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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: wgZ6|)!0  
  gE6{R+sp  
  一、实现方法 S2$r 6T  
(KT+7j0^  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: =5g|7grQ:`  
tU>4?`)E  
#pragma data_seg("shareddata") =#vU$~a  
HHOOK hHook =NULL; //钩子句柄 ]?hlpL  
UINT nHookCount =0; //挂接的程序数目 !]P=v`B.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Kj|\ALI':  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *YTv"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Qy) -gax:,  
static int KeyCount =0; ~gOdK-SV*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7:OF>**  
#pragma data_seg() QQUZneIDp  
2%j"E{J&  
  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。 h ?+vH{}j  
,uS}wJAX  
  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: !]#;'  
E1|:t$>Ld  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .c_qMTm"  
cKey,UCHAR cMask) Q_|Lv&  
{ |TuFx=~5v  
 BOOL bAdded=FALSE; .WW|v  
 for(int index=0;index<MAX_KEY;index++){ \0^Je>-:U  
  if(hCallWnd[index]==0){ !A"-9OS2  
   hCallWnd[index]=hWnd; ^L's45&_  
   HotKey[index]=cKey; !GZ{UmwA  
   HotKeyMask[index]=cMask; 'zYx4&s  
   bAdded=TRUE; YHo*IX')C?  
   KeyCount++; =|q@ Q`DB  
   break; P".rm0@R  
  } IPlkv{^  
 } aX35^K /  
 return bAdded; Mog!pmc{  
} Y!_e ,]GW  
//删除热键 i7xBi:Si  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bet?]4\_  
{ /U"3LX  
 BOOL bRemoved=FALSE; 5f#]dgBe  
 for(int index=0;index<MAX_KEY;index++){ ngH_p>  
  if(hCallWnd[index]==hWnd){ S{qsq\X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^1[u'DW4  
    hCallWnd[index]=NULL; 6 kAXE\T  
    HotKey[index]=0; [u/Wh+  
    HotKeyMask[index]=0; fMRMQR=6B  
    bRemoved=TRUE; UjS,<>fm  
    KeyCount--; /@K1"/fqH  
    break; lhJZPnx~  
   } &y:SK)  
  } 6>/g`%`N  
 } +rOd0?  
 return bRemoved; 6ieP` bct  
} b'G!)n  
=' #yG(h  
etH]-S  
  DLL中的钩子函数如下: |&rxDf}W  
(/Dr=D{ `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) KoTQc0b!  
{ Bl v @u?  
 BOOL bProcessed=FALSE; -<aN$O  
 if(HC_ACTION==nCode) hN.{H:skL)  
 { hx sW9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <qCfw>%2F  
   switch(wParam) 3[iHe+U(  
   {  %x|0<@b7-  
    case VK_MENU: UoKXo*W2  
     MaskBits&=~ALTBIT; xtRHb''FX  
     break; Z66q0wR7  
    case VK_CONTROL: P}mn2Hs  
     MaskBits&=~CTRLBIT; N(L?F):fT  
     break; c=~FXV!  
    case VK_SHIFT: Vw b6QIs  
     MaskBits&=~SHIFTBIT; # ,27,#  
     break; ( T2 \   
    default: //judge the key and send message @# &y  
     break; C(5B/W6  
   } 4$jb-Aw  
   for(int index=0;index<MAX_KEY;index++){ "9yQDS:  
    if(hCallWnd[index]==NULL) L2^M#G@t  
     continue; [V.#w|n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )nA fT0()0  
    { +`Ypc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G,h=5y9_J  
     bProcessed=TRUE; }`$Sr&n 1  
    } .wz.Jr`{  
   } S(h+,+289  
  } \>r<z46x  
  else if((lParam&0xc000ffff)==1){ //有键按下 Tjza3M  
   switch(wParam) 8yn}|Y9Fu  
   { ^jZ4tH3K  
    case VK_MENU: g:CMIe4  
     MaskBits|=ALTBIT; RS[>7-9  
     break; m8<l2O=m  
    case VK_CONTROL: Kq2,J&Ca3  
     MaskBits|=CTRLBIT; ^%k[YJtB=i  
     break; KcNh3CR  
    case VK_SHIFT: V<G=pPC'H  
     MaskBits|=SHIFTBIT; $&[}+??  
