APP C# WinAPI 적용

using System.Runtime.interopServices 네임페이스 추가

[DllImport ("라이브러리")]

int GetWindowsText(HWND hWnd, LPTSTR IpString , int nMaxCount);

을 C #을로 변형 -> public static extern int GetWindowsText(int hWnd, StringBuilder Ipstring , int nMaxCount);