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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: o;FjpZ  
  Zm%}AzM  
  一、实现方法 n-,~Bp [  
]@l~z0^|[_  
  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: nhk +9  
N rVQK}%K  
#pragma data_seg("shareddata") dDW],d}B;  
HHOOK hHook =NULL; //钩子句柄 RUf,)]Vvk  
UINT nHookCount =0; //挂接的程序数目 /7@@CG6b  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }^G'oR1LF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C JiMg'K  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @SPmb o  
static int KeyCount =0; ",E6)r  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #:T5_9p  
#pragma data_seg() yHQ.EZ~%  
T7m rOp  
  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。 ^]'p927  
*-Lnsi^7v  
  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: ,qiS;2(  
9L%&4V}BIS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9^0 'VRG  
cKey,UCHAR cMask) @l"GfDf L9  
{ JC{}iG6r+  
 BOOL bAdded=FALSE; kSU*d/}*u  
 for(int index=0;index<MAX_KEY;index++){ <S $Z  
  if(hCallWnd[index]==0){ )%;#~\A  
   hCallWnd[index]=hWnd; `]5XY8^kI  
   HotKey[index]=cKey; {eIE|   
   HotKeyMask[index]=cMask; tRbZ^5x\@  
   bAdded=TRUE; U,iTURd  
   KeyCount++; #` z!f0 P  
   break; oLruYSaD  
  } }y|% wym  
 } Uvf-h4^J]:  
 return bAdded; /qI80KVnN  
} 9<7Q{  
//删除热键 $0LlaN@e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a9QaFs"  
{ @pytHN8( $  
 BOOL bRemoved=FALSE; 1{o CMq/v  
 for(int index=0;index<MAX_KEY;index++){ CvQ LF9|  
  if(hCallWnd[index]==hWnd){ 1Od: I}@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]*i>KR@G  
    hCallWnd[index]=NULL; VmBLNM?  
    HotKey[index]=0; g?j"d{.9t  
    HotKeyMask[index]=0; qFUpvTe  
    bRemoved=TRUE; \_x)E]D  
    KeyCount--; 5 1 x^gX|  
    break; 2:pq|eiF  
   } DLS-WL  
  } @GnsW;$*~.  
 } L8bq3Q'p  
 return bRemoved; "%f>/k;!h.  
} OFRzzG@  
k% In   
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  DLL中的钩子函数如下: MM'<uy  
d /t'N-m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -2 tZ  
{ `R:<(:  
 BOOL bProcessed=FALSE; Q7=J[,V:2  
 if(HC_ACTION==nCode) y9s5{\H  
 { q<hN\kBs  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 sE/9~L  
   switch(wParam) Pv1psKu  
   {  Y%=A>~s*c:  
    case VK_MENU: WR'A%"qBwi  
     MaskBits&=~ALTBIT; 'c &Bmd40  
     break; MIR17%G  
    case VK_CONTROL: Q&QR{?PMD  
     MaskBits&=~CTRLBIT; 7/*; rT  
     break; oAvJ"JH@i  
    case VK_SHIFT: oR-_=U^  
     MaskBits&=~SHIFTBIT; t9K.Jc0  
     break; zv0RrF^  
    default: //judge the key and send message 2tWUBt\,g  
     break; (O`=$e  
   } +IS$Un  
   for(int index=0;index<MAX_KEY;index++){ r<|\4zIo/  
    if(hCallWnd[index]==NULL) >F-J}P  
     continue; ._FgQ` `PL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v(: VUo]H  
    { Zfb:>J@h6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (n`\b47  
     bProcessed=TRUE; qtgK}*9ptv  
    } %mcuYR'D}  
   } !)\`U/.W  
  } xE6y9"}!h  
  else if((lParam&0xc000ffff)==1){ //有键按下 s?`)[K'-  
   switch(wParam) /`s^.Xh  
   { P@5^`b|  
    case VK_MENU: DV%tby  
     MaskBits|=ALTBIT; zkd#vAY(A  
     break; _K;rM7  
    case VK_CONTROL: O-y"]Wrv  
     MaskBits|=CTRLBIT; ?QuFRl,ZJ  
     break; xxV{1, H2  
    case VK_SHIFT: +=}% 7o  
     MaskBits|=SHIFTBIT; e.HN%LrhS  
     break; <0kRky$  
    default: //judge the key and send message Q ?Nzt;)!.  
