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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: \__xTL\  
  ?<efKs  
  一、实现方法 V~MyX&`  
gN; E}AQt  
  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: tUT:v K`  
(i;,D-  
#pragma data_seg("shareddata") ;Z.sK-NJ4  
HHOOK hHook =NULL; //钩子句柄 }Uue}VOA  
UINT nHookCount =0; //挂接的程序数目 J;*2[o.N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3<O=,F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jp880}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Rrw6\iO  
static int KeyCount =0; 8DkZ @}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &t,"k'p  
#pragma data_seg() $bFH%EA.  
~xt]g zp{  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 "h7Np/ m3  
^H`4BWc  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: p735i`8  
t03T1.:(Mg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 66{Dyn7J~  
cKey,UCHAR cMask) e(H{C  
{ X:mm<4  
 BOOL bAdded=FALSE; oer3DD(  
 for(int index=0;index<MAX_KEY;index++){ ijACfl{!:t  
  if(hCallWnd[index]==0){ +:3s f%0  
   hCallWnd[index]=hWnd; =wznkqyhi  
   HotKey[index]=cKey; yA~1$sA1  
   HotKeyMask[index]=cMask; d]vom@iI  
   bAdded=TRUE; 95mwDHbA  
   KeyCount++; p0Pmmp7r  
   break; -,q qQf  
  } *:?XbtIK u  
 } `_e5pW=:>  
 return bAdded; _0o65?F  
} [L=M=;{4  
//删除热键 }poLH S/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1vinO!  
{ "Pl.G[Buc-  
 BOOL bRemoved=FALSE; U;#G $  
 for(int index=0;index<MAX_KEY;index++){ ($Q|9>5,  
  if(hCallWnd[index]==hWnd){ %?Q<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HdRwDW@7=  
    hCallWnd[index]=NULL; #xh M&X  
    HotKey[index]=0;  6apK  
    HotKeyMask[index]=0; A [_T~+-G  
    bRemoved=TRUE; xg;vQKS6  
    KeyCount--; Ui'*$W]v  
    break; ?OFfU  4  
   } vLpIVNA]]Y  
  } |]eWO#vs  
 } U>0bgL  
 return bRemoved; y*!8[wASHq  
} {hoe^07XK  
{wD:!\5  
VV"w{#XKw  
  DLL中的钩子函数如下: 1L%$\0B4hm  
'.]<lh!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WsW]  1p  
{ K!(hj '0.  
 BOOL bProcessed=FALSE; 9^E!2CJ  
 if(HC_ACTION==nCode) ^qLesP#   
 { vi]cl=S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 63QF1*gPH  
   switch(wParam) vr4{|5M  
   {  CYYo+5x  
    case VK_MENU: yCwe:58  
     MaskBits&=~ALTBIT; b+$E*}  
     break; jB,VlL  
    case VK_CONTROL: ko"xR%Q  
     MaskBits&=~CTRLBIT; a5pXn v]A  
     break; gOr%N!5  
    case VK_SHIFT: @M6F?;  
     MaskBits&=~SHIFTBIT; O*yA50Cn  
     break; h0")NBRV&  
    default: //judge the key and send message Ro=dgQ0:t  
     break; ,I H~  
   } ?3gf)g=  
   for(int index=0;index<MAX_KEY;index++){ \46*4?pP  
    if(hCallWnd[index]==NULL) cNMDI  
     continue; u7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o|w w>m  
    { Q]<6voyy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #u3E{NB  
     bProcessed=TRUE; HGF&'@dn  
    } h-\Ov{~  
   } :mhO/Bx  
  } =s9*=5r8  
  else if((lParam&0xc000ffff)==1){ //有键按下 UkcH+0o  
   switch(wParam) \f7R^;`_<R  
   { K{:[0oIHc  
    case VK_MENU: x,HD,VQR/  
     MaskBits|=ALTBIT; % CQv&d2  
     break; {s{+MbD  
    case VK_CONTROL: vy-q<6T}:p  
     MaskBits|=CTRLBIT; N~P1^x~  
     break; 5> !N)pA  
    case VK_SHIFT: BS%pS(  
     MaskBits|=SHIFTBIT; e ^ZY  
     break; WLiFD.  
