subject_19952.htm

一些关于vc的问答

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序号：19952 发表者：紫云 发表日期：2002-11-01 15:16:51
<br>主题：一个关于thread的菜鸟级问题
<br>内容：本人初学VC++，正在学习线程编程，遇到一些问题，向各位大侠请教<BR><BR>建立一个工作线程，不断刷新主线程窗体 StaticText,但报异常，<BR>应该是线程同步刷新问题，但不知该怎么写,请帮助<BR><BR>代码如下：<BR>//<BR>typedef struct {<BR>&nbsp;&nbsp;&nbsp;&nbsp;CWnd*&nbsp;&nbsp;&nbsp;&nbsp;fhWnd;//主窗体句柄<BR>&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;&nbsp;&nbsp;&nbsp;nShowCount; //显示的数字初始值<BR>}TTHREADPARAM, *LPTTHREADPARAM;<BR><BR>// Thread test<BR>UINT Watch(LPVOID lpParam)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;int i=0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char szBuf[10];<BR>&nbsp;&nbsp;&nbsp;&nbsp;TTHREADPARAM *pTP = (TTHREADPARAM *)lpParam;<BR>&nbsp;&nbsp;&nbsp;&nbsp;for (i=0;i&lt;10;i++)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;memset(szBuf,0,sizeof(szBuf));<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//_itoa(pTP-&gt;nShowCount++,szBuf,10);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//Static_SetText(pTP-&gt;fhWnd-&gt;m_hWnd, _TEXT("33"));<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SetDlgItemInt(pTP-&gt;fhWnd, IDC_NCOUNT,&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ++pTP-&gt;nShowCount , FALSE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sleep(1000);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;return(0);<BR>}<BR><BR><BR>void CFileChangeView::OnStart() <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;// TODO: Add your control notification handler code here<BR>&nbsp;&nbsp;&nbsp;&nbsp;DlgOpenChange();<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_bWatchClose = false;<BR>&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;TTHREADPARAM tdp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;tdp.fhWnd = GetDlgItem(IDC_NCOUNT);<BR>&nbsp;&nbsp;&nbsp;&nbsp;tdp.nShowCount = GetDlgItemInt(IDC_NCOUNT);<BR><BR>//&nbsp;&nbsp;&nbsp;&nbsp;SetDlgItemInt(IDC_NCOUNT, 100123 , FALSE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CWinThread * pThread = <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AfxBeginThread(Watch, &tdp);<BR><BR><BR>}<BR>
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回复者：CDMA2000 回复日期：2002-11-01 15:33:40
<br>内容：SetDlgItemInt（）的第一个参数应该是handle of dialog box<BR>但<BR>&nbsp;&nbsp;&nbsp;&nbsp;tdp.fhWnd = GetDlgItem(IDC_NCOUNT);<BR>&nbsp;&nbsp;&nbsp;&nbsp;tdp.nShowCount = GetDlgItemInt(IDC_NCOUNT);<BR>你将tdp.fhWnd 传递的是控件的指针啊<BR><BR>你的结构应该这样<BR>typedef struct {<BR>&nbsp;&nbsp;&nbsp;&nbsp;HWND&nbsp;&nbsp; fhWnd;//主窗体句柄<BR>&nbsp;&nbsp;&nbsp;&nbsp;int&nbsp;&nbsp;&nbsp;&nbsp;nShowCount; //显示的数字初始值<BR>}TTHREADPARAM, *LPTTHREADPARAM;<BR><BR>还有tdp.fhWnd = GetDlgItem(IDC_NCOUNT);<BR>应该改为tdp.fhWnd = GetSafeHwnd();<BR><BR>
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回复者：不说 回复日期：2002-11-01 15:34:09
<br>内容：CWnd是不可以传进thread的，进去以后handle就自动变成NULL了<BR>2002-11-1 21:17:55