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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: )K &(  
  y;/VB,4V  
  一、实现方法  : ]C~gc  
(#+^&1  
  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-XWK=  
(5]}5W*  
#pragma data_seg("shareddata") I? ,>DHUX  
HHOOK hHook =NULL; //钩子句柄 "DYJ21Ut4  
UINT nHookCount =0; //挂接的程序数目 ;!(<s,c#:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &b:1I 7Cp*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 oJN#C%r7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey {<<U^<6}  
static int KeyCount =0; #%DE;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 *}P~P$q%  
#pragma data_seg() H%D$(W  
|\pbir  
  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。 dAuJXGo  
om1eQp0N  
  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: (+0v<uR^D  
KCs[/]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR h $2</J"  
cKey,UCHAR cMask) yqPdl1{Qr=  
{ ZHa"isl$e  
 BOOL bAdded=FALSE; \-g)T}g,I  
 for(int index=0;index<MAX_KEY;index++){ <7~'; K  
  if(hCallWnd[index]==0){ Zu7)gf  
   hCallWnd[index]=hWnd; kGl~GOB a  
   HotKey[index]=cKey; .[_L=_.  
   HotKeyMask[index]=cMask; Hj}K{20  
   bAdded=TRUE; 5 sX+~Q  
   KeyCount++; X(NLtO w  
   break; 6Yln, rC  
  } ?` ?)QE8  
 } nR*ryv  
 return bAdded; m;,N)<~  
} mHRiugb!  
//删除热键 PpzP7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'tH_p  
{ s%W C/ZK  
 BOOL bRemoved=FALSE; ,y#Kv|R  
 for(int index=0;index<MAX_KEY;index++){ ;=MU';o  
  if(hCallWnd[index]==hWnd){ K|epPGRr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {z{bY\  
    hCallWnd[index]=NULL; yK=cZw%D  
    HotKey[index]=0; .6Pw|xu`Pw  
    HotKeyMask[index]=0; 5?x>9C a  
    bRemoved=TRUE; wfH^<jY)E  
    KeyCount--; I`!<9OTBj  
    break; 6^`1\ #f  
   } F'21jy&  
  } BI%$c~wS  
 } <J`0  
 return bRemoved; %#kg#@z_`e  
} $| @ (  
%V7at7>o  
n"c[,k+R`U  
  DLL中的钩子函数如下: EFM5,gB.m  
Iy&!<r7:]0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) , K~}\CR  
{ ZQV6xoN;r  
 BOOL bProcessed=FALSE; Jcd-  
 if(HC_ACTION==nCode) J| w>a  
 { VZKvaxIk6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 gi1^3R[  
   switch(wParam) .[ICx  
   {  1G^`-ri6  
    case VK_MENU: Hquc o  
     MaskBits&=~ALTBIT; `r9!zffyS  
     break; m+]K;}.}R  
    case VK_CONTROL: X aMJDa|M  
     MaskBits&=~CTRLBIT; e w$ B)W  
     break; , s"^kFl  
    case VK_SHIFT: N2;B-UF 7  
     MaskBits&=~SHIFTBIT; \"P%`  C  
     break; V2wb%;q  
    default: //judge the key and send message sBT2j~jhJ  
     break; [M=7M}f;  
   } ig/xv  
   for(int index=0;index<MAX_KEY;index++){ cK(C&NK  
    if(hCallWnd[index]==NULL) GjvOM y  
     continue; VA#"r!1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I&x=;   
    { 9y"@(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i9,ge Q7d  
     bProcessed=TRUE; p8Qk 'F=h  
    } fHx*e'eA  
   } vdc\R?  
