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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: RT%{M1tkS  
  e v7A;;  
  一、实现方法 8SiWAOQAL  
5M>SrZH  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: EN>a^B+!  
4dz Ym+vJm  
#pragma data_seg("shareddata") (:+Wc^0  
HHOOK hHook =NULL; //钩子句柄 m*e8j[w#  
UINT nHookCount =0; //挂接的程序数目 M.$=tuUL  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 925T#%y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5}]gL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `]&'yt  
static int KeyCount =0; "|WKK}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 d.>O`.Mu)}  
#pragma data_seg() )C$Ij9<A  
Py9:(fdS  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ]'#^ ~.  
2C_I3S ~U  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: d| {<SRAI  
}6__E;h#J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6il+hz2&lH  
cKey,UCHAR cMask) #LYx;[D6  
{ )Ps<u-V  
 BOOL bAdded=FALSE; g1UQ6Oa  
 for(int index=0;index<MAX_KEY;index++){ #b&=CsW`  
  if(hCallWnd[index]==0){ aXbj pb+  
   hCallWnd[index]=hWnd; hg^k lQD  
   HotKey[index]=cKey; NUi&x+  
   HotKeyMask[index]=cMask; .p~.S&)  
   bAdded=TRUE; 7pH[_]1"  
   KeyCount++; A~a7/N6s;  
   break; VM3)L>x]/  
  } *:chN' <  
 } >u `Ci>tY  
 return bAdded; Nc(A5*  
} nzB!0U  
//删除热键 ]#rmk!VT?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZI!;~q  
{ MLmk=&d  
 BOOL bRemoved=FALSE; Y=UN`vRR  
 for(int index=0;index<MAX_KEY;index++){ h9%.tGx  
  if(hCallWnd[index]==hWnd){ 1(VskFtZF  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /5XdZu6k`h  
    hCallWnd[index]=NULL; 0NSCeq%;6q  
    HotKey[index]=0; rsK b9G  
    HotKeyMask[index]=0; U<yKC8  
    bRemoved=TRUE; w 3L+7V,!  
    KeyCount--; $yZP"AsAR  
    break; 51>OwEf<R  
   } ,v*\2oG3^  
  } m`,h nDp  
 } BQ~\p\  
 return bRemoved; gqAN-b'  
} S.fb[gI]  
i+Xb3+R  
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  DLL中的钩子函数如下: |P"kJ45  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VB+y9$Y'  
{ 1i|5ii*vc  
 BOOL bProcessed=FALSE; U&gl$/4U@  
 if(HC_ACTION==nCode) B{Lzgw u;  
 { ZN`I4Ak  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <*4r6UFR  
   switch(wParam) h`:gMhn  
   {  }4*~*NoQ  
    case VK_MENU: ,xC@@>f  
     MaskBits&=~ALTBIT; =NL(L  
     break; wIQt f|ZI>  
    case VK_CONTROL: M0MvOO*ad  
     MaskBits&=~CTRLBIT; DB+.<  
     break; Y#Pg*C8>8  
    case VK_SHIFT: W'C~{}c=  
     MaskBits&=~SHIFTBIT; ?CuwA-j  
     break; ~,84E [VV  
    default: //judge the key and send message ){i 9,u")  
     break;  u+]8Sq  
   } &m@DK>  
   for(int index=0;index<MAX_KEY;index++){ v}"DW?  
    if(hCallWnd[index]==NULL) DIc -"5~  
     continue; `c_Wk] i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {X&H  
    { ,-Yl%R.W=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Qnv)\M1  
     bProcessed=TRUE; nA#dXckoc  
    } zAd%dbU|  
   } )>^!X$`3  
  } sMWNzt  
  else if((lParam&0xc000ffff)==1){ //有键按下 y)+l U  
   switch(wParam) -IG@v0_w  
   { i}LVBx"K(  
    case VK_MENU: $%3%&+z$I  
     MaskBits|=ALTBIT; ,y*|f0&"~  
     break; $[*<e~?  
    case VK_CONTROL: >o!~T}J7  
     MaskBits|=CTRLBIT; J?bx<$C@  
     break; CF@j]I@{   
    case VK_SHIFT: s\ YHT.O?  
     MaskBits|=SHIFTBIT; hdH}4W  
     break; |VML.u:N  
    default: //judge the key and send message n]P,5  
     break; b(:U]>J  
   } WQYw@M~4Q!  
   for(int index=0;index<MAX_KEY;index++){ e[L%M:e9U  
    if(hCallWnd[index]==NULL) #uH%J<U  
     continue; (wZ/I(4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S8)6@ECC  
    { Jm*wlN [>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); yK:b $S  
     bProcessed=TRUE; b*"%E, ?  
