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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: j%qBNoT~  
  GDW$R`2  
  一、实现方法 Lh(` 9(tX  
1/H9(2{L  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: XPt<k&o1,  
Do&/+Ssnu  
#pragma data_seg("shareddata") PnKgUJoa0  
HHOOK hHook =NULL; //钩子句柄 _26<}&]b*  
UINT nHookCount =0; //挂接的程序数目 =R  <X!@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fv",4L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 c= }#8d.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey LZB=vc|3/  
static int KeyCount =0; ]E hW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 I,@f*o  
#pragma data_seg() 18AKM  
d}.*hgk  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 jxU z-U-  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: A#y,B  
;L gxL Qy;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [Ie;Jd>gG  
cKey,UCHAR cMask) J}9 I5O  
{ DhAQ|SdCf  
 BOOL bAdded=FALSE; A80r@)i  
 for(int index=0;index<MAX_KEY;index++){ tX$ v)O|  
  if(hCallWnd[index]==0){ #0WGSIht<  
   hCallWnd[index]=hWnd; Jmp%%^  
   HotKey[index]=cKey; /*+P}__k  
   HotKeyMask[index]=cMask; {Di()]/  
   bAdded=TRUE; Whd2mKwiO  
   KeyCount++; H7 xyK  
   break; uq>\pO&P  
  } /8(\AuDT  
 } [a<u cJ  
 return bAdded; &C.{7ZNt  
} )r)3.|wJm  
//删除热键 H 40~i=.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7( &\)qf=n  
{ 5VU 5kiCt  
 BOOL bRemoved=FALSE; E8Jy!8/X9T  
 for(int index=0;index<MAX_KEY;index++){ \C )S3!h  
  if(hCallWnd[index]==hWnd){ ?4kM5NtP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t@`w}o[#  
    hCallWnd[index]=NULL; ky`xBO =  
    HotKey[index]=0; DaV:Slp9  
    HotKeyMask[index]=0; \D9J!K82  
    bRemoved=TRUE; oM&}akPE  
    KeyCount--; B J0P1vh6M  
    break; !5hNG('f  
   } \Tc<27-  
  } R<J1bH1n3  
 } _7h:NLd  
 return bRemoved; g8JO/s5xV  
} 7Z#r9Vr  
3q!hY  
ID-Y*  
  DLL中的钩子函数如下: J\kGD  
zJH#J=O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B~[QmK  
{ k_E Jg;(  
 BOOL bProcessed=FALSE; pQGlg[i2/  
 if(HC_ACTION==nCode) A{HP*x~t  
 { xH\#:DLY  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 `Dck$  
   switch(wParam) fL #e4  
   {  R|jt mI?  
    case VK_MENU: 'UYxVh9D  
     MaskBits&=~ALTBIT; %yj z@  
     break; 5 (Lw-_y#  
    case VK_CONTROL: _</>`P[  
     MaskBits&=~CTRLBIT; *kmD/J  
     break; m~[4eH,  
    case VK_SHIFT: i;u#<y{E  
     MaskBits&=~SHIFTBIT; M x/G^yO9  
     break; :7,j%ELic  
    default: //judge the key and send message rjFIK`_w  
     break; S~~G0GiW  
   } ,G q?  
   for(int index=0;index<MAX_KEY;index++){ e5g# a}  
    if(hCallWnd[index]==NULL) EpX.{B@B_[  
     continue; ju jhK'\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4=G)j+RCH  
    { $ ]ew<j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y@#JzfY?Hr  
     bProcessed=TRUE; %j.B/U$  
    } ^V1.Y  
   } \iBEyr]  
  } K@JGGgrE`!  
