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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: |bQX9|L  
  $73j*@EQA  
  一、实现方法 JM5 w`=  
SxMrX C*  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 0`=#1u8  
3~"G(UP  
#pragma data_seg("shareddata") 6i/x"vl>  
HHOOK hHook =NULL; //钩子句柄 k zhek >  
UINT nHookCount =0; //挂接的程序数目 `A@{})+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .6%-Il  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @[0zZX2EE  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !>B|z=  
static int KeyCount =0; y4aSf2   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 uBLI!N-G  
#pragma data_seg() 4P@Ak7iL(V  
-LL49P6  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ,K Ebnk|i  
]KfjZ!Qh  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'AN3{  
^)&d7cSc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `7qZ6Z3z@  
cKey,UCHAR cMask) n?*Fr sZ  
{ WJ$D]7  
 BOOL bAdded=FALSE; +0mU)4n/  
 for(int index=0;index<MAX_KEY;index++){ c&.>SR')  
  if(hCallWnd[index]==0){ w66iLQ\@  
   hCallWnd[index]=hWnd; DfP4 `  
   HotKey[index]=cKey; V6Kw71'9  
   HotKeyMask[index]=cMask; 5" <7  
   bAdded=TRUE; 9L;fT5Tp7  
   KeyCount++; q"OvuHBSOn  
   break; Xc;W9e(U  
  } R]e?<,"X  
 } 1.YDIB||  
 return bAdded; GU'/-6-T  
} JQQP!]%}  
//删除热键 0R&$P 6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ftB-gItV  
{ d^sS{m\  
 BOOL bRemoved=FALSE; ZI4[v>  
 for(int index=0;index<MAX_KEY;index++){ s^F6sXhyPi  
  if(hCallWnd[index]==hWnd){ p`lv$ @q'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m.ev~Vv~  
    hCallWnd[index]=NULL; lAU`7uE  
    HotKey[index]=0; s86Ij>VLf  
    HotKeyMask[index]=0; HV@ C@wmg  
    bRemoved=TRUE; =n>&Bl-Bl  
    KeyCount--; n}cjVH5  
    break; m,KG}KX  
   } P!@b:.$  
  } VWqmqR%  
 } };"-6e/9  
 return bRemoved; $_NYu  
} XlP q>@4p  
o.IJ4'}aN  
t'Zq>y;yg  
  DLL中的钩子函数如下: R&Y+x;({  
mOG;[CB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?5(Cwy ?  
{ OKs1irt5  
 BOOL bProcessed=FALSE; YCr:nYm<f  
 if(HC_ACTION==nCode) *#p}>\Y{  
 { W8{g<. /  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 D4nYyj1O3  
   switch(wParam) ,TL8`  
   {  M?mPi 3  
    case VK_MENU: RV^ N4q4  
     MaskBits&=~ALTBIT; ZoJ_I >uv  
     break; %mKM9>lf#  
    case VK_CONTROL: .|Unq`ll  
     MaskBits&=~CTRLBIT; Yxik .S+G  
     break; z2'3P{#s  
    case VK_SHIFT: )5n*4A  
     MaskBits&=~SHIFTBIT; oD1rt>k  
     break; <y4hK3wP  
    default: //judge the key and send message u7  s-  
     break; ~jcdnm]  
   } VZhtx)  
   for(int index=0;index<MAX_KEY;index++){ RLl*@SEi"  
    if(hCallWnd[index]==NULL) EjxzX1:  
     continue; FfEP@$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t!^ j0q  
    { ;1x(~pD*o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'Lm\ r+$F  
     bProcessed=TRUE; tZ|0wPp  
    } D@.+B`bA  
   } vH14%&OcN  
  } LC8&},iu  
  else if((lParam&0xc000ffff)==1){ //有键按下 JTg:3<L  
   switch(wParam) 2h=QJgpCG  
   { -d'swx2aZ!  