     break; (c} 0Sg  
   } {M%"z,GL7J  
   for(int index=0;index<MAX_KEY;index++){ C*78ZwZ  
    if(hCallWnd[index]==NULL) "M:arP5f  
     continue; n]o+KT\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5cfzpOqr0  
    { C*gSx3OG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lO9>?y8.y  
     bProcessed=TRUE; Yd<~]aXM   
    } -d[x 09  
   } S`6'~g  
  } n `n3[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 72{kig9c  
   for(int index=0;index<MAX_KEY;index++){ NA3yd^sr  
    if(hCallWnd[index]==NULL) M"_XaVl  
     continue; 2i>xJMW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T@RzY2tz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @DUdgPA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )0GnTB;5Z  
   } O]PfQ  
  } tlcA\+%)  
 } }6S4yepl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >`NM?KP s  
} ? {&#l2  
m+u>%Ys`  
  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: )5&m:R9  
vEgJmHv;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J}YI-t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J-QQ!qa0  
e6_.ID'3  
  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: 2;&13%@!  
! \gRXP}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oqY?#p/  
{ Xoik%T-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b%_QL3 m6  
 { +(/Z=4;,[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1a)_Lko  
  SaveBmp(); 34?yQX{  
  return FALSE; ~/#?OLj(T  
 } DRzpV6s  
 …… //其它处理及默认处理 DQ9s57VxC!  
} 7<tqT @c  
b\+|g9Tm  
n$P v2qw  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 lLJb3[ e.  
XWvs~Xw@  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8bysg9H0  
}3*h`(Bv7  
  二、编程步骤 .*f;v4!  
<.' cCY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; J`8>QMK^5  
s<dD>SU  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @t2 Q5c  
SKtEEFyIR_  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 7L\GI`y  
y$&a(S]  
  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; 2$Ji4`p}S  
GHlra^  
  5、 添加代码,编译运行程序。 njX:[_&  
g SwG=e\  
三、程序代码 QbNv+Eu5  
jQr~@15J#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $XI<s$P%(%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) PRLV1o1#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ljis3{kn""  
#if _MSC_VER > 1000 bOFLI#p&  
#pragma once kg61Dgu  
#endif // _MSC_VER > 1000 ;`+RSr^8$  
#ifndef __AFXWIN_H__ sogbD9Jc  
#error include 'stdafx.h' before including this file for PCH 87Uv+((H  
#endif 2%<jYm#'z-  
#include "resource.h" // main symbols }?~uAU-  
class CHookApp : public CWinApp O}`01A!u;  
{ :aqh8b v  
 public: \|pAn  
  CHookApp(); T7T!v  
  // Overrides <F3sQAe  
  // ClassWizard generated virtual function overrides aK>9:{]ez  
  //{{AFX_VIRTUAL(CHookApp) ]Tl\9we  
 public: nSow$6T_  
  virtual BOOL InitInstance(); MU e 'xK  
  virtual int ExitInstance(); xh6x B|Z  
  //}}AFX_VIRTUAL otIJ[Mvyq  
  //{{AFX_MSG(CHookApp) ?.A|Fy^  
  // NOTE - the ClassWizard will add and remove member functions here. pkU e|V  
  // DO NOT EDIT what you see in these blocks of generated code ! u7C{>  
  //}}AFX_MSG 2%qn !+.  
  DECLARE_MESSAGE_MAP() Wu4Nq+  
}; "[?/I3 {E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?xo,)``  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u20b+c4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _]S6>  
BOOL InitHotkey(); +{%4&T<nHw  
BOOL UnInit(); 55cldo   
#endif ]6;AK\9TM  
7, 13g)  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9HE(*S  
#include "stdafx.h" G}-.xj]  
#include "hook.h" 4d 3Znpf  
#include <windowsx.h> &v-V_.0(H  
#ifdef _DEBUG 5>@uEebkv]  
#define new DEBUG_NEW L@4zuzmlb  
#undef THIS_FILE LA?\~rh!  
static char THIS_FILE[] = __FILE__; Z :9VxZ  
#endif j~E +6f \  
#define MAX_KEY 100 HV9SdJOf  
#define CTRLBIT 0x04 SN{*:\>,  
#define ALTBIT 0x02 5An0D V5  
#define SHIFTBIT 0x01 N Sh.g #  
#pragma data_seg("shareddata") B R:  
HHOOK hHook =NULL; r^E]GDz  
UINT nHookCount =0; mCt>s9a)H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &o/4hnHYt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (K6`nWk2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @Y<tH,*  
static int KeyCount =0; uT/B}`md  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift h*KHEg"+  
#pragma data_seg() a-E-hX2  
HINSTANCE hins; w~U`+2a3  
void VerifyWindow(); rc$!$~|I3Z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6}T%m?/}  
//{{AFX_MSG_MAP(CHookApp) W|#ev*'F  
// NOTE - the ClassWizard will add and remove mapping macros here. euhZ4+  
// DO NOT EDIT what you see in these blocks of generated code! cXY'>N  
//}}AFX_MSG_MAP =[K)<5,@  
END_MESSAGE_MAP() ]pV1T  
=b!J)]  
CHookApp::CHookApp() {?mQqoZ?.  
