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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: P.1Z@HC  
  3v`@**  
  一、实现方法 D>Rlm,U  
'- #QK'p  
  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: ,pQ[e$u1  
7m?fv Ky  
#pragma data_seg("shareddata") jtE'T}!d  
HHOOK hHook =NULL; //钩子句柄 R4$(NNC+/  
UINT nHookCount =0; //挂接的程序数目 &yOl}?u  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T\:*+W37  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &Mt0Qa[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dNov= w  
static int KeyCount =0; [6/8O  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NZFUCD)  
#pragma data_seg() :()K2<E  
OIjG`~Rx  
  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。 DNyt_5j&:  
:2:%  
  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: C#3&,G W  
0V`~z-#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ZjrBOb  
cKey,UCHAR cMask) ej=}OH4  
{ : Cli8#  
 BOOL bAdded=FALSE; Wc;N;K52   
 for(int index=0;index<MAX_KEY;index++){ roe_H>  
  if(hCallWnd[index]==0){ &!HG.7AY  
   hCallWnd[index]=hWnd; 6q `Un}  
   HotKey[index]=cKey; h,b_8g{!  
   HotKeyMask[index]=cMask; aOsc_5XDR;  
   bAdded=TRUE; %e|UA-(  
   KeyCount++; {]N7kY.W  
   break; N$.ls48a4-  
  } 7;] IlR6  
 } M8y|Lm}o  
 return bAdded; 1(% 6X*z  
} Ub4)x  
//删除热键 8H8Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \]\h,Y8  
{ ?`6Mfpvj96  
 BOOL bRemoved=FALSE; &>K|F >7q  
 for(int index=0;index<MAX_KEY;index++){ IMpL+W.  
  if(hCallWnd[index]==hWnd){ Ke~!1S8=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZZfi,0R  
    hCallWnd[index]=NULL; N.SV*G @  
    HotKey[index]=0; #c'}_s2F[  
    HotKeyMask[index]=0; aQzmobleep  
    bRemoved=TRUE; {BJH}vV1)  
    KeyCount--; #Pg?T%('`  
    break; h53G$Ol.  
   } 4! F$nmG)  
  } V!e*J,g  
 } #$!^1yO  
 return bRemoved; ?g0dr?H  
} {Hv kn{{'  
]+ tO  
]@ Vp:RGMr  
  DLL中的钩子函数如下: Y$+v "  
2^U?Ztth6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Xd1+?2  
{ XjxI@VXzUV  
 BOOL bProcessed=FALSE; gT,iH.  
 if(HC_ACTION==nCode) r]wy-GT  
 { y S<&d#:"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q 1u_r  
   switch(wParam) >N}+O<Fc  
   {  <xH! Yskc  
    case VK_MENU: s9fEx -!y  
     MaskBits&=~ALTBIT; v`:!$U* H=  
     break; .cmhi3o4  
    case VK_CONTROL: 2(Yt`3Go(  
     MaskBits&=~CTRLBIT; !MmbwB'  
     break; A-$ C6q   
    case VK_SHIFT: pF}E`U=Z  
     MaskBits&=~SHIFTBIT; N~S#( .}[  
     break; 5p3: 8G7  
    default: //judge the key and send message q>6,g>I  
     break; $d&7q5[  
   } 9,"gXsvx(  
   for(int index=0;index<MAX_KEY;index++){ &[yYgfsp  
    if(hCallWnd[index]==NULL) >gn@NJ2N  
     continue; !!Yf>0u#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q2Uk0:M  
    { <YCR^?hJSi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i=fhK~Jd  
     bProcessed=TRUE; wGHVq fm5  
    } ^a!oq~ZSy  
   } ?3v-ppw%  
  } QPvWdjf#mM  
  else if((lParam&0xc000ffff)==1){ //有键按下 )[yKO  
   switch(wParam) &iy7It  
   { 5D3&6DCH  
    case VK_MENU: M[_Ptqjb  
     MaskBits|=ALTBIT; |47 2X&e  
     break; [:A">eYI  
    case VK_CONTROL: 2%`8  
     MaskBits|=CTRLBIT; qi8AK(v  
     break; ogya~/  
    case VK_SHIFT: N2u4MI2  
     MaskBits|=SHIFTBIT; $ylxl"Y  
     break; (;HO3Z".q$  
    default: //judge the key and send message )k `+9}OO  
     break; V {}TG]  
   } hWX4 P  
   for(int index=0;index<MAX_KEY;index++){ gDX\ p>7  
    if(hCallWnd[index]==NULL) >9<rc[  
     continue; XqcNFSo)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Jr>Nc}!U  
    { ^{E_fQJX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Vu<mOuh  
     bProcessed=TRUE; OSC_-[b-  
    } ye| 2gH  
   } cn9=wm\\  
  } E6-~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &G3$q,`H  
   for(int index=0;index<MAX_KEY;index++){ bF +d_t  
    if(hCallWnd[index]==NULL) oiz]Bd  
     continue; z34+1d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z_T~2t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^vOEG;TR<-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5?E;Yy A  
   } ZCfd<NS?  
