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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: vF72#BNs  
  ~>u .d  
  一、实现方法 $V~@w.-Z#  
V b0T)C  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ]fyfL|(;  
={BD*= i  
#pragma data_seg("shareddata") $L/`nd  
HHOOK hHook =NULL; //钩子句柄 "=h1gql'  
UINT nHookCount =0; //挂接的程序数目 Xg)8}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KkJqqO"EL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P?0X az  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <Ky-3:pxeM  
static int KeyCount =0; At Wv9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Z vysLHj  
#pragma data_seg() a|ufm^ F  
4E$MhP  
  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。 1!#N-^qk  
`Q@7,z=f  
  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: M(-)\~9T  
&uq.k{<p\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &K^0PzWWof  
cKey,UCHAR cMask) UC!mp?   
{ !_Lmrs  
 BOOL bAdded=FALSE; RZa/la*  
 for(int index=0;index<MAX_KEY;index++){ [|(|"dh@^H  
  if(hCallWnd[index]==0){ mQ[$U  
   hCallWnd[index]=hWnd; R N$vKJk  
   HotKey[index]=cKey; ,B <\a  
   HotKeyMask[index]=cMask; (5yM%H8:  
   bAdded=TRUE; :/5m D  
   KeyCount++; pjeNBSu6  
   break; sZ `Tv[  
  } n$i X6Cd  
 } =?i?-6M  
 return bAdded; &W<7!U:2m  
} #ArrQeO 5_  
//删除热键 T+Oqd\05.+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d ^bSV4  
{ HbTVuf o  
 BOOL bRemoved=FALSE; fM= o?w6v  
 for(int index=0;index<MAX_KEY;index++){ M xE]EJZ  
  if(hCallWnd[index]==hWnd){ D!j/a!MaKk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xl}rdnf}  
    hCallWnd[index]=NULL; S=@+qcI  
    HotKey[index]=0; cx\"r  
    HotKeyMask[index]=0; .;? Bni  
    bRemoved=TRUE; 1Bytu >2  
    KeyCount--; A  6(`  
    break; e" v%m 'G  
   } ~A0]vcP  
  } :'%6  
 } 5!c/J:z  
 return bRemoved; v">?`8V  
} 1T^WMn:U  
-U|c~Cqc  
-]N2V'QB  
  DLL中的钩子函数如下: I Xc `Ec  
0z8(9DlTc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) RXgb/VR  
{ 2#wnJdr6E  
 BOOL bProcessed=FALSE; 'xW=qboOp  
 if(HC_ACTION==nCode) E_,/)U8  
 { *^?tr?e%I<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .LzA'q1+z  
   switch(wParam) te@m#` p9  
   {  `PWKA;W$0  
    case VK_MENU: yV^Yp=f_  
     MaskBits&=~ALTBIT; 4]d^L>  
     break; IwyA4Ak Ru  
    case VK_CONTROL: b?~p/[  
     MaskBits&=~CTRLBIT; rj4@  
     break; (Y1*Bs[l  
    case VK_SHIFT: bWFa{W5!  
     MaskBits&=~SHIFTBIT; ?ANW I8'_j  
     break; ~f<'] zXv  
    default: //judge the key and send message sY ]J!"  
     break; 2yN!yIPR  
   } 15:9JVH3D  
   for(int index=0;index<MAX_KEY;index++){ !0{SVsc)  
    if(hCallWnd[index]==NULL) ]kj^T?&n.  
