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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: p0c*)_a*  
  /2 V  
  一、实现方法 y5>X0tT  
{O24:'K&  
  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: nPlg5&E  
Mn`);[  
#pragma data_seg("shareddata") TVy\%FP^L  
HHOOK hHook =NULL; //钩子句柄 f]c{,LFvZ  
UINT nHookCount =0; //挂接的程序数目 1 Hw%DJ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [2h 4%{R&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Sv&_LZ-"P  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D==C"}J  
static int KeyCount =0; 6ZvGD}/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Sfl. &A(  
#pragma data_seg() be^+X[  
-zn$h$N4  
  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。 *@;Pns]L-  
),DLrGOl  
  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: {tE9m@[AF  
CKB~&>xx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Ql2zC9C  
cKey,UCHAR cMask) [g<rzhC~=  
{ BqoGHg4iq  
 BOOL bAdded=FALSE; }:QQ{h_  
 for(int index=0;index<MAX_KEY;index++){ i n $~(+  
  if(hCallWnd[index]==0){ b!lS=zIN  
   hCallWnd[index]=hWnd; "rHcsuSEw  
   HotKey[index]=cKey; 4i]h0_]  
   HotKeyMask[index]=cMask; =Oyn<  
   bAdded=TRUE; "pRi1Y5)l  
   KeyCount++; !>E$2}Q|]  
   break; tfz"9PV80  
  } mz-sazgV  
 } f2*e&+LjTP  
 return bAdded; Pk2=*{:W  
} Y6+/_$N4|  
//删除热键 QOT|6)Yb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &/+LY_r'<I  
{ h*X5O h6  
 BOOL bRemoved=FALSE; \mp2LICQg  
 for(int index=0;index<MAX_KEY;index++){  }BFX7X  
  if(hCallWnd[index]==hWnd){ 7+'&(^c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $[S)A0O  
    hCallWnd[index]=NULL; gUa-6@  
    HotKey[index]=0; Fy#y.jK9v  
    HotKeyMask[index]=0; !xD$U/%c  
    bRemoved=TRUE; h#:_GNuF  
    KeyCount--; 9-ei#|Vnt[  
    break; AHB_[i'>7  
   } K;L6<a A#  
  } !c2<-3e  
 } x->H~/  
 return bRemoved; $^K12Wcp-  
} `f)X!S2l  
xR~9|H9a  
jNbU{Z%r  
  DLL中的钩子函数如下: ^55q~DP}>  
! (H RP9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vV PK  
{ xI>HY9i )  
 BOOL bProcessed=FALSE; <>shx;g^C  
 if(HC_ACTION==nCode) I+GP`=\  
 { j|-{*t{/x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %(}%#-X  
   switch(wParam) )B$Uo,1  
   {  "=Xky,k  
    case VK_MENU: '.gLqm}%  
     MaskBits&=~ALTBIT; )x& 4 Q=  
     break; xofxE4.  
    case VK_CONTROL: pr w% )#,  
     MaskBits&=~CTRLBIT; HrK7qLw7  
     break; ,DIr&5>p2  
    case VK_SHIFT: [wkSY>Gu  
     MaskBits&=~SHIFTBIT; V*,6_ -^l  
     break; *KYh_i  
    default: //judge the key and send message p3Z[-2I  
     break; K3;~|U-l  
   } #&sw%CD  
   for(int index=0;index<MAX_KEY;index++){ =Sjf-o1V  
    if(hCallWnd[index]==NULL) =WEWs4V5A  
     continue; UA3!28Y&E3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qZ<|A%WQ  
    { a/Ik^:>m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !QsmT3   
     bProcessed=TRUE; =a $7^d  
    } ecdM+kP  
   } iezY+`x4  
  } ?m bI6fYv  
  else if((lParam&0xc000ffff)==1){ //有键按下 nd)`G$gL  
   switch(wParam) jBr3Ay@<  
   { M <K}H8?  
    case VK_MENU: :G4)edwe  
     MaskBits|=ALTBIT; 2{A/Fbk  
     break; l\6.f_  
    case VK_CONTROL: /St d6B*  
     MaskBits|=CTRLBIT; (.~,I+Cz'  
     break; ,<O|#`?"@G  
    case VK_SHIFT: CyKupJ.Fq  
     MaskBits|=SHIFTBIT; z{ (c-7*  
     break; 0RF<:9@x2  
    default: //judge the key and send message fO{'$?K  
     break; zbZN-j#  
   } OrRU$5Lo  
   for(int index=0;index<MAX_KEY;index++){ V8947h|&  
    if(hCallWnd[index]==NULL) ,e@707d`\  
     continue; ;mauA#vd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c :u2a/Q?  
