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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: wcL|{rUXba  
  e84O 6K6o  
  一、实现方法 O[ug7\cl+  
mBDzc(_\$'  
  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: CUx [LZR7m  
-|GX]jx(Y  
#pragma data_seg("shareddata")  m5lTf  
HHOOK hHook =NULL; //钩子句柄 P"r7m  
UINT nHookCount =0; //挂接的程序数目 AizLzR$OG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JxlZ,FF$@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 lz(}N7SLa  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey zZiga q"  
static int KeyCount =0; `FmRoMW9+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T_oL/x_;  
#pragma data_seg() M! uE#|  
x*wr8$@J  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 K*N8Vpz(  
[q~3$mjQ  
  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: _aw49ag;  
oI x!?,1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ]>,Lw=_[_  
cKey,UCHAR cMask) ,Ofou8C6  
{ !$#8Z".{v{  
 BOOL bAdded=FALSE; Cg]S`R-  
 for(int index=0;index<MAX_KEY;index++){ v(^;%  
  if(hCallWnd[index]==0){ &W N R{  
   hCallWnd[index]=hWnd; iM~qSRb#mJ  
   HotKey[index]=cKey; #yOn /  
   HotKeyMask[index]=cMask; f&? 8fB8{  
   bAdded=TRUE; S~V?Qe@&Z  
   KeyCount++; Im@Yx^gc   
   break; a4eE/1  
  } ) -@Dh6F  
 } #g]eDU-[  
 return bAdded; hv)d  
} mf\@vI  
//删除热键 ] jycg@=B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vzZ"TSP  
{ 6IKi*}  
 BOOL bRemoved=FALSE; I~25}(IDZ"  
 for(int index=0;index<MAX_KEY;index++){ ]_2<uK}fg  
  if(hCallWnd[index]==hWnd){ r-5xo.J'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _Q}vPSJviC  
    hCallWnd[index]=NULL; sLW e \o  
    HotKey[index]=0; _q`f5*Z[  
    HotKeyMask[index]=0; >H,PST  
    bRemoved=TRUE; *[tLwl.  
    KeyCount--; Q=#Wk$1.  
    break; *zWf8X  
   } j4E`O%@^  
  } #XeabcOQ  
 } x_#'6H\1ga  
 return bRemoved; bOK0^$k  
} 5/i]Jni  
.>@]Im  
xi=Qxgx0I  
  DLL中的钩子函数如下: Env_??xq  
i 8:^1rHp)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) A<{&?_U  
{ p~dj-w  
 BOOL bProcessed=FALSE; X,`e1nsR  
 if(HC_ACTION==nCode) O:+?:aI@  
 { cT# R B7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1qhSN#s{_  
   switch(wParam) q[%SF=~<k{  
   {  $i$Z+-W4'  
    case VK_MENU: P;ovPyoO  
     MaskBits&=~ALTBIT; 77;|PKE /  
     break; `,)%<}  
    case VK_CONTROL: M$2lK^2L  
     MaskBits&=~CTRLBIT; EN)0b,ax  
     break; 2,G9~<t  
    case VK_SHIFT: 'Jl73#3  
     MaskBits&=~SHIFTBIT; t#=FFQOt  
     break; d.p%jVO)"  
    default: //judge the key and send message E~1"Nh  
     break; K"VRHIhfg  
   } |%fM*F^7/  
   for(int index=0;index<MAX_KEY;index++){ "K#zY~>L  
    if(hCallWnd[index]==NULL) =VF%Z[Gm  
     continue; \(ju0qFqH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -qJO6OM  
    { Il$Jj-)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8Oo16LPD  
     bProcessed=TRUE; nH|7XY9"  
    } %Q|Hvjk=E  
   } a<&GsDw  
  } "SU O2-Gj  
  else if((lParam&0xc000ffff)==1){ //有键按下 )%~<EJ*&Z  
   switch(wParam) $J]o\~Z J  
   { yQqu Gu  
    case VK_MENU: >?GCH(eW%  
     MaskBits|=ALTBIT; io*iA<@Gx  
     break; Dh .<&ri   
    case VK_CONTROL: 1D)=q^\I  
     MaskBits|=CTRLBIT; ?Z"<&tsZ  
     break; '<&rMn  
    case VK_SHIFT: VZr AZV^c  
     MaskBits|=SHIFTBIT; WS 1#i\0  
     break; .a `ojT  
    default: //judge the key and send message 2g%p9-MO]I  
     break;  $ 1v'CT  
   } "%K[kA6  
   for(int index=0;index<MAX_KEY;index++){ FuFA/R=x/  
    if(hCallWnd[index]==NULL) *hkNJ  
     continue; zl@hg<n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "[\),7&03  
    { iKEHwm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U].3vju`c  
     bProcessed=TRUE; zC_@wMWB  
    } "j?\Ze*  
   } nSB@xP#&  
  } JI|MR#_u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 td(4Fw||1y  
   for(int index=0;index<MAX_KEY;index++){ RV_+-m{]  
    if(hCallWnd[index]==NULL) i" >kF@]c8  
