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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: IY&a!  
  "gz;Q  
  一、实现方法 >R<fm  
[C6?:'}FA  
  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: \zUsHK?L"t  
NC}#P< U  
#pragma data_seg("shareddata") u| c+w)a  
HHOOK hHook =NULL; //钩子句柄 -Me\nu8(RF  
UINT nHookCount =0; //挂接的程序数目 ;=OH=+R l  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5PPpX=\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 oX~CTunP  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey wW4S@m  
static int KeyCount =0; &?nF' ;&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1^3#3duV  
#pragma data_seg() S8VR#  
A@OV!DJe]  
  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。 1c!},O  
~}*;Ko\  
  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: xTMTkVa+B  
[)A#9L~s=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fLAF/#\2  
cKey,UCHAR cMask) 2LU'C,o?  
{ P>-,6a>  
 BOOL bAdded=FALSE; $EIkk= z  
 for(int index=0;index<MAX_KEY;index++){ D,/9rH  
  if(hCallWnd[index]==0){ }TW=eu~  
   hCallWnd[index]=hWnd; s_LSs yqo  
   HotKey[index]=cKey; A\)X&vR[6  
   HotKeyMask[index]=cMask; 3#[I _  
   bAdded=TRUE; YP,PJnJU8  
   KeyCount++; t^5_;sJQ  
   break; 6pR#z@,  
  } $@)d9u cd  
 } HV.7IyBA^  
 return bAdded; X;:xGZ-oY  
} 3)a29uc:U  
//删除热键 ltR^IiA}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <4,?lZ  
{ ]w>fnew  
 BOOL bRemoved=FALSE; N sL"p2w~  
 for(int index=0;index<MAX_KEY;index++){ uw!|G>  
  if(hCallWnd[index]==hWnd){ df& |Lc1J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~x:] ch|  
    hCallWnd[index]=NULL; -; $/<  
    HotKey[index]=0; =1 \wZuK#  
    HotKeyMask[index]=0; $lA,{Q  
    bRemoved=TRUE; )g _zPt  
    KeyCount--; ^E17_9?  
    break; ,IE0+!I  
   } di2=P)3  
  } /g''-yT7#  
 } ASw |sw  
 return bRemoved; Zd ,=  
} V bOLTc  
RfG$Px '  
9AzGk=^  
  DLL中的钩子函数如下: ,r;d{  
VYo;[ue([  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dy?|Q33Y"  
{ Cl!jK^AbG  
 BOOL bProcessed=FALSE; wt S*w  
 if(HC_ACTION==nCode) ,&] ` b#Rc  
 { V JL;+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t}*!UixE  
   switch(wParam) (t$/G3E  
   {  cV,Dl`1r  
    case VK_MENU: 1C=P#MU`  
     MaskBits&=~ALTBIT; FSs$ ] d;  
     break; &Ld8Z9IeFp  
    case VK_CONTROL: WI_mJ/2  
     MaskBits&=~CTRLBIT; ]_8I_V cQ  
     break; `0|&T;7  
    case VK_SHIFT: L$ Ar]O)  
     MaskBits&=~SHIFTBIT; J6D$ i+  
     break; -U[`pUY?f  
    default: //judge the key and send message Fjt,  
     break; #`0z=w/)  
   } TR_oI<xB2  
   for(int index=0;index<MAX_KEY;index++){ l>Ja[`X@  
    if(hCallWnd[index]==NULL) ':)j@O3-  
     continue; PJ:5Lb<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $ywh%OEH  
    { b2%bgs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]},Q`n>$  
     bProcessed=TRUE; y7EX&  
    } 1e&b;l'*=  
   } ![ID0}MjJ  
  } 14!a)Ijl  
  else if((lParam&0xc000ffff)==1){ //有键按下 9k[},MM  
   switch(wParam) @i-@mxk6<  
   { vqz#V=J{  
    case VK_MENU: -01 1U!  
