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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: cE`6uq7 p  
  P&j (,7  
  一、实现方法 psnTFe  
YY&l?*M<  
  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: 6(]tYcC  
aO@ 7O*  
#pragma data_seg("shareddata") qOSg!aft{Q  
HHOOK hHook =NULL; //钩子句柄 Ma'_e=+A  
UINT nHookCount =0; //挂接的程序数目 V[}4L| ad  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \A#1y\ok  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {%VV\qaC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey B3H|+  
static int KeyCount =0; ;<$H)`*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !).}u,*'no  
#pragma data_seg() <V7>?U l  
Xg=x7\V  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 "p/j; 6H  
lz?;#U  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: jn%!AH  
tG8jFou  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q\GDrdA  
cKey,UCHAR cMask) K,6b3kk  
{ N0K){  
 BOOL bAdded=FALSE; uQ=^~K:Z~  
 for(int index=0;index<MAX_KEY;index++){ )J_\tv  
  if(hCallWnd[index]==0){ 26dUA~|KJ  
   hCallWnd[index]=hWnd; ]J* ,g,  
   HotKey[index]=cKey; \S*$UE]uG  
   HotKeyMask[index]=cMask; cFN'bftH4  
   bAdded=TRUE; |\dZ'   
   KeyCount++; kaxvP v1  
   break; !IC-)C,q  
  } bae\Zk%`^  
 } }<>~sy  
 return bAdded; 1VF    
} "+z?x~rk  
//删除热键 K]qM~v<A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yf?h#G%24  
{ -*~CV:2iq-  
 BOOL bRemoved=FALSE; N7b1.]<  
 for(int index=0;index<MAX_KEY;index++){ :d0Y%vl  
  if(hCallWnd[index]==hWnd){ /wxE1][.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DbZ0e5  
    hCallWnd[index]=NULL; SFb{o <0 =  
    HotKey[index]=0; ]l@ qra  
    HotKeyMask[index]=0; ui "3ak+F  
    bRemoved=TRUE; X*g(q0N<S  
    KeyCount--; TDg@Tg0  
    break; [L6w1b,  
   }  Og2vGzD  
  } F$Ca;cP"  
 } 3;7q`  
 return bRemoved; 4D$;KokZ  
} f`8OM}un&  
hKNY+S})g  
T# lP!c  
  DLL中的钩子函数如下: 'q>2t}KG  
&3v&i*DG,I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (f_g7B2&y  
{ MlJVeod  
 BOOL bProcessed=FALSE; T *I?9d{k  
 if(HC_ACTION==nCode) O lfn  
 { KtB!"yy#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 x1gx$P  
   switch(wParam) U{~SXk'2+  
   {  Z,c,G2D  
    case VK_MENU: 3L _I[T$s  
     MaskBits&=~ALTBIT; LF?P> 1%-  
     break; :%JC^dV(  
    case VK_CONTROL: sM\lO  
     MaskBits&=~CTRLBIT; 85|fyX  
     break; j2M+]Zp.  
    case VK_SHIFT: zTo8OPr  
     MaskBits&=~SHIFTBIT; ~~F2Ij  
     break; sT1&e5`W  
    default: //judge the key and send message 7OVbP%n)d2  
     break; PzZZ>7_6S  
   } `C_'|d<HA  
   for(int index=0;index<MAX_KEY;index++){ 6<Hu8$G|  
    if(hCallWnd[index]==NULL) *zVvQ=  
     continue; u-DK_^v4M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rt(J/%;  
    { J?n<ydZSH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Zt@Z=r:&  
     bProcessed=TRUE; Gzt=u"FV  
    } f+Dn9t  
   } w7-WUvxl  
  } =y%rG :!  
