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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: WnUweSdW  
  l&VjUPz_  
  一、实现方法 :f5s4N  
j6~nE'sQ  
  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: X7UuwIIP  
;g_> ;tR/  
#pragma data_seg("shareddata") G!8Z~CPF  
HHOOK hHook =NULL; //钩子句柄 v1k)hFjPK  
UINT nHookCount =0; //挂接的程序数目 5m=I*.qE  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 MC((M,3L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K'iIJA*Sn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #eU.p&Zc  
static int KeyCount =0; uV-'~8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 a9zw)A  
#pragma data_seg() o[ENp'r  
O<)y-nx;X  
  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。 gw`B"c|  
Ee1LO#^_6  
  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: ^[Ua46/"m  
) yY6rI;:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR b5IA"w  
cKey,UCHAR cMask) =&0wr6  
{ FEPXuCb  
 BOOL bAdded=FALSE; Glq85S  
 for(int index=0;index<MAX_KEY;index++){ ]nQt>R p_  
  if(hCallWnd[index]==0){ r!P}u  
   hCallWnd[index]=hWnd; 2>-S-;i  
   HotKey[index]=cKey; o47r<>t  
   HotKeyMask[index]=cMask; RO0>I8c1c  
   bAdded=TRUE; 3Y)PU=  
   KeyCount++; S0g'r !;6  
   break; aw ?=hXR!  
  } =z{JgD/  
 } +5.t. d  
 return bAdded; ri C[lB  
} E| YdcS  
//删除热键 ]Mj/&b>"e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sp}D ;7  
{ biozZ  
 BOOL bRemoved=FALSE; ]J9cVp  
 for(int index=0;index<MAX_KEY;index++){ 133I.XBU  
  if(hCallWnd[index]==hWnd){ B .TB\j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FVv8--  
    hCallWnd[index]=NULL; 4$/i%B#ad  
    HotKey[index]=0; ~.PO[hC  
    HotKeyMask[index]=0; .0u/|Yx  
    bRemoved=TRUE; T,fI BD:  
    KeyCount--; Tj~IaU  
    break; S1_6C:^k  
   } qj0 1]  
  } H4OhIxK  
 } ky>wOaTmN6  
 return bRemoved; NVIK>cT6  
} o ]Jv;Iy@?  
s{ V*1$e~  
Q "oI])r  
  DLL中的钩子函数如下: UgB'[@McS  
2>} xhQJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C^t(^9  
{ =S[yE]v^  
 BOOL bProcessed=FALSE; ( nW67YTr  
 if(HC_ACTION==nCode) PCd0 ?c   
 { KucV3-I  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /$n ~lf  
   switch(wParam) c[}(O H  
   {  V&soN:HS  
    case VK_MENU: .%'(9E  
     MaskBits&=~ALTBIT; ES<1tG  
     break; VhT= l  
    case VK_CONTROL: in<Rq"L  
     MaskBits&=~CTRLBIT; UV}73Sp  
     break; 5ep/h5*/  
    case VK_SHIFT: j4FeSGa  
     MaskBits&=~SHIFTBIT; Lf:uNl*D  
     break; oHM ]  
    default: //judge the key and send message |vte=)%  
     break; &"_u}I&\  
   } " "O"  
   for(int index=0;index<MAX_KEY;index++){ `<^VR[Mx  
    if(hCallWnd[index]==NULL) K.C> a:J  
     continue; 4fh^[\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0s#vwK13  
    { E'1+Yq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TUL_TR  
     bProcessed=TRUE; bG&"9b_c  
    } }14 {2=!Q  
   } :J}t&t  
  } z s Qo$p  
  else if((lParam&0xc000ffff)==1){ //有键按下 <1w/hy&mWN  
   switch(wParam) C0.'_  
   { eZ a:o1y  
    case VK_MENU:  g]*  
     MaskBits|=ALTBIT; |6J ?8y  
     break; PI A)d-Z  
    case VK_CONTROL: 4vK8kkW1  
     MaskBits|=CTRLBIT; GwsY-jf  
     break; HhA -[p  
    case VK_SHIFT: |VOg\[f  
     MaskBits|=SHIFTBIT; D+V7hpH-  
     break; A]`El8_t"  
    default: //judge the key and send message e{({|V '  
     break; wI M{pK  
   } {v aaFs  
   for(int index=0;index<MAX_KEY;index++){ C8@TZ[w  
    if(hCallWnd[index]==NULL) p6EDQwlf  
     continue; Uu6L~iB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CZ 2`H[8  
    { M"q[p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M_B:{%4  
     bProcessed=TRUE; z2ms^Y=j  
    } PYB+FcR6?n  
   } Uts"aQ  
  } (-7ZI"Ku  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  R7oj#  
   for(int index=0;index<MAX_KEY;index++){ x+? 9C  
    if(hCallWnd[index]==NULL) 1rw0sAuGy  
     continue; vv6$>SU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  [\)oo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sKLX[l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #gQF'  
