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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: < `;Mf>V  
  93Gj#Mk  
  一、实现方法 ]Z UE !  
j@nK6`d+1  
  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: JO]?u(m01  
LR.]&(kyd  
#pragma data_seg("shareddata") !_+FuF"@  
HHOOK hHook =NULL; //钩子句柄 U7U&^s6`  
UINT nHookCount =0; //挂接的程序数目 1h`F*:nva  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 OSuQ7V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 KgYQxEbIW  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey IX 6 jb"  
static int KeyCount =0; }Uj-R3]}K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 HrLws95'  
#pragma data_seg() _~1O#*|4  
eCJtNPd  
  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。 EpACd8Fb  
$[HCetaqV  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: w$s6NBF7  
xv>8rW(Np5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9`qw,X&AK_  
cKey,UCHAR cMask) kn$SG  
{ Ot=nKdP}D  
 BOOL bAdded=FALSE; 1M)88&  
 for(int index=0;index<MAX_KEY;index++){ )X*_oH=  
  if(hCallWnd[index]==0){ f[NxqNn  
   hCallWnd[index]=hWnd; G?~Yw'R^8  
   HotKey[index]=cKey; WUYU\J&q3  
   HotKeyMask[index]=cMask; rUV'DC?eE  
   bAdded=TRUE; Qg1kF^=  
   KeyCount++; ' "%hX&]5  
   break; +#>nOn(B  
  } 6Yva4Lv  
 } 6C"${}S F`  
 return bAdded; jN= !Q&^i[  
} , DuyPBAms  
//删除热键 W4qT]m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lM#/F\  
{ FN26f*/  
 BOOL bRemoved=FALSE; X/%!p<}:'  
 for(int index=0;index<MAX_KEY;index++){ 9^sz,auB  
  if(hCallWnd[index]==hWnd){ /3Y"F"`M.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g]MgT-C|  
    hCallWnd[index]=NULL; |LZ+_  
    HotKey[index]=0; M?sTz@tqq  
    HotKeyMask[index]=0; .pxUO3g  
    bRemoved=TRUE; FS)C<T]t  
    KeyCount--; m/g[9Y  
    break; mm!JNb9(  
   } ;)f,A)(Z  
  } asvM/ 9  
 } 3# 0Nd"/0  
 return bRemoved; u&`rK7 J  
} OWr\$lm@z$  
d@ZXCiA},  
H2g#'SK@  
  DLL中的钩子函数如下: =yJc pj  
k'"R;^~xg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;l `(1Q/  
{ !*qQ 7  
 BOOL bProcessed=FALSE; c.-dwz  
 if(HC_ACTION==nCode) 6~!7?FK  
 { KCa @0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^Kl<<pUaV  
   switch(wParam) yJ; ;&  
   {  #K-O<:s=y  
    case VK_MENU: DM)Re~*  
     MaskBits&=~ALTBIT; %t.\J:WN;  
     break; =td(}3|D Y  
    case VK_CONTROL: BG-nf1K(  
     MaskBits&=~CTRLBIT; Y)S f;  
     break; QUXr#!rPY|  
    case VK_SHIFT: ?ODBW/{[G  
     MaskBits&=~SHIFTBIT; M@. 2b.  
     break; hR[_1vuIu  
    default: //judge the key and send message `ST;";7!  
     break; SrWmV@"y  
   } HZ{DlH;&  
   for(int index=0;index<MAX_KEY;index++){ 5C-n"8&C&  
    if(hCallWnd[index]==NULL) >Zm|R|{BE  
     continue; &oVZ2.O#(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k^UrFl  
    { ^D {v L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h5E<wyd96.  
     bProcessed=TRUE; caTKi8  
    } ?|<p^:  
   } nl-tJ.MU"  
  } L6=5]?B=  
  else if((lParam&0xc000ffff)==1){ //有键按下 d\ 7OtM  
   switch(wParam) 8f&#WIZ  
   { uF*tlaV6  
    case VK_MENU: %yVP@M  
     MaskBits|=ALTBIT; VRv.H8^{  
     break; YMwL(m1  
    case VK_CONTROL: |' kC9H[>  
     MaskBits|=CTRLBIT; :N4?W}r.  
     break; ,{RWs^W2  
    case VK_SHIFT: %LL?'&&  
     MaskBits|=SHIFTBIT; P=4o)e7E!  
