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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: Bi e?M  
  Y}ng_c  
  一、实现方法 );nz4/V  
N31?9GE  
  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: C\ vC?(n  
t9.,/o,  
#pragma data_seg("shareddata") j'+ELKQ  
HHOOK hHook =NULL; //钩子句柄 A t{U~^  
UINT nHookCount =0; //挂接的程序数目 :q^R `8;(t  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wa!zv^;N*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P+h6!=nD7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T|ZF/&XP  
static int KeyCount =0; :c y >c2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Q!yb16J  
#pragma data_seg() XYe~G@Q Z  
,yICNtP  
  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。 /}Yqf`CZy  
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  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: \eQ la8s  
vQ 4}WtvA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |zq4*  5  
cKey,UCHAR cMask) Z?17Pu'Dp  
{ 0#QKVZq2>  
 BOOL bAdded=FALSE; p%F8'2)}  
 for(int index=0;index<MAX_KEY;index++){ ;hwzYXWF  
  if(hCallWnd[index]==0){ 3cqQL!Gm  
   hCallWnd[index]=hWnd; i'HPRY  
   HotKey[index]=cKey; :[xvlW29  
   HotKeyMask[index]=cMask; F.<L> G7{1  
   bAdded=TRUE; bpW!iY/q3  
   KeyCount++; zOB !(R  
   break; pz 7H To;p  
  } I5qM.@%zB  
 } Pt)S;6j   
 return bAdded; ~wOTjz  
} %:3'4;jh%  
//删除热键 ?6f7ld5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9@n diu[  
{ d ",(a Z  
 BOOL bRemoved=FALSE; %x2 uP9  
 for(int index=0;index<MAX_KEY;index++){ n!G.At'JP  
  if(hCallWnd[index]==hWnd){ |O-`5_z$r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w9f _b3  
    hCallWnd[index]=NULL; hGI+:Js6  
    HotKey[index]=0; Q".g.k  
    HotKeyMask[index]=0; 7X}TB\N1  
    bRemoved=TRUE; BX[~% iE  
    KeyCount--; edijfhn  
    break; R,F gl2  
   } Vr/Bu4V"  
  } w2{g,A|  
 } D9BQID$R  
 return bRemoved; =A@>I0(7  
} qZ*f%L(  
+~Tu0?{Z 0  
ZIpD{>/  
  DLL中的钩子函数如下: q8>t!rh<R  
@TzvT3\q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #6=MKpR  
{ (wuaxo:  
 BOOL bProcessed=FALSE; *0y{ ~@  
 if(HC_ACTION==nCode) byGn,m  
 { qsI^oBD"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 S`m,S4-eD  
   switch(wParam) j13DJ.xu  
   {  R>2IRvY(  
    case VK_MENU: I{ ryD -!  
     MaskBits&=~ALTBIT; 6Ps.E  
     break; ?59'dGnz_  
    case VK_CONTROL: &gn-Wb?  
     MaskBits&=~CTRLBIT; "uKFOV?j&  
     break; Fi2xr<7"  
    case VK_SHIFT: sN~\+_  
     MaskBits&=~SHIFTBIT; $wV1*$1NM  
     break; +C+<BzR~A.  
