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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: N'CW Sf.e  
  AH?[K,3  
  一、实现方法 KquuM ]5S  
J%lrXm(l{  
  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: }0sLeGJ!  
5"ooam3  
#pragma data_seg("shareddata") ..5. ":  
HHOOK hHook =NULL; //钩子句柄 MnlD87x@X  
UINT nHookCount =0; //挂接的程序数目 b~2LD3"3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6z]y =J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 WD1>{TSn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1'P4{T0 [  
static int KeyCount =0; B4*uS (  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0oZZLi  
#pragma data_seg() z4(`>z2a  
6s>io%,:  
  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。 {0 %  
q/Zs]Gz  
  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: SLNq%7apx  
YP[8d,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR UXh%DOq   
cKey,UCHAR cMask) N,UUM|?9_  
{ "MK2QIo  
 BOOL bAdded=FALSE; b7'l3mQjk  
 for(int index=0;index<MAX_KEY;index++){ %{rPA3Xoy  
  if(hCallWnd[index]==0){ _SkiO }c8  
   hCallWnd[index]=hWnd; @urZ  
   HotKey[index]=cKey; ! ?>I  
   HotKeyMask[index]=cMask; SAdo9m'  
   bAdded=TRUE; -q8l"i>h=  
   KeyCount++; ^j2ve's:  
   break; 9{e/ V)  
  } o'Fyo4Qd  
 } ObJ-XNcNH  
 return bAdded; <oi'yr  
} 3h$E^"  
//删除热键 !pC`vZG"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j#u{(W'r  
{ YkE_7r(1  
 BOOL bRemoved=FALSE; BHiG3fP  
 for(int index=0;index<MAX_KEY;index++){ m WHyk"l  
  if(hCallWnd[index]==hWnd){ B`||4*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `+0dz,  
    hCallWnd[index]=NULL; e tL?UF$  
    HotKey[index]=0; B_D0yhh  
    HotKeyMask[index]=0; zeq")A  
    bRemoved=TRUE; IVy<>xpt  
    KeyCount--; oW(EV4J"  
    break; `$XB_ o%@  
   } yo(MJ^=d  
  } X|&H2y|*7  
 } $xK\$kw\  
 return bRemoved; "ZPgl 8  
} \RtFF  
V(:wYk?ZR  
>?_}NZ,y  
  DLL中的钩子函数如下: y^[t3XA6Q  
a5aHv/W#P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3t9CN )*  
{ A6J:!sY4A  
 BOOL bProcessed=FALSE; -ssmj8:Q\|  
 if(HC_ACTION==nCode) >&ZlC E  
 { `7'^y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2h#.:!/SMw  
   switch(wParam) )\PX1198  
   {  IuA4eDr^Y%  
    case VK_MENU: Onh R`  
     MaskBits&=~ALTBIT; mU  
     break; NpCQ4 K  
    case VK_CONTROL: WnOvU<Z <  
     MaskBits&=~CTRLBIT; 'Z:wEt!  
     break; KFRf5^%  
    case VK_SHIFT: `(gQw~|z  
     MaskBits&=~SHIFTBIT; cK2;)&U7  
     break; Ux{0)"fj  
    default: //judge the key and send message :>Bk^"  
     break; bBV03_*  
   } q#I'@Jbj  
   for(int index=0;index<MAX_KEY;index++){ iBtG@M  
    if(hCallWnd[index]==NULL) TvS<;0~K  
     continue; 4[&&E7]EX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N8k=c3|  
    { V#|/\-@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); GY.iCub  
     bProcessed=TRUE; &}0QnO_mj  
    } 9[teG5wA a  
   } 23Dld+E&  
  } Nr+~3:3  
  else if((lParam&0xc000ffff)==1){ //有键按下 Yyd]s\W  
   switch(wParam) {:b~^yW  
   { zb4{nzX=  
    case VK_MENU: j%D{z5,nKm  
     MaskBits|=ALTBIT; R'6(eA[K  
     break; wnK6jMjkSf  
    case VK_CONTROL: ^*+M9e9Z  
     MaskBits|=CTRLBIT; -T i<H9OV  
     break; C9!FnvH  
    case VK_SHIFT: bfEH>pQ>#  
     MaskBits|=SHIFTBIT; Q+wO\TtE  
     break; Q'!'+;&%  
    default: //judge the key and send message MM*~X"A  
     break; mdQe)>  
   } xpCZlOld  
   for(int index=0;index<MAX_KEY;index++){ _~{J."q  
    if(hCallWnd[index]==NULL) P;-.\VRu  
     continue; ya5HAs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Iz83T9I&  
    { aMxj{*v7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~l?c.CS d  
     bProcessed=TRUE; N$v_z>6Z  
    } ,fTC}>s4  
   } >mpNn  
  } m+:JNgX6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :-<30LS $  
   for(int index=0;index<MAX_KEY;index++){ n qx0#_K-E  
    if(hCallWnd[index]==NULL) 63_#*6Pv28  
     continue; Ayv:Pv@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V6_5v+n  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cH$( *k9%M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dtTfV.y4w  
   } 7cWeB5 e?O  
  } [i.c;'Wy/  
 } W`c$2KS?DO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6rWq hIaI  
} R,["w9 8a  
)V+/@4  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: I<,~>'cq.  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K7.ayM 0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3-6MGL9  
[` }w7  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: {O).!  
