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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: }t|i1{%_  
  J_<6;#  
  一、实现方法 |NTqJ j  
8"[{[<-   
  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: LF{8hC[  
m}beT~FT_  
#pragma data_seg("shareddata") ^mut-@ N9  
HHOOK hHook =NULL; //钩子句柄 A&jR-%JG  
UINT nHookCount =0; //挂接的程序数目 %Yg|QBm|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _Wp.s]D [  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 " w /Odd  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 4,=;:#n,J  
static int KeyCount =0; ZBQ@S  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1bDXv, nD  
#pragma data_seg() >C5u>@%9O  
k|jr+hmn":  
  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。 J9J/3O Q=  
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  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: I2) 2'j,B  
4T~wnTH0Xg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR SoFl]^l  
cKey,UCHAR cMask) [CAFh:o  
{ xNRMI!yv   
 BOOL bAdded=FALSE; `O%O[  
 for(int index=0;index<MAX_KEY;index++){ L@?3E`4/v  
  if(hCallWnd[index]==0){ V1Gnr~GM  
   hCallWnd[index]=hWnd; aM_O0Rn==  
   HotKey[index]=cKey; ^ME'D  
   HotKeyMask[index]=cMask; "F Etl(  
   bAdded=TRUE; .rX,*|1x  
   KeyCount++; ,sg\K> H=  
   break; [4yw? U  
  } IF6-VFY:6  
 } :+?r nb)N  
 return bAdded; 93,7yZ 5#  
} q(2ZJn13f  
//删除热键 ?O]RQXsZ2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X]W(  
{ uA t{WDHm  
 BOOL bRemoved=FALSE; _ib @<%  
 for(int index=0;index<MAX_KEY;index++){ AW!A +?F6  
  if(hCallWnd[index]==hWnd){ iG=Di)O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }{&;\^i  
    hCallWnd[index]=NULL; CHCT e  
    HotKey[index]=0; U+[ "b-c  
    HotKeyMask[index]=0; *l%&/\  
    bRemoved=TRUE; lO0}  
    KeyCount--; Jy('tfAHp  
    break; e:rbyzf#  
   } ]8'PLsS9<w  
  } *|@386\  
 } $e  uI  
 return bRemoved; T_9o0Qk  
} m GJRCK_  
)NqRu+j  
8NJT:6Q7l  
  DLL中的钩子函数如下: $(*>]PC+)  
qN Ut&#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @a 7U0$,O#  
{ Y|tK19  
 BOOL bProcessed=FALSE; 5;HCNwX  
 if(HC_ACTION==nCode) AYp~;@  
 { q_9 tbZ;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Wu$yB!  
   switch(wParam) V"}Jsr  
   {  BP\6N%HC%&  
    case VK_MENU: _w'_l>I  
     MaskBits&=~ALTBIT; !*?9n ^PaF  
     break; @tJic|)x  
    case VK_CONTROL: O,NVhU7,  
     MaskBits&=~CTRLBIT; >Ml5QO$*.q  
     break; *{\))Zmhd  
    case VK_SHIFT: (<e<Q~(  
     MaskBits&=~SHIFTBIT; MY}K.^ 4^  
     break; jCIY(/  
    default: //judge the key and send message [r'A8!/|[  
     break; ki1j~q  
   } &H+n0v  
   for(int index=0;index<MAX_KEY;index++){ ' d?6 L  
    if(hCallWnd[index]==NULL) 7lKatk+7K  
     continue; "I9r>=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~mMTfC~9  
    { K5jeazasp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8yH)9#>  
     bProcessed=TRUE; 3iL\<^d*ht  
    } }u{gQlV  
   } k*Aee7  
  } $2-_j)+  
  else if((lParam&0xc000ffff)==1){ //有键按下 S.<4t*,  
   switch(wParam) wTG(U3{3K  
   { O}}rosA  
    case VK_MENU: qL[ SwEc  
     MaskBits|=ALTBIT; Mq'm TM  
     break; l@-h.tS  
    case VK_CONTROL: (=EDqAZg  
     MaskBits|=CTRLBIT; ibG>|hV  
     break; w~Vqg:'\$  
    case VK_SHIFT: )8SWU)/  
     MaskBits|=SHIFTBIT; ^6LnB#C&  
     break; .*.eY?,V  
    default: //judge the key and send message sH > zsc  
     break; rUAt`ykTmN  
   }  _-9cGm v  
   for(int index=0;index<MAX_KEY;index++){ DQaE9gmC  
    if(hCallWnd[index]==NULL) qV/>d' ,  
     continue; ?ks.M'@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }6=)w@v  
    { A5%$<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \<G"9w  
     bProcessed=TRUE; |{_>H '  
    } $J&c1  
   } hhFO,  
  } >7S@3,C3ke  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]]3rSXs2}J  
   for(int index=0;index<MAX_KEY;index++){ j]vEo~Bbh  
