How to make SnapShot

[ForestListener]

Hello.

Is there way to get snapshot when application form with Chromium is not visible?

I've tried built in TakeSnapshot, but it works only when Chromium is on screen.

I need it to get Captha images, because built in downloadimage downloads a new captcha (but i need to use current, opened in Webbrowser captcha image).

Thank you!

[salvadordf]

Try the "Take screenshot" menu option in the MiniBrowser demo.
https://github.com/salvadordf/CEF4Delph ... .pas#L1111

[Student]

I think, in this case, it is better to use the event GetResourceResponseFilter, to save a captcha while loading on the fly.
Learn the demo ResponseFilterBrowser, It shows how to save resources in TMemoryStream, and there you can do whatever you want with them.

[ForestListener]

Thank you!

[w1ld32]

I think, in this case, it is better to use the event GetResourceResponseFilter, to save a captcha while loading on the fly.
Learn the demo ResponseFilterBrowser, It shows how to save resources in TMemoryStream, and there you can do whatever you want with them.

Sorry, I can't figure out this example, if it's not difficult, show the code how to save logo.png which is in the example without replacing it?

[salvadordf]

I think, in this case, it is better to use the event GetResourceResponseFilter, to save a captcha while loading on the fly.
Learn the demo ResponseFilterBrowser, It shows how to save resources in TMemoryStream, and there you can do whatever you want with them.

Sorry, I can't figure out this example, if it's not difficult, show the code how to save logo.png which is in the example without replacing it?

All the code is in the ResponseFilterBrowser demo but it's not simple.
If you know the URL of the image consider using TChromium.DownloadImage instead.

[w1ld32]

I think, in this case, it is better to use the event GetResourceResponseFilter, to save a captcha while loading on the fly.
Learn the demo ResponseFilterBrowser, It shows how to save resources in TMemoryStream, and there you can do whatever you want with them.

Sorry, I can't figure out this example, if it's not difficult, show the code how to save logo.png which is in the example without replacing it?

All the code is in the ResponseFilterBrowser demo but it's not simple.
If you know the URL of the image consider using TChromium.DownloadImage instead.

The picture changes every time ((
https://instagram777.ru/captcha2.php

[w1ld32]

I got out of the situation like this: after loading the page, I find the coordinates of the captcha, take a screenshot and cut out the captcha using these coordinates.

[Student]

I got out of the situation like this: after loading the page, I find the coordinates of the captcha, take a screenshot and cut out the captcha using these coordinates.

You need to make changes to the ReplaceLogo procedure, and then in FStream your resource will be located. I can't guarantee that my code is written correctly,
some types of resources may be of unknown size, and I have additional checks in the code.

Code: Select all

  FStreamCS.Acquire;

  if (data_in = nil) then
  begin
    data_in_read := 0;
    data_out_written := 0;
    if FRscCompleted and ((FRscSize = -1) or (FRscSize = FStream.size)) then
    begin
      aResult := RESPONSE_FILTER_DONE;
      PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0);
    end else aResult := RESPONSE_FILTER_NEED_MORE_DATA;
  end
  else
  begin
    aResult := RESPONSE_FILTER_DONE;

    if (data_out <> nil) then
    begin
      data_out_written := min(data_in_size, data_out_size);

      if (data_out_written > 0) then
        Move(data_in^, data_out^, data_out_written);
    end;

    if (data_in_size > 0) then
      data_in_read := FStream.Write(data_in^, data_in_size);

    if not(FRscCompleted) and (FRscSize <> -1) and (FRscSize = FStream.size)
    then
     FRscCompleted := PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0)
    else if data_out_written = 65536 then
      aResult := RESPONSE_FILTER_NEED_MORE_DATA
    else
     FRscCompleted := PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0);
  end;

  FStreamCS.Release;

[w1ld32]

I got out of the situation like this: after loading the page, I find the coordinates of the captcha, take a screenshot and cut out the captcha using these coordinates.

You need to make changes to the ReplaceLogo procedure, and then in FStream your resource will be located. I can't guarantee that my code is written correctly,
some types of resources may be of unknown size, and I have additional checks in the code.

Code: Select all

  FStreamCS.Acquire;

  if (data_in = nil) then
  begin
    data_in_read := 0;
    data_out_written := 0;
    if FRscCompleted and ((FRscSize = -1) or (FRscSize = FStream.size)) then
    begin
      aResult := RESPONSE_FILTER_DONE;
      PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0);
    end else aResult := RESPONSE_FILTER_NEED_MORE_DATA;
  end
  else
  begin
    aResult := RESPONSE_FILTER_DONE;

    if (data_out <> nil) then
    begin
      data_out_written := min(data_in_size, data_out_size);

      if (data_out_written > 0) then
        Move(data_in^, data_out^, data_out_written);
    end;

    if (data_in_size > 0) then
      data_in_read := FStream.Write(data_in^, data_in_size);

    if not(FRscCompleted) and (FRscSize <> -1) and (FRscSize = FStream.size)
    then
     FRscCompleted := PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0)
    else if data_out_written = 65536 then
      aResult := RESPONSE_FILTER_NEED_MORE_DATA
    else
     FRscCompleted := PostMessage(handle, STREAM_COPY_COMPLETE, 0, 0);
  end;

  FStreamCS.Release;

Thank You. I Try it.