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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: F3v !AvA|  
  -aPg#ub  
  一、实现方法 I {S;L  
b9KP( _  
  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: HZzDVCU  
G_3O]BMKd)  
#pragma data_seg("shareddata") j^j1  
HHOOK hHook =NULL; //钩子句柄 \:# L)   
UINT nHookCount =0; //挂接的程序数目 G~^r)fm_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fo*2:?K&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H1pO!>M  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /yDz/>ID\  
static int KeyCount =0; cz#rb*b  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6y%qVx#!  
#pragma data_seg() c)TPM/>(p  
#zv3b[@  
  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。 "/*\1v9  
N ,'GN[s  
  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: B4c]}r+  
-LoZs ru  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8`q:Gz=M\  
cKey,UCHAR cMask) rxgbV.tx  
{ =r?hg GWe  
 BOOL bAdded=FALSE; | C;=-|  
 for(int index=0;index<MAX_KEY;index++){ k$z_:X  
  if(hCallWnd[index]==0){ (Y.k8";)`  
   hCallWnd[index]=hWnd; G\/zkrxmv  
   HotKey[index]=cKey; Yh@JXJ>  
   HotKeyMask[index]=cMask; n71r_S*  
   bAdded=TRUE; *KZYv=s,u  
   KeyCount++; M)J5;^["  
   break; RVnjNy;O`  
  } iW]j9}t  
 } v}}F,c(f  
 return bAdded; 7Utn\l  
} b$d;Qx  
//删除热键 'Vzp2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  acajHs  
{ [i21FX  
 BOOL bRemoved=FALSE; xBThq?N?  
 for(int index=0;index<MAX_KEY;index++){ zsEc(  
  if(hCallWnd[index]==hWnd){ 9|^2",V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {k>&?Vd!  
    hCallWnd[index]=NULL; Z, zWuE3  
    HotKey[index]=0; ^b4 9  
    HotKeyMask[index]=0; )al]*[lY  
    bRemoved=TRUE; VZp5)-!\  
    KeyCount--; 9tU]`f  
    break; ''A_[J `>  
   } 2@n{yYwy  
  } [`#CXq'  
 } O%WIf__Q  
 return bRemoved; #`qx<y*S  
} dc+>m,3$  
!fV+z%:  
(R[[Z,>w.  
  DLL中的钩子函数如下: m4[;(1  
|{z:IQLv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) FZ{h?#2?  
{ : Xda1S  
 BOOL bProcessed=FALSE; CmP9Q2  
 if(HC_ACTION==nCode) gDQ^)1k  
 { G)AqbY  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 J|W<;  
   switch(wParam) 1jmjg~W  
   {  JK7G/]j+Ez  
    case VK_MENU: EKYY6S2  
     MaskBits&=~ALTBIT; P>y@kPi   
     break; :(E@Gf  
    case VK_CONTROL: 5N#aXG^9  
     MaskBits&=~CTRLBIT; A]_7}<<N  
     break; pQyK={7?`  
    case VK_SHIFT: mxvp3t \  
     MaskBits&=~SHIFTBIT; b <tNk]7  
     break; >2Y=*K,:  
    default: //judge the key and send message sf:,qD=z  
     break; 3H'sHuK"X  
   } KaLzg5is  
   for(int index=0;index<MAX_KEY;index++){ Z\(q@3C  
    if(hCallWnd[index]==NULL) -vAC"8)S  
     continue; j"8ZM{aO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SpIv#?  
    { [$ubNk;!z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z{%<<pZ  
     bProcessed=TRUE; @f_Lp%K  
    } I }a`0Y&{  
   } ")1:F>  
  } DHg :8%3x  
  else if((lParam&0xc000ffff)==1){ //有键按下 y B81f  
   switch(wParam) *[Imn\hu  
   { H9Gh>u]}  
    case VK_MENU: RF?`vRZOe  
     MaskBits|=ALTBIT; 0gu_yg!R  
     break; 77 Q5d"sIi  
    case VK_CONTROL: /m!BY}4W  
     MaskBits|=CTRLBIT; #JqB ;'\  
     break; xS5vbJ  
    case VK_SHIFT: ^7`BP%6  
     MaskBits|=SHIFTBIT; [>vLf2OID  
     break; ~V:\ _{mE  
    default: //judge the key and send message N_LM/of|D  
     break; WSP I|#Xr%  
   } 8$] 1M,$r  
   for(int index=0;index<MAX_KEY;index++){ n.}ZkG0`  
    if(hCallWnd[index]==NULL) 7RQR)DG  
     continue; "-E\[@/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &.F4 b~A7  
    { `{8K.(])s!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1;* cq  
     bProcessed=TRUE; FBG4pb9=~  
    } K$z2YJ%  
   } `C,n0'PL.  
