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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^M (fC  
  #X@<U <R  
  一、实现方法 *_/eAi/WG  
Be>c)90bO_  
  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: pL}j ZTo  
aQ&8fteFR  
#pragma data_seg("shareddata") ok%a|Zz+]  
HHOOK hHook =NULL; //钩子句柄 $F@L$& ~  
UINT nHookCount =0; //挂接的程序数目 J%f=A1Q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?Y6la.bc{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N 1f~K.e\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .A"T086  
static int KeyCount =0; $:u7Dv}\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X:SzkkVl7  
#pragma data_seg() QV'3O|  
3w^J"O/T  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 9HNh*Gc=  
GkGC4*n  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: llaZP(pJ  
\|pK Z6*s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR U8QR*"GmT  
cKey,UCHAR cMask) X\p`pw$  
{ @[>+Dzn[6  
 BOOL bAdded=FALSE; iZ.&q 6  
 for(int index=0;index<MAX_KEY;index++){ 0 bPJEEd  
  if(hCallWnd[index]==0){ 3<)@ll  
   hCallWnd[index]=hWnd; ;!0.Kk 4  
   HotKey[index]=cKey; q(&^9"  
   HotKeyMask[index]=cMask; #}t 1   
   bAdded=TRUE; Ic{'H2~4,  
   KeyCount++; )Vg{Y [!  
   break; rq'##`H  
  } -@ UN]K  
 } =hugnX<9  
 return bAdded; iB}LnC:  
} liCCc;&B;  
//删除热键 @ yg| OA}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e"o6C\c  
{ "S B%02  
 BOOL bRemoved=FALSE; hk"9D<&i>b  
 for(int index=0;index<MAX_KEY;index++){ l?@MUsg+  
  if(hCallWnd[index]==hWnd){ N'eQ>2>O@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ - 5o<Q'(  
    hCallWnd[index]=NULL; o&hKg#nO83  
    HotKey[index]=0; H)j [eZP  
    HotKeyMask[index]=0; 5I)~4.U|,m  
    bRemoved=TRUE; f74%YY  
    KeyCount--; {m_A1D/_  
    break; >Bh)7>`3c  
   } r}_Lb.1]  
  } aeuf, #  
 } %?]{U($?  
 return bRemoved; )tN?: l  
} ?dJ/)3I%F  
]HJ{dcF  
gJFR1  
  DLL中的钩子函数如下: XI@6a9Uk  
w&wA >q>&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %jbJ6c  
{ 097Fvt=#  
 BOOL bProcessed=FALSE; 5';/@M  
 if(HC_ACTION==nCode)  Z;j/K  
 { gZ`32fB%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _XH4;uGg  
   switch(wParam) cS"f  
   {  x38SSzG:L  
    case VK_MENU: msA' 5>  
     MaskBits&=~ALTBIT; 'L>&ZgLy  
     break; ^[X|As2  
    case VK_CONTROL: h.4qlx|  
     MaskBits&=~CTRLBIT; L?=#*4t  
     break; 9]]!8_0=r  
    case VK_SHIFT: vh9kwJyT  
     MaskBits&=~SHIFTBIT; r.^0!(d  
     break; Cp .1/  
    default: //judge the key and send message -:)DX++  
     break; JwN}Jm  
   } 2x7(}+eD  
   for(int index=0;index<MAX_KEY;index++){ uI%N?  
    if(hCallWnd[index]==NULL) tyc8{t#Z  
     continue; Zw;$(="  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VqcBwJ!?p  
    { m.1LxM$8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a(PjcQ4dY  
     bProcessed=TRUE; 4mEzcwo'  
    } :.C+?$iuX  
   } "-G&=(  
  } Xtuhcdzu[  
  else if((lParam&0xc000ffff)==1){ //有键按下 bin6i2b  
   switch(wParam) T{_1c oL  
   { <T(s\N5B=  
    case VK_MENU: R'S c  
     MaskBits|=ALTBIT; :~\LOKf  
     break; GLo\q:5A  
    case VK_CONTROL: j`>?"1e@x  
     MaskBits|=CTRLBIT; Ty`-r5  
     break; 4a\n4KO X  
    case VK_SHIFT: Oamv9RyDvC  
     MaskBits|=SHIFTBIT; l'|E,N>X  
     break; v*&Uk '4E  
    default: //judge the key and send message Lf5%M|o.)  
