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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: -_xTs(;|8  
  Mtl`A'KQ/K  
  一、实现方法 I<Cm$8O?  
l,6' S8=  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:  1p K(tm  
Q/@ pcU  
#pragma data_seg("shareddata") d/3bE*gr  
HHOOK hHook =NULL; //钩子句柄 n/Dg)n?  
UINT nHookCount =0; //挂接的程序数目 e,xJ%f  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 PM i.)%++  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {Mb2X^@7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bXvriQ.UH  
static int KeyCount =0; EERCb%M 8Z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !UR3`Xk  
#pragma data_seg() 0 . UN  
9K;g\? 3  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 F~0iJnF  
M6ZXq6J  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >;]S+^dXY  
Hh%"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR i%GiWanG  
cKey,UCHAR cMask) Z`f?7/"B  
{ /U,(u9bq  
 BOOL bAdded=FALSE; u aYI3w@^  
 for(int index=0;index<MAX_KEY;index++){ 1Vkb}A,'  
  if(hCallWnd[index]==0){ [wk1p-hf  
   hCallWnd[index]=hWnd; x:i,l:x  
   HotKey[index]=cKey; V["'eJA,,  
   HotKeyMask[index]=cMask; n!sOKw  
   bAdded=TRUE; qC=9m[MI  
   KeyCount++; 37biRXqLH  
   break; aTfc>A;  
  } .:XXc  
 } g\9&L/xDN  
 return bAdded; m7`S@qG  
} )6BySk  
//删除热键 Lxn-M5RPQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (/^?$~m"  
{ S'`G7ht  
 BOOL bRemoved=FALSE; |'lNR)5  
 for(int index=0;index<MAX_KEY;index++){ -aLM*nIoe  
  if(hCallWnd[index]==hWnd){ ]yQqx*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ tSY4'  
    hCallWnd[index]=NULL; \vx'+}  
    HotKey[index]=0; "!& o|!2  
    HotKeyMask[index]=0; 5R)IL 2~  
    bRemoved=TRUE; MskO Pg  
    KeyCount--; lKf kRyO_S  
    break; nVrV6w  
   } PbY.8d%2/k  
  } $2Awp@j  
 } 8#R%jjr%T  
 return bRemoved; G({5LjgW  
} @=}NMoNH  
w#_7,*6]  
qY!LzKM0  
  DLL中的钩子函数如下: C8do8$  
eY%Ep=J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JvEW0-B^l,  
{ 3UF^Ff<wo  
 BOOL bProcessed=FALSE; EuA352x  
 if(HC_ACTION==nCode) ?9 W2ax-4  
 { eoFG$X/PO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 dNCd-ep  
   switch(wParam) 's5H_ah  
   {  K47.zu  
    case VK_MENU: ,<C~DSAyZ  
     MaskBits&=~ALTBIT; [vz2< genn  
     break; ?)[=>Kp  
    case VK_CONTROL: Sj:c {jyJd  
     MaskBits&=~CTRLBIT; GY5JPl  
     break; xOr"3;^  
    case VK_SHIFT: O>I%O^  
     MaskBits&=~SHIFTBIT; +3M1^:  
     break; a^^OI|?  
    default: //judge the key and send message {u0sbb(  
     break;  $C,` ^n'  
   } \rT>&o .i  
   for(int index=0;index<MAX_KEY;index++){ 0C3Y =F  
    if(hCallWnd[index]==NULL) >p#_ L^oZ%  
     continue; OlptO60{ ]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D+N@l"U{  
    { _RS CyV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f =A#:d  
     bProcessed=TRUE; \ [M4[Qlq  
    } "rc QS H  
   } ,&s"f4Mft  
  } RQu[FZT,  
  else if((lParam&0xc000ffff)==1){ //有键按下 [z*1#lj S  
   switch(wParam) 0+)1K U)I  
   { @ *uZ+$  
    case VK_MENU: D51s)?  
