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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: iI _Fbw8  
  WIhf*LF"  
  一、实现方法 ?Dfgyz  
*X)OdU  
  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: B)c.`cfr*\  
h.8J6;36  
#pragma data_seg("shareddata") G[wa,j^hu  
HHOOK hHook =NULL; //钩子句柄 !WIL|\jbh  
UINT nHookCount =0; //挂接的程序数目 ]IoS-)$Z/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .lE"N1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 QP qa\87  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Y${ $7+@  
static int KeyCount =0; *F9uv)[kz  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [` i;gx[^  
#pragma data_seg() [}VEDx  
00 $W>Gr  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 -MU^%t;-  
`rM-b'D  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: vu*08<M~i|  
WM"I r1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR DLz~$TF^  
cKey,UCHAR cMask) w.V8-9{  
{ 8 {QvB"w  
 BOOL bAdded=FALSE; =6%0pu]0  
 for(int index=0;index<MAX_KEY;index++){ c5]1aFKz  
  if(hCallWnd[index]==0){ PVvG  
   hCallWnd[index]=hWnd; 7zNyH(.  
   HotKey[index]=cKey; @ 8SYV}0H  
   HotKeyMask[index]=cMask; x2nNkd0h  
   bAdded=TRUE; 1ITa6vjS  
   KeyCount++; _ Fer-nQ2R  
   break; a u#IA  
  } %f>V\z_C  
 } hio{: (  
 return bAdded;  %RJW@~!  
} 6x.#K9@q4  
//删除热键 <CH7jbK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L1J"_.=P  
{ LUCpZ3F1  
 BOOL bRemoved=FALSE; :0vNg:u+  
 for(int index=0;index<MAX_KEY;index++){ . Bv;Zv  
  if(hCallWnd[index]==hWnd){ 3<'n>'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |w:\fK[  
    hCallWnd[index]=NULL; D!y Cnq=8  
    HotKey[index]=0; rv\<Q-uQ8  
    HotKeyMask[index]=0; <vPIC G)  
    bRemoved=TRUE; i|2Q}$3t2  
    KeyCount--; YoahqXR`  
    break; ` bg{\ .q  
   } 9BF #R<}h  
  } ~xA' -N/  
 } '\\J95*`  
 return bRemoved; 0Uybh.dC  
} ty "k  
g~`UC  
Qn6&M  
  DLL中的钩子函数如下: x2 tx{Z  
sbG3,'i)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~s !+9\Fi  
{ \=nY&Ml  
 BOOL bProcessed=FALSE; *VD-c  
 if(HC_ACTION==nCode) ./[t'dgC  
 { z5Po,@W  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C:H9C  
   switch(wParam) B!9<c9/ P]  
   {  dhV =;'   
    case VK_MENU: fUE jl  
     MaskBits&=~ALTBIT; 2!l)% F`  
     break; /#.6IV(  
    case VK_CONTROL: &"25a[x{B  
     MaskBits&=~CTRLBIT; tcmG>^YM  
     break; {@({po  
    case VK_SHIFT: 0;]tC\D1  
     MaskBits&=~SHIFTBIT; eH75: `  
     break; z m_mLk$4H  
    default: //judge the key and send message `L0}^ |`9  
     break; }yXa1#3  
   } k(V#{ YP  
   for(int index=0;index<MAX_KEY;index++){ 8Kv=Zp,?`  
    if(hCallWnd[index]==NULL) .( 75.^b2)  
     continue; 9.>v ;:vL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c7sW:Yzil  
    { T?Hs_u{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P1)9OE  
     bProcessed=TRUE; S_1R]n1/  
    } l'mgjv~  
   } 5a_1x|Fhi  
  } &i6WVNGy  
  else if((lParam&0xc000ffff)==1){ //有键按下 z0doL b^!  
   switch(wParam) Xul<,U~w6  
   { c"6<p5j!  
    case VK_MENU: ,7<5dIdZ  
     MaskBits|=ALTBIT; ~%>ke  
     break; bT0CQ_g21  
    case VK_CONTROL: cgml^k\k^  
     MaskBits|=CTRLBIT; =C u !  
     break; "Bn!<h}mg  
    case VK_SHIFT:  #6@7XC  
     MaskBits|=SHIFTBIT; >e'6RZRLA  
     break; l2._Z Py  
    default: //judge the key and send message mD=x3d  
     break; w {6kU   
   } O cd ^{u  
   for(int index=0;index<MAX_KEY;index++){ #2/k^N4r  
    if(hCallWnd[index]==NULL) uq{w1O5  
     continue; 1 1O^)_|c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -NHc~=m  
    { <`n T+c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [gx6e 44  
     bProcessed=TRUE; wxN'Lv=R  
    } t4~Bn<=  
   } m.Yj{u8zX  
  } &n91f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 A^*0{F?,)  
   for(int index=0;index<MAX_KEY;index++){ &Z#g/Hc  
    if(hCallWnd[index]==NULL) 4f'1g1@$  
     continue; 'z>|N{-xG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8<{)|GoqB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]u G9WT6l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 bw&8"k>D?  
