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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: m~Lf^gbG?  
  =g{_^^n  
  一、实现方法 QT7w::ht  
sV9{4T~#|  
  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: g @c=Bt$  
&. |;yt%v  
#pragma data_seg("shareddata") HV]~=Bw2I  
HHOOK hHook =NULL; //钩子句柄 + TPbIRA  
UINT nHookCount =0; //挂接的程序数目 >WGX|"!"  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m]+X }|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ucIVVT(u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;g;,%jdCS  
static int KeyCount =0; 4<=eK7;XR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eukX#0/^  
#pragma data_seg() z6GL,wo#  
mafAC73  
  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。 {|8:U}<#h  
5Ws:Ei{R  
  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: 842Mydom  
n?TO!5RZK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;Xnk+  
cKey,UCHAR cMask) IqR[&T)lj  
{ O3sla bE#  
 BOOL bAdded=FALSE; xEd#~`Jmr  
 for(int index=0;index<MAX_KEY;index++){ mI{CM: :  
  if(hCallWnd[index]==0){ .#:@cP~v  
   hCallWnd[index]=hWnd; Zq2H9^![y~  
   HotKey[index]=cKey; g7E`;&f  
   HotKeyMask[index]=cMask; ONg<  
   bAdded=TRUE; >tE,8  
   KeyCount++; E-*>f"<h  
   break; *g/I&'^  
  } 1Ud t9$~T  
 } YyX^lL_  
 return bAdded; brp N >\  
} [A.eVuV;+  
//删除热键 UcKWa>:Fi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rm7*l<v6  
{ 'tq\<y  
 BOOL bRemoved=FALSE; g/n"N>L  
 for(int index=0;index<MAX_KEY;index++){ )[^:]}%r  
  if(hCallWnd[index]==hWnd){ 8ESkG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _BeX7  
    hCallWnd[index]=NULL; gn;nS{A  
    HotKey[index]=0; f"} 0j|Gg  
    HotKeyMask[index]=0; ;I0yQlx|U  
    bRemoved=TRUE; a8lo!e9q  
    KeyCount--; RN cI]oJ  
    break; N@%xLJF=N>  
   }  ^qSf  
  } Yp?a=R  
 } qqO10~Xc  
 return bRemoved; 9v5.4a}  
} x r+E  
A7I8Z6&  
5jj5 7j"  
  DLL中的钩子函数如下: %oSfL;W7  
j3V"d3)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D%5 {A=  
{ YA/H;707l  
 BOOL bProcessed=FALSE; W+-f `  
 if(HC_ACTION==nCode) mtHi9).,y|  
 { 0zq\ j  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =:0IHyB#0  
   switch(wParam) ej??j<]  
   {  G%W03c  
    case VK_MENU: CO6XIgTe  
     MaskBits&=~ALTBIT; zL[U;  
     break; @N:3`[oB  
    case VK_CONTROL: m8j#{[NE  
     MaskBits&=~CTRLBIT; :jN;l  
     break; G41$oalQ1  
    case VK_SHIFT: G1n>@Y'j''  
     MaskBits&=~SHIFTBIT; g'l7Jr3  
     break; })yb   
    default: //judge the key and send message .bY1N5=sz  
     break; +MZ2e^\F  
   } ]>]H:NEq  
   for(int index=0;index<MAX_KEY;index++){ ;Vtpq3  
    if(hCallWnd[index]==NULL) z<C~DH  
     continue; Vv* 5{_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rnt$BB[g  
    { OkO@BWL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2[bR6 T89  
     bProcessed=TRUE; hF{mm(qyv  
    } L 52z  
   } EzY scX.[  
  } fh5^Gd~  
  else if((lParam&0xc000ffff)==1){ //有键按下 v*T@ <]f3j  
   switch(wParam) ;tIIEc  
   { 0$dY;,Q.  