     break; x6B_5eF  
    default: //judge the key and send message h[I~D`q)v  
     break; 6$*ZH *  
   } v6`TbIq%  
   for(int index=0;index<MAX_KEY;index++){ w-9fskd6e  
    if(hCallWnd[index]==NULL) ([L5i&DT  
     continue; $oU40HA)W]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {9*k \d/;  
    { @`Foy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7Q3a0`Iq  
     bProcessed=TRUE; Fb9!x/$tGV  
    } x6={)tj  
   } !`?*zf  
  } [agp06 $D?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q7@.WG5  
   for(int index=0;index<MAX_KEY;index++){ o$+"{3svw?  
    if(hCallWnd[index]==NULL) $M 1/74  
     continue; T`.RP&2/d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) or{X{_X7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @ 80Z@Pj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P n|*(sTl  
   } beCTOmC  
  } }qOj^pkJ  
 } rkz_h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V[T`I a\  
} Auz.wes  
]Uee!-dZ  
  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: r^|AiYI)  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }tRY,f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S.X*)CBB  
{(MC]]'?  
  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: _.y0 QkwV  
4tv}V:EO  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vPA {)l\K  
{ llP 5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =UW! 7OzC  
 { t^zmv PDK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ">^O{X\  
  SaveBmp(); $Q cr  
  return FALSE;  B1!b@0^  
 } 0kdPr:B Q0  
 …… //其它处理及默认处理 N ?mTAF'M  
} KixS)sG  
r|>a;n Y  
2po>%Cp  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 1^4z/<ZWm  
nR1QS_@{L  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Dtw1q-  
-$js5 Gx1  
  二、编程步骤 0+P<1ui  
9OnH3  
  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"; %8a886;2  
~@wM[}ThP$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g:sn/Zug]  
O8drR4 Pt  
  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; SuU_psF  
z rg#BXj7  
  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; rL /e  
8I`t`C/4  
  5、 添加代码,编译运行程序。 |3A/Og  
a*Oc:$  
三、程序代码 r)G^V&96  
tgPx!5U  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Y]SX2kk(2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {:;599l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *$I5_A8,.  
#if _MSC_VER > 1000 D+ )R_  
#pragma once =E?!!EIq.  
#endif // _MSC_VER > 1000 (ugB3o  
#ifndef __AFXWIN_H__ C \B&'+uR  
#error include 'stdafx.h' before including this file for PCH :7w^2/ZGo  
#endif 3 0fsVwE2  
#include "resource.h" // main symbols Uz`K#Bz   
class CHookApp : public CWinApp y(!Y N7_A  
{ Gw5j6  
 public: _*SA_.0  
  CHookApp(); Gw/imXL  
  // Overrides m.}Yn,  
  // ClassWizard generated virtual function overrides 5g{F-  
  //{{AFX_VIRTUAL(CHookApp) :bhpYEUMx  
 public: Rt[zZv  
  virtual BOOL InitInstance(); t'@qb~sf  
  virtual int ExitInstance(); !u0qF!/W  
  //}}AFX_VIRTUAL lo%:$2*'p  
  //{{AFX_MSG(CHookApp) $]Vvu{  
  // NOTE - the ClassWizard will add and remove member functions here. 5zqlK-$  
  // DO NOT EDIT what you see in these blocks of generated code ! X(Wd  
  //}}AFX_MSG _rz*7-ks=  
  DECLARE_MESSAGE_MAP() ]}~[2k.  
