请编写一个c++程序实现统计windows目录下的所有文件大小总和

好的，以下是实现统计Windows目录下所有文件大小总和的C程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>

long long int count_size(char *dir_path);

int main(int argc, char **argv)
{
    if (argc < 2)
    {
        printf("Usage: %s <directory path>\n", argv[0]);
        return 1;
    }

    char *dir_path = argv[1];
    long long int total_size = count_size(dir_path);

    printf("Total size of all files in %s: %lld bytes\n", dir_path, total_size);

    return 0;
}

long long int count_size(char *dir_path)
{
    DIR *dir = opendir(dir_path);
    if (dir == NULL)
    {
        printf("Error opening directory %s\n", dir_path);
        return -1;
    }

    long long int total_size = 0;
    struct dirent *entry;
    struct stat info;
    char *full_path = malloc(strlen(dir_path) + MAXNAMLEN + 2);

    while ((entry = readdir(dir)) != NULL)
    {
        if (entry->d_name[0] == '.')
            continue;

        strcpy(full_path, dir_path);
        strcat(full_path, "/");
        strcat(full_path, entry->d_name);

        if (stat(full_path, &info) == -1)
        {
            printf("Error getting information for file %s\n", full_path);
            continue;
        }

        if (S_ISDIR(info.st_mode))
        {
            long long int size = count_size(full_path);
            total_size += size;
            printf("Dir: %s, size: %lld bytes\n", full_path, size);
        }
        else if (S_ISREG(info.st_mode))
        {
            total_size += info.st_size;
            printf("File: %s, size: %lld bytes\n", full_path, info.st_size);
        }
    }

    free(full_path);
    closedir(dir);

    return total_size;
}

这个程序会递归遍历指定的目录，统计其中所有文件的大小，最终输出总大小。如果目录不存在或打开失败，会输出错误信息并返回-1。如果某个文件的信息获取失败，会输出错误信息并跳过该文件。对于每个文件和目录，程序会输出其路径和大小。