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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: I/njyV)H  
  + kMj|()>\  
  一、实现方法  "M5  
6 ^3RfF^W  
  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: o`c+eMwr(  
~Tt@ v`}  
#pragma data_seg("shareddata")  C^"zU>W_  
HHOOK hHook =NULL; //钩子句柄 eY :"\c3  
UINT nHookCount =0; //挂接的程序数目 =T9h7c R  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j<~Wp$\i7>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3FR(gr$X  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey SQ,-45@W  
static int KeyCount =0; -kk7y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 G~1;_'  
#pragma data_seg() !-OZ/^l|O`  
lq:q0>vyI  
  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。 ^Q`5+  
aPelt`  
  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: gw"cXny  
Cy?]o?_?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1]:,Xa+|S  
cKey,UCHAR cMask) {KHI(*r;  
{ M3-lL;!n  
 BOOL bAdded=FALSE; 2%WeB/)9  
 for(int index=0;index<MAX_KEY;index++){ &"%Ws{Qn]  
  if(hCallWnd[index]==0){ 7=Muq]j2  
   hCallWnd[index]=hWnd; our ^J8  
   HotKey[index]=cKey; yDqwz[v b  
   HotKeyMask[index]=cMask; iKaX8c,zI  
   bAdded=TRUE; 8s6[-F5  
   KeyCount++; u"qu!EY2  
   break; "j_iq"J  
  } "a[;{s{{.  
 } qIuo8o}  
 return bAdded; ,<L4tp+y0  
} r[!~~yu/o  
//删除热键  )58O9b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yb',nGl~  
{ h7+"*fN  
 BOOL bRemoved=FALSE; Vx<{cHQQ  
 for(int index=0;index<MAX_KEY;index++){ ;9j ]P56  
  if(hCallWnd[index]==hWnd){ 90}vFoy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9$$  Ijf  
    hCallWnd[index]=NULL; 73X*|g  
    HotKey[index]=0; ^}~Q(ji7  
    HotKeyMask[index]=0; @HbRfD/!  
    bRemoved=TRUE; xK6`|/e  
    KeyCount--; clU ?bF~e1  
    break; E'\gd7t ;  
   } t[q2 W"#.  
  } y7UU'k`  
 } tlQ6>v'  
 return bRemoved; W]eILCo  
} l!:bNMd  
#k9&OS?  
[ ojL9.6  
  DLL中的钩子函数如下: c(=>5  
=7+%31  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K uwhA-IL  
{ :-d#kU  
 BOOL bProcessed=FALSE; *}C%z(  
 if(HC_ACTION==nCode) @2"3RmYLo  
 { 5Yv*f:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 YWn""8p;P  
   switch(wParam) 68?&`/t  
   {  R_G2C@y*  
    case VK_MENU: AHs%?5YTY;  
     MaskBits&=~ALTBIT; ,mm97I  
     break; !LH;K  
    case VK_CONTROL: lx2#C9L_  
     MaskBits&=~CTRLBIT; /4Wf\ Zu  
     break; g sm%4>sc  
    case VK_SHIFT: R8[VD iM6E  
     MaskBits&=~SHIFTBIT; /UunWZ u%  
     break; &C MBTY#u  
    default: //judge the key and send message E?+~S M1~  
     break; PWS8Dpb  
   } N>3{!K>/Y:  
   for(int index=0;index<MAX_KEY;index++){ R7rM$|n=o  
    if(hCallWnd[index]==NULL) d"n>Q Tn\  
     continue; PV,Z@qm@^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0E#??gN  
    { dE8f?L'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 75H!i$(*+  
     bProcessed=TRUE; <y?+xZM]#|  
    } ** m8 HD  
   } 2j4202  
  } &PPnI(s^K  
  else if((lParam&0xc000ffff)==1){ //有键按下 EC$F|T0f  
   switch(wParam) {Yxvb**  
   { QswPga(-  
    case VK_MENU: e*'bY;8lo  
     MaskBits|=ALTBIT; b&!}SZ  
     break; (+v':KH3_  
    case VK_CONTROL: 7a9">:~  
     MaskBits|=CTRLBIT; D>jtz2y=D  
     break; Ch?yk^cY  
    case VK_SHIFT: iyCH)MA  
     MaskBits|=SHIFTBIT; xytWE:=  
     break; H9jlp.F  
    default: //judge the key and send message L$c 1<7LU  
     break; 5(#z)T  
   } 8-+# !]  