     MaskBits|=ALTBIT; Z^Wv(:Nr  
     break; J9f]=1`  
    case VK_CONTROL: [g}0.J`_  
     MaskBits|=CTRLBIT; ![eY%2;<  
     break; 1bDAi2 H  
    case VK_SHIFT: &LG|YvMY6  
     MaskBits|=SHIFTBIT; eYn/F~5-  
     break; f+.sm  
    default: //judge the key and send message +QOK]NJN  
     break; YG5mzP<T  
   } {$ pi};  
   for(int index=0;index<MAX_KEY;index++){ 4H@7t,>  
    if(hCallWnd[index]==NULL) UZ6y3%G3^  
     continue; ~Y;Z5e=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _;/+8=  
    { (]VY==t~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7VdxQ T  
     bProcessed=TRUE; ] yWywa\  
    } D{q r N6g#  
   } Z N&9qw*  
  } A;6ew4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )3V1aC  
   for(int index=0;index<MAX_KEY;index++){ XeslOsHh  
    if(hCallWnd[index]==NULL) .eorwj]yb  
     continue; l>hvWK[ ?I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '#oH1$W]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^ 4p$@5zH  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 " YOl6n  
   } H(O|y2   
  } 0QW;=@)d  
 } ($8!r|g5#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f)V6VNW.3  
} d+5v[x~'  
$" =3e]<  
  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: ka{!' ^  
Mhb~wDQl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k9NHdi7&2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [r9HYju =  
: w>R|]  
  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((KAl]dL  
i=hA. y`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -6X+:r`>u  
{ zz<o4b R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) T-x9IoE  
 { l1 _"9a%H  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ux 17q>G  
  SaveBmp(); T[g(S0dz  
  return FALSE; B5R7geC  
 } ?%D nIl>  
 …… //其它处理及默认处理 Z^%HDB9^  
} 0Pt% (^  
dQAF;L  
{Q`Q2'@  
  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。 QF22_D<.}J  
0HQTe>!  
  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。 b&d4(dk  
*iyc,f^w  
  二、编程步骤 jR+k x:+  
NSR][h_  
  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"; #BgiDLh  
+CXq41g"c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {d)L0KXK  
hvA|d=R(  
  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; m%.[|sZ3EM  
gO@LJ  
  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; uu>R)iTQ%S  
Zw<<p|{)<  
  5、 添加代码,编译运行程序。 ?+%bEZ`  
N| P?!G-=  
三、程序代码 FF|M7/[~  
[o7Qr?RN  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =+[` 9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) F[)tg#}@G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g&8-X?^Q  
#if _MSC_VER > 1000 tbfwgK  
#pragma once q]s_hWWv  
#endif // _MSC_VER > 1000 t\v~ A0  
#ifndef __AFXWIN_H__ *<h)q)HS  
#error include 'stdafx.h' before including this file for PCH ~~m(CJ4S  
#endif =8"xQ>D62  
#include "resource.h" // main symbols r029E-  
class CHookApp : public CWinApp 0< }BSv  
{ ,,Ivey!kL  
 public: d7:=axo,  
  CHookApp(); Ka%#RNW  
  // Overrides i.KRw6  
  // ClassWizard generated virtual function overrides Qv]rj]%  
  //{{AFX_VIRTUAL(CHookApp) hDBo XIK  
 public: QR<<O  
  virtual BOOL InitInstance(); `}FZ;q3DP  
  virtual int ExitInstance(); /*GCuc|  
  //}}AFX_VIRTUAL Y'#uZA3KA  
  //{{AFX_MSG(CHookApp) :oiHf:  
  // NOTE - the ClassWizard will add and remove member functions here. %&s4YD/{  
  // DO NOT EDIT what you see in these blocks of generated code ! {K:] dO  
  //}}AFX_MSG 2 i NZz  
  DECLARE_MESSAGE_MAP() K `A8N  
}; qG]0z_dPE~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]*Kv[%r07c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9oG)\M.6w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \6aisK  
BOOL InitHotkey(); =Tfm~+7nE  
BOOL UnInit(); T`]P5Bk8r  
#endif 1S yG  
dx$+,R~y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O]j<$GG!  
#include "stdafx.h" d b *J  
#include "hook.h" #3A|Z=,5  
#include <windowsx.h> *D1vla8  
#ifdef _DEBUG 1 (e64w@  
#define new DEBUG_NEW .SNg2.  
#undef THIS_FILE EW+QVu@  
static char THIS_FILE[] = __FILE__; >t%@)]*N  
#endif  [ A 7{}  
#define MAX_KEY 100 ~)6EH`-  
#define CTRLBIT 0x04 _g'x=VJF  
#define ALTBIT 0x02 A\13*4:;l  
#define SHIFTBIT 0x01 +wI<w|!  
#pragma data_seg("shareddata") 'q@vTM'-  
HHOOK hHook =NULL; Q-1 Xgw!  