     break; aXRv}WO$>k  
   } %l Q[dXp  
   for(int index=0;index<MAX_KEY;index++){ PPUEkvH W  
    if(hCallWnd[index]==NULL) 7sj<|g<h(_  
     continue; q]F4Lq(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S$S_nNq  
    { 3Z_t%J5QZ$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =Nw2;TkB[  
     bProcessed=TRUE; [m~b[ZwES  
    } 7;^((.]ln  
   } Bk&-1>cY  
  } YkSuwx@5_q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R78!x*U}  
   for(int index=0;index<MAX_KEY;index++){ 66/Z\H^d  
    if(hCallWnd[index]==NULL) | @uq()  
     continue; $2Kau 1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zT$0xj8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cZ^wQ5=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Kl2}o|b   
   } ~D*b3K 8X  
  } D`en%Lf!m  
 } T0;u+$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h5x*NM1Ih  
} R|-6o)$  
 wjL|Z8  
  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: w nWgy4:  
7LG+$LEz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); it~Z|$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;{Xy`{Cg!  
<]~ZPk[  
  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: A1Ka(3"  
[ne" T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CF\R<rF<VS  
{ 10?qjjb&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) yji>*XG  
 { c& 3#-DNI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :VJV5f{  
  SaveBmp(); _$8{;1$T?  
  return FALSE; `v~!H\q  
 } \9'!"-i  
 …… //其它处理及默认处理 EA6t36|TX  
} `%oIRuYG]j  
IJ0#iA. T  
\2j|=S6  
  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。 &-=K:;x  
T(JuL<PB  
  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。 <FQFv IKg  
p!}ZdX[u  
  二、编程步骤 b_|u<  
BMpF02Y|4  
  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"; #MglHQO+  
l0Y?v 4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y+A{Y  
7-X/>v  
  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; 0vn[a,W<A  
z{|LQt6q  
  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; qi&D+~Gv!  
'PpZ/ry$  
  5、 添加代码,编译运行程序。 FN!1| 'VK  
%l]Rh/VPn?  
三、程序代码 ;SKcbws  
};r|}v !~_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (i]Z|@|)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [x5mPjgw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ {]`p&@  
#if _MSC_VER > 1000 #9\THfb  
#pragma once pv&^D,H,  
#endif // _MSC_VER > 1000 t.)AggXj#  
#ifndef __AFXWIN_H__ 4-V)_U#8  
#error include 'stdafx.h' before including this file for PCH W$'0Dc  
#endif yj zK.dM  
#include "resource.h" // main symbols Xu#:Fe}:  
class CHookApp : public CWinApp Ak A!:!l  
{ h55>{)(E  
 public: L M /Ga  
  CHookApp(); Y\( ;!o0a  
  // Overrides {cR=N~_EO  
  // ClassWizard generated virtual function overrides gu<V (M\  
  //{{AFX_VIRTUAL(CHookApp) C ) ?uE'  
 public: =X@o@1  
  virtual BOOL InitInstance(); % O%xpSYr  
  virtual int ExitInstance(); b#a@ rh  
  //}}AFX_VIRTUAL [!~}S  
  //{{AFX_MSG(CHookApp) pj; I)-d/  
  // NOTE - the ClassWizard will add and remove member functions here. hcyO97@r  
  // DO NOT EDIT what you see in these blocks of generated code ! ;LQ9#M?  
  //}}AFX_MSG mU@xc N  
  DECLARE_MESSAGE_MAP() V!&P(YO:  
}; ]?&FOzN5$P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r~>,$[|n})  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %K1")s  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]JMl|e  
BOOL InitHotkey(); FN?3XNp.  