   for(int index=0;index<MAX_KEY;index++){ 4wKCz Py  
    if(hCallWnd[index]==NULL) Fb<'L5}i  
     continue; O=U,x-Wl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kVsX/ ~$  
    { LiHJm-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mm8_EjMp  
     bProcessed=TRUE; qDG x (d  
    } _lI(!tj(  
   } 8Q/cJ+&  
  } Tg O]q4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 H8"RdKwg?  
   for(int index=0;index<MAX_KEY;index++){ ,+BFpN'  
    if(hCallWnd[index]==NULL) Ke^/aGi}O  
     continue; '2l[~T$*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @}UOm- M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O(evlci  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N@0/=B[n  
   } c%G~HOE=B  
  } rYPuo  
 } n.N0Nhd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); sifjmNP  
} &56\@t^  
fR;[??NH  
  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: :Hitx  
x s6!NY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -d!84_d9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6@0? ~  
SgQmR#5  
  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: oSYJXs  
]p(es,[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CA|W4f}  
{ /!&eP3^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?a+J4Zr3  
 { [EPRBK`=  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3J4OkwqD  
  SaveBmp(); M| }?5NS  
  return FALSE; ( q*/=u  
 } .gNJY7`b  
 …… //其它处理及默认处理 qu1! KS  
} %A `9[icy  
P<1&kUZL  
4Vj]bm  
  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。  [Ketg  
C.=%8|Zy  
  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。 }rVLWt  
J|V*g]#kP  
  二、编程步骤 :ldI1*@i<  
3KD:JKn^  
  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"; sFfargl  
=`}|hI   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <vg|8-,#m  
NSRY(#3  
  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; MkZoHzg}c  
Xa}y.qH  
  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; h _c11#  
}+NlY D:qF  
  5、 添加代码,编译运行程序。 29@m:=-}7  
s*CBYzOm  
三、程序代码 $\oe}`#o  
&xj,.;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL AA|G &&1y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9Z2aFW9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =;8q`  
#if _MSC_VER > 1000 4tiCxf)  
#pragma once xjDaA U,  
#endif // _MSC_VER > 1000 q/7T-"q/G  
#ifndef __AFXWIN_H__ L{f0r!d|  
#error include 'stdafx.h' before including this file for PCH yF XPY=EQ  
#endif t]t(/x#  
#include "resource.h" // main symbols 'Um\m  
class CHookApp : public CWinApp <ihJp^kgQ  
{ BW`Tw^j  
 public: coXm*X>z  
  CHookApp(); A8nf"mRD:  
  // Overrides k~Y_%#_  
  // ClassWizard generated virtual function overrides mk-L3H1@J3  
  //{{AFX_VIRTUAL(CHookApp) tp V61L   
 public: @!\lt$  
  virtual BOOL InitInstance(); ewYk>  
  virtual int ExitInstance(); KmF+3g~#s  
  //}}AFX_VIRTUAL k V'0rb  
  //{{AFX_MSG(CHookApp)  vO;:~  
  // NOTE - the ClassWizard will add and remove member functions here. "8[Vb#=*e  
  // DO NOT EDIT what you see in these blocks of generated code ! Ip,0C8T`Q  
  //}}AFX_MSG K]U8y$^  
  DECLARE_MESSAGE_MAP() f,+ONV]5Tt  
}; I} ]s(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); oM}P Wf-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); / vzwokH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rYyEs I#qo  
BOOL InitHotkey(); Zg;Ht  
BOOL UnInit(); bu\D*-  
#endif Wf  *b"#  
?P2 d 9b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `t #I e *  
#include "stdafx.h" sgeME^v  
#include "hook.h" @ao Hz8K  
#include <windowsx.h> D7N` %A8   
#ifdef _DEBUG {<^PYN>`  
#define new DEBUG_NEW yc$8X sns  
#undef THIS_FILE ;fY)7 '  
static char THIS_FILE[] = __FILE__; '$CJZ`nt  
#endif {uO2m*JrI  
#define MAX_KEY 100 :B_ itl0{e  
#define CTRLBIT 0x04 'l'[U  
#define ALTBIT 0x02 aQfrDM<*XS  
#define SHIFTBIT 0x01 ""F' Nzy  
#pragma data_seg("shareddata") h,Tsb:Q"M  
HHOOK hHook =NULL; 1QDAfRx  
UINT nHookCount =0; (/_Z^m9   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey X?]1/6rV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /aMeKM[L`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^p7Er!  
