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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: |&h!#Q{7l  
  [}}oHm3&  
  一、实现方法 !W{|7Es?.  
|4x&f!%m  
  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: zxTm`Dh;[  
\d]&}`'4{f  
#pragma data_seg("shareddata") U~!97,|ic  
HHOOK hHook =NULL; //钩子句柄  FxD\F  
UINT nHookCount =0; //挂接的程序数目 uWvl<{2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 nakhepLN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u A*Op45  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N{L]H _=  
static int KeyCount =0; E&GUg/d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5rfGMk <  
#pragma data_seg() JrYpZ.Nh  
$ bD 3  
  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。 ;x| 4Tm  
 Js'COO  
  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: l?Bv9k.^?  
"JbFbcj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :G$NQ* (z  
cKey,UCHAR cMask) l{_>?]S5  
{ Pg|q{fc  
 BOOL bAdded=FALSE; ;{j:5+'  
 for(int index=0;index<MAX_KEY;index++){ K\,&wU  
  if(hCallWnd[index]==0){ ex&&7$CXc  
   hCallWnd[index]=hWnd; MoO jM&9  
   HotKey[index]=cKey; laKMQLtv  
   HotKeyMask[index]=cMask; 4VD'<`R[  
   bAdded=TRUE; ezC55nm  
   KeyCount++; eNi.d;8F  
   break; %ktU 51o  
  } jFbz:aUF  
 } Eki7bT@/  
 return bAdded; W~Eq_J?I  
} nYTI\f/8v  
//删除热键 =r:D]?8oC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H2p1gb#  
{ %~ZOQ%c1  
 BOOL bRemoved=FALSE; S'B7C>i`#N  
 for(int index=0;index<MAX_KEY;index++){ V92e#AR  
  if(hCallWnd[index]==hWnd){ m9.QGX\]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (y=P-nm  
    hCallWnd[index]=NULL; 6n45]?  
    HotKey[index]=0; \Vr(P>  
    HotKeyMask[index]=0; L}lc=\  
    bRemoved=TRUE; /N{xFt/?  
    KeyCount--; eWW\m[k]}  
    break; oIQor%z  
   } ~Se/uL;*  
  } FwmE1,  
 } on\0i{0l8  
 return bRemoved; T1\.~]-msb  
} >eWHPO  
\ bd? `."  
a~:'OW:Q  
  DLL中的钩子函数如下: H:a(&Zb  
[ wr0TbtV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Xp4pN{he  
{ &*T57tE  
 BOOL bProcessed=FALSE; v|CRiwx  
 if(HC_ACTION==nCode) s:i$s")  
 { (B7M*e  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /J wQ5  
   switch(wParam) '~<D[](/F  
   {  |JnJ=@-y  
    case VK_MENU: *:_ xy{m\  
     MaskBits&=~ALTBIT; vAHJP$x  
     break; |A[Le ;,  
    case VK_CONTROL: -8#Of)W  
     MaskBits&=~CTRLBIT; ;UArDwH  
     break; OAc+LdT  
    case VK_SHIFT: r }pYm'e  
     MaskBits&=~SHIFTBIT; pc:~_6S  
     break; cuW$%$ F  
    default: //judge the key and send message rP^2MH"  
     break; zG+oZ  
   } kYmkKl_  
   for(int index=0;index<MAX_KEY;index++){ zl4Iq+5~6Q  
    if(hCallWnd[index]==NULL) W5HC7o\4  
     continue; <G}>Gk8x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '!b1~+PV  
    { Nq9@^ E-{M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KZsSTB6J  
     bProcessed=TRUE; {CYFM[V  
    } yLipuMNV  
   } $l7 <j_C  
  } *=UEx0_!q  
  else if((lParam&0xc000ffff)==1){ //有键按下 OiJ1&Fz(  
   switch(wParam) s-3vp   
   { mst-:F[h  
    case VK_MENU: !1-:1Whz8  
     MaskBits|=ALTBIT; '<4/Md[  
     break; FJ}/g ?  
