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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: `y`xk<q  
  ~S3eatM$9  
  一、实现方法 />C~a]}  
+!v RU`  
  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: ^NDX4d;  
7mM;Q  
#pragma data_seg("shareddata") O[ !o1.  
HHOOK hHook =NULL; //钩子句柄 %U GlAyj  
UINT nHookCount =0; //挂接的程序数目 >|?T|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 eEQ[^i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !qlGt)G3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `dP+5u!  
static int KeyCount =0; \#aVu^`eX  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Gq*)]X{U a  
#pragma data_seg() j;)g+9`  
^%&x{F.  
  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。 %K"%Qm=Tl  
Jdn*?hc+  
  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: d 4]%Wdvf  
BuTIJb+Q\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H |UL5<:]D  
cKey,UCHAR cMask) %z~U@Mka  
{ >Mw &Tw}o  
 BOOL bAdded=FALSE; #ja`+w}  
 for(int index=0;index<MAX_KEY;index++){ t\i1VXtO  
  if(hCallWnd[index]==0){ m]\zt  
   hCallWnd[index]=hWnd; SbZt\a 8  
   HotKey[index]=cKey; hZ<btN .y5  
   HotKeyMask[index]=cMask; cA? x(  
   bAdded=TRUE; aLi_Hrb9  
   KeyCount++; K//T}-Uub  
   break; VA'X!(Cv  
  } }4SSo)Uv/  
 } Y/H^*1  
 return bAdded; xXZKj  
} b`W*vduf  
//删除热键 |*KS<iHr%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "<x~{BN?  
{ lGUV(D  
 BOOL bRemoved=FALSE; oDP((I2-  
 for(int index=0;index<MAX_KEY;index++){ NRisr  
  if(hCallWnd[index]==hWnd){ X5Y `(/V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ WuFwt\U  
    hCallWnd[index]=NULL;  J4"swPf  
    HotKey[index]=0; hw$c@:pW;  
    HotKeyMask[index]=0; ( 'n8=J  
    bRemoved=TRUE; E[.tQ|C  
    KeyCount--; br  Z, s  
    break; A&c@8  
   } P0e""9JOo  
  } TE%#$q  
 } "F$o!Vk  
 return bRemoved; [fi'=Cb  
} ShJK&70O  
|<-F|v9og  
F,M"/hnPT  
  DLL中的钩子函数如下: P4j8`}&/  
,6;xr'[o*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }b+QYSt  
{ 1/ pA/UVO  
 BOOL bProcessed=FALSE; _]xt65TL  
 if(HC_ACTION==nCode) RR!!hY3 K  
 { .3<IOtD=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Jh4&Qh|t  
   switch(wParam) x$GsDV  
   {  xDJ+BQ<1A  
    case VK_MENU: l(#ke  
     MaskBits&=~ALTBIT; yW^IN8fm  
     break; ^qO=~U!{  
    case VK_CONTROL: !UoU#YU  
     MaskBits&=~CTRLBIT; Zknewv*sS4  
     break; vA"niO  
    case VK_SHIFT: \c~{o+UD-  
     MaskBits&=~SHIFTBIT; knOn UU  
     break; rN1U.FRe/  
    default: //judge the key and send message ; ,=h59`  
     break; :e]9T3Q  
   } 5 n+ e  
   for(int index=0;index<MAX_KEY;index++){ +K%pxuVh  
    if(hCallWnd[index]==NULL) pzq; vMr  
     continue; {HHh.K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #[a"%byTR  
    { ) wY!/&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g&+Y{*Gp  
     bProcessed=TRUE; 6f?BltFaN  
    } 7q!yCU  
   } 4b2mtLn_  
  } Mf:M3H%YV+  
  else if((lParam&0xc000ffff)==1){ //有键按下 BKQIo)g.G  
   switch(wParam) sQ}%7BMK  
   { <s/<b*T ^  
    case VK_MENU: d)0LVa(  
     MaskBits|=ALTBIT; (+UmUx=  
     break; ZP6x  
    case VK_CONTROL: 'Z.OF5|eGT  
     MaskBits|=CTRLBIT; aLKMDiT  
     break; sr+gD*@h  
    case VK_SHIFT: #_?TIY:h  
     MaskBits|=SHIFTBIT; 'sRg4?PT  
     break; 3G%wZ,)C  
    default: //judge the key and send message |'c4er/;#  
     break; V+O0k: o  
   } G7Z vfLR{:  
   for(int index=0;index<MAX_KEY;index++){ I{42'9  
    if(hCallWnd[index]==NULL) LiZdRr  
     continue; hB?,7-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y98JiNq  
    { cXS;z.M\_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W""*hJ  
     bProcessed=TRUE;  O[IR|  
    } 4r1<,{gCS  
   } NTm<6Is`  
  } RQ^m6)BTo  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 PNbcy!\U  
   for(int index=0;index<MAX_KEY;index++){ #9D/jYK1X  
    if(hCallWnd[index]==NULL) . QXG"R  
