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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: ST [1'T+L  
  Y Z2VP  
  一、实现方法 1Qe!  
2 n+XML  
  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: )cmLo0`$  
l$~bkVNL  
#pragma data_seg("shareddata") |"E9DD]{  
HHOOK hHook =NULL; //钩子句柄 rls#g w  
UINT nHookCount =0; //挂接的程序数目 > mDubP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 />I8nS}T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 xr-`i  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey qO3BQ]UF  
static int KeyCount =0; o 0 #]EMr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U4I` xw'  
#pragma data_seg() s=@Ce V@4W  
Y/I6.K3  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 tNf" X !  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Lj1 @yokB  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,%G2>PBt  
cKey,UCHAR cMask) 6zZR:ej  
{ BiCa "  
 BOOL bAdded=FALSE; ;+KgujfU  
 for(int index=0;index<MAX_KEY;index++){ U jzz`!mz  
  if(hCallWnd[index]==0){ ]<z(Rmn`Q  
   hCallWnd[index]=hWnd; R'HA>?D  
   HotKey[index]=cKey; D ;I;,Z  
   HotKeyMask[index]=cMask; 9+Hb`  
   bAdded=TRUE; MF sy`aiS  
   KeyCount++; x`l; ;  
   break; U+M?<4J) "  
  } yzl\{I&  
 } ryLNMh  
 return bAdded; Ou,_l  
} C}EDl2  
//删除热键 xTJ5VgG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 80>!qG  
{ s""8V_,;  
 BOOL bRemoved=FALSE; n{ WJ.Y*  
 for(int index=0;index<MAX_KEY;index++){ *lF%8k"Al  
  if(hCallWnd[index]==hWnd){ ZU'^%)6~o~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]arskmB]  
    hCallWnd[index]=NULL; &JM;jS z  
    HotKey[index]=0; ' uw&f;/E  
    HotKeyMask[index]=0; hkI);M+@6  
    bRemoved=TRUE; DQnWLC"u  
    KeyCount--; a/#,Y<kJ  
    break; Wy )g449  
   } N\&;R$[9:  
  } Z"T(8>c;g  
 } )KQum`pO  
 return bRemoved; mj|9x1U)  
} P9wDTZ :4  
dig76D_[e  
!2Iwur u  
  DLL中的钩子函数如下: Mp=+*I[  
~-i?=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XePBA J  
{ Jj:4@p:  
 BOOL bProcessed=FALSE; X  jN.X  
 if(HC_ACTION==nCode) Q6>( Z  
 { 5 Vqvb|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zxdO3I  
   switch(wParam) Jl ?Q}SB  
   {  x0GZ2*vfsb  
    case VK_MENU: bf(&N-"A  
     MaskBits&=~ALTBIT; DL_\luh  
     break; Ts6X:D4,  
    case VK_CONTROL: V1;-5L75  
     MaskBits&=~CTRLBIT; AFED YRX  
     break; RfRaWbn  
    case VK_SHIFT: T,>e\  
     MaskBits&=~SHIFTBIT; 4*W7{MPY  
     break; $@wkQ%  
    default: //judge the key and send message fh<G& E8 p  
     break; bnQO}G  
   } `I$A;OPK7  
   for(int index=0;index<MAX_KEY;index++){ =1capix 1r  
    if(hCallWnd[index]==NULL) !o!04_  
     continue; gs >cx]>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~!kbB4`WK  
    { ;v\n[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N/VIP0Kb  
     bProcessed=TRUE; -Ma"V  
    } tEs$+b  
   } V.1sZYA9  
  } FU3B;Fn^Z(  
  else if((lParam&0xc000ffff)==1){ //有键按下 p6)UR~9Rs  
   switch(wParam) p<e~x/@m*  
   { A[bxxQSP\H  
    case VK_MENU: A?zW!'  
