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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: q3SYlL'a  
  Hea76P5$P+  
  一、实现方法 ug?])nO.C  
z[E gMS!  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: . #7B10  
Y<h [5  
#pragma data_seg("shareddata") W)OoHpdw  
HHOOK hHook =NULL; //钩子句柄 dI$U{;t  
UINT nHookCount =0; //挂接的程序数目 H.H$5(?O  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  ~[wh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 JGZxNUr^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +DpiX&^h   
static int KeyCount =0;  o(q][:,h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 li`4&<WGC  
#pragma data_seg() >}?4;:.=  
M@wQ6ow  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 "i5Rh^  
OS.oknzZZ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: zA<Hj;9SM  
XH"-sZt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M8,_E\*  
cKey,UCHAR cMask) Q*GJREC  
{ Da@H^  
 BOOL bAdded=FALSE; "&Y5Nh  
 for(int index=0;index<MAX_KEY;index++){ p,cw- lN  
  if(hCallWnd[index]==0){ Wwf],Ya  
   hCallWnd[index]=hWnd; Q r n^T  
   HotKey[index]=cKey; hU]Gv)B  
   HotKeyMask[index]=cMask; Y)7LkZO(y  
   bAdded=TRUE; uyfH;9L5$  
   KeyCount++; eHt |O~  
   break; --t5jSS44  
  } HHZGu8tzt  
 } $%%K9Y  
 return bAdded; ~?BN4ptc  
} yn;sd+:z  
//删除热键 R, J(]ew  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) doj$chy  
{ W/?\8AE  
 BOOL bRemoved=FALSE; %K$f2):  
 for(int index=0;index<MAX_KEY;index++){ Cnv M>]  
  if(hCallWnd[index]==hWnd){ O! t> @%)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =ghN)[AZV  
    hCallWnd[index]=NULL; U`-]U2 "  
    HotKey[index]=0; kpQXnDm 2  
    HotKeyMask[index]=0; !K0:0:  
    bRemoved=TRUE; zHT22o56X  
    KeyCount--; SFaG`T=  
    break; i_KAD U&mP  
   } ~Wox"h}(  
  } .w@o%AO_  
 } QL{^  
 return bRemoved; BB)( #yoi  
} 7YLG<G!v)]  
Gfbeh %  
13lJq:bM  
  DLL中的钩子函数如下: Pv>W`/*_,s  
$QbaPmHW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L)!9+!PKD  
{ AD=qB5:  
 BOOL bProcessed=FALSE; "j<l=l!  
 if(HC_ACTION==nCode) ahnQq9  
 { Ck;>9>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;<?mMi@<E  
   switch(wParam) )j^~=Sio.  
   {  Sj`GP p  
    case VK_MENU: ;n"Nv }<C  
     MaskBits&=~ALTBIT; }qk8^W{  
     break; ! ,*4d $  
    case VK_CONTROL: 7E}.P1  
     MaskBits&=~CTRLBIT; 6(9S'~*'R  
     break; N-~Uu6zr  
    case VK_SHIFT: 3<L>BakD  
     MaskBits&=~SHIFTBIT; q7!$-  
     break; Oosr`e@S  
    default: //judge the key and send message foi@z9  
     break; "PI]k  
   }  6[{|'  
   for(int index=0;index<MAX_KEY;index++){ q!sazVaDp  
    if(hCallWnd[index]==NULL) Fhr5)Z  
     continue; SCUsDr+.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :hA=(iz  
    { |hlc#t ?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <691pk X  
     bProcessed=TRUE; 6n  
    } (C=.&',P  
   } I<["ko,t@?  
  } ~53uUT|B  
  else if((lParam&0xc000ffff)==1){ //有键按下 c-dOb.v0  
   switch(wParam) i- v PJg1  
   { %( tu<  
    case VK_MENU:  #"6O3.P  
     MaskBits|=ALTBIT; c[h{C!d1  
     break; \TF='@u.  
    case VK_CONTROL: ;#goC N.  
     MaskBits|=CTRLBIT; ZjEc\{ s  
     break; nB#m?hK  
    case VK_SHIFT: Vp5i i]B4  
     MaskBits|=SHIFTBIT; tt=JvI9>  
     break; x)h|!T=B~  
    default: //judge the key and send message :zW I"  
     break; m,TN%*U!  
