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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: ;R7+6  
  eA-$TSWh  
  一、实现方法 +,UuJ6[n  
En ]"^*  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: j`QXl  
 Sr+ &  
#pragma data_seg("shareddata") \RmU6(;IQ  
HHOOK hHook =NULL; //钩子句柄 &W%fsy<  
UINT nHookCount =0; //挂接的程序数目 y$+_9VzYB  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~;@\9oPpz%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 yAQ)/u[|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QeQxz1  
static int KeyCount =0; z'}z4^35,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @+hO,WXN  
#pragma data_seg() ]u47]L#  
&/$3>MD2`  
  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。 .NMZHK?%  
/;WFRp.  
  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: $?y\3GX  
H(DI /"N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gH/(4h  
cKey,UCHAR cMask) OySn[4`(i  
{ e?<$H\  
 BOOL bAdded=FALSE; {4r }jH  
 for(int index=0;index<MAX_KEY;index++){ OQ+kOE&  
  if(hCallWnd[index]==0){ lh-zE5;  
   hCallWnd[index]=hWnd; s:J QV  
   HotKey[index]=cKey; G&@_,y|  
   HotKeyMask[index]=cMask; +oiuulA  
   bAdded=TRUE; R]N"P:wf@  
   KeyCount++; 9,$ n 6t;  
   break; y-_IMu.J`  
  } 4R& pb1eF  
 } B:fulgh2ni  
 return bAdded; +@MG$*}Oz  
} i([|@Y=  
//删除热键 Ur(<  ]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &G_XgQsg{  
{ QxiAC>%K  
 BOOL bRemoved=FALSE; t]+h.  
 for(int index=0;index<MAX_KEY;index++){ vlPViHF.  
  if(hCallWnd[index]==hWnd){ ?zK\!r{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }VqCyJu&{  
    hCallWnd[index]=NULL; `86})xz{  
    HotKey[index]=0; wj\kx\+  
    HotKeyMask[index]=0; @VnK/5opS  
    bRemoved=TRUE; rhC x&L  
    KeyCount--; z`!f'I--!  
    break; 0>yu Bgh  
   } 89ab?H}/  
  } -NUA  
 } wcL|{rUXba  
 return bRemoved; n8o(>?Kw  
} bl[2VM7P  
^F87gow%`B  
G`z=qaj  
  DLL中的钩子函数如下: ' [%?j?2r  
r[3 2'E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Iy@6cd,)S  
{ ap[Q'=A`  
 BOOL bProcessed=FALSE; XyD*V;.E  
 if(HC_ACTION==nCode) Ha~} NO  
 { A5,(P$@ k  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 s[}cj+0  
   switch(wParam) ;& zBNj  
   {  ?;DzWCL~9  
    case VK_MENU: R!2E`^{Wl  
     MaskBits&=~ALTBIT; vpoJ{TPO  
     break; 14yzGhA  
    case VK_CONTROL: _aw49ag;  
     MaskBits&=~CTRLBIT; oI x!?,1  
     break;  5 c1{[  
    case VK_SHIFT: \8]("l}ms8  
     MaskBits&=~SHIFTBIT; +[Q`I*C  
     break; ML7qrc;Rx  
    default: //judge the key and send message K&up1nZ@(  
     break; h%!,|[|  
   } ~/;shs<9EM  
   for(int index=0;index<MAX_KEY;index++){ gCM(h[7A  
    if(hCallWnd[index]==NULL) YRU#/TP  
     continue; _s+_M+@et  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x n}HB  
    { 3H`ES_JL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .|GnTC q  
     bProcessed=TRUE; U8 n=Ro  
    } Ns.{$'ll  
   } rXVR X#Lh  
  } -!X\xA/KN  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ee'wsL  
   switch(wParam) %[fZ@!B  
   { ?A~a}bFZ  
    case VK_MENU: gk4DoOj#P  
     MaskBits|=ALTBIT; .}3K9.hkr  
     break; :CG;:( |  
    case VK_CONTROL: 43N=O FU  
     MaskBits|=CTRLBIT; kV$VKag*A  
     break; ,<fs+oi  
    case VK_SHIFT: #<yKG\X?  