    case VK_CONTROL: x_s9DkX  
     MaskBits|=CTRLBIT; [;83 IoU}  
     break; `>g: :  
    case VK_SHIFT: P)7SK&]r;=  
     MaskBits|=SHIFTBIT; cOxF.(L  
     break; gR?=z}`@p  
    default: //judge the key and send message 305()  
     break; jaFBz&P/#  
   } NcwZ_*sqj  
   for(int index=0;index<MAX_KEY;index++){ W7_X=>l  
    if(hCallWnd[index]==NULL) "  q0lh  
     continue; j2k,)MHu!x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QUH USDT  
    { <t.yn\G-w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m!tB;:6  
     bProcessed=TRUE; Go= MG:`  
    } 3l-8TR  
   } <;=?~QK%-  
  } W(9-XlYKE  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =M*31>"I0  
   for(int index=0;index<MAX_KEY;index++){ E}b" qOV  
    if(hCallWnd[index]==NULL) 3.xsCcmP  
     continue; qVx4 t"%L>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rMdOE&5G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tF O27z@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 wHEt;rc(  
   } ![0\m2~iv  
  } OLXG0@  
 } ^R! qxSj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K\,)9:`t  
} dE%rQE7'  
?WKFDL'_0j  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: L^Fni~  
=j#uH`jgW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j[F\f>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LeF Z%y)F  
Z[[q W f  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: )4bBR@QM  
s%1O}X$c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qm{(.b^  
{ 4703\ HK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) v8 I&~_b  
 { z)#I"$!d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Vof[yL `  
  SaveBmp(); [h {zT)[  
  return FALSE; V<*PaS..  
 } |~Z.l  
 …… //其它处理及默认处理 )CD4k:bm  
} (1^AzE%U+Z  
3-`IMN n!  
; {iX_%  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 y U =) g  
TMpV .iH  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 1I{vB eMj  
|Rd?s0u  
  二、编程步骤 _)"-zbh}{  
SDwTGQ/0  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ^KM' O8  
-Wd2FD^x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &CpxD."8x  
G%jgr"]\z  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Hbn%CdDk1  
nm`[\3R  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ~k^rIjR  
(y *7 g f  
  5、 添加代码,编译运行程序。 :k*'M U}  
Ub2t7MU  
三、程序代码 &)zNu  
HIsIW%B  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jhgS@g=@ZC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A<fKO <d  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'y[74?1  
#if _MSC_VER > 1000 ($pNOG H  
#pragma once ;|}N\[fk%]  
#endif // _MSC_VER > 1000 K!Te*?b  
#ifndef __AFXWIN_H__ 2Tec#eYe  
#error include 'stdafx.h' before including this file for PCH L-? ?%_=  
#endif zkt`7Pg;J  
#include "resource.h" // main symbols v[{g "C  
class CHookApp : public CWinApp }E0~'  
{ *:gx1wd  
 public: t~]n"zgovz  
  CHookApp(); rofj&{w  
  // Overrides `u$  Rd  
  // ClassWizard generated virtual function overrides wI8  
  //{{AFX_VIRTUAL(CHookApp) b 5<&hN4g  
 public: /Jj7 +?  
  virtual BOOL InitInstance(); c!*yxzs\  
  virtual int ExitInstance(); }Z#KPI8\Q  
  //}}AFX_VIRTUAL 1y'8bt~7Pf  
  //{{AFX_MSG(CHookApp) C~-x637/  
  // NOTE - the ClassWizard will add and remove member functions here. ]9qY(m  
  // DO NOT EDIT what you see in these blocks of generated code ! js;p7wi  
  //}}AFX_MSG o@:${> jw  
  DECLARE_MESSAGE_MAP() nWb*u  
}; @6h ,#8#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); nsn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gR1vUad7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,.DTJ7H+  
BOOL InitHotkey(); E:vgG|??  
