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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: n-y^ 7'v  
  -?aw^du  
  一、实现方法 n4vXm  
3j+=3n,  
  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: y4/>Ol]  
N8 kb-2  
#pragma data_seg("shareddata") )_9e@ ~,  
HHOOK hHook =NULL; //钩子句柄 v$)@AE  
UINT nHookCount =0; //挂接的程序数目 /=muj9|+s  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D]pK=247  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 s-GleX<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey b#p~F}qT  
static int KeyCount =0; s3Krob`C5  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 q: Bt]2x  
#pragma data_seg() //X e*0  
E+m]aYu"  
  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。 9B+ zJ Vte  
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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: KkdG.c'  
h/1nm U]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hsHVX[<5`  
cKey,UCHAR cMask) D%jD 8p  
{ hi {2h04  
 BOOL bAdded=FALSE; _H4$$  
 for(int index=0;index<MAX_KEY;index++){ 9{O2B5u1  
  if(hCallWnd[index]==0){ KH2F#[ !Lw  
   hCallWnd[index]=hWnd; Y8J ;+h9  
   HotKey[index]=cKey; HzD>-f  
   HotKeyMask[index]=cMask; QN5yBa!Wz  
   bAdded=TRUE; Q{qj  
   KeyCount++; iHE0N6%q  
   break; -7-Fd_F8  
  } BrNG%%n  
 } [+;FV!M6  
 return bAdded; ?AV&@EX2C  
} W>` g;[ W  
//删除热键 e8d5(e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9C557$nS^  
{ 9n>$}UI\  
 BOOL bRemoved=FALSE; ]RH=s7L  
 for(int index=0;index<MAX_KEY;index++){ ><;l:RGK|  
  if(hCallWnd[index]==hWnd){ GOYn\N;V2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )Lc<;=w'9  
    hCallWnd[index]=NULL; 85r)>aCMn  
    HotKey[index]=0; f MY;  
    HotKeyMask[index]=0; ).0V%}>  
    bRemoved=TRUE; *? K4!q'  
    KeyCount--; /S7+B ]  
    break; ]z-']R;  
   } l zfD)TWb  
  } ' "ZRD_"  
 } )l+XDI  
 return bRemoved; &YT_#M  
} ?ID* /u|X  
N?qIpv/a.  
.sd B3x  
  DLL中的钩子函数如下: nB cp7e  
";wyNpb(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .9T.3yQ  
{ $ZQl IJZ  
 BOOL bProcessed=FALSE; 6 QN1+MwB  
 if(HC_ACTION==nCode) *.kj]BoO  
 { Cz'xGW{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 KWFyw>*)  
   switch(wParam) ftYR,!&  
   {  eaV3) uP  
    case VK_MENU: cT/3yf  
     MaskBits&=~ALTBIT; `fQM  
     break; `t{D7I7  
    case VK_CONTROL: {E!$ xY8  
     MaskBits&=~CTRLBIT; )8pc f`h{  
     break; uk`T+@K  
    case VK_SHIFT: zc6H o  
     MaskBits&=~SHIFTBIT; b7,  
     break; (bg}an  
    default: //judge the key and send message 7*zB*"B'1t  
     break; qTyg~]e9(  
   } KK:N [x  
   for(int index=0;index<MAX_KEY;index++){ kx|me~I  
    if(hCallWnd[index]==NULL) 7d3 'CQQ4  
     continue; '"oo;`g7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -1Djo:y  
    { [X;>*-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s{yJ:WncI  
     bProcessed=TRUE; 0-*Z<cu%l  
    } pG0!ALT  
   } |if'_x1V  
  } OI~}e,[2z  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]}BB/KQy^  
   switch(wParam) Cf Qf7-  
   { y7CWBTH0>  
    case VK_MENU: 5B}3GBA  
     MaskBits|=ALTBIT; ( FM4 ^#6  
     break; Hab!qWK`  
    case VK_CONTROL: OZG0AX+=#  
     MaskBits|=CTRLBIT; O[; +i  
     break; pPoH5CzcK  
    case VK_SHIFT: ?K0U3V$s  
     MaskBits|=SHIFTBIT; pp(H PKs=}  
     break; fk+1#7{  
    default: //judge the key and send message s>T`l  
     break; $v FrUv  
   } {5SfE$r  
   for(int index=0;index<MAX_KEY;index++){ hO#HvW  
    if(hCallWnd[index]==NULL) ] } '^`  
     continue; j2M4H@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #-,g&)`]  
    { %>i@F=O2<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zCBplb  
     bProcessed=TRUE; uii7b 7[w  
    } YZ0en1ly  
   } *yrnK3  
  } f7Yz>To  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8fnR1mWG  
   for(int index=0;index<MAX_KEY;index++){ pP3U,n   
    if(hCallWnd[index]==NULL) xFOBF")  
     continue; A 6:Q<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QO@6VY@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Lj4&_b9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 u2 7S %2P  
   } Z+0?yQ=%  
  } jM*AL X  
 } \ [cH/{nt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 26M~<Ic  
} q&Q/?g>f  
7UnzIe  
  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: /M:H9Z8!  