  else if((lParam&0xc000ffff)==1){ //有键按下 ] c}91  
   switch(wParam) !asqr1/  
   { 5IqQ|/m<6  
    case VK_MENU: fT Y/4(  
     MaskBits|=ALTBIT; wk\L*\@Y}  
     break; % do1i W  
    case VK_CONTROL: kGN||h  
     MaskBits|=CTRLBIT; pKJK9@Ad  
     break; LD(C\  
    case VK_SHIFT: DFe;4BdC  
     MaskBits|=SHIFTBIT; TSL9ax4j  
     break; Psa@@'w  
    default: //judge the key and send message znZ7*S >6\  
     break; Di=9mHC  
   } beZ(o?uK  
   for(int index=0;index<MAX_KEY;index++){ dl l%4Sd  
    if(hCallWnd[index]==NULL) noNm^hFL  
     continue; q]<xMg#nu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UP2.]B!d  
    { */OI *{Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :WXf.+IA  
     bProcessed=TRUE; :#="%  
    } )u@c3?$6  
   } MonS hIz  
  } I__4I{nI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ])y{BlZ  
   for(int index=0;index<MAX_KEY;index++){ zW4 O4b$T  
    if(hCallWnd[index]==NULL) R[A5JQ$[  
     continue; [cU,!={  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;?IT)sNY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `Y3(~~YGn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 gs`^~iD]m  
   } ~%y\@x7I  
  } Ff"gadRXd  
 } i (HByI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FWPW/oC  
} IlLn4Iw  
K5ZnS`c;  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: K%{ad1$c  
"S(X[Y'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q!CO0w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ly (P=M>"y  
w;yx<1f  
  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: R Td^ImV  
IG.f=+<0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6 ,N6jaW  
{ M%=P)cC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]TK=>;&  
 { 3n(*E_n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 t]m!ee8*X<  
  SaveBmp(); pZ+j[!  
  return FALSE; T$b\Q  
 } Q5E:|)G  
 …… //其它处理及默认处理 <jd/t19DB  
} hWGZd~L  
Uh6mGL z*&  
{y);vHf$  
  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。 w@N{ @tG  
fwmLJ5o N  
  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。 b%0BkS*  
(zah890//  
  二、编程步骤 Uu2N9.5  
r7X D&Y  
  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"; 3sC: jIp  
kfpm=dKL  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; %yw=[]Vjze  
8[\ 79|  
  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; c2b6B.4  
mrnxI#6  
  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; +Hy4s[_|  
ATO 5  
  5、 添加代码,编译运行程序。 nGZ \<-  
Z>{*ISvpq  
三、程序代码 x*mc -&N  
)y\BY8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ib50LCm  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3}M \c)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0_V*B[V  
#if _MSC_VER > 1000 75(W(V(q  
#pragma once i wz` x  
#endif // _MSC_VER > 1000  M]0^ind  
#ifndef __AFXWIN_H__ }=pOiILvD  
#error include 'stdafx.h' before including this file for PCH QV)}3pW  
#endif Gm@iV,F%R  
#include "resource.h" // main symbols FuMq|S  
class CHookApp : public CWinApp r } 7:#XQ  
{ Hs<n^fyf  
 public: e 2*F;.)  
  CHookApp(); LV=^jsQ5  
  // Overrides ^?Vq L\V5  
  // ClassWizard generated virtual function overrides DB Xm  
  //{{AFX_VIRTUAL(CHookApp) lQr6;D}+  
 public: -RCv7U`  
  virtual BOOL InitInstance(); XZBj=2~-3  
  virtual int ExitInstance(); j&llrN  
  //}}AFX_VIRTUAL AFtCqq#[  
  //{{AFX_MSG(CHookApp) vcOsq#UW  
  // NOTE - the ClassWizard will add and remove member functions here. B}k'@;G  
  // DO NOT EDIT what you see in these blocks of generated code ! '^lUL) R  
  //}}AFX_MSG `wV|q~  
  DECLARE_MESSAGE_MAP() +QupM  
}; ^^Bm$9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Uf[T_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )6C`&Mj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $:]tcY-L9  
BOOL InitHotkey(); [,\i[[<  
BOOL UnInit(); ?7rD42\8H  
#endif D3]@i&^B  
5^o3y.J?P  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .r6YrB@['  
#include "stdafx.h" p9w%kM?  
#include "hook.h" _}z_yu#jY  
#include <windowsx.h> ox JGJ  
#ifdef _DEBUG I W8.  
