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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: n$n)!XL/  
  E^a He  
  一、实现方法 c`94a SnV  
D3s]49j)  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: hce *G@b  
\M-}(>Pfk  
#pragma data_seg("shareddata") ,"~#s(  
HHOOK hHook =NULL; //钩子句柄 OTs vox|(  
UINT nHookCount =0; //挂接的程序数目 1@*qz\ YY  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @Omgk=6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;v0M ::  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey aV?dy4o$  
static int KeyCount =0; WZ @/'[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Nf(Np1?;c  
#pragma data_seg() !iBe/yb  
d?G ~k[C!a  
  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。 #?/&H;n_8S  
Te=[tx~x  
  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: e|)6zh<O:  
>CtT_yhx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR C'mYR3?m;  
cKey,UCHAR cMask) 5}d"nx  
{ ?-mDvW  
 BOOL bAdded=FALSE; Enu/Nj 2  
 for(int index=0;index<MAX_KEY;index++){ 41f4zisZ  
  if(hCallWnd[index]==0){ `NqX{26GV+  
   hCallWnd[index]=hWnd; dHp(U :)  
   HotKey[index]=cKey; a g Za+a  
   HotKeyMask[index]=cMask; xxWrSl`fB  
   bAdded=TRUE; /XtpGk_1)  
   KeyCount++; n]$50_@  
   break; <BoDLvW>  
  } K?[*9Q'\  
 } Q@B--Omfh  
 return bAdded; 9aYDi)  
} ? +{=>{1  
//删除热键 3n{'}SYyz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _&!%yW@  
{ <i9pJGW  
 BOOL bRemoved=FALSE; ~Pq(Ta  
 for(int index=0;index<MAX_KEY;index++){  d~B ]s  
  if(hCallWnd[index]==hWnd){ u~MD?!LV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~ZbEKqni2  
    hCallWnd[index]=NULL; F/c7^  
    HotKey[index]=0; l AF/O5b  
    HotKeyMask[index]=0; !Z +4FwF  
    bRemoved=TRUE; {k.Dy92  
    KeyCount--; L'XX++2  
    break; 1T(:bM_t`7  
   } Wez"E2J`  
  } ?M'_L']N[  
 } x2gnB@t  
 return bRemoved; t Dx!m~[  
} 6")co9  
q:A{@kFq_  
a%f?OsY  
  DLL中的钩子函数如下: 72oiO[>N'  
OnGtIY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Hd)z[6u8eT  
{ c5~d^  
 BOOL bProcessed=FALSE; NPjh2 AJm  
 if(HC_ACTION==nCode) #$trC)?~q  
 { _2*Ryz  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 moO=TGG;F  
   switch(wParam) @Y2"=QVt  
   {  JN;92|x  
    case VK_MENU: V. sIiE  
     MaskBits&=~ALTBIT; ^<L;"jl%  
     break; 1 o5DQ'~n  
    case VK_CONTROL: 6n9;t\'Gt  
     MaskBits&=~CTRLBIT; -P!_<\q\l  
     break; TUeW-'/1  
    case VK_SHIFT: 7bBOV(/s  
     MaskBits&=~SHIFTBIT; 56!>}!8!  
     break; -]=-IiC#  
    default: //judge the key and send message rN3i5.*/t  
     break; sDV*k4  
   } utk'joo  
   for(int index=0;index<MAX_KEY;index++){ F$a?} }  
    if(hCallWnd[index]==NULL) V,>_L  
     continue; qta^i819  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /+pPcK  
    { C4V#qhj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jz(!eTVs  
     bProcessed=TRUE; =\v./Q-  
    } [H#*#v  
   } T*"15ppfk  
  } ZSL:q%:.  
  else if((lParam&0xc000ffff)==1){ //有键按下 " bHeNWZ  
   switch(wParam) Wj N0KA  
   { rx^vh%/ Q!  
