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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: Pko2fJt1  
  SGK=WLGM8  
  一、实现方法 2Ysl|xRo  
ZBcT@hxm  
  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: j 5{ "j  
f;Uf=.#F  
#pragma data_seg("shareddata") *B ]5K{N  
HHOOK hHook =NULL; //钩子句柄 9d8bh4[  
UINT nHookCount =0; //挂接的程序数目 T>e4Og"?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \ W.uV[\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 DuzJQ Sv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Y%"73.x  
static int KeyCount =0; }+3v5Nz;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tJgo% P1  
#pragma data_seg() #lo1GoL\  
\&#pJBBG  
  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。 3<vw#]yL  
n |Is&fy  
  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: )cUFb:D*"  
>ngP\&\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR {S 2? }  
cKey,UCHAR cMask) !hS~\+E  
{ ` fm^#Nw  
 BOOL bAdded=FALSE; u?-X07_  
 for(int index=0;index<MAX_KEY;index++){ PY{])z3N  
  if(hCallWnd[index]==0){ /QT"5fxKJ  
   hCallWnd[index]=hWnd; 8O='Q-& 8  
   HotKey[index]=cKey; %g+*.8;"b  
   HotKeyMask[index]=cMask;  jcVK4jW  
   bAdded=TRUE; XZ1oV?Z4  
   KeyCount++; W:V:Ej7 h  
   break; O77bm,E  
  } -Uu65m~:{k  
 } fH6mv0  
 return bAdded; WY3D.z-</  
} yWkg4  
//删除热键 mO|YX/>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p%?m|(4f  
{ co-dq\P  
 BOOL bRemoved=FALSE; J=@D]I*3  
 for(int index=0;index<MAX_KEY;index++){ ']cRSj.  
  if(hCallWnd[index]==hWnd){ g[ dI%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kEr; p{5  
    hCallWnd[index]=NULL; ,'0Zd(s  
    HotKey[index]=0; !caY  
    HotKeyMask[index]=0; )~CnDk}^R  
    bRemoved=TRUE; jXCSD@?]K  
    KeyCount--; vD@ =V#T  
    break; L%sskV(  
   } D <SLv,Y  
  } CQGq}.Jt!  
 } Q`* v|Lp  
 return bRemoved; U 4Sxr  
} *W&}}iL  
t7 ].33%\  
Aq~}<qkIF+  
  DLL中的钩子函数如下: `N.^+Mvx-  
I C?bqC+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $-Wn|w+h<a  
{ (|kcSnF0  
 BOOL bProcessed=FALSE; ~n<U8cm O  
 if(HC_ACTION==nCode) brXLx +H8  
 { dvLO#o{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 KDQqN]rg  
   switch(wParam) Yfotq9.=+  
   {  gZ b +m  
    case VK_MENU: -<MA\iSP  
     MaskBits&=~ALTBIT; QgZ`~  
     break; ljJi|+^$  
    case VK_CONTROL: qY^@^)b[  
     MaskBits&=~CTRLBIT; a"6AZT"8  
     break; T|fmO<e*n  
    case VK_SHIFT: zJ9[),;7B  
     MaskBits&=~SHIFTBIT; :#I7);ol  
     break; \4qw LM?E^  
    default: //judge the key and send message ~,jBm^4  
     break; sCi"qtHP  
   } byrK``f  
   for(int index=0;index<MAX_KEY;index++){ M`jqU g  
    if(hCallWnd[index]==NULL) ,|u^-J@  
     continue; %hnv go:^g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gp`H>Sn.|  
    { "?r=n@Kv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 45+w)Vf!  
     bProcessed=TRUE; @s[Vtw%f  
    } #Y9'n0 AL  
   } qT}AY.O%^  
  } ZA>p~Zt  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y  c]  
   switch(wParam) (}jYi*B  
   { ,dZ&i! @?  
    case VK_MENU: S="teH[  
     MaskBits|=ALTBIT; Vy6A]U\%  
     break; *RpBKm&^7  
    case VK_CONTROL: /xseI)y.B  
     MaskBits|=CTRLBIT; wAn}ic".b  
     break; WhU-^`[*  
    case VK_SHIFT: p(J,fus  
     MaskBits|=SHIFTBIT; (Z{&[h  
     break; *pMu,?uE  
    default: //judge the key and send message <XAW-m9SC  
     break; W{6%Hh p  
   } <R%]9#re  
   for(int index=0;index<MAX_KEY;index++){ |5(< Vk=  
    if(hCallWnd[index]==NULL) 'tRaF  
     continue; Kq. MmR!gl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mxxuD"5  
    { =^L?Sgg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (ZI11[e{  
     bProcessed=TRUE; ^.]]0Rp&  
    } g*uo2-MN&e  
   } sh|@X\EZO  
  } aLKvl~s;m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 GLIe8T*ht  
   for(int index=0;index<MAX_KEY;index++){ N9s ,..  