#define new DEBUG_NEW g?$e^ls  
#undef THIS_FILE MyM+C}  
static char THIS_FILE[] = __FILE__; 7n<#y;wo  
#endif +QQ YPEx+  
#define MAX_KEY 100 1[[TB .xF  
#define CTRLBIT 0x04 x{QBMe`  
#define ALTBIT 0x02 IE@ z@+\(  
#define SHIFTBIT 0x01 X#Ak'%J  
#pragma data_seg("shareddata") ~ \-r  
HHOOK hHook =NULL; '@S,V/jy0z  
UINT nHookCount =0; HD~jU>}}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J,`_,T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tbRE/L<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SDJ;*s-  
static int KeyCount =0; Y"s )u7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8t--#sDy{0  
#pragma data_seg() s.bT[0Vl  
HINSTANCE hins; @qpYDnJ:  
void VerifyWindow(); M@5KoMsB9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +0dQORo  
//{{AFX_MSG_MAP(CHookApp) GW:\l~ d  
// NOTE - the ClassWizard will add and remove mapping macros here. 8_+vb#M  
// DO NOT EDIT what you see in these blocks of generated code! @>gD1Q7v b  
//}}AFX_MSG_MAP #Ul4&QVeg  
END_MESSAGE_MAP() *+NZQjl'  
ZtKQ]jV&@  
CHookApp::CHookApp() dqL  -'  
{ B>ge, }{  
 // TODO: add construction code here, '[n)N@h  
 // Place all significant initialization in InitInstance EK:Y2WZ  
} p5D5%B/  
$]Rl__;  
CHookApp theApp; oMz/sL'u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5_PWGaQa  
{ nP5d?  
 BOOL bProcessed=FALSE; //6^+-he  
 if(HC_ACTION==nCode) zL6 \p)y  
 { y`\mQ48V  
  if((lParam&0xc0000000)==0xc0000000){// Key up Gmqs`{tc  
   switch(wParam) kf}F}Ad:%  
   { A> J1B(up  
    case VK_MENU: Ny]'RS-  
     MaskBits&=~ALTBIT; .Kg|f~InO  
     break; kT>r<`rt  
    case VK_CONTROL: L,yA<yrC  
     MaskBits&=~CTRLBIT; 'E@2I9Kj  
     break; @*bvMEE  
    case VK_SHIFT: #: dR^zr<  
     MaskBits&=~SHIFTBIT; D9e+  
     break; Zj:a-=  
    default: //judge the key and send message YG-Z.{d5Z  
     break; 9"[!EKW  
   } =I+l=;05Rd  
   for(int index=0;index<MAX_KEY;index++){ Bm65 W  
    if(hCallWnd[index]==NULL) 9k(*?!\;  
     continue; rSM$E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DxE^#=7iH;  
    { 2Px$0&VN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l6',  
     bProcessed=TRUE; gcQ.  YP9  
    } $'WapxF  
   } Mp]yKl  
  } 4jDs0Hn"  
  else if((lParam&0xc000ffff)==1){ //Key down .vCY%0oE  
   switch(wParam) =# k<Kw#  
   { deR$  
    case VK_MENU: bbfDt^  
     MaskBits|=ALTBIT; N |OMj%Uk  
     break; CpUI|Rs  
    case VK_CONTROL: g5lmUKlQ$0  
     MaskBits|=CTRLBIT; % JgRcx  
     break; bE VO<x+  
    case VK_SHIFT: '*o7_Ez-{  
     MaskBits|=SHIFTBIT; bd@*vu}?}  
     break; %s~NQ;Y  
    default: //judge the key and send message n25irCD`  
     break; ORV}j, Ym  
   } V%X:1 8j  
   for(int index=0;index<MAX_KEY;index++) Vy?R/ Uu  
   { ccHLL6F{  
    if(hCallWnd[index]==NULL) \O8Y3|<  
     continue; m1~qaD<DZ$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fW_}!`:  
    { 2LhfXBWf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); pDLu+ }@  
     bProcessed=TRUE; c n\k`8  
    } gaLEhf^  
   } cq'}2pob  
  } XgwMppacw  
  if(!bProcessed){ 6Tm Rc  
   for(int index=0;index<MAX_KEY;index++){ \;3B?8wbIl  
    if(hCallWnd[index]==NULL) z5|e\Z  
     continue; hLDch5J5~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c+,7Zu!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CT$& zEIm  
   } wGov|[X  
  } dv1x 78xG>  
 } ?.rH;:9To  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,7n;|1`  
} }}4 sh5z  
4yJ*85e]  
BOOL InitHotkey() @%I_&!d  
{ >?\v@   
 if(hHook!=NULL){ zIAu3  
  nHookCount++; EI?d(K  
  return TRUE; RTgQ#<W8  
 } = )JVT$]w  
 else yr/]xc$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Rye ~w6  
  if(hHook!=NULL) O<eWq]  
   nHookCount++; I =tyQ`  
  return (hHook!=NULL); 4 ~MJ4:  
} [*Aqy76Qa  
BOOL UnInit() Yj^avO=;  
