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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: gVI*`$  
  r":<1+07  
  一、实现方法 h]zx7zt-  
?]7ITF  
  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:  6f{c  
eFeeloH?e*  
#pragma data_seg("shareddata") `i.f4]r  
HHOOK hHook =NULL; //钩子句柄 f|q6<n_nM  
UINT nHookCount =0; //挂接的程序数目 Dn6DkD!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O&O1O> [p1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 h]D=v B  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :s$9#}hw,  
static int KeyCount =0; d-?~O~qD|!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }U #S*  
#pragma data_seg() (Hn,}(3S  
h{h=',o1  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 60p1.;' /a  
v h%\ " h  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Z4(2&t^  
nrf%/L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =LT({8  
cKey,UCHAR cMask) F*NIs:3;  
{ Dgkt-:S/T|  
 BOOL bAdded=FALSE; d?S<h`{x   
 for(int index=0;index<MAX_KEY;index++){ 7C 4Njei"  
  if(hCallWnd[index]==0){ Np=*B_ @8  
   hCallWnd[index]=hWnd; U5"F1CaW~  
   HotKey[index]=cKey; @lmke>  
   HotKeyMask[index]=cMask; nTHP~]  
   bAdded=TRUE; )*_YeT&w.  
   KeyCount++; @*_K#3  
   break; g`Rs;  
  } Xpa;F$VI  
 } ,O-lDzcw  
 return bAdded; AOfQqGf  
} F`ihw[ Wn  
//删除热键 dyx 4_!fO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q \{\u J x  
{ $>BP}V33  
 BOOL bRemoved=FALSE; bqe;) A7  
 for(int index=0;index<MAX_KEY;index++){ bh_ALu^CSX  
  if(hCallWnd[index]==hWnd){ Onc!5L  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G!Uq#l>  
    hCallWnd[index]=NULL; s/T5aJR  
    HotKey[index]=0; Dnp^yqz*  
    HotKeyMask[index]=0; huQ1A0(no  
    bRemoved=TRUE; pH*L8tT  
    KeyCount--; O{dx+f  
    break; 2N]y)S_<V  
   } Ny~;"n  
  } TQEZ<B$  
 } kNjbpCE\!  
 return bRemoved; }5]NUxQ_  
} *i n_Z t3  
HK-?<$Yc  
|_ @iaLE  
  DLL中的钩子函数如下: gVD!.  
$Z(zO;k.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r*3;gyG.,#  
{ m.$Oo Mu'  
 BOOL bProcessed=FALSE; {-E{.7  
 if(HC_ACTION==nCode) F(w>lWs;  
 { 4s"HO/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 O-G@To3\  
   switch(wParam) iA< EJ  
   {  eR}d"F4W  
    case VK_MENU: RM`8P5i]sF  
     MaskBits&=~ALTBIT; 62zlO{ >rJ  
     break; kO5KZ;+N-  
    case VK_CONTROL: U{R*WB b  
     MaskBits&=~CTRLBIT; y=&)sq  
     break; k9bU<  
    case VK_SHIFT: >a0;|;hp  
     MaskBits&=~SHIFTBIT; 0P)c)x5  
     break; te:VYP  
    default: //judge the key and send message w"sRK  
     break; Y# lE  
   } #?-W.  
   for(int index=0;index<MAX_KEY;index++){ #F9$"L1Hg  
    if(hCallWnd[index]==NULL) @-7K~in?^  
     continue; 1X{A}9nA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "RG.vo7b  
    { &{ f5F7E@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FIS-xpv$  
     bProcessed=TRUE; *(HH71Y  
    } c]n4vhUa5  
   } XRz.R/  
  } ` Y ut 1N  
  else if((lParam&0xc000ffff)==1){ //有键按下 u ) ld  
   switch(wParam) VJNPs6  
   { L,l+1`Jz  
    case VK_MENU: Gm|QOuw  
     MaskBits|=ALTBIT; }tJ:-!*2  
     break; bVVa5? HP  
    case VK_CONTROL: T JVNR_x  
     MaskBits|=CTRLBIT; @4Y>)wn&;  
     break; `n_ Z  
    case VK_SHIFT: Y6CadC  
     MaskBits|=SHIFTBIT; i&l$G55F  
     break; ``Nj Nd  
    default: //judge the key and send message CHLMY}O0  
     break; Kc(_?`  
   } c"QI`;D_c  
   for(int index=0;index<MAX_KEY;index++){ MBg^U<t8  
    if(hCallWnd[index]==NULL) s$]I@;_  
     continue; x:@e ID  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1'g?B`  
    { .N5"IY6>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -Rf|p(SJ,E  
     bProcessed=TRUE; adxJA}K}  
    } bEy%S "\<  
   } <n#JOjHV  
  } C f+O7Y`^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 q|j;dI&  
   for(int index=0;index<MAX_KEY;index++){ @!F9}n AP  
    if(hCallWnd[index]==NULL) 7N""w5  
     continue; NeWssSje  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q=EQDHmh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /bw-*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 S-L6KA{  
   } hQk mB|];5  
  } Ge @d"  
 } NyGF57v[M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bLUn0)c  
} hMDyE.X-  
D_8hn3FH  
  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: -7yX>Hjl  
:<jf}[w!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7'<4'BGzl]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G3e%~  
^ZV xBQKg  
  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: ;Lu}>.t  
9\"~G)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6 HEl1FK{@  
{ ;or> Sh7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) f.u{;W  
 { ,%:`Ll t]$  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 -Pvt+I>  
  SaveBmp(); {=(4  
  return FALSE; A,iXiDb3pK  
 } w}E?FEe.  
