C语言实现查看一个文件夹目录里面所有内容的大小功能

第一种方法：
                     DIR *d; 
struct dirent *de; 
struct stat buf; 
  INT32 exists; 
INT64 total_size; 
d = opendir("."); 
if (d == NULL) 
{ 
   perror("prsize"); 
   exit(1); 
} 
total_size = 0; 
for (de = readdir(d); de != NULL; de = readdir(d)) 
{ 
exists = stat(de->d_name, &buf); 
if (exists < 0) 
{ 
fprintf(stderr, "Couldn't stat %s\n", de->d_name); 
} 
else 
{ 
total_size += buf.st_size; 
} 
} 
  closedir(d); 

  printf("%d\n", total_size); 
第二中方法：
FILE *fp;
    CHAR databuff[1024] = {0};
    CHAR *pstr = NULL;
    INT32    file_size = -1;
    sprintf(databuff, "du -sh  %s/%s/compress_%s/",WORK_DIR_PATH,LOG_DIR_PATH,logname);
printf("\n**************aaaaaaaaaaaaaaaaaaaaaaaaaa***********\n");
    fp  = popen(databuff, "r");

    if (fp == NULL)
    {
        pclose(fp);
        return -1;
    }
printf("\n**************1bbbbbbbbbbbbbbbbbbbbbb***********\n");

    if (fgets(databuff, sizeof(databuff), fp) != NULL && !(ferror(fp)))
    {
        pstr = strstr(databuff, "M");

        if (pstr != NULL)
        {
            file_size = (int)(atoi(databuff) * 1);
        }
    }
    else
    {
        return -1;
    }

    pclose(fp);
printf("\n**************=%04d***%04d K******\n",file_size,file_size/1024);
    return file_size;