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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: 0D^c4[Y'l  
  pq<2:F:Kl  
  一、实现方法 {~~'  
iea7*]vW  
  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: (&-!l2  
]s^Pw>/`  
#pragma data_seg("shareddata") '&Tq/;Ml  
HHOOK hHook =NULL; //钩子句柄 iKe68kx  
UINT nHookCount =0; //挂接的程序数目 #P-T4 R  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |C.[eHe&D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 eR:!1z_h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "|K D$CY  
static int KeyCount =0; DzG$\%G2R}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +p_>fO  
#pragma data_seg() mpDQhD[n  
aA&}=lm  
  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。 =F90SyzTy  
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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: =&v&qn e9  
]sV) '-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR CC{{@  
cKey,UCHAR cMask) ev%}\^Vl[  
{ 8/+x1,S%  
 BOOL bAdded=FALSE; aj@<4A=;  
 for(int index=0;index<MAX_KEY;index++){ j\@osjUu  
  if(hCallWnd[index]==0){ 'mU7N<Q$qQ  
   hCallWnd[index]=hWnd; {qPu }?0  
   HotKey[index]=cKey; 9|1J pb  
   HotKeyMask[index]=cMask; *WZ?C|6+  
   bAdded=TRUE; IRB BLXv7\  
   KeyCount++; }C9P--  
   break; Rkz[x  
  } Sv|jR r'  
 } '7/c7m/$X<  
 return bAdded; W)m\q}]FYz  
} X1~ WQ?ww  
//删除热键 0N4+6k|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m<| *  
{ i[a1ij=  
 BOOL bRemoved=FALSE; @DA.$zn&  
 for(int index=0;index<MAX_KEY;index++){ =/L;}m)7  
  if(hCallWnd[index]==hWnd){ $VyH2+ jC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V [r1bF  
    hCallWnd[index]=NULL; Pvu*Y0_p  
    HotKey[index]=0; O2C&XeB:4  
    HotKeyMask[index]=0; 4Q n5Mr@<  
    bRemoved=TRUE; 2g:V_%  
    KeyCount--; )6 [d'2  
    break; #a=~a=c(^  
   } Z2hIoCT  
  } S|v")6  
 } {/PiX1mn  
 return bRemoved; e95@4f^K2  
} Ob>M]udn  
hTK6N  
M|uWSG  
  DLL中的钩子函数如下: /$?7L(  
-/ h'uG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !Xf7RT  
{ ?PST.+l  
 BOOL bProcessed=FALSE; eIY![..J/N  
 if(HC_ACTION==nCode) h!h<!xaclW  
 { :~{x'`czJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v'H\KR-;  
   switch(wParam) OVgx2_F  
   {  a.!|A(zw  
    case VK_MENU: %$H~  
     MaskBits&=~ALTBIT; ~AbTbQ3  
     break; 'SE?IE{  
    case VK_CONTROL: BARs1^pR4  
     MaskBits&=~CTRLBIT; leomm+f^  
     break; y( uE  
    case VK_SHIFT: ej&ZE n  
     MaskBits&=~SHIFTBIT; La#otuw+?  
     break; ZVX!=3VT  
    default: //judge the key and send message 5zR9N>!c  
     break; f+iM_MI  
   } Vv3{jn6%  
   for(int index=0;index<MAX_KEY;index++){ +U];  
    if(hCallWnd[index]==NULL) 9 9S-P}xd  
     continue; `U[s d*C"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?ta(`+"  
    { '2BE"e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {Mx3G*hr  
     bProcessed=TRUE; 8O0E;6b  
    } -^+!:0';  
   } NT}r6V(Aju  
  } ~99DE78  
  else if((lParam&0xc000ffff)==1){ //有键按下 :M'V**A(  
   switch(wParam) tV5U z&:b  
   { {3{cU#\QA  
    case VK_MENU: c[QXc9  
     MaskBits|=ALTBIT; 8#&axg?a  
     break; #\X="' /  
    case VK_CONTROL: Yl!~w:O!o  
     MaskBits|=CTRLBIT; + IpC  
     break; xesZ 7{ o  
    case VK_SHIFT: \vQjTM-7  
     MaskBits|=SHIFTBIT; v;m}<3@'  
     break; tjIT4  
    default: //judge the key and send message Yf=Puy}q  
     break; 3Sb'){.MT+  
   } , e6}p  
   for(int index=0;index<MAX_KEY;index++){ //_aIp  
    if(hCallWnd[index]==NULL) h<8.0  
     continue; ?rG>SA>o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q V +gQ  
    { D3BT>zTGK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d5O_~x f&  
     bProcessed=TRUE; rbw5.NU  
    } JL1z8Nu  
   } eub2[,  
  } 'ixu+.ZL/  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 VkChRzhC  
   for(int index=0;index<MAX_KEY;index++){ 1>"[b8a/  
    if(hCallWnd[index]==NULL) jjLwHJ  
     continue; h &R1"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,|r%tNh<8$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D#I^;Xg0h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 E0o?rgfdq  
   } 1!4-M$-  
  } ?=\&O=_ln  
 } 5i42o+'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i G%h-  
} Cj6+zJ  
+4Uxq{.K  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: l9"T"9C{  
8UahoNrSt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r%^l~PN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gec?  
