allocate memory and call the dll function that writes to the pointer

Hello!

I have a DLL that has a function as in the following example, I need to call from labview. In C, I need to allocate memory for data and of course the struct. I add the pointer and the length of the data to the struct and call the function with the struct. The function itself inserts values of the struct and affected memory. Someone at - it a working solution how this can be done with Labview?

typedef struct Thestruct
{
UINT16 val1;
UINT8 val2;
UINT8 val3;
DataLength UINT16;
UINT8 * data;
} T_Thestruct;

MY_API status MY_API_CALL udaReceive (handle, T_Thestruct * args);

I tried in labview (see photo), but I only got values inside the structure as well as the 1097 error, reserved memory included values as before.

OK, I found the soluton to my own problem. Alignment on the struct must be corrected in Labview. There must be a value between dataLength 2Bytes dummy and the pointer.

Tags: NI Software

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