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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: ~x,_A>a  
  Ih:Q}V#6  
  一、实现方法 N4+Cg t(  
]oV{JR]  
  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: Nf )YG!  
vd lss|  
#pragma data_seg("shareddata") @bA5uY!  
HHOOK hHook =NULL; //钩子句柄 AE7 7i,Xa  
UINT nHookCount =0; //挂接的程序数目 5K1cPU~o_b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 rgVRF44X{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ts,r,{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Qz[^J  
static int KeyCount =0; {jO+N+Ez9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 zE/l  
#pragma data_seg() /X_L>or  
_ACN  
  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。 **h4M2'C  
yIKpyyC9H  
  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: v`,!wS  
%N-aLw\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR x\G%  
cKey,UCHAR cMask) )9`HO?   
{ w U+r]SK@  
 BOOL bAdded=FALSE; Csuasi3]1d  
 for(int index=0;index<MAX_KEY;index++){  "M5  
  if(hCallWnd[index]==0){ 7zH2dqrj  
   hCallWnd[index]=hWnd; QZ&(e2z  
   HotKey[index]=cKey; *,Bm:F<m  
   HotKeyMask[index]=cMask; <Ja&z M  
   bAdded=TRUE; Z}$sY>E  
   KeyCount++; kaCN^yQ  
   break; {ze69 h  
  } $L= Dky7  
 } lq:q0>vyI  
 return bAdded; *gwaW!=  
} yo#r^iAr  
//删除热键 OY{fxBb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R/v|ZvI  
{ 7.Y;nem:(  
 BOOL bRemoved=FALSE; N] sbI)Z@  
 for(int index=0;index<MAX_KEY;index++){ vm|u~Yd,s  
  if(hCallWnd[index]==hWnd){ `6VnL)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B`-uZ9k   
    hCallWnd[index]=NULL; ^!S4?<v  
    HotKey[index]=0; zj r($?  
    HotKeyMask[index]=0; sR9$=91`  
    bRemoved=TRUE; ,<L4tp+y0  
    KeyCount--; &'/"=lK  
    break; O6Py  
   } jz<}9Kze  
  } 0;TiNrzg  
 } }oZ8esZU2  
 return bRemoved; 4nm.ea|  
} n' mrLZw  
1TTS@\  
t[q2 W"#.  
  DLL中的钩子函数如下: LKvX~68  
YxM\qy {Vr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^)9/Wz _x  
{ tM"vIz 05  
 BOOL bProcessed=FALSE; nqH[ y0  
 if(HC_ACTION==nCode) Oz%6y ri  
 { IQ<G .  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 A>gZl)c  
   switch(wParam) TQO|C?  
   {  ouCh2Y/_  
    case VK_MENU: ^rfR<Q`  
     MaskBits&=~ALTBIT; X>7Pqn'  
     break; q,ie)`  
    case VK_CONTROL: 7=N%$]DKZ  
     MaskBits&=~CTRLBIT; o`n8Fk}i  
     break; Xd:{.AXW  
    case VK_SHIFT: }T.>p#z  
     MaskBits&=~SHIFTBIT; $Zyuhji^  
     break; A]m*~Vj]  
    default: //judge the key and send message Cl3vp_  
     break; YMu#<ZG  
   } "&SE!3*m`I  
   for(int index=0;index<MAX_KEY;index++){ vx?KenO}  
    if(hCallWnd[index]==NULL) \9,lMK[b  
     continue; q}Po)IUT`5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "*#f^/LS  
    { SHYekX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :i>LESJq  
     bProcessed=TRUE; EC$F|T0f  
    } CL2zZk{u_  
   }  je$H}D  
  } G h+;Vrx  
  else if((lParam&0xc000ffff)==1){ //有键按下 XwEMF5[  
   switch(wParam) &c-V QP(  
   { eHUyV@  
    case VK_MENU: 1.p ?1"4\u  
     MaskBits|=ALTBIT; Q#yHH]U)X  
     break; B> E4,"  
    case VK_CONTROL: Lfx a^0  
     MaskBits|=CTRLBIT; x=>dmi3  
     break; EUt2 S_2P  
    case VK_SHIFT: LiHJm-  
     MaskBits|=SHIFTBIT; ^) s6`:  
     break; _lI(!tj(  
    default: //judge the key and send message NUiv"tAY  
     break; H8"RdKwg?  
