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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: @KJmNM1]V  
  @Ph'!  
  一、实现方法 s"~,Zzy@j  
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  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: u,~+ho@  
^ '_Fd  
#pragma data_seg("shareddata") a(uQGyr[k1  
HHOOK hHook =NULL; //钩子句柄 ?OGs+G  
UINT nHookCount =0; //挂接的程序数目 IvI;Q0E-3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Z/:W.*u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?.ofs}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;zSV~G6-  
static int KeyCount =0;  < B!f;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )iZhE"?z  
#pragma data_seg() zLPCWP.u  
)i:"cyoE  
  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。 yr)e."#S  
ZIc-^&`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: g^U-^ f  
a, `B.I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR RK_z!%(P  
cKey,UCHAR cMask) -$kbj*b##  
{ 9h<iw\ $'  
 BOOL bAdded=FALSE; iztgk/(+G  
 for(int index=0;index<MAX_KEY;index++){ !Wy&+H*0  
  if(hCallWnd[index]==0){ >n1UK5QD  
   hCallWnd[index]=hWnd; |=W>4>  
   HotKey[index]=cKey; [P]M)vJ**  
   HotKeyMask[index]=cMask; Q[lkhx|.B  
   bAdded=TRUE; &m{~4]qWpM  
   KeyCount++; #XNURj  
   break; "*KOU2}C  
  } kn WI7  
 } d8WEsQ+)A  
 return bAdded; & fnfuU$   
} RG/P]  
//删除热键 Z7Nhb{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <!X]$kvG  
{ V3axwg_  
 BOOL bRemoved=FALSE; (D+%*ax  
 for(int index=0;index<MAX_KEY;index++){ Rb <{o8  
  if(hCallWnd[index]==hWnd){ dhuIVBp!!e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uuy0fQQ8ti  
    hCallWnd[index]=NULL; - @KT#  
    HotKey[index]=0; j92+kq>Xd  
    HotKeyMask[index]=0; 3>^B%qg6  
    bRemoved=TRUE; {s?hXB  
    KeyCount--; avqJ[R  
    break; Xg}~\|n  
   } @d|]BqQ4jh  
  } !DKl:8mx4  
 } Y1BxRd?D  
 return bRemoved; fi6_yFl  
} z7a @'+'  
w_Z*X5u  
s ZokiFJ  
  DLL中的钩子函数如下: -Q1~lN m:  
b+BX >$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0%3T'N%  
{ WhV>]B2+"  
 BOOL bProcessed=FALSE; :5:_Dr<  
 if(HC_ACTION==nCode) w aDJ  
 { l_2YPon  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h5))D!  
   switch(wParam) +:z%#D  
   {  y|WOw(#  
    case VK_MENU: CS"p3$7,  
     MaskBits&=~ALTBIT; P?y{ 9H*  
     break; S_Vquw(+  
    case VK_CONTROL: eh3CVgH91;  
     MaskBits&=~CTRLBIT; 11JO[  
     break; o7g6*hJz  
    case VK_SHIFT: ?\a';@h  
     MaskBits&=~SHIFTBIT; ,Ne v7X[0  
     break; {1GIiP-U  
    default: //judge the key and send message "~IGE3{  
     break; nm<S#i*  
   } RY*s}f  
   for(int index=0;index<MAX_KEY;index++){ ;fv/s]X86I  
    if(hCallWnd[index]==NULL) =}W)%Hldr.  
     continue; ralU9MN.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hPUYq7B  
    { \0l"9 B.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3<6P^p=I  
     bProcessed=TRUE; (' i_Xe  
    } 79U 7<]-!  
