从位图数据取得位图句柄

#include <windows.h>
#include <fstream>
using namespace std;  

void main()
{
    ifstream infile("bm.bmp", ios::in | ios::binary);  

    BITMAPFILEHEADER bmpHeader;
    // 获取文件大小
    infile.seekg(0, ios::end);
    long nfilelen = infile.tellg();
    infile.seekg(0, ios::beg);  

    // 读取文件头
    infile.read((char*)&bmpHeader, sizeof(bmpHeader));
    if (bmpHeader.bfType != 0x4d42)
        return ;  

    // 占用一块内存
    HGLOBAL hDIB = GlobalAlloc(GMEM_FIXED, nfilelen);
    if (hDIB == 0)
        return ;  

    // 把文件写入DIB
    infile.read((char*)hDIB, nfilelen - sizeof(BITMAPFILEHEADER));  

    // 锁定内存, 位图信息指向该内存
    // BITMAPINFO == 位图信息头 + 调色板
    BITMAPINFO &bmpInfo = *(BITMAPINFO*)GlobalLock(hDIB);
    // 位图信息头指向该内存
    // BITMAPINFOHEADER *pInfoHead = (BITMAPINFOHEADER*)hDIB;  

    // 位图信息头大小
    // int nHeadSize = sizeof(BITMAPINFOHEADER);
    // 获取颜色数组
    BYTE *pBmpPixelBuffer=(BYTE *)&bmpInfo + bmpHeader.bfOffBits - sizeof(BITMAPFILEHEADER);  

    HDC hDC = GetDC(NULL);
    HBITMAP hBitmap;
    hBitmap=CreateDIBitmap(hDC,(BITMAPINFOHEADER *)&bmpInfo,
        CBM_INIT,(VOID *)pBmpPixelBuffer,&bmpInfo,DIB_RGB_COLORS);  

    HDC memDC;
    memDC = CreateCompatibleDC(hDC);
    SelectObject(memDC, hBitmap);
    BitBlt(hDC, 0, 0, 500, 500, memDC, 0, 0, SRCCOPY);  

    DeleteDC(memDC);
    GlobalFree(hDIB);
    infile.close();
}  

http://blog.csdn.net/mmc1206x/article/details/8686822