    { 1Q!^%{Y;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [pzo[0G 'v  
     bProcessed=TRUE; \= G8  
    } 8,&pX ga  
   } 1$v1:6  
  } 5e >qBw8t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1#V&'A  
   for(int index=0;index<MAX_KEY;index++){ oV;I8;#\J  
    if(hCallWnd[index]==NULL) f-5}`)`.+  
     continue; yv(\5)XF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H|8i|vbi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GmdS~Fhp  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 js[H $  
   } tD+K4 ^  
  } w9,w?%F  
 } 28,g'k!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V\/5H~L  
} yIf>8ed]#  
J%1 2Ey@6  
  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: i{MzQE+_^  
IJ2>\bW_p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f}:W1&LhI?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W~?mr! `  
K {__rO  
  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: 4>Y\Y$3  
Rf#t|MW*#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;|D8"D6]  
{ :rnj>U6<>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) s}Q*zy  
 { 7NP Ny  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 mApl}I  
  SaveBmp(); ^2eH0O!  
  return FALSE; %R-KkK<S  
 } FQO>%=&4  
 …… //其它处理及默认处理 HyJ&;4rf  
} q/3 )yG6s  
- %`iLu  
Ji;R{tZ.R  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 8+8P{_  
P3+?gW'  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Qe4"a*l-r  
dL|*#e  
  二、编程步骤 N6uKFQL:{  
4L/8Hj#g  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Z:Nm9m  
k(R&`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \Z/# s;c,4  
|YK4V(5x  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; !--A"  
r=:o$e  
  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; g6(u6%MD  
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  5、 添加代码,编译运行程序。 ?gl[ =N V  
1'YksuYx6f  
三、程序代码 l3;MjNB^V  
ky{-NrK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8BggK6X  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) dH+oV`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )jm u*D5N  
#if _MSC_VER > 1000 9p%8VDF=  
#pragma once {"@E_{\  
#endif // _MSC_VER > 1000 +^V%D!.$@  
#ifndef __AFXWIN_H__ I>%@[h,+  
#error include 'stdafx.h' before including this file for PCH { GKqOu  
#endif O`2hTY\  
#include "resource.h" // main symbols +HfZs"x  
class CHookApp : public CWinApp ehr,+GX  
{ 5 $:  q  
 public: 5}he)2*uD  
  CHookApp(); ;eiqzdP  
  // Overrides )NCSO b  
  // ClassWizard generated virtual function overrides [LrA_N  
  //{{AFX_VIRTUAL(CHookApp)  &&sCaNb  
 public: XZ1WY(  
  virtual BOOL InitInstance(); >n6yKcjY]  
  virtual int ExitInstance(); WG(%Pkowv  
  //}}AFX_VIRTUAL .h@HAnmE  
  //{{AFX_MSG(CHookApp) G&v. cF#Y'  
  // NOTE - the ClassWizard will add and remove member functions here. 1`l10fqU  
  // DO NOT EDIT what you see in these blocks of generated code ! QP1 bm]QYA  
  //}}AFX_MSG ~JSa]6:_+  
  DECLARE_MESSAGE_MAP() jLgx(bMn  
}; e2*Fe9:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Bw8&Amxx:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hwB>@r2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M$+2f.(>k)  
BOOL InitHotkey(); Y|y X]\,  
BOOL UnInit(); B4ky%gF4  
#endif 8jm\/?k|  
-8D$[@y(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. =3<@{^Eg  
#include "stdafx.h" iVqa0Gl+}  
#include "hook.h" P4.snRQ  
#include <windowsx.h> oZ"93]3-  
#ifdef _DEBUG K!onV3mR  
#define new DEBUG_NEW O*y@4AR"S  
#undef THIS_FILE xH/Pw?^  
static char THIS_FILE[] = __FILE__; &s<'fSI  
#endif E-XFW]I  
#define MAX_KEY 100 Ialbz\;F2%  
#define CTRLBIT 0x04 UJ1Ecob  
#define ALTBIT 0x02 _.G p}0a  
#define SHIFTBIT 0x01 q+}Er*r  
#pragma data_seg("shareddata") BHEZ<K[U   
HHOOK hHook =NULL; o7WK"E!pF'  
UINT nHookCount =0; b.sRB1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey eK'ztqQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  p@bcf5'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i0e aBG]I  
static int KeyCount =0; _ ZC[h~9H  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift a~"<lzu|$  
#pragma data_seg() _M9-n  
HINSTANCE hins; SVc5mS|up  
void VerifyWindow(); Lyj0$wbH`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ri&?uCCM  
//{{AFX_MSG_MAP(CHookApp) _$YT*o@0J  
// NOTE - the ClassWizard will add and remove mapping macros here. $jtXN E?  