   } `[X5mEe  
  } Fzt{^%\`  
 } lN -vFna  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <$qe2Ft Uq  
} A )tGB&  
1 cvoI  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: J7c(qGJI2  
.T#h5[S2x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9jBP|I{xI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0X !A'  
|eU{cK~e^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: au1uFu-  
*@^9 ]$*$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L9W'TvTwo  
{ 4|ML#aRz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _H} 8eU  
 { P uYAoKG  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $~W =)f9  
  SaveBmp(); WzDL(~m+Z  
  return FALSE; #R-l2OO^]  
 } A]c'`Nf  
 …… //其它处理及默认处理 @FO= 0_;y  
} )O;6S$z9Y  
 vtk0 j  
.hPk}B/KV  
  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。 suiO%H^t  
t<h[Lb%{T4  
  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。 {DlQTgP  
Qqm'Yom%T  
  二、编程步骤 rom`%qp^  
+#ufW%ZG  
  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"; "MM)AY*b  
_c$l@8KS^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !8~A`  
AAuH}W>n  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 0wQ'~8  
+&bJhX  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; m~c6b{F3Z-  
L6<.>\^Z"  
  5、 添加代码,编译运行程序。 N hG?@N  
v,, .2UR4  
三、程序代码 ||yx?q6\h  
%dn!$[D@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K@U[x,Sx  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) uW;[FTcqy$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ > oh7f|  
#if _MSC_VER > 1000 &UrPb%=2H  
#pragma once %La<]  
#endif // _MSC_VER > 1000 :O)\+s-  
#ifndef __AFXWIN_H__ tx`gXtO$  
#error include 'stdafx.h' before including this file for PCH Wz{,N07Q#{  
#endif "}*5'e.*  
#include "resource.h" // main symbols u]0{#wu;g  
class CHookApp : public CWinApp F)K&a  
{ #w]UP#^io  
 public: &"l Sq2  
  CHookApp(); kZ5;Fe\*  
  // Overrides <<WqL?8W  
  // ClassWizard generated virtual function overrides fj"1TtPq#  
  //{{AFX_VIRTUAL(CHookApp) V) xwlvX  
 public: }IJE%  
  virtual BOOL InitInstance(); C}jFR] x)  
  virtual int ExitInstance(); pz4lC=H%o  
  //}}AFX_VIRTUAL :#nfdvqm  
  //{{AFX_MSG(CHookApp) $Iz*W]B!  
  // NOTE - the ClassWizard will add and remove member functions here. VcX89c4\  
  // DO NOT EDIT what you see in these blocks of generated code ! 'Hf+Y/`  
  //}}AFX_MSG <DR$WsDG  
  DECLARE_MESSAGE_MAP() fbg:rH\_  
}; TF_wT28AU2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7! sR%h5p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QzLE9   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s$g3__|Y  
BOOL InitHotkey(); 80_}}op ?8  
BOOL UnInit(); E5iNuJj=f  
#endif 1L;3e@G  
.o#A(3&n  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _|jEuif  
#include "stdafx.h" yRAfIB$T}"  
#include "hook.h" @js`$  
#include <windowsx.h> I_k/lwBD  
#ifdef _DEBUG 2p %j@O  
#define new DEBUG_NEW \JLea$TM:  
#undef THIS_FILE _9f7@@b  
static char THIS_FILE[] = __FILE__; yOTC>?p%  
#endif TGDrTyI?y  
#define MAX_KEY 100 3-Bz5sj9  
#define CTRLBIT 0x04 A'6-E{  
#define ALTBIT 0x02 /$NR@56 \  
#define SHIFTBIT 0x01 HkPdqNC&  
#pragma data_seg("shareddata") 9ERyr1-u v  
HHOOK hHook =NULL; &v)/mc7D  
UINT nHookCount =0; u~8=ik n+T  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %p;;aZG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT slnvrel  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey B%n|%g6K|h  
static int KeyCount =0; B=}s7$^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ZyX+V?4  
#pragma data_seg() xp*Wf#BF  
HINSTANCE hins; A1Es>NK[qW  
void VerifyWindow(); 2`^M OGYk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !&adO,jN+=  
//{{AFX_MSG_MAP(CHookApp) %`bn=~T^  