^[]@dk9  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ~dFdO7  
d@?++z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h/a|-V}m&  
{ hhU: nw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j~Cch%%G  
 { <HC5YA)4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 w#!^wN  
  SaveBmp(); zc n/LF  
  return FALSE; 1"4Pan  
 } -J<{NF  
 …… //其它处理及默认处理 ev}ugRxt|k  
} &eqeQD6  
*49lM;  
[$<\*d/  
  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。 ..5rW0lr  
(&)PlIi7  
  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。 4|#@41\ B  
jrKRXS  
  二、编程步骤 UbnX%2TW  
Hido[  
  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"; 1YrIcovi-  
Z Vin+z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2`?58&  
ip`oL_c  
  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; jrl'?`O  
EL?6x  
  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; qZS]eQW.  
@3Lh/&  
  5、 添加代码,编译运行程序。 Yi5^# G  
Gz,?e]ZV  
三、程序代码 @> ]O6P2  
;;zQVD )X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5S EyAhB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ; m]KKB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ , Y\`n7Ww  
#if _MSC_VER > 1000 +' lj\_n  
#pragma once fQkfU;5  
#endif // _MSC_VER > 1000 L xg,BZV  
#ifndef __AFXWIN_H__ ]"2;x  
#error include 'stdafx.h' before including this file for PCH C2[* $ 1U  
#endif .EF(<JC?  
#include "resource.h" // main symbols b5u8j  
class CHookApp : public CWinApp @  gv^  
{ WE*L=_zDS  
 public: /qd5{%:  
  CHookApp(); UBm L:Qv  
  // Overrides +'ZJ]  
  // ClassWizard generated virtual function overrides >OLKaghV.5  
  //{{AFX_VIRTUAL(CHookApp) XjRk1 ~  
 public: Biva{'[m  
  virtual BOOL InitInstance(); RI[=N:C^  
  virtual int ExitInstance(); A%[ BCY_  
  //}}AFX_VIRTUAL s.#%hPX{  
  //{{AFX_MSG(CHookApp) |}-bMQ|  
  // NOTE - the ClassWizard will add and remove member functions here. L*QX21@wC  
  // DO NOT EDIT what you see in these blocks of generated code ! zarxv| }$  
  //}}AFX_MSG BWWO=N  
  DECLARE_MESSAGE_MAP() KmYSYNr@,  
}; )9]DJ!]&Q"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <y}9Twdy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l 10p'9 n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g5OKhL0u  
BOOL InitHotkey(); x%!Ea{ s  
BOOL UnInit(); 2&,jO+BqE@  
#endif tpY]Mz[J  
v><c@a=[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9*&c2jh  
#include "stdafx.h" /TndB7l"3  
#include "hook.h" [XKudw%  
#include <windowsx.h> t4P`#,:8  
#ifdef _DEBUG xk:=.Qqh  
#define new DEBUG_NEW GGQ%/i]:  
#undef THIS_FILE %6%~`((4  
static char THIS_FILE[] = __FILE__; Pss$[ %  
#endif b4R;#rm  
#define MAX_KEY 100 3OlXi9>3  
#define CTRLBIT 0x04 z]%c6ty  
#define ALTBIT 0x02 mM$|cge"  
#define SHIFTBIT 0x01 ^5D%)@~  
#pragma data_seg("shareddata") &}y?Lt  
HHOOK hHook =NULL; _ g8CvH)?!  