  } x[| }.Ew  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  > ^O7  
   for(int index=0;index<MAX_KEY;index++){ \Zb;'eDv  
    if(hCallWnd[index]==NULL) ImA @}:  
     continue; qRu~$K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -D<< kra  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k<z )WNBf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 d.aS{;pse  
   } i[i4h"$0  
  } JT~4mT  
 } I !- U'{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,S\CC{!  
} S0$8@"~=  
9FF0%*tGo  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ufj,T7g^  
AI2~Jp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [=C6U_vU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v<k?Vu  
;cNv\t  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: y-Fo=y  
^ G]J,+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -$\y_?}  
{ J @`1TU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mb 1FWy=3  
 { }ZYd4h|g\z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3s*mbk[J  
  SaveBmp(); A]*}HZ ,  
  return FALSE; _9ao?:  
 } +tB=OwU%0  
 …… //其它处理及默认处理 ]IaMp788  
} ~"gA,e-)  
rV.}PtcFY  
C-xr"]#]  
  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。 @b\$yB@z  
1> ?M>vK  
  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。 $yP*jO4i  
5; C|  
  二、编程步骤 VCYwzB  
, };& tR  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; #-rH1h3*q  
0^ _uV9r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; XoK:N$\}t  
$L `d&$Vh  
  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; XE RUo  
TT%M' 5&  
  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; _IMW {  
e v}S+!|U  
  5、 添加代码,编译运行程序。 Brw@g8w-X  
kb%;=t2  
三、程序代码 H.P_]3f  
a"1t-x  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #&+{mCjs  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 85= )lu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ PxX 4[ P  
#if _MSC_VER > 1000 LG0;#3YwH  
#pragma once h#I>M`|  
#endif // _MSC_VER > 1000 4IK( 7  
#ifndef __AFXWIN_H__ fy1|$d{'  
#error include 'stdafx.h' before including this file for PCH Mc lkEfn  
#endif ]2A^1Del  
#include "resource.h" // main symbols S)(.,x  
class CHookApp : public CWinApp + /G2fhE  
{ {L971W_L  
 public: 2YL?,uLS  
  CHookApp(); +bxYG D  
  // Overrides &$BjV{,/zc  
  // ClassWizard generated virtual function overrides !vi> U|rh  
  //{{AFX_VIRTUAL(CHookApp) D_2:k'4  
 public: j8i[ONq^  
  virtual BOOL InitInstance(); >IafUy  
  virtual int ExitInstance(); te`$%NRl  
  //}}AFX_VIRTUAL |T /ZL!  
  //{{AFX_MSG(CHookApp) sFKX-S~:  
  // NOTE - the ClassWizard will add and remove member functions here. AOZP*\k  
  // DO NOT EDIT what you see in these blocks of generated code ! Y;eZ9|Ht9  
  //}}AFX_MSG [|wZ77\  
  DECLARE_MESSAGE_MAP() -:^U_FL8un  
}; n)/z0n!\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ZmqKQO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QpH'PYy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W-f=]eWg  
BOOL InitHotkey(); >gQ>1Bwvi  
BOOL UnInit(); yqs4[C  
#endif C.:<-xo  
u]wZQl#-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .8g)av+  
#include "stdafx.h" Eh`7X=Z7E  
#include "hook.h" Ufj`euY  
#include <windowsx.h> 9)yJ: N#F  
#ifdef _DEBUG .~db4d]  
#define new DEBUG_NEW KM0ru  
#undef THIS_FILE  'c&Ed  
static char THIS_FILE[] = __FILE__; lgAoJ[  
#endif g9pZ\$J&  
#define MAX_KEY 100 h f)?1z4  
#define CTRLBIT 0x04 $p8xEcQdU#  
#define ALTBIT 0x02 Tb}4wLu  
#define SHIFTBIT 0x01 Rh2+=N<X  
#pragma data_seg("shareddata") OKZV{Gja  
HHOOK hHook =NULL; PNhe  
UINT nHookCount =0; GMx&y2. Z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @u+]aI!`-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `RT>}_j  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey iXkF1r]i  
static int KeyCount =0; )* :gqN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]#<4vl\  
#pragma data_seg() ]EbM9Fo-U  
HINSTANCE hins; K g*Q  
void VerifyWindow(); NX.6px17  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?,Xw[pR  
//{{AFX_MSG_MAP(CHookApp) ;O5zUl-`  
// NOTE - the ClassWizard will add and remove mapping macros here. Ty\R=y}}  
// DO NOT EDIT what you see in these blocks of generated code! B IEO,W|  
//}}AFX_MSG_MAP +480 l}  
END_MESSAGE_MAP() ,pfG  
%Xg4b6<9  
CHookApp::CHookApp() R{4^t97wH{  
{ P:S.~Jq  
 // TODO: add construction code here, uc{Ihw  
 // Place all significant initialization in InitInstance g/_5unI}u  
} 5~U/   
2W(s(-hD  
CHookApp theApp; X0 5/uX{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h&iC;yj=  
{ P5V}#;v  
 BOOL bProcessed=FALSE; \7eUw,~Q>  
 if(HC_ACTION==nCode) ,t744k')  
 { UgRiIQMq.  
