How can I modify the "Type definition​s" of "Function Prototype" if I want build a DLL in Labview 8.5.1.?

Question

Hello,
We have a library with several VIs (API - Interfaces to our Real Time Target). This VIs we provide to our customer to generate own VIs to control the Real Time Target.
Now we want to provide the functionality of this VI-library as DLL to our customer. The problem is, that labview use self definite name of type definitions. Also if I use "strict Type definition".
Example:
void GetOutputValues(VARIANT *Scale_In, int32_t ModelNr, uint16_t SignalID[], TD1 *errorIn, VARIANT *Scale_Out, TD2 *Data, TD1 *errorOut, int32_t len)
It is possible to modify "TD1" and "TD2"? I want to give useful names.
Greetings
Steffen

Answer 1

Hi Steffen,
      Try editing the .h file as follows:
CHANGE FROM:
typedef struct {
 LVBoolean status;
 long code;
 LStrHandle source;
 } TD1;
CHANGE TO:
typedef struct {
 LVBoolean status;
 long code;
 LStrHandle source;
 } TD1;
typedef struct {
 LVBoolean status;
 long code;
 LStrHandle source;
 } LVErrorCluster;
then your GetOutputValues prototype becomes:
void GetOutputValues(VARIANT *Scale_In, int32_t ModelNr, uint16_t SignalID[], LVErrorCluster *errorIn, VARIANT *Scale_Out, TD2 *Data, LVErrorCluster *errorOut, int32_t len)
If your source-code doesn't refer to "TD1", then you probably won't need to keep the TD1 prototype!
Cheers.
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)