UINT nHookCount =0; E-`3}"{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p=jpk@RX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #lY_XV.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey VRs|";  
static int KeyCount =0; x<'<E@jpU;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]J(BaX4  
#pragma data_seg() @PZ{(  
HINSTANCE hins; 3!u`PIQv  
void VerifyWindow(); wU5.t -|`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T2ZB(B D  
//{{AFX_MSG_MAP(CHookApp) +L,V_z  
// NOTE - the ClassWizard will add and remove mapping macros here. +7KRoF|  
// DO NOT EDIT what you see in these blocks of generated code! yp!7^  
//}}AFX_MSG_MAP 1s_N!a  
END_MESSAGE_MAP() ZamOYkRX  
Nrn_Gy>|D  
CHookApp::CHookApp() ;Zy[2M  
{ q21l{R{Y  
 // TODO: add construction code here, ;TC"n!ew  
 // Place all significant initialization in InitInstance PNs*+/-S  
} Xmm) z  
4~K%,K+Du  
CHookApp theApp; LG+2?+tE"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ab In\,x  
{ fpa ~~E-  
 BOOL bProcessed=FALSE; w$DHMpW'  
 if(HC_ACTION==nCode) 4o<rj4G>  
 { #I"s{*  
  if((lParam&0xc0000000)==0xc0000000){// Key up _M) G  
   switch(wParam) jcbq#  
   { F;L8FL-  
    case VK_MENU: 'N3)>!Y:8  
     MaskBits&=~ALTBIT; Fy$f`w_H@  
     break; 2 oo/KndU  
    case VK_CONTROL: `tPVNO,l  
     MaskBits&=~CTRLBIT; (2Z k fN  
     break; ='t}d>l  
    case VK_SHIFT: M5kw3Jy5  
     MaskBits&=~SHIFTBIT; gkmV; 0  
     break; 1N}vz(0"  
    default: //judge the key and send message eBWgAf.k  
     break; 4q"4N2  
   } ~Z~V:~  
   for(int index=0;index<MAX_KEY;index++){ o1?S*  
    if(hCallWnd[index]==NULL) :2.<JUDM  
     continue; 0T7t.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rc vp@  
    { ij,Rq`}l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v&qL r+_7  
     bProcessed=TRUE; WDi2m"  
    } |->C I  
   } D&{CC  
  } T I|h  
  else if((lParam&0xc000ffff)==1){ //Key down zP&D  
   switch(wParam) =NmW}x|n  
   { mxE<  
    case VK_MENU: cgi:"y F  
     MaskBits|=ALTBIT; b_X&>^4Dkl  
     break; \(MI DCZ@-  
    case VK_CONTROL: Ew JNpecX  
     MaskBits|=CTRLBIT; :,ucJ|  
     break; L54]l^ls>  
    case VK_SHIFT: 61w ({F  
     MaskBits|=SHIFTBIT; b Rc,Y<  
     break; n?778Wo}  
    default: //judge the key and send message _G&gF .|  
     break; M-Ek(K3SRf  
   } ^I KT!"J&?  
   for(int index=0;index<MAX_KEY;index++) edo+ o{^  
   { nMK$&h,{  
    if(hCallWnd[index]==NULL) fx-8mf3  
     continue; Z2t\4|wr:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f`)*bx  
    { BwkY;Ur/AL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K)9Rw2-AJ  
     bProcessed=TRUE; JOz4O  
    } pMJm@f  
   } |BUgsE  
  } @,j,GE%  
  if(!bProcessed){ S=gb y  
   for(int index=0;index<MAX_KEY;index++){ O0FUJGuTS  
    if(hCallWnd[index]==NULL) wB bCGU  
     continue; 3RanAT.nu:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pC]XbokES  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Re2&qxE  
   } Qvty;2$o@  
  }  fDloL  
 } 'b0r?A~c=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Cs(sar:7  
} @C<ofg3E  
:..WL;gC  
BOOL InitHotkey() 5DDSo0E  
{ SK#&%Yk  
 if(hHook!=NULL){ \%7fm#z6  
  nHookCount++; '#XT[\  
  return TRUE; 9a @rsyX  
 } sopf-g:  
 else @mJ~?d95v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Mg2e0}{  
  if(hHook!=NULL) z)(W x">  
   nHookCount++; )3)7zulnXH  
  return (hHook!=NULL); L+*:VP6WD  
} R+U$;r8l  
BOOL UnInit() hbg$u$1`,  
{ /wax5FS'I,  
 if(nHookCount>1){ @H<*|3J  
  nHookCount--; ' '(rC38  
  return TRUE; u>]3?ty`  
 } m8;w7S7,j~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |Iwglb!k  
 if(unhooked==TRUE){ |lcp (u*u  
  nHookCount=0; `/Rqt+C  
  hHook=NULL; , /%'""`w  
 } J&s$Wqf  
 return unhooked; ^vPsp?  