 …… //其它处理及默认处理 1]kk  
} a`{'u)@  
;1y\!f3#V~  
UjfB+=7I{L  
  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。 x^;n fqn|  
1E-$f  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 `SU;TN0  
AHLDURv  
  二、编程步骤 !YoKKG~_0  
7eq;dNB@gq  
  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"; . XY'l  
$)uQ%/DH>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; E+>;tLw3j  
jALo;PDJ  
  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; `q/y|/v<  
im?nR+t+X  
  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; g)"6|Z?D"  
 ,cB`j7p(  
  5、 添加代码,编译运行程序。 D2hvf ^g'*  
M,[ClQ 9  
三、程序代码 dNyc|P`U  
!cq4+0{O;&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Sj*H4ZHD<&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <^&'r5H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ sO*6F`eiZ  
#if _MSC_VER > 1000 HY42G#^  
#pragma once SHaZ-d  
#endif // _MSC_VER > 1000 vuK 5DG4  
#ifndef __AFXWIN_H__ SY{J  
#error include 'stdafx.h' before including this file for PCH mH hm~u  
#endif ]A\n>Z!;  
#include "resource.h" // main symbols K;Xn!:) V:  
class CHookApp : public CWinApp E6G^?k~q  
{ {7;T Q?/  
 public: :DZiDJ@  
  CHookApp(); 6?Wsg`9  
  // Overrides fY `A  
  // ClassWizard generated virtual function overrides d*G $qUiX  
  //{{AFX_VIRTUAL(CHookApp) 2<'gX>TW  
 public: $X{& KLM[  
  virtual BOOL InitInstance(); [R~HhM  
  virtual int ExitInstance(); ZWFH5#=  
  //}}AFX_VIRTUAL J d`NS3;*p  
  //{{AFX_MSG(CHookApp) *"4ltWS  
  // NOTE - the ClassWizard will add and remove member functions here. b_LzG_n!   
  // DO NOT EDIT what you see in these blocks of generated code ! d`xqs,0f  
  //}}AFX_MSG 65}:2l2<  
  DECLARE_MESSAGE_MAP()  $SDx) '!  
}; !F%dE!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gi`ZFq@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +I')>6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U_J|{*4S.!  