V7P6zAJy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oB4#J*   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f7Zf}1|  
WJAYM2 6\  
  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: .?f:Nb.O  
Ee8--  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }S,-uggz  
{ 7ZQ'h3K  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) c -w0  
 { 2\5cjdy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n? ]f@OR  
  SaveBmp(); !Vb,zQ  
  return FALSE; C,.-Q"juH  
 } HM):"  
 …… //其它处理及默认处理 @m?{80;uQ  
} >{QdMn  
JPsSw  
*E}Oh  
  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。 d Qai4e>[  
 [@<G+j  
  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。 u%xDsT DP  
U%q:^S%#eG  
  二、编程步骤 WV2~(/hX&  
v{.\iIg N  
  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"; & N;pH  
V/+Jc( N  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Evkt_vvf  
rCE;'? Y  
  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; *qG$19b  
-?5$ PH  
  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; Q<yAT(w  
*2=W5LaK.  
  5、 添加代码,编译运行程序。 ) \ 4 |  
jXWNHIl)@  
三、程序代码 _W|R;Cz]  
-AC`q/bCD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9^!wUwB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x<s|vgl|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ n8$=f'Hgb  
#if _MSC_VER > 1000 UW/N MjK  
#pragma once k-Fdj5/  
#endif // _MSC_VER > 1000 "<x&pQZ%  
#ifndef __AFXWIN_H__ ~0ooRUWU7  
#error include 'stdafx.h' before including this file for PCH $3 4j6;oN  
#endif UWw}!1  
#include "resource.h" // main symbols HlPG3LD!  
class CHookApp : public CWinApp >t0%?wj)Y  
{ yb?{LL-uy  
 public: ]\BUoQ7I/  
  CHookApp(); /[iG5~G  
  // Overrides 69/?7r  
  // ClassWizard generated virtual function overrides (zC   
  //{{AFX_VIRTUAL(CHookApp) /l6\^Xf{  
 public: H_Os4}  
  virtual BOOL InitInstance(); Yx),6C3  
  virtual int ExitInstance(); ?q!FG(  
  //}}AFX_VIRTUAL _88QgThb  
  //{{AFX_MSG(CHookApp) Y\p $SN  
  // NOTE - the ClassWizard will add and remove member functions here. FsY(02  
  // DO NOT EDIT what you see in these blocks of generated code ! @!<d0_dnC  
  //}}AFX_MSG V&[eSVY?  
  DECLARE_MESSAGE_MAP()  U(~U!O}  
}; x'qWM/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -`Q}tg>cT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AK*N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HIGNRm  
BOOL InitHotkey(); 30_ckMG"g  
BOOL UnInit(); |s f*hlrJ  
#endif |l7%l&!  
%b =p< h'(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8*s7m   
#include "stdafx.h" e\9g->DUs  
#include "hook.h" _!!}'fMC  
#include <windowsx.h>  M6Pw /S!  
#ifdef _DEBUG ?'sXgo.}  
#define new DEBUG_NEW ru{f]|  
#undef THIS_FILE ],[)uTZc  
static char THIS_FILE[] = __FILE__; -CD\+d  "  
#endif ^i'y6J  
#define MAX_KEY 100 :Q-oV8t{  
#define CTRLBIT 0x04 d0 -~| `5  
#define ALTBIT 0x02 @]=f?+y[ 2  
#define SHIFTBIT 0x01 HE;V zR  
#pragma data_seg("shareddata") 6>,# 6{?jl  
HHOOK hHook =NULL; C),7- ?  
