又是SendMessage问题。。。

[Eddie780]

跨进程SendMessage，UNICODE环境
【方法一】发送端代码能操作SETTEXT消息，说明发送端代码是对的，但是接收的时候崩溃
发送端：

::SendMessage(testHwnd, WM_mymessage1, 0, (LPARAM)(strHello.GetBuffer()))

接收端：

CString cs = (LPWSTR)(lParam);

【方法二】网上复制的代码，接收时程序依然崩溃
发送端：

CString strHello = "Hello!";
::SendMessage(ttestHwnd,WM_mymessage1,0 ,*(LPARAM*)&strHello);

接收端：

CString cs = *(CString*)(LPARAM*)&l;

好像方法二只能自身进程里，传的是指针。为什么方法一也崩溃呢？是不是UNICODE环境下的转换出了问题？

[dong364]

不要使用自定义消息，得使用WM_COPYDATA，msdn上有example： Using Data Copy -------------------------------------------------------------------------------- The following example demonstrates how to send information between two applications using the WM_COPYDATA message. The sending application displays a dialog box to the user which requests certain information. The application packages the information into a private data structure, includes a pointer to the structure in the COPYDATASTRUCT structure, and sends the information to the receiving application using the WM_COPYDATA message. The receiving application has a hidden window with the class name Disp32Class. Hide Example // ************ Globals ************ // #define MYDISPLAY 1 typedef struct tagMYREC { char s1[80]; char s2[80]; DWORD n; } MYREC; COPYDATASTRUCT MyCDS; MYREC MyRec; HRESULT hResult; BOOL CALLBACK InfoDlgProc( HWND, UINT, WPARAM, LPARAM ); // ************ Code fragment **************** // Get data from user. InfoDlgProc stores the information in MyRec. // DialogBox( ghInstance, "InfoDlg", hWnd, (DLGPROC) InfoDlgProc ); // // Copy data into structure to be passed via WM_COPYDATA. // Also, we assume that truncation of the data is acceptable. // hResult = StringCbCopy( MyRec.s1, sizeof(MyRec.s1), szFirstName ); if (hResult != S_OK) return False; hResult = StringCbCopy( MyRec.s2, sizeof(MyRec.s2), szLastName ); if (hResult != S_OK) return False; MyRec.n = nAge; // // Fill the COPYDATA structure // MyCDS.dwData = MYPRINT; // function identifier MyCDS.cbData = sizeof( MyRec ); // size of data MyCDS.lpData = &MyRec; // data structure // // Call function, passing data in &MyCDS // hwDispatch = FindWindow( "Disp32Class", "Hidden Window" ); if( hwDispatch != NULL ) SendMessage( hwDispatch, WM_COPYDATA, (WPARAM)(HWND) hWnd, (LPARAM) (LPVOID) &MyCDS ); else MessageBox( hWnd, "Can't send WM_COPYDATA", "MyApp", MB_OK ); The receiving application has a hidden window which receives the information from WM_COPYDATA and displays it to the user. Hide Example // ************ Globals ************ // #define MYDISPLAY 1 typedef struct tagMYREC { char s1[80]; char s2[80]; DWORD n; } MYREC; PCOPYDATASTRUCT pMyCDS; void WINAPI MyDisplay( LPSTR, LPSTR, DWORD ); // // ************ Code fragment **************** // case WM_COPYDATA: pMyCDS = (PCOPYDATASTRUCT) lParam; switch( pMyCDS->dwData ) { case MYDISPLAY: MyDisplay( (LPSTR) ((MYREC *)(pMyCDS->lpData))->s1, (LPSTR) ((MYREC *)(pMyCDS->lpData))->s2, (DWORD) ((MYREC *)(pMyCDS->lpData))->n ); } break;

[encoderlee]

跨进程传递数据请发WM_COPYDATA消息。 也可以使用其它进程间通信技术，比如管道、邮槽、共享内存、DLL共享节、剪贴板等

[schlafenhamster]

WM_SETTEXT 本来可以跨进程（系统做了处理）， 你搞了一个 WM_mymessage1 就不行了

[jacksonfan]

自定义消息也是跨进程的 发消息看起来是没问题 感觉问题应该不是接收的问题，估计是其他操作引起 在接收端消息响应函数里断点看看，lparam是否有值

[Eleven]

你发送的是WM_SETTEXT消息吗？

[schlafenhamster]

http://blog.csdn.net/lxa520/article/details/38816399 “ 跨进程 WM_SETTEXT”

[ccrun.com]

发送原生的字符串，如char *或wchar_t *

[Eddie780]

明白了，自定义消息无法跨进程发送CString。谢谢大家

[zwfgdlc]

先要用WriteProcessMemory()把lParam写入目标进程,然后传递过去 你传递的是本进程的指针,在其他进程上可能根本就不存在