     continue; j~k+d$a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v42Z&PO   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L'<.#(|  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 d`4F  
   } I'%ASZ  
  } Mt%=z9OLq9  
 } lAo S 9w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ++Fk8R/$U[  
} 6}GcMhU<r  
.X{U\{c|a  
  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: aui3Mq#f  
Iz[wrtDI 1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bSS=<G9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OQh4 MN#$  
XJZS}Z7h  
  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: Ys@G0}\3G  
K1m'20U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _BBs{47{E  
{ $Ce;}sM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |TCg`ZS`cZ  
 { jT1^oXn@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BHJS.o*j~  
  SaveBmp(); e\' =#Hw  
  return FALSE; ^ /7L(  
 } )G@/E^ySM  
 …… //其它处理及默认处理 70yM]C^  
} |RZI]H%  
zOA2chy4  
d^^EfWU  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Z'o'd_g>I+  
e~NF}9#A  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 3Tz~DdB  
jt6,id)&  
  二、编程步骤 +<w\K*  
T{zz3@2?  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; yf2$HF  
p+; La  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }<g- 0&GLm  
y\c-I!6>26  
  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; <F-W fR  
_q3|Ddm2LN  
  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; 29r(Y  
=JfSg'7  
  5、 添加代码,编译运行程序。 Vl%jpjqP  
(v1~p3H  
三、程序代码 oO][X  
4 -Cca  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `rZS\A  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1$1P9x@H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :V^|}C#  
#if _MSC_VER > 1000 B),Z*lpC  
#pragma once {x<yDDIv_  
#endif // _MSC_VER > 1000 0:q R,NW^#  
#ifndef __AFXWIN_H__ xoyH5ZK@  
#error include 'stdafx.h' before including this file for PCH *{s 3.=P.  
#endif zE1=*zO`  
#include "resource.h" // main symbols ZA.i\ ;2  
class CHookApp : public CWinApp R>dd#`r"  
{ Vc$y ^|=  
 public: .Fm@OQr  
  CHookApp(); !TeI Jm/l  
  // Overrides R&9Q#n-  
  // ClassWizard generated virtual function overrides OGn-~ #E  
  //{{AFX_VIRTUAL(CHookApp) 4$_:a?9  
 public: p@jwHlX  
  virtual BOOL InitInstance(); "*Gp@  
  virtual int ExitInstance(); ~dlpoT  
  //}}AFX_VIRTUAL z 3N'Xk  
  //{{AFX_MSG(CHookApp) 52#Ac;Y  
  // NOTE - the ClassWizard will add and remove member functions here. L}\~)  
  // DO NOT EDIT what you see in these blocks of generated code ! jC_m0Iwc  
  //}}AFX_MSG c@/K}  
  DECLARE_MESSAGE_MAP() ^{l$>e]  
}; 3jDAj!_ea  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); y]b &3&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qs7*_=+h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x5%x""VEK  
BOOL InitHotkey(); G'f5MP 1  
BOOL UnInit(); C}Ucyzfr,p  
#endif .+$ox-EK8  
J ` KyS  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^Rc*X'Iz(!  
#include "stdafx.h" ~9DD=5\  
#include "hook.h" JpC_au7CX  
#include <windowsx.h> -mY,nMDb  
#ifdef _DEBUG 8KHT"uc'*J  
#define new DEBUG_NEW aYws{Vii  
#undef THIS_FILE @t4OpU<'*b  
static char THIS_FILE[] = __FILE__; C9L_`[9DO  
#endif !i5~>p|4@  
#define MAX_KEY 100 MyaJhA6c  
#define CTRLBIT 0x04 V3c7F4\  
#define ALTBIT 0x02 OS sYmF  
#define SHIFTBIT 0x01 DZqY=Sze  
#pragma data_seg("shareddata") vfloha p  
HHOOK hHook =NULL; pgEDh^[MW  
UINT nHookCount =0; NGVl/Qd  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey VQl(5\6O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,'&H`h54  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JUd Q Q  
static int KeyCount =0; y87oW_"h  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift xj;V  
#pragma data_seg() OmLe+,7'  
HINSTANCE hins; *:V+whBY  
void VerifyWindow(); Z,7VOf6g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 12HE =  
//{{AFX_MSG_MAP(CHookApp) <P.'r,"[  
// NOTE - the ClassWizard will add and remove mapping macros here. U *:E|'>  
// DO NOT EDIT what you see in these blocks of generated code! ]'5 G/H5?;  
//}}AFX_MSG_MAP 'ZAl7k .  
