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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: 2;h+;G  
  _E (x2BS?  
  一、实现方法 P]- #wz=S  
Y=|CPE%V  
  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: w#rVSSXQ3  
:U8k|,~f  
#pragma data_seg("shareddata") }Wqtip:L  
HHOOK hHook =NULL; //钩子句柄 n@_)fFD%  
UINT nHookCount =0; //挂接的程序数目 IOS^|2:,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 G-ZhGbAI7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N-xnenci  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey eZ A6D\  
static int KeyCount =0; q6Rw4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 d&?F#$>7|  
#pragma data_seg() \D ^7Z97  
moe/cO5a9  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ) u-ns5  
;)P5#S!n-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: "5 y<G:$+~  
Zq^^|[)bA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR C&e8a9*,(a  
cKey,UCHAR cMask) ?o8a_9+  
{ 3+j^E6@  
 BOOL bAdded=FALSE; >ks3WMm  
 for(int index=0;index<MAX_KEY;index++){ dt0T t  
  if(hCallWnd[index]==0){ +~:x}QwGT  
   hCallWnd[index]=hWnd; n}f3Vrl  
   HotKey[index]=cKey; `{Hb2 }L5  
   HotKeyMask[index]=cMask; E~}[+X@  
   bAdded=TRUE; K(' 9l& A  
   KeyCount++; vWuyft*  
   break; y]w )`}Ax  
  } r<v_CFJ  
 } o;E (Kj  
 return bAdded; =m7CJc  
} uRFNfX(*  
//删除热键 8cB=}XgYS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *XHj)DC;  
{ 50COL66:7  
 BOOL bRemoved=FALSE; J#+Op/mmo  
 for(int index=0;index<MAX_KEY;index++){ *Q0lC1GQ  
  if(hCallWnd[index]==hWnd){ sFCf\y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K[n<+e;G  
    hCallWnd[index]=NULL; \Ec X!aC  
    HotKey[index]=0; ~R)1nN|  
    HotKeyMask[index]=0; =1eV   
    bRemoved=TRUE; G}Gb|sD Zq  
    KeyCount--; UC.8DaIPN  
    break; DhHtz.6  
   } N-Qu/,~+  
  } x4@MO|C  
 } Cy]"  
 return bRemoved; . c#90RP  
} Oxpo6G  
58 kv#;j  
2lF WW(  
  DLL中的钩子函数如下: aD0Q0C+  
n&(3o6i'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0= 2H9v  
{ IcRM4Ib))Q  
 BOOL bProcessed=FALSE; 87R%ke  
 if(HC_ACTION==nCode) e#K rgUG  
 { =7#u+*Yr9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 W31LNysH!;  
   switch(wParam) BEFe~* ~  
   {   PE^eP}O1  
    case VK_MENU: 9+W!k^VWq  
     MaskBits&=~ALTBIT; RzMA\r;#  
     break; X #&(~1O  
    case VK_CONTROL: y|$vtD%c  
     MaskBits&=~CTRLBIT; m9 ^m  
     break; SlR7h$r'  
    case VK_SHIFT: ?56~yQF/2  
     MaskBits&=~SHIFTBIT; |C^ c0  
     break; ^tQPJ  
    default: //judge the key and send message cPV5^9\T  
     break; N|bPhssFw  
   } r4;^c}  
   for(int index=0;index<MAX_KEY;index++){ "0!~g/X`rK  
    if(hCallWnd[index]==NULL) dBsRm{aS  
     continue; *sjj"^'=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HI}pX{.\  
    { Z3OZPxm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,xm;JXJ  
     bProcessed=TRUE; )-MA!\=<  
    } }_Tt1iai*  
   } b0!*mrF]6  
  } U f=vs(  
  else if((lParam&0xc000ffff)==1){ //有键按下 3| GNi~  
   switch(wParam) ,w,ENU0~f  
   { ^qE<yn  
    case VK_MENU: ' #;,oX~5  
     MaskBits|=ALTBIT; [Od>NO,n+]  
     break; vx({N?  
