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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: -q\1Tlc]3  
  r!etj3  
  一、实现方法 9[B*CD |  
hM(|d@)  
  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: >+fet ,  
?!~CX`eMZ  
#pragma data_seg("shareddata") (Y!@,rKd   
HHOOK hHook =NULL; //钩子句柄 ( _E<?  
UINT nHookCount =0; //挂接的程序数目 #f~#38_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U w][U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vh+Ih Gi  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T.aY {Y  
static int KeyCount =0; h5ST`jZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 dH zo_VV  
#pragma data_seg() >t O(S  
BfIGw  
  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。 -2mm 5E~N  
q!9SANTx  
  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: R y0n_J:7  
!["WnF{5eC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR D'#Wc#b  
cKey,UCHAR cMask) 5+'1 :Sa(i  
{ Rg,pC.7;  
 BOOL bAdded=FALSE; qv=i eU  
 for(int index=0;index<MAX_KEY;index++){ "wTA9\  
  if(hCallWnd[index]==0){ ]Z@- r  
   hCallWnd[index]=hWnd; ' Ky5|4  
   HotKey[index]=cKey; PSNrY e  
   HotKeyMask[index]=cMask;  &jf:7y  
   bAdded=TRUE; ~k4S~!(U0  
   KeyCount++; 4r5?C;g  
   break; BYrj#n5  
  } y}5H<ZcXA  
 } < ppg$;  
 return bAdded; >c?Z.of  
} +EJIYvkFm  
//删除热键 y'pAhdF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) InMF$pw  
{ `TOm.YZG  
 BOOL bRemoved=FALSE; *obBo6!zM  
 for(int index=0;index<MAX_KEY;index++){ gyJ$ Jp  
  if(hCallWnd[index]==hWnd){ &mKtW$K` q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EV z>#GC  
    hCallWnd[index]=NULL; 3Qfj=; 4  
    HotKey[index]=0; G0|j3y9$  
    HotKeyMask[index]=0; vu;pILN  
    bRemoved=TRUE; -S OP8G  
    KeyCount--; hkee,PiiP  
    break; } O8|_d  
   } [ K;3Qf)  
  } lh&Q{t(+8  
 } M;,Q8z%  
 return bRemoved; ]i)m   
} ,n}X,#]  
xg k~y,F  
lphQZ{8  
  DLL中的钩子函数如下: J84Q|E  
Ua)ARi %  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5\V>Sj(  
{ f+j\,LJ  
 BOOL bProcessed=FALSE; &aqF ||v%)  
 if(HC_ACTION==nCode) K 38e,O  
 { )'KkO$^&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \m~ ?mg"#  
   switch(wParam) 61HU_!A8S  
   {  iF?4G^  
    case VK_MENU: \L-o>O  
     MaskBits&=~ALTBIT; eYMp@Cx  
     break; 0 Ji>dr n  
    case VK_CONTROL: |T atRB3>  
     MaskBits&=~CTRLBIT; @-Tt<pl'L  
     break; 6LrG+p`  
    case VK_SHIFT: 1WRQjT=o  
     MaskBits&=~SHIFTBIT; a.#`>  
     break; j BS$xW  
    default: //judge the key and send message fgK1+sW  
     break; YD_hg#=n  
   } `h}fS4CO  
   for(int index=0;index<MAX_KEY;index++){ c"Ddw'?e  
    if(hCallWnd[index]==NULL) f^b.~jXSR}  
     continue; )-%3;e<w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nj$TdwZbK  
    { zgXg-cr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); S<H 2e{~  
     bProcessed=TRUE; @&p:J0hbp  
    } 1t wC-rC  
   } 3DRJl, v  
  } Ybo:2e  
  else if((lParam&0xc000ffff)==1){ //有键按下 jR[VPm=  
   switch(wParam) \H^DiF%f9  
   { Hd]o?q\  
    case VK_MENU: 2wLnRP`*  
     MaskBits|=ALTBIT; ICA p  
     break; Z" j #kaXA  
    case VK_CONTROL: DSjEoWj   
     MaskBits|=CTRLBIT; |LhVANz  
     break; B;x5os  
    case VK_SHIFT: (7Su{tq  
     MaskBits|=SHIFTBIT; E/[>#%@i  
     break; g>` k9`  
    default: //judge the key and send message 3-x ;_  
     break; 'KvS I=$  
   } :%G_<VAo!  
   for(int index=0;index<MAX_KEY;index++){ U9"g;t+/   
    if(hCallWnd[index]==NULL) U'~M(9uv:  
     continue; [g )HoR=&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &:Q^j:  
    { HiAj3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DO*rVs3'p[  
     bProcessed=TRUE; ^m0nInH  
    } \f~m6j$D_  
   } `CpfQP&^  
  } XZ%3PMq  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 nA owFdCD  
   for(int index=0;index<MAX_KEY;index++){ 6g*?(Y][  
    if(hCallWnd[index]==NULL) <pA%|]  
     continue; "&Q sv-9t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2{U5*\FhVX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); co^bS;r  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `qoRnG  
   } F8xz^UQO  
  } ^mH:8_=(.  