END_MESSAGE_MAP() Js/QL=,  
-T{G8@V0I  
CHookApp::CHookApp() "WZ|   
{ Hp5.jor(k  
 // TODO: add construction code here, 3o BR  
 // Place all significant initialization in InitInstance {.o@XP,.  
} 3{9d5p|\i  
}va>jfy  
CHookApp theApp; yoG*c%3V?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  4}F~h  
{ yZkS   
 BOOL bProcessed=FALSE; {3!E8~  
 if(HC_ACTION==nCode) t[o_!fmxZ  
 { '^%kTNn  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,)ZI&BL5  
   switch(wParam) r1/9BTPKdJ  
   { JsHD3  
    case VK_MENU: hO; XJyv  
     MaskBits&=~ALTBIT; &gsBbQ+qA  
     break; p> g[: ~  
    case VK_CONTROL: vW4n>h}]  
     MaskBits&=~CTRLBIT; OxqkpK&  
     break; Eo>EK>  
    case VK_SHIFT: {BzE  
     MaskBits&=~SHIFTBIT; il% u)NN  
     break; |H.ARLS  
    default: //judge the key and send message bXk(wXX  
     break; Dvm[W),(k  
   } |dhKeg_  
   for(int index=0;index<MAX_KEY;index++){ W_lXY Z<  
    if(hCallWnd[index]==NULL) N5.B"l  
     continue; sW@_' Lw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `G`y A%  
    { bX>R9i$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZdgzPs"  
     bProcessed=TRUE; nXw98;  
    } ||4T*B06  
   } '^M.;Giz  
  } g cb6*@u!  
  else if((lParam&0xc000ffff)==1){ //Key down qKTzigjj  
   switch(wParam) F}?4h Dt  
   { n j2=}6  
    case VK_MENU: -ARks_\  
     MaskBits|=ALTBIT; i!)\m0Wm  
     break; 0ZJj5<U  
    case VK_CONTROL: ($-m}UF\/  
     MaskBits|=CTRLBIT; 2P ^x'I  
     break; iFnD`l 6)  
    case VK_SHIFT: BhhFij4  
     MaskBits|=SHIFTBIT; xZA.<Yd^r  
     break; 1Eb2X}XC  
    default: //judge the key and send message b8E7/~<z3  
     break; Bk[C=<X  
   } k$ b)  
   for(int index=0;index<MAX_KEY;index++) 6ZfL-E{  
   { Kr;;aT0P  
    if(hCallWnd[index]==NULL)  hLj7i?  
     continue; +QNsI2t;r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V!/9GeIF  
    { */2nh%>$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~G 3txd  
     bProcessed=TRUE; 9BAvE\o0  
    } 8N \<o7t%  
   } i` Q&5KL  
  } ;8a9S0eS  
  if(!bProcessed){ T^vhhfCUr  
   for(int index=0;index<MAX_KEY;index++){ ;GIA`=a %  
    if(hCallWnd[index]==NULL) >wb Uxl%{5  
     continue; b0Dco0U(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RFoCM^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  ?tA%A  
   } f-p$4%(  
  } -iKoQkHt  
 } _ s*p$/V\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .><-XJ  
} -Aojk8tc  
Y&H<8ez  
BOOL InitHotkey() +lb&_eD  
{ kc(m.k!|f\  
 if(hHook!=NULL){ hfw+n<  
  nHookCount++; QiK-|hFj  
  return TRUE; a~ dgf:e`  
 } !o1IpTN  
 else 83 <CDjD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); HQ]mDo  
  if(hHook!=NULL) c0Pj})-  
   nHookCount++; qsQ{`E0  
  return (hHook!=NULL); bi^P k,'  
} Vl;zd=  
BOOL UnInit() 5z =}o/?  
