。点击开始按钮 。a窗体隐藏，b窗体显示 scsysrq截图 。需要在桌面创建bc文件夹。
总的思路就是用钩子获取键盘信息 然后进行截图的线程控制
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace ex12
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(
IntPtr hWnd, // handle to destination window
int Msg, // message
int wParam, // first message parameter
int lParam // second message parameter
);
protected override void DefWndProc(ref Message m)
{
switch (m.Msg)
{
case HIDDEN_MM:
this.Hide();
break;
case SHOW:
this.Visible = true;
break;
default:
base.DefWndProc(ref m);
break;
}
}
public static IntPtr HWND;
public const int HIDDEN_MM = 0x500;
public const int SHOW = 0x521;
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
private const int WM_SYSKEYDOWN = 0x104;
private const int WM_SYSKEYUP = 0x105;
private const int VK_SNAPSHOT = 0x2C;
//全局的事件
static int hKeyboardHook = 0; //键盘钩子句柄
//鼠标常量
public const int WH_KEYBOARD_LL = 13; //keyboard hook constant
HookProc KeyboardHookProcedure; //声明键盘钩子回调事件.
//声明键盘钩子的封送结构类型
[StructLayout(LayoutKind.Sequential)]
public class KeyboardHookStruct
{
public int vkCode; //表示一个在 1 到 254 间的虚似键盘码
public int scanCode; //表示硬件扫描码
public int fags;
public int time;
public int dwExtraInfo;
}
//装置钩子的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance,
int threadId);
//卸下钩子的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
//下一个钩挂的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
[DllImport("user32")]
public static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[]
lpwTransKey, int fuState);
[DllImport("user32")]
public static extern int GetKeyboardState(byte[] pbKeyState);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
[DllImport("kernel32.dll")]
static extern int GetTickCount();
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
public static ManualResetEvent capture_terminate_e;
public static ManualResetEvent capture_this_one_e;
public static ManualResetEvent[] me_cap = new ManualResetEvent[2];
private void Start_h()
{
//安装键盘钩子
if (hKeyboardHook == 0)
{
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
Process curProcess = Process.GetCurrentProcess();
ProcessModule curModule = curProcess.MainModule;
hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, GetModuleHandle(curModule.ModuleName), 0);
if (hKeyboardHook == 0)
{
Stop_h();
throw new Exception("SetWindowsHookEx is failed.");
}
}
}
private void Stop_h()
{
bool retKeyboard = true;
if (hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
}
//如果卸下钩子失败
if (!(retKeyboard)) throw new Exception("UnhookWindowsHookEx failed.");
}
//键盘回调函数
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
//lParam 参数只是数据的内存地址
KeyboardHookStruct MyKeyboardHookStruct =
(KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
if (wParam == WM_KEYDOWN || wParam == WM_KEYDOWN)
{
//PrintScreen 负责执行单次捕捉
if (keyData == Keys.PrintScreen)
{
capture_this_one_e.Set();
}
//End 负责捕捉的任务结束
if (keyData == Keys.End)
{
capture_terminate_e.Set();
}
if (keyData == Keys.A)
{
SendMessage(HWND, HIDDEN_MM, 0, 0);
}
if (keyData == Keys.B)
{
SendMessage(HWND, SHOW, 0, 0);
}
}
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}
static void Capture_screen()
{
int s_wid = Screen.PrimaryScreen.Bounds.Width;
int s_height = Screen.PrimaryScreen.Bounds.Height;
Bitmap b_1 = new Bitmap(s_wid, s_height);
Graphics g_ = Graphics.FromImage(b_1);
//图片路径用户须重新设置，才可正常运行
String init_dir_fn = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
String dest_fn = null;
//用事件的方法来抓获图片
int index = WaitHandle.WaitAny(me_cap, 500);
while (index != 0)
{
if (index == 1)
{
dest_fn = init_dir_fn;
dest_fn += "\\bc\\";
dest_fn += GetTickCount().ToString();
dest_fn += "ab.bmp";
g_.CopyFromScreen(0, 0, 0, 0, new Size(s_wid, s_height));
b_1.Save(dest_fn, System.Drawing.Imaging.ImageFormat.Bmp);
capture_this_one_e.Reset();
}
index = WaitHandle.WaitAny(me_cap, 500);
}
g_.Dispose();
b_1.Dispose();
}
private void Form1_Load(object sender, EventArgs e)
{
HWND = this.Handle;
//ll = new ManualResetEvent(false);
}
private void button1_Click(object sender, EventArgs e)
{
Start_h();
//初始捕获终止事件为未结束
capture_terminate_e = new ManualResetEvent(false);
//初始捕获终止状态为未结束
capture_this_one_e = new ManualResetEvent(false);
me_cap[0] = capture_terminate_e;
me_cap[1] = capture_this_one_e;
//启动捕捉线程
ThreadStart workStart = new ThreadStart(Capture_screen);
Thread workThread = new Thread(workStart);
workThread.IsBackground = true;
workThread.Start();
}
}
}