原创 C语言读写Jpg图片

jpg图片的起始为FF D8，结束为FF D9。没细研究。

#include "stdio.h"
/***********************************************************************************
* fp:  源图片，jpg->bin数据
 out: 输出图片的Ascii码
 dstFile:最终生成的图片 bin数据->jpg
***********************************************************************************/
int main()
{
 FILE *fp, *out,*dstFile;
 long int size;
 unsigned char ch,ch1,ch2;
 unsigned char high,low;
 long int i;
 char pic_name[30];
 for(i=0; i<30; i++)
 {
  pic_name = 0;
 }
 printf("\nPlease input the picture's name(such as vc.jpg)...\n");
 scanf("%s", pic_name);
 if((fp = fopen(pic_name, "rb")) == NULL)
 {
  printf("can't open the file\n");
  return 0;
 }
 if((out = fopen("JpgToBin.txt", "wb+")) == NULL)
 {
  printf("can't open the txt file\n");
  return 0;
 }
 if ((dstFile = fopen("Recv.jpg","wb+")) == NULL)
 {
  printf("can't open the dst file\n");
  return 0;
 }
 fseek(fp,0,SEEK_END);
 size = ftell(fp);
 printf("size is %d\n", size);
 rewind(fp);
 for (i=0; i<size; i++)
 {
  ch = fgetc(fp);
  high = ch >> 4;
  low = ch & 0x0f;
  if (high < 10)
   high += '0';
  else
   high += 55;
  if (low < 10)
   low += '0';
  else
   low += 55;
  fputc(high,out);  
  fputc(low, out);
  fputc(' ',out);
  if(i%16 == 0)
   fprintf(out,"\r\n");
 }