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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: >K*TgG6!X  
  Dpkc9~z  
  一、实现方法 Voo_ ?  
5@EX,$h  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: wpa^]l  
VWW(=j  
#pragma data_seg("shareddata") u"-."_  
HHOOK hHook =NULL; //钩子句柄 ,B$e'KQ  
UINT nHookCount =0; //挂接的程序数目 7'RU\0QG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (|sqN8SbA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /vAA]n8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &Vbcwv@  
static int KeyCount =0; &24>9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~' q&rvk`  
#pragma data_seg() 15ImwQ  
<ELqj2`c  
  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。 O6]X\Cwj%  
lB(P+yY,/'  
  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: ~`<_xIvrq  
23'Ac,{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }u.1$Y  
cKey,UCHAR cMask) A?H.EZ  
{ aj}#~v1  
 BOOL bAdded=FALSE; hD,@>ky  
 for(int index=0;index<MAX_KEY;index++){ [-2Tj)P C  
  if(hCallWnd[index]==0){ .83z =  
   hCallWnd[index]=hWnd; k@Bn}r  
   HotKey[index]=cKey;  EHda  
   HotKeyMask[index]=cMask; ]]/p.#oD,  
   bAdded=TRUE; /OeOL3Y  
   KeyCount++; tx]!|x" F  
   break; YQaL)t$0  
  } VV"1IR  
 } \= Wrh3  
 return bAdded; J-W8wCq`  
} D`NQEt"(  
//删除热键 dwz {Yw(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M 9/J!s  
{ ?}<Wmy2A  
 BOOL bRemoved=FALSE; &NK6U  
 for(int index=0;index<MAX_KEY;index++){ +?uZ~VSl  
  if(hCallWnd[index]==hWnd){ 5mg] su&#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O>>%lr|  
    hCallWnd[index]=NULL; 2x:aMWh  
    HotKey[index]=0; %J :2y  
    HotKeyMask[index]=0; 4H hQzVM{  
    bRemoved=TRUE; GtkZ%<KF9  
    KeyCount--; ;xjw'%n,  
    break; J4jL%5t  
   } s` o _ER  
  } !KLY*bt6  
 } H~~>ut6`  
 return bRemoved; -}P/<cu:  
} dgW/5g  
]-g4C t_V  
zN>tSdNkI-  
  DLL中的钩子函数如下: H)NT2@%{P  
Rs53R$PIR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +6\1 d5  
{ $<d3g :  
 BOOL bProcessed=FALSE; WGI4DzKa  
 if(HC_ACTION==nCode) CxJH)H$  
 { -](3iPy}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9P#<T7  
   switch(wParam) $GX9-^og=T  
   {  B2)SNhF2Y  
    case VK_MENU: ?#VkzT  
     MaskBits&=~ALTBIT; ;(;{~1~  
     break; LAv!s/O$=  
    case VK_CONTROL: o '!WW  
     MaskBits&=~CTRLBIT; ;1>)p x**  
     break; RyZy2^0<  
    case VK_SHIFT: R% )7z)~  
     MaskBits&=~SHIFTBIT; )U:W 9%  
     break; xkmqf7w  
    default: //judge the key and send message [+>cW0a  
     break; j(];b+>  
   } lvIdYf$?  
