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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: p-o8Ctc?V  
  "pInb5F  
  一、实现方法 fuQk}OW{  
Hq;*T3E  
  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: UrRYK-g  
h7a/]~  
#pragma data_seg("shareddata") w =2; QJ<  
HHOOK hHook =NULL; //钩子句柄 ;Zt N9l  
UINT nHookCount =0; //挂接的程序数目 fG_<HJS(~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?l>Ra0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 rf=oH }  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %+ : $uk[  
static int KeyCount =0; >*]dB|2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yE_T#FN  
#pragma data_seg() UY}EW`$#m  
\TS.9 >\  
  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。 /)*si  
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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: Min {&?a  
"%rzL.</  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8I]rC<O6:  
cKey,UCHAR cMask) VoC|z Rd_  
{ | <bZ*7G  
 BOOL bAdded=FALSE; Q79WGW  
 for(int index=0;index<MAX_KEY;index++){ 8JojKH  
  if(hCallWnd[index]==0){ +|6E~#zklY  
   hCallWnd[index]=hWnd; }Dx5W9Ri"  
   HotKey[index]=cKey; fJK;[*&Y  
   HotKeyMask[index]=cMask; #9rCF 3P  
   bAdded=TRUE; #B6$ r/%  
   KeyCount++; +#Ga} e CM  
   break; KSve_CBOh  
  } 6ee1^>  
 } f7?u`"C  
 return bAdded; = J0r,dR  
} f64}#E|w  
//删除热键 E^C [G)7n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `1i\8s&O6@  
{ <~hx ~"c  
 BOOL bRemoved=FALSE; Q6$^lRNOpk  
 for(int index=0;index<MAX_KEY;index++){ #}+_Hy  
  if(hCallWnd[index]==hWnd){ ?.g="{5X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RV>n Op}R  
    hCallWnd[index]=NULL; ? ]H'egG6  
    HotKey[index]=0; X3j|J/  
    HotKeyMask[index]=0; [!j;jlh7},  
    bRemoved=TRUE; =l4F/?u]f@  
    KeyCount--; Z5`U+ (  
    break; S;}/ql y  
   } BmFtRbR  
  } ^0(`:*  
 } q rF:=?`E  
 return bRemoved; xgJyG.?  
} p?#xd!tc2N  
/xb37,   
gJg%3K~,  
  DLL中的钩子函数如下: I|tn7|*-A[  
S #C;"se  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 50^CILKo7  
{ A"wso[{  
 BOOL bProcessed=FALSE; SN5Z@kK  
 if(HC_ACTION==nCode) *qKf!&  
 { =zRjb>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q@d6P~[-gj  
   switch(wParam) :MILOwF  
   {  6.M!WK{+  
    case VK_MENU: ch)#NHZ9F  
     MaskBits&=~ALTBIT; DcsQ6  
     break; ',s{N9  
    case VK_CONTROL: 6)1xjE#  
     MaskBits&=~CTRLBIT; .#_g.0<  
     break; uz@lz +  
    case VK_SHIFT: 4`p[t;q  
     MaskBits&=~SHIFTBIT; {PkPKp  
     break; I@uin|X  
    default: //judge the key and send message ,A9{x\1!  
     break; l<p6zD$l  
   } &t@|/~%[  
   for(int index=0;index<MAX_KEY;index++){ t<yOTVah  
    if(hCallWnd[index]==NULL) 6Z!OD(/e  
     continue; rp!>rM] s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V&R_A~<T  
    { fvM|Jb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4~e6z(  
     bProcessed=TRUE; gx=2]~O1(  
    } NBO&VYs|  
   } eXCH*vZY  
  } bdyIt)tK+  
  else if((lParam&0xc000ffff)==1){ //有键按下 @\Yu?_a  
   switch(wParam) XB+Juk&d  
   { V]|P>>`v9p  
    case VK_MENU: ^fhkWx4i  
     MaskBits|=ALTBIT; .] BJM?9  
     break; LLJsBHi-  
    case VK_CONTROL: cxxrvP-  
     MaskBits|=CTRLBIT; ^w~Utx4  
     break; a*?,wmzl  
    case VK_SHIFT: =aRE  
     MaskBits|=SHIFTBIT; 4fau 9bW  
     break; |r/4 ({n  
    default: //judge the key and send message \q:PU6q  
     break; }tPI#[cfK  
   } F}4jm,w  
   for(int index=0;index<MAX_KEY;index++){ gg QI  
    if(hCallWnd[index]==NULL) htHnQ4Q  
     continue; ZJ}|t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "uD^1'IW2  
    { Zl7m:b2M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _.BX#BIF  
     bProcessed=TRUE; uDG#L6  
    }  `AxhA.&V  
   } :\,3=suWq  
  } X-J<gI(Y  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Ng1uJa[k!d  
   for(int index=0;index<MAX_KEY;index++){ XkuZ2(  
    if(hCallWnd[index]==NULL) yWZ%|K~$  
     continue; qb$f,E[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j~`rc2n%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =@go;,"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 KHt.g`1:R  
   } `+EjmY  
  } pYaq1_<+  
 } YJ~3eZQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qJLtqv  
} pax;#*QcQ  
C]DvoJmBs  
  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: @G0j/@v  
uNG?`>4>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 16n8[U!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [9xUMX^}  
EFS2 zU  
  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: 3NC-)S  
(f?&zQ!+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L\y>WR%s  
{ 2?nhkast#=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;c;PNihg  
 { yXL]uh#b  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PH3#\ v.   
