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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: J j yQ  
  XMa(XOnX  
  一、实现方法 A6q,"BS^d  
f.V0uBDN  
  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: qaG%PH}a  
P,_GTs3/G  
#pragma data_seg("shareddata") *)L%pH>`  
HHOOK hHook =NULL; //钩子句柄 D@>P%k$$s>  
UINT nHookCount =0; //挂接的程序数目 j%]i#iqF  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 s:jr/ j!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !i.`m-J*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |X~T</{8i  
static int KeyCount =0; V6BCW;   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 j 7a;g7.  
#pragma data_seg() N#Qby4w >  
, $78\B^  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _d A-{  
=WJ*$j(  
  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: az F"tke  
oopTo51,a  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Vy-H3BR  
cKey,UCHAR cMask) s@^GjA[6+  
{  J@(*(oQb  
 BOOL bAdded=FALSE; xfos>|0N  
 for(int index=0;index<MAX_KEY;index++){  5t:4%  
  if(hCallWnd[index]==0){ pc^(@eD  
   hCallWnd[index]=hWnd; Rj^bZ%t  
   HotKey[index]=cKey; 75Jh(hd(  
   HotKeyMask[index]=cMask; rM=Q.By+\  
   bAdded=TRUE; |+x;18  
   KeyCount++; H Tf7r-  
   break;  vRn^n  
  } 4LUFG  
 } pjIXZ=  
 return bAdded;  6.KR(V  
} \hv*`ukF  
//删除热键 #u|;YC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z;7f D  
{  W* `2lf  
 BOOL bRemoved=FALSE; `"A\8)6-  
 for(int index=0;index<MAX_KEY;index++){ ]Ny.  gu  
  if(hCallWnd[index]==hWnd){ x4.-7%VV%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nDui9C  
    hCallWnd[index]=NULL; /_ o1b_1 U  
    HotKey[index]=0; z=n"cE[KtB  
    HotKeyMask[index]=0; )-2OraUm<  
    bRemoved=TRUE; xI}]q%V  
    KeyCount--; n&FN?"I/]  
    break; &P[eA u  
   } AM'-(x|  
  } ]*[S# Jk  
 } 3$(1LN  
 return bRemoved; 'u_'y  
} fCO!M1t  
Ks8S^77  
b==<7[8  
  DLL中的钩子函数如下: oKA8)~Xqou  
o LuGW5wzj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *1Nz VV  
{ .OXvv _?<  
 BOOL bProcessed=FALSE; HWVWl~FA  
 if(HC_ACTION==nCode) ,t*#o&+  
 { ;gK+AU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 J --9VlC'  
   switch(wParam) c5R58#XK=  
   {  =WFMqBh<`  
    case VK_MENU: ,K3)f.ArYc  
     MaskBits&=~ALTBIT; G/N'8Q)  
     break; i7cMe8  
    case VK_CONTROL: RUYw D tC  
     MaskBits&=~CTRLBIT; .OX.z~":y  
     break; B~caHG1b  
    case VK_SHIFT: >[O @u4  
     MaskBits&=~SHIFTBIT; sW3-JA]  
     break; +\\,FO_  
    default: //judge the key and send message [=S@lURzm@  
     break; o-GlBXI;  
   } N/qr}- 3z  
   for(int index=0;index<MAX_KEY;index++){ !yG{`#NZZ  
    if(hCallWnd[index]==NULL) ?9 :{p  
     continue; `| L+a~~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r,L#JR w#-  
    { My,ki:V?g6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (NScG[$}  
     bProcessed=TRUE; z"=#<C  
    } C;G~_if4PR  
   } WnvuB.(@3  
  } efl6U/'Ij  
  else if((lParam&0xc000ffff)==1){ //有键按下 pWO,yxr:  
   switch(wParam) o*'J8El\y^  
   { M-T&K% /lW  
    case VK_MENU: Nyow:7p  
     MaskBits|=ALTBIT; cqRIi~`  
     break; &N[~+"  
    case VK_CONTROL: 2}b1PMpZG  
     MaskBits|=CTRLBIT; %RdCSQ9~  
     break; -9.S?N'T>;  
    case VK_SHIFT: tm#T8iF  
     MaskBits|=SHIFTBIT; NVcL9"ht*@  
     break; TL1pv l  
    default: //judge the key and send message lRZt))3  
     break; u"?cmg<.1  
   } $X WJxQRUv  
   for(int index=0;index<MAX_KEY;index++){ {S'xZ._=  
    if(hCallWnd[index]==NULL) >|XQfavE  
     continue; CmY'[rI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RUlM""@b  
    { Ip4CC'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hg]\~#&-  
     bProcessed=TRUE; N&-d8[~  