    case VK_MENU: v@OyB7}  
     MaskBits|=ALTBIT; lNV%R(  
     break; MZ_+doN  
    case VK_CONTROL: j!c[$;  
     MaskBits|=CTRLBIT; {4\hxyw  
     break; N_jCx*.G  
    case VK_SHIFT: r Ntc{{3_  
     MaskBits|=SHIFTBIT; &&C]i~  
     break; d\nBc6  
    default: //judge the key and send message D}Jhg`9  
     break; IbRy~  
   } %\=oy=f  
   for(int index=0;index<MAX_KEY;index++){ .HTX7mA3  
    if(hCallWnd[index]==NULL) 9T*%CI  
     continue; mPHn &4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %y zFWDg  
    { C#]%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;0}8vs  
     bProcessed=TRUE;  *,9.Bx*  
    } 2i);2>HLG  
   } g*9jPwdG  
  } $"Oy }  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;]<{ <czc  
   for(int index=0;index<MAX_KEY;index++){ B!jINOg  
    if(hCallWnd[index]==NULL) [ e4)"A"  
     continue; !x9j~D'C`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H!dUQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nU"V@_?\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *qcL(] Yq  
   } 4_,l[BhsQG  
  } /Cd`h ;#@  
 } ],r?]>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "i$uV3d  
} }vOUf# ^k  
_q([k_4h  
  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: ) Qve[O  
<@C Bc:j0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9E{Bn#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eK"B.q7  
5G8`zy  
  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: Z-m,~Hh  
]y 6`9p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fTi,S)F'  
{ Xq&x<td  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zE V J  
 { 8uME6]m i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @URLFMFi  
  SaveBmp(); nbYkr*: "t  
  return FALSE; H3 _7a9  
 } FAu G`zu  
 …… //其它处理及默认处理 an3HKfv  
} T6f{'.w  
6Rn_@_Nn)f  
$;*YdZ`q  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 vx=I3o  
n5_r 3{  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 '3uj6Wq2  
~B%EvG7:n  
  二、编程步骤 N}\Da: _  
!l'Az3'J|  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; F2y M2Ldx  
>Uvtsj#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,eRl Z3T  
Yt*M|0bL  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; RIX0AE  
iUh_rX9A"  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Ms ?V1  
S=lA^#'UdX  
  5、 添加代码,编译运行程序。 . iq.H  
[Dq7mqr$  
三、程序代码 U'LO;s04m  
R~b9)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B$7m@|p!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) bxP>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @1P1n8mH]  
#if _MSC_VER > 1000 s<qSelj  
#pragma once : o$ R@l  
#endif // _MSC_VER > 1000 G*BM'^0+  
#ifndef __AFXWIN_H__ e#k9}n^+  
#error include 'stdafx.h' before including this file for PCH <9bQAyL9  
#endif c>K/f7  
#include "resource.h" // main symbols Xj$J}A@  
class CHookApp : public CWinApp |aN0|O2  
{ fD q, )~D  
 public: kETA3(h'  
  CHookApp(); )iy>sa{  
  // Overrides <Q=ES,M  
  // ClassWizard generated virtual function overrides ^e8R 43w:!  
  //{{AFX_VIRTUAL(CHookApp) 5h[u2&;G  
 public: p)ta c*US  
  virtual BOOL InitInstance(); QN-n9f8  
  virtual int ExitInstance(); CzzG  
  //}}AFX_VIRTUAL +nd'Uf   
  //{{AFX_MSG(CHookApp) lf|e8kU\f  
  // NOTE - the ClassWizard will add and remove member functions here. U6X~]|o  
  // DO NOT EDIT what you see in these blocks of generated code ! 'KQ]7  
  //}}AFX_MSG W<2%J)N<  
  DECLARE_MESSAGE_MAP() K_`*ZV{r  
}; )F? 57eh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P0Na<)\'Y!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !N,Z3p>Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5 LX3.  
BOOL InitHotkey(); z$G?J+?J  
BOOL UnInit(); ~<, \=;b/  
#endif (uOW5,e7  
O)Nt"k7 b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. fokT)nf~^8  
#include "stdafx.h" |k&.1NkZ  
#include "hook.h" -7ct+3"J  
#include <windowsx.h> /_,~dt  
#ifdef _DEBUG j %TYyL-  
#define new DEBUG_NEW ^yK94U;<Gy  
#undef THIS_FILE .EloBP  
static char THIS_FILE[] = __FILE__; 5?;'26iC  
#endif +nuv?QB/  
#define MAX_KEY 100 6WfyP@ f  
#define CTRLBIT 0x04 dGIu0\J\$  
#define ALTBIT 0x02 46_<v=YSJ  
#define SHIFTBIT 0x01 c7s4 g-  
#pragma data_seg("shareddata") LEhku4U.  
