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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: ;pu68N(B  
  Gqvnc8V&  
  一、实现方法 Z3E957}  
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  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: 7g1" s1~or  
ed$g=qs>  
#pragma data_seg("shareddata") U^<\'`  
HHOOK hHook =NULL; //钩子句柄 .8[B }S(  
UINT nHookCount =0; //挂接的程序数目 EMME?OW$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 iQsv^K!\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 a-\\A[E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pE(\q+1<  
static int KeyCount =0; gzDH~'8W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~_v?M%5i  
#pragma data_seg() 7Yp;B:5@  
[V'3/#Z  
  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。 m~Q]#r  
#;GIvfW  
  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: O<nJbsl_w  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR , |SO'dG  
cKey,UCHAR cMask) Wlm%W>%  
{ _%#Q \ D  
 BOOL bAdded=FALSE; V*P3C5 l  
 for(int index=0;index<MAX_KEY;index++){ QF:">G  
  if(hCallWnd[index]==0){ F#S^Q`  
   hCallWnd[index]=hWnd; ?d`?Ss;v  
   HotKey[index]=cKey; 0&$+ CWSM  
   HotKeyMask[index]=cMask; -N`j` zb|  
   bAdded=TRUE; ]eA<  
   KeyCount++; weCRhA  
   break; `c@KlL*!Q  
  } 2Wz/s 0`  
 } ~@=:I  
 return bAdded; h*2Q0GRX  
} gNr/rp9A$m  
//删除热键 X;ef&n`U0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z M"J5}h  
{ UEmNT9V  
 BOOL bRemoved=FALSE;  `=b)fE  
 for(int index=0;index<MAX_KEY;index++){ 3f9J! B`n  
  if(hCallWnd[index]==hWnd){ h _6QVab@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )2T?Z)"hO  
    hCallWnd[index]=NULL; xi=Z<G  
    HotKey[index]=0; H|>dF)%pj  
    HotKeyMask[index]=0; lV!ecJw$  
    bRemoved=TRUE; rqk1 F~j|  
    KeyCount--; kOR5'rh  
    break; 5_";EED  
   } =mV1jGqX  
  } 0] e=  
 } q:Gi Qk-  
 return bRemoved; )qs>Z?7  
} $(v1q[ig  
^G'8!!ys  
!fF1tW  
  DLL中的钩子函数如下: F-Mf~+=Dn  
g+BW~e)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \YO1;\W  
{ z VleJ!d  
 BOOL bProcessed=FALSE; [su2kOX|X  
 if(HC_ACTION==nCode) )@)wcf!b  
 { [f["9(:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "e62g  
   switch(wParam) ZY-UQ4_|u  
   {  $ hwJjSZ0  
    case VK_MENU: s6SG%Vd  
     MaskBits&=~ALTBIT;  e#0C  
     break; b0PqP<{t  
    case VK_CONTROL: !7ct=L  
     MaskBits&=~CTRLBIT; zOA{S~>  
     break; fis**f0  
    case VK_SHIFT: L?!*HS7 m  
     MaskBits&=~SHIFTBIT; $I&DAGV0  
     break; A-<\?13uW  
    default: //judge the key and send message '6i"pJ0%  
     break; Q?Vq/3K;  
   } 5D0O.v  
   for(int index=0;index<MAX_KEY;index++){ )70-q yA  
    if(hCallWnd[index]==NULL) ZrJAfd\5c  
     continue; 5 {cbcuG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6QVdnXoG/  
    { --E_s /   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d dB}mk6  
     bProcessed=TRUE; 8Z{&b,Y4L  
    } zs!,PQF(  
   } +O P8U]~  
  } ;&4}hPq  
  else if((lParam&0xc000ffff)==1){ //有键按下 E O^j,x g  
   switch(wParam) wi/Fx=w  
   { Pe[~kog,TP  
    case VK_MENU: fT1/@  
     MaskBits|=ALTBIT; ^(7<L<H  
     break; .s-X %%e\  
    case VK_CONTROL: V+My]9ki  
     MaskBits|=CTRLBIT; |fX @o0H  
     break; 71`)@y,Z,  
    case VK_SHIFT: ``?] 13XjK  
     MaskBits|=SHIFTBIT; dLl/V3C6t  
     break; `tKrTq>  
    default: //judge the key and send message LAqmM3{fA  
     break; Htd-E^/  
   } x*GGO)r  
   for(int index=0;index<MAX_KEY;index++){ @-y.Y}k#$~  
    if(hCallWnd[index]==NULL) Y?G9d6]Lk6  
     continue; h^ wu8E   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ST'M<G%4E  
    { \IB@*_G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  WK;X6`  
     bProcessed=TRUE; :%ms6j/B&V  
    } . 7WNd/WG  
   } yn=BO`sgW  
  } 4^h_n1 A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 e7X#C)  
   for(int index=0;index<MAX_KEY;index++){ |HhqWja  
    if(hCallWnd[index]==NULL) jG8W|\8  
     continue; Q;A1&UA2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  Er( I6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #6O<!{PH6  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ni]V)wGE;  
   } .}'49=c  
  } 7Gg3$E+#*  
 } dq d:V$o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;!H<W[  
} 2JY]$$K7  
~,j52obR6Z  
  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: epw*Px  
Mrpz(})  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UQZ<sp4v;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O  |45r   
(`C#Tq  
  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: Mf'T\^-!  
