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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: RO3oP1@B  
  _A~4NW{U7  
  一、实现方法 /CIh2 ]#e  
aBzszp]l+  
  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: 1lpwZ"  
e hA;i.n  
#pragma data_seg("shareddata") 42\-~]  
HHOOK hHook =NULL; //钩子句柄 y8\S}E 0  
UINT nHookCount =0; //挂接的程序数目 @EoZI~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )aX2jSp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %r iK+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey k'PQ} ,Vb  
static int KeyCount =0; 3.)b4T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Zx$ol;Yd  
#pragma data_seg() W#Qmv^StZ  
_aPh(qprc  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 5p +ZD7jK  
b,IocD6v;P  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: H-p;6C<  
efY8M2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1+7GUSIb  
cKey,UCHAR cMask) ,2]X}&{i  
{ [qoXMuC|P  
 BOOL bAdded=FALSE; dgo3'ZO  
 for(int index=0;index<MAX_KEY;index++){ 7FF-*2@  
  if(hCallWnd[index]==0){ _qWliw:0#  
   hCallWnd[index]=hWnd; Gc$gJnQio  
   HotKey[index]=cKey; j.:h5Y^N  
   HotKeyMask[index]=cMask; x3zj ?-  
   bAdded=TRUE; 'r\ V. 4  
   KeyCount++; S:61vD  
   break; !7d*v3)d  
  } %5*@l vy  
 } Ap$y%6  
 return bAdded; > MG>=A  
} wdvLx  
//删除热键 "3F;cCDv]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OD=!&LM  
{ X o{`]  
 BOOL bRemoved=FALSE; #*>E*#?t  
 for(int index=0;index<MAX_KEY;index++){ &Z^ l=YH,  
  if(hCallWnd[index]==hWnd){ tV/Z)fpyH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [/_+>M  
    hCallWnd[index]=NULL; =\t /u  
    HotKey[index]=0; F6hmku>\1  
    HotKeyMask[index]=0; A!63p$VT;  
    bRemoved=TRUE; )J(q49  
    KeyCount--; /1`cRyS  
    break; }!TL2er_  
   } rbZ[!LA  
  } C;~*pMAYe  
 } $Q+s/4\  
 return bRemoved; V|>oGtt7  
} gLsU:aeCT  
tM j1~ R  
Ay{t254/  
  DLL中的钩子函数如下: 7P7b8 ]  
aJqeD'\>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !rhk $ L  
{ eb|i 3.  
 BOOL bProcessed=FALSE; *xR 2)u  
 if(HC_ACTION==nCode) rNl.7O9b  
 {  oK 9'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y]e>E  
   switch(wParam) !Ss HAE|  
   {  OU7 %V)X5  
    case VK_MENU: mceG!@t  
     MaskBits&=~ALTBIT; 1t9.fEmT  
     break; rbqo"g`  
    case VK_CONTROL: ,LOQDIyn  
     MaskBits&=~CTRLBIT; N]YtLa,t  
     break; smQVWs>  
    case VK_SHIFT: _;RVe"tR#  
     MaskBits&=~SHIFTBIT; kWj \x|E  
     break; ,572n[-q  
    default: //judge the key and send message X%9*O[6{  
     break; XUV!C 7  
   } i.1U|Pi  
   for(int index=0;index<MAX_KEY;index++){ uENdI2EY8y  
    if(hCallWnd[index]==NULL) M*pRv  
     continue; e1q"AOV6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R \s!*)  
    { nF)uTk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `3q;~ 9  
     bProcessed=TRUE; DW(~Qdk  
    } $WW)bP d4^  
   } D';eTy Y  
  } 'YSuQP>  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;,O fJ'q^  
   switch(wParam) %G3sjnI;l  
   { xeTgV&$@  
    case VK_MENU: kD.pzx EM  
     MaskBits|=ALTBIT; v$w++3H  
     break; #Tp]^ n  
    case VK_CONTROL: Cpx+qQt0  
     MaskBits|=CTRLBIT; _2vd`k  
     break; H' J|U|  
    case VK_SHIFT: `&$B3)Eb  
     MaskBits|=SHIFTBIT; R UTnc  
     break; .>6 Wv0  
    default: //judge the key and send message Z$KV&.=+  
     break; @\Js8[wS9@  
   } 2)/NFZ  
   for(int index=0;index<MAX_KEY;index++){ g\M5:Qm  
    if(hCallWnd[index]==NULL) F#+.>!  
     continue; Ey&aB YR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HT`1E0G8)  
    { ~y0R'oi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); uL?vG6% ^1  
     bProcessed=TRUE; t0m*PJcF  
    } W$?e<@  
   } 'qv;sB.  