     continue; @%OPy|=,{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) & =73D1A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X<~k =qwA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7-".!M  
   } m!5HRjOO  
  } SqXy;S@  
 } 7deAr$?Wx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |Bx||=z`  
} >-5td=:Z  
.!yWF?T8  
  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: 1mHwYT+  
]6{(Hjt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qGnPnQc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); By?nd)  
-RG8<bI,  
  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>*Fj4 Z~  
}+Rgx@XZ\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) . [T'yc:=  
{ /!=U +X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }_{y|NW  
 { &|Lh38s@$#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5LQk8NPh  
  SaveBmp(); @[MO,J&h  
  return FALSE; k SB  
 } + a-wv  
 …… //其它处理及默认处理 #K=b%;>  
} N;-/wip  
59{;VY81  
>u=%Lz"J  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 h6u2j p(+  
`"a? a5]k  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8P,l>HA  
WD15pq l  
  二、编程步骤 K;oV"KRK  
o]Z _@VI  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; gtD   
t< sp%zXZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; w&p~0cA~  
_*s~`jn{H  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; NWEhAj<w  
UT3bd,,  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; \un sh^M  
i[$-_  
  5、 添加代码,编译运行程序。 .#*D!;f  
+7V=aNRlE  
三、程序代码 ]\A1mw-T  
w#*/y?"D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m8'@UzB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) bb|}'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w6vLNX  
#if _MSC_VER > 1000  fO K|:  
#pragma once :qxm !P  
#endif // _MSC_VER > 1000 RX:R*{]-  
#ifndef __AFXWIN_H__ -Q6(+(7_|  
#error include 'stdafx.h' before including this file for PCH 9Ei5z6Vk/+  
#endif `9/0J-7*  
#include "resource.h" // main symbols oP/>ju  
class CHookApp : public CWinApp .iFViVZC  
{ ^6Yd}  
 public: ~gP7s_ qr{  
  CHookApp(); qQ^d9EK'?~  
  // Overrides swt tp`  
  // ClassWizard generated virtual function overrides & =G)NeT_  
  //{{AFX_VIRTUAL(CHookApp) H#OYw#L"u  
 public: PPEq6}  
  virtual BOOL InitInstance(); >-!r9"8@  
  virtual int ExitInstance(); +A@m9  
  //}}AFX_VIRTUAL lbRzx4=\y  
  //{{AFX_MSG(CHookApp) zm> >} 5R  
  // NOTE - the ClassWizard will add and remove member functions here. 5J  ySFG3  
  // DO NOT EDIT what you see in these blocks of generated code ! j(j#0dXLh  
  //}}AFX_MSG [w!C*_V 9  
  DECLARE_MESSAGE_MAP() G\R*#4cF  
}; T/ik/lFI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -$. 0Dc)3!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AcKU^T+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iC\%_5/ _  
BOOL InitHotkey(); alFNSRY  
BOOL UnInit(); le.anJAr  
#endif :vpl+)n  
tZbFvk2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6,X+1EXY  
#include "stdafx.h" 'xIyGDe  
#include "hook.h" Pb#P`L7OB  
#include <windowsx.h> vm8$:W2 }  
#ifdef _DEBUG !v0"$V5+i  
#define new DEBUG_NEW `xCOR  
#undef THIS_FILE 7'z(~3D  
static char THIS_FILE[] = __FILE__; P>(&glr|  
#endif ;`DD}j`  
#define MAX_KEY 100 Xh?4mKgu  
#define CTRLBIT 0x04 P$_&  
#define ALTBIT 0x02 K4:  $=  
#define SHIFTBIT 0x01 P1MvtI4gm  
#pragma data_seg("shareddata") I7~|~<  
HHOOK hHook =NULL; vB.l0!c\e_  
UINT nHookCount =0; [@//#}5v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey zVw:7-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Or7 mD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &=X.*H%  
static int KeyCount =0; |jsb@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift SrFx_n  
#pragma data_seg() |d[5l^6  
HINSTANCE hins; dN< , %}R  
void VerifyWindow(); $E\^v^LW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >TY6O.]  