    case VK_MENU: ='l6&3X  
     MaskBits|=ALTBIT; E`Zh\u)  
     break; )="g?E3  
    case VK_CONTROL: gs2&0rnOy\  
     MaskBits|=CTRLBIT; h?O%XnD  
     break; }e;p8)]Wl  
    case VK_SHIFT: 9"l%tq_  
     MaskBits|=SHIFTBIT; 9i xnf=$Jp  
     break; Zq6ebj  
    default: //judge the key and send message @rDv (W  
     break; 4h2bk\z-  
   } N'1[t  
   for(int index=0;index<MAX_KEY;index++){ ,'@ISCK^  
    if(hCallWnd[index]==NULL) '\3.isTsx  
     continue; ,\">ovV33  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k? _$h<Y  
    { R|^t~h-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BtDgv.;GH  
     bProcessed=TRUE; ohG43&g~  
    } zJym`NF  
   } v+, w{~7RH  
  } A_dYN?^?|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {~ vPq  
   for(int index=0;index<MAX_KEY;index++){ z8MpE  
    if(hCallWnd[index]==NULL) -ZMl[;OM  
     continue; @x\gk5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (4/`@;[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P24    
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [+5SEr}  
   } k@X As  
  } [O =)FiY-  
 } Ql!6I(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yyYbB]D  
} s</ktPtu  
iS^^Z ZyR  
  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: (5\d[||9g  
1 bx^Pt)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dXr !_)i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MDXQj5s^  
` G/QJH{I  
  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: Vf* B1Zb  
]4pC\0c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y K62#;  
{ [;\< 2=H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r4qV}-E  
 { UM;bVf?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 D_`)T;<Sp  
  SaveBmp(); w+ )GM  
  return FALSE; [}B{e=`!  
 } {`SGB;ho  
 …… //其它处理及默认处理 z j0pP{y  
} ?>Ci`XlLr  
w2_I/s6B  
>5Rw~  
  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。 Bk(XJAjY  
dXy"yQ>{  
  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。 &ppZRdq]  
Vam8NnZ|r  
  二、编程步骤 0Nzv@g{3  
oML K!]a  
  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"; D}C*8s bC}  
C'#)bX{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6j.(l4}  
MkIO0&0O  
  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; C3 c|@7FU  
h3 ZL0Fi*  
  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?X,Y\Lp  
[}Yci:P_ +  
  5、 添加代码,编译运行程序。 5Ddyb%  
`Y9}5p  
三、程序代码 Y@xeyMzE  
)qQg n]  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1+[|pXT}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3B]+]e~  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Bc` A]U  
#if _MSC_VER > 1000 <i @jD  
#pragma once \%Ih 6  
#endif // _MSC_VER > 1000 {ca^yHgGy  
#ifndef __AFXWIN_H__ `e:RZ  
#error include 'stdafx.h' before including this file for PCH x6mq['_  
#endif g0 U\AN  
#include "resource.h" // main symbols X_yU"U  
class CHookApp : public CWinApp N>#P 1!eP  
{ iV$75Atk  
 public: Cl){sP=8W  
  CHookApp(); E<[ bgL  
  // Overrides Hm[!R:HW,S  
  // ClassWizard generated virtual function overrides 3^Q U4  
  //{{AFX_VIRTUAL(CHookApp) 1T^L) %&p_  
 public: " ~hjB  
  virtual BOOL InitInstance(); H s 3*OhK\  
  virtual int ExitInstance(); "!eT  
  //}}AFX_VIRTUAL v[=E f  
  //{{AFX_MSG(CHookApp) U-N/Z\QD  
  // NOTE - the ClassWizard will add and remove member functions here. Q ?<9  
  // DO NOT EDIT what you see in these blocks of generated code ! !q1^X% a  
  //}}AFX_MSG fu;B?mIn  
  DECLARE_MESSAGE_MAP() QE6-(/  
}; --hnv/AjI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?a_q!,8:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DFH6.0UW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (9lx5  
BOOL InitHotkey(); WM7/|.HQ  
BOOL UnInit(); Z1}zf( JU  
#endif ooxzM `  
_^A NJ7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. YR`rg;n#  
#include "stdafx.h" F#R\Ot,hv  
#include "hook.h"  K8we*  
#include <windowsx.h> soCHwiE  
#ifdef _DEBUG =5#Jsn?U  
#define new DEBUG_NEW  ~&jCz4M  
#undef THIS_FILE -v2q:x'G#  
static char THIS_FILE[] = __FILE__; ZOsn,nF  
#endif ml/O  
#define MAX_KEY 100 J<O_N~$$*  
#define CTRLBIT 0x04 s$G8`$+i1  
#define ALTBIT 0x02 OlFn<:V K  
#define SHIFTBIT 0x01 jv^ L~<u  
#pragma data_seg("shareddata") .DsYR/  
HHOOK hHook =NULL; ^aMdbB  
UINT nHookCount =0; ~n\ea:.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -L3RzX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^@> Qiy  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +Ea X S  
static int KeyCount =0; H2KY$;X [  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2$UR " P  
#pragma data_seg() q{(&:~M  
HINSTANCE hins; !Z)^c&  
void VerifyWindow(); b DvbM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) eF\C?4  
//{{AFX_MSG_MAP(CHookApp) J4X35H=Z  
// NOTE - the ClassWizard will add and remove mapping macros here. jzw?V9Ijb  
// DO NOT EDIT what you see in these blocks of generated code! \mG M#E  
//}}AFX_MSG_MAP Ji=iq=S7  
END_MESSAGE_MAP() r $2   
AXI:h"so  
CHookApp::CHookApp() J8'zvH&I  
{ xb;m m9H  
 // TODO: add construction code here, f ebh1rUX  
 // Place all significant initialization in InitInstance fe/6JV  
} e8v=n@0  
p$ <qT^]&  
CHookApp theApp; a06q-3zw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %tLq&tyeY  
{ P ie!Su`  
 BOOL bProcessed=FALSE; |0mI3r  
 if(HC_ACTION==nCode) _J!mhU A  
 { (iP,YKG1?  