   } +]>+a<x*%  
  } 39 e;  
 } 7RU}FE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~:;3uL s,8  
} *, Ld/O;s  
 (dJI_A  
  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: ocwG7J\W  
N5|Rmfo1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I^*'.z!4Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1`f_P$&Z_J  
Ocg"M Gb  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^s7,_!.Pq  
%k f>&b,Mi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `T ^G^7&  
{ \a "Ct'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u]C`6)>  
 { 4kp im  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ?{o/I\\  
  SaveBmp(); [~5p>'  
  return FALSE; iWXc  
 } -y) ,Y |  
 …… //其它处理及默认处理 l2v_?j-)x  
} {TSY|D2  
pvWau1ArNq  
Hyk'c't_O  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 5G}6;UY  
>Dm8m[76  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ?9j{V7h  
@b&84Gn2 r  
  二、编程步骤 78#!Q.##  
ske@uzAz  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; # jYpVc{]  
oR+-+-? ?$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;  }`/gX=91  
TmRx KrRs  
  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; fT:}Lj\L1  
n[xkSF^)  
  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; $BN15x0/:~  
yT OyDm-  
  5、 添加代码,编译运行程序。 XR# ;{p+b  
a+41|)pt  
三、程序代码 /%x7+Rl\-^  
!&kL9A).  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (Ha@s^?.C  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zbw7U'jk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ! U0z"  
#if _MSC_VER > 1000 \L!uHAE2a  
#pragma once r2*<\ax  
#endif // _MSC_VER > 1000 ,1n >U?5  
#ifndef __AFXWIN_H__ `qpc*enf0  
#error include 'stdafx.h' before including this file for PCH MKGS`X]<J  
#endif C.a5RF0  
#include "resource.h" // main symbols TT!ET<ciN  
class CHookApp : public CWinApp *}b]rjsj  
{ Y8s;w!/  
 public:  {E9v`u\  
  CHookApp(); E +_&HG}a  
  // Overrides 3 &&+Y X  
  // ClassWizard generated virtual function overrides OTvROJP  
  //{{AFX_VIRTUAL(CHookApp) $j` $[tX6l  
 public: ( `' 8Ww  
  virtual BOOL InitInstance(); Id8wS!W`7  
  virtual int ExitInstance(); (ClhbfzD  
  //}}AFX_VIRTUAL V*n==Nb5L  
  //{{AFX_MSG(CHookApp) #m. AN  
  // NOTE - the ClassWizard will add and remove member functions here. JV"NZvjN7d  
  // DO NOT EDIT what you see in these blocks of generated code ! :1fagaPg  
  //}}AFX_MSG I8m:3fL"  
  DECLARE_MESSAGE_MAP() ^%bBW6eZ  
}; PB'0?b}fab  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); J07O:cjyu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SQ(apc}N4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J}g~uW  
BOOL InitHotkey(); y%BX]~  
BOOL UnInit(); _uH9XGm  
#endif G"s0GpvQ  
I@7/jUO  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. r((Tavn  
#include "stdafx.h" _j#SpL'P  
#include "hook.h" c,5n, i  
#include <windowsx.h> $N+6h#  
#ifdef _DEBUG z MdC  
#define new DEBUG_NEW Rph%*~'  
#undef THIS_FILE gy_$#e  
static char THIS_FILE[] = __FILE__; _+QwREP  
#endif TYS\95<  
#define MAX_KEY 100 W^g'}}]T  
#define CTRLBIT 0x04 _g|acBF  
#define ALTBIT 0x02 M=!i>(yG  
#define SHIFTBIT 0x01 T{MC-j _T9  
#pragma data_seg("shareddata") Q}vbm4)[  
HHOOK hHook =NULL; 'w<BJTQIL  
UINT nHookCount =0; jp<VK<s]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <&#+ E%E4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -e`;bX_N)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -f>'RI95>  
static int KeyCount =0; zhEo(kU!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift cy3ww})  
#pragma data_seg() ziL^M"~2  
HINSTANCE hins; _vYzF+  
void VerifyWindow(); <)#kq1b?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %]4-{%v  
//{{AFX_MSG_MAP(CHookApp) 4,1oU|fz  
// NOTE - the ClassWizard will add and remove mapping macros here. 1M5 -pZ[D  
// DO NOT EDIT what you see in these blocks of generated code! iyM^[/-R6  
//}}AFX_MSG_MAP /A(NuB<Pq  
END_MESSAGE_MAP() UVX"fZ)  
>]$aoA#  
CHookApp::CHookApp() (Pi-uL<[a  
{ Q7Ij4  
 // TODO: add construction code here, c?6d2jH.  
