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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: JC4Z^/\.  
  +K[H! fD  
  一、实现方法 ZAMS;e+e  
F6)/Iiv  
  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: DKqO5e\l8@  
Zh.[f+l]  
#pragma data_seg("shareddata") P3V }cGZ  
HHOOK hHook =NULL; //钩子句柄 6-uB[$ko  
UINT nHookCount =0; //挂接的程序数目 !,>9?(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Le}-F{~`^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #[Vk#BIiv8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W>`#`u  
static int KeyCount =0; Fv9n>%W&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }4"T# [n#  
#pragma data_seg() MM4Eq>F/  
e5fzV.'5  
  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。 fHwr6"DJ  
}K\m.+%=d  
  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: P[C03a!lXg  
HCKj8-*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M]OZS\9.B  
cKey,UCHAR cMask) 1]Gp \P}  
{ *Ldno`1O  
 BOOL bAdded=FALSE; :0B' b  
 for(int index=0;index<MAX_KEY;index++){ ?]u=5gqUU  
  if(hCallWnd[index]==0){ mmrz:_  
   hCallWnd[index]=hWnd; ~b.e9FhdA  
   HotKey[index]=cKey; .[4Dv t|>6  
   HotKeyMask[index]=cMask; Og~3eL[1%C  
   bAdded=TRUE; 2s:$4]K D  
   KeyCount++; %{M&"Mv  
   break; xu7Q^F#u  
  } +cnBEv~y  
 } ,\n%e'  
 return bAdded; " )_-L8  
} o2M4?}TpIV  
//删除热键 |VD}:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |*WE@L5  
{ &%4*~;o  
 BOOL bRemoved=FALSE; F[ 5\ x0  
 for(int index=0;index<MAX_KEY;index++){ _lj&}>l  
  if(hCallWnd[index]==hWnd){ /DBldL7yi  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Da"GYEC  
    hCallWnd[index]=NULL; @-QDp`QtI  
    HotKey[index]=0; * >XmJ6w  
    HotKeyMask[index]=0; Zl+Ba   
    bRemoved=TRUE; R3=]Av46  
    KeyCount--; Xm! ;  
    break; 5?n@.hcL  
   } , HE +|y#  
  } I,xV&j+<  
 } #ig* !  
 return bRemoved; / !*+9+h  
} `<:D.9vO "  
(G 3S+T 9  
Mli`[8@(  
  DLL中的钩子函数如下: + (|6Wv  
%"0g}tK6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =icynW^Fr  
{ n@Ar%%\  
 BOOL bProcessed=FALSE; p/k6}Wl  
 if(HC_ACTION==nCode) otgU6S7F  
 { psZAO,p  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 EecV%E  
   switch(wParam) T1Q c?5K^  
   {  R~R?0aq  
    case VK_MENU: `Mxi2Y{vp  
     MaskBits&=~ALTBIT; 8XU m.nV  
     break; xrPC  
    case VK_CONTROL: M[@=m[#a  
     MaskBits&=~CTRLBIT; _a 40lcP  
     break; jw"]U jub  
    case VK_SHIFT: oHbG-p  
     MaskBits&=~SHIFTBIT; # ,KjJ  
     break; DVWqrK}q  
    default: //judge the key and send message XPt<k&o1,  
     break;  :nHa-N3  
   } Dr!g$,9  
   for(int index=0;index<MAX_KEY;index++){ J~jR`2+r  
    if(hCallWnd[index]==NULL) s@ ~Y!A  
     continue; LPNJuz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j}CZ*  
    { rI E m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [0(+E2/:2  
     bProcessed=TRUE; dSkW[r9Z%l  
    } ,L"1Ah  
   } Nn_n@K  
  } nKzS2 u=:Y  
  else if((lParam&0xc000ffff)==1){ //有键按下 BSGC.>$s  
   switch(wParam) A80r@)i  
   { ,/=Fm  
    case VK_MENU: hw@ `Q@  
     MaskBits|=ALTBIT; \!erP!$x .  
     break; :q.g#:1s  
    case VK_CONTROL: )NoNgU\7!  