BOOL UnInit(); )Q= EmZbJz  
#endif [$M=+YRHMW  
K)b@,/5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K</EVt,U~  
#include "stdafx.h" #N Qpr  
#include "hook.h" ;E:vsVK  
#include <windowsx.h> &n$kVNE  
#ifdef _DEBUG Iue}AGxu:{  
#define new DEBUG_NEW nilis-Bk_  
#undef THIS_FILE I]Ev6>=;  
static char THIS_FILE[] = __FILE__; ]Q0m]OaT  
#endif sjGy=d{:oL  
#define MAX_KEY 100 v z6No%8X  
#define CTRLBIT 0x04 4fauI%kc  
#define ALTBIT 0x02 }uP`=T!"8  
#define SHIFTBIT 0x01 " GRR,7A  
#pragma data_seg("shareddata") YYNh| 2  
HHOOK hHook =NULL; bUvVt3cm  
UINT nHookCount =0; Z5/*i un  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey rebnV&-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT e~oh%l^C72  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <<'%2q5  
static int KeyCount =0; BOt1J_;(rO  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift eJbZA&:  
#pragma data_seg() ) XCG4-1  
HINSTANCE hins; `]~1pc  
void VerifyWindow(); %#t*3[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9*~bAgkWI  
//{{AFX_MSG_MAP(CHookApp) I]GGmN  
// NOTE - the ClassWizard will add and remove mapping macros here. !0-KB#  
// DO NOT EDIT what you see in these blocks of generated code! E'-lpE  
//}}AFX_MSG_MAP j<NZ4Rf  
END_MESSAGE_MAP() 0JT"Pv_  
\k4tYL5  
CHookApp::CHookApp() JuW"4R  
{ Gh%R4)}  
 // TODO: add construction code here, u ,R R|/@  
 // Place all significant initialization in InitInstance 5 w-Pq&q  
} $8>kk  
F $/7X~*  
CHookApp theApp; f \ E9u}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B]2m(0Y>>v  
{ H 48YX(HI  
 BOOL bProcessed=FALSE; Xwp6]lx  
 if(HC_ACTION==nCode) m^!Kthq  
 { ,J6t 1V  
  if((lParam&0xc0000000)==0xc0000000){// Key up YCl&}/.pA  
   switch(wParam) E)3Ah!  
   { e5AZU7%.  
    case VK_MENU: \LG0   
     MaskBits&=~ALTBIT; |N5r_V  
     break; ~ =GwNo_  
    case VK_CONTROL: P2Jo^WS  
     MaskBits&=~CTRLBIT; RGgePeaw  
     break; joz0D!-"#  
    case VK_SHIFT: ^F)t>K$0m  
     MaskBits&=~SHIFTBIT; Mz7qC3Z  
     break; knn9s0'Q  
    default: //judge the key and send message Ab #}BHI  
     break; v6U Gr4  
   } *{:Zdg'~E  
   for(int index=0;index<MAX_KEY;index++){ (H^)wDb  
    if(hCallWnd[index]==NULL) shgZru  
     continue; ~6A;H$dr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o9rZ&Q<  
    { n'To:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "D,}|  
     bProcessed=TRUE; ]z O6ESH  
    } WA6reZ  
   } \G0YLV~>P  
  } oeYUsnsbi  
  else if((lParam&0xc000ffff)==1){ //Key down A^c  (  
   switch(wParam) `]`S"W7&  
   { U?%T~!  
    case VK_MENU: >*MGF=.QG  
     MaskBits|=ALTBIT; HV&i! M@T  
     break; U5 ia|V  
    case VK_CONTROL: cG"wj$'w  
     MaskBits|=CTRLBIT; *(s0X[-  
     break; 00B,1Q HP  
    case VK_SHIFT: 82)%`$yZw[  
     MaskBits|=SHIFTBIT; e'yw8U5E/  
     break; g@'2 :'\  
    default: //judge the key and send message DH7]TRCMZ)  
     break; tmd{G x}c  
   } C{:U<q  
   for(int index=0;index<MAX_KEY;index++) q`VkA \  
   { j[,XJ,5=  
    if(hCallWnd[index]==NULL) I5*<J n  
     continue; m\oxS;fxWi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;m=k FZ?  
    { e45)t}'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "8p<NsU   
     bProcessed=TRUE; >Hu3Guik]  
    } B)*1[Jf{4  
   } :9DyABK=Cv  
  } J`4V\D}n  
  if(!bProcessed){ ?bH`  
   for(int index=0;index<MAX_KEY;index++){ Mp QsM-iW  
    if(hCallWnd[index]==NULL) Dz,|sHCmk  
     continue; j0^1BVcj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZkWMo= vL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [b+B"f6  
   } 0Bt>JbGs4  
  } eiCmd =O7  
 } $O&N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9?q ^yy  
} nA(5p?D+YB  
Y <`X$  
BOOL InitHotkey() ~g9~D}48k'  
{ 4k9$' k  
 if(hHook!=NULL){ p"7]zq]'  
  nHookCount++; O=vD6@QI  
  return TRUE; 6i;q=N$'  
 } PM i.)%++  
 else {Mb2X^@7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bXvriQ.UH  
  if(hHook!=NULL) EERCb%M 8Z  
   nHookCount++; !UR3`Xk  
  return (hHook!=NULL); Y(] W+k<  
} #)#J`s1R  
BOOL UnInit() X(O:y^sX}  
{ .}GOHW)}  
 if(nHookCount>1){ ]4/C19Fe!  