} Rpv[rvK'  
0-[naGz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ? 3OfiGX?  
{ Xi1|%  
 BOOL bAdded=FALSE; `IEA  
 for(int index=0;index<MAX_KEY;index++){ haY]gmC  
  if(hCallWnd[index]==0){ _-lE$ O  
   hCallWnd[index]=hWnd; Aj|->Y  
   HotKey[index]=cKey; |g.CS$'#Nt  
   HotKeyMask[index]=cMask; 33EF/k3vW  
   bAdded=TRUE; Av?R6  
   KeyCount++; <zL_6Y2  
   break; 3LT~- SvL  
  } w|6/i/X  
 } 8>t,n,k  
 return bAdded; pY@QR?F\  
} !6 L!%Oi  
1f<R,>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #G.eiqh$a  
{ A[8m3L#k  
 BOOL bRemoved=FALSE; E]rXp~AZm  
 for(int index=0;index<MAX_KEY;index++){ u5Vgi0}A  
  if(hCallWnd[index]==hWnd){ TIxOMYy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I`_I^C3  
    hCallWnd[index]=NULL; Y X^c}t}U  
    HotKey[index]=0; [8a(4]4  
    HotKeyMask[index]=0; e.skE>&  
    bRemoved=TRUE; |$b8(g$s)  
    KeyCount--; y^,QM[&  
    break; '.1P\>x!]  
   } QM#Vl19>j(  
  } 6e rYjq  
 } 2 4+  
 return bRemoved; ^8;MY5Wbs  
} #|ts1lD#ah  
NJQ)Ttt  
void VerifyWindow() Sz@z 0'  
{ T{k_3[{0o  
 for(int i=0;i<MAX_KEY;i++){ Gk{ 'U  
  if(hCallWnd!=NULL){ VaY#_80$s  
   if(!IsWindow(hCallWnd)){ k9f|R*LM  
    hCallWnd=NULL; 5, ,~k=  
    HotKey=0; |y[I!JdR  
    HotKeyMask=0; V:Gy pY)  
    KeyCount--; A4!X{qUT-  
   } 6{buel(|e  
  } b9RHsr]V  
 } }q`9U!v  
} X'jyR:ut#  
<@"rI>=  
BOOL CHookApp::InitInstance() Vf&U`K  
{ D9[19,2r`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1oej<67PdJ  
 hins=AfxGetInstanceHandle(); I09 W=  
 InitHotkey(); O{_t*sO9q*  
 return CWinApp::InitInstance(); < j:\;mi;  
} u"=]cBRWL6  
j*<J&/luYZ  
int CHookApp::ExitInstance() <7VLUk}  
{ xeSch?}  
 VerifyWindow(); W|m(Jh[w]  
 UnInit(); AQUAQZc  
 return CWinApp::ExitInstance(); Yi%lWbr  
} (|K+1R  
<Z:FY|'s  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SK\@w9#&$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @  W>@6E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =|]h-[P'  
#if _MSC_VER > 1000 FC] *^B  
#pragma once %-blx)Pc  
#endif // _MSC_VER > 1000 N:)x67,  
EL$DvJ~  
class CCaptureDlg : public CDialog <#h,_WP*  
{ z3uR1vF'  
 // Construction TQT3]h6  
 public: bO\++zOF  
  BOOL bTray; ^x\VMd3*w  
  BOOL bRegistered; P+o"]/7U  
  BOOL RegisterHotkey(); |CDM(g>%  
  UCHAR cKey; /AD&z?My+E  
  UCHAR cMask; j~k,d.17M  
  void DeleteIcon(); /e0B$UymFu  
  void AddIcon(); dn#I,xa`  
  UINT nCount; #{}?=/nJ~-  
  void SaveBmp(); (<eLj Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor N l@G\_  
  // Dialog Data iAk:CJ{  
  //{{AFX_DATA(CCaptureDlg) 9jTBLp-i#N  
  enum { IDD = IDD_CAPTURE_DIALOG }; ->b5"{t  
  CComboBox m_Key; v`Jt+?I  
  BOOL m_bControl; "Xv} l@  
  BOOL m_bAlt; 9 8|sWI3 B  
  BOOL m_bShift; o1ZVEvp  
  CString m_Path; %^@l5h.lqB  
  CString m_Number; ^YLC{V  
  //}}AFX_DATA o9 9ExQ.  
