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在linux下读取bmp文件头的完整代码。

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08/02
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呵呵，贴在这里记录一下。

[cpp] view plaincopy
  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. }