  } ek*rp`y]  
  else if((lParam&0xc000ffff)==1){ //有键按下 %]}  
   switch(wParam) |ATvS2  
   { -cAo@}v  
    case VK_MENU: _@ qjV~%Sy  
     MaskBits|=ALTBIT; 286jI7T  
     break; ,l\- xSM  
    case VK_CONTROL: L>Fa^jq5  
     MaskBits|=CTRLBIT; w;4<h8Wn5  
     break; 4V)kx[j  
    case VK_SHIFT: #lL^?|M  
     MaskBits|=SHIFTBIT; .SU8)T  
     break; ,is3&9  
    default: //judge the key and send message rZ}:Z'`  
     break; X^wt3<Kbf  
   } 2} /aFR  
   for(int index=0;index<MAX_KEY;index++){ a%JuC2  
    if(hCallWnd[index]==NULL) f<d`B]$(  
     continue; / *#r`A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) - M4J JV(  
    { dO! kk"qn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T $>&[f$6  
     bProcessed=TRUE; ?]_$Dcmx  
    } bN1|q| 9  
   } f@wquG'  
  } KQ!8ks]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <KL,G};0pm  
   for(int index=0;index<MAX_KEY;index++){ BYL)nCc  
    if(hCallWnd[index]==NULL) spH7 /5}  
     continue; U ]H#MiC!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ) j#`r/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PUMXOTu]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2lH&  
   } 3Ei#q+7  
  } BLQ6A<  
 } {HltvO%8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $w`x vX  
} pP&7rRhw  
Qb-M6ihcc  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ;"5&b!=t  
l *(8i ^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M2,l7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -A^_{4X  
%S960  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: t&C1Oo}=3  
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ] vHF~|/-  
{ > PRFWO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;#W2|'HD  
 { p_gm3Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AUG#_HE]k  
  SaveBmp(); c<:-T  
  return FALSE; t6 "%3#s  
 } X:"i4i[}{9  
 …… //其它处理及默认处理 Cn34b_Sbd  
} |.: q  
)0]'QLH  
M6 "PX *K  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 S%;O+eFYb  
i &nSh ]KK  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 iy.p n  
@alK;\  
  二、编程步骤 zZPO&akB"  
_}Ac n$  
  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"; =7=]{Cx[  
o q Xg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5uGq%(24  
nfbR P t  
  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; GY'%+\*tj  
#jvtUS\  
  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; hR?{3d#x2  
Mq156TL  
  5、 添加代码,编译运行程序。 hn G Z=  
z#wkiCRYm  
三、程序代码 AlaW=leTe  
Cv.C;H  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL lfow1WRF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *w`sM%]Rq  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z"xvh81P  
#if _MSC_VER > 1000 2*& ^v  
#pragma once q 'yva  
#endif // _MSC_VER > 1000 A:%`wX}  
#ifndef __AFXWIN_H__ -l*|M(N\  
#error include 'stdafx.h' before including this file for PCH &jJL"gq"  
#endif 6P l<'3&  
#include "resource.h" // main symbols y'q$ |  
class CHookApp : public CWinApp AO4U}?  
{ ,?%Zc$\LW  
 public: b4 6~?*  
  CHookApp(); `Y$4 H,8L  
  // Overrides *~e?TfG  
  // ClassWizard generated virtual function overrides kS);xA8s]  
  //{{AFX_VIRTUAL(CHookApp) D;*SnU(9L  
 public: iOghb*aW  
  virtual BOOL InitInstance(); Dcgo%F-W  
  virtual int ExitInstance(); d7;um<%zn  
  //}}AFX_VIRTUAL Se}c[|8  
  //{{AFX_MSG(CHookApp) zY{A'<\O  
  // NOTE - the ClassWizard will add and remove member functions here. jvL[ JI,b  
  // DO NOT EDIT what you see in these blocks of generated code ! Ynj,pl  
  //}}AFX_MSG =&]g "a'  
  DECLARE_MESSAGE_MAP() rglXs  
}; gPI ?C76  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); K($Npuu]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (y~TL*B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mO7]9 p  
BOOL InitHotkey(); +~$ ]} %  
BOOL UnInit(); EW OVx*l  
#endif sY&IquK^  
j</: WRA`]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Wqw1J=]  
#include "stdafx.h" *i%.;Z"  
#include "hook.h" %5n_ p^xp  
#include <windowsx.h> Xl#ggub?  
#ifdef _DEBUG E{`fF8]K  
#define new DEBUG_NEW 45c$nuZ  
#undef THIS_FILE *] ) `z8Ox  
static char THIS_FILE[] = __FILE__; ]h+j)J}[A  
#endif qR8Lh( "i  
#define MAX_KEY 100 FcU SE  
#define CTRLBIT 0x04 R__OP`!  
#define ALTBIT 0x02 hL{KRRf>  
#define SHIFTBIT 0x01 tS=(}2Q  
#pragma data_seg("shareddata") ;*Et[}3  
HHOOK hHook =NULL; "<1{9  
UINT nHookCount =0; /(*q}R3Kfo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !l8PDjAE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;N0XFjdR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Wd:uV  
static int KeyCount =0; 0S!K{xyR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift k?^z;Tlvw  
#pragma data_seg() $%#!bV  
HINSTANCE hins; (uE!+2C  
void VerifyWindow(); ]2KihP8z x  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S4z;7z(8+  
//{{AFX_MSG_MAP(CHookApp) Why`ziks  
// NOTE - the ClassWizard will add and remove mapping macros here. YU'E@t5  
// DO NOT EDIT what you see in these blocks of generated code! sUQ@7sTj  
//}}AFX_MSG_MAP ?0SJfh  
END_MESSAGE_MAP() hHnYtq  
}19\.z&J  
CHookApp::CHookApp() \_f(M|  
{ n{mfn *r.  