 } To/6=$wto  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x%h4'Sm  
} W%ml/ 4  
1t+uMhy*y  
  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: L6d^e53AP  
-@7?N6~qZx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mD5Vsy{Pb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]{Y7mpdB  
<JUumrEo  
  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: c,>y1%V*S{  
{L'uuG\9U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3~q#P   
{ B*Z}=$1j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !NqLBrcv0  
 { ,FIG5-e,}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'p_|Rw>  
  SaveBmp(); tJe5`L  
  return FALSE; -HwqR Y s  
 } %Ev)Hk  
 …… //其它处理及默认处理 g)!d03Qoy  
} \jmT#Gt`9  
8I8{xt4   
z`H|]${X  
  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。 - +<ai  
>O]u4G!  
  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。 !w1 acmo<_  
=W*Ro+wWb  
  二、编程步骤 4 :phq  
4V<.:.k  
  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"; (N6=+dNY  
wY]ejK$0R  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; DX0#q #  
fJ  GwT  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; :W.pD:/=v  
\J(kevX  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; lLur.f  
T O&^%d  
  5、 添加代码,编译运行程序。 :jAsm[  
[_`<<!u>-  
三、程序代码 3qQ}U}-;|  
/H?) qk  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ep6V2R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) TH"<6*f2L  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Bx/)Sl@  
#if _MSC_VER > 1000 wwNkJ+  
#pragma once .unlr_eA  
#endif // _MSC_VER > 1000 %!7A" >ai  
#ifndef __AFXWIN_H__ |H(i)yu"5'  
#error include 'stdafx.h' before including this file for PCH ]n! oa  
#endif B?db`/G9  
#include "resource.h" // main symbols ! o?E.  
class CHookApp : public CWinApp >guX,hx^  
{ e6>[ZC  
 public: HHerL%/   
  CHookApp(); 0h kZ  
  // Overrides A4*D3\>%u  
  // ClassWizard generated virtual function overrides Z6zLL   
  //{{AFX_VIRTUAL(CHookApp) ]|N"jr?7H  
 public: cj4o[l  
  virtual BOOL InitInstance(); E#A}2|7,g  
  virtual int ExitInstance(); _&N:%;9uD  
  //}}AFX_VIRTUAL 4}Y? :R  
  //{{AFX_MSG(CHookApp) %EYh*g{G  
  // NOTE - the ClassWizard will add and remove member functions here. &p+2Vz{  
  // DO NOT EDIT what you see in these blocks of generated code ! r3Kx  
  //}}AFX_MSG Ax 4R$P.]u  
  DECLARE_MESSAGE_MAP() T-\q3X|y/  
}; o{' J O3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /eBcPu"[Vb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ? <w[ZWytm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t]{, 7.S  
BOOL InitHotkey(); a# Uk:O!  
BOOL UnInit(); J[UTn'M8]  
#endif #^_7i)=~  
F ~e}=Nb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. XM3~]  
#include "stdafx.h" (SCZ.G(>  
#include "hook.h" @.=2*e.z|b  
#include <windowsx.h> H? %I((+  
#ifdef _DEBUG bo??9 1B^7  
#define new DEBUG_NEW "HLh3L~  
#undef THIS_FILE t Kjk<  
static char THIS_FILE[] = __FILE__; uG/b Cb+V  
#endif Snq0OxS[v  
#define MAX_KEY 100 MM~4D  
#define CTRLBIT 0x04 MIu'OJ"z~  
#define ALTBIT 0x02 bWZ oGFT  
#define SHIFTBIT 0x01 _$mS=G(  
#pragma data_seg("shareddata") ]'vAeC6{  
HHOOK hHook =NULL; )"Wy/P  
UINT nHookCount =0; `uc`vkVZ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey eH9-GGr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rc}=`D`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FC4hvO(/m  
static int KeyCount =0; qvs[Gkaa@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >`n)-8  
#pragma data_seg() 9?|m ^  
HINSTANCE hins; .4!wp&  
void VerifyWindow(); ^fU,9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 618bbftx{  
//{{AFX_MSG_MAP(CHookApp) :io~{a#.2\  
// NOTE - the ClassWizard will add and remove mapping macros here. t&C0V|s79$  
// DO NOT EDIT what you see in these blocks of generated code! ;?gR,AKZ  
//}}AFX_MSG_MAP G[ q<P  
END_MESSAGE_MAP() '<wZe.Q!  
