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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: PK@hf[YHe  
  FV>LD% uu  
  一、实现方法 hmv"|1Sa!~  
5 iUT#  
  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: 00 Qn1  
=#||&1U$  
#pragma data_seg("shareddata") ,lLkAd?q  
HHOOK hHook =NULL; //钩子句柄 6C>"H  
UINT nHookCount =0; //挂接的程序数目 h[M~cZ{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L$^ya%2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^T83E}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >L F y:a  
static int KeyCount =0; 3>Ts7 wM  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 dHV3d'.P  
#pragma data_seg() \*Ro a&<!  
A` x_M!m  
  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。 *6 oQW  
u6{= Z:  
  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: c`94a SnV  
bLyU;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $gU6=vN1#  
cKey,UCHAR cMask) &L[7jA'[J  
{ @Omgk=6  
 BOOL bAdded=FALSE; / E~)xgPM<  
 for(int index=0;index<MAX_KEY;index++){ ;Ll/rJ:*  
  if(hCallWnd[index]==0){ ]RgLTqv4x  
   hCallWnd[index]=hWnd; D7.|UG?G  
   HotKey[index]=cKey; Y;ytm #=  
   HotKeyMask[index]=cMask; spIkXEK  
   bAdded=TRUE; V3 j1M?>  
   KeyCount++; C'mYR3?m;  
   break; eYd6~T[9  
  } R0dIxG%  
 } |F _ Z  
 return bAdded; W<<{}'Db/#  
} /XtpGk_1)  
//删除热键 'r;C( Gh6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g.![>?2$8  
{ 0?hJ!IT;q7  
 BOOL bRemoved=FALSE; >*#clf;@p  
 for(int index=0;index<MAX_KEY;index++){ $^|I?5xD  
  if(hCallWnd[index]==hWnd){ DA'A-C2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F/c7^  
    hCallWnd[index]=NULL; KUs\7Sb  
    HotKey[index]=0;  wfr+-  
    HotKeyMask[index]=0; kkfwICBI  
    bRemoved=TRUE; Q"UWh~  
    KeyCount--; 6")co9  
    break; '\yp}r'u  
   } oNV5su  
  } Z]-C,8MM  
 } hZ_0lX}  
 return bRemoved; iwb]mJUA  
} 5r1{l%?  
*Jd,8B/hC  
1 o5DQ'~n  
  DLL中的钩子函数如下: @R+bR<}]  
pyPS5vWG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ofe SGx  
{ XI6LPA0%  
 BOOL bProcessed=FALSE; e jY|o Bj  
 if(HC_ACTION==nCode) slSQ\;CDA  
 { Op] L#<&T  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C4V#qhj  
   switch(wParam) ^fj):n5/  
   {  ,/ V'(\>  
    case VK_MENU: /rRQ*m_  
     MaskBits&=~ALTBIT; Wj N0KA  
     break; *ml&}9  
    case VK_CONTROL: p)M\q fZ  
     MaskBits&=~CTRLBIT; F_Q,j]0  
     break; Z  Mp  
    case VK_SHIFT: >pa tv  
     MaskBits&=~SHIFTBIT; # L\t)W  
     break; 0(9]m)e  
    default: //judge the key and send message IbRy~  
     break; W!a~ #R/r-  
   } s }P-4Sg  
   for(int index=0;index<MAX_KEY;index++){ o!Vs{RRu}  
    if(hCallWnd[index]==NULL) xJ"CAg|B  
     continue; 2i);2>HLG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ck,.4@\tK  
    { R#Z1+&='  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  )]2yTG[  
     bProcessed=TRUE; 51oZ w%os=  
    } nU"V@_?\  
   } }K=T B}yY  
  } 1XZ|}Xz  
  else if((lParam&0xc000ffff)==1){ //有键按下 bTzVmqGY  
   switch(wParam) /*GRE#7S  
   { <DS+"#  
    case VK_MENU: &k3'UN!&Ix  
     MaskBits|=ALTBIT; PGKXzp'  
     break; GVM#Xl}w9  
    case VK_CONTROL: II8nz[s  
     MaskBits|=CTRLBIT; +o3g]0  
     break; !LJ.L?9qw  
    case VK_SHIFT: N93E;B  
     MaskBits|=SHIFTBIT; ^%d{i'9?  
