Dialog Boxes
Author
I am currently working on a windows app with GDI graphics. I''m using Visual C++ 6.0. I have created an "about" dialog box but whenever I have it pop up during the program it''s client area is all white and I am unable to move it. I have a feeling it has something to do with my GDI routines running in the parent window, but I have been unable to solve the problem. Any suggestions?
I assume that you have defined the aboutbox resource with resource id IDD_ABOUT with one OK button with id IDOK
first create a callback function for the dialog
where hInstance is the program instance
and hwnd is the parent window
Hope this helps
first create a callback function for the dialog
BOOL CALLBACK AboutProc(HWND hDlg,UINT iMsg,WPARAM wParam,LPARAM lParam){ switch(iMsg) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: switch(LOWORD(wParam)) { case IDOK: EndDialog(hDlg,IDOK); return TRUE; default: break; } default: break; } return FALSE;}you can then call it using DialogBox(hInstance,IDD_ABOUT,hwnd,AboutProc); where hInstance is the program instance
and hwnd is the parent window
Hope this helps
Author
Right now I just have a basic little dialog box with an OK button and a CANCEL button. I have everything set up correctly (as far as I can tell). This problem is driving me insane. Does anyone else have any ideas?
The only reason your dialog box wouldn''t paint itself and wouldn''t respond to move requests is if your app''s message pump weren''t flowing. That could be because you haven''t set it up properly or you have some operation that has blocked it. You mentioned GDI stuff...make sure you''re calling ValidateRect after all of your drawing, otherwise Windows won''t know that your done drawing and it will keep sending paint messages and your app will come to a grinding halt; this could be the thing killing your message pump flow.
Author
Well I just figured it out everybody. After a lengthy search through the gamedev.net General Programming Forum archives, I came up with this tidbit written last summer by The Senshi:
...a bool is different from a BOOL.
bool == char (i.e, a 1 byte variable)
BOOL == unsigned int (4 byte variable)
Here is my previous Dialog Procedure declaration:
Please note the lower-case (and thus incorrect) version of bool. I merely capitalized bool to BOOL and it works perfectly now!
Thanks for all the help everybody!
Edited by - drsixstring on January 30, 2002 4:12:06 PM
...a bool is different from a BOOL.
bool == char (i.e, a 1 byte variable)
BOOL == unsigned int (4 byte variable)
Here is my previous Dialog Procedure declaration:
bool CALLBACK DialogFunc( HWND hdwnd, UINT message, WPARAM wParam, LPARAM lParam ) Please note the lower-case (and thus incorrect) version of bool. I merely capitalized bool to BOOL and it works perfectly now!
BOOL CALLBACK DialogFunc( HWND hdwnd, UINT message, WPARAM wParam, LPARAM lParam ) Thanks for all the help everybody!
Edited by - drsixstring on January 30, 2002 4:12:06 PM
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