  } k<4P6?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 19d6]pJ5  
   for(int index=0;index<MAX_KEY;index++){ kB\kpW  
    if(hCallWnd[index]==NULL) $(HjI \%l^  
     continue; CHaE;olo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3 EYiQ`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +3^NaY`Y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 gX} g  
   } 5^)_B;.f  
  } qs=tJ ^<<o  
 } (B`sQw@tu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Qu~*46?0  
} <`g3(?   
E(L<L1:"  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: );}t&}  
SQ#7PKH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +2T! z=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ,-rB=|w  
]HvZ$  
  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: 5 d ;|=K  
r[HT9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w+f=RHX"{  
{ G?V"SU.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QD<eQsvV  
 { jQtSwVDr  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,{<p  
  SaveBmp(); d\]O'U)s  
  return FALSE; y @apJ;_R-  
 } v:d9o.h  
 …… //其它处理及默认处理 Q~ 0Dfo w?  
} Gq]d:-7l  
 H+cNX\,  
` Q9+k<  
  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。 g#W_S?  
T{ -2fp8r[  
  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。 3eg5oAZ)G8  
W^xZ+]  
  二、编程步骤 |f NMs  
|Cf mcz(56  
  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"; {j6g@Vd6lx  
-i_En^Fi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; zk>h u<_  
=s[ &;B`s  
  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; &=-PRza%j  
4 iH&:Al  
  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;  wOHEv^,  
.s};F/(diD  
  5、 添加代码,编译运行程序。 dERc}oAh(  
H~m]nV,r  
三、程序代码 #AncOo  
u7muaSy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `-D$Fsl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }aZr ou3E  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ sb'p-Mj  
#if _MSC_VER > 1000 +"L$ed(=nJ  
#pragma once "=A|K~b  
#endif // _MSC_VER > 1000 Vj!WaN_  
#ifndef __AFXWIN_H__ 0$2={s4ze  
#error include 'stdafx.h' before including this file for PCH BW71 s  
#endif .Z5[_'T  
#include "resource.h" // main symbols !0dX@V'r  
class CHookApp : public CWinApp @)z*BmP  
{ v>at/ef  
 public: v*L '{3f  
  CHookApp(); Ed=}PrE  
  // Overrides & s-VSu7  
  // ClassWizard generated virtual function overrides $,P\)</ VR  
  //{{AFX_VIRTUAL(CHookApp) =>YvA>izE  
 public: /c^e& D  
  virtual BOOL InitInstance(); T~:_}J  
  virtual int ExitInstance(); dzxI QlP  
  //}}AFX_VIRTUAL r{V.jZ%p'Z  
  //{{AFX_MSG(CHookApp) "/y|VTV"  
  // NOTE - the ClassWizard will add and remove member functions here. *8206[y  
  // DO NOT EDIT what you see in these blocks of generated code ! 5bBCpNa  
  //}}AFX_MSG DR{] sG  
  DECLARE_MESSAGE_MAP() !Mil?^  
}; _m7c o :  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S.]MOB dt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )G4rJ~#@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;KS`,<^-  
BOOL InitHotkey(); -aN":?8(G  
BOOL UnInit(); irmwc'n]  
#endif cUC17z2D  
._ih$=   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^^ j/  
#include "stdafx.h" _3U|2(E  
#include "hook.h" l4Y1(  
#include <windowsx.h> >p |yf. G  
#ifdef _DEBUG xSOoIsL[  
#define new DEBUG_NEW MHNe>C-!q  
#undef THIS_FILE t 2G1[j!  
