VC++啟用CLR支援

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然後

//#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
//#using <System.Drawing.Common.dll>

using namespace std;
using namespace System;
using namespace System::Collections;
//using namespace System::Windows::Forms;
//using namespace System::ComponentModel;
//using namespace System::Data;
using namespace System::Drawing;
using namespace System::Drawing::Imaging;