  // ClassWizard generated virtual function overrides ,%TBW,>  
  //{{AFX_VIRTUAL(CCaptureDlg) B?z2@,  
 public: 8OZj24*'DS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <-v zS;  
 protected: m[}k]PB>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ic2?1<IZA  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); r E+B}O  
  //}}AFX_VIRTUAL .t_t)'L  
  // Implementation 5G`HJ6  
 protected: hI:.Qp`r  
  HICON m_hIcon; ']1n?K=A  
  // Generated message map functions IE`3I#v  
  //{{AFX_MSG(CCaptureDlg) r%.k,FzGZY  
  virtual BOOL OnInitDialog(); 0V1GX~2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TmG);B}  
  afx_msg void OnPaint(); 7%Y`j/  
  afx_msg HCURSOR OnQueryDragIcon(); +-j-)WU?,  
  virtual void OnCancel(); V'&;r'#O  
  afx_msg void OnAbout(); &>zH.6%$  
  afx_msg void OnBrowse(); YCbvCw$Ob  
  afx_msg void OnChange(); sG`x |%t  
 //}}AFX_MSG X<L=*r^C,=  
 DECLARE_MESSAGE_MAP() >9{?&#]x  
}; SY +0~5E  
#endif f kZHy|m  
I_r@Y:5{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Me .I>7c  
#include "stdafx.h" s(=wG|   
#include "Capture.h" G!Zb27u+  
#include "CaptureDlg.h" 5bLNQz\WJ  
#include <windowsx.h> 1p}H,\o  
#pragma comment(lib,"hook.lib") oV vA`}  
#ifdef _DEBUG j L|6i-?!  
#define new DEBUG_NEW .^wpfS  
#undef THIS_FILE c<_%KL&R  
static char THIS_FILE[] = __FILE__; |UB$^)Twb  
#endif /3ohm|!rW  
#define IDM_SHELL WM_USER+1 hTtn /j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JY"jj}H]|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,.<mj !YE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [./FzlAs  
class CAboutDlg : public CDialog f;{Q ~  
{ 1CB&z@  
 public: 3+6Ed;P  
  CAboutDlg(); 1p}Wj*mc  
  // Dialog Data v&d1ACctJ  
  //{{AFX_DATA(CAboutDlg) 5%I3eL%s  
  enum { IDD = IDD_ABOUTBOX }; 1"H;Tr|  
  //}}AFX_DATA .?45:Ey~g  
  // ClassWizard generated virtual function overrides QOB^U-cW  
  //{{AFX_VIRTUAL(CAboutDlg) NI s7v  
 protected: Gm|-[iUTG]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]=~dyi  
  //}}AFX_VIRTUAL 8gS7$ EH'  
  // Implementation zgwez$  
 protected: <F7a!$zQ  
  //{{AFX_MSG(CAboutDlg) ' h7Faj  
  //}}AFX_MSG QF>T)1&J[7  
  DECLARE_MESSAGE_MAP() ;QBS0x\f@  
}; : "85w#r  
s)E  \  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }X)vktE+|  
{ 296}LW  
 //{{AFX_DATA_INIT(CAboutDlg) sycAAmH<  
 //}}AFX_DATA_INIT yqx5_}  
} `;UWq{"  
 pQiC#4b  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]DNPG"  
{ ]}v]j`9m%  
 CDialog::DoDataExchange(pDX); b}K,wAx  
 //{{AFX_DATA_MAP(CAboutDlg) ?4b0\ -  
 //}}AFX_DATA_MAP -Uo11'{  
} FP=B/!g  
1wR[nBg*|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oXm !  