   } d.NB@[?*  
  } 8SMa5a{  
  else if((lParam&0xc000ffff)==1){ //有键按下 oc&yz>%q  
   switch(wParam) @wXo{p@W  
   { 6r)qM)97  
    case VK_MENU: om,=.,|Ld  
     MaskBits|=ALTBIT; R=HcSRTkA  
     break; vu)V:y  
    case VK_CONTROL: DFqVZ   
     MaskBits|=CTRLBIT; nZUBblRJ)  
     break; >@^j9{\  
    case VK_SHIFT: )W![TIp  
     MaskBits|=SHIFTBIT; .fS1  
     break; Lmyw[s\U  
    default: //judge the key and send message 1 BVpv7@  
     break; ;#?+i`9'q  
   } f@IL2DL}\  
   for(int index=0;index<MAX_KEY;index++){ GSg/I.)S  
    if(hCallWnd[index]==NULL) N~ M-|^L  
     continue; VW9BQs2w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LtBm }0  
    { f.u[!T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I*8_5?)g<  
     bProcessed=TRUE; a~[]Ye@H  
    } 26c1Yl,DMn  
   } C8 2lT_7"  
  } [Uu!:SZ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 *:V"C\`^n  
   for(int index=0;index<MAX_KEY;index++){ aAkO>X%[  
    if(hCallWnd[index]==NULL) 1He'\/#  
     continue; RIxGwMi%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @Tf5YZ*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XZ&q5]PJI  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 zDof e*  
   } _{'HY+M  
  } G(y@Tor+  
 } xBMhk9b^0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); las|ougLy  
} dD"o~iEC  
(g]J hG  
  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: uEkUK|  
gkNvvuQXc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $+ ?A[{JG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }\!38{&  
p[-bu B]  
  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: tr\}lfK%  
l=< :  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) > 9wEx[  
{ fdTyY ;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t5pf4M7  
 { ~4+=C\r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {EGm6WSQ^  
  SaveBmp(); w`J s "_\  
  return FALSE; 9:l>FoXS  
 } QK%6Ncv  
 …… //其它处理及默认处理 <CUe"WbE)  
} #x|h@(y|  
NEh5    
u4[3JI>  
  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。 i<nUp1r(  
&U8W(NxN  
  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。 W.AN0N  
g&"__~dS-F  
  二、编程步骤 C/Dc1sj  
9*}?0J8  
  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"; =-dk@s  
\[w82%U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B? r[|  
nzHsyL  
  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; rTjV/~  
G#;$;  
  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; ZO $}m?  
<<P& MObqj  
  5、 添加代码,编译运行程序。 "b"Q0"w  
0SBiMTm  
三、程序代码 g^DPb pWxu  
/a$RJ6t&3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wg[D*a  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |PED8K:rU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ RWi~34r  
#if _MSC_VER > 1000 :jq   
#pragma once DKfw8"L]  
#endif // _MSC_VER > 1000 IU`&h2KZ.  
#ifndef __AFXWIN_H__ ApYri|^r  
#error include 'stdafx.h' before including this file for PCH q E`  
#endif 3g]Sp/  
#include "resource.h" // main symbols tc'` 4O]c8  
class CHookApp : public CWinApp L 59q\_|  
{ rSVU|O3m;  
 public: 9+\3E4K  
  CHookApp(); gs_nUgcA  
  // Overrides }*4K]3et$  
  // ClassWizard generated virtual function overrides tc@([XqH  
  //{{AFX_VIRTUAL(CHookApp) ?B2 T'}~  
 public: ^\uj&K6l  
  virtual BOOL InitInstance(); <tbsQ3  
  virtual int ExitInstance(); *@r)3  
  //}}AFX_VIRTUAL 5h^U ]Y#  
  //{{AFX_MSG(CHookApp) MNKB4C8 >  
  // NOTE - the ClassWizard will add and remove member functions here. KS/1ux4x  
  // DO NOT EDIT what you see in these blocks of generated code ! wU#79:h  
  //}}AFX_MSG n^;:V8k  
  DECLARE_MESSAGE_MAP() "1H?1"w~  
}; nkp!kqJ09  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (:>: tcE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ||&EmH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qmcLG*^,  
BOOL InitHotkey(); dM(}1%2  
BOOL UnInit(); lk6*?EJ  
#endif SPxgIP;IR  
F.b;O :  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sSC yjS'T  
#include "stdafx.h" c"3 a,&  
#include "hook.h" ui,#AZQ#{4  
#include <windowsx.h> [*O#6Xu  
#ifdef _DEBUG Kd _tjWS  
#define new DEBUG_NEW {<a(1#{  
#undef THIS_FILE !'No5  
static char THIS_FILE[] = __FILE__; vb-L "S?kC  
#endif /u }AgIb  
#define MAX_KEY 100 E3\O?+ h#  
#define CTRLBIT 0x04 )x-iru A:  
#define ALTBIT 0x02 BOLG#}sm  
#define SHIFTBIT 0x01 9i8D_[  
#pragma data_seg("shareddata") D84`#Xbi  
HHOOK hHook =NULL; U<**Est  
UINT nHookCount =0; `<h}Ygo>k/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \5$N> 2kO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _W4i?Bde  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \$2E  
static int KeyCount =0; Kv[,!P"Y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qHfs*MBJ%  
#pragma data_seg() B1oy,'  
HINSTANCE hins; dwKre#4F  
void VerifyWindow(); HPAd@5d(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) z./M^7v?  