BOOL InitHotkey(); OO@$jXZB  
BOOL UnInit(); _6|b0*jv'&  
#endif Zw3|HV(so  
;xRyONt  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9DT}sCLz:B  
#include "stdafx.h" d EXw=u  
#include "hook.h" zL{KK9Or  
#include <windowsx.h> kn<[v;+  
#ifdef _DEBUG ?LW1D+  
#define new DEBUG_NEW 1k7E[G~G|  
#undef THIS_FILE F8k1fmM]Y  
static char THIS_FILE[] = __FILE__; isN"7y|r:X  
#endif FYi<+]HZ  
#define MAX_KEY 100 q80?C.,`  
#define CTRLBIT 0x04 ;CC[>  
#define ALTBIT 0x02 g"!B |  
#define SHIFTBIT 0x01  t9=rr>8)  
#pragma data_seg("shareddata") |?0C9  
HHOOK hHook =NULL; ;m\(fW*ii  
UINT nHookCount =0; QOOBCNe  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 9:m+mpL=9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6tJM*{$$H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |_A35"v  
static int KeyCount =0; 1wq 6E  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -}>Q0d)  
#pragma data_seg() Z2ZS5a  
HINSTANCE hins; c2i^dNp_  
void VerifyWindow(); QTDI^ZeuF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @Wv*`  
//{{AFX_MSG_MAP(CHookApp) 'E@D  
// NOTE - the ClassWizard will add and remove mapping macros here. AvwX 2?tc  
// DO NOT EDIT what you see in these blocks of generated code! T|=8 jt,  
//}}AFX_MSG_MAP E;X'.7[c  
END_MESSAGE_MAP() 's9)\LS>p  
sPhh#VCw{  
CHookApp::CHookApp() +F@9AO>LF  
{ $DQMN  
 // TODO: add construction code here,  g6~uf4;  
 // Place all significant initialization in InitInstance h;Bol  
} :xA'X+d/'  
SAqX[c  
CHookApp theApp; PeG8_X}u9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >97V2W  
{ 08twcY;&k  
 BOOL bProcessed=FALSE; )D@ NX/}  
 if(HC_ACTION==nCode) Y/4B*>kl  
 { : |Z*aI]9  
  if((lParam&0xc0000000)==0xc0000000){// Key up Nc7YMxk'H  
   switch(wParam) .IgCC_C9  
   { Hu;#uAnxQ  
    case VK_MENU: a([cuh.  
     MaskBits&=~ALTBIT; ruA!+@or  
     break; S4\T (  
    case VK_CONTROL: hxv/285B  
     MaskBits&=~CTRLBIT; x;C\G`9N  
     break; ge E7<"m%  
    case VK_SHIFT: '91Ak,cWB  
     MaskBits&=~SHIFTBIT; !]"T`^5,Y  
     break; cLXMq"?C  
    default: //judge the key and send message uYs+x X_  
     break; *f,EDSN1@d  
   } %II |;<  
   for(int index=0;index<MAX_KEY;index++){ =T+<>/[  
    if(hCallWnd[index]==NULL) jbG #__#_  
     continue; ~< k'{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8J>s|MZ  
    { .<tb*6rX>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PB`94W  
     bProcessed=TRUE; 6.k2,C4dT<  
    } 9 Z4H5!:(  
   } T%:}/@  
  } YUc&X^O  
  else if((lParam&0xc000ffff)==1){ //Key down 76hi@7a  
   switch(wParam) :lcoSJ  
   { "eBpSV>nnQ  
    case VK_MENU: Y(-+>>j_  
     MaskBits|=ALTBIT; >`t |a  
     break; /Jo*O=Lpo  
    case VK_CONTROL: f):|Ad|  
     MaskBits|=CTRLBIT; O* 7" Q&  
     break; -()CgtSR  
    case VK_SHIFT: AJj6@hi2P  
     MaskBits|=SHIFTBIT; p! Hpq W  
     break; tQ*5[F,fm  
    default: //judge the key and send message QupCr/Hs  
     break; zEa3a  
   } `~gyq>Ik2  
   for(int index=0;index<MAX_KEY;index++) ] @IzJz"R  
   { \[Q,>{^  
    if(hCallWnd[index]==NULL) WJl&Vyl2FL  
     continue; ZX'/[wAN)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1YQ|KJ*K  
    { >8QLo8)3C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t.3b\RV[  
     bProcessed=TRUE; k|&@xEbS  
    } MvQ0"-ZQ  
   } 0b4QcfB1[  
  } X\uN:;?#W{  
  if(!bProcessed){ _O)~<Sk-*z  
   for(int index=0;index<MAX_KEY;index++){ QKe=/;  
    if(hCallWnd[index]==NULL) HD$W\P  
     continue; {wK98>$a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rry 33  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `2}Mz9mk  
   } C?X^h{T p  
  } lNqYpyvy*  
 } =%p0r z|b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )88z=5.  
