Wednesday, January 4, 2023

Re: Is it possible to use the new Clipboard API in a GWT app? It depends on document.hasFocus being true.

I can't see enough of your code to work out what you're doing.

At a guess, you just need to do:

public void pasteDataIntoGrid(BaseEditorGridPanel grid, BaseGridRecordDef recordDef, Loaded<Boolean> pasteResult) {
  readText(text -> {
    // Stick the text into your grid here
    
    // As it's now an async call, you can't return a success/fail straight away, so we do a callback instead
    pasteResult.data(true);
  });
}

On Wednesday, 4 January 2023 at 5:52:25 pm UTC+11 patil.p...@gmail.com wrote:
I tried all things, below is the actual flow of code where I need clipboard copied text, upon click on tool icon below function gets called,
protected Function pasteFromExcelFunction =new Function(){      public void execute(){       if(readOnly){       return;       }// its false      try{           if(pasteFromExcelHelper.pasteDataIntoGrid(BaseEditorGridPanel.this, getRecordDef()));             doAfterPaste();     }      }    }          public boolean pasteDataIntoGrid(BaseEditorGridPanel grid, BaseGridRecordDef recordDef)      {        boolean pasteSuccessful=true;        String pastedText= readFromClipboard(); 
     // pastedText is further adjusted as per the grid-all java code       }          private String readFromClipboard (){      return JavaScriptUtils.getClipboardData();     }    public static native String getClipboardData()/*-{
// I want modern clipboard api to return string      if($wnd.clipboardData && clipboardData.setData){      return $wnd.clipboardData.getData('Text');  }-*/;  

So with respect to above method i.e. getClipboardData , which returns string , this works fine with IE but not with modern browser, so I tried new clipboard api but i cant return string. Could you please guide me with repect to above code, its been while I am struggling !!


On Wed, Jan 4, 2023 at 11:28 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:
?  That is the Java code.

readTextButton.addClickHandler(event -> {
  readText(text -> {
    // Do whatever you want with the text, eg:
    GWT.log("The text: " + text);
  });
});

(assuming you are running Java8 or later)

The readText is your JSNI call.

On Wednesday, 4 January 2023 at 1:18:31 pm UTC+11 patil.p...@gmail.com wrote:
I am not sure if I can call Java code
readText(text -> {
   // Do whatever you want with the text, eg:
   GWT.log("The text: " + text);// can I call Java code here to process this string?
});

On Wed, 4 Jan 2023, 4:00 am Craig Mitchell, <ma...@craig-mitchell.com> wrote:
readText(text -> {
   // Do whatever you want with the text, eg:
   GWT.log("The text: " + text);
});

Note:  It is returned asynchronously (not from the return statement), so you'll probably need to modify your calling code to cater for that.

On Wednesday, 4 January 2023 at 3:40:05 am UTC+11 patil.p...@gmail.com wrote:
Hi @Craig Mitchell,
You were right about script,
The above script posted by me seems to have issues, below is the working script, I am not getting any compiler errors but neither getting any string as return value. 
I am testing things using below code, 
readTextButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event){
//Goal is to receive copied value on readText() function call.
String str =readText(null)// 1. What should I pass as argument over here-I know null argument is not correct, My apologies as I am not well versed with async         //callbacks
}
});


public static native String readText(Loaded<String> clipboardText)/*-{
try{
if($wnd.navigator.clipboard){
       var promise=$wnd.navigator.clipboard.readText();
        var resolve= function(text){
        console.log(txt);  //2.Here I can see copied text in console
       clipboardText.@com.mypackage.Loaded::data(*)(text);
};
 var reject=function(reason){
  console.log('$wnd.navigator.clipboard.readText failed: + reason'); //3.Getting cannot read properties of null

};
promise["catch"](reject);
promise.then(resolve,reject)["catch"](reject);

}

}
catch(e){}
}-*/;




On Fri, Dec 30, 2022 at 10:53 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:
As it's doing it asynchronously, you'll need to add a callback to return the string.