}; El}."}l&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =D2jJk?AX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l<]@5"wN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9,4Lb]  
BOOL InitHotkey(); LXIQpD,M  
BOOL UnInit(); *hP9d;-Ar  
#endif %$)[qa3  
c<`Z[EY(t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -Tw96 dv  
#include "stdafx.h" #Tjv(O[&  
#include "hook.h" -xc*R%k  
#include <windowsx.h> B|~tW21  
#ifdef _DEBUG {q[l4_  
#define new DEBUG_NEW S-^RZ"  
#undef THIS_FILE Ez*9*]O*+  
static char THIS_FILE[] = __FILE__; =-r[ s%t &  
#endif yH'vhtop  
#define MAX_KEY 100 8e`'Ox_5a  
#define CTRLBIT 0x04 2&f] v`|M|  
#define ALTBIT 0x02 GtCbzNY  
#define SHIFTBIT 0x01 ]5+db0  
#pragma data_seg("shareddata") c3X'Sv  
HHOOK hHook =NULL; yj6o533o  
UINT nHookCount =0; 4+Sq[Rv0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +$hqwNh@Z@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y7;i4::A\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;<JyA3i^V,  
static int KeyCount =0; nty^De%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift meHnT9a^  
#pragma data_seg() XF`,mV4  
HINSTANCE hins; o Q!56\R  
void VerifyWindow(); *vL2n>HH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &vf%E@<  
//{{AFX_MSG_MAP(CHookApp) +wAH?q8f  
// NOTE - the ClassWizard will add and remove mapping macros here. v[r5!,F  
// DO NOT EDIT what you see in these blocks of generated code! 1 h.=c  
//}}AFX_MSG_MAP )}-,4Iu%  
END_MESSAGE_MAP() &B</^:  
Hqel1J  
CHookApp::CHookApp() ;^q@w  
{ j{i3lGaN  
 // TODO: add construction code here, 7gLN7_2  
 // Place all significant initialization in InitInstance : "|M  
} 1e 8J-Nkj  
_Ra$"j  
CHookApp theApp; Vt {uG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H8V${&!ho  
{ _%M5 T  
 BOOL bProcessed=FALSE; 9!u=q5+E  
 if(HC_ACTION==nCode) |a(%a43fC  
 { wF +9Iu  
  if((lParam&0xc0000000)==0xc0000000){// Key up tFY;q##z  
   switch(wParam) Ag3[Nu1  
   { ,X[l C\1a  
    case VK_MENU: U4J9b p|  
     MaskBits&=~ALTBIT; |mSFa8G@  
     break; /kl41gx  
    case VK_CONTROL: q K sI}X~  
     MaskBits&=~CTRLBIT; \GL!x 7s1A  
     break; y#4f^J!V  
    case VK_SHIFT: 'l%b5:  
     MaskBits&=~SHIFTBIT; vo9DmW  
     break; 1}moT#  
    default: //judge the key and send message 3fS+,>s\O  
     break; xQ[~ c1  
   } ZfPWH'P  
   for(int index=0;index<MAX_KEY;index++){ ionFPc].  
    if(hCallWnd[index]==NULL) Sn I-dXNF  
     continue; i@=0fHiZQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i`]-rM%J#  
    { 8X6F6RK6,1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); CCCd=s.  
     bProcessed=TRUE; uQwKnD?F+e  
    } Xknp*(9  
   } ,t`u3ykh  
  } 7oj ^(R,  
  else if((lParam&0xc000ffff)==1){ //Key down Z /#&c  
   switch(wParam) %h)6o99{wF  
   { <oweLRt  
    case VK_MENU: C #A sA  
     MaskBits|=ALTBIT; $\S;f"IM.  
     break; ~uF%*  
    case VK_CONTROL: Htg,^d 5  
     MaskBits|=CTRLBIT; C+, JLK  
     break; =J2\"6BnzA  
    case VK_SHIFT: :ET05MFs\#  
     MaskBits|=SHIFTBIT; }:5_vH0  
     break; Pc+8CuN?  
    default: //judge the key and send message :[;]6;  
     break; 1o&] =(  
   } %\5 wHT+)  
   for(int index=0;index<MAX_KEY;index++) 334UMH__  
   { y\=(;]S'  
    if(hCallWnd[index]==NULL) V'kCd4  
     continue; ^hG Y,\K9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _0~WT  
    { [(Z sQK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T=/GFg'  
     bProcessed=TRUE; qb^jcy  
    } ]g#ur@Y%  
   } 6`/nA4S4.  
  } n|t?MoUP  
  if(!bProcessed){ 4NY00d/R  
   for(int index=0;index<MAX_KEY;index++){ vx:MLmZ.  
    if(hCallWnd[index]==NULL) 'z'q)vcr  
     continue; $$U Mc-Pq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q|*}>=NX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jwm2ZJW  
   } 28 h3Ayw4  
  } I! s&m%s  
 } .~ )[>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x$Gu)S  
} K+3dwQo  
>C6wm^bl  
BOOL InitHotkey() 0FA N9u2  
{ `t0?PpUo  
 if(hHook!=NULL){ !$ $|zB%  
  nHookCount++; H+^93  
  return TRUE; 4'&j<Ah[#  
 } ]zGgx07d  
 else *?;<buJb?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OYcf+p"<\  
  if(hHook!=NULL) JfJUOaL  
   nHookCount++; +-b:XeHSZ  
  return (hHook!=NULL); ?y.q<F)  
} qo1eHn4  
BOOL UnInit() HPc7Vo(  
{ 4nC`DJ;V  
 if(nHookCount>1){ KfC8~{O-  
  nHookCount--; xM ]IU <  
  return TRUE; a&>Tk%  
 } q3+G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2k\i/i/Y  
 if(unhooked==TRUE){ : K%{?y  
  nHookCount=0; 9fk@C/$  
  hHook=NULL;  2C9wOO  
 } tBDaFB  
 return unhooked; w]Q0}Z  
} ]dZ8]I<$C  
$"P9I-\m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x/nlIoT  
{ E0K'|*  
 BOOL bAdded=FALSE; <E2+P,Lgw  
 for(int index=0;index<MAX_KEY;index++){ zzf;3S?  
