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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: { sZrI5   
  T7,tJk,(  
  一、实现方法 * T-XslI  
U3Q'ZT  
  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: iCH Z{<k  
#*~ (  
#pragma data_seg("shareddata") .1}u0IbJ  
HHOOK hHook =NULL; //钩子句柄 sC#Ixq'ls7  
UINT nHookCount =0; //挂接的程序数目 (d (whlF  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 M,9WF)p)V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0t9G $23  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Fm@GU  
static int KeyCount =0; LR^b?.#>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 IuTTMAt  
#pragma data_seg() T}zi P  
[ -%oO  
  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。 w#o<qrpHf  
|[qI2-el?  
  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: aw,8'N)  
l +#`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $Fo ,$  
cKey,UCHAR cMask) iX,Qh2(ig  
{ vEb~QX0~  
 BOOL bAdded=FALSE;  *Vc}W  
 for(int index=0;index<MAX_KEY;index++){ o(a*Fk$  
  if(hCallWnd[index]==0){ qaUHcdH  
   hCallWnd[index]=hWnd; 2Zl65  
   HotKey[index]=cKey; !~RD>N&n  
   HotKeyMask[index]=cMask; bi_R.sfK&  
   bAdded=TRUE; J/mLB7^R  
   KeyCount++; IXH;QwR:  
   break; SsaF><{5R  
  } SVR AkP-  
 } ;zGGT^Dn  
 return bAdded; 5Ph"*Rz%  
} ljk-xC p/  
//删除热键 R&-bA3w$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s0\X%U("  
{ R)H@'X  
 BOOL bRemoved=FALSE; ~"LOw_BRh  
 for(int index=0;index<MAX_KEY;index++){ dx~F [  
  if(hCallWnd[index]==hWnd){ 4(Mt6{q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |GMK@Q'0:  
    hCallWnd[index]=NULL; l@^RbF['  
    HotKey[index]=0; 2Gj&7A3b  
    HotKeyMask[index]=0; F|"NJ*o}  
    bRemoved=TRUE; m1frN#3  
    KeyCount--; . E.OBn  
    break; k<St:X%.O  
   } 5$y<nMP  
  } 'al-C;Z  
 } HezCRtxRcc  
 return bRemoved; c,+oH<bZZs  
} Hv%a\WNS1  
iA:CPBv_mu  
M+ H$Jjcs  
  DLL中的钩子函数如下: T$+}Srb  
H6~QSe0l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |#S!qnXB  
{ "=qdBG9  
 BOOL bProcessed=FALSE; Q.5a"(d@  
 if(HC_ACTION==nCode) ,,i;6q_f  
 { \tQRyj\|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 lD{9o2  
   switch(wParam) DB?[h<^m  
   {  ]A_)&`"Cb  
    case VK_MENU: ."MBKyg6  
     MaskBits&=~ALTBIT; u|Db%)[  
     break; ;Yi ;2ttW  
    case VK_CONTROL: Ble <n6  
     MaskBits&=~CTRLBIT; 1tD4 I  
     break; ne;,TJ\  
    case VK_SHIFT: T6{IuQjXs  
     MaskBits&=~SHIFTBIT; (=7e~'DC  
     break; br0gB3 r  
    default: //judge the key and send message u< ):gI  
     break; (/Nw  
   } ZY {,//  
   for(int index=0;index<MAX_KEY;index++){ f^nogw<z!  
