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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: LS{g=3P0  
  {6!Mf+Xq  
  一、实现方法 yb2*K+Kv  
9t(B{S  
  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: t48(,  
i,NN"  
#pragma data_seg("shareddata") 5r.\maW  
HHOOK hHook =NULL; //钩子句柄 y, tA~  
UINT nHookCount =0; //挂接的程序数目 KFor~A# D  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &THM]3:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "!i7U2M'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey VHsuC$3W  
static int KeyCount =0; ;'{:}K=h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .L0pS.=LT  
#pragma data_seg() w6y?D<  
:W<ag a;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。 $g$~TuA w  
[CGvM {  
  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: BA' ($D>  
[aU#"k)M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (pm]U7  
cKey,UCHAR cMask) e,>L&9] ZI  
{ F=kD/GCB  
 BOOL bAdded=FALSE; ;TD<\1HJT=  
 for(int index=0;index<MAX_KEY;index++){ >V;JI;[  
  if(hCallWnd[index]==0){ 41>Bm*if  
   hCallWnd[index]=hWnd; :Qh5ZO&G0  
   HotKey[index]=cKey; HNxJ`x~Z~  
   HotKeyMask[index]=cMask; "ZE JL.Wy  
   bAdded=TRUE; ELeR5xT  
   KeyCount++; M. 1R]x( |  
   break; -N(y+~wN  
  } :!;BOCTYI  
 } $74ZC M  
 return bAdded; XA5gosq  
} F'lG=c3N  
//删除热键 z kYl IUD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g-U'{I5F  
{ O?p.kf{b  
 BOOL bRemoved=FALSE; Mc oHV]x  
 for(int index=0;index<MAX_KEY;index++){ jb$sIZ%i  
  if(hCallWnd[index]==hWnd){ G1  %c<1Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }UMg ph:2:  
    hCallWnd[index]=NULL; EMU~gwPR  
    HotKey[index]=0; 3!`Pv ?|o  
    HotKeyMask[index]=0; 8)&yjY  
    bRemoved=TRUE;  %1<No/  
    KeyCount--; r+3V+:f  
    break; Vj_(55WQ  
   } g3 6oEz~|  
  } 8Y3c,p/gS>  
 }  T/p}Us  
 return bRemoved;  V7%G?  
} C(b"0>  
.*:SZ3v  
9Gfm?.O5  
  DLL中的钩子函数如下: s@OCj0'l  
Q4{%)}2$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) daE/v.a4|  
{ @4^5C-  
 BOOL bProcessed=FALSE; >~_y\  
 if(HC_ACTION==nCode) 9G` 2t~%  
 { "zc@(OA[z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 N5#qox$D  
   switch(wParam) }>b4s!k,  
   {   4%LG9hS  
    case VK_MENU: YR'?fr  
     MaskBits&=~ALTBIT; w-FZ`OA`D  
     break; 9*GwW&M%1_  
    case VK_CONTROL: AT}}RE@vq  
     MaskBits&=~CTRLBIT; p/ pVMR  
     break; A3*ti!X<6  
    case VK_SHIFT: gF^l`1f"  
     MaskBits&=~SHIFTBIT; F#7ZR*ZB1  
     break; h#@l'Cye  
    default: //judge the key and send message B~^MhX +j  
     break; *#;8mM  
   } )|@b GEk  
   for(int index=0;index<MAX_KEY;index++){ iN8?~T}w  
    if(hCallWnd[index]==NULL) EXH{3E54)`  
     continue; D-9zg\\'`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?aEBS  
    { W:O<9ZbQ_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F7^8Ej9*a  
     bProcessed=TRUE; s0H_Y'  
    } C$){H"#  
   } JaKR#Y$+~  
  } 0){%4  
  else if((lParam&0xc000ffff)==1){ //有键按下 2hEB?ZAQZ  
   switch(wParam) V2g,JFp&  
   { >aW|W!.  
    case VK_MENU: il<D e]G  
     MaskBits|=ALTBIT; /_@S*=T5  
     break; nL5Gr:SLo  
    case VK_CONTROL: 7{RI`Er`  
     MaskBits|=CTRLBIT; E:V&:9aQ@  
     break; !H{)L@f  
    case VK_SHIFT: Iwi>yx8  
     MaskBits|=SHIFTBIT; X_C9Z  
     break; ;_amgRP7$  
    default: //judge the key and send message TP{lt6wws(  
     break; 2FD[D `n]f  
   } tBtJRi(  
   for(int index=0;index<MAX_KEY;index++){ s=(~/p#M  
    if(hCallWnd[index]==NULL) #i-!:6sLA  
     continue; m?'5*\(ST  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J_}&Btb)e  
    { Xx[ L K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |w- tkkS  
     bProcessed=TRUE; E"!9WF(2t5  
    } ?=jmyDXH!  