{ y<1$^Y1/)  
 // TODO: add construction code here, Z&w^9;30P  
 // Place all significant initialization in InitInstance ^CPfo/!  
} 0Mu8ZVI{  
o$ce1LO?|N  
CHookApp theApp; KF_Wu}q d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^A[`NYK  
{ '98h<(@]  
 BOOL bProcessed=FALSE; ~{vdP=/WP  
 if(HC_ACTION==nCode) MgQU6O<  
 { "-n%874IT  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3> #mO}\  
   switch(wParam) 6eT'[Umx  
   { GWInN8.5  
    case VK_MENU: ZGpTw[5ql  
     MaskBits&=~ALTBIT; @pG lWw9*  
     break; uT}TSwgp  
    case VK_CONTROL: b3b~T]]  
     MaskBits&=~CTRLBIT; UB$`;'|i  
     break; 2rCY&8  
    case VK_SHIFT: }=hoATs  
     MaskBits&=~SHIFTBIT; X^D9)kel  
     break; +%Y c4  
    default: //judge the key and send message mp,e9Nd;  
     break; N+M&d3H`  
   } n<:d%&^n  
   for(int index=0;index<MAX_KEY;index++){ vaRwh E:  
    if(hCallWnd[index]==NULL) dA} 72D?  
     continue; MpA;cw]cI/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z g7l>9Sc  
    { 'n[+r}3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +qUkMx  
     bProcessed=TRUE; J`q}Ry;   
    } Yv>BOK  
   } 2]} Uov  
  } +&7Kk9^  
  else if((lParam&0xc000ffff)==1){ //Key down ,=Nw(GI  
   switch(wParam) `8(h,aj;  
   { o? i.v0@!K  
    case VK_MENU: v] T(z L|  
     MaskBits|=ALTBIT; 5 Y Q  
     break; 1_NG+H]x9  
    case VK_CONTROL: lP*  
     MaskBits|=CTRLBIT; f5aF6FBH  
     break; 6%kJDY.  
    case VK_SHIFT: bqrJP3  
     MaskBits|=SHIFTBIT; qggk:cN1  
     break; Dk`4bYK  
    default: //judge the key and send message 43>9)t  
     break; Pc(n@'m~  
   } rMHQzQ0%  
   for(int index=0;index<MAX_KEY;index++) ?7uK P}1|  
   { Aw4?y[{H  
    if(hCallWnd[index]==NULL) 1/2V.:bg  
     continue; ,|.8nk"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xIQ/$[&v  
    { MkDK/K$s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;T.s!B$Uu  
     bProcessed=TRUE; nU&NopD+*G  
    } b6nZ55 h  
   } $>r>0S#+\&  
  } S\9t4Ki_'  
  if(!bProcessed){ @0z0m;8  
   for(int index=0;index<MAX_KEY;index++){ @fqV0l!GR  
    if(hCallWnd[index]==NULL) I f3{E  
     continue; A~SL5h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2;4]PRD6w  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <!~1{`n%9J  
   } @VC .>  
  } LZr0]g{Pu/  
 } G#e9$!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (!*Xhz,(-  
} tL~,ZCQz  
E-)VPZ1D  
BOOL InitHotkey() ]3t1=+  
{ ]$~Fzs  
 if(hHook!=NULL){ _ktK+8*6`  
  nHookCount++; + UK%t>E8  
  return TRUE; s:+HRJD|  
 } pw,O"6J*  
 else Jcz]J)|5v  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _8Nw D_"  
  if(hHook!=NULL) U g}8y8  
   nHookCount++; !/Iq{2LX  
  return (hHook!=NULL); 0]T.Lh$3  
} rQ~\~g[tP  
BOOL UnInit() 1BQ0M{&  
{ fvcW'T}r  
 if(nHookCount>1){ {f+N]Oo*  
  nHookCount--; ME$2P!o  
  return TRUE; A*8m8Sh$  
 } YDQ:eebg(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); GilQtd3\  
 if(unhooked==TRUE){ M{?zvq?d  
  nHookCount=0; DX}B0B  
  hHook=NULL; TGU:(J'^  
 } R_Zv'y6  
 return unhooked; w9RF2J  
} .dx 4,|6  
&?.n2+T+ =  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (C daE!I4Q  
{ 48 W.qzC  
 BOOL bAdded=FALSE; BBHK  
 for(int index=0;index<MAX_KEY;index++){ *16<M)7  
  if(hCallWnd[index]==0){ '|l%rv  
   hCallWnd[index]=hWnd; Bo`Tl1K#  
   HotKey[index]=cKey; {=3J/)='  
   HotKeyMask[index]=cMask; X'fuF2owd  
   bAdded=TRUE; %#~((m1  
   KeyCount++; n*4lz^LR  
   break; oZTgN .q  
  } 4k8*E5cx  
 } <9P4}`%)3  
 return bAdded; M|\^UF2e  
} o#qH2)tb  
CRH{E}>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lVPOYl%  
{ 9G0D3F  
 BOOL bRemoved=FALSE; s\[LpLt  
 for(int index=0;index<MAX_KEY;index++){ KZ=u54  
  if(hCallWnd[index]==hWnd){ ;{vwBDV!'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lT8#bA  
    hCallWnd[index]=NULL; 3&'2aW   
    HotKey[index]=0; <W>++< -  
    HotKeyMask[index]=0; *7ZGq(O  
    bRemoved=TRUE; dj'm, k b  
    KeyCount--; 9\HR60V  
    break; sI_7U^"[  
   } eGm:)   
  } ]' Y|N l  
 } !p9)CjQ"  
 return bRemoved; yuOS&+,P  
} veeI==]  
+nZUL*Ut/  
void VerifyWindow() HBH$  
{ qO-9 x0v#  
 for(int i=0;i<MAX_KEY;i++){ /<);=&[  
  if(hCallWnd!=NULL){ vT|`%~Be  
   if(!IsWindow(hCallWnd)){ HPrq1QpK  
    hCallWnd=NULL; q:I$EpKf?Q  
    HotKey=0; j5Qo*p  
    HotKeyMask=0; ,`k _|//}=  
    KeyCount--; K]c4"JJ  
   } kb71q:[  
  } j^flwk  
 } \v+u;6cx_  
} ~#R9i^Y  
'JieIKu  
BOOL CHookApp::InitInstance() C|MQ $~5:w  
{ ,~COZi;R.D  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); rcV-_+KE(B  
 hins=AfxGetInstanceHandle(); 8WL8/  
 InitHotkey(); 0Vkl`DmeM.  
 return CWinApp::InitInstance(); e  ^Ds  
} 'Gx$Bj  
NYwR2oX  
int CHookApp::ExitInstance() G8nrdN-9  
{ .`jo/,?+O  
 VerifyWindow(); z-dFDtiA  
 UnInit(); -w1@!Sdd  
 return CWinApp::ExitInstance(); J'b<z.OW  
} > _ <'D  
F/p,j0S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file y%S1ZT ScO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .%}?b~  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (a@?s$LG  
#if _MSC_VER > 1000 W+Xz$j/u  
#pragma once Z\~G U*Y.e  
#endif // _MSC_VER > 1000 ~e `Bq>  
Kz jC/1sd  
class CCaptureDlg : public CDialog c~0{s>  
{ oc7$H>ET1  
 // Construction CS 8jA\  
 public: TX}T|ri  
  BOOL bTray; (hB?  
  BOOL bRegistered; "9IYB)Js  
  BOOL RegisterHotkey(); (-0ePSOG  
  UCHAR cKey; ZrO!L_/  
  UCHAR cMask; +x=)/;:  
  void DeleteIcon(); 33'Y[4  
  void AddIcon(); ljC(L/I  
  UINT nCount; ?WUF!Jk  
  void SaveBmp(); +-<}+8G;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >5hhd38  
  // Dialog Data (@r `$5D.b  
  //{{AFX_DATA(CCaptureDlg) #*9-d/K  
  enum { IDD = IDD_CAPTURE_DIALOG };  7I=C+  
  CComboBox m_Key; !8 -oR6/$%  
  BOOL m_bControl; 4jNG^@O  
  BOOL m_bAlt; =PkO!Mm8  
  BOOL m_bShift; QSw<%pcJE@  
  CString m_Path; ht=P\E  
  CString m_Number;  R'}95S<  
  //}}AFX_DATA ~1 ~Xfo>  
  // ClassWizard generated virtual function overrides |&3x#1A  
  //{{AFX_VIRTUAL(CCaptureDlg) P`$!@T0=  
 public: JhHWu<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7 <9yH:1  
 protected: D}3T|N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UlcH%pxTt1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JIm4vS  
  //}}AFX_VIRTUAL T!RT<&  
  // Implementation 1PH: \0}  
 protected: ke_ [  
  HICON m_hIcon; `'I{U5;e  
  // Generated message map functions ]:(W_ qEA  
  //{{AFX_MSG(CCaptureDlg) omSM:f_~  
  virtual BOOL OnInitDialog(); dq\FBwfe  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6at1bQ$  
  afx_msg void OnPaint(); bWWXc[O2&(  
  afx_msg HCURSOR OnQueryDragIcon(); %FZ2xyI.  
