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在2K以上系統中掛載盤符（設置盤符） 收藏
????? 昨天，在CSDN中看見帖子尋求解決掛載盤符的問題，今天把它搞定了。
????? 改變盤符主要是用SetVolumeMountPoint和DeleteVolumeMountPoint 兩個函數。DeleteVolumeMountPoint 很簡單就不多說了。SetVolumeMountPoint 的使用主要是要找到被掛載設備的VolumeName。但是設備被卸載以后用GetVolumeNameForVolumeMountPoint根本取不到VolumeName，怎么辦呢？
????? 微軟XP的系統文件夾里面有一個叫diskpart.exe的命令行工具，用它可以改變盤符。那么它是怎么做到的呢？簡單的分析（用VC6自帶的工具DEPENDS.EXE）就可以看見這個程序使用了很多Setup API函數，我判斷使用SetupDiEnumDeviceInfo來取得VolumeName的ClassGUID，但是結果發現取到的ClassGUID和用GetVolumeNameForVolumeMountPoint獲取的沒有卸載前的VolumeName中的ClassGUID不一樣。怎么辦呢？
????? 沒關系，讓我們祭出屠龍刀：IDA Pro。如何反匯編分析不在本文的介紹了（挺麻煩，而我這人又比較懶嘿嘿）。我一陣海扁它，發現關鍵是要通過DefineDosDevice 函數將設備Attach到盤符上，然后用GetVolumeNameForVolumeMountPoint取到VolumeName，之后就可以用SetVolumeMountPoint將設備掛載到盤符上了。我把它寫成了函數如果要加載盤符就可以使用（前提是盤符未被占用）：
ChangeMountPoint( _T("H:\\"), _T("\\\Device\\HarddiskVolume2"),true);卸載的話用：
ChangeMountPoint( _T("H:\\"),NULL, false);下面是ChangeMountPoint函數的實現：

bool ChangeMountPoint(LPCTSTR lpDriveLetter,LPCTSTR lpDevice,bool bAddMountPoint)
{
??? bool bRet = false;
??? TCHAR szDriveLetterAndSlash[4] = {0};
??? TCHAR szDriveLetter[3] = {0};
??? TCHAR szUniqueVolumeName[MAX_PATH] = {0};
??? if(lpDriveLetter && lpDevice)
??? {
??????? szDriveLetter[0] = lpDriveLetter[0];
??????? szDriveLetter[1] = TEXT(':');
??????? szDriveLetter[2] = TEXT('\0');
???????
??????? szDriveLetterAndSlash[0] = lpDriveLetter[0];
??????? szDriveLetterAndSlash[1] = TEXT(':');
??????? szDriveLetterAndSlash[2] = TEXT('\\');
??????? szDriveLetterAndSlash[3] = TEXT('\0');
??????? if ( bAddMountPoint )
??????? {
??????????? //Try to Attach lpDevice to lpDriveLetter
??????????? bRet = DefineDosDevice (DDD_RAW_TARGET_PATH, szDriveLetter,
??????????????? lpDevice);
???????????
??????????? if (bRet)
??????????? {
??????????????? if (!GetVolumeNameForVolumeMountPoint (szDriveLetterAndSlash,
??????????????????? szUniqueVolumeName,
??????????????????? MAX_PATH))
??????????????? {
??????????????????? //Can't Find Attached lpDevice 's VolumeName
??????????????????? szUniqueVolumeName[0] = '\0';
??????????????? }
???????????????
??????????????? bRet = DefineDosDevice (
??????????????????? DDD_RAW_TARGET_PATH|DDD_REMOVE_DEFINITION|
??????????????????? DDD_EXACT_MATCH_ON_REMOVE, szDriveLetter,
??????????????????? lpDevice);
???????????????
??????????????? if (!bRet)
??????????????????? return bRet;
???????????????
??????????????? bRet = SetVolumeMountPoint(szDriveLetterAndSlash,
??????????????????? szUniqueVolumeName);
??????????? }
??????? }
??????? else
??????? {
??????????? bRet = DeleteVolumeMountPoint (szDriveLetterAndSlash);
??????? }
??? }
???
??? return bRet;
}

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