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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: WJ=DTON  
  Z.Lm[$/edn  
  一、实现方法 1RM;"b/  
vA@Kb3 ,  
  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: _/bFt6  
]2(vO0~  
#pragma data_seg("shareddata") _ vVw2HH  
HHOOK hHook =NULL; //钩子句柄 rGuhYYvK  
UINT nHookCount =0; //挂接的程序数目 []:;8fY  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $T{,3;kt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3#huC=zbf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey x?Z)q4  
static int KeyCount =0; 9;2PoW8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 LO]D XW 9  
#pragma data_seg() '$pT:4EuGq  
J_YbeZ]  
  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。 fx %Y(W#5  
@*q WV*$h  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: .o91^jt  
mbxJS_P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR s<gZB:~  
cKey,UCHAR cMask) 1}#v<b$  
{ @?iLz7SPk  
 BOOL bAdded=FALSE; P7QOlTQI  
 for(int index=0;index<MAX_KEY;index++){ n={} ='  
  if(hCallWnd[index]==0){ \kcJF'JFA0  
   hCallWnd[index]=hWnd; z_R^n#A~r  
   HotKey[index]=cKey; JL $6Fw;  
   HotKeyMask[index]=cMask;  \o !  
   bAdded=TRUE; ozH7c_ <  
   KeyCount++; R5 47  
   break; k%E9r'Ac  
  } B 3|zR  
 } 21D4O,yCe  
 return bAdded; }HtP8F8!x  
} w{k8Y?  
//删除热键 5,`U3na,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EJ{Z0R{{  
{ Ze ~$by|9f  
 BOOL bRemoved=FALSE; j*f%<`2`j  
 for(int index=0;index<MAX_KEY;index++){ 5w"f.d'  
  if(hCallWnd[index]==hWnd){ :kh l}|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )V~Fl$A  
    hCallWnd[index]=NULL; .z&V!2zp  
    HotKey[index]=0; m76**X  
    HotKeyMask[index]=0; 6g4CUP'Y  
    bRemoved=TRUE; q9o =,[  
    KeyCount--; {6Lkh  
    break; [:sPZ{  
   } L>+g;GJ  
  } rt$z&#M  
 } pq_DYG]  
 return bRemoved; ~K%]9  
} $l-|abLELz  
mE)65@3%  
%Q5D#d"p`  
  DLL中的钩子函数如下: uXq?Z@af|f  
{`QF(WL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^Dhj<_  
{ o^dt# &  
 BOOL bProcessed=FALSE; `q* 0^}  
 if(HC_ACTION==nCode) 7iu?Q  
 { W!q 'wrIx(  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;e;lPM{+  
   switch(wParam) *- $u\?$  
   {  /]%,C   
    case VK_MENU: u^a\02aV[  
     MaskBits&=~ALTBIT; ya5a7  
     break; #3u3WTk+  
    case VK_CONTROL: & tQHxiDX  
     MaskBits&=~CTRLBIT; .B*Yg<j  
     break; hu~02v5  
    case VK_SHIFT: EquNg@25W  
     MaskBits&=~SHIFTBIT; {%D!~,4Ht  
     break; `%AFKmc^;  
    default: //judge the key and send message |57KTiiNLI  
     break; /{YUM~  
   } >0)E\_ u  
   for(int index=0;index<MAX_KEY;index++){ @v_E' 9QG^  
    if(hCallWnd[index]==NULL) w8:F^{  
     continue; 5~k-c Ua  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :}x\&]uC#k  
    { B[ae<V0 k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ht? u{\p@  
     bProcessed=TRUE; ONJW*!(  
    } X@Eq5s  
   } }`6-^lj  
  } ^k&zX!W  
  else if((lParam&0xc000ffff)==1){ //有键按下 I9*o[Jp5  
   switch(wParam)  z:9  
   { xou7j   
    case VK_MENU: Dntcv|%u  
     MaskBits|=ALTBIT; ]Vhhx`0  
     break; +JZ<9,4  
    case VK_CONTROL: G?\o_)IJ  
     MaskBits|=CTRLBIT; /b6Y~YbgU  
     break; eHK}U+"\  
    case VK_SHIFT: A}C&WT~  
     MaskBits|=SHIFTBIT; )<G>]IP<  
     break; d|TRP,y  
    default: //judge the key and send message seY0"ym&e  
     break; 2g-'.w  
   } Y?%MPaN:  
   for(int index=0;index<MAX_KEY;index++){ RBr  
    if(hCallWnd[index]==NULL) @dX0gHU[c  
     continue; U#G uB&V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _tL+39 u  
    { acB,u&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *{W5QEa  
     bProcessed=TRUE; I'"*#QOX  
    } ar+mj=m  
   } 9bgKu6-X  
  } C yC<{D+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 FMY r6/I  
   for(int index=0;index<MAX_KEY;index++){ oV ?tp4&  
    if(hCallWnd[index]==NULL) ~cSC-|$^&  
     continue; !Y=s_)X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o;FjpZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vq$%Ug/B  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \F,?ptu  
   } e;x`C  
  } GW'=/ z7  
 } 6v GcM3M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z QoMHFL3  
} Xfx(X4$9  
. )Fn]x"<  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: H:U1#bQQ:  
;G!X?(%+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); meR%);\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l1jS2O(  
X X{:$f+  
  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: r&}fn"H!  