  if((lParam&0xc0000000)==0xc0000000){// Key up 539>WyG5  
   switch(wParam) Es`Px_k  
   { s) t@ol  
    case VK_MENU: M?49TOQA  
     MaskBits&=~ALTBIT; ;d$rdFA_  
     break; qq`4<0I>  
    case VK_CONTROL: nPtuTySG  
     MaskBits&=~CTRLBIT; bs&43Ae  
     break; }K>d+6qk5  
    case VK_SHIFT: dDMJ'  
     MaskBits&=~SHIFTBIT; {?0lBfB"  
     break; 3%|&I:tI  
    default: //judge the key and send message i"FtcP^  
     break; zk+9'r`-D  
   } {z|)Njhg  
   for(int index=0;index<MAX_KEY;index++){ ,ng Cv;s  
    if(hCallWnd[index]==NULL) xa*hi87L*  
     continue; I,DS@SK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v~C Czg  
    { J{<X 7uB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Hio0HL-  
     bProcessed=TRUE; S+6.ZZ9c  
    } ,THw"bm  
   } { uFO/  
  } Qljpx?E  
  else if((lParam&0xc000ffff)==1){ //Key down V &T~zh1  
   switch(wParam) MJ)RvNF  
   { 8W7J3{d  
    case VK_MENU: I][*j  
     MaskBits|=ALTBIT; 1.hyCTnI  
     break; Ee#q9Cx^J  
    case VK_CONTROL: ?UR0:f:}oc  
     MaskBits|=CTRLBIT;  }v{LRRi  
     break; $wa{~'  
    case VK_SHIFT: E&w7GZNt  
     MaskBits|=SHIFTBIT; nFCC St$  
     break; BOX2O.Pm  
    default: //judge the key and send message 6|=f$a  
     break; }>|s=uGW  
   }  /maJtX'  
   for(int index=0;index<MAX_KEY;index++) 2tO,dx  
   { Rp7mh]kZ  
    if(hCallWnd[index]==NULL) MN>b7O \.?  
     continue; 9=tIz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d-ko ^Y0  
    { j;r-NCBnz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {Xy5pfW Q  
     bProcessed=TRUE; 4_lrg|X1  
    } 1I6px$^E\  
   } r;2^#6/Z  
  } .Hm>i  
  if(!bProcessed){ Jpq~  
   for(int index=0;index<MAX_KEY;index++){ t?gic9 q  
    if(hCallWnd[index]==NULL) T!{w~'=F  
     continue; fOrH$?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kZ:ZtE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f~[7t:WD*  
   } t@;p  
  } B[Scr5|  
 } P+sW[:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3?yg\  
} (C L%>5V  
l'qg8  
BOOL InitHotkey() n@i HFBb  
{ T-L||yE,h  
 if(hHook!=NULL){ r6qj7}\  
  nHookCount++; z<;HQX,  
  return TRUE; Or+U@vAnk  
 }  _[3D  
 else "sCRdx]_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +\A,&;!SR  
  if(hHook!=NULL) 3hH<T.@)  
   nHookCount++; =nS3p6>rZ  
  return (hHook!=NULL); #!# l45p6  
} ]6` %  
BOOL UnInit() yyJ  f%{  
{ !.gIHY  
 if(nHookCount>1){ ITBE|b  
  nHookCount--; p l0\2e)  
  return TRUE; 3$R1ipb  
 } e !Y~Qy  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !pW0qX\1n  