UINT nHookCount =0; aY6F4,7/B  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %7?Z|'\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8`90a\t'Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zw iS%-F  
static int KeyCount =0; <|w(Sn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d"Zyc(Jk  
#pragma data_seg() c: (nlYZ   
HINSTANCE hins; #]Jg>  
void VerifyWindow(); }d5~w[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) O]Y   z7  
//{{AFX_MSG_MAP(CHookApp) \l`{u)V  
// NOTE - the ClassWizard will add and remove mapping macros here. H?V b   
// DO NOT EDIT what you see in these blocks of generated code! 6)>otB8)J  
//}}AFX_MSG_MAP ofPv?_@  
END_MESSAGE_MAP() y! QYdf?  
,R-aO= %  
CHookApp::CHookApp() P>03 DkbB  
{ b # Llu$  
 // TODO: add construction code here, Lg|d[*;'7  
 // Place all significant initialization in InitInstance /w2-Pgm-[\  
} ,lFp4 C  
9n"MNedqH  
CHookApp theApp; jX^_(Kg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wxT( ktE  
{ QV4FA&f&  
 BOOL bProcessed=FALSE; 4=N(@mS  
 if(HC_ACTION==nCode) 0sB[]E|7[s  
 { a|4Q6Ycu  
  if((lParam&0xc0000000)==0xc0000000){// Key up 'rA(+-.M;  
   switch(wParam) 62K#rR S  
   { bfy=  
    case VK_MENU: !/=.~B  
     MaskBits&=~ALTBIT; zJ@^Bw;A^@  
     break; ntW1 )H'o  
    case VK_CONTROL: S,Tc\}  
     MaskBits&=~CTRLBIT; Aq\K N.  
     break; Ch:EL-L  
    case VK_SHIFT: MV07RjeS  
     MaskBits&=~SHIFTBIT; G&"O)$h  
     break; t+{vb S0  
    default: //judge the key and send message '|<S`,'#hg  
     break; &:1q3 gDm  
   } usC$NVdm  
   for(int index=0;index<MAX_KEY;index++){ '}"&JO~vPj  
    if(hCallWnd[index]==NULL) S0}=uL#dt  
     continue; wN :"(mQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xn,9Wj-  
    { :+"H h%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2gR*]?C*  
     bProcessed=TRUE; 1+YqdDqQ  
    } P+QL||>L  
   } `PSjk F(  
  } Xg* ](>/\,  
  else if((lParam&0xc000ffff)==1){ //Key down V)vik  
   switch(wParam) 8IE^u<H(:  
   { %Y>E  
    case VK_MENU: &So1;RR,_M  
     MaskBits|=ALTBIT; y0~ttfv  
     break; |.L_c"Bc  
    case VK_CONTROL: dlIYzO<  
     MaskBits|=CTRLBIT; 0?dr(   
     break; ia_l P  
    case VK_SHIFT: "M3;>"`G  
     MaskBits|=SHIFTBIT; (t@ :dW  
     break; S5d  
    default: //judge the key and send message \f)GW$`  
     break; 1l Cr?  
   } W+$G{XSr5C  
   for(int index=0;index<MAX_KEY;index++) =%c\<<]aV  
   { PC|ul{[*}  
    if(hCallWnd[index]==NULL) .t/@d(R  
     continue; ,Q0H)// ~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M |f V7g  
    { 4I&Mdt<^D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \O\q1 s~  
     bProcessed=TRUE; l5\V4  
    } QHc([%oV  
   } O%N.;Ve  
  } 8@RtL,[d  
  if(!bProcessed){ (.VS&Kv#U  
   for(int index=0;index<MAX_KEY;index++){ #<EYO  
    if(hCallWnd[index]==NULL) SvrUXf  
     continue; e `OQ6|.k8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tw&v@HUP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5$+ssR_?k  
   } iRbe$v&N  
  } *>1^q9M  
 } 0/9]T Ic  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ivyaGAF}+o  
} _x|.\j  
3!vzkBr  
BOOL InitHotkey() ?~!9\dek,  
{ n?;rWq"  
 if(hHook!=NULL){ xu%eg]  
  nHookCount++; 1<5Ug8q  
  return TRUE; H Ix%c5^  
 } ~_c1h@  
 else n.z,-H17  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); '+27_j  
  if(hHook!=NULL) ${eV3LSC  
   nHookCount++; Q WEE%}\3}  
  return (hHook!=NULL); Ak8Y?#"wz  
} \4^rb?B  
BOOL UnInit() (<8}un  
{ c?u*,d) G  
 if(nHookCount>1){ RS l*u[fB  
  nHookCount--; 7 nFOV Z  
  return TRUE; a^pbBDi W  
 } Jazgn5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); A.dbb'^  
 if(unhooked==TRUE){ 'W yWO^Bdk  
  nHookCount=0; akU2ToP  
  hHook=NULL; 4^M"V5tDx  
 } :O$bsw:3w<  
 return unhooked; OZnKJ<  
} W5=)B`v  
 o?m/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h /^bRs`;  
{ f-71`Pyb  
 BOOL bAdded=FALSE; Qh(X7B  
 for(int index=0;index<MAX_KEY;index++){ I.GoY[u_%  
  if(hCallWnd[index]==0){ x5mg<y2`Ng  
   hCallWnd[index]=hWnd; nw0#gDI|  
   HotKey[index]=cKey; /of K7/  
   HotKeyMask[index]=cMask; %yu =,J j  
   bAdded=TRUE; $Ery&rX.  