    } j42U|CuK  
   } ) e;)9~  
  } z,X ^;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^ :6v- Yx  
   for(int index=0;index<MAX_KEY;index++){ Yvs9)g  
    if(hCallWnd[index]==NULL) hz>&E,<8q  
     continue; _;G"{e.=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) & WYIfx{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vp[~%~1(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 UqsVqi h(  
   } z X2BJ  
  } O)Nj'Hcu  
 } zX{ [Z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6}K|eUak/  
} WG1Uv PK  
cCw?%qq,L  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: YaFQy0t%/5  
!FA^~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y4C_G?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =zK7`5  
Y9'Bdm/  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: !D7/Ja  
*h-_   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?Q]&d!U Cs  
{ zq8 z#FN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Q*^zphT  
 { A@?2qX^4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >(<OhS(  
  SaveBmp(); B&0-~o3WP  
  return FALSE; =L 7scv%i  
 } |GA4fFE=  
 …… //其它处理及默认处理 gX{V>T(<  
} A%"mySW  
38>8{Ma  
f]h99T  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 \XCs(lNh  
- 9UQs.Nv  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .o]vjNrd/  
*QG>U[  
  二、编程步骤 cW/RH.N  
71z$a  
  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"; zEl@jK,{$  
(=j]fnH?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !BIq>pO%Ui  
F7E #x  
  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;  =SRp  
Vv B%,_\  
  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; fM]zD/ g  
>dUnk)7  
  5、 添加代码,编译运行程序。 B;SYO>.W  
PxM]3Aoa  
三、程序代码 Gm}ecW  
LrX7WI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %A,4vLe~6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9mEC|(m*WK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |p4F^!9  
#if _MSC_VER > 1000 4hg#7#?boW  
#pragma once ]>b.oI/  
#endif // _MSC_VER > 1000 :K#'?tH  
#ifndef __AFXWIN_H__ 1,p7Sl^h  
#error include 'stdafx.h' before including this file for PCH |>gya&  
#endif ^+Ie   
#include "resource.h" // main symbols #VgPg5k.<  
class CHookApp : public CWinApp Dr^#e  
{ +#"CgZ]  
 public: [;7&E{,C  
  CHookApp(); $A`D p{e"  
  // Overrides Xjt/ G):L  
  // ClassWizard generated virtual function overrides =nh/w#  
  //{{AFX_VIRTUAL(CHookApp) Q0Y0Zt,h  
 public: wcspqC"_  
  virtual BOOL InitInstance(); c*'D  
  virtual int ExitInstance(); po}Jwx!  
  //}}AFX_VIRTUAL HpiP"Sl  
  //{{AFX_MSG(CHookApp) fLa 7d?4  
  // NOTE - the ClassWizard will add and remove member functions here. P 5yS`v$@  
  // DO NOT EDIT what you see in these blocks of generated code ! <T>C}DGw  
  //}}AFX_MSG 7H:1c=U  
  DECLARE_MESSAGE_MAP() I8d#AVF2  
}; <{Wsh#7}.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); il(dVW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c`yLn %Of%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }oIA*:5  
BOOL InitHotkey(); [[}KCND  
BOOL UnInit(); QmvhmsDL  
#endif ArDkJ`DE  
x=pq-&9>B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %G1kkcdH<  
#include "stdafx.h" B<SuNbR  
#include "hook.h" [8EzyB>fH  
#include <windowsx.h> aze}ko NE  
#ifdef _DEBUG U iqHUrx  
#define new DEBUG_NEW oyZ}JTl( Q  
#undef THIS_FILE <5?.s< y$"  
static char THIS_FILE[] = __FILE__; FX`SaY>D  
#endif h|$.`$  
#define MAX_KEY 100 4eMNKIsvY$  
#define CTRLBIT 0x04 9+)5#!0  
#define ALTBIT 0x02 aF7" 4^P  
#define SHIFTBIT 0x01 l~kxt2&  
#pragma data_seg("shareddata") (, Il>cR4  
HHOOK hHook =NULL; .uG|Vq1v  