     MaskBits|=ALTBIT; CG;D(AWR;  
     break; A>puk2s  
    case VK_CONTROL: oMbCljUC  
     MaskBits|=CTRLBIT; rg~CF<  
     break; (C%'I  
    case VK_SHIFT: i$bBN$<b<  
     MaskBits|=SHIFTBIT; H_FhHX.2(  
     break; 8 Hn{CJ~'  
    default: //judge the key and send message Q<pM tW  
     break; +n dyR  
   } r N7"%dx  
   for(int index=0;index<MAX_KEY;index++){ D6WsEd>  
    if(hCallWnd[index]==NULL) \2!$HA7P  
     continue; ?Dm&A$r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qfU3Cwy  
    { }d(6N&;"zN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]'q<wPi  
     bProcessed=TRUE; =qRVKz  
    } x3 S  
   } e+[J9;g  
  } -E7\ .K3  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f]}F_]  
   for(int index=0;index<MAX_KEY;index++){ *$!LRmp?  
    if(hCallWnd[index]==NULL) ?H&p zY~H  
     continue; vkK+ C~"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _c2#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YaU A}0cW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 G. }yNjL8  
   } c z|IBsa*  
  } '<Gqu_-  
 } L;"<8\vWB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P7b2I=t  
} pP @#|T  
!NCT) #G`  
  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- l}xBf  
;Yj}9[p;T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "{k3~epYaN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `4CRpz  
J:5n/m^A  
  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: c nzPq\  
dY,'6 JzC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Fv9Z'#t  
{ D&shrKFx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [3.rG!Na  
 { v>XE]c_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [Z 0 e$  
  SaveBmp(); ZZTV >:  
  return FALSE; -cKR15  
 } ",}VB8K  
 …… //其它处理及默认处理 181P;R=}<  
} YblRwic  
ciTQH (G  
^.(]i \V_  
  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。 L8W3Tpi&(  
W{0:8_EI  
  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。 78%2#;;G  
^{s)`j'I*  
  二、编程步骤 ~K[rQ  
[D t`@Dm  
  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"; !rWib` %  
a-3~HH  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; & zG=  
9qpH 8j+  
  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; "\9@gfsp)  
G2Apm`/ y  
  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.9J}k1S  
Cpj_mMtu  
  5、 添加代码,编译运行程序。 .C #}g  
\||PW58j  
三、程序代码 dw&Xg_$  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL WFkXz*7B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Pwq} ;+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ OD i)#  
#if _MSC_VER > 1000 {M$1?j"7  
#pragma once ; etH)  
#endif // _MSC_VER > 1000 O^f@ g l  
#ifndef __AFXWIN_H__ '~@WJKk  
#error include 'stdafx.h' before including this file for PCH yqK82z5U*R  
#endif p])km%zB(  
#include "resource.h" // main symbols '1w<<?vX?  
class CHookApp : public CWinApp u&qdrKx  
{ \z_@.Jw{  
 public: >$?Z&7Lv  
  CHookApp(); L+,{*Uj[;  
  // Overrides [)*fN|Hy  
  // ClassWizard generated virtual function overrides -B_dE-l,  
  //{{AFX_VIRTUAL(CHookApp) 4QDW}5xB  
 public: f5G17: Q  
  virtual BOOL InitInstance(); `jV0;sPd;  
  virtual int ExitInstance(); qg>i8V  
  //}}AFX_VIRTUAL MB#%k#z`B  
  //{{AFX_MSG(CHookApp) 53L)+\7w  
  // NOTE - the ClassWizard will add and remove member functions here. 8\yH 7H  
  // DO NOT EDIT what you see in these blocks of generated code ! %B~`bUHjq  
  //}}AFX_MSG SQeQ"k|P%  
  DECLARE_MESSAGE_MAP() FSM~Rl  
}; toQn]MT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P`"dj@1'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l"cYW9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x[vX|oE!A  