l*_b)&CH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IaE};8a8  
{ )ty *_@N0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +<:p`%  
 { /.'1i4Xa1P  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \yb^%$hZ0  
  SaveBmp(); ~J)4(411  
  return FALSE; GY,@jp|R  
 } 0VoC|,$U  
 …… //其它处理及默认处理 F"hi2@/TI  
} [KWF7GQi  
)%;#~\A  
`]5XY8^kI  
  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。 {xEX_$nv  
wX#\\Jgi  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 U,iTURd  
g%j z,|  
  二、编程步骤 s`C#=l4  
f: 7Y  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ++,mM7a  
ZeWHSU  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Uo^s]H#:  
kKE 2~ q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; G2a fHL<  
Iay7Fkv  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; GD[~4G  
:KX/`   
  5、 添加代码,编译运行程序。 H=X>o.iVqi  
zF)_t S  
三、程序代码 Btpx[T  
NXeo&+F  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL TM!R[-\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Vz 5:73  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ m{%_5nW  
#if _MSC_VER > 1000 2:p2u1Q O  
#pragma once UeHS4cW  
#endif // _MSC_VER > 1000 lBQ|=  
#ifndef __AFXWIN_H__ 8H;TPa  
#error include 'stdafx.h' before including this file for PCH dUb(C1h  
#endif L8bq3Q'p  
#include "resource.h" // main symbols pKEMp&geo  
class CHookApp : public CWinApp nkhM1y  
{ \vQ_:-A  
 public: ;i:Uoyi  
  CHookApp(); BC@"WlD  
  // Overrides Crpk q/M  
  // ClassWizard generated virtual function overrides ::TUSz2/2  
  //{{AFX_VIRTUAL(CHookApp) bL0+v@(r  
 public: s ]QzNc  
  virtual BOOL InitInstance(); qh.c#t  
  virtual int ExitInstance(); J\;~(: ~  
  //}}AFX_VIRTUAL ACyQsmqm:  
  //{{AFX_MSG(CHookApp) r{%NMj  
  // NOTE - the ClassWizard will add and remove member functions here. !+>yCy$~_  
  // DO NOT EDIT what you see in these blocks of generated code ! -v jjcyTt  
  //}}AFX_MSG B]*&lRR  
  DECLARE_MESSAGE_MAP() +\:I3nKs%  
}; N`iK1n4 X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _R5^4-Qe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;F5B)&/B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,\=u(Y\I[  
BOOL InitHotkey(); <5$= Ta  
BOOL UnInit(); <NJ7mR}  
#endif L~mL9[(,  
Ce_Z &?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~MhPzu&B  
#include "stdafx.h" cz T@txF  
#include "hook.h" dk(-yv'  
#include <windowsx.h> }U^9(  
#ifdef _DEBUG Zfb:>J@h6  
#define new DEBUG_NEW (n`\b47  
#undef THIS_FILE #=O0-si ]P  
static char THIS_FILE[] = __FILE__; B;K{Vo:C  
#endif |(P>'fat-p  
#define MAX_KEY 100 e#zGLxa  
#define CTRLBIT 0x04 klch!m=d  
#define ALTBIT 0x02 J2 5>t^  
#define SHIFTBIT 0x01 jzPC9  
#pragma data_seg("shareddata") CJu;X[6  
HHOOK hHook =NULL; gdT^QM:y4$  
UINT nHookCount =0; x_@ev-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 10[~ki-1;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $C[YqZO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey a,j!B hu  
static int KeyCount =0; uWfse19  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U| N`X54  
#pragma data_seg() ]a:kP,  
HINSTANCE hins; a:;*"p[R  
void VerifyWindow(); L7jz^g^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) pt0H*quwI  
//{{AFX_MSG_MAP(CHookApp) ol[{1KT{  
// NOTE - the ClassWizard will add and remove mapping macros here. VX>_Sp s  
// DO NOT EDIT what you see in these blocks of generated code! yRgo1ow]  
//}}AFX_MSG_MAP h h8UKEM-  
END_MESSAGE_MAP() 17 j7j@s)  
\2+xMv)8  
CHookApp::CHookApp() r+lY9 l  
{ R]V`t^1  
 // TODO: add construction code here, jr9ZRHCU  
 // Place all significant initialization in InitInstance 72{kig9c  
} NK4ven7/  
`r]Cd {G  
CHookApp theApp; 2i>xJMW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T@RzY2tz  
{ 3oKqj>  
 BOOL bProcessed=FALSE; * e 8V4P  
 if(HC_ACTION==nCode) Fza)dJ 7  
 { @Td[rHl  
  if((lParam&0xc0000000)==0xc0000000){// Key up Maxnk3n  
   switch(wParam) 92VAQU6  
   { =}q4ked /  
    case VK_MENU: f0[xMn0Tu  
     MaskBits&=~ALTBIT; h:GOcLYM@X  
     break; 3] @<.  