   } o!h::j0,~  
   for(int index=0;index<MAX_KEY;index++){ #vK99 S2  
    if(hCallWnd[index]==NULL) I[Bp}6G  
     continue; ^Vth;!o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZWyf.VJ  
    { i8Be%y%y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qK;J:GT>  
     bProcessed=TRUE; r9}(FL /)b  
    } -d!84_d9  
   } *9KT@"v  
  } Jyd[Sc)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 / tkV/  
   for(int index=0;index<MAX_KEY;index++){ S8;c0}-  
    if(hCallWnd[index]==NULL) g[b;1$  
     continue; dn~k_J=p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hHMp=8J7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }:?_/$};  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 O:V.;q2]U  
   } :p<:0W2!  
  } 'h&>K,U?5  
 } ?aaYka]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,|+{C~Ojx  
} KxmB$x5-=8  
p&XuNk  
  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: W:f)#'  
sWA-_4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h{]0 H'g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aQWg?,Ju6  
&_QD1 TT  
  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: !Y^B{bh  
&z\?A2Mw%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z~ q="CA4  
{ AA|G &&1y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S2I{?y&K  
 { 4tiCxf)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 nm|"9|/  
  SaveBmp(); v~^*L iP+  
  return FALSE; ayf;'1  
 } <ihJp^kgQ  
 …… //其它处理及默认处理 FGMYpapc~  
} A8nf"mRD:  
p|>/Hz1v  
tp V61L   
  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。 wuqB['3  
KmF+3g~#s  
  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。 <UwA5X`0e.  
"8[Vb#=*e  
  二、编程步骤 A{hST~s  
u"q!p5P%q  
  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"; \$8p8MP<&D  
+P*,i$MV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; P^/e!%UgC  
vdulrnGqL  
  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; t-hN4WKH_A  
U,2\ TBz  
  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; b\"2O4K,)  
F>q%~  
  5、 添加代码,编译运行程序。 rYA4(rYq  
xe1xP@e?  
三、程序代码 O;;vz+ j  
^@q $c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL V/DdV}n!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;Uj=rS`Q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (@*#Pn|A  
#if _MSC_VER > 1000 f,0oCBLPO  
#pragma once sv>c)L}I  
#endif // _MSC_VER > 1000 A$'rT|>se  
#ifndef __AFXWIN_H__ %lK]m`(  
#error include 'stdafx.h' before including this file for PCH 'q*/P&x5  
#endif Dmk~t="Y  
#include "resource.h" // main symbols CY8=prC  
class CHookApp : public CWinApp HuL9' M  
{ c:`&QDF  
 public: SR 1UO'.  
  CHookApp(); 6n.C!,Zmn  
  // Overrides "(y|iS$^T  
  // ClassWizard generated virtual function overrides A!5)$>!o  
  //{{AFX_VIRTUAL(CHookApp) Z}6H529[  
 public: b"#|0d0  
  virtual BOOL InitInstance(); L}U fd >*  
  virtual int ExitInstance(); e0u* \b  
  //}}AFX_VIRTUAL $30lNZK1m8  
  //{{AFX_MSG(CHookApp) uw&'=G6v  
  // NOTE - the ClassWizard will add and remove member functions here. )e:u 6]  
  // DO NOT EDIT what you see in these blocks of generated code ! uJHf6Ye  
  //}}AFX_MSG YR/rN,  
  DECLARE_MESSAGE_MAP() n&uD=-  
}; ZTSNM)f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \c$! C8z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8|p*T&Cn&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (/l9@0Y.t  
BOOL InitHotkey(); =C2,?6!  
BOOL UnInit(); K1Wiiw  
#endif ijWn,bj  
)0Lv-Gs  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. oBTRO0.s+  
#include "stdafx.h" ul3._Q   
#include "hook.h" h3Z0NJ=xM  
#include <windowsx.h> Ke+#ww  
#ifdef _DEBUG KGb3n;]  
#define new DEBUG_NEW |Gh~Zu p  
#undef THIS_FILE H23-%+*J  
static char THIS_FILE[] = __FILE__; -^LEGKN  
#endif KC{ HX?  