    case VK_CONTROL: d4b 9rtM  
     MaskBits|=CTRLBIT; #9URVq,  
     break; v(i1Z}*b  
    case VK_SHIFT: MtMvpHk  
     MaskBits|=SHIFTBIT; .CIbpV?T  
     break; 3L'en  
    default: //judge the key and send message >lUBt5gU  
     break; n$XMsl.>  
   } 1EKcD^U,  
   for(int index=0;index<MAX_KEY;index++){ yg]suU<z]  
    if(hCallWnd[index]==NULL) 53g8T+`\(  
     continue; >xhd[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dt`9RB$  
    { \] tq7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <1;,B%_^  
     bProcessed=TRUE; MzBfHt'Rk  
    } 9^6|ta0;0  
   } GN"M:L ^k`  
  } 6ON  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Z"teZ0H  
   for(int index=0;index<MAX_KEY;index++){ o[5=S,'  
    if(hCallWnd[index]==NULL) @2x0V]AI  
     continue; =NVZ$KOZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fvAh?<Ul  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [lDt0l5^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 M=" WUe_  
   } > gA %MT  
  } )R [@G.  
 } q/W{PBb-2k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hP'~  
} \'\N"g`Fr  
*7:u-}c!  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: [TiT ff&LV  
w>H%[\Qs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); / K2.V@T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M"$jpBN*  
8GF[)z&|P:  
  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: -s?dzX  
>/ *?4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Zztt)/6*  
{ pq/ FLYiv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Thht_3_C,f  
 { v*C+U$_3\1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lx A<iQia  
  SaveBmp(); S0Rf>Eo4  
  return FALSE; 7?n* t  
 } (hRgYwUa<  
 …… //其它处理及默认处理 89:?.'  
} mVc'%cPaw  
{2'74  
} kh/mq  
  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。 +O.&64(  
Egjk^:@  
  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。 iOX4Kl  
886 ('  
  二、编程步骤 {WM&  
3isXgp8  
  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"; wB1-|= K1  
bJG!)3cx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; b]tA2~e  
n]6}yJJo  
  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; @4 Os?_gJ\  
-N-4l  
  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; ul z\x2[Pf  
clR?< LO  
  5、 添加代码,编译运行程序。 aOAwezfYR  
5CRc]Q #@  
三、程序代码 &2<&X( )  
HwV gT"  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL WacU@L $A  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) KL:6P-3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ c4qp3B_w  
#if _MSC_VER > 1000 M'>D[5;N~  
#pragma once \M'bY:  
#endif // _MSC_VER > 1000 V{AH\IV-  
#ifndef __AFXWIN_H__ x[.z"$T@  
#error include 'stdafx.h' before including this file for PCH r[UyI3(i^  
#endif b. %B;qB  
#include "resource.h" // main symbols @kCD.  
class CHookApp : public CWinApp f!uA$uL c  
{ 0T{c:m~QXe  
 public: {'=Nb 5F  
  CHookApp(); CL<KBmW7  
  // Overrides =?`y(k4a  
  // ClassWizard generated virtual function overrides  n_xa)  
  //{{AFX_VIRTUAL(CHookApp) ^NnU gj  
 public: \/x)BE,  
  virtual BOOL InitInstance(); #0YzPMV  
  virtual int ExitInstance(); jV|$? Rcl%  
  //}}AFX_VIRTUAL t7*H8  
  //{{AFX_MSG(CHookApp) ]` &[Se d  
  // NOTE - the ClassWizard will add and remove member functions here. "[".3V  
  // DO NOT EDIT what you see in these blocks of generated code ! Vx7Dl{?{'  
  //}}AFX_MSG :}3qZX  
  DECLARE_MESSAGE_MAP() B;D:9K  
}; /F8\%l+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); dx?njR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0imqj7L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VT.{[Kl  
BOOL InitHotkey(); Ae{4AZ  
BOOL UnInit(); Z 9 q{r s  
#endif qqom$H<  