static int KeyCount =0; A!5)$>!o  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y$pT5X G  
#pragma data_seg() [hXU$Y>"0  
HINSTANCE hins; D\G P+Ota  
void VerifyWindow(); uw&'=G6v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \Mod4tQ  
//{{AFX_MSG_MAP(CHookApp) I'RhA\`  
// NOTE - the ClassWizard will add and remove mapping macros here. ,ffH:3F  
// DO NOT EDIT what you see in these blocks of generated code! 7b[vZNi_  
//}}AFX_MSG_MAP 4#@zn 2l  
END_MESSAGE_MAP() K1Wiiw  
(}n,Ou[  
CHookApp::CHookApp() oBTRO0.s+  
{ E%C02sI  
 // TODO: add construction code here, hAp<$7  
 // Place all significant initialization in InitInstance i;B)@op.#  
} H23-%+*J  
wrW768WR  
CHookApp theApp; GKKf#r74  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z:}d\~`x$%  
{ vSy#[9}  
 BOOL bProcessed=FALSE; 6<<ihm+  
 if(HC_ACTION==nCode) JB= L\E}  
 { A#j'JA>_  
  if((lParam&0xc0000000)==0xc0000000){// Key up p1L8g[\  
   switch(wParam) Gv w:h9v  
   { { wx!~K  
    case VK_MENU: Y/_b~Ahn  
     MaskBits&=~ALTBIT; `!\`yI$!%w  
     break; BI-xo}KI  
    case VK_CONTROL: @{!c [{x,T  
     MaskBits&=~CTRLBIT; 'Nv*ePz  
     break; J@c)SK%2h  
    case VK_SHIFT: k:0HsN!F9  
     MaskBits&=~SHIFTBIT; \{[Gdj`  
     break; <M|kOi  
    default: //judge the key and send message ca1A9fvo  
     break; @t6B\ ?4'T  
   } RE(R5n28,  
   for(int index=0;index<MAX_KEY;index++){ O=Py XOf  
    if(hCallWnd[index]==NULL) PNn{Rt  
     continue; BK8)'9/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LHb(T` .=  
    { ^H1B 62_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QvH=<$  
     bProcessed=TRUE; Zg/ra1n  
    } 'J&$L c  
   } P'6eK?  
  } ?_9A`LC*  
  else if((lParam&0xc000ffff)==1){ //Key down kN*,3)T;}  
   switch(wParam) J!,<NlP0K  
   { w QX,a;Br  
    case VK_MENU: Rb~NX  
     MaskBits|=ALTBIT; Vn-y<*np  
     break; b*xw=G3%  
    case VK_CONTROL: /}\EMP  
     MaskBits|=CTRLBIT; /8i3I5*  
     break; 7 Ld5  
    case VK_SHIFT: 9a5x~Z:'  
     MaskBits|=SHIFTBIT; tTB,eR$  
     break; x_vaYUl)  
    default: //judge the key and send message Z!P7mH\c}  
     break; c1?_L(  
   } _Jc[`2Uv_c  
   for(int index=0;index<MAX_KEY;index++) Re{vO&.  
   { {]/}3t  
    if(hCallWnd[index]==NULL) %(,Kj ~0  
     continue; ?6F\cl0.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7Rf${Wv0  
    { W4Ey]y"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); wtCz%!OYB  
     bProcessed=TRUE; P"LbWZ6Nj  
    } %># VhK  
   } %(IkUD  
  } oZkjg3  
  if(!bProcessed){ YzqUOMAt"V  
   for(int index=0;index<MAX_KEY;index++){ :O}=$[  
    if(hCallWnd[index]==NULL) ]E\o<"#t/  
     continue; HrH-e= j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }j^asuf~c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?CgqHmf\\(  
   } '`#sOH  
  } x78`dX  
 } *UVo>;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [=[>1<L>  
} EIqe|a+  
]Z?y\L*M-  
BOOL InitHotkey() E)l0`83~^  
{ Nr?Z[6O|  
 if(hHook!=NULL){ wJs #rkW  
  nHookCount++; 7{%_6b"  
  return TRUE; );o2e V  
 } !e5!8z  
 else PT7-_r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B8){  
  if(hHook!=NULL) }&+b\RE  
   nHookCount++; uOzol~TU)  
  return (hHook!=NULL); tA2Py  
} 'O%itCy)  
BOOL UnInit() &DQyJJ`k  
{ [ZC{eg+D  
 if(nHookCount>1){ v803@9@  
  nHookCount--; WZ\bm$  
  return TRUE; ),ur! v  
 } LO8`qq*rq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m5c?A+@fZ  
 if(unhooked==TRUE){ % ~eIx=s  
  nHookCount=0; tI42]:z  
  hHook=NULL; -? _#Yttu  
 } AI{Tw>hZ  
 return unhooked; Ah5`Cnv  
} -][~_Hd{  
I!FIV^}Z(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3K2B7loD)~  
{ cZB?_[Cp  
 BOOL bAdded=FALSE; tk'1o\@p9b  
 for(int index=0;index<MAX_KEY;index++){ rucgav  
  if(hCallWnd[index]==0){ N8hiv'3  
   hCallWnd[index]=hWnd; I$. HG]  
   HotKey[index]=cKey; w$Zi'+&*  
   HotKeyMask[index]=cMask; vGe];  
   bAdded=TRUE; c2Q KI~\x  
   KeyCount++; q~esxp  
   break; Ass :  
  } 2a=3->D&  
 } us j:I`>  
 return bAdded; RLy(Wz3%  
} -|0nZ  
B bU%p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b`a4SfbQS  
{ @|AHTf!  