     break; t .XuH#  
    default: //judge the key and send message 1[Jv9S*f/  
     break; _>{"vY  
   } y<8o!=Tb5  
   for(int index=0;index<MAX_KEY;index++){ @A%\;o o  
    if(hCallWnd[index]==NULL) #@uF?8u  
     continue; 2+\@0j[q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?+{qmqN  
    { Pz'Z n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F n*+uk  
     bProcessed=TRUE; g3'yqIjQL  
    } >ufN[ab  
   } 4Z{ r  
  } c#[d7t8ONe  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a&n}pnEn)  
   for(int index=0;index<MAX_KEY;index++){ !xC IvKW  
    if(hCallWnd[index]==NULL) c=:A/z{  
     continue; PtKrks|y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4':U rJ+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); EhIa31>X  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ymcc|u6$"  
   } .Dyxul  
  } _7-P8"m  
 } H#I%6k*\a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }~NWOJ3;  
}  {0} Q5  
J#k.!]r,Y  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: .t%` "C  
^ G>/;mZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =/^{Pn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FPuF1@K  
j2!^iGS}  
  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: V34]5  
EDGAaN*Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p~t5PU*(  
{ sC RmLUD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cD4H@!=a  
 { McQWZ<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ulY<4MN  
  SaveBmp(); JsQmn<Yt  
  return FALSE; v0~*?m4  
 } @{^6_n+gT%  
 …… //其它处理及默认处理 rt!Uix&  
} vqBT^Q_q;  
bQ_N^[oxQ  
kF"G {5  
  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。 k/#321Z  
\kksZ4,  
  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。 9y&&6r<I  
#-FfyxQ8ai  
  二、编程步骤 Eh?,-!SUQn  
C'//(gjQ-G  
  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"; c9xc@G!  
,W&::/2<7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; RVe UQ%  
5Og=`T  
  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; A^hFRAg4  
hQDZ%>  
  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; j[YO1q*  
P<gr=&  
  5、 添加代码,编译运行程序。 %N-f9o8  
3%SwCYd  
三、程序代码 T,Zfz9{n  
g:>Mooxzi  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL U6R~aRJ;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _,9/g^<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ i_qR&X  
#if _MSC_VER > 1000 R4g% $}  
#pragma once srfM"Lb'  
#endif // _MSC_VER > 1000 dWAKIBe  
#ifndef __AFXWIN_H__ 1Igo9rv  
#error include 'stdafx.h' before including this file for PCH x3?:"D2  
#endif d<^o@  
#include "resource.h" // main symbols qx3`5)ef  
class CHookApp : public CWinApp -_|U"C$  
{ i\u m;\  
 public: /\1MG>#K  
  CHookApp(); V9i[ dF  
  // Overrides $X:r&7t+Q[  
  // ClassWizard generated virtual function overrides /tGj`C&qtw  
  //{{AFX_VIRTUAL(CHookApp) ZQPv@6+oY  
 public: :raYt5n1,y  
  virtual BOOL InitInstance(); /MQI5Djg  
  virtual int ExitInstance(); (#;<iu}  
  //}}AFX_VIRTUAL $j!VJGVG  
  //{{AFX_MSG(CHookApp) _3?7iH  
  // NOTE - the ClassWizard will add and remove member functions here. F`\7&'I  
  // DO NOT EDIT what you see in these blocks of generated code ! ZI'Mr:z4  
  //}}AFX_MSG A#B6]j)  
  DECLARE_MESSAGE_MAP() 34\:1z+s M  
}; u|a+ :r)*4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]@MBE1M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c'r7sI%Yi  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qdeS*r p\  
BOOL InitHotkey(); -P>f2It  
BOOL UnInit(); w- .=u3  
#endif 92HxZ*t7km  
AmmUoS\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g` QbJ61a  
#include "stdafx.h" K1K3s< y+  
#include "hook.h" OCVF+D :  
#include <windowsx.h> E _DSf  
#ifdef _DEBUG SecZ5(+=  
#define new DEBUG_NEW zS##YR  
#undef THIS_FILE +W P  
static char THIS_FILE[] = __FILE__; =9ISsI\Y6  
#endif D.\s mk  
#define MAX_KEY 100 : {Crc   
#define CTRLBIT 0x04 fhZD#D  
#define ALTBIT 0x02 ;0f?-W?1  
#define SHIFTBIT 0x01 3Vj,O?(Z  
#pragma data_seg("shareddata") On{p(| l  
HHOOK hHook =NULL; V=,VOw4  
UINT nHookCount =0; ,3`RM $  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $zvqjT:>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]M;aVw<!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~ST7@-D0  
static int KeyCount =0; 5-ju5z?=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K8UgP?c;0  
#pragma data_seg() elBmF#,j 7  
HINSTANCE hins; .v3~2r*&  
void VerifyWindow(); YQI&8~z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) . !|3a  
//{{AFX_MSG_MAP(CHookApp) ,\BGxGNAmV  
// NOTE - the ClassWizard will add and remove mapping macros here. XfXqq[\N  
// DO NOT EDIT what you see in these blocks of generated code! Iw0Q1bK(  
//}}AFX_MSG_MAP StP7t  
END_MESSAGE_MAP() {)QSxO  
*MEDV1l_T  
CHookApp::CHookApp() 7EKQE>xj  
{ ? }2]G'7?  
