GorionQuest

QUOTE (rolfk @ Mar 24 2008, 09:57 PM) Many thanks for the correction. Please let me know if you happen to be in Penang, Malaysia. I would be happy to give you a tour.

Hi guys, Basically here is my code after the advice. Please let me know if you think I have done it wrong. Much appreciate the advice. I have not tested it on the hardware as I need it to be hooked up properly to test it. I used the MoveBlock() code from LabVIEW to get the data from the pointer passed by the uint32 into the first parameter of the MoveBlock() and wired a cluster constant with 2 SGL and one I16 to reflect the struct which is float, float and short. The size of the struct should be 12 bytes. Thanks for any feedback. Philip

QUOTE (rolfk @ Mar 21 2008, 06:57 PM) Hi rolfk, Thanks for the answer, I was tempted to write a wrapper for the DLL since it was recommended in most NI forums but I do not have the source code for the dll in C/C++. But I will try the MoveBlock() if it could solve this problem. Thanks for the guidance! I have been using LabVIEW too extensively, guess I need to learn C programming to make full use of the external code call to maximise LabVIEW. Again thanks for the information. Philip

Hi all, I searched high and low in NI's website for solutions for calling a DLL which returns a struct (the DLL is for third party SMU cards). I wonder if it is alright to ask here for some guidelines. I have never used C before and has relied on NI LabVIEW and NI's cards for most of the work done. Appreciate the help. Here is the a snippet of the header file for the DLL. As shown below the struct contains a float,float and short typedef struct SMUmeasurement { float Voltage; float Current; short MeasurementStatus; } SMUmeasurement; and here is the function that returns the struct value: SMUmeasurement WINAPI MeasureAvrgVandI_SMU_DM200(short DeviceID, short SampleCount); When I used the LabVIEW 8.5 dll import wizard, I found out that it only returns a unsigned integer instead of a nice cluster. Please see attached image. Thanks for the guidance, Regards, Philip