 // TODO: add construction code here, U 'bEL^Jf  
 // Place all significant initialization in InitInstance ?Z/V~,  
} mCVFS=8V  
2E'UZ m  
CHookApp theApp; !%c\N8<>GD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )jP1or  
{ Yc?*dUV  
 BOOL bProcessed=FALSE; BRiE&GzrF  
 if(HC_ACTION==nCode) '~=SzO  
 { .aQ \jA  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1mG-}  
   switch(wParam) 2P0*NQ   
   { s;Q!X ?Q  
    case VK_MENU: @\#td5'  
     MaskBits&=~ALTBIT; tG a8W  
     break; r;N|)  
    case VK_CONTROL: u'BaKWPS  
     MaskBits&=~CTRLBIT; (*iHf"=\  
     break; 1=V-V<  
    case VK_SHIFT: 3a'<*v<xw  
     MaskBits&=~SHIFTBIT; MQ6KN(?\ZL  
     break; MQ8J<A Pf-  
    default: //judge the key and send message $ddCTS^  
     break; $xN|5;+  
   } 0 kW,I  
   for(int index=0;index<MAX_KEY;index++){ &D*b|ilvc  
    if(hCallWnd[index]==NULL) C~/a-  
     continue; J)-x!y>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }BP;1y6-r  
    { KbeC"mi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Qvhl4-XjZa  
     bProcessed=TRUE; H/M@t\$Dc  
    } 3.y vvPFEM  
   } PdWx|y{%  
  } 5=ryDrx  
  else if((lParam&0xc000ffff)==1){ //Key down >4CbwwMA  
   switch(wParam) _oeS Uzq.  
   { gg2( 5FPP  
    case VK_MENU: w\O;!1iU  
     MaskBits|=ALTBIT; 4o[{>gW  
     break; sfl<qD+?  
    case VK_CONTROL: \'O"~W  
     MaskBits|=CTRLBIT; N;`n@9BF  
     break; Z7Hbj!d/Sz  
    case VK_SHIFT: =T7.~W  
     MaskBits|=SHIFTBIT; 0o&5 ]lEe  
     break; oEpFuWp%A  
    default: //judge the key and send message VI *$em O0  
     break; >XfbP]  
   } }O p; g^W  
   for(int index=0;index<MAX_KEY;index++) u>vL/nI  
   { X^jfuA  
    if(hCallWnd[index]==NULL) Xsa].  
     continue; 3!_XEN[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CU!Dhm/U  
    { 5Gm_\kd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #Gi$DMW  
     bProcessed=TRUE; pMM8-R'W-  
    } ]7A'7p $Y  
   } 493*{  
  } 7b+6%fV  
  if(!bProcessed){ ?}Y]|c^W  
   for(int index=0;index<MAX_KEY;index++){ YN5rml'-  
    if(hCallWnd[index]==NULL) pd$[8Rmj_  
     continue; a d\ot#V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4_ML],.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6_B]MN!(  
   } ,PD QzJY  
  } MF'JeM;H  
 } 6ik$B   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '~ 47)fN  
} .T`%tJ-Em  
<1TAw.  
BOOL InitHotkey() <F'\lA9  
{ J<lW<:!3]  
 if(hHook!=NULL){ g<qaXv  
  nHookCount++; uPvEwq* C  
  return TRUE; {oL>1h,%3?  
 } xoME9u0x4  
 else ~"A0Rs=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); UPGtj"2v-  
  if(hHook!=NULL) s5. CFA  
   nHookCount++; {n=|Db~S  
  return (hHook!=NULL); :k#HW6p  
} #<xm.  
