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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: hp7ni1V  
  (KvN#d 1\  
  一、实现方法 %Zfh6Bl\X  
U3M;{_g  
  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: 5ff5M=M  
1} _<qk9  
#pragma data_seg("shareddata") 1?"Zrd  
HHOOK hHook =NULL; //钩子句柄 1x sJz^%V  
UINT nHookCount =0; //挂接的程序数目 ;<cCT!A  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  "}[ ]R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OB+cE4$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |1<B(iB'{/  
static int KeyCount =0; >h9~ /  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ljg6uz1v %  
#pragma data_seg() d;3f80Kd*  
^"uD:f)  
  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。 n"~K",~P  
l r~>!O  
  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: 8@6*d.+e  
u2':~h?l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c*(=Glzn  
cKey,UCHAR cMask) rc`Il{~k  
{ !0Ak)Q]e'  
 BOOL bAdded=FALSE; A-^B ?E  
 for(int index=0;index<MAX_KEY;index++){ hsK(09:J  
  if(hCallWnd[index]==0){ E1A5<^t  
   hCallWnd[index]=hWnd; O|9Nl*rXz  
   HotKey[index]=cKey; q}E'x/s2m  
   HotKeyMask[index]=cMask; UpiZd/K  
   bAdded=TRUE; IG%x(\V-e  
   KeyCount++; Sl \EPKZD  
   break; FELW?Q?k  
  } ,&@FToR  
 } h,/3 }  
 return bAdded; a94 nB  
} Jcp=<z*0  
//删除热键 20A:,pMb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p-z!i+  
{ (f* r  
 BOOL bRemoved=FALSE; AO7X-,  
 for(int index=0;index<MAX_KEY;index++){ 7 lq$PsC  
  if(hCallWnd[index]==hWnd){ J|z' <W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?Qpi(Czbpq  
    hCallWnd[index]=NULL; %yR 80mn8  
    HotKey[index]=0; @ L/i  
    HotKeyMask[index]=0; -H 5-6w$  
    bRemoved=TRUE; 3m~3l d  
    KeyCount--; *JWPt(bnI  
    break; kWbY&]ZO  
   } (5RZLRn  
  } )R@Y$*fm  
 } )1)&fN41i#  
 return bRemoved; f\:I1y  
} Z#GR)jb+  
L'"od;(6R  
0U2dNLc  
  DLL中的钩子函数如下: mm | *  
])zpx-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Wx8 cK=  
{ LH~ t5  
 BOOL bProcessed=FALSE; a=[|"J<M  
 if(HC_ACTION==nCode) 1u* (=!  
 { On@p5YRwW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^<aj~0v  
   switch(wParam) Ds8x9v)^  
   {  %VrMlG4hx  
    case VK_MENU: 2T"[$iH!7  
     MaskBits&=~ALTBIT; PJh97%7  
     break; `KP}pi\  
    case VK_CONTROL:  sJ_3tjs)  
     MaskBits&=~CTRLBIT; kPnuU!  
     break; ]/mRMm9"3h  
    case VK_SHIFT: Yp $@i20  
     MaskBits&=~SHIFTBIT; w#sP5qKv8  
     break; S~y.>X3"P  
    default: //judge the key and send message t.7_7`bin~  
     break; $bk_%R}s  
   } A&Q!W)=  
   for(int index=0;index<MAX_KEY;index++){ Ez>!%Hpn\  
    if(hCallWnd[index]==NULL) sgB|2cj;j  
     continue; l-'\E6grdH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?&b"/sRS  
    { z)*\njYe  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1| xKb (_l  
     bProcessed=TRUE; OJLyqncw  
    } A+hT2Ew@t}  
   } ksqb& ux6  
  } fp"GdkO#}i  
  else if((lParam&0xc000ffff)==1){ //有键按下 R1:7]z0B  
   switch(wParam) DEenvS`,P  
   { >LFj@YW_)  
    case VK_MENU: Nw3IDy~T  
     MaskBits|=ALTBIT; i32S(3se  
     break; rT{ 2  
    case VK_CONTROL: CyJZip  
     MaskBits|=CTRLBIT; T"Nnl(cO_  
     break; R9Y{kk0M  
    case VK_SHIFT: JaJyH%+$!  