     MaskBits|=CTRLBIT; 3:XF7T  
     break; YQ&Ww|xe  
    case VK_SHIFT: '9+JaB  
     MaskBits|=SHIFTBIT; <QUjhWxDb  
     break; e-Xr^@M*Q  
    default: //judge the key and send message t4RI%m\  
     break; fq@r6\TI  
   } _NfdJ=[Xh  
   for(int index=0;index<MAX_KEY;index++){ k_E Jg;(  
    if(hCallWnd[index]==NULL) GI~JIXHTQ  
     continue; <Be:fnPX7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fL #e4  
    { 8gQg#^,(t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); LRJY63A  
     bProcessed=TRUE; gH+s)6  
    } m zh8<w?ns  
   } fd{75J5%  
  } x:7"/H|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 XYi-o][Mf  
   for(int index=0;index<MAX_KEY;index++){ _M;n.?H  
    if(hCallWnd[index]==NULL) \F$Vm'f_  
     continue; (;9-8Y&_d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KI@OEy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }#u.Of`6"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1Mftq4nq  
   } I`$"6 Xy  
  } !O`aaLc  
 } ~o_zV'^f@o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?5N7,|K)  
} Hwz.5hV"  
eHQS\n  
  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: t",=]k  
 iI!MF1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f,jN"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6n|R<DO%\  
\]j{  
  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: ,P%a0\  
{Wi)/B}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,2|(UTv  
{ Oc Gg'R7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mMNT.a  
 { XF6ed  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'n>v}__&|  
  SaveBmp(); sjZ@}Vk3b  
  return FALSE; c:J;Q){Xz  
 } ii3{HJ*C  
 …… //其它处理及默认处理 \ah.@s  
} A~@u#]]<n  
(~6D`g`B  
W~!uSrY  
  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。 lYF~CNvE  
W Ai91K@  
  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。 d)R7#HLZ7  
CeZ+!-lG  
  二、编程步骤 S'h{["P~ 0  
1edeV48{:  
  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"; IO@Ti(,  
0SHF 8kek  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z]twh&^1L  
TtWE:xE  
  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; 6h5,XcO4  
0b)q,]l]  
  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; {:63% j  
<>Nq ]WqA  
  5、 添加代码,编译运行程序。 ?o D]J  
5x2m ]u  
三、程序代码 N!{waPbPi  
;8~tt I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL < Z>p1S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nNEIwlj;  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Fk-}2_=v i  
#if _MSC_VER > 1000 'm4v)w<y#  
#pragma once JZUf-0q  
#endif // _MSC_VER > 1000 l0v]+>1i:  
#ifndef __AFXWIN_H__ Ag82tDL[u  
#error include 'stdafx.h' before including this file for PCH fF|m~#y  
#endif G-DvM6T  
#include "resource.h" // main symbols !W4X4@  
class CHookApp : public CWinApp @V7HxW7RX  
{ q-3e^-S*  
 public: Edp%z"J;C  
  CHookApp(); ,&q Q[i  
  // Overrides "!AbH<M;@  
  // ClassWizard generated virtual function overrides Qy!;RaA3T  
  //{{AFX_VIRTUAL(CHookApp) Ih;I&D+e;  
 public: zm&?G  
  virtual BOOL InitInstance(); ] 'B4O1  
  virtual int ExitInstance(); 8HaBil  
  //}}AFX_VIRTUAL YQ`m;<  
  //{{AFX_MSG(CHookApp) K:JM*4W  
  // NOTE - the ClassWizard will add and remove member functions here. A7hWAq  
  // DO NOT EDIT what you see in these blocks of generated code ! a3Fe42G2c|  
  //}}AFX_MSG ssx #\  
  DECLARE_MESSAGE_MAP() 0sR+@\  
}; |EjMpRNE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D-S"?aO-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *}Cm/li/w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !</Snsi  
BOOL InitHotkey(); 8%,u~ELA  
BOOL UnInit(); w(EUe4 w{  
#endif Wu1">|  
B7u4e8(E*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t*Xo@KA  
#include "stdafx.h" q=J8SvSRl  
#include "hook.h" 1M<;}hJ{/  
#include <windowsx.h> ~\QN.a   
#ifdef _DEBUG )/Mk\``j  
#define new DEBUG_NEW X%lk] &2  
#undef THIS_FILE HC$rC"f  
static char THIS_FILE[] = __FILE__; o6@`aU  
#endif q qFN4AO  
#define MAX_KEY 100 Q$B\)9`v[  
#define CTRLBIT 0x04 ? JliKFD%  
#define ALTBIT 0x02 AnD#k ]  
#define SHIFTBIT 0x01 # VAL\Z  
#pragma data_seg("shareddata") l.Yq4qW  
HHOOK hHook =NULL; C"[d bh!  