    case VK_CONTROL: w_{z"VeD  
     MaskBits&=~CTRLBIT; 7}lZa~/  
     break; c:$:j,i}  
    case VK_SHIFT: .xk<7^ZD  
     MaskBits&=~SHIFTBIT; oVhw2pKpM  
     break; 4sJx_Qi  
    default: //judge the key and send message J%A`M\  
     break; \hq8/6=4s  
   } sZbzY^P  
   for(int index=0;index<MAX_KEY;index++){ wG|3 iFK  
    if(hCallWnd[index]==NULL) VAthQ<  
     continue; +<q^[<pS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B!N807  
    { lGM3?AN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); BT#>b@Xub  
     bProcessed=TRUE; JDhA{VN6  
    } j)]'kg  
   } KC]Jbm{y  
  } -s)2b ;  
  else if((lParam&0xc000ffff)==1){ //Key down lLJb3[ e.  
   switch(wParam) XWvs~Xw@  
   { 8bysg9H0  
    case VK_MENU: .o-j  
     MaskBits|=ALTBIT; Lhc@*_2  
     break; OcH- `A  
    case VK_CONTROL: UMX+h])#N  
     MaskBits|=CTRLBIT; vV'^HD^v  
     break; iwVra"y  
    case VK_SHIFT: K;97/"  
     MaskBits|=SHIFTBIT; hKT:@l*  
     break; JZY=2q&  
    default: //judge the key and send message p/5!a~1'xN  
     break; GS$k  
   } w|Mj8Lc+  
   for(int index=0;index<MAX_KEY;index++) e7?W VV,  
   { 1Efl|lV  
    if(hCallWnd[index]==NULL) "p; DQ-V  
     continue; .{;!bw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "''<:K|  
    { m0* B[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y5NbY02E  
     bProcessed=TRUE; b{ozt\:M  
    } ."^dJ |fN  
   } 2%<jYm#'z-  
  } }?~uAU-  
  if(!bProcessed){ ~^euaOFU 6  
   for(int index=0;index<MAX_KEY;index++){ Cei U2.:U  
    if(hCallWnd[index]==NULL) Dsua13 hF  
     continue; o"FX+ 17  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v\k,,sI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v-gT 3kJ  
   } r zmk-V  
  } 'H'+6   
 } h@~X*yLKh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e>>G4g  
} ICTtubjV"  
B5cyX*!?  
BOOL InitHotkey() [s34N+vU  
{ 0B4(t6o  
 if(hHook!=NULL){ wW<"l"x,  
  nHookCount++; <  t (Pw  
  return TRUE; ?|8Tgs@+  
 } q5!l(QL.  