static char THIS_FILE[] = __FILE__; CK Mv7  
#endif Z^+a*^w~{  
#define MAX_KEY 100 U IQ 6SvM  
#define CTRLBIT 0x04 K#;txzi  
#define ALTBIT 0x02 CKN8z  
#define SHIFTBIT 0x01 2*YP"Ryh  
#pragma data_seg("shareddata") :}y| 4*z  
HHOOK hHook =NULL; {9'hOi50  
UINT nHookCount =0; :f]!O@.~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J=V yyUB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2 mq%|VG'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey kDg{ >mf  
static int KeyCount =0; wXcMt>3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift (NM6micc  
#pragma data_seg() <>&89E%j'  
HINSTANCE hins; dh?S[|='  
void VerifyWindow(); XqX I(q^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s+N^PX3  
//{{AFX_MSG_MAP(CHookApp) ,0.|P`|w  
// NOTE - the ClassWizard will add and remove mapping macros here. &*ZC0V3  
// DO NOT EDIT what you see in these blocks of generated code! ' XEK&Yi1  
//}}AFX_MSG_MAP #!Ze\fOC  
END_MESSAGE_MAP() taixBNv  
Z]p8IH%~92  
CHookApp::CHookApp() 2| $k`I,  
{ !`Xt8q\r  
 // TODO: add construction code here, oc=tI@W  
 // Place all significant initialization in InitInstance hOl=W |)v  
} `:R-[>5P8  
?.~]mvOR  
CHookApp theApp; bWUS9WT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sxt`0oE  
{ Gzj3Ka  
 BOOL bProcessed=FALSE; &R0OeRToUb  
 if(HC_ACTION==nCode) Jtpa@!M  
 { \ bC}&Iz6  
  if((lParam&0xc0000000)==0xc0000000){// Key up n)Hk8)^8  
   switch(wParam) RAdvIIQp:  
   { T[m ~6  
    case VK_MENU: ^xmZ|f-  
     MaskBits&=~ALTBIT; 2!{N[*)  
     break; ?U$}Rsk{#  
    case VK_CONTROL: fls#LcI9>6  
     MaskBits&=~CTRLBIT; ~X[S<Gi#  
     break; z6Fun  
    case VK_SHIFT: ]|;7R^o3|  
     MaskBits&=~SHIFTBIT; phe"JNML  
     break; IF& PGo  
    default: //judge the key and send message G1p43  
     break; Sr-|,\/O  
   } ( -xR7A  
   for(int index=0;index<MAX_KEY;index++){ 17|@f  
    if(hCallWnd[index]==NULL) bD  d_}  
     continue; Plb}dID"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DqRLx85d1  
    { CN-4-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H kSL5@  
     bProcessed=TRUE; kRQ~hRT6  
    } 8~}s 3j4  
   } d RHlx QUn  
  } 'G52<sF  
  else if((lParam&0xc000ffff)==1){ //Key down 2(hvv-  
   switch(wParam) pEY>A_F  
   { 6xyY+  
    case VK_MENU: a (P^e)<  
     MaskBits|=ALTBIT; TS/Cp{  
     break; TLXhE(o|o  
    case VK_CONTROL: hyM'x*  
     MaskBits|=CTRLBIT; F [r|Y-c]  
     break; 5FZ47m ~{Z  
    case VK_SHIFT: i1tVdbC]  
     MaskBits|=SHIFTBIT; 2\DTJ`Y,  
     break; (y%%6#bd  
    default: //judge the key and send message `:V}1ioX5  
     break; 0T1HQ  
   } jC#`PA3m=  
   for(int index=0;index<MAX_KEY;index++) { ( _B  
   { H\ {E%7^h-  
    if(hCallWnd[index]==NULL) fm[_@L% x  
     continue; C{DlcZ<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9e0C3+)CY  
    { .@fK;/OuC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C{8i7D  
     bProcessed=TRUE; kboizJp  
    } MJy;GzJ O  
   } F\zkyk 4  
  } P\Ai|"=&]  
  if(!bProcessed){ Fecx';_1`  
   for(int index=0;index<MAX_KEY;index++){ mx:J>SPA8  
    if(hCallWnd[index]==NULL) 8e]z6:}'E  
     continue; 0Z@ARMCe|m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E"G:K`Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y]hV-_2+Do  
   } bl$+8 !~  
  } N[#iT&@T}/  
 } jB5>y&+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kA;xAb+U3  
} \8=e |a5`  
y;zt_O/  
BOOL InitHotkey() ,:Rft  
{ w906aV*s  
 if(hHook!=NULL){ tZdwy>;  
  nHookCount++; /#:Rd^  
  return TRUE; R.91v4 J  
 } cxAViWsf  
 else TP{>O%b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S`ax*`  
  if(hHook!=NULL) hO5K\QnRL  
   nHookCount++; "PZYgl  
  return (hHook!=NULL); pESB Il  
} {E;2&d  
BOOL UnInit() w> Tyk#7lw  
{ IXbdS9,>F  
 if(nHookCount>1){ IlcNT_ 5a8  
  nHookCount--; Pd)K^;em  
  return TRUE; z\xiACIc  
 } BM|-GErE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %'RI 3gy  
 if(unhooked==TRUE){ fO[Rf_  
  nHookCount=0; Cf.pTYSl  
  hHook=NULL; NvQY7C  
 } |WD,\=J2  
 return unhooked; pe\Txg6  
} IyrZez  
+io;K]C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YRg=yVo 2  
{ V}vl2o  
 BOOL bAdded=FALSE; %GVEY  
 for(int index=0;index<MAX_KEY;index++){ +^/Nil  
  if(hCallWnd[index]==0){ R88(dEK  
   hCallWnd[index]=hWnd; ,ma Aw}=  
   HotKey[index]=cKey; u@GRN`yn  
   HotKeyMask[index]=cMask; @ChN_gd3!  
