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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: x5\Du63  
  M'R ] ''  
  一、实现方法 ~QUNR?h  
4*f+np  
  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: *mj=kJ7(  
5-fASN.Lx  
#pragma data_seg("shareddata") YGQ/zB^Pj  
HHOOK hHook =NULL; //钩子句柄 PY '^:0  
UINT nHookCount =0; //挂接的程序数目 <uFj5.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 R%}<z*~NE@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n ei0LAD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /=za m3kd  
static int KeyCount =0; K0vS  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Ici4y*`M  
#pragma data_seg() |/xA5_-N  
~};q/-[r  
  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。 WY@g=W>+  
{0,6- dd5  
  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: G,<d;:  
T3=h7a %=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [x, `)Fk  
cKey,UCHAR cMask) H2[0@|<<  
{ fH9"sBiO  
 BOOL bAdded=FALSE; ,:K{  
 for(int index=0;index<MAX_KEY;index++){ :'q$emtY  
  if(hCallWnd[index]==0){ SFwY%2np)!  
   hCallWnd[index]=hWnd; 0'A"]6  
   HotKey[index]=cKey; sxuP"4  
   HotKeyMask[index]=cMask; OUwnVAZZ6  
   bAdded=TRUE; )AcevEHB  
   KeyCount++; WB'1_a  
   break; rZB='(?  
  } x.pg3mVd>  
 } nLk`W"irM  
 return bAdded; kQ&Q_FSO  
} ]i,o+xBKH  
//删除热键 c]U+6JH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m-~3c]pA  
{ FY)]yz  
 BOOL bRemoved=FALSE; g<^A(zM  
 for(int index=0;index<MAX_KEY;index++){ |Axbx?  
  if(hCallWnd[index]==hWnd){ ~bzac2Rp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *m>[\)  
    hCallWnd[index]=NULL; ^gyI-S(;  
    HotKey[index]=0; Jo;&~/ V   
    HotKeyMask[index]=0; N5K2Hv<"  
    bRemoved=TRUE; K3=0D!Dq  
    KeyCount--; BL>~~  
    break; UB8n,+R  
   } Y%TY%"<  
  } @aFk|.6  
 } hD?6RVfG  
 return bRemoved; rk;]7Wu  
} .X.6<@$  
>e-0A  
w9"~NK8xzM  
  DLL中的钩子函数如下: ;{R;lF,  
jHHCJOHB8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O+< +yQl  
{ "8?Fl&=Q  
 BOOL bProcessed=FALSE; qvWi;  
 if(HC_ACTION==nCode) eYkg4O'  
 { Pq{p\Qkj  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 S{MB$JA  
   switch(wParam) U %BtBPL  
   {  E|RC|Sz=u  
    case VK_MENU: ?0sTx6x@  
     MaskBits&=~ALTBIT; GCr]x '  
     break; n?D/bXp  
    case VK_CONTROL: ?5};ONjN  
     MaskBits&=~CTRLBIT; #J5_z#-Q;  
     break; KMqGWO*  
    case VK_SHIFT: WLVkrTvX  
     MaskBits&=~SHIFTBIT; 8a8D0}'  
     break; Ie _{P&J  
    default: //judge the key and send message hc0$mit  
     break; 1.8"N&s  
   } |) &d9|]  
   for(int index=0;index<MAX_KEY;index++){ z9 #-  
    if(hCallWnd[index]==NULL) 69:-c@ L0  
     continue; o F_{oV '  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y1ca=ewFx  
    { jxhZOLG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }?6;;d#  
     bProcessed=TRUE; j5/|1N  
    } ;iJxJX\+  
   } >mMfZvxl%  
  } Vom,^`}  
  else if((lParam&0xc000ffff)==1){ //有键按下 VhMVoW  
   switch(wParam) # &5.   