     break; @ 7?_Yw  
    default: //judge the key and send message k:TfE6JZ  
     break; 'O`3FI  
   } )|{{}w~`  
   for(int index=0;index<MAX_KEY;index++){ @5y(>>C}8%  
    if(hCallWnd[index]==NULL) &~%@QC/  
     continue; e%U*~{m+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ' XF`&3 i  
    { 6.|~~/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ay_D.gxz  
     bProcessed=TRUE; lnDDFsA  
    } kpH;D=;  
   } $dP)8_Z2  
  } pPZ/O 6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $3TTHS o  
   for(int index=0;index<MAX_KEY;index++){ NXBOo  
    if(hCallWnd[index]==NULL) )DmiN^:  
     continue; AD\<}/3U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q:gn>/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hU 7fZl%yl  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mx9/K+:  
   }  nvPE N  
  } f~FehN7  
 } /6?plt&CA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 'pY;]^M  
} LJwMM  
2&0<$>  
  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: :BX{ *P  
n^\;*1%$c@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pRvs;klf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  |{)xC=  
EQ7n'Wqq  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: DME?kh>7  
C 94@YWs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8-a6Q|   
{ Qe$>Jv5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) n[Iu!v\/*  
 { yim$y, =d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7f%Qc %B  
  SaveBmp(); RQCQGa^cP  
  return FALSE; 5 ek %d  
 } J md ?  
 …… //其它处理及默认处理 G}#/`]o!K  
} : W^\ mH  
&}0wzcMg  
fq'Xy9L  
  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。 g]<Z]R`  
_S2^;n?  
  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。 (kQ.tsl  
OawrS{  
  二、编程步骤 $xtE+EV.p  
mBZ Dl4 '  
  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"; k!/ _/^{  
p/1}>F|i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Zng` oFD  
C^ " Hj  
  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; G 0QXf  
< mK  
  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; '}+X,Usm  
^T&u!{82j  
  5、 添加代码,编译运行程序。 c =N]! ,MO  
X;6r $   
三、程序代码 V2s}<uG  
W B*`zCM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL PyT}}UKj:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) kE_@5t7O{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g<iwxF  
#if _MSC_VER > 1000 12d}#G<q-  
#pragma once cCh5Jl@Z  
#endif // _MSC_VER > 1000 ah/6;,T  
#ifndef __AFXWIN_H__ nG ^M 2)(8  
#error include 'stdafx.h' before including this file for PCH d0A\#H_&  
#endif ]v@tZ}  
#include "resource.h" // main symbols H@2v<e@  
class CHookApp : public CWinApp ]PzTl {]  
{ o;VkoYV  
 public: 8q~FUJhU  
  CHookApp(); Vr-3M+l=O  
  // Overrides bmO__1  
  // ClassWizard generated virtual function overrides `F2*o47|t  
  //{{AFX_VIRTUAL(CHookApp) A:.IBctsd  
 public: g;-+7ViIr  
  virtual BOOL InitInstance(); lNaez3  
  virtual int ExitInstance(); qsft*&  
  //}}AFX_VIRTUAL CFBUQMl >  
  //{{AFX_MSG(CHookApp)  bL'#  
  // NOTE - the ClassWizard will add and remove member functions here. {wp Mg  
  // DO NOT EDIT what you see in these blocks of generated code ! #U$YZ#B  
  //}}AFX_MSG 5"}y\  
  DECLARE_MESSAGE_MAP() Pv7f _hw  
};  ?+ -/';  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); {V%%^Zhwy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8tV=fSHd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t*Vao  
BOOL InitHotkey(); #0?"J)  
BOOL UnInit(); 1=/doo{^  
#endif wsf Hd<Z_  
(RDa,&  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -t%{"y  
#include "stdafx.h" k+WO &g*|  
#include "hook.h" &h7smZO5j  
#include <windowsx.h> Ok}{jwJ%W;  
#ifdef _DEBUG v7o?GQ75  
#define new DEBUG_NEW ;z.6'EYMG  
#undef THIS_FILE -YzQ2#K  
static char THIS_FILE[] = __FILE__; B?$01?9V  
#endif d`?U!?Si  
#define MAX_KEY 100 VQy 9Y  
#define CTRLBIT 0x04 o%V @D'w  
#define ALTBIT 0x02 ldAov\X  
#define SHIFTBIT 0x01 ch0oFc$  
#pragma data_seg("shareddata") MtpU~c  
HHOOK hHook =NULL; }t@f |TX  
UINT nHookCount =0; i"%JFj_G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t4f (Y,v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT KjFZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey f$1Gu  
static int KeyCount =0; C<[d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift t(J![wB}  
#pragma data_seg() DO7- =74=  
HINSTANCE hins; XGE 2J  
void VerifyWindow(); :`+|'*b(A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6Gs{nFw  
//{{AFX_MSG_MAP(CHookApp) t{/:(Nu  
// NOTE - the ClassWizard will add and remove mapping macros here. V*6l6-y~Ih  
// DO NOT EDIT what you see in these blocks of generated code! M|/oFV  
//}}AFX_MSG_MAP " Sc5qG  
END_MESSAGE_MAP() t[]['Iosd  
c@RT$Q9j  
CHookApp::CHookApp() e1^fUOS  
{ 5~@?>)TBv  
 // TODO: add construction code here, \@Ee9C 13  
 // Place all significant initialization in InitInstance 4=u+ozCG  
} B3y?.  