    if(hCallWnd[index]==NULL) H|]~(.w 1}  
     continue; vI)-Zz[3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ev'Bm Dk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); luYa+E0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 fsr0E=nV  
   } ?jDdF  
  } nWd]P\a'V  
 } _#2AdhCu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9N?BWv }  
} DQ a0S7I  
 a1p}y2  
  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: {Al}a`da  
<l,Kg 'v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2G4OK7x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e?"XMY  
X=Th  
  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: G"~%[k  
6,D)o/_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Uz&XqjS  
{ H%AF,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fNkN  
 { V6.w=6:`X  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Mr8r(LGY  
  SaveBmp(); G{8>  
  return FALSE; 'aFjyY?%  
 } j![;;  
 …… //其它处理及默认处理 1E]|>)$  
} X9lh@`3  
fT&>L  
RkW)B^#  
  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。 %#^)hX,+Q  
Z6Owxqfht  
  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。 K:i{us`  
,2I8,MOg  
  二、编程步骤 c,\!<4  
\vU1*:3  
  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"; 0!^vQ  
~S='~ g)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jZ;dY~fE  
jw^Pt~@  
  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; -wqnmK+G  
m3La;%aA0  
  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; T==(Pw7R7  
rTR4j>Ua~  
  5、 添加代码,编译运行程序。 Ai 9UB=[R  
6jGPmOM/  
三、程序代码 U6R"eQUTV  
D)u 9Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL QnWM<6xK"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <`~zKFUQ[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]B;\?Tim  
#if _MSC_VER > 1000 ns{BU->f  
#pragma once ;T6x$e  
#endif // _MSC_VER > 1000 ^YpA@`n  
#ifndef __AFXWIN_H__ s /? &H-  
#error include 'stdafx.h' before including this file for PCH cP4K9:k  
#endif k>N >_{\  
#include "resource.h" // main symbols Pd,+= ML  
class CHookApp : public CWinApp eTV%+  
{ cvf@B_iN9  
 public: YRkp(}*!\  
  CHookApp(); $SP*hkU  
  // Overrides ]T3dZ`-(  
  // ClassWizard generated virtual function overrides -d+o\qp"#  
  //{{AFX_VIRTUAL(CHookApp) "A9qC*6[  
 public: Pl/}`H:R&  
  virtual BOOL InitInstance(); q0sdL86  
  virtual int ExitInstance(); ;rj|>  
  //}}AFX_VIRTUAL W]B75  
  //{{AFX_MSG(CHookApp) [H4)p ,R  
  // NOTE - the ClassWizard will add and remove member functions here. _GW,9s^A  
  // DO NOT EDIT what you see in these blocks of generated code ! 'lWgHmE  
  //}}AFX_MSG #ULjK*)R  
  DECLARE_MESSAGE_MAP() $R&K-;D/8  
}; v?O6|0#x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k`(Cwp{Oc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Kry^ 47"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L9} %tEP  
BOOL InitHotkey(); IIh \ d.o  
BOOL UnInit(); Fo.p}j+>  
#endif 'nQQqx%v  
W ])Lc3X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. JmBe1"hs  
#include "stdafx.h" ^.g BHZ  
#include "hook.h" UlD]!5NO  
#include <windowsx.h>  I?R?rW  
#ifdef _DEBUG bnzIDsw!Q  
#define new DEBUG_NEW !,Uzt1K:  
#undef THIS_FILE KAI/*G\z  
static char THIS_FILE[] = __FILE__; @h E7F}  
#endif Ge_Gx*R  
#define MAX_KEY 100 e8,!x9%J  
#define CTRLBIT 0x04 wAA9M4  
#define ALTBIT 0x02 is6M{K3  
#define SHIFTBIT 0x01 JqTR4[`Z\  
#pragma data_seg("shareddata") Oj]4jRew  
HHOOK hHook =NULL; ~TfN*0  
UINT nHookCount =0;  8 ?4/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s2kom)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT :ceT8-PBRx  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Va-.  
static int KeyCount =0; 1e)5D& njS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -qs R,H  
#pragma data_seg() L"[>tY  
HINSTANCE hins; 3uy^o  
void VerifyWindow(); W*WSjuFr2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qe_qag9  
//{{AFX_MSG_MAP(CHookApp) h8 !(WO!  