   { \3K7)o^  
    case VK_MENU: 1BEc"  
     MaskBits|=ALTBIT; :w|=o9J  
     break; Ets6tM`  
    case VK_CONTROL: bF,.6iKI  
     MaskBits|=CTRLBIT; 't*]6^  
     break; -U9C{q?h  
    case VK_SHIFT: ku}`PS0UGd  
     MaskBits|=SHIFTBIT; L>7@!/ 9L  
     break; }1Mf0S  
    default: //judge the key and send message \x4:i\Fx@  
     break; DVg$rm`  
   } }[@Q**j(  
   for(int index=0;index<MAX_KEY;index++){ W 9}xfy09  
    if(hCallWnd[index]==NULL) (=1zMZ o  
     continue;  nsV=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c (5XT[Tw  
    { :.a184ax  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DC BN89#  
     bProcessed=TRUE; 'q}f3u>  
    } [C;Neslo  
   } IBu\Sh-  
  } Pn@DHYP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 fshG ~L7S9  
   for(int index=0;index<MAX_KEY;index++){ HKO]_; :(  
    if(hCallWnd[index]==NULL) y | I9"R  
     continue; X+,0;% p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v&]y zl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~>0H k}Hv  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 PVljb=8F  
   } W*(- * \1[  
  } q j9q   
 }  <|82)hO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,jw`9a  
} *O[/- p&7  
Zvfy%k   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: O%F*i2I:+k  
)4:]gx#cr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <1* \ ~CX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R4k+.hR  
Q uw|KL  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Vwjic2lGI  
:mf&,?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BxQ,T@  
{ u.?jWvcv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3qH1\  
 { `/!FZh<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7d|1T'  
  SaveBmp(); )z4eRs F|  
  return FALSE; utC^wA5U~  
 } 7 &%#bMnw  
 …… //其它处理及默认处理 l2dj GZk  
} cF9oo%3  
C6@*l~j  
^mC,Z+!  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 tc\ZYCFr  
FDGG$z?>m  
  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。 n^5Q f\o  
s&$e}yxVO  
  二、编程步骤 Zv-1*hhHf  
jWh)bsqI!  
  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"; !)W#|sys&  
[EZ=tk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Y(?SE< 4R  
f4+wP/n&  
  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; m^TN6/])  
ObS#aRq  
  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; Odhr=Hs  
_RZ"WA^[  
  5、 添加代码,编译运行程序。 J}#2Wy^{  
W5:fY>7  
三、程序代码 q 6>}  
}?c%L8\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XAtRA1.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =9 ^}>u  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w8J8III\~  
#if _MSC_VER > 1000 Zt=P 0  
#pragma once +KNd%AJ  
#endif // _MSC_VER > 1000 EdSUBoWF}  
#ifndef __AFXWIN_H__ qZ@d:u  
#error include 'stdafx.h' before including this file for PCH mieyL9*n7  
#endif hJir_=  
#include "resource.h" // main symbols ssoE,6kS  
class CHookApp : public CWinApp ]\L+]+u~  
{ ];b+f@  
 public: 8.I3%u  
  CHookApp(); 3=} P l,  
  // Overrides }Ujgd2(U  
  // ClassWizard generated virtual function overrides ('\sUZ+5  
  //{{AFX_VIRTUAL(CHookApp) `s Pk:cNz~  
 public: b7T;6\[m  
  virtual BOOL InitInstance(); du#f_|xG  
  virtual int ExitInstance(); Rr[Wka9[  
  //}}AFX_VIRTUAL  y}|E)  
  //{{AFX_MSG(CHookApp) owVks-/  
  // NOTE - the ClassWizard will add and remove member functions here. Yw5-:w0f  
  // DO NOT EDIT what you see in these blocks of generated code ! .n)R@&9  
  //}}AFX_MSG ue'dI   
  DECLARE_MESSAGE_MAP() Z'}%Mkm`i}  
}; ozl!vf# kv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +o"CMI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R(cg`8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D.x8=|;  
BOOL InitHotkey(); gNA!)}m\  
BOOL UnInit(); e+4Eiv  
#endif Z 5)v  
*">CEQ[MT  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9d(#/n  
#include "stdafx.h" bw7gL\*  
#include "hook.h" u7Ix7`V  
#include <windowsx.h> 3?L[ohKH?:  
#ifdef _DEBUG r ) _*MPY  
#define new DEBUG_NEW  {d0-.  
#undef THIS_FILE nLv~)IQ}:  
static char THIS_FILE[] = __FILE__; Fpeokr"i  
#endif cx&\oP  
#define MAX_KEY 100 n4}e!  
