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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: R Q2DTQ-$  
  {|D7H=f  
  一、实现方法 sm?V%NX&  
'YTSakNJ}  
  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: :'0.  
ly~tB LH}  
#pragma data_seg("shareddata") Yw_^]:~  
HHOOK hHook =NULL; //钩子句柄 %;MM+xVVX  
UINT nHookCount =0; //挂接的程序数目 _my!YS5n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 RR9G$}WS(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .:/[%q{k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I92orr1  
static int KeyCount =0; !<#,M9 EA&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fIwG9cR  
#pragma data_seg() ,|G~PC8  
Q8  
  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。 iwx*mC{|A  
m:x<maP# E  
  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: @b{I0+li"/  
'?)<e^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '"M9`@Y3^  
cKey,UCHAR cMask)  ;U<}2M!g  
{ X 3q2XU  
 BOOL bAdded=FALSE; $;VY`n  
 for(int index=0;index<MAX_KEY;index++){ $3)Z>p   
  if(hCallWnd[index]==0){ X(M|T]`b:  
   hCallWnd[index]=hWnd; _Qd C V`  
   HotKey[index]=cKey; U]}f]GK  
   HotKeyMask[index]=cMask; X-k$6}D  
   bAdded=TRUE; L|]!ULi$d  
   KeyCount++; /:-Y7M*   
   break;  SodYb  
  } 9gQ ]!Oq  
 } VbfTdRD-  
 return bAdded; fq4[/%6,O  
} hy wy(b3  
//删除热键 ywY[g{4+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !Y^3%B%  
{ `RHhc{  
 BOOL bRemoved=FALSE; D&*'|}RZ  
 for(int index=0;index<MAX_KEY;index++){  4"~F  
  if(hCallWnd[index]==hWnd){ ,,+iPGa<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :J;&Z{  
    hCallWnd[index]=NULL; p,K!'\  
    HotKey[index]=0; 4RL0@)0F  
    HotKeyMask[index]=0; |*v w(  
    bRemoved=TRUE; iTc q=  
    KeyCount--; /7LAd_P6  
    break; RG e2N |  
   } xua E\*m  
  } d:3OC&  
 } y#v<V1b]  
 return bRemoved; E'+?7ZGWj  
} J. $U_k  
cH6<'W{*  
+nz 0ZQ9 a  
  DLL中的钩子函数如下: p-f"4vH  
1w}D fI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]US  
{ Jk} Dj0o  
 BOOL bProcessed=FALSE; <`")Zxf+  
 if(HC_ACTION==nCode) 7u<C&Z/  
 { 6rBP,\m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )MeeF-Ad6  
   switch(wParam) 2P,{`O1]  
   {  K9QC$b9(  
    case VK_MENU: ^SWV!rrg  
     MaskBits&=~ALTBIT; -(JBgM"  
     break; cI (}  
    case VK_CONTROL: xz3|m _)  
     MaskBits&=~CTRLBIT; bx:j`5Uj`  
     break; >)6k)$x%%  
    case VK_SHIFT: "U|u-ka8B  
     MaskBits&=~SHIFTBIT; H8V@KB  
     break; Nin7AOO  
    default: //judge the key and send message S<81r2LT  
     break; ub9,Wd"^  
   } a\*_b2 ^n  
   for(int index=0;index<MAX_KEY;index++){ aSt:G*a"  
    if(hCallWnd[index]==NULL) d8J(~$tXQN  
     continue; {4>N2mP{M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;( [^+_/  
    { ~S~4pK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F*p@hl  
     bProcessed=TRUE; D_M73s!U  
    } >)bn #5  
   } irF+(&q]jh  
  } 5%]O'h  
  else if((lParam&0xc000ffff)==1){ //有键按下 TT^L) d  
   switch(wParam) \{. c0  
   { "L+NN|  
    case VK_MENU: NX8. \Pf#  
     MaskBits|=ALTBIT; _rz7)%Y'#$  
     break; ?X@uR5?{  
    case VK_CONTROL: u?SxaGEa  
     MaskBits|=CTRLBIT; ?U3~rro!  
     break; *T2kxN,Ik  
    case VK_SHIFT: ^_t7{z%sA[  
     MaskBits|=SHIFTBIT; hVW1l&s  
     break; uJU;C.LX  
    default: //judge the key and send message PQXCT|iJ  
     break; z=C<@ki`  
   } {w mP  
   for(int index=0;index<MAX_KEY;index++){ `<(o;*&Gd  
    if(hCallWnd[index]==NULL) 6ag0c&k  
     continue; $GQ{Ai:VwF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #&sn l  
    { Lklb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C ett*jm_  
     bProcessed=TRUE; x.>&|Ej  
    } Nt~G  {m  
   } 7T?T0x3>  
  } jH[{V[<# X  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 d RHw]!.  
