我遇到了一个问题:我使用DLL中的一个过程中的SendMessage与主窗口进行通信; procedure是一个钩子程序,它允许主窗口知道在编辑框中点击鼠标右键的时间;它还发送编辑框的句柄。它运行良好,除了这个错误:程序运行时没有断点主窗口收到两次相同的消息(在本例中为WM_APP),而如果我在钩子程序或处理WM_APP消息的块中放置一个断点,则消息是考虑一次。有关进一步说明,请问我。遵循钩子过程的代码和处理WM_APP消息的块的代码。感谢
挂钩程序
MYDLL_API LRESULT CALLBACK mouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
// processes the message
if(nCode >= 0)
{
// if user clicked with mouse right button
if(wParam != NULL && (wParam == WM_RBUTTONDOWN || wParam == WM_RBUTTONUP))
{
wchar_t *s = (wchar_t*) malloc(CLASSNAMELEN*sizeof(wchar_t));
//MessageBox(mainHwnd, (LPCWSTR)L"Captured mouse right button", (LPCWSTR)L"Test", MB_OK);
MOUSEHOOKSTRUCT *m = (MOUSEHOOKSTRUCT*) lParam;
GetClassName(m->hwnd, (LPWSTR) s, CLASSNAMELEN);
//MessageBox(mainHwnd, (LPCWSTR) s, (LPCWSTR)L"Test", MB_OK);
// only if user clicked on a edit box
if(wcsncmp(s, L"Edit", 4) == 0)
SendMessage(mainHwnd, WM_APP, 0, (LPARAM) lParam);
free(s);
s = NULL;
}
}
// calls next hook in chain
return CallNextHookEx(NULL, nCode, wParam, lParam);
}
阻止处理WM_APP消息的主程序
case WM_APP:
{
//MessageBox(hWnd, (LPCWSTR)L"Received WM_APP", (LPCWSTR)L"Test", MB_OK);
// copies text from the edit box
MOUSEHOOKSTRUCT *m = (MOUSEHOOKSTRUCT*) lParam;
int n = GetWindowTextLength(m->hwnd);
// if text has been inserted
if(n > 0 && n < 1024)
{
wchar_t *s = (wchar_t*) malloc((n+1)*sizeof(wchar_t));
// gets text
GetWindowText(m->hwnd, (LPWSTR) s, n+1);
s[n] = (wchar_t) 0;
//MessageBox(hWnd, (LPCWSTR)s, (LPCWSTR)L"Test", MB_OK);
// saves text in database
stateClassPointer->insertInList(s);
}
}
break;
答案 0 :(得分:3)
这可能是因为您正在发送WM_RBUTTONDOWN和WM_RBUTTONUP的消息,即按下右键和释放时的消息。
当你调试时,调试器会吃掉WM_RBUTTONUP,所以你没有得到它。
PS:你不应该使用PostMessage()代替SendMessage(),只是为了安全吗?