Q:如何在XMl文檔中某個節點位置加入一些節點,不是整個檔案寫
A:XmlDocument xmldoc = new XmlDocument();
xmlDoc.Load( filePath );
XmlNode root = xmlDoc.DocumentElement.SelectSingleNode( xPath );
XmlNode newElem=xmlDoc.CreateNode(XmlNodeType.Element, "pages", "");
root.AppendChild( newElem );
xmlDoc.Save(filePath);
---------------------------------------------------------------
TextWriter tw=new StreamWriter(@"C:\csharp\06\iverson.xml");
XmlTextWriter writer=new XmlTextWriter(tw);
writer.WriteStartElement("Human");
writer.WriteComment("this is test sample");
writer.WriteStartElement("Name");
writer.WriteString("Iverson");
writer.WriteEndElement();
writer.WriteElementString("tel","13020024783");
writer.WriteStartElement("Jobs");
writer.WriteStartAttribute("Job1",null);
writer.WriteString("Author");
writer.WriteEndAttribute();
writer.WriteStartAttribute("Job2",null);
writer.WriteString("Teacher");
writer.WriteEndAttribute();
writer.WriteEndElement();
writer.WriteEndElement();
writer.Close();
Q:c#開發winform,怎麼去執行一個外部的exe檔案?
象vb的shell那樣!
A: 單純的執行比較簡單:
Process myProcess = new Process();
ProcessStartInfo myProcessStartInfo = new ProcessStartInfo();
myProcessStartInfo.FileName = "Netpad";
myProcess.StartInfo = myProcessStartInfo;
myProcess.Start();
但我的問題就比較麻煩了了
---------------------------------------------------------------
using System.Diagnostics;
Process.Start("外部的exe檔案");
例如:
try
{
Process.Start("regedit");//啟動登錄編輯程式
}
catch
{
MessageBox.Show("程式啟動出錯");
}
---------------------------------------------------------------
Process.Start("外部的exe檔案");
開啟一個進程就好了
Q:我想在兩個程式間交換資料,該如何??
A:方法1:
通過資料庫
方法二:
設定檔
如果是webform的話:可以用Session
wish u good luck
Greatsft
---------------------------------------------------------------
兩種方法,一種是把資料寫入到檔案,另一個程式去讀!
第二種方法,用socket,自己定義一個通道,相互間通訊,就好像通過網路通訊一樣,但其實是在同一台電腦上!前提是要有Tcp/Ip環境!而且比較適合對資料及時性要求較高的。
以上兩種方法都是比較簡單的,我以為。
最好是去看看有沒有可能用全域Dll調用的方法,進行進程間的共用!不過本人目前還沒有這方面的經驗!
---------------------------------------------------------------
如果兩個程式之間只是資料通訊,可以採用以下方法:
1、通過共用檔案或資料庫
2、通過管道
3、通過郵槽
4、通過Socket
5、其它
如果兩個程式之間不僅是資料通訊,而且是處理通訊(即程式A可以調用程式B的方法),可以採用以下方法:
1、Dcom
2、.net Remoting
3、Web Service
---------------------------------------------------------------
進程之間通訊的幾種方法:
在Windows程式中,各個進程之間常常需要交換資料,進行資料通訊。常用的方法有
使用記憶體對應檔
通過共用記憶體DLL共用記憶體
使用SendMessage向另一進程發送WM_COPYDATA訊息
比起前兩種的複雜實現來,WM_COPYDATA訊息無疑是一種經濟實惠的一中方法.
