vc 查看硬盘盘符剩余空间

1. string strtemp = "c:\\123\\456\\789.txt";  
2.     char uuu[2] = {0};  
3.     uuu [0]= strtemp[0];  
4.     CString firstchar = uuu;  
5.     CString strRootPath=firstchar + ":\\";  
6.     /*CString strRootPath="E:\\123.txt";*///带根目录标记的磁盘符号  
7.     DWORD dwSectorsPerCluster=0;//每簇中扇区数  
8.     DWORD dwBytesPerSector=0;//每扇区中字节数  
9.     DWORD dwFreeClusters=0;//剩余簇数  
10.     DWORD dwTotalClusters=0;//总簇数  
11.     if (GetDiskFreeSpace(strRootPath,&dwSectorsPerCluster,&dwBytesPerSector,  
12.         &dwFreeClusters,&dwTotalClusters))  
13.     {  
14.         //m_dwVolSize=dwTotalClusters*dwSectorsPerCluster*dwBytesPerSector;//不能这样，否则越界  
15.         double dd=dwSectorsPerCluster*dwBytesPerSector/(1024.*1024.);  
16.         dd=dd/1024.;  
17.         double m_dFree=dwFreeClusters*dd;//该磁盘剩余容量总大小  
18.         if (m_dFree < 1)  
19.         {  
20.             WriteToLogAndTime("硬盘空间小于1G，请清理空间");  
21.             AfxMessageBox("硬盘空间小于1G，请清理空间");  
22.         }  
23.     }