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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: OkQ< Sc   
  vB7]L9=@"  
  一、实现方法 Se??E+aX  
&:d`Pik6  
  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: |LIcq0Z  
eY Rd#w  
#pragma data_seg("shareddata") 1h(n}u  
HHOOK hHook =NULL; //钩子句柄 ?a+J4Zr3  
UINT nHookCount =0; //挂接的程序数目 D {E,XOi  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 uAYDX<Ja9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 O:V.;q2]U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BpFX e7  
static int KeyCount =0; l66 QgPA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 y1Br4K5C  
#pragma data_seg() ?aaYka]  
sn[<Lq  
  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。 U>b.MIBX  
(8S+-k?  
  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: P5XUzLV L  
:`yW^b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %> YRNW@%  
cKey,UCHAR cMask) %MtaWZ  
{ ]*DIn1C^  
 BOOL bAdded=FALSE; A{{rNbCK  
 for(int index=0;index<MAX_KEY;index++){ B_c-@kl   
  if(hCallWnd[index]==0){ =v! 8i  
   hCallWnd[index]=hWnd; ODCN~7-@  
   HotKey[index]=cKey; hsws7sH  
   HotKeyMask[index]=cMask; vKbGG   
   bAdded=TRUE; 5?#AS#TD'  
   KeyCount++; t]t(/x#  
   break; U z)G Y  
  } BW`Tw^j  
 } 's8LrO(=  
 return bAdded; '}Jq(ah(  
} 0a$hK9BH  
//删除热键 yW(A0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pR:cnkVF  
{ _A$V~Hp9q  
 BOOL bRemoved=FALSE; gepYV}  
 for(int index=0;index<MAX_KEY;index++){ :n}t7+(>U  
  if(hCallWnd[index]==hWnd){ \$8p8MP<&D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (aq^\#9btO  
    hCallWnd[index]=NULL; a^L'-(  
    HotKey[index]=0; scEE$:  
    HotKeyMask[index]=0; !E/%Hv1  
    bRemoved=TRUE; bu\D*-  
    KeyCount--; Z+;670Z  
    break; `t #I e *  
   } O;;vz+ j  
  } aj]%c_])(  
 } `ucr;P  
 return bRemoved; \xtmd[7lb<  
} rI1;>/Ir  
%lK]m`(  
p~u11rH  
  DLL中的钩子函数如下: h,Tsb:Q"M  
gl6*bB=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X?]1/6rV  
{ r`=!4vY2  
 BOOL bProcessed=FALSE; ]?2&d[  
 if(HC_ACTION==nCode) cM+s)4TPL  
 { kKSn^q L*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )x&}{k6 %  
   switch(wParam) .SSj=q4?  
   {  uw&'=G6v  
    case VK_MENU: @GR|co  
     MaskBits&=~ALTBIT; I'RhA\`  
     break; -RnQ8Iu o  
    case VK_CONTROL: -Z%B9ql'  
     MaskBits&=~CTRLBIT; a?9Ka!O4s  
     break; {-Y% wM8<i  
    case VK_SHIFT: 1=%\4\  
     MaskBits&=~SHIFTBIT; f qU*y 6]  
     break; <P1sK/IZb  
    default: //judge the key and send message |Gh~Zu p  
     break; Cy##+u,C  
   } $q;dsW,8  
   for(int index=0;index<MAX_KEY;index++){ +3D3[.n  
    if(hCallWnd[index]==NULL) cO !2|v8i  
     continue; B?J #NFUb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :Yqi5CR  
    { sjV>&eb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vL7 JzSU_  
     bProcessed=TRUE; J Covk1  
    } [SJ*ks,]  
   } L?e N(L  
  } ']ussFaQ  
  else if((lParam&0xc000ffff)==1){ //有键按下 \?e{/hXnl  
   switch(wParam) H:BWv08~5  
   { 7Z/KXc[b  
    case VK_MENU: hqVFb.6[  
     MaskBits|=ALTBIT; {1V~`1(w  
     break; s`G3SE  
    case VK_CONTROL: ,9W|$2=F  
     MaskBits|=CTRLBIT; bm_'giQ:  
     break; -&* 4~  
    case VK_SHIFT: @m[r0i0J"  
     MaskBits|=SHIFTBIT; q}#4bB9  
     break; N%\!eHxy  
    default: //judge the key and send message 2\M^ _x$N  
     break; {WJ+6!v  
   } c _li.]P  
   for(int index=0;index<MAX_KEY;index++){ \ueo^p]_?  
    if(hCallWnd[index]==NULL) Q9 b.]W  
     continue; j ,' $i[F'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z!P7mH\c}  
    { c1?_L(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _Jc[`2Uv_c  
     bProcessed=TRUE; Re{vO&.  