    default: //judge the key and send message ^fE8|/]nG9  
     break; o5:md :\  
   } @|{8/s Oq  
   for(int index=0;index<MAX_KEY;index++){ 9CAu0N5<  
    if(hCallWnd[index]==NULL) 7rG+)kHG  
     continue; iUs_)1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0"Zxbgu)  
    { ,y@WFRsx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X^rFRk  
     bProcessed=TRUE; 53>(2 _/[r  
    } <d O ~;  
   } 1jE {]/Y7&  
  } !x! 1H5"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 bXA%|7*  
   for(int index=0;index<MAX_KEY;index++){ K"ly\$F  
    if(hCallWnd[index]==NULL) 3p]\l ]=  
     continue; /qFY $vj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p)VMYu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E{}J-_oS45  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #CcEI  
   } @d:GtAW  
  } Gl"hn  
 } 9@}5FoX"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); y9k'jEZ"oh  
} SVObJsB^  
% bKy  
  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: dKhS;!K9p  
FAX[| p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }z,9!{~`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nJ$2RN  
].sD#~L_  
  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: C-g,uARX(r  
/1_O5'5+v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f:6F5G  
{ Xka+1c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %<8r`BMo  
 { ev4_}!  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *9|p}q9n  
  SaveBmp(); 9_8\xLk  
  return FALSE; =RZ PDu  
 } ZXXJ!9-&+J  
 …… //其它处理及默认处理 gyegdky3  
} Y!+H9R  
<[w5M?n8  
hj{)6dBX%  
  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。 ~NLthZ (O  
KT+{-"4-  
  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。 d c/^  
RJKi98xwJ  
  二、编程步骤 R / ND f`  
A~X\ dcn  
  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"; f'*/IG  
g<7Aln}Nl\  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ia-ht>F*;  
k~I]Y,  
  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; CD5% iFy  
My Ky*wD  
  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; 6uKP BL@,  
; 6PRi/@  
  5、 添加代码,编译运行程序。 BoOuN94  
u~>G8y)k9O  
三、程序代码 x-W~&`UU  
j"fx|6l)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL unKl5A[h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !\'H{,G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %3AE2"  
#if _MSC_VER > 1000 pvb&vtp  
#pragma once 1.PN_9%  
#endif // _MSC_VER > 1000 5g O9 <  
#ifndef __AFXWIN_H__ 0*+EYnu+  
#error include 'stdafx.h' before including this file for PCH HF"TS*  
#endif IP@3R(DS%  
#include "resource.h" // main symbols U$3DIJVI  
class CHookApp : public CWinApp #`!mQSK  
{ agE-,  
 public: |=KzQY|u  
  CHookApp(); 5 8 7;2  
  // Overrides #Ma:Av/ )  
  // ClassWizard generated virtual function overrides =F}qT|K  
  //{{AFX_VIRTUAL(CHookApp) sI h5cT  
 public: UFu0{rY_  
  virtual BOOL InitInstance(); u&[L!w  
  virtual int ExitInstance(); 9 W|'~r  
  //}}AFX_VIRTUAL bfm+!9=9S  
  //{{AFX_MSG(CHookApp) cB36w$n8  
  // NOTE - the ClassWizard will add and remove member functions here. "K$c9Z8  
  // DO NOT EDIT what you see in these blocks of generated code ! {qU;;`P]|  
  //}}AFX_MSG "C(yuVK1G  
  DECLARE_MESSAGE_MAP() Lusd kc7  
}; ofw&? Sk0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <mj/P|P@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }q'IY:r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U OGjil{.  
BOOL InitHotkey(); 9Kg yt  
BOOL UnInit(); *SIYZE'  
#endif Vh2uzG  
>B=s+ }/ME  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7l[ @c|e  
#include "stdafx.h" i$`o,m#  
#include "hook.h" ZJc{P5a1J  
#include <windowsx.h> H9i7y,[*  
#ifdef _DEBUG 5j$&Zgx51  
#define new DEBUG_NEW r!O[|h  
#undef THIS_FILE BFhEDkk  
static char THIS_FILE[] = __FILE__; "A&A?%  
#endif \13Q>iAu  
#define MAX_KEY 100 7Z~JuTIZ  
#define CTRLBIT 0x04  "\T-r2  
#define ALTBIT 0x02 V6'u\Ch|  
#define SHIFTBIT 0x01 /U0Hk>$~(  
#pragma data_seg("shareddata") |)" y  
HHOOK hHook =NULL; ryw%0H18  
UINT nHookCount =0; !#WQ8s!?o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g5"I{ol5T~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TJZ/lJU  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey UNwjx7usD  
static int KeyCount =0; !8T04988j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift B|yz~wu S  
#pragma data_seg() _+nk3-yQw  
HINSTANCE hins; v\MQ?VC  
void VerifyWindow(); NZ&ZK@h}.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ao=e{R)  
//{{AFX_MSG_MAP(CHookApp) x?lRObHK  
// NOTE - the ClassWizard will add and remove mapping macros here. WT")tjVKA  
// DO NOT EDIT what you see in these blocks of generated code! _| cSXZ|  
//}}AFX_MSG_MAP 4o;;'P   
END_MESSAGE_MAP() <DPRQhNW]  
jkta]#O  
CHookApp::CHookApp() TC44*BHq  
{ B!;:,(S~  
 // TODO: add construction code here, 7SH3k=x  
 // Place all significant initialization in InitInstance %'_:#!9  
} ;%(sbA  
& 0\:MJc  
CHookApp theApp; 0#Pa;(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .VNz( s  
{ SZLugyZ2Y  
 BOOL bProcessed=FALSE; ?e4H{Y/M  
 if(HC_ACTION==nCode) U`8Er48X  
 { WagL8BpLx  
  if((lParam&0xc0000000)==0xc0000000){// Key up doe3V-if  
   switch(wParam) `OgT"FdL!  