HHOOK hHook =NULL; PR|Trnd&D  
UINT nHookCount =0; Z55,S=i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 77i |a]Kd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT no?)GQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p w>A Q  
static int KeyCount =0; zp4ru\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?%Y?z ]L#  
#pragma data_seg() 3!Qt_,  
HINSTANCE hins; ts;_T..L  
void VerifyWindow(); ";s5It  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )SA$hwR  
//{{AFX_MSG_MAP(CHookApp) c;U\nC<Y  
// NOTE - the ClassWizard will add and remove mapping macros here. *~!xeL  
// DO NOT EDIT what you see in these blocks of generated code! +ZRsa`'^  
//}}AFX_MSG_MAP MP}H 5  
END_MESSAGE_MAP() pDkT_6Q  
%\~;I73  
CHookApp::CHookApp() )lw7 W9  
{ m9G,%]4|  
 // TODO: add construction code here, o95O!5 hl  
 // Place all significant initialization in InitInstance e!4akKw4wD  
} a+{g~/z;,Q  
,xD{A}}V  
CHookApp theApp; jLQjv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e_1mO 5z  
{ 1 9 k$)m  
 BOOL bProcessed=FALSE; n[4Nu`E9  
 if(HC_ACTION==nCode) CPVKz   
 { c6c^9*,V  
  if((lParam&0xc0000000)==0xc0000000){// Key up ''5%5(Y.r  
   switch(wParam) ~Y'e1w$`  
   { m6;Xo}^w  
    case VK_MENU: ~|uCZ.;o  
     MaskBits&=~ALTBIT; cJA :vHyw  
     break; !'{j"tv  
    case VK_CONTROL: rB4#}+Uq  
     MaskBits&=~CTRLBIT; .qK=lHxT  
     break; ?>%u[g   
    case VK_SHIFT: k5/nAaiVE  
     MaskBits&=~SHIFTBIT; %+I(S`}  
     break; k2t?e:)3zr  
    default: //judge the key and send message w:Lu  
     break; _23sIUN c3  
   } "~V}MPt  
   for(int index=0;index<MAX_KEY;index++){ B4|`Z'U#;  
    if(hCallWnd[index]==NULL) HO@T2t[  
     continue; V)@MM2,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ESomw  
    { Q}=RG//0*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [CUJA  
     bProcessed=TRUE; ?1N0+OW   
    } zr[~wM  
   } 19N:9;Ixz  
  } xJ"Zg]d{  
  else if((lParam&0xc000ffff)==1){ //Key down /ruf1?\,R  
   switch(wParam) 6~!YEuA  
   { 4X\*kF%  
    case VK_MENU:  ]Ea7b  
     MaskBits|=ALTBIT; JxLH]1b  
     break; XS!ZTb>[  
    case VK_CONTROL: 6pLwwZD  
     MaskBits|=CTRLBIT; :mJM=FeJ  
     break; $U8ap4EXM  
    case VK_SHIFT: j2P|cBXu  
     MaskBits|=SHIFTBIT; +%<Jr<~W  
     break; ;9I#>u  
    default: //judge the key and send message v PGuEfz  
     break; K[kmfXKu  
   } OeAPBhTmFj  
   for(int index=0;index<MAX_KEY;index++) z9+94<J  
   { D/:)rj14b  
    if(hCallWnd[index]==NULL) }cPV_^{  
     continue; {``}TsN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z~c7r n  
    { ^=W&p%Y(!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0ay!tS dN  
     bProcessed=TRUE; =#V11j  
    } Z|/):nVP7  
   } F4&N;Zm2  
  } &.z/dFmG  
  if(!bProcessed){ *C:+N>  
   for(int index=0;index<MAX_KEY;index++){ A;|DQR()  
    if(hCallWnd[index]==NULL) uLCU3nI  
     continue; )m'_>-`^:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P\AH9#XL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ..T (9]h  
   } |X.z|wKT6  
  } r{TNPa6!  
 } x$Oz0[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )KuvG:+9W  
} f2u2Ns0Ym  
7_3O]e[8  
BOOL InitHotkey() "J.jmR;  
{ Tk!b`9  
 if(hHook!=NULL){ `o3d@Vc  
  nHookCount++; \k,bz 0  
  return TRUE; M/DTD98'N  
 } :3t])mL#   
 else h0eo:Ahi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); m2! 7M%]GC  
  if(hHook!=NULL) TkBBHg;  
   nHookCount++; y2U:( H:l!  