     MaskBits|=ALTBIT; 0P3|1=  
     break; @ aN=U=  
    case VK_CONTROL: +{i "G,3  
     MaskBits|=CTRLBIT; ef:$1VIBda  
     break; ]G~N+\8]U  
    case VK_SHIFT: QYw4kD}  
     MaskBits|=SHIFTBIT;  >E ;o"  
     break; edk9Qd9  
    default: //judge the key and send message 8;f<qu|w  
     break; <sYw%9V  
   } 7C7(bg,7^  
   for(int index=0;index<MAX_KEY;index++){  / !  
    if(hCallWnd[index]==NULL) {&u7kWD|  
     continue; !_H8Q}a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |SukiXJZF  
    { f<4q]HCa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )X!DCL:16  
     bProcessed=TRUE; | 4oM+n;Y  
    } _QUu'zJ  
   } \If!5N  
  } u+'@>%7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -L3 |9k  
   for(int index=0;index<MAX_KEY;index++){ pXj/6+^  
    if(hCallWnd[index]==NULL) Q*&aC|b&  
     continue; I+j|'=M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fZ~kw*0*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .P :f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 EJ;0ypbG  
   } n.6 0$kR`  
  } U2>dwn  
 } Fif^V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h)l&K%4;  
} qb&N S4#  
eTRx6Fri(  
  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: <Bb<?7q$ld  
n5* {hi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Fp6[W5>(-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +'Y( V&  
+6M+hO]  
  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: 0H&U=9'YT  
XvkI +c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d7tD|[(J  
{ SAE '?_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cvXI]+`<3\  
 { +s(IQt  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q'Kik5I  
  SaveBmp(); dIfs 8%kl  
  return FALSE; 6|>\&Y!Q  
 } 9H, &nET  
 …… //其它处理及默认处理 &G@-yQ  
} :n>ccZeMv  
h[ZN >T  
A;WwS?fyQ  
  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。 [T[9*6Kt  
6:@t=C  
  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。  e(;`9T  
'UvS3]bSYW  
  二、编程步骤 @wdB%  
qzlMn)e  
  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"; zhX`~){N6  
HMS9y%zl/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :OQ:@Yk  
$,QpSK`9i  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; E4v_2Q -w  
ic0v*Y$  
  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; IL>/PuZku  
,F`KQ )\"  
  5、 添加代码,编译运行程序。 |`Oa/\U  
Y9@dZw%2  
三、程序代码 Ij6Wz. *  
_]D#)-uv}C  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /@:up+$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C/CfjRzd  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ d7_g u  
#if _MSC_VER > 1000 ZP6 3Alt  
#pragma once *e-ptgO  
#endif // _MSC_VER > 1000 |1QbO`f/F  
#ifndef __AFXWIN_H__ A M1C $  
#error include 'stdafx.h' before including this file for PCH Id.Z[owC`Y  
#endif Dd5xXs+c  
#include "resource.h" // main symbols Hr<C2p^a  
class CHookApp : public CWinApp J%\~<_2ny  
{ 16[-3cJ T  
 public: -#S)}N En  
  CHookApp(); C7jc6(> m  
  // Overrides yK&* ,J |  
  // ClassWizard generated virtual function overrides Z4HA94  
  //{{AFX_VIRTUAL(CHookApp) 2 %{YYT   
 public: "Ql}Y1  
  virtual BOOL InitInstance(); i (%tHa37  
  virtual int ExitInstance(); &weY8\HD  
  //}}AFX_VIRTUAL znQ'm^h  
  //{{AFX_MSG(CHookApp) e:$7^Y,U/  
  // NOTE - the ClassWizard will add and remove member functions here. 'Wf?elB+  
  // DO NOT EDIT what you see in these blocks of generated code ! I NPYJ#%  
  //}}AFX_MSG ^)hAVf~E  
  DECLARE_MESSAGE_MAP() }#ep}h  
}; #j^('K|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >9.5-5"   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wiq{wxe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0j{F^rph  
BOOL InitHotkey(); joChML_  
BOOL UnInit(); O/D Af|X|  
#endif mZbWRqP[|_  
cZDxsd]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9RCO|J  
#include "stdafx.h" %R.xS} Q  
#include "hook.h" @ kJ0K  
#include <windowsx.h> w*<Y$hnBzF  
#ifdef _DEBUG [:nx);\  
#define new DEBUG_NEW >k&8el6h  
#undef THIS_FILE Q$|^~  
static char THIS_FILE[] = __FILE__; R,x>$n  
#endif GP[6nw_'^  
#define MAX_KEY 100 <DeKs?v  
#define CTRLBIT 0x04 Ue{vg$5||  
#define ALTBIT 0x02 2/yXY_L  
#define SHIFTBIT 0x01 e$Xq    
#pragma data_seg("shareddata") C5PmLiOHY>  
HHOOK hHook =NULL; 4-7kS85  