} va| 1N/&  
LG@5Z-  
BOOL InitHotkey() L%Me wU0TZ  
{ oS, %L  
 if(hHook!=NULL){ =M>pL+#  
  nHookCount++; F!'y47QD  
  return TRUE; tpU[KR[-  
 } *i&ks> 4N  
 else bF<FX_}!s!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8|HuxE  
  if(hHook!=NULL) }H\wed]F/  
   nHookCount++; M2{{B ^*$6  
  return (hHook!=NULL); ' FF@I^O  
} REli`"bR  
BOOL UnInit() yd'>Mw  
{ r 1nl!  
 if(nHookCount>1){ ;3 O0O  
  nHookCount--; 1o V\QK&  
  return TRUE; 7"FsW3an  
 } x}{/) ?vC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1@egAo)  
 if(unhooked==TRUE){ 1 VcZg%I  
  nHookCount=0; 0p)#!$  
  hHook=NULL; $@s&qi_&R  
 } I ze+](  
 return unhooked; ]-&A )M6  
} V+(1U|@~  
!0i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  $TGE  
{ <Y9%oJn%  
 BOOL bAdded=FALSE; A_i=hj 2f  
 for(int index=0;index<MAX_KEY;index++){ 9rf6,hF  
  if(hCallWnd[index]==0){ 'H0uvvhOp  
   hCallWnd[index]=hWnd; k+t?EZ6L  
   HotKey[index]=cKey; j KGfm9|zj  
   HotKeyMask[index]=cMask; [vrM,?X  
   bAdded=TRUE; ;=fOyg  
   KeyCount++; \oA>%+]5  
   break; 3rBSwgRl  
  } g Y|f[M|  
 } \!x~FVA  
 return bAdded; oSq?. *w<  
} ark~#<SqAr  
#rD0`[pz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) clV3x` z  
{ db -h=L|  
 BOOL bRemoved=FALSE; >g+yw1nC  
 for(int index=0;index<MAX_KEY;index++){ ~4fUaMT  
  if(hCallWnd[index]==hWnd){ ;SnpD)x@)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f{mWy1NH\  
    hCallWnd[index]=NULL; \,&,Q  
    HotKey[index]=0; P;4Y%Dq~Qo  
    HotKeyMask[index]=0; 6Cfu19Dx  
    bRemoved=TRUE; Lyo!}T  
    KeyCount--; Vsw] v  
    break; C9OEB6  
   } e ?sMOBPlv  
  } nvY%{Zf$}  
 } \MI2^J N  
 return bRemoved; j*Uz.q?  
} 69N/_V  
>xsbXQ>.  
void VerifyWindow() 41Ga-0p  
{ w`KqB(36  
 for(int i=0;i<MAX_KEY;i++){ Lz6b9W  
  if(hCallWnd!=NULL){ F#-mseKhc  
   if(!IsWindow(hCallWnd)){ ",O |uL  
    hCallWnd=NULL; >8M=RE n4  
    HotKey=0; Bie#GKc  
    HotKeyMask=0; =>3wI'I  
    KeyCount--; # 0kVhx7%  
   } Is&0h|  
  } 8z1#Q#5  
 } WVZ](D8Gc]  
} [`J91=  
r ]s7a?O  
BOOL CHookApp::InitInstance() 3EkCM_]  
{ +{#65 z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); OEi u,Y|@l  
 hins=AfxGetInstanceHandle(); >f$N G  
 InitHotkey(); #K#BNpG|  
 return CWinApp::InitInstance(); /|s~X@%K  
} RD6n1Wb(@  
Cfs2tN  
int CHookApp::ExitInstance() vG'6?%38  
{  3-~*  
 VerifyWindow(); _nwsIjsW  
 UnInit(); WoV"&9y  
 return CWinApp::ExitInstance(); }Wlm#t  
} L h@0|k  
c~``)N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file f4 k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e'I/}J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (/gv U80  
#if _MSC_VER > 1000 c V$an  
#pragma once $Z|HFV{  
#endif // _MSC_VER > 1000 b!p]\B!  