 // Place all significant initialization in InitInstance \KM|f9-b  
} F-0UdV  
H^(L90  
CHookApp theApp; 'F_}xMU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }=@zj6AC  
{ Qlz Q]:dWC  
 BOOL bProcessed=FALSE; YdOUv|tZC  
 if(HC_ACTION==nCode) [%8@D C'  
 { 'V!kL, 9ES  
  if((lParam&0xc0000000)==0xc0000000){// Key up xb^ Mo.\[  
   switch(wParam) W cGXp$M  
   { =7jEz+w#  
    case VK_MENU: l1-HO  
     MaskBits&=~ALTBIT; qi=3L  
     break; !Yh}H<w0  
    case VK_CONTROL: pCt}66k}  
     MaskBits&=~CTRLBIT; !wh=dQgMe  
     break; 'DAltr<  
    case VK_SHIFT: :,F=w0O  
     MaskBits&=~SHIFTBIT; )SiY(8y  
     break; pMN<p[MB  
    default: //judge the key and send message UC!5 wVY  
     break; S<oQ}+4[~  
   } iHz[Zw^.s  
   for(int index=0;index<MAX_KEY;index++){ @>O&Cpt  
    if(hCallWnd[index]==NULL) v]bAWo  
     continue; rx:lKoOnB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &BgU:R,  
    { 0|C[-ppr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <-)9>c:k  
     bProcessed=TRUE; @d)a~[pm  
    } T T"3^@  
   } 0xBY(#;Q  
  } R<g=\XO'y  
  else if((lParam&0xc000ffff)==1){ //Key down QkX@QQ T?  
   switch(wParam) Kym:J \}9B  
   { [X|OrRA  
    case VK_MENU: *Q/E~4AW|t  
     MaskBits|=ALTBIT; .BL:h&h|y  
     break; raQYn?[  
    case VK_CONTROL: Nmf#`+7gCI  
     MaskBits|=CTRLBIT; <nA3Sd"QfV  
     break; AQ}l%  
    case VK_SHIFT: bj.]o*u-  
     MaskBits|=SHIFTBIT; \{>eOD_  
     break; V_]-`?S  
    default: //judge the key and send message oNSz&)LP  
     break; 2u&c &G  
   } a;p6?kv  
   for(int index=0;index<MAX_KEY;index++) % +8  
   { =eYO;l y3  
    if(hCallWnd[index]==NULL) lIl9ypikg  
     continue; 7.|S>+Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eCL?mhK  
    { 2{};6{yz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ayH>XwY6  
     bProcessed=TRUE; tJ>d4A;8x  
    } 7xDN.o*>  
   } ~~dfpW_"  
  } IMR$x(g= F  
  if(!bProcessed){ {G.{a d  
   for(int index=0;index<MAX_KEY;index++){ YHh u^}|jQ  
    if(hCallWnd[index]==NULL) yHw!#gWM  
     continue; bV7QVu8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6SAQDE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [N R1d-Wg  
   } }2xb&6g~o  
  } ~y%7w5%Un  
 } Ja=N@&Z#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3mA/Nu_  
} Ib(,P3  
-9Xw]I#QR  
BOOL InitHotkey() =0Y'f](2eW  
{ <w11nB)  
 if(hHook!=NULL){ EEg O  
  nHookCount++; 9oD#t~+F4  
  return TRUE; tQnJS2V"{u  
 } F\P!NSFZV  
 else A?V<l<EAm  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |vN$"mp^a  
  if(hHook!=NULL) "j;!_v>=f`  
   nHookCount++; 73#9NZ R  
  return (hHook!=NULL); A>y#}^l]  
} Oi#k:vq4  
BOOL UnInit() :O#gJob-%s  
{ Q,TaJ]  
 if(nHookCount>1){ ?(M\:`G'  
  nHookCount--; [M2Dy{dh  
  return TRUE; Ua!Odju*w  
 } D2-O7e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <v-92?  