UINT nHookCount =0; ]T<\d-!CZN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey OV+|j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT g4U`Qf3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bPL.8hX   
static int KeyCount =0; so]p1@K  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RX cfd-us  
#pragma data_seg() FhAYk  
HINSTANCE hins; [Q:C\f]  
void VerifyWindow(); 7FYq6wi  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !hc#il'g].  
//{{AFX_MSG_MAP(CHookApp) l2ww3)Z  
// NOTE - the ClassWizard will add and remove mapping macros here. |j w{7\+  
// DO NOT EDIT what you see in these blocks of generated code! p8bAz  
//}}AFX_MSG_MAP |3K]>Lio  
END_MESSAGE_MAP() J*zm*~8\  
-q")qNt.  
CHookApp::CHookApp() 1!"iN~  
{ T{B\1|2w  
 // TODO: add construction code here, YX,xC-37y  
 // Place all significant initialization in InitInstance mzH3Q564  
} :3 p&h[M  
@Z[XV"w|  
CHookApp theApp; U+7!Vpq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C<"b99\2`  
{ \1[v-hvK  
 BOOL bProcessed=FALSE; !`S61~gE  
 if(HC_ACTION==nCode) X6 SqOb\(a  
 { Z-;I,\Y%  
  if((lParam&0xc0000000)==0xc0000000){// Key up u[b0MNE~  
   switch(wParam) h5p,BRtu  
   { `ZELw=kLL  
    case VK_MENU: rpn&.#KS  
     MaskBits&=~ALTBIT; -D^.I  
     break; +|c1G[Jh  
    case VK_CONTROL: K=Y{iHn  
     MaskBits&=~CTRLBIT; ~H\1dCW  
     break; #Ab,h#f*7  
    case VK_SHIFT: C[2LP$6*/  
     MaskBits&=~SHIFTBIT; 1yT\|2ARZ%  
     break; I>n2# -8  
    default: //judge the key and send message XMi)PXs$  
     break; lDF26<<\`  
   } ~X2 cTG!,  
   for(int index=0;index<MAX_KEY;index++){ ov%.+5P  
    if(hCallWnd[index]==NULL) s{@3G8  
     continue; ^^ +vt8|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sA1 XtO<&7  
    { 2 i:tPe&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); geJO#;  
     bProcessed=TRUE; csCi0'u  
    } o)SA^5  
   } 6SVh6o@]  
  } Ps=<@,dks  
  else if((lParam&0xc000ffff)==1){ //Key down 0{Bhr12V  
   switch(wParam) 6e q`/~#  
   { Y V#|qb  
    case VK_MENU: =Xu(Js-  
     MaskBits|=ALTBIT; eczS(KoL4  
     break; h$#zuqm  
    case VK_CONTROL: g'nN#O  
     MaskBits|=CTRLBIT; wfY]J0l  
     break; ,`.`}'  
    case VK_SHIFT: w829 8Kl  
     MaskBits|=SHIFTBIT; ^/_1y[j  
     break; kO'_g1f<[  
    default: //judge the key and send message ^E|{i]j#f  
     break; ly)L%hG  
   } \h UE, ^  
   for(int index=0;index<MAX_KEY;index++) ; w+<yW}EL  
   { ^eHf'^Cvvu  
    if(hCallWnd[index]==NULL) <F#/wU^9  
     continue; 3X]\p}]z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d`ESe'j:  
    { 6j5?&)xJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g4=6\vg  
     bProcessed=TRUE; ^_o9%)RL(  
    } F]k$O$)0  
   } zbyJ5~  
  } <lFQ4<"m  
  if(!bProcessed){ #`Gh8n#  
   for(int index=0;index<MAX_KEY;index++){ Zg2F%f$Y  
    if(hCallWnd[index]==NULL) /Q*cyLv  
     continue; m~U2 L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Yh 9fIRR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D`fi\A  
   } WlfS|/\%V^  
  } w$)E#|i  
 } 6z>Zm1h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (25v7 Y ]  
} 69K*]s  
Ii4lwZnz  
BOOL InitHotkey() Z2soy-  
{ 7\p<k/TS  
 if(hHook!=NULL){ +' f38D*  
  nHookCount++; '@ C\,E  
  return TRUE; pGhA  
 } 3t^r;b  
 else L?~-<k  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^"hsbk&Yu  
  if(hHook!=NULL) "J(7fL$!  
