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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: KMy"DVqE  
  &t<g K D  
  一、实现方法 ^uUA41o`eJ  
}W:Z>vam+  
  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: 8,IF%Z+LI  
e16H @  
#pragma data_seg("shareddata") t{iRCj  
HHOOK hHook =NULL; //钩子句柄 tT)s,R%  
UINT nHookCount =0; //挂接的程序数目 -~8PI2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 K% FK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o"X..m<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pp(09y`]  
static int KeyCount =0; =Mwuhk|*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1O0. CC,p  
#pragma data_seg() G) KI{D  
>qNpY(Ql  
  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。 XV%R Mr6  
59 g//;35@  
  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: H ;=^ W  
80lhhqRC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ";7N$hWE  
cKey,UCHAR cMask) O DN_i  
{ Yz0fOX  
 BOOL bAdded=FALSE; !J;Bm,Xn6  
 for(int index=0;index<MAX_KEY;index++){ :$u[1&6  
  if(hCallWnd[index]==0){ 6 ~0kb_td  
   hCallWnd[index]=hWnd; <bhGpLh-E  
   HotKey[index]=cKey; s(Gs?6}>T  
   HotKeyMask[index]=cMask; 5[X%17&t  
   bAdded=TRUE; ,5W u  
   KeyCount++; KPz0;2}  
   break; BZ.l[LMp  
  } ${z#{c1  
 } MMKN^a"GA  
 return bAdded; sjLMM_'  
} OW};i|  
//删除热键 meV Z_f/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +%9Re5R  
{ b`+yNf  
 BOOL bRemoved=FALSE; Ix_w.f=8  
 for(int index=0;index<MAX_KEY;index++){ k%~;mu"4}  
  if(hCallWnd[index]==hWnd){ Bq)dqLwk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f:\)! &W  
    hCallWnd[index]=NULL; [n/c7Pe  
    HotKey[index]=0; / S' +  
    HotKeyMask[index]=0; S'|PA7a}h  
    bRemoved=TRUE; n.9k5r@  
    KeyCount--; g`'!Vgd?M[  
    break; Brs6RkRf  
   } ~fD\=- S1  
  } DTA$,1JuD  
 } x f{`uHa8  
 return bRemoved; F5:xrcyC  
} Sd ^I >;  
d.w]\  
6BA$v-VVU  
  DLL中的钩子函数如下: ?`xF>P]M  
p+?`ru  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;Ngk"5  
{ ,rN$ah$CL  
 BOOL bProcessed=FALSE; _Cz98VqRk  
 if(HC_ACTION==nCode) } x r0m+/  
 { :I&y@@UG  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _XP}f x7$C  
   switch(wParam) mYo~RXKGF  
   {  7{M&9| aK  
    case VK_MENU: q M_c-^F  
     MaskBits&=~ALTBIT; Jf= V<  
     break; #]1 jvB  
    case VK_CONTROL: |)>+& xk  
     MaskBits&=~CTRLBIT; %pxJ27Q  
     break; rlh:| #GTJ  
    case VK_SHIFT: y-H9fWi8Y&  
     MaskBits&=~SHIFTBIT; kw z6SObQ  
     break; `,~'T [  
    default: //judge the key and send message T$0)un  
     break; A405igF  
   }  #9}1Lo>  
   for(int index=0;index<MAX_KEY;index++){ g"'BsoJ  
    if(hCallWnd[index]==NULL) zx8@4?bK  
     continue; *^; MWI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M {'(+a[  
    { ?;UR9f|!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bt")RG  
     bProcessed=TRUE; pe,y'w{  
    } & .1-6  
   } aO}hE 2]  
  } <L8FI78[*  
  else if((lParam&0xc000ffff)==1){ //有键按下 i75\<X  
   switch(wParam) e%ro7~  
   { 8dx 7@y?z  
    case VK_MENU: b/oNQQM#Dk  
     MaskBits|=ALTBIT; ^zT=qB l  
     break; dKEy6C"@  
    case VK_CONTROL: w2b(,w  
     MaskBits|=CTRLBIT; -J 6`  
     break; |PYyhY  
    case VK_SHIFT: -a|b.p  
     MaskBits|=SHIFTBIT; ua=7YG  
     break; )d3C1Pd>  
    default: //judge the key and send message sbVEA  
     break; cyd&bxPgj+  
   } C=Fu1Hpb  
   for(int index=0;index<MAX_KEY;index++){ *wx%jbJo  
    if(hCallWnd[index]==NULL) l%Ke>9C  
     continue; R*cef  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W.{+0xx  
    { _0u=}tc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); JT<JS6vw#  
     bProcessed=TRUE; 'tkQz  
    } "h1ek*(?<  
   } %$b}o7U"s  
  } ;s$4/b/~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 URj)]wp/  
   for(int index=0;index<MAX_KEY;index++){ O251. hXK  
    if(hCallWnd[index]==NULL) Sru0j/|H\  
     continue; *^{j!U37s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,if~%'9j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fO5L[U^`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (  -q0!]E  
   } $tW E9_  
  } .EWjeVq  
 } \rh+\9(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6||%T$_;}  
} C[TjcHoA  
c^H#[<6p  
  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: 80%"2kG  
x{!+ 4W;S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v h)CB8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XD6Kp[s  
o@ ^^;30  
  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: /160pl 4  
EGv]K|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )!VJ\  
{ v;z8g^L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (aJ$1bT=T  
 { )L "Dt_t  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^j.3'}p  
  SaveBmp(); # ^,8JRA  
  return FALSE; /8:e| ]  
 } 9+ve0P7$  
 …… //其它处理及默认处理 Sa)L=5Nr  
} Z{%W!>0  
B/Q>i'e  
e$ QMR.'  
