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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: omFz@  
  N;R^h? '  
  一、实现方法 ==B6qX8T  
,_P-$lB  
  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: b' y%n   
W/ \g~=vo  
#pragma data_seg("shareddata") No$3"4wk  
HHOOK hHook =NULL; //钩子句柄  bLL2  
UINT nHookCount =0; //挂接的程序数目 \^LFkp  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <$YlH@;)`a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Lr+$_ t}r  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u ?"Vm  
static int KeyCount =0; >ef6{URy<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6LZCgdS{  
#pragma data_seg() H+#FSdy#  
t7pFW^&  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 C^){.UGmJ  
/}$+uBgJm  
  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: hb-%_c"kq  
gIfh3D=yX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  k'YTpO  
cKey,UCHAR cMask) zqku e%^?-  
{ 7^285)UQA  
 BOOL bAdded=FALSE; NHt\ U9l'  
 for(int index=0;index<MAX_KEY;index++){ rjP/l6 ~'  
  if(hCallWnd[index]==0){ F{wzB  
   hCallWnd[index]=hWnd; V+\Wb[zDJ  
   HotKey[index]=cKey; l}h!B_P'  
   HotKeyMask[index]=cMask; N mG#   
   bAdded=TRUE; QP x^_jA  
   KeyCount++; t-AmX) $  
   break; rOYx b }1  
  } MA\V[32H  
 } GY*p?k<i  
 return bAdded; cNrg#Asen&  
} 54,er$$V  
//删除热键 pCDmXB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @W<m 4fi  
{ ^OdP4m( >>  
 BOOL bRemoved=FALSE; }vuARZ>  
 for(int index=0;index<MAX_KEY;index++){ K"6vXv4QO  
  if(hCallWnd[index]==hWnd){ iscz}E,Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #Z#-Ht  
    hCallWnd[index]=NULL; sA~]$A;DM!  
    HotKey[index]=0; mq l Z?-  
    HotKeyMask[index]=0; Ef\ -VKh  
    bRemoved=TRUE; hP h-+Hb  
    KeyCount--; \['Cj*ek  
    break; nTas~~Q  
   } #_1`)VS  
  } )BE1Q*= n  
 } '"^'MXa  
 return bRemoved; (:_$5&i7  
} kM 6 Qp  
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VVZ'i.*_3?  
  DLL中的钩子函数如下: hgmCRC  
W^Yxny  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (Z*!#}z`  
{ ~[ jQ!tz  
 BOOL bProcessed=FALSE; |pK !S  
 if(HC_ACTION==nCode) I]575\bA  
 { ' QG?nu  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R-:2HRaA  
   switch(wParam) txpgO1  
   {  K'bP@y_cq  
    case VK_MENU: Z;i:](  
     MaskBits&=~ALTBIT; Dv"9qk  
     break; sK{e*[I>W  
    case VK_CONTROL: ZNoDFf*h  
     MaskBits&=~CTRLBIT; 'F<TSy|4kI  
     break; sB</DS  
    case VK_SHIFT: XSDpRo  
     MaskBits&=~SHIFTBIT; Y73C5.dNcE  
     break; :h$$J lP  
    default: //judge the key and send message 0f/<7R  
     break; s1rCpzK0  
   } pRqx`5 }  
   for(int index=0;index<MAX_KEY;index++){ ixFi{_  
    if(hCallWnd[index]==NULL) .8R@2c`}Cs  
     continue; D- c4EV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PsYpxNr  
    { 9p/Bh$vJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rsQtMtS2  
     bProcessed=TRUE; -"`=1l  
    } 3mgD(,(^  
   } = &]L00u.  
  } ^c<Ve'-  
  else if((lParam&0xc000ffff)==1){ //有键按下 2HdC |$_+  
   switch(wParam) /(cPfZZ  
   { 8Wx=p#_  
    case VK_MENU: A<{{iBEI`  
     MaskBits|=ALTBIT; d~H`CrQE*  
     break; 8r{.jFGv  
    case VK_CONTROL: *g%yRU{N  
     MaskBits|=CTRLBIT; %A`+WYeuX  
     break; t!XwW$@  
    case VK_SHIFT: vt8By@]:  
     MaskBits|=SHIFTBIT; n[z+<VGwC  
     break; Z~CjA%l  
    default: //judge the key and send message WMdg1J+~  
     break; JI}'dU>*U:  
   } 3$ pX  
   for(int index=0;index<MAX_KEY;index++){ NOva'qk  
    if(hCallWnd[index]==NULL) /7kC<  
     continue; p'%s=TGwv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WE?5ehEme  
    { ]/Pn EU[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); fex@,I&  
     bProcessed=TRUE; 3n _htgcv  
    } bw7@5=?;  
   } Ytkv!]"  