(OG>=h8?  
CHookApp::CHookApp() CelM~W$=u  
{ 5(DnE?}vo  
 // TODO: add construction code here, O_D;_v6Ii+  
 // Place all significant initialization in InitInstance s ~i,R  
} K&&YxX~ 3  
]2z Gb5s"  
CHookApp theApp; NV^n}]ci  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K14{c1  
{ OQ<NB7'n0A  
 BOOL bProcessed=FALSE; <$ %Y#I'zX  
 if(HC_ACTION==nCode) VKr oikz@]  
 { &RlYw#*1.  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8yGo\\=T  
   switch(wParam) aV n+@g<.  
   { O.?q8T)n82  
    case VK_MENU: (k %0|%eR  
     MaskBits&=~ALTBIT; L ~$&+g  
     break; H"rIOoxf  
    case VK_CONTROL: Bs-MoT!  
     MaskBits&=~CTRLBIT; ^p~3H  
     break; (!<G` ;}u  
    case VK_SHIFT: =Y R+`[bfI  
     MaskBits&=~SHIFTBIT; n(\VP!u5r  
     break; )<L?3Jjt5  
    default: //judge the key and send message "oCXG`.k&  
     break; P' k`H  
   } M-5zsN  
   for(int index=0;index<MAX_KEY;index++){ .:;#[Z{-  
    if(hCallWnd[index]==NULL) kJ0otr2P  
     continue; Rx4O?7;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ulXe;2  
    { KkZo|\V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D]Gt=2\NG9  
     bProcessed=TRUE; )eWg2w]  
    } t2z@"e   
   } ":^cb =  
  } ^^(4xHN  
  else if((lParam&0xc000ffff)==1){ //Key down Xx=.;FYk  
   switch(wParam) GnW_^$Fs  
   { 3q1u9`4;  
    case VK_MENU: V7>{,  
     MaskBits|=ALTBIT; (a8oI )~  
     break; YwF\  
    case VK_CONTROL: {q BbzBG  
     MaskBits|=CTRLBIT;  av!~B,  
     break; wEIAU  
    case VK_SHIFT: 7A>glZ/x  
     MaskBits|=SHIFTBIT; !'%`g,,r  
     break; UyOoyyd.  
    default: //judge the key and send message $@L}/MO  
     break; qo0]7m7|  
   } PciiDh~/  
   for(int index=0;index<MAX_KEY;index++) 96CC5  
   { 2<+9lk  
    if(hCallWnd[index]==NULL) h+Tt+ Q\  
     continue; f<( ysl1[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4+r26S,T  
    { J+8T Ie  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Gw Z(3  
     bProcessed=TRUE; btU:=6  
    } 2o-Ie/"d\  
   } )V*V  
  } jiAN8t*P  
  if(!bProcessed){ Yc1ve  
   for(int index=0;index<MAX_KEY;index++){ m_1BB$lyP2  
    if(hCallWnd[index]==NULL) MQGR-WV=5  
     continue; mkt%|Kb.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /bv4/P  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,(CIcDJ2U_  
   } 0~j0x#  
  } V$<5`  
 } C9FQo7   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8Dy;'BtT  
} k-\RdX)E  
}KwL_\>&f  
BOOL InitHotkey() 'x!5fAy  
{ 421ol  
 if(hHook!=NULL){ [0mg\n?  