69t7=r  
CHookApp theApp; u|(Ux~O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) KKLR'w,A>  
{ kcLj Kp  
 BOOL bProcessed=FALSE; Ap11b|v  
 if(HC_ACTION==nCode) Qo'yS"g<9)  
 { Of-C  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~c9>Nr9|`  
   switch(wParam) 5JS ZLC  
   { 4cott^K.  
    case VK_MENU: rei 8LW  
     MaskBits&=~ALTBIT; MQwIPjk8  
     break; i~9?:plS  
    case VK_CONTROL: tS?a){^:c  
     MaskBits&=~CTRLBIT; *R5`.j =  
     break; {bT9VZ>  
    case VK_SHIFT: &svx@wW  
     MaskBits&=~SHIFTBIT; i][f#e4  
     break; *3;UAfHv  
    default: //judge the key and send message EbCIIMbe"  
     break; ]53O}sH>  
   } z(+&wa  
   for(int index=0;index<MAX_KEY;index++){ },rav]  
    if(hCallWnd[index]==NULL) 5gSylts8  
     continue; #S%4?   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o*X]b]  
    { doBNghS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /dLA`=rZx  
     bProcessed=TRUE; L~IE,4  
    } q%>7L<r  
   } u+m4!`  
  } eI^gV'UK  
  else if((lParam&0xc000ffff)==1){ //Key down ~F;CE"3A  
   switch(wParam) 3 -tO;GKb  
   { D z@1rc<B  
    case VK_MENU: f e|g3>/|  
     MaskBits|=ALTBIT; ^00{Hd6  
     break; (%bE~Q2P*<  
    case VK_CONTROL: s _~IZ%+<.  
     MaskBits|=CTRLBIT; JT04vm4  
     break; H8&p<=  
    case VK_SHIFT: 5X0QxnnV  
     MaskBits|=SHIFTBIT; .$Y? W<  
     break; X]!D;7^  
    default: //judge the key and send message ><=rIhG%H@  
     break; l xe`u}[  
   } 09d9S`cS\  
   for(int index=0;index<MAX_KEY;index++) ox[ .)v  
   { Umz05*  
    if(hCallWnd[index]==NULL) $e BQH  
     continue; V.8%|-d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xIL#h@dz  
    { qBYg[K>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |c0,  
     bProcessed=TRUE; zJY']8ah  
    } =WK04\H  
   } /;l[I=VI  
  }  q>-R3HB  
  if(!bProcessed){ & fu z2xv  
   for(int index=0;index<MAX_KEY;index++){ >F[GVmC  
    if(hCallWnd[index]==NULL) =u=Kw R  
     continue; O9^T3~x[V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zsVcXBz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5/?P|T   
   } T@P!L  
  } rslvsS:  
 } SE)nD@:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;iU%Kt  
} <6jFKA<  
s8vKKvs`9  
BOOL InitHotkey() G;s"h%Xw98  
{ {x {H$f  
 if(hHook!=NULL){ aGK@)&h$  
  nHookCount++; Fp%Ln(/m  
  return TRUE; I]R9HGJNlJ  
 } ?pG/m%[  
 else 9I .^LZ"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,lm=M 5b  
  if(hHook!=NULL) $UvPo0{  
   nHookCount++; c}-(.eu  
  return (hHook!=NULL); g_aCHEFBv  
} ? ?[g}>  
BOOL UnInit() 8lP6-VA  
{ ~3CVxbB^<  
 if(nHookCount>1){ opp!0:jS*  
  nHookCount--; ashar&'  
  return TRUE; @i LIU}+  
 } % frfSGf.#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |PP.<ce\-  
 if(unhooked==TRUE){ vzXag*0  
  nHookCount=0; 5 1dSFr<#  
  hHook=NULL; 6 BAW  
 } 4W;S=#1  
 return unhooked; ~OypE4./1  
} obo&1Uv,/  
RMP9y$~3pU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2SG$LIV 9Y  
{ 42+#<U7T  
 BOOL bAdded=FALSE; )Gk`[*q ;  
 for(int index=0;index<MAX_KEY;index++){ $yu?.b 9H#  
  if(hCallWnd[index]==0){ %J~WC$=Qv  
   hCallWnd[index]=hWnd; ,6,]#R :J  
   HotKey[index]=cKey; nxo+?:**  
   HotKeyMask[index]=cMask; )L5i&UK.  