{ m>Yo 9/XpZ  
 if(nHookCount>1){ 7d M6;`V^  
  nHookCount--; 1_33;gP  
  return TRUE; #Lhj0M;a  
 } i-:8TfI,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ? $)x$nS`  
 if(unhooked==TRUE){ rm5T=fNJ  
  nHookCount=0; T!^?d5uW#  
  hHook=NULL; Vid{6?7kh  
 } tdw\Di#m  
 return unhooked; E1U4v&P  
} A}t&-  
-H ac^4uF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U- *8%>Qp  
{ =ELDJt  
 BOOL bAdded=FALSE; *MnG-\{j  
 for(int index=0;index<MAX_KEY;index++){ D^N#E>,  
  if(hCallWnd[index]==0){  &*>C PO  
   hCallWnd[index]=hWnd; s{1Deek=  
   HotKey[index]=cKey; `PQ?8z|  
   HotKeyMask[index]=cMask; niBjq#bJi  
   bAdded=TRUE; 5 CY_Ay\  
   KeyCount++; )$l9xx[  
   break; OW63^wA`s  
  } pjKl)q  
 } [6&CloY3  
 return bAdded; OUIUgej  
} m! '1$G  
{LB }v;?l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9J2q`/6~e  
{ Z3abem<Q  
 BOOL bRemoved=FALSE; Tjeo*n^  
 for(int index=0;index<MAX_KEY;index++){ R[>;_}5">  
  if(hCallWnd[index]==hWnd){ gvTOC F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :EQme0OW  
    hCallWnd[index]=NULL; aCYm$6LmA  
    HotKey[index]=0; |=^#d\?]j  
    HotKeyMask[index]=0; 9pl_V WrQ  
    bRemoved=TRUE; evg 7d  
    KeyCount--; }!Diai*C  
    break; }n2-*{)x  
   } ;}>g1&q  
  } jL7MmR#y5"  
 } ;Xd\$)n  
 return bRemoved; zI2KIXcc  
} z:i X]df  
@aiLG wh  
void VerifyWindow() }x#P<d(  
{ !OZh fMVd  
 for(int i=0;i<MAX_KEY;i++){ !6tC[W`  
  if(hCallWnd!=NULL){ n6!Ihip$  
   if(!IsWindow(hCallWnd)){ FbCZV3Y  
    hCallWnd=NULL; O[hbu![  
    HotKey=0; X%9xuc  
    HotKeyMask=0; #Z=)=  
    KeyCount--; L(1,W<kYg  
   } ?_Dnfa_  
  } t0V_ c'm  
 } iQ]c k-  
} )[M<72  
da?th  
BOOL CHookApp::InitInstance() :5cu,&<Gv  
{ M(h H#_ $  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); J2 rLsNC]0  
 hins=AfxGetInstanceHandle(); =<'iLQb1  
 InitHotkey(); 0rm;)[SjF  
 return CWinApp::InitInstance(); b gc<)=  
} ;~@PYIp  
rIFC#Jd/  
int CHookApp::ExitInstance() }AsF\W+5  
{ :D+ SY  
 VerifyWindow(); iUG/   
 UnInit(); nog\,NT  
 return CWinApp::ExitInstance(); i{FC1tVeL_  
} 9hs{uxwuEE  
zs&`:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ae_ E;[mj  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ep}/dBg  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bq6{ty"  
#if _MSC_VER > 1000 4 TQISu)  
#pragma once 4tTZkJc  
#endif // _MSC_VER > 1000 q'V{vFfY%  
ot+~|Dl  
class CCaptureDlg : public CDialog *1)NABp6D  
{ wCTR-pL^  
 // Construction iBiA0 W  
 public: 5B.??;xtaV  
  BOOL bTray; W7[ S7kd  
  BOOL bRegistered; $9_.Q/9>  
  BOOL RegisterHotkey(); $}UJs <-F  
  UCHAR cKey; ihBl",l&Hq  
  UCHAR cMask; <:{[Zvl'k  
  void DeleteIcon(); ?a0}^:6  
  void AddIcon(); q\HBAr y  
  UINT nCount; 8}#Lo9:,d  
  void SaveBmp(); ylxfh(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }.$ B1%2  
  // Dialog Data Lr\ B  
  //{{AFX_DATA(CCaptureDlg) E)_!Hi0<s  
  enum { IDD = IDD_CAPTURE_DIALOG }; =+-.5M  
  CComboBox m_Key; KZ}4<{3  
  BOOL m_bControl; >)A  
  BOOL m_bAlt; !6/IKh`J  
  BOOL m_bShift; %^%-h}1  
  CString m_Path; g+/U^JIc4l  
  CString m_Number; 3N%Ev o  
  //}}AFX_DATA UuqnL{  
  // ClassWizard generated virtual function overrides 8kc'|F\  
  //{{AFX_VIRTUAL(CCaptureDlg) z57papo  
 public: v8k ^=A:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *4^]?Y\*  
 protected: [<fLPa  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8'xnhV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Z%9^6kdY  
  //}}AFX_VIRTUAL dVt@D&  
  // Implementation =XBXSW8)DJ  
 protected: x-#9i  
  HICON m_hIcon; ftqW3VW  
  // Generated message map functions R:R@sU  
  //{{AFX_MSG(CCaptureDlg) -*q2Y^A^l  
  virtual BOOL OnInitDialog(); bfI -!,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u R%R]X  
  afx_msg void OnPaint(); Jo(}#_y?  