#define MAX_KEY 100 }<kpvd+ps=  
#define CTRLBIT 0x04 ^cF_z}Zi+  
#define ALTBIT 0x02 =h 2zIcj  
#define SHIFTBIT 0x01 "S@%d(lg  
#pragma data_seg("shareddata") B?J #NFUb  
HHOOK hHook =NULL; U_c.Z{lC4  
UINT nHookCount =0; h"G#} C]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey u($y<Q)=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K%A:W  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %t^-Guz  
static int KeyCount =0; $u./%JS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]\<^rEU  
#pragma data_seg() d^WEfH  
HINSTANCE hins; [SJ*ks,]  
void VerifyWindow(); f#UT~/~bL2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {` Lem  
//{{AFX_MSG_MAP(CHookApp) cvvba 60  
// NOTE - the ClassWizard will add and remove mapping macros here. ']ussFaQ  
// DO NOT EDIT what you see in these blocks of generated code! `PR)7}/<  
//}}AFX_MSG_MAP aJ1<X8  
END_MESSAGE_MAP() r9uuVxBD  
!bG%@{WT  
CHookApp::CHookApp() (1(dL_?  
{ 3Vl?;~ :5  
 // TODO: add construction code here, Q<V?rPAcx  
 // Place all significant initialization in InitInstance  *w538Vb  
} V '4sOn  
D?3^>h  
CHookApp theApp; Yvu!Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fWywegh  
{ 0x\bDWZ_  
 BOOL bProcessed=FALSE; T Prqb  
 if(HC_ACTION==nCode) Gt^Fj&^  
 { 7"`%-a$7  
  if((lParam&0xc0000000)==0xc0000000){// Key up 195m0'zda  
   switch(wParam) ;X ]+r$_  
   { dk9'C  
    case VK_MENU: }Q?, O  
     MaskBits&=~ALTBIT; @e_ bG@  
     break; j\D_Z{m2  
    case VK_CONTROL: T8 ,?\7)S9  
     MaskBits&=~CTRLBIT; !giL~}j(R  
     break; O!(M:.  
    case VK_SHIFT: Ph'P<h:V  
     MaskBits&=~SHIFTBIT; $Aw"?&d"  
     break; 2WRa@;Tj  
    default: //judge the key and send message .>0j<|~  
     break; ,=tPh4>  
   } `)5E_E3  
   for(int index=0;index<MAX_KEY;index++){ 0m^(|=N-  
    if(hCallWnd[index]==NULL) ) )q4Rh  
     continue; 8(e uWS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c|%.B2  
    {  s=&&gC1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Pvq74?an`  
     bProcessed=TRUE; Quy&CV{@  
    } lU0'5!3R,  
   } i"~J -{d}  
  } 'Tn i;  
  else if((lParam&0xc000ffff)==1){ //Key down m?]X NgT  
   switch(wParam) @Q;%hb  
   { \Q"j^4   
    case VK_MENU: I dsPB)k_  
     MaskBits|=ALTBIT; %- W3F5NK  
     break; "/e:V-W   
    case VK_CONTROL: x t7ZrT  
     MaskBits|=CTRLBIT; /G`'9cD  
     break; |UN0jR  
    case VK_SHIFT: XrY\ot`,D  
     MaskBits|=SHIFTBIT; 9K`(Ys&  
     break; [%M=nJ{8  
    default: //judge the key and send message l&@]   
     break; ?8AchbK; N  
   }  $^F L*w  
   for(int index=0;index<MAX_KEY;index++) !=7 (3< ?  
   { |N%?7PZ(  
    if(hCallWnd[index]==NULL) 8X,dVX5LT  
     continue; LD]a!eY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B8){  
    { p.1@4kgK&r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {k4)f ad\  
     bProcessed=TRUE; ;x/do?FbT  
    } `52+.*J+%  
   } N8!V%i?  
