本文实例讲述了c#使用钩子获得按键信息的方法。分享给大家供大家参考。具体如下：
窗体相关代码：
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using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.runtime.interopservices;
using system.threading;
using readbadcode;
namespace gouzi
{
public partial class form2 : form
{
barcodehook barcode = new barcodehook();
public form2()
{
initializecomponent();
barcode.barcodeevent += new barcodehook.barcodedelegate(barcode_barcodeevent);
}
private delegate void showinfodelegate(barcodehook.barcodes barcode);
private void showinfo(barcodehook.barcodes barcode)
{
if (this.invokerequired)
{
this.begininvoke(new showinfodelegate(showinfo), new object[] { barcode });
}
else
{
textbox1.text = barcode.keyname;//键名
textbox2.text = barcode.virtkey.tostring();//虚拟码
textbox3.text = barcode.scancode.tostring();//扫描码
textbox4.text = barcode.ascii.tostring();//ascii
textbox5.text = barcode.chr.tostring();//字符
textbox6.text = barcode.isvalid ? barcode.barcode : "";
//在这里进行键入值
}
}
void barcode_barcodeevent(barcodehook.barcodes barcode)
{
showinfo(barcode);
}
private void form2_load(object sender, eventargs e)
{
barcode.start();
}
private void form2_stylechanged(object sender, eventargs e)
{
barcode.stop();
}
}
}
后台类代码：
using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.runtime.interopservices;
using system.reflection;
namespace readbadcode
{
class barcodehook
{
public delegate void barcodedelegate(barcodes barcode);
public event barcodedelegate barcodeevent;
public struct barcodes
{
public int virtkey; //虚拟码
public int scancode; //扫描码
public string keyname; //键名
public uint ascii; //ascii
public char chr; //字符
public string barcode; //条码信息
public bool isvalid; //条码是否有效
public datetime time; //扫描时间
}
private struct eventmsg
{
public int message;
public int paraml;
public int paramh;
public int time;
public int hwnd;
}
// 安装钩子
[dllimport("user32.dll", charset = charset.auto, callingconvention = callingconvention.stdcall)]
private static extern int setwindowshookex(int idhook, hookproc lpfn, intptr hinstance, int threadid);
// 卸载钩子
[dllimport("user32.dll", charset = charset.auto, callingconvention = callingconvention.stdcall)]
private static extern bool unhookwindowshookex(int idhook);
// 继续下一个钩子
[dllimport("user32.dll", charset = charset.auto, callingconvention = callingconvention.stdcall)]
private static extern int callnexthookex(int idhook, int ncode, int32 wparam, intptr lparam);
//获取键名的字符串
[dllimport("user32", entrypoint = "getkeynametext")]
private static extern int getkeynametext(int lparam, stringbuilder lpbuffer, int nsize);
//将256个虚拟键复制到指定的缓冲区中
[dllimport("user32", entrypoint = "getkeyboardstate")]
private static extern int getkeyboardstate(byte[] pbkeystate);
//将指定的虚拟键码和键盘状态为相应的字符串
[dllimport("user32", entrypoint = "toascii")]
private static extern bool toascii(int virtualkey, int scancode, byte[] lpkeystate, ref uint lpchar, int uflags);
//声明定义回调函数
delegate int hookproc(int ncode, int32 wparam, intptr lparam);
barcodes barcode = new barcodes();
int hkeyboardhook = 0;
string strbarcode = "";
private int keyboardhookproc(int ncode, int32 wparam, intptr lparam)
{
if (ncode == 0)
{
eventmsg msg = (eventmsg)marshal.ptrtostructure(lparam, typeof(eventmsg));
if (wparam == 0x100) //wm_keydown = 0x100
{
barcode.virtkey = msg.message & 0xff; //虚拟码
barcode.scancode = msg.paraml & 0xff; //扫描码
stringbuilder strkeyname = new stringbuilder(255);
if (getkeynametext(barcode.scancode * 65536, strkeyname, 255) > 0)
{
barcode.keyname = strkeyname.tostring().trim(new char[] { ' ', '\0' });
}
else
{
barcode.keyname = "";
}
byte[] kbarray = new byte[256];
uint ukey = 0;
getkeyboardstate(kbarray);
if (toascii(barcode.virtkey, barcode.scancode, kbarray, ref ukey, 0))
{
barcode.ascii = ukey;
barcode.chr = convert.tochar(ukey);
}
if (datetime.now.subtract(barcode.time).totalmilliseconds > 50)
{
strbarcode = barcode.chr.tostring();
}
else
{
if ((msg.message & 0xff) == 13 && strbarcode.length > 3)
//回车
{
barcode.barcode = strbarcode;
barcode.isvalid = true;
}
strbarcode += barcode.chr.tostring();
}
barcode.time = datetime.now;
if (barcodeevent != null) barcodeevent(barcode);
//触发事件
barcode.isvalid = false;
}
}
return callnexthookex(hkeyboardhook, ncode, wparam, lparam);
}
// 安装钩子
public bool start()
{
if (hkeyboardhook == 0)
{
//wh_keyboard_ll = 13
hkeyboardhook = setwindowshookex(13, new hookproc(keyboardhookproc), marshal.gethinstance(assembly.getexecutingassembly().getmodules()[0]), 0);
}
return (hkeyboardhook != 0);
}
// 卸载钩子
public bool stop()
{
if (hkeyboardhook != 0)
{
return unhookwindowshookex(hkeyboardhook);
}
return true;
}
}
}
【注意】要想测试实际的效果，必须执行编译后的exe文件，在开发环境直接运行会没有效果的。
希望本文所述对大家的c#程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
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