获取磁盘使用空间和剩余空间

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原创最新推荐文章于 2026-07-06 10:04:43 发布 986 阅读 AI 写同款· GEO 优化 ›

QT中获取磁盘可用空间在我们写项目时，不可避免要保存数据、图片什么的，积累多了磁盘就满了，最近做的项目就是需要保存图片，其中就需要监控磁盘是否还够用，以便清空图片数据。对于获取系统磁盘，Windows系统已经提供了API来获取(如下)，代码在WinBase.h中，我们在编码时需要把<windows.h>头文件包含进去 GetDiskFreeSpaceExW( __in_opt LPCW... 阅读详情

char crDrv[3];
CStringArray strArray;
_ULARGE_INTEGER  n64TotalNumberOfBytes,
n64TotalNumberOfFreeBytes;
__int64  n64TotalFree = 0,n64TotalSpace = 0;
float fTotalFree,fTotalSpace,fTempFree,fTempTotal;
ULONG  lTotalFree = 0,lTotalSpace = 0,
   lTempFree = 0,lTempTotal = 0;
CString strInfo;
BOOL bSuccess;

for(int n=2;n<=25;n++)
{
CString str;
str.Format("%c://",n+'A');
strcpy(crDrv,str);
UINT nDrvType = GetDriveType(crDrv);
switch(nDrvType)
{
case DRIVE_FIXED:
{
strArray.Add(crDrv);
break;
}
default:
{
break;
}
}
}

for(n = 0;n < strArray.GetSize();n ++)
{
bSuccess = SHGetDiskFreeSpace(strArray.GetAt(n),
NULL,&n64TotalNumberOfBytes,
&n64TotalNumberOfFreeBytes);
n64TotalSpace += n64TotalNumberOfBytes.QuadPart;
n64TotalFree += n64TotalNumberOfFreeBytes.QuadPart;

lTempTotal = (ULONG)(n64TotalNumberOfBytes.QuadPart/1024);
lTempFree = (ULONG)(n64TotalNumberOfFreeBytes.QuadPart/1024);
fTempTotal = (float)lTempTotal;
fTempTotal = fTempTotal/1024/1024;
fTempFree = (float)lTempFree;
fTempFree = fTempFree/1024/1024;

strInfo.Format("%s 容量: %4.2fGB,可用空间: %4.2fGB.",
strArray.GetAt(n),fTempTotal,fTempFree);
AfxMessageBox(strInfo);
}

lTotalSpace = (ULONG)(n64TotalSpace/1024);
lTotalFree = (ULONG)(n64TotalFree/1024);
fTotalSpace = (float)lTotalSpace;
fTotalSpace = fTotalSpace/1024/1024;
fTotalFree = (float)lTotalFree;
fTotalFree = fTotalFree/1024/1024;

strInfo.Format("总容量: %4.2fGB,总共可用空间: %4.2fGB.",
fTotalSpace,fTotalFree);
AfxMessageBox(strInfo);