 if(unhooked==TRUE){ T^KKy0ZGM  
  nHookCount=0; /~?*=}c^m  
  hHook=NULL; GxxW&y  
 } %> eiAB_b  
 return unhooked; 2zb"MEOS5  
} Kc-W&?~y#1  
fr3d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y%T_pTcU  
{ eym4=k ~  
 BOOL bAdded=FALSE; " 8MF_Gu):  
 for(int index=0;index<MAX_KEY;index++){ 7$=In K  
  if(hCallWnd[index]==0){ KpGhQdR#  
   hCallWnd[index]=hWnd; ?`ZU R& 20  
   HotKey[index]=cKey; =,8]nwgo  
   HotKeyMask[index]=cMask; HV|,}Wks6s  
   bAdded=TRUE; r19 pZAc  
   KeyCount++; Otuf] B^s  
   break; S\=Nn7"  
  } H <l7ZS:  
 } a=2%4Wmz  
 return bAdded; ##*3bDf$-5  
} R 9\*#c  
+<C!U'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K%oG,-wdg  
{ D,feF9  
 BOOL bRemoved=FALSE; ?tbrbkx  
 for(int index=0;index<MAX_KEY;index++){ wHy!CP%  
  if(hCallWnd[index]==hWnd){ fZF@k5*\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ICQKP1WFp  
    hCallWnd[index]=NULL; .q>iXE_c  
    HotKey[index]=0; $& td=OK  
    HotKeyMask[index]=0; +e``OeXog  
    bRemoved=TRUE; L,!?Nt\  
    KeyCount--; GTd,n=  
    break; #6=  
   } (<9u-HF#  
  } ]=BB#  
 } [W&T(%(W-  
 return bRemoved; S9.o/mr  
} 77Dn97l)&  
hgq;`_;1,  
void VerifyWindow() ZECfR>`x  
{ e^voW"?%  
 for(int i=0;i<MAX_KEY;i++){ hVY$;s  
  if(hCallWnd!=NULL){ k_#)Tw*  
   if(!IsWindow(hCallWnd)){ <P_-s*b  
    hCallWnd=NULL; WyiQoN'q  
    HotKey=0; |6- nbj  
    HotKeyMask=0; 2>%=U~5  
    KeyCount--; HRA|q  
   } x%B%f`]8  
  } GbI/4<)l}  
 } a7opCmL  
} {l@{FUv  
^cWnF0)j.  
BOOL CHookApp::InitInstance() oB7_O-3z  
{ _[BP 0\dPW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \FaP|28h  
 hins=AfxGetInstanceHandle(); :2`e(+Uz  
 InitHotkey(); ,P0) 6>  
 return CWinApp::InitInstance(); 8s@3hXD&  
} >t+P(*u  
nw<uyaU-t  
int CHookApp::ExitInstance() [a(#1  
{ xmoxZW:  
 VerifyWindow(); :3 mh@[V  
 UnInit(); +}AI@+  
 return CWinApp::ExitInstance(); "AqB$^S9t  
} 8oGRLYU N  
2 %]X+`+O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AbM'3Mkz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HoAy_7-5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2=}FBA,2  
#if _MSC_VER > 1000 [-w%/D%@  
#pragma once y~V(aih}D  
#endif // _MSC_VER > 1000 .xkM.g4{~  
BgT*icd8d  
class CCaptureDlg : public CDialog c71y'hnT  
{ !4!~L k=  
 // Construction  bN.Pex  
 public: -{vD: Il=6  
  BOOL bTray; kJR`:J3DJ  
  BOOL bRegistered; 2~V*5~fb  
  BOOL RegisterHotkey(); lB4WKn=?Kl  
  UCHAR cKey; 6S #Cl>v  
  UCHAR cMask; 7yQ4*UB  
  void DeleteIcon(); Lw,h+@0  
  void AddIcon();  M6TD"-  
  UINT nCount; /-s6<e!  
