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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: 5;p|iT  
  |pWu|M _'  
  一、实现方法 eI2HTFyT  
udA@9a^;  
  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: |Rkw/5  
L3xN#W;m7  
#pragma data_seg("shareddata") F;}JSb"  
HHOOK hHook =NULL; //钩子句柄 Cb+$|Kg/"b  
UINT nHookCount =0; //挂接的程序数目 Dv/7 w[F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tp7$t#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #G F.M,O/h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey FjtS  
static int KeyCount =0; BSg T 6K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0+@:f^3]!  
#pragma data_seg() yF.Gz`yi  
F!)[H["_  
  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。 >A-{/"p#  
, h'Q  
  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: 2(l0Lq*  
2z;3NUL$n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR {2P18&=  
cKey,UCHAR cMask) IjRUr\l  
{ 0NZ'(qf~9  
 BOOL bAdded=FALSE; !ae?EJm"  
 for(int index=0;index<MAX_KEY;index++){ W4d32+V  
  if(hCallWnd[index]==0){ #!UJY%c ~  
   hCallWnd[index]=hWnd; w->Y92q]  
   HotKey[index]=cKey; t^YtP3`?b  
   HotKeyMask[index]=cMask; *P`wuXn}  
   bAdded=TRUE; $o5i15Oy.  
   KeyCount++; X5[t6q!  
   break; ki@C}T5  
  } wyB]!4yy,  
 } .qZz 'Eq[  
 return bAdded; Y8v[kuo7  
} Y]0c%Fd  
//删除热键 #.HnO_sK_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'hBnV xd&  
{ X coPkW  
 BOOL bRemoved=FALSE; |a#ikY _nd  
 for(int index=0;index<MAX_KEY;index++){ f7Nmvla[q  
  if(hCallWnd[index]==hWnd){ S 4 17.n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @XzfuuE]  
    hCallWnd[index]=NULL; l_:P |  
    HotKey[index]=0; }l$zZ>.\H  
    HotKeyMask[index]=0; j0{`7n  
    bRemoved=TRUE; <zn)f@W  
    KeyCount--; !fn%Q'S  
    break; 7A(4`D J  
   } zqNzWX  
  } @#,/6s7?  
 } 6X h7Bx1  
 return bRemoved; T&pCLvkz  
} t}h(j|  
&>+T*-'  
Ah7"qv'L\  
  DLL中的钩子函数如下:  eu$VKLY*  
L QV@]z&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zu @|"f^`  
{ $aJay]F  
 BOOL bProcessed=FALSE; P`Ku. ONQ  
 if(HC_ACTION==nCode) U3:|!CC)T  
 { i:jXh9+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 # f-hI  
   switch(wParam) Y(7&3+'K  
   {  \HzmhQb+m  
    case VK_MENU: "0;WYw?  
     MaskBits&=~ALTBIT; \os"w "  
     break; @PNgqjd  
    case VK_CONTROL: =h-E N_[  
     MaskBits&=~CTRLBIT; 7!jb  
     break; @B >D>B  
    case VK_SHIFT: us|Hb  
     MaskBits&=~SHIFTBIT; _4Eq_w`  
     break; 8h=m()Eu  
    default: //judge the key and send message UwS7B~  
     break; '1b8>L  
   } )JTQZ,f3]  
   for(int index=0;index<MAX_KEY;index++){ RDDA^U7y#  
    if(hCallWnd[index]==NULL) >fP;H}S6  
     continue; o#wly%i')  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |A*4Fuc&  
    { hv#$Zo<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QjSWl,{ $D  
     bProcessed=TRUE; ~Oq _lM  
    } l59\Lo:  
   } zC)JOykI%  
  } ~3gazTe9  
  else if((lParam&0xc000ffff)==1){ //有键按下 Jb*QlsGd  
   switch(wParam) T:{&e WH  
   { !6X6_ +}M  
    case VK_MENU: F5x*#/af  
     MaskBits|=ALTBIT; {u y^Bui}  
     break; Rf`_q7fm  
    case VK_CONTROL: 8=Oym~  
     MaskBits|=CTRLBIT; N}n3 +F  
     break; <\$"U5"`  
    case VK_SHIFT: $k&v juB.  