   for(int index=0;index<MAX_KEY;index++){ +{@hD+  
    if(hCallWnd[index]==NULL) o|c%uw  
     continue; S01 Bc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'v_VyK*w  
    { zn/b\X/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q5/BEUkC  
     bProcessed=TRUE; btv.M  
    } 'Y:ZWac,  
   } nVv=smVOt  
  } KmaMS(A(3  
  else if((lParam&0xc000ffff)==1){ //有键按下 8eZ^)9m  
   switch(wParam) Bey|f/ <  
   { 1|3{.Ed  
    case VK_MENU: WcKL=Z?(  
     MaskBits|=ALTBIT; ys Td'J  
     break; t^(wbC  
    case VK_CONTROL: ^.(i!BG'  
     MaskBits|=CTRLBIT; V"Y-|R  
     break; ^RE("'+  
    case VK_SHIFT: w $z]Z-  
     MaskBits|=SHIFTBIT; L(\o66a-rV  
     break; bs\7 juHt  
    default: //judge the key and send message OjBg$f~0F  
     break; nZ~J &QK-  
   } >e9xM Gv  
   for(int index=0;index<MAX_KEY;index++){ Ah1fcXED  
    if(hCallWnd[index]==NULL) i")ucrf  
     continue; ky |Py  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h-=lZ~W~  
    { t.= 1<Ed  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Kf'oXCs  
     bProcessed=TRUE; J?84WS  
    } qo5WZ be  
   } J G3#(DVc;  
  } ~6O<5@k  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 U+'h~P'4  
   for(int index=0;index<MAX_KEY;index++){ e$=0.GWT  
    if(hCallWnd[index]==NULL) t+m ug  
     continue; %TA@-tK=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `=VN\W^&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $C~OV@I  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x /xd  
   } ;_?RPWZ;MO  
  } o+ 0"@B  
 } LSW1,}/B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +6+!M_0wA  
} _!?iiO  
ucgp=bye  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: }='1<~0  
<ZgbmRY8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M3/_E7Qoj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ieG%D HN  
pZO`18z  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: >Sua:Uff  
D}6~2j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L[cl$ pYV  
{ pG(%yIiAi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Hv.n O-c  
 { ecG,[1];  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9|9Hk1  
  SaveBmp(); {8Uk]   
  return FALSE; D_)n\(3  
 } zTQTmO  
 …… //其它处理及默认处理 TEt+At`]  
} %W:]OPURK  
F)^:WWVc#  
>{huaN B  
  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。 QocR)aN=+  
Qg' {RAV8  
  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。 (2fWJ%7VG  
Rw#4 |&  
  二、编程步骤 c2d=dGP>~f  
!e0~|8  
  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"; ibIo1i//[  
(!^; ar^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; AQa;D2B$  
hRKA,u/G  
  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; Zcg@]Sx(I  
yPhTCr5pK  
  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; U5x&? n<  
cop \o4ia  
  5、 添加代码,编译运行程序。 /R% Xkb  
T\Ld)'fNv  
三、程序代码 K,Z_lP_~Vw  
N 56/\1R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \c.MIDp"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |H7f@b]Sk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ uDXRw*rTv  
#if _MSC_VER > 1000 y o |"-  
#pragma once ^CWxYDG*  
#endif // _MSC_VER > 1000 XlGDv*d:#d  
#ifndef __AFXWIN_H__ K:\db'``  
#error include 'stdafx.h' before including this file for PCH (np60mX<  
#endif cczV}m2)  
#include "resource.h" // main symbols z c7P2@  
class CHookApp : public CWinApp iR(jCD?) Y  
{ ,/ bv3pE  
 public: n~|sMpd,M1  
  CHookApp(); 01/yog  
  // Overrides a-<&(jV  
  // ClassWizard generated virtual function overrides /6PL  
  //{{AFX_VIRTUAL(CHookApp) :]g>8sWL  
 public: Bp>Z?"hTe  
  virtual BOOL InitInstance(); (viGL|Ogn  
  virtual int ExitInstance(); z.%K5vrO>  
  //}}AFX_VIRTUAL ^a+H`RD  
  //{{AFX_MSG(CHookApp) s 8 c#_  
  // NOTE - the ClassWizard will add and remove member functions here. WY 'QhieH  
  // DO NOT EDIT what you see in these blocks of generated code ! ueD_<KjE=  
  //}}AFX_MSG 4itadQS  
  DECLARE_MESSAGE_MAP() %;-] HI  
}; 9pJk.Np0   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M8HHyV[AmC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E|K~WO]>o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DcL;7IT  
BOOL InitHotkey(); suP/I?4'@  
BOOL UnInit(); 8Z:T.Gc  
#endif 'ZboLoS*-  
12JmSvD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. x%d\}%]  
#include "stdafx.h" qZz?i  
#include "hook.h" !9ytZR*  
#include <windowsx.h> RAps`)OR?  
#ifdef _DEBUG 0l&#%wmJ,  
#define new DEBUG_NEW h~R= ?%H[  
#undef THIS_FILE a(BEm_l3  
static char THIS_FILE[] = __FILE__; M~jV"OF=  
#endif S%t*!  