  } q#RUL!WF7U  
  if(!bProcessed){ f3Zm_zxj  
   for(int index=0;index<MAX_KEY;index++){ J!40` 8i  
    if(hCallWnd[index]==NULL) 5G!0Yy['  
     continue; &\8qN_`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J?]wA1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $#VEC0  
   } cZB?_[Cp  
  } l`S2bb6uMR  
 } km@V|"ac _  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }H^h ~E  
} |]--sUx:  
{k CCpU  
BOOL InitHotkey() hk6(y?#  
{ ~m:oJ+:O  
 if(hHook!=NULL){ [Dr'  
  nHookCount++; 0,b.;r  
  return TRUE; &PQhJ#YG  
 } ;gS)o#v0  
 else d 8YP<"V&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [{iPosQWj  
  if(hHook!=NULL) L|B/'  
   nHookCount++; uX82q.u_y  
  return (hHook!=NULL); H( L.k;B  
} dY=]ES} `  
BOOL UnInit() ~quof>  
{ f4%Z~3P  
 if(nHookCount>1){ RT+pB{Y  
  nHookCount--; 0R2KI,WI  
  return TRUE; J,iS<lV_  
 } 'e&L53n  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <}uhKp>*  
 if(unhooked==TRUE){ 0m2%ucKw  
  nHookCount=0; N>pTl$\4  
  hHook=NULL; QZwUv<*  
 } olm0O  (9  
 return unhooked; hn`yc7<}(u  
} o >wty3l:  
\#50; 8VJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FIMM\W  
{ RSfB9)3D  
 BOOL bAdded=FALSE; p!oO}gE  
 for(int index=0;index<MAX_KEY;index++){ ;H' ,PjU  
  if(hCallWnd[index]==0){ NL^;C3u  
   hCallWnd[index]=hWnd; ! 3 ;;6  
   HotKey[index]=cKey; u~O9"-m !V  
   HotKeyMask[index]=cMask; 83(-/ y  
   bAdded=TRUE; 7sX#6`t  
   KeyCount++; 'zJBp 9a%  
   break; $?Km3N\?v  
  } i'cGB5-j  
 } L`2(u!i J  
 return bAdded; AU$<W"%R  
} XWq`MwC9  
t6q7 w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5'<J@3B  
{ :$=]*54`T  
 BOOL bRemoved=FALSE; (X?HuWTm  
 for(int index=0;index<MAX_KEY;index++){ dz6&TdEl  
  if(hCallWnd[index]==hWnd){ t f3R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ awU! 3)B  
    hCallWnd[index]=NULL; `uwSxt  
    HotKey[index]=0; r@t \a+  
    HotKeyMask[index]=0; +B '<0  
    bRemoved=TRUE; +@^FUt=tq  
    KeyCount--; : uxJGx  
    break; sC'PtFK8z  
   } ).32Im!;#R  
  } >6KwZr BB  
 } aCRiW;+'  
 return bRemoved; #Zg pm"MW  
} ]."t  
x'v-]C(@  
void VerifyWindow() r9Vt}]$aG  
{ [-0=ZKH?  
 for(int i=0;i<MAX_KEY;i++){ RRb>]oD  
  if(hCallWnd!=NULL){ H73 r3BH  
   if(!IsWindow(hCallWnd)){ Pk3b#$+E  
    hCallWnd=NULL; ^/ff)'.J  
    HotKey=0; :@b=;  
    HotKeyMask=0; Dn l|B\  
    KeyCount--; }~v&  
   } a9uMgx}  
  } rDWwu '  
 } /EW=OZ/  
} Wh)>E!~ 9  
%oOSmt  
BOOL CHookApp::InitInstance() v t_lM  
{ {,=U]^A  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (j(hr'f  
 hins=AfxGetInstanceHandle(); -]Ny-[P  
 InitHotkey(); yJ:rry  
 return CWinApp::InitInstance(); F Jp<J  
} 7\AoMk}  
m;J'y2h =$  
int CHookApp::ExitInstance() yRivf.wH  
{ ok1w4#%,  
 VerifyWindow(); _ G$21=  
 UnInit(); J 1R5_b  
 return CWinApp::ExitInstance(); 2"QcjFW%  
} *`40B6dEr  
nGM;|6x"8|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `i vE: 3k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1j]vJ4R_\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rMoz+{1A  
#if _MSC_VER > 1000 '};mBW4z  
#pragma once \Ez&?yb/  
#endif // _MSC_VER > 1000 E#E&z(G2  
^U6VJ(58P  
class CCaptureDlg : public CDialog Cb6K!5[q]  
{ * qJHoP;  
 // Construction b5#Jo2C`AJ  
 public: lot;d3}  
  BOOL bTray; YIs_.CTi  
  BOOL bRegistered; ~J0r%P  
  BOOL RegisterHotkey(); *^iSP(dg  
  UCHAR cKey;  Xb~i?T;f  
  UCHAR cMask; Elt" tJ  
  void DeleteIcon(); 9+b){W  
  void AddIcon(); #bS}?fj  
  UINT nCount; !y862oKD  
  void SaveBmp(); a`D`v5G t  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7ju^B/ 7  
  // Dialog Data w5vzj%6i  
  //{{AFX_DATA(CCaptureDlg) DH"_.j  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3fUiYI|&7  
  CComboBox m_Key; ~ Zw37C9J  
  BOOL m_bControl; !iL6/  
  BOOL m_bAlt; "[sr0'g:  
  BOOL m_bShift; vs{VRc  
  CString m_Path; dt Br#Te  
  CString m_Number; ,va2:V  
  //}}AFX_DATA ~uG/F?= Q:  
  // ClassWizard generated virtual function overrides Jv8VM\ *  
  //{{AFX_VIRTUAL(CCaptureDlg) VHLt, ?G  
 public: yuhY )T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xJin %:O  
 protected: <r)5jf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zul@aS !  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fjMmlp  
  //}}AFX_VIRTUAL xP 7mP+D  
  // Implementation It]GlxMX  
 protected: M}`T-"qf  
  HICON m_hIcon; I0N~>SpZ5  
  // Generated message map functions ]l"9B'XR  
  //{{AFX_MSG(CCaptureDlg) SB:z[kfz|  
  virtual BOOL OnInitDialog(); )K]<\Q[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); od^o9(.W^  
  afx_msg void OnPaint(); Z?qc4Cg  
  afx_msg HCURSOR OnQueryDragIcon(); {]iM5?  