  afx_msg HCURSOR OnQueryDragIcon(); l(#Y8  
  virtual void OnCancel(); %y\7  
  afx_msg void OnAbout(); nJ#@W b@  
  afx_msg void OnBrowse(); E0Y/N?  
  afx_msg void OnChange(); h_G7T1;L  
 //}}AFX_MSG (dip Ks?K  
 DECLARE_MESSAGE_MAP() ,h`D(,?X  
}; t RyGxqiG  
#endif 6Vzc:8o>  
2,Dc]oj  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file . _t,OX$  
#include "stdafx.h" +sluu!~  
#include "Capture.h" RR[TW;  
#include "CaptureDlg.h" bNU^tL3QZ  
#include <windowsx.h> *B<I><'G  
#pragma comment(lib,"hook.lib") KJC9^BAr  
#ifdef _DEBUG *3 8Y;{ 4  
#define new DEBUG_NEW |#jm=rT0y  
#undef THIS_FILE Aq]'.J =4  
static char THIS_FILE[] = __FILE__; #*M$,ig  
#endif RS02>$jo  
#define IDM_SHELL WM_USER+1 vEp8Hc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N,,2 VSUr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <_q/ +x]8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;f^jB;\<  
class CAboutDlg : public CDialog =<h=">}5'  
{ Xgc\O08  
 public: mT~>4xi0  
  CAboutDlg(); 5nq-b@?L  
  // Dialog Data LHz<=]?@  
  //{{AFX_DATA(CAboutDlg) W}_}<rlF  
  enum { IDD = IDD_ABOUTBOX }; HU+H0S~g  
  //}}AFX_DATA _rJ SkZO  
  // ClassWizard generated virtual function overrides Z_~DTO2Qg  
  //{{AFX_VIRTUAL(CAboutDlg) FEmlC,%  
 protected: gj;G:;1m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uWj-tzu  
  //}}AFX_VIRTUAL 76r s)J[*w  
  // Implementation F_ Cz  
 protected: _-\{kJ  
  //{{AFX_MSG(CAboutDlg) &LQab>{*K  
  //}}AFX_MSG TC#B^m`'p  
  DECLARE_MESSAGE_MAP() 2U+p@}cQUA  
}; Ol[IC  
<!(n5y_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) CHw_?#h  
{ O~ 0 1)%  
 //{{AFX_DATA_INIT(CAboutDlg) #p`7gFl  
 //}}AFX_DATA_INIT d$~b`  
} GZX!iT  
~(]DNXB8I`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,ToEK Id  
{ qM !q,Q  
 CDialog::DoDataExchange(pDX); U7eQ-r  
 //{{AFX_DATA_MAP(CAboutDlg) G.e\#_RR?  
 //}}AFX_DATA_MAP .Awq(  
} !I/kz }N@  
R0d|j#vP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oXkhj,{y5  
 //{{AFX_MSG_MAP(CAboutDlg) /n7,B}  
 // No message handlers E8<i PTJs  
 //}}AFX_MSG_MAP P`9A?aG.Z  
END_MESSAGE_MAP() o9\m? ~g!E  
/k"P4\P`+Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !|c5@0Wr  
: CDialog(CCaptureDlg::IDD, pParent) Hv*O9!cC  
{ (Fd4Gw<sq  
 //{{AFX_DATA_INIT(CCaptureDlg) 0^Cx`xdX:  
  m_bControl = FALSE; Z+4Oa f!  