    if(hCallWnd[index]==NULL) Vj`9j. 5  
     continue; FCOSgEU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WM9QC59  
    { * \f(E#wa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .O~)zM x  
     bProcessed=TRUE; $S6AqUk$  
    } 3dC8MKPq0  
   } 1!,lI?j,  
  } HSyohP87  
  else if((lParam&0xc000ffff)==1){ //有键按下 }>SHTHVye  
   switch(wParam) WtdWD_\%Y\  
   { ;c~6^s`2  
    case VK_MENU: %1xo|6hm-  
     MaskBits|=ALTBIT; taI])  
     break; b[H& vp  
    case VK_CONTROL: 8r+R~{  
     MaskBits|=CTRLBIT; , Lhgv1  
     break; wS8qua  
    case VK_SHIFT: nIXq2TzJ  
     MaskBits|=SHIFTBIT; RaG-9gujI  
     break; YW}1Mf=_  
    default: //judge the key and send message z[V|W  
     break; .LdLm991,Y  
   } t[7YMk  
   for(int index=0;index<MAX_KEY;index++){ O[Nc$dc  
    if(hCallWnd[index]==NULL) wB "&K;t  
     continue; 4km=KOx[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~[l2"@  
    { BpRQG]L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4RJ8 2yq-  
     bProcessed=TRUE; 6?z&G6  
    } .-fJ\`^mi  
   } ^D"}OQoh  
  } mJ[LmQ<:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $d4eGL2S  
   for(int index=0;index<MAX_KEY;index++){ vY6eg IO  
    if(hCallWnd[index]==NULL) pn>zuH e  
     continue; $0NWX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Pa%XLn'5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qFt%{~a S  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 nSmYa7  
   } "\]kK @,  
  } @D Qg1|m  
 } :>;-uve8'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )%f]`<o  
} FK;\Nce&  
R84 g<  
  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: D3vdO2H  
.0r5=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i=]IUjx<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a:7"F{D91  
>{$ ;O  
  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: .9S  
3@\vU~=P:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y+F$]!hw  
{ >5i1M^g(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) kT[]^Jtc  
 { yI h>j.P  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ]nEN3RJ  
  SaveBmp(); 9v_gR52vh  
  return FALSE; 0[x?Q[~S_0  
 } DbH{; Fb  
 …… //其它处理及默认处理 u3dhMnUn  
} AW!|xA6'`:  
L_=J(H|  
2< qq[2  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 (3&@c!E  
)p).}"   
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 sbQmPV  
RT F9;]Ti  
  二、编程步骤 Z[slN5]([  
/px*v<Aw1  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; tt6ElP|D  
~BaU2S@y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <~u.:x@ R  
b=Zg1SqV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 4qrPAt  
kZWc(LwA  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; l)Q,*i  
bv)E>%Yy  
  5、 添加代码,编译运行程序。 p}}}~ lC/  
b^;19]/RW  
三、程序代码 t9zPJQlT}  
\#lh b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hUxpz:U*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) cSnm\f  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ acRPKTs H  
#if _MSC_VER > 1000 jgs kK  
#pragma once ]j}zN2[A  
#endif // _MSC_VER > 1000 iePpJ>(  
#ifndef __AFXWIN_H__ eWhv X9 <  
#error include 'stdafx.h' before including this file for PCH {Ejv8UdA9  
#endif Z8}Zhe.  
#include "resource.h" // main symbols ACU0  
class CHookApp : public CWinApp `Btdp:j8i  
{ e-]k{_wm  
 public: (b GiBsb  
  CHookApp(); .1t$(]CyC  
  // Overrides KQNSYI7a  
  // ClassWizard generated virtual function overrides $xvEYK  
  //{{AFX_VIRTUAL(CHookApp) pr>K#@^  
 public: n,9 *!1y  
  virtual BOOL InitInstance(); Z>7Oez>  
  virtual int ExitInstance(); OV;Ho  
  //}}AFX_VIRTUAL X6N^<Z$  
  //{{AFX_MSG(CHookApp)  4O[5,  
  // NOTE - the ClassWizard will add and remove member functions here. k(3 s^B  
  // DO NOT EDIT what you see in these blocks of generated code ! uY5f mM9  
  //}}AFX_MSG aL-V9y  
  DECLARE_MESSAGE_MAP() D@"q2 !  
}; a`~$6 "v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hOO)0IrIM*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z5bmqhDo[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @J!)o d  
BOOL InitHotkey(); KVSy^-."  
BOOL UnInit(); Rl=NVo  
#endif Rqa#;wb!(  
6K[s),rdv  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Yc"G="XP;  
#include "stdafx.h" \@*cj8e  
#include "hook.h" aCMF[ 3j  
#include <windowsx.h> j &)|nK;}  
#ifdef _DEBUG nR!qolh  
#define new DEBUG_NEW ) ok_"wB  
#undef THIS_FILE tJ&S&[}  
static char THIS_FILE[] = __FILE__; H_o<!YxK  
#endif  &j2L- )  
#define MAX_KEY 100 V<\:iNXX{  
#define CTRLBIT 0x04 b0rC\^x  
#define ALTBIT 0x02 A:cc @ku  
#define SHIFTBIT 0x01 ?$ Uk[  
#pragma data_seg("shareddata") IgptiZ7~!  
