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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: S}P rgw/  
  G ?Hx"3:?  
  一、实现方法 5uX-onP\[  
W6s-epsRmT  
  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: gW-mXb  
ZY|$[>X!  
#pragma data_seg("shareddata") W)<t7q+  
HHOOK hHook =NULL; //钩子句柄 $-p9cyk  
UINT nHookCount =0; //挂接的程序数目  u]OYu  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $H`{wJ?2(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 v~A*?WU;n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &^7(?C' u  
static int KeyCount =0; UP7?9\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #}HdylI\}  
#pragma data_seg() 9&bJ]  
C~IE_E&Q`  
  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。 NM"5.   
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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: zHKx,]9b  
UyAy?i8K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "r~/E|Da<  
cKey,UCHAR cMask) "&/lF[q  
{ [:zP]l.|  
 BOOL bAdded=FALSE; ^'n;W<\p)  
 for(int index=0;index<MAX_KEY;index++){ Q*hXFayx  
  if(hCallWnd[index]==0){ "Hk7s+%  
   hCallWnd[index]=hWnd; SZUo RWx  
   HotKey[index]=cKey; / E!N:g<  
   HotKeyMask[index]=cMask; 7h.fT`  
   bAdded=TRUE; {DapXx  
   KeyCount++; q8!]x-5$6j  
   break; YkbuyUui  
  } p<<dj%  
 } #;= sJ[m4  
 return bAdded; Tol"D2cyf  
} ~RH)iI  
//删除热键 cua( w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n1x"B>3  
{ q+} \ (|  
 BOOL bRemoved=FALSE; =!G{+&j  
 for(int index=0;index<MAX_KEY;index++){ B3<sSe8L0  
  if(hCallWnd[index]==hWnd){ ~e&O?X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A&A{Thz  
    hCallWnd[index]=NULL; /Pxny3  
    HotKey[index]=0; xE{slDl  
    HotKeyMask[index]=0; D/afa8>LQH  
    bRemoved=TRUE; dZox;_b  
    KeyCount--; {:|b,ep T  
    break; tXuf!  
   } "|Kag|(qB  
  } m@UrFPZ  
 } }kF?9w  
 return bRemoved; k?rJGc G  
} FKPR;H8>  
*I[tIO\  
J0imWluhQ  
  DLL中的钩子函数如下: tH~>uOZW  
4bcd=a;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p1\mjM  
{ /|lAxAm?  
 BOOL bProcessed=FALSE; B>4/[ YHr;  
 if(HC_ACTION==nCode) o7 0] F  
 { M!D6i5k,   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y^nm{;G+  
   switch(wParam) /=T:W*C  
   {  7xFZJ#  
    case VK_MENU: rP}[>  
     MaskBits&=~ALTBIT; i5=~tS  
     break; @t;726  
    case VK_CONTROL: M~n./wyC  
     MaskBits&=~CTRLBIT; 1rS8+!9C  
     break; [k0/ZfFwV  
    case VK_SHIFT: vvu $8n  
     MaskBits&=~SHIFTBIT; M ziOpraj  
     break; Wffz&pR8  
    default: //judge the key and send message &E1m{gB(  
     break; Qm=iCZ|E^!  
   } xI.0m  
   for(int index=0;index<MAX_KEY;index++){ /\;m/cwrl"  
    if(hCallWnd[index]==NULL) MMUlA$*t  
     continue; BOh^oQh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B[q"o I`  
    { @qYT/V*/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1*|/N}g)  
     bProcessed=TRUE; +,]VXH<y  
    } <s7cCpUFP  
   } &r,)4q+  
  } g~$UU(HX  
  else if((lParam&0xc000ffff)==1){ //有键按下 6B*#D.fd*  
   switch(wParam) Ndmw/ae  
   { f$tm<:)Y  
    case VK_MENU: T:Ovh.$  
     MaskBits|=ALTBIT; 7>f"4r_r6<  
     break; GwfCl{l  
    case VK_CONTROL: ksCF"o /@V  
     MaskBits|=CTRLBIT; ;4(}e{  
     break; x7Gf):,LK  
    case VK_SHIFT: ktS^^!,l%  
     MaskBits|=SHIFTBIT; :`E p#[Wvo  
     break; d S'J@e=#  
    default: //judge the key and send message z{FFTb^B  
     break; 2Y<]X7Ch:  
   } Vh>cV  
   for(int index=0;index<MAX_KEY;index++){ rlA/eQrS  
    if(hCallWnd[index]==NULL) 2gZ nrU  
     continue; Mi{ns $B%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?3 k_YN"  
    { 5 @-H8*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Yufj y=!  