//{{AFX_MSG_MAP(CHookApp) 50oNN+; =R  
// NOTE - the ClassWizard will add and remove mapping macros here. UDHk@M  
// DO NOT EDIT what you see in these blocks of generated code! |*0oz=  
//}}AFX_MSG_MAP 5r qjqfFa  
END_MESSAGE_MAP() yG5T;O&  
~l%Dcp  
CHookApp::CHookApp() t+k"$zR  
{ #~54t0|Cd>  
 // TODO: add construction code here, }*m:zD@8$  
 // Place all significant initialization in InitInstance 9N|O*h1;u  
} c xdhG"  
$Xw .iN]g  
CHookApp theApp; 2jf-vWV_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (u-i{<   
{ nn"!x|c  
 BOOL bProcessed=FALSE; AA9OElCa  
 if(HC_ACTION==nCode) : 2?J#/o  
 { inavi5.  
  if((lParam&0xc0000000)==0xc0000000){// Key up v6 DN:!&  
   switch(wParam) Rx*T7*xg{  
   { L=Q- r[  
    case VK_MENU: z]> 0A  
     MaskBits&=~ALTBIT; ,ijgqEN  
     break; W$@q ~/E  
    case VK_CONTROL: *usfJ-  
     MaskBits&=~CTRLBIT; P@:#NU[  
     break; \Nu(+G?e  
    case VK_SHIFT:  gM20n^  
     MaskBits&=~SHIFTBIT; 2As 4}  
     break; W|3XD-v@  
    default: //judge the key and send message qtTys gv  
     break; '8~7Ru\KyX  
   } . zv F!!z  
   for(int index=0;index<MAX_KEY;index++){ Pv{ {zyc  
    if(hCallWnd[index]==NULL) =*qu:f\y  
     continue; -<a~kVv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YMwMaU)K,  
    { eMVfv=&L<3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b&A+`d  
     bProcessed=TRUE; Xvm.Un< N  
    } 1`2n<qo  
   } S5E mLgnRs  
  } i)P.Omr  
  else if((lParam&0xc000ffff)==1){ //Key down )+Wx!c,mb  
   switch(wParam) HFBGM\R02  
   {  "/6(  
    case VK_MENU: X%xX3e'  
     MaskBits|=ALTBIT; y@'8vOh`  
     break; {IJV(%E   
    case VK_CONTROL: +/7UM x1  
     MaskBits|=CTRLBIT; {%@zQ|OO0  
     break; [a\:K2*'  
    case VK_SHIFT: Lw?4xerLsb  
     MaskBits|=SHIFTBIT; =L9sb!  
     break; 8Vv"'CU#  
    default: //judge the key and send message 4aGV1u+4  
     break;  pzezN  
   } g1L$+xD^  
   for(int index=0;index<MAX_KEY;index++) +O}6 8 N  
   { w`,[w,t  
    if(hCallWnd[index]==NULL) FZz\z p  
     continue; fQlR;4QX]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _L(6F T J  
    { -*k%'Gr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #O z<<G<  
     bProcessed=TRUE; g/W<;o<v(I  
    } cUaLv1:HI  
   } R~CQ=KQ.  
  } {*As-Y:'F  
  if(!bProcessed){ I 6a{'c(P  
   for(int index=0;index<MAX_KEY;index++){ {QTfD~z^K  
    if(hCallWnd[index]==NULL) ^Qrdh0j  
     continue; *nluK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x SF#ys4v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eP|:b &  
   } b4!(~"b.  
  } AYd7qx:~  
 } 0tm%Kd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {bl&r?[y  
} ^6mlE+WY  
Xdsd5 UUM  
BOOL InitHotkey() |dpOE<f[  
{ VjSb>k   
 if(hHook!=NULL){ K0yTHX?(.  