// NOTE - the ClassWizard will add and remove mapping macros here. +v+Dkyf:V  
// DO NOT EDIT what you see in these blocks of generated code! )tm%0z7R  
//}}AFX_MSG_MAP JA09 o(  
END_MESSAGE_MAP() 719lfI&s  
Ua.%?V  
CHookApp::CHookApp() Vd;N T$S$  
{ bn:74,GeyK  
 // TODO: add construction code here, U<|*V5   
 // Place all significant initialization in InitInstance J?Bj=b  
} cv5+[;(b  
L[voouaqm  
CHookApp theApp; \MDhm,H<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ku)/ 8Z`$  
{ rL,kDSLs  
 BOOL bProcessed=FALSE; MX"M2>"pT  
 if(HC_ACTION==nCode) 8b"vXNB.f  
 { 6 \?GY  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5SEGV|%  
   switch(wParam) 8I~*9MUp  
   { OIs!,G|  
    case VK_MENU: U!jRF  
     MaskBits&=~ALTBIT;  eIj2(q9  
     break; ]+5Y\~I  
    case VK_CONTROL: yu}T><Wst  
     MaskBits&=~CTRLBIT; w~~[0e+E  
     break; 5mX"0a_Q  
    case VK_SHIFT: >~O/ZDu/@  
     MaskBits&=~SHIFTBIT; /%F5u}eW  
     break; 0 s@>e  
    default: //judge the key and send message jZk dTiI  
     break; ?aQVaw&L!7  
   } rRX F@  
   for(int index=0;index<MAX_KEY;index++){ YF(bl1>YC  
    if(hCallWnd[index]==NULL) F?Fxm*Wa/  
     continue; =d$m@rc0r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;EsfHCi)  
    { yu jv^2/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~zoZ{YqP  
     bProcessed=TRUE; S;" $02]  
    } J;k8 a2$_  
   } `j4OKZ  
  } r*c x_**  
  else if((lParam&0xc000ffff)==1){ //Key down =%S*h)}@  
   switch(wParam) Q sPZ dC  
   { -sx=1+\nf  
    case VK_MENU: nTE\EZ+=2  
     MaskBits|=ALTBIT; xUPg~c0  
     break; w&Z.rB?  
    case VK_CONTROL: fskc'%x  
     MaskBits|=CTRLBIT; ^YB3$:@$U  
     break; Ow {NI-^K  
    case VK_SHIFT: /&em%/  
     MaskBits|=SHIFTBIT; O{Z bpa^  
     break; xf;Tk   
    default: //judge the key and send message }}LjEOvL=  
     break; CpU y~  
   } ] V,#>'  
   for(int index=0;index<MAX_KEY;index++) ft$ 'UJ% j  
   { m[%P3  
    if(hCallWnd[index]==NULL) q4niA  
     continue; 8"ulAx74>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M y!;N1  
    { POQ4&ChA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~PX#' Jr  
     bProcessed=TRUE; [M?&JA_$}  
    } 'DUY f5nF  
   } L-|u=c-6  
  } 7-}/{o*,5  
  if(!bProcessed){ o;v_vCLO  
   for(int index=0;index<MAX_KEY;index++){ ~Efi|A/  
    if(hCallWnd[index]==NULL) C}71SlN'M  
     continue; EdCcnl?R6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A<-3u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A/OGF>  
   } -e.ygiK.`S  
  }  -K4uqUp  
 } Lw6}b B`}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -l <[CI  
} FXbalQ?^  
}q)dXFL=I#  
BOOL InitHotkey() r#c+{yY  
{ {;={ abj  
 if(hHook!=NULL){ 85{@&T  
  nHookCount++; 5r^u7k  
  return TRUE; 2SYV2  
 } Cp]q>lM"  
 else G C@U['  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (X|lK.W y  
  if(hHook!=NULL) npcL<$<6X  
   nHookCount++; `o%Ua0x2  
  return (hHook!=NULL); Px`z$~*B:  
} > M4QEv  
BOOL UnInit() e9eBD   
{ ;h4w<OqcM  
 if(nHookCount>1){ Y~ Nt9L  
  nHookCount--; @|}=W Q  
  return TRUE; Ns-3\~QSi  
 } GTW5f  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -l$-\(,M`#  
 if(unhooked==TRUE){ ^%x7:  
  nHookCount=0; jxZd =%7Q  
  hHook=NULL; }#E~XlX^  
 } %loe8yt  
 return unhooked; okD7!)cr=  
} !qJ|`o Y  
#po}Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =mh)b]].4\  
{ 6}q# c  
 BOOL bAdded=FALSE; tSq`_[@  
 for(int index=0;index<MAX_KEY;index++){ I< Rai"  
  if(hCallWnd[index]==0){ WC 5v#*Jd  
   hCallWnd[index]=hWnd; y_Nn%(j  
   HotKey[index]=cKey; +WSM<S2 U  
   HotKeyMask[index]=cMask; #}zL?s^G  
   bAdded=TRUE; {pEbi)CF,}  
   KeyCount++; K[i|OZWu  
   break; nNcmL/(  
  } / Hexv#3  
 } u )KtvC!  
