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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: 5*s1qA0^  
  O"_erH\nk  
  一、实现方法 2rK-X_}  
.`oJcJ  
  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: YD/B')/ s  
}*fW!(*  
#pragma data_seg("shareddata") /e-ka{WS  
HHOOK hHook =NULL; //钩子句柄 I-RdAVB/Ep  
UINT nHookCount =0; //挂接的程序数目 D6&mf2'u  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pFpQ\xc9$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 kx"hWG4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey " #mXsp-ut  
static int KeyCount =0; [}W^4,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ?noETHz)  
#pragma data_seg() DFt=%aV[  
_hAj2%SL  
  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。 #rn4 $  
(lyt"Ty  
  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: @<@R=aqE  
%8}WX@SB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ua]\xBWx  
cKey,UCHAR cMask) (SgEt  
{ 9f\aoVX  
 BOOL bAdded=FALSE; `c qH}2s#  
 for(int index=0;index<MAX_KEY;index++){ {AU` }*5  
  if(hCallWnd[index]==0){ c,v^A+sZu  
   hCallWnd[index]=hWnd; ]jVIpGM  
   HotKey[index]=cKey; oj,HJH+  
   HotKeyMask[index]=cMask; 9[epr+f  
   bAdded=TRUE; Jcwh|w9D8  
   KeyCount++; g|&.v2 '  
   break; J8sJ~FnUj  
  } J6*\>N5W  
 } {pcf;1^t  
 return bAdded; kj Lsk-  
} H(5S Kv5  
//删除热键 }aHB$}"!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _~X8/p/Qh  
{ B-y0;0  
 BOOL bRemoved=FALSE; E %wV  
 for(int index=0;index<MAX_KEY;index++){ n9<roH  
  if(hCallWnd[index]==hWnd){ !(MA5L-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q%,o8E2~  
    hCallWnd[index]=NULL; VYl_U?D  
    HotKey[index]=0; fWtb mUq  
    HotKeyMask[index]=0; A&NC0K}G!  
    bRemoved=TRUE; D\45l  
    KeyCount--; ifJv~asp   
    break; J)7,&Gc6  
   } p=8M0k  
  } _Ewy^;S%L  
 } xh+AZ3  
 return bRemoved; "K}W^J9v  
} 5t"bCzp  
.RQXxw  
Ct =E;v7}  
  DLL中的钩子函数如下: _Ep{|]:gw  
~>}dse  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \j2 : 6]Hm  
{ ct2_N  
 BOOL bProcessed=FALSE; "v\ bMuS  
 if(HC_ACTION==nCode) Q{H!s_6iyv  
 { 2 Ft0C2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 XhlI|h-j  
   switch(wParam) ;X*K*q  
   {  zumR(<l  
    case VK_MENU: 'mBLf&fB  
     MaskBits&=~ALTBIT; OEy:#9<'  
     break; sx)$=~o  
    case VK_CONTROL: KRnB[$3F1  
     MaskBits&=~CTRLBIT;  m+72C]9  
     break; z) ]BV=  
    case VK_SHIFT: |!4B Wt  
     MaskBits&=~SHIFTBIT; s]nGpA[!  
     break; C;58z 5*,  
    default: //judge the key and send message G:h;C].  
     break; 2g ?Jb5)  
   } =FtM;(\  
   for(int index=0;index<MAX_KEY;index++){ F- !}dzO  
    if(hCallWnd[index]==NULL) *7xQp!w^  
     continue; +YQ)}v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #"=yQZ6Y  
    { nU?Xc(Xy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {L-{Y<fke  
     bProcessed=TRUE; wRV`v$*6  
    } %mB!|'K%  
   } 8r`VbgI&  
  } =\ Tud-1Z  
  else if((lParam&0xc000ffff)==1){ //有键按下 W[[YOK1T  
   switch(wParam) fJF8/IQ4  
   { y]E)2:B[d  
    case VK_MENU: OVQxZ~uQ  
     MaskBits|=ALTBIT; {jx#^n&5R  
     break; ,{`o/F/  
    case VK_CONTROL: 0btmao-  
     MaskBits|=CTRLBIT; T0*TTB&b  
     break;  bbQ 10H  
    case VK_SHIFT: 8M3p\}O  
     MaskBits|=SHIFTBIT; xvdnEaWe$  
     break; IxEQh)J X  
    default: //judge the key and send message k"DQbUy0L  
     break; WRLu 3nBx  
   } (zM+7tJH  
   for(int index=0;index<MAX_KEY;index++){ 43}&w.AS  
    if(hCallWnd[index]==NULL) \0*yxSg,^  
     continue; >PTu*6Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /\3XARt  
    { `F- Dd4B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *FLTz(T  
     bProcessed=TRUE; T,xVQ4J?  