//{{AFX_MSG_MAP(CHookApp) R::zuv  
// NOTE - the ClassWizard will add and remove mapping macros here. 'S*k_vuN  
// DO NOT EDIT what you see in these blocks of generated code! wjrG7*_Y4v  
//}}AFX_MSG_MAP M%I@<~wl  
END_MESSAGE_MAP() Xw t`(h[u  
[KSH~:h:NR  
CHookApp::CHookApp() )qv2)a!H  
{ Tg0CE60"  
 // TODO: add construction code here, yrnv!moc%t  
 // Place all significant initialization in InitInstance `rlk|&T1  
} vy [C'a  
A|L'ih/  
CHookApp theApp; iPvuz7j=h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (,B#t7ka  
{ f"dSr  
 BOOL bProcessed=FALSE; s3:9$.tiR[  
 if(HC_ACTION==nCode) O(c@PJem  
 { $5NKFJc  
  if((lParam&0xc0000000)==0xc0000000){// Key up py @( <  
   switch(wParam) l(!/Q|Q|  
   { E"6X|I n  
    case VK_MENU: :Wc_Utt  
     MaskBits&=~ALTBIT; Qs%B'9")  
     break; B2Z_]q$n*  
    case VK_CONTROL: rOcg+5  
     MaskBits&=~CTRLBIT; Y]Vq\]m\  
     break; BRzfic :e  
    case VK_SHIFT: 0J9D"3T)  
     MaskBits&=~SHIFTBIT; "j^MB)YD  
     break; ]A^4}CK^<  
    default: //judge the key and send message "hQgLG  
     break; #$E)b:xj  
   } jo9gCP.  
   for(int index=0;index<MAX_KEY;index++){ lyv4fP  
    if(hCallWnd[index]==NULL) >P=Q #;v  
     continue; rzUlO5?R=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P6\6?am  
    { 3TS_-l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XKS8K4"  
     bProcessed=TRUE; 2' ] KTHm  
    } <CZgQ\Mt  
   } , jU5|2  
  } $!B}$I;cd  
  else if((lParam&0xc000ffff)==1){ //Key down ;j9\b9m  
   switch(wParam) w!&~??&=}  
   { QI_4*  
    case VK_MENU: ) #+^ sAO  
     MaskBits|=ALTBIT; l63hLz  
     break; vUesV%9hq  
    case VK_CONTROL: _las;S'oa  
     MaskBits|=CTRLBIT; H43MoC  
     break; }Wh6zT)  
    case VK_SHIFT: S6g<M5^R  
     MaskBits|=SHIFTBIT;  }ptq )p  
     break; a`!@+6yC  
    default: //judge the key and send message ^5; `-Ky  
     break; 2VoKr)  
   } _>yoX  
   for(int index=0;index<MAX_KEY;index++) Uz dc  
   { aG%, cQ1  
    if(hCallWnd[index]==NULL) f-SuM% S_  
     continue; JSr$-C fH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qdf=XG5  
    { S1S;F9F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A/}W&bnluD  
     bProcessed=TRUE; yZ kyC'/  
    } S/tIwG ~e3  
   } Ig6T g ?  
  } :j^FJ@2_  
  if(!bProcessed){ x@KZ ]  
   for(int index=0;index<MAX_KEY;index++){ S DLvi!y  
    if(hCallWnd[index]==NULL) B9,^mE#  
     continue; \tN-(=T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E3aDDFDH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7.g [SBUOG  
   } t2BL( yB  
  } ,|kDsR !  
 } 6 #@ f'~s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); om h{0jA0  
} 7U|mu~$.!  