  return (hHook!=NULL); ?qbp  
} c[y8"M5  
BOOL UnInit() 1v4kN -  
{ bGJUu#  
 if(nHookCount>1){ 5QSmim  
  nHookCount--; @j (jOe  
  return TRUE; :kVV.a#g  
 } nGbrWu]w  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sy?>e*-{  
 if(unhooked==TRUE){ !kcg#+s91  
  nHookCount=0; .'a|St  
  hHook=NULL; FSmi.7  
 } @Y,F&8a$  
 return unhooked; z3C^L  
} ul?BKV+3E  
qL P +@wbJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =c,gK8C  
{ oB\Xl)A<  
 BOOL bAdded=FALSE; nAg(lNOWN  
 for(int index=0;index<MAX_KEY;index++){ m?j!0>  
  if(hCallWnd[index]==0){ 9C$!tz>>+i  
   hCallWnd[index]=hWnd; #{M -3  
   HotKey[index]=cKey; 5a ~tp'  
   HotKeyMask[index]=cMask; *o[%?$8T  
   bAdded=TRUE; duS #&w  
   KeyCount++; r+\z0_' w6  
   break; i njmP9ed  
  } gJ&!w8v.  
 } ,_$"6  
 return bAdded; tTt3D]h(  
} ]#$kA9  
LU{Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]~^/w}(K  
{ 8UIL_nPO  
 BOOL bRemoved=FALSE; =5ih,>>g  
 for(int index=0;index<MAX_KEY;index++){ 9^^#I ~-  
  if(hCallWnd[index]==hWnd){ W~%~^2g ;k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dM UDLr-  
    hCallWnd[index]=NULL; i .N1Cvp&  
    HotKey[index]=0; !_9$[Oq~  
    HotKeyMask[index]=0; h)rf6*hw  
    bRemoved=TRUE; i6d$/ yP"  
    KeyCount--; lX*;KHT)  
    break; swlWe}1  
   } ,}tdfkZFYl  
  } [kOA+\v  
 } F}]_/cY7B  
 return bRemoved; _vdxxhJ=P3  
} $ rYS   
wYA/<0'yH  
void VerifyWindow() HF: T]n,  
{ ;_/q>DR>,3  
 for(int i=0;i<MAX_KEY;i++){ ;q; C ^l  
  if(hCallWnd!=NULL){ Zd U{`>v  
   if(!IsWindow(hCallWnd)){ 5%+}rSn7  
    hCallWnd=NULL; ^|GtO.  
    HotKey=0; \( <{)GpBi  
    HotKeyMask=0; WcwW@cY7\  
    KeyCount--; NNw d;AC  
   }  - 1  
  } L"h@`3o|  
 } h.$__Gs  
} ky[Xf -9#  
.crM!{<Y  
BOOL CHookApp::InitInstance() dB+GTq=6f  
{ qW~ R-g]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); c^Jgr(Ow  
 hins=AfxGetInstanceHandle(); 0@K:Tq-mF  
 InitHotkey(); B21AcE  
 return CWinApp::InitInstance(); {[5L96RH%  
} SP*JleQN  
'ZH<g8:=@  
int CHookApp::ExitInstance() iM|"H..  
{ =)- Q?1q  
 VerifyWindow(); $Oe58  
 UnInit(); %s2"W~  
 return CWinApp::ExitInstance(); ; Uqx&5P}  
} P5}[*k%DQw  
< }wAP_y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file n [Xzo}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 46Q; F  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5o| !f  
#if _MSC_VER > 1000 wUCDJY:,1  
#pragma once :"P hkR  
#endif // _MSC_VER > 1000 %<C G|]W  
F|Dz]ar  
class CCaptureDlg : public CDialog ]jVSsSv  
{ bp>ps@zFq  
 // Construction ; G59}d p~  
 public: ^ wF@6e7/&  
  BOOL bTray; Q^Z<RA(C  
  BOOL bRegistered; ?>.g;3E$  
  BOOL RegisterHotkey(); 9LEilmPs  
  UCHAR cKey; id tQXwa  
  UCHAR cMask; te*Y]-&I|/  
  void DeleteIcon(); <,pLW~2-"  
  void AddIcon(); C6'*/wq  
  UINT nCount; dA)4(0o8fD  
  void SaveBmp(); rrY{Jf9>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H'0*CiHes  
  // Dialog Data Kt 90mA  
  //{{AFX_DATA(CCaptureDlg) l?JO8^Nn  
  enum { IDD = IDD_CAPTURE_DIALOG }; jqGo-C~  
  CComboBox m_Key; :@>br+S  
  BOOL m_bControl; D d# SUQ  
  BOOL m_bAlt; JXY!c\,  
  BOOL m_bShift; `H2F0{\og  
  CString m_Path; CoUd16*"JM  
  CString m_Number; @CaD8%j{  
  //}}AFX_DATA B~!G lT  
  // ClassWizard generated virtual function overrides ]tQDk4&i  
  //{{AFX_VIRTUAL(CCaptureDlg)  6I cM:x  