    } fr,CH{Uq  
   } VxPTh\O*[  
  } Y00i{/a 8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 bAy5/G!_R  
   for(int index=0;index<MAX_KEY;index++){ ?VOs:sln  
    if(hCallWnd[index]==NULL) nI|Lx`*v  
     continue; HkfSx rTgQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c~0VNuN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eHnei F  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 YVZSKU  
   } 5EV8zf  
  } qs8K jG@  
 } 3*2&Fw!B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {Gb)Et]<  
} gk_Xu  
&>) `P[x  
  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: A\PV@w%A i  
R^u^y{ohr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sxC{\iLY%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S{"6PXzb  
g*w-"%"O  
  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: -%/,j)VKD  
>ihe|WN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  ZZFI\o  
{ HZr/0I?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cVP49r}}v  
 { |$|nV^y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8tFyNl`c  
  SaveBmp(); d~z<,_ r5c  
  return FALSE;  7 zP  
 } (PT?h>|St  
 …… //其它处理及默认处理 g6a3MJV`  
} c J"]yG)=  
Bu >yRL=*  
'bY|$\I  
  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。 <8z[,X}bM  
um0}`Xq^  
  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。 1o6J9kCq^3  
w3?t})PB&  
  二、编程步骤 Kz*AzB  
}&C!^v o  
  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"; HU'`kimWb  
[%)B%h`XGf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {If2[4!z  
7N~qg 7&  
  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; #35S7G^@`  
)S;Xy`vO  
  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; `w+9j-  
q@RY.&mgW  
  5、 添加代码,编译运行程序。 O,xAu}6f+  
?BWvF]p5/  
三、程序代码 5@&i:vs5y  
ygy#^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hk$nlc|$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [>]VN)_J5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ u2.r,<rC*Q  
#if _MSC_VER > 1000 2S10j%EeI  
#pragma once @Qsg.9N3K  
#endif // _MSC_VER > 1000 &40JN}  
#ifndef __AFXWIN_H__ [Ey%uh 6*  
#error include 'stdafx.h' before including this file for PCH &LxzAL,3!  
#endif / jL{JF>I  
#include "resource.h" // main symbols  ?Ge*~d  
class CHookApp : public CWinApp m+gG &`&u  
{ %Pvb>U(Xs  
 public: !\k#{ 1[!  
  CHookApp(); y88}f&z#5  
  // Overrides X9`C2fyVd  
  // ClassWizard generated virtual function overrides :;#}9g9  
  //{{AFX_VIRTUAL(CHookApp) "}x70q'>S  
 public: uA}FuOE6  
  virtual BOOL InitInstance(); zl8\jP  
  virtual int ExitInstance(); +MoxvW6  
  //}}AFX_VIRTUAL b%~3+c  
  //{{AFX_MSG(CHookApp) KZ >"L  
  // NOTE - the ClassWizard will add and remove member functions here. 0@/E% T1c"  
  // DO NOT EDIT what you see in these blocks of generated code ! BRok 89  
  //}}AFX_MSG xg5@;p  
  DECLARE_MESSAGE_MAP() eEZlVHM;O  
}; I;m@cSJ|j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); @U.}Ei  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _TcQ12H 5<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kd4*Zab  
BOOL InitHotkey(); OsSiBb,W79  
BOOL UnInit(); \,#4+&4b  
#endif wm`"yNbD  
8JO\%DFJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vc1GmB  
#include "stdafx.h" ~4X!8b_  
#include "hook.h" Mw7UU1 ei  
#include <windowsx.h> Q+js2?7^  
#ifdef _DEBUG iC0,zk4&  
#define new DEBUG_NEW }~,cCtg:o  