#define MAX_KEY 100 *[SOz)  
#define CTRLBIT 0x04 P UJkC  
#define ALTBIT 0x02 Nxd<#p  
#define SHIFTBIT 0x01 { *&Wc Os  
#pragma data_seg("shareddata") y.PsC '  
HHOOK hHook =NULL; 5U!yc7eBI/  
UINT nHookCount =0; n?=d)[]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey fCa*#ME  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }cPH}[ $zF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "0ZBPp1q  
static int KeyCount =0; -h?ed'e/zz  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8pZGu8  
#pragma data_seg() lUJ~_`D  
HINSTANCE hins; `: R7j f  
void VerifyWindow(); 7I0[Ii  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S(\<@S&  
//{{AFX_MSG_MAP(CHookApp) w#Di  
// NOTE - the ClassWizard will add and remove mapping macros here. MJDW-KL-  
// DO NOT EDIT what you see in these blocks of generated code! 44p?x8(z*  
//}}AFX_MSG_MAP ZS\~GQbG  
END_MESSAGE_MAP() V^[B=|56  
EO: VH  
CHookApp::CHookApp() 8,DY0PGP  
{ e [ 9  
 // TODO: add construction code here, 2YV*U_\L  
 // Place all significant initialization in InitInstance (0W)Jd[  
} 9yrSCDu00  
e"@Ag:r@a  
CHookApp theApp; Un.u{$po  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W#@Mx  
{ V9dJNt'Ui  
 BOOL bProcessed=FALSE; 5_ \+8A*  
 if(HC_ACTION==nCode) V9%!B3Sb  
 { jMV9r-{*+  
  if((lParam&0xc0000000)==0xc0000000){// Key up -Y=o  
   switch(wParam) 94CHxv  
   { #i1z&b#@  
    case VK_MENU: |Y")$pjz  
     MaskBits&=~ALTBIT; "gCqb;^  
     break; WH6Bs=G\}  
    case VK_CONTROL: bAVlL&^@|  
     MaskBits&=~CTRLBIT; }F<=  
     break; B65"jy  
    case VK_SHIFT: k`u.:C&  
     MaskBits&=~SHIFTBIT; Fk*C8  
     break; cq#=Vb  
    default: //judge the key and send message u4QBD5T"  
     break; dum(T  
   } I #8TY/XP  
   for(int index=0;index<MAX_KEY;index++){ zS<idy F`  
    if(hCallWnd[index]==NULL) px>g  
     continue; #x|IEjoa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rxfhk,I  
    { .FWi$B';  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5%K(tRc|  
     bProcessed=TRUE; %~$coZY^  
    } kx.8VUoM V  
   } YM<F7tp4  
  } J7Y lmi  
  else if((lParam&0xc000ffff)==1){ //Key down 'i5,2vT0  
   switch(wParam) La 9:qpj  
   { hqwDlapTt  
    case VK_MENU: ?Fp2W+M j  
     MaskBits|=ALTBIT; p.@_3^#|  
     break; > %B7/l$  
    case VK_CONTROL: =f\BAi  
     MaskBits|=CTRLBIT; E WNm }C9  
     break; :)g}x&A^$  
    case VK_SHIFT: ,GTIpPj  
     MaskBits|=SHIFTBIT; }*>xSb1  
     break; 3Q\k!$zq  
    default: //judge the key and send message >9i%Yuy](  
     break; l/6$BP U`  
   } e]k\dj;,^%  
   for(int index=0;index<MAX_KEY;index++) ,E3Ze*(U  
   { ^EF VjGM  
    if(hCallWnd[index]==NULL) tYST&5Kh~  
     continue; |Zm'!-_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d: {#Dk#  
    { [+.P'6/[$R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z5q(  
     bProcessed=TRUE; c)B <d#  
    } 9JBVG~m+  
   } |:b!e  
  } >uy(N  
  if(!bProcessed){ Jnl#d0) -  
   for(int index=0;index<MAX_KEY;index++){ `Dp_c&9]  
    if(hCallWnd[index]==NULL) Fsi;[be$A  
     continue; D wtvtglqV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^"!)p2=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;9"6g=q  
   } Cj1nll8c  
  } :9Mqwgk,;3  
 } -*AUCns#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }F=lG-x  
} ,%4~ulKMn  
W)p?cK`  
BOOL InitHotkey() r[W Ir|r7  
{ sHn-#SGm  
 if(hHook!=NULL){  Ds@nuQ  
  nHookCount++; C]GW u~QF  
  return TRUE; [\,Jy8t)\  
 } </-aG[Fi  
 else a"bael  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ibL    
  if(hHook!=NULL) JthW"{E  
   nHookCount++; .\}nDT  
  return (hHook!=NULL); .z}*!   
} gBd@4{y6C.  
