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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: } 17.~  
  {w <+_++  
  一、实现方法 J# kl 7  
RL[E X5U  
  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: .O0O-VD+a  
 2Cg$,#H  
#pragma data_seg("shareddata") @d&/?^dp6  
HHOOK hHook =NULL; //钩子句柄 :3$}^uzIq  
UINT nHookCount =0; //挂接的程序数目 z* <y5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |p00j|k   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 X#w%>al  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey p#KW$OQ]8  
static int KeyCount =0; ^JR;epVJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A%\tiZe  
#pragma data_seg() mNYl@+:psj  
0L^u2HZYL  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _#_ E^!  
O3o: qly!  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >ulY7~wUv  
jtm?z c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ]8;n{ }X  
cKey,UCHAR cMask) #;# 3%?  
{ ~}DQT>7$  
 BOOL bAdded=FALSE; >`jU`bR@  
 for(int index=0;index<MAX_KEY;index++){ z}Jr^>  
  if(hCallWnd[index]==0){ s4H2/EC  
   hCallWnd[index]=hWnd; 4ujvD^  
   HotKey[index]=cKey; t_ur&.^SB  
   HotKeyMask[index]=cMask; MP>n)!R[`  
   bAdded=TRUE; e &9F\e  
   KeyCount++; k8]O65t|  
   break; =i HiPvP0  
  } ug`NmIQP  
 } ;PyZ?Z;  
 return bAdded; 9F;S+)H4  
} q|)Q9+6$+  
//删除热键 Pgp {$ID  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V84*0&qOW  
{ Rb}KZ+o "Z  
 BOOL bRemoved=FALSE; <a le$[  
 for(int index=0;index<MAX_KEY;index++){ gBk5wk_j|  
  if(hCallWnd[index]==hWnd){ fMf&?`V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u2(eaP8d  
    hCallWnd[index]=NULL; as"N=\N  
    HotKey[index]=0; 4O{Avt7C  
    HotKeyMask[index]=0; nkeI60  
    bRemoved=TRUE; B ?%L  
    KeyCount--; UF__O.l__  
    break; qO`qJ/  
   } vs&8wbS)  
  } _U)%kY8  
 } i z]rFNR  
 return bRemoved; 9j|gdfb%ml  
} %zo= K}u  
1MA@JA:T  
G.U 5)4_^  
  DLL中的钩子函数如下: Rn+4DcR  
1QJBb \  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~=y3Gd B3  
{ !#?kWAU  
 BOOL bProcessed=FALSE; J0220 _  
 if(HC_ACTION==nCode) 8rbG*6  
 { ;Pb8YvG1$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 gd^Js 1Z  
   switch(wParam) {b!7 .Cd=  
   {  qS8B##x+=  
    case VK_MENU: w>~M}Ahj  
     MaskBits&=~ALTBIT; 8)0 L2KL'  
     break; l*7?Y7FK  
    case VK_CONTROL: +'03>!V  
     MaskBits&=~CTRLBIT; J7i+c];!<  
     break; g.Hio.fVd  
    case VK_SHIFT: :wgfW .w  
     MaskBits&=~SHIFTBIT; tjv\)Nn'  
     break; Q*O<@   
    default: //judge the key and send message v@u<Ww;=@  
     break; ~S(^T9R  
   } mgkyC5)d  
   for(int index=0;index<MAX_KEY;index++){ pvXcLR)L+3  
    if(hCallWnd[index]==NULL) NyPd5m:  
     continue; }C(5-7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3#.\  
    { G5'_a$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W."f 8ow  
     bProcessed=TRUE; fUcLfnr  
    } d34Y'r  
   } et$uP  
  } qSiWnN8D t  
  else if((lParam&0xc000ffff)==1){ //有键按下 H}b\`N[nr  
   switch(wParam) 9XV^z*E(J  
   { IjZ@U%g@;  
    case VK_MENU: >xd<YwXZ  
     MaskBits|=ALTBIT; t<b3K-  
     break; ?~2Bi^W5  
    case VK_CONTROL: xRX>|S  
     MaskBits|=CTRLBIT; >#N[GrJAE  
     break; h[=nx^  
    case VK_SHIFT: XizPMN5a  
     MaskBits|=SHIFTBIT; LD55n%|0`H  
     break; m4/}Jx[  
    default: //judge the key and send message p#H]\ P'  
     break; QB1M3b  
   } Q_}/ Pn$1  
   for(int index=0;index<MAX_KEY;index++){ m)f|:MM  
    if(hCallWnd[index]==NULL) ?y-s20Kd  
     continue; A 0#Y, 1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Jyu`-=It  
    { mtw9AoO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e.X@] PQJQ  
     bProcessed=TRUE; n,KA&)/s  
    } 3ps,uozj  
   } C{Blqf3V0  
  } D@vMAW  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \f"?Tv-C'  
   for(int index=0;index<MAX_KEY;index++){ N8+P  
    if(hCallWnd[index]==NULL) ,k*F`.[  
     continue; &=-PRza%j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o'qm82* =  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (fXq<GXAn/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 l \}25 e  
   } GNghB(  
  } /PC` 0/b  
 } #%cR%Z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F1}  
} 'TX M{RGw  
*]{=8zc2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: EUwQIA2c8N  
]P*!'iYN(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aIu2>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); my,x9UPs  
?'2 v.5TQt  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %CT!$Y'n  
QGPR.<D)B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !0dX@V'r  
{ K^ 6+Ily  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) v>at/ef  
 { .;slrg(5F  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ed=}PrE  
  SaveBmp(); OROqT~6G  
  return FALSE; ]<X2AO1  
 } WF)s*$'uz;  
 …… //其它处理及默认处理 r~[B _f!  
