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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: XGb*LY+Db6  
  85:KlBe%+  
  一、实现方法 "t)$4gERK  
7e:eL5f>~  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:  rrP_7D  
G S&I6  
#pragma data_seg("shareddata") b6NGhkr'\  
HHOOK hHook =NULL; //钩子句柄 %Y-5L;MI  
UINT nHookCount =0; //挂接的程序数目 HChlkj'7w0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Mc~L%5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (B0QBDj!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey e<$s~ UXv  
static int KeyCount =0; *cP(3n3]R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Yb\d(k$h  
#pragma data_seg() ] ^53Qbrv  
l T#WM]  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 VDFs.;:s  
v^dQ%+}7>  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: @TJ2 |_s6]  
j6WDh}#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR kgHZaQnD  
cKey,UCHAR cMask) _BoYy JQH  
{ \0n<6^y  
 BOOL bAdded=FALSE; >rXDLj-e  
 for(int index=0;index<MAX_KEY;index++){ 88KQ) NU  
  if(hCallWnd[index]==0){ ue1g(;  
   hCallWnd[index]=hWnd; ~gdnD4[G  
   HotKey[index]=cKey; zF@[S  
   HotKeyMask[index]=cMask; y!c<P,Lt3f  
   bAdded=TRUE; ;}H*|"z;!  
   KeyCount++; 9aBz%* xo  
   break; 39~te%;C7  
  } LP'~7FG  
 } Rn*@)5  
 return bAdded; !u;gGgQF  
} =I0J1Ob  
//删除热键 EXsVZg"#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !l5@L\   
{ XS$#\UQ  
 BOOL bRemoved=FALSE; >d(:XP6J  
 for(int index=0;index<MAX_KEY;index++){ PqMu2 e  
  if(hCallWnd[index]==hWnd){ _jb&=f8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qpjiQ,\:b  
    hCallWnd[index]=NULL; seVT| z  
    HotKey[index]=0; PJT$9f~3;.  
    HotKeyMask[index]=0; <v!jS=T  
    bRemoved=TRUE; cTQ._|M  
    KeyCount--; 7 lSR  
    break; '~VF*i^4  
   } %~:@}C%A  
  } WfHa  
 } `! xI!Y\  
 return bRemoved; |]~],  
} ,Jx.Kj.,  
?{P$|:ha  
;ojJXH~$}  
  DLL中的钩子函数如下: r4ljA@L  
A2!pbeG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }USOWsLSt  
{ biZ=TI2P,L  
 BOOL bProcessed=FALSE; 6~l+wu<$  
 if(HC_ACTION==nCode) 6tGF  
 { >)HKruSW.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 J!}\v=Rn  
   switch(wParam) 2FY]o~@  
   {  CzI s_/  
    case VK_MENU:  U02  
     MaskBits&=~ALTBIT; }~p%e2<  
     break; \E'z+0  
    case VK_CONTROL: %)Z,?DzZ  
     MaskBits&=~CTRLBIT; C~WWuju'  
     break; &Ez+4.srkh  
    case VK_SHIFT: 7uf5w0]  
     MaskBits&=~SHIFTBIT; [{>3"XJ'  
     break; F2{SC?U  
    default: //judge the key and send message uqD|j:~ =k  
     break; QQ=Kj%R  
   } sm{/S*3  
   for(int index=0;index<MAX_KEY;index++){ $1FnjL5u  
    if(hCallWnd[index]==NULL) QX42^]({;c  
     continue; BY9Z}/{j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 96S$Y~G# &  
    { 2PSkLS&IM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HA0F'k  
     bProcessed=TRUE; [E+J=L.l  
    } #guK&?Fye  
   } BSy{"K*M  
  } @NL37C  
  else if((lParam&0xc000ffff)==1){ //有键按下 |)br-?2  
   switch(wParam) o+L [o_er  
   { i(ZzE  
    case VK_MENU: hUX8j9N>  
     MaskBits|=ALTBIT; qO/3:-  
     break; bc NyB$S  
    case VK_CONTROL: `sA xk  
     MaskBits|=CTRLBIT; ^*+j7A.n  
     break; ~Ye nH  
    case VK_SHIFT: _~ 'MQ`P  
     MaskBits|=SHIFTBIT; HXX9D&c4R  
     break; &M tF  
    default: //judge the key and send message lANi$ :aE  
     break; v V;]?  
