C#unsafe不安全指针的使用

1、打开或创建一个新的WinFrom工程，在解决方案资源管理器中选中当前工程项目，鼠标右击，弹出右键菜单，移动鼠标点击【属性】，弹出属性界面，选择【生成】项，勾选中【允许不安全代码】

2、保存工程项目，关闭属性页面。选中Form1.cs页面，增加帮助菜单项和Label一个，用于提莲镘拎扇示软件功能和软件执行进度。设置Form1窗口允许拖放功能及瘦霪池熘拖放事件。界面设计代码如下：partial class Form1 { /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1)); this.label1 = new System.Windows.Forms.Label(); this.menuStrip1 = new System.Windows.Forms.MenuStrip(); this.帮助ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.menuStrip1.SuspendLayout(); this.SuspendLayout(); // // label1 // this.label1.AutoSize = true; this.label1.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.label1.Location = new System.Drawing.Point(86, 98); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(56, 16); this.label1.TabIndex = 0; this.label1.Text = "label1"; // // menuStrip1 // this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { this.帮助ToolStripMenuItem}); this.menuStrip1.Location = new System.Drawing.Point(0, 0); this.menuStrip1.Name = "menuStrip1"; this.menuStrip1.Size = new System.Drawing.Size(446, 25); this.menuStrip1.TabIndex = 1; this.menuStrip1.Text = "menuStrip1"; // // 帮助ToolStripMenuItem // this.帮助ToolStripMenuItem.Name = "帮助ToolStripMenuItem"; this.帮助ToolStripMenuItem.Size = new System.Drawing.Size(44, 21); this.帮助ToolStripMenuItem.Text = "帮助"; this.帮助ToolStripMenuItem.Click += new System.EventHandler(this.帮助ToolStripMenuItem_Click); // // Form1 // this.AllowDrop = true; this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(446, 236); this.Controls.Add(this.label1); this.Controls.Add(this.menuStrip1); this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon"))); this.MainMenuStrip = this.menuStrip1; this.Name = "Form1"; this.Text = "看到开发版Raw12转RAW8"; this.DragDrop += new System.Windows.Forms.DragEventHandler(this.Form1_DragDrop); this.DragEnter += new System.Windows.Forms.DragEventHandler(this.Form1_DragEnter); this.menuStrip1.ResumeLayout(false); this.menuStrip1.PerformLayout(); this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Label label1; private System.Windows.Forms.MenuStrip menuStrip1; private System.Windows.Forms.ToolStripMenuItem 帮助ToolStripMenuItem; }

3、为From1添加代码： public partial class Form1 : Form { public unsafe Form1() { InitializeComponent(); this.label1.Text = "将需要转Raw12文件拖动到当前窗口"; } private unsafe void Form1_DragDrop(object sender, DragEventArgs e) { string[] s = (string[])e.Data.GetData(DataFormats.FileDrop, false); dynamic path = s[0]; System.IO.FileStream fs = new System.IO.FileStream(path, System.IO.FileMode.Open); byte[] bs = new byte[fs.Length]; byte[] bs2 = new byte[fs.Length / 2]; fs.Read(bs, 0, bs.Length); fs.Close(); fixed (byte* b = bs, b2 = bs2) { ushort* u = (ushort*)b; byte* p = b2; for (int i = 0; i < bs2.Length; i++) { int u2 = *u - 200; if (u2 <= 0) { u2 = 0; } *p = (byte)(u2 / 16); p++; u++; } } System.IO.FileStream fs2 = new System.IO.FileStream(path + "[8]" + ".raw", System.IO.FileMode.Create); fs2.Write(bs2, 0, bs2.Length); fs2.Flush(); fs2.Close(); this.label1.Text = System.IO.Path.GetFileName(path) + " 转8位完成"; } private void Form1_DragEnter(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect= DragDropEffects.All; else e.Effect = DragDropEffects.None; } private void 帮助ToolStripMenuItem_Click(object sender, EventArgs e) { MessageBox.Show("将需要转的文件拖动到窗口\r\n该软件支持12位RawData数据转换成8位RawData\r\n\r\n"); } }