// DO NOT EDIT what you see in these blocks of generated code! [Csv/  
//}}AFX_MSG_MAP %9P)Okq  
END_MESSAGE_MAP() CxW-lU3G`  
ECF \/12  
CHookApp::CHookApp() }ikJ a  
{ SB\T iH/  
 // TODO: add construction code here, SFRQpQ06  
 // Place all significant initialization in InitInstance pu9ub.  
} Bh*7uNM  
y&8kORz;?  
CHookApp theApp; gBCO>nJws  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~76qFZe-  
{ -L)b;0%  
 BOOL bProcessed=FALSE; -)2sR>`A%  
 if(HC_ACTION==nCode) !mLD`62.  
 { =zXii{t  
  if((lParam&0xc0000000)==0xc0000000){// Key up FsyM{LT  
   switch(wParam) /vG)n9Rc  
   { WG?;Z  
    case VK_MENU: soi.`xE  
     MaskBits&=~ALTBIT; r7=r~3)  
     break; j/Rm~!q  
    case VK_CONTROL: ZQQ0}  
     MaskBits&=~CTRLBIT; :w5p#+/,P  
     break; Rr0@F`"R  
    case VK_SHIFT: r:*0)UZlD  
     MaskBits&=~SHIFTBIT; %.3] F2_Q  
     break; IoI ,IX]i)  
    default: //judge the key and send message 98^o9i  
     break; %.+#e  
   } =fZMute  
   for(int index=0;index<MAX_KEY;index++){ (aa}0r5  
    if(hCallWnd[index]==NULL) AyUiX2=w1  
     continue; 3Az7urIY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !1s^TB>N  
    { Rh.CnCbM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5,n{-V  
     bProcessed=TRUE; :Kt'Fm,s?  
    } hB:}0@l6p=  
   } aE'nW@YL.  
  } GDMg.w 4Yk  
  else if((lParam&0xc000ffff)==1){ //Key down %Yi^{ZrM  
   switch(wParam) pg;y\}  
   { 2|C(|fD4  
    case VK_MENU: :- Al}7  
     MaskBits|=ALTBIT; j/<z[qr  
     break; PWw2;3`-6w  
    case VK_CONTROL: a6&+>\o  
     MaskBits|=CTRLBIT; E0Neo _7  
     break; O3>m,v  
    case VK_SHIFT: WFBVAD  
     MaskBits|=SHIFTBIT; "X7;^yY  
     break; Q lg~S1D_v  
    default: //judge the key and send message C0bOPn  
     break; %m5&U6  
   } ca{u"n  
   for(int index=0;index<MAX_KEY;index++) 'eRJQ*0F  
   { 3.^Tm+ C  
    if(hCallWnd[index]==NULL) ' 3MCb  
     continue; B}YpIb]d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m2o)/:  
    { |`50Tf\J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @&G< Np`  
     bProcessed=TRUE; ZC\&n4~7  
    } k-uwK-B}v+  
   } rIg5Wcd  
  } o : t z_5  
  if(!bProcessed){ Xob,jo}a  
   for(int index=0;index<MAX_KEY;index++){ }#h>*+Q  
    if(hCallWnd[index]==NULL) Q5:8$ C}+  
     continue; :J{| /"==  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SpB\kC"K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '8|y^\  
   } s/"?P/R  
  } X>`5YdT~+  
 } ">pt, QV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '"/Yk=EmlU  
} 4tb y N  
q0l=S+0  
BOOL InitHotkey() AM ZWPU  
{ 'l| e}eti>  
 if(hHook!=NULL){ dmkd.aP4  
  nHookCount++; &S8Pnb)d  
  return TRUE; zAxscD f'  
 } g[d.lJ=Q-N  
 else V?*\ISB`}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); .9Y,N&V<H  
  if(hHook!=NULL) M#PutrH  
   nHookCount++; UJWkG^?  