    if(hCallWnd[index]==NULL) Nd{U|k3pL  
     continue; a;M{ -G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Fop +xR,Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,LxkdV  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 TU*EtE'g/  
   } bX` Gv+  
  } &|db}\jT  
 } KC9e{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ()F {kM8  
} 1xkrh qq  
ZmNNR 1%/  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:  p(8@  
*c&|2EsZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x}V&v?1{5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^H{YLO  
=Vazxt@[  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ' 2O @  
nAAv42j[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e?*Teb ?R  
{ * 1xs/$`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #.$y   
 { R^ P>yk8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "Aw)0a[j1  
  SaveBmp(); H\\FAOj  
  return FALSE; 5Z5x\CcC3  
 } <V Rb   
 …… //其它处理及默认处理 .>P:{''  
} QG2 Zh9R  
^NRf  
I0z7bx  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 o0|Ex\  
pe\Nwq  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 V/kndV[j  
oD1k7Gq1  
  二、编程步骤 Xc}XRKiy{  
<c:H u{D  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; evYn}  
J%M [8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6)P.wW  
C H 29kQ  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; NY.* S6  
~(kqq#=s  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; nJ xO.wWE  
]dI^ S  
  5、 添加代码,编译运行程序。 fb>$p_s]  
'%XYJr:H[  
三、程序代码 "J=Cy@SSa  
isQOt * i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL lG%697P  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +A)> zx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9OW8/H&!  
#if _MSC_VER > 1000 pt,L  
#pragma once a !%,2|U  
#endif // _MSC_VER > 1000 }(|gC,  
#ifndef __AFXWIN_H__ LdN[N^n[H  
#error include 'stdafx.h' before including this file for PCH k0K$OX*:e  
#endif p'1/J:EnV  
#include "resource.h" // main symbols {\P%J:s#9  
class CHookApp : public CWinApp r~ 2*'zB  
{ x3+ {Y  
 public: ^879sI  
  CHookApp(); >X' -J{4R  
  // Overrides $D#h, `  
  // ClassWizard generated virtual function overrides kP ,8[r  
  //{{AFX_VIRTUAL(CHookApp)  k%i.B  
 public: a%`%("g!  
  virtual BOOL InitInstance(); }$'_%,  
  virtual int ExitInstance(); E5M/XW\E6  
  //}}AFX_VIRTUAL !]82$  
  //{{AFX_MSG(CHookApp) |D"L!+J-$  
  // NOTE - the ClassWizard will add and remove member functions here. hr6j+p:  
  // DO NOT EDIT what you see in these blocks of generated code ! Zr2!}jD9a  
  //}}AFX_MSG :T G;W,`.V  
  DECLARE_MESSAGE_MAP() c {%mi  
}; 40h$- VYT/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 80[# 6`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vk4 8&8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kw" y#Ys]  
BOOL InitHotkey(); #X?[")R  
BOOL UnInit(); jYRSV7d  
#endif H>%AK''  
$["HC-n?.k  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. j2UQQFh  
#include "stdafx.h" e&d$kUJrq  
#include "hook.h" \GxqE8  
#include <windowsx.h> #]tDxZ] 6  
#ifdef _DEBUG Hy&Z0W'l  
#define new DEBUG_NEW #?>)5C\Hqy  
#undef THIS_FILE ]Z8u0YtM)  
static char THIS_FILE[] = __FILE__; 4^l9d  
#endif 4oiE@y&{4  
#define MAX_KEY 100 `cXLa=B)9  
#define CTRLBIT 0x04 >RkaFcq  
#define ALTBIT 0x02 8X"4RyNSn  
#define SHIFTBIT 0x01 cOX)+53  
#pragma data_seg("shareddata") wTU$jd1;+  
HHOOK hHook =NULL; w|s2f`!  
UINT nHookCount =0; n-cI~Ax+4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `hkvxt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT YYYF a  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `@],J  
static int KeyCount =0; v#%rjml[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift otR7E+*3  
#pragma data_seg() |<,qnf | -  
HINSTANCE hins; vu\W5M  
void VerifyWindow(); 'kt6%d2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @Xl(A]w%!  