  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。 =7kn1G.(  
H9BqE+  
  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。 ]o'dr r  
\jZmu  
  二、编程步骤 BUi,+NdIk  
d5 ]-{+V+  
  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"; ,=@WE> ip  
%2'4h(Oq^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; nip*Y@-F  
2XUIC^<@s  
  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; lxD~l#)^ln  
_E0yzkS  
  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; 2C"i2/NH'  
c?c"|.-<p  
  5、 添加代码,编译运行程序。 x)%"i)  
-`spu)  
三、程序代码 fK(:vwh  
7r(c@4yPI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6 AY~>p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) })mD{c/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WT,dTn;W  
#if _MSC_VER > 1000 [<^'}-SJ  
#pragma once Y nTx)uW  
#endif // _MSC_VER > 1000 O]="ggq&  
#ifndef __AFXWIN_H__ =NK'xPr  
#error include 'stdafx.h' before including this file for PCH &jnBDr  
#endif 6PWw^Cd  
#include "resource.h" // main symbols P?8$VAkj  
class CHookApp : public CWinApp D}ZPgt#   
{ )`|`PB  
 public: / a}N6KUi  
  CHookApp(); j{t r''yN  
  // Overrides w9x5IRWk  
  // ClassWizard generated virtual function overrides E 6Uj8]P`  
  //{{AFX_VIRTUAL(CHookApp) z+0#H39&  
 public: s"tH?m )6  
  virtual BOOL InitInstance(); $S?xB$  
  virtual int ExitInstance(); |a\,([aU  
  //}}AFX_VIRTUAL HmsXV_B8[Y  
  //{{AFX_MSG(CHookApp) E.*wNah"U  
  // NOTE - the ClassWizard will add and remove member functions here. V^ ;l g[:  
  // DO NOT EDIT what you see in these blocks of generated code ! W8]?dL}|  
  //}}AFX_MSG Qe9}%k6@E  
  DECLARE_MESSAGE_MAP() 7<8'7<X  
}; j\B taC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4w 7vgB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .",BLuce  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b?M. 0{"H  
BOOL InitHotkey(); 6|6O| <o  
BOOL UnInit(); $`C$|9S  
#endif t B}W )Eb  
Ms%C:KG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %f&Bt,xEo  
#include "stdafx.h" t08[3Q&  
#include "hook.h" aiw4J  
#include <windowsx.h> "KC3+:tm  
#ifdef _DEBUG B.b sU  
#define new DEBUG_NEW =(,kjw88w  
#undef THIS_FILE 0+_;6  
static char THIS_FILE[] = __FILE__; {FC<vx{42  
#endif _39VL  
#define MAX_KEY 100 8y?q)y9h  
#define CTRLBIT 0x04 S@,x^/vT  
#define ALTBIT 0x02 0@&;JMh6<  
#define SHIFTBIT 0x01 ^d9o \  
#pragma data_seg("shareddata") ^@'zQa  
HHOOK hHook =NULL; 0*uJS`se6Z  
UINT nHookCount =0; ^zG!Z:E  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ']X0g{%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT m[N&UM#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )4YtdAV  
static int KeyCount =0; I|/|\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift eNFA.*p<  
#pragma data_seg() 85FzIX-F%  
HINSTANCE hins; ^(qR({cX  
void VerifyWindow(); B SEP*#s  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Bq,Pk5b  
//{{AFX_MSG_MAP(CHookApp) pqbKPpG  
// NOTE - the ClassWizard will add and remove mapping macros here. D/2;b;-  
// DO NOT EDIT what you see in these blocks of generated code! u<+RA  
//}}AFX_MSG_MAP MLDAr dvK  
END_MESSAGE_MAP() Zc9S[ivq  
eQ#"-i  
CHookApp::CHookApp() LXc;`]  
{ R~d Wblv  
 // TODO: add construction code here, EiA_9%<  
 // Place all significant initialization in InitInstance ar`}+2Qh0  
} 2m&?t_W  
/w*HxtwFmD  
CHookApp theApp; eX^ F^(   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p,)pz_M  
{ Ao *{#z   
 BOOL bProcessed=FALSE; 'GZ,  
 if(HC_ACTION==nCode) cyI:dvg  
 { ~~,#<g[  
  if((lParam&0xc0000000)==0xc0000000){// Key up &e4EZ  
   switch(wParam) H"V)dEm  
   { Aacj?   