     MaskBits|=SHIFTBIT; &([yI>%  
     break; z|N*Gs>,  
    default: //judge the key and send message CDFkH  
     break; p?+;[!:  
   } CWE^:kr6  
   for(int index=0;index<MAX_KEY;index++){ 0h"uJco,  
    if(hCallWnd[index]==NULL) ${7s"IX  
     continue; 71HrpTl1fw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WQY\R!+  
    { '/F~vSQsR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o@|kq1m8  
     bProcessed=TRUE; !p 70g0+  
    } xb^M33-y  
   } }ev+WIERQV  
  } (/J %Huy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zS}!87r)  
   for(int index=0;index<MAX_KEY;index++){ @<p9 O0  
    if(hCallWnd[index]==NULL) Qlhm:[  
     continue; Eqt>_n8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2!Pwg0%2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2{)<Df@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 V5d|Lpm  
   } R #m1Aa  
  } FHZQyO<|  
 } <Ow+LJWQK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h &IF ?h  
} 9!vimu)  
#r80FVwiD  
  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: G4,BcCPQ  
`AELe_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?Q}3X-xy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <``krPi  
DOW Z hD  
  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: Z , 98  
:J6FI6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }+ TA+;  
{ s Qa9M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )Z@hk]@?_[  
 { fH;lh-   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Oat #%  
  SaveBmp(); %lN4"jtx  
  return FALSE; jD_B&MQz  
 } IS }U2d,W  
 …… //其它处理及默认处理 O:[@?l  
} \1#!% I=.  
AKKVd% P(  
3+:uV  
  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。 ltXGm)+  
[[8h*[:  
  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。 wEbO|S+K1  
\&%y4=y<sE  
  二、编程步骤 v!rOT/I  
H?dEgubg7]  
  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"; ZvW&%*k=  
O9MBQNwjA  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; VV=6v;u`  
]hA]o7 k  
  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; LfG$?<}hR  
R~XNF/QMl  
  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; I$Fr8R$  
~2?UEv6  
  5、 添加代码,编译运行程序。 &Zm1(k6&K  
/)xQ# yfX  
三、程序代码 0:k MnHn\  
0XrOOYmx  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Hbz,3{o5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) L~L]MC&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ M% FKg/  
#if _MSC_VER > 1000 3x~AaC.j  
#pragma once ("j*!Dsd  
#endif // _MSC_VER > 1000 [fXC ;c1  
#ifndef __AFXWIN_H__ #Xd#Nc j  
#error include 'stdafx.h' before including this file for PCH =`BPGfC b  
#endif Ix|^c268o<  
#include "resource.h" // main symbols ~dj4Q eu  
class CHookApp : public CWinApp .2STBh.;  
{ jQ\/R~)O  
 public: B?<Z(d7  
  CHookApp(); OL$^7FB  
  // Overrides 3ocRq %%K  
  // ClassWizard generated virtual function overrides +N!!Z2  
  //{{AFX_VIRTUAL(CHookApp) %p.hwgvnp  
 public: O7tL,)Vv  
  virtual BOOL InitInstance(); -`e`U%n  
  virtual int ExitInstance(); [$(/H;  
  //}}AFX_VIRTUAL {Ng HH]]O  
  //{{AFX_MSG(CHookApp) ZlsdO.G  
  // NOTE - the ClassWizard will add and remove member functions here. s2\6\8Ipn  
  // DO NOT EDIT what you see in these blocks of generated code ! H3" D$Nv  
  //}}AFX_MSG v_ W03\  
  DECLARE_MESSAGE_MAP() Y@M l}43  
}; "]{"4qV1=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8\ WOss)al  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cK+y3`.0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r=pb7=M#LN  
