Calling a DLL with a & (ampersand) in the declaration

Hi,
I'm trying to call an external DLL and having issues calling an important function. The 'FindDevices' call has the following declaration:
long FindDevices(long &DeviceCount);
I've never come across calling an external function with an ampersand (indicating that a reference, rather than a pointer, shall be passed) before. Is this possible with LabView?
I've tried many permutations of the DLL configuration, but it usually crashes the entire development environment. Here is a link to the DLL and *.h file if you'd like to give it a shot. It's a 64-bit DLL, and I've been developing this on 64-bit Labview and Windows 7 x64. It also requires the configuration file 'ZStepperSettings.xml' to be in the same directory as the DLL.
Thanks for your time.
Attachments:
ZStepper_SDK.h ‏6 KB

For scalars the C++ reference syntax should be equal to a standard C pointer. For other datatypes that is certainly not guaranteed. Since long is a scalar I would guess the problem to be elsewhere. Are you sure the calling convention is correct?
Also the effect that it only causes the 1097 error sometimes, as well as crashing only sometimes is not so strange. There is no supervisor that can 100% surely detect if there is some memory violation during a call to an external function. Eventhough the parameter configuration is wrong or the DLL does something bad, this doesn't always result in a behaviour that LabVIEW could detect or would always cause a crash. It depends on the actual memory layout of your process at the moment this function is called if the error will be causing one of these problems. But be assured that if there is an error in how the function is configured or a bug in the function about how it access the memory especially for writing operation, something bad is done to the memory that will sooner or later cause very serious problems to your application.
EDIT: It seems that while C++references for scalar types are usually implemented as pointers by the compiler, there is nothing in the C++ standard that mandates this nor defines in any way how they should be implemented. So basically C++ references are not a safe datatype to use if you want to allow a function to be callable by anything else than code compiled with the same C++ compiler. Basically anything C++ specific is not safe at all in that sense. And anything standard C conformant mostly only by convention and not by specific requirements set forth in the C standard.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Message Edited by darkxceed on 02-12-2010 04:33 AM
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> Thanks for the information Greg. There is no documentation on this
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>
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Nils Gokemeijer wrote:
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Anyway I've resolved the problem by adding the "lvanlys.dll" file (present in "..\Labview 7.1\resource\lvanlys.dll" path) as support file in the building process. Now the DLL containing the analysis functions works correctly.
Natalino Roberto
Ok, you probably got lucky since the lvanlys.dll seems to implement that function directly. However most Advanced Analysis functions are just redirected by lvanlys.dll to the Intel Math Kerneal Library that gets installed with LabVIEW 7.1 and higher. The only way to get that properly installed with your LabVIEW executable or DLL is to create a LabVIEW installer in your Application Builder and make sure to select under "Installer Settings->Advanced" the "LabVIEW Run-Time Engine" and the "Analyze VIs Support". Then use that installer to install your DLL on another computer.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

Stack overflow when calling a DLL

I have developped a DLL in Ada.
I tried to call a function of this DLL from a C++ executable.
My program crashed because of a stack overflow.
Then, I increased the stack size of my program (linker option), and now it
works.
Calling this DLL through the call library function from a 6.0 Labview
program causes the same stack overflow.
How could I increase the stack size of my Labview program ?
Thanks.

Hi,
I have never come across this issue but here are a few things you can try:
1) Change the Calling Convention between C and StdCall(WINAPI). The main difference between the two calling conventions has to do with when the stack is cleaned up. In one method, the stack is cleaned earlier than in the other method.
2) Call your dll with LabVIEW 7.0. You can find the evaluation version of the latest version at http://www.ni.com/labview
Good luck
Feroz

JNI calls using dll build in DEBUG mode

I have deployed a filter which loads a dll in the init method. The dll is build in DEBUG mode. The doFilter() method is never called. But If I build the same dll with out DEBUG parameter the doFilter() method is called. what is the issue? I need to debug the dll by attaching it to Visual Studio.
--JArchie

> i had a requirement to invoke a RFC Async and recieve
> the results in my program ...
That is not possible. When you call an RFC async, you cannot receive the result of the RFC. If you want the results, you have to call the RFC syncronously.
When you debug, the debugger calls the RFC synchronously, to enable you the debugging of the RFC.
Regards
Stefan

Calling a DLL with a & (ampersand) in the declaration

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