BOOL InitHotkey(); mU3UQ j  
BOOL UnInit(); )QX9T  
#endif 'C[gcp  
rGN-jb)T+  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. nBNZ@nD  
#include "stdafx.h" ^=tyf&"  
#include "hook.h" 6sPd")%G  
#include <windowsx.h> l/TH"z(  
#ifdef _DEBUG We" "/X  
#define new DEBUG_NEW wHAh6lm  
#undef THIS_FILE 'n=FBu ^  
static char THIS_FILE[] = __FILE__; bDr'W   
#endif D`LwW` 9  
#define MAX_KEY 100 rz3&khi  
#define CTRLBIT 0x04 _r ajm J  
#define ALTBIT 0x02 :dK%=j*ZK  
#define SHIFTBIT 0x01 Pd3t~1TaW  
#pragma data_seg("shareddata") N8KHNTb-M  
HHOOK hHook =NULL; wo*/{KFvh  
UINT nHookCount =0; akNJL\b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey i3kI{8h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @ O%m,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xOkf 9k_  
static int KeyCount =0; E&97;VH  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift u^{Q|o:=x  
#pragma data_seg() \>\w-ty[(  
HINSTANCE hins; vbSz&+52;  
void VerifyWindow(); >z( 6ADq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  UWu|w  
//{{AFX_MSG_MAP(CHookApp) #a/lt^}C*  
// NOTE - the ClassWizard will add and remove mapping macros here. HHX9QebiST  
// DO NOT EDIT what you see in these blocks of generated code! A\=:h  AQ  
//}}AFX_MSG_MAP 0AaN  
END_MESSAGE_MAP() 1s*I   
ftK.jj1:  
CHookApp::CHookApp() }$b/g  
{ M]6=Rxq1:E  
 // TODO: add construction code here, $H_4Y-xOi  
 // Place all significant initialization in InitInstance >s1HQSe66  
} Tp9LBF  
B[k"xs  
CHookApp theApp; D$j`+`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z\;kjI  
{ (V |P6C  
 BOOL bProcessed=FALSE; /]YK:7*98  
 if(HC_ACTION==nCode) p,xM7V"O)  
 { j Sddjs  
  if((lParam&0xc0000000)==0xc0000000){// Key up s_RYYaM  
   switch(wParam) $+?6U  
   { 7}nOF{RH]  
    case VK_MENU: /A_ IS`  
     MaskBits&=~ALTBIT; M14pg0Q  
     break; ~ 9'64  
    case VK_CONTROL: UH[ YH;3O  
     MaskBits&=~CTRLBIT; <q_H 3|  
     break; (=p}b:Z  
    case VK_SHIFT: * yt/ Dj  
     MaskBits&=~SHIFTBIT; I{M2nQi  
     break; {8t;nsdm!  
    default: //judge the key and send message Ue8_Q8q5  
     break; ;  I=z  
   } E fqa*,k  
   for(int index=0;index<MAX_KEY;index++){ c>]_,Br~  
    if(hCallWnd[index]==NULL) mNV4"lNR  
     continue; TsR20P@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y{kXd1,  
    { (2%C% #]8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O *jNeYA  
     bProcessed=TRUE; p4t(xm2T  
    } | WDX@Q  
   } #8[,w.X  
  } %,>,J`  
  else if((lParam&0xc000ffff)==1){ //Key down RI%* 5lM8;  
   switch(wParam) P~?u2,.E[  
   { #ReW#?P%b/  
    case VK_MENU: =r GkM.^  
     MaskBits|=ALTBIT; ~r!jVK>^  
     break; $-o39A#  
    case VK_CONTROL: G"J6X e  
     MaskBits|=CTRLBIT; I2zSoQ1P  
     break; Jq.26I=  
    case VK_SHIFT: #{N#yReh  
     MaskBits|=SHIFTBIT; \Z)'':},C  
     break; ^up*KQ3u\  
    default: //judge the key and send message N["(ZSS   
     break; :s8,i$Ex  
   } "i#!  
   for(int index=0;index<MAX_KEY;index++) <nIU]}q  
   { n+xM))  
    if(hCallWnd[index]==NULL) mv + .5X  
     continue; SLBKXj|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !lHsJ)t  
    { OxqP:kM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W}(dhgf  
     bProcessed=TRUE; Z3[,Xw  
    } :Z&ipd!yY  
   } w$2-t  
  } 1a%*X UT  
  if(!bProcessed){ @89mj{  
   for(int index=0;index<MAX_KEY;index++){ )L_jR%2j  
    if(hCallWnd[index]==NULL) Wlt shZo  