    case VK_MENU: {,;R\)8D  
     MaskBits|=ALTBIT; :{7gZ+*  
     break; nulLK28q  
    case VK_CONTROL: LR`]C]  
     MaskBits|=CTRLBIT; *z?Vy<u G  
     break; -!Ov{GHr0  
    case VK_SHIFT: W"3YA+qpI  
     MaskBits|=SHIFTBIT; pUV4oyGV   
     break; 'tJb(X!]q  
    default: //judge the key and send message 85e!)I_  
     break; UO~Xzx!e  
   } /+ yIcE(&3  
   for(int index=0;index<MAX_KEY;index++){ X0FTD':f  
    if(hCallWnd[index]==NULL) A!GQ4.~%  
     continue; 1@}s:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a8w/#!^34  
    { 8u|F %Sg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q0sdL86  
     bProcessed=TRUE; ja2BK\"1:  
    }  Y%zYO  
   } ov$S   
  } MP6Py@J45  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 BmhIKXE{*  
   for(int index=0;index<MAX_KEY;index++){ woyn6Z1JQ  
    if(hCallWnd[index]==NULL) *!5X!\e_  
     continue; $:}sm0;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H*KZZTKd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BbC aIt  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 UlD]!5NO  
   } >{1 i8 b@  
  } Bw Cwy  
 } &@U)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O'.sK pXe  
} -\I".8"YE  
wSPwa,)7s  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Oj]4jRew  
~q,Wj!>Ob  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -Cc2|~n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fi8#r)G.  
}trQ<*D  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: o,yZ1"  
w f""=;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0\KDa$ '1k  
{ X%R)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "lnI@t{o  
 { )YY8`\F>1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T`W37fz0  
  SaveBmp(); qA>C<NL  
  return FALSE; \N a  
 } [,TK"  
 …… //其它处理及默认处理 aB^`3J  
} 60XTdJkDkA  
j 21>\K!p  
79d< ,q;uR  
  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。 []<N@a6VA>  
q Oyo+hu  
  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。 shuoEeoo  
)u>/:  
  二、编程步骤 "NvB@>S  
I~T~!^}U  
  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"; |_u|Td(n  
fl+dL#]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z;lWr(-x  
i-M<_62c  
  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; C+vk9:"  
['_W <  
  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; uZXG"  
'q7&MM'oS^  
  5、 添加代码,编译运行程序。 M d.^r5r  
nq 9{{oe  
三、程序代码 ,T0q.!d  
a+ s%9l  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \xjI=P'-25  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) RN ~pC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9/dI 6P7  
#if _MSC_VER > 1000 I!u fw\[  
#pragma once k.?@qCs[  
#endif // _MSC_VER > 1000 fK10{>E1  
#ifndef __AFXWIN_H__ -:|t^RM;FT  
#error include 'stdafx.h' before including this file for PCH Jk_ }y  
#endif UE 1tm  
#include "resource.h" // main symbols >vZ^D  
class CHookApp : public CWinApp AkA2/7<[  
{ &w{: qBa  
 public: 1JY3c M  
  CHookApp(); #sb@)Q  
  // Overrides bq"dKN`  
  // ClassWizard generated virtual function overrides dw3H9(-lp  
  //{{AFX_VIRTUAL(CHookApp) fa 2hQJ02  
 public: 8?G534*r@2  
  virtual BOOL InitInstance(); T3In0LQ  
  virtual int ExitInstance(); uU!}/mbo  
  //}}AFX_VIRTUAL 3) _(t.$D  
  //{{AFX_MSG(CHookApp) 9PWqoz2c  
  // NOTE - the ClassWizard will add and remove member functions here. 2T3b6  
  // DO NOT EDIT what you see in these blocks of generated code ! arb'.:[z^  
  //}}AFX_MSG `c'R42S A  
  DECLARE_MESSAGE_MAP() H57wzG{xG  
}; \PM5B"MDZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); p#>d1R1&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P*3PDa@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &e;GoJ  
BOOL InitHotkey(); :0vKt 6>Sp  
BOOL UnInit(); m?`?T   
#endif r@ v&~pL  
Q=#@g  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?xYoCn}Z  
#include "stdafx.h" 4&wwmAp^  
#include "hook.h" '=cAdja  
#include <windowsx.h> NzG] nsw  
#ifdef _DEBUG VZCCMh-  
#define new DEBUG_NEW l]F)]>AE  
#undef THIS_FILE _7N^<'B  
static char THIS_FILE[] = __FILE__; e)2w&2i`(F  
#endif LHHDD\X   
#define MAX_KEY 100 lj"72   
#define CTRLBIT 0x04 9 M!U@>  
#define ALTBIT 0x02 {7+y56[yu  
#define SHIFTBIT 0x01 <gjA(xT5  
#pragma data_seg("shareddata") VD+y4t'^  
HHOOK hHook =NULL; {/q4W; D  
UINT nHookCount =0; JXk<t5@D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey C~8;2/F7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &0JCZ /e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #Y<(7  
static int KeyCount =0; `Uy4>?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <a)L5<#  
#pragma data_seg() U_ *K%h\m  
HINSTANCE hins; $-"V 2  
void VerifyWindow(); <S(`e/#[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ztj~Q9mu  
//{{AFX_MSG_MAP(CHookApp) T56%3i  
// NOTE - the ClassWizard will add and remove mapping macros here. ibv.M=  
// DO NOT EDIT what you see in these blocks of generated code! O%p+P<J  
//}}AFX_MSG_MAP 4NRG{FZ9  
END_MESSAGE_MAP() GCv*a[8?n  
Gu5%Pou  
CHookApp::CHookApp() *;Gnod<  
{ mFW/xZwR,5  
 // TODO: add construction code here, ?@5#p*u0  
 // Place all significant initialization in InitInstance Ob m%\h  
} q !Nb-O{  
|QxT"`rT  
CHookApp theApp; #*x8)6Ct  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CK#SD|~:  
{ ZFa<{J<2  
 BOOL bProcessed=FALSE; 'X/(M<c  
 if(HC_ACTION==nCode) P"ATqQG%D  
 { 3FhkK/@  
  if((lParam&0xc0000000)==0xc0000000){// Key up |!\5nix3A>  
   switch(wParam) 9 t o2V  
   { 'o% .Q x  
    case VK_MENU: LL7un_EC  
     MaskBits&=~ALTBIT; boWaH}?0'  
     break; #xe-Yw1!  