  if((lParam&0xc0000000)==0xc0000000){// Key up _ RYZyw   
   switch(wParam) K@lV P!z  
   { JR)rp3o-  
    case VK_MENU: %W+ F e,]  
     MaskBits&=~ALTBIT; CB1u_E_  
     break; 9m!fW|4  
    case VK_CONTROL: B/}>UHM  
     MaskBits&=~CTRLBIT; 9\2&6H  
     break; JH#?}L/0Fe  
    case VK_SHIFT: !}7m^  
     MaskBits&=~SHIFTBIT; lY`<-`{I_  
     break; j+/*NM_y3  
    default: //judge the key and send message b<7f:drVC  
     break; ]42 l:at  
   } +3CMfYsr8  
   for(int index=0;index<MAX_KEY;index++){ 7 >(ygu  
    if(hCallWnd[index]==NULL) RdHR[Usm  
     continue; `Mg "!n`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eo[^ij  
    { 7m:,-xp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i/z7a%$   
     bProcessed=TRUE; ],|B4\b;  
    } ^e ii 4  
   }  j C?  
  } (0S7  
  else if((lParam&0xc000ffff)==1){ //Key down rJ>8|K[kt  
   switch(wParam) f6)H!SI  
   { nc)`ISI  
    case VK_MENU: K%;yFEZ  
     MaskBits|=ALTBIT; ~O6=dR  
     break; Is[0ri   
    case VK_CONTROL: ":ycyN@g  
     MaskBits|=CTRLBIT; 79_MP  
     break; Viw3 /K  
    case VK_SHIFT: =KLYR UW  
     MaskBits|=SHIFTBIT; QZol( 2~Y  
     break; D.?gV_  
    default: //judge the key and send message '-=?lyKv  
     break; I4'j_X t  
   } /Z_QCj  
   for(int index=0;index<MAX_KEY;index++) 75f.^4/%  
   { "?SnA +)  
    if(hCallWnd[index]==NULL) v},sWjv  
     continue; ZtDpCl_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ :.p8`  
    { D5x^O2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,PY e7c  
     bProcessed=TRUE; g:yK/1@Hk}  
    } 9 pn1d.  
   } It[~0?+  
  } &PX'=UT  
  if(!bProcessed){ 0'uj*Y{L  
   for(int index=0;index<MAX_KEY;index++){ hkG<I';M?M  
    if(hCallWnd[index]==NULL) 0ZN/-2c A#  
     continue; mf#oa~_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WyP1"e^ 9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZUycJ-[  
   } [aC(Ga}  
  } }- Sr@bE  
 } {;U:0BPI3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nsq%b?#  
} =[kv@ p  
UuGv= yC^6  
BOOL InitHotkey() ^&Bye?`5  
{ uY,FugWbl  
 if(hHook!=NULL){ x/~M=][tN  
  nHookCount++; 3-'|hb  
  return TRUE; gK /K Z8  
 } 4)_ [)MZ\j  
 else OuoZd!"qf  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $)3/N&GXR  
  if(hHook!=NULL) {+;8dtZ)x  
   nHookCount++; l}x{.q7U l  
  return (hHook!=NULL); ZfU_4Pl->  
} @u^Ib33  
BOOL UnInit() 43Q&<r$[T  
{ <9"i_d%  
 if(nHookCount>1){ CJ_B.  
