📄 form2.cs
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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace mcaoWindowsAppException
{
/// <summary>
/// Form2 的摘要说明。
/// </summary>
public class Form2 : System.Windows.Forms.Form
{
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBoxInt;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBoxResult;
private System.Windows.Forms.Button buttonFunc;
private System.Windows.Forms.GroupBox groupBox2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox textBoxIntAlloc;
private System.Windows.Forms.TextBox textBoxAllocResult;
private System.Windows.Forms.Button buttonIntAlloc;
private System.Windows.Forms.GroupBox groupBox3;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox textBoxStringInput;
private System.Windows.Forms.TextBox textBoxStringResult;
private System.Windows.Forms.Button buttonStringPointResult;
private System.Windows.Forms.Button buttonPointVisit;
private System.Windows.Forms.Button buttonPointExchange;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form2()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if(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()
{
this.groupBox1 = new System.Windows.Forms.GroupBox();
this.textBoxInt = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.textBoxResult = new System.Windows.Forms.TextBox();
this.buttonFunc = new System.Windows.Forms.Button();
this.groupBox2 = new System.Windows.Forms.GroupBox();
this.label3 = new System.Windows.Forms.Label();
this.textBoxIntAlloc = new System.Windows.Forms.TextBox();
this.textBoxAllocResult = new System.Windows.Forms.TextBox();
this.buttonIntAlloc = new System.Windows.Forms.Button();
this.groupBox3 = new System.Windows.Forms.GroupBox();
this.label4 = new System.Windows.Forms.Label();
this.textBoxStringInput = new System.Windows.Forms.TextBox();
this.textBoxStringResult = new System.Windows.Forms.TextBox();
this.buttonStringPointResult = new System.Windows.Forms.Button();
this.buttonPointVisit = new System.Windows.Forms.Button();
this.buttonPointExchange = new System.Windows.Forms.Button();
this.groupBox1.SuspendLayout();
this.groupBox2.SuspendLayout();
this.groupBox3.SuspendLayout();
this.SuspendLayout();
//
// groupBox1
//
this.groupBox1.Controls.Add(this.textBoxInt);
this.groupBox1.Controls.Add(this.label1);
this.groupBox1.Controls.Add(this.label2);
this.groupBox1.Controls.Add(this.textBoxResult);
this.groupBox1.Controls.Add(this.buttonFunc);
this.groupBox1.Location = new System.Drawing.Point(8, 8);
this.groupBox1.Name = "groupBox1";
this.groupBox1.Size = new System.Drawing.Size(368, 104);
this.groupBox1.TabIndex = 0;
this.groupBox1.TabStop = false;
this.groupBox1.Text = "测试指针作为out和ref类型的形参";
//
// textBoxInt
//
this.textBoxInt.Location = new System.Drawing.Point(8, 48);
this.textBoxInt.Name = "textBoxInt";
this.textBoxInt.Size = new System.Drawing.Size(96, 21);
this.textBoxInt.TabIndex = 1;
this.textBoxInt.Text = "";
//
// label1
//
this.label1.Location = new System.Drawing.Point(8, 24);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(112, 16);
this.label1.TabIndex = 0;
this.label1.Text = "请输入一个整数：";
//
// label2
//
this.label2.Location = new System.Drawing.Point(136, 24);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(216, 48);
this.label2.TabIndex = 0;
this.label2.Text = "定义两个指针，一个指向输入的正数的地址，做ref形参，一个不指向该地址，做out形参，结果如下：";
//
// textBoxResult
//
this.textBoxResult.Location = new System.Drawing.Point(136, 72);
this.textBoxResult.Name = "textBoxResult";
this.textBoxResult.ReadOnly = true;
this.textBoxResult.Size = new System.Drawing.Size(216, 21);
this.textBoxResult.TabIndex = 1;
this.textBoxResult.Text = "";
//
// buttonFunc
//
this.buttonFunc.Location = new System.Drawing.Point(8, 72);
this.buttonFunc.Name = "buttonFunc";
this.buttonFunc.Size = new System.Drawing.Size(96, 24);
this.buttonFunc.TabIndex = 1;
this.buttonFunc.Text = "传递结果";
this.buttonFunc.Click += new System.EventHandler(this.buttonFunc_Click);
//
// groupBox2
//
this.groupBox2.Controls.Add(this.label3);
this.groupBox2.Controls.Add(this.textBoxIntAlloc);
this.groupBox2.Controls.Add(this.textBoxAllocResult);
this.groupBox2.Controls.Add(this.buttonIntAlloc);
this.groupBox2.Location = new System.Drawing.Point(8, 120);
this.groupBox2.Name = "groupBox2";
this.groupBox2.Size = new System.Drawing.Size(136, 152);
this.groupBox2.TabIndex = 1;
this.groupBox2.TabStop = false;
this.groupBox2.Text = "堆栈申请测试";
//
// label3
//
this.label3.Location = new System.Drawing.Point(8, 24);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(112, 16);
this.label3.TabIndex = 0;
this.label3.Text = "请输入一个整数：";
//
// textBoxIntAlloc
//
this.textBoxIntAlloc.Location = new System.Drawing.Point(8, 40);
this.textBoxIntAlloc.Name = "textBoxIntAlloc";
this.textBoxIntAlloc.Size = new System.Drawing.Size(104, 21);
this.textBoxIntAlloc.TabIndex = 1;
this.textBoxIntAlloc.Text = "";
//
// textBoxAllocResult
//
this.textBoxAllocResult.Location = new System.Drawing.Point(8, 96);
this.textBoxAllocResult.Multiline = true;
this.textBoxAllocResult.Name = "textBoxAllocResult";
this.textBoxAllocResult.ReadOnly = true;
this.textBoxAllocResult.Size = new System.Drawing.Size(104, 40);
this.textBoxAllocResult.TabIndex = 1;
this.textBoxAllocResult.Text = "";
//
// buttonIntAlloc
//
this.buttonIntAlloc.Location = new System.Drawing.Point(8, 66);
this.buttonIntAlloc.Name = "buttonIntAlloc";
this.buttonIntAlloc.Size = new System.Drawing.Size(104, 24);
this.buttonIntAlloc.TabIndex = 1;
this.buttonIntAlloc.Text = "申请结果";
this.buttonIntAlloc.Click += new System.EventHandler(this.buttonIntAlloc_Click);
//
// groupBox3
//
this.groupBox3.Controls.Add(this.label4);
this.groupBox3.Controls.Add(this.textBoxStringInput);
this.groupBox3.Controls.Add(this.textBoxStringResult);
this.groupBox3.Controls.Add(this.buttonStringPointResult);
this.groupBox3.Controls.Add(this.buttonPointVisit);
this.groupBox3.Controls.Add(this.buttonPointExchange);
this.groupBox3.Location = new System.Drawing.Point(152, 128);
this.groupBox3.Name = "groupBox3";
this.groupBox3.Size = new System.Drawing.Size(224, 144);
this.groupBox3.TabIndex = 1;
this.groupBox3.TabStop = false;
this.groupBox3.Text = "指针和fixed语句测试";
//
// label4
//
this.label4.Location = new System.Drawing.Point(8, 24);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(96, 16);
this.label4.TabIndex = 0;
this.label4.Text = "请输入字符串：";
//
// textBoxStringInput
//
this.textBoxStringInput.Location = new System.Drawing.Point(8, 40);
this.textBoxStringInput.Name = "textBoxStringInput";
this.textBoxStringInput.Size = new System.Drawing.Size(58, 21);
this.textBoxStringInput.TabIndex = 1;
this.textBoxStringInput.Text = "";
//
// textBoxStringResult
//
this.textBoxStringResult.Location = new System.Drawing.Point(117, 15);
this.textBoxStringResult.Multiline = true;
this.textBoxStringResult.Name = "textBoxStringResult";
this.textBoxStringResult.ReadOnly = true;
this.textBoxStringResult.Size = new System.Drawing.Size(102, 121);
this.textBoxStringResult.TabIndex = 1;
this.textBoxStringResult.Text = "";
//
// buttonStringPointResult
//
this.buttonStringPointResult.Location = new System.Drawing.Point(72, 41);
this.buttonStringPointResult.Name = "buttonStringPointResult";
this.buttonStringPointResult.Size = new System.Drawing.Size(39, 24);
this.buttonStringPointResult.TabIndex = 1;
this.buttonStringPointResult.Text = "结果";
this.buttonStringPointResult.Click += new System.EventHandler(this.buttonStringPointResult_Click);
//
// buttonPointVisit
//
this.buttonPointVisit.Location = new System.Drawing.Point(5, 70);
this.buttonPointVisit.Name = "buttonPointVisit";
this.buttonPointVisit.Size = new System.Drawing.Size(105, 24);
this.buttonPointVisit.TabIndex = 1;
this.buttonPointVisit.Text = "指针访问结果";
this.buttonPointVisit.Click += new System.EventHandler(this.buttonPointVisit_Click);
//
// buttonPointExchange
//
this.buttonPointExchange.Location = new System.Drawing.Point(5, 104);
this.buttonPointExchange.Name = "buttonPointExchange";
this.buttonPointExchange.Size = new System.Drawing.Size(105, 24);
this.buttonPointExchange.TabIndex = 1;
this.buttonPointExchange.Text = "指针转换结果";
this.buttonPointExchange.Click += new System.EventHandler(this.buttonPointExchange_Click);
//
// Form2
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(384, 277);
this.Controls.Add(this.groupBox2);
this.Controls.Add(this.groupBox1);
this.Controls.Add(this.groupBox3);
this.Name = "Form2";
this.Text = "不安全代码的测试";
this.groupBox1.ResumeLayout(false);
this.groupBox2.ResumeLayout(false);
this.groupBox3.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
//为了测试将指针作为函数形参，所以定义该函数
static int value = 20;
unsafe static void F(out int* pi1, ref int* pi2)
{
//string strTemp = textBoxInt.Text;
//int i = int.Parse(strTemp);
int i = 10;
pi1 = &i;
fixed (int* pj = &value)
{
// ...
pi2 = pj;
}
}
private void buttonFunc_Click(object sender, System.EventArgs e)
{
int i = int.Parse(textBoxInt.Text.ToString());
unsafe
{
int* px1;
int* px2 = &i;
F(out px1, ref px2);// undefined behavior
textBoxResult.Text = "*px1 = " + (*px1).ToString() + ", *px2 = " + (*px2).ToString();
}
}
//堆栈分配例子
public string MyHeapStackAllocTest(int value)
{
int n = value >= 0? value: -value;
unsafe
{
char* buffer = stackalloc char[16];
char* p = buffer + 16;
do
{
*--p = (char)(n % 10 + '0');
n /= 10;
} while (n != 0);
if (value < 0) *--p = '-';
return new string(p, 0, (int)(buffer + 16 - p));
}
}
private void buttonIntAlloc_Click(object sender, System.EventArgs e)
{
//堆栈分配例子--int
int i = int.Parse(textBoxIntAlloc.Text.ToString());
string tempStr = this.MyHeapStackAllocTest(i);
tempStr += "\n" + "You alloc " + tempStr.Length + " size together!";
textBoxAllocResult.Text = tempStr;
}
//测试fixed语句，以string类型为例//
//unsafe static void MyFixedTestSalve(char* p)
unsafe static string MyFixedTestSalve(char* p)
{
string tempStr = "";
//textBoxStringResult.Text = "";
for (int i = 0; p[i] != '\0'; ++i)
//MessageBox.Show(p[i].ToString());
tempStr += p[i].ToString();
//this.textBoxStringResult.Text = "";
return tempStr;
}
private void buttonStringPointResult_Click(object sender, System.EventArgs e)
{
string tempStr = textBoxStringInput.Text;
unsafe
{
fixed (char* p = tempStr) tempStr = MyFixedTestSalve(p);
this.textBoxStringResult.Text = tempStr;
fixed (char* p = "xx") tempStr += MyFixedTestSalve(p);
this.textBoxStringResult.Text = tempStr;
}
}
//指针成员访问
//先定义结构，然后访问
struct Point
{
public int x;
public int y;
public override string ToString()
{
return "(" + x + "," + y + ")";
}
}
private void buttonPointVisit_Click(object sender, System.EventArgs e)
{
//
Point point;
unsafe
{
Point* p = &point;
p->x = 10;
p->y = 20;
this.textBoxStringResult.Text = "First visited format " + p->ToString();
(*p).x = 10;
(*p).y = 20;
this.textBoxStringResult.Text += "\nSecond visited format" + (*p).ToString();
}
}
private void buttonPointExchange_Click(object sender, System.EventArgs e)
{
//测试指针类型隐式/显式转换
double d = 123.456e23;
int j;
unsafe
{
char c = 'A';
char* pc = &c;
void* pv = pc;
int* pi = (int*)pv;
int i = *pi; // undefined
*pi = 123456; // undefined
byte* pb = (byte*)&d;
string MyStr = "";
for (j = 0; j < sizeof(double); ++j)
//Console.Write("{0:X2} ", *pb++);
MyStr += *pb++;
//Console.WriteLine();
this.textBoxStringResult.Text = MyStr;
}
}
//
//
}
}
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