!fd>wvJ,:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0VNpd~G$  
{ r..f$FF)\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) c`hENPhW  
 { zHg=K /  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7HY8 F5Brx  
  SaveBmp(); )E7wBNV   
  return FALSE; L[<Y6u>m!1  
 } BNA1"@9q  
 …… //其它处理及默认处理 xdDe@G;"  
} t^>P,%$  
V2AsZc0U(  
rZ5xQ#IA  
  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。 \,n X/f  
EE|c@M^  
  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。 J>G'H)  
EAm31v C  
  二、编程步骤 &OE-+z  
@$L|   
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ePl+ M  
aIQC[ry  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^c9_F9N  
nT2b"wkTT  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; #`U?,>2q  
\CE+P5  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; R.l!KIq  
2 M\7j  
  5、 添加代码,编译运行程序。 n@h$V\&\iM  
6/Yo0D>M$  
三、程序代码 4+nZ4a>LH?  
$Q}L*4?]  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL p,|)qr:M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) R/fE@d2~In  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 92R,o'#  
#if _MSC_VER > 1000 F7w\ctUP  
#pragma once OC-d5P  
#endif // _MSC_VER > 1000 wu11)HFL|z  
#ifndef __AFXWIN_H__ 7J`v#  
#error include 'stdafx.h' before including this file for PCH ;;rx)|\<R  
#endif ^&y*=6C  
#include "resource.h" // main symbols  t5S|0/f  
class CHookApp : public CWinApp J}4RJ9  
{ VPuo!H  
 public: p\#;(pf}s  
  CHookApp(); 5 8L@:>"  
  // Overrides ]TUoXU2<x  
  // ClassWizard generated virtual function overrides /X0<2&v  
  //{{AFX_VIRTUAL(CHookApp) yw%E S  
 public: L0H^S)g  
  virtual BOOL InitInstance(); xC= $ym]  
  virtual int ExitInstance(); i$}G[v<4  
  //}}AFX_VIRTUAL aO?KRn  
  //{{AFX_MSG(CHookApp) nGK=Nf.5  
  // NOTE - the ClassWizard will add and remove member functions here. $7xfLS8Vo  
  // DO NOT EDIT what you see in these blocks of generated code ! uh#E^~5S  
  //}}AFX_MSG j jv'"K2  
  DECLARE_MESSAGE_MAP() F3$8l[O_  
}; BILZ XMf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Mh3L(z]/E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |HJ`uGN<b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ) k[XO  
BOOL InitHotkey(); _Gb 7n5p  
BOOL UnInit(); ,1!Y!,xy  
#endif S;iD~>KP  
.wWf#bB  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8@rF~^-_  
#include "stdafx.h" .#a7?LUH  
#include "hook.h" |a /cw"  
#include <windowsx.h> 0$Zh4Y  
#ifdef _DEBUG )@y'$)5s  
#define new DEBUG_NEW NU{eoqaT  
#undef THIS_FILE 0pB'^Q{  
static char THIS_FILE[] = __FILE__; P@n rcgM.  