  if(hCallWnd[index]==0){ *gu4%  
   hCallWnd[index]=hWnd; yY,O=yOjq  
   HotKey[index]=cKey; ("2ukHc  
   HotKeyMask[index]=cMask; H*#L~!]  
   bAdded=TRUE; @"M%ZnFu  
   KeyCount++; :HSqa9>wa  
   break; ~vD7BO`  
  } //c<p  
 } :D-xa!7  
 return bAdded; T*,kBJ  
} */=5m]  
a );>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?klV;+  
{ .C avb  
 BOOL bRemoved=FALSE; n^8LF9r  
 for(int index=0;index<MAX_KEY;index++){ t;P%&:"@M  
  if(hCallWnd[index]==hWnd){ ]~my<3j}or  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %9z N U  
    hCallWnd[index]=NULL; t`b>iX%(1t  
    HotKey[index]=0; ->DfT*)  
    HotKeyMask[index]=0; IUX~dO  
    bRemoved=TRUE; Vp =  
    KeyCount--; 1}#(4tw)  
    break; >>lT-w  
   } hg}Rh  
  } :e-&,K  
 } l26DPtWi  
 return bRemoved; j M%qv  
} "j+zd&*={  
K`!q1 g`  
void VerifyWindow() !^Mk5E(  
{ I!(.tu6u6c  
 for(int i=0;i<MAX_KEY;i++){ #q{i<E 07  
  if(hCallWnd!=NULL){ Dp:u!tdbeg  
   if(!IsWindow(hCallWnd)){ =}S*]Me5  
    hCallWnd=NULL; O.7Q* ^_  
    HotKey=0; neQ2k=ao  
    HotKeyMask=0; rbP" n)0=  
    KeyCount--; IY@)  
   } j%%l$i~  
  } =Qt08,.bW  
 } b .9]b  
} JTcK\t8  
yVe<[!hJ  
BOOL CHookApp::InitInstance() ebk{p <  
{ ny:c&XS  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Lp\89tB>  
 hins=AfxGetInstanceHandle(); &]VCZQL  
 InitHotkey(); fM jn8.  
 return CWinApp::InitInstance(); 3zJbb3e  
} ZN)a}\]  
%G9: M;|'  
int CHookApp::ExitInstance() =>ooB/  
{ F(E3U'G  
 VerifyWindow(); r!eCfV7  
 UnInit(); 9moenkL  
 return CWinApp::ExitInstance(); }8E//$J  
} ?}*A/-Hx0U  
'T54k  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |]7z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sY?pp '}a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ owA3>E5t&  
#if _MSC_VER > 1000 ZoJ:4uo N`  
#pragma once f o])=KM  
#endif // _MSC_VER > 1000 g`KVF"8  
Lu&2^USTO  
class CCaptureDlg : public CDialog &wj;:f  
{ ]JQk,<l5E  
 // Construction lhm=(7Y  
 public: wAE ,mw  
  BOOL bTray; m ys5B}  
  BOOL bRegistered; =re1xR!E5  
  BOOL RegisterHotkey(); YH`/;H=$G/  
  UCHAR cKey; Gy36{*  
  UCHAR cMask; CFJ F}aW  
  void DeleteIcon(); zn5  
  void AddIcon(); x1)G!i  
  UINT nCount; O`e0r%SJ  
  void SaveBmp(); oD,f5Ci-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A3%s5`vNvH  
  // Dialog Data >'#G$f  
  //{{AFX_DATA(CCaptureDlg) $rf4h]&<  
  enum { IDD = IDD_CAPTURE_DIALOG }; dbGW`_zQ4  
  CComboBox m_Key; }?B=R#5  
  BOOL m_bControl; 84[T!cDk  
  BOOL m_bAlt; T2# W=P  
  BOOL m_bShift; %-@`|  
  CString m_Path; Wt+aW  
  CString m_Number; PezUG{q(  
  //}}AFX_DATA ^.Y"<oZSS  
  // ClassWizard generated virtual function overrides >LxYP7M  
  //{{AFX_VIRTUAL(CCaptureDlg) jqHg'Fq  
 public: X#mm Z;P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); hvu>P {  
 protected: .?b2Bd!MC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .fxI)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CQfrAk4mu  
  //}}AFX_VIRTUAL ?4=8z8((!  
  // Implementation D%cWw0Oq  
 protected: v%3mhk#  
  HICON m_hIcon; 89KX.d  
  // Generated message map functions P[PBoRd2  
  //{{AFX_MSG(CCaptureDlg) >`DbT:/<  
  virtual BOOL OnInitDialog(); ]X +3"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5J1A|qII  
  afx_msg void OnPaint(); tx;DMxN!W  
  afx_msg HCURSOR OnQueryDragIcon(); ;J pdnV  
  virtual void OnCancel(); UD [S>{  
  afx_msg void OnAbout(); mg)lr&-b  
  afx_msg void OnBrowse(); 1E!0N`E  
  afx_msg void OnChange(); ~uRG~,{rH  
 //}}AFX_MSG Ee>P*7*jB  
 DECLARE_MESSAGE_MAP() h+|3\>/@9{  
}; DsY-JBDvoz  
#endif MGIpo[  
TEOV>Tt  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~*D)L'`2M  
#include "stdafx.h" e!yUA!x`u  
#include "Capture.h" v=?U{{xQ  
#include "CaptureDlg.h" MjC;)z  
#include <windowsx.h> #5O'XH5_  
#pragma comment(lib,"hook.lib") V%&t'H{  
#ifdef _DEBUG -CW&!oW  
#define new DEBUG_NEW ^z3-$98=A  
#undef THIS_FILE Ltpd:c  
static char THIS_FILE[] = __FILE__; C,C%1  
#endif qOz,iR?}  
#define IDM_SHELL WM_USER+1 $DC*&hqpt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BM{GSX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ")7,ZN;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L f[>U  
class CAboutDlg : public CDialog sChMIbq!Av  
{ 94r8DkI  
 public: .EVy?-   
  CAboutDlg(); 7\ d{F)7E  
  // Dialog Data 6\4n y0  
  //{{AFX_DATA(CAboutDlg) 9}kN9u  
  enum { IDD = IDD_ABOUTBOX }; BR\% aU$u  
  //}}AFX_DATA +NPk9jn  
  // ClassWizard generated virtual function overrides dC@aQi6{6  
  //{{AFX_VIRTUAL(CAboutDlg) (+>~6SE  
 protected: OxX{[|!`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +4ax~fuU  
  //}}AFX_VIRTUAL UiS9uGj  
  // Implementation 8WV1OIL  
 protected: qVC_K/w 7  
  //{{AFX_MSG(CAboutDlg) boo,KhW'Y  
  //}}AFX_MSG eA&hiAP/  
  DECLARE_MESSAGE_MAP() a&)0_i:r  
}; Pgg6(O9}B^  
c"t1E-Nsk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4vTO  #F  
{ k|-`d  
 //{{AFX_DATA_INIT(CAboutDlg) c\UVMyE  
 //}}AFX_DATA_INIT &oiX/UaY  
} @Fqh]1t  
(6z^m?t?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?GU/Rf!H#  
{ wXDF7tJh  
 CDialog::DoDataExchange(pDX); t$r^'ZN  
 //{{AFX_DATA_MAP(CAboutDlg) XETY)<g  
 //}}AFX_DATA_MAP )H$Ik)/N  
} sj2v*tFb  
l.1)%q&@^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) B?-RzWB\3  
 //{{AFX_MSG_MAP(CAboutDlg) dv-yZRU:  
 // No message handlers g~.,-V}  
 //}}AFX_MSG_MAP Y5=~>*e  
END_MESSAGE_MAP() !U}A1)  
@B ~! [l  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +GI[ Kq  
: CDialog(CCaptureDlg::IDD, pParent) pOD|  
{ nWN~G  
 //{{AFX_DATA_INIT(CCaptureDlg) V4qHaG  
  m_bControl = FALSE; b$[_(QUw  
  m_bAlt = FALSE; !`\W8JT+  
  m_bShift = FALSE; Dqe)8 r  
  m_Path = _T("c:\\"); ?LgR8/Io@5  
  m_Number = _T("0 picture captured."); l9 )iLOj  
  nCount=0; j>eL&.d  
  bRegistered=FALSE; ~j 3B'  
  bTray=FALSE; Yqmx]7Y4  
 //}}AFX_DATA_INIT #NNj#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >joGG T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O;f^' N  
} 4 C[,S|J  
fOJk+? c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Rp A76ug  