UINT nHookCount =0; d)04;[=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fjIcB+Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _e?q4>B)c  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]DC;+;8Jc  
static int KeyCount =0; \);.0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift VX^o"9Ntl  
#pragma data_seg() 4pmTicA~  
HINSTANCE hins; jFuC=6aF  
void VerifyWindow(); ]g;^w?9h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J+)'-OFt0  
//{{AFX_MSG_MAP(CHookApp) MvFM ,  
// NOTE - the ClassWizard will add and remove mapping macros here. J$#h( D%  
// DO NOT EDIT what you see in these blocks of generated code! &jV9*  
//}}AFX_MSG_MAP ?~"`^|d  
END_MESSAGE_MAP() ^w:OS5%R  
0W T#6D  
CHookApp::CHookApp() *M> iZO*@  
{ c Ndw9?Z  
 // TODO: add construction code here, .7 (DxN  
 // Place all significant initialization in InitInstance V&Xi> X8  
} y4xT:G/M  
E /fw?7eQ  
CHookApp theApp; 4GG1E. z}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SXRdNPXFO  
{ <91t`&aWW  
 BOOL bProcessed=FALSE; *2JH_Cj`  
 if(HC_ACTION==nCode) le7 `uz!%  
 { ?xtt7*'D  
  if((lParam&0xc0000000)==0xc0000000){// Key up kAZC"qM%i  
   switch(wParam) R* s* +I  
   { V#ndyUM;  
    case VK_MENU: xT9Yes&  
     MaskBits&=~ALTBIT; b!i`o%Vb  
     break; u.Mqj"o\  
    case VK_CONTROL: c%|vUAq*  
     MaskBits&=~CTRLBIT; cI*KRC U  
     break; )Vwj9WD  
    case VK_SHIFT: S5i+vUI8C  
     MaskBits&=~SHIFTBIT; n K+lE0  
     break; n?'d|h  
    default: //judge the key and send message rr|"r  
     break; z 0~j  
   } x}tKewdOSe  
   for(int index=0;index<MAX_KEY;index++){ <jbj/Q )"  
    if(hCallWnd[index]==NULL) Wgxn`6  
     continue; /Zo~1q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P3'2IzNw  
    { +"]oc{W!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Zxg1M  
     bProcessed=TRUE; `kv1@aQPL  
    } 9*#$0Y=  
   } m)s xotgXf  
  } <"* "1(wN  
  else if((lParam&0xc000ffff)==1){ //Key down ZhH+D`9  
   switch(wParam) mfXD1]<.  
   { `.{U-U\  
    case VK_MENU: ; D1FAz  
     MaskBits|=ALTBIT; 5a'yXB}  
     break; yh S#&)O  
    case VK_CONTROL: WK pUn8&N  
     MaskBits|=CTRLBIT; /&CUspb  
     break; CV'&4oq  
    case VK_SHIFT: *"1~bPl  
     MaskBits|=SHIFTBIT; ; ;<J x.  
     break; l`SK*Bm~<  
    default: //judge the key and send message ./$ <J6-J  
     break; q1H=/[a  
   } 53B.2 4Tm  
   for(int index=0;index<MAX_KEY;index++) EPc!p>  
   { YzVN2f!n  
    if(hCallWnd[index]==NULL) "37*A<+f  
     continue; +H7y/#e+3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /:U1!9.y  
    {  AlO,o[0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YU&4yk lE  
     bProcessed=TRUE; Ig<}dM.Z[  
    } '<TD6jBs  
   } 9oEpPL5  
  } |Eb&}m:E$  
  if(!bProcessed){ xJ-*%'(KZ  
   for(int index=0;index<MAX_KEY;index++){ UmJUt|  
    if(hCallWnd[index]==NULL) Zp`~}LV{  
     continue; My. dD'C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C1 W>/?XC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d7E7f  
   } djUihcqA`  
  } lqF>=15  
 } ~L~]QN\3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [q'eEN G  
} v{o? #Sk1  
g^jJ8k,7(  
BOOL InitHotkey() ~]&B >q  
{ dsV ~|D6:  
 if(hHook!=NULL){ 7R: WX:  
  nHookCount++;  ozU2  
  return TRUE; [eyb7\#   
 } V"O 9n[|  
 else H.:9:I[n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); KGu= ;  
  if(hHook!=NULL) `qE4U4  
   nHookCount++; J;~E<_"Hn  
  return (hHook!=NULL); N r<9u$d9=  
} TFO74^  
BOOL UnInit() i-b1d'?Rb  
{ CJp-Y}fGEA  
 if(nHookCount>1){ ZPl PN;J^1  
  nHookCount--; Tw x{' S  
  return TRUE; H<,bq*@  
 } hcyn  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }wfI4?}j}  
 if(unhooked==TRUE){ ^p,3)$  
  nHookCount=0; 2 l(Dee Y  
  hHook=NULL; Xtkw Z3  
 } 8)pB_en3sO  
 return unhooked; L?HF'5o  
} `_GO=QQ  
YZ< NP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7aQ n;  
{ 6GzzG P^  
 BOOL bAdded=FALSE; ojoxXly`  
 for(int index=0;index<MAX_KEY;index++){ `gI~|A4  
  if(hCallWnd[index]==0){ !N1J@LT5h  
   hCallWnd[index]=hWnd; SiV*WxQe  
   HotKey[index]=cKey; VG)="g[%)  
   HotKeyMask[index]=cMask; uJY.5w  
   bAdded=TRUE; =5ug\S  
   KeyCount++; 2SciB*5  
   break; ;, rnk-  
  } d@ZoV  
 } /ERNS/w  
 return bAdded; Zi/-~')E  
} 6 Uw;C84!  