HHOOK hHook =NULL; cJ&l86/l1  
UINT nHookCount =0; *[.+|v;A  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey e1[kgp   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT qdAz3iye  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H-1@z$p  
static int KeyCount =0; Ts}5Nk8%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1&i!92:E  
#pragma data_seg() P+%O]v1 Ob  
HINSTANCE hins; 9cQKXh:R.  
void VerifyWindow(); x1|5q/I  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) oQjh?vm  
//{{AFX_MSG_MAP(CHookApp) v)%EG  
// NOTE - the ClassWizard will add and remove mapping macros here. RVXRF_I  
// DO NOT EDIT what you see in these blocks of generated code! s,]6Lri`\  
//}}AFX_MSG_MAP nC_<pq^tr  
END_MESSAGE_MAP()  vF]?i  
,HUs MCXQ  
CHookApp::CHookApp() b3#c0GL  
{ :>F:G%(DK  
 // TODO: add construction code here, 85w D<bN27  
 // Place all significant initialization in InitInstance |uj1T=ZY  
} DS=kSkW^&5  
F2z^7n.S  
CHookApp theApp; Mff_j0D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E@0w t^  
{ E{wVf_K  
 BOOL bProcessed=FALSE; U1 1rj,7  
 if(HC_ACTION==nCode) fR_)e:  
 { OAOG&6xu8  
  if((lParam&0xc0000000)==0xc0000000){// Key up f*NtnD=rJ  
   switch(wParam)   
   { b ?B"u^b!  
    case VK_MENU: vTh-I&}:  
     MaskBits&=~ALTBIT; ~Xh(JK]  
     break; TG{=~2  
    case VK_CONTROL: Tk|0 scjE^  
     MaskBits&=~CTRLBIT; MR#jI  
     break; [|ky~sRr  
    case VK_SHIFT: '=\]4?S  
     MaskBits&=~SHIFTBIT; #U"\v7C{n  
     break; Hu1w/PLq  
    default: //judge the key and send message qAivsYN*  
     break; .NQoqXR  
   } J4!Z,-  
   for(int index=0;index<MAX_KEY;index++){ &EE6<-B-  
    if(hCallWnd[index]==NULL) 8ENAif   
     continue; ##}a0\x|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d0MX4bhZ  
    { j 9y,UT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E+ JGqk  
     bProcessed=TRUE; Y0&w;P  
    } ^%IKlj- E  
   } qf4|!UR{  
  } ,y:q]PR  
  else if((lParam&0xc000ffff)==1){ //Key down }b)?o@9}:  
   switch(wParam) Pkc4=i,`A  
   { |os2@G$  
    case VK_MENU: xot q$r  
     MaskBits|=ALTBIT; M}(4>W  
     break; QTcngv[  
    case VK_CONTROL: R?Iv<(I  
     MaskBits|=CTRLBIT; $v-lG(  
     break; &fiDmUxj  
    case VK_SHIFT: 4y>G6TD^  
     MaskBits|=SHIFTBIT; '9$xOrv  
     break; [GU!],Y  
    default: //judge the key and send message qe`W~a9x  
     break; cvn,&G -`  
   } |n01T_Z)P  
   for(int index=0;index<MAX_KEY;index++) je_77G(F  
   { b]hRmW  
    if(hCallWnd[index]==NULL) =1VY/sv  
     continue; 1?E\2t&K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) goRoi\z $  
    { r/:9j(yxr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :d)@|SR1  
     bProcessed=TRUE; b[e+(X  
    } 2>ce(4Gky  
   } $Snwx  
  } GrVvOJr  
  if(!bProcessed){ 8eWb{n uJ>  
   for(int index=0;index<MAX_KEY;index++){ w2/%e$D!9  
    if(hCallWnd[index]==NULL) J\m7U  
     continue; m[ifcDZ(e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -']#5p l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h8pc<t\6  
   } hCW8(Zt  
  } @ mt v2P`  
 } B quyPG"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B:^5W{  
} X+P3a/T  
;2#7"a^  
BOOL InitHotkey() W5J"#^kdF8  
{ axXA y5  
 if(hHook!=NULL){ *!C^L"i  
  nHookCount++; +qzsC/y  
  return TRUE;  M"X/([G  
 } "=P@x|I  
 else N{|N_}X`Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); He"> kJx  
  if(hHook!=NULL) }I05&/o.3p  
   nHookCount++; pOnZ7(  
  return (hHook!=NULL); >jN)9}3>-#  
} +]5JXt^  
BOOL UnInit() )Je iTh^  
{ M ;\K+,  
 if(nHookCount>1){ *Z)`:Gae  
  nHookCount--; ME0ivr*=:  
  return TRUE; "9>#Q3<N  
 } -bZ^A~<O,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |Vd)7/LN  
 if(unhooked==TRUE){ .$99/2[90  
  nHookCount=0; uh:  
  hHook=NULL; |{t}ULc  
 } %ze Sx  
 return unhooked; %z.u % %  
} JGGss5  
O?8G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xV<NeU  
{ MttVgNV  
 BOOL bAdded=FALSE; <aL$d7  
 for(int index=0;index<MAX_KEY;index++){ X@|  
  if(hCallWnd[index]==0){ ro^Y$;G  
   hCallWnd[index]=hWnd; bG2 !5m4L  
   HotKey[index]=cKey; &qrH  
   HotKeyMask[index]=cMask; "z@q G]#5  
   bAdded=TRUE; (iBBdB  
   KeyCount++; ]9;WM.  
