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