  nHookCount++; rv1kIc5Za<  
  return TRUE; 2J^6(vk  
 } U5z^R>k  
 else }XWic88!~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BbA>1#i5]  
  if(hHook!=NULL) #QQ\xj  
   nHookCount++; L{ ?& .iA  
  return (hHook!=NULL); {f3)!Pei`J  
} m'XzZmI  
BOOL UnInit() EE#4,d`J  
{ gfw,S;  
 if(nHookCount>1){ dY68wW>d|  
  nHookCount--; "3LOL/7f  
  return TRUE; Xz4!#,z/  
 } v2G_p |+O  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pon 2!$  
 if(unhooked==TRUE){ mm'n#%\G  
  nHookCount=0; `MlQPLH  
  hHook=NULL; /$'tO3  
 } 1Z6<W~,1OM  
 return unhooked; sb Z)z#Tr  
} \/la`D  
`QXO+'j4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t8\F7F P  
{ +'2Mj|d@p  
 BOOL bAdded=FALSE; gpVZZ:~  
 for(int index=0;index<MAX_KEY;index++){ Yvs)H'n=  
  if(hCallWnd[index]==0){ *oL?R2#7  
   hCallWnd[index]=hWnd; f}0(qN/G  
   HotKey[index]=cKey; d3_aFs Q  
   HotKeyMask[index]=cMask; 9e^[5D=L  
   bAdded=TRUE; [!,&A{.!  
   KeyCount++; c<wsWs 4V  
   break; r#JE7uneT  
  } kq8:h  
 } $IA(QC_]AO  
 return bAdded; Oj\lg2Ck  
} HhhN8t  
D'ZR>@w@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hU3c;6]3  
{ L&MR%5  
 BOOL bRemoved=FALSE; WW\u}z.QJ  
 for(int index=0;index<MAX_KEY;index++){ =LDzZ:' X  
  if(hCallWnd[index]==hWnd){ O&V}T#8n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O;9u1,%w  
    hCallWnd[index]=NULL; I!dA{INN  
    HotKey[index]=0; /@X!  
    HotKeyMask[index]=0;  U2  
    bRemoved=TRUE; 5'd$TC  
    KeyCount--; 0=#:x()e  
    break; cKdn3 2Y4  
   } 0#<q]M?hW  
  } 'Xoif"  
 } " JFx  
 return bRemoved; %/"I.\%d  
} 2Hw&}8  
!'wh hi  
void VerifyWindow() D)U 9xA)J  
{ g&!UaJ[#9  
 for(int i=0;i<MAX_KEY;i++){ Hdw;=]-  
  if(hCallWnd!=NULL){ 6O bB/*h  
   if(!IsWindow(hCallWnd)){ {mrTpw  
    hCallWnd=NULL; >8D!K0?E  
    HotKey=0; L3GA]TIf  
    HotKeyMask=0; E^rKS&P  
    KeyCount--; d&4 ve Lu  
   } M(KsLu1   
  } ,7KP  
 } F&%@p&  
} ztTj2M"  
]W~\%`#8?  
BOOL CHookApp::InitInstance() :JH#*5%gQ:  
{ de1cl<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ck d@|  
 hins=AfxGetInstanceHandle(); 7DDd 1"jE  
 InitHotkey();  QMLz  
 return CWinApp::InitInstance(); 1"YN{Ut;G  
} 1fm4:xHH  
r/}q=J.  
int CHookApp::ExitInstance() >h1 3i@`r  
{ 1K?RA*aj  
 VerifyWindow(); ;>np2K<`  
 UnInit(); GK .^Gd  
 return CWinApp::ExitInstance(); /2l&D~d"  
} Z8E-(@`q5Q  
WHeyE3}p  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !iA 3\Ai"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `-W.uOZ0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ SK [1h3d  
#if _MSC_VER > 1000 :+NZW9_  
#pragma once <*EMcZ  
#endif // _MSC_VER > 1000 ?!^ow5"8  
n75)%-  
class CCaptureDlg : public CDialog WfpQ   
{ uNCM,J!#~  
 // Construction /4/'&tY  
 public: .Ds d Q4Y  
  BOOL bTray; U;`C%vHff  
  BOOL bRegistered; VK*Dm:G0  
  BOOL RegisterHotkey(); waI?X2  
  UCHAR cKey; [p3{d\=*?  
  UCHAR cMask; uP, iGA  
  void DeleteIcon(); /Cy4]1dw  
  void AddIcon(); mSLA4[4{  
  UINT nCount; B|pO2d e  
  void SaveBmp(); 5;'(^z-bL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor VzfaUAIZl  
  // Dialog Data 01=nS?  
  //{{AFX_DATA(CCaptureDlg) M.fAFL  
  enum { IDD = IDD_CAPTURE_DIALOG }; 'yxN1JF  
  CComboBox m_Key; O+x"c3@Z)D  
  BOOL m_bControl; $`j%z@[g  
  BOOL m_bAlt; ,1/O2aQ%\0  
  BOOL m_bShift; ]H| O  
  CString m_Path; 9<n2-l|)  
  CString m_Number; Ln:6@Ok)5%  
  //}}AFX_DATA !q\MXS($#u  
  // ClassWizard generated virtual function overrides ]QKo>7%[  
  //{{AFX_VIRTUAL(CCaptureDlg) p3r("\Za,  
 public: GsIVx!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6_|iXs(&  
 protected: z^lcc7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m%zo? e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `_aX>fw  
  //}}AFX_VIRTUAL ICck 0S!  