#endif 3BLH d<  
#define MAX_KEY 100 t4~?m{  
#define CTRLBIT 0x04 2v4&'C  
#define ALTBIT 0x02 B VH)!]m0  
#define SHIFTBIT 0x01 qX6zk0I a  
#pragma data_seg("shareddata") "]'W^Fg  
HHOOK hHook =NULL; x 0vW9*&  
UINT nHookCount =0; i!JSEQ_8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $Op:-aW&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8Jp?@qt=$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey prIJjy-F  
static int KeyCount =0; Oq3t-omXS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !^1oH**  
#pragma data_seg() B%))HLo'  
HINSTANCE hins; (U.VCSn  
void VerifyWindow(); fHI@' '0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =M4wP3V/  
//{{AFX_MSG_MAP(CHookApp) K&dc< 4DC  
// NOTE - the ClassWizard will add and remove mapping macros here. VzcW9'"#  
// DO NOT EDIT what you see in these blocks of generated code! /z)8k4  
//}}AFX_MSG_MAP +, rm  
END_MESSAGE_MAP() v] Xy^7?  
n4"xVDL  
CHookApp::CHookApp() h4ghMBo%  
{ 1.~^QH\p?3  
 // TODO: add construction code here, .>y3`,0h  
 // Place all significant initialization in InitInstance $m+Pl[s  
} *_Pkb.3R  
t)(>E'X x  
CHookApp theApp; 8jLO-^X<<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s>>lf&7  
{ +K;%sAZy  
 BOOL bProcessed=FALSE; RzLeR%O  
 if(HC_ACTION==nCode) ms+gq  
 { -*?{/QmKb  
  if((lParam&0xc0000000)==0xc0000000){// Key up :4"b(L  
   switch(wParam) Lr"`OzDz  
   { I;P!   
    case VK_MENU: {gDoktC@M  
     MaskBits&=~ALTBIT; ^*~4[?]S  
     break; ?DNeL;6  
    case VK_CONTROL: &,]yqG 2  
     MaskBits&=~CTRLBIT; lx82:_  
     break; y] $- :^  
    case VK_SHIFT: g J$m'kC;  
     MaskBits&=~SHIFTBIT; MSt@yKq  
     break; Z$)jPDSr  
    default: //judge the key and send message %.{xo.`a[  
     break; |l?*' =  
   } gvP.\,U  
   for(int index=0;index<MAX_KEY;index++){ PC!X<C8*  
    if(hCallWnd[index]==NULL) U/rFH9e$  
     continue; ,/Y$%.Rp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _9iF`Q  
    { ]U 1S?p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h#|Ac>fz  
     bProcessed=TRUE; sNC~S%[  
    } VOp+6ho<  
   } -N2m|%B  
  } -PiZvge  
  else if((lParam&0xc000ffff)==1){ //Key down ZQ#AEVI,  
   switch(wParam) .8CfCRq  
   { q&wv{  
    case VK_MENU: ~~WX#Od*$  
     MaskBits|=ALTBIT; !/e8x;_  
     break; %Vsg4DRy  
    case VK_CONTROL: Lez]{%+.`[  
     MaskBits|=CTRLBIT; KVpQ,x&q~  
     break; 8RVeKnpXTV  
    case VK_SHIFT: l-[5Zl;"  
     MaskBits|=SHIFTBIT; @#5?tk0  
     break; ]=]`Mnuxb  
    default: //judge the key and send message HR?a93  
     break; '494^1"io  
   } G0x!:[  
   for(int index=0;index<MAX_KEY;index++) hB]<li)"C  
   { L0xh?B  
    if(hCallWnd[index]==NULL) -$y/*'  
     continue; ~NO'8 Mr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1 swqs7rR|  
    { (R{z3[/u&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Xm.["&  
     bProcessed=TRUE; I;?np  
    } mC`U"rlK~  
   } y@]:7  
  } G\S_e7$ /  
  if(!bProcessed){ rJcZ a#  
   for(int index=0;index<MAX_KEY;index++){ Q .cL1uHc  
    if(hCallWnd[index]==NULL) iA+zZVwO  
     continue; }cI _$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p!cNn7{;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); st(Y{Gs  
   } 'Z^KpW  
  } "NO*(<C.R  
 } eP|hxqM&9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ",Fqpu&M  