   } H0jbG;  
   for(int index=0;index<MAX_KEY;index++){ ko|M2\  
    if(hCallWnd[index]==NULL) gvPHB+#A  
     continue; eCWF0a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /q8B | (U  
    { C,%Dp0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tc{l?7P  
     bProcessed=TRUE; Y; iI =U  
    } e&E7_  
   } Vk2%yw>  
  } L,!\PV|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <WnIJum  
   for(int index=0;index<MAX_KEY;index++){ 0!RP7Sx  
    if(hCallWnd[index]==NULL) !T2{xmHKv$  
     continue; 4E_u.tJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t~)4f.F:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yE.st9m  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yMzy!b Ky  
   } j'Q0DF=GV  
  } K9Onjs% U  
 } OH@gwC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _00}O+GLM4  
} a8v\H8@X  
kw} E0uY  
  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: :fnJp9c  
%%I:L~c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \}%_FnP0ZU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sva-Sd8  
t=My=pG  
  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: 0M)\([W9&  
P)XR9&o':  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /x]^Cqe  
{ 9UV}`UM3V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) UtC<TBr  
 { g/WDAO?d  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3sIdwY)ZS_  
  SaveBmp(); 9V~hz (^  
  return FALSE; BHS@whj  
 } qx9; "Ut  
 …… //其它处理及默认处理  j=G  
} eu8a<  
SUIu.4Mz  
L_|iQwU%  
  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。 Z0O0Q=e\Y  
L]Xx-S  
  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。 k {vd1,HZ  
c6=XJvz  
  二、编程步骤 v-^<,|vm2f  
VKw.g@BY  
  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"; mey -Bn  
+fKV/tSWi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \zBZ$5 rE  
$P)-o?eer  
  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; &U CtyCz  
tUW^dGo.  
  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; ;Jb% 2?+=!  
.W$9nbly  
  5、 添加代码,编译运行程序。 :8hXkQ  
R?,v:S&i7;  
三、程序代码 }6 u)wF5  
k2_y84;D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *-.`Q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0LP0q9S:9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7l09  
#if _MSC_VER > 1000 m*h O@M  
#pragma once jsF5q~F  
#endif // _MSC_VER > 1000 DHyQ:0q  
#ifndef __AFXWIN_H__ wr(*RI"  
#error include 'stdafx.h' before including this file for PCH =Lb(N61  
#endif qlg.\H:W~  
#include "resource.h" // main symbols sFvYCRw /  
class CHookApp : public CWinApp 'PW/0k  
{ 1W-kZ(e  
 public: V?>&9D"m  
  CHookApp(); {w,<igh  
  // Overrides #,FXc~V  
  // ClassWizard generated virtual function overrides > PL}7f&:  
  //{{AFX_VIRTUAL(CHookApp) y5D3zqCG  
 public: C43I(.2g  
  virtual BOOL InitInstance(); OwgPgrV  
  virtual int ExitInstance(); s ya!VF]`  
  //}}AFX_VIRTUAL mi5bk>o  
  //{{AFX_MSG(CHookApp) 6/p9ag]  
  // NOTE - the ClassWizard will add and remove member functions here. E@l@f  
  // DO NOT EDIT what you see in these blocks of generated code ! 7fd,I%v  
  //}}AFX_MSG ZEpu5`  
  DECLARE_MESSAGE_MAP() BLt_(S?Z`  
}; ^vzXT>t-M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); MCIuP`sC|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9Uz2j$p7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Nr"GxezU+A  
BOOL InitHotkey(); t-iQaobF  
BOOL UnInit(); VP?Q$?a  
#endif  n$>_2v  
7 4(bo \  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *+2BZ ZwT  
#include "stdafx.h" _W,?_"[R=  
#include "hook.h" uKJo5%>  
#include <windowsx.h> vDR> Q&/K  
#ifdef _DEBUG :9q|<[Y^  
#define new DEBUG_NEW p_fsEY  
#undef THIS_FILE zP@\rZ@4  
static char THIS_FILE[] = __FILE__; &Ot9"Aq:  
#endif ?i!d00X  
#define MAX_KEY 100 Q&PEO%/D  
#define CTRLBIT 0x04 .#K\u![@N  
#define ALTBIT 0x02 &sXk!!85:  
#define SHIFTBIT 0x01  j~cG#t]  
#pragma data_seg("shareddata") N>g6KgX{K  
HHOOK hHook =NULL; j.V7`x  
UINT nHookCount =0; #k!;=\FV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O -p^S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT h ^w# I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9`@}KnvB?  
