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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: rU/-Wq`B  
  [X0k{FR  
  一、实现方法 [V!^\g\6  
Ws2prh^e(  
  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:  9OrA9r  
FE$M[^1_  
#pragma data_seg("shareddata") 9$B)hrJo  
HHOOK hHook =NULL; //钩子句柄 -~QlHp&SY  
UINT nHookCount =0; //挂接的程序数目 f 3nnXE"  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A5&>!y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <) >gg!   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |[lxV&SD .  
static int KeyCount =0; KUl Zk^a  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 , V0iMq  
#pragma data_seg() (.jO:#eE%  
z{ Zimr  
  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。 T>AI0R3  
m)tI  
  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: `R4W4h'I  
z/ c'Z#w%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Y{x[N}h  
cKey,UCHAR cMask) *~\;&G29Y  
{ aufcd57  
 BOOL bAdded=FALSE; b;&Yw-\nZ;  
 for(int index=0;index<MAX_KEY;index++){ `Gy>tD.#V-  
  if(hCallWnd[index]==0){ XnNOj>!  
   hCallWnd[index]=hWnd; Z_eqM4{  
   HotKey[index]=cKey; Mt7X<?GZm  
   HotKeyMask[index]=cMask; #R"9)vHp  
   bAdded=TRUE; ]5qjK~,4b  
   KeyCount++; brp N >\  
   break; [A.eVuV;+  
  } Rx_,J%0Fq  
 } QjW~6Z.tI  
 return bAdded; *YiD B?Si  
} H4K(SGx  
//删除热键 m\R@.jkZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (o6A?37i  
{ K4K3< Pg  
 BOOL bRemoved=FALSE; -7C=- \]  
 for(int index=0;index<MAX_KEY;index++){ (AyRs7Dkn  
  if(hCallWnd[index]==hWnd){ hs -}:^S`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #U6/@l)  
    hCallWnd[index]=NULL; 93zlfLS0  
    HotKey[index]=0; DI2S %N l  
    HotKeyMask[index]=0; DcFV^8O&  
    bRemoved=TRUE; .q'FSEkMJ  
    KeyCount--; uMq\];7I  
    break; 6 ^6uK  
   } cSHtl<UY  
  } B<|q{D$N/  
 } l1`c?Y  
 return bRemoved; JY;#]'T\;  
} X~<>K/}u5  
6w .iEb  
0X}w[^f  
  DLL中的钩子函数如下: !Cv<>_N).  
[8om9 Z3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BhhK| U/  
{ .[eSKtbc)  
 BOOL bProcessed=FALSE; FHnHhB[  
 if(HC_ACTION==nCode) 6P/9Vh j'  
 { k^vmRe<lk  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 OM.(g%2  
   switch(wParam) ,rvZW}=  
   {  MZhJ,km)  
    case VK_MENU: *Kp ^al  
     MaskBits&=~ALTBIT; <T=o]M$  
     break; sV Z}nq{  
    case VK_CONTROL:  # 8-P  
     MaskBits&=~CTRLBIT; 6=[ PJM  
     break;  (t]R#2{  
    case VK_SHIFT: swe8  
     MaskBits&=~SHIFTBIT; 'DB({s  
     break;  ZeDDH  
    default: //judge the key and send message H]]>sE  
     break; H603L|4  
   } 5D q{"@E  
   for(int index=0;index<MAX_KEY;index++){ r0XGGLFuZl  
    if(hCallWnd[index]==NULL) >=RHE@  
     continue; ~A{[=v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K`AW?p^$Y  
    { ^,\se9=(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E`Zh\u)  
     bProcessed=TRUE; XQ?)  
    } W1M/Z[h6)5  
   } KTS7)2ci  
  } 4 9+}OIX  
  else if((lParam&0xc000ffff)==1){ //有键按下 c+ H)1Dfq  
   switch(wParam) n*]x02:LjZ  
   { A5 J#x6@  
    case VK_MENU: :d/:Ga5v!  