 if(unhooked==TRUE){ "lb\c  
  nHookCount=0; .?7So3   
  hHook=NULL; 2X +7b M  
 } <sF!]R&4  
 return unhooked; lZ+/\s,]|  
} _4S7wOq5  
Jz2 q\42q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n%Rjt!9  
{ (Bh L/A 4  
 BOOL bAdded=FALSE; Ut=0~x.=<  
 for(int index=0;index<MAX_KEY;index++){ M, Po54u  
  if(hCallWnd[index]==0){ )S"o{N3B  
   hCallWnd[index]=hWnd; dR?5$V(  
   HotKey[index]=cKey; s={X-H< 2  
   HotKeyMask[index]=cMask; .;}pU!S~R  
   bAdded=TRUE; JG1LS$p^  
   KeyCount++; _4A&%>   
   break; 3pzOt&T|w  
  } r6/<&1[  
 } s UvKA0  
 return bAdded; ,7/\&X<`B  
} 4v i B=>  
ol1AD: Ho  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]dQZ8yVK  
{ |Yg}WHm  
 BOOL bRemoved=FALSE; <`b|L9  
 for(int index=0;index<MAX_KEY;index++){ f61]`@Bk  
  if(hCallWnd[index]==hWnd){ sV;qpDXX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X]>[Qz)K^  
    hCallWnd[index]=NULL; Oym]&SrbS  
    HotKey[index]=0; !WDn7j'A  
    HotKeyMask[index]=0; 7E@$}&E  
    bRemoved=TRUE; W'8J<VBD  
    KeyCount--; ;%lJD"yF  
    break; HX z iDnj  
   } }:tAKO=+  
  } 1Z=;Uy\  
 } zbdOCfA;  
 return bRemoved; UeC 81*XZ  
} LjX&' ,  
N>h]mX6  
void VerifyWindow() 1j8/4:  
{ VN1# 8{  
 for(int i=0;i<MAX_KEY;i++){ LH1BZ(5g  
  if(hCallWnd!=NULL){ +X{cN5Y K  
   if(!IsWindow(hCallWnd)){ UX+?0K  
    hCallWnd=NULL; ,(zcl$A[  
    HotKey=0;  U5T^S  
    HotKeyMask=0; ..sJtA8  
    KeyCount--; 9Vh_XBgP  
   } ~ly`u  
  } $=X!nQ& Z|  
 } @faF`8LwA  
} MX%|hIOpr  
}"!6Xm  
BOOL CHookApp::InitInstance() i@sCMCu6  
{ Z{j!s6Y@{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Iht mD@H}  
 hins=AfxGetInstanceHandle(); 4"`=huQ  
 InitHotkey(); GA}hp%  
 return CWinApp::InitInstance(); kjQIagw  
} /6?tgr  
eU<]h>2  
int CHookApp::ExitInstance() w/)e2CH  
{ ;w>Q{z  
 VerifyWindow(); KI^q 5D ?  
 UnInit(); @*AYm-k  
 return CWinApp::ExitInstance(); Ss*Lg K_  
} R A-^!4tX  
~M|NzK_9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `K@5_db\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >c~9wv  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~{kA) :  
#if _MSC_VER > 1000 Uj y6vgU;  
#pragma once x`b~ZSNJ%  
#endif // _MSC_VER > 1000 `Nxo0Q  
Ej9/_0lt  
class CCaptureDlg : public CDialog W\ZV0T;<]  
{ fwz5{>ON]  
 // Construction D"1vw<Ak  
 public: Zi15wE  
  BOOL bTray; 1D#T+t`[  
  BOOL bRegistered; 2\kC_o97  
  BOOL RegisterHotkey(); VhJyWH%(  
  UCHAR cKey; @Wlwt+;fT  
  UCHAR cMask; i:NJ>b  
  void DeleteIcon(); 1`7]C+Pv  
  void AddIcon(); +"*l2E]5  
  UINT nCount; IDL^0:eg<.  
