Convert this please [resolved]

[cyborg]

Hi!

Could anyone please help me convert this VB code to C++ code?

Private Type PointUDT
    X As Double
    Y As Double
    Z As Double
End Type

I'm making a dll in C++ to speed up my VB program a bit, but i dont really know how to recieve UDT's from C++.....

[leinad31]

Syntax
struct [<struct type name>] {

[<type> <variable-name[, variable-name, ...]>] ;
.
.
.

} [<structure variables>] ;



Example

#include <string.h>

struct my_struct {
char name[80], phone_number[80];
int age, height;
} my_friend;

void func() {
strcpy(my_friend.name,"Mr. Wizard"); /* accessing an element */
}

struct my_struct my_friends[100]; /* declaring additional variables */

[cyborg]

I'm still having problems...Here's my struct:

struct sPoint {
	double X, Y, Z;
};

Here's the function in C++:

bool _stdcall CheckTriangle(sPoint A,sPoint B,sPoint C,double X,double Y)
{
    if (Determinant(A.X, A.Y, B.X, B.Y, X, Y) && Determinant(B.X, B.Y, C.X, C.Y, X, Y) && Determinant(C.X, C.Y, A.X, A.Y, X, Y))
        return true;
	else
        return false;
}

I don't have any problems compiling this code! It works fine.
It's in VB the problem is.

Here's the UDT in VB:

Private Type PointUDT
    X As Double
    Y As Double
    Z As Double
End Type

Here's how i declare the function:

Private Declare Function CheckTriangle Lib "3d.dll" (ByRef A As PointUDT, ByRef B As PointUDT, ByRef C As PointUDT, ByVal X As Double, ByVal Y As Double) As Boolean

VB gives me this error msg: "Bad DLL calling convention"
What's wrong with this code?

[azteched]

Your C function should take pointers to sPoint structs:

bool _stdcall CheckTriangle(sPoint* A,sPoint* B,sPoint* C,double X,double Y)

Also, when doing C dlls for VB i always use a def file to export the functions, are you doing that?

[dis1411]

just a thought, try this post and see if it helps

http://www.vbforums.com/showthread.php?threadid=260063

[cyborg]

Originally posted by azteched
Your C function should take pointers to sPoint structs:

Thanks alot! Works perfect now!