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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: ,=Nw(GI  
  `_1(Q9Q  
  一、实现方法 \$'m ^tVU  
R6Zj=l[  
  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: (.,'}+1  
8pPC 9ew\=  
#pragma data_seg("shareddata") ,|.8nk"  
HHOOK hHook =NULL; //钩子句柄 vK6ibl0  
UINT nHookCount =0; //挂接的程序数目 bEBBwv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 QtY hg$K3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 I f3{E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5@czK*5  
static int KeyCount =0; rX33s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vm\wO._  
#pragma data_seg() 7}ws |4Y  
rFmKmV  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ;8*XOC;[  
_[OF"X2  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: [DZqCo  
mRhd/|g*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "1XXE3^^  
cKey,UCHAR cMask) YDQ:eebg(  
{ zoZ<)x=;  
 BOOL bAdded=FALSE; TGU:(J'^  
 for(int index=0;index<MAX_KEY;index++){ Ap5}5 ewM  
  if(hCallWnd[index]==0){ _wf5%(~b  
   hCallWnd[index]=hWnd; \  Md 3  
   HotKey[index]=cKey; q$r&4s)To  
   HotKeyMask[index]=cMask; XE_ir Et  
   bAdded=TRUE; q#P$'7"  
   KeyCount++; ?X\3&Ujy$  
   break; '_:(oAi,C  
  } XJqTmj3   
 } :e*DTVv8  
 return bAdded; eR:b=%T8  
} lnS(&`oh\=  
//删除热键 gtiEhCF2W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dsJm>U)  
{ >F1G!#$0  
 BOOL bRemoved=FALSE; xc9YM0B&  
 for(int index=0;index<MAX_KEY;index++){ m9in1RI%  
  if(hCallWnd[index]==hWnd){ M=OCz gj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,57$N&w  
    hCallWnd[index]=NULL; vw2`:]Q+  
    HotKey[index]=0; 'JieIKu  
    HotKeyMask[index]=0; cHx%Nd\  
    bRemoved=TRUE; &-%>q B|*  
    KeyCount--; b_TS<,  
    break; B z^|SkEit  
   } 7p.>\YtoR}  
  } xl(@C*.sC1  
 } G O{ . 9_2  
 return bRemoved; ~. YWV  
} $Az^Y0[D  
Y4E/?37j  
*)<B0SjT  
  DLL中的钩子函数如下: .~>?*}  
~gE:-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xe4Oxo  
{ |F[=b'?  
 BOOL bProcessed=FALSE; r@U3sO#N  
 if(HC_ACTION==nCode) .pPm~2]z  
 {  foRD{Hx  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )w h%|  
   switch(wParam) 7a4o1;l  
   {  D}3T|N  
    case VK_MENU: yNg9X(U  
     MaskBits&=~ALTBIT; >j*;vG5T  
     break; h6_(?|:-(  
    case VK_CONTROL: jN31hDg<z  
     MaskBits&=~CTRLBIT; "9!d]2.-Vk  
     break; K+*Q@R D  
    case VK_SHIFT: 0 B@n{PvR0  
     MaskBits&=~SHIFTBIT; ~y HU^5D  
     break; tVuWVJ4M  
    default: //judge the key and send message E/M_lvQ  
     break; k%s_0 @  
   } #Z+i~t{e(  
   for(int index=0;index<MAX_KEY;index++){ ~{hxR)x9  
    if(hCallWnd[index]==NULL) Q?b14]6im  
     continue; YB<*"HxM)}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j#r6b]k(Hv  
    { z]B]QB Y[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7SDFz}  
     bProcessed=TRUE; K<?nq0-  
    } &Z(K6U#.  
   } L86n}+ P\  
  } j',W 64  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]Chj T}  
   switch(wParam) hfpJ+[  
   { Vk< LJ S  
    case VK_MENU: +uay(3m((  
     MaskBits|=ALTBIT; mc=LP>uoS  
     break; X%yO5c\l2  
    case VK_CONTROL: C{TA.\   
     MaskBits|=CTRLBIT; +"9hWb5  
     break; W3`>8v1?o  
    case VK_SHIFT: NM ]bgpP  
     MaskBits|=SHIFTBIT; %%(R@kh9  
     break; x.Q&$#  
    default: //judge the key and send message 3u%{dGa  
     break; 06jqQ-_`h  
   } 8~5cJPi6  
   for(int index=0;index<MAX_KEY;index++){ v<Bynd-  
    if(hCallWnd[index]==NULL) j*~T1i  
     continue; pp9Zb.D\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %Uz(Vd#K  
    { apE   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z7 E  
     bProcessed=TRUE; N},n `Yl.  
