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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: {a:05Y  
  NEri{qxm  
  一、实现方法 Nq6'7'x  
GN(<$,~g  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: j"69uj` R  
~,HFd`  
#pragma data_seg("shareddata") qEST[S V  
HHOOK hHook =NULL; //钩子句柄 J}X{8Ds9  
UINT nHookCount =0; //挂接的程序数目 FHSoj=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 V<0iYi;4=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 CPP~,E_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?";SUku  
static int KeyCount =0; ,=m.WmXE  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Jd>~gA}l  
#pragma data_seg() s51$x M  
J @"#  
  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。 +hmFFQQ}  
.w.:o2L  
  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: LJ(WU)CPc  
= (F   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -o6rY9\_!  
cKey,UCHAR cMask) -y+>^45  
{ :OY~Q3 @  
 BOOL bAdded=FALSE; 'cXdc  
 for(int index=0;index<MAX_KEY;index++){ UUJQc ~=  
  if(hCallWnd[index]==0){ != ,4tg`  
   hCallWnd[index]=hWnd; "S%t\  
   HotKey[index]=cKey; EX`P(=zD  
   HotKeyMask[index]=cMask; `R[ZY!=+  
   bAdded=TRUE; Fr8GGN~/  
   KeyCount++; 5XZ! yYB?  
   break; oY18a*_>M1  
  } }p7iv:P=3  
 } }6c>BU}DF  
 return bAdded; ijF_ KP'  
} ump~)?_B  
//删除热键 KT(Z #$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @yaFN>w  
{ JF .Lo;  
 BOOL bRemoved=FALSE; (8JU!lin  
 for(int index=0;index<MAX_KEY;index++){ 5G* cAlU  
  if(hCallWnd[index]==hWnd){ } p'ZMj&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;hX(/T  
    hCallWnd[index]=NULL; 6gg8 h>b  
    HotKey[index]=0; $E\|\g  
    HotKeyMask[index]=0; d!y*z  
    bRemoved=TRUE; <=q} Nd\  
    KeyCount--; ' [ 4;QYw  
    break; d,"LZ>hNY*  
   } F1t(P 8  
  } z*eBjHbF  
 } smQ^(S^  
 return bRemoved; 2@D`^]]  
} &r5q,l&@n  
5yy:JTAH5  
`C+<! )2  
  DLL中的钩子函数如下: @!#e\tx  
DmiBM6t3N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jhNFaBrS  
{ %fqR  
 BOOL bProcessed=FALSE; ~?Q sr  
 if(HC_ACTION==nCode) 9oWU]A\k>  
 { o%$.8)B9F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9)q3cjP{<  
   switch(wParam) 5</$dcG  
   {  Wy}I"q[~So  
    case VK_MENU: <\aeC2~M  
     MaskBits&=~ALTBIT; i q(PC3e`V  
     break; 'pdTV:]zA  
    case VK_CONTROL: XIHN6aQ{X  
     MaskBits&=~CTRLBIT; |p11Jt[  
     break; -Aj)<KNx[  
    case VK_SHIFT: (\9`$   
     MaskBits&=~SHIFTBIT; V#t_gS  
     break; X W)TI  
    default: //judge the key and send message "ZuuSi  
     break; &XP(D5lf`B  
   } ff"wg\O4  
   for(int index=0;index<MAX_KEY;index++){ %@/^UE:  
    if(hCallWnd[index]==NULL) J-F".6i5  
     continue; G6sK3K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XIeLu"TSL  
    { ~Iu!B Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ggr  
     bProcessed=TRUE; ;;Q^/rkC  
    } )O]T}eI  
   } WSkGVQu  
  } =l ,P'E  
  else if((lParam&0xc000ffff)==1){ //有键按下 0B NLTRv  
   switch(wParam) xt{'Be&Ya+  
   { H",B[ YK  
    case VK_MENU: _'u]{X\k{J  
     MaskBits|=ALTBIT; E$e7(D  
     break; /:&!o2&1H  
    case VK_CONTROL: D6sw"V#  
     MaskBits|=CTRLBIT; k*.]*]   
     break; hRcb}>pr  
    case VK_SHIFT: c?p^!zG  
     MaskBits|=SHIFTBIT; U@lc 1#  
     break; NR{wq|"  
    default: //judge the key and send message &1xCPKIr  
     break; aER|5!7(2\  
   } 9(CvGzco <  
   for(int index=0;index<MAX_KEY;index++){ @fL ^I&++  
    if(hCallWnd[index]==NULL) OZ,kz2SF#  
     continue; /HC:H,"i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p5Q]/DhG  
    { f^WTsh]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KhCP9(A=Qo  
     bProcessed=TRUE; v<qh;2  
    } '=\}dav!  