    } {]/}3t  
   } R(sPU>`MX  
  } ?6F\cl0.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _>8ZL)NQQ  
   for(int index=0;index<MAX_KEY;index++){ W4Ey]y"  
    if(hCallWnd[index]==NULL) ew# t4~hh  
     continue; WCc,RI0   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %># VhK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1o. O]>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oZkjg3  
   } 6.| {l8%r  
  } :O}=$[  
 } i"~J -{d}  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  ]CD  
} xn'&TQo0  
_h2axXFhT  
  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: WKib$(%f6  
B\,pbOE?#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9@LL_r`?<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zU;%s<(p  
gwj+~vSfi  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: o.ntzN  
P".CZyI-i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TzT(aWP"  
{ v"VpE`z1#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5J^S-K^r  
 { 82.::J'e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Wp" +\{@)  
  SaveBmp(); Z6eM~$Y  
  return FALSE; "&s9;_9  
 } ]3xb Q1  
 …… //其它处理及默认处理 (*>%^C?  
} a7+w)]r  
G=R`O1-3  
!=7 (3< ?  
  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。 '% .:97  
~)X yrKw  
  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。 slC 38  
tONX<rA|]  
  二、编程步骤 /gWaxR*m  
6;WfsG5  
  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"; {Jf["Z  
OT[&a6_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 04`2MNfxG  
\':'8:E  
  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; !7C[\No(  
R_IUuz$e  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ,@mr})s  
c]SXcA;Pmv  
  5、 添加代码,编译运行程序。 z>rl7&[@  
9K]Li\  
三、程序代码 *E*= ;BG  
&\8qN_`  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _Mi`]VSq9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x3j)'`=15  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ J:<mq5[  
#if _MSC_VER > 1000 .E H&GX  
#pragma once ws1io.  
#endif // _MSC_VER > 1000 !6Sr*a*5  
#ifndef __AFXWIN_H__ ;L1Q"Hxh  
#error include 'stdafx.h' before including this file for PCH |$*1!pL-QP  
#endif d??;r:  
#include "resource.h" // main symbols dwd5P7  
class CHookApp : public CWinApp #|<\q*<  
{ ME.l{?v  
 public: h$p]M^Z7  
  CHookApp(); ,E8:!r)6  
  // Overrides T?vM\o%i3  
  // ClassWizard generated virtual function overrides us j:I`>  
  //{{AFX_VIRTUAL(CHookApp) >Q5et1c  
 public: -|0nZ  
  virtual BOOL InitInstance(); B bU%p  
  virtual int ExitInstance(); aQjs5RbP~  
  //}}AFX_VIRTUAL 05o)Q &`  
  //{{AFX_MSG(CHookApp) 6_Ps*Ed  
  // NOTE - the ClassWizard will add and remove member functions here. GM_~2Er]  
  // DO NOT EDIT what you see in these blocks of generated code ! &8p]yo2zO  
  //}}AFX_MSG _yH{LUIj  
  DECLARE_MESSAGE_MAP() =E6ND8l@2  
}; +,7nsWV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yx0wR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O;zq(/,-l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I5#KLZVg  
BOOL InitHotkey(); .|\}] O`  
BOOL UnInit(); cQg:yoF  
#endif 'q3<R%^Q   
_C`&(?}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. RT+pB{Y  
#include "stdafx.h" WP5cC@x  
#include "hook.h" W|X=R?*ZK  
#include <windowsx.h> J,iS<lV_  
#ifdef _DEBUG Q]/ZVcoqo  
#define new DEBUG_NEW /b&ka&|t  
#undef THIS_FILE #mT\B[4h  
static char THIS_FILE[] = __FILE__; l k~VvRq  
#endif &>nB@SQZ  
#define MAX_KEY 100 s2Z'_r T  
#define CTRLBIT 0x04 C{{RU7iqc&  
#define ALTBIT 0x02 4S%s=v w  
#define SHIFTBIT 0x01 #VM+.75o1  
#pragma data_seg("shareddata") %mqep5n(  
HHOOK hHook =NULL; ]>v C.iYp  
UINT nHookCount =0; wh Hp}r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %#go9H(K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p{@jM  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FIMM\W  
static int KeyCount =0; 5#275Hyv  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift W;Y"J_  
