读取.bmp文件的c++，错误的值

reading a .bmp file c ++, wrong values?

本文关键字：错误 c++ 文件 读取 bmp      更新时间：2023-10-16

这是我从bmp文件读取的代码(使用windows.h)。它从BITMAPFILEHEADER读取正确的值，但是从BITMAPINFOHEADER读取的所有值都是40(十六进制28)。怎么了?

ifstream file("d3.bmp",ios::binary);
BITMAPFILEHEADER fheader;
BITMAPINFOHEADER aImg;
ofstream fileOut("newfile5.txt",ios::app);
file.read((char*)&fheader.bfType, sizeof(WORD));
fileOut<<std::hex<<fheader.bfType<<"n";
file.read((char*)&fheader.bfSize, sizeof(DWORD));
fileOut<<fheader.bfSize<<"n";
file.read((char*)&fheader.bfReserved1, sizeof(WORD));
fileOut<<fheader.bfReserved1<<"n";
file.read((char*)&fheader.bfReserved2, sizeof(WORD));
fileOut<<fheader.bfReserved2<<"n";
file.read((char*)&fheader.bfOffBits, sizeof(DWORD));
fileOut<<fheader.bfOffBits<<"n";

file.read((char*)&aImg.biSize,sizeof(DWORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biWidth, sizeof(LONG));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biHeight, sizeof(LONG));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biPlanes, sizeof(WORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biBitCount, sizeof(WORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biCompression, sizeof(DWORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biSizeImage, sizeof(DWORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biXPelsPerMeter, sizeof(LONG));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biYPelsPerMeter, sizeof(LONG));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biClrUsed, sizeof(DWORD));
fileOut<<aImg.biSize<<"n";
file.read((char*)&aImg.biClrImportant, sizeof(DWORD));
fileOut<<aImg.biSize<<"n";

我敢打赌读取的值是正确的，只是你总是一遍又一遍地输出相同的字节:

file.read((char*)&aImg.biSize,sizeof(DWORD));
fileOut<<aImg.biSize<<"n"; //ok, biSize
file.read((char*)&aImg.biWidth, sizeof(LONG));
fileOut<<aImg.biSize<<"n"; //wait, biSize again?
file.read((char*)&aImg.biHeight, sizeof(LONG));
fileOut<<aImg.biSize<<"n"; //well somehow I'm getting suspicious
file.read((char*)&aImg.biPlanes, sizeof(WORD));
fileOut<<aImg.biSize<<"n"; //...
file.read((char*)&aImg.biBitCount, sizeof(WORD));
...
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