    case VK_MENU: R"71)ob4  
     MaskBits&=~ALTBIT; vrsOA@ee3H  
     break; pD6a+B\;k  
    case VK_CONTROL: '&y+,2?;Y[  
     MaskBits&=~CTRLBIT; rAu@`H?  
     break; \#'m([<e  
    case VK_SHIFT: hl+ T  
     MaskBits&=~SHIFTBIT; 1~*JenV-  
     break; %bTXu1  
    default: //judge the key and send message *&F~<HC2+  
     break; 73E[O5?b  
   } t(- 5l  
   for(int index=0;index<MAX_KEY;index++){ pH?"@  
    if(hCallWnd[index]==NULL) m8v=pab e  
     continue; :\#/T,K"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]=5D98B  
    { ~uO9>(?D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); m\|ie8  
     bProcessed=TRUE; kQtnT7  
    } I9 jzR~T  
   } $K~ t'wr  
  } uo^tND4a;j  
  else if((lParam&0xc000ffff)==1){ //Key down !ma'*X  
   switch(wParam) ]~m2#g%  
   { Ktf lbI!  
    case VK_MENU: 'A#l$pJp7  
     MaskBits|=ALTBIT; |+Ub3<b[]  
     break; #xxs^Kbqa#  
    case VK_CONTROL: gG46hO-M%x  
     MaskBits|=CTRLBIT; y/Q,[Uzk\  
     break; +q~dS.  
    case VK_SHIFT: H:L<gv(rG  
     MaskBits|=SHIFTBIT; =q*j". <  
     break; v6KF0mqA&  
    default: //judge the key and send message *5 S~@  
     break; nx`I9j\  
   } -(![xZ1{K  
   for(int index=0;index<MAX_KEY;index++) kM@heFJb.  
   { ^WIGd"^  
    if(hCallWnd[index]==NULL) p GSS   
     continue; iED gcg7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gA DF  
    { " [K>faV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Hz3KoO &  
     bProcessed=TRUE; *8xMe  
    } 1"} u51  
   } %>k$'UWzK  
  } 5 ]@"f/  
  if(!bProcessed){ H5p&dNO  
   for(int index=0;index<MAX_KEY;index++){ g=n /w  
    if(hCallWnd[index]==NULL) =xsTVT;sj  
     continue; 8u#2M8.5E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [e`6gGO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); THDyb9_g  
   } . ,n>#lL  
  } U_C 1GT-|  
 } ioS(;2F  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RE75TqYW  
} [>U =P`  
NYp46;  
BOOL InitHotkey() 3n=ftkI  
{ %u02KmV.  
 if(hHook!=NULL){ 5Qgh\4  
  nHookCount++; ~i/K7qZ  
  return TRUE; .Zv uhOn^  
 } Q96^rjY  
 else iwT PJGK|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;R{ffS6  
  if(hHook!=NULL) "iTi+UZxe  
   nHookCount++; jr=erVHK  
  return (hHook!=NULL); f 8836<c  
} @t?uhT*Z=  
BOOL UnInit() O0 ,=@nw8.  