   nHookCount++; T.R(  
  return (hHook!=NULL); j@b18wZ  
} 2 bQC 2  
BOOL UnInit() H;nq4;^yK  
{ }iF"&b0n"  
 if(nHookCount>1){ vJE>H4qPmD  
  nHookCount--; Gkq<?q({t  
  return TRUE; d}e/f)(  
 } J;S@Q/s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); is,r:  
 if(unhooked==TRUE){ $Y Cy,Ew   
  nHookCount=0; |=CV.Su  
  hHook=NULL; Tr@}  
 } SpG^kI #  
 return unhooked; &:ib>EB03=  
} |Lz:i +;  
wtL_c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;}=[( eqA  
{ Nq3q##Ut:  
 BOOL bAdded=FALSE; Ikbz3]F^V  
 for(int index=0;index<MAX_KEY;index++){ =W Q_5}  
  if(hCallWnd[index]==0){ ?[K \X  
   hCallWnd[index]=hWnd; USrg,A  
   HotKey[index]=cKey; QA3q9,C"  
   HotKeyMask[index]=cMask; Z*Qra4GBl]  
   bAdded=TRUE; V/jEMJNks  
   KeyCount++; Q<F-l. q   
   break; _a3,Zuv  
  } ;2=H7dq  
 } zXHCP.Rmg  
 return bAdded; (!0=~x|Z[  
} E?/Bf@a28=  
SmJ6Fm6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D; 0iNcit  
{ <Hq|<^_K  
 BOOL bRemoved=FALSE; X(;,-7Jw  
 for(int index=0;index<MAX_KEY;index++){ T;u>]"S  
  if(hCallWnd[index]==hWnd){ 8yDu(.Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1Lf:TQB  
    hCallWnd[index]=NULL; k^IC"p Uc  
    HotKey[index]=0; Jm+hDZrW  
    HotKeyMask[index]=0; .CL\``  
    bRemoved=TRUE; 6jRUkI-!  
    KeyCount--; 1x^(vn#=  
    break; -$]Tn#`Fb  
   } ?r,lgaw  
  } u}7#3JfLn  
 } ttwfWfX  
 return bRemoved; IaU  
} n0T'"i[  
W]UGo,  
void VerifyWindow() 6J|Y+Y$  
{ 4D`T_l  
 for(int i=0;i<MAX_KEY;i++){ v_gQCS  
  if(hCallWnd!=NULL){ YAIDSZ&l[  
   if(!IsWindow(hCallWnd)){ ~ZSP K;D[  
    hCallWnd=NULL; Xh,{/5m  
    HotKey=0; <E(#;F^y  
    HotKeyMask=0; x"Hi!h)v  
    KeyCount--; /Wh} ;YTv^  
   } }D7q)_g=  
  } L{)e1p]q  
 } 76\ir<1up  
} eoS8e$}  
\wxS~T<&L  
BOOL CHookApp::InitInstance() "(hhb>V1Wl  
{ R^.oM1qu|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =-`}(b2N  
 hins=AfxGetInstanceHandle(); XM$HHk}L;  
 InitHotkey(); Q`qHzb~%  
 return CWinApp::InitInstance(); O6^>L0'  
} i '5Q.uX  
+oZq~2?*S6  
int CHookApp::ExitInstance() K.Tfu"6  
{ ;J~NfL  
 VerifyWindow(); ?Mg&e/^  
 UnInit(); @LS*WJ< w-  
 return CWinApp::ExitInstance(); );wSay>%(  
} n# %mL<  
u6A ReL 'f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file IRemF@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d7y`AS@q6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Zu\(XN?62  
#if _MSC_VER > 1000 X=Q)R1~6v  
#pragma once ?v>!wuiP  
#endif // _MSC_VER > 1000 x.CNDG  
/HsJyp+t  
class CCaptureDlg : public CDialog *7C t#GC  
{ 0sv#* &0=  
 // Construction 4|uh&4"*@W  
 public: ; /fZh:V2  
  BOOL bTray; GNzk Vy:u  
  BOOL bRegistered; Fg)Iw<7_2  
  BOOL RegisterHotkey(); ] ZGP  
  UCHAR cKey; bu[v[U4  
  UCHAR cMask; kzG m D i  
  void DeleteIcon(); nk,X6o9%  
  void AddIcon(); 6.},y<E  
  UINT nCount; }&)X4=  
  void SaveBmp(); -aDGXQM{~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  u%<Je  
  // Dialog Data ty|E[Ez1  
  //{{AFX_DATA(CCaptureDlg) kzqW&`xn?  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;Ft_ Xiq  
  CComboBox m_Key; LMf_wsp  
  BOOL m_bControl; }1P>^I"[Y  
  BOOL m_bAlt; |*W`}i  
  BOOL m_bShift; JzJS?ZF  
  CString m_Path; a$p?r3y  
  CString m_Number; G[1:<Vg8  
  //}}AFX_DATA sr+* q6W  
  // ClassWizard generated virtual function overrides 4=S.U`t7  
