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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: ra^"Vr  
  "MyMByomQ  
  一、实现方法 Ce} m_  
Uf~5Fc1d =  
  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: LB^xdMXi  
|q Pu*vR  
#pragma data_seg("shareddata") 2 e&M/{  
HHOOK hHook =NULL; //钩子句柄 "1rT> ASWI  
UINT nHookCount =0; //挂接的程序数目 igF<].'V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0m4'm<2m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <A&Zl&^1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey c;88Wb<|W  
static int KeyCount =0; )<.y{_QUN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 '-P+|bZW4  
#pragma data_seg() [iC]Wh%  
.L.9e#?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。 ?B<.d8i  
Myh?=:1~(c  
  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: f\H1$q\p\  
4j<[3~:0 o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1e I_F8I U  
cKey,UCHAR cMask) @su!9]o  
{ l$m}aQ%h  
 BOOL bAdded=FALSE; 7hT@,|(j  
 for(int index=0;index<MAX_KEY;index++){ NdC5w-WY  
  if(hCallWnd[index]==0){ T `o[whr  
   hCallWnd[index]=hWnd; ~gg&G~ ET  
   HotKey[index]=cKey; gq~"Z[T  
   HotKeyMask[index]=cMask; =0SJf 3  
   bAdded=TRUE; j2mMm/kq\  
   KeyCount++; Qki? >j"  
   break; TwKi_nh2m  
  } =tl~@~pqI  
 } Px gul7  
 return bAdded; _!9I f  
} dEam|  
//删除热键 kv<(N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) As j<u!L  
{ j? Vs"d|  
 BOOL bRemoved=FALSE; ts r{-4V  
 for(int index=0;index<MAX_KEY;index++){ o+Q2lO5  
  if(hCallWnd[index]==hWnd){ aTs9lr:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )*aAkM  
    hCallWnd[index]=NULL; Bq tN=  
    HotKey[index]=0; p:3w8#)MZ  
    HotKeyMask[index]=0; wcGv#J],  
    bRemoved=TRUE; n/YnISt  
    KeyCount--; ulfs Z:  
    break; #p-\Y7f  
   } =]1g*~%  
  } Ho $+[K  
 } :bXTV?#0  
 return bRemoved; R#s_pW{op  
} 1D%E})B6  
EB p g  
a>k9& w  
  DLL中的钩子函数如下: yGH')TsjD  
\8USFN~(Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Is9.A_0h  
{ Y\F4  
 BOOL bProcessed=FALSE; CiTWjE?|7  
 if(HC_ACTION==nCode) 9fsc>9  
 { )M@^Z(W/a  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 F1p|^hYDW  
   switch(wParam) L+0:'p=  
   {  n%!50E6*:  
    case VK_MENU: %1)JRc  
     MaskBits&=~ALTBIT; zbfe=J4c  
     break; .`oKd@I*"  
    case VK_CONTROL: j?VHR$  
     MaskBits&=~CTRLBIT; Ii>#9>!F  
     break; }d@;]cps  
    case VK_SHIFT: S`vw<u4t  
     MaskBits&=~SHIFTBIT; J!}R>mR  
     break; ajX] ui  
    default: //judge the key and send message rw?wlBEG%  
     break; !04 ^E  
   } }&%&0$%  
   for(int index=0;index<MAX_KEY;index++){ |*L/ m0'L  
    if(hCallWnd[index]==NULL) WN o+%  
     continue; &iT^IkA{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &uI33=   
    { 4v2JrC;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5Hs !s+  
     bProcessed=TRUE; 1;vwreJ  
    } ?i}wm`  
   } *=77|Dba  
  } s:I 8~Cc  
  else if((lParam&0xc000ffff)==1){ //有键按下 JC}T*h>Ee  
   switch(wParam) 6mjD@  
   { CS0q#?  
    case VK_MENU: 5'_:>0}  
     MaskBits|=ALTBIT; kqGydGh*"  
     break; 0UQ DB5u  
    case VK_CONTROL: m`jGBSlw_  
     MaskBits|=CTRLBIT; #q8/=,3EG  
     break; _,w*Rv5=  
    case VK_SHIFT: FPEab69  
     MaskBits|=SHIFTBIT; o_r{cnu  
     break; ^$<:~qq !  