     bProcessed=TRUE; hSR+7qN<e  
    } c/ih%xR  
   } `uUzBV.FR  
  } rmo\UCD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 kN78j  
   for(int index=0;index<MAX_KEY;index++){ I{r*Y9  
    if(hCallWnd[index]==NULL) l^OflZC~  
     continue; }r!+wp   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t=xEUOQAn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qTN%9!0@9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n>R(e>  
   } ,lStT+A  
  } =<#G~8WYz  
 } U4^c{KWS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?Pp*BB,*y  
} IVkB)9IW  
z#ki# o  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: *z)gSX  
i;U*Y *f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "M!m-]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _ilitwRN3  
UAT\ .  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 9cUa@;*1  
1YJ?Y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) biU_ImJ>0  
{ |/^S%t6*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gBi3^GxjM?  
 { 3l45(%g+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (XW'1@b  
  SaveBmp(); ]wdE :k,D  
  return FALSE; y`j=(|DV  
 } (tOhuSW  
 …… //其它处理及默认处理 G_J}^B*?%v  
} \~z$'3H`  
R y#C#0  
Hz."4nhv  
  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。 ZQ+DAX*MS  
:i4(cap&}F  
  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。 k&%i+5X  
IsE3-X|  
  二、编程步骤 9#@s(s  
Ie!&FQe2q  
  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"; `=P_ed%&'  
Mmu#hb|W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; FZ ?eX`,  
BZHoRd{EH  
  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; :;yrYAyT3  
j&_>_*.y  
  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; }`Ya;  
Z|$DchC  
  5、 添加代码,编译运行程序。 $x+7.%1m)~  
} O $]xB  
三、程序代码 y|KQ`;  
h=gtuaR4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL VOM@x%6#c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  MiIxj%,(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ycspdl+(S$  
#if _MSC_VER > 1000 v N\[2r%S  
#pragma once Vjv6d&Q  
#endif // _MSC_VER > 1000 `Ucj_6&Tqs  
#ifndef __AFXWIN_H__ D@gC(&U/6  
#error include 'stdafx.h' before including this file for PCH k|?[EWIi^  
#endif 3&7? eO7*  
#include "resource.h" // main symbols * 7Ov.v%  
class CHookApp : public CWinApp &C+2p  
{ 3PZ(Kn<  
 public: 1h?ve,$  
  CHookApp(); Yq6 @R|u  
  // Overrides CYgokS\=,  
  // ClassWizard generated virtual function overrides ZxSFElDD]E  
  //{{AFX_VIRTUAL(CHookApp) Se'SDJl=  
 public: 4n6AK`E  
  virtual BOOL InitInstance(); L r"cO|F  
  virtual int ExitInstance(); Ht(TYq  
  //}}AFX_VIRTUAL )Bn }|6`  
  //{{AFX_MSG(CHookApp) 4RB%r  
  // NOTE - the ClassWizard will add and remove member functions here. gM>?w{!LBx  
  // DO NOT EDIT what you see in these blocks of generated code ! f^B'BioW(  
  //}}AFX_MSG {qi #  
  DECLARE_MESSAGE_MAP() _7Y-gy#\a  
}; P@ew' JL%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8`urkEI^r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5(J?C-Pk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D^6iQW+.P  
BOOL InitHotkey(); ,o%by5j"^N  
BOOL UnInit(); V~j^   
#endif sV,Yz3E<u$  
1L4-;HYJm  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. aYT!xdCI  
#include "stdafx.h" ah,f~.X_|  
#include "hook.h" $M,<=.oT  
#include <windowsx.h> 4tLdqs  
#ifdef _DEBUG go AV+V7  
#define new DEBUG_NEW m\XsU?SuX  
#undef THIS_FILE q9rm9#}[J#  