  nHookCount++; Mi_/ ^  
  return TRUE; \py \rI  
 } m|+g_JZ  
 else Sj<WiQ%<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); gEU|Bx/!=  
  if(hHook!=NULL)  uvf}7  
   nHookCount++; O9]+Jd4W  
  return (hHook!=NULL); 4&([<gyR<  
} !5K9L(gqb  
BOOL UnInit() 9;u&,R  
{ 5m&Zq_Qe  
 if(nHookCount>1){ R7d45Wl  
  nHookCount--; ]\5?E }kd  
  return TRUE; %2D9]L2Up  
 } =%V(n{7=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $,~D-~-  
 if(unhooked==TRUE){ qA6;Q$  
  nHookCount=0; ~1v5H]T{  
  hHook=NULL; K=82fF(-  
 } Sq,x57-  
 return unhooked; Cl5l+I\1  
} ^p 4 33  
Q4,!N(>D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3ud_d>  
{ 3@/\j^U  
 BOOL bAdded=FALSE; h+7THMI  
 for(int index=0;index<MAX_KEY;index++){ gK8{=A0c  
  if(hCallWnd[index]==0){ zn'F9rWx>  
   hCallWnd[index]=hWnd; xMu[#\Vc  
   HotKey[index]=cKey; 5J4'\M  
   HotKeyMask[index]=cMask; A7qKY-4B  
   bAdded=TRUE; .v{ok,&  
   KeyCount++; o1 kY|cnGH  
   break; mew,S)dq!  
  } 9c@."O`  
 } +bw>9VmG  
 return bAdded; LJ Aqk2k  
} D-tm'APq  
RrGFGn{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MIJ^ n(-G  
{ vP{22P  
 BOOL bRemoved=FALSE; [Q2"OG@Q  
 for(int index=0;index<MAX_KEY;index++){ E9IU,P6a  
  if(hCallWnd[index]==hWnd){  bK|I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hY@rt,! 8  
    hCallWnd[index]=NULL; Io81zA  
    HotKey[index]=0; M_wj>NXZ  
    HotKeyMask[index]=0; #DI%l`B  
    bRemoved=TRUE; U- UD27  
    KeyCount--; z_^Vgb]  
    break; l$~3_3+  
   } eiV[y^?  
  } eI7FbOze  
 } i0y^b5@MOb  
 return bRemoved; uwcm%N;I"  
} Gb\Nqx(  
8AK=FX&@&  
void VerifyWindow() 0Y81B;/F  
{ #ONad0T;  
 for(int i=0;i<MAX_KEY;i++){ .W#-Cl&n8  
  if(hCallWnd!=NULL){ <B?@,S>  
   if(!IsWindow(hCallWnd)){ axSJ:j8  
    hCallWnd=NULL;  Ip0~  
    HotKey=0; Mbua!m(0  
    HotKeyMask=0; /Jjub3>Q  
    KeyCount--; .m&JRzzV  
   } t0 1@h_ WS  
  } 9BJP|L%q  
 } I0 78[3b  
} &?R2zfcM  
.S l{m[nV8  
BOOL CHookApp::InitInstance() `5V=U9zdE  
{ \<}4D\qz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); v\3:R,|'  
 hins=AfxGetInstanceHandle(); ?+]prbt)  
 InitHotkey(); Pd<s#  
 return CWinApp::InitInstance(); &p)]Cl/`  
} xpWx6  
*ydkx\pT  
int CHookApp::ExitInstance() 7<<-\7`  
{ 5,I|beM  
 VerifyWindow(); [\ M$a|K  
 UnInit(); s[ ze8:  
 return CWinApp::ExitInstance(); yM *-e m  
} @%7IZg;P6  
ET_a>]<mv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ] rP^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) N:j,9p0,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HH-A\#6J  
#if _MSC_VER > 1000 .$r=:k_d  
#pragma once )"W(0M] >  
#endif // _MSC_VER > 1000 Z r}5)ZR.  
qgT~yDm  
class CCaptureDlg : public CDialog CEwMPPYnD  
{ |,3>A@  
 // Construction TSGJ2u5ie%  
 public: g[Z$\A?ZbZ  
  BOOL bTray; uANG_sX^n  
  BOOL bRegistered; cjf 8N:4N0  
  BOOL RegisterHotkey(); i'w8Li  
  UCHAR cKey; .^aakM  
  UCHAR cMask; MM}lW-q;  
  void DeleteIcon(); *&f^R}O  
  void AddIcon();  kYls jM  
  UINT nCount; 0pO{{F  
  void SaveBmp(); T<hS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor s$cr|p;7#  
  // Dialog Data 'MM%Sm,  
  //{{AFX_DATA(CCaptureDlg) 81gcM?  