    } +T]D\];D  
   } &qae+p?  
  } [#C(^J*@c  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 m3 W  
   for(int index=0;index<MAX_KEY;index++){ 5'[b:YC  
    if(hCallWnd[index]==NULL) #qdfr3  
     continue; /gq VXDY+`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c\(CbC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); &X OFc.u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 j.7BoV  
   } VPXUy=W  
  } X< p KAO\  
 } !"QvV6Lq\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Xg1QF^  
} o",J{  
_ "H&  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y^hCO:`l3  
p`06%"#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lk1e{! a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1gDsL  
AqucP@  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: [$%O-_x  
 F'9#dR?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L~>~a1p!  
{ 'o]8UD(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zP|^) h5  
 { 8(""ui 8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 pt=H?{06  
  SaveBmp(); ]}0QrD  
  return FALSE; &Z 6s\r%  
 } tkKiuh?m  
 …… //其它处理及默认处理 xy[aZr  
} K+ @R [  
Q6rvTV'vv  
p5\B0G<m  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 @pO2A6 Ks  
4|Ay;}X \  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 #8qhl  
U/9_:  
  二、编程步骤 ?I332,,q  
nv/'C=+L  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; $ucA.9pJ  
M A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; E]dmXH8A  
oA]rwa UX  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; aV`_@F-8  
rki0!P`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; }*s`R;B|,  
 w0`8el;  
  5、 添加代码,编译运行程序。 CWw#0  
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三、程序代码 %+HZ4M+hV  
db`L0JB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XsbYWJdds  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =a^}]k}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :B  9>  
#if _MSC_VER > 1000 ZfP$6%;_  
#pragma once G_/Dz JBF  
#endif // _MSC_VER > 1000 z^^)n  
#ifndef __AFXWIN_H__ qPF`=#  
#error include 'stdafx.h' before including this file for PCH cogIkB&Ju  
#endif ,u_ Z0S M  
#include "resource.h" // main symbols :kQydCuK  
class CHookApp : public CWinApp Bvsxn5z+:  
{ < wi9   
 public: m6Mko2  
  CHookApp(); t4v@d  
  // Overrides @jY=b<  
  // ClassWizard generated virtual function overrides h'ik19  
  //{{AFX_VIRTUAL(CHookApp) v8f1o$R  
 public: 2xK v;  
  virtual BOOL InitInstance(); V;29ieE!  
  virtual int ExitInstance(); 3>QkO.b  
  //}}AFX_VIRTUAL w?:tce   
  //{{AFX_MSG(CHookApp) @A'@%Zv-  
  // NOTE - the ClassWizard will add and remove member functions here. 'M!M$<j  
  // DO NOT EDIT what you see in these blocks of generated code ! Lz{z~xNHW.  
  //}}AFX_MSG !QS j*)V#  
  DECLARE_MESSAGE_MAP() ^xm%~   
}; Mqv[7.|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cp$GP*{@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "Tz'j}< 9C  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fj4>)!^kM  
BOOL InitHotkey(); :T )R;E@  
BOOL UnInit(); WT63ve  
#endif ?"$Rw32  
V@rqC[on  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^:~!@$*;6  
#include "stdafx.h" A~}5T%qb  
#include "hook.h" ]p!)8[<  
#include <windowsx.h> `3:Q.A_?  
#ifdef _DEBUG a'Yi^;2+\  
#define new DEBUG_NEW sm"s2Ci=}  
#undef THIS_FILE ,0a\Ka {^  
static char THIS_FILE[] = __FILE__; ( 4(,"  
#endif 7!Qu+R  
#define MAX_KEY 100 Z0%:j\W4c  
#define CTRLBIT 0x04 4i7+'F  
#define ALTBIT 0x02 qWM+!f  
#define SHIFTBIT 0x01 5Mz:$5Tm  
#pragma data_seg("shareddata") 1]69S(  
HHOOK hHook =NULL; Kf1NMin7  
UINT nHookCount =0; -nXlW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }Xvm( ;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %+^Qs\j  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `vZX"+BAh  
static int KeyCount =0; Y'C1L4d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =M=v; ,I-  
#pragma data_seg() lhC hk7l  
HINSTANCE hins; -}_1f[b  
void VerifyWindow(); $C{,`{=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _ee<i8_Va  
//{{AFX_MSG_MAP(CHookApp) y*%uGG5  
// NOTE - the ClassWizard will add and remove mapping macros here. Wh)!Ha}  
// DO NOT EDIT what you see in these blocks of generated code! f@[qS7ok  
//}}AFX_MSG_MAP R$X~d8o>%  
END_MESSAGE_MAP() O,JS*jXl  
GZ^Qt*5 {  
CHookApp::CHookApp() YPW UncV  
{ XY#.?<"Q8  
 // TODO: add construction code here, X|-[i hp;  
 // Place all significant initialization in InitInstance RqX^$C8M  
} F3hG8YX  
yd=b!\}WJ  
CHookApp theApp; *3)kr=x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +PS jBO4!  