  } k:;r2f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \dVOwr  
   for(int index=0;index<MAX_KEY;index++){ v+XJ*N[W  
    if(hCallWnd[index]==NULL) (HVGlw'`  
     continue; X8|,   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DVA:Cmh\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :> '+"M2r  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;I}fBZ 3  
   } $i&zex{\  
  } uFE)17E  
 } C Z;6@{ o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y7|EIAU5Y  
} w{KavU5W  
Hka2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: L,\Iasv  
\hXDO_U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KoT\pY^7\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g#bRT*,L  
^W ^OfY  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: @dK Tx#gZ  
7I}uZ/N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y]>t[Lo%  
{ hb$Ce'}N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7dWS  
 { s!J9|]o  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 R_C)  
  SaveBmp(); _f83-':W6  
  return FALSE; ^('wy};  
 } dN q$}  
 …… //其它处理及默认处理 h{Y",7] !  
} D7Z /H'|  
gdc<ZYcM  
7#Ft|5$~q  
  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。 tw;}jh  
1Mzmg[L8  
  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。 [JiH\+XLPs  
f|5co>Hk  
  二、编程步骤 7.Op<  
<E~'.p,  
  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"; X'srL j.  
dV_G1'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]^E?;1$f?  
e6*8K@LHB  
  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; _>+Ld6.T6  
lxx2H1([  
  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; RZLq]8pM  
FrS]|=LJhX  
  5、 添加代码,编译运行程序。 vXs"Dst  
tmq OJ  
三、程序代码 ?s01@f#  
[,Gg^*umS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (QEG4&9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +7Gwg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @ Y+oiB~Y  
#if _MSC_VER > 1000 [0!(xp^  
#pragma once 01]f2.5  
#endif // _MSC_VER > 1000 K- v#.e4  
#ifndef __AFXWIN_H__ D*jM1w_`  
#error include 'stdafx.h' before including this file for PCH t.<i:#rj>l  
#endif 4?kcv59  
#include "resource.h" // main symbols ^#pEPVkY  
class CHookApp : public CWinApp Wr 4,YQM  
{ XFl 6M~ c  
 public: >MZ/|`[M  
  CHookApp(); h p1Bi  
  // Overrides <'u'#E@"sl  
  // ClassWizard generated virtual function overrides X'ag)|5ot  
  //{{AFX_VIRTUAL(CHookApp) BGSw~6  
 public: y29m/i:  
  virtual BOOL InitInstance(); P.cyO3l  
  virtual int ExitInstance(); -?\D\\+t  
  //}}AFX_VIRTUAL @ArSC  
  //{{AFX_MSG(CHookApp) Jy)/%p~  
  // NOTE - the ClassWizard will add and remove member functions here. O.? JmE  
  // DO NOT EDIT what you see in these blocks of generated code ! rI\FI0zIp_  
  //}}AFX_MSG {}9a6.V;}  
  DECLARE_MESSAGE_MAP() 3";q[&F9y  
}; MgZ/(X E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4#D,?eA7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dtDFoETz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /ZX }Nc g  
BOOL InitHotkey(); &>O+}>lr9  
BOOL UnInit(); m67V_s,7B  
#endif &oNAv-m^GD  
[^iN}Lz  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. hrk r'3lv  
#include "stdafx.h" wYea\^co  
#include "hook.h" 5xiEPh  
#include <windowsx.h> &=[WIG+rk  
#ifdef _DEBUG Qs!5<)6  
#define new DEBUG_NEW w0. u\  
#undef THIS_FILE +{]j]OP  
static char THIS_FILE[] = __FILE__; WJi]t93  
#endif "+c-pO`Wg  
#define MAX_KEY 100 4g/dP^  
#define CTRLBIT 0x04 mpyt5#f  
#define ALTBIT 0x02 C!gZN9-  
#define SHIFTBIT 0x01 Ry&6p>-  
#pragma data_seg("shareddata") tbr=aY$jY  
HHOOK hHook =NULL; X}]-*T|a  
UINT nHookCount =0; R2NZ{"h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey sO Y:e/_F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT bA 2pbjg=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (FV >m  
static int KeyCount =0; \U0Q<ot/7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift BtZyn7a  