   bAdded=TRUE; mXxZM;P[  
   KeyCount++; dNR7e   
   break; LFk5rv'sM0  
  } V-?sek{;  
 } P@gu~!  
 return bAdded; 8+*g4=ws  
} ]&3s6{R  
*%ed;>6:Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  :pA=V  
{ g_rA_~dh  
 BOOL bRemoved=FALSE; e8~62O^  
 for(int index=0;index<MAX_KEY;index++){ 9f@#SB_H  
  if(hCallWnd[index]==hWnd){ 5QqJ I#4~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kGB#2J  
    hCallWnd[index]=NULL; ()+jrrK  
    HotKey[index]=0; W /~||s  
    HotKeyMask[index]=0; w,M1`RsK  
    bRemoved=TRUE; JxX jDYrU  
    KeyCount--; o{ ,ba~$.w  
    break; *Gk<"pEeS  
   } 3Ew"[FUs  
  } a -z23$3  
 } UPfFT^=y  
 return bRemoved; iFAoAw(  
} 377j3dP  
q8'@dH  
void VerifyWindow() ROJ'-Vde9  
{ y9V;IXhDc  
 for(int i=0;i<MAX_KEY;i++){ syWv'Y[k?  
  if(hCallWnd!=NULL){ ;a!h.8UJPI  
   if(!IsWindow(hCallWnd)){ jyY^iQ.2  
    hCallWnd=NULL; (5f5P84x  
    HotKey=0; #Qtg\X  
    HotKeyMask=0; '_TJ"lOZ  
    KeyCount--; >K_$[qP3  
   } /o<}]]YBF  
  } ,wry u|7"$  
 } 7|h3.  
} >.!5M L\  
9E->;0-  
BOOL CHookApp::InitInstance() H3p4,Y}'#  
{ +P> A P&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); X]+(c_i:hC  
 hins=AfxGetInstanceHandle(); *sc0,'0  
 InitHotkey(); wzNt c)~i  
 return CWinApp::InitInstance(); bMK#^ZoH  
} =\ti<  
"6I-]:K-  
int CHookApp::ExitInstance() P-E'cb%ub  
{ h-?q6O/|  
 VerifyWindow(); 0I(GB;E  
 UnInit(); (/9.+V_  
 return CWinApp::ExitInstance(); aIn)']  
} 4y]:Gq z~  
'b=eC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file < tu[cA>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) '?vgp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /JK-}E  
#if _MSC_VER > 1000 /VhE<}OtH  
#pragma once ;EE&~&*w  
#endif // _MSC_VER > 1000 wB1|r{  
U&Sbm~Qi  
class CCaptureDlg : public CDialog K=!ZI/+ju  
{ 2-c U -i4  
 // Construction 8 ACY uN\  
 public: @MlU!oR&  
  BOOL bTray; uDy>xJ|  
  BOOL bRegistered; "a0u-}/D  
  BOOL RegisterHotkey(); ~kSnXJv  
  UCHAR cKey; V(' 'p{  
  UCHAR cMask; ig.6[5a\  
  void DeleteIcon(); pb/{ss+  
  void AddIcon(); ZVL- o<6  
  UINT nCount; 0w'y#U)&8  
  void SaveBmp(); xu_XX#9?b  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor U'h[ {ek  
  // Dialog Data JT.\f,z&  
  //{{AFX_DATA(CCaptureDlg) fo!Lp*'0  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7=QC+XSO  
  CComboBox m_Key; Pw^c2TQ  
  BOOL m_bControl; Ye\*b? 6  
  BOOL m_bAlt; +>i<sk  
  BOOL m_bShift; )bIK0h  
  CString m_Path; S}v{^vR  
  CString m_Number; >F\rBc&  
  //}}AFX_DATA z2s|.M]&-D  
  // ClassWizard generated virtual function overrides <mo^Y k3  
  //{{AFX_VIRTUAL(CCaptureDlg) H(%] Os  
 public: >jrz;r  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Vhbj.eX.)  