static int KeyCount =0; 5twG2p8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qA25P<  
#pragma data_seg() w2`JFxQ^x  
HINSTANCE hins; u)/i$N  
void VerifyWindow(); EU Oa8Z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) mVK^gJ3  
//{{AFX_MSG_MAP(CHookApp) K!-iDaVI  
// NOTE - the ClassWizard will add and remove mapping macros here. n^|7ycB'  
// DO NOT EDIT what you see in these blocks of generated code! +4 D#Ht 7  
//}}AFX_MSG_MAP ZKB27D_vg>  
END_MESSAGE_MAP() g`"_+x'  
)o&}i3~Q  
CHookApp::CHookApp() u2U+uD@yA  
{ 6}\J-A/  
 // TODO: add construction code here, $UdFm8&  
 // Place all significant initialization in InitInstance w'mn O'%  
} 5fp&!HnG  
H4M`^r@)'  
CHookApp theApp; <#T #+uO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /q"8sj/  
{ SuBUhzR  
 BOOL bProcessed=FALSE; @ "C P@^  
 if(HC_ACTION==nCode) G?:5L0g  
 { xp\6,Jyh  
  if((lParam&0xc0000000)==0xc0000000){// Key up V r T0S  
   switch(wParam) ,pdf$) XB  
   { #g1,U7vv8  
    case VK_MENU: !4$o*{9Lx:  
     MaskBits&=~ALTBIT; zWF[cf>'  
     break; F/df!I~  
    case VK_CONTROL: i[vOpg]J  
     MaskBits&=~CTRLBIT; X}&Y(kOT  
     break; id1gK(F8H  
    case VK_SHIFT: ZM57(D  
     MaskBits&=~SHIFTBIT; 4X>=UO``L  
     break; QKt{XB6Y  
    default: //judge the key and send message <2^ F'bQV  
     break; - KaU@t  
   } 88DMD"$B  
   for(int index=0;index<MAX_KEY;index++){ ^VjF W  
    if(hCallWnd[index]==NULL) -}H EV#ev  
     continue; M-C>I;a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |W|RX3D  
    { KFM)*Icg\8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^F|/\i   
     bProcessed=TRUE; !XF:.|  
    } ?T'a{ ~]R  
   } su~J:~q  
  } @ | (Tg  
  else if((lParam&0xc000ffff)==1){ //Key down FyllVrK  
   switch(wParam) m=^ihQ  
   { 1X#gHstD  
    case VK_MENU: D<bH RtP  
     MaskBits|=ALTBIT; K|rG&#1J  
     break;  U%tpNWB  
    case VK_CONTROL: kY~o3p<  
     MaskBits|=CTRLBIT; s{0c.M  
     break; ?!n0N\|i]  
    case VK_SHIFT: ?]58{O(?c  
     MaskBits|=SHIFTBIT; 7KV0g1GQ  
     break; T K Ec ^  
    default: //judge the key and send message m Wh   
     break; )"Dl,Fig:/  
   } wf,w%n  
   for(int index=0;index<MAX_KEY;index++) BPypjS0?8  
   { VP"C|j^I  
    if(hCallWnd[index]==NULL) $HFimU,V=0  
     continue; CVGQ<,KVW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SbD B[O%  
    { .^[{~#Pc*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p}yp!(l  
     bProcessed=TRUE; x I(X+d``  
    } .J2tm2]"EZ  
   } DG 6W ^  
  } T^ RYN  
  if(!bProcessed){ V7,;N@FL  
   for(int index=0;index<MAX_KEY;index++){ - D^v:aC  
    if(hCallWnd[index]==NULL) |SwW*C  
     continue; ac/<N%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /jd.<r=_I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _'U(q\ri  
   } 42.y.LtZ  
  } !sh>`AF  
 } ~L=? F  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k\}\>&Zqu  
} :<R"Kk@  
NFBhnNH+  
BOOL InitHotkey() A=\:b^\  
{ I{uwT5QT-  
 if(hHook!=NULL){ n]v,cfn/=<  
  nHookCount++; Cg];UB}k  
  return TRUE; 7H_*1_%ZQ  
 } Qjd<%!]+\  
 else 'E kuCL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [> LL  
  if(hHook!=NULL) h)sQ3B.}A  
   nHookCount++; rHD_sC*  
  return (hHook!=NULL); 1YvE/<6  
} {4HcecT  
BOOL UnInit() )~ghb"K  
{ rFG_CC2  
 if(nHookCount>1){ t4r%EP|Zt  
  nHookCount--; CP6xyXOlPB  
  return TRUE; 0z`-fQfK  
 } V-w{~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |&AZ95v   