#pragma data_seg() SbZ6t$"  
HINSTANCE hins; crCJrN=  
void VerifyWindow(); *8q.YuZ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4-w{BZuS  
//{{AFX_MSG_MAP(CHookApp) "@kaHIf[  
// NOTE - the ClassWizard will add and remove mapping macros here. %<5'=t'|-U  
// DO NOT EDIT what you see in these blocks of generated code! Gj*9~*xm(  
//}}AFX_MSG_MAP kfNWI#'9  
END_MESSAGE_MAP() al0L&z\  
jIyQ]:*p  
CHookApp::CHookApp() Kw}'W 8`c  
{ nN;u,}e  
 // TODO: add construction code here, zs;JJk^  
 // Place all significant initialization in InitInstance a*;b^Ze`v  
} ?2a$*(  
yZ:qU({KhD  
CHookApp theApp; iso4]>LF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @HW*09TG  
{ Efe 7gE'  
 BOOL bProcessed=FALSE; & kIFcd@  
 if(HC_ACTION==nCode) }u|q0>^8  
 { $]1=\ I  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^Cmyx3O^  
   switch(wParam) E7hhew  
   { rNM;ZPF#  
    case VK_MENU: ?%86/N>  
     MaskBits&=~ALTBIT; w!CNRtM:~  
     break; 6zkaOA46V  
    case VK_CONTROL: B!yr!DWv  
     MaskBits&=~CTRLBIT; 3T 9j@N77  
     break; -&f$GUTJ  
    case VK_SHIFT: |{;G2G1[  
     MaskBits&=~SHIFTBIT; s{++w5s  
     break; :,^gj  
    default: //judge the key and send message K,]=6 Rj  
     break; R+|hw;  
   } )[  ,A_3E  
   for(int index=0;index<MAX_KEY;index++){ g0 [w-?f  
    if(hCallWnd[index]==NULL) .hiSw  
     continue; -di o5a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mmsPLv6  
    { wBzC5T%,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]9L oZ)  
     bProcessed=TRUE; fVwU e _Y  
    } Q\)F;:|  
   } 'yth'[  
  } B *vM0  
  else if((lParam&0xc000ffff)==1){ //Key down $(9U@N9E  
   switch(wParam) !W0v >p  
   { A >$I -T+  
    case VK_MENU: +"(jjxJm  
     MaskBits|=ALTBIT; !BI;C(,RL  
     break; #g=XUZ/"  
    case VK_CONTROL: V]N?6\Op  
     MaskBits|=CTRLBIT; |o @%dH  
     break; *VeRVaBl  
    case VK_SHIFT:  ]k(]qZ  
     MaskBits|=SHIFTBIT; bcR_E5x$  
     break; % nIf)/2g  
    default: //judge the key and send message AS,%RN^.  
     break; ;=@0'xPEa-  
   } -8Xf0_  
   for(int index=0;index<MAX_KEY;index++) +#By*;BJ  
   { vy/-wP|1  
    if(hCallWnd[index]==NULL) hcc/=_hA  
     continue; N7_"H>O$0U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S$3JMFA  
    { :KN-F86i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7.T?#;'3  
     bProcessed=TRUE; C?Ucu]cW  
    } :LTN!jj  
   } nm+s{  
  } -hV*EPQ/  
  if(!bProcessed){ ]?)TdJ`  
   for(int index=0;index<MAX_KEY;index++){ <Qq*p  
    if(hCallWnd[index]==NULL) C>~TI,5a3  
     continue; />Nt[o[r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xpI wrJO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P$sxr  
   } {T8Kk)L  
  } m68*y;#  
 } zVD:#d% b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S$k&vc(0  
} [2koe.?(  
$|@ r!/W  
BOOL InitHotkey() PX99uWx5]  
{ qNr} \J|  
 if(hHook!=NULL){ {U1m.30n  
  nHookCount++; XM}hUJJW  
  return TRUE; Q^I\cAIB  
 } a6H%5N  
 else ,P Z ge  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BC]?0 U  
  if(hHook!=NULL) x:7IIvP  
   nHookCount++; {|\.i  
  return (hHook!=NULL); 8] ikygt"  
} J=L5=G7(  
BOOL UnInit() '!$%> ||S  
{ H:G1BZjq  
 if(nHookCount>1){ ;wVwX6:ZKr  
  nHookCount--; T Ge_G_'o  
  return TRUE; gJhiGYx  
 } fX)# =c|5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Wvqhl 'J  
 if(unhooked==TRUE){ Hef g[$m  
  nHookCount=0; p8Q1-T3v  
  hHook=NULL; Gc!x|V;T  
 } hEk$d.!}  
 return unhooked; ZN6Z~SL_i~  
} };g"GNy  
iI>A *,{,`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Jo}eeJ;k  
{ T>GM%^h,7-  
 BOOL bAdded=FALSE; d %#b:(,  
 for(int index=0;index<MAX_KEY;index++){ "] iB6  
  if(hCallWnd[index]==0){ Bj~+WwD)QR  
   hCallWnd[index]=hWnd; 8Eq7Sa  
   HotKey[index]=cKey; EzIGz[  
   HotKeyMask[index]=cMask; y?:.;%!E  
   bAdded=TRUE; x m@_IL&P  
   KeyCount++; qFNes)_r  
   break; 2 FFD%O05  
  } g1o8._f.  