n$n 7-7  
BOOL InitHotkey() r^,<(pbd  
{ x[ 3A+  
 if(hHook!=NULL){ nh>K`+>co  
  nHookCount++; cV{o?3<:B  
  return TRUE; |r%D\EB  
 } OEx^3z^  
 else hC <O`|lF  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); v <Kmq-b  
  if(hHook!=NULL) U}k9 Py  
   nHookCount++; E&$yuW^z  
  return (hHook!=NULL); Yz$3;  
} $%R$ G`.KM  
BOOL UnInit() &<RpWAk{  
{ ~m^ #FJu  
 if(nHookCount>1){ ^ vilgg~  
  nHookCount--; j _L@U2i  
  return TRUE; wV\gj~U;P  
 } d5 7i)=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <FI-zca  
 if(unhooked==TRUE){ ma'FRt  
  nHookCount=0; 4(Iplo*Ys@  
  hHook=NULL; G  uQ=gN  
 } UFAL1c<V  
 return unhooked; 4k-+?L!/G  
} *jIqAhs0{  
mE%$HZ}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jw<pK4?y  
{ 29CINC  
 BOOL bAdded=FALSE; a ] =  
 for(int index=0;index<MAX_KEY;index++){ }v:jncp  
  if(hCallWnd[index]==0){ %wcSM~w  
   hCallWnd[index]=hWnd; :+Om]#`Vls  
   HotKey[index]=cKey; :0 & X^]\  
   HotKeyMask[index]=cMask; k@ZLg9  
   bAdded=TRUE; 2_vbT!_  
   KeyCount++; B33$pUk  
   break; ABE@n%|`  
  } : G\<y  
 } I$N8tn+E  
 return bAdded; t58e(dgi  
} <Rh6r}f  
r}[7x]sP  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J:&[ 59  
{ WOuEWw=  
 BOOL bRemoved=FALSE; AdRX`[ik  
 for(int index=0;index<MAX_KEY;index++){ <\kr1qH H  
  if(hCallWnd[index]==hWnd){ mKo C.J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [ i#zP  
    hCallWnd[index]=NULL; >SPh2[f  
    HotKey[index]=0; oF(Lji?m  
    HotKeyMask[index]=0; ;qHOOT  
    bRemoved=TRUE; `W/sP\3  
    KeyCount--; #Zrlp.M4  
    break; =] *.ZH#h  
   } mU}F!J#6  
  } pvmC$n^zc  
 } F1L:,.e`  
 return bRemoved; a:QDBS2Llv  
} Uf}\p~;  
M%jPH  
void VerifyWindow() Y"A/^]  
{ UfS%71l.$  
 for(int i=0;i<MAX_KEY;i++){ p+)YTzzc  
  if(hCallWnd!=NULL){ ~3uP6\F  
   if(!IsWindow(hCallWnd)){ V<k8N^  
    hCallWnd=NULL; C8z{XSo  
    HotKey=0; "*G.EiLq  
    HotKeyMask=0; 8\:NMP8W\  
    KeyCount--; p<M\U"5Ye  
   } Y>'|oygHA  
  } cM&{+el  
 } E[Cb|E  
} |4'Y/re  
jH_JmYd  
BOOL CHookApp::InitInstance() BcI |:qv|  
{ zOQ>d|p?X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); B^g ?=|{  
 hins=AfxGetInstanceHandle(); h@a+NE8  
 InitHotkey(); c y8;@[#9  
 return CWinApp::InitInstance(); lRXK\xIP ,  
} 8By|@LO  
eq U ME  
int CHookApp::ExitInstance() h: 9Zt0,  
{ #8)*1?  
 VerifyWindow(); ;Iq/l%vX  
 UnInit(); `r?7oxN  
 return CWinApp::ExitInstance(); K4kMM*D  
} ,G)r=$XU  
T#>7ub  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file o"*AtGR+"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 812$`5l  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t.;LnrY  
#if _MSC_VER > 1000 ~?(N  
#pragma once rS;Dmm  
#endif // _MSC_VER > 1000 7Hs%Cc"  
EAM5{Nc  
class CCaptureDlg : public CDialog I'LnI*  
{ 1')%`~  
 // Construction '3g[]M@M  
 public: "s{5O>  
  BOOL bTray; )rC6*eR  
  BOOL bRegistered; ;3@cy|\:  
  BOOL RegisterHotkey(); EVGt 5z  
  UCHAR cKey; +llR204  
  UCHAR cMask; S_Wrw z  
  void DeleteIcon(); 8SGo9[U2  
  void AddIcon(); &G-!qxe  
  UINT nCount; x@ms  
  void SaveBmp(); _fKou2$yz  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor MjU6/pO}L  
  // Dialog Data _ jsK}- \  
  //{{AFX_DATA(CCaptureDlg) .hifsB~  
  enum { IDD = IDD_CAPTURE_DIALOG }; mGK|ihYu  
  CComboBox m_Key; c I4K+  
  BOOL m_bControl; w 47tgPPk  
  BOOL m_bAlt; `G}TG(  
  BOOL m_bShift; (=om,g}  
  CString m_Path; _WRFsDZ'  
  CString m_Number; B\XKw'   
  //}}AFX_DATA xU4 +|d  
  // ClassWizard generated virtual function overrides z*!%g[3I  
  //{{AFX_VIRTUAL(CCaptureDlg) I"A_b}~*}  
 public: /#)/;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xsD($_  
 protected: j-lfMEa$o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %4gg@Z9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ATK_DE Au  
  //}}AFX_VIRTUAL 6}FP  
  // Implementation Jt}Bpg!J  
 protected: 32`{7a3!=  
  HICON m_hIcon;  z62;cv  
  // Generated message map functions j3{D^|0bP  
  //{{AFX_MSG(CCaptureDlg) yjF1}SQ  
  virtual BOOL OnInitDialog(); N u<_}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $adbCY \  
  afx_msg void OnPaint(); 6V7B;tB  
  afx_msg HCURSOR OnQueryDragIcon(); %yv<y+yP~  
  virtual void OnCancel(); ]d! UJ&<?  
