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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: (PCimT=5  
  uE,i-g0$Id  
  一、实现方法 9 _M H  
JcvHJ0X~a  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: J6@(X8w{j  
^4xlZouCb  
#pragma data_seg("shareddata") &&(4n?   
HHOOK hHook =NULL; //钩子句柄 uR06&SaA>  
UINT nHookCount =0; //挂接的程序数目 )@8'k]Glw.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }<( "0jC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?D*Hl+iu  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?$"x^=te7  
static int KeyCount =0; T..N*6<X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4_6W s$x  
#pragma data_seg() RZ#alFL,  
JfZL?D{NM  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 C?GvTc  
^%K1R;  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ;,F-6RNj  
rh:s 7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR TTA{#[=7  
cKey,UCHAR cMask) Z^/z  
{ VYl_U?D  
 BOOL bAdded=FALSE; bqw/O`*wfN  
 for(int index=0;index<MAX_KEY;index++){ A&NC0K}G!  
  if(hCallWnd[index]==0){ D\45l  
   hCallWnd[index]=hWnd; *6 z'+'  
   HotKey[index]=cKey; J[j/aDdP  
   HotKeyMask[index]=cMask; ue6/EN;}  
   bAdded=TRUE; ,$MWk(S  
   KeyCount++; bm|Jb"T0b  
   break; Nt`F0 9S  
  } Z/V`Z* fy  
 } &.cGj @1!J  
 return bAdded; LW83Y/7  
} ;ZxK3/(7  
//删除热键 rQd1Ch  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sa h<sb=  
{ x*loACee.  
 BOOL bRemoved=FALSE; "W?l R4  
 for(int index=0;index<MAX_KEY;index++){ hQg,#r(JE4  
  if(hCallWnd[index]==hWnd){ C&gOA8nf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zumR(<l  
    hCallWnd[index]=NULL; 'mBLf&fB  
    HotKey[index]=0; OEy:#9<'  
    HotKeyMask[index]=0; g[=\KrTSg  
    bRemoved=TRUE; .-C+0L1j  
    KeyCount--; E>l#0Zw  
    break; `'G),{ j  
   } ^G'yaaLXR  
  } h8iaJqqvJ  
 } ~,1-$#R  
 return bRemoved; nU?Xc(Xy  
} {L-{Y<fke  
wRV`v$*6  
%mB!|'K%  
  DLL中的钩子函数如下: ;*>QG6Fh  
]Vf8mkDGO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~ X]"P4 u  
{ o5*74Mv  
 BOOL bProcessed=FALSE; ?vht~5'  
 if(HC_ACTION==nCode) T(sG.%  
 { 1eE]4Z4Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JhMrm%  
   switch(wParam) 9AVK_   
   {  $.r}g\43P  
    case VK_MENU: X_0{*!v8  
     MaskBits&=~ALTBIT; q^jqLT&w  
     break; ${TB2q}%  
    case VK_CONTROL: Ru9pb~K  
     MaskBits&=~CTRLBIT; 6?<`wGs(  
     break; , IMT '*  
    case VK_SHIFT: :uT fhr  
     MaskBits&=~SHIFTBIT; T_(e(5  
     break; =XRgT1>e  
    default: //judge the key and send message .^9/ 0.g8t  
     break; XDrlJvrPL  
   } /_zF?5h  
   for(int index=0;index<MAX_KEY;index++){ Y>dg10=  
    if(hCallWnd[index]==NULL) *FLTz(T  
     continue; IJ #v"! D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fr,CH{Uq  
    { 6gg#Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y00i{/a 8  
     bProcessed=TRUE; Ivt)Eg  
    } ?4wehcZz  
   } ?Qo_ KQ%sn  
  } dp//p)B>  
  else if((lParam&0xc000ffff)==1){ //有键按下 0-t4+T  
   switch(wParam) 0+2Matk>.  