BOOL UnInit() dO!5` ]  
{ m>&:)K}m  
 if(nHookCount>1){ rfH Az  
  nHookCount--; 1|/-Ff"1@  
  return TRUE; -]!zj#&  
 } 2Mw^EjR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); CEEAyip-c  
 if(unhooked==TRUE){ Qf.]Mw?Bm  
  nHookCount=0; 3#Qek2  
  hHook=NULL; uB>OS 1=  
 } 6X[Mn2wYW  
 return unhooked; c#<p44>U  
} <&MY/vV  
F*J@OY8i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,]H2F']4Z  
{ 8/BWe ;4  
 BOOL bAdded=FALSE; 1T/ 72+R0  
 for(int index=0;index<MAX_KEY;index++){ s~n@|m9k  
  if(hCallWnd[index]==0){ ^udl&>  
   hCallWnd[index]=hWnd; 3u@=]0ZN  
   HotKey[index]=cKey; Xn # v!  
   HotKeyMask[index]=cMask; 9?.  
   bAdded=TRUE; (Y:?qy  
   KeyCount++; AZf$XHP2  
   break; +XoY@|Djd  
  } =kDh:&u%  
 } +Vw]DLWR  
 return bAdded; Y |'}VU  
} M=#'+CF}W  
vV*i)`IXe  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0.z\YTZ9  
{ MNu\=p\Eq  
 BOOL bRemoved=FALSE; s]'EIw}mo  
 for(int index=0;index<MAX_KEY;index++){ {2T;^+KE  
  if(hCallWnd[index]==hWnd){ D0VbD" y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6`V~cVu  
    hCallWnd[index]=NULL; d$#DXLA\P  
    HotKey[index]=0; YF6 8 Ax]  
    HotKeyMask[index]=0; Ac8t>;=&  
    bRemoved=TRUE; Mi:i1i cdn  
    KeyCount--; v18OUPPX  
    break; v!6IH  
   } F/w*[Xi Sh  
  } v/[*Pze,C  
 } &\L\n}i-  
 return bRemoved; Bh5z4  
} 2f0qfF  
H J0Rcw%  
void VerifyWindow() u}eLf'^ZCe  
{ #j4jZBOTM  
 for(int i=0;i<MAX_KEY;i++){ G^2%F5@  
  if(hCallWnd!=NULL){ ^ RIWW0  
   if(!IsWindow(hCallWnd)){ Apbgm[m|{  
    hCallWnd=NULL; RhD   
    HotKey=0; z#Db~  
    HotKeyMask=0; |"i"8~/@<  
    KeyCount--; 0@/C5 v  
   } rq![a};~  
  } 82KWe=  
 } /4{IxQk  
} vu|-}v?:  
-h%1rw  
BOOL CHookApp::InitInstance() 4gh` >  
{ O\q-Ai  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Tu&W7aoX5  
 hins=AfxGetInstanceHandle(); ufvjW]   
 InitHotkey(); !eA6Ejf  
 return CWinApp::InitInstance(); ?L+|b5RS  
} <m0m8p"G  
$8WeWmY  
int CHookApp::ExitInstance() Rg%Xy`gS  
{ ^7iP!-w/  
 VerifyWindow(); bBgyLyg  
 UnInit(); {4YD_$4W  
 return CWinApp::ExitInstance(); e {805^X}  
} X3R:^ff\  
p@[n(?duC.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +Y"HbNz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ra}t#Xt`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q=h37]U+  
#if _MSC_VER > 1000 Rgb&EnVW  
#pragma once =i:,")W7=  
#endif // _MSC_VER > 1000 {ug*  
-7(,*1Tk  
class CCaptureDlg : public CDialog d:JP935  
{ wj 15Og?  