     MaskBits|=ALTBIT; <i`K%+<WO  
     break; E<.{ v\  
    case VK_CONTROL: JjL0/&  
     MaskBits|=CTRLBIT; 61 HqBa  
     break; 9#A{C!75(y  
    case VK_SHIFT: tZ6v@W  
     MaskBits|=SHIFTBIT; !&<Wc^PG  
     break; F^[Rwzv>c  
    default: //judge the key and send message Ub-k<]yZ  
     break; 9R<J$e  
   } ,HjHt\!~<  
   for(int index=0;index<MAX_KEY;index++){ /)HEx&SQmZ  
    if(hCallWnd[index]==NULL) z8MpE  
     continue; vN[m5)aT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <H(AS'  
    { # v/aI*Rl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b9!J}hto,  
     bProcessed=TRUE; #p^pvdvh3  
    } U*#E aL  
   } A 5\"e^>  
  } L?pvz}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 gcY~_'&u  
   for(int index=0;index<MAX_KEY;index++){ <GU(/S!}  
    if(hCallWnd[index]==NULL) [_z2z6  
     continue; S&g -  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) < oG\)!O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n ;fTx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @C6DOB  
   } ?%TM7Z4  
  } - &LZle&M  
 } I5 7<0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K%~Kg9  
} {s^n|b}  
So0,)  
  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: W!Os ci  
kO O~%|1CP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O#ajoE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0DjBqh$  
*xX0]{49q  
  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: X([n>w  
a}8>(jtSt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n@8{FoF  
{ e2H'uMy;&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) XT;IEZQZ  
 { 7UnO/K7oB.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v?iH}7zb%Q  
  SaveBmp(); CX(yrP6;  
  return FALSE; `E%d$  
 } x[<#mt  
 …… //其它处理及默认处理 ^.aEKr  
} oHGf |  
*v-xC5L1\  
E;*TRr><  
  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。 $+yQ48Wq  
3xR#,22:}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 H<3b+Sg  
k{$"-3ed  
  二、编程步骤 Z)>a6s$ih<  
q+=@kXs>+  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; [ Sa C  
5s2}nIe  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M;@03 x W  
yH0ZSv  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 'g, x}6  
]$%4;o4O  
  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;  E8V\J  
FKTP0e7=9  
  5、 添加代码,编译运行程序。 }Z%{QJ$z  
YV+dUvz  
三、程序代码 s%re>)=|  
*" +cP!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL T_ #oMXZ/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ."g5+xX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ faeyk]u  
#if _MSC_VER > 1000 8&iI+\lCy  
#pragma once ))-M+CA  
#endif // _MSC_VER > 1000 :re(khZq#  
#ifndef __AFXWIN_H__ (B4 A$t  
#error include 'stdafx.h' before including this file for PCH >LZ)<-Mk  
#endif 'wHkE/ 83  
#include "resource.h" // main symbols ty8!"-V1  
class CHookApp : public CWinApp JH,fg K+[  
{ G~j<I/)"  
 public: omU)hFvyS  
  CHookApp(); 6>^k9cJp  
  // Overrides m.X+sP-e  
  // ClassWizard generated virtual function overrides jtJ8r5j 1  
  //{{AFX_VIRTUAL(CHookApp) `Y$5g~3.  
 public: $6+P&"8  
  virtual BOOL InitInstance(); -s84/E4Y*  
  virtual int ExitInstance(); / 1@m#ZxA:  
  //}}AFX_VIRTUAL mh SsOmJ5  
  //{{AFX_MSG(CHookApp) vWga>IGM  
  // NOTE - the ClassWizard will add and remove member functions here. LU=)\U@Q  
  // DO NOT EDIT what you see in these blocks of generated code ! f*@:{2I.v  
  //}}AFX_MSG Z1}zf( JU  
  DECLARE_MESSAGE_MAP() ooxzM `  
}; _^A NJ7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _Pm}]Y:_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F#R\Ot,hv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  K8we*  
BOOL InitHotkey(); soCHwiE  
BOOL UnInit(); =5#Jsn?U  
#endif  ~&jCz4M  
-v2q:x'G#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ZOsn,nF  
#include "stdafx.h" ml/O  
#include "hook.h" J<O_N~$$*  
#include <windowsx.h> DN_C7\CoA  
#ifdef _DEBUG SuuS!U+i>  
#define new DEBUG_NEW RlL,eU$CS  
#undef THIS_FILE .DsYR/  
static char THIS_FILE[] = __FILE__; ^aMdbB  
#endif ~n\ea:.  
#define MAX_KEY 100 -L3RzX  
#define CTRLBIT 0x04 ^@> Qiy  
#define ALTBIT 0x02 +Ea X S  
#define SHIFTBIT 0x01 X Y?@^  
#pragma data_seg("shareddata") )o,0aGo>Of  
HHOOK hHook =NULL; @=1``z#  
UINT nHookCount =0; }Elce}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1#u w^{n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^!tI+F{n{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xz'd5 re%  
static int KeyCount =0; <5^(l$IBj  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !d )i6W?  