UINT nHookCount =0; a4&:@`=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey TsHF tj9S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT EgNH8i  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `c(\i$1JY)  
static int KeyCount =0; 8Z#21X>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift L2fVLK H  
#pragma data_seg() qS.)UaA  
HINSTANCE hins; TnA?u (R%  
void VerifyWindow(); xo  Gb  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) yN\e{;z`  
//{{AFX_MSG_MAP(CHookApp) <MdGe1n  
// NOTE - the ClassWizard will add and remove mapping macros here. #hJQbv=B"  
// DO NOT EDIT what you see in these blocks of generated code! }+0z,s~0.  
//}}AFX_MSG_MAP 9&K/GaG  
END_MESSAGE_MAP() h/<=u9J  
R#qI( V  
CHookApp::CHookApp() \84v-VK  
{ ^u)rB<#BR  
 // TODO: add construction code here, i2PZ'.sL  
 // Place all significant initialization in InitInstance ~HmxEk9  
} O>V(cmqE`  
-@M3Dwsi3  
CHookApp theApp; XoItV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VVuR+=.&  
{ i8~ r  
 BOOL bProcessed=FALSE; +xj "hX>3  
 if(HC_ACTION==nCode) -(IC~   
 { %idk@~HCg  
  if((lParam&0xc0000000)==0xc0000000){// Key up = .`jjDJ  
   switch(wParam) `4 UlJ4<`  
   { T?npQA07=  
    case VK_MENU: /IR#A%U  
     MaskBits&=~ALTBIT; +\`rmI  
     break; _%ZP{5D>  
    case VK_CONTROL: V1utUGJV  
     MaskBits&=~CTRLBIT; 2dbRE:v5  
     break; ]V<-J   
    case VK_SHIFT: {/}^D-  
     MaskBits&=~SHIFTBIT; 6)[< )?A.[  
     break; #3MKH8k&~  
    default: //judge the key and send message {TAw)!R~  
     break; , 2`~ NPb  
   } H}nJbnU  
   for(int index=0;index<MAX_KEY;index++){ rWQY?K@  
    if(hCallWnd[index]==NULL) 8Xn!Kpa  
     continue; 9.&mz}q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f z}?*vPW  
    { uGCp#>+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'UfeluMd  
     bProcessed=TRUE; [B9;?G  
    } 'MQ%)hipA  
   } -9o{vmB{  
  } G!Zyl^  
  else if((lParam&0xc000ffff)==1){ //Key down v0@)t&O  
   switch(wParam) w sY}JT  
   { [uR/M  
    case VK_MENU: };S0 G!  
     MaskBits|=ALTBIT;  ( Uk ,  
     break; n%$ &=-Fk  
    case VK_CONTROL: [e e30ELn  
     MaskBits|=CTRLBIT; mX\ ;oV!  
     break; js <Ww$zFW  
    case VK_SHIFT: z~Na-N  
     MaskBits|=SHIFTBIT; N:W9},  
     break;  >eS$  
    default: //judge the key and send message }htPTOy5  
     break; MFwO9"<A  
   } YBjdp=als  
   for(int index=0;index<MAX_KEY;index++) tu}>:mk  
   { Rs7 |}Dl}  
    if(hCallWnd[index]==NULL) !buz<h  
     continue; N.hzKq][  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W3JF5*  
    { .zC*Z&e,.[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A';QuWdT  
     bProcessed=TRUE; {p/YCch,  
    } ]vo_gKZ  
   } Gr)-5qh  
  } 9_huI'"p  
  if(!bProcessed){ T+CajSV  
   for(int index=0;index<MAX_KEY;index++){ /Ox)|) l  
    if(hCallWnd[index]==NULL) G]*|H0j  
     continue; 1;wb(DN*c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;n*J$B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =2 jhII  
   } l[YEKg  
  } C-SLjJw  
 } `&*bM0(J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wk[ wNIu  
} :&yDqoQKJ  
^:cRp9l"7  
BOOL InitHotkey() -cfx2;68  
{ FFzH!=7T?  
 if(hHook!=NULL){ rC }}r!!  
  nHookCount++; (vyz;Ob  
  return TRUE; M{KW@7j  
 } flnVYQe  
 else 8MF2K6  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); K=\&+at1  
  if(hHook!=NULL) !7 _\P7M  
   nHookCount++; }5n  
  return (hHook!=NULL); n1J]p#nCa.  