} K\X: G-C9  
Mdky^;qq3;  
gfVDqDF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 <|V'pim  
0 pNo`Bm  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 #HDesen  
!Mil?^  
  二、编程步骤 yjeL9:jH[  
q u:To7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; %Qd3BZ  
6!RikEAh  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -aN":?8(G  
irmwc'n]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 3k{c$x}  
._ih$=   
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; L?.7\a@  
_3U|2(E  
  5、 添加代码,编译运行程序。 wWFW,3b  
>p |yf. G  
三、程序代码 xSOoIsL[  
MHNe>C-!q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL t 2G1[j!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) CK Mv7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z^+a*^w~{  
#if _MSC_VER > 1000 U IQ 6SvM  
#pragma once K#;txzi  
#endif // _MSC_VER > 1000 CKN8z  
#ifndef __AFXWIN_H__ )rbc;{.  
#error include 'stdafx.h' before including this file for PCH r\bq[9dX>  
#endif 9,KVBO  
#include "resource.h" // main symbols O,]_ tp  
class CHookApp : public CWinApp :H3(w|T/  
{ kc|>Q7~{  
 public: (n}%a6M  
  CHookApp(); ?N2X)Y@yi  
  // Overrides /KP_Vc:g2_  
  // ClassWizard generated virtual function overrides H8<m9zDvl  
  //{{AFX_VIRTUAL(CHookApp) !?n50  
 public: 7BK46x  
  virtual BOOL InitInstance(); 776 nWw)  
  virtual int ExitInstance(); d v[\.T`LY  
  //}}AFX_VIRTUAL J 5- rp|  
  //{{AFX_MSG(CHookApp) 3z$HKG  
  // NOTE - the ClassWizard will add and remove member functions here. L77EbP`P  
  // DO NOT EDIT what you see in these blocks of generated code ! #Wq#beBb  
  //}}AFX_MSG X,&xhSzg?  
  DECLARE_MESSAGE_MAP() {\luieG  
}; VlV)$z_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); excrXx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :SQ LfOQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bCt_y R  
BOOL InitHotkey(); w0$R`MOR+  
BOOL UnInit(); W'd/dKU x  
#endif #B\B(y  
-P*xyI  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -D;lS 6  
#include "stdafx.h" jvWI_Fto  
#include "hook.h" 7Qt2gf  
#include <windowsx.h> &E`9>&~J  
#ifdef _DEBUG GP Ix@k  
#define new DEBUG_NEW tgK x4  
#undef THIS_FILE .oEFX8  
static char THIS_FILE[] = __FILE__; EuLXtq  
#endif +=Yk-nJ  
#define MAX_KEY 100 G tG&yeB  
#define CTRLBIT 0x04 :(+]b  
#define ALTBIT 0x02 C*$|#.l  
#define SHIFTBIT 0x01 s7vPI   
#pragma data_seg("shareddata") ]}/mFY?7  
HHOOK hHook =NULL; |o|gP8  
UINT nHookCount =0; z,M'Tr.1|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n~9 i^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nx D'r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey tb:    
static int KeyCount =0; _,t&C7Yf;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift M,ppCHy/$  
#pragma data_seg() ?C FS}v  
HINSTANCE hins; TJE% U0Ln  
void VerifyWindow(); I>d I[U  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Wf_CR(  
//{{AFX_MSG_MAP(CHookApp) |}%(6<  