BOOL UnInit() 6aj!Q*(WT  
{ \{NO?%s0p  
 if(nHookCount>1){ `WS&rmq&'  
  nHookCount--; DHRlWQox  
  return TRUE; C,eu9wOT  
 } nJ;.Td  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .6J$,.Ig  
 if(unhooked==TRUE){ _Z\G5x  
  nHookCount=0; F"mmLao  
  hHook=NULL; %"-5 <6d  
 } %z$#6?OK^  
 return unhooked; !()Qm,1u  
} ;9#KeA _  
J .<F"r>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w32y3~  
{ E?@m?@*/  
 BOOL bAdded=FALSE; CvdN"k  
 for(int index=0;index<MAX_KEY;index++){ -:rUw$3J  
  if(hCallWnd[index]==0){ wuo,kM  
   hCallWnd[index]=hWnd; 8 FhdN  
   HotKey[index]=cKey; iURe([@  
   HotKeyMask[index]=cMask; B-mowmJ3dg  
   bAdded=TRUE; )U# K  
   KeyCount++; ugBCBr  
   break; % AgUUn&k  
  } 'N(R_q6MW  
 } G+m }MOQP7  
 return bAdded; MqMQtU9w  
} z(~_AN M4,  
E*lxVua  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) moE2G?R  
{ [N'h%1]\  
 BOOL bRemoved=FALSE; .]K%G\*`:  
 for(int index=0;index<MAX_KEY;index++){ Vt ohL+  
  if(hCallWnd[index]==hWnd){ h@BY]80  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uw8f ~:LT  
    hCallWnd[index]=NULL; y)<q /  
    HotKey[index]=0; 2A!FDr~cdT  
    HotKeyMask[index]=0; ]_$[8#kg  
    bRemoved=TRUE; w2'5#`m  
    KeyCount--; 4&iCht =  
    break; qJw_  
   } y_[vr:s5pG  
  } 7-A2_!_x{  
 } E(|>Ddv B&  
 return bRemoved; i-&yH  
} t`QENXA}  
Bbp|!+KP{(  
void VerifyWindow() ##ANrG l  
{ i@'dH3-kO  
 for(int i=0;i<MAX_KEY;i++){ P93@;{c(  
  if(hCallWnd!=NULL){ 6H|S;K+  
   if(!IsWindow(hCallWnd)){ {xB3S_,8  
    hCallWnd=NULL; jj>]9z  
    HotKey=0; Ir]\|t  
    HotKeyMask=0; zW nR6*\  
    KeyCount--; ?h2}#wg  
   } `y0FY&y=  
  } zBH2@d3W  
 } WEpoBP CL  
} V43H /hl  
)`}:8y?  
BOOL CHookApp::InitInstance() y+;|Fz  
{ R}ecc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !!y a  
 hins=AfxGetInstanceHandle(); E\$W_Lmr  
 InitHotkey(); i mM_H;-X  
 return CWinApp::InitInstance(); 0CvUc>Pj`"  
} -{A<.a3P}=  
u=yOu^={  
int CHookApp::ExitInstance() |cY`x(?yP  
{ GKCroyor  
 VerifyWindow(); 9!tW.pK5  
 UnInit(); \j.:3X r  
 return CWinApp::ExitInstance(); FPTK`Gd0  
} h7@6T+#WoT  
g `4<9RMun  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file mV m Gg,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "w _aM7x_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i?;Kq~,  
#if _MSC_VER > 1000 'f|o{  
#pragma once L rPkxmR  
#endif // _MSC_VER > 1000 y?!"6t7&  
ET >](l9  
class CCaptureDlg : public CDialog uIrG*K  
{ CQ2jP G*py  
 // Construction },[}$m %  
 public: YoE3<[KD(  
  BOOL bTray; O9p|a%o  
  BOOL bRegistered; uVU)d1N  
  BOOL RegisterHotkey(); zn(PI3+]!  
  UCHAR cKey; Ct|A:/z(  
  UCHAR cMask; _aMF?Pj~m  
  void DeleteIcon(); GJUL$9  
  void AddIcon(); y!%CffF2  
  UINT nCount; ?hM64jI|  
  void SaveBmp(); /Q )\+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor j~QwV='S  
  // Dialog Data Qei" '~1a  
  //{{AFX_DATA(CCaptureDlg) { "E\Jcjl\  
  enum { IDD = IDD_CAPTURE_DIALOG }; R GX=)  
  CComboBox m_Key; c"xK`%e  
  BOOL m_bControl; UZ$/Ni  
  BOOL m_bAlt; E!AE4B1bd  
  BOOL m_bShift; c:g'.'/*  
  CString m_Path; 8i,K~Bu=  
  CString m_Number; 07$o;W@  
  //}}AFX_DATA '3H_wd  
  // ClassWizard generated virtual function overrides [8*)8jP3  
  //{{AFX_VIRTUAL(CCaptureDlg) Xx(T">]vJ  
 public: 3BLqCZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M@ZI\  
 protected: KG5>]_GH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]s748+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v.ui!|c  
  //}}AFX_VIRTUAL bu"!jHPB  
  // Implementation :j`s r  
 protected: ~v"L!=~G;a  
  HICON m_hIcon; m4yL@d,Yw  
  // Generated message map functions '%`:+]!  
