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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: >~0Z& d  
  t"oeQ*d%  
  一、实现方法 92oFlEJ  
8KzkB;=n  
  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: 13x p_j  
`VguQl_,gA  
#pragma data_seg("shareddata") Otn1wBI  
HHOOK hHook =NULL; //钩子句柄 1bwOm hkS  
UINT nHookCount =0; //挂接的程序数目 ^^ixa1H<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ' S/gmn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fe_5LC"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QoT;WM Z  
static int KeyCount =0; uoh7Sz5!^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]:J$w]\  
#pragma data_seg() }Jj}%XxKs  
@cXMG6:{  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 `'7R,  
63IM]J  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: a9Zq{Ysj  
FfT`;j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ] Zh%DQ  
cKey,UCHAR cMask) SOA,kwHRe  
{ 5\VWCI  
 BOOL bAdded=FALSE; c@L< Z`u  
 for(int index=0;index<MAX_KEY;index++){ ~((O8@}J  
  if(hCallWnd[index]==0){ F*ylnB3z  
   hCallWnd[index]=hWnd; sK?twg;D*|  
   HotKey[index]=cKey; l+0oS'`V*L  
   HotKeyMask[index]=cMask; BnF^u5kv%  
   bAdded=TRUE; ,Ma^&ypH  
   KeyCount++; j^RmrOg ,  
   break; NC6&x=!3  
  } H3-hcx54T  
 } e~"U @8xk~  
 return bAdded; a/xn'"eli  
} 19%i mf  
//删除热键 \1M4Dl5!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3F^Q51:t  
{ SNk=b6`9  
 BOOL bRemoved=FALSE; ysnx3(+|  
 for(int index=0;index<MAX_KEY;index++){ U- k`s[dv  
  if(hCallWnd[index]==hWnd){ vKAN@HSYr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'i|YlMFIg  
    hCallWnd[index]=NULL; >Y@H4LF;1x  
    HotKey[index]=0; M x" \5i  
    HotKeyMask[index]=0; Q^^niVz  
    bRemoved=TRUE; tw)mepwB  
    KeyCount--; ^E>3|du]O  
    break; ~WF\  
   } 7D_=  
  } Xne1gms  
 }  uHRsFlw  
 return bRemoved; !&@615Vtw  
} WcbiqxK7-  
+D*Z_Yh6  
>9Vn.S  
  DLL中的钩子函数如下: }4X0epPp;:  
,zY{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xxQ;xI0+]  
{ -jm Y)(\  
 BOOL bProcessed=FALSE; zX i 'kB  
 if(HC_ACTION==nCode) p0eX{xm  
 { J C}D` h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |-~Y#]  
   switch(wParam) Pr C{'XDlU  
   {  a(ZcmYzXU  
    case VK_MENU: y$M%2mh`  
     MaskBits&=~ALTBIT; =:U`k0rn!  
     break; +:/%3}`  
    case VK_CONTROL: ;5( UzQU  
     MaskBits&=~CTRLBIT; DzRFMYBR  
     break; {?7Uj  
    case VK_SHIFT: :\_ 5oVb  
     MaskBits&=~SHIFTBIT; #~=Ry H  
     break; \a3+rN dj  
    default: //judge the key and send message j.= 1rwPt  
     break; <9b &<K:  
   } XL/u#EA0<  
   for(int index=0;index<MAX_KEY;index++){ V>3X\)qu  
    if(hCallWnd[index]==NULL) XQw9~$  
     continue; )0k53-h&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }c:M^Ff  
    { 3Tm+g2w2V8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d2L&Z_}  
     bProcessed=TRUE; bpa?C  
    } 3=V &K-  
   } 'dc#F3  
  } ZSo)  
  else if((lParam&0xc000ffff)==1){ //有键按下  e]$s t?  
   switch(wParam) o^wqFX(Y  
   { X2"/%!65{  
    case VK_MENU: >/6 _ ^  
     MaskBits|=ALTBIT; +LJ73 !  
