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POHow to avoid repeated SendMessage
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  1. POHow to avoid repeated SendMessage
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    copied!<p>I have a problem: I use SendMessage from a procedure in a DLL to communicate with the main window; procedure is a hook procedure that allows main window to know when mouse right button is clicked in a editbox; it sends also handle of the editbox. It works well, except for this bug: when program is running without breakpoints main window receives twice the same message (in this case WM_APP), while if I put a breakpoint in the hook procedure or in the block that handles WM_APP messages the message is considered once. For further descriptions ask me. Following the code of the hook procedure and of the block that handles WM_APP messages. Thanks</p> <p><strong>Hook procedure</strong></p> <pre><code>MYDLL_API LRESULT CALLBACK mouseProc(int nCode, WPARAM wParam, LPARAM lParam) { // processes the message if(nCode &gt;= 0) { // if user clicked with mouse right button if(wParam != NULL &amp;&amp; (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-&gt;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); } </code></pre> <p><strong>block in main program that handles WM_APP messages</strong></p> <pre><code>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-&gt;hwnd); // if text has been inserted if(n &gt; 0 &amp;&amp; n &lt; 1024) { wchar_t *s = (wchar_t*) malloc((n+1)*sizeof(wchar_t)); // gets text GetWindowText(m-&gt;hwnd, (LPWSTR) s, n+1); s[n] = (wchar_t) 0; //MessageBox(hWnd, (LPCWSTR)s, (LPCWSTR)L"Test", MB_OK); // saves text in database stateClassPointer-&gt;insertInList(s); } } break; </code></pre>
 

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