#pragma data_seg() rY?]pMp  
HINSTANCE hins; v2Ft=_*G|  
void VerifyWindow(); k|hy_? *  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) o#Gf7.E8  
//{{AFX_MSG_MAP(CHookApp) 6Qc *:(GE  
// NOTE - the ClassWizard will add and remove mapping macros here. ! 3 ;;6  
// DO NOT EDIT what you see in these blocks of generated code! Vs1H)T%  
//}}AFX_MSG_MAP :)9CG!2y<M  
END_MESSAGE_MAP() Ew< sK9[o  
_cc3 7[  
CHookApp::CHookApp() 8'>yB  
{ hkpS}*L9o  
 // TODO: add construction code here, 8}M-b6R V  
 // Place all significant initialization in InitInstance MnL o{G]  
} fA$2jbGW  
ltWEA  
CHookApp theApp; 3<XP/c";  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b6%[?k  
{ $.Ia;YBf  
 BOOL bProcessed=FALSE; R|m!*B~  
 if(HC_ACTION==nCode) (G6lr%d  
 { V7 OhOLK8  
  if((lParam&0xc0000000)==0xc0000000){// Key up \sn wR  
   switch(wParam) O#_\@f#[  
   {  l;;,[xhq  
    case VK_MENU: UuKW`(?^  
     MaskBits&=~ALTBIT; /4I9Elr  
     break; 1La?x'{2MP  
    case VK_CONTROL: xcQD]"   
     MaskBits&=~CTRLBIT; *Uw"`l  
     break; `uwSxt  
    case VK_SHIFT: =L\&} kzB  
     MaskBits&=~SHIFTBIT; Kj7 ?_o{  
     break; +B '<0  
    default: //judge the key and send message /$\N_`bM  
     break; P7 h^!a/  
   } 6:Hd`  
   for(int index=0;index<MAX_KEY;index++){ H'"=C&D~  
    if(hCallWnd[index]==NULL) `_iK`^(-  
     continue; " k0gZb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y=?Tm,z4  
    { ]\1H=g%Ou  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lNLa:j  
     bProcessed=TRUE; og?L 9  
    } *b4W+E  
   } IKrojK8-?  
  } Y1wH_!%b  
  else if((lParam&0xc000ffff)==1){ //Key down %ONU0xtqk  
   switch(wParam) J4]tT pu"K  
   { s?JOGu  
    case VK_MENU: L9]y~[R:  
     MaskBits|=ALTBIT; -5b#w"^w^  
     break; 1f+z[ad&^  
    case VK_CONTROL: no$X0ia  
     MaskBits|=CTRLBIT; {zI>"%$u  
     break;  \4j(el  
    case VK_SHIFT: D!DL6l`  
     MaskBits|=SHIFTBIT; P(b ds  
     break; 84_Y+_9  
    default: //judge the key and send message *kt|CXxAS8  
     break; ;uho.)%N`F  
   } wii.0~p  
   for(int index=0;index<MAX_KEY;index++) YJ !jdE}  
   { F Jp<J  
    if(hCallWnd[index]==NULL) 7\AoMk}  
     continue; m;J'y2h =$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yRivf.wH  
    { ok1w4#%,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _ G$21=  
     bProcessed=TRUE; 0}` 0!Kv  
    } WR9-HPF  
   } }vb.>hy  
  } P\y ZcL  
  if(!bProcessed){ 0Of6$`  
   for(int index=0;index<MAX_KEY;index++){ C';Dc4j  
    if(hCallWnd[index]==NULL) 2c'<rkA  
     continue; 65vsQ|Zw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7*kTu0m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7sU+:a  
   } N(kSE^skOa  
  } ?X+PNw|pf  
 } C1uV7t*\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {wl7&25  
} -bgj<4R$p  
G '%ZPh89  
BOOL InitHotkey() y5j ;Daq  
{ ~J0r%P  
 if(hHook!=NULL){ t~|`RMn"  
  nHookCount++; @d n& M9Z  
  return TRUE; BS2'BS8  
 } 6"9(ce KX  
 else gSHN,8. `  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,:{+-v(  
  if(hHook!=NULL) ' ,1[rWyc  
   nHookCount++; _4 YT2k  
  return (hHook!=NULL); Qoa&]]  
} uvRX{q 4  
BOOL UnInit() ck$>   
{ q>6RO2,  
 if(nHookCount>1){ GF36G?iEi  
  nHookCount--; 5,BvT>zFY  
  return TRUE; y[/:?O}g4  
 } <OrQbrWQa  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h %5keiA  
 if(unhooked==TRUE){ 5S ) N&%  
  nHookCount=0; zCS&w ~  
  hHook=NULL; Rw<O%i5/d  
 } .7+"KP:  
 return unhooked; '(zP;  
} 09=w  
 O[$XgPM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [M#(su0fv  
{ )=!|^M  
 BOOL bAdded=FALSE; g)}q3-<AK>  
 for(int index=0;index<MAX_KEY;index++){ hGI5^!Cq  
  if(hCallWnd[index]==0){ k_nQmU>  
   hCallWnd[index]=hWnd; 7e[&hea  
   HotKey[index]=cKey; RJ-J/NhWyI  
   HotKeyMask[index]=cMask; jw)c|%r>  
   bAdded=TRUE; psuK\ s  
   KeyCount++; ky'G/ z  
   break; BO+t o.  