//{{AFX_MSG_MAP(CHookApp) s.i9&1Y-!  
// NOTE - the ClassWizard will add and remove mapping macros here. WF~BCP$OR  
// DO NOT EDIT what you see in these blocks of generated code! z}u`45W+  
//}}AFX_MSG_MAP w a(Y[]V  
END_MESSAGE_MAP() ISs&1`Y  
s_IFl5D]  
CHookApp::CHookApp() %"A8Af**I  
{ >,]a>V  
 // TODO: add construction code here, N wk  
 // Place all significant initialization in InitInstance )- &@ 8`  
} t,|Apl]  
O@a OKk  
CHookApp theApp; ~Dq-q6-@t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q| 1%G Nb  
{ ~&D =;M/  
 BOOL bProcessed=FALSE; `mz}D76~#  
 if(HC_ACTION==nCode) C?gqX0[ q  
 { 04Zdg:[3-!  
  if((lParam&0xc0000000)==0xc0000000){// Key up rCDt9o>  
   switch(wParam) <1*.:CL"s  
   { \#:  W  
    case VK_MENU: ;7:} iKU  
     MaskBits&=~ALTBIT; 8p%0d`sX  
     break; SQ4^sk_!  
    case VK_CONTROL: z:f&k}(  
     MaskBits&=~CTRLBIT;  g]?pY  
     break; zl :by?  
    case VK_SHIFT: 6LCtWX  
     MaskBits&=~SHIFTBIT; p7Wt(A  
     break; }vZf&ib-   
    default: //judge the key and send message -J+1V{  
     break; ~iH a^i?2*  
   } :a;F3NJ  
   for(int index=0;index<MAX_KEY;index++){ @e3+Gs  
    if(hCallWnd[index]==NULL) {L7Pha  
     continue; > UZ-['H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k}fC58q  
    { Tty'ysH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); yO)xN=o^\  
     bProcessed=TRUE; }? / Blr  
    } B1 }-   
   } /'jX_ V_$|  
  } + m-88  
  else if((lParam&0xc000ffff)==1){ //Key down #ay/VlD@  
   switch(wParam) NgyEy n \  
   { QvZ"{  
    case VK_MENU: FJtmRPP[r  
     MaskBits|=ALTBIT; _`? cBu`  
     break;  (yP1}?  
    case VK_CONTROL: d9v66mpJM  
     MaskBits|=CTRLBIT; <?7qI85OT  
     break; .4%z$(+6  
    case VK_SHIFT: 3xs<w7  
     MaskBits|=SHIFTBIT; G]rY1f0  
     break; t/Io.d   
    default: //judge the key and send message MygAmV&  
     break; 9 fB|e|  
   } ' 9f0UtT|[  
   for(int index=0;index<MAX_KEY;index++) >va_,Y}  
   { =fRS UtX  
    if(hCallWnd[index]==NULL) aJ(/r.1G  
     continue; Y`j$7!j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L'{W|Xb+  
    { c<|y/n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c rb^TuN  
     bProcessed=TRUE; s oY\6mHio  
    } '/8/M{`s  
   } <WIIurp  
  } b:F;6X0~Hl  
  if(!bProcessed){ PEvY3F}_rh  
   for(int index=0;index<MAX_KEY;index++){ [oU\l+t  
    if(hCallWnd[index]==NULL) f5 bq)Pm&  
     continue; vmAnBY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n5d8^c!2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `YqtI/-w  
   } 6o#/[Tz  
  } {OPEW`F  
 } B3ItZojAuw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V>QyiB  
} 9{;L7`<  
#8et91qw  
BOOL InitHotkey() `r1}:`.m,  
{ 3!p`5hJd  
 if(hHook!=NULL){ s;TB(M~i[  
  nHookCount++; (%L /|F_  
  return TRUE; 8C3oi&av/{  
 } -yqgs>R(d  
 else A3/[9}(U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \bdKLcKI,  
  if(hHook!=NULL) *`+zf7-f  
   nHookCount++; EX_j|/&tZ  
  return (hHook!=NULL); LMoZI0)x  
} zr?s5RS  
BOOL UnInit() 7!AyLw  
{ j<(E %KN3  
 if(nHookCount>1){ 0V<kpC,4  
  nHookCount--; kMVr[q,MEq  
  return TRUE; O`y3H lc  
 } GLO3v. n;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -b^dK)wR~  
 if(unhooked==TRUE){ >} 2C,8N  
  nHookCount=0; ys=} V|  
  hHook=NULL; D?_K5a&v,  
 } "G@K(bnHn  
 return unhooked; eB#I-eD  
} y5eEEG6  
Un K7&Uo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a 4ViVy  
{ ;iiCay37F  
 BOOL bAdded=FALSE; h_4*?w  
 for(int index=0;index<MAX_KEY;index++){ ( /I6Wa  
  if(hCallWnd[index]==0){ q3#[6!  