     break; u)Whr@m  
    case VK_CONTROL: 8H`[*|{'  
     MaskBits|=CTRLBIT; GTxk%   
     break; MiX43Pk]  
    case VK_SHIFT:  4Wp=y  
     MaskBits|=SHIFTBIT; ;mi%F3  
     break; bcz:q/f}@  
    default: //judge the key and send message M)(DZ}  
     break; oxtay7fx  
   }  LFV%&y|L  
   for(int index=0;index<MAX_KEY;index++){  05^h"  
    if(hCallWnd[index]==NULL) /BL4<T f  
     continue; tX~w{|k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /dIzY0<aO  
    { dDGQ`+H9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1=v*O.XW`  
     bProcessed=TRUE; K:WDl;8 (d  
    } 62NsJ<#>  
   } g 0E'g  
  } I]_5}[I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :rP=t ,  
   for(int index=0;index<MAX_KEY;index++){ asqV~n  
    if(hCallWnd[index]==NULL) 9A#i_#[R  
     continue; iN.n8MN=I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $<OD31T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y>ktcuML  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 eszG0Wu  
   } ~F#j#n(=`q  
  } ^=*;X;7  
 } ]I6  J7A[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &xExyz~`  
} A":T1s  
lk=<A"^S  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 8xMX  
vw@S>G lGg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NCD04U5y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dgP3@`YS  
#p{4^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: uEx-]F  
YchH~m|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #rg6,.I)<  
{ {\\T gs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) U%/+B]6jP  
 { FC4wwzb  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f,Ghb~y  
  SaveBmp(); !TcJ)0   
  return FALSE; bN=P*hdf  
 } [PbOfxxgA  
 …… //其它处理及默认处理 &6k3*dq  
} 7PF%76TO  
51.%;aY~z  
5E <kwi  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 [.}oyz; }N  
;O #>Y  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 q0 \6F^;M  
]K%!@O!  
  二、编程步骤 ]JR +ayk7  
M'l ;:  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; OB}Ib]  
yF/jFn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Z #m+ObHK1  
.o}v#W+st  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; wS3'?PRX  
.tr!(O],h  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; H%lVl8oQ  
W(/h Vt  
  5、 添加代码,编译运行程序。 HLi%%"'  
7o}J%z  
三、程序代码 CTA 3*Gn  
( uidNq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL xe$_aBU  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) n._-! WI  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ N4HqLh23H  
#if _MSC_VER > 1000 ?Ss!e$jf  
#pragma once Z$? #  
#endif // _MSC_VER > 1000 ^d73Ig:8q  
#ifndef __AFXWIN_H__ kAGBdaJ"  
#error include 'stdafx.h' before including this file for PCH Jfl!#UAD|n  
#endif 6-ils3&  
#include "resource.h" // main symbols uXl3k:_n  
class CHookApp : public CWinApp An/|+r\  
{ 3irl (;v  
 public: AkiDL=;w  
  CHookApp(); .5{ab\_af  
  // Overrides =H]@n|$(  
  // ClassWizard generated virtual function overrides 2I{"XB  
  //{{AFX_VIRTUAL(CHookApp) Oa>Ppldeg  
 public: caX< n>  
  virtual BOOL InitInstance(); h!9ei6  
  virtual int ExitInstance(); ygl0k \  
  //}}AFX_VIRTUAL }l9llu   
  //{{AFX_MSG(CHookApp) T&7qC=E#5  
  // NOTE - the ClassWizard will add and remove member functions here. zp?`N;  
  // DO NOT EDIT what you see in these blocks of generated code ! 11;zNjD|  
  //}}AFX_MSG @`Su0W+.  
  DECLARE_MESSAGE_MAP() r#mx~OVkk  
}; Y\'}a+:@Ph  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +x}<IS8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Fv`,3aNB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6;5Ss?ep  
BOOL InitHotkey(); Ilm^G}GB  
BOOL UnInit(); Rbv;?'O$L  
#endif ;YL i{  
?!/kZM_ts  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %vi83%$'4  
#include "stdafx.h" seeB S/%  
#include "hook.h" El"Q'(:/U  
#include <windowsx.h> LBP`hK:>W~  
#ifdef _DEBUG o*hF<D$Y  
#define new DEBUG_NEW FHI ;)wn=  
#undef THIS_FILE ENY+^7  
static char THIS_FILE[] = __FILE__; cj5+N M"  
#endif ]5:8Z@  
#define MAX_KEY 100 )dd@\n$6  
#define CTRLBIT 0x04  %D "I  
#define ALTBIT 0x02 koi^l`B$  
#define SHIFTBIT 0x01 ^5 Tqy(M  
#pragma data_seg("shareddata") x ]ot 2  
HHOOK hHook =NULL; &b& ,  
UINT nHookCount =0; E8&TO~"a]e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y4fdq7i~}9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9=2$8JN=(l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0_t!T'jr7  
static int KeyCount =0; b>JDH1)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qJUK_6|3  
#pragma data_seg() y:l\$ pGC%  
HINSTANCE hins; D. XvG_  
void VerifyWindow(); $L]lHji  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~61v5@  
//{{AFX_MSG_MAP(CHookApp) KKf   
// NOTE - the ClassWizard will add and remove mapping macros here. P7/X|M z  
// DO NOT EDIT what you see in these blocks of generated code! FaJ&GOM,  
//}}AFX_MSG_MAP W `}Rf\g  
END_MESSAGE_MAP() E-g_".agO  
k|d+#u[Mj@  
CHookApp::CHookApp() jRV/A!4  
{ wLr_-vJ  
 // TODO: add construction code here, wq`Bd  
 // Place all significant initialization in InitInstance UFuX@Lu0  
} $iz|\m  
&@YmA1Yu)E  
CHookApp theApp; 3? +Hd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {Y9q[D'g.  