#define CTRLBIT 0x04 (~E-=+R[$&  
#define ALTBIT 0x02 z5Tsu1 c  
#define SHIFTBIT 0x01 SBDGms  
#pragma data_seg("shareddata") ,&o^}TFkg  
HHOOK hHook =NULL; x#zj0vI-8  
UINT nHookCount =0; A,=> |&*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey u GqeT#dP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /{R.   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i1m>|[@k  
static int KeyCount =0; ^3H:I8gRCl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |JHNFs  
#pragma data_seg() T{"Ur :p  
HINSTANCE hins; n~}[/ly  
void VerifyWindow(); gFu,q`Vf*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W3\E; C-g0  
//{{AFX_MSG_MAP(CHookApp) z,2*3Be6V  
// NOTE - the ClassWizard will add and remove mapping macros here. $ Y^0l  
// DO NOT EDIT what you see in these blocks of generated code! ) jvI Nb  
//}}AFX_MSG_MAP re}PpXRC  
END_MESSAGE_MAP() 1,Mm+_)B  
&/)B d%  
CHookApp::CHookApp() UL>2gl4s/  
{ ~/z%yg  
 // TODO: add construction code here, M+HhTW;I=  
 // Place all significant initialization in InitInstance =l${p*ABQ  
} yG7H>LF?8  
%N`_g' r!  
CHookApp theApp; z9g6%RbwX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $?]`2*i  
{ SBs!52  
 BOOL bProcessed=FALSE; 4# ]g852  
 if(HC_ACTION==nCode) M6^ \LtFt  
 { d,Oagx  
  if((lParam&0xc0000000)==0xc0000000){// Key up \@N~{72:k  
   switch(wParam) %iEdUV\$  
   { NqNU:_}  
    case VK_MENU: 3(,m(+J[S  
     MaskBits&=~ALTBIT; y,ub*-:  
     break; ud BIEW,`  
    case VK_CONTROL: N}ND()bf  
     MaskBits&=~CTRLBIT; 'g'RXC}D>  
     break; .s!0S-RkC  
    case VK_SHIFT: jWi~Q o+  
     MaskBits&=~SHIFTBIT; gTOx|bx  
     break; : xggo  
    default: //judge the key and send message x|dP-E41\  
     break; qBh@^GxY),  
   } o$+R  
   for(int index=0;index<MAX_KEY;index++){ -1v9  
    if(hCallWnd[index]==NULL) &ni#(   
     continue; 6DK).|@$r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^,AE;Z T7  
    { Q@>1z*'I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Iz. h  
     bProcessed=TRUE; cg17e  
    } -$0}rfX  
   } ?~t5>PEonv  
  } <g;,or#$  
  else if((lParam&0xc000ffff)==1){ //Key down e!gNd>b {  
   switch(wParam) {f)aFGp  
   { Kl%[fjI)  
    case VK_MENU: dg|x(p#  
     MaskBits|=ALTBIT; SOM? 0.  
     break; C/qKa[mg  
    case VK_CONTROL: @fp@1n  
     MaskBits|=CTRLBIT; 3\ Mt+!1{  
     break; <HN+pi  
    case VK_SHIFT: a=A12<  
     MaskBits|=SHIFTBIT; p I8z.JD  
     break; Tj_K5uccU}  
    default: //judge the key and send message 8]`s&d@GY  
     break; GIcq|Pe  
   } yUpN`;  
   for(int index=0;index<MAX_KEY;index++) YI"!&a'yj  
   { ?YZgH>7"  
    if(hCallWnd[index]==NULL) #0uu19+}  
     continue; jQ%1lQ#R)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Mog [,{w  
    { C,W_0= !e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U]vUa^nG  
     bProcessed=TRUE; .PVYYhrt  
    } M:%g)FgW  
   } :/szA?:W  
  } f'(F'TE  
  if(!bProcessed){ 3'`&D/n  
   for(int index=0;index<MAX_KEY;index++){ "#7Q}d!x  
    if(hCallWnd[index]==NULL) f77W{T4  
     continue; !-470J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F1-"yX1B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eLORG(;h4  
   } 7=}tJ  
  } xZ;eV76  
 } <Z3C&BM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \ moLQ  
} {nUmlP=mS  
U,v`md@PX  
BOOL InitHotkey() |UWIV  
{ eZ]r"_?  
 if(hHook!=NULL){ #<9'{i3  
  nHookCount++; uj.$GAtO)  
  return TRUE; $p0D9mF  
 } 3!gz^[!?EN  
 else #t(/wa4  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); { >[ ]iX  
  if(hHook!=NULL) VV/T)qEe7>  
   nHookCount++; /4 pYhJ8S  
  return (hHook!=NULL); H%U  
} t`|Rn9-  
BOOL UnInit() H+Bon=$cE!  