Vf,~MG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (fk, 80  
#include "stdafx.h" L9unhx  
#include "hook.h" ) R a/  
#include <windowsx.h> RwE*0 T  
#ifdef _DEBUG Cf1wM:K|8  
#define new DEBUG_NEW SFk11  
#undef THIS_FILE `9Q,=D+  
static char THIS_FILE[] = __FILE__; \Zz= 4 j  
#endif 8a$jO+UvN  
#define MAX_KEY 100 {GH`V}Ob  
#define CTRLBIT 0x04 7L~ zI>2  
#define ALTBIT 0x02 sKG~<8M}  
#define SHIFTBIT 0x01 i37a}.;  
#pragma data_seg("shareddata") ]stLC; nI  
HHOOK hHook =NULL; g`5`KU|  
UINT nHookCount =0; Uc4 L|:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey GZhfA ;O,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d;jJe0pH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zhvk%Y:  
static int KeyCount =0; TLL[F;uZ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6t mNfI34  
#pragma data_seg() Eztz ~oFo  
HINSTANCE hins; E_gDwWot  
void VerifyWindow(); LN3dp?;_{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) divZJc  
//{{AFX_MSG_MAP(CHookApp) #u2&8-Gh  
// NOTE - the ClassWizard will add and remove mapping macros here. .jGsO0  
// DO NOT EDIT what you see in these blocks of generated code! |<Dx  
//}}AFX_MSG_MAP <}Wy;!L  
END_MESSAGE_MAP() !wR{Y[Yu  
.L(j@I t  
CHookApp::CHookApp() 18w^7!F?~u  
{ g7}z &S ;_  
 // TODO: add construction code here, SeJFZ0p  
 // Place all significant initialization in InitInstance k4AE`[UE  
} [TfV2j* e  
8.3_Wb(c  
CHookApp theApp; : $52Ds!i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I9G*iu=U   
{ /&!d  
 BOOL bProcessed=FALSE; ZEyGqCf3  
 if(HC_ACTION==nCode) R#Nd|f<  
 { oQjB&0k4  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1PTu3o&3  
   switch(wParam) ~ GT\RAj[  
   { qxcBj  
    case VK_MENU: Y/ac}q  
     MaskBits&=~ALTBIT; 7pI \`*7b  
     break; LX?r=_\  
    case VK_CONTROL: 0*:hm%g  
     MaskBits&=~CTRLBIT; }v$=mLy  
     break; eN?P) ,  
    case VK_SHIFT: UE#Ni 5  
     MaskBits&=~SHIFTBIT; aaD$'Y,<>B  
     break; JQh s=Xg  
    default: //judge the key and send message Jx ;"a\KD  
     break; ):\{n8~  
   } RWPd S  
   for(int index=0;index<MAX_KEY;index++){ Ho._&az9cT  
    if(hCallWnd[index]==NULL) *I1W+W`G  
     continue; 5NvyK[w]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z2j*%/  
    { 0S5C7df  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _} 9R}  
     bProcessed=TRUE; >=W#z  
    } JO^ [@  
   } ^Er`{|o6u  
  } oY6|h3T=Q$  
  else if((lParam&0xc000ffff)==1){ //Key down NUnc"@  
   switch(wParam) @)'@LF1Z  
   { <VxpMF  
    case VK_MENU:  nIDsCu=A  
     MaskBits|=ALTBIT; _NqT8C4C  
     break; *_K-T#  
    case VK_CONTROL: GuY5 % wr  
     MaskBits|=CTRLBIT; <w2NJ ~M^  
     break; 6.7 Kp  
    case VK_SHIFT: |{LaZXU&  
     MaskBits|=SHIFTBIT; XM@i|AK M0  
     break; P$ dgO  
    default: //judge the key and send message Z *<x  
     break;  aC }1]7  
   } m#K%dR  
   for(int index=0;index<MAX_KEY;index++) I \%Lb z  
   { >h( rd1  
    if(hCallWnd[index]==NULL) `FB?cPR  
     continue; C<@1H>S4_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qp.!U~  
    { sPTUGx'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a<"& RnG(  
     bProcessed=TRUE; ?_j6})2zY  
    } p}zk&`  
   } sCCr%r]zL  
  } vrnj}f[h  
  if(!bProcessed){ 7>@/*S{X  
   for(int index=0;index<MAX_KEY;index++){ t\bxd`,  
    if(hCallWnd[index]==NULL) m;+1;B  
     continue; OmjT`,/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =yhfL2`aw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]9< 9F ?  
   } UpseU8Wo  
  } [,$mpJCI  
 } K}/`YDu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WJ8vHPSM  
} +Y]*>afG  
*`pBQZn05O  
BOOL InitHotkey() la{uJ9Iw@}  
{ +siNU#!  