static char THIS_FILE[] = __FILE__; FsJk"$}  
#endif 3`%E;?2  
#define MAX_KEY 100 n4S`k%CI  
#define CTRLBIT 0x04 xw}yl4WT{  
#define ALTBIT 0x02 v{t pRL0  
#define SHIFTBIT 0x01 hZ*vk  
#pragma data_seg("shareddata") tt?`,G.(]  
HHOOK hHook =NULL; 2} pZyS  
UINT nHookCount =0; BYEZ[cM  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1bQO:n):~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c.Sd~k:3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |YROxY"ML  
static int KeyCount =0; L7buY(F(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6CHb\k  
#pragma data_seg() j AOy3c  
HINSTANCE hins; dv\bkDF4A  
void VerifyWindow(); 1gkpK`u(B  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) M9R'ONYAa  
//{{AFX_MSG_MAP(CHookApp) Eqz|eS*6  
// NOTE - the ClassWizard will add and remove mapping macros here. 9gw;MFP)D  
// DO NOT EDIT what you see in these blocks of generated code! z+Fu{<#(  
//}}AFX_MSG_MAP eZ(ThA*2=t  
END_MESSAGE_MAP() uc@4fn  
EGt 50  
CHookApp::CHookApp() er7(Wph  
{ (Q=o 9o:b  
 // TODO: add construction code here, SkmTW@v  
 // Place all significant initialization in InitInstance CYy=f-  
} -_t4A *  
XJeWhk3R9  
CHookApp theApp; ptT-{vG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :Q("  
{ Ue 9Y+'-x  
 BOOL bProcessed=FALSE; _-y1>{]H  
 if(HC_ACTION==nCode) we`BqZV  
 { SXqB<j$.;  
  if((lParam&0xc0000000)==0xc0000000){// Key up ?g4Rk9<!i  
   switch(wParam) V/2NIh  
   { 9&f+I@K  
    case VK_MENU: CdRJ@Lf  
     MaskBits&=~ALTBIT; PY7H0\S)  
     break; KF+r25uy[+  
    case VK_CONTROL: OgIRI8L  
     MaskBits&=~CTRLBIT; mA$y$73=T  
     break; ?j/FYi  
    case VK_SHIFT: |8CxMs  
     MaskBits&=~SHIFTBIT; _LwF:19Il  
     break; \;~Nj#  
    default: //judge the key and send message 8+|W%}  
     break; s,#We} bv  
   } 9zqo!&  
   for(int index=0;index<MAX_KEY;index++){ n46!H0mJ  
    if(hCallWnd[index]==NULL) H~s8M  
     continue; 6?[P^{GpH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IxuK<Oe:O  
    { rIFW1`N}i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %p  
     bProcessed=TRUE; b-VtQ%Q  
    } VBi gUK4  
   } K9Mz4K_  
  } 2YZ>nqy  
  else if((lParam&0xc000ffff)==1){ //Key down # tu>h  
   switch(wParam) Gl'G;F$Y-  
   { W/BPf{U  
    case VK_MENU: ;]grbqXVE  
     MaskBits|=ALTBIT; 41Q 5%2  
     break; $L0sBW&  
    case VK_CONTROL: 4xg)e` *U  
     MaskBits|=CTRLBIT; e7"T37  
     break; pTq DPU  
    case VK_SHIFT: !Ea >tQ|  
     MaskBits|=SHIFTBIT; J/e]  
     break; Wx]Xa]-  
    default: //judge the key and send message RVm-0[m}  
     break; hJxL|5Uo  
   } /J-'[Mc'D[  
   for(int index=0;index<MAX_KEY;index++) *h0D,O"0  
   { RN-gZ{AW  
    if(hCallWnd[index]==NULL) .8s-)I  
     continue; f#:3 TJV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %f&Y=  
    { YOLzCnI4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); uT, i&  
     bProcessed=TRUE; LcvczS T  
    } C`_/aR6  
   } 9F[3B`w  
  } Hh;lT  
  if(!bProcessed){ uc+{<E3,%  
   for(int index=0;index<MAX_KEY;index++){ q]OIP"yv  
    if(hCallWnd[index]==NULL) >R]M:Wx  
     continue; O>pX(DS L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4@fv%LOQo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _N|%i J5  
   } [pTdeg;QE  
  } k)7i^ 1U  
 } 7oF3^K'S  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {Cm!5QYy  
} d*{Cv2A.  
