Win32 C/C++从内存缓冲区加载图像

Question

我想在Win32应用程序上加载图像(.bmp)文件,但我不想使用Windows API中的标准LoadBitmap/LoadImage:我希望它从已经在内存中的缓冲区加载.我可以直接从文件中轻松加载位图并将其打印在屏幕上,但这个问题让我陷入困境.

我正在寻找的功能是这样的:

HBITMAP LoadBitmapFromBuffer(char* buffer, int width, int height);

Answer 1

尝试CreateBitmap()：

HBITMAP LoadBitmapFromBuffer(char *buffer, int width, int height)
{
    return CreateBitmap(width, height, 1, 24, buffer);
}

Answer 2

没关系,我找到了解决办法!这是初始化代码:

std::ifstream is;
is.open("Image.bmp", std::ios::binary);
is.seekg (0, std::ios::end);
length = is.tellg();
is.seekg (0, std::ios::beg);
pBuffer = new char [length];
is.read (pBuffer,length);
is.close();

tagBITMAPFILEHEADER bfh = *(tagBITMAPFILEHEADER*)pBuffer;
tagBITMAPINFOHEADER bih = *(tagBITMAPINFOHEADER*)(pBuffer+sizeof(tagBITMAPFILEHEADER));
RGBQUAD             rgb = *(RGBQUAD*)(pBuffer+sizeof(tagBITMAPFILEHEADER)+sizeof(tagBITMAPINFOHEADER));

BITMAPINFO bi;
bi.bmiColors[0] = rgb;
bi.bmiHeader = bih;

char* pPixels = (pBuffer+bfh.bfOffBits);

char* ppvBits;

hBitmap = CreateDIBSection(NULL, &bi, DIB_RGB_COLORS, (void**) &ppvBits, NULL, 0);
SetDIBits(NULL, hBitmap, 0, bih.biHeight, pPixels, &bi, DIB_RGB_COLORS);

GetObject(hBitmap, sizeof(BITMAP), &cBitmap);