 if(hHook!=NULL){ ` "":   
  nHookCount++; St&HE:  
  return TRUE; _v=WjN  
 } |b~g^4  
 else }J'w z;t1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); y* Q-4_%,  
  if(hHook!=NULL) la|l9N^,  
   nHookCount++; ?[/,*Q%  
  return (hHook!=NULL); H1qw1[%0y  
} I5OH=,y`  
BOOL UnInit() Dlf=N$BL7d  
{ 5 ^J8<s@_  
 if(nHookCount>1){ 5qfKV&D  
  nHookCount--; 9l_?n@   
  return TRUE; (C|V-}/*m  
 } ?F!J@Xn5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5N+(Gv[`"  
 if(unhooked==TRUE){ F8;4Oj  
  nHookCount=0; s^R2jueR  
  hHook=NULL; XTaWd0Y  
 } RW[<e   
 return unhooked; \0T*msYQ  
} H08YM P>dc  
iSLf:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #&KE_ n  
{ )mVYqlU"  
 BOOL bAdded=FALSE; (Ha}xwA~(  
 for(int index=0;index<MAX_KEY;index++){ c!wB'~MS#  
  if(hCallWnd[index]==0){ ! e,(Zz5  
   hCallWnd[index]=hWnd; s:F+bG}|  
   HotKey[index]=cKey; WvzvGT=  
   HotKeyMask[index]=cMask; QGG(I7{-  
   bAdded=TRUE; 3CuoB b8  
   KeyCount++; @wJa33QT  
   break; #|h8u`  
  } pdqa)>$  
 } aMg f6veM  
 return bAdded; J$*["y`+  
} `2,_"9Z(  
*LdH/C.LIf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rB|:r\Z(jG  
{ vm}.gQ  
 BOOL bRemoved=FALSE; 8vo7~6yy  
 for(int index=0;index<MAX_KEY;index++){ |RXC;zt9s  
  if(hCallWnd[index]==hWnd){ l^?A8jG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >Mw =}g@P  
    hCallWnd[index]=NULL; #f;1f8yrN  
    HotKey[index]=0; > BCX%<&  
    HotKeyMask[index]=0;  grA L4  
    bRemoved=TRUE; W%Q>< 'c  
    KeyCount--; >Nl~"J|]q  
    break; >M85xjXP  
   } 7gmMqz"z(>  
  } *`'%tp"'+  
 } ,8 ?*U]}  
 return bRemoved; &?sjeC_  
} usf(U>  
=C1Qo#QQ%  
void VerifyWindow() ([o:_5/8I  
{ ]=<@G.[=  
 for(int i=0;i<MAX_KEY;i++){ vg1s5Y qk  
  if(hCallWnd!=NULL){ _!1c.[ \T  
   if(!IsWindow(hCallWnd)){ y+R$pzX  
    hCallWnd=NULL; %~XJwy-  
    HotKey=0; z4:09!o_  
    HotKeyMask=0; pvxqeC9`  
    KeyCount--; W?Abx  
   } ?+o7Y1 k,  
  } -3U} (cZ*  
 } 7B"aFnK;[J  
} )WJI=jl  
)3 ">%1R  
BOOL CHookApp::InitInstance() lfd{O7L0b  
{ Ap18qp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [/j-d  
 hins=AfxGetInstanceHandle(); GQxJ (f  
 InitHotkey(); 0Hf-~6  
 return CWinApp::InitInstance(); 481u1  
} PP|xIAc  
$& gidz/w  
int CHookApp::ExitInstance() Gfch|Q^INy  
{ !`E2O*g  
 VerifyWindow(); '-TFrNO;h  
 UnInit(); o|E(_ Y4d  
 return CWinApp::ExitInstance(); Kx!|4ya,  
} scwlW b<N  
s_kd@?=`x  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !gQ(1u|r  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hmk5 1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  :Xr3 3  
#if _MSC_VER > 1000 74wa  
#pragma once ,kuOaaV7K  
#endif // _MSC_VER > 1000 (XWs4R.mkb  
(I g *iJ%2  
class CCaptureDlg : public CDialog 1&nrZG9  
{ * OFT)S  
 // Construction m':m`,c!  
 public: -8e tH&  
  BOOL bTray; T8 /'`s  
  BOOL bRegistered; 9j9?;3;  
  BOOL RegisterHotkey(); C,.{y`s'  
  UCHAR cKey; oD`BX  
  UCHAR cMask; Yy1Pipv  
  void DeleteIcon(); ||NCVGJG  
  void AddIcon(); C.p*mO&N  
  UINT nCount; w=2 X[V}  
  void SaveBmp(); ]TN}` ]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q&{5.}L  
  // Dialog Data {'C74s  
  //{{AFX_DATA(CCaptureDlg) cn{l %6K  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gl9a5b  
  CComboBox m_Key; "$9ZkADO  
  BOOL m_bControl; .<hv &t  
  BOOL m_bAlt; ZH :X 4!  