   { @0/@p"j  
    case VK_MENU: O w($\,  
     MaskBits|=ALTBIT; g1hg`qBBW  
     break; Be14$7r  
    case VK_CONTROL: {Gb)Et]<  
     MaskBits|=CTRLBIT; gk_Xu  
     break; &>) `P[x  
    case VK_SHIFT: <4!&iU+;  
     MaskBits|=SHIFTBIT; N8L)KgM5#7  
     break; V"2AN3~&  
    default: //judge the key and send message [hv3o0".  
     break;  h>L6{d1  
   } {6=H/g=:i  
   for(int index=0;index<MAX_KEY;index++){ Me K\eZ\  
    if(hCallWnd[index]==NULL) y?R <g^A  
     continue; #:ED 0</  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m|Q&Lphb8  
    { PE;0 jgsiI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @=<TA0;LL  
     bProcessed=TRUE; 6q  xUT  
    } oVuj020  
   } QLpTz"H  
  } *>&N t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K_lCDiqG  
   for(int index=0;index<MAX_KEY;index++){ 9V4V}[%  
    if(hCallWnd[index]==NULL) v\?\(Y55Y  
     continue; c;t(j'k`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BorfEv} SN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bcx{_&1p  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <1'X)n&Kw$  
   } = VX<eV  
  } *V@MAt  
 } n'ca*E(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ->"h5h  
} gU 2c--`  
! ,(bXa\^  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: dXK~ Z:  
Y;/=3T7An  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IDk:jO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OTFu4"]M  
o}^vREO  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: I3E8vi%B.  
C5lD Hw[CX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zC>(!fJqq  
{ S,<.!v57  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) * SON>BSF  
 { Kp=3\)&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $d??(   
  SaveBmp(); )i6U$,]  
  return FALSE; $b 71  
 } F0ivL`  
 …… //其它处理及默认处理 k s`  
} ;Q,).@<C  
|s3HeY+Co  
PA-0FlV|  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 g7Q*KA+  
*ej o6>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 HOQ _T4  
uxJiec`&  
  二、编程步骤 *1$~CC7  
+fQ$~vr{'  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; O>):^$-K%  
#pn AK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9 0if:mYA  
K'rs9v"K|  
  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; Nm:<rI,^  
N,+g/o\f  
  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; #1!BD!u  
^fiRRFr[  
  5、 添加代码,编译运行程序。 md +`#-D\O  
czsoD) N  
三、程序代码 SFPIr0 u  
d@`:9 G3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /t6u"I~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Hr,gV2n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =/'*(\C2  
#if _MSC_VER > 1000 ?}Ptb&Vk(  
#pragma once r_<i*l.  
#endif // _MSC_VER > 1000 \C\y' H5  
#ifndef __AFXWIN_H__ A)a+LW'=u  
#error include 'stdafx.h' before including this file for PCH cz~11j#  
#endif Ecl7=-y  
#include "resource.h" // main symbols " 7g8 d  
class CHookApp : public CWinApp [Ik B/Xbw|  
{ .;v'oR1x5  
 public: PaI63 !  
  CHookApp(); o|n0?bThS-  
  // Overrides  hahD.P<  
  // ClassWizard generated virtual function overrides  SSM> ID  
  //{{AFX_VIRTUAL(CHookApp) eS%6 h U b  
 public: "ZB`fNE  
  virtual BOOL InitInstance(); UlZ)|Ya<M  
  virtual int ExitInstance(); [ Zqg"`  
  //}}AFX_VIRTUAL *8eh%3_$h  
  //{{AFX_MSG(CHookApp) 1ZW'PXUZ  
  // NOTE - the ClassWizard will add and remove member functions here. tfIBsw.  
  // DO NOT EDIT what you see in these blocks of generated code ! &MLhCekY  
  //}}AFX_MSG K>JU/(  
  DECLARE_MESSAGE_MAP() kT=|tQ@  
}; ' g!_Flk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); NP`ll0s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?B:wV?-`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {ZI6!zh'  
BOOL InitHotkey(); NbMH@6%E  
BOOL UnInit(); %.gjBI=  
#endif bD[W~ku  
\ bmboNe  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O.f3 (e!  
#include "stdafx.h" X?xm1|\  
#include "hook.h" SL 5DWZ  
#include <windowsx.h> `l40awGCz  
#ifdef _DEBUG 1,D ^,  
#define new DEBUG_NEW %31K*i/]  
#undef THIS_FILE ?O^:j!C6  
static char THIS_FILE[] = __FILE__; qGUe0(  
#endif %pKs- n`  
#define MAX_KEY 100 h0QQP  
#define CTRLBIT 0x04 AQGE(%X  
#define ALTBIT 0x02 u+FftgA  
#define SHIFTBIT 0x01 aVL%-Il}  
#pragma data_seg("shareddata") j'b4Sb s-f  
HHOOK hHook =NULL; 4KB?g7_*  
UINT nHookCount =0; 5. UgJ/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J, U~ .c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?Og ;W9i  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F<<H [,%0  
static int KeyCount =0; >(J!8*7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift PEhLzZX+  
#pragma data_seg() XYVeHP!  