   { <#57q%  
    case VK_MENU: T3<1{"&  
     MaskBits&=~ALTBIT; CGlEc  
     break; O(2c_!d  
    case VK_CONTROL: ]0 = |?n$7  
     MaskBits&=~CTRLBIT; o<txm?+N  
     break; [KHlApL  
    case VK_SHIFT: QV HI}3~  
     MaskBits&=~SHIFTBIT; ='w 2"4  
     break; ?u?mSO/  
    default: //judge the key and send message 'J-a2oiM(  
     break; #NGtba  
   } 7&wxnxSk^  
   for(int index=0;index<MAX_KEY;index++){ WcS`T?Xa  
    if(hCallWnd[index]==NULL) d4ld-y  
     continue; tKcC{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G4P*U3&p  
    { \'[tfSB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ii5U) "  
     bProcessed=TRUE; [7HBn  
    } !.q99DB  
   } hcRe,}wJ  
  } jP_s(PQ  
  else if((lParam&0xc000ffff)==1){ //Key down ~_"V7  
   switch(wParam) 8@(?E[&O>  
   { @_$$'XA7  
    case VK_MENU: lF.kAEC  
     MaskBits|=ALTBIT; V!Sm,S(  
     break; 3{t[>O;  
    case VK_CONTROL: _deEs5i  
     MaskBits|=CTRLBIT; X$1YvYsID  
     break; ~|Ln9f-g  
    case VK_SHIFT: fe`_0lxj  
     MaskBits|=SHIFTBIT; _[rQt8zn  
     break; dQ-shfTr]  
    default: //judge the key and send message j$XaO%y)  
     break; v=hn# U  
   } 60$;Q,]o  
   for(int index=0;index<MAX_KEY;index++) _h  \L6.  
   { [kqtkgK$j2  
    if(hCallWnd[index]==NULL) [q3zs_nz  
     continue;  $RRX-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }N(gP_?n  
    { %C qp88]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); );JWrkpz  
     bProcessed=TRUE; Qc?W;Q+  
    } p%sizn  
   } yp^k;G?_d  
  } Iy4%,8C]g  
  if(!bProcessed){ 1P1h);*Z  
   for(int index=0;index<MAX_KEY;index++){ EmrkaV-?k  
    if(hCallWnd[index]==NULL) LL (TD&  
     continue; W^xO/xu1 /  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [xrsa!$   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7}~w9jK"F  
   } [ 't.x=  
  } yhbU;qEG9  
 } N\Lu+ x5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PX/{!_mM  
} 7=u Gf$/  
+^esL9RG:  
BOOL InitHotkey() {D..(f1*u  
{ Ri_2@U-  
 if(hHook!=NULL){ z#PaQp5F  
  nHookCount++; ru9@|FgAE  
  return TRUE; NQ[X=a8N  
 } ty#6%  
 else P*7G?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y Z8[h`z  
  if(hHook!=NULL) Q4LPi;{\  
   nHookCount++; Y G8C<g6E7  
  return (hHook!=NULL); (t V T&eO  
} [:gg3Qzx  
BOOL UnInit() {5X,xdzR  
{ _4L6  
 if(nHookCount>1){ 5fiWo^s}  
  nHookCount--; bQq/~  
  return TRUE; K x) PK  
 } LS9,:!$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I}|a7,8   
 if(unhooked==TRUE){ *VJISJC  
  nHookCount=0; iEr?s-or  
  hHook=NULL; ilJ`_QN  
 } 0k16f3uI   
 return unhooked; *<67h*|)  
} >2pxl(i  
-2[4 @  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BgT ^  
{ S#8)N`  
 BOOL bAdded=FALSE; D QxuV1  
 for(int index=0;index<MAX_KEY;index++){ 7 rRI-wZ  
  if(hCallWnd[index]==0){ 1_f+! ns#  
   hCallWnd[index]=hWnd; Udtz zka  
   HotKey[index]=cKey; ElB[k<  
   HotKeyMask[index]=cMask; c"lwFr9x7  
   bAdded=TRUE; T"za|Fo  
   KeyCount++; U_PH#e  
   break; i6n,N)%H  
  } F09%f"9  
 } "h[)5V{  
 return bAdded; 1`L.$T,1!  
} $"|r7n5[  
m^qFaf)6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K`9~#Zx$  
{ =_C&lc"  
 BOOL bRemoved=FALSE; 5j]!r  
 for(int index=0;index<MAX_KEY;index++){ O<L=N-  
  if(hCallWnd[index]==hWnd){ U*Y]cohh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2/V%jS[4#y  
    hCallWnd[index]=NULL; |T/OOIA=sI  
    HotKey[index]=0; a5 ZXrWv  
    HotKeyMask[index]=0; 9XDSL[[  
    bRemoved=TRUE; x X3I`  
    KeyCount--; Q[NoFZ V!  
    break; ~>9G\/u j  
   } bK0(c1*a[e  
  } jR[c3EA ;  
 } &a=rJvnIO&  
 return bRemoved; 8+gp"!E  
} j?|Vx'  
w8Z#]kRv  
void VerifyWindow() `3VI9GmQ  
{ <2 [vR|Q*  
 for(int i=0;i<MAX_KEY;i++){ ]nRf%Vi8g  
  if(hCallWnd!=NULL){ 57;0,k5Gy  
   if(!IsWindow(hCallWnd)){ 5,^DT15a4P  
    hCallWnd=NULL; G,?a8(  
    HotKey=0; 59j`Z^e  
    HotKeyMask=0;  {p/Yz#  
    KeyCount--; +kYp!00  
   } ]k]bLyz\J  
  } B1~`*~@  
 } K*DH_\SPK  
} \ Xh C  
)6p6<y  
BOOL CHookApp::InitInstance() "k@[7 7  
{ Pi?G:IF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); U7n#TPet  
 hins=AfxGetInstanceHandle(); +3zQ"lLD^  
 InitHotkey(); [DeDU:  
 return CWinApp::InitInstance(); Ty{ SZU J  
} fm^`   
VUUnB<j  
int CHookApp::ExitInstance() PH8 88O  
{ nZ'jjS[!  
 VerifyWindow(); Nk\ni>Du3  
 UnInit(); H#YI7l2  
 return CWinApp::ExitInstance(); /"A=Yf  
} ai?J  
2Ul8<${c{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EHf,VIC8  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V~/@KU8cH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ '9.@r\g  
#if _MSC_VER > 1000 M"s:*c_6  
#pragma once iOv>g-t:  
#endif // _MSC_VER > 1000 =e#h;x2  
n]4Elrxx  
class CCaptureDlg : public CDialog (#>X*~6  
{ Fyw X  
 // Construction O-p`9(_m  
 public: DN=W2MEfc  
  BOOL bTray; =kwz3Wv  
  BOOL bRegistered; w$iPFZC'  
  BOOL RegisterHotkey(); :qj^RcmVPL  
  UCHAR cKey; ydOG8EI  
  UCHAR cMask; Oj%5FUP~[%  
  void DeleteIcon(); 'Y ,2CN  
  void AddIcon(); x5PM ]~"p  
  UINT nCount; s92ol0`  
  void SaveBmp();  9Ca0Tu  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7DK}c]js  
  // Dialog Data tpA-IL?KQw  
  //{{AFX_DATA(CCaptureDlg) ~Y~M}4  
  enum { IDD = IDD_CAPTURE_DIALOG }; aiz ws[C  
  CComboBox m_Key; }[!=O+g O  
  BOOL m_bControl; 0%&}wUjV  
  BOOL m_bAlt; A*+gWn,4Y_  
  BOOL m_bShift; (c}!gjm  
  CString m_Path; yLCMu | +  
  CString m_Number; d42Y `Wu  
  //}}AFX_DATA \/ri|fm6l#  
  // ClassWizard generated virtual function overrides DS%]7,g]  
  //{{AFX_VIRTUAL(CCaptureDlg) .7Yox1,  
 public: 5({_2meJ:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X8*~Cf73u  
 protected: F~rl24F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l{^s4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); > JA-G@3i  
  //}}AFX_VIRTUAL |LLpG37_  
  // Implementation |dHtv6I  
 protected: 9wf"5c  
  HICON m_hIcon; ZZHQ?p-  
  // Generated message map functions Tzj v-9^V  
  //{{AFX_MSG(CCaptureDlg) 0w TOdCvmb  
  virtual BOOL OnInitDialog(); G!C }ULq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H-e$~vEbP  
  afx_msg void OnPaint(); Z VdQ$  
  afx_msg HCURSOR OnQueryDragIcon(); a"O;DYh  
  virtual void OnCancel(); p]y.N)a  
  afx_msg void OnAbout(); SfY 5Xgp  
  afx_msg void OnBrowse(); 32aI0CT  
  afx_msg void OnChange(); R87@.  
 //}}AFX_MSG H2[0@|<<  
 DECLARE_MESSAGE_MAP() fH9"sBiO  
}; Ex]Ku  
#endif xuqG)HthRS  
w1zMY:9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #M!{D  
#include "stdafx.h"  <{ v %2  
#include "Capture.h" &|'yqzS3  
#include "CaptureDlg.h" Mby4(M+&n  
#include <windowsx.h> uR2|>m  
#pragma comment(lib,"hook.lib") ^uw]/H3?L  
#ifdef _DEBUG bnvY2-O6  
#define new DEBUG_NEW 1D [>oK\  
#undef THIS_FILE &CXk=Wj  
static char THIS_FILE[] = __FILE__; t&x\@p9  
#endif /L(}VJg-  
#define IDM_SHELL WM_USER+1 +]wM$bP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =Sr<d|\O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ] FvGAG.*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "B +F6  
class CAboutDlg : public CDialog Pz D30VA  
{ QAo/d4  
 public: u~ FVI  
  CAboutDlg(); Oop6o $k  
  // Dialog Data wmR~e  
  //{{AFX_DATA(CAboutDlg) ^@=4HtA  
  enum { IDD = IDD_ABOUTBOX }; lqrI*@>Tz  
  //}}AFX_DATA ,1CmB@  
  // ClassWizard generated virtual function overrides b$nev[`{6  
  //{{AFX_VIRTUAL(CAboutDlg) SQ+r'g  
 protected: =tA;JB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~9k E.  
  //}}AFX_VIRTUAL ^  ~1QA  
  // Implementation s%vy^x29  
 protected: ui`EODhA(  
  //{{AFX_MSG(CAboutDlg) "D4% A!i  
  //}}AFX_MSG (s|WmSQ  
  DECLARE_MESSAGE_MAP() x7gd6"10^  
}; (w"(RM~  
WQ:Y NmQ1p  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GZx*A S]+  
{ UNv!G/i-5  
 //{{AFX_DATA_INIT(CAboutDlg) /7+b.h])^  
 //}}AFX_DATA_INIT =\5f_g2M  
} G[u6X_Q  
yEh{9S%6p  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n dN*X'  
{ >hG*=4oh  
 CDialog::DoDataExchange(pDX); hiV!/}'7  
 //{{AFX_DATA_MAP(CAboutDlg) }{,Wha5\n  
 //}}AFX_DATA_MAP (igB'S5wf  
} >fT%CGLC0  
X6t9*|C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KMqGWO*  
 //{{AFX_MSG_MAP(CAboutDlg) !vK0|eV3  
 // No message handlers >6WZSw/Hq  
 //}}AFX_MSG_MAP B2LXF3#/  
END_MESSAGE_MAP() y|0/;SjV  
 Q3bU"f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WL,2<[)Ew  
: CDialog(CCaptureDlg::IDD, pParent) c 8Q2H  
{ w<]-~`K  
 //{{AFX_DATA_INIT(CCaptureDlg) 1!U:M8T|  
  m_bControl = FALSE; jyyig%  
  m_bAlt = FALSE; - 3PLP$P  
  m_bShift = FALSE; ([rSYKpi  
  m_Path = _T("c:\\"); <:nyRy}  
  m_Number = _T("0 picture captured."); HFyQ$pbBU  
  nCount=0; !OPHS^L  
  bRegistered=FALSE; %yfl-c(u  
  bTray=FALSE; b *0uxvLu  
 //}}AFX_DATA_INIT !:esdJH  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L0=`1q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LLzxCMc9*  
} UpSJ%%.n  
!5[SNr3^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /$\8?<Pc".  