     MaskBits|=SHIFTBIT; jNW/Biy4u  
     break;  S=X_7V  
    default: //judge the key and send message yOyuMZo6  
     break; c6LPqPcN  
   } yS@xyW /  
   for(int index=0;index<MAX_KEY;index++){ H~?p,h  
    if(hCallWnd[index]==NULL) 0yL%Pjn6  
     continue; #w;%{C[D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .>@]Im  
    { xi=Qxgx0I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L%I8no-Q  
     bProcessed=TRUE; p0C|ECH  
    } @<B$LJ|jdG  
   } Zmy:Etqi  
  } L!^^3vn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YH{FTVOt{C  
   for(int index=0;index<MAX_KEY;index++){ 3'[ g2JR  
    if(hCallWnd[index]==NULL) .%_=(C< E  
     continue; :jGgX>GG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TTz_w-68  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [+b&)jN*2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P;ovPyoO  
   } DaqpveKa  
  } @vvGhJ1m`  
 } 89J7hnJC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <Y^)/ s  
} o<7'(Pz  
d? 4-"9Y  
  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: A'T: \Wl  
en29<#8TO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {r1}ACw{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |.LE`  
?xtP\~  
  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: xU'% 6/G  
7DIFJJE'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Mgg m~|9)  
{ <[tU.nh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) S3?U-R^`  
 { 9/6=[)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 I=&Kn@^  
  SaveBmp(); 9l}G{u9a  
  return FALSE; D@yu2}F{IY  
 } YbuS[l8  
 …… //其它处理及默认处理 F^X:5g~K  
} {GS$7n  
P]`m5 N  
 +D|E8sz8  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 -h{|u{t  
>:f&@vwm  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 jU=n\o=?  
aaFt=7(K  
  二、编程步骤 "ac$S9@~  
@fI 2ZWN|  
  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"; %Su,  
$'Qv {  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &#<>fT_  
>jpk R  
  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; 3Hkb)Wu  
_r vO#h  
  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; NSQ#\:3:S  
tQcn%CK  
  5、 添加代码,编译运行程序。 01vKx)f  
<6!/B[!O=  
三、程序代码 X5c)T}pyv  
6|]e}I@<2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL WXCZ }l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SJ8|~,vL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Oi\,clR^[o  
#if _MSC_VER > 1000 G*rlU  
#pragma once swG!O}29OX  
#endif // _MSC_VER > 1000 2q%vd =T  
#ifndef __AFXWIN_H__ MLt'tzgl  
#error include 'stdafx.h' before including this file for PCH dR >hb*k J  
#endif yIma7H@=L  
#include "resource.h" // main symbols S3> <zGYk  
class CHookApp : public CWinApp &9\8IR>  
{ e2L4E8ST<  
 public: qruv^#_l   
  CHookApp(); Y%@a~|  
  // Overrides vABUUAo!Jr  
  // ClassWizard generated virtual function overrides 3V@!}@y,F6  
  //{{AFX_VIRTUAL(CHookApp) w*B4>FYg  
 public: utBKl' `  
  virtual BOOL InitInstance(); aui3Mq#f  
  virtual int ExitInstance(); (z IIC"~5  
  //}}AFX_VIRTUAL bSS=<G9  
  //{{AFX_MSG(CHookApp) O@sJ#i>  
  // NOTE - the ClassWizard will add and remove member functions here. a_o99lP  
  // DO NOT EDIT what you see in these blocks of generated code ! Bngvm9k3  
  //}}AFX_MSG CL<m+dW%*  
  DECLARE_MESSAGE_MAP() eX <@qa4<  
}; lH%-#2]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OjfumZL#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 287)\FU;3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jQ9i<-zc  
BOOL InitHotkey(); uui3jZ:  
BOOL UnInit(); ,w0Io   
#endif u]s}@(+.  
_?a.S8LxJZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,_RPy2N  
#include "stdafx.h" :x36Z4:  
#include "hook.h" Yo[Pu< zR  
#include <windowsx.h> x aW9Sj0ZM  
#ifdef _DEBUG Qs;MEt1  
#define new DEBUG_NEW Q7XlFjzcm  
#undef THIS_FILE {V5eHn9/Q'  
static char THIS_FILE[] = __FILE__; <,I]=+A  
#endif FP9FE `x  
#define MAX_KEY 100 btWvoKO*  
#define CTRLBIT 0x04 do=s=&T  
#define ALTBIT 0x02 HiT j-O  
#define SHIFTBIT 0x01 > PONu]^  
#pragma data_seg("shareddata") wUcp_)aE|  
HHOOK hHook =NULL; 5yQ\s[;o3  
UINT nHookCount =0; y rmi:=N(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n+:}p D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]6z ; M;F`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~oE@y6Q  
static int KeyCount =0; ^4[|&E:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8 ;o*c6+  
#pragma data_seg() l[M?"<Ot;  
HINSTANCE hins; Geyj`t  
void VerifyWindow(); ~<q^4w.=7C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) (K3eb  
//{{AFX_MSG_MAP(CHookApp) ^ 9FRI9?  