   } kMKI=>s+  
  } uEWWY t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1B'i7  
   for(int index=0;index<MAX_KEY;index++){ ?u"(^93f  
    if(hCallWnd[index]==NULL)  twz  
     continue; l~Kn-S{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]w]Swt2n  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VXQS~#dQj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %2^C  
   } 5IW^^<kiu  
  } ?4Lb*{R  
 } [@kzC/Jq3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _Ta9rDSP]  
} ~^lQ[x  
?*u)T%S  
  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: ($E(^p% O  
FRF3V>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M~I M;my  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2]eh[fRQ  
po*s  
  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: $} TqBBe   
UYW%% 5p?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v!t*Ng  
{ |o~FKy1'z\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e~$MIHBY]  
 { $^IuE0.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 H|0B*i@81  
  SaveBmp(); -kES]P?2  
  return FALSE; idGkX ?  
 } BT 98WR"\  
 …… //其它处理及默认处理 t"2WJ-1k}  
} LoOyqJ,  
l6xC'c,jg  
&|%z!x6f  
  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。 h?.6e9Y4  
R" 5/  
  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。 ~Cks)mJs  
Z@ h<xo*r  
  二、编程步骤 qz E/n   
QoDWR5*^D  
  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"; a: iIfdd4'  
hOfd<k\A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +hY/4Tx<  
I-kM~q_  
  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; U'";  
6TfL|W<  
  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; zN].W\("\  
P{(m:`N  
  5、 添加代码,编译运行程序。 qw%4j9}  
NxNR;wz>l  
三、程序代码 @MtF^y  
^>GL<1 1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <^R\N#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;Bc f~[ErM  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H4k`wWOk  
#if _MSC_VER > 1000 PfnhE>[>cf  
#pragma once >gFF>L>  
#endif // _MSC_VER > 1000 _ H$ Cm  
#ifndef __AFXWIN_H__ TT .EQv5  
#error include 'stdafx.h' before including this file for PCH zY[6Ia{L  
#endif -5p=gO  
#include "resource.h" // main symbols XS9k&~)*  
class CHookApp : public CWinApp s7FqE>#c0  
{ J9/9k  
 public: D: JGd$`  
  CHookApp(); *X%`MN  
  // Overrides BTjF^&`  
  // ClassWizard generated virtual function overrides x9Gm)~  
  //{{AFX_VIRTUAL(CHookApp) Ip8 Ap$  
 public: *2 MUG h  
  virtual BOOL InitInstance(); Q;m .m2  
  virtual int ExitInstance(); <FS/'[P  
  //}}AFX_VIRTUAL s<:"rw`  
  //{{AFX_MSG(CHookApp) SnQ$  
  // NOTE - the ClassWizard will add and remove member functions here. d#ld*\|  
  // DO NOT EDIT what you see in these blocks of generated code ! 8k_,Hni  
  //}}AFX_MSG S wC,=S  
  DECLARE_MESSAGE_MAP() *sAoYx  
}; xhUQ.(S`r6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8Y5* 1E*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CG=#rc]vz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eqeVz`  
BOOL InitHotkey(); ]P(Eo|)m  
BOOL UnInit(); 4LBjqv,P  
#endif Bq R;d  
l,6="5t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1)u= &t,  
#include "stdafx.h" )/ s 9ty  
#include "hook.h" rxP^L(q0*  
#include <windowsx.h> q n=6>wP  
#ifdef _DEBUG gjo\g P@  
#define new DEBUG_NEW  `Yoafa  
#undef THIS_FILE bnD>/z]E  
static char THIS_FILE[] = __FILE__; _<t3~{qUT  
#endif YLPiK  
#define MAX_KEY 100 |8+<qgQ  
#define CTRLBIT 0x04 @D0Ut9)  
#define ALTBIT 0x02 iY;)R|6  
#define SHIFTBIT 0x01 ucoBeNsHx  
#pragma data_seg("shareddata") =b`>ggw#  
HHOOK hHook =NULL; (5km]`7z  
UINT nHookCount =0; aEZl ICpU7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cB -XmX/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT EVb'x Zr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %NeKDE  