    } 1S@vGq}  
   } as J)4ema  
  } |_u aS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Web|\CH  
   for(int index=0;index<MAX_KEY;index++){ IIq1\khh  
    if(hCallWnd[index]==NULL) mrX^2SR  
     continue; }NsUnbxT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CKA;.sh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7Pa@1']  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;E'"Ks[GH  
   } {[+2n]f_G  
  } !0N7^Z"gtz  
 }  6m6zA/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); IgC}&  
} 6 PxW8pn  
['ksP-=  
  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:  x]z2Z*  
8/K!SpM*d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t!I aUW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  YBnA+l*  
@u1zB:  
  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: !Kv@\4  
d:F @a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t+Op@*#%  
{ VM0j`bs'K*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) h`3eu;5)  
 { #0Tq=:AE>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T,$WlK Wj  
  SaveBmp(); [}fv  dW  
  return FALSE; xz:J  
 } pD&& l!i&[  
 …… //其它处理及默认处理 *& m#qEv  
} Ve 4u +0  
>fIk;6<{  
}Nb8}(6  
  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。 _ A 0w[n  
y7^{yS[,  
  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。 m:hY`[ f6  
Xb QlHfrS  
  二、编程步骤 lq"f[-8a2q  
c_" ~n|  
  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"; %r+vSGt;5  
%K]euEqs  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; PpsIhMq@  
<ioO,oS'  
  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; v|E"[P2e  
95<EN (oUD  
  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; 8KH\`5<  
nW|wY.  
  5、 添加代码,编译运行程序。 $fgf Y8  
c=AOkX3UD  
三、程序代码 A0%}v*  
jVH|uX"M5Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL i%6;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) jP~Z`y f  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ G/v/+oX  
#if _MSC_VER > 1000 t^ZV|s 1  
#pragma once 9!><<7TS  
#endif // _MSC_VER > 1000 u=YX9Mo!  
#ifndef __AFXWIN_H__ apk4 j\i?5  
#error include 'stdafx.h' before including this file for PCH I=;+n-  
#endif fo4.JyBk  
#include "resource.h" // main symbols )z8!f}:De=  
class CHookApp : public CWinApp FW"^99mrnb  
{ ~y$ !48o  
 public: 0<TD/1wN  
  CHookApp(); -8N|xQ378  
  // Overrides MC&\bf  
  // ClassWizard generated virtual function overrides Zatf9yGD  
  //{{AFX_VIRTUAL(CHookApp) VxzkQ}o  
 public: <58l;<0  
  virtual BOOL InitInstance(); Z@gnsPN^r  
  virtual int ExitInstance(); LJVG~Yeo  
  //}}AFX_VIRTUAL it2 a  
  //{{AFX_MSG(CHookApp) Db"DG(  
  // NOTE - the ClassWizard will add and remove member functions here. +wW@'X  
  // DO NOT EDIT what you see in these blocks of generated code ! s6o>m*{  
  //}}AFX_MSG BGr.yEy  
  DECLARE_MESSAGE_MAP() FecktD=  
}; C>Is1i^9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .qob_dRA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vKoP|z=m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YwcPX`eg  
BOOL InitHotkey(); 6x=YQwn~  
BOOL UnInit(); H.G!A6bd  
#endif 8e0."o.6  
h.K(P+h  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^nVl (^{  
#include "stdafx.h" EC<b3  
#include "hook.h" zdSh:  
#include <windowsx.h> m=qOg>k  
#ifdef _DEBUG woq)\;CK  
#define new DEBUG_NEW HEA eo!  
