I have been trying for the last few days to get the temperature of my GPU using C++
using the NVAPI i have the following code
#include "stdafx.h"
#include "nvapi.h"
int _tmain(int argc, _TCHAR* argv[])
{
NvAPI_Status ret = NVAPI_OK;
int i=0;
NvDisplayHandle hDisplay_a[NVAPI_MAX_PHYSICAL_GPUS*2] = {0};
ret = NvAPI_Initialize();
if (!ret == NVAPI_OK){
NvAPI_ShortString string;
NvAPI_GetErrorMessage(ret, string);
printf("NVAPI NvAPI_Initialize: %s\n", string);
}
NvAPI_ShortString ver;
NvAPI_GetInterfaceVersionString(ver);
printf("NVAPI Version: %s\n", ver);
NvU32 cnt;
NvPhysicalGpuHandle phys;
ret = NvAPI_EnumPhysicalGPUs(&phys, &cnt);
if (!ret == NVAPI_OK){
NvAPI_ShortString string;
NvAPI_GetErrorMessage(ret, string);
printf("NVAPI NvAPI_EnumPhysicalGPUs: %s\n", string);
}
NvAPI_ShortString name;
NV_GPU_THERMAL_SETTINGS thermal;
ret = NvAPI_GPU_GetFullName(phys, name);
if (!ret == NVAPI_OK){
NvAPI_ShortString string;
NvAPI_GetErrorMessage(ret, string);
printf("NVAPI NvAPI_GPU_GetFullName: %s\n", string);
}
printf("Name: %s\n", name);
thermal.version =NV_GPU_THERMAL_SETTINGS_VER;
ret = NvAPI_GPU_GetThermalSettings(phys,0, &thermal);
if (!ret == NVAPI_OK){
NvAPI_ShortString string;
NvAPI_GetErrorMessage(ret, string);
printf("NVAPI NvAPI_GPU_GetThermalSettings: %s\n", string);
}
printf("Temp: %l C\n", thermal.sensor[0].currentTemp);
return 0;
}
The output i get is
NVAPI Version: NVidia Complete Version 1.10
Name: GeForce GTX 680
Temp: C
So NVAPI is initializing, and it can find my GPU which is a GTX680, but it wont return a temperature
I think that the problem is that you are required to set thermal settings in the following way:
Also you should also write:
because you could corrupt memory. (Note look at NvAPI_EnumPhysicalGPUs in the documentation supplied with NVAPI).
You are already able to get correct value for thermal.sensor[0].currentTemp,
just you are mistaking while printing.
Please Look at thermal.sensor structure in Nvapi:
It shows that NvS32 currentTemp is Signed 32 bit integer.
printf
is very sensitive to the size and type of parameters it is passed.Since
currentTemp
is fixed as a 32 bit unsigned (and C++ does not guarantee specific bitcounts for the typesprintf
likes), cast it to a type thatprintf
can anticipate.Your code almost works, just typos on these lines ;)
change them to :