} 0kld77tn 2  
Csx??T_>r  
BOOL InitHotkey() ~`Rooh3m  
{ @LDu08lr  
 if(hHook!=NULL){ }F)eA1  
  nHookCount++; ~^"s.Lsb  
  return TRUE; +WFa4NZ  
 } @)Sd3xw[  
 else * n>YS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |K$EULzz  
  if(hHook!=NULL) ]Y6y ]u  
   nHookCount++; i.>d#S  
  return (hHook!=NULL); 17;qJ_T)  
} 4ew#@  
BOOL UnInit() v@]\  P<E  
{ QU^?a~r  
 if(nHookCount>1){ w<=-n ;2  
  nHookCount--; se]QEd7]7  
  return TRUE; ln=:E$jX  
 } YU%U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KH76Vts  
 if(unhooked==TRUE){ WEugm603  
  nHookCount=0; ,[ M^rv  
  hHook=NULL; e5.sqft  
 } FKu^{'Y6E0  
 return unhooked; /hbdQm  
} Ng<oz*>U  
H}&4#CQ'!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TY *q[AWG  
{ AG<TY<nqL  
 BOOL bAdded=FALSE; W!WeYV}kb  
 for(int index=0;index<MAX_KEY;index++){ 1jQlwT(:  
  if(hCallWnd[index]==0){ Fpf-Fa-K\b  
   hCallWnd[index]=hWnd; .ID9Xd$fky  
   HotKey[index]=cKey; %(n^re uP  
   HotKeyMask[index]=cMask; GF awmNZ  
   bAdded=TRUE; a'A'%+2  
   KeyCount++; $ &fm^1  
   break; dRnO5 7+{  
  } T6p2=o&p  
 } sBm/9vu  
 return bAdded; #_[W*-|L  
} RiM!LX  
g7U>G=,;?U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^6I8a"  
{ |+(Hia,X  
 BOOL bRemoved=FALSE; c,RY j  
 for(int index=0;index<MAX_KEY;index++){ P0^7hSo  
  if(hCallWnd[index]==hWnd){ cvl1 X"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *Wz\FixP0  
    hCallWnd[index]=NULL; bR;Wf5  
    HotKey[index]=0; AwO'%+Bv  
    HotKeyMask[index]=0; 92S,W?(  
    bRemoved=TRUE; -axV;+"b  
    KeyCount--; rA#Ji~  
    break; Y!L<& sl   
   } G .k\N(l  
  } [I7([l1Wvd  
 } y@Q? guB  
 return bRemoved; YO^iEI.  
} W0>fu>  
)MJy  
void VerifyWindow() GjvTYg~  
{  $>y   
 for(int i=0;i<MAX_KEY;i++){ '2.11cM3  
  if(hCallWnd!=NULL){ dX:#KdK  
   if(!IsWindow(hCallWnd)){ maTZNzy  
    hCallWnd=NULL; TdH~ sz  
    HotKey=0; TZ+2S93c  
    HotKeyMask=0; `h|>;u   
    KeyCount--; 1$G'Kg/  
   } X-=J7G`\h#  
  } 1(12`3  
 } ;Q} H'Wg,  
} 4 Gm(P~N  
N: Zf4  
BOOL CHookApp::InitInstance() gR:21*&cz  
{ bB|P`l L  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "sU  ~|  
 hins=AfxGetInstanceHandle(); [ O"8Tzr  
 InitHotkey(); =3Hv  
 return CWinApp::InitInstance(); Um'r6ty  
} mrz@Y0mgL  
ngHPOI16  
int CHookApp::ExitInstance() 6$^dOJ_"  
{ H0.,h;  
 VerifyWindow(); }8cX0mZ1j  
 UnInit(); $1$T2'C~+  
 return CWinApp::ExitInstance(); ;BMm47<  
} rCa2$#Z  
z7P] g C$\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =q-HR+  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Rr>h8Ni <  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hPHrq{YZ  
#if _MSC_VER > 1000 @|GKNW#  
#pragma once d~b#dcv$"  
#endif // _MSC_VER > 1000 vAMr&[  
I!1nB\l  
class CCaptureDlg : public CDialog Y2,\WKa  
{ $"&U%3  
 // Construction aY7.<p*a  
 public: H;O PA8\n  
  BOOL bTray; f:-dw6a=s  
  BOOL bRegistered; U\Hd?&`9gz  
  BOOL RegisterHotkey(); SZ m)`r\A  
  UCHAR cKey; W=k%aB?p  
  UCHAR cMask; Ly$s0.!  
  void DeleteIcon(); -'OO6mU  
  void AddIcon(); NJglONO  
  UINT nCount; h8MkfHH7{  
  void SaveBmp(); ]XH}G9X^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JrdH6Zg  
  // Dialog Data ].eY]o}=  
  //{{AFX_DATA(CCaptureDlg) )tV^)n[w  
  enum { IDD = IDD_CAPTURE_DIALOG }; BsX# ~  
  CComboBox m_Key; SLze) ?.  