} U^_D|$6  
BOOL UnInit() _gV8aH ZyM  
{ G[z .&l  
 if(nHookCount>1){ '%7 Bxof  
  nHookCount--; X")|Uw8Kl/  
  return TRUE; xsP4\C>  
 } /A07s[L  
 BOOL unhooked = UnhookWindowsHookEx(hHook); LmL Gki$w  
 if(unhooked==TRUE){ HL8eD^  
  nHookCount=0; ;j'Daupt;=  
  hHook=NULL; M_1;$fWq  
 } xRxy|x[  
 return unhooked; Lj 8<' "U#  
} w^;DG  
O\Eqr?%L)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >K)2NLW\xA  
{ sb.J bE8  
 BOOL bAdded=FALSE; Eipp ~GD  
 for(int index=0;index<MAX_KEY;index++){ "wM1qX  
  if(hCallWnd[index]==0){ DxSsg  
   hCallWnd[index]=hWnd; m 7 LUrU  
   HotKey[index]=cKey; #oV+@D`  
   HotKeyMask[index]=cMask; 4 I@p%g&  
   bAdded=TRUE; ~W{-Q.  
   KeyCount++; Q5n`F5   
   break; bToq$%sCg  
  } wCb(>pL0  
 } f[jN wb  
 return bAdded; 8r:M*25  
} \b8\Ug~t  
 .i/m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ht6244:  
{ vg\/DbI'  
 BOOL bRemoved=FALSE; `_qK&&s  
 for(int index=0;index<MAX_KEY;index++){ wAF,H8 -DK  
  if(hCallWnd[index]==hWnd){ k`VM2+9h'^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $c9k*3{<+A  
    hCallWnd[index]=NULL; Tls a%pn  
    HotKey[index]=0; A Y9 9!p  
    HotKeyMask[index]=0; f )NHM'  
    bRemoved=TRUE; K+d2m9C=  
    KeyCount--; jRj=Awy  
    break; 5<R%H{3j  
   } 1W,(\'^R  
  } xeA#u J  
 } bB 6[Xj{  
 return bRemoved; C/tr$.2H=  
} WUoOGbA `  
&M[f&_"8Q  
void VerifyWindow() Qc"'8kt  
{ = r4!V>  
 for(int i=0;i<MAX_KEY;i++){ j^SZnMQf  
  if(hCallWnd!=NULL){ r<R4 1Fz  
   if(!IsWindow(hCallWnd)){ w{,4rk;Hr  
    hCallWnd=NULL; }31Z X  
    HotKey=0; &m'kI  
    HotKeyMask=0; zG9|K  
    KeyCount--; #h'@5 l  
   } :td ~g;w  
  } N4{nG,Mo]  
 } s] au/T6b  
} 4IsG=7   
Fo|xzLm9*|  
BOOL CHookApp::InitInstance() jna;0)  
{ 07_oP(;jT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^DAu5|--R  
 hins=AfxGetInstanceHandle(); U@-2Q=  
 InitHotkey(); M\2"gT-LV  
 return CWinApp::InitInstance(); WlVl[/qt  
} !@L=;1,  
wWjG JvJ  
int CHookApp::ExitInstance() w# y2_  
{ 1{PG>W  
 VerifyWindow(); vmZ"o9-{#X  
 UnInit(); Gt-UJ-RR y  
 return CWinApp::ExitInstance(); 3Qn!y\#  
} \ v2H^j/  
Akk 3 Qx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file M0'v&g  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `DW2spd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hv)8K'u  
#if _MSC_VER > 1000 {})$ 99"x  
#pragma once \vbk#G hH  
#endif // _MSC_VER > 1000 F:g=i}7  
c:4P%({  
class CCaptureDlg : public CDialog _eQ-`?  
{ uh3) 0.nR  
 // Construction xBM>u,0.F  
 public: `'4)q}bB  
  BOOL bTray; = [@)R!3H  
  BOOL bRegistered; :nJgwp()@  
  BOOL RegisterHotkey(); ?vtX"Fdz  
  UCHAR cKey; &xd.Qi2  
  UCHAR cMask; smy}3k  
  void DeleteIcon(); pV\YG B+  
  void AddIcon(); LBlN2)\@  
  UINT nCount; dF@)M  
  void SaveBmp(); +}kgQ^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor k2^a$k}  
  // Dialog Data j;nb?;  
  //{{AFX_DATA(CCaptureDlg) ;`j/D@H  
  enum { IDD = IDD_CAPTURE_DIALOG }; X@wm1{!  
