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cannot get the element of array by LabVIEW Array Handle in DLL

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the vc code follows: 

 

#include "extcode.h"

/* LabVIEW created typedef */
typedef struct {
 int32 dimSize;
 double elt[1];
} TD1;
typedef TD1 **TD1Hdl;

extern "C"
{
 _declspec(dllexport) void CINRun(TD1Hdl input,double *output);
};

 _declspec(dllexport) void CINRun(TD1Hdl input,double *output)
{
 //cannot get the first element of the array passed from labview to DLL
 *output=(*input)->elt[0];


 //if change the code above with follows
 //*output=(*input)->dimSize;
 //then it is successful to get the size of one dimension array.
 //So,what's the matter?
}

 

the vc project and labview program are attached.

 

the problem is:run the labview program, cannot get the right result from the array 

 

thanks

chen

帖子被chenyin在 02-16-2010 12:28 AM
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Solution
Accepted by topic author chenyin

You have made two errors:

 

Error 1 (alignment!):

 

Err1.png

 

Error 2: passing parameters:

 

Err2.png

 

Change it as shown above and it should be OK. 

 

Andrey.

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thank Andrey Dmitriev

you help me out of a big problem.

So, how do you know the errors?

Now I just have only one manul about DLL attached and I haven't found anything about you said above in this manul.

 

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chenyin wrote:

thank Andrey Dmitriev

you help me out of a big problem.

So, how do you know the errors?

Now I just have only one manual about DLL attached and I haven't found anything about you said above in this manual.

 

 


 

The answer is: "Experience + RTFM"

 

Please read the following topic: Re: Array of doubles filled by DLL contains weird values

 

Andrey.

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thank you Andrey Dmitriev

thanks!It's very useful!

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