HINSTANCE hins; p tfADG  
void VerifyWindow(); S(s~4(o>8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z'M@DY/fdK  
//{{AFX_MSG_MAP(CHookApp) O@&I.d$  
// NOTE - the ClassWizard will add and remove mapping macros here. tELnq#<6  
// DO NOT EDIT what you see in these blocks of generated code! 56aJE .?<  
//}}AFX_MSG_MAP I4ct``Di  
END_MESSAGE_MAP() :dc J6  
P?ol]MwaB  
CHookApp::CHookApp() z1A-EeT  
{ v xZUtyJfe  
 // TODO: add construction code here, m5g: Q  
 // Place all significant initialization in InitInstance 5WG@ ;K%  
} 780MSFV8  
AMfu|%ZL  
CHookApp theApp; hzVO.Q*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QNBzc {XB  
{ %?wE/LU>  
 BOOL bProcessed=FALSE; }+3~y'k  
 if(HC_ACTION==nCode) 2Rt ZTn  
 { (G'ddZAJV  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,urkd~  
   switch(wParam) ;!Bkk9r"H  
   { 5mBk[{  
    case VK_MENU: CBHWMetJ*  
     MaskBits&=~ALTBIT; cne[-E  
     break; sTYl' Ieg  
    case VK_CONTROL: 1 SZa\ ][@  
     MaskBits&=~CTRLBIT; ~kFRy{z  
     break; GoXHVUyp  
    case VK_SHIFT: uf3 gVS_h=  
     MaskBits&=~SHIFTBIT; I9aber1  
     break; .6(i5K  
    default: //judge the key and send message Onyq'  
     break;  .l'QCW9  
   } (P_+m#  
   for(int index=0;index<MAX_KEY;index++){ AIo;\35  
    if(hCallWnd[index]==NULL) RH'R6  
     continue; J#nEGl|a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $o^}<)DW  
    { m8`A~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1 crjRbi  
     bProcessed=TRUE; Xb;`WE gC  
    } 6P $q7G  
   } ?!vW&KJZx  
  } .=D6<4#t  
  else if((lParam&0xc000ffff)==1){ //Key down !qq@F%tv  
   switch(wParam) 1Pc'wfj  
   { ?RyvM_(N6  
    case VK_MENU: U:(t9NX b  
     MaskBits|=ALTBIT; /iy/2x28>  
     break; Vngi8%YWp  
    case VK_CONTROL: _en8hi@Z  
     MaskBits|=CTRLBIT; g9.hR8X  
     break; M?97F!\U  
    case VK_SHIFT: Kep?=9r4+  
     MaskBits|=SHIFTBIT; ?whp _  
     break; xbIA97g-O,  
    default: //judge the key and send message 5$w1[}UUd  
     break; 0eIR)#j*  
   } CQ ?|=cN  
   for(int index=0;index<MAX_KEY;index++) fW`F^G1R  
   { BC+qeocg  
    if(hCallWnd[index]==NULL) U[u6UG  
     continue; tL|Q{+i yE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PV Q%y  
    { X?a67qL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `WL*Jb  
     bProcessed=TRUE; a WC sLH  
    } ujBADDwOg)  
   } lnUy ? 0(  
  } ==9Ez  
  if(!bProcessed){ l0V@19Ec  
   for(int index=0;index<MAX_KEY;index++){ co|0s+%PBq  
    if(hCallWnd[index]==NULL) <z PyID`  
     continue; s,= ^V/c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7va%-&.&t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >@o*v*25  
   } .l!Z=n|  
  } sy?W\(x  
 } fC[gu$f][  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rCYn YA  