     MaskBits|=SHIFTBIT; <v -YMk@  
     break; 9VTAs:0D=  
    default: //judge the key and send message b3>zdS]Q  
     break; 9b=0 4aWHm  
   } l9|K,YVW  
   for(int index=0;index<MAX_KEY;index++){ @R`6j S_gK  
    if(hCallWnd[index]==NULL) FD E?O]^  
     continue; S{l)hwlE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5%9Uh'y#  
    { 1-^D2B[-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,_YI:xie|c  
     bProcessed=TRUE; S[$9_Jf  
    } !\{2s!l~  
   } .F@Lx45  
  } |(W wh$  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <?IDCOt ?  
   for(int index=0;index<MAX_KEY;index++){ m_Ed[h/I  
    if(hCallWnd[index]==NULL) {:"<E?+  
     continue; 55.2UN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .?3ro Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q['D?)sy  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?,riwDI 2  
   } tgCp2 `n  
  } jEQ_#KKYJ  
 } (Q||5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =/'>.p3/S  
} .?g=mh79(  
@BnK C&{  
  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: N e{=KdzT  
ec#`9w$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J&h59dm-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZhCz]z~tj6  
rU9")4sQ  
  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: $H3C/|  
N9d^;6;i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S6bYd`  
{ cu5}(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S"Vr+x?  
 {  Rh6CV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7^rT-f07  
  SaveBmp(); y=\&z&3$  
  return FALSE; 9.dZA9l@g  
 } yO8@.-jb  
 …… //其它处理及默认处理 \NDW@!X  
} :n~Mg{j3  
 K%%Ow  
>clVV6B  
  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。 xG edY*[`  
/J-.K*xKt  
  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。 <w~$S0_  
dMjQV&  
  二、编程步骤 0# 1~'e  
/-lW$.+{?  
  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"; 7mi=Xa:U  
@/As|)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; X0ugnQ6  
d/oD]aAEr  
  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; &~.|9P/45  
$ta"Ug.z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; {be|G^.c  
e]!`94f  
  5、 添加代码,编译运行程序。 ?en-_'}~a  
*R4=4e2#S  
三、程序代码 c3fi<?0&|  
!F6rcDKI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >W/mRv&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FR50y+h^$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ls|)SiXrY  
#if _MSC_VER > 1000 $i8oLSRV  
#pragma once vqUYr  
#endif // _MSC_VER > 1000 U[yA`7Zs}  
#ifndef __AFXWIN_H__ IwbV+mWQ  
#error include 'stdafx.h' before including this file for PCH Ygfy;G%  
#endif GmUm?A@B  
#include "resource.h" // main symbols 9XS>;<"2  
class CHookApp : public CWinApp H,/ =<Th;i  
{ J~ @W":v  
 public: fWg 3gRI  
  CHookApp(); Bq4@I_b  
  // Overrides ZZxt90YR'5  
  // ClassWizard generated virtual function overrides 4ee-tKH  
  //{{AFX_VIRTUAL(CHookApp) |l|$ Q;  
 public: ;L],i<F  
  virtual BOOL InitInstance(); n*AN/LBp  
  virtual int ExitInstance(); .ArOZ{lKD>  
  //}}AFX_VIRTUAL ] :](xW%  
  //{{AFX_MSG(CHookApp) ffOV7Dxy  
  // NOTE - the ClassWizard will add and remove member functions here. rP(;^8l"  
  // DO NOT EDIT what you see in these blocks of generated code ! X"f]  
  //}}AFX_MSG .)t*!$5=N  
  DECLARE_MESSAGE_MAP() ~-yq,x  
}; b9Eb"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _lH:%E*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6_w~#86=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^|h.B$_F,  
BOOL InitHotkey(); |hvclEu,  
BOOL UnInit(); -ebyW#  
#endif 77]Fp(uI  
[].euDrX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i|!R*"  
#include "stdafx.h" PMj!T \B|  
#include "hook.h" ,}^;q58  
#include <windowsx.h> [;C*9Nl  
#ifdef _DEBUG  </Dv?  
