C#仿QQ實現簡單的截圖功能
接上一篇寫的截取電腦屏幕,我們在原來的基礎上加一個選擇區域的功能,實現自定義選擇截圖。
個人比較懶,上一篇的代碼就不重新設計瞭,就簡單改一下呈現方式。
不得不吐槽一下,在windows10系統上設置瞭放大比例的話,用這種方式來實現截圖功能的話需要去計算比例。後面有機會的話,用第三方DLL再實現一次。
實現功能
屏幕選擇區域截圖
開發環境
開發工具:Visual Studio 2013
.NET Framework版本:4.5
實現代碼
//將上一篇的內容改成以下內容 // pictureBox1.Image = bmp; Form2 frm = new Form2(); frm.BaseImage = bmp; frm.TopMost = true; frm.Show();
/*Form2代碼*/ #region Dll引用 [DllImport("User32.dll", EntryPoint = "GetDC")] private extern static IntPtr GetDC(IntPtr hWnd); [DllImport("User32.dll", EntryPoint = "ReleaseDC")] private extern static int ReleaseDC(IntPtr hWnd, IntPtr hDC); [DllImport("gdi32.dll")] public static extern int GetDeviceCaps(IntPtr hdc, int nIndex); [DllImport("User32.dll")] public static extern int GetSystemMetrics(int hWnd); const int DESKTOPVERTRES = 117; const int DESKTOPHORZRES = 118; const int SM_CXSCREEN = 0; const int SM_CYSCREEN = 1; #endregion //<summary> //獲取DPI縮放比例 //</summary> //<param name="dpiscalex"></param> //<param name="dpiscaley"></param> public static void GetDPIScale(ref float dpiscalex, ref float dpiscaley) { int x = GetSystemMetrics(SM_CXSCREEN); int y = GetSystemMetrics(SM_CYSCREEN); IntPtr hdc = GetDC(IntPtr.Zero); int w = GetDeviceCaps(hdc, DESKTOPHORZRES); int h = GetDeviceCaps(hdc, DESKTOPVERTRES); ReleaseDC(IntPtr.Zero, hdc); dpiscalex = (float)w / x; dpiscaley = (float)h / y; } public Bitmap BaseImage { get; set; } Graphics picGraphics; //記錄鼠標開始截圖的位置 int startX = 0, startY = 0; //記錄鼠標結束截圖的位置 int endX = 0, endY = 0; //記錄DPI縮放比例 float x = 0f, y = 0f; public Form2() { InitializeComponent(); } private void Form2_Load(object sender, EventArgs e) { /* 初始化賦值*/ GetDPIScale(ref x, ref y); picGraphics = pictureBox1.CreateGraphics(); } private void pictureBox1_Paint(object sender, PaintEventArgs e) { DrawRect(endX - startX, endY - startY,e.Graphics); } private void Form2_KeyPress(object sender, KeyPressEventArgs e) { //按下esc退出 if (e.KeyChar == 27) { this.Close(); } } //完成截圖 private void lbSucess_Click(object sender, EventArgs e) { int clip_w = (int)((endX - startX) * x) - 4, clip_h = (int)((endY - startY) * y) - 4; if (clip_w < 1 || clip_h < 1) { return; } //獲取截圖 Bitmap clipBmp = new Bitmap(clip_w, clip_h); Graphics g = Graphics.FromImage(clipBmp); g.CopyFromScreen((int)(startX * x) + 2, (int)(startY * y) + 2, 0, 0, new Size(clip_w, clip_h), CopyPixelOperation.SourceCopy); //將截圖設置到剪切板 Clipboard.SetImage(clipBmp); g.Dispose(); this.Close(); } private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { //隱藏操作面板 panel1.Visible = false; //記錄鼠標開始截圖的位置 if (e.Button == MouseButtons.Left) { startX = e.X; startY = e.Y; endX = 0; endY = 0; } } private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) { //繪制截圖區域 DrawRect(e.X - startX, e.Y - startY, picGraphics); } } private void pictureBox1_MouseUp(object sender, MouseEventArgs e) { //截圖完成 if (e.Button == MouseButtons.Left) { endX = e.X; endY = e.Y; DrawRect(endX - startX, endY - startY, picGraphics); if (endX > startX && endY > startY) { //顯示操作面板 Thread.Sleep(100); panel1.Location = new Point(e.X - panel1.Width, e.Y + 5); panel1.Visible = true; } } } //繪制截圖區域 private void DrawRect(int w, int h,Graphics g) { Bitmap img = (Bitmap)BaseImage.Clone(); //雙緩沖技術畫矩形,防止重影和抖動 Graphics Painter = Graphics.FromImage(img); Painter.DrawRectangle(new Pen(Color.Red), startX * x, startY * y, w * x, h * y); g.DrawImage(img, 0, 0, img.Width / x, img.Height / y); Painter.Dispose(); img.Dispose(); }
實現效果
我這邊演示代碼很少做異常處理(前面也是,後面也是,畢竟不是做項目為主),大傢使用的時候根據情況自行處理下即可,亦或者可能會有內存未及時釋放的情況。
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