    case VK_CONTROL: dBM> ;S;v  
     MaskBits&=~CTRLBIT; $C`YVv%?0  
     break; )R5=GHmL  
    case VK_SHIFT: y-k]Tr  
     MaskBits&=~SHIFTBIT; /d prs(*K  
     break; Z9k"&F ~u}  
    default: //judge the key and send message ZGbY  
     break; 7B8.;0X$W  
   } T<S_C$O  
   for(int index=0;index<MAX_KEY;index++){ sB'Z9  
    if(hCallWnd[index]==NULL) I%gDqfdL  
     continue; aOK,Mm:iO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SVj4K \F  
    { d|RDx;r l8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,BuEX#ZaBl  
     bProcessed=TRUE; 0w<G)p~%n  
    } xYl ScM_~  
   } 3*;S%1C^  
  } 3_cZaru  
  else if((lParam&0xc000ffff)==1){ //Key down ;+Uc} =  
   switch(wParam) 3 V{&o,6  
   { R@Bnrk  
    case VK_MENU: a?5R ;I B  
     MaskBits|=ALTBIT; `8<h aU  
     break; 9&7$oI$!J  
    case VK_CONTROL: &&er7_Q  
     MaskBits|=CTRLBIT; mjXO}q7  
     break; 2j( ]Bt:  
    case VK_SHIFT: Q]"u?Q]  
     MaskBits|=SHIFTBIT; H6/C7  
     break; iQj2aK Gs  
    default: //judge the key and send message 6}S1um4 F  
     break; 1 wB2:o<  
   } vivU4:uH3  
   for(int index=0;index<MAX_KEY;index++) cs6I K6wo  
   { DP<[Uz&  
    if(hCallWnd[index]==NULL) 'awZ-$#  
     continue; Z%1{B*(e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -/z#?J\  
    { jpI=B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HMrl!;:  
     bProcessed=TRUE; 9m:G8j'  
    } -&3mOn& (1  
   }  ZXL  
  } ;0 No@G;z  
  if(!bProcessed){ <oP"kh<D4  
   for(int index=0;index<MAX_KEY;index++){ b i 8Qbo4  
    if(hCallWnd[index]==NULL) !w #x@6yq  
     continue; bX*c-r:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0b~{l;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [23F0-p  
   } @h$4Mt7N  
  } 6l|,J`G  
 } %tC3@S  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g9K7_T #W  
} b2p;-rv  
z=/xv},  
BOOL InitHotkey() w,qYT -R  
{ L4?)N&V  
 if(hHook!=NULL){ yB~` A>~M  
  nHookCount++; o6LZ05Z-&  
  return TRUE; %A ^qm  
 } t3b64J[A{  
 else ="=Aac#n`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^N`bA8  
  if(hHook!=NULL) 2^.qKY@g@  
   nHookCount++; r"uOf;m  
  return (hHook!=NULL); e6JT|>9A7  
} <!qv$3/7  
BOOL UnInit() %e,X7W`'2  
{ 6}aH>(3!A  
 if(nHookCount>1){ SC 6cFyp2  
  nHookCount--; tbr1mw'G  
  return TRUE; Rz_fNlA  
 } aO'lk  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L@t}UC  
 if(unhooked==TRUE){ FPB O=?H.  