#define new DEBUG_NEW -OgC.6  
#undef THIS_FILE 6099w0fR`  
static char THIS_FILE[] = __FILE__; Wjd_|Kui  
#endif y&F&Z3t  
#define MAX_KEY 100 UQT=URS  
#define CTRLBIT 0x04 x)kp*^/  
#define ALTBIT 0x02 =#I/x=L:  
#define SHIFTBIT 0x01 z_$F)*PL  
#pragma data_seg("shareddata") ge&!GO  
HHOOK hHook =NULL; ~#rmw6y  
UINT nHookCount =0; ?j8_j  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey NrcxuItkYn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT :u?L y[x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9iK%@k  
static int KeyCount =0; |s !7U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift H|d"45J_  
#pragma data_seg() U ,\t2z  
HINSTANCE hins; 6l(HD([_p  
void VerifyWindow(); ~5~Cpu2v7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~Y7:08  
//{{AFX_MSG_MAP(CHookApp) S1*xM  
// NOTE - the ClassWizard will add and remove mapping macros here. jQ P2[\  
// DO NOT EDIT what you see in these blocks of generated code! c38ENf  
//}}AFX_MSG_MAP MB?762 Q  
END_MESSAGE_MAP() T5TA kEVl  
CDG,l7  
CHookApp::CHookApp() :T/I%|;f  
{ kfs[*ku  
 // TODO: add construction code here, P?`a{sl.  
 // Place all significant initialization in InitInstance U{&gV~  
} ?Lquf&`vP  
@VKN6yHH  
CHookApp theApp; k4~2hD<|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qL!pDZk  
{ +)e+$ l  
 BOOL bProcessed=FALSE; ~|8-Mo1ce  
 if(HC_ACTION==nCode) |Y;[)s =q  
 { &^K,"a{  
  if((lParam&0xc0000000)==0xc0000000){// Key up Au{J/G<W@  
   switch(wParam) IFW"S fdZk  
   { m}sh (W5\  
    case VK_MENU: 6fw2 ;$x"  
     MaskBits&=~ALTBIT; 8/ PS#dM\  
     break;  M_f.e!?  
    case VK_CONTROL: 63pd W/\j  
     MaskBits&=~CTRLBIT; \) g?mj^  
     break; y3@5~4+  
    case VK_SHIFT: rc7^~S]5  
     MaskBits&=~SHIFTBIT; uwWKsZ4:ij  
     break; 2X@"#wIg  
    default: //judge the key and send message ")eY{C  
     break; |aS272'  
   } *w23(f  
   for(int index=0;index<MAX_KEY;index++){ =]W[{@P  
    if(hCallWnd[index]==NULL) 9 kLA57  
     continue; yuq2)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fnJt8Y4  
    { &O^t]7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^_G@a,  
     bProcessed=TRUE; {Z^q?~zC[  
    } d2X?^  
   } V5bB$tL}3  
  } ~r?VXO p"  
  else if((lParam&0xc000ffff)==1){ //Key down o'|B|oZ  
   switch(wParam) IQQ QB  
   { sc$I,|d2  
    case VK_MENU: @5*$yi 'Cp  
     MaskBits|=ALTBIT; oR'u&\mB  
     break; Ex@o&j\93  
    case VK_CONTROL: t-)d*|2n}o  
     MaskBits|=CTRLBIT; M^jEp  
     break; Y@2yV(m)o  
    case VK_SHIFT: 2[g kDZ  
     MaskBits|=SHIFTBIT; r&Qq,koE  
     break; 5 N:IH@  
    default: //judge the key and send message w7b\?]}@  
     break; Z^_gS&nDa~  
   } (W+aeB0  
   for(int index=0;index<MAX_KEY;index++) W7"UhM  
   {  N}KL'  
    if(hCallWnd[index]==NULL) lwm 9gka  
     continue; 2$FH+wuW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DIx.a^LR  
    { v:]z-zU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s%^@@Dk  
     bProcessed=TRUE; 3a}53? $  
    } L"}tJM.d  
   } QAX3*%h  
  } i7%`}t  
  if(!bProcessed){ 1h?QEZ,6a  
   for(int index=0;index<MAX_KEY;index++){ z[' 2  
    if(hCallWnd[index]==NULL) in`|.#  
     continue; ;2[),k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >35W{ d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <."KejXg-  
   } U< <XeSp  
  } _fS4a134R  
 } $N\k*=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "v/Yw'! )  
} 1@n'6!]6O  
&cwN&XBY  
BOOL InitHotkey() -^q;e]+J  
{ p4D.nB8  
 if(hHook!=NULL){ iw%" "q(`  
  nHookCount++; DMlr%)@ {  
  return TRUE; R]3j6\  
 } |G_,1$  
 else *P8CzF^>\&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); VxtX%McK  
  if(hHook!=NULL) X.ecA`0  
   nHookCount++; #n]K$k>  
  return (hHook!=NULL); N5zx#g  
} c#TV2@   
BOOL UnInit() 5= T$h;O  
{ w|abaMam  
 if(nHookCount>1){ g'cVsO)S  
  nHookCount--; KW$.Yy  
  return TRUE; 0#4A0[vV  
 } #x`K4f)  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kU,g=+ 2J  
 if(unhooked==TRUE){ uU%Z%O  
  nHookCount=0; n|Ts:>`V  
  hHook=NULL; H4W!Md  
 } bo1J'pU  
 return unhooked; ,&y_^-|d  
} d"L(eI}G  
Rh#`AM`)j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e+)y6Q=  
{ 0!oqP1  
 BOOL bAdded=FALSE; K+"3He  
 for(int index=0;index<MAX_KEY;index++){ X}Om)WCr  
  if(hCallWnd[index]==0){ 5h|aX  
   hCallWnd[index]=hWnd; Kwi+}B!  