  SaveBmp(); 9|RR;k[  
  return FALSE; $.-\2;U  
 } 1U< g  
 …… //其它处理及默认处理 "+:~#&r  
} 5b-: e? |  
m\?H < o0  
Jp]eFaqp  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 7cMSJM(]G  
PK|"+I0  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Ae 3:"  
xk$U+8K  
  二、编程步骤 cG~-OHU  
H}B%OFI\+  
  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"; 1VC:o]$  
q/HwcX+[b  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mo- Y %  
iLD:}yK  
  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; &ZUV=q%g9n  
& !I$  
  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; 5rx;?yvn  
sy;_%,}N  
  5、 添加代码,编译运行程序。 c;pv< lX'  
6_h'0~3?`  
三、程序代码 O6$d@r;EK]  
fG*366W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m6oaO9"K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) l gzA) (  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p2: >m\  
#if _MSC_VER > 1000 ,wE cRN w  
#pragma once JM-+p  
#endif // _MSC_VER > 1000 wA;Cj  
#ifndef __AFXWIN_H__ (5(TbyWwD  
#error include 'stdafx.h' before including this file for PCH 9akIu.H  
#endif _r&,n\ T  
#include "resource.h" // main symbols !*@sX7H  
class CHookApp : public CWinApp xf]_@T;  
{ a@&P\"k  
 public: 8Mf{6&F=  
  CHookApp(); y}t1r |p  
  // Overrides hbg:}R=B<  
  // ClassWizard generated virtual function overrides $D)Ajd;  
  //{{AFX_VIRTUAL(CHookApp) MF["-GvP/  
 public: oyeJ"E2  
  virtual BOOL InitInstance(); 4]18=?r>  
  virtual int ExitInstance(); Dw6mSsC/  
  //}}AFX_VIRTUAL _wKaFf  
  //{{AFX_MSG(CHookApp) oe{K0.`  
  // NOTE - the ClassWizard will add and remove member functions here. nVt,= ?_ U  
  // DO NOT EDIT what you see in these blocks of generated code ! aEW sru  
  //}}AFX_MSG M$0-!$RY  
  DECLARE_MESSAGE_MAP()  F6\Hqv  
}; QFtf.")[.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <4|/AF*>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mWPA]g(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l@OY8z-_  
BOOL InitHotkey(); - .EH?{i  
BOOL UnInit(); <yHa[c`L  
#endif 3/i_?G  
)IH|S5mG?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `oq][|  
#include "stdafx.h" ~!& "b1  
#include "hook.h" }[gk9uM_7  
#include <windowsx.h> ecRY,MN  
#ifdef _DEBUG #{BHH;J+  
#define new DEBUG_NEW J>XMaI})U  
#undef THIS_FILE d^sm;f  
static char THIS_FILE[] = __FILE__; %2jRJ  
#endif *lT:P-  
#define MAX_KEY 100 }; ;Thfd  
#define CTRLBIT 0x04 A3 |hFk  
#define ALTBIT 0x02 :_f5(N*{5o  
#define SHIFTBIT 0x01 \6)]!$F6:  
#pragma data_seg("shareddata") GZwz4=`  
HHOOK hHook =NULL; (6Tvu5*4U  
UINT nHookCount =0; NB|yLkoDyI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Oe/\@f0bLT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ' M'k$G@Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2`;&Uwt  
static int KeyCount =0; C@3`n;yZ=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F?B`rw@xr  
#pragma data_seg() $ rU"Krf67  
HINSTANCE hins; 1\aJ[t  
void VerifyWindow(); %7y8a`}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) zG. \xmp  
//{{AFX_MSG_MAP(CHookApp) vk&6L%_~a  
// NOTE - the ClassWizard will add and remove mapping macros here. ym =7EY?o  
// DO NOT EDIT what you see in these blocks of generated code! Y%1 94fY$  
//}}AFX_MSG_MAP -0>gq$/N=^  
END_MESSAGE_MAP() +338z<'Z!  