   hCallWnd[index]=hWnd; nvndgeSy  
   HotKey[index]=cKey; P0}B&B/a:  
   HotKeyMask[index]=cMask; .hx(9  
   bAdded=TRUE; E \/[hT  
   KeyCount++; ?:$ q~[LY  
   break; Kb+SssF  
  } vgy.fP"@  
 } KR$Fd  
 return bAdded; 14'\@xJMM  
} 4q]6[/  
j2,sI4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZJ%NZAxy  
{ ppz3"5  
 BOOL bRemoved=FALSE; E:8*o7  
 for(int index=0;index<MAX_KEY;index++){ BmV `<Q,  
  if(hCallWnd[index]==hWnd){ 8  *f 9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5.VPK 338A  
    hCallWnd[index]=NULL; eaf-_#qb  
    HotKey[index]=0; ]#G s6CsT|  
    HotKeyMask[index]=0; nRBS&&V  
    bRemoved=TRUE; 6,YoP|@0  
    KeyCount--; 3 zh:~w_  
    break; :8@)W<>%  
   } 2p, U ^h  
  } nlB'@r  
 } =.8n K y  
 return bRemoved; gra6&&^"  
} %@C8EFl%3  
-OJ<Lf+"=  
void VerifyWindow() .Qrpz^wdt  
{ H]tD~KM<  
 for(int i=0;i<MAX_KEY;i++){ Rr [_t FM  
  if(hCallWnd!=NULL){ fd *XK/h  
   if(!IsWindow(hCallWnd)){ R-m5(  
    hCallWnd=NULL; %/I:r7UR{  
    HotKey=0; ;l!<A  
    HotKeyMask=0; 3H!]X M  
    KeyCount--; ;7s^slVzF  
   } _{'[Uf/l  
  } +m./RlQ{  
 } mQ`atFz:Z  
} wY ItG"+6  
T9$~tv,5F  
BOOL CHookApp::InitInstance() R*bx&..<  
{ sPQj B[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S~:uOm2t\  
 hins=AfxGetInstanceHandle(); ^|Z'}p|&  
 InitHotkey(); a&JY x  
 return CWinApp::InitInstance(); 3}\z&|  
} z` 6$p1U  
PpFQoY7M  
int CHookApp::ExitInstance() 'sI ne>  
{ 8WV5'cX  
 VerifyWindow(); 2?7ID~\  
 UnInit(); PsUO8g'\  
 return CWinApp::ExitInstance(); VX&g[5zr  
} ;MGm,F,o  
H_f8/H  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?S& yF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z&H.fsL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @}6<,;|DQ  
#if _MSC_VER > 1000 H,TApF89A  
#pragma once "=DQ {(L  
#endif // _MSC_VER > 1000 WwsNAJ  
$ H+X'1  
class CCaptureDlg : public CDialog ^J>m4`  
{ ng+sK  
 // Construction :"# "{P  
 public: -Wa<}Tz  
  BOOL bTray; CP\[9#]:  
  BOOL bRegistered; fSd|6iFH  
  BOOL RegisterHotkey(); \h'7[vkr  
  UCHAR cKey; uT=r*p(v  
  UCHAR cMask; S8AbLl9G@>  
  void DeleteIcon(); AQ$)JPs  
  void AddIcon(); ZgEV-.>P  
  UINT nCount; =LLpJ+  
  void SaveBmp(); V/xXW=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %'WC7s  
  // Dialog Data qery|0W  
  //{{AFX_DATA(CCaptureDlg) (pCHj'  
  enum { IDD = IDD_CAPTURE_DIALOG }; pmBN?<  
  CComboBox m_Key; Sydl[c pH$  
  BOOL m_bControl; W3[>IH"+  
  BOOL m_bAlt; [nHN@ p|  
  BOOL m_bShift; v\bWQs1  
  CString m_Path; axmq/8X  
  CString m_Number; l4T[x|')M  
  //}}AFX_DATA yHE\Q  
  // ClassWizard generated virtual function overrides j xI;clr  
  //{{AFX_VIRTUAL(CCaptureDlg) Ju#j%!  