  nHookCount--; Z5Cv$bUc  
  return TRUE; W3b\LnUa  
 } ~X/T6(n$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [>E0(S]  
 if(unhooked==TRUE){ `*]r.u0  
  nHookCount=0; _~!,x.Dbp  
  hHook=NULL; 7Do)++t  
 } \MU4"sXw  
 return unhooked; PA E)3  
} L<: ya  
dx^3(#B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yAOC<d9 E  
{ [ LCi,  
 BOOL bAdded=FALSE; m<E7cY3mX  
 for(int index=0;index<MAX_KEY;index++){ ]#nAld1cmy  
  if(hCallWnd[index]==0){ <FP -]R)  
   hCallWnd[index]=hWnd; Xp' KQ1w)  
   HotKey[index]=cKey; a <3oyY'  
   HotKeyMask[index]=cMask; ^P[*yf  
   bAdded=TRUE; UxW~yk  
   KeyCount++; m#Cp.|>kP4  
   break; &7 ,wdG  
  } U+KbvkX wj  
 } #r1x0s40D  
 return bAdded;  m ]\L1&  
} *)`:Nm~y  
E^g6,Y:i9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;BqX=X+#  
{ 1||e !W  
 BOOL bRemoved=FALSE; zVIzrz0  
 for(int index=0;index<MAX_KEY;index++){ ?F-,4Ox{/  
  if(hCallWnd[index]==hWnd){ <,m}TTq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J(Bn  n  
    hCallWnd[index]=NULL; |A2.W8`o  
    HotKey[index]=0; \ .:CL?m#  
    HotKeyMask[index]=0; t[<=QK  
    bRemoved=TRUE; >@t]M`#&h  
    KeyCount--; vOqT Ld  
    break; xe5>)\18-  
   } eA!aUu  
  } 9`xq3EL2T  
 } 2]@U$E='s  
 return bRemoved; rTi.k  
} 4EOu)#  
B$\5=[U  
void VerifyWindow() (vQShe\  
{ DU;]Q:r{  
 for(int i=0;i<MAX_KEY;i++){ @gZ%>qe  
  if(hCallWnd!=NULL){ b&LhydaJ  
   if(!IsWindow(hCallWnd)){ ;G w5gK^  
    hCallWnd=NULL; YXmLd'F^3  
    HotKey=0; f`?|A  
    HotKeyMask=0; U8moVj8w1  
    KeyCount--; dZZHk  
   } &B))3WFy  
  } UPbG_ #"wZ  
 } 2+|[e_  
} ~WVrtYJu  
m^TkFt<BM  
BOOL CHookApp::InitInstance() ;$W|FpR2  
{ +ux,cx.U"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n |(Y?`(  
 hins=AfxGetInstanceHandle(); 7Q^t(  
 InitHotkey(); vZ*5 93C8  
 return CWinApp::InitInstance(); -q-%)f  
} L:~ "Vw6]_  
M,l Ib9  
int CHookApp::ExitInstance() NWTsL OIm  
{ #KiRH* giU  
 VerifyWindow(); ^fRA$t  
 UnInit(); AR&u9Y)I  
 return CWinApp::ExitInstance(); ^.k}YSWut  
} S:Hg =|R  
9X!OQxmg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J H6\;G6  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P,,@&* :  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d=q2Or   
#if _MSC_VER > 1000 uHy^ Bq  
#pragma once !W8$-iq  
#endif // _MSC_VER > 1000 dD#A.C,Rz  
S]k<Ixvf  
class CCaptureDlg : public CDialog ETYw  
{ O%rjY  
 // Construction htIV`_<Ro  
 public: Cfa?LgSz  
  BOOL bTray; KpSHf9!&[  
  BOOL bRegistered; Y@Ty_j~  
  BOOL RegisterHotkey(); [7$.)}Q-  
  UCHAR cKey; \vKMNk;kz  
  UCHAR cMask; =T9QmEBm  
  void DeleteIcon(); $LKniK  
  void AddIcon(); i/~A7\:8%  
  UINT nCount; x#'# ~EO-G  
  void SaveBmp();  /I="+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M,NYF`;a  
  // Dialog Data xqIt?v2c  
  //{{AFX_DATA(CCaptureDlg)  $ l Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; a:1-n %&F  
  CComboBox m_Key; j:rGFd  
  BOOL m_bControl; $ -;,O8yR  
  BOOL m_bAlt; 5r@x$*>e  
  BOOL m_bShift; "(/.3`g  
  CString m_Path; )| 3?7?X  
  CString m_Number; mL ]zkD_  
  //}}AFX_DATA Fj|C+;Q.  