  CComboBox m_Key; O<*5$,K9  
  BOOL m_bControl; %V_-%/3Z  
  BOOL m_bAlt; /n5n )P@L  
  BOOL m_bShift; u?H 2%hD  
  CString m_Path; 6ghx3_%w  
  CString m_Number; D]03eu  
  //}}AFX_DATA 't (O$  
  // ClassWizard generated virtual function overrides `lpz-"EEV  
  //{{AFX_VIRTUAL(CCaptureDlg) \=2m7v#E  
 public: Wch~ Yb  
  virtual BOOL PreTranslateMessage(MSG* pMsg); CXaWgxlK:a  
 protected: 9U_ks[Qa  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %&blJ6b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I["j=r  
  //}}AFX_VIRTUAL </~ 6f(mg  
  // Implementation c0- ;VZ'  
 protected: d IB }_L  
  HICON m_hIcon; x~DLW1I  
  // Generated message map functions C"V%# K  
  //{{AFX_MSG(CCaptureDlg) [3>GGX[Ic  
  virtual BOOL OnInitDialog(); [0;buVU.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /R8p]  
  afx_msg void OnPaint(); yt0,^*t_  
  afx_msg HCURSOR OnQueryDragIcon(); S;\R!%t_  
  virtual void OnCancel(); @tT-JwU  
  afx_msg void OnAbout(); hsNWqk qys  
  afx_msg void OnBrowse(); J ++v@4Z  
  afx_msg void OnChange(); )0 Z!n  
 //}}AFX_MSG I*|P@0  
 DECLARE_MESSAGE_MAP() Wr~yK? : ]  
}; i775:j~zx0  
#endif c-1q2y  
Xq#Y*lKVD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2)0b2QbQ  
#include "stdafx.h" |`rJJFA  
#include "Capture.h" j]4,<ppWSH  
#include "CaptureDlg.h" vDj;>VE2b  
#include <windowsx.h> m.Lij!0  
#pragma comment(lib,"hook.lib") B;#J"6w  
#ifdef _DEBUG @4+#Xd7"  
#define new DEBUG_NEW ~Qj}ijWD  
#undef THIS_FILE HTjkR*E  
static char THIS_FILE[] = __FILE__; _=f=fcl  
#endif epD?K  
#define IDM_SHELL WM_USER+1 @tUoD>f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #Z,E><t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ':h =*v8a  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PD[z#T!'  
class CAboutDlg : public CDialog ,^s0</v e  
{ _r Y,}\  
 public: ;@mRo`D`  
  CAboutDlg(); Sr Ca3PA  
  // Dialog Data \.{AAj^qD  
  //{{AFX_DATA(CAboutDlg) v({N:ya  
  enum { IDD = IDD_ABOUTBOX }; %Q"(/jm?  
  //}}AFX_DATA P7 yq^|  
  // ClassWizard generated virtual function overrides X JGB)3QI  
  //{{AFX_VIRTUAL(CAboutDlg) ^z;JVrW  
 protected: Jl<ns,Zg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S7iDTG_@t  
  //}}AFX_VIRTUAL /%rq hHs  
  // Implementation \1%l^dE@  
 protected: vv0Q$ O->  
  //{{AFX_MSG(CAboutDlg) ,I.WX,OR  
  //}}AFX_MSG ?,knit2x  
  DECLARE_MESSAGE_MAP() e)^j+ l  
}; }%!tT\8  
^V*-1r1  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0?Q_@Y  
{ -b;|q.!  
 //{{AFX_DATA_INIT(CAboutDlg) rVSZ.+n  
 //}}AFX_DATA_INIT W_YY#wf_  
} GRqT-/n"  
77 r(*.O|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vG.9 H_&  
{ N#xG3zZl|N  
 CDialog::DoDataExchange(pDX); ^_+XDO  
 //{{AFX_DATA_MAP(CAboutDlg) B}?IEpYp  
 //}}AFX_DATA_MAP ;\;M =&{}  
} -1|iz2^N  
dE`-\J  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) yx{3J  
 //{{AFX_MSG_MAP(CAboutDlg) Z?NW1m()F  
 // No message handlers AasZuO_I  
 //}}AFX_MSG_MAP ( <*e  
END_MESSAGE_MAP() El2e~l9  
M" lg%j  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Z=S>0|`R  
: CDialog(CCaptureDlg::IDD, pParent) ;az5ZsvN D  
{ xG2+(f#C1  
 //{{AFX_DATA_INIT(CCaptureDlg) 8P' ana  
  m_bControl = FALSE; e( X|3h|  
  m_bAlt = FALSE; LaMLv<)k  
  m_bShift = FALSE; _~'+Qe_o$5  
  m_Path = _T("c:\\"); <PN"oa#  
  m_Number = _T("0 picture captured."); +_l^ #?o,  
  nCount=0; &} 6KPA;  
  bRegistered=FALSE; ksR1k vTm  
  bTray=FALSE; eet Q}]  
 //}}AFX_DATA_INIT Q4*-wF-P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (7FW9X;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LtgXShp_!  