 // Construction m_h$fT8 _  
 public: Wiere0 2*  
  BOOL bTray; }S 6h1X  
  BOOL bRegistered; PasVfC@  
  BOOL RegisterHotkey(); C"R}_C|r)*  
  UCHAR cKey; &x)nK  
  UCHAR cMask; >9,:i)m_  
  void DeleteIcon(); K8{ef  
  void AddIcon(); ui<Mnm_T;d  
  UINT nCount; y1#*c$ O  
  void SaveBmp(); ~ugH2jiB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y lhKP;  
  // Dialog Data bA\(oD+:  
  //{{AFX_DATA(CCaptureDlg) xwa@h}\#  
  enum { IDD = IDD_CAPTURE_DIALOG }; W<T Ui51Y  
  CComboBox m_Key; (kL(:P/  
  BOOL m_bControl; rAh|r}R  
  BOOL m_bAlt; ,*Wp$  
  BOOL m_bShift; %hi]oz  
  CString m_Path; &?Z<"+B8S  
  CString m_Number; P1dFoQz  
  //}}AFX_DATA hr`,s!0Y  
  // ClassWizard generated virtual function overrides KskPFXxP  
  //{{AFX_VIRTUAL(CCaptureDlg) 3*#$:waGd  
 public: hp$1c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); SS!b`  
 protected: 9gac7(2`)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support He1~27+99  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FB2{qG3  
  //}}AFX_VIRTUAL Wn&9R j  
  // Implementation =kjD ]+l  
 protected: : $N43_Wb  
  HICON m_hIcon; mNKcaM?h  
  // Generated message map functions aEn*vun  
  //{{AFX_MSG(CCaptureDlg) iHeu<3O  
  virtual BOOL OnInitDialog(); :;KQ]<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wQ?Z y;/S  
  afx_msg void OnPaint(); WXd#`f%  
  afx_msg HCURSOR OnQueryDragIcon(); ;jh.\a_\  
  virtual void OnCancel(); Oar%LSkPRz  
  afx_msg void OnAbout(); ,:% h`P_  
  afx_msg void OnBrowse(); {hVc,\A  
  afx_msg void OnChange(); :eFyd`Syw  
 //}}AFX_MSG ~~}8D"  
 DECLARE_MESSAGE_MAP() ]T._TZ"  
}; `$XgfMBf |  
#endif #6mr'e1  
xtK}XEhG!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6\USeZh  
#include "stdafx.h" @?5pY^>DK  
#include "Capture.h" @./ @"mR<  
#include "CaptureDlg.h" *0Wkz'=U  
#include <windowsx.h> J3hhh(  
#pragma comment(lib,"hook.lib") ??z&w`Yy,  
#ifdef _DEBUG ]0=THq\H  
#define new DEBUG_NEW sN ZOm$  
#undef THIS_FILE R0e!b+MZ.  
static char THIS_FILE[] = __FILE__; C:z7R" yj  
#endif IwR=@Ne8  
#define IDM_SHELL WM_USER+1 B$MHn?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UaBNoD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ls'8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; R'qBG(?i  
class CAboutDlg : public CDialog Y8for'  
{ ,qj M1xkL$  
 public: T;v^BVn  
  CAboutDlg(); S e|h]+G  
  // Dialog Data |8fdhqy_  
  //{{AFX_DATA(CAboutDlg) HG^~7oMf  
  enum { IDD = IDD_ABOUTBOX }; LBIEG_/m  
  //}}AFX_DATA l $0w 9Z^  
  // ClassWizard generated virtual function overrides _ME?o  
  //{{AFX_VIRTUAL(CAboutDlg) rh T!8dTk  
 protected: 74a k|(!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support * yGlX[  
  //}}AFX_VIRTUAL WnhH]WY  
  // Implementation Rm Q>.?  
 protected: ge#P(Itz  
  //{{AFX_MSG(CAboutDlg) 7-mo\jw<  
  //}}AFX_MSG *~^%s +b  
  DECLARE_MESSAGE_MAP() 5")BCA  
}; d>wG6Z,|  
:3D[~-/S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) cd] X5)$h  
{ dTqL[?wH?  
 //{{AFX_DATA_INIT(CAboutDlg) xP &@|Ag  
 //}}AFX_DATA_INIT W?0u_F  
} Hk?E0.  
y1#QP3'Z1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5uU{!JuSa  
{ E//*bmww  
 CDialog::DoDataExchange(pDX); 6>b'g ~I  
 //{{AFX_DATA_MAP(CAboutDlg) uzL|yxt  
 //}}AFX_DATA_MAP zLg_0r*h1  
} pIY3ft\  
ceAefKdb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ryn@">sVI  
 //{{AFX_MSG_MAP(CAboutDlg) a> S -50  
 // No message handlers $YK~7!!  
 //}}AFX_MSG_MAP ~>$z1o&}.  