 protected: x^='pEt{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LjH&f 4mY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  $D, wO  
  //}}AFX_VIRTUAL FkxhEat8  
  // Implementation TReM8Vd  
 protected: T^(n+lv  
  HICON m_hIcon; Mc$v~|i6  
  // Generated message map functions \MFWK#W  
  //{{AFX_MSG(CCaptureDlg) ,Zcx3C:#  
  virtual BOOL OnInitDialog(); tXG4A$(2&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~Q$c!=   
  afx_msg void OnPaint(); eRl?9  
  afx_msg HCURSOR OnQueryDragIcon(); :AqnWy  
  virtual void OnCancel(); 1 <qVN'[  
  afx_msg void OnAbout(); .X<"pd*@e  
  afx_msg void OnBrowse(); 1n"+~N^\  
  afx_msg void OnChange(); RESGI}u  
 //}}AFX_MSG "13 :VTs[5  
 DECLARE_MESSAGE_MAP() s:jL/%+COZ  
}; ;FgEE%  
#endif YnO1Lf@  
wJeqa  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U+RCQTo  
#include "stdafx.h" R/Dy05nloe  
#include "Capture.h" /m{?o  
#include "CaptureDlg.h" 8|jX ~f  
#include <windowsx.h> R0YC:rAt  
#pragma comment(lib,"hook.lib") Dho^^<`c+  
#ifdef _DEBUG P B6/<n9#  
#define new DEBUG_NEW H:{(CY?t  
#undef THIS_FILE /P8eI3R  
static char THIS_FILE[] = __FILE__; i:Z.;z$1  
#endif QhE("}1  
#define IDM_SHELL WM_USER+1 rD(ep~^M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y/sWy1P7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y^*$PED?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?D )qgH  
class CAboutDlg : public CDialog 1TxhEXB  
{ [vjkU7;7A  
 public: >gi{x|/  
  CAboutDlg();  ]O9f"cj  
  // Dialog Data Uwm[q+sTp  
  //{{AFX_DATA(CAboutDlg) <T.3ZZ%  
  enum { IDD = IDD_ABOUTBOX }; h'YcNkM 2>  
  //}}AFX_DATA Aya;ycsgE  
  // ClassWizard generated virtual function overrides /hEGk~  
  //{{AFX_VIRTUAL(CAboutDlg) $hE'b9qx  
 protected: LN6JH!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VGDEP!)-8  
  //}}AFX_VIRTUAL z5*O@_r+.b  
  // Implementation D16;6K'{  
 protected: rW%'M#! =  
  //{{AFX_MSG(CAboutDlg) ~tj7zI6  
  //}}AFX_MSG P2:Q+j:PX  
  DECLARE_MESSAGE_MAP() X"khuyT_  
}; \q`+  
?xTeio44  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >'1Q"$;  
{ +!V%Q  
 //{{AFX_DATA_INIT(CAboutDlg)  DIu72\  
 //}}AFX_DATA_INIT gmAKW4(  
} z#E,96R  
NW>:Lz ?"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~ {7N TW  
{ 2|NyAtPb5  
 CDialog::DoDataExchange(pDX); QsF<=b~  
 //{{AFX_DATA_MAP(CAboutDlg) \FY De  
 //}}AFX_DATA_MAP XOU-8;d  
} x#gmliF  
q}A3"$-F  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +q=jB-eIx  
 //{{AFX_MSG_MAP(CAboutDlg) S~(VcC$K  
 // No message handlers -JO46 #m  
 //}}AFX_MSG_MAP o(SJuZC/U  
END_MESSAGE_MAP() U#1yl6e\I  
&lfF!   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Pymh^i  
: CDialog(CCaptureDlg::IDD, pParent) k#r7&Y  
{ Y)5uK:)^  
 //{{AFX_DATA_INIT(CCaptureDlg) rnBeL _8C  
  m_bControl = FALSE; 4a\+o]  
  m_bAlt = FALSE; {)[g  
  m_bShift = FALSE; B l/e>@M  
  m_Path = _T("c:\\"); 2u;fT{(  
  m_Number = _T("0 picture captured."); YIk6:W{  
  nCount=0; | v'5*n9  
  bRegistered=FALSE; +p}Xmn  
  bTray=FALSE; "u]Fl+c  
 //}}AFX_DATA_INIT r~Ubgd ]U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rMFZ#38d  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y(yJ|y&  
} i\z0{;f|GX  
kuud0VWJ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) adE0oXQH"  
{ IlL   
 CDialog::DoDataExchange(pDX); .&Gtw _  
 //{{AFX_DATA_MAP(CCaptureDlg) IguG0 3:.N  