  nHookCount--; IB$i ^  
  return TRUE; 7^V`B^Vu  
 } DR @yd,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); s?"\+b  
 if(unhooked==TRUE){ k0&FUO  
  nHookCount=0; S}VN(g  
  hHook=NULL;  '[HBKn$`  
 } ~# \{'<  
 return unhooked;  Ci 'V  
} 7xM4=\~OG  
:]4s;q:m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IA Ws}xIly  
{ k& M~yb  
 BOOL bAdded=FALSE; XI:+EeM?  
 for(int index=0;index<MAX_KEY;index++){ JC`;hY  
  if(hCallWnd[index]==0){ $> ;|  
   hCallWnd[index]=hWnd; s1R#X~d  
   HotKey[index]=cKey; /l$fQ:l  
   HotKeyMask[index]=cMask; d}  5  
   bAdded=TRUE; A#{I- *D[  
   KeyCount++; BUdO:fr  
   break; } @ [!%hE  
  } AQtOTT$  
 } 2kOaKH[(q  
 return bAdded;  k{'<J(Hb  
} OJ7 Uh_;/  
O 3?^P"C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Rqbz3h~  
{ [?=DPE%  
 BOOL bRemoved=FALSE; XZQ-Ig18  
 for(int index=0;index<MAX_KEY;index++){ m^zD']  
  if(hCallWnd[index]==hWnd){ ;pS+S0U   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?&!!(dWFH  
    hCallWnd[index]=NULL; ++UxzUd  
    HotKey[index]=0; FRL;fF  
    HotKeyMask[index]=0; txm6[Io  
    bRemoved=TRUE; 'f0R/6h\3s  
    KeyCount--; gV$0J?Pr.  
    break; JvEW0-B^l,  
   } 3UF^Ff<wo  
  } EuA352x  
 } ?9 W2ax-4  
 return bRemoved; eoFG$X/PO  
} dNCd-ep  
's5H_ah  
void VerifyWindow() K47.zu  
{ ,<C~DSAyZ  
 for(int i=0;i<MAX_KEY;i++){ [vz2< genn  
  if(hCallWnd!=NULL){ ?)[=>Kp  
   if(!IsWindow(hCallWnd)){ l: kW|  
    hCallWnd=NULL; B qINU  
    HotKey=0; w11L@t[5W8  
    HotKeyMask=0; CKSs(-hkJ  
    KeyCount--; ks69Z|D  
   } 1d842pt  
  } <;@E .I\N  
 } [h_d1\ Cr  
} i-#Dc (9  
foBF]7Bz?  
BOOL CHookApp::InitInstance() ?=1i:h  
{ R&:Qy7"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); IGo5b-ds  
 hins=AfxGetInstanceHandle(); :o87<) _F  
 InitHotkey(); E(z|LS*3  
 return CWinApp::InitInstance(); %tPy]{S..  
}  ;5  
I)9 ,  
int CHookApp::ExitInstance() h#dfhcU>  
{ 0W_u"UY$c  
 VerifyWindow(); b7">IzAe  
 UnInit(); 5|`./+Ghk  
 return CWinApp::ExitInstance(); -G#m'W&  
} G)f!AuN=  
F7/%,vf  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7AqbfLO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C1qlB8(Wh>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g $^Yv4  
#if _MSC_VER > 1000 yigq#h^  
#pragma once .81 ~ K[  
#endif // _MSC_VER > 1000 %h;1}SFl0  
cxFyN ;7  
class CCaptureDlg : public CDialog ]US!3R^  
{ - (q7"h  
 // Construction OB^j b8  
 public: &Z9rQH81f>  
  BOOL bTray; SLH;iqPT  
  BOOL bRegistered; ~fzuz'"^  
  BOOL RegisterHotkey(); /)dyAX(  
  UCHAR cKey; eOfVBF<C2  
  UCHAR cMask; L. S/Mv  
  void DeleteIcon(); *iyc,f^w  
  void AddIcon(); Df]*S  
  UINT nCount; tWQ$`<h  
  void SaveBmp();  H =&K_  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |@f\[v9`  
  // Dialog Data %WX^']p  
  //{{AFX_DATA(CCaptureDlg) Zw<<p|{)<  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6TXTJ]er  
  CComboBox m_Key; K!2%8Ej,J  
  BOOL m_bControl; Ysw&J}6e  
  BOOL m_bAlt; g&8-X?^Q  
  BOOL m_bShift; PeLzZ'$D  
  CString m_Path; /#q6.du  
  CString m_Number; afu!.}4Ct  
  //}}AFX_DATA r029E-  
  // ClassWizard generated virtual function overrides 6['o^>\}f  
  //{{AFX_VIRTUAL(CCaptureDlg) MlW*Tugg  
 public: 8KKhD$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?N@[R];  
 protected: YTr+"\CkA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S&D8Rao5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); cJM.Q_I}Y  
  //}}AFX_VIRTUAL ^f,%dM=i=  
  // Implementation 9g.5:  
 protected: "3_GFq  
  HICON m_hIcon; T#[#w*w/  
  // Generated message map functions s k3 AwG;A  
  //{{AFX_MSG(CCaptureDlg) ~]'yUd1gSZ  
  virtual BOOL OnInitDialog(); [N<rPHT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .SNg2.  