  return (hHook!=NULL); 8.'[>VzBL  
} [z^db0PU  
BOOL UnInit() v,] &[`  
{ AUk,sCxd  
 if(nHookCount>1){ 3i c6!T#t"  
  nHookCount--; =QiVcw,G#  
  return TRUE; mx'!I7b(L/  
 } B)bq@jM  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ba-J-G@YW  
 if(unhooked==TRUE){ P})Iwk|Z  
  nHookCount=0; 8<VO>WA>E  
  hHook=NULL; 7K|: 7e(  
 } F{g^4  
 return unhooked; tL;!!vg#V  
} LXm5f;  
EMV<PshW=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w!=Fi  
{ \VTNXEw*G  
 BOOL bAdded=FALSE; aq|R?  
 for(int index=0;index<MAX_KEY;index++){ 38[ko 3  
  if(hCallWnd[index]==0){ Gw0_M&  
   hCallWnd[index]=hWnd; 2'38(wXn#  
   HotKey[index]=cKey; nlfu y[oX  
   HotKeyMask[index]=cMask; U60jkzIRH  
   bAdded=TRUE; */|Vyp-  
   KeyCount++; 6^oQ8unmS  
   break; kYVn4Wq  
  } soH M5<U  
 } 0(Hhb#WDh\  
 return bAdded; eoC@b/F4  
} #ZPU.NNT?  
\;h+:[<e1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Jx:t(oUR+  
{ 0M'[|ci d|  
 BOOL bRemoved=FALSE; hSO(s  
 for(int index=0;index<MAX_KEY;index++){ 0 tZ>yR  
  if(hCallWnd[index]==hWnd){ \GR M,c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a*pwVn  
    hCallWnd[index]=NULL; .!kO2/:6  
    HotKey[index]=0; } +@H&}u  
    HotKeyMask[index]=0; [`_ZlC  
    bRemoved=TRUE; JMUk=p<\  
    KeyCount--; B4<W%lm  
    break; '>}dqp{Wr  
   } $8{|25 *E  
  } QEavbh^S  
 } @-~ )M_  
 return bRemoved; Q UQ"2oC  
} scff WqEo  
4TBK:Vm5  
void VerifyWindow() {G+pI2^  
{ lYS+EVcR  
 for(int i=0;i<MAX_KEY;i++){ me#?1r  
  if(hCallWnd!=NULL){ $ON4 nx  
   if(!IsWindow(hCallWnd)){ abHW[VP9  
    hCallWnd=NULL; VPKoBJ&  
    HotKey=0; Nvlfi8.  
    HotKeyMask=0; $ylQ \Y'  
    KeyCount--; \G3 P[E[  
   } j=%^CRum  
  } hU}!:6G%[P  
 } n>_EE w2/  
} :N826_q  
6(Qr!<  
BOOL CHookApp::InitInstance() tj:Q]]\M  
{ b)SU8z!NV&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8fn7!  
 hins=AfxGetInstanceHandle(); PjH[8:,  
 InitHotkey(); Xm|Uz`A;  
 return CWinApp::InitInstance(); f1a >C  
} 3H_mR j9th  
N(%%bHi#V  
int CHookApp::ExitInstance() ii.L]#3y  
{ bN ,>,hj  
 VerifyWindow(); aAlES< r  
 UnInit(); LIo3a38n?y  
 return CWinApp::ExitInstance(); C)7T'[  
} +B 4&$z  
$#cZJ@;]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'THcO*<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 92@/8,[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JYY:~2  
#if _MSC_VER > 1000 d$3;o&VUNI  
#pragma once e b])=  
#endif // _MSC_VER > 1000 .H M1c  
,ZpcvK/S  
class CCaptureDlg : public CDialog Zy}Qc")Z  
{ D^?jLfW8  
 // Construction `m~x*)L#  
 public: _^)Wrf+  
  BOOL bTray; *Cdw"n  
  BOOL bRegistered; 6I$laHx?  