  //{{AFX_MSG(CCaptureDlg) 6`-jPR  
  virtual BOOL OnInitDialog(); JMM W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [fIg{Q  
  afx_msg void OnPaint(); 3[f): u3"  
  afx_msg HCURSOR OnQueryDragIcon(); ,v&(YOd  
  virtual void OnCancel(); 8JD,u  
  afx_msg void OnAbout(); <Ok3FE.K  
  afx_msg void OnBrowse(); o8vug$=Z  
  afx_msg void OnChange(); IqGdfL6[(  
 //}}AFX_MSG A+)`ZTuO  
 DECLARE_MESSAGE_MAP() 2Wb]4-  
}; F}q c0  
#endif Hq 188<  
T,tdL N-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j8`BdKg  
#include "stdafx.h" YrKWA  
#include "Capture.h" +2j AC r  
#include "CaptureDlg.h" BF<ikilR  
#include <windowsx.h> {qMIGwu  
#pragma comment(lib,"hook.lib") !? gKqx'T$  
#ifdef _DEBUG 2 Vrw  
#define new DEBUG_NEW 1'\/,Es  
#undef THIS_FILE IaXeRq?<  
static char THIS_FILE[] = __FILE__; .6'qoo_N  
#endif alvrh'51  
#define IDM_SHELL WM_USER+1 6K<K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O0y_Lm\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m9Hit8f@Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #1G:lhkC  
class CAboutDlg : public CDialog ?3xzd P  
{ jalg5`PU0  
 public: @|%2f@h  
  CAboutDlg(); #lW`{i  
  // Dialog Data I 2|Bg,e  
  //{{AFX_DATA(CAboutDlg) &JI8]JmU)  
  enum { IDD = IDD_ABOUTBOX }; r$~HfskeI  
  //}}AFX_DATA 6i~WcAs  
  // ClassWizard generated virtual function overrides e)O 4^#i  
  //{{AFX_VIRTUAL(CAboutDlg) |H+Wed|  
 protected: k)Qtfj}uij  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 680o)hh4m>  
  //}}AFX_VIRTUAL :Z z '1C  
  // Implementation \K!VNB>h  
 protected: xK\d4 "  
  //{{AFX_MSG(CAboutDlg) \;"=QmRD%:  
  //}}AFX_MSG f`=-US  
  DECLARE_MESSAGE_MAP() \} :PLCKT  
}; }!C)}.L<  
,nB5/Lx  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #ucBo<[  
{ H DFOA  
 //{{AFX_DATA_INIT(CAboutDlg) H+Sz=tg5  
 //}}AFX_DATA_INIT 7x4PaX(  
} qm o9G  
eHDN\QA 2  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) KMjhZap%  
{ R!N%o~C2-  
 CDialog::DoDataExchange(pDX); \)?HJ  
 //{{AFX_DATA_MAP(CAboutDlg) l2P=R)@{  
 //}}AFX_DATA_MAP W1=H8 O  
} p"ZG%Ow5Q]  
P(z++A&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :A'y+MnK<  
 //{{AFX_MSG_MAP(CAboutDlg) ';=O 0)u  
 // No message handlers '(L7;+E  
 //}}AFX_MSG_MAP e;}7G  
END_MESSAGE_MAP() q(2'\ _`u  
nK%LRcAs  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R[x_j  
: CDialog(CCaptureDlg::IDD, pParent) 4Ic*9t3  
{ ~1vDV>dpE  
 //{{AFX_DATA_INIT(CCaptureDlg) [^98fAlz6  
  m_bControl = FALSE; 7Da`   
  m_bAlt = FALSE; }2<7%FL  
  m_bShift = FALSE; k{SAvKx=  
  m_Path = _T("c:\\"); d,n 'n  
  m_Number = _T("0 picture captured."); &@Be2!%'9K  
  nCount=0; Y\?"WGL)p  
  bRegistered=FALSE; FE|JHh$  
  bTray=FALSE; @wNG{Stj  
 //}}AFX_DATA_INIT 6MMOf\   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 OA"q[s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JB[~;nLlC  
} )C]g ld;8  
W+ko q*P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y^EcQzLw  
{ i5Yb`Z[Y  
 CDialog::DoDataExchange(pDX); l#Y,R 0  
 //{{AFX_DATA_MAP(CCaptureDlg) X LOh7(  
  DDX_Control(pDX, IDC_KEY, m_Key); D2B%0sfl~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); k5.Lna  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'op|B@y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;P%1j|7  
  DDX_Text(pDX, IDC_PATH, m_Path); [;) ,\\u,d  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~<F8ug #  
 //}}AFX_DATA_MAP 9H`XeQ.  
