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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: c~5#)AXMT  
  1.p?P] .  
  一、实现方法 pvI(hjMYPk  
Uf4QQ `c#  
  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: >u*woNw(XM  
d=oOMXYa   
#pragma data_seg("shareddata") I%e7:cs>  
HHOOK hHook =NULL; //钩子句柄 JV36@DVQ  
UINT nHookCount =0; //挂接的程序数目 c5;YKON  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 cuq7eMG6z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 at,Xad\j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey tPO.^  
static int KeyCount =0; ?9H7Twi+T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 **_VNDK+  
#pragma data_seg() |GdA0y\v*}  
+A~lPXAXW  
  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。 R:E6E@T  
<j:3<''o  
  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: XhWMvme  
v0"|J3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (pi7TSJ  
cKey,UCHAR cMask) {)4Vv`n  
{ F#X\}MvEU  
 BOOL bAdded=FALSE; L9Fx Lw41  
 for(int index=0;index<MAX_KEY;index++){ "'t<R}t!A  
  if(hCallWnd[index]==0){ u+I-!3J87  
   hCallWnd[index]=hWnd; {@Diig  
   HotKey[index]=cKey; :]y;t/   
   HotKeyMask[index]=cMask; Se0/ysVB  
   bAdded=TRUE; Ct}"o  
   KeyCount++; hf:n!+,C  
   break; &Ei dc .  
  } a(x[+ El  
 } aCGPtA'  
 return bAdded; _9!Ru!u~  
} Qi=rhN`  
//删除热键 M?[lpH3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JO :m: M  
{ 3C_g)5 _:  
 BOOL bRemoved=FALSE; )@R:$l86  
 for(int index=0;index<MAX_KEY;index++){ ^z[s;:-  
  if(hCallWnd[index]==hWnd){ \RQ5$!O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .8b 4  
    hCallWnd[index]=NULL; P2`ks[u+i  
    HotKey[index]=0;  %ef+Z  
    HotKeyMask[index]=0; Mh~T.;f.qq  
    bRemoved=TRUE; V9Au\  
    KeyCount--; >x2T '  
    break; wf|CE410  
   } !cSD9q*  
  } Vg:P@6s  
 } aj(M{gFq~  
 return bRemoved; )&_{m K  
} ZmmuP/~2K  
Tw!x*  
c}QQ8'_  
  DLL中的钩子函数如下: *\S>dhJ4  
{/Q pEd>3+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?a}eRA7  
{ (]7@0d88  
 BOOL bProcessed=FALSE; ,P auP~L  
 if(HC_ACTION==nCode) NA/+bgyuT>  
 { * +OAc `8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 XJ?@l3D:  
   switch(wParam) +Kf::[wP7  
   {  J,7_5V@jJ  
    case VK_MENU: h$ZF[Xbfe  
     MaskBits&=~ALTBIT; _^P>@ ^  
     break; 5+ fS$Q  
    case VK_CONTROL: Cs]xs9  
     MaskBits&=~CTRLBIT; 0 |F (qR  
     break; _ORW'(:Z  
    case VK_SHIFT: ^+GN8LUs  
     MaskBits&=~SHIFTBIT; ?7G[`@^Y  
     break; p%3';7W\  
    default: //judge the key and send message #(  kT  
     break; #e8CuS  
   }  K[?wP>s  
   for(int index=0;index<MAX_KEY;index++){ FfD2 &(-R  
    if(hCallWnd[index]==NULL) 29av8eW?3  
     continue; PY>j?otD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <m@U`RFm  
    { F&c A!~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :"QRB#EC%  
     bProcessed=TRUE; i^QcW!X&  
    } (qPZEZKx  
   } %+pXzw`B  
  } <78> 6u/W%  
  else if((lParam&0xc000ffff)==1){ //有键按下 k?S-peyRO  
   switch(wParam) )3G?5 OTS  
   { A@DIq/^xM  
    case VK_MENU: Qz$.t>@V=  
     MaskBits|=ALTBIT; ?C $_?Qi  
     break; J41ZQ  
    case VK_CONTROL: 2l\Oufer"  
     MaskBits|=CTRLBIT; S:1! )7  
     break; V).M\  
    case VK_SHIFT: .pdgRjlSn  
     MaskBits|=SHIFTBIT; ?^"S%Vb  
     break; E* lqCh  
    default: //judge the key and send message @l;f';+  
     break; O]~p)E  
   } x`o_&09;CG  
   for(int index=0;index<MAX_KEY;index++){ w6wXe_N+M  
    if(hCallWnd[index]==NULL) OKf/[hyu  
     continue; ol:_2G2xQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [n:R]|^a  
    { ]]7s9PCN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); fqF1 - %  
     bProcessed=TRUE; Y: byb68  
    } eA+6-'qN  
   } $hEX,  
  } Wo2M}]0  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 h[lh01z  
   for(int index=0;index<MAX_KEY;index++){ dvXu?F55  
    if(hCallWnd[index]==NULL) M~"K@g=Wr  
     continue; `q5*VqIhs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) HX=`kkX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _C*}14 "3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  z!F?#L5  
   } t;4{l`dk  
  } `[:f;2(@  
 }  Ng-3|N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Pd@?(WQ  
} HZP`u >.  