UINT nHookCount =0; l`G .lM(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7E*d>:5I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ujGvrY j  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 81u}J9z;  
static int KeyCount =0; p^_2]%,QeM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift y, @I6  
#pragma data_seg() 9!6sf GZ  
HINSTANCE hins; ;i\m:8!;  
void VerifyWindow(); "q5Tw+KCfu  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) WI/&r5rq   
//{{AFX_MSG_MAP(CHookApp) ?B3   
// NOTE - the ClassWizard will add and remove mapping macros here.  i1v0J->  
// DO NOT EDIT what you see in these blocks of generated code! Nb~.6bsL  
//}}AFX_MSG_MAP oswS<t{Z  
END_MESSAGE_MAP() I?}YS-2  
0"]N9N;/  
CHookApp::CHookApp() ;^za/h>r  
{ M >#kfSF+  
 // TODO: add construction code here, X-%XZD B6  
 // Place all significant initialization in InitInstance pJ!:mt  
} 7SOi9JU_  
49q\/  
CHookApp theApp; FJDx80J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) o{5es  
{ [LDsn]{  
 BOOL bProcessed=FALSE; 7t &KKKV  
 if(HC_ACTION==nCode) 99j^<)  
 { T~@$WM(  
  if((lParam&0xc0000000)==0xc0000000){// Key up sDA&U9;  
   switch(wParam) .\K0+b;  
   { #/a>dK  
    case VK_MENU: 4jMC E&<  
     MaskBits&=~ALTBIT; T{-<G13  
     break; kXK D>."E*  
    case VK_CONTROL: ltRvNXx+]  
     MaskBits&=~CTRLBIT; [(Ss^?AJW  
     break; W'WZ@!!  
    case VK_SHIFT: ^t,sehpR:l  
     MaskBits&=~SHIFTBIT; ANh7`AUuO  
     break; wPdp!h7B~N  
    default: //judge the key and send message I/:M~ b  
     break;  0IO#h{t  
   } O}5mDx  
   for(int index=0;index<MAX_KEY;index++){ {}!`v%z  
    if(hCallWnd[index]==NULL) &Jw]3U5J  
     continue; VL4ErOoZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wm_:1~  
    { !cS A|C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w ryjs!  
     bProcessed=TRUE; M|IR7OtLV  
    } VX#4Gh,~N  
   } 7~(|q2ib  
  } fR[kjwX)<1  
  else if((lParam&0xc000ffff)==1){ //Key down  n aE;f)  
   switch(wParam) sTeW4Hnp  
   { !jZXh1g%  
    case VK_MENU: B=?4; l7  
     MaskBits|=ALTBIT; E{+V_.tlu  
     break; 80=6B  
    case VK_CONTROL: (ns> z7  
     MaskBits|=CTRLBIT; do0;"O0 (  
     break; 5H8]N#Y&  
    case VK_SHIFT: yv1Z*wTpO  
     MaskBits|=SHIFTBIT; 67<Ym0+ =  
     break; Qxb5Y)/jn  
    default: //judge the key and send message GR6BpV7  
     break; t<~$?tuZ  
   } >HMuh)  
   for(int index=0;index<MAX_KEY;index++) ,FWC|uM"  
   { AY3nQH   
    if(hCallWnd[index]==NULL) t*X k'(v  
     continue; Xi vzhI4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3zi(|B[,?  
    { 1C) l) pV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "W!Uxc  
     bProcessed=TRUE; ,.Xqb~  
    } 6%'bo`S#  
   } lU6?p")F1  
  } UOh % "h  
  if(!bProcessed){ \Nd8,hE  
   for(int index=0;index<MAX_KEY;index++){ CF"u8yE  
    if(hCallWnd[index]==NULL) 'Bul_D4B  
     continue; Dxj&9Ra  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x%<oeM3U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?&v+-4%4PI  
   } 0V:7pSC{P  
  } F/1B>2$`  
 } R Ptc \4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zg)-RCG  
} 7ip$#pzo  
Qy!*U%tG'  
BOOL InitHotkey() yc ize2>q  
{ ^B)iBf Z  
 if(hHook!=NULL){ .8[Uk^q  
  nHookCount++; /q.iUwSK>  
  return TRUE; E=PmOw7b  
 } liu%K9-r  
 else !=sM `(=~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); YXe L7W  
  if(hHook!=NULL) EtVRnI@  
   nHookCount++; M3>c?,O)J  
  return (hHook!=NULL); ]r 6S|;:  
} R`%C]uG  
BOOL UnInit() )L^GGy8w  
{ |#uA(V  
 if(nHookCount>1){ @JFfyQ {-  
  nHookCount--; -44{b<:D  
  return TRUE; !cblmF;0  
 } zT _  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l]:nncpns  
 if(unhooked==TRUE){ 2|2'?  
  nHookCount=0; kY e3A &J  
  hHook=NULL; (- ]A1WQ?  
