bmp文件转jpg文件---获取bmp数据
FILE* pFile = fopen(pFilePath, "rb");if(pFile != NULL){int nClose = 1;BITMAPFILEHEADER bmpFileHeader = {0};if(fread(&bmpFileHeader, sizeof(bmpFileHeader), 1, pFile) == 1){BITMAPINFObmpInfo;if(fread(&bmpInfo, sizeof(bmpInfo)-4, 1, pFile) == 1){int nRgbDataLen = bmpInfo.bmiHeader.biWidth*abs(bmpInfo.bmiHeader.biHeight)*bmpInfo.bmiHeader.biBitCount/8;char* pRgbData = new char[nRgbDataLen+1];memset(pRgbData, 0, nRgbDataLen+1);if(fread(pRgbData, nRgbDataLen, 1, pFile) == 1){nClose = 0;fclose(pFile);int nBitBytes = bmpInfo.bmiHeader.biBitCount/8;//这里可以使用jpge的lib库把rgb转jpeg的函数进行转成jpeg文件}delete[] pRgbData;}}if(nClose == 1)fclose(pFile);}