  void SaveBmp(); l#< }|b  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor BHiw!S<  
  // Dialog Data S0X.8Bq  
  //{{AFX_DATA(CCaptureDlg) ^$T!@ +:  
  enum { IDD = IDD_CAPTURE_DIALOG }; .F=<r-0  
  CComboBox m_Key; MC[ `<W)u  
  BOOL m_bControl; H-PW(  
  BOOL m_bAlt; 3/#R9J#  
  BOOL m_bShift; <%5-Pzp  
  CString m_Path; ` :B  
  CString m_Number; kfG65aa>_  
  //}}AFX_DATA [7ek;d;'t  
  // ClassWizard generated virtual function overrides h|Teh-@A5  
  //{{AFX_VIRTUAL(CCaptureDlg) ;8 /+wBnm  
 public: +)''l  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  `i_L?C7  
 protected: h<!khWFS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /I`!i K  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -hJ>wGI  
  //}}AFX_VIRTUAL HquB*=^xh  
  // Implementation n8y,{|  
 protected: \I`=JKYT  
  HICON m_hIcon; 6>P  
  // Generated message map functions xhp-4  
  //{{AFX_MSG(CCaptureDlg) 6O[wVaC1u  
  virtual BOOL OnInitDialog(); C$]%1<-Iv]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,sQ0atk7ma  
  afx_msg void OnPaint(); Ra15d^  
  afx_msg HCURSOR OnQueryDragIcon(); o 0cc+  
  virtual void OnCancel(); (,)vak&t  
  afx_msg void OnAbout(); ^~*[~  
  afx_msg void OnBrowse(); _g/T H-;^  
  afx_msg void OnChange(); (Mire%$h  
 //}}AFX_MSG '"G %0y  
 DECLARE_MESSAGE_MAP() +h9l %Pz  
}; + X|m>9  
#endif GhfUCW%  
u3v6$CD?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `mHOgS>|  
#include "stdafx.h" Z ^9{Qq  
#include "Capture.h" AcfkY m~  
#include "CaptureDlg.h" X?k V1  
#include <windowsx.h> "gl:4|i '  
#pragma comment(lib,"hook.lib") GwIfGixqH  
#ifdef _DEBUG JWm^RQ  
#define new DEBUG_NEW @{$Cv"6769  
#undef THIS_FILE r>:7${pF  
static char THIS_FILE[] = __FILE__; M& BM,~  
#endif ~jCpL@rS  
#define IDM_SHELL WM_USER+1 8BoT%kVeJv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &j~|3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .]sIoB-54  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \i;~~;D  
class CAboutDlg : public CDialog 1\.zOq#  
{ CFS3);'<|  
 public: /B#lju!  
  CAboutDlg(); *~lgU4  
  // Dialog Data )DZ-vnZ#t0  
  //{{AFX_DATA(CAboutDlg) ?3E_KGI  
  enum { IDD = IDD_ABOUTBOX }; tX`[6`  
  //}}AFX_DATA ~m;MM)_V  
  // ClassWizard generated virtual function overrides nluyEK  
  //{{AFX_VIRTUAL(CAboutDlg) 4\eX=~C>:  
 protected: BC0c c[x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6/WK((Fd  
  //}}AFX_VIRTUAL K1wN9D{t'  
  // Implementation G*w W&R)  
 protected: re 1k]  
  //{{AFX_MSG(CAboutDlg) g:3'x/a1  
  //}}AFX_MSG A>1p]#  
  DECLARE_MESSAGE_MAP() r)@&2b"q  
}; ("M#R!3  
|% YzGgp7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :,z3 :PL  
{ zt>_)&b  
 //{{AFX_DATA_INIT(CAboutDlg) *e"GQd?  
 //}}AFX_DATA_INIT X!A]V:8dk  
} sz2SWk^&  
r/$)c_x`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 22|M{  
{ LXfeXWw?,  
 CDialog::DoDataExchange(pDX); { `|YX_HS  
 //{{AFX_DATA_MAP(CAboutDlg) ,5+X%~'  
 //}}AFX_DATA_MAP j'Q-*-3  
} {'Qk>G s  
"i<3}6/*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) MHT,rqG  
 //{{AFX_MSG_MAP(CAboutDlg) w5/  X {  
 // No message handlers `zOAltfd  
 //}}AFX_MSG_MAP <B{VL8IA>  
END_MESSAGE_MAP() Wv*BwiQ  
,m'#>d&zO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /B?SaKh  
: CDialog(CCaptureDlg::IDD, pParent) Jc#)T;# 6  
{ *Wo$ $T  
 //{{AFX_DATA_INIT(CCaptureDlg) /E  yg*#  
  m_bControl = FALSE; ?m r@B  
  m_bAlt = FALSE; "M#`y!__  
  m_bShift = FALSE; W;}u 2GH  
  m_Path = _T("c:\\");  |ukdn2Q  
  m_Number = _T("0 picture captured."); bz@=zLBt  
  nCount=0; 'GdlqbX(%  
  bRegistered=FALSE; J ]^gF|  
  bTray=FALSE; A%8`zR  
 //}}AFX_DATA_INIT uV$d7(N}"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &*:)5F5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7LZb*+>  
} y<x_v )k-  
JO6vzoS3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <7-,`   
{ = Vr[V@  
 CDialog::DoDataExchange(pDX); ?UhAjtYIS  
 //{{AFX_DATA_MAP(CCaptureDlg) W me1w\0  
  DDX_Control(pDX, IDC_KEY, m_Key); >,]e[/p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); \ui~n:aWJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :a!a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \V- Y,!~5  
  DDX_Text(pDX, IDC_PATH, m_Path); it|:P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e^Wv*OD'  
 //}}AFX_DATA_MAP KXbYv62  
} F$yFR  
#cF8)GC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ao5yW;^y  
//{{AFX_MSG_MAP(CCaptureDlg) ^V,/4u  
 ON_WM_SYSCOMMAND() *>*/|  
 ON_WM_PAINT() ?,e:c XhE2  
 ON_WM_QUERYDRAGICON() Bv]wHPun  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JP*wi-8D  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y'H/ $M N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) xdU pp~}+.  
