在linux下读取bmp文件头的完整代码。

呵呵，贴在这里记录一下。

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#include<stdio.h>
#include<string.h>
#include<sys/types.h>
#include <iostream>
#pragma pack(2)
using namespace std;
//下面两个结构是位图的结构
typedef struct BITMAPFILEHEADER
{
u_int16_t bfType;
u_int32_t bfSize;
u_int16_t bfReserved1;
u_int16_t bfReserved2;
u_int32_t bfOffBits;
}BITMAPFILEHEADER;
typedef struct BITMAPINFOHEADER
{
u_int32_t biSize;
u_int32_t biWidth;
u_int32_t biHeight;
u_int16_t biPlanes;
u_int16_t biBitCount;
u_int32_t biCompression;
u_int32_t biSizeImage;
u_int32_t biXPelsPerMeter;
u_int32_t biYPelsPerMeter;
u_int32_t biClrUsed;
u_int32_t biClrImportant;
}BITMAPINFODEADER;
void showBmpHead(BITMAPFILEHEADER &pBmpHead){
cout<<"位图文件头:"<<endl;
cout<<"文件头类型:"<<pBmpHead.bfType<<endl;
cout<<"文件大小:"<<pBmpHead.bfSize<<endl;
cout<<"保留字_1:"<<pBmpHead.bfReserved1<<endl;
cout<<"保留字_2:"<<pBmpHead.bfReserved2<<endl;
cout<<"实际位图数据的偏移字节数:"<<pBmpHead.bfOffBits<<endl<<endl;
}
void showBmpInforHead(BITMAPINFODEADER &pBmpInforHead){
cout<<"位图信息头:"<<endl;
cout<<"结构体的长度:"<<pBmpInforHead.biSize<<endl;
cout<<"位图宽:"<<pBmpInforHead.biWidth<<endl;
cout<<"位图高:"<<pBmpInforHead.biHeight<<endl;
cout<<"biPlanes平面数:"<<pBmpInforHead.biPlanes<<endl;
cout<<"biBitCount采用颜色位数:"<<pBmpInforHead.biBitCount<<endl;
cout<<"压缩方式:"<<pBmpInforHead.biCompression<<endl;
cout<<"biSizeImage实际位图数据占用的字节数:"<<pBmpInforHead.biSizeImage<<endl;
cout<<"X方向分辨率:"<<pBmpInforHead.biXPelsPerMeter<<endl;
cout<<"Y方向分辨率:"<<pBmpInforHead.biYPelsPerMeter<<endl;
cout<<"使用的颜色数:"<<pBmpInforHead.biClrUsed<<endl;
cout<<"重要颜色数:"<<pBmpInforHead.biClrImportant<<endl;
}
int main( int argc, char **argv )
{
FILE *fp = fopen(argv[1], "rb");
BITMAPFILEHEADER head;
BITMAPINFODEADER info;
fread(&head, 1, sizeof(BITMAPFILEHEADER), fp);
fread(&info, 1, sizeof(BITMAPINFODEADER), fp);
showBmpHead(head);
showBmpInforHead(info);
cout<<sizeof(BITMAPFILEHEADER)<<endl; cout<<sizeof(BITMAPINFODEADER)<<endl;
fclose(fp);
return 0;
}