}@XokRk  
CHookApp::CHookApp() JE<w7:R&  
{ Sbp].3^j  
 // TODO: add construction code here,  UqwU3  
 // Place all significant initialization in InitInstance CVy\']  
} nde_%d$  
W Y]   
CHookApp theApp; <Cbi5DtR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NrK.DY4  
{ Y*Ra!]62  
 BOOL bProcessed=FALSE; ls*bCe  
 if(HC_ACTION==nCode) H6t'V%Ys  
 { -+ha4JOB  
  if((lParam&0xc0000000)==0xc0000000){// Key up \~!!h.xR  
   switch(wParam) TF1,7Qd  
   { ^tTASK  
    case VK_MENU: ~EL3I  
     MaskBits&=~ALTBIT; MOia] 5  
     break; =G,wR'M  
    case VK_CONTROL: !K[UJQ s\  
     MaskBits&=~CTRLBIT; <9bfX 91  
     break; pRys 5/&v  
    case VK_SHIFT: LpYG!Kl  
     MaskBits&=~SHIFTBIT; {TL.2  
     break; 6Lb(oY}\3  
    default: //judge the key and send message ?XIB\7}  
     break; ~9[O'  
   } Ht9QINo  
   for(int index=0;index<MAX_KEY;index++){ K8bKTG\  
    if(hCallWnd[index]==NULL) =f/CBYNw@V  
     continue; 0;Oe&Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xk*&zAt  
    { S T1V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QHDR* tB:{  
     bProcessed=TRUE; 6Lc{SR  
    } yt@7l]I  
   } ?`lD|~  
  } \5iMr[s  
  else if((lParam&0xc000ffff)==1){ //Key down RH}i=  
   switch(wParam) {U'\2Ge<m  
   { ;0vCZaEF  
    case VK_MENU: L~+/LV  
     MaskBits|=ALTBIT; \}Al85  
     break; hl]q6ZK!6  
    case VK_CONTROL: /wI"oHZd  
     MaskBits|=CTRLBIT; K2> CR$L  
     break; { )-8P  
    case VK_SHIFT: 4=~+B z  
     MaskBits|=SHIFTBIT; n "bii7h  
     break; ?Qxf~,F  
    default: //judge the key and send message KcvstC`  
     break; 2Onp{,'}  
   } vR3\E"Zi  
   for(int index=0;index<MAX_KEY;index++) f OasX!=  
   { IE|? &O  
    if(hCallWnd[index]==NULL) %b[>eIJU#  
     continue; Xwo%DZKN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;=p3L<~c`K  
    { ![i)_XO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $*Kr4vh  
     bProcessed=TRUE; KTq+JT u  
    } 6Hp+?mmh  
   } jNvDE}'  
  } ?o6X_UxW!  
