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How to do CreateFileMapping in a C++ DLL and access it in C#, VB and C++

, 10 Mar 2009 CPOL
This is yet another example for memory mapped files. What is cool though is unlike other samples, I have a SetData(TCHAR* Key, TCHAR* value) / GetData(TCHAR* key) pattern here.
MMF_SetData_GetData.zip
tubelite
bin
Client_CSharp.exe
Client_CSharp.vshost.exe
Client_CSharp.vshost.exe.manifest
Client_VBNET.exe
Client_Win32Console.exe
Client_Win32Console.ilk
SHAREDMEM.dll
SHAREDMEM.exp
SHAREDMEM.ilk
SHAREDMEM.lib
CSharpConsumer
bin
Debug
WindowsFormsApplication1.exe
Properties
Settings.settings
SHAREDMEM
module.def
Release
mt.dep
sharedmem.dll.intermediate.manifest
sharedmem.pch
vc90.idb
sharedmem.vcproj.Pranav-PC.Pranav.user
UnmanagedConsumer
Release
mt.dep
Test1.exe.intermediate.manifest
vc90.idb
Test1.vcproj.Pranav-PC.Pranav.user
VBNETConsumer
bin
My Project
Application.myapp
Settings.settings
Imports System.Runtime.InteropServices

Public Class Form1
    Public Declare Unicode Sub SetValue Lib "sharedmem.dll" (ByVal key As String, _
                                                          ByVal value As String)

    Declare Unicode Function GetValue Lib "sharedmem.dll" (ByVal key As String) As IntPtr

    Declare Auto Function GetRecordCount Lib "sharedmem.dll" () As Integer


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        SetValue(TextBox1.Text, TextBox2.Text)
        LinkLabel1_LinkClicked(Nothing, Nothing)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        TextBox2.Text = Marshal.PtrToStringUni(GetValue(TextBox1.Text))
    End Sub

    Private Sub LinkLabel1_LinkClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
        LinkLabel1.Text = "Record Count = " + GetRecordCount().ToString()
    End Sub
End Class

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nkrscorpio
Software Developer
United States United States
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