  } %r:4'$E7|  
 } KkR.p,/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Lk-h AN{[  
} }F3}"Ik'L  
+]Z *_?j9{  
  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: t Q>/1  
~6Odw GWV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8PG&/ " K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FGpV ]p  
J]Q-#g'Z  
  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: h?GE-F  
2k`Q+[?{q>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j?! /#'  
{ dmMrZ1u2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gLbTZM4i  
 { )_Iu7b  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ; y>}LGG  
  SaveBmp(); $^#q0Yx  
  return FALSE; uU+?:C  
 } !B#tJD  
 …… //其它处理及默认处理 UXHtmi|_:  
} P;ZVv{mT  
Vz y )jf  
3tmS/ tQp  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 GbC JGqOR  
}5QUIK~NA  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 U(<~("ocN  
xp"F)6  
  二、编程步骤 H.[(`wi!I  
pJQ_G`E  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ip*UujmNyR  
cs]3Rp^g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; R ~#&xfMd.  
" _TAo  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5N|hsfkx  
pEb/yIT"  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; T<mP.T,$!  
*o=( w5   
  5、 添加代码,编译运行程序。 M7(]NQ\TQ  
Lcs?2c:%  
三、程序代码 cvV8 ;  
d ?,wEfwp  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <!?ZH"F0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  t&G #%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1kh()IrA  
#if _MSC_VER > 1000 ^ pocbmg  
#pragma once (abtCuZ8z  
#endif // _MSC_VER > 1000 >i2WYT  
#ifndef __AFXWIN_H__ In}~bNv?  
#error include 'stdafx.h' before including this file for PCH ;O({|mpS\  
#endif BM02k\%  
#include "resource.h" // main symbols nTz( {q  
class CHookApp : public CWinApp ZgxpHo  
{ HB}iT1.`  
 public: )79F"ltz h  
  CHookApp(); /,ISx }  
  // Overrides N9O}6  
  // ClassWizard generated virtual function overrides mFBuKp+0)h  
  //{{AFX_VIRTUAL(CHookApp) , .uI>  
 public: .gw6W0\F  
  virtual BOOL InitInstance(); 8oP"?ew#  
  virtual int ExitInstance(); x\5\KGw16  
  //}}AFX_VIRTUAL QV=|' S  
  //{{AFX_MSG(CHookApp) TnPx.mwK\  
  // NOTE - the ClassWizard will add and remove member functions here. 4'L.I%#tZ  
  // DO NOT EDIT what you see in these blocks of generated code ! <!~NG3KW[>  
  //}}AFX_MSG &3YXDNm  
  DECLARE_MESSAGE_MAP() rmhL|! Y  
}; ZV~9{E8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); d-#yN:}0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &t74T"(d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q&: t$tSS  
BOOL InitHotkey(); !f# [4Xw  
BOOL UnInit(); b*cVC^{Dy  
#endif 6 $+b2&V  
p@+D$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. eg>]{`WQ  
#include "stdafx.h" '\Uy;,tu /  
#include "hook.h" L!:;H,  
#include <windowsx.h> ,Z[pLF  
#ifdef _DEBUG }[By N).  
#define new DEBUG_NEW p+:MZP -%(  
#undef THIS_FILE o@r~KFIe  
static char THIS_FILE[] = __FILE__; S6c>D&Q  
#endif IjRUL/\=  
#define MAX_KEY 100 VOrBNu  
#define CTRLBIT 0x04 }9Awv#+  
#define ALTBIT 0x02 j$khGR!  
