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，用于提示软件功能和软件执行进度。设置Form1窗口允许拖放功能及拖放事件。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");
}
}
