直接上代碼
11 int read_bmp(char* name, unsigned char* buff)
12 {
13 Image* image;
14 Rgbquad* quad;
15 Bitmapfileheader* fileheader;
16 Bitmapinfoheader* infoheader;
17 unsigned short filetype;
18 int num = 0;
19 FILE* pfile = NULL;
20 unsigned char pixel;
21 unsigned int offset;
22 image = (Image*)(malloc(sizeof(Image)));
23 if( !image )
24 {
25 perror("malloc()");
26 return -1;
27 }
28 fileheader = (Bitmapfileheader*)(malloc(sizeof(Bitmapfileheader)));
29 memset(fileheader, 0, sizeof(Bitmapfileheader));
30 infoheader = (Bitmapinfoheader*)(malloc(sizeof(Bitmapinfoheader)));
31 memset(infoheader, 0, sizeof(Bitmapinfoheader));
32 pfile = fopen(name, "rb");
33 if( !pfile )
34 {
35 perror("fopen()");
36 goto out;
37 }
38
39 num = fread( &filetype, sizeof(unsigned short), 1, pfile);
40 if( num )
41 {
42 // printf("filetype =%#x\n",filetype);
43 }else
44 goto out;
45
46 if( filetype == 0x4D42 )
47 {
48 num = fread( fileheader, sizeof(Bitmapfileheader), 1, pfile);
49 if( num < 0 ) goto out;
50 // printf("fileheader->bfsize=%u\n",fileheader->bfsize);
51 printf("fileheader->bfoffbits=%u\n",fileheader->bfoffbits);
52 offset = fileheader->bfoffbits;
53 num = fread( infoheader, sizeof(Bitmapinfoheader), 1, pfile);
54 if( num < 0) goto out;
55 // printf("infoheader->bisize=%u\n", infoheader->bisize);
56 image->width = infoheader->bitwidth;
57 image->height = infoheader->bitheight;
58 // printf("infoheader->bitwidth=%u\n",infoheader->bitwidth);
59 // printf("infoheader->bitheight=%u\n",infoheader->bitheight);
60 // printf("infoheader->biplanes=%u\n",infoheader->biplanes);
61 // printf("infoheader->bibitcount=%u\n",infoheader->bibitcount);
62 // printf("infoheader->bicompression=%u\n",infoheader->bicompression);
63 // printf("infoheader->biclrimportant=%#x\n",infoheader->biclrimportant);
64 }
65 // fseek(pfile, SEEK_SET, offset);
66 fseek(pfile, offset+1, SEEK_SET );
67 num = fread(buff, sizeof(unsigned char), (image->width)*(image->height)*2, pfile);
68 printf("num=%d\n",num);
69 goto out;
70 out:
71 free(image);
72 free(fileheader);
73 free(infoheader);
74 fclose(pfile);
75 return num;
76 }image.h定義bmp圖片頭數據結構1 #ifndef __IMAGE_BPEER__
2 #define __IMAGE_BPEER__
3
4 typedef struct {
5 // unsigned short bftype;
6 unsigned int bfsize;
7 unsigned short bfreserved1;
8 unsigned short bfreserved2;
9 unsigned int bfoffbits;
10 }Bitmapfileheader;
11
12 typedef struct {
13 unsigned int bisize;
14 unsigned int bitwidth;
15 unsigned int bitheight;
16 unsigned short biplanes;
17 unsigned short bibitcount;
18 unsigned int bicompression;
19 unsigned int bisizeimage;
20 unsigned int bixpelspermeter;
21 unsigned int biypelspermeter;
22 unsigned int biclrused;
23 unsigned int biclrimportant;
24 }Bitmapinfoheader;
25
26 typedef struct {
27 unsigned char rgbblue;
28 unsigned char rgbgreen;
29 unsigned char rgbred;
30 unsigned char rgbreserved;
31 }Rgbquad;
32
33 typedef struct {
34 int width;
35 int height;
36 int channel;
37 }Image;
38
39
40 int read_bmp(char* name, unsigned char* buff);
41
42
43 #endif