 } 3,=6@U  
 return bAdded; $g7<Y*t[  
} frQ{iUx  
H.2QKws^F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J$!iq|  
{ '{`$#@a.  
 BOOL bRemoved=FALSE; ;GhNKPY  
 for(int index=0;index<MAX_KEY;index++){ 7)k\{&+P  
  if(hCallWnd[index]==hWnd){ km40qO@3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ XrPfotj1  
    hCallWnd[index]=NULL; r9lR|\Ax2U  
    HotKey[index]=0; ]q-Y }1di8  
    HotKeyMask[index]=0; ^H' \"9;7  
    bRemoved=TRUE; h} EPnC}  
    KeyCount--; ~nPtlrQa#*  
    break; %#}Zy   
   } qv"$Bd:]r  
  } _~ &iq1  
 } <9%R\_@$H  
 return bRemoved; &M '*6A  
} {V-v-f  
`p7=t)5k  
void VerifyWindow() V!dtF,tH  
{ 5D l/aHb  
 for(int i=0;i<MAX_KEY;i++){ CA#,THty  
  if(hCallWnd!=NULL){ nvUc\7(%NW  
   if(!IsWindow(hCallWnd)){ 'eX '  
    hCallWnd=NULL; FE{FGM q  
    HotKey=0; (M ~e?s  
    HotKeyMask=0; J'2X&2  
    KeyCount--; l\?c}7k  
   } p"Z-6m~  
  } eN~=*Mn(za  
 } 3{h_&Gbo'D  
} !L8#@BjU  
$pudoAO  
BOOL CHookApp::InitInstance() }{< '8J.R  
{ So 5N5,u@=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); PY0j 9$i?  
 hins=AfxGetInstanceHandle(); o+9j?|M  
 InitHotkey(); xRsWI!d+|  
 return CWinApp::InitInstance(); Jq^T1_iqn  
} orvp*F{7[H  
$2el&I  
int CHookApp::ExitInstance() - CWywuD  
{ y|q3Wa  
 VerifyWindow(); ?NP1y9Y]i  
 UnInit(); rc>6.sM %  
 return CWinApp::ExitInstance(); \B 7tX  
} )];K .zP  
jZ3fKyp#   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0P(!j_2m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1>&]R=  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O,A{3DAe0  
#if _MSC_VER > 1000 ~3S~\0&|  
#pragma once -B\HI*u  
#endif // _MSC_VER > 1000 i@R 1/M  
c7E11 \%&Z  
class CCaptureDlg : public CDialog OaZQ7BGq  
{ )tnh4WMh}  
 // Construction ?KI,cl  
 public: aoa)BNs  
  BOOL bTray; d5z`BH.  
  BOOL bRegistered; dw7$Vh0y  
  BOOL RegisterHotkey(); a+PzI x2  
  UCHAR cKey; hDq`Z$_+KX  
  UCHAR cMask; 0nD/;\OU  
  void DeleteIcon(); tlt*fH$ .  
  void AddIcon(); o7LuKRl   
  UINT nCount; ^w06<m  
  void SaveBmp(); :<#nTh_@\'  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor B !=F2  
  // Dialog Data uc"P3,M  
  //{{AFX_DATA(CCaptureDlg) XEZF{lP  
  enum { IDD = IDD_CAPTURE_DIALOG }; .@Dxp]/B}  
  CComboBox m_Key; 0k(a VkZ I  
  BOOL m_bControl; 19KQlMO.G  
  BOOL m_bAlt; 9]wN Bd  
  BOOL m_bShift; b,%C{mC  
  CString m_Path; +XYE{E5  
  CString m_Number; ")HFYqP>9  
  //}}AFX_DATA ~<OSYb  
  // ClassWizard generated virtual function overrides L`EBfz\n  
  //{{AFX_VIRTUAL(CCaptureDlg) )Iq<+IJ  
 public: :Qf '2.h)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f.`*Qg L  
 protected: 78%~N`x7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <nK?LcP  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mcX/GO}  
  //}}AFX_VIRTUAL 9lDhIqx0~  
  // Implementation = +?7''{>  
 protected: 9v!1V,`j"  
  HICON m_hIcon; !GEJIefx_  
  // Generated message map functions e,XYVWY%  
  //{{AFX_MSG(CCaptureDlg) w~?~g<q  
  virtual BOOL OnInitDialog(); xLZG:^(I  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a"g!e^  
  afx_msg void OnPaint(); *%t^;&x?  