BOOL UnInit(); P1V1as  
#endif 9$RI H\*  
1'O0`Me>#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P^i.La,  
#include "stdafx.h" H;S%Y`V  
#include "hook.h" :=fvZAWD  
#include <windowsx.h> 3ZojE ux`  
#ifdef _DEBUG Hg+ F^2<y  
#define new DEBUG_NEW cj g.lzY H  
#undef THIS_FILE rMp9jG@3   
static char THIS_FILE[] = __FILE__; %|+E48  
#endif +S9PML){h  
#define MAX_KEY 100 ^E,1V5  
#define CTRLBIT 0x04 CDdkoajBa  
#define ALTBIT 0x02 X3B{8qx_>  
#define SHIFTBIT 0x01 >|*yh~  
#pragma data_seg("shareddata") A-uB\ L  
HHOOK hHook =NULL; F]_cbM{8/  
UINT nHookCount =0; /3B6 Mtb  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b$- e\XB!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o#D.9K(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GEe`ZhG,  
static int KeyCount =0; , Z ~;U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o6L9UdT   
#pragma data_seg() L CSeOR  
HINSTANCE hins; *#&*`iJ(  
void VerifyWindow(); e@n!x}t8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 'q{733o  
//{{AFX_MSG_MAP(CHookApp) Q6'nSBi:A_  
// NOTE - the ClassWizard will add and remove mapping macros here. tju|UhP3  
// DO NOT EDIT what you see in these blocks of generated code! W?XizTW  
//}}AFX_MSG_MAP i::\Z$L";i  
END_MESSAGE_MAP() 51xk>_Hm}|  
;[$n=VX`  
CHookApp::CHookApp() WsOi,oG@  
{ sl|_=oXT  
 // TODO: add construction code here, OB^Tq~i  
 // Place all significant initialization in InitInstance 0 f/.>1M=  
} ]axh*J3`i  
N_DT7  
CHookApp theApp; tE"Si<[]H$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Tg ?x3?kw  
{ -?a<qa?$  
 BOOL bProcessed=FALSE; Is.WZY a  
 if(HC_ACTION==nCode) XFqJ 'R  
 { q4 k@l  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0$P/jt  
   switch(wParam) & >JDPB?5  
   { n$)_9:Z-j  
    case VK_MENU: kQv*eZ~  
     MaskBits&=~ALTBIT; [=%YV# O  
     break; ,|T7hTn=  
    case VK_CONTROL: Ufid%T'  
     MaskBits&=~CTRLBIT; :@3Wg3N  
     break; v"Jgw;3  
    case VK_SHIFT: 'mMjjG9  
     MaskBits&=~SHIFTBIT; \wav?;z  
     break; 8im@4A+n`  
    default: //judge the key and send message 8cxai8  
     break; SU%DW4 6  
   } G*}F5.>8(  
   for(int index=0;index<MAX_KEY;index++){ yy2I2Bv  
    if(hCallWnd[index]==NULL) E^Gg '1  
     continue; [`_io>*g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mY&ud>,U:  
    { H AB#pd9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mZvG|P$}  
     bProcessed=TRUE; @xWdO,#  
    } o'V%EQ  
   } w YNloU  
  } (Xx n\*S  
  else if((lParam&0xc000ffff)==1){ //Key down ;3ft1  
   switch(wParam) m}Y0xV9  
   { sq0 PBEqq  
    case VK_MENU: G*8GGWB^a  
     MaskBits|=ALTBIT; 3sm M,fi  
     break; tpf7_YP_!-  
    case VK_CONTROL: NX6nQ  
     MaskBits|=CTRLBIT; DPHQ,dkp  
     break; r0dDHj~F  
    case VK_SHIFT: K\.5h4k  
     MaskBits|=SHIFTBIT; %!j:fJ()  
     break; o4^Fo p  
    default: //judge the key and send message i8pU|VpA  
     break; Ukphd$3J=  
   } qoU3"8  
   for(int index=0;index<MAX_KEY;index++) v:_B kHN'  
   { 9uB(Mx(-:`  
    if(hCallWnd[index]==NULL) 5F $V`kYT  
     continue; Ka_S n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zsl,,gk9Y  
    { e]>ori 8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FH5ql~  
     bProcessed=TRUE; '?*g%Yuz  
    }  -7]Xjb5  
   } v"DL'@$Ut{  
  } ]dPZ.r  
  if(!bProcessed){ 9ptFG]lZ  
   for(int index=0;index<MAX_KEY;index++){ !b|'Vp^U  
    if(hCallWnd[index]==NULL) b3$k9dmxV+  
     continue; c9Es%@]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^U7OMl4Usq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E_ucab-Fi  
   } adEJk  
  } v Y|!  
 } <g2_6C\j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T6 #"8qz<  
} kAzd8nJ'  
LxN*)[Wb  
BOOL InitHotkey() e_3CSx8Cc  
{ V,7%1TZ:  
 if(hHook!=NULL){ WgR4Ix^L#  
  nHookCount++; }odV_WT  
  return TRUE; VrP}#3I  
 } M~ h8Crz  
 else =d;Vk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &%aXR A#+  
  if(hHook!=NULL) d4^`}6@  
   nHookCount++; |PVt}*0"  
  return (hHook!=NULL); "kW!{n  
} }k$4/7ri  
BOOL UnInit() $\Lyi#<  
{ w2gf&Lc\  
 if(nHookCount>1){ ik1tidw  
  nHookCount--; Xo5$X7m  
  return TRUE; qB6dFl\ (  
 } &Y>zT9]$K  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,%"xH4d  
 if(unhooked==TRUE){ "AueLl)  
  nHookCount=0; 6)RbPPeE  
  hHook=NULL; +54aO  
 } D}mL7d1  
 return unhooked; {i{xo2<1"  
} 'w/qcD-  
&&8'0 .M{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *U7 %|wd  
{ nn~YK  
 BOOL bAdded=FALSE; FVWfDQ$&v  
 for(int index=0;index<MAX_KEY;index++){ !R{R??  