   KeyCount++; ovBmo2W/  
   break; xLDD;Qm,  
  } g\ vT7x  
 } tiHR&v  
 return bAdded; _lFw1pa#\  
} l $"hhI8  
$2?j2}M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fe,6YXUf  
{ =I)43ah d  
 BOOL bRemoved=FALSE; ~~ rR< re  
 for(int index=0;index<MAX_KEY;index++){ (6Z^0GL  
  if(hCallWnd[index]==hWnd){ +E_yEH7_)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {svo!pN:  
    hCallWnd[index]=NULL; 46Sz#^y P  
    HotKey[index]=0; {G VA4=UAE  
    HotKeyMask[index]=0; s&(;  
    bRemoved=TRUE; y,3ZdY"  
    KeyCount--; qS FtQ4  
    break; jWv'`c  
   } Np/\ }J&IF  
  } Zo yO[#  
 } n=vDEX:'  
 return bRemoved; *{!Y_FrL  
} fzQR0  
$R1I(sJ  
void VerifyWindow() ,0 q1Id  
{ ]MosiMJF  
 for(int i=0;i<MAX_KEY;i++){ h0@a"DqK  
  if(hCallWnd!=NULL){ f$ xp74hw3  
   if(!IsWindow(hCallWnd)){ @XV&^l -  
    hCallWnd=NULL; ACdPF_Y]  
    HotKey=0; h%Nd89//  
    HotKeyMask=0; ,7]hjf_h  
    KeyCount--; A>1$?A8Q  
   } O9(z"c  
  } I}3F'}JV<  
 } %BP>,E/w  
} ,_I rE  
I /MY4?(T  
BOOL CHookApp::InitInstance() bYnq,JRA  
{ $2?AJ/2r$b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0f.j W O  
 hins=AfxGetInstanceHandle(); <ak[`]  
 InitHotkey(); q!eE~O;A  
 return CWinApp::InitInstance(); aQtd6L+ J  
} @wI>0B  
Aj4 a-vd.  
int CHookApp::ExitInstance() `KFEzv  
{ 8b)WOr6n  
 VerifyWindow();  JhFbze>  
 UnInit(); 1x:W 3.  
 return CWinApp::ExitInstance(); \}s/<Q  
} !i^"3!.l,]  
2Lf,~EV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D=TS IJ@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5mD8$% \8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7"!b5(4=  
#if _MSC_VER > 1000 'bi;Y1:  
#pragma once dm4Q'u  
#endif // _MSC_VER > 1000 ` 3qf}=Z`  
<m]0!ii  
class CCaptureDlg : public CDialog d-D,Gx]>$  
{ i}sAF/  
 // Construction G`Nw]_ Z_  
 public: m9DFnk<D  
  BOOL bTray; }kqh[`:  
  BOOL bRegistered; 3ic /xy;}  
  BOOL RegisterHotkey(); w`)5(~b  
  UCHAR cKey; W2 -%/  
  UCHAR cMask; nn_O"fZi  
  void DeleteIcon(); ]?tRO  
  void AddIcon(); =9GA LoGL  
  UINT nCount; Q&eyqk   
  void SaveBmp(); $^ee~v;m4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor tDX& ~1s  
  // Dialog Data pj$JA  
  //{{AFX_DATA(CCaptureDlg) qk2E>  
  enum { IDD = IDD_CAPTURE_DIALOG }; <+oh\y16  
  CComboBox m_Key; \9)5b8  
  BOOL m_bControl; Hd|[>4Z  
  BOOL m_bAlt; <l{oE? N  
  BOOL m_bShift; ub-3/T  
  CString m_Path; [a2]_]E%  
  CString m_Number; b>; ?{  
  //}}AFX_DATA | ys5.|  
  // ClassWizard generated virtual function overrides H5}61JC/z  
  //{{AFX_VIRTUAL(CCaptureDlg) 'f\9'v  
 public: g"m' C6;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Zv;nY7B  
 protected: h;gc5"mG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {aY) Qv}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /iU<\+ H  
  //}}AFX_VIRTUAL TTz=*t+D  
  // Implementation ]y_ :+SHc  
 protected: Z-PB CU  
  HICON m_hIcon; '~D4%WKT  
  // Generated message map functions J\L'HIs  
  //{{AFX_MSG(CCaptureDlg) Vp/XVyL}R  
  virtual BOOL OnInitDialog(); i%K6<1R;y{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3^7+fxYWo  
  afx_msg void OnPaint(); oMQ4q{&|  
  afx_msg HCURSOR OnQueryDragIcon(); z1J)./BO  
  virtual void OnCancel(); >1j#XA8  
  afx_msg void OnAbout(); \,Y .5?  