} hR2.w/2j  
G})mw  
BOOL InitHotkey() XafyI*pOX  
{ oj,  
 if(hHook!=NULL){ $6[]c)(  
  nHookCount++; OduTg^R  
  return TRUE; jTJ[2WaS  
 } sh RvwE[  
 else r}w 9?s^rB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Kk#@8h>  
  if(hHook!=NULL) wO9<An  
   nHookCount++; Bf.RYLsh6  
  return (hHook!=NULL); xYq8\9Qb  
} qYs6PLC  
BOOL UnInit() H#:Yw|t  
{ im`^_zebj  
 if(nHookCount>1){ 9v A`\\9  
  nHookCount--; 4+0Zj+ q";  
  return TRUE; fr7/%{s  
 } }9JPSl28Jr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )/Vr 5b@  
 if(unhooked==TRUE){ a &j?"o  
  nHookCount=0; 'AoH2 |  
  hHook=NULL; ( KrIMZ  
 } ~kga+H  
 return unhooked; f\JyN@w+  
} hV%l}6yS&  
qi$8GX=~r  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $i hI Hl6'  
{ i8]r }a  
 BOOL bAdded=FALSE; S;C3R5*:  
 for(int index=0;index<MAX_KEY;index++){ pJI H_H  
  if(hCallWnd[index]==0){ ! ^W|;bq  
   hCallWnd[index]=hWnd; FWj~bn  
   HotKey[index]=cKey; Hcpw [%(  
   HotKeyMask[index]=cMask; {+ m)*3~w  
   bAdded=TRUE; UTz;Sw?~hw  
   KeyCount++; cjL!$OE6  
   break; A, os rv  
  } 7hc(]8eP  
 } kF5}S8B  
 return bAdded; mMR[(  
} ifkA3]  
CfAqMH*ip  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;4 &~i  
{ >&TktQO_T  
 BOOL bRemoved=FALSE; _VJb i,V  
 for(int index=0;index<MAX_KEY;index++){ _MR2,mC  
  if(hCallWnd[index]==hWnd){ =F`h2A;a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CNwhH)*  
    hCallWnd[index]=NULL; .F]6uXd  
    HotKey[index]=0; ,W#y7 t  
    HotKeyMask[index]=0; 9}4L 8?2  
    bRemoved=TRUE; =\3*;59\  
    KeyCount--; 6l=n&YO  
    break; {Hb _o)S  
   } &I70veNY  
  } jq[>PvR  
 } =($qiL'h  
 return bRemoved; k";;Snk  
} au8) G_A  
2XE4w# [j  
void VerifyWindow() r"n)I$  
{ h'bxgIl'`  
 for(int i=0;i<MAX_KEY;i++){ @/9> /?JP  
  if(hCallWnd!=NULL){ BKIt,7j  
   if(!IsWindow(hCallWnd)){ n4:WM+f4  
    hCallWnd=NULL;  2}`OjVS  
    HotKey=0; rnW i<Se  
    HotKeyMask=0; DCNuvrZ  
    KeyCount--; U{ Y)\hR-  
   } x&;SLEM   
  } Awj`6GeJ  
 } f_ ::?  
} -Ju!2by  
xGA%/dy,;  
BOOL CHookApp::InitInstance() 1.uyu  
{ 1*a2s2G '  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); w<'mV^S  
 hins=AfxGetInstanceHandle(); <"t >!I  
 InitHotkey(); 6S<pWR~  
 return CWinApp::InitInstance(); $FAl9  
} {u:DC4eut  
IE|$>q0Z  
int CHookApp::ExitInstance() !rXyw`6N  
{ v(af aN  
 VerifyWindow(); `527vK 6  
 UnInit(); !6kLg1  
 return CWinApp::ExitInstance(); 8\[6z0+;  
} LOQEU? z  
m\Dbb.vBvW  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file # wG}T .*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E)`+1j  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FuD$jsEw  
#if _MSC_VER > 1000 kweypIB  
#pragma once {RzlmDStV  
#endif // _MSC_VER > 1000 <$UY{"?  