  afx_msg void OnAbout(); JPoN&BTCj  
  afx_msg void OnBrowse(); ~=uWD&5B4  
  afx_msg void OnChange(); ,Vt/(x-  
 //}}AFX_MSG 1ng!G 7g  
 DECLARE_MESSAGE_MAP() x$6^R q>2  
}; vzim<;i  
#endif E2Q[ZoVS  
\nPEyw,U  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~Vr.J}]J  
#include "stdafx.h" )p<ExMIxd  
#include "Capture.h" ~?K~L~f5  
#include "CaptureDlg.h" 0.8  2kl  
#include <windowsx.h> )-a'{W/t  
#pragma comment(lib,"hook.lib") &E.^jR~*  
#ifdef _DEBUG ewctkI$,5  
#define new DEBUG_NEW n[lJLm^(_C  
#undef THIS_FILE BRgXr  
static char THIS_FILE[] = __FILE__; JvVWG'Z"  
#endif cj$[E]B3V*  
#define IDM_SHELL WM_USER+1 UG+d-&~Ll  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5kCUaPu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v|dBSX9k0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6WXRP;!Q  
class CAboutDlg : public CDialog CxwoBuG=?  
{ `erV$( M  
 public: /`wvxKX  
  CAboutDlg(); PHZ0P7  
  // Dialog Data =T HpdtL  
  //{{AFX_DATA(CAboutDlg) fSK]|"c  
  enum { IDD = IDD_ABOUTBOX }; ,(EO'T[  
  //}}AFX_DATA `p2+&&]S  
  // ClassWizard generated virtual function overrides n\*!CXc  
  //{{AFX_VIRTUAL(CAboutDlg) |)(VsVG&  
 protected: E&2OD [iX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S4Y&  
  //}}AFX_VIRTUAL u)}$~E>  
  // Implementation UC]\yUK1J  
 protected: 0IBhb(X  
  //{{AFX_MSG(CAboutDlg) Lr$go6s  
  //}}AFX_MSG dfKF%27  
  DECLARE_MESSAGE_MAP() ,!#*GZ.ix  
}; xhV O3LW'  
jB%lB1Q|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) n<O}hM ZT  
{ 2bw_IT  
 //{{AFX_DATA_INIT(CAboutDlg) !dyXJ Q  
 //}}AFX_DATA_INIT <>y;.@}Q  
} itBwCIjG  
-GhP9; d  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (^T F%(H  
{ 5:Z0Pt  
 CDialog::DoDataExchange(pDX); JtYP E?  
 //{{AFX_DATA_MAP(CAboutDlg) }B\a<0L/  
 //}}AFX_DATA_MAP a{^m-fSaR"  
} gQWa24  
0D\#Pq v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }X)&zenz  
 //{{AFX_MSG_MAP(CAboutDlg) ,':fu  
 // No message handlers  P5a4ze  
 //}}AFX_MSG_MAP Mo?~_|}  
END_MESSAGE_MAP() 8m2Tk\;:  
*|%@6I(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =,spvy'"*C  
: CDialog(CCaptureDlg::IDD, pParent) nAW:utTB  
{ %b&". mN  
 //{{AFX_DATA_INIT(CCaptureDlg) l{I6&^!KS  
  m_bControl = FALSE; ($au:'kU  
  m_bAlt = FALSE; x$5) ^ud?  