// NOTE - the ClassWizard will add and remove mapping macros here. <F<jx"/)  
// DO NOT EDIT what you see in these blocks of generated code! %M u$0~ct"  
//}}AFX_MSG_MAP l|5;&(Y+s  
END_MESSAGE_MAP() B dKD%CJ[  
@"'$e_jj"  
CHookApp::CHookApp() zE1=*zO`  
{ ZA.i\ ;2  
 // TODO: add construction code here, >!%F$$  
 // Place all significant initialization in InitInstance 2~RG\JWTA  
} .Fm@OQr  
#Hi$squJ  
CHookApp theApp; a474[?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,'>O#kD  
{ eGQ -Ht,N  
 BOOL bProcessed=FALSE; B:=VMX~GE  
 if(HC_ACTION==nCode) Ff{dOV.i  
 { _"G./X  
  if((lParam&0xc0000000)==0xc0000000){// Key up U['|t<^uf  
   switch(wParam) hLF;MH@  
   { $W0O  
    case VK_MENU: y$U(oIU>  
     MaskBits&=~ALTBIT; J3,m{%EtNM  
     break; &~sirxR p  
    case VK_CONTROL: #D|n6[Y'.t  
     MaskBits&=~CTRLBIT; /L*JHNu"_  
     break; mk]8}+^.  
    case VK_SHIFT: BSHtoD@e7  
     MaskBits&=~SHIFTBIT; D%!GY1wdn  
     break; !FHm.E_>  
    default: //judge the key and send message Q+a"Z^Z|  
     break; [ %6(1$Ih  
   } D2MWrX  
   for(int index=0;index<MAX_KEY;index++){ O7lFg;9c`  
    if(hCallWnd[index]==NULL) a+P Vi  
     continue; vz3#.a~2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?yy,3:  
    { j6DI$tV~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "ot# g"  
     bProcessed=TRUE; 2C"[0*.[N  
    } 1AAOg+Y@U"  
   } v]X*(e  
  } K410.o/=-  
  else if((lParam&0xc000ffff)==1){ //Key down xvTz|Y  
   switch(wParam) h"t\x}8qq  
   { vk.P| Y-;  
    case VK_MENU: VQl(5\6O  
     MaskBits|=ALTBIT; ,'&H`h54  
     break; JUd Q Q  
    case VK_CONTROL: #VynADPs`o  
     MaskBits|=CTRLBIT; /nB|Fo_&Q  
     break; B<oBo&uA  
    case VK_SHIFT: ^vha4<'-qG  
     MaskBits|=SHIFTBIT; e]-%P(}Z  
     break; +~f=L- >  
    default: //judge the key and send message 2./;i>H[u  
     break; YuFR*W;$  
   } rceX|i>9n  
   for(int index=0;index<MAX_KEY;index++) ciGJtD&P  
   { TeNPuY~WP  
    if(hCallWnd[index]==NULL) 17F<vo>l%  
     continue; ")@#B=8+3^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jzd)jJ0M  
    { M<'He.n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ! q5qA*  
     bProcessed=TRUE; !Z<=PdI1Ys  
    } i6)HC  
   } w:07_`cH=  
  } 2sH1) ,\  
  if(!bProcessed){ x4-_K%  
   for(int index=0;index<MAX_KEY;index++){ 2(H-q(  
    if(hCallWnd[index]==NULL) d;.H 9Ne  
     continue; '; ;X{a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cUC!'+L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); aM YtWj  
   } e\r%"~v  
  } ?@CbaX~+K  
 } ()e|BFL.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RAj>{/E#W  
} h]pz12Yf  
vW4n>h}]  
BOOL InitHotkey() AL;4-(KH  
{ `T3B  
 if(hHook!=NULL){ #*X\pjZ  
  nHookCount++; Ticx]_+~T  
  return TRUE; bW^C30m  
 } T,h 9xl9i  
 else wEC,Mbn  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \IZY\WU}2  
  if(hHook!=NULL) IR|#]en  
   nHookCount++; A\<W x/  
  return (hHook!=NULL); I &;9  
} AK(x;4  
BOOL UnInit() OJ r~iUr  
{ Go(Td++HS  
 if(nHookCount>1){ ]i\;#pj}  
  nHookCount--; (nAL;:$x2  