#define SHIFTBIT 0x01 f,8PPJ:,  
#pragma data_seg("shareddata") c.;<+dYsm*  
HHOOK hHook =NULL; ob7hNo#  
UINT nHookCount =0; /SJI ~f+$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;)!);q+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4,7W*mr3(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~G8haN4  
static int KeyCount =0; *En4~;l  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift I<$m%  
#pragma data_seg() Dmn{ppfyb  
HINSTANCE hins; ]{pH,vk-  
void VerifyWindow(); O29GPs  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G8OnNI  
//{{AFX_MSG_MAP(CHookApp) 8>ODtKI *  
// NOTE - the ClassWizard will add and remove mapping macros here. e1 P(-V  
// DO NOT EDIT what you see in these blocks of generated code! =tqChw   
//}}AFX_MSG_MAP 6Vy4]jdT5  
END_MESSAGE_MAP() Rnk&:c  
M[Mx g  
CHookApp::CHookApp() HmRmZ3~  
{ ZgL]ex  
 // TODO: add construction code here, w(R+p/RF  
 // Place all significant initialization in InitInstance 3qrjb]E%}  
} a*Ng+~5)6  
p/Lk'h~  
CHookApp theApp; *!yY7 ~#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^a;412  
{ :X#'E Lo|  
 BOOL bProcessed=FALSE; vN`JP`IBx  
 if(HC_ACTION==nCode) $ Q*^c"&  
 { +ZPn[|  
  if((lParam&0xc0000000)==0xc0000000){// Key up >S HW  
   switch(wParam) =_,j89E  
   { E3h-?ugO'  
    case VK_MENU: 3 bl l9Ey  
     MaskBits&=~ALTBIT; Ip;;@o&D  
     break; "$N 4S9U  
    case VK_CONTROL: ug9]^p/)^  
     MaskBits&=~CTRLBIT; JS0957K  
     break; .Wvg{ S -  
    case VK_SHIFT: !v]~ut !p  
     MaskBits&=~SHIFTBIT; _Wo(;'.  
     break; j9$kaEf  
    default: //judge the key and send message 8jU6N*p/  
     break; {$)pkhJ  
   } %51HJB}C]  
   for(int index=0;index<MAX_KEY;index++){ AR5)Uw s  
    if(hCallWnd[index]==NULL) N##- vV  
     continue; (Ei} :6,}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MD=!a5'  
    { cW\Y1=Gv|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &%`0&y  
     bProcessed=TRUE; m7m)BX%O  
    } p"=8{LrO  
   } .oxeo 0@~  
  } z#{%[X2  
  else if((lParam&0xc000ffff)==1){ //Key down K{]\}7+   
   switch(wParam) 17B`  
   { gYvT'72  
    case VK_MENU: N1espc@j  
     MaskBits|=ALTBIT; NIxtT>[+3  
     break; teg[l-R"7z  
    case VK_CONTROL: pDG>9P#mO  
     MaskBits|=CTRLBIT; t[b@P<F  
     break; {DbWk>[DkG  
    case VK_SHIFT: -owap-Va  
     MaskBits|=SHIFTBIT; n_46;lD  
     break; 6B`,^8Lp  
    default: //judge the key and send message ;&]oV`Ib  
     break; z%Ivc*x5  
   } UViWejA/*u  
   for(int index=0;index<MAX_KEY;index++) Ln&CB!u  
   { #F6!x3Z  
    if(hCallWnd[index]==NULL) =fy'w3m  
     continue; d/xGo[?$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !eGUiE=  
    { Ihg1%.^V\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y_N h5  
     bProcessed=TRUE; s f<NC>-  
    } Cc!LJ  
   } %pr}Xs(-f  
  } g2W ZW#a)  
  if(!bProcessed){ 7 ?"-NrW~  
   for(int index=0;index<MAX_KEY;index++){ F)hUT@  
    if(hCallWnd[index]==NULL) H0Ck%5  
     continue; 2+qU9[kd|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oq9gG)F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bKP@-<:]  
   } G;v3kGn  
  } #EX NSr  
 } yU< "tgE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]5j1p6;(`  
} uw9w{3]0f  
<l"rnM%  
BOOL InitHotkey() fIm=^}?fwK  
{ W3-g]#\?  