  afx_msg HCURSOR OnQueryDragIcon(); M>8A\;"  
  virtual void OnCancel(); %\Mo-Ow!\  
  afx_msg void OnAbout(); 6;qy#\}2  
  afx_msg void OnBrowse(); B[?CbU  
  afx_msg void OnChange(); Y,e B|  
 //}}AFX_MSG 0|\$Vp  
 DECLARE_MESSAGE_MAP() Uwx E<=z  
}; Y0K[Sm>  
#endif 1,!(0 5H  
:+|Z@KB  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [o5Hl^  
#include "stdafx.h"  A4<Uu~  
#include "Capture.h" m&?r%x  
#include "CaptureDlg.h" A1?2*W  
#include <windowsx.h> ;H.^i|_/  
#pragma comment(lib,"hook.lib") ZH)="qx [  
#ifdef _DEBUG &&RimoIeo  
#define new DEBUG_NEW 0f>5(ek  
#undef THIS_FILE Y6L ~K?  
static char THIS_FILE[] = __FILE__; oW Nh@C  
#endif 8rS:5:Hi  
#define IDM_SHELL WM_USER+1 r[Hc>wBv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t; {F%9j{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'V=P*#|SR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =j*$ |X3W  
class CAboutDlg : public CDialog Eq\M;aDq  
{ QM#4uI55B  
 public: c[1oww  
  CAboutDlg(); V0XvJ  
  // Dialog Data 6}Y#=}  
  //{{AFX_DATA(CAboutDlg) O ,h;hQZ  
  enum { IDD = IDD_ABOUTBOX }; :| 8M`18lZ  
  //}}AFX_DATA <r`2)[7N  
  // ClassWizard generated virtual function overrides zY!j:FT1HY  
  //{{AFX_VIRTUAL(CAboutDlg) FfPar:PHj  
 protected: k<{{*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support spPNr  
  //}}AFX_VIRTUAL oVfLnI ;  
  // Implementation o;R2p $  
 protected: hL;(C) (  
  //{{AFX_MSG(CAboutDlg) o,8TDg  
  //}}AFX_MSG ><$d$(  
  DECLARE_MESSAGE_MAP() in-HUG  
}; "#oHYz3D  
zZ323pq  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ouFYvtFg  
{ ]cMqahaY  
 //{{AFX_DATA_INIT(CAboutDlg) f-n1I^|  
 //}}AFX_DATA_INIT * 8_wYYH  
} R1GEh&U{  
4X |(5q?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) os={PQRD  
{ g($DdKc|g  
 CDialog::DoDataExchange(pDX); }$Tl ?BRpU  
 //{{AFX_DATA_MAP(CAboutDlg) |NC*7/}  
 //}}AFX_DATA_MAP :G2k5xD/E  
} 'd$P`Vw:  
PFne+T!2F  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5BKt1%Pg  
 //{{AFX_MSG_MAP(CAboutDlg) iJ3e1w$  
 // No message handlers c+$*$|t=v`  
 //}}AFX_MSG_MAP C$D -Pt"+  
END_MESSAGE_MAP() ?9\EN|O^  
tL)t"  i  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2Kyl/C,  
: CDialog(CCaptureDlg::IDD, pParent) j<@lX^  
{ s`'{I8'p/  
 //{{AFX_DATA_INIT(CCaptureDlg) ft KTnK.  
  m_bControl = FALSE; ~W+kiTsD?  
  m_bAlt = FALSE; j=aI9p  
  m_bShift = FALSE; d0Qd$ .%A  
  m_Path = _T("c:\\"); W=vP]x >J  
  m_Number = _T("0 picture captured."); IrhA+)pdse  
  nCount=0; hB>oJC  
  bRegistered=FALSE; iQ fJ  
  bTray=FALSE; C3],n   
 //}}AFX_DATA_INIT ~SF<,-Kg  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 I3mGo  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @jSYB+D  
} sVv xHkt@  
ime\f*Fg  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ua]o6GlO  
{ _EMwm&!  