<!RkkU& 6  
BOOL InitHotkey() W>a}g[Ad  
{ YRV h[Bqg`  
 if(hHook!=NULL){ )/ 'WboL  
  nHookCount++; td7(444]  
  return TRUE; %z@ Z^Jv  
 } b3-j2`#  
 else }_KzF~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); m0;j1-t  
  if(hHook!=NULL) Lp:VU-S  
   nHookCount++; 8WQ#)  
  return (hHook!=NULL); #[9UCX^=  
} mM&P&mz/D  
BOOL UnInit() :a/rwZ[r  
{ &v .S_Ym  
 if(nHookCount>1){ C5ILVQ  
  nHookCount--; w;ZT-Fti  
  return TRUE; <}[ !k<  
 } BH {z]a  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  :'F,l:  
 if(unhooked==TRUE){ 'qT;Eht5  
  nHookCount=0; +Xw%X3o)  
  hHook=NULL; zs]ubJC@  
 } >&;J/ME  
 return unhooked; J@/4CSCR]  
} xwZ1Q,'C  
\0 h>!u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 18NnXqe-m  
{ ;6PU  
 BOOL bAdded=FALSE; `{{6vb^g  
 for(int index=0;index<MAX_KEY;index++){ UZs '[pm)  
  if(hCallWnd[index]==0){ HI|egf@  
   hCallWnd[index]=hWnd; G 0pq'7B  
   HotKey[index]=cKey; :Y/aT[  
   HotKeyMask[index]=cMask; 3>VL>;75[  
   bAdded=TRUE; A@< !'  
   KeyCount++; HcIJ&".~  
   break; A)9]^@,  
  } 3Ed  
 } eGQ4aQhi  
 return bAdded; (LTu=1  
} 8m' f8.x  
Vc9Bg2f5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ":+d7xR?o  
{ </_QldL_  
 BOOL bRemoved=FALSE; ,H6P%  
 for(int index=0;index<MAX_KEY;index++){ zNo,PERG  
  if(hCallWnd[index]==hWnd){ @Ik5BT  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J&\Q3_vro9  
    hCallWnd[index]=NULL; (v?@evQ  
    HotKey[index]=0; E va&/o?P|  
    HotKeyMask[index]=0; wry`2_c  
    bRemoved=TRUE; ."dT6uE  
    KeyCount--; OAq-(_H  
    break; l=XZBe*[g'  
   } YG0/e#5  
  } F>{bVPh VA  
 } #g$I>\O<  
 return bRemoved; )wjpxr  
} ru`7iqcz  
DDmC3  
void VerifyWindow() mr}o0@5av  
{ HqV55o5f'  
 for(int i=0;i<MAX_KEY;i++){ yWZ_  
  if(hCallWnd!=NULL){ kXhd]7ru  
   if(!IsWindow(hCallWnd)){ `TO Xkt j  
    hCallWnd=NULL; hb*Y-$Zp  
    HotKey=0; Cu%BU}(  
    HotKeyMask=0; 4qDO(YWf  
    KeyCount--; 4 `l$0m@>  
   } ~\-=q^/!  
  } <#BK(W~$  
 } y]{b4e  
} 51eZfJB  
A*0X ~6W  
BOOL CHookApp::InitInstance() K3:z5j.X  
{ 4S 4MQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Nk -xnTZ"  
 hins=AfxGetInstanceHandle(); 8 t=H  
 InitHotkey(); _"Y7}A\9  
 return CWinApp::InitInstance(); wE1GyN  
} QyTN  V  
-ABj>y[  
int CHookApp::ExitInstance() U*K4qJ6U  
{ ,s%+vD$O^  
 VerifyWindow(); RvA "ug.*  
 UnInit(); 2d|^$$#`  
 return CWinApp::ExitInstance(); 0c"9C_7^g  
} 2UYtEJ(?`{  
5w>TCx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V$DB4YM1k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]E"J^mflGK  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |+8rYIms`  
#if _MSC_VER > 1000 V8F! o  
#pragma once Oq<3&*  
#endif // _MSC_VER > 1000 !8|r$mN8  
'uz o[>p  
class CCaptureDlg : public CDialog R $<{"b  
{ !2AD/dtt   
 // Construction 4S>#>(n7=  
 public: Q3+%8zZI  
  BOOL bTray; h-(NWxK+  
  BOOL bRegistered; tpzWi W/  
  BOOL RegisterHotkey(); g0jf Lv  
  UCHAR cKey; 9mtndTT 5u  
  UCHAR cMask; IG}yGGn  
  void DeleteIcon(); S`[(y?OF?  