{ k||dX(gl  
 if(nHookCount>1){ &>&6OV]P'  
  nHookCount--; [!4xInS  
  return TRUE; ?5J>]: +ZZ  
 } "YaT1` Kr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t<ZBp0  
 if(unhooked==TRUE){ ==Xy'n9'  
  nHookCount=0; Q-rG~O9-  
  hHook=NULL; g9fYt&  
 } U8J9 #+:  
 return unhooked; lrj&60R`w  
} bv VkN  
b $yIM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -DK6(<:0  
{ %P D}VF/Y  
 BOOL bAdded=FALSE; uVKe?~RC  
 for(int index=0;index<MAX_KEY;index++){ 9!FU,4 X  
  if(hCallWnd[index]==0){ KJ:z\N8eo  
   hCallWnd[index]=hWnd; yjsj+K pL  
   HotKey[index]=cKey; FSm.o?>  
   HotKeyMask[index]=cMask; Np%Q-T\  
   bAdded=TRUE; K_~kL0=4  
   KeyCount++; a"X h  
   break; r-go921  
  } l i)6^f#  
 } L""ZI5J{F9  
 return bAdded; J]#rh5um  
} Z,O* p,Gzn  
FzcXSKHV %  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0|.jIix;  
{ ^b$_I31D  
 BOOL bRemoved=FALSE; (qvH=VTwP  
 for(int index=0;index<MAX_KEY;index++){ Hqs!L`oW)  
  if(hCallWnd[index]==hWnd){ 9cHo~F|ur  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Rk7F;2  
    hCallWnd[index]=NULL; .{\eco  
    HotKey[index]=0; qdn_ ZE  
    HotKeyMask[index]=0; 9!(%Vf>  
    bRemoved=TRUE; }dpTR9j=  
    KeyCount--; !y B4;f$  
    break; Li]96+C$}  
   } ti (Hx  
  } 57EX#:a  
 } Le:C8^  
 return bRemoved; [^s;Ggi9  
} dW%t ph  
fLqjBG]<  
void VerifyWindow() 1Acs0` 3  
{ ?'Hd0)yZ  
 for(int i=0;i<MAX_KEY;i++){ LWm1j:0  
  if(hCallWnd!=NULL){ bm 4RRI  
   if(!IsWindow(hCallWnd)){ 2|=hF9  
    hCallWnd=NULL; 3qn_9f]  
    HotKey=0; B}[f]8jrM  
    HotKeyMask=0; 0&j90J$`  
    KeyCount--; 0FtwDM))  
   } zWhj >Za  
  } >mX6;6FF  
 }  5{oc  
} }oA>0Nw$K  
)WbWp4  
BOOL CHookApp::InitInstance() C1e@{>  
{ ]95VM yN  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `BKb60  
 hins=AfxGetInstanceHandle(); g(9*!g  
 InitHotkey(); uxB)dS  
 return CWinApp::InitInstance(); ~abyjM  
} X!K>.r_Dg  
`(h^z>%  
int CHookApp::ExitInstance() nAWb9Yk  
{ n0T|U  
 VerifyWindow(); ^h$*7u"^y  
 UnInit(); ]t~.?)Ad+2  
 return CWinApp::ExitInstance(); tiE|%jOzt  
} 5{k,/Z[L  
'E9{qPLk(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file # :k=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _%=CW' B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3a.!9R>  
#if _MSC_VER > 1000 \? )S {  
#pragma once erW2>^My  
#endif // _MSC_VER > 1000 V~[b`&F  
8 5X}CCQ  
class CCaptureDlg : public CDialog lUB?eQuN_  
{ &`@YdZtd"  
 // Construction 5RN!"YLI3  
 public: mf$YsvPq*+  
  BOOL bTray; YB7n}r23  
  BOOL bRegistered; j!>P7 8  
  BOOL RegisterHotkey(); OyVP_Yx,V  
  UCHAR cKey; Lo1ySLo$G  
  UCHAR cMask; ;W|NG3_y  
  void DeleteIcon(); XDJE]2^52?  