  afx_msg void OnBrowse(); 8G:/f3B=  
  afx_msg void OnChange(); msBoInhI  
 //}}AFX_MSG MzIDeZ  
 DECLARE_MESSAGE_MAP() EN!C5/M{&  
}; g,Ob/g8uc  
#endif .q9Sg8G  
3Z XAAV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file dy&G~F28  
#include "stdafx.h" |>;PV4])(  
#include "Capture.h" ,*|Q=  
#include "CaptureDlg.h" Nk7y2[  
#include <windowsx.h> Q,3kaR@O  
#pragma comment(lib,"hook.lib") |?T=4~b  
#ifdef _DEBUG Ei!Z]jeK  
#define new DEBUG_NEW os/h~,=  
#undef THIS_FILE \l GD8@,x  
static char THIS_FILE[] = __FILE__; zZCl]cql  
#endif 1K Fd ~U  
#define IDM_SHELL WM_USER+1 J&A1]T4d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u7< +)6-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1 /M^7Vb.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g04^M (  
class CAboutDlg : public CDialog &-=~8  
{ v"k ? e  
 public: D6bYg `  
  CAboutDlg(); N~!, S;w  
  // Dialog Data KuJ)alD;1  
  //{{AFX_DATA(CAboutDlg) $JY \q2  
  enum { IDD = IDD_ABOUTBOX }; 50_[hC&C)  
  //}}AFX_DATA ?X|)0o  
  // ClassWizard generated virtual function overrides *Jsb~wta  
  //{{AFX_VIRTUAL(CAboutDlg) p1UloG\  
 protected: ;J W ]b]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y$JVxly  
  //}}AFX_VIRTUAL w/#7G\U  
  // Implementation ^#R`Uptib  
 protected: #/YS  
  //{{AFX_MSG(CAboutDlg) =8]`-(  
  //}}AFX_MSG >=N-P< %  
  DECLARE_MESSAGE_MAP() wkp2A18n  
}; fpf]qQ W~7  
|m's)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ch"wp/[  
{ IWo'{pk  
 //{{AFX_DATA_INIT(CAboutDlg) 3yx[*'e$  
 //}}AFX_DATA_INIT sC3Vj(d!i  
} w9|x{B  
);!ND %  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -Lq+FTezE  
{ 7i"b\{5  
 CDialog::DoDataExchange(pDX); V(`]hH0;T  
 //{{AFX_DATA_MAP(CAboutDlg) _# {*I(l  
 //}}AFX_DATA_MAP ~R|9|k  
} N@|<3R!N*e  
[<XYU,{R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6{)pF  
 //{{AFX_MSG_MAP(CAboutDlg) _^_3>}y5op  
 // No message handlers og";mC  
 //}}AFX_MSG_MAP "l&SRX?g  
END_MESSAGE_MAP() `rn/H;r!Z  
R'gd/.[e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nD5wN~[J  
: CDialog(CCaptureDlg::IDD, pParent) @rGY9%E  
{ &2W"4SE]6  
 //{{AFX_DATA_INIT(CCaptureDlg) V?EX`2S  
  m_bControl = FALSE; mu\1hKq;B  
  m_bAlt = FALSE; f-M:ap(O  
  m_bShift = FALSE; $OZ= L  
  m_Path = _T("c:\\"); gAqK/9;  
  m_Number = _T("0 picture captured."); 63E6nW M  
  nCount=0; $#rkvG_w  
  bRegistered=FALSE; qm=U<'b^  
  bTray=FALSE;  xL15uWk-  
 //}}AFX_DATA_INIT *O[/KR%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B?B OAH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UNDl&C2vz  
} p$,G`'l  
}#s{."  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {F<0e^*  
{ 2Hd\>{*  
 CDialog::DoDataExchange(pDX); /l<(i+0  
 //{{AFX_DATA_MAP(CCaptureDlg) Vit-)o{zr  
  DDX_Control(pDX, IDC_KEY, m_Key); EV( F!&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); n3p@duC4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )%^l+w+&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); RI*n]HNgy+  
  DDX_Text(pDX, IDC_PATH, m_Path); =AO (  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]njNSn  
 //}}AFX_DATA_MAP mh8fJ6j29N  
} u[**,.Ecg  
gY7sf1\wX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) EK# 11@0%  
//{{AFX_MSG_MAP(CCaptureDlg) Phi5;U!  