5]_m\zn=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?\|QDJXY  
{ KVQ^-^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  6/u]r  
 { c8uFLM j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Udj!y$?  
  SaveBmp(); =j,2  
  return FALSE; c3S}(8g5.  
 } T!-*;yu  
 …… //其它处理及默认处理 ~SKV%  
} e:W]B)0/e  
r 7 dwj  
z;T_%?u  
  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。 &6 ymGo  
*u J0ZO9  
  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。 =rL%P~0wq  
q<Tx'Ya  
  二、编程步骤 zG IxmJ.  
j!1 :+H_L  
  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"; S($8_u$U  
(^_j,4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &m{SWV+   
/\7E&n:)2  
  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; > nHaMj  
CjFnE   
  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; E;`@S  
"2l$}G  
  5、 添加代码,编译运行程序。 D*T*of G  
0^lCZ,uq;  
三、程序代码 c{"=p8F_  
CjRU3 (Q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =6.4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  _'Jz+f.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ww? AGd  
#if _MSC_VER > 1000 t,bQ@x{zVC  
#pragma once e]9Z]a2  
#endif // _MSC_VER > 1000 2}\/_Y6  
#ifndef __AFXWIN_H__ qV$\E=%fhM  
#error include 'stdafx.h' before including this file for PCH 1]&FB{l  
#endif QsemN7B "<  
#include "resource.h" // main symbols &':Ecmo~`  
class CHookApp : public CWinApp \iP=V3  
{ 2gasH11M  
 public: ID_#a9N  
  CHookApp(); }srmG|@:  
  // Overrides c1Rn1M,2k  
  // ClassWizard generated virtual function overrides ur$=%3vM  
  //{{AFX_VIRTUAL(CHookApp) \rpXG9  
 public:  `1`Qu!  
  virtual BOOL InitInstance(); aP ToP.e  
  virtual int ExitInstance(); 7g7[a/Bts  
  //}}AFX_VIRTUAL 7Gwo:s L  
  //{{AFX_MSG(CHookApp) @sdHB ./  
  // NOTE - the ClassWizard will add and remove member functions here. ?-v]+<$Y  
  // DO NOT EDIT what you see in these blocks of generated code ! {*PbD;/f  
  //}}AFX_MSG '.B5CQ  
  DECLARE_MESSAGE_MAP() VbI$#;:[7  
}; iSP}kM}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); XN&cM,   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +\R__tx;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?/}N  
BOOL InitHotkey(); ;5 p;i 8m  
BOOL UnInit(); wJc`^gj  
#endif ,;@v Vm'}  
-UoTBvObAm  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]r\FC\n6e  
#include "stdafx.h" d-cW47  
#include "hook.h" kNd(KQ<.17  
#include <windowsx.h> ^wIg|Gc  
#ifdef _DEBUG A\w"!tNM|  
#define new DEBUG_NEW h(K}N5`  
#undef THIS_FILE ucYweXsO3  
static char THIS_FILE[] = __FILE__; B#;6z%WK  
#endif dQs>=(|t  
#define MAX_KEY 100 &_$0lI DQ  
#define CTRLBIT 0x04 r_hs_n!6  
#define ALTBIT 0x02 ";U#aK1p  
#define SHIFTBIT 0x01 o- v#Zl  
#pragma data_seg("shareddata") X> T_Xc  
HHOOK hHook =NULL; a@S{ A5j  
UINT nHookCount =0; Kw7uUJR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0N87G}Xu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT k`((6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Q~f mVWq  
static int KeyCount =0; d:Oo5t)MN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ` 7P%muY.  