  void AddIcon(); 6T'UWh0S  
  UINT nCount; =DJ:LmK  
  void SaveBmp(); 4h@,hY1#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !(F?`([A  
  // Dialog Data Hz GwO^tbK  
  //{{AFX_DATA(CCaptureDlg) (O4oI U  
  enum { IDD = IDD_CAPTURE_DIALOG }; '*mZ/O-  
  CComboBox m_Key; QR#>Ws  
  BOOL m_bControl; K~vJ/9"|R  
  BOOL m_bAlt; e' o2PW  
  BOOL m_bShift; `6)Qi*Z  
  CString m_Path; %S;AM\o4  
  CString m_Number; < ,0D|O ,Y  
  //}}AFX_DATA ,M.}Qak^  
  // ClassWizard generated virtual function overrides o& FOp'  
  //{{AFX_VIRTUAL(CCaptureDlg) vvv'!\'#  
 public: N'VTdf?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); m6mGcbpn  
 protected: m%`YAD@2z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uL^; i""  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &|{1Ws  
  //}}AFX_VIRTUAL cl4z%qv*  
  // Implementation aE5-b ub c  
 protected: F1stRZ1ZI  
  HICON m_hIcon; "ktuq\a@  
  // Generated message map functions I{cH$jt<  
  //{{AFX_MSG(CCaptureDlg) NUYKMo1ze  
  virtual BOOL OnInitDialog(); G-T^1?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); * ) <+u~  
  afx_msg void OnPaint(); 8F8?1  
  afx_msg HCURSOR OnQueryDragIcon(); o'$"MC+  
  virtual void OnCancel(); ]6^<VC`5D  
  afx_msg void OnAbout(); {IJ;)<>&VE  
  afx_msg void OnBrowse(); "u7[[.P)  
  afx_msg void OnChange(); GLtd<M"  
 //}}AFX_MSG H_ $?b  
 DECLARE_MESSAGE_MAP() 8l5>t  
}; 9y*] {IY  
#endif dYrgL3'  
ud `- w  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]##aAh-P4&  
#include "stdafx.h" hU""YP ~y  
#include "Capture.h" *uyP+f2O  
#include "CaptureDlg.h" # -luE  
#include <windowsx.h> ^qR|lA@=\  
#pragma comment(lib,"hook.lib") 4n1g4c-   
#ifdef _DEBUG _M`ZF*o=c  
#define new DEBUG_NEW :,0(aB  
#undef THIS_FILE ~r.R|f]IQ  
static char THIS_FILE[] = __FILE__; (L*GU7m;  
#endif jXE:aWQht  
#define IDM_SHELL WM_USER+1 Y 3ApW vS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !{.CGpS ]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {1OxJn1hd  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $o?U=  
class CAboutDlg : public CDialog jG[Vp b  
{ 6/8K2_UeoW  
 public: (NvjX})eh  
  CAboutDlg(); v;<gCzqQh  
  // Dialog Data ;bB#P g  
  //{{AFX_DATA(CAboutDlg) }CBQdH&g;  
  enum { IDD = IDD_ABOUTBOX }; ?z9!=A%<V~  
  //}}AFX_DATA "V>}-G&  
  // ClassWizard generated virtual function overrides %i9 e<.Ot  
  //{{AFX_VIRTUAL(CAboutDlg) |MZ1j(_  
 protected: T ?[28|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1 jidBzu<  
  //}}AFX_VIRTUAL BI`)P+K2  
  // Implementation 58s-RO6  
 protected: ,~d0R4)  
  //{{AFX_MSG(CAboutDlg) N@c G jpQ  
  //}}AFX_MSG +-<G(^  
  DECLARE_MESSAGE_MAP() <}RI<96  
}; n>ui'}L  
TF/NA\0c$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U*r54AyP  
{ 7{F\b  
 //{{AFX_DATA_INIT(CAboutDlg) R!j#  
 //}}AFX_DATA_INIT OZxJDg  
} >)ekb7  
q~R8<G%YK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) OS,!`8cw  
{ vdq=F|&  
 CDialog::DoDataExchange(pDX); \l:R]:w;ZI  
 //{{AFX_DATA_MAP(CAboutDlg) <==uK>pET  
 //}}AFX_DATA_MAP :'DyZy2Fd  
} l/G +Xj4M  
dxs5woP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %VO+\L8Fs  
 //{{AFX_MSG_MAP(CAboutDlg) 'Bue*  
 // No message handlers h:8P9WhWF  
 //}}AFX_MSG_MAP N55F5  
END_MESSAGE_MAP() :VT%d{Vp_  
9!_,A d;3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !XtG6ON=  
: CDialog(CCaptureDlg::IDD, pParent) r1r$y2v~  
{ ?wB_fDb}  
 //{{AFX_DATA_INIT(CCaptureDlg) 3}H{4]*%_  
  m_bControl = FALSE; ;_bRq:!j;  
  m_bAlt = FALSE; Uqel UL}  
  m_bShift = FALSE; wb.yGfJ  
  m_Path = _T("c:\\"); j?N<40z  
  m_Number = _T("0 picture captured."); U4!KO;Jc  
  nCount=0; >.Gmu  
  bRegistered=FALSE; uBRlvNJ  
  bTray=FALSE; _c>ww<*3  
 //}}AFX_DATA_INIT B r#{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k77IXT_7u  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OvX&5Q5  
} {nKw<F2  
:|W=2( >  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z}MxMx c4h  
{ M1/d7d  
 CDialog::DoDataExchange(pDX); OeqKKVuQ  
 //{{AFX_DATA_MAP(CCaptureDlg) inGUN??  