  if(!bProcessed){ {vq| 0t\-  
   for(int index=0;index<MAX_KEY;index++){ Rb!y(&>v  
    if(hCallWnd[index]==NULL) F )Iz:  
     continue; 9Vru,7g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) U4.$o ]58  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4`B3Kt`o  
   } _ a#k3r  
  } } J[Z)u  
 } 4_`(c1oA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UCt}\IJ  
} /go|r '  
6CCm1F{`  
BOOL InitHotkey() AP1&TQ,&  
{ %s! |,Cu  
 if(hHook!=NULL){ `Gj(>z*  
  nHookCount++; dEZUK vo  
  return TRUE; lrAhdi  
 } ]|-sZ<?<i  
 else '451H3LC0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fX.1=BjXi  
  if(hHook!=NULL)  k^Q.lb {  
   nHookCount++; Vu,e ]@  
  return (hHook!=NULL); .ht-*  
} E<jW; trt_  
BOOL UnInit() <2E|URo,#  
{ _U_O0@xi  
 if(nHookCount>1){ !Ii[`H  
  nHookCount--; kH5D%`Kw  
  return TRUE; 31~nay15  
 } :h(` eC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )q66^% ;S  
 if(unhooked==TRUE){ 35Yf,@VO  
  nHookCount=0; s+?2oPa  
  hHook=NULL; gBky ZK  
 } n y cn  
 return unhooked; <iA\ZS:  
} W=#AfPi$&  
}v's>Ae~p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2Rt6)hgY  
{ Khb Ku0Z  
 BOOL bAdded=FALSE; AhD C5ue=  
 for(int index=0;index<MAX_KEY;index++){ jU $G<G  
  if(hCallWnd[index]==0){ sH.=Faos  
   hCallWnd[index]=hWnd; _jc_(;KPF  
   HotKey[index]=cKey; V)5K/ U{  
   HotKeyMask[index]=cMask; rlaeqG  
   bAdded=TRUE; W6Mq:?+D  
   KeyCount++; '4nJ*Xa  
   break; D#AqZS>B  
  } Q~tXT_  
 } m8=n`XI  
 return bAdded; 0,nz*UDk  
} - V:HT j  
,3!$mQL=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *E*oWb]H  
{ _1NK9dp:  
 BOOL bRemoved=FALSE; vQ L$.A3>  
 for(int index=0;index<MAX_KEY;index++){ LFI#wGhXVk  
  if(hCallWnd[index]==hWnd){ l>MDCqV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HhL;64OYa  
    hCallWnd[index]=NULL; {#ynN`tLyF  
    HotKey[index]=0; 0$]iRE;O]  
    HotKeyMask[index]=0; R{fJ"Q5'  
    bRemoved=TRUE; jQ,Vs=*H  
    KeyCount--; Kxch.$hc,  
    break; V"Z8-u  
   } n m<?oI*\  
  } ~ ;LzTL  
 } P`ou:M{8  
 return bRemoved; . %s U)$bH  
} ~ney~Pz_  
xZP*%yM  
void VerifyWindow() 4Wp5[(bg  
{ SIV !8mz  
 for(int i=0;i<MAX_KEY;i++){ KW(a@X  
  if(hCallWnd!=NULL){ 0|RofL&o  
   if(!IsWindow(hCallWnd)){ wS);KLe3  
    hCallWnd=NULL; CVW T >M<  
    HotKey=0; r|=1{N x  
    HotKeyMask=0; ."H;bfcL_  
    KeyCount--; bx(@ fl:m  
   } 8[KKi~A  
  } 58Ce>*~  
 } ov,|`FdU^T  
} y-db CYMc  
{$,\Qg  
BOOL CHookApp::InitInstance() t|$ jgM  
{ $8)XN-%(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); P&uSh?[ ^  
 hins=AfxGetInstanceHandle(); )-26(aNGT  
 InitHotkey(); Rh ^(91d  
 return CWinApp::InitInstance(); H.m]Dm,z  
} !JDr58  
;U|(rM;  
int CHookApp::ExitInstance() $uZmIu9Bi+  
{ `R$i|,9 )  
 VerifyWindow(); CtXbAcN2B  
 UnInit(); V6X )L>!xx  
 return CWinApp::ExitInstance(); '< U&8?S  
} Cjx4vP  
O|V0WiY<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !,$#i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7ocUFY0"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Qz,2PO  
#if _MSC_VER > 1000 8i154#l+\  
#pragma once dMH_:jb  
#endif // _MSC_VER > 1000 GLn=*Dh#  
(T_-`N|  
class CCaptureDlg : public CDialog >`\.i,X .D  
{ zak\%yY`  
 // Construction bGCC?}\  
 public: ==OUd6e}  
  BOOL bTray; /)6T>/  
  BOOL bRegistered; &t[[4+Qt  
  BOOL RegisterHotkey(); :$$~$P  
  UCHAR cKey; nbF<K?  
  UCHAR cMask; ~;3yjO)l?)  
  void DeleteIcon(); z'U.}27&o  
  void AddIcon(); vN'+5*Cgy6  
  UINT nCount; 8YFG*HSa  
  void SaveBmp(); XI\Slq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %):_  
  // Dialog Data ?> }p'{I  
  //{{AFX_DATA(CCaptureDlg) Nvgi&iBh8  
  enum { IDD = IDD_CAPTURE_DIALOG }; i%-yR DIX  
  CComboBox m_Key; Q>,&@  
  BOOL m_bControl; z2iMpZ  
  BOOL m_bAlt; (oG YnN,2  
  BOOL m_bShift; xoKK{&J  
  CString m_Path; Byc;r-Q5V  
  CString m_Number; J'}+0mln  
  //}}AFX_DATA k( :Bl  
  // ClassWizard generated virtual function overrides rLsY_7!  