  } S rhBU6K  
 } TCK#bJ  
 return bAdded; {]iM5?  
}  zj$Ve  
I/zI\PP,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #@ F   
{ RLO<5L  
 BOOL bRemoved=FALSE; @cQ |`  
 for(int index=0;index<MAX_KEY;index++){ BnG{) \s  
  if(hCallWnd[index]==hWnd){ d>0 j!+s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HP=5 a.  
    hCallWnd[index]=NULL; YXg^t$  
    HotKey[index]=0; !{!(yP_  
    HotKeyMask[index]=0; U^Iq]L  
    bRemoved=TRUE; Y2|c;1~5$  
    KeyCount--; sfp.>bMj  
    break; 9Qq%Fw_  
   } z3M6<.K  
  } "2:#bXM-  
 } q8& ^E.K  
 return bRemoved; E?jb?  
} M (:_(4~  
AgWG4C=  
void VerifyWindow() t'DIKug&  
{ }:\e "Bfv  
 for(int i=0;i<MAX_KEY;i++){ WV;[vg]  
  if(hCallWnd!=NULL){ =%{E^z>1  
   if(!IsWindow(hCallWnd)){ XUK%O8N#9  
    hCallWnd=NULL; b~?3HY:t~K  
    HotKey=0; w ; PV &M  
    HotKeyMask=0; A QPzId*z  
    KeyCount--; 6-\C?w A  
   } N::.o+1  
  } 'EB5#  
 } b{,vZhP-  
} j?(@x>HA  
.p'\@@o5  
BOOL CHookApp::InitInstance() #B__-"cRv  
{ 7 .xejz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7??j}ob>  
 hins=AfxGetInstanceHandle(); ( `d_DQ  
 InitHotkey(); ah!fQLMH  
 return CWinApp::InitInstance(); /4 .]L~  
} 9$^v*!<z\  
KA."[dVa  
int CHookApp::ExitInstance() +}C M2>M  
{ G 'CYvV  
 VerifyWindow(); %sS7o3RW\  
 UnInit(); zU# OjvNk  
 return CWinApp::ExitInstance(); KvEZbf 3f  
} Ifj%"RI  
!< ^`Sx/+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |RI77b:pX  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &.:yP3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;{rl Y>  
#if _MSC_VER > 1000 &_Z8:5e  
#pragma once =@k 3*#\  
#endif // _MSC_VER > 1000 6K5KkEp  
`(L<Q%  
class CCaptureDlg : public CDialog e(k$k>?  
{ WhL 1OG  
 // Construction a;0$fRy  
 public: 9R|B 5.  