   break; N9,n/t  
  } Y,>])R[4  
 } l#]Z?zW.  
 return bAdded; ;v8,r#4  
} BuK82   
Dugr{Y/0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BR"*-$u0;  
{ /F/`?=1<$  
 BOOL bRemoved=FALSE; i&"I/!3Q@  
 for(int index=0;index<MAX_KEY;index++){ *k=Pk  
  if(hCallWnd[index]==hWnd){ L7a+ #mGE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H'Z[3e  
    hCallWnd[index]=NULL; jr~76  
    HotKey[index]=0; P9X/yZ42  
    HotKeyMask[index]=0; ^[^uDE <  
    bRemoved=TRUE; =0x[Sa$&,  
    KeyCount--; )0qXZ gs  
    break; VPtA %1  
   } xJc'tT6@  
  } rpDH>Hzq  
 } D&Ngg)_Mq  
 return bRemoved; F?5kl/("  
} 3smcCQA%  
Z#"6&kv  
void VerifyWindow() .`xcR]PQ  
{ >q[Elz=dI  
 for(int i=0;i<MAX_KEY;i++){ P%%Cd  
  if(hCallWnd!=NULL){ :R<,J=+$u  
   if(!IsWindow(hCallWnd)){ <<4G GO  
    hCallWnd=NULL; BXyZn0k  
    HotKey=0; ];zi3oS^  
    HotKeyMask=0; o8Q(,P  
    KeyCount--; !7^fji  
   } i"sVk8+o!  
  } C.pNDpx-  
 } .o.@cLdU  
} jf.ikxm  
}JrM!'  
BOOL CHookApp::InitInstance() F}i rCi47c  
{ OO53U=NU  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gt{ei)2b  
 hins=AfxGetInstanceHandle(); TZ-n)rC)v  
 InitHotkey(); B\Rq0N]' M  
 return CWinApp::InitInstance(); ]'2p"A0U  
} .+{nfmc,c  
v2rXuo  
int CHookApp::ExitInstance() <f{m=Dc  
{ B>AIec\jG  
 VerifyWindow(); `^ F'af  
 UnInit(); >.J68 x  
 return CWinApp::ExitInstance(); <[l2]"Q  
} M*aE)D '  
tty 6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file M(?|$$   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .t7D/_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HT kce,dQ  
#if _MSC_VER > 1000 6q6&N'We  
#pragma once `=%[  
#endif // _MSC_VER > 1000 '<6Gz7O  
2ORWdR.b  
class CCaptureDlg : public CDialog oBKZ$&_h  
{ 49Ht I9@  
 // Construction Q.M3rRh  
 public: K& 2p<\2  
  BOOL bTray; tlqDY1  
  BOOL bRegistered; od?Q&'A  
  BOOL RegisterHotkey(); AvP*p{we  
  UCHAR cKey; $T]1<3\G  
  UCHAR cMask; I2K52A+  
  void DeleteIcon(); HmRwh  
  void AddIcon(); D.R5-  
  UINT nCount; [9aaHf@'  
  void SaveBmp(); l<z[)fE{uS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kq6m5A]z  
  // Dialog Data ~iF*+\  
  //{{AFX_DATA(CCaptureDlg) p~Dm3^Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; UxD1+\N6?  