{ _b$ yohQ  
 BOOL bProcessed=FALSE; -9::M}^2  
 if(HC_ACTION==nCode) k.z(.uc=  
 { m*jTvn  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ol~M BQs  
   switch(wParam) XO+rg&Pu  
   { "9 f+F  
    case VK_MENU: "([/G?QAG  
     MaskBits&=~ALTBIT; U*b7 Pxq;  
     break; zz /4 ()u  
    case VK_CONTROL: 3)yL#hXg)  
     MaskBits&=~CTRLBIT; vA}_x7}n(  
     break; 4jt(tZS  
    case VK_SHIFT: mRa\ wEg%  
     MaskBits&=~SHIFTBIT; oKb"Ky@s  
     break; T+^c=[W  
    default: //judge the key and send message -We9 FO~  
     break; 0(*L)s,5  
   } f7y.##WG  
   for(int index=0;index<MAX_KEY;index++){ j+@3.^vK  
    if(hCallWnd[index]==NULL) `BVmuUMm  
     continue; ]f0OmUHR5i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1 +[sM  
    { !I.}[9N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Vd(n2JMtG  
     bProcessed=TRUE; \ 'Va(}v  
    } { :1X N  
   } 'ZB^=T  
  } n}I?.r@e  
  else if((lParam&0xc000ffff)==1){ //Key down \5 rJ  
   switch(wParam) M~N/er  
   { 5VJe6i9;  
    case VK_MENU: =J4|"z:  
     MaskBits|=ALTBIT; Ulx]4;uzf  
     break; fbU3-L?  
    case VK_CONTROL: > K?OsvX  
     MaskBits|=CTRLBIT; k%FA:ms|k  
     break; GX0zirz  
    case VK_SHIFT: UKQ"sC  
     MaskBits|=SHIFTBIT; 4(8tr D6  
     break; r0 )ne|&Hp  
    default: //judge the key and send message 1Dl6T\20  
     break; f:-l}Zj  
   } Zskj?+1  
   for(int index=0;index<MAX_KEY;index++) _bi)d201  
   { )Qd x  
    if(hCallWnd[index]==NULL) ddyX+.LMk  
     continue; HC/z3b;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e"52'zAV-  
    { ;}j(x;l>t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w7o`B R  
     bProcessed=TRUE; 2 U]d 1  
    } P6R_W  
   } RFy MRE!?  
  } #,u|*O:  
  if(!bProcessed){ yji[Yde;|  
   for(int index=0;index<MAX_KEY;index++){ BqY_N8l&E  
    if(hCallWnd[index]==NULL) V*{rHp{=p  
     continue; s<)lC;#e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5OppK(Oi*C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZGDT 6,  
   } bD{k=jum  
  } tw>2<zmSi%  
 } zD79M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p*&0d@'r  
} ?UZt30|1  
Z sTtSM\Ac  
BOOL InitHotkey() dw3Hk$"h  
{ z8'1R6nq  
 if(hHook!=NULL){ BUJ\[/  
  nHookCount++; `}$o<CJ  
  return TRUE; %KXiB6<4  
 } {VL@U$'oI  
 else =I'3C']Z W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); o[T+/Ej&  
  if(hHook!=NULL) !6T"J!F#  
   nHookCount++; R2gV(L(!!  