  DDX_Control(pDX, IDC_KEY, m_Key); @dKf]&h%%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }N9a!,{P=b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]~M {@h!<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9*Twx&  
  DDX_Text(pDX, IDC_PATH, m_Path); m1; <T@  
  DDX_Text(pDX, IDC_NUMBER, m_Number); k 5r*?Os  
 //}}AFX_DATA_MAP v;qL? _:=c  
} vHe.+XY  
.MPOUo/e  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O xaua  
//{{AFX_MSG_MAP(CCaptureDlg) 4wD^?S!p  
 ON_WM_SYSCOMMAND() EGr5xR-  
 ON_WM_PAINT() k+G4<qw  
 ON_WM_QUERYDRAGICON() vlyNQ7"%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) CKt~#$ I%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h?tV>x/Fu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {Om3fSk:  
//}}AFX_MSG_MAP ^g){)rz|  
END_MESSAGE_MAP() p;Ok.cXVp  
0 S8{VZpy  
BOOL CCaptureDlg::OnInitDialog()  !3M!p&  
{ 95&sFT C  
 CDialog::OnInitDialog(); 4GejT(U  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4i&!V9@:  
 ASSERT(IDM_ABOUTBOX < 0xF000); pR7G/]U$A  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ct/THq  
 if (pSysMenu != NULL) Z$K%@q,10+  
 { {cHTg04  
  CString strAboutMenu; K{h]./%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Cu<ojN- $  
  if (!strAboutMenu.IsEmpty()) .z7f_KX^  
  { pnb$lpxt  
   pSysMenu->AppendMenu(MF_SEPARATOR); FsZEB/c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); F qyJ*W\1  
  } dsoRPX']=  
 } 'N/%SRk  
 SetIcon(m_hIcon, TRUE); // Set big icon JkEQ@x  
 SetIcon(m_hIcon, FALSE); // Set small icon -;.fU44O[#  
 m_Key.SetCurSel(0); dM.Ow!j  
 RegisterHotkey(); $4) g uG)  
 CMenu* pMenu=GetSystemMenu(FALSE); m,fr?d/;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Qnc S&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); E0Xu9IW/A  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S?WUSx*N  
 return TRUE; // return TRUE unless you set the focus to a control ArKrsI#H-  
} zMg^2{0L  
~2 ;y4%K  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) = $Yk8,  
{ ;b2>y>?[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Raqr VC  
 { {lw ec"{  
  CAboutDlg dlgAbout; ~a)2 0  
  dlgAbout.DoModal(); r|$g((g  
 } "d*  
 else dQ o$^?  
 { ht!:e>z&4  
  CDialog::OnSysCommand(nID, lParam); goWt!,&f  
 } .SFwjriZ  
} R dzIb-  
X,Q(W0-6$u  
void CCaptureDlg::OnPaint() %j`]x -aOz  
{ imuHSxcaV  
 if (IsIconic()) ~.SU$  
 { 49>yIuG  
  CPaintDC dc(this); // device context for painting +eat,3Ji  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  %tjEVQa  
  // Center icon in client rectangle Q'LU?>N)/  
  int cxIcon = GetSystemMetrics(SM_CXICON); |0Kt@ AJY  
  int cyIcon = GetSystemMetrics(SM_CYICON); +o5rR|)M+  
  CRect rect;  KX@Fgs  
  GetClientRect(&rect); [)KfRk?};2  
  int x = (rect.Width() - cxIcon + 1) / 2; 32J  
  int y = (rect.Height() - cyIcon + 1) / 2; r8E!-r}rno  
  // Draw the icon LDNUywj@w  
  dc.DrawIcon(x, y, m_hIcon);  n6dg   
 } 'c]&{-w<i  
 else 7wiu%zfa:=  
 { riQ?'!a7  
  CDialog::OnPaint(); HxAa,+k  
 } z(` kWF1<  
} OTm"Iwzu@  
Ds$;{wl#x  
HCURSOR CCaptureDlg::OnQueryDragIcon() F U%b"gP^  
{ |9@;Muq;  
 return (HCURSOR) m_hIcon; R 1\]Y  
} }'JPA&h|  
!h;VdCCi#  
void CCaptureDlg::OnCancel() =!2   
{ D-/A>  
 if(bTray) )oCF| 2qc  
  DeleteIcon(); U^S0H(>  
  CDialog::OnCancel(); n+w>Qz'  
} @B <_h+  
WbF\=;$=7  
void CCaptureDlg::OnAbout() jKs8i$q  
{ C8-q<t#SF  
 CAboutDlg dlg; L T!X|O.  