    default: //judge the key and send message 5xa!L@)`wF  
     break; S4OOm[8  
   } WL3J>S_  
   for(int index=0;index<MAX_KEY;index++){ Y>K8^GS  
    if(hCallWnd[index]==NULL) f|2QI ~R  
     continue; ~O 4@b/!4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i(xL-&{  
    { z'0 =3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); S(:|S(  
     bProcessed=TRUE; 2t7=GA+j  
    } [ * !0DW`  
   } <<H'Z  
  } fLV@~T|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ][~rk?YY  
   for(int index=0;index<MAX_KEY;index++){ |^#Z!Hp_Y  
    if(hCallWnd[index]==NULL) u Npa2{S'  
     continue; d!"gb,ec  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mOb@w/f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); B'6(Ao=3/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }RQ'aeVl(  
   } $[b1_Db  
  } dCzS f4:  
 } D?"Q)kVuD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V_KHVul  
} X$ A ]7t  
=HMuAUa.  
  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: YW"nPZNPy~  
ppO!v?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *k0;R[IAV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aI\]R:f,  
A \Z_br  
  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 ahY+$L,  
c43&[xP Lz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VGOdJ|2]Wr  
{ zZV9`cqZ{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]K<7A!+@@p  
 { pzU:AUW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'JAe =K H  
  SaveBmp(); Q|Nw @7$`  
  return FALSE; _ sBFs.o  
 } 4 rD&Lg'  
 …… //其它处理及默认处理 +^a@U^V  
} hxGo~<. :  
`[tYe<  
QtOT'<2t]  
  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。 RG- ,<G`  
ST\d -x  
  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。 {tnhP^C3>  
-i4hJC!3  
  二、编程步骤 pFEU^]V3*  
U"K%ip:Wd  
  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"; +b{tk=Q:  
&9xcP.3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5%" 0  
sA+( |cEh  
  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; "mcuF]7F  
_61tE  
  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; [V;Q#r&+  
0|?DA12Z  
  5、 添加代码,编译运行程序。 QW&@>i  
{;hR FQ^b  
三、程序代码 K ?V' ?s  
M'$?Jp#]}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL weIlWxy  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )lVplAhZD  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ smX&B,&@  
#if _MSC_VER > 1000 OP DRV\  
#pragma once "9;Ay@'B  
#endif // _MSC_VER > 1000 -J++b2R\%  
#ifndef __AFXWIN_H__ EyV6uk~  
#error include 'stdafx.h' before including this file for PCH Y>K3.*.  
#endif ;*e$k7}F  
#include "resource.h" // main symbols @oFuX.  
class CHookApp : public CWinApp ] -G~  
{ ~<=wTns!  
 public: 8uB6C0,6?  
  CHookApp(); ~93+Oxg  
  // Overrides 6Ou[t6  
  // ClassWizard generated virtual function overrides OI)/J;[-e  
  //{{AFX_VIRTUAL(CHookApp) {-s7_\|p(  
 public: bd`}2vr  
  virtual BOOL InitInstance(); Y^ ,G} &p  
  virtual int ExitInstance(); 0j[%L!hny  
  //}}AFX_VIRTUAL ~Yl%{1  
  //{{AFX_MSG(CHookApp) o]0\Km  
  // NOTE - the ClassWizard will add and remove member functions here. M\=/i\-  
  // DO NOT EDIT what you see in these blocks of generated code ! $p.0[A(N  
  //}}AFX_MSG Fh^Ax3P(  
  DECLARE_MESSAGE_MAP() @|9V]bk  
}; 7XiR)jYo*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Tc;j)_C)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G88g@Exk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -}Gk@=$G  
BOOL InitHotkey(); ;5=5HYx%  
BOOL UnInit(); ~)!vhdBe  
#endif [1.>9ngj  
](^BQc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 50`<[w<J q  
#include "stdafx.h" FdmoR;  
#include "hook.h" vv`,H~M6  
#include <windowsx.h> K$~Ja  
#ifdef _DEBUG \@*D;-b  
#define new DEBUG_NEW W sDFui  
#undef THIS_FILE YXTd^M~@D  
static char THIS_FILE[] = __FILE__; W$u/tRF  
#endif 3?yq*uE}  
#define MAX_KEY 100 6s&%~6J,  
#define CTRLBIT 0x04 {i:Ayhq~&  
#define ALTBIT 0x02 EN~ha:9  
#define SHIFTBIT 0x01 |dk9/xdX  
#pragma data_seg("shareddata") = k>ygD_  
HHOOK hHook =NULL; _6MNEoy?  