  if(hCallWnd[index]==0){ b}z`BRCc  
   hCallWnd[index]=hWnd; \|= mD}N  
   HotKey[index]=cKey; GUp;AoQ  
   HotKeyMask[index]=cMask; 0NE{8O0;Fr  
   bAdded=TRUE; ks(SjEF  
   KeyCount++; g$37;d3Tx  
   break; ".2K9j7$  
  } 'A{h iY  
 } j.?:Gaab?#  
 return bAdded; x!7yU_ls`  
} 0~A#>R'  
W.}].7}h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6Z:YT&,f  
{ fjz) Gp  
 BOOL bRemoved=FALSE; )$M,Ul  
 for(int index=0;index<MAX_KEY;index++){ +Ghi}v  
  if(hCallWnd[index]==hWnd){ TRvZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @s* ,xHE  
    hCallWnd[index]=NULL; %CH6lY=lI  
    HotKey[index]=0; }6m?d!m  
    HotKeyMask[index]=0; 5N/Lk>p1u  
    bRemoved=TRUE; 4cgIEw[6  
    KeyCount--; x"B' zP  
    break; w<nv!e?  
   } X T>('qy  
  } 19u =W(  
 } mf$j03tu  
 return bRemoved; dSK 0h(8  
} 7k8n@39?  
W Ox_y,  
void VerifyWindow() PXYE;*d(  
{ a:!uORQby  
 for(int i=0;i<MAX_KEY;i++){ ! p.^ITM3S  
  if(hCallWnd!=NULL){ M@7Xp)S"  
   if(!IsWindow(hCallWnd)){ D!3{gV#  
    hCallWnd=NULL; &y. dmW  
    HotKey=0; gQVBA %  
    HotKeyMask=0; hl/itSl$  
    KeyCount--; ;Rnhe_A.  
   } N+Sq}hI  
  } M}FWBs'*|  
 } $[CA&Y.  
} ,@CfVQz  
4br6$  
BOOL CHookApp::InitInstance() |r =DBd3  
{ ej[Su  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Xa,&ef&q  
 hins=AfxGetInstanceHandle(); 4O$2]D.\  
 InitHotkey(); @)0 Y~A )  
 return CWinApp::InitInstance(); #BJ\{"b_}z  
} MOZu.NmO  
kK[duW =6  
int CHookApp::ExitInstance() @EZ>f5IO+  
{ zG% |0  
 VerifyWindow(); 9M2f!kJP$  
 UnInit(); h_ ZX/k  
 return CWinApp::ExitInstance(); 'D6 bmz  
} `BT^a =5  
J W"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $Z6D:"K  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) g9V.13k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $WaZ_kt  
#if _MSC_VER > 1000 2VYvO=KA  
#pragma once MUwVG>b8J~  
#endif // _MSC_VER > 1000 r*d Q5 _  
eV;me>,  
class CCaptureDlg : public CDialog kK?zVH-!  