   } IP~!E_e}\  
  } ^4y]7 p  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;SR ESW  
   for(int index=0;index<MAX_KEY;index++){ FqKJids-  
    if(hCallWnd[index]==NULL) ;t`  ?|  
     continue; EP;/[O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WeI+|V$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |D3u"Y!:^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (JhX:1  
   } N0U/u'J!g  
  } #Ondhy%h[  
 } X|M!Nt0'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E-MPFL  
} {Z.6\G&q  
DT1gy:?L  
  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: x%P|T3Qy5  
p|4qkJK8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fn#8=TIDf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }kbSbRH43  
[\uR3$j#  
  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: g|=_@ pL  
73WSW/^F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) H#- 3  
{ +>w]T\[1~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]6&NIz`:,  
 { W+nu=iQ!  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r );R/)&  
  SaveBmp(); e5 =d Ev  
  return FALSE; 9N ]Xa  
 } wN 2+3LY{  
 …… //其它处理及默认处理 Rd?}<L  
} Z5{a7U4z_  
&dtk&P{  
Ycm)PU["  
  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。 QaX.Av  
0MQ= Rt  
  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。 od;-D~  
l/$GF|`U  
  二、编程步骤 _Fb}zPU!  
w7nt $L5  
  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"; #XV=,81w  
sE9FT#iE  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8 WP>u8&  
$o6/dEKQ  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; &}ZmT>q`$  
N,ht<l\  
  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; E3L?6Qfx>  
I8F+Z  
  5、 添加代码,编译运行程序。 ] !UYl  
BT{;^Hp  
三、程序代码 J=V  
yr]ja-Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \}-4(Xdaq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) LyUn!zV$(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ BEZ~<E&0H  
#if _MSC_VER > 1000 <sdgL+&1h  
#pragma once &9k~\;x  
#endif // _MSC_VER > 1000  urp|@WZ  
#ifndef __AFXWIN_H__ ^({)t  
#error include 'stdafx.h' before including this file for PCH c,UJ uCZ  
#endif (su,= Z  
#include "resource.h" // main symbols " T(hcI   
class CHookApp : public CWinApp ?}||?2=P  
{ Jx*cq;`Vee  
 public: J5@08 bZm  
  CHookApp(); 77e*9/6@  
  // Overrides ^df wWP  
  // ClassWizard generated virtual function overrides U~ {k_'-i  
  //{{AFX_VIRTUAL(CHookApp) +^I0> \  
 public: sW^M  ]  
  virtual BOOL InitInstance(); &K[*vyD  
  virtual int ExitInstance(); pjl%Jm  
  //}}AFX_VIRTUAL 4Z)4WGp!  
  //{{AFX_MSG(CHookApp) P -m_],  
  // NOTE - the ClassWizard will add and remove member functions here. dQut8>0&  
  // DO NOT EDIT what you see in these blocks of generated code ! '1<Z"InU  
  //}}AFX_MSG {N(qS'N  
  DECLARE_MESSAGE_MAP() +vc+9E.?9  
}; OhF55,[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); DF%d/a{]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;w{<1NH2+.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IQQv+af5  
BOOL InitHotkey(); [|\6AIoS  
BOOL UnInit(); #J5BHY~  
#endif 9O[IR)O~  
:]"5UY?oF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {1GJ,['qL  
#include "stdafx.h" ;qx#]Z0 <  
#include "hook.h" 2Gyq40  
#include <windowsx.h> $CcjuPsK  
#ifdef _DEBUG %wD#[<BGn>  
#define new DEBUG_NEW *MJm:  
#undef THIS_FILE Q G) s  
static char THIS_FILE[] = __FILE__; j:9M${~  
#endif $0*sj XV  
#define MAX_KEY 100 Xz]l#w4 Pp  
#define CTRLBIT 0x04 D{9a'0J  
#define ALTBIT 0x02 W5j wD  
#define SHIFTBIT 0x01 , 3R=8  
#pragma data_seg("shareddata") z%&FLdXgW+  
HHOOK hHook =NULL; o$_0Qs$  
UINT nHookCount =0; /SvhOi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <J%qzt}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T/$ gnn  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w+$$uz  