 if(unhooked==TRUE){ 1'BC R  
  nHookCount=0; )LjW=;(b  
  hHook=NULL; uu;1B.[b  
 } k/2TvEV3=  
 return unhooked; Ae_:Kc6  
} ,p9>/)l  
j5bp)U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w ;xbQZ|+  
{ oS#PBql4  
 BOOL bAdded=FALSE; zF#:Uc`C5U  
 for(int index=0;index<MAX_KEY;index++){ 2rG$.cGN"  
  if(hCallWnd[index]==0){ Z:Y_{YAD  
   hCallWnd[index]=hWnd; 3\0,>L9ET@  
   HotKey[index]=cKey; >A ?,[p`<  
   HotKeyMask[index]=cMask; &a?k1R>  
   bAdded=TRUE; ,]_<8@R  
   KeyCount++; zL/r V<  
   break; $Lt'xW`8  
  } )6:1`&6  
 } }C<$q  
 return bAdded; V~"-\@  
} tu5T^"B qO  
9 1ndr@*|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F8d:7`lO@/  
{ K%WG[p\Eu  
 BOOL bRemoved=FALSE; VrnZrQj<  
 for(int index=0;index<MAX_KEY;index++){ f7oJ6'K  
  if(hCallWnd[index]==hWnd){ DW0N}>Gp*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pRGag~h|E  
    hCallWnd[index]=NULL; fO t?2Bh  
    HotKey[index]=0; w>TTu: 7  
    HotKeyMask[index]=0; ['Y"6[1  
    bRemoved=TRUE; in#lpDa[  
    KeyCount--; rIQ%X`Y  
    break; Fb\ E39  
   } J)._&O$  
  } OI^sd_gkZ  
 } 84A:Rd'k3)  
 return bRemoved; n'qWS/0U=  
} -xL^UcG0  
xt1Ug~5  
void VerifyWindow() lAJ P X  
{ bO+]1nZ.  
 for(int i=0;i<MAX_KEY;i++){ \t?rHB3"  
  if(hCallWnd!=NULL){ i>%A0.9  
   if(!IsWindow(hCallWnd)){ W=\45BJ  
    hCallWnd=NULL; hkl9 EVO)  
    HotKey=0; @!p0<&R@x  
    HotKeyMask=0; L*(`c cU  
    KeyCount--; IH3Nkpsg  
   } PM`iqn)@  
  } g+3_ $qIQ+  
 } vC!B}~RG  
} n<e1=L  
x,LY fy"0  
BOOL CHookApp::InitInstance() vq:?a  
{ 9NeHN@D)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (CInt_dBw~  
 hins=AfxGetInstanceHandle(); e5#?@}?  
 InitHotkey(); Y T'olk  
 return CWinApp::InitInstance(); 4)?s?+  
} {h0T_8L/  
lx:.9>  
int CHookApp::ExitInstance() *=X61`0  
{ :pvB}RYD  
 VerifyWindow(); Q PrP3DK  
 UnInit(); `wKd##v'@  
 return CWinApp::ExitInstance(); r7-H`%.  
} W0XfU`  
vOo-jUKs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]DjnzClx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) qW`DCZu  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {'sp8:$a  
#if _MSC_VER > 1000 oaG;i51!  
#pragma once 6G7+&g`  
#endif // _MSC_VER > 1000 ko ~D;M:  
?D;7ut$~  
class CCaptureDlg : public CDialog B["jndyr  
{ Tly*i"[&  
 // Construction LjCUkbzQF  
 public: HutQx  
  BOOL bTray; ^~^=$fz  
  BOOL bRegistered; $},_O8R  
  BOOL RegisterHotkey(); c!N#nt_<  
  UCHAR cKey; @6b4YV h  
  UCHAR cMask; kQD~v+u{`  
  void DeleteIcon(); ~DP5Qi  
  void AddIcon(); E8L\3V4  
  UINT nCount; ( 'Ha$O72  
  void SaveBmp(); BAojP1}+,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Zs2;VW4RW  
  // Dialog Data Zi{vEI]  
  //{{AFX_DATA(CCaptureDlg) NZz^*Ela  
  enum { IDD = IDD_CAPTURE_DIALOG }; yVWt%o/  
  CComboBox m_Key; ,*8)aZ1 k  
  BOOL m_bControl; u Au'2M,_  
  BOOL m_bAlt; o:`^1  
  BOOL m_bShift; r4Xaa<  
  CString m_Path; !uP8powO  
  CString m_Number; =!u]t &yv  
  //}}AFX_DATA 49= K]X  
  // ClassWizard generated virtual function overrides Ml6}47n  
  //{{AFX_VIRTUAL(CCaptureDlg) }Z)YK}_1  
 public: VFq7nV/O  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ? (M$r\\  
 protected: +V;d^&S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `NfwW:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iUq_vQ@} }  
  //}}AFX_VIRTUAL lib}dk  
  // Implementation }U?:al/m  
 protected: 6Ev+!!znu  
  HICON m_hIcon; BmaY&?  