END_MESSAGE_MAP() ' wKTWmf?\  
|sBL(9  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -v=tM6  
: CDialog(CCaptureDlg::IDD, pParent) |T{ZDJ+  
{ 5#::42oE  
 //{{AFX_DATA_INIT(CCaptureDlg) iOiXo6YE  
  m_bControl = FALSE; Hnf?`j>  
  m_bAlt = FALSE; Z|j\_VKhl  
  m_bShift = FALSE; p7[&H/  
  m_Path = _T("c:\\"); a KIS%M#Y  
  m_Number = _T("0 picture captured."); 4|NcWpaV7  
  nCount=0; 0$|wj^?U  
  bRegistered=FALSE; soqnr" 1  
  bTray=FALSE; i~tps  
 //}}AFX_DATA_INIT j&0t!f.Rv  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <<6gsKP  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); L>!MEMqm  
} ~TjTd  
`!.c_%m2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d{DBG}/Yg  
{ x)T07,3:  
 CDialog::DoDataExchange(pDX); U!T#'H5'-  
 //{{AFX_DATA_MAP(CCaptureDlg) Pcr;+'q  
  DDX_Control(pDX, IDC_KEY, m_Key); <9`/Y"\p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); RMa#z [{0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); vr$z6m ^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); M \>5",0  
  DDX_Text(pDX, IDC_PATH, m_Path); `7'=~BP?X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [H>/N7v19*  
 //}}AFX_DATA_MAP ,62BZyT,T,  
} 2Oy-jM  
Rr>""  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _? u} Jy_  
//{{AFX_MSG_MAP(CCaptureDlg) `;&=m, W'  
 ON_WM_SYSCOMMAND() =%wBC;  
 ON_WM_PAINT() cX5tx]  
 ON_WM_QUERYDRAGICON() E /V`NqC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  #uuNH(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #}xPOz7:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rH[Eh8j,  
//}}AFX_MSG_MAP A{Q~@1  
END_MESSAGE_MAP() #b{;)C fL  
g")pvK[e  
BOOL CCaptureDlg::OnInitDialog() g'V,K\TG  
{ 42 Sk`  
 CDialog::OnInitDialog(); LdyE*u_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =[o/D0-Kn  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0*o=JM]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 'Y5=A!*@tf  
 if (pSysMenu != NULL) 0WAOA6 _x  
 { BF]+fs`  
  CString strAboutMenu; UFUm-~x`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); rE\.[mFI  
  if (!strAboutMenu.IsEmpty())  34~[dY  
  { cS"PIelR  
   pSysMenu->AppendMenu(MF_SEPARATOR); {1W,-%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %$F\o1S  
  } sUsIu,1Q  
 } V _pKe~  
 SetIcon(m_hIcon, TRUE); // Set big icon 5@~5RNrq2  
 SetIcon(m_hIcon, FALSE); // Set small icon LU@+O12  
 m_Key.SetCurSel(0); R= *vPS  
 RegisterHotkey(); m`/!7wQs  
 CMenu* pMenu=GetSystemMenu(FALSE); &r V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); H$]FUv8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8wA'a'V.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); sg,9{R ^  
 return TRUE; // return TRUE unless you set the focus to a control 3<HPZWc  
} r;8$ 7C.  
P87qUC  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CB?,[#r5f  
{ ,T7(!)dR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) L!kbDbqn  
 { Ib$?[  
  CAboutDlg dlgAbout; ;EfREfk  
  dlgAbout.DoModal(); 3(La)|k  
 } !,PoH  
 else a5%IjgQ&z  
 { T8a!"lPP7  
  CDialog::OnSysCommand(nID, lParam); (1Ii86EP  
 } !6d`e"\K  
} )UG<KcdI  
MIwkFI8  
void CCaptureDlg::OnPaint() !,>9?(  
{ I`EgR?5 `  
 if (IsIconic()) PiwI.c  
 { !:Clzlg   
  CPaintDC dc(this); // device context for painting Q GDfX_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T13Jno  
  // Center icon in client rectangle .R {P%r  
  int cxIcon = GetSystemMetrics(SM_CXICON); B!z5P" C(~  
  int cyIcon = GetSystemMetrics(SM_CYICON); }4"T# [n#  
  CRect rect; F#Xzh Ds  
  GetClientRect(&rect);   |HB  
  int x = (rect.Width() - cxIcon + 1) / 2; 8Wyv!tL  
  int y = (rect.Height() - cyIcon + 1) / 2; I;Bcim;  
  // Draw the icon OAtn.LU  
  dc.DrawIcon(x, y, m_hIcon); *|k/lI  
 } i fbO<  
 else &(HIBF'O  
 { q3R?8Mb  
  CDialog::OnPaint(); ;yg9{"O  
 } 2:& [r*  
} 2u'h,on?  