// NOTE - the ClassWizard will add and remove mapping macros here. d RHlx QUn  
// DO NOT EDIT what you see in these blocks of generated code! S\}?zlV  
//}}AFX_MSG_MAP #i@ACAgn;6  
END_MESSAGE_MAP() pEY>A_F  
Q;=6ag'  
CHookApp::CHookApp() #`r(zI[  
{ )K8P+zn~  
 // TODO: add construction code here, dEL3?-;'  
 // Place all significant initialization in InitInstance 5Zzr5 WM  
} F ZM2   
l&vm[3  
CHookApp theApp; qjJ{+Rz2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $+0=GN  
{ lGl[^ 0  
 BOOL bProcessed=FALSE; `!]R!T@C  
 if(HC_ACTION==nCode) 4n#YDZ  
 { >7"$}5d  
  if((lParam&0xc0000000)==0xc0000000){// Key up "^Y6ctw  
   switch(wParam) }7-7t{G  
   { 7&=-a|k~  
    case VK_MENU: p| Vmdnb  
     MaskBits&=~ALTBIT; o?;F.W_  
     break; `8mD7xsg$  
    case VK_CONTROL: RfD{g"]y  
     MaskBits&=~CTRLBIT; 4 0p3Rv  
     break; r[6#G2  
    case VK_SHIFT: 7s0)3HR}  
     MaskBits&=~SHIFTBIT; z7| s%&  
     break; {qJHL;mP:8  
    default: //judge the key and send message mJSK; @w<O  
     break; @Q/x&BV  
   } G`9cd\^  
   for(int index=0;index<MAX_KEY;index++){ \I'f3  
    if(hCallWnd[index]==NULL) +SAk:3.#CV  
     continue; ^).WW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (s5<  
    { w:ORmR .p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KuIBYaK, g  
     bProcessed=TRUE; <j{0!J@:  
    } pk;ffq@  
   } lb-S0plw  
  } \8=e |a5`  
  else if((lParam&0xc000ffff)==1){ //Key down y;zt_O/  
   switch(wParam) ,:Rft  
   { }DJ|9D^yf  
    case VK_MENU: 0m]~J_   
     MaskBits|=ALTBIT; A*G )CG  
     break; %~][?Y ><  
    case VK_CONTROL: 3Gc ,I:\  
     MaskBits|=CTRLBIT; $o/0A  
     break; zJz82jMm  
    case VK_SHIFT:  i<B:  
     MaskBits|=SHIFTBIT; Oqd"0Qt-  
     break; HyZVr2  
    default: //judge the key and send message i,mrMi c#  
     break; ERUs0na]  
   } ;% /6Y~/  
   for(int index=0;index<MAX_KEY;index++) GS$ZvO  
   { c1pq]mz|z  
    if(hCallWnd[index]==NULL) aQl?d<|+lk  
     continue; MZ;"J82p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,Wz[tYL*  
    { [?Mc4uT{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C/{nr-V3u  
     bProcessed=TRUE; 6{b%Jfo  
    } Wv6z%r<  
   } CPc"  
  } >2]Eaw&W  
  if(!bProcessed){ * i=?0M4S  
   for(int index=0;index<MAX_KEY;index++){ I;`Ko_i  
    if(hCallWnd[index]==NULL) 2$o2.$i81  
     continue; 1zh$IYrd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4w;r l(s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g4~X#}:z$O  
   } 8O"x;3I9  
  } kHt!S9r  
 } f}L>&^I)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /Ki0+(4  
} p2pTs&}S  
`E./p  
BOOL InitHotkey() dNR7e   
{ -&qRo0^3  
 if(hHook!=NULL){ 3%It~o?  
  nHookCount++; V-?sek{;  
  return TRUE; P@gu~!  
 } ?&whE!  
 else DBu)xr}7A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); EpFIKV!  
  if(hHook!=NULL) GVjv** U  
   nHookCount++; D=i0e8D!+  
  return (hHook!=NULL); s[0prm5.  