  // Generated message map functions mQ3gp&d3W  
  //{{AFX_MSG(CCaptureDlg) .Hg{$SAC(w  
  virtual BOOL OnInitDialog(); |Xmzq X%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #'. '|z  
  afx_msg void OnPaint(); q8MyEoc:n  
  afx_msg HCURSOR OnQueryDragIcon(); 5?.!A 'zb  
  virtual void OnCancel(); m[v%Qe|~  
  afx_msg void OnAbout(); Y$_^f*sFn  
  afx_msg void OnBrowse(); KQ0f2?  
  afx_msg void OnChange(); 3zv0Nwb,  
 //}}AFX_MSG rpc;*t+z  
 DECLARE_MESSAGE_MAP() yji>vJHu  
}; XB a^ A  
#endif 3;88a!AA!  
Nz:p(X!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i!eY"|o  
#include "stdafx.h" 8%p+:6kP5  
#include "Capture.h" 3xgU=@!;  
#include "CaptureDlg.h" w$j6!z  
#include <windowsx.h> SeuDJxqopD  
#pragma comment(lib,"hook.lib") <pM6fI6BD  
#ifdef _DEBUG 2OjU3z<J  
#define new DEBUG_NEW 2fXwJG'  
#undef THIS_FILE 9%2h e)Yqc  
static char THIS_FILE[] = __FILE__; #mD_<@@  
#endif GC|V>| tz#  
#define IDM_SHELL WM_USER+1 k"E|E";B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G?!8T91;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u+c2 m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qDgy7kkQ  
class CAboutDlg : public CDialog ExF6y#Y G<  
{ ErFt5%FN.O  
 public: n8JM 0 U-  
  CAboutDlg(); wbI1~/  
  // Dialog Data HY;kV6g{P  
  //{{AFX_DATA(CAboutDlg) ?5F;4 oR2g  
  enum { IDD = IDD_ABOUTBOX }; 93 =?^  
  //}}AFX_DATA fcy4?SQ.<i  
  // ClassWizard generated virtual function overrides di7cCn  
  //{{AFX_VIRTUAL(CAboutDlg) K5z<n0X ~  
 protected: Pa"Kk9!o36  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g?*D)W U  
  //}}AFX_VIRTUAL At !@Rc  
  // Implementation A\v53AT  
 protected: 0QyL}y2  
  //{{AFX_MSG(CAboutDlg) OGO\u#  
  //}}AFX_MSG TaF;P GjVw  
  DECLARE_MESSAGE_MAP() S+*>""=  
}; 7Hj7b:3K&!  
40z1Qkmaey  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W$W w/mcl+  
{  SiJ{  
 //{{AFX_DATA_INIT(CAboutDlg) OLV3.~T  
 //}}AFX_DATA_INIT QZ[S, c^  
} "p+JME(  
x:h)\%Dg<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) A`"?~_pHC  
{ d(9-T@J  
 CDialog::DoDataExchange(pDX); 4vNH"72P  
 //{{AFX_DATA_MAP(CAboutDlg) /SyAjZ  
 //}}AFX_DATA_MAP jv6>7@<G  
} Z~[eG"6zI  
 ?$y/b}8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tY:,9eh7B  
 //{{AFX_MSG_MAP(CAboutDlg) h iK}&  
 // No message handlers F{_,IQ]U  
 //}}AFX_MSG_MAP b$- g"F  
END_MESSAGE_MAP() 5Zmc3&vRl  
BqDsf5}jpA  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) GkI{7GD:z  
: CDialog(CCaptureDlg::IDD, pParent) DyA1zwp}  
{ wWSE[S$V  
 //{{AFX_DATA_INIT(CCaptureDlg) `?f<hIJoz  
  m_bControl = FALSE; #K iqV6E  
  m_bAlt = FALSE; (y1S*_D  
  m_bShift = FALSE; /c6]DQ<?  