  DDX_Control(pDX, IDC_KEY, m_Key); . }\8Y=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *K|~]r(F?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u}nSdZC  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %/Wk+r9uu  
  DDX_Text(pDX, IDC_PATH, m_Path); s:tX3X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Z<.&fZ^jS  
 //}}AFX_DATA_MAP \\dUp>1=  
} `7=$I~`  
Am F[#)90P  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vu+g65"  
//{{AFX_MSG_MAP(CCaptureDlg) Ah2 {kK  
 ON_WM_SYSCOMMAND() &gp&i?%X9b  
 ON_WM_PAINT() i{6&/TBnr  
 ON_WM_QUERYDRAGICON() Vg NB^w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) L/ 7AGR|;C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @ual+=L  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y u'-'{%  
//}}AFX_MSG_MAP 4 Im>2 )  
END_MESSAGE_MAP() R&Lqaek&W  
mWv$eR  
BOOL CCaptureDlg::OnInitDialog() E]mm^i`|  
{ |cU75 S1  
 CDialog::OnInitDialog(); C<D$Y,[w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); o`iA&  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,\6Vb*G|E>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @}4aF|  
 if (pSysMenu != NULL) P2'N4?2  
 { (mIjG)4t  
  CString strAboutMenu; p]mN)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {mJ' Lb0;  
  if (!strAboutMenu.IsEmpty()) r:bJU1P1$s  
  { qofAA!3z  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z5v dH5?!r  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6B?jc/V.R  
  } N9!L8BBaK  
 } VM%g QOo<  
 SetIcon(m_hIcon, TRUE); // Set big icon t+U.4mS-  
 SetIcon(m_hIcon, FALSE); // Set small icon KZ%i&w#<  
 m_Key.SetCurSel(0); |]9@JdmV  
 RegisterHotkey();  T01Iu  
 CMenu* pMenu=GetSystemMenu(FALSE); OIPY,cj~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u!K1K3T6k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FoetP`   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 01'>[h#_n  
 return TRUE; // return TRUE unless you set the focus to a control MDlH[PJ@i  
} M.Yp'Av  
u#Ig!7iUu  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ooVs8T2  
{ I> ;{BYPV  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) yJI~{VmU7  
 { 3=d%WPgQ  
  CAboutDlg dlgAbout; +4:eb)e  
  dlgAbout.DoModal(); e#*3X4<\K  
 } (xb2H~WrN  
 else _f^6F<!  
 { lEHx/#qt9  
  CDialog::OnSysCommand(nID, lParam); *6?mZ*GYY  
 }  i"<W6  
} (\F9_y,6*\  
1b%Oi.;  
void CCaptureDlg::OnPaint() (I~   
{ n[Q(q[ULV  
 if (IsIconic()) r-y;"h'  
 { /wLBmh1"  
  CPaintDC dc(this); // device context for painting x@OBGKV  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rQ.zqr  
  // Center icon in client rectangle o-=|}u]mz  
  int cxIcon = GetSystemMetrics(SM_CXICON); f8;?WSGyD2  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8'*x88+  
  CRect rect; z,aMbgt  
  GetClientRect(&rect); "SMJ:g",  
  int x = (rect.Width() - cxIcon + 1) / 2; t$$YiO  
  int y = (rect.Height() - cyIcon + 1) / 2; bny5e:= d  
  // Draw the icon !Aj}sh{  
  dc.DrawIcon(x, y, m_hIcon); >Hnm.?-AWl  
 } f]r*;YEc4  
 else ;}E}N:A  
 { un 5r9  
  CDialog::OnPaint(); 1'o[9-  
 } T_S3_-|{==  
} v*!N}1+J  
K) }1;  
HCURSOR CCaptureDlg::OnQueryDragIcon() WAxNQfEe  
{ X<,QSTP  
 return (HCURSOR) m_hIcon; }[akj8U  
} 'JOCL0FP  
gO8d2?Oh  
void CCaptureDlg::OnCancel() BzfR8mD  
{ _ dAyw  
 if(bTray) $BdwKk !k  
  DeleteIcon(); uA#K59E+  
  CDialog::OnCancel(); [\W&  
} 4H6Fq*W{k  
M[`[+5v  
void CCaptureDlg::OnAbout() A&M_ J  
{ `0qjaC  
 CAboutDlg dlg; ui>jJ(  
 dlg.DoModal(); Kzrd<h]`)  
} uP* kvi:e  
RxqNgun@  
void CCaptureDlg::OnBrowse() )c4tGT<  
{ YD[HBF)~j  
 CString str; 5[4wN( )  
 BROWSEINFO bi; qHub+"2  
 char name[MAX_PATH]; vi}16V84l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Ca'BE#q  
 bi.hwndOwner=GetSafeHwnd(); Ro]Z9C>1o  
 bi.pszDisplayName=name; dNgA C){w  
 bi.lpszTitle="Select folder"; +bE{g@%@ +  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %4LoEm=U  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); KyNu8s k  
 if(idl==NULL) K[icVT2v~  
  return; + Tp% *  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lMFo)4&P  
 str.ReleaseBuffer(); K? o p3}f?  