// NOTE - the ClassWizard will add and remove mapping macros here. ^3O`8o  
// DO NOT EDIT what you see in these blocks of generated code! i5; _  
//}}AFX_MSG_MAP )YY8`\F>1  
END_MESSAGE_MAP() \R|qXB $  
q /eod  
CHookApp::CHookApp() spG3"Eodi  
{ MZWicfUy  
 // TODO: add construction code here, c`s ]ciC  
 // Place all significant initialization in InitInstance Dd' 4W  
} lU8X{SV!  
N_o|2  
CHookApp theApp; bH`r=@.:cu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q&`if O  
{ Vg^,Ky,  
 BOOL bProcessed=FALSE; 1zGhX]z  
 if(HC_ACTION==nCode) rp_Aw  
 { c4 bo  
  if((lParam&0xc0000000)==0xc0000000){// Key up &s~b1Va  
   switch(wParam) "?Yf3G:\0  
   { *wl&Zzx  
    case VK_MENU: #-7m@EU;O  
     MaskBits&=~ALTBIT; &]S\GnqlU]  
     break; j<PpCL_8%  
    case VK_CONTROL: +@BjQ|UZ  
     MaskBits&=~CTRLBIT; :TRhk.  
     break; X$(YCb  
    case VK_SHIFT: +2JC**)I  
     MaskBits&=~SHIFTBIT; ]&_z@Z.i  
     break; e3=-7FU  
    default: //judge the key and send message 20`QA u)'  
     break; r}M2t$nv  
   } 9?I?;l{  
   for(int index=0;index<MAX_KEY;index++){ bZCNW$C3l  
    if(hCallWnd[index]==NULL) ZRn!z`.0  
     continue; PL*1-t?#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i:n1Di1~E  
    { jpt-5@5O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u!TMt8+c  
     bProcessed=TRUE; P*g:rg  
    } cNG`-+U'  
   } /|WBk}  
  } !f01.Tq8  
  else if((lParam&0xc000ffff)==1){ //Key down +z O.|`+  
   switch(wParam) |wkUnn4UB8  
   { \xjI=P'-25  
    case VK_MENU: _r?.%] \.  
     MaskBits|=ALTBIT; ]EfM;'j[  
     break; 9/dI 6P7  
    case VK_CONTROL: |*y'H*  
     MaskBits|=CTRLBIT; O`TM}  
     break; k.?@qCs[  
    case VK_SHIFT: rOTxD/  
     MaskBits|=SHIFTBIT; .mvpFdn  
     break; k~=W1R%  
    default: //judge the key and send message V]6CHE:BS  
     break; I.{%e;Reg  
   } q 1~3T;Il  
   for(int index=0;index<MAX_KEY;index++) k*|WI$  
   { fYiof]v@_m  
    if(hCallWnd[index]==NULL) :89AYqT"  
     continue; Rd ,5 &X$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^+u/Lw&  
    { b>'y[P!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _qjkiKm?1F  
     bProcessed=TRUE; UUR` m  
    } +qee8QH  
   } 5K {{o''  
  } S&{#sl#e  
  if(!bProcessed){ AI9#\$aGV  
   for(int index=0;index<MAX_KEY;index++){ @%gth@8  
    if(hCallWnd[index]==NULL) k[8{N  
     continue; C7_nA:Rc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |`Q2K9'4bL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O>/& -Wk=  
   } ~pPj   
  } Y~P* !g  
 } "#=WD  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  li  
} fT0+i nRG  
cjc1iciZ  
BOOL InitHotkey() >{ .|Ng4K  
{ Fh~ pB>t  
 if(hHook!=NULL){ AR6hfdDDT  
  nHookCount++; J9q[u[QZ9O  
  return TRUE; n7iIY4gZ  
 } VY j pl  
 else Xo ,U$zE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {LqahO*  
  if(hHook!=NULL)  ?h3t"9  
   nHookCount++; 9e0t  
  return (hHook!=NULL); 63T4''bwu  
} 0<u(!iL  
BOOL UnInit() 2W6t0MgZ  
{ iE* Y@E5x0  
 if(nHookCount>1){ B<!WAw+  
  nHookCount--; M:R|hR{=*  
  return TRUE; e<duD W$X  