  virtual void OnCancel(); :|-^et]a8  
  afx_msg void OnAbout(); 7HJH9@8V  
  afx_msg void OnBrowse(); \0)2 u[7  
  afx_msg void OnChange(); @o&UF-=MW(  
 //}}AFX_MSG EvT"+;9/p  
 DECLARE_MESSAGE_MAP() Pk6_1LV  
}; paUJq?Af  
#endif zhh6;>P  
0S\HO<~k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ) >N=B2P  
#include "stdafx.h" lI3d _cU  
#include "Capture.h" p::`1  
#include "CaptureDlg.h" /PpZ6ne~ [  
#include <windowsx.h> xs?]DJj  
#pragma comment(lib,"hook.lib") ?[.g~DK,  
#ifdef _DEBUG ^vZu[ m  
#define new DEBUG_NEW !,~C  
#undef THIS_FILE Gb.}af#v  
static char THIS_FILE[] = __FILE__; @2eH;?uO  
#endif F<O<=Ww  
#define IDM_SHELL WM_USER+1 ~7H?tp.Dw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b~?3HY:t~K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <U}25AR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U8eU[|-8O/  
class CAboutDlg : public CDialog }7i}dyQv}  
{ /+m7J"Km  
 public: ,UfB{BW  
  CAboutDlg(); D7C%Y^K]>E  
  // Dialog Data ):V)Hrq?x  
  //{{AFX_DATA(CAboutDlg) 0Hr)h{!F"  
  enum { IDD = IDD_ABOUTBOX }; ! H4uc  
  //}}AFX_DATA UO' X"`  
  // ClassWizard generated virtual function overrides a61?G!]  
  //{{AFX_VIRTUAL(CAboutDlg) 7mYBxE/  
 protected: 84gj%tw'-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h)T-7b  
  //}}AFX_VIRTUAL 9QkIMJf0e  
  // Implementation aT=V/Xh}d  
 protected: d-"[-+)-  
  //{{AFX_MSG(CAboutDlg) QezDm^<  
  //}}AFX_MSG 9z(h8H  
  DECLARE_MESSAGE_MAP() 7P D D  
}; (z'!'?v;  
0>0:ls  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nHB`<B  
{ !B&1{  
 //{{AFX_DATA_INIT(CAboutDlg) LiD-su D  
 //}}AFX_DATA_INIT |y2cI,&   
} m}nA- *  
u=6{P(5$j  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WR>2t&;E  
{  h93  
 CDialog::DoDataExchange(pDX); sJYs{Wm  
 //{{AFX_DATA_MAP(CAboutDlg) [>f4&yY  
 //}}AFX_DATA_MAP umc\x"i%  
} _xXDvBU  
!_[^%7"S1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) h>K%Ox R  
 //{{AFX_MSG_MAP(CAboutDlg) (?zZvW8  
 // No message handlers h2edA#bub  
 //}}AFX_MSG_MAP |h%fi-a:  
END_MESSAGE_MAP() f5QJj<@  
qbdv  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3mM.#2=@>  
: CDialog(CCaptureDlg::IDD, pParent) ppM^&6x^  
{ ]#oqum@Yf1  
 //{{AFX_DATA_INIT(CCaptureDlg) } g[(h=Qi  
  m_bControl = FALSE; #-u?+Nk/  
  m_bAlt = FALSE; %+Khj@aX  
  m_bShift = FALSE; )haHI)xR  
  m_Path = _T("c:\\"); u<{uUui}$v  
  m_Number = _T("0 picture captured."); #$9rH 2zd  
  nCount=0; j!<RY>u  
  bRegistered=FALSE; v:$Y |mh  
  bTray=FALSE; 18U CZ;)>  
 //}}AFX_DATA_INIT :j0r~*z-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nLjo3yvV..  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9}6^5f?|  
} u.sn"G-c  
gT6@0ANq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (Dx]!FFz  
{ (eAh8^)  
 CDialog::DoDataExchange(pDX); s*DDO67\W  
 //{{AFX_DATA_MAP(CCaptureDlg) a<K@rgQ  