#pragma data_seg()  X`20=x  
HINSTANCE hins; m-2!r*(zt  
void VerifyWindow(); P''>wjMH0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,m Nd#  
//{{AFX_MSG_MAP(CHookApp) d{Cg3v`Rd  
// NOTE - the ClassWizard will add and remove mapping macros here. 9|WV28PK:  
// DO NOT EDIT what you see in these blocks of generated code! ][dst@?8Oz  
//}}AFX_MSG_MAP 60G(jO14  
END_MESSAGE_MAP() Alk+MwjR  
`t"7[Zk  
CHookApp::CHookApp() gHtflS  
{ f hjlt#  
 // TODO: add construction code here, H+ 7HD|GE  
 // Place all significant initialization in InitInstance (?x R<]~g*  
} y8ODoXk  
D<g d)  
CHookApp theApp; " ?Ux\)*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y(wb?86#W5  
{ ;efF]")  
 BOOL bProcessed=FALSE; xpJ=yxO  
 if(HC_ACTION==nCode) )UtK9;@"  
 { q2P_37  
  if((lParam&0xc0000000)==0xc0000000){// Key up PJO.^OsM  
   switch(wParam) C]Q`!e  
   { t$&'mJ_-w  
    case VK_MENU: y>X(GF^  
     MaskBits&=~ALTBIT; Px3I+VP  
     break; <@$+uZt+  
    case VK_CONTROL: \S_A e;  
     MaskBits&=~CTRLBIT; =q(?ALGc  
     break; . H}R}^  
    case VK_SHIFT: 29^(weT"]  
     MaskBits&=~SHIFTBIT; `MHixQ;j  
     break; Q@uWh:  
    default: //judge the key and send message )3WUyD*UZN  
     break; }9 ]7V<  
   } :PK2! 0nK  
   for(int index=0;index<MAX_KEY;index++){ _<GXR ?  
    if(hCallWnd[index]==NULL) '0=mV"#H{  
     continue; n?>|2>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `GSl}A  
    { qu\U^F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6!HYx  
     bProcessed=TRUE; -,+~W#n  
    } }5;/!P_A  
   } Ng2Z7k  
  } XmP,3KG2{S  
  else if((lParam&0xc000ffff)==1){ //Key down 8!b>[Nsc  
   switch(wParam) 0#NbAMt  
   { D~FIv  
    case VK_MENU: Y>T<Qn^D  
     MaskBits|=ALTBIT; ::_bEmk  
     break;  ^Kl*}  
    case VK_CONTROL: j/jFS]iC  
     MaskBits|=CTRLBIT; <J>k%,:B  
     break; dlA0&;}z  
    case VK_SHIFT: WL|<xNL  
     MaskBits|=SHIFTBIT; 9{}"tk5$h  
     break; dOK]Su  
    default: //judge the key and send message a)*(**e$*i  
     break; iaJLIrl  
   } H& $M/`  
   for(int index=0;index<MAX_KEY;index++)  6HPuCP  
   { *+k yuY J  
    if(hCallWnd[index]==NULL) l_4 ^TYF  
     continue; Cd ]g+R}j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P 'o]#Az  
    { ^ p7z3ng  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1>/ iYf  
     bProcessed=TRUE; Qp7F3,/#  
    } YCVT0d  
   } /x)i}M)  
  } @r^s70{}  
  if(!bProcessed){ iUFG!,+d  
   for(int index=0;index<MAX_KEY;index++){ x:Q$1&3N  
    if(hCallWnd[index]==NULL) 3ZbqZ"rE  
     continue; &JYkh >  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N{}8Zh4op  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (J?_~(,`"  
   } /bn$@Cy@  
  } F2MC)&#  
 } 4\ |/S@.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "bB0$>0,  
} %QQ 2u$  
K%_UNivN  
BOOL InitHotkey() .2U3_1dX  
{ =7#"}%4Q  
 if(hHook!=NULL){ "%bU74>  
  nHookCount++; t%O)Ti  
  return TRUE; #|3,DZ|)F  
 } f~,Ml*Zp  
 else D+jE{v'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S_ nAO\h  
  if(hHook!=NULL) JIjo^zOXsc  
   nHookCount++; l D->1=z  
  return (hHook!=NULL); ^QjkZ^<dD  
} (sI`FW_  
BOOL UnInit() hT,rcIkg:  
{ '? -N  
 if(nHookCount>1){ y>:U&P^  
  nHookCount--; `A5n6*A7  
  return TRUE; cs _  
 } M6 8foeeN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L0I |V[  
 if(unhooked==TRUE){ <CJy3<$u  
  nHookCount=0; "',;pGg|K  
  hHook=NULL; tSnsjd<6.  