O|8p #  
class CCaptureDlg : public CDialog KQEnC`Nz  
{ `InS8PLr  
 // Construction $FD0MrB_+  
 public: N[AX29  
  BOOL bTray; i |C'_gw`n  
  BOOL bRegistered; @P% &Dha  
  BOOL RegisterHotkey(); zW\&q!`IRP  
  UCHAR cKey; f#[Fqkmj  
  UCHAR cMask; kQYX[e7n  
  void DeleteIcon(); d/"e3S1  
  void AddIcon(); 7VR+EV  
  UINT nCount; .~Td /o7  
  void SaveBmp(); A$ s4Q0Mf  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0{ \AP<  
  // Dialog Data Q|;8\5  
  //{{AFX_DATA(CCaptureDlg) iLgWzA  
  enum { IDD = IDD_CAPTURE_DIALOG }; Yw./V0Z{@  
  CComboBox m_Key; '(ql7  
  BOOL m_bControl; Xbfn@7m  
  BOOL m_bAlt; EKgTRRW  
  BOOL m_bShift; HogT#BMs  
  CString m_Path; 1}'|HAu  
  CString m_Number; M[SWMVN{  
  //}}AFX_DATA p0[ %+n%  
  // ClassWizard generated virtual function overrides :]:q=1;c  
  //{{AFX_VIRTUAL(CCaptureDlg) nq r[HFWs  
 public: ~ZT(@w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1{_;`V  
 protected: p6|0JBm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mI}1si=$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @<l7"y;\  
  //}}AFX_VIRTUAL }O8$?7j(  
  // Implementation 6tj +  
 protected: rIy,gZr.U  
  HICON m_hIcon; ^xFZ;Yf  
  // Generated message map functions 8n NRn[oS  
  //{{AFX_MSG(CCaptureDlg) bz,C%HFA  
  virtual BOOL OnInitDialog(); !}<Y^="  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); FL- sXg  
  afx_msg void OnPaint(); ,|}Pof=]xk  
  afx_msg HCURSOR OnQueryDragIcon(); o AvX(  
  virtual void OnCancel(); O TSbhI'v  
  afx_msg void OnAbout(); .I<#i9Le  
  afx_msg void OnBrowse(); I)T]}et  
  afx_msg void OnChange(); '`^`NI`  
 //}}AFX_MSG ]Z6==+mCP  
 DECLARE_MESSAGE_MAP() r;SA1n#  
};  qauk,t  
#endif 66!cfpM  
|h4aJv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >}Fe9Y.o  
#include "stdafx.h" X)x$h{ OE  
#include "Capture.h" fn]f$n*`  
#include "CaptureDlg.h" ``DS?pUY  
#include <windowsx.h> 8Y_wS&eB  
#pragma comment(lib,"hook.lib") HvLvSy1U  
#ifdef _DEBUG Xb.WI\Eh  
#define new DEBUG_NEW w 7s+6,  
#undef THIS_FILE xmsw'\  
static char THIS_FILE[] = __FILE__; tWT@%(2~0  
#endif } U\n:@:2B  
#define IDM_SHELL WM_USER+1 (w `9*1NO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~{/"fTif  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r< sx On  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |aIY  
class CAboutDlg : public CDialog ,p {|f}0  
{ 9/'zk  
 public: 09HlL=0q  
  CAboutDlg(); AQ7w5}g+V  
  // Dialog Data %dw@;IZ#8{  
  //{{AFX_DATA(CAboutDlg) f+d[Q1  
  enum { IDD = IDD_ABOUTBOX }; }\?UmuolQ  
  //}}AFX_DATA EPkmBru ^  
  // ClassWizard generated virtual function overrides <#k(g\/R  
  //{{AFX_VIRTUAL(CAboutDlg) .0}]/%al  
 protected: tUaDwIu#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2= S;<J  
  //}}AFX_VIRTUAL Db3# ;  
  // Implementation 1<IF@__  
 protected: G AI( =  
  //{{AFX_MSG(CAboutDlg) &>,c..Ke  
  //}}AFX_MSG Ahv%Q%m%2  
  DECLARE_MESSAGE_MAP() !#xk?LyB  
}; Q+YYj  
j]~;|V5Z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nJC/yS |  
{ 6R1}fdHvP  
 //{{AFX_DATA_INIT(CAboutDlg) 1 CXO=Q  
 //}}AFX_DATA_INIT xy;u"JY*  
} [+j }:u  
pbJC A&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) P+K< /i  
{ rlV:% k  
 CDialog::DoDataExchange(pDX); mhpaPin*JS  
 //{{AFX_DATA_MAP(CAboutDlg) EVYICR5g  
 //}}AFX_DATA_MAP X+dLk(jI`u  
} 1g<jr.  
-!4Mmp"2@u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1<766  
 //{{AFX_MSG_MAP(CAboutDlg) h0ml#A`h  
 // No message handlers uI lm!*0  
 //}}AFX_MSG_MAP (]ToBju  
END_MESSAGE_MAP() \2]M &n GT  
qD!qSM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,E ]vM&  
: CDialog(CCaptureDlg::IDD, pParent) jjLx60|{  
{ p`N+9t&I4  
 //{{AFX_DATA_INIT(CCaptureDlg) fXD9w1  
  m_bControl = FALSE; `-yo-59E[  
  m_bAlt = FALSE; Fp=O:]  
  m_bShift = FALSE; !79eF)  
  m_Path = _T("c:\\"); # O<,  
  m_Number = _T("0 picture captured."); :Q]P=-Y8  
  nCount=0; >x'R7z23  
  bRegistered=FALSE; l|{q8i#4V  
  bTray=FALSE; X3mHg5zt  
 //}}AFX_DATA_INIT csK;GSp}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Qze.1h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3&`LVhx  
} :yFUlO:  
-?%81 z.Qq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d0U-:S-  
{ !DU4iq_.  