  //{{AFX_VIRTUAL(CCaptureDlg) .7Zb,r  
 public: %e2,p&0G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); F_o5(`>^  
 protected: { as#lHn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PG<tic<?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =B g  
  //}}AFX_VIRTUAL a9C8Q l  
  // Implementation Y<0;;tVf4U  
 protected: $<.\,wW*'w  
  HICON m_hIcon; bI 3o|  
  // Generated message map functions /s"mqBXCG  
  //{{AFX_MSG(CCaptureDlg) ;Bk?,g  
  virtual BOOL OnInitDialog(); x2 *l5t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I@a y&NNh  
  afx_msg void OnPaint(); .5*h']iFr1  
  afx_msg HCURSOR OnQueryDragIcon(); ld8E!t[  
  virtual void OnCancel(); S>isWte  
  afx_msg void OnAbout(); iB;EV8E  
  afx_msg void OnBrowse(); ES[H^}|Gi  
  afx_msg void OnChange(); p]/HZS.-b  
 //}}AFX_MSG m?DI]sIv#  
 DECLARE_MESSAGE_MAP() f 4CS  
}; 1'or[Os3=  
#endif {.=089`{  
45` i  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~0"(C#l 9  
#include "stdafx.h" jj2 [Zh/h  
#include "Capture.h" +;uP) "Q/L  
#include "CaptureDlg.h" e^)+bmh  
#include <windowsx.h> P(BjXMd  
#pragma comment(lib,"hook.lib") Q>R jv.1  
#ifdef _DEBUG m~c z  
#define new DEBUG_NEW TbqH-R3W  
#undef THIS_FILE ^'j? { @  
static char THIS_FILE[] = __FILE__; ]n9o=^q/  
#endif A)9OkLrc  
#define IDM_SHELL WM_USER+1 U5N/'p%)<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e&WlJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ME"B1 Se\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; n1+1/  
class CAboutDlg : public CDialog ?.t naE  
{ 6-8,qk  
 public: K.s\xA5`_  
  CAboutDlg(); EXDZehLD<]  
  // Dialog Data .)L%ANf  
  //{{AFX_DATA(CAboutDlg) \$GM4:R D  
  enum { IDD = IDD_ABOUTBOX }; mw2/jA7  
  //}}AFX_DATA ]X y2km]  
  // ClassWizard generated virtual function overrides s8L=:hiSf)  
  //{{AFX_VIRTUAL(CAboutDlg) 32nB9[l  
 protected: a*?bnw?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XpWcf ([  
  //}}AFX_VIRTUAL {j$:9  H  
  // Implementation VfWU-lJ  
 protected: /J''`Tf  
  //{{AFX_MSG(CAboutDlg) LpCJfQ  
  //}}AFX_MSG a6\0XVU  
  DECLARE_MESSAGE_MAP() N 4Kj)E@  
}; 2d),*Cvf  
jeb ]3i=pw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)  A [W3.$s  
{ h9<*+T  
 //{{AFX_DATA_INIT(CAboutDlg) /-%0y2"7  
 //}}AFX_DATA_INIT D d['e  
} $gZC"~BR  
qiEw[3Za]'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .nDB{@#  
{ KrVP#|9%"  
 CDialog::DoDataExchange(pDX); og0su  
 //{{AFX_DATA_MAP(CAboutDlg) HRQ3v`P.  
 //}}AFX_DATA_MAP G8bc\]  
} {}gx;v)  
BwpEIV@b]  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N_jpCCG~  
 //{{AFX_MSG_MAP(CAboutDlg) +H"[WZ5  
 // No message handlers #aHPB#  
 //}}AFX_MSG_MAP EWz,K] _'  
END_MESSAGE_MAP() 1eod;^AP9  
XT2:XWI8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p>Z18  
: CDialog(CCaptureDlg::IDD, pParent) ,xcm:; &  
{ jEK{QOq0  
 //{{AFX_DATA_INIT(CCaptureDlg) h{xq  
  m_bControl = FALSE; 8v{0=9,Z  
  m_bAlt = FALSE; 'PO+P~|oa&  
  m_bShift = FALSE; }4$k-,1S  
  m_Path = _T("c:\\"); 'Cr2& dy  
  m_Number = _T("0 picture captured."); Bs?B\k=  
  nCount=0; eKpWFP 0  
  bRegistered=FALSE; i&K-|[3{g  
  bTray=FALSE; 4~8!3JH39  
 //}}AFX_DATA_INIT Dk ^,iY(u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ||p>O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ''p7!V?  