BOOL InitHotkey(); &>o?0A6  
BOOL UnInit(); "J6 aU  
#endif lIF*$#`oh*  
{uMqd-Uu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. FUU/=)^P$  
#include "stdafx.h" J*CfG;Y:  
#include "hook.h" @](\cT64i3  
#include <windowsx.h> r<L>~S>yb  
#ifdef _DEBUG 7Ke#sW.HN  
#define new DEBUG_NEW Ty>g:#bogI  
#undef THIS_FILE V{G9E  
static char THIS_FILE[] = __FILE__; 4 jeUYkJUM  
#endif Pxm~2PAm  
#define MAX_KEY 100 i#y3QCNqf^  
#define CTRLBIT 0x04 6J%+pt[tu  
#define ALTBIT 0x02 j{a3AEmps  
#define SHIFTBIT 0x01 iVGc\6+'  
#pragma data_seg("shareddata") k/ ZuFTN  
HHOOK hHook =NULL; 9d!}]+"d42  
UINT nHookCount =0; #T8$NZA  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4$!iw3N(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 5&*B2ZBzH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6M758K6v  
static int KeyCount =0; )<1}`9G  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |K6hY-uC  
#pragma data_seg() y:+s*x6Vg  
HINSTANCE hins; s%R'c_cGZ  
void VerifyWindow(); ~h*p A8^L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U1^R+ *yp  
//{{AFX_MSG_MAP(CHookApp) `L=$ ,7`  
// NOTE - the ClassWizard will add and remove mapping macros here. S4Vv _k-&  
// DO NOT EDIT what you see in these blocks of generated code! sZhl.[&zo  
//}}AFX_MSG_MAP QWBQ 0#L  
END_MESSAGE_MAP() \aO.LwYm;:  
]xIfgSq  
CHookApp::CHookApp() [#R<Z+c  
{ NCM&6<_  
 // TODO: add construction code here, : Gz#4k  
 // Place all significant initialization in InitInstance r?=7#/]  
} ly] n2RK  
~|~j01#  
CHookApp theApp; /M "E5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '{:Yg3K  
{ MrA&xM  
 BOOL bProcessed=FALSE; !*gTC1bvB  
 if(HC_ACTION==nCode) e r;3TG~  
 { 88ydAx#P  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^L<*ggw  
   switch(wParam) IFY,j8~q  
   { S qQqG3F  
    case VK_MENU: sm>Hkci%  
     MaskBits&=~ALTBIT; k(;c<Z{?1  
     break; ^f,('0p- >  
    case VK_CONTROL: P2Ja*!K]  
     MaskBits&=~CTRLBIT; vK\;CSk  
     break; y[l19eU  
    case VK_SHIFT: RZ[r XV5  
     MaskBits&=~SHIFTBIT; cKX6pG  
     break; 1Bz'$u;  
    default: //judge the key and send message ,{{uRs/  
     break; F W# S.<  
   } ]{[VTjC7rY  
   for(int index=0;index<MAX_KEY;index++){ :>[;XT<  
    if(hCallWnd[index]==NULL) 5)yQrS !{:  
     continue; }hFjl4`xa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4{\h53j$  
    { z.[ Ok  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $[Fh|%\  
     bProcessed=TRUE; ntSPHK|'  
    } sS$- PX C  
   } {[4Y(l1  
  } ;6} *0V_!k  
  else if((lParam&0xc000ffff)==1){ //Key down |j i}LWcD  
   switch(wParam) kgz2/,  
   { ?6 "F.\ O@  
    case VK_MENU: %Iv0<oU  
     MaskBits|=ALTBIT; s.rS06x  
     break; mdOF0b%-]  
    case VK_CONTROL: 'H`_Z e<  
     MaskBits|=CTRLBIT; 9zkR)C  
     break; y\Z-x  
    case VK_SHIFT: 8fdK|l w  
     MaskBits|=SHIFTBIT; %&"_=Lc  
     break; 1!/ U#d"  
    default: //judge the key and send message AX%9k  
     break; +mP3 y~|-j  
   } BcT|TX+ct  
   for(int index=0;index<MAX_KEY;index++) 1Ly?XNS  
   { T!hU37g h?  
    if(hCallWnd[index]==NULL) 2 f]9I1{  
     continue; NDRk%_Eu(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O329Bkg  
    { A]{8 =  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &Sc}3UI/F  
     bProcessed=TRUE; MWCP/~>a2  
    } C<6IiF[>%  
   } 3Nh;^  
  } VYhZ0;' '  
  if(!bProcessed){ {nbD5 ?   