 m_Path=str; |aP`hVm  
 if(str.GetAt(str.GetLength()-1)!='\\') ;d}>8w&tfy  
  m_Path+="\\"; Z4i))%or  
 UpdateData(FALSE); EsKgS\`RZ  
} hV(^Y)f  
Z;G*wM"  
void CCaptureDlg::SaveBmp() F- -g?Q^  
{ D>y5&`  
 CDC dc; @/ ^< 9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8r(a wp  
 CBitmap bm; "Ol:ni1  
 int Width=GetSystemMetrics(SM_CXSCREEN); zwV!6xG  
 int Height=GetSystemMetrics(SM_CYSCREEN); \ UrD%;sq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 08xo_Oysq  
 CDC tdc; ?XY'<]o E  
 tdc.CreateCompatibleDC(&dc); KdkL_GSLT  
 CBitmap*pOld=tdc.SelectObject(&bm); U3N d\b'0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7<)H?;~;  
 tdc.SelectObject(pOld); S'!&,Dxq^  
 BITMAP btm; \(pwHNSafk  
 bm.GetBitmap(&btm); > '=QBW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ![%wM Pp  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c[ZrQJ  
 BITMAPINFOHEADER bih; [e` | <  
 bih.biBitCount=btm.bmBitsPixel; D \i]gfu8W  
 bih.biClrImportant=0; :4zu.  
 bih.biClrUsed=0; }B'-*)^|e{  
 bih.biCompression=0; %/uLyCUZ  
 bih.biHeight=btm.bmHeight; Kzn1ct{65!  
 bih.biPlanes=1; Zp/+F(  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]_(hUj._  
 bih.biSizeImage=size; Bug.>ln1  
 bih.biWidth=btm.bmWidth; G{[w+ObX  
 bih.biXPelsPerMeter=0; _G'ki.[S7  
 bih.biYPelsPerMeter=0; 82@^vX  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?7Cm+J  
 static int filecount=0; >>T7;[h  
 CString name; jVnTpa!A  
 name.Format("pict%04d.bmp",filecount++); 8vuTF*{yZ  
 name=m_Path+name; o6A$)m5V  
 BITMAPFILEHEADER bfh; hM]Z T5;<  
 bfh.bfReserved1=bfh.bfReserved2=0; H/{@eaV  
 bfh.bfType=((WORD)('M'<< 8)|'B'); y^ skE{  
 bfh.bfSize=54+size; /C8}5)  
 bfh.bfOffBits=54; zd5=W"Y;]  
 CFile bf; F2 B(PGa7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ gfK_g)'2U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); a"-uJn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XnP?hw%  
  bf.WriteHuge(lpData,size); Z5v_- +K  
  bf.Close(); 8p 4[:M@  
  nCount++; 1*p6UR&  
 } = z mxki  
 GlobalFreePtr(lpData); >fYcr#i0[  
 if(nCount==1) (H uvo9  
  m_Number.Format("%d picture captured.",nCount); fJ8>nOh  
 else Q`*U U82!  
  m_Number.Format("%d pictures captured.",nCount); <5G(Y#s/?  
  UpdateData(FALSE); )f$4: Pq  
} L6CI9C;-b  
bIGcszWr  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -m}'I8  
{ ?'~u)O(n  
 if(pMsg -> message == WM_KEYDOWN) 68P'<|u?  