 BOOL bRemoved=FALSE; -BQoNEh  
 for(int index=0;index<MAX_KEY;index++){ BC:d@  
  if(hCallWnd[index]==hWnd){ 7s8-Uwl<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {)V!wSi  
    hCallWnd[index]=NULL; 8DAHaS;  
    HotKey[index]=0; <v&L90+s\;  
    HotKeyMask[index]=0; oeV. K.  
    bRemoved=TRUE; 63'Rw'g^|2  
    KeyCount--; dY=]ES} `  
    break; o#GZ|9IL  
   } Qt-7jmZw1  
  } 5&59IA%S  
 } Z^tTR]u\$  
 return bRemoved; *Ubsa9'fS  
} Y~E 8z  
WC& V9Yk  
void VerifyWindow() <{ZDD]UGs0  
{ ltQo_k  
 for(int i=0;i<MAX_KEY;i++){ i}u,_ }  
  if(hCallWnd!=NULL){ bwrM%BL  
   if(!IsWindow(hCallWnd)){ #)}K,FDd  
    hCallWnd=NULL; (G1KMy  
    HotKey=0; W&g@o@wa  
    HotKeyMask=0; bVLBqa=  
    KeyCount--; Dq07Z^#'  
   } F,dPmR  
  } h^QLvOuR  
 } 6 zyxGJ(  
} ]A? (OA  
o,r72>|  
BOOL CHookApp::InitInstance() FIMM\W  
{ "SMRvi57T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); rY?]pMp  
 hins=AfxGetInstanceHandle(); v2Ft=_*G|  
 InitHotkey(); .1{:Q1"S  
 return CWinApp::InitInstance(); "A( D}~i  
} PiwMl)E|!  
|WkWZZ^  
int CHookApp::ExitInstance() scc+r  
{ 84f(BE  
 VerifyWindow(); d/"%fpp^0G  
 UnInit(); XE#a#  
 return CWinApp::ExitInstance(); plNoI1st  
} 8}M-b6R V  
MnL o{G]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *x!j:/S`n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B~ ?R 6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h5)4Z^n  
#if _MSC_VER > 1000 H*.v*ro9_  
#pragma once K#%@4]jO3  
#endif // _MSC_VER > 1000 C.|.0^5  
q1^bH 6*fl  
class CCaptureDlg : public CDialog ,kQCCn]  
{ 2y"L&3W  
 // Construction \sn wR  
 public: 7|@FN7]5NF  
  BOOL bTray; K ' ?`'7  
  BOOL bRegistered; _^Z v[P  
  BOOL RegisterHotkey();  2S  
  UCHAR cKey; gB_gjn\  
  UCHAR cMask; w,T-vf  
  void DeleteIcon(); g+j\wvx0  
  void AddIcon(); S4S}go*G[  
  UINT nCount; 8l>7=~Egp  
  void SaveBmp(); q _INGCJ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i}L*PCP  
  // Dialog Data Vg^yjP{sv  
  //{{AFX_DATA(CCaptureDlg) $6l^::U  
  enum { IDD = IDD_CAPTURE_DIALOG }; N,bH@Q.Ci  
  CComboBox m_Key; Hg~8Td**  
  BOOL m_bControl; " k0gZb  
  BOOL m_bAlt; Y=?Tm,z4  
  BOOL m_bShift; Cl8S_Bz  
  CString m_Path; o$p] p9  
  CString m_Number; +;Pkpuu  
  //}}AFX_DATA  ^:^  
  // ClassWizard generated virtual function overrides Vl^p3f[  
  //{{AFX_VIRTUAL(CCaptureDlg) 3^Q;On|  
 public: {_G_YL[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5(>ux@[qI:  
 protected: 79z/(T +  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t`- [  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); LVaJyI@/>  
  //}}AFX_VIRTUAL v8"Zru  
  // Implementation z8dBfA<z  
 protected: *DgRF/S  
  HICON m_hIcon; A I v  
  // Generated message map functions Ow N~-).%-  
  //{{AFX_MSG(CCaptureDlg) P67*-Ki  
  virtual BOOL OnInitDialog(); ,7I    
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "]bOpk T  