{  =5B5  
 if(nHookCount>1){ #TR!x,Hc  
  nHookCount--; *K$a;2WjzG  
  return TRUE; hp2E! Cma  
 } bF_0',W  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !h7:rv/  
 if(unhooked==TRUE){ *qSvSY*  
  nHookCount=0; OhCdBO  
  hHook=NULL; m)pHCS  
 } +[uh);vD`G  
 return unhooked; 1 Vt,5o5  
} >W-xDzJry  
3I( n];  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) juWXB+d2Y  
{ pqpsa'  
 BOOL bAdded=FALSE; jFe8s@7  
 for(int index=0;index<MAX_KEY;index++){ vvxD}p=y  
  if(hCallWnd[index]==0){ L v/}&'\(  
   hCallWnd[index]=hWnd; u;rmqo1  
   HotKey[index]=cKey; 5~DKx7P!Z  
   HotKeyMask[index]=cMask; L3wj vq^  
   bAdded=TRUE; ]oSx]R>{f  
   KeyCount++; YQ d($  
   break; fcF|m5  
  } NJr)f  
 } S>(xx"Ia  
 return bAdded; FO^6c  
} Oi:Hs  
uIO,9> ee  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [j@i^B &  
{ zzI,iEG  
 BOOL bRemoved=FALSE; 9M9Fif.  
 for(int index=0;index<MAX_KEY;index++){ &(, &mE  
  if(hCallWnd[index]==hWnd){ lg$aRqI29  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qtZzJ>Y  
    hCallWnd[index]=NULL; M$ieM[_T  
    HotKey[index]=0; KP0(w(q  
    HotKeyMask[index]=0; ~b)X:ku  
    bRemoved=TRUE; >m1b/J3#  
    KeyCount--; "A~dt5GJ  
    break; WK*tXc_[b  
   } c)^A|{,G  
  } 0Q7<;'m  
 } }[PwA[k'  
 return bRemoved; [3-u7Fx!  
} .Er+*j;&w  
1/:vFX  
void VerifyWindow() 6-"tQ,AZ  
{ P8dMfD*"E  
 for(int i=0;i<MAX_KEY;i++){ s,[ I_IiPf  
  if(hCallWnd!=NULL){ -nC&t~sD  
   if(!IsWindow(hCallWnd)){ LA\3 ,Uv  
    hCallWnd=NULL; 7lwI]/ZH*  
    HotKey=0; ti9e(Jt!O  
    HotKeyMask=0; bIBF2m4  
    KeyCount--; iH-,l  
   } 2RNee@!JJP  
  } Lc}hjK  
 } L7rr/D  
} 5TuwXz1v  
e#mf{1&  
BOOL CHookApp::InitInstance() R||$Rfe  
{ M61Nl)|mx&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lc5(^ ~  
 hins=AfxGetInstanceHandle(); $X)|`$#pL#  
 InitHotkey(); b1IAp>*2l  
 return CWinApp::InitInstance(); ?OnL,y|  
} m)<+?Bv y  
~s'}_5;VY  
int CHookApp::ExitInstance() aDX&j2/  
{ dPpQCx f  
 VerifyWindow(); GR*sk#{  
 UnInit(); Hc\@{17   
 return CWinApp::ExitInstance(); =2GKv7q$x,  
} u?SwGXi~8  
cOpe6H6,bz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `g1?Q4h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x{w|Hy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JiXE{(  
#if _MSC_VER > 1000 P6>C+T1  
#pragma once -WyB2$!(  
#endif // _MSC_VER > 1000 Y+23 jlgb  
$RI$VyAjD  
class CCaptureDlg : public CDialog _ti^i\8~  
{ X}3?k<m  
 // Construction 4x+[?fw  
 public: OMjPC_  
  BOOL bTray; &${| o@  
  BOOL bRegistered; O zC%6;6h  
  BOOL RegisterHotkey(); 4NaT@68p  
  UCHAR cKey; 1qn/*9W}=  
  UCHAR cMask; K9&Q@3V  
  void DeleteIcon(); FPK=Tr:b  
  void AddIcon(); VK*H1EH1  
  UINT nCount; .tfal9  
  void SaveBmp(); Ex_dqko  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A~>B?Wijqg  
  // Dialog Data ?rt[ aK  
  //{{AFX_DATA(CCaptureDlg) z)*{bz]  
  enum { IDD = IDD_CAPTURE_DIALOG }; lAA6tlc#C  
  CComboBox m_Key; ='kCY}dkO  
  BOOL m_bControl; o(54 A['  
  BOOL m_bAlt; n>Oze7hVY  
  BOOL m_bShift; *HV_$^)=  
  CString m_Path; TK'y-5W  
  CString m_Number; %K\B )HR  
  //}}AFX_DATA dly -mPmP  
  // ClassWizard generated virtual function overrides G2!<C-T{2  
  //{{AFX_VIRTUAL(CCaptureDlg) jc:=Pe!E  
 public: 4<1V  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0VJHE~Bgi  
 protected: >{Mv+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xgNV0;g,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U5cbO{\ 3I  
  //}}AFX_VIRTUAL 0;`FS /[(f  
  // Implementation %UooZO  
 protected: j<Pw0?~s6  
  HICON m_hIcon; [N[4\W!!  