{ ,zY$8y]  
 BOOL bProcessed=FALSE; 'uEl~> l7  
 if(HC_ACTION==nCode) 2jhxQL  
 { Y:a]00&)#Y  
  if((lParam&0xc0000000)==0xc0000000){// Key up f& '  
   switch(wParam) ]OzUGXxo~  
   { ]z9=}=If  
    case VK_MENU: HyWCMK6b  
     MaskBits&=~ALTBIT; h.t-`k7  
     break; E< fVZ,  
    case VK_CONTROL: \)|hogI|f  
     MaskBits&=~CTRLBIT; {/:x5l8  
     break; Z?QC!bWb  
    case VK_SHIFT: =rX>.P%Q5  
     MaskBits&=~SHIFTBIT; ~qOa\#x_  
     break; V "h +L7T  
    default: //judge the key and send message o " #\ >  
     break; }`~+]9 <   
   } @<&m|qtMsz  
   for(int index=0;index<MAX_KEY;index++){ d/DB nZN  
    if(hCallWnd[index]==NULL) o`*,|Nsq  
     continue; D}X\Ca"h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8-77d^cprR  
    { @sC`!Rmy'-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oILZgNe'  
     bProcessed=TRUE; +; AZ+w]ZF  
    } Y0 -n\|  
   } @I!0-OjL  
  } )Z9>$V$j  
  else if((lParam&0xc000ffff)==1){ //Key down d-dEQKI?;  
   switch(wParam) N<injx  
   { e**qF=HCw  
    case VK_MENU: [HZv8HU|  
     MaskBits|=ALTBIT; >\3V a  
     break; &KRX[2  
    case VK_CONTROL: Npy :!  
     MaskBits|=CTRLBIT; ^.NU|NQi'  
     break; JcxThZP~  
    case VK_SHIFT: Q$@I"V&G.  
     MaskBits|=SHIFTBIT; *bA.zmzM  
     break; "1 M[5\Ax  
    default: //judge the key and send message TbW38\>.R  
     break; jtc]>]6i  
   } NHZz _a=  
   for(int index=0;index<MAX_KEY;index++) s,&Z=zt0R  
   { JnM["Q=`  
    if(hCallWnd[index]==NULL) 7O-x<P;  
     continue; _zi|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w&T9;_/  
    { SNI)9k(T{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Hja3a{LH  
     bProcessed=TRUE; nc|p)  
    } 5"O.,H}  
   } X_\otV h(D  
  } '16b2n+F@#  
  if(!bProcessed){ '$%l7  
   for(int index=0;index<MAX_KEY;index++){ ,1o FPa{?  
    if(hCallWnd[index]==NULL) OYTkV}tG  
     continue; %Y*Ndt4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wcY? rE9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JrRH\+4K  
   } j HJ`,#  
  } Dwfu.ZJa  
 } P\rg" 3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y glmX"fLf  
} <B6H. P =  
dVT$VQg  
BOOL InitHotkey() RdR p.pb8  
{ l]l'4@1   
 if(hHook!=NULL){ 338k?nHxv  
  nHookCount++; GDiBl*D  
  return TRUE; p4 ^yVa  
 } n]o<S+z  
 else vT,AMja  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); q6V>zi  
  if(hHook!=NULL) VQ9/Gxdeo  
   nHookCount++; n[Y~]  
  return (hHook!=NULL); Fyatd  
} IKilr'  
BOOL UnInit() 6zuTQ^pz  
{ fHd#u%63K  
 if(nHookCount>1){ % ^1V4  
  nHookCount--; <1${1A <Wa  
  return TRUE; [j/9neaye  
 } N~zdWnSZ@G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0{}8(  
 if(unhooked==TRUE){ aE$[5 2  
  nHookCount=0; fSvM(3Y<Qh  
  hHook=NULL; Uf;^%*P4  
 } R|87%&6']  
 return unhooked; ,S]7 'UP  
} jLHkOk5{:  
Sk\K4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ls+2Zbh  
{ Tqn@P  
 BOOL bAdded=FALSE; |"CZT#  
 for(int index=0;index<MAX_KEY;index++){ nazZ*lC  
  if(hCallWnd[index]==0){ Gm^U;u}=f  
   hCallWnd[index]=hWnd; q ,]L$  
   HotKey[index]=cKey; Zw S F^  
   HotKeyMask[index]=cMask; 0rs"o-s<  
   bAdded=TRUE; N]=q|D  
   KeyCount++; 8\A#CQ5b  
   break; ^KT Y?  