 CDialog::DoDataExchange(pDX); $?<Z!*x  
 //{{AFX_DATA_MAP(CCaptureDlg) .=;3d~.]  
  DDX_Control(pDX, IDC_KEY, m_Key); u!X|A`o5i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qHrA%k^!2O  
  DDX_Check(pDX, IDC_ALT, m_bAlt); NzSoqh{R  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); N<|Nwq:NN  
  DDX_Text(pDX, IDC_PATH, m_Path); lWc:$qnR-K  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )V6Hl@v  
 //}}AFX_DATA_MAP Id|L`  w  
} C=It* j55  
tEKmy7'#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G) 7;;  
//{{AFX_MSG_MAP(CCaptureDlg) TbGn46!:  
 ON_WM_SYSCOMMAND() Dg?70v <a  
 ON_WM_PAINT() JB`\G=PiL  
 ON_WM_QUERYDRAGICON() Q/_f zg  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `-l6S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) x+x40!+\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) v` 7RCg`  
//}}AFX_MSG_MAP ie\"$i.98H  
END_MESSAGE_MAP() PCM-i{6/  
RyK\uv  
BOOL CCaptureDlg::OnInitDialog() af+IP_6 .  
{ ws|;  `  
 CDialog::OnInitDialog(); Uo>] sNP~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +W\f(/q0  
 ASSERT(IDM_ABOUTBOX < 0xF000); Vle@4 ]M\  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  Q&g^c2  
 if (pSysMenu != NULL) d%,eZXg'  
 { WKIoS"?-F  
  CString strAboutMenu; tj4VWJK  
  strAboutMenu.LoadString(IDS_ABOUTBOX); dhr3,&+T2  
  if (!strAboutMenu.IsEmpty()) CS-uNG6  
  { ayD}r#7  
   pSysMenu->AppendMenu(MF_SEPARATOR); }mdAM6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,Bo>E:u  
  }  H77"  
 } .CU5}Tv-  
 SetIcon(m_hIcon, TRUE); // Set big icon mkF"   
 SetIcon(m_hIcon, FALSE); // Set small icon qX   
 m_Key.SetCurSel(0); Boz@bl mCB  
 RegisterHotkey(); wl$h4 {L7  
 CMenu* pMenu=GetSystemMenu(FALSE); &n?^$LTPY  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9 ;Ox;;w  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :Q_<Z@2Y{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M9@ri^x  
 return TRUE; // return TRUE unless you set the focus to a control TGe;HZ  
} T{Uc:Z  
c|62jY"$-2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *2Ht &  
{ rZ^v?4Z\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I_rO!  
 { fCtPu08{Z  
  CAboutDlg dlgAbout; <-S%kA8  
  dlgAbout.DoModal(); a@*S+3  
 } 4^Q :  
 else  {=QiZWu  
 { qt 2d\f  
  CDialog::OnSysCommand(nID, lParam); S.q].a  
 } ct,l^|0Hu8  
} WjwLM2<nK7  
Z%Zd2 v  
void CCaptureDlg::OnPaint() `Ru3L#@  
{ nMvKTH  
 if (IsIconic()) {0^&SI"5`E  
 { GF%314Xu  
  CPaintDC dc(this); // device context for painting I{ :(z3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .j>hI="b  
  // Center icon in client rectangle /&{$ pM|?  
  int cxIcon = GetSystemMetrics(SM_CXICON); )!:Lzi  
  int cyIcon = GetSystemMetrics(SM_CYICON); lBFMwJU)  
  CRect rect; q^L<X)  
  GetClientRect(&rect); (tGY%oT"  
  int x = (rect.Width() - cxIcon + 1) / 2; P(73!DT+  
  int y = (rect.Height() - cyIcon + 1) / 2; oK%K}{`  
  // Draw the icon hcbv;[bG  
  dc.DrawIcon(x, y, m_hIcon); A\#P*+k0  
 } o b|BXF  
 else Xo*%/0q'  
 { dwd:6.J(  
  CDialog::OnPaint(); P*Tx14xe4  
 } 7C2&NyWJ  
} >Ll$p 0W  
@wC5 g 4E  
HCURSOR CCaptureDlg::OnQueryDragIcon() i'wAE:Xe  
{ g9WGkH F  
 return (HCURSOR) m_hIcon; |{ PI102  
} ['*8IWg  
w{90`  
void CCaptureDlg::OnCancel() z7Eg5rm|QZ  
{ g HbxgeL  
 if(bTray) 6 ]pX>Xho  
  DeleteIcon(); Y.U[wL>  
  CDialog::OnCancel(); T%n2$  
} {Gw.l."  