  return TRUE; z]R%'LGu  
 } vwAtX($  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Q) =LbR{#  
 if(unhooked==TRUE){ L}6!D zl  
  nHookCount=0; *USG p<iH  
  hHook=NULL; fwNj@fl_,e  
 } 0+F--E4  
 return unhooked; 8kT`5`}lB  
} U1O8u-X  
'OvM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GglGFXOL-  
{ 45rG\$%#  
 BOOL bAdded=FALSE; **JBZ\'  
 for(int index=0;index<MAX_KEY;index++){ sO{TGk]*  
  if(hCallWnd[index]==0){ f$ 7C 5  
   hCallWnd[index]=hWnd; BhhFij4  
   HotKey[index]=cKey; xZA.<Yd^r  
   HotKeyMask[index]=cMask; wSi$.C2  
   bAdded=TRUE; |Wr$5r  
   KeyCount++; )+|Y;zC9  
   break; QD%!a{I  
  } N-W>tng_x  
 } H$.K   
 return bAdded; LVT:oIQ  
} Kc, i$FH  
L~AU4Q0o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xw3j(`w$,  
{ a |#TnSk  
 BOOL bRemoved=FALSE; 9{ #5~WP  
 for(int index=0;index<MAX_KEY;index++){ N&^zXY  
  if(hCallWnd[index]==hWnd){ p<3<Zk 7~0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aa" 3 Io  
    hCallWnd[index]=NULL; A9;,y'm^8  
    HotKey[index]=0; $O%"[w  
    HotKeyMask[index]=0; DTG-R>y^  
    bRemoved=TRUE; Jj?HOtaM  
    KeyCount--; O]' 2<;  
    break; RL3*fRlb  
   } %SuELm  
  } xpc{#/Nk  
 } yD#(Iw  
 return bRemoved; Cz &3=),G  
} :$0yp`k  
-V-I&sO<  
void VerifyWindow() zwz_K!229  
{ e;g7Ek3n  
 for(int i=0;i<MAX_KEY;i++){ &gKDw!al  
  if(hCallWnd!=NULL){ qw1W }+~g  
   if(!IsWindow(hCallWnd)){ #k?.dWZ!  
    hCallWnd=NULL; \&b 9  
    HotKey=0; `QtkC>[  
    HotKeyMask=0; +P8CC fPu  
    KeyCount--; /l_u $"  
   } -K3d u&j  
  } "$pbK:  
 } u`D _  
} 4}s'xMT!  
OTl9MwW  
BOOL CHookApp::InitInstance() .>z1BP:(  
{ YgdQC(ib  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "blq)qo)  
 hins=AfxGetInstanceHandle(); lV$CBS  
 InitHotkey(); t<ZBp0  
 return CWinApp::InitInstance(); ==Xy'n9'  
} Q-rG~O9-  
g9fYt&  
int CHookApp::ExitInstance() U8J9 #+:  
{ D<|$ZuB4  
 VerifyWindow(); XRO(p`OE-  
 UnInit(); < Sgc6>)  
 return CWinApp::ExitInstance(); &>]U c%JK  
} m2"wMt"*V  
* V7mM?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Yxbg _RQm  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T*%rhnTv0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O-[  
#if _MSC_VER > 1000 "{\xBX~oM  
#pragma once YC')vv3o(  
#endif // _MSC_VER > 1000 H6{Bx2J1*  
'&e8;X  
class CCaptureDlg : public CDialog FvY=!U06  
{ |'z24 :8  
 // Construction {@F'BB\  
 public: = pn;b1=  
  BOOL bTray; ~M8|r!_  
  BOOL bRegistered; zjh:jrv~  
  BOOL RegisterHotkey(); `a83bF35  
  UCHAR cKey; E*`PD<:)H  
  UCHAR cMask; 0G6aF"  
  void DeleteIcon(); q ajZ~oB{  
  void AddIcon(); Wy}^5]R0E  
  UINT nCount; 3E^qh03(  
  void SaveBmp(); }79O[&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T~k@Z  
  // Dialog Data -gm5E qi  
  //{{AFX_DATA(CCaptureDlg) -fXQ62:S  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9!(%Vf>  
  CComboBox m_Key; yo/;@}g}  
  BOOL m_bControl; g'b|[ q  
  BOOL m_bAlt; K4jHha  
  BOOL m_bShift; &a=78Z  
  CString m_Path; 1G7l+6w5~^  
  CString m_Number; Kei0>hBi  
  //}}AFX_DATA sOlnc6  