 else n>0dz#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @r]s9~Lx9  
  if(hHook!=NULL) 48ma&f;  
   nHookCount++; 0oJ^a^|  
  return (hHook!=NULL); 7qUtsDK  
} nMa^Eq#  
BOOL UnInit() )[)]@e  
{ Yz,!#ob$  
 if(nHookCount>1){ G}-.xj]  
  nHookCount--; 4d 3Znpf  
  return TRUE; D{4hNO  
 } Uaj=}p\+.p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ntn md  
 if(unhooked==TRUE){ 4QN;o%,  
  nHookCount=0; D+)=bPMe  
  hHook=NULL; 0;h1LI)  
 } N.G*ii\  
 return unhooked; ^'fKey`  
} oGVSy`ku  
cO RMR!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :|M/+XPu  
{ \zI&n &T  
 BOOL bAdded=FALSE; DqMK[N,0  
 for(int index=0;index<MAX_KEY;index++){ Tb= {g;0 @  
  if(hCallWnd[index]==0){ M96( Rg  
   hCallWnd[index]=hWnd; 9i<-\w^$  
   HotKey[index]=cKey; _o?(t\B9{  
   HotKeyMask[index]=cMask; c9 uT`h  
   bAdded=TRUE; a-E-hX2  
   KeyCount++; w~U`+2a3  
   break; rc$!$~|I3Z  
  } mVK9NK  
 } v|I5Gz$qpa  
 return bAdded; ~8m>DSs)D  
} 1D[P\r-  
xN m32~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _0*>I1F~  
{ B -~&6D,  
 BOOL bRemoved=FALSE; -k <9v.:  
 for(int index=0;index<MAX_KEY;index++){ !ix<|F5  
  if(hCallWnd[index]==hWnd){ IOkC[([  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l>UUaf|O  
    hCallWnd[index]=NULL; GeaDaYh#T  
    HotKey[index]=0; (<3lo ZaX  
    HotKeyMask[index]=0; 1mJ_I|98  
    bRemoved=TRUE; uvDoo6'  
    KeyCount--; 1bJ]3\  
    break; ~snF20  
   } 7F(F.ut  
  } S9NN.dKu  
 } m_$I?F0  
 return bRemoved; +q j*P9  
} EOX_[ek7  
ZGpTw[5ql  
void VerifyWindow() @pG lWw9*  
{ uT}TSwgp  
 for(int i=0;i<MAX_KEY;i++){ b3b~T]]  
  if(hCallWnd!=NULL){ 6rQpK&Jx  
   if(!IsWindow(hCallWnd)){ }=hoATs  
    hCallWnd=NULL; +%Y c4  
    HotKey=0; mp,e9Nd;  
    HotKeyMask=0; N+M&d3H`  
    KeyCount--; n<:d%&^n  
   } vaRwh E:  
  } "'!%};  
 } Dw`m>'J0  
} 0O#B'Uu  
R==cz^#  
BOOL CHookApp::InitInstance() Ejms)JK+  
{ 0R}Sw[M.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >_`D3@Rz  
 hins=AfxGetInstanceHandle(); [DxefYyI  
 InitHotkey(); nheU~jb  
 return CWinApp::InitInstance(); M> jBm .  
} ls24ccOs  
o? i.v0@!K  
int CHookApp::ExitInstance() v] T(z L|  
{ 5 Y Q  
 VerifyWindow(); 1_NG+H]x9  
 UnInit(); lP*  
 return CWinApp::ExitInstance(); f5aF6FBH  
} D*cyFAF  
,xYsH+ybA  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DMQNr(w{!2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (~Uel1~@  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !(*a+ur&i  
#if _MSC_VER > 1000 Y#lk!#\Y  
#pragma once GwQZf|  
#endif // _MSC_VER > 1000 O<1vSav!K  
~zxwg+:QO  
class CCaptureDlg : public CDialog ``$%L=_m  
{ /> 3  
 // Construction KR=d"t Qw  
 public: 2]D$|M?$~  
  BOOL bTray; /c@*eU  
  BOOL bRegistered; =zm0w~']E!  
  BOOL RegisterHotkey(); 5e)6ua,  
  UCHAR cKey; ^m_^  
  UCHAR cMask; @0z0m;8  
  void DeleteIcon(); #P%1{l5m  
  void AddIcon(); WQ[}&kY~  
  UINT nCount; ,g/ _eROJ  
  void SaveBmp(); rX33s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f6B-~x<l  
  // Dialog Data UZje>. ~?  