  enum { IDD = IDD_CAPTURE_DIALOG }; Mbj{C  
  CComboBox m_Key; q#{.8H-X'  
  BOOL m_bControl; vD=>AAvG  
  BOOL m_bAlt; mv5=>Xc6  
  BOOL m_bShift; +VJS/  
  CString m_Path; laR cEXj  
  CString m_Number; #Tz$ona  
  //}}AFX_DATA a.n;ika]-  
  // ClassWizard generated virtual function overrides FeW}tKH  
  //{{AFX_VIRTUAL(CCaptureDlg) @%(Vi!Cv"R  
 public: SdOa#U)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )\ `AD#  
 protected: zTgY=fuz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j20/Q)=h  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lro[ |A  
  //}}AFX_VIRTUAL |K|[>[?Z/  
  // Implementation $+ z 3  
 protected: |WiE`&?xP  
  HICON m_hIcon; hA6   
  // Generated message map functions z%)~s/2Rs  
  //{{AFX_MSG(CCaptureDlg) 1JRM@!x  
  virtual BOOL OnInitDialog(); 1V\tKDM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )\S3Q  
  afx_msg void OnPaint(); o!]muO*Rm  
  afx_msg HCURSOR OnQueryDragIcon(); QKW\z aG  
  virtual void OnCancel(); dRdI('  
  afx_msg void OnAbout(); bW]7$?acv  
  afx_msg void OnBrowse(); HE;}B!>  
  afx_msg void OnChange(); iyA=d{S;V  
 //}}AFX_MSG ~XzT~WxW  
 DECLARE_MESSAGE_MAP() L}~"R/iWCT  
}; $?_/`S13  
#endif rr@h9bak;g  
@U8}K#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I7@|{L1|FB  
#include "stdafx.h" jR1o<]?  
#include "Capture.h" J0ys Z]  
#include "CaptureDlg.h" oZD+AF$R  
#include <windowsx.h> 8t1XZ  
#pragma comment(lib,"hook.lib") S55h}5Y  
#ifdef _DEBUG \;!}z3Ww  
#define new DEBUG_NEW J?wCqA  
#undef THIS_FILE h23"<  
static char THIS_FILE[] = __FILE__; Fy; sVB  
#endif e^LjB/<Th  
#define IDM_SHELL WM_USER+1 WE{fu{x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XIGz_g;#'w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H*m3i;"4p\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~+A(zlYr~  
class CAboutDlg : public CDialog -wh?9 ?W  
{ h SeXxSb:  
 public: ?*zDsQ  
  CAboutDlg(); l&/V4V-  
  // Dialog Data GM~Ek] 9C%  
  //{{AFX_DATA(CAboutDlg) xU1_L*tu '  
  enum { IDD = IDD_ABOUTBOX }; |rgp(;iO  
  //}}AFX_DATA 3s]aXz:  
  // ClassWizard generated virtual function overrides <2n5|.:>  
  //{{AFX_VIRTUAL(CAboutDlg) ?XlPK Y  
 protected: %.h&W;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Dhe*)  
  //}}AFX_VIRTUAL >1}@Q(n/}{  
  // Implementation o2 ;  
 protected: 9-W3}4'e  
  //{{AFX_MSG(CAboutDlg) R_4eME2LB  
  //}}AFX_MSG O .ESI  
  DECLARE_MESSAGE_MAP() ]\C wa9  
}; Sl;[9l2  
2 rFjYx8D!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ] 6X;&=H  
{ t/wo G9N  
 //{{AFX_DATA_INIT(CAboutDlg) tEN8S]X  
 //}}AFX_DATA_INIT 0!Vza?9  
} aw923wEi  
~n"?*I`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O"GuVC}B  
{ Ke;eI+P[  
 CDialog::DoDataExchange(pDX); @!Z1*a.  