} prypo.RI  
4Ny lc.2mi  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6KH&-ffd  
{ lftT55Tki  
 CDialog::DoDataExchange(pDX); }N^3P0XjYq  
 //{{AFX_DATA_MAP(CCaptureDlg) 3lh^maQ]  
  DDX_Control(pDX, IDC_KEY, m_Key); ~)fd+~4L  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "UM*(&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 8PRKSJ[@K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (~k{aO  
  DDX_Text(pDX, IDC_PATH, m_Path); |$^a"Yd`9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); BYuoeN!  
 //}}AFX_DATA_MAP {OIktG2gZ  
} {tKi8O^Rb  
%[l#S*)~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :,8eM{.Q  
//{{AFX_MSG_MAP(CCaptureDlg) g$?kL  
 ON_WM_SYSCOMMAND() Aq]*$s2\G  
 ON_WM_PAINT() @Z+(J:Grm5  
 ON_WM_QUERYDRAGICON() [D$% LRX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w^EUBRI-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zn+5pn&?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rl__3q  
//}}AFX_MSG_MAP ;o#wK>pk%M  
END_MESSAGE_MAP() ~;AJB  
v)c[-:"z  
BOOL CCaptureDlg::OnInitDialog() ]y kMh  
{ =w,cdU*  
 CDialog::OnInitDialog(); KtMD?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +$CO  
 ASSERT(IDM_ABOUTBOX < 0xF000); #Y_v0.N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &YpWfY&V  
 if (pSysMenu != NULL) +M s`C)f  
 { }L|cg2y  
  CString strAboutMenu; 7g%.:H =  
  strAboutMenu.LoadString(IDS_ABOUTBOX); PSB@yV <  
  if (!strAboutMenu.IsEmpty()) =@\Li)Y  
  { nqv#?>Z^OT  
   pSysMenu->AppendMenu(MF_SEPARATOR); (?ofL|Cg(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e$Npo<u  
  } vyhxS.[9  
 } 0}4FwcCr\  
 SetIcon(m_hIcon, TRUE); // Set big icon 9zKbzT]  
 SetIcon(m_hIcon, FALSE); // Set small icon [g Y.h/  
 m_Key.SetCurSel(0); 4*9WxhJ ]0  
 RegisterHotkey(); 6 _n~E e  
 CMenu* pMenu=GetSystemMenu(FALSE); b!l/O2 G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Jc9BZ`~i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3:B4;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _/pdZM,V  
 return TRUE; // return TRUE unless you set the focus to a control %YLyh?J  
} u.!<)VIJx  
8]2j*e0xV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^`f( Pg!  
{ d@QC[$qXj  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |]=s  
 { ,\CG}-v@CN  
  CAboutDlg dlgAbout; ( L ]C  
  dlgAbout.DoModal(); )BX-Y@fpA  
 } uzO3_.4Y  
 else  ~=Q|EhF5  
 { p}K\rpvJpu  
  CDialog::OnSysCommand(nID, lParam); $ 0Up.  
 } s9 .nU  
} <x->.R_  
P$hmDTn72  
void CCaptureDlg::OnPaint() <&87aDYz  
{ r$/.x6g//  
 if (IsIconic()) R1j)0b6cQ%  
 { R2B0?fu  
  CPaintDC dc(this); // device context for painting ptCAtEO72  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;Y@"!\t}  
  // Center icon in client rectangle zKf.jpF^  
  int cxIcon = GetSystemMetrics(SM_CXICON); D  Kng.P  
  int cyIcon = GetSystemMetrics(SM_CYICON); B`;DAsmT  
  CRect rect; _ ATIV  
  GetClientRect(&rect); ?5Ub&{  
  int x = (rect.Width() - cxIcon + 1) / 2; c&>==pI]k  
  int y = (rect.Height() - cyIcon + 1) / 2; >XomjU[srQ  
  // Draw the icon V+MhS3VD  
  dc.DrawIcon(x, y, m_hIcon); 1}DUe. a  
 } >G<.^~o  
 else ,].S~6IM  
 { ANWUo}j  
  CDialog::OnPaint(); f^D4aEU  
 } C+<z ;9`  
} >^V3Z{;  
+f]\>{o4  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7nOn^f D  
{ ;=oGg%@aP  
 return (HCURSOR) m_hIcon; KRN{Ath.  