  afx_msg void OnPaint(); :sA UV79M  
  afx_msg HCURSOR OnQueryDragIcon(); .kgt? r  
  virtual void OnCancel(); 9o3?  
  afx_msg void OnAbout(); GLMpWD`Wo  
  afx_msg void OnBrowse(); Dz8aJ6g  
  afx_msg void OnChange(); tX,x%(  
 //}}AFX_MSG fX>y^s?y  
 DECLARE_MESSAGE_MAP() ToD_9i }6  
}; g0-rQA  
#endif )l`VE_(|  
0ZZ Wj%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \eRct_  
#include "stdafx.h" QFgKEUNgl  
#include "Capture.h" I8YCXh  
#include "CaptureDlg.h" .nEiYS|T  
#include <windowsx.h>  k)W&ZY  
#pragma comment(lib,"hook.lib") Q8.LlE999  
#ifdef _DEBUG k dhwnO  
#define new DEBUG_NEW dQO 5  
#undef THIS_FILE U\-R'Z>M  
static char THIS_FILE[] = __FILE__; rZ2cC#  
#endif _6g(C_m'T?  
#define IDM_SHELL WM_USER+1  s=556  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Py?Q::  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Lg|d[*;'7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /w2-Pgm-[\  
class CAboutDlg : public CDialog ,lFp4 C  
{ m1xR uj]  
 public: 'u d[#@2  
  CAboutDlg(); #Jr4LQ@A9  
  // Dialog Data O{Z${TC[  
  //{{AFX_DATA(CAboutDlg) 4=N(@mS  
  enum { IDD = IDD_ABOUTBOX }; Yb1Q6[!  
  //}}AFX_DATA a>Zp?*9  
  // ClassWizard generated virtual function overrides )lq+Gv[%F  
  //{{AFX_VIRTUAL(CAboutDlg) >2X-98,  
 protected: IaU%L6Q]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #7/39zTK  
  //}}AFX_VIRTUAL BO%'/2eV  
  // Implementation -=ZDfM  
 protected: t+{vb S0  
  //{{AFX_MSG(CAboutDlg) '|<S`,'#hg  
  //}}AFX_MSG &:1q3 gDm  
  DECLARE_MESSAGE_MAP() usC$NVdm  
}; '}"&JO~vPj  
<y&&{*KW8m  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ys&)5j-  
{ ;k ,@^f8  
 //{{AFX_DATA_INIT(CAboutDlg) ? PpS4Rd  
 //}}AFX_DATA_INIT e*U6^Xex  
} s'$2 }K  
R'" c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (L(n%  
{ 8(L6I%k*  
 CDialog::DoDataExchange(pDX); jx2{kK  
 //{{AFX_DATA_MAP(CAboutDlg) 14 (sp  
 //}}AFX_DATA_MAP @7KG0<]h  
} 8)ng> l  
?GW}:'z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;~'&m  
 //{{AFX_MSG_MAP(CAboutDlg) vhcp[=e :  
 // No message handlers M}Xf<:g)  
 //}}AFX_MSG_MAP tBX71d T  
END_MESSAGE_MAP() B-PX/Q  
5L_`Fw\l  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v G9>e&Be  
: CDialog(CCaptureDlg::IDD, pParent) 7R# }AQ   
{ HxcL3Bh$~}  
 //{{AFX_DATA_INIT(CCaptureDlg) M>}_2G]#F  
  m_bControl = FALSE; [^^Pl:+  
  m_bAlt = FALSE; vu#ZLq  
  m_bShift = FALSE; +w"?q'SnF  
  m_Path = _T("c:\\"); oYt 34@{?  