Something like this:

---

package mypackage;

public interface Loaded<T> {
    public void data(T data);
}

---

public static native String readText(Loaded<String> clipboardText) /*-{
    try {
        var promise = $wnd.navigator.clipboard.readText();
        var resolve = function(text) {
        console.log(text);// I can print text here but not able to return it as String
        clipboardText.@mypackage.Loaded::data(*)(text);
    }
    catch (e){
      //futher code goes here
    }
}-*/;

---

Note:  I'm just copying your JavaScript, it doesn't look correct to me, I think you also need:

promise.then(resolve);

or something like that.

On Friday, 30 December 2022 at 2:30:14 pm UTC+11 patil.p...@gmail.com wrote:
Yes, it's working but not working with GWT, I think the async function and await keyword is not supported with GWT, was getting a compiler error, I tried below code which worked, but not able to return as String, can print the copied text with console.log(text). As of now I didn't get any solution, I tried to search on the internet but had no luck.

is there any library or anything to be included/imported to get async/await support with GWT?
public static native String readText()/*-{     try       {        var promise = $wnd.navigator.clipboard.readText();        var resolve = function(text){        console.log(text);// I can print text here but not able to return it as String        }        catch (e){        //futher code goes here        }       }-*/;

On Fri, Dec 30, 2022 at 8:04 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:
Apologies.  That stackoverflow example gets blocked due to cross origin.

Just ran a simple test:

<html>
<script>
async function readClipboard () {
  if (!navigator.clipboard) {
    // Clipboard API not available
    return
  }
  try {
    const text = await navigator.clipboard.readText();
    document.querySelector('.clipboard-content').innerText = text;
  } catch (err) {
    console.error('Failed to copy!', err)
  }
}

function updateClipboard() {
  // Here You Can Debug without DomException
  debugger
  const clipboard = document.querySelector('.clipboard-content').innerText;
  document.querySelector('.clipboard-content').innerText = 'Updated => ' + clipboard;
}
</script>

<body>
<button onclick="readClipboard()">Paste</button>
<p class="clipboard-content"></p>
<button onclick="updateClipboard()">Edit</button>
</body>
</html>

and it worked fine (browser popped up a message asking for permission).

On Thursday, 29 December 2022 at 5:02:34 pm UTC+11 Craig Mitchell wrote:
Browsers now need you to get your users to grant permissions in their browsers for this to work.  See "Permissions API" here: https://developer.mozilla.org/en-US/docs/Web/API/Clipboard/readText#security 

An example:  https://stackoverflow.com/a/59954231/418057  When I run the code snippet, and press "paste", it give "NotAllowedError".

On Monday, 26 December 2022 at 5:02:32 pm UTC+11 patil.p...@gmail.com wrote:
Hi Experts,
I am newbie with javascript and GWT, I want my function to return clipboard data,for further use in application upon click of(tool button).
Is there any way to get the text read from clipboard, I am looking something similar @Jim Douglas mentioned, with $wnd.navigator.clipboard.readText() is working but I need the "pasted" text to be returned to my native method call 

public static native String readText(){
try{
   if($wnd.navigator.clipboard){
      var promise= $wnd.navigator.clipboard.readText();
      var resolve =function(text){
      console.log(text);   // i want this text which i can see on console(string)  to be returned , Is it possible and how to achieve it any hack to ge
    }
  }
}
}

Please help, as i got stuck at this point for a while. Thanks.
On Wednesday, 16 October 2019 at 19:53:27 UTC+5:30 Jim Douglas wrote:
Oh wow, I completely missed that. Of course navigator is really window.navigator. JavaScript sample code almost always references navigator, not window.navigator, and I rarely think of that detail. Even after staring at that code for hours looking for something I might have missed, that never occurred to me. Thanks, Thomas; that's exactly what I was missing. With that simple change, this now works.


On Wednesday, October 16, 2019 at 5:44:05 AM UTC-7, Thomas Broyer wrote:
Have you tried with $wnd.navigator.clipboard?