  // ClassWizard generated virtual function overrides 5_{C \S`T  
  //{{AFX_VIRTUAL(CCaptureDlg) EZao\,t  
 public: .#P'NF(5#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *uNa( yd  
 protected: S$ dFz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q!MS_ #O  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8IbHDDS  
  //}}AFX_VIRTUAL gTm[<Y  
  // Implementation a3JG&6-  
 protected: !fjDO!,!  
  HICON m_hIcon; Kh}#At^C8e  
  // Generated message map functions 5^*I]5t8  
  //{{AFX_MSG(CCaptureDlg) Y@F@k(lOo  
  virtual BOOL OnInitDialog(); mZ'`XAS~;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *RivZ c9;P  
  afx_msg void OnPaint(); (;V6L{Rf>  
  afx_msg HCURSOR OnQueryDragIcon(); BA53   
  virtual void OnCancel(); |I6\_K.=L  
  afx_msg void OnAbout(); WM~@/J  
  afx_msg void OnBrowse(); /{^Qup  
  afx_msg void OnChange(); WL+I)n8~  
 //}}AFX_MSG pvD\E  
 DECLARE_MESSAGE_MAP() SVo:%mX  
}; U)o(}:5xF  
#endif ?x=;?7  
"}Vow^vb  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >d&B:  
#include "stdafx.h" N!{('po  
#include "Capture.h" 8:TN,p  
#include "CaptureDlg.h" D `c YQ-  
#include <windowsx.h> k9xfv@v}  
#pragma comment(lib,"hook.lib") Wyd,7]'z)Z  
#ifdef _DEBUG :iP2e+j  
#define new DEBUG_NEW 'WUd7  
#undef THIS_FILE Q!iM7C!8  
static char THIS_FILE[] = __FILE__; iG^o@*}a  
#endif O'*KNJX  
#define IDM_SHELL WM_USER+1 e3}`]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V*"-@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :'|%~&J  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F$F,I,$ "  
class CAboutDlg : public CDialog k|'{$/ n  
{ ~*@ UQ9*p#  
 public: >/9f>d?w^  
  CAboutDlg(); !8(: G6Ne  
  // Dialog Data 9{]U6A*K0w  
  //{{AFX_DATA(CAboutDlg) vlY83mU.  
  enum { IDD = IDD_ABOUTBOX }; 8XIG<Nc  
  //}}AFX_DATA &Rdg07e;>  
  // ClassWizard generated virtual function overrides bj=kqO;*O  
  //{{AFX_VIRTUAL(CAboutDlg) <k+dJ=f  
 protected: KLrxlD4\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^"STM'Zh  
  //}}AFX_VIRTUAL ZF!cXo7d  
  // Implementation w9Bbvr6  
 protected: Bf1,(^3XH  
  //{{AFX_MSG(CAboutDlg) % \IB_M  
  //}}AFX_MSG 4}E|CD/pZ  
  DECLARE_MESSAGE_MAP() <F{EZ Ii  
}; @ (<C{  
^{lcj  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ii FeO  
{ PUZH[-:c  
 //{{AFX_DATA_INIT(CAboutDlg) NitsUg@<  
 //}}AFX_DATA_INIT 3|x*lmit  
} :[YHJaK  
LX2rg\a+%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) P|%uB'|H  
{ <[Oe.0SGu  
 CDialog::DoDataExchange(pDX); ia6%>^  
 //{{AFX_DATA_MAP(CAboutDlg) R~ n[g  
 //}}AFX_DATA_MAP P'MfuTtT&  
} )_BQ@5NK  
(?4m0Sn>#h  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .5*5S[  
 //{{AFX_MSG_MAP(CAboutDlg) pY]T3 2  
 // No message handlers 9K,PT.c  
 //}}AFX_MSG_MAP kCRfO}wt3  
END_MESSAGE_MAP() (d mLEt  
?gD^K,A Hd  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c_wvuKa  
: CDialog(CCaptureDlg::IDD, pParent) o{MF'B #  
{ [QwEidX|  
 //{{AFX_DATA_INIT(CCaptureDlg) q(xr5iuP_  
  m_bControl = FALSE; AUjZYp  
  m_bAlt = FALSE; a4aM.o  
  m_bShift = FALSE; Wg{ 9X#|  
  m_Path = _T("c:\\"); In13crr4!  