  DDX_Control(pDX, IDC_KEY, m_Key); Fu cLcq2Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7|Tu@0XXA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~V4&l3o  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X`k[ J6  
  DDX_Text(pDX, IDC_PATH, m_Path); SggS8$a`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); K r&HT,>B  
 //}}AFX_DATA_MAP 3QrYH @7zx  
} hol54)7$3:  
Ng3MfbFG  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UN}jpu<h  
//{{AFX_MSG_MAP(CCaptureDlg) xdH*[  
 ON_WM_SYSCOMMAND() Pc4FEH/  
 ON_WM_PAINT() glppb$oB\  
 ON_WM_QUERYDRAGICON() G&Sp }  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) RT)*H>|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ' cl&S:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b%<i&YY#  
//}}AFX_MSG_MAP 7=ZB?@bU~  
END_MESSAGE_MAP() NwdA@"YQ|  
8PV`4=,OI  
BOOL CCaptureDlg::OnInitDialog() }$ Am;%?p  
{ :d<;h:^_  
 CDialog::OnInitDialog(); 217KJ~)'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -)tu$W*  
 ASSERT(IDM_ABOUTBOX < 0xF000); r='"X#CmV/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dZ7+Iw;m  
 if (pSysMenu != NULL) pU*dE   
 { , ]'?Gd  
  CString strAboutMenu; ZAPT5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Hs+VA$$*  
  if (!strAboutMenu.IsEmpty()) "oYyeT ,?  
  { YQ _3[[xT  
   pSysMenu->AppendMenu(MF_SEPARATOR); cFoDR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^V~r S8]gj  
  } ?1('s0s\,  
 } <Dw`Ur^X5  
 SetIcon(m_hIcon, TRUE); // Set big icon !#nlWX :~  
 SetIcon(m_hIcon, FALSE); // Set small icon p_jDnb#  
 m_Key.SetCurSel(0); !ldb_*)h  
 RegisterHotkey(); zZ|Si  
 CMenu* pMenu=GetSystemMenu(FALSE); 1;[\xqJ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); o~F @1  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); q@p-)+D;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Vet7a_  
 return TRUE; // return TRUE unless you set the focus to a control "K z=Z C  
} 4cql?W(D  
2hRaYX,g  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) EIwTx:{F  
{ V>j6Juh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <m80e),~  
 { _n(NPFV  
  CAboutDlg dlgAbout; }xHoitOD  
  dlgAbout.DoModal(); ~:f9,  
 } 9psX"*s  
 else ` =!&9o  
 { z$E+xZ  
  CDialog::OnSysCommand(nID, lParam); pI |;  
 } ' @M  
} >yn%.Uoh@  
d9[*&[2J|  
void CCaptureDlg::OnPaint() n}qHt0N  
{ H'$g!Pg  
 if (IsIconic())  XGEAcN  
 { !p1OBS|  
  CPaintDC dc(this); // device context for painting h@T}WZv  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7{ :| )  
  // Center icon in client rectangle RR><so%  
  int cxIcon = GetSystemMetrics(SM_CXICON); {b>tX)Tep  
  int cyIcon = GetSystemMetrics(SM_CYICON); Te~"\`omJ3  
  CRect rect; a $g4 )0eS  
  GetClientRect(&rect); d(w $! $"h  
  int x = (rect.Width() - cxIcon + 1) / 2; U%ce0z  
  int y = (rect.Height() - cyIcon + 1) / 2; 5DfAL;o!  
  // Draw the icon <$n%h/2%  
  dc.DrawIcon(x, y, m_hIcon); WJZW5 Xt  
 } mk1;22o{TX  
 else SM5i3EcFYP  
 { UcDJ%vI  
  CDialog::OnPaint(); [K[tL|EK  
 } ~<3qsA..  
