QueryServiceConfig

最新推荐文章于 2022-08-18 10:58:47 发布

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#service #function #parameters #access #buffer #windows

本文介绍了QueryServiceConfig函数，该函数用于检索指定服务的配置参数，还可通过QueryServiceConfig2获取可选配置参数。文中说明了函数的参数、返回值，指出若函数失败返回零，可调用GetLastError获取错误信息，同时阐述了函数的相关备注和示例代码等内容。

QueryServiceConfig

The QueryServiceConfig function retrieves the configuration parameters of the specified service. Optional configuration parameters are available using the QueryServiceConfig2 function.

BOOL QueryServiceConfig(
  SC_HANDLE hService,
  LPQUERY_SERVICE_CONFIG lpServiceConfig,
  DWORD cbBufSize,
  LPDWORD pcbBytesNeeded
);

Parameters

hService

[in] Handle to the service. This handle is returned by the OpenService or CreateService function, and it must have the SERVICE_QUERY_CONFIG access right. For more information, see Service Security and Access Rights.

lpServiceConfig

[out] Pointer to a buffer that receives the service configuration information. The format of the data is a QUERY_SERVICE_CONFIG structure.

The maximum size of this array is 8K bytes. To determine the required size, specify NULL for this parameter and 0 for the cbBufSize parameter. The function will fail and GetLastError will return ERROR_INSUFFICIENT_BUFFER. The pcbBytesNeeded parameter will receive the required size.

cbBufSize

[in] Size of the buffer pointed to by the lpServiceConfig parameter, in bytes.

pcbBytesNeeded

[out] Pointer to a variable that receives the number of bytes needed to store all the configuration information, if the function fails with ERROR_INSUFFICIENT_BUFFER.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

The following error codes can be set by the service control manager. Others can be set by the registry functions that are called by the service control manager.

Return code	Description
ERROR_ACCESS_DENIED	The handle does not have the SERVICE_QUERY_CONFIG access right.
ERROR_INSUFFICIENT_BUFFER	There is more service configuration information than would fit into the lpServiceConfig buffer. The number of bytes required to get all the information is returned in the pcbBytesNeeded parameter. Nothing is written to lpServiceConfig.
ERROR_INVALID_HANDLE	The specified handle is invalid.

Remarks

The QueryServiceConfig function returns the service configuration information kept in the registry for a particular service. This configuration information is first set by a service control program using the CreateService function. This information may have been updated by a service configuration program using the ChangeServiceConfig function.

If the service was running when the configuration information was last changed, the information returned by QueryServiceConfig will not reflect the current configuration of the service. Instead, it will reflect the configuration of the service when it is next run. The DisplayName key is an exception to this. When the DisplayName key is changed, it takes effect immediately, regardless of whether the service is running.

Example Code

For an example, see Querying a Service's Configuration.

Requirements

Client	Requires Windows XP, Windows 2000 Professional, or Windows NT Workstation.
Server	Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server.
Header	Declared in Winsvc.h; include Windows.h.
Library	Link to Advapi32.lib.
DLL	Requires Advapi32.dll.
Unicode	Implemented as QueryServiceConfigW (Unicode) and QueryServiceConfigA (ANSI).