   } &YU; K&  
   for(int index=0;index<MAX_KEY;index++){ u3Qm"?$`  
    if(hCallWnd[index]==NULL) - %5O:n  
     continue; 9 K.B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !T<4em8  
    { @Z fQ)q\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a*oqhOTQ  
     bProcessed=TRUE; Vo@gxC,  
    } ^V1iOf:  
   } Wvg+5Q  
  } `ecIy_O3P&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2D"n#O`y  
   for(int index=0;index<MAX_KEY;index++){ )e1&[0  
    if(hCallWnd[index]==NULL) a fOix"  
     continue; :nYnTo`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?$>#FKrt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wTu_Am  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?aMV{H*Q*  
   } orGkS<P  
  } GO|1O|?  
 } Uzx,aYo X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -{^IT`  
} S>! YBzm&X  
? _>L<Y  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: YoT< ]'  
VN5UJ!$?J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p,)~w1|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D;@nrj`.  
~eVq Fc  
  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: - s}  
s\CZ os&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7jZE(|G-  
{ mn>$K"_k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) a (mgz&*  
 { >l!#_a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ++HHUM  
  SaveBmp(); (pU@$H  
  return FALSE; 3 W%Bsqn  
 } re$xeq\1P?  
 …… //其它处理及默认处理 $CXMeY{tOo  
} (iT?uMRz  
EINjI:/D  
hI^Hqv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ^uDNArDmj5  
-_p+4tV  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 CXe2G5  
C`++r>  
  二、编程步骤 ['*{f(AI  
I"4Lma  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; f4h|Nn%;  
r&MHww1i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hJ>Kfm  
w,,QXJe{Z_  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; N 9.$--X}D  
vq.~8c1  
  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; ;?*`WB  
lU}y%J@  
  5、 添加代码,编译运行程序。 QO-R>  
xYgG  
三、程序代码 _`H2CXG g  
XVlZ:kz  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL kwcH$w<I  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "\n,vNk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0c$0<2D%  
#if _MSC_VER > 1000 aT]G&bR?  
#pragma once n{b(~eL?  
#endif // _MSC_VER > 1000 CSA.6uIT  
#ifndef __AFXWIN_H__ :nt 7jm,  
#error include 'stdafx.h' before including this file for PCH YV6@SXy  
#endif "<e<0::  
#include "resource.h" // main symbols E!,+#%O>  
class CHookApp : public CWinApp @AvDV$F  
{ ptCFW_UV  
 public: IQ5H`o?[B  
  CHookApp(); cEP!DUo  
  // Overrides hZ#ydI|  
  // ClassWizard generated virtual function overrides N`G* h^YQ  
  //{{AFX_VIRTUAL(CHookApp) tfSY(cXg'T  
 public: &EELq"5K  
  virtual BOOL InitInstance(); "5 /i  
  virtual int ExitInstance(); tU5Z?QS  
  //}}AFX_VIRTUAL pq3W.7z;b  
  //{{AFX_MSG(CHookApp) THQd`Lj  
  // NOTE - the ClassWizard will add and remove member functions here. :Z}d#Rbl  
  // DO NOT EDIT what you see in these blocks of generated code ! ]d}h`!:  
  //}}AFX_MSG $s*nh>@7  
  DECLARE_MESSAGE_MAP() TpHvZ]c  
}; ir72fSe  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yR`X3.:*]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9L`5r$/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "&_$%#HUv  
BOOL InitHotkey(); F7FUoew<  
BOOL UnInit(); ]YO &_#  
#endif NFVr$?P  
61XLL/=P  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4P>[]~S  
#include "stdafx.h" zQ&k$l9  
#include "hook.h" .tg2HKD_lW  
#include <windowsx.h> 2/T4.[`t  
#ifdef _DEBUG k^JV37;bl  
#define new DEBUG_NEW 0`LR!X  
#undef THIS_FILE {.D^2mj |  
static char THIS_FILE[] = __FILE__; zq:+e5YT?T  
#endif n]15 ~GO.  
#define MAX_KEY 100 n!Ic.T3PA  
#define CTRLBIT 0x04 Xscm>.di  
#define ALTBIT 0x02 WDM^rjA|j  
#define SHIFTBIT 0x01 g!#M0  
#pragma data_seg("shareddata") 4*)a3jI?  
HHOOK hHook =NULL; MRI`h.  