 //{{AFX_MSG_MAP(CAboutDlg) IXy6Yn9l  
 // No message handlers oqJ Ybim  
 //}}AFX_MSG_MAP EOB8|:*  
END_MESSAGE_MAP() b > D  
/s4~Ij`be  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %B$ftsYXmu  
: CDialog(CCaptureDlg::IDD, pParent) RIMSXue*Ha  
{ I8bM-k):9R  
 //{{AFX_DATA_INIT(CCaptureDlg) X FS~  
  m_bControl = FALSE; (tg.]q_=u  
  m_bAlt = FALSE; 0-Mzb{n5  
  m_bShift = FALSE; +M-tYE 5n  
  m_Path = _T("c:\\"); `\UY5n72  
  m_Number = _T("0 picture captured."); &e^;;<*w  
  nCount=0; zZ%[SW&vC  
  bRegistered=FALSE; tj13!Cc}e`  
  bTray=FALSE; ,:t,$A  
 //}}AFX_DATA_INIT Z*k(Q5&U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k'o[iKlu  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (ghI$oH  
} Lwl1ta-  
-EiTP:A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) J p?XV<3Z  
{ h.EI(Ev"GN  
 CDialog::DoDataExchange(pDX); E{\CE1*  
 //{{AFX_DATA_MAP(CCaptureDlg) $lxpwO  
  DDX_Control(pDX, IDC_KEY, m_Key); gC1LQ!:;Oi  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); k6b ct@7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >$D!mraih  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); eAlOMSL\  
  DDX_Text(pDX, IDC_PATH, m_Path); \;&;K'   
  DDX_Text(pDX, IDC_NUMBER, m_Number); &E&~9"^hQL  
 //}}AFX_DATA_MAP Blxa0&3  
} od)TQSo  
&s".hP6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3x;UAi+&  
//{{AFX_MSG_MAP(CCaptureDlg) cUR :a @  
 ON_WM_SYSCOMMAND() ~(R=3  
 ON_WM_PAINT() 5 bI :xL}  
 ON_WM_QUERYDRAGICON() So 1TH%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `58%&3lp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Yz/Blh%V  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^\ [p6>  
//}}AFX_MSG_MAP leC!Yj  
END_MESSAGE_MAP() R/~!km  
t.( `$  
BOOL CCaptureDlg::OnInitDialog() n#">k%bD  
{ 2d .$V,U<  
 CDialog::OnInitDialog(); *Ypn@YpSp  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); " aG6u^%  
 ASSERT(IDM_ABOUTBOX < 0xF000); (  cs  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >?@5>wF  
 if (pSysMenu != NULL) P*&[9 )d6  
 { 'FXM7D   
  CString strAboutMenu; jYVs\h6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H7+"BWc  
  if (!strAboutMenu.IsEmpty()) bWo  
  { M_E,pg=rWI  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3'z$@ ;Ev+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7ui<2(W@0  
  } 7fR5V  
 } YZf{."Opj[  
 SetIcon(m_hIcon, TRUE); // Set big icon Jw]!x1rF~  
 SetIcon(m_hIcon, FALSE); // Set small icon W:i Q& [f  
 m_Key.SetCurSel(0); RhowhQ)G  
 RegisterHotkey(); c]M+|R5  
 CMenu* pMenu=GetSystemMenu(FALSE); cp Ot?XYR~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); rCw 4a?YS  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xe_ <]|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5=?P 6I_$G  
 return TRUE; // return TRUE unless you set the focus to a control ,?8a3%  
} 0 PYYG  
Cu+p!hV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) sx#O3*'>1  
{ 8!2)=8|f  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d_`MS@2  
 { k{+cFG\C&  
  CAboutDlg dlgAbout; !gkr?yhE  
  dlgAbout.DoModal(); #f#6u2nF\  
 } L/u|90) L  
 else %r[`HF>  
 { $ +WXM$N  
  CDialog::OnSysCommand(nID, lParam); ?^~ZsOd8B  
 } }`w(sec:3  
} 8xlj,}QO\  
VZqCFE3  
void CCaptureDlg::OnPaint() #m U\8M,  
{ b:S$oE  
 if (IsIconic()) 9?\cm}^?  
 { ^ |MS2'  
  CPaintDC dc(this); // device context for painting *)Pm   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Vo"G@W)lZ  
  // Center icon in client rectangle EGD{nE  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4 ?BQ&d  
  int cyIcon = GetSystemMetrics(SM_CYICON); e`0C0GaP  
  CRect rect; XNa{_3v  
  GetClientRect(&rect); 51ViJdZ  
  int x = (rect.Width() - cxIcon + 1) / 2; 3V]dl)en%  
  int y = (rect.Height() - cyIcon + 1) / 2; V=ll 9M  
  // Draw the icon 9y7hJib  
  dc.DrawIcon(x, y, m_hIcon); w,IJ44f ^%  
 } Vs"b  
 else P.YT/  
 { {gzQ/|}#z-  
  CDialog::OnPaint(); I;@q`Tm  
 } tpS gbGzp  
} 9Buss+K?/h  
5 SQ!^1R 9  
HCURSOR CCaptureDlg::OnQueryDragIcon() e;vI XJE  
{ G+=G c(J  
 return (HCURSOR) m_hIcon; bg|$1ue  
} K["rr/  
T}!9T!(HdF  
void CCaptureDlg::OnCancel() uT]$R  
{ le^Fik   
 if(bTray) L$Z!  