  // Implementation A0hKzj  
 protected: 6$CwH!42F  
  HICON m_hIcon; Jq>rA  
  // Generated message map functions Z$ ?(~ln  
  //{{AFX_MSG(CCaptureDlg) {uUV(FzF6  
  virtual BOOL OnInitDialog(); r1<dZtb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >~@O\n-t  
  afx_msg void OnPaint(); $7h]A$$Fv  
  afx_msg HCURSOR OnQueryDragIcon(); 4Vtu g>  
  virtual void OnCancel(); 1lo. X_  
  afx_msg void OnAbout(); Q$ +6f,m#W  
  afx_msg void OnBrowse(); u7&q(Z&&O  
  afx_msg void OnChange(); +YZ*>ki  
 //}}AFX_MSG #[ f]-c(!  
 DECLARE_MESSAGE_MAP() :eIi^K z[  
}; Z8C~o)n9  
#endif l266ufO.u-  
}1fi#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /RVwhA+c  
#include "stdafx.h" lfvt9!SJ+/  
#include "Capture.h" %k%%3L,  
#include "CaptureDlg.h" khX/xL  
#include <windowsx.h> oiyvKMHz7  
#pragma comment(lib,"hook.lib") e@hPb$7  
#ifdef _DEBUG C >OeULD  
#define new DEBUG_NEW HYl+xH'.j  
#undef THIS_FILE ]TrJ*~  
static char THIS_FILE[] = __FILE__; fN9{@)2Mz  
#endif i@/%E~W  
#define IDM_SHELL WM_USER+1 Vz mlKVE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G]B0LUT6c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  V FM[-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &OU.BR >  
class CAboutDlg : public CDialog 7] y3<t  
{ ,.Gp_BI  
 public: L`t786 (M  
  CAboutDlg(); h),;j`PrC  
  // Dialog Data oypLE=H  
  //{{AFX_DATA(CAboutDlg) B} qRz  
  enum { IDD = IDD_ABOUTBOX }; dwn|1%D  
  //}}AFX_DATA (s'xO~p  
  // ClassWizard generated virtual function overrides 1^k}GXsWmE  
  //{{AFX_VIRTUAL(CAboutDlg) P~(&lu/;P  
 protected: 6Emn@Mn=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n[/D>Pi  
  //}}AFX_VIRTUAL W@}@5,}f>  
  // Implementation $I5|rB/4?  
 protected: jHq+/\  
  //{{AFX_MSG(CAboutDlg) q`AsnAzo&  
  //}}AFX_MSG 3\2&?VAjR  
  DECLARE_MESSAGE_MAP() #mH28UT  
};  WDNj 7  
0,0WdJAe  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /:!sn-(  
{ 0Y`+L6&UX  
 //{{AFX_DATA_INIT(CAboutDlg) o=VZ7]  
 //}}AFX_DATA_INIT u9_? c G-  
} xgOt%7sb  
YWPkVvI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) # l1*#Z  
{ 2 zo>`;l  
 CDialog::DoDataExchange(pDX); 8\il~IFyi  
 //{{AFX_DATA_MAP(CAboutDlg) hQ3@CfW  
 //}}AFX_DATA_MAP 6@Q; LV+  
} #~Kno@  
^cd bM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ; <- f  
 //{{AFX_MSG_MAP(CAboutDlg) )~)T[S  
 // No message handlers J;fbE8x  
 //}}AFX_MSG_MAP dnANlNMk?  
END_MESSAGE_MAP() } %3;j5 ;6  
Sn97DCdk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) C B;j[.  