#undef THIS_FILE x|eeRf|  
static char THIS_FILE[] = __FILE__; f=J<*h  
#endif ,)~E>[=+  
#define MAX_KEY 100 z1,tJH0  
#define CTRLBIT 0x04 b]gY~cbI8  
#define ALTBIT 0x02 A\te*G0:S  
#define SHIFTBIT 0x01 /)uM[ dnai  
#pragma data_seg("shareddata") 1@XgTL4  
HHOOK hHook =NULL; ;LJ3c7$@lf  
UINT nHookCount =0; 5|$a =UIR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `Iy4=nVb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT e,A)U5X  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?a/n<V '  
static int KeyCount =0; ! d9AG|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift IPA*-I57  
#pragma data_seg() fMK#x\.4  
HINSTANCE hins; )"O{D`uX  
void VerifyWindow(); Uedvc5><t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u}H$-$jE  
//{{AFX_MSG_MAP(CHookApp) $R{8z-,Q  
// NOTE - the ClassWizard will add and remove mapping macros here. "EftN5?/  
// DO NOT EDIT what you see in these blocks of generated code! 1(`M~vFDK  
//}}AFX_MSG_MAP |k-XBp  
END_MESSAGE_MAP() {w`:KR6o7  
&A50'8B2A  
CHookApp::CHookApp() )wf\F6jN  
{ +AQDD4bu  
 // TODO: add construction code here, J l7z|QS  
 // Place all significant initialization in InitInstance m=&j@  
} Go+[uY^  
?9U:g(v  
CHookApp theApp; J^H =i)A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) StQ@g  
{ P%o44|[][  
 BOOL bProcessed=FALSE; _dmL}t-  
 if(HC_ACTION==nCode) cNP/<8dq  
 { A_r<QYq0|  
  if((lParam&0xc0000000)==0xc0000000){// Key up >riq98Us/  
   switch(wParam) Lk(S2$)*  
   { $N.`)S<  
    case VK_MENU: WV_`1hZX  
     MaskBits&=~ALTBIT; >C2HC6O3  
     break;  ~u/@rqF  
    case VK_CONTROL: |[w^eg  
     MaskBits&=~CTRLBIT; =WRO\lgv.  
     break; @6%gIsj<H  
    case VK_SHIFT: F X 1C e  
     MaskBits&=~SHIFTBIT; R@ QQNYU.D  
     break; 2NR7V*A  
    default: //judge the key and send message 2}`R"MeS  
     break; .;%q/hP  
   } |4xo4%BQ>  
   for(int index=0;index<MAX_KEY;index++){ 2 zl~>3S  
    if(hCallWnd[index]==NULL) *SGlqR['\e  
     continue; ,|x\MHd?t_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  tJ1-DoU  
    { C >kmIw'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #L1>dHhat  
     bProcessed=TRUE; GXEcpc08  
    } g$gS7!u,  
   } G:hU{S7  
  } 3*2I$e!Jt  
  else if((lParam&0xc000ffff)==1){ //Key down ,7I},sZj   
   switch(wParam) /.2u.G  
   { 8vO;IK]9b^  
    case VK_MENU: Uir*%*4:  
     MaskBits|=ALTBIT; -4%]QS  
     break; DOT=U _  
    case VK_CONTROL: Rj&qh`  
     MaskBits|=CTRLBIT; @jKDj]\  
     break; +0U#.|?  
    case VK_SHIFT: &! OGIYC(  
     MaskBits|=SHIFTBIT; iW;}%$lVX  
     break; !4pr{S  
    default: //judge the key and send message ?Oqzd$-  
     break; }!=gP.Zu^  
   } ,FY-d$3)  
   for(int index=0;index<MAX_KEY;index++) PM8Ks?P#u  
   { SF"#\{cjj  
    if(hCallWnd[index]==NULL) ] ZDTn  
     continue; Pu-p7:99;'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `,Xb8^M2  
    { -E}>h[;qZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U>in2u 9  
     bProcessed=TRUE; =MCNCV/<  
    } "bPCOJ[v9  
   } kq>GMUl~@  
  } 3;y_qwA  
  if(!bProcessed){ ^l--zzO 8l  
   for(int index=0;index<MAX_KEY;index++){ 6NzBpur 2H  
    if(hCallWnd[index]==NULL) amMjuyW  
     continue; B>sCP"/uV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O@nqHZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ujiZM  
   } I/Sv"X6E  
  } Q! Kn|mnN  
 } O+p]3u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E2Us#a  
} ud yAP>  
-xw 98  
BOOL InitHotkey() kxygf9I!;  
{ :G^"e  
 if(hHook!=NULL){ XpR.rq$]  
  nHookCount++; EbG_43SV  
  return TRUE; e)*mC oR  
 } "fRlEO[9  
 else $< A8gTJ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v>rqOI  
  if(hHook!=NULL)   YfTd  
   nHookCount++; ?F)_T  
  return (hHook!=NULL); y=-{Q  
} Y=5!QLV4  
BOOL UnInit() cC b>zI  
{ #D/$6ah~m  
 if(nHookCount>1){ C]yvK}  
  nHookCount--; J f\Qf  
  return TRUE; )WaX2uDA?  