{ h6QWH  
 // Construction rO^xz7K^  
 public: <Jwo?[a  
  BOOL bTray; rm|7 [mK  
  BOOL bRegistered; Oxa5Kfpa  
  BOOL RegisterHotkey(); M,..Kw/ }~  
  UCHAR cKey; \R Z3Hh  
  UCHAR cMask; otnV-7)@  
  void DeleteIcon(); chLeq  
  void AddIcon(); G8P+A1 f/>  
  UINT nCount; d}% (jJ(I  
  void SaveBmp(); ,"H?hFQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !%62Phai  
  // Dialog Data ;&mxqY8`'  
  //{{AFX_DATA(CCaptureDlg) A2_Ls;]  
  enum { IDD = IDD_CAPTURE_DIALOG }; ZKQo#!}  
  CComboBox m_Key; %EIUAG  
  BOOL m_bControl; gz\j('~-D  
  BOOL m_bAlt; ?*o;o?5s^  
  BOOL m_bShift; !E0fGh  
  CString m_Path; vU 9ek:.l  
  CString m_Number; ,\>g  
  //}}AFX_DATA D pNX66O  
  // ClassWizard generated virtual function overrides E{oB2;P  
  //{{AFX_VIRTUAL(CCaptureDlg)  8bGD  
 public: %*p^$5L<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); hg&u0AQ2  
 protected: wRi~Yb?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kPedX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FvA|1c  
  //}}AFX_VIRTUAL =W |vOfy  
  // Implementation Bxt_a.LthH  
 protected: Gl"wEL*  
  HICON m_hIcon; ' tSnH&c  
  // Generated message map functions i6A$1(:h  
  //{{AFX_MSG(CCaptureDlg) Vy r] x  
  virtual BOOL OnInitDialog(); o{g@Nk'f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <>?^4NC<M  
  afx_msg void OnPaint(); oE5;|x3  
  afx_msg HCURSOR OnQueryDragIcon(); Ks51:M  
  virtual void OnCancel(); BiE$mM  
  afx_msg void OnAbout(); *Ji9%IA  
  afx_msg void OnBrowse(); ]%||KC!O  
  afx_msg void OnChange(); +>^[W~[2  
 //}}AFX_MSG F*. /D~K  
 DECLARE_MESSAGE_MAP() 9QZ}Hn`p  
}; ec#_olG%  
#endif A` =]RJ  
%Au T8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file > `0| X  
#include "stdafx.h" sq48#5Tc^r  
#include "Capture.h" qjzZ}  
#include "CaptureDlg.h" 9M;I$_U`vj  
#include <windowsx.h> /LSq%~UF  
#pragma comment(lib,"hook.lib") Jfe~ ,cI  
#ifdef _DEBUG ItMl4P`|  
#define new DEBUG_NEW svF*@(- P#  
#undef THIS_FILE \2(MpB\_6!  
static char THIS_FILE[] = __FILE__; tI `w;e%HN  
#endif ZIDFF  
#define IDM_SHELL WM_USER+1 pDP33`OFh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RlPjki"Mg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e1oFnu2R  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +7`u9j.  
class CAboutDlg : public CDialog *P&OxVz  
{ "[Yip5  
 public: ZjE~W>pkQ  
  CAboutDlg(); }1l}-w`F  
  // Dialog Data o:h)~[n|  
  //{{AFX_DATA(CAboutDlg) Ni&,g  
  enum { IDD = IDD_ABOUTBOX }; )0'Y et}  
  //}}AFX_DATA Z=0iPy,m>  
  // ClassWizard generated virtual function overrides //VG1@vaVX  
  //{{AFX_VIRTUAL(CAboutDlg) "sC$%D<oc  
 protected: H 3W_}f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $hC~af6  
  //}}AFX_VIRTUAL qdKh6{  
  // Implementation y>?k<)nA{  
 protected: }ZxW"5oq  
  //{{AFX_MSG(CAboutDlg) rHH#@ Zx  
  //}}AFX_MSG D "JMSL4r  
  DECLARE_MESSAGE_MAP() =B1`R%t  
}; M|5^':Y  
rjfc.l#v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 3 t~X:  
{ I #Arr#%  
 //{{AFX_DATA_INIT(CAboutDlg) f:)]FHPB1  
 //}}AFX_DATA_INIT #1gTpb+t  
} aMe%#cLI  
h}Fu"zK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1Al=v  
{ c`Lpqs`  
 CDialog::DoDataExchange(pDX); Tom}sFl][  
 //{{AFX_DATA_MAP(CAboutDlg) ?14X8Mb8W_  
 //}}AFX_DATA_MAP pmE1EDPag  
} 8Xt=eL/P  
uOy\{5s8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :/I={)5  
 //{{AFX_MSG_MAP(CAboutDlg) F>hVrUD8  
 // No message handlers ?)i6:76(  
 //}}AFX_MSG_MAP M$DwQ}Z  
END_MESSAGE_MAP() kW*W4{Fth  
0nF>zOmc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  p1[WGeV  
: CDialog(CCaptureDlg::IDD, pParent) aC $h_  
{ dA3`b*nC  
 //{{AFX_DATA_INIT(CCaptureDlg) NpjsZcA  
  m_bControl = FALSE; @pyA;>U  
  m_bAlt = FALSE; y0W`E/1t  
  m_bShift = FALSE; kr &:;  
  m_Path = _T("c:\\"); @5uyUSt]  
  m_Number = _T("0 picture captured."); r)*_,Fo|  
  nCount=0; lB YS>4~  
  bRegistered=FALSE; ^+YGSg7  
  bTray=FALSE; (]GY.(F{  
 //}}AFX_DATA_INIT IrVM|8vT3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5wVi{P5+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ixUiXP  
} LQuYCfj|  
c"jhbH!u4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "@):*3 4  
{ `\}zm~  
 CDialog::DoDataExchange(pDX); l7FZ;%&  
 //{{AFX_DATA_MAP(CCaptureDlg) J0{WqA.P  
  DDX_Control(pDX, IDC_KEY, m_Key); v: !7n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); S a#d?:L  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4%Wn}@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); D(2kb  
  DDX_Text(pDX, IDC_PATH, m_Path); pNk,jeo  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5}(YMsUb  
 //}}AFX_DATA_MAP TbSt {TX  
} V%Z[,C u+  
~vvQz"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) uc{Qhw!;:  
//{{AFX_MSG_MAP(CCaptureDlg) mYU dhL ^  
 ON_WM_SYSCOMMAND() pu m9x)y1  
 ON_WM_PAINT() `dq3=  
 ON_WM_QUERYDRAGICON() A/W7 ;D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qhHRR/p  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y_TL4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2&G1Q'!  