 public: A-7wkZ.H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *%N7QyO`I  
 protected: o;VkoYV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *2Vp4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &Ev]x2YC  
  //}}AFX_VIRTUAL kh?#={]Z  
  // Implementation o ?va#/fk  
 protected: f_4S>C$  
  HICON m_hIcon; hdf8U  
  // Generated message map functions eY 4`k  
  //{{AFX_MSG(CCaptureDlg) t$y&=v  
  virtual BOOL OnInitDialog(); q3x;_y^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Q}Ze-JIL$  
  afx_msg void OnPaint(); XJJ[F|k~  
  afx_msg HCURSOR OnQueryDragIcon(); V"7<[u]K|  
  virtual void OnCancel(); {FJX  
  afx_msg void OnAbout(); M8?#%x6;N  
  afx_msg void OnBrowse(); urrO1  
  afx_msg void OnChange(); 7/&C;"  
 //}}AFX_MSG -[f "r`  
 DECLARE_MESSAGE_MAP() T`g?)/  
}; Lf; ta  
#endif  &6\r  
b 5F4+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file n~,]KdU]  
#include "stdafx.h" EFRZ% Y  
#include "Capture.h" B;z>Dd,Y_x  
#include "CaptureDlg.h" #0?"J)  
#include <windowsx.h> 8g[ (nxI~  
#pragma comment(lib,"hook.lib") Ho)t=qn  
#ifdef _DEBUG &N/|(<CB  
#define new DEBUG_NEW ~ ^rey  
#undef THIS_FILE dThn?  
static char THIS_FILE[] = __FILE__; d^Zo35X  
#endif >?>ubM`,  
#define IDM_SHELL WM_USER+1 +Q SxYV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uv|eVT3jNs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "$~}'`(]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W( &Go'9e"  
class CAboutDlg : public CDialog ^I(oy.6?=p  
{ agU%z:M{  
 public: N"YK@)*Q  
  CAboutDlg(); n&0mz1rw  
  // Dialog Data T .Pklty  
  //{{AFX_DATA(CAboutDlg) L9{mYA]q  
  enum { IDD = IDD_ABOUTBOX }; ;L G %s  
  //}}AFX_DATA p|h.@do4   
  // ClassWizard generated virtual function overrides GhG%>U#&a  
  //{{AFX_VIRTUAL(CAboutDlg) Sl. KLc@@  
 protected: BaWQ<T8p8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 60hNCVq%  
  //}}AFX_VIRTUAL P\q<d  
  // Implementation R<n8M"B  
 protected: L,C? gd@"  
  //{{AFX_MSG(CAboutDlg) $@[dm)M  
  //}}AFX_MSG J ?ztn  
  DECLARE_MESSAGE_MAP() }t@f |TX  
}; m4P hn~>Gg  
n0+g]|a AF  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) g[#k.CuP  
{ 'DCKD4@C/  
 //{{AFX_DATA_INIT(CAboutDlg) }b_R5U$@@  
 //}}AFX_DATA_INIT lfxuc7Rdla  
} o,?!"*EP  
Y%78>-2 L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y 2z{rd  
{ qpb/g6g  
 CDialog::DoDataExchange(pDX); cm@jt\D  
 //{{AFX_DATA_MAP(CAboutDlg) i{TIm}_\  
 //}}AFX_DATA_MAP bK ?1MiXb  
} "bD+/\ z  
@T<ad7g-2J  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A#v|@sul  
 //{{AFX_MSG_MAP(CAboutDlg) q%OcLZ<,  
 // No message handlers 4 t&gW  
 //}}AFX_MSG_MAP >EBZ$X  
END_MESSAGE_MAP() WW//heJe-  
 EX[B/YH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4=u+ozCG  
: CDialog(CCaptureDlg::IDD, pParent) N@k3$+ls  
{ d>lt  
 //{{AFX_DATA_INIT(CCaptureDlg) #d7N| 9_  
  m_bControl = FALSE; !OPSSP]-  
  m_bAlt = FALSE; ,9=gVW{  
  m_bShift = FALSE; >%9^%p^  
  m_Path = _T("c:\\"); J?._/RL8-  
  m_Number = _T("0 picture captured."); qq OxTG]  
  nCount=0; fA"<MslKLK  
  bRegistered=FALSE; &}vR(y*#c  
  bTray=FALSE; h7bPAW=(  
 //}}AFX_DATA_INIT EfFz7j&X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yuwc$Qp)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7#~4{rjg  
} |w=Ec#)t4  
_,DO~L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4cott^K.  