  BOOL bTray; .DcuJC=  
  BOOL bRegistered; NAfu$7  
  BOOL RegisterHotkey(); 0>0:ls  
  UCHAR cKey; `pXC= []B2  
  UCHAR cMask; BYs^?IfW  
  void DeleteIcon(); !B&1{  
  void AddIcon(); R(HW0@R@w  
  UINT nCount; po+ 1  
  void SaveBmp(); wqp(E+&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yGPi9j{QXq  
  // Dialog Data +,}CuF  
  //{{AFX_DATA(CCaptureDlg) >V3pYRA   
  enum { IDD = IDD_CAPTURE_DIALOG }; 4Jj O.H  
  CComboBox m_Key; qzu%Pp6If  
  BOOL m_bControl; 'p(I!]"uo  
  BOOL m_bAlt; }UHoa  
  BOOL m_bShift;   S?m4  
  CString m_Path; 9rQpKq:# E  
  CString m_Number; Q"H1(kG|  
  //}}AFX_DATA |p+ xM  
  // ClassWizard generated virtual function overrides W$Zc;KRz$0  
  //{{AFX_VIRTUAL(CCaptureDlg) LL=nMoS  
 public: Jx= v6==7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); h2edA#bub  
 protected: o8S)8_3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UjQi9ELoJ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f5QJj<@  
  //}}AFX_VIRTUAL # FV`*G  
  // Implementation %GDs/9  
 protected: Gnmxp%&}P|  
  HICON m_hIcon; Yim`3>#t  
  // Generated message map functions eVy\)dCsU  
  //{{AFX_MSG(CCaptureDlg) ]#oqum@Yf1  
  virtual BOOL OnInitDialog(); (#k2S-5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^7% KS  
  afx_msg void OnPaint(); B\Y !5$  
  afx_msg HCURSOR OnQueryDragIcon(); gw9:1S  
  virtual void OnCancel(); a0x/? )DO  
  afx_msg void OnAbout(); 6995r%  
  afx_msg void OnBrowse(); Fu !sw]6xx  
  afx_msg void OnChange(); oGi{d5  
 //}}AFX_MSG 3:WXrOl  
 DECLARE_MESSAGE_MAP() qbe9 CF'@_  
}; c6)q(zz  
#endif sp$W=Wu7  
GPnSdGLC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FzGla})  
#include "stdafx.h" nLjo3yvV..  
#include "Capture.h" h|Uy!?l  
#include "CaptureDlg.h" K-*q3oh G  
#include <windowsx.h> [-Dl,P=  
#pragma comment(lib,"hook.lib") t Sf`  
#ifdef _DEBUG /h'b,iYVV  
#define new DEBUG_NEW 4d0<uB&v'  
#undef THIS_FILE VR9C< tMSi  
static char THIS_FILE[] = __FILE__; ua vv  
#endif }nJG<rY  
#define IDM_SHELL WM_USER+1 qjp<_aw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); onj:+zl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P9D'L{yS/x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  ,M&[c|  
class CAboutDlg : public CDialog tJ9i{TS  
{ _*Z2</5  
 public: jVpk) ;vC  
  CAboutDlg(); 3_tO  
  // Dialog Data Kr]`.@/.S  
  //{{AFX_DATA(CAboutDlg) ]gQ4qu5  
  enum { IDD = IDD_ABOUTBOX }; 5:H9B  
  //}}AFX_DATA *xOrt)D=  
  // ClassWizard generated virtual function overrides GlVD!0  
  //{{AFX_VIRTUAL(CAboutDlg) -*EK-j  
 protected: KwiTnP!Dca  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KD7 RI3'?  
  //}}AFX_VIRTUAL cTeEND)  
  // Implementation It@ak6u?  
 protected: O2Mo ~}  
  //{{AFX_MSG(CAboutDlg) bu#}`/\_  
  //}}AFX_MSG ( U |[C*  
  DECLARE_MESSAGE_MAP() ]l'W=_XDg  
}; 'L2M  W  
$Y4;Xe=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /IC7q?avQN  
{ &` u<KKF6  
 //{{AFX_DATA_INIT(CAboutDlg) ` `A=p<W  
 //}}AFX_DATA_INIT FPu"/4v&  
} aMFUJrXo  
_azg 0.)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) wK CHG/W  
{ rnVh ]xJ  
 CDialog::DoDataExchange(pDX); ?1('s0s\,  
 //{{AFX_DATA_MAP(CAboutDlg) T }X#I'Z  
 //}}AFX_DATA_MAP :sBg+MS  
} 4l$(#NB<  
:hG?} [-2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {7)D/WY5  
 //{{AFX_MSG_MAP(CAboutDlg) u5 EHzoq  
 // No message handlers h&Ehp   
 //}}AFX_MSG_MAP e1X*}OI  
END_MESSAGE_MAP() z1ltc{~Z  
g@.RfX=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _1`*&k JL~  
: CDialog(CCaptureDlg::IDD, pParent) Z2WAVSw  
{ _{o=I?+]  
 //{{AFX_DATA_INIT(CCaptureDlg) N(@'L43$V  
  m_bControl = FALSE; Dm6}$v'0  
  m_bAlt = FALSE; tqE LF  
  m_bShift = FALSE; Dqe/n_Z  
  m_Path = _T("c:\\"); W$0<a@  
  m_Number = _T("0 picture captured."); fi%u]  
  nCount=0; 6v0^'}  
  bRegistered=FALSE; OZ1+`4 v  
  bTray=FALSE; O edL?4  
 //}}AFX_DATA_INIT tH<v1LEZN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s,Cm}4L6  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); SQ)$>3>C  
} l'(Cxhf.W  
{b>tX)Tep  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Te~"\`omJ3  
{ a $g4 )0eS  
 CDialog::DoDataExchange(pDX); d(w $! $"h  
 //{{AFX_DATA_MAP(CCaptureDlg) u7&r'rZ1_!  