  m_bShift = FALSE; UO0{):w>  
  m_Path = _T("c:\\"); vQosPS_2L  
  m_Number = _T("0 picture captured."); \?[v{WP)  
  nCount=0; LClNxm2X  
  bRegistered=FALSE; cv998*|X:  
  bTray=FALSE; Ktb\ bw  
 //}}AFX_DATA_INIT >`Y.+4 mE  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^Cu\VV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Aw$x;3y  
} IUE~_7  
j9eTCJqB  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -+(jq>t  
{ |=Eo?Q_  
 CDialog::DoDataExchange(pDX); I4/8 _)b^  
 //{{AFX_DATA_MAP(CCaptureDlg) IHam4$~-  
  DDX_Control(pDX, IDC_KEY, m_Key); QdT}wkX  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z>58dA@f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); N60rgSzI  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @e(o129  
  DDX_Text(pDX, IDC_PATH, m_Path); +giyX7BPJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); nzd2zY>V  
 //}}AFX_DATA_MAP Wk~W Ozr}^  
} 0h#l JS*  
_ky,;9G]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6G1@smP  
//{{AFX_MSG_MAP(CCaptureDlg) v\KA'PmiP  
 ON_WM_SYSCOMMAND() .AR#&mL9  
 ON_WM_PAINT() e@Fo^#ImDx  
 ON_WM_QUERYDRAGICON() lD)%s!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6h|q'.Y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z.7cy@N6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) !}YAdZJ  
//}}AFX_MSG_MAP %`>nS@1zp  
END_MESSAGE_MAP() ?I6fye7  
?k]2*}bz  
BOOL CCaptureDlg::OnInitDialog() >zw.GwN|  
{ q*U*Fu+  
 CDialog::OnInitDialog(); K{&mI/ ;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @Z*W  
 ASSERT(IDM_ABOUTBOX < 0xF000); Bp_$.!Qy  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tjIl-IQ  
 if (pSysMenu != NULL) a|%J=k>>  
 { 9>l*lCA  
  CString strAboutMenu; Ov 5"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); w`4=_J=GO  
  if (!strAboutMenu.IsEmpty()) ^V?<K.F  
  { ^8 zR  
   pSysMenu->AppendMenu(MF_SEPARATOR); rf $QxJ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o)Iff)m$  
  } $;1#To  
 }  3,p]/Z_  
 SetIcon(m_hIcon, TRUE); // Set big icon Rn}l6kbM  
 SetIcon(m_hIcon, FALSE); // Set small icon gp5_Z-me  
 m_Key.SetCurSel(0); *,e:]!*  
 RegisterHotkey(); ]JCvyz H  
 CMenu* pMenu=GetSystemMenu(FALSE); zz+$=(T:M  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); KC/=TSSXd.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -m)X]]~C  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pOGeru u?  
 return TRUE; // return TRUE unless you set the focus to a control ?3nR  
} CnpV:>V=  
*!q1Kr6r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C`$n[kCJ  
{ l n{e1':$"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8K.R=  
 { 7op`s5i  
  CAboutDlg dlgAbout; &+cEV6vb+  
  dlgAbout.DoModal(); iIMd!Q.)@  
 } ~D<IB#C  
 else SG6kud\b  
 { 5*+!+V^?X  
  CDialog::OnSysCommand(nID, lParam); (zgW%{V@  
 } 0xxg|;h.,g  
} d6'{rje(  
c9HrMgW  
void CCaptureDlg::OnPaint() n!NS(. o  
{ a6D &/8  
 if (IsIconic()) 5~r33L%  
 { MLoYnR^  
  CPaintDC dc(this); // device context for painting G}:w@}h/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E0Y-7&Fv  
  // Center icon in client rectangle RTE8Uq36  
  int cxIcon = GetSystemMetrics(SM_CXICON); RP~|PtLw_  
  int cyIcon = GetSystemMetrics(SM_CYICON); dYG,_ji  
  CRect rect; v'U{/ ,x  
  GetClientRect(&rect); % 5m/  
  int x = (rect.Width() - cxIcon + 1) / 2; qAAX;N  
  int y = (rect.Height() - cyIcon + 1) / 2; z>XrU>}  
  // Draw the icon =T -&j60  
  dc.DrawIcon(x, y, m_hIcon); |uX,5Q#6  
 } T^Y([23  
 else [h^2Y&Au5  
 { M^O2\G#B  
  CDialog::OnPaint(); *C5R}9O5  
 } ;1:Js0=;H  
} !B\R''J5  
,VCyG:dw  
HCURSOR CCaptureDlg::OnQueryDragIcon() W{5#@_pL  
{ {1IfU  
 return (HCURSOR) m_hIcon; ZX>AE3wk  
} %6t2ohO"  
\ Pj  
void CCaptureDlg::OnCancel() !zkZQ2{Wn  
{ G!"YpYml  
 if(bTray) d*jMZ%@uS  
  DeleteIcon(); wj,:"ESb4  
  CDialog::OnCancel(); @CTgT-0!  