  virtual void OnCancel(); {ZU1x C  
  afx_msg void OnAbout(); Rk6deI]  
  afx_msg void OnBrowse(); ({s6eqMhDd  
  afx_msg void OnChange(); S4UM|`  
 //}}AFX_MSG t5B7I59  
 DECLARE_MESSAGE_MAP() g{IF_ 1  
}; NVKC'==0  
#endif 6%,C_7j  
~y HU^5D  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file DdQ;Q5|  
#include "stdafx.h" r]@0eb   
#include "Capture.h" V7d) S&*V  
#include "CaptureDlg.h" *NFg;<:j  
#include <windowsx.h> )s_n  
#pragma comment(lib,"hook.lib") cD*}..-/4  
#ifdef _DEBUG lot%N(mB`  
#define new DEBUG_NEW kIHDeo%K}  
#undef THIS_FILE <%.5hCTp97  
static char THIS_FILE[] = __FILE__; VKp*9%9  
#endif b[9&l|y^  
#define IDM_SHELL WM_USER+1 /X"/ha!=&D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7?j;7.i s(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S$TmZk=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fyTAou6hI  
class CAboutDlg : public CDialog , DdB^Ig<r  
{ YB<*"HxM)}  
 public: ;Uc0o!1  
  CAboutDlg(); qgIb/6;xQ  
  // Dialog Data +gd4\ZG  
  //{{AFX_DATA(CAboutDlg) r={c,i  
  enum { IDD = IDD_ABOUTBOX }; ho8`sh>N  
  //}}AFX_DATA l^GP3S  
  // ClassWizard generated virtual function overrides k.<]4iS  
  //{{AFX_VIRTUAL(CAboutDlg) PZxAH9 S?  
 protected: <+MyZM(z>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]i(-I <`  
  //}}AFX_VIRTUAL 8Jf.ECQT  
  // Implementation 9. 'h^#C  
 protected: [(X y.L7x  
  //{{AFX_MSG(CAboutDlg) 'c2W}$q  
  //}}AFX_MSG XU!2YO)t;!  
  DECLARE_MESSAGE_MAP() -9N@$+T  
}; S/|,u`g-  
:B3[:MpL}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j',W 64  
{ k@zy  
 //{{AFX_DATA_INIT(CAboutDlg) *eI)Z=8  
 //}}AFX_DATA_INIT [Wd-Zn%  
} ]Chj T}  
`&\Q +W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) theZ]5_C  
{ ahx>q  
 CDialog::DoDataExchange(pDX); JB!:JML  
 //{{AFX_DATA_MAP(CAboutDlg) sn7AR88M;  
 //}}AFX_DATA_MAP |*Z$E$k:  
} Lg8nj< TF  
*I}`dC[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'iLpE7  
 //{{AFX_MSG_MAP(CAboutDlg) ~ wg:!VWA)  
 // No message handlers X%yO5c\l2  
 //}}AFX_MSG_MAP 720P jQ  
END_MESSAGE_MAP() DZzN>9<)^  
l/;X?g5+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :0Z^uuk`gq  
: CDialog(CCaptureDlg::IDD, pParent) ?X@fKAj  
{ n]8<DX99Q0  
 //{{AFX_DATA_INIT(CCaptureDlg) W3`>8v1?o  
  m_bControl = FALSE; zJe#m|Z  
  m_bAlt = FALSE; f{SB1M   
  m_bShift = FALSE; @`\VBW  
  m_Path = _T("c:\\"); *JggU  
  m_Number = _T("0 picture captured."); OL4z%mDZi  
  nCount=0; Y5fLmPza  
  bRegistered=FALSE; {U&.D [{&  
  bTray=FALSE; &-(463  
 //}}AFX_DATA_INIT 3u%{dGa  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z-M3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9x,RvWTb  
} ]Q[p@gLd  
jzU.Bu.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d,Y_GCZ7|W  
{ Y*mbjyt[?X  
 CDialog::DoDataExchange(pDX); pr%nbl  
 //{{AFX_DATA_MAP(CCaptureDlg) \u6^Varw  
  DDX_Control(pDX, IDC_KEY, m_Key); /}-CvSR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^vG8#A}]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6e&>rq6C  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >0Q|nCx  