{ Nv*x^y]  
 CDialog::DoDataExchange(pDX); [{N i94:d  
 //{{AFX_DATA_MAP(CCaptureDlg) qLKyr@\'  
  DDX_Control(pDX, IDC_KEY, m_Key);  wxsJB2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); F^_d8=67h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |`s}PcV  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); H#k"[eZ  
  DDX_Text(pDX, IDC_PATH, m_Path); 9 f-T>}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); swG^L$r`  
 //}}AFX_DATA_MAP xj{X#[q):  
} "Na9Xea  
v6oPAqj,r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) riZFcVsB  
//{{AFX_MSG_MAP(CCaptureDlg) G6JyAC9j  
 ON_WM_SYSCOMMAND() Q'JEDH\  
 ON_WM_PAINT() Q6,rY(b6  
 ON_WM_QUERYDRAGICON() ]?-56c,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )]J I Q"rR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5h1!E  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C-qsyJgZy  
//}}AFX_MSG_MAP >tr?5iKxc  
END_MESSAGE_MAP() "+_]N9%)  
vKAHf;1  
BOOL CCaptureDlg::OnInitDialog() _|DP  
{ % %c0UaV  
 CDialog::OnInitDialog(); kBIF[.v(\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0o At=S  
 ASSERT(IDM_ABOUTBOX < 0xF000); fj0+a0h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i0-!!  
 if (pSysMenu != NULL) j6Jz  
 { Z/q%%(fh 0  
  CString strAboutMenu; D\(,:_ge  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 78+H|bH8  
  if (!strAboutMenu.IsEmpty()) *IGxa  
  { =d~]*[8  
   pSysMenu->AppendMenu(MF_SEPARATOR); ifTVTd7O  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); sl6p/\_w  
  } M=yZ5~3  
 } ?MKf=! w  
 SetIcon(m_hIcon, TRUE); // Set big icon P)1@HDN==  
 SetIcon(m_hIcon, FALSE); // Set small icon 2@08 V|  
 m_Key.SetCurSel(0); `"AjbCL  
 RegisterHotkey(); }S*6+4  
 CMenu* pMenu=GetSystemMenu(FALSE); F Paj p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -J[zJ4z #  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P(X#w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); PC\Xm,,  
 return TRUE; // return TRUE unless you set the focus to a control IS&`O= 7  
} 0#K@^a  
r{\cm Ds  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [.6>%G1C  
{ mI9h| n  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Zt lS*id_  
 { ] |u}P2  
  CAboutDlg dlgAbout; "oz @w'rG  
  dlgAbout.DoModal(); 7;CeQx/W)W  
 } [2i+f <  
 else `Z|s p  
 { U%oI*  
  CDialog::OnSysCommand(nID, lParam); N#7] xL  
 } 3 %DA{  
} $k'f)E  
3Xd+>'H  
void CCaptureDlg::OnPaint() NnHwk)'  
{ V]q{N-Iq  
 if (IsIconic()) u:HKmP;  
 { r0\bi6;s/  
  CPaintDC dc(this); // device context for painting DIk$9$"<x  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X'k w5P!sq  
  // Center icon in client rectangle ]2h[.qa  
  int cxIcon = GetSystemMetrics(SM_CXICON); ~;+i[Z&e  
  int cyIcon = GetSystemMetrics(SM_CYICON); .Z_U]_(  
  CRect rect; GbP!l;a  
  GetClientRect(&rect); /2FX"I[0V%  
  int x = (rect.Width() - cxIcon + 1) / 2; am%qlN<  
  int y = (rect.Height() - cyIcon + 1) / 2; 44%H? ,d  
  // Draw the icon '/sc `(`:0  
  dc.DrawIcon(x, y, m_hIcon); m9L+|r  
 } cYbO)?mC_  
 else l$zNsf.  