 // TODO: add construction code here, ^&W(|R-,J&  
 // Place all significant initialization in InitInstance  {u}Lhv  
} >6(91J  
P7Ws$7x  
CHookApp theApp; |hprk-R*OH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k2xOu9ncEj  
{ 8W|qm;J98  
 BOOL bProcessed=FALSE; ^=nJ,-(h_  
 if(HC_ACTION==nCode) rU /V ~;#%  
 { y:N QLL>  
  if((lParam&0xc0000000)==0xc0000000){// Key up >e7w!v]  
   switch(wParam) , LP |M:  
   { *$ihNX]YG  
    case VK_MENU: %y/8i%@6  
     MaskBits&=~ALTBIT; #*[G,s#t^  
     break; 5mD]uB9  
    case VK_CONTROL: vbeYe2;(  
     MaskBits&=~CTRLBIT; Cku&s  
     break; q>T7};5m2  
    case VK_SHIFT: xsq+RBJi  
     MaskBits&=~SHIFTBIT; F~cvob{  
     break; gt9{u"o  
    default: //judge the key and send message luyU!  
     break; Olg@ Ri  
   } {/x["2a1  
   for(int index=0;index<MAX_KEY;index++){ 52$7vYMto  
    if(hCallWnd[index]==NULL) "]dNN{Wka  
     continue; eJB !|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tnbtfG;z#  
    { ~ l'dpg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lkWID  
     bProcessed=TRUE; $~|#Rz%v  
    } :dtX^IT  
   } .CClc(bO_/  
  } s.E}xv  
  else if((lParam&0xc000ffff)==1){ //Key down |uT&`0T'e`  
   switch(wParam) Kzw )Q  
   { wsyG~^>  
    case VK_MENU:  6[<*C?  
     MaskBits|=ALTBIT; n_Ht{2I  
     break; /N`l z>^~  
    case VK_CONTROL: 5y. n  
     MaskBits|=CTRLBIT; Ri@`sc{n  
     break; G &'eP  
    case VK_SHIFT: Xi]WDH \  
     MaskBits|=SHIFTBIT; i>n.r_!E  
     break; s^X(G!V{c  
    default: //judge the key and send message btC 0w^5  
     break; @?A39G{  
   } f3>8ZB4  
   for(int index=0;index<MAX_KEY;index++) f#RI&I\  
   { Mt@P}4   
    if(hCallWnd[index]==NULL) Nj2f?',;U  
     continue; o5(p&:1M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8:%=@p>$  
    { (GVH#}uB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =|lKB;  
     bProcessed=TRUE; KKR@u(+"a  
    } km; M!}D  
   } x<'(b7{U0  
  } k\T,CZ<  
  if(!bProcessed){ &R54?u^A  
   for(int index=0;index<MAX_KEY;index++){ s6(iiB%d  
    if(hCallWnd[index]==NULL) }nDKSC/[V!  
     continue; JfmNI~%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -uDB#?q:W  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KLI(Rve24  
   } '2u(fLq3h  
  } !$"DD[~\  
 } `.f {V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h*_h M1*;  
} "5]Fl8c?  
W|K"0ab  
BOOL InitHotkey() :/N/u5.]  
{ 1nv#Ehorg  
 if(hHook!=NULL){ S4j`=<T,  
  nHookCount++; yv:8=.r}M  
  return TRUE; JJHr<|K  
 } WxE4r  
 else Ex'6 WN~kD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %[:\ZwT,-  
  if(hHook!=NULL) r7z8ICX'q  
   nHookCount++; m>C}T  
  return (hHook!=NULL); 8SvPDGu `]  
} _zG9.?'b3  
BOOL UnInit() $MF U9<O  
{ )$#]h]ac  
 if(nHookCount>1){ cTO\Vhg  
  nHookCount--;  rO]7 g  
  return TRUE; ;-=Q6Ms8  
 } ?)$+W+vK  
 BOOL unhooked = UnhookWindowsHookEx(hHook); lsV9-)yyl  
 if(unhooked==TRUE){ lW^bn(_gQ  
  nHookCount=0; {*VCR  
  hHook=NULL; )J?Nfi%  
 } re9*q   
 return unhooked; Q:I2\E  
} j';V(ZY&BB  
6#S}EaWf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ecK{+Z'G  
{ bI)ItC_wf!  