    default: //judge the key and send message ez\eOH6  
     break; '\"G{jU@  
   } ?Ik4  
   for(int index=0;index<MAX_KEY;index++){ ~y /!fnv  
    if(hCallWnd[index]==NULL) V.6)0fKZW  
     continue; hJ*Ihwn|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ObG=>WPJa  
    { SV.z>p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s5D:  
     bProcessed=TRUE; UKtSm%\  
    } #HAC*n  
   } < Ek/8x  
  } $*f?&U]k  
  else if((lParam&0xc000ffff)==1){ //有键按下 0[T,O,y  
   switch(wParam) iWA|8$u4gm  
   { ; s|w{.<:  
    case VK_MENU: eC! #CK  
     MaskBits|=ALTBIT; c_.-b=zm  
     break; 4)kG-[#  
    case VK_CONTROL: w1 `QIv  
     MaskBits|=CTRLBIT; $f$|6jM  
     break; sy/nESZs  
    case VK_SHIFT: sOBu7!G%  
     MaskBits|=SHIFTBIT; f>polxB%N  
     break; K j3?ve~  
    default: //judge the key and send message ' cBBt  
     break; $ s-Y%gc  
   } uw AwWgl  
   for(int index=0;index<MAX_KEY;index++){ G[,Q95`w?<  
    if(hCallWnd[index]==NULL) X~oK[Nf'9  
     continue; S($Su7g%_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0 1V^L}  
    { iW%8/$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R=]d%L8  
     bProcessed=TRUE; x Q4%e[/  
    } u92^(|  
   } Hfym30  
  } N&,]^>^u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o!c] (  
   for(int index=0;index<MAX_KEY;index++){  ?K_ '@  
    if(hCallWnd[index]==NULL) p H@]Y+W  
     continue; ][&9]omB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LWfqEL -  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gl}Qxv#$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 r;&>iX4B  
   } U_B(( Z(g  
  } Yg9joNBh  
 } @? c2)0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *L4`$@l8  
} )h{ ]k=  
QDx$==Fo  
  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: )e|=mtp  
uXjP`/R|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); em{(4!W>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P{Lf5V9# <  
ocz G|_  
  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: !C4!LZ0A  
X;oa[!k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u #w29Pm  
{ (kv?33  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) G\de2Q"d:O  
 { r|u MovnV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N$>^g"6 o  
  SaveBmp(); aj^wRzJ}zA  
  return FALSE; P!G858V(  
 } <{5EdX  
 …… //其它处理及默认处理 _Q[$CcDEE  
} QX4ai3v  
ar9]"s+'  
;r[@v347  
  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。 HlvuW(,x=  
W2FD+ wt  
  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。 _tTNG2  
gKYfQ+  
  二、编程步骤 "ZM4F?x  
E_e6^Sk5B(  
  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"; . mLK`c6  
f y:,_#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; q@t0NvNSu  
)G^ KDj"  
  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; ",7Q   
*!s;"U  
  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; i.D3'l  
1i[FY?6`dh  
  5、 添加代码,编译运行程序。 nw>8GivO  
#9-P%%kQ  
三、程序代码 (0YZZ93  
SN7"7joP<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL InXn%9]p]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #txE=e"&o  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /+Lfrt  
#if _MSC_VER > 1000 Sz- J y:j  
#pragma once p2Zo  
#endif // _MSC_VER > 1000 WmY``  
#ifndef __AFXWIN_H__ ~cTN~<{dq  
#error include 'stdafx.h' before including this file for PCH +_XzmjnDd  
#endif 3RLFp\i"s  
#include "resource.h" // main symbols %LVm3e9  
class CHookApp : public CWinApp ;r_F[E2z  
{ Dn&D!B  
 public: #]nx!*JNZ  
  CHookApp(); =6"2UC&  
  // Overrides W`\R%>$H  
  // ClassWizard generated virtual function overrides C{gyj}5  
  //{{AFX_VIRTUAL(CHookApp) ?7<JQh)"e  
 public: Zjbc3 M5  
  virtual BOOL InitInstance(); 3)\8%Ox  
  virtual int ExitInstance(); =|3fs7  
  //}}AFX_VIRTUAL *%{gYpn  
  //{{AFX_MSG(CHookApp) KMI_zhyB  
  // NOTE - the ClassWizard will add and remove member functions here. 0"CG7Vg,zh  
  // DO NOT EDIT what you see in these blocks of generated code ! LaQ-=;(`  
  //}}AFX_MSG Ty vtmx M  
  DECLARE_MESSAGE_MAP() ?c[*:N(  
}; ,AxdCT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); QUu}Xg:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G:~k.1y[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nqInb:  
BOOL InitHotkey(); GGnpjwXeH  
BOOL UnInit(); \"X!2  
#endif bGc~Wr|  
C:PMewn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O3I8k\`  
#include "stdafx.h" :<}=e@/~|  
#include "hook.h" n4}B r;%  
#include <windowsx.h> ?b(=1S\E'^  
#ifdef _DEBUG ?VP8ycm  
#define new DEBUG_NEW N5a*7EJv+  
#undef THIS_FILE G6T_O  
static char THIS_FILE[] = __FILE__; xuqv6b.  