   for(int index=0;index<MAX_KEY;index++){ x,Z:12H0  
    if(hCallWnd[index]==NULL) ntn ~=oL  
     continue; !RwMUnp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yAQ)/u[|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :?:R5_Nd=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vu3zZMl  
   } Z9 zsvg  
  } &{S@v9~IT  
 } ;-VXp80J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o"g<Vz  
} USV;j%U4*  
h y"=)n(  
  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: B6U4>ZN  
s:J QV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7W=s.Gy7G\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K Vnz{cx`  
KNSMx<GP  
  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: ?|{tWR,Vb  
K}QZdN']  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?GGBDql  
{ ^]9.$$GU\A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *a'I  
 { /\m>PcPa  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'h>CgR^NM1  
  SaveBmp(); xd!GRJ<I  
  return FALSE; K%YR; )5A  
 } ese?;1r  
 …… //其它处理及默认处理 C,,S<=L:  
} 0>yu Bgh  
s\.\z[1  
d+]/0J!c  
  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。 r^`~GG!,Q  
^`fqK4<  
  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。 \'+P5,  
|t_SN,)dd  
  二、编程步骤 )@6iQ  
3u4P [   
  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"; ~X,ZZ 9H  
)odz/\9n3c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N2&h yM  
( \7Yo^  
  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; t{O2JF#5u  
M+WN\.2pX  
  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; "BvDLe':  
\8]("l}ms8  
  5、 添加代码,编译运行程序。 +,J!xy+~,  
4x_# 1 -  
三、程序代码 =/bC0bb{i  
PF:'dv  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _s+_M+@et  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8 )= "Ee  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,ZvlK N  
#if _MSC_VER > 1000 #X*=oG  
#pragma once wcW}Sv[r  
#endif // _MSC_VER > 1000 G,XUMZ  
#ifndef __AFXWIN_H__ tTPjCl  
#error include 'stdafx.h' before including this file for PCH <4%PT2R  
#endif E*8 3N@i  
#include "resource.h" // main symbols 9C|-|mo  
class CHookApp : public CWinApp EkEQFd 5g  
{ hc]5f3Z  
 public: TlJ'pG 4^  
  CHookApp(); 92Rm{n   
  // Overrides o.])5i_HV  
  // ClassWizard generated virtual function overrides :@J.!dokF  
  //{{AFX_VIRTUAL(CHookApp) v.Xmrry  
 public: CwsC)]{/o  
  virtual BOOL InitInstance(); qIk( ei  
  virtual int ExitInstance(); A<{&?_U  
  //}}AFX_VIRTUAL ~4M?[E&  
  //{{AFX_MSG(CHookApp) O:+?:aI@  
  // NOTE - the ClassWizard will add and remove member functions here. IvM>z03  
  // DO NOT EDIT what you see in these blocks of generated code ! Yn8aTg[J  
  //}}AFX_MSG [+b&)jN*2  
  DECLARE_MESSAGE_MAP() "@rXN"4  
}; JvM:xy9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VP:9&?>G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @T~~aQFk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A'T: \Wl  
BOOL InitHotkey(); Kj* $'('  
BOOL UnInit(); ~s>Ud<l%r  
#endif Hw~?%g:<S  
"K#zY~>L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. w'<"5F`  
#include "stdafx.h" iTJE:[W"y  
#include "hook.h" I|)U>bV  
#include <windowsx.h> ? 9;r|G  
#ifdef _DEBUG lM[FT=M  
#define new DEBUG_NEW DQ= /Jr~  
#undef THIS_FILE VHx:3G  