static int KeyCount =0; /%$Zm^8c  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift LUbhTc  
#pragma data_seg() +cpb!YEAb  
HINSTANCE hins; 1nVQYqT_  
void VerifyWindow(); 2g(_Kdj*{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) vrn4yHoZ  
//{{AFX_MSG_MAP(CHookApp) t]c<HDCK  
// NOTE - the ClassWizard will add and remove mapping macros here. ?pL|eS7  
// DO NOT EDIT what you see in these blocks of generated code! tX*@r  
//}}AFX_MSG_MAP B=Hd:P|  
END_MESSAGE_MAP() UlXm4\@  
9~ p;iiKGG  
CHookApp::CHookApp() Zy0M\-Mn  
{ VPN 9 Ql=  
 // TODO: add construction code here, 7o4E_ .*  
 // Place all significant initialization in InitInstance O{:{P5  
} Y A.&ap  
h'ik3mLH  
CHookApp theApp; =D zrM%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q\oa<R D5  
{ <O jK $KV  
 BOOL bProcessed=FALSE; 2OG/0cP  
 if(HC_ACTION==nCode) Q0*E&;|  
 { 8 Ku9;VEk  
  if((lParam&0xc0000000)==0xc0000000){// Key up N'1I6e"  
   switch(wParam) ]dycesc'  
   { \Y#  
    case VK_MENU: _KRnx-  
     MaskBits&=~ALTBIT; YznL+TD  
     break; a )O"PA}2  
    case VK_CONTROL: as07~Xvp-  
     MaskBits&=~CTRLBIT; -]%EX:bm  
     break; b+s'B4@rb  
    case VK_SHIFT: -]EL|_;  
     MaskBits&=~SHIFTBIT; q NGR6i  
     break; 4S(G366  
    default: //judge the key and send message T! }G51  
     break; /N0mF< P  
   } z$<=8ox8e  
   for(int index=0;index<MAX_KEY;index++){ A;!5c;ftj,  
    if(hCallWnd[index]==NULL) [bLKjD  
     continue; vbJ<|#|r-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mQj#\<*  
    { 4vg,g(qi<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DksYKv  
     bProcessed=TRUE; NT6jwK.?)?  
    } R ENCk (  
   } [gzaOP`f  
  } bbL\xq^  
  else if((lParam&0xc000ffff)==1){ //Key down =i~ = |K!  
   switch(wParam) @= <{_p  
   { .+7n@Sc  
    case VK_MENU: d% EdvM|)  
     MaskBits|=ALTBIT; DLwlA !z  
     break; 'm0WPS/6E  
    case VK_CONTROL: t/i*.>7  
     MaskBits|=CTRLBIT; R6~6b&-8  
     break; tbQY&TO1  
    case VK_SHIFT: x1=`Z@^  
     MaskBits|=SHIFTBIT; '[ c-$X2Ak  
     break; WO>A55Xya  
    default: //judge the key and send message RqROl!6  
     break; l6zAMyau5  
   } EXdX%T\  
   for(int index=0;index<MAX_KEY;index++) ^%oH LsY9  
   { q\tr&@4iC  
    if(hCallWnd[index]==NULL) /OKp(u;)z  
     continue; +kI}O*s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6>?qBWW  
    { (4Db%Iw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); za>%hZf\  
     bProcessed=TRUE; nS#F*)  
    } oy[s])Tg  
   } e_-g|ukC  
  } ]W3u~T*  
  if(!bProcessed){ #jbC@A9Pe  
   for(int index=0;index<MAX_KEY;index++){ l@4pZkdq  
    if(hCallWnd[index]==NULL) DzC`yWstP  
     continue; q~>!_q]FE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .J.}}"+U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :7@[=n  
   } 8hV]t'/;  
  } hn.(pI1  
 } *gmc6xY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); y^r'4zN'  
} X&Oo[Z  
?`TQ!m6y  
BOOL InitHotkey() II^Rp],>  
{ ~U+<JC Z  
 if(hHook!=NULL){ Y1o[|yt W  
  nHookCount++; (R=ZI  
  return TRUE; hLfWDf*T|  
 }  2  
 else _Q:ot'(~0-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); P]"@3Z&w  
  if(hHook!=NULL) =Vh]{ y~$  
   nHookCount++; OL1xxzo  
  return (hHook!=NULL); $7X;FmlG&  
} +@$VJM%^7b  
BOOL UnInit() l|842N@1  
{ yXkQ ,y  
 if(nHookCount>1){ /{({f?k<\/  
  nHookCount--; %n]jsdE^|  
  return TRUE; J^t0M\  
 } Qfeu3AT  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [,&g46x22  
 if(unhooked==TRUE){ aT/2rMKPF  
  nHookCount=0; QAI=nrlp  
  hHook=NULL; A@M2(?w4  
 } Zn1((J7  
 return unhooked; /XG7M=A$o  
} i~GW  
yI=nu53BV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z4 z|B&  
{ :Gz$(!j1.'  