#endif a)wJT`xu  
#define MAX_KEY 100  ,%uo6%  
#define CTRLBIT 0x04 eeyHy"@  
#define ALTBIT 0x02 "?V0$-DR  
#define SHIFTBIT 0x01 |&RU/a  
#pragma data_seg("shareddata") &YF^j2  
HHOOK hHook =NULL; 1v71rf&w  
UINT nHookCount =0; Q_[ 3`j l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O^oWG&Y;v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT vQ;Ex  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey S:h{2{  
static int KeyCount =0; ~`aa5;Ab_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .Y&)4+ckL  
#pragma data_seg() |Y?H A&  
HINSTANCE hins; ;M)QwF1  
void VerifyWindow(); z6*X%6,8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) rJGf .qJJ  
//{{AFX_MSG_MAP(CHookApp) FoN|i"*l  
// NOTE - the ClassWizard will add and remove mapping macros here. ;lHr =e7  
// DO NOT EDIT what you see in these blocks of generated code! 0*f)=Q'  
//}}AFX_MSG_MAP ~_/(t'9  
END_MESSAGE_MAP() G"h'_7  
ZrsBm_Rx  
CHookApp::CHookApp() gt@m?w(  
{ wOU_*uY@6'  
 // TODO: add construction code here, C{U?0!^  
 // Place all significant initialization in InitInstance &5yV xL:  
} H{Wu]C<@p  
A~)D[CV  
CHookApp theApp; &litXIvT>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y*qVc E  
{ #d6)#:uss  
 BOOL bProcessed=FALSE; { \81i8b]  
 if(HC_ACTION==nCode) o]4*|ARPs  
 { ? m DI#~)  
  if((lParam&0xc0000000)==0xc0000000){// Key up E|iQc8gr&  
   switch(wParam) F(>Np2oi6  
   { 1*\o.  
    case VK_MENU: h2G$@8t}I  
     MaskBits&=~ALTBIT; Q+[n91ey**  
     break; YtmrRDQs  
    case VK_CONTROL: x(1:s|Uyp{  
     MaskBits&=~CTRLBIT; Fld=5B^}  
     break; AE[b},-[  
    case VK_SHIFT: JRB9rSN^  
     MaskBits&=~SHIFTBIT; l3)} qu  
     break; oKuI0-*mR  
    default: //judge the key and send message 4h|c<-`>t  
     break; k>;`FFQU>  
   } HiZ*+T.B  
   for(int index=0;index<MAX_KEY;index++){ G?O1>?4C  
    if(hCallWnd[index]==NULL) 6^]+[q}3  
     continue; !|^|,"A)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T&6l$1J  
    { 8A##\j )  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vS;RJg=  
     bProcessed=TRUE; %)1y AdG 8  
    } CsGx@\jN  
   } >;e~WF>+K  
  } ,E S0NA  
  else if((lParam&0xc000ffff)==1){ //Key down C5o#i*|  
   switch(wParam) >qnko9V  
   { Va"0>KX  
    case VK_MENU: <^#,_o,!  
     MaskBits|=ALTBIT; ;U/&I3dzV  
     break; t}r ' k/[  
    case VK_CONTROL: d,k!qjf=r  
     MaskBits|=CTRLBIT; hOjk3 k  
     break; oB(?_No7  
    case VK_SHIFT: cr7 }^s  
     MaskBits|=SHIFTBIT; _kef 0K6  
     break; ]L5@,E4.  
    default: //judge the key and send message =^M/{51j  
     break; L/$H"YOv  
   } %O|iE M  
   for(int index=0;index<MAX_KEY;index++) Ag-(5:  
   { , qMzWa  
    if(hCallWnd[index]==NULL) XO.jl"xu  
     continue; slCx w$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *#,7d"6W5  
    { n(1l}TJy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @LF,O}[2J  
     bProcessed=TRUE; D+lAhEN  
    } .s?L^Z^  
   } PxvyN_B#>  
  } L>jY.d2w=K  
  if(!bProcessed){ ]C!gQq2'a  
   for(int index=0;index<MAX_KEY;index++){ - YEZ]:"  
    if(hCallWnd[index]==NULL) ha]VWt%}  
     continue; ]E5o1eeg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xQ f*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BtkOnbz8X  
   } Ri<u/ ]oR"  
  } `V}q-Zdy  
 } X-bcQ@Oj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0yk]o5a++  
} |mZxfI  
0"jY.*_EW  
BOOL InitHotkey() W=~~5jFX  
{ ;AG8C#_  
 if(hHook!=NULL){ .]8ZwAs=&  
  nHookCount++; l{*@v=b(  
  return TRUE; 3#LlDC_WC  
 } %z=le7  
 else E>6MeO  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); zVViLUwG  
  if(hHook!=NULL) 5%Y3 Kwyy  
   nHookCount++; {&&z-^  
  return (hHook!=NULL); ?g_3 [Fk  
} W: z6Koc0  
BOOL UnInit() =Qy<GeY  
{ \j$&DCv   
 if(nHookCount>1){ G<L;4nA)  
  nHookCount--; yuh *  
  return TRUE; s:n6rG  
 } S\CCrje  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?qb}?&1  
 if(unhooked==TRUE){ (d(CT;  
  nHookCount=0; Amtq"<h9a  
  hHook=NULL; LQ@"Xe]5  
 } u+9hL4  
 return unhooked; k R?qb6  
} 0CHH)Bku  
5?f ^Rz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Akq2 d;  
{ Z%gh3  
 BOOL bAdded=FALSE; /!0={G  
 for(int index=0;index<MAX_KEY;index++){ d-oMQGOklb  
  if(hCallWnd[index]==0){ { a =#B)6  
   hCallWnd[index]=hWnd; ]vAz  
   HotKey[index]=cKey; t*p71U4+I  
   HotKeyMask[index]=cMask; tR# OjkvX  
   bAdded=TRUE; '+@=ILj>  
   KeyCount++; akmkyrz'&  
   break; $zUP?Gq!  
