显示红色位图

来源：互联网发布：好用的杀毒软件知乎编辑：程序博客网时间：2024/04/25 05:20

int nWidth = 768, nHeight = 576;
//BITMAPINFO
LPBITMAPINFO lpbmi = new BITMAPINFO;
ZeroMemory(lpbmi, sizeof(BITMAPINFO));
lpbmi->bmiHeader.biSize= sizeof(BITMAPINFOHEADER);
lpbmi->bmiHeader.biPlanes= 1;
lpbmi->bmiHeader.biCompression= BI_RGB;
lpbmi->bmiHeader.biClrImportant= 0;
lpbmi->bmiHeader.biSizeImage= 0;
lpbmi->bmiHeader.biClrUsed= 0;
lpbmi->bmiHeader.biBitCount= 24;
lpbmi->bmiHeader.biWidth= nWidth;
lpbmi->bmiHeader.biHeight= nHeight;
lpbmi->bmiHeader.biXPelsPerMeter= 0;
lpbmi->bmiHeader.biYPelsPerMeter= 0;

//创建DIB位图
BYTE*pData;
HBITMAP bmp = CreateDIBSection(NULL, lpbmi, DIB_RGB_COLORS, (void**)&pData, NULL, 0);
ASSERT(bmp);
if (!bmp)
{
GlobalFree(lpbmi);
return;
}
int y = 0, x = 0;
for(y = 0; y < nHeight; y++)
{
for(x = 0; x < nWidth; x++)
{
pData[x * 3 + y * nWidth * 3]= 0;
pData[x * 3 + y * nWidth * 3 + 1]= 0;
pData[x * 3 + y * nWidth * 3 +2]= 255;
}
}
CDC dcComp;
dcComp.CreateCompatibleDC(pDC);
HBITMAP OldBitmap = (HBITMAP)dcComp.SelectObject(bmp);

// draw bitmap
pDC->BitBlt(0, 0, nWidth, nHeight, &dcComp, 0, 0, SRCCOPY);

dcComp.SelectObject(OldBitmap);
DeleteObject(bmp);
DeleteDC(dcComp);
delete lpbmi;