  } scz&h#0V  
 } o~y;j75{.*  
 return bAdded; c2 C8g1n  
} Pw`8Wj  
=|y9UlsD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j[J-f@F \Y  
{ E,x+JeKV  
 BOOL bRemoved=FALSE; wc^tgE  
 for(int index=0;index<MAX_KEY;index++){ h(u8&MHx  
  if(hCallWnd[index]==hWnd){  B Qxs~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ag;pN*z  
    hCallWnd[index]=NULL; tGE$z]1c@  
    HotKey[index]=0; g(7rTyp4)  
    HotKeyMask[index]=0; ?ri?GmI|  
    bRemoved=TRUE; 9Uekvs=r=M  
    KeyCount--; 2*l/3VW  
    break; bUdLs.:  
   } Q1I6$8:7  
  } ]dmrkZz:  
 } &d?CCb$|0Y  
 return bRemoved; }?_?V&K|  
} qv KG-|j  
z3m85F%dR  
void VerifyWindow() u?<%q!  
{ yfjWbW  
 for(int i=0;i<MAX_KEY;i++){ Z4w!p?Wqa  
  if(hCallWnd!=NULL){ 6@F9G 4<Z  
   if(!IsWindow(hCallWnd)){ sW'AjI  
    hCallWnd=NULL; dhf!o0'1M  
    HotKey=0; u5b|#&-mX  
    HotKeyMask=0; Y>dzR)~3[  
    KeyCount--; W ]?G}Q;  
   } X Dm[Gc>(~  
  } pG^  
 } m6\E$;`  
} ~#[yJNYQ  
.K2qXw"S#  
BOOL CHookApp::InitInstance() n&qg;TT  
{ ;LPfXpR  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G3vxjD<DMW  
 hins=AfxGetInstanceHandle(); &P}_bx  
 InitHotkey(); UapC"XYJ  
 return CWinApp::InitInstance(); aU "8{  
} li'YDtMKCY  
 JWhdMU  
int CHookApp::ExitInstance() :tB1D@Cb6  
{ 6"5A%{ J  
 VerifyWindow(); v,{ :Ez(H  
 UnInit(); H.|#c^I  
 return CWinApp::ExitInstance(); RSyUaA  
} %G/ hD  
O1U=X:Zl  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file RYQR(v  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~IfJwBn-i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ z2_*%S@  
#if _MSC_VER > 1000 BxWPC#5  
#pragma once i$:*Pb3mV  
#endif // _MSC_VER > 1000 Xq]w<$  
r?lf($ D*  
class CCaptureDlg : public CDialog  gmO!  
{ gx8ouOh  
 // Construction t?x<g<PJ4  
 public: mAj?>;R2$2  
  BOOL bTray; 3G)#5 Lf<  
  BOOL bRegistered; L_uVL#To  
  BOOL RegisterHotkey(); RXpw!  