static int KeyCount =0; !Toq~,a8?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Fi7pq2  
#pragma data_seg() ,{'~J @  
HINSTANCE hins; K\?vTgc(  
void VerifyWindow(); >IoOCQQ*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !m_'<=)B4~  
//{{AFX_MSG_MAP(CHookApp) z w5EaY  
// NOTE - the ClassWizard will add and remove mapping macros here. q#OLb"bTr  
// DO NOT EDIT what you see in these blocks of generated code! ).v;~yE   
//}}AFX_MSG_MAP OEB_LI'  
END_MESSAGE_MAP() {\]SvoJnJ  
X+&@$v1  
CHookApp::CHookApp() diTzolY7  
{ `awk@  
 // TODO: add construction code here, QZh8l-!#5  
 // Place all significant initialization in InitInstance dR$P-V\y`%  
} o"[qPZd>  
CZ]+B8Pl(x  
CHookApp theApp; /3Se*"u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +pf 7  
{ B"+Ygvxb  
 BOOL bProcessed=FALSE; 3l4k2  
 if(HC_ACTION==nCode) )}paQmy#  
 { >Pv%E  
  if((lParam&0xc0000000)==0xc0000000){// Key up dZnq 96<:|  
   switch(wParam) N.&)22<m9  
   { uX.Aq@j  
    case VK_MENU: {Ziq~{W_  
     MaskBits&=~ALTBIT; X^aujK^@  
     break; QF%@MK0zC  
    case VK_CONTROL: |$1j;#h  
     MaskBits&=~CTRLBIT; (%I`EAR  
     break; Lo;T\C N  
    case VK_SHIFT: =faV,o&{`  
     MaskBits&=~SHIFTBIT; 7Kh+m@q.  
     break; tM@TT@.t~  
    default: //judge the key and send message pdtK3Pf  
     break; +d#ZSNu/  
   } q=96Ci_a  
   for(int index=0;index<MAX_KEY;index++){ C}+(L3Z  
    if(hCallWnd[index]==NULL) jriliEz;f  
     continue; >aa-ix &  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Nb B`6@r  
    { ~hM4({/QN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0D.YO<PU  
     bProcessed=TRUE; ->93.sge  
    } snj+-'4T  
   }  \f  
  } z&-3H/   
  else if((lParam&0xc000ffff)==1){ //Key down @x{;a9y  
   switch(wParam) eRv3ZHH  
   { s \kkD *  
    case VK_MENU: -Tz/ZOJ  
     MaskBits|=ALTBIT; (U|W=@8`  
     break; ,Hj=]e2?  
    case VK_CONTROL: lW>bX C  
     MaskBits|=CTRLBIT; a nIdCOh  
     break; |@d7o]eM|  
    case VK_SHIFT: <Pf W  
     MaskBits|=SHIFTBIT; '<XG@L  
     break; n*_FC  
    default: //judge the key and send message ri\r%x  
     break; {},G xrQm  
   } E-! `6  
   for(int index=0;index<MAX_KEY;index++) 6oJ~Jdn'  
   { ZEApE+m  
    if(hCallWnd[index]==NULL) ?[VS0IBS  
     continue; eb:uh!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -y$|EOi?  
    { tWc!!Hf2j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nq_sbli  
     bProcessed=TRUE; \UK  9  
    } L TO1LAac  
   } uFECfh  
  } 6'*?zZrz  
  if(!bProcessed){ k6*2= xK~  
   for(int index=0;index<MAX_KEY;index++){ Ng;E]2"  
    if(hCallWnd[index]==NULL) W%Ky#!\-  
     continue; .;$/nz6vk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j_ :4_zdBy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Iy`Zh@"~  
   } 3YRhqp"E  
  } gv<9XYByt  
 } 4}?Yp e-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A u(Ngq  
} * =r,V  
v?Y9z!M  
BOOL InitHotkey() +gT?{;3[i  
{ o1kLT@VCl  
 if(hHook!=NULL){ 5N ' QG<jE  
  nHookCount++; <$7*yV  
  return TRUE; c t,p?[Q  
 } tJg   
 else yQCfn1a)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =DF7l<&km  
  if(hHook!=NULL) [n66ZY#U]  
   nHookCount++; +KD~/}C%-  
  return (hHook!=NULL); 4d6F4G4U  
} = u73AM}  
BOOL UnInit() ZEHz/Y%  
{ 5z#>>|1>#  
 if(nHookCount>1){ -*tP_=-Dg  
  nHookCount--; J^1w& 40  
  return TRUE; a"hlPJlG  
 } WO_cT26Y  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &a-:ZA@  
 if(unhooked==TRUE){ 6)DYQ^4y  
  nHookCount=0; c< \:lhl  
  hHook=NULL; I_eYTy-a`1  
 } b/ur!2yr  
 return unhooked; P3@[x  
} OGh b Ha  
v>0xHQD*<M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TX8,+s+  
{ @\[&_DZ  
 BOOL bAdded=FALSE; gxL5%:@  
 for(int index=0;index<MAX_KEY;index++){ HiVF<tN  
  if(hCallWnd[index]==0){ | \Qr cf  
   hCallWnd[index]=hWnd; :2  
   HotKey[index]=cKey; g^8bY=* .  
