C++ DLL loading by C#

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I have a first method of a C++ dll
1.HRESULT WINAPI StartInit(Void)
2.HREULT WINAPI LoadInitBitmap(LPWSTR IpBMPFilename, UINT uid);
How can I load the dll and define those methods.

What I have tried:

[DllImport("tjp.dll", EntryPoint = "LoadLibrary")]
       static extern IntPtr StartInit();
       public Form1()
       {
           InitializeComponent();

       }

       private void btnLoadDll_Click(object sender, EventArgs e)
       {
           var res = StartInit();

       }

Posted 9-Mar-21 18:47pm

Amir Hamza Kayes

Updated 9-Mar-21 22:10pm

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Richard MacCutchan · Answer 1 · 2021-03-09T22:10:00

The DllImport declaration must define the actual entry point that you wish to call

C#

[DllImport("tjp.dll", EntryPoint = "StartInit")] // 
static extern IntPtr StartInit();

public Form1()
{
    InitializeComponent();

}

private void btnLoadDll_Click(object sender, EventArgs e)
{
    var res = StartInit();

}