 { FblGFm"P  
  CDialog::OnPaint(); T{)!>)  
 } "*7I~.7U(*  
} e\yj>tQJg  
UD9h5PgT  
HCURSOR CCaptureDlg::OnQueryDragIcon() AP@xZ%;K  
{ N.64aL|1  
 return (HCURSOR) m_hIcon; 'h81\SKFK9  
} c'G\AbUVjE  
]6:5<NW  
void CCaptureDlg::OnCancel() SN]/~>/  
{ _I8-0DnOM  
 if(bTray) *kKGsy  
  DeleteIcon(); 9txZ6/  
  CDialog::OnCancel(); Ys<wWfW  
} `Mjm/9+18  
SQ.4IWT(hR  
void CCaptureDlg::OnAbout() 0I#<-9&d-  
{ yBl<E$=  
 CAboutDlg dlg; 8vT:icl  
 dlg.DoModal(); }s)Z:6;(,q  
} EXBfzK)a  
ze 4/XR  
void CCaptureDlg::OnBrowse() >^Y 9p~  
{ ;zCHEz  
 CString str; Y4{`?UM&h  
 BROWSEINFO bi; iF%q 6R  
 char name[MAX_PATH]; t&&OhHK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ':>B %k  
 bi.hwndOwner=GetSafeHwnd(); /C(L(X  
 bi.pszDisplayName=name; H!Od.$ZIX  
 bi.lpszTitle="Select folder"; w(G(Q>GI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ALw uw^+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9 V"j=1B}  
 if(idl==NULL) ~'U;).C  
  return; uZYeru"w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;T_9;RU<'b  
 str.ReleaseBuffer(); c3}}cFe  
 m_Path=str; w1}[lq@  
 if(str.GetAt(str.GetLength()-1)!='\\') .U1dcL6  
  m_Path+="\\"; -0]aOT--  
 UpdateData(FALSE); V\G>e{  
} }Sh-4:-D  
T2->  
void CCaptureDlg::SaveBmp() uVk8KMYU  
{ $` oA$E3  
 CDC dc; e7qT;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); t/$xzsoJZr  
 CBitmap bm; 3Yf$WE8#l  
 int Width=GetSystemMetrics(SM_CXSCREEN); oby*.61?5l  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;CvGIp&y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5{5ABV  
 CDC tdc; ]S:@=9JB'  
 tdc.CreateCompatibleDC(&dc); D!P?sq_5r  
 CBitmap*pOld=tdc.SelectObject(&bm); SH(kUL5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |u+&xX7  
 tdc.SelectObject(pOld); D# $gdjZ  
 BITMAP btm; 4w?7AI]Ej  
 bm.GetBitmap(&btm); MCCZh{uo  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ku{aOV%  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <-?B#  
 BITMAPINFOHEADER bih; esHiWHAC  
 bih.biBitCount=btm.bmBitsPixel; xL BG}C  
 bih.biClrImportant=0; q)~qd$yMS  
 bih.biClrUsed=0; M'HOw)U  
 bih.biCompression=0; j"V$J8)[  
 bih.biHeight=btm.bmHeight; 35>}$1?-6  
 bih.biPlanes=1; |. 6@-h~8  
 bih.biSize=sizeof(BITMAPINFOHEADER); f@{C3E dd  
 bih.biSizeImage=size; IF:M_   
 bih.biWidth=btm.bmWidth; 6Te}"t>  
 bih.biXPelsPerMeter=0; m7"f6zSo(  
 bih.biYPelsPerMeter=0; d"78:+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 47RYpd  
 static int filecount=0; q>[% C5  
 CString name; :9#`| #uh  
 name.Format("pict%04d.bmp",filecount++); Zb 2  
 name=m_Path+name; wI4;/w>  
 BITMAPFILEHEADER bfh; aYgJTep>r  
 bfh.bfReserved1=bfh.bfReserved2=0; 8F * WT|]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ypd?mw&1}  
 bfh.bfSize=54+size; 4yA`);r62  
 bfh.bfOffBits=54; 6+5Catsn  
 CFile bf; V!P3CNK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V9 VP"kD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); </X"*G't  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $imx-H`|  
  bf.WriteHuge(lpData,size); m\f_u*  
  bf.Close(); (*ng$z Z$  
  nCount++; V\"5<>+O  
 } {X$Mwqhpp;  
 GlobalFreePtr(lpData);  SoX V  
 if(nCount==1) mig3.is  
  m_Number.Format("%d picture captured.",nCount); X W)A~wPBs  