   bAdded=TRUE; {whvTN1#dh  
   KeyCount++; ~*.-  
   break; :iUF7P1I  
  } #hw>tA6  
 } V diJ>d[  
 return bAdded; szmmu*F,U:  
} ](jFwxU  
_$s> c!t,#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iG<Som  
{ ,"2TArC'z  
 BOOL bRemoved=FALSE; p $`92Be/  
 for(int index=0;index<MAX_KEY;index++){ ]$b2a&r9  
  if(hCallWnd[index]==hWnd){ wvby?MhPY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZH 6\><My  
    hCallWnd[index]=NULL; +-$Ko fnM  
    HotKey[index]=0; ~AB*]Us  
    HotKeyMask[index]=0; :iF%cy.  
    bRemoved=TRUE; s1j{x&OSq  
    KeyCount--; cr;`Tl~}s  
    break; CH#k(sy  
   } Ond'R'3\E  
  } s Be7"^  
 } OF U/gaO~  
 return bRemoved; EHf\L  
} fS&6  
"sUyHt-&  
void VerifyWindow() *m+BuGt|  
{ Wr?'$:  
 for(int i=0;i<MAX_KEY;i++){ `Ityi}  
  if(hCallWnd!=NULL){ 4Y\wnwI  
   if(!IsWindow(hCallWnd)){ \}0-^(9zd  
    hCallWnd=NULL; /8'S1!zc  
    HotKey=0; IH *s8tPc  
    HotKeyMask=0; ?Bi*1V<R  
    KeyCount--; :mcYZPX#  
   } f. }c7  
  } <If35Z)~  
 } i5}4(sV  
} w8Sv*K  
8hanzwoJ:  
BOOL CHookApp::InitInstance() f9$xk|2g  
{ b \7iY&.C|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yY).mxRN  
 hins=AfxGetInstanceHandle(); bC!`@/  
 InitHotkey(); KJn!Ap  
 return CWinApp::InitInstance(); s"KJiQKGM  
} gY-5_Ab  
rh*sbZ68>E  
int CHookApp::ExitInstance() DL^o_61  
{ }n:?7  
 VerifyWindow(); qy1F* kY  
 UnInit(); -_OS%ARa  
 return CWinApp::ExitInstance(); YIhm$A"z0"  
} jEdtJ EPa  
DE$q+j0P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CG\tQbum  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C BYX]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9LnN$e  
#if _MSC_VER > 1000 p/Sbt/R  
#pragma once VZka}7a  
#endif // _MSC_VER > 1000 URgk^nt2p  
IA zZ1#/3  
class CCaptureDlg : public CDialog h Ov={:  
{ N;oQ^B'  
 // Construction /&#XhrT  
 public: POI.]1i  
  BOOL bTray; e1myH6$W  
  BOOL bRegistered; h5_G4J{1  
  BOOL RegisterHotkey(); +yob)%  
  UCHAR cKey; f"u *D,/sS  
  UCHAR cMask; eK_*2=;XRW  
  void DeleteIcon(); [D "t~QMr  
  void AddIcon(); >Hb^P)3  
  UINT nCount; mMx ;yZ  
  void SaveBmp(); N]EcEM#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^efb 5  
  // Dialog Data vr^~yEr  
  //{{AFX_DATA(CCaptureDlg) -~[9U,  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5vAf7\*  
  CComboBox m_Key; AE`We$!  
