DLL import failure in using WinDivert - c++-cli

Question

I am going to design a program using WinDivert to manipulate the network traffic.
The language I use is C++ and the program is designed under Visual Studio 2008.
Firstly I create a project in visual C++ CLR (Windows Forms Application) so I can implement the UI simply.
For importing the WinDirvert Library, I have done the following setting in project properties:
Configuaration Properties: General
Common Language Runtime support: Common Language Runtime Support(/ctr)
Configuaration Properties: Linker
Additional Dependencies: link of WinDivert.lib
Module Definition File: link of windivert.def
Within the project I have created, I also added the windivert.h in the header files.
Also, windivert.h is included in the main entry point of my project (ProjectG.cpp):
#include "stdafx.h"
#include "Form1.h"
#pragma managed(push, off)
#include "windivert.h"
#pragma managed(pop)
using namespace ProjectG;
[STAThreadAttribute]
int main(array<System::String ^> ^args)
{
// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
// Create the main window and run it
Application::Run(gcnew Form1());
HANDLE handle;
unsigned char packet[8192];
UINT packet_len;
WINDIVERT_ADDRESS addr;
handle = WinDivertOpen("udp", WINDIVERT_LAYER_NETWORK, 0,
WINDIVERT_FLAG_DROP);
if (handle == INVALID_HANDLE_VALUE)
{
Application::Exit();
}
while (TRUE)
{
// Read a matching packet.
if (!WinDivertRecv(handle, packet, sizeof(packet), &addr, &packet_len))
{
MessageBox::Show("Fail");
continue;
}
}
return 0;
}
Finally, I put the {WinDivert.dll, windivert.h, WinDivert.lib, WinDivert32.sys} under the project directory.
However, the following error is shown:
fatal error LNK1306: DLL entry point "int __clrcall main(cli::array<class
System::String ^ >^)" (?main##$$HYMHP$01AP$AAVString#System###Z) cannot be managed;
compile to native ProjectG.obj ProjectG
Additional: (a warning)
warning LNK4070: /OUT:WinDivert.dll directive in .EXP differs from output filename
'C:\Users\David\Desktop\css\ProjectG\Debug\ProjectG.exe'; ignoring directive
ProjectG.exp ProjectG
Question:
How can I resolve this situation?

Answer 1

a) your main source is .cpp, so you can delete [STAThreadAttribute] and change
int main(array<System::String ^> ^args) to int _tmain(int argc, _TCHAR* argv[])
b) exclude windivert.def from linker Module Definition File, this only when you are creating a DLL
c) the DLL/SYS files would need to be copied to the Debug and Release folders