在linux下读取bmp文件头的完整代码。

呵呵，贴在这里记录一下。

1. #include<stdio.h>  
2. #include<string.h>  
3. #include<sys/types.h>  
4.   
5. #include <iostream>  
6.   
7. #pragma pack(2)  
8.   
9. using namespace std;  
10.   
11. //下面两个结构是位图的结构  
12. typedef struct BITMAPFILEHEADER  
13. {   
14.     u_int16_t bfType;   
15.     u_int32_t bfSize;   
16.     u_int16_t bfReserved1;   
17.     u_int16_t bfReserved2;   
18.     u_int32_t bfOffBits;   
19. }BITMAPFILEHEADER;   
20.   
21. typedef struct BITMAPINFOHEADER  
22. {   
23.     u_int32_t biSize;   
24.     u_int32_t biWidth;   
25.     u_int32_t biHeight;   
26.     u_int16_t biPlanes;   
27.     u_int16_t biBitCount;   
28.     u_int32_t biCompression;   
29.     u_int32_t biSizeImage;   
30.     u_int32_t biXPelsPerMeter;   
31.     u_int32_t biYPelsPerMeter;   
32.     u_int32_t biClrUsed;   
33.     u_int32_t biClrImportant;   
34. }BITMAPINFODEADER;  
35.   
36. void showBmpHead(BITMAPFILEHEADER &pBmpHead){    
37.     cout<<"位图文件头:"<<endl;    
38.     cout<<"文件头类型:"<<pBmpHead.bfType<<endl;    
39.     cout<<"文件大小:"<<pBmpHead.bfSize<<endl;    
40.     cout<<"保留字_1:"<<pBmpHead.bfReserved1<<endl;    
41.     cout<<"保留字_2:"<<pBmpHead.bfReserved2<<endl;    
42.     cout<<"实际位图数据的偏移字节数:"<<pBmpHead.bfOffBits<<endl<<endl;    
43. }    
44.     
45. void showBmpInforHead(BITMAPINFODEADER &pBmpInforHead){    
46.     cout<<"位图信息头:"<<endl;    
47.     cout<<"结构体的长度:"<<pBmpInforHead.biSize<<endl;    
48.     cout<<"位图宽:"<<pBmpInforHead.biWidth<<endl;    
49.     cout<<"位图高:"<<pBmpInforHead.biHeight<<endl;    
50.     cout<<"biPlanes平面数:"<<pBmpInforHead.biPlanes<<endl;    
51.     cout<<"biBitCount采用颜色位数:"<<pBmpInforHead.biBitCount<<endl;    
52.     cout<<"压缩方式:"<<pBmpInforHead.biCompression<<endl;    
53.     cout<<"biSizeImage实际位图数据占用的字节数:"<<pBmpInforHead.biSizeImage<<endl;    
54.     cout<<"X方向分辨率:"<<pBmpInforHead.biXPelsPerMeter<<endl;    
55.     cout<<"Y方向分辨率:"<<pBmpInforHead.biYPelsPerMeter<<endl;    
56.     cout<<"使用的颜色数:"<<pBmpInforHead.biClrUsed<<endl;    
57.     cout<<"重要颜色数:"<<pBmpInforHead.biClrImportant<<endl;    
58. }   
59.   
60. int main( int argc, char **argv )  
61. {  
62.     FILE *fp = fopen(argv[1], "rb");  
63.   
64.     BITMAPFILEHEADER head;  
65.     BITMAPINFODEADER info;  
66.   
67.     fread(&head, 1, sizeof(BITMAPFILEHEADER), fp);  
68.     fread(&info, 1, sizeof(BITMAPINFODEADER), fp);  
69.   
70.     showBmpHead(head);  
71.     showBmpInforHead(info);  
72.   
73.     cout<<sizeof(BITMAPFILEHEADER)<<endl; cout<<sizeof(BITMAPINFODEADER)<<endl;   
74.   
75.     fclose(fp);  
76.   
77.     return 0;  
78. }