UINT nHookCount =0; _<;westq  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {@3p^b*E)1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8Sg :HU\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey > 0NDlS%Q:  
static int KeyCount =0; tfq; KR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \ dZD2e4  
#pragma data_seg() qeoj  
HINSTANCE hins; "z ;ky8  
void VerifyWindow(); ;O * o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) GZNfx8zsY+  
//{{AFX_MSG_MAP(CHookApp) m*H6\on:  
// NOTE - the ClassWizard will add and remove mapping macros here. aZYs?b>Gm  
// DO NOT EDIT what you see in these blocks of generated code! mX QVL.P\  
//}}AFX_MSG_MAP 5\P3JoH:Yg  
END_MESSAGE_MAP() ~er4w+"  
d i#:KW  
CHookApp::CHookApp() NFlrr*=t>  
{ gX *i"Y#  
 // TODO: add construction code here, V?+Y[Q  
 // Place all significant initialization in InitInstance J l9w/T  
} rTLo6wI  
i sV9nWo$  
CHookApp theApp; 1M/_:UH`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /*) =o+  
{ $eUJd Aetk  
 BOOL bProcessed=FALSE; **lT ' D  
 if(HC_ACTION==nCode) YNWAef4  
 { EXTQ:HSES  
  if((lParam&0xc0000000)==0xc0000000){// Key up O=w u0n  
   switch(wParam) 'P<T,:z?  
   { =;@?bTmqD  
    case VK_MENU: dFVm18  
     MaskBits&=~ALTBIT; ,daZ KxT  
     break; tz"zQC$  
    case VK_CONTROL: rD SUhO{V  
     MaskBits&=~CTRLBIT; PEHaH"|([=  
     break; s9}VnNr  
    case VK_SHIFT: 00(#_($  
     MaskBits&=~SHIFTBIT; 5_ioJ   
     break; Xw[|$#QKM  
    default: //judge the key and send message XveG#oyiU  
     break; 8gI~x.k`  
   } G[!Y6c 3  
   for(int index=0;index<MAX_KEY;index++){ ,mW-O!$3W  
    if(hCallWnd[index]==NULL) 8t Ef>  
     continue; ?g #4&z.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7Yd]#K{$  
    { )nJh) {4\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M4(`o^n  
     bProcessed=TRUE; dGBVkb4]T  
    } >J No2  
   } Af_yb`W?  
  } A/{0J\pA  
  else if((lParam&0xc000ffff)==1){ //Key down - d(RK_  
   switch(wParam) SRf .8j  
   { !]z6?kUK  
    case VK_MENU: */yR _f  
     MaskBits|=ALTBIT; L;s,xV  
     break; {!rpE7P-  
    case VK_CONTROL: $6p|}<u  
     MaskBits|=CTRLBIT; J`4{O:{4  
     break; .~Z@y#  
    case VK_SHIFT: M]$_>&"  
     MaskBits|=SHIFTBIT; `jyBF  
     break; bp?4)C*R  
    default: //judge the key and send message 7*&$-Hv  
     break; #GT4/Ej}W  
   } -v7O*xm"  
   for(int index=0;index<MAX_KEY;index++) {]CO;5:  
   { Swg%[r=p=  
    if(hCallWnd[index]==NULL) D,J yb0BW  
     continue; q-)Ynp4'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H]/!J]  
    { z4 yV1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); El)WjcmH  
     bProcessed=TRUE; XKq}^M&gy  
    } ?yqTLj  
   } T=n)ea A  
  } =-U8^e_Y  
  if(!bProcessed){ rF8n z:8  
   for(int index=0;index<MAX_KEY;index++){ d*{NAq'9X  
    if(hCallWnd[index]==NULL) F ak"u'~  
     continue; p:n.:GZ=y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pl.K*9+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9s}y*Vp  
   } ;jgJI~3l  
  } L&2 Zn{#`  
 } >^fkHbgNQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -I\Y m_)  
} !?~>f>js_l  
)m7 Yo  
BOOL InitHotkey() ?QXc,*=N  
{ Os# V=P  
 if(hHook!=NULL){ L93KsI  
  nHookCount++; }.j09[<  
  return TRUE; RC| t-(Z  
 } Fl'+ C  
 else sC=fXCGW\p  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  #nS  
  if(hHook!=NULL) j>70AE3[8  
   nHookCount++; ~20O&2  
  return (hHook!=NULL); 3LaqEj  
} psHW(Z8G  
BOOL UnInit() (3>Z NTm  
{ {IlX@qWr  
 if(nHookCount>1){ 3:;2Av2(X.  