"WHt9 yZ  
HCURSOR CCaptureDlg::OnQueryDragIcon() *Ldno`1O  
{ C8.MoFfhe  
 return (HCURSOR) m_hIcon; =qVD"Z]z  
} ?]u=5gqUU  
{H%1sI  
void CCaptureDlg::OnCancel() '; Z!(r  
{ `@|Kx\y4=j  
 if(bTray) ?AJE*=b  
  DeleteIcon(); 0^rDf L  
  CDialog::OnCancel(); QAh6!<.;@  
} j #)K/`  
6@o *"4~Q  
void CCaptureDlg::OnAbout() h ?%]uFJC  
{ xiG_l-2l  
 CAboutDlg dlg; DG"Z:^`*  
 dlg.DoModal(); 4I^8f||b_  
} C!}9[X!7@:  
u|]`gsFZ\  
void CCaptureDlg::OnBrowse() %t\ ~3pw=  
{ p8Wik<'^  
 CString str;  MUd 9R  
 BROWSEINFO bi; _ -/<bO  
 char name[MAX_PATH]; vL"[7'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); fbK`A?5K  
 bi.hwndOwner=GetSafeHwnd(); LdM9k(  
 bi.pszDisplayName=name; F[ 5\ x0  
 bi.lpszTitle="Select folder"; H '(Ky  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Bys_8x}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @fxDe[J:  
 if(idl==NULL)  @Iy&Qo  
  return; )~l`%+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @-QDp`QtI  
 str.ReleaseBuffer(); y6S:[Z{~A  
 m_Path=str; VaRP+J}UA.  
 if(str.GetAt(str.GetLength()-1)!='\\') N/&t) 7  
  m_Path+="\\"; 41V}6+$g  
 UpdateData(FALSE); +Qe&#"O0  
} Iz[T.$9  
B#U:6Ty  
void CCaptureDlg::SaveBmp() q!P{a^Fnc  
{ qKd&d  
 CDC dc; @ "=wn:O+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); g x~fZOF_  
 CBitmap bm; |}>;wZ[7  
 int Width=GetSystemMetrics(SM_CXSCREEN); \6U$kMGde  
 int Height=GetSystemMetrics(SM_CYSCREEN); !3'&_vmG$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @(m XiK  
 CDC tdc; `<:D.9vO "  
 tdc.CreateCompatibleDC(&dc); A(Ss:7({  
 CBitmap*pOld=tdc.SelectObject(&bm); _7LZ\V+MLW  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1Xi.OGl  
 tdc.SelectObject(pOld); zn@yt%PCV  
 BITMAP btm; AH#eoKu  
 bm.GetBitmap(&btm); =whYo?cE(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; l@zr1g)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -O?}-6,_Z  
 BITMAPINFOHEADER bih; `Mp-4)mn  
 bih.biBitCount=btm.bmBitsPixel; %IbG@ }54  
 bih.biClrImportant=0; Ce0YO~I  
 bih.biClrUsed=0; *U=%W4?W  
 bih.biCompression=0; D,H v(6({  
 bih.biHeight=btm.bmHeight; 8Ekk"h 6  
 bih.biPlanes=1; PHh&@:  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5#v|t\ {  
 bih.biSizeImage=size; C`0;  
 bih.biWidth=btm.bmWidth; M@/Hd0$  
 bih.biXPelsPerMeter=0; (;@\gRL  
 bih.biYPelsPerMeter=0; E5J2=xVW#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); G*;6cV19  
 static int filecount=0; eJ23$VM+9  
 CString name; Cg! ]x o  
 name.Format("pict%04d.bmp",filecount++); h NCoX*icd  
 name=m_Path+name; A#6\5u  
 BITMAPFILEHEADER bfh; "me a*-XB  
 bfh.bfReserved1=bfh.bfReserved2=0; S EeDq/h  
 bfh.bfType=((WORD)('M'<< 8)|'B'); eQRY xx{  
 bfh.bfSize=54+size; vF,iHzv  
 bfh.bfOffBits=54; +=/FKzT<  
 CFile bf; ny]R,D0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n(MVm-H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /.u0rxoRP}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >[ox|_o  
  bf.WriteHuge(lpData,size); ?Hd/!I&  
  bf.Close(); #&cNR_"w  
  nCount++; wA#w] 8SM  
 } 1[;~>t@C  
 GlobalFreePtr(lpData); 4/Yk;X[jk  
 if(nCount==1) 5fdB<& 9  
  m_Number.Format("%d picture captured.",nCount); XOe8(cXa9  
 else C;6Nu W  
  m_Number.Format("%d pictures captured.",nCount); fQ,L~:Y =  
  UpdateData(FALSE); rIt#ps  
} 8JU9Qb]L'I  
;m+*R/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Oa'DVfw2J  
{ ,L"1Ah  
 if(pMsg -> message == WM_KEYDOWN) h!L/ZeRaV  
 { AMhHq/Dw  
  if(pMsg -> wParam == VK_ESCAPE) m*d {pX  
   return TRUE; Yc,qXK-  
  if(pMsg -> wParam == VK_RETURN) dt -=7mz#  
   return TRUE; J AK+v  
 } f2JeXsOI  
 return CDialog::PreTranslateMessage(pMsg); &ZRriqsQg  
} EC4RA'Bg1k  
.qcIl)3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) POtj6 ?a  
{ Whd2mKwiO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H7 xyK  
  SaveBmp(); $#k8xb  
  return FALSE; ]d}U68$T+  
} %`cP|k  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B3lP#ckh  
 CMenu pop; m;S!E-W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); avb'J^}f  
 CMenu*pMenu=pop.GetSubMenu(0); BP6|^Q  
 pMenu->SetDefaultItem(ID_EXITICON); [LQD]#  
 CPoint pt; g.3a5#t  
 GetCursorPos(&pt); .<<RI8A  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2k}" 52  
 if(id==ID_EXITICON) P@m_tA%  
  DeleteIcon(); S<f]Y4A&  
 else if(id==ID_EXIT) J m5).  