     continue; XC<fNK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >"W^|2R  
    { /}:{(Go  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P{Nvt/%  
     bProcessed=TRUE; >y%H2][  
    } g~U( w  
   } T KZtoQP%  
  } TOG:`FID  
  else if((lParam&0xc000ffff)==1){ //有键按下 *xnZTj:  
   switch(wParam) N[{rsUBd  
   { F`D$bE;|  
    case VK_MENU: h:Pfiw]  
     MaskBits|=ALTBIT; T3 w%y`K  
     break; *C*J1JYp+  
    case VK_CONTROL: DB}Uzw|  
     MaskBits|=CTRLBIT; y0%@^^-Ru  
     break; } z'Jsy[s  
    case VK_SHIFT: De$~ *2  
     MaskBits|=SHIFTBIT; |$WHw*F^  
     break; 9*"  
    default: //judge the key and send message 1?'4%>kp  
     break; (UkP AE  
   } pqG> |#RG  
   for(int index=0;index<MAX_KEY;index++){ hh;kBv07o  
    if(hCallWnd[index]==NULL) )5|9EXh  
     continue; u>>|ZPe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3vrVX<_  
    { **q8vhJM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0]d;)_`@  
     bProcessed=TRUE; [YvS#M3T  
    } kowS| c#  
   } a;o0#I#Si  
  } E,i^rAm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4$-R|@,|_  
   for(int index=0;index<MAX_KEY;index++){ I;4quFBlMu  
    if(hCallWnd[index]==NULL) gawY{Jr8I  
     continue; ( 5LCy?-6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P1F-Wy1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V^7.@BeT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 PT>b%7Of  
   } @A[)\E1  
  } f&-`+V}U  
 } 1]xmOx[mb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1W|jC   
} d1~#@6CIz  
p6JTNx D  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: g->*@%?<w>  
Nl\`xl6y]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f_k'@e{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [-(^>Y  
^G4YvS(  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: TQR5V\{&%  
CJ<nUIy'z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ay8]"sa  
{ cAR `{%b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) MlV(XG>'  
 { .n\JY;"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b9H(w%7ucU  
  SaveBmp(); :8 2T!  
  return FALSE; #:6-O  
 } .}__XWK5  
 …… //其它处理及默认处理 CW1l;uwtU  
} UyGo0POW  
45~x #Q  
+C% 6jGGh  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 & bTCTDZh  
n Bm ]?  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 dGZie .Zx  
o2fih%p?1  
  二、编程步骤 }aWy#Oe  
a>j}@8[J  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]B/> =t"E  
(?zg.y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u^MKqI  
p]aEC+q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; J3yK^@&&  
f:-)S8OJ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; sH6;__e  
(.-4Jn  
  5、 添加代码,编译运行程序。 :jTSO d[r  
O84]J:b  
三、程序代码 ^Iw$ (  
j\C6k  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _=g&^_ #t  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 'lIs`Zc5N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8lQ}-8  
#if _MSC_VER > 1000 5 kHaZ Q  
#pragma once 217G[YE-  
#endif // _MSC_VER > 1000 7uR;S:WX  
#ifndef __AFXWIN_H__ Y j oe|  
#error include 'stdafx.h' before including this file for PCH CX]1I|T5  
#endif rXB;#ypO  
#include "resource.h" // main symbols qvn.uujYS  
class CHookApp : public CWinApp :^7w  
{ ZvRa"j  
 public: ^s)`UZ<C=  
  CHookApp(); W9SU1{*9  
  // Overrides 0? {ADQz  
  // ClassWizard generated virtual function overrides ;21D^e  
  //{{AFX_VIRTUAL(CHookApp) ytttF5-  
 public: FWbp;v{  
  virtual BOOL InitInstance(); Z6I|Y5#H  
  virtual int ExitInstance(); $zP5Hzx  
  //}}AFX_VIRTUAL )Do 0  
  //{{AFX_MSG(CHookApp) U[wx){[|  
  // NOTE - the ClassWizard will add and remove member functions here. bq/Aopfr  
  // DO NOT EDIT what you see in these blocks of generated code ! kj6:P$tH  
  //}}AFX_MSG ~0MpB~ {xd  
  DECLARE_MESSAGE_MAP() =E9\fRGU  
}; j_JY[sex  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); z0[@O)Sj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ggD T5hb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bRvGetX  
BOOL InitHotkey(); =:rg1wo"c  
BOOL UnInit(); $tZ {>!N  
#endif 8lusKww  
SAP/jD$5]>  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. N{%7OG  
#include "stdafx.h" V k{;g  
#include "hook.h" zYzV!s2^  
#include <windowsx.h> P j   
#ifdef _DEBUG C|ZPnm>f30  
#define new DEBUG_NEW G)am ng/  
#undef THIS_FILE wn"}<ka  
static char THIS_FILE[] = __FILE__; "BQnP9  
#endif Z- feMM  
#define MAX_KEY 100 C8m9H8Qm  
#define CTRLBIT 0x04 b,'O|s]"Sc  
#define ALTBIT 0x02 I}PI  
#define SHIFTBIT 0x01 6H|1IrG  
#pragma data_seg("shareddata") 9q'&tU'a=c  
HHOOK hHook =NULL; v#,queGi  
UINT nHookCount =0; i$NlS}W  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (d_z\U7l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT / l$enexSt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /DAR'9@h  
static int KeyCount =0; ,@ '^3u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G*9(O:  
#pragma data_seg() ! I:N<  
HINSTANCE hins; kX8C'D4 gX  
void VerifyWindow(); ZJ3g,dc  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hl1IG !  