  UCHAR cKey; rb2S7k0{  
  UCHAR cMask; Jr ,;>   
  void DeleteIcon(); 'EEJU/"u  
  void AddIcon(); ug!s7fo^  
  UINT nCount; &0OG*}gi  
  void SaveBmp(); \FbvHr,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?qLFaFt/  
  // Dialog Data Yq0| J  
  //{{AFX_DATA(CCaptureDlg) q77;ZPfs8  
  enum { IDD = IDD_CAPTURE_DIALOG }; jk; clwyz/  
  CComboBox m_Key; +,T RfP Fb  
  BOOL m_bControl; 85|OGtt  
  BOOL m_bAlt; U0 Yll4E  
  BOOL m_bShift; h5{'Q$Erl  
  CString m_Path; ?cBwPetp  
  CString m_Number; hYT0l$Ng  
  //}}AFX_DATA szZr4y<8|1  
  // ClassWizard generated virtual function overrides e#L8X {f  
  //{{AFX_VIRTUAL(CCaptureDlg) SIF/-{i(X  
 public: [fya)}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @Q ]=\N:  
 protected: yYIf5S`V]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L3u&/Tn2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LEbB(x;@  
  //}}AFX_VIRTUAL BOb">6C  
  // Implementation JgKO|VO  
 protected: xjuN-  
  HICON m_hIcon; ?*G|XnM&  
  // Generated message map functions JIEK*ui  
  //{{AFX_MSG(CCaptureDlg) f}#~-.NGs  
  virtual BOOL OnInitDialog(); $<dH?%!7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ld|5TN1  
  afx_msg void OnPaint(); 1b `1{%  
  afx_msg HCURSOR OnQueryDragIcon(); :j9l"5"  
  virtual void OnCancel(); <Dl*l{zba  
  afx_msg void OnAbout(); VuhGx:Xl  
  afx_msg void OnBrowse(); *KZYv=s,u  
  afx_msg void OnChange(); M)J5;^["  
 //}}AFX_MSG 9-VNp;V  
 DECLARE_MESSAGE_MAP() RVnjNy;O`  
}; iW]j9}t  
#endif v}}F,c(f  
:}L[sl\R  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ajbA\/\G;  
#include "stdafx.h" 3 Gp$a;g  
#include "Capture.h" '1P2$#  
#include "CaptureDlg.h" ?Ny9'g>?  
#include <windowsx.h> 9N#_( uwt  
#pragma comment(lib,"hook.lib") 0rQMLx  
#ifdef _DEBUG E<{ R.r  
#define new DEBUG_NEW <.x{|p  
#undef THIS_FILE Thp[+KP>  
static char THIS_FILE[] = __FILE__; !1jBC.G1  
#endif Go`vfm"S  
#define IDM_SHELL WM_USER+1 e8>})  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A2I9R;}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lLX4Gq1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =57>!)  
class CAboutDlg : public CDialog oA7tE u   
{ n$MO4s8)  
 public: (Z+.45{-  
  CAboutDlg(); XO>KZV7)  
  // Dialog Data 6y-@iJ*ld;  
  //{{AFX_DATA(CAboutDlg) 4M=]wR;  
  enum { IDD = IDD_ABOUTBOX }; rT=rrvV3g  
  //}}AFX_DATA ?qv !w~m<  
  // ClassWizard generated virtual function overrides <,3a3  
  //{{AFX_VIRTUAL(CAboutDlg) BA@lk+aW  
 protected: FZ{h?#2?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [SjqOTon{  
  //}}AFX_VIRTUAL j nkR}wAA  
  // Implementation !hA-_  
 protected: h"[AOfTE$  
  //{{AFX_MSG(CAboutDlg) MD}w Y><C  
  //}}AFX_MSG f&N gS+<K$  
  DECLARE_MESSAGE_MAP() -V*R\,>  
}; 9@SC}AF.  
 R~TTL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bWjc'P6rx  
{ ]g#:KAqz  
 //{{AFX_DATA_INIT(CAboutDlg) fbyd"(V 8r  
 //}}AFX_DATA_INIT 2 ~dE<}  
} e[{0)y>=  
uP`Z12&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `[y^ :mj  
{ paA(C|%{  
 CDialog::DoDataExchange(pDX); +C^nO=[E  
 //{{AFX_DATA_MAP(CAboutDlg) _>o:R$ %}  
 //}}AFX_DATA_MAP l] K3Y\#bP  
} {X!r8i  
=}<IfNA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3<e=g)F  
 //{{AFX_MSG_MAP(CAboutDlg) Yj<a" Gr4[  
 // No message handlers k90YV(  
 //}}AFX_MSG_MAP iOf<$f  
END_MESSAGE_MAP() vO H4#  
3p$?,0ELH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) i7CX65&b  
: CDialog(CCaptureDlg::IDD, pParent) u%GEqruo[  
{ R)?*N@.s  
 //{{AFX_DATA_INIT(CCaptureDlg) 0gu_yg!R  
  m_bControl = FALSE; #z'  
  m_bAlt = FALSE; >1X|^  
  m_bShift = FALSE; [@_Jj3`4  
  m_Path = _T("c:\\"); cRC6 s8  
  m_Number = _T("0 picture captured."); +X\FBvP&  
  nCount=0; c^5~QGuQ  
  bRegistered=FALSE; V%t.l  
  bTray=FALSE; DcS+_>a\{l  
 //}}AFX_DATA_INIT {Ea b j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 x f'V{9*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bS{bkE>  
} "6("9"  
;_XFo&@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nd`1m[7MNu  
{ FBG4pb9=~  
 CDialog::DoDataExchange(pDX); B5`EoZ  
 //{{AFX_DATA_MAP(CCaptureDlg) `C,n0'PL.  