On Tuesday, October 15, 2019 at 10:40:04 PM UTC+2, Jim Douglas wrote:
Ok, there are a few moving parts to this. Keeping it as short as possible, this is the new Clipboard API:


Support is extremely limited at the moment, but for now I'd be happy to get something working in Chrome:


Here's Google's live sample page:


For obvious reasons, there's a lot of paranoid security around JavaScript access to the clipboard. This is the specific detail I'm running into:


These APIs throw a security exception if document.hasFocus() is false. And I'm not seeing any way to honour that rule in a GWT app. In my production app, and in a tiny standalone GWT app I just generated for testing purposes, document.hasFocus() is always false ($doc.hasFocus() is true).

For testing purposes, I generated the GWT StockWatcher demo app:


Then I added some UI hooks for clipboard testing elements in StockWatcher.html:

    <h1>Web Application Starter Project</h1>


    <table align="center">

      <tr>

        <td colspan="2" style="font-weight:bold;">Please enter your name:</td>        

      </tr>

      <tr>

        <td id="nameFieldContainer"></td>

        <td id="sendButtonContainer"></td>

      </tr>

      <tr>

        <td colspan="2" style="color:red;" id="errorLabelContainer"></td>

      </tr>

      <tr>

        <td id="readTextField"></td>

        <td id="readTextButton"></td>

      </tr>      

      <tr>

        <td id="writeTextField"></td>

        <td id="writeTextButton"></td>

      </tr>

    </table>


And minimal testing UI in StockWatcher.java onModuleLoad:

        TextBox readText = new TextBox();

        readText.setText("readText");

        Button readTextButton = new Button("readText");


        TextBox writeText = new TextBox();

        writeText.setText("writeText");

        Button writeTextButton = new Button("writeText");

        

        RootPanel.get("readTextField").add(readText);

        RootPanel.get("readTextButton").add(readTextButton);

        

        RootPanel.get("writeTextField").add(writeText);

        RootPanel.get("writeTextButton").add(writeTextButton);


        readTextButton.addClickHandler(new ClickHandler()

        {

            public void onClick(ClickEvent event)

            {

                readText();

            }

        });

        

        writeTextButton.addClickHandler(new ClickHandler()

        {

            public void onClick(ClickEvent event)

            {

                writeText(writeText.getText());

            }

        });


And corresponding JSNI functions to attempt to invoke the Clipboard API:

   

    public native void readText()

    /*-{

        try

        {

            if (navigator.clipboard)

            {

                console.log('navigator.clipboard.readText()');

                console.log('document.hasFocus()='+document.hasFocus());

                console.log('$doc.hasFocus()='+$doc.hasFocus());

                var promise = navigator.clipboard.readText();

                var resolve = function(text) {

                    console.log(text);

                };

                var reject = function(reason) {

                    console.log('navigator.clipboard.readText failed: '+reason);

                };

                promise["catch"](reject);

                promise.then(resolve,reject)["catch"](reject);

            }

            else

            {

                console.log('This browser does not support navigator.clipboard.');

            }

        }

        catch (e)

        {

            console.error(e,e.stack);

        }

    }-*/;

    


    public native void writeText(String p_text)

    /*-{

        try

        {

            var _this = this;

            if (navigator.clipboard)

            {

                console.log('navigator.clipboard.writeText()');

                console.log('document.hasFocus()='+document.hasFocus());

                console.log('$doc.hasFocus()='+$doc.hasFocus());

                var promise = navigator.clipboard.writeText(p_text);

                var resolve = function(text) {

                    console.log('navigator.clipboard.writeText '+text);

                };

                var reject = function(reason) {

                    console.log('navigator.clipboard.writeText failed: '+reason);

                };

                promise["catch"](reject);

                promise.then(resolve,reject)["catch"](reject);

            }

            else

            {

                console.log('This browser does not support navigator.clipboard.');

            }

        }

        catch (e)

        {

            console.error(e,e.stack);

        }

    }-*/;


And I'm stuck on the same security error noted in that StackOverflow question, but with no obvious way to satisfy that requirement:

navigator.clipboard.readText()

document.hasFocus()=false

$doc.hasFocus()=true

navigator.clipboard.readText failed: NotAllowedError: Document is not focused.


navigator.clipboard.writeText()

document.hasFocus()=false

$doc.hasFocus()=true

navigator.clipboard.writeText failed: NotAllowedError: Document is not focused.



Is there any way to make this work in GWT?

