Labview equivalent of C pointer

Question

Dear All,
In the Labview program, that I'm currently writting, I'm using a dll that was written in C. The C function I'm trying to call, is expecting a pointer to char in its prototype like so: void example(unsigned char *a); What is the Labview equivalent of a char *.
Thanks in advance for your help,
Regards,
Alan

Answer 1

There is a difference in passing a char type and a char array (string).  First of all, C expects the string to end with the NULL character (\0).  You need to append the NULL to the string, then convert the string to a byte array (String to Byte Array function).  Then in order to pass the array to the C DLL, you need to declare the parameter as Type=Array, Data Type=U8, Dimensions=1, Array Format=Array Data Pointer.  This will pass the string into the DLL.
- tbob
Inventor of the WORM Global
Attachments:
GetFirstFile.png ‏2 KB