#pragma data_seg() ?5gpk1  
HINSTANCE hins; EF~PM  
void VerifyWindow(); pdu  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ' qVa/GJ  
//{{AFX_MSG_MAP(CHookApp) Xqw7lj;K  
// NOTE - the ClassWizard will add and remove mapping macros here. Mb!^_cS(  
// DO NOT EDIT what you see in these blocks of generated code! =hlu, By  
//}}AFX_MSG_MAP bS6Yi)p  
END_MESSAGE_MAP() s]>%_(5  
TD9`S SpP  
CHookApp::CHookApp() M] *pBc(o0  
{ GjG3aqP&!  
 // TODO: add construction code here, (o\~2e:  
 // Place all significant initialization in InitInstance )T_ #X!  
} A4x3TW?  
)UUe5H6Hd0  
CHookApp theApp; r/f;\w7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z$b!J$A1  
{ Uc2#so$9  
 BOOL bProcessed=FALSE; Z;s-t\C  
 if(HC_ACTION==nCode) g&wQ^  
 { v,B\+q/  
  if((lParam&0xc0000000)==0xc0000000){// Key up _Y=yR2O  
   switch(wParam) i|GC 'XD@  
   { ARo5 Ss{  
    case VK_MENU: q"oNB-bz  
     MaskBits&=~ALTBIT; ]^<~[QK_C  
     break; W@=ilW3RD  
    case VK_CONTROL: t T:yvU@a  
     MaskBits&=~CTRLBIT; U @|_5[nl  
     break; .|-y+9IP  
    case VK_SHIFT: G.T1rUh=  
     MaskBits&=~SHIFTBIT; !HYqM(|{.  
     break; xcA:Q`c.{  
    default: //judge the key and send message D$;/ l}s?  
     break; 2D"/k'iA  
   } O/nS,Ux  
   for(int index=0;index<MAX_KEY;index++){ nt6"}vO  
    if(hCallWnd[index]==NULL) @d|9(,Q  
     continue; m6D4J=59  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (#qVtN`t  
    { N%+M+zEJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <Z;BB)I&C`  
     bProcessed=TRUE; 70eN]OY  
    } 7(Kc9sJC%%  
   } %|>i2  
  } `314.a6S  
  else if((lParam&0xc000ffff)==1){ //Key down r.5F^   
   switch(wParam) uip]K{/A!e  
   { rg\w!L(  
    case VK_MENU: #4>F%_  
     MaskBits|=ALTBIT; `0F IJT  
     break; yM@cml6Ox  
    case VK_CONTROL: mr? ii  
     MaskBits|=CTRLBIT; \mloR '  
     break; '>BHwc  
    case VK_SHIFT: 0sa EcJ-  
     MaskBits|=SHIFTBIT; v]~[~\|a  
     break; [qB=OxH?  
    default: //judge the key and send message @$]h[   
     break; S8l+WF4q  
   } f`e.c_n(  
   for(int index=0;index<MAX_KEY;index++) >Mn.|:DF]&  
   { R0[Gfq9M =  
    if(hCallWnd[index]==NULL) oLoa71Q}  
     continue; 0P42C{>'w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5]E5V@C   
    { ?$Pj[O^hl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~m7+^c@,  
     bProcessed=TRUE; vNIQc "\-  
    } ,U}8(D~:  
   } 75y#^pD?c  
  } b%(0AL  
  if(!bProcessed){ z~qQ@u|  
   for(int index=0;index<MAX_KEY;index++){ Qw:j2g2H7  
    if(hCallWnd[index]==NULL) KMV!Hqkk  
     continue; O9Aooe4W=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \=)h6AG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r+Y1m\  
   } @Klj!2cv$  
  } mwxJ#  
 } 5|Qr"c$p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xlAaIo)T  
} `F#KXk  
SW7%SX,xM  
BOOL InitHotkey() .kVga+la?  
