Keyboard response in a dialog, not the main window--thanks a lot

[Sean_Yang]

:confused:I am a new programmer, can't figure out why the keyboard doesn't responds. I traced the following code, the doesn't enter the code corresponding to keyboard at all. Here I attached how the dialog is triggered. Hopefully someone can help me figure it out. Thanks a lot. int APIENTRY WinMain(HINSTANCE hCurrentInst, HINSTANCE hPreviousInst, LPSTR lpszCmdLine, int nCmdShow) { ..... while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } } LRESULT CALLBACK MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { .... hwnddlg = CreateDialog(app_instance, "PARAMETER_WINDOW_DATA", NULL, (DLGPROC) Parameter_Window_Exper); } BOOL CALLBACK Parameter_Window_Exper(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam) { switch (Message) { case WM_CHAR: switch(wParam) { case '1': record_data_pair(1); break; case '2'://0x32: record_data_pair(2); break; case '3'://0x33: record_data_pair(1); break; default: break; } return FALSE; } ..... return FALSE; } Sean

[RicoH]

I think the problems lies in this part of your code... hwnddlg = CreateDialog(app_instance, "PARAMETER_WINDOW_DATA", NULL, (DLGPROC) Parameter_Window_Exper); If you specify 'NULL' as owner of this window, the Desktop will be the parent. However, since this dialogbox doesn't have it's own messageque it won't receive anything. So, if you do it like this, it should work just fine. hwnddlg = CreateDialog(app_instance, "PARAMETER_WINDOW_DATA", hwnd, (DLGPROC) Parameter_Window_Exper); Where 'hwnd' is the handle from your main window (in MainWndProc) Don't think you are, know you are...

[Sean_Yang]

Shall I declare a global HWND hmainwnd; and within the WinMain() function. if (!(hwnd = CreateWindow ("MAINWINDOW", "1DoF Stepper Motor Haptic Device", WS_OVERLAPPEDWINDOW, 0,0, 800, 150, NULL, NULL, hCurrentInst, NULL))) return (0); hmainwnd = hwnd;//like this??? and then when triggering the dialog, I do hwnddlg = CreateDialog(app_instance, "Experiment", hmainwnd, (DLGPROC) Parameter_Window_Exper); But I did so, it doesn't work. The sequence triggered is as following: Main->Dialog_Data->Dialog_Experiment. I want the Dialog_Experiment to respond my keyboard. My code(simplified) is like this:should I change all NULL to hmainwnd? ~~~~~~~~~~~~~~~~~~~~~~~~~~~` extern HWND hwnddlg; int APIENTRY WinMain(HINSTANCE hCurrentInst, HINSTANCE hPreviousInst, LPSTR lpszCmdLine, int nCmdShow) { ... if (!RegisterClass (&wc)) { MessageBox (NULL, (LPCTSTR) "WinMain(): RegisterClass() failed", (LPCTSTR) "Error!", MB_OK | MB_ICONEXCLAMATION); return(FALSE); while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } return (msg.wParam); } ------------------------------------------ LRESULT CALLBACK MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { ... hwnddlg = CreateDialog(app_instance, "PARAMETER_WINDOW_DATA", NULL, (DLGPROC) Parameter_Window_Data); } ------------------------------------------- BOOL CALLBACK Parameter_Window_Data(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam) { ... DestroyWindow(hWnd); hwnddlg = CreateDialog(app_instance, EXPER_INTRO_DIALOG, NULL, (DLGPROC) Parameter_Window_Exper); } ------------------------------------------- BOOL Parameter_Window_Exper(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam) { case WM_CHAR: switch(wParam) { case '1': MessageBox(hmainwnd, "Happen?", "TEST Box", MB_OK); record_data_pair(1); break; case '2'://0x32: record_data_pair(2); break; case '3'://0x33: record_data_pair(1); break; default: break; } return FALSE; } Thanks Sean

[RicoH]

I don't think you have to declare a global variable. This should do the trick (and if not, I'll need to see more of your code): LRESULT CALLBACK MainWndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { ... hwnddlg = CreateDialog(app_instance, "PARAMETER_WINDOW_DATA", hwnd, (DLGPROC) Parameter_Window_Data); } ------------------------------------------- BOOL CALLBACK Parameter_Window_Data(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam) { ... DestroyWindow(hWnd); hwnddlg = CreateDialog(app_instance, EXPER_INTRO_DIALOG, hWnd, (DLGPROC) Parameter_Window_Exper); } ------------------------------------------- You see, just give it the handle to the parent in stead of using NULL (which means the desktop) Don't think you are, know you are...

[Sean_Yang]

I did so as you posted, but the child dialog (EXPER_INTRO_DIALOG) can't be displayed. I wonder if the problem now(not display at all) is because DestroyWindow(hWnd) has killed the parent dialog. Anyway, I guess I can get my program done under your help. Regards, Sean