Windows Service调用显卡API有关问题

Windows Service调用显卡API问题
整个问题简化为：Windows Service调用Nvidia显卡的api时，

C/C++ code

NvAPI_Status status;NvDisplayHandle hDisplay_a[NVAPI_MAX_PHYSICAL_GPUS * 2] = {0};NvPhysicalGpuHandle nvGPUHandle;status = NvAPI_Initialize();NvPhysicalGpuHandle physicalGPUs[NVAPI_MAX_PHYSICAL_GPUS];  NvU32 physicalGPUCount;  status = NvAPI_EnumPhysicalGPUs(physicalGPUs, &physicalGPUCount); 

最后返回的status为NVAPI_NVIDIA_DEVICE_NOT_FOUND，
No NVIDIA display driver, or NVIDIA GPU driving a display, was found.

而在单独application或者dll中调这段代码都能正确返回，
只有windows service里调这段代码返回错误，求解？




[解决办法]
WTSGetActiveConsoleSessionId
SetTokenInformation
CreateProcessAsUser

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