NMs 8^O|0  
class CCaptureDlg : public CDialog r{cmw`WA/P  
{ [g<Y,0,J  
 // Construction I|n? 32F  
 public: =y^`yv 3  
  BOOL bTray; \qf0=CPw8  
  BOOL bRegistered; kz_gR;"(Z  
  BOOL RegisterHotkey(); z( \4{Y  
  UCHAR cKey; M}fk[Yr>  
  UCHAR cMask; $-=xG&fSz  
  void DeleteIcon(); B%7Az!GX  
  void AddIcon(); / f5q9sp8  
  UINT nCount; Iip%er%b  
  void SaveBmp(); dl]pdg<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y5{KtW  
  // Dialog Data I=[Ir8} ;  
  //{{AFX_DATA(CCaptureDlg) 9| g]M:{  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'GI| t  
  CComboBox m_Key; m>{a<N  
  BOOL m_bControl; -=cxUDB  
  BOOL m_bAlt; TUBpRABH  
  BOOL m_bShift; {=%,NwPs  
  CString m_Path; aP$it 6Z  
  CString m_Number; n nOgmI7  
  //}}AFX_DATA 8TBv~Q u  
  // ClassWizard generated virtual function overrides FMOO  
  //{{AFX_VIRTUAL(CCaptureDlg) $-)T  
 public: @ D,]v:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); v!`:{)2C  
 protected: &HQ_e$1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $PstEL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?:tk8Kgf  
  //}}AFX_VIRTUAL gc\/A\F<  
  // Implementation <78*-Ob  
 protected: 5jq @ nq6  
  HICON m_hIcon; kzk8b?rOA  
  // Generated message map functions jn4|gQ  
  //{{AFX_MSG(CCaptureDlg) "4IrW6B $9  
  virtual BOOL OnInitDialog(); W:maE9E=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^sKdN-{  
  afx_msg void OnPaint(); (_%l[:o6  
  afx_msg HCURSOR OnQueryDragIcon(); s\zY^(v4  
  virtual void OnCancel(); 3,'LW}  
  afx_msg void OnAbout(); qRSoF04!R  
  afx_msg void OnBrowse(); w}]BJ<C  
  afx_msg void OnChange(); 0QP=$X  
 //}}AFX_MSG BOOb{kcg  
 DECLARE_MESSAGE_MAP() (|\%)v H-  
}; C$0rl74Wi  
#endif 2qdc$I&$  
sYhHh$mwA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file GbC@ |  
#include "stdafx.h" BG6.,'~7o  
#include "Capture.h" 6gabnW3  
#include "CaptureDlg.h" v2IcDz`}7  
#include <windowsx.h> CcTdLq  
#pragma comment(lib,"hook.lib") (mr*Thy`@  
#ifdef _DEBUG +zwS[P@  
#define new DEBUG_NEW :_,a%hb+8  
#undef THIS_FILE 9Af nMD  
static char THIS_FILE[] = __FILE__; ~470LgpO1  
#endif u6 QW*8b4  
#define IDM_SHELL WM_USER+1 4.Q[Tu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <.#jp([W>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \gu8 ~zK  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 2n+ud ?|l  
class CAboutDlg : public CDialog w\mTug  
{ mGDy3R90  
 public: 8.G<+.  
  CAboutDlg(); 1Ys)b[:  
  // Dialog Data \QQWhwE  
  //{{AFX_DATA(CAboutDlg) &xt[w>/i  
  enum { IDD = IDD_ABOUTBOX }; w~_ycY.e  
  //}}AFX_DATA 2 OV$M~  
  // ClassWizard generated virtual function overrides l{*m-u5&;  
  //{{AFX_VIRTUAL(CAboutDlg) pIV |hb!G  
 protected: <FX ]n<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rK3KxG  
  //}}AFX_VIRTUAL .sc80i4  
  // Implementation ^W(ue]j}o  
 protected: L8q#_k  
  //{{AFX_MSG(CAboutDlg) g&S> Wq%L  
  //}}AFX_MSG fW Pa1E@  
  DECLARE_MESSAGE_MAP() *s#6e}  
}; mzCd@<T,  
);T&pm:C>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) TMD\=8Na  
{ !rs }83w!  
 //{{AFX_DATA_INIT(CAboutDlg) ]cv/dY#  
 //}}AFX_DATA_INIT nrA 4N1  
} T+x / J]A  
W\($LD"X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Yecdw'BW?  
{ "Bv V89  
 CDialog::DoDataExchange(pDX); ,cxe"U  
 //{{AFX_DATA_MAP(CAboutDlg) P* i 'uN  
 //}}AFX_DATA_MAP <2oMk#Ng^  
} & kVa*O  
Qn|8Ic` *  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~Ad2L*5S  
 //{{AFX_MSG_MAP(CAboutDlg) !VaC=I^{  
 // No message handlers !4!qHJISa  
 //}}AFX_MSG_MAP mZXtHFMu  
END_MESSAGE_MAP() </Y(4Xwf=  
}t"K(oamm  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) g_n_Qlo  
: CDialog(CCaptureDlg::IDD, pParent) C~ A`h=A<  
{ ?hAO-*);  
 //{{AFX_DATA_INIT(CCaptureDlg) YcV^Fqi!  