  afx_msg void OnPaint(); $ba*=/{[q  
  afx_msg HCURSOR OnQueryDragIcon(); 782 oXyD  
  virtual void OnCancel(); |;(>q  
  afx_msg void OnAbout(); gXj3=N(l  
  afx_msg void OnBrowse(); j.yh>"de  
  afx_msg void OnChange(); /s~BE ,su  
 //}}AFX_MSG 6/.kL;AI  
 DECLARE_MESSAGE_MAP() Z817f]l  
}; N^{}Qvrr  
#endif _oHxpeM  
P\y ZcL  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0Of6$`  
#include "stdafx.h" 7/HX!y{WP  
#include "Capture.h" v]'\]U^  
#include "CaptureDlg.h" uovSe4q5q  
#include <windowsx.h> *m8{yh  
#pragma comment(lib,"hook.lib") $WiU oS  
#ifdef _DEBUG ^KJi |'B  
#define new DEBUG_NEW 9T\\hM)k  
#undef THIS_FILE {wl7&25  
static char THIS_FILE[] = __FILE__; -bgj<4R$p  
#endif G '%ZPh89  
#define IDM_SHELL WM_USER+1 u f1s}/M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x9o(q`N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *^iSP(dg  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !ir%Pz ^)  
class CAboutDlg : public CDialog \bies1TBB^  
{ QuBA'4ht  
 public: ,:{+-v(  
  CAboutDlg(); . )E1|U[L  
  // Dialog Data Qoa&]]  
  //{{AFX_DATA(CAboutDlg) uvRX{q 4  
  enum { IDD = IDD_ABOUTBOX }; Eb8~i_B-  
  //}}AFX_DATA 1XpqnyL&  
  // ClassWizard generated virtual function overrides ub2B!6f a  
  //{{AFX_VIRTUAL(CAboutDlg) JkEITuTth  
 protected: sD9OV6^{?K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g^{a;=  
  //}}AFX_VIRTUAL )m I i.  
  // Implementation ,va2:V  
 protected: ~uG/F?= Q:  
  //{{AFX_MSG(CAboutDlg) 5~OKKSUmT  
  //}}AFX_MSG Jv8VM\ *  
  DECLARE_MESSAGE_MAP() VHLt, ?G  
}; yuhY )T  
xJin %:O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^e]h\G  
{ DB0?H+8t  
 //{{AFX_DATA_INIT(CAboutDlg) gX`C76P!  
 //}}AFX_DATA_INIT {*"\6 8e  
} N"7BV  
(_Th4'(@Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M}`T-"qf  
{ I0N~>SpZ5  
 CDialog::DoDataExchange(pDX); ]l"9B'XR  
 //{{AFX_DATA_MAP(CAboutDlg) SB:z[kfz|  
 //}}AFX_DATA_MAP )K]<\Q[  
} od^o9(.W^  
%"ehZ d0r  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {5 3#Xd  
 //{{AFX_MSG_MAP(CAboutDlg) vcZ"4%w  
 // No message handlers Y=/;7T  
 //}}AFX_MSG_MAP 4m%Yck{R  
END_MESSAGE_MAP() Qnx?5R-}ZU  
xiVbVr#[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #+ {%>f  
: CDialog(CCaptureDlg::IDD, pParent) KvjH\;78  
{ \1eWI  
 //{{AFX_DATA_INIT(CCaptureDlg) dFZh1*1  
  m_bControl = FALSE; z"*3p8N  
  m_bAlt = FALSE; u63Q<P<  
  m_bShift = FALSE; As??_=>4  
  m_Path = _T("c:\\"); W]D+[mpgK  
  m_Number = _T("0 picture captured."); `69xR[f  
  nCount=0; u~!Pzz3"  
  bRegistered=FALSE; z3M6<.K  
  bTray=FALSE; }vZTiuzC  
 //}}AFX_DATA_INIT KDr)'gl&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1i#U&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M8VsU*aU  
} /px`FuJI(  
wsj5;(f+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )o;n2T#O  
{ FX+^S?x.  
