C # to write the program, to monitor flicking code gun qr code, and sometimes can do it, and sometimes not,,
A great god to solve it,,, online, etc., quite urgent
Integral only so much,,

Hook type, used to install and uninstall hooks

 
///& lt; Summary> 
///to start listening to 
///& lt;/summary> 
///& lt; Returns>  
Public bool Start () 
{
_qrCode. The Clear (); 
If (_hookProc==null | | _hookHandle==IntPtr. Zero) 
_hookProc=KeyboardHookProc; 
//get a pointer 
IntPtr inpp=Kernel32Library. GetModuleHandle (Process. GetCurrentProcess (). The MainModule. ModuleName); 
//add Hook 
_hookHandle=User32Library. SetWindowsHookEx ((int) HookType WH_KEYBOARD_LL, _hookProc, inpp, 0). 
Running=true; 
return true; 
} 

///& lt; Summary> 
///stop listening 
///& lt;/summary> 
///& lt; Returns>  
Public bool Stop () 
{
Bool unhookSuccess=false; 
If (_hookHandle!=null | | _hookHandle!=IntPtr. Zero) 
{
UnhookSuccess=User32Library. UnhookWindowsHookEx (_hookHandle); 
_hookHandle=IntPtr. Zero; 
Running=false; 
} 
Return unhookSuccess; 
} 

///& lt; Summary> 
///hook callback function 
///& lt;/summary> 
///& lt; Param name="nCode & gt;"  
///& lt; Param name="wParam & gt;"  
///& lt; Param name="lParam & gt;"  
///& lt; Returns>  
Private int KeyboardHookProc (int nCode, IntPtr wParam, IntPtr lParam) 
{
If (nCode==0) 
{
KeyboardMessage MSG=(KeyboardMessage) Marshal. PtrToStructure (lParam, typeof (KeyboardMessage)); 
_qrCode. Add (MSG); 
LogUtility. Info (" Msg analytical value: "+ Msg. VkCode +" qr code scanning code Result: "+ _qrCode. Result); 
//vkCode=13 said enter 
If (MSG) vkCode==13 & amp; & MSG. ParamH==0 & amp; & ! String. IsNullOrEmpty (_qrCode. Result)) 
{
QRCodeProcess (_qrCode. Result); 
} 
} 
Return User32Library. CallNextHookEx (IntPtr. Zero, nCode wParam, lParam); 
} 

Parsing the keyboard

 
///& lt; Summary> 
///add the keyboard information 
///& lt;/summary> 
///& lt; Param name="MSG" & gt;  
Public void the Add (KeyboardMessage MSG) 
{
# region record key information 
//for the first time, press the button 
If (_keys. Count==0) 
{
_keys=new List (a); 
_keys. Add (MSG); 
_result=string. The Empty; 
} 
//not release other button press the button 
Else if (_keydown. Count & gt; 0) 
{

_keys. Add (MSG); 
} 
//unit time to press the button 
Else if (((TimeSpan) (DateTime. Now - _last)). TotalMilliseconds & lt; The Interval) 
{
_keys. Add (MSG); 
} 
//the new record input 
The else 
{
_keys=new List (a); 
_keys. Add (MSG); 
_result=string. The Empty; 
} 
# endregion 

_last=DateTime. Now; 

# region for keyboard status 
//record is press the button 
If (MSG. ParamH==0 & amp; & ! _keydown. The Contains (MSG. VkCode)) 
{
_keydown. Add (MSG. VkCode); 
} 
//remove has loosened buttons 
If (MSG) paramH & gt; 0 & amp; & _keydown. The Contains (MSG. VkCode)) 
{
_keydown. Remove (MSG. VkCode); 
} 
# endregion 

# region to calculate the key information 
Int v=MSG. VkCode & amp; 0 XFF. 
Int c=MSG. ParamL & amp; 0 XFF. 
The StringBuilder strKeyName=new StringBuilder (500); 
If (User32Library. GetKeyNameText (c * 65536, strKeyName, 255) & gt; 0) 
{
_currentKey=strKeyName. ToString (). The Trim (new char [] {', '\ 0'}); 
User32Library. GetKeyboardState (_state); 
If (_currentKey. Length==1 & amp; & MSG. ParamH==0) 
{
//according to the state of the keyboard and the shift to cache the output characters 
_cur=ShiftChar (_currentKey, isShift, _state). The ToString (); 
_result +=_cur; 
} 
} 
# endregion 
} 

///& lt; Summary> 
///
///& lt;/summary> 
///& lt; Param name="k" & gt;  
///& lt; Param name="isShiftDown & gt;"  
///& lt; Param name="state" & gt;  
///& lt; Returns>  
Private char ShiftChar (string k, bool isShiftDown, byte [] state) 
{
Bool capslock=state [0 x14]==1; 
Bool numlock=state x90 [0]==1; 
Bool scrolllock=state x91 [0]==1; 
Bool shiftdown=state xa0 [0]==1; 
Char CRH=(capslock? K.T oUpper () : k.T oLower ()). ToCharArray () [0]. 
If (isShiftDown) 
{
If (CRH & gt;='a' & amp; & CRH & lt;='z') 
{
CRH=(char) ((int) CRH - 32); 
} 
Else if (CRH & gt;='A' & amp; & CRH & lt;='Z') 
{
If (CRH=='Z') 
{
String s=""; 
} 
CRH=(char) ((int) CRH + 32); 
} 
The else 
{
String s="` 1234567890 -=[]; ',./"; 
The string u="~! @ # $% ^ & amp; * () _ + {} : \ "& lt;> ?" ; 
If (s.I ndexOf (CRH) & gt;=0) 
{
Return (u.T oCharArray ()) [s.I ndexOf (CRH)]; 
} 
} 
} 
Return CRH. 
} 

CodePudding user response:

For help,, online, etc

CodePudding user response:

For help,, online, etc

CodePudding user response:

Somebody else equipment "normal" operating keyboard, what are you doing with a hook?

It is ok to properly deal with the keyboard event programming,