{ 6;!)^b  
 CDialog::DoDataExchange(pDX); #s>'IPc0  
 //{{AFX_DATA_MAP(CCaptureDlg) jRDvVV/-wr  
  DDX_Control(pDX, IDC_KEY, m_Key); %{^|Av1Uz  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); R/E6n &R  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \x4:i\Fx@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); DVg$rm`  
  DDX_Text(pDX, IDC_PATH, m_Path); ?Oy0p8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); W 9}xfy09  
 //}}AFX_DATA_MAP cud9oJ-=;  
} 7D 3-/_v  
>/}p{Tj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) s!MD8i a  
//{{AFX_MSG_MAP(CCaptureDlg) kj4=Q\Rfm  
 ON_WM_SYSCOMMAND() 5X5UUdTM  
 ON_WM_PAINT() @y * TVy  
 ON_WM_QUERYDRAGICON() `*kl>}$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H=Cj/jE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N6+^}2' *)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Y8lZ]IB  
//}}AFX_MSG_MAP SH8zkAA7u}  
END_MESSAGE_MAP() 8s[1-l  
-lv(@7o~  
BOOL CCaptureDlg::OnInitDialog() $XkO\6kh  
{ gyh8  
 CDialog::OnInitDialog(); V=1zk-XC  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jr#*;go  
 ASSERT(IDM_ABOUTBOX < 0xF000); E&@#*~   
 CMenu* pSysMenu = GetSystemMenu(FALSE); <_=O0 t| 6  
 if (pSysMenu != NULL) c1y+k vv  
 { b<"jmB{  
  CString strAboutMenu; WMWMb3  
  strAboutMenu.LoadString(IDS_ABOUTBOX); QSM3qke  
  if (!strAboutMenu.IsEmpty()) R(P(G;#j  
  { 0sme0"Sl  
   pSysMenu->AppendMenu(MF_SEPARATOR); #QSSpsF@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Sx0{]1J  
  } @k'V`ZQF  
 } ^f"|<r  
 SetIcon(m_hIcon, TRUE); // Set big icon T VSCjI  
 SetIcon(m_hIcon, FALSE); // Set small icon Ux=B*m1@{  
 m_Key.SetCurSel(0); 0mmHN`<  
 RegisterHotkey(); gnxD'1_  
 CMenu* pMenu=GetSystemMenu(FALSE); r[GH#vF;7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  _X=6M gU  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zA3r&stN+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IQ-l%x[fue  
 return TRUE; // return TRUE unless you set the focus to a control asmu<  
} Lg#(?tMp,'  
{7%HK2='  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \\Q){\S  
{ 3=Rk(%:;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5e7\tBab  
 { Q%J,: J  
  CAboutDlg dlgAbout; S}]B|Q  
  dlgAbout.DoModal(); OZ"76|H1`  
 } !g=b=YK  
 else s&$e}yxVO  
 { Zv-1*hhHf  
  CDialog::OnSysCommand(nID, lParam); jWh)bsqI!  
 } !)W#|sys&  
} ]Ge>S?u  
ryA+Lli.  
void CCaptureDlg::OnPaint() |68/FJZ,5  
{ -O-?hsV)y  
 if (IsIconic()) g4+Hq *  
 { .ns=jp  
  CPaintDC dc(this); // device context for painting B8.}9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a+a6P5kJ  
  // Center icon in client rectangle /nX_Q?mo  
  int cxIcon = GetSystemMetrics(SM_CXICON); IX<9_q  
  int cyIcon = GetSystemMetrics(SM_CYICON); :7dc;WdM  
  CRect rect; ^L7!lzyo  
  GetClientRect(&rect); &1`Y&x:p  
  int x = (rect.Width() - cxIcon + 1) / 2; A2A_F|f  
  int y = (rect.Height() - cyIcon + 1) / 2; v.u 5%  
  // Draw the icon e+VE FWz  
  dc.DrawIcon(x, y, m_hIcon); h9iQn<lp4.  