  return (hHook!=NULL); PmRvjSIG  
} J+J,W5t^  
BOOL UnInit() yGf7k>K'  
{ ]m b8R:a1  
 if(nHookCount>1){ 7l=;I%  
  nHookCount--; [/UchU]DT  
  return TRUE; w{6C4~0  
 } Wc[,kc  
 BOOL unhooked = UnhookWindowsHookEx(hHook); AQg|lKv  
 if(unhooked==TRUE){ akxNT_   
  nHookCount=0; Y8\P"q b  
  hHook=NULL; AO$AT_s  
 } 2t-w0~O  
 return unhooked; hlaN'j <C  
} /.Ak'Vmi  
%,kP_[!>Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  :^.wjUI  
{ rNii,_  
 BOOL bAdded=FALSE; FM >ae-L-  
 for(int index=0;index<MAX_KEY;index++){ `t&{^ a&Y"  
  if(hCallWnd[index]==0){ |)29"_Kk5  
   hCallWnd[index]=hWnd; jC9us>b  
   HotKey[index]=cKey; yZ|"qP1  
   HotKeyMask[index]=cMask; .h7s.p?  
   bAdded=TRUE; g[3LPKQ  
   KeyCount++; ]R#:Bq!F  
   break; DAB9-[y+  
  } [|DKBJ  
 } 8AuBs;i  
 return bAdded; ] 3"t]U'f  
} c+9L6}D  
2 }r=DAe0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <EpL<K%  
{ rp||#v0l!w  
 BOOL bRemoved=FALSE; f'^uuO#x  
 for(int index=0;index<MAX_KEY;index++){ d,b4q&^X8  
  if(hCallWnd[index]==hWnd){ 5^u$zfR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  ?pTX4a&>  
    hCallWnd[index]=NULL; D(#f`Fj;  
    HotKey[index]=0; $zM shLT  
    HotKeyMask[index]=0; mll :rWC)  
    bRemoved=TRUE; _h~ksNm5u  
    KeyCount--; 0 =j }`  
    break; lW&(dn)}  
   } ~2w&+@dV%  
  } <W80AJ  
 } pk/#RUfT+  
 return bRemoved; H\67Pd(Z6  
} Az`Aa0h]7  
<(L@@.87R  
void VerifyWindow() Y%s:oHt  
{ 1iy$n  
 for(int i=0;i<MAX_KEY;i++){ F4EAC|Y  
  if(hCallWnd!=NULL){ I,j4 BU4  
   if(!IsWindow(hCallWnd)){ Tlsh[@Q  
    hCallWnd=NULL;  `Y#At3{  
    HotKey=0; 5Q?Jm~H9  
    HotKeyMask=0; $KiCs]I+  
    KeyCount--; Oj5UG*  
   } &O&HczO  
  } k$w~JO!s  
 } EKwQ$?I  
} \G" S7  
M&Ka ^h;N  
BOOL CHookApp::InitInstance() LVj 1NP  
{ 2$JGhgDI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4Gc M  
 hins=AfxGetInstanceHandle(); !eLj + 0  
 InitHotkey(); ti\ ${C3  
 return CWinApp::InitInstance(); 1 em,/> "  
} za>UE,?h  
t]yxLl\  
int CHookApp::ExitInstance() OXEk{#Uf[3  
{ m&UP@hUV-  
 VerifyWindow(); zM9#1^X  
 UnInit(); =)[m[@,c  
 return CWinApp::ExitInstance(); =q4}(  
} rFRcK>X\L  
Kc MzY  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9u B?-.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (#Y~z',I  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Da=EAG-{7  
#if _MSC_VER > 1000 Mt[yY|Ec|  
#pragma once QU"WpkO  
#endif // _MSC_VER > 1000 -+#%]P8l  
f%Q{}fC{*  
class CCaptureDlg : public CDialog aF{_"X2  
{ 9wgB J Jl7  
 // Construction <n2@;` D  
 public: 8+zW:0"[  
  BOOL bTray; 3db{Tcn\@]  
  BOOL bRegistered; w?Te%/s.  