static char THIS_FILE[] = __FILE__; -h{|u{t  
#endif b!z kQ?h  
#define MAX_KEY 100 {'[S.r`  
#define CTRLBIT 0x04 jC L 1Bj  
#define ALTBIT 0x02 {S5j;  
#define SHIFTBIT 0x01 $@<cZ4  
#pragma data_seg("shareddata") >jpk R  
HHOOK hHook =NULL; `h$^=84  
UINT nHookCount =0; e%JH q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey a<v!5\dq!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '%[r9 w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6|]e}I@<2  
static int KeyCount =0; 7oZtbBs]M  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ll0"<G2t  
#pragma data_seg() 4i(?5p>f  
HINSTANCE hins; ;<nQl,2N  
void VerifyWindow(); GA2kg7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "$PX [:  
//{{AFX_MSG_MAP(CHookApp) 0 LIRi%N5*  
// NOTE - the ClassWizard will add and remove mapping macros here. `*--vSi  
// DO NOT EDIT what you see in these blocks of generated code! hbE~.[Y2r  
//}}AFX_MSG_MAP GJn ~x  
END_MESSAGE_MAP() T#-U\C~o  
@Jr@ fF}  
CHookApp::CHookApp() B"2#}HM  
{ _W gpk 0  
 // TODO: add construction code here, n@y*~sG]  
 // Place all significant initialization in InitInstance kr>F=|R]  
} ' +E\-X  
jT1^oXn@  
CHookApp theApp; )UAkg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Fle pM*  
{ vlh$NK+F  
 BOOL bProcessed=FALSE; U$ 22r b  
 if(HC_ACTION==nCode) Yo[Pu< zR  
 { R6-Z]H u  
  if((lParam&0xc0000000)==0xc0000000){// Key up L~ e{Vv8UR  
   switch(wParam) E  *{_=pX  
   { TqTz  
    case VK_MENU: do=s=&T  
     MaskBits&=~ALTBIT; }<g- 0&GLm  
     break; l$3YJ.n|s~  
    case VK_CONTROL: $gysy!2}.  
     MaskBits&=~CTRLBIT; P%Tffsl  
     break; ~oE@y6Q  
    case VK_SHIFT: (v1~p3H  
     MaskBits&=~SHIFTBIT; c<]~q1  
     break; 41NVF_R6J  
    default: //judge the key and send message  @t<KS&  
     break; <F<jx"/)  
   } -VkPy<)  
   for(int index=0;index<MAX_KEY;index++){ c,_??8  
    if(hCallWnd[index]==NULL) )_\q)t"=  
     continue; ?`U=Ps  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2~RG\JWTA  
    { 7V-'><)gI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R&9Q#n-  
     bProcessed=TRUE; j|2s./!Qg  
    } ;eT+Ly|{  
   } Bd>a"3fA  
  } 1 JB~G7  
  else if((lParam&0xc000ffff)==1){ //Key down hLF;MH@  
   switch(wParam) gPw{'7'U  
   { d .t$VRO  
    case VK_MENU: vbSycZ2M7  
     MaskBits|=ALTBIT; !nt[J$.z^  
     break; 5Za%EaW%G  
    case VK_CONTROL: C}Ucyzfr,p  
     MaskBits|=CTRLBIT; D%!GY1wdn  
     break; 'O[0oi&  
    case VK_SHIFT: pT'jX^BU  
     MaskBits|=SHIFTBIT; 2tI,`pSU  
     break; @t4OpU<'*b  
    default: //judge the key and send message #MAXH7[  
     break; QI*<MF,1  
   } *5d6Q   
   for(int index=0;index<MAX_KEY;index++) 5`p>BJ+n  
   { P9jPdls  
    if(hCallWnd[index]==NULL) +~f=L- >  
     continue; 2VaKt4+`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (Fs{~4T  
    { /M Z^;XG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -T{G8@V0I  
     bProcessed=TRUE; jzd)jJ0M  
    } 3o BR  
   } X}B ]0z>  
  } z4{ :X Da  
  if(!bProcessed){ Sjo7NR^#e  
   for(int index=0;index<MAX_KEY;index++){ S<eB&qT$  
    if(hCallWnd[index]==NULL) HMmB90P`  
     continue; *cAI gO7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MIdViS.g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DTvCx6:!  