  BOOL RegisterHotkey(); LP{{PT.&X  
  UCHAR cKey; aUdbN&G  
  UCHAR cMask; \(nb >K  
  void DeleteIcon(); U{IY F{;@  
  void AddIcon(); %uuh+@/&yz  
  UINT nCount; )JO#Z(  
  void SaveBmp(); KtT.WHr(m  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <Rs#y:  
  // Dialog Data B8jSdlvz  
  //{{AFX_DATA(CCaptureDlg) N=>6PLie  
  enum { IDD = IDD_CAPTURE_DIALOG }; &=1A g}l57  
  CComboBox m_Key; qk;vn}auD]  
  BOOL m_bControl; 4(VVEe  
  BOOL m_bAlt; ho1Mo  
  BOOL m_bShift; vhw"Nl  
  CString m_Path; Z~g I)  
  CString m_Number; di@4'$5#  
  //}}AFX_DATA \m3'4#  
  // ClassWizard generated virtual function overrides rjmKe*_1V  
  //{{AFX_VIRTUAL(CCaptureDlg) n{>Ge,enP0  
 public: D 8nt%vy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @}#"o  
 protected: Q*S|SH-cZ0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ywj=6 +;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CDDx %#eG>  
  //}}AFX_VIRTUAL 7x/S4Gs'4  
  // Implementation E<[_L!2  
 protected: -BY'E$]4  
  HICON m_hIcon; ]s*Fs]1+H  
  // Generated message map functions 7eQE[C  
  //{{AFX_MSG(CCaptureDlg) j\^0BTZ  
  virtual BOOL OnInitDialog(); Oz\mIVC#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R W= <EF&  
  afx_msg void OnPaint(); 6GxQ<  
  afx_msg HCURSOR OnQueryDragIcon(); y$n7'W6  
  virtual void OnCancel(); [m9Pt]j@  
  afx_msg void OnAbout(); ]L'FYOfrpx  
  afx_msg void OnBrowse(); /`M> 3q[  
  afx_msg void OnChange(); hEO#uAR^Z  
 //}}AFX_MSG 4H7 3a5f  
 DECLARE_MESSAGE_MAP() 9;Z2.P"w  
}; dXkgWLI~  
#endif "4VC:"$f  
'bH',X8gF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M*DFtp<  
#include "stdafx.h" x=+R0ny  
#include "Capture.h" a,o>E4#c  
#include "CaptureDlg.h" _xg4;W6M=  
#include <windowsx.h> }pE8G#O&  
#pragma comment(lib,"hook.lib") \htL\m^$9  
#ifdef _DEBUG K !X>k  
#define new DEBUG_NEW s m42  
#undef THIS_FILE *cjH]MQ0Ak  
static char THIS_FILE[] = __FILE__; e ~X<+3<  
#endif 5^Gv!XW  
#define IDM_SHELL WM_USER+1 OH.Re6Rr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bg^k~NX%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z*Y4t?+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IrJPP2Q  
class CAboutDlg : public CDialog pUvbIbg+  
{ Qg)=4(<Hr  
 public: (nhv#&Fd+  
  CAboutDlg(); G1; .\i  
  // Dialog Data S(7_\8 h  
  //{{AFX_DATA(CAboutDlg) b&LfL$  
  enum { IDD = IDD_ABOUTBOX }; I91pX<NBf  
  //}}AFX_DATA ;Nw.  
  // ClassWizard generated virtual function overrides -Jo8jE~>V  
  //{{AFX_VIRTUAL(CAboutDlg) -IBf;"8f  
 protected: 89I[Dg;"u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _$<Q$P6y  
  //}}AFX_VIRTUAL M`W%nvEDE  
  // Implementation (S :+#v  
 protected: (Bta vE  
  //{{AFX_MSG(CAboutDlg) 5lp L$  
  //}}AFX_MSG L*ZC` .h  
  DECLARE_MESSAGE_MAP() {x{/{{wzv  
}; GP"(+5  
7g-#v'.N  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) btq`[gAF\  
{ KFCL|9P  
 //{{AFX_DATA_INIT(CAboutDlg) aBPaC=g{HO  
 //}}AFX_DATA_INIT yOn +Y  
}  `O-LM e  
T[w]w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }$K2h*  
{ % -~W|Y  
 CDialog::DoDataExchange(pDX); \]y4e^FZZ  
 //{{AFX_DATA_MAP(CAboutDlg) uV]4C^k;`[  
 //}}AFX_DATA_MAP ,hj5.;M  
} zVLv-U/=d  
?[4!2T,Ca  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ua.7_Em  
 //{{AFX_MSG_MAP(CAboutDlg) )PC(1Zn  
 // No message handlers 7wt2|$Qz  
 //}}AFX_MSG_MAP `aFy2x`3  
END_MESSAGE_MAP() njk.$]M|nf  
zE{@'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;T0Y= yC  
: CDialog(CCaptureDlg::IDD, pParent) O*3x'I*a  
{ ={9G.%W  
 //{{AFX_DATA_INIT(CCaptureDlg) 7w7mE  
  m_bControl = FALSE; gf!hO$sQ3  
  m_bAlt = FALSE; uN`{; Av  
  m_bShift = FALSE; `{g8A P3  
  m_Path = _T("c:\\"); ^}XKhn.S'  
  m_Number = _T("0 picture captured."); AL.zF\?  