} ,,L2(N  
`\u;K9S6  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) G bP!9I  
{ [V8fu qE>  
 CDialog::DoDataExchange(pDX); M\<w#wZ  
 //{{AFX_DATA_MAP(CCaptureDlg) H].y w9  
  DDX_Control(pDX, IDC_KEY, m_Key); $(pF;_W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ; 0v>Rfa  
  DDX_Check(pDX, IDC_ALT, m_bAlt); m} ?rJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ` Nh"  
  DDX_Text(pDX, IDC_PATH, m_Path); %qf  V+^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ef!XV7 P  
 //}}AFX_DATA_MAP ~X(UcZ2  
} , "0)6=AE  
>g ll-&;t  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1j-te-}"c  
//{{AFX_MSG_MAP(CCaptureDlg) `lDut1J5n  
 ON_WM_SYSCOMMAND() P(k(m< 0  
 ON_WM_PAINT() z&8un% Jt  
 ON_WM_QUERYDRAGICON() `6Qdfmk=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) QnouBrhO  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yF._*9Q3hK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) FyoEQ%.bI  
//}}AFX_MSG_MAP tvKAIwe  
END_MESSAGE_MAP() T GB_~Bqe  
m#/_x  
BOOL CCaptureDlg::OnInitDialog() ;TiUpg</_3  
{ pv!oz2w1  
 CDialog::OnInitDialog(); [%A4]QzWh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?(6mVyIe  
 ASSERT(IDM_ABOUTBOX < 0xF000); C#V ~Y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ,B}I?vN.  
 if (pSysMenu != NULL) t>)45<PEw  
 { qSCv )S(  
  CString strAboutMenu; BKa- k!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &)F*@C-  
  if (!strAboutMenu.IsEmpty()) RkeltE~u  
  { ~I}9;XT  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?|{XZQ~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3oZ=k]\  
  } zQ6p+R7D  
 } 0H_!Kg  
 SetIcon(m_hIcon, TRUE); // Set big icon H5cV5E0  
 SetIcon(m_hIcon, FALSE); // Set small icon wd@aw/  
 m_Key.SetCurSel(0); ^rl"rEA  
 RegisterHotkey(); s MN*RKer  
 CMenu* pMenu=GetSystemMenu(FALSE); Lw7=+h)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V! |qYM.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); W=B"Q qL  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AwUi+|7r])  
 return TRUE; // return TRUE unless you set the focus to a control RZp cXv  
} <N,)G |&  
DHC+C4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f;SC{2f  
{ H1" q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) DciwQcG  
 { hG~reVNf  
  CAboutDlg dlgAbout; @Y,7'0U  
  dlgAbout.DoModal(); hJz):d>Im  
 } dx*qb  
 else YNrp}KQ  
 { J/!cGr( B~  
  CDialog::OnSysCommand(nID, lParam);  h_d+$W5  
 } ]'~vI/p  
} c)md  
SHb(O<6  
void CCaptureDlg::OnPaint() I:V0Xxz5t  
{ ]&~]#vB#  
 if (IsIconic()) {4aWR><  
 { S\6[EQ65  
  CPaintDC dc(this); // device context for painting ,bE$| x'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); y;?ie]3G  
  // Center icon in client rectangle 5m:i6,4  
  int cxIcon = GetSystemMetrics(SM_CXICON); RyB~Lm`ZK%  
  int cyIcon = GetSystemMetrics(SM_CYICON); X;F?:Iw\  
  CRect rect; 8;Fn7k_Uf  
  GetClientRect(&rect); e}VBRvr  
  int x = (rect.Width() - cxIcon + 1) / 2; u,3,ck!B>@  
  int y = (rect.Height() - cyIcon + 1) / 2; s#Jh -+lM  
  // Draw the icon :HxA`@Ok  
  dc.DrawIcon(x, y, m_hIcon); 4n1; Bh$  
 } %ows BO+  
 else 9~rUkHD  
 { Z|9u]xL  
  CDialog::OnPaint(); '\fY<Q:!  