 BOOL bAdded=FALSE; h-.^*=]R6  
 for(int index=0;index<MAX_KEY;index++){ -/3h&g  
  if(hCallWnd[index]==0){ lBn<\Y!^  
   hCallWnd[index]=hWnd; !B[ Y?b:  
   HotKey[index]=cKey; e_Zs4\^ef  
   HotKeyMask[index]=cMask; <S_0=U  
   bAdded=TRUE; [YQtX_;w  
   KeyCount++; oCwep^P(v  
   break; ;E}&{w/My  
  } "-fyX!  
 } &=zJ MGa  
 return bAdded; 0"-H34M <D  
} SFzoRI=qG  
x1 LI&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AsS~TLG9p  
{ ldG8hK  
 BOOL bRemoved=FALSE; HJr*\%D}1  
 for(int index=0;index<MAX_KEY;index++){ MPp:EH  
  if(hCallWnd[index]==hWnd){ ( *26aMp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YTgT2w  
    hCallWnd[index]=NULL; q.:a4w J  
    HotKey[index]=0; qHrIs-NR  
    HotKeyMask[index]=0; 5m;pHgkb  
    bRemoved=TRUE; [)Ia Xa  
    KeyCount--; 3b?-83a  
    break; >$<Q:o}^  
   } zBrIhL]95  
  } tIA)LF  
 } r& RJ'z  
 return bRemoved; `,  |l  
} 823y;  
| /-# N  
void VerifyWindow() AED 9vDE  
{ CE183l\  
 for(int i=0;i<MAX_KEY;i++){ yl<=_Q  
  if(hCallWnd!=NULL){ 9<Zm}PE32  
   if(!IsWindow(hCallWnd)){ VQ~eg wJL  
    hCallWnd=NULL; I%?M9y.u6  
    HotKey=0; 1_~'?'&^  
    HotKeyMask=0; 7Aw <:  
    KeyCount--; J_ h\tM  
   } 8=\k<X{`  
  } 2}{[ J  
 } }k1[Fc|  
} oOQan  
r|jBKq~  
BOOL CHookApp::InitInstance() qyIy xJ  
{ 6{Bvl[mhI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3,+Us B%  
 hins=AfxGetInstanceHandle(); RXPl~]k#i  
 InitHotkey(); ;?o"{mbb  
 return CWinApp::InitInstance(); oxCfSA  
} sx9[#6~{Y  
(ds*$]  
int CHookApp::ExitInstance() fQU_A  
{ a.<!>o<t:  
 VerifyWindow(); @S012} xH  
 UnInit(); ? !34qh  
 return CWinApp::ExitInstance(); E;a9RV|  
} WsM/-P1Y  
bF@iO316H  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^w RD|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P.|g4EdND  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~fA H6FdZ\  
#if _MSC_VER > 1000 iow8H' F  
#pragma once =66,$~g{  
#endif // _MSC_VER > 1000 )o_$AbPt  
87V XVI  
class CCaptureDlg : public CDialog `tsqnw  
{ i];@e]   
 // Construction "%t !+E>nr  
 public: g.EKdvY"%H  
  BOOL bTray; 1 pzd  
  BOOL bRegistered; 9e 1KH'  
  BOOL RegisterHotkey(); K)oN^  
  UCHAR cKey; 6 dCqS  
  UCHAR cMask; iu,Bmf^oD  
  void DeleteIcon(); 6? (8KsaN  
  void AddIcon(); dZbG#4oO  
  UINT nCount; Ks7kaX  
  void SaveBmp();  hWu#}iN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?@_,_gTQ  
  // Dialog Data `=foB-(zt  
  //{{AFX_DATA(CCaptureDlg) pQxi0/dp  
  enum { IDD = IDD_CAPTURE_DIALOG }; @}N;C ..Y$  
  CComboBox m_Key; [C~{g#  
  BOOL m_bControl; jr5x!@rb  
  BOOL m_bAlt; W/R-~C e  
  BOOL m_bShift; fm% Y*<Y"  
  CString m_Path; Y)4D$9:  
  CString m_Number; hta$ k%2  
  //}}AFX_DATA KWV{wW=-  
  // ClassWizard generated virtual function overrides 5h(] S[Zf3  
  //{{AFX_VIRTUAL(CCaptureDlg) gs|%3k|  
 public: =mk7'A>l  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y-,1&$&  
 protected: 0:Lm=9o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]+S.#x`#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tU7eW#"w  
  //}}AFX_VIRTUAL k4-C*Gx$h  
  // Implementation 7,"1%^tU  
 protected: <BN)>NqM  
  HICON m_hIcon; PFIL)D |G  
  // Generated message map functions c~Hq.K$d  
  //{{AFX_MSG(CCaptureDlg) bs mnh_YRj  
  virtual BOOL OnInitDialog(); =l3* { ?G  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); oM-@B'TK  
  afx_msg void OnPaint(); \bb,gRfP  
  afx_msg HCURSOR OnQueryDragIcon(); ,G,T&W  
  virtual void OnCancel(); #6JCm!s  
  afx_msg void OnAbout(); S,v9\wN.  