} 4em7PmT  
vfJ}t#%UH  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2"NRnCx *  
{ SHPaSq'&N  
 return (HCURSOR) m_hIcon; Rs:<'A  
} ~!'%m(g  
#H(|+WEu  
void CCaptureDlg::OnCancel() )]!Ps` ,u  
{ rB}UFS)  
 if(bTray) Gu<3*@Ng  
  DeleteIcon(); I~MBR2$9  
  CDialog::OnCancel(); yE-&TW_q:>  
} @dcT8 YC  
_Q/D%7[pa  
void CCaptureDlg::OnAbout() (^Xp\dyZL  
{ pK4I?=A'  
 CAboutDlg dlg; $GUSTV  
 dlg.DoModal(); er^z:1'  
} X",fp  
>\8Bu#&s4  
void CCaptureDlg::OnBrowse() tuK"}HepB  
{ =R!=uml(  
 CString str; t/_w}  
 BROWSEINFO bi; -c%GlpZw  
 char name[MAX_PATH]; ~o%|#-S  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +GgWd=X.Y  
 bi.hwndOwner=GetSafeHwnd(); \*!?\Ko`W  
 bi.pszDisplayName=name; ,>2ijk#  
 bi.lpszTitle="Select folder"; EKk~~PhW 8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; n w @cAv  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); e6k}-<W*q  
 if(idl==NULL) |t|+pBB  
  return; z['>`Kt  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8^$}!9B~JZ  
 str.ReleaseBuffer(); ];^A8?  
 m_Path=str; RM-| ?%  
 if(str.GetAt(str.GetLength()-1)!='\\') `Te n2(D  
  m_Path+="\\"; Wk'KN o  
 UpdateData(FALSE); k _hiGg  
} 18Pc4~ >0  
=XJ SE+ 7  
void CCaptureDlg::SaveBmp() >f19P+  
{ ;Mc\>i/  
 CDC dc; 75@){ :  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !~m)_Q5?~  
 CBitmap bm; BkJV{>?_+  
 int Width=GetSystemMetrics(SM_CXSCREEN); HLAWx/c,j"  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,$mnD@)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); G|Ic6Sd  
 CDC tdc; c&3 ]%urL  
 tdc.CreateCompatibleDC(&dc); vML01SAi  
 CBitmap*pOld=tdc.SelectObject(&bm); ,2[laJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); u1ggLH!U  
 tdc.SelectObject(pOld);  e1S |&W8  
 BITMAP btm; vX)JJ|g  
 bm.GetBitmap(&btm); K-)_1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q>%KIBh(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wtetB')yD  
 BITMAPINFOHEADER bih; B=7bQli}  
 bih.biBitCount=btm.bmBitsPixel; 2JYyvJ>  
 bih.biClrImportant=0; /Bid:@R  
 bih.biClrUsed=0; . 3=WE@M  
 bih.biCompression=0; y^pk)`y8  
 bih.biHeight=btm.bmHeight; {~k /xM.-  
 bih.biPlanes=1; bec n$R  
 bih.biSize=sizeof(BITMAPINFOHEADER); $f*N  
 bih.biSizeImage=size; ln'7kg  
 bih.biWidth=btm.bmWidth;  ]P(:z  
 bih.biXPelsPerMeter=0; d%81}4f:  
 bih.biYPelsPerMeter=0; c7q1;X{:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %(Nu"3|$K=  
 static int filecount=0; ['sj'3cW-  
 CString name; qWHH% L;  
 name.Format("pict%04d.bmp",filecount++); /0d_{Y+9  
 name=m_Path+name; qWGnIPk  
 BITMAPFILEHEADER bfh; n(/(F `  
 bfh.bfReserved1=bfh.bfReserved2=0; R(kr@hM  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _,=A\C_b@  
 bfh.bfSize=54+size; |J'@-*5?[8  
 bfh.bfOffBits=54; 0V"r$7(}  
 CFile bf; >1,.4)k%K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ XN5EZ#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?&_ -,\t  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CK 3]]{  
  bf.WriteHuge(lpData,size); EJ.oq*W!*J  
  bf.Close(); he wX)  
  nCount++; V2,54YE  
 } U voX\  
 GlobalFreePtr(lpData); GX&BUP\  
 if(nCount==1) -f#0$Z/0  
  m_Number.Format("%d picture captured.",nCount); "8&pT^  
 else 7!#x-KR~5  