  nHookCount=0; 7[}K 2.W.  
  hHook=NULL; !f^'-  
 } O?I~XM'S  
 return unhooked; f3u^:6U~  
} bw\a\/Dw  
4?s ~S. %  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z%cpV{Nu  
{ X\dPQwasM  
 BOOL bAdded=FALSE; b9(_bsc  
 for(int index=0;index<MAX_KEY;index++){ N-g=_86C"  
  if(hCallWnd[index]==0){ !gm;g}]szG  
   hCallWnd[index]=hWnd; xct{Tv[FO  
   HotKey[index]=cKey; 'Lb- +X,  
   HotKeyMask[index]=cMask; D:yj#&I  
   bAdded=TRUE; %Gk?f=e  
   KeyCount++; }#3'72  
   break; v|r=}`k=  
  } X$<s@_#1  
 } i{9_C/  
 return bAdded; NWt`X!  
} >%o\Ue  
@},25"x)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xpb,Nzwt^  
{ K Qz.g3,  
 BOOL bRemoved=FALSE; ^lp#j;Df  
 for(int index=0;index<MAX_KEY;index++){ v9t26>{~  
  if(hCallWnd[index]==hWnd){ FYs-vW{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (<"uV%1  
    hCallWnd[index]=NULL; >5aZ?#TS1  
    HotKey[index]=0; Wt%+q{  
    HotKeyMask[index]=0; (pl|RmmDz  
    bRemoved=TRUE; U^n71m>]%T  
    KeyCount--; 5ZXP$.  
    break; zP8a=Iv  
   } hPP,D\#  
  } Br,^4w[Hq  
 } zB?} {@  
 return bRemoved; ~T{^7"q\  
} $@[`v0y*  
7l%]/`Y-  
void VerifyWindow() );]9M~$  
{ W@vt6v  
 for(int i=0;i<MAX_KEY;i++){ gNsas:iGM  
  if(hCallWnd!=NULL){ :?*|Dp1  
   if(!IsWindow(hCallWnd)){ Qrnc;H9)  
    hCallWnd=NULL; =Z3{6y}3p  
    HotKey=0; i1OF @~?  
    HotKeyMask=0; ^{IF2_h"  
    KeyCount--; _>G.  
   } mip2=7M|C  
  } q$|Wxnz  
 } /*zngp @  
} /{[Y l[{"<  
biBo?k;4  
BOOL CHookApp::InitInstance() ?nLlZpZ2v  
{ x e~lV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); eNwF<0}  
 hins=AfxGetInstanceHandle(); i; qb\  
 InitHotkey(); 9ff6Apill  
 return CWinApp::InitInstance(); TQ/EH~Sz  
} :?2@qWaL  
eWgqds&#  
int CHookApp::ExitInstance() &y7<h>z  
{ p>g5WebBN  
 VerifyWindow(); kK0.j)(  
 UnInit(); /e2CB"c   
 return CWinApp::ExitInstance(); u["3| `C5  
} K-a~Kr  
lR[]A  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ke*tLnO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <WHu</  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hLv~N}  
#if _MSC_VER > 1000 ho'Ihep,L  
#pragma once Q1b<=,  
#endif // _MSC_VER > 1000 1I=>0 c  
k Y}r^NaQA  
class CCaptureDlg : public CDialog o4^|n1vN  
{ )V6Bzn}9  
 // Construction ccdP}|9e  
 public: Ao0p=@Y  
  BOOL bTray; 3Uy48ue  
  BOOL bRegistered; Z8Jrt3l{2  
  BOOL RegisterHotkey(); ep$C nBwE  
  UCHAR cKey; +.EP_2f9  
  UCHAR cMask; A(2\Gfe  
  void DeleteIcon(); \~(scz$  
  void AddIcon(); sa7F-XM  
  UINT nCount;  [f1'Qb  
  void SaveBmp(); Wq+a5[3"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor U5iyvU=UG  
  // Dialog Data _x2i=SFo*$  
  //{{AFX_DATA(CCaptureDlg) lWR".  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6dN W2_  
  CComboBox m_Key; {\-9^RL  
  BOOL m_bControl; pGsk[.  