  nHookCount--; ,?Bo x  
  return TRUE; ~A5MzrvIO2  
 } s$s]D\N  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e viv,  
 if(unhooked==TRUE){ rfdT0xfcU  
  nHookCount=0; 0DFxVH_xN  
  hHook=NULL; %j3 *j  
 } FB-_a  
 return unhooked; LS=HX~5C  
} ?u`TX_OsB  
>,Zf3M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b:,S  
{ nz=X/J6  
 BOOL bAdded=FALSE; ~HH#aXh*  
 for(int index=0;index<MAX_KEY;index++){ FYe(S V(9  
  if(hCallWnd[index]==0){ )aOPR|+  
   hCallWnd[index]=hWnd; ]i3 1@O  
   HotKey[index]=cKey; ;&N;6V"}  
   HotKeyMask[index]=cMask; _;Q1P gT  
   bAdded=TRUE; 3\xvy{r  
   KeyCount++; PV*U4aP  
   break; nzdJ*C  
  } O<1qU M  
 } V _&>0P{q  
 return bAdded; X$L9 kZ  
} \Ami-<T  
MMpGI^x!-X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XkWO-L  
{ T-: @p>  
 BOOL bRemoved=FALSE; YmS}*>oz  
 for(int index=0;index<MAX_KEY;index++){ f ,?P1D\  
  if(hCallWnd[index]==hWnd){ ]&')# YO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ig hd,G-  
    hCallWnd[index]=NULL; ` R;6]/I?  
    HotKey[index]=0; /GK1}h  
    HotKeyMask[index]=0; *)V1Sd#m  
    bRemoved=TRUE; d8|bO#a%9  
    KeyCount--; (qDu|S3P  
    break; 7n-;++a5]  
   } zF6]2Y?k%  
  } R(?g+:eCpM  
 } iY /N%T;  
 return bRemoved; <23oyMR0  
} &gn^i!%Z)  
~f[AEE~,s+  
void VerifyWindow() 1Qi5t?{  
{ 6w d0"  
 for(int i=0;i<MAX_KEY;i++){ h|_E>6d)  
  if(hCallWnd!=NULL){ R).?lnS  
   if(!IsWindow(hCallWnd)){ Jv*(DFt!v  
    hCallWnd=NULL; ?]`kc  
    HotKey=0; `Ns$HV  
    HotKeyMask=0; ZYy,gu<  
    KeyCount--; Q)\~=/L b  
   } y^o*wz:D*  
  } bIR AwktD  
 } Q1fJ`A=  
} q F \a]e  
f_*Bd.@  
BOOL CHookApp::InitInstance() 1N#KVvK  
{ 8\+Q*7~@i  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ohFUy}y  
 hins=AfxGetInstanceHandle(); A8?uCkG  
 InitHotkey(); m"{D}(TA  
 return CWinApp::InitInstance(); H1]An'qz,  
} fa7I6 i  
Pd99vq/  
int CHookApp::ExitInstance() w&eX)!  
{ vjy59m  
 VerifyWindow(); yw|O,V<4N  
 UnInit(); 3x=f}SO&  
 return CWinApp::ExitInstance(); <+1d'VQ2  
} hrpql_9.  
#S57SD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =Fq"lq %  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "t4$%7L]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k^ CFu  
#if _MSC_VER > 1000 eIz T(3(  
#pragma once vZHm'  
#endif // _MSC_VER > 1000 de?Bn+mvi.  
SjT8 eH #  
class CCaptureDlg : public CDialog 3d qj:4[f  
{ ,k*g `OTW  
 // Construction l2))StEm  
 public: WUQlAsme  
  BOOL bTray; YQyf:xJ  
  BOOL bRegistered; mHqw,28}  
  BOOL RegisterHotkey(); 2|xNT9RW  
  UCHAR cKey; r Z0+mS'/G  
  UCHAR cMask; <,%qt_ !  