  void AddIcon(); 2IHS)kkT|  
  UINT nCount; L=#B>Eu  
  void SaveBmp(); s'tXb=!HO  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H{E(=S  
  // Dialog Data tAjT-CXg  
  //{{AFX_DATA(CCaptureDlg) PQ!'<  
  enum { IDD = IDD_CAPTURE_DIALOG }; \l0!si  
  CComboBox m_Key; Fi+ DG?zu  
  BOOL m_bControl; G $*=9`  
  BOOL m_bAlt; |;V-;e*  
  BOOL m_bShift; BuM #&]s  
  CString m_Path; FDiDHOR  
  CString m_Number; 5R.jhYAj  
  //}}AFX_DATA #%GBopv  
  // ClassWizard generated virtual function overrides kQ\l7xd  
  //{{AFX_VIRTUAL(CCaptureDlg) )qX.!&|I  
 public: lgt&kdc%o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &9v8  
 protected:  !N\_D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cc=_KYZ1k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -2laM9Ed  
  //}}AFX_VIRTUAL :k_)Bh?+  
  // Implementation #Z]Cq0=  
 protected: h3>u[cX%  
  HICON m_hIcon; b't6ekkN  
  // Generated message map functions :L:] 3L  
  //{{AFX_MSG(CCaptureDlg) R ^@`]dX$  
  virtual BOOL OnInitDialog(); &>.QDO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :O,,fJ<x.O  
  afx_msg void OnPaint(); uUBUUr  
  afx_msg HCURSOR OnQueryDragIcon(); S~z$ =IiB  
  virtual void OnCancel(); H,;ZFg/v8  
  afx_msg void OnAbout(); n~>b}DY  
  afx_msg void OnBrowse(); H^B,b !5i  
  afx_msg void OnChange(); xV`)?hEXFh  
 //}}AFX_MSG hms Aim9i  
 DECLARE_MESSAGE_MAP() "{S4YA  
}; *.$ov<E.  
#endif &j'k9C2p  
kMzDmgoxNg  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file * kL>9  
#include "stdafx.h"  k_^ 4NU  
#include "Capture.h" o}wRgG  
#include "CaptureDlg.h" [D?xd/G  
#include <windowsx.h> %PR,TWe  
#pragma comment(lib,"hook.lib") e7Gb7c~  
#ifdef _DEBUG 9*"K+t:  
#define new DEBUG_NEW Q.8^F  
#undef THIS_FILE mT j  
static char THIS_FILE[] = __FILE__; qncZpXw^  
#endif |j8#n`'  
#define IDM_SHELL WM_USER+1 uRuu!{$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UK8k`;^KI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dj,lbUL  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3uvl'1(%J  
class CAboutDlg : public CDialog uuUj IZCtz  
{ 7 oYD;li$k  
 public: kd p*6ynD  
  CAboutDlg(); jt @2S  
  // Dialog Data )zP"Uuu  
  //{{AFX_DATA(CAboutDlg) L^s?EqLXS  
  enum { IDD = IDD_ABOUTBOX }; RHu,t5,  
  //}}AFX_DATA \"yR[.Q?   
  // ClassWizard generated virtual function overrides T sJ71  
  //{{AFX_VIRTUAL(CAboutDlg) /3"S_KE1@+  
 protected: S]&i<V1qX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f .h$jyp(  
  //}}AFX_VIRTUAL BNJG-b|g^  
  // Implementation :w4H$+j  
 protected: _ -ec(w~/  
  //{{AFX_MSG(CAboutDlg) `Sj8IxO  
  //}}AFX_MSG Frhm4H%,_R  
  DECLARE_MESSAGE_MAP() bx".<q(  
}; tJGPkeA  
N7s9"i  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k[1[Y{n.  
{ O1]XoUH<  
 //{{AFX_DATA_INIT(CAboutDlg) 9 771D  
 //}}AFX_DATA_INIT aO<H!hK  
} cwUor}<|  
Z\?!& &  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ryd}-_LL  
{ `AdHyE  
 CDialog::DoDataExchange(pDX); d7kv <YG  
 //{{AFX_DATA_MAP(CAboutDlg) h* /  
 //}}AFX_DATA_MAP wz:w6q  
} Ki)hr%UFw  
\\"CgH-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V/"41  
 //{{AFX_MSG_MAP(CAboutDlg) >\5ZgC  
 // No message handlers uMC0XE|S  
 //}}AFX_MSG_MAP &)~LGWBdC  
END_MESSAGE_MAP() xA}{ZnTbN  
i079 V  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @ 6b;sv1W  
: CDialog(CCaptureDlg::IDD, pParent) SYOU &*  
{ 8wS9%+  
 //{{AFX_DATA_INIT(CCaptureDlg) f K4M:_u  
  m_bControl = FALSE; } 4>#s$.2  
  m_bAlt = FALSE; 61TL]S8  
  m_bShift = FALSE; cja-MljD  
  m_Path = _T("c:\\"); XoiZ"zE  
  m_Number = _T("0 picture captured."); nm,Tng oj  
  nCount=0; m )<N:|  
  bRegistered=FALSE;  & *&  
  bTray=FALSE; 'Cywn^Ym#  
 //}}AFX_DATA_INIT %__.-;)o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JnH5v(/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6tM@I`l  
} .aIFm5N3?  
lU3Xd_v O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %x$mAOUv  
{ 0I.!  