WM_COPYDATA訊息的主要目的是允許在進程間傳遞唯讀資料。Windows在通過WM_COPYDATA訊息傳遞期間,不提供繼承同步方式。SDK文檔推薦使用者使用SendMessage函數,接受方在資料拷貝完成前不返回,這樣發送方就不可能刪除和修改資料:
這個函數的原型及其要用到的結構如下:
SendMessage(hwnd,WM_COPYDATA,wParam,lParam);
其中,WM_COPYDATA對應的十六進位數為0x004A
wParam設定為包含資料的視窗的控制代碼。lParam指向一個COPYDATASTRUCT的結構:
typedef struct tagCOPYDATASTRUCT{
DWORD dwData;//使用者定義資料
DWORD cbData;//資料大小
PVOID lpData;//指向資料的指標
}COPYDATASTRUCT;
該結構用來定義使用者資料。
具體過程如下:
首先,在發送方,用FindWindow找到接受方的控制代碼,然後向接受方發送WM_COPYDATA訊息.
接受方在DefWndProc事件中,來處理這條訊息.由於中文編碼是兩個位元組,所以傳遞中文時候位元組長度要搞清楚.
體代碼如下:
//---------------------------------------------------
//發送方:
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace WinFormSendMsg
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.ComponentModel.Container components = null;
const int WM_COPYDATA = 0x004A;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(184, 24);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(128, 21);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "textBox1";
//
// button1
//
this.button1.Location = new System.Drawing.Point(344, 16);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(112, 32);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(536, 142);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.button1,
this.textBox1});
this.Name = "Form1";
this.Text = "發送方表單";
this.ResumeLayout(false);
}
static void Main()
{
Application.Run(new Form1());
}
[DllImport("User32.dll",EntryPoint="SendMessage")]
private static extern int SendMessage(
int hWnd, // handle to destination window
int Msg, // message
int wParam, // first message parameter
ref COPYDATASTRUCT lParam // second message parameter
);
[DllImport("User32.dll",EntryPoint="FindWindow")]
private static extern int FindWindow(string lpClassName,string
lpWindowName);
private void button1_Click(object sender, System.EventArgs e)
{
int WINDOW_HANDLER = FindWindow(null,@"接收方表單");
if(WINDOW_HANDLER == 0)
{
}
else
{
byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
int len = sarr.Length;
COPYDATASTRUCT cds;
cds.dwData = (IntPtr) 100;
cds.lpData = this.textBox1.Text;
cds.cbData = len + 1;
SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
}
}
}
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)] public string lpData;
}
}
//---------------------------------------------------
//接受方
//---------------------------------------------------
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
namespace WindowsFormGetMsg
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.ComponentModel.Container components = null;
const int WM_COPYDATA = 0x004A;
public Form1()
{
InitializeComponent();
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(176, 32);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(160, 21);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "textBox1";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(432, 266);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.textBox1});
this.Name = "Form1";
this.Text = "接收方表單";
this.ResumeLayout(false);
}
static void Main()
{
Application.Run(new Form1());
}
protected override void DefWndProc(ref System.Windows.Forms.Message m)
{
switch(m.Msg)
{
case WM_COPYDATA:
COPYDATASTRUCT mystr = new COPYDATASTRUCT();
Type mytype = mystr.GetType();
mystr =(COPYDATASTRUCT)m.GetLParam(mytype);
this.textBox1.Text =mystr.lpData;
break;
default:
base.DefWndProc(ref m);
break;
}
}
}
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)] public string lpData;
}
}
將2進位數群組轉換成圖片檔案。
轉換成2進位數組
public static byte[] GetFileBytes(string Filename)
{
if(Filename == "")
return null;
FileStream fileStream = new FileStream(Filename,FileMode.Open,FileAccess.Read);
BinaryReader binaryReader = new BinaryReader(fileStream);
byte[] fileBytes = binaryReader.ReadBytes((int)fileStream.Length);
binaryReader.Close();
fileStream.Close();
return fileBytes;
}
將2進位數群組轉換成檔案
FileStream fileStream = new FileStream("檔案路徑",FileMode.OpenOrCreate,FileAccess.Write);
BinaryWriter binaryWriter = new BinaryWriter(fileStream);
binaryWriter.Write(fileBytes);
binaryWriter.Flush();
binaryWriter.Close();
fileStream.Close();