  //{{AFX_DATA(CCaptureDlg) [0u.}c;(  
  enum { IDD = IDD_CAPTURE_DIALOG }; .Iw ur;/\  
  CComboBox m_Key; .?rbny  
  BOOL m_bControl; _ }E-~I>  
  BOOL m_bAlt; %j'G.*TD  
  BOOL m_bShift; #2Pr Gz]  
  CString m_Path; |rHG%VnBH  
  CString m_Number; u>}w-  
  //}}AFX_DATA U g}8y8  
  // ClassWizard generated virtual function overrides !/Iq{2LX  
  //{{AFX_VIRTUAL(CCaptureDlg) P +dA~2k  
 public: b4Z`y8=  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  R"U/RS  
 protected: &yx NvyA[u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zc'|!pT _  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /m `}f]u  
  //}}AFX_VIRTUAL s\'y-UITi1  
  // Implementation p)B33Z zC  
 protected: 6a4'xq7  
  HICON m_hIcon; *Y85DEA  
  // Generated message map functions )jyq{Jb  
  //{{AFX_MSG(CCaptureDlg) O^9CV*]!n  
  virtual BOOL OnInitDialog(); zL:&Q<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZV'$k\  
  afx_msg void OnPaint(); lWx  
  afx_msg HCURSOR OnQueryDragIcon(); *jk3 \KaoV  
  virtual void OnCancel(); &?.n2+T+ =  
  afx_msg void OnAbout(); v B h;  
  afx_msg void OnBrowse(); Go>wo/Sb  
  afx_msg void OnChange(); DR:8oo&E  
 //}}AFX_MSG fdlvn*H  
 DECLARE_MESSAGE_MAP() ]} 61vV  
}; q$r&4s)To  
#endif sl/=g   
z Yw;q3"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U;xu/xDRi  
#include "stdafx.h" Y^52~[w~  
#include "Capture.h" gNShOu  
#include "CaptureDlg.h" S4cpQq.  
#include <windowsx.h> `|$'g^eCL  
#pragma comment(lib,"hook.lib") {5^K Xj$B  
#ifdef _DEBUG \6{krn|  
#define new DEBUG_NEW qysTjGwa]  
#undef THIS_FILE iI5+P`sE&J  
static char THIS_FILE[] = __FILE__; f UC9-?(K  
#endif L0rip5[;d  
#define IDM_SHELL WM_USER+1 ;{vwBDV!'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lT8#bA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?4XnEDA m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %.mEBI=hs  
class CAboutDlg : public CDialog W'a(oI  
{ V=pMq?Nr  
 public: TG}d3ZU !  
  CAboutDlg(); Ju!(gh  
  // Dialog Data _7U]&Nh99  
  //{{AFX_DATA(CAboutDlg) X1+ wX`f  
  enum { IDD = IDD_ABOUTBOX }; J/2j;,8D  
  //}}AFX_DATA :Sr?6FPc  
  // ClassWizard generated virtual function overrides ~+yZfOcw  
  //{{AFX_VIRTUAL(CAboutDlg) _V@WNo%B  
 protected: xwRhs!`t1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5W/{h q8}}  
  //}}AFX_VIRTUAL -LtK8wl^  
  // Implementation m9in1RI%  
 protected: pkJ/oT  
  //{{AFX_MSG(CAboutDlg) 57wFf-P  
  //}}AFX_MSG { ;s;.  
  DECLARE_MESSAGE_MAP() AS)UJ/lC  
}; ,57$N&w  
=; 0wFwSz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !b8uLjd;  
{ YEv%C| l  
 //{{AFX_DATA_INIT(CAboutDlg) <$%X<sDkq  
 //}}AFX_DATA_INIT C|MQ $~5:w  
} EIjI!0j  
 MJ`N,E[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $9 +YNgW>  
{ &-%>q B|*  
 CDialog::DoDataExchange(pDX); A /(lKq  
 //{{AFX_DATA_MAP(CAboutDlg) e,>%Z@92(  
 //}}AFX_DATA_MAP bB!#:j>(v  
} 8) N@qUV  
a5@z:i  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >nzu],U  
 //{{AFX_MSG_MAP(CAboutDlg) UiH!Dl}<  
 // No message handlers oH^(qZ8W  
 //}}AFX_MSG_MAP %Y]=1BRk}  
END_MESSAGE_MAP() (D<(6?  
NQfYxB1Yr:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) O. ,3|  
: CDialog(CCaptureDlg::IDD, pParent) hfqqQ!,l!  
{  ~*M$O&  
 //{{AFX_DATA_INIT(CCaptureDlg) r> k-KdS  
  m_bControl = FALSE; u:&o}[  
  m_bAlt = FALSE; LCs__.  
  m_bShift = FALSE; [U>@,BH  
  m_Path = _T("c:\\"); .Obn&S  
  m_Number = _T("0 picture captured."); 9i5tVOhE  
  nCount=0; K{@3\5<  
  bRegistered=FALSE; N|mJg[j@7  
  bTray=FALSE; (hB?  