} 6{"$nF]  
v:!Z=I}>  
void CCaptureDlg::OnAbout() A;*d}Xe&J  
{ S#MZV@nGF  
 CAboutDlg dlg; ~tBYIkvWT  
 dlg.DoModal(); M@`;JjtSA  
} v*;-yG&  
ex::m&  
void CCaptureDlg::OnBrowse() ]b\yg2  
{ q?4p)@#   
 CString str; -n=^U  
 BROWSEINFO bi; Ont%eC\  
 char name[MAX_PATH]; `}(b2Hc>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Jz7!4mu  
 bi.hwndOwner=GetSafeHwnd(); e8pG"`wM8  
 bi.pszDisplayName=name; F ~^Jmp7Y  
 bi.lpszTitle="Select folder"; `V`lo,"\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ht2\y&si  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); lwrC pD .  
 if(idl==NULL) ,quoRan  
  return; L;*ljZ^c  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |.F$G<  
 str.ReleaseBuffer(); \MbB#  
 m_Path=str; eM$sv9?  
 if(str.GetAt(str.GetLength()-1)!='\\') [Jogt#Fj ]  
  m_Path+="\\"; 0 vtt"f)Y[  
 UpdateData(FALSE); pm_`>3  
} ;5zz<;Zy  
x c/}#>ED  
void CCaptureDlg::SaveBmp() E7.2T^o;M  
{ P>s[tM  
 CDC dc; !ePr5On  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XZ sz/#  
 CBitmap bm; mVVD!  
 int Width=GetSystemMetrics(SM_CXSCREEN); +3BBQ+x!  
 int Height=GetSystemMetrics(SM_CYSCREEN); {[+mpKq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vhpNpgz  
 CDC tdc; Kla'lCZ  
 tdc.CreateCompatibleDC(&dc); $6mX  
 CBitmap*pOld=tdc.SelectObject(&bm); cki81bOT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >4#)r8;dx  
 tdc.SelectObject(pOld); YL]Z<%aKt  
 BITMAP btm; |G?htZF  
 bm.GetBitmap(&btm); Y8m1M-#w  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .#rJ+.2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `(YxI  
 BITMAPINFOHEADER bih; umiBj)r  
 bih.biBitCount=btm.bmBitsPixel; E%r k[wI  
 bih.biClrImportant=0; n/SwP  
 bih.biClrUsed=0; In18_ bc  
 bih.biCompression=0; U.DDaT1  
 bih.biHeight=btm.bmHeight; =p*]Az  
 bih.biPlanes=1; AS =?@2 q  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^>jwh  
 bih.biSizeImage=size; &3bx `C  
 bih.biWidth=btm.bmWidth; jN[`L%Qm   
 bih.biXPelsPerMeter=0; <eQj`HL  
 bih.biYPelsPerMeter=0; {so `/EWa  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [H6hyG~  
 static int filecount=0; a0D%k:k5  
 CString name; D|e uX7b  
 name.Format("pict%04d.bmp",filecount++); k@/sn (x  
 name=m_Path+name; fh](K'P#^  
 BITMAPFILEHEADER bfh; p-Kz-+A[  
 bfh.bfReserved1=bfh.bfReserved2=0; / c AUl  
 bfh.bfType=((WORD)('M'<< 8)|'B'); DNr@u/>vB  
 bfh.bfSize=54+size; wB!Nc Y\p  
 bfh.bfOffBits=54; WU71/PYm`  
 CFile bf; 1JztFix  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ aX5 z&r:{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5]AC*2(  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); thifRd$4  
  bf.WriteHuge(lpData,size); :_g$.h%%  
  bf.Close(); 4lKq{X5<  
  nCount++; ?QFpv #4  
 } wVEm:/;z&  
 GlobalFreePtr(lpData); AaWs}M  
 if(nCount==1) ioYGZ%RG#  
  m_Number.Format("%d picture captured.",nCount); !bN*\c  
 else ,N!o  
  m_Number.Format("%d pictures captured.",nCount); 2E}*v5b,  
  UpdateData(FALSE); P_*" dza  
} _V7r1fY:  
umt.Um.m2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) YVHm{A1b0  
{ FB{KH .  