Xy &uZ  
void CCaptureDlg::OnAbout() V-r3-b  
{ <u:WlaS  
 CAboutDlg dlg; 0#*#a13  
 dlg.DoModal(); F. =Bnw/-  
} RxN,^!OV  
SdwS= (e6  
void CCaptureDlg::OnBrowse() %8M)2 ?E  
{ ^ Dt#$Z  
 CString str; lmSo8/%T  
 BROWSEINFO bi; n[,w f9  
 char name[MAX_PATH]; JS>Gd/Jd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _fP&&}  
 bi.hwndOwner=GetSafeHwnd(); yxq}QSb \3  
 bi.pszDisplayName=name; `VL}.h  
 bi.lpszTitle="Select folder"; zf>5,k'x'A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \7 NpT}dj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v[n7"  
 if(idl==NULL) @*DyZB  
  return; \ y{Tn@7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T=:]]nf?M  
 str.ReleaseBuffer(); )Cw`"n  
 m_Path=str; ;kJA'|GX  
 if(str.GetAt(str.GetLength()-1)!='\\') eD Z8w  
  m_Path+="\\"; 0W()lQ   
 UpdateData(FALSE); `\6?WXk3T  
} rJInj>|{=  
eBO@7F$  
void CCaptureDlg::SaveBmp() z>06hBv(?Y  
{ "AhTH.ZP  
 CDC dc; !'*csg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~|AwN [  
 CBitmap bm; r]Ff{la5  
 int Width=GetSystemMetrics(SM_CXSCREEN); @hImk`&[N  
 int Height=GetSystemMetrics(SM_CYSCREEN); #vqo -y7@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ([V V%ovZ  
 CDC tdc; lM[XS4/TRa  
 tdc.CreateCompatibleDC(&dc); b4""|P?L  
 CBitmap*pOld=tdc.SelectObject(&bm); /Y2/!mU</  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *I0-O*Xr  
 tdc.SelectObject(pOld); rUjdq/I:Z  
 BITMAP btm; oejfU;+$  
 bm.GetBitmap(&btm); M}wXJ8aF?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5 VA(tzmCt  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q0bHB_|wL  
 BITMAPINFOHEADER bih; ?`Y\)'}   
 bih.biBitCount=btm.bmBitsPixel; <x),,a=X  
 bih.biClrImportant=0; :g\rQazxO  
 bih.biClrUsed=0; LR,7,DH$9'  
 bih.biCompression=0; ')$NfarQ.  
 bih.biHeight=btm.bmHeight; lw(e3j  
 bih.biPlanes=1; ^v@4|E$  
 bih.biSize=sizeof(BITMAPINFOHEADER); F("#^$  
 bih.biSizeImage=size; [|3>MZ2/  
 bih.biWidth=btm.bmWidth; 92'wkS  
 bih.biXPelsPerMeter=0; KYxBVgJ  
 bih.biYPelsPerMeter=0; GBC*>Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N=)z  
 static int filecount=0; i o3yLIy,  
 CString name; *+b6B_u]  
 name.Format("pict%04d.bmp",filecount++); <p?&udqD  
 name=m_Path+name;  X}6#II  
 BITMAPFILEHEADER bfh; 8g >b  
 bfh.bfReserved1=bfh.bfReserved2=0; [!VOw@uz  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U#o'H @  
 bfh.bfSize=54+size; :9|W#d{o  
 bfh.bfOffBits=54; j` /&r*zNq  
 CFile bf; [;b=A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ kV Rn`n0  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zK+52jhi  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5b6s4ZyV  
  bf.WriteHuge(lpData,size); Ih[+K#t+E  
  bf.Close(); Zzl,gy70  
  nCount++; -)y%~Zn  
 } ib0g3p-Lc  
 GlobalFreePtr(lpData); 'iLH `WE  
 if(nCount==1) {hO`6mr&t  
  m_Number.Format("%d picture captured.",nCount); t=#Pya  
 else \ U-vI:J_  
  m_Number.Format("%d pictures captured.",nCount); il:nXpM!  
