有关WM_COPYDATA的帮助 [英] Help with WM_COPYDATA

问题描述

大家好，我正准备使用wm_copydata在2个应用程序之间进行通信.

我不确定如何使用COPYDTASTRUCT通过HWND.

Hello all, I am tring to communicate between 2 applications using wm_copydata.

I am not sure how to pass HWND using COPYDTASTRUCT.

HWND hWnd = FindWindow(NULL, "Advisor");
	if (hWnd)
	{
/////Sending Application.
		COPYDATASTRUCT cds;
		ZeroMemory(&cds, sizeof(COPYDATASTRUCT));
		cds.dwData = WM_CREATE;
		cds.lpData = (HWND)ResulthWnd;
		cds.cbData = sizeof(ResulthWnd);
		SendMessage(hWnd,WM_COPYDATA,(WPARAM)ResulthWnd,(LPARAM)&cds);
         }

////////Receiving Application
switch (pCopyDataStruct->dwData)
	{
	case WM_CREATE:
         HWND SenderWnd = (HWND)pCopyDataStruct->lpData;
break;
         }

有人可以帮忙吗?

在此先感谢.

Can someone please help.

Thanks in advance.

推荐答案

成员cds.lpData应该是指针(LPARAM)&ResultWnd(请修正世界结果"中的拼写错误)，而不是.

我想指出的是，在两个不同进程之间交换数据是什至在NT技术之前创建的传统Windows API的产物，而不是主流的OS功能.实际的多进程系统中的进程应该是隔离的，并且只能通过IPC(例如套接字)进行通信.因此，WM_COPYDATA既不安全也不可靠.您需要对此做出谨慎的决定，并考虑其他选择.这种方法表面上的简单性可能非常诱人.

另请参见:
http://www.flounder.com/wm_copydata.htm [使用WM_COPYDATA在.NET和MFC之间进行进程间通信 [ ^ ].

—SA

The member cds.lpData should be a pointer, (LPARAM)&ResultWnd (please fix the typo in the world "Result"), not HWND.

I would like to note, that exchanging data between two different processes is the artifact of the legacy Windows API created even before NT technology and is not a mainstream OS feature. The processes in real multi-process systems are supposed to be isolated and communicating only via IPC, such as sockets. So, WM_COPYDATA is neither safe not robust. You need to make a careful decision about it and consider alternative. The apparent simplicity of the approach could be very deceiving.

See also:
http://www.flounder.com/wm_copydata.htm[^],
Interprocess Communication Between .NET and MFC Using WM_COPYDATA[^].

—SA

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