#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();  }