: CDialog(CCaptureDlg::IDD, pParent) = CXX.%N  
{ <MxA;A  
 //{{AFX_DATA_INIT(CCaptureDlg) }lk9|U#6*`  
  m_bControl = FALSE; k]4CN  
  m_bAlt = FALSE; &w_8E+Y Z  
  m_bShift = FALSE; h\C1:0x{  
  m_Path = _T("c:\\"); Kd}%%L  
  m_Number = _T("0 picture captured."); - 6q7ze{@  
  nCount=0; {s@&3i?ZiC  
  bRegistered=FALSE; _)CCD33$  
  bTray=FALSE; )x5w`N]lm  
 //}}AFX_DATA_INIT m=`V  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 T5[(vTp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @ /e{-Q  
} NR^Z#BU  
5"#xbvRS0H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N,)rrBD  
{ ~N2 [j  
 CDialog::DoDataExchange(pDX); S{cK~sZj  
 //{{AFX_DATA_MAP(CCaptureDlg) Dhft[mvo  
  DDX_Control(pDX, IDC_KEY, m_Key); enMHKN g  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); pfk)_;>,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Y Odwd}M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); CwF=@:*d  
  DDX_Text(pDX, IDC_PATH, m_Path); &I(3/u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); P\X$fD  
 //}}AFX_DATA_MAP N[=R$1\Z  
} ovtZHq/  
!O,`Z`T?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LZPLz@=&]  
//{{AFX_MSG_MAP(CCaptureDlg) yV@~B;eW0  
 ON_WM_SYSCOMMAND() ^O5PcV3Eg  
 ON_WM_PAINT() -A8CW9|mk  
 ON_WM_QUERYDRAGICON() :as2fO$?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uQkFFWS  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -1F+,+m  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m!<uY?,hf  
//}}AFX_MSG_MAP q-0( Wx9|  
END_MESSAGE_MAP() H+5N+AKb@  
:2&W9v  
BOOL CCaptureDlg::OnInitDialog() 3}?]G8iL?L  
{ &C E){jC  
 CDialog::OnInitDialog(); _K>YB>W}7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); pu+jw<7  
 ASSERT(IDM_ABOUTBOX < 0xF000); s4\_%je<v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9r,7>#IF  
 if (pSysMenu != NULL) pL'+sW  
 { y}lqF8s  
  CString strAboutMenu; p?sC</R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); g"v-hTx  
  if (!strAboutMenu.IsEmpty()) *p%=u>?&  
  { 20RISj  
   pSysMenu->AppendMenu(MF_SEPARATOR); Oc?]L&ap  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $~.'Tnk)  
  } }Ias7d?re  
 } }7|UA%xz  
 SetIcon(m_hIcon, TRUE); // Set big icon G8p6p6*  
 SetIcon(m_hIcon, FALSE); // Set small icon Zut"P3d=J  
 m_Key.SetCurSel(0); |`6*~ciUV  
 RegisterHotkey(); %:] ive]e  
 CMenu* pMenu=GetSystemMenu(FALSE); w57D qG>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kC-OZVoO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); r5\|%5=J  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); EJ`"npU  
 return TRUE; // return TRUE unless you set the focus to a control g flu!C6  
} *5|q_K Pt  
7^Q4?(A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q*4=sf,>  
{ :HQQ8uQfb  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) loFApBD=$^  
 { dBMr%6tz  
  CAboutDlg dlgAbout; -mK;f$X  
  dlgAbout.DoModal(); DF!*S{)  
 } w0L+Sj db  
 else $4a;R I  
 { 1US4:6xX_  
  CDialog::OnSysCommand(nID, lParam); 5WvtvSO  
 } `8D}\w<eI  
} yd4\%%]  
},LO]N|  
void CCaptureDlg::OnPaint() 8C>\!lW"  
{ Dm 0Ts~  
 if (IsIconic()) \_J;i[  
 { $@(+" $  
  CPaintDC dc(this); // device context for painting ii :E>O(0B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 05gdVa,  
  // Center icon in client rectangle Ga1(T$ |H  
  int cxIcon = GetSystemMetrics(SM_CXICON); Q,m1mIf  
  int cyIcon = GetSystemMetrics(SM_CYICON); nL@(|nJ[  
  CRect rect; Xe7/  
  GetClientRect(&rect);  )tW0iFY  
  int x = (rect.Width() - cxIcon + 1) / 2; zLda&#+  