{ J6*f Uh  
 CDialog::DoDataExchange(pDX); q}#iV$dAj  
 //{{AFX_DATA_MAP(CCaptureDlg) |:./hdcad  
  DDX_Control(pDX, IDC_KEY, m_Key); IZO@V1-m  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); D,c!#(v cK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); yt. f!"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9GO}&7   
  DDX_Text(pDX, IDC_PATH, m_Path); 3Bejp+xX  
  DDX_Text(pDX, IDC_NUMBER, m_Number); j3 6,w[Y:  
 //}}AFX_DATA_MAP <v]z6B@9!  
} $[[?;g  
+C'XS{K,#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gh TcB  
//{{AFX_MSG_MAP(CCaptureDlg) 8jRs =I  
 ON_WM_SYSCOMMAND() /r276Q  
 ON_WM_PAINT() -7k[Vg?  
 ON_WM_QUERYDRAGICON() DeH0k[o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^uia`sOP4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a*D,*C5}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) v9u<F6  
//}}AFX_MSG_MAP \,2gTi,=  
END_MESSAGE_MAP() w"{bp  
& B}Lo  
BOOL CCaptureDlg::OnInitDialog() >L^xlm%7o  
{ | z:Q(d06  
 CDialog::OnInitDialog(); @!e~G'j%VD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O]t\B *%}  
 ASSERT(IDM_ABOUTBOX < 0xF000); %Ys$@dB  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `AR"!X  
 if (pSysMenu != NULL) #>=8w9]  
 { VKy5=2&  
  CString strAboutMenu; Gu5~ DyT`G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); GMz8B-vk  
  if (!strAboutMenu.IsEmpty()) PkTf JQP8  
  { [cDbaq,T  
   pSysMenu->AppendMenu(MF_SEPARATOR); &M[MEO`t8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )Nbc/nB$  
  } _mXs4  
 } %4,xx'`  
 SetIcon(m_hIcon, TRUE); // Set big icon e8oKn&  
 SetIcon(m_hIcon, FALSE); // Set small icon f e|g3>/|  
 m_Key.SetCurSel(0); >:2}V]/ ;  
 RegisterHotkey(); $0#6"urG  
 CMenu* pMenu=GetSystemMenu(FALSE); h}h^L+4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t)} \9^Uo  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |=O1Hn  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IK'F{QPH  
 return TRUE; // return TRUE unless you set the focus to a control b vRB  
} gY!N3 *:  
L=RGL+f1 _  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f3G1r5x  
{ C,"=}z1P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s O=4IBE  
 { HMV)U{  
  CAboutDlg dlgAbout; :N2E}hxk  
  dlgAbout.DoModal(); P[FV2R~  
 } jJia.#.Ze  
 else qz`rL#W]  
 { ZYa\"zp-  
  CDialog::OnSysCommand(nID, lParam); G=|70pxU  
 } :k~dj C  
} :=9<  
tw<P)V\h  
void CCaptureDlg::OnPaint() 0oSQY[ht/  
{ p>q&&;fe  
 if (IsIconic()) n3$gx,KL  
 { GF'f[F6oI  
  CPaintDC dc(this); // device context for painting ? Vp%=E  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )Q]w6he3  
  // Center icon in client rectangle qBYg[K>  
  int cxIcon = GetSystemMetrics(SM_CXICON); Jt]&;0zn2  
  int cyIcon = GetSystemMetrics(SM_CYICON); BxdX WO  
  CRect rect; ?ok)>P  
  GetClientRect(&rect); eLV.qLBUs  
  int x = (rect.Width() - cxIcon + 1) / 2;  <B )   
  int y = (rect.Height() - cyIcon + 1) / 2; :3^dF}>  
  // Draw the icon p x#suy  
  dc.DrawIcon(x, y, m_hIcon); W pN.]x  
 } & fu z2xv  
 else {E51Kv&_  
 { t`YWwI.  