  // ClassWizard generated virtual function overrides &l3(+4Sh  
  //{{AFX_VIRTUAL(CCaptureDlg) ?_d6 ;  
 public: r7oFG!.?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); FR[I~unqD  
 protected: 1O< 6=oH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y!_{:2H8p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |Y05 *!\P*  
  //}}AFX_VIRTUAL mvK^')  
  // Implementation y: x<`E=  
 protected: W#~7X  
  HICON m_hIcon; a#"orc j  
  // Generated message map functions '~Cn+xf4]  
  //{{AFX_MSG(CCaptureDlg) )v_v 7 ~H&  
  virtual BOOL OnInitDialog(); ,}&TZkN{-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v@tEHRadz  
  afx_msg void OnPaint(); YI ?P@y  
  afx_msg HCURSOR OnQueryDragIcon(); :;.^r,QAI  
  virtual void OnCancel(); D\b$$z]q  
  afx_msg void OnAbout(); 51b%uz  
  afx_msg void OnBrowse(); )ds]fvMW]N  
  afx_msg void OnChange(); :ujpLIjvVG  
 //}}AFX_MSG :CW^$Zvq  
 DECLARE_MESSAGE_MAP() ""jW'%wR  
}; \c CH/  
#endif (;;ji!i  
;b*qunJ3L  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fs 2MYat  
#include "stdafx.h" l=p_  
#include "Capture.h" 5{k,/Z[L  
#include "CaptureDlg.h" 'E9{qPLk(  
#include <windowsx.h> h{iuk3G`h6  
#pragma comment(lib,"hook.lib") wpuK?fP  
#ifdef _DEBUG 6ICW>#fI`  
#define new DEBUG_NEW ! #_2 ![  
#undef THIS_FILE 'mbLK#q  
static char THIS_FILE[] = __FILE__; hdCd:6   
#endif O*GF/ R8B  
#define IDM_SHELL WM_USER+1 j :B/ FL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uR :EH.K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R%RxF=@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G(.G>8pf  
class CAboutDlg : public CDialog Ba8=nGa4KY  
{  Q&xH  
 public: WM?-BIlT=  
  CAboutDlg(); W/bW=.d Jd  
  // Dialog Data - [h[  
  //{{AFX_DATA(CAboutDlg) #i@f%Bq-  
  enum { IDD = IDD_ABOUTBOX }; X':FFD4h  
  //}}AFX_DATA Ajm!;LA[jO  
  // ClassWizard generated virtual function overrides } LS8q  
  //{{AFX_VIRTUAL(CAboutDlg) 4h@,hY1#  
 protected: !(F?`([A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lbda/Zx  
  //}}AFX_VIRTUAL UjQz   
  // Implementation _\X ,a5Un  
 protected: j=irx5:  
  //{{AFX_MSG(CAboutDlg) BP@tI|  
  //}}AFX_MSG P?/JyiO }  
  DECLARE_MESSAGE_MAP() JkWhYP}  
}; e O\72? K  
Bh2l3J4X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <[)-Q~Gg5  
{ W&Fm ;m@M  
 //{{AFX_DATA_INIT(CAboutDlg) 9GH5  
 //}}AFX_DATA_INIT 8#yu.\N.xt  
} &>,]YrU  
d<7b<f"~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yy8-t2V  
{ P.XT1)qo*  
 CDialog::DoDataExchange(pDX); UgGa]b[9A  
 //{{AFX_DATA_MAP(CAboutDlg) 'wk,t^)  
 //}}AFX_DATA_MAP ?'6@m86d  
} I?}jf?!oM  
IU"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bpwA|H%{M  
 //{{AFX_MSG_MAP(CAboutDlg) ?h&XIM(  
 // No message handlers 5<dg@,\  
 //}}AFX_MSG_MAP MSQ^ovph  
END_MESSAGE_MAP() ]nUrE6  
!vAmjjB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /S"jO [n9b  
: CDialog(CCaptureDlg::IDD, pParent) ?I6rW JcQ6  
{ E+O{^C=  
 //{{AFX_DATA_INIT(CCaptureDlg) ;yomaAr  
  m_bControl = FALSE; )~wKRyQff  
  m_bAlt = FALSE; S4_/%~?  
  m_bShift = FALSE; Pj <U|\-?  