0#yo\McZ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Y)a 7osML  
@|cas|U.r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r-!8in2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ChBZGuO:  
XS1>ti|<  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: /sYD+*a  
U,+=>ns>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CF$^we  
{ y\@XW*_?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0<P -`|X  
 { y t<K!=7&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^ 5UIbA(  
  SaveBmp(); Qb SX'mx<  
  return FALSE; 4W1"=VL[g  
 } |\b*p:e l  
 …… //其它处理及默认处理 K(Cv9YQ  
} /[us;=CM  
*.i` hfRc  
nNL9B~d  
  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。 k'S/nF A  
&PGU%"rN  
  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。 g.,IQ4o  
,7/N=mz  
  二、编程步骤 M/#<=XhA  
EmH2 Dbw  
  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"; yCm iW %L4  
X#p E!mT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; OP>'<FK   
/gPn2e;  
  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; 3 D+dM0wM  
>S!QvyM(V  
  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; ^Ji5)c  
km8[azB o  
  5、 添加代码,编译运行程序。 +='.uc_  
j[c|np4k\  
三、程序代码 SFh6'v'1N@  
Z,Q)\W<'-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL R[Pyrs!H  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ymzlRs1^Ct  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ N.3M~0M*  
#if _MSC_VER > 1000 }9@ ,EEhg  
#pragma once *%Q!22?6F  
#endif // _MSC_VER > 1000 oU{m\r  
#ifndef __AFXWIN_H__ 2AU_<Hr6  
#error include 'stdafx.h' before including this file for PCH ^S[Mg6J  
#endif jMZ{>l.v  
#include "resource.h" // main symbols 4Kx;F 9!%~  
class CHookApp : public CWinApp wLNO\JP'  
{ !v94FkS>  
 public: b^FB[tZ\x  
  CHookApp(); :~g=n&x  
  // Overrides 0h$23.  
  // ClassWizard generated virtual function overrides mNs&*h}  
  //{{AFX_VIRTUAL(CHookApp) 7zy6`O P  
 public: bl:.D~@  
  virtual BOOL InitInstance(); jYuH zf  
  virtual int ExitInstance();  &grT}  
  //}}AFX_VIRTUAL H{9di\xnEm  
  //{{AFX_MSG(CHookApp) h*&-[nSo  
  // NOTE - the ClassWizard will add and remove member functions here. lB3W|-Ci  
  // DO NOT EDIT what you see in these blocks of generated code ! LiiQ;x  
  //}}AFX_MSG 347p2sK>  
  DECLARE_MESSAGE_MAP() #uFP eu:  
}; rr2|xL?+u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /1g_Uv;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >Ei_##  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4Yx?75/  
BOOL InitHotkey(); @R>J\>  
BOOL UnInit(); a B%DIH,  
#endif rT5dv3^MW!  