 CDialog::DoDataExchange(pDX); =%{E^z>1  
 //{{AFX_DATA_MAP(CCaptureDlg) SJlL!<i$  
  DDX_Control(pDX, IDC_KEY, m_Key); =kw6<!R  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;I>77gi`]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); d 1 O+qS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :eBp`dmn  
  DDX_Text(pDX, IDC_PATH, m_Path); 5N907XVu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %1M!4**W  
 //}}AFX_DATA_MAP 7U - ?Rd  
} 3 =_to7]  
[bEm D  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lgC^32y  
//{{AFX_MSG_MAP(CCaptureDlg) n*hRlL  
 ON_WM_SYSCOMMAND() 6W'2w?qj?4  
 ON_WM_PAINT() CWkAc5  
 ON_WM_QUERYDRAGICON() 9abn6S(XpJ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) LufZ,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) OQ _wsAA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) zTze %  
//}}AFX_MSG_MAP {/XU[rn  
END_MESSAGE_MAP() 7mYBxE/  
/?C6 oj1  
BOOL CCaptureDlg::OnInitDialog() ~{D:vj4>  
{ h)T-7b  
 CDialog::OnInitDialog(); F5<GGEQb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _p| KaT``  
 ASSERT(IDM_ABOUTBOX < 0xF000); '~76Y9mv  
 CMenu* pSysMenu = GetSystemMenu(FALSE); TzrU |D?  
 if (pSysMenu != NULL) yjucR Fl  
 { d-"[-+)-  
  CString strAboutMenu; &uJ7[m19z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); u"zQh|  
  if (!strAboutMenu.IsEmpty()) BtP*R,>  
  { [,qb) &_  
   pSysMenu->AppendMenu(MF_SEPARATOR); DO? bJ01  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fG /wU$B  
  } eS"sd^;R  
 } (d-j/v*4  
 SetIcon(m_hIcon, TRUE); // Set big icon `=#ry*E^:  
 SetIcon(m_hIcon, FALSE); // Set small icon |9 4xRC  
 m_Key.SetCurSel(0); nmrdqSV  
 RegisterHotkey(); @3>nVa  
 CMenu* pMenu=GetSystemMenu(FALSE); !7anJl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MM Nz2DEy[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); JmVha!<qk  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;%PdSG=U  
 return TRUE; // return TRUE unless you set the focus to a control ] I0(_e|z}  
} +isaqfy/  
]TKM.[[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k N$L8U8f  
{ ,lw<dB@7"5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) XJf1LGT5  
 { }UHoa  
  CAboutDlg dlgAbout; B9h>  
  dlgAbout.DoModal(); 0N3S@l#,\A  
 } hH@pA:`s  
 else +yu^Z*_  
 { |y7#D9m  
  CDialog::OnSysCommand(nID, lParam); _Y,d|!B#L  
 } evHKq}{  
} wB W]w  
PRF^<%mkI  
void CCaptureDlg::OnPaint() ~ TALpd  
{ "G!V?~;  
 if (IsIconic()) :#p!&Fi  
 { tL@m5M%:N2  
  CPaintDC dc(this); // device context for painting N @sVA%L.  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -%)8=  
  // Center icon in client rectangle rDWqJ<8  
  int cxIcon = GetSystemMetrics(SM_CXICON); W= \gPCo  
  int cyIcon = GetSystemMetrics(SM_CYICON); } g[(h=Qi  
  CRect rect; NYZI;P1DA  
  GetClientRect(&rect); 8fs::}0  
  int x = (rect.Width() - cxIcon + 1) / 2; %+Khj@aX  
  int y = (rect.Height() - cyIcon + 1) / 2; 4U1"F 7'  
  // Draw the icon {piZm12q?  