  m_Path = _T("c:\\"); d j\Z}[  
  m_Number = _T("0 picture captured."); XYzaSp=bb  
  nCount=0; Gn8 sB  
  bRegistered=FALSE; _GG\SWm  
  bTray=FALSE; /ovVS6Ai  
 //}}AFX_DATA_INIT d-_V*rYU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '-%1ILK$3r  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1z8"Gk6  
} <3{MS],<<  
>n09K8 A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Jx.f DVJ  
{ am]M2+,2Ip  
 CDialog::DoDataExchange(pDX); [ @eA o>  
 //{{AFX_DATA_MAP(CCaptureDlg) 7?=^0?a  
  DDX_Control(pDX, IDC_KEY, m_Key); XG.[C>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); V+"%BrM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); '%rT]u3U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p3U)J&]c6  
  DDX_Text(pDX, IDC_PATH, m_Path); Rsfb?${0G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); M9W zsWM  
 //}}AFX_DATA_MAP r&E gP  
} VhkM{O  
MT&aH~YB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |X8?B =  
//{{AFX_MSG_MAP(CCaptureDlg) [Jt}^  
 ON_WM_SYSCOMMAND() >4X2uNbZS  
 ON_WM_PAINT() | ky40[C  
 ON_WM_QUERYDRAGICON() ~JXz  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $CEdJ+0z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) cb9-~*1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ?.VKVTX^  
//}}AFX_MSG_MAP _cs(f<>oCO  
END_MESSAGE_MAP() T o["o!(;z  
}d?;kt  
BOOL CCaptureDlg::OnInitDialog() GJ*IH9YR  
{ O%T?+1E  
 CDialog::OnInitDialog(); " !EnQB=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Dds-;9  
 ASSERT(IDM_ABOUTBOX < 0xF000); K'ZNIRr/ C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !vgY3S0?rq  
 if (pSysMenu != NULL) ;0 B1P|7zK  
 { [LnPV2@e  
  CString strAboutMenu; Vn^GJ'^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0P5VbDv$r7  
  if (!strAboutMenu.IsEmpty())  1c0' i  
  { $yASWz  
   pSysMenu->AppendMenu(MF_SEPARATOR); f=l/Fp}4UH  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +^Xf:r` G  
  } bZYayjxZ5i  
 } ZW [&7[4  
 SetIcon(m_hIcon, TRUE); // Set big icon &THtQ1D  
 SetIcon(m_hIcon, FALSE); // Set small icon .#QE*<T)]  
 m_Key.SetCurSel(0); @A1f#Ed<  
 RegisterHotkey(); $t;:"i>  
 CMenu* pMenu=GetSystemMenu(FALSE); Hx gC*-A$/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); s6|'s<x"j  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  :RnUNz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {6ZSf[Y6B  
 return TRUE; // return TRUE unless you set the focus to a control fY00  
} 0DicrnH8  
d{7ZO#E  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "] V\Y!  
{ A2 + %  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M~2Us{ `  
 { kg^0%-F  
  CAboutDlg dlgAbout; h vYRAQR:  
  dlgAbout.DoModal(); .2E/(VM  
 } 0zH-g  
 else R2Tt6  
 { ^!\1q<@n  
  CDialog::OnSysCommand(nID, lParam); #"UO`2~`l  
 } X hq ss),  
} H@uu;:l<7A  
x2B8G;6u  
void CCaptureDlg::OnPaint() `}?;Ow&2CY  
{ QOXo(S  
 if (IsIconic()) 0 %~~IT}U  
 { jB?SX  
  CPaintDC dc(this); // device context for painting w.x&3aG  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n2mO-ZXud  
  // Center icon in client rectangle H4y9\ -  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^N/d`IAjv  
  int cyIcon = GetSystemMetrics(SM_CYICON); r ]7: ?ir  
  CRect rect; X9Ch(nWX  
  GetClientRect(&rect); :PT{>r[  
  int x = (rect.Width() - cxIcon + 1) / 2; \t!~s^Oox  
  int y = (rect.Height() - cyIcon + 1) / 2; ,JZ>)(@)  
  // Draw the icon AO7[SHDZ  
  dc.DrawIcon(x, y, m_hIcon); rE m/Q!  