  void SaveBmp(); |s_GlJV.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor DmcZta8n]  
  // Dialog Data 1Y,Z %d  
  //{{AFX_DATA(CCaptureDlg) kx^/*~ex  
  enum { IDD = IDD_CAPTURE_DIALOG }; K=&>t6s<  
  CComboBox m_Key; !)$Zp\Sg  
  BOOL m_bControl; XWw804ir  
  BOOL m_bAlt; Zd+bx*rD  
  BOOL m_bShift; (@YG~ 0  
  CString m_Path; %TqC/c  
  CString m_Number; b.938#3,  
  //}}AFX_DATA <UCl@5g&  
  // ClassWizard generated virtual function overrides /wG2vE8e  
  //{{AFX_VIRTUAL(CCaptureDlg) '+ ?X  
 public: +7}]E1Uf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j<$2hiI/?&  
 protected: l,).p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HaYo!.(Fv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;*J  
  //}}AFX_VIRTUAL /L 3:  
  // Implementation B5QFK  
 protected: 5V-I1B&  
  HICON m_hIcon; wIgS3K  
  // Generated message map functions Bw.i}3UT6  
  //{{AFX_MSG(CCaptureDlg) 4p wH>1  
  virtual BOOL OnInitDialog(); 73-p*o(pt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q(w(Sd)#L  
  afx_msg void OnPaint(); X>^fEQq"  
  afx_msg HCURSOR OnQueryDragIcon(); "N#Y gSr  
  virtual void OnCancel(); 8Fub<UhJ  
  afx_msg void OnAbout(); Dv6}bx(  
  afx_msg void OnBrowse(); Y:`&=wjP~  
  afx_msg void OnChange(); wC*X4 '  
 //}}AFX_MSG i/.6>4tE:  
 DECLARE_MESSAGE_MAP() lq uLT6]  
}; A}!J$V:w]  
#endif 9BB=YnKE  
HOi`$vX }N  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file P<-@h1p,  
#include "stdafx.h" TA\vZGJ('  
#include "Capture.h" A@'OJRc  
#include "CaptureDlg.h" $~kA B8z  
#include <windowsx.h> W*G<X.Hf  
#pragma comment(lib,"hook.lib") {`_i`  
#ifdef _DEBUG + T+#q@  
#define new DEBUG_NEW \.S/|  
#undef THIS_FILE $;PMkUE  
static char THIS_FILE[] = __FILE__; \<K5ZIWV  
#endif zm#  ?W  
#define IDM_SHELL WM_USER+1 iow"n$/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4Tc~b3\!Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )%]J>&/0J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3' 'me  
class CAboutDlg : public CDialog IGgL7^MF  
{ ,: ^u-b|  
 public: {{1G`;|v 9  
  CAboutDlg(); *^r}"in  
  // Dialog Data o;*Q}Gr<M  
  //{{AFX_DATA(CAboutDlg) fV~~J2IK  
  enum { IDD = IDD_ABOUTBOX }; C,zohlpC  
  //}}AFX_DATA )B*t :tN  
  // ClassWizard generated virtual function overrides (?];VG  
  //{{AFX_VIRTUAL(CAboutDlg) mZBo~(}  
 protected: ig"L\ C"T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tX[WH\(xI  
  //}}AFX_VIRTUAL bd`P0f?  
  // Implementation 9JwPSAo;  
 protected: T4F/w|Q  
  //{{AFX_MSG(CAboutDlg) T>>c2$ x  
  //}}AFX_MSG u:b=\T L  
  DECLARE_MESSAGE_MAP() p}P-6&k,U  
}; #z42C?V  
cb bFw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d5-qZ{W  
{ r<\u6jF  
 //{{AFX_DATA_INIT(CAboutDlg) }2oc#0  
 //}}AFX_DATA_INIT SWLo|)@[/  
} /@5YW"1  
13f)&#, F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )}v l\7=  
{ P {'b:C  
 CDialog::DoDataExchange(pDX); 2zpr~cB=  
 //{{AFX_DATA_MAP(CAboutDlg) DwF hK*  
 //}}AFX_DATA_MAP @|!z9Y*  
} <N @Gu!N8  
f mGc^d|=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QL*IiFR  
 //{{AFX_MSG_MAP(CAboutDlg) vSh`&w^*  
 // No message handlers ?ubro0F:  
 //}}AFX_MSG_MAP 5-M-X#(  
END_MESSAGE_MAP() AwN!;t_0+N  
s^SJY{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]^]wP]R_  
: CDialog(CCaptureDlg::IDD, pParent) kVL.PY\K  
{ }WV:erg`  
 //{{AFX_DATA_INIT(CCaptureDlg) pk~WrqK}  
  m_bControl = FALSE; M=Wz  
  m_bAlt = FALSE; )e{}V\;q  
  m_bShift = FALSE; QW"! (`K  
  m_Path = _T("c:\\"); Pz^544\~ou  
  m_Number = _T("0 picture captured."); 4P0}+  
  nCount=0; 11lsf/IP  
  bRegistered=FALSE; D{!IW!w  
  bTray=FALSE; xC?h2hIt  
 //}}AFX_DATA_INIT <Gsu Z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &{i{XcqH'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NVs@S-rpX  
} |hQ;l|SWg  
 _4f;<FL  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W9)&!&<o  
{ 9FX-1,Jx  
 CDialog::DoDataExchange(pDX); H.0K?N&\?>  
 //{{AFX_DATA_MAP(CCaptureDlg) svSVG:48  
  DDX_Control(pDX, IDC_KEY, m_Key); E'8;10s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bZ6+,J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g78^9Y*1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E.f%H(b  
  DDX_Text(pDX, IDC_PATH, m_Path);  3CJwj  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,vDbp?)'U  
 //}}AFX_DATA_MAP s@C}P  
} `{Ul!  
