拷贝一般文件
main(int arg, char *args[]) {
if (arg < 3)
return -1;
const char *srcFile = args[1];
const char *desFile = args[2];
FILE *psrc = fopen(srcFile, "r"); //用只读方式读取源文件
if (psrc == NULL) {
printf("%s:%s open failed\n", srcFile, strerror(errno));
return -1;
}
FILE *pdesc = fopen(desFile, "w"); //用只读方式读取源文件
if (psrc == NULL) {
printf("%s:%s open failed\n", desFile, strerror(errno));
return -1;
}
struct stat st;
memset(&st, 0, sizeof(st));
if (stat(srcFile, &st) == -1) {
printf("stat failed");
return -1;
}
char *buf = malloc(st.st_size); //根据源文件的实际大小,动态分配一块内存空间
size_t rc = fread(buf, 1, st.st_size, psrc);
fwrite(buf, 1, rc, pdesc); //源文件内容写入
fclose(psrc);
fclose(pdesc);
free(buf);
return 0;
}
拷贝大文件
int main(int arg, char *args[]) {
if (arg < 3)
return -1;
const char *srcFile = args[1];
const char *desFile = args[2];
FILE *psrc = fopen(srcFile, "r"); //用只读方式读取源文件
if (psrc == NULL) {
printf("%s:%s open failed\n", srcFile, strerror(errno));
return -1;
}
FILE *pdesc = fopen(desFile, "w"); //用只读方式读取源文件
if (psrc == NULL) {
printf("%s:%s open failed\n", desFile, strerror(errno));
return -1;
}
struct stat st;
memset(&st, 0, sizeof(st));
if (stat(srcFile, &st) == -1) {
printf("stat failed");
return -1;
}
char buf[1024]
//根据源文件的实际大小,动态分配一块内存空间
while (1) {
size_t rc = fread(buf, 1, sizeof(buf), psrc);
if (rc <= 0) {
break;
}
fwrite(buf, 1, rc, pdesc);
}
fwrite(buf, 1, rc, pdesc); //源文件内容写入
fclose(psrc);
fclose(pdesc);
free(buf);
return 0;
}