 return bAdded; |79n 1;+\?  
} k&3'[&$I*,  
3EX41)u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \"mL LnK?  
{ oW8 hC  
 BOOL bRemoved=FALSE; 9h'klaE(  
 for(int index=0;index<MAX_KEY;index++){ fu7J{-<<R  
  if(hCallWnd[index]==hWnd){ 0V?:5r<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -_~T;cj6  
    hCallWnd[index]=NULL; t 5  
    HotKey[index]=0; #'Lt_Yf!  
    HotKeyMask[index]=0; =]F15:%Z q  
    bRemoved=TRUE; wvNddu>@  
    KeyCount--; =j!Ruy1  
    break; .{LJ  
   } LxxFosi8  
  } Fd@:*ER  
 } ){XG%nC  
 return bRemoved; JheF}/Bx  
} "K-2y ^Dl  
V7i1BR8G  
void VerifyWindow() |.[4$C  
{ #[ hJm'G  
 for(int i=0;i<MAX_KEY;i++){ 0Xw3h^%  
  if(hCallWnd!=NULL){ $5a%hK  
   if(!IsWindow(hCallWnd)){ 7eekTh, ?  
    hCallWnd=NULL; U^{'"x+  
    HotKey=0; -( +/u .  
    HotKeyMask=0; @~`2L o/  
    KeyCount--; QyX ?  
   } Kly`V]XE  
  } &d^u$Y5  
 } m8njP-CZ  
} W]DZ'  
IMay`us]:8  
BOOL CHookApp::InitInstance() '74-rL:i  
{ 8k`rj;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ok7yFm1\  
 hins=AfxGetInstanceHandle(); @}@J$ g  
 InitHotkey(); I!sB$=n  
 return CWinApp::InitInstance(); OA3* "d*  
} &GH ,is  
R2$;f?;:  
int CHookApp::ExitInstance() f6Io|CZWJ  
{ 9K5[a^q|My  
 VerifyWindow(); @(H  
 UnInit(); =~~Y@eX  
 return CWinApp::ExitInstance(); G\:^9!nwY~  
} FUj4y 9X  
{^VvL'n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file z`[q$H7?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?Em*yc@WD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GP\Pk/E  
#if _MSC_VER > 1000 -w:F8k ~  
#pragma once 7J@D})si  
#endif // _MSC_VER > 1000 Ii9@ j1-g  
)pA N_e"  
class CCaptureDlg : public CDialog yPqZ ,  
{ 9@."Y>1G  
 // Construction +aWI"d--h  
 public: uk~4R@=&H  
  BOOL bTray; &18CCp\3)c  
  BOOL bRegistered; idr,s\$>  
  BOOL RegisterHotkey(); + B#3!  
  UCHAR cKey; @fWmz,Ngl  
  UCHAR cMask; UR&Uwa&.  
  void DeleteIcon(); S@a#,,\[  
  void AddIcon(); 6T5nr  
  UINT nCount; Cq,ox'kGl  
  void SaveBmp(); YdK]%%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor PDnwaK   
  // Dialog Data N3Jfp3_b@  
  //{{AFX_DATA(CCaptureDlg) OyG$ ]C  
  enum { IDD = IDD_CAPTURE_DIALOG }; |NcfR"[c  
  CComboBox m_Key; Y(4#b`k3  
  BOOL m_bControl; D{aN_0mT  
  BOOL m_bAlt; IP`;hC  
  BOOL m_bShift; `_6!nk q8  
  CString m_Path; jtk2>Ol   
  CString m_Number; G,8LF/sR  
  //}}AFX_DATA Jyx6{O j  
  // ClassWizard generated virtual function overrides / ` 7p'i  
  //{{AFX_VIRTUAL(CCaptureDlg) ,afh]#  
 public: yH8 N8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); : qKxm(  
 protected: +Zx+DW cq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O&!tW^ih  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qdB@P  
  //}}AFX_VIRTUAL ':fq  
  // Implementation &Oq& ikw  
 protected: MT,LO<.  
