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分享动态加载驱动函数ActivateDeviceEx() 什么情况下返回0？
从网上一些资料看，ActivateDeviceEx()如果执行失败，应该返回句柄INVALID_HANDLE_VALUE，但是我在用的时候发现，很多时候返回0也是驱动加载失败的情况，比如：注册表值设置错误。这时驱动加载是失败的，不可用。
但有时候返回0，是因为驱动重复加载，这时驱动是可用的。
请问，还有哪些情况此函数返回0？
返回0的具体意义是什么？
但有时候返回0，是因为驱动重复加载，这时驱动是可用的。
请问，还有哪些情况此函数返回0？
返回0的具体意义是什么？
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rickys2080 2012-10-28
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GetLastError
OK，我试试
OK，我试试
gooogleman 2012-10-27
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if successful. If the function is not successful, it returns INVALID_HANDLE_VALUE. To obtain extended error information, call GetLastError.
---------------------GetLastError
---------------------GetLastError
rickys2080 2012-10-26
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1楼的资料我之前看过，没说明返回0是怎么回事，0不是一个有效的HANDLE，但具体是什么意思呢？
rickys2080 2012-10-26
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谢谢楼上。
还有高人指点吗？
还有高人指点吗？
一介布衣萧萧 2012-10-26
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This function loads a driver and adds its registry values to the Active key in the registry.
HANDLE ActivateDeviceEx(
LPCWSTR lpszDevKey,
LPCVOID lpRegEnts,
DWORD cRegEnts,
LPVOID lpvParam
);
Parameters
lpszDevKey
[in] Pointer to a string containing the registry path of the device driver's registry key. This key contains the driver's DLL name, prefix, and other data. For information about the subkeys of the HKEY_LOCAL_MACHINE\Drivers\Active registry key, see Device Manager Registry Keys.
lpRegEnts
[in] Pointer to an array of REGINI structures, each of which defines a registry value to add to the device's Active registry key before its driver is loaded. Set to NULL unless it is for a bus driver.
cRegEnts
[in] Count of the number of REGINI structures to which lpRegEnts points. This affects a generalization of the ActivateDevice function.
lpvParam
[in] Opaque pointer to a driver-specific data structure. You can use it to pass parameters to the loaded driver without having to write them through the registry. lpvParam is passed to the XXX_Init (Device Manager) function as a second parameter. lpvParam can be used by bus drivers to pass bus-specific information, entry points, or both to loaded drivers. Using this parameter prevents clients of that bus from becoming bus-agnostic. This is acceptable for some busses, especially those whose drivers cannot become bus-agnostic.
Return Values
Returns a handle that you can use later as the parameter to the DeactivateDevice function, if successful. If the function is not successful, it returns INVALID_HANDLE_VALUE. To obtain extended error information, call GetLastError.
HANDLE ActivateDeviceEx(
LPCWSTR lpszDevKey,
LPCVOID lpRegEnts,
DWORD cRegEnts,
LPVOID lpvParam
);
Parameters
lpszDevKey
[in] Pointer to a string containing the registry path of the device driver's registry key. This key contains the driver's DLL name, prefix, and other data. For information about the subkeys of the HKEY_LOCAL_MACHINE\Drivers\Active registry key, see Device Manager Registry Keys.
lpRegEnts
[in] Pointer to an array of REGINI structures, each of which defines a registry value to add to the device's Active registry key before its driver is loaded. Set to NULL unless it is for a bus driver.
cRegEnts
[in] Count of the number of REGINI structures to which lpRegEnts points. This affects a generalization of the ActivateDevice function.
lpvParam
[in] Opaque pointer to a driver-specific data structure. You can use it to pass parameters to the loaded driver without having to write them through the registry. lpvParam is passed to the XXX_Init (Device Manager) function as a second parameter. lpvParam can be used by bus drivers to pass bus-specific information, entry points, or both to loaded drivers. Using this parameter prevents clients of that bus from becoming bus-agnostic. This is acceptable for some busses, especially those whose drivers cannot become bus-agnostic.
Return Values
Returns a handle that you can use later as the parameter to the DeactivateDevice function, if successful. If the function is not successful, it returns INVALID_HANDLE_VALUE. To obtain extended error information, call GetLastError.