  int y = (rect.Height() - cyIcon + 1) / 2; aBonq]W  
  // Draw the icon Td/J6Q9 0  
  dc.DrawIcon(x, y, m_hIcon); yO`HL'SMo  
 } AeN$AqQd/  
 else -\V!f6Q  
 { :@8N${7`$A  
  CDialog::OnPaint(); dF<GuS;l5  
 } =AIeYUh  
} .Do(iYO.L  
kMP3PS  
HCURSOR CCaptureDlg::OnQueryDragIcon() 'Wz`P#/  
{ nA?Ks!9T  
 return (HCURSOR) m_hIcon; oW \k%Vj  
} |)}&: xA%  
O4.`N?Xq  
void CCaptureDlg::OnCancel() }lP'bu  
{ J70r`   
 if(bTray) V>Vu)7  
  DeleteIcon(); _aj,tz  
  CDialog::OnCancel(); U1^3 &N8  
} *H({q`j33k  
p]E\!/  
void CCaptureDlg::OnAbout() d,d ohi  
{ me@xl }  
 CAboutDlg dlg; WAqH*LB  
 dlg.DoModal(); B9h'}460H  
} Xdtyer%  
>Xv Fg  
void CCaptureDlg::OnBrowse() SW WeN#Q  
{ ews{0  
 CString str; xjK@Q1MJ  
 BROWSEINFO bi; FX,kmre3  
 char name[MAX_PATH]; F+ Q(^Nk  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e[l#r>NT  
 bi.hwndOwner=GetSafeHwnd(); W|-<ekH_u  
 bi.pszDisplayName=name; =Hf`yH\#  
 bi.lpszTitle="Select folder"; \;bDDTM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :-)H tyzf  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GMW,+  
 if(idl==NULL) Mv\]uAT`  
  return; fZka$ 4  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P?/Mrz   
 str.ReleaseBuffer(); l:- <CbG  
 m_Path=str; (F=q/lK$  
 if(str.GetAt(str.GetLength()-1)!='\\') :xy4JRcF  
  m_Path+="\\"; ~U$ioQy<  
 UpdateData(FALSE); ~b;u1;ne  
} wGhy"1g#  
(t_%8Eu  
void CCaptureDlg::SaveBmp() /:-Y7M*   
{ #Pr w2u  
 CDC dc; *wp>a?sG\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N4rDe]JnPR  
 CBitmap bm; D7|qFx;]g  
 int Width=GetSystemMetrics(SM_CXSCREEN); y*H rv  
 int Height=GetSystemMetrics(SM_CYSCREEN); d8ck].m=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hZwJ@ Vm#  
 CDC tdc; NnTAKd8  
 tdc.CreateCompatibleDC(&dc); /Xf_b.ZM&  
 CBitmap*pOld=tdc.SelectObject(&bm); W!B\VB  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6BH P#B2j  
 tdc.SelectObject(pOld); %@'[g]h k  
 BITMAP btm; v\3$$T)  
 bm.GetBitmap(&btm); "(+p1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; O 4C}]E  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;GV~MH-F  
 BITMAPINFOHEADER bih; witx_r  
 bih.biBitCount=btm.bmBitsPixel; P&sYS<9q  
 bih.biClrImportant=0; fV o7wp  
 bih.biClrUsed=0; gn)>(MG  
 bih.biCompression=0; V)jF]u~g  
 bih.biHeight=btm.bmHeight; :R1F\FT*  
 bih.biPlanes=1; we&D"V  
 bih.biSize=sizeof(BITMAPINFOHEADER); O)%s_/UX  
 bih.biSizeImage=size; 0dCg/wJx  
 bih.biWidth=btm.bmWidth; hQ\W~3S55  
 bih.biXPelsPerMeter=0; *IQQsfL)  
 bih.biYPelsPerMeter=0; .1YiNmW=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); i{biQ|,.sL  
 static int filecount=0; 'mYUAVmSC#  
 CString name; l|sC\;S  
 name.Format("pict%04d.bmp",filecount++); TrR=3_;.7  
 name=m_Path+name; =`E{QCW  
 BITMAPFILEHEADER bfh; BI6]{ZC"  
 bfh.bfReserved1=bfh.bfReserved2=0; /Y0oA3am  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `h='FJ/!  
 bfh.bfSize=54+size; bzyy;`;6Q~  
 bfh.bfOffBits=54; jL,P )TC  
 CFile bf; NudY9 ~   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cP^c}e*;NS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); JmF:8Q3H  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); IN?6~O p  
  bf.WriteHuge(lpData,size); o:PdPuZVR  
  bf.Close(); CZDWEM}   
  nCount++; k]=lo'bF4  
 } khVfc  
 GlobalFreePtr(lpData); j^m x,  
 if(nCount==1) &f-x+y  
  m_Number.Format("%d picture captured.",nCount); 1T0s UIY  
 else 9w.ZXd  
  m_Number.Format("%d pictures captured.",nCount); Mz: "p.  