 BOOL bAdded=FALSE; LRO'o{4$E  
 for(int index=0;index<MAX_KEY;index++){ Y6T1_XG  
  if(hCallWnd[index]==0){ 60KhwD1  
   hCallWnd[index]=hWnd; Tu Q@b  
   HotKey[index]=cKey; N=J$+  
   HotKeyMask[index]=cMask; xjHOrr OQ  
   bAdded=TRUE; ~7$E\w6  
   KeyCount++; 5!2^|y4r  
   break; *Mf;  
  } oVPtA@  
 } <eU28M?\  
 return bAdded;  8+no>%L  
} GE`:bC3  
,f`435R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k r0PL)$  
{ VvuwgJX  
 BOOL bRemoved=FALSE; +.N3kH  
 for(int index=0;index<MAX_KEY;index++){ 0MK|spc  
  if(hCallWnd[index]==hWnd){ G1 ?."  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +8e~jf3E1  
    hCallWnd[index]=NULL; h+e Oe}  
    HotKey[index]=0; si.A"\bm  
    HotKeyMask[index]=0; i)nb^  
    bRemoved=TRUE; 3,~M`~B  
    KeyCount--; Si,[7um  
    break; N zY}-:{  
   } I^iJ^Z]vx  
  } S Rs~p  
 } X {,OP/  
 return bRemoved; PI>PEge!&  
} ?CB*MWjd  
Kq}/`P  
void VerifyWindow() %G6ml,  
{ %Z@+K_X9x  
 for(int i=0;i<MAX_KEY;i++){ O>)<w Ms`  
  if(hCallWnd!=NULL){ 2 s,[DC  
   if(!IsWindow(hCallWnd)){ Bl5*sfjG  
    hCallWnd=NULL; J/3qJst  
    HotKey=0; ZMmaM "9  
    HotKeyMask=0; l[=7<F  
    KeyCount--; YQ}xr^VA  
   } FLI\SF<  
  } L,*KgLG  
 } %liu[6_  
} +Hz});ix<  
Mq-QWx"P  
BOOL CHookApp::InitInstance() p F\~T>  
{ )ndcBwQc"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,}15Cse  
 hins=AfxGetInstanceHandle(); M17oAVN7D  
 InitHotkey(); 5y7rY!]Bf  
 return CWinApp::InitInstance(); #3@ Du(_n  
} 2j_YHv$I  
a hi lp$v  
int CHookApp::ExitInstance() 3w9j~s  
{ uU v yZ  
 VerifyWindow(); &fJ92v?%^S  
 UnInit(); Fy|tKMhnc  
 return CWinApp::ExitInstance(); T9r"vw  
} -"qw5Y_oF?  
]>fAV(ix  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %,$Ms?,n`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) m,nZrap  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c|<*w[%C  
#if _MSC_VER > 1000 :fI|>I ~  
#pragma once '< ]:su+  
#endif // _MSC_VER > 1000 7.fpGzUM  
>r%L=22+  
class CCaptureDlg : public CDialog "KQ3EI/g  
{ dR"H,$UH  
 // Construction 5b X*8H D  
 public: !@mV$nTA  
  BOOL bTray; %M{qr!?uj  
  BOOL bRegistered; z-|gw.y  
  BOOL RegisterHotkey(); pKDP1S# <  
  UCHAR cKey; 8Xpf|? .  