  //{{AFX_VIRTUAL(CCaptureDlg) E`o_R=%  
 public: /_0B5 ,6R  
  virtual BOOL PreTranslateMessage(MSG* pMsg); iT}>a30]B  
 protected: R iLl\S#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '#7k9\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); QPVi& *8_  
  //}}AFX_VIRTUAL N4vcd=uG#  
  // Implementation EB}B75)x  
 protected: a;xeHbE  
  HICON m_hIcon; CP J21^  
  // Generated message map functions ;k!.ey $S  
  //{{AFX_MSG(CCaptureDlg) Kk8wlC  
  virtual BOOL OnInitDialog(); 8"j$=T6;W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c["1t1G  
  afx_msg void OnPaint(); q[\3,Y  
  afx_msg HCURSOR OnQueryDragIcon(); ,^([aK  
  virtual void OnCancel(); pG#tMec  
  afx_msg void OnAbout(); _ LHbP=B  
  afx_msg void OnBrowse(); ku5|cF*%  
  afx_msg void OnChange(); Cw,a)XB  
 //}}AFX_MSG G'\[dwD,u  
 DECLARE_MESSAGE_MAP() yv4x.cfI2W  
}; \6|y~5Hw{r  
#endif gy}3ZA*F  
,Vi_~b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rRRh-%.RU  
#include "stdafx.h" y|| n9  
#include "Capture.h" 9i\RdJv.  
#include "CaptureDlg.h" 6\.g,>   
#include <windowsx.h> kH eD(Ea  
#pragma comment(lib,"hook.lib") j2D!=PK;  
#ifdef _DEBUG  p& _Z}Wv  
#define new DEBUG_NEW JTKS5 r7?  
#undef THIS_FILE 05 6K)E  
static char THIS_FILE[] = __FILE__; 5nx*D"  
#endif epsRv&LfC  
#define IDM_SHELL WM_USER+1 KNeVSZT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h>`[p,o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H1k)ya x4_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -s 0SQe{!_  
class CAboutDlg : public CDialog %@PcQJg U<  
{ N/o?\q8  
 public: dHY@V> D'-  
  CAboutDlg(); PA^*|^;Xh  
  // Dialog Data QZVyU8j3  
  //{{AFX_DATA(CAboutDlg) HIc;Lc8$  
  enum { IDD = IDD_ABOUTBOX }; nGVr\u9z  
  //}}AFX_DATA 7KlL%\  
  // ClassWizard generated virtual function overrides 8'Q+%{?1t  
  //{{AFX_VIRTUAL(CAboutDlg) XZOBK^,5^B  
 protected: C1;uAw?\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <9]"p2  
  //}}AFX_VIRTUAL jA,y.(mR  
  // Implementation m~+.vk  
 protected: r ~{nlLO}  
  //{{AFX_MSG(CAboutDlg) "q?(rx;  
  //}}AFX_MSG 5$U49j  
  DECLARE_MESSAGE_MAP() <#:iltO  
}; oO tjG3B({  
&E]) sJ0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;-1KPDIp`  
{ dzIBdth  
 //{{AFX_DATA_INIT(CAboutDlg) < dE7+w  
 //}}AFX_DATA_INIT  c k;:84  
} (Iv@SiZf(  
~aotV1"D  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #X)DFAtb  
{ 9BakxmAc  
 CDialog::DoDataExchange(pDX); ,O:4[M!$w  
 //{{AFX_DATA_MAP(CAboutDlg) ()|e xWW  
 //}}AFX_DATA_MAP XI Mh<  
} :7(fBf5  
Sqp91[,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L[zTT\a  
 //{{AFX_MSG_MAP(CAboutDlg) S_sHwObFu|  
 // No message handlers >(2;(TbQm0  
 //}}AFX_MSG_MAP q}_8iDO6  
END_MESSAGE_MAP() OkRb3}  
2po8n _  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EZWWv L  
: CDialog(CCaptureDlg::IDD, pParent) +IXr4M&3  
{ Ls2,+yo]>  
 //{{AFX_DATA_INIT(CCaptureDlg) Idu'+O4  
  m_bControl = FALSE; eV_ ",W  
  m_bAlt = FALSE; LiEEQ  
  m_bShift = FALSE; <RxxGD  
  m_Path = _T("c:\\"); 9+(b7L   
  m_Number = _T("0 picture captured."); %{ U (y#  
  nCount=0; @^0}wk  
  bRegistered=FALSE; !v3d:n\W8  
  bTray=FALSE; |$tF{\  
 //}}AFX_DATA_INIT 6<z#*`U1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jXx~ 5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /\fR6|tJ  
} sB0]lj-[Un  
fbI5!i#lz  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iw.F8[})  
{ ;- i)}<  
 CDialog::DoDataExchange(pDX); ~I")-2"B  