  DeleteIcon(); q!W,2xqZoq  
  CDialog::OnCancel(); pS8\B  
} -+){;,  
YAXd   
void CCaptureDlg::OnAbout() F(1E@xs  
{ CY?J$sN  
 CAboutDlg dlg; pq0Z<b;2  
 dlg.DoModal(); MZ%J ]Nd  
} H^Pq[3NQ  
JX'}+.\  
void CCaptureDlg::OnBrowse() i3 XtrP""  
{ 0-PT%R  
 CString str; 9z4F/tUq  
 BROWSEINFO bi; ~0CNCP  
 char name[MAX_PATH]; r~=+>, _  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Sck!w 3  
 bi.hwndOwner=GetSafeHwnd(); $l)RMP}  
 bi.pszDisplayName=name; to13&#o  
 bi.lpszTitle="Select folder"; !9gpuS[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^%*qe5J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); HCr}|DxyK  
 if(idl==NULL) Ip{hg,>  
  return; # N3*SE  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hg12NzbK  
 str.ReleaseBuffer(); y:\<FLR}j  
 m_Path=str; T} \>8EEG  
 if(str.GetAt(str.GetLength()-1)!='\\') 1]>JMh%X9t  
  m_Path+="\\"; 2L^/\!V#  
 UpdateData(FALSE); Hd4 ~v0eS  
} \ MuKS4  
HpbwW=;V  
void CCaptureDlg::SaveBmp() MZV bOcSAd  
{ 3^Is4H_8  
 CDC dc; +Q"s!\5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); oG22;  
 CBitmap bm; 4grV2xtX  
 int Width=GetSystemMetrics(SM_CXSCREEN); PU ea`rE?R  
 int Height=GetSystemMetrics(SM_CYSCREEN); [W$x5|Z}Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @<P;F  
 CDC tdc; NjS<DzKhK  
 tdc.CreateCompatibleDC(&dc); rG-x 3>b  
 CBitmap*pOld=tdc.SelectObject(&bm); gRs @T<k2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q$Qr)mcC  
 tdc.SelectObject(pOld); &: LE]w  
 BITMAP btm; LB7$&.m'B  
 bm.GetBitmap(&btm); CZy!nR!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0XE6H w  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); JWu0VLo  
 BITMAPINFOHEADER bih; 0(5qVJ12  
 bih.biBitCount=btm.bmBitsPixel; 3#fg 2  
 bih.biClrImportant=0; e}gGl<((g  
 bih.biClrUsed=0; \Ogs]4   
 bih.biCompression=0; E08!a  
 bih.biHeight=btm.bmHeight; r 'ioH"=  
 bih.biPlanes=1; ?/3{gOgI$`  
 bih.biSize=sizeof(BITMAPINFOHEADER); </9c=GoJ  
 bih.biSizeImage=size; H(?+-72KX  
 bih.biWidth=btm.bmWidth; ty;a!yjC  
 bih.biXPelsPerMeter=0; ,o2x,I  
 bih.biYPelsPerMeter=0; JWM4S4yZHR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <YG 42,N  
 static int filecount=0; /L`qOr2E  
 CString name; i @M^l`w  
 name.Format("pict%04d.bmp",filecount++); uf )!SxT  
 name=m_Path+name; ME*zMLoF+  
 BITMAPFILEHEADER bfh; cor!Sa>  
 bfh.bfReserved1=bfh.bfReserved2=0; d<] eJ{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |em_l$oGc  
 bfh.bfSize=54+size; laCVj6Rk  
 bfh.bfOffBits=54; ?MRT  
 CFile bf; 2zsDb'r  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $*fEgU% c  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TD;u"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7CU<R9Kl  
  bf.WriteHuge(lpData,size); 6C_H0a/h&  
  bf.Close(); j%S} T)pX  
  nCount++; !{r@ H+Kf  
 } Ta8lc %0w3  
 GlobalFreePtr(lpData); F6{Q1DqI  
 if(nCount==1) #cl|5jm+m#  
  m_Number.Format("%d picture captured.",nCount); 2Zq_zvKUt  
 else KWVl7Kw#e  
  m_Number.Format("%d pictures captured.",nCount); (^|vN ;  
  UpdateData(FALSE); 6 #jpA.;  
} 0d,&)  
!&G& ~*.x  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p1s& y0:d  
{ GQ9H>Ssz  
 if(pMsg -> message == WM_KEYDOWN) -C* UB  
 { qaBL  
  if(pMsg -> wParam == VK_ESCAPE) X5)].[d  
   return TRUE; TwZmZE ?!  
  if(pMsg -> wParam == VK_RETURN) F PAj}as  
   return TRUE; lt C  
 } l5Q-M{w0x  
 return CDialog::PreTranslateMessage(pMsg); 7@!ne&8Z?  
