MFC线程中的进度条被阻塞
MFC线程中的进度条被阻塞
提问于 2011-11-01 20:08:08
对于一个MFC项目，我必须在一个单独的UI线程(CWinThread)中创建一个进度条对话框(CWinThread)。我从http://adilevin.wordpress.com/2009/06/29/user-interface-threads-in-mfc/站点上拿了这个例子。它自己工作。(基本上，它有两个进度条，一个来自主gui线程，一个在单独的ui线程中创建。该示例演示了在主gui线程中执行的计算不会干扰在ui线程中创建的进度条)。
但是，当我将代码放入我的应用程序中时，进度条就卡在了对SetPos的CProgressCtrl调用中。当我冻结主线程(当它正在运行计算时)时，我从Visual获得消息
进程似乎已陷入僵局(或没有运行任何用户模式代码)。所有线程都已停止。
所以看起来用户界面线程在等待主线程的消息吗？但我不知道它还在等什么。下面是ui线程的调用堆栈，它在其中被卡住了。
user32.dll!GetPropW() + 0x72 bytes
[Frames below may be incorrect and/or missing, no symbols loaded for user32.dll]
user32.dll!SendMessageW() + 0x4c bytes
uxtheme.dll!DrawThemeParentBackgroundEx() + 0x114 bytes
comctl32.dll!GetEffectiveClientRect() + 0x28f0 bytes
comctl32.dll!GetEffectiveClientRect() + 0x2916 bytes
comctl32.dll!GetEffectiveClientRect() + 0x2af3 bytes
comctl32.dll!GetEffectiveClientRect() + 0x2a25 bytes
comctl32.dll!GetEffectiveClientRect() + 0x2992 bytes
user32.dll!gapfnScSendMessage() + 0x270 bytes
user32.dll!gapfnScSendMessage() + 0x922 bytes
user32.dll!FillRect() + 0x110 bytes
user32.dll!CallWindowProcA() + 0x1b bytes
mfc100d.dll!CWnd::DefWindowProcA(unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 1089 + 0x20 bytes C++
mfc100d.dll!CWnd::WindowProc(unsigned int message=15, unsigned int wParam=0, long lParam=0) Line 2088 + 0x1c bytes C++
mfc100d.dll!AfxCallWndProc(CWnd * pWnd=0x08156d68, HWND__ * hWnd=0x00012452, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 257 + 0x1c bytes C++
mfc100d.dll!AfxWndProc(HWND__ * hWnd=0x00012452, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 420 C++
cv32.dll!AfxWndProcDllStatic(HWND__ * hWnd=0x00012452, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0) Line 54 + 0x15 bytes C++
user32.dll!gapfnScSendMessage() + 0x270 bytes
user32.dll!GetDC() + 0x52 bytes
user32.dll!GetWindowLongW() + 0x18a bytes
user32.dll!GetDC() + 0xab bytes
ntdll.dll!KiUserCallbackDispatcher() + 0x2e bytes
comctl32.dll!GetEffectiveClientRect() + 0x2660 bytes
comctl32.dll!RegisterClassNameW() + 0x37e bytes
user32.dll!gapfnScSendMessage() + 0x270 bytes
user32.dll!gapfnScSendMessage() + 0x922 bytes
user32.dll!FillRect() + 0x110 bytes
user32.dll!CallWindowProcA() + 0x1b bytes
mfc100d.dll!CWnd::DefWindowProcA(unsigned int nMsg=1026, unsigned int wParam=65, long lParam=0) Line 1089 + 0x20 bytes C++
mfc100d.dll!CWnd::WindowProc(unsigned int message=1026, unsigned int wParam=65, long lParam=0) Line 2088 + 0x1c bytes C++
mfc100d.dll!AfxCallWndProc(CWnd * pWnd=0x08156d68, HWND__ * hWnd=0x00012452, unsigned int nMsg=1026, unsigned int wParam=65, long lParam=0) Line 257 + 0x1c bytes C++
mfc100d.dll!AfxWndProc(HWND__ * hWnd=0x00012452, unsigned int nMsg=1026, unsigned int wParam=65, long lParam=0) Line 420 C++
cv32.dll!AfxWndProcDllStatic(HWND__ * hWnd=0x00012452, unsigned int nMsg=1026, unsigned int wParam=65, long lParam=0) Line 54 + 0x15 bytes C++
user32.dll!gapfnScSendMessage() + 0x270 bytes
user32.dll!gapfnScSendMessage() + 0x922 bytes
user32.dll!GetWindow() + 0x21a bytes
user32.dll!SendMessageA() + 0x4c bytes
mfc100d.dll!CProgressCtrl::SetPos(int nPos=65) Line 363 + 0x46 bytes C++
cv32.dll!CProgressCtrlWithTimer::OnTimer(unsigned int nIDEvent=1) Line 1577 C++有人知道怎么回事吗？
当我单独运行示例应用程序时，它不会调用uxtheme.dll，因为它不在示例中使用。最后一个SendMessageW会是问题吗？
回答 1
Stack Overflow用户
发布于 2011-11-02 13:41:28
SetPos意味着对SendMessage的调用，这是一个阻塞调用。您必须永远不要跨线程边界调用SendMessage，因为这注定会导致死锁。
如果需要更新运行在主线程上的GUI，则必须使用PostMessage
PostMessage(hWndMain, UWM_MYMESSAGE, progress, 0);并在主线程中处理消息：
LRESULT OnMyMessage(WPARAM wParam, LPARAM lParam)
{
m_progress.SetPos((int)wParam);
return 1;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/7972248
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