 public: lS Y "  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [ p,]/ ^ N  
 protected: |e!Y C iU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8Kl&_-l{b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9LPXhxNwB  
  //}}AFX_VIRTUAL >y8>OJ?A7-  
  // Implementation @nwVl8  
 protected: G?v <-=I  
  HICON m_hIcon; !D1#3?L  
  // Generated message map functions -cUbIbW  
  //{{AFX_MSG(CCaptureDlg) *2/qm:gB  
  virtual BOOL OnInitDialog(); tt-ci,X+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MzB.Vvsy%9  
  afx_msg void OnPaint(); &V 7J5~_  
  afx_msg HCURSOR OnQueryDragIcon(); Y>3zpeQ!&  
  virtual void OnCancel(); ;Egl8Vhr  
  afx_msg void OnAbout(); 6I(Y<LZ5  
  afx_msg void OnBrowse(); {.oz^~zs]g  
  afx_msg void OnChange(); u= dj3q  
 //}}AFX_MSG &bJBsd@Os  
 DECLARE_MESSAGE_MAP() R%r25_8  
}; yz0#0YG7  
#endif g]h@U&`~u_  
pvl];w  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ylos6]zS8  
#include "stdafx.h" VTR4uT-  
#include "Capture.h" v(0ujfSR0  
#include "CaptureDlg.h" au19Q*r9  
#include <windowsx.h> G[ns^  
#pragma comment(lib,"hook.lib") CB9:53zK9  
#ifdef _DEBUG #\N8E-d  
#define new DEBUG_NEW /zh:7N  
#undef THIS_FILE [bKc5qp  
static char THIS_FILE[] = __FILE__; @?J7=}bzz  
#endif kK4+K74B  
#define IDM_SHELL WM_USER+1 ZYY~A_C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2V;{@k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %w>3Fwj`z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 61QA<Wb  
class CAboutDlg : public CDialog lGK7XAx,  
{  7Oe$Ou  
 public: z7BFkZ6+  
  CAboutDlg(); C8v  
  // Dialog Data zQO 1%g  
  //{{AFX_DATA(CAboutDlg) AXxyB"7A}  
  enum { IDD = IDD_ABOUTBOX }; O0rvr$.  
  //}}AFX_DATA )%p46(]  
  // ClassWizard generated virtual function overrides H(Wiy@cJn  
  //{{AFX_VIRTUAL(CAboutDlg) kLF3s#k  
 protected: pRlScD_};  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d^54mfgI  
  //}}AFX_VIRTUAL +68age;dM  
  // Implementation 6qmV/DL  
 protected: ,_V/W'  
  //{{AFX_MSG(CAboutDlg) z@ZI$.w  
  //}}AFX_MSG J"h2"$v,  
  DECLARE_MESSAGE_MAP() 7g Ou|t  
}; 1Hhr6T^)  
6yUThv.G#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I AUc.VH  
{ wAu]U6!  
 //{{AFX_DATA_INIT(CAboutDlg) }+S~Ah?(  
 //}}AFX_DATA_INIT *!%n`BR '  
} L$"x*2[A  
F@ |(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^^ SMr l  
{ ^o>WCU=  
 CDialog::DoDataExchange(pDX); OXZK|C;M}  
 //{{AFX_DATA_MAP(CAboutDlg) *C|*{!  
 //}}AFX_DATA_MAP 90F.9rh  
} E}%Pwr  
5cM%PYU4:v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^vVAuO  
 //{{AFX_MSG_MAP(CAboutDlg) SJc*Rl>  
 // No message handlers fUis_?!  