  UpdateData(FALSE); V6kJoSyde  
} ]N{jF$  
&Ivf!Bgm{Z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) FZ5 Ad&".@  
{ ^\g?uH6k U  
 if(pMsg -> message == WM_KEYDOWN)  Y3g<%6  
 { ;4k/h/o1#  
  if(pMsg -> wParam == VK_ESCAPE) b8&z~'ieR  
   return TRUE; IVso/!   
  if(pMsg -> wParam == VK_RETURN) !|~yf3  
   return TRUE; mbXW$E-&R2  
 } u9j1>QU  
 return CDialog::PreTranslateMessage(pMsg); yX%NFXD  
} i|!W;2KL5  
O{Y*a )"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;8g[y"I  
{ o[aIQ|G  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ q0KGI/5s4+  
  SaveBmp(); %mRnJgV5k  
  return FALSE; 4^7*R  
} #{5h6IC  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~\u~>mtchu  
 CMenu pop; / >O.U?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l4AXjq2  
 CMenu*pMenu=pop.GetSubMenu(0); AQD`cG  
 pMenu->SetDefaultItem(ID_EXITICON); O'S9y  
 CPoint pt; Q*8efzgs|  
 GetCursorPos(&pt); ^zKP5nzL  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $k^& X `  
 if(id==ID_EXITICON) ;CDa*(e  
  DeleteIcon();  / !aVv  
 else if(id==ID_EXIT) ,'byJlw_pv  
  OnCancel(); :nS p  
 return FALSE; VLC=>w\,  
} 3bagL)'iz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  h 3V; J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3w8v.J8q  
 AddIcon(); : 2A\X' @  
 return res; +T HBPEq  
} B3Ws)nF"  
H={5>;8G  
void CCaptureDlg::AddIcon() /J!~0~F  
{ dC?l%,W  
 NOTIFYICONDATA data; 3^]Kd  
 data.cbSize=sizeof(NOTIFYICONDATA); rQ)I  
 CString tip; K<p)-q  
 tip.LoadString(IDS_ICONTIP); 9,$ n 6t;  
 data.hIcon=GetIcon(0); R]NCD*~  
 data.hWnd=GetSafeHwnd(); ;eC8| Xz  
 strcpy(data.szTip,tip); Yq%r\[%*  
 data.uCallbackMessage=IDM_SHELL; =~'y'K]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; JPq' C$  
 data.uID=98; G!U `8R  
 Shell_NotifyIcon(NIM_ADD,&data); nBtKSNT#Q  
 ShowWindow(SW_HIDE); J )UCy;Y  
 bTray=TRUE; `86})xz{  
} uXVs<im  
:U6Q==B$_  
void CCaptureDlg::DeleteIcon()  )OZ  
{ H'jo 3d~+  
 NOTIFYICONDATA data; d+]/0J!c  
 data.cbSize=sizeof(NOTIFYICONDATA); a>#]d  
 data.hWnd=GetSafeHwnd(); ^`fqK4<  
 data.uID=98; .s>.O6(^%  
 Shell_NotifyIcon(NIM_DELETE,&data); ?{r-z3@ N  
 ShowWindow(SW_SHOW); 4]no#lVRJ  
 SetForegroundWindow(); +krDmU9(  
 ShowWindow(SW_SHOWNORMAL); qTV.DCP  
 bTray=FALSE; ^@;P-0Sy  
} du&9mOrr  
oEsqLh9a|  
void CCaptureDlg::OnChange() l:j>d^V*&x  
{ <,Fj}T-  
 RegisterHotkey(); % {A%SDh  
} \8]("l}ms8  
j~O"=?7!O  
BOOL CCaptureDlg::RegisterHotkey() `FAZAC\  
{ =/bC0bb{i  
 UpdateData(); PF:'dv  
 UCHAR mask=0; }M &hcw<  
 UCHAR key=0; TeH_DVxj  
 if(m_bControl) ) -@Dh6F  
  mask|=4; D3x W?$Z  
 if(m_bAlt) 8\m[Nuq5  
  mask|=2; >(a[b@[K  
 if(m_bShift) {#&jW  
  mask|=1; dwVo"_Yr  
  key=Key_Table[m_Key.GetCurSel()]; :CG;:( |  
 if(bRegistered){ #fxdZm,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); S{zl <>+  
  bRegistered=FALSE; *[tLwl.  
 } K4^mG  
 cMask=mask; c6LPqPcN  
 cKey=key; PB!*&T'!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eKL3Y_5p@  
 return bRegistered; B)s%B'  
} td|O#R  
\0z<@)r+AJ  
  四、小结 L!^^3vn  
_OJ19Ry  
  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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