  BOOL RegisterHotkey(); V]=22Cxi'~  
  UCHAR cKey; LW %AZkAx  
  UCHAR cMask; #2{-6ey  
  void DeleteIcon();  +\/Q  
  void AddIcon(); |VBt:dd<  
  UINT nCount; Yh":>~k?SY  
  void SaveBmp(); {ZJO5*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m|a9T#B(  
  // Dialog Data :RaQ =C  
  //{{AFX_DATA(CCaptureDlg) g9_zkGc7  
  enum { IDD = IDD_CAPTURE_DIALOG }; _Cmmx`ln  
  CComboBox m_Key; a~$XD(w^  
  BOOL m_bControl; yk+ 50/L  
  BOOL m_bAlt; 88g3<&  
  BOOL m_bShift; i]JTKL{\q  
  CString m_Path; 8:ubtB  
  CString m_Number; Kb.qv)6i*  
  //}}AFX_DATA D!<F^mtl  
  // ClassWizard generated virtual function overrides wu41Mz7  
  //{{AFX_VIRTUAL(CCaptureDlg) vwCQvt  
 public: L.Y3/H_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8Sbz)X  
 protected: [);oj<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DiCz%'N  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H?$dnwR  
  //}}AFX_VIRTUAL xEb>6+-F@  
  // Implementation #8$?# dT  
 protected: Y"Cf84E  
  HICON m_hIcon; @= -(H<0  
  // Generated message map functions P"YdB|I  
  //{{AFX_MSG(CCaptureDlg) YW}$eW*  
  virtual BOOL OnInitDialog(); x.SfB[SZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i'>6Qo  
  afx_msg void OnPaint(); zp:dArh0  
  afx_msg HCURSOR OnQueryDragIcon(); =Tj{)=^/#  
  virtual void OnCancel(); &,X}M  
  afx_msg void OnAbout(); mG~_*8}e<  
  afx_msg void OnBrowse(); ("$/sT  
  afx_msg void OnChange(); `MtzA^Xr  
 //}}AFX_MSG 8fC4j`!  
 DECLARE_MESSAGE_MAP() OgQd yU  
}; /<LZt<K  
#endif nL@'??I1  
XJ18(Q|w'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K$"#SZEi  
#include "stdafx.h" Ayz*2 N`%  
#include "Capture.h" > I2rj2M#  
#include "CaptureDlg.h" S|85g1}t  
#include <windowsx.h> *t@A-Sn  
#pragma comment(lib,"hook.lib") T(J'p4  
#ifdef _DEBUG LGP"S5V  
#define new DEBUG_NEW !Sc"V.o @!  
#undef THIS_FILE CSM"Kz`  
static char THIS_FILE[] = __FILE__; AIF ?>wgq  
#endif { 3G  
#define IDM_SHELL WM_USER+1 v 6~9)\!j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 222 Y?3>@D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); : 4ryi&Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }:Z.g  
class CAboutDlg : public CDialog M'*s5:i  
{ *ap,r&]#F  
 public: (q)}`1d'  
  CAboutDlg(); 7]=&Q4e4  
  // Dialog Data #'L<7t K  
  //{{AFX_DATA(CAboutDlg) i8iT}^  
  enum { IDD = IDD_ABOUTBOX }; x|H`%Z  
  //}}AFX_DATA z@*E=B1L  
  // ClassWizard generated virtual function overrides Kv_2=]H  
  //{{AFX_VIRTUAL(CAboutDlg) `Os=cMR  
 protected: bI):-2&s}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qmS9*me {  
  //}}AFX_VIRTUAL i:lc]B  
  // Implementation 0PzSp ]  
 protected: qu=~\t1[6  
  //{{AFX_MSG(CAboutDlg) Jo?LPR \6  
  //}}AFX_MSG VB |?S|<  
  DECLARE_MESSAGE_MAP() %hB-$nE  
}; %~rEJB@{  
3CCs_AO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ah>c)1DA*H  
{ B#K gU&Loo  
 //{{AFX_DATA_INIT(CAboutDlg) -y`Pm8  
 //}}AFX_DATA_INIT ;6tra_  
} _l d.Xmvd  
?]Yic]$n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ot0teNF  
{ hkK>h  
 CDialog::DoDataExchange(pDX); ddn IKkOp  
 //{{AFX_DATA_MAP(CAboutDlg) u I e^Me  
 //}}AFX_DATA_MAP 7?.uAiM'zT  
} ak(s@@k  
-(vHy/Hz.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )nUdU = m  
 //{{AFX_MSG_MAP(CAboutDlg) _c5@)I~  
 // No message handlers L&\W+k  
 //}}AFX_MSG_MAP ym;]3<I?I[  
END_MESSAGE_MAP() l*CulVX  
g2OnLEF]s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vYgJu-Sl  
: CDialog(CCaptureDlg::IDD, pParent) E-A9lJWr  
{ Gp9 <LB\,  
 //{{AFX_DATA_INIT(CCaptureDlg) NdK`-RT  
  m_bControl = FALSE; (,At5 T  
  m_bAlt = FALSE; w,%"+ tY_  
  m_bShift = FALSE; fu7x,b0p  
  m_Path = _T("c:\\"); 35h|?eN_m!  