 } r%vO^8FQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *9|*21  
 if(unhooked==TRUE){ :\IZ-  
  nHookCount=0; FGu#Pa  
  hHook=NULL; L /V;;  
 } 04@?Jb1*  
 return unhooked; Zz^!QlF  
} `+5,=S  
VZCCMh-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K yDPD'  
{ \KkAU6  
 BOOL bAdded=FALSE; a"whg~  
 for(int index=0;index<MAX_KEY;index++){ e8VtKVcY  
  if(hCallWnd[index]==0){ gbjql+Mx+  
   hCallWnd[index]=hWnd; pXl *`[0X#  
   HotKey[index]=cKey; LHHDD\X   
   HotKeyMask[index]=cMask; c-=z<:Kf  
   bAdded=TRUE;  y aLc~K  
   KeyCount++; k*!f@ M  
   break; ?~WDl j3  
  } QRlrcauM  
 } z~\Y*\f^Y3  
 return bAdded; 5v5K}hx  
} cnR18NK  
:i/uRR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E2( {[J  
{ 7|^5E*8/  
 BOOL bRemoved=FALSE; Ue!~|:  
 for(int index=0;index<MAX_KEY;index++){ #Y<(7  
  if(hCallWnd[index]==hWnd){ TRku(w1f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N\W4LO6  
    hCallWnd[index]=NULL; 4<q'QU#l<  
    HotKey[index]=0; gYW  
    HotKeyMask[index]=0; TUM7(-,9  
    bRemoved=TRUE; ZGC*BP/  
    KeyCount--; >NAg*1  
    break; /4Jm]"  
   } N2\{h(*u  
  } }o2e&.$4d  
 } +~!\;71:f  
 return bRemoved; oh.8WlI  
} #6F/:j;  
Qcs >BOV~  
void VerifyWindow() *S] K@g  
{ 7N}==T89[  
 for(int i=0;i<MAX_KEY;i++){ faPgp  
  if(hCallWnd!=NULL){ IT0 [;eqR  
   if(!IsWindow(hCallWnd)){ /rZ`e'}  
    hCallWnd=NULL; Uq:CM6q\  
    HotKey=0; b";D*\=x  
    HotKeyMask=0; !y-,r4\@`  
    KeyCount--; :2E?|}`7\  
   } /6nj 4.xxc  
  } t{o&$s93  
 } 3B3l)eX  
} A v[|G4n  
WzdE XcY  
BOOL CHookApp::InitInstance() hVd PO  
{ yvt :/X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Pef$-3aP>E  
 hins=AfxGetInstanceHandle(); prCr"y` M  
 InitHotkey(); 0qhSV B5  
 return CWinApp::InitInstance(); ZFa<{J<2  
} -| YDKcL  
mxkv{;ad  
int CHookApp::ExitInstance() -efB8)A  
{ N!YjMx)P  
 VerifyWindow(); oz#;7 ?9  
 UnInit(); (#5TM1/A  
 return CWinApp::ExitInstance(); {5J: ]{p  
} y5$AAas  
  ]n (:X  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $}z%}v  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pPnJf{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1^^9'/  
#if _MSC_VER > 1000 #S*cFnd  
#pragma once KdU&q+C^  
#endif // _MSC_VER > 1000 @zAav>  
K %Qj<{)  
class CCaptureDlg : public CDialog Nd;,Wz]  
{ ~2M+Me  
 // Construction _~a5;[~  
 public: '1[Bbs  
  BOOL bTray; Q|i`s=|  
  BOOL bRegistered; O&ZVu>`g  
  BOOL RegisterHotkey(); Yo a|.2f  
  UCHAR cKey; K f}h{X  
  UCHAR cMask; >gGdzL  
  void DeleteIcon(); T<S_C$O  
  void AddIcon(); X+;{&Efrl  
  UINT nCount; ^rIe"Kx  
  void SaveBmp(); I%gDqfdL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GZk{tTv  
  // Dialog Data qTi%].F"G  
  //{{AFX_DATA(CCaptureDlg) SVj4K \F  
  enum { IDD = IDD_CAPTURE_DIALOG }; VKb'!Ystl  
  CComboBox m_Key; 8V(-S,  
  BOOL m_bControl; $<v{$UOh  
  BOOL m_bAlt; $5S/~8g(  
  BOOL m_bShift; 8*m=U@5]  
  CString m_Path; x9B5@2J1  
  CString m_Number; J4>k9~q  
  //}}AFX_DATA ]] Jg%}o  
  // ClassWizard generated virtual function overrides _{f7e^;  
  //{{AFX_VIRTUAL(CCaptureDlg) )9? ^;HS  