  m_bControl = FALSE; w >%^pO~}`  
  m_bAlt = FALSE; BW6Ox=sr<  
  m_bShift = FALSE; ?(U;T!n  
  m_Path = _T("c:\\"); JU;`c>8=)  
  m_Number = _T("0 picture captured.");  3Z`"k2k  
  nCount=0; ]%I\FefT  
  bRegistered=FALSE; #?+[|RS|  
  bTray=FALSE; FZ}^)u}o  
 //}}AFX_DATA_INIT K2e68GU  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]'7Au]Us`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~ES%=if~Y  
} AbhR*  
{qlcTc  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }ng?Ar[  
{ T`pDjT  
 CDialog::DoDataExchange(pDX); `&.qHw)  
 //{{AFX_DATA_MAP(CCaptureDlg) ?-%(K^y4r  
  DDX_Control(pDX, IDC_KEY, m_Key); 3UmkFK<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `1n^~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Qd\='*:!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); cl1ygpf(  
  DDX_Text(pDX, IDC_PATH, m_Path); n_rpT .[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1_Ks*7vuq  
 //}}AFX_DATA_MAP PNd'21N  
} Aqmw#X  
O9-`e  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) aeI0;u  
//{{AFX_MSG_MAP(CCaptureDlg) \2=I//YF  
 ON_WM_SYSCOMMAND() m&b1H9ymd  
 ON_WM_PAINT() h_ccE 6]t  
 ON_WM_QUERYDRAGICON() A`JE(cIz3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2LR y/ah  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fVgN8b|&'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) oK-d58 sM  
//}}AFX_MSG_MAP u{va2n/  
END_MESSAGE_MAP() q]C_idK=  
8X.= 6M  
BOOL CCaptureDlg::OnInitDialog() XN6$TNsD$  
{ 1<Mb@t  
 CDialog::OnInitDialog(); < qab\M0W  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~4Gc~"  
 ASSERT(IDM_ABOUTBOX < 0xF000); jUKMDl H  
 CMenu* pSysMenu = GetSystemMenu(FALSE); '(C+qwdRv  
 if (pSysMenu != NULL) AX%}ip[PC  
 { ,52Lm=n  
  CString strAboutMenu; T n/Zs|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Cse`MP  
  if (!strAboutMenu.IsEmpty()) ?>{u@tYL  
  { lw gwdB  
   pSysMenu->AppendMenu(MF_SEPARATOR); E:M,nSc)53  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4eB oR%2o  
  } 6it [i@*"  
 } u?fM.=/N  
 SetIcon(m_hIcon, TRUE); // Set big icon Dq<DW2It>  
 SetIcon(m_hIcon, FALSE); // Set small icon v4Rci^8  
 m_Key.SetCurSel(0); aem gGw<  
 RegisterHotkey(); R`DzVBLl  
 CMenu* pMenu=GetSystemMenu(FALSE); kr~n5WiAZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); boCi*]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2A@oa9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *k_<|{>j(  
 return TRUE; // return TRUE unless you set the focus to a control WEX7=^k9  
} 8f[ztT0`g  
[ dVBsi  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) fCN+9!ljG`  
{ LxGD=b  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %XeN_ V  
 { Jnd_cJ]a  
  CAboutDlg dlgAbout; .tGz,z}  
  dlgAbout.DoModal(); vV$t`PEY  
 } LQr!0p.i"  
 else RCYv2=m>Q  
 { &y1iLk h^  
  CDialog::OnSysCommand(nID, lParam); 0&fO)de96  
 } yA"?Hv\o;  
} )D#}/3s  
eGg6wd  
void CCaptureDlg::OnPaint() T?f{.a)  
{ QD{1?aY  
 if (IsIconic()) 1goRO  
 { H[nBNz)C  
  CPaintDC dc(this); // device context for painting z9OpMA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w' J`$=  
  // Center icon in client rectangle &n_f.oUc  
  int cxIcon = GetSystemMetrics(SM_CXICON); Q|{b8K  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;92xSe"Ww  
  CRect rect; fap]`P~#L  
  GetClientRect(&rect); IAGY-+8e  
  int x = (rect.Width() - cxIcon + 1) / 2; mF~]P8  
  int y = (rect.Height() - cyIcon + 1) / 2; ]NBx5m+y@i  
  // Draw the icon B0gD4MX/  
  dc.DrawIcon(x, y, m_hIcon); *S.FM.r  
 } 8@LWg d  
 else x:~XZX\mwH  
 { Rvu5#_P  
  CDialog::OnPaint(); %Rf9 KQ  
 } 60{DR >S  
} cf$ hIB)Oi  
/3rNX}tOMH  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2jC:uk  
{ ogQfzk  
 return (HCURSOR) m_hIcon; Z}0xK6  
} gsEcvkj*  
LFxk.-{=  
void CCaptureDlg::OnCancel() +%,oq ]<[,  
{ F1_,V?  