 CDialog::DoDataExchange(pDX); -}:; EGUtd  
 //{{AFX_DATA_MAP(CCaptureDlg) V)<Jj  
  DDX_Control(pDX, IDC_KEY, m_Key); ;8Qx~:c  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |[./jg"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ; ,9:1.L  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); XSOSy2:  
  DDX_Text(pDX, IDC_PATH, m_Path); ,9~=yC  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +V Oczl=  
 //}}AFX_DATA_MAP v0q(k;Ya  
} 0)Nu  
H"5=z7w  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X^o0t^  
//{{AFX_MSG_MAP(CCaptureDlg) 1Y+g^Z;G  
 ON_WM_SYSCOMMAND() yor6h@F1  
 ON_WM_PAINT() 3%~c\naD?O  
 ON_WM_QUERYDRAGICON() O n/q&h5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) aWS_z6[t#6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u,~/oTg O  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |X47&Y  
//}}AFX_MSG_MAP +Hd'*'c  
END_MESSAGE_MAP() ?Z(xu~^/  
fug F k  
BOOL CCaptureDlg::OnInitDialog() Gg TrIF  
{ P!xN]or]u  
 CDialog::OnInitDialog(); Wd>gOE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z{m%^,Cs,  
 ASSERT(IDM_ABOUTBOX < 0xF000); (Q(=MEar  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1[:tiTG|C  
 if (pSysMenu != NULL) rK~Obv  
 { IeN~ E'~  
  CString strAboutMenu; )=TS)C4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); j"5 $m@lgn  
  if (!strAboutMenu.IsEmpty()) vX;~m7+  
  { ^!A@:}t>  
   pSysMenu->AppendMenu(MF_SEPARATOR); /0 2-0mNv  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )dh_eqnX  
  } }}b &IA#  
 } +wIv|zj9  
 SetIcon(m_hIcon, TRUE); // Set big icon Xte"tf9(C  
 SetIcon(m_hIcon, FALSE); // Set small icon 6^vz+oN  
 m_Key.SetCurSel(0); ~{cG"  
 RegisterHotkey(); b=PB"-  
 CMenu* pMenu=GetSystemMenu(FALSE); 1ir~WFP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +yd{-iH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B%(-UTQf  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); | Kw}S/F  
 return TRUE; // return TRUE unless you set the focus to a control rO[ Zx'a  
} / n@by4;W  
tRYi q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bIy:~z5   
{ _z6" C8W  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *f-8egt-  
 { ]k)h<)nY  
  CAboutDlg dlgAbout; v43FU3  
  dlgAbout.DoModal(); (|dN6M-.K  
 } HDQH7Bs  
 else 8i~n;AhDs  
 { vYNu=vnM  
  CDialog::OnSysCommand(nID, lParam); |2!cPf^8  
 } @)x8<  
} $:IEpV{  
f#3!Q!C^  
void CCaptureDlg::OnPaint() m {?uR.O  
{ !SAR/sdXf  
 if (IsIconic()) St|B9V?eEB  
 { qr'P0+|~5  
  CPaintDC dc(this); // device context for painting v=J[p;H^H  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eh /QFm 4  
  // Center icon in client rectangle M/evZ?uis  
  int cxIcon = GetSystemMetrics(SM_CXICON); Oi4y~C_Xd  
  int cyIcon = GetSystemMetrics(SM_CYICON); e)#f`wM  
  CRect rect; NR.YeKsBq  
  GetClientRect(&rect); 3:MAdh[w  
  int x = (rect.Width() - cxIcon + 1) / 2; h(gpq SN  
  int y = (rect.Height() - cyIcon + 1) / 2; k.6(Q_TS  
  // Draw the icon i1 ^#TC$x  
  dc.DrawIcon(x, y, m_hIcon); }ZB :nnG  
 } glUf. :]  
 else eb=#{  
 { {w52]5l  
  CDialog::OnPaint(); wPQRm[O|  
 } q3e^vMK"  
} :\69N/uw`  
rvETt  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?bw1zYP  
{ J_N`D+m  
 return (HCURSOR) m_hIcon; `3'4_@7s9  
} E-i <^&E  
LWIPq"  
void CCaptureDlg::OnCancel() `kM:5f+>W  
{ j6#RV@ p`  