 } NdM}xh  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M7`UoTc+>d  
 if(unhooked==TRUE){ "CIpo/ebL  
  nHookCount=0; }UyzM y,  
  hHook=NULL; ' %bj9{(0  
 } \7|s$ XQ\  
 return unhooked; r$b:1C~  
} {KW&wsI  
2Som0T<2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #cw! &  
{ /uy&2l  
 BOOL bAdded=FALSE; uU8*$+ "  
 for(int index=0;index<MAX_KEY;index++){ d[~au=b  
  if(hCallWnd[index]==0){ F7k4C2r  
   hCallWnd[index]=hWnd; G/x3wR  
   HotKey[index]=cKey; @"q~ AY  
   HotKeyMask[index]=cMask; PiIp<fJd$  
   bAdded=TRUE; Da9*/  
   KeyCount++; rg#qSrHp  
   break; d+gk q\  
  } ?TL2'U|M  
 } 9Q SUCN_  
 return bAdded; r?Ev.m  
} J8qu]{0I"  
[8V(N2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a}^!TC>%1i  
{ 5n|MA  
 BOOL bRemoved=FALSE; S>/I?(J  
 for(int index=0;index<MAX_KEY;index++){ 'W<a54T?z  
  if(hCallWnd[index]==hWnd){ ZI#SYEF6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [T$$od[.  
    hCallWnd[index]=NULL; BDB zc5Q(  
    HotKey[index]=0; (&N$W&  
    HotKeyMask[index]=0; h0y\,iWXb  
    bRemoved=TRUE; PBP J/puW  
    KeyCount--; B?/12+sR  
    break; OTy 4"%  
   } z=8_%r  
  } K|Ij71  
 } =8VJ.{xy_e  
 return bRemoved; {~B4F}ES  
} ( .6tz  
%_i0go,^  
void VerifyWindow() b`;b}ug  
{ Jn^Wzn[q  
 for(int i=0;i<MAX_KEY;i++){ WLj_Zo*^x  
  if(hCallWnd!=NULL){ FdK R{dX}  
   if(!IsWindow(hCallWnd)){ #L1yL<'  
    hCallWnd=NULL; @Ig,_i\UY:  
    HotKey=0; ZP G8q  
    HotKeyMask=0; YM,D`c[pX  
    KeyCount--; ,y{fqa4  
   } p%M(G#gOgP  
  } zqE8PbU0M;  
 } *rMN,B@  
} _o=`-iy9  
#@OKp,LJ  
BOOL CHookApp::InitInstance() $K>d\{@+7  
{ ^ 8Nr %NJ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0%L$TJ.''  
 hins=AfxGetInstanceHandle(); ?2bE=|  
 InitHotkey(); t+Tg@~K2[>  
 return CWinApp::InitInstance(); ;lPhSkD  
} l#(g&x6J  
? wiq 3f6  
int CHookApp::ExitInstance() qi5>GX^t]b  
{ Ns7l-mb  
 VerifyWindow(); 0i1?S6]d-  
 UnInit(); @eD~FNf-]  
 return CWinApp::ExitInstance(); @X / =.  
} :~YyHX  
FU3IK3}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &I">{J<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0|3B8m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *g_>eNpXD  
#if _MSC_VER > 1000 bsS| !KT  
#pragma once 6/[h24d  
#endif // _MSC_VER > 1000 !ilDR<  
oFA$X Y  
class CCaptureDlg : public CDialog fwGz00C/U  
{ I,q~*d  
 // Construction < 2r#vmM  
 public: S%%qn  
  BOOL bTray; 1JY90l$ME  
  BOOL bRegistered; u(Q(UuI  
  BOOL RegisterHotkey(); Y+PxV*"a  
  UCHAR cKey; uX!y,a/"  
  UCHAR cMask; mTu9'/$(  
  void DeleteIcon(); (W6\%H2u  
  void AddIcon(); &?6 ~v  
  UINT nCount; trA `l/  
  void SaveBmp(); )4O`%9=M&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;:YjgZ:+Q]  
  // Dialog Data Pg}G4L?H;J  
  //{{AFX_DATA(CCaptureDlg)    r3K:  
  enum { IDD = IDD_CAPTURE_DIALOG }; v\T1,Z@N^  
  CComboBox m_Key; 3om7LqcRo  
  BOOL m_bControl; ^E,Uc K;  
  BOOL m_bAlt; y(g Otg  
  BOOL m_bShift; DdW8~yI&  
  CString m_Path; 6:X\vw  
  CString m_Number; $G.|5sEk  
  //}}AFX_DATA N>iCb:_ T;  
  // ClassWizard generated virtual function overrides 6 6;O3g'  
  //{{AFX_VIRTUAL(CCaptureDlg) T+( A7Qrx%  
 public: UYLI>XSd  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $VNn`0^gF  