 if(hHook!=NULL){ }-15^2  
  nHookCount++; JzuP A I  
  return TRUE; T,fDH!a  
 } U~YjTjbd  
 else yh"48@L'D  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); pl5Q2zq%  
  if(hHook!=NULL) pJPP6Be<  
   nHookCount++; ]{PJ  
  return (hHook!=NULL); H5?H{  
} \:`-"Ou(*  
BOOL UnInit() ^U0)iz  
{ :ej`]yK |  
 if(nHookCount>1){ e[*%tx H  
  nHookCount--; p )w{}@%r  
  return TRUE; /faP@Q3kR  
 } y`p(}X`>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &U0Y#11Cx  
 if(unhooked==TRUE){ 5qQ\H}  
  nHookCount=0; F@Cxjz  
  hHook=NULL; "IKbb7x  
 } C#D8 E.W  
 return unhooked; anxwK47  
} Lt\=E8&rh  
OZi4S3k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K:8. Dvn  
{ uEcK0>xp  
 BOOL bAdded=FALSE; "|W``&pM  
 for(int index=0;index<MAX_KEY;index++){ i4r8146D[  
  if(hCallWnd[index]==0){ U A}N  
   hCallWnd[index]=hWnd; |t&gyj  
   HotKey[index]=cKey; +U*:WKdI?  
   HotKeyMask[index]=cMask; fD ?w!7f-1  
   bAdded=TRUE; Jw)-6WJ!uO  
   KeyCount++; }@Ou]o  
   break; <CY<-H  
  } dEG1[QG  
 } TC^fyxq  
 return bAdded; T +~ _D  
} A N 'L- E  
L(w?.)E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =>,X)+O  
{  NncII5z  
 BOOL bRemoved=FALSE; &)#bdt[  
 for(int index=0;index<MAX_KEY;index++){ && E)  
  if(hCallWnd[index]==hWnd){ +tvWp>T+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =X}s^KbI{  
    hCallWnd[index]=NULL; TOXZl3 s5#  
    HotKey[index]=0; fT  
    HotKeyMask[index]=0; &VfMv'%x  
    bRemoved=TRUE; >XK |jPK  
    KeyCount--;  Jyo(Etp  
    break;  njg\y  
   } M"|({+9eG  
  } nZ8f}R!f:  
 } ZIikDi h1  
 return bRemoved; A,#a?O6m  
} +o^sm'$  
{2MS,Ua{  
void VerifyWindow() 9,G94.da  
{ ?_+8K`B  
 for(int i=0;i<MAX_KEY;i++){ Kuy0Ci  
  if(hCallWnd!=NULL){ P* .0kR1n  
   if(!IsWindow(hCallWnd)){ 56T{JTo  
    hCallWnd=NULL; 2L|)uCb  
    HotKey=0; LGPPyK Nx  
    HotKeyMask=0; LQ3J$N  
    KeyCount--; ^mu PjM+D  
   } |tqYRWn0  
  }  dPCn6  
 } Rg6/6/ IN  
} 4+'d">+|  
u:GDM   
BOOL CHookApp::InitInstance() 6R+EG{`  
{ wTkcR^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); HA0Rv#p  
 hins=AfxGetInstanceHandle(); *zTEK:+_  
 InitHotkey(); SWPb=[WEz  
 return CWinApp::InitInstance(); VAet!H+]  
} FCA]zR1  
)2mvW1M=7;  
int CHookApp::ExitInstance() -/3D0`R  
{ p~NFiZ,  
 VerifyWindow(); _8'z"w F  
 UnInit(); _W^{,*p  
 return CWinApp::ExitInstance(); 0;avWa)Q  
} pCt0[R;?  