g)2}`}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #(!>  
#include "stdafx.h"  lcyan  
#include "hook.h" vMDV%E S1t  
#include <windowsx.h> <+pwGKtD  
#ifdef _DEBUG pT.iQ J|  
#define new DEBUG_NEW c`AtK s)u  
#undef THIS_FILE WOR~tS  
static char THIS_FILE[] = __FILE__; G' Jsk4:c  
#endif Al6)$8]e   
#define MAX_KEY 100 oJ>]=^?k  
#define CTRLBIT 0x04 k)dLJ<EM  
#define ALTBIT 0x02 OZs^c2 W  
#define SHIFTBIT 0x01 1Y\g{A "  
#pragma data_seg("shareddata") kC0F@'D  
HHOOK hHook =NULL; )"wWV{k  
UINT nHookCount =0; -+-@Yq$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^6oz3+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Mb uD8B  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey XeKIue@_  
static int KeyCount =0; HTvA]-AuM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8( 7DW |\  
#pragma data_seg() +P81&CaY  
HINSTANCE hins; U"af3c^2  
void VerifyWindow(); 9JpPas$]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $9j\sZj&  
//{{AFX_MSG_MAP(CHookApp) ; Sq_DP1W  
// NOTE - the ClassWizard will add and remove mapping macros here. &}Cm9V  
// DO NOT EDIT what you see in these blocks of generated code! pQ!NhzQ  
//}}AFX_MSG_MAP [n44;  
END_MESSAGE_MAP() xP "7B9B  
>@rsh-Z  
CHookApp::CHookApp() c54oQ1Q&"  
{ j0~]o})@i  
 // TODO: add construction code here, L "P$LEk  
 // Place all significant initialization in InitInstance SBg BZm}%  
} 3g`uLA X>u  
:q<8:,rP  
CHookApp theApp; 00[Uk'Q*5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lqTTTk  
{ y}FTLX $  
 BOOL bProcessed=FALSE; tQ&.;{5[f  
 if(HC_ACTION==nCode) LaG./+IP  
 { pMe'fC~*  
  if((lParam&0xc0000000)==0xc0000000){// Key up NVAt-u0LB  
   switch(wParam) yL7D;<!S&  
   { u`O xY  
    case VK_MENU: P=OHiG\z  
     MaskBits&=~ALTBIT; q okgu$2  
     break; L Me{5H  
    case VK_CONTROL: z}&?^YU*)`  
     MaskBits&=~CTRLBIT; D4$;jz,,  
     break; ?<STt 9  
    case VK_SHIFT: 4#1[i|:M  
     MaskBits&=~SHIFTBIT; MuQyHEDF  
     break; uckag/tv  
    default: //judge the key and send message yF8 av=<{  
     break; ?~Fk_#jz,@  
   } 6-c3v  
   for(int index=0;index<MAX_KEY;index++){ }K!}6?17T  
    if(hCallWnd[index]==NULL) p'M5]G  
     continue; [#.E=s+&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m-dyvW+  
    { XXBN Nr_CK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^$}9 Enj+Y  
     bProcessed=TRUE; 6sJN@dFA  
    } FctqE/>}I  
   } J\^ZRu_K  
  } <C`qJP-  
  else if((lParam&0xc000ffff)==1){ //Key down ,]+P#eXgE  
   switch(wParam) cah1'Y  
   { ^mz&L|h  
    case VK_MENU: mEyJ o|  
     MaskBits|=ALTBIT; ]3u ErnI  
     break; c=p`5sN)  
    case VK_CONTROL: ,u8)g; 8s  
     MaskBits|=CTRLBIT; G1=GzAd$5  
     break; $T.we+u  
    case VK_SHIFT: <csz4tL}P  
     MaskBits|=SHIFTBIT; BU(:6  
     break; xb1 i{d  
    default: //judge the key and send message >~8;H x].d  
     break; ;[V_w/-u  
   } _w0t+=&  
   for(int index=0;index<MAX_KEY;index++) ^1^k<  
   { :L*"OT7(6  
    if(hCallWnd[index]==NULL) #Drs=7w  
     continue; ,5$V;|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,K'>s<}  
    { SR7$m<0t*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0*^ J;QGE  
     bProcessed=TRUE; i`U:uwW`  
    } 1BO$xq  
   } EhL 8rR  
  } /`McKYIP  
  if(!bProcessed){ K<TVp;N  
   for(int index=0;index<MAX_KEY;index++){ WDQtj$e+  
    if(hCallWnd[index]==NULL) G5a PjP  
     continue; (ZH5/VKp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |:BKexjHL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Fr_esx  
   } 5G"LuA  
  } +RW P;rk  
 } o=@ 0Bd8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *5?a% p  
} RZ 4xR  
{G$I|<MD2T  
BOOL InitHotkey() ChO?Lm$y  
{ uTTM%-DMHT  
 if(hHook!=NULL){ })RT2zw}  
  nHookCount++; 1henQiIO  
  return TRUE; 8s(?zK\  
 } q_S`@2Dzz,  
 else S81Z\=eK  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ww-%s9N<  
  if(hHook!=NULL) #2l6'gWE0  
   nHookCount++; Fb#.Gg9b>  
  return (hHook!=NULL); =%P'?(o|  
} acr@erk  
BOOL UnInit() E]$YM5  
{ Jf6u E?.  