UINT nHookCount =0; s_/a1o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]uikE2nn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT jHU5>Gt-}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey bv NXA*0  
static int KeyCount =0; V!|:rwG2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift k\ 2.\Lwb  
#pragma data_seg() 9AA_e ~y  
HINSTANCE hins; $N}nO:`t  
void VerifyWindow(); 8zOoVO  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &B3[:nS2  
//{{AFX_MSG_MAP(CHookApp) ( <Abw{BTm  
// NOTE - the ClassWizard will add and remove mapping macros here. Dc2U+U(J  
// DO NOT EDIT what you see in these blocks of generated code! _ $ Wj1h  
//}}AFX_MSG_MAP 75^U<Hz-3{  
END_MESSAGE_MAP() 9{A[n}  
^|P/D  
CHookApp::CHookApp() R#n!1~ (  
{ prdlV)LTpY  
 // TODO: add construction code here, l{2Y[&%  
 // Place all significant initialization in InitInstance RF#S=X6  
} T[?toqkD>z  
P 2j"L#%  
CHookApp theApp; <{z*6FM!'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AjW5H*  
{ B@8M2Pl  
 BOOL bProcessed=FALSE; -MCDX^ >P  
 if(HC_ACTION==nCode) wWaJ%z>3y  
 { K [.*8  
  if((lParam&0xc0000000)==0xc0000000){// Key up e hgUp =  
   switch(wParam) Fm|h3.`V  
   { l2&s4ERqSm  
    case VK_MENU: VJ8 " Q  
     MaskBits&=~ALTBIT; ]1^F  
     break; _#SCjFz  
    case VK_CONTROL: M<%g)jn_  
     MaskBits&=~CTRLBIT; MnQ4,+ji-  
     break; k|r+/gIV  
    case VK_SHIFT: -;i vBR  
     MaskBits&=~SHIFTBIT; 0bcbH9) 1q  
     break; LdPA`oI3j  
    default: //judge the key and send message 5Nt40)E}sN  
     break; BDO]-y  
   } \qo}}I>e  
   for(int index=0;index<MAX_KEY;index++){ mBQp#-1\  
    if(hCallWnd[index]==NULL) "u H VX|`  
     continue; jNC@b>E?~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~8j4IO(  
    { .#4;em%7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'a^'f]"  
     bProcessed=TRUE; FxkxV GZ"  
    } ) ]y^RrD  
   } JM& :dzyIP  
  } S, *  
  else if((lParam&0xc000ffff)==1){ //Key down <Rno ;  
   switch(wParam) Yu`KHvur  
   { Hy*_4r  
    case VK_MENU: >$g+Gx\v4  
     MaskBits|=ALTBIT; |)4aIa  
     break; RyN}Gz/YN  
    case VK_CONTROL: FUD M]:XQ  
     MaskBits|=CTRLBIT; _ Cu,"  
     break; nXg:lCI-uu  
    case VK_SHIFT: Mq#sSBE<K  
     MaskBits|=SHIFTBIT; "Q[rM1R  
     break; b}C6/ zW  
    default: //judge the key and send message CZ~%qPwDw  
     break; [8Yoz1(smA  
   } z5UY0>+VdS  
   for(int index=0;index<MAX_KEY;index++) g?mfpwZj  
   { s (hJ *  
    if(hCallWnd[index]==NULL) '1Z3MjX  
     continue; #\{j/{VZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G'dN_6ho3  
    { c:@lR/oe"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8 etNS~^  
     bProcessed=TRUE; ^p2_p9  
    } 1p DL()t  
   } "h84D&V  
  } oA;> z  
  if(!bProcessed){ |_H{ B+.  
   for(int index=0;index<MAX_KEY;index++){ &l<~Xd#  
    if(hCallWnd[index]==NULL) L+]|-L`S  
     continue; 9P)28\4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >X$I:M<L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `:4bg1u  
   } .Jvy0B} B  
  } [3~mil3rO  
 } Rr!oT?6J?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^]_5oFRIj  
} UD+r{s/%  
f-'$tMs  
BOOL InitHotkey() m|%L[h1  
{ ,Qw\w,  
 if(hHook!=NULL){ SBbPO5^](  
  nHookCount++; RPh8n4&("  
  return TRUE; ~t,-y*=  
 } g3h:oQCS  
 else ]CnqPLqL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); -:P`Rln  
  if(hHook!=NULL) E979qKl  
   nHookCount++; >+3tOv3:  
  return (hHook!=NULL); w<o#/J9  
} [? 1m6u;  
BOOL UnInit() YZHqy++x  
{ M6MtE_E  
 if(nHookCount>1){ f:K3 P[|  
  nHookCount--; }vof| (Yh  
  return TRUE; "x"y3v'  
 } .zMM!l3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6tDCaB  
 if(unhooked==TRUE){ NA<6s]Cs.  