Z2^B.r#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `=JGlN7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v JPX`T|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x>m=n_  
#if _MSC_VER > 1000 ? fmW'vs  
#pragma once L+J)  
#endif // _MSC_VER > 1000 cOo@UU P   
kcyT#'=j  
class CCaptureDlg : public CDialog bo04y)Iz  
{ XYdr~/[HPy  
 // Construction 9 Z79  
 public: do&0m[x%  
  BOOL bTray; _5&LV2  
  BOOL bRegistered; CGY,I UG  
  BOOL RegisterHotkey(); &&K"3"um  
  UCHAR cKey; ]?A-D,!(  
  UCHAR cMask; MMS#Ci=Lj  
  void DeleteIcon(); Egr'IbB  
  void AddIcon(); )W.Y{\D0  
  UINT nCount; Xl\yOMfp  
  void SaveBmp(); 6 ~d\+aV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H!vX#  
  // Dialog Data U9]&~jR  
  //{{AFX_DATA(CCaptureDlg) nMU[S +  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2X!!RS>qg  
  CComboBox m_Key; I^itlQ  
  BOOL m_bControl; BOf)27)  
  BOOL m_bAlt; IM$I=5y e  
  BOOL m_bShift; C3GI?| b  
  CString m_Path; }j6<S-s~  
  CString m_Number; ZKco  
  //}}AFX_DATA _ pKWDMB$z  
  // ClassWizard generated virtual function overrides m. DC  
  //{{AFX_VIRTUAL(CCaptureDlg) JDj^7\`  
 public: $3D#U^7i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Bn?MlG;aA  
 protected: 3E]IEf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $G@^!(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 71inHg  
  //}}AFX_VIRTUAL "R9^X3;  
  // Implementation {u_2L_  
 protected: 19# A7  
  HICON m_hIcon; XbMAcgS  
  // Generated message map functions 8@J5tFJ&%  
  //{{AFX_MSG(CCaptureDlg) >S=,ype~G  
  virtual BOOL OnInitDialog(); 9d1 G u"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7UA|G2Zr  
  afx_msg void OnPaint(); j3yz"-53e  
  afx_msg HCURSOR OnQueryDragIcon(); ZK8I f?SD  
  virtual void OnCancel(); Cv;\cI"&  
  afx_msg void OnAbout(); /!HFi>   
  afx_msg void OnBrowse(); 4,P!D3SH  
  afx_msg void OnChange(); StWF66u34&  
 //}}AFX_MSG 6kM'f}t[C  
 DECLARE_MESSAGE_MAP() ;gmfWHB<  
}; Y%A KN  
#endif H]d'#1G  
M +Jcg b]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9 &p;2/H  
#include "stdafx.h" *&sXC@^@^  
#include "Capture.h" Oxq} dX7S  
#include "CaptureDlg.h" *Qe{CE  
#include <windowsx.h> [[8.Xb  
#pragma comment(lib,"hook.lib") sksop4gu5  
#ifdef _DEBUG z(dX<  
#define new DEBUG_NEW Zk#?.z}  
#undef THIS_FILE >HlQ+bl$xw  
static char THIS_FILE[] = __FILE__; v'W`\MKY)  
#endif [*|QA 9  
#define IDM_SHELL WM_USER+1 H]JVv8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 96.Vm*/7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5*31nMP\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; cAAyyc"yJ  
class CAboutDlg : public CDialog wc6v:,&  
{ z~+gche>  
 public: dgsD~.((A  
  CAboutDlg(); 5xF R7%_&  
  // Dialog Data sM8AORd  
  //{{AFX_DATA(CAboutDlg) *N|s+  
  enum { IDD = IDD_ABOUTBOX }; ZUxlk+o9d  
  //}}AFX_DATA zA?]AL(+YW  
  // ClassWizard generated virtual function overrides q\gvX 76a  
  //{{AFX_VIRTUAL(CAboutDlg) ,H+LE$=  
 protected: Vn1hr;i]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OlI{VszR  
  //}}AFX_VIRTUAL eg vgi?y  
  // Implementation _$Hx:^p:  
 protected: aA/.EAc7  
  //{{AFX_MSG(CAboutDlg) SXI3y  
  //}}AFX_MSG LUjev\Re  
  DECLARE_MESSAGE_MAP() L_4Zx sIv  
}; z LHE;  
G B &+EZ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "t\gkJyK  
{ rt7]~W-  
 //{{AFX_DATA_INIT(CAboutDlg) d3|oKP6  
 //}}AFX_DATA_INIT :$"L;"  
} dfoFs&CSKh  
`!$I6KxT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _hb@O2f  
{ =z$XqT.'  
 CDialog::DoDataExchange(pDX); g~AO KHUP  
 //{{AFX_DATA_MAP(CAboutDlg) / NlT[@T  
 //}}AFX_DATA_MAP h&4f9HhS=  
} c#6g[TE@  
$SmmrM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7>`VZ?  