  m_Number = _T("0 picture captured."); `?VK(<w0q  
  nCount=0; Gb')a/  
  bRegistered=FALSE; 9z,sn#-t  
  bTray=FALSE; O4rjGTRF  
 //}}AFX_DATA_INIT &4Z8df!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >d 5-if  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); {`HbpM<=m]  
} -rDfDdT  
g=:o'W$@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SSe;&Jk2d  
{ :ez76oGyc  
 CDialog::DoDataExchange(pDX); q <}IO  
 //{{AFX_DATA_MAP(CCaptureDlg) h#1:ypA6l  
  DDX_Control(pDX, IDC_KEY, m_Key); [^"}jbn/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =?]`Xo,v~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,Yag! i>;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); RDps{),E;d  
  DDX_Text(pDX, IDC_PATH, m_Path); k>i88^kPV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Fe8X@63  
 //}}AFX_DATA_MAP 3M#x)cW  
} "&_+!TBg,  
M$x,B#b  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xQR/Xp!h  
//{{AFX_MSG_MAP(CCaptureDlg) ; _%zf5;'  
 ON_WM_SYSCOMMAND() #JUh"8N'  
 ON_WM_PAINT() aB%.]bi  
 ON_WM_QUERYDRAGICON() T{prCM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) | BaEv\$K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yY]x' 'K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &dB@n15'A  
//}}AFX_MSG_MAP xM())Z|2  
END_MESSAGE_MAP() "rdpA[>L  
f]*;O+8$LN  
BOOL CCaptureDlg::OnInitDialog() enk`I$Xx  
{ :6n4i$  
 CDialog::OnInitDialog(); 3MQHoxX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); WUS%4LL(  
 ASSERT(IDM_ABOUTBOX < 0xF000); _'p/8K5)=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =CzGI|pb  
 if (pSysMenu != NULL) :k9T`Aa]  
 { <?41-p-;  
  CString strAboutMenu; +G;<D@gSa0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); m%9Yo%l~  
  if (!strAboutMenu.IsEmpty()) J;sQvPHV8  
  { 7-3  
   pSysMenu->AppendMenu(MF_SEPARATOR); NSVE3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); " ILF!z  
  } Y`g O:d8  
 } Q8m~L1//S  
 SetIcon(m_hIcon, TRUE); // Set big icon % jDH{xSMb  
 SetIcon(m_hIcon, FALSE); // Set small icon >{AE@@PB^  
 m_Key.SetCurSel(0); c@A.jc  
 RegisterHotkey(); nw+t!C  
 CMenu* pMenu=GetSystemMenu(FALSE); RIkIE=+6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'c~SE>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vhMoCLb  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nscnG5'{+  
 return TRUE; // return TRUE unless you set the focus to a control 5,xPB5pK  
} ( yLu=  
dr)*.<_+a(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %=z>kU1|  
{ auI`'O`/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s<*+=aIfu  
 { e;v7!X  
  CAboutDlg dlgAbout; dPO"8HQ  
  dlgAbout.DoModal(); CLND[gc  
 } 0}GO$%l  
 else M|nLD+d~8  
 { E2|M#Y  
  CDialog::OnSysCommand(nID, lParam); Av.`'.b  
 } 1PVZGZxAgv  
} 'qVlq5.  
ts=D  
void CCaptureDlg::OnPaint() } :?*n:g5  
{ DXJw)%G w  
 if (IsIconic()) y/@Bhzc  
 { U_jW5mgsG  
  CPaintDC dc(this); // device context for painting Mn5(Kw?o2J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yR5XcPoKI  
  // Center icon in client rectangle } ew{WD  
  int cxIcon = GetSystemMetrics(SM_CXICON); $c*fbBM(&n  
  int cyIcon = GetSystemMetrics(SM_CYICON); .joCZKO  
  CRect rect; ;nlJ D#  
  GetClientRect(&rect); p$F` 9_bZ  
  int x = (rect.Width() - cxIcon + 1) / 2; :@p]~{m:G  
  int y = (rect.Height() - cyIcon + 1) / 2; A}! A*z<9  
  // Draw the icon w#2apaz  
  dc.DrawIcon(x, y, m_hIcon); >'n[B    
 } WiZkIZ  
 else |Ja5O  
 { qo:Zc`t(R  
  CDialog::OnPaint(); {^ BZ#)m|  
 } zEjl@Kf  
} */~|IbZ`o  
Dh m ;K$T  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4~Q<LEly  
{ NXLb'mH~  
 return (HCURSOR) m_hIcon; E9Kp=3H  
} eG+$~\%Fub  
g3s5ra[  
void CCaptureDlg::OnCancel() ?i_2ueVR  
{ Vuy%7H  
 if(bTray) t(<k4ji,  
  DeleteIcon(); TlO=dLR7d  
  CDialog::OnCancel(); LQqba4$  
}  irh Z  
2K3j3|T  
void CCaptureDlg::OnAbout() l_2Xao$  
{ &n]v  
 CAboutDlg dlg; 3]iw3M  
 dlg.DoModal(); f7zB_hVDmE  
} V(XU^}b#  
Mmgm6{  
void CCaptureDlg::OnBrowse() C-_u`|jQ  
{ r:rPzq1  
 CString str; 5~>j98K  
 BROWSEINFO bi; ~Y0K Wx4  
 char name[MAX_PATH]; ;"f9"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -~sW@u)O  
 bi.hwndOwner=GetSafeHwnd(); f*V^HfiQb  
 bi.pszDisplayName=name; p%Q{Rqc)  
 bi.lpszTitle="Select folder"; e`B!)Sr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x`2dN/wDhf  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5T"h7^}e  
 if(idl==NULL) -5os0G80  
  return; Ur[ai6LNG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); c.Izm+9k  
 str.ReleaseBuffer(); {OQ)Np!  