//{{AFX_MSG_MAP(CHookApp) E@GYl85fI  
// NOTE - the ClassWizard will add and remove mapping macros here. /2p*uv }IP  
// DO NOT EDIT what you see in these blocks of generated code! &N^j }^ Z  
//}}AFX_MSG_MAP = wz}yfdrC  
END_MESSAGE_MAP() g~DuK|+  
|.k'?!  
CHookApp::CHookApp() g*YDgY  
{ <K0epED  
 // TODO: add construction code here, ?c#s}IH  
 // Place all significant initialization in InitInstance `w!XO$"]Z  
} c5ij2X|I  
u`'" =Y_E  
CHookApp theApp; E0ED[d,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^8 VW$}  
{ WE\TUENac(  
 BOOL bProcessed=FALSE; I[?\ Or  
 if(HC_ACTION==nCode) X.b8qbnq[  
 { =v:?rY}  
  if((lParam&0xc0000000)==0xc0000000){// Key up CXq[VYM&X  
   switch(wParam) 81Z;hO"~  
   { >ai,6!  
    case VK_MENU: *L^W[o  
     MaskBits&=~ALTBIT; L$5,RUy  
     break; x?L[*N_ml  
    case VK_CONTROL: FJ3S  
     MaskBits&=~CTRLBIT; eIvZhi  
     break; phy}Hk/  
    case VK_SHIFT: +[G9PP6  
     MaskBits&=~SHIFTBIT; qHk{5O3  
     break; zM0}(5$m  
    default: //judge the key and send message sT?{  
     break; W\l&wR  
   } YYQvt  
   for(int index=0;index<MAX_KEY;index++){ F{x+1hct0  
    if(hCallWnd[index]==NULL) gKh*q.  
     continue; cQEUHhRg!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FI^Wh7J  
    { FOF@@C~aH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Lap?L/NS  
     bProcessed=TRUE; %Y&48''"  
    } M/ 64`lcb  
   } S)U*1t7[  
  } kp*v:*  
  else if((lParam&0xc000ffff)==1){ //Key down I# tlaz#  
   switch(wParam) CzBYH   
   {  ;+~5XLk  
    case VK_MENU: O h@z<1eYZ  
     MaskBits|=ALTBIT; h`6 (Oo|  
     break; u IXA{89  
    case VK_CONTROL: <q7o"NI6FZ  
     MaskBits|=CTRLBIT; T]\1gs41  
     break; <H^jbK  
    case VK_SHIFT: GlJ[rD  
     MaskBits|=SHIFTBIT; ^("b~-cJ  
     break; ~uhW~bT  
    default: //judge the key and send message AMyg>n!  
     break; 33~MP;  
   } >` s"C  
   for(int index=0;index<MAX_KEY;index++) s*PKr6X+  
   { <1*kXTN(  
    if(hCallWnd[index]==NULL) T f3CyH!k  
     continue; =f~<*wQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aBC5?V*e%  
    { CQ2vFg3+o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RZHfT0*jL  
     bProcessed=TRUE; {.LJ(|(Mz  
    } RL}?.'!  