z?kd'j`FG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uf]Y^,2  
{ T`?n,'!(  
 BOOL bRemoved=FALSE; Y%g "Y  
 for(int index=0;index<MAX_KEY;index++){ b/nOdFO@  
  if(hCallWnd[index]==hWnd){ '00J~j~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j;iL&eo>  
    hCallWnd[index]=NULL; 4 \ F P  
    HotKey[index]=0; 0wFh%/:  
    HotKeyMask[index]=0; 6.'$EtH  
    bRemoved=TRUE; y"-{$N  
    KeyCount--; b =b :  
    break; VhvTBo<cw  
   } 4UD' %}>y  
  } .E$q&7@/j  
 } 2h )8Fq_"  
 return bRemoved; BSKEh"f  
} skR,-:"8  
RM,'o[%  
void VerifyWindow() >rw"Rd'  
{ nLJBq)i  
 for(int i=0;i<MAX_KEY;i++){ ~C| ,b"  
  if(hCallWnd!=NULL){ ,d cg?48  
   if(!IsWindow(hCallWnd)){ )b92yP{  
    hCallWnd=NULL; E eB3 }  
    HotKey=0; $)*xC!@6X  
    HotKeyMask=0; '#H")i  
    KeyCount--; \XS]N_}8>  
   } RdI} ;K  
  } lsY `c"NW>  
 } l3p3tT3+  
} kOipH |.x  
dE [Ol   
BOOL CHookApp::InitInstance() 2 .f|2:I  
{ 9"ugz^uKt  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AS|Rd+ .  
 hins=AfxGetInstanceHandle(); h<% U["   
 InitHotkey(); ~<,Sh~Ana.  
 return CWinApp::InitInstance(); l.oBcg[  
} -B 9S}NPo  
q- :4=vkn  
int CHookApp::ExitInstance() yW("G-Nm  
{ dB3N%pB^  
 VerifyWindow(); j#3m|dQ  
 UnInit(); TQJF+;%  
 return CWinApp::ExitInstance(); }g{_AiP rv  
} 2y kCtRe  
9p`r7:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file JIxiklk  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) M&yqfb[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lzDdD3Ouc  
#if _MSC_VER > 1000 ]"sRS`0+  
#pragma once v[&'k\  
#endif // _MSC_VER > 1000 ,I`_F,  
^|?1_r  
class CCaptureDlg : public CDialog ?3jdg]&  
{ HO5d%85  
 // Construction a$m_D!b~_  
 public: Yy h=G  
  BOOL bTray; [Oy >R  
  BOOL bRegistered; FT.@1/)  
  BOOL RegisterHotkey(); ~`R1sSr"  
  UCHAR cKey; qq;b~ 3 kW  
  UCHAR cMask; zvr\36  
  void DeleteIcon(); yX! #a>d"H  
  void AddIcon(); (Es{la G  
  UINT nCount; /U*yw5  
  void SaveBmp(); rk,p!}FqL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2 B` 8eb  
  // Dialog Data V]c5 Z$Bd  
  //{{AFX_DATA(CCaptureDlg) ]XUSqai  
  enum { IDD = IDD_CAPTURE_DIALOG }; l1<?ONB.#  
  CComboBox m_Key; GwQn;gkF  
  BOOL m_bControl; $]*d#`Sy{%  
  BOOL m_bAlt; ~/|zlu*jpc  
  BOOL m_bShift; _tj&Psp  
  CString m_Path; gs`> C(  
  CString m_Number; [5Y<7DS  
  //}}AFX_DATA <&U!N'CE  
  // ClassWizard generated virtual function overrides (WE,dY+.  