  afx_msg void OnBrowse(); 'm"H*f  
  afx_msg void OnChange(); x2TCw  
 //}}AFX_MSG Rf\>bI<.  
 DECLARE_MESSAGE_MAP() _hLM\L  
}; NLF{W|X  
#endif S*CRVs  
P>kS$U)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @*l}2W  
#include "stdafx.h" M|`%4vk>  
#include "Capture.h" p<6pmW3  
#include "CaptureDlg.h" \Jv6Igu  
#include <windowsx.h> y#Ch /Jg?|  
#pragma comment(lib,"hook.lib") 58MBG&a%  
#ifdef _DEBUG $0K9OF9$  
#define new DEBUG_NEW /^0Hi4+\  
#undef THIS_FILE D1lHq/  
static char THIS_FILE[] = __FILE__; Hj;j\R >2  
#endif +3t(kQ  
#define IDM_SHELL WM_USER+1 2Sb~tTGz79  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A0WQZt!FEN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7IZ(3B<87t  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ipKkz  
class CAboutDlg : public CDialog +2W#= G  
{ 4k$BqM1  
 public: 8N8B${X  
  CAboutDlg(); dmrM %a}W-  
  // Dialog Data "Rs^0iT7>  
  //{{AFX_DATA(CAboutDlg) 9^s sT>&/  
  enum { IDD = IDD_ABOUTBOX }; +|( eP_  
  //}}AFX_DATA WE`Y!  
  // ClassWizard generated virtual function overrides Jp5~iC2d  
  //{{AFX_VIRTUAL(CAboutDlg) Vv=d*  
 protected: }(TZ}* d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7,jh44(\=  
  //}}AFX_VIRTUAL kS?!"zk>  
  // Implementation ^X0<ZI  
 protected: )X| uOg&|  
  //{{AFX_MSG(CAboutDlg) t_@%4Wn!1L  
  //}}AFX_MSG eVbHPu4  
  DECLARE_MESSAGE_MAP() R^_/iy  
}; +69sG9BA  
4"wuqr|o  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8<?60sj  
{ "PJ@Q9n__  
 //{{AFX_DATA_INIT(CAboutDlg) {?BxVDD07  
 //}}AFX_DATA_INIT |'=R`@w~0  
} 2lHJ&fck<  
='OPU5(;O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a*S4rq@  
{ R[Kyq|UyVr  
 CDialog::DoDataExchange(pDX); aCFO ]  
 //{{AFX_DATA_MAP(CAboutDlg) cy/;qd+!M  
 //}}AFX_DATA_MAP u& :-&gva  
} Y@^M U->+  
"o}3i!2Qr  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) > -Jd@7-  
 //{{AFX_MSG_MAP(CAboutDlg) tX Z5oG7  
 // No message handlers vVZ@/D6w  
 //}}AFX_MSG_MAP `Nu3s<O7CF  
END_MESSAGE_MAP() |7UR_(}KC  
81H04L9K 7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1c+[S]7rY  
: CDialog(CCaptureDlg::IDD, pParent) -Vt*(L  
{ aeE9dV~  
 //{{AFX_DATA_INIT(CCaptureDlg) T3)/?f?|  
  m_bControl = FALSE; ^^)D!I"cA,  
  m_bAlt = FALSE; A^ t[PKM"  
  m_bShift = FALSE; H`aqpa"C  
  m_Path = _T("c:\\"); qV^,muyoG  
  m_Number = _T("0 picture captured."); !lL21C6g+  
  nCount=0; E@P8-x'i  
  bRegistered=FALSE; -5d8j<,  
  bTray=FALSE; d^WVWk K  
 //}}AFX_DATA_INIT 8TC%]SvYim  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 FrB}2  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nP4jOq*H  
} O^4:4tRpt  
Z]":xl\7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) AXz'=T}{  
{ )5)S8~Oc  
 CDialog::DoDataExchange(pDX); p?=rQte([  
 //{{AFX_DATA_MAP(CCaptureDlg) N~g'Z `  
  DDX_Control(pDX, IDC_KEY, m_Key); z)yxz:E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); KS1Z&~4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Qy5\qW'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *w59BO&M4  