   } p> g[: ~  
  } fi  [4F  
 } %uDH_J|^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); y~^-I5!_ u  
} 0t7vg#v|  
;Q,, i  
BOOL InitHotkey() uF+0nv+  
{ zD;k|"e  
 if(hHook!=NULL){ `G`y A%  
  nHookCount++; c3.;o  
  return TRUE; ?z&5g-/b  
 } u=t.1eS5  
 else mM.YZUX  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); EYA=fU  
  if(hHook!=NULL) b_^y Ke^W  
   nHookCount++; 0ZJj5<U  
  return (hHook!=NULL); ><I{R|bC  
} VS@e[,  
BOOL UnInit() .F G%QFF~  
{ u9fJ:a  
 if(nHookCount>1){ @Gt.J*!s/  
  nHookCount--; \,pObWm  
  return TRUE; O L 9(~p  
 } 1!NrndJI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rn/~W[  
 if(unhooked==TRUE){ .y<u+)  
  nHookCount=0; mM:%-I\$   
  hHook=NULL; zd/kr  
 } tAsap}(  
 return unhooked; ERia5HnoD,  
} RL3*fRlb  
<w`EU[y_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p6!5}dD(  
{ D -d  
 BOOL bAdded=FALSE; zwz_K!229  
 for(int index=0;index<MAX_KEY;index++){ hfw+n<  
  if(hCallWnd[index]==0){ Q[ ?R{w6  
   hCallWnd[index]=hWnd; *2pf> UzL  
   HotKey[index]=cKey; @JGFG+J}  
   HotKeyMask[index]=cMask; /l_u $"  
   bAdded=TRUE; sC0u4w>Y  
   KeyCount++; +abb[  
   break; u /]P  
  } *jvP4Nz)k  
 } "blq)qo)  
 return bAdded; `!$6F:d_l  
} lv9Tq5C  
'v9M``  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DQ30\b"gU  
{ bv VkN  
 BOOL bRemoved=FALSE; -DK6(<:0  
 for(int index=0;index<MAX_KEY;index++){ uVKe?~RC  
  if(hCallWnd[index]==hWnd){ ="v`W'Pd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mPHto-=fB  
    hCallWnd[index]=NULL; 4hc[ rN,]  
    HotKey[index]=0; '&e8;X  
    HotKeyMask[index]=0; ,n[<[tkCR  
    bRemoved=TRUE; 6<T:B[a-  
    KeyCount--; 1Iy1xiP  
    break; WMC\J(@.  
   } H(gY =  
  } (qvH=VTwP  
 } v0VQ4>  
 return bRemoved; AO>b\,0Me  
} w^Yo)"6  
YoW)]n  
void VerifyWindow() !y B4;f$  
{ g(W+[kj)  
 for(int i=0;i<MAX_KEY;i++){ 57EX#:a  
  if(hCallWnd!=NULL){ e5 L_<V^Jo  
   if(!IsWindow(hCallWnd)){ +<.o,3  
    hCallWnd=NULL; q&J5(9]O|L  
    HotKey=0; >~nr,V.q  
    HotKeyMask=0; bm 4RRI  
    KeyCount--; i%[gNh  
   } rJkJ/9s  
  } y: x<`E=  
 } q)L4*O  
} ;Mo_B9  
tT>LOI_z  
BOOL CHookApp::InitInstance() nj:w1E/R  
{ "gJ.mhHX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bj}Lxc],  
 hins=AfxGetInstanceHandle(); NS2vA>n8R  
 InitHotkey(); z4Zm%  
 return CWinApp::InitInstance(); v}N\z2A  
} w~)tEN>  
5{k,/Z[L  
int CHookApp::ExitInstance() :>JfBJ]|  
{ d\nXK#)Q  
 VerifyWindow(); zmGHI! tP  
 UnInit(); V~[b`&F  
 return CWinApp::ExitInstance(); ,wes*  
} m9A%Z bQ^  
$QwpoVp`~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )f|`mM4DW!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %]&$VVVh  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ T2S_> #."l  
#if _MSC_VER > 1000 05R"/r*  
#pragma once pT->qQ3;  
#endif // _MSC_VER > 1000 4h@,hY1#  
H^*AaA9-   
class CCaptureDlg : public CDialog d/ ^IL*O  
{ sdZ$3oE.  
 // Construction XJ\R'?j  
 public: uAeo&|&  
  BOOL bTray; Zh;wQCDj  
  BOOL bRegistered;  x)Bbo9J  
  BOOL RegisterHotkey(); 3 R+e  
  UCHAR cKey; kEnGr6e  
  UCHAR cMask; ?-<lIF Fh  
  void DeleteIcon(); d,Aa8I  
  void AddIcon(); XLt/$Caf  
  UINT nCount; {73V?#P4  
  void SaveBmp(); O'wmhLa"W  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor XQ}J4J~Vm  
  // Dialog Data G-T^1?  
