使用PrintWindow API捕获用户区域 [英] Capture user area with PrintWindow API

问题描述

您好..



我有一个窗口句柄（hwnd）。我想截取这个窗口的截图，我已经使用了PrintWindow这样：

Hello..

Am having a window handle(hwnd). I want to take Screenshot of this window, I have used PrintWindow for this like this:

void Screenshot()
{
  CImage image;
  image.Create(imageWidth, imageHeight, 24);
  CImageDC imageDC(image);

  HWND hwnd = ::FindWindow(0,"MyWindow");

  PrintWindow(hwnd, imageDC, PW_CLIENTONLY);

  image.Save("H:\\Image.bmp",ImageFormatBMP);
}

使用此代码，我在H：\\ drive中获取指定的窗口图像。现在我的问题是：我如何使用用户指定的区域截取MyWindow的屏幕截图，即通过指定x轴和& y轴。我的意思是，我不想要MyWindow的整个图像，我只需要指定MyWindow的区域，即MyWindow中间的某个区域。

所以我如何指定x& y坐标到PrintWindow。另外。我试过BitBlt& StretchBlt但它们比PrintWindow慢。

请有人知道如何完成这个。



谢谢大家：）

With this code i get the specified window image in H:\\ drive. Now my question is : How do i take a screenshot of MyWindow with user specified area i.e., by specifying x-axis & y-axis. I mean, i don''t want the entire image of MyWindow, I need only specified area of MyWindow i.e., Somewhere in the middle of MyWindow.
So How do i specify x & y coordinates to PrintWindow. Alternatively. i have tried with BitBlt & StretchBlt but they are relatively slower than PrintWindow.
Please someone can tell how to accomplish this.

Thank you all :)

推荐答案

您需要编写自己的代码来处理 WM_PRINT 消息 [ ^ ]。

You would need to write your own code to handle the WM_PRINT message[^].

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