  BOOL m_bControl; ?)~j>1"S  
  BOOL m_bAlt; $ (gR^L  
  BOOL m_bShift; @GiR~bKZ  
  CString m_Path; $iblLZhj  
  CString m_Number; %aszZP  
  //}}AFX_DATA :9E_L2M  
  // ClassWizard generated virtual function overrides CF`fn6  
  //{{AFX_VIRTUAL(CCaptureDlg) tyLR_@i%%  
 public: MXxE)"G*a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); P00pSRQHD  
 protected: K{&b "Ba1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 42m}c1R  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /j1p^=ARV  
  //}}AFX_VIRTUAL CXs i  
  // Implementation h8yv:}XU*  
 protected: .ZxH#l _  
  HICON m_hIcon; 6GD Uo}.  
  // Generated message map functions XTZI !  
  //{{AFX_MSG(CCaptureDlg) j8G>0f)  
  virtual BOOL OnInitDialog(); %T&#JF+;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ",ic" ~  
  afx_msg void OnPaint(); Nv iPrp>c  
  afx_msg HCURSOR OnQueryDragIcon(); ZREAEGi{  
  virtual void OnCancel(); H5N(MihT  
  afx_msg void OnAbout(); JqdNO:8  
  afx_msg void OnBrowse(); n>dM OQb  
  afx_msg void OnChange(); "p\XaClpz  
 //}}AFX_MSG N3};M~\  
 DECLARE_MESSAGE_MAP() adJoT-8P6  
}; %-4e8d74/  
#endif W&>+~A  
)pVxp]EI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file CDcs~PR@B  
#include "stdafx.h" h,@x5q>g  
#include "Capture.h" Wb4%=2Qn  
#include "CaptureDlg.h" 3\,TI`^C  
#include <windowsx.h> Xm`K@hJ@  
#pragma comment(lib,"hook.lib") JHf}LZu  
#ifdef _DEBUG C%P"Ds=w0N  
#define new DEBUG_NEW hfvs' .  
#undef THIS_FILE e;=G|E  
static char THIS_FILE[] = __FILE__; b* 6c.  
#endif r[$Qtj Q  
#define IDM_SHELL WM_USER+1 ~X;(m<f2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w?AE8n$8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >NwrJSx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +{/zP{jH  
class CAboutDlg : public CDialog `,(1'  
{ `.dTkL  
 public: zYOPE 6E  
  CAboutDlg(); Q9[dUdQm  
  // Dialog Data %a/O7s6  
  //{{AFX_DATA(CAboutDlg) ,>(M5\Z/c  
  enum { IDD = IDD_ABOUTBOX }; H[x9 7r  
  //}}AFX_DATA ji( S ?^  
  // ClassWizard generated virtual function overrides 4(JxZ49  
  //{{AFX_VIRTUAL(CAboutDlg) .)Se-'  
 protected: r _r$nl  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nX Qz  
  //}}AFX_VIRTUAL ej<z]{`05  
  // Implementation Smk]G))o{  
 protected: xiRTp:>  
  //{{AFX_MSG(CAboutDlg) 6x@-<{L  
  //}}AFX_MSG 1&YP}sg)  
  DECLARE_MESSAGE_MAP() _@jKFDPL  
}; UsQv!Cwu^  
2$NP46z}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RpLm'~N'  
{ O!f* @  
 //{{AFX_DATA_INIT(CAboutDlg) ]?)zH:2)  
 //}}AFX_DATA_INIT PJ Air8  
} }qz58]fyx  
rI]:| k  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )KRO=~Y  
{ q#\eL~k  
 CDialog::DoDataExchange(pDX); WaMn[/{  
 //{{AFX_DATA_MAP(CAboutDlg) d(a6vEL4  
 //}}AFX_DATA_MAP Iz{AA-  
} ((dG<  
.^kTb2$X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z|P& 8#txM  
 //{{AFX_MSG_MAP(CAboutDlg) wU#Q>ut'%  
 // No message handlers 9 I RE@c  
 //}}AFX_MSG_MAP #8/Z)-G  
END_MESSAGE_MAP() dy`~%lX?  