  UCHAR cMask; K8NoY6  
  void DeleteIcon(); M<Mr L[*j  
  void AddIcon(); ;cQhs7m(9  
  UINT nCount; v3|-eWet^  
  void SaveBmp(); HRkO.230  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :5!>h8p;  
  // Dialog Data Jlw<% }r  
  //{{AFX_DATA(CCaptureDlg) <V?M~u[7f  
  enum { IDD = IDD_CAPTURE_DIALOG }; DDkH`R  
  CComboBox m_Key; `>CHE'_  
  BOOL m_bControl; n>]`8+a~%X  
  BOOL m_bAlt; C"bG?Mb  
  BOOL m_bShift; *yJCnoF  
  CString m_Path; oTOr,Mn0\6  
  CString m_Number; R;,&s!\<  
  //}}AFX_DATA q{v:T}Q|A  
  // ClassWizard generated virtual function overrides _2Sb?]Xn  
  //{{AFX_VIRTUAL(CCaptureDlg) 3xS+Pu\)  
 public: utIR\e#:B  
  virtual BOOL PreTranslateMessage(MSG* pMsg); pvL)BD  
 protected: )N[9r{3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]v=*WK  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  X._skq  
  //}}AFX_VIRTUAL FqQqjA  
  // Implementation WP)r5;Hv`  
 protected: 06@^knm  
  HICON m_hIcon; &YQ  
  // Generated message map functions 40TS=evG  
  //{{AFX_MSG(CCaptureDlg) KL:x!GsV5e  
  virtual BOOL OnInitDialog(); \7W>3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <a/TDW  
  afx_msg void OnPaint(); yOKpi&! r  
  afx_msg HCURSOR OnQueryDragIcon(); shjc`Tqm  
  virtual void OnCancel(); 5\RTy}w3x  
  afx_msg void OnAbout(); 6*`KC)a  
  afx_msg void OnBrowse(); 6 &~8TH  
  afx_msg void OnChange(); qEvHrsw},  
 //}}AFX_MSG RlH|G  
 DECLARE_MESSAGE_MAP() *?|LE C  
}; \]Nlka  
#endif VC%{qal;q  
~R7F[R  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >B)&mC$$S  
#include "stdafx.h" oRl~x^[%[-  
#include "Capture.h" [JAHPy=+w  
#include "CaptureDlg.h" >TSPEvWc  
#include <windowsx.h> eF]`?AeWQ  
#pragma comment(lib,"hook.lib") yuyI)ebC  
#ifdef _DEBUG GE;S5 X]X  
#define new DEBUG_NEW H#pl&/+  
#undef THIS_FILE g)7~vm2/,  
static char THIS_FILE[] = __FILE__; 3vx5dUgl,  
#endif )?35!s6  
#define IDM_SHELL WM_USER+1 AF ,*bb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rf*we+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RTN?[`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p=F!)TnJN  
class CAboutDlg : public CDialog yo\R[i(  
{ 7!%/vO0m  
 public: 3m RP.<=  
  CAboutDlg(); Dep.Qfv{-  
  // Dialog Data tHF -OarUO  
  //{{AFX_DATA(CAboutDlg) yW::`  
  enum { IDD = IDD_ABOUTBOX }; hY$gzls4  
  //}}AFX_DATA L?~>eT  
  // ClassWizard generated virtual function overrides 8K: RoR  
  //{{AFX_VIRTUAL(CAboutDlg) 8 MIn~  
 protected: >< <(6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >*DR>U  
  //}}AFX_VIRTUAL &PY~m<F  
  // Implementation 0$RZ~  
 protected: 4n55{ ?Z  
  //{{AFX_MSG(CAboutDlg) j\W"P_dpd  
  //}}AFX_MSG e/+_tC$@p@  
  DECLARE_MESSAGE_MAP() 3khsGD@  
}; l&rS\TCkp  
ITcgp K6k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t8vR9]n  
{ L=`QF'Im  
 //{{AFX_DATA_INIT(CAboutDlg) *nb `DR  
 //}}AFX_DATA_INIT <2b&AF{En  
} r6 k/QZT  
O &DkB*-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iBCZx>![;  
{ 6T-h("t  
 CDialog::DoDataExchange(pDX); ]=X6* E*/E  
 //{{AFX_DATA_MAP(CAboutDlg) s98Jh(~  
 //}}AFX_DATA_MAP ;#'YO1`gf3  
} L`sg60z  
#cHH<09 rl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9o)sSaTx=  
 //{{AFX_MSG_MAP(CAboutDlg) UoD S)(i  
 // No message handlers A0mj!P9  
 //}}AFX_MSG_MAP 6"3-8orj   
END_MESSAGE_MAP() G$#Q:]N  
'G] P09`*)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NC]]`O2r@  
: CDialog(CCaptureDlg::IDD, pParent) 'gBns  
{ %S$P<nKN5  
 //{{AFX_DATA_INIT(CCaptureDlg) isU7nlc!  