 } y(/5l   
 return unhooked; =c$x xEDD  
} Q/]o'_[vW  
sxS%1hp3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @4Zkkjc4b  
{ Pd& Npp3  
 BOOL bAdded=FALSE; R^=v&c{@  
 for(int index=0;index<MAX_KEY;index++){ x4MTE?hT  
  if(hCallWnd[index]==0){ W8Wjq DQ  
   hCallWnd[index]=hWnd; I(WIT=Wi<  
   HotKey[index]=cKey; Y@< j vH1  
   HotKeyMask[index]=cMask; =}@1Z~  
   bAdded=TRUE; %!AzFL J|Z  
   KeyCount++; Vugb;5Vl  
   break; V rd16s  
  } sP}u  zS  
 } x%O6/rl  
 return bAdded; ,L.V>Ae  
} _"OE}$C  
'/OQ[f=K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )Z|G6H`c3  
{ QN?EI: q=  
 BOOL bRemoved=FALSE; j:>0XP  
 for(int index=0;index<MAX_KEY;index++){ R#.H&#  
  if(hCallWnd[index]==hWnd){ e2K9CE.O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &cd>.&1<2  
    hCallWnd[index]=NULL; p@Cas  
    HotKey[index]=0; KT*>OYI  
    HotKeyMask[index]=0; A0RSNAM  
    bRemoved=TRUE; FzP1b_i  
    KeyCount--; @/ nGc9h  
    break; : 2$*'{mM  
   } eX lJ=S}  
  } *W^a<Zm8>  
 } g HkHAOe/  
 return bRemoved; ?Bl/bY$*h  
} &r*F+gL  
()w;~$J  
void VerifyWindow() `S5::U6E  
{ Mu-kvgO`L  
 for(int i=0;i<MAX_KEY;i++){ }~NXiUe  
  if(hCallWnd!=NULL){ 4eG\>#5  
   if(!IsWindow(hCallWnd)){ 7&OJ8B/  
    hCallWnd=NULL; {IvA 5^  
    HotKey=0; )''V}Zn.X  
    HotKeyMask=0; }%jpqip  
    KeyCount--; ( ;^>G[  
   } IbJl/N%o  
  } Jw&Fox7p  
 } bBXLW}W  
} C@Go]*c  
S0gxVd(  
BOOL CHookApp::InitInstance() h^qZi@L  
{ F u^j- Io  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); b62B|0i  
 hins=AfxGetInstanceHandle(); Ctn?O~u  
 InitHotkey(); &l!T2PX!  
 return CWinApp::InitInstance(); olA+B  
} C^;8M'8z0  
r\FZ-gk}Q  
int CHookApp::ExitInstance() = &?&}pVF  
{ rly%+B `/  
 VerifyWindow(); HRjbGc|[  
 UnInit(); ~tV7yY|zr  
 return CWinApp::ExitInstance(); o)n)Z~  
} D/ sYH0.V$  
l?rLadvc  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file | 5:2?S2R  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o1?-+P/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }p)Hw2  
#if _MSC_VER > 1000 >SL mlK  
#pragma once p >ua{}!L  
#endif // _MSC_VER > 1000 -*~ @?  
vfvp#  
class CCaptureDlg : public CDialog J7- vB",U  
{ Lccy~2v>  
 // Construction *RVCz|0%w  
 public: *5*#Z~dut8  
  BOOL bTray; W[qy4\.B  
  BOOL bRegistered; rFkZ'rp74b  
  BOOL RegisterHotkey(); $pAVTz  
  UCHAR cKey; `?WN*__["  
  UCHAR cMask; aaw[ia_EL  
  void DeleteIcon(); 6&0G'PMf  
  void AddIcon(); ;H`@x Lv*  
  UINT nCount; |HYST`  
  void SaveBmp(); %6rSLBw3  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V9qA'k  
  // Dialog Data Oq,@{V@)9k  
  //{{AFX_DATA(CCaptureDlg) {:VK}w  
  enum { IDD = IDD_CAPTURE_DIALOG }; .taP2^2Z  
  CComboBox m_Key; G!=(^G@J;  
  BOOL m_bControl; ceD6q~)  
  BOOL m_bAlt; 'W4v>0   
  BOOL m_bShift; }YBuS3{  
  CString m_Path; -sZ'<(3  
  CString m_Number; Fw{#4  
  //}}AFX_DATA p~=z)7% e'  
  // ClassWizard generated virtual function overrides ov H'_'  
  //{{AFX_VIRTUAL(CCaptureDlg) s]0 J'UN  
 public: mCk_c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @ <2y+_e  
 protected: ;~djbo0,X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Uf ]$I`T#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nTD%i~t~o  
  //}}AFX_VIRTUAL 2p#d  
  // Implementation &z5?]`ALu  
 protected: S5, u| H  
  HICON m_hIcon; ebNRZJ?C,  
  // Generated message map functions m[Ihte->  
  //{{AFX_MSG(CCaptureDlg) 0*tnJB  
  virtual BOOL OnInitDialog(); DR3om;Uk  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "v`q%(TA  
  afx_msg void OnPaint(); mAGD qz>f  
  afx_msg HCURSOR OnQueryDragIcon(); lo'#dpt<  
  virtual void OnCancel(); Mp!1xx  
  afx_msg void OnAbout(); 0zT-]0  
  afx_msg void OnBrowse(); Q&w_kz.  