  CComboBox m_Key; sOU_j4M{  
  BOOL m_bControl; R0*DfJS:Z  
  BOOL m_bAlt; uTB; Bva  
  BOOL m_bShift; @RbAC*Y]g  
  CString m_Path; ~~ )&? \N  
  CString m_Number; >,hJ5-9  
  //}}AFX_DATA XD%?'uUQ_  
  // ClassWizard generated virtual function overrides HRx#}hN?+  
  //{{AFX_VIRTUAL(CCaptureDlg) ;#fB=[vl";  
 public: gEU)UIJ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6sB!m|zm]:  
 protected: pN4!*7M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "%A[%7LY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :qgdn,Me  
  //}}AFX_VIRTUAL 6TPcG dZ  
  // Implementation ,FS iE\  
 protected: SuGlNp>#qm  
  HICON m_hIcon; A(;J  
  // Generated message map functions d'Gv\i&e  
  //{{AFX_MSG(CCaptureDlg) y%E R51+  
  virtual BOOL OnInitDialog(); (IJf2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f&^Ea-c  
  afx_msg void OnPaint(); Y k~ i.p  
  afx_msg HCURSOR OnQueryDragIcon(); _2f}WY3S  
  virtual void OnCancel(); 8a. |CgI#h  
  afx_msg void OnAbout(); T7cT4PAW  
  afx_msg void OnBrowse(); \mWXr*;  
  afx_msg void OnChange(); i&.F}bEi  
 //}}AFX_MSG 4B (*{  
 DECLARE_MESSAGE_MAP() K%Q^2"Eb0  
}; Mt@K01MI%  
#endif &sx/qS#,VL  
{ H9pF2C  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file CAc nH  
#include "stdafx.h" n (cSfT  
#include "Capture.h"  \2eYw.I=  
#include "CaptureDlg.h" }})4S;j  
#include <windowsx.h> 8 _`Lx_R  
#pragma comment(lib,"hook.lib") ?:n{GK  
#ifdef _DEBUG tGM)"u-  
#define new DEBUG_NEW G/<{:R"  
#undef THIS_FILE /:awPYGH<1  
static char THIS_FILE[] = __FILE__; #c/v2  
#endif 1`2lTkg  
#define IDM_SHELL WM_USER+1 hn!$?Vo.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5:n&G[Md  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sPc\xY  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \hNMTj#O  
class CAboutDlg : public CDialog =Ee f  
{ u!L8Sv  
 public: z{!wQ~ j  
  CAboutDlg(); / HaS.  
  // Dialog Data :p8JO:g9  
  //{{AFX_DATA(CAboutDlg) ?7a< V+V:  
  enum { IDD = IDD_ABOUTBOX }; C .YtjLQP$  
  //}}AFX_DATA rw+0<r3|K  
  // ClassWizard generated virtual function overrides ( 7Y :3  
  //{{AFX_VIRTUAL(CAboutDlg) TvI}yaCu/x  
 protected: )](8 {}wo  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O@E&lP6  
  //}}AFX_VIRTUAL i1aS2gFi_  
  // Implementation }zLe;1Tx  
 protected: hih`:y  
  //{{AFX_MSG(CAboutDlg) GIZNHG   
  //}}AFX_MSG /hI#6k8o_  
  DECLARE_MESSAGE_MAP() _Q.3X[88C  
}; Y>%A*|U%  
X4%*&L  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;y5cs;s  
{ =WDf [?ED  
 //{{AFX_DATA_INIT(CAboutDlg) \dufKeiS&a  
 //}}AFX_DATA_INIT 8|7Tk[X1j  
} 6{+~B2Ef  
WNL3+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }[i35f[w  
{ y)(SS8JR  
 CDialog::DoDataExchange(pDX); A9tQb:  
 //{{AFX_DATA_MAP(CAboutDlg) \N"K^kR4  
 //}}AFX_DATA_MAP rt~X (S  
} pF"z)E|^  
D4o?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K=06I  
 //{{AFX_MSG_MAP(CAboutDlg) U35}0NT _  
 // No message handlers wu 3uu1J  
 //}}AFX_MSG_MAP V TEyqo2  
END_MESSAGE_MAP() ,LzS"lmmo  
|h6 @hB\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Zjo9c{\  
: CDialog(CCaptureDlg::IDD, pParent) Jw {:1  
{ G]&:">&R  
 //{{AFX_DATA_INIT(CCaptureDlg) t.knYO)  
  m_bControl = FALSE; K h% x  
  m_bAlt = FALSE; ={feN L  
  m_bShift = FALSE; 1N#TL"lMS  
  m_Path = _T("c:\\"); d5zzQ]|L  
  m_Number = _T("0 picture captured."); w_|WberU  
  nCount=0; iZ_R oJ  
  bRegistered=FALSE; V?Nl%M[b  
  bTray=FALSE; ;\#u19  