 public: C Ch38qBp  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8zWKKcf7t  
 protected: GjGt' m*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l>iE1`iL<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #oQDt'  
  //}}AFX_VIRTUAL XWNDpL`j5  
  // Implementation kNDN<L  
 protected: N\Li/  
  HICON m_hIcon; @>4=}z_e  
  // Generated message map functions 8@Hl0{q  
  //{{AFX_MSG(CCaptureDlg) Q]"u?Q]  
  virtual BOOL OnInitDialog(); h Lv_ER?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Gp5[H}8K  
  afx_msg void OnPaint(); iQj2aK Gs  
  afx_msg HCURSOR OnQueryDragIcon(); [|E|(@J  
  virtual void OnCancel(); =!Ce#p?h,  
  afx_msg void OnAbout(); dPO|x+N,  
  afx_msg void OnBrowse(); `ot <BwxJ  
  afx_msg void OnChange(); Md(h-wYr  
 //}}AFX_MSG y`Km96 Ui  
 DECLARE_MESSAGE_MAP() YKWts y  
}; <QZ X""  
#endif PS3%V_2  
?84B0K2N s  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $TR#-q  
#include "stdafx.h" V-.Nc#  
#include "Capture.h" D8,V'n>L  
#include "CaptureDlg.h" jpI=B  
#include <windowsx.h> wrmbOT  
#pragma comment(lib,"hook.lib") $(JB"%S8c  
#ifdef _DEBUG 9m:G8j'  
#define new DEBUG_NEW t!JD]j>q  
#undef THIS_FILE >wJt# ZB  
static char THIS_FILE[] = __FILE__; (HD=m, }  
#endif )mvD2]fK  
#define IDM_SHELL WM_USER+1 Tyk\l>S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]<B@g($  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); * M,'F^E2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AKkr )VgY  
class CAboutDlg : public CDialog |ZBHXv  
{ Rd^X.  
 public: _8eN^oc%  
  CAboutDlg(); ZclZD{%8J  
  // Dialog Data 6y d/3k  
  //{{AFX_DATA(CAboutDlg) 0b~{l;  
  enum { IDD = IDD_ABOUTBOX }; NP?hoqeKs  
  //}}AFX_DATA @/yJTMcf  
  // ClassWizard generated virtual function overrides Zwxu3R_  
  //{{AFX_VIRTUAL(CAboutDlg) q;0QI{:5v  
 protected: ;*=MI/"N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~w9.}   
  //}}AFX_VIRTUAL ZB@Bj>,b p  
  // Implementation >ho$mvT  
 protected: yYri.n  
  //{{AFX_MSG(CAboutDlg) \~bx%VWW4  
  //}}AFX_MSG z=/xv},  
  DECLARE_MESSAGE_MAP() !1<?ddH6  
}; j\9v1O!T  
C^W9=OH  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C. rLog#  
{ VvJ]*D+e  
 //{{AFX_DATA_INIT(CAboutDlg) *4oj' }  
 //}}AFX_DATA_INIT tH\ aHU[  
} ;4] sP^+  
k~+(X|!5w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }'.k  
{ <~}# Q,9  
 CDialog::DoDataExchange(pDX); nm.~~h+8M  
 //{{AFX_DATA_MAP(CAboutDlg) h..D1(M  
 //}}AFX_DATA_MAP @ %}4R`S0  
} 1deNrmp%  
?}D|]i34  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1y)|m63&  
 //{{AFX_MSG_MAP(CAboutDlg) >nA6w$  
 // No message handlers @+(TM5Ub  
 //}}AFX_MSG_MAP Ebk_(Py\  
END_MESSAGE_MAP() 5l ioL)  
P.Uz[_&l6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) g k.c"$2  
: CDialog(CCaptureDlg::IDD, pParent) \Rff3$  
{ 0>KW94  
 //{{AFX_DATA_INIT(CCaptureDlg) asQXl#4r  
  m_bControl = FALSE; @ a?^2X^  
  m_bAlt = FALSE; ; M%n=+[O  
  m_bShift = FALSE; EX.`6,:+2  
  m_Path = _T("c:\\"); fZ)M Dq  
  m_Number = _T("0 picture captured."); se:lKZZ]  
  nCount=0; =|_{J"sv  
  bRegistered=FALSE; *#n?6KqZ  
  bTray=FALSE; 4gRt^T-?  
