ppm图片格式转换为bmp

#include <iostream> #include <string> #include <cstdlib> #include <fstream> #include <iomanip> using namespace std; int main(int argc, char * argv[]) { if (argc != 3) { cout << "please use this command like this: PPM2BMP.exe source.ppm result.bmp" << endl; return 0; } string PpmFileName(""); PpmFileName = argv[1]; ifstream InFile; ofstream OutFile; InFile.open(argv[1],ios::binary); OutFile.open(argv[2],ios::binary); string FileType; int Width, Height; int FileSize; int temp; InFile >> FileType >> Width >> Height >> temp; int FileDataSize = Width * Height * 3; FileSize = 0x36 + FileDataSize; temp = Width * Height; cout << FileType << 0x0A << Width << ' ' << Height; unsigned char bmphead[54] = {0x42,0x4d,0,0,0,0,0,0,0,0,0x36,0,0,0,0x28,0, 0,0,0,0,0,0,0,0,0,0,0x1,0,0x18,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; int FileSizeCount = 2; while (FileSize != 0) { bmphead[FileSizeCount++] = FileSize % 256; FileSize = FileSize / 256; } int FileDataCount = 0x22; while (FileDataSize != 0) { bmphead[FileDataCount++] = FileDataSize % 256; FileDataSize = FileDataSize / 256; } int FileScaleCount = 0x12; while (Width != 0) { bmphead[FileScaleCount++] = Width % 256; Width = Width / 256; } FileScaleCount = 0x16; while (Height != 0) { bmphead[FileScaleCount++] = Height % 256; Height = Height / 256; } for (int i=0; i<54; i++) OutFile << static_cast<unsigned char>(bmphead[i]); char color0,color1,color2; InFile.ignore(); for (int j=1; j<=temp; j++) { InFile.get(color0); InFile.get(color1); InFile.get(color2); OutFile << hex; OutFile.put(color2); OutFile.put(color1); OutFile.put(color0); } InFile.close(); OutFile.close(); return 0; }