  m_Number = _T("0 picture captured."); x# MMrV&M  
  nCount=0; 0])D)%B k  
  bRegistered=FALSE; I8};t b#  
  bTray=FALSE; uIh68UM  
 //}}AFX_DATA_INIT b$FK}D5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F/p/&9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -@bOFClE  
} s R/z)U_  
V9`?s0nn^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ./5LV)_`  
{ hNU$a?eVpR  
 CDialog::DoDataExchange(pDX); D]tI's1  
 //{{AFX_DATA_MAP(CCaptureDlg) Z:eB9R#2y  
  DDX_Control(pDX, IDC_KEY, m_Key); |xYr0C[Pq  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 'aV])(Wm>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *'&]DJj  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "xWrYq'"  
  DDX_Text(pDX, IDC_PATH, m_Path); !U::kr=t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); y[`>,?ns5  
 //}}AFX_DATA_MAP _\&v A5-  
} Mbm'cM&}  
!#&`1cYX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) t?Ku6Z'  
//{{AFX_MSG_MAP(CCaptureDlg) Dxvizd>VU  
 ON_WM_SYSCOMMAND() 1FA:"0lO  
 ON_WM_PAINT() KpX1GrIn3  
 ON_WM_QUERYDRAGICON() s#cb wDT  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ==#mlpi`S[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u~c75Mk_v  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P*6h $T  
//}}AFX_MSG_MAP VEsIhjQ  
END_MESSAGE_MAP() 6+ UTEw;  
^=Dz)95c  
BOOL CCaptureDlg::OnInitDialog() NJ^Bv`  
{ _w}l,   
 CDialog::OnInitDialog(); WU$l@:Yo  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); v_|k:l  
 ASSERT(IDM_ABOUTBOX < 0xF000); H~$*R7~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ,tTq25~H\  
 if (pSysMenu != NULL) Efp[K}Z^$  
 { q!;u4J  
  CString strAboutMenu; )&6ZgRq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0ZM#..3sI  
  if (!strAboutMenu.IsEmpty()) !P8Y(i  
  { "%I<yUP]U  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]A&pX AM  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k'8tqIUN]  
  } F5y0(=$T  
 } @#r6->%W  
 SetIcon(m_hIcon, TRUE); // Set big icon F,8?du]  
 SetIcon(m_hIcon, FALSE); // Set small icon rSa=NpFxLu  
 m_Key.SetCurSel(0); FW"n+7T  
 RegisterHotkey(); Nn#;Kjul.  
 CMenu* pMenu=GetSystemMenu(FALSE); <EKTFHJ!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U3**x5F_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4^Ke? ;v  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); C;3  
 return TRUE; // return TRUE unless you set the focus to a control mWUkkR(/  
} prEI9/d"  
;,lFocGv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y{d-k1?s5  
{ J ?0P{{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tdsfCvF= a  
 { ?zuKVi? I  
  CAboutDlg dlgAbout; sTS/ ]"l  
  dlgAbout.DoModal(); D_q"|D$SB  
 } }Y"vUl_I2  
 else G\z5Ue*  
 { 8kLHQ0pmu  
  CDialog::OnSysCommand(nID, lParam); QXu[<V  
 } !$NQF/Ol  
} |b4f3n  
Skg}/Ek  
void CCaptureDlg::OnPaint() +!Q*ie+q  
{ _vJ(F  
 if (IsIconic()) <2af&-EG s  
 { 7NvnCs  
  CPaintDC dc(this); // device context for painting MWv(/_b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dY{qdQQ}  
  // Center icon in client rectangle 8 =oUE$9  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0qq>(K[  
  int cyIcon = GetSystemMetrics(SM_CYICON); Z aYUf  
  CRect rect; 704_ehrlE  
  GetClientRect(&rect); F%f)oq`B  
  int x = (rect.Width() - cxIcon + 1) / 2; _lDNYpv  
  int y = (rect.Height() - cyIcon + 1) / 2; |%oI,d=ycv  
  // Draw the icon :6:,s#av  
  dc.DrawIcon(x, y, m_hIcon); eI9#JM|2  
 } Q?V+ 0J  
 else */HW]x|?V~  
 { |~o0 -: 'C  
  CDialog::OnPaint(); I!#WXK  
 } 8VtRRtl  
} |>RNIJ]  
Jot7 L%,TB  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6p9 { z42  
{ M._;3_)%/  
 return (HCURSOR) m_hIcon; ]O>AD 6P  
} u9m ~1\R*  
iR"6VO  
void CCaptureDlg::OnCancel() ;X;(7  
{ @\r2%M-  
 if(bTray) F`La_]f?b\  
  DeleteIcon(); Z,tHyyF?j  
  CDialog::OnCancel(); "ql$Rz8  
} OdpHF~(Y/  
^T*!~K8A  
void CCaptureDlg::OnAbout() aL*}@|JL"  
{ xI_0`@do  
 CAboutDlg dlg; 0NK|3]p  
 dlg.DoModal(); *07?U")  
} )HcLpoEi  
{+]tx46$  
void CCaptureDlg::OnBrowse() W^7yh&@lU  
{ jgiS/oW  
 CString str; \a4X},h\  
 BROWSEINFO bi; b0/YX@  
 char name[MAX_PATH]; AB{zkEuK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +cbF$,M4  
 bi.hwndOwner=GetSafeHwnd(); .C.b5x!  