 if(bTray) i.W*Go+  
  DeleteIcon(); gl`J(  
  CDialog::OnCancel(); o$;&q *  
} 3{~(_  
W/,:-R&'>  
void CCaptureDlg::OnAbout() <_t]?XHB[  
{ "&f|<g5  
 CAboutDlg dlg; W).Kq-  
 dlg.DoModal(); Gvdok<o  
} @ewi96  
X)iI]   
void CCaptureDlg::OnBrowse() #"!ga)a%L  
{ d7r!<u&/  
 CString str; gI2'[OU  
 BROWSEINFO bi; _<mY|  
 char name[MAX_PATH]; ?t6wozib2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {*hvzS{1d  
 bi.hwndOwner=GetSafeHwnd(); e~(e&4pb  
 bi.pszDisplayName=name; !idVF!xG  
 bi.lpszTitle="Select folder"; p.8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [kN_b<Pc,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8'zl\:@N  
 if(idl==NULL) O/Hj-u6&A  
  return; Ad-5Zn c5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ulW>8bW&  
 str.ReleaseBuffer(); H c>yZ:c;  
 m_Path=str; @|t]9  
 if(str.GetAt(str.GetLength()-1)!='\\') *tRsm"}  
  m_Path+="\\"; b+ycEs=_  
 UpdateData(FALSE); L"dN $ A  
} j} /).O  
`W+-0F@Y?@  
void CCaptureDlg::SaveBmp() {.e+?V2>_  
{ W/t,7lPFb  
 CDC dc; c u";rnj  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ut'T!RD  
 CBitmap bm; ,:J[|9  
 int Width=GetSystemMetrics(SM_CXSCREEN); #&r}J  
 int Height=GetSystemMetrics(SM_CYSCREEN); CP2wg .  
 bm.CreateCompatibleBitmap(&dc,Width,Height); r_Ou\|jU  
 CDC tdc; 4OJD_  
 tdc.CreateCompatibleDC(&dc); J!~kqNI  
 CBitmap*pOld=tdc.SelectObject(&bm); `^^t#sT   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2(~Zl\  
 tdc.SelectObject(pOld); $,/E"G`  
 BITMAP btm; N3\RXXY  
 bm.GetBitmap(&btm); 2p;I<C:Eo  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; H? z~V-8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2BF455e   
 BITMAPINFOHEADER bih; O>nMeU  
 bih.biBitCount=btm.bmBitsPixel;  *BM#fe  
 bih.biClrImportant=0; acke q#  
 bih.biClrUsed=0; 0nD?X+u  
 bih.biCompression=0; >\:GFD{z  
 bih.biHeight=btm.bmHeight; xq,ql@7  
 bih.biPlanes=1; rA?< \*  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]v>[r?X#V  
 bih.biSizeImage=size; 6qTMHRI  
 bih.biWidth=btm.bmWidth; 7R79[:uwJ  
 bih.biXPelsPerMeter=0; `'XN2-M8  
 bih.biYPelsPerMeter=0; {`M \}(E  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #*y.C[^5{  
 static int filecount=0; 7 qn=W  
 CString name; Z]DZ:dF  
 name.Format("pict%04d.bmp",filecount++); vuY X0&  
 name=m_Path+name; McS]aJfrk  
 BITMAPFILEHEADER bfh; ZD|F"v.  
 bfh.bfReserved1=bfh.bfReserved2=0; H$WD7/?j  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0n2H7}Uq  
 bfh.bfSize=54+size; Gukvd6-g9b  
 bfh.bfOffBits=54; Srmr`[i  
 CFile bf; C<T6l'S{?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LdOme [C1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *! :j$n;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jwLZC  
  bf.WriteHuge(lpData,size); d(RMD  
  bf.Close(); f2o6GC_  
  nCount++; Y7q Q` |  
 } lo6upir ZX  
 GlobalFreePtr(lpData); K2n#;fY %  
 if(nCount==1) DQ/rx`BG  
  m_Number.Format("%d picture captured.",nCount); u$5.GmKm  
 else 8Ara^Xh}q  
  m_Number.Format("%d pictures captured.",nCount); v9 /37AU  
  UpdateData(FALSE); .L%pWRxA[  
} ,38M6yD  
3$P  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }TZM@{;  
{ gk?H@b*  
 if(pMsg -> message == WM_KEYDOWN) 80g}<Lwc  
 { o(?9vU  
  if(pMsg -> wParam == VK_ESCAPE) 8mdVh\i!Kf  
   return TRUE; Ue Z(@6_:  
  if(pMsg -> wParam == VK_RETURN) }dMX1e1h8  
   return TRUE; r 20!   