} |_aa&v~  
GH:jH]u!V  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]R f[y  
//{{AFX_MSG_MAP(CCaptureDlg) zL`iK"N`  
 ON_WM_SYSCOMMAND() MC.) 2B7  
 ON_WM_PAINT() ofw3S |F6  
 ON_WM_QUERYDRAGICON() qm8B8&-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Cl8Cg~2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fN^8{w/O  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \B,@`dw  
//}}AFX_MSG_MAP iE^84l68  
END_MESSAGE_MAP() G.a bql  
]tRu2Ygf  
BOOL CCaptureDlg::OnInitDialog() dufu|BL|}  
{ Ata:^qI  
 CDialog::OnInitDialog(); UJ7*j%XQz_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Y;^l%ePuW  
 ASSERT(IDM_ABOUTBOX < 0xF000); d K3*;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %^GfS@t  
 if (pSysMenu != NULL) ARwD~ Tr  
 { HjD8u`qQ  
  CString strAboutMenu; hxd`OG<gF  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Eq9x2  
  if (!strAboutMenu.IsEmpty()) :Cs4NF   
  { f=gW]x7'R+  
   pSysMenu->AppendMenu(MF_SEPARATOR); .p]RKS=(:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k(7&N0V%zz  
  } iYm-tsER;  
 } ']z{{UNUN  
 SetIcon(m_hIcon, TRUE); // Set big icon x vl#w  
 SetIcon(m_hIcon, FALSE); // Set small icon x '>9d  
 m_Key.SetCurSel(0); 4`]^@"{  
 RegisterHotkey(); ,|H `e^  
 CMenu* pMenu=GetSystemMenu(FALSE); }1i`6`y1  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); gANuBWh8T  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Rmt~,cW!\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ][h%UrV  
 return TRUE; // return TRUE unless you set the focus to a control ?2{Gn-{  
} &LZn FR  
{xB!EQ"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s.N/2F& *W  
{ Pz|>"'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tla 5B_  
 { (G4at2YLd  
  CAboutDlg dlgAbout; {e9@-  
  dlgAbout.DoModal(); ~{B7 k:  
 } K;Uvb(m{&  
 else |5~#&v_  
 { j9 4=hJVKi  
  CDialog::OnSysCommand(nID, lParam); ;jvBF4Lb>  
 } l2rd9 -T  
} #;q dY[v  
lN?qp'%H`  
void CCaptureDlg::OnPaint() lC("y' ::  
{ #+HJA42  
 if (IsIconic()) xU>WEm2  
 { RD'Q :W  
  CPaintDC dc(this); // device context for painting #crQ1p) \  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5Y'qaIFR  
  // Center icon in client rectangle  ~f1%8z  
  int cxIcon = GetSystemMetrics(SM_CXICON); lVR~Bh  
  int cyIcon = GetSystemMetrics(SM_CYICON); _j/<{vSy  
  CRect rect; #TX/aKr:  
  GetClientRect(&rect); Cc' 37~6~P  
  int x = (rect.Width() - cxIcon + 1) / 2; +wvWwie  
  int y = (rect.Height() - cyIcon + 1) / 2; R_ ,UMt  
  // Draw the icon Ug t.&IA  
  dc.DrawIcon(x, y, m_hIcon); [OV"}<V  
 } ," Wr"  
 else aa?b`[Xa  
 { H*&f:mfq  
  CDialog::OnPaint(); }{qZ[/JwqN  
 } k,E{C{^M  
} )=Z>#iH1  
@6F#rz  
HCURSOR CCaptureDlg::OnQueryDragIcon() N~d?WD\^  
{ zH4D8@[7O  
 return (HCURSOR) m_hIcon; ?{|q5n  
} \y)rt )  
w\}ieI8J  
void CCaptureDlg::OnCancel() % X+:o]T  
{ RLynE V;]  
 if(bTray) ~u!|qM  
  DeleteIcon(); J^nBdofP  
  CDialog::OnCancel(); _8riUt  
} ]kG"ubHV?h  
V2?=4mb  
void CCaptureDlg::OnAbout() #ASz;$P  
{ o]` *M|  
 CAboutDlg dlg; 4(~L#}:r!  