     continue; hI/p9 `w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {x-g?HB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rNI3_|a  
   } 2Q<_l*kk(  
  } smk0*m4  
 } bEPXNN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a3p|>M6E  
} R$PiF1ffj  
d'DS7F(c{  
BOOL InitHotkey() ^QXUiXzl  
{ |Z!C`G[  
 if(hHook!=NULL){ ?5Lom#^  
  nHookCount++; vR:t4EJ`  
  return TRUE; q!Nwf XJM  
 } qf ]ax!bK  
 else {'{ssCL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); g%^Zq"  
  if(hHook!=NULL) h~<#1'/<  
   nHookCount++; .llAiv  
  return (hHook!=NULL); rJZ-/]Xf!6  
} [D /q%  
BOOL UnInit() 3`-[95w  
{ |n]^gTJt  
 if(nHookCount>1){ oq;}q  
  nHookCount--; t XfB.[U  
  return TRUE; {K:/(\  
 } |"l g4S%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); hX YVi6(k  
 if(unhooked==TRUE){ I8?egDkk  
  nHookCount=0; _"z#I CT(  
  hHook=NULL; _Z9I')  
 } 8f#YUK sW=  
 return unhooked; EMJ}tvL0Tp  
} nEs l  
Vd|/]Zj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -BNW\ ]}  
{ ox)/*c<  
 BOOL bAdded=FALSE; V GM/ed5-  
 for(int index=0;index<MAX_KEY;index++){ !$Mv)c/_u  
  if(hCallWnd[index]==0){ R'&^)_  
   hCallWnd[index]=hWnd; ?ILNp`k  
   HotKey[index]=cKey; a'Aru^el  
   HotKeyMask[index]=cMask; ~>)cY{wE_  
   bAdded=TRUE; nj)M$'  
   KeyCount++; k98--kc5  
   break; +]UPY5:F  
  } A.y"R)G  
 } 7!Fu.Ps >  
 return bAdded; R-Uj\M>  
} US4X CJxB  
oSE'-8(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @p}H@#/u\  
{ 92eS*x2@  
 BOOL bRemoved=FALSE; *FOTq'%i  
 for(int index=0;index<MAX_KEY;index++){ YIjBKh  
  if(hCallWnd[index]==hWnd){ c9DX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6V!yfps)  
    hCallWnd[index]=NULL; E&]S No<  
    HotKey[index]=0; :90DS_4  
    HotKeyMask[index]=0; >uxak2nM-  
    bRemoved=TRUE; vzy/Rq  
    KeyCount--; IHf A;&b  
    break; -3ha LdRk6  
   } 0]NjsOU =  
  } EYMwg_  
 } A qE,zW  
 return bRemoved; +U@P+;  
} J6\<>5 A?  
(9'MdH  
void VerifyWindow() 2<YHo{0BLS  
{ lD\lFN(:  
 for(int i=0;i<MAX_KEY;i++){ #& R x(  
  if(hCallWnd!=NULL){ rHN>fySn7  
   if(!IsWindow(hCallWnd)){ l,pq;>c9a  
    hCallWnd=NULL; u V=rLDY  
    HotKey=0; 8={(Vf6  
    HotKeyMask=0; <K|_M)/9  
    KeyCount--; | u36-  
   } mrk Q20D  
  } nL@P {,J  
 } hg=\L5R  
} _d)w, ;m#  
O^|,Cbon6  
BOOL CHookApp::InitInstance() C+O`3wPZp  
{ nn5S7!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); B.|2w  
 hins=AfxGetInstanceHandle(); #S_LKc  
 InitHotkey(); aRj3TtFh  
 return CWinApp::InitInstance(); r=8]Ub[  
} +qjW;]yxP  
nM\W a  
int CHookApp::ExitInstance() Q8T4_p [-o  
{ \-`L}$  
 VerifyWindow(); S ^2'O7uj  
 UnInit(); ]';!r20  
 return CWinApp::ExitInstance(); Xs*~ [k'  
} Mx0c # d.  
7ugmZO}lL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @^#y23R U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u.$.RkNMQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B% BO  
#if _MSC_VER > 1000 kRZ(  
#pragma once !X*L<)=nh  
#endif // _MSC_VER > 1000 rDm>Rm=  
cb|`)"<HN  
class CCaptureDlg : public CDialog K)@]vw/\  
{ H;Z{R@kf  
 // Construction CM8WI~  
 public: i8u9~F   
  BOOL bTray; G8 f7N; D  
  BOOL bRegistered; rTW1'@E  
  BOOL RegisterHotkey(); [ZDJs`h!`  
  UCHAR cKey; I3s'44  
  UCHAR cMask; Xgr|~(^  
  void DeleteIcon(); A]Q4fD1q  
  void AddIcon(); p;X[_h  
  UINT nCount; !W n'Ae9  
  void SaveBmp(); RSzp-sKB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CA[k$Sw*  
  // Dialog Data />.&  
  //{{AFX_DATA(CCaptureDlg) 7u o4F= %  
  enum { IDD = IDD_CAPTURE_DIALOG }; mpK|I|-   
  CComboBox m_Key; t[)z/[ m  
  BOOL m_bControl; x8tRa0-q  