{ ) =[Tgh  
 if(hHook!=NULL){ 0U'r ia:$  
  nHookCount++; <,{v>vlw  
  return TRUE; R[QE:#hT  
 } rk|6!kry  
 else 0W)_5f&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); n !QjptQ  
  if(hHook!=NULL) N@}U;x}  
   nHookCount++; >:=TS"}yS}  
  return (hHook!=NULL); 2r,fF<WQ  
} 15COwc*k  
BOOL UnInit() ?4_;9MkN  
{ _[ x(p6Xp  
 if(nHookCount>1){ 8'y|cF%U  
  nHookCount--; 8Bhng;jX  
  return TRUE; 4J  s>yP  
 } r"+ WUU  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kcle|B  
 if(unhooked==TRUE){ ;1KhUf;&F  
  nHookCount=0; 3; A1[E6K  
  hHook=NULL; vzL>ZBe Z  
 } kQ +   
 return unhooked; ]zO]*d=m  
} g!$ "CX%8  
a <3oyY'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^P[*yf  
{ UxW~yk  
 BOOL bAdded=FALSE; 7 ?Fl [FW$  
 for(int index=0;index<MAX_KEY;index++){ ;.Kzc3yz}  
  if(hCallWnd[index]==0){ v[x`I;  
   hCallWnd[index]=hWnd; NoMC* ",b>  
   HotKey[index]=cKey; 2}NfR8 N  
   HotKeyMask[index]=cMask; M`(xAVl  
   bAdded=TRUE; sEoS|"  
   KeyCount++; -Jhf]  
   break; *)`:Nm~y  
  } qcK)J/K"  
 } ^/c|s!U^  
 return bAdded; U5Y*xm<  
} wdg[pt />  
1||e !W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V1ug.Jv^  
{ @wo9;DW`  
 BOOL bRemoved=FALSE; &c]x;#-y  
 for(int index=0;index<MAX_KEY;index++){ ;j$84o{  
  if(hCallWnd[index]==hWnd){  *q^'%'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m>iuy:ti  
    hCallWnd[index]=NULL; ~Sh}\&3p  
    HotKey[index]=0; '@$?A>.cj  
    HotKeyMask[index]=0; \R~Lf+q  
    bRemoved=TRUE; dgO2fI  
    KeyCount--; !o`al` q'  
    break; KT3[{lr  
   } HjK|9  
  } ^3e l-dZ  
 } O&}07(  
 return bRemoved; As"'KR  
} +/ #J]v-  
cJt#8P  
void VerifyWindow() rTi.k  
{ ^#G>P0mG%  
 for(int i=0;i<MAX_KEY;i++){  (vY10W{  
  if(hCallWnd!=NULL){ L9x,G!  
   if(!IsWindow(hCallWnd)){ Iv{}U\ u  
    hCallWnd=NULL; a@%FwfIu  
    HotKey=0; CSs3l  
    HotKeyMask=0; 2W}RXqV<  
    KeyCount--; =%a.C(0&G  
   } }%VHBkuc  
  } 1Ao"DxZHy7  
 } "MyYu}AD  
} rP*?a~<  
*6uiOtH  
BOOL CHookApp::InitInstance() Fr3Q"(  
{ qWWy}5SOm  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); C4b3ZcD2  
 hins=AfxGetInstanceHandle(); *bR _ C"-  
 InitHotkey(); FCg,p2  
 return CWinApp::InitInstance(); 0hPm,H*Y]  
} .9`.\v6R  
0py0zE6,,  
int CHookApp::ExitInstance() Sna7r~ j  
{ 2^|*M@3r  
 VerifyWindow(); g >X!Q  
 UnInit(); f1Rm9``  
 return CWinApp::ExitInstance(); RNm/&F1C$  
} _Wgg=A"G  
jML}{>Gy8S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -`rz[";n  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ](%-5G1<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~V(WD;Mk  
#if _MSC_VER > 1000 k&9 b&-=fk  
#pragma once ](^xA `  
#endif // _MSC_VER > 1000 ]E,  
=s;7T!7!  
class CCaptureDlg : public CDialog $[IuEdc/  
{ _v_ak4m>  
 // Construction +|^rz#X  
 public: 6}[W%S]8  
  BOOL bTray; gPDc6{/C<  
  BOOL bRegistered; ;0ake%v]  
  BOOL RegisterHotkey();  M7hff4c  
  UCHAR cKey; 63ht|$G  
  UCHAR cMask; RsY|V|<  
  void DeleteIcon(); y%43w4  
  void AddIcon(); b8>r UGA{  
  UINT nCount; *ozeoX'5D  
  void SaveBmp(); ZVeY`o(uE  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor la f b^  
  // Dialog Data 94H 6`  
  //{{AFX_DATA(CCaptureDlg) d'PjO-"g  
  enum { IDD = IDD_CAPTURE_DIALOG }; q4Q1Ib-<2  
  CComboBox m_Key; D(yRI  
  BOOL m_bControl; Uh*V>HA#  
  BOOL m_bAlt;  E{h   
  BOOL m_bShift; e;,D!  