  afx_msg void OnChange(); &~/g[\Y  
 //}}AFX_MSG 2RF3pIFrm  
 DECLARE_MESSAGE_MAP() L kl E,W  
}; ]v),[]Xs  
#endif +/eJ#Xw3u8  
Y3FFi M[s~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \v\ONp"  
#include "stdafx.h" t?)]xS)  
#include "Capture.h" 8v8-5N  
#include "CaptureDlg.h" -!qjBK,`X  
#include <windowsx.h> NIQ}+xpC  
#pragma comment(lib,"hook.lib") :AFU5mR4&  
#ifdef _DEBUG T ,!CDm$=  
#define new DEBUG_NEW u,`3_I^  
#undef THIS_FILE GHn0(o&K  
static char THIS_FILE[] = __FILE__; { pQJ.QI  
#endif Qt{V&Z7  
#define IDM_SHELL WM_USER+1 `AvK8Wh<+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5 -|7I7(G$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nvLdgu4P>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <pa-C2Ky  
class CAboutDlg : public CDialog d}Guj/cx,  
{ N%Y!{k5T7  
 public: ohyq/u+y~A  
  CAboutDlg(); pO5j-d *  
  // Dialog Data S^|`*%pq  
  //{{AFX_DATA(CAboutDlg) qzA_ ~=g  
  enum { IDD = IDD_ABOUTBOX }; )B&`<1Oie  
  //}}AFX_DATA +zk5du^gZ  
  // ClassWizard generated virtual function overrides wme#8/eUk  
  //{{AFX_VIRTUAL(CAboutDlg) 4guR8 elM  
 protected: t\ z@k9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &=M4Z/Ao  
  //}}AFX_VIRTUAL w/*#TDR  
  // Implementation }a, ycFt  
 protected: cC/32SmY4  
  //{{AFX_MSG(CAboutDlg) sq(5k+y*J  
  //}}AFX_MSG u$zRm(!RB  
  DECLARE_MESSAGE_MAP() tN4&#YK<  
}; Sw; kUJ  
Fq <JxamR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I~YV&12  
{ i M MKA0JM  
 //{{AFX_DATA_INIT(CAboutDlg) j7a }<\  
 //}}AFX_DATA_INIT _unoDoB  
} [\<#iRcP  
8au Gz ,"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mOHOv61  
{ pCo3%(  
 CDialog::DoDataExchange(pDX); "fhQ{b$i  
 //{{AFX_DATA_MAP(CAboutDlg) YIZu{  
 //}}AFX_DATA_MAP <A|z   
} 6LCR ;~ ]  
<8? F\x@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &nVekE:!  