   HotKeyMask[index]=cMask; '&s:,o-p  
   bAdded=TRUE; tjO||]I  
   KeyCount++; dkRJ^~  
   break; c+-L>dsss  
  } WvNX%se]3  
 } QbpRSdxy`$  
 return bAdded; Dth<hS,2J  
} ^=Up U B  
UAH} ])U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `@=}5 9+|  
{ DA[-( s  
 BOOL bRemoved=FALSE; lusINILc  
 for(int index=0;index<MAX_KEY;index++){ 1 !OQxY}f  
  if(hCallWnd[index]==hWnd){ nQg6 j Zf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %,>> <8  
    hCallWnd[index]=NULL; /1Rm^s)2z  
    HotKey[index]=0; cdzMao  
    HotKeyMask[index]=0; ^K&& O {  
    bRemoved=TRUE; t~XwF(";  
    KeyCount--; a<c %Xy/  
    break; `^(6{p ?  
   } UHweV:(|T  
  } 0.|tKetHq  
 } sDWX} NV  
 return bRemoved; _vvnxG!x&  
} h^34{pKDn  
hRGK W  
void VerifyWindow() jw#'f%*  
{ ToDN^qE+  
 for(int i=0;i<MAX_KEY;i++){ b)'Ew27  
  if(hCallWnd!=NULL){ bIe>j*VPh@  
   if(!IsWindow(hCallWnd)){ nM)]  
    hCallWnd=NULL; ){R_o5  
    HotKey=0; ?$F:S%eH  
    HotKeyMask=0; 0XL x@FYn  
    KeyCount--; PS(9?rX#+  
   } ]@M$.msg@  
  } -4Y}Y5 9\  
 } w doA>a?q  
} CI$F#j  
vF3>nN(]  
BOOL CHookApp::InitInstance() R7Hn8;..  
{ OsvAm'B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y( D d7`c  
 hins=AfxGetInstanceHandle(); LK/gG6n5M0  
 InitHotkey(); XQ,I Ej|  
 return CWinApp::InitInstance(); =F8uuYX%m  
} uZ%b6+(  
6"eGd"  
int CHookApp::ExitInstance() Xp._B4g  
{ $fuFx8`2W  
 VerifyWindow(); uoaF(F-  
 UnInit(); 8uS1HE\%  
 return CWinApp::ExitInstance(); NzNAhlXj3  
} xg\M9&J  
S #&HB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h'w9=Pk~6y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8~\Fpz|Og  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qs 52)$  
#if _MSC_VER > 1000 Zdj~B1  
#pragma once ;Z C18@  
#endif // _MSC_VER > 1000 DQH _@-q  
aztP`S$h  
class CCaptureDlg : public CDialog 4D9l Za}  
{ XC0G5rtB  
 // Construction lb`P9mbr+  
 public: bo\|mvB~  
  BOOL bTray; W&BwBp]K  
  BOOL bRegistered; %w6> 3#e  
  BOOL RegisterHotkey();  CG$S?  
  UCHAR cKey; HSp*lHU  
  UCHAR cMask; RE!MX>sOEq  
  void DeleteIcon(); H*EQ%BLW^,  
  void AddIcon(); DT n=WGm)  
  UINT nCount; Y5cUOfYT  
  void SaveBmp(); 4 lJ@qhV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor RAXqRP,iw  
  // Dialog Data 6bo,x  
  //{{AFX_DATA(CCaptureDlg) : gv[X  
  enum { IDD = IDD_CAPTURE_DIALOG }; aW4tJN%!  