 } iIZDtZFF  
 return unhooked; bo>4:i  
} % Q| >t~  
o{C7V *  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $_bhZnYp7  
{ /da5 "  
 BOOL bAdded=FALSE; ?f}lYQzM  
 for(int index=0;index<MAX_KEY;index++){ POZ5W)F(  
  if(hCallWnd[index]==0){ 7r,s+u.  
   hCallWnd[index]=hWnd; }r%Si  
   HotKey[index]=cKey; vR;?~^{*s  
   HotKeyMask[index]=cMask; xV]eEOiLM  
   bAdded=TRUE; 55aJ =T  
   KeyCount++; ZjCT * qx  
   break; iA=QK u!  
  } }a=<Gl|I;w  
 } @(k}q3b<  
 return bAdded; 2@&|/O6_\h  
} RXo!K iQO  
a?635*9K  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fV}:eEo|Y  
{ }F v:g!  
 BOOL bRemoved=FALSE; fgzkc"ReK  
 for(int index=0;index<MAX_KEY;index++){ UJ hmhI  
  if(hCallWnd[index]==hWnd){ H83Gx;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *OoM[wEY  
    hCallWnd[index]=NULL; \U(;%V  
    HotKey[index]=0; .O h4b5  
    HotKeyMask[index]=0; Etv!:\\[  
    bRemoved=TRUE; B;[ai?@c(_  
    KeyCount--; -eZ$wn![  
    break; >a6{y   
   } ape \zZCV  
  } qM~;Q6{v  
 } +>v3&[lGv  
 return bRemoved; !|\$|m<n  
} rGNYu\\  
% ~!A,  
void VerifyWindow() osBwX.G'l  
{ pQ:7%+Om  
 for(int i=0;i<MAX_KEY;i++){ y;'yob  
  if(hCallWnd!=NULL){ i. O670D  
   if(!IsWindow(hCallWnd)){ A>C&`A=-  
    hCallWnd=NULL; U04TVQn`  
    HotKey=0;  j<BW/  
    HotKeyMask=0; CxvL!ew  
    KeyCount--; yJyovfJz.  
   } V'-}B6 3S>  
  } ?W6qwm,?L  
 } nTG@=C#  
} 2 %`~DVo  
q:}Q5gzZ  
BOOL CHookApp::InitInstance() :TPT]q d@  
{ ! 06 !`LT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %A]?5J)Bi  
 hins=AfxGetInstanceHandle(); t[dOWgHi  
 InitHotkey(); "L?h@8sa  
 return CWinApp::InitInstance(); o7_*#5rD  
} #8cpZ]#  
O_gr{L}  
int CHookApp::ExitInstance() 0@O:C::  
{ >g{ w,  
 VerifyWindow(); b8QQS#q)V  
 UnInit(); 7? 1[sPM  
 return CWinApp::ExitInstance(); d*}dM "  
} w)nFH)f  
5c 8tH=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C i?BJ,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _m?TEq B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `f|Gw5R  
#if _MSC_VER > 1000 j=q*b Qr  
#pragma once >EacXPt-O  
#endif // _MSC_VER > 1000 /-{C,+cB  
FV 0x/)<z  
class CCaptureDlg : public CDialog 9a$\l2  
{ C>}@"eK  
 // Construction Q+ i  
 public: z(o zMH  
  BOOL bTray; &d%0[Ui`  
  BOOL bRegistered; x>C_O\  
  BOOL RegisterHotkey(); g-4m.;  
  UCHAR cKey; /i[1$/*  
  UCHAR cMask; b6]MJ0do  
  void DeleteIcon(); 3dl#:Si  
  void AddIcon(); ?3duW$`  
  UINT nCount; B.Szp_$  
  void SaveBmp(); l?f%2:}m  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor XCN^>ToD  
  // Dialog Data SV?^i`  
  //{{AFX_DATA(CCaptureDlg) Y&![2o.Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; spX*e1  
  CComboBox m_Key; .kl.awT  
  BOOL m_bControl; e >6NO  
  BOOL m_bAlt; y E; n. L  
  BOOL m_bShift; f4mQDRlD  
  CString m_Path; ;2&ym)`  
  CString m_Number; :l;SG=scx  
  //}}AFX_DATA w3<%wN>tE  
  // ClassWizard generated virtual function overrides 0gIJ&h6*f  
  //{{AFX_VIRTUAL(CCaptureDlg) 1Zr J7a7=  
 public: #M)S Ae2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9%^IMUWA  
 protected: ji&%'h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~;QzV?%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G/)]aGr  
  //}}AFX_VIRTUAL )<~v~|re  
  // Implementation \]Nt-3|`0  
 protected: E!s?amM4  
  HICON m_hIcon; R(1N]>  
  // Generated message map functions rLKwuZ  
  //{{AFX_MSG(CCaptureDlg) *LZB.84  