   } 5len} ){  
  } )^(gwE  
  if(!bProcessed){ *tv&=  
   for(int index=0;index<MAX_KEY;index++){ K+~?yOQj  
    if(hCallWnd[index]==NULL) FxlH;'+Q  
     continue; M8-8 T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2G8w&dtu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sTd@/>S?p  
   } t~L4wr{B  
  } sRt7.fe  
 } TJv .T2|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tl_3 %$s  
} @g#5d|U);  
+QN4hJK  
BOOL InitHotkey() c+ZOC8R  
{ s",Ea*  
 if(hHook!=NULL){ Fn5BWV  
  nHookCount++; ^=x/:0  
  return TRUE; ;n't:yQW  
 } i "V.$|,  
 else d}O\:\}y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2WS*c7Ct  
  if(hHook!=NULL) ZQlk 5  
   nHookCount++; 6)1PDlB  
  return (hHook!=NULL); Q>$B.z  
} OkC.e')Vx  
BOOL UnInit() E7O3$B8  
{ fnX[R2KZ  
 if(nHookCount>1){ $2W#'_K+  
  nHookCount--; syr0|K[  
  return TRUE; 6'r;6T *  
 } {]6-,/3UR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -Mr_Ao`E  
 if(unhooked==TRUE){ eQi^d/yi  
  nHookCount=0; !\#Wq{p>W*  
  hHook=NULL; K^!#;,0  
 } $]LS!@ Rm  
 return unhooked; 0m3hL~0(a  
} $T K*w8@:  
z6w'XA1_+t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bhD-;Y!6;  
{ !Q"L)%)'A  
 BOOL bAdded=FALSE; L ,R}l0kc  
 for(int index=0;index<MAX_KEY;index++){ 6 ZRc|ZQ  
  if(hCallWnd[index]==0){ hj1;f<' U  
   hCallWnd[index]=hWnd; dCo)en  
   HotKey[index]=cKey; UnDCC_ud  
   HotKeyMask[index]=cMask; p l^;'|=M  
   bAdded=TRUE; :WRD<D_4  
   KeyCount++; uzxwJs'fz  
   break; = 9Yf o,F  
  } fuj9x;8X0  
 } VKPEoy8H  
 return bAdded; wa,`BAKJ+F  
} 3u j|jwL  
S }`f&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f2c <-}wR  
{ .QP`Qn6(P  
 BOOL bRemoved=FALSE; Y-})/zFc  
 for(int index=0;index<MAX_KEY;index++){ ~2>Adp  
  if(hCallWnd[index]==hWnd){ P DY :?/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pmP~1=3  
    hCallWnd[index]=NULL; _Yo)m |RaB  
    HotKey[index]=0; s=)W  
    HotKeyMask[index]=0; qcO~}MJr}^  
    bRemoved=TRUE; 5 Y&`ZJ  
    KeyCount--; \SmsS^z(]  
    break; WT\wV\Pu  
   } mW]dhY 3X  
  } X_'tgP9  
 } 6{;6~?U  
 return bRemoved; 2 K_ QZ  
} ;#zteqn  
4Yvz-aSyO  
void VerifyWindow() c9c]1XJ  
{ K^o$uUBe  
 for(int i=0;i<MAX_KEY;i++){ IwYfs]-  
  if(hCallWnd!=NULL){ 2@bOy~$A  
   if(!IsWindow(hCallWnd)){ J t.<Z&  
    hCallWnd=NULL; 8{0XqE~ix=  
    HotKey=0; SOG(&)b  
    HotKeyMask=0; (_#E17U)_  
    KeyCount--; ^;/~$  
   } !Fs$W  
  } nY MtK  
 } ]a.e;c-  
} d s`YVXKH  
FrMXf,}  
BOOL CHookApp::InitInstance() T x Mh_  
{ 9Avj\G  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z5'^Hj1,  
 hins=AfxGetInstanceHandle(); a4uy}@9z  
 InitHotkey(); :V6 [_VaF  
 return CWinApp::InitInstance(); LS*L XC  
} _t,aPowX  
zW\a)~ E  
int CHookApp::ExitInstance() %H?B5y  
{ q/ :]+  
 VerifyWindow(); &p#PYs|H  
 UnInit(); .4ww5k>  
 return CWinApp::ExitInstance(); `~\SQ EY$  
} +h-% {  
d>#',C#;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file fwUvFK1G  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .]exY i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kj|Oj+&  
#if _MSC_VER > 1000 )j'Qi^;(D  
#pragma once )}$rgYKJ  
#endif // _MSC_VER > 1000 Ruq;:5u  
3KqRw (BK  
class CCaptureDlg : public CDialog i9 CQ~  
{ zdem}kBIe  
 // Construction @G]*]rkKb  
 public: 2Rys:$  
  BOOL bTray; enxb pq#  
  BOOL bRegistered; Wk^{Tn/]  
  BOOL RegisterHotkey(); B{0]v-w  
  UCHAR cKey; FnVW%fh  
  UCHAR cMask; B!<B7Q  
  void DeleteIcon(); |{|B70v3Co  
  void AddIcon(); R7b-/ !L  
  UINT nCount; Vxrj(knck,  
  void SaveBmp(); M&=SvM.f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7]So=% q  
  // Dialog Data LTBH/[q5  
  //{{AFX_DATA(CCaptureDlg) tMdSdJ8  
  enum { IDD = IDD_CAPTURE_DIALOG }; V1P]pP  
  CComboBox m_Key; ?$)a[UnqX  
  BOOL m_bControl; <9H3d7%  
  BOOL m_bAlt; D4"<suU|.  