  CComboBox m_Key; zO9|s}J8q  
  BOOL m_bControl; WO^sm Ck  
  BOOL m_bAlt; ./J.OU1  
  BOOL m_bShift; OQ W#BBet@  
  CString m_Path; 1\kOjF)l  
  CString m_Number; J A4'e@  
  //}}AFX_DATA d q"b_pr;  
  // ClassWizard generated virtual function overrides X f!Bsp#\g  
  //{{AFX_VIRTUAL(CCaptureDlg) RZm5[n  
 public: 52wq<[#tK  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dSk\J[D  
 protected: r"Pj ,}$A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %49@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _6^vxlF  
  //}}AFX_VIRTUAL qJ#?=ITE  
  // Implementation |3Oe2qb  
 protected: 5j{o0&=_$  
  HICON m_hIcon; cJj0`@0f  
  // Generated message map functions 7+#^:;19`  
  //{{AFX_MSG(CCaptureDlg) </:f-J%U/  
  virtual BOOL OnInitDialog(); RyIr_:&-~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PIB|&I|p  
  afx_msg void OnPaint(); N;Hrc6nin^  
  afx_msg HCURSOR OnQueryDragIcon(); @ g~kp  
  virtual void OnCancel(); b (;"p-^  
  afx_msg void OnAbout(); $axaI$bE  
  afx_msg void OnBrowse(); zd>[uIOR  
  afx_msg void OnChange(); Ml+.\'r  
 //}}AFX_MSG .y+>-[j?B  
 DECLARE_MESSAGE_MAP() MvL%*("4b  
}; m\"M`o B  
#endif r7JILk  
8Tt2T} Y  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file dZ`nv[]k~  
#include "stdafx.h" pc:K5 -Os  
#include "Capture.h" q|=tt(}G  
#include "CaptureDlg.h" <u u1e@P  
#include <windowsx.h> &=X1kQG  
#pragma comment(lib,"hook.lib") nH NMoA  
#ifdef _DEBUG Ny\iRU)fN  
#define new DEBUG_NEW $C,f>^1  
#undef THIS_FILE H Y.,f_m  
static char THIS_FILE[] = __FILE__; <4C`^p  
#endif JNuo+Pq  
#define IDM_SHELL WM_USER+1 7&'^H8V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _Dwn@{[(8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hKt AvTg  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \dbpC Z  
class CAboutDlg : public CDialog L4 x  
{ /uW6P3M  
 public: f!xIMIl)+  
  CAboutDlg(); 1PjSa4  
  // Dialog Data Ibd7[A\  
  //{{AFX_DATA(CAboutDlg) W{1=O)w  
  enum { IDD = IDD_ABOUTBOX }; 0*B_$E06  
  //}}AFX_DATA (.<Gde#  
  // ClassWizard generated virtual function overrides e>uV8!u  
  //{{AFX_VIRTUAL(CAboutDlg) &tLg}7?iB  
 protected: s:jr/ j!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !i.`m-J*  
  //}}AFX_VIRTUAL |X~T</{8i  
  // Implementation V6BCW;   
 protected: K )KE0/ n  
  //{{AFX_MSG(CAboutDlg) g3e\'B'  
  //}}AFX_MSG @D[;$YEk  
  DECLARE_MESSAGE_MAP() X7NRQ3P@  
}; ',*I=JW;  
TnPdpynP  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HPVT$EJ  
{ oopTo51,a  
 //{{AFX_DATA_INIT(CAboutDlg) ,UH`l./3DX  
 //}}AFX_DATA_INIT o=w& &B  
} B%^B_s  
<4rF3 aB-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 67/hhO  
{ 2EQ:mjxk  
 CDialog::DoDataExchange(pDX); `r+e! o  
 //{{AFX_DATA_MAP(CAboutDlg) v|t^th,  
 //}}AFX_DATA_MAP rZ w&[ G  
} Ij@YOt  
r,[vXxMy(;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) '`/1?,=  
 //{{AFX_MSG_MAP(CAboutDlg) dH&N<  
 // No message handlers ?!Rl p/  
 //}}AFX_MSG_MAP X<,sc;"b`k  
END_MESSAGE_MAP() OHp 121  
5W 5\  *L  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^0~?3t5  
: CDialog(CCaptureDlg::IDD, pParent) V8[woJ5x  
{ lJ R",_  
 //{{AFX_DATA_INIT(CCaptureDlg) CuT[V?^iD  
  m_bControl = FALSE; [AE]0cO@  
  m_bAlt = FALSE; L7q%u.nB1  
  m_bShift = FALSE;  6>Lr  
  m_Path = _T("c:\\"); c}g^wLa  
  m_Number = _T("0 picture captured."); q,0o:nI  
  nCount=0; ^[\F uSL  
  bRegistered=FALSE; -;Cl0O%  
  bTray=FALSE; 4q~+K' Z  
 //}}AFX_DATA_INIT Ks8S^77  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #x':qBv#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oKA8)~Xqou  
} WH/r$.&  
]/bf#&@g`k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5c3 )p^ ]g  