 if(pMsg -> message == WM_KEYDOWN) -OapVac  
 { ;#vKi0V7  
  if(pMsg -> wParam == VK_ESCAPE) whi`Z:~  
   return TRUE; 23Nw!6S  
  if(pMsg -> wParam == VK_RETURN) ;\14b?TUH  
   return TRUE; LUM@#3&  
 } 0{,Z{&E  
 return CDialog::PreTranslateMessage(pMsg); :lf+W  
} rA%usaW  
-o $QS,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '}B+r@YCN  
{ Q9Kve3u-i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ mi,E-  
  SaveBmp(); P<M?Qd 1.  
  return FALSE; $W!!wN=B  
} kBD>-5Sn_T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $5ak_@AC  
 CMenu pop; P)Rh=U  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j g8fU  
 CMenu*pMenu=pop.GetSubMenu(0); 57umx`m  
 pMenu->SetDefaultItem(ID_EXITICON); jRJn+  
 CPoint pt; 0n;< ge&~R  
 GetCursorPos(&pt); ;"dV"W  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]G5 w6&d  
 if(id==ID_EXITICON) /v- 6WSN  
  DeleteIcon(); }\\KYyjY  
 else if(id==ID_EXIT) _'{_gei_P  
  OnCancel(); amOnqH-(  
 return FALSE; :,'wVS8"]  
} !cO]<CWPq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W4pL ,(S  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KH(%?  
 AddIcon(); gMWjk7  
 return res; <}<zgOT[1!  
} =cm~vDl[  
lku[dQdk  
void CCaptureDlg::AddIcon() Ye2 {f"F  
{ PIu1+k.r?  
 NOTIFYICONDATA data; !g5xq  
 data.cbSize=sizeof(NOTIFYICONDATA); 0 q} *S~  
 CString tip; vms|x wb  
 tip.LoadString(IDS_ICONTIP); $~VRza 8Q  
 data.hIcon=GetIcon(0); K 1 a\b"  
 data.hWnd=GetSafeHwnd(); lij.N) E  
 strcpy(data.szTip,tip); bdC8zDD  
 data.uCallbackMessage=IDM_SHELL; mS(fgq6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UNom-  
 data.uID=98; Ta(Y:*Ri  
 Shell_NotifyIcon(NIM_ADD,&data); LBM ^9W  
 ShowWindow(SW_HIDE); :.Jf0  
 bTray=TRUE; +av@$}  
} W6?pswQ  
="Ho%*@6  
void CCaptureDlg::DeleteIcon() *AO,^R&e.  
{ 'EbWFMjy  
 NOTIFYICONDATA data; jQ2Ot<  
 data.cbSize=sizeof(NOTIFYICONDATA); gtk7)Uh  
 data.hWnd=GetSafeHwnd(); 9N@W\DT  
 data.uID=98; ,z;cbsV-{  
 Shell_NotifyIcon(NIM_DELETE,&data); ]P.'>4  
 ShowWindow(SW_SHOW); :=u?Fqqws  
 SetForegroundWindow(); xe{ !wX  
 ShowWindow(SW_SHOWNORMAL); vk77B(u  
 bTray=FALSE; O_wEcJPE  
} OSs&r$  
:Av#j@#  
void CCaptureDlg::OnChange() ]s'Q_wh_-v  
{ yeXx',]a  
 RegisterHotkey(); A mNW0.}  
} #gRM i)(F  
l_o@miG/  
BOOL CCaptureDlg::RegisterHotkey() *5%d XixN  
{ =Je[c,&j$?  
 UpdateData(); tnH2sHby  
 UCHAR mask=0; $*e2YQdLo  
 UCHAR key=0; B* ?]H*K  
 if(m_bControl) DJ'zz&K  
  mask|=4; coW:DFX  
 if(m_bAlt) &;^YBW:I  
  mask|=2; }=<  
 if(m_bShift) YC++& Nk  
  mask|=1; Z/k:~%|E  
  key=Key_Table[m_Key.GetCurSel()]; l`oZ) ?ur  
 if(bRegistered){ )bS yB29S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~Sj9GxTe  
  bRegistered=FALSE; sDPs G5q<  
 } |TS>h wkI  
 cMask=mask; '[AlhBX  
 cKey=key; w>pq+og&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \-h%O jf4  
 return bRegistered; D{GfL ib"U  
} F*IzQ(#HW  
>AVVEv18  
  四、小结 t;W0"ci9  
\.MR""@y`{  
  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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