} 2Hj;o  
<Q%:c4N  
void CCaptureDlg::OnCancel() ?[~)D}] j  
{ x}*Y =Xh  
 if(bTray) vo3[)BDbT  
  DeleteIcon(); v:w $l{7  
  CDialog::OnCancel(); =^D{ZZw{  
} oEuo@\U05v  
B'` jdyaE9  
void CCaptureDlg::OnAbout() /ar/4\b  
{ qW(_0<E  
 CAboutDlg dlg; wG2-,\:  
 dlg.DoModal(); /c9%|<O%  
} 1WbawiG}  
J"W+9sI0  
void CCaptureDlg::OnBrowse() @[] A&)B  
{ cc|"^-j-7  
 CString str; G ?&T0  
 BROWSEINFO bi; e)x;3r"j  
 char name[MAX_PATH]; *iW$>Yjb  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); M!E#T-)  
 bi.hwndOwner=GetSafeHwnd(); |Je+y;P7  
 bi.pszDisplayName=name; M_monj}Z  
 bi.lpszTitle="Select folder"; },'Ij; %%Q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; sxBRg=  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hz] p]  
 if(idl==NULL) DJ#z0)3<p  
  return; nM,5KHU4a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [AHZOA   
 str.ReleaseBuffer(); i <%  
 m_Path=str; I-`qo7dQ_S  
 if(str.GetAt(str.GetLength()-1)!='\\') eS{ xma  
  m_Path+="\\"; NA`EG,2  
 UpdateData(FALSE); 68v59)0U  
} c6NCy s  
raPUx_$PH  
void CCaptureDlg::SaveBmp() 9&t!U+  
{ ;"@FLq(n  
 CDC dc; _U@;Z*(%vh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >=Z@)PAe  
 CBitmap bm; l .wf= /  
 int Width=GetSystemMetrics(SM_CXSCREEN); >X(,(mKi  
 int Height=GetSystemMetrics(SM_CYSCREEN); RZ:i60  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d{LQr}_o$$  
 CDC tdc; rH<iUiA?O  
 tdc.CreateCompatibleDC(&dc); `Wf)qMb  
 CBitmap*pOld=tdc.SelectObject(&bm); Nu%JI6&R  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 95G*i;E  
 tdc.SelectObject(pOld); 9ywPWT[^  
 BITMAP btm; G$buZspL'd  
 bm.GetBitmap(&btm); 389puDjy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `*1059   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =>7\s}QZ  
 BITMAPINFOHEADER bih; XS'0fq a  
 bih.biBitCount=btm.bmBitsPixel; G2x5%`   
 bih.biClrImportant=0; 6c/Tm0[  
 bih.biClrUsed=0; L'JEkji"  
 bih.biCompression=0; 7v~\c%1V  
 bih.biHeight=btm.bmHeight; F ;m1I+;  
 bih.biPlanes=1; Jc#()4  
 bih.biSize=sizeof(BITMAPINFOHEADER); G*f5B  
 bih.biSizeImage=size; 2 #+g4  
 bih.biWidth=btm.bmWidth; VK)K#!O8  
 bih.biXPelsPerMeter=0; K)!?np{km  
 bih.biYPelsPerMeter=0; #^bkM)pc  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [@qUQ,Ie  
 static int filecount=0; bh8IF,@a  
 CString name; Dl#%tYL+3h  
 name.Format("pict%04d.bmp",filecount++); w C0fPPeA  
 name=m_Path+name; B !hrr  
 BITMAPFILEHEADER bfh; |Gw[vY  
 bfh.bfReserved1=bfh.bfReserved2=0; /?; 8F  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _S(]/d(c  
 bfh.bfSize=54+size; 5[Ryc[  
 bfh.bfOffBits=54;  uT}Jw  
 CFile bf; <p'~$vK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E!4Qc+.   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "5-S:+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \sIRV}Tk}N  
  bf.WriteHuge(lpData,size); Cz\(.MWNZ  
  bf.Close(); $UZ4,S?V  
  nCount++; 35;)O -  
 } BHwQB2t gc  
 GlobalFreePtr(lpData); "}bk *2  
 if(nCount==1) at/v.U |F  
  m_Number.Format("%d picture captured.",nCount); <N%8"o  
 else \Mv8pU  
  m_Number.Format("%d pictures captured.",nCount); ;n*N9-|.  