 //{{AFX_DATA_MAP(CCaptureDlg) h/5V~ :)  
  DDX_Control(pDX, IDC_KEY, m_Key); ZXhNn<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); vmxS^_I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^E, #}cW  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *[>{ 9V  
  DDX_Text(pDX, IDC_PATH, m_Path); ~&,S xQT  
  DDX_Text(pDX, IDC_NUMBER, m_Number); m!INbIh  
 //}}AFX_DATA_MAP h9d*N9!;M  
} Urw =a$  
#+i5'p(4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5aVZ"h"  
//{{AFX_MSG_MAP(CCaptureDlg) ?z.  Z_A&  
 ON_WM_SYSCOMMAND() Z{u]qI{l  
 ON_WM_PAINT() `m V(:  
 ON_WM_QUERYDRAGICON() DFwiBB6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b 2\J<Nw  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eLH=PDdO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) A _7I0^  
//}}AFX_MSG_MAP `MT.<5H  
END_MESSAGE_MAP() P{RGW.Ci@  
k(`>(w  
BOOL CCaptureDlg::OnInitDialog()  de8xl  
{ >8NUji2I  
 CDialog::OnInitDialog(); S!-t{Q+j^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O>*Vo!z\f  
 ASSERT(IDM_ABOUTBOX < 0xF000); *"jlsI  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p*jH5h cy  
 if (pSysMenu != NULL) ,*[N_[  
 { ^K<!`B  
  CString strAboutMenu; fG?a"6~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); lNe5{'OrO  
  if (!strAboutMenu.IsEmpty()) "Z';nmv'N  
  { f. h3:_r  
   pSysMenu->AppendMenu(MF_SEPARATOR); $U&p&pgH=W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .' v$PEy  
  } nr>Yj?la  
 } 0#5&*  
 SetIcon(m_hIcon, TRUE); // Set big icon ZXj*Vu$_4  
 SetIcon(m_hIcon, FALSE); // Set small icon -f'&JwE0=  
 m_Key.SetCurSel(0); MO1H?U hx  
 RegisterHotkey(); =BD |uIR  
 CMenu* pMenu=GetSystemMenu(FALSE); RP^L.X(7^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eiA$) rzy  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?`:+SncI"b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M)v='O<H8  
 return TRUE; // return TRUE unless you set the focus to a control ,=pn}\ R  
} fHuWBC_YO  
un`4q-S7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) e6y!,My<  
{ Dl?:Mh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #T>pu/EQX_  
 { kB?Uw#  
  CAboutDlg dlgAbout; ZKS]BbMZa  
  dlgAbout.DoModal(); WK#c* rsij  
 } ),,0T/69+9  
 else y2B'0l  
 { s=R^2;^  
  CDialog::OnSysCommand(nID, lParam); OSJL,F,  
 } Cpn!}!Gnf  
} oB<!U%BN  
l >oJ^J  
void CCaptureDlg::OnPaint() ?wIw$p>wT  
{ )|]*"yf:E  
 if (IsIconic()) nWd;XR6|  
 { z@<jZM  
  CPaintDC dc(this); // device context for painting {H=<5   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1#zD7b~  
  // Center icon in client rectangle i\>?b)a>  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^= kr`5  
  int cyIcon = GetSystemMetrics(SM_CYICON); '~{kR=+  
  CRect rect; Nah\4-75&  
  GetClientRect(&rect); 8yswi[  
  int x = (rect.Width() - cxIcon + 1) / 2; hBDmC_\~  
  int y = (rect.Height() - cyIcon + 1) / 2; !%D;H~mQ  
  // Draw the icon $m-@ICG#  
  dc.DrawIcon(x, y, m_hIcon); =QwT)KRB%  
 } dA#'HMh@  
 else Nc^:v/(P  
 { }+:X=@Z@  
  CDialog::OnPaint(); 7Zft]C?|@  
 } @6y)wA9Yx  
} 7<*g'6JG[  
|lIgvHgg  
HCURSOR CCaptureDlg::OnQueryDragIcon() NiVZ=wEp,  
{ 5z.Y}  
 return (HCURSOR) m_hIcon; Xag#ZT  
} u`*1OqU  
0 \1g-kc!v  
void CCaptureDlg::OnCancel() S""F58 H n  
{ bhKe"#m|S  
 if(bTray) wEl/s P  
  DeleteIcon(); B?d+^sz]  
  CDialog::OnCancel(); ; Yt'$D*CP  
} SO`b+B  
AgOti]`aR  
void CCaptureDlg::OnAbout() C)cuy7<  
{ i2 )$%M&  
 CAboutDlg dlg; K;R!>p}t  
 dlg.DoModal(); rwpH9\GE  
} :?gp}.  