  //{{AFX_VIRTUAL(CCaptureDlg) }-p,iTm  
 public: zu<3^=3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @^? XaU  
 protected: YwAnqAg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kon=il<@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ei~f`{i  
  //}}AFX_VIRTUAL QlD6i-a  
  // Implementation ~lw<799F6  
 protected: ow.j+ <M  
  HICON m_hIcon; oT3Y!Y3=<  
  // Generated message map functions #C\4/g? =,  
  //{{AFX_MSG(CCaptureDlg) Jqru AW<  
  virtual BOOL OnInitDialog(); >Z\BfH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]a/'6GbR  
  afx_msg void OnPaint(); GZ8:e3ri  
  afx_msg HCURSOR OnQueryDragIcon(); 4;*f1_;f~  
  virtual void OnCancel(); %-j&e44  
  afx_msg void OnAbout(); gj+3y9  
  afx_msg void OnBrowse(); L'9N9CR{i  
  afx_msg void OnChange(); *IZf^-=Q  
 //}}AFX_MSG HarFE4V  
 DECLARE_MESSAGE_MAP() (p |DcA]BX  
}; h\y-L~2E  
#endif ut5yf$%  
BXhWTGiG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8R xc&`_X  
#include "stdafx.h" #J$qa Ul  
#include "Capture.h" M!{'ED  
#include "CaptureDlg.h" >5Lexj  
#include <windowsx.h> SI*^f\lu  
#pragma comment(lib,"hook.lib") < y>:B}9'  
#ifdef _DEBUG )i!^]|$   
#define new DEBUG_NEW PayV,8   
#undef THIS_FILE Fe$/t(  
static char THIS_FILE[] = __FILE__; @ls.&BHUP  
#endif jO)&KEh  
#define IDM_SHELL WM_USER+1  r(`nt-o@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7& 6Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _/ Os^>R  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >. LKct*5K  
class CAboutDlg : public CDialog l`gTU?<xd  
{ G;]:$J  
 public: _N'75  
  CAboutDlg(); )|]Z>>%t  
  // Dialog Data )+Y&4Qu  
  //{{AFX_DATA(CAboutDlg) jJ++h1 K  
  enum { IDD = IDD_ABOUTBOX }; Z$;"8XUM  
  //}}AFX_DATA F~_;o+e;X  
  // ClassWizard generated virtual function overrides &KqVN]1+^  
  //{{AFX_VIRTUAL(CAboutDlg) ^M|K;jt>  
 protected: oJY[{-qW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6^YJ]w  
  //}}AFX_VIRTUAL & _K*kI:  
  // Implementation ]d'^Xs  
 protected: K/Y Agg  
  //{{AFX_MSG(CAboutDlg) nyhMnp#<  
  //}}AFX_MSG z $6JpG  
  DECLARE_MESSAGE_MAP() C6@t  
}; 'IQsve7cI  
xb$yu.c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .>]N+:O  
{ OVswt  
 //{{AFX_DATA_INIT(CAboutDlg) dZ2`{@AYY  
 //}}AFX_DATA_INIT 9 P"iuU  
} 2)\vj5<~$  
Vxh.<b6&'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [Ox(.  
{ Lko`F$5X  
 CDialog::DoDataExchange(pDX); p|VcMxT9-  
 //{{AFX_DATA_MAP(CAboutDlg) )5yj/0oT  
 //}}AFX_DATA_MAP -M61 Mw1  
} LprM;Q_  
=! m JG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P5URvEnz:  
 //{{AFX_MSG_MAP(CAboutDlg)  Q_4Zb  
 // No message handlers {XnPx? V  
 //}}AFX_MSG_MAP 1dv=xe.  