 protected: G->@   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uU"s50m  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jk{2!uP  
  //}}AFX_VIRTUAL NV~i4R*#  
  // Implementation iIRigW  
 protected: b8Sl3F?-~  
  HICON m_hIcon; w N.Jyb  
  // Generated message map functions SpQ6A]M gm  
  //{{AFX_MSG(CCaptureDlg) =i<(hgD  
  virtual BOOL OnInitDialog(); $l0w{m!P  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); oDK\v8w-  
  afx_msg void OnPaint(); Z 0^d o  
  afx_msg HCURSOR OnQueryDragIcon(); Ue%5 :Sdr  
  virtual void OnCancel(); g_=ZcGC  
  afx_msg void OnAbout(); /zAx`H  
  afx_msg void OnBrowse(); J>&GP#7}  
  afx_msg void OnChange(); }R(_^@ ]  
 //}}AFX_MSG <ZEll[0L  
 DECLARE_MESSAGE_MAP() 'JVvL  
}; <#Dc(VhT  
#endif UNHHzTsr?  
n_Dhq(.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /vKDlCH*  
#include "stdafx.h" U^I'X7`r  
#include "Capture.h" +/'jX?7x%  
#include "CaptureDlg.h" [)?3Dp|MH  
#include <windowsx.h> `MS=/xE  
#pragma comment(lib,"hook.lib") it@s(1EO#  
#ifdef _DEBUG ^TGHWCK!t  
#define new DEBUG_NEW Uyh#g^r  
#undef THIS_FILE ycN_<  
static char THIS_FILE[] = __FILE__; =r2d{  
#endif  8j k*N  
#define IDM_SHELL WM_USER+1 ?CC6/bE-{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @AFLFX]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bB["Qd}Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; wl4yNC  
class CAboutDlg : public CDialog g`1i[Iu2  
{ X"]ZV]7(]s  
 public: bhRpYP%x  
  CAboutDlg(); gQ[4{+DSf  
  // Dialog Data 5sH ee,  
  //{{AFX_DATA(CAboutDlg) D {mu2'q  
  enum { IDD = IDD_ABOUTBOX }; cVMTT]cj1  
  //}}AFX_DATA Ic*Q(X  
  // ClassWizard generated virtual function overrides F&Gb[Q&a8  
  //{{AFX_VIRTUAL(CAboutDlg) DbDpdC;  
 protected: |[ge ,MO:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \n5,!,A  
  //}}AFX_VIRTUAL _Cxs"to  
  // Implementation q^s$4q  
 protected: L\UYt\ks  
  //{{AFX_MSG(CAboutDlg) c~V\,lcI  
  //}}AFX_MSG 9Ah4N2nL-b  
  DECLARE_MESSAGE_MAP() hE;  
}; *(rq AB0~  
w/&#UsEIr  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Vrnx# j-U  
{ |Qm 7x[i  
 //{{AFX_DATA_INIT(CAboutDlg) 0@ -LV:jU  
 //}}AFX_DATA_INIT qU"+0t4  
} OlP#|x*  
&0 @2JS/!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) bNXT*HOZb3  
{ j,~h:MT  
 CDialog::DoDataExchange(pDX); aJub("  
 //{{AFX_DATA_MAP(CAboutDlg) Z@1rs#  
 //}}AFX_DATA_MAP t ({:TQ  
} !a  /  
-G{}8GM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) MQhL>oQ  
 //{{AFX_MSG_MAP(CAboutDlg) c(o8uWn  
 // No message handlers X@ TQD  
 //}}AFX_MSG_MAP n84*[d}t  
END_MESSAGE_MAP() :}Z+K*%o-  
|S/nq_g]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t/HE@xPxI5  
: CDialog(CCaptureDlg::IDD, pParent) Yk:\oM   
{ t; "o,T  
 //{{AFX_DATA_INIT(CCaptureDlg) pZXva9bE  
  m_bControl = FALSE; @;pTQ 5 I  
  m_bAlt = FALSE; n:HF&j4C,  
  m_bShift = FALSE; 0nBAO  
  m_Path = _T("c:\\"); k5|h8%h8  
  m_Number = _T("0 picture captured."); EyozhIV  
  nCount=0; oveW)~4  
  bRegistered=FALSE; y;uk|#qnPS  
  bTray=FALSE;  dY|(  
 //}}AFX_DATA_INIT eQA89 :j,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e:&5Cvx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *Z Aue.  