} V?C a[  
%vWh1-   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #"JtH"pF  
{ !y;xt?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /:w.Zf>B9  
  SaveBmp(); .Nd_p{   
  return FALSE; QL@}hw.F  
} K"=I,Vr:  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /n1H; ~f]  
 CMenu pop; -[A=\]RfJ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x1.yi-  
 CMenu*pMenu=pop.GetSubMenu(0); Z=144n 1  
 pMenu->SetDefaultItem(ID_EXITICON); g/z7_Aq/  
 CPoint pt; C1(0jUz  
 GetCursorPos(&pt); J+nUxF;EE  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); V%w]HIhq  
 if(id==ID_EXITICON) x)2ZbIDB:"  
  DeleteIcon(); \ci[<CP  
 else if(id==ID_EXIT) =(as{,j  
  OnCancel(); lT- LOu|  
 return FALSE; L%[b6<  
} X=X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -W"  w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Cq%1j[  
 AddIcon(); oAq<ag\qV  
 return res; sG k'G573  
} 5tu 4uYp;  
,=t}|!jx  
void CCaptureDlg::AddIcon() sy+tLDMd  
{ gO]jeO  
 NOTIFYICONDATA data; GPU,.s"&(  
 data.cbSize=sizeof(NOTIFYICONDATA); `Ct fe8  
 CString tip; N:e5=;6s  
 tip.LoadString(IDS_ICONTIP); L=-v>YL+  
 data.hIcon=GetIcon(0); 47^R  
 data.hWnd=GetSafeHwnd(); aiwKkf`\  
 strcpy(data.szTip,tip); P4dhP-t  
 data.uCallbackMessage=IDM_SHELL; &-M}:'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [<A|\d'x  
 data.uID=98; H6%%n X  
 Shell_NotifyIcon(NIM_ADD,&data); iz\GahK  
 ShowWindow(SW_HIDE); 222Mm/QN  
 bTray=TRUE; bZzB\FB~  
} _(J/$D  
)2y# cM*  
void CCaptureDlg::DeleteIcon() .0u@PcE:O  
{ C:@JLZB  
 NOTIFYICONDATA data; H D{2nZT  
 data.cbSize=sizeof(NOTIFYICONDATA); VF] ~J=>i  
 data.hWnd=GetSafeHwnd(); {G4{4D }  
 data.uID=98; Ga#5xAI{a  
 Shell_NotifyIcon(NIM_DELETE,&data); _|vY)4B 4U  
 ShowWindow(SW_SHOW); je^=gnq  
 SetForegroundWindow(); $Z{Xt*  
 ShowWindow(SW_SHOWNORMAL); 2<8JY4]!]  
 bTray=FALSE; ' lMPI@C6r  
} t7qY!S (  
1wM~),B8  
void CCaptureDlg::OnChange() E)utrO R  
{ a+ lGN  
 RegisterHotkey(); _h8|shyP  
} 0}iND$6@a  
x72T5.  
BOOL CCaptureDlg::RegisterHotkey() sAfNu~d  
{ a\?-uJ+  
 UpdateData(); F{"4cyoou  
 UCHAR mask=0; eg Zb)pP  
 UCHAR key=0; }D\i1/Y  
 if(m_bControl) Cp.qL  
  mask|=4; s\A4y "  
 if(m_bAlt) X4Y!Z/b  
  mask|=2; =E10j.r  
 if(m_bShift) af<wUxM0  
  mask|=1; :o+&>z  
  key=Key_Table[m_Key.GetCurSel()]; '\I!RAZ  
 if(bRegistered){ f?|cQ[#t!\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Hklgf  
  bRegistered=FALSE; X|Z2"*;b`  
 } #Qnl,lf  
 cMask=mask;  {;| >Qn  
 cKey=key; t,vj)|:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3}9c0%}F  
 return bRegistered; vo JmNH  
} mx;1'!'fr  
GFppcL@a  
  四、小结 $PE{}`#g  
o"-*,:Qe  
  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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