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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: y7 W7270)  
  3 _DJ  
  一、实现方法 y=y#*yn&  
'khhn6itA  
  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: (TGG?V  
cC`PmDGq  
#pragma data_seg("shareddata") nfr..4,:  
HHOOK hHook =NULL; //钩子句柄 /$ueLa  
UINT nHookCount =0; //挂接的程序数目  D z>7.'3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7LW %:0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $xj>j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey euh rEjwkH  
static int KeyCount =0; hKK"D:?PRs  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 o:/yme G  
#pragma data_seg() K&vqk/JW1  
%LdFS~  
  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。 yD&UH_ 1g  
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  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: f'M7x6W  
QW@`4W0F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #J c)v0_  
cKey,UCHAR cMask) pB]+c%\  
{ -+|{#cz  
 BOOL bAdded=FALSE; '%A*Z,f  
 for(int index=0;index<MAX_KEY;index++){ !RdubM  
  if(hCallWnd[index]==0){ O:O +Q!58  
   hCallWnd[index]=hWnd; u#34mg..  
   HotKey[index]=cKey; v/7iu*u  
   HotKeyMask[index]=cMask; F, p~O{ Q  
   bAdded=TRUE; a<Pt m(,  
   KeyCount++; jP"='6Vrw  
   break; )VR/a  
  } yy3-Xu4  
 } >9]i#So^  
 return bAdded; w w{07g  
} iX'#~eK*<  
//删除热键 :.EVvuXI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '^6x-aeq[D  
{ #v4q:&yKf  
 BOOL bRemoved=FALSE; *e-+~/9~  
 for(int index=0;index<MAX_KEY;index++){ VbzW4J_  
  if(hCallWnd[index]==hWnd){ M)CE%/P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UzmD2A sO"  
    hCallWnd[index]=NULL; y 4jelg  
    HotKey[index]=0; S A16Ng  
    HotKeyMask[index]=0; A@lY{e  
    bRemoved=TRUE; Jq?"?d|:  
    KeyCount--; 7q _.@J  
    break; m:XMF)tW  
   } ghqq%g  
  } !@-g9z  
 } .EoLJHL }  
 return bRemoved; 8klu*  
} 7~Md6.FtM  
% g*AGu`  
dD8f`*"*=  
  DLL中的钩子函数如下: HBnnIbEtF'  
zc#aQ.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5S ?+03h~  
{ ;O7<lF\7o  
 BOOL bProcessed=FALSE; 9i+SU|;j  
 if(HC_ACTION==nCode) w[wrZ:[  
 { RBzBR)@5   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 U: Q&sq8U  
   switch(wParam) 4#y  
   {  :vJ0Ypz-u  
    case VK_MENU: 7$* O+bkn:  
     MaskBits&=~ALTBIT; GE[J`?E]  
     break; #!X4\+)  
    case VK_CONTROL: :Vf:_;  
     MaskBits&=~CTRLBIT; ;4 ON  
     break; 9Iod[ x  
    case VK_SHIFT: ]1 OZY@  
     MaskBits&=~SHIFTBIT; nE3'm[)  
     break; S2 0L@e"U  
    default: //judge the key and send message @eGJ_ J  
     break; 5b2_{6t  
   } tk <R|i  
   for(int index=0;index<MAX_KEY;index++){ zLiFk<G@Xi  
    if(hCallWnd[index]==NULL) 7R=cxD&  
     continue; -?$Hr\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kW@,P.88  
    { qEoa%O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?xuhN G@  
     bProcessed=TRUE; #\]:lr{>?4  
    } }XiV$[xHd  
   } .UuCTH;6`  
  } n^ AQ!wC  
  else if((lParam&0xc000ffff)==1){ //有键按下 2& l~8,  
   switch(wParam) zLxO\R!d  
   { "NamP\hj  
    case VK_MENU: hkq[xgX  
     MaskBits|=ALTBIT; X_eh+>D  
     break; =i/7&gC  
    case VK_CONTROL: }t[?g)"M#-  
     MaskBits|=CTRLBIT; Y&Sk/8  
     break; VY5/C;0^h  
    case VK_SHIFT: KPOr8=Rc  
     MaskBits|=SHIFTBIT; p=65L  
     break;  !Z'x h +  
    default: //judge the key and send message |h; _r&  
     break; dt(#|8i%  
   } M 8BN'% S  
   for(int index=0;index<MAX_KEY;index++){ Ok=RhoZZ  
    if(hCallWnd[index]==NULL) CN$wlhs  
     continue; [y}0X^9,E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;r_YEPlZ  
    { zMkjdjb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l25E!E-'b  
     bProcessed=TRUE; =;9*gDfD  
    } n%>c4*t  
   } (gv1f  
  } 7aJLC!  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^$7Lmd.qI  
   for(int index=0;index<MAX_KEY;index++){ N{u4  
    if(hCallWnd[index]==NULL) lIg;>|'Z5&  
     continue; L)cy&"L|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pUs s_3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xi.L?"^/!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pk*cc h#  
   } R)3P"sGuN  
  } ^f -?xXPx  
 } Q}N.DM@d3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); oc>ne]_'  
} v^a. b  
f<V#Yc(U }  
  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: :1eJc2o  
y^#jM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8#9 di  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Su0[f/4m.Q  
$\|$ekil4  
  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: p1 9j  
F(-Q]xj,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I&oHVFY+  
{ 1Y"[Qs]"mU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) v(T;Y=&  
 { v(? ^#C>6W  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,iXE3TN;W  
  SaveBmp(); C w<bu|?  
  return FALSE; $DmWK_A  
 } <Q06<{]R8  
 …… //其它处理及默认处理 ))" *[  
} /Ot=GhN]  
q^ {Xn-G  
pv.0!a/M  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 aN7VGc  
ZE@!s3\  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 V=pg9KR!T  
%C_RBd  
  二、编程步骤 6OJ`R.DM`  
xr uQ=Q  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; tK3.HvD  
D 6trqB  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {%(_Z`vI  
]wg+zOJu]+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; \dAh^BK1(  
uFM]4v3  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; NrE&w H:  
ANNfL9:Jy  
  5、 添加代码,编译运行程序。 &D "$N"  
t{\FV@R  
三、程序代码 _cqB p7  
iV!o)WvG,F  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *~F\k):>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) tN&x6O+@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8Yr_$5R  
#if _MSC_VER > 1000 %(GWR@mfC  
#pragma once ?\dY!  
#endif // _MSC_VER > 1000 #>+O=YO  
#ifndef __AFXWIN_H__ - Dm/7Sxd`  
#error include 'stdafx.h' before including this file for PCH 7q>WO  
#endif S3V3<4CB  
#include "resource.h" // main symbols w /$4 Rv+S  
class CHookApp : public CWