form1.h

网络编程入门。。。如何下载网页内容。。。如果有什么问题欢迎mail交流

#pragma once


namespace Example
{
	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace System::Net;
	using namespace System::IO;

	/// <summary> 
	/// Form1 摘要
	///
	/// 警告: 如果您更改该类的名称，则需要更改 
	///          与该类所依赖的所有 .resx 文件关联的托管资源编译器工具的 
	///          “资源文件名”属性。  否则，
	///          设计器将不能与此窗体关联的
	///          本地化资源正确交互。
	/// </summary>
	public __gc class Form1 : public System::Windows::Forms::Form
	{	
	public:
		Form1(void)
		{
			InitializeComponent();
		}
  
	protected:
		void Dispose(Boolean disposing)
		{
			if (disposing && components)
			{
				components->Dispose();
			}
			__super::Dispose(disposing);
		}
	private: System::Windows::Forms::Label *  label1;
	private: System::Windows::Forms::TextBox *  textBox1;
	private: System::Windows::Forms::TextBox *  textBox2;
	private: System::Windows::Forms::Label *  label2;
	private: System::Windows::Forms::Button *  button1;
	private: System::Windows::Forms::Button *  button2;

	private:
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		System::ComponentModel::Container * components;

		/// <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>
		void InitializeComponent(void)
		{
			this->label1 = new System::Windows::Forms::Label();
			this->textBox1 = new System::Windows::Forms::TextBox();
			this->textBox2 = new System::Windows::Forms::TextBox();
			this->label2 = new System::Windows::Forms::Label();
			this->button1 = new System::Windows::Forms::Button();
			this->button2 = new System::Windows::Forms::Button();
			this->SuspendLayout();
			// 
			// label1
			// 
			this->label1->Location = System::Drawing::Point(32, 32);
			this->label1->Name = S"label1";
			this->label1->Size = System::Drawing::Size(72, 16);
			this->label1->TabIndex = 0;
			this->label1->Text = S"网页地址：";
			// 
			// textBox1
			// 
			this->textBox1->Location = System::Drawing::Point(104, 24);
			this->textBox1->Name = S"textBox1";
			this->textBox1->Size = System::Drawing::Size(224, 21);
			this->textBox1->TabIndex = 1;
			this->textBox1->Text = S"http://www.163.com";
			// 
			// textBox2
			// 
			this->textBox2->Location = System::Drawing::Point(104, 56);
			this->textBox2->Name = S"textBox2";
			this->textBox2->Size = System::Drawing::Size(224, 21);
			this->textBox2->TabIndex = 3;
			this->textBox2->Text = S"C:\\My163com.htm";
			// 
			// label2
			// 
			this->label2->Location = System::Drawing::Point(32, 64);
			this->label2->Name = S"label2";
			this->label2->Size = System::Drawing::Size(72, 16);
			this->label2->TabIndex = 2;
			this->label2->Text = S"保存文件：";
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(56, 88);
			this->button1->Name = S"button1";
			this->button1->Size = System::Drawing::Size(96, 23);
			this->button1->TabIndex = 4;
			this->button1->Text = S"下载网页";
			this->button1->Click += new System::EventHandler(this, button1_Click);
			// 
			// button2
			// 
			this->button2->Location = System::Drawing::Point(200, 88);
			this->button2->Name = S"button2";
			this->button2->Size = System::Drawing::Size(96, 23);
			this->button2->TabIndex = 5;
			this->button2->Text = S"关闭程序";
			this->button2->Click += new System::EventHandler(this, button2_Click);
			// 
			// Form1
			// 
			this->AutoScaleBaseSize = System::Drawing::Size(6, 14);
			this->ClientSize = System::Drawing::Size(360, 134);
			this->Controls->Add(this->button2);
			this->Controls->Add(this->button1);
			this->Controls->Add(this->textBox2);
			this->Controls->Add(this->label2);
			this->Controls->Add(this->textBox1);
			this->Controls->Add(this->label1);
			this->MaximizeBox = false;
			this->Name = S"Form1";
			this->StartPosition = System::Windows::Forms::FormStartPosition::CenterScreen;
			this->Text = S"演示下载网页内容";
			this->ResumeLayout(false);

		}	
	private: System::Void button2_Click(System::Object *  sender, System::EventArgs *  e)
			 {//关闭程序
				 this->Close();
			 }

private: System::Void button1_Click(System::Object *  sender, System::EventArgs *  e)
		 {//下载网页
			 if(this->textBox1->get_Text()->get_Length()<1|this->textBox2->get_Text()->get_Length()<1)
			 {
				 MessageBox::Show("请输入目标网页地址或保存文件名","信息提示",MessageBoxButtons::OK,MessageBoxIcon::Information);
				 return;
			 }	
			 String* MyFileName=this->textBox2->get_Text();
			 String* MyURL=this->textBox1->get_Text();
			//加"http://"标志
			 if(MyURL->IndexOf("http://")==-1)
			 {		
				 MyURL=String::Concat("http://",MyURL);
			 }
			 HttpWebRequest* MyRequest =(HttpWebRequest*)WebRequest::Create(MyURL);
			 //发送请求，获取响应			 
			 HttpWebResponse* MyResponse = (HttpWebResponse*)MyRequest->GetResponse();			 
			 Stream* MyInStream;
			 FileStream* MyFileStream;
			 try
			 {
				MyInStream =MyResponse->GetResponseStream();
				long MyInBytes = MyResponse->get_ContentLength();
				//创建文件流对象				 
				MyFileStream=new FileStream(MyFileName,FileMode::OpenOrCreate, FileAccess::Write);
			    int MyLength = 1024;
				unsigned char MyBuffer __gc[]= new unsigned char  __gc[1025];
			    int bytesread = 0;
		        String* MyTemp="";
		        //从网络读取数据
				while((bytesread =MyInStream->Read(MyBuffer, 0, MyLength)) > 0)
				{	//把数据写入文件
			      MyFileStream->Write(MyBuffer, 0, bytesread);
				  MyTemp=String::Concat(MyTemp,System::Text::Encoding::Default->GetString(MyBuffer,0,bytesread));
			     }				
				MyInStream->Close();
				MyFileStream->Close();
				MessageBox::Show("下载网页成功！","信息提示",MessageBoxButtons::OK,MessageBoxIcon::Information); 	
        	}
			catch(Exception* Err)
			{
			    MyInStream->Close();
				MyFileStream->Close();
				MessageBox::Show(String::Concat("下载网页操作失败！错误是：",Err->get_Message()),"信息提示",MessageBoxButtons::OK,MessageBoxIcon::Information); 	
	 		}
		

	 }

};
}