 //{{AFX_MSG_MAP(CAboutDlg) @Ja8~5:  
 // No message handlers VY9|8g/  
 //}}AFX_MSG_MAP Uc3-n`C  
END_MESSAGE_MAP() iS"(  
& M wvj  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -OS&(7  
: CDialog(CCaptureDlg::IDD, pParent) r6Hdp  
{ YIQm;E EG  
 //{{AFX_DATA_INIT(CCaptureDlg) !L#>wlX)  
  m_bControl = FALSE; $`emP Hel  
  m_bAlt = FALSE; u0@i3Po  
  m_bShift = FALSE; t TAql n|  
  m_Path = _T("c:\\"); .kO;9z\B  
  m_Number = _T("0 picture captured."); p(F}[bP  
  nCount=0; <?UIux  
  bRegistered=FALSE; 6eqPaIaD   
  bTray=FALSE; Y70[Nz  
 //}}AFX_DATA_INIT Qw ukhD7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KKd S h1  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lKd+,<  
} .#,!&Lt  
G' ~Z'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mOb*VH  
{ =Kv*M@  
 CDialog::DoDataExchange(pDX); Dg$Z5`%k8  
 //{{AFX_DATA_MAP(CCaptureDlg) . _5g<aw;  
  DDX_Control(pDX, IDC_KEY, m_Key); V^P]QQ\ )  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); VV*Z5U@b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }jQxwi)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "i\rhX  
  DDX_Text(pDX, IDC_PATH, m_Path); #-_';Er\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U9[ &ci  
 //}}AFX_DATA_MAP k|$08EK $  
} >Q$, } `U;  
4E`y*Hmzy+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ] {r*Z6bs  
//{{AFX_MSG_MAP(CCaptureDlg) |=^p`CT  
 ON_WM_SYSCOMMAND() zoV4Gl  
 ON_WM_PAINT() Awo H d7M  
 ON_WM_QUERYDRAGICON() (6R^/*-o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @hlT7C)xK  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) p9;Oe,Il  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }dl[~iKW  
//}}AFX_MSG_MAP |D %m>M6  
END_MESSAGE_MAP() cuO)cj]@e  
,&$+ {3  
BOOL CCaptureDlg::OnInitDialog() WB2An7i@"{  
{ IcM99'P(  
 CDialog::OnInitDialog();  :1q)l  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2nW:|*:/p6  
 ASSERT(IDM_ABOUTBOX < 0xF000); Une,Y4{u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .{` :  
 if (pSysMenu != NULL) _;G. QwHr  
 { *{qW7x.6h  
  CString strAboutMenu; e`pYO]Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); GJ:65)KU  
  if (!strAboutMenu.IsEmpty()) 7~@9=e8G  
  { !o+Y" * /  
   pSysMenu->AppendMenu(MF_SEPARATOR); /DG+8u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [Bn C_^[W  
  } q6 h'=By  
 } 3;@/`Z_\lt  
 SetIcon(m_hIcon, TRUE); // Set big icon S+^*rw  
 SetIcon(m_hIcon, FALSE); // Set small icon G%{J.J41F  
 m_Key.SetCurSel(0); u^DfRd&P0  
 RegisterHotkey(); hk =nXv2M  
 CMenu* pMenu=GetSystemMenu(FALSE); {:U zW\5l)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,(H`E?m1w4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &cDLSnR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k[9~Er+  
 return TRUE; // return TRUE unless you set the focus to a control = GN1l[X  
} k3F* D  
!c}?u_Z/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {}r#s>  
{ P9Ye e!*H  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Gwyjie9t  
 { KIyhvY~  
  CAboutDlg dlgAbout; b-Q*!U t  
  dlgAbout.DoModal();  !t.  
 } 5*M3sN  
 else qH#?, sK ^  
 { 'Z(KE2&?  
  CDialog::OnSysCommand(nID, lParam); Gjhpi5?%8  
 } nitKX.t8  
} }e/#dMEi  
5 )tDgm  
void CCaptureDlg::OnPaint() ]>j>bHG  
{  rG#o*oA  
 if (IsIconic()) N4]Sp v  
 { o!nw/7|  
  CPaintDC dc(this); // device context for painting <ttrd%VW  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (T290a9y>  
  // Center icon in client rectangle <+7]EwVcn^  
  int cxIcon = GetSystemMetrics(SM_CXICON); VFmG\  
  int cyIcon = GetSystemMetrics(SM_CYICON);  fP+RuZ  
  CRect rect; vy:-a G  
  GetClientRect(&rect); yf > rG  
  int x = (rect.Width() - cxIcon + 1) / 2; \fX0&l;T9\  
  int y = (rect.Height() - cyIcon + 1) / 2; |hx"yy'ux  
  // Draw the icon f*Z8C9)  
  dc.DrawIcon(x, y, m_hIcon);  c@eQSy  
 } +c7e[hz  
 else kGz0`8U Ru  
 { xqZZ(jZ  
  CDialog::OnPaint(); }da}vR"iL  
 } P\jnht  
} S*aVcyDEP  
%-lilo   
HCURSOR CCaptureDlg::OnQueryDragIcon() UF_?T.Rl^  
{ o\TXW qt  
 return (HCURSOR) m_hIcon; <\44%M"iC-  
} ec8 iZ8h8  
=3~5I&  
void CCaptureDlg::OnCancel() ^ gy"$F3{`  
{ k},@2#W]  
 if(bTray) [Re.sX}$Y  
  DeleteIcon(); ",v!geMvu  
  CDialog::OnCancel(); A$JL"~R  
} /8cfdP Ba  
??]b,f4CNa  
void CCaptureDlg::OnAbout() q0m> NA   
{ bZ5cKQ\6  
 CAboutDlg dlg; hL?"!  