 } 90iveb21}  
 return CDialog::PreTranslateMessage(pMsg); h~qvd--p0  
} (7! pc  
toD!RE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;3& wO~lW  
{ >}NnzZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N+ ]O#Js?  
  SaveBmp(); @Z#h?:  
  return FALSE; H$^9#{  
} #l-zY}&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D'ZUbAh!  
 CMenu pop; ZRw^< +  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kRwY#  
 CMenu*pMenu=pop.GetSubMenu(0);  %rlqq*  
 pMenu->SetDefaultItem(ID_EXITICON); SQU@JKi; g  
 CPoint pt; 1/ j >|  
 GetCursorPos(&pt); hMS:t(N{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); daSx^/$R  
 if(id==ID_EXITICON) e&ZH 1^O  
  DeleteIcon(); D(|+z-}M  
 else if(id==ID_EXIT) M3!;u%~} s  
  OnCancel(); W;!V_-:  
 return FALSE; ,+OVRc  
} D8E^[w!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nI(w7qhub  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~X<$ l+5  
 AddIcon(); Vx5fQ mx  
 return res; A/lznBHR  
} (Lj*FXmz  
#7:ah  
void CCaptureDlg::AddIcon() `{yI| Wf  
{ = 4|"<8'  
 NOTIFYICONDATA data; o,J8n;"l  
 data.cbSize=sizeof(NOTIFYICONDATA); d0%Wz5Np  
 CString tip; pV:44  
 tip.LoadString(IDS_ICONTIP); l$HBYA\Qh  
 data.hIcon=GetIcon(0); 1_9Ka V  
 data.hWnd=GetSafeHwnd(); N;}X$b5Y @  
 strcpy(data.szTip,tip); L9,GUtK{  
 data.uCallbackMessage=IDM_SHELL; u9c^YCBM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4wEkxCWp/  
 data.uID=98; @'hkU$N)  
 Shell_NotifyIcon(NIM_ADD,&data); vGJw/ij'X  
 ShowWindow(SW_HIDE); ;8e}X6YU  
 bTray=TRUE; ,|zwY~l t5  
} /Gb)BJk!  
t v`c" Pb  
void CCaptureDlg::DeleteIcon() {m,LpI0wG  
{ Aq'~'hS`1  
 NOTIFYICONDATA data; wJgGw5  
 data.cbSize=sizeof(NOTIFYICONDATA); # X{lV]Z  
 data.hWnd=GetSafeHwnd(); 3a U4Z|f~  
 data.uID=98; &!'R'{/?X  
 Shell_NotifyIcon(NIM_DELETE,&data); ,%V%g!6{  
 ShowWindow(SW_SHOW); _]3#C[1L  
 SetForegroundWindow(); C4-%|+Q i  
 ShowWindow(SW_SHOWNORMAL); :Us+u-~  
 bTray=FALSE; 1[a#blL6W  
} "18cD5-#  
JV !F<  
void CCaptureDlg::OnChange() w#L`|cYCm  
{ g~=- ,j|  
 RegisterHotkey(); wI F'|"  
} @qA11C.hq  
R"F:(  
BOOL CCaptureDlg::RegisterHotkey() UhU+vy6)/  
{ &RHx8zScP  
 UpdateData(); Yfz`or\@=  
 UCHAR mask=0; x;STt3M~  
 UCHAR key=0; c47.,oTo  
 if(m_bControl) \K Kt& bKL  
  mask|=4; ojIGfQV  
 if(m_bAlt) mD?={*7%  
  mask|=2; oHu7<r  
 if(m_bShift) [ 4PiQyr  
  mask|=1; ;_=dB[M  
  key=Key_Table[m_Key.GetCurSel()]; 4/2@^\?i)  
 if(bRegistered){ 3JF" O+@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mMK 93Ng"&  
  bRegistered=FALSE; ]qk`Yi  
 } s|:j~>53  
 cMask=mask; GgvMd~  
 cKey=key; i$!K{H1{9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a3 t||@v!  
 return bRegistered; J b7^'P  
}  y]ya.YG  
*44E'Dxv  
  四、小结 O%} hNTS"  
+\cG{n*  
  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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