#undef THIS_FILE J3SbyI!T  
static char THIS_FILE[] = __FILE__; Glc4g  
#endif A(sx5Ynp  
#define MAX_KEY 100 \hD bv5  
#define CTRLBIT 0x04 dSD}NM  
#define ALTBIT 0x02 9 v3Nba  
#define SHIFTBIT 0x01 &$Ip$"H  
#pragma data_seg("shareddata") 7XC}C+  
HHOOK hHook =NULL; pQ`L=#WM  
UINT nHookCount =0; 5<8>G?Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f2e$BA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT r|BKp,u9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {[y"]_B4  
static int KeyCount =0; ^ J@i7FOb  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !Kqj&y5  
#pragma data_seg() E1Aa2  
HINSTANCE hins; x=|@AFI  
void VerifyWindow(); {j4:. fD  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) w)SxwlW}  
//{{AFX_MSG_MAP(CHookApp) soK_l|z:J  
// NOTE - the ClassWizard will add and remove mapping macros here. \D k^\-  
// DO NOT EDIT what you see in these blocks of generated code! =y/ Lbe}:  
//}}AFX_MSG_MAP @%85k/(  
END_MESSAGE_MAP() Y$5v3E\uc  
Kyiez]T6%q  
CHookApp::CHookApp() DQXx}%Px  
{ 3>3ZfFC  
 // TODO: add construction code here, KEB>}_[  
 // Place all significant initialization in InitInstance EGO@`<"h  
} tD482Sb=  
U,}T ]J  
CHookApp theApp; T $]L 5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dOgM9P  
{ ptL}F~  
 BOOL bProcessed=FALSE; (:k`wh&  
 if(HC_ACTION==nCode) ]-OkW.8d1  
 { =U|SK"oO  
  if((lParam&0xc0000000)==0xc0000000){// Key up FOyfk$  
   switch(wParam) BrmFwXLP"  
   { 5W '|qmJ  
    case VK_MENU: WZ-{K"56  
     MaskBits&=~ALTBIT; Ybiz]1d  
     break; Z+Zh;Ms  
    case VK_CONTROL: %cjav  
     MaskBits&=~CTRLBIT; .tZ$a_O  
     break; 9e*poG  
    case VK_SHIFT: aV#;o9H{  
     MaskBits&=~SHIFTBIT; 9cPucKuj  
     break; hpKc_|un  
    default: //judge the key and send message :WTvP$R  
     break; S$:S*6M@"  
   } 'B:De"_(N  
   for(int index=0;index<MAX_KEY;index++){ QZP;k!"w  
    if(hCallWnd[index]==NULL) j`hbQp\`  
     continue; I=I%e3GEm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <xz-7EqbwX  
    { P?ol]MwaB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JH,bSb  
     bProcessed=TRUE; uT2cHzqKB  
    } 45JLx?rN_  
   } +@v} (  
  } QCnVZ" !(  
  else if((lParam&0xc000ffff)==1){ //Key down Y0'^S<ox  
   switch(wParam) 3{E}^ve  
   { Mi-9sW  
    case VK_MENU: +& Qqu`)?F  
     MaskBits|=ALTBIT; }('QIvq2  
     break; 6% axbB  
    case VK_CONTROL: K?eo)|4)DB  
     MaskBits|=CTRLBIT; IMEoov-x  
     break; +T;qvx6  
    case VK_SHIFT: ;:1mv  
     MaskBits|=SHIFTBIT; lK@r?w|<M  
     break; '*.};t~;"d  
    default: //judge the key and send message : P2;9+v  
     break; *xKR;?.  
   } t":>O0>cz  
   for(int index=0;index<MAX_KEY;index++) +}'K6x_  
   { %"B$I>h  
    if(hCallWnd[index]==NULL) ^el:)$  
     continue; Pk2 "\y@q/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :/Zh[Q@EG  
    { NE nP3A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x&p=vUuukP  
     bProcessed=TRUE; w-/Tb~#E  
    } -OAH6U9^  
   } zj4JWUM2  
  } sNTfRPC  
  if(!bProcessed){ Lj\<qF~n  
   for(int index=0;index<MAX_KEY;index++){ +fmZ&9hFNJ  
    if(hCallWnd[index]==NULL) 4K% YS  
     continue; "fwuvT 1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <VPtbM@(m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,^T2hY`  
   }  5 Ep  
  } '93&?  
 } c" HCc]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fTcRqov  
} ~=Sr0+vV  
;T(^riAEl  
BOOL InitHotkey() 93,ExgFt  
{ ,+{ 43;a  
 if(hHook!=NULL){ 2/WXdo  
  nHookCount++; ? 'nMZ  
  return TRUE; A O]e^Q  
 } BJTljg( {o  
 else XoOe=V?I )  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A&#Bf#!G  
  if(hHook!=NULL) KcE=m\h  
   nHookCount++; J0o[WD$A x  
  return (hHook!=NULL); !b_IH0]U  
} _l<"Qqt  
BOOL UnInit() "b;?2_w:E  
{ bSzb! hT`  
 if(nHookCount>1){ n9ih^H  
  nHookCount--; ?,[w6O*  
  return TRUE; ujBADDwOg)  
 } uWQ.h ,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ==9Ez  
 if(unhooked==TRUE){ B7C6Mau  
  nHookCount=0; co|0s+%PBq  
  hHook=NULL; }qg&2M%\  
 } Orgje@c{  
 return unhooked; ,.B8hr@H6-  
} &aU+6'+QXB  
8iB}a\]B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uNDkK o<M  
{ OYkd?LN  
 BOOL bAdded=FALSE; 1OKJE(T  
 for(int index=0;index<MAX_KEY;index++){ L M[<?`%p  
  if(hCallWnd[index]==0){ VB%xV   
   hCallWnd[index]=hWnd; 0rj*SC_  
   HotKey[index]=cKey; @(L|  
   HotKeyMask[index]=cMask; x(Z@ R\C-a  
   bAdded=TRUE; =>U~ligu  
   KeyCount++; 7;V5hul  
   break; "`wq:$R  
  } 2J5dZYW  
 } aY~IS?! ;  
 return bAdded; 'Z[R*Ikzq  
} dEn hNPeRl  
*BV .zbGm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #;)7~69  
{ S3r\)5%;  
 BOOL bRemoved=FALSE; s Y,3  
 for(int index=0;index<MAX_KEY;index++){ 78"W ~`8  
  if(hCallWnd[index]==hWnd){ VrG|/2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !.A>)+AK  
    hCallWnd[index]=NULL; g$qh(Z_s  
    HotKey[index]=0; JP]K\nQx'  
    HotKeyMask[index]=0; m[XN,IE#u  
    bRemoved=TRUE; !~#31kL&  
    KeyCount--; q]aRJ`9f  
    break; 6lGL.m'Ra  
   } n >^?BU  
  }  S_atEmQ  
 } ZL Aq8X  
 return bRemoved; 3 ren1   
} U7N<!6  
HD>{UU?  
void VerifyWindow() utXcfKdt  
{ e:]$UAzp  
 for(int i=0;i<MAX_KEY;i++){ ;-F#a+2]!  
  if(hCallWnd!=NULL){ -MZ Eli g  
   if(!IsWindow(hCallWnd)){ pJI H_H  
    hCallWnd=NULL; "#()4.9  
    HotKey=0; ^/,s$dj  
    HotKeyMask=0; Us<lWEX;k  
    KeyCount--; XN Y(@  
   } * HVO  
  } {+ m)*3~w  
 } w;:,W@K  
} h0`) =  
"T'!cy  
BOOL CHookApp::InitInstance() ?{n#j,v!  
{ sC$X7h(Q+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N=kACEo  
 hins=AfxGetInstanceHandle(); ^s-3U  
 InitHotkey(); kF5}S8B  
 return CWinApp::InitInstance(); xiiZ'U  
} p ,!`8c6  
;Mc}If*  
int CHookApp::ExitInstance() wsARH>Vz  
{ T"z!S0I  
 VerifyWindow(); tPUQ"S  
 UnInit(); qy !G&  
 return CWinApp::ExitInstance(); ;J:YNup  
} p81~Lk*Hz@  
JBqzQ^[n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j EX([J1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]Vubz54  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _^B+Xo@E-  
#if _MSC_VER > 1000 ^a]:GPc  
#pragma once nL$tXm-x  
#endif // _MSC_VER > 1000 Au {`o xD  
zAH+{4lC+  
class CCaptureDlg : public CDialog k $);<= ZI  
{ `>V.}K^4  
 // Construction ZE9*i}r  
 public: O;XF'r_  
  BOOL bTray; Og["X0j  
  BOOL bRegistered; uGv+c.~[j  
  BOOL RegisterHotkey(); 1+^c3Dd`  
  UCHAR cKey; %l,Xt"nS#  
  UCHAR cMask; !#r]f9QP  
  void DeleteIcon();  i J\#su  
  void AddIcon(); i-Z@6\/a5  
  UINT nCount; :+YFO.7  
  void SaveBmp(); lfhB2^ ^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ZE :oK   
  // Dialog Data Deam%)bXM]  
  //{{AFX_DATA(CCaptureDlg) b~|B(lL6Xm  
  enum { IDD = IDD_CAPTURE_DIALOG }; {kC]x2 U  
  CComboBox m_Key;  j>6{PDaT  
  BOOL m_bControl; H;^6%HV1  
  BOOL m_bAlt; mr*zl*  
  BOOL m_bShift; \+,jM6l}-  
  CString m_Path; BKIt,7j  
  CString m_Number; n4:WM+f4  
  //}}AFX_DATA 71~V*  
  // ClassWizard generated virtual function overrides wxoBq{r;  
  //{{AFX_VIRTUAL(CCaptureDlg) L3/ua  
 public: j8PK\j[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); k~?@~xm,R  
 protected: @a~K#Bvlm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -Ju!2by  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); bZ389dSn  
  //}}AFX_VIRTUAL 4-TM3Cw`d&  
  // Implementation <"t >!I  
 protected: q3;HfZ  
  HICON m_hIcon; :!R+/5a  
  // Generated message map functions , w_Ew  
  //{{AFX_MSG(CCaptureDlg) ]@'YlPU  
  virtual BOOL OnInitDialog(); $`uL^ hlj]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); dkXK0k  
  afx_msg void OnPaint(); SDot0`s>  
  afx_msg HCURSOR OnQueryDragIcon(); >FY`xl\m}<  
  virtual void OnCancel(); WUHijHo5(8  
  afx_msg void OnAbout(); G6I>Ry[2?  
  afx_msg void OnBrowse(); ^rx]Y;  
  afx_msg void OnChange(); 0iwx$u 7[  
 //}}AFX_MSG s Ce{V*ua  
 DECLARE_MESSAGE_MAP() P'g$F<~V  
}; ua2SW(C@  
#endif N!,@}s  
~*H!zKIx  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D@!#79:)  
#include "stdafx.h" s:Memvf  
#include "Capture.h" ,3x3&c  
#include "CaptureDlg.h" ba ,2.|  
#include <windowsx.h> ]/U)<{6  
#pragma comment(lib,"hook.lib") "*?^'(yA@  
#ifdef _DEBUG EKgTRRW  
#define new DEBUG_NEW Ru2kC} Dx!  
#undef THIS_FILE xFgY#F  
static char THIS_FILE[] = __FILE__; 'sJYt^  
#endif Lg-Sxz}P!  
#define IDM_SHELL WM_USER+1 2jA-y!(e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b^rPw@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zU]95I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6tj +  
class CAboutDlg : public CDialog WOquG  
{ lLl^2[4k5  
 public: !A g W @  
  CAboutDlg(); NKh8'=S  
  // Dialog Data U@DIO/C,m`  
  //{{AFX_DATA(CAboutDlg) H htAD Y  
  enum { IDD = IDD_ABOUTBOX }; %I?uO( @  
  //}}AFX_DATA :H3qa2p  
  // ClassWizard generated virtual function overrides @=:( b"Sg  
  //{{AFX_VIRTUAL(CAboutDlg) V D-,)f  
 protected: [$f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bh<)e5lP:  
  //}}AFX_VIRTUAL fsb_*sh&  
  // Implementation r;SA1n#  
 protected: d'q,:="c  
  //{{AFX_MSG(CAboutDlg) ?bW|~<X~  
  //}}AFX_MSG u 6;SgPw  
  DECLARE_MESSAGE_MAP() 3 l QGU  
}; $fL2w^ @  
"/g/Lc  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) fn]f$n*`  
{ ^GHA,cSf  
 //{{AFX_DATA_INIT(CAboutDlg) F^z&s]^~  
 //}}AFX_DATA_INIT 9F@Q  
} !3E33  
}GRZCX>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Jwgd9a5  
{ 6]1cy&SG  
 CDialog::DoDataExchange(pDX); }HRM6fR1S  
 //{{AFX_DATA_MAP(CAboutDlg) a;8q7nC  
 //}}AFX_DATA_MAP ~{/"fTif  
} r< sx On  
|aIY  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `2( )Vf  
 //{{AFX_MSG_MAP(CAboutDlg) 73 ix4C  
 // No message handlers 09HlL=0q  
 //}}AFX_MSG_MAP AQ7w5}g+V  
END_MESSAGE_MAP() %dw@;IZ#8{  
fIWOo >)D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) AT+7!UGL  
: CDialog(CCaptureDlg::IDD, pParent) 3]$qY_|7  
{ o)GLh^g_I'  
 //{{AFX_DATA_INIT(CCaptureDlg) R,>LUa*u  
  m_bControl = FALSE; R utRA  
  m_bAlt = FALSE; S&^i*R4]  
  m_bShift = FALSE; Xz4T_-X8d  
  m_Path = _T("c:\\"); E>NRC\^@  
  m_Number = _T("0 picture captured."); kLtm_  
  nCount=0; 3\JEp,5  
  bRegistered=FALSE; Q+YYj  
  bTray=FALSE; j]~;|V5Z  
 //}}AFX_DATA_INIT nJC/yS |  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6R1}fdHvP  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1 CXO=Q  
} xy;u"JY*  
$q%r}Cdg  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^}8qPBz  
{ ;n`SF~CU  
 CDialog::DoDataExchange(pDX); Ti:PKpc  
 //{{AFX_DATA_MAP(CCaptureDlg) RzgA;ZC'  
  DDX_Control(pDX, IDC_KEY, m_Key); :|%k*z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %zsY=qT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); @A?Ss8p'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); tX)l_ ?jVH  
  DDX_Text(pDX, IDC_PATH, m_Path); R+}7]tva6C  
  DDX_Text(pDX, IDC_NUMBER, m_Number); N/CL?Z>c  
 //}}AFX_DATA_MAP ny'?Hl'Q  
} J'4Pp<  
\k&2nYVHf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) kn9ul3c  
//{{AFX_MSG_MAP(CCaptureDlg) )jc`_{PQg  
 ON_WM_SYSCOMMAND() ->_rSjnM{  
 ON_WM_PAINT() *ETSx{)8  
 ON_WM_QUERYDRAGICON() ))ArM-02  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]l/ PyX  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^E-BB 6D  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7\.{O$Q  
//}}AFX_MSG_MAP x)GpNkx:  
END_MESSAGE_MAP() xw2dNJL  
CvkZ<i){  
BOOL CCaptureDlg::OnInitDialog() b%A+k"d  
{ 0K T^V R  
 CDialog::OnInitDialog(); (t[sSl  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); - ,YoVB!T  
 ASSERT(IDM_ABOUTBOX < 0xF000); |YEq<wbQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xNAX)v3Z  
 if (pSysMenu != NULL) we?# Dui  
 { ,v\^efc:%  
  CString strAboutMenu; |f67aN  
  strAboutMenu.LoadString(IDS_ABOUTBOX); x#)CH}J  
  if (!strAboutMenu.IsEmpty()) m!#'4  
  { skeH~-`M@  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9fQ[:Hl"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I.dS-)Y  
  } {$AwG#kt  
 } V$o]}|  
 SetIcon(m_hIcon, TRUE); // Set big icon k7ye,_&>  
 SetIcon(m_hIcon, FALSE); // Set small icon 9^+8b9y  
 m_Key.SetCurSel(0); {(#2G,  
 RegisterHotkey(); )wqG^yv  
 CMenu* pMenu=GetSystemMenu(FALSE); "($"T v2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -HQ(t  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hlKM4JT\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @{V bu  
 return TRUE; // return TRUE unless you set the focus to a control $@utlIXA'  
} 6>Dm cG:.  
2UbTKN  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M1HGXdN*B  
{ #EG$HX]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) wa1Qt  
 { ka=EOiX.  
  CAboutDlg dlgAbout; 9@3cz_[J  
  dlgAbout.DoModal(); %r =9,IJ  
 } 'LX]/ D  
 else b%wm-p  
 { x u<oQBt  
  CDialog::OnSysCommand(nID, lParam); \0fS;Q^{j  
 } 15J t @{<r  
} vCX 54  
0]k-0#JM  
void CCaptureDlg::OnPaint() 4"^v]&I  
{ }j`#s  
 if (IsIconic()) _<^mi!Y  
 { ZVIlVuZ}  
  CPaintDC dc(this); // device context for painting nVyV]'-z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); nG4}8  
  // Center icon in client rectangle ,II-:&H  
  int cxIcon = GetSystemMetrics(SM_CXICON); *G&3NSM-  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2H,n"-9+  
  CRect rect; +?9. &<?  