 if(bTray) $;As7MI  
  DeleteIcon(); v~KgCLo  
  CDialog::OnCancel(); 'eg;)e:`b+  
} w ;]~2$  
KiYz]IM$4  
void CCaptureDlg::OnAbout()  IA{I|g<  
{ R6E.C!EI  
 CAboutDlg dlg; <,huajQs  
 dlg.DoModal(); 7#9yAS+x(  
} uS&NRf9A  
hM~zO1XW  
void CCaptureDlg::OnBrowse() ST25RJC  
{ 0k 6S`e9gI  
 CString str; >?)Df(n(9  
 BROWSEINFO bi; @DniYt/  
 char name[MAX_PATH]; FWl'='5L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "Oq>i9v;|$  
 bi.hwndOwner=GetSafeHwnd(); gvy c(d  
 bi.pszDisplayName=name; 6+ C7vG`  
 bi.lpszTitle="Select folder"; ~spfQV~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 'J(B{B7|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <p\iB'y  
 if(idl==NULL) /8"9 sf *  
  return; NTy0NH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |^T?5=&Kt  
 str.ReleaseBuffer(); y)D7!s  
 m_Path=str; AA~6r[*~  
 if(str.GetAt(str.GetLength()-1)!='\\') 5~E'21hJ  
  m_Path+="\\"; B<6Ye9zuG  
 UpdateData(FALSE); {n-6e[  
} MNV OloA  
m+'vrxTY  
void CCaptureDlg::SaveBmp() !)+8:8H'  
{ KQ2jeJ/pj  
 CDC dc; '.1_anE]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~"8)9&  
 CBitmap bm; >'e(|P4  
 int Width=GetSystemMetrics(SM_CXSCREEN); kzXmiBL<9  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5$Da\?Fpn  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )Y 9JP@}T  
 CDC tdc; MrFi0G7u  
 tdc.CreateCompatibleDC(&dc); 5@< D6>6  
 CBitmap*pOld=tdc.SelectObject(&bm); Y=tx kN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); U]W+ers  
 tdc.SelectObject(pOld); T Z_](%  
 BITMAP btm; 7FvtWE*  
 bm.GetBitmap(&btm); $Oi@B)=4d+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]q<Zc>OC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tZqy \_G  
 BITMAPINFOHEADER bih; fLR\@f  
 bih.biBitCount=btm.bmBitsPixel; iz5WWn^  
 bih.biClrImportant=0; tC4 7P[b  
 bih.biClrUsed=0; a@}A;y'd  
 bih.biCompression=0; %VmHw~xyF:  
 bih.biHeight=btm.bmHeight; Y=YIz>u  
 bih.biPlanes=1; <P#]U"?A  
 bih.biSize=sizeof(BITMAPINFOHEADER); oY8S-N;(t  
 bih.biSizeImage=size; 9~6)u=4sS"  
 bih.biWidth=btm.bmWidth; 5&N55? G6  
 bih.biXPelsPerMeter=0; a^QyYX}\qR  
 bih.biYPelsPerMeter=0; c0Oc-,6J  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j_Q kw ?   
 static int filecount=0; C,#FH}  
 CString name; X0e#w?  
 name.Format("pict%04d.bmp",filecount++); ?/ Cl  
 name=m_Path+name; |)+; d  
 BITMAPFILEHEADER bfh; g}Esj"7  
 bfh.bfReserved1=bfh.bfReserved2=0; < rqFBq 8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r'~^BLT`#  
 bfh.bfSize=54+size; 'v:%} qMv  
 bfh.bfOffBits=54; 9e>Dqlv  
 CFile bf; p`}'-A|@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +ew9%={zB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ql.abU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^;gwD4(hs  
  bf.WriteHuge(lpData,size); M8}t`q[-&  
  bf.Close(); M->$ 'Zgh`  
  nCount++; eh5j  
 } "l.1 UB&  
 GlobalFreePtr(lpData); 41Htsj  
 if(nCount==1)  mZ^ev;  
  m_Number.Format("%d picture captured.",nCount); WZ]f \S  
 else i1k#WgvZR  
  m_Number.Format("%d pictures captured.",nCount); [mJmT->  
  UpdateData(FALSE); `am]&0g^+(  
} bUBQ  
#CYDh8X<i  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "Acc]CqH*  
{ 7GVI={ b  
 if(pMsg -> message == WM_KEYDOWN) Z[pMlg6Z  
 { /Xo8 kC  
  if(pMsg -> wParam == VK_ESCAPE) u[;,~eB%w  
   return TRUE; ** !  