  m_bControl = FALSE;  :P,g,  
  m_bAlt = FALSE; L7kNQ/  
  m_bShift = FALSE; qp#Is{=m  
  m_Path = _T("c:\\"); h%4aL38  
  m_Number = _T("0 picture captured."); \!O3]k,r  
  nCount=0; G6W_)YL  
  bRegistered=FALSE; }s+ t*z  
  bTray=FALSE; ibzcO,c  
 //}}AFX_DATA_INIT ;v#BguM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 dO?zLc0f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &xhwx>C`K  
} p\;\hHai  
jl-2)<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Whoqs_Mm{  
{ -DVoO2|Dv  
 CDialog::DoDataExchange(pDX); u{| Q[hf[  
 //{{AFX_DATA_MAP(CCaptureDlg) EC9bCd-z  
  DDX_Control(pDX, IDC_KEY, m_Key); #@pgB:~lB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &Hz{   
  DDX_Check(pDX, IDC_ALT, m_bAlt); dh9Qo4-{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); VtP^fM^{  
  DDX_Text(pDX, IDC_PATH, m_Path); _v/w ,z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fL xGaOT  
 //}}AFX_DATA_MAP W4OL{p-\/  
} Uu_g_b:z  
9Wu c1#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C8{bqmlm@  
//{{AFX_MSG_MAP(CCaptureDlg) + 6noQYe  
 ON_WM_SYSCOMMAND() t`M4@1S"'  
 ON_WM_PAINT() Cs:?9G  
 ON_WM_QUERYDRAGICON() 8 x=J&d  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1iA0+Ex(j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XA b%V'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]et ]Vkg  
//}}AFX_MSG_MAP :k; c|MW  
END_MESSAGE_MAP() D_SXxP[! g  
^"dVz.  
BOOL CCaptureDlg::OnInitDialog() I45 kPfu  
{ -JKl\E  
 CDialog::OnInitDialog(); }l>\D~:M  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lpq) vKM}^  
 ASSERT(IDM_ABOUTBOX < 0xF000); `Wl_yC_*G;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m&PfZ%'[  
 if (pSysMenu != NULL) MZ2/ks  
 { ]QU 9|1  
  CString strAboutMenu; saRYd{%+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); f 7R/i  
  if (!strAboutMenu.IsEmpty()) r|MBkpcvp  
  { 1'NJ[ C`  
   pSysMenu->AppendMenu(MF_SEPARATOR); -R]Iu\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vU,V[1^a  
  } &6feR#~A  
 } bUzo>fm_  
 SetIcon(m_hIcon, TRUE); // Set big icon TS_5R>R3  
 SetIcon(m_hIcon, FALSE); // Set small icon f:9b q}vH  
 m_Key.SetCurSel(0); `w6*(t:T  
 RegisterHotkey(); ]Cc3}+(s  
 CMenu* pMenu=GetSystemMenu(FALSE); lGlh/B%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "L0Q"t:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (U{,D1?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); XnwVK  
 return TRUE; // return TRUE unless you set the focus to a control E"O6N.}.  
} AZ9;6Df  
CL|d>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "[QQ(]={  
{ u Gmv`R_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c$.Zg=  
 { 7z2Q!0Sz  
  CAboutDlg dlgAbout; 5gq  
  dlgAbout.DoModal(); k/Z]zZC  
 } NR>&1aRbyb  
 else SeV`RUO  
 { 8aqH;|fG}  
  CDialog::OnSysCommand(nID, lParam); K/YXLR +  
 } +C}s"qrb@  
} 9xN`  
`@<~VWe5  
void CCaptureDlg::OnPaint() dc dVB>D  
{ &wX568o  
 if (IsIconic()) Ia[4P8Z  
 { D03QisH=  
  CPaintDC dc(this); // device context for painting <.Dg3RH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @+6cKP  
  // Center icon in client rectangle mz2v2ma  
  int cxIcon = GetSystemMetrics(SM_CXICON); <Fi*wV  
  int cyIcon = GetSystemMetrics(SM_CYICON); tCR#TW+IY-  
  CRect rect; MpVZL29)  
  GetClientRect(&rect); b$eN]L   
  int x = (rect.Width() - cxIcon + 1) / 2; 43}uW, P  
  int y = (rect.Height() - cyIcon + 1) / 2; [Ot<8)Jm  
  // Draw the icon &s(mbpV  
  dc.DrawIcon(x, y, m_hIcon); c(kYCVc   