{ C1r]kF  
 CDialog::DoDataExchange(pDX); k2 k/v[60  
 //{{AFX_DATA_MAP(CCaptureDlg) *oZBv4Vh   
  DDX_Control(pDX, IDC_KEY, m_Key); _d %H;<_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); lwQI 9U[O2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5a5 I+* c  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2+sNt6B2  
  DDX_Text(pDX, IDC_PATH, m_Path); #RlI([f|&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); H.|FEV@  
 //}}AFX_DATA_MAP H5^ 'J`0\  
} ^|>vK,q$I  
3~a!h3.f  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J@p[v3W  
//{{AFX_MSG_MAP(CCaptureDlg) |DwI%%0(F  
 ON_WM_SYSCOMMAND() oBifESJ  
 ON_WM_PAINT() NU I|4X  
 ON_WM_QUERYDRAGICON() k3}ymhUf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JV(|7Sk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ol{)U;, `  
 ON_BN_CLICKED(ID_CHANGE, OnChange) F2!_Z=  
//}}AFX_MSG_MAP yZUB8erb.  
END_MESSAGE_MAP() ) i.p[  
&AZr (>  
BOOL CCaptureDlg::OnInitDialog() My,ki:V?g6  
{ (NScG[$}  
 CDialog::OnInitDialog(); 7MOjZD4?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?`,Xb.NA$K  
 ASSERT(IDM_ABOUTBOX < 0xF000); #N[nvIi}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ZK{VQ~  
 if (pSysMenu != NULL) ;W'y^jp]"  
 { o*'J8El\y^  
  CString strAboutMenu; l?pZdAE  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,DXNq`24  
  if (!strAboutMenu.IsEmpty()) &>*f J  
  { wu/]M~XwI  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2}b1PMpZG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >m44U 9   
  } [@uL)*o_#  
 } _\"7  
 SetIcon(m_hIcon, TRUE); // Set big icon D(@#Gd\Z@  
 SetIcon(m_hIcon, FALSE); // Set small icon %fJ*Ql4M  
 m_Key.SetCurSel(0); .Rd@,3  
 RegisterHotkey(); Beiz*2-}a  
 CMenu* pMenu=GetSystemMenu(FALSE); xzz[!yJjG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {S'xZ._=  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >|XQfavE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @&83/U?  
 return TRUE; // return TRUE unless you set the focus to a control Gv?'R0s  
} "  F~uTo  
=5[}&W  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #'v7mEwt  
{ q,PB; TT  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) w2@ `0  
 { ~{=+dQ  
  CAboutDlg dlgAbout; FxTOc@<  
  dlgAbout.DoModal(); 0 #VH=pga  
 } YB*ZYpRVl  
 else n;xtUw6 \  
 { $s)G0/~W  
  CDialog::OnSysCommand(nID, lParam); CLdLO u"  
 } 2%rAf8=  
} iNT1lk  
IT'~.!o7/  
void CCaptureDlg::OnPaint() bJx{mq  
{ Nye Ga  
 if (IsIconic()) %h4pIA  
 { _^0yE_ili  
  CPaintDC dc(this); // device context for painting 5owUQg,W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q/1 6D  
  // Center icon in client rectangle M$FQoRwH  
  int cxIcon = GetSystemMetrics(SM_CXICON); OzA"i y  
  int cyIcon = GetSystemMetrics(SM_CYICON); U~s&}M\n  
  CRect rect; V`l.F"<L  
  GetClientRect(&rect); v,KH2 (N  
  int x = (rect.Width() - cxIcon + 1) / 2; M9 fAv  
  int y = (rect.Height() - cyIcon + 1) / 2; rPv+eM" >  
  // Draw the icon qCc'w8A  
  dc.DrawIcon(x, y, m_hIcon); 4IG'T m  
 } /H:'(W_b;  
 else ,}=x8Xxr  
 { @Vr?)_ 0  
  CDialog::OnPaint(); Hh(_sewo  
 } /IxMRi=  
} 71z$a  
"e&S*8QhM  
HCURSOR CCaptureDlg::OnQueryDragIcon() k =ru) _$2  
{ z%}^9  
 return (HCURSOR) m_hIcon; (fUXJ$  
} cZe,l1$  
j\P47q'v#  
void CCaptureDlg::OnCancel() w3:Y]F.ot  
{ _WVeb}  
 if(bTray) Ja4O*C<  
  DeleteIcon(); THi*'D/  
  CDialog::OnCancel(); Y`uL4)hR5  
} A%Pjg1(uX  
vnw83a%3  
void CCaptureDlg::OnAbout() `$JPF  Z  
{ ((SN We  
 CAboutDlg dlg; 1Yo9Wf;vP  
 dlg.DoModal(); &y;('w  
} Zoh2m`6  
Be68 Fu0  
void CCaptureDlg::OnBrowse() RnE=T/VZJ  
{ xx)egy_  
 CString str; +`r;3kH ..  
