Re: [問題] 繪圖與部分繪圖

[wwllccrr (松鼠)]

抱歉! 真的是試了很久還是寫不出來! 希望您能再給點提示!

目前我的程式碼：


Bitmap offScreenBmp;
Graphics Screen;

private void Form_load_call()
        {
             offScreenBmp = new Bitmap(this.Width, this.Height);
             Graphics Buffer= Graphics.FromImage(offScreenBmp);

             Bitmap pic = new Bitmap("pic.jpg");

             Buffer.Clear(this.BackColor);
             Buffer.DrawImage(pic, pic_x, 0, pic.Width, pic.Height);
        }

private void MyPaint()
        {
             Screen.DrawImage(offScreenBmp, 0, 0);
        }

private void Timer_move(object sender, EventArgs e)
        {
            pic_x += 3; //先不設定KeyDown　直接讓他移動就好

            MyPaint();
        }


執行以後MyPaint()那行會出現：

      NullReferenceException未處理

      並未將物件參考設定為物件的執行個體


請問要怎麼解決呢?

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