进程间通信的WM_COPYDATA的使用

淡淡的烟草味﹌ 2022-03-29 09:11 94阅读 0赞

[http://blog.csdn.net/ao929929fei/article/details/6316174][http_blog.csdn.net_ao929929fei_article_details_6316174]

接收数据的一方

ON\_WM\_COPYDATA()

afx\_msg BOOL OnCopyData(CWnd\* pWnd, COPYDATASTRUCT\* pCopyDataStruct);

代码片段：

**\[cpp\]** [view plain][http_blog.csdn.net_ao929929fei_article_details_6316174] [copy][http_blog.csdn.net_ao929929fei_article_details_6316174]

1.  BOOL CClientDemoDlg::OnCopyData(CWnd\* pWnd, COPYDATASTRUCT\* pCopyDataStruct)
2.  \{
3.  if (pCopyDataStruct != NULL)
4.  \{
5.  LPCTSTR pszText = (LPCTSTR)(pCopyDataStruct->lpData);
6.  DWORD dwLength = (DWORD)(pCopyDataStruct->cbData);
7.  TCHAR szRecvText\[1024\] = \{0\};
8.  memcpy(szRecvText, pszText, dwLength);
9.  MessageBox(szRecvText, \_T("Test"), MB\_OK);
10. \}
11. 
12. return CDialog::OnCopyData(pWnd, pCopyDataStruct);
13. \}

发送数据的一方

代码片段：

**\[cpp\]** [view plain][http_blog.csdn.net_ao929929fei_article_details_6316174] [copy][http_blog.csdn.net_ao929929fei_article_details_6316174]

1.  CString strWindowTitle = \_T("ClientDemo");
2.  CString strDataToSend = \_T("Hello, Everyone fsdfsdfsdfdsfds,this is a test demo!");
3.  
4.  HWND hOtherWnd = ::FindWindow(NULL, strWindowTitle.GetBuffer(0));
5.  if (hOtherWnd != NULL && ::IsWindow(hOtherWnd))
6.  \{
7.  COPYDATASTRUCT cpd;
8.  cpd.dwData = 0;
9.  cpd.cbData = strDataToSend.GetLength() \* sizeof(TCHAR);
10. cpd.lpData = (void\*)strDataToSend.GetBuffer(0);
11. HRESULT hResult = ::SendMessage(hOtherWnd, WM\_COPYDATA, (WPARAM)(AfxGetApp()->m\_pMainWnd), (LPARAM)&cpd);
12. strDataToSend.ReleaseBuffer();
13. \}

OK了，就这么简单

WM\_COPYDATA消息主要目的是允许在进程间传递少量只读数据。SDK文档推荐用户使用SendMessage()函数，接收方在数据复制完成前不返回，这样发送方就不可能删除和修改数据。

[http_blog.csdn.net_ao929929fei_article_details_6316174]: http://blog.csdn.net/ao929929fei/article/details/6316174