 BROWSEINFO bi; g7EJyA  
 char name[MAX_PATH]; Egi<m   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ssoIC  
 bi.hwndOwner=GetSafeHwnd(); ]uI#4t~  
 bi.pszDisplayName=name; W~$YKBW  
 bi.lpszTitle="Select folder"; V)mRG`L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (%rO'X  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qSlC@@.>  
 if(idl==NULL) [>A%%  
  return; 6#MIt:#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !_QE|tVeR  
 str.ReleaseBuffer(); .RxH-]xk  
 m_Path=str; V2W)%c'  
 if(str.GetAt(str.GetLength()-1)!='\\') I0h/x5  
  m_Path+="\\"; XkHO=  
 UpdateData(FALSE); oP$NTy[  
} X2 c<.  
9fp1*d  
void CCaptureDlg::SaveBmp() _8vq]|rC  
{ Du k v[/60  
 CDC dc; $z"3_4a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vrXUS9i.  
 CBitmap bm; %G1kkcdH<  
 int Width=GetSystemMetrics(SM_CXSCREEN); B<SuNbR  
 int Height=GetSystemMetrics(SM_CYSCREEN); )[|`-M~u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Smzy EMT  
 CDC tdc; ne4j_!V{Mf  
 tdc.CreateCompatibleDC(&dc); 8%S5Fc #am  
 CBitmap*pOld=tdc.SelectObject(&bm); tY-{uHW&h  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &> tmzlww  
 tdc.SelectObject(pOld); 8  ;y N  
 BITMAP btm; +Em+W#i%?  
 bm.GetBitmap(&btm); vn}:$|r$J  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; l`G .lM(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7E*d>:5I  
 BITMAPINFOHEADER bih; ujGvrY j  
 bih.biBitCount=btm.bmBitsPixel; 81u}J9z;  
 bih.biClrImportant=0; p^_2]%,QeM  
 bih.biClrUsed=0; hg_@Ui@[z  
 bih.biCompression=0; 9!6sf GZ  
 bih.biHeight=btm.bmHeight; ;i\m:8!;  
 bih.biPlanes=1; )R.y>Ucb0  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^  ry   
 bih.biSizeImage=size;  w~wpm7  
 bih.biWidth=btm.bmWidth; n@<+D`[.V  
 bih.biXPelsPerMeter=0; FO#`}? R`  
 bih.biYPelsPerMeter=0; V`sINX  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); uO8z.  
 static int filecount=0; DUUQz:?{J  
 CString name; >0z(+}]3z  
 name.Format("pict%04d.bmp",filecount++); e~w-v"'  
 name=m_Path+name; ^vPM\qP#g  
 BITMAPFILEHEADER bfh; |B yw]\3v  
 bfh.bfReserved1=bfh.bfReserved2=0; RwJ#G7S#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dr#g[}l'H  
 bfh.bfSize=54+size; ?s/]k#H  
 bfh.bfOffBits=54; ~UA:_7#\M  
 CFile bf; +L D\~dcV+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M}2a/}4   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); gM~ dPM|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bBA #o\[  
  bf.WriteHuge(lpData,size); FGY4u4y  
  bf.Close(); = s^KZV  
  nCount++; =oz$uD}?  