 if(nHookCount>1){ .#0),JJZ[  
  nHookCount--; FYq]-k{\  
  return TRUE; 9ZFvN*Zf'  
 } 7fRL'I#[@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KzD5>Xf]4$  
 if(unhooked==TRUE){ o (fZZ`6Y  
  nHookCount=0; g-lF{Z  
  hHook=NULL; 5y-8_)y8o  
 } -wv5c  
 return unhooked; 7.g)_W{7}  
} X{KWBk.1  
? g9mDe;k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dayp1%d  
{ 6Q S[mWU  
 BOOL bAdded=FALSE; !9|)v7}  
 for(int index=0;index<MAX_KEY;index++){ *: )hoHp&  
  if(hCallWnd[index]==0){ 94C)63V  
   hCallWnd[index]=hWnd; B~z P!^m  
   HotKey[index]=cKey; oEPO0O  
   HotKeyMask[index]=cMask; %SORs(4  
   bAdded=TRUE; )#ze  
   KeyCount++; 3S='/^l  
   break; M7z>ugk"  
  } CY2DxP%  
 } eBiP\  
 return bAdded; l*]9   
} /LMb~Hy,  
0_b7*\xc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9Br2}!Ny  
{ Cw;&{jY  
 BOOL bRemoved=FALSE; 8qwc]f$.w  
 for(int index=0;index<MAX_KEY;index++){ eveGCV;@  
  if(hCallWnd[index]==hWnd){ b(&~f@% |  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _|%pe]St  
    hCallWnd[index]=NULL; V# Mw  
    HotKey[index]=0; [P#^nyOh(  
    HotKeyMask[index]=0; N_S>%Z+  
    bRemoved=TRUE; LL3RC6;e  
    KeyCount--; 7+] T}4;  
    break; T3 xr Ua&  
   } ;-84cpfu  
  } N,v4SIC@  
 } *;A I0  
 return bRemoved; ,])@?TJb@  
} J]uYXsC  
A6w/X`([O  
void VerifyWindow() ~:7AHK2  
{ L8-  
 for(int i=0;i<MAX_KEY;i++){ _nu %`?Va  
  if(hCallWnd!=NULL){ E.W7`zl  
   if(!IsWindow(hCallWnd)){ tV2SX7N  
    hCallWnd=NULL;  v|+}>g  
    HotKey=0; VuTH"br6  
    HotKeyMask=0; tm\ <w H  
    KeyCount--; W"9iFj X  
   } N{n}]Js1D-  
  } 'Rk~bAX  
 } i[FcY2  
} :&$4&\_F  
Bm%.f!`  
BOOL CHookApp::InitInstance() Q"c!%`\  
{ -eAo3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FxOhF03\=[  
 hins=AfxGetInstanceHandle(); Bu?"b=B*  
 InitHotkey(); DJgk"'  
 return CWinApp::InitInstance(); #$V`%2>  
} =QEg~sD^)s  
N>i1TM2  
int CHookApp::ExitInstance() aM'0O![d  
{ ,-u | l  
 VerifyWindow(); 'R6D+Vk/  
 UnInit(); @'[w7HsJ  
 return CWinApp::ExitInstance(); WH :+HNl1d  
} L;.6j*E*  
}{/4sll  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AEkgm^t.{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) g#FqjE|mx  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ J)(H-xvV  
#if _MSC_VER > 1000 &rj6<b1A  
#pragma once &B3Eq 1A  
#endif // _MSC_VER > 1000 {y0*cC  
z.23i^Q  
class CCaptureDlg : public CDialog xXO& -v{  
{ dtjaQsJM^  
 // Construction xD#PM |I  
 public: BXueOvO8  
  BOOL bTray; A`u04Lm7  
  BOOL bRegistered; ;}IF'ANA  
  BOOL RegisterHotkey(); L]0+ u\(  
  UCHAR cKey; IDBhhv3ak  
  UCHAR cMask; W#'c6Hq2c  
  void DeleteIcon(); 7-Rn{"5  
  void AddIcon(); (omdmT%D  
  UINT nCount; r5[om$|*  
  void SaveBmp(); "%ag^v9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L.(T"`-i  
  // Dialog Data aq"E@fb  
  //{{AFX_DATA(CCaptureDlg) 18w[T=7)  
  enum { IDD = IDD_CAPTURE_DIALOG }; Zx25H"5j  
  CComboBox m_Key; Faa:h#  
  BOOL m_bControl; mh44  
  BOOL m_bAlt; d%9I*Qo0,  
  BOOL m_bShift; 3hR7 . /  
  CString m_Path; Bt,qG1>$-  
  CString m_Number; #c4LdZu9  
  //}}AFX_DATA ;3\F b3d  
  // ClassWizard generated virtual function overrides Szi4M&!K  
  //{{AFX_VIRTUAL(CCaptureDlg) IgEg  
 public: 5WP[-J)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;~z>GJox  
 protected: Ndi'b_Sh\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KtY~Y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _wM[U`H}s  
  //}}AFX_VIRTUAL P,h@F+OZN  
  // Implementation _ %&"4bm.  