  BOOL m_bAlt; ZNKopA(=|%  
  BOOL m_bShift; x(tf0[g  
  CString m_Path; Z]QpH<Z  
  CString m_Number; z>6hK:27  
  //}}AFX_DATA vOIzfwYG9  
  // ClassWizard generated virtual function overrides lB(E:{6OZ  
  //{{AFX_VIRTUAL(CCaptureDlg) #B^A"?*S  
 public: }MiEbLduN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Z)7|m  
 protected: &>xd6-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +wHrS}I#g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *6` };ASK  
  //}}AFX_VIRTUAL . XVW2ISv  
  // Implementation -_KO}_  
 protected: -Gyj]v5y`c  
  HICON m_hIcon; QyEGK  
  // Generated message map functions |c)hyw?[Y  
  //{{AFX_MSG(CCaptureDlg) okkMx"  
  virtual BOOL OnInitDialog(); gic!yhsS_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \,ko'4 8@  
  afx_msg void OnPaint(); l} =@9A@  
  afx_msg HCURSOR OnQueryDragIcon(); LK}*k/eG  
  virtual void OnCancel(); !!\x]$v  
  afx_msg void OnAbout(); <Crbc$!OeX  
  afx_msg void OnBrowse(); .*k$abb  
  afx_msg void OnChange(); "T4buTXJ  
 //}}AFX_MSG ~85>.o2RDW  
 DECLARE_MESSAGE_MAP() S%p.|!  
}; )s~szmJoVD  
#endif w2(pgWed  
579<[[6~d2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f =MP1q[  
#include "stdafx.h" Zn{Y+ce7d  
#include "Capture.h" _Oc(K "v  
#include "CaptureDlg.h" wV\.NQtS  
#include <windowsx.h> Rh :|ij>B  
#pragma comment(lib,"hook.lib") 3Jh!YzI8  
#ifdef _DEBUG oO4hBM([  
#define new DEBUG_NEW *mjPNp'3{m  
#undef THIS_FILE bP)( 4+t~  
static char THIS_FILE[] = __FILE__; wsEOcaie  
#endif o FS2*u  
#define IDM_SHELL WM_USER+1 xiy=D5N.=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PY76;D*`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hQ@E2Xsv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; kQw%Wpuq[/  
class CAboutDlg : public CDialog EpU}~vC9C  
{ 9q]n &5  
 public: cfC}"As  
  CAboutDlg(); x+8%4]u`  
  // Dialog Data sP~;i qk  
  //{{AFX_DATA(CAboutDlg) ey@{Ng#  
  enum { IDD = IDD_ABOUTBOX }; W QqOXF  
  //}}AFX_DATA 7ND4Booul  
  // ClassWizard generated virtual function overrides AaLbJYuKd  
  //{{AFX_VIRTUAL(CAboutDlg) QJF_ "  
 protected: }Y!v"DO#Q*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `>Ms7G9S~e  
  //}}AFX_VIRTUAL ^jE8 "G*  
  // Implementation O~#A )d6  
 protected: TZ#^AV=ae  
  //{{AFX_MSG(CAboutDlg) x8o/m$[,=u  
  //}}AFX_MSG JLak>MS  
  DECLARE_MESSAGE_MAP() GDQQ4-|O  
}; ]YrgkC35  
*| as-!${k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) sLd%m+*p  
{ B8~bx%)3T  
 //{{AFX_DATA_INIT(CAboutDlg) %uz6iQaq]X  
 //}}AFX_DATA_INIT 5VSc5*[  
} Ce/D[%  
:;jRAjq"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pv,z$3Q  
{ ](^FGz  
 CDialog::DoDataExchange(pDX); CT/>x3o  
 //{{AFX_DATA_MAP(CAboutDlg) >VppM  `  
 //}}AFX_DATA_MAP `Y3\R#  
} 84 <zTmm  
b$sT`+4q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 30YH}b#B  
 //{{AFX_MSG_MAP(CAboutDlg) OkMAqS  
 // No message handlers oDWNOw  
 //}}AFX_MSG_MAP >*EJ6FPO  
END_MESSAGE_MAP() u%5 ,U-  
`{NbMc\ ]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) OQVo4yl"  
: CDialog(CCaptureDlg::IDD, pParent) 'vV+Wu#[  
{ n5y0$S/ D  
 //{{AFX_DATA_INIT(CCaptureDlg) X o[GD`t  
  m_bControl = FALSE; Oq:$GME  
  m_bAlt = FALSE;  `7oYXk  
  m_bShift = FALSE; Mp(;PbVD  
  m_Path = _T("c:\\"); MkWbPm)  
  m_Number = _T("0 picture captured."); 2Vs+8/  
  nCount=0; Z4g<Ys*  
  bRegistered=FALSE; OVE?;x>n/1  
  bTray=FALSE; lQv (5hIm  
 //}}AFX_DATA_INIT B%5"B} nG  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 89{`GKWX  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^\r{72!y  
} BY':R-~(  
qfRrX"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [ ~kS)  
{ $-.*8*9  
 CDialog::DoDataExchange(pDX); 1@9M[_<n5  
 //{{AFX_DATA_MAP(CCaptureDlg) v3(0Mu0J  
  DDX_Control(pDX, IDC_KEY, m_Key); 4y!GFhMh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); f ~bgZ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >DN^',FEm  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |v<4=/.  