t&o&gb  
void CCaptureDlg::OnBrowse() aC3Qmo6?m  
{ P(p|NRD@1  
 CString str; Nm#[A4  
 BROWSEINFO bi; Jn\>S z(96  
 char name[MAX_PATH]; N8*QAe kN  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); m&- -$sr  
 bi.hwndOwner=GetSafeHwnd(); qjN*oM,  
 bi.pszDisplayName=name; ;YrmT9Jx6  
 bi.lpszTitle="Select folder"; fKkS_c 2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $L72%T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); C5TC@w1*  
 if(idl==NULL) |4Os_*tRKU  
  return;  {T5u"U4  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }(#;{_  
 str.ReleaseBuffer(); F ^)( 7}ph  
 m_Path=str; -{p~sRc&  
 if(str.GetAt(str.GetLength()-1)!='\\') 5[`f(;  
  m_Path+="\\"; G4EuW *~  
 UpdateData(FALSE); dlDO?T  
} [n$6 T  
&3 x [0DV  
void CCaptureDlg::SaveBmp() K*tomy  
{ xE6hE'rh.O  
 CDC dc; \ Ju7.3.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); we33GMxHl`  
 CBitmap bm; u"U7aYGkY  
 int Width=GetSystemMetrics(SM_CXSCREEN); ' $"RQ=  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5C5OLAl v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !wo  
 CDC tdc; G9~ 4?v6:  
 tdc.CreateCompatibleDC(&dc); /!pJ"@  
 CBitmap*pOld=tdc.SelectObject(&bm); \[]4rXZN0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); kq> I?wg  
 tdc.SelectObject(pOld); L1MG("R  
 BITMAP btm; 3#{Al[jq  
 bm.GetBitmap(&btm); 5>fAO =u!Q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tf>"fU\P  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 55zy]|F"  
 BITMAPINFOHEADER bih; ? RI D4xu!  
 bih.biBitCount=btm.bmBitsPixel; z7HM/<WY  
 bih.biClrImportant=0; ugs9>`fF&  
 bih.biClrUsed=0; L1QDA}6?_Y  
 bih.biCompression=0; $OaxetPH  
 bih.biHeight=btm.bmHeight; {Lsl2@22  
 bih.biPlanes=1; p<\7" SB=  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,HK-mAH   
 bih.biSizeImage=size; ]}9[ys  
 bih.biWidth=btm.bmWidth; ^K:-r !v^  
 bih.biXPelsPerMeter=0; ,-SWrp`f  
 bih.biYPelsPerMeter=0; \$xj>b;  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); YLb$/6gj6  
 static int filecount=0; Oh,]"(+  
 CString name; +?6@%mW'  
 name.Format("pict%04d.bmp",filecount++); Bk/&H-NI  
 name=m_Path+name; Fzy5k?R  
 BITMAPFILEHEADER bfh; bg^ <e}{<H  
 bfh.bfReserved1=bfh.bfReserved2=0; jaQH1^~l/-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2~%^ y6lR  
 bfh.bfSize=54+size; *_K*GCy  
 bfh.bfOffBits=54; C~04#z_$  
 CFile bf; A(+%DZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1H8/b D  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q6xA@"GJ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [$ z-  
  bf.WriteHuge(lpData,size); )h0b}HMW)  
  bf.Close(); +77B656  
  nCount++; I M G^L  
 } NJg )S2]7  
 GlobalFreePtr(lpData); 4-oaq'//BT  
 if(nCount==1) x !n8Wx  
  m_Number.Format("%d picture captured.",nCount); k\-h-0[|  
 else HmbQL2  
  m_Number.Format("%d pictures captured.",nCount); $#E!/vVwD7  
  UpdateData(FALSE); N{uVh;_  
} plM:7#eA  
s133N?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0xfF  
{ 7\yh<?`V8  