  m_Number = _T("0 picture captured."); C\B4Uu6q  
  nCount=0; j-.Y!$a%6  
  bRegistered=FALSE; %%zlqd"0  
  bTray=FALSE; e[0"x. gu  
 //}}AFX_DATA_INIT `csZ*$7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ga(k2Q;y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *ZxurbX#  
} K<kl2#  
G=SMz+z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 76KNgV)3  
{ ={+8jQqi1  
 CDialog::DoDataExchange(pDX); 9C0#K\  
 //{{AFX_DATA_MAP(CCaptureDlg) {8oGWQgrj  
  DDX_Control(pDX, IDC_KEY, m_Key); F\|4zM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =%7s0l3z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P{yb%@I~J  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ivyaGAF}+o  
  DDX_Text(pDX, IDC_PATH, m_Path); _x|.\j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3!vzkBr  
 //}}AFX_DATA_MAP ?~!9\dek,  
} n?;rWq"  
xu%eg]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) tC5-^5[y  
//{{AFX_MSG_MAP(CCaptureDlg) z^z`{B  
 ON_WM_SYSCOMMAND() ;{q*  
 ON_WM_PAINT() PB?2{Cj  
 ON_WM_QUERYDRAGICON() c&FOt  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !a-B=pn!]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0!7p5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ! Dj2/][  
//}}AFX_MSG_MAP Poa&htxe1  
END_MESSAGE_MAP() py+\e" s  
S(?A3 H  
BOOL CCaptureDlg::OnInitDialog() [[zN Aq)"  
{ _SJ:|I  
 CDialog::OnInitDialog(); u6 Lx3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); HD/!J9&  
 ASSERT(IDM_ABOUTBOX < 0xF000); %OHZOs  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %.?V\l  
 if (pSysMenu != NULL) ??U/Qi180  
 { ,&qC R sw  
  CString strAboutMenu; o:fe`#t  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !8| }-eFY  
  if (!strAboutMenu.IsEmpty()) 7(N+'8  
  { <aDZ{T%  
   pSysMenu->AppendMenu(MF_SEPARATOR); G\TO ]c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 75lh07  
  } ^gZ,A]  
 } d7 H*F  
 SetIcon(m_hIcon, TRUE); // Set big icon /XEW]/4  
 SetIcon(m_hIcon, FALSE); // Set small icon JXYZ5&[  
 m_Key.SetCurSel(0); > pP&/  
 RegisterHotkey(); GNe^ ~  
 CMenu* pMenu=GetSystemMenu(FALSE); ,"XiI$Le  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); O#^H.B  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d]" 4aS  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0GXY2+p}S  
 return TRUE; // return TRUE unless you set the focus to a control .V?[<}OJn  
} 8/BMFRJ  
^W,5A;*3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (6Z^0GL  
{ +E_yEH7_)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {svo!pN:  
 {  mPk'a  
  CAboutDlg dlgAbout; XW" 0:}`J  
  dlgAbout.DoModal(); s&(;  
 } y,3ZdY"  
 else IhYR4?e  
 { JcA+ztPU  
  CDialog::OnSysCommand(nID, lParam); Np/\ }J&IF  
 } Zo yO[#  
} V L$ T  
$ VP1(C  
void CCaptureDlg::OnPaint() fzQR0  
{ $R1I(sJ  
 if (IsIconic()) ,0 q1Id  
 { ]MosiMJF  
  CPaintDC dc(this); // device context for painting h0@a"DqK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f$ xp74hw3  
  // Center icon in client rectangle d6YXITL)\>  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2_+>a"8Y  
  int cyIcon = GetSystemMetrics(SM_CYICON); h%Nd89//  
  CRect rect; ,7]hjf_h  
  GetClientRect(&rect); A>1$?A8Q  
  int x = (rect.Width() - cxIcon + 1) / 2; O9(z"c  
  int y = (rect.Height() - cyIcon + 1) / 2; I}3F'}JV<  
  // Draw the icon g}xL7bTlI>  
  dc.DrawIcon(x, y, m_hIcon); N+rU|iMa.  