  DDX_Text(pDX, IDC_PATH, m_Path); xf|mlHS+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wAnb Di{W  
 //}}AFX_DATA_MAP !w&kyW?e  
} 2^?:&1:  
v4@Z(M  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  }fp-5  
//{{AFX_MSG_MAP(CCaptureDlg) 3fN.bU9_  
 ON_WM_SYSCOMMAND() Z7 E  
 ON_WM_PAINT() 'X shmZ0&  
 ON_WM_QUERYDRAGICON() qzb<J=FAU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?%H):r  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y@PI {;!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /x3/Ubmz~x  
//}}AFX_MSG_MAP {Zp\^/  
END_MESSAGE_MAP() hYawU@R  
Ef<b~E@  
BOOL CCaptureDlg::OnInitDialog() j0@[Br%7  
{ ca+[0w@S  
 CDialog::OnInitDialog(); uZ;D!2Q a  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z=$jGL  
 ASSERT(IDM_ABOUTBOX < 0xF000); y"Nsh>h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a# c6[!   
 if (pSysMenu != NULL) `a9L%z  
 { ZE%YXG  
  CString strAboutMenu; =]k {"?j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); g2unV[()_  
  if (!strAboutMenu.IsEmpty()) =J1rlnaaEL  
  { #-h\.#s  
   pSysMenu->AppendMenu(MF_SEPARATOR); c'*a{CV4P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); T?4G'84nN  
  } /lafve~  
 } D%JlbH8  
 SetIcon(m_hIcon, TRUE); // Set big icon ?McQr1  
 SetIcon(m_hIcon, FALSE); // Set small icon PTj&3`v  
 m_Key.SetCurSel(0); 2)j0Ai%  
 RegisterHotkey(); s3W@WH^.  
 CMenu* pMenu=GetSystemMenu(FALSE); *5xJv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6Zn @2PGEl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4b:s<$TZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iOG[>u0h  
 return TRUE; // return TRUE unless you set the focus to a control ?&Pg2]g<  
} *cyeO*  
a ^%"7Ri  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @)K%2Y`  
{ s|D>-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) W\18{mbuy  
 { (ND4Q[*6  
  CAboutDlg dlgAbout; j;+?HbL  
  dlgAbout.DoModal(); Y"KE7>Jf  
 } umdG(osR  
 else 5+fLeC;  
 { s`#(   
  CDialog::OnSysCommand(nID, lParam); v!%5&: c3  
 } %Ts PyiYl  
} [CAR[ g&  
Q:$Zy  
void CCaptureDlg::OnPaint() $Y 7c  
{ UUMtyf  
 if (IsIconic()) `SVmQSwO[  
 { HI@syFaJM  
  CPaintDC dc(this); // device context for painting DLCkM*'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b"TjGE  
  // Center icon in client rectangle {aM<{_v  
  int cxIcon = GetSystemMetrics(SM_CXICON);  \lSU  
  int cyIcon = GetSystemMetrics(SM_CYICON); k^OV56  
  CRect rect; +}-@@,  
  GetClientRect(&rect); Z y_V9j[n  
  int x = (rect.Width() - cxIcon + 1) / 2; Rar"B*b;$  
  int y = (rect.Height() - cyIcon + 1) / 2; 7==f\%,  
  // Draw the icon N~F RM& x  
  dc.DrawIcon(x, y, m_hIcon); Zk[&IBE_  
 } 77Bgl4P  
 else pFJB'=c  
 { k#5}\w!  
  CDialog::OnPaint(); c5mZG7-  
 } U"50_O  
} +d|mR9^([  
?MQ.% J  
HCURSOR CCaptureDlg::OnQueryDragIcon() `l*;t`h  
{ I<A6Z&*un  
 return (HCURSOR) m_hIcon; tlA"B{7  
} gR@C0  
'ky b\q  
void CCaptureDlg::OnCancel() ~/_SMPLo  
{ pa{re,O"e  
 if(bTray) KWWa&[ev)  
  DeleteIcon(); ox ;  
  CDialog::OnCancel(); uB7 V?A  
} bb d.  