  CString m_Path; 0&Zm3(}  
  CString m_Number; o4tQ9X=}  
  //}}AFX_DATA eqYa`h@g^  
  // ClassWizard generated virtual function overrides \  VJ3  
  //{{AFX_VIRTUAL(CCaptureDlg) )~rN{W<s`H  
 public: GBN^ *I  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~fEgrF d  
 protected: c}lUP(Ss  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F?TAyD*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9=Y-w s  
  //}}AFX_VIRTUAL EZao\,t  
  // Implementation .#P'NF(5#  
 protected: *uNa( yd  
  HICON m_hIcon; S$ dFz  
  // Generated message map functions Q!MS_ #O  
  //{{AFX_MSG(CCaptureDlg) YS%HZFY, "  
  virtual BOOL OnInitDialog(); gTm[<Y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a3JG&6-  
  afx_msg void OnPaint(); !fjDO!,!  
  afx_msg HCURSOR OnQueryDragIcon(); Kh}#At^C8e  
  virtual void OnCancel(); 5^*I]5t8  
  afx_msg void OnAbout(); Y@F@k(lOo  
  afx_msg void OnBrowse(); mZ'`XAS~;  
  afx_msg void OnChange(); *RivZ c9;P  
 //}}AFX_MSG (;V6L{Rf>  
 DECLARE_MESSAGE_MAP() Ac|IBXGa=  
}; &")ON[|b  
#endif 2{% U\^-  
WL+I)n8~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pvD\E  
#include "stdafx.h" d A[I  
#include "Capture.h" hgLwxJu  
#include "CaptureDlg.h" W/L~&.'  
#include <windowsx.h> V'^Hn?1^  
#pragma comment(lib,"hook.lib") D!+d]A[r  
#ifdef _DEBUG .sgP3Ah  
#define new DEBUG_NEW .e~17}Ka}  
#undef THIS_FILE V`m'r+ Y  
static char THIS_FILE[] = __FILE__; =Z2Cg{z  
#endif ?V3e;n  
#define IDM_SHELL WM_USER+1 d@JjqE[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FQ2 6(.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a^>0XXr}Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; TDq(%IW  
class CAboutDlg : public CDialog Z`Rrv$M!  
{ Nyip]VwMJ  
 public: uPQ:}zL2  
  CAboutDlg(); ^giseWR(  
  // Dialog Data '1_CMr  
  //{{AFX_DATA(CAboutDlg) $OldHe[p  
  enum { IDD = IDD_ABOUTBOX }; gDa}8!+i  
  //}}AFX_DATA =`Pgo5A  
  // ClassWizard generated virtual function overrides sEm-Td+A5  
  //{{AFX_VIRTUAL(CAboutDlg) mfc\w'  
 protected: pa*bqPi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3dTz$s/[  
  //}}AFX_VIRTUAL 8m\* ~IX=  
  // Implementation DY/xBwIF  
 protected: +`>Tuz~  
  //{{AFX_MSG(CAboutDlg) \]1qAFB5  
  //}}AFX_MSG T%B&HsH  
  DECLARE_MESSAGE_MAP() #`?B:  
}; 7VduewKX8  
slaYr`u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,4M7:=gf  
{ Nr8#/H2f  
 //{{AFX_DATA_INIT(CAboutDlg) ^}fc]ovV  
 //}}AFX_DATA_INIT CB]#`|f  
} ^{lcj  
Ii FeO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PUZH[-:c  
{ NitsUg@<  
 CDialog::DoDataExchange(pDX); Cdg/wRje  
 //{{AFX_DATA_MAP(CAboutDlg) e:D8.h+ &}  
 //}}AFX_DATA_MAP *")Req  
} [|.IXdJ!  
