Errors with resource bitmaps....HELP PLEASE!

Ok here's some code:

I first declared:

static HBITMAP loadLogo ;
static int cxClient, cyClient, cxSource, cySource;
BITMAP bitmap ;
HDC hdc, hdcMem ;
HINSTANCE hInstance ;
PAINTSTRUCT ps;

Then:

case WM_CREATE:
loadLogo=LoadBitmap(hInst, MAKEINTRESOURCE(402));

if(!loadLogo)
{
MessageBox(hwnd, "Error", "Error", 1);
}

GetObject(loadLogo, sizeof(loadLogo), &bitmap);
cxSource=bitmap.bmWidth;
cySource=bitmap.bmHeight;
break;
case WM_PAINT:
hdcMem=CreateCompatibleDC(hdc);
SelectObject(hdcMem, loadLogo);
BitBlt(hdc, 1, 1, 50, 50, hdcMem, 0, 0, SRCCOPY);
break;
case WM_DESTROY:
DeleteObject(loadLogo);

PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;

But it shows the error message that is used for if(!loadLogo), and it shows up, and then my BMP doesn't load. What do I do?

>>loadLogo=LoadBitmap(hInst, MAKEINTRESOURCE(402));
402???
is that what you called your bitmap inside the reource. thats all i can think of. try renaming your bitmap to IDB_BITMAP1 and then call loadLogo=LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1)); and see what happens.

on my program with my resource bitmap, when I minimize the program and I pop it back up the Bitmap dissapears. Could anyone help?

Put this in your code:

Code:

case WM_PAINT:
{
     // draw bitmap to window
}
break;

the WM_PAINT message is sent to your window every time your window needs repainting.

howbout we pretend you didn't say that.

> on my program with my resource bitmap, when I minimize the program and I pop it back up the Bitmap dissapears. Could anyone help? <

Where is the code that puts the bitmap on the window? If it is in WM_PAINT, then it should repaint the picture right on the client area when you maximize it.

Or, you know what might help, is set the WNDCLASS's style property to CS_HREDRAW | CS_VREDRAW. This tells the window to repaint every time that the height and/or width is changed.

Try this out and tell me if it works.

--Garfield

Xterria
Sounds like you need to invoke a paint msg with InvalidateRect() or UpdateWindow() after the maximise.
It could also be that the BMP was drawn to the HDC but when the screen minimised, then a new blank HDC is drawn on maximise (in the paint function). Check that on maximise you are coping your framebuffer back to the screen HDC.

SyntaxBubble
Not exactly the way to do paint calls. OK unless it is not the area that needs paint. Look in the help for BeginPaint(), GetUpdateRect(), IsRectEmpty(), EndPaint() and in particular the PAINTSTRUCT.
You create a DC compat with HDC, where do you get HDC from? Try GetDC() (look it up) and creatcompat with that DC. Remember each Object you create/get MUST be released/deleted or you will loose memory.
Any HDC MUST be put back EXACTLY as you found it before you Delete/release it.

HDC's declared in the callback are also a very bad idea as they will loose their value as soon as the callback is left and get a new one when it returns. Each time this costs memory. Try putting a break point on the main switch to see how many times the callback function is called.

Try

Code:

case WM_CREATE: 
loadLogo=LoadBitmap(hInst, MAKEINTRESOURCE (ID_OFMYBITMAP)); 
if(!loadLogo) 
{ 
    sprintf(sBuffer,"LoadBitmap failed in MainCallback with error#%d.",GetLastError());
    MessageBox(hwnd, sBuffer, "Error", MB_ICONERROR|MB_OK); 
}

At least this will tell you where in your code the error occured, what the error was and so give you a chance to fix it.

Sounds like you need to invoke a paint msg with InvalidateRect() or UpdateWindow() after the maximise.

What means that?
How do I do updatewindow() AFTER the maximize?

Process your WM_SIZE, or WM_SIZEING ect, msg and look for the WPARAM==SIZE_MAXIMISED

If you 'wipe' the area with another window does the BPM reappear? Before you minimise if you 'wipe' the BMP with another window so it needs to be repainted does it?
By 'wipe' I mean get another small window, say your resource meter, volume control ect and drag it over the BMP. If your paint is working it should redraw.

Here is a function to use in WM_PAINT

Code:

void   RePaint(HWND hDlg,HDC hdcScreen)
{
RECT                  Rect;
PAINTSTRUCT           ps;

GetUpdateRect(hWnd, &Rect, 0);
if (IsRectEmpty(&Rect))
   {
   GetClientRect(hWnd,&Rect);
   }
BeginPaint(hWnd, &ps);
BitBlt(ps.hdc, Rect.left, Rect.top, Rect.right - Rect.left, Rect.bottom - Rect.top, hdcScreen, Rect.left, Rect.top, SRCCOPY);
EndPaint(hWnd, &ps);
}

I have another HDC, exactly the same as the hdcScreen called hdcBuffer.
All drawing is done to the hdcBuffer. When it is ready it is BitBlt'ed to the hdcScreen. The area draw is known and this is sent for painting using InvalidateRect(), calling the paint function above.
I keep the HWND, HDC's(screen and Buffer) ect in an array of structures. I use defined values to navigate thru the array. I set the initial values to NULL. I set them up in WM_CREATE for the dlg as needed and then check on close if they have been allocated and so free the resources.

nevermind, nothings working. I'll just get rid of the bitmap...

To create your DC's
HWND hWnd;//the HWND of the ctrl or dlg you want to repaint
HDC hdc;//temp HDC
HDC hdcBuffer;//the hdc to draw to
HDC hdcScreen;//the hdc drawn finally to the screen
//iWidth & iHeight are calculated from the ClientRect of the ctrl or dlg (GetClientRect (hWnd, &CientRect); )

Code:

hdc=GetDC(hWnd);
hdcScreen=CreateCompatibleDC(hdc);
hBitmap=CreateCompatibleBitmap(hdc, iWidth, iHeight );
//save the bitmap already in the hdc to be returned at close 
hSysBitmap=SelectObject(hdcScreen,hBitmap);
ReleaseDC(hWnd,hdc);
//paint it white
BitBlt(hdcScreen, 0, 0, iWidth, iHeight, hdcScreen, 0, 0, WHITENESS);
//Repeat for hdcBuffer.

//Load your bitmap and draw/select to the hdcBuffer
//BitBlt hdcBuffer onto hdcScreen
InvalidateRect(hWnd,&ClientRect,FALSE);
//Use the RePaint() under the WM_PAINT in your callback

Clean up the hdc's by putting the system bitmaps back at close with SelectObject() (catch the returns). Then DeleteObject() the comp bitmaps and finally DeleteDC() the two hdc's.

Simple huh?

XTerria
Your your home page is not working with Netscape 4.7.

The HTML for the popup works but not much else.

I went to the tute index and first tute, got the page from your HTML, but again no display.

Yeah I know, it only works with Internet Explorer.