  m_Path = _T("c:\\"); Wtp=1  
  m_Number = _T("0 picture captured."); Ocn@JOg  
  nCount=0; hegH^IN M  
  bRegistered=FALSE; HrMbp  
  bTray=FALSE; S~&9DQNj  
 //}}AFX_DATA_INIT }:QoYNq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nc1?c1s,f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); T0.sL9  
} m=Mk@xfQ#  
yU"#2 *C  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r;E5e]w*-  
{  Z`|\%D%  
 CDialog::DoDataExchange(pDX); OMd:#cWsQ  
 //{{AFX_DATA_MAP(CCaptureDlg) .u`A4;;Gw  
  DDX_Control(pDX, IDC_KEY, m_Key); U??OiKVZ+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K@/dQV%Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Lr(JnS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); A PrrUo  
  DDX_Text(pDX, IDC_PATH, m_Path); F8M};&=*1r  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e2 g`T{6M  
 //}}AFX_DATA_MAP k_?~@G[I  
} wD W/?lT&  
&>R:oYN  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G*~CB\K_  
//{{AFX_MSG_MAP(CCaptureDlg) Qz_4Ms<o  
 ON_WM_SYSCOMMAND() .[1@wW&L  
 ON_WM_PAINT() P"Z1K5>2L  
 ON_WM_QUERYDRAGICON() J3B+WD]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8i<]$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6Q{OM:L/;.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9xE_Awlc85  
//}}AFX_MSG_MAP S,f#g?V  
END_MESSAGE_MAP() |34w<0Pc,  
O7 yj<  
BOOL CCaptureDlg::OnInitDialog() } :gi<#-:G  
{ |cC&,8O:{  
 CDialog::OnInitDialog(); J,s:CBCGL  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); kV8qpw}K  
 ASSERT(IDM_ABOUTBOX < 0xF000); /zr)9LQY0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Zv?"1Y< L  
 if (pSysMenu != NULL) &7\fj  
 { 6E(..fo:"  
  CString strAboutMenu; |`fuu2W!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); J4 U]_|  
  if (!strAboutMenu.IsEmpty()) IGab~`c-[  
  { H6Gs&yk3  
   pSysMenu->AppendMenu(MF_SEPARATOR); sE!g!ht  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L"0?g(< 5  
  } 8Z)wot  
 } _'^_9u G  
 SetIcon(m_hIcon, TRUE); // Set big icon 8-cuaa  
 SetIcon(m_hIcon, FALSE); // Set small icon 0kw)-)=  
 m_Key.SetCurSel(0); 09{s'  
 RegisterHotkey(); +At0V(  
 CMenu* pMenu=GetSystemMenu(FALSE); $Il  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Der'45]*^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7s;;2<k;_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =EU;%f  
 return TRUE; // return TRUE unless you set the focus to a control `DM)tm3&m  
} Dd-a*6|x  
L:Mjd47L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4$U^)\06W  
{ ml!c0<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g`tV^b")  
 { s?4nR:ZC}  
  CAboutDlg dlgAbout; F IB)cpo  
  dlgAbout.DoModal(); {.DY\;Q  
 } yL -}E  
 else nKI?Sc  
 {  .C5JQO  
  CDialog::OnSysCommand(nID, lParam); $D D esy3  
 } ,}9 tJY@ E  
} bf2r8   
sD&V_ &i  
void CCaptureDlg::OnPaint() e@/' o/  
{ T21?~jS  
 if (IsIconic()) >p" U|  
 { BHErc\ITP  
  CPaintDC dc(this); // device context for painting z+CX$.Z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); MD3iWgM  
  // Center icon in client rectangle <'7s3  
  int cxIcon = GetSystemMetrics(SM_CXICON); "=JE12=u  
  int cyIcon = GetSystemMetrics(SM_CYICON); }z|9F(I   
  CRect rect; TmM~uc7mj  
  GetClientRect(&rect); .[3C  
  int x = (rect.Width() - cxIcon + 1) / 2; oTcf[<   
  int y = (rect.Height() - cyIcon + 1) / 2; YD{N)v  
  // Draw the icon PtzT><  
  dc.DrawIcon(x, y, m_hIcon); lvNi/jk  
 } nV`W0r(f'  
 else u,N<U t  
 { " SP6o  
  CDialog::OnPaint(); VUz+ _)  
 } j%J>LeTca  
} ^L8:..+:  
6':Egh[;  
HCURSOR CCaptureDlg::OnQueryDragIcon() BQ70<m2D$  
{ cqW(9A|8  
 return (HCURSOR) m_hIcon; 2"%f:?xV{  
} p{ ``a=  
5r~hs6H  
void CCaptureDlg::OnCancel() fL]jk1.Xv-  
{ D(&WEmm\B  
 if(bTray) %L wq.  