  //{{AFX_DATA(CCaptureDlg) ")No t$8  
  enum { IDD = IDD_CAPTURE_DIALOG }; !vAmjjB  
  CComboBox m_Key; bPxL+ +  
  BOOL m_bControl; ;yomaAr  
  BOOL m_bAlt; hJ{u!:4  
  BOOL m_bShift; }8x+F2i  
  CString m_Path; ud `- w  
  CString m_Number; vd[7Pxe  
  //}}AFX_DATA 9Vm1q!lE  
  // ClassWizard generated virtual function overrides ]qT&6:;-]  
  //{{AFX_VIRTUAL(CCaptureDlg) -p_5T*R  
 public: f"FFgQMkv  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <3{MS],<<  
 protected: ?"9h-g3`x}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !{.CGpS ]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [ @eA o>  
  //}}AFX_VIRTUAL _eiqs  
  // Implementation xUdGSr50  
 protected: v;<gCzqQh  
  HICON m_hIcon; U S ALoe  
  // Generated message map functions %LMpErZO  
  //{{AFX_MSG(CCaptureDlg) "V>}-G&  
  virtual BOOL OnInitDialog(); `HRL .uX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QgqJ #  
  afx_msg void OnPaint(); fwz:k]vk  
  afx_msg HCURSOR OnQueryDragIcon(); >8(i;)(3  
  virtual void OnCancel(); +-<G(^  
  afx_msg void OnAbout(); ;98&5X\u<  
  afx_msg void OnBrowse(); d^}p#7mB\  
  afx_msg void OnChange(); juOStTq<  
 //}}AFX_MSG $os]$5(  
 DECLARE_MESSAGE_MAP() * hs&^G  
}; z,TH}s6  
#endif  8${n}}  
4?+K `  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file n?@zp<  
#include "stdafx.h" bZYayjxZ5i  
#include "Capture.h" f(|k0$EIu  
#include "CaptureDlg.h" Nbpn"*L,  
#include <windowsx.h> 9!_,A d;3  
#pragma comment(lib,"hook.lib") n= <c_a)Nb  
#ifdef _DEBUG 1jg* DQ7L  
#define new DEBUG_NEW YcobK#c  
#undef THIS_FILE +\T8`iCFB  
static char THIS_FILE[] = __FILE__; _aFe9+y  
#endif eC!=4_lx)  
#define IDM_SHELL WM_USER+1 nEsD+ }E?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Nnh\FaI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _c>ww<*3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; i=xh;yb|  
class CAboutDlg : public CDialog U*C^g}iA  
{ w6V/Xp][U  
 public: sv=U^xI  
  CAboutDlg(); B5z'Tq1  
  // Dialog Data T>B'T3or  
  //{{AFX_DATA(CAboutDlg) 3*h"B$g!  
  enum { IDD = IDD_ABOUTBOX }; s:tX3X  
  //}}AFX_DATA a dqS.xs  
  // ClassWizard generated virtual function overrides \t!~s^Oox  
  //{{AFX_VIRTUAL(CAboutDlg) vu+g65"  
 protected: KmNnW1T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PMytk`<`zw  
  //}}AFX_VIRTUAL V$ H(a`!  
  // Implementation ?/o 8f7Z  
 protected: Yg8* )u0  
  //{{AFX_MSG(CAboutDlg) H'k}/<%Q  
  //}}AFX_MSG 5pJe`}O4  
  DECLARE_MESSAGE_MAP() eNd&47lJ  
}; 712nD ?>  
M^Sa{S*?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) L?h?LZnq  
{ kkjugm{D7  
 //{{AFX_DATA_INIT(CAboutDlg) %V>%AP  
 //}}AFX_DATA_INIT =Dq&lm,n  
} t+U.4mS-  
BH0m[9nU;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6M >@DRZ'|  
{ t5+p]7  
 CDialog::DoDataExchange(pDX); 01'>[h#_n  
 //{{AFX_DATA_MAP(CAboutDlg) `6~0W5  
 //}}AFX_DATA_MAP ~q3O,bb{   
} xxur4@p!  