//}}AFX_MSG_MAP V-o`L`(F`  
END_MESSAGE_MAP() d}A2I  
smQpIB;  
BOOL CCaptureDlg::OnInitDialog() ` TVcI\W  
{ :j50]zLy{  
 CDialog::OnInitDialog(); /A`zy  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MsVI <+JZ  
 ASSERT(IDM_ABOUTBOX < 0xF000); `cTsS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U Edl"FwM4  
 if (pSysMenu != NULL) 3qwYicq,  
 { `0i}}Zo  
  CString strAboutMenu; xWI 0s;k  
  strAboutMenu.LoadString(IDS_ABOUTBOX); DcvmeGl  
  if (!strAboutMenu.IsEmpty()) X;[zfEB  
  { <38@b ]+  
   pSysMenu->AppendMenu(MF_SEPARATOR); )@&?i.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QR-R5XNT[  
  } kl<B*:RqH  
 } q@!H^hd}  
 SetIcon(m_hIcon, TRUE); // Set big icon R@{/$p:  
 SetIcon(m_hIcon, FALSE); // Set small icon Ydd>A\v\;  
 m_Key.SetCurSel(0); %}AY0fg?T  
 RegisterHotkey(); g5YsV p  
 CMenu* pMenu=GetSystemMenu(FALSE); {w1h<;MH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +!Gr`&w*)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6}FDLBA  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FZI 4?YD?<  
 return TRUE; // return TRUE unless you set the focus to a control C36.UZoc  
} X;a{JjN  
4I[FE;^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) HC`3AQ12!&  
{ h[)aRo  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &@Gu~)^(  
 { pD.@&J~  
  CAboutDlg dlgAbout; wk 7_(gT`0  
  dlgAbout.DoModal(); >+LgJo R  
 } u z2s-,  
 else '|R@k_nx  
 { F!cAaL1  
  CDialog::OnSysCommand(nID, lParam); Rm 1`D  
 } gBS#Z.  
} J^a"1|  
p?NjxQLA  
void CCaptureDlg::OnPaint() 3tcsj0Rb  
{ J7] 60H#P  
 if (IsIconic()) NjyIwo0  
 { MOeLphY  
  CPaintDC dc(this); // device context for painting YD.^\E4o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZvKMRW  
  // Center icon in client rectangle ;l4 \^E1  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6OW-Dif^AG  
  int cyIcon = GetSystemMetrics(SM_CYICON); EQhV}9  
  CRect rect; j7 3@Yi%  
  GetClientRect(&rect); ,(=]6V  
  int x = (rect.Width() - cxIcon + 1) / 2; h4i $z-!  
  int y = (rect.Height() - cyIcon + 1) / 2; oKJ7i,xT  
  // Draw the icon :P1c>:j[  
  dc.DrawIcon(x, y, m_hIcon); %$KO]   
 } fb;"J+  
 else Czxrn2p/  
 { A:J{  
  CDialog::OnPaint(); ~8{3Fc0  
 } ck+rOGv7{Z  
} 0l@+xS;  
.4(f0RG  
HCURSOR CCaptureDlg::OnQueryDragIcon() Y"%o\DS*  
{ o+Z9h1z%,  
 return (HCURSOR) m_hIcon; * v]UgPk  
} a$O]'}]`  
* XGBym  
void CCaptureDlg::OnCancel() OFbg]{ub?  