  DDX_Text(pDX, IDC_PATH, m_Path); z9YC9m)jK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y*B}^!k6  
 //}}AFX_DATA_MAP L&Bc-kMH  
} Nx;U]O6A  
?7/n s>}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R.*KaCA  
//{{AFX_MSG_MAP(CCaptureDlg) W<u63P  
 ON_WM_SYSCOMMAND() -GDX#A-J  
 ON_WM_PAINT() -`FTWH  
 ON_WM_QUERYDRAGICON() KE&Y~y8O\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) TR5"K{WDx  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :_i1)4[!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) GmPNzHDb  
//}}AFX_MSG_MAP r2qxi'  
END_MESSAGE_MAP() oAA%pZ@  
B@=+Fg DD  
BOOL CCaptureDlg::OnInitDialog() \O^b|0zc  
{ D%Hz'G0|  
 CDialog::OnInitDialog(); -?&wD["y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }*hY#jo1  
 ASSERT(IDM_ABOUTBOX < 0xF000); @T|mHfQ8  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y 7|x<Z  
 if (pSysMenu != NULL) h$G&4_O  
 { yx4B!U  
  CString strAboutMenu; c*9RzD#Zj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /^ hB6_'D  
  if (!strAboutMenu.IsEmpty()) aYkm]w;C  
  { +kd88Fx  
   pSysMenu->AppendMenu(MF_SEPARATOR); e$45OL  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ma: xxsH.  
  } J}hi)k  
 } S`5^H~  
 SetIcon(m_hIcon, TRUE); // Set big icon +D*b!5[  
 SetIcon(m_hIcon, FALSE); // Set small icon b-@6w(j  
 m_Key.SetCurSel(0); `)*   
 RegisterHotkey(); x4pl#~Su  
 CMenu* pMenu=GetSystemMenu(FALSE); peY(4#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W0K&mBu  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); SVpvx`&kT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6cb;iA  
 return TRUE; // return TRUE unless you set the focus to a control U z>5!_  
} $oHlfV/!  
 ^GB9!d.  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h3h2 KqM'  
{  Ma0_!|i  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) S92'\2  
 { Bi ]`e_(}  
  CAboutDlg dlgAbout; 8G?'F${`  
  dlgAbout.DoModal(); 68kxw1xY  
 } &^8>Kd8  
 else #%il+3J  
 { z%Op_Ddp  
  CDialog::OnSysCommand(nID, lParam); <=/v%VXPm  
 } Ny /bNQS  
} G0^WQQ4  
u 3wF)B{  
void CCaptureDlg::OnPaint() #9,!IW]l  
{ 4^1{UlCop  
 if (IsIconic()) xO`w| k  
 { gz;().{  
  CPaintDC dc(this); // device context for painting o) `zb?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p^Kp= z  
  // Center icon in client rectangle vtc} )s\  
  int cxIcon = GetSystemMetrics(SM_CXICON); U#gHc:$  
  int cyIcon = GetSystemMetrics(SM_CYICON); Pwt4e-  
  CRect rect; x#|=.T  
  GetClientRect(&rect); gEcVQPD@  
  int x = (rect.Width() - cxIcon + 1) / 2; i%GjtYjS  
  int y = (rect.Height() - cyIcon + 1) / 2; R0(Nw7!d/[  
  // Draw the icon 0cC5  
  dc.DrawIcon(x, y, m_hIcon); ?g&6l0 n`  
 } {d.`0v9h  
 else |Vs|&0  
 { ;``*]tY$  
  CDialog::OnPaint(); y/K%F,WMf  
 } @] 1E~  
} VjS %!P  
Oj:O-PtN2  
HCURSOR CCaptureDlg::OnQueryDragIcon() `zAV#   
{ l!ltgj  
 return (HCURSOR) m_hIcon; Hv>A$x$q  
} 6]Q ~c"+5  
!bFa\6]q  
void CCaptureDlg::OnCancel() h6}oRz9=g  
{ B!K{y>|.  
 if(bTray) c=<d99Cu!  