  DDX_Control(pDX, IDC_KEY, m_Key); x[| }.Ew  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  > ^O7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \Zb;'eDv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !@5 9)  
  DDX_Text(pDX, IDC_PATH, m_Path); x o;QCOH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ; t)3F  
 //}}AFX_DATA_MAP qfX6TV5J}!  
} 44J]I\+  
Mg+2. 8%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) M.JA.I@XC  
//{{AFX_MSG_MAP(CCaptureDlg) `T1  
 ON_WM_SYSCOMMAND() 8u"U1  
 ON_WM_PAINT() 6u?>M9  
 ON_WM_QUERYDRAGICON() E[OJ+ ;c  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gZVc 5u<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &L3M]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "6A ` q\  
//}}AFX_MSG_MAP {aZ0;  
END_MESSAGE_MAP() RCJ|P~*  
IM*y|UHt  
BOOL CCaptureDlg::OnInitDialog() g/4[N{Xf  
{ T%+ #xl  
 CDialog::OnInitDialog(); \-E^lIVF  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ??5Q)Erm1  
 ASSERT(IDM_ABOUTBOX < 0xF000); pG_;$8Hc  
 CMenu* pSysMenu = GetSystemMenu(FALSE); k``_EiV4t  
 if (pSysMenu != NULL) pt?bWyKG  
 { >k|5Okq g  
  CString strAboutMenu; ]43/`FX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L]7=?vN=8  
  if (!strAboutMenu.IsEmpty()) />C^WQI^  
  { 53_Hl]#qZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7K12 G!)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \Zk;ikEY  
  } cUk7i`M;6  
 } `Uq#W+r,  
 SetIcon(m_hIcon, TRUE); // Set big icon aNsBcov3O  
 SetIcon(m_hIcon, FALSE); // Set small icon 7lTC{7C57  
 m_Key.SetCurSel(0); gE-tjoJ  
 RegisterHotkey(); UJUEYG  
 CMenu* pMenu=GetSystemMenu(FALSE); KV91)U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \eTwXe]Pv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F k7?xc  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); " > ypIR<  
 return TRUE; // return TRUE unless you set the focus to a control .Cv6kgB@c  
} 8H[<X_/ke  
XE RUo  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TT%M' 5&  
{ _IMW {  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) YO`]UQ|dc  
 { Brw@g8w-X  
  CAboutDlg dlgAbout; t}a: p6D]  
  dlgAbout.DoModal(); kb%;=t2  
 } A.F%Ycq  
 else a9e>iU  
 { ?Rb9|`6  
  CDialog::OnSysCommand(nID, lParam); 4X/-4'  
 } 3=#<X-);  
} E#RDqL*J  
!"AvY y9  
void CCaptureDlg::OnPaint() m~BAyk^jo3  
{ TJd)K$O>  
 if (IsIconic()) .D~;u-%|F  
 { fy1|$d{'  
  CPaintDC dc(this); // device context for painting Mc lkEfn  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W_293["lS  
  // Center icon in client rectangle S)(.,x  
  int cxIcon = GetSystemMetrics(SM_CXICON); + /G2fhE  
  int cyIcon = GetSystemMetrics(SM_CYICON); {L971W_L  
  CRect rect; 2YL?,uLS  
  GetClientRect(&rect); U)TUOwF  
  int x = (rect.Width() - cxIcon + 1) / 2; 299H$$WS,Z  
  int y = (rect.Height() - cyIcon + 1) / 2; c2SO3g\"i  
  // Draw the icon >dXGee>'M  
  dc.DrawIcon(x, y, m_hIcon); :9afg  
 } (M|Dx\_  
 else =HK!(C  
 { J`Q>3] wL  
  CDialog::OnPaint(); $GV7o{"&  
 } 'ycJMYP8  
} 9yu\ Ot  
, u=`uD  
HCURSOR CCaptureDlg::OnQueryDragIcon() Y>z>11yEB0  
{ W.jGGt\<\  
 return (HCURSOR) m_hIcon; @)+AaC#-  
} 1q\\5A<V  
7O2/z:$f  
void CCaptureDlg::OnCancel() 8LJ8 }%*  
{ &, vcJ{.  
