C++ DLL Export to C#, example with messagebox

You have to use “extern “C” __declspec(dllexport)” before void to make it for export.
C++ code:

int WINAPI MessageBox(
_In_opt_ HWND hWnd,
_In_opt_ LPCTSTR lpText,
_In_opt_ LPCTSTR lpCaption,
_In_ UINT uType
);

extern “C” __declspec(dllexport) void MsgBox()
{
MessageBox(NULL,TEXT(“LOL”), TEXT(“LEL”),0x00000000L);
}

С# Code:

[DllImport(“MessageBoxShow.dll”, CharSet = CharSet.Unicode)]
public static extern void MessageBoxShow();
private void button1_Click(object sender, EventArgs e)
{
MessageBoxShow();
}

Nguồn:https://wijstaanvooronzegrondrechten.org/