  BOOL m_bShift; Otr=+i ZI  
  CString m_Path; :?EZ\WM7  
  CString m_Number; Lm!]m\LRZD  
  //}}AFX_DATA ox<6qW  
  // ClassWizard generated virtual function overrides C:&Sk\   
  //{{AFX_VIRTUAL(CCaptureDlg) &!;o[joG  
 public: >~7XBb08  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3;b)pQ~6CJ  
 protected: C&@'oLr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {88|J'*L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D',7T=C   
  //}}AFX_VIRTUAL yS K81`  
  // Implementation IW@xT@  
 protected: *:\[;69[  
  HICON m_hIcon; 6qQ_I 0f  
  // Generated message map functions \+Qd=,!i(  
  //{{AFX_MSG(CCaptureDlg) {8":c n j  
  virtual BOOL OnInitDialog(); .mwW`D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w&#[g9G%  
  afx_msg void OnPaint(); d8 ~%(I9  
  afx_msg HCURSOR OnQueryDragIcon(); D:K"J><@  
  virtual void OnCancel(); $EIKi'!8  
  afx_msg void OnAbout(); N:'GNMu  
  afx_msg void OnBrowse(); AzzHpfv,  
  afx_msg void OnChange(); M-;Mw Lx  
 //}}AFX_MSG Xa-TNnws?  
 DECLARE_MESSAGE_MAP() u1kCvi#N  
}; G]xYQ]  
#endif |$\1E+  
?$I9/r  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4TQmEM,  
#include "stdafx.h" Dg~m}La  
#include "Capture.h" Q<szH1-  
#include "CaptureDlg.h" ,d!@5d&Zi  
#include <windowsx.h> f"\klfrRI_  
#pragma comment(lib,"hook.lib") #v$wjqK5  
#ifdef _DEBUG -1$z=,q'  
#define new DEBUG_NEW }VWUcALJV  
#undef THIS_FILE ]ZR` 6|"VO  
static char THIS_FILE[] = __FILE__; c#u_%*  
#endif B(FM~TVZ  
#define IDM_SHELL WM_USER+1 <7T}b95  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;9#W#/B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O.Te"=^"F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 19% "F!^i  
class CAboutDlg : public CDialog r4K_Wp  
{ V"gKk$j7  
 public: E>#@ H  
  CAboutDlg(); ?|oN}y"i  
  // Dialog Data 1QhQ#`$<1  
  //{{AFX_DATA(CAboutDlg) ]p4?nT@]  
  enum { IDD = IDD_ABOUTBOX }; kwww5p ["  
  //}}AFX_DATA 8)s0$64Ra  
  // ClassWizard generated virtual function overrides Pdh`Gu1:3  
  //{{AFX_VIRTUAL(CAboutDlg) $B9?>a|{A  
 protected: WAuT`^"u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support c|'$3dB*  
  //}}AFX_VIRTUAL ,QA=)~;D  
  // Implementation KDf#e3  
 protected: v0!(&g 3Sd  
  //{{AFX_MSG(CAboutDlg) 5D-as9k*  
  //}}AFX_MSG *Vb#@O!  
  DECLARE_MESSAGE_MAP() eMEKR5*-O  
}; 1f"}]MbLR  
jL)Y'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5Uhxl^c  
{ 8.%wnH  
 //{{AFX_DATA_INIT(CAboutDlg) G.N `  
 //}}AFX_DATA_INIT f `b6E J  
} iz[IK%K  
W4#DeT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b{<$OVc  
{ AfZGI'%4[a  
 CDialog::DoDataExchange(pDX); \Lbwfd=  
 //{{AFX_DATA_MAP(CAboutDlg) grI#'x  
 //}}AFX_DATA_MAP ;K4=fHl  
} k ^KpQ&n  
j)nE!GKD(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Mj2Dat`p9  
 //{{AFX_MSG_MAP(CAboutDlg) gQ{<2u  
 // No message handlers EKw)\T1  
 //}}AFX_MSG_MAP aWvC-vZk  
END_MESSAGE_MAP() zLxuxf~4@  
[P6A $HC<  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BTO l`U  
: CDialog(CCaptureDlg::IDD, pParent) >pol'=  
{ cN2Pl%7  
 //{{AFX_DATA_INIT(CCaptureDlg) *Br }U  
  m_bControl = FALSE; { /8s`m  
  m_bAlt = FALSE; ~U]%>Zf  
  m_bShift = FALSE; ]A+t@/k  
  m_Path = _T("c:\\"); EronNtu8i  
  m_Number = _T("0 picture captured."); X=Y(,ZR(&  
  nCount=0; o8A8fHl  
  bRegistered=FALSE; ::GW  
  bTray=FALSE; -IDhK}C&T  
 //}}AFX_DATA_INIT B 'O1dRj&6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 WU/5i 8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7)>L#(N  
} wpNb/U  
p Zxx  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E+ XR[p  
{ 3fE0cVG*  
 CDialog::DoDataExchange(pDX); -EU=R_yg  
 //{{AFX_DATA_MAP(CCaptureDlg) y+7+({w<  
  DDX_Control(pDX, IDC_KEY, m_Key); R +U*]5~R  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); U(~Nmo'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,Cy&tRjR B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); m<;MOS  
  DDX_Text(pDX, IDC_PATH, m_Path); ulEtZ#O{_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3+ C;zDKa  
 //}}AFX_DATA_MAP VVuNU"-  
} f*m^x7  
I;<__  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) l4I',79l  
//{{AFX_MSG_MAP(CCaptureDlg) }`2+`w%uZ  
 ON_WM_SYSCOMMAND() 3EA_-?  