  UpdateData(FALSE); (,xZGa  
} mty1p'^KQ  
qUF1XJZ }z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0X(]7b&~R  
{ lKEa)KF[  
 if(pMsg -> message == WM_KEYDOWN) =qvZpB7ZZ  
 { qOG}[%<^n7  
  if(pMsg -> wParam == VK_ESCAPE) [W,-1.$!dM  
   return TRUE; n|4;Hn1V  
  if(pMsg -> wParam == VK_RETURN) hD<f3_k  
   return TRUE; XL}<1- }  
 } L6i|:D32p  
 return CDialog::PreTranslateMessage(pMsg); %E27.$E_  
} ".~{:=  
uC]Z8&+obb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7=*VpX1  
{ | H ;+1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7XyOB+aQO  
  SaveBmp(); 4o9$bv  
  return FALSE; I 2HT2c$  
} Cj;/Uhs  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ UlQQP^Na  
 CMenu pop; swpnuuC-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B">yKB:D}t  
 CMenu*pMenu=pop.GetSubMenu(0); 3An(jt$%Q  
 pMenu->SetDefaultItem(ID_EXITICON); 1;W=!Fx  
 CPoint pt; Z#Lx_*p]Q  
 GetCursorPos(&pt); 8Xm@r#Oy5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u=qPzmywt  
 if(id==ID_EXITICON)  c!uW}U_z  
  DeleteIcon(); )8{6+{5lu  
 else if(id==ID_EXIT) j:1uP^.  
  OnCancel(); =`I?mn&  
 return FALSE; 3,.% s  
} -0,4eg j3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +EASAq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8kW/DcLE  
 AddIcon(); uf@U:V  
 return res; 27#8dV?  
} h#3m4<w(9  
|j_`z@7(  
void CCaptureDlg::AddIcon() hE!7RM+Y  
{ ]X" / yAn  
 NOTIFYICONDATA data; %3a|<6  
 data.cbSize=sizeof(NOTIFYICONDATA); (clU$m+oXX  
 CString tip; Ls: =A6AGM  
 tip.LoadString(IDS_ICONTIP); ->yeJTsE9  
 data.hIcon=GetIcon(0); {&nV4c$v  
 data.hWnd=GetSafeHwnd(); \/Ij7nD`l%  
 strcpy(data.szTip,tip); MMD<I6Iyv  
 data.uCallbackMessage=IDM_SHELL; zd`=Ih2Wx  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Gz dgL"M[  
 data.uID=98; .T3=Eq&"W  
 Shell_NotifyIcon(NIM_ADD,&data); t^@T`2jL  
 ShowWindow(SW_HIDE); c#q"\"  
 bTray=TRUE; 6d{j0?mM  
} ?TuI:dC  
"]]q} O?  
void CCaptureDlg::DeleteIcon() & QY#3yj=  
{ 1| xN%27>  
 NOTIFYICONDATA data; U4wpjHg  
 data.cbSize=sizeof(NOTIFYICONDATA); x9}++r  
 data.hWnd=GetSafeHwnd(); :z~!p~  
 data.uID=98; X N;/nU  
 Shell_NotifyIcon(NIM_DELETE,&data); sA_X<>vAKJ  
 ShowWindow(SW_SHOW); :k1$g+(lP  
 SetForegroundWindow(); ,z66bnjO  
 ShowWindow(SW_SHOWNORMAL); dB`b9)Tk0z  
 bTray=FALSE; VBx,iuaw  
} [$2qna2VP  
VC=6uB  
void CCaptureDlg::OnChange() ${e&A^h  
{ %\yK5V5  
 RegisterHotkey(); !P"?  
} {aJz. `u\  
l @A"U)A(  
BOOL CCaptureDlg::RegisterHotkey() /;+,mp4  
{ %UmbDGDWI  
 UpdateData(); j_pw^I$C  
 UCHAR mask=0; y#r\b6  
 UCHAR key=0; .cw=*<zeg  
 if(m_bControl) \G=bj;&eF  
  mask|=4; ' PL_~  
 if(m_bAlt) `GkRmv*  
  mask|=2; i;HH ! TaN  
 if(m_bShift) m~Me^yt>}  
  mask|=1; td/5Bmj  
  key=Key_Table[m_Key.GetCurSel()]; QX/]gX  
 if(bRegistered){ B'/Icg.T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x9\J1\  
  bRegistered=FALSE; n +d J c  
 } (lb`#TTGx  
 cMask=mask; 2?H@$-x>  
 cKey=key; D`fc7m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ei|0L$NCg  
 return bRegistered; 1G_xP^H!  
} Rh yegD  
&}|0CR.(  
  四、小结 YrKFa%k  
,{TQ ~LP  
  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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