 //}}AFX_MSG_MAP }jce5E  
END_MESSAGE_MAP() ^wSGrV'  
-/B*\X[  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &)Zv>P8z`  
: CDialog(CCaptureDlg::IDD, pParent) jC:D>  
{ N0$ uB"  
 //{{AFX_DATA_INIT(CCaptureDlg) z*b|N45O  
  m_bControl = FALSE; wZCboQ,  
  m_bAlt = FALSE; Fsq)co  
  m_bShift = FALSE; Exv!!0Cd^  
  m_Path = _T("c:\\"); iu{;|E  
  m_Number = _T("0 picture captured."); VR_/Vh ]@  
  nCount=0; /_expSPHl  
  bRegistered=FALSE; v`'Iew }  
  bTray=FALSE; h(~of (  
 //}}AFX_DATA_INIT GU1cMe  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 mW[w4J+7P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IcqzMm b  
} FncP,F$8   
wj'fdrY5h  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X-bM`7'H  
{ bs% RWwn  
 CDialog::DoDataExchange(pDX); &'DR`e O)  
 //{{AFX_DATA_MAP(CCaptureDlg) D8B\F5..c#  
  DDX_Control(pDX, IDC_KEY, m_Key); ]RadwH"0!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .*595SuF  
  DDX_Check(pDX, IDC_ALT, m_bAlt); d6m&nj  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ??#EG{{  
  DDX_Text(pDX, IDC_PATH, m_Path); /18fpH|  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2RqV\Jik  
 //}}AFX_DATA_MAP DuAix)#FN9  
} S+eu3nMq  
f2KH&j>~r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D'D IC  
//{{AFX_MSG_MAP(CCaptureDlg) is%ef  
 ON_WM_SYSCOMMAND() JX>`N5s  
 ON_WM_PAINT() F!?f|z,/  
 ON_WM_QUERYDRAGICON() kDR5kDiS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |yj0Rv  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  cFjD*r-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \ ux {J  
//}}AFX_MSG_MAP c\szy&W  
END_MESSAGE_MAP() DtS7)/<T  
2}.~ 6EU/  
BOOL CCaptureDlg::OnInitDialog() 5[*8C Y  
{ BG 4TUt  
 CDialog::OnInitDialog(); YiL^KK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }U}ppq0Eo  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]haQ#e}WH  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %l%2 hvGZ  
 if (pSysMenu != NULL) p ]s)Xys  
 { d,'gh4C  
  CString strAboutMenu; }KftV nD?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ='e_9b\K  
  if (!strAboutMenu.IsEmpty()) 5VVU%STP  
  { 7~N4~KAUS  
   pSysMenu->AppendMenu(MF_SEPARATOR); Ak}`zIo  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); OSJj^Y)W|  
  } pgv, Su  
 } x'Nc}  
 SetIcon(m_hIcon, TRUE); // Set big icon 0d 0ga^O  
 SetIcon(m_hIcon, FALSE); // Set small icon $(yi+v  
 m_Key.SetCurSel(0); y<BG-  
 RegisterHotkey(); Xoq -  
 CMenu* pMenu=GetSystemMenu(FALSE); I34 1s0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1:|o7`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Iy4 RE P|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); OzTR#`oey  
 return TRUE; // return TRUE unless you set the focus to a control i8*(J-M  
} \2Q#'  
M,r8 No  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) u@Z6)r'  
{ G]Im.x3O-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) vZqW,GDfXo  
 { cwHbm%  
  CAboutDlg dlgAbout; -2C^M> HZ  
  dlgAbout.DoModal(); r"VNq&v]9  
 } gla'urb[i|  
 else 0@ vzQ$  
 { !bX   
  CDialog::OnSysCommand(nID, lParam); tI.ho  
 } |*8X80<  
} u&f|z9  
%Go/\g   
void CCaptureDlg::OnPaint() ],zp~yVU&  
{ AJoP3Zv|?  
 if (IsIconic()) h54\ \Ci  
 { 9'vf2) "  
  CPaintDC dc(this); // device context for painting }n,LvA@[0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1 :{+{Yl7  
  // Center icon in client rectangle ZlQ&m  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6>'>BamX  
  int cyIcon = GetSystemMetrics(SM_CYICON); UnZc9 6  
  CRect rect; W yP]]I.  
  GetClientRect(&rect); YEB7X>p#  
  int x = (rect.Width() - cxIcon + 1) / 2; GN+,9  
  int y = (rect.Height() - cyIcon + 1) / 2; A`I1G9s  
  // Draw the icon uy|]@|J  
  dc.DrawIcon(x, y, m_hIcon); (3j f_  
 } {Q^ -  
 else 83)m#  
 { $?OQtz@  
  CDialog::OnPaint(); #zb67mg~  
 } BGstf4v>A<  
} /1+jQS  
X9&>.?r  
HCURSOR CCaptureDlg::OnQueryDragIcon() R0q|{5S  
{ DKNcp8<J  
 return (HCURSOR) m_hIcon; #)%X0%9.*<  
} JUq7R%"h6  
T IyHM1+  
void CCaptureDlg::OnCancel()  Ozsvsa  
{ AG G xx?I  
 if(bTray) W7\UZPs5t  
  DeleteIcon(); *4Z! 5iOs  
  CDialog::OnCancel(); )<5hga][~a  
} "2"2qZ*h}  
8&7zV:=  
void CCaptureDlg::OnAbout() AbX#wpp!  