} D[ny%9 :  
VDBP]LRF  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H+t^eg88  
{ /&a[D 2  
 CDialog::DoDataExchange(pDX); a,!c6'QE  
 //{{AFX_DATA_MAP(CCaptureDlg) S'lZ'H/  
  DDX_Control(pDX, IDC_KEY, m_Key); cW%F%:b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); MYDAS-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); uee2WGD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); nTyK Z(#u  
  DDX_Text(pDX, IDC_PATH, m_Path); a8Nl' f*0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Jr|"`f%V  
 //}}AFX_DATA_MAP bR(rZu5  
} hVd% jU:  
9ssTG4Sa  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) m6bAvy]3<t  
//{{AFX_MSG_MAP(CCaptureDlg) ]`b/_LJN$F  
 ON_WM_SYSCOMMAND() IR(qjm\V  
 ON_WM_PAINT() /z.Y<xOc  
 ON_WM_QUERYDRAGICON() jA?A)YNQb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !"Jne'f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) An{`'U(l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Usx8  U  
//}}AFX_MSG_MAP ZBUEg7c  
END_MESSAGE_MAP() 5hF iK K7  
p Wa'Fd  
BOOL CCaptureDlg::OnInitDialog() 8M <q-sn4B  
{ -~n^?0  
 CDialog::OnInitDialog(); JK) )Cuh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]%>7OH'  
 ASSERT(IDM_ABOUTBOX < 0xF000); x1VBO.t=*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Uus%1hC%a  
 if (pSysMenu != NULL) P/6$ T2k_  
 { SaceIV%(  
  CString strAboutMenu; ek\8u`GC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @TBcVHy  
  if (!strAboutMenu.IsEmpty()) v'na{"  
  { dCc"Qr[k  
   pSysMenu->AppendMenu(MF_SEPARATOR); HqC 1Dkw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [CxnGeKK  
  } :59fb"^$  
 } E}6q;"[  
 SetIcon(m_hIcon, TRUE); // Set big icon 5ar2Y$bY  
 SetIcon(m_hIcon, FALSE); // Set small icon rH Y SS0*3  
 m_Key.SetCurSel(0); \vwsRT 1  
 RegisterHotkey(); kd55y  
 CMenu* pMenu=GetSystemMenu(FALSE); t7#lRp&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X?'ShXI  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v3\ |  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I "Qf};n  
 return TRUE; // return TRUE unless you set the focus to a control 1'Sr0 oEd3  
} W3Gg<!*Uo  
,jH<i.2R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) oW ! Z= ;  
{ a9LK}xc={  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) skaPC#u  
 { r{LrQ  
  CAboutDlg dlgAbout; IhR;YM[K  
  dlgAbout.DoModal(); ~t=73 fwB  
 } 0+3_CS++r  
 else ?58,Ja  
 { ce56$L8[  
  CDialog::OnSysCommand(nID, lParam);  {^8->V  
 } 7=3'PfS  
} CU`yi.)T{  
W _b!FQ]  
void CCaptureDlg::OnPaint() LC>bZ!(i#  
{ npCiqO  
 if (IsIconic()) rd_!'pG  
 { u=QG%O#B  
  CPaintDC dc(this); // device context for painting  Uf,fd  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); aw\0\'}  
  // Center icon in client rectangle &"gQrBa  
  int cxIcon = GetSystemMetrics(SM_CXICON); *`]#ntz9  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'g5 Gdn  
  CRect rect; $-w&<U$E  
  GetClientRect(&rect); ;z1\n3,  
  int x = (rect.Width() - cxIcon + 1) / 2; R3bHX%T  
  int y = (rect.Height() - cyIcon + 1) / 2; b[/uSwvi  
  // Draw the icon 'kb|!  
  dc.DrawIcon(x, y, m_hIcon); F1A7l"X]  
 } "3;b,<0  
 else Vi*HG &DD  
 { *Y]()#?Gr  
  CDialog::OnPaint(); DG-XX.:z  
 } qP5'&!s&!  