 //}}AFX_DATA_INIT "9IYB)Js  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (-0ePSOG  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %<"}y$J  
} 6sJw@Oa J  
?^i1_v7 Bi  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0V$k7H$Z  
{ k'T^dY&c  
 CDialog::DoDataExchange(pDX); :Zt2'vcGpf  
 //{{AFX_DATA_MAP(CCaptureDlg) +-<}+8G;  
  DDX_Control(pDX, IDC_KEY, m_Key); z0%\OhuCcf  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); iYJZvN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F(5hmr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); /P:.qtT(  
  DDX_Text(pDX, IDC_PATH, m_Path); -`b8T0?oK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `Out(Hn  
 //}}AFX_DATA_MAP IvHh4DU3Z  
} =-KMb`xT  
U!(@q!>G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E<E3&;qD  
//{{AFX_MSG_MAP(CCaptureDlg) HDVW0QaMu  
 ON_WM_SYSCOMMAND() Z(u5$<up  
 ON_WM_PAINT() ~YP Jez  
 ON_WM_QUERYDRAGICON() X(A.X:"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6"/WZmOp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ( #D*Pl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) i;z{zVR  
//}}AFX_MSG_MAP ~]HN9R^&  
END_MESSAGE_MAP() dq\FBwfe  
6at1bQ$  
BOOL CCaptureDlg::OnInitDialog() bWWXc[O2&(  
{ %FZ2xyI.  
 CDialog::OnInitDialog();  6e,xDr  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .IarkeCtb  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7O5`v(<9n>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5U`ZbG  
 if (pSysMenu != NULL) oF]cTAqhC.  
 { |re}6#TgcT  
  CString strAboutMenu; 2P#=a?~[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i;/xK=L  
  if (!strAboutMenu.IsEmpty()) g.py+ ZFJ  
  { [XVEBA4GI  
   pSysMenu->AppendMenu(MF_SEPARATOR); QaIjLc~W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Fd]\txOXj  
  } oA] KE"T  
 } $ _j[2EU  
 SetIcon(m_hIcon, TRUE); // Set big icon h4|i%,f  
 SetIcon(m_hIcon, FALSE); // Set small icon NLS"eD m  
 m_Key.SetCurSel(0); x5}'7,A  
 RegisterHotkey(); v+ 7kU=  
 CMenu* pMenu=GetSystemMenu(FALSE); #:jb*d?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {\H/y c|@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 54lu2gD'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mw$r$C{  
 return TRUE; // return TRUE unless you set the focus to a control aNcd` $0  
} S$TmZk=  
fyTAou6hI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) , DdB^Ig<r  
{ E 99hlY~1:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $YxBE`)d-  
 { (*}yjUYLZ  
  CAboutDlg dlgAbout; S$)*&46g  
  dlgAbout.DoModal(); ^G&3sF}  
 } ^d}gpin  
 else }KUd7[s  
 { GSclK|#t E  
  CDialog::OnSysCommand(nID, lParam); q6Rr.A  
 } q<y#pL=k"*  
} o[oM8o<  
m!<i0thJ  
void CCaptureDlg::OnPaint() m>USD? i  
{ >~%e$a7}+  
 if (IsIconic()) +#U|skl  
 { dr)YzOvba  
  CPaintDC dc(this); // device context for painting 6+r$t#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Zl 9aDg  
  // Center icon in client rectangle pl@O N"=[  
  int cxIcon = GetSystemMetrics(SM_CXICON); NBl+_/2'w  
  int cyIcon = GetSystemMetrics(SM_CYICON); )?+$x[f!*  
  CRect rect; P-F)%T[  
  GetClientRect(&rect); W} WI; cI  
  int x = (rect.Width() - cxIcon + 1) / 2; A.<H>=Z# O  
  int y = (rect.Height() - cyIcon + 1) / 2; H]Hv;fcC  
  // Draw the icon fjvN$NgVs  
  dc.DrawIcon(x, y, m_hIcon); r/pH_@  
 } Grs]d-xI  
 else mxor1P#|  
 { x{D yTtX<  
  CDialog::OnPaint(); QaUm1 i#  
 } ? WJ> p  
} ^` un'5Vk  
w=b)({`M  