  dc.DrawIcon(x, y, m_hIcon); kzb1iBe 6m  
 } iG;GAw|E  
 else Xa32p_|5~  
 { @Y2&v956  
  CDialog::OnPaint(); ] Q\/si&  
 } ?{I]!gI  
} zbL6TP@=  
t^1c^RpTb  
HCURSOR CCaptureDlg::OnQueryDragIcon() Cdd +I5~  
{ 5%6r,?/7KM  
 return (HCURSOR) m_hIcon; lGP'OY"Q  
} UBxQ4)%  
!'EE8Tp~F  
void CCaptureDlg::OnCancel() $:MO/Su z{  
{ goV[C]|  
 if(bTray) BpKgUwf;C  
  DeleteIcon(); o\YF_235  
  CDialog::OnCancel(); nANoy6z:  
} gRdg3qvU  
5zH?1Z~*  
void CCaptureDlg::OnAbout() O~AOZ^a:2  
{ hkL[hD  
 CAboutDlg dlg; 8TnByKZz  
 dlg.DoModal(); D;al(q  
} nf MQ3K P  
3#H x^H  
void CCaptureDlg::OnBrowse() @rVBL<!o,  
{ `&yUU2W  
 CString str; OVm $  
 BROWSEINFO bi; pJE317 p'  
 char name[MAX_PATH]; U ]6 Hml;l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yegTKoY  
 bi.hwndOwner=GetSafeHwnd(); TBYRY)~f  
 bi.pszDisplayName=name; Pc4FEH/  
 bi.lpszTitle="Select folder"; glppb$oB\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G&Sp }  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); RT)*H>|  
 if(idl==NULL) ' cl&S:  
  return; 5? s$(Lt~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); V/G'{ q  
 str.ReleaseBuffer(); nEM>*;iE   
 m_Path=str; }]H_|V*f  
 if(str.GetAt(str.GetLength()-1)!='\\') oA&V,r  
  m_Path+="\\"; XK>/i}y  
 UpdateData(FALSE); $h-5PwHp  
} vO2o/   
pc w^W  
void CCaptureDlg::SaveBmp() dSb|hA}@  
{ Hs+VA$$*  
 CDC dc; 5Qik{cWxBq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cFoDR  
 CBitmap bm; h*Y);mc$#  
 int Width=GetSystemMetrics(SM_CXSCREEN); <Dw`Ur^X5  
 int Height=GetSystemMetrics(SM_CYSCREEN); +M6qbIO  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !ldb_*)h  
 CDC tdc; u9FXZK7  
 tdc.CreateCompatibleDC(&dc); HhaUC?JtSK  
 CBitmap*pOld=tdc.SelectObject(&bm); {7)D/WY5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y.~y*c6,g  
 tdc.SelectObject(pOld); sSi1;9^o  
 BITMAP btm; |.Bb Pfe8f  
 bm.GetBitmap(&btm); pCNihZ~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _1`*&k JL~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0=;jGh}|i  
 BITMAPINFOHEADER bih; ++:vO  
 bih.biBitCount=btm.bmBitsPixel; B8_ w3;x  
 bih.biClrImportant=0; 5[M?O4mi  
 bih.biClrUsed=0; Ak$gh b  
 bih.biCompression=0; V$+xJ  m  
 bih.biHeight=btm.bmHeight; z.:{   
 bih.biPlanes=1; JI}(R4uV  
 bih.biSize=sizeof(BITMAPINFOHEADER); Wr7^  
 bih.biSizeImage=size; a'ViyTBo  
 bih.biWidth=btm.bmWidth; F t%f"Z  
 bih.biXPelsPerMeter=0; DA@YjebP'  
 bih.biYPelsPerMeter=0; s,Cm}4L6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); SQ)$>3>C  
 static int filecount=0; l'(Cxhf.W  
 CString name; {b>tX)Tep  
 name.Format("pict%04d.bmp",filecount++); Te~"\`omJ3  
 name=m_Path+name; jBV2]..  
 BITMAPFILEHEADER bfh; uRQm.8b  
 bfh.bfReserved1=bfh.bfReserved2=0; U%ce0z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5DfAL;o!  
 bfh.bfSize=54+size; <$n%h/2%  
 bfh.bfOffBits=54; WJZW5 Xt  
 CFile bf; 9/RbfV[)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SM5i3EcFYP  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UcDJ%vI  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [K[tL|EK  
  bf.WriteHuge(lpData,size); _`L,}=um'  
  bf.Close(); n\5` JNCb  
  nCount++; 8f% @  
 } =V1k'XJ  
 GlobalFreePtr(lpData); N7*JL2Rnq  
 if(nCount==1) ]YZ+/:#U7  
  m_Number.Format("%d picture captured.",nCount); _tL*sA>[~)  
 else >>wb yj8  
  m_Number.Format("%d pictures captured.",nCount); ;"&^ckP  
  UpdateData(FALSE); zGu(y@o  
} =O w}MX  
fEdQR->  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  FZnkQ  
{ *L/_ v  
 if(pMsg -> message == WM_KEYDOWN) YcGSZ0vQ  
 { LGPy>,!  