  BOOL m_bAlt; )<IbQH|_  
  BOOL m_bShift; =:o)+NE  
  CString m_Path; uh`~K6&*\w  
  CString m_Number; T JLz^%t  
  //}}AFX_DATA ]-L/Of6F)|  
  // ClassWizard generated virtual function overrides B~yD4^  
  //{{AFX_VIRTUAL(CCaptureDlg) Qh?q 0VKU^  
 public: s13Iu#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $?ke "  
 protected: 6L'cD1pu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :8yrtbf$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K xh)'aal  
  //}}AFX_VIRTUAL ,&z_ 2m  
  // Implementation ,7 >_Lp_v  
 protected: _mA[^G=gY  
  HICON m_hIcon; K31Fp;K  
  // Generated message map functions -V_e=Y<J/  
  //{{AFX_MSG(CCaptureDlg) >L[,.}(9  
  virtual BOOL OnInitDialog(); QF!K$?EU[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *l_1T4]S  
  afx_msg void OnPaint();  2Np9*[C  
  afx_msg HCURSOR OnQueryDragIcon(); 0z.`  
  virtual void OnCancel(); x/bO;9E%U4  
  afx_msg void OnAbout(); AUzJ:([V  
  afx_msg void OnBrowse(); 2!{CNt.-  
  afx_msg void OnChange(); [@Uc4LX  
 //}}AFX_MSG {hZZU8*  
 DECLARE_MESSAGE_MAP() 2*%0m^#^6  
}; r{p?aG  
#endif - uliND  
h`&mW w  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]V><gZ  
#include "stdafx.h" oV,>u5:B  
#include "Capture.h" BU]9eF!>h  
#include "CaptureDlg.h" 'Kp|\T r  
#include <windowsx.h> )x?F1/  
#pragma comment(lib,"hook.lib") w4RP*Da?:  
#ifdef _DEBUG  QqtFNG  
#define new DEBUG_NEW Vk{0)W7  
#undef THIS_FILE %0fj~s;  
static char THIS_FILE[] = __FILE__; dKZffDTZ  
#endif [G t|Qp[   
#define IDM_SHELL WM_USER+1 eEezd[p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k<8:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w}oH]jVKL6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; k. px  
class CAboutDlg : public CDialog Z~muQ c?  
{ 7QQ1oPV  
 public: ~`8`kk8  
  CAboutDlg(); f<0-'fGJd  
  // Dialog Data CZ|Y o  
  //{{AFX_DATA(CAboutDlg) &eK8v]|"W  
  enum { IDD = IDD_ABOUTBOX }; @qg=lt|(F  
  //}}AFX_DATA ?Za1  b  
  // ClassWizard generated virtual function overrides yBs  
  //{{AFX_VIRTUAL(CAboutDlg) Kax85)9u  
 protected: b`18y cVME  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /$+ifiFT  
  //}}AFX_VIRTUAL :+!hR4Z~\;  
  // Implementation CO 5?UgA  
 protected: 'DRyOJnr  
  //{{AFX_MSG(CAboutDlg) O_KL#xo  
  //}}AFX_MSG _oe2 pL&  
  DECLARE_MESSAGE_MAP() mw?,oiT,)  
}; _g$6vx&  
{9_CH<$W%U  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]U'KYrh  
{ DQKhR sC  
 //{{AFX_DATA_INIT(CAboutDlg) LD]XN'?"W  
 //}}AFX_DATA_INIT gd/W8*NFR  
} l,,5OZw  
eX;"kO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t6s#19g  
{ Y7!,s-v4W  
 CDialog::DoDataExchange(pDX); a;([L8^7$l  
 //{{AFX_DATA_MAP(CAboutDlg) =(.HO:#  
 //}}AFX_DATA_MAP 2l8jw:=H  
} bWjW_$8  
,#D &*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YadyRUE  
 //{{AFX_MSG_MAP(CAboutDlg) {@B<$g   
 // No message handlers 3mr9}P9;  
 //}}AFX_MSG_MAP >(~; V;  
END_MESSAGE_MAP() '1/uf;OXIH  
NWb,$/7T  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8 :Z3Q  
: CDialog(CCaptureDlg::IDD, pParent) viY _Y.Yjy  
{ F9-xp7 T  
 //{{AFX_DATA_INIT(CCaptureDlg) 8Qek![3^  
  m_bControl = FALSE; f>l}y->-Ug  
  m_bAlt = FALSE; ,58D=EgFy  
  m_bShift = FALSE; 5 E DGl  
  m_Path = _T("c:\\"); b s:E`Q  
  m_Number = _T("0 picture captured."); "aAzG+NM  
  nCount=0; CbI[K|  
  bRegistered=FALSE; z1(rHJd  
  bTray=FALSE; M nH4p  
 //}}AFX_DATA_INIT g^4'42UX  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sq-[<ryk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F7cv`i?2."  