  DeleteIcon(); C"PN3>x}j  
  CDialog::OnCancel(); hun L V8z  
} a5{CkM&,(  
#m1e_[   
void CCaptureDlg::OnAbout() UB@>i3  
{ 6|r` k75.  
 CAboutDlg dlg; #\"8sY,j  
 dlg.DoModal(); Y.sf^}  
} Unc;@=c  
L`cc2.F  
void CCaptureDlg::OnBrowse() AMA :hQ  
{ 1!/cd;{B  
 CString str; ;LELC5[*s  
 BROWSEINFO bi; yHLc lv  
 char name[MAX_PATH]; ',n;ag`c  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #.?DsK_:@  
 bi.hwndOwner=GetSafeHwnd(); s/0-DHd  
 bi.pszDisplayName=name; 9aD6mp  
 bi.lpszTitle="Select folder"; Fl>v9%A  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; KS}Ci-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .Ej `!  
 if(idl==NULL) eXx6b~D  
  return; "Nj(0&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cpz}!D  
 str.ReleaseBuffer(); E,JDO d}  
 m_Path=str; >^ 0JlL`XG  
 if(str.GetAt(str.GetLength()-1)!='\\') ,Ej2]iO\7  
  m_Path+="\\"; di]z  
 UpdateData(FALSE); zNuiB LxDs  
} cRs Lt/Wr  
Mii-Q`.:  
void CCaptureDlg::SaveBmp() n=MdbY/k(  
{ Qf0$Z.-  
 CDC dc; SE)_5|k*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =H.l/'/Z  
 CBitmap bm; z11;r]VI  
 int Width=GetSystemMetrics(SM_CXSCREEN); S,fMGKcq  
 int Height=GetSystemMetrics(SM_CYSCREEN); Za}*6N=?*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .+]e9mV  
 CDC tdc; *E+2E^B  
 tdc.CreateCompatibleDC(&dc); FSoL|lH  
 CBitmap*pOld=tdc.SelectObject(&bm); @=h%;"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); - y{*U1[  
 tdc.SelectObject(pOld); >~_y\  
 BITMAP btm; 9G` 2t~%  
 bm.GetBitmap(&btm); "zc@(OA[z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $TU=^W)X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); d?Gf T$1  
 BITMAPINFOHEADER bih; \ v44Vmfz  
 bih.biBitCount=btm.bmBitsPixel; nS"K dPM  
 bih.biClrImportant=0; o<1e-  
 bih.biClrUsed=0; GBzC<e#  
 bih.biCompression=0; s+(%N8B  
 bih.biHeight=btm.bmHeight; 7f8%WD)  
 bih.biPlanes=1; BWFl8 !_X  
 bih.biSize=sizeof(BITMAPINFOHEADER); /p~"?9b[ i  
 bih.biSizeImage=size; \)eHf 7H  
 bih.biWidth=btm.bmWidth; ~0w7E0DE[  
 bih.biXPelsPerMeter=0; 6%H8Q v  
 bih.biYPelsPerMeter=0; ,w; ~R4x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VQU[5C  
 static int filecount=0; C6,GgDH`  
 CString name; p18-yt; 1  
 name.Format("pict%04d.bmp",filecount++); D-9zg\\'`  
 name=m_Path+name; {/uBZ(   
 BITMAPFILEHEADER bfh; W:O<9ZbQ_  
 bfh.bfReserved1=bfh.bfReserved2=0; ~:b bV6YO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); D QP#h5O  
 bfh.bfSize=54+size; GRCc<TM, U  
 bfh.bfOffBits=54; m8n!<_NFt(  
 CFile bf; Y;6<AIx>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #QXv[%k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $SSE\+|3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pRx^O F(3  
  bf.WriteHuge(lpData,size); OOQf a#~k  
  bf.Close(); au9r)]p-  
  nCount++; O_K@\<;~  
 } {R `IA|T#k  
 GlobalFreePtr(lpData); /_@S*=T5  
 if(nCount==1) nL5Gr:SLo  
  m_Number.Format("%d picture captured.",nCount); *=ftg&  
 else Ev0GAc1  
  m_Number.Format("%d pictures captured.",nCount); p^Ca-+R3  
  UpdateData(FALSE); EJjTf:  
} ;38W41d{  
