CODEWITHSUNDEEP
c++vb.netdll
user2902891
user2902891

Reputation:

Returning strings from C++ dll to vb

I have the following dll cpp file 

#include "stdafx.h"
#include <string.h>
#include <Windows.h>
#include <OleAuto.h>
using namespace std;
extern "C" __declspec(dllexport) BSTR func(BSTR a) 
{
BSTR buffer;
buffer = SysAllocString(a);
 return buffer;
}

At the vb end 

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Dim string1 As String
    string1 = func(TextBox1.Text)
    TextBox2.Text = string1
End Sub

The above code compiles properly but the form closes before displaying the string in the textbox. But if I return the text as an integer, it works fine...

Upvotes: 0

Views: 938

Answers (1)

Al.Pertro
Al.Pertro

Reputation: 175

BSTR != VB.NET String i think ,,, use LPCSTR

extern "C" __declspec(dllexport) LPCSTR func(LPCSTR a)

Upvotes: 1

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