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 Pramod Patil
 Contact +91-8975432800

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 Pramod Patil
 Contact +91-8975432800

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 Contact +91-8975432800

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Tuesday, January 3, 2023

Re: Is it possible to use the new Clipboard API in a GWT app? It depends on document.hasFocus being true.

I tried all things, below is the actual flow of code where I need clipboard copied text, upon click on tool icon below function gets called,
protected Function pasteFromExcelFunction =new Function(){      public void execute(){       if(readOnly){       return;       }// its false      try{           if(pasteFromExcelHelper.pasteDataIntoGrid(BaseEditorGridPanel.this, getRecordDef()));             doAfterPaste();     }      }    }          public boolean pasteDataIntoGrid(BaseEditorGridPanel grid, BaseGridRecordDef recordDef)      {        boolean pasteSuccessful=true;        String pastedText= readFromClipboard(); 
     // pastedText is further adjusted as per the grid-all java code       }          private String readFromClipboard (){      return JavaScriptUtils.getClipboardData();     }    public static native String getClipboardData()/*-{
// I want modern clipboard api to return string      if($wnd.clipboardData && clipboardData.setData){      return $wnd.clipboardData.getData('Text');  }-*/;  

So with respect to above method i.e. getClipboardData , which returns string , this works fine with IE but not with modern browser, so I tried new clipboard api but i cant return string. Could you please guide me with repect to above code, its been while I am struggling !!

On Wed, Jan 4, 2023 at 11:28 AM Craig Mitchell <mail@craig-mitchell.com> wrote:
?  That is the Java code.

readTextButton.addClickHandler(event -> {
  readText(text -> {
    // Do whatever you want with the text, eg:
    GWT.log("The text: " + text);
  });
});

(assuming you are running Java8 or later)

The readText is your JSNI call.

On Wednesday, 4 January 2023 at 1:18:31 pm UTC+11 patil.p...@gmail.com wrote:
I am not sure if I can call Java code
readText(text -> {
   // Do whatever you want with the text, eg:
   GWT.log("The text: " + text);// can I call Java code here to process this string?
});

On Wed, 4 Jan 2023, 4:00 am Craig Mitchell, <ma...@craig-mitchell.com> wrote:
readText(text -> {
   // Do whatever you want with the text, eg:
   GWT.log("The text: " + text);
});

Note:  It is returned asynchronously (not from the return statement), so you'll probably need to modify your calling code to cater for that.

On Wednesday, 4 January 2023 at 3:40:05 am UTC+11 patil.p...@gmail.com wrote:
Hi @Craig Mitchell,
You were right about script,
The above script posted by me seems to have issues, below is the working script, I am not getting any compiler errors but neither getting any string as return value. 
I am testing things using below code, 
readTextButton.addClickHandler(new ClickHandler(){
public void onClick(ClickEvent event){
//Goal is to receive copied value on readText() function call.
String str =readText(null)// 1. What should I pass as argument over here-I know null argument is not correct, My apologies as I am not well versed with async         //callbacks
}
});


public static native String readText(Loaded<String> clipboardText)/*-{
try{
if($wnd.navigator.clipboard){
       var promise=$wnd.navigator.clipboard.readText();
        var resolve= function(text){
        console.log(txt);  //2.Here I can see copied text in console
       clipboardText.@com.mypackage.Loaded::data(*)(text);
};
 var reject=function(reason){
  console.log('$wnd.navigator.clipboard.readText failed: + reason'); //3.Getting cannot read properties of null

};
promise["catch"](reject);
promise.then(resolve,reject)["catch"](reject);

}

}
catch(e){}
}-*/;




On Fri, Dec 30, 2022 at 10:53 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:
As it's doing it asynchronously, you'll need to add a callback to return the string.

Something like this:

---

package mypackage;

public interface Loaded<T> {
    public void data(T data);
}

---

public static native String readText(Loaded<String> clipboardText) /*-{
    try {
        var promise = $wnd.navigator.clipboard.readText();
        var resolve = function(text) {
        console.log(text);// I can print text here but not able to return it as String
        clipboardText.@mypackage.Loaded::data(*)(text);
    }
    catch (e){
      //futher code goes here
    }
}-*/;

---

Note:  I'm just copying your JavaScript, it doesn't look correct to me, I think you also need:

promise.then(resolve);

or something like that.