  virtual BOOL OnInitDialog(); ((AsZ$[S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bTd94  
  afx_msg void OnPaint(); ,B'n0AO/'  
  afx_msg HCURSOR OnQueryDragIcon(); pm4'2B|)g  
  virtual void OnCancel(); F7"v}K]X  
  afx_msg void OnAbout(); 9kO}054  
  afx_msg void OnBrowse(); SK]"JSY`  
  afx_msg void OnChange(); c %f'rj  
 //}}AFX_MSG eoGGWW@[  
 DECLARE_MESSAGE_MAP() yGs:3KI  
}; |<aF)S4  
#endif g'pB<?'E'  
S9;:)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (Qp53g  
#include "stdafx.h" (c\i.z  
#include "Capture.h" &OXWD]5$6  
#include "CaptureDlg.h" G@(ukt`0}  
#include <windowsx.h> !A|ayYBb\  
#pragma comment(lib,"hook.lib")  %&81xAt  
#ifdef _DEBUG 8 Buus  
#define new DEBUG_NEW `,7;2ZG~O  
#undef THIS_FILE vNn$dc  
static char THIS_FILE[] = __FILE__; dBeZx1Dy  
#endif aGx[?}=  
#define IDM_SHELL WM_USER+1 }rKKIF^f\S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .B?J@,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~USU\dni  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qrLE1b 1$  
class CAboutDlg : public CDialog SO#R5Mu2N  
{ M~O$ ,dof  
 public: +8zC ol?j  
  CAboutDlg(); BXx l-x  
  // Dialog Data P-LdzVt(^  
  //{{AFX_DATA(CAboutDlg) )zMsKfQ  
  enum { IDD = IDD_ABOUTBOX }; |9;MP&68  
  //}}AFX_DATA Y2 oN.{IH  
  // ClassWizard generated virtual function overrides W*!u_]K>  
  //{{AFX_VIRTUAL(CAboutDlg) !C>'a:  
 protected: >&-" X# :  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }|-Yd"$  
  //}}AFX_VIRTUAL km=d'VvnI  
  // Implementation Eo@b)h  
 protected: CW . O"_  
  //{{AFX_MSG(CAboutDlg) rv2 6vnJy"  
  //}}AFX_MSG n B. u5  
  DECLARE_MESSAGE_MAP() B4/\RC2  
}; Z]\IQDC  
)2Dm{T  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) })TXX7[h  
{ s6HfN'  
 //{{AFX_DATA_INIT(CAboutDlg) h;RKF\U:"  
 //}}AFX_DATA_INIT E!6Nf[  
} M!Wjfq ^~  
a(|,KWHn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 92pl#Igt  
{ qCUn. mI  
 CDialog::DoDataExchange(pDX); vbMt}bM(GD  
 //{{AFX_DATA_MAP(CAboutDlg) Dxx`<=&g  
 //}}AFX_DATA_MAP JZom#A. dt  
} JXNfE,_  
 #-^y9B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l6y*SW5+  
 //{{AFX_MSG_MAP(CAboutDlg) Uoqt  
 // No message handlers wx*)7Y*  
 //}}AFX_MSG_MAP d~za%2{  
END_MESSAGE_MAP() Yd>ej1<  
Xt%>XP  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WVkJ=r0Ny  
: CDialog(CCaptureDlg::IDD, pParent) ;qwN M~  
{ # ZcFxB6)  
 //{{AFX_DATA_INIT(CCaptureDlg) Ar iW&E  
  m_bControl = FALSE; >SSRwYIN  
  m_bAlt = FALSE; OO  /Pc  
  m_bShift = FALSE; kA/V=xO<  
  m_Path = _T("c:\\"); \66j4?H#  
  m_Number = _T("0 picture captured."); 0<4Sw j3s7  
  nCount=0; m! H7;S-(  
  bRegistered=FALSE; #>[5NQ;$'  
  bTray=FALSE; !tckE\ h#N  
 //}}AFX_DATA_INIT 1XD|H_JG<j  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 TxDzGC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g0M9v]c  
} 5IfyD ]<  
tI;pdR]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |`c=`xK7'  
{ n>##,o|Vr#  
 CDialog::DoDataExchange(pDX); NUjo5.7  
 //{{AFX_DATA_MAP(CCaptureDlg) \Bg?QhA_D  
  DDX_Control(pDX, IDC_KEY, m_Key);  `xm4?6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  `GQ'yv  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Qf<@ :T*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r-]HmY x  
  DDX_Text(pDX, IDC_PATH, m_Path); A3cW8 OClz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^cz;UQX~}  
 //}}AFX_DATA_MAP |d0,54!  