 m_Path=str; uR=*q a  
 if(str.GetAt(str.GetLength()-1)!='\\') AN,3[Sh  
  m_Path+="\\"; s!W{ru  
 UpdateData(FALSE); {y|.y~vW  
} f% 8n?f3;u  
Dd OK&  
void CCaptureDlg::SaveBmp() J;V#a=I  
{ \{(cz/]G/  
 CDC dc; ^tyqc8&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); H[R6 ?H@$F  
 CBitmap bm; dtQ3iuV %  
 int Width=GetSystemMetrics(SM_CXSCREEN); 'e>'J ZR  
 int Height=GetSystemMetrics(SM_CYSCREEN); PMiu "  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?mi}S${g  
 CDC tdc; `&)  
 tdc.CreateCompatibleDC(&dc); 7lOAu]Zx  
 CBitmap*pOld=tdc.SelectObject(&bm); Q=<&ew  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); u3cg&lEgT  
 tdc.SelectObject(pOld); >7?Lq<H  
 BITMAP btm; 0/fwAp  
 bm.GetBitmap(&btm); F&k<P>k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; e Z L!Z!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ug[0l)  
 BITMAPINFOHEADER bih; [ P*L`F  
 bih.biBitCount=btm.bmBitsPixel; 1JS5 LS  
 bih.biClrImportant=0; ?<OE|nb&  
 bih.biClrUsed=0; ](+u'8  
 bih.biCompression=0; lBG5~<NT  
 bih.biHeight=btm.bmHeight; E)'T;%  
 bih.biPlanes=1; uw>y*OLU+  
 bih.biSize=sizeof(BITMAPINFOHEADER); mmC MsBfL  
 bih.biSizeImage=size; X#W6;?Z\  
 bih.biWidth=btm.bmWidth; B|>eKI  
 bih.biXPelsPerMeter=0; I]#x0?D  
 bih.biYPelsPerMeter=0; IQ JFL +f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BL0xSNE**  
 static int filecount=0; 3E@ &  
 CString name; H_iQR9Ak7  
 name.Format("pict%04d.bmp",filecount++); us#ji i.<  
 name=m_Path+name; M(} T\R  
 BITMAPFILEHEADER bfh; =m;cy0))  
 bfh.bfReserved1=bfh.bfReserved2=0; HT_nxe`E  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %~<F7qB  
 bfh.bfSize=54+size; mt *Dx  
 bfh.bfOffBits=54; 5M%)*.Y 3[  
 CFile bf; C]zG@O !  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h-03]M#8=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pfMmDl5|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N]I::  
  bf.WriteHuge(lpData,size); Vvn~G.&)  
  bf.Close(); <P5 7s+JK  
  nCount++; I0bkc3  
 } ~:b5UIAk  
 GlobalFreePtr(lpData); CT.hBz -S  
 if(nCount==1) o3'Za'N.  
  m_Number.Format("%d picture captured.",nCount); }dq)d.c  
 else Q2gz\N  
  m_Number.Format("%d pictures captured.",nCount); qz-lQ  
  UpdateData(FALSE); pW<l9W  
} L>`inrpz=w  
q ) e* eN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ) Cm95,Y  
{ {ZUgyGE{  
 if(pMsg -> message == WM_KEYDOWN) 7%|HtBXv^  
 { X-yS9E  
  if(pMsg -> wParam == VK_ESCAPE) $ 3Sm?  
