差異處
這裏顯示兩個版本的差異處。
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cpp:sc:queryservicelockstatus [2016/04/19 11:48] tony [How to?] |
cpp:sc:queryservicelockstatus [2023/06/25 09:48] |
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| - | {{tag>cpp Windows}} | ||
| - | ====== QueryServiceLockStatus ====== | ||
| - | ===== Introduction ===== | ||
| - | 某些third-party api會在runtime去新增service，以減少使用者在安裝上的負擔。然而在系統重新啟動時，SCM會lock service database，如果新增service將會造成block。此源自: [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms686321(v=vs.85).aspx|link]] | ||
| - | <code> | ||
| - | A service cannot call StartService during initialization. The reason is that the SCM locks the' | ||
| - | service control database during initialization, so a call to StartService will block. After the | ||
| - | service reports to the SCM that it has successfully started, it can call StartService. | ||
| - | </code> | ||
| - | ===== How to? ===== | ||
| - | <code cpp> | ||
| - | BOOL IsSCMRelease(){ | ||
| - | SC_HANDLE hSCManager; | ||
| - | LPQUERY_SERVICE_LOCK_STATUS hStatus; | ||
| - | DWORD dwBytesNeeded; | ||
| - | BOOL ret; | ||
| - | |||
| - | hSCManager=OpenSCManager(NULL, NULL, SC_MANAGER_QUERY_LOCK_STATUS); | ||
| - | |||
| - | if (hSCManager) { | ||
| - | |||
| - | QueryServiceLockStatus( hSCManager, hStatus, sizeof(QUERY_SERVICE_LOCK_STATUS)+256, &dwBytesNeeded); | ||
| - | |||
| - | CloseServiceHandle(hSCManager); | ||
| - | |||
| - | if(hStatus) { | ||
| - | ret = hStatus->fIsLocked; | ||
| - | LocalFree(hStatus); | ||
| - | } else | ||
| - | return FALSE; | ||
| - | |||
| - | return ret; | ||
| - | } | ||
| - | |||
| - | return FALSE; | ||
| - | } | ||
| - | </code> | ||
| - | ===== Reference ===== | ||
| - | * [[https://msdn.microsoft.com/zh-tw/library/windows/desktop/ms684938(v=vs.85).aspx|MSDN - QueryServiceLockStatus]] | ||
| - | * [[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]] | ||
| - | ===== ===== | ||
| - | ---- | ||
| - | \\ | ||
| - | ~~DISQUS~~ | ||
