将屏幕截图（Bitblt）存储在内存缓冲区中以通过IdTCPClient进行发送 [英] Store a screen capture (Bitblt) in a memory buffer to send over IdTCPClient

问题描述

  Graphics :: TBitmap * bmpscreencapture = new Graphics :: TBitmap; 
 bmpscreencapture-> Height = Screen->高度; 
 bmpscreencapture->宽度=屏幕 - >宽度; 
 HDC ScreenSrc = GetWindowDC（0）; 
 BitBlt（bmpscreencapture-> Canvas-> Handle，0,0，Screen-> Width，
 Screen-> Height，ScreenSrc，0,0，SRCCOPY）; 
 Canvas-> Draw（10，10，bmpscreencapture）; 
 ReleaseDC（GetDesktopWindow（），ScreenSrc）; 
删除bmpscreencapture; 
  

我目前有一段代码用于捕获屏幕并将屏幕截图显示到空白表单上。我想要做的是将捕获的图像存储到内存缓冲区中，然后使用indy客户端IdTCPClient通过互联网发送此缓冲区，以便通过类似程序使用indy服务器IDTCPServer接收。

有没有人有任何建议/想法如何做到这一点？我对图形编程相当陌生

解决方案使用TBitmap :: SaveToStream（）方法将数据保存到TStream中，例如作为TMemoryStream。然后将TStream传递给Indy的TIdTCPConnection :: WriteStream（）（Indy 9及更早版本）或TIdIOHandler :: Write（TStream）（Indy 10）方法。在接收端，然后可以使用TIdTCPConnection / TIdIOHandler :: ReadStream（）方法将数据读入TStream，然后将TStream传递给TBitmap :: LoadFromStream（）方法。

In c++ builder 6 on windows vista ...

Graphics:: TBitmap * bmpscreencapture = new Graphics::TBitmap;
bmpscreencapture-> Height = Screen-> Height;
bmpscreencapture-> Width = Screen-> Width;
HDC ScreenSrc = GetWindowDC (0);
BitBlt (bmpscreencapture-> Canvas-> Handle, 0, 0, Screen-> Width,
Screen-> Height, ScreenSrc, 0, 0, SRCCOPY);
Canvas->Draw(10, 10, bmpscreencapture);
ReleaseDC (GetDesktopWindow (), ScreenSrc);
delete bmpscreencapture;

I currently have a section of code for capturing the screen and displaying the screen capture onto an empty form. What I would like to do is store the captured image into a memory buffer and then send this buffer over the internet using the indy client IdTCPClient to be received by a similar program using indy server IDTCPServer.

Has anyone got any suggestions/ideas of how to accomplish this?? I am fairly new to graphics programming

解决方案

Use the TBitmap::SaveToStream() method to save the data to a TStream, such as a TMemoryStream. Then pass the TStream to Indy's TIdTCPConnection::WriteStream() (Indy 9 and earlier) or TIdIOHandler::Write(TStream) (Indy 10) method. On the recieving end, you can then use the TIdTCPConnection/TIdIOHandler::ReadStream() method to read the data into a TStream, and then pass the TStream to the TBitmap::LoadFromStream() method.

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