} G;PbTsW  
BOOL UnInit() {{^Mr)]5K  
{ ()+jrrK  
 if(nHookCount>1){ "o\6k"_c>  
  nHookCount--; JxX jDYrU  
  return TRUE; 0C7thl{Dms  
 } ;']vY  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .fio<mqi  
 if(unhooked==TRUE){ a -z23$3  
  nHookCount=0; UPfFT^=y  
  hHook=NULL; iFAoAw(  
 } gE-w]/1zD5  
 return unhooked; q8'@dH  
} M9uH&CD6U  
H$k![K6Uj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?=/}Ft  
{ zPX=MfF  
 BOOL bAdded=FALSE; @&~OB/7B:  
 for(int index=0;index<MAX_KEY;index++){ k#8S`W8^  
  if(hCallWnd[index]==0){ j6&zRFX  
   hCallWnd[index]=hWnd; G/LXUhuif  
   HotKey[index]=cKey; M^|"be~{'  
   HotKeyMask[index]=cMask; Q9Y9{T  
   bAdded=TRUE; MFc=B`/X  
   KeyCount++; !7O=<  
   break; yS:IRI.  
  } J[<D/WIH  
 } ;55tf l  
 return bAdded; ?L<UOv7;t  
} S7Iu?R_I  
vOvxQS}dBp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tj"v0u?zW  
{ H#1*'e>  
 BOOL bRemoved=FALSE; Ux%\Y.PPI  
 for(int index=0;index<MAX_KEY;index++){ !#@4xeBPo  
  if(hCallWnd[index]==hWnd){ 1cHSgpoJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %S(#cf!HP  
    hCallWnd[index]=NULL; $>S}acuC  
    HotKey[index]=0; Ov~S2?E8  
    HotKeyMask[index]=0; 5CH-:|(;=  
    bRemoved=TRUE; S`GXiwk  
    KeyCount--; C$AIP\j- )  
    break; 3]:p!Y`$  
   } By51dk 7  
  } UtW"U0A  
 } c{]r{FAx9o  
 return bRemoved; &9RW9u "  
} e-Ybac%  
6g~o3  
void VerifyWindow() i-i}`oN  
{ 5Gw!9{ke  
 for(int i=0;i<MAX_KEY;i++){ \Age9iz&  
  if(hCallWnd!=NULL){ :o.x=c B  
   if(!IsWindow(hCallWnd)){ <6}f2^  
    hCallWnd=NULL; c]g<XVI  
    HotKey=0; >'2w\Uk~:  
    HotKeyMask=0; UgnsV*e&  
    KeyCount--; /QV. U.>G  
   } SBN_>;$c5}  
  } Dj,+t+|  
 } &G7)s%q  
} w{:Oa7_A  
XoH[MJC  
BOOL CHookApp::InitInstance() +}`O^#<qLX  
{ <QkN}+B=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V~]'+A q>  
 hins=AfxGetInstanceHandle(); n&3iv ^  
 InitHotkey(); Gw\G+T?M-  
 return CWinApp::InitInstance(); 'sjJSc  
} 9GtVI^]  
RV#uy]  
int CHookApp::ExitInstance() Zs3]|bUR  
{ @T,H.#bL  
 VerifyWindow(); 7fN&Q~.  
 UnInit(); #g-*n@ 1  
 return CWinApp::ExitInstance(); PPj6QJ]R0  
} cvs"WX3  
~-`BSR  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `%mBu`A  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p~d)2TC4#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }VGI Y>v  
#if _MSC_VER > 1000 vS J<  
#pragma once Z68Wf5@to&  
#endif // _MSC_VER > 1000 9 .&Or4>  
~*cY&  9  
class CCaptureDlg : public CDialog ]UCk_zWsn1  
{ ik1L  
 // Construction R.2KYhp ,  
 public: rmg";(I  
  BOOL bTray; k^dCX+  
  BOOL bRegistered; ?{.b9`  
  BOOL RegisterHotkey(); Wf`Oye Rz  
  UCHAR cKey; ~Q$c!=   
  UCHAR cMask; eRl?9  
  void DeleteIcon(); :AqnWy  
  void AddIcon(); 1 <qVN'[  
  UINT nCount; .X<"pd*@e  
  void SaveBmp(); 1n"+~N^\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .2{C29g  
  // Dialog Data "13 :VTs[5  
  //{{AFX_DATA(CCaptureDlg) s:jL/%+COZ  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;FgEE%  
  CComboBox m_Key; [Tb3z:UUvf  
  BOOL m_bControl; tEWj}rX   
  BOOL m_bAlt; U+RCQTo  
  BOOL m_bShift; R/Dy05nloe  
  CString m_Path; (g )lv)4P  
  CString m_Number; G|PIH#  
  //}}AFX_DATA J,^pt Ql  
  // ClassWizard generated virtual function overrides Dho^^<`c+  
  //{{AFX_VIRTUAL(CCaptureDlg) P B6/<n9#  
 public: H:{(CY?t  
  virtual BOOL PreTranslateMessage(MSG* pMsg); k+Ma_H`  
 protected: G$x["  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4}_w4@(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H'= i  
  //}}AFX_VIRTUAL xU\:Vid+A  
  // Implementation Y^*$PED?  