} Hx?OCGj=S*  
Yw6^(g8  
HCURSOR CCaptureDlg::OnQueryDragIcon() dWi:V 7t+  
{ gp(: o$  
 return (HCURSOR) m_hIcon; D.ERt)l>  
} iXPe  
yt[vd8O'c  
void CCaptureDlg::OnCancel() YIn H8Ex  
{ mx=2lL`  
 if(bTray) 231,v,X[  
  DeleteIcon(); .P#+V$qhv  
  CDialog::OnCancel(); cVf}8qf)  
} 1+ib(MJ<:#  
$'%.w|MJp  
void CCaptureDlg::OnAbout() ~\khwNA  
{ _eZ*_H,\  
 CAboutDlg dlg; Hw 1:zro  
 dlg.DoModal(); <,+nS%a  
} zPc kM)  
T=,A pa  
void CCaptureDlg::OnBrowse() yp?a7t M  
{ <! Z06  
 CString str; RAU"  
 BROWSEINFO bi; o"j$*o=  
 char name[MAX_PATH]; 3L^]J}|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e1/{bX5  
 bi.hwndOwner=GetSafeHwnd(); *?3c2Jg=E  
 bi.pszDisplayName=name; %EE Q ^lm  
 bi.lpszTitle="Select folder"; rsn^Y C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *O'`&J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0Zh]n;S3m  
 if(idl==NULL) !hjA   
  return; h>"j!|#!s  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YhQ%S}  
 str.ReleaseBuffer(); mX5%6{],  
 m_Path=str; $*+IsP!  
 if(str.GetAt(str.GetLength()-1)!='\\') 7m4*dBTr  
  m_Path+="\\"; VRB!u420  
 UpdateData(FALSE); %R^*MUTx  
} 4o|<zn  
CB^.N>'  
void CCaptureDlg::SaveBmp()  P0 9f  
{ nArG I}@  
 CDC dc;  7 T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); u{&#Gci  
 CBitmap bm; y.$Ae1a=  
 int Width=GetSystemMetrics(SM_CXSCREEN); "\+.S]~  
 int Height=GetSystemMetrics(SM_CYSCREEN); $.x,[R aN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); TPVB{ 107  
 CDC tdc; xF6byTi  
 tdc.CreateCompatibleDC(&dc); L+8{%\UPd  
 CBitmap*pOld=tdc.SelectObject(&bm); CE@[Z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _tRRIW"Vx"  
 tdc.SelectObject(pOld); cH6++r  
 BITMAP btm; MML=J~1  
 bm.GetBitmap(&btm); /2'l=R5#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "7Z-ACyF5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tb4^+&.GS  
 BITMAPINFOHEADER bih; x~Dj2 F]  
 bih.biBitCount=btm.bmBitsPixel; (H8JV1J  
 bih.biClrImportant=0; @'<=E AXe  
 bih.biClrUsed=0; H?rCIS0  
 bih.biCompression=0; h[mJ=LIrg  
 bih.biHeight=btm.bmHeight; V8Ri2&|3  
 bih.biPlanes=1; qw 03]a  
 bih.biSize=sizeof(BITMAPINFOHEADER); Sm{> 8e}UE  
 bih.biSizeImage=size; ( k,?)  
 bih.biWidth=btm.bmWidth; z'7XGO'Lo  
 bih.biXPelsPerMeter=0; hd]ts.  
 bih.biYPelsPerMeter=0; 3W%j^nM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^HxIy;EQ<z  
 static int filecount=0; bObsj]  
 CString name; 7Ie=(x8):  
 name.Format("pict%04d.bmp",filecount++); ac\([F-  
 name=m_Path+name; R a"hdxH  
 BITMAPFILEHEADER bfh; #;f50j!r  
 bfh.bfReserved1=bfh.bfReserved2=0; OJd/#KFm  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ujzfy  
 bfh.bfSize=54+size; 3I(;c ,S  
 bfh.bfOffBits=54; RD46@Q`  
 CFile bf; AVm+ 1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,ga6   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]x{.qTtw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XMiu}w!  
  bf.WriteHuge(lpData,size); Vn_~ |-Wt  
  bf.Close(); ]jYFrOMy4S  
  nCount++; J!2j]?D/e  
 } TDUY&1[  
 GlobalFreePtr(lpData); Io|D u  
 if(nCount==1) U`lK'..  
  m_Number.Format("%d picture captured.",nCount); r fzNw  
 else 0{g*\W*+~  
  m_Number.Format("%d pictures captured.",nCount); '&'m# H*:  
  UpdateData(FALSE); </WeB3#6  
} t&:L?K)j  
u*TC8!n  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) l?=\9y  
{ '3Lu_]I-  
 if(pMsg -> message == WM_KEYDOWN) ! 5NuFLOf  
 { s2#Ia>5!  
