System.OverflowException: Arithmetic operation resulted in an overflow?

Question

C++ / C#

string desktop = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);

            String dName = "".PadRight(100);
            String dVersion = "".PadRight(100);
            IntPtr hWndC = capCreateCaptureWindowA("VFW Capture", WS_POPUP | WS_CHILD, 0, 0, 320, 240, 0, 0); // узнать дескриптор камеры
            SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0); //подключиться к камере
            string path = [email protected]"\ВАЖН0\text\" + "1" + ".jpg";
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32()); // сохранить скриншот
            SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); //отключить камеру

Unhandled exception. System.OverflowException: Arithmetic operation resulted in an overflow.
   at System.IntPtr.ToInt32()
   at cheatchecker.Program.Photo() in D:\code\c#-saves\cheatchecker\Program.cs:line 132
   at cheatchecker.Program.Main(String[] args) in D:\code\c#-saves\cheatchecker\Program.cs:line 44

Line 44 - function call.
How to fix it?) Or how to normally take a screenshot and save it as a file? Everything on google doesn't work.

Answer 1

And what is the connection between the camera and the screenshot?
the first search result: https://habr.com/ru/post/316012/

Answer 2

hBmp.ToInt32()and in the x64 application, how will he convert the pointer to x32?