 protected: ?D )qgH  
  HICON m_hIcon; 1TxhEXB  
  // Generated message map functions AZ]SRz9mKY  
  //{{AFX_MSG(CCaptureDlg) ]-s`#  
  virtual BOOL OnInitDialog(); _9O }d  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i2ml[;*,N  
  afx_msg void OnPaint(); sm&rR=b  
  afx_msg HCURSOR OnQueryDragIcon(); JmJ,~_  
  virtual void OnCancel(); B=Jd%Av  
  afx_msg void OnAbout(); 0.Ol@fO  
  afx_msg void OnBrowse(); =<FZ{4  
  afx_msg void OnChange(); 3d)+44G_)  
 //}}AFX_MSG c"sw@<HG  
 DECLARE_MESSAGE_MAP() _OxnHf:|  
}; .&yWHdQC:  
#endif (27F   
jf)JPa_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $evuPm8G  
#include "stdafx.h" tSXjp  
#include "Capture.h" _Fh0^O@  
#include "CaptureDlg.h" <T_Nlar^^  
#include <windowsx.h> Y)j,(9  
#pragma comment(lib,"hook.lib") 5$"[gdt)T  
#ifdef _DEBUG {8bY7NH|  
#define new DEBUG_NEW Bzy=@]`  
#undef THIS_FILE OB  i!fLa  
static char THIS_FILE[] = __FILE__; qP^0($  
#endif E~g}DKs_5  
#define IDM_SHELL WM_USER+1 )RCqsFjK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wPO@f~[Ji  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ohtn^o;C}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _2 !e!Z  
class CAboutDlg : public CDialog MdoWqpC  
{ 9B;Sk]y  
 public: eP'kY(g8   
  CAboutDlg(); VU'l~%ql  
  // Dialog Data JK8@J9(#  
  //{{AFX_DATA(CAboutDlg) ?>\]%$5o  
  enum { IDD = IDD_ABOUTBOX }; $Q$d\Yvi  
  //}}AFX_DATA vLT12v:)`  
  // ClassWizard generated virtual function overrides fm:{&(  
  //{{AFX_VIRTUAL(CAboutDlg) fUWm7>6VA>  
 protected: 0?L$)T-B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Xie dgy  
  //}}AFX_VIRTUAL n_Hn k4  
  // Implementation 3{L vKe  
 protected: +VW]%6 +  
  //{{AFX_MSG(CAboutDlg) ?QIQ,?.  
  //}}AFX_MSG <sFf'W_3{  
  DECLARE_MESSAGE_MAP() yExyx?j.  
}; m}'@S+k^  
Rw=E_q{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) , G/X"t ~  
{ 'nDT.i  
 //{{AFX_DATA_INIT(CAboutDlg) I/-w65J]  
 //}}AFX_DATA_INIT CY).I`aJ  
} r`g;k&"a  
gGdYh.K&e5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Z!i'Tbfn  
{ wkpVX*DfRE  
 CDialog::DoDataExchange(pDX); Mc3h  R0  
 //{{AFX_DATA_MAP(CAboutDlg) .p0n\ $r  
 //}}AFX_DATA_MAP d\Z4?@T<5  
} lR K ?%~  
sF3 l##Wv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) PWD]qtr  
 //{{AFX_MSG_MAP(CAboutDlg) k'q !MZU  
 // No message handlers +~{nU'  
 //}}AFX_MSG_MAP :Du{8rV  
END_MESSAGE_MAP() u]-El}*[  
KIY_EE$?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8=Y|B5   
: CDialog(CCaptureDlg::IDD, pParent) qq%_ksQ  
{ ^[z\KmUqt  
 //{{AFX_DATA_INIT(CCaptureDlg) )3\rp$]1  
  m_bControl = FALSE; |w]i$`3'I  
  m_bAlt = FALSE; &ziB#(&:H  
  m_bShift = FALSE; 8A]q!To  
  m_Path = _T("c:\\"); ;B7|tajd  
  m_Number = _T("0 picture captured."); G8-d%O p  
  nCount=0; 5e8-?w% e  
  bRegistered=FALSE; g\nL n#  
  bTray=FALSE; A"ph!* i{  
 //}}AFX_DATA_INIT kRa$jD^?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jtpNo~O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &'2l_b  
} 'u%;6'y  
,^66`C[G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ywtDz8!^u  