  BOOL m_bControl; #o/ H~Iv  
  BOOL m_bAlt; lE8&..~l$+  
  BOOL m_bShift; N/$`:8"  
  CString m_Path; yH 9!GS#  
  CString m_Number; -4rDbDsr  
  //}}AFX_DATA 93qwH%  
  // ClassWizard generated virtual function overrides v0Dq@Q1  
  //{{AFX_VIRTUAL(CCaptureDlg) jCAC `  
 public: Qp"y?S  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n~V4nj&_T  
 protected: N..j{FE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )Au6Nf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); OdWou|Gz  
  //}}AFX_VIRTUAL _I`,Br:N  
  // Implementation q+ KzIde|%  
 protected: P&d"V<  
  HICON m_hIcon; +;g {$da5  
  // Generated message map functions CM)Q&:  
  //{{AFX_MSG(CCaptureDlg) bPD`+: A_  
  virtual BOOL OnInitDialog(); EV#MQM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); oRKEJ Nps  
  afx_msg void OnPaint(); pL1Q7&&c0  
  afx_msg HCURSOR OnQueryDragIcon(); 8zLY6@  
  virtual void OnCancel(); I1X /Lj=  
  afx_msg void OnAbout(); +')f6P;t>=  
  afx_msg void OnBrowse(); ~U(,TjJb  
  afx_msg void OnChange(); *#%9Rp2|  
 //}}AFX_MSG y-p70.'{U  
 DECLARE_MESSAGE_MAP() q#Zs\PD  
}; IM$2VlC  
#endif  rhpPCt  
PiV7*F4qI.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Ftw;Yz  
#include "stdafx.h" {7cX#1  
#include "Capture.h" Q'+MFld   
#include "CaptureDlg.h" -U<Upn)2  
#include <windowsx.h> 1:NrP'W^  
#pragma comment(lib,"hook.lib") [s9O0i" Y  
#ifdef _DEBUG c`lJu_  
#define new DEBUG_NEW JOjoiA  
#undef THIS_FILE 8<mjh0F-,  
static char THIS_FILE[] = __FILE__; Wv__ wZ  
#endif "dR |[a<#g  
#define IDM_SHELL WM_USER+1 2j(h+?N7k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IchCACK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J};z85B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 22kpl)vbU  
class CAboutDlg : public CDialog bifS 2>c  
{ Cv$ SJc  
 public: 2&+#Vsm`V  
  CAboutDlg(); h/x0]@M&  
  // Dialog Data _3]][a,  
  //{{AFX_DATA(CAboutDlg) kc7lc|'z  
  enum { IDD = IDD_ABOUTBOX }; 5L:1A2Z?c  
  //}}AFX_DATA ?JV|dM  
  // ClassWizard generated virtual function overrides Tirux ;  
  //{{AFX_VIRTUAL(CAboutDlg) 2tROT][J%  
 protected: :{NC-%4o0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kc/{[ME  
  //}}AFX_VIRTUAL )CX4kPj  
  // Implementation t_ksvWUo  
 protected: =%zLh<3v  
  //{{AFX_MSG(CAboutDlg) X2tk[Kr  
  //}}AFX_MSG {;2vmx9  
  DECLARE_MESSAGE_MAP() A2}Rl%+X]6  
}; 7_2kDDW0  
~gz^Cdh  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j)t+jcMUI  
{ 8/z3=O&  
 //{{AFX_DATA_INIT(CAboutDlg) =A Vg Iv  
 //}}AFX_DATA_INIT 9h/>QLx  
} GE>[*zN  
.^$YfTabq  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T[= S$n -'  
{ <p;k)S2J  
 CDialog::DoDataExchange(pDX); lTU$0CG  
 //{{AFX_DATA_MAP(CAboutDlg) $A3<G-4O  
 //}}AFX_DATA_MAP pT?Q#,fh  
} uxg9yp@|  
~}K5#<   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) lnE+Au'  
 //{{AFX_MSG_MAP(CAboutDlg) +n}$pM|NKU  
 // No message handlers 65ly2gl  
 //}}AFX_MSG_MAP DO7W}WU  
END_MESSAGE_MAP() $D31Q[p=+  
9 2MTX Osp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nUq<TJ  
: CDialog(CCaptureDlg::IDD, pParent) p;?*}xa  
{ _2btfY1U  
 //{{AFX_DATA_INIT(CCaptureDlg) +i\&6HGK;-  
  m_bControl = FALSE; %3HVFhl  
  m_bAlt = FALSE; Yxv9  
  m_bShift = FALSE; P;PQeXKw  
  m_Path = _T("c:\\"); &D%(~|'  
  m_Number = _T("0 picture captured."); KYJjwXT28W  
  nCount=0; Y^%T}yTtq  
  bRegistered=FALSE; `>DP,D)w(  
  bTray=FALSE; *&AfR8x_z  
 //}}AFX_DATA_INIT s] /tYJYl  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1Y_w5dU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); vd`}/~o  
} nN$Y(2ZN  