  nHookCount=0; gT=RJB  
  hHook=NULL; "{X_[  
 } d=$1Z. ]  
 return unhooked; @XSxoUF\  
} K]0K/~>8  
4hLv"R.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /qeSR3WC  
{ c8=@ s#  
 BOOL bAdded=FALSE; =I6u*$9<  
 for(int index=0;index<MAX_KEY;index++){ i4p2]Nr t  
  if(hCallWnd[index]==0){ M9J^;3Lrh  
   hCallWnd[index]=hWnd; >.}ewz&9o  
   HotKey[index]=cKey; AY~~a)V  
   HotKeyMask[index]=cMask; $(PWN6{\r^  
   bAdded=TRUE; zB@@Gs>  
   KeyCount++; [-pB}1Dxb  
   break; 3L5o8?[  
  } Ze:Y"49S+>  
 } 'aAay*1  
 return bAdded; !arTR.b\  
} 6 z2_b wo  
M)T{6 w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +'{@Xe}  
{ +P//p$pE  
 BOOL bRemoved=FALSE; Z7@~#)3  
 for(int index=0;index<MAX_KEY;index++){ 45DR%cz  
  if(hCallWnd[index]==hWnd){ w*-1*XNA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1$^=M[v  
    hCallWnd[index]=NULL; puPYM"  
    HotKey[index]=0; J@4,@+X  
    HotKeyMask[index]=0; HbUadPr  
    bRemoved=TRUE; $S(q;Y  
    KeyCount--; xSal=a;k  
    break; :87HXz6]jS  
   } wsg u# as|  
  } G1`H H&  
 } I$#)k^Q  
 return bRemoved; UN"U#Si)  
} }ippi6b:r  
4[$D3,A  
void VerifyWindow() H>/LC* 8-  
{ MY$-D+#/`  
 for(int i=0;i<MAX_KEY;i++){ U(t_uc5q  
  if(hCallWnd!=NULL){ r:n-?P  
   if(!IsWindow(hCallWnd)){ |!=KLJUA  
    hCallWnd=NULL; 1X45~  
    HotKey=0; MG G c  
    HotKeyMask=0; e52y}'L  
    KeyCount--; $sTvXf:g  
   } 4CdST3  
  } |n_es)A  
 } ^^m3 11=  
} a| s64+  
HNj6Iw  
BOOL CHookApp::InitInstance() 3|FZ!8D  
{ z$q:Y g  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); iOO1\9{@  
 hins=AfxGetInstanceHandle(); >FRJvZ6  
 InitHotkey(); HcKZmL. wp  
 return CWinApp::InitInstance(); sIZ|N"2]A*  
} 6'^Gh B  
UVIR P#  
int CHookApp::ExitInstance() +#/`4EnI  
{ O@gHx!L  
 VerifyWindow(); \a|bx4M  
 UnInit(); O(Tdn;1  
 return CWinApp::ExitInstance(); =yZiBJ  
} 01-n_ $b  
nnm9pnx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file UJX=lh.o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :.k)!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a=!I(50  
#if _MSC_VER > 1000 R Wd#)3  
#pragma once 1 iWe&I:  
#endif // _MSC_VER > 1000 fcC?1M[BP~  
>[U.P)7;  
class CCaptureDlg : public CDialog ny,a5zEnF  
{ ^:yg,cS|Be  
 // Construction pOz4>R  
 public: *YI>Q@F9  
  BOOL bTray; 9u->.O: p  
  BOOL bRegistered; <g^!xX<r?  