   for(int index=0;index<MAX_KEY;index++){ E YUr.#:  
    if(hCallWnd[index]==NULL) ,7pO-:*g  
     continue; 1GW=QbO 6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '8>#`Yba  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T"Wq:  
   } )*^PMf  
  } 4kA/W0 VG  
 } Lvc*L6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0=s+bo1  
} z1LATy  
cJm!3X  
BOOL InitHotkey() eR8qO"%2:  
{ 8*)zoT*A  
 if(hHook!=NULL){ $Tq-<FbM)  
  nHookCount++; y-"*[5{W  
  return TRUE; Gr#p QE2;  
 } u:N/aaU=  
 else ^G# =>&,  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %.b)%=  
  if(hHook!=NULL) ;=Bf&hY&  
   nHookCount++; -Tk~c1I#`  
  return (hHook!=NULL); ;2}0Hr'|  
} 6[c LbT0  
BOOL UnInit() $+ZO{ (  
{ tGD$cBE  
 if(nHookCount>1){ 0ldde&!p  
  nHookCount--; g?i_10Xlp  
  return TRUE; `a2Oj@jP  
 } C>@~W(IE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g=[ F W@z  
 if(unhooked==TRUE){ qrNW\ME  
  nHookCount=0; (^9q7)n  
  hHook=NULL; ^#S  
 } S]1+tj  
 return unhooked; [8SW0wsk  
} cCU'~  
OR( )D~:n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }<&g1x'pa  
{ Qkk~{OuC  
 BOOL bAdded=FALSE; :H\6wJ  
 for(int index=0;index<MAX_KEY;index++){ z0HCmj9T  
  if(hCallWnd[index]==0){ Os8]iNvW\  
   hCallWnd[index]=hWnd; 8R:H{)o~s}  
   HotKey[index]=cKey; r#]gAG4t\  
   HotKeyMask[index]=cMask; uHQJ&  
   bAdded=TRUE; 42Vy#t/HC  
   KeyCount++; *s?&)][  
   break; 8{JTR|yB  
  } : O t\l  
 } h.4;-&  
 return bAdded; oRy?Dx+H  
} & HphE2 h  
dlK#V)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %o#D"  
{  X\ \\RCp  
 BOOL bRemoved=FALSE; N(}7M~m>  
 for(int index=0;index<MAX_KEY;index++){ 0wZLkU_(  
  if(hCallWnd[index]==hWnd){ ?GD{}f33  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ozkN&0  
    hCallWnd[index]=NULL; rgIJ]vmy<H  
    HotKey[index]=0; R`ZU'|  
    HotKeyMask[index]=0; <W/-[ M  
    bRemoved=TRUE; F^T7u?^)  
    KeyCount--; J`}/+WN7  
    break; 68)z`JI|<)  
   } (LRv c!`"  
  } b\gl9"X  
 } '|4/aHU  
 return bRemoved; TR{8A^XhE8  
} \#2,1W@  
?_W "=WpC  
void VerifyWindow() D}cq_|mmn[  
{ G5=(3V%  
 for(int i=0;i<MAX_KEY;i++){ 1(hgSf1WH  
  if(hCallWnd!=NULL){ qJ"dkT*  
   if(!IsWindow(hCallWnd)){ ^67P(h  
    hCallWnd=NULL; $NG}YOP)@  
    HotKey=0; `z5j  
    HotKeyMask=0; B Ibcm,YQ  
    KeyCount--; uTP=kgYqJ  
   } jDgiH}  
  } ^bL.|vB  
 } eiP>?8  
} )@1_Dm@0b  
pwd7I  
BOOL CHookApp::InitInstance() wm*`  
{ kZ`60X%wE  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); b |m$ W  
 hins=AfxGetInstanceHandle(); 8DLR  
 InitHotkey();  U@m<  
 return CWinApp::InitInstance(); \~jt7 Q  
} v]U[7 j  
>0@X^o  
int CHookApp::ExitInstance() "H%TOk7l  
{ CL9p/PJ%e  
 VerifyWindow(); evg i\"  
 UnInit(); z~o%U&DO}  
 return CWinApp::ExitInstance(); AZl|; y  
} >\} 2("bv  
lJKhP  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N1P [&lR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k@4]s_2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `x6 i5mp  
#if _MSC_VER > 1000 N<Y-]xS  
#pragma once '9<Mk-Aj  
#endif // _MSC_VER > 1000 Ez<J+#)t  
^"6xE nA]  
class CCaptureDlg : public CDialog 'n!;7*  
{ R*Pfc91}  
 // Construction YIgzFt[L  
 public: ] =>vv;L  
  BOOL bTray; ;?zb (2  
  BOOL bRegistered; ((EN&X,v  
  BOOL RegisterHotkey(); C"IPCJYn  
  UCHAR cKey; 0~Yg={IKhK  
  UCHAR cMask; |`qur5h`  
  void DeleteIcon(); ?PyI#G   
  void AddIcon(); /o8`I m   
  UINT nCount; k[Uc _=  
  void SaveBmp(); Ik;~u8j1e  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4X#>;  
  // Dialog Data @YpA'cX7  
  //{{AFX_DATA(CCaptureDlg) =,gss&J!!  
  enum { IDD = IDD_CAPTURE_DIALOG }; _QY0j%W  
  CComboBox m_Key; 8"8sI  
  BOOL m_bControl; x*BfRj  
  BOOL m_bAlt; 1K^/@^  
  BOOL m_bShift; u"pn'H  
  CString m_Path;  `9S<E  
  CString m_Number; vhWj_\m  
  //}}AFX_DATA f_D1zU^  
  // ClassWizard generated virtual function overrides /,E%)K;  
  //{{AFX_VIRTUAL(CCaptureDlg) 9J% dd0  
 public: 4"l(rg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bhe|q`1,E  
 protected: I \ vu?$w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6G@_!i*2F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ms^Y:,;Hi  
  //}}AFX_VIRTUAL lmr {Ib2a  
  // Implementation Y&'2/zI6~  
 protected: Q9%N>h9  
  HICON m_hIcon; VD36ce9  
  // Generated message map functions 2R2Z6}  
  //{{AFX_MSG(CCaptureDlg) /=m=i%& #  
  virtual BOOL OnInitDialog(); wAkoX  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TKRu^KH9  
  afx_msg void OnPaint(); w:M faN*  
  afx_msg HCURSOR OnQueryDragIcon(); <ezvz..g  
  virtual void OnCancel(); 2!]':(8mR  
  afx_msg void OnAbout(); !WVF{L,/I  
  afx_msg void OnBrowse(); ut-UTW  
  afx_msg void OnChange(); gyI5;il~  
 //}}AFX_MSG %@H;6   
 DECLARE_MESSAGE_MAP() 4^AE;= Q  
}; "=yaeEp  
#endif v,+2CVdW  
,p$1n;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file >K50 h  
#include "stdafx.h" !^l<jrM  
#include "Capture.h" g%4|vA8  
#include "CaptureDlg.h" z${B|  
#include <windowsx.h> |!57Z4X  
#pragma comment(lib,"hook.lib") lpSM p  
#ifdef _DEBUG oxcAKo  
#define new DEBUG_NEW J]N-^ld\\  
#undef THIS_FILE ^BNg^V.  
static char THIS_FILE[] = __FILE__; .f(x9|K^  
#endif @#8F5G#  
#define IDM_SHELL WM_USER+1 3b#KrN'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8uT@$ ./  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bE]2:~  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M5 Pvc  
class CAboutDlg : public CDialog uERc\TZ  
{ ]dk~C?H  
 public: lW^RwNcd  
  CAboutDlg(); S1&6P)X.Za  
  // Dialog Data 1S.nqOfx  
  //{{AFX_DATA(CAboutDlg) $stJ+uh  
  enum { IDD = IDD_ABOUTBOX }; J tYnBg?[E  
  //}}AFX_DATA mI"|^!L  
  // ClassWizard generated virtual function overrides 6"jq/Pu  
  //{{AFX_VIRTUAL(CAboutDlg) ~Qzm!Po,  
 protected: 'Ur$jW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5p=T*Y  
  //}}AFX_VIRTUAL z4{|?0=C  
  // Implementation Eer rIV  
 protected: v9M ;W+J  
  //{{AFX_MSG(CAboutDlg) 5 ^f>L2  
  //}}AFX_MSG #{ `(;83  
  DECLARE_MESSAGE_MAP() Nv #vfh9}P  
}; #G9S[J=xe  
Q3z-v&^E9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7z F29gC  
{ 1[X+6viE  
 //{{AFX_DATA_INIT(CAboutDlg) bS* "C,b~s  
 //}}AFX_DATA_INIT K[T? --H  
} 5;dnxhf  
l4r09"S|V  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) j>?c]h{-  
{ .D)'ZY  
 CDialog::DoDataExchange(pDX); X<Vko^vlj  
 //{{AFX_DATA_MAP(CAboutDlg) Qy@chN{eP  
 //}}AFX_DATA_MAP AX]lMe  
} wm8(Ju  
~p8-#A)X,)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L6 hTz'  
 //{{AFX_MSG_MAP(CAboutDlg) _E&*JX  
 // No message handlers a7OD%yQ  
 //}}AFX_MSG_MAP _?O'65  
END_MESSAGE_MAP() DFR.F:O%  
a{Tv#P*!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1_GUi  
: CDialog(CCaptureDlg::IDD, pParent) MlS<txFPS  
{ (y#8z6\dx  
 //{{AFX_DATA_INIT(CCaptureDlg) uF@Q8 7G  
  m_bControl = FALSE; f5d"H6%L  
  m_bAlt = FALSE; tR0o6s@v/<  
  m_bShift = FALSE; S G]e^%i  
  m_Path = _T("c:\\"); 0Ba-VY.H  
  m_Number = _T("0 picture captured."); `){*JPl  
  nCount=0; mv<z%y?Oj  
  bRegistered=FALSE; gt'0B-;W  
  bTray=FALSE; i (L;1 `  