 CDialog::DoDataExchange(pDX); 'V Y\ut  
 //{{AFX_DATA_MAP(CCaptureDlg) )4/UzR$  
  DDX_Control(pDX, IDC_KEY, m_Key); A`b )7+mB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }% ?WS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9**u\H)P6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); D_cd l^  
  DDX_Text(pDX, IDC_PATH, m_Path); D-5~CK4`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~/R}K g(  
 //}}AFX_DATA_MAP nx4E}8!Lh  
} 0h2MmI#  
[WunA,IuR  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <=~'Pd-f(  
//{{AFX_MSG_MAP(CCaptureDlg) 4b$m\hoN  
 ON_WM_SYSCOMMAND() 7m 9T'  
 ON_WM_PAINT() ;W#/;C _h  
 ON_WM_QUERYDRAGICON() '#8;bU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7)3cq}]O  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) k Nw3Qr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) S4X['0rX!  
//}}AFX_MSG_MAP 7otqGE\2  
END_MESSAGE_MAP() C)s*1@af  
$U5$*R@jo[  
BOOL CCaptureDlg::OnInitDialog() X1h*.reFAL  
{ v{>9&o.J  
 CDialog::OnInitDialog(); $S!WW|9j.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); y/A<eHLy  
 ASSERT(IDM_ABOUTBOX < 0xF000); OBp/:]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]G2%VKkr  
 if (pSysMenu != NULL) p$%g$K  
 { 9!6yo  
  CString strAboutMenu; Z{.L_ ]$ I  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /B9jmvj`  
  if (!strAboutMenu.IsEmpty()) bk-aj'>+  
  { u&Dd9kMz  
   pSysMenu->AppendMenu(MF_SEPARATOR); iJK rNRj  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,k3aeM~`%w  
  } CU(W0D  
 } s((_^yf  
 SetIcon(m_hIcon, TRUE); // Set big icon ?GGh )";y  
 SetIcon(m_hIcon, FALSE); // Set small icon @-qC".CI  
 m_Key.SetCurSel(0); ()i!Uo  
 RegisterHotkey(); QJ-?6 7_i  
 CMenu* pMenu=GetSystemMenu(FALSE); ! J@pox-t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `<l|XPv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \\~4$Ai[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); t]%! vXo  
 return TRUE; // return TRUE unless you set the focus to a control kOuQR$9s  
} ^l/$ 13=  
} u7&SU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) UwxrYouv~@  
{ 6Bm2_B  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 84dej<   
 { 0<S(zva7([  
  CAboutDlg dlgAbout; C!" .[3  
  dlgAbout.DoModal(); 6ypqnOTr  
 } V_7xXuM/  
 else A,s .<TG  
 { @$'1  
  CDialog::OnSysCommand(nID, lParam); }tT*Ch?u  
 } 9^c"HyR  
} { e %  
l+V5dZ8W  
void CCaptureDlg::OnPaint() "ae55ft//  
{ Jid:$T>  
 if (IsIconic()) 5{|\h}  
 { $pGk%8l%  
  CPaintDC dc(this); // device context for painting aw:0R=S,>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {*C LWs4  
  // Center icon in client rectangle p^``hP:J  
  int cxIcon = GetSystemMetrics(SM_CXICON); .el_pg  
  int cyIcon = GetSystemMetrics(SM_CYICON); Rx=pk  
  CRect rect; FR@ dBcJUU  
  GetClientRect(&rect); B1Iq:5nmoS  
  int x = (rect.Width() - cxIcon + 1) / 2; {N,w5!cP  
  int y = (rect.Height() - cyIcon + 1) / 2; uy;3s=03^  
  // Draw the icon DD hc^(  
  dc.DrawIcon(x, y, m_hIcon); gB@Wv9 1  
 } .tb~f@xL  
 else ARu^hz=  
 { I1H:h  
  CDialog::OnPaint(); <cz~q=%v2&  
 } wB( igPi  
} l9.wMs*`X  
),6Z1 K1  
HCURSOR CCaptureDlg::OnQueryDragIcon() c$'UfW  
{ g%<7Px[W  
 return (HCURSOR) m_hIcon; {:enoV"  
} 6A/|XwfE/v  
K~WwV8c9;  
void CCaptureDlg::OnCancel() Z@8amT;Y  
{ /qL&)24  
 if(bTray) qQ6NxhQo  
  DeleteIcon(); 9aC>gye!  