 ON_WM_PAINT() Oz xiT +  
 ON_WM_QUERYDRAGICON() Un+-  T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w8KxEV=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QY\'Uu{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `$JOFLa  
//}}AFX_MSG_MAP D-m%eP.  
END_MESSAGE_MAP() ePSD#kY5  
|\C.il7  
BOOL CCaptureDlg::OnInitDialog() ,W]}mqV%.'  
{ Sl \EPKZD  
 CDialog::OnInitDialog(); FELW?Q?k  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,&@FToR  
 ASSERT(IDM_ABOUTBOX < 0xF000); h,/3 }  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a94 nB  
 if (pSysMenu != NULL) ep l1xfr  
 { O "Aeg|  
  CString strAboutMenu; -O@/S9]S)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @}%kSn5y:  
  if (!strAboutMenu.IsEmpty()) Idj Z2)$  
  { OaByfo<S  
   pSysMenu->AppendMenu(MF_SEPARATOR); f8f|'v|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O`~L*h_  
  } S!iDPl~  
 } # ?u bvSdU  
 SetIcon(m_hIcon, TRUE); // Set big icon rdX;  
 SetIcon(m_hIcon, FALSE); // Set small icon o 7V&HJ[  
 m_Key.SetCurSel(0); 5["n] i  
 RegisterHotkey(); Z ]OX6G  
 CMenu* pMenu=GetSystemMenu(FALSE); 0h('@Hb.K#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4i29nq^n  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); y7z ,I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); LG?b]'#  
 return TRUE; // return TRUE unless you set the focus to a control bvJ*REPL ?  
} n*~#]%4  
v=IcVHuf  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h}+Gz={Q^  
{ I wu^@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |g\CS4$  
 { |c2;`T#`o  
  CAboutDlg dlgAbout; "nNT9 K|  
  dlgAbout.DoModal(); (d[JMO^@8  
 } ?J"Y4,{  
 else `K2vG`c  
 { fKs3H?|  
  CDialog::OnSysCommand(nID, lParam); uBaGOW|Pl  
 } grDz7\i:  
} z-nV!#  
En8L1$_  
void CCaptureDlg::OnPaint() JgldC[|7  
{ +J !1z  
 if (IsIconic()) D6P/39}W  
 { Z~"8C Kz  
  CPaintDC dc(this); // device context for painting 7P52r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7#g<fh  
  // Center icon in client rectangle O-+!KXHd[  
  int cxIcon = GetSystemMetrics(SM_CXICON); fa/p  
  int cyIcon = GetSystemMetrics(SM_CYICON); JNA_*3 '  
  CRect rect; ;|CG9|p  
  GetClientRect(&rect); ^687U,+  
  int x = (rect.Width() - cxIcon + 1) / 2; T zHR  
  int y = (rect.Height() - cyIcon + 1) / 2; oIKuo~  
  // Draw the icon kChCo0Q>1  
  dc.DrawIcon(x, y, m_hIcon); _<)HFg6  
 } =?hbi]  
 else H|cxy?iJ  
 { 1a#R7chl  
  CDialog::OnPaint(); ve*6WDK,H  
 } (`f)Tt=`  
} ( "J_< p  
{6wy}<ynC+  
HCURSOR CCaptureDlg::OnQueryDragIcon() W jBtL52  
{ w< |Lx#L}  
 return (HCURSOR) m_hIcon; *jy"g64j  
} j)jt&Gg'  
x=Ez hq]X  
void CCaptureDlg::OnCancel() K$ |!IXs  
{ ~A>-tn}O  
 if(bTray) M[&p[P@  
  DeleteIcon(); Nbm$ta  
  CDialog::OnCancel(); PE+{<[n  
} U9//m=_  
A~wyn5:_  
void CCaptureDlg::OnAbout() \H/}| ^+@  
{ ${7s"IX  
 CAboutDlg dlg; 71HrpTl1fw  
 dlg.DoModal(); RSF@Oo{  
} p,2H8I){  
9/5 EyV  
void CCaptureDlg::OnBrowse() m^a0JR}u9  
{ TfA;4 ^  
 CString str; &_Gu'A({J  
 BROWSEINFO bi;  #U/L8  
 char name[MAX_PATH]; |Lz7}g=6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .@f )#2  
 bi.hwndOwner=GetSafeHwnd(); "(E%JAwZ^W  
 bi.pszDisplayName=name; 2!Pwg0%2  
 bi.lpszTitle="Select folder"; 2{)<Df@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V5d|Lpm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /_/Z/D!  