END_MESSAGE_MAP() ')o0O9/;  
xP@/9SM  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r nBOj#N  
: CDialog(CCaptureDlg::IDD, pParent) 6 = gp:I  
{ Hg(5S,O2  
 //{{AFX_DATA_INIT(CCaptureDlg) y\[r(4h  
  m_bControl = FALSE; JO1 ,TtA  
  m_bAlt = FALSE; {ZqQ!!b  
  m_bShift = FALSE; K $-;;pUl  
  m_Path = _T("c:\\"); +hH}h?K  
  m_Number = _T("0 picture captured."); Lq0 4T0  
  nCount=0; F6dr  
  bRegistered=FALSE; Z?1OdoT-  
  bTray=FALSE; "# S>I8d  
 //}}AFX_DATA_INIT e@jfIF0=}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _D-Riu>#J  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m6U8)!)T  
} s~$zWx@v  
E`xU m9F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r_2b tpL^  
{ Y'N'hRD  
 CDialog::DoDataExchange(pDX); {;k_!v{  
 //{{AFX_DATA_MAP(CCaptureDlg) (cs~@  
  DDX_Control(pDX, IDC_KEY, m_Key); K`4GU[ul  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); X8CVY0<o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); GS%b=kc  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); dVGbe07  
  DDX_Text(pDX, IDC_PATH, m_Path); #nEL~&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \A(5;ZnuD  
 //}}AFX_DATA_MAP 3k{ @.V ?]  
} .#!mDlY;  
,- HIFbXx@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9X]f[^  
//{{AFX_MSG_MAP(CCaptureDlg) D/s?i[lb  
 ON_WM_SYSCOMMAND() MsjnRX:c3u  
 ON_WM_PAINT() #&siHHs \  
 ON_WM_QUERYDRAGICON() zilaP)5x6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4}-#mBV]/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wj%wp[KA$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -1 W  
//}}AFX_MSG_MAP \cZfg%PN  
END_MESSAGE_MAP() `C'}e  
afm_Rrg[  
BOOL CCaptureDlg::OnInitDialog() cU+>|'f &  
{ d8:C3R  
 CDialog::OnInitDialog(); t _\MAK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {A3 m+_8  
 ASSERT(IDM_ABOUTBOX < 0xF000); I,j3bC  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hTw}X.<4  
 if (pSysMenu != NULL) NG9vml  
 { d@g2k> >  
  CString strAboutMenu; #F4X}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |s|/]aD}o  
  if (!strAboutMenu.IsEmpty()) e2Jp'93o'  
  { 8^X]z|2  
   pSysMenu->AppendMenu(MF_SEPARATOR); l0`'5>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); dS$ji#+d$  
  } fn1pa@P  
 } G (\Ckf:  
 SetIcon(m_hIcon, TRUE); // Set big icon RgGA$HN/  
 SetIcon(m_hIcon, FALSE); // Set small icon g1qi\axm  
 m_Key.SetCurSel(0); 8]C1K Zs  
 RegisterHotkey(); 7) 0q--B  
 CMenu* pMenu=GetSystemMenu(FALSE); 2U%qCfh6|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b1=pO]3u  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S=O$JP79  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Wz{%"o  
 return TRUE; // return TRUE unless you set the focus to a control !K\itOEP-  
} 8c).8RLf  
mP!N<K  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ) `I=oB  
{ RpN <=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -+P7:4/  
 { .)`-Hkxa  
  CAboutDlg dlgAbout; F< |c4  
  dlgAbout.DoModal(); *?N<S$m  
 } <E}N=J'uJ  
 else )ddsyFGW  
 { P6we(I`"2  
  CDialog::OnSysCommand(nID, lParam); xid:"y=_&  
 } IJIQ" s  
} ~:Ixmqi}R  
q^6N+^}QN  
void CCaptureDlg::OnPaint() Wp4K6x  
{ *w 21U!  
 if (IsIconic()) CB]l[hM$  
 { V6+Zh>'S  
  CPaintDC dc(this); // device context for painting } J(1V!EA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (}0S1)7t  
  // Center icon in client rectangle  tgW kX  
  int cxIcon = GetSystemMetrics(SM_CXICON); M.[wKGX(  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2 `&<bt[g  
  CRect rect; 8[HZ@@  
  GetClientRect(&rect); ue9h   
  int x = (rect.Width() - cxIcon + 1) / 2; ,Hh*3rR^  
  int y = (rect.Height() - cyIcon + 1) / 2; 8t\}c6/3"  
  // Draw the icon raHVkE{<  
  dc.DrawIcon(x, y, m_hIcon); 8KKz5\kn7  
 } LP?P=c  
 else :<UtHf<=k  
 { %^!aB  
  CDialog::OnPaint(); Y?t2,cm   
 } os_WYQ4>j  
} +"Ub/[J{G1  
+!xu{2!  