 } oy8jc];SO  
 else `> %QCc\  
 { Q7aPW\-  
  CDialog::OnPaint(); Jo { :]:  
 } r'*$'QY-N  
} ?/o 8f7Z  
ZHNL ~=r}  
HCURSOR CCaptureDlg::OnQueryDragIcon() !.6n=r8 d  
{ # sw4)*v  
 return (HCURSOR) m_hIcon; v.(dOIrX  
} sE[`x^1'8  
a.V5fl0?I@  
void CCaptureDlg::OnCancel() CV @P +  
{ |}4\Gm  
 if(bTray) f}bq  
  DeleteIcon(); r84^/+"T  
  CDialog::OnCancel(); D}?p>e|<D  
} 60~;UBm5O  
wtYgHC}X  
void CCaptureDlg::OnAbout() Cy[G7A%  
{ Fx:38Ae  
 CAboutDlg dlg; ~$u9  
 dlg.DoModal(); =Dq&lm,n  
} _qa]T'8  
T [SK>z  
void CCaptureDlg::OnBrowse() )$!b`u  
{ 5_;-Qw  
 CString str; kO\ O$J^S  
 BROWSEINFO bi; WutPy_L<  
 char name[MAX_PATH]; 6nL^"3@S!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9rMO=  
 bi.hwndOwner=GetSafeHwnd(); ^VXhv9\>B  
 bi.pszDisplayName=name; MDlH[PJ@i  
 bi.lpszTitle="Select folder"; M.Yp'Av  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C 7C4 eW8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ooVs8T2  
 if(idl==NULL) I> ;{BYPV  
  return; yJI~{VmU7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3=d%WPgQ  
 str.ReleaseBuffer(); +4:eb)e  
 m_Path=str; !mxH/{+|n  
 if(str.GetAt(str.GetLength()-1)!='\\') BEOPZ[Q|c  
  m_Path+="\\"; hWy@?r.  
 UpdateData(FALSE); +cH>'OXoB  
} n<C] 6H  
<L]Gk]k_R  
void CCaptureDlg::SaveBmp() ?0; 2ct  
{ TaRPMKk  
 CDC dc; Z[nHo'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p}QDX*/sSu  
 CBitmap bm;  WwB_L.{  
 int Width=GetSystemMetrics(SM_CXSCREEN); [OCjYC`  
 int Height=GetSystemMetrics(SM_CYSCREEN); G%I .u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]Kt@F0U<o  
 CDC tdc; osXEzr(  
 tdc.CreateCompatibleDC(&dc); Vkg0C*L_  
 CBitmap*pOld=tdc.SelectObject(&bm); q}t]lD %C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @:?[R&`  
 tdc.SelectObject(pOld); d^=)n-!T  
 BITMAP btm; tu}!:5xi  
 bm.GetBitmap(&btm); }i8y/CA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #^L&H oo6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^s{Ff+]W  
 BITMAPINFOHEADER bih; 0#WN2f, <:  
 bih.biBitCount=btm.bmBitsPixel; Uoe{,4T  
 bih.biClrImportant=0; 4:/V|E\D  
 bih.biClrUsed=0; y^C5_w(^jZ  
 bih.biCompression=0; Z^>4qf,k  
 bih.biHeight=btm.bmHeight; D3 C7f'  
 bih.biPlanes=1; fQ5v?(  
 bih.biSize=sizeof(BITMAPINFOHEADER); rn|]-^ku/  
 bih.biSizeImage=size; fB+h( 2N~  
 bih.biWidth=btm.bmWidth; -~]H5er`  
 bih.biXPelsPerMeter=0; Mc,|C)  
 bih.biYPelsPerMeter=0; O.+J%],  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZPH_s^  
 static int filecount=0; 7Y8~ ")f  
 CString name; <YW)8J  
 name.Format("pict%04d.bmp",filecount++); Z{B  e  
 name=m_Path+name; W4o8]&A  
 BITMAPFILEHEADER bfh; fn,n'E]  
 bfh.bfReserved1=bfh.bfReserved2=0; \x-2qlZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); RHFRN&RU$  
 bfh.bfSize=54+size; |<u+Xi ~  
 bfh.bfOffBits=54; cANt7  
 CFile bf; cTq@"v di  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4G,FJjE`p  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); gHPJiiCv  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @mCe{r*`  
  bf.WriteHuge(lpData,size); MSmr7%g3D  
  bf.Close(); .zgh,#=  
  nCount++; Br!;Ac&N  
 } HS <Jp44  
 GlobalFreePtr(lpData); )Jjp^U3Ub  
 if(nCount==1) ?SNacN@r  
  m_Number.Format("%d picture captured.",nCount); 8H4NNj Oy  
 else +ALrHFG  
  m_Number.Format("%d pictures captured.",nCount); 84WD R?  