 } 8 7z]qE  
 else j0b>n#e7  
 { kt# t-N;}x  
  CDialog::OnPaint(); 8U%y[2sT  
 } +h)1NX;o1  
} U]]ON6Y&F  
ae#Qeow`  
HCURSOR CCaptureDlg::OnQueryDragIcon() X:/7#fcG8  
{ F-X L  
 return (HCURSOR) m_hIcon; jK]An;l{Z  
} p[K!.vOt+  
JLbmh1'  
void CCaptureDlg::OnCancel() YfstE3BV  
{ -l~+cI\2  
 if(bTray) P8X59^cJ  
  DeleteIcon(); ei82pLM z  
  CDialog::OnCancel(); ]&?8l:3-G  
} arc{:u.K  
m@y<wk(  
void CCaptureDlg::OnAbout() ;lQ>>[*  
{ !{?<(6;t  
 CAboutDlg dlg; (]nX:t  
 dlg.DoModal(); sE])EwZ  
} 1d!TU=*  
6VtN4c .Q  
void CCaptureDlg::OnBrowse() Ck:+F+7_v  
{ eUKl(  
 CString str; pupt__NZ)n  
 BROWSEINFO bi; pE {yVs  
 char name[MAX_PATH]; k#n%at.g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); p Le[<N  
 bi.hwndOwner=GetSafeHwnd(); 9DmFa5E  
 bi.pszDisplayName=name; Yw6uh4  
 bi.lpszTitle="Select folder"; [NK&s:wMk  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0}"'A[xE  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Db*&'32W  
 if(idl==NULL) I uC7Hx`z  
  return; cR=o!2O  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tZY6{,K%4  
 str.ReleaseBuffer(); A[`2Mnj  
 m_Path=str; !-m 'diE  
 if(str.GetAt(str.GetLength()-1)!='\\') & h\!#X0  
  m_Path+="\\"; IQWoK"B  
 UpdateData(FALSE); AqT}^fS  
} T7^?j :kJ/  
k+zskfo  
void CCaptureDlg::SaveBmp() %us#p|Ya  
{ 8<{i=V*x4  
 CDC dc; 5 FE&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f#\Nz>tOhE  
 CBitmap bm; A*{CT>  
 int Width=GetSystemMetrics(SM_CXSCREEN); !ou;yE&<,  
 int Height=GetSystemMetrics(SM_CYSCREEN); tC5>K9Ed  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (W.G&VSn)  
 CDC tdc; 4N5\sdi  
 tdc.CreateCompatibleDC(&dc); /@1pm/>ZaN  
 CBitmap*pOld=tdc.SelectObject(&bm); nE56A#,Q,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); AYAbq}'Yt  
 tdc.SelectObject(pOld); " H]R\xp  
 BITMAP btm; mRy0zN>?  
 bm.GetBitmap(&btm); ,hWuAu6.L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {mB!mbr  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }S;A%gYm  
 BITMAPINFOHEADER bih; w3&L 6|,  
 bih.biBitCount=btm.bmBitsPixel; :m<#\!?  
 bih.biClrImportant=0; |_hIl(6F5N  
 bih.biClrUsed=0; tF6-@T\6  
 bih.biCompression=0; o%OwKp s  
 bih.biHeight=btm.bmHeight; xkQT#K=i  
 bih.biPlanes=1; "-Pz2QJY  
 bih.biSize=sizeof(BITMAPINFOHEADER); P5W58WxT'  
 bih.biSizeImage=size; -56gg^Pnr  
 bih.biWidth=btm.bmWidth; Fw8b^ew  
 bih.biXPelsPerMeter=0; ;u=%Vn"2a  
 bih.biYPelsPerMeter=0; BDCyeC,Q3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !gcea?I  
 static int filecount=0; @SI,V8i  
 CString name; !R![:T\,  
 name.Format("pict%04d.bmp",filecount++); WtC&Qyuq  
 name=m_Path+name; ]_`ICS  
 BITMAPFILEHEADER bfh; YRCOh:W*  
 bfh.bfReserved1=bfh.bfReserved2=0; RN$>!b/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6m@B.+1  
 bfh.bfSize=54+size; Ed+jSO0  
 bfh.bfOffBits=54; lx7]rkWo|a  
 CFile bf; g""Ep  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B}J0 d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); V{ fG~19  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yG;@S8zC  
  bf.WriteHuge(lpData,size); I]%Kd('  
  bf.Close(); 0es\ j6c  
  nCount++; j9X|c7|  
 } _j*a5fsPU  
 GlobalFreePtr(lpData); tns4e\  
 if(nCount==1) f@k.4aS  
  m_Number.Format("%d picture captured.",nCount); q0b*#j  
 else DPkH:X  
  m_Number.Format("%d pictures captured.",nCount); ,b:~Vpb1I  
  UpdateData(FALSE); ">5$;{;2r  
} i1K$~  
f`iDF+h<6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !JBj%|!  