 bi.pszDisplayName=name; _K&Hiz/'  
 bi.lpszTitle="Select folder"; .4ZOm'ko{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )~Gn7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); h@z0 x4_])  
 if(idl==NULL) %LM6=nt  
  return; L?Ys(a"k  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~MP |L?my  
 str.ReleaseBuffer(); ;%Px~g  
 m_Path=str; NG`Y{QT6N  
 if(str.GetAt(str.GetLength()-1)!='\\') K$:+]fJK  
  m_Path+="\\"; ^i r)z@P?V  
 UpdateData(FALSE); O c.fvP^ZD  
} N~0ih T G5  
za+)2/ `L  
void CCaptureDlg::SaveBmp() G[*z,2Kb>  
{ 7l ,f  
 CDC dc; V;W{pd-I  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %NfXe[T  
 CBitmap bm; *VmX.  
 int Width=GetSystemMetrics(SM_CXSCREEN);  +hKs  
 int Height=GetSystemMetrics(SM_CYSCREEN); `!spi=f  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =av0a !  
 CDC tdc; Dw.I<fns^B  
 tdc.CreateCompatibleDC(&dc); as'yYn8  
 CBitmap*pOld=tdc.SelectObject(&bm); rW090Py  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [?hvx}  
 tdc.SelectObject(pOld); [Y~~C J  
 BITMAP btm; MN8>I=p  
 bm.GetBitmap(&btm); &CcW(-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]Y-Y.&b7t  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |N^"?bSt  
 BITMAPINFOHEADER bih; _n/73Oh  
 bih.biBitCount=btm.bmBitsPixel; C\joDAD  
 bih.biClrImportant=0; g ?xD*3 <  
 bih.biClrUsed=0; 4U_+NC>b  
 bih.biCompression=0; 73]8NVm  
 bih.biHeight=btm.bmHeight; F+GX{e7E\  
 bih.biPlanes=1; /G|v.#2/g  
 bih.biSize=sizeof(BITMAPINFOHEADER); yXoNfsv  
 bih.biSizeImage=size; FZW`ADq]  
 bih.biWidth=btm.bmWidth; VdGVEDwz  
 bih.biXPelsPerMeter=0; K a& 2>F  
 bih.biYPelsPerMeter=0; PO8Z2"WI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z#B}#*<C  
 static int filecount=0; {%CW!Rc  
 CString name; |d&C<O;f  
 name.Format("pict%04d.bmp",filecount++);  ,vO\n^  
 name=m_Path+name; 7#d:TXS  
 BITMAPFILEHEADER bfh; wJ pb$;  
 bfh.bfReserved1=bfh.bfReserved2=0; /a<UKh:A[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U<Tv<7`  
 bfh.bfSize=54+size; [*Ai@:F  
 bfh.bfOffBits=54; ?AD- n6  
 CFile bf; 0j;ZPqEf3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %8 D>aS U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g1|Py t{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); t0jE\6r  
  bf.WriteHuge(lpData,size); N mXRA(m  
  bf.Close(); &A*E)T#>#  
  nCount++; %\(-<aT  
 } |(ab0b #  
 GlobalFreePtr(lpData); qJ(uak  
 if(nCount==1) K#N9N@WjR  
  m_Number.Format("%d picture captured.",nCount); Q(cLi:)X2  
 else rAAx]nQ@  
  m_Number.Format("%d pictures captured.",nCount); deArH5&!  