  UpdateData(FALSE); ~pZ0B#K J  
} &{? M} 2I  
kU/MvoV  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Nud =K'P=  
{ Sh(ys*y>  
 if(pMsg -> message == WM_KEYDOWN) , Wd=!if  
 { W\~ie}D{  
  if(pMsg -> wParam == VK_ESCAPE) M)#9Q=<  
   return TRUE; qob!AU|  
  if(pMsg -> wParam == VK_RETURN) 6-|?ya  
   return TRUE; ms0V1`  
 } }*(_JR4G  
 return CDialog::PreTranslateMessage(pMsg); sm`c9[E  
} 7y=O!?*  
h}a}HabA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m FTuqujO  
{ iF+:j8 b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?xqS#^Z  
  SaveBmp(); !+eU  
  return FALSE; !K(  
} m538p.(LIR  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $Y7VA  
 CMenu pop; :%h1Q>F  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9jjeZc'  
 CMenu*pMenu=pop.GetSubMenu(0); UDI\o1Rbp  
 pMenu->SetDefaultItem(ID_EXITICON); $_F_%m"\  
 CPoint pt; j;`pAN('  
 GetCursorPos(&pt); 5@xR`g-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oT\K P  
 if(id==ID_EXITICON) Ga 5s9wC  
  DeleteIcon(); cjL)M=pIS  
 else if(id==ID_EXIT) a_c(7bQ  
  OnCancel(); B2kZ_4rB  
 return FALSE; fx|d"VF[  
} t}k:wzZ@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); b@CjnAZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6]iU-k0b  
 AddIcon(); W+a/>U  
 return res; #HgN wM  
} "Vq= Ph  
UE^o}Eyg  
void CCaptureDlg::AddIcon() @.7/lRr@bp  
{ Z 01A~_  
 NOTIFYICONDATA data; O4X03fUx  
 data.cbSize=sizeof(NOTIFYICONDATA); ]B )nN':  
 CString tip; c ?CD;Pk  
 tip.LoadString(IDS_ICONTIP); jVnTpa!A  
 data.hIcon=GetIcon(0); 8vuTF*{yZ  
 data.hWnd=GetSafeHwnd(); S%MDQTM  
 strcpy(data.szTip,tip); HVus\s\&y%  
 data.uCallbackMessage=IDM_SHELL; MU$tX  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  `vH|P  
 data.uID=98; T!,5dt8L  
 Shell_NotifyIcon(NIM_ADD,&data); Bg),Q8\I  
 ShowWindow(SW_HIDE); ^mq(j_E.  
 bTray=TRUE; JxinfWk  
} {?:]'c  
;\w3IAa|V  
void CCaptureDlg::DeleteIcon() ~qqxHymc  
{ <<LLEdB  
 NOTIFYICONDATA data; bRu 9*4t  
 data.cbSize=sizeof(NOTIFYICONDATA); kqKT>xo4EZ  
 data.hWnd=GetSafeHwnd(); 5)< Y3nU~  
 data.uID=98; 48 wt  
 Shell_NotifyIcon(NIM_DELETE,&data); %JBLp xnq  
 ShowWindow(SW_SHOW); ta{24{?M\  
 SetForegroundWindow(); eOb--@~8  
 ShowWindow(SW_SHOWNORMAL); rY(7IX  
 bTray=FALSE; ~T;:Tg*  
} 9KX% O-'  
B(M-;F  
void CCaptureDlg::OnChange() `F/R:!v  
{ E "=4(   
 RegisterHotkey(); ?'~u)O(n  
} 68P'<|u?  
= vqJ0!  
BOOL CCaptureDlg::RegisterHotkey() b4L7]&  
{ !AXLoq$SY  
 UpdateData(); >0@w"aKn  
 UCHAR mask=0; ;)h?P.]  
 UCHAR key=0; :!s7B|_U  
 if(m_bControl) s/hgWW$  
  mask|=4; #~'d Y\&  
 if(m_bAlt) #qVTB@d  
  mask|=2; 9@CRL=  
 if(m_bShift) 8|@) #:  
  mask|=1; }kt%dDU  
  key=Key_Table[m_Key.GetCurSel()]; f#&z m} t  
 if(bRegistered){ }6^5mhsL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); N & b3cV  
  bRegistered=FALSE; y]t19G+  
 } JRC2+BU /  
 cMask=mask; w=fWW^>bP  
 cKey=key; Y\WQ0'y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;@S'8  
 return bRegistered; Jd/d\P  
} _yAY5TIv  
=iB[sLEJ  
  四、小结 k}:;`ST  
+JYb)rn$^  
  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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