  nCount=0; /o =V (  
  bRegistered=FALSE; Ep% 5wR  
  bTray=FALSE; 0dKI+zgr  
 //}}AFX_DATA_INIT kl.)A-6V  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +):t6oX|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +"Pt?k  
} RU!j"T 5  
G"CV S@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Sd;/yC8  
{ 3F,$} r#  
 CDialog::DoDataExchange(pDX); e&dE>m  
 //{{AFX_DATA_MAP(CCaptureDlg) QN[-XQ>Xt  
  DDX_Control(pDX, IDC_KEY, m_Key); )hH9VGZq(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GyV3]Qqj  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !F0MLvdX7^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); wj>mk  
  DDX_Text(pDX, IDC_PATH, m_Path); a a<9%j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qC9$xIWq  
 //}}AFX_DATA_MAP 6KiI3%y?0  
} Xtqjx@ye  
T ,, Ao36  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) DPvM|n`TW  
//{{AFX_MSG_MAP(CCaptureDlg) !UE' AB  
 ON_WM_SYSCOMMAND() D_GIj$%N[  
 ON_WM_PAINT() gWp\?La  
 ON_WM_QUERYDRAGICON() hWK}] gF  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) u,0N[.&N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2 Mc/ah  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Sf>R7.lpP  
//}}AFX_MSG_MAP bWv4'Y!p  
END_MESSAGE_MAP() -If-c'"G  
DSY:aD!  
BOOL CCaptureDlg::OnInitDialog() U^4 /rbQ  
{ SCl$+9E  
 CDialog::OnInitDialog(); N9r}nqCN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :+ef|,:`/  
 ASSERT(IDM_ABOUTBOX < 0xF000); lkf(t&vL2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ~je#gVoUR  
 if (pSysMenu != NULL) JGPLVw  
 { >=hO jV;  
  CString strAboutMenu; UhCE.# U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -f0Nb+AR  
  if (!strAboutMenu.IsEmpty()) jR@j+p^e  
  { X>mY`$!/  
   pSysMenu->AppendMenu(MF_SEPARATOR); R}F0_.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !RLg[_'  
  } y@[}FgVOh  
 } G l+[ |?N  
 SetIcon(m_hIcon, TRUE); // Set big icon kLVf}J~?  
 SetIcon(m_hIcon, FALSE); // Set small icon _Zya GDv  
 m_Key.SetCurSel(0); uhL+bj+W  
 RegisterHotkey(); H4LZNko  
 CMenu* pMenu=GetSystemMenu(FALSE); JicAz1P1W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hXi^{ntw,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &LE,.Q34  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Zam.g>{]  
 return TRUE; // return TRUE unless you set the focus to a control ^yH!IRRAq  
} PL/as3O^A  
.Gv9RKgd~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) E"5 z T1d  
{ #q1Qa_LXc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) U'S}7gya  
 { ]Q=D'1 MM  
  CAboutDlg dlgAbout; k"|4 LPv[  
  dlgAbout.DoModal(); '3Yci(t+  
 } FjIS:9^)t5  
 else gK/mm\K@  
 { D<$~bUkxR  
  CDialog::OnSysCommand(nID, lParam); *vFVXJo  
 } h+Km|  
} 8DbXv~3@  
T^u][I3*  
void CCaptureDlg::OnPaint() S!qJqZ<Bv  
{ {]plT~{e  
 if (IsIconic()) b:/;  
 { N+x0"~T}I  
  CPaintDC dc(this); // device context for painting AOQimjW9a  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /W'GX n  
  // Center icon in client rectangle U'zW; Lt  
  int cxIcon = GetSystemMetrics(SM_CXICON); i rMZLc6  
  int cyIcon = GetSystemMetrics(SM_CYICON); IbC(/i#%`  
  CRect rect; egboLqn  
  GetClientRect(&rect); @\v,   
  int x = (rect.Width() - cxIcon + 1) / 2; /2-S/,a  
  int y = (rect.Height() - cyIcon + 1) / 2; v!?bEM3D  
  // Draw the icon n'=-bj`  
  dc.DrawIcon(x, y, m_hIcon); (&0%![j&  
 } A_1cM#4  
 else d_=@1 JM>  
 { 8RWfv}:X  
  CDialog::OnPaint(); Gwxx W   
 } ')t :!#  
} %o9@[o .]  
|n=m{JX\m  
HCURSOR CCaptureDlg::OnQueryDragIcon() ![3#([>4>  
{ t9S zZ2E  
 return (HCURSOR) m_hIcon; <y=VDb/  
} `,d*>  
X=_pQ+j`^  
void CCaptureDlg::OnCancel() wEENN_w  
{ gO%#'Eb2  
 if(bTray) ,ii*[{X?  