  DeleteIcon(); 4Tx.|   
  CDialog::OnCancel(); S 2W@;XvV  
} ,e'"SVQc  
%Nob B  
void CCaptureDlg::OnAbout() "V`DhOG&  
{ V?p`rrj@  
 CAboutDlg dlg; GhjqStjS&l  
 dlg.DoModal(); N|ZGc{?  
} _{eA8J(A<  
A4b+:MQ*OX  
void CCaptureDlg::OnBrowse() y=[{:  
{ _#{qDG=  
 CString str; ~ t N/  
 BROWSEINFO bi; 6K=}n] n  
 char name[MAX_PATH]; _ sy]k A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); UdA,.C0  
 bi.hwndOwner=GetSafeHwnd(); yF|+oTp  
 bi.pszDisplayName=name; \ Z5160  
 bi.lpszTitle="Select folder"; 2$A"{2G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; P97i<pB Y_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *&R|0I{>  
 if(idl==NULL) GMoz$c6n_  
  return; J(= y$8xje  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^uVPN1}b^@  
 str.ReleaseBuffer(); 9- 24c  
 m_Path=str; zqZ/z>Gf  
 if(str.GetAt(str.GetLength()-1)!='\\') crSqbL  
  m_Path+="\\"; mQ:YHtHE.F  
 UpdateData(FALSE); raU_Z[  
} YIb7y1\UM  
?|!m  
void CCaptureDlg::SaveBmp() uss!E!_%,  
{ >$=l;jO`n  
 CDC dc; eIN0 T;1T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); aH8]$e8_,\  
 CBitmap bm; p1mAoVxR  
 int Width=GetSystemMetrics(SM_CXSCREEN); +RkXe;q  
 int Height=GetSystemMetrics(SM_CYSCREEN); yT='V1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \$F#bIjC  
 CDC tdc; -pQ?ybQ  
 tdc.CreateCompatibleDC(&dc); iWW >]3Q  
 CBitmap*pOld=tdc.SelectObject(&bm); 1&9w]\Ae7l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T, PN6d  
 tdc.SelectObject(pOld); bUSa#pNO>  
 BITMAP btm; kVG+Wr7l0F  
 bm.GetBitmap(&btm); KDA2 H>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; G-sQL'L[U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); J6rWe  
 BITMAPINFOHEADER bih; b' ~WS4xlD  
 bih.biBitCount=btm.bmBitsPixel; *m`x/_y+  
 bih.biClrImportant=0; wL6G&6]</W  
 bih.biClrUsed=0; Py/~Q-8p  
 bih.biCompression=0; dNov= w  
 bih.biHeight=btm.bmHeight; ^<   
 bih.biPlanes=1; ];N/KHeZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); \(`C*d  
 bih.biSizeImage=size; 4-$kc wA  
 bih.biWidth=btm.bmWidth; [kqO6U  
 bih.biXPelsPerMeter=0; cjd-B:l  
 bih.biYPelsPerMeter=0; M &H,`gm  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c%+uji6  
 static int filecount=0; : Cli8#  
 CString name; 2=1qmQE  
 name.Format("pict%04d.bmp",filecount++); X gtn}7N.  
 name=m_Path+name; eW}-UeT  
 BITMAPFILEHEADER bfh; u^WZsW  
 bfh.bfReserved1=bfh.bfReserved2=0; HsT6 #K  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 1' dZ?`O  
 bfh.bfSize=54+size; 5Kk}sxol  
 bfh.bfOffBits=54; [MKt\(  
 CFile bf; HIfi18  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !0):g/2h  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); dX[ Xe  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vu*9(t)EC  
  bf.WriteHuge(lpData,size); ,_=LV  
  bf.Close(); WH fl|e  
  nCount++; U#XW}T=|  
 } 7_lgo6  
 GlobalFreePtr(lpData); ^v:XON<  
 if(nCount==1) N.SV*G @  
  m_Number.Format("%d picture captured.",nCount); _.%g'=14f  
 else w=0zVh_`(  
  m_Number.Format("%d pictures captured.",nCount); yD8Qy+6L  
  UpdateData(FALSE); bQI.Qk  
} !d[]Qt%mA  
Z1;+a+S=z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]g,j  
{ N4{g[[ T  
 if(pMsg -> message == WM_KEYDOWN) .f!:@fX>=  
 { x@pzgqi3  
  if(pMsg -> wParam == VK_ESCAPE) Y$+v "  
   return TRUE; r|/9'{!  