 protected: 05*_h0}  
  HICON m_hIcon; 'DsfKR^ s  
  // Generated message map functions &0f7>.y  
  //{{AFX_MSG(CCaptureDlg) 2bX!-h  
  virtual BOOL OnInitDialog(); mUr@w*kq|p  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I>/`W  
  afx_msg void OnPaint(); O~d!* A  
  afx_msg HCURSOR OnQueryDragIcon(); psRm*,*O  
  virtual void OnCancel(); y5a^xRDw  
  afx_msg void OnAbout(); EN.yU!N.4  
  afx_msg void OnBrowse(); <!X'- >i%q  
  afx_msg void OnChange(); HAo8]?J  
 //}}AFX_MSG U'-MMwE]  
 DECLARE_MESSAGE_MAP() ThWZ>hyJ  
}; ?O4Dhu  
#endif DJ} xD&G  
xx;'WL,g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6z%3l7#7Yi  
#include "stdafx.h" :;0?;dpO  
#include "Capture.h" Vu`dEv L?  
#include "CaptureDlg.h" nS?HH6H  
#include <windowsx.h> |BH, H  
#pragma comment(lib,"hook.lib") k`)LO`))  
#ifdef _DEBUG l0D.7>aj  
#define new DEBUG_NEW >4M_jC.  
#undef THIS_FILE  4EB$e?  
static char THIS_FILE[] = __FILE__; (~Zg\(5#  
#endif EUuMSDp  
#define IDM_SHELL WM_USER+1 Zy*}C,Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3{MIBMA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3=bzIU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ' 1P_*  
class CAboutDlg : public CDialog I4|p;\`fK  
{ ie.cTTOI  
 public: gK)B3dH*&  
  CAboutDlg();  vA`[#(C  
  // Dialog Data 5tq$SF42X  
  //{{AFX_DATA(CAboutDlg) fil6w</L  
  enum { IDD = IDD_ABOUTBOX }; 73}k[e7e  
  //}}AFX_DATA T>f-b3dk  
  // ClassWizard generated virtual function overrides )STt3.  
  //{{AFX_VIRTUAL(CAboutDlg) "6KOql3  
 protected: Cc Ni8Wg_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DvOg|XUU0  
  //}}AFX_VIRTUAL njUM>E,'  
  // Implementation {z F  
 protected: I}:>M!w  
  //{{AFX_MSG(CAboutDlg) RB &s$6A  
  //}}AFX_MSG _IlL'c5  
  DECLARE_MESSAGE_MAP() (OG@]|-  
}; /-|xxy  
3&' STPpW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1~7y]d?%  
{ G$@X>)2N8  
 //{{AFX_DATA_INIT(CAboutDlg)  iI ^{OD  
 //}}AFX_DATA_INIT (/*-M]>  
} _4E+7+  
J.?p?-"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ae!_u \$  
{ _l8oB)  
 CDialog::DoDataExchange(pDX); H~V=TEj  
 //{{AFX_DATA_MAP(CAboutDlg) !Aw.f!  
 //}}AFX_DATA_MAP K4R jGSaF  
} ;( 2uQ#Y  
?q,x?`|(8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) WLh_b)V|  
 //{{AFX_MSG_MAP(CAboutDlg) LoCxoAg  
 // No message handlers n,HWVo>([  
 //}}AFX_MSG_MAP ~{NDtB)  
END_MESSAGE_MAP() ` jUn  
>LLzG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \pPq ]k  
: CDialog(CCaptureDlg::IDD, pParent) T2(+HI2  
{ EvECA,!i  
 //{{AFX_DATA_INIT(CCaptureDlg) y4?>5{`W  
  m_bControl = FALSE; R,^FJ  
  m_bAlt = FALSE; ?5GjH~  
  m_bShift = FALSE; *@BBlkcx  
  m_Path = _T("c:\\"); *v5y]E%aW  
  m_Number = _T("0 picture captured."); a9qZI  
  nCount=0; F H%yyT  
  bRegistered=FALSE; _%L3?PpF"  
  bTray=FALSE; f Fz8m  
 //}}AFX_DATA_INIT jcG4h/A  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7olA@;$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); DHJnz>bE  
} Z$hxo )|  
U)l>#gf8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  /KV@Ce\  
{ U NAuF8>K  
 CDialog::DoDataExchange(pDX); ?t%5/  
 //{{AFX_DATA_MAP(CCaptureDlg) <kM%z{p  
  DDX_Control(pDX, IDC_KEY, m_Key); ePY K^D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~ ZDdzp>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q@j:b]Y9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q{5Vq_s\  
  DDX_Text(pDX, IDC_PATH, m_Path); oDP|>yXC)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }`g*pp*  
 //}}AFX_DATA_MAP Anm5Cvt;i  
} Ux<h` s  
~g,QwaA[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T(}da**X  
//{{AFX_MSG_MAP(CCaptureDlg) $fn^i.  