  OnCancel(); fR& ;E  
 return FALSE; 6,707h  
} '9+JaB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }J~ d6m  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)   pE<@  
 AddIcon(); b=5"*=T{+  
 return res; |bwz  
} Lad8C  
vbo:,]T<A  
void CCaptureDlg::AddIcon() c==5cMUg  
{ !&$uq|-  
 NOTIFYICONDATA data; (^:0g.~c  
 data.cbSize=sizeof(NOTIFYICONDATA); ,[ UqUEO  
 CString tip; eCDwY:t`  
 tip.LoadString(IDS_ICONTIP); g9A8b(>F&@  
 data.hIcon=GetIcon(0); (V:z7  
 data.hWnd=GetSafeHwnd(); |# _F  
 strcpy(data.szTip,tip); J-6l<%962%  
 data.uCallbackMessage=IDM_SHELL; |L@&plyB-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m zh8<w?ns  
 data.uID=98; fd{75J5%  
 Shell_NotifyIcon(NIM_ADD,&data); qSg#:;(O  
 ShowWindow(SW_HIDE); rjFIK`_w  
 bTray=TRUE; 3tO=   
} k$kOp *X  
4@iMGYR9!s  
void CCaptureDlg::DeleteIcon() =N62 ){{  
{ (;9-8Y&_d  
 NOTIFYICONDATA data; $ ]ew<j  
 data.cbSize=sizeof(NOTIFYICONDATA); y@#JzfY?Hr  
 data.hWnd=GetSafeHwnd(); %j.B/U$  
 data.uID=98; @>r3=s.Q  
 Shell_NotifyIcon(NIM_DELETE,&data); gQ < >S  
 ShowWindow(SW_SHOW); * LaL('.>  
 SetForegroundWindow(); ma +iIt;  
 ShowWindow(SW_SHOWNORMAL); 1BA/$8G  
 bTray=FALSE; Ihd{ @6m  
} 3Kx&+  
=bx;TV  
void CCaptureDlg::OnChange() TpB4VNi/<  
{ #2/2X v  
 RegisterHotkey(); 88@" +2  
} :7WeR0*%  
Y#VtZTcT  
BOOL CCaptureDlg::RegisterHotkey() eWN[EJI<  
{ {Wi)/B}  
 UpdateData(); >/r^l)`9_f  
 UCHAR mask=0; =t/ "&[r  
 UCHAR key=0; rZij[6]Y^  
 if(m_bControl) % `4\ 8H`  
  mask|=4; ;?{N=x8  
 if(m_bAlt) *%3%Zj,{  
  mask|=2; 'ie+/O@G  
 if(m_bShift) ?~%Go  
  mask|=1; tdCD!rV`{  
  key=Key_Table[m_Key.GetCurSel()]; TFQX}kr]  
 if(bRegistered){ b1*5#2rs.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); C[-M ~yIL  
  bRegistered=FALSE; Jq5](F!z  
 } K P1;u#v  
 cMask=mask; ^69ZX61vt  
 cKey=key; 8\N`2mPt  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >FR;Ux~a  
 return bRegistered; A-&'/IHR"B  
} )YtdU(^J$  
?;bsg 9  
  四、小结 JO3x#1~;_  
6h5,XcO4  
  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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