%sRUh0AL  
void CCaptureDlg::OnAbout() _@R0x#p5M  
{ (< =}]v  
 CAboutDlg dlg; ]f1{n  
 dlg.DoModal(); _.-;5M-  
} }ZqW@ -  
&Ni`e<mP  
void CCaptureDlg::OnBrowse() @UdfAyL  
{ [= |jZVhT  
 CString str; b pv= %  
 BROWSEINFO bi; ~0b O}  
 char name[MAX_PATH]; 5xOvY  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Xb QlHfrS  
 bi.hwndOwner=GetSafeHwnd(); FW.$5*f='  
 bi.pszDisplayName=name; EJ`T$JD  
 bi.lpszTitle="Select folder"; \Y}3cE  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; mZUfn%QXb(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3 LdQ]S  
 if(idl==NULL) ./$cMaDJ  
  return; fJWC)E  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); F9*g=  
 str.ReleaseBuffer(); p7H3J?`w1+  
 m_Path=str; 5cWw7V<m  
 if(str.GetAt(str.GetLength()-1)!='\\') "5A&_E }3  
  m_Path+="\\"; U w4>v:  
 UpdateData(FALSE); qn,O40/]  
} f$'2}'.!$  
S'HnBn /  
void CCaptureDlg::SaveBmp() |g3?y/l  
{ >YUoh-]`  
 CDC dc; rhL"i^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,E.' o=Z  
 CBitmap bm; ] 7 _`]7p  
 int Width=GetSystemMetrics(SM_CXSCREEN); M,5"b+mX[~  
 int Height=GetSystemMetrics(SM_CYSCREEN); b2@VxdFN  
 bm.CreateCompatibleBitmap(&dc,Width,Height); NuU9~gSQ  
 CDC tdc; lHV[Ln`\x  
 tdc.CreateCompatibleDC(&dc); ?i`l[+G  
 CBitmap*pOld=tdc.SelectObject(&bm); L_w+y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7+hK~  
 tdc.SelectObject(pOld); dZ _zg<  
 BITMAP btm; FCkf#  
 bm.GetBitmap(&btm); Y-0?a?q2Fr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g&n)fF  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); t&9A ]<n%,  
 BITMAPINFOHEADER bih; X<R?uI?L  
 bih.biBitCount=btm.bmBitsPixel; jVH|uX"M5Y  
 bih.biClrImportant=0; 0KD]j8^  
 bih.biClrUsed=0; . <tq6 1  
 bih.biCompression=0; jV8q)=}*)  
 bih.biHeight=btm.bmHeight; hkO sm6  
 bih.biPlanes=1; jP~Z`y f  
 bih.biSize=sizeof(BITMAPINFOHEADER); rS1fK1dy s  
 bih.biSizeImage=size; *Y@nVi  
 bih.biWidth=btm.bmWidth; ?3O9eZY@  
 bih.biXPelsPerMeter=0; Z;h<6[(  
 bih.biYPelsPerMeter=0; }y%oT P&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [{r}u  
 static int filecount=0; &gI~LP  
 CString name; Ssk}e=]  
 name.Format("pict%04d.bmp",filecount++); V i&*&"q  
 name=m_Path+name; 7$rjlVe  
 BITMAPFILEHEADER bfh; |X`/  
 bfh.bfReserved1=bfh.bfReserved2=0; )(7&X45,k  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7r{83_B  
 bfh.bfSize=54+size; j w* IO  
 bfh.bfOffBits=54; S"wg2X<  
 CFile bf; .Q)|vq^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /cZ-tSC)o  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cT\I[9! )  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^V|Oxp'7_  
  bf.WriteHuge(lpData,size); ;=? ~ -_  
  bf.Close(); oBUxKisW  
  nCount++; )a3IQrf=  
 } IL_d:HF|1  
 GlobalFreePtr(lpData); ;sch>2&ZWU  
 if(nCount==1) ejA%%5q  
  m_Number.Format("%d picture captured.",nCount); \cLSf=  
 else 6DZ),F,M  
  m_Number.Format("%d pictures captured.",nCount); Iyo@r%I  
  UpdateData(FALSE); H'qG/@u-l  
} =YG _z^'  
` gW<M  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mm5$> [%U  