On Friday, 30 December 2022 at 2:30:14 pm UTC+11 patil.p...@gmail.com wrote:
Yes, it's working but not working with GWT, I think the async function and await keyword is not supported with GWT, was getting a compiler error, I tried below code which worked, but not able to return as String, can print the copied text with console.log(text). As of now I didn't get any solution, I tried to search on the internet but had no luck.

is there any library or anything to be included/imported to get async/await support with GWT?
public static native String readText()/*-{     try       {        var promise = $wnd.navigator.clipboard.readText();        var resolve = function(text){        console.log(text);// I can print text here but not able to return it as String        }        catch (e){        //futher code goes here        }       }-*/;

On Fri, Dec 30, 2022 at 8:04 AM Craig Mitchell <ma...@craig-mitchell.com> wrote:
Apologies.  That stackoverflow example gets blocked due to cross origin.

Just ran a simple test:

<html>
<script>
async function readClipboard () {
  if (!navigator.clipboard) {
    // Clipboard API not available
    return
  }
  try {
    const text = await navigator.clipboard.readText();
    document.querySelector('.clipboard-content').innerText = text;
  } catch (err) {
    console.error('Failed to copy!', err)
  }
}

function updateClipboard() {
  // Here You Can Debug without DomException
  debugger
  const clipboard = document.querySelector('.clipboard-content').innerText;
  document.querySelector('.clipboard-content').innerText = 'Updated => ' + clipboard;
}
</script>

<body>
<button onclick="readClipboard()">Paste</button>
<p class="clipboard-content"></p>
<button onclick="updateClipboard()">Edit</button>
</body>
</html>

and it worked fine (browser popped up a message asking for permission).

On Thursday, 29 December 2022 at 5:02:34 pm UTC+11 Craig Mitchell wrote:
Browsers now need you to get your users to grant permissions in their browsers for this to work.  See "Permissions API" here: https://developer.mozilla.org/en-US/docs/Web/API/Clipboard/readText#security 

An example:  https://stackoverflow.com/a/59954231/418057  When I run the code snippet, and press "paste", it give "NotAllowedError".

On Monday, 26 December 2022 at 5:02:32 pm UTC+11 patil.p...@gmail.com wrote:
Hi Experts,
I am newbie with javascript and GWT, I want my function to return clipboard data,for further use in application upon click of(tool button).
Is there any way to get the text read from clipboard, I am looking something similar @Jim Douglas mentioned, with $wnd.navigator.clipboard.readText() is working but I need the "pasted" text to be returned to my native method call 

public static native String readText(){
try{
   if($wnd.navigator.clipboard){
      var promise= $wnd.navigator.clipboard.readText();
      var resolve =function(text){
      console.log(text);   // i want this text which i can see on console(string)  to be returned , Is it possible and how to achieve it any hack to ge
    }
  }
}
}

Please help, as i got stuck at this point for a while. Thanks.
On Wednesday, 16 October 2019 at 19:53:27 UTC+5:30 Jim Douglas wrote:
Oh wow, I completely missed that. Of course navigator is really window.navigator. JavaScript sample code almost always references navigator, not window.navigator, and I rarely think of that detail. Even after staring at that code for hours looking for something I might have missed, that never occurred to me. Thanks, Thomas; that's exactly what I was missing. With that simple change, this now works.


On Wednesday, October 16, 2019 at 5:44:05 AM UTC-7, Thomas Broyer wrote:
Have you tried with $wnd.navigator.clipboard?

On Tuesday, October 15, 2019 at 10:40:04 PM UTC+2, Jim Douglas wrote:
Ok, there are a few moving parts to this. Keeping it as short as possible, this is the new Clipboard API:


Support is extremely limited at the moment, but for now I'd be happy to get something working in Chrome:


Here's Google's live sample page:


For obvious reasons, there's a lot of paranoid security around JavaScript access to the clipboard. This is the specific detail I'm running into:


These APIs throw a security exception if document.hasFocus() is false. And I'm not seeing any way to honour that rule in a GWT app. In my production app, and in a tiny standalone GWT app I just generated for testing purposes, document.hasFocus() is always false ($doc.hasFocus() is true).