 if(idl==NULL) Hd~fSXFl  
  return; <V4"+5cJ8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^|%7}=e  
 str.ReleaseBuffer(); ?*U:=|  
 m_Path=str; rj;~SC{  
 if(str.GetAt(str.GetLength()-1)!='\\') `AELe_  
  m_Path+="\\"; q%Lw#f  
 UpdateData(FALSE); M_F4I$V4  
} DOW Z hD  
Z , 98  
void CCaptureDlg::SaveBmp() :J6FI6  
{ }+ TA+;  
 CDC dc; uulzJbV,K  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); LQa1p  
 CBitmap bm; )0 i$Bo  
 int Width=GetSystemMetrics(SM_CXSCREEN); S >\\n^SbT  
 int Height=GetSystemMetrics(SM_CYSCREEN); a(+u"Kr z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i8(n(  
 CDC tdc; IS }U2d,W  
 tdc.CreateCompatibleDC(&dc); O:[@?l  
 CBitmap*pOld=tdc.SelectObject(&bm); VN<baK%]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); hKFB=U  
 tdc.SelectObject(pOld); [{rne2sA  
 BITMAP btm; q&EwD(k  
 bm.GetBitmap(&btm); N+ei)-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; HlX2:\\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]"\XTL0  
 BITMAPINFOHEADER bih; VDPq3`$+v{  
 bih.biBitCount=btm.bmBitsPixel; Wi!$bL`l  
 bih.biClrImportant=0; (:J U  
 bih.biClrUsed=0; <p8>"~ R  
 bih.biCompression=0; (I(k$g[>  
 bih.biHeight=btm.bmHeight; Y@V6/D} 1  
 bih.biPlanes=1; uBBW2  
 bih.biSize=sizeof(BITMAPINFOHEADER); \AB*C_Ri  
 bih.biSizeImage=size; ;Q%3WD  
 bih.biWidth=btm.bmWidth; +P"u1q*+p  
 bih.biXPelsPerMeter=0; e\i}@]  
 bih.biYPelsPerMeter=0; (`K ~p Z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;JR_z'<  
 static int filecount=0; bn"z&g   
 CString name; ju;Myi}a  
 name.Format("pict%04d.bmp",filecount++); IHf#P5y_  
 name=m_Path+name; <x1H:8A  
 BITMAPFILEHEADER bfh; fuA 8jx  
 bfh.bfReserved1=bfh.bfReserved2=0; gd\b]L?>O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m_>~e}2'A  
 bfh.bfSize=54+size; B7BikxUa  
 bfh.bfOffBits=54; Ty"=3AvRLV  
 CFile bf; k.w}}78N2N  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &pLCN[a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]7_O#MY1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 97SG;,6  
  bf.WriteHuge(lpData,size); !fG`xZ~  
  bf.Close(); V@1K  
  nCount++; ogKd}qTov  
 } WevXQ-eKm  
 GlobalFreePtr(lpData); %Z6\W; (n  
 if(nCount==1) =?- s azF&  
  m_Number.Format("%d picture captured.",nCount); jT q@@y  
 else Q##L|*Qy  
  m_Number.Format("%d pictures captured.",nCount); JB\BP$ap  
  UpdateData(FALSE); &5;y&dh  
} FuZLE%gP  
gT4H? #UB  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z`+j]NX]  
{ Ol. rjz9  
 if(pMsg -> message == WM_KEYDOWN) 1`8(O >5  
 { oq}Q2[.b  
  if(pMsg -> wParam == VK_ESCAPE) vH9Gf  
   return TRUE; t>>\U X  
  if(pMsg -> wParam == VK_RETURN) +S>}<OE  
   return TRUE; yzmwNsu  
 } 0_5j(   
 return CDialog::PreTranslateMessage(pMsg); 7u7 <"?v=  
} >c:- ;(k  
f:K`M W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ; +E@h=?  