 //}}AFX_DATA_INIT QMfYM~o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QAb[M\G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^OA}#k NTW  
} *xLMs(gg  
zlFl{t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Bq:@ [pCQ  
{ OWq~BZ{  
 CDialog::DoDataExchange(pDX); `yC R.3+  
 //{{AFX_DATA_MAP(CCaptureDlg) jq =-Y  
  DDX_Control(pDX, IDC_KEY, m_Key); AHZ6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Q g"{F},4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); s0nihX1Z-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?TzN?\   
  DDX_Text(pDX, IDC_PATH, m_Path); wy Le3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6xBP72L;%"  
 //}}AFX_DATA_MAP &ul9N)A  
} +d'h20  
EB> RY+\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MuO>O97  
//{{AFX_MSG_MAP(CCaptureDlg) j|? bva\  
 ON_WM_SYSCOMMAND() <F=j6U7   
 ON_WM_PAINT() {[Yv@CpN  
 ON_WM_QUERYDRAGICON() +Z{ 4OJK  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) T>?sPq  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 93'%aSDI%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h+*  
//}}AFX_MSG_MAP Q&F@[k  
END_MESSAGE_MAP() $6'xRUx X  
9)4N2=  
BOOL CCaptureDlg::OnInitDialog() ;'<K}h  
{ #lct"8  
 CDialog::OnInitDialog(); SH`"o  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <&+l;z  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y[x ^59  
 CMenu* pSysMenu = GetSystemMenu(FALSE); crhck'?0  
 if (pSysMenu != NULL) Zn9w1ev  
 { I1}{7-_t  
  CString strAboutMenu;  /?_{DMt  
  strAboutMenu.LoadString(IDS_ABOUTBOX); (U7%Z<  
  if (!strAboutMenu.IsEmpty()) o[cKh7&+  
  { -rH3rKtf~  
   pSysMenu->AppendMenu(MF_SEPARATOR); @pG\5Jnf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \8t g7Sdq  
  } qC3 rHT]  
 } -<s?`Rnk  
 SetIcon(m_hIcon, TRUE); // Set big icon T`WFY  
 SetIcon(m_hIcon, FALSE); // Set small icon pH"LZ7)DI0  
 m_Key.SetCurSel(0); qKSM*k~  
 RegisterHotkey(); r!x^P=f,MJ  
 CMenu* pMenu=GetSystemMenu(FALSE); @nZFw.  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); cF/FretoO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^|sQkufo  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'Y&yt"cs  
 return TRUE; // return TRUE unless you set the focus to a control {) .=G  
} PD/~@OsxU  
I&(cdKY z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _nTjCN625  
{ H%sQVE7m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^lQ-w|7(  
 { B2,! 0Re  
  CAboutDlg dlgAbout; b(XhwkGVq  
  dlgAbout.DoModal(); %9zcc)cP  
 } m' aakq  
 else G! 87F/  
 { I O6i  
  CDialog::OnSysCommand(nID, lParam); s*!2oj  
 } jf$t  
} ".@SQgyb0  
g`&pQ%|=  
void CCaptureDlg::OnPaint() chiQ+  
{ Ar):D#D  
 if (IsIconic()) }& 1_gn15  
 { J#X7Ss  
  CPaintDC dc(this); // device context for painting Vy5Q+gw  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~w$8*2D  
  // Center icon in client rectangle m _]"L  
  int cxIcon = GetSystemMetrics(SM_CXICON); z5i!GJB  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5w1=j\oq  
  CRect rect; Ri-I+7(n!  
  GetClientRect(&rect); c?opVbJB\  
  int x = (rect.Width() - cxIcon + 1) / 2; +"SBt}1  
  int y = (rect.Height() - cyIcon + 1) / 2; Az.Y-O<$\  
  // Draw the icon TVjY8L9'h  
  dc.DrawIcon(x, y, m_hIcon); [S<DdTY9hZ  
 } i;\i4MT  
 else Z,d/FC#y(  
 { @*c+`5)_  
  CDialog::OnPaint(); x[>A'.m@)  
 } e EU :  
} Aa1 |{^$:L  
x/4lD}Pw]  
HCURSOR CCaptureDlg::OnQueryDragIcon()  !c*^:0  
{ T}\U:@b  
 return (HCURSOR) m_hIcon; &O%Kj8)  
} ;bA9(:?  