 if(bTray) ,oe <  
  DeleteIcon(); u]wZQl#-  
  CDialog::OnCancel(); .8g)av+  
} ~%F9%=  
!.$I["/=  
void CCaptureDlg::OnAbout() 9)yJ: N#F  
{ .~db4d]  
 CAboutDlg dlg; hW' )Sp  
 dlg.DoModal(); h8j.(  
} B4/>H|  
$p8xEcQdU#  
void CCaptureDlg::OnBrowse() T~?Ff|qFC  
{ ' {OgN}'{  
 CString str; T"Y+m-<%  
 BROWSEINFO bi; v~+(GqR=+  
 char name[MAX_PATH]; g'f@H-KCD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tIi&;tw]  
 bi.hwndOwner=GetSafeHwnd(); dbLZc$vPj  
 bi.pszDisplayName=name; OO\+J  
 bi.lpszTitle="Select folder"; YDsb3X<0'  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;V_e>TyG  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GAzU?a{S  
 if(idl==NULL) H'5)UX@LP  
  return; eIF5ZPSZi  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?,Xw[pR  
 str.ReleaseBuffer(); je-!4r,  
 m_Path=str; y1D L,%j  
 if(str.GetAt(str.GetLength()-1)!='\\') B IEO,W|  
  m_Path+="\\"; (#c*M?g3  
 UpdateData(FALSE); f`(UQJ  
} S}3fr^{.  
ssA`I<p#  
void CCaptureDlg::SaveBmp() ,,.QfUj/&  
{ FXCMR\BsQ  
 CDC dc; 7"D", 1h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]%SH>  
 CBitmap bm; (Rh,,  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2"Q|+-Io  
 int Height=GetSystemMetrics(SM_CYSCREEN); /N+dQe  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @7c?xQVd$  
 CDC tdc; mIvx1_[  
 tdc.CreateCompatibleDC(&dc); "{+QW  
 CBitmap*pOld=tdc.SelectObject(&bm); #MkTkm&r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N% B>M7-=  
 tdc.SelectObject(pOld); wu6;.xTLl  
 BITMAP btm; Paq4  
 bm.GetBitmap(&btm); 2qNt,;DQ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $Wol?)z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); j_[tu!~  
 BITMAPINFOHEADER bih; +E+p"7  
 bih.biBitCount=btm.bmBitsPixel; rKc9b<Ir  
 bih.biClrImportant=0; s^TZXCyF o  
 bih.biClrUsed=0; Wi<m{.%\E  
 bih.biCompression=0; =s{>Fsm1  
 bih.biHeight=btm.bmHeight; *Q.>-J<S  
 bih.biPlanes=1; =BeygT^  
 bih.biSize=sizeof(BITMAPINFOHEADER); Jr4Ky<G_i  
 bih.biSizeImage=size; uZYF(Yu  
 bih.biWidth=btm.bmWidth; @bLy,Xr&  
 bih.biXPelsPerMeter=0; B@))8.h]  
 bih.biYPelsPerMeter=0; XJB)rP  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gg/-k;@ Rf  
 static int filecount=0; iVr JQ  
 CString name; v~C Czg  
 name.Format("pict%04d.bmp",filecount++); :4w ?#  
 name=m_Path+name;  A@('pA85  
 BITMAPFILEHEADER bfh; Hio0HL-  
 bfh.bfReserved1=bfh.bfReserved2=0; S+6.ZZ9c  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M0"_^?  
 bfh.bfSize=54+size; y<3-?}.aZ  
 bfh.bfOffBits=54; e{H=dIa+  
 CFile bf; Zl!kJ:0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (L:>\m&NO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); n&/ `  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )q4[zv9  
  bf.WriteHuge(lpData,size); B-Hrex]  
  bf.Close(); e>OoyDZ@R  
  nCount++; UDFDJm$  
 } Z\rwO>3  
 GlobalFreePtr(lpData); 4"ZP 'I;  
 if(nCount==1) YP<ms  
  m_Number.Format("%d picture captured.",nCount); _61gF[r4!Y  
 else gJ+'W1$/  
  m_Number.Format("%d pictures captured.",nCount); V Q@   
  UpdateData(FALSE); e%M;?0j  
} =XQ%t @z0  
{S \{Ii6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?z+eWL  
{ {YC@T(  
 if(pMsg -> message == WM_KEYDOWN) ]/6z; ~3U  
 { IPpN@  
  if(pMsg -> wParam == VK_ESCAPE) y.k~Y0  
   return TRUE; !BF; >f`  
  if(pMsg -> wParam == VK_RETURN) ^7*11%Q  
   return TRUE; >Tx?%nQ  
 } TX/Xt7#R:  
 return CDialog::PreTranslateMessage(pMsg); ,p a {qne  
} 'Is kWgc  
y^ *~B(T{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %;' s4ly  
{ .{^5X)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^\% (,KNo  
  SaveBmp(); 8,%^ M9zBP  
  return FALSE; 2,F .$X  
} ;(%QD 3>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ax@$+/Z!  