  HICON m_hIcon; /2&jId  
  // Generated message map functions KbY5 qou  
  //{{AFX_MSG(CCaptureDlg) K>TdN+Z}=  
  virtual BOOL OnInitDialog(); UpgY}pf}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #`C ;@#xr  
  afx_msg void OnPaint();  @t  
  afx_msg HCURSOR OnQueryDragIcon(); DdTTWp/  
  virtual void OnCancel(); lbv9 kk[  
  afx_msg void OnAbout(); Y) >GwFK$  
  afx_msg void OnBrowse(); l("Dw8 H  
  afx_msg void OnChange(); )j40hrR  
 //}}AFX_MSG r`|/qP:T[  
 DECLARE_MESSAGE_MAP() vnXa4\Vdy  
}; PX3rHKK {  
#endif K YFumR  
*sqq]uD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .Z}ySd:X  
#include "stdafx.h" h'x|yy]@3  
#include "Capture.h" Ch`XwLY9  
#include "CaptureDlg.h" \k1psqw^O  
#include <windowsx.h> "qRE1j@%a  
#pragma comment(lib,"hook.lib") $-$^r;  
#ifdef _DEBUG oXg KuR  
#define new DEBUG_NEW 32=Gq5pOc  
#undef THIS_FILE %v\0Dm+A  
static char THIS_FILE[] = __FILE__; )k0P' zGb  
#endif *f:^6h  
#define IDM_SHELL WM_USER+1 bmotR8d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &UUIiQm~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &j,rq?eh$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F7`3,SzHp  
class CAboutDlg : public CDialog #;Y JR9VN  
{ <JKRdIx&1  
 public: adh=Kp e!w  
  CAboutDlg(); /a\6&Eb  
  // Dialog Data yAoJ?<4^W  
  //{{AFX_DATA(CAboutDlg) :luVsQ  
  enum { IDD = IDD_ABOUTBOX }; h5&l#>8&  
  //}}AFX_DATA LoLmT7  
  // ClassWizard generated virtual function overrides 8oG0tX3i  
  //{{AFX_VIRTUAL(CAboutDlg) 0l6z!@GhT  
 protected: -DrR6kGjR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %_wX9Z T  
  //}}AFX_VIRTUAL 2l#Ogn`k  
  // Implementation @X_x?N  
 protected: 2*-s3 >VK  
  //{{AFX_MSG(CAboutDlg) |A0LYKni  
  //}}AFX_MSG %0}qMYS  
  DECLARE_MESSAGE_MAP() 1Fn+nDn O6  
}; NaSgK  
|b{XnD_g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Au$|@  
{ Ql> DS~a  
 //{{AFX_DATA_INIT(CAboutDlg) bR@ e6.<i  
 //}}AFX_DATA_INIT {Q[{H'Oa  
} ^WP`;e  
FFl[[(`%D  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _|xO4{X  
{ "P=OpFV  
 CDialog::DoDataExchange(pDX); + ?n81|7`  
 //{{AFX_DATA_MAP(CAboutDlg) A1:<-TF6^p  
 //}}AFX_DATA_MAP etj8M y6=  
} \X5{>nNh  
bort2k  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jQzq(oDQw  
 //{{AFX_MSG_MAP(CAboutDlg) ua*k{0[  
 // No message handlers AoL4#.r3H  
 //}}AFX_MSG_MAP [Z|R-{"  
END_MESSAGE_MAP() V2cLwQ'0  
s)#FqB8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &IM;Yl  
: CDialog(CCaptureDlg::IDD, pParent) (Bd8@}\u_  
{ mc;Z#"kf  
 //{{AFX_DATA_INIT(CCaptureDlg) - *!R  
  m_bControl = FALSE; y~An'+yBa  
  m_bAlt = FALSE; 9D:p~_"g  
  m_bShift = FALSE; }<o.VY&;.  