HCURSOR CCaptureDlg::OnQueryDragIcon() XE^)VLH:  
{  _zlqtO  
 return (HCURSOR) m_hIcon; 3bO(?l`3h  
} BA\/YW @  
u]}s)SmDk  
void CCaptureDlg::OnCancel() l/;X?g5+  
{ :0Z^uuk`gq  
 if(bTray) ?X@fKAj  
  DeleteIcon(); n]8<DX99Q0  
  CDialog::OnCancel(); %X#zj"  
} :#dE:L;T  
2,ECYie^  
void CCaptureDlg::OnAbout() )`^p%k  
{ /Mb"V5S(W  
 CAboutDlg dlg; h-iJlm  
 dlg.DoModal(); /cc\fw1+  
} o7IxJCL=Q  
 hi g2  
void CCaptureDlg::OnBrowse() [+O"<Ua  
{ GfM;saTz{  
 CString str; j ";2o(  
 BROWSEINFO bi; (sVi\R  
 char name[MAX_PATH]; nUkaz*4qU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); f~ }H  
 bi.hwndOwner=GetSafeHwnd(); !i=nSqW  
 bi.pszDisplayName=name; 9UvXC)R1  
 bi.lpszTitle="Select folder"; J2uZmEt  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^CwR!I.D}4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [+qCs7'  
 if(idl==NULL) v[Kxja;  
  return; g{5A4|_7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C8F7bG8c  
 str.ReleaseBuffer(); sz9L8f2  
 m_Path=str; CI3XzH\IX*  
 if(str.GetAt(str.GetLength()-1)!='\\') Z7 E  
  m_Path+="\\"; bWOS `5  
 UpdateData(FALSE); qzb<J=FAU  
} DTWD |M  
_X@v/sAy  
void CCaptureDlg::SaveBmp() cQ9q;r`%  
{ {Zp\^/  
 CDC dc; Nk {XdrY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); V!)O6?l  
 CBitmap bm; T#bu V  
 int Width=GetSystemMetrics(SM_CXSCREEN); ZvcJK4hi  
 int Height=GetSystemMetrics(SM_CYSCREEN); g-Pwp[!qkf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Web|\CH  
 CDC tdc; OyqNLR  
 tdc.CreateCompatibleDC(&dc); fu~ +8CE.  
 CBitmap*pOld=tdc.SelectObject(&bm); a# c6[!   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^ns@O+Fk  
 tdc.SelectObject(pOld); {rcnM7 S1L  
 BITMAP btm; =y=cW1TG  
 bm.GetBitmap(&btm); }NsUnbxT  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =J1rlnaaEL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #-h\.#s  
 BITMAPINFOHEADER bih; c'*a{CV4P  
 bih.biBitCount=btm.bmBitsPixel; T?4G'84nN  
 bih.biClrImportant=0; EI\9_}@,  
 bih.biClrUsed=0; Qt|c1@J  
 bih.biCompression=0; `"%T=w  
 bih.biHeight=btm.bmHeight; *OQG 4aWy  
 bih.biPlanes=1; OgX6'E\E  
 bih.biSize=sizeof(BITMAPINFOHEADER); ETB6f  
 bih.biSizeImage=size; O:da-xWJ  
 bih.biWidth=btm.bmWidth; p ;|jI1  
 bih.biXPelsPerMeter=0; '= l[;Q^Q  
 bih.biYPelsPerMeter=0; < })'Y~i  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7 [g/TB  
 static int filecount=0; P6MRd/y |  
 CString name; gzeQ|m2]  
 name.Format("pict%04d.bmp",filecount++); L<fvKmo(fw  
 name=m_Path+name; JgHM?AWg|  
 BITMAPFILEHEADER bfh; .Lfo)?zG  
 bfh.bfReserved1=bfh.bfReserved2=0; Mg^e3D1_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o=nsy]'&  
 bfh.bfSize=54+size; w9|w2UK  
 bfh.bfOffBits=54; T~b>B`_  
 CFile bf; 29reG,>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q[#vTB$f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7w3CXY  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }2ZsHM^]%  
  bf.WriteHuge(lpData,size); Ko^c|}mh*!  
  bf.Close(); Vx @|O%  
  nCount++; Yq/.-4 y  
 }  YBnA+l*  
 GlobalFreePtr(lpData); itzyCw2|#  
 if(nCount==1) [V}S <Xp  
  m_Number.Format("%d picture captured.",nCount); ]D,MiDph  
 else 5aa<qtUjH  
  m_Number.Format("%d pictures captured.",nCount); j^`hzh3S  
  UpdateData(FALSE); A19;1#$=  
} A4ISNM7R[  
J/3_C6UZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 'TA UE{{  
{ Z y_V9j[n  
 if(pMsg -> message == WM_KEYDOWN) M?;y\vS?.  