  DDX_Text(pDX, IDC_PATH, m_Path); >U(E \`9D  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _:FD#5BZ1  
 //}}AFX_DATA_MAP qTN30(x2  
} +??pej]Rp  
.HRd6O;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]=59_bkD:s  
//{{AFX_MSG_MAP(CCaptureDlg) wr~Qy4 ny  
 ON_WM_SYSCOMMAND() vQj{yJ\l1  
 ON_WM_PAINT() ~qX wQ@  
 ON_WM_QUERYDRAGICON() 2`> (LH  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b`ksTO`}x  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Lhrlz,1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) BqM[{Kv  
//}}AFX_MSG_MAP $.31<@T7  
END_MESSAGE_MAP() r%>EiHpCU  
rV2>;FG  
BOOL CCaptureDlg::OnInitDialog() mo,"3YW  
{ 4G hg~0  
 CDialog::OnInitDialog(); er2;1TW3E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~f( #S*Ic  
 ASSERT(IDM_ABOUTBOX < 0xF000); kWs:7jiiu  
 CMenu* pSysMenu = GetSystemMenu(FALSE); t~.^92]s|  
 if (pSysMenu != NULL) %NfH`%`  
 { /iJsa&W}  
  CString strAboutMenu; OL^DuoB4q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8#9OSupp  
  if (!strAboutMenu.IsEmpty()) c(Fo-4K  
  { vE)d0l"  
   pSysMenu->AppendMenu(MF_SEPARATOR); M'oQ<,yW-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); uax kGEXr  
  }  v&7x ~!O  
 } Y&y<WN}Q  
 SetIcon(m_hIcon, TRUE); // Set big icon F=f9##Y?7M  
 SetIcon(m_hIcon, FALSE); // Set small icon : qV|rih_Q  
 m_Key.SetCurSel(0); '#~Sb8   
 RegisterHotkey(); yVJ)JhV  
 CMenu* pMenu=GetSystemMenu(FALSE); R;uP^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?%/*F<UVQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v+dT7* ^@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZmI#-[/  
 return TRUE; // return TRUE unless you set the focus to a control T b*Q4:r"  
} \lyHQ-gWhc  
W 9bpKmc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) w;J#+ik  
{ KqNsCT+j  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2d<`dQY{l3  
 { . ywVGBvJ  
  CAboutDlg dlgAbout; M?kXzb\O  
  dlgAbout.DoModal(); 2%MS$Fto  
 } MW=rX>tE  
 else U;gy4rj  
 { \tdYTb.  
  CDialog::OnSysCommand(nID, lParam); rKl  
 } clM6R  
} h9~oS/%:  
x7xQrjE  
void CCaptureDlg::OnPaint() 5rJ7CfVq  
{ 8P2_/)|  
 if (IsIconic()) nrM-\'  
 { yPH5/5;,  
  CPaintDC dc(this); // device context for painting uFOYyrESc  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); e C&!yY2g  
  // Center icon in client rectangle &*~_ "WyU  
  int cxIcon = GetSystemMetrics(SM_CXICON); #Q|ACNpYM  
  int cyIcon = GetSystemMetrics(SM_CYICON); mH'om SCz  
  CRect rect; WTZuf9:  
  GetClientRect(&rect); e^hI[LbNC  
  int x = (rect.Width() - cxIcon + 1) / 2; yQC8Gt8  
  int y = (rect.Height() - cyIcon + 1) / 2; G52z5-=v  
  // Draw the icon qc6d,z/  
  dc.DrawIcon(x, y, m_hIcon); =z}M(<G  
 } ZrWA,~;  
 else D5!I{hp"  
 { >a: 6umY  
  CDialog::OnPaint(); )U{IQE;T#  
 } -V||1@ |  
} KU_""T  
y"ms;w'z  
HCURSOR CCaptureDlg::OnQueryDragIcon() !Eb!y`jK  
