Diskuze: Načtení asociovaného souboru
V předchozím kvízu, Test znalostí C# .NET online, jsme si ověřili nabyté zkušenosti z kurzu.
Člen
jt.e:24.2.2016 22:18
Takže asi hotovo.
//Program.cs
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace textshow
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
///
[STAThread]
static void Main()
{
IntPtr h = Native.FindWindowByCaption(IntPtr.Zero, "Prohlížeč 3.0");
if (IntPtr.Zero == h)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
else
{
String[] arguments = Environment.GetCommandLineArgs();
if (arguments.Length > 1)
{
SendParam(h, arguments[1]);
}
}
}
public static void SendParam(IntPtr hWnd, string message)
{
try
{
COPYDATASTRUCT cds;
cds.dwData = 2016;
cds.cbData = 0;
cds.lpData = message;
IntPtr strprt = Marshal.AllocHGlobal(Marshal.SizeOf(cds)); ;
Marshal.StructureToPtr(cds, strprt, false);
Native.SendMessage(hWnd, Native.WM_COPYDATA, IntPtr.Zero, strprt);
Native.IntPtrFree(ref strprt);
Native.SetForegroundWindow(hWnd);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
//-------------------------------------------------------------------------
public struct COPYDATASTRUCT
{
public int cbData;
public int dwData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;
}
//-------------------------------------------------------------------------
public static class Native
{
public const int WM_COPYDATA = 0x004A;
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
[DllImport("user32.dll", EntryPoint = "FindWindow")]
public static extern IntPtr FindWindowByCaption(IntPtr ZeroOnly, string lpWindowName);
[DllImport("user32.dll")]
public static extern bool SetForegroundWindow(IntPtr hWnd);
public static void IntPtrFree(ref IntPtr preAllocated)
{
if (IntPtr.Zero == preAllocated) return;
Marshal.FreeHGlobal(preAllocated);
preAllocated = IntPtr.Zero;
}
}
//-------------------------------------------------------------------------
}
//============================================
//Form1.cs
using System;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
namespace textshow
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void LoadFromFile(string filename)
{
try
{
using (StreamReader r = new StreamReader(filename, Encoding.Default, true))
{
textBox1.Clear();
textBox1.Text = r.ReadToEnd();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
public void LoadParams()
{
String[] arguments = Environment.GetCommandLineArgs();
if (arguments.Length > 1)
{
if (File.Exists(arguments[1])) LoadFromFile(arguments[1]);
}
}
private void Form1_Shown(object sender, EventArgs e)
{
LoadParams();
}
protected override void WndProc(ref Message m)
{
if(m.Msg == Native.WM_COPYDATA)
{
try
{
COPYDATASTRUCT cds;
cds = (COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam, typeof(COPYDATASTRUCT));
if (cds.dwData == 2016)
{
LoadFromFile(cds.lpData);
}
}
catch (Exception ex)
{
textBox1.Text = ex.Message;
}
}
base.WndProc(ref m);
}
}
}
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