 //{{AFX_DATA_MAP(CAboutDlg) H|IG"JB  
 //}}AFX_DATA_MAP b9xvLR8  
} l(y,lK=YP1  
)ZW[$:wA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \ xJ_ )r  
 //{{AFX_MSG_MAP(CAboutDlg) j* ZU}Ss  
 // No message handlers yPd6{% w  
 //}}AFX_MSG_MAP 8FIk|p|l^  
END_MESSAGE_MAP() &RHZ7T  
'8yCwk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _UA|0a!-  
: CDialog(CCaptureDlg::IDD, pParent) 4 Aj<k  
{ bess b>=  
 //{{AFX_DATA_INIT(CCaptureDlg) -d.i4X3j  
  m_bControl = FALSE; O**~ Tj  
  m_bAlt = FALSE; }G)2HTaZ  
  m_bShift = FALSE; Ox5Es  
  m_Path = _T("c:\\"); *N |ak =  
  m_Number = _T("0 picture captured."); 4;bc!> sfC  
  nCount=0;  SDc8\ms  
  bRegistered=FALSE; LPeVr^  
  bTray=FALSE; 9Tg k=  
 //}}AFX_DATA_INIT l;SXR <EU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 I7#^'/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); aXyFpGdb9  
} O'Q,;s`uC  
b8 E{~z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) xHD$0eq  
{ b['v0x  
 CDialog::DoDataExchange(pDX); noso* K7  
 //{{AFX_DATA_MAP(CCaptureDlg) <])]1r8  
  DDX_Control(pDX, IDC_KEY, m_Key); |vw],r6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =.qX u+  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -@tj0OHg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8wrO64_NO  
  DDX_Text(pDX, IDC_PATH, m_Path); Bp_8PjQ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rEMe=>^   
 //}}AFX_DATA_MAP OQIr"  
} ' Tk4P{  
l>?f+70  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) HUChg{[  
//{{AFX_MSG_MAP(CCaptureDlg) <L('RgA@X  
 ON_WM_SYSCOMMAND() Uc, J+j0F  
 ON_WM_PAINT() v5 @9  
 ON_WM_QUERYDRAGICON() BM{*5Lf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >m:n6M'r  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~>H,~</`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) o-o -'0l  
//}}AFX_MSG_MAP R,s}<N$  
END_MESSAGE_MAP() |[0Ijm2  
[1Aoj|  
BOOL CCaptureDlg::OnInitDialog() I+F >^4_d  
{ !rF1Remw  
 CDialog::OnInitDialog(); (hBph+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); o`Af6C;Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); )MF 4b ][  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :-WNw n  
 if (pSysMenu != NULL) >,QCKZH  
 { '1rGsfp6In  
  CString strAboutMenu; E4'z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L]%!YP\<T  
  if (!strAboutMenu.IsEmpty()) ORM3o ucP  
  { ~"_!O+Pj  
   pSysMenu->AppendMenu(MF_SEPARATOR); A0Q`Aqs  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DK?Z   
  } 4TI`   
 } U)M&AYb  
 SetIcon(m_hIcon, TRUE); // Set big icon *fs[]q'Q  
 SetIcon(m_hIcon, FALSE); // Set small icon TNckyP75u  
 m_Key.SetCurSel(0); BNF*1JO  
 RegisterHotkey(); 6oq5CDoq  
 CMenu* pMenu=GetSystemMenu(FALSE); gj iFpW4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ACy}w?D<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >9mj/P D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]imVIu   
 return TRUE; // return TRUE unless you set the focus to a control (?g+.]Dt,  
} 4x<H=CJC  
teI?.M9r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xC9{hXg!  
{ lU%oU&P/"S  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X-X`Z`o  
 { =1k%T{>  
  CAboutDlg dlgAbout; [y}h   
  dlgAbout.DoModal(); j{'_sI{{  
 } JS/ChoU  
 else g\?v 5  
 { Lyf5Yf([-  
  CDialog::OnSysCommand(nID, lParam); t%G.i@{pkp  
 } Uf|uFGb  
} x[$KZGK+GL  
a6gPJF[Jo  
void CCaptureDlg::OnPaint() m+(g.mvK>  
{ vQp'bRR  
 if (IsIconic()) _!VtM#G[  
 { ~-[!>1!%  
  CPaintDC dc(this); // device context for painting 5Po:$(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +$#<gp"  
  // Center icon in client rectangle pKpB  
  int cxIcon = GetSystemMetrics(SM_CXICON); mQ<4(qd)  
  int cyIcon = GetSystemMetrics(SM_CYICON); .p.( \5Fo  
  CRect rect; )hl7)~S<  
  GetClientRect(&rect); O9zMD8  
