差異處
這裏顯示兩個版本的差異處。
| Both sides previous revision 前次修改 下次修改 | 前次修改 | ||
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cpp:sc:queryservicelockstatus [2016/04/19 11:48] tony [Introduction] |
cpp:sc:queryservicelockstatus [2023/06/25 09:48] (目前版本) |
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| 行 1: | 行 1: | ||
| - | {{tag>cpp Windows}} | + | {{tag>cpp Windows SCM}} |
| ====== QueryServiceLockStatus ====== | ====== QueryServiceLockStatus ====== | ||
| ===== Introduction ===== | ===== Introduction ===== | ||
| 行 10: | 行 10: | ||
| 因此，我們可以先檢查SCM database是否lock，再決定我們接下來該怎麼做。 | 因此，我們可以先檢查SCM database是否lock，再決定我們接下來該怎麼做。 | ||
| ===== How to? ===== | ===== How to? ===== | ||
| + | 要解決這問題，可以使用: | ||
| + | * API: QueryServiceLockStatus。 | ||
| + | * Command line: sc querylock。 | ||
| + | 首先來看看QueryServiceLockStatus: | ||
| <code cpp> | <code cpp> | ||
| BOOL IsSCMRelease(){ | BOOL IsSCMRelease(){ | ||
| 行 20: | 行 24: | ||
| if (hSCManager) { | if (hSCManager) { | ||
| - | + | hStatus = (LPQUERY_SERVICE_LOCK_STATUS) LocalAlloc(LPTR, sizeof(QUERY_SERVICE_LOCK_STATUS)+256); | |
| - | QueryServiceLockStatus( hSCManager, hStatus, sizeof(QUERY_SERVICE_LOCK_STATUS)+256, &dwBytesNeeded); | + | if( hStatus == NULL ) { |
| - | + | clog << "LocalAlloc failed. Error: " << GetLastError() << endl; | |
| - | CloseServiceHandle(hSCManager); | + | |
| - | + | ||
| - | if(hStatus) { | + | |
| - | ret = hStatus->fIsLocked; | + | |
| - | LocalFree(hStatus); | + | |
| - | } else | + | |
| return FALSE; | return FALSE; | ||
| + | } | ||
| + | if( !QueryServiceLockStatus( hSCManager, hStatus, sizeof(QUERY_SERVICE_LOCK_STATUS)+256, &dwBytesNeeded)){ | ||
| + | clog << "Can't query lock status. Error: " << GetLastError() << endl; | ||
| + | ret = FALSE; | ||
| + | } else { | ||
| + | ret = hStatus->fIsLocked == 0; | ||
| + | } | ||
| + | |||
| + | CloseServiceHandle(hSCManager); | ||
| + | LocalFree(hStatus); | ||
| return ret; | return ret; | ||
| } | } | ||
| + | |||
| + | clog << "Can't open SCManager." << endl; | ||
| return FALSE; | return FALSE; | ||
| } | } | ||
| + | |||
| + | </code> | ||
| + | 若透過command line: | ||
| + | <code bash> | ||
| + | C:\Users\tonylin>chcp 437 & sc querylock | ||
| + | Active code page: 437 | ||
| + | [SC] QueryServiceLockStatus SUCCESS | ||
| + | IsLocked : FALSE | ||
| + | LockOwner : | ||
| + | LockDuration : 0 (seconds since acquired) | ||
| </code> | </code> | ||
| ===== Reference ===== | ===== Reference ===== | ||
| 行 41: | 行 61: | ||
| * [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms686321(v=vs.85).aspx|MSDN - StartService]] | * [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms686321(v=vs.85).aspx|MSDN - StartService]] | ||
| * [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms685104(v=vs.85).aspx|MSDN - SCM Handles]] | * [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms685104(v=vs.85).aspx|MSDN - SCM Handles]] | ||
| + | * [[http://www.tenouk.com/cpluscodesnippet/changewindowserviceconfig.html|sample code]] | ||
| + | * [[https://technet.microsoft.com/zh-tw/sqlserver/ms684953|QUERY_SERVICE_LOCK_STATUS structure]] | ||
| ===== ===== | ===== ===== | ||
| ---- | ---- | ||
| \\ | \\ | ||
| ~~DISQUS~~ | ~~DISQUS~~ | ||