+!f=jg06  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y}C`&nW[=  
{ 2cu#lMq  
 CDialog::DoDataExchange(pDX); 7?OH,^  
 //{{AFX_DATA_MAP(CCaptureDlg) N8KQz_]9I  
  DDX_Control(pDX, IDC_KEY, m_Key); >hY" 3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _WX#a|4h{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W&h[p_0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QrApxiw  
  DDX_Text(pDX, IDC_PATH, m_Path); B7\k< Nit0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @?C#r.vgp  
 //}}AFX_DATA_MAP  n6F/Ac:  
} co _oMc  
ZxGP/D  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R];Ox e  
//{{AFX_MSG_MAP(CCaptureDlg) s=?aox7  
 ON_WM_SYSCOMMAND() X &2oPo  
 ON_WM_PAINT() K; FW  
 ON_WM_QUERYDRAGICON() 5 =(c%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ba\6?K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ThW,Y" l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,_!6U  
//}}AFX_MSG_MAP \qsw"B*tv`  
END_MESSAGE_MAP() UDf9FnG}L  
wwKh CmH  
BOOL CCaptureDlg::OnInitDialog() Gf8s?l  
{ AvR2_  
 CDialog::OnInitDialog(); v+6@ cC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %}2@rLP  
 ASSERT(IDM_ABOUTBOX < 0xF000); r!}al5~&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W{XkV Ke1a  
 if (pSysMenu != NULL) Z,N$A7SBE  
 { x0a.!  
  CString strAboutMenu; {#IPf0O  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `ir3YnT+  
  if (!strAboutMenu.IsEmpty()) fpM #XFj  
  { ~Lfcg*  
   pSysMenu->AppendMenu(MF_SEPARATOR); }aB#z<B6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); F?Ju?? O  
  } "Clz'J]{  
 } ,1Qd\8N9  
 SetIcon(m_hIcon, TRUE); // Set big icon b(GFMk  
 SetIcon(m_hIcon, FALSE); // Set small icon c*\<,n_  
 m_Key.SetCurSel(0); ~ aZedQc  
 RegisterHotkey(); hwnx<f '  
 CMenu* pMenu=GetSystemMenu(FALSE); b M;`s5d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); B68H&h]D#'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); rl:KJ\*D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !- C' }  
 return TRUE; // return TRUE unless you set the focus to a control EruP  
} ~7quTp)  
9-*NW0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F-n"^.7  
{ j{#Wn !,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B7Ntk MK  
 { z?8~[h{i%  
  CAboutDlg dlgAbout; ;mm!0]V  
  dlgAbout.DoModal(); %@& a7JOL  
 } #*q2d  
 else @b!"joEy  
 { k D~uGA  
  CDialog::OnSysCommand(nID, lParam); pL oy  
 } <v]9lw'  
} }4jC_ZAupt  
TmEY W<  
void CCaptureDlg::OnPaint() T!q_/[i~7  
{ P1 +"v*  
 if (IsIconic()) \Z5 +$Ij  
 { T)u4S[ &  
  CPaintDC dc(this); // device context for painting ;M v~yb3v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); y<r}"TAf-  
  // Center icon in client rectangle H^c0Kh+  
  int cxIcon = GetSystemMetrics(SM_CXICON); vM0_>1nN  
  int cyIcon = GetSystemMetrics(SM_CYICON); sn\;bq  
  CRect rect; mE $dO3  
  GetClientRect(&rect); ~bU7QLr  
  int x = (rect.Width() - cxIcon + 1) / 2; 1/j$I~B   
  int y = (rect.Height() - cyIcon + 1) / 2; Y'm=etE  
  // Draw the icon OS7R Qw1  
  dc.DrawIcon(x, y, m_hIcon); \&|CM8A  
 } c cG['7  
 else ?#[)C=p]z  
 { &H;8QZ8uw  
  CDialog::OnPaint(); /J%do]PDl  
 } k0K A~  
} 5rN _jC*U  
Ghv{'5w  
HCURSOR CCaptureDlg::OnQueryDragIcon() bAhZ7;T~  
{ UOI^c  
 return (HCURSOR) m_hIcon; eqzTQen8q  
} tjzA)/T,4  
~ l )t|'6  
void CCaptureDlg::OnCancel() a|x8=H  
{ sWxK~Yg  
 if(bTray) 0<P(M:a  
  DeleteIcon(); }""p)Y&  
  CDialog::OnCancel(); jn=ug42d  
} X\A]"su  
wa?+qiWnrl  
void CCaptureDlg::OnAbout() `ut)+T V  
{ qzdaN5  
 CAboutDlg dlg; pcpxe&S  
 dlg.DoModal(); [\HQPo'S  
} K`+vfqX  
A~y VYC6l  
void CCaptureDlg::OnBrowse() D0%FELG05  
{  q6)N*?  