  BOOL RegisterHotkey(); Owa]ax5  
  UCHAR cKey; 3?"JFfYU,'  
  UCHAR cMask; NP {O  
  void DeleteIcon(); ZMVQo -=  
  void AddIcon(); o@d+<6Um  
  UINT nCount; [9O,C-Mk  
  void SaveBmp(); xzRs;AXOp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2EdKxw3$]  
  // Dialog Data 96&Y  
  //{{AFX_DATA(CCaptureDlg) i7m=V T  
  enum { IDD = IDD_CAPTURE_DIALOG }; R4R SXV  
  CComboBox m_Key; VgSk\:t  
  BOOL m_bControl; #1v>3H(  
  BOOL m_bAlt; N]k(8K  
  BOOL m_bShift; ^uy2qO4Yw  
  CString m_Path; qU1^ K  
  CString m_Number; &Vtgh3I  
  //}}AFX_DATA oo:(GfO}  
  // ClassWizard generated virtual function overrides d/Z258  
  //{{AFX_VIRTUAL(CCaptureDlg) ?xTh}Sky  
 public: g7|$JevR0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); r:&"#F   
 protected: 77Fpb?0`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iSZiJ4AUq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0F\ e*{gc  
  //}}AFX_VIRTUAL @"`{gdB$  
  // Implementation 2`o}neF{  
 protected: J01Y%W  
  HICON m_hIcon; #e!4njdM  
  // Generated message map functions ;I#S m;  
  //{{AFX_MSG(CCaptureDlg) x 7;Zwd  
  virtual BOOL OnInitDialog(); y,*>+xk,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _uR-Z_z  
  afx_msg void OnPaint(); ~[CtsCiQ  
  afx_msg HCURSOR OnQueryDragIcon(); u I \zDR  
  virtual void OnCancel(); #()u=)  
  afx_msg void OnAbout(); g]z[!&%Ahs  
  afx_msg void OnBrowse(); iZVMDJ?(Z]  
  afx_msg void OnChange(); U~mv1V^.  
 //}}AFX_MSG _V9 O,"DDc  
 DECLARE_MESSAGE_MAP() tkG0xRH  
}; bs%lMa.o  
#endif q]\bJV^/U  
2g6G\F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F=29"1 ._  
#include "stdafx.h" *hT1_  
#include "Capture.h" 6PS #Zydb  
#include "CaptureDlg.h" e*Gm()Vu,  
#include <windowsx.h> e$E~@{[1)  
#pragma comment(lib,"hook.lib") (X rrnoz  
#ifdef _DEBUG M@>EZ  
#define new DEBUG_NEW h9McC3  
#undef THIS_FILE Qr/8kWa0 C  
static char THIS_FILE[] = __FILE__; l @hXQ/  
#endif fC2   
#define IDM_SHELL WM_USER+1 \k=.w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &~u=vuX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [3s p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vu%:0p` K  
class CAboutDlg : public CDialog yW$ja|^ E  
{ pX:FXzYQ  
 public: fC_dSM[{c  
  CAboutDlg(); r 3@Q(Rb  
  // Dialog Data 5ml^3,x  
  //{{AFX_DATA(CAboutDlg) )TceNH  
  enum { IDD = IDD_ABOUTBOX }; .oJs"=h:m  
  //}}AFX_DATA 3sk$B%a>Z  
  // ClassWizard generated virtual function overrides I$Q%i Z{  
  //{{AFX_VIRTUAL(CAboutDlg) i4Y_5  
 protected: *aXZONym  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?,J N?  
  //}}AFX_VIRTUAL Dj<]eG]  
  // Implementation iI[Z|"a21  
 protected: >@yHa'*9S  
  //{{AFX_MSG(CAboutDlg) 3&D;V;ON}_  
  //}}AFX_MSG m[7i<'+S  
  DECLARE_MESSAGE_MAP() IeqJ>t:   
}; qNhQ2x\  
959i2z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ({ 7tp!@  
{ i>9/vwe  
 //{{AFX_DATA_INIT(CAboutDlg) {(7D=\eU  
 //}}AFX_DATA_INIT fb5]eec  
} 7L[HtwI  
|S5N$[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6?/$K{AI  
{ <By R!Y  
 CDialog::DoDataExchange(pDX); 8t$a8 PE  
 //{{AFX_DATA_MAP(CAboutDlg) t5z6{`  
 //}}AFX_DATA_MAP 5q`d=L,  
} Ojkbv  
^|6%~jkD5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) W^2Q"c#7F  
 //{{AFX_MSG_MAP(CAboutDlg) {d\erG(  
 // No message handlers ()}B]?  
 //}}AFX_MSG_MAP 4]N`pD5  
END_MESSAGE_MAP() 2kTLj2 @o,  
AW8"@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P!C!E/Jf5  
: CDialog(CCaptureDlg::IDD, pParent) x@F"ZiYD@O  
{ G 1{F_  
 //{{AFX_DATA_INIT(CCaptureDlg) 8k$iz@e  
  m_bControl = FALSE; ,Ty>sZ#/fz  
  m_bAlt = FALSE; M%wj6!5  
  m_bShift = FALSE; '|0Dt|$  
  m_Path = _T("c:\\"); *M_.>".P  
  m_Number = _T("0 picture captured."); P-L<D!25  
  nCount=0; #&G^%1!  