=bgzl=A`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _FR_6*C)5  
 //{{AFX_MSG_MAP(CAboutDlg) 6}4?, r  
 // No message handlers 3}~.#`QeY  
 //}}AFX_MSG_MAP wr I66R}@  
END_MESSAGE_MAP() uj;tmK>;  
cBZ$$$v\#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) pY]T3 2  
: CDialog(CCaptureDlg::IDD, pParent) 9K,PT.c  
{ kCRfO}wt3  
 //{{AFX_DATA_INIT(CCaptureDlg) .^ djt  
  m_bControl = FALSE; &8$Gy u  
  m_bAlt = FALSE; A{X:p3$eN  
  m_bShift = FALSE; blyU5 3g  
  m_Path = _T("c:\\"); 0P i+ (X  
  m_Number = _T("0 picture captured."); [}:;B$,  
  nCount=0; ynY(  
  bRegistered=FALSE; >J(._K  
  bTray=FALSE; ?i'N 9 /(  
 //}}AFX_DATA_INIT F#NuZ'U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 t$~CLq5ad  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NhJ]X cfP8  
} rMr:\M]t  
j}u b  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I(m*%>  
{ I[nSf]Vm>  
 CDialog::DoDataExchange(pDX); !y_4.&C{  
 //{{AFX_DATA_MAP(CCaptureDlg) x9\z^GU%H  
  DDX_Control(pDX, IDC_KEY, m_Key); eLFxGZZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u|(;SY  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !r^fX=X>'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [~_)]"pU  
  DDX_Text(pDX, IDC_PATH, m_Path); .Nk'yow  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7]sRHX0o%  
 //}}AFX_DATA_MAP JX!z,X?r4  
} &FrUj>i  
1?I_fA}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0MpZdJ  
//{{AFX_MSG_MAP(CCaptureDlg) =)b!M^=X-a  
 ON_WM_SYSCOMMAND() @~7y\G  
 ON_WM_PAINT() =1#obB  
 ON_WM_QUERYDRAGICON() m4\e `nl  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D *=.;Rq  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yK+1C68A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 'k'"+  
//}}AFX_MSG_MAP t?Ku6Z'  
END_MESSAGE_MAP() Dxvizd>VU  
1FA:"0lO  
BOOL CCaptureDlg::OnInitDialog() KpX1GrIn3  
{ s#cb wDT  
 CDialog::OnInitDialog(); ==#mlpi`S[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u~c75Mk_v  
 ASSERT(IDM_ABOUTBOX < 0xF000); kF]sy8u]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G]v BI=  
 if (pSysMenu != NULL) UpTVLx^c  
 { )x5t']w`K  
  CString strAboutMenu; 4yK{(!&i+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +L0Jje>Az  
  if (!strAboutMenu.IsEmpty()) f/PqkHF  
  { PPAcEXsIu  
   pSysMenu->AppendMenu(MF_SEPARATOR); mP*Ct6628n  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); NI  r"i2  
  } (zr2b  
 } =0t<:-?.-  
 SetIcon(m_hIcon, TRUE); // Set big icon %fuV]  
 SetIcon(m_hIcon, FALSE); // Set small icon 3QI.|;X  
 m_Key.SetCurSel(0); Llf#g#T  
 RegisterHotkey(); 1S+lHG92I  
 CMenu* pMenu=GetSystemMenu(FALSE); JIc(hRf9>  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); O,PTY^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P+L#p(K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0?o<cC1Z  
 return TRUE; // return TRUE unless you set the focus to a control +lplQh@RB  
} sEymwpm9  
YMn*i<m  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gp+aUK~o  
{ ^]5^p9Jt"e  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k3+LP7|*  
 { 0gRm LX  
  CAboutDlg dlgAbout; 1'B&e)  
  dlgAbout.DoModal(); )TfX}  
 } 70<{tjyc  
 else , Dab(  
 { t i&!_  
  CDialog::OnSysCommand(nID, lParam); "T@9#7Obu  
 } K+\2cf?bU  
} dL]wu! wE  
CzDV^Iv;Q{  
void CCaptureDlg::OnPaint() ;&dMtYb  
{ ~_SRcM{  
 if (IsIconic()) V]Rt[l]  
 { |b4f3n  
  CPaintDC dc(this); // device context for painting Skg}/Ek  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~KQiNkA\|l  
  // Center icon in client rectangle S3UJ)@ E  
  int cxIcon = GetSystemMetrics(SM_CXICON); u!-v1O^[  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4L bll%[9  
  CRect rect; XL7||9,(h  
  GetClientRect(&rect); '=0l{hv@  
  int x = (rect.Width() - cxIcon + 1) / 2; R=2"5Hy=  
  int y = (rect.Height() - cyIcon + 1) / 2; esM r@Oc  
  // Draw the icon L1#_  
  dc.DrawIcon(x, y, m_hIcon); s:K'I7_#@  
 } JU#m?4g  
 else 'gtcy  
 { _WR/]1R  
  CDialog::OnPaint(); "m%EFWUOl  
 } UHgW-N"  
} Pcjrv:0$  
T65"?=<EB  
HCURSOR CCaptureDlg::OnQueryDragIcon() |~o0 -: 'C  
{ I!#WXK  
 return (HCURSOR) m_hIcon; V x{   
} O\SH;y,N  
m3~_uc/+D  
void CCaptureDlg::OnCancel() O"X:3srJ`  
{ M._;3_)%/  
 if(bTray) T/FZn{I  
  DeleteIcon(); T>pyYF1Q  
  CDialog::OnCancel(); U.WXh(`%  
} /}/GK|tj  
BNgm+1?L  
void CCaptureDlg::OnAbout() U[?f@.&  
{ $ V !25jQ  
 CAboutDlg dlg; N!fjN >cw  
 dlg.DoModal(); R^mkQb>m.  