 CString str; MSB%{7'o  
 BROWSEINFO bi; Uz>Yn&{y6  
 char name[MAX_PATH]; @a;sV!S{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &t[|%c*D&  
 bi.hwndOwner=GetSafeHwnd(); `QLowna  
 bi.pszDisplayName=name;  HD|sr{Z%  
 bi.lpszTitle="Select folder"; vahf]2jEB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  sL ~,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @^HwrwRA  
 if(idl==NULL) 9S"N4c>  
  return; _W+Q3Jx-(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7K !GK  
 str.ReleaseBuffer(); .HOY q  
 m_Path=str; A:xb!= 2  
 if(str.GetAt(str.GetLength()-1)!='\\') TAAR'Jz S  
  m_Path+="\\"; &Q+]t"OA!  
 UpdateData(FALSE); VD4S_qx  
} Ltg-w\?]  
5=.7\#D  
void CCaptureDlg::SaveBmp() h9Z[z73_a  
{ u= l0f6W  
 CDC dc; lYdQB[l  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); nO:HB.&@  
 CBitmap bm; QS%,7'EG  
 int Width=GetSystemMetrics(SM_CXSCREEN); e mC\i  
 int Height=GetSystemMetrics(SM_CYSCREEN); )_F(H)*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Lqq*Nr  
 CDC tdc; SE-} XI\  
 tdc.CreateCompatibleDC(&dc); |'@V<^GR  
 CBitmap*pOld=tdc.SelectObject(&bm); .yG8B:7N2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2}>go^#O/w  
 tdc.SelectObject(pOld); M+\rX1T  
 BITMAP btm; w0\4Wa  
 bm.GetBitmap(&btm); iF+S%aPd#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q>c+bo 6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JH-nvv  
 BITMAPINFOHEADER bih; P)4x   
 bih.biBitCount=btm.bmBitsPixel; @V7;TJk  
 bih.biClrImportant=0; XZ; *>(  
 bih.biClrUsed=0; u`nt\OF  
 bih.biCompression=0; bQ i<0|S  
 bih.biHeight=btm.bmHeight; ./2Z?,  
 bih.biPlanes=1; *di&%&f  
 bih.biSize=sizeof(BITMAPINFOHEADER); =CGD ~p`  
 bih.biSizeImage=size; }q/(D?  
 bih.biWidth=btm.bmWidth; 6@i|Kw(:  
 bih.biXPelsPerMeter=0; 6{lG1\o  
 bih.biYPelsPerMeter=0; ,WzG.3^m  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +q$xw}+PK  
 static int filecount=0; ;}$Z 80  
 CString name; PV?1g|tYv  
 name.Format("pict%04d.bmp",filecount++); w 5!ndu  
 name=m_Path+name; ttTI#Fr2  
 BITMAPFILEHEADER bfh; ;sm"\.jF  
 bfh.bfReserved1=bfh.bfReserved2=0; Dg1kbO=2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p3{x<AO/  
 bfh.bfSize=54+size; {/th`#o4b  
 bfh.bfOffBits=54; >2 FAi.,  
 CFile bf; 5~v(AB(x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X!7 c zt  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^mS.HT=X  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?r^ hm u"a  
  bf.WriteHuge(lpData,size); _K*\}un2  
  bf.Close(); 5@GD} oAn6  
  nCount++; Fc34Y0_A  
 } jdV .{8@  
 GlobalFreePtr(lpData); Tz+HIUIxF  
 if(nCount==1) jsK|D{m?  