  bRegistered=FALSE; IKM=Q. 7j  
  bTray=FALSE; ui4H(A'}  
 //}}AFX_DATA_INIT =:U63  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .`!|^h%0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); C#X0Cn0ln  
} A2z%zMlZc  
B.&ly/d  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;l_%;O5  
{ ,CguY/y  
 CDialog::DoDataExchange(pDX); H&6 5X  
 //{{AFX_DATA_MAP(CCaptureDlg) . `lcxC  
  DDX_Control(pDX, IDC_KEY, m_Key); =6t)-53  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); LSQ2pB2V  
  DDX_Check(pDX, IDC_ALT, m_bAlt); E[J7FgU)<S  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); tr2@{xb  
  DDX_Text(pDX, IDC_PATH, m_Path); M:W9h+z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); t_ &FK A  
 //}}AFX_DATA_MAP US+PI`  
} >2 gemTy  
vN%zk(?T  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n 5NkjhP~Z  
//{{AFX_MSG_MAP(CCaptureDlg) )< ~1AL  
 ON_WM_SYSCOMMAND() OGNjn9av  
 ON_WM_PAINT() Cw]Q)rX{  
 ON_WM_QUERYDRAGICON() E9 QA<w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) \%9,< -~[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @b2{'#9]}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^3QHB1I  
//}}AFX_MSG_MAP +/q%29-k  
END_MESSAGE_MAP() v709#/ cR  
TL+a_]3@  
BOOL CCaptureDlg::OnInitDialog() EI2V<v  
{ t#kR@t+6$\  
 CDialog::OnInitDialog(); *k'oP~:fT  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); XpWqL9s_E  
 ASSERT(IDM_ABOUTBOX < 0xF000); VAc-RaA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); g% :Q86u  
 if (pSysMenu != NULL) qFmvc  
 { |jW82L+!N%  
  CString strAboutMenu; -san%H'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4E:HO\  
  if (!strAboutMenu.IsEmpty()) ]yN]^% PYH  
  { 5tR<aIf  
   pSysMenu->AppendMenu(MF_SEPARATOR); OWCd$c_(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %FGPsHH  
  } F ]\4<  
 } .eW}@1+[;  
 SetIcon(m_hIcon, TRUE); // Set big icon ecA[  
 SetIcon(m_hIcon, FALSE); // Set small icon @* L^Jgn  
 m_Key.SetCurSel(0); G*e/Ft.wf8  
 RegisterHotkey(); `9eE139V='  
 CMenu* pMenu=GetSystemMenu(FALSE); \1f$]oS  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .l5y !?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _ Onsfv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); aYe,5dK>  
 return TRUE; // return TRUE unless you set the focus to a control pL>Q'{7s3  
} ,;C92XY  
Ul OoMGg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +L*2 6ar6  
{ <FmrYwt  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =-{+y(<"r  
 { ?s(%3_h  
  CAboutDlg dlgAbout; g ZhE\  
  dlgAbout.DoModal(); TPp%II'*  
 } L #p-AK  
 else 5KU}dw>*g  
 { 13s!gwE)  
  CDialog::OnSysCommand(nID, lParam); >+R`3|o '  
 } q~.\NKc  
} Q4-d2I>0  
qHg\n)R"x!  
void CCaptureDlg::OnPaint() T30!'F(*,  
{ URmx8=q  
 if (IsIconic()) gKcP\m  
 { ` DO`c>>K  
  CPaintDC dc(this); // device context for painting YEAiLC+q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mkTf}[O  
  // Center icon in client rectangle |4pE"6A  
  int cxIcon = GetSystemMetrics(SM_CXICON); Fs<kMT  
  int cyIcon = GetSystemMetrics(SM_CYICON); -DhF> 4f  
  CRect rect; '0U+M{  
  GetClientRect(&rect); J@(=#z8xS  
  int x = (rect.Width() - cxIcon + 1) / 2; A/%K=H?  
  int y = (rect.Height() - cyIcon + 1) / 2; S1wt>}w0$  
  // Draw the icon Nqp%Z7G  
  dc.DrawIcon(x, y, m_hIcon); p0? X R  
 } z}yntY]n  
 else c*K-?n9YMz  
 { -ZH]i}$  
  CDialog::OnPaint(); 3zY"9KUN  
 } ?s#DD,  
} "P.7FD  
VR2BdfKU,  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,\4@Ao  
{ \TkBV?W  
 return (HCURSOR) m_hIcon; 8(q4D K\5u  
} z m\=4^X  
w<&Nn`V  
void CCaptureDlg::OnCancel() ]K?z|&N|HK  
{ SQWwxFJ  
 if(bTray) EU TTeFp  
  DeleteIcon(); beEdH>  
  CDialog::OnCancel(); bSU9sg\  
} 2X;,s`)  
/!oi`8D  
void CCaptureDlg::OnAbout() ${ad[hs  
{ J %jf uj  
 CAboutDlg dlg; \06fP4?  