{ }]j#C  
 return (HCURSOR) m_hIcon; '8|joj>G=  
} _No<fz8  
uecjR8\e  
void CCaptureDlg::OnCancel() [ _&z+  
{ 1xsB@D  
 if(bTray) IZZ $p{  
  DeleteIcon(); ^i17MvT'  
  CDialog::OnCancel(); eak+8URo  
} !GoHCe[10  
,^qHl+'  
void CCaptureDlg::OnAbout() @Sz7*p  
{ !Ee&e~"  
 CAboutDlg dlg; l/bZE.GJ  
 dlg.DoModal(); kfy|3KA3m  
} (vbI4&r  
.Kk'N  
void CCaptureDlg::OnBrowse() *GM.2``e  
{ s%)>O{{)  
 CString str; nsi&r  
 BROWSEINFO bi; D(M^%z2N  
 char name[MAX_PATH]; =|q@ Q`DB  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e:=+~F(f  
 bi.hwndOwner=GetSafeHwnd(); E^V4O l<  
 bi.pszDisplayName=name; _MUSXB'  
 bi.lpszTitle="Select folder"; rd}|^&e!Dy  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wmFS+F4`2  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); DbK-3F_  
 if(idl==NULL) ef -PlGn  
  return; `qj24ehc  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l~GcD  
 str.ReleaseBuffer(); ~a.ei^r  
 m_Path=str; DX8pd5 U  
 if(str.GetAt(str.GetLength()-1)!='\\') Y/G~P,9  
  m_Path+="\\"; 'E#Bz"T  
 UpdateData(FALSE); etH]-S  
} rs:a^W5t  
u/X1v-2  
void CCaptureDlg::SaveBmp() Y kcN-  
{  :O{ ZZ  
 CDC dc; Wj31mV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); nSh}1Arp/  
 CBitmap bm; c=~FXV!  
 int Width=GetSystemMetrics(SM_CXSCREEN); A\~tr   
 int Height=GetSystemMetrics(SM_CYSCREEN); R]Pv=fn  
 bm.CreateCompatibleBitmap(&dc,Width,Height); G^_fbrZjN  
 CDC tdc; 2<Q3-|/i  
 tdc.CreateCompatibleDC(&dc); i@STo7=  
 CBitmap*pOld=tdc.SelectObject(&bm); 8hm|9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0^&-j.9  
 tdc.SelectObject(pOld); ($Ck5`_MK  
 BITMAP btm; S%k](\7!  
 bm.GetBitmap(&btm); D]$X@2A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; jsnk*>j  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1A-ess\  
 BITMAPINFOHEADER bih; TClgywL  
 bih.biBitCount=btm.bmBitsPixel; JO"-"&>  
 bih.biClrImportant=0; e-e*%  
 bih.biClrUsed=0; @EzO bE{  
 bih.biCompression=0; v6`TbIq%  
 bih.biHeight=btm.bmHeight; uP veAK}h  
 bih.biPlanes=1; %,[p[`NRYR  
 bih.biSize=sizeof(BITMAPINFOHEADER); nRlvW{p;  
 bih.biSizeImage=size; Fb9!x/$tGV  
 bih.biWidth=btm.bmWidth; l|p \8=  
 bih.biXPelsPerMeter=0; {%Q &CQG_  
 bih.biYPelsPerMeter=0; a}MSA/K(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6Cd% @Q2cr  
 static int filecount=0; Y1Qg|U o  
 CString name; f|X./J4Bl  
 name.Format("pict%04d.bmp",filecount++); ts3BmfR?  
 name=m_Path+name; l2LUcI$ x  
 BITMAPFILEHEADER bfh; r^|AiYI)  
 bfh.bfReserved1=bfh.bfReserved2=0; |VRzIA4M\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); WGeTL`}dh  
 bfh.bfSize=54+size; Z:(yX0U,[  
 bfh.bfOffBits=54; Ot#O];3  
 CFile bf; (( D*kd"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %d/Pc4gfc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  B1!b@0^  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "=97:H{!  