  CDialog::OnCancel(); HF\L`dJX?  
} \ca4X{x  
E%-&!%_>D@  
void CCaptureDlg::OnAbout() BWX&5""  
{ <s#}`R.#2  
 CAboutDlg dlg; EX&y !  
 dlg.DoModal(); &/, BFx"  
} 3)g1e=\i$  
X6<HNLgra  
void CCaptureDlg::OnBrowse() ;o3 .<"  
{ ?t} [Wi}7  
 CString str; RGtUKr'  
 BROWSEINFO bi; T "G!H  
 char name[MAX_PATH]; m x,X!}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .[Sv|;x"E  
 bi.hwndOwner=GetSafeHwnd(); 9AL\6 @<a*  
 bi.pszDisplayName=name; )-a_,3x%j  
 bi.lpszTitle="Select folder"; C>;yW7*g"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; r%'2a+}D  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5#f&WL*U@  
 if(idl==NULL)  D#m+w  
  return; oaBfq8,;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8a)EL*LH`  
 str.ReleaseBuffer(); +-~;?wA  
 m_Path=str; 28BiuxVW  
 if(str.GetAt(str.GetLength()-1)!='\\') =C\S6bF%  
  m_Path+="\\"; ak;Z;  
 UpdateData(FALSE); r$\g6m  
} ~0 FqY &4  
$C)@GGY  
void CCaptureDlg::SaveBmp() iQGoy@<R  
{ "3j0)  
 CDC dc; G:e}>'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3^su%z_%  
 CBitmap bm; $~~=SOd0  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]aakEU  
 int Height=GetSystemMetrics(SM_CYSCREEN); -G Kelz?h>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); LbYI{|_Js  
 CDC tdc; ?n@PZL= ]  
 tdc.CreateCompatibleDC(&dc); (%fGS.TR  
 CBitmap*pOld=tdc.SelectObject(&bm); dadMwe_l0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w pCS]2  
 tdc.SelectObject(pOld); (x$k\H  
 BITMAP btm; ?I@3`?'  
 bm.GetBitmap(&btm); 3P\I;xM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; b]g.>$[nX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O: BP35z_F  
 BITMAPINFOHEADER bih; [7s5Vt|  
 bih.biBitCount=btm.bmBitsPixel; ;Ok11wOw  
 bih.biClrImportant=0; ?<LG(WY  
 bih.biClrUsed=0; n'h )(^  
 bih.biCompression=0; D@JHi'F  
 bih.biHeight=btm.bmHeight; 6|dUz*Pr|\  
 bih.biPlanes=1; >Ia(g0  
 bih.biSize=sizeof(BITMAPINFOHEADER); <0LB]zDWe6  
 bih.biSizeImage=size; wFd*6%  
 bih.biWidth=btm.bmWidth; -=sxbs.aA  
 bih.biXPelsPerMeter=0; 462ae` 6l  
 bih.biYPelsPerMeter=0; *r% mqAx(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <s7{6n')  
 static int filecount=0; g<dCUIbcQ  
 CString name; ~!nd'{{9  
 name.Format("pict%04d.bmp",filecount++); ytC{E_  
 name=m_Path+name; pM7BdMp   
 BITMAPFILEHEADER bfh; PvB?57wkF  
 bfh.bfReserved1=bfh.bfReserved2=0; F'~/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); P`%ppkzV6  
 bfh.bfSize=54+size; *HXq`B  
 bfh.bfOffBits=54; ;_SS3q  
 CFile bf; 0,A?*CO  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bT*4Qd4W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Cg|uHI*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `k\1vum  
  bf.WriteHuge(lpData,size); ^#Y6 E  
  bf.Close(); M!jW=^\  
  nCount++; &+^ # `nq  
 } qlxW@|  
 GlobalFreePtr(lpData); P3 Evv]sB@  
 if(nCount==1) Ni)#tz_9  
  m_Number.Format("%d picture captured.",nCount); O``MUb b  
 else =!c+|X`  
  m_Number.Format("%d pictures captured.",nCount); J-ZM1HoB  
  UpdateData(FALSE); ~^C7(g )  
} g`6wj|@ =W  