{ q8HnPXV  
 if(pMsg -> message == WM_KEYDOWN) d5`D[,]d  
 { X|aD>CT  
  if(pMsg -> wParam == VK_ESCAPE) ght3#  
   return TRUE; y8Rq2jI;(e  
  if(pMsg -> wParam == VK_RETURN) csA-<}S5]b  
   return TRUE; @1i<=r  
 } Ro;I%j  
 return CDialog::PreTranslateMessage(pMsg); mW~*GD~r  
} s~ou$!|  
6  $`l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ErgWsAw-  
{ sLWVgD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HA[7)T N1E  
  SaveBmp(); < FY%QB)h  
  return FALSE; [,{Nu EI  
} 4K 8(H9(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *U$%mZS]1  
 CMenu pop; fe8hgTP|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FNw]DJ]  
 CMenu*pMenu=pop.GetSubMenu(0); z|t2;j[  
 pMenu->SetDefaultItem(ID_EXITICON); 8m?cvI  
 CPoint pt; X3~` ~J  
 GetCursorPos(&pt); B4 5#-V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ug384RzHN  
 if(id==ID_EXITICON) ?<S fhjU  
  DeleteIcon(); QMy1!:Z&!  
 else if(id==ID_EXIT) [7NO !^  
  OnCancel(); QKhGEW~G  
 return FALSE; 6Kw?  
} +N'&6z0Wf  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z:^ S-h  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xu{VU^'Y  
 AddIcon(); a!f71k r  
 return res; 2.\"Q  
} Y/?z8g'p  
LXZI|K[}k  
void CCaptureDlg::AddIcon() 3`)ej`  
{ G&t|aY-   
 NOTIFYICONDATA data; 7#SfuZ0@  
 data.cbSize=sizeof(NOTIFYICONDATA); x&"P^gh)  
 CString tip; p/G9P +?  
 tip.LoadString(IDS_ICONTIP); }0f~hL24  
 data.hIcon=GetIcon(0); G:@1.H`  
 data.hWnd=GetSafeHwnd(); m#-&<=  
 strcpy(data.szTip,tip); ddbQFAQQQ  
 data.uCallbackMessage=IDM_SHELL; .&`apQD}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; QjD=JC+  
 data.uID=98; 1f'msy/  
 Shell_NotifyIcon(NIM_ADD,&data); oKH+Q6S:  
 ShowWindow(SW_HIDE); &C)97E  
 bTray=TRUE; gGN 6Yqj0  
} LDYa{w-t  
H/Rzs$pnv  
void CCaptureDlg::DeleteIcon()  z:   
{ OmK4 \_.  
 NOTIFYICONDATA data; _'<FBlIN  
 data.cbSize=sizeof(NOTIFYICONDATA); e{3%-  
 data.hWnd=GetSafeHwnd(); vF&0I2T~l  
 data.uID=98; B79~-,Yh  
 Shell_NotifyIcon(NIM_DELETE,&data); KXpbee  
 ShowWindow(SW_SHOW); o,S(;6pDJ  
 SetForegroundWindow(); $My~sN8  
 ShowWindow(SW_SHOWNORMAL); t*dq*(3"c  
 bTray=FALSE; a7=lZZ?  
} !6z{~Z:   
B@#vS=g  
void CCaptureDlg::OnChange() r'lANl-v  
{ 0{u%J%;  
 RegisterHotkey(); NjPQT9&3h  
} AX Q.E$1g  
G}LV"0?  
BOOL CCaptureDlg::RegisterHotkey() b|;h$otC  
{ NqveL<r`  
 UpdateData(); {wgq>cb  
 UCHAR mask=0; JT~Dr KI_  
 UCHAR key=0; TB=_r(:l+  
 if(m_bControl) Y\+LBbB8  
  mask|=4; j ,lI\vw<  
 if(m_bAlt) mx}4iO:Xp  
  mask|=2; NciIqF  
 if(m_bShift) }`!-WY  
  mask|=1; ruyQ}b:zS  
  key=Key_Table[m_Key.GetCurSel()]; mNEh\4ai  
 if(bRegistered){ O%6D2d  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); u} +?'B)  
  bRegistered=FALSE; xE$lx:C"FU  
 } K-K>'T9F}  
 cMask=mask; fVVD}GM=  
 cKey=key; P,xJVo\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =BJe}AV  
 return bRegistered; mahNQ5W*)  
} =+I-9=  
<M}O&?N 8x  
  四、小结 g/\cN(X  
!H<%X~|,  
  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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