 dlg.DoModal(); q1j[eru  
} a$-ax[:\sm  
_t7A'`Dh]  
void CCaptureDlg::OnBrowse() g.qp _O  
{ hHQt4 r'd  
 CString str; #=c%:{O{4R  
 BROWSEINFO bi; :>u{BG;=79  
 char name[MAX_PATH]; e!y t<[ph  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0Oq1ay^  
 bi.hwndOwner=GetSafeHwnd(); mNzZ/*n:  
 bi.pszDisplayName=name; e78}  
 bi.lpszTitle="Select folder"; 6C=.8eP  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; nfEk,(:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); xae7#d0  
 if(idl==NULL) q}lSnWY[[  
  return; HvU)GJ u b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); yCVBG  
 str.ReleaseBuffer(); :nn'>  
 m_Path=str; xMu6PM<l  
 if(str.GetAt(str.GetLength()-1)!='\\') )XWL'':bF  
  m_Path+="\\"; N[%IrN3  
 UpdateData(FALSE); Ex{]<6UAu  
} `K.yE0^i  
o>h>#!e  
void CCaptureDlg::SaveBmp() G5Nub9_*X  
{ y+_U6rv[  
 CDC dc; 4ai3@f5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); G9TUU.T  
 CBitmap bm; 5Dd;?T>  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z(cgI5Pu  
 int Height=GetSystemMetrics(SM_CYSCREEN); G}x^PJJt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7Udr~ 0_)  
 CDC tdc; g|Cnj  
 tdc.CreateCompatibleDC(&dc); y[# U/2  
 CBitmap*pOld=tdc.SelectObject(&bm); Z~ (QV0}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~EymD *  
 tdc.SelectObject(pOld); =6hf'lP  
 BITMAP btm; /$KW$NH4z  
 bm.GetBitmap(&btm); pbNVj~#6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2P*O^-zRp  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Qoc-ZC"<6  
 BITMAPINFOHEADER bih; TqC"lO>:Q  
 bih.biBitCount=btm.bmBitsPixel; ;3_'{  
 bih.biClrImportant=0; (<t)5?@%  
 bih.biClrUsed=0; f#?R!pR  
 bih.biCompression=0; ^"I!+Teb  
 bih.biHeight=btm.bmHeight; P]G2gDO  
 bih.biPlanes=1; lnhZ!_  
 bih.biSize=sizeof(BITMAPINFOHEADER); )!Bv8&;e  
 bih.biSizeImage=size; 2zAS \Y  
 bih.biWidth=btm.bmWidth; lEJTd3dMi  
 bih.biXPelsPerMeter=0; 3UEh%Ho  
 bih.biYPelsPerMeter=0; eL*Edl|#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QCMF_;aNI  
 static int filecount=0; $t^`Pt*:u  
 CString name; 6 [IiJhVL  
 name.Format("pict%04d.bmp",filecount++); "xKJ?8   
 name=m_Path+name; zB4gnVhus|  
 BITMAPFILEHEADER bfh; juM?y'A  
 bfh.bfReserved1=bfh.bfReserved2=0; .nnAI@7E  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _nF_RpS  
 bfh.bfSize=54+size; d+kIof,  
 bfh.bfOffBits=54; e |!i1e!  