 ON_WM_SYSCOMMAND() QD7KE6KP'  
 ON_WM_PAINT() =DdPwr 0Op  
 ON_WM_QUERYDRAGICON() cvsH-uAp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -*7i:mg  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) VJ\qp%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +c% jOl  
//}}AFX_MSG_MAP T+L=GnYl  
END_MESSAGE_MAP() OJu>#   
#e@NV4q  
BOOL CCaptureDlg::OnInitDialog() #QFz /6  
{ 9\EW~OgTu  
 CDialog::OnInitDialog(); }.o.*N  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AE:(:U\  
 ASSERT(IDM_ABOUTBOX < 0xF000); c!E{fSP  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *+rfRH]a  
 if (pSysMenu != NULL) AO5&Y.A#  
 { |tAkv  
  CString strAboutMenu; ymm]+v5S.]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); dU9;sx  
  if (!strAboutMenu.IsEmpty()) _&]7  
  { 6 rnFXZ\  
   pSysMenu->AppendMenu(MF_SEPARATOR); Md4Q.8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;+DEU0|pe  
  } ^`!+7!  
 } ^'=[+  
 SetIcon(m_hIcon, TRUE); // Set big icon ))AxU!*.  
 SetIcon(m_hIcon, FALSE); // Set small icon l<1zLA~G  
 m_Key.SetCurSel(0); ]$drBk86bh  
 RegisterHotkey(); x\'3UKQP+^  
 CMenu* pMenu=GetSystemMenu(FALSE); RNc:qV<H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7G+!9^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S*<Jy(:n  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Tz)Ku  
 return TRUE; // return TRUE unless you set the focus to a control |m KohV qr  
} <%YW/k"o  
`<g]p-=":  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) PPl o0R  
{ T'}kCnp  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -F?97&G$  
 { q;[HUyY,  
  CAboutDlg dlgAbout; $9?:P}$v  
  dlgAbout.DoModal(); CF>&mXg\  
 } +IS6l*_y>6  
 else )P7ep  
 { .I>rX#aNt  
  CDialog::OnSysCommand(nID, lParam); 'dWUE-  
 } )Lz =[e  
} se.HA  
2V]a+Cgk  
void CCaptureDlg::OnPaint() \i+AMduAo  
{ EPJ>@A>;D  
 if (IsIconic()) `V9bd}M%~;  
 { d:hnb)I$*  
  CPaintDC dc(this); // device context for painting .#~!w!T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8XYxyOl  
  // Center icon in client rectangle "*HM8\  
  int cxIcon = GetSystemMetrics(SM_CXICON); FaCW +9B  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0 7Yak<+~  
  CRect rect; w)|9iL8  
  GetClientRect(&rect); pfZ[YC-  
  int x = (rect.Width() - cxIcon + 1) / 2; ^.:&ZsqV  
  int y = (rect.Height() - cyIcon + 1) / 2; >>$L vQ  
  // Draw the icon &jY| :Fe  
  dc.DrawIcon(x, y, m_hIcon); %T$>E7]!  
 } 3Iqvc v  
 else F m:Ys](  
 { @U!&XZ]h  
  CDialog::OnPaint(); %~:\f#6  
 } LCSvw  
} G%k&|  
:xHKbWz6j  
HCURSOR CCaptureDlg::OnQueryDragIcon() :rM2G@{  
{ ,Z @I" &H  
 return (HCURSOR) m_hIcon; eyh}O  
} 0rL.~2)V  
Lxv;[2XsW)  
void CCaptureDlg::OnCancel() wlP3 XF?  
