create a white image

hi all,

i want a white image file with very large pixel, say about 40000 X 40000, since i cannot find the same size of image to turn it into white, so i need to create myself. but i 'm new in mfc graphics, does anybody knwo how to create it? what is the procedure or any sample code? thanks!

create a raw bitmap image, you don't need mfc, just use plain old C to write a file header and set the data field to all 0xFF.

Quote:

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Originally Posted by mr_empty

hi all,

i want a white image file with very large pixel, say about 40000 X 40000, since i cannot find the same size of image to turn it into white, so i need to create myself. but i 'm new in mfc graphics, does anybody knwo how to create it? what is the procedure or any sample code? thanks!

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In MFC something like;

Code:

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//needs error checking

//create an image object
CImage  Image;
Image.Create(40000,40000,32,0);//change depth and flags as needed

//get the DC to draw to
CDC *pDC=CDC::FromHandle(Image.GetDC());
//fill with white
pDC->FillSolidRect(0,0,40000,40000,RGB(255,255,255));

//save image
CString sPath="C:\\SomeFolder\\WhiteImage.bmp";
Image.Save(sPath,GUID_NULL);

//clean up
Image.ReleaseDC(pDC->Detach());

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It is easier if you don't need to save the image. Use GetDC(), CreateCompatibleBitmap(), FillRect() and ReleaseDC().