public static extern GPA_Status GPA_GetUsageTypeAsStr(GPA_Usage_Type counterUsageType, out String name);
public static extern GPA_Status GPA_GetUsageTypeAsStr(GPA_Usage_Type counterUsageType, out string usageTypeStr);
public static extern GPA_Status GPA_GetCounterUsageType(uint index, out GPA_Usage_Type counterUsageType );
public static extern GPA_Status GPA_GetCounterUsageType(gpa_uint32 index, out GPA_Usage_Type counterUsageType);