{ _=x_"rz x  
 if(bTray) ,RO(k4  
  DeleteIcon(); _q4m7C<  
  CDialog::OnCancel(); c/U6K yiK  
} N+75wtLy&  
Lc?O K"[m  
void CCaptureDlg::OnAbout() <J`xCm K  
{ Z?mg1;Q  
 CAboutDlg dlg; mh]$g<*m  
 dlg.DoModal(); :/qO*&i,N  
} r ngw6?`n-  
ii9/ UtIQ  
void CCaptureDlg::OnBrowse() &Z!2xfQy>  
{ Uk6!Sb  
 CString str; j56 An6g  
 BROWSEINFO bi; 7k|(5P;  
 char name[MAX_PATH]; xvl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); v2sU$M  
 bi.hwndOwner=GetSafeHwnd(); ,&G M\FTeb  
 bi.pszDisplayName=name; k;7.qhe:  
 bi.lpszTitle="Select folder"; ,[ L$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T_T{c+,Zd$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2A+,. S_!x  
 if(idl==NULL) +r_[Tj|Er  
  return; UUqj?'Nv  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); B,,d~\  
 str.ReleaseBuffer(); ^i\1c-/  
 m_Path=str; G - WJlu  
 if(str.GetAt(str.GetLength()-1)!='\\') yw!`1#3.  
  m_Path+="\\"; P.DWC'IBN  
 UpdateData(FALSE); ,O$C9pH9  
} f34&:xz2U  
G|_aU8b|t  
void CCaptureDlg::SaveBmp() mM>|fHGA  
{ 4V8wB}y7e  
 CDC dc; pr(\?\a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k5(yf~!c  
 CBitmap bm; :`1g{8.+  
 int Width=GetSystemMetrics(SM_CXSCREEN); eCD,[At/  
 int Height=GetSystemMetrics(SM_CYSCREEN); HC,@tfS  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f@L{*Upj+  
 CDC tdc; G[j79o  
 tdc.CreateCompatibleDC(&dc); ]M;! ])b$  
 CBitmap*pOld=tdc.SelectObject(&bm); 7:'>~>'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c F]3gM  
 tdc.SelectObject(pOld); =lQ[%&  
 BITMAP btm; 5AU3s  
 bm.GetBitmap(&btm); bz]O(`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oW6<7>1M7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !H\GHA'DO]  
 BITMAPINFOHEADER bih; I=a$1%BzEX  
 bih.biBitCount=btm.bmBitsPixel; }* JMc+!9@  
 bih.biClrImportant=0; a=VT|CX[  
 bih.biClrUsed=0; %nF\tVP3]  
 bih.biCompression=0; XtdLKYET  
 bih.biHeight=btm.bmHeight; S]O Hv6  
 bih.biPlanes=1; ,>v9 Y#U  
 bih.biSize=sizeof(BITMAPINFOHEADER); %[m1\h"1  
 bih.biSizeImage=size; >+8I =S  
 bih.biWidth=btm.bmWidth; r0 C6Ww7u  
 bih.biXPelsPerMeter=0; _\PoZ|G4y  
 bih.biYPelsPerMeter=0; E,yK` mPp^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VTfaZ/e.  
 static int filecount=0; L-{r*ccIW  
 CString name; rF3]AW(  
 name.Format("pict%04d.bmp",filecount++); g>P9hIl  
 name=m_Path+name; 1:UC\WW  
 BITMAPFILEHEADER bfh; JZxF)] ^  
 bfh.bfReserved1=bfh.bfReserved2=0; d2yHfl]3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); LfXr(2u  
 bfh.bfSize=54+size; N\p]+[6  
 bfh.bfOffBits=54; N o\&~  
 CFile bf; j88sE MZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Fxx2vTV4ag  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /+O8A}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 15DK \_;  
  bf.WriteHuge(lpData,size); b)^ZiRW``  
  bf.Close(); u?Mu*r?  