} / u>")f  
om;jXf}A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dJ:EXVU  
{ 9M<qk si  
 CDialog::DoDataExchange(pDX); ]NG`MZ  
 //{{AFX_DATA_MAP(CCaptureDlg) <E!M<!h  
  DDX_Control(pDX, IDC_KEY, m_Key); ? vk;b!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3QU<vdtr  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &*[T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  h ej  
  DDX_Text(pDX, IDC_PATH, m_Path); 1r|'n aiZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); A;q}SO%b  
 //}}AFX_DATA_MAP Z5_U D  
} DHgEhf]  
qZCA16  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZIkXy*<(  
//{{AFX_MSG_MAP(CCaptureDlg) j`='SzVloW  
 ON_WM_SYSCOMMAND() WPCaxA+l  
 ON_WM_PAINT() ~.yt  
 ON_WM_QUERYDRAGICON() 4^  $  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) lUUeM\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |4ONGU*`E  
 ON_BN_CLICKED(ID_CHANGE, OnChange) X0Xs"--}  
//}}AFX_MSG_MAP G\|VTqu  
END_MESSAGE_MAP() gtVI>D'(W  
g' H!%<  
BOOL CCaptureDlg::OnInitDialog() 8L6!CP_!  
{ /wH]OD{  
 CDialog::OnInitDialog(); iK= {pd  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3dQV5E.  
 ASSERT(IDM_ABOUTBOX < 0xF000); s?7g3H5#0k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); f9X*bEl9;`  
 if (pSysMenu != NULL) yA \C3r'  
 { a 0Hzf  
  CString strAboutMenu; pRc@0^G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _{C:aIl[2  
  if (!strAboutMenu.IsEmpty()) *:aJlvk  
  { aQ46euth  
   pSysMenu->AppendMenu(MF_SEPARATOR); Y(-4Agq  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y!Wz7 C  
  } Mw*R~OX  
 } /mo4Q?^  
 SetIcon(m_hIcon, TRUE); // Set big icon (9{)4[3MAG  
 SetIcon(m_hIcon, FALSE); // Set small icon &v'e;W  
 m_Key.SetCurSel(0); V)f/umT%g  
 RegisterHotkey(); d^!)',`  
 CMenu* pMenu=GetSystemMenu(FALSE); 89k9#i X  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); RU>T?2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); WENPS*0oS]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *'1qA0Xc  
 return TRUE; // return TRUE unless you set the focus to a control g75)&U`>}  
} T B1E1  
Gt2NUGU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Qf6Vj,~N  
{ gle_~es'K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) aS-rRL|\L  
 { gH(,>}{^K  
  CAboutDlg dlgAbout; K8ecSs}}J  
  dlgAbout.DoModal(); b'3w.%^  
 } #\GWYWkR  
 else E#Smi507p  
 { "z1\I\ ^  
  CDialog::OnSysCommand(nID, lParam); GxuFO5wz  
 } sFT-aLpL@V  
} Z455g/=ye  
$NWXn,Y'  
void CCaptureDlg::OnPaint() N3!x7J7A  
{ 7D@O:yO  
 if (IsIconic()) >Ke4lO"  
 { ^uD r  
  CPaintDC dc(this); // device context for painting /608P:U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); nNSq6 Cj  
  // Center icon in client rectangle soRt<83  
  int cxIcon = GetSystemMetrics(SM_CXICON); _%?}e|epy  
  int cyIcon = GetSystemMetrics(SM_CYICON); yCwBZ/C  
  CRect rect; Nv{r`J.  
  GetClientRect(&rect); UpF,e>s  
  int x = (rect.Width() - cxIcon + 1) / 2; XkDjA#nx`  
  int y = (rect.Height() - cyIcon + 1) / 2; PxhB=i!'$  
  // Draw the icon kXFgvIpg<  
  dc.DrawIcon(x, y, m_hIcon); 1 `hj]@.]  