  void DeleteIcon(); W}<'Y@[ ,  
  void AddIcon(); lg)jc3  
  UINT nCount; rkF]Q_'`t;  
  void SaveBmp(); |IbCN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?mdgY1  
  // Dialog Data a#iJXI  
  //{{AFX_DATA(CCaptureDlg) UenB4  
  enum { IDD = IDD_CAPTURE_DIALOG }; xn49[T  
  CComboBox m_Key; 3cuVyf<v  
  BOOL m_bControl; c$.h]&~dN  
  BOOL m_bAlt; H pHXt78  
  BOOL m_bShift; l$ABOtM@  
  CString m_Path; ,J|8P{ZO  
  CString m_Number; VTOZ #*f  
  //}}AFX_DATA fVlTsc|e  
  // ClassWizard generated virtual function overrides n\f8%z  
  //{{AFX_VIRTUAL(CCaptureDlg) s2-`}LL  
 public: VKW9Rn9Qg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); wb@TYvDt  
 protected: d4Y8q1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |!VSed#FSn  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `GsFvxz  
  //}}AFX_VIRTUAL n>d@}hyv  
  // Implementation 39jnoT  
 protected: FL}k0  
  HICON m_hIcon; 6I0G.N  
  // Generated message map functions <!ewb=[_$  
  //{{AFX_MSG(CCaptureDlg) 3jMHe~.E<  
  virtual BOOL OnInitDialog(); otQulL)T/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;A ~efC^<  
  afx_msg void OnPaint(); cNi)[2o7  
  afx_msg HCURSOR OnQueryDragIcon(); ys+ AY^/  
  virtual void OnCancel(); 0_d,sC?V  
  afx_msg void OnAbout(); xh$1Rwa  
  afx_msg void OnBrowse(); ,G,'#]  
  afx_msg void OnChange(); p<5ED\;N;  
 //}}AFX_MSG XG]ltSOy  
 DECLARE_MESSAGE_MAP() M=Y}w?  
}; DH(Q md  
#endif V=)0{7-9  
)24c(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t2)S61Vr  
#include "stdafx.h" R5iv]8X4W  
#include "Capture.h" XH_XGzBQS  
#include "CaptureDlg.h" 5$kv,%ah  
#include <windowsx.h> 1'q llkT  
#pragma comment(lib,"hook.lib") 2b|$z"97jj  
#ifdef _DEBUG %d..L-`]ET  
#define new DEBUG_NEW  >'>onAIL  
#undef THIS_FILE [ D[&aA  
static char THIS_FILE[] = __FILE__; Z^AOV:|m  
#endif q.s2x0  
#define IDM_SHELL WM_USER+1 ~f/nq/8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cVHv>nd#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %y( oY  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +8tdAw  
class CAboutDlg : public CDialog W2CCLq1(  
{ :JBvCyj4PE  
 public: [ugBVnma  
  CAboutDlg(); fmuAX w>  
  // Dialog Data QLx]%E\  
  //{{AFX_DATA(CAboutDlg) s bf\;_!  
  enum { IDD = IDD_ABOUTBOX }; *h=|KOS  
  //}}AFX_DATA >Qk4AMIO  
  // ClassWizard generated virtual function overrides K8,fw-S%  
  //{{AFX_VIRTUAL(CAboutDlg) N1dp%b9W(  
 protected: 9cJzL"yi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]s3U+t?  
  //}}AFX_VIRTUAL i #5rk(^t  
  // Implementation 9EryHV|  
 protected: y/!h.[  
  //{{AFX_MSG(CAboutDlg) $tGk,.#j  
  //}}AFX_MSG C]22 [v4  
  DECLARE_MESSAGE_MAP() Tv d=EO  
}; oz!;sj{,D  
R)s@2S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {1H3VSYq  
{ Jg I+k Nx  
 //{{AFX_DATA_INIT(CAboutDlg) 5ZG-3qj  
 //}}AFX_DATA_INIT JGS4r+   
} `^t0379e  
3*13XQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v!oXcHK/  
{ Dps0$f c  
 CDialog::DoDataExchange(pDX); &. sfu$]  
 //{{AFX_DATA_MAP(CAboutDlg) M" |Mte  
 //}}AFX_DATA_MAP B+y r 6Q.  
} 39s%CcI`k  
/ESmQc:DWB  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) yFp8 >  
 //{{AFX_MSG_MAP(CAboutDlg) Gy*6I)l  
 // No message handlers hhu !'(j  
 //}}AFX_MSG_MAP Isa]5>  
END_MESSAGE_MAP() :Oz! M&Ov  
-rYOx9P4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *,w9#?2x  
: CDialog(CCaptureDlg::IDD, pParent) [[{y?-U  
{ tx=~bm"*?  