  BOOL m_bShift; UQr+\ u  
  CString m_Path; I !~Omr@P  
  CString m_Number; 6h8NrjX  
  //}}AFX_DATA AlV2tffY^  
  // ClassWizard generated virtual function overrides VQ`O;n6/`  
  //{{AFX_VIRTUAL(CCaptureDlg) _~"3 LB  
 public: ?Kf@/jv  
  virtual BOOL PreTranslateMessage(MSG* pMsg); aS 2 Y6  
 protected: _: x$"i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support " WL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _bsfM;u.%  
  //}}AFX_VIRTUAL H8U*oLlc  
  // Implementation x$sQ .aT  
 protected: w"J(sVy4  
  HICON m_hIcon; ~coG8r"o  
  // Generated message map functions d~%Rnic6*  
  //{{AFX_MSG(CCaptureDlg) af{K4:I  
  virtual BOOL OnInitDialog(); 1Btf)y'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qI:wm=  
  afx_msg void OnPaint(); ,B><la87  
  afx_msg HCURSOR OnQueryDragIcon(); Ho|n\7$  
  virtual void OnCancel(); uqH ;1T;s  
  afx_msg void OnAbout(); un=)k;oh  
  afx_msg void OnBrowse(); K`3cH6"L6  
  afx_msg void OnChange(); Zx0c6d!B  
 //}}AFX_MSG 4mg&H0 !  
 DECLARE_MESSAGE_MAP() xa:P(x3[  
}; >[U$n.  
#endif  t&]IgF  
~ME=!;<_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [g_@<?zg  
#include "stdafx.h" ] 2'~e,"O  
#include "Capture.h" TB\CSXb  
#include "CaptureDlg.h" .X9^A,9  
#include <windowsx.h> 3ji#"cX  
#pragma comment(lib,"hook.lib") !JA63  
#ifdef _DEBUG 5+J/Qm8{bb  
#define new DEBUG_NEW DJ.Ct4  
#undef THIS_FILE g(Nf.hko  
static char THIS_FILE[] = __FILE__; ^4:= b  
#endif usi p>y  
#define IDM_SHELL WM_USER+1 Ws(>} qjy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R_ }(p2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @ ri. r1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]]4E)j8  
class CAboutDlg : public CDialog ^C{a'  
{ ~qF9*{~!  
 public: E}u\{uY  
  CAboutDlg(); gg9W7%t/  
  // Dialog Data }sZ]SE  
  //{{AFX_DATA(CAboutDlg) /k,p]/e  
  enum { IDD = IDD_ABOUTBOX }; t z{]H9  
  //}}AFX_DATA ) AIZE?oX  
  // ClassWizard generated virtual function overrides /~Iy1L#  
  //{{AFX_VIRTUAL(CAboutDlg) S3m+(N"&  
 protected: rX[R`,`>Z[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O%I'   
  //}}AFX_VIRTUAL *`W82V  
  // Implementation ZmDr$iU~  
 protected: f!yxS?j3  
  //{{AFX_MSG(CAboutDlg) Tq+pFEgQ`@  
  //}}AFX_MSG wP i=+  
  DECLARE_MESSAGE_MAP() |(N4x(xl  
}; +}n]A^&I\E  
i F Ab"VA  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5`J. ic  
{ ,LvJ'N  
 //{{AFX_DATA_INIT(CAboutDlg) @`yfft  
 //}}AFX_DATA_INIT C-7.Sa  
} `i-&Z`  
]iPdAwc.1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %rsW:nl  
{ ]pt @  
 CDialog::DoDataExchange(pDX); S@_GjCpn  
 //{{AFX_DATA_MAP(CAboutDlg) ?@#<>7V  
 //}}AFX_DATA_MAP 6S(3tvUr  
} UcZ3v]$I  
'D bHXS7N  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V}*b^<2o 5  
 //{{AFX_MSG_MAP(CAboutDlg) K;K tx>Z/  
 // No message handlers Hd:ZE::Q'#  
 //}}AFX_MSG_MAP "6ZatRUd  
END_MESSAGE_MAP() .d2s4q\  
cg4,PI% hz  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Msf yI B  
: CDialog(CCaptureDlg::IDD, pParent) z y.Ok 49  
{ XjC+kH  
 //{{AFX_DATA_INIT(CCaptureDlg) $]9d((u4  
  m_bControl = FALSE; I'!KWpYJT  
  m_bAlt = FALSE; _%x|,vo`(  
  m_bShift = FALSE; {5*5tCIt  
  m_Path = _T("c:\\"); n\QG-?%Pi  
  m_Number = _T("0 picture captured."); CA3.fu3(p  
  nCount=0; 1\BECP+  
  bRegistered=FALSE; rpd3Rp  
  bTray=FALSE; 22GtTENd1h  
 //}}AFX_DATA_INIT gaJS6*P#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]ba<4:[Go  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); NXV%j},>  
} X'5te0v`3  
yF*JzE 7,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z7(hW,60  
{ g+f{I'j  
 CDialog::DoDataExchange(pDX); 7HzKjR=B  
 //{{AFX_DATA_MAP(CCaptureDlg) 5d)G30  