 ON_WM_SYSCOMMAND() 4C[gW  
 ON_WM_PAINT() AP~!YwLW  
 ON_WM_QUERYDRAGICON() pKJ[e@E^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) SwL\=nq+~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v m$v[  
 ON_BN_CLICKED(ID_CHANGE, OnChange) zld>o3K}  
//}}AFX_MSG_MAP rLXn35O  
END_MESSAGE_MAP() wvYxL c#p0  
Bl1I "B  
BOOL CCaptureDlg::OnInitDialog() * K7L5.  
{ (l^lS=x  
 CDialog::OnInitDialog(); :Oj+Tc9A  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u,]yd*  
 ASSERT(IDM_ABOUTBOX < 0xF000); df)1} /*L  
 CMenu* pSysMenu = GetSystemMenu(FALSE); BA5= D>T-  
 if (pSysMenu != NULL) KWYG\#S0]  
 { rTJWftH!  
  CString strAboutMenu; V cL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); eyG.XAP  
  if (!strAboutMenu.IsEmpty()) d^Wh-U  
  { bpILiC  
   pSysMenu->AppendMenu(MF_SEPARATOR); N?Z?g_a8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); . =5Jpo  
  } iUKj:q:  
 } YsDl2P  
 SetIcon(m_hIcon, TRUE); // Set big icon sg y  
 SetIcon(m_hIcon, FALSE); // Set small icon kO#`m ]  
 m_Key.SetCurSel(0); )}aF=%  
 RegisterHotkey(); zhe5i;M  
 CMenu* pMenu=GetSystemMenu(FALSE); -I*A  `M  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); PLyu1{1" z  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _aGdC8%[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2n=;"33%a  
 return TRUE; // return TRUE unless you set the focus to a control {V&7JZl,/  
} c%dy$mkqgK  
[4t KJ+v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y>%NuL|s  
{ ;0 *^98K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) !RD,:\5V  
 { D^~g q`/)  
  CAboutDlg dlgAbout; h.^DRR^S  
  dlgAbout.DoModal(); mc=*wr$  
 } nX S%>1o,  
 else 525 >=h  
 { pSP_cYa#(#  
  CDialog::OnSysCommand(nID, lParam); vB{b/xmah  
 } ?uN(" I  
} )-{~7@yqZ  
._3NqE;  
void CCaptureDlg::OnPaint() .R'i=D`Pz  
{ kA_ 3o)J  
 if (IsIconic()) yM2&cMHH~  
 { l_%~X 9"  
  CPaintDC dc(this); // device context for painting l.juys8s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 85 hYYB0v  
  // Center icon in client rectangle THp `!l  
  int cxIcon = GetSystemMetrics(SM_CXICON); v\eBL&WK  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8iNAs#s  
  CRect rect; \2,18E  
  GetClientRect(&rect); (AYS>8O&  
  int x = (rect.Width() - cxIcon + 1) / 2; 1sjn_fPz  
  int y = (rect.Height() - cyIcon + 1) / 2; ihWz/qx&q  
  // Draw the icon  R'/wOE2  
  dc.DrawIcon(x, y, m_hIcon); %},gE[N!J  
 } *PEuaRDN  
 else pYG,5+g  
 { 4:']'E  
  CDialog::OnPaint(); xNkY'4%  
 } (0Cszm.  