{ |4|j5<5  
 if(nHookCount>1){ I Z{DR  
  nHookCount--; %w3"B,k'9D  
  return TRUE; c0u1L@tj  
 } "AUHe6Yv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .=<<b|  
 if(unhooked==TRUE){ ?mJ&zf|B8  
  nHookCount=0; M[7$cfp-Y~  
  hHook=NULL; _mn2bc9M  
 } ORP-@-dap  
 return unhooked; lr_c  
} P+t`Rw  
Ov PTgiI!N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rc+}KO  
{ (S1Co&SX  
 BOOL bAdded=FALSE; r;c ILS|Xr  
 for(int index=0;index<MAX_KEY;index++){ 8[xl3=  
  if(hCallWnd[index]==0){ Doc_rQYku  
   hCallWnd[index]=hWnd; g<$q#l~4xH  
   HotKey[index]=cKey; mJL=H  
   HotKeyMask[index]=cMask; U[t/40W}P  
   bAdded=TRUE; \RDS~u\d  
   KeyCount++; 6@; P  
   break; Cmj+>$')0  
  } o6T'U#7P  
 } 1'"TO5  
 return bAdded; NANgV~Y&  
} @Xg5 E  
5VR=D\j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S{#L7S  
{ K]c\3[vR  
 BOOL bRemoved=FALSE; .bvEE  
 for(int index=0;index<MAX_KEY;index++){ dcbE<W#ss  
  if(hCallWnd[index]==hWnd){ &Y3 r'"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OT{cP3;0*o  
    hCallWnd[index]=NULL; !ZrU@T  
    HotKey[index]=0; R7ze~[oF  
    HotKeyMask[index]=0; J_rb3  
    bRemoved=TRUE; JOFQyhY0>m  
    KeyCount--; ^^Te  
    break; @K=C`N_22  
   } GZWU=TC2{2  
  } GW;O35 m  
 } :ExCGS[  
 return bRemoved; NY3.?@Z  
} "1HKD  
qe<aJn  
void VerifyWindow() ^M6R l0  
{ % "CF-K@th  
 for(int i=0;i<MAX_KEY;i++){ f'?FYBL  
  if(hCallWnd!=NULL){ *9O@DF&*6  
   if(!IsWindow(hCallWnd)){ <b#1L  
    hCallWnd=NULL; @Z2^smf  
    HotKey=0; o4F(X0  
    HotKeyMask=0; ALXie86a8  
    KeyCount--; 7w51UmO  
   } P}8cSX9  
  } ~ NZC0&  
 } s_}q  
} >7,?X_:A-1  
5-?*Boi>i  
BOOL CHookApp::InitInstance() My<.^~  
{ 2D)B%nM[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'B yB1NL  
 hins=AfxGetInstanceHandle(); #bCQEhCy  
 InitHotkey(); 1=z6m7@'-  
 return CWinApp::InitInstance(); 4U>g0  
} ^bk:g}o  
Fv$oXg/  
int CHookApp::ExitInstance() :erfs}I  
{ MmQ"z_v  
 VerifyWindow(); 7 F> a&r  
 UnInit(); K;j0cxl  
 return CWinApp::ExitInstance(); ,4--3 MU  
} GW,RE\Q:  
<\`qRz0/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "el}9OitC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~1:_w ni  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^2C \--=;  
#if _MSC_VER > 1000 yIYQ.-DkS+  
#pragma once MnTJFo"  
#endif // _MSC_VER > 1000 !q!5D`  
h,|. qfUk  
class CCaptureDlg : public CDialog >["X( %&w  
{ *b8AN3!  
 // Construction K(r@JW  
 public: c"lblt5  
  BOOL bTray; QERj`/g  
  BOOL bRegistered; w:aV2  
  BOOL RegisterHotkey(); A9Icn>3?`(  
  UCHAR cKey; F[KM0t!  