1Z;iV<d  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ctUp=po  
//{{AFX_MSG_MAP(CCaptureDlg) YzWz|  
 ON_WM_SYSCOMMAND() #Dac~>a'  
 ON_WM_PAINT() *h|U,T7ew  
 ON_WM_QUERYDRAGICON() N;gfbh]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;\]@K6m/Ap  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *`U~?q}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0aAoV0fMDz  
//}}AFX_MSG_MAP 2?x4vI np;  
END_MESSAGE_MAP() BuwY3F\-O  
Xeaj xcop#  
BOOL CCaptureDlg::OnInitDialog() 4R*,VR.K  
{ F5Va+z,jg  
 CDialog::OnInitDialog(); +qoRP2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); b]y2+A.n  
 ASSERT(IDM_ABOUTBOX < 0xF000); _j3fAr(V  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |{8Pb3#U  
 if (pSysMenu != NULL) 626r^c=  
 { rGO8!X 3d  
  CString strAboutMenu; Lv%x81]K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 26nx`w?j(  
  if (!strAboutMenu.IsEmpty()) $C\BcKlmv  
  { HP =+<]?{G  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5m*,8]!-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c|%6e(g"L  
  } ^s=8!=A(  
 } `9 L>*  
 SetIcon(m_hIcon, TRUE); // Set big icon PM+[,H  
 SetIcon(m_hIcon, FALSE); // Set small icon =}*0-\QG  
 m_Key.SetCurSel(0); <q SC#[xu  
 RegisterHotkey(); OY d !v`<  
 CMenu* pMenu=GetSystemMenu(FALSE);  `]X>V,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kFB  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vbNBLCwug  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2|L&DF:G  
 return TRUE; // return TRUE unless you set the focus to a control Y 7aqO5  
} /NlGFO*Z  
yw!{MO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2?5>o!C  
{ q@qsp&0/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "#]$r  
 { :0ep( <|;  
  CAboutDlg dlgAbout; OnK4] S5  
  dlgAbout.DoModal(); ]A"h&`Cvt  
 } ;]iRk  
 else -%~4W?  
 { M{\I8oOg  
  CDialog::OnSysCommand(nID, lParam); q@&6#B  
 } R@0R`Zs  
} p[-O( 3Y  
Jv i#)  
void CCaptureDlg::OnPaint() rZF*q2?  
{ :t[_:3@  
 if (IsIconic()) ~BF&rx5Q  
 { j6YOKJX  
  CPaintDC dc(this); // device context for painting ;,TFr}p`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P3%5?.S  
  // Center icon in client rectangle Kgv T"s.  
  int cxIcon = GetSystemMetrics(SM_CXICON); %;/P&d/  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?(PKeq6  
  CRect rect; nu^436MSOa  
  GetClientRect(&rect); ]yu:i-SfP  
  int x = (rect.Width() - cxIcon + 1) / 2; G6/m#  
  int y = (rect.Height() - cyIcon + 1) / 2; >0gW4!7Y  
  // Draw the icon pJ=#zsE0  
  dc.DrawIcon(x, y, m_hIcon); } #J/fa9 !  
 } J05e#-)<K  
 else !W\+#ez  
 { 2T1q?L?]  
  CDialog::OnPaint(); (mOtU8e  
 } =vPj%oLp'a  
} lk!@?  
=-T]3!   