   return TRUE; C9%A?'`  
  if(pMsg -> wParam == VK_RETURN) G Mg|#DV  
   return TRUE; JGlp7wro  
 } . N5$s2t  
 return CDialog::PreTranslateMessage(pMsg); >)F)@KAuN4  
} [WR*u\FF  
V4<f4|IL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "6WE6zq   
{ &7w*=f8I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,u5iiR  
  SaveBmp(); G'iE`4`2  
  return FALSE; tRR<4}4R  
} _]kw |[)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?J5E.7o  
 CMenu pop; RbEtNwG@c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); na|23jz4  
 CMenu*pMenu=pop.GetSubMenu(0); K!tM "`a  
 pMenu->SetDefaultItem(ID_EXITICON); 5BMrn0  
 CPoint pt; DPWnvd  
 GetCursorPos(&pt); kI~; 'M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d?[8VfAnh  
 if(id==ID_EXITICON) \lpvRZ\L&g  
  DeleteIcon(); Pu2cU5n  
 else if(id==ID_EXIT) KhNE_. Z  
  OnCancel(); fp$U%uj  
 return FALSE; 5Noy~;  
} 'DB'lP  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~#:R1~rh\e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) jGn2Q L  
 AddIcon(); )Q~K\bJf  
 return res; E#yG}UWe  
} !h+VbZ  
#PMi6q~Z  
void CCaptureDlg::AddIcon() Gr|102  
{ CuYSvW  
 NOTIFYICONDATA data; 9t{Iv({6p  
 data.cbSize=sizeof(NOTIFYICONDATA); ghaO#kI  
 CString tip; 6M6r&,yRu  
 tip.LoadString(IDS_ICONTIP); \x~},!l  
 data.hIcon=GetIcon(0); )VkH':yCM  
 data.hWnd=GetSafeHwnd(); bx3kd+J7  
 strcpy(data.szTip,tip); $_u)~O4$  
 data.uCallbackMessage=IDM_SHELL; kXZG<?  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }\.Z{h:t ?  
 data.uID=98; ga|-~~  
 Shell_NotifyIcon(NIM_ADD,&data); K]>X31Ho  
 ShowWindow(SW_HIDE); kIH)>euZ  
 bTray=TRUE; kO' NT:  
} k mX:~KMb  
 tZN'OoZ  
void CCaptureDlg::DeleteIcon() Wo/LrCg  
{ 5NhwIu^<  
 NOTIFYICONDATA data; '+\.&'A  
 data.cbSize=sizeof(NOTIFYICONDATA); }N#hg>; B  
 data.hWnd=GetSafeHwnd(); QzD8 jk#  
 data.uID=98; 'zx1kq1  
 Shell_NotifyIcon(NIM_DELETE,&data); `;3fnTI:1  
 ShowWindow(SW_SHOW); ()EiBl(kWk  
 SetForegroundWindow(); 6$\'dkufQ  
 ShowWindow(SW_SHOWNORMAL); :cE~\B S&  
 bTray=FALSE; VuA)Ye  
} f>ilk Q`  
9Z.W R-}  
void CCaptureDlg::OnChange() {GQRJ8m  
{ %g=SkQ&d  
 RegisterHotkey(); F44KbUH  
} hdy N   
~d&W;mef-  
BOOL CCaptureDlg::RegisterHotkey() ]t.6bb4  
{ Aw7_diK^  
 UpdateData(); u*<knZ~ty  
 UCHAR mask=0; J+f*D+x1  
 UCHAR key=0; G>j4b}e  
 if(m_bControl) DBZ^n9  
  mask|=4; P(~vqo>!  
 if(m_bAlt) W4S! rU  
  mask|=2; kPF qsq  
 if(m_bShift) ,I8[tiR"b  
  mask|=1; bLyaJ%pa\/  
  key=Key_Table[m_Key.GetCurSel()]; Wt9'-"c  
 if(bRegistered){ 7G &I]>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @LR:^>&*  
  bRegistered=FALSE; ^ub@ Jwe  
 } N&-J,p~  
 cMask=mask; sB%QqFRP  
 cKey=key; vuNq7V*}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); NekPl/4  
 return bRegistered; |E9iG  
} -gy@sSfvkv  
K_CE.8G&{  
  四、小结 iCh,7I,m  
6@geakq  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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