//}}AFX_MSG_MAP _$_CR\$  
END_MESSAGE_MAP() T q; "_s  
v%~ViOgL\  
BOOL CCaptureDlg::OnInitDialog() |nZB/YZt  
{ 5*za]   
 CDialog::OnInitDialog(); c(g^*8Pb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $"n)C  
 ASSERT(IDM_ABOUTBOX < 0xF000);  k*6eZ7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [a*>@IR  
 if (pSysMenu != NULL) ]BD5+>;  
 { ~{$'sp0  
  CString strAboutMenu; aYCzb7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4xn^`xf9  
  if (!strAboutMenu.IsEmpty()) a} 7KpKCD  
  { #UeU:RJ1  
   pSysMenu->AppendMenu(MF_SEPARATOR); @gGuV$Mw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {QkH%jj  
  } +~.Jw#HqS  
 } a2_IF,p*?  
 SetIcon(m_hIcon, TRUE); // Set big icon \~j(ui|  
 SetIcon(m_hIcon, FALSE); // Set small icon ]_xGVwem  
 m_Key.SetCurSel(0); 0]0M>vx u  
 RegisterHotkey(); l8lR5<  
 CMenu* pMenu=GetSystemMenu(FALSE); .Tqvy)'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wTbIS~!gF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VOOThdR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yVv3S[J  
 return TRUE; // return TRUE unless you set the focus to a control !)3Su=*R  
} ):EXh#  
PH &ms  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $^ dk>Hj>4  
{ / hdl  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) rX}==`#\  
 { J0bs$  
  CAboutDlg dlgAbout; Yaepy3F  
  dlgAbout.DoModal(); ~'\u:Imuo  
 } 3? CpylCO  
 else R}<s~` Pl  
 { JY8pV+q @=  
  CDialog::OnSysCommand(nID, lParam); ]h$TgX  
 } j=QjvWD  
} &c ~)z\$  
X^^D[U  
void CCaptureDlg::OnPaint() /UyE- "S  
{ SP1oBR"3  
 if (IsIconic()) N |L5Ru  
 { A8Y~^wn  
  CPaintDC dc(this); // device context for painting T`[ZNq+${  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )`7h,w J[1  
  // Center icon in client rectangle ,dMi+c`ax  
  int cxIcon = GetSystemMetrics(SM_CXICON); dj**,*s  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]>T/Gl1  
  CRect rect; ZWEzL$VWi  
  GetClientRect(&rect); ) hB*Hjh  
  int x = (rect.Width() - cxIcon + 1) / 2; <L#r6y~H  
  int y = (rect.Height() - cyIcon + 1) / 2; t4f\0`jN  
  // Draw the icon VO?NrKyeW  
  dc.DrawIcon(x, y, m_hIcon); :?W:'% (`[  
 } 8[IifF1M=&  
 else &" n9,$  
 { SVz.d/3Y  
  CDialog::OnPaint(); }CqIKoX.  