 CFile bf; vU _#(jZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b=sc2 )3?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .Q7z<Q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o Vs&r?\Z  
  bf.WriteHuge(lpData,size); `R\0g\  
  bf.Close(); :?zOLw?(  
  nCount++; i4l?q#X  
 } 6w' ^,V  
 GlobalFreePtr(lpData); D0~mu{;c$  
 if(nCount==1)  I2b[  
  m_Number.Format("%d picture captured.",nCount); N9hBGa$  
 else D n^RZLRhy  
  m_Number.Format("%d pictures captured.",nCount); DLVf7/=3~  
  UpdateData(FALSE); q~lmOT~E  
} Ood&cP'c  
#u>JCPz  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k&^fIz  
{ crUXpD  
 if(pMsg -> message == WM_KEYDOWN) dS-l2 $n  
 { Ma$b(4dB  
  if(pMsg -> wParam == VK_ESCAPE) :`d& |BB  
   return TRUE; +=*ZH `qX  
  if(pMsg -> wParam == VK_RETURN) F2#^5s(  
   return TRUE; (RQ kwu/  
 } V\A?1   
 return CDialog::PreTranslateMessage(pMsg); {?82>q5F  
} |zSkQ_?54  
'_2~8w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >qOhzbAH{<  
{ z7}@8F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [/I4Pe1Yj%  
  SaveBmp(); arnu|paw  
  return FALSE; n@xU5Q  
} 0@z78h=h  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |<OZa;c+  
 CMenu pop; 3 *ZE``  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); n-uoY<;hp  
 CMenu*pMenu=pop.GetSubMenu(0); -*3wNGh {  
 pMenu->SetDefaultItem(ID_EXITICON); \'shnzs  
 CPoint pt; w zF"^CJ  
 GetCursorPos(&pt); B>Mk "WjQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y.ic=<0H  
 if(id==ID_EXITICON) +Oo>V~  
  DeleteIcon(); x.!%'{+ {  
 else if(id==ID_EXIT) `6'fX[j5  
  OnCancel(); ^;M!u8[  
 return FALSE; e4t'3So  
} k#U?Xs>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m)&2zV/Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) wj5{f5 RWV  
 AddIcon(); U:p<pTnMR  
 return res; (JOge~U  
} 1aKY+4/G  
-(dc1?COi  
void CCaptureDlg::AddIcon() [W` _`  
{ 2\_}81 hM  
 NOTIFYICONDATA data; 26j ; RV  
 data.cbSize=sizeof(NOTIFYICONDATA); Y2}\~I0  
 CString tip; Go8 m  
 tip.LoadString(IDS_ICONTIP); :\>@yCD  
 data.hIcon=GetIcon(0); f$R]m2  
 data.hWnd=GetSafeHwnd(); \ 7jK6;R<  
 strcpy(data.szTip,tip); N,L$+wm  
 data.uCallbackMessage=IDM_SHELL; C/!kMMh>vV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nF]lSg&]X  
 data.uID=98; c<|;<8ew  
 Shell_NotifyIcon(NIM_ADD,&data); ftRf~5d2  
 ShowWindow(SW_HIDE); +eQg+@u  
 bTray=TRUE; SD |5v*  
} *1|&uE&_R  
a=Pl3Uo  
void CCaptureDlg::DeleteIcon() du  Pzt  
{ U2seD5I  
 NOTIFYICONDATA data; YFeF(k!!n  
 data.cbSize=sizeof(NOTIFYICONDATA); }}@x x&  
 data.hWnd=GetSafeHwnd(); id'E_]r  
 data.uID=98; J#"@~Q+a`@  
 Shell_NotifyIcon(NIM_DELETE,&data); ~0eJ6i  
 ShowWindow(SW_SHOW); r1f##  
 SetForegroundWindow(); !c/G'se  
 ShowWindow(SW_SHOWNORMAL);  s'RE~,  
 bTray=FALSE; XX+%:,G  
} KFx4"f%  
63 F@F t  
void CCaptureDlg::OnChange() 4@- 'p  
{ 0@k)C z[0;  
 RegisterHotkey(); *>I4X=  
} Xf(H_&K  
qf-0 | w  
BOOL CCaptureDlg::RegisterHotkey() rZEL7{  
{ Dn1aaN6  
 UpdateData(); f5'Cq)Vw_  
 UCHAR mask=0; _NA[g:DZ&O  
 UCHAR key=0; ye4 T2=  
 if(m_bControl) %v5IR  
  mask|=4; HJ~0_n&  
 if(m_bAlt) rE)lt0mkv  
  mask|=2; 9mZ[SQf  
 if(m_bShift) (Rj'd>%c  
  mask|=1; $DBJ"8n2  
  key=Key_Table[m_Key.GetCurSel()]; s|FfBG  
 if(bRegistered){ bLuAe EA  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WKek^TW4HE  
  bRegistered=FALSE; >UlAae44  
 } $}+t|`*q8]  
 cMask=mask;  UDl[  
 cKey=key; ,ELbm  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \iVb;7r)9:  
 return bRegistered; vr/*z euA  
} O1[`2kj^HB  
ai0am  
  四、小结 Q*&k6A"jx  
3 vr T`  
  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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