   HotKey[index]=cKey; RA?_j$  
   HotKeyMask[index]=cMask; |?nYs>K  
   bAdded=TRUE; ug.|ag'R  
   KeyCount++; "?<(-,T  
   break; MV2$0  
  } %a|Qw(4\  
 } !&:Cp_  
 return bAdded; "a9j2+9  
} H4sW%nZ0  
fDqDU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v(GnG  
{ dm]g:KWg  
 BOOL bRemoved=FALSE; Hpa6; eT  
 for(int index=0;index<MAX_KEY;index++){ ycSGv4 )  
  if(hCallWnd[index]==hWnd){ TspX7<6r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k`&FyN^)  
    hCallWnd[index]=NULL; 'J3yJ{  
    HotKey[index]=0; j Neb*dPoK  
    HotKeyMask[index]=0; 1zCu1'Wv  
    bRemoved=TRUE; ." gq[0_YS  
    KeyCount--; ]uF7HX7F  
    break; SP/b 4  
   } ITg:OOQ  
  } mj'N)6ga  
 } x;`G n_  
 return bRemoved; ij#v_~g3  
} q'a]DJ`  
rk4KAX_[  
void VerifyWindow() w\ 0vP  
{ UJQTArf  
 for(int i=0;i<MAX_KEY;i++){ (n8?+GCa  
  if(hCallWnd!=NULL){ bCr W'}:de  
   if(!IsWindow(hCallWnd)){ M$Ui=GGq  
    hCallWnd=NULL; \!30t1EZ  
    HotKey=0; -s!J3DB  
    HotKeyMask=0; 'jMs&  
    KeyCount--; _>]/.w2=  
   } H\n6t-l  
  } ;?@Rq"*  
 } _ Pzgn@D  
} qoH:_o8ClO  
7O k-T10  
BOOL CHookApp::InitInstance() `GBJa k  
{ 5+!yXkE^e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); m1j Eky(  
 hins=AfxGetInstanceHandle(); N\&VJc  
 InitHotkey(); d*e8P ep  
 return CWinApp::InitInstance(); llR5qq=t  
} @BjB Mi,  
H.]V-|U  
int CHookApp::ExitInstance() ,r~^<m  
{ $*$4DG1gaR  
 VerifyWindow(); a@&qdp  
 UnInit(); &&52ji<3  
 return CWinApp::ExitInstance(); Sin)]zG~0  
} S LeA,T  
T+~&jC:{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c(vi,U-hC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [tSv{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B8T5?bl  
#if _MSC_VER > 1000 bv(+$YR  
#pragma once @ N'P?i  
#endif // _MSC_VER > 1000 EZ/_uj2&SN  
v(JjvN21  
class CCaptureDlg : public CDialog +h/OQ]`/m  
{ 3hBYx@jTO  
 // Construction 2B6u) 95  
 public: |x1Ttr,  
  BOOL bTray; 35AH|U7b  
  BOOL bRegistered; }j1;0kb?  
  BOOL RegisterHotkey(); @XL49D12c  
  UCHAR cKey; :jkPV%!~  
  UCHAR cMask; }*%=C!m4R!  