 //{{AFX_DATA_INIT(CCaptureDlg) wO6`Ap t1:  
  m_bControl = FALSE; Etk`>,]Y>y  
  m_bAlt = FALSE; zY@|KV"^r  
  m_bShift = FALSE; &%QtUPvr9  
  m_Path = _T("c:\\"); BdHLow  
  m_Number = _T("0 picture captured."); ulM6R/ V:?  
  nCount=0; i#$N,kt  
  bRegistered=FALSE; `'BvUTDyZ  
  bTray=FALSE; a0y7a/@c  
 //}}AFX_DATA_INIT >3HLm3T  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6 /T_+K.k  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &lg+uK  
} !C&!Wj  
A;~u"g'z&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /aa'ryl_%  
{ tlo"tl_]  
 CDialog::DoDataExchange(pDX); =;(wBj  
 //{{AFX_DATA_MAP(CCaptureDlg) k(>hboR5n  
  DDX_Control(pDX, IDC_KEY, m_Key); !b<c*J?f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !o.l:Mr  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *M*:3 v 0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vO#4$ ,  
  DDX_Text(pDX, IDC_PATH, m_Path); (/J$2V5-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 86J7%;^Xa  
 //}}AFX_DATA_MAP E}S)uI,gn  
} H]a;<V9[  
&M$s@FUY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RC5b'+E&#  
//{{AFX_MSG_MAP(CCaptureDlg) t\2Lo7[Pu  
 ON_WM_SYSCOMMAND() 1n7tmRl  
 ON_WM_PAINT() q5il9*)d (  
 ON_WM_QUERYDRAGICON() x%kS:!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $j(2M?.>#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g%1FTl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #S+GI!  
//}}AFX_MSG_MAP cE S3<`[K  
END_MESSAGE_MAP() " $5J7  
;74hOHDS  
BOOL CCaptureDlg::OnInitDialog() Vw7NLTE}`  
{ nKn,i$sO/.  
 CDialog::OnInitDialog(); '+tU8Pb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ndRy&[f7  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]<D9Q>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }5#<`8  
 if (pSysMenu != NULL) MW%EJT>@z  
 { ;Wjb}_V:_  
  CString strAboutMenu; ^Xjh?+WM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); x|/zn<\^  
  if (!strAboutMenu.IsEmpty()) p;av63 i  
  { `PI,tmv!  
   pSysMenu->AppendMenu(MF_SEPARATOR); WZ}c)r*R  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "qEHK;  
  } yE3g0@*  
 } mO$]f4}  
 SetIcon(m_hIcon, TRUE); // Set big icon &E.ckWf  
 SetIcon(m_hIcon, FALSE); // Set small icon z@hlN3dg  
 m_Key.SetCurSel(0); Yrp WGK520  
 RegisterHotkey(); i>gbT+*E!  
 CMenu* pMenu=GetSystemMenu(FALSE); GJW>8*&&(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Hf P2o5-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +JE h7  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <6k5nEh  
 return TRUE; // return TRUE unless you set the focus to a control /I~iUND"G  
} @A(*&PU>j  
56(S[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =>".  
{ 8 /Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Nq>74q]}n8  
 { Ct[{>asun  
  CAboutDlg dlgAbout; ^S*~<0NQ'  
  dlgAbout.DoModal(); m_~!Lj[u.  
 } xk=5q|u_-  
 else r=[T5,L(s  
 { FVkb9(WW  
  CDialog::OnSysCommand(nID, lParam); f1F#U @U  
 } Y*iYr2?;  
} l v]TE"  
f,Vj8@p)x  
void CCaptureDlg::OnPaint() Tvr2K84l  
{ {f] K3V  
 if (IsIconic()) (C/2shr 8  
 { A=q)kcuy5  
  CPaintDC dc(this); // device context for painting c%Y%c2([  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); C Sx V^  
  // Center icon in client rectangle HJT}v/FZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); <^+~? KDZM  
  int cyIcon = GetSystemMetrics(SM_CYICON); `(A>7;]:  
  CRect rect; FCxLL"))  
  GetClientRect(&rect); 1t{h)fwi  
  int x = (rect.Width() - cxIcon + 1) / 2; 7a.$tT  
  int y = (rect.Height() - cyIcon + 1) / 2; Iy8>9m'5  
  // Draw the icon Ndq|Hkd  
  dc.DrawIcon(x, y, m_hIcon); f Co-ony  
 } RYzDF+/  
 else 3uO#/EbS  
 { ?2l#=t?PP  
  CDialog::OnPaint(); 47s<xQy  
 } ,w%cX{  
} NqcmjHvy  
isK~=  
HCURSOR CCaptureDlg::OnQueryDragIcon() nsWenf  
{ `HXP*Bp#  
 return (HCURSOR) m_hIcon; ~[bS+ ]d!  