} m =}X$QF`^  
~'MWtDe:Z8  
HCURSOR CCaptureDlg::OnQueryDragIcon() uH[0kh  
{ OpLSjr  
 return (HCURSOR) m_hIcon; l'T0<  
} p#d UL9  
f zO8by  
void CCaptureDlg::OnCancel() -#6*T,f0P(  
{ zf~zYZSr  
 if(bTray) t] wM_]+  
  DeleteIcon(); m-RY{DO+  
  CDialog::OnCancel(); [u80-x<  
} (do=o&9p m  
o3qv945  
void CCaptureDlg::OnAbout() D3xaR   
{ CE,O m^  
 CAboutDlg dlg; PNgMLQI6  
 dlg.DoModal(); fJ2{w[ne  
} e9_+$Oo  
6sl<Z=E#  
void CCaptureDlg::OnBrowse() >EtP^Lu~f_  
{ HW72 6K*  
 CString str; U_'q-*W  
 BROWSEINFO bi; 7V (7JV<>  
 char name[MAX_PATH]; =bWq 3aP)P  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e0HP~&BRs  
 bi.hwndOwner=GetSafeHwnd(); &o@5%Rz2/  
 bi.pszDisplayName=name; k+$4?/A  
 bi.lpszTitle="Select folder"; PAV2w_X~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; I%919  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3 ?F@jEQk  
 if(idl==NULL) 03WRj+w  
  return; q&Wwt qc9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !h>$bm  
 str.ReleaseBuffer(); TSSt@xQ+  
 m_Path=str; R"gm]SQ/  
 if(str.GetAt(str.GetLength()-1)!='\\') /'6[*]IZP  
  m_Path+="\\"; \)ZX4rs{8  
 UpdateData(FALSE); \C#b@xLnX  
} 5,BkwAr+6[  
T1HiHvJ  
void CCaptureDlg::SaveBmp() Xl6ZV,1=n7  
{ )]> '7] i  
 CDC dc; b^DV9mO4J  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BJxm W's/  
 CBitmap bm; &W+G{W{3  
 int Width=GetSystemMetrics(SM_CXSCREEN); V C'-h~  
 int Height=GetSystemMetrics(SM_CYSCREEN); !a(qqZ|s  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zl 0^EltiU  
 CDC tdc; ;n{j,HB  
 tdc.CreateCompatibleDC(&dc); s4`*0_n  
 CBitmap*pOld=tdc.SelectObject(&bm); |/=p  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q EGanpz  
 tdc.SelectObject(pOld); -^Km}9g  
 BITMAP btm; ?>jArzI  
 bm.GetBitmap(&btm); H0 n@kKr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; W?J*9XQ`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2G5!u)  
 BITMAPINFOHEADER bih; ku9F N  
 bih.biBitCount=btm.bmBitsPixel; rbun5&RCyW  
 bih.biClrImportant=0; gc7:Rb^E5t  
 bih.biClrUsed=0; Z?v6pjZ?  
 bih.biCompression=0; "rDzrz  
 bih.biHeight=btm.bmHeight; }_:#fE  
 bih.biPlanes=1; =tRe3o0(  
 bih.biSize=sizeof(BITMAPINFOHEADER); lEb R)B,  
 bih.biSizeImage=size; ilcy/  
 bih.biWidth=btm.bmWidth; ajW$d!  
 bih.biXPelsPerMeter=0; i^cM@?  
 bih.biYPelsPerMeter=0; [-Tt11  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %802H%+  
 static int filecount=0; YZ:'8<  
 CString name; |DPpp/  
 name.Format("pict%04d.bmp",filecount++); )7"DR+;:  
 name=m_Path+name; 2]RH)W86;  
 BITMAPFILEHEADER bfh; I cA\3j  
 bfh.bfReserved1=bfh.bfReserved2=0; r]//Q6|S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nBIv{  
 bfh.bfSize=54+size; $CwTNm?  