 } %n%xR%|  
} PfS:AI y  
2jsw"aHW  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9z;HsUv  
{ Rd7_~.Bo  
 return (HCURSOR) m_hIcon; d%I" /8-J  
} C9DJO:f.2y  
H2xeP%;$  
void CCaptureDlg::OnCancel() o`zr>  
{ :!;'J/B@..  
 if(bTray) I|-p3g8\  
  DeleteIcon(); ?;YC'bF  
  CDialog::OnCancel(); @pI5lh  
} f=!PllxL:  
CxhY$%C (L  
void CCaptureDlg::OnAbout() Mr--4D0Hk  
{ pu!dqF<  
 CAboutDlg dlg; e7fiGl  
 dlg.DoModal(); }ZSQ>8a  
} @=]~\[e\  
~1m2#>  
void CCaptureDlg::OnBrowse() R8L_J6Kpa  
{ u JR%0E7!  
 CString str; U`Jy!x2m  
 BROWSEINFO bi; .O*bILU  
 char name[MAX_PATH]; )4?x5#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Ed0IWPx  
 bi.hwndOwner=GetSafeHwnd(); ``,k5!a66\  
 bi.pszDisplayName=name; 3lLMu B+  
 bi.lpszTitle="Select folder"; BYW^/B Y)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @''GPL@  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (\"k&O{  
 if(idl==NULL) DcIvhBp  
  return; B{oU,3U>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +(O~]Q-Ez  
 str.ReleaseBuffer(); SYeadsvF  
 m_Path=str; 04%S+y.6&Y  
 if(str.GetAt(str.GetLength()-1)!='\\') &|%6|u9  
  m_Path+="\\"; ]`g <w#  
 UpdateData(FALSE); 6+V\t+aug  
} N$Y" c*  
P+t#4J  
void CCaptureDlg::SaveBmp() V>64/  
{ ]%uZ\Q;9p  
 CDC dc; :0K8h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +9O5KI?P  
 CBitmap bm; 1iL 'V-y  
 int Width=GetSystemMetrics(SM_CXSCREEN); gx03xPeu  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z=4{Vv*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,y9iKkg  
 CDC tdc; lT\a2.E  
 tdc.CreateCompatibleDC(&dc); '6$*YN&5  
 CBitmap*pOld=tdc.SelectObject(&bm); ODc9r }  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;o/>JHGj  
 tdc.SelectObject(pOld);  Pi%%z  
 BITMAP btm; B,z<%DAE  
 bm.GetBitmap(&btm); obK*rdg ,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9p 4"r^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Obw?_@X  
 BITMAPINFOHEADER bih; Z3 ;!l  
 bih.biBitCount=btm.bmBitsPixel; C8#@+Q.  
 bih.biClrImportant=0; wOQ#N++C  
 bih.biClrUsed=0; <?D[9Mk$  
 bih.biCompression=0; I fO;S*Qt  
 bih.biHeight=btm.bmHeight; ; )Kh;;e  
 bih.biPlanes=1; &`Y!;@K9W#  
 bih.biSize=sizeof(BITMAPINFOHEADER); xX0-]Y h:  
 bih.biSizeImage=size; Cp^@zw*/  
 bih.biWidth=btm.bmWidth; Z'^U ad6  
 bih.biXPelsPerMeter=0; 7z\m; 1  
 bih.biYPelsPerMeter=0; IdIrI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @ P@c.*}s  
 static int filecount=0; 41#w|L \  
 CString name; %or,{mmiM:  
 name.Format("pict%04d.bmp",filecount++); ,1q_pep~?%  
 name=m_Path+name; _qvK*nE  
 BITMAPFILEHEADER bfh; VhT= l  
 bfh.bfReserved1=bfh.bfReserved2=0; in<Rq"L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); " +KJop  
 bfh.bfSize=54+size; 9/SXs0  
 bfh.bfOffBits=54; ej&<GM|  
 CFile bf; sDgXU@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ IYWjH E+)d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >Sa*`q3J  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yix'rA-T  
  bf.WriteHuge(lpData,size); : "6q,W  
  bf.Close(); Nf+b" &Zh`  
  nCount++; $d+DDm1o  
 } j9qREf9)  
 GlobalFreePtr(lpData); f:zFFpP.j@  
 if(nCount==1) ,3v+PIcMM+  
  m_Number.Format("%d picture captured.",nCount); s#h8%['  
 else Q|}a R:4  
  m_Number.Format("%d pictures captured.",nCount); |CgnCUv+  
  UpdateData(FALSE); ]U[X1W+@  
} JJV0R}z?TV  
o sbHs$C  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bf_I9Z3m  
{ NRnRMY-  
 if(pMsg -> message == WM_KEYDOWN) 0U66y6  
 { )PkNWj6%y  
  if(pMsg -> wParam == VK_ESCAPE) Xf =XBoN|  
   return TRUE; H-rWDN#  
  if(pMsg -> wParam == VK_RETURN) |6J ?8y  
   return TRUE; 4@ILw  
 } |{g+Y  
 return CDialog::PreTranslateMessage(pMsg); STfyCtS  
} [~W`E1,  
fsO9EEn7 X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3`hUo5K  
{ >idBS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ezhDcI_T  
  SaveBmp(); [MX;,%;;  
  return FALSE; ^/wfXm  
} s )voII&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ aI zv  
 CMenu pop; c_{z(W"  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pDPxl?S  
 CMenu*pMenu=pop.GetSubMenu(0); d lH$yub  
 pMenu->SetDefaultItem(ID_EXITICON); iK;dU2h  
 CPoint pt; +&tgJ07A  
 GetCursorPos(&pt); Q8p&Ki;i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U]qav,^[  
 if(id==ID_EXITICON) PYB+FcR6?n  
  DeleteIcon(); Uts"aQ  
 else if(id==ID_EXIT) |1Dc!V'?"  
