window API的问题

Question

[DllImport("rasapi32.dll")]
public static extern int RasGetEntryDialParams(string pbook,IntPtr ipBuff,bool b);
/// <summary>
/// 枚举窗口
/// </summary>
[DllImport("user32.Dll")]
public static extern int EnumWindows(CallBack x, int y);  /// <summary>
/// 取窗口标题
/// </summary>
[DllImport("User32.Dll")]
public static extern void GetWindowText(IntPtr h, StringBuilder s, int nMaxCount);

Answer 1

还有一个：
//Declaring
public class clsAPI
{
/// <summary>
/// Shut down a XP
/// </summary>
#region
[StructLayout(LayoutKind.Sequential, Pack=1)]
public struct TokPriv1Luid
{
public int Count;
public long Luid;
public int Attr;
} [DllImport("kernel32.dll", ExactSpelling=true) ]
public static extern IntPtr GetCurrentProcess(); [DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]
public static extern bool OpenProcessToken( IntPtr h, int acc, ref IntPtr phtok ); [DllImport("advapi32.dll", SetLastError=true) ]
public static extern bool LookupPrivilegeValue( string host, string name, ref long pluid ); [DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]
public static extern bool AdjustTokenPrivileges( IntPtr htok, bool disall,
ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen ); [DllImport("user32.dll", ExactSpelling=true, SetLastError=true) ]
public static extern bool ExitWindowsEx( int flg, int rea ); public const int SE_PRIVILEGE_ENABLED = 0x00000002;
public const int TOKEN_QUERY = 0x00000008;
public const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
public const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
public const int EWX_LOGOFF = 0x00000000;
public const int EWX_SHUTDOWN = 0x00000001;
public const int EWX_REBOOT = 0x00000002;
public const int EWX_FORCE = 0x00000004;
public const int EWX_POWEROFF = 0x00000008;
public const int EWX_FORCEIFHUNG = 0x00000010;
#endregion
}//Calling
bool ok;
TokPriv1Luid tp;
IntPtr hproc = clsAPI.GetCurrentProcess();
IntPtr htok = IntPtr.Zero;
ok = clsAPI.OpenProcessToken( hproc, 
clsAPI.TOKEN_ADJUST_PRIVILEGES | clsAPI.TOKEN_QUERY, ref htok );
tp.Count = 1;
tp.Luid = 0;
tp.Attr = clsAPI.SE_PRIVILEGE_ENABLED;
ok = clsAPI.LookupPrivilegeValue( null, clsAPI.SE_SHUTDOWN_NAME, ref tp.Luid );
ok = clsAPI.AdjustTokenPrivileges( htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero );
ok = clsAPI.ExitWindowsEx(clsAPI.EWX_SHUTDOWN, 0 );

Answer 2

这儿是一个具体的例子：关机
http://www.ccw.com.cn/htm/app/aprog/01_9_14_4.asp
http://www.ccw.com.cn/htm/center/prog/02_10_9_6.asp

Answer 3

如果值是IntPtr类型，则可直接用"="
如果是int或long,则可以有IntPtr强制转换.
如
IntPtr p=new intPtr(1000);
int i=2000;
p=(IntPtr)i;

Answer 4

you look:
http://www.ccw.com.cn/htm/center/prog/02_10_9_6.asp http://www.ccw.com.cn/htm/app/aprog/01_9_14_4.asp
http://expert.csdn.net/Expert/FAQ/FAQ_Index.asp?id=6956
---------------------------------------------
using System; 
using System.Runtime.InteropServices; 
class Test 
{ 
    public enum DriveType 
    { 
        DRIVE_UNKNOWN = 0, 
        DRIVE_NO_ROOT_DIR = 1, 
        DRIVE_REMOVABLE = 2, 
        DRIVE_FIXED = 3, 
        DRIVE_REMOTE = 4, 
        DRIVE_CDROM = 5, 
        DRIVE_RAMDISK = 6 
    } 
     
    static public void Main(string[] args) 
    { 
        DriveType driveType = Test.GetDriveType(args[0]); 
        Console.WriteLine("Drive {0} is type {1}", args[0], driveType); 
    }     [DllImport("kernel32.dll")] 
    public static extern DriveType GetDriveType(string rootPathName); 
}调用查看驱动器类型的API
保存为 api.cs
用命令 csc.exe api.cs 编译成api.exe
执行   api.exe a:          就能显示驱动器A是Removable的
----------------------------------------------------
using System;
using System.Runtime.InteropServices; public class PinvokeApp
{ [DllImport("user32.dll",CharSet=CharSet.Unicode)]
static extern int MessageBoxW(int hWnd,string msg,string caption,int type);
//EntryPoint="MessageBoxA"
public static void Main()
{
int x=MessageBoxW(0,"Hello,World!","This is called from a C# App",6);
Console.Write(x); }
}
--------------------------------------------------------
use P/Invoke, like[DllImport("user32.dll")]
public static extern int GetClassName(int hwnd,
  [MarshalAs(UnmanagedType.LPStr)] StringBuilder buf,
  int nMaxCount);seehttp://msdn.microsoft.com/msdnmag/issues/02/08/CQA/