  m_Path = _T("c:\\"); [k.|iCD  
  m_Number = _T("0 picture captured."); S,Boutd  
  nCount=0; " 4#V$V  
  bRegistered=FALSE; Yjv}@i"  
  bTray=FALSE; ./LD  
 //}}AFX_DATA_INIT >tnQuFKg]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zRdL-u%(#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); );V6YE  
} TU{^/-l  
Y  9]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) D)XF@z;  
{ o ^L 3Xiv  
 CDialog::DoDataExchange(pDX); XP<wHh  
 //{{AFX_DATA_MAP(CCaptureDlg) G=!1P]M{  
  DDX_Control(pDX, IDC_KEY, m_Key); bB'iK4  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); s@K)RhTY  
  DDX_Check(pDX, IDC_ALT, m_bAlt); C3Q[L}X\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *z;4. OX  
  DDX_Text(pDX, IDC_PATH, m_Path); _Iy0-=G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); NARW3\  
 //}}AFX_DATA_MAP tvynl;Y/  
} b[Sd$ACd  
j2SJ4tB /  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a:Js i=  
//{{AFX_MSG_MAP(CCaptureDlg) oCdWf63D  
 ON_WM_SYSCOMMAND() $Zp\^cIE+  
 ON_WM_PAINT() tM]~^U  
 ON_WM_QUERYDRAGICON() u HqPb8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) cq+|fg~Yy  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xal+ buOiP  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k'{'6JR  
//}}AFX_MSG_MAP .ml24SeC  
END_MESSAGE_MAP() fEE[h uG  
DcA{E8Y  
BOOL CCaptureDlg::OnInitDialog() *,X;4?:,  
{ jIwz G+)$P  
 CDialog::OnInitDialog(); }YWLXxb;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?Z= %I$i  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7J,j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I}Uj"m`>  
 if (pSysMenu != NULL) ED&>~~k)  
 { SYRr|Lg  
  CString strAboutMenu; Ql^I$5&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); FuiG=quY  
  if (!strAboutMenu.IsEmpty()) Hj't.lg+j  
  { wl H6  
   pSysMenu->AppendMenu(MF_SEPARATOR); Meo(|U  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Fg<$;p  
  } p'fq&a+  
 } M_*"g>Z  
 SetIcon(m_hIcon, TRUE); // Set big icon <7R\ #  
 SetIcon(m_hIcon, FALSE); // Set small icon A ><  
 m_Key.SetCurSel(0); u8L%R[#o  
 RegisterHotkey(); P2pdXNV  
 CMenu* pMenu=GetSystemMenu(FALSE); hRTw8-wy:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); w%R(*,r6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); J7q^4M+o:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @igr~hJ  
 return TRUE; // return TRUE unless you set the focus to a control .Nz2K[  
} S0\QZ/je  
^.)oQo SE  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F8mS5oB|^  
{ p;cNmMm  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :,%~R2  
 { $(B|$e^:(  
  CAboutDlg dlgAbout; ^N#B( F  
  dlgAbout.DoModal(); \=PnC}7I  
 } } M-^A{C\%  
 else #'[4k:  
 { =aZgq99  
  CDialog::OnSysCommand(nID, lParam); N,fEta6  
 } X c~yr\%]  
} jsB%RvX  
=n .d'  
void CCaptureDlg::OnPaint() w%F~4|F  
{ <]<P<  
 if (IsIconic()) ^k6 A,Ak  
 { nR'!Ui  
  CPaintDC dc(this); // device context for painting f Ne9as  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .anXsjD%W  
  // Center icon in client rectangle zLEl/yPE  
  int cxIcon = GetSystemMetrics(SM_CXICON); r(WR=D{  
  int cyIcon = GetSystemMetrics(SM_CYICON); tb36c<U-  
  CRect rect; \6A Yx[|  
  GetClientRect(&rect); hB/4.K]8  
  int x = (rect.Width() - cxIcon + 1) / 2; a!rU+hiC  
  int y = (rect.Height() - cyIcon + 1) / 2; __N< B5E  
  // Draw the icon VbX+`CwH  
  dc.DrawIcon(x, y, m_hIcon); 2GeJ\1k  
 } art L  
 else L kYcAY$w  
 { Ug(;\*yg  
  CDialog::OnPaint(); A)6xEeyR  
 } Aiyx!Q6vT  
} L~9Q7 6w  
5hN)y-4@  
HCURSOR CCaptureDlg::OnQueryDragIcon() [Z~h!}  
{ &[71~.Od  
 return (HCURSOR) m_hIcon; K|[p4*6  
} D>tex/Of3  
"LZQ1P*ef$  
void CCaptureDlg::OnCancel() Bv-|#sdxm  
{ I!sh+e  
 if(bTray) } )D E  
  DeleteIcon(); UF37|+"E  
  CDialog::OnCancel(); b7-M'-Km0_  
}  ;;>hWAS  
oA/[>\y  
void CCaptureDlg::OnAbout() LFvO[&  
{ v'3.`aZ!  