  void DeleteIcon(); ^/Yk*Ny  
  void AddIcon(); q[vO mes  
  UINT nCount; 5N6R%2,A  
  void SaveBmp(); ]Hi1^Y<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &WAU[{4W  
  // Dialog Data ;sf'"UnL  
  //{{AFX_DATA(CCaptureDlg) ? N]bFW"t|  
  enum { IDD = IDD_CAPTURE_DIALOG }; o](ORS$~  
  CComboBox m_Key; s5{H15  
  BOOL m_bControl; veh=^K%G |  
  BOOL m_bAlt; Bs`='w%7  
  BOOL m_bShift; ,g?M[(wtc  
  CString m_Path; Gv8Z  
  CString m_Number; j+/EG^*/  
  //}}AFX_DATA gGA5xkA  
  // ClassWizard generated virtual function overrides h<?I?ZR0$  
  //{{AFX_VIRTUAL(CCaptureDlg) X%iqve"{nB  
 public: hhylsm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2y8FP#  
 protected:  }l]r-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JPT&!%~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yfFe%8w_vw  
  //}}AFX_VIRTUAL Y%]g,mG  
  // Implementation e2;=OoBK  
 protected: p{r{}iYI  
  HICON m_hIcon; 98<^!mwF  
  // Generated message map functions B1i'Mzm-4  
  //{{AFX_MSG(CCaptureDlg) YWi Y[  
  virtual BOOL OnInitDialog(); r`u 9MJ*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )0;O<G] d  
  afx_msg void OnPaint(); Cd p_niF  
  afx_msg HCURSOR OnQueryDragIcon(); j}jU.\*v<  
  virtual void OnCancel(); l~kxK.Ru  
  afx_msg void OnAbout(); GBd mT-7  
  afx_msg void OnBrowse(); !a'{gw  
  afx_msg void OnChange(); <_bGV  
 //}}AFX_MSG T z+Y_  
 DECLARE_MESSAGE_MAP() RhjU^,%  
}; 4HXNu,T'  
#endif V+*1?5w  
a5@lWpQsV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W$" >\A0%  
#include "stdafx.h" L#IY6t  
#include "Capture.h" e=u}J%|  
#include "CaptureDlg.h" 1tpt433  
#include <windowsx.h> _&@cU<bdee  
#pragma comment(lib,"hook.lib") <("P5@cExU  
#ifdef _DEBUG +w@/$datI  
#define new DEBUG_NEW R ta_\Aj!  
#undef THIS_FILE (jE[W:  
static char THIS_FILE[] = __FILE__; KiNluGNt  
#endif h&{>4{  
#define IDM_SHELL WM_USER+1 .7#04_aP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,76nDXy`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 90$`AMR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MP8s}  
class CAboutDlg : public CDialog {y:+rh&  
{ A)^A2xZQ  
 public: f6HDfJmE  
  CAboutDlg(); gi\UNT9x  
  // Dialog Data QV%eTA  
  //{{AFX_DATA(CAboutDlg) UDa\*  
  enum { IDD = IDD_ABOUTBOX }; f^XfIH_#  
  //}}AFX_DATA &4L+[M{J@4  
  // ClassWizard generated virtual function overrides K~z9b4a>  
  //{{AFX_VIRTUAL(CAboutDlg) =G<S!qW  
 protected: :w c.V  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \3z^/F~  
  //}}AFX_VIRTUAL \RTXfe-`  
  // Implementation AyZBH &}RZ  
 protected: 7R om#Kl:  
  //{{AFX_MSG(CAboutDlg) (KG>lTdN  
  //}}AFX_MSG *W<g%j-a  
  DECLARE_MESSAGE_MAP() 3gmu-t v  
}; o"A%dC_  
V|dKKb[Lve  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KY;E.D`  
{ [k6 5i  
 //{{AFX_DATA_INIT(CAboutDlg) t) ~v5vr  
 //}}AFX_DATA_INIT !7[Rhk7bW  
} [5kaF"  
 0bk094  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .:s**UiDR  
{ >@d=\Kyu  
 CDialog::DoDataExchange(pDX); /!0{9F<  
 //{{AFX_DATA_MAP(CAboutDlg) !~k-S exh  
 //}}AFX_DATA_MAP ;zvg]  %  
} +Gvf5+ 5VR  
Z$5@r2d)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <)(STo  
 //{{AFX_MSG_MAP(CAboutDlg) /ZKO\q  
 // No message handlers tpi63<N  
 //}}AFX_MSG_MAP j^Z3  
END_MESSAGE_MAP() 6*2z^P9FRj  
.Su9fj y%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v ~%6!Tr  
: CDialog(CCaptureDlg::IDD, pParent) C '}8  
{ /z+}xRS  
 //{{AFX_DATA_INIT(CCaptureDlg) TNV#   