 } '#Au~5  
 else =I@t%Y  
 { r(46jV.sD:  
  CDialog::OnPaint(); L2ydyXIsd  
 } _y_}/  
} {YzCgf  
f 7lj,GAZ  
HCURSOR CCaptureDlg::OnQueryDragIcon() yXJ25Axb  
{ DfD >hf/  
 return (HCURSOR) m_hIcon; 2!Dz9m3  
} E,}{iqAb  
7|DG1p9C  
void CCaptureDlg::OnCancel() v{VF>qE P  
{ og5VB  
 if(bTray) jTvcKm|q  
  DeleteIcon(); %+N]$Q  
  CDialog::OnCancel(); Pc`d]*BYi  
} )Y7H@e\1  
t?4H9~iH  
void CCaptureDlg::OnAbout() 'z(Y9%+a  
{ &uK(. @  
 CAboutDlg dlg; 6*q1%rs:w  
 dlg.DoModal(); ;7QXs39S  
} jtP*C_Scv/  
:ZV |8xI  
void CCaptureDlg::OnBrowse() d +D~NA[M  
{ oLT#'42+H  
 CString str; L7-BuW}&  
 BROWSEINFO bi; 1 :p'  
 char name[MAX_PATH]; ew~Z/ A   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >v.f H6P,}  
 bi.hwndOwner=GetSafeHwnd(); P1Hab2%+  
 bi.pszDisplayName=name; CO='[1"_5  
 bi.lpszTitle="Select folder"; g Ed A hfx  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e0zP LU}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z8 #nu  
 if(idl==NULL) 7~e,"^>T  
  return; s5nw<V9$]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -3{Q`@F  
 str.ReleaseBuffer(); )!2@v@SQ  
 m_Path=str; kGYpJg9=  
 if(str.GetAt(str.GetLength()-1)!='\\') 0Z1ksfLU  
  m_Path+="\\";  ES~b f  
 UpdateData(FALSE); u}[ a  
} q!y.cyL  
ga 5Q  
void CCaptureDlg::SaveBmp() 9\_AB.Z:  
{ /?'~`4!(  
 CDC dc; K ze?@*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fp' '+R[   
 CBitmap bm; {aY) Qv}  
 int Width=GetSystemMetrics(SM_CXSCREEN); l{{,D57J  
 int Height=GetSystemMetrics(SM_CYSCREEN); {dpC;jsW1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w}xA@JgQ%  
 CDC tdc; @7twe;07r  
 tdc.CreateCompatibleDC(&dc); -tj#BEC[H(  
 CBitmap*pOld=tdc.SelectObject(&bm); k$3pmy*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); JU?;Kq9R  
 tdc.SelectObject(pOld); nqj(V  
 BITMAP btm; IzpE|8l  
 bm.GetBitmap(&btm); EZ)b E9  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; An. A1y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xE:jcA d$}  
 BITMAPINFOHEADER bih; 1=R$ RI  
 bih.biBitCount=btm.bmBitsPixel; 9zwD%3Ufn  
 bih.biClrImportant=0; 4X+xh|R:U  
 bih.biClrUsed=0; TEz;:*,CG  
 bih.biCompression=0; atTR6%!6  
 bih.biHeight=btm.bmHeight; 41X`.  
 bih.biPlanes=1; qVC+q8  
 bih.biSize=sizeof(BITMAPINFOHEADER); E>bkEm  
 bih.biSizeImage=size; 5whW>T  
 bih.biWidth=btm.bmWidth; pU7;!u:c4%  
 bih.biXPelsPerMeter=0; lL)f-8DX  
 bih.biYPelsPerMeter=0; \sNgs#{7E7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /ox7$|Jyr  
 static int filecount=0; 5Z>a}s_i  
 CString name; $6rm;UH  
 name.Format("pict%04d.bmp",filecount++); W%L'nR~w$  
 name=m_Path+name; wQ+pVu?6_  
 BITMAPFILEHEADER bfh; rl|'.~mc  
 bfh.bfReserved1=bfh.bfReserved2=0; k&$ov  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d&+]@ Ii  
 bfh.bfSize=54+size; z% 8`F%2  
 bfh.bfOffBits=54; d%7?913  
 CFile bf; COh#/-`\1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q\EYsN</;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !mlfG "FE  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hVz yvpw  
  bf.WriteHuge(lpData,size); @_ %RQO_X  
  bf.Close(); cMY}Y [2c  
  nCount++; rN}pi@  
 } & kC  
 GlobalFreePtr(lpData); /~NX<Ye&  
 if(nCount==1) A6z ,6v6  
  m_Number.Format("%d picture captured.",nCount);  d$$5&a  
