subject_63918.htm

vc

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序号：63918 发表者：alang 发表日期：2003-12-07 17:24:26
<br>主题：为什么发送消息不能发送CString字符串的啊
<br>内容：看我的代码：<BR>我在一个对话框向父窗口发送字符串:<BR>void CXilieSelectDlg::OnOK() <BR>{<BR>&nbsp;&nbsp;CString str=&#34;My Message&#34;;<BR>&nbsp;&nbsp;GetParent()-&gt;PostMessage(WM_MY_XILIEDLG,0,(LPARAM)(LPCTSTR)str);<BR>}<BR>父窗口成功接收到消息<BR>LRESULT CSXBaohuoDlg::OnMyXilieDlg(WPARAM wParam,LPARAM lParam)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CString str=(LPCTSTR)lParam;<BR>&nbsp;&nbsp;&nbsp;&nbsp;MessageBox(str);<BR>&nbsp;&nbsp;&nbsp;&nbsp;return 0;<BR>}<BR>为什么str是“葺葺葺葺葺葺@”莫名其妙的东西出来？
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<font color=red>答案被接受</font><br>回复者：浩公 回复日期：2003-12-07 17:44:38
<br>内容：你这句 CString str=&#34;My Message&#34; 定义了一个临时的变量 str<BR>这个值在函数结束时已经无效了。所以收到的是乱码。<BR><BR>可以改为 <BR>void CXilieSelectDlg::OnOK() <BR>{<BR>&nbsp;&nbsp;char * psz = new char[128] ;<BR>&nbsp;&nbsp;ZeroMemory(psz, sizeof(psz)) ;<BR>&nbsp;&nbsp;strcpy(psz, &#34;My Message&#34;) ;<BR>&nbsp;&nbsp;GetParent()-&gt;PostMessage(WM_MY_XILIEDLG,0,(LPARAM)(LPCTSTR)str);<BR>}<BR>父窗口成功接收到消息<BR>LRESULT CSXBaohuoDlg::OnMyXilieDlg(WPARAM wParam,LPARAM lParam)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CString str=(LPCTSTR)lParam;<BR>&nbsp;&nbsp;&nbsp;&nbsp;MessageBox(str);<BR><BR>&nbsp;&nbsp;// 记住 ,要 delete <BR>&nbsp;&nbsp; delete []str ;<BR>&nbsp;&nbsp;&nbsp;&nbsp;return 0;<BR>}<BR>
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