{  "'Q~&B;@  
 CAboutDlg dlg; $o ;48uV^  
 dlg.DoModal(); u*T#? W?  
} q9Lq+4\  
V#~.n ;d  
void CCaptureDlg::OnBrowse() Saks~m7,  
{ C&.Q|S2_  
 CString str;  Q 6r  
 BROWSEINFO bi; WvcPOt8Bp>  
 char name[MAX_PATH]; :;&3"-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }e>OmfxDBt  
 bi.hwndOwner=GetSafeHwnd(); uJ3*AO  
 bi.pszDisplayName=name; %)o;2&aD  
 bi.lpszTitle="Select folder"; LP?*RrM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; z E\~Oa;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); tSTl#xy  
 if(idl==NULL) 8`|Z9umW*  
  return; "Q[?W( SA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;F /w&u.n  
 str.ReleaseBuffer(); }l5Q0'  
 m_Path=str; 87R$Y> V  
 if(str.GetAt(str.GetLength()-1)!='\\') =o[H2o y  
  m_Path+="\\"; {t('`z  
 UpdateData(FALSE); oe=W}y_k  
} VexQ ]  
(%4O\ s#l  
void CCaptureDlg::SaveBmp() VE^IA\J x  
{ ?+byRoY>&g  
 CDC dc; -[z1r)RZ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Z:VT%-  
 CBitmap bm; 6 _#CvQ  
 int Width=GetSystemMetrics(SM_CXSCREEN); z'Ut9u  
 int Height=GetSystemMetrics(SM_CYSCREEN); uA\KbA.c;U  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \IOF 9) F  
 CDC tdc; ql_,U8Jw  
 tdc.CreateCompatibleDC(&dc); ii ^Nxnc=  
 CBitmap*pOld=tdc.SelectObject(&bm); $KsB'BZy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8y]{I^z}  
 tdc.SelectObject(pOld); Lv-M.  
 BITMAP btm; ~W_ T3@  
 bm.GetBitmap(&btm); jq(rnbV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; u/` t+-A  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8@KGc )k  
 BITMAPINFOHEADER bih; T ?{F7  
 bih.biBitCount=btm.bmBitsPixel; i >BQRbU  
 bih.biClrImportant=0; p '=XW#2 >  
 bih.biClrUsed=0; R1Q~UX]d=  
 bih.biCompression=0; or[!C %  
 bih.biHeight=btm.bmHeight; 2'}/aL|G  
 bih.biPlanes=1; w2V:g$~,  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2&2t8.<  
 bih.biSizeImage=size; L#MMNc+  
 bih.biWidth=btm.bmWidth; 0w6"p>s>c  
 bih.biXPelsPerMeter=0; 2-rfFqpe  
 bih.biYPelsPerMeter=0; t28 y=nv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); `Oe}OSxnT  
 static int filecount=0; p$$0**p!`  
 CString name; t'HrI-x  
 name.Format("pict%04d.bmp",filecount++); ,'@t .XP  
 name=m_Path+name; rKr\Qy+q  
 BITMAPFILEHEADER bfh; O?Qi  
 bfh.bfReserved1=bfh.bfReserved2=0; e @|uG%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ['aiNhlbt  
 bfh.bfSize=54+size; @.h;k4TD  
 bfh.bfOffBits=54; PLK;y  
 CFile bf; GO6uQ};  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T{lK$j  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); O/fm/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); er2#h  
  bf.WriteHuge(lpData,size); ifadnl26 s  
  bf.Close(); Gp1?drF6  
  nCount++; K^c%$n:}+  
 } P A$jR fQ  
 GlobalFreePtr(lpData); kp,$ NfD  
 if(nCount==1) b25C[C5C  
  m_Number.Format("%d picture captured.",nCount); ynZfO2kf  
 else dK7BjZTJo  
  m_Number.Format("%d pictures captured.",nCount); !eD f}~  
  UpdateData(FALSE); =gO4B-[  
} 1*OZu.NdK  
A7aW]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]J.|XRp/  
{ B{7hRk.5!  