  m_bControl = FALSE; -3c?Yaf"  
  m_bAlt = FALSE; S\jN:o#b  
  m_bShift = FALSE; ? <slB>8  
  m_Path = _T("c:\\"); wLC|mByq  
  m_Number = _T("0 picture captured."); 0Q5ua `U  
  nCount=0; !g~xn2m$R  
  bRegistered=FALSE;  B9^@]  
  bTray=FALSE; Piz/vH6M}  
 //}}AFX_DATA_INIT Aj4i}pT  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Os1(28rl  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LE!3'^Zq  
} NPEs0|  
-U=bC   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |S:St HZm  
{ YXa^jFp  
 CDialog::DoDataExchange(pDX); u<\/T&S  
 //{{AFX_DATA_MAP(CCaptureDlg) 8\t~ *@"  
  DDX_Control(pDX, IDC_KEY, m_Key); |k> _ jO  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yHhBUpIo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); hun/H4f|  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -q\1Tlc]3  
  DDX_Text(pDX, IDC_PATH, m_Path); Zcv1%hI  
  DDX_Text(pDX, IDC_NUMBER, m_Number); c0jC84*v  
 //}}AFX_DATA_MAP (Y!@,rKd   
} \ey3i((L  
:NO'[iE  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T.aY {Y  
//{{AFX_MSG_MAP(CCaptureDlg) ? S>"yAoe  
 ON_WM_SYSCOMMAND() 7WW@%4(  
 ON_WM_PAINT() !B(6  
 ON_WM_QUERYDRAGICON() SUfl`\O  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HkEfBQmh  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hn-9l1~!h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C jsy1gA  
//}}AFX_MSG_MAP +=^10D  
END_MESSAGE_MAP() RpR;1ktF>  
izow=}  
BOOL CCaptureDlg::OnInitDialog() hO@'WoniW  
{ NS;,(v{*N  
 CDialog::OnInitDialog(); \:\rkc9LI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); y}5H<ZcXA  
 ASSERT(IDM_ABOUTBOX < 0xF000); q3e %L  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;2-,Xzz8  
 if (pSysMenu != NULL) f 6Bx>lh  
 { ?x"<0k1g  
  CString strAboutMenu; tD.md _E  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ! iA0u  
  if (!strAboutMenu.IsEmpty()) iXMs*G cK  
  { 4WZ:zr N  
   pSysMenu->AppendMenu(MF_SEPARATOR); B3]q*ERAo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \SS1-UbL  
  } Y'`w.+9  
 } nWfOiw-t  
 SetIcon(m_hIcon, TRUE); // Set big icon $uF} GP_)  
 SetIcon(m_hIcon, FALSE); // Set small icon NSUw7hnWvz  
 m_Key.SetCurSel(0); ^i2W=A'P  
 RegisterHotkey(); r:2G11[  
 CMenu* pMenu=GetSystemMenu(FALSE); /Zap'S/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); n:,At] ky  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _<|NVweFS  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +;tXk  
 return TRUE; // return TRUE unless you set the focus to a control 61HU_!A8S  
} YN#i^(  
oQ1>*[e<u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;tP-#Xf  
{ Fx*iAH\e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6LrG+p`  
 { 9^,MC&eb  
  CAboutDlg dlgAbout; BMkN68q  
  dlgAbout.DoModal(); <spVUp  
 } N?TXPY  
 else \3LP@;Phn  
 { *JDQaWzBd  
  CDialog::OnSysCommand(nID, lParam); )HQ':ZE$  
 } ABw:SQ6=Q  
} 8i/5L=a"`  
Gjf b<  
void CCaptureDlg::OnPaint() a,i k=g  
{ w{l}(:xPp  
 if (IsIconic()) awkPFA*c'  
 { @&#k['c  
  CPaintDC dc(this); // device context for painting e` 9d&"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \ :To\6\Ri  
  // Center icon in client rectangle oJb${k<3  
  int cxIcon = GetSystemMetrics(SM_CXICON); Yl4XgjG  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9+H C!Uot  
  CRect rect; 'c7C*6;a  
  GetClientRect(&rect); !Hq$7j_  
  int x = (rect.Width() - cxIcon + 1) / 2; q{T [|(!  