  int x = (rect.Width() - cxIcon + 1) / 2; Dn@ZS_f  
  int y = (rect.Height() - cyIcon + 1) / 2; !H@HgJ -  
  // Draw the icon =+UtA f<n  
  dc.DrawIcon(x, y, m_hIcon); `"}).{N]C  
 } uY(8KW  
 else G[JWG  
 { N Uv Vhy]{  
  CDialog::OnPaint(); #rF`Hk:  
 } _WvVF*Q"k  
} J}[[tl  
maDWV&Db  
HCURSOR CCaptureDlg::OnQueryDragIcon() %gs?~Xl)]  
{ mj?Gc  
 return (HCURSOR) m_hIcon; ~;]kqYIJ  
} |1tpXpe  
i-w$-2w  
void CCaptureDlg::OnCancel() S9r?= K  
{ P9qIq]M  
 if(bTray) I*^t!+q$  
  DeleteIcon(); [*5]NNB  
  CDialog::OnCancel(); 8B &EH+  
} pDYJLh-C  
[U",yN]d  
void CCaptureDlg::OnAbout() 343d`FRa}  
{ Ihf)gfHj  
 CAboutDlg dlg; fz`)CWo:  
 dlg.DoModal(); nIr`T^c9c  
} j`"!G*Vh  
,mHUo4h1O  
void CCaptureDlg::OnBrowse() 8C8S) ;  
{ 1++g @8  
 CString str; vG'#5%,|  
 BROWSEINFO bi; jd-ccnR l  
 char name[MAX_PATH]; o+}k$i!6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I/O/*^T  
 bi.hwndOwner=GetSafeHwnd(); =f y|Dm74  
 bi.pszDisplayName=name; &PRoT#,  
 bi.lpszTitle="Select folder"; J,)ytw]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [|1I.AZ{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _J!&R:]$  
 if(idl==NULL) 2aCf?l(  
  return; jk&xzJH.  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gN />y1{a  
 str.ReleaseBuffer(); `*B0n>ol,  
 m_Path=str; d1\nMm}v  
 if(str.GetAt(str.GetLength()-1)!='\\') " (O3B  
  m_Path+="\\"; )dX(0E4Td/  
 UpdateData(FALSE); #+l`tj4b/  
} ZSK_Lux>  
RG'76?z  
void CCaptureDlg::SaveBmp() (m,H 5  
{ [ 5}Q  
 CDC dc; Nj3iZD|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); u%e~a]  
 CBitmap bm; -W1p=od  
 int Width=GetSystemMetrics(SM_CXSCREEN); j\IdB:}j  
 int Height=GetSystemMetrics(SM_CYSCREEN); ws5Ue4g|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z3hZy&_I  
 CDC tdc; _3@5@1[s  
 tdc.CreateCompatibleDC(&dc); x1#>"z7  
 CBitmap*pOld=tdc.SelectObject(&bm); Nz.X$zUmY  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Rr %x;-  
 tdc.SelectObject(pOld); )Ln".Bu,  
 BITMAP btm; ciN\SA ZY  
 bm.GetBitmap(&btm); 4>0q0}J=5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0=3)`v{S@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X>=`l)ZR  
 BITMAPINFOHEADER bih; p__wBUB  
 bih.biBitCount=btm.bmBitsPixel; ceE]^X;p  
 bih.biClrImportant=0; G2kU_  
 bih.biClrUsed=0; M)+pH  
 bih.biCompression=0; ^_|kEvk0  
 bih.biHeight=btm.bmHeight; Jg[Ao#,==  
 bih.biPlanes=1; =/46;844T  
 bih.biSize=sizeof(BITMAPINFOHEADER); X2Z)> 10  
 bih.biSizeImage=size; CUI+@|]%  
 bih.biWidth=btm.bmWidth; _ C?Wk:Y@  
 bih.biXPelsPerMeter=0; i cTpx#|=  
 bih.biYPelsPerMeter=0; MXcW & b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x+Xd7N1  
 static int filecount=0; XP?jsBE  
 CString name; 0?>(H(D^/  
 name.Format("pict%04d.bmp",filecount++); zq{UkoME  
 name=m_Path+name; I_v}}h{  
 BITMAPFILEHEADER bfh; &N/t%q  
 bfh.bfReserved1=bfh.bfReserved2=0; ?=M ?v;8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4)8VmCW  
 bfh.bfSize=54+size; i^%$ydg  
 bfh.bfOffBits=54; (^ EuF]  
 CFile bf; I* C~w  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rMxIujx  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ulIEx~qP  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A,DBq9Z+4R  
  bf.WriteHuge(lpData,size); D1xGUz2r  
  bf.Close(); ]qv0Y~+`-K  
  nCount++; b^d{$eoH?|  
 } H"l4b4)N\  
 GlobalFreePtr(lpData);  rvd $4l^  
 if(nCount==1) 950N\Y @u  
  m_Number.Format("%d picture captured.",nCount); %|(c?`2|  
 else WsV"`ij#  
  m_Number.Format("%d pictures captured.",nCount); tn' Jkwp  
  UpdateData(FALSE); 70c]|5  
} lJu^Bcrv  
7amVnR1f  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |cma7q}p  
{ OY`B{jV-  
 if(pMsg -> message == WM_KEYDOWN) KN|<yF   
 { }<A.zwB<i  
  if(pMsg -> wParam == VK_ESCAPE) Cr7Zi>sd<!  