 bfh.bfOffBits=54; UH,4b`b  
 CFile bf; +fCyR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .'{6u;8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ID).*@(I"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _ KhEwd  
  bf.WriteHuge(lpData,size); 'j<:FUDJ  
  bf.Close(); 2N8sq(LK{  
  nCount++; ^@LhUs>3  
 } )tI2?YIR  
 GlobalFreePtr(lpData); JvWs/AG1  
 if(nCount==1) {S"  
  m_Number.Format("%d picture captured.",nCount); 9EA !j}  
 else 8j+:s\  
  m_Number.Format("%d pictures captured.",nCount); \ [^) WQ  
  UpdateData(FALSE); 0CVsDVA  
} \%?8jQ'tX  
t"bPKFRy9E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lp0T\ %  
{ ]7R&m)16  
 if(pMsg -> message == WM_KEYDOWN) yH"$t/cU"R  
 { i&'^9"Z)O  
  if(pMsg -> wParam == VK_ESCAPE) e5>5/l]jsg  
   return TRUE; v6DxxE2n  
  if(pMsg -> wParam == VK_RETURN) )"c]FI[}  
   return TRUE; C|~JPcl  
 } "K$Wh1<7  
 return CDialog::PreTranslateMessage(pMsg); VRQbf  
} B/9<b{6  
JU=\]E@8c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5) n:<U*  
{ {Fp`l\,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z2nUul(2  
  SaveBmp(); yc%E$g  
  return FALSE; !%RJC,X  
} #9hXZr/8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x [{q&N!"`  
 CMenu pop; vu'!-K=0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SL\y\G aV  
 CMenu*pMenu=pop.GetSubMenu(0); ?ZuD _L-i  
 pMenu->SetDefaultItem(ID_EXITICON); HHIUl,P  
 CPoint pt; 23\j1?  
 GetCursorPos(&pt); 77&^$JpM  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 400Tw`AiJ  
 if(id==ID_EXITICON) G0; EbJ/&  
  DeleteIcon(); WP@JrnxO\`  
 else if(id==ID_EXIT) < ;,S"e  
  OnCancel(); Th;gps%b  
 return FALSE; Z/6'kE{l  
} K'{W9~9Lq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LnI{S{]wDh  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~q]|pD"\K|  
 AddIcon(); :a f;yu  
 return res; "U5Ln2X{J  
} hNq8 uyKx  
5Ckk5b  
void CCaptureDlg::AddIcon() 4z0R\tjT  
{ N9JgV,`  
 NOTIFYICONDATA data; Xx y Bg!R  
 data.cbSize=sizeof(NOTIFYICONDATA); & L.PU@  
 CString tip; _^xh1=Qr}n  
 tip.LoadString(IDS_ICONTIP); |p8"9jN@}c  
 data.hIcon=GetIcon(0); {sfmWVp  
 data.hWnd=GetSafeHwnd(); il>x!)?o  
 strcpy(data.szTip,tip); nzE,F\k  
 data.uCallbackMessage=IDM_SHELL; v1"g!%U6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ghJ,s|lH  
 data.uID=98; 9?l?G GmQ  
 Shell_NotifyIcon(NIM_ADD,&data); (4{ C7  
 ShowWindow(SW_HIDE); srChY&h?<  
 bTray=TRUE; ll<9f)  
} z7t'6Fy9'  
;oY(I7  
void CCaptureDlg::DeleteIcon() s7UhC.>'@  
{ JJ N(M*;  
 NOTIFYICONDATA data; e1 {t0f  
 data.cbSize=sizeof(NOTIFYICONDATA); B~_,>WG  
 data.hWnd=GetSafeHwnd(); cpF1XpvT  
 data.uID=98; -|k&L}\OB0  
 Shell_NotifyIcon(NIM_DELETE,&data); S4{Mu(^xT  
 ShowWindow(SW_SHOW); %];h|[ax]  
 SetForegroundWindow(); 1 ~B<  
 ShowWindow(SW_SHOWNORMAL); ;1R?9JN"  
 bTray=FALSE; X8,7_D$  
} %g]$Vfpy  
?LV-W  
void CCaptureDlg::OnChange() _/N'I7g  
{ 0x>/6 <<  
 RegisterHotkey(); V$-~%7@>;9  
} 1|l)gfcP  
VT5cxB<  
BOOL CCaptureDlg::RegisterHotkey() <>T&ab@dE(  
{ =;k+g?.@I  
 UpdateData(); ni"$[8U  
 UCHAR mask=0; tkdBlG]!  
 UCHAR key=0; k binf  
 if(m_bControl) :p\(y  
  mask|=4;  zU4V^N'  
 if(m_bAlt) Hn#GS9d_?  
  mask|=2; "J8;4p  
 if(m_bShift) ;Txv -lfS  
  mask|=1; u6iU[5  
  key=Key_Table[m_Key.GetCurSel()]; 56bud3CVs  
 if(bRegistered){ EZ%w=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *793H\  
  bRegistered=FALSE; T]Tdx.B  
 } ,N@Yk.  
 cMask=mask; x!"SD3r=4>  
 cKey=key; Bg 7j5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L= :d!UF  
 return bRegistered; =.qm8+  
} $KwI}>E4  
w PG1P'w;  
  四、小结 LL= Z$U $  
?u_gXz;A  
  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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