  int y = (rect.Height() - cyIcon + 1) / 2; vy&'A$ H  
  // Draw the icon wV8_O)[  
  dc.DrawIcon(x, y, m_hIcon); 0M=A,`qk  
 } (7Su{tq  
 else )#S;H$@$  
 { g>` k9`  
  CDialog::OnPaint(); 3-x ;_  
 } czNi)4x  
} gQ90>P:  
O|%03q(  
HCURSOR CCaptureDlg::OnQueryDragIcon() <O:}dXqZ  
{ _y:-_q  
 return (HCURSOR) m_hIcon; y7pwYRY  
} t5O '7x  
8Of.n7{  
void CCaptureDlg::OnCancel() \Lu aI  
{ jW]Q-  
 if(bTray) >b\{y}[  
  DeleteIcon(); [B~*88T  
  CDialog::OnCancel(); EzII!0 F  
} "&Q sv-9t  
Me;XG?`  
void CCaptureDlg::OnAbout() 3CL1Z\8To  
{ p^.qwP\P  
 CAboutDlg dlg; +O$`8a)m  
 dlg.DoModal(); v']Tusmg  
} y{>T['"@  
,GeW_!Q[  
void CCaptureDlg::OnBrowse() 8'WoG]E_  
{ '=AqC,\#  
 CString str; 79&=MTM  
 BROWSEINFO bi; wjtFZGx&  
 char name[MAX_PATH]; F\u]X  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u@]rR&h`  
 bi.hwndOwner=GetSafeHwnd(); ZR]p7{8B  
 bi.pszDisplayName=name; SI`ems{1>c  
 bi.lpszTitle="Select folder"; /,d]`N!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C6"{-{H  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 953GmNZ7  
 if(idl==NULL) Ly46S  
  return; dzk1!yy  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .R^R32ln  
 str.ReleaseBuffer(); sA~Ijg"6  
 m_Path=str; <) cJz  
 if(str.GetAt(str.GetLength()-1)!='\\') :(Ak:  
  m_Path+="\\"; /9b+I/xY"  
 UpdateData(FALSE); Sq ]VtQ(  
} Z-j?N{3&  
F4NM q&_  
void CCaptureDlg::SaveBmp()  o,rK8x  
{ y_``-F&Z  
 CDC dc; V= g u'~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); G#L6;  
 CBitmap bm; L,yq'>*5s  
 int Width=GetSystemMetrics(SM_CXSCREEN); QsX`IYk  
 int Height=GetSystemMetrics(SM_CYSCREEN); Xv+!) j<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); wZ5k|5KtW  
 CDC tdc; qXprD.; }  
 tdc.CreateCompatibleDC(&dc); Py`7)S  
 CBitmap*pOld=tdc.SelectObject(&bm); ,\ -4X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #/"Tb ^c9  
 tdc.SelectObject(pOld); L)i6UAo  
 BITMAP btm; Z*R~dHr   
 bm.GetBitmap(&btm); }ssP%c]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]`q]\EH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1! j^  
 BITMAPINFOHEADER bih; :IO"' b  
 bih.biBitCount=btm.bmBitsPixel; _Tf %<E  
 bih.biClrImportant=0; B?db`/G9  
 bih.biClrUsed=0; 5g`J}@"k  
 bih.biCompression=0; ,V9 r2QY  
 bih.biHeight=btm.bmHeight; d(j g "@  
 bih.biPlanes=1; Jt:)(&-t   
 bih.biSize=sizeof(BITMAPINFOHEADER); G?^w <  
 bih.biSizeImage=size;  Spw^h=o  
 bih.biWidth=btm.bmWidth; KBoW(OP4'  
 bih.biXPelsPerMeter=0; \=[38?QOY  
 bih.biYPelsPerMeter=0; e#vGrLs.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dUBf.2 ry  
 static int filecount=0; IrIW>r} -  
 CString name; "!Nu A  
 name.Format("pict%04d.bmp",filecount++); FzOlM-)m   
 name=m_Path+name; .] 0:`Y,;  
 BITMAPFILEHEADER bfh; >[N6_*K]  
 bfh.bfReserved1=bfh.bfReserved2=0; &p+2Vz{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &k`/jl;u  
 bfh.bfSize=54+size; ~<}?pDA}~  
 bfh.bfOffBits=54; Ld'3uM/  
 CFile bf; ;Za^).=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ UhXVeGO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NA YwuE-`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1wE`kbC<  
  bf.WriteHuge(lpData,size);  wH\ K'/  
  bf.Close(); S^N{=*  
  nCount++; |}: D_TX  
 } ZftucD|ZY/  
 GlobalFreePtr(lpData); x&N@R?AG1  
 if(nCount==1) Va4AE)[/*  
  m_Number.Format("%d picture captured.",nCount); ?'>[n m  
 else PWV+ M@  
  m_Number.Format("%d pictures captured.",nCount); ;[7#h8  
  UpdateData(FALSE); rW)}$|-Z  
} BA9;=orx  
H:t2;Z'  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "Z"`X3,-z  
{ ()fYhk|W  
 if(pMsg -> message == WM_KEYDOWN) >`n)-8  
 { Va/}|& 9  
  if(pMsg -> wParam == VK_ESCAPE) orEb+  
   return TRUE; G&yF9s)Lvs  
  if(pMsg -> wParam == VK_RETURN) BO 3z$c1yU  
   return TRUE; aSeh?2n8  
 } km}E&ao  
 return CDialog::PreTranslateMessage(pMsg); b:&= W>r  
} ?aZ\D g{  
R;w1& Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^izf&W.j!  
