如果BITMAPFILEHEADER.bfSize的值不匹配实际文件大小可能会导致文件无法正常打开。一般来说,这种问题通常出现在读取BMP文件时。解决方法是使用C/C++编程语言中的结构体。可以使用以下代码片段来读取BMP文件并解决该问题:
#include
#include
using namespace std;
#pragma pack(push, 1)
struct BITMAPFILEHEADER {
unsigned short bfType;
unsigned int bfSize;
unsigned short bfReserved1;
unsigned short bfReserved2;
unsigned int bfOffBits;
};
struct BITMAPINFOHEADER {
unsigned int biSize;
int biWidth;
int biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
int biXPelsPerMeter;
int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
};
#pragma pack(pop)
int main()
{
BITMAPFILEHEADER bfh;
BITMAPINFOHEADER bih;
ifstream fin("example.bmp", ios::binary);
if (!fin.is_open())
{
cerr << "Can't open file" << endl;
return -1;
}
fin.read((char *)&bfh, sizeof(bfh));
fin.read((char *)&bih, sizeof(bih));
if (bfh.bfSize != 54 + bih.biSizeImage)
{
cerr << "Filesize mismatch" << endl;
return -1;
}
// Continue reading and processing the BMP file here...
fin.close();
return 0;
}
以上示例中,“example.bmp”是要读取的BMP文件的名称。此示例使用fstream和iostream库来读取BMP文件的文件头,并确保文件大小匹配。如果BITMAPFILEHEADER.bfSize和实际文件大小不匹配,程序将输出“Filesize mismatch”的错误消息,并返回-1表示程序异常结束。