  DeleteIcon(); C%d\DuJ5'~  
  CDialog::OnCancel(); RvKP&  
} S!<YVQq  
!TY9\8JzV  
void CCaptureDlg::OnAbout() \UM9cAX`  
{ ^]w!ow41  
 CAboutDlg dlg; y:(OZ%g  
 dlg.DoModal(); yjUZ 40Dq  
} Ov"]&e(I[  
PE3FuJGz  
void CCaptureDlg::OnBrowse() km2('t7?  
{ ;LE4U OK  
 CString str; } r$&"wYM  
 BROWSEINFO bi; q65KxOf`  
 char name[MAX_PATH]; $E3- </ f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e*p7(b-  
 bi.hwndOwner=GetSafeHwnd(); zWpJ\/k~  
 bi.pszDisplayName=name; zbK=yOIOd  
 bi.lpszTitle="Select folder"; /^^t>L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; XL@i/5C[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~K}iVX  
 if(idl==NULL) $2qZds[  
  return; R06L4,/b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )I'?]p<  
 str.ReleaseBuffer(); C( 8i0(1  
 m_Path=str; W[BZ/   
 if(str.GetAt(str.GetLength()-1)!='\\') )=l~XV  
  m_Path+="\\"; "a))TV%N  
 UpdateData(FALSE); [2?|BUtD[  
} XlUM~(7+v  
[ qt hn[3  
void CCaptureDlg::SaveBmp() O=UXe]D  
{ ehk5U,d  
 CDC dc; vN:gu\^-   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8uq^Q4SU  
 CBitmap bm; >Jh*S`e  
 int Width=GetSystemMetrics(SM_CXSCREEN); F8M&.TE_3  
 int Height=GetSystemMetrics(SM_CYSCREEN); y\K r@;q0w  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  H"czF  
 CDC tdc; K}"xZy Tm1  
 tdc.CreateCompatibleDC(&dc); x8k7y:  
 CBitmap*pOld=tdc.SelectObject(&bm); 's>   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &5puGnTZ  
 tdc.SelectObject(pOld); [P.M>"c\  
 BITMAP btm; VZo[\sWf  
 bm.GetBitmap(&btm); ,Oa-AF/p  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; stuj,8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >QO^h<.>  
 BITMAPINFOHEADER bih; )3 #gpM  
 bih.biBitCount=btm.bmBitsPixel; Fw5|_@&k  
 bih.biClrImportant=0; _+PiaJ&'  
 bih.biClrUsed=0; T<(1)N1H`  
 bih.biCompression=0; zaWy7@?  
 bih.biHeight=btm.bmHeight; !z">aIj\6  
 bih.biPlanes=1; A>WMPe:sSS  
 bih.biSize=sizeof(BITMAPINFOHEADER); it]im  
 bih.biSizeImage=size; {<&i4;  
 bih.biWidth=btm.bmWidth; @_s`@ ,=  
 bih.biXPelsPerMeter=0; Ie{98  
 bih.biYPelsPerMeter=0; Qt`hUyL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #HFB* >  
 static int filecount=0; ]&6# {I-  
 CString name; HS>(y2}'  
 name.Format("pict%04d.bmp",filecount++); !/] F.0  
 name=m_Path+name; >qj.!npQD  
 BITMAPFILEHEADER bfh; M)S(:Il6Xx  
 bfh.bfReserved1=bfh.bfReserved2=0; z~&uLu  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -^sW{s0Rc  
 bfh.bfSize=54+size; `roos<F1D  
 bfh.bfOffBits=54; < kyT{[e+6  
 CFile bf; d 90  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3FRz&FS:j  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ro|mW P0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -]""Jl^  
  bf.WriteHuge(lpData,size); '%Og9Bgd+  
  bf.Close(); MMlryn||1  
  nCount++; kQ~2mU  
 } {!!df.h  
 GlobalFreePtr(lpData); !5,>[^y3  
 if(nCount==1) |^fubQs;2  
  m_Number.Format("%d picture captured.",nCount); <xM$^r)  
 else DfYOGs]@  
  m_Number.Format("%d pictures captured.",nCount); AGaM &x=  
  UpdateData(FALSE); BS3Aczwk  
} ,=sbK?&  