  UCHAR cMask; ftxy]N LF  
  void DeleteIcon(); `z$=J"%? y  
  void AddIcon(); O-&^;]ieJ  
  UINT nCount; %f5c,}  
  void SaveBmp(); >!MRk[@ V-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xSrjN  
  // Dialog Data 7:e5l19 uI  
  //{{AFX_DATA(CCaptureDlg) Y_nl9}&+C0  
  enum { IDD = IDD_CAPTURE_DIALOG }; GB4^ 4Ajx  
  CComboBox m_Key; B&m6N,  
  BOOL m_bControl; . ZP$,  
  BOOL m_bAlt; yT|44 D2j  
  BOOL m_bShift; N qS]dH61  
  CString m_Path; r;_*.|AH  
  CString m_Number; GBY{O2!3u  
  //}}AFX_DATA w8cbhc  
  // ClassWizard generated virtual function overrides 089v; d 6  
  //{{AFX_VIRTUAL(CCaptureDlg) 'U-8w@\Z  
 public: P!dSJ1'oC  
  virtual BOOL PreTranslateMessage(MSG* pMsg); b_f"(l8'S  
 protected: N\anjG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pi5DDK  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); SZvp %hS0  
  //}}AFX_VIRTUAL uCoy~kt292  
  // Implementation ny:/a  
 protected: RTr"#[  
  HICON m_hIcon; I]a [Ngj  
  // Generated message map functions t:"%d9]  
  //{{AFX_MSG(CCaptureDlg) P'^& SK  
  virtual BOOL OnInitDialog(); MM6PaD{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -"rANP-UI  
  afx_msg void OnPaint(); ^hcK&  
  afx_msg HCURSOR OnQueryDragIcon(); c#-*]6x  
  virtual void OnCancel(); &H[7UyC  
  afx_msg void OnAbout(); _Kbj?j  
  afx_msg void OnBrowse(); Ca -.&$f  
  afx_msg void OnChange(); 7(d#zu6n  
 //}}AFX_MSG *dN_=32u  
 DECLARE_MESSAGE_MAP() KM?w{ ~9  
}; :7~DiH:Q  
#endif qM<CBcON  
6)c-s|#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file re4A5Ev$  
#include "stdafx.h" 3&6sQ-}*  
#include "Capture.h" "}vxHN#  
#include "CaptureDlg.h" 4~1lP&  
#include <windowsx.h> 6^lix9q7  
#pragma comment(lib,"hook.lib") 0?cJ>)N  
#ifdef _DEBUG $,B;\PX  
#define new DEBUG_NEW .FN 6/N\  
#undef THIS_FILE W ", yq|  
static char THIS_FILE[] = __FILE__; b=5ZfhIg[  
#endif ~n$\[rQ  
#define IDM_SHELL WM_USER+1 Ehxu`>@N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :D4'x{#H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nk;^sq4M:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; a$\ Bt_  
class CAboutDlg : public CDialog H@b4(6  
{ nok-![  
 public: "'C5B>qO  
  CAboutDlg(); 9h/Hy aN  
  // Dialog Data .>Qa3,v5  
  //{{AFX_DATA(CAboutDlg) c dWg_WBC  
  enum { IDD = IDD_ABOUTBOX }; r'4Dj&9Ac  
  //}}AFX_DATA Ww"]3  
  // ClassWizard generated virtual function overrides qeb}~FL"o  
  //{{AFX_VIRTUAL(CAboutDlg) C-\3,  
 protected: xIwILY|W=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O`5hj q#  
  //}}AFX_VIRTUAL p[ &b@U#  
  // Implementation oJQ \?~  
 protected: z;MPp#Y  
  //{{AFX_MSG(CAboutDlg) D8{ ,}@  
  //}}AFX_MSG 5WvsS( 9H  
  DECLARE_MESSAGE_MAP() )7p(htCz5  
}; ^#IE t#  
Wt=\hixj-  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |AT`(71  
{ ;/t~MH  
 //{{AFX_DATA_INIT(CAboutDlg) %w?C)$Kn\  
 //}}AFX_DATA_INIT 4Y1dkg1y  
} ZtmaV27s/  
'Yi="kno  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !^o{}*]Pi  
{  56MY@  
 CDialog::DoDataExchange(pDX); YrYmPSb=  
 //{{AFX_DATA_MAP(CAboutDlg) *(qj!U43  
 //}}AFX_DATA_MAP zXU g(xu  
} @vB-.XU  
pRzL}-[/v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) nM ?Nf}  
 //{{AFX_MSG_MAP(CAboutDlg) Lz!JLiMEET  
 // No message handlers @|5B}%!  