I{RktO;1  
void CCaptureDlg::OnCancel() fB:M'A'  
{ p(U'Ydl~  
 if(bTray) n&Al~-Q:^  
  DeleteIcon(); kKjYMYT6  
  CDialog::OnCancel(); /`'50C j  
} fO:*85 %}7  
zY#U]Is  
void CCaptureDlg::OnAbout() ^QnVYTM  
{ +0=RC^   
 CAboutDlg dlg; "@f`O  
 dlg.DoModal(); DL~LSh  
} qGh rJ6R!  
@*_K#3  
void CCaptureDlg::OnBrowse() g`Rs;  
{ Xpa;F$VI  
 CString str; ,O-lDzcw  
 BROWSEINFO bi; Y8AU<M  
 char name[MAX_PATH]; %V+,#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Us%VB q  
 bi.hwndOwner=GetSafeHwnd(); /g8yc'{p  
 bi.pszDisplayName=name; :]//{HF  
 bi.lpszTitle="Select folder"; dIf Jr}ih  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t /47lYN)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [UI bO@e  
 if(idl==NULL) ZPMEN,Dw  
  return; cdh1~'q/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9j,zaGD0  
 str.ReleaseBuffer(); 7"QcvV@p  
 m_Path=str; +(P;4ZOmB  
 if(str.GetAt(str.GetLength()-1)!='\\') G_o/ lIz"  
  m_Path+="\\"; Onc!5L  
 UpdateData(FALSE); cX&c%~  
} cf j6I  
E@@quK  
void CCaptureDlg::SaveBmp() R]r~TJ o  
{ Ny~;"n  
 CDC dc; TQEZ<B$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -S|L+">=Z  
 CBitmap bm; ,{oANqP  
 int Width=GetSystemMetrics(SM_CXSCREEN); `#(4K4]1.  
 int Height=GetSystemMetrics(SM_CYSCREEN); l,/5$JGnk  
 bm.CreateCompatibleBitmap(&dc,Width,Height); $@U`zy"Y  
 CDC tdc; @vv`86bm  
 tdc.CreateCompatibleDC(&dc); UtWoSFZ'o!  
 CBitmap*pOld=tdc.SelectObject(&bm); -meKaQv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GV2}K <s  
 tdc.SelectObject(pOld); q&N&n%rbm  
 BITMAP btm; x7*}4>|W,I  
 bm.GetBitmap(&btm); 3!}#@<j  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; i$F)h<OU+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $6J5yE  
 BITMAPINFOHEADER bih; '2 )d9_ w  
 bih.biBitCount=btm.bmBitsPixel; c^=:]^  
 bih.biClrImportant=0; 1XZ&X]  
 bih.biClrUsed=0; -p)HH@6a  
 bih.biCompression=0; NT-du$! u  
 bih.biHeight=btm.bmHeight; pG4Hy$e  
 bih.biPlanes=1;  <Nw?9P  
 bih.biSize=sizeof(BITMAPINFOHEADER); W35nnBU  
 bih.biSizeImage=size; gr7W&2x7\  
 bih.biWidth=btm.bmWidth; Y#Z&$&n  
 bih.biXPelsPerMeter=0; hyBSS,I  
 bih.biYPelsPerMeter=0; ;w+A38N$J  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;WzT"yW)T  
 static int filecount=0; `hfwZ*s  
 CString name; <W5F~K ;41  
 name.Format("pict%04d.bmp",filecount++); ]xS< \{og  
 name=m_Path+name; b&e? 6h^G  
 BITMAPFILEHEADER bfh; Wm\f:|U5`  
 bfh.bfReserved1=bfh.bfReserved2=0; `"bm Hs7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ogPfz/ hw  
 bfh.bfSize=54+size; ,~3sba  
 bfh.bfOffBits=54; u ) ld  
 CFile bf; VJNPs6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L,l+1`Jz  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Gm|QOuw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }tJ:-!*2  
  bf.WriteHuge(lpData,size); bVVa5? HP  
  bf.Close(); T JVNR_x  
  nCount++; 9XoKOR(  
 } 1'd "O @  
 GlobalFreePtr(lpData); )GR^V=o7,Y  
 if(nCount==1) m2V4nxw]Qp  
  m_Number.Format("%d picture captured.",nCount); jK{CjfCNz  
 else xE9s=}  
  m_Number.Format("%d pictures captured.",nCount); INkrG.=u  
  UpdateData(FALSE); l/1uP  
} v` B_xEl  
+I/P5OGRN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aE;!mod  
{ ^@)+P/&  
 if(pMsg -> message == WM_KEYDOWN) Y<|L|b6  
 { 9sRP8Nj|  
  if(pMsg -> wParam == VK_ESCAPE) ?,Hk]Rl3  
   return TRUE; 8!T^KMfz  
  if(pMsg -> wParam == VK_RETURN) kg-%:;y.  