  DDX_Control(pDX, IDC_KEY, m_Key); (Az^st/_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xKxWtZ0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u5lj+?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p7z#4 GW  
  DDX_Text(pDX, IDC_PATH, m_Path); ), n?"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Yy&0b(m U  
 //}}AFX_DATA_MAP 2$jY_{B+x  
} =U:iR  
#xO`k1W.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1{A 4_/R  
//{{AFX_MSG_MAP(CCaptureDlg) X:DHz0S  
 ON_WM_SYSCOMMAND() GovGh? X#x  
 ON_WM_PAINT() *e^ ZH  
 ON_WM_QUERYDRAGICON() L Nj|t)Ov  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bBZvL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J%nJO3,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) X/@Gx 4  
//}}AFX_MSG_MAP pgI@[zp7  
END_MESSAGE_MAP() sg3%n0Ms.W  
k07O.9>  
BOOL CCaptureDlg::OnInitDialog() S>6APQ-   
{ ohwQ%NDl  
 CDialog::OnInitDialog(); w^r*qi"  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zFOX%q  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?&?y-&.5-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]^s4NXf+  
 if (pSysMenu != NULL) 4kx#=MLt  
 { 1j}o. 0\  
  CString strAboutMenu; <Wl! Qog'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k(s3~S2h  
  if (!strAboutMenu.IsEmpty()) xa K:@/  
  { sR5dC_  
   pSysMenu->AppendMenu(MF_SEPARATOR); /6>2,S8Ar  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); pPh$Jvo]  
  } #ujcT%1G  
 } R(csJ4F  
 SetIcon(m_hIcon, TRUE); // Set big icon B-o"Y'iXs  
 SetIcon(m_hIcon, FALSE); // Set small icon b+{,c@1rd  
 m_Key.SetCurSel(0); ;]p#PNQ0  
 RegisterHotkey(); 2(UT;PSI  
 CMenu* pMenu=GetSystemMenu(FALSE); 0\.y0 K8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); WC`<N4g|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  ;v.l<AOE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $?0<rvGJ  
 return TRUE; // return TRUE unless you set the focus to a control keX0br7u_  
} ~,ac{%8x  
%e3lb<sv6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |gT$M _}  
{ D|OX]3~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  Q}G   
 { b+hZ<U/  
  CAboutDlg dlgAbout; :V`q;g  
  dlgAbout.DoModal(); w^dB1Y7c(W  
 } x *(pr5k  
 else F> ..eK  
 { Ff|?<\x0}A  
  CDialog::OnSysCommand(nID, lParam); _))_mxV{  
 } 5Pn$@3  
} y9:|}Vh  
e=YvM g  
void CCaptureDlg::OnPaint() d!,V"*S  
{ l'c|I &Y]  
 if (IsIconic()) V<+d o|@F  
 { ([s2F%S`@  
  CPaintDC dc(this); // device context for painting >&p_G0-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #t9&X8:U  
  // Center icon in client rectangle +i{&"o4}  
  int cxIcon = GetSystemMetrics(SM_CXICON); }Vg &9HY  
  int cyIcon = GetSystemMetrics(SM_CYICON); cJL>,Z<|%  
  CRect rect; @aI`ru+a  
  GetClientRect(&rect); F)!B%4  
  int x = (rect.Width() - cxIcon + 1) / 2; sA:0b5_a  
  int y = (rect.Height() - cyIcon + 1) / 2; o:m:9dn  
  // Draw the icon }(ot IqE  
  dc.DrawIcon(x, y, m_hIcon); >a Q; 8  
 } TqCzpf&&h/  
 else CI ~+(+q  
 { Zb3E-'G+  
  CDialog::OnPaint(); z;1yZ4[G  
 } =U2`]50  
} RKRk,jRL  
}[? X%=  
HCURSOR CCaptureDlg::OnQueryDragIcon()  gryC#  
{ mR?OSeeB  
 return (HCURSOR) m_hIcon; v;irk<5  
} P 3);R>j  
Xq,{)G%9nM  
void CCaptureDlg::OnCancel() J/WPffqD  
{ *S`& X Pj  
 if(bTray) iw<+rh*C  
  DeleteIcon(); *=)%T(^  
  CDialog::OnCancel(); ,C!MHn^$  
} s:,BcVLx^  
C {gYrz)  
void CCaptureDlg::OnAbout() nQb{/ TqC'  
{ bv-s}UP0  
 CAboutDlg dlg; ;}WdxWw4  
 dlg.DoModal(); xLX:>64'o>  
} V;Te =4  
T^%$  
void CCaptureDlg::OnBrowse() PG+ICg  
{ J_<ENs-  
 CString str; -"#;U`.oh7  
 BROWSEINFO bi; z'XFwk  
 char name[MAX_PATH]; gVEW*8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gd%KBb  
