can we have data types for C structs and union in VB

[vipingverma]

Hi

I am having this structure in VC, can I have the same data type in VB, and how it will look like

Thanks

struct trevariant_struct {
short NullInd;
Long TreType;
union trevariant_datatype {
long VLong;
double VDouble;
char *VString;
TRE_BLOBVALUE VBlob;
struct trearray_struct {
long Size; /* Size of array */
TRE_VARIANT *Elements; /* Array of elements */
} VArray;
struct trehash_struct { /* All TRE_HASH types */
long Size; /* Number of values in hash */
TRE_HASHVALUE *Elements; /* Array of key value pairs in hash */
} VHash;
} Data;
};

[graySteel]

Hi

You can use a Type declaration as a part of struct. Like...

Type <TypeName>

Members Declaration
Members Declaration
Members Declaration
-------
End Type

There's no concept of Unions in VB.


Gs

[DiGiTalErRoR]

Private Type tVals
  Val as Long
  Loc as POINTAPI
End Type
 
Private Type tSys
  strName$  
  Vals() as tVals 'dynamic UDT array
End Type

[vipingverma]

Thanks for the response, so that means we cant map this data structure in VB ?

struct trevariant_struct {
 short NullInd;
 Long TreType;
 union trevariant_datatype {
                                       long VLong; 
                                       double VDouble; 
                                       char *VString; 
                                       TRE_BLOBVALUE VBlob; 
                                        } Data;
};

[Dave Sell]

I used the VB Type but I wasn't able to pass it around the whole project for some reason. Instead I just made a class.

This is 2004 - forget structs - use a class

[RhinoBull]

Originally posted by Dave Sell
I used the VB Type but I wasn't able to pass it around the whole project for some reason ...

If you did not declare it as Public at the MODULE level then you obviously won't be able to ...

[Dave Sell]

Yes it was Public - it just wouldnt pass around to all parts of the code when Passing as an argument ByVal.

[vipingverma]

Hi

I am not getting the meaning of replies, I have a dll for which source code is not available to me and it expects a struct as parameter which internally has union inside ( Data structure I have already posted), now is in VB is there any way to create a data structure like this C structure