 //}}AFX_DATA_INIT obaJT"1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ha3 Qx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); kF6X?mqgD  
} X`^9a5<"  
6^UeEmjc  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ).-B@&Eu%  
{ 1 ,[T;pdDd  
 CDialog::DoDataExchange(pDX); !*+~R2&b  
 //{{AFX_DATA_MAP(CCaptureDlg)  SvDVxK  
  DDX_Control(pDX, IDC_KEY, m_Key); GG%j+Ed  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >8>`-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >9Ub=tZm  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .T4"+FTzP  
  DDX_Text(pDX, IDC_PATH, m_Path); NaB8cLURp  
  DDX_Text(pDX, IDC_NUMBER, m_Number); n1.]5c3p  
 //}}AFX_DATA_MAP ;se-IDN  
} N7}.9%EV  
N<Ti]G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !t~S.`vF  
//{{AFX_MSG_MAP(CCaptureDlg) 3vNoD  
 ON_WM_SYSCOMMAND() l"b78n  
 ON_WM_PAINT() IqcPml{\  
 ON_WM_QUERYDRAGICON() CKNH/[ ZR,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) l)=Rj`M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jo{GPp}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) RK"dPr  
//}}AFX_MSG_MAP (#LV*&K%IC  
END_MESSAGE_MAP() 2$=?;~  
}T4"#'`  
BOOL CCaptureDlg::OnInitDialog() ##1[/D(  
{ MP;7 u%   
 CDialog::OnInitDialog(); Dr,{V6^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Fgt/A#`fz  
 ASSERT(IDM_ABOUTBOX < 0xF000); v[35C]gS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O2ety2}?f  
 if (pSysMenu != NULL) 4N*Fq!k~  
 { d!e$BiC  
  CString strAboutMenu; Gzc{2"p  
  strAboutMenu.LoadString(IDS_ABOUTBOX); osPX%k!yw  
  if (!strAboutMenu.IsEmpty()) )bw^!w)  
  { q ( H^H  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9'td}S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &hyr""NkAm  
  } 'zi5ihiT  
 } &tHT6,Xv(  
 SetIcon(m_hIcon, TRUE); // Set big icon "2N3L8?k  
 SetIcon(m_hIcon, FALSE); // Set small icon VO#]IXaP  
 m_Key.SetCurSel(0); H@,jNIh~h  
 RegisterHotkey(); Gvl-q1PVC  
 CMenu* pMenu=GetSystemMenu(FALSE); X2q$i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @M:j~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {$oZR" MP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (9fqUbG  
 return TRUE; // return TRUE unless you set the focus to a control u+z$+[lm!G  
} +%$!sp?  
m"X0Owx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :}o0Eb  
{ )?I1*(1{A  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a?M<r>  
 { o^d(mJZ.F~  
  CAboutDlg dlgAbout; }g5h"N\$o  
  dlgAbout.DoModal(); o24` 5Jdh  
 } Y-gjX$qGo  
 else y3c]zDjV  
 { .oN<c]iqE  
  CDialog::OnSysCommand(nID, lParam); .kBi" p&  
 } W446;)?5  
} @,pO%,E6  
l4|bpR Cp  
void CCaptureDlg::OnPaint() Uj1^?d+b  
{ _I3j 7f,V  
 if (IsIconic()) 9\R:J"X  
 { 2AzF@Pi^z  
  CPaintDC dc(this); // device context for painting O&E1(M|*>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FFK79e/5  
  // Center icon in client rectangle 9k&lq$  
  int cxIcon = GetSystemMetrics(SM_CXICON); #O\4XZ,Lv  
  int cyIcon = GetSystemMetrics(SM_CYICON); E6y/,s^~S_  
  CRect rect; gB71~A{J  
  GetClientRect(&rect); 8/ZJkI  
  int x = (rect.Width() - cxIcon + 1) / 2; 4US8B=jk  
  int y = (rect.Height() - cyIcon + 1) / 2; V0c*M>V  
  // Draw the icon Q?I)1][ !"  
  dc.DrawIcon(x, y, m_hIcon); B`iQN7fd  
 } AL&}WbUC  
 else r/Qq-1E  
 { \02j~r`o  
  CDialog::OnPaint(); s|"V$/X(W  
 } "|.>pD#0&  
} f|w+}z  
el;^cMY  
HCURSOR CCaptureDlg::OnQueryDragIcon() [ C] =p  
{ y%v<Cp@R  
 return (HCURSOR) m_hIcon; NnGQ=$e  
} yL_-w/a  
$6Nm`[V  
void CCaptureDlg::OnCancel() s7D_fv4e  
{ _+wv3? c"  
 if(bTray) !M)!  