 //}}AFX_MSG_MAP ioEjbqD<  
END_MESSAGE_MAP() ?^2nrh,n+  
q!W=U8`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) hC9EL= A  
: CDialog(CCaptureDlg::IDD, pParent) M6bM`wHH>  
{ '1(6@5tyWk  
 //{{AFX_DATA_INIT(CCaptureDlg) mHV{9J  
  m_bControl = FALSE; R:3=!zav  
  m_bAlt = FALSE; IRueq @4  
  m_bShift = FALSE; g5RH:]DV  
  m_Path = _T("c:\\"); KMK8jJ  
  m_Number = _T("0 picture captured."); |f/Uzd ~  
  nCount=0; VN (*m(b  
  bRegistered=FALSE; J_fs}Y1q\  
  bTray=FALSE; Pd-LDs+Ga  
 //}}AFX_DATA_INIT `HO] kJpX  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s 0_*^cZ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (> _Lb  
} |rG)Q0H,  
!dUdz7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 00{a }@n  
{ B:Ft(,  
 CDialog::DoDataExchange(pDX); a 9{:ot8,  
 //{{AFX_DATA_MAP(CCaptureDlg) _aBy>=2c$  
  DDX_Control(pDX, IDC_KEY, m_Key); u! &T}i:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5423Ky<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ijUu{PG`X  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); tTF<DD}8  
  DDX_Text(pDX, IDC_PATH, m_Path); <h;_:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `<g6^P  
 //}}AFX_DATA_MAP k14<E /  
} F" M  
.ZV='i()X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j S[#R_  
//{{AFX_MSG_MAP(CCaptureDlg) fVf:voh  
 ON_WM_SYSCOMMAND() 9D Nd} rXO  
 ON_WM_PAINT() (wuciKQ  
 ON_WM_QUERYDRAGICON() p*)I QM<B  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) c~O Lr  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TUz4-Pd  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9_nbMs   
//}}AFX_MSG_MAP '=%`;?j  
END_MESSAGE_MAP() vm{8x o  
+2}cR66%  
BOOL CCaptureDlg::OnInitDialog() [ZC\8tP`V  
{ 93:oXyFjD  
 CDialog::OnInitDialog(); G;iH.rCH  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); TET=>6  
 ASSERT(IDM_ABOUTBOX < 0xF000); lM}-'8tt?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); iF":c}$.  
 if (pSysMenu != NULL) /H"fycZ  
 { )Tp"l"(G  
  CString strAboutMenu; F'sX ^/;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]uMZvAjb  
  if (!strAboutMenu.IsEmpty()) Yh!=mW!OY  
  { Dr(2@ 0P  
   pSysMenu->AppendMenu(MF_SEPARATOR); MG~Z)+g=y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _p5#`-%mM  
  } >j3':>\U  
 } 7}y@VO6]  
 SetIcon(m_hIcon, TRUE); // Set big icon 6wj o:I  
 SetIcon(m_hIcon, FALSE); // Set small icon u$C\#y7  
 m_Key.SetCurSel(0); ]1XtV<  
 RegisterHotkey(); J*MH`;-  
 CMenu* pMenu=GetSystemMenu(FALSE); ]s\vc:cc?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c61OT@dZEA  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `/`iLso& -  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); aL*MCgb'  
 return TRUE; // return TRUE unless you set the focus to a control [Eccj`\e g  
} ep?D;g  
U._fb=  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) W]DGt|JP  
{ yg H)U.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /} z9(  
 { F'OO{nF  
  CAboutDlg dlgAbout; o $W@@aM  
  dlgAbout.DoModal(); cTzR<Yr  
 } ?upd  
 else t-o,iaPG3  
 { t&Eiz H$  
  CDialog::OnSysCommand(nID, lParam); .r{t&HO;Y  
 } yYYP;N?g4k  
} ib#rT{e  
0%%U7GFB5  
void CCaptureDlg::OnPaint() 2>o^@4PnZ  
{ nDO7  
 if (IsIconic()) K-)!d$$   
 { D_0sXIbg  
  CPaintDC dc(this); // device context for painting ybqmPT'|_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )W>$_QxbN  
  // Center icon in client rectangle =0] K(p,  
  int cxIcon = GetSystemMetrics(SM_CXICON); y6tqemz  
  int cyIcon = GetSystemMetrics(SM_CYICON); yP"}(!~m  
  CRect rect; |;xEK nF  
  GetClientRect(&rect); JbL3/h]  
  int x = (rect.Width() - cxIcon + 1) / 2; Dy,MQIM|!  