 //}}AFX_DATA_INIT RO10$1IW.2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u_~*)w+mS@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); },@1i<Bb  
} @C34^\aH+  
?-g/hXx;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dLq)Z*r  
{ Np?%pB!Q  
 CDialog::DoDataExchange(pDX); 6)B6c. 5o  
 //{{AFX_DATA_MAP(CCaptureDlg) A^9RGz4=  
  DDX_Control(pDX, IDC_KEY, m_Key); %1Pn;bUU!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !L)~*!+Gf  
  DDX_Check(pDX, IDC_ALT, m_bAlt); RO?%0-6O&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); wh~g{(Xvq  
  DDX_Text(pDX, IDC_PATH, m_Path); (g8<"< N?  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S3oSc<&2  
 //}}AFX_DATA_MAP (4WAoye|  
} 3TDjWW;#~  
r?l7_aBv3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D0f.XWd  
//{{AFX_MSG_MAP(CCaptureDlg) TrBBV]4  
 ON_WM_SYSCOMMAND() H]XY  
 ON_WM_PAINT() ~)kOO oH  
 ON_WM_QUERYDRAGICON() r- :u*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b?~%u+'3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) O DLRzk(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) bZB7t`C5  
//}}AFX_MSG_MAP 0 kM4\E n  
END_MESSAGE_MAP() 9O.okU  
XYM 5'  
BOOL CCaptureDlg::OnInitDialog() YgN:$+g5  
{ x=%p~$C  
 CDialog::OnInitDialog(); e/p2| 4;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0F495'*A  
 ASSERT(IDM_ABOUTBOX < 0xF000); +mgmC_Q(0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >5aZ?#TS1  
 if (pSysMenu != NULL) VW[!%<  
 { 2qF ?%  
  CString strAboutMenu; R2 I 7d'|v  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yi*2^??` 1  
  if (!strAboutMenu.IsEmpty()) nX|f?5 O  
  { U^n71m>]%T  
   pSysMenu->AppendMenu(MF_SEPARATOR); XIAHUT5~J  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'fqX^v5n  
  } *x;&fyR  
 } +@ FM~q  
 SetIcon(m_hIcon, TRUE); // Set big icon []vt\I ;  
 SetIcon(m_hIcon, FALSE); // Set small icon *&d>Vk."]  
 m_Key.SetCurSel(0); Nzo;j0 [  
 RegisterHotkey(); ^J TrytIB  
 CMenu* pMenu=GetSystemMenu(FALSE); [K\Vc9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); B3j   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m4<5jC`-M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [f?fA[, [  
 return TRUE; // return TRUE unless you set the focus to a control X(`wj~45VX  
} );]9M~$  
Cmsg'KqqT  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J ^y1=PM  
{ IYo{eX~=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =u5a'bp0;;  
 { 9uNkd2 #  
  CAboutDlg dlgAbout; kma)DW  
  dlgAbout.DoModal(); /5l"rni   
 } GbLuX U  
 else 1TagQ  
 { <yw6Om:n<  
  CDialog::OnSysCommand(nID, lParam); xE2sb*  
 } 8K]5fkC|  
} =nQgS.D  
"zn<\z$l  
void CCaptureDlg::OnPaint() * 7<{Xbsj^  
{ 0I`)<o-  
 if (IsIconic()) /oWn0  
 { .}wVM`81z  
  CPaintDC dc(this); // device context for painting q, 8TOn  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oV(|51(f  
  // Center icon in client rectangle bI_6';hq!  