  else if((lParam&0xc000ffff)==1){ //有键按下 B_gzpS]  
   switch(wParam) kqebU!0-  
   { ~o_zV'^f@o  
    case VK_MENU: ?5N7,|K)  
     MaskBits|=ALTBIT; Hwz.5hV"  
     break; [tKH'}/s=  
    case VK_CONTROL: q X"Pg  
     MaskBits|=CTRLBIT; :>:F6Db"U  
     break; FZt a  
    case VK_SHIFT: d@$]/=%  
     MaskBits|=SHIFTBIT; N;YAG#'9~_  
     break; eK=W'cNu  
    default: //judge the key and send message Y#VtZTcT  
     break; 9J*M~gKbz  
   } $s2Y,0>I6  
   for(int index=0;index<MAX_KEY;index++){ UA BaS(f3  
    if(hCallWnd[index]==NULL) 0eGz|J*7  
     continue; wM-I*<L>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5~,/VV  
    { DOsQVdH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?~%Go  
     bProcessed=TRUE; agbG)t0  
    } 0^0Q0A  
   } U#qs^f7R  
  } TrYt(F{t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (bX77 Xr  
   for(int index=0;index<MAX_KEY;index++){ ]O^C'GzZ  
    if(hCallWnd[index]==NULL) 6m~N2^z  
     continue; 4N!Eqw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e5}KzFZmZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G1=/G  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 u l-A'  
   } |7pi9  
  } hxB` hu-  
 } `kRv+Qwfa  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z\\'0yuY(  
} ^Fn~@'  
{o."T/?d'  
  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: _^k9!V jo  
I+!?~]AUuq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @VzD> ?)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~S85+OJ;M  
,\DSi&T  
  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: !,(6uO%  
nNEIwlj;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J7RO*.O&Iq  
{ 'm4v)w<y#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JZUf-0q  
 { !4/s|b9K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f\|R<3 L  
  SaveBmp(); fF|m~#y  
  return FALSE; f4 [Bj{F  
 } !W4X4@  
 …… //其它处理及默认处理 dsUt[z1w5  
} q-3e^-S*  
,ix>e  
,&q Q[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。 "!AbH<M;@  
%3@a|#g  
  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。  |Ok=aV7  
zm&?G  
  二、编程步骤 mdB~~j  
8HaBil  
  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"; YQ`m;<  
K:JM*4W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A7hWAq  
zz7#g U  
  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; ssx #\  
0sR+@\  
  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; pR,eus;8  
D-S"?aO-  
  5、 添加代码,编译运行程序。 79bt%P  
!8Mi+ZV  
三、程序代码 8%,u~ELA  
u&npUw^Va  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,K-?M5(n9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "%?$BoJR0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S_|VlI  
#if _MSC_VER > 1000 { ML)F]]  
#pragma once }u `~lw(Z  
#endif // _MSC_VER > 1000 fJdTVs@  
#ifndef __AFXWIN_H__ ^h5h kIx0  
#error include 'stdafx.h' before including this file for PCH X%lk] &2  
#endif HC$rC"f  
#include "resource.h" // main symbols -Z<V? SFOK  
class CHookApp : public CWinApp q qFN4AO  
{ Q$B\)9`v[  
 public: *@-a{T}  
  CHookApp(); AnD#k ]  
  // Overrides VS\+"TPuH  
  // ClassWizard generated virtual function overrides l.Yq4qW  
  //{{AFX_VIRTUAL(CHookApp) <W2 YG6^i  
 public: dJf#j?\[  
  virtual BOOL InitInstance(); OV+|j  
  virtual int ExitInstance(); @@QB,VS;{<  
  //}}AFX_VIRTUAL ol#4AU`  
  //{{AFX_MSG(CHookApp) zir?13N7  
  // NOTE - the ClassWizard will add and remove member functions here. "P9SW?',  
  // DO NOT EDIT what you see in these blocks of generated code ! W02t6DW  
  //}}AFX_MSG 0%b !ARix  
  DECLARE_MESSAGE_MAP() [Q:C\f]  
}; ySP%i6!au  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w dpd`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZR |n\.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f8 vWN  
BOOL InitHotkey(); c_Fz?R+f?K  
BOOL UnInit(); 1(4}rB3  
#endif :vWixgLg  
1m\ihU  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. p8bAz  
#include "stdafx.h" |3K]>Lio  
#include "hook.h" y=k!>Y|E  
#include <windowsx.h> ig}H7U2q@  
#ifdef _DEBUG yq]/r=e!k  
#define new DEBUG_NEW TMAart; <  
#undef THIS_FILE 3zsjL=ta  
static char THIS_FILE[] = __FILE__; 032PR;]  
#endif K[s!3.u  
#define MAX_KEY 100 _uQxrB"9  
#define CTRLBIT 0x04 qQ^ bUpk0  
#define ALTBIT 0x02 tFrNnbmlQ  
#define SHIFTBIT 0x01 \O G`+"|L  
#pragma data_seg("shareddata") *{1]b_<  
HHOOK hHook =NULL; CWx_9b zk  
UINT nHookCount =0; 0m>?-/uDx  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1_MaaA;ow"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ps&p|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FXO{i:Zo  
static int KeyCount =0; kgGMA 7Jy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift wNtPh&  
#pragma data_seg() "}ZUa~7  
HINSTANCE hins; &l;wb.%ijW  
void VerifyWindow(); _2p D  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 'M=c-{f~  
//{{AFX_MSG_MAP(CHookApp) skzTw66W.  
// NOTE - the ClassWizard will add and remove mapping macros here. mJFFst,  
// DO NOT EDIT what you see in these blocks of generated code! 1_RN*M +#  
//}}AFX_MSG_MAP J,,+JoD  
END_MESSAGE_MAP() D]B;5f  
yTpvKCC  
CHookApp::CHookApp() <52)  
{ %5-   
 // TODO: add construction code here, A"pV 7 y  
 // Place all significant initialization in InitInstance LPK[^  
} @mRda %qR  
v#ERXIrf  
CHookApp theApp; [D= KI&@&O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GGF;4  
{ "Wz74ble  
 BOOL bProcessed=FALSE; i8 fUzg)  
 if(HC_ACTION==nCode) +~l`rJ  
 { wpS $ -  
  if((lParam&0xc0000000)==0xc0000000){// Key up MgG_D6tDM  
   switch(wParam) &8'QD~  
   { aX,ux9#  
    case VK_MENU: ^,,lo<d_L  
     MaskBits&=~ALTBIT; C#@>osC  
     break; P%_PG%O2p  
    case VK_CONTROL: yaWHGre  
     MaskBits&=~CTRLBIT; e,I{+ ^P  
     break; >X0c:p Pu  
    case VK_SHIFT: j`LvS  
     MaskBits&=~SHIFTBIT; }v$T1Cw  
     break; C=!YcJ9  
    default: //judge the key and send message |p"4cG?)  
     break; n.tJ-l5[  
   } O9jpt>:kZ  
   for(int index=0;index<MAX_KEY;index++){ o:nh3K/YJ  
    if(hCallWnd[index]==NULL) b]XDfe  
     continue; +8eW/Bs@2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l.AG^b  
    { u8sK~1CPf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3oE3bBj  
     bProcessed=TRUE; "u.4@^+i  
    } n&;-rj^qq  
   } 01AzM)U3"m  
  } DY'1#$;  
  else if((lParam&0xc000ffff)==1){ //Key down ptvM>zw'~g  
   switch(wParam) BzyzOtBp3L  
   { VSQxlAGk@  
    case VK_MENU: /'WVRa  
     MaskBits|=ALTBIT; &XH{,fv$  
     break; x39n7+j4  
    case VK_CONTROL: ;VI W/  
     MaskBits|=CTRLBIT; ^Z~'>J  
     break; FEq R7  
    case VK_SHIFT: p&<X&D   
     MaskBits|=SHIFTBIT; v.pj PBU1  
     break; 9G)q U  
    default: //judge the key and send message `|d&ta[{  
     break; ?> SH`\  
   } .X(*mmH  
   for(int index=0;index<MAX_KEY;index++) Ii4lwZnz  
   { nd?R|._R  
    if(hCallWnd[index]==NULL) +'fdAc:5',  
     continue; 3G9AS#-C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gt= _;KZ  
    { 0"O22<K3a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A"` (^#a  
     bProcessed=TRUE; .f~x*@  
    } ' *x?8-KP  
   } FMBzTD  
  } AroXf#.  
  if(!bProcessed){ xs ^$fn\  
   for(int index=0;index<MAX_KEY;index++){ <+2M,fq+  
    if(hCallWnd[index]==NULL) "Ca?liy  
     continue; 2 - ?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *q/oS8vavd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v\gCgx=%j  
   } -+#g.1UL/  
  } 7<?~A6  
 } Z-BPC|e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;q6FdS  
} |Y42ZOK0  
#H1ng<QV  
BOOL InitHotkey() v4V|j<R  
{ 8LouCv(>  
 if(hHook!=NULL){ 5 LZ+~!2+  
  nHookCount++; oztfr<cUH  
  return TRUE; std4Nyp  
 } |K%nVcR=  
 else WF{rrU:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h r!Htew4  
  if(hHook!=NULL) _'lrI23I  
   nHookCount++; Tfba3+V  
  return (hHook!=NULL); _a3,Zuv  
} ;2=H7dq  
BOOL UnInit() _Xn[G>1  
{ d;kdw  
 if(nHookCount>1){ E?/Bf@a28=  
  nHookCount--; E'J| p7  
  return TRUE; I 8 \Ka=w  
 } jLEwFPz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Zg@NMT  
 if(unhooked==TRUE){ utz!ElzA  
  nHookCount=0; TLk=H Gw  
  hHook=NULL; L*VO2YI  
 } B3V=;zn3  
 return unhooked; tE: m& ;I  
} f9Hm2wV  
@pKQ}?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XNU[\I  
{ O)tZ`X;  
 BOOL bAdded=FALSE; >/DyR+?>4  
 for(int index=0;index<MAX_KEY;index++){ 2@ <x%T  
  if(hCallWnd[index]==0){ 8R6!SB  
   hCallWnd[index]=hWnd; JRC+>'}Xj  
   HotKey[index]=cKey; -H%806NAX7  
   HotKeyMask[index]=cMask; u K`T1*_  
   bAdded=TRUE; p6yC1\U!o  
   KeyCount++; hl[!4#b]K  
   break; ci@U a}T  
  } m-Uq6_e  
 } 4oF8F)ASj  
 return bAdded; 3PEv.hGx  
} ZMHb  
:(|;J<R%_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ba\l`$%X  
{ JRm:hf'  
 BOOL bRemoved=FALSE; s9wc ZO  
 for(int index=0;index<MAX_KEY;index++){ @Ee'nP   
  if(hCallWnd[index]==hWnd){ hoc$aqP6pp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <Cvlz^K[  
    hCallWnd[index]=NULL; H-9%/e  
    HotKey[index]=0; I]]3=?Y  
    HotKeyMask[index]=0; tBp146`  
    bRemoved=TRUE; GB(o)I#h  
    KeyCount--; Ua^'KRSO  
    break; "(hhb>V1Wl  
   } R^.oM1qu|  
  } =-`}(b2N  
 } *:q3<\y{  
 return bRemoved; 7J]tc1-re  
} Yd4J:  
_M/ckv1q@  
void VerifyWindow() D-/K'|b  
{ `o 6Hm  
 for(int i=0;i<MAX_KEY;i++){ ag-\(i;K]  
  if(hCallWnd!=NULL){ m"~^-mJ-  
   if(!IsWindow(hCallWnd)){ 9ZL3p!  
    hCallWnd=NULL; @LS*WJ< w-  
    HotKey=0; 8"4&IX  
    HotKeyMask=0; lEBt<  
    KeyCount--; ,OX(z=i_  
   } d7y`AS@q6  
  } ?q(7avS9  
 } :!M/9D*}0  
} t%e}'?#^  
2<Tbd"x?  
BOOL CHookApp::InitInstance() coHzbD~#H  
{ )v-sde\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +-=w`  
 hins=AfxGetInstanceHandle(); I_('Mr)  
 InitHotkey(); 1f]04TI  
 return CWinApp::InitInstance(); x1\,WOrmK  
} $!L'ZO1_r  
M1^?_;B  
int CHookApp::ExitInstance() 92F (Sl  
{ WHQg6r  
 VerifyWindow(); + RX{  
 UnInit(); TKpka]nJ  
 return CWinApp::ExitInstance(); njveZav  
} F$UvYy4O d  
,YYyFMC7S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file XO+^q9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) l+'@y (}Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K14e"w%6rs  
#if _MSC_VER > 1000 .(OFYK<  
#pragma once Gpws_ jw  
#endif // _MSC_VER > 1000 QCFLi n+r  
 `Nn=6[]  
class CCaptureDlg : public CDialog Z5re Fok  
{ NDW6UFd>1  
 // Construction #Jv|zf5Z  
 public: 6fhH)]0  
  BOOL bTray; 0Zp) DM  
  BOOL bRegistered; Y]aVa2!Wb  
  BOOL RegisterHotkey(); MzRws f  
  UCHAR cKey; 7t7"glP  
  UCHAR cMask; Vv4 w?K  
  void DeleteIcon(); k/A8 |  
  void AddIcon(); 4k5X'&Q  
  UINT nCount; a9C8Q l  
  void SaveBmp(); Ah,X?0+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GsG.9nd  
  // Dialog Data !rzbm&@  
  //{{AFX_DATA(CCaptureDlg) 79|=y7i#  
  enum { IDD = IDD_CAPTURE_DIALOG }; :c@v_J6C&  
  CComboBox m_Key; 5F{NPKa Q  
  BOOL m_bControl; TU4"7]/{M  
  BOOL m_bAlt; >NWrT^rk  
  BOOL m_bShift; yrOWC  
  CString m_Path; ?!=yp#  
  CString m_Number; :DTKZ9>2D  
  //}}AFX_DATA 095:"GvO  
  // ClassWizard generated virtual function overrides _FXvJ}~m  
  //{{AFX_VIRTUAL(CCaptureDlg) f]MKNX  
 public: )?#*GMWU  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /EF0~iy  
 protected: SFVOof#s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~Rd,jfx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3 f=_F  
  //}}AFX_VIRTUAL u}ULb F  
  // Implementation BbEWa  
 protected: "c8 -xG  
  HICON m_hIcon; T 22tZp  
  // Generated message map functions FES_:?.0  
  //{{AFX_MSG(CCaptureDlg) v#1}( hb  
  virtual BOOL OnInitDialog(); m~c z  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5+*MqO>  
  afx_msg void OnPaint(); o$]wd*+  
  afx_msg HCURSOR OnQueryDragIcon(); (_h<<`@B  
  virtual void OnCancel(); C7#ji"t  
  afx_msg void OnAbout(); )[&'\SOO  
  afx_msg void OnBrowse(); ocCq$%Ka  
  afx_msg void OnChange(); qPeaSv]W  
 //}}AFX_MSG fYrC;&n  
 DECLARE_MESSAGE_MAP() @X@?jj&  
}; Y ;$wD9W  
#endif .{[+d3+,  
$VOSd<87  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HriY-=ji>a  
#include "stdafx.h" :.wR*E  
#include "Capture.h" .J0s_[  
#include "CaptureDlg.h" bBwQ1,c$  
#include <windowsx.h> s8L=:hiSf)  
#pragma comment(lib,"hook.lib") 32nB9[l  
#ifdef _DEBUG <d89eV+  
#define new DEBUG_NEW ~9%L)nC2'  
#undef THIS_FILE _m.u@+g  
static char THIS_FILE[] = __FILE__; DX>Yf}  
#endif 4D+S\S0bk  
#define IDM_SHELL WM_USER+1 d:C|laZHn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {nvF>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kr ,&aP<,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =-wF Brw  
class CAboutDlg : public CDialog m)"gj**|y  
{ >&pB&'A a  
 public: }8 V/Cd9  
  CAboutDlg(); SU>2MT^  
  // Dialog Data /4Ud6gscf  
  //{{AFX_DATA(CAboutDlg) 1dDK(RBbQ  
  enum { IDD = IDD_ABOUTBOX }; AA=zDB<N  
  //}}AFX_DATA !1G6ZC:z  
  // ClassWizard generated virtual function overrides L@9@3?  
  //{{AFX_VIRTUAL(CAboutDlg) @JB9qT  
 protected: HRQ3v`P.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yW3!V-iA  
  //}}AFX_VIRTUAL Ruy qB>[o  
  // Implementation 'W'['TV  
 protected: 9)P-<  
  //{{AFX_MSG(CAboutDlg) :wWPEhK  
  //}}AFX_MSG u={A4A#  
  DECLARE_MESSAGE_MAP() \! `k:lusa  
}; @8\7H'K"\  
X#v6v)c  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v_U+wga  
{ i2bkgyzB.  
 //{{AFX_DATA_INIT(CAboutDlg) Xy(8}  
 //}}AFX_DATA_INIT `Hlv*" w$  
} ZC7ZlL _  
$2!|e,x  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;t6)(d4z?  
{ }EJAC*W,  
 CDialog::DoDataExchange(pDX); s=KK)6T  
 //{{AFX_DATA_MAP(CAboutDlg) O4`am:@  
 //}}AFX_DATA_MAP b}&2j3-n,  
} UdGa#rcNW  
0eJqDCmH  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "~V|p3  
 //{{AFX_MSG_MAP(CAboutDlg) ||p>O  
 // No message handlers ''p7!V?  
 //}}AFX_MSG_MAP Gl am(V1  
END_MESSAGE_MAP() MBp,! _Q6  
~F)[H'$A  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) { Q?\%4>2  
: CDialog(CCaptureDlg::IDD, pParent) O@9<7@h+Nl  
{ oItEGJ|  
 //{{AFX_DATA_INIT(CCaptureDlg) <GdQ""X  
  m_bControl = FALSE; 4hl`~&yDf  
  m_bAlt = FALSE; z4!Y9  
  m_bShift = FALSE; FaA'%P@  
  m_Path = _T("c:\\"); n]nb+_-97  
  m_Number = _T("0 picture captured."); Z'Uc}M'U  
  nCount=0; %"yy8~|  
  bRegistered=FALSE; i!yu%>:M  
  bTray=FALSE; VbU*&{j  
 //}}AFX_DATA_INIT Nbyc,a[o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 xZ=6  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0,{tBo  
} [B_(,/?  
&$H7vdWNy  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RyuI2jEy  
{ NzBX2  
 CDialog::DoDataExchange(pDX); I_.Jo `lK~  
 //{{AFX_DATA_MAP(CCaptureDlg) qI= j>x  
  DDX_Control(pDX, IDC_KEY, m_Key); w^EUBRI-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ]=ubl!0=:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b^s>yN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); tNbL)  
  DDX_Text(pDX, IDC_PATH, m_Path); A_pcv7=@  
  DDX_Text(pDX, IDC_NUMBER, m_Number); sKCfI]  
 //}}AFX_DATA_MAP ;NoD4*  
} fkHCfcU  
ov xX.h O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) sjW;Nsp  
//{{AFX_MSG_MAP(CCaptureDlg) sUe<21:  
 ON_WM_SYSCOMMAND() ]r&dWF  
 ON_WM_PAINT() paYvYK-K?  
 ON_WM_QUERYDRAGICON() WHkrd8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wJ>.I<F6B  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^J-"8%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PSB@yV <  
//}}AFX_MSG_MAP =@\Li)Y  
END_MESSAGE_MAP() nqv#?>Z^OT  
h 0c&}kM  
BOOL CCaptureDlg::OnInitDialog() fU^6h`t  
{ `mp3ORR;$  
 CDialog::OnInitDialog(); Y I?4e7Z+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0}4FwcCr\  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8GKqPS+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =5 kTzH.  
 if (pSysMenu != NULL) UmNh0nS  
 { lm[LDtc  
  CString strAboutMenu; vVfIe5+OP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -. J@  
  if (!strAboutMenu.IsEmpty()) 2;`F` }BA  
  { \L]T|]}(  
   pSysMenu->AppendMenu(MF_SEPARATOR); y%Wbm&h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +cf.In,{  
  } <8sy*A?0z  
 } Su>UXuNdE#  
 SetIcon(m_hIcon, TRUE); // Set big icon O_^X:0}  
 SetIcon(m_hIcon, FALSE); // Set small icon " ra C?H  
 m_Key.SetCurSel(0); au?5^u\  
 RegisterHotkey(); U/j+\Kc~  
 CMenu* pMenu=GetSystemMenu(FALSE); dk@j!-q^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .!2Ac  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ];U}'&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JQO%-=t  
 return TRUE; // return TRUE unless you set the focus to a control ) mG  
} -Izc-W  
Xhk_h2F[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nNP{>\x;"  
{ k<.VR"I p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @'lO~i  
 { no UXRQ  
  CAboutDlg dlgAbout; R1j)0b6cQ%  
  dlgAbout.DoModal(); R2B0?fu  
 } ptCAtEO72  
 else ;Y@"!\t}  
 { wPRs.(]_  
  CDialog::OnSysCommand(nID, lParam); Zt{\<5j  
 } )an,-EIX%  
} V+dFL9  
g| M@/D l  
void CCaptureDlg::OnPaint() ^hIKDc!.m  
{ 4SGF8y@WU  
 if (IsIconic()) t=6Wk4  
 { lKA2~o  
  CPaintDC dc(this); // device context for painting $@}\T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZnXq+^ Z4  
  // Center icon in client rectangle jPyhn8Vw  
  int cxIcon = GetSystemMetrics(SM_CXICON); #h~v(Z}  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'X]m y  
  CRect rect; 2I qvd  
  GetClientRect(&rect); %>)&QZig/  
  int x = (rect.Width() - cxIcon + 1) / 2; $ 8WJ$73  
  int y = (rect.Height() - cyIcon + 1) / 2; f^D4aEU  
  // Draw the icon C+<z ;9`  
  dc.DrawIcon(x, y, m_hIcon); 63Dm{ 2i}F  
 } N^U<;O?YDW  
 else $P7G,0-  
 { H>Ws)aCq  
  CDialog::OnPaint(); lk. ;  
 } }rbsarG@  
} 1Yb9ILX[J  
BdYl sYp  
HCURSOR CCaptureDlg::OnQueryDragIcon() > qDHb'  
{ "YQ%j+  
 return (HCURSOR) m_hIcon; eK_Yt~dj  
} p}{V%!`_  
!tr /$  
void CCaptureDlg::OnCancel() -mPrmapb3  
{ /`YbHYNF[  
 if(bTray) 8C4 =f  
  DeleteIcon(); O,A}p:Pgs  
  CDialog::OnCancel(); l0g`;BI_  
} Da WzQe=  
Q{))+'s2h  
void CCaptureDlg::OnAbout() 'h~I#S4!  
{ EHC^ [5  
 CAboutDlg dlg; j6.'7f5M<H  
 dlg.DoModal(); nbM7 >tnsk  
} .}||!  
RI2Or9.  
void CCaptureDlg::OnBrowse() x|oa"l^JZ"  
{ 2`]_c=  
 CString str; Qx%]u8s  
 BROWSEINFO bi; z,#3YC{'  
 char name[MAX_PATH]; Me|+)}'p5h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); twA2U7F  
 bi.hwndOwner=GetSafeHwnd(); xgQ]#{ tG  
 bi.pszDisplayName=name; |Sf` Cs  
 bi.lpszTitle="Select folder"; ^FZ7)T  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t1h2ibO  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); TPeBb8v 8D  
 if(idl==NULL) {cF >, T  
  return; `9yR,Xk=l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \ mt> R[  
 str.ReleaseBuffer(); dS[="Set  
 m_Path=str; xw%'R-  
 if(str.GetAt(str.GetLength()-1)!='\\')  GP/G v  
  m_Path+="\\"; Hxm CKW!  
 UpdateData(FALSE); R.+yVO2  
} {<_9QAS  
iTq~ ^9G  
void CCaptureDlg::SaveBmp() hm5A@Z   
{ )xMP  
 CDC dc; 8;r7ksE~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b2vc  
 CBitmap bm; {=Ku9\  
 int Width=GetSystemMetrics(SM_CXSCREEN); v8L&F9 o  
 int Height=GetSystemMetrics(SM_CYSCREEN); +v}R-gNR  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (KDv>@5  
 CDC tdc; w'b|*_Q4Q  
 tdc.CreateCompatibleDC(&dc); xp>p#c  
 CBitmap*pOld=tdc.SelectObject(&bm); |UO&18Y7-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9ywPWT[^  
 tdc.SelectObject(pOld); V,@Y,  
 BITMAP btm; ?8LRd5LH  
 bm.GetBitmap(&btm); /rqaUC)A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BkTGH.4G%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fP9k(mQX  
 BITMAPINFOHEADER bih; fDa$TbhjI  
 bih.biBitCount=btm.bmBitsPixel; .C2.j[>  
 bih.biClrImportant=0; \I4*|6kA  
 bih.biClrUsed=0; ;_^ "}  
 bih.biCompression=0; (n~ e2tZ/  
 bih.biHeight=btm.bmHeight; 7 i |_PP_  
 bih.biPlanes=1; ;7]Q'N  
 bih.biSize=sizeof(BITMAPINFOHEADER); u/h!i@_w[  
 bih.biSizeImage=size; jKcnZu  
 bih.biWidth=btm.bmWidth; 2Rp'ju~O)/  
 bih.biXPelsPerMeter=0; 5_mb+A n,  
 bih.biYPelsPerMeter=0; 1Jx|0YmO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Kb#}f/  
 static int filecount=0; 3GSoHsNk  
 CString name; Ye8&cZ*.  
 name.Format("pict%04d.bmp",filecount++); vkXdKL(q  
 name=m_Path+name; Va1 eG]jQ  
 BITMAPFILEHEADER bfh; L/.$0@$bv  
 bfh.bfReserved1=bfh.bfReserved2=0; mmVx',k  
 bfh.bfType=((WORD)('M'<< 8)|'B'); z <"7vR  
 bfh.bfSize=54+size; h4GR:`  
 bfh.bfOffBits=54; 2Q,8@2w;  
 CFile bf; n+EK}= DK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?CQ\9 4kO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E!4Qc+.   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q1Jkt  
  bf.WriteHuge(lpData,size); :q2tda  
  bf.Close(); cJ%u&2J_  
  nCount++; gJy Ft8Z<  
 } QPH2TXw  
 GlobalFreePtr(lpData); M-2:$;D  
 if(nCount==1) "$Wi SR  
  m_Number.Format("%d picture captured.",nCount); <9S?wju4W'  
 else *yv@-lP5s  
  m_Number.Format("%d pictures captured.",nCount); ]x hmM1$  
  UpdateData(FALSE); 2wWL]`(E  
} z:aT5D  
s68EzFS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .~4>5W"u  
{ `O5kI#m)L*  
 if(pMsg -> message == WM_KEYDOWN) TXi$Q%0W  
 { d8b'Gjwtw  
  if(pMsg -> wParam == VK_ESCAPE) R0y@#}JH  
   return TRUE; 0 mWfR8h0  
  if(pMsg -> wParam == VK_RETURN) ><X!~by  
   return TRUE; TA}z3!-y*  
 } Qhnz7/a9  
 return CDialog::PreTranslateMessage(pMsg); >8 V;:(nt  
} bl>MD8bzLE  
Qr;es,f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "Yn <]Pa_  
{ ?wps_XU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %<e\s6|P:  
  SaveBmp(); HRx%m1H  
  return FALSE; BEM+FG  
} 'nNw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ : 5@cj j  
 CMenu pop; XHO}(!l\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XbJ=lH  
 CMenu*pMenu=pop.GetSubMenu(0); eBTy!!  