  DeleteIcon(); iG6 ^s62z7  
  CDialog::OnCancel(); ^$`xUKp`pn  
} Rr|VGtg  
=LZj6'  
void CCaptureDlg::OnAbout() $_@~t$  
{ aVO5zR./)  
 CAboutDlg dlg; s~IOc%3  
 dlg.DoModal(); ` {k>I^Pg  
} G0^23j  
Y^2`)':  
void CCaptureDlg::OnBrowse() {!o-y=  
{ Qh? E* 9  
 CString str; p%]* I?  
 BROWSEINFO bi; de[c3!#1d  
 char name[MAX_PATH]; [qIi_(%o  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 42Tjbten_u  
 bi.hwndOwner=GetSafeHwnd(); zi:GvTG  
 bi.pszDisplayName=name; \G#Qe*"'K  
 bi.lpszTitle="Select folder"; #- z*c  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /Fk LZm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (|bMtT?"x  
 if(idl==NULL) }rn}r4_a  
  return; Kbg`ZO*  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y@nWa\i G  
 str.ReleaseBuffer(); |pqLwnOu  
 m_Path=str; VahR nD  
 if(str.GetAt(str.GetLength()-1)!='\\') .%U~ r2Y(  
  m_Path+="\\"; - EF(J  
 UpdateData(FALSE); $io-<Z#Q  
} TEh]-x`  
LCyci1\@  
void CCaptureDlg::SaveBmp() -l`@pklQ  
{ 6IctW5b  
 CDC dc; QKwWX_3%Z]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); J= ia  
 CBitmap bm; x +q"%9.c  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~V`D@-VND  
 int Height=GetSystemMetrics(SM_CYSCREEN); pyT+ba#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); HvKueTQ  
 CDC tdc; p27A#Uu2}  
 tdc.CreateCompatibleDC(&dc); i74^J+xk  
 CBitmap*pOld=tdc.SelectObject(&bm); wTf0O@``6H  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); UacN'Rat  
 tdc.SelectObject(pOld); E:D1ZV  
 BITMAP btm; SV<*qz  
 bm.GetBitmap(&btm); prlB9,3|C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >tr_Ypfv,c  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x/[i &Gkv  
 BITMAPINFOHEADER bih; J.$<Lnt>u  
 bih.biBitCount=btm.bmBitsPixel; 7. G   
 bih.biClrImportant=0; /JEH%)  
 bih.biClrUsed=0; e&OMW ,7  
 bih.biCompression=0; 8!VjXj"  
 bih.biHeight=btm.bmHeight; r[TS#hQ  
 bih.biPlanes=1; /I7sa* i  
 bih.biSize=sizeof(BITMAPINFOHEADER); "<v_fF<Y  
 bih.biSizeImage=size; $a15 8  
 bih.biWidth=btm.bmWidth; c~5#)AXMT  
 bih.biXPelsPerMeter=0; N5}vy$t_P  
 bih.biYPelsPerMeter=0; U"%k4]:A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); pvI(hjMYPk  
 static int filecount=0; Uf4QQ `c#  
 CString name; >u*woNw(XM  
 name.Format("pict%04d.bmp",filecount++); d=oOMXYa   
 name=m_Path+name; I%e7:cs>  
 BITMAPFILEHEADER bfh; JV36@DVQ  
 bfh.bfReserved1=bfh.bfReserved2=0; c5;YKON  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B 0 K2Uw  
 bfh.bfSize=54+size; at,Xad\j  
 bfh.bfOffBits=54; tPO.^  
 CFile bf; vEtogkFA"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ qt^%jIv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $C9<{zX   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6ynQCD  
  bf.WriteHuge(lpData,size); xXA$16kd  
  bf.Close(); g~FB&U4c  
  nCount++; reu[}k~  
 } IH\k_Yf#u  
 GlobalFreePtr(lpData); iBp 71x65  
 if(nCount==1) iUS379wM}  
  m_Number.Format("%d picture captured.",nCount); v 0rX/ mj  
 else k{c~  
  m_Number.Format("%d pictures captured.",nCount); Ef%8+_  
  UpdateData(FALSE); e&; c^Z  
} +FY-r[_~  