  int cxIcon = GetSystemMetrics(SM_CXICON); )dv w.X  
  int cyIcon = GetSystemMetrics(SM_CYICON); _5nS!CN  
  CRect rect; 8%@![$q<g  
  GetClientRect(&rect); aw\\oN*  
  int x = (rect.Width() - cxIcon + 1) / 2; LR:v$3 G(  
  int y = (rect.Height() - cyIcon + 1) / 2; a+U^mPe  
  // Draw the icon *WHQ1geI8  
  dc.DrawIcon(x, y, m_hIcon); V+A9.KoI  
 } n7J6YtUwP  
 else eVXlQO  
 { 7O=N78M  
  CDialog::OnPaint(); bp>-{Nv  
 } ;yvx-  
} m>H+noc^  
Hd/|f;  
HCURSOR CCaptureDlg::OnQueryDragIcon() YT*_ vmJV  
{ [eb?Fd~WB]  
 return (HCURSOR) m_hIcon; s#8mD !T|  
} pdz_qj!Z  
d3m!34ml  
void CCaptureDlg::OnCancel() '@ $L}C#OI  
{ o*[n[\cR  
 if(bTray) kK0.j)(  
  DeleteIcon(); Q|DVB  
  CDialog::OnCancel(); e={X{5z0  
} xzZ2?z Wi  
T uk:: .jD  
void CCaptureDlg::OnAbout() qy9RYIfZ  
{ rwJCVkF  
 CAboutDlg dlg; lR[]A  
 dlg.DoModal(); (mNNTMe  
} 8(6(,WwP}  
<WHu</  
void CCaptureDlg::OnBrowse() A>?_\<Gp  
{ j5rB+  
 CString str; am'11a@*  
 BROWSEINFO bi; TbUouoc  
 char name[MAX_PATH]; Qb.Ve7c  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  .J0Tn,m  
 bi.hwndOwner=GetSafeHwnd(); XTibx;yd<  
 bi.pszDisplayName=name; uPmK:9]3R  
 bi.lpszTitle="Select folder"; gPW% *|D,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u6B,V  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); o4^|n1vN  
 if(idl==NULL) kK,Ne%}a2K  
  return; V!{}%;f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fj7\MTy  
 str.ReleaseBuffer(); vhEqHjR:  
 m_Path=str; 2`Ojw_$W7  
 if(str.GetAt(str.GetLength()-1)!='\\') =ObI  
  m_Path+="\\"; 3Uy48ue  
 UpdateData(FALSE); 8p;|&7  
} iF_#cmSy$  
3tt3:`g  
void CCaptureDlg::SaveBmp() f"{|c@%  
{ KBe\)Vs  
 CDC dc; '{[n,xeR  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]T?Py)  
 CBitmap bm; 8JFns-5  
 int Width=GetSystemMetrics(SM_CXSCREEN); <Lt%[dn  
 int Height=GetSystemMetrics(SM_CYSCREEN); yx@%x?B  
 bm.CreateCompatibleBitmap(&dc,Width,Height); MJzY|  
 CDC tdc; At0ahy+  
 tdc.CreateCompatibleDC(&dc); _s1pif  
 CBitmap*pOld=tdc.SelectObject(&bm); Jp d|<\Ml  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F3%8E<QZd;  
 tdc.SelectObject(pOld); _K4E6c_  
 BITMAP btm; 7xhBdi[ dQ  
 bm.GetBitmap(&btm); ,Vc>'4E-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I<``d Ne9Q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9tMaOm  
 BITMAPINFOHEADER bih; ^%qe&Pe2  
 bih.biBitCount=btm.bmBitsPixel; :pp@x*uNP  
 bih.biClrImportant=0; Fu z'!  
 bih.biClrUsed=0; &(Yv&j X  
 bih.biCompression=0; SyB2A\A  
 bih.biHeight=btm.bmHeight; Fad.!%[  
 bih.biPlanes=1; mRNA,*  
 bih.biSize=sizeof(BITMAPINFOHEADER); mr 6~8 I  
 bih.biSizeImage=size; EZY <k#  
 bih.biWidth=btm.bmWidth; P,eP>55'K  
 bih.biXPelsPerMeter=0; 4eRV?tE9  
 bih.biYPelsPerMeter=0; 2m*g,J?ql  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (\I9eBm  
 static int filecount=0; pef)c,U$  
 CString name; _<8~CWo:  
 name.Format("pict%04d.bmp",filecount++); qDV t  
 name=m_Path+name; @mJ# ~@*(  
 BITMAPFILEHEADER bfh; e2dg{n$6"  
 bfh.bfReserved1=bfh.bfReserved2=0; f i_'Ny>#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 38 -vt,|  
 bfh.bfSize=54+size; eXYf"hU,  
 bfh.bfOffBits=54; !bq3c(d  
 CFile bf; B1U<m=Y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sU=7)*$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vg"$&YX9"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Z w`9B  
  bf.WriteHuge(lpData,size); \se /2l  