 } R?- zJ ;  
 else cN&:V2,  
 { C|3cQ{  
  CDialog::OnPaint(); ZBN,%P!P0  
 } +Kg }R5+  
} BD86t[${W  
asLrXGGyT  
HCURSOR CCaptureDlg::OnQueryDragIcon() |R!ozlL{}  
{ k9:|CEP  
 return (HCURSOR) m_hIcon; 49}WJC7 )  
} lB_X mI1t  
~82 {Y _{/  
void CCaptureDlg::OnCancel() T34Z#PFwe  
{ oj)(.X<8N  
 if(bTray) N#$]W"U  
  DeleteIcon(); PCV#O63[  
  CDialog::OnCancel(); Q&^\YgkCf  
} &%qDi_UD  
Tm7LaM  
void CCaptureDlg::OnAbout() MEp{&#v|1  
{ b0@K ~O;g  
 CAboutDlg dlg; gwXmoM5  
 dlg.DoModal(); bw7gL\*  
} u7Ix7`V  
?.lo[X<,*  
void CCaptureDlg::OnBrowse() KtH^k&z.f  
{ qK9A /Mc  
 CString str; k%kEW%I yG  
 BROWSEINFO bi; 'd&4MA0X  
 char name[MAX_PATH]; |3Oyg?2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); t imY0fx #  
 bi.hwndOwner=GetSafeHwnd(); yx:+Xy*N  
 bi.pszDisplayName=name; Y5;afU='  
 bi.lpszTitle="Select folder"; w9O!L9 6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >gM"*Laa?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `8Ych@f]  
 if(idl==NULL) uwZ,l-6T  
  return; <o*b6 m%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6-J}ZfGj  
 str.ReleaseBuffer(); y'>JT/Q5  
 m_Path=str; o8hE.pf&  
 if(str.GetAt(str.GetLength()-1)!='\\') 6?C';1  
  m_Path+="\\"; dG]B-(WTC  
 UpdateData(FALSE); ?K:. Pa  
} c=9A d  
&1&OXm$  
void CCaptureDlg::SaveBmp() ^yq}>_  
{ vNl)ltzJF  
 CDC dc; dga4|7-MY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BGwD{6`U  
 CBitmap bm; kN8B,  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?TK`sGy  
 int Height=GetSystemMetrics(SM_CYSCREEN); X!'C'3X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); t,*1=S5  
 CDC tdc; )|k#cT{=M  
 tdc.CreateCompatibleDC(&dc); UwF-*(#41  
 CBitmap*pOld=tdc.SelectObject(&bm); .QwB7+V4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I.T?A9Z  
 tdc.SelectObject(pOld); DG0I- "s  
 BITMAP btm; !cM<&3/  
 bm.GetBitmap(&btm); "19#{yX4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *FZav2]-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4# ]g852  
 BITMAPINFOHEADER bih; M6^ \LtFt  
 bih.biBitCount=btm.bmBitsPixel; cL;%2TMk  
 bih.biClrImportant=0; HX}B#T  
 bih.biClrUsed=0; 3;> z %{  
 bih.biCompression=0; ]j6K3  
 bih.biHeight=btm.bmHeight; )cZHBG.0H  
 bih.biPlanes=1; .>.GQUr  
 bih.biSize=sizeof(BITMAPINFOHEADER); #=33TvprR2  
 bih.biSizeImage=size;  G +41D  
 bih.biWidth=btm.bmWidth; bj6Yz,g F  
 bih.biXPelsPerMeter=0; }Bsh!3D<.  
 bih.biYPelsPerMeter=0; #)twk `!^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d ePk}Sn  
 static int filecount=0; U=69q]  
 CString name; B7|%N=S%/  
 name.Format("pict%04d.bmp",filecount++); <j,3Dn  
 name=m_Path+name; e.%I#rNI  
 BITMAPFILEHEADER bfh; &ni#(   
 bfh.bfReserved1=bfh.bfReserved2=0; WG,1%=M@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^,AE;Z T7  
 bfh.bfSize=54+size; Q@>1z*'I  
 bfh.bfOffBits=54; C<I?4WM  
 CFile bf; -$0}rfX  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1r}i[5  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U1E@pDH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v {uq  
  bf.WriteHuge(lpData,size); 2 rf8)8':  
  bf.Close(); n8_X<jIp3  
  nCount++; =N{?ll6x7g  
 } *i:8g(  
 GlobalFreePtr(lpData); l>pB\<LL  
 if(nCount==1) xRhGBb{@s  
  m_Number.Format("%d picture captured.",nCount); oq!\100  
 else K\XQ E50  
  m_Number.Format("%d pictures captured.",nCount); F~ \ONO5  
  UpdateData(FALSE); hif;atO  
} ?Fn y_{&^H  
ort*Ux)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) CsycR@[  
{ ?YZgH>7"  
 if(pMsg -> message == WM_KEYDOWN) #0uu19+}  
 { "RK"Pn+  
  if(pMsg -> wParam == VK_ESCAPE) Mog [,{w  
   return TRUE; C,W_0= !e  
  if(pMsg -> wParam == VK_RETURN) A:GqR;;"x>  
   return TRUE; HJ]e%og  
 } vN],9 q  
 return CDialog::PreTranslateMessage(pMsg); rg k1.0U0  
} "#7Q}d!x  
f77W{T4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L/-SWid)  
{ @<pd@Mpf]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R8u8jG(4  
  SaveBmp();  aY(s &  
  return FALSE; DT>`.y%2W  
} F9K`N8wlu  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iv6G9e{cx  
 CMenu pop; gWa0x-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j y5[K.  
