How to convert an Array of pixels to HBITMAP
Your post was very helpful (the answer) however it didn't work for me, here is the code with small corrections:
// creating input
unsigned char pixels[160*120*3];
for (int i=0; i<160*120*3; i++)
pixels[i] = (i%4==1)*255; // An BGR (not RGB) 160x120 image.
// at this point we have some input
BITMAPINFOHEADER bmih;
bmih.biSize = sizeof(BITMAPINFOHEADER);
bmih.biWidth = 160;
bmih.biHeight = -120;
bmih.biPlanes = 1;
bmih.biBitCount = 24;
bmih.biCompression = BI_RGB ;
bmih.biSizeImage = 0;
bmih.biXPelsPerMeter = 10;
bmih.biYPelsPerMeter = 10;
bmih.biClrUsed =0;
bmih.biClrImportant =0;
BITMAPINFO dbmi;
ZeroMemory(&dbmi, sizeof(dbmi));
dbmi.bmiHeader = bmih;
dbmi.bmiColors->rgbBlue = 0;
dbmi.bmiColors->rgbGreen = 0;
dbmi.bmiColors->rgbRed = 0;
dbmi.bmiColors->rgbReserved = 0;
HDC hdc = ::GetDC(NULL);
HBITMAP hbmp = CreateDIBitmap(hdc, &bmih, CBM_INIT, pixels, &dbmi, DIB_RGB_COLORS);
if (hbmp == NULL) {
::MessageBox(NULL, L"Could not load the desired image image", L"Error", MB_OK);
return;
}
::ReleaseDC(NULL, hdc);
// a little test if everything is OK
OpenClipboard(NULL);
EmptyClipboard();
SetClipboardData(CF_BITMAP, hbmp);
CloseClipboard();
// cleanup
DeleteObject(hbmp);
I found how to do it.
We need to use CreateDIBSection()
instead of CreateDIBitmap()
So here is the working code
HBITMAP hBitmap = NULL;
unsigned char pixels[160*120*3];
for (int i=0; i<160*120*3; i++){
pixels[i] = (i%4==1)*255; // An BGR (not RGB) 160x120 image.
}
BITMAPINFOHEADER bmih;
bmih.biSize = sizeof(BITMAPINFOHEADER);
bmih.biWidth = 160;
bmih.biHeight = -120;
bmih.biPlanes = 1;
bmih.biBitCount = 24;
bmih.biCompression = BI_RGB ;
bmih.biSizeImage = 0;
bmih.biXPelsPerMeter = 10;
bmih.biYPelsPerMeter = 10;
bmih.biClrUsed =0;
bmih.biClrImportant =0;
BITMAPINFO dbmi;
ZeroMemory(&dbmi, sizeof(dbmi));
dbmi.bmiHeader = bmih;
dbmi.bmiColors->rgbBlue = 0;
dbmi.bmiColors->rgbGreen = 0;
dbmi.bmiColors->rgbRed = 0;
dbmi.bmiColors->rgbReserved = 0;
void* bits = (void*)&(pixels[0]);
// Create DIB
hBitmap = CreateDIBSection(localDC, &dbmi, DIB_RGB_COLORS, &bits, NULL, 0);
if (hBitmap == NULL) {
::MessageBox(NULL, __T("Could not load the desired image image"), __T("Error"), MB_OK);
return;
}
// copy pixels into DIB.
memcpy(bits,pixels,sizeof(pixels));
For grey level images, copy the pixels to DIB in a loop instead of with memcpy()
#define INTENSITY unsigned char
INTENSITY* dest = (INTENSITY*)bits;
const INTENSITY* src = .. Put your char array of pixels;
for (int j=0; j<imageWidth; j++){
for (int i=0; i<imageHeight; i++, src++){
*dest++ = *src;
*dest++ = *src;
*dest++ = *src;
}
// Padd the line to round WORD.
if (imageWidth%2)
*dest++ = 0;
}