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I wrote a short program(In c#) that uses the tg_api.dll to control the signal generator. I used the simple example provided by the SDK as a reference, but when invoking
tgOpenDevice(device)
I get a ‘-3’ error, which corresponds to tgDeviceInvalidErr
I am using ‘0’ as the device value. Is this correct? All the drivers are installed and i can run the signal generator from the Spike GUI.
Is there any more information about what can cause the error?
Hello Nazar,
I’m looking at this function right now and there is only one location where this error value (-3) can be returned. The code for this is below.
if(device < 0 || device >= TG_MAX_DEVICES) {
return tgDeviceInvalidErr;
}where TG_MAX_DEVICES = 4.
So if the device integer provided is less than 0 or greater then 3 then this error (-3) is returned. I would look into the interop between your C# application and this function. This integer argument is not being passed properly. You are using DllImport and setting the calling convention to Cdecl?
Regards,
AndrewHello Andrew
With your information, i was able to fix the problem. I used the bb_api as a guide, so assumed the device id had to be a reference, which was the problem.
Bad:
[DllImport(“tg_api.dll”, CallingConvention = CallingConvention.Cdecl)]
public static extern tgStatus tgOpenDevice(ref int device);Good:
[DllImport(“tg_api.dll”, CallingConvention = CallingConvention.Cdecl)]
public static extern tgStatus tgOpenDevice(int device);Thank you very much
Nazar
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