{ +Ws}a  
 CDialog::DoDataExchange(pDX); EMH}VigR  
 //{{AFX_DATA_MAP(CCaptureDlg) tl^;iE!-  
  DDX_Control(pDX, IDC_KEY, m_Key); c+XR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DYk->)   
  DDX_Check(pDX, IDC_ALT, m_bAlt); /38Pp%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); UiN ^x  
  DDX_Text(pDX, IDC_PATH, m_Path); by ee-BU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (8F?yBu  
 //}}AFX_DATA_MAP s_?* R  
} ,qh  
[~JN n  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >Nqkz?67  
//{{AFX_MSG_MAP(CCaptureDlg) @,$HqJ  
 ON_WM_SYSCOMMAND() @].aFhH`)  
 ON_WM_PAINT() fb=vO U  
 ON_WM_QUERYDRAGICON() l{ { #tW  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) X KeK;+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) EqwA8? M  
 ON_BN_CLICKED(ID_CHANGE, OnChange) OU=IV;V{  
//}}AFX_MSG_MAP \aRB   
END_MESSAGE_MAP() ;G&O"S><]c  
~i {)J  
BOOL CCaptureDlg::OnInitDialog() TU6EE  
{ ~a)2 0  
 CDialog::OnInitDialog(); L7'n<$F  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KiHAm|,  
 ASSERT(IDM_ABOUTBOX < 0xF000);  7cQw?C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ht!:e>z&4  
 if (pSysMenu != NULL) \05C'z3]  
 { KA[Su0  
  CString strAboutMenu; ~z"->.u  
  strAboutMenu.LoadString(IDS_ABOUTBOX); x6P^IkL:  
  if (!strAboutMenu.IsEmpty()) :P'5_YSi  
  { IiU|@f~k  
   pSysMenu->AppendMenu(MF_SEPARATOR); $S=OmdgR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cv&hT.1  
  } z`6KX93  
 } "K]4j]yU  
 SetIcon(m_hIcon, TRUE); // Set big icon @}}1xP4Sr  
 SetIcon(m_hIcon, FALSE); // Set small icon ^U1 +D^AJ  
 m_Key.SetCurSel(0); yrb%g~ELGn  
 RegisterHotkey(); I*t}gvUt9  
 CMenu* pMenu=GetSystemMenu(FALSE); A#\X-8/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xk<0QYv   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Jx,s.Z0@7,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S!bvU2d  
 return TRUE; // return TRUE unless you set the focus to a control '?[msX"aqa  
} s @9#hjv2  
5PySCGv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [#V! XdQ,  
{ 3 g!h4?^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {<Zqw]  
 { )v.FAV:  
  CAboutDlg dlgAbout; +<#-52br\  
  dlgAbout.DoModal(); o{eG6  
 } 7wiu%zfa:=  
 else riQ?'!a7  
 { HxAa,+k  
  CDialog::OnSysCommand(nID, lParam); z(` kWF1<  
 } OTm"Iwzu@  
} Ds$;{wl#x  
*9 xD]ZZF  
void CCaptureDlg::OnPaint() |9@;Muq;  
{ R 1\]Y  
 if (IsIconic()) !ym5' h  
 { '1IH^<b  
  CPaintDC dc(this); // device context for painting i;7jJ(#V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l$NEx0Dffz  
  // Center icon in client rectangle e;v2`2z2  
  int cxIcon = GetSystemMetrics(SM_CXICON); {643Dz<e  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'McVaPav  
  CRect rect; T!AQJ:;1  
  GetClientRect(&rect); A#{*A  
  int x = (rect.Width() - cxIcon + 1) / 2; o! N@W  
  int y = (rect.Height() - cyIcon + 1) / 2; *0tNun 5=3  
  // Draw the icon _=p|"~rN$  
  dc.DrawIcon(x, y, m_hIcon); gqamGLK  
 } :\XD.n-n  
 else 6y5~Kh6  
 { UJ+JVj   
  CDialog::OnPaint(); p<NgT1"{  
 } q9>w3 <  