  // Generated message map functions 0lq?l:/  
  //{{AFX_MSG(CCaptureDlg) Bo ywgL|  
  virtual BOOL OnInitDialog(); 6f#Mi+"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6_yatq5c  
  afx_msg void OnPaint(); GYJ j$'  
  afx_msg HCURSOR OnQueryDragIcon(); &y73^"%  
  virtual void OnCancel(); NhYUSk ~u  
  afx_msg void OnAbout(); X[w]aJnAr  
  afx_msg void OnBrowse(); _RzoXn{1e  
  afx_msg void OnChange(); [Ax :gj  
 //}}AFX_MSG n3U| d+  
 DECLARE_MESSAGE_MAP()  4J=6U&b  
}; ;cL+= !  
#endif nHXPEbq-g  
/: \27n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4UW)XLu6T7  
#include "stdafx.h" 6=Q6J  
#include "Capture.h" Ax@7RJ||  
#include "CaptureDlg.h" c-.F {~  
#include <windowsx.h> "[z/\l8O  
#pragma comment(lib,"hook.lib") 3ErV" R4"$  
#ifdef _DEBUG N@'l: N'f4  
#define new DEBUG_NEW ' MyJw*%b]  
#undef THIS_FILE Ya<KMBi3  
static char THIS_FILE[] = __FILE__; ,_7m<(/f  
#endif X>yE<ni  
#define IDM_SHELL WM_USER+1 TOP,]N/F H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z!'k N\z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g?j^d:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "<&o ;x<  
class CAboutDlg : public CDialog #sv}%oV,F  
{ l_2l/ff9  
 public: m\ qR myO  
  CAboutDlg(); Q>w)b]d~c  
  // Dialog Data wax^iL!  
  //{{AFX_DATA(CAboutDlg) b=WkRj  
  enum { IDD = IDD_ABOUTBOX }; kwS[,Qy\  
  //}}AFX_DATA [CV0sYEA  
  // ClassWizard generated virtual function overrides |D'!.$7%  
  //{{AFX_VIRTUAL(CAboutDlg) F$:mGyl5_  
 protected: 7n;a_Z0s$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [%Dh0hOg  
  //}}AFX_VIRTUAL d|UH AX  
  // Implementation '}>8+vU`  
 protected: O7&OCo|b%>  
  //{{AFX_MSG(CAboutDlg) vj#m#1\ f  
  //}}AFX_MSG \ sz](X  
  DECLARE_MESSAGE_MAP() j~;y~Cx?  
}; l<"B[  
G[zysxd  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mkBQ TQGT  
{ 2Qp]r+!  