  m_bAlt = FALSE; R\amcQ 9  
  m_bShift = FALSE; Lpf=VyqC  
  m_Path = _T("c:\\"); ?EAqv]  
  m_Number = _T("0 picture captured."); 7Z3qaXPH  
  nCount=0; :|3 C-+[  
  bRegistered=FALSE; c?",kzo  
  bTray=FALSE; }TvAjLIS6  
 //}}AFX_DATA_INIT QLG,r^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hDMp^^$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =oDrN7`,B  
} K_3ZJ  
4]KceE  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H4Ek,m|c  
{ L1i> %5:g  
 CDialog::DoDataExchange(pDX); oP 0j>i,"&  
 //{{AFX_DATA_MAP(CCaptureDlg) )~(_[='  
  DDX_Control(pDX, IDC_KEY, m_Key); yqI|BF`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~A4WuA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); CNYchE,}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uu.Nq*3  
  DDX_Text(pDX, IDC_PATH, m_Path); e)"cm;BJ^P  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Lr:K0A.Ch  
 //}}AFX_DATA_MAP xII!2.  
} ]XyJ7esg  
So`"z[5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R&xd ic!  
//{{AFX_MSG_MAP(CCaptureDlg) V=~dgy ~@  
 ON_WM_SYSCOMMAND() rzLl M  
 ON_WM_PAINT() miSC'!  
 ON_WM_QUERYDRAGICON() 8:NHPHxB  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?,C,q5 T\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) cn:VEF:l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1j,Y  
//}}AFX_MSG_MAP p\\q[6  
END_MESSAGE_MAP() pE,BE%  
PX)qA =4q  
BOOL CCaptureDlg::OnInitDialog() _P1-d`b0 a  
{ j"s(?  
 CDialog::OnInitDialog(); 2Wtfx" .y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8 K!a:{  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~O$]y5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kw'D2692  
 if (pSysMenu != NULL) B,T.bgp\  
 { `^vD4qD|  
  CString strAboutMenu; :Ej)A fS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); EMbsKG  
  if (!strAboutMenu.IsEmpty()) C:{'0m*jKs  
  { K%Bi8d  
   pSysMenu->AppendMenu(MF_SEPARATOR); XZGyhX7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); BW 7[JD  
  } S:s^si2/  
 } pE N`&'4  
 SetIcon(m_hIcon, TRUE); // Set big icon H(s^le:!  
 SetIcon(m_hIcon, FALSE); // Set small icon o+&sodt|`  
 m_Key.SetCurSel(0); etVE8N'  
 RegisterHotkey(); e>.xXg6Zn  
 CMenu* pMenu=GetSystemMenu(FALSE); 5H5Kt9DoW  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]3'd/v@fT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); M(f'qFY=K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r%i{a  
 return TRUE; // return TRUE unless you set the focus to a control VuW19-G  
} ~Y[1Me  
QCw<* Id+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?dYDfyFfB  
{ ^*OA%wg3=h  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tEj5WEnNE8  
 { < n{9pZ5.  
  CAboutDlg dlgAbout; l ,.;dw  
  dlgAbout.DoModal(); =@>&kU%$&  
 } w?q"%F;/  
 else PYe>`X?  
 { f9$q.a*  
  CDialog::OnSysCommand(nID, lParam); IYPLitT  
 } w=$_',5#Z  
} VK#zmEiB  
qxx.f5 8H  
void CCaptureDlg::OnPaint() }f}&|Vap  
{ l-rnDl  
 if (IsIconic()) |IvX7%*]~  
 { F/Xhm91 ^  
  CPaintDC dc(this); // device context for painting &Is%I<'o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vI@8DWs  
  // Center icon in client rectangle >smaR^m  
  int cxIcon = GetSystemMetrics(SM_CXICON); I1,?qr"Zr  
  int cyIcon = GetSystemMetrics(SM_CYICON); 79DC]48M  
  CRect rect; rIb{=';  
  GetClientRect(&rect); :.,I4>b2  