} cUPC8k.1  
<RPy   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O%R*1 P9  
//{{AFX_MSG_MAP(CCaptureDlg) "<LVA2v;  
 ON_WM_SYSCOMMAND() |8<P%:*N  
 ON_WM_PAINT() 0//B+.#  
 ON_WM_QUERYDRAGICON() P3u,)P&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1~_&XNb&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w=K!U]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) tMnwY'  
//}}AFX_MSG_MAP Rd|xw%R\mb  
END_MESSAGE_MAP() fD:>cje  
Eg;xj@S<2  
BOOL CCaptureDlg::OnInitDialog() n>["h2  
{ =3= $F%  
 CDialog::OnInitDialog(); ;xMieqz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SWZA`JVK  
 ASSERT(IDM_ABOUTBOX < 0xF000); -0R;C`(!  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r@9qjva  
 if (pSysMenu != NULL) I nCo[ 8SI  
 { LjOHlT'  
  CString strAboutMenu; di,?`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Xj+oV  
  if (!strAboutMenu.IsEmpty()) WUesTA>  
  { @*{sj`AS '  
   pSysMenu->AppendMenu(MF_SEPARATOR); F>!gwmn~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ZUiI nO  
  } X&+*?Q^  
 } `*to( )  
 SetIcon(m_hIcon, TRUE); // Set big icon hD I}V 1)  
 SetIcon(m_hIcon, FALSE); // Set small icon .)Af&+KT  
 m_Key.SetCurSel(0); g-cC&)0Q  
 RegisterHotkey(); i rRe}  
 CMenu* pMenu=GetSystemMenu(FALSE); e9e7_QG_-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $GcVI ;a  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); JLZ=$d  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); MG6y  
 return TRUE; // return TRUE unless you set the focus to a control eKj'[2G@/  
} g3"eEg5NY  
w\PCBY=  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O"Ua|8  
{ #vnJJ#uI|>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |Vq&IfP  
 { 3$hbb6N%6.  
  CAboutDlg dlgAbout; k=o>DaEh(  
  dlgAbout.DoModal(); SFdSA4D"  
 } nL[ zXl  
 else W<"{d  
 { us,1:@a)a  
  CDialog::OnSysCommand(nID, lParam); tm[e?+Iq  
 } 2*<'=*zaQ  
} 5/{";k)L+  
3jG #<4;J  
void CCaptureDlg::OnPaint() yk<$XNc  
{ PiTe/  
 if (IsIconic()) _ o-lNt+  
 { :a#p zEK  
  CPaintDC dc(this); // device context for painting u|'}a3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *w[\(d'T  
  // Center icon in client rectangle !R/- |Kjy  
  int cxIcon = GetSystemMetrics(SM_CXICON); lxvRF93a.  
  int cyIcon = GetSystemMetrics(SM_CYICON); $4j$c|S!  
  CRect rect; Q'mLwD3>  
  GetClientRect(&rect); y_Tc$g~  
  int x = (rect.Width() - cxIcon + 1) / 2; S5$sB{\R  
  int y = (rect.Height() - cyIcon + 1) / 2; D#?jddr-  
  // Draw the icon ju= +!nGUa  
  dc.DrawIcon(x, y, m_hIcon); ZO!  