  CDialog::OnPaint(); =u=Kw R  
 } qnJ50 VVW  
} Uyk,.*8"  
BSgTde|3y  
HCURSOR CCaptureDlg::OnQueryDragIcon() XQ?fJWLU  
{ \GL*0NJ  
 return (HCURSOR) m_hIcon; b+{r! D}~  
} \}#@9=  
Z5B/|{  
void CCaptureDlg::OnCancel() MDHb'<o?y  
{ ,q#2:b<E  
 if(bTray) l^W uS|G[  
  DeleteIcon(); MQ`%``  
  CDialog::OnCancel(); HCj> ,^<h  
} mI"D(bx\  
sn"fK=,#g  
void CCaptureDlg::OnAbout() {<K=*r rZ  
{ 9x?'}  
 CAboutDlg dlg; \uM? S  
 dlg.DoModal(); fu R2S70d  
} I]R9HGJNlJ  
6G of. :"f  
void CCaptureDlg::OnBrowse() ".P){Dep$4  
{ g jxS  
 CString str; qTM%G-  
 BROWSEINFO bi; X>zlb$  
 char name[MAX_PATH]; H)>sTST(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >zngJ$  
 bi.hwndOwner=GetSafeHwnd(); c}-(.eu  
 bi.pszDisplayName=name; P!e=b-T  
 bi.lpszTitle="Select folder"; m Ni2b*k  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2*2:-o cl$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); SK R1E];4  
 if(idl==NULL) %e? fH.)  
  return; Td hTQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }mk>!B}=  
 str.ReleaseBuffer(); y=Q!-~5|fF  
 m_Path=str; E\M-k\cSj  
 if(str.GetAt(str.GetLength()-1)!='\\') BBnq_w"a  
  m_Path+="\\"; 7-* =|gl+  
 UpdateData(FALSE); +,5-qm)Gh>  
} % frfSGf.#  
Sh&PNJ-*  
void CCaptureDlg::SaveBmp() g"K>5Cb  
{ 0.Vi9 7`  
 CDC dc; a]B[`^`z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |=K_F3aJ  
 CBitmap bm; "2{%JFE  
 int Width=GetSystemMetrics(SM_CXSCREEN); I ~$1Lu`~  
 int Height=GetSystemMetrics(SM_CYSCREEN); VhEka#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lH2wG2  
 CDC tdc; gzdG6"  
 tdc.CreateCompatibleDC(&dc); obo&1Uv,/  
 CBitmap*pOld=tdc.SelectObject(&bm); 80;n|nNB  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FTf<c0  
 tdc.SelectObject(pOld); P^)q=A8Z#  
 BITMAP btm; 4kl Ao$  
 bm.GetBitmap(&btm); X`JV R"=4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?*u*de[,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S6D^3n  
 BITMAPINFOHEADER bih; gl7|H&&xV  
 bih.biBitCount=btm.bmBitsPixel; Hd &{d+B  
 bih.biClrImportant=0; f p[,C1U  
 bih.biClrUsed=0; qCPmbg  
 bih.biCompression=0; %d;ezY'2  
 bih.biHeight=btm.bmHeight; (sTuG}  
 bih.biPlanes=1; t ls60h  
 bih.biSize=sizeof(BITMAPINFOHEADER); Vf $Dnu@}z  
 bih.biSizeImage=size; {whvTN1#dh  
 bih.biWidth=btm.bmWidth; ,}SCa'PB  
 bih.biXPelsPerMeter=0; eQDX:b  
 bih.biYPelsPerMeter=0; 3EK9,:<Cf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u2iXJmM*  
 static int filecount=0; M;.ZM<Ga  
 CString name; W?Ww2Lo%Y  
 name.Format("pict%04d.bmp",filecount++); >:1P/U  
 name=m_Path+name; RU#F8O  
 BITMAPFILEHEADER bfh; 1/Zh^foG  
 bfh.bfReserved1=bfh.bfReserved2=0; ,wAz^cK|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j !H^-d}q  
 bfh.bfSize=54+size; sa&) #Z:  
 bfh.bfOffBits=54; 3tAU?sV!  