 //{{AFX_MSG_MAP(CAboutDlg) C@]D*k  
 // No message handlers Bfo#N31F}  
 //}}AFX_MSG_MAP Whp`\E< <  
END_MESSAGE_MAP() jck(cc= R  
{g`!2"  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +]-'{%-zK  
: CDialog(CCaptureDlg::IDD, pParent) ia; osqW  
{ L >"O[@  
 //{{AFX_DATA_INIT(CCaptureDlg) m{Uh{G$  
  m_bControl = FALSE; n/*" 2  
  m_bAlt = FALSE; qa@;S,lp  
  m_bShift = FALSE; SDSP4W5  
  m_Path = _T("c:\\"); tq~f9EvC  
  m_Number = _T("0 picture captured."); GhcH"D%-  
  nCount=0; S *J{  
  bRegistered=FALSE; Wtk|}>Pf  
  bTray=FALSE; 5%QYe]D  
 //}}AFX_DATA_INIT 2^Im~p~ByE  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 p$x>I3C(\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I8T*_u^_  
} Ah@e9`_r  
[Y.JC'F#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) h`O$L_Z  
{ '-n Iy$>  
 CDialog::DoDataExchange(pDX); F !OD*]  
 //{{AFX_DATA_MAP(CCaptureDlg) `^on`"\{u  
  DDX_Control(pDX, IDC_KEY, m_Key); :6)!#q'g  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZBx,'ph}4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F 2zUz[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X6$Cd]MN  
  DDX_Text(pDX, IDC_PATH, m_Path); HOH5_E>d  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }aa]1X(u  
 //}}AFX_DATA_MAP /g9^g(  
} \8\T TkVSq  
3*j1v:x`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) CH!\uK22  
//{{AFX_MSG_MAP(CCaptureDlg) nm%qm  
 ON_WM_SYSCOMMAND() m1]/8{EC7  
 ON_WM_PAINT() e&8Meiv+d  
 ON_WM_QUERYDRAGICON() NRP) 'E  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  lFcHE c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A/}[Z\C  
 ON_BN_CLICKED(ID_CHANGE, OnChange) j"TEp$x  
//}}AFX_MSG_MAP CKFr9bT{  
END_MESSAGE_MAP() Iix:Y}  
{&D$U'ye  
BOOL CCaptureDlg::OnInitDialog() O0BDUpH  
{ -Q Mwtr#q}  
 CDialog::OnInitDialog(); G)b:UJa"  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +8 \?7,FY  
 ASSERT(IDM_ABOUTBOX < 0xF000); EW4a@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); IUh9skW5  
 if (pSysMenu != NULL) *0L3#. i  
 { `}uM91;  
  CString strAboutMenu; d!Y%7LmSE@  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yV L >Ie/  
  if (!strAboutMenu.IsEmpty()) . 8ikcs  
  { ^!k_"C)B  
   pSysMenu->AppendMenu(MF_SEPARATOR); "7Kw]8mRR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =u0a/2u|  
  } VJW8%s[  
 } @V1FBw9S!@  
 SetIcon(m_hIcon, TRUE); // Set big icon Ygg(qB1q  
 SetIcon(m_hIcon, FALSE); // Set small icon QKvaTy#  
 m_Key.SetCurSel(0); uX{g4#eG  
 RegisterHotkey(); /4+zT?f  
 CMenu* pMenu=GetSystemMenu(FALSE); I~p*~mLh'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Lr\(7r  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )w&|VvM )L  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O5+Ah%  
 return TRUE; // return TRUE unless you set the focus to a control }z\t}lven  
} ' Gx\  
*M:p[.=1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !{(crfXB  
{ <~v4BiQ3l^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6MU;9|&  
 { +:70vZc:V@  
  CAboutDlg dlgAbout; A>S7Ap4z>  
  dlgAbout.DoModal(); 7oUo[  
 } 7T!t*sSO'  
 else eW3?3l`fvt  
 { #_3-(H5u  
  CDialog::OnSysCommand(nID, lParam); F2<Q~gQ;  
 } 3|G~_'`RLt  
} 9<P%?Q  
asp\4-?$o  
void CCaptureDlg::OnPaint() e(1{W P  
{ wkPomTO  
 if (IsIconic()) }lJ|nl`c  
 { eDNY|}$}v  
  CPaintDC dc(this); // device context for painting HJ"sK5Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D(TfW   
  // Center icon in client rectangle <bhJ>  
  int cxIcon = GetSystemMetrics(SM_CXICON); >nK (  
  int cyIcon = GetSystemMetrics(SM_CYICON); RASk=B  
  CRect rect; MOB'rPIUI  
  GetClientRect(&rect); }y+a )2  
  int x = (rect.Width() - cxIcon + 1) / 2; OzRo  
  int y = (rect.Height() - cyIcon + 1) / 2; w+!V,lU"^  
  // Draw the icon :l Z\=2D  
  dc.DrawIcon(x, y, m_hIcon); 8/,s 8u  
 } } MP_  
 else \fUVWXv  
 { B"*PBJuOA  
  CDialog::OnPaint(); ga;t`5+d  
 } k!+v*+R+V  
} 7pep\  
}PDtx:T-  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9nlj{(  
{ $}YN`:{  
 return (HCURSOR) m_hIcon; ]:?hU^H]<  
} hA&m G33  
%){/O}I]>  
void CCaptureDlg::OnCancel() -,mV~y  
{ [,~;n@jz  
 if(bTray) J]48th0,  
  DeleteIcon(); t0:~BYXu  
  CDialog::OnCancel(); +>a(9r|:  
} es+ZPX>Y  
L!ms{0rJ  
void CCaptureDlg::OnAbout() * "?,.  
