Wm_paint/dialog

I fixed the menu! But new problems keep coming!!!

- When does the Window procedure get the WM_PAINT message?
- Dialog:

in resources.rc file:

Code:

IDD_ABOUT DIALOG DISCARDABLE 0, 0, 239, 66 STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU CAPTION "My About Box" FONT 8, "MS Sans Serif" BEGIN DEFPUSHBUTTON "&OK",IDOK,174,18,50,14 PUSHBUTTON "&Cancel",IDCANCEL,174,35,50,14 GROUPBOX "About this program...",IDC_STATIC,7,7,225,52 CTEXT "An example program showing how to use Dialog Boxes\r\n\r\nby theForger", IDC_STATIC,16,18,144,33 END

nothing about the dialog in the resource.h file

in part of main code:

Code:

BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) { switch(Message) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: switch(LOWORD(wParam)) { case IDOK: EndDialog(hwnd, IDOK); break; case IDCANCEL: EndDialog(hwnd, IDCANCEL); break; } break; default: return FALSE; } return TRUE; } // is the dialog procedure case WM_COMMAND: // WM_COMMAND message in windows procedure switch(LOWORD(wParam)) { case ID_FILE_EXIT: PostMessage(hwnd, WM_CLOSE, 0, 0); break; case ID_HELP_ABOUT: { int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc); if(ret == IDOK){ MessageBox(hwnd, "Dialog exited with IDOK.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == IDCANCEL){ MessageBox(hwnd, "Dialog exited with IDCANCEL.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == -1){ MessageBox(hwnd, "Dialog failed!", "Error", MB_OK | MB_ICONINFORMATION); } } break; case ID_STUFF_GO: hdc = BeginPaint (hwnd, &ps) ; GetClientRect (hwnd, &rect) ; DrawText (hdc, TEXT ("You pressed the leftmouse button!"), -1, &rect, DT_SINGLELINE | DT_LEFT | DT_BOTTOM) ; EndPaint (hwnd, &ps) ; break; } break;

It says: main1.cpp:50: `IDD_ABOUT' undeclared (first use this function)

How can I fix this problem?

you could just add IDD_ABOUT to resource.h followed by a number that is greater that the greatest number currently in resource.h. Make sure there is no two numbers being the same.

The IDD_ snd IDC_ are only mappings kind of like #define. Hope it helps
Amish

>>- When does the Window procedure get the WM_PAINT message?

When you call for it or when the OS calls for it due to your window being covered / uncovered by another window.

To call for you own paint use

InvalidateRect() //send paint msg
UpdateWindow() //post directly to the apps msg que bypassing the OS que for faster drawing

I put the

Code:

#define IDD_ABOUT 100001

in my resource.h file,
but it says (Messagebox) Dialog failed, because

Code:

int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc); if(ret == IDOK){ MessageBox(hwnd, "Dialog exited with IDOK.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == IDCANCEL){ MessageBox(hwnd, "Dialog exited with IDCANCEL.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == -1){ MessageBox(hwnd, "Dialog failed!", "Error", MB_OK | MB_ICONINFORMATION); }

What can I do to fix it?

change the return TRUEs to return FALSEs.

Look up DefWindowProc()

Im having the same problem

Hi guys.

this is my first post to this forum.

im having the same problem as ideswa with regards to the dialog box.

i have the following code

Code:

BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) { switch(Message) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: switch(LOWORD(wParam)) { case IDOK: EndDialog(hwnd, IDOK); break; case IDCANCEL: EndDialog(hwnd, IDCANCEL); break; } break; default: return FALSE; } return TRUE; }

^^ thats in the main .cpp file

Code:

case WM_COMMAND: { switch(LOWORD(wParam)) { case ID_HELP_ABOUT: { int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc); if(ret == IDOK){ MessageBox(hwnd, "Dialog exited with IDOK.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == IDCANCEL){ MessageBox(hwnd, "Dialog exited with IDCANCEL.", "Notice", MB_OK | MB_ICONINFORMATION); } else if(ret == -1){ MessageBox(hwnd, "error", "Error", MB_OK | MB_ICONINFORMATION); } } break; } }

^^ also in main.cpp

Code:

#include "resource.h" #include "windows.h" IDR_MYMENU MENU BEGIN POPUP "&File" BEGIN MENUITEM "E&xit", ID_FILE_EXIT END POPUP "&Help" BEGIN MENUITEM "&About The Program", ID_HELP_ABOUT MENUITEM "G&Help", 0, GRAYED END END IDD_ABOUT DIALOG DISCARDABLE 0, 0, 239, 66 STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU CAPTION "My About Box" FONT 8, "MS Sans Serif" BEGIN DEFPUSHBUTTON "&OK",IDOK,174,18,50,14 PUSHBUTTON "&Cancel",IDCANCEL,174,35,50,14 GROUPBOX "About this program...",IDC_STATIC,7,7,225,52 CTEXT "An example program showing how to use Dialog Boxes\r\n\r\nby theForger", IDC_STATIC,16,18,144,33 END

^^ my only resource file resource.rc

the problem is that when i press the about menu item. instead of the dialog box showing up i just get the error message box. that means

Code:

DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUT), hwnd, AboutDlgProc);

is returning -1. ive been looking into this and heard that it could be a problem with the resource files but i dont think it is in this case because the menu works and that relies on the resource file. possibly somthing wrong with the IDD_ABOUT entry in the resource file. any ideas would be greatly appretiated. Oh and do i have to declare this at the start of the program?

Code:

BOOL CALLBACK AboutDlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);

Liam

Place a break point in the About box's InitDlg handler and default case. I think the dlg is failing after it creates.

I would.......

Change the catch all 'return TRUE' to a 'return FALSE' to show you did not process that msg.

Return the result from a call to DefWndProc() in your 'default' case in the about box's callback (to get windows to process all msgs you don't have code for).