} uW|y8 BP $  
gfHlY Q]  
HCURSOR CCaptureDlg::OnQueryDragIcon() #-O4x`W>  
{ w\a#Bfcv  
 return (HCURSOR) m_hIcon; xFh}%mwpt[  
} >U]. k8a)  
qx NV~aK  
void CCaptureDlg::OnCancel() auU{I y   
{ /fEXAk  
 if(bTray) j(hC't-  
  DeleteIcon(); [VH t#JuN,  
  CDialog::OnCancel(); #k6T_ki  
} `,z{70  
mE1*F'0a  
void CCaptureDlg::OnAbout() .FyC4"b=c  
{ U/;Vge8{  
 CAboutDlg dlg; Ex{]<6UAu  
 dlg.DoModal(); K>U &jH  
} o>h>#!e  
m;|I}{r  
void CCaptureDlg::OnBrowse() J=Z"sU=  
{ =>Efrma  
 CString str; 92R{V%)G  
 BROWSEINFO bi; 7UiU3SUcg  
 char name[MAX_PATH]; K} @q+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); a7ty&[\  
 bi.hwndOwner=GetSafeHwnd(); v2^CBKZ+  
 bi.pszDisplayName=name; >{[J+f{~|  
 bi.lpszTitle="Select folder"; ">7 bnOJ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; A.Njn(z?Lz  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); c s> W6  
 if(idl==NULL) G}g+2`  
  return; #=2~MXa@z7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5;+Bl@zGu  
 str.ReleaseBuffer(); x[E`2_Ff0  
 m_Path=str; U8z,N1]r*`  
 if(str.GetAt(str.GetLength()-1)!='\\') YZd4% zF  
  m_Path+="\\"; :\Dm=Q\  
 UpdateData(FALSE); ;%&@^;@k%  
} 4_eq@'9-q  
BR*U9K|W  
void CCaptureDlg::SaveBmp() G!uxpZ   
{ wS*UXF&f  
 CDC dc; te_D  ,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .$rcTZ  
 CBitmap bm; B7 T+a  
 int Width=GetSystemMetrics(SM_CXSCREEN); W#$rC<Jh]  
 int Height=GetSystemMetrics(SM_CYSCREEN); asb") NfIm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); R[6&{&E:  
 CDC tdc; !Wk "a7  
 tdc.CreateCompatibleDC(&dc); ay2.C BF  
 CBitmap*pOld=tdc.SelectObject(&bm); *@< jJP4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jw H)x  
 tdc.SelectObject(pOld); p("do1:  
 BITMAP btm; W/+0gh7`,(  
 bm.GetBitmap(&btm); }5|uA/B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q>?oV(sF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :'03*A_[  
 BITMAPINFOHEADER bih; JL1Whf  
 bih.biBitCount=btm.bmBitsPixel; M~v{\!S  
 bih.biClrImportant=0; d] {^  
 bih.biClrUsed=0; X#fI$9a  
 bih.biCompression=0; Cs<d\"+  
 bih.biHeight=btm.bmHeight; $K hc?v  
 bih.biPlanes=1; 5u8 YHv  
 bih.biSize=sizeof(BITMAPINFOHEADER); hhpH)Bi=  
 bih.biSizeImage=size; eG<32$I  
 bih.biWidth=btm.bmWidth; i4l?q#X  
 bih.biXPelsPerMeter=0; 3j6$!89'  
 bih.biYPelsPerMeter=0; z;LntQZp-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4IVCTz[  
 static int filecount=0; N9hBGa$  
 CString name; -Rmz`yOq}  
 name.Format("pict%04d.bmp",filecount++); MCvjdc3:  
 name=m_Path+name; +g*Ko@]m>  
 BITMAPFILEHEADER bfh; ey:3F%  
 bfh.bfReserved1=bfh.bfReserved2=0; \;~>AL*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); VrHFM(RNe  
 bfh.bfSize=54+size; Q%6*S!~  
 bfh.bfOffBits=54; 0YKG`W  
 CFile bf; 0 @>3fR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9d v+u6)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z5?xmffB  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U_+>4zdm  
  bf.WriteHuge(lpData,size); *5 5yF `  
  bf.Close(); @f5X AK?  
  nCount++; J::dY~@  
 } AV?*r-vWL.  