  m_Number.Format("%d picture captured.",nCount); f)p>nW?Z  
 else @>qx:jx(-S  
  m_Number.Format("%d pictures captured.",nCount); a!TBk=P  
  UpdateData(FALSE); GhSL%y  
} {QIS411  
YlZYS'_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e|2vb GQ  
{ qAS70XjOF  
 if(pMsg -> message == WM_KEYDOWN) >X-ed  
 { {mCKTyN+  
  if(pMsg -> wParam == VK_ESCAPE) [=]+lei  
   return TRUE; b#?ai3E  
  if(pMsg -> wParam == VK_RETURN) 12%z3/i  
   return TRUE; l044c,AW(  
 } f.U0E6-(3N  
 return CDialog::PreTranslateMessage(pMsg); }1X11+/W  
} {<''OwQF~+  
9 AQ96  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "z{_hp{T^  
{ a2(D!_dZR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z`SWZ<  
  SaveBmp(); F]URf&U  
  return FALSE; X]3l| D  
} CrRQPgl+u  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *_2O*{V  
 CMenu pop; mMD$X[:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1)P<cNj  
 CMenu*pMenu=pop.GetSubMenu(0); 8|S1|t,  
 pMenu->SetDefaultItem(ID_EXITICON); vy2*BTU?  
 CPoint pt; -@gJqoo>  
 GetCursorPos(&pt); gLXvw]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); onWYT}c{  
 if(id==ID_EXITICON) +7U  A%q  
  DeleteIcon(); a`[?,W:q  
 else if(id==ID_EXIT) BCa90  
  OnCancel(); A9fjMnw  
 return FALSE; yP<:iCY  
} U 3wsWSO  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d @^o/w8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) I9Edw]  
 AddIcon(); [+:mt</HN  
 return res; G]m[ S-  
} & 8:iB {n  
K 8yyxJ  
void CCaptureDlg::AddIcon() /`j  K  
{ VAF:Z  
 NOTIFYICONDATA data; "S{6LWkD  
 data.cbSize=sizeof(NOTIFYICONDATA); O_ s9  
 CString tip; oC@"^>4  
 tip.LoadString(IDS_ICONTIP); 4? /ot;>2  
 data.hIcon=GetIcon(0); y ? {PoNI  
 data.hWnd=GetSafeHwnd(); 5wE !_ng>|  
 strcpy(data.szTip,tip); a?U%l9F  
 data.uCallbackMessage=IDM_SHELL; om*tdG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L[QI 5N  
 data.uID=98; S7#^u`'Q_^  
 Shell_NotifyIcon(NIM_ADD,&data); )l[7;ZIw$  
 ShowWindow(SW_HIDE); DoCQFSL  
 bTray=TRUE; &]"_pc/>m  
} 33v%e  
MSYLkQ}_b  
void CCaptureDlg::DeleteIcon() u%gm+NneK  
{ $V{- @=  
 NOTIFYICONDATA data; 8^f[-^%  
 data.cbSize=sizeof(NOTIFYICONDATA); 1,;qXMhK`;  
 data.hWnd=GetSafeHwnd(); gS(: c .  
 data.uID=98; 7,&]1+n  
 Shell_NotifyIcon(NIM_DELETE,&data); )*$  
 ShowWindow(SW_SHOW); m|?" k38  
 SetForegroundWindow(); 9>$%F;JP44  
 ShowWindow(SW_SHOWNORMAL); 3/SqXu  
 bTray=FALSE; BB73' W8y  
} )l!&i?h%  
onJ[&f  
void CCaptureDlg::OnChange() WX[dM }L  
{ U}vtVvx  
 RegisterHotkey(); |\r\i&|g1  
} dv4r\ R^  
I` n1M+=%  
BOOL CCaptureDlg::RegisterHotkey() gQ+_&'C  
{ /wCxf5q0  
 UpdateData(); n4d(`  
 UCHAR mask=0; [F>n!`8  
 UCHAR key=0; cdU >iB,  
 if(m_bControl) j"$b%|  
  mask|=4; u!EulAl  
 if(m_bAlt) $gD(MKR)~  
  mask|=2; /RULPd PH  
 if(m_bShift) [Xo J7  
  mask|=1; AdN= y8T  
  key=Key_Table[m_Key.GetCurSel()]; },QFyT  
 if(bRegistered){ 5bqYi  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;uo|4?E:\(  
  bRegistered=FALSE; QX~72X=(  
 } U-^S<H  
 cMask=mask; $MVeMgPa  
 cKey=key; E6&uZr  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [?r\b  
 return bRegistered; eEds-&_  
} ;7og  
nh.v?|  
  四、小结 6I.+c  
GMp'KEQQ  
  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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