 dlg.DoModal(); (A\qZtnyl  
} 8},!t\j#]  
SC74r?N FA  
void CCaptureDlg::OnBrowse() Z%6I$KAN8  
{ !0 `44Gbq  
 CString str; _ mhP:O  
 BROWSEINFO bi; [zn`vT  
 char name[MAX_PATH]; Vd4x!Vk  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); cgc| G  
 bi.hwndOwner=GetSafeHwnd(); o~<37J3).  
 bi.pszDisplayName=name; 0XSZ3dY&+  
 bi.lpszTitle="Select folder"; ko@I]gi2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; P )_g t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); U: ~O^  
 if(idl==NULL) !FZb3U@  
  return; ;B o2$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); YMj z , N  
 str.ReleaseBuffer(); ueDG1)  
 m_Path=str; k]l M%  
 if(str.GetAt(str.GetLength()-1)!='\\') Cd#[b)d ?^  
  m_Path+="\\"; FGG Fi(  
 UpdateData(FALSE); PbJn8o   
} bqFGDmu6'  
{jcrTjmxe  
void CCaptureDlg::SaveBmp() U P GS  
{ aN}yS=(Ff  
 CDC dc; 4 (& W>E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lE`hC#m  
 CBitmap bm; R"];`F(#  
 int Width=GetSystemMetrics(SM_CXSCREEN); tk|Ew!M:  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0qnToV;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h35x'`g7+r  
 CDC tdc; ~ULuX"n  
 tdc.CreateCompatibleDC(&dc); )/HSt%>  
 CBitmap*pOld=tdc.SelectObject(&bm); rg "W1m[k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ",(-AU!a)h  
 tdc.SelectObject(pOld); VzA~w` $d  
 BITMAP btm; ;<Oe\X  
 bm.GetBitmap(&btm); hdQ[=PH)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5.0BaVwi  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =PP]LDlJs  
 BITMAPINFOHEADER bih; 0yfmQ=,X  
 bih.biBitCount=btm.bmBitsPixel; &7,Kv0j}  
 bih.biClrImportant=0; CSRcTxH  
 bih.biClrUsed=0; CA7tI >y_  
 bih.biCompression=0; xv]P-q0  
 bih.biHeight=btm.bmHeight; ':R)i.TS  
 bih.biPlanes=1; iSUn}%YFz!  
 bih.biSize=sizeof(BITMAPINFOHEADER); /PE3>"|wE  
 bih.biSizeImage=size; K8XXO"  
 bih.biWidth=btm.bmWidth; i d\0yRBt  
 bih.biXPelsPerMeter=0; 5O#CdN-S  
 bih.biYPelsPerMeter=0; 2.p7fu  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =Jg5J5  
 static int filecount=0; h2`W~g_  
 CString name; }at8b ^  
 name.Format("pict%04d.bmp",filecount++); ~!E% GCyFy  
 name=m_Path+name; 6c^2Nl8e  
 BITMAPFILEHEADER bfh; H|tbwU)J  
 bfh.bfReserved1=bfh.bfReserved2=0; P+:FiVj@~  
 bfh.bfType=((WORD)('M'<< 8)|'B');  4>uz'j<  
 bfh.bfSize=54+size; wz+  
 bfh.bfOffBits=54; ((7~o?Vbg  
 CFile bf; AmM^&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6 K P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); q{ n~v>wU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0\qbJ  
  bf.WriteHuge(lpData,size); QxwZ$?w%  
  bf.Close(); T?N' k=   
  nCount++; "(F>?pq  
 } 8wp)aGTcU  
 GlobalFreePtr(lpData); /i"vEI  
 if(nCount==1) mhH[jO)  
  m_Number.Format("%d picture captured.",nCount); F2:+i#lE  
 else ;El"dqH   
  m_Number.Format("%d pictures captured.",nCount); M}!7/8HUC  
  UpdateData(FALSE); $2A%y14  
} >k<.bEx(A  
?5K.#>{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) FTI[YR8?Y  
{ 5JK{dis]k  
 if(pMsg -> message == WM_KEYDOWN) b7E= u0  
 { Bcg\p}  
  if(pMsg -> wParam == VK_ESCAPE) '!]ry<  
   return TRUE; oL1m<cQo9  
  if(pMsg -> wParam == VK_RETURN) eh2w7 @7Q  
   return TRUE; ,DqI> vx|  
 } n,hHh=.Fu  
 return CDialog::PreTranslateMessage(pMsg); { xi$'r  
} t/yGMR=  
_}:9ic]e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (=}U2GD*  
{ M\ vj&T{k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X3tpW`alo  
  SaveBmp(); x$QOOE]  
  return FALSE; ,'v]U@WK  
} (Gf1#,/3~  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ cF_ Y}C  
 CMenu pop; (5]<t&M  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F8$.K*tT  
 CMenu*pMenu=pop.GetSubMenu(0); M&Sjo' ( .  