:^0g}8$<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UBOCd[  
{ OMd{rH  
 if(pMsg -> message == WM_KEYDOWN) Q-F'-@`(C  
 { jV\M`=4IC  
  if(pMsg -> wParam == VK_ESCAPE) Q\z3YUk  
   return TRUE; E$.|h;i]Q  
  if(pMsg -> wParam == VK_RETURN) fU@}]&  
   return TRUE; ~'dnrhdme  
 } L Tp5T|O  
 return CDialog::PreTranslateMessage(pMsg); <4bv=++pS  
} Ictc '#y  
E}lU?U5i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a({qc0+UK  
{ _DMj )enH"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c=I!?a"  
  SaveBmp(); |2CW!is  
  return FALSE; (6A>:_)  
}  twz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9<kKno  
 CMenu pop; )PL'^gR r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); , M/-lW  
 CMenu*pMenu=pop.GetSubMenu(0); T~s/@*y9  
 pMenu->SetDefaultItem(ID_EXITICON); 8H./@~_ =  
 CPoint pt; #j d?ocoY  
 GetCursorPos(&pt); g,Kb9['  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZB:Fjq  
 if(id==ID_EXITICON) daWmF  
  DeleteIcon(); tirw{[X0n  
 else if(id==ID_EXIT) CEc& G  
  OnCancel(); ^8.R 'Yq  
 return FALSE; Tr)a6Cf  
} d%1S6eYa'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [ w  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MFX&+c  
 AddIcon(); (sS[F-2R7  
 return res; C@pDX>~2=b  
} -4,qAnuMx  
nuw90=qj!]  
void CCaptureDlg::AddIcon() *u>2"!+Ob  
{ eG|e1tK+  
 NOTIFYICONDATA data; -yg9ug  
 data.cbSize=sizeof(NOTIFYICONDATA); _E)xR  
 CString tip; \9Itu(<f  
 tip.LoadString(IDS_ICONTIP); 9V?MJZ@aG  
 data.hIcon=GetIcon(0); AS|gi!OVA  
 data.hWnd=GetSafeHwnd(); P0RM df  
 strcpy(data.szTip,tip); / Zz2=gDY  
 data.uCallbackMessage=IDM_SHELL; qz E/n   
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4I"QT(;  
 data.uID=98; EYGJDv(S  
 Shell_NotifyIcon(NIM_ADD,&data); TnL%_!V!  
 ShowWindow(SW_HIDE); MgHyKn'rL  
 bTray=TRUE; WaWT 5|A  
} { YJ.BWr  
Xu3^tH-b<  
void CCaptureDlg::DeleteIcon() _M:)x0("  
{ dLD"Cx  
 NOTIFYICONDATA data; a&#Z=WK4  
 data.cbSize=sizeof(NOTIFYICONDATA); 1)#<nk)I  
 data.hWnd=GetSafeHwnd(); ~IE:i-Kz  
 data.uID=98; =zVbZ7  
 Shell_NotifyIcon(NIM_DELETE,&data); 1kio.9NIp  
 ShowWindow(SW_SHOW); 1dfA 8=L,s  
 SetForegroundWindow(); '0H +2  
 ShowWindow(SW_SHOWNORMAL); 5ez"B]&T  
 bTray=FALSE; 5zpk6FR$  
} mt fDl;/D  
H\8i9RI  
void CCaptureDlg::OnChange() +SPC@E_v  
{ -5p=gO  
 RegisterHotkey(); G8QJM0VpS  
} GPP~*+n  
>+u5%5-wr  
BOOL CCaptureDlg::RegisterHotkey() RK'3b/T  
{ m oFK/5cJ  
 UpdateData(); 5PKv@Mk  
 UCHAR mask=0; =_%:9FnQ0  
 UCHAR key=0; wIx Lr{  
 if(m_bControl) yu#Jw  
  mask|=4; C1p |.L?m  
 if(m_bAlt) Q;m .m2  
  mask|=2; x18ei@c  
 if(m_bShift) b44H2A .  
  mask|=1; >P\T nb"Q\  
  key=Key_Table[m_Key.GetCurSel()]; FX}<F0([?  
 if(bRegistered){ 8x58sOR=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); b ";#qVv C  
  bRegistered=FALSE; 8C,?Ai<ro  
 } "kP.Kx!  
 cMask=mask; L2{tof  
 cKey=key; GgA =EdJn  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L4Nk+R;  
 return bRegistered; zG [-n.  
} 'G-VhvM v  
.vG6\U7  
  四、小结 Bq R;d  
l,6="5t  
  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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