C#操控 条形码扫描枪
对于这样类似的资料，平时觉得没有什么，但是当你遇到时一时找不到还会有些着急，所以收藏了。。。。
代码
//
条码扫描器
//
窗体部分相关代码：
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
namespace
ReadBadCode
{
public
partial
class
frmTest : Form
{
BarCodeHook BarCode
=
new
BarCodeHook();
public
frmTest()
{
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;
textBox2.Text
=
barCode.VirtKey.ToString();
textBox3.Text
=
barCode.ScanCode.ToString();
textBox4.Text
=
barCode.AscII.ToString();
textBox5.Text
=
barCode.Chr.ToString();
textBox6.Text
=
barCode.IsValid
?
barCode.BarCode :
""
;
}
}
void
BarCode_BarCodeEvent(BarCodeHook.BarCodes barCode)
{
ShowInfo(barCode);
}
private
void
frmTest_Load(
object
sender, EventArgs e)
{
BarCode.Start();
}
private
void
frmTest_FormClosed(
object
sender, FormClosedEventArgs e)
{
BarCode.Stop();
}
private
void
textBox6_TextChanged(
object
sender, EventArgs e)
{
if
(textBox6.Text.Length
>
0
)
{
MessageBox.Show(textBox6.Text);
}
}
}
}
BarCodeHook 类相关代码：
using
System;
using
System.Collections.Generic;
using
System.Text;
using
System.Runtime.InteropServices;
using
System.Reflection;
namespace
ReadBadCode
{
public
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;
}
[DllImport(
"
user32.dll
"
, CharSet
=
CharSet.Auto, CallingConvention
=
CallingConvention.StdCall)]
private
static
extern
int
SetWindowsHookEx(
int
idHook, HookProc lpfn, IntPtr hInstance,
int
threadId);
[DllImport(
"
user32.dll
"
, CharSet
=
CharSet.Auto, CallingConvention
=
CallingConvention.StdCall)]
private
static
extern
bool
UnhookWindowsHookEx(
int
idHook);
[DllImport(
"
user32.dll
"
, CharSet
=
CharSet.Auto, CallingConvention
=
CallingConvention.StdCall)]
private
static
extern
int
CallNextHookEx(
int
idHook,
int
nCode, Int32 wParam, IntPtr lParam);
[DllImport(
"
user32
"
, EntryPoint
=
"
GetKeyNameText
"
)]
private
static
extern
int
GetKeyNameText(
int
lParam, StringBuilder lpBuffer,
int
nSize);
[DllImport(
"
user32
"
, EntryPoint
=
"
GetKeyboardState
"
)]
private
static
extern
int
GetKeyboardState(
byte
[] pbKeyState);
[DllImport(
"
user32
"
, EntryPoint
=
"
ToAscii
"
)]
private
static
extern
bool
ToAscii(
int
VirtualKey,
int
ScanCode,
byte
[] lpKeyState,
ref
uint
lpChar,
int
uFlags);
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
;
}
}
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//
blog.csdn.net/yefanqiu/archive/2009/05/03/4146580.aspx#