 CAboutDlg dlg; u}_,4J  
 dlg.DoModal(); })#VO-J  
} T($d3Nn1  
uBpnfIe  
void CCaptureDlg::OnBrowse() @ ;T|`Y=7  
{ b0X<)1O  
 CString str; b;Nm$`2  
 BROWSEINFO bi; E3..$x-/  
 char name[MAX_PATH]; M9[52D!{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P;~`%,+S  
 bi.hwndOwner=GetSafeHwnd(); ?X $#J'U;  
 bi.pszDisplayName=name; l$[7 pM[  
 bi.lpszTitle="Select folder"; lL8pIcQW  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; rK` x<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ZVu_E.4.  
 if(idl==NULL) QjT$.pU d  
  return; f6/<lSoW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); BQWhTS7  
 str.ReleaseBuffer(); yV"k:_O{  
 m_Path=str; d `MTc  
 if(str.GetAt(str.GetLength()-1)!='\\') J!{"^^*  
  m_Path+="\\"; GgT 5'e;N  
 UpdateData(FALSE); +lYo5\1=  
} '%Fg+cZN\  
t+9[ki  
void CCaptureDlg::SaveBmp() -d-vzri  
{ ~,Y xUn8@  
 CDC dc; Fw{:fFZC[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); h@kq>no  
 CBitmap bm; WZ@hP'Zc  
 int Width=GetSystemMetrics(SM_CXSCREEN); I1f4u6\*X  
 int Height=GetSystemMetrics(SM_CYSCREEN); zv%]j0 ?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]S  
 CDC tdc; gm^j8  B  
 tdc.CreateCompatibleDC(&dc); 6DkFIkS  
 CBitmap*pOld=tdc.SelectObject(&bm); "FD`1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \p4>onGI  
 tdc.SelectObject(pOld); =Ff _)k  
 BITMAP btm; ZYS`M?Au  
 bm.GetBitmap(&btm); zG\& ZU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bwR$9 10b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7];AB;0"  
 BITMAPINFOHEADER bih; e:9s%|]T  
 bih.biBitCount=btm.bmBitsPixel; ^uiQZ%;  
 bih.biClrImportant=0; P^3`znq{  
 bih.biClrUsed=0; H|\@[:A+  
 bih.biCompression=0; F o k%  
 bih.biHeight=btm.bmHeight; 1  b&<De  
 bih.biPlanes=1; @5RbMf{  
 bih.biSize=sizeof(BITMAPINFOHEADER); :?!b\LJ2^  
 bih.biSizeImage=size; ?d!*[Ke8  
 bih.biWidth=btm.bmWidth; ?2(5 2?cJ  
 bih.biXPelsPerMeter=0; !+FrU'^  
 bih.biYPelsPerMeter=0; Q6 oM$qiM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Tv[h2_+E  
 static int filecount=0; a Fh9B\n  
 CString name; 8(zE^W,[8"  
 name.Format("pict%04d.bmp",filecount++); zi^?9n),  
 name=m_Path+name; !-veL1r  
 BITMAPFILEHEADER bfh; @D[tljc^  
 bfh.bfReserved1=bfh.bfReserved2=0; v:F_! Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); *SK`&V  
 bfh.bfSize=54+size; $,.XPK5Q u  
 bfh.bfOffBits=54; ]Y3NmL  
 CFile bf; 11^.oa+`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ IRknD3LX  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); u~xfI[8C  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;!hwcOkX  
  bf.WriteHuge(lpData,size); {{r.?m#{  
  bf.Close(); &wa2MNCG8  
  nCount++; ,*kh{lJ  
 } tE8aL{<R  
 GlobalFreePtr(lpData); ]5O]=^ u0  
 if(nCount==1) Zxw cqN  
  m_Number.Format("%d picture captured.",nCount); @=ro/.  
 else +$YH dgZ.  