  int x = (rect.Width() - cxIcon + 1) / 2; ghl9gFFj  
  int y = (rect.Height() - cyIcon + 1) / 2; +#no$m.bH  
  // Draw the icon 5`Bb0=j  
  dc.DrawIcon(x, y, m_hIcon); @[Th{HTc.G  
 } <PxEl4  
 else 4]GyuY  
 { KVCS(oN  
  CDialog::OnPaint(); "x11 YM{F  
 } N.?Wev{  
} ~nQb;Bdh%  
`*a,8M%  
HCURSOR CCaptureDlg::OnQueryDragIcon() i]v!o$7  
{ .uP$M(?j  
 return (HCURSOR) m_hIcon; o&zV8DE_v  
} jX%Q  
.+<K-'&=  
void CCaptureDlg::OnCancel() uRIr,U^  
{ ]+8,@%="  
 if(bTray) @ h]H_  
  DeleteIcon(); +j,;g#d  
  CDialog::OnCancel(); Syk^7l  
} nL? B  
Xqy{=:0  
void CCaptureDlg::OnAbout() -]e@cevy  
{ a/ZfPl0Ns[  
 CAboutDlg dlg; fCKcv |  
 dlg.DoModal(); Q%a4g  
} yWuq/J:  
s5.2gu|"%  
void CCaptureDlg::OnBrowse() v:chr$>j5  
{ \0$?r4A  
 CString str; -l",!sV  
 BROWSEINFO bi; H4N==o  
 char name[MAX_PATH]; = U5)m  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?2M15Q  
 bi.hwndOwner=GetSafeHwnd(); ?=,tcN  
 bi.pszDisplayName=name; V;!D:N8<  
 bi.lpszTitle="Select folder"; ^6`U0|5mRX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; l},%g%}iMU  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); p82qFzq#  
 if(idl==NULL) i=ba=-"Mt  
  return; ]O[f#lG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MI/1uw  
 str.ReleaseBuffer(); ]mp.KvB  
 m_Path=str; __QT lj  
 if(str.GetAt(str.GetLength()-1)!='\\') y!#1A?|k  
  m_Path+="\\"; eR/7*G5  
 UpdateData(FALSE); a4wh-35/  
} (n< xoV[e  
46vz=# ,6L  
void CCaptureDlg::SaveBmp() 0ode&dB  
{ C8?/$1|RL  
 CDC dc; 0V^?~ex  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #E#70vWp\O  
 CBitmap bm; -+L1Hid.7  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4&\m!s  
 int Height=GetSystemMetrics(SM_CYSCREEN); @*oi1_q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); TzOf&cs/r  
 CDC tdc; tFGLqR%/  
 tdc.CreateCompatibleDC(&dc); %63<Iz"  
 CBitmap*pOld=tdc.SelectObject(&bm); {E9Y)Z9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |89`O^   
 tdc.SelectObject(pOld); Zy'bX* s|  
 BITMAP btm; ~&pk</Dl  
 bm.GetBitmap(&btm); GcKJpI\sB  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; eaI&DP  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *}?^)z7w  
 BITMAPINFOHEADER bih; MV/JZ;55  
 bih.biBitCount=btm.bmBitsPixel; "0 v]O~s  
 bih.biClrImportant=0; u@o3p*bQ  
 bih.biClrUsed=0; ,Zdc  
 bih.biCompression=0; t~Uqsa>n@'  
 bih.biHeight=btm.bmHeight; 8Hhe&B  
 bih.biPlanes=1; h\1_$ac  
 bih.biSize=sizeof(BITMAPINFOHEADER); dLAElTg  
 bih.biSizeImage=size; x*YJ :t  
 bih.biWidth=btm.bmWidth; =$HzEzrw  
 bih.biXPelsPerMeter=0; W4N$]D=  
 bih.biYPelsPerMeter=0; 8]0^OSS  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rO-Tr  
 static int filecount=0; #hai3>9|B  
 CString name; Hi ?],5,/  
 name.Format("pict%04d.bmp",filecount++); E_h9y  
 name=m_Path+name; cD{[rI E3  
 BITMAPFILEHEADER bfh; r6^DD$X  
 bfh.bfReserved1=bfh.bfReserved2=0; 0c]Lm?&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `0sa94H1[  
 bfh.bfSize=54+size; IlwY5iL  
 bfh.bfOffBits=54; E_xpq  
 CFile bf; mFvw s  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `T-(g1:9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @A)gsDt9A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [p]Ayo$~  
  bf.WriteHuge(lpData,size); 7c+u+Yet  
  bf.Close(); w_9:gprf  
  nCount++; 5SDHZ?h  
 } j"c"sF\q  
