讀取.bmp文件C++，錯誤的值？

Question

這是我從bmp文件中讀取的代碼（使用windows.h）。它從BITMAPFILEHEADER讀取正確的值，但從BITMAPINFOHEADER讀取的所有值都是40（十六進制中的28）。 有什麼問題？

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"; 

Answer 1

我打賭這個正在讀是正確的價值觀，它只是你總是輸出相同的字節一遍又一遍：

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)); 
...