N7#GK]n%/}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) g dC=SFb b  
: CDialog(CCaptureDlg::IDD, pParent) )QZ?Bf  
{ 6ldDt?iSg  
 //{{AFX_DATA_INIT(CCaptureDlg) fQx 4/4j  
  m_bControl = FALSE; SwP h-6  
  m_bAlt = FALSE; b'-gy0  
  m_bShift = FALSE; 5 ?vIkf  
  m_Path = _T("c:\\"); j#p3c  
  m_Number = _T("0 picture captured."); G#% =R`k/  
  nCount=0; % 9WWBxS  
  bRegistered=FALSE; *`jEg=)  
  bTray=FALSE; ZRxB"a'  
 //}}AFX_DATA_INIT i&LbSxUh9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3 oWCQ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1g/mzC   
} Bv=Z*"Fv  
rfPJBD{Ve  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *pWswcV/  
{ !E7/:t4  
 CDialog::DoDataExchange(pDX); ;%82Z4  
 //{{AFX_DATA_MAP(CCaptureDlg) d#z67Nl6  
  DDX_Control(pDX, IDC_KEY, m_Key); "{0kg'fU  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3 S5QqAm  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /r?X33D!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =C:0 ='a  
  DDX_Text(pDX, IDC_PATH, m_Path); R\+$^G}#6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q{_buTARq  
 //}}AFX_DATA_MAP lp]O8^][&  
} 5g&'n  
c&_3"2:  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %Bo Jt-v  
//{{AFX_MSG_MAP(CCaptureDlg) XnG!T$  
 ON_WM_SYSCOMMAND() V?rI,'F>N  
 ON_WM_PAINT() ]JM9 ^F  
 ON_WM_QUERYDRAGICON() 54)}^ftY^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) g{a0,B/j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) uIPR*9~6o  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $i`YtV  
//}}AFX_MSG_MAP kdo)y(fn@  
END_MESSAGE_MAP() Z2@&4_P  
QDDSJ>l5_T  
BOOL CCaptureDlg::OnInitDialog() kB:R- St  
{ @)0g Xg  
 CDialog::OnInitDialog(); IWQ8e$N  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DuFlN1Z  
 ASSERT(IDM_ABOUTBOX < 0xF000); }ps6}_FE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l:[=M:#p  
 if (pSysMenu != NULL) N!va12  
 { G dooy~cn  
  CString strAboutMenu; < <xJ-N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); e'?(`yW>  
  if (!strAboutMenu.IsEmpty()) {oZ]1Qf_  
  { PQs9@]w[  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2KX *x_-   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); NSkI2>+P  
  } P6?Q;-\q0  
 } w7W-=\Hvh  
 SetIcon(m_hIcon, TRUE); // Set big icon #nd,cn  
 SetIcon(m_hIcon, FALSE); // Set small icon #*`|}_6L  
 m_Key.SetCurSel(0); 8_ LDS  
 RegisterHotkey(); r#j*vO '  
 CMenu* pMenu=GetSystemMenu(FALSE); :=8vy  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); RU'J!-w{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HvngjP{>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I[|I\tW  
 return TRUE; // return TRUE unless you set the focus to a control ls5S9R 5  
} Cm&itG  
Tv KX8m"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) aG ,uF  
{ &V ;a:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .6hH}BM  
 { Mu%'cwp$  
  CAboutDlg dlgAbout; 8BN'fWl&E  
  dlgAbout.DoModal(); &d2/F i+  
 } o]j*  
 else <eI;Jph5  
 { _Dv^~e1c  
  CDialog::OnSysCommand(nID, lParam); {xr]xcM'b  
 } (/Mc$V  
} 6 qq7:  
Em 7q@  
void CCaptureDlg::OnPaint() 8?$2;uGL  
{ oMVwId f  
 if (IsIconic()) Zry>s0  
 { :8ZxOwwv  
  CPaintDC dc(this); // device context for painting Y `{U45  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q}!4b'z^  
  // Center icon in client rectangle c'6H@m#=  
  int cxIcon = GetSystemMetrics(SM_CXICON); }B5I#Af7  
  int cyIcon = GetSystemMetrics(SM_CYICON); PX'LN  
  CRect rect; Dz{e@+>M  
  GetClientRect(&rect); i~;8'>:|,M  
  int x = (rect.Width() - cxIcon + 1) / 2; 4|(?Wt)5  
  int y = (rect.Height() - cyIcon + 1) / 2; j.6kjQN  
  // Draw the icon 2*|]#W  
  dc.DrawIcon(x, y, m_hIcon); UdGoPzN  
 } GxkG$B  
 else oxzNV&D[{`  
 { 7I|%GA_  
  CDialog::OnPaint(); gU?)  
