Why do I get 'Bad call Dll Convention'?

Hello

the gall attached contains an experimental to read dll in LV 8.6 and use in VB6.

The zip file contains the vi (adding 2 numbers), LV, VB6 project.

The service seems to work.  He adds the numbers, but still, it gives the error "Bad dll calling convention".

I think I did good. I used the Conventioin of the Standard call.  I used Double in LV and long in VB.

How can I get rid of this error?

Sombody allows this example on his machine.  Maybe it's something to do with my specific machine?

VB usually gives the error "Bad DLL calling Convention" when you said an incorrect function.  This can be as simple as exporting with __cdecl instead of __stdcall (although this will crash more likely only), or it could be that because of the function declaration to say the battery is placed in a terrible state because the DLL call placed more or less data on the stack that VB should based on your statement.

In your specific case, I see a few problems.   For reference:

In LabVIEW, is your equivalent C function prototype as shown in your project file:

Double AddNumbers (double * xY, double x, double y)

In VB, your statement is:

Declare Sub AddNumbers Lib "D:\NI Projects\eDAS400\DLL\LVDLL Experiment\SharedLib.dll" _

(ByVal x As Double, ByVal y As Double, xy As Double)

The first "double" in the C prototype means that the function in the DLL call will return a double.  In your VB prototype, by declaring "Sub" you are, in essence, says VB you don't expect the DLL to return data.  It is a likely cause of your error.  To resolve this issue, change to say "Declare function", and then add 'Double' at the end of the statement.

The second problem I see is that in your prototype C, the first parameter is passed by reference (like a pointer).  However, your statement of VB, passes all ByVal.  You must change this option to make the parameter that returns data (in this case xY) is passed ByRef.

Finally, it seems that your parameters in the function of C are probably not in the order that you expect.  I expect to be x, y, xy (which you have in the VB declaration), but the order in the C (ie. in the DLL) function is not the same.  This results in a funny behavior.  The order must match between the two.  To resolve this, I recommend you actually change the LV DLL so that settings are exported in more logical x, y, xy order.

I think this should take care of your problems.  Sorry so lengthy, but I wanted to make sure that you understand the 'why' on this one because it can be a common error trying to create/call VB dll.

Jason

Tags: NI Software

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