в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:20:17Z

1 версия

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==API File reader==

<source lang="csharp">using System;
using System.Runtime.InteropServices;
using System.Text;
class APIFileReader
{
uint GenericRead = 0x80000000;
uint OpenExisting = 3;
uint UseDefault = 0;
int fileHandle;
[DllImport("kernel32", SetLastError = true)]
static extern unsafe int CreateFile(string filename,uint desiredAccess,uint shareMode,uint attributes,uint creationDisposition,uint flagsAndAttributes,uint templateFile);
[DllImport("kernel32", SetLastError = true)]
static extern unsafe bool ReadFile(int hFile,void* lpBuffer,int nBytesToRead,int* nBytesRead,int overlapped);
public APIFileReader(string filename)
{
fileHandle = CreateFile(filename,GenericRead, UseDefault, UseDefault, OpenExisting,UseDefault, UseDefault);
}
public unsafe int Read(byte[] buffer, int index, int count)
{
int bytesRead = 0;
fixed (byte* bytePointer = buffer)
{
ReadFile(fileHandle, bytePointer + index, count, &bytesRead, 0);
}
return bytesRead;
}
}
class Test
{
public static void Main()
{
APIFileReader fileReader = new APIFileReader("data.txt");
int BuffSize = 128;
byte[] buffer = new byte[BuffSize];
ASCIIEncoding asciiEncoder = new ASCIIEncoding();
while (fileReader.Read(buffer, 0, BuffSize) != 0)
{
Console.Write("{0}", asciiEncoder.GetString(buffer));
}
}
}</source>

==DllImport==

<source lang="csharp">using System;
using System.Runtime.InteropServices;
class MainClass
{
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int MessageBox(int hWnd, String text, String caption, uint type);
[STAThread]
static void Main(string[] args)
{
MessageBox(0, "Hello World", "MyBox", 1);
}
}</source>

==DllImport: load dll library==

<source lang="csharp">using System;
using System.Runtime.InteropServices;
public sealed class MainClass
{
[DllImport("kernel32.dll")]
static extern IntPtr HeapCreate(uint flOptions, UIntPtr dwInitialSize,UIntPtr dwMaximumSize);
[DllImport("kernel32.dll")]
static extern bool HeapDestroy(IntPtr hHeap);
public static void Main() {
IntPtr theHeap = HeapCreate( 0, (UIntPtr) 4096, UIntPtr.Zero );
HeapDestroy( theHeap );
theHeap = IntPtr.Zero;
}
}</source>

==External Method==

<source lang="csharp">using System;
using System.Text;
using System.Runtime.InteropServices;
class MainClass
{
[DllImport("kernel32", SetLastError = true)]
public static extern int GetCurrentDirectory(int a, StringBuilder b);
static void Main()
{
StringBuilder sb = new StringBuilder();
sb.Length = 250;
GetCurrentDirectory(250, sb);
Console.WriteLine(sb);
}
}</source>

==Get address of a method from Dll==

<source lang="csharp">using System;
using System.Threading;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Text;
class Program
{
[DllImport("kernel32.dll")]
static extern IntPtr LoadLibrary(string dllName);
[DllImport("kernel32.dll")]
static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
delegate int MessageBoxDelegate(IntPtr hwnd,
[MarshalAs(UnmanagedType.LPWStr)]string text,
[MarshalAs(UnmanagedType.LPWStr)]string caption,
int type);
static void Main(string[] args)
{
IntPtr userApi = LoadLibrary("user32.dll");
IntPtr msgBoxAddress = GetProcAddress(userApi, "MessageBoxW"); // unicode (wide) message box
MessageBoxDelegate mbd = (MessageBoxDelegate)Marshal.GetDelegateForFunctionPointer(msgBoxAddress,typeof(MessageBoxDelegate));
mbd(IntPtr.Zero, "A", "B", 0);
DoSomething(mbd);
}
static void DoSomething(MessageBoxDelegate mbd)
{
mbd(IntPtr.Zero, "Work completed.", "Work Progress", 0);
}
}</source>

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в 15:31, 26 мая 2010

Admin: 1 версия