  UpdateData(FALSE); ;l~a|KW0  
} {hJCn*m_   
K!Fem6R  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s+v9H10R  
{ /&Cq-W  
 if(pMsg -> message == WM_KEYDOWN) Sh1$AGm  
 { $ZGup"z)  
  if(pMsg -> wParam == VK_ESCAPE) B1J,4  
   return TRUE; yf0v,]v[  
  if(pMsg -> wParam == VK_RETURN) pi~5}bF!a  
   return TRUE; 05k'TqT{c  
 } BO4;S/ O  
 return CDialog::PreTranslateMessage(pMsg); S6(48/  
} 'G~i;o  2  
-3mIdZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v@OELJX  
{ 7Y[ q)lv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]W$G!(3A  
  SaveBmp(); D4@?>ek6U  
  return FALSE; rh1PpsSc  
} Qw5(5W[L  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \1gAWUt('  
 CMenu pop; hHTt-x#  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); i9zh X1#  
 CMenu*pMenu=pop.GetSubMenu(0); E b:iym0  
 pMenu->SetDefaultItem(ID_EXITICON); i+mU(/l2{  
 CPoint pt; |9%~z0  
 GetCursorPos(&pt); c5$DHT @N"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (J%4}Dm  
 if(id==ID_EXITICON) ] 1pIIX}  
  DeleteIcon(); V\x'w*FP  
 else if(id==ID_EXIT) 1t^y?<)  
  OnCancel(); ?k4Hk$V  
 return FALSE; dp^PiyL  
} gJr)z7W'8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )W 5g-@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t`E5bWG  
 AddIcon(); }a[]I%bu 2  
 return res; XWAIW= .  
} Ewp2 1  
$3l#eKZA  
void CCaptureDlg::AddIcon() .z_nW1id  
{ {Kr}RR*{X  
 NOTIFYICONDATA data; U5N|2  
 data.cbSize=sizeof(NOTIFYICONDATA); :AFW=e@<  
 CString tip; k^8;3#xG  
 tip.LoadString(IDS_ICONTIP); C_/eNu\I  
 data.hIcon=GetIcon(0); r<1W.xd":  
 data.hWnd=GetSafeHwnd(); #*.4Jv<R  
 strcpy(data.szTip,tip); ]:D&kTc  
 data.uCallbackMessage=IDM_SHELL; FS&QF@dtgf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1aO(+](;  
 data.uID=98; MbCz*oW  
 Shell_NotifyIcon(NIM_ADD,&data); *Vq'%b9  
 ShowWindow(SW_HIDE); ]Ss63Vd  
 bTray=TRUE; g2TK(S|#  
} r3U7`P   
>^`#%$+  
void CCaptureDlg::DeleteIcon() !PGCoI  
{ { CR`~)v&  
 NOTIFYICONDATA data; ,"`3N2!Y}  
 data.cbSize=sizeof(NOTIFYICONDATA); \mGb|aF8  
 data.hWnd=GetSafeHwnd();  *\xRNgEQ  
 data.uID=98; ]~dB| WB  
 Shell_NotifyIcon(NIM_DELETE,&data); ,&4 [`d  
 ShowWindow(SW_SHOW); 8 A]8yX =  
 SetForegroundWindow(); ";(m,i f-  
 ShowWindow(SW_SHOWNORMAL); qXq#A&  
 bTray=FALSE; nbP}a?XC  
} :KvZP:T  
&$CyT6mb^  
void CCaptureDlg::OnChange() V.u^;gr3  
{ vb0Ca+}}  
 RegisterHotkey(); nRqP_*]  
} rwUhNth-Qh  
^0>^5l'n  
BOOL CCaptureDlg::RegisterHotkey() j -o  
{ KYB3n85 1  
 UpdateData(); ,?j!c*  
 UCHAR mask=0; k7*-v/ *S  
 UCHAR key=0; B^dMYFelJ  
 if(m_bControl) xC _3&.  
  mask|=4; N)E'k%?,  
 if(m_bAlt) W%ix|R^2]  
  mask|=2; g~K-'Nw  
 if(m_bShift) bt=D<YZk  
  mask|=1; 8M!9gvcaO  
  key=Key_Table[m_Key.GetCurSel()]; M^ WoV }'  
 if(bRegistered){ |n,O!29  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9<CUm"%J  
  bRegistered=FALSE; '!Va9m*w7  
 } B &Z0ZWx  
 cMask=mask; =r]_$r%gR  
 cKey=key; oSMIWwg7G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F'{T[MA  
 return bRegistered; #oEtLb@O  
} b4$.uLY  
!?i9fYu  
  四、小结 502(CO>  
mXJG &EA  
  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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