{ vzn{h)D  
 if(pMsg -> message == WM_KEYDOWN) ,/O[=9l36R  
 { v2,%K`pAU  
  if(pMsg -> wParam == VK_ESCAPE) QKE9R-K TE  
   return TRUE; +-B^Z On  
  if(pMsg -> wParam == VK_RETURN) 6:% L![FX  
   return TRUE; 5 |/9}^T  
 } ip~$X 2  
 return CDialog::PreTranslateMessage(pMsg); KgW:@X7wvM  
} "KJ%|pg_C  
?6!]Nl1gr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dSCzx .c  
{ }oJAB1'k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ VB<Jf'NU  
  SaveBmp(); t!K*pM  
  return FALSE; +\"-P72vjk  
} gDIBnH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J1XL<7  
 CMenu pop; Db"DG(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;#MB7A  
 CMenu*pMenu=pop.GetSubMenu(0); Tg3!Rq55  
 pMenu->SetDefaultItem(ID_EXITICON); }qjCTEs}  
 CPoint pt; v_<2H' *Q  
 GetCursorPos(&pt); RwVaZJe)l  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1oKfy>ie  
 if(id==ID_EXITICON) _W3Y\cs,-  
  DeleteIcon(); $W;b{H=F  
 else if(id==ID_EXIT) @u._"/K  
  OnCancel(); *1@:'rJ  
 return FALSE; { BEo &  
} iBudmT8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gN {'UDg  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7DlOW1|  
 AddIcon(); E VQ0l@K  
 return res; tvd0R$5}  
} vEQ<A<[Z  
gw _$  
void CCaptureDlg::AddIcon() vB! |\eJ  
{ D7"p}PD>~  
 NOTIFYICONDATA data; [i]r-|_K  
 data.cbSize=sizeof(NOTIFYICONDATA); \C 5%\4  
 CString tip; dd|W@Xp -  
 tip.LoadString(IDS_ICONTIP); Iak0 [6Ey  
 data.hIcon=GetIcon(0); x7T +>  
 data.hWnd=GetSafeHwnd(); 6Fy@s  
 strcpy(data.szTip,tip); 2u?zO7W)-L  
 data.uCallbackMessage=IDM_SHELL; 1nPZ<^A&@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w{ `|N$  
 data.uID=98; X bkb5EkA  
 Shell_NotifyIcon(NIM_ADD,&data); (Vg}Hh?p  
 ShowWindow(SW_HIDE); Q)af|GW$  
 bTray=TRUE; {0!#>["<  
} OlD`uA  
X5 ITF)&  
void CCaptureDlg::DeleteIcon() ^/Sh=4=G  
{ CVXytS?@x  
 NOTIFYICONDATA data; sCl$f7"  
 data.cbSize=sizeof(NOTIFYICONDATA); =l<iI*J. M  
 data.hWnd=GetSafeHwnd(); YwH./)r=  
 data.uID=98; <Q<+4Y{R  
 Shell_NotifyIcon(NIM_DELETE,&data); >5T_g2pkv  
 ShowWindow(SW_SHOW); 9j*0D("  
 SetForegroundWindow(); N~ANjn/wL  
 ShowWindow(SW_SHOWNORMAL); +\#Fd  
 bTray=FALSE; BKU'`5`  
} a <X0e>  
u&QKwD Uh  
void CCaptureDlg::OnChange() ngi<v6i  
{ e~v(eK_  
 RegisterHotkey(); l0tYG[  
} z (c9,3  
b]gY~cbI8  
BOOL CCaptureDlg::RegisterHotkey() 8Z85D  
{ =neL}Fav56  
 UpdateData(); GJ 'spgz  
 UCHAR mask=0; 7.bN99{xPM  
 UCHAR key=0; v[<Bjs\q5  
 if(m_bControl) q;AT>" =)  
  mask|=4; P,bd'  
 if(m_bAlt)  +f4W"t  
  mask|=2; ;+pOP |P=  
 if(m_bShift) OuIv e>8  
  mask|=1; ;K:8#XuV  
  key=Key_Table[m_Key.GetCurSel()]; !PUp>(  
 if(bRegistered){ > 7`&0?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f"&Xr!b.h  
  bRegistered=FALSE; /&ygiH{^  
 } ;mAhY  
 cMask=mask; }1+%_|Y-E  
 cKey=key; DlE_W+F  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e<gx~N9l'  
 return bRegistered; GIHpSy`z  
} 'PdmI<eXQ  
'~-IV0v9  
  四、小结 h[XGC =%  
6xgv:,  
  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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