  int y = (rect.Height() - cyIcon + 1) / 2; 8s2y!pn7Q  
  // Draw the icon U5wh( vi  
  dc.DrawIcon(x, y, m_hIcon); O/FI>RT\H  
 } Gf3-%s xA  
 else :wXiz`VH  
 { #::+# G  
  CDialog::OnPaint(); 6H: fg  
 } ,b -  
} Anu:  
7gN;9pc$  
HCURSOR CCaptureDlg::OnQueryDragIcon() pZopdEFDK|  
{ m(MQ  
 return (HCURSOR) m_hIcon; ar\|D\0V  
} d/j?.\  
q4w]9b/  
void CCaptureDlg::OnCancel() p+|8(w9A${  
{ `ovMfL.u  
 if(bTray) JygJ4RI%j  
  DeleteIcon(); {l!{b1KJ  
  CDialog::OnCancel(); j0~am,yZ  
} jT$J~M pHh  
6xtgnl#T  
void CCaptureDlg::OnAbout() uA[ :  
{ TP {\V>*Yz  
 CAboutDlg dlg; CEkUXsp  
 dlg.DoModal(); KYw7Jx`l  
} 4-SU\_  
Pg:xC9w4  
void CCaptureDlg::OnBrowse() &z40l['4bz  
{ 0$c(<+D  
 CString str; e ar:`11z  
 BROWSEINFO bi; U)Hc 7% e  
 char name[MAX_PATH]; X>yDj]*4P  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )Jk$j  
 bi.hwndOwner=GetSafeHwnd(); #<"od'{U  
 bi.pszDisplayName=name; n nAtXVy  
 bi.lpszTitle="Select folder"; 035jU'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; keRLai7h  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y)F(-H)  
 if(idl==NULL) \ui'~n_t]  
  return; ,'HjL:r  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RHn3\N  
 str.ReleaseBuffer(); *(1 <J2j  
 m_Path=str; -*KKrte  
 if(str.GetAt(str.GetLength()-1)!='\\') $%\6"P/64  
  m_Path+="\\"; qMVuFw Phi  
 UpdateData(FALSE); yOQae m^O  
} gAorb\iJ  
iYvzZ7 8f  
void CCaptureDlg::SaveBmp() %m f)BC  
{ C.:S@{sK  
 CDC dc; M^Z=~512g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !KOa'Ic$V  
 CBitmap bm; G4 :\6fu  
 int Width=GetSystemMetrics(SM_CXSCREEN); z"yW):X  
 int Height=GetSystemMetrics(SM_CYSCREEN); mOh?cjOi  
 bm.CreateCompatibleBitmap(&dc,Width,Height); aWJ BYw6{L  
 CDC tdc; PkyX,mr#1  
 tdc.CreateCompatibleDC(&dc); c}n66qJF5  
 CBitmap*pOld=tdc.SelectObject(&bm); OYt_i'Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4hxP`!<  
 tdc.SelectObject(pOld); S-o )d  
 BITMAP btm; P HOngn  
 bm.GetBitmap(&btm); { "Cu)AFy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .rO~a.kG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FWW@t1)  
 BITMAPINFOHEADER bih; /iM1   
 bih.biBitCount=btm.bmBitsPixel; G \MeJSt*  
 bih.biClrImportant=0; K;"oK  
 bih.biClrUsed=0;  0LL65[  
 bih.biCompression=0; 2;"vF9WMm  
 bih.biHeight=btm.bmHeight; 8%u|[Si;  
 bih.biPlanes=1; $`7Fk%#+e  
 bih.biSize=sizeof(BITMAPINFOHEADER); ysK J=  
 bih.biSizeImage=size; GB}\7a  
 bih.biWidth=btm.bmWidth; ibZ[U p?  
 bih.biXPelsPerMeter=0; 1G12FV>M  
 bih.biYPelsPerMeter=0; @fmp2!?6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); i0wBZ i?  
 static int filecount=0; /cx'(AT  
 CString name; u9v,B$ S  
 name.Format("pict%04d.bmp",filecount++); zLe(#8G  
 name=m_Path+name; 2>^(&95M  
 BITMAPFILEHEADER bfh; wM N;<  
 bfh.bfReserved1=bfh.bfReserved2=0; CQ.C{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e8dZR3JL  
 bfh.bfSize=54+size; ^&86VBP  
 bfh.bfOffBits=54; v\8v'EDP  
 CFile bf; ^.)0O3oC  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tlD^"eq4:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5<`83; R9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qzvht4  
  bf.WriteHuge(lpData,size); QeFt WjlqC  
  bf.Close(); FO[ s;dmzu  
  nCount++; 4Ol1T(J#  
 } Hs8JJGXWB  
 GlobalFreePtr(lpData); 3=oxT6"k  
 if(nCount==1) fA<os+*9i  
  m_Number.Format("%d picture captured.",nCount); [Q8Wy/o Q  
 else H'udxPF  
  m_Number.Format("%d pictures captured.",nCount); hM!g6\ w  
  UpdateData(FALSE); zj2y=A| Y  
} !m~r0M7  
%pOxt<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9#1?Pt^{<  
{ s 7w A3|9  
 if(pMsg -> message == WM_KEYDOWN) HU/4K7e`  
 { bXOM=T  
  if(pMsg -> wParam == VK_ESCAPE) {aV,h@>  
   return TRUE; >6&Rytcc]  
  if(pMsg -> wParam == VK_RETURN) $Bc3| `K1v  
   return TRUE; V >eG\  
 } b|k^   
 return CDialog::PreTranslateMessage(pMsg); #W/Ch"Kv  
} <m~8pM  
XX90 Is  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X,G"#j^  
{ ^4 ,LIIUj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !mqIq} h  
  SaveBmp(); P(I%9  
  return FALSE; Ws2?sn#x  
} vs+aUT C\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^CQp5kp]  
 CMenu pop; `5oXf  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2i #Ekon  
 CMenu*pMenu=pop.GetSubMenu(0); ?o6#i3k#'  
 pMenu->SetDefaultItem(ID_EXITICON); eB9&HD:  
 CPoint pt; zBq&/?  