  bf.Close(); MmbS ["A  
  nCount++; Y6Mp[=  
 } C9FzTg/c  
 GlobalFreePtr(lpData); vT&) 5nN  
 if(nCount==1) ;usR=i36b  
  m_Number.Format("%d picture captured.",nCount); .,9e~6}  
 else YjR`}rdwo  
  m_Number.Format("%d pictures captured.",nCount); }t FRl  
  UpdateData(FALSE); M}S1Zz%Ii1  
} om1@;u8u  
%FhUjHm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nn?h;KzB  
{ y!kU0  
 if(pMsg -> message == WM_KEYDOWN) e|e"lP  
 { kR !O-@GJ]  
  if(pMsg -> wParam == VK_ESCAPE) 6/=0RTd  
   return TRUE; b)(rlX  
  if(pMsg -> wParam == VK_RETURN) d$gT,+|vu  
   return TRUE; # GbfFoE  
 } }|j \QjH  
 return CDialog::PreTranslateMessage(pMsg); "8#EA<lsS  
} JnY.]:  
KB$S B25m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6]^~yby P  
{ QB"Tlw(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n90DS/Yx  
  SaveBmp(); xe&w.aBI>  
  return FALSE; t9\}!{<s  
} N fBH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2N}UB=J  
 CMenu pop; t8?$q})RL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^D5+ S`V  
 CMenu*pMenu=pop.GetSubMenu(0); tZL {;@  
 pMenu->SetDefaultItem(ID_EXITICON); nc[Kh8N9  
 CPoint pt; xo.k:F  
 GetCursorPos(&pt); iRIO~XVo  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )7jJ3G*  
 if(id==ID_EXITICON) xCYK"v6\  
  DeleteIcon(); 4c'F.0^  
 else if(id==ID_EXIT) i!i=6m.q7  
  OnCancel(); \5pBK  
 return FALSE; TZ+- >CG  
} =H_vRd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (~ `?_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Jmml2?V-c  
 AddIcon(); !zZ3F|+HB  
 return res; 8t5o&8v  
} -FGM>~x  
/7fD;H^*  
void CCaptureDlg::AddIcon() ' 5xvR G  
{ t}wwRWo2?f  
 NOTIFYICONDATA data; dZ,IXA yB  
 data.cbSize=sizeof(NOTIFYICONDATA); wsEOcaie  
 CString tip; Tv6HPD$[  
 tip.LoadString(IDS_ICONTIP); oWb\T 2!m  
 data.hIcon=GetIcon(0); nXT/zfS  
 data.hWnd=GetSafeHwnd(); Fxx -2(U  
 strcpy(data.szTip,tip); PY76;D*`  
 data.uCallbackMessage=IDM_SHELL; 0Lx,qZ'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E'cI}q  
 data.uID=98; 4G3u8)b=  
 Shell_NotifyIcon(NIM_ADD,&data); $}8@?>-w  
 ShowWindow(SW_HIDE); BA6(Owb  
 bTray=TRUE; :%4N4| Q  
} ;@FCa j&  
]J^/`gc  
void CCaptureDlg::DeleteIcon() { u %xc"0y  
{ _O3X;U7rc  
 NOTIFYICONDATA data; 0$BX8?Z  
 data.cbSize=sizeof(NOTIFYICONDATA); 5rH?FQE  
 data.hWnd=GetSafeHwnd(); ^r@,(r6w  
 data.uID=98; `Fx+HIng,  
 Shell_NotifyIcon(NIM_DELETE,&data); H#/Hs#  
 ShowWindow(SW_SHOW); ;-Ki`x.oJ  
 SetForegroundWindow(); ~Z:)Y*  
 ShowWindow(SW_SHOWNORMAL); ufn% sA  
 bTray=FALSE; 7ND4Booul  
} L-DL)8;`  
fl}! V4  
void CCaptureDlg::OnChange() ZKTY1JW_  
{ 8.zYa(< 2  
 RegisterHotkey(); }Y!v"DO#Q*  
} \k9]c3V  
<%N*IE"q  
BOOL CCaptureDlg::RegisterHotkey() n/ZX$?tKAK  
{ -A^o5s  
 UpdateData(); jRN>^Ur;g  
 UCHAR mask=0; !B v.@~  
 UCHAR key=0; +yI2G! $T9  
 if(m_bControl) @+7CfvM  
  mask|=4; ~5>k_\ G8  
 if(m_bAlt) D4O^5?F)|  
  mask|=2; )8`i%2i=  
 if(m_bShift) -)Hc^'.  
  mask|=1; {_R{gpj'  
  key=Key_Table[m_Key.GetCurSel()]; Ei4Iv#Oi`  
 if(bRegistered){ 7nPjeh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <<PXh&wu0  
  bRegistered=FALSE; S1o[)q   
 } }z F,dst  
 cMask=mask; #Q"04'g  
 cKey=key; ( TJGJY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9Cs/B*3)b  
 return bRegistered; g=$nNQ \6=  
} (tCBbPW6T?  
zSagsH |W  
  四、小结 *Ksk1T+>  
'<U4D  
  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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