 } ,*w  
 else BL&D|e  
 { QlFt:?7f  
  CDialog::OnPaint(); H^e0fm  
 } kQY+D1  
} E*F)jP,yo  
^ew<|J2,B  
HCURSOR CCaptureDlg::OnQueryDragIcon() =:;KY uTr  
{ xn)eb#r  
 return (HCURSOR) m_hIcon; 3n=`SLj/a  
} qXQ/M]  
k;?Oi?]  
void CCaptureDlg::OnCancel() \f AL:mJ  
{ L`!M3c@u  
 if(bTray) i47xF7y\  
  DeleteIcon(); O!c b-  
  CDialog::OnCancel(); Qf}^x9'  
} (^Q:zU  
3hrODts  
void CCaptureDlg::OnAbout() UOg4 E  
{ H%*< t}  
 CAboutDlg dlg; l6C^,xU~IX  
 dlg.DoModal(); =`l).GnN2`  
} { _]'EK/w  
5"]t{-PD  
void CCaptureDlg::OnBrowse() >,JA=s  
{ kZ0|wML8  
 CString str; bxS+ R\  
 BROWSEINFO bi; D3>;X=1  
 char name[MAX_PATH]; j+_pF<$f:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4&+;n[D  
 bi.hwndOwner=GetSafeHwnd(); B:pIzCP  
 bi.pszDisplayName=name; (xJZeY)-b^  
 bi.lpszTitle="Select folder"; L,XWX8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jb~/>I^1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); H$/r{gfg^  
 if(idl==NULL) h]#wwJF  
  return; 7fOk]Yl[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tv+H4/  
 str.ReleaseBuffer(); N~%F/`Z<+  
 m_Path=str; ~alC5|wCUQ  
 if(str.GetAt(str.GetLength()-1)!='\\') gD\  =  
  m_Path+="\\";  MR/8  
 UpdateData(FALSE); $6c8<!B_  
} E!eBQ[@  
BK_x5mGu3  
void CCaptureDlg::SaveBmp() cN{-&\ 6L  
{ Dw@0P  
 CDC dc; B>11  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +P&;cCV`S3  
 CBitmap bm; vIoV(rc+  
 int Width=GetSystemMetrics(SM_CXSCREEN); #\[((y:q  
 int Height=GetSystemMetrics(SM_CYSCREEN); [,F5GW{x  
 bm.CreateCompatibleBitmap(&dc,Width,Height); r=" wd  
 CDC tdc; gGiLw5o,  
 tdc.CreateCompatibleDC(&dc); r# }`{C;+5  
 CBitmap*pOld=tdc.SelectObject(&bm); 9\|n2$H:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -F+dRzxH  
 tdc.SelectObject(pOld); "SuBtoK  
 BITMAP btm; -n-rKN.T  
 bm.GetBitmap(&btm); ;!CYp; _  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; DJtKLG0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); mkCv  f  
 BITMAPINFOHEADER bih; nr#DE?  
 bih.biBitCount=btm.bmBitsPixel; kW#{[,7r  
 bih.biClrImportant=0; "))G|+tz  
 bih.biClrUsed=0; 0ang^v;q  
 bih.biCompression=0; WrR97]7t  
 bih.biHeight=btm.bmHeight; @+v;B:  
 bih.biPlanes=1;  [>'P  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1!x-_h}  
 bih.biSizeImage=size; dJhT}"x  
 bih.biWidth=btm.bmWidth; WheJ 7~  
 bih.biXPelsPerMeter=0; 1,p[4k~Ww  
 bih.biYPelsPerMeter=0; S >PTD@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Lmy ^/P%  
 static int filecount=0; ugM,wT&~Y  
 CString name; dz',!|>  
 name.Format("pict%04d.bmp",filecount++); WH.5vrY Z  
 name=m_Path+name; M~/%V NX  
 BITMAPFILEHEADER bfh; 0Wf,SYx`s  
 bfh.bfReserved1=bfh.bfReserved2=0; }Om+,!_d  
 bfh.bfType=((WORD)('M'<< 8)|'B'); TB]B l.  
 bfh.bfSize=54+size; r$~w3yN)v  
 bfh.bfOffBits=54; oJF@O:A  
 CFile bf; {e4ILdXM  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D3LW 49  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C} #:<Jx  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u/5I;7cb  
  bf.WriteHuge(lpData,size); p",HF%  
  bf.Close(); t} E 1NXW  
  nCount++; mW_<c,3D.  