 bi.hwndOwner=GetSafeHwnd(); WR%x4\,d#  
 bi.pszDisplayName=name; 0Evq</  
 bi.lpszTitle="Select folder"; fMP$o3;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ="JLUq*]s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !*'uPw:l2  
 if(idl==NULL) Sc`W'q^X  
  return; Si.3Je[q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d>VerZZU  
 str.ReleaseBuffer(); 5W(G~m?jC6  
 m_Path=str; ok  iI:  
 if(str.GetAt(str.GetLength()-1)!='\\') {?$-p%CF`8  
  m_Path+="\\"; h,LwC9  
 UpdateData(FALSE); ix [aS  
} %\Z{~(&-v  
Ox Zw;yD  
void CCaptureDlg::SaveBmp() E}00y%@*J  
{ LSs!U 3"  
 CDC dc; 8%@7G*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ZEiW\ V  
 CBitmap bm; S8TJnv`?'  
 int Width=GetSystemMetrics(SM_CXSCREEN); 37Q9goMov  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z4b<$t[u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #"jEc*&=  
 CDC tdc; ckHHD|  
 tdc.CreateCompatibleDC(&dc); h}nceH0s3d  
 CBitmap*pOld=tdc.SelectObject(&bm); KD11<&4_x  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n3da@ClBt  
 tdc.SelectObject(pOld); 'P3CgpF<Z2  
 BITMAP btm; I&,gCZ#  
 bm.GetBitmap(&btm); rd vq(\A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lb{<}1YR0o  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M[g9D  
 BITMAPINFOHEADER bih; cNZuwS~,  
 bih.biBitCount=btm.bmBitsPixel; R/VrBiw  
 bih.biClrImportant=0; TyI"fP  
 bih.biClrUsed=0; }'U "HHv  
 bih.biCompression=0; /J")S?. [u  
 bih.biHeight=btm.bmHeight; WPPz/c|j  
 bih.biPlanes=1; MdV-;uf  
 bih.biSize=sizeof(BITMAPINFOHEADER); :7 Ro9z8  
 bih.biSizeImage=size; N<}{oIsZ+  
 bih.biWidth=btm.bmWidth; KP(RK4F  
 bih.biXPelsPerMeter=0; c*sK| U7)  
 bih.biYPelsPerMeter=0; p(g0+.?`~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mR\rK&'6  
 static int filecount=0; FJ#:RC  
 CString name; XT~!dq5  
 name.Format("pict%04d.bmp",filecount++); @doo2qqIe]  
 name=m_Path+name; <x e=G]v  
 BITMAPFILEHEADER bfh; 6nRXRO  
 bfh.bfReserved1=bfh.bfReserved2=0; j-e/nZR@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |j3mI\ANF  
 bfh.bfSize=54+size; aY&He~  
 bfh.bfOffBits=54; @8a1a3_F  
 CFile bf; |1iCt1~U  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ z~i=\/~tZ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Yx>y(Whu.  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 16Ym*kWIps  
  bf.WriteHuge(lpData,size); V<A_c^unO  
  bf.Close(); 4=^_ 4o2  
  nCount++; zGjf7VV2a  
 } ~<!b}Hv  
 GlobalFreePtr(lpData); 5Arx"=c  
 if(nCount==1) \3a(8Em  
  m_Number.Format("%d picture captured.",nCount); 'mx_]b^O  
 else U{6i5;F#H  
  m_Number.Format("%d pictures captured.",nCount); aZ"9)RJe  
  UpdateData(FALSE); 1iyd{r7|  
} F0 x5(lp Q  
?nN3K   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Xk8+  
{ zX *+J"x  
 if(pMsg -> message == WM_KEYDOWN) MLf,5f;e  
 { !|}(tqt  
  if(pMsg -> wParam == VK_ESCAPE) A14}  
   return TRUE; Hyx%FN=  
  if(pMsg -> wParam == VK_RETURN) &.~Xl:lq  
   return TRUE; s4h3mypw  
 } UlF=,0P  
 return CDialog::PreTranslateMessage(pMsg); 9U$n;uA  
} j{PuZ^v1  
o_C j o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t F^|,9_<  
{ eJD !dGa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /|v:$iH,C  
  SaveBmp(); .b'hVOs{  
  return FALSE; #Q320}]{  
} DWT4D)C,U  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ OJ0Dw*K<  
 CMenu pop; KFd !wZ @e  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7[aSP5e>T  
 CMenu*pMenu=pop.GetSubMenu(0); k=L(C^VP  
 pMenu->SetDefaultItem(ID_EXITICON); :y#KR\T1  
 CPoint pt; <7Igd6u  
 GetCursorPos(&pt); agdiJ-lyQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); nW?DlECo?  