 else =5`@:!t7  
  m_Number.Format("%d pictures captured.",nCount); /)1-^ju  
  UpdateData(FALSE); TJpv"V  
} K5>:Wi Y  
@QG1\W'  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `k&K"jA7$  
{ X2[cR;;'  
 if(pMsg -> message == WM_KEYDOWN) KV_Ga8hs  
 { @"8QG^q8de  
  if(pMsg -> wParam == VK_ESCAPE) DKl7|zG4  
   return TRUE; }/spo3,6  
  if(pMsg -> wParam == VK_RETURN) e{;e   
   return TRUE; b0X[x{k"  
 } ^0Q*o1W  
 return CDialog::PreTranslateMessage(pMsg); yxN!*~BvL  
} \zU5G#LQ  
?U08A{ c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1VFqT'  
{ .@Uz/j?>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [MS.5+1Y  
  SaveBmp(); !j9i=YDb  
  return FALSE; mPin\-I  
} W~3tQ!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7Ca\ (82  
 CMenu pop; ^kvH/Y&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Mj B[5:s  
 CMenu*pMenu=pop.GetSubMenu(0); YSo7~^1W"  
 pMenu->SetDefaultItem(ID_EXITICON); ap^=CEf   
 CPoint pt; Q ~JKKq  
 GetCursorPos(&pt); 6# ";W2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h&bV!M  
 if(id==ID_EXITICON) ]Rh( =bg  
  DeleteIcon(); 1fv~r@6s  
 else if(id==ID_EXIT) i[{] LiP  
  OnCancel(); J~3T8e#  
 return FALSE; (Fzh1#  
} lzG;F]  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `HG19_Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4QAIQQS  
 AddIcon(); k!=GNRRZE  
 return res; _|3TC1N$n  
} ACO4u<M)  
VtiqAh}4  
void CCaptureDlg::AddIcon() =zeLs0s;  
{ 1 \*B.  
 NOTIFYICONDATA data; 6 v^  
 data.cbSize=sizeof(NOTIFYICONDATA); !`[I>:Ex  
 CString tip; 8 QF?W{NK  
 tip.LoadString(IDS_ICONTIP); 8$ZSF92C  
 data.hIcon=GetIcon(0); 1lyOp   
 data.hWnd=GetSafeHwnd(); I<./(X[H:#  
 strcpy(data.szTip,tip); ^r*%BUU9]%  
 data.uCallbackMessage=IDM_SHELL; Gr$*t,ZW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nFnF_  
 data.uID=98; ~e77w\Q0  
 Shell_NotifyIcon(NIM_ADD,&data); VhFRh,J(T  
 ShowWindow(SW_HIDE); =veOVv[Q&/  
 bTray=TRUE; no NF;zT  
} N5s|a5  
/Jf`x>eiH  
void CCaptureDlg::DeleteIcon() v7FRTrqjj  
{ |vN@2h(|"  
 NOTIFYICONDATA data; 8UT%:DlxQ  
 data.cbSize=sizeof(NOTIFYICONDATA); F[D0x26 ^  
 data.hWnd=GetSafeHwnd(); XYHCggy  
 data.uID=98; M |?p3%  
 Shell_NotifyIcon(NIM_DELETE,&data); ?w37vsN  
 ShowWindow(SW_SHOW); V/}>>4  
 SetForegroundWindow(); qzt2j\v  
 ShowWindow(SW_SHOWNORMAL); I"32[?0 (;  
 bTray=FALSE; $Cd;0gdv  
} nP\V1pgA  
DJYXC,r  
void CCaptureDlg::OnChange() !Vr45l  
{ =j+oKGkoCa  
 RegisterHotkey(); Ge:-|*F  
} 9id~NNr7  
o1X/<.0+  
BOOL CCaptureDlg::RegisterHotkey() GGc_9?h  
{ NQ!N"C3u  
 UpdateData(); PR@4' r|a  
 UCHAR mask=0; 7s8<FyFsjd  
 UCHAR key=0; .\~P -{Hd  
 if(m_bControl) w$lfR ,  
  mask|=4; 4nII/cPG  
 if(m_bAlt) $wYuH9(  
  mask|=2; X!rQ@F3  
 if(m_bShift) 8jjk?PUD8  
  mask|=1; '!^E92  
  key=Key_Table[m_Key.GetCurSel()]; N _~KZQ11^  
 if(bRegistered){ sb|3|J6=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q;XHHk  
  bRegistered=FALSE; K>R;~ o  
 }  m-'(27  
 cMask=mask; R8[i XXjku  
 cKey=key; #i+P(xV  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qw<kX*fxrI  
 return bRegistered; [pW1=tI  
} K\KO5A  
"T{~,'T  
  四、小结 adO!Gs9f?  
I,<>%Z|'  
  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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