 } a:fHTU=\p  
} ~JXHBX  
%Z7!9+<  
HCURSOR CCaptureDlg::OnQueryDragIcon() qkIU>b,B  
{ $o/>wgQY-  
 return (HCURSOR) m_hIcon; @2mP  
} 9ZBF1sMg  
[a3 0iE  
void CCaptureDlg::OnCancel() >$y >  
{ FMn&2fH  
 if(bTray) +@Y[i."^J  
  DeleteIcon(); +6=!ve}  
  CDialog::OnCancel(); I?K0bs+6  
} cGp^;> ]M  
 q0~_D8e,  
void CCaptureDlg::OnAbout() _a&|,ajy >  
{ e0L;V@R  
 CAboutDlg dlg; ,:`6x[ +  
 dlg.DoModal(); ]c)SVn$6  
} {9Y'v  
`9ox?|iJ  
void CCaptureDlg::OnBrowse() $<v_Vm?6d  
{ K288&D|1WU  
 CString str; :~(im_r  
 BROWSEINFO bi; !A!\S/x4  
 char name[MAX_PATH]; R%%`wmG)"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); h uJqqC  
 bi.hwndOwner=GetSafeHwnd(); CC\z_C*P-p  
 bi.pszDisplayName=name; K\b O[J  
 bi.lpszTitle="Select folder"; +HX'AC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +]-KzDsr"V  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); lIz_0rE  
 if(idl==NULL) 2An`{')  
  return; Bt,Xe~$z-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R~~rqvLm  
 str.ReleaseBuffer(); =@2V#X]M*  
 m_Path=str; !)O$Q}'\  
 if(str.GetAt(str.GetLength()-1)!='\\') >|?T|  
  m_Path+="\\"; yr>bL"!CA  
 UpdateData(FALSE); ;X(n3F  
} x1wxB 1)2  
2?QJh2  
void CCaptureDlg::SaveBmp() Q$1K{14I  
{ PAHlj,n)  
 CDC dc; 0Mg8{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F :S,{&jB  
 CBitmap bm; W[Bu&?h$  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7g)3\C   
 int Height=GetSystemMetrics(SM_CYSCREEN); @@wx~|%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); CeTr%j  
 CDC tdc; +,Az\aT/%  
 tdc.CreateCompatibleDC(&dc); |xVCl<{F%  
 CBitmap*pOld=tdc.SelectObject(&bm); [.X%:H+  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  2JP?6N  
 tdc.SelectObject(pOld); _m],(J=,z  
 BITMAP btm; )\-";?sYky  
 bm.GetBitmap(&btm); (L$~ zw5gr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |8 bO5l:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FRFAWK<  
 BITMAPINFOHEADER bih; au|^V^m  
 bih.biBitCount=btm.bmBitsPixel; d|]O<]CG_  
 bih.biClrImportant=0; K;[%S  
 bih.biClrUsed=0; AxlFU~E4  
 bih.biCompression=0; f_ztnRw  
 bih.biHeight=btm.bmHeight; /y)"j#-eW  
 bih.biPlanes=1; jJZsBOW[8  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8%<`$`FyU  
 bih.biSizeImage=size; 8/"|VE DOr  
 bih.biWidth=btm.bmWidth; V=&,^qZ  
 bih.biXPelsPerMeter=0; abeSkWUL(  
 bih.biYPelsPerMeter=0; DYlvxF`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :(>9u.>l?5  
 static int filecount=0; -l H>8+  
 CString name; | ",[C3Jg  
 name.Format("pict%04d.bmp",filecount++); OZD!#YI  
 name=m_Path+name; R9h>I3F=c  
 BITMAPFILEHEADER bfh; p{q!jm~Nq  
 bfh.bfReserved1=bfh.bfReserved2=0; 4q13xX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); c1kxKxE  
 bfh.bfSize=54+size; ]<gCq/V#  
 bfh.bfOffBits=54; 5 xDN&su  
 CFile bf;  YX`=M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T:dm0iau  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _AYC|R|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); EWIc|b:  
  bf.WriteHuge(lpData,size); 3]<re{)J9O  
  bf.Close(); ;#s}b1  
  nCount++; liqR#<  
 } iN_D8dI  
 GlobalFreePtr(lpData); =5~F6to  
 if(nCount==1) <m,yFk  
  m_Number.Format("%d picture captured.",nCount); |90 +)/$4  
 else Xexe{h4t_>  
  m_Number.Format("%d pictures captured.",nCount); Pzp+I}  
  UpdateData(FALSE); pXh~#o6 V  
} K\+}q{  
&4Con%YU[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HI\f>U  
{ *fi;ZUPW3  
 if(pMsg -> message == WM_KEYDOWN) P%sO(_PuT  
 { W Gw!Y1wq  
  if(pMsg -> wParam == VK_ESCAPE) 2l@"p!ar=  
   return TRUE; kq~[k.  