pde,@0(Fa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) q#LB 2M  
{ DUH\/<^g  
 if(pMsg -> message == WM_KEYDOWN) ZK:dhwer  
 { W0e+yIaR  
  if(pMsg -> wParam == VK_ESCAPE) g4b-~1[S  
   return TRUE; ?LJ$:u  
  if(pMsg -> wParam == VK_RETURN) fP3e{dVf  
   return TRUE; cs[_TJo  
 } 1ocd$)B|}  
 return CDialog::PreTranslateMessage(pMsg); TdGda'C  
} >tF3|:\  
S&/</%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3 #GZ6:rVJ  
{ aD)$aK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !ieMhJ5r  
  SaveBmp(); oh*Hzb  
  return FALSE; n>Cl;cN=  
} +c)"p4m  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `=m[(CLb  
 CMenu pop; x_za R}WI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6,C2PR_+  
 CMenu*pMenu=pop.GetSubMenu(0); 0IZaf%zYc  
 pMenu->SetDefaultItem(ID_EXITICON); A:|dY^,:?*  
 CPoint pt; /$NDH]a  
 GetCursorPos(&pt); t][U`1>i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zED#+-7  
 if(id==ID_EXITICON) yx5F]Z<M2  
  DeleteIcon(); L{`S^'P<  
 else if(id==ID_EXIT) 5mzOr4*0  
  OnCancel(); &UzeNL"]  
 return FALSE; :`u?pc27Sm  
} %=p:\+`VI  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s P=$>@3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Y~I$goT  
 AddIcon(); ]5(T{  
 return res; _#[~?g`  
} SCwAAE9s]  
RF3?q6j ,  
void CCaptureDlg::AddIcon() (EW<Ggi  
{ 5>9KW7^L  
 NOTIFYICONDATA data; i4<&zj})  
 data.cbSize=sizeof(NOTIFYICONDATA); -,xCUG<g  
 CString tip; FHztF$Z  
 tip.LoadString(IDS_ICONTIP); "i jpqI  
 data.hIcon=GetIcon(0); EY~b,MIL4  
 data.hWnd=GetSafeHwnd(); 4%!#=JCl  
 strcpy(data.szTip,tip); #h,7dz.d  
 data.uCallbackMessage=IDM_SHELL; *"cK_MH/o  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q 6>7{\8l  
 data.uID=98; #Z;6f{yWf  
 Shell_NotifyIcon(NIM_ADD,&data); Za,MzKd=  
 ShowWindow(SW_HIDE); @8keLrp  
 bTray=TRUE; g%C!)UbT  
} K4T#8K]aZF  
s |40v@ M  
void CCaptureDlg::DeleteIcon() |W't-}yf  
{ mM`zA%=  
 NOTIFYICONDATA data; }E o\=>l7  
 data.cbSize=sizeof(NOTIFYICONDATA); PK&3nXF%4  
 data.hWnd=GetSafeHwnd(); ]JGh[B1gh  
 data.uID=98; FEOr'H<3x  
 Shell_NotifyIcon(NIM_DELETE,&data); L >* F8|g  
 ShowWindow(SW_SHOW); +SM&_b  
 SetForegroundWindow(); 9gu$vF]9!  
 ShowWindow(SW_SHOWNORMAL); |X}H&wBWo  
 bTray=FALSE; j[E8C$lW  
} [cJQ"G '  
%62W[Oh5  
void CCaptureDlg::OnChange() 7CKpt.Sz6  
{ cZ8lRVaWW  
 RegisterHotkey(); |\HYq`!g%7  
} ~Te9Lq|  
g>k"R4  
BOOL CCaptureDlg::RegisterHotkey() `2WtA_  
{ ^Rel-=Z$B  
 UpdateData(); ^{ Kj{M22  
 UCHAR mask=0; rTJ='<hIy  
 UCHAR key=0; 0<g;g%   
 if(m_bControl) =D&xw2  
  mask|=4; 8 `\^wG$W  
 if(m_bAlt) i|`b2msvd  
  mask|=2; Sf_q;Ws  
 if(m_bShift) 24Y8n  
  mask|=1; 8S8^sP  
  key=Key_Table[m_Key.GetCurSel()]; [{s 1= c  
 if(bRegistered){ R,3E_me"}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); iCz0T,  
  bRegistered=FALSE; q,e{t#t  
 } n jfh4}g:  
 cMask=mask; y#Cp Vm#!>  
 cKey=key; #F>7@N:5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^*6So3  
 return bRegistered; }JP0q  
} S\\3?[!p  
8|-j]   
  四、小结 oK-T@ &-  
MU  }<-1  
  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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