public class A
{	
	//调用Win32 API
	[System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "MoveWindow")]
	public static extern bool MoveWindow(System.IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);
 
	//打开窗体方法，fileName是C++的窗体名称，包含路径	
	private void OpenAndSetWindow(String fileName)
	{
		Process p = new Process();//新建进程
		p.StartInfo.FileName = fileName;//设置进程名字
		p.StartInfo.CreateNoWindow = true;
		p.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
		p.Start();
		MoveWindow(p.MainWindowHandle, 200, 300, 500, 400, true);
		//p.MainWindowHandle是你要移动的窗口的句柄；200,300是移动后窗口左上角的横纵坐标；500,400是移动后窗口的宽度和高度；true表示移动后的窗口是需要重画	
    }
}