 } /"t*gN=wrF  
 GlobalFreePtr(lpData); x,\PV>   
 if(nCount==1) a*}ZT,V  
  m_Number.Format("%d picture captured.",nCount); Z=sCYLm  
 else )+[{MR '  
  m_Number.Format("%d pictures captured.",nCount); YQ`GOP#/  
  UpdateData(FALSE); 8F(_Vqu  
} eZ]4,,m  
P5+FZzQ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0Ts[IHpg&E  
{ 5@$b@jTd  
 if(pMsg -> message == WM_KEYDOWN) M]?#]3XBNo  
 { "+js7U-  
  if(pMsg -> wParam == VK_ESCAPE) -f.<s!a  
   return TRUE; &#'[]V%^F  
  if(pMsg -> wParam == VK_RETURN) 4#?Ox vH  
   return TRUE; p7Yej(B  
 } .[1"Med J  
 return CDialog::PreTranslateMessage(pMsg); ':71;^zXf  
} JLsy|}>  
8v6YOG"b q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  Efsfuv  
{ w0x%7mg@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ UW+|1Bj_:  
  SaveBmp(); R qS2Qo]  
  return FALSE; %@Nuzdp  
} taXS>*|B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Q:\I %o  
 CMenu pop; ]3_oT^$:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ) MFa~/x  
 CMenu*pMenu=pop.GetSubMenu(0); ~n#rATbxf  
 pMenu->SetDefaultItem(ID_EXITICON); W@w#A]  
 CPoint pt; o$4n D#P3  
 GetCursorPos(&pt); L Ty [)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &|7pu=  
 if(id==ID_EXITICON) )1a3W7  
  DeleteIcon(); X I\zEXO  
 else if(id==ID_EXIT) YCwfrz  
  OnCancel(); $X~4J  
 return FALSE; +I0?D  
} -r_/b  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &eQF[8 ,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dA[Z\  
 AddIcon(); 00'R1q4  
 return res; C+-xC~  
} {~a=aOS  
k,S'i#4q4  
void CCaptureDlg::AddIcon() %|[+\py$Q  
{ NZ/>nNs  
 NOTIFYICONDATA data; />(e.)f  
 data.cbSize=sizeof(NOTIFYICONDATA); 1}mI zrY  
 CString tip; oc,a  
 tip.LoadString(IDS_ICONTIP); IZczHHEL`b  
 data.hIcon=GetIcon(0); Z 4uft  
 data.hWnd=GetSafeHwnd(); $ u`y  
 strcpy(data.szTip,tip); zq g4@" p  
 data.uCallbackMessage=IDM_SHELL; w%Tcx^:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Wyf+xr'Ky  
 data.uID=98; v;X'4/ M  
 Shell_NotifyIcon(NIM_ADD,&data); 87zsV/  
 ShowWindow(SW_HIDE); <">tB"="b  
 bTray=TRUE; k9`Bi`wp  
} '{j.5~4y  
z#*w Na&@[  
void CCaptureDlg::DeleteIcon() xtyzy@)QL  
{ ( Kh<qAP_n  
 NOTIFYICONDATA data; 4"fiEt,t<x  
 data.cbSize=sizeof(NOTIFYICONDATA); D}l^ow  
 data.hWnd=GetSafeHwnd(); 89:Ys=  
 data.uID=98; f5+a6s9  
 Shell_NotifyIcon(NIM_DELETE,&data); QfJ?'*  
 ShowWindow(SW_SHOW); UUy|/z%  
 SetForegroundWindow(); }3cOZd_,t  
 ShowWindow(SW_SHOWNORMAL); _"%ef"oPh  
 bTray=FALSE; yw`xK2(C$  
} |HXI4 MU"  
X62h7?'Pd  
void CCaptureDlg::OnChange() 'u$e2^  
{ s4bLL  
 RegisterHotkey(); T_O\L[]p*  
} MV5'&" ,oB  
s{#ZRmc2B  
BOOL CCaptureDlg::RegisterHotkey() |:n4t6  
{ FA ?xp1E  
 UpdateData(); w+bQpIP M  
 UCHAR mask=0; r# 5))q-  
 UCHAR key=0; 3Xaw  
 if(m_bControl) _B)LRD+Hj  
  mask|=4; I~EQuQ>=  
 if(m_bAlt) jQOY\1SR  
  mask|=2; ` /JJ\`Pu  
 if(m_bShift) mmm025.   
  mask|=1; ,p/iN9+Z  
  key=Key_Table[m_Key.GetCurSel()]; Esw#D90q  
 if(bRegistered){ /j!?qID  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); QA\eXnR  
  bRegistered=FALSE; 2/f:VB?<T  
 } ymSGB`CP  
 cMask=mask; P]-d (N}/H  
 cKey=key; VZ{aET!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); J')Dt]/9  
 return bRegistered; XX",&cp02V  
} Wq8Uq}~_g  
RG|]Kt8  
  四、小结 ?V%x94B  
W'6~`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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