  m_Number.Format("%d pictures captured.",nCount); 7gc?7TM  
  UpdateData(FALSE); 5i@WBa  
} %y{'p:  
Q2>o+G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Nov)'2g7G  
{ Cut7  
 if(pMsg -> message == WM_KEYDOWN) \1He9~6  
 { #b eLo J  
  if(pMsg -> wParam == VK_ESCAPE) <dGph  
   return TRUE; OWys`2W  
  if(pMsg -> wParam == VK_RETURN) 'NNfzh  
   return TRUE; yU"lJ>Eh}}  
 } uXouN$&  
 return CDialog::PreTranslateMessage(pMsg); I~ 1Rt+:  
} 4%$#   
GU|(m~,`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) H?_wsh4J  
{ #|"M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (zX75QSKV  
  SaveBmp(); *!.anbo@?z  
  return FALSE; gX|We}H  
} N mA6L+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |{ @BH  
 CMenu pop; ffQm"s:P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :+_  
 CMenu*pMenu=pop.GetSubMenu(0); eakQZ-Q  
 pMenu->SetDefaultItem(ID_EXITICON); r3NdE~OAi  
 CPoint pt; l*w*e.ezQ  
 GetCursorPos(&pt); hLr\;Swyp  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /o^/ J~/3  
 if(id==ID_EXITICON) _+9o'<#u(  
  DeleteIcon(); >} E  
 else if(id==ID_EXIT) G3o`\4p  
  OnCancel(); n5 2Q-6H  
 return FALSE; $jOp:R&I^3  
} r+!29  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); hCb2<_3CR  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  r4M;]  
 AddIcon(); I8/tD|3  
 return res; c2u*<x  
} {G+iobQdd  
/5Sd?pW;  
void CCaptureDlg::AddIcon() []$L"?]0uk  
{  u]OYu  
 NOTIFYICONDATA data; +~V)&6Vn  
 data.cbSize=sizeof(NOTIFYICONDATA); IuY4R0Go  
 CString tip; &^7(?C' u  
 tip.LoadString(IDS_ICONTIP); Qd/x{a8  
 data.hIcon=GetIcon(0); 4" pU\g  
 data.hWnd=GetSafeHwnd(); u` ;P^t5  
 strcpy(data.szTip,tip); FR']Rj  
 data.uCallbackMessage=IDM_SHELL; sp&gw XPG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W]5Hc|!^^  
 data.uID=98; w$Z%RF'p  
 Shell_NotifyIcon(NIM_ADD,&data); (<}BlL   
 ShowWindow(SW_HIDE); L6"V=^Bq  
 bTray=TRUE; kEp{L  
} vSy[lB|)24  
:Y|[?;  
void CCaptureDlg::DeleteIcon() r&+w)U~  
{  [a_o3  
 NOTIFYICONDATA data; :'FCeS9  
 data.cbSize=sizeof(NOTIFYICONDATA); }]Nt:_UCX  
 data.hWnd=GetSafeHwnd(); 3RF`F i  
 data.uID=98; V KxuK0{  
 Shell_NotifyIcon(NIM_DELETE,&data); )nGH$Mu  
 ShowWindow(SW_SHOW); KE6 XNG3  
 SetForegroundWindow(); k;Fxr%  
 ShowWindow(SW_SHOWNORMAL); *L~?.9R  
 bTray=FALSE; nkzH}F=<  
} Qff.QI,  
Yd(<;JKF[  
void CCaptureDlg::OnChange() vY7 @1_"  
{ X}wo$t  
 RegisterHotkey(); 4y.qtiIP>$  
} &smZ;yb|'h  
!4T!@"#  
BOOL CCaptureDlg::RegisterHotkey() m8V}E& 6  
{ Q_Wg4n5  
 UpdateData(); `2/V.REX$h  
 UCHAR mask=0; I_ AFHrj  
 UCHAR key=0; (*_lLM@Cd  
 if(m_bControl) z8XWp[K  
  mask|=4; /I((A /ks  
 if(m_bAlt) yp[,WZt  
  mask|=2; 9o4h~Imu  
 if(m_bShift) "}Ikx tee  
  mask|=1; (I#mo2  
  key=Key_Table[m_Key.GetCurSel()]; BT`g'#O  
 if(bRegistered){ G)q;)n;*=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ia (&$a8X  
  bRegistered=FALSE; :cf#Tpq"  
 } r@}8TE*|P  
 cMask=mask; !L@<?0x LW  
 cKey=key; Bg] %  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ldj*{t `5  
 return bRegistered; xS:n  
} Ss0I{0  
8 C9ny}  
  四、小结 rHi4Pw{L  
`(ik2#B`}  
  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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