For testing purposes, I generated the GWT StockWatcher demo app:


Then I added some UI hooks for clipboard testing elements in StockWatcher.html:

    <h1>Web Application Starter Project</h1>


    <table align="center">

      <tr>

        <td colspan="2" style="font-weight:bold;">Please enter your name:</td>        

      </tr>

      <tr>

        <td id="nameFieldContainer"></td>

        <td id="sendButtonContainer"></td>

      </tr>

      <tr>

        <td colspan="2" style="color:red;" id="errorLabelContainer"></td>

      </tr>

      <tr>

        <td id="readTextField"></td>

        <td id="readTextButton"></td>

      </tr>      

      <tr>

        <td id="writeTextField"></td>

        <td id="writeTextButton"></td>

      </tr>

    </table>


And minimal testing UI in StockWatcher.java onModuleLoad:

        TextBox readText = new TextBox();

        readText.setText("readText");

        Button readTextButton = new Button("readText");


        TextBox writeText = new TextBox();

        writeText.setText("writeText");

        Button writeTextButton = new Button("writeText");

        

        RootPanel.get("readTextField").add(readText);

        RootPanel.get("readTextButton").add(readTextButton);

        

        RootPanel.get("writeTextField").add(writeText);

        RootPanel.get("writeTextButton").add(writeTextButton);


        readTextButton.addClickHandler(new ClickHandler()

        {

            public void onClick(ClickEvent event)

            {

                readText();

            }

        });

        

        writeTextButton.addClickHandler(new ClickHandler()

        {

            public void onClick(ClickEvent event)

            {

                writeText(writeText.getText());

            }

        });


And corresponding JSNI functions to attempt to invoke the Clipboard API:

   

    public native void readText()

    /*-{

        try

        {

            if (navigator.clipboard)

            {

                console.log('navigator.clipboard.readText()');

                console.log('document.hasFocus()='+document.hasFocus());

                console.log('$doc.hasFocus()='+$doc.hasFocus());

                var promise = navigator.clipboard.readText();

                var resolve = function(text) {

                    console.log(text);

                };

                var reject = function(reason) {

                    console.log('navigator.clipboard.readText failed: '+reason);

                };

                promise["catch"](reject);

                promise.then(resolve,reject)["catch"](reject);

            }

            else

            {

                console.log('This browser does not support navigator.clipboard.');

            }

        }

        catch (e)

        {

            console.error(e,e.stack);

        }

    }-*/;

    


    public native void writeText(String p_text)

    /*-{

        try

        {

            var _this = this;

            if (navigator.clipboard)

            {

                console.log('navigator.clipboard.writeText()');

                console.log('document.hasFocus()='+document.hasFocus());

                console.log('$doc.hasFocus()='+$doc.hasFocus());

                var promise = navigator.clipboard.writeText(p_text);

                var resolve = function(text) {

                    console.log('navigator.clipboard.writeText '+text);

                };

                var reject = function(reason) {

                    console.log('navigator.clipboard.writeText failed: '+reason);

                };

                promise["catch"](reject);

                promise.then(resolve,reject)["catch"](reject);

            }

            else

            {

                console.log('This browser does not support navigator.clipboard.');

            }

        }

        catch (e)

        {

            console.error(e,e.stack);

        }

    }-*/;


And I'm stuck on the same security error noted in that StackOverflow question, but with no obvious way to satisfy that requirement:

navigator.clipboard.readText()

document.hasFocus()=false

$doc.hasFocus()=true

navigator.clipboard.readText failed: NotAllowedError: Document is not focused.


navigator.clipboard.writeText()

document.hasFocus()=false

$doc.hasFocus()=true

navigator.clipboard.writeText failed: NotAllowedError: Document is not focused.



Is there any way to make this work in GWT?

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Thanks and regards,
 Pramod Patil
 Contact +91-8975432800

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 Pramod Patil
 Contact +91-8975432800

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Thanks and regards,
 Pramod Patil
 Contact +91-8975432800

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