 { +&["HoKg}&  
  if(pMsg -> wParam == VK_ESCAPE) b=/curl&  
   return TRUE; ~xoF6 CF  
  if(pMsg -> wParam == VK_RETURN) 77Bgl4P  
   return TRUE; YZ+RWu9K  
 } \o';"Q1H  
 return CDialog::PreTranslateMessage(pMsg); ]~\sA  
} y9KB< yh/  
}mZwd_cK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <r3J0)r}  
{ JCW\ *R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kHqztg  
  SaveBmp(); |`;54_f  
  return FALSE; It75R}B   
} pa{re,O"e  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ KWWa&[ev)  
 CMenu pop; ox ;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3 zn W=  
 CMenu*pMenu=pop.GetSubMenu(0); E#F/88(  
 pMenu->SetDefaultItem(ID_EXITICON); )Jv[xY~  
 CPoint pt; kkK kf'  
 GetCursorPos(&pt); t>H`X~SR?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K).n.:vYZ  
 if(id==ID_EXITICON) mRZ :ie  
  DeleteIcon(); ]f1{n  
 else if(id==ID_EXIT) YX*Qd$chZ  
  OnCancel(); hxS 6:5Uc  
 return FALSE; R-P-i0 ~  
} K+6e?5t  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y7^{yS[,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  kQ   
 AddIcon(); Ldn8  
 return res; 'fL"txW  
} 5MSB dO  
ce6__f 5?  
void CCaptureDlg::AddIcon() FW.$5*f='  
{ x=#VX\5k:  
 NOTIFYICONDATA data; CNww`PX,zZ  
 data.cbSize=sizeof(NOTIFYICONDATA); kD}Y|*]5-5  
 CString tip; #A8@CA^d  
 tip.LoadString(IDS_ICONTIP); HfLLlH<L`&  
 data.hIcon=GetIcon(0); ^#0U  ?9  
 data.hWnd=GetSafeHwnd(); 7L^%x3-|&  
 strcpy(data.szTip,tip); Xo*DvD  
 data.uCallbackMessage=IDM_SHELL; sp* Vqd  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 03j]d&P%d  
 data.uID=98; ~l2aNVv;  
 Shell_NotifyIcon(NIM_ADD,&data); LF0sH)e]  
 ShowWindow(SW_HIDE); WlYs~(= 9  
 bTray=TRUE; CwJDmz\tk  
} Q%-di=  
R-:fd!3oQ  
void CCaptureDlg::DeleteIcon() 7G)H.L)$m"  
{ PoIl>c1MS  
 NOTIFYICONDATA data; 1$*%"5a  
 data.cbSize=sizeof(NOTIFYICONDATA); b2@VxdFN  
 data.hWnd=GetSafeHwnd(); NuU9~gSQ  
 data.uID=98; X(7qZ P~  
 Shell_NotifyIcon(NIM_DELETE,&data); (mlzg=szW  
 ShowWindow(SW_SHOW); KeNL0_ Pw  
 SetForegroundWindow(); oc^Br~ Th  
 ShowWindow(SW_SHOWNORMAL); Dk5Zh+^  
 bTray=FALSE; %e@HZ"V  
} |!F5.%PY  
[NFNzwUB  
void CCaptureDlg::OnChange() &)oOeRwi].  
{ &ZTr  
 RegisterHotkey(); A 8 vbQ  
} 6&bIXy  
!a~`Bs$'jr  
BOOL CCaptureDlg::RegisterHotkey() yObuWDA9  
{ al`3Lu0  
 UpdateData(); kapC%/6"  
 UCHAR mask=0; z%/N!RLW  
 UCHAR key=0; `CeJWL5{  
 if(m_bControl) *:O.97q@h  
  mask|=4; o!~Jzd.=h  
 if(m_bAlt) 1@gguRF:  
  mask|=2; 4H+Ked&Oq  
 if(m_bShift) s{w[b\rA  
  mask|=1; !p1qJ [  
  key=Key_Table[m_Key.GetCurSel()]; M?/jkc.8H  
 if(bRegistered){ M4WiT<|]R  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mE^o-9/  
  bRegistered=FALSE; 4tx|=;@0  
 } 0 P[RyQI  
 cMask=mask; ?2Kt'1s#  
 cKey=key; 7r{83_B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j w* IO  
 return bRegistered; S"wg2X<  
} .Q)|vq^  
K\)Td+~jc  
  四、小结 kg`.[{k  
>Yt/]ta4+  
  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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