 } zKT<QM!`  
} 8}@a?QS(&  
-e\56%\~_  
HCURSOR CCaptureDlg::OnQueryDragIcon() Vk T3_f  
{ ZA@"uqa6b  
 return (HCURSOR) m_hIcon; G dY^}TJrh  
} "S#hzrEdYI  
z H4#\d  
void CCaptureDlg::OnCancel() 7J/3O[2  
{ A*;h}\n  
 if(bTray) aX:$Q }S  
  DeleteIcon(); 6* w;xf  
  CDialog::OnCancel(); _ RT}Ee}Y  
} [wYQP6Cyy  
mn` Ae=  
void CCaptureDlg::OnAbout() HEN9D/O=  
{ U %l{>*q  
 CAboutDlg dlg; z8MYgn 7  
 dlg.DoModal(); ? GW3E  
} e0 EJ[bG  
F4Z0g*^x  
void CCaptureDlg::OnBrowse() ,/9|j*9H  
{ Jq)k?WS  
 CString str; vj0?b/5m  
 BROWSEINFO bi; >?<d}9X  
 char name[MAX_PATH]; Xw5" JE!.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); z"`?<A&u  
 bi.hwndOwner=GetSafeHwnd(); yRDLg c  
 bi.pszDisplayName=name; VvKH]>*  
 bi.lpszTitle="Select folder"; `#U6`[[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +__Rk1CVh  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); cKAl 0_[f"  
 if(idl==NULL) na)ceN2h  
  return; T94$}- 5/)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q5JeL6t  
 str.ReleaseBuffer(); +^:K#S9U  
 m_Path=str; 1cega1s3xR  
 if(str.GetAt(str.GetLength()-1)!='\\') x]T;W&s  
  m_Path+="\\"; u{ /gjv  
 UpdateData(FALSE); SYx)!n6U  
} Mk;j"ZD F  
0}N^l=jQ  
void CCaptureDlg::SaveBmp() Fsh-a7Qp  
{ plAt +*&  
 CDC dc; ;k]pq4E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?9A[;j|a0  
 CBitmap bm; y5}|Y{5  
 int Width=GetSystemMetrics(SM_CXSCREEN); HDOaN  
 int Height=GetSystemMetrics(SM_CYSCREEN); HY:n{= o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ok'1  
 CDC tdc; k=[R o  
 tdc.CreateCompatibleDC(&dc); 2rM i~8 T  
 CBitmap*pOld=tdc.SelectObject(&bm); k@'.d)y0`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?hYe4tc-#  
 tdc.SelectObject(pOld); :QNEA3Q  
 BITMAP btm; &$[{L)D  
 bm.GetBitmap(&btm); P@#6.Bb#V  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &\r%&IX/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $? Rod;  
 BITMAPINFOHEADER bih; \ZB;K~BV&  
 bih.biBitCount=btm.bmBitsPixel; ?~Des"F6)1  
 bih.biClrImportant=0; - _(!  
 bih.biClrUsed=0; zO,sq%vQn'  
 bih.biCompression=0; /^"TMm   
 bih.biHeight=btm.bmHeight; .wywO|  
 bih.biPlanes=1; >xN^#$ng}  
 bih.biSize=sizeof(BITMAPINFOHEADER); gUcE,L  
 bih.biSizeImage=size;  CgWj9 [  
 bih.biWidth=btm.bmWidth; >KJ]\`2>)c  
 bih.biXPelsPerMeter=0; gMbvHlT  
 bih.biYPelsPerMeter=0; Z[VKB3Pb8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g@L4G?hLn  
 static int filecount=0; RWE%? `   
 CString name; K^ lVng  
 name.Format("pict%04d.bmp",filecount++); Gex^\gf  
 name=m_Path+name; frt?*|:  
 BITMAPFILEHEADER bfh; {T9g\F*  
 bfh.bfReserved1=bfh.bfReserved2=0; kMA>)\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U Lq%,ca  
 bfh.bfSize=54+size; jWz-7BO  
 bfh.bfOffBits=54; \?Z dUY  
 CFile bf; JcP'+@X"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nJnan,`W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7>'F=}6[Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g=.5*'Xlp  
  bf.WriteHuge(lpData,size); c/u;v69r  
  bf.Close(); lMP7o&  
  nCount++; F-6* BUqJ  
 } @N$r'@  
 GlobalFreePtr(lpData); WBGYk);  
 if(nCount==1) k)J7) L  
  m_Number.Format("%d picture captured.",nCount); k1<Py$9"  
 else fiZ8s=J  
  m_Number.Format("%d pictures captured.",nCount); c?d#Bj ?  