 CMenu*pMenu=pop.GetSubMenu(0); % H"  
 pMenu->SetDefaultItem(ID_EXITICON); 5CN=a2&  
 CPoint pt; C=q&S6/+  
 GetCursorPos(&pt); h'=)dFw7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); { >izfG,\  
 if(id==ID_EXITICON) \i//Aq  
  DeleteIcon(); 8w:mL^6x  
 else if(id==ID_EXIT) mhhc}dS(H  
  OnCancel(); 8~-TN1H  
 return FALSE; 3))R91I  
} Ua 6O~,\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;7?oJH;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H,w8+vZ4\  
 AddIcon(); wZ\93W-}  
 return res; X;6;v]  
} #xu1 eX0<  
=0Y0o_  
void CCaptureDlg::AddIcon() \:1$E[3v  
{ sfw* _}y  
 NOTIFYICONDATA data; x,10o   
 data.cbSize=sizeof(NOTIFYICONDATA); &`n:AR`  
 CString tip; p19(>|$J  
 tip.LoadString(IDS_ICONTIP); .$x}~Sw  
 data.hIcon=GetIcon(0); 9v*y&V9/  
 data.hWnd=GetSafeHwnd(); JluA?B7E  
 strcpy(data.szTip,tip); Tr:@Dv.O  
 data.uCallbackMessage=IDM_SHELL; oYf+I  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; juWXB+d2Y  
 data.uID=98; pqpsa'  
 Shell_NotifyIcon(NIM_ADD,&data); jFe8s@7  
 ShowWindow(SW_HIDE); vvxD}p=y  
 bTray=TRUE; L v/}&'\(  
} u;rmqo1  
RS}_cm0  
void CCaptureDlg::DeleteIcon() L3wj vq^  
{ ]oSx]R>{f  
 NOTIFYICONDATA data; YQ d($  
 data.cbSize=sizeof(NOTIFYICONDATA);  wk8fa  
 data.hWnd=GetSafeHwnd(); S>(xx"Ia  
 data.uID=98; FO^6c  
 Shell_NotifyIcon(NIM_DELETE,&data); 4C_1wk('  
 ShowWindow(SW_SHOW); 5!Y\STn  
 SetForegroundWindow(); Wc+(xk  
 ShowWindow(SW_SHOWNORMAL);  gvo98Id  
 bTray=FALSE; NR_3nt^h  
} GiuE\J9i  
(EWGX |QA  
void CCaptureDlg::OnChange() E`^ D9:3:)  
{ 4 5.g;  
 RegisterHotkey(); ZZ^A&%E(a  
} `^8mGR>OpI  
af>i  
BOOL CCaptureDlg::RegisterHotkey() L,#YP#O,j  
{ rqN+0CT  
 UpdateData(); |z_Dw$-xm  
 UCHAR mask=0; 5cQ]vb  
 UCHAR key=0; v}t{*P  
 if(m_bControl) 4+ d(d  
  mask|=4; @aUNyyVP  
 if(m_bAlt) F1$XUos9  
  mask|=2; ,WOCG 2h  
 if(m_bShift) {{P 3Z[  
  mask|=1; =#9#unvE!  
  key=Key_Table[m_Key.GetCurSel()]; qG 20  
 if(bRegistered){ } #e=*8F7  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _^b\#Jz4U3  
  bRegistered=FALSE; ]O:8o<0  
 } z-We>KX  
 cMask=mask; "OI$PLK  
 cKey=key; >E4,zs@7t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |iBf6smF  
 return bRegistered; CT|0KB&  
} UQh.o   
8h|}Q_  
  四、小结 (&Q!5{$W  
y,&[OrCm^\  
  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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