 //{{AFX_DATA_INIT(CAboutDlg) C<^S$  
 //}}AFX_DATA_INIT b3GTsX\2|  
} &s\,+d0  
rg%m   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D[YdPg@-  
{ 9(KffnE^  
 CDialog::DoDataExchange(pDX); ^:O*Sx.CA  
 //{{AFX_DATA_MAP(CAboutDlg) 7 X~JLvN  
 //}}AFX_DATA_MAP W^H[rX}=  
} lKRp9isn^  
>M m.MNU  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) zRau/1Y0  
 //{{AFX_MSG_MAP(CAboutDlg) %uP/v\l  
 // No message handlers TUp%Cx  
 //}}AFX_MSG_MAP ]@}@G[e#[  
END_MESSAGE_MAP() &(x>J:b  
sJg3WN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T Q {8 ee{  
: CDialog(CCaptureDlg::IDD, pParent) ,~K4+ t_  
{ HE2t0sAYX  
 //{{AFX_DATA_INIT(CCaptureDlg) /cZcfCW  
  m_bControl = FALSE; AZJ|.mV q  
  m_bAlt = FALSE; G%%F6)W  
  m_bShift = FALSE; ,zBc-Cm  
  m_Path = _T("c:\\"); d _=44( -  
  m_Number = _T("0 picture captured."); y dzvjp=  
  nCount=0; cf_X=;yaqy  
  bRegistered=FALSE; .e S* F  
  bTray=FALSE; )B5U0iIi  
 //}}AFX_DATA_INIT VOmS>'$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K<u~[^R  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _xP@kN~  
} n 2(\pQKm  
=G rg  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g-+/zEOUS  
{ kw1Lm1C  
 CDialog::DoDataExchange(pDX); LyNur8 Zi  
 //{{AFX_DATA_MAP(CCaptureDlg) x1#6~283  
  DDX_Control(pDX, IDC_KEY, m_Key); )YLZ"@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _p+q)#.W  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *b1NVN$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); B8V85R  
  DDX_Text(pDX, IDC_PATH, m_Path); 6y@o[=m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); DsiyN:o'+  
 //}}AFX_DATA_MAP q1%xk =8  
} Sa6YqOel@  
"9H#pj -  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) KH[Oqd  
//{{AFX_MSG_MAP(CCaptureDlg) J8`vk#5  
 ON_WM_SYSCOMMAND() f%STkL)  
 ON_WM_PAINT() .ityudT<  
 ON_WM_QUERYDRAGICON() &gvX<X4e  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) mgEZiAV?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =Ajw(I[56  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Cz4l  
//}}AFX_MSG_MAP M""X_~&I"  
END_MESSAGE_MAP() 79M` ?xm  
D_I_=0qNd  
BOOL CCaptureDlg::OnInitDialog() 8GT{vW9  
{ 7I6& *I  
 CDialog::OnInitDialog(); pkA(\0E8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tpKQ$) ed  
 ASSERT(IDM_ABOUTBOX < 0xF000); W4AFa>h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G9> 0w)r  
 if (pSysMenu != NULL) `XbV*{7  
 { C5#$NV99p  
  CString strAboutMenu; A Rjox`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IAbH_+7O  
  if (!strAboutMenu.IsEmpty()) sVIw'W  
  { \OF"hPq  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2wZyUB;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /vFdhh  
  } `ve5>aw0_Y  
 } 4*+)D8  
 SetIcon(m_hIcon, TRUE); // Set big icon T(eNK c2  
 SetIcon(m_hIcon, FALSE); // Set small icon uacVF[9|W  
 m_Key.SetCurSel(0); , @6_sl  
 RegisterHotkey(); eZRu{`AF*  
 CMenu* pMenu=GetSystemMenu(FALSE); Y<`uq'V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); WAh{*$Rpl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #c2JWDH1F  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pS)/yMlVj  
 return TRUE; // return TRUE unless you set the focus to a control qznd '^[  
} sMqAuhw$.  
l,M?   
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;z^C\=om  
{  jQ?6I1o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W6uz G  
 { H9T'{R*FC  
  CAboutDlg dlgAbout; 09rbu\h  
  dlgAbout.DoModal(); |=4imM7  
 } @{UtS2L  
 else 0N*~"j;r#M  
 { D7b] ;Nf\  
  CDialog::OnSysCommand(nID, lParam); Ea[K$NC)#  
 } VSa#X |z  
} pWXoJ0N  
2=xjgK  
void CCaptureDlg::OnPaint() WMd5Y`y  
{ +}0/ %5 =1  
 if (IsIconic()) 2AI~Jm#  
 { 8;]U:tv  