 } /EZF5_`bT  
 else MN}@EQvW==  
 { &}_E~jKK  
  CDialog::OnPaint(); 4onRO!G,  
 } w4\b^iJz  
} f R$E*Jd  
/. k4Y  
HCURSOR CCaptureDlg::OnQueryDragIcon() d3v5^5kU  
{ \tc 4DS  
 return (HCURSOR) m_hIcon; C (L1  
} F.<sKQ&A  
Y6~/H  
void CCaptureDlg::OnCancel() D1}Bn2BM$  
{ f"\G"2C  
 if(bTray) (j@3=-%6G  
  DeleteIcon(); 0 XxU1w8\V  
  CDialog::OnCancel(); s"7wG!yf  
} w] i&N1i  
3xj ?}o  
void CCaptureDlg::OnAbout() h:\WW;s[B  
{ }1 = V`N(  
 CAboutDlg dlg; oJE~dY$Q  
 dlg.DoModal(); ~Gx"gK0  
} A>8"8=C  
vq-Tq>  
void CCaptureDlg::OnBrowse() ]:uJ&xUar  
{ `md)|PSU  
 CString str; r-&Rjg  
 BROWSEINFO bi; DgQw`D)+  
 char name[MAX_PATH]; H`odQkZ!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %C^U?m`  
 bi.hwndOwner=GetSafeHwnd(); :Q@=;P2  
 bi.pszDisplayName=name; ZCsL%(  
 bi.lpszTitle="Select folder"; FH:^<^M  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; UIPi<_Xa  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9#Gz2u$  
 if(idl==NULL) mxt fKPb  
  return; Y3KKskhLx  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .aTu]i3l_  
 str.ReleaseBuffer(); E&ou(Q={  
 m_Path=str; @0H}U$l  
 if(str.GetAt(str.GetLength()-1)!='\\') 1AiqB Rs  
  m_Path+="\\"; 8@pY:AY  
 UpdateData(FALSE); 3 (Bd`=9  
} =|_:H$94  
-T3 z@k  
void CCaptureDlg::SaveBmp() =aR'S\<  
{ BV_rk^}Ur  
 CDC dc; ~5g2~.&*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ' P5t tI#|  
 CBitmap bm; zg L0v5vk  
 int Width=GetSystemMetrics(SM_CXSCREEN); {=};<;_F  
 int Height=GetSystemMetrics(SM_CYSCREEN); Qk2^p^ T6  
 bm.CreateCompatibleBitmap(&dc,Width,Height); +ExXhT  
 CDC tdc; *M6' GT1%c  
 tdc.CreateCompatibleDC(&dc); X!#rw= Q  
 CBitmap*pOld=tdc.SelectObject(&bm); v0W w~4|],  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g$$i WC!S<  
 tdc.SelectObject(pOld); M#ED49Dh>  
 BITMAP btm; D_mdX9-~  
 bm.GetBitmap(&btm); <\40?*2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pD;'uEFBQ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X <QSi   
 BITMAPINFOHEADER bih; |&!04~s;E  
 bih.biBitCount=btm.bmBitsPixel; 3<">1] /,  
 bih.biClrImportant=0; bWU4lPfP  
 bih.biClrUsed=0; 7:iTx;,v  
 bih.biCompression=0; lAYyxG#  
 bih.biHeight=btm.bmHeight; EMK>7 aks  
 bih.biPlanes=1; v w(X9xa  
 bih.biSize=sizeof(BITMAPINFOHEADER); wyG7SA   
 bih.biSizeImage=size; Nmu;+{19M  
 bih.biWidth=btm.bmWidth; Fb8~2N"3  
 bih.biXPelsPerMeter=0; y*ux7KO  
 bih.biYPelsPerMeter=0; Am>^{qh9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -36pkC 6 \  
 static int filecount=0; Q[sj/  
 CString name; :g@H=W  
 name.Format("pict%04d.bmp",filecount++); Y'n+,g  
 name=m_Path+name; %2)B.qTp&  
 BITMAPFILEHEADER bfh; )g;*u,C  
 bfh.bfReserved1=bfh.bfReserved2=0; +b O]9* g]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S: b-+w|*  
 bfh.bfSize=54+size; z''ITX)oG  
 bfh.bfOffBits=54; :<Z>?x  
 CFile bf; :`U@b 6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,e]|[,r#5  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uKOsYN%D  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \Z~|ry0v{d  
  bf.WriteHuge(lpData,size); xhq-$"B  
  bf.Close(); 5SOl:{A +  
  nCount++; 1^R[kaY  
 } v2ab  
 GlobalFreePtr(lpData); QY)hMo=|o8  
 if(nCount==1) R#8.]  
  m_Number.Format("%d picture captured.",nCount); Z@i"/~B|4\  
 else pGO=3=O  
  m_Number.Format("%d pictures captured.",nCount); ]|6)'L&]*s  
  UpdateData(FALSE); yv),>4_6  
} M9*#8>  
q-tm `t*7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ng=_#<  
{ xMOq/" )  
 if(pMsg -> message == WM_KEYDOWN) #Cy9E"lP  
 { j*XhBWE?  