 dlg.DoModal(); n<)gS7  
} &.v|yG]&  
'DhH:PR  
void CCaptureDlg::OnBrowse() cv=H6j]h |  
{ |//D|-2  
 CString str; RJ+["[k  
 BROWSEINFO bi; J4) ?hS  
 char name[MAX_PATH]; JK%UaEut=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4[XiD*  *  
 bi.hwndOwner=GetSafeHwnd(); LykB2]T  
 bi.pszDisplayName=name; 6)]zt  
 bi.lpszTitle="Select folder"; (nDen5Q|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Pb] EpyAW  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `Eg~;E:  
 if(idl==NULL) (teK0s;t5k  
  return; Y& p ~8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )azK&f@tR|  
 str.ReleaseBuffer(); `9`T,uJe  
 m_Path=str; xf7_|l  
 if(str.GetAt(str.GetLength()-1)!='\\') ,]LsX"u  
  m_Path+="\\"; %7v!aJ40  
 UpdateData(FALSE); lJJ`aYDp  
} =M],5<2;  
n8.Tag(#  
void CCaptureDlg::SaveBmp() K} ) w  
{ 0F-%C>&g  
 CDC dc; DX(!G a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /=@V5)  
 CBitmap bm; \sEH)$R'  
 int Width=GetSystemMetrics(SM_CXSCREEN); Koi-b  
 int Height=GetSystemMetrics(SM_CYSCREEN); `L m9!?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C~X"ZW:d[  
 CDC tdc; ~vscATQ  
 tdc.CreateCompatibleDC(&dc); WzqYB a  
 CBitmap*pOld=tdc.SelectObject(&bm); :soR7oHZ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "KKw\i  
 tdc.SelectObject(pOld); )1E#'v12 "  
 BITMAP btm; gkFw=Cd  
 bm.GetBitmap(&btm); FT Ytf4t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r E&}B5PN=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $)Ty@@7C  
 BITMAPINFOHEADER bih; .!)i    
 bih.biBitCount=btm.bmBitsPixel; XR+  
 bih.biClrImportant=0; `&jG8lHa  
 bih.biClrUsed=0; gXvE^fE  
 bih.biCompression=0; B'hN3.  
 bih.biHeight=btm.bmHeight; sI5S)^'IQ  
 bih.biPlanes=1; 62 9g_P)  
 bih.biSize=sizeof(BITMAPINFOHEADER); jL0=a.;  
 bih.biSizeImage=size; B&"c:)1 C2  
 bih.biWidth=btm.bmWidth; |lMc6C  
 bih.biXPelsPerMeter=0; 6$&%z Eh  
 bih.biYPelsPerMeter=0; c@x6<S%*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Wg=qlux-  
 static int filecount=0;  NArr2o2  
 CString name; f>[{1M]n\  
 name.Format("pict%04d.bmp",filecount++); i$6o>V6  
 name=m_Path+name; 9cQ;h37J>  
 BITMAPFILEHEADER bfh; ]VoJ7LoCZ'  
 bfh.bfReserved1=bfh.bfReserved2=0; w ,-4A o2x  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nk"nSXm3SR  
 bfh.bfSize=54+size; 4"s/T0C  
 bfh.bfOffBits=54; *YP:-  
 CFile bf; V?- ]ZkI  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b!T-{Ns6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ao, <G.>R  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F./P,hhN9  
  bf.WriteHuge(lpData,size); C1x(4&h  
  bf.Close(); TU^s!Tj  
  nCount++; df{6!}/(  
 } a)' P/P  
 GlobalFreePtr(lpData); ^+}~"nvD  
 if(nCount==1) /Zg4JQ~  
  m_Number.Format("%d picture captured.",nCount); `S|T&|ad0  
 else Uy<n7*H  
  m_Number.Format("%d pictures captured.",nCount); xiO10:L4  
  UpdateData(FALSE); 9P*p{O{_  
} >M7(<V  
~H:.&'E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s1J( -O  
{ x\!vr.  