{ o@N[O^Q V  
 if(bTray) _`p-^ I  
  DeleteIcon(); C[.Xi  
  CDialog::OnCancel(); C$0u-Nx8  
} bM"?^\a&Q  
/:]<z6R  
void CCaptureDlg::OnAbout() U\Y0v.11  
{ L+G0/G}O\  
 CAboutDlg dlg; ?,x\46]>_K  
 dlg.DoModal(); QDW,e]A  
} TgjjwcO Y  
c $r"q :\  
void CCaptureDlg::OnBrowse() E[#VWM I  
{ %0 {_b68x  
 CString str; x*:VE57,z  
 BROWSEINFO bi; EUs9BJFP  
 char name[MAX_PATH]; :l"B NT[/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U"/T`f'H z  
 bi.hwndOwner=GetSafeHwnd(); ^[.}DNR95(  
 bi.pszDisplayName=name; <[n:Ij  
 bi.lpszTitle="Select folder"; 05{}@tW-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =v^#MU{k?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); C-S>'\ |8  
 if(idl==NULL) xTu J~$(  
  return; m-$}'mEO  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EpO2%|@  
 str.ReleaseBuffer(); @5wc 3y  
 m_Path=str; "f 89   
 if(str.GetAt(str.GetLength()-1)!='\\') CyLwCS{V\  
  m_Path+="\\"; d+G%\qpzQ  
 UpdateData(FALSE); @:RoYvk$  
} Dqo#+_v  
X+sKG5nS  
void CCaptureDlg::SaveBmp() UapU:>!"`  
{ R~iv%+  
 CDC dc; IagM#}m@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); J*b Je"8  
 CBitmap bm; '*L6@e#U  
 int Width=GetSystemMetrics(SM_CXSCREEN); M.,DXEZT  
 int Height=GetSystemMetrics(SM_CYSCREEN); )V~=B]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s}". po]  
 CDC tdc; fZ &  
 tdc.CreateCompatibleDC(&dc); x#3*C|A  
 CBitmap*pOld=tdc.SelectObject(&bm); u; KM[FmK  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LDEc}XXb  
 tdc.SelectObject(pOld); qD*y60~]zz  
 BITMAP btm; .-iW T4Dn  
 bm.GetBitmap(&btm); [/q Bvuun  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sQA_6]`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); AB\Ya4O"9  
 BITMAPINFOHEADER bih; 2DPv7\fW  
 bih.biBitCount=btm.bmBitsPixel; RHBQgD$  
 bih.biClrImportant=0; &-qQF`7  
 bih.biClrUsed=0; m W>Iib|  
 bih.biCompression=0; >v, si].  
 bih.biHeight=btm.bmHeight; pl3ap(/  
 bih.biPlanes=1; }\S'oC\[  
 bih.biSize=sizeof(BITMAPINFOHEADER); zMA;1Na  
 bih.biSizeImage=size; e`b#,=  
 bih.biWidth=btm.bmWidth; { rLgyrj$  
 bih.biXPelsPerMeter=0; xE;O =mI  
 bih.biYPelsPerMeter=0; b MD|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &kzysv-_  
 static int filecount=0; 66F?exr  
 CString name; 5b/ ~]v  
 name.Format("pict%04d.bmp",filecount++); -t S\  
 name=m_Path+name; :,JjN&  
 BITMAPFILEHEADER bfh; B VeMV4  
 bfh.bfReserved1=bfh.bfReserved2=0; `dcz9 *  
 bfh.bfType=((WORD)('M'<< 8)|'B'); }R 16WY_'  
 bfh.bfSize=54+size; ;6``t+]q   
 bfh.bfOffBits=54; Z6${nUX  
 CFile bf; kd!?N  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8cOft ;|qB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oDu6W9+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %H\J@{f  
  bf.WriteHuge(lpData,size); }NyQ<,+mq&  
  bf.Close(); u$^tRz9  
  nCount++; WN=0s  
 } 0D2I)E72o  
 GlobalFreePtr(lpData); 8u~  
 if(nCount==1) -O\i^?lD;  
  m_Number.Format("%d picture captured.",nCount); nyi!D   
 else }~+,x#  
  m_Number.Format("%d pictures captured.",nCount); #at`7#K@  
  UpdateData(FALSE); T 'c39  
} B2j1G JEO  
-c]AS[(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DNq(\@x[!  
