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passing a string from C++ DLL to VB

 
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passing a string from C++ DLL to VB
thiviravadhi
16 May, 2007 - 06:24 AM
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CODE

/* Code in VB */

Private Sub sendmsg_Click()
    MsgBox sendDiameterMessage("test.xml")
   //Here I am not getting the value “exists” as passed from C++
End Sub

/* Declaration of the C++ function in VB */

Public Declare Function sendDiameterMessage Lib "VCDLL.dll" (ByVal filename As String) As String

/*Function in C++ */

extern "C" char* __stdcall sendDiameterMessage(char* filename) {
    cout << filename;
        //Here I am getting the value “test.xml” as passed from VB
    char* msg = "exists";
    return msg;
}



i am able to pass a string from VB to a C++ DLL... when i try to do the reverse process, i am going wrong somewhere!

i tried using BSTR, LPSTR instead of char*, not much use!
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Trogdor
RE: Passing A String From C++ DLL To VB
16 May, 2007 - 09:23 AM
Post #2

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It should be a BSTR as far as i remember.
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