<MbhBIejr  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !mxH/{+|n  
 //{{AFX_MSG_MAP(CAboutDlg) S~3|1Hw*tN  
 // No message handlers 3:iEt (iCI  
 //}}AFX_MSG_MAP H7Q$k4\l  
END_MESSAGE_MAP() qx ki  
(,h2qP-;ud  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LFax$CZc  
: CDialog(CCaptureDlg::IDD, pParent) UQu6JkbLL  
{ dL$ iTSfz"  
 //{{AFX_DATA_INIT(CCaptureDlg) q}t]lD %C  
  m_bControl = FALSE; Eiu/p&ct  
  m_bAlt = FALSE; >=0]7k;  
  m_bShift = FALSE; *\XOQWrF  
  m_Path = _T("c:\\"); _RaE: )  
  m_Number = _T("0 picture captured."); 4:/V|E\D  
  nCount=0; "OenYiz  
  bRegistered=FALSE; ~LS</_N  
  bTray=FALSE; _bCAZa&&  
 //}}AFX_DATA_INIT t"4* ]S  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F-s{#V1=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ye.6tlW  
} \8xSfe  
?"Ez  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dcY(1p)  
{ a<&K^M&  
 CDialog::DoDataExchange(pDX); q KD  
 //{{AFX_DATA_MAP(CCaptureDlg) 0I.KHIB k  
  DDX_Control(pDX, IDC_KEY, m_Key); (}39f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .zgh,#=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VNTbjn]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); YD[HBF)~j  
  DDX_Text(pDX, IDC_PATH, m_Path); <W #G)c0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M*0^<e~]F  
 //}}AFX_DATA_MAP )7& -DI1  
} ,,u hEoH  
+bE{g@%@ +  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b WNa6x  
//{{AFX_MSG_MAP(CCaptureDlg) T#qf&Q Z  
 ON_WM_SYSCOMMAND() >+J}mo=*  
 ON_WM_PAINT() L ?/AKg  
 ON_WM_QUERYDRAGICON() ZR\N~.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HXU#Ux  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kf'(u..G  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |J!mM<*K  
//}}AFX_MSG_MAP g8.z?Ia#5Z  
END_MESSAGE_MAP() )8C`EPe  
Zp7Pw   
BOOL CCaptureDlg::OnInitDialog() nms[No?  
{ IVPN=jg?  
 CDialog::OnInitDialog(); ]jD\4\M}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q\<l"b z  
 ASSERT(IDM_ABOUTBOX < 0xF000); , @jtD*c)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); D \i]gfu8W  
 if (pSysMenu != NULL) =H)]HxEEM  
 { RyK~"CWT  
  CString strAboutMenu; #A5X ,-4G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2L&c91=wE  
  if (!strAboutMenu.IsEmpty()) vSHPN|*  
  { ]t)N3n6Bc  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~Y`ys[Z m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); F{jxs/~  
  } S%MDQTM  
 } Jpduk&u  
 SetIcon(m_hIcon, TRUE); // Set big icon :O413#8  
 SetIcon(m_hIcon, FALSE); // Set small icon iQ" LIeD  
 m_Key.SetCurSel(0); -7&ywgxl  
 RegisterHotkey(); |aLK_]!  
 CMenu* pMenu=GetSystemMenu(FALSE); ~+1mH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ML>M:Ik+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); bdWdvd:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); = z mxki  
 return TRUE; // return TRUE unless you set the focus to a control tn$TyCzckW  
} ?w(hPUd!2  
8?82 p  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `F/R:!v  
{ !(q@sw(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cRs.@U\{R\  
 { +A8q.-N G  
  CAboutDlg dlgAbout; d2eXN3"  
  dlgAbout.DoModal(); n>pJ/l%`  
 } DU6j0lz  
 else a2.6 S./  
 { 5[)5K?%  
  CDialog::OnSysCommand(nID, lParam); J\@g3oGw  
 } ZY8.p  
} 'nPI zK<v  
y]t19G+  
void CCaptureDlg::OnPaint() L|WrdT D;  
{ Y\WQ0'y  
 if (IsIconic()) ;@S'8  
 { |aenQA#  
  CPaintDC dc(this); // device context for painting -6J <{1V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?ja%*0 R  
  // Center icon in client rectangle 4*Hzys[{  
  int cxIcon = GetSystemMetrics(SM_CXICON); .+S%hT,v6i  
  int cyIcon = GetSystemMetrics(SM_CYICON); fNi&r0/-t  
  CRect rect; i ZPNss  
  GetClientRect(&rect); G0!6rDu2,  
  int x = (rect.Width() - cxIcon + 1) / 2; n@tt.n!{l  
  int y = (rect.Height() - cyIcon + 1) / 2; ! $mY.uu  
  // Draw the icon B~]6[Z  
  dc.DrawIcon(x, y, m_hIcon); JYj*.Q0  
 } U;iCH  
 else &-FG}|*4M  
 { ~zfF*A  
  CDialog::OnPaint(); s:l H4B  
 } rZwSo]gp  
} mf g>69,w  
P7W|e~]Yq  
HCURSOR CCaptureDlg::OnQueryDragIcon() G9-ETj}  
{ gdD|'h  
 return (HCURSOR) m_hIcon; hN K wQ  
} 423%K$710  
<D:q4t  
void CCaptureDlg::OnCancel() rAtCG1Vr  
{ ?8kFAf~  
 if(bTray) rb@[ Edj  
  DeleteIcon(); h1 (i/{}:  
  CDialog::OnCancel(); l?"^2in .  