HCURSOR CCaptureDlg::OnQueryDragIcon() V4\56 0  
{ sDAK\#z  
 return (HCURSOR) m_hIcon; k}<<bm*f  
} 2_N/wR#=&  
w&C1=v -h  
void CCaptureDlg::OnCancel() #%WCL'6B  
{ [DhEh@  
 if(bTray) 1t#XQ?8  
  DeleteIcon(); ]|y}\7Aa  
  CDialog::OnCancel(); k- vA#  
} B{99gwMe]  
6Ty 3e|do  
void CCaptureDlg::OnAbout() QES^^PQe:  
{ %-r?=L  
 CAboutDlg dlg; V" }*"P-%  
 dlg.DoModal(); %r P !  
} WP!il(Gr  
F-tFet  
void CCaptureDlg::OnBrowse() dm  2EH  
{ 9.]kOs_  
 CString str; `fMpV8vv  
 BROWSEINFO bi; ()B7(Y  
 char name[MAX_PATH]; 9R>~~~{-Go  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); r},lu=em  
 bi.hwndOwner=GetSafeHwnd(); !"%S#nrL$  
 bi.pszDisplayName=name; vlAy!:CV  
 bi.lpszTitle="Select folder"; UeNF^6sWu0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; L5&K}F]r^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); TR?Bvy2s:g  
 if(idl==NULL) FR(QFt!g  
  return; w_!%'9m>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2$Wo&Q^_  
 str.ReleaseBuffer(); Onyh1  
 m_Path=str; UI_v3c3b  
 if(str.GetAt(str.GetLength()-1)!='\\') <dS5|||  
  m_Path+="\\"; > '.[G:b  
 UpdateData(FALSE); vuW-}fY;  
} JeL~]F  
18rp; l{  
void CCaptureDlg::SaveBmp() -`g J  
{ LGXZx}4@;  
 CDC dc; 1Df, a#,y"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %2,/jhHL  
 CBitmap bm; :-U53}Iy  
 int Width=GetSystemMetrics(SM_CXSCREEN); tStJ2-5*t  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]6q*)q:`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Qqh^E_O  
 CDC tdc; k1m'Ka-  
 tdc.CreateCompatibleDC(&dc); ^} tuP  
 CBitmap*pOld=tdc.SelectObject(&bm); s*eyTm  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }9 ?y'6l  
 tdc.SelectObject(pOld); ]An_5J  
 BITMAP btm; Z]7tjRvq)  
 bm.GetBitmap(&btm); ] .`_, IO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; k3#wLJ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ZLuPz#  
 BITMAPINFOHEADER bih; +2El  
 bih.biBitCount=btm.bmBitsPixel; yE<,Z%J[n  
 bih.biClrImportant=0; oLd:3,p}  
 bih.biClrUsed=0; 1Lc8fP$  
 bih.biCompression=0; m $)YYpX  
 bih.biHeight=btm.bmHeight; y{?Kao7Ij  
 bih.biPlanes=1; N?zV*ngBS  
 bih.biSize=sizeof(BITMAPINFOHEADER); OFp#<o,p  
 bih.biSizeImage=size; $8=(I2&TW  
 bih.biWidth=btm.bmWidth; \Me"'.F?  
 bih.biXPelsPerMeter=0; eA1'qww"'  
 bih.biYPelsPerMeter=0; q{[1fE"[K4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wzg i @i  
 static int filecount=0; K` 2i  
 CString name; 16L"^EYq  
 name.Format("pict%04d.bmp",filecount++); |MVV +.X  
 name=m_Path+name; ;tm3B2  
 BITMAPFILEHEADER bfh; zWJKYFqK  
 bfh.bfReserved1=bfh.bfReserved2=0; Ls(&HOK[p  
 bfh.bfType=((WORD)('M'<< 8)|'B'); JOPTc]  
 bfh.bfSize=54+size; !#C)99L"F  
 bfh.bfOffBits=54; o16d`}/<  
 CFile bf; T:Bzz)2/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KoFv0~8Q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ? 1GJa]G  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RZ<.\N (M  
  bf.WriteHuge(lpData,size); ": nI_~q  
  bf.Close(); =?^-P{:\?  