{ OMYbCy^  
 CAboutDlg dlg; { M[iYFg=  
 dlg.DoModal(); B4m34)EOE  
} =PjdL3 2  
>%t5j?p  
void CCaptureDlg::OnBrowse() i8R 2Y9Q*O  
{ lq  Av  
 CString str; Nlc3S+$`z  
 BROWSEINFO bi; =G'J@[d{d  
 char name[MAX_PATH]; 0PUSCka'6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~_-+Q=3  
 bi.hwndOwner=GetSafeHwnd(); oVfRp.a  
 bi.pszDisplayName=name; EWVn*xl?  
 bi.lpszTitle="Select folder"; iE{VmHp=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /B{c L`<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ('=Q[ua7-(  
 if(idl==NULL) poqNiOm4%  
  return; HGj[\kU~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?#ywUEY* i  
 str.ReleaseBuffer(); y,<\d/YY@  
 m_Path=str; "*d%el\63  
 if(str.GetAt(str.GetLength()-1)!='\\') %]F{aR  
  m_Path+="\\"; /KO2y0`  
 UpdateData(FALSE); ?i~mt'O  
} 7~D5Gy  
nK]L0*s  
void CCaptureDlg::SaveBmp() f~p[izt  
{ bD 1IY1  
 CDC dc; @_;vE(!5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); JVPLE*T  
 CBitmap bm; i^}DIx{  
 int Width=GetSystemMetrics(SM_CXSCREEN); :pP l|"  
 int Height=GetSystemMetrics(SM_CYSCREEN); $f6wmI;<y  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  ~}K$z  
 CDC tdc; >lO]/3j1  
 tdc.CreateCompatibleDC(&dc); T(+*y  
 CBitmap*pOld=tdc.SelectObject(&bm); f2Tz5slE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I[LHJ4  
 tdc.SelectObject(pOld); TP=#U^g*  
 BITMAP btm; Hegj_FQ  
 bm.GetBitmap(&btm); !T]bz+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~llw_ w  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jrYA5>=>#  
 BITMAPINFOHEADER bih; 0IbR>zFg.  
 bih.biBitCount=btm.bmBitsPixel; oi^pU  
 bih.biClrImportant=0; U,~Z2L  
 bih.biClrUsed=0; sbFA{l3   
 bih.biCompression=0; Reg%ah|$/=  
 bih.biHeight=btm.bmHeight; R&L^+?  
 bih.biPlanes=1; ,L(q/#p  
 bih.biSize=sizeof(BITMAPINFOHEADER); {w9GMqq  
 bih.biSizeImage=size; 3 k)P*ME#  
 bih.biWidth=btm.bmWidth; KKwJ=za  
 bih.biXPelsPerMeter=0; ~\7peH%  
 bih.biYPelsPerMeter=0; zids2/_*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <r8s= <:  
 static int filecount=0; U+ief?;4F  
 CString name; 2wYY0=k2  
 name.Format("pict%04d.bmp",filecount++); hOcVxSc.  
 name=m_Path+name; glNXamo  
 BITMAPFILEHEADER bfh; { %af  
 bfh.bfReserved1=bfh.bfReserved2=0; - I j  
 bfh.bfType=((WORD)('M'<< 8)|'B'); mS-{AK  
 bfh.bfSize=54+size; 1jj.oa]  
 bfh.bfOffBits=54; +"[}gss!@  
 CFile bf; gG,gL 9o  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){  'v&f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]y/!GFQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {UOR_Vt!*  
  bf.WriteHuge(lpData,size); =>)4>WT8A  
  bf.Close(); /p[lOg  
  nCount++; Sh o] ~)XX  
 } t1]sv VX,w  
 GlobalFreePtr(lpData); 4VlQN$  
 if(nCount==1) PZCOJK  
  m_Number.Format("%d picture captured.",nCount); T_4y;mf!@O  
 else )Yw m_f-N  
  m_Number.Format("%d pictures captured.",nCount); .RWKZB  
  UpdateData(FALSE); |z.Z='`  
} OQby=}A  
zVtNT@1K>u  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kQ $.g<  
{ 1}I%yOi)  
 if(pMsg -> message == WM_KEYDOWN) ?\T):o;/  
 { lRA!  