  UpdateData(FALSE); TJ<PT  
} E$T#o{pai  
_rM%N+$&d_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  >Pu*MD;  
{ (bw;zNW  
 if(pMsg -> message == WM_KEYDOWN) P|?z1JUd  
 { R[(,wY_1  
  if(pMsg -> wParam == VK_ESCAPE) H_Yy.yi  
   return TRUE; =cQw R:):  
  if(pMsg -> wParam == VK_RETURN) qz:OnQv!  
   return TRUE; <i5^izg  
 } [q z6_WOo  
 return CDialog::PreTranslateMessage(pMsg); aj\'qRrU$  
} sM-*[Q=_  
MG6Tk(3S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /H)g<YA  
{ iw{n|&Y#`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ cA*%K[9  
  SaveBmp(); {MS&t09Wh  
  return FALSE; E*%{Nn  
} k}/: xN"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !\m.&lk'^  
 CMenu pop; d09GD[5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xqr`T0!&  
 CMenu*pMenu=pop.GetSubMenu(0); UaBR;v-.B3  
 pMenu->SetDefaultItem(ID_EXITICON); kBT uM"  
 CPoint pt; \S9z.!7v$  
 GetCursorPos(&pt); #O~Y[''C5X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Bw$-*FYE  
 if(id==ID_EXITICON) JsC0^A;fM  
  DeleteIcon(); *,. {Xf  
 else if(id==ID_EXIT) 4Vs;Y&t]  
  OnCancel(); Q -+jG7vT  
 return FALSE; ,iyIF~1~#>  
} X:Zqgf  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [H& m@*UO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ; ^$RG  
 AddIcon(); )sQbDA|p  
 return res; Ub"\LUu  
} 8c~H![2u  
&.}zZ/  
void CCaptureDlg::AddIcon() ] !H<vR$8  
{ #G,e]{gs  
 NOTIFYICONDATA data; MLDuo|?  
 data.cbSize=sizeof(NOTIFYICONDATA); m4iR '~L}  
 CString tip; ]mc,FlhU@  
 tip.LoadString(IDS_ICONTIP); B5cTzY.h-  
 data.hIcon=GetIcon(0); ~7m+cWC-+  
 data.hWnd=GetSafeHwnd(); CR/LV]G  
 strcpy(data.szTip,tip); $qvNv[  
 data.uCallbackMessage=IDM_SHELL; Eg9502Bl~8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _+{s^n=  
 data.uID=98; ql8:s>1T  
 Shell_NotifyIcon(NIM_ADD,&data); s(dox; d  
 ShowWindow(SW_HIDE); G$Dg*<  
 bTray=TRUE; +X< Z 43  
} }"T:z{n  
a-W&/  
void CCaptureDlg::DeleteIcon() (*EN!-/  
{ Ii9vA ^53  
 NOTIFYICONDATA data; D,7! /u'  
 data.cbSize=sizeof(NOTIFYICONDATA); #8`G&S*  
 data.hWnd=GetSafeHwnd(); R 'F|z{8  
 data.uID=98; V;z?m)ur  
 Shell_NotifyIcon(NIM_DELETE,&data); QK72 F  
 ShowWindow(SW_SHOW);  A=,m  
 SetForegroundWindow(); X[|>r@Aa!  
 ShowWindow(SW_SHOWNORMAL); ugCc&~`  
 bTray=FALSE; >hXUq9;:  
} N&n{R8=^"  
ILQg@J l  
void CCaptureDlg::OnChange() ":Q70*xSm  
{ us]ah~U6A  
 RegisterHotkey(); xj}N;FWo  
} 7yc:=^ )  
?]})Xf.A  
BOOL CCaptureDlg::RegisterHotkey() [AU1JO`\"  
{ X2{3I\'Ft  
 UpdateData(); Q=dR[t>^  
 UCHAR mask=0; l`1ZS8 [.  
 UCHAR key=0; hOq1 "kL  
 if(m_bControl) ' Sl9xd  
  mask|=4; E>ev/6ox  
 if(m_bAlt) "}!vYr  
  mask|=2; ?gkK*\x2  
 if(m_bShift) *8Lym,]  
  mask|=1; kTzZj|l^\  
  key=Key_Table[m_Key.GetCurSel()]; PvM<#zq_  
 if(bRegistered){ @<Y Za$`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d ] [E;$  
  bRegistered=FALSE; sC#Ixq'ls7  
 } (d (whlF  
 cMask=mask; M,9WF)p)V  
 cKey=key; CN >q`[!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `*slQ }i  
 return bRegistered; t;*'p  
} cB<Zez  
gt ?&!S^  
  四、小结 T.xW|Iwx  
.OjJK?  
  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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