 { (qFZF7(Xa  
  if(pMsg -> wParam == VK_ESCAPE) Lan|(!aW  
   return TRUE; t)j$lmQn  
  if(pMsg -> wParam == VK_RETURN) MxpAh<u!vF  
   return TRUE; n>pJ/l%`  
 } E@C.}37R  
 return CDialog::PreTranslateMessage(pMsg); :oy2mi;  
} G4c@v1#%.  
*KNfPh#wi}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9~`#aQG T  
{ BeFyx"NBg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ bhpaC8|  
  SaveBmp(); iN8[^,2H|  
  return FALSE; ZY8.p  
} )!0}<_2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I;rW!Hb  
 CMenu pop; B0yJ9U= Fj  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SAq .W"ri  
 CMenu*pMenu=pop.GetSubMenu(0); 8TpYt)]S  
 pMenu->SetDefaultItem(ID_EXITICON); ((`\i=-o5  
 CPoint pt; Z&>Cdgt*  
 GetCursorPos(&pt); ?u#s?$Y?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K9ia|2f  
 if(id==ID_EXITICON) m Z +dr[  
  DeleteIcon(); EHq; eF  
 else if(id==ID_EXIT) ]*=!lfrV  
  OnCancel(); KH)-=IJ8  
 return FALSE; ?ja%*0 R  
} o*A, 6y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l| uiC%T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Njg87tKB  
 AddIcon(); K/B$1+O  
 return res; [_%u5sc-y  
} Iq%<E:+GL  
$yi:0t8t  
void CCaptureDlg::AddIcon() G0!6rDu2,  
{ H_@6!R2  
 NOTIFYICONDATA data; DNZ,rL:h  
 data.cbSize=sizeof(NOTIFYICONDATA); b4wT3  
 CString tip; 445JOP  
 tip.LoadString(IDS_ICONTIP); M-].l3  
 data.hIcon=GetIcon(0); :q3w;B~  
 data.hWnd=GetSafeHwnd(); 3:Nc`tM_  
 strcpy(data.szTip,tip); 3PvxU|*F  
 data.uCallbackMessage=IDM_SHELL; U;iCH  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; I`oJOLV  
 data.uID=98; d1_kw A2y  
 Shell_NotifyIcon(NIM_ADD,&data); MJX4;nbl  
 ShowWindow(SW_HIDE); ??aO3Vm{  
 bTray=TRUE; QlvP[Jtr  
} BPv+gx(>k  
Pqx?0 f)  
void CCaptureDlg::DeleteIcon() jY\z+lW6A  
{ >{ {ds--  
 NOTIFYICONDATA data; t0fgG/f'  
 data.cbSize=sizeof(NOTIFYICONDATA); mCt/\  
 data.hWnd=GetSafeHwnd(); q}p$S2`  
 data.uID=98; _O}U4aGMTC  
 Shell_NotifyIcon(NIM_DELETE,&data); ? ch?q~e)  
 ShowWindow(SW_SHOW); oU,8?( }'~  
 SetForegroundWindow(); 9O&m7]3  
 ShowWindow(SW_SHOWNORMAL); z*.G0DFw  
 bTray=FALSE; 423%K$710  
} , poc!n//  
]#4kqj}  
void CCaptureDlg::OnChange() q !9;JrX  
{ 00D.Jn  
 RegisterHotkey(); VDOC>  
} 4tUoK[p  
9=$ pV==  
BOOL CCaptureDlg::RegisterHotkey() JAKs [@:  
{ 3mofp`e  
 UpdateData(); nygGI_[l  
 UCHAR mask=0; HD#>K 7  
 UCHAR key=0; ;39a`  
 if(m_bControl) (KN",u6F  
  mask|=4; jNx{*2._r  
 if(m_bAlt) $k )K}U  
  mask|=2; kF'9@*?J  
 if(m_bShift) qbSI98r w  
  mask|=1; g$C]ln>"9m  
  key=Key_Table[m_Key.GetCurSel()]; } *) l  
 if(bRegistered){ N`7OJ)l  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e;~(7/1  
  bRegistered=FALSE; c.1gQy$}|  
 } JE{ cZ<NNH  
 cMask=mask; *YH!L{y  
 cKey=key; ):4)8@]5M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x`+M#A()/  
 return bRegistered; 5"40{3  
} q&[G^9  
i[LnU#+  
  四、小结 ~M* UMF^  
yuC$S&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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