  } KqHyG  
 } J"0`%'*/  
 return bAdded; ?>VLTp8]  
} '6DBs8>1  
})'B<vq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Pd8![Z3  
{ 4j-Xi  
 BOOL bRemoved=FALSE; 4VHn  \  
 for(int index=0;index<MAX_KEY;index++){ R!HXhQ  
  if(hCallWnd[index]==hWnd){ N"Z{5A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T;4NRC  
    hCallWnd[index]=NULL; %[GsD9_-  
    HotKey[index]=0; |NlO7aQ>2H  
    HotKeyMask[index]=0; C2!|OQ9A2  
    bRemoved=TRUE; }H53~@WP>  
    KeyCount--; RTYvS5 G  
    break; ldf\;Qk  
   } hWjc<9  
  } [z:!j$K  
 } vz&|J   
 return bRemoved; #`^}PuQ  
} yNPVOp*  
"MeVE#O  
void VerifyWindow() ,KH#NY]  
{ I^.Om])  
 for(int i=0;i<MAX_KEY;i++){ !t"4!3  
  if(hCallWnd!=NULL){ Dm981t>wL  
   if(!IsWindow(hCallWnd)){ XPc^Tq  
    hCallWnd=NULL; (g]!J_Z"  
    HotKey=0; }{Pp]*I<A  
    HotKeyMask=0; n9\TO9N  
    KeyCount--; 2Ah#<k-gC;  
   } iqsCB%;5  
  } t 9lPb_70  
 } w7L{_aom  
} 70?\ugxA  
hPkp;a #  
BOOL CHookApp::InitInstance() b`Zx!^  
{ SO/c}vnBB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4> K42m  
 hins=AfxGetInstanceHandle(); &u."A3(  
 InitHotkey(); yX>K/68  
 return CWinApp::InitInstance(); yZY\MB/  
} gjyYCjF  
kt#fMd$  
int CHookApp::ExitInstance() P}}* Q7P  
{ 0D.Mke )  
 VerifyWindow(); fUWG*o9  
 UnInit(); XSB"{H>&  
 return CWinApp::ExitInstance(); BKCiIfkZ  
} ,_ H:J.ik  
v4TQX<0s  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :LQYo'@yB  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {lzWrUGO  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @D[_}JE  
#if _MSC_VER > 1000 /KaZH R.  