   return TRUE; 6^] |  
  if(pMsg -> wParam == VK_RETURN) <@-O 06  
   return TRUE; 8O,\8:I#  
 } Q p>b  
 return CDialog::PreTranslateMessage(pMsg); ):! =XhQ  
} R}Lk$#S#  
>J:=)1`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /=/Ki%hh  
{ @=VxW U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M-"j8:en  
  SaveBmp(); LN5LT'CE   
  return FALSE; `sYFQ+D#O  
} M@A3+ v%K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ aDNB~CwZZ  
 CMenu pop; ;yt6Yp.6e  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?N<My& E  
 CMenu*pMenu=pop.GetSubMenu(0); ;9T}h2^`B  
 pMenu->SetDefaultItem(ID_EXITICON); %f1%9YH  
 CPoint pt;  h$l/wn  
 GetCursorPos(&pt); }%jF!d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R#d~a;j  
 if(id==ID_EXITICON) Zok{ndO@|f  
  DeleteIcon(); ={:a N)  
 else if(id==ID_EXIT) .Ix3wR9  
  OnCancel(); X=$Jp.  
 return FALSE; _AX 9 Mu]  
} `Y?VQ~ci>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n(F!t,S1i  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) r.H`3m.0q  
 AddIcon(); )r9 9zdUk  
 return res; !uEEuD#  
} BY6#dlDi  
o]e,5]  
void CCaptureDlg::AddIcon() lnZ{Ryo(  
{ 5.~Je6K U  
 NOTIFYICONDATA data; '8X>,un  
 data.cbSize=sizeof(NOTIFYICONDATA); 1VX3pkUET  
 CString tip; ~wb1sn3  
 tip.LoadString(IDS_ICONTIP); v03cQw\"WE  
 data.hIcon=GetIcon(0); 6$k#B ~~  
 data.hWnd=GetSafeHwnd(); EMmgX*iu@  
 strcpy(data.szTip,tip); p'/\eBhG]=  
 data.uCallbackMessage=IDM_SHELL; At(88(y-W  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )5Khl"6!z  
 data.uID=98; \3 SY2g8+  
 Shell_NotifyIcon(NIM_ADD,&data); ?gE=hh  
 ShowWindow(SW_HIDE); RPz[3y  
 bTray=TRUE; ]nTeTW  
} <,]:jgX  
JtL> mH  
void CCaptureDlg::DeleteIcon() Pp8S\%z~h  
{ Js,!G  
 NOTIFYICONDATA data; p27Dc wov  
 data.cbSize=sizeof(NOTIFYICONDATA); )O1]|r7v  
 data.hWnd=GetSafeHwnd(); i1 E|lp)  
 data.uID=98; #aP#r4$  
 Shell_NotifyIcon(NIM_DELETE,&data); P>7Xbm,VP  
 ShowWindow(SW_SHOW); x>#{C,Fi  
 SetForegroundWindow(); W>@ti9\t  
 ShowWindow(SW_SHOWNORMAL); jdxHWkQ   
 bTray=FALSE; TrjyU  
} =A"Abmx|  
xE1?)  
void CCaptureDlg::OnChange() bwsKdh  
{ mk>; 3m*  
 RegisterHotkey(); RaJTya^  
} v ccH(T  
hhTtxC<:  
BOOL CCaptureDlg::RegisterHotkey() E=sh^Q(A  
{ TjW!-s?S  
 UpdateData(); `fBQ?[05.  
 UCHAR mask=0; 5PeS/%uT@  
 UCHAR key=0; ;,4*uU'vq  
 if(m_bControl) smn"]K  
  mask|=4; MpCPY"WLL  
 if(m_bAlt) X{-4w([  
  mask|=2;  s5VK  
 if(m_bShift) L< F8+a7i  
  mask|=1; E'AR.!  
  key=Key_Table[m_Key.GetCurSel()]; CsO!Y\'FY  
 if(bRegistered){ Y+?QHtZL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q"QRF5Ue  
  bRegistered=FALSE; ewMVUq*:  
 } F]$ Nu  
 cMask=mask; 37U8<  
 cKey=key; ]>n{~4a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @ st>#]i4  
 return bRegistered; [?]N GTr#  
} 7H7 Xbi@  
6$`<Y?  
  四、小结 [EAOk=X  
_jQ:9,; A  
  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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