 pMenu->SetDefaultItem(ID_EXITICON); ^c1I'9(r5  
 CPoint pt; #ZIV>(Q\H  
 GetCursorPos(&pt); N1Y*IkW"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VwoCR q*  
 if(id==ID_EXITICON) (~TP  
  DeleteIcon(); lX`)Avqa  
 else if(id==ID_EXIT) :y'D] ,_  
  OnCancel(); {Gs&u>>R"^  
 return FALSE; 4yC{BRbi  
} VG'oy  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /D_8uTS>d[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #UC4l]Ru A  
 AddIcon(); HPAg1bV:-  
 return res; -9{}rE  
} y^zVb\"4  
Vzz0)`*hQ  
void CCaptureDlg::AddIcon() p]:~z|.Ba  
{ g~%=[1  
 NOTIFYICONDATA data; O'm&S?>  
 data.cbSize=sizeof(NOTIFYICONDATA); @]d N   
 CString tip; 3Fh<%<=  
 tip.LoadString(IDS_ICONTIP); 5.xvOi|.  
 data.hIcon=GetIcon(0); `4Z#/g  
 data.hWnd=GetSafeHwnd(); 8&VwAo  
 strcpy(data.szTip,tip); L.15EXAB  
 data.uCallbackMessage=IDM_SHELL; %|Vo Zx ^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eF"7[_+D  
 data.uID=98; 1,W%t\D  
 Shell_NotifyIcon(NIM_ADD,&data); E8>npDFv.  
 ShowWindow(SW_HIDE); 3l>P>[<o  
 bTray=TRUE; IqEY.2KN  
} Tm_vo-   
f9D7T|J?10  
void CCaptureDlg::DeleteIcon() \ +v_6F  
{ ?4q6>ipx  
 NOTIFYICONDATA data; 'E0{zk  
 data.cbSize=sizeof(NOTIFYICONDATA); f+s'.z%  
 data.hWnd=GetSafeHwnd(); B l'  
 data.uID=98; v>g1\y Iw  
 Shell_NotifyIcon(NIM_DELETE,&data); XFmnZpqXH  
 ShowWindow(SW_SHOW); AY0o0\6cw  
 SetForegroundWindow(); "[H9)aAj7  
 ShowWindow(SW_SHOWNORMAL); sb(,w  
 bTray=FALSE; " %|CD"@  
} {Y'DUt5j  
RgQ\Cs24Q  
void CCaptureDlg::OnChange() \,JRNL&   
{ /Os)4yH\  
 RegisterHotkey(); s Xl7  
} 8pDJz_F!{  
.Rc&EO  
BOOL CCaptureDlg::RegisterHotkey() ^F`FB..:y  
{ 4ej$)AdW3  
 UpdateData(); Qoq@=|7kxa  
 UCHAR mask=0; 7 m&M(ct  
 UCHAR key=0; a|5GC pp  
 if(m_bControl) WLNkO^zb  
  mask|=4; "6pjkEt4  
 if(m_bAlt) ;pb~Zk/[,w  
  mask|=2; 8.jd'yp*J  
 if(m_bShift) V* fDvr0  
  mask|=1; Dw[w%uz  
  key=Key_Table[m_Key.GetCurSel()]; h+.^8fPR   
 if(bRegistered){ V85a{OBm,8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); C(iA G  
  bRegistered=FALSE; 7"*- >mg  
 } pq-zy6^  
 cMask=mask; K( 6=)  
 cKey=key; \s<iM2]Kl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); G~4^`[elB  
 return bRegistered; N3r{|Bu  
} I U 4[}x  
":"M/v%F  
  四、小结 sNX$ =<E  
R,Tw0@{O*  
  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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