  DDX_Control(pDX, IDC_KEY, m_Key); U6 "U^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); c@:r\]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); LF0gy3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sD.bBz  
  DDX_Text(pDX, IDC_PATH, m_Path); I-i)D  
  DDX_Text(pDX, IDC_NUMBER, m_Number); })Rmu."\  
 //}}AFX_DATA_MAP Roy0?6O  
} @YP\!#"8  
f8)D|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b1jh2pG(V  
//{{AFX_MSG_MAP(CCaptureDlg) 0i9y-32-  
 ON_WM_SYSCOMMAND() jN V2o  
 ON_WM_PAINT() 'z2}qJJ)  
 ON_WM_QUERYDRAGICON() UnZ*"%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }.7!@!q.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0%}$@H5i  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PEoO s  
//}}AFX_MSG_MAP !J[3U   
END_MESSAGE_MAP() cU5x8[2  
~ @Ib:M  
BOOL CCaptureDlg::OnInitDialog() Bm%:Qc*  
{ xmTa$tR+  
 CDialog::OnInitDialog(); N<:5 r  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *J?QXsg  
 ASSERT(IDM_ABOUTBOX < 0xF000); mUzNrkG(G  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7[QU *1bk  
 if (pSysMenu != NULL) __$IbF5  
 { B N@*CG  
  CString strAboutMenu; dh%C@n:B  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \i "I1xU  
  if (!strAboutMenu.IsEmpty()) R5G~A{w0  
  { Y*3qH]  
   pSysMenu->AppendMenu(MF_SEPARATOR); bmc1S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &Hc8u,|  
  } GdR>S('  
 } ";9cYoKRY  
 SetIcon(m_hIcon, TRUE); // Set big icon {J%hTjCw  
 SetIcon(m_hIcon, FALSE); // Set small icon /Yc!m$uCW  
 m_Key.SetCurSel(0); yEtSyb~GK  
 RegisterHotkey(); J& +s  
 CMenu* pMenu=GetSystemMenu(FALSE); kYz)h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )dG7 $,g  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X^?<, Y)1.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R* E/E  
 return TRUE; // return TRUE unless you set the focus to a control H]Q Z4(  
} 9IMtqL&  
6J6MR<5'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {LY$  
{ :HRJ49a  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) zrE ~%YR  
 { on(F8%]zE  
  CAboutDlg dlgAbout; z}s0D]$+x  
  dlgAbout.DoModal(); 95aa  
 } 2;5EH 0  
 else !k||-Q &  
 { 6t TLyI$+  
  CDialog::OnSysCommand(nID, lParam); r`i<XGPJ%  
 } -Duy: C6W  
} 7s,IT8ii  
p(%7|'  
void CCaptureDlg::OnPaint() Dz]&|5'N  
{ 1a| q&L`o  
 if (IsIconic()) [sTr#9Z  
 { #,qw~l]  
  CPaintDC dc(this); // device context for painting U{RW=sYB~9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S,lJ&Rsu  
  // Center icon in client rectangle 85m[^WGyh  
  int cxIcon = GetSystemMetrics(SM_CXICON); v@LK3S/!3  
  int cyIcon = GetSystemMetrics(SM_CYICON); >yg mE`g  
  CRect rect; 9cWl/7;zXO  
  GetClientRect(&rect); `z-4OJ8~  
  int x = (rect.Width() - cxIcon + 1) / 2; ]/HSlT=  
  int y = (rect.Height() - cyIcon + 1) / 2; 2K!3+D"  
  // Draw the icon #SQT!4  
  dc.DrawIcon(x, y, m_hIcon); 4s^5t6  
 }  ^P~%^?(  
 else U'UV=:/-  
 { @YMef `T:  
  CDialog::OnPaint(); G7pj.rQ  
 } PNd]Xmv)  
} O!lZ%j@%  
<O?iJ=$  
HCURSOR CCaptureDlg::OnQueryDragIcon() ZBcZG  
{ 26yv w  
 return (HCURSOR) m_hIcon; @ _U]U  
} MJV)| 2C  
e4yd n  
void CCaptureDlg::OnCancel() .rD@Q{e50  
{ jB:$+k|~.  