HCURSOR CCaptureDlg::OnQueryDragIcon() fox6)Uot  
{ l.]xB,k  
 return (HCURSOR) m_hIcon; h 0|s  
} L-Lvp%%  
>usL*b0%  
void CCaptureDlg::OnCancel() =v\.h=~~  
{ LscGTs,  
 if(bTray) G B^Br6  
  DeleteIcon(); 9$Y=orpWxr  
  CDialog::OnCancel(); 83m3OD_y  
} ~>G^=0LT  
9^x> 3Bo  
void CCaptureDlg::OnAbout() UBs4K*h|  
{ QnDg 6m)+  
 CAboutDlg dlg; i@q&5;%%  
 dlg.DoModal(); =*Lfl'sr_  
} . me;.,$#  
.X&9Q9T=#  
void CCaptureDlg::OnBrowse() ^pS~Z~[d/  
{ jo7\`#(Q  
 CString str; t:S+%u U  
 BROWSEINFO bi; gr{ DWCK  
 char name[MAX_PATH]; z{543~Og59  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ni<(K 0~  
 bi.hwndOwner=GetSafeHwnd(); ~,Qp^"rlW  
 bi.pszDisplayName=name; YR70BOxK  
 bi.lpszTitle="Select folder"; >_TZ'FT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Om<a<q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); rA1._   
 if(idl==NULL) "7 yD0T)2  
  return; sT.ss$HY9,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TvM~y\s  
 str.ReleaseBuffer(); 2eogY#  
 m_Path=str; [Pp'Ye~K@c  
 if(str.GetAt(str.GetLength()-1)!='\\') k+ /6$pI  
  m_Path+="\\"; y7{?Ip4[  
 UpdateData(FALSE); IBGrt^$M  
} @iiT<  
hoP]9&<T  
void CCaptureDlg::SaveBmp() W)/#0*7  
{ 5G#n"}T  
 CDC dc; ("@!>|H  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); } \f0 A-  
 CBitmap bm; Mt$ *a  
 int Width=GetSystemMetrics(SM_CXSCREEN); B?QIN]  
 int Height=GetSystemMetrics(SM_CYSCREEN); s.rm7r@ #  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b>W %t  
 CDC tdc; R_KH"`q  
 tdc.CreateCompatibleDC(&dc); $qiya[&G4  
 CBitmap*pOld=tdc.SelectObject(&bm); 9sP0D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #tHK"20  
 tdc.SelectObject(pOld); c L]1f  
 BITMAP btm; ~u{uZ(~  
 bm.GetBitmap(&btm); SM '|+ d  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0K+ne0I  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1 zZlC#V  
 BITMAPINFOHEADER bih; ]5O~+Nf  
 bih.biBitCount=btm.bmBitsPixel; =]t|];c%  
 bih.biClrImportant=0; 0b>h$OU/  
 bih.biClrUsed=0; Xvv6~  
 bih.biCompression=0; =l6mL+C  
 bih.biHeight=btm.bmHeight; #E?4E1bnB  
 bih.biPlanes=1; %>yL1BeA4  
 bih.biSize=sizeof(BITMAPINFOHEADER); #WuBL_nZ~  
 bih.biSizeImage=size; `uFdwO'DD  
 bih.biWidth=btm.bmWidth; {ax:RUQxy  
 bih.biXPelsPerMeter=0; wJ]d&::@h  
 bih.biYPelsPerMeter=0; oDR%\VY6T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E./2jCwI(Y  
 static int filecount=0; :/#rZPPF  
 CString name; > I?IPQB  
 name.Format("pict%04d.bmp",filecount++); 8}[).d160  
 name=m_Path+name; XX@ZQcN  
 BITMAPFILEHEADER bfh; dG{A~Z z  
 bfh.bfReserved1=bfh.bfReserved2=0;  g-A-kqo9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r$1Qf}J3=  
 bfh.bfSize=54+size; |>Vb9:q9Po  
 bfh.bfOffBits=54; ok[i<zl; '  
 CFile bf; 97]E1j]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <} .$l  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "g|#B4'e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w(/S?d  
  bf.WriteHuge(lpData,size); AdEMa}u 6  
  bf.Close(); 2iOV/=+  
  nCount++; Z r8*et  
 } 3mgD(,(^  
 GlobalFreePtr(lpData); = &]L00u.  