  if(pMsg -> wParam == VK_ESCAPE) u '7h(1@  
   return TRUE; 6,a H[ >W  
  if(pMsg -> wParam == VK_RETURN) xH xTL>,?  
   return TRUE; ]S%(l,  
 } PO`p.("h  
 return CDialog::PreTranslateMessage(pMsg); 3f] ;y<Km  
} b7Jxv7$e  
&CQO+Yr$l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d<6F'F^w.7  
{ EU%,tp   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nUOi~cs  
  SaveBmp(); H*'1bLzq  
  return FALSE; u3C_Xz  
} ,^1zG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0RT8N=B83  
 CMenu pop; =/!lK&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); MLu!8dgI  
 CMenu*pMenu=pop.GetSubMenu(0); [b:&y(  
 pMenu->SetDefaultItem(ID_EXITICON); e@Lxduq  
 CPoint pt; 6 Rl[M+Q  
 GetCursorPos(&pt); TI4Hu,rc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Lwr's'ao.  
 if(id==ID_EXITICON) D\AVZ76F1  
  DeleteIcon(); UqOBr2 UmG  
 else if(id==ID_EXIT) 3m1(l?fp  
  OnCancel(); QQM:[1;RT  
 return FALSE; FH+X<  
}  Y~WdN<g  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jYHnJ}<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QB*,+u4  
 AddIcon(); 6ZqU:^3  
 return res; tk&AZb,sP  
} X+4Uh I  
gP% <<yl  
void CCaptureDlg::AddIcon() LT%~C uf  
{ 8<VDp Y  
 NOTIFYICONDATA data; D!`[fjs6A  
 data.cbSize=sizeof(NOTIFYICONDATA); LJeq{Z  
 CString tip; J67 thTGFq  
 tip.LoadString(IDS_ICONTIP); 2*cNd}qr  
 data.hIcon=GetIcon(0); K)'[^V Xh  
 data.hWnd=GetSafeHwnd(); L4po1  
 strcpy(data.szTip,tip); ~VsN\!G  
 data.uCallbackMessage=IDM_SHELL; D?KLV _Op  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &lzY"Y*hA0  
 data.uID=98; (Y~/9a4X  
 Shell_NotifyIcon(NIM_ADD,&data); mS%4  
 ShowWindow(SW_HIDE); LQF;T7VKS)  
 bTray=TRUE; ie1~QQ  
} |j+JLB  
ui?@:=  
void CCaptureDlg::DeleteIcon() {MtJP:8Jp  
{ 0*MUe1{  
 NOTIFYICONDATA data; =d;a1AO{&  
 data.cbSize=sizeof(NOTIFYICONDATA); iZ]^JPU}  
 data.hWnd=GetSafeHwnd(); "smU5 s,P  
 data.uID=98; Ox)<"8M  
 Shell_NotifyIcon(NIM_DELETE,&data); DcxT6[  
 ShowWindow(SW_SHOW); R(}<W$(TV  
 SetForegroundWindow(); ^C K!=oO  
 ShowWindow(SW_SHOWNORMAL); ZKI8x1>Iq  
 bTray=FALSE; >FeCa h Fn  
} l(1.Ll  
OTYkJEC8\N  
void CCaptureDlg::OnChange() )7NK+k  
{ M[985bl  
 RegisterHotkey(); WReHep  
} _gH$ ,.j/  
|Fx *,91  
BOOL CCaptureDlg::RegisterHotkey() W2`3PEa  
{ 9y[U\[H  
 UpdateData(); SDbkPx  
 UCHAR mask=0;  zv"NbN  
 UCHAR key=0; IT#Li  
 if(m_bControl) vMY!Z1.*  
  mask|=4; M:.+^.h  
 if(m_bAlt) O,7S1  
  mask|=2; P@bPdw!JA  
 if(m_bShift) y<HNAG j  
  mask|=1; w3VgGc~  
  key=Key_Table[m_Key.GetCurSel()]; nWc@ufY  
 if(bRegistered){ Xn~\Vb  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *" OlO}o  
  bRegistered=FALSE; K8&) kfyI  
 } fVZ9 2Xw B  
 cMask=mask; : &nF>  
 cKey=key; Ttl m&d+C  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |aU8WRq  
 return bRegistered; <H#0pFB  
} p,f$9t4  
g9;s3qXiG  
  四、小结 = [: E  
FjizPg/|!  
  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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