#pragma once J[|y:N  
#endif // _MSC_VER > 1000 /{J4:N'B>  
z|J_b"u4  
class CCaptureDlg : public CDialog R_cA:3qc~  
{ /U*C\ xMm  
 // Construction X,% 0/6*]  
 public: M] %?>G  
  BOOL bTray; }-{H  Y  
  BOOL bRegistered; e2Pcm_Ahv*  
  BOOL RegisterHotkey(); m])y.T  
  UCHAR cKey; &m7]v,&  
  UCHAR cMask; ~vhE|f  
  void DeleteIcon(); H2 {+)  
  void AddIcon(); SHxNr(wJ<Q  
  UINT nCount; 6Pnjmw.HV  
  void SaveBmp(); H|<[YYk  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !-x$L>1$  
  // Dialog Data :pY/-Cgv  
  //{{AFX_DATA(CCaptureDlg) \:'/'^=#|  
  enum { IDD = IDD_CAPTURE_DIALOG }; #Vt%@* i  
  CComboBox m_Key; O6 3<AY@  
  BOOL m_bControl; .VJMz4$]O  
  BOOL m_bAlt; HWrO"b*tO  
  BOOL m_bShift; i# /Jr=  
  CString m_Path; d"mkL-  
  CString m_Number; 6'57  
  //}}AFX_DATA X7 MM2V  
  // ClassWizard generated virtual function overrides gfd"v  
  //{{AFX_VIRTUAL(CCaptureDlg) %XDc,AR[  
 public: myQagqRx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2;`1h[,-^  
 protected: dq6m>;`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AT 3cc  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z, )6"/;  
  //}}AFX_VIRTUAL ^zmG0EH,  
  // Implementation jD]~ AwRJ  
 protected: ZY={8T@  
  HICON m_hIcon; ^ogt+6c  
  // Generated message map functions bHYy}weZ  
  //{{AFX_MSG(CCaptureDlg) D,*3w'X!K  
  virtual BOOL OnInitDialog(); (zYt NLoFx  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bdrg(d6  
  afx_msg void OnPaint(); K(rWNO  
  afx_msg HCURSOR OnQueryDragIcon(); TDKki(o=~  
  virtual void OnCancel(); !u[9a;Sa#  
  afx_msg void OnAbout(); %6,SKg p  
  afx_msg void OnBrowse(); k68T`Ub\W6  
  afx_msg void OnChange(); W ]1)zO  
 //}}AFX_MSG X1|njJGO1  
 DECLARE_MESSAGE_MAP() Ecefi pG  
}; Tya1/w4  
#endif ) 1f~ dR88  
py!|\00}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~d4 )/y  
#include "stdafx.h" QB uMJm  
#include "Capture.h" +b<FO+E_  
#include "CaptureDlg.h" bKY7/w<dP  
#include <windowsx.h> L|:`^M+^w  
#pragma comment(lib,"hook.lib") *[Tz![|  
#ifdef _DEBUG u#$]?($}d  
#define new DEBUG_NEW W=><)miQ@  
#undef THIS_FILE KIf dafRL  
static char THIS_FILE[] = __FILE__; w^|*m/h|@u  
#endif SCHP L.n  
#define IDM_SHELL WM_USER+1 )e+>w=t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O)*+="Rg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @/.;Xw]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3>AMII  
class CAboutDlg : public CDialog _Xc8Yg }`  
{ ]"hFC<w  
 public: Vpz\.]  
  CAboutDlg(); gnOt+W8  
  // Dialog Data =JEv,ZGT3  
  //{{AFX_DATA(CAboutDlg) ^R7lom.  
  enum { IDD = IDD_ABOUTBOX }; >V?eog%~  
  //}}AFX_DATA ?%-DfCS  
  // ClassWizard generated virtual function overrides D9=KXo^  
  //{{AFX_VIRTUAL(CAboutDlg) dO<ERY  
 protected: IqaT?+O\?r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  4iazNl#  
  //}}AFX_VIRTUAL t;}|tgC  
  // Implementation {j?FNOJn  
 protected: zm5]J  
  //{{AFX_MSG(CAboutDlg) KE5kOU;  
  //}}AFX_MSG iAEbu&XG  
  DECLARE_MESSAGE_MAP() EReZkvseC  
}; M#4p E_G  
RUnSCOdX  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) TOB-aAO  
{ yiXSYD  
 //{{AFX_DATA_INIT(CAboutDlg) \O3m9,a   
 //}}AFX_DATA_INIT ;;OAQ`  
} ~S"+S/z/k  
.PIL +x*]N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ArI2wM/v  
{ a od-3"7[  
 CDialog::DoDataExchange(pDX); 3</_c1~  
 //{{AFX_DATA_MAP(CAboutDlg) [2!w_Iw'  
 //}}AFX_DATA_MAP u"cV%(#  
} *eTqVG.  