  CPaintDC dc(this); // device context for painting IHtNaN )  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  h48 jKL(  
  // Center icon in client rectangle ey>V^Fj  
  int cxIcon = GetSystemMetrics(SM_CXICON); G4eY}3F7,4  
  int cyIcon = GetSystemMetrics(SM_CYICON); Vi1= E])  
  CRect rect; 3]1uDgfr  
  GetClientRect(&rect); 7nAB^~)6l  
  int x = (rect.Width() - cxIcon + 1) / 2; n[pW^&7x  
  int y = (rect.Height() - cyIcon + 1) / 2; StJ&YYdD  
  // Draw the icon vEIDf{  
  dc.DrawIcon(x, y, m_hIcon); A~Ov(  
 } VdV18-ea  
 else I&O}U|l06  
 { t LZ4<wc  
  CDialog::OnPaint(); + \AiUY  
 } )a%kAUNj  
} Y^-faL7*\  
.. xg4V/  
HCURSOR CCaptureDlg::OnQueryDragIcon() h}o7/p  
{ h{&}p-X&[  
 return (HCURSOR) m_hIcon; 3-5X^!C  
} \]eB(&nq  
m:,S1V_jl  
void CCaptureDlg::OnCancel() ~]_g q;bG  
{ |i7j }i  
 if(bTray) gE>_:s   
  DeleteIcon(); AF}6O(C~  
  CDialog::OnCancel(); 8f37o/L  
} prx)Cfv  
w{1DwCLKq  
void CCaptureDlg::OnAbout() `}YCUm[SI  
{ 1 \_S1ZS  
 CAboutDlg dlg; -5~&A6+ILn  
 dlg.DoModal(); Q^qdm5}UkW  
} Rs<li\GS  
 1 U|IN=  
void CCaptureDlg::OnBrowse() {uQp$`  
{ b3z {FP  
 CString str; T(E$0a)#  
 BROWSEINFO bi; #R<ErX)F  
 char name[MAX_PATH]; 4]F:QS% x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :qbbo~U  
 bi.hwndOwner=GetSafeHwnd(); 1d4?+[)gUv  
 bi.pszDisplayName=name;  ahno$[  
 bi.lpszTitle="Select folder"; _%` )cOr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $y\\ ?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Dl2`b">u  
 if(idl==NULL) 9 -\.|5;:  
  return; +5|wd6  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); b42"Y,sbB  
 str.ReleaseBuffer(); h <s.o#8  
 m_Path=str; x4&<Vr  
 if(str.GetAt(str.GetLength()-1)!='\\') z3V[ Vi  
  m_Path+="\\"; p,hDZea  
 UpdateData(FALSE); &QaFX,N"  
} Bw ]Y7 1  
OaeGukhX&  
void CCaptureDlg::SaveBmp() qHT_,\l2  
{ Sl,\  <a  
 CDC dc; YY\$lM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BB&7VSgc-  
 CBitmap bm; |;XkU`G  
 int Width=GetSystemMetrics(SM_CXSCREEN); vN`2KCl~3  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8ug\GlZc  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /0PBY-O  
 CDC tdc; \>b :  
 tdc.CreateCompatibleDC(&dc); 8[zux4<m  
 CBitmap*pOld=tdc.SelectObject(&bm); MlDWK_y_&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,i>{yrsOh  
 tdc.SelectObject(pOld); #bz#&vt$  
 BITMAP btm; +j*hbG=  
 bm.GetBitmap(&btm); 9~ [Sio~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lV4|(NQ9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5%+M:B  
 BITMAPINFOHEADER bih; I\%a<  
 bih.biBitCount=btm.bmBitsPixel; C5q n(tv  
 bih.biClrImportant=0; \e89 >m  
 bih.biClrUsed=0; nH6Ny  
 bih.biCompression=0; &!|'EW  
 bih.biHeight=btm.bmHeight; i%M6$or  
 bih.biPlanes=1; O] T'\6w  
 bih.biSize=sizeof(BITMAPINFOHEADER); P;.j5P^j`  
 bih.biSizeImage=size; *] H8X=[x  
 bih.biWidth=btm.bmWidth; e XB'>#&s  
 bih.biXPelsPerMeter=0; E}7@?o7u}  
 bih.biYPelsPerMeter=0; I?2S{]!?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /I`A wCx  
 static int filecount=0; M0+xl+c+  
 CString name; 9/?@2  
 name.Format("pict%04d.bmp",filecount++); nY]5pOF:  
 name=m_Path+name; WOw( -  
 BITMAPFILEHEADER bfh; _6y#?8RMB  
 bfh.bfReserved1=bfh.bfReserved2=0; FX"j8i/N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); V7+fNr]I  
 bfh.bfSize=54+size; Rm^3K   
 bfh.bfOffBits=54; uq.!{3)8  
 CFile bf; ~pv|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y (a0*fh  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >s 5i  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); i?{cB!7  
  bf.WriteHuge(lpData,size); sbeS9vE  
  bf.Close(); hH&A1vUv  
  nCount++; 8>\tD  
 } J@ CKgE  
 GlobalFreePtr(lpData); F.]D\"0`  
 if(nCount==1) Mm&#I[:  
  m_Number.Format("%d picture captured.",nCount); ECZ`I Z.  