cU6#^PFu  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) E0h p%:  
{ s*X\%!l9  
 if(pMsg -> message == WM_KEYDOWN) &B85;  
 { v}Nx*%  
  if(pMsg -> wParam == VK_ESCAPE) $^XPk#$m  
   return TRUE; $P@cS1sB  
  if(pMsg -> wParam == VK_RETURN) '_<`dzz  
   return TRUE; 3"hR:'ts  
 } .#eXNyCe  
 return CDialog::PreTranslateMessage(pMsg); >V$#Um?AXj  
} 2r0!h98  
(qP$I:Q4]v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Iq=B]oE  
{ 8WGM%n#q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :V2 Q n-N  
  SaveBmp(); }:8>>lQ  
  return FALSE; Xda<TX@-  
} ,+BgY4OY  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &}$D[ 4N  
 CMenu pop; / IS WC   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &aQ)x   
 CMenu*pMenu=pop.GetSubMenu(0); =arsoCa  
 pMenu->SetDefaultItem(ID_EXITICON); MB 5[Js|  
 CPoint pt; DQICD.X6R  
 GetCursorPos(&pt); }\{1`$*~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); vTEkh0Ys  
 if(id==ID_EXITICON) %Tb|Yfyr C  
  DeleteIcon(); #G=QL(f>/  
 else if(id==ID_EXIT) {4 d$]o0V  
  OnCancel(); %Eh%mMb^  
 return FALSE; u_"h/)C'H  
} 1c"m$)a4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4w6K|v<X  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Y fA\#N0;3  
 AddIcon(); X&~Eo  
 return res; R"o,m  
} @]tGfr;le&  
15:@pq\  
void CCaptureDlg::AddIcon() "6.p=te  
{ $I36>  
 NOTIFYICONDATA data; yy1r,dw  
 data.cbSize=sizeof(NOTIFYICONDATA); +"cyOC  
 CString tip; }_22 wjm~  
 tip.LoadString(IDS_ICONTIP); z\Y^x 9  
 data.hIcon=GetIcon(0); IpXhb[UZ?  
 data.hWnd=GetSafeHwnd(); \KXEw2S  
 strcpy(data.szTip,tip); z}tp0~C  
 data.uCallbackMessage=IDM_SHELL; mO> M=2A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sr+mY;   
 data.uID=98; an`(?6d  
 Shell_NotifyIcon(NIM_ADD,&data); ncr-i!Jjk  
 ShowWindow(SW_HIDE); P/9J!.Cm  
 bTray=TRUE; 9y*! W  
} 2vN(z %p  
-\$cGIL  
void CCaptureDlg::DeleteIcon() RbM~E~$  
{ $)]FCuv  
 NOTIFYICONDATA data; 2H+DT-hK  
 data.cbSize=sizeof(NOTIFYICONDATA); :t S"sM  
 data.hWnd=GetSafeHwnd(); WG luY>C;  
 data.uID=98; ee^_Dh4  
 Shell_NotifyIcon(NIM_DELETE,&data); MEnHC'nI  
 ShowWindow(SW_SHOW); Jwt I(>cI  
 SetForegroundWindow(); Q3q.*(#  
 ShowWindow(SW_SHOWNORMAL); faOWhIG  
 bTray=FALSE; %u0;.3Gw  
} *9ub.:EUwV  
si_ HN{  
void CCaptureDlg::OnChange() m=,c,*>  
{ gA1in  
 RegisterHotkey(); p-r%MnT  
} 5@ +Ei25  
MxEAs}MDv  
BOOL CCaptureDlg::RegisterHotkey() J8BT%  
{ :_a]T-GL  
 UpdateData(); i!oj&&  
 UCHAR mask=0; dKQV4dc>  
 UCHAR key=0; G1_@! 4  
 if(m_bControl) DjzBG*f/  
  mask|=4; \g1@A"  
 if(m_bAlt) -b0'Q  
  mask|=2; "HfU,$[  
 if(m_bShift) {ah~q}(P  
  mask|=1; uEGPgYY(  
  key=Key_Table[m_Key.GetCurSel()]; GR[>mkW!M  
 if(bRegistered){ +Cg"2~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); G=5t5[KC  
  bRegistered=FALSE; +Z<Q^5w@  
 } j~*Z7iu  
 cMask=mask; e=z_+gVm  
 cKey=key; `N.$LY;8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eoe^t:5&  
 return bRegistered; Qr%Jm{_o  
} 9Y%?)t.2  
zHOE.V2Qo  
  四、小结 HU[nN*  
|z]2KjF&w-  
  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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