  GetClientRect(&rect); M!4}B  
  int x = (rect.Width() - cxIcon + 1) / 2; qxbGUyH==  
  int y = (rect.Height() - cyIcon + 1) / 2; @V=HY  
  // Draw the icon wN]]t~K)Q  
  dc.DrawIcon(x, y, m_hIcon); h?7@]&VJ  
 } AFdBf6/" i  
 else S; Fj9\2)I  
 { | Kw}S/F  
  CDialog::OnPaint(); Jp 7m$D%  
 } tRYi q  
} ~O8Xj6  
3)*Twqt  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,Pj UlcO_  
{ 6 K-jje;)  
 return (HCURSOR) m_hIcon; (@i2a  
} `xsU'Wd^<  
*pSD[E>SU  
void CCaptureDlg::OnCancel() AQgagE^  
{ z8JdA%YBM  
 if(bTray)  j|owU  
  DeleteIcon(); \O=t5yS  
  CDialog::OnCancel(); }@TtX\7(D  
} >Pwu>  
qr'P0+|~5  
void CCaptureDlg::OnAbout() v=J[p;H^H  
{ eh /QFm 4  
 CAboutDlg dlg; M/evZ?uis  
 dlg.DoModal(); <G60R^o  
} i p; RlO  
-F&*>?I  
void CCaptureDlg::OnBrowse() lG R6S  
{ chszP{-@X  
 CString str; bM>5=Zox  
 BROWSEINFO bi; T:0#se  
 char name[MAX_PATH];  aX}:O  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); T{4Ru6[  
 bi.hwndOwner=GetSafeHwnd(); ay>u``$R  
 bi.pszDisplayName=name; ,}23  
 bi.lpszTitle="Select folder"; XK,l9 {*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;@s'JSPt  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :\69N/uw`  
 if(idl==NULL) rvETt  
  return; ;oivG)hJl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V1 O]L66  
 str.ReleaseBuffer(); U}:e-  
 m_Path=str; Bs;.oK5!n@  
 if(str.GetAt(str.GetLength()-1)!='\\') ~L?q.*q  
  m_Path+="\\"; !9g >/9h  
 UpdateData(FALSE); hM[QR'\QS  
} $;As7MI  
^nN@@ \-5  
void CCaptureDlg::SaveBmp() 56!/E5qgW  
{ 'eg;)e:`b+  
 CDC dc; w ;]~2$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); c=u'#|/eb  
 CBitmap bm; BkJNu_{m?  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0Q5fX}  
 int Height=GetSystemMetrics(SM_CYSCREEN); SwdUElEp  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Av,E|C  
 CDC tdc; UlH;0P?  
 tdc.CreateCompatibleDC(&dc); vI0::ah/  
 CBitmap*pOld=tdc.SelectObject(&bm); o 4cqLM u  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >Ni<itze$i  
 tdc.SelectObject(pOld); g/BlTi  
 BITMAP btm; _28vf Bl?  
 bm.GetBitmap(&btm); >*e,+ok  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -Ou@T#h"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7#9yAS+x(  
 BITMAPINFOHEADER bih; uS&NRf9A  
 bih.biBitCount=btm.bmBitsPixel; ST25RJC  
 bih.biClrImportant=0; 0k 6S`e9gI  
 bih.biClrUsed=0; >?)Df(n(9  
 bih.biCompression=0; @DniYt/  
 bih.biHeight=btm.bmHeight; #9 u2LK  
 bih.biPlanes=1; a6epew!2  
 bih.biSize=sizeof(BITMAPINFOHEADER); , Vr'F  
 bih.biSizeImage=size; 65AG# O5R  
 bih.biWidth=btm.bmWidth; D9-D%R,  
 bih.biXPelsPerMeter=0; D/TEx2.=J3  
 bih.biYPelsPerMeter=0; G;yh$n<"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +/Qgl  
 static int filecount=0; ?0hEd9TU  
 CString name; 9MR,3/&N  
 name.Format("pict%04d.bmp",filecount++); Mhiz{Td  
 name=m_Path+name; ~-zch=+u  
 BITMAPFILEHEADER bfh; V^E.9fs,  
 bfh.bfReserved1=bfh.bfReserved2=0; wC>Xu.Z:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |z]--h  
 bfh.bfSize=54+size; $i.)1.x  
 bfh.bfOffBits=54; jyFXAs2  
 CFile bf; /qObXI  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ qJq2Z.>hy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .vk|aIG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); az;o7[rI^  
  bf.WriteHuge(lpData,size); tp?< e  
  bf.Close(); ;nZN}&m   
  nCount++; 0zrZrl  
 } 2-x#|9  
 GlobalFreePtr(lpData); 0pl |  
 if(nCount==1) sEm064  
  m_Number.Format("%d picture captured.",nCount); ~CQTPR  
 else ^E= w3g&  
  m_Number.Format("%d pictures captured.",nCount); }.74w0~0^  
  UpdateData(FALSE); e{fm7Cc)D  
} \A=:6R%Qb  
' Y cVFi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $*z>t*{7  
{ #t?tt,nc}  
 if(pMsg -> message == WM_KEYDOWN) -$+`v<[r  
 { Avr2MaY{h  
  if(pMsg -> wParam == VK_ESCAPE) ZINqIfc  
   return TRUE; L0dj 76'M  
  if(pMsg -> wParam == VK_RETURN) iR6w)  
   return TRUE; `2.2; Vk  
 } oRQJ YH  
 return CDialog::PreTranslateMessage(pMsg);  b@m\ca  
} -3T~+  
Sz#dld Mz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U6 $)e.FO  
{ U3 y-cgE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i! DO  
  SaveBmp(); \aB>Q"pS  
  return FALSE; +ht{ARX2(  
} v5`Q7ZZ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m[%*O#_  
 CMenu pop; rA6lyzJ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A0`#n|(Ad!  
