C#做外挂常用API

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices; //这个肯定要的

namespace WindowsApplication1
{
class win32API
{
public const int OPEN_PROCESS_ALL = 2035711;
public const int PAGE_READWRITE = 4;
public const int PROCESS_CREATE_THREAD = 2;
public const int PROCESS_HEAP_ENTRY_BUSY = 4;
public const int PROCESS_VM_OPERATION = 8;
public const int PROCESS_VM_READ = 256;
public const int PROCESS_VM_WRITE = 32;

private const int PAGE_EXECUTE_READWRITE = 0x4;
private const int MEM_COMMIT = 4096;
private const int MEM_RELEASE = 0x8000;
private const int MEM_DECOMMIT = 0x4000;
private const int PROCESS_ALL_ACCESS = 0x1F0FFF;

//查找窗体
[DllImport("User32.dll", EntryPoint = "FindWindow")]
public extern static IntPtr FindWindow(
string lpClassName,
string lpWindowName
);

//得到目标进程句柄的函数
[DllImport("USER32.DLL")]
public extern static int GetWindowThreadProcessId(
int hwnd,
ref int lpdwProcessId
);
[DllImport("USER32.DLL")]
public extern static int GetWindowThreadProcessId(
IntPtr hwnd,
ref int lpdwProcessId
);

//打开进程
[DllImport("kernel32.dll")]
public extern static int OpenProcess(
int dwDesiredAccess,
int bInheritHandle,
int dwProcessId
);
[DllImport("kernel32.dll")]
public extern static IntPtr OpenProcess(
uint dwDesiredAccess,
int bInheritHandle,
uint dwProcessId
);

//关闭句柄的函数
[DllImport("kernel32.dll", EntryPoint = "CloseHandle")]
public static extern int CloseHandle(
int hObject
);

//读内存
[DllImport("Kernel32.dll ")]
public static extern Int32 ReadProcessMemory(
IntPtr hProcess,
IntPtr lpBaseAddress,
[In, Out] byte[] buffer,
int size,
out IntPtr lpNumberOfBytesWritten
);
[DllImport("Kernel32.dll ")]
public static extern Int32 ReadProcessMemory(
int hProcess,
int lpBaseAddress,
ref int buffer,
//byte[] buffer,
int size,
int lpNumberOfBytesWritten
);
[DllImport("Kernel32.dll ")]
public static extern Int32 ReadProcessMemory(
int hProcess,
int lpBaseAddress,
byte[] buffer,
int size,
int lpNumberOfBytesWritten
);

//写内存
[DllImport("kernel32.dll")]
public static extern Int32 WriteProcessMemory(
IntPtr hProcess,
IntPtr lpBaseAddress,
[In, Out] byte[] buffer,
int size,
out IntPtr lpNumberOfBytesWritten
);

[DllImport("kernel32.dll")]
public static extern Int32 WriteProcessMemory(
int hProcess,
int lpBaseAddress,
byte[] buffer,
int size,
int lpNumberOfBytesWritten
);

//创建线程
[DllImport("kernel32", EntryPoint = "CreateRemoteThread")]
public static extern int CreateRemoteThread(
int hProcess,
int lpThreadAttributes,
int dwStackSize,
int lpStartAddress,
int lpParameter,
int dwCreationFlags,
ref int lpThreadId
);

//开辟指定进程的内存空间
[DllImport("Kernel32.dll")]
public static extern System.Int32 VirtualAllocEx(
System.IntPtr hProcess,
System.Int32 lpAddress,
System.Int32 dwSize,
System.Int16 flAllocationType,
System.Int16 flProtect
);

[DllImport("Kernel32.dll")]
public static extern System.Int32 VirtualAllocEx(
int hProcess,
int lpAddress,
int dwSize,
int flAllocationType,
int flProtect
);

//释放内存空间
[DllImport("Kernel32.dll")]
public static extern System.Int32 VirtualFreeEx(
int hProcess,
int lpAddress,
int dwSize,
int flAllocationType
);
}
}