X"|['t  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) '6iEMg&3  
 //{{AFX_MSG_MAP(CAboutDlg) P6'1.R  
 // No message handlers jjB~G^n  
 //}}AFX_MSG_MAP h,u, ^ r  
END_MESSAGE_MAP() PB\(=  
B[Ku\A6&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gZ3u=uME  
: CDialog(CCaptureDlg::IDD, pParent) Xv5wJlc!d  
{ Ct<udO  
 //{{AFX_DATA_INIT(CCaptureDlg) _/s$ZCd  
  m_bControl = FALSE; /$xU  
  m_bAlt = FALSE; P:K5",)  
  m_bShift = FALSE; ~rqCN,=d  
  m_Path = _T("c:\\"); urs,34h  
  m_Number = _T("0 picture captured."); .LnGL]/  
  nCount=0; B:yGS*.tu  
  bRegistered=FALSE; ;s= l52  
  bTray=FALSE; rK6l8)o  
 //}}AFX_DATA_INIT i4Q@K,$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O'p9u@kc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5,lEx1{_  
} hP%M?MKC  
y{B=-\O]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a8e6H30Sm  
{ T9E+\D  
 CDialog::DoDataExchange(pDX); Tj` ,Z5vy  
 //{{AFX_DATA_MAP(CCaptureDlg) w,p PYf/t  
  DDX_Control(pDX, IDC_KEY, m_Key); >-RQ]?^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~OYiq}g  
  DDX_Check(pDX, IDC_ALT, m_bAlt); x*\Y)9Vgy  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }#RakV4  
  DDX_Text(pDX, IDC_PATH, m_Path); av8B-GQI*#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Hh3X \  
 //}}AFX_DATA_MAP A7Cm5>Y_S  
} kYP#SH/  
y4 #>X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }z'8Bu  
//{{AFX_MSG_MAP(CCaptureDlg) j;+b0(53  
 ON_WM_SYSCOMMAND() $lfn(b,  
 ON_WM_PAINT() $ZhF h{DQ.  
 ON_WM_QUERYDRAGICON() b4%??"&<Y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !3c\NbU  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w_"E*9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ONB{_X?  
//}}AFX_MSG_MAP @ p9i  
END_MESSAGE_MAP() )Yh+c=6 ?  
gS!:+G%  
BOOL CCaptureDlg::OnInitDialog() t9GR69v:?  
{ @muRxi  
 CDialog::OnInitDialog(); ehGLk7@7&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); HYD'.uj  
 ASSERT(IDM_ABOUTBOX < 0xF000); htO +z7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Y!aSs3c  
 if (pSysMenu != NULL) >NGj =L<  
 { <[a=ceL]|  
  CString strAboutMenu; r!|6:G+Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); WH#1 zv  
  if (!strAboutMenu.IsEmpty()) > ym,{EHK  
  { rQ{7j!Im  
   pSysMenu->AppendMenu(MF_SEPARATOR); )` SrfGp8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Hp|kQJ[LE  
  } b"<liGh"n-  
 } #X+JHl  
 SetIcon(m_hIcon, TRUE); // Set big icon W@M:a  
 SetIcon(m_hIcon, FALSE); // Set small icon 5 Aw"B  
 m_Key.SetCurSel(0); ;RZ )  
 RegisterHotkey(); Di,^%  
 CMenu* pMenu=GetSystemMenu(FALSE); P8OaoPj  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :_`F{rDB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \S `:y?[Y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /wGM#sFH  
 return TRUE; // return TRUE unless you set the focus to a control '|6]_   
} @(EAq<5{  
1SQ3-WU s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h6L&\~pf  
{ t4."/ .=+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9R!atPz9  
 { 1 fp?  
  CAboutDlg dlgAbout; //up5R_nx  
  dlgAbout.DoModal(); kYE9M8s;  
 } >4x(e\B  
 else { T/[cu<  
 { OR P\b  
  CDialog::OnSysCommand(nID, lParam); nmee 'oEw  
 } \Gef \   
} Y,qI@n<  
hk;5w{t}}  
void CCaptureDlg::OnPaint() v4a8}G  
{ Q^P}\wb>  
 if (IsIconic()) ydEoC$?0  
 { )rIwqUgp6\  
  CPaintDC dc(this); // device context for painting v4!VrI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); % "i(K@  