 GlobalFreePtr(lpData); b2Ct^`|M5  
 if(nCount==1) 2lGq6Au:  
  m_Number.Format("%d picture captured.",nCount); }C)   
 else s|q B;  
  m_Number.Format("%d pictures captured.",nCount); N&=,)d~M  
  UpdateData(FALSE); #fa~^]EM]  
} gP<l  
Q tRKmry{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T IS}'c'C  
{ ?4xTA  
 if(pMsg -> message == WM_KEYDOWN) =6? 3c\  
 { H*l8,*M}  
  if(pMsg -> wParam == VK_ESCAPE) ~_R=2t{u _  
   return TRUE;  |,.glL  
  if(pMsg -> wParam == VK_RETURN) {4#'`Eejj  
   return TRUE; T9u/|OP  
 } `/#6k>  
 return CDialog::PreTranslateMessage(pMsg); E9 |i:  
} h8nJ$jg  
Yh4e\]ql~N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L!5%;!>.P  
{ vK|d P3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >V NMQ  
  SaveBmp(); xGz$M@f  
  return FALSE; #.) qQ8*(  
} /\2s%b*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3C.bzw^  
 CMenu pop; [ h%ci3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -[ F<u  
 CMenu*pMenu=pop.GetSubMenu(0); ji">} -  
 pMenu->SetDefaultItem(ID_EXITICON); h(>4%hF  
 CPoint pt; ^f>+5G  
 GetCursorPos(&pt); 514;!Q4K  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); p=eSHs{>A  
 if(id==ID_EXITICON) M,6m*  
  DeleteIcon(); (/c9v8Pr(7  
 else if(id==ID_EXIT) 3q<\ \8Y*  
  OnCancel(); aWW|.#L  
 return FALSE; ca-|G'q  
} 1J^{h5?lU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -p9|l%W  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RzNv|   
 AddIcon(); {V8 v  
 return res; ~GMlnA]6  
} !K_%@|:7%  
> `u} G1T\  
void CCaptureDlg::AddIcon() GYCc)Guc  
{ h@l5MH=|%  
 NOTIFYICONDATA data; ]Y:|%rvVH  
 data.cbSize=sizeof(NOTIFYICONDATA); /)6<`S(  
 CString tip; 3%'$AM}+s  
 tip.LoadString(IDS_ICONTIP); )j!22tlL  
 data.hIcon=GetIcon(0); NfKi,^O  
 data.hWnd=GetSafeHwnd(); r\a9<nZ{  
 strcpy(data.szTip,tip); +K]kGF  
 data.uCallbackMessage=IDM_SHELL; {R]4N]l>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f5^[`b3H  
 data.uID=98; 4mUQVzV  
 Shell_NotifyIcon(NIM_ADD,&data); YG<?|AS/  
 ShowWindow(SW_HIDE); l[.RnM[v  
 bTray=TRUE; 6wfCC,2  
} +.5 /4?  
|no '^  
void CCaptureDlg::DeleteIcon() *cJ GrLC  
{ HLa|yc B%  
 NOTIFYICONDATA data; ,M5J~Ga  
 data.cbSize=sizeof(NOTIFYICONDATA); 1+v)#Wj  
 data.hWnd=GetSafeHwnd(); ;L++H5Kz6  
 data.uID=98; Kp8!^os  
 Shell_NotifyIcon(NIM_DELETE,&data); ;E(%s=i  
 ShowWindow(SW_SHOW); vY:A7yGW  
 SetForegroundWindow(); h9RG?r1  
 ShowWindow(SW_SHOWNORMAL); vfm |?\  
 bTray=FALSE; pzHN:9r  
} a";(C ,:0  
ma vc$!y  
void CCaptureDlg::OnChange() 4Rp2  
{ [{- Oy#T<  
 RegisterHotkey(); }n oI2.-#  
} U C3?XoT\  
WTZP}p1  
BOOL CCaptureDlg::RegisterHotkey() j;)U5X  
{ %jim] ]<S[  
 UpdateData(); Fz~-m#Ts  
 UCHAR mask=0; R"VmN2  
 UCHAR key=0; _6(QbY'JV`  
 if(m_bControl) *EvnN:  
  mask|=4; +QqYf1@F  
 if(m_bAlt) ) j_g*<  
  mask|=2; A9!%H6  
 if(m_bShift) 7;+:J;xf66  
  mask|=1; a3sXl+$D@  
  key=Key_Table[m_Key.GetCurSel()]; a>G|t5w  
 if(bRegistered){ s -~Tf|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -!k"*P  
  bRegistered=FALSE; <9B\('  
 } hj4Kv  
 cMask=mask; u+~Ta  
 cKey=key; N{ @B@]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D<]z.33  
 return bRegistered; -P^ 6b(  
} nPD5/xW  
{YT!vD9.  
  四、小结 Yu>VW\Fb  
8S"vRR  
  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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