{ #pw=HHq*(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ( -rw]=Qu  
  SaveBmp(); -}2e+DyAy  
  return FALSE; * E3 c--  
} K=C).5=U  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]&/KAk  
 CMenu pop; 1)f~OL8o  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y[@<goT  
 CMenu*pMenu=pop.GetSubMenu(0); k/ ZuFTN  
 pMenu->SetDefaultItem(ID_EXITICON); 9d!}]+"d42  
 CPoint pt; #T8$NZA  
 GetCursorPos(&pt); 4$!iw3N(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ec` $2u  
 if(id==ID_EXITICON) tpi>$:e  
  DeleteIcon(); zE NlL  
 else if(id==ID_EXIT) (" >gLr  
  OnCancel(); "ZyWU f  
 return FALSE; ~.wDb,*  
} wUz)9n 6j  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qP0_#l&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j?n:"@!G/  
 AddIcon(); ,o)U9 <  
 return res; Q-GnNT7MB3  
} hq^@t6!C\m  
N~An}QX|  
void CCaptureDlg::AddIcon() A?xb u*zV,  
{ `FM^)(wT  
 NOTIFYICONDATA data; A{Q:,S)  
 data.cbSize=sizeof(NOTIFYICONDATA); +t XOP|X  
 CString tip; ihJC)m`Hbl  
 tip.LoadString(IDS_ICONTIP); y 3O Nn~k  
 data.hIcon=GetIcon(0); #dgWXO  
 data.hWnd=GetSafeHwnd(); D%Y{(l+X  
 strcpy(data.szTip,tip); j\SW~}d9  
 data.uCallbackMessage=IDM_SHELL; cAE.I$T(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Y)I8(g}0  
 data.uID=98; qm)KO 4  
 Shell_NotifyIcon(NIM_ADD,&data); vYNh0)$%F  
 ShowWindow(SW_HIDE); J12 ZdC'O  
 bTray=TRUE; #}A >B  
} ep<2u x  
o[!g,Gmoh  
void CCaptureDlg::DeleteIcon() 4;ig5'U,  
{ zSi SZMP"  
 NOTIFYICONDATA data; Y Hv85y  
 data.cbSize=sizeof(NOTIFYICONDATA); E*Q><UU  
 data.hWnd=GetSafeHwnd(); zoV-@<Eh  
 data.uID=98; L. xzI-I@D  
 Shell_NotifyIcon(NIM_DELETE,&data); SAEr$F^  
 ShowWindow(SW_SHOW); &n:F])`2  
 SetForegroundWindow(); yv<0fQ  
 ShowWindow(SW_SHOWNORMAL);  o2ndnIL  
 bTray=FALSE;  -'|pt,)  
} Vhww-A  
O$%C(n(  
void CCaptureDlg::OnChange() sQS2U6  
{ ~4mgYzOmD`  
 RegisterHotkey(); .#;;pu7W  
} fodr1M4J  
?7cF_Zvve  
BOOL CCaptureDlg::RegisterHotkey() M9@#W"  
{ M#qZ0JT4  
 UpdateData(); *S.2p*Vd  
 UCHAR mask=0; P~0d'Oi  
 UCHAR key=0; O>Nop5#o  
 if(m_bControl) 4565U  
  mask|=4; Cse@>27s  
 if(m_bAlt) %XqLyeOS  
  mask|=2; Dc[Qu? ]LM  
 if(m_bShift) mdOF0b%-]  
  mask|=1; 'H`_Z e<  
  key=Key_Table[m_Key.GetCurSel()]; B*owV%  
 if(bRegistered){ y\Z-x  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8fdK|l w  
  bRegistered=FALSE; F~ n}Ep~1  
 } }q(IKH\&  
 cMask=mask; T] nZ3EZ  
 cKey=key; gtHk1 9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X!n-nms  
 return bRegistered; Kk~0jP_B9  
} U"xI1fg%b  
Z8=4cWI~;  
  四、小结 [j5 ^Zb&0  
6!i0ioZzi0  
  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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