VC裁剪bmp

#include <atlimage.h>#include <gdiplus.h>#include <fstream>using namespace cv;using namespace std;typedef struct mw_Rect{int x ;int y ;int width ;int height ;}mw_Rect;/*****************************************************功能：输入bmp字节流，按照指定大小区域裁剪输出bmp字节流参数：bmp[in]需要裁剪的bmp字节流（包含头信息的完整bmp）len[in]需要裁剪的bmp字节流的长度lenOut[out]裁剪出来的bmp字节流长度rect[in]裁剪的区域大小矩形框返回值：返回裁剪处理啊的bmp字节流，包含头信息，直接写到文件中就是一个bmp文件*****************************************************/unsigned char* CutImg2(unsigned char *bmp , int len , int *lenOut , mw_Rect rect){int lbx, lby, cutwidth, cutheight;lbx=rect.x;//²Ã¼ôÆðʼλÖã¨×óϽÇ×ø±êϵ£©lby=rect.y;//cutwidth=rect.width;//²Ã¼ôµÄ¿í¶Ècutheight=rect.height;//²Ã¼ôµÄ¸ß¶ÈBITMAPFILEHEADER myfileHdr; BITMAPINFOHEADER mySinfo,myDinfo; memcpy_s(&myfileHdr , sizeof(myfileHdr) , bmp , sizeof(myfileHdr));memcpy_s(&mySinfo , sizeof(mySinfo) , bmp+sizeof(myfileHdr) , sizeof(mySinfo));DWORD dwSize = (mySinfo.biWidth * mySinfo.biBitCount + 31) / 32 * 4 * mySinfo.biHeight;PBYTE pBufs = new BYTE[dwSize];memcpy_s(pBufs , dwSize , bmp+sizeof(myfileHdr)+sizeof(mySinfo) , dwSize);DWORD dwSize1 = (cutwidth * 24 + 31) / 32 * 4 *cutheight; //¼ÆËãÄ¿µÄÎļþλͼÊý¾ÝµÄ´óСDWORD dwDIBSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + dwSize1; DWORD dwSize2 = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER);myfileHdr.bfType = 0x4D42; // "BM"myfileHdr.bfSize = dwDIBSize; myfileHdr.bfReserved1 = 0; myfileHdr.bfReserved2 = 0; myfileHdr.bfOffBits = dwSize2;myDinfo.biWidth = cutwidth; //ÉèÖÃÄ¿µÄÎļþµÄ¿í¶ÈmyDinfo.biHeight = cutheight; //ÉèÖÃÄ¿µÄÎļþµÄ¸ß¶ÈmyDinfo.biSize   = sizeof(BITMAPINFOHEADER);myDinfo.biPlanes   = 1;myDinfo.biBitCount = 24;myDinfo.biCompression = BI_RGB;myDinfo.biSizeImage = 0;myDinfo.biXPelsPerMeter = 0;myDinfo.biYPelsPerMeter = 0;myDinfo.biClrImportant = 0;myDinfo.biClrUsed = 0;PBYTE pBufd = new BYTE[dwSize1]; //ÉùÃ÷Ä¿µÄÎļþλͼÐÅÏ¢Äڴ滺³åÇøBYTE *pSrc, *pDes;int j=0;for(int i = lby; i < myDinfo.biHeight + lby; i++) {       pSrc = pBufs + (mySinfo.biWidth * mySinfo.biBitCount + 31) / 32 * 4 * i + lbx * 3; //Ö¸¶¨×ø±êµãµÄ¶¨Î»      pDes = pBufd + (myDinfo.biWidth * myDinfo.biBitCount + 31) / 32 * 4 * j;        memcpy(pDes, pSrc, (myDinfo.biWidth * myDinfo.biBitCount + 31) / 32 * 4);       j++;  //::MessageBox(NULL,pSrc,"aaaa",MB_OK|MB_ICONINFORMATION);}*lenOut = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwSize1;unsigned char *cutImg = new unsigned char[sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwSize1];memset(cutImg,0,sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+dwSize1);memcpy_s(cutImg , sizeof(BITMAPFILEHEADER) , &myfileHdr , sizeof(BITMAPFILEHEADER));memcpy_s(cutImg+sizeof(BITMAPFILEHEADER) , sizeof(BITMAPINFOHEADER) , &myDinfo , sizeof(BITMAPINFOHEADER));memcpy_s(cutImg+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER) , dwSize , pBufd , dwSize1);delete[] pBufs;pBufs = NULL;delete[] pBufd;pBufd = NULL;return cutImg;}