  if(pMsg -> wParam == VK_RETURN) (/t{z =  
   return TRUE; %+UTs'I  
 } 9C5F#(uY  
 return CDialog::PreTranslateMessage(pMsg); <7/7+_y  
} &W&A88FfZU  
IA}.{zY~|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5Z#(C#  
{ z: )*Aobwv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l}#d^S/  
  SaveBmp(); %%h.`p1  
  return FALSE; 'gsO}xj  
} w[EEA_\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XSx'@ qH  
 CMenu pop; U2\k7I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oDG BC  
 CMenu*pMenu=pop.GetSubMenu(0); $d&7q5[  
 pMenu->SetDefaultItem(ID_EXITICON); Y'R/|:YL@  
 CPoint pt; 4=& d{.E  
 GetCursorPos(&pt); "39mhX2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c]ga) A(  
 if(id==ID_EXITICON) F>%,}Y~B:  
  DeleteIcon(); {`Mb),G  
 else if(id==ID_EXIT) |t#s h  
  OnCancel(); [RTo[-ci2  
 return FALSE;  {~w!  
} "ZmxHMf  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I^D*) z   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Kf$6D 79#  
 AddIcon(); \D#+0  
 return res; @9k/od@mW  
} D?H|O[  
gs~u8"B  
void CCaptureDlg::AddIcon() jX t5.9 t  
{ /~?[70B}E  
 NOTIFYICONDATA data; avXBCvP+h  
 data.cbSize=sizeof(NOTIFYICONDATA); eV0eMDY5  
 CString tip; ]a:T]x6'  
 tip.LoadString(IDS_ICONTIP); n~i^+pD@  
 data.hIcon=GetIcon(0); +5kQ;D{+  
 data.hWnd=GetSafeHwnd(); 7CX5pRNL  
 strcpy(data.szTip,tip); Ie8K [ >  
 data.uCallbackMessage=IDM_SHELL; ER4#5gd  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0-d&R@lX.  
 data.uID=98; s(MdjWw  
 Shell_NotifyIcon(NIM_ADD,&data); ye| 2gH  
 ShowWindow(SW_HIDE); E <r;J  
 bTray=TRUE; CKU)wJ5t  
} NpGz y`&b  
-, $:^4  
void CCaptureDlg::DeleteIcon() W)Yo-%  
{ ItAC=/(d  
 NOTIFYICONDATA data; x LK,Je  
 data.cbSize=sizeof(NOTIFYICONDATA); a3He-76  
 data.hWnd=GetSafeHwnd(); W,nn,%  
 data.uID=98; h{?f uoZj%  
 Shell_NotifyIcon(NIM_DELETE,&data); JNu+e#.Y  
 ShowWindow(SW_SHOW); Ka"1gbJ|  
 SetForegroundWindow(); +]Z *_?j9{  
 ShowWindow(SW_SHOWNORMAL); *kJa$3*r  
 bTray=FALSE; Imo?)dYK  
} ~AF' 6"A  
1}CJ&  
void CCaptureDlg::OnChange() =Q!V6+}nY^  
{ W:2]d  
 RegisterHotkey(); 7~H$p X  
} K-@cn*6  
X8XE_VtP  
BOOL CCaptureDlg::RegisterHotkey() ; y>}LGG  
{ @\=4 Rin/q  
 UpdateData(); cZw_^@!  
 UCHAR mask=0; ^j?"0|  
 UCHAR key=0; @ZcI]G%  
 if(m_bControl) op_ 1J;RF  
  mask|=4; 7TZ,bD_  
 if(m_bAlt) ;9uDV -"  
  mask|=2; hCj8y.X|E(  
 if(m_bShift) Ek '% % %  
  mask|=1; ~jC$C2A0  
  key=Key_Table[m_Key.GetCurSel()]; ED A6b]  
 if(bRegistered){ df$pT?o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); U a1Z,~ *  
  bRegistered=FALSE; pq]>Ep  
 } 9}d^ll&  
 cMask=mask; 3C#Sr6  
 cKey=key; c>#3{}X|x%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6N.MC B^  
 return bRegistered; M7(]NQ\TQ  
} )fc+B_  
u4[rA2Bf8E  
  四、小结 3X1 U  
p.vxrk`c  
  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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