  m_Number.Format("%d pictures captured.",nCount); "nU5c4   
  UpdateData(FALSE); (\, <RC\  
} ?5Wjy  
yaMNt}y-q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4v33{sp  
{ wxkCmrV  
 if(pMsg -> message == WM_KEYDOWN)  nk>  
 { (#BkL:dg  
  if(pMsg -> wParam == VK_ESCAPE) ePq(:ih  
   return TRUE; a57Y9.H`o  
  if(pMsg -> wParam == VK_RETURN) xM8}Xo  
   return TRUE; fB:9:NX  
 } ]U!vZY@\  
 return CDialog::PreTranslateMessage(pMsg); f'0n^mSP  
} aA-A>z  
sHyhR:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^rfY9qMJr8  
{ [!]a' T#x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L$cNxz0$  
  SaveBmp(); \6-x~%xK  
  return FALSE; M")JbuI  
} ,3.E]_3 xX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bTHKMaGWC  
 CMenu pop; WM.JoQ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); jA$g0>  
 CMenu*pMenu=pop.GetSubMenu(0); s:7^R-"  
 pMenu->SetDefaultItem(ID_EXITICON); 8;ke,x  
 CPoint pt; S(.AE@U  
 GetCursorPos(&pt); ~YA* RCe  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \{t#V ~  
 if(id==ID_EXITICON) a*$to/^r  
  DeleteIcon(); mp!KPw08':  
 else if(id==ID_EXIT) @*]l.F   
  OnCancel(); ^ llZf$`  
 return FALSE; {E-.W"t4  
} nT..+ J)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9W:oo:dK F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _T&?H&#  
 AddIcon(); J0*hJ-/u  
 return res; _G|hKk^,  
} K 4QJDC8  
X^ckTIdR  
void CCaptureDlg::AddIcon() 8W#/=Xh?  
{ "~(qp_AI  
 NOTIFYICONDATA data; z8_m<uewz  
 data.cbSize=sizeof(NOTIFYICONDATA); ns[v.YDL  
 CString tip; {a\O7$A\F  
 tip.LoadString(IDS_ICONTIP); 5ppOG_  
 data.hIcon=GetIcon(0); |iKk'Rta4  
 data.hWnd=GetSafeHwnd(); (9% ki$=}+  
 strcpy(data.szTip,tip); bXF>{%(}E  
 data.uCallbackMessage=IDM_SHELL; Oi AZA<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -$**/~0zU  
 data.uID=98; U`N|pPe:w  
 Shell_NotifyIcon(NIM_ADD,&data); AD#]PSB  
 ShowWindow(SW_HIDE); V>ML-s9  
 bTray=TRUE; L^bt-QbhO  
} 7K,Quq.%+  
:K>v F`SM  
void CCaptureDlg::DeleteIcon() 3sIW4Cs7)U  
{ MGze IrV  
 NOTIFYICONDATA data; usH9dys,  
 data.cbSize=sizeof(NOTIFYICONDATA); u?5 d%]*  
 data.hWnd=GetSafeHwnd(); R''nZ/R  
 data.uID=98; S-}MS"  
 Shell_NotifyIcon(NIM_DELETE,&data); 0]4kR8R3[  
 ShowWindow(SW_SHOW); %tul(Z~<1  
 SetForegroundWindow(); [Oen{c9 A  
 ShowWindow(SW_SHOWNORMAL); 0B fqEAl  
 bTray=FALSE; o(w!x!["  
} k4fc 5P  
.) uUpY%K^  
void CCaptureDlg::OnChange() BZejqDr*  
{ |z\5Ik!fF]  
 RegisterHotkey(); |x@)%QeC  
} 7[h_"@_A7  
XK??5'&{  
BOOL CCaptureDlg::RegisterHotkey() IROX]f}r(  
{ ;Pf |\q  
 UpdateData(); sd9$4k"  
 UCHAR mask=0; i!+D ,O  
 UCHAR key=0; F1)B-wW  
 if(m_bControl) vQ/}E@?u  
  mask|=4; yI/2 e[  
 if(m_bAlt) nlmc/1C  
  mask|=2; *vt5dxB  
 if(m_bShift) A'r 3%mC  
  mask|=1; E9z^#@s  
  key=Key_Table[m_Key.GetCurSel()]; =y -L'z&r  
 if(bRegistered){ M4 SJnE  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rCfr&>nn  
  bRegistered=FALSE; <6QG7 i  
 } uMVM-(g%  
 cMask=mask; x2x) y08  
 cKey=key; JYuI~<:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mAMi-9  
 return bRegistered; **_`AM~  
} D,q=?~  
g?` g+:nug  
  四、小结 .w2QiJ  
Go~bQ2*'(/  
  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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