} DheQcM  
6RG63+G  
void CCaptureDlg::OnBrowse() ,^7] F"5  
{ VsJKxa4  
 CString str; ==UYjbuU  
 BROWSEINFO bi; p~NHf\  
 char name[MAX_PATH]; ][KlEE>W2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); O^PN{u  
 bi.hwndOwner=GetSafeHwnd(); _e/Bg~  
 bi.pszDisplayName=name; { 1_ <\ ~J  
 bi.lpszTitle="Select folder"; n.i 8?:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; .SLpgYFL{  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); l3*GQ~m7  
 if(idl==NULL) l<p<\,nV$  
  return; l-P6B9e|\  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5KfrkZ  
 str.ReleaseBuffer(); Dlpmm2  
 m_Path=str; G3 |x%/Fbp  
 if(str.GetAt(str.GetLength()-1)!='\\') UM`{V5NG#  
  m_Path+="\\"; *$5p,m6G  
 UpdateData(FALSE); /+*N.D'`t,  
} r\cY R}v  
9Z }<H/q  
void CCaptureDlg::SaveBmp() t(dVd%   
{ R={#V8D~  
 CDC dc; 6$0<&')Yb  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OwEu S#-  
 CBitmap bm; tJ7F.}\;C  
 int Width=GetSystemMetrics(SM_CXSCREEN); #.!#"8{0_  
 int Height=GetSystemMetrics(SM_CYSCREEN); UCXRF  
 bm.CreateCompatibleBitmap(&dc,Width,Height); xHqF_10S#  
 CDC tdc; fs:yx'mxV  
 tdc.CreateCompatibleDC(&dc); ?pcbso  
 CBitmap*pOld=tdc.SelectObject(&bm); N:CQ$7T{ j  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *dxm|F98  
 tdc.SelectObject(pOld); %% /8B  
 BITMAP btm; 8;L;R ~Q  
 bm.GetBitmap(&btm); PxQQfI>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,"KfZf;?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); '9=b@SaAj  
 BITMAPINFOHEADER bih; \#xq$ygg  
 bih.biBitCount=btm.bmBitsPixel; a]P w:lT  
 bih.biClrImportant=0; h@Jg9AM  
 bih.biClrUsed=0; *u:,@io7'G  
 bih.biCompression=0; OrYN-A4{  
 bih.biHeight=btm.bmHeight; 97U OH  
 bih.biPlanes=1; Hq+QsplG  
 bih.biSize=sizeof(BITMAPINFOHEADER); d3|/&gDBK  
 bih.biSizeImage=size; (w{T[~6  
 bih.biWidth=btm.bmWidth; j!y9E~Zz  
 bih.biXPelsPerMeter=0; :p,|6~b$  
 bih.biYPelsPerMeter=0; IuT)?S7O*k  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;c>"gW8  
 static int filecount=0; .k-6LR  
 CString name; 5eE\ X /  
 name.Format("pict%04d.bmp",filecount++); o2=):2x r{  
 name=m_Path+name; 8sU5MQ5  
 BITMAPFILEHEADER bfh; gS'7:UH,  
 bfh.bfReserved1=bfh.bfReserved2=0; >~Xe` }'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); '`|j{mBhG  
 bfh.bfSize=54+size; Ov<c1y;f  
 bfh.bfOffBits=54; 'l=>H#}<B  
 CFile bf; $8i`h}AM  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R<Mc+{*>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %8 D>aS U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 39hep8+  
  bf.WriteHuge(lpData,size); ^N[ Cip}8  
  bf.Close(); LT Pr8^  
  nCount++; hRRxOr#*$  
 } m[^ )Q9o}  
 GlobalFreePtr(lpData); .d}yQ#5z  
 if(nCount==1) 4sntSlz)~k  
  m_Number.Format("%d picture captured.",nCount); 2$kB^g!:o  
 else bhGRD{=  
  m_Number.Format("%d pictures captured.",nCount); _/z_ X  
  UpdateData(FALSE); &6C]| 13;  
} rdd-W>+  
~nhO*bs}7{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j~1K(=Ng  
{ < K!r\^  
