使用windows api

输入：盘符字符串

输出：磁盘容量

 

float get_disk_spaces(const char drive_letter, float & total_space, float & used_space){    BOOL fResult;    unsigned _int64 i64FreeBytesToCaller;    unsigned _int64 i64TotalBytes;    unsigned _int64 i64FreeBytes;    char dir[4] = { drive_letter, ':', '\\', '\0'};    fResult = GetDiskFreeSpaceExA(        dir,        (PULARGE_INTEGER)&i64FreeBytesToCaller,        (PULARGE_INTEGER)&i64TotalBytes,        (PULARGE_INTEGER)&i64FreeBytes);    if (fResult)    {        /*QMessageBox::about(NULL, "Information",            ("Get disk space " + QString(dir) + QString::number(i64TotalBytes)));*/        total_space = (float)i64TotalBytes;        used_space = (float)(i64TotalBytes - i64FreeBytes);        return (float)i64TotalBytes;    }    else        QMessageBox::about(NULL, "Information",            ("Failed to get disk space " + QString(dir)));     return -1;}

 

注意其中的字符数组 dir 一定要以'\0'结尾，否则程序时好时坏，因为有时dir末尾正好是0，而有时不是。