  if(pMsg -> wParam == VK_ESCAPE) aFfd!a" n  
   return TRUE; coG_bX?e  
  if(pMsg -> wParam == VK_RETURN) a%FM)/oI|T  
   return TRUE; 0-VC$)S  
 } Y:;]qoF  
 return CDialog::PreTranslateMessage(pMsg); ]?1n-w.}r  
} L+GVB[@3Y  
V$OZC;4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) cUB+fH<B2  
{ >^odV ;^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =uG}pgh0  
  SaveBmp(); 0 UbY0sYo  
  return FALSE; p]lZ4#3  
} o$Jop"To  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;kE|Vx  
 CMenu pop; Of@ LEEh6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cM|!jnKm  
 CMenu*pMenu=pop.GetSubMenu(0); Tl/!Dn  
 pMenu->SetDefaultItem(ID_EXITICON); ()\=(n!J  
 CPoint pt; I=;.o>  
 GetCursorPos(&pt); 8gI f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &xgKHbg  
 if(id==ID_EXITICON) r9\7I7z  
  DeleteIcon(); _`Lv@T.  
 else if(id==ID_EXIT) *PF}L%K(?  
  OnCancel(); Qo%IZw$l  
 return FALSE; /[<1D|f%  
} F4R0A6HL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k1h>8z.Tg  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @)^|U"  
 AddIcon(); X`s6lV%\  
 return res; <F%c"Rkh  
} t5M"M{V  
s+fjQo4  
void CCaptureDlg::AddIcon() $URL7hrhU  
{ LA9'HC(5  
 NOTIFYICONDATA data; Ow3t2G  
 data.cbSize=sizeof(NOTIFYICONDATA); O_S%PX  
 CString tip; |qAU\m"Pc  
 tip.LoadString(IDS_ICONTIP); 1 x'H #  
 data.hIcon=GetIcon(0); ;Yr?"|  
 data.hWnd=GetSafeHwnd(); 1*VArr6*6  
 strcpy(data.szTip,tip); 2d60o~ E  
 data.uCallbackMessage=IDM_SHELL; e$t$,3~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gXb * zt2  
 data.uID=98; FdcmA22k*  
 Shell_NotifyIcon(NIM_ADD,&data); [ 11D7L%1t  
 ShowWindow(SW_HIDE); ,qz:(Nr  
 bTray=TRUE; =1SG^rp  
} L\%zNPLS  
wRj||yay#-  
void CCaptureDlg::DeleteIcon() N"zg)MsX  
{ EvJ<X,Bo  
 NOTIFYICONDATA data; 0e,U&B<W  
 data.cbSize=sizeof(NOTIFYICONDATA); Acl?w }Y  
 data.hWnd=GetSafeHwnd(); r:~q{  
 data.uID=98; +U^H`\EUr  
 Shell_NotifyIcon(NIM_DELETE,&data); V/dL-;W;  
 ShowWindow(SW_SHOW); ^VOA69n>$  
 SetForegroundWindow(); -TT{4\%s  
 ShowWindow(SW_SHOWNORMAL); 1Z_2s2`p  
 bTray=FALSE; &W*do  
} %p}xW V.  
|!?lwBs4  
void CCaptureDlg::OnChange() /h v2=A  
{ .[Nr2w:>  
 RegisterHotkey(); k>V~ iA  
} .Z9{\tj  
0Z&ua  
BOOL CCaptureDlg::RegisterHotkey() .Y*jL&!  
{ 2E$K='H:,  
 UpdateData(); v1aE[Q  
 UCHAR mask=0; 9cJ1J7y  
 UCHAR key=0; t wr-+rm2  
 if(m_bControl) 6$5?%ZLJ  
  mask|=4; 'u84d=*l  
 if(m_bAlt) >V$ S\"  
  mask|=2; o ?`LZd:{  
 if(m_bShift) j FH wu*  
  mask|=1; % s),4  
  key=Key_Table[m_Key.GetCurSel()]; Id<O/C  
 if(bRegistered){ k"pN  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3jzmiS]  
  bRegistered=FALSE; C lWxL#L6~  
 } gnWEsA\!  
 cMask=mask; g><i tA?  
 cKey=key; xhw0YDGzf  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3cSP1=$*  
 return bRegistered; *Me&> "N"  
} Lyy:G9OV  
Nq >"vEq)  
  四、小结 zk^uS#  
j G^f_w  
  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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