   return TRUE; zL_X?UmV  
 } d~n+Ds)%F  
 return CDialog::PreTranslateMessage(pMsg); 6\]-J*e>  
} Pjx9@i  
Gis'IX(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4RzG3CJdS  
{ sC}/?^q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -OziUM1qs  
  SaveBmp(); fZGKVxo"  
  return FALSE; ZHB'^#b  
} * T~sR'K+|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jb*#!m.l  
 CMenu pop; m4%m0"Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); J=Jw"? f  
 CMenu*pMenu=pop.GetSubMenu(0); Y>z(F\  
 pMenu->SetDefaultItem(ID_EXITICON); nbYaYL?&  
 CPoint pt; {b+IDq`)=  
 GetCursorPos(&pt); g_}@/5?y  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G3e%~  
 if(id==ID_EXITICON) ^ZV xBQKg  
  DeleteIcon(); V*/))n?  
 else if(id==ID_EXIT) Mc\lzq8\ 1  
  OnCancel(); ;or> Sh7  
 return FALSE; f.u{;W  
} ,%:`Ll t]$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -Pvt+I>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {=(4  
 AddIcon(); A,iXiDb3pK  
 return res; w}E?FEe.  
} me9RnPe:  
)WzCUYE1/  
void CCaptureDlg::AddIcon() qVY\5`f@  
{ w68qyG|wM  
 NOTIFYICONDATA data; Tq?W @DM*  
 data.cbSize=sizeof(NOTIFYICONDATA); q`\lvdl  
 CString tip; 8cd,SQ}y  
 tip.LoadString(IDS_ICONTIP); BpK P]V  
 data.hIcon=GetIcon(0); k'\RS6M`L  
 data.hWnd=GetSafeHwnd(); kC#;j=K?  
 strcpy(data.szTip,tip); v<-D>iJ  
 data.uCallbackMessage=IDM_SHELL; |UBJu `%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0(..]\p^d  
 data.uID=98; J 5\> 8I,a  
 Shell_NotifyIcon(NIM_ADD,&data); GC{Ys|s  
 ShowWindow(SW_HIDE); Isi ,Tl ^  
 bTray=TRUE; Z-~^)lo  
} kP|!!N  
L Y M`  
void CCaptureDlg::DeleteIcon() qa Q  
{ n|F`6.G  
 NOTIFYICONDATA data; .3Ap+V8?  
 data.cbSize=sizeof(NOTIFYICONDATA); Ex Qld  
 data.hWnd=GetSafeHwnd(); c.XLEjV|  
 data.uID=98; @e slF  
 Shell_NotifyIcon(NIM_DELETE,&data); I4)vJ0  
 ShowWindow(SW_SHOW); Obd!  
 SetForegroundWindow(); `W/6xm(X5;  
 ShowWindow(SW_SHOWNORMAL); wgufk {:  
 bTray=FALSE; QO%LSRw  
} zzxU9m~"  
B O"+m  
void CCaptureDlg::OnChange() {!="PnB  
{ %?g]{  
 RegisterHotkey(); {7;T Q?/  
} :DZiDJ@  
6?Wsg`9  
BOOL CCaptureDlg::RegisterHotkey() fY `A  
{ 6v1j*'  
 UpdateData(); FX'W%_f,  
 UCHAR mask=0; m760K*:i\  
 UCHAR key=0; T&h|sa(   
 if(m_bControl) 'R$~U?i8  
  mask|=4; 0q3 :"X  
 if(m_bAlt) <9Chkb|B  
  mask|=2;  Ne4A  
 if(m_bShift) ^.4<#Qs  
  mask|=1; NfSe(rd  
  key=Key_Table[m_Key.GetCurSel()]; NT nn!k  
 if(bRegistered){ ZqhINM*Rm  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); k82'gJ;MC=  
  bRegistered=FALSE; n2QD*3i  
 } z4<h)hh"k6  
 cMask=mask; A76=^ iw  
 cKey=key; R:fu n ,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )Qo6bei!  
 return bRegistered; QR#,n@fE  
} (kSk bwu  
EUNG&U  
  四、小结 9f V57  
N0XGW_f  
  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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