&0(2Z^Z>fw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 7 aDI6G  
{ S~(4q#Dt-  
 if(pMsg -> message == WM_KEYDOWN) d2.n^Q"?3  
 { "{z9 L+  
  if(pMsg -> wParam == VK_ESCAPE) `3pe\s  
   return TRUE; B|:{.U@ne  
  if(pMsg -> wParam == VK_RETURN) i$"FUC~'  
   return TRUE; & \<RVE  
 } T2Y`q'  
 return CDialog::PreTranslateMessage(pMsg); R&ou4Y:DG  
} lmH!I )5  
)@R:$l86  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }^`{YD  
{ Gk[P-%%b /  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .8b 4  
  SaveBmp(); P2`ks[u+i  
  return FALSE;  %ef+Z  
} }s}9@kl;&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &CUkR6  
 CMenu pop; >x2T '  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B{)Du :)  
 CMenu*pMenu=pop.GetSubMenu(0); ,Yi =s;E  
 pMenu->SetDefaultItem(ID_EXITICON); I=(O,*+PQ  
 CPoint pt; wTIf#y1=9  
 GetCursorPos(&pt); -)y"EJ(N  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;Jx ^  
 if(id==ID_EXITICON) nJ*NI)  
  DeleteIcon(); /jj!DO#  
 else if(id==ID_EXIT) _x UhDu%  
  OnCancel(); ]"/ *7NM  
 return FALSE; ZN1QTb  
} {GHGFi`Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yt!K|g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xo%Anqk  
 AddIcon(); `&pb`P<`  
 return res; _F@FcFG1Z*  
} ,x{5,K.yWq  
D"^ogY#LK  
void CCaptureDlg::AddIcon() @C z1rKU^l  
{ k;LENB2iv  
 NOTIFYICONDATA data; + s[(CI.b  
 data.cbSize=sizeof(NOTIFYICONDATA); l_,8_u7G  
 CString tip; P92:}" )*>  
 tip.LoadString(IDS_ICONTIP); g^0  
 data.hIcon=GetIcon(0); Z :Kob b  
 data.hWnd=GetSafeHwnd(); cst=ms  
 strcpy(data.szTip,tip); "K\Rq+si  
 data.uCallbackMessage=IDM_SHELL; nF=Ig-NX^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \s~ W;m  
 data.uID=98; 3J(STIxg  
 Shell_NotifyIcon(NIM_ADD,&data); kY_UY~E  
 ShowWindow(SW_HIDE); E"L'm0i[[  
 bTray=TRUE; :-6_X<  
} @F3d9t-  
.S?,%4v%%  
void CCaptureDlg::DeleteIcon() >`oO(d}n[0  
{ w~Y#[GW  
 NOTIFYICONDATA data; ^' [|  
 data.cbSize=sizeof(NOTIFYICONDATA); 8uI^ B  
 data.hWnd=GetSafeHwnd(); !. 0W?6yo  
 data.uID=98; X(WG:FP27  
 Shell_NotifyIcon(NIM_DELETE,&data); %H}+'.8  
 ShowWindow(SW_SHOW); !0fK*qIL  
 SetForegroundWindow(); \[D"W{9l  
 ShowWindow(SW_SHOWNORMAL); Q45rP4mQ  
 bTray=FALSE; NEGpf[$  
} 4tu2%Og)?  
>Zr/U!W*?  
void CCaptureDlg::OnChange() Pc4sReo'  
{ _')KDy7  
 RegisterHotkey(); [fW:%!Y'  
} pbgCcO~xm  
HuK'tU#  
BOOL CCaptureDlg::RegisterHotkey() wkIH<w|jb  
{ P}VD}lEyO  
 UpdateData(); ^ )+tn  
 UCHAR mask=0; el[6E0!@  
 UCHAR key=0; w\@Anwj#L  
 if(m_bControl) ^3r2Q?d\  
  mask|=4; ]]7s9PCN  
 if(m_bAlt) CX1'B0=\r  
  mask|=2; Y: byb68  
 if(m_bShift) eA+6-'qN  
  mask|=1; 0&mz'xra  
  key=Key_Table[m_Key.GetCurSel()]; :^ cA\2=  
 if(bRegistered){ %*s[s0$c  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); sF<4uy  
  bRegistered=FALSE; 3b[_0  
 } (JF\%Yj/  
 cMask=mask; #K4wO!d  
 cKey=key; 6'Lij&,f?{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7M$>'PfO  
 return bRegistered; }2h~o~  
} YE^|G,]  
Ybok[5  
  四、小结 6~2!ZU  
\,_%e[g49  
  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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