} 9mk@\Gqqm  
j~Fd8]@  
void CCaptureDlg::OnAbout() jNx{*2._r  
{ qbSI98r w  
 CAboutDlg dlg; } l+_KA  
 dlg.DoModal(); pjS##pgVq  
} uSYI X  
E> pr})^w  
void CCaptureDlg::OnBrowse() l'[;q '  
{ x1`w{5;C 2  
 CString str; du }HTrsC  
 BROWSEINFO bi; UVLS?1ra  
 char name[MAX_PATH]; [<d ~b*/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /L2ZI1v  
 bi.hwndOwner=GetSafeHwnd(); kuBtPZ  
 bi.pszDisplayName=name; NUb$PT  
 bi.lpszTitle="Select folder"; NG3:=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Mu:zWLM*M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $X:,Q,?  
 if(idl==NULL) h&i(Kfv*  
  return; #O~pf[[L  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); GGwwdB\x'  
 str.ReleaseBuffer(); H@zZ[  
 m_Path=str; dHOH]x  
 if(str.GetAt(str.GetLength()-1)!='\\') E$8-8[  
  m_Path+="\\"; Na]Z%#~  
 UpdateData(FALSE); =>>Dnp  
} jxW/"Q   
>cjxu9Vr1K  
void CCaptureDlg::SaveBmp() "Ltp]nCR  
{ OY|9V  
 CDC dc; S.iUiS"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k}kwr[  
 CBitmap bm;  WSeiW  
 int Width=GetSystemMetrics(SM_CXSCREEN); B ( h`~pb  
 int Height=GetSystemMetrics(SM_CYSCREEN); SK/}bZ;f  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d72( g$F  
 CDC tdc; D5@}L$ u  
 tdc.CreateCompatibleDC(&dc); <MO40MP  
 CBitmap*pOld=tdc.SelectObject(&bm); J+0 ?e9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4 }_}3.  
 tdc.SelectObject(pOld); 3- d"-'k  
 BITMAP btm; FB+nN5D/  
 bm.GetBitmap(&btm); V^.Z&7+E`_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @:'E9J06  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gQ '=mU  
 BITMAPINFOHEADER bih; \(f82kv  
 bih.biBitCount=btm.bmBitsPixel; 23;\l   
 bih.biClrImportant=0; 3!*` hQ;s  
 bih.biClrUsed=0; WV|9d}5  
 bih.biCompression=0; 9p02K@wkD  
 bih.biHeight=btm.bmHeight; '@hnqcqXq  
 bih.biPlanes=1; [daR)C  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7S&O {Q7)  
 bih.biSizeImage=size; fB; o3!y  
 bih.biWidth=btm.bmWidth; 2j>C4Ck  
 bih.biXPelsPerMeter=0; uWXxK"J.  
 bih.biYPelsPerMeter=0; ^=cX L  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); nM$-L.dG  
 static int filecount=0; K}S=f\Q]  
 CString name; %HZ!s `w_  
 name.Format("pict%04d.bmp",filecount++); qP%[ nY  
 name=m_Path+name; -Xgup,}?  
 BITMAPFILEHEADER bfh; giddM2'  
 bfh.bfReserved1=bfh.bfReserved2=0; @yPI$"Ma  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cz>`$Zz  
 bfh.bfSize=54+size; 79lG~BGE  
 bfh.bfOffBits=54; x4_FG{AIu  
 CFile bf; U@:iN..  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {K=[Fu=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rlDJHR6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c*> SZ'T\  
  bf.WriteHuge(lpData,size); @(tiPV  
  bf.Close(); K)8 m?sf/  
  nCount++; o648 xUP  
 } '-X913eG!  
 GlobalFreePtr(lpData); 5th\_n}N2/  
 if(nCount==1) J&b&*3   
  m_Number.Format("%d picture captured.",nCount); ~hA;ji|I  
 else {[B`q  
  m_Number.Format("%d pictures captured.",nCount); K* 0]*am|v  
  UpdateData(FALSE); VrRBwvp-K  
} QW%BKF!  