  // Center icon in client rectangle d(ZO6Nr Q  
  int cxIcon = GetSystemMetrics(SM_CXICON); &N$<e(K  
  int cyIcon = GetSystemMetrics(SM_CYICON); z#9aP&8Q  
  CRect rect;  h},IF  
  GetClientRect(&rect);  Po+.&7F  
  int x = (rect.Width() - cxIcon + 1) / 2; X;+sUj8  
  int y = (rect.Height() - cyIcon + 1) / 2; %_H<:uGO%  
  // Draw the icon a K[&V't~  
  dc.DrawIcon(x, y, m_hIcon); wA ,6bj  
 } *xAqnk   
 else ~f2z]JLr:  
 { x`eo"5.$  
  CDialog::OnPaint(); 1 &jc/*Z"  
 } M/B_#yK  
} RXMISt3+{y  
/aCc17>2V{  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8L=HW G!1  
{ YR\faVk  
 return (HCURSOR) m_hIcon; l K{hVqpt  
} olB.*#gA  
o+iiST JEe  
void CCaptureDlg::OnCancel() .D"m@~j7  
{ ~Y[r`]X`"m  
 if(bTray) Df-DRi  
  DeleteIcon(); /obfw^  
  CDialog::OnCancel(); a@K%06A;'  
} R`5.[?Dt  
4d4ZT?V[  
void CCaptureDlg::OnAbout() ;J( 8 L  
{ V;VHv=9`o  
 CAboutDlg dlg; LtF,kAIt7v  
 dlg.DoModal(); 4/~E4"8  
} gT{Q#C2Baw  
x M/+L:_<  
void CCaptureDlg::OnBrowse() Ys9[5@7  
{ #b}Z`u?@  
 CString str; _IHV7*u{;  
 BROWSEINFO bi; :1Xz4wkWS*  
 char name[MAX_PATH]; aH(J,XY  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,Q$ q=E;X  
 bi.hwndOwner=GetSafeHwnd(); wYXQlxdy  
 bi.pszDisplayName=name; :wyno#8`-  
 bi.lpszTitle="Select folder"; Vi$~-6n&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "m$##X\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); UBU=9a5  
 if(idl==NULL) tyDU @M  
  return; h|9L5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  R Z?jJm$  
 str.ReleaseBuffer(); \[i1JG  
 m_Path=str; 8mrUotjS  
 if(str.GetAt(str.GetLength()-1)!='\\') 9 RgVK{F  
  m_Path+="\\"; 6dr%;Wp  
 UpdateData(FALSE); PcMD])Z{G  
} y3Qsv  
St9?RD{4;  
void CCaptureDlg::SaveBmp() !x=~g"d<&  
{ QD&`^(X1p  
 CDC dc; u(.e8~s8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); @Sn(lnlB  
 CBitmap bm; &{n.]]%O.  
 int Width=GetSystemMetrics(SM_CXSCREEN); Lz Kj=5'Y  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?#G$=4;i  
 bm.CreateCompatibleBitmap(&dc,Width,Height); a 7 V-C  
 CDC tdc; 2DDtu[}  
 tdc.CreateCompatibleDC(&dc); 'W^YM@  
 CBitmap*pOld=tdc.SelectObject(&bm); .k%72ez  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,.8KN<A2]'  
 tdc.SelectObject(pOld); vzAaxk%  
 BITMAP btm; epe)a  
 bm.GetBitmap(&btm); oUlY?x1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @ CL{D:d  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y;M|D'y+  
 BITMAPINFOHEADER bih; SYJD?&C;  
 bih.biBitCount=btm.bmBitsPixel; BsDn5\ q  
 bih.biClrImportant=0; [ -K&R  
 bih.biClrUsed=0; ^ig' bw+WS  
 bih.biCompression=0; h 0Q5-EA  
 bih.biHeight=btm.bmHeight; .o^l z 9:  
 bih.biPlanes=1; e\l7Iu  
 bih.biSize=sizeof(BITMAPINFOHEADER); UYJZYP%r  
 bih.biSizeImage=size; 13=AW  
 bih.biWidth=btm.bmWidth; kd(8I_i@  
 bih.biXPelsPerMeter=0; O"9\5(w  
 bih.biYPelsPerMeter=0; oxA<VWUNT  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zT]8KA   
 static int filecount=0; Af2( 5]  
 CString name; e{K 215  
 name.Format("pict%04d.bmp",filecount++); ;7V%#-  
 name=m_Path+name; 7t0=[i  
 BITMAPFILEHEADER bfh; bl;1i@Z*M  
 bfh.bfReserved1=bfh.bfReserved2=0; Z]Cq3~l  
 bfh.bfType=((WORD)('M'<< 8)|'B'); I-*S&SiXjI  
 bfh.bfSize=54+size; #&aqKV Y  
 bfh.bfOffBits=54; 3z?> j]  
 CFile bf;  skViMo  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n5NsmVW\x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hd<c&7|G'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }@+0/W?\.  