 pMenu->SetDefaultItem(ID_EXITICON); h`-aO u  
 CPoint pt; C|5eV=f)P  
 GetCursorPos(&pt); R!0O[i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Qv(}*iq]  
 if(id==ID_EXITICON) 0V`s 3,k  
  DeleteIcon(); +e);lS"+/  
 else if(id==ID_EXIT) "1$OPt5  
  OnCancel(); {(U?)4@  
 return FALSE; 8`Q8Mct$<  
} q]T{g*lT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cx_FtD  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3+@p  
 AddIcon(); `YVdIDl]  
 return res; YK!nV ,  
} f;!1=/5u-  
L#Uk=  
void CCaptureDlg::AddIcon() ^8Tq0>n?  
{ R(@B4M2  
 NOTIFYICONDATA data; 9F845M  
 data.cbSize=sizeof(NOTIFYICONDATA); kzny4v[y  
 CString tip; ?wt%e;  
 tip.LoadString(IDS_ICONTIP); @(Wx(3JR?}  
 data.hIcon=GetIcon(0); )WF]v"t  
 data.hWnd=GetSafeHwnd(); r" d/ 9  
 strcpy(data.szTip,tip); [wWip1OR  
 data.uCallbackMessage=IDM_SHELL; |'9%vtbM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "toyfZq@  
 data.uID=98; Q#Q]xJH  
 Shell_NotifyIcon(NIM_ADD,&data); N`1:U 4}  
 ShowWindow(SW_HIDE); 2>p K  
 bTray=TRUE; %W~Kx_  
} L}UJ`U  
vQ>x5\r5O_  
void CCaptureDlg::DeleteIcon() 0+jR,5 |  
{ :CH "cbo  
 NOTIFYICONDATA data; ,+-l1GpL  
 data.cbSize=sizeof(NOTIFYICONDATA); 8u Tq0d6(  
 data.hWnd=GetSafeHwnd(); ? acm5dN  
 data.uID=98; _) k=F=  
 Shell_NotifyIcon(NIM_DELETE,&data); 3 GmU$w  
 ShowWindow(SW_SHOW); U+>!DtOYK  
 SetForegroundWindow(); X<dQq`kZ  
 ShowWindow(SW_SHOWNORMAL); `CA-s  
 bTray=FALSE; JV(qTb W  
} De%WT:v  
`[3Iz$K=  
void CCaptureDlg::OnChange() :0|]cHm  
{ -CtLL _I  
 RegisterHotkey(); secD ` ]  
} _TfG-Ae  
|=L~>G  
BOOL CCaptureDlg::RegisterHotkey() jq:FDyOAW  
{ F$QN>wPpM  
 UpdateData(); B{$4s8XU  
 UCHAR mask=0; wi^zXcVj  
 UCHAR key=0; eQ`TW'[9_6  
 if(m_bControl) Aw9se"d  
  mask|=4; z )s{>^D  
 if(m_bAlt) W+36"?*k3  
  mask|=2; 9g3e( z@  
 if(m_bShift) zs|R#?a=  
  mask|=1; k,wr6>'Vt  
  key=Key_Table[m_Key.GetCurSel()]; !`"@!  
 if(bRegistered){ @[h)M3DFd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Wj.f$U 4  
  bRegistered=FALSE; >a7OE=K  
 } #Jp_y|  
 cMask=mask; !2R~/Rg  
 cKey=key; (oTtnQ""+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q xZYy}2  
 return bRegistered; EvSo|}JA[  
} ]Q1?Ox:'  
X`xmV!  
  四、小结 Sm-gi|A  
gw' uY$  
  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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