 } tfW*(oU  
 GlobalFreePtr(lpData); c `C /U7j  
 if(nCount==1) j#mo Vq  
  m_Number.Format("%d picture captured.",nCount); 7<;87t]]  
 else <RH2G   
  m_Number.Format("%d pictures captured.",nCount); / qp)n">  
  UpdateData(FALSE); nA$zp  
} 1 ;Bgtv$  
w9h`8pt  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) C\#E1\d  
{ s|L}wtc  
 if(pMsg -> message == WM_KEYDOWN) _P9T h#UAg  
 {  ,U':=8  
  if(pMsg -> wParam == VK_ESCAPE) '}3@D$YiM%  
   return TRUE; 's#"~<L^e  
  if(pMsg -> wParam == VK_RETURN) =g)|g+[H  
   return TRUE; y qDE|DIez  
 } &!7{2E\7C  
 return CDialog::PreTranslateMessage(pMsg); Plpt7Pa_  
} >Wvb!8N  
fy&vo~4i;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O%feBe  
{ LA?h+)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sswYwU  
  SaveBmp(); Bs7/<$9K/  
  return FALSE; $}kT )+K  
} Z#w@ /!"}T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :Z rE/3_S  
 CMenu pop; 8~Avg6,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hI249gW9  
 CMenu*pMenu=pop.GetSubMenu(0); ^W}(]jL  
 pMenu->SetDefaultItem(ID_EXITICON); #J&45  
 CPoint pt; \H <k  
 GetCursorPos(&pt); Y v22,|:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2rK%fV53b  
 if(id==ID_EXITICON) 6%'bo`S#  
  DeleteIcon(); |oCE7'BaP  
 else if(id==ID_EXIT) -UD^O*U  
  OnCancel(); }?^V9K-  
 return FALSE; ]7W !  
} W6cA@DN$#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); aLzRbRv  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8&T6  
 AddIcon(); 24;F~y8H  
 return res; ]!l]^/ .  
} Y*oT (  
6, =oTmFP  
void CCaptureDlg::AddIcon() NJ" d`  
{ R Ptc \4  
 NOTIFYICONDATA data; zg)-RCG  
 data.cbSize=sizeof(NOTIFYICONDATA); 7ip$#pzo  
 CString tip; Qy!*U%tG'  
 tip.LoadString(IDS_ICONTIP); ^B)iBf Z  
 data.hIcon=GetIcon(0); .8[Uk^q  
 data.hWnd=GetSafeHwnd(); ibe#Y  
 strcpy(data.szTip,tip); @&H Tt  
 data.uCallbackMessage=IDM_SHELL; liu%K9-r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !=sM `(=~  
 data.uID=98; 6KT]3*B   
 Shell_NotifyIcon(NIM_ADD,&data); }@VdtH  
 ShowWindow(SW_HIDE); ue?e}hF  
 bTray=TRUE; ]r 6S|;:  
} R`%C]uG  
DK-V3}`q}  
void CCaptureDlg::DeleteIcon() e}V3dC^pU  
{ b=Rw=K.  
 NOTIFYICONDATA data; ?"23XKe  
 data.cbSize=sizeof(NOTIFYICONDATA); ~o"VZp  
 data.hWnd=GetSafeHwnd(); II=(>G9v  
 data.uID=98; >\J({/ #O  
 Shell_NotifyIcon(NIM_DELETE,&data); O+ ].'  
 ShowWindow(SW_SHOW); Pr|:nJs  
 SetForegroundWindow(); oaxCcB=\  
 ShowWindow(SW_SHOWNORMAL); k{M4.a[(  
 bTray=FALSE; 53vnON#{*  
} 6;|6@j  
R 1CoS6  
void CCaptureDlg::OnChange() L?[NXLn+  
{ f9R~RRz  
 RegisterHotkey(); ZjCT * qx  
} 3}U {~l!K  
}a=<Gl|I;w  
BOOL CCaptureDlg::RegisterHotkey() #2&DDy)B f  
{ 2@&|/O6_\h  
 UpdateData(); RXo!K iQO  
 UCHAR mask=0; a?635*9K  
 UCHAR key=0; fV}:eEo|Y  
 if(m_bControl) 1Z. D3@  
  mask|=4; 4$HU=]b6Tf  
 if(m_bAlt) ~3 ,>TV  
  mask|=2; .TI =3*`G  
 if(m_bShift) ):LgZ4h  
  mask|=1; P~"e=NL5  
  key=Key_Table[m_Key.GetCurSel()]; &nJH23h ^  
 if(bRegistered){ B;k3YOg  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <o JM||ZA  
  bRegistered=FALSE; 6R.%I{x'  
 } l+%2kR  
 cMask=mask; :[hZn/  
 cKey=key; e7T}*Up  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +`y{r^xD  
 return bRegistered; ihv=y\Jt  
} `,-w+3?Al  
xK7xAO  
  四、小结 H NFG:t9  
6bv~E.  
  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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