  if(pMsg -> wParam == VK_RETURN) 8ts+'65|F  
   return TRUE; vA"niO  
 } \c~{o+UD-  
 return CDialog::PreTranslateMessage(pMsg); knOn UU  
} ,p!B"# ot  
030U7VT1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z5` 8G =A  
{ EeJqszmH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j;20JA/b  
  SaveBmp(); 0[:9 Hb6  
  return FALSE; OR\DTLIl  
} pEVgJ/>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #[a"%byTR  
 CMenu pop; ) wY!/&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g&+Y{*Gp  
 CMenu*pMenu=pop.GetSubMenu(0); qC1U&b#MVx  
 pMenu->SetDefaultItem(ID_EXITICON); Pc)VK>.fc  
 CPoint pt; U2V^T'Y[  
 GetCursorPos(&pt); g[s\~MF@s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z-SwJtWk  
 if(id==ID_EXITICON) *SkiFEoD  
  DeleteIcon(); j\'+wVyo  
 else if(id==ID_EXIT) p x|>v8  
  OnCancel(); 1Vf78n  
 return FALSE; oY%"2PW1B  
} a1G9wC:e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *i?rJH  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |vfujzRZ  
 AddIcon(); +z|UpI  
 return res; 3gG+`{<  
} "65||[=8  
*:9 >W$0u  
void CCaptureDlg::AddIcon() H 5U x.]y  
{ .vN%UNu  
 NOTIFYICONDATA data; 2K]IlsMO&  
 data.cbSize=sizeof(NOTIFYICONDATA); Y:%m;b$]  
 CString tip; drENkS=,  
 tip.LoadString(IDS_ICONTIP); |,;twj[?4  
 data.hIcon=GetIcon(0); b+IOh|  
 data.hWnd=GetSafeHwnd(); 3zB|!p C6s  
 strcpy(data.szTip,tip); `u#;MUg  
 data.uCallbackMessage=IDM_SHELL; 2"leUur~rO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1Sg|3T8bGT  
 data.uID=98; f4'El2>-86  
 Shell_NotifyIcon(NIM_ADD,&data); v`S2M  
 ShowWindow(SW_HIDE); }A1|jY)x  
 bTray=TRUE; *#lBQBH|.  
} @%OPy|=,{  
& =73D1A  
void CCaptureDlg::DeleteIcon() "($Lx  
{ 9jO`gWxV8*  
 NOTIFYICONDATA data; &_9YLXtMi;  
 data.cbSize=sizeof(NOTIFYICONDATA); 'u(=eJ@1  
 data.hWnd=GetSafeHwnd(); [J)/Et  
 data.uID=98; 7`IUMYl#~  
 Shell_NotifyIcon(NIM_DELETE,&data); cgs3qI  
 ShowWindow(SW_SHOW); -,QKTxwo>  
 SetForegroundWindow(); e^k!vk-SLF  
 ShowWindow(SW_SHOWNORMAL); ;Y'8:ncDn  
 bTray=FALSE; 6| *(dE2x(  
} 7q%|4Z-~  
C}b|2y  
void CCaptureDlg::OnChange() #y=ZP:{:t  
{ R2}kz.  
 RegisterHotkey(); %n05 Jitl  
} @up&q  
7 9Qc`3a  
BOOL CCaptureDlg::RegisterHotkey() ]}z'X!v_@  
{ I %|@3=Yc  
 UpdateData(); %cH8;5U40  
 UCHAR mask=0; |XKOXa3.  
 UCHAR key=0; 7_9+=. +X5  
 if(m_bControl) Hp btj  
  mask|=4; C-llq`(d  
 if(m_bAlt) 7hB#x]oQo  
  mask|=2; 59{;VY81  
 if(m_bShift) >u=%Lz"J  
  mask|=1; h6u2j p(+  
  key=Key_Table[m_Key.GetCurSel()]; q&zny2])  
 if(bRegistered){ J>`v.8y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Mv.Ciyc  
  bRegistered=FALSE; w4\BD&7V  
 } P<%v +O  
 cMask=mask; -xJX_6}A  
 cKey=key; iv:,fkwG  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {(rf/:X!p  
 return bRegistered; X*pZNz&E  
}  T/[f5?p  
SQ}S4r  
  四、小结 VmN}FMGN  
{7vgHutp  
  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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