fread，fopen二进制打开图片并复制图片

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #define BYTE unsigned char
 5 int main(){
 6     BYTE *buffer;
 7 
 8     FILE *pixmap = fopen("./temp.png","rb");
 9 
10     fseek(pixmap,0, SEEK_END);
11 
12     
13     int length = ftell(pixmap);//读取图片的大小长度
14     FILE *fp = fopen("./t.png","wb");
15 
16     buffer = (BYTE *)malloc(length*sizeof(BYTE));
17 
18     fseek(pixmap, 0, SEEK_SET);//把光标设置到文件的开头
19 
20     while(0 !=fread(buffer,sizeof(BYTE),length,pixmap))
21     {
22             printf("%s\n----%ld",buffer,strlen(buffer));
23             fwrite(buffer,sizeof(BYTE),length,fp);
24     }
25 
26     fclose(pixmap);
27     fclose(fp);
28 }