  if(pMsg -> wParam == VK_ESCAPE) 83gp'W{|  
   return TRUE; 2S_7!|j  
  if(pMsg -> wParam == VK_RETURN) VaFv%%w  
   return TRUE; H=>;M j  
 } Xx=c'j<  
 return CDialog::PreTranslateMessage(pMsg); :|E-Dx4F6H  
} P }$DCD<$U  
aQ.mvuMa7'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Qj/.x#T  
{ FTZaN1%`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oxgh;v*  
  SaveBmp(); UhF+},gU  
  return FALSE; =%G<S'2'  
} )|i]"8I  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ADVHi3b  
 CMenu pop; P{h$> 6c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); c=\H&x3X  
 CMenu*pMenu=pop.GetSubMenu(0); .VfBwTh7q8  
 pMenu->SetDefaultItem(ID_EXITICON); OLgW .j:Ag  
 CPoint pt; [n9X5qG~  
 GetCursorPos(&pt); Q.])En >i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~;B@ {kFY)  
 if(id==ID_EXITICON) F\hU V[  
  DeleteIcon(); b:>t1S Ul  
 else if(id==ID_EXIT) FaE,rzn)iD  
  OnCancel(); LuUfdzH  
 return FALSE; KZt4 dr  
} xO` O$ie  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Oxhc!9F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dQH9NsV7g  
 AddIcon(); P[bj {lo  
 return res; J+20]jI  
} #[aHKq:?b  
I^yInrRh5  
void CCaptureDlg::AddIcon() uf&Ke k,  
{ K trR+ :  
 NOTIFYICONDATA data; fp2.2 @[  
 data.cbSize=sizeof(NOTIFYICONDATA); I2<t?c:Pn<  
 CString tip; 0!!z'm3  
 tip.LoadString(IDS_ICONTIP); v d}Y$X  
 data.hIcon=GetIcon(0); I~P]_D mM  
 data.hWnd=GetSafeHwnd(); r1QLSD]i6  
 strcpy(data.szTip,tip); j @+QwZL|  
 data.uCallbackMessage=IDM_SHELL; )]a{cczL"  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; c2fbqM~  
 data.uID=98; %Ut7%obpi  
 Shell_NotifyIcon(NIM_ADD,&data); gls %<A{C  
 ShowWindow(SW_HIDE); '-5Q>d~&h  
 bTray=TRUE; f-/zR%s{  
} .q7|z3@,  
WT9 k85hqj  
void CCaptureDlg::DeleteIcon() )=c/{  
{ VOK0)O>&  
 NOTIFYICONDATA data; 9Jhc5G  
 data.cbSize=sizeof(NOTIFYICONDATA); ('7qJkV  
 data.hWnd=GetSafeHwnd(); #:n:3]t  
 data.uID=98; j* \gD  
 Shell_NotifyIcon(NIM_DELETE,&data); zw,=mpf3_  
 ShowWindow(SW_SHOW); V]$J&aD  
 SetForegroundWindow(); vfZ.js/  
 ShowWindow(SW_SHOWNORMAL); D 4fHNk)kZ  
 bTray=FALSE; 8KrqJN0\  
} ekx~svcC&A  
\9}RAr#2]N  
void CCaptureDlg::OnChange() i[d@qp!H=  
{ @mB*fl?-  
 RegisterHotkey(); BLs kUrPF  
} @z!|HLD+  
2En^su$  
BOOL CCaptureDlg::RegisterHotkey() [ym ynr3M  
{ b _#r_`  
 UpdateData(); b/eJEL  
 UCHAR mask=0; /^TXGc.  
 UCHAR key=0; .Q^8 _'ZG  
 if(m_bControl)  "0( _  
  mask|=4; 20XN5dTFT  
 if(m_bAlt) ggn:DE "  
  mask|=2; a*gzVE7W#n  
 if(m_bShift) @3F4Lg6H|  
  mask|=1; p Y[dJxB  
  key=Key_Table[m_Key.GetCurSel()]; c8cPGm#i  
 if(bRegistered){ vUU)zZB ~  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); i{ " g 7  
  bRegistered=FALSE; :n} NQzs  
 } 2!+saf^-,  
 cMask=mask; m$X0O_*A  
 cKey=key; qz .{[ l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +7]]=e<[E  
 return bRegistered; g~i%*u,Y<  
} +jPs0?}s  
[9S?  
  四、小结 zJ2dPp~u  
 aX'R&R  
  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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