! XNTk]!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9_S>G$9D  
{ Ne,u\q3f  
 if(pMsg -> message == WM_KEYDOWN) EabZ7zFoN  
 { ) /<\|mR  
  if(pMsg -> wParam == VK_ESCAPE) V$ss[fX  
   return TRUE; G@n%P~  
  if(pMsg -> wParam == VK_RETURN) al\ R(\p|  
   return TRUE; 1G+ ?/w  
 } wms8z  
 return CDialog::PreTranslateMessage(pMsg); 'roZ:NE  
} FmRa]31W  
Z)zmT%t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [P_1a`b  
{ m)9qO7P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #G ZGk?  
  SaveBmp(); $r=Ud >  
  return FALSE; FLekyJmw~  
} wMB<^zZmv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f)+fdc  
 CMenu pop; =w!14@W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aTy&"  
 CMenu*pMenu=pop.GetSubMenu(0); .sDVBT'%  
 pMenu->SetDefaultItem(ID_EXITICON); #_bSWV4  
 CPoint pt; UujFZg[-P9  
 GetCursorPos(&pt); z_J"Qk  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8BZDaiE"  
 if(id==ID_EXITICON) Y<S,Xr;J:  
  DeleteIcon(); daZY;_{"o  
 else if(id==ID_EXIT) 7Jm9,4]  
  OnCancel(); i.Qy0  
 return FALSE; LPk85E  
} ,9f$a n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); U>^ -Db]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,wlh0;,  
 AddIcon(); @3K 4,s  
 return res; toEmIa~o6  
} <c6C+OWT,  
;o#R(m@Lx  
void CCaptureDlg::AddIcon() ds4)Nk4%O  
{ (6G5UwSt  
 NOTIFYICONDATA data; 7oDr`=q1]r  
 data.cbSize=sizeof(NOTIFYICONDATA); Z;W`deA  
 CString tip; w7"Z @$fs  
 tip.LoadString(IDS_ICONTIP); lfKrd3KS_  
 data.hIcon=GetIcon(0); qf9.S)H1Z  
 data.hWnd=GetSafeHwnd(); *"Ipu"G5?  
 strcpy(data.szTip,tip); t\]CdH`+  
 data.uCallbackMessage=IDM_SHELL; B" wk:\zC  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8_ns^6XK5p  
 data.uID=98; cv0}_<Tyx  
 Shell_NotifyIcon(NIM_ADD,&data); n5%rsNxg  
 ShowWindow(SW_HIDE); !\8j[QS!  
 bTray=TRUE; ?iUAzM8  
} 3M(:}c  
5_nkN`x  
void CCaptureDlg::DeleteIcon() [Qv%  
{ a$FELlMv  
 NOTIFYICONDATA data; oG5JJpLT  
 data.cbSize=sizeof(NOTIFYICONDATA); xk}YeNVj  
 data.hWnd=GetSafeHwnd(); /"Om-DK%  
 data.uID=98; VzMoWD;  
 Shell_NotifyIcon(NIM_DELETE,&data); 8Hs>+Udl  
 ShowWindow(SW_SHOW); WFg'G>*  
 SetForegroundWindow(); Ni{ (=&*=  
 ShowWindow(SW_SHOWNORMAL); } CJQC  
 bTray=FALSE; >GgX-SZ%  
} nKh._bvfX  
iR(A ^  
void CCaptureDlg::OnChange() ID5?x8o#k  
{ 6$b"tdP  
 RegisterHotkey(); +?(2-RBd  
} >&aFSL,f  
-";'l @D=  
BOOL CCaptureDlg::RegisterHotkey() ~c :e0}  
{ 6U7z8NV&[  
 UpdateData(); .7Ys@;>B  
 UCHAR mask=0; ^,b*.6t  
 UCHAR key=0; PT|^RF%fT  
 if(m_bControl) ,ibI@8;#~'  
  mask|=4; Z.:5< oEKg  
 if(m_bAlt) {`KgyC W:  
  mask|=2; PQXyu1  
 if(m_bShift) lyIstfRh15  
  mask|=1; 9.lSF  
  key=Key_Table[m_Key.GetCurSel()]; KcfW+> W3  
 if(bRegistered){ .?_wcp=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |VlAt#E  
  bRegistered=FALSE; WMZa6cH  
 } Q{H88g^=J  
 cMask=mask; Cr4shdN34  
 cKey=key; ,^,Vq]$3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )dJM  
 return bRegistered; bI@+Or  
} 2#*Bw=  
BYVp~!u  
  四、小结 xh @H@Q\  
doP4N6   
  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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