  nCount++; $OoN/^kv  
 } ld:alEo  
 GlobalFreePtr(lpData); ~ O=|v/]  
 if(nCount==1) )^f Q@C8  
  m_Number.Format("%d picture captured.",nCount); R9G)X]  
 else vaJXX  
  m_Number.Format("%d pictures captured.",nCount); }px]   
  UpdateData(FALSE); Kg-X]yu*0  
} i9U_r._qj;  
G<6grd5PP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $50"3g!Y  
{ _5 tqO5'  
 if(pMsg -> message == WM_KEYDOWN) ]GKx[F{)  
 { ) '`AX\  
  if(pMsg -> wParam == VK_ESCAPE) f<p4Pkv  
   return TRUE; <>Ddxmw  
  if(pMsg -> wParam == VK_RETURN) q'@Ei4  
   return TRUE; eE`1;13;  
 } $: m87cR~  
 return CDialog::PreTranslateMessage(pMsg); y$V)^-U>fw  
} /Py>HzRE:  
.|`=mx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >=:T ZU  
{ QF/u^|f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f,inQ2f}d  
  SaveBmp(); 'oQP:*Btl3  
  return FALSE; s Xk?.A_D  
} f<altz_\q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rtmt 3  
 CMenu pop; 15o *r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,Ysl$^\  
 CMenu*pMenu=pop.GetSubMenu(0); ,T*_mDVY  
 pMenu->SetDefaultItem(ID_EXITICON); VD3MJ8!w  
 CPoint pt; %7d@+ .  
 GetCursorPos(&pt); 3b\8907  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); mCNf]Yz  
 if(id==ID_EXITICON) rnv7L^9^A  
  DeleteIcon(); ]N <]  
 else if(id==ID_EXIT) %g@3S!lK  
  OnCancel(); b_gN?F7_  
 return FALSE; vcJb\LW  
} 'EET3R K-S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PeUd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j*~dFGl)  
 AddIcon(); OK?3,<x  
 return res; J$9xC{L4  
} AKC foJ  
s?x>Yl %  
void CCaptureDlg::AddIcon() 'BdmFKy1  
{ oT (:33$  
 NOTIFYICONDATA data; 0mD;.1:  
 data.cbSize=sizeof(NOTIFYICONDATA); hi D7tb=g~  
 CString tip; m|2]lb  
 tip.LoadString(IDS_ICONTIP); $< K)fbG  
 data.hIcon=GetIcon(0); }A)36  
 data.hWnd=GetSafeHwnd(); KD"&_PX  
 strcpy(data.szTip,tip); OWXye4`*  
 data.uCallbackMessage=IDM_SHELL; % X ,B-h^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m9<%v0r  
 data.uID=98; :e<`U~8m  
 Shell_NotifyIcon(NIM_ADD,&data); K l0tyeT  
 ShowWindow(SW_HIDE); +fP/|A8P  
 bTray=TRUE; L+~YCat|$U  
} cv*Q]F1%  
jFNs=D&(  
void CCaptureDlg::DeleteIcon() '0_j{ig  
{ -Mi}yi  
 NOTIFYICONDATA data; Op/79 ]$  
 data.cbSize=sizeof(NOTIFYICONDATA); H (NT|  
 data.hWnd=GetSafeHwnd(); 5hH6G  
 data.uID=98; AXh3LA  
 Shell_NotifyIcon(NIM_DELETE,&data); L740s[,`o#  
 ShowWindow(SW_SHOW); 60aKT:KLC_  
 SetForegroundWindow(); `f 6)Q`n  
 ShowWindow(SW_SHOWNORMAL); $v'Y:  
 bTray=FALSE; Ue g N-n  
} f*T)*R_  
Y( $Ji12  
void CCaptureDlg::OnChange() l'7Mw%6{  
{ *L;pcg8{  
 RegisterHotkey(); Q%n{*py  
} +r-dr>&H@  
Rg?{?qK\K  
BOOL CCaptureDlg::RegisterHotkey() S\3AW,c]w  
{ l4mUx`!  
 UpdateData(); b%[ nB  
 UCHAR mask=0; WE.$at{*h  
 UCHAR key=0; c.8((h/  
 if(m_bControl) lsB9;I^+x  
  mask|=4; 1] %W\RHxo  
 if(m_bAlt) /K,|k EE'n  
  mask|=2; s !hI:$J.  
 if(m_bShift) Cl t5  
  mask|=1; ,jbGM&.C  
  key=Key_Table[m_Key.GetCurSel()]; %0NkIQ`C  
 if(bRegistered){ zY1s7/$ i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =CKuiO.j  
  bRegistered=FALSE; 5i4V5N>3  
 } 77xq/c[)  
 cMask=mask; i[2bmd!H  
 cKey=key; s^g.42?u  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .L^pMU+!^  
 return bRegistered; gv#c~cX]  
} . Z*j!{@c  
# cN_y  
  四、小结 _)zmIB(}m  
ws>WA{]gq  
  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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