Passing parentHWND to UnityMain function

Hi guys,

I'm trying to do the following in windows standalone build (2017.3) :

1) Launch unity from my process as explained in here
https://docs.unity3d.com/Manual/WindowsStandaloneBinaries.html

2) pass the UnityMain function -parentHWND with my handle

I don't get it to work, it simply ignores the -parentHWND parameter

Any ideas ?

Thanks, Benny

 

Ok, figured it out in case anyone else has the same problem

1) get a pointer to the command line string by using GetCommandLine()
2) modify the string (same pointer address) to use the "-parentHWND <your handle>"
3) call UnityMain(0,0,L"", 10) // 10 is for normal window state

And a snippet

Code (csharp):

1.  
2. #include "stdafx.h"
3. #include <string>
4.  
5. //Make sure you call this process with command line arguments "-parentHWND 0000000000"
6.  
7. typedef int (*unityFN)(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd);
8. void LaunchUnity(HWND hwnd)
9. {
10.     const int hwndParamsSize = 10;
11.     const int showCmd = 10;
12.     auto dllHandle = LoadLibrary(L"UnityPlayer.dll");
13.     auto funcHandle = GetProcAddress(dllHandle, "UnityMain");
14.     unityFN unityFunc = (unityFN)funcHandle;
15.  
16.     auto cmd = GetCommandLine();
17.     auto hwndStr = std::to_wstring((int)hwnd);
18.     auto cmdStr = std::wstring(cmd);
19.     int i = cmdStr.size() - hwndParamsSize;
20.     for (int j = 0; i < cmdStr.size() - hwndParamsSize + hwndStr.size(); i++, j++)
21.     {
22.         cmd[i] = hwndStr[j];
23.     }
24.     cmd[i] = 0;
25.  
26.     unityFunc(0, 0, L"", showCmd);
27. }
28.  

Hope it'll help someone, Benny