 dlg.DoModal(); X_ cV%#  
} {M$1N5Eh  
3yY}04[9<  
void CCaptureDlg::OnBrowse() (G u zN  
{ /-ch`u md  
 CString str; /vde2.|  
 BROWSEINFO bi; w%VU/6~  
 char name[MAX_PATH]; tl4V7!U@^z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =J]]EoX/  
 bi.hwndOwner=GetSafeHwnd(); ,p@y] cr  
 bi.pszDisplayName=name; *,)Md[  
 bi.lpszTitle="Select folder"; :q7Wy&ow  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; k\YG^I  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); UcDS9f_87  
 if(idl==NULL) *_{j=sd  
  return; yAs> {6%-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *{@Nq=fE  
 str.ReleaseBuffer();  u\x}8pn  
 m_Path=str; P*Uwg&Qz)  
 if(str.GetAt(str.GetLength()-1)!='\\') OwUhdiG  
  m_Path+="\\"; GT!M[*[  
 UpdateData(FALSE); wj<6kG  
} /y#f3r+*2  
=Z3F1Cq?  
void CCaptureDlg::SaveBmp() f ue(UMF~  
{ 0r] t`{H  
 CDC dc; }6}l7x  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); E7 Ul;d  
 CBitmap bm; '&R2U_  
 int Width=GetSystemMetrics(SM_CXSCREEN); p8H'{f\G  
 int Height=GetSystemMetrics(SM_CYSCREEN); .fFCC`&T  
 bm.CreateCompatibleBitmap(&dc,Width,Height); A*R^n}sh  
 CDC tdc; ZW8vza  
 tdc.CreateCompatibleDC(&dc); y8Z_Itlf  
 CBitmap*pOld=tdc.SelectObject(&bm); }wjw:M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "3"V3w  
 tdc.SelectObject(pOld); N1S{suic  
 BITMAP btm; {G0T$,'DR  
 bm.GetBitmap(&btm); Oo8VeRZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &yTqZ*Yuk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p* (JjH  
 BITMAPINFOHEADER bih; Lpz>>}  
 bih.biBitCount=btm.bmBitsPixel; Yty/3T3)e  
 bih.biClrImportant=0; Mj?`j_X  
 bih.biClrUsed=0; /-qNh >v4  
 bih.biCompression=0; :&rt)/I  
 bih.biHeight=btm.bmHeight; k&q;JyUi  
 bih.biPlanes=1; <QAFL uey  
 bih.biSize=sizeof(BITMAPINFOHEADER); V-2(?auZd  
 bih.biSizeImage=size; |t&>5HM  
 bih.biWidth=btm.bmWidth; _LUhZlw  
 bih.biXPelsPerMeter=0; \0I_<  
 bih.biYPelsPerMeter=0; ,RI Gc US  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]^'Kd*x  
 static int filecount=0; l0w]`EE  
 CString name; m@F`!qY~Y\  
 name.Format("pict%04d.bmp",filecount++); Q&ptc>{bH6  
 name=m_Path+name; x8\?}UnB  
 BITMAPFILEHEADER bfh; y`5 9A  
 bfh.bfReserved1=bfh.bfReserved2=0; Jr!JHC9i  
 bfh.bfType=((WORD)('M'<< 8)|'B'); D~iz+{Q4  
 bfh.bfSize=54+size; >d*@_ kJM  
 bfh.bfOffBits=54; !bx;Ta.  
 CFile bf; )Y0!~# `  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .x.]`b(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ")5":V~fN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rgv?gaQ>  
  bf.WriteHuge(lpData,size); l -mfFN  
  bf.Close(); w"|L:8  
  nCount++; !cLo> ,4  
 } a=1@*ID  
 GlobalFreePtr(lpData); 8.=BaNU  
 if(nCount==1) =.U[$~3q%  
  m_Number.Format("%d picture captured.",nCount); q=m'^ ,gPS  
 else oj<gD  
  m_Number.Format("%d pictures captured.",nCount); $am$ EU?s  
  UpdateData(FALSE); t!X. |`h  
} :zbQD8jv  
Hqx-~hQO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mzKiO_g}  
{ hJ? O],4J  
 if(pMsg -> message == WM_KEYDOWN) 9(7-{,c  
 { _p/UsJ  
  if(pMsg -> wParam == VK_ESCAPE) aEWWP]  
   return TRUE; 1Z2HUzqh.  