 if(pMsg -> message == WM_KEYDOWN) .RPh#FI6J  
 { IZ@M K  
  if(pMsg -> wParam == VK_ESCAPE) MPMAFs  
   return TRUE; $AHdjQ[;6-  
  if(pMsg -> wParam == VK_RETURN) 8u"HW~~=  
   return TRUE; (H-kWT  
 } .q'{ 3  
 return CDialog::PreTranslateMessage(pMsg); vvP]tRZ  
} *l)}o4-$  
toel!+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pDt45   
{ lL*"N|Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vAzSpiv-  
  SaveBmp(); *z__$!LR  
  return FALSE; 0W,.1J2*  
} S5e"}.]|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m{by%  
 CMenu pop; Bh7dAV(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Mh=j^ [4Q  
 CMenu*pMenu=pop.GetSubMenu(0); !JbWxGN`jn  
 pMenu->SetDefaultItem(ID_EXITICON); ]%+T+ zg(Y  
 CPoint pt; d?A!0 ;(*  
 GetCursorPos(&pt); }r|$\ms  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HAAU2A9B2  
 if(id==ID_EXITICON) T]2=  
  DeleteIcon(); \I7,1I  
 else if(id==ID_EXIT) MGsY3~!K  
  OnCancel(); Jm,tN/o*  
 return FALSE; VJgYXPE `  
} %jxeh.B3B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "f>`ZFp^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [I=1   
 AddIcon(); FBS]U$1  
 return res; MGH2z:  
} @j=rS S  
F87c?Vh)K  
void CCaptureDlg::AddIcon() CM;B{*En  
{ ]p8<Vluv  
 NOTIFYICONDATA data; j {Sbf04  
 data.cbSize=sizeof(NOTIFYICONDATA); i)7B :uA  
 CString tip; r\$`e7d}!  
 tip.LoadString(IDS_ICONTIP); HH|N~pBJB  
 data.hIcon=GetIcon(0); a'?V:3 ]  
 data.hWnd=GetSafeHwnd(); jQ dIeQD+  
 strcpy(data.szTip,tip); O T .bXr~  
 data.uCallbackMessage=IDM_SHELL; !G;|~|fMV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ISg-?h/  
 data.uID=98; :\~YbA  
 Shell_NotifyIcon(NIM_ADD,&data); C&;m56  
 ShowWindow(SW_HIDE); r>J%Eu/O  
 bTray=TRUE; 4f'!,Q ;  
} :*eJ*(M  
oVY_|UujG  
void CCaptureDlg::DeleteIcon() *&~ '  
{ oT"7O 5v  
 NOTIFYICONDATA data; pV/5w<_x?  
 data.cbSize=sizeof(NOTIFYICONDATA); %:\GYs(Y  
 data.hWnd=GetSafeHwnd(); afd.v$63  
 data.uID=98; Qb'Q4@.  
 Shell_NotifyIcon(NIM_DELETE,&data); ;:'ABfs  
 ShowWindow(SW_SHOW); ),5A&qT*  
 SetForegroundWindow(); JN3&(t  
 ShowWindow(SW_SHOWNORMAL); x$.0 :jP/s  
 bTray=FALSE; I$*LMzve  
} jfpbD /  
vGchKN~_  
void CCaptureDlg::OnChange() '}F..w/  
{ kyr=q-y  
 RegisterHotkey();  jRhRw;  
} fr8hT(,s)  
Dp^6|T*HU  
BOOL CCaptureDlg::RegisterHotkey() ()zn8_z  
{ U9"Ij}  
 UpdateData(); `bW0Va N  
 UCHAR mask=0; ]P)2Q!X  
 UCHAR key=0; ~LJtlJ 0  
 if(m_bControl) LX m@h  
  mask|=4; Nzl`mx16  
 if(m_bAlt) ZV$!dHW/  
  mask|=2; UD_8#DO{m1  
 if(m_bShift) C@ "l"  
  mask|=1; ~{q; - &  
  key=Key_Table[m_Key.GetCurSel()]; Og?P5&C"9D  
 if(bRegistered){ kcE86Y=|x!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t LM/STb6  
  bRegistered=FALSE; !}=#h8fv  
 } !jRs5{n^Ol  
 cMask=mask; +HoCG;C{  
 cKey=key; &"clBR Vg  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pPJE.[)V/  
 return bRegistered; fT5vO.a  
} e%^PVi  
7mnZ,gpb  
  四、小结 ogG:Ai)90  
%[BOe4[  
  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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