  if(pMsg -> wParam == VK_ESCAPE) t(CdoE,6  
   return TRUE; 6z"fBF  
  if(pMsg -> wParam == VK_RETURN) $GUSTV  
   return TRUE; XZA3T Z  
 } fSl+;|K n  
 return CDialog::PreTranslateMessage(pMsg); }#q9>gx  
} *8U+2zgfC  
b/'fC%o,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t/_w}  
{ #;a 1=8H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ UKQ ,]VC  
  SaveBmp(); f!*b8ND^R  
  return FALSE; 5SK{^hw  
} M'W@K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U n2xZ[4  
 CMenu pop; B @UaaWh  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 'rRo2oTN  
 CMenu*pMenu=pop.GetSubMenu(0); O$Wt\Y <q  
 pMenu->SetDefaultItem(ID_EXITICON); G!oq ;<  
 CPoint pt; YU[93@mCh  
 GetCursorPos(&pt); 8[ 1D4d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a |32Pn  
 if(id==ID_EXITICON) Rs{L  
  DeleteIcon(); /+P 4cHv]F  
 else if(id==ID_EXIT) oGly|L>  
  OnCancel(); ,y3o ,gl  
 return FALSE; 57)S"  
} vAq`*]W+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $uawQf+S  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8N!E`{W  
 AddIcon(); w]UYD;f  
 return res; Mvrc[s+o  
} F^IYx~:  
C!B2 .:ja  
void CCaptureDlg::AddIcon() AGn:I??  
{ LCRreIIgZ  
 NOTIFYICONDATA data; @W=#gRqQPy  
 data.cbSize=sizeof(NOTIFYICONDATA); xqO'FQO%  
 CString tip; ]o_Z3xXUa  
 tip.LoadString(IDS_ICONTIP); ;) 5d wq  
 data.hIcon=GetIcon(0); hv}rA,Yd  
 data.hWnd=GetSafeHwnd(); #wNksh/J^  
 strcpy(data.szTip,tip); EkEM|<GNd  
 data.uCallbackMessage=IDM_SHELL; AASw^A3p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z* YkD"]B  
 data.uID=98; %z J)mOu  
 Shell_NotifyIcon(NIM_ADD,&data); AR]y p{NS  
 ShowWindow(SW_HIDE); II)\rVP5  
 bTray=TRUE; PLKp<kg  
} IBf&'/ 8\  
WHqp7NPl  
void CCaptureDlg::DeleteIcon() s,"<+80%  
{ Bra>C  
 NOTIFYICONDATA data;  <G{m=  
 data.cbSize=sizeof(NOTIFYICONDATA); yd`xmc)  
 data.hWnd=GetSafeHwnd(); v6HBO#F'V{  
 data.uID=98; iT%aAVs  
 Shell_NotifyIcon(NIM_DELETE,&data); /lx\9S|  
 ShowWindow(SW_SHOW); hkJ4,.  
 SetForegroundWindow();  3@J0-w  
 ShowWindow(SW_SHOWNORMAL); V z8o  
 bTray=FALSE; 5 1@V""m  
} |J'@-*5?[8  
0V"r$7(}  
void CCaptureDlg::OnChange() Cv>|>Ob#  
{ )(9>r /bq  
 RegisterHotkey(); ?&_ -,\t  
} CK 3]]{  
Ji :2P*  
BOOL CCaptureDlg::RegisterHotkey()  VD;Ot<%  
{ V2,54YE  
 UpdateData(); U voX\  
 UCHAR mask=0; GX&BUP\  
 UCHAR key=0; =_\5h=`Yx  
 if(m_bControl) "8&pT^  
  mask|=4; 7!#x-KR~5  
 if(m_bAlt) "nU5c4   
  mask|=2; (\, <RC\  
 if(m_bShift) ?5Wjy  
  mask|=1; yaMNt}y-q  
  key=Key_Table[m_Key.GetCurSel()]; 4v33{sp  
 if(bRegistered){ wxkCmrV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  nk>  
  bRegistered=FALSE; 3DV';  
 } .|JJyjRA+  
 cMask=mask; v98=#k!F  
 cKey=key; xM8}Xo  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fB:9:NX  
 return bRegistered; hq6fDRO/4  
} 1Zx|SBF  
HlqCL1\<  
  四、小结 4!i`9w$$"  
u01 'f-h  
  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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