 GetCursorPos(&pt); A7#nBHwxZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ucz~y! 4L{  
 if(id==ID_EXITICON) vJi<PQ6  
  DeleteIcon(); A =Z$H2  
 else if(id==ID_EXIT) ztHx) !  
  OnCancel(); }BT0dKx  
 return FALSE; ](n)bF+ym  
} !PeSnO  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qhTVsZ:{C  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) XABP}|aWK  
 AddIcon(); VuTTWBx  
 return res; HbPn<x^7  
} 6hR ` sE  
C7W<7DBf  
void CCaptureDlg::AddIcon() <3j`Z1J  
{ c+z [4"rYL  
 NOTIFYICONDATA data; M~`^deU1  
 data.cbSize=sizeof(NOTIFYICONDATA); IIGx+>  
 CString tip; \Ezcr=0z{j  
 tip.LoadString(IDS_ICONTIP); 3:#6/@wQ  
 data.hIcon=GetIcon(0); sqV~ Dw  
 data.hWnd=GetSafeHwnd(); hg<[@Q%$o  
 strcpy(data.szTip,tip); BUsxgs"),  
 data.uCallbackMessage=IDM_SHELL; iyR"O1]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; {0+WVZ4u  
 data.uID=98; pQc-}o"  
 Shell_NotifyIcon(NIM_ADD,&data); {"$ [MYi:  
 ShowWindow(SW_HIDE); CGK]i. N  
 bTray=TRUE; { Dm@_&  
} $.w$x1  
C,mfA%63  
void CCaptureDlg::DeleteIcon() ..BP-N)V)  
{ yDZm)|<.  
 NOTIFYICONDATA data; sz/^Ie-~  
 data.cbSize=sizeof(NOTIFYICONDATA); p{ZyC  
 data.hWnd=GetSafeHwnd(); 9(!AKKrr;  
 data.uID=98; X}x\n\Z  
 Shell_NotifyIcon(NIM_DELETE,&data); ]n"RPktx  
 ShowWindow(SW_SHOW); e9/Mjq\  
 SetForegroundWindow(); .I#_~C'\  
 ShowWindow(SW_SHOWNORMAL);  W{Z 7=  
 bTray=FALSE; GNrRc3dr$  
} bd}[X'4d  
H n]( )/  
void CCaptureDlg::OnChange() /joY? T  
{ za 7+xF  
 RegisterHotkey(); h*1T3U$  
} \ %MsG  
[YODyf}M>\  
BOOL CCaptureDlg::RegisterHotkey() -L6CEe  
{ T2rBH]5  
 UpdateData(); iV#A-9  
 UCHAR mask=0; [\h?mlG?  
 UCHAR key=0; PP!-*~F0Jr  
 if(m_bControl) I#;dS!W"'  
  mask|=4; [ "3s  
 if(m_bAlt) .Oc j|A6  
  mask|=2; %*Mr ^=  
 if(m_bShift) :IJ<Mmb  
  mask|=1; |`o1B;lc  
  key=Key_Table[m_Key.GetCurSel()]; w8UUeF  
 if(bRegistered){ t18j2P>`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); EVaHb;  
  bRegistered=FALSE; K*,,j\Q.  
 } ),Yk53G6c  
 cMask=mask; P?|\Ig1Gk  
 cKey=key; gzat!>*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); , #GB  
 return bRegistered; "zXrfn  
} {n|Uf 5  
UmGKj9u  
  四、小结 p"jze3mF  
i_r708ep6  
  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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