 if(id==ID_EXITICON) T <J%|d .'  
  DeleteIcon(); woIcW  
 else if(id==ID_EXIT) 0=  ]RG  
  OnCancel(); U6SgV 8  
 return FALSE; l{OU \  
} Hp`Mp)1s  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9;,_Q q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) E5@U~|V[  
 AddIcon(); g_{hB5N](7  
 return res; aI @&x  
} TXx%\V_6  
B]jI^( P  
void CCaptureDlg::AddIcon() >:7W.QLRU  
{ _h;#\ )%~  
 NOTIFYICONDATA data; j n[%@zD}  
 data.cbSize=sizeof(NOTIFYICONDATA); O{WJi;l  
 CString tip; tu(k"'aJ  
 tip.LoadString(IDS_ICONTIP); } ti+tM*  
 data.hIcon=GetIcon(0); Z[+H$=$%  
 data.hWnd=GetSafeHwnd(); eyPh^c]?`8  
 strcpy(data.szTip,tip); gHCk;dmq81  
 data.uCallbackMessage=IDM_SHELL; oB$7m4xO\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -?)` OHc^  
 data.uID=98; w s(9@  
 Shell_NotifyIcon(NIM_ADD,&data); Sg$14B  
 ShowWindow(SW_HIDE); !B 36+W+  
 bTray=TRUE; ]u~6fknm  
} 6uWzv~!*D  
-8F~Tffx  
void CCaptureDlg::DeleteIcon() }*0OLUFFJ  
{ L_$M9G|5n  
 NOTIFYICONDATA data; aBL+i-  
 data.cbSize=sizeof(NOTIFYICONDATA); bqB gq  
 data.hWnd=GetSafeHwnd(); 4E&= qC]S  
 data.uID=98; jTjGbC]X  
 Shell_NotifyIcon(NIM_DELETE,&data); TM_ MJp  
 ShowWindow(SW_SHOW); -.#He  
 SetForegroundWindow(); |cZKj|0>  
 ShowWindow(SW_SHOWNORMAL); Id->F0x0  
 bTray=FALSE; 5$SO  
}  ^"Y5V5  
K&{*sa r  
void CCaptureDlg::OnChange() 3'(w6V  
{ @r.u8e)l  
 RegisterHotkey(); ,]ALyWGuX  
} fG;(&Dx  
'MEO?]Tf.^  
BOOL CCaptureDlg::RegisterHotkey() ep]tio_  
{ )2c[]d /a4  
 UpdateData(); WgBV,{ C  
 UCHAR mask=0; **jD&h7$s-  
 UCHAR key=0; K%TlBK V  
 if(m_bControl) w`~j(G4N  
  mask|=4; CfFNk "0{  
 if(m_bAlt) m*VM1kV  
  mask|=2; 1EW-%GQO  
 if(m_bShift) S&BJR!FQ  
  mask|=1; ]@@3]  
  key=Key_Table[m_Key.GetCurSel()]; 7.O1 ~-  
 if(bRegistered){ qGS]2KY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); i2<dn)K[~-  
  bRegistered=FALSE; z` b. ~<P  
 } ]sz3:p=5  
 cMask=mask; Vab+58s5  
 cKey=key; {ZK"K+;h  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); UH8)r  
 return bRegistered; E|f&SEnzK  
} a8fLj  
1zE_ SNx  
  四、小结 (0%0+vY  
?&Y3Fr)%  
  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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