 if(nCount==1) ^c<Ve'-  
  m_Number.Format("%d picture captured.",nCount); 2HdC |$_+  
 else b sX[UF  
  m_Number.Format("%d pictures captured.",nCount); A<{{iBEI`  
  UpdateData(FALSE); d~H`CrQE*  
} 8r{.jFGv  
*g%yRU{N  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %A`+WYeuX  
{ t!XwW$@  
 if(pMsg -> message == WM_KEYDOWN) vt8By@]:  
 { ]`K2 N  
  if(pMsg -> wParam == VK_ESCAPE) vgPCQO([  
   return TRUE; sT)CxOV  
  if(pMsg -> wParam == VK_RETURN) m@c)Xci  
   return TRUE; rH-23S  
 } NOva'qk  
 return CDialog::PreTranslateMessage(pMsg); %Zi} MPx  
} $I=~S[p  
WE?5ehEme  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]/Pn EU[  
{ fex@,I&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3n _htgcv  
  SaveBmp(); siI;"?  
  return FALSE; {.yB'.k?  
} {mg2pfhB!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M  >u_4AY  
 CMenu pop; QV!up^Zso  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2ESo2  
 CMenu*pMenu=pop.GetSubMenu(0); ^sw?gH*  
 pMenu->SetDefaultItem(ID_EXITICON); Ew N}l  
 CPoint pt; aOp\91  
 GetCursorPos(&pt); wT@og|M  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); icgfB-1|i  
 if(id==ID_EXITICON) l **X^+=$  
  DeleteIcon(); t_^4`dW`  
 else if(id==ID_EXIT) )pa]ui\t  
  OnCancel(); 1#x0q:6  
 return FALSE; F%|h;+5  
} mt .sucT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }7Uoh(d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lN@o2QX  
 AddIcon(); ^c|/*u  
 return res; .nJz G  
} :X=hQ:>P  
>7|VR:U?B  
void CCaptureDlg::AddIcon() Ac@VGT:9  
{ *w&e\i|7  
 NOTIFYICONDATA data; x:Y1P:  
 data.cbSize=sizeof(NOTIFYICONDATA); 7! Nsm  
 CString tip; It(_v  
 tip.LoadString(IDS_ICONTIP); #"!<W0  
 data.hIcon=GetIcon(0); TH;hO).u  
 data.hWnd=GetSafeHwnd(); M]^5s;y  
 strcpy(data.szTip,tip); F8=+j_UGI  
 data.uCallbackMessage=IDM_SHELL; By |4 m  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .Mbz3;i0  
 data.uID=98; l#o ~W`  
 Shell_NotifyIcon(NIM_ADD,&data); .A|udZ,  
 ShowWindow(SW_HIDE); )5, v!X)  
 bTray=TRUE; <)9y{J}s:  
} ]Ze1s02(  
\e*]Ls#jS  
void CCaptureDlg::DeleteIcon() 0kh6@y3  
{ M%HU4pTW#o  
 NOTIFYICONDATA data; q~3>R=t  
 data.cbSize=sizeof(NOTIFYICONDATA); ye&;(30Oq  
 data.hWnd=GetSafeHwnd(); G{}VPcrbC  
 data.uID=98; jA1 +x:Wq  
 Shell_NotifyIcon(NIM_DELETE,&data); -n 1 v3  
 ShowWindow(SW_SHOW); P:c w|Q  
 SetForegroundWindow(); M3\AY30L  
 ShowWindow(SW_SHOWNORMAL); 79gT+~z   
 bTray=FALSE; /m1\iM\  
} zX[U~.  
';CNGv -  
void CCaptureDlg::OnChange() 0mE 0 j  
{ pBHRa?Y5  
 RegisterHotkey(); x5Bk/e'  
} 3og.y+.=U.  
ZK,G v  
BOOL CCaptureDlg::RegisterHotkey() 6P3*Z  
{ oJ^P(]dw  
 UpdateData(); X ?O[r3<  
 UCHAR mask=0; K;?+8(H  
 UCHAR key=0; V[LglPt  
 if(m_bControl) VA%J\T|G2\  
  mask|=4; I7onX,U+  
 if(m_bAlt)  B,@i  
  mask|=2; (PL UFT  
 if(m_bShift) m O_af  
  mask|=1; cuX)8+  
  key=Key_Table[m_Key.GetCurSel()]; ch]IzdD  
 if(bRegistered){ #a#F,ZT  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KlEpzJ98  
  bRegistered=FALSE; 7CysfBF0g  
 } :WEDAFq0  
 cMask=mask; C|bET  
 cKey=key; >4TO=i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i-1op> Y  
 return bRegistered; %{W6PrY{  
} 1 MFbQs^  
- ).C  
  四、小结 =X}J6|>X  
.-zom~N-?  
  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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