  if(pMsg -> wParam == VK_RETURN) t+ G#{n  
   return TRUE; A#<?4&  
 } V>LwqS~`  
 return CDialog::PreTranslateMessage(pMsg); .},'~NM]  
} 7`Ak) F:V  
h0f;F@I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~?Pw& K2  
{ 6OIte -c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eA?RK.e  
  SaveBmp(); fu ,}1Mq#  
  return FALSE; qkY:3Ozw  
} :#ik. D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nEy&>z  
 CMenu pop; ,HV(l+k {|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0<@KG8@hI;  
 CMenu*pMenu=pop.GetSubMenu(0); Yn Mvl  
 pMenu->SetDefaultItem(ID_EXITICON); RJ&RTo  
 CPoint pt; lh7#t#  
 GetCursorPos(&pt); ncdKj}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (OL4Ex']  
 if(id==ID_EXITICON) MK~8}x2K  
  DeleteIcon(); $6 9&O  
 else if(id==ID_EXIT) %E>Aw>] v  
  OnCancel(); wo/\]5  
 return FALSE;  KC6.Fr{  
} [kB7@o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  `25yE/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) M h}m;NI  
 AddIcon(); gO-  _  
 return res; pa3{8x{9m  
} OLGE!&!>  
7U"g3 a)=  
void CCaptureDlg::AddIcon() 2- h{N  
{ q:0N<$63  
 NOTIFYICONDATA data; 783,s_  
 data.cbSize=sizeof(NOTIFYICONDATA); >T-u~i$s  
 CString tip; *n ]GsOOn  
 tip.LoadString(IDS_ICONTIP); C2I_%nU Z1  
 data.hIcon=GetIcon(0); p%Vt#?q  
 data.hWnd=GetSafeHwnd(); &`r-.&Y  
 strcpy(data.szTip,tip); -3 *]G^y2  
 data.uCallbackMessage=IDM_SHELL; m dg8,n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k%#EEMh  
 data.uID=98; 4.aZ# c91_  
 Shell_NotifyIcon(NIM_ADD,&data); FVbb2Y?R  
 ShowWindow(SW_HIDE); f~R(D0@  
 bTray=TRUE; %)1?TU  
} 'GWN~5  
|aS.a&vwR  
void CCaptureDlg::DeleteIcon() @*XV`_!h  
{  4e7-0}0  
 NOTIFYICONDATA data; s 5Qcl;}  
 data.cbSize=sizeof(NOTIFYICONDATA); #gN&lY:CFn  
 data.hWnd=GetSafeHwnd(); bsli0FJSh'  
 data.uID=98; _J#zY- j  
 Shell_NotifyIcon(NIM_DELETE,&data); lfgq=8d  
 ShowWindow(SW_SHOW); Qd{CMm x  
 SetForegroundWindow(); ;ef}}K  
 ShowWindow(SW_SHOWNORMAL); o:'MpKm  
 bTray=FALSE; J yK3{wYS  
} 3;9^  
Mfuv0P~  
void CCaptureDlg::OnChange() 4F:\-O  
{ f'RX6$}\1X  
 RegisterHotkey(); eM6<%?b  
} Dml;#'IF3  
v;{#Q&(  
BOOL CCaptureDlg::RegisterHotkey() _;y9$"A  
{ d7 y[0<xM  
 UpdateData(); Bk c4TO  
 UCHAR mask=0; Hvi49c]]  
 UCHAR key=0; 2l'6.  
 if(m_bControl) jB2[(  
  mask|=4; <'Eme  
 if(m_bAlt) g:@#@1rB6  
  mask|=2; _|2:_N=   
 if(m_bShift) <xm7qmqI  
  mask|=1; .~;\eW[  
  key=Key_Table[m_Key.GetCurSel()]; ?l{nk5,?-Y  
 if(bRegistered){ C{rcs'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hi( ;;C9  
  bRegistered=FALSE; 2F.;;Ab  
 } ADzhNf S  
 cMask=mask; 9cF[seE"0  
 cKey=key; ]%H`_8<gc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >tr}|>  
 return bRegistered; cuI TY^6  
} _TZRVa_  
h438`  
  四、小结  mq.`X:e  
C< tl/NC  
  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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