 if(pMsg -> message == WM_KEYDOWN) W>E|Iv[o  
 { *;~i\M9_  
  if(pMsg -> wParam == VK_ESCAPE) 3d(:Y6D)  
   return TRUE; o3oTu  
  if(pMsg -> wParam == VK_RETURN) 'H'R6<z5  
   return TRUE; G]gc*\4  
 } 5:SS2>~g  
 return CDialog::PreTranslateMessage(pMsg); }%S#d&wh$_  
} w!52DBOe+  
< !PbD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p^ )iC&*0  
{ DP!~WkU~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2h`Tn{&1/  
  SaveBmp(); --F6n/>  
  return FALSE; rpv<'$6  
} b yX)4&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e0`5PVJ  
 CMenu pop; Vv*](iM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); + y|Q7+  
 CMenu*pMenu=pop.GetSubMenu(0); B5!|L)7>{p  
 pMenu->SetDefaultItem(ID_EXITICON); 70N Lv  
 CPoint pt; 7K /quJ  
 GetCursorPos(&pt); F;Bq[V)R  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |) CfO4  
 if(id==ID_EXITICON) kB_T9$0e#  
  DeleteIcon(); r!/<%\S  
 else if(id==ID_EXIT) \y+@mJWa  
  OnCancel(); X`fer%`  
 return FALSE; 6~a4-5;>z  
} *+j r? |  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MD[;Ha  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;AJ6I*O@+  
 AddIcon();  x]~&4fp  
 return res; `5MK(K :  
} 6sNw#pqh  
GyQvodqD  
void CCaptureDlg::AddIcon() Qv1cf  
{ ria.MCe\!  
 NOTIFYICONDATA data; WO[O0!X  
 data.cbSize=sizeof(NOTIFYICONDATA); # 2?3B  
 CString tip; \ 9#X]H  
 tip.LoadString(IDS_ICONTIP); gh.+}8="  
 data.hIcon=GetIcon(0); [s~6,wz  
 data.hWnd=GetSafeHwnd(); x+,:k=JMT  
 strcpy(data.szTip,tip); 5a2+6N  
 data.uCallbackMessage=IDM_SHELL; NwNjB w%v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g\G}b  
 data.uID=98; xi15B5 _Ps  
 Shell_NotifyIcon(NIM_ADD,&data); !Mj28  
 ShowWindow(SW_HIDE); 4z,/0  
 bTray=TRUE; h.5KzC S  
} MCl-er"]D  
"$A5:1;  
void CCaptureDlg::DeleteIcon() -mG ,_}F  
{ z(1`Iy M  
 NOTIFYICONDATA data; |F&02 f!]@  
 data.cbSize=sizeof(NOTIFYICONDATA); pSodT G$E  
 data.hWnd=GetSafeHwnd(); +w8$-eFY  
 data.uID=98; n {..Q,z  
 Shell_NotifyIcon(NIM_DELETE,&data); tiF-lq  
 ShowWindow(SW_SHOW); %;b]k  
 SetForegroundWindow(); wnHfjF  
 ShowWindow(SW_SHOWNORMAL); aA'of>'ib|  
 bTray=FALSE; __`6 W1  
} S%df'bh$  
k;jXVa  
void CCaptureDlg::OnChange() Qn)AS1pL+  
{ &A~hM[-  
 RegisterHotkey(); hY|-l%2f  
} 05o<fa2HE  
W;|%)D)y  
BOOL CCaptureDlg::RegisterHotkey() ,n &Lp  
{ \W 7pSV-U  
 UpdateData(); t@q==VHF  
 UCHAR mask=0; DY1"t7 9E  
 UCHAR key=0; 06[HE7  
 if(m_bControl) ^m-w@0^z  
  mask|=4; 'Ej+Jczzpp  
 if(m_bAlt) 3|bbJ6*.<  
  mask|=2; bRK\Tua 6  
 if(m_bShift) OtoG,~?  
  mask|=1; 'ji|'x T  
  key=Key_Table[m_Key.GetCurSel()]; "b\@.7".  
 if(bRegistered){ sCE%./h]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )oy+-1dE  
  bRegistered=FALSE; ff 6x4t  
 } f(T`(pX0V  
 cMask=mask; )C0d*T0i  
 cKey=key; C@u}tH )  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Wjr^: d  
 return bRegistered; "%#CMCE|f  
} 5E =!L g  
&.P G2f*  
  四、小结 HF*j=qt!  
n _kE  
  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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