  nCount++; ,Io0ZE>`V  
 } NWeV>;lh9  
 GlobalFreePtr(lpData); 5%'o%`?i  
 if(nCount==1) Nz}|%.GP"  
  m_Number.Format("%d picture captured.",nCount); w{~" ;[@  
 else 1R*1BStc  
  m_Number.Format("%d pictures captured.",nCount); tD865gi  
  UpdateData(FALSE); N=.}h\{0  
} >}mNi:6xq  
dWMccn;-m  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3Nc'3NPQ'  
{ [1e.i  
 if(pMsg -> message == WM_KEYDOWN) $x/J+9Ww  
 { 3Sk5I%  
  if(pMsg -> wParam == VK_ESCAPE) EkDws `@  
   return TRUE; g^qz&;R]  
  if(pMsg -> wParam == VK_RETURN) SCqu,  
   return TRUE; Rz)v-Yu  
 } x,}ez  
 return CDialog::PreTranslateMessage(pMsg); w' .'Yu6  
} y(V&z"wk[  
 B$@1QG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .vN)A *  
{ /nwxuy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uwmoM>I W^  
  SaveBmp(); 6Q?BwD+>  
  return FALSE; :vw0r`  
} 1<;\6sg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e og\pMv  
 CMenu pop; CZF^Wxk  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *Rz!i m|  
 CMenu*pMenu=pop.GetSubMenu(0); jQO* oq}  
 pMenu->SetDefaultItem(ID_EXITICON); 0kkRK*fp}x  
 CPoint pt; '9f6ZAnYpQ  
 GetCursorPos(&pt); 7sCR!0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o7m99(  
 if(id==ID_EXITICON) | pF5`dX  
  DeleteIcon(); 7k.d|<mRv  
 else if(id==ID_EXIT) ]6jHIk|  
  OnCancel(); /j`i/Ha1  
 return FALSE; Og_2k ~  
} f34_?F<h  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7YoofI  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~W2:NQ>i  
 AddIcon(); 9yO{JgKA  
 return res; qn5y D!1  
} @?'t@P:4  
~JAH-R  
void CCaptureDlg::AddIcon() c(QG4.)m  
{ ?ykVfO'  
 NOTIFYICONDATA data; 2,rY\Nu_  
 data.cbSize=sizeof(NOTIFYICONDATA); f+Pg1Q0zI  
 CString tip; ZD$-V 3e`  
 tip.LoadString(IDS_ICONTIP); j0ci~6&b3_  
 data.hIcon=GetIcon(0); XYz,NpK  
 data.hWnd=GetSafeHwnd(); w:~nw;.T  
 strcpy(data.szTip,tip); 6 Xzk;p  
 data.uCallbackMessage=IDM_SHELL; d;;>4}XJ]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }qG?Vmq*R[  
 data.uID=98; em f0sL  
 Shell_NotifyIcon(NIM_ADD,&data); ;D%$Eh&oma  
 ShowWindow(SW_HIDE); LsuAOB 8  
 bTray=TRUE; !l sy&6  
}  Oz"@yL}  
e-L5=B  
void CCaptureDlg::DeleteIcon() tI/mE[W  
{ x.jYip  
 NOTIFYICONDATA data;  ]2hF!{wc  
 data.cbSize=sizeof(NOTIFYICONDATA); RTdD]pE8Q  
 data.hWnd=GetSafeHwnd(); 2hjre3"?  
 data.uID=98; M Ak-=?t  
 Shell_NotifyIcon(NIM_DELETE,&data); }CB=c]p  
 ShowWindow(SW_SHOW); MAm1w'ol"  
 SetForegroundWindow(); T%M1[<"Q  
 ShowWindow(SW_SHOWNORMAL); C:|q'"F  
 bTray=FALSE; j1'xp`jgv  
} z*??YUT\M  
X ,V= od>  
void CCaptureDlg::OnChange() GC5#1+fQ  
{ U89]?^|bb  
 RegisterHotkey(); L%c]%3A  
} 8:3oH!n  
YyQf  
BOOL CCaptureDlg::RegisterHotkey() @lb=-oR!~  
{ pgLzFY['  
 UpdateData(); >S?C {_g  
 UCHAR mask=0; PCV58n3  
 UCHAR key=0; 8GF[)z&|P:  
 if(m_bControl) -s?dzX  
  mask|=4; >/ *?4  
 if(m_bAlt) CSd9\V  
  mask|=2; pq/ FLYiv  
 if(m_bShift) Thht_3_C,f  
  mask|=1; v*C+U$_3\1  
  key=Key_Table[m_Key.GetCurSel()]; lx A<iQia  
 if(bRegistered){ DK#65H'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ihpz}g  
  bRegistered=FALSE; Z~-T0Ab-  
 } 1j${,>4tQ  
 cMask=mask; =jk-s*g  
 cKey=key; <3],C)Zwc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =F^->e0N  
 return bRegistered; }iiG$?|.  
} Cu)%s  
z[0LU]b<  
  四、小结 q/d5P  
 1pYmtr  
  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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