 CMenu*pMenu=pop.GetSubMenu(0); Fg<rz&MR  
 pMenu->SetDefaultItem(ID_EXITICON); UqEpeLK  
 CPoint pt; :qL1jnR^  
 GetCursorPos(&pt); _pe_w{V-b6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +*vg) F:  
 if(id==ID_EXITICON) E|>oseR  
  DeleteIcon(); NvU~?WN  
 else if(id==ID_EXIT) +=&A1{kR3  
  OnCancel(); WPu{ ]<pl  
 return FALSE; eh5j  
} N]iu o.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); j@4AY}[tX  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >4@/x{{  
 AddIcon(); L6E8A?>5rD  
 return res; dzn[4  
} -`<KjS  
Uth H  
void CCaptureDlg::AddIcon() 'I8K1Q=/  
{ f!n0kXVu6U  
 NOTIFYICONDATA data; '&n4W7  
 data.cbSize=sizeof(NOTIFYICONDATA); 5}" @$.{i  
 CString tip;  Q  
 tip.LoadString(IDS_ICONTIP); 5y%-K=d  
 data.hIcon=GetIcon(0); i>}aQ:&^0  
 data.hWnd=GetSafeHwnd(); 8,m3]Lg  
 strcpy(data.szTip,tip); %}0B7_6B+@  
 data.uCallbackMessage=IDM_SHELL; -T+7u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qTD^Vz V  
 data.uID=98; ]31UA>/TI  
 Shell_NotifyIcon(NIM_ADD,&data); Ccx1#^`  
 ShowWindow(SW_HIDE); ?N/6m  
 bTray=TRUE; eg$y,Tx  
} `7mRUDz  
k}h\RCy%f  
void CCaptureDlg::DeleteIcon() g&oAa;~o  
{ |NoTwK  
 NOTIFYICONDATA data; ? j8S.d~  
 data.cbSize=sizeof(NOTIFYICONDATA); MzudCMF  
 data.hWnd=GetSafeHwnd(); *sbZ{{]e  
 data.uID=98; ;%_s4  
 Shell_NotifyIcon(NIM_DELETE,&data); F:B 8J4/  
 ShowWindow(SW_SHOW); P/hV{@x  
 SetForegroundWindow(); -=)Al^V4T  
 ShowWindow(SW_SHOWNORMAL); qPI1\!z6  
 bTray=FALSE; h.ln%6:d  
} U81--'@y  
4Cn% h)w  
void CCaptureDlg::OnChange() MR{JMo=r  
{ GZ@`}7b}  
 RegisterHotkey(); ;ZVT[gi*  
} 'gQ0=6(\  
K6s%=.Zi(  
BOOL CCaptureDlg::RegisterHotkey() b!J%s   
{ Sl7x>=  
 UpdateData(); ZgD%*bH*B  
 UCHAR mask=0; swGp{wJ  
 UCHAR key=0; ~?#B(t  
 if(m_bControl) +91j 1?  
  mask|=4; VvSe`E*  
 if(m_bAlt) N(W;\>P  
  mask|=2; `HO_t ek  
 if(m_bShift) <g4[p^A  
  mask|=1; _>k&M7OU4  
  key=Key_Table[m_Key.GetCurSel()]; ?0%3~E`l:  
 if(bRegistered){ 1O{(9nNj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8uZM%7kI6+  
  bRegistered=FALSE; 2uln)]  
 } 4,)EG1  
 cMask=mask; O7of9F~"  
 cKey=key; {#o0vWS>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p6Ie?Gg  
 return bRegistered; -)Zp"  
} v+b#8  
XHER[8l  
  四、小结 c1x{$  
"xK#%eJjWd  
  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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