c语言实现图片复制

[sqsy109]

#include<stdio.h>
#include<stdlib.h>

int main(){
FILE *fp;
FILE *fp1;

char str[256];
gets(str);
if((fp=fopen(str,"rb+")) == NULL){
printf("ERROR");
getch();
exit(1);
}

if((fp1=fopen("d:\\cs\\cs.jpg","wt++")) ==NULL){
printf("error1");
getch();
exit(1);
}
fseek(fp,0L,SEEK_END);
long length;
long n,cpyfinish;
length = ftell(fp);
rewind(fp);

char pBuffer[1]={0};
unsigned char buff;


//while (!feof(fp))
while(length>0)
{
n = fread(pBuffer, 1, 1, fp);
cpyfinish =fwrite(pBuffer, 1, n, fp1);
length-=cpyfinish;
}


if(ferror(fp)){
puts("读取出错");
}else{
puts("读取成功");
}

fclose(fp);
fclose(fp1);

getch();
return 0;
}

为什么复制后的图片会不一样？？？

[醉花阴柳]

代码基本没做修改

#include<stdio.h>
#include<stdlib.h>

int main(){
    FILE *fp;
    FILE *fp1;

    char str[256];
    scanf("%s",str);
    if((fp=fopen(str,"rb+")) == NULL)
    {
        printf("ERROR");
        exit(1);
    }

    if((fp1=fopen("2.jpg","wt++")) ==NULL)
    {
        printf("error1");
        exit(1);
    }
    fseek(fp,0L,SEEK_END);
    long length;
    long n,cpyfinish;
    length = ftell(fp);
    rewind(fp);

    char pBuffer[1]={0};
//    unsigned char buff;


//while (!feof(fp))
    while(length>0)
    {
        n = fread(pBuffer, 1, 1, fp);
        cpyfinish =fwrite(pBuffer, 1, n, fp1);
        length-=cpyfinish;
    }


    if(ferror(fp))
        puts("读取出错");
    else
        puts("读取成功");

    fclose(fp);
    fclose(fp1);

    return 0;
}

[sqsy109]

我的电脑是win7 32位，难道是系统的问题吗？

[dustpg]

http://www.cplusplus.com/reference/cstdio/fopen/

[mxway]

fp1=fopen("d:\\cs\\cs.jpg","wt++")

改成

fp1=fopen("d:\\cs\\cs.jpg","wb++")

试下。以前也遇到过类似情况，对于图片的写入好像要用二进制方式写。

[赵4老师]

不要把 fopen("...","...");fscanf,fprintf,fgets,fgetc,fclose //读时把\r\n替换成\n，写时把\n替换成\r\n;读到\x1a就设置EOF;读写的内容当字符看待 和 fopen("...","...b");fseek,ftell,fread,fwrite,fgetc,fclose //不作以上替换，遇到\x1a仍继续读;读写的内容当字节看待 弄混了 推荐使用WinHex软件查看硬盘或文件或内存中的原始字节内容。