 if(pMsg -> message == WM_KEYDOWN) k +Cwnp  
 { &"^U=f@v  
  if(pMsg -> wParam == VK_ESCAPE) dd *p_4;  
   return TRUE; $4BvDZDk`B  
  if(pMsg -> wParam == VK_RETURN) x7/";L>  
   return TRUE; Cl!9/l?z  
 } LX#gc.c  
 return CDialog::PreTranslateMessage(pMsg); 8k;il54#  
} #gXxBM  
iWIq~t*,H]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }l Gui>/D  
{ \J(kM,ZJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9T0g%&  
  SaveBmp(); `yO'-(@"gY  
  return FALSE;  BO.Db``  
} q`UaJ_7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y2=yh30L0E  
 CMenu pop; G"h}6Za;DO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Nt/hF>"7  
 CMenu*pMenu=pop.GetSubMenu(0); S q{@4F}d  
 pMenu->SetDefaultItem(ID_EXITICON); -_XTy!I  
 CPoint pt; z7TyS.z  
 GetCursorPos(&pt); 6w[EJ;=p_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wOsg,p;\'  
 if(id==ID_EXITICON) I{=Yuc  
  DeleteIcon();  45WJb+$  
 else if(id==ID_EXIT) fg4mP_  
  OnCancel(); U*?`tdXJ$  
 return FALSE; %*#+(A"V  
} `@#rAW D  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =nqHVRA  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dg_w$#  
 AddIcon(); 'c# }^@G  
 return res; [v`kqL~  
} :aH5=@[!y  
gFsqCx<q  
void CCaptureDlg::AddIcon() Eihn%Esa  
{ K D?b|y @  
 NOTIFYICONDATA data; bP>Kx-%q  
 data.cbSize=sizeof(NOTIFYICONDATA); lnRL^ }  
 CString tip; -!}3bl*(7  
 tip.LoadString(IDS_ICONTIP); n#@Qd!uzM  
 data.hIcon=GetIcon(0); ;%;||?'v  
 data.hWnd=GetSafeHwnd(); F~eY'~&H}  
 strcpy(data.szTip,tip); -+0kay%  
 data.uCallbackMessage=IDM_SHELL; $m A2 AI  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4]6-)RHFB  
 data.uID=98; +}PN+:yV  
 Shell_NotifyIcon(NIM_ADD,&data); Je}0KW3G9L  
 ShowWindow(SW_HIDE); +wxsAGy_j  
 bTray=TRUE; bkS"]q)>  
} \`E^>6!]q  
Ov ^##E  
void CCaptureDlg::DeleteIcon() u1=K#5^  
{ @w`wJ*I4,  
 NOTIFYICONDATA data; qG ? :Q  
 data.cbSize=sizeof(NOTIFYICONDATA); n>w<vM  
 data.hWnd=GetSafeHwnd(); NpaS2q-d  
 data.uID=98; SMzq,?-`  
 Shell_NotifyIcon(NIM_DELETE,&data); m xqY  
 ShowWindow(SW_SHOW); <'N:K@Cs  
 SetForegroundWindow(); </u=<^ire  
 ShowWindow(SW_SHOWNORMAL); 72 |O&`O  
 bTray=FALSE; e~d=e3mBp  
} h9/fD5  
"%p7ft  
void CCaptureDlg::OnChange() D~#%^a+Aq_  
{ [:cvy[}v@  
 RegisterHotkey(); =E<H_cUS  
} }pIn3B)  
C511 hbF  
BOOL CCaptureDlg::RegisterHotkey() aYDo0?kF'  
{ ?)186dp  
 UpdateData(); lRb>W31"  
 UCHAR mask=0; Ri~$hs!  
 UCHAR key=0; H2+b3y-1a]  
 if(m_bControl) L9lJ4s  
  mask|=4; j[.nk  
 if(m_bAlt) ^\&FowpP  
  mask|=2; ,Aai-AGG@  
 if(m_bShift) {M5t)-  
  mask|=1;  *} ?  
  key=Key_Table[m_Key.GetCurSel()]; n,2   
 if(bRegistered){ *mbzK*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .ESvMK~x  
  bRegistered=FALSE; >0W P:-\*  
 } %qiVbm0  
 cMask=mask; a[ayr$Hk?  
 cKey=key; ^ nI2<P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "r* `*1  
 return bRegistered; QXN_ ?E,g/  
} _DH^ K 9,9  
#W~5M ?+  
  四、小结 FWq 6e,  
Gx y>aS3  
  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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