} NBzyP)2)  
~`M>&E@Y_/  
void CCaptureDlg::OnCancel() 7:x%^J+  
{ v2R41*z,  
 if(bTray) $ )ps~  
  DeleteIcon(); p#HbN#^Hy  
  CDialog::OnCancel(); VF1)dd  
} ^b=]=w  
\ZiZ X$  
void CCaptureDlg::OnAbout() e6n1/TtqM  
{ }Th":sin},  
 CAboutDlg dlg; {B$cd?}  
 dlg.DoModal(); Ek\f x*Lz  
} MJ^NRT0?b  
 |/K+tH  
void CCaptureDlg::OnBrowse() _%#Q \ D  
{ u=B_cA}:  
 CString str; HPVW2Y0_N  
 BROWSEINFO bi; J{8_4s!Xt>  
 char name[MAX_PATH]; MK"PCE5^i6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); b Z c&uq_  
 bi.hwndOwner=GetSafeHwnd(); ldcYw@KQ  
 bi.pszDisplayName=name; 7MIu-x|  
 bi.lpszTitle="Select folder"; D )z'FOaI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; q]Gym 7o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  R~u0!  
 if(idl==NULL) DArEIt6Q  
  return; [OJ@{{U%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); m)4s4P57y  
 str.ReleaseBuffer(); .m_yx{FZ=  
 m_Path=str; 5Gm,lNQAv  
 if(str.GetAt(str.GetLength()-1)!='\\') envu}4wU=e  
  m_Path+="\\"; 4Fhiac  
 UpdateData(FALSE); "-JJ6Bk  
} pnin;;D*  
^L}fj$  
void CCaptureDlg::SaveBmp() N\b%+vR  
{ [AE-~+m)^  
 CDC dc; ypE cjVP D  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); AkdONKO8{  
 CBitmap bm; Ijq',@jE  
 int Width=GetSystemMetrics(SM_CXSCREEN); H|>dF)%pj  
 int Height=GetSystemMetrics(SM_CYSCREEN); cQEK>aAd  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lV!ecJw$  
 CDC tdc; WHxq-&=  
 tdc.CreateCompatibleDC(&dc); /zZ$<mVG  
 CBitmap*pOld=tdc.SelectObject(&bm); kOR5'rh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); oj*5m+:>a  
 tdc.SelectObject(pOld); <V)T_  
 BITMAP btm; R?3^Kx  
 bm.GetBitmap(&btm); S N_!o2F2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^S!^$d*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sl^i%xJ|l'  
 BITMAPINFOHEADER bih; ~5$V8yfx h  
 bih.biBitCount=btm.bmBitsPixel; )qs>Z?7  
 bih.biClrImportant=0; X~XpX7d!  
 bih.biClrUsed=0;  4"72  
 bih.biCompression=0; *=i|E7Irg  
 bih.biHeight=btm.bmHeight; J1DX}h]  
 bih.biPlanes=1; b*=eMcd  
 bih.biSize=sizeof(BITMAPINFOHEADER); PY7j uS[+  
 bih.biSizeImage=size; H&\Ig D  
 bih.biWidth=btm.bmWidth; clK3kBh~&  
 bih.biXPelsPerMeter=0; C!xqp   
 bih.biYPelsPerMeter=0; Z#.J>_u )  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D%k%kg0,  
 static int filecount=0; vtw{ A}  
 CString name; |0YDCMq(  
 name.Format("pict%04d.bmp",filecount++); [.;$6C/?  
 name=m_Path+name; FEgM4m.(G<  
 BITMAPFILEHEADER bfh; Ho[Kxe[c  
 bfh.bfReserved1=bfh.bfReserved2=0; +^$FA4<~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @$'k1f(u>  
 bfh.bfSize=54+size; w J FEua  
 bfh.bfOffBits=54; QCkPua9  
 CFile bf; p]=a:kd4J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [/ uqH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tWL3F?wd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OI;0dS  
  bf.WriteHuge(lpData,size); yQb^]|XG  
  bf.Close(); v3 4!rL  
  nCount++; 7eb^^a?  