  bf.WriteHuge(lpData,size); YnAm{YyI  
  bf.Close(); !9r$e99R  
  nCount++; $k%2J9O  
 } 7(8;t o6(  
 GlobalFreePtr(lpData); BC.87Fji/  
 if(nCount==1) _C?hHWSf"  
  m_Number.Format("%d picture captured.",nCount); 9~XA q^e  
 else hx%v+/  
  m_Number.Format("%d pictures captured.",nCount); Rtl"Ub@HV  
  UpdateData(FALSE); (m/G(wg  
} `(V3:F("@  
q"J]%zO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) sIGMA$EK  
{ S`0(*A[W*  
 if(pMsg -> message == WM_KEYDOWN) u|TeE\0  
 { %T%sGDCV  
  if(pMsg -> wParam == VK_ESCAPE) IfAZn_  
   return TRUE; 9}<ile7^  
  if(pMsg -> wParam == VK_RETURN) <0&*9ZeD  
   return TRUE;  "Og7rl  
 } 06Sceq  
 return CDialog::PreTranslateMessage(pMsg); .j0$J\:i  
} ChPmX+.i_  
vMH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :q% M_  
{ #rfiD%c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ WlC:l  
  SaveBmp(); f+,qNvBY/  
  return FALSE; [!#L6&:a8  
} w-MCZwCr)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ X51:  
 CMenu pop; Fj3a.'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /]Md~=yNp  
 CMenu*pMenu=pop.GetSubMenu(0); h2]P]@nW;W  
 pMenu->SetDefaultItem(ID_EXITICON); xj;H&swo  
 CPoint pt; !ons]^km  
 GetCursorPos(&pt); MaQqs=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :>f )g  
 if(id==ID_EXITICON) @,7GaK\  
  DeleteIcon(); FbFPJ !fb  
 else if(id==ID_EXIT) 37.S\ gO]  
  OnCancel(); K;H&n1  
 return FALSE; f+)L#>Gl?  
} C1n>M}b  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 04P}-L,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rcG"o\g@+  
 AddIcon(); ,m|h<faZL  
 return res; u^I|T.w<r6  
} j-}O0~Jz  
}!.(n=idZ  
void CCaptureDlg::AddIcon() YZ8>OwQz2  
{ 0-Ku7<a  
 NOTIFYICONDATA data; O;jrCB  
 data.cbSize=sizeof(NOTIFYICONDATA); (vJNHY M  
 CString tip; yjJ5>cg  
 tip.LoadString(IDS_ICONTIP); @:vwb\azVD  
 data.hIcon=GetIcon(0); `kXs;T6&  
 data.hWnd=GetSafeHwnd(); ]Q3ADh  
 strcpy(data.szTip,tip); \?k'4rH  
 data.uCallbackMessage=IDM_SHELL; %XQ(fj>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -zeG1gr3  
 data.uID=98; Jk n>S#SZ  
 Shell_NotifyIcon(NIM_ADD,&data); G<J?"oQbRT  
 ShowWindow(SW_HIDE); =>v#4zFd  
 bTray=TRUE; !F'YDjTot  
} wc4{)qDE  
By4<2u38u  
void CCaptureDlg::DeleteIcon() '-XXo=>0MV  
{ s*]}QmRpr  
 NOTIFYICONDATA data; KRRdXx\~  
 data.cbSize=sizeof(NOTIFYICONDATA); qqY"*uJ'  
 data.hWnd=GetSafeHwnd(); oAeUvmh  
 data.uID=98; nMUw_7Y6  
 Shell_NotifyIcon(NIM_DELETE,&data); Fk7')?  
 ShowWindow(SW_SHOW); Am|%lj+1z  
 SetForegroundWindow(); aeM+ d`f  
 ShowWindow(SW_SHOWNORMAL); :tg)p+KB  
 bTray=FALSE; ?GR"FmB(  
} ZKTz ,  
;h  
void CCaptureDlg::OnChange() ;dgp+  
{ 7[XRd9a5(  
 RegisterHotkey(); -C]5>& W  
} >KhOz[Zg  
:':s@gqr  
BOOL CCaptureDlg::RegisterHotkey() 9qzHS~l  
{ WW~sNC\3`(  
 UpdateData(); p}~JgEE  
 UCHAR mask=0; 6O!2P  
 UCHAR key=0; i<Zc"v;  
 if(m_bControl) VjZ|$k  
  mask|=4; `b7t4d*  
 if(m_bAlt) }WXi$(@v  
  mask|=2; S_UIO.K  
 if(m_bShift) . 3T3E X|G  
  mask|=1; ( ^Nz9{  
  key=Key_Table[m_Key.GetCurSel()]; 5<Nx^D  
 if(bRegistered){ = m#?neop  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); `+:`_4  
  bRegistered=FALSE; &d^m 1  
 } S;#'M![8  
 cMask=mask; =dYqS[kJW  
 cKey=key; k,+0u/I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "J_9WUN  
 return bRegistered; M%P:n/j  
} >U27];}y  
-gX1-,dE  
  四、小结 $B5aje}i  
tFOhL9T  
  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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