 else $N;Nvp2  
  m_Number.Format("%d pictures captured.",nCount); <$ "   
  UpdateData(FALSE); U ]o  
} 9oe=*#Ig1m  
No|T#=BZ[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Kc3BVZ71  
{ ? Zhnb0/  
 if(pMsg -> message == WM_KEYDOWN) Q%_QT0H9Kz  
 { dH5 Go9`~R  
  if(pMsg -> wParam == VK_ESCAPE) 4l2/eh]Hc(  
   return TRUE; ;hz;|\ko5  
  if(pMsg -> wParam == VK_RETURN) mz[Q]e~&i  
   return TRUE; {5GXN!f  
 } ~AvB5  
 return CDialog::PreTranslateMessage(pMsg); >cTSX  
} C2X$bX"  
bfE4.YF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TJ_<21a  
{ }0y2k7^]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nM<B{AR5^  
  SaveBmp(); IBT 1If3  
  return FALSE; j aU.hASj  
} rEoMj)~\4&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bgk+PQ#S-  
 CMenu pop; (aeS+d x  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3Fu5,H EJ  
 CMenu*pMenu=pop.GetSubMenu(0); [C>>j;q%  
 pMenu->SetDefaultItem(ID_EXITICON); s*g`| E{M  
 CPoint pt; n|p(Cb#G  
 GetCursorPos(&pt);  V6L0\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^\(<s  
 if(id==ID_EXITICON) tg R4C#a   
  DeleteIcon(); Bu]PNKIi  
 else if(id==ID_EXIT) eBZ94rA]  
  OnCancel(); s"'ns  
 return FALSE; Rj'Tu0l  
} (XU( e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  @mD$Z09~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D8rg:,'6  
 AddIcon(); dvW2X  
 return res; ^uV=|1<%  
} ~Y_5q)t(  
x\i+MVR-  
void CCaptureDlg::AddIcon() u3G.xlHH[  
{ oAxRI+&|.  
 NOTIFYICONDATA data; 3Fgl zJ  
 data.cbSize=sizeof(NOTIFYICONDATA); ~LfFLC  
 CString tip; @'~7O4WH  
 tip.LoadString(IDS_ICONTIP); +{r~-Rn3  
 data.hIcon=GetIcon(0); Q?g#?z&Pu\  
 data.hWnd=GetSafeHwnd(); _;!$1lM[  
 strcpy(data.szTip,tip); ja-,6*"k  
 data.uCallbackMessage=IDM_SHELL; b_&KL_vo{|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O{<uW-  
 data.uID=98; ~VKuRli|m  
 Shell_NotifyIcon(NIM_ADD,&data); Ux!q(9<_  
 ShowWindow(SW_HIDE); <Od5}  
 bTray=TRUE; fi tsu"G  
} .FdzEauVc  
%(X^GL  
void CCaptureDlg::DeleteIcon() JeXA*U#  
{ yt4sg/] :  
 NOTIFYICONDATA data; .',d*H))E7  
 data.cbSize=sizeof(NOTIFYICONDATA); *-vH64e  
 data.hWnd=GetSafeHwnd(); ,Qh9}I7;C  
 data.uID=98; .3 S9=d?  
 Shell_NotifyIcon(NIM_DELETE,&data); <9/?+)  
 ShowWindow(SW_SHOW); 4}r.g0L  
 SetForegroundWindow(); @UK%l :L  
 ShowWindow(SW_SHOWNORMAL); N?{.}-Q  
 bTray=FALSE; 8o  SL3  
} ]}Jb'(gMO4  
)F\^-laMuK  
void CCaptureDlg::OnChange() (R|_6[zy  
{ )4;$;a1  
 RegisterHotkey(); GQ8A}gwH  
} }v`Z. ?|Z  
L2Z-seE  
BOOL CCaptureDlg::RegisterHotkey() |I2~@RfpO:  
{ +Y_]<  
 UpdateData(); <*@!>6mS  
 UCHAR mask=0; n_/;j$h  
 UCHAR key=0; 5{|tE!  
 if(m_bControl) ,GY K3+}Z  
  mask|=4; [!S%nYs&8L  
 if(m_bAlt) tE$oV  
  mask|=2; ;[q>  
 if(m_bShift) +'"NKZ.>TT  
  mask|=1; = tY%k!R  
  key=Key_Table[m_Key.GetCurSel()]; L$3{L"/   
 if(bRegistered){ 7csMk5NU'<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,ieew`  
  bRegistered=FALSE; ai]KH7  
 } 3>#io^35  
 cMask=mask; Jz@2?wSp  
 cKey=key; ,c&%/"i:w  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1 uJpn  
 return bRegistered; p_EWpSOt7  
} 8=,?B h".  
3| F\a|N  
  四、小结 P_F0lO  
}Ryrd!3bY  
  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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