 CMenu pop; ~~P5k:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kTB 0b*V  
 CMenu*pMenu=pop.GetSubMenu(0); Zx@a/jLO[n  
 pMenu->SetDefaultItem(ID_EXITICON); 'LC1(V!_j  
 CPoint pt; }<r)~{UV  
 GetCursorPos(&pt); $PPi5f}HD  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Zi i   
 if(id==ID_EXITICON) Q&;9 x?e  
  DeleteIcon(); ?V=ZIGj  
 else if(id==ID_EXIT) r u%y  
  OnCancel(); w9imKVry  
 return FALSE; *^4"5X@  
} e *C(q~PQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _H%c;z+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B3I`40#  
 AddIcon(); HC8e>kP9b  
 return res; '<<t]kK[N  
} !.gIHY  
 (ZizuHC  
void CCaptureDlg::AddIcon() F>l] 9!P|m  
{ RqrdAkg  
 NOTIFYICONDATA data; P@B]  
 data.cbSize=sizeof(NOTIFYICONDATA); reWot&;  
 CString tip; ^x,YW]AS}  
 tip.LoadString(IDS_ICONTIP); O/C rd/  
 data.hIcon=GetIcon(0); t:Q*gW Rh  
 data.hWnd=GetSafeHwnd(); A/s?x>QA  
 strcpy(data.szTip,tip); %$L{R  
 data.uCallbackMessage=IDM_SHELL; f}e`XA?  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZBthU")?  
 data.uID=98; <'*LRd$1  
 Shell_NotifyIcon(NIM_ADD,&data); 0~S^Y1hH  
 ShowWindow(SW_HIDE); \b x$i*  
 bTray=TRUE;  kJ}`V  
} ~0$&3a<n1  
FZlWsp=  
void CCaptureDlg::DeleteIcon() oc`H}Wvn  
{ F41=b4/  
 NOTIFYICONDATA data; 3 0H?KAV  
 data.cbSize=sizeof(NOTIFYICONDATA); ,"ZMRq  
 data.hWnd=GetSafeHwnd(); ?a5!H*,  
 data.uID=98; T5h H  
 Shell_NotifyIcon(NIM_DELETE,&data); 4[e X e$  
 ShowWindow(SW_SHOW); cwg"c4V  
 SetForegroundWindow(); z:*|a+cy  
 ShowWindow(SW_SHOWNORMAL); Z9|P'R(l  
 bTray=FALSE; _DtV  
} /4Gt{yg Sr  
5j(k:a+!H  
void CCaptureDlg::OnChange() ~>|ziHx  
{ 8Z~EwY*  
 RegisterHotkey(); iBa A9  
} $& td=OK  
3w'tH4C[Y  
BOOL CCaptureDlg::RegisterHotkey() C6PdDRf  
{ W6Fo6a"<  
 UpdateData(); 7. oM J  
 UCHAR mask=0; fHFE){  
 UCHAR key=0; z} #JK? u  
 if(m_bControl) k(HUUH_z  
  mask|=4; |L ev.,,Ph  
 if(m_bAlt) %ET+iIhK  
  mask|=2; g 7H(PF?  
 if(m_bShift) Z T%5T}i  
  mask|=1; /N{*"s2)  
  key=Key_Table[m_Key.GetCurSel()]; (LCfUI6;  
 if(bRegistered){ })%{AfDRF  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); JZ x[W&]zT  
  bRegistered=FALSE; AwR =]W;j  
 } 5H^ (2w  
 cMask=mask; o]V^};B  
 cKey=key; GbI/4<)l}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a7opCmL  
 return bRegistered; l/5 hp.  
} [/r(__.  
`a/`,N  
  四、小结 ^2rN>k,?  
yG{TH0tq  
  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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