  bf.WriteHuge(lpData,size); ee|i  
  bf.Close(); W{!GL  
  nCount++; * vMNv  
 } >uN)O-  
 GlobalFreePtr(lpData); EgT2a  
 if(nCount==1) 8NRc+@f|m  
  m_Number.Format("%d picture captured.",nCount);  DlWnz-  
 else z rg#BXj7  
  m_Number.Format("%d pictures captured.",nCount); DZI:zsf;5Q  
  UpdateData(FALSE); ~\^h;A'3  
} dE[nPtstb  
"A6T'nOP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6.!Cm$l  
{ "+6:vhP5  
 if(pMsg -> message == WM_KEYDOWN) 0*F{=X~L  
 { mu?6Phj  
  if(pMsg -> wParam == VK_ESCAPE) N=QeeAI}}m  
   return TRUE; NBUSr}8|  
  if(pMsg -> wParam == VK_RETURN) ?!:$Z4G  
   return TRUE; $\ 0d9^)&  
 } "#a_--"k9  
 return CDialog::PreTranslateMessage(pMsg); m6 )sX&  
} 9{;cp?\)M  
lo%:$2*'p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dBKceL v  
{ ^\z.E?v%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v;q<h  
  SaveBmp(); g0P^O@8  
  return FALSE; o6PDCaT7  
} LyRU2A  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,&1DKx  
 CMenu pop; /"Bm1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~ "^]\3#  
 CMenu*pMenu=pop.GetSubMenu(0); /~49.}yt  
 pMenu->SetDefaultItem(ID_EXITICON); wIv_Z^% V  
 CPoint pt; r pv`%  
 GetCursorPos(&pt); hf/6VlZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [q/tKdo@  
 if(id==ID_EXITICON)  f:_\S  
  DeleteIcon(); B}%B4&Ij  
 else if(id==ID_EXIT) iG\ ]  
  OnCancel(); =,/08Cs  
 return FALSE; ~JJuM  
} _k0 X)N+li  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t4a/\{/#9|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oA^aT:o +  
 AddIcon(); {R2gz]v4  
 return res; (~R[K,G  
} x:h0/f  
^ di[J^  
void CCaptureDlg::AddIcon() Q -!,yCu  
{ X*'tJN$  
 NOTIFYICONDATA data; %>dCAj"  
 data.cbSize=sizeof(NOTIFYICONDATA); &i&k 4  
 CString tip; nhfHY-l} 7  
 tip.LoadString(IDS_ICONTIP); ;b(*Bh<  
 data.hIcon=GetIcon(0); vo9DmW  
 data.hWnd=GetSafeHwnd(); ?R7>xrp5  
 strcpy(data.szTip,tip); +:hZ,G?>  
 data.uCallbackMessage=IDM_SHELL; l\PDou@5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tgy= .o]  
 data.uID=98; G@YX8!w U  
 Shell_NotifyIcon(NIM_ADD,&data); W 6_~.m"b  
 ShowWindow(SW_HIDE); tOJK~%'  
 bTray=TRUE; 3D)gy9T&l  
} :^c ' P<HM  
aZ[ aZU  
void CCaptureDlg::DeleteIcon() v"y0D  
{ 9] i$`y  
 NOTIFYICONDATA data; HLL[r0P`F  
 data.cbSize=sizeof(NOTIFYICONDATA); E?{{z4  
 data.hWnd=GetSafeHwnd(); K,uTO7Mk[  
 data.uID=98; F/MzrK\':m  
 Shell_NotifyIcon(NIM_DELETE,&data); g"Eg=CU  
 ShowWindow(SW_SHOW); *Nv!Kuk  
 SetForegroundWindow(); DB1GW,  
 ShowWindow(SW_SHOWNORMAL); "pP5;*^f  
 bTray=FALSE; ]}KoW?M  
} 5_bIc=L1  
-Wp69DP6q  
void CCaptureDlg::OnChange() aq'd C=y  
{ {`2R<O  
 RegisterHotkey(); @8IY J{=  
}  .AEOf0t  
z:RclDm  
BOOL CCaptureDlg::RegisterHotkey() ttazY#  
{ 80PlbUBb!  
 UpdateData(); yc./:t1at>  
 UCHAR mask=0; yv.Y-c=  
 UCHAR key=0; G#V}9l8 Q  
 if(m_bControl) W/z\j/Rgc  
  mask|=4; S >E|A %  
 if(m_bAlt) Z3:M%)e_u$  
  mask|=2; 2_^{Vez@I  
 if(m_bShift) mI55vNyer  
  mask|=1; TTg>g~t`  
  key=Key_Table[m_Key.GetCurSel()]; F[q:jY  
 if(bRegistered){ 0_Gi1)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rgQ6/3}qc  
  bRegistered=FALSE; 6`sOhVD  
 } czMu<@c [  
 cMask=mask; 8.Q;o+NU  
 cKey=key; g+5{&YD  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); k+X=8()k  
 return bRegistered; yY,O=yOjq  
} l,FK\  
Kjbz\~  
  四、小结 sE*A,z?  
X#l]%IrW!  
  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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