{ ^56#{~%^?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Tt{ft?H71  
  SaveBmp(); =/N0^  
  return FALSE; v8THJf  
} } d7o-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "; ?^gA  
 CMenu pop; PR>%@-Vgj  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #~6X9,x=  
 CMenu*pMenu=pop.GetSubMenu(0); cV* 0+5  
 pMenu->SetDefaultItem(ID_EXITICON); ZQ~EaI9R  
 CPoint pt; -<5H8P-  
 GetCursorPos(&pt); B 3eNvUFZg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P' k`H  
 if(id==ID_EXITICON) (<yQA. M  
  DeleteIcon(); 3 J\&t4q  
 else if(id==ID_EXIT) M5B?`mTl  
  OnCancel(); =!2(7Nr  
 return FALSE; `"|u NVn  
} cs)z!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jhE3@c@pT  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 1L.yh U\  
 AddIcon(); gd;e-.  
 return res; YwF\  
} K/LoHWy+n*  
OSCeTkR  
void CCaptureDlg::AddIcon() G6j9,#2@  
{ Y.8mgy>   
 NOTIFYICONDATA data; 9,Ug  
 data.cbSize=sizeof(NOTIFYICONDATA); QLyBP!X-  
 CString tip; Ks^EGy+O:-  
 tip.LoadString(IDS_ICONTIP); 4";[Xr{pW  
 data.hIcon=GetIcon(0); _6'HBE  
 data.hWnd=GetSafeHwnd(); }MV=t7x9+  
 strcpy(data.szTip,tip); .Ue1}'v*,  
 data.uCallbackMessage=IDM_SHELL; MXuiQ;./  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n&}ILLc  
 data.uID=98; X6: c-  
 Shell_NotifyIcon(NIM_ADD,&data); .cm$*>LW:x  
 ShowWindow(SW_HIDE); <o\I C?A  
 bTray=TRUE; v"smmQZik  
} NpYzN|W:  
$F86Dwd  
void CCaptureDlg::DeleteIcon() JIU=^6^2'  
{ EXYr_$gRs  
 NOTIFYICONDATA data; }KwL_\>&f  
 data.cbSize=sizeof(NOTIFYICONDATA); SiQszV.&  
 data.hWnd=GetSafeHwnd(); E:ocx2dp  
 data.uID=98; V$fvf#T  
 Shell_NotifyIcon(NIM_DELETE,&data); WT>2eMK[  
 ShowWindow(SW_SHOW); #Y9~ Xp^.  
 SetForegroundWindow(); {QTnVS't 0  
 ShowWindow(SW_SHOWNORMAL); V3$Yr"rZ;  
 bTray=FALSE; `>cBR,)r  
} Ox1#}7`0>  
JA~v:ec  
void CCaptureDlg::OnChange() pe$l'ur  
{ =%V(n{7=  
 RegisterHotkey(); vmZyvJSE  
} y6nPs6kR  
[<M~6]  
BOOL CCaptureDlg::RegisterHotkey() ^5 sO;vf  
{ 3R sbi  
 UpdateData(); 7U\GX  
 UCHAR mask=0; 9vZD?6D,n  
 UCHAR key=0; zn'F9rWx>  
 if(m_bControl) |B;tv#mKD  
  mask|=4; t\$P*_  
 if(m_bAlt) i#Y[I"'  
  mask|=2; u 6(O;  
 if(m_bShift) a.yCd/  
  mask|=1; sox0:9Oqnf  
  key=Key_Table[m_Key.GetCurSel()]; s8/y|HN^  
 if(bRegistered){ 0qj:v"~Q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  ]%L?b-e  
  bRegistered=FALSE; Nf<mgOAT1  
 } Io81zA  
 cMask=mask; eJ JD'Z  
 cKey=key; w+NdEE4H9z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ROyG+dUy  
 return bRegistered; =-e` OHA  
} ^"e|)4_5\  
5HZt5="+  
  四、小结 #ONad0T;  
\Y0o~JD  
  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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