  OnCancel(); (VvKGh  
 return FALSE; 50j OA#l[  
} +y[@T6_  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kI*(V [i  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) F}Mhs17!|  
 AddIcon(); @e~]t}fH  
 return res; p\wJD1s  
} lM\LN^f5*  
zHB_{(o7  
void CCaptureDlg::AddIcon() f<i7@%  
{ Rg29  
 NOTIFYICONDATA data; F9c`({6k  
 data.cbSize=sizeof(NOTIFYICONDATA); RnVtZ#SCh  
 CString tip; P`$12<\O1  
 tip.LoadString(IDS_ICONTIP); Ocg"M Gb  
 data.hIcon=GetIcon(0); ^s7,_!.Pq  
 data.hWnd=GetSafeHwnd(); !2Dy_U=  
 strcpy(data.szTip,tip); |ifHSc.j<  
 data.uCallbackMessage=IDM_SHELL; mOll5O7VW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P#kGX(G9!  
 data.uID=98; UbJ*'eoX  
 Shell_NotifyIcon(NIM_ADD,&data); Qz<d~ N  
 ShowWindow(SW_HIDE); iWXc  
 bTray=TRUE; -y) ,Y |  
} /rB{[zk  
)!9Ifk0KH  
void CCaptureDlg::DeleteIcon() >(9F  
{ ,7]k fB  
 NOTIFYICONDATA data; 4}v@C|.p  
 data.cbSize=sizeof(NOTIFYICONDATA); 5`^o1nGO'  
 data.hWnd=GetSafeHwnd(); {mYP<NBT  
 data.uID=98; lYf+V8{  
 Shell_NotifyIcon(NIM_DELETE,&data); =1/NFlt8  
 ShowWindow(SW_SHOW); g]mtFrP  
 SetForegroundWindow(); s}M= oe  
 ShowWindow(SW_SHOWNORMAL); cl[!`Z  
 bTray=FALSE; #~:P}<h  
} KcGsMPJ  
wn +FTqj  
void CCaptureDlg::OnChange() BJjx|VA+  
{ ClW'W#*(Y  
 RegisterHotkey(); 2)iD4G`  
} 3{raKM6F  
!&kL9A).  
BOOL CCaptureDlg::RegisterHotkey() (Ha@s^?.C  
{ UyYfpL"$A"  
 UpdateData(); _cJ[ FP1  
 UCHAR mask=0; 9~AWng  
 UCHAR key=0; /  YiQ\  
 if(m_bControl) _68BP)nz>.  
  mask|=4; 4Wel[]  
 if(m_bAlt) U SOKDDm  
  mask|=2; yFIy`9R  
 if(m_bShift) 6y+b5-{'  
  mask|=1; wjU.W5IR  
  key=Key_Table[m_Key.GetCurSel()]; UgHf*m  
 if(bRegistered){ Gu(lI ~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O0l^*nZ46t  
  bRegistered=FALSE; e&Y0}oY  
 } 'E;W  
 cMask=mask; j28_Hh T  
 cKey=key; N?r>%4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); my^ak*N  
 return bRegistered; f*((;*n ;  
} hAR? t5c  
8 ,}ikOZ?  
  四、小结 #~Q=h`9  
Bl.u=I:Y4  
  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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