 else q} e#L6cM  
  m_Number.Format("%d pictures captured.",nCount); >(RkoExO/  
  UpdateData(FALSE); _ $F=A  
} xX<f4H\'  
"\o#YC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w6vbYPCN  
{ KuJ)alD;1  
 if(pMsg -> message == WM_KEYDOWN) }4C_r'd6  
 { 1-y8Hy_a2  
  if(pMsg -> wParam == VK_ESCAPE) *Jsb~wta  
   return TRUE; w%])  
  if(pMsg -> wParam == VK_RETURN) X:W\EeH  
   return TRUE; ;J W ]b]  
 } Hu|Tj<S  
 return CDialog::PreTranslateMessage(pMsg); vb>F)X?b_  
} Ae>+Fcv  
poQ_r <I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^#R`Uptib  
{ +f/ I>9G  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b}qfOgd5  
  SaveBmp(); ~J].~^[  
  return FALSE; y0xBNhev  
} >=N-P< %  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DT]4C!dh  
 CMenu pop; RL` E}:V  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8jz>^.-o  
 CMenu*pMenu=pop.GetSubMenu(0); qyRN0ZB"A^  
 pMenu->SetDefaultItem(ID_EXITICON); yj:@Fg-3g  
 CPoint pt; BM!ZdoKrKt  
 GetCursorPos(&pt); Y<T0yl?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); </25J((  
 if(id==ID_EXITICON) 'yiv.<4  
  DeleteIcon(); D6VdgU|  
 else if(id==ID_EXIT) E)*ht;u  
  OnCancel(); &wQ;J)13  
 return FALSE; edL2ax  
} Ze0qRLuH!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v2x+_K}J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }b1G21Dc!  
 AddIcon(); !>9s  
 return res; pT,8E(*l2  
} 9nAP%MA`  
NJBSVC b  
void CCaptureDlg::AddIcon() irlFB#..  
{ &PC6C<<f  
 NOTIFYICONDATA data; }d%CZnY&7  
 data.cbSize=sizeof(NOTIFYICONDATA); V lx.C~WYn  
 CString tip; }TTghE!  
 tip.LoadString(IDS_ICONTIP); 6_`Bo%  
 data.hIcon=GetIcon(0); %"{P?V<-V  
 data.hWnd=GetSafeHwnd(); mqZK1<r  
 strcpy(data.szTip,tip); hV@ N -u^  
 data.uCallbackMessage=IDM_SHELL; ZUI6VM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qx#M6\L!  
 data.uID=98; B{/og*xd*1  
 Shell_NotifyIcon(NIM_ADD,&data); a"@f< wU~  
 ShowWindow(SW_HIDE); 0Md>-H;ZY  
 bTray=TRUE; _$UJ'W})/  
} *}]#E$  
;.4y@?B  
void CCaptureDlg::DeleteIcon() 6Q:Wo)^!  
{ q(n"r0)=  
 NOTIFYICONDATA data; `NtW+v  
 data.cbSize=sizeof(NOTIFYICONDATA); vEI{AmogRx  
 data.hWnd=GetSafeHwnd(); c0o]O[  
 data.uID=98; s*rR> D:  
 Shell_NotifyIcon(NIM_DELETE,&data); WOn53|GQK  
 ShowWindow(SW_SHOW); c'Z=uL<Rm  
 SetForegroundWindow(); WWp MuB_G  
 ShowWindow(SW_SHOWNORMAL); %_|KiW  
 bTray=FALSE; Hhtl~2t!0  
} y[b 8rv  
tdK&vqq  
void CCaptureDlg::OnChange()  bUcp8  
{ `}ak]Z_  
 RegisterHotkey(); ;a?<7LIx  
} uB)q1QQsqp  
 T7nI/y  
BOOL CCaptureDlg::RegisterHotkey() LzL)qdL  
{ Pg}QRCB@  
 UpdateData(); 1o&zA<+NY  
 UCHAR mask=0; xN*k&!1&  
 UCHAR key=0; $.D )Llcq  
 if(m_bControl) qWH^/o  
  mask|=4; i(% 2t(wf+  
 if(m_bAlt) 1 *' /B  
  mask|=2; g|Lbe4?  
 if(m_bShift) W.^zN'a  
  mask|=1; ~HIj+kN  
  key=Key_Table[m_Key.GetCurSel()]; 9\EW~OgTu  
 if(bRegistered){ A l?%[-u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9]v,3'QI  
  bRegistered=FALSE; <eXGtD  
 } bse`Xfg  
 cMask=mask; bD{tsxm[9  
 cKey=key; q0 }u%Yz  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =@d#@  
 return bRegistered; CcUF)$kz  
} ;i[JCNiS\  
2-@)'6"n  
  四、小结 Z5xQ -T`  
Tw';;euw  
  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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