  UpdateData(FALSE); O/IW.t  
} qO<'_7TN[  
xy% lp{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ua['rOnU  
{ dQ8}mH!  
 if(pMsg -> message == WM_KEYDOWN) {.N" 6P  
 { #lax0IYY=  
  if(pMsg -> wParam == VK_ESCAPE) #zcp!WE.OI  
   return TRUE; <%JRZYZ  
  if(pMsg -> wParam == VK_RETURN) W?"Z>tgp  
   return TRUE; yD`{9'L -  
 } F6T@YSP  
 return CDialog::PreTranslateMessage(pMsg); bp6 La`+  
} $a6&OH/  
vpY|S2w)Bp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :\*hAV1i  
{ [FKmZzEy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t Ib?23K0  
  SaveBmp(); T[=XGAJ  
  return FALSE; _9Kdcoh  
} hnM|=[wM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^c1I'9(r5  
 CMenu pop; #ZIV>(Q\H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [Bp[=\  
 CMenu*pMenu=pop.GetSubMenu(0); t%Z_*mIfmE  
 pMenu->SetDefaultItem(ID_EXITICON); :&dY1.<N+  
 CPoint pt; [?BmW {*u.  
 GetCursorPos(&pt); 2I:vie  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^sq3@*hCw  
 if(id==ID_EXITICON) Kg>+5~+E?q  
  DeleteIcon(); L_jwM ^8  
 else if(id==ID_EXIT) _Bh-*l?K>  
  OnCancel(); o(~>a  
 return FALSE; piO+K!C0n:  
} `X]-blHo  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); F'Fc)9qFa<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WjGv%^?  
 AddIcon(); J%xp1/= 2  
 return res; M6!kn~  
} ~aH*ZA*f  
5/mW:G,&  
void CCaptureDlg::AddIcon() qkv.,z"  
{ B[-%A!3 F  
 NOTIFYICONDATA data; )F<<M+q=  
 data.cbSize=sizeof(NOTIFYICONDATA); g?(Z+w4A 3  
 CString tip; 5JI+42S \  
 tip.LoadString(IDS_ICONTIP); BoP%f '0N  
 data.hIcon=GetIcon(0); `NV =2T  
 data.hWnd=GetSafeHwnd(); <P( K,L?r  
 strcpy(data.szTip,tip); LaJc;Jt$  
 data.uCallbackMessage=IDM_SHELL; G`w,$:,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -nO('(t  
 data.uID=98; uavts9v<  
 Shell_NotifyIcon(NIM_ADD,&data); 7(~^6Ql!  
 ShowWindow(SW_HIDE); 96vv85g  
 bTray=TRUE; 3OFv_<6  
} 7 .+kcqX  
S'Q$N-Dy  
void CCaptureDlg::DeleteIcon() Y_%\kM?7  
{ AY0o0\6cw  
 NOTIFYICONDATA data; f9JD_hhP'  
 data.cbSize=sizeof(NOTIFYICONDATA); s.KJYP  
 data.hWnd=GetSafeHwnd(); ]&VD$Z984r  
 data.uID=98; U%_a@&<  
 Shell_NotifyIcon(NIM_DELETE,&data); I~"-  
 ShowWindow(SW_SHOW); \,JRNL&   
 SetForegroundWindow(); /Os)4yH\  
 ShowWindow(SW_SHOWNORMAL); s Xl7  
 bTray=FALSE; 8pDJz_F!{  
} .'"+CKD.N  
^F`FB..:y  
void CCaptureDlg::OnChange() 4ej$)AdW3  
{ Qoq@=|7kxa  
 RegisterHotkey(); 7 m&M(ct  
} a|5GC pp  
WLNkO^zb  
BOOL CCaptureDlg::RegisterHotkey() +zs;>'Sf  
{ <g,k[  
 UpdateData(); O(/K@e  
 UCHAR mask=0; 1WcT>_$  
 UCHAR key=0; J~<:yBup}  
 if(m_bControl) 4pq>R  
  mask|=4; ?Dm!;Z+7  
 if(m_bAlt) H:9( XW  
  mask|=2; )R ,*  
 if(m_bShift) %<DRrKt  
  mask|=1; Z#>k:v  
  key=Key_Table[m_Key.GetCurSel()]; AGCqJ8`|T  
 if(bRegistered){ % C6 H(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); sNX$ =<E  
  bRegistered=FALSE; R,Tw0@{O*  
 }  G!O D7:  
 cMask=mask; )KBv[|  
 cKey=key; FNmIXpAn*@  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <`| }bt  
 return bRegistered; ,[Cl'B  
} [b;Oalw  
Ylt[Ks<2  
  四、小结 %F&j B  
fb`VYD9[^  
  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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