 GlobalFreePtr(lpData); \JX8`]|&  
 if(nCount==1) h4]yIM `8d  
  m_Number.Format("%d picture captured.",nCount); nlKWZYv  
 else N( Cfv3{  
  m_Number.Format("%d pictures captured.",nCount); 3S Dw-k  
  UpdateData(FALSE); ]kr OPM/  
} Al! P=h  
1L3L!@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &BP%~  
{ M!,WU[mP  
 if(pMsg -> message == WM_KEYDOWN) \'shnzs  
 { w zF"^CJ  
  if(pMsg -> wParam == VK_ESCAPE) B>Mk "WjQ  
   return TRUE; Y.ic=<0H  
  if(pMsg -> wParam == VK_RETURN) +Oo>V~  
   return TRUE; A@GyKx%x$  
 } `6'fX[j5  
 return CDialog::PreTranslateMessage(pMsg); ~"8b\oLW  
} i-$]Tg  
+~ HL"Vv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dQt]r  
{ ~R3@GaL1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !pgkUzMW  
  SaveBmp(); !-[e$?-  
  return FALSE; Rb?6N  
} ~ujY+ {  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wPOQy ~:  
 CMenu pop; .(D-vkz'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $Z #  
 CMenu*pMenu=pop.GetSubMenu(0); ! fY'^Ya?  
 pMenu->SetDefaultItem(ID_EXITICON); :9 .ik  
 CPoint pt; t!v#rn[  
 GetCursorPos(&pt); ]wZG4A  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PXWBc\  
 if(id==ID_EXITICON) \ 7jK6;R<  
  DeleteIcon(); N,L$+wm  
 else if(id==ID_EXIT) C/!kMMh>vV  
  OnCancel(); nF]lSg&]X  
 return FALSE; so1% MV  
} .,I^)8c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Bf.@B0\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SD |5v*  
 AddIcon(); *1|&uE&_R  
 return res; a=Pl3Uo  
} f/aSqhAW  
a(QYc?u  
void CCaptureDlg::AddIcon() w(0's'  
{ h?jKq2`  
 NOTIFYICONDATA data; ar }F^8Ku  
 data.cbSize=sizeof(NOTIFYICONDATA); y\]:&)?&C^  
 CString tip; ,iV|^]X3$/  
 tip.LoadString(IDS_ICONTIP); _O{3bIay3!  
 data.hIcon=GetIcon(0); Z)?B5FF  
 data.hWnd=GetSafeHwnd(); >yiK&LW^?  
 strcpy(data.szTip,tip); ,5.ve)/dE  
 data.uCallbackMessage=IDM_SHELL; `*^ f =y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; fnl~0   
 data.uID=98; %8s$l'Q;  
 Shell_NotifyIcon(NIM_ADD,&data); Xi$2MyRd  
 ShowWindow(SW_HIDE); sk6C/ '0:  
 bTray=TRUE; B E!HM{-  
} r Z%l?(  
~"xc 3(h  
void CCaptureDlg::DeleteIcon() }N dknut,  
{ xj\! Sn2  
 NOTIFYICONDATA data; Tc$Jvy-G4A  
 data.cbSize=sizeof(NOTIFYICONDATA); @p~f*b4H?  
 data.hWnd=GetSafeHwnd(); F$X"?fj  
 data.uID=98; ?U$H`[VF}  
 Shell_NotifyIcon(NIM_DELETE,&data); A&XI1. j6  
 ShowWindow(SW_SHOW); `ZhDoLpH<  
 SetForegroundWindow(); 7b7@"Zw*  
 ShowWindow(SW_SHOWNORMAL); e'Njl?>3  
 bTray=FALSE; 5 o-WA1  
} 7,X5]U&A<x  
2N B/&60<  
void CCaptureDlg::OnChange()   
{ j#6@ cO'`  
 RegisterHotkey(); ap,%)on^  
} = wEU+R_#o  
KPTp91  
BOOL CCaptureDlg::RegisterHotkey() ,NB?_\$c  
{ [M?'N w/[S  
 UpdateData(); :@K 1pAh4  
 UCHAR mask=0; zg>4/10P1q  
 UCHAR key=0; O7vJ`K(!  
 if(m_bControl) d.>Zn?u4L  
  mask|=4; :%!` R72  
 if(m_bAlt) 6ZKSet8  
  mask|=2; kbu.KU+  
 if(m_bShift) @M=xdZNyJ  
  mask|=1; B*B}eXUph  
  key=Key_Table[m_Key.GetCurSel()]; 4E:kDl*@  
 if(bRegistered){ f_'#wc6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .d/e?H:  
  bRegistered=FALSE; ,%Sf,h?"^  
 }  vf}.)  
 cMask=mask; =r=?N\7I  
 cKey=key; ?y"= jn  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;l4 epN  
 return bRegistered; rs`"Kz`(  
} O7,)#{  
&-.NkW@  
  四、小结 HX}9;O  
\?EnTu.  
  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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