{ }r@dZ Bp:  
 if(pMsg -> message == WM_KEYDOWN) e^\e;>Dh>  
 { 1}a4AGAp  
  if(pMsg -> wParam == VK_ESCAPE) R]X 0D.  
   return TRUE; vb]kh _  
  if(pMsg -> wParam == VK_RETURN) uEJ8Lmi  
   return TRUE; #PD6LO  
 } <9ucpV  
 return CDialog::PreTranslateMessage(pMsg); o5a=>|?p>  
} 7xeqs q  
YS^!'IyG/B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O_1[KiZ  
{ ?nW>' z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T#-;>@a}  
  SaveBmp(); la+Cra&xL  
  return FALSE; mF\!~ag|  
} a)ry}E =f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]7Vg9&1`  
 CMenu pop; ;9OhK71}  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TC/c5:)]  
 CMenu*pMenu=pop.GetSubMenu(0); A_9^S!  
 pMenu->SetDefaultItem(ID_EXITICON); WuU wd#e  
 CPoint pt; uRko[W(  
 GetCursorPos(&pt); 1`7zYW&L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "QdK Md  
 if(id==ID_EXITICON) To>,8E+GAb  
  DeleteIcon(); nte?a e  
 else if(id==ID_EXIT) K#Ck,Y"  
  OnCancel(); lcZ.}   
 return FALSE; DO80HS3ZD  
} =|agW.l  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~I5hV}ZT  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~)ys,Q  
 AddIcon(); m@Yc&M~  
 return res; \i_E}Ii0  
} .^{%hc*w4  
WChP,hw  
void CCaptureDlg::AddIcon() hNN[djR  
{ /dYv@OU?  
 NOTIFYICONDATA data; p@G7}'|eyA  
 data.cbSize=sizeof(NOTIFYICONDATA); nU_O|l9  
 CString tip; 5&n{QE?Um  
 tip.LoadString(IDS_ICONTIP); OtqFI!ns  
 data.hIcon=GetIcon(0); {3`385  
 data.hWnd=GetSafeHwnd(); 4uIYX  
 strcpy(data.szTip,tip); EpAgKzVpJ  
 data.uCallbackMessage=IDM_SHELL; Z71m(//*}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e7U\gtZ.  
 data.uID=98; {zAI-?#*u  
 Shell_NotifyIcon(NIM_ADD,&data); qazA,|L!  
 ShowWindow(SW_HIDE); +\Vm t[v  
 bTray=TRUE; RHC ZP  
} mF*x&^ie  
~+dps i  
void CCaptureDlg::DeleteIcon() o]oiJvOr  
{ &+2l#3}  
 NOTIFYICONDATA data; ,_3hbT8Q  
 data.cbSize=sizeof(NOTIFYICONDATA); tz@MZs09  
 data.hWnd=GetSafeHwnd(); 1.!U{>$  
 data.uID=98; }9S}?R  
 Shell_NotifyIcon(NIM_DELETE,&data); 0y9 b0G  
 ShowWindow(SW_SHOW); p' >i3T(  
 SetForegroundWindow(); .ImaM  
 ShowWindow(SW_SHOWNORMAL); 4qie&:4j  
 bTray=FALSE; F]3Y,{/V  
} s7Agr!>f  
B`}um;T#~,  
void CCaptureDlg::OnChange() P'Rw/c o  
{ NGc~%0n  
 RegisterHotkey(); Z[. M>|  
} '{d@Gc6.  
B'}?cG]  
BOOL CCaptureDlg::RegisterHotkey() p)IL(_X)  
{ y>a?<*Y+e  
 UpdateData(); QadguV6|  
 UCHAR mask=0; {.:$F3T  
 UCHAR key=0; T^}UE<  
 if(m_bControl) q\6(_U#Tl  
  mask|=4; x z _sejKB  
 if(m_bAlt) 3xChik{  
  mask|=2; IO+]^nY `  
 if(m_bShift) 7QsD"rL  
  mask|=1; j<<d A[X  
  key=Key_Table[m_Key.GetCurSel()]; zU?O)w1'  
 if(bRegistered){ J$3g3%t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w"^h<]b  
  bRegistered=FALSE; K!-OUm5A  
 } IP62|~Ap  
 cMask=mask; ote,`h  
 cKey=key; bHwEd%f  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r`O Yq  
 return bRegistered; c$g@3gL  
} Q7s@,c!m_  
C ^Y\?2h1  
  四、小结 Zl9@E;|=  
WTvUz.Et  
  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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