  if(pMsg -> wParam == VK_RETURN) Gn7P` t*.  
   return TRUE; mpysnKH  
 } oo{3-+ ?  
 return CDialog::PreTranslateMessage(pMsg); ne (zGJd  
} TE!+G\@  
D<:J6W7]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g7r_jj%ow  
{ 1Zj NRg=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Q>[Xm)jr:  
  SaveBmp(); H 6~6hg  
  return FALSE; |NoTwK  
} gvl3NQQ%t  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <4m@WG  
 CMenu pop; z6+D=<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gV\{Qoj  
 CMenu*pMenu=pop.GetSubMenu(0); Yl#|+xYA5[  
 pMenu->SetDefaultItem(ID_EXITICON); jJOs`'~Q\  
 CPoint pt; !0k'fYCa  
 GetCursorPos(&pt); +'f+0T\)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~qP_1() ?  
 if(id==ID_EXITICON) SV}C]<  
  DeleteIcon(); dqu+-43I|  
 else if(id==ID_EXIT) * c1)x  
  OnCancel(); Y!C8@B$MR3  
 return FALSE; O<EFm}Ae  
} $VRVM Y [q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); WXzSf.8p|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dW`!/OaQD  
 AddIcon(); GL<u#[  
 return res; Z2cumx(  
} Sq Y$\&%  
6-oy%OnN  
void CCaptureDlg::AddIcon() 2S^:fm}  
{ rrL gBeQa  
 NOTIFYICONDATA data; Un[ 0or  
 data.cbSize=sizeof(NOTIFYICONDATA); U:1cbD7|3  
 CString tip; HZDeQx`*s  
 tip.LoadString(IDS_ICONTIP); +t hkx$o  
 data.hIcon=GetIcon(0); f+K vym.  
 data.hWnd=GetSafeHwnd(); jqeR{yo&0b  
 strcpy(data.szTip,tip); !i{9wI  
 data.uCallbackMessage=IDM_SHELL; KqI<#hUl  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W3.(s~ )o  
 data.uID=98; `z)q/;}fC  
 Shell_NotifyIcon(NIM_ADD,&data); ZD(VH6<g%  
 ShowWindow(SW_HIDE); C ks;f6G  
 bTray=TRUE; tW)K pX  
} yur5" $n  
a6<UMJ  
void CCaptureDlg::DeleteIcon() & uMx*TTY  
{ d)yu`U  
 NOTIFYICONDATA data; iXsX@ S^F  
 data.cbSize=sizeof(NOTIFYICONDATA); 6";ew:Ih^  
 data.hWnd=GetSafeHwnd(); !Yi2g -(  
 data.uID=98; ?Xq"Q^o4#e  
 Shell_NotifyIcon(NIM_DELETE,&data); 9>I&Z8J$M  
 ShowWindow(SW_SHOW); (O@fgBM  
 SetForegroundWindow(); uZ/XI {/  
 ShowWindow(SW_SHOWNORMAL); g;n6hXq4  
 bTray=FALSE; kQt#^pO)  
} 3)6&)7`*  
XGCjB{IV  
void CCaptureDlg::OnChange() }8e_  
{ q@(MD3OE  
 RegisterHotkey(); HZJ)q`1E  
} %UXmWXF4$  
C^^AN~ZD  
BOOL CCaptureDlg::RegisterHotkey() P1u(0t  
{  2.>aL  
 UpdateData(); M8{J  
 UCHAR mask=0; {IgL H`@  
 UCHAR key=0; JOUZ"^v  
 if(m_bControl) ^1mnw@04  
  mask|=4; D<wz%*  
 if(m_bAlt) pg9 feIW1  
  mask|=2; LuE0Hb"S8  
 if(m_bShift) 9 7Ua,  
  mask|=1; #M5pQ&yZy  
  key=Key_Table[m_Key.GetCurSel()]; xMr=tU1C  
 if(bRegistered){ kE`Fg(M  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6F8TiR&  
  bRegistered=FALSE; /Y#Q<=X  
 } `37%|e3bQ  
 cMask=mask; ]VcuD05"C  
 cKey=key; l&Cy K#B:\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); N eC]MW  
 return bRegistered; 9@^N* E+  
} ;BmPP,  
\`oP\|Z  
  四、小结 X@pcL{T!  
Q u_=K_W  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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