 if(pMsg -> message == WM_KEYDOWN) c+E\e]{  
 { T7 "QwA  
  if(pMsg -> wParam == VK_ESCAPE) k2$pcR,WM  
   return TRUE; E0Q6Ryn  
  if(pMsg -> wParam == VK_RETURN) auc:|?H~1n  
   return TRUE; R6BbkYWrX  
 } Wh..QVv  
 return CDialog::PreTranslateMessage(pMsg); b@&uwSv  
} R.*;] R>M  
<W!nlh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2I}+AW!!=  
{ ,*U-o}{8C?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]W$G!(3A  
  SaveBmp(); D4@?>ek6U  
  return FALSE; rh1PpsSc  
} 0?8>{!I  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _hyqHvP  
 CMenu pop; -&`_bf%M  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E b:iym0  
 CMenu*pMenu=pop.GetSubMenu(0); i+mU(/l2{  
 pMenu->SetDefaultItem(ID_EXITICON); |9%~z0  
 CPoint pt; c5$DHT @N"  
 GetCursorPos(&pt); (J%4}Dm  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ] 1pIIX}  
 if(id==ID_EXITICON) V\x'w*FP  
  DeleteIcon(); 1t^y?<)  
 else if(id==ID_EXIT) ?k4Hk$V  
  OnCancel(); dp^PiyL  
 return FALSE; gJr)z7W'8  
} )W 5g-@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t`E5bWG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]o]`X$n  
 AddIcon(); JyTETf,y  
 return res; Ewp2 1  
} zHz>Gc  
"hI"4xSg  
void CCaptureDlg::AddIcon() K"XwSZ/  
{ 2<5LQr  
 NOTIFYICONDATA data; G gA:;f46  
 data.cbSize=sizeof(NOTIFYICONDATA); X!LiekU!D  
 CString tip; WN{8gL&y  
 tip.LoadString(IDS_ICONTIP); ;Us6:}s  
 data.hIcon=GetIcon(0); ?i0+h7 =6  
 data.hWnd=GetSafeHwnd(); DJgM>&Y6,  
 strcpy(data.szTip,tip); `Wjq$*  
 data.uCallbackMessage=IDM_SHELL; C(v'7H{4cW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #K:iB*  
 data.uID=98; QxLrpM"O  
 Shell_NotifyIcon(NIM_ADD,&data); Yb 5@W/'  
 ShowWindow(SW_HIDE); )cRHt:  
 bTray=TRUE; :FC)+OmJ  
} hNZ_= <D!  
53:u6bb;  
void CCaptureDlg::DeleteIcon() !PGCoI  
{ { CR`~)v&  
 NOTIFYICONDATA data; ,"`3N2!Y}  
 data.cbSize=sizeof(NOTIFYICONDATA); \mGb|aF8  
 data.hWnd=GetSafeHwnd(); [dP<A ?s  
 data.uID=98; ]Xnar:5  
 Shell_NotifyIcon(NIM_DELETE,&data); ;kZD>G8  
 ShowWindow(SW_SHOW); u`Nrg<  
 SetForegroundWindow(); sj&(O@~R  
 ShowWindow(SW_SHOWNORMAL); r+[g.`  
 bTray=FALSE; K/C}  
} okRt^qe  
uKXU.u*C  
void CCaptureDlg::OnChange()  +qj Z;5(  
{ *!"T^4DEg  
 RegisterHotkey(); > `eo0  
} faLfdUimJ  
Q+K]:c  
BOOL CCaptureDlg::RegisterHotkey() 85io %>&0  
{ 9-m_ e=jk6  
 UpdateData(); /G7^l>pa  
 UCHAR mask=0; y@*4*46v  
 UCHAR key=0; i: UN  
 if(m_bControl) UdkNb}L  
  mask|=4; rtvLLOIO  
 if(m_bAlt) |>j^$^l~  
  mask|=2; ;WN% tI)  
 if(m_bShift) gsQn@(;  
  mask|=1; [7DU0Xg7  
  key=Key_Table[m_Key.GetCurSel()]; W3\+51P  
 if(bRegistered){ A ;`[va  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); CpN*1s})d  
  bRegistered=FALSE; g=4P-i3   
 } `O3#/1+  
 cMask=mask; Q_,!(N  
 cKey=key; L!33`xef'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8cY5:plK  
 return bRegistered; K[noW  
} K6B6@  
s!YX<V  
  四、小结 7SkW!5  
,:}VbQ:3I  
  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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