 } %g7 !4  
 GlobalFreePtr(lpData); /h'V1zL#  
 if(nCount==1) 2\&uO   
  m_Number.Format("%d picture captured.",nCount); JSX-iHhW  
 else /CX_@%m}e=  
  m_Number.Format("%d pictures captured.",nCount); v-2_#  
  UpdateData(FALSE); hX4&B  
} Sz4YP l  
|@KW~YlE  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) uP bvN[~t  
{ |&Gm.[IX;q  
 if(pMsg -> message == WM_KEYDOWN) i-Ck:-J  
 { a$!|)+  
  if(pMsg -> wParam == VK_ESCAPE) `hYj0:*)S$  
   return TRUE; 9:zW$Gt&  
  if(pMsg -> wParam == VK_RETURN) ("UcjB^62  
   return TRUE; Wr"-~PP  
 } G3]TbU!!T  
 return CDialog::PreTranslateMessage(pMsg); E5"%-fAJ  
} d`9% :2qE  
j4H]HGHv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _r+2o-ZR  
{ $(pzh:|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *gMo(-tN  
  SaveBmp(); nDx}6}5)  
  return FALSE; <PL94  
} SwHrHj  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o/273I  
 CMenu pop; MKIX(r( |  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \zioIfHm  
 CMenu*pMenu=pop.GetSubMenu(0); >Qg`Us#y  
 pMenu->SetDefaultItem(ID_EXITICON); jyRSe^x  
 CPoint pt; -[A4B)  
 GetCursorPos(&pt); WVDkCo@  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); E0QrByr_  
 if(id==ID_EXITICON) )P    
  DeleteIcon(); vd`;(4i#X  
 else if(id==ID_EXIT) GUyMo@g  
  OnCancel(); Rn6;@Cw  
 return FALSE; Gkci_A*  
} sd|5oz )  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kj_ o I5<'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  =`fJ  
 AddIcon(); Dizc#!IGU  
 return res; >t_5( K4  
} 5e tbJk  
#(6^1S%  
void CCaptureDlg::AddIcon() uCGJe1!Ai>  
{ x=(y  
 NOTIFYICONDATA data; ]hY'A>4Uq  
 data.cbSize=sizeof(NOTIFYICONDATA); -0[?6.(s"  
 CString tip; C-Y~T;53  
 tip.LoadString(IDS_ICONTIP); %Wy$m?gD  
 data.hIcon=GetIcon(0); OxGKtnAjf  
 data.hWnd=GetSafeHwnd(); )/VhkSXbG!  
 strcpy(data.szTip,tip); 67Z@Hg  
 data.uCallbackMessage=IDM_SHELL; 5~GHAi  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #6O<!{PH6  
 data.uID=98; 1#rcxUSi  
 Shell_NotifyIcon(NIM_ADD,&data); r(=  
 ShowWindow(SW_HIDE); t"[ xx_i  
 bTray=TRUE; [Q(FBoI|  
} 49S*f  
LLp/ SWe  
void CCaptureDlg::DeleteIcon() /[ _aw&W}Z  
{ ^2C)Wk$  
 NOTIFYICONDATA data; -1'O  
 data.cbSize=sizeof(NOTIFYICONDATA); =[]V$<G'w{  
 data.hWnd=GetSafeHwnd(); @'UbTB!  
 data.uID=98; N<&"_jzm  
 Shell_NotifyIcon(NIM_DELETE,&data); pW{Q%"W  
 ShowWindow(SW_SHOW); O  |45r   
 SetForegroundWindow(); ?U+^ctwv7  
 ShowWindow(SW_SHOWNORMAL); {C+blzh6  
 bTray=FALSE; Wtl/xA_  
} Zj,1)ii  
>TZ 'V,  
void CCaptureDlg::OnChange() iveJh2!#<  
{ z4 GcS/3K  
 RegisterHotkey(); %eK=5Er jx  
} Sg#$ B#g  
x"/DCcZ  
BOOL CCaptureDlg::RegisterHotkey() k:1p:&*m  
{ 1< gY  
 UpdateData(); \<k5c-8Hb  
 UCHAR mask=0; gumT"x .^  
 UCHAR key=0; QH~;B[->  
 if(m_bControl)  AT@m_d  
  mask|=4; 7X+SK&PX  
 if(m_bAlt) SZVNu*G!H  
  mask|=2; K&T[F!  
 if(m_bShift) wm1`<r^M.  
  mask|=1; *`D}voU  
  key=Key_Table[m_Key.GetCurSel()]; IXjFK  
 if(bRegistered){ S87E$k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); DxuT23. (  
  bRegistered=FALSE; ^qB a~  
 } 9]u=b\fzZ  
 cMask=mask; %x}iEqkU  
 cKey=key; BQ8vg8e]B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); is?#wrV=K  
 return bRegistered; FA5|`  
} =|}_ASbzw  
5"~F#vt  
  四、小结 8PKUg "p  
80(Olf@PE  
  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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