 if(bTray) *.r i8  
  DeleteIcon(); X7?p$!M6;B  
  CDialog::OnCancel(); :qc@S&v@]  
} U GQ{QH  
{%9)l,  
void CCaptureDlg::OnAbout() vmvk  
{ m7zen530  
 CAboutDlg dlg; he wX)  
 dlg.DoModal(); b>hNkVI  
} Z2(z,pK  
+b.<bb6  
void CCaptureDlg::OnBrowse() (LA%q6  
{ m(s(2wq"f  
 CString str; G`8gI)$u  
 BROWSEINFO bi; iP~5=  
 char name[MAX_PATH]; 8t!(!<iF0  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #gMMh B=  
 bi.hwndOwner=GetSafeHwnd(); #Bg88!-4  
 bi.pszDisplayName=name; %UI.E=`n  
 bi.lpszTitle="Select folder"; Lz2wOB1Zc+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *j?tcxq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;RflzY|D  
 if(idl==NULL) }BKEz[G(  
  return; 2S&e!d-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); m beM/  
 str.ReleaseBuffer(); 4{(uw  
 m_Path=str; =zDU!< U  
 if(str.GetAt(str.GetLength()-1)!='\\') @ JZ I  
  m_Path+="\\"; ?FVX &{{V  
 UpdateData(FALSE); Al09R,I;  
} C$vKRg\o  
A`T VV  
void CCaptureDlg::SaveBmp() {2vk<  
{ lTv I;zy  
 CDC dc; 6b~Zv$5^Y-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]{{A/ j\  
 CBitmap bm; N#Y%+1  
 int Width=GetSystemMetrics(SM_CXSCREEN); h=.|!u  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3xxQL,FV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); pzbR.L}'D  
 CDC tdc; 8V>j-C  
 tdc.CreateCompatibleDC(&dc); (8TB*BhQ_  
 CBitmap*pOld=tdc.SelectObject(&bm); 53J!iNnXT6  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); AV Gu*  
 tdc.SelectObject(pOld); Yc3\NqQM  
 BITMAP btm; O%H_._#N`  
 bm.GetBitmap(&btm); l9lBhltOH  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; MIo<sJuv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k*(c8/<.d  
 BITMAPINFOHEADER bih; u pg?  
 bih.biBitCount=btm.bmBitsPixel; gS_)(  
 bih.biClrImportant=0; vp? 87h  
 bih.biClrUsed=0; t 9&xk?%{  
 bih.biCompression=0; '3 w=D )  
 bih.biHeight=btm.bmHeight; "^F#oo%L  
 bih.biPlanes=1; NeAkJG=<  
 bih.biSize=sizeof(BITMAPINFOHEADER); svCD&~|K#  
 bih.biSizeImage=size; Y (x_bJ  
 bih.biWidth=btm.bmWidth; Rq )&v*=  
 bih.biXPelsPerMeter=0; -=iGl5P?  
 bih.biYPelsPerMeter=0; y  >r7(qg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /vll*}}  
 static int filecount=0; {a\O7$A\F  
 CString name; 5ppOG_  
 name.Format("pict%04d.bmp",filecount++); 'MRvH lCM  
 name=m_Path+name; (9% ki$=}+  
 BITMAPFILEHEADER bfh; bXF>{%(}E  
 bfh.bfReserved1=bfh.bfReserved2=0; Oi AZA<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -$**/~0zU  
 bfh.bfSize=54+size; @X4Ur+d  
 bfh.bfOffBits=54; a yn6k=F  
 CFile bf; \ T/i]z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nDu f<mw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^E\{&kaUp  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Qz\yoI8JA,  
  bf.WriteHuge(lpData,size); 8] skAh  
  bf.Close(); [bk2RaX:i  
  nCount++; ^u&oS1U  
 } Tm(XM<  
 GlobalFreePtr(lpData); #no~g( !o  
 if(nCount==1) Zt4g G KG  
  m_Number.Format("%d picture captured.",nCount); 3I&=1o  
 else ?%% 'GX  
  m_Number.Format("%d pictures captured.",nCount); njeRzX  
  UpdateData(FALSE); )b`Xc+{>  
} >/mi#Y6  