 CFile bf; bt/ =Kq#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T+IF}4e d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /)L 0`:I#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rcN 9.1  
  bf.WriteHuge(lpData,size); (u1m]WYL  
  bf.Close(); `{Tk@A_yd  
  nCount++; p/ GVTf  
 } bPbb\|u0d  
 GlobalFreePtr(lpData); '{b1!nC;  
 if(nCount==1) 3V<&|  
  m_Number.Format("%d picture captured.",nCount); >I"V],d!6  
 else q_[G1&MC  
  m_Number.Format("%d pictures captured.",nCount); I5ZqBB  
  UpdateData(FALSE); {XCf-{a]~  
} 9KuD(EJS  
quxdG>8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) * ?Jz2[B  
{ r@G#[.*A>  
 if(pMsg -> message == WM_KEYDOWN) CH#k(sy  
 { f 2YLk  
  if(pMsg -> wParam == VK_ESCAPE) bBc-^  
   return TRUE; c1XX~8  
  if(pMsg -> wParam == VK_RETURN) f!_ ctp  
   return TRUE; SU.ythU2,c  
 } +0l`5."d  
 return CDialog::PreTranslateMessage(pMsg); )Kd%\PP  
} "sUyHt-&  
3G}AH E4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5Wx~ZQZ  
{ aHzHvl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b;cMl'  
  SaveBmp(); E%N2k|%8d_  
  return FALSE; zZ-\a[F  
} r(A.<`\   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \}0-^(9zd  
 CMenu pop; f58?5(Dc|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2{|$T2?e  
 CMenu*pMenu=pop.GetSubMenu(0); {Qu"%h.Al  
 pMenu->SetDefaultItem(ID_EXITICON); jNDx,7F-  
 CPoint pt; yHo[{,4itA  
 GetCursorPos(&pt); XzIx:J6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); w?Ju5 5  
 if(id==ID_EXITICON) R9+jW'[K  
  DeleteIcon(); V9NTs8LKc  
 else if(id==ID_EXIT) @~td`Z?1 y  
  OnCancel(); *Mc7f?H  
 return FALSE; w8Sv*K  
} \*t~==WB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _ QOZ sEe  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $.%rAa_H  
 AddIcon(); Fg]?zEa  
 return res; sBX-X$*N  
} ^Q<mV*~  
]b?9zeT*'l  
void CCaptureDlg::AddIcon() @C_KV0i  
{ )FN;+"IJ  
 NOTIFYICONDATA data; >/$Fh:R-  
 data.cbSize=sizeof(NOTIFYICONDATA); e.d #wyeX  
 CString tip; bpAv1udX-W  
 tip.LoadString(IDS_ICONTIP); W!Gdf^Yy<  
 data.hIcon=GetIcon(0); (.Y/  
 data.hWnd=GetSafeHwnd(); rh*sbZ68>E  
 strcpy(data.szTip,tip); 1Tp/MV/>  
 data.uCallbackMessage=IDM_SHELL; $g9**b@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k;W@LfP  
 data.uID=98; OHr Y(I6  
 Shell_NotifyIcon(NIM_ADD,&data); ZD/jX_!t  
 ShowWindow(SW_HIDE); I?#85l{>  
 bTray=TRUE; 9p* gU[  
} HvwYm.$zE  
+EXJ\wy  
void CCaptureDlg::DeleteIcon() Y*oDO$6  
{ uP $ Cj  
 NOTIFYICONDATA data; [(kB 5 a  
 data.cbSize=sizeof(NOTIFYICONDATA); yM.IxpT#$  
 data.hWnd=GetSafeHwnd(); ZFm`UXS  
 data.uID=98; K kW;-{c  
 Shell_NotifyIcon(NIM_DELETE,&data); -7H^n#]  
 ShowWindow(SW_SHOW); EI>l-N2  
 SetForegroundWindow(); ?tdd3ai>  
 ShowWindow(SW_SHOWNORMAL); m0w;8uF2UV  
 bTray=FALSE;  D1 Z{W  
} URgk^nt2p  
e!-,PU9+  
void CCaptureDlg::OnChange() 6Q&r0>^{  
{ WS8+7O'1\  
 RegisterHotkey(); r;>+)**@vl  
} X r63?N  
xiF7}]d+  
BOOL CCaptureDlg::RegisterHotkey() k,F"-K+M  
{ `A$!]&[~|  
 UpdateData(); Xl7aGlH  
 UCHAR mask=0; M,5j5<7  
 UCHAR key=0; d$ACDX2  
 if(m_bControl) g1E~+@  
  mask|=4; A5:qKaAq  
 if(m_bAlt) 1F8 W9b^D  
  mask|=2; f"u *D,/sS  
 if(m_bShift) <:>SGSE9  
  mask|=1; &GTI  
  key=Key_Table[m_Key.GetCurSel()]; }TQ{`a@  
 if(bRegistered){ Am0{8 '  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Qhi '') Q  
  bRegistered=FALSE; Y/<lWbj*A  
 } moj ]j`P5a  
 cMask=mask; / O/`<  
 cKey=key; 7M_U2cd|TD  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gbeghLP[?  
 return bRegistered; ^mWybPqx  
} 8b.u'r174  
W W2Ob*  
  四、小结 Jf)bHjC_V  
u=F+(NE"  
  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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