D9,609w  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {*,~,iq  
{ "X0"=1R~  
 if(pMsg -> message == WM_KEYDOWN) Oo |*q+{  
 { ZUP\)[~  
  if(pMsg -> wParam == VK_ESCAPE) M #'br<]  
   return TRUE; x;)bp7  
  if(pMsg -> wParam == VK_RETURN) KY34Sc  
   return TRUE; ]E'BFon  
 } #N^TqOr  
 return CDialog::PreTranslateMessage(pMsg); \95qH ,w)T  
} =F'p#N0_2  
-1iKeyyA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hTcy;zLLS  
{ =+5z;3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ A]ZCQ49  
  SaveBmp(); QA>(}u\+  
  return FALSE; qzS 9ls>>  
} VN[C%C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 59mNb:<  
 CMenu pop; K~ ,| ~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZycV?ob8}  
 CMenu*pMenu=pop.GetSubMenu(0); s3qWTdM  
 pMenu->SetDefaultItem(ID_EXITICON); nfpkWyIu{  
 CPoint pt; JYuI~<:  
 GetCursorPos(&pt); E}AOtY5a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VeiJ1=hc  
 if(id==ID_EXITICON) JLUG=x(dA  
  DeleteIcon(); Py7!_TX  
 else if(id==ID_EXIT) t\~lGG-p  
  OnCancel(); i)9}+M 5  
 return FALSE; pYZ6-s  
} QR4rQu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &7z79#1NS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) U<,@u,_Ja  
 AddIcon(); 2 gz}]_  
 return res; kms&o=^  
} D^Ahw"X)  
 W%LTcm  
void CCaptureDlg::AddIcon() ?&;d#z*4  
{ KilgeN:  
 NOTIFYICONDATA data; CvfX m  
 data.cbSize=sizeof(NOTIFYICONDATA); zvjVM"=G  
 CString tip; X8~dFjhX  
 tip.LoadString(IDS_ICONTIP); *uHL'Pe;m  
 data.hIcon=GetIcon(0); uo0g51%9  
 data.hWnd=GetSafeHwnd(); ,: g.B\'Q  
 strcpy(data.szTip,tip); $$ %4,\{l  
 data.uCallbackMessage=IDM_SHELL; y_O[r1MF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5tPBTS<<"L  
 data.uID=98; K$OxeJP?F  
 Shell_NotifyIcon(NIM_ADD,&data); -c-af%xD  
 ShowWindow(SW_HIDE); .K`OEdr<  
 bTray=TRUE; wKF #8Y  
} .N2yn`  
HR)Dz~Obw  
void CCaptureDlg::DeleteIcon() 5\93-e  
{ VD}8ei  
 NOTIFYICONDATA data; jv $Y]nf  
 data.cbSize=sizeof(NOTIFYICONDATA); RtVy^~=G  
 data.hWnd=GetSafeHwnd(); r /v'h@  
 data.uID=98; <;O=h; ~|  
 Shell_NotifyIcon(NIM_DELETE,&data); L9tjH C]  
 ShowWindow(SW_SHOW); }OY]mAv-B  
 SetForegroundWindow(); H.-jBFt}  
 ShowWindow(SW_SHOWNORMAL); ~RcI+jR)  
 bTray=FALSE; 5/x"!Jk  
} Rs+rlJq  
d"3S[_U  
void CCaptureDlg::OnChange() tHNvb\MR$  
{ jVP70c  
 RegisterHotkey(); *hVbjI$  
} QZy+`  
we'<Y  
BOOL CCaptureDlg::RegisterHotkey() Z(Da?6#1  
{ +pYrAqmO-  
 UpdateData(); fw>@:m_bK  
 UCHAR mask=0; 5.gM]si  
 UCHAR key=0; (<sZ8n=AD  
 if(m_bControl) ,w~0U  
  mask|=4; rM<lPMr1*  
 if(m_bAlt) mk>L:+  
  mask|=2; -H1mKZDPP  
 if(m_bShift) 2p\CCzw  
  mask|=1; o`?0D)/O  
  key=Key_Table[m_Key.GetCurSel()]; 6OYXcPW'  
 if(bRegistered){ \s<7!NAE4  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); oI=7X*B9  
  bRegistered=FALSE; <S~_|Y*v  
 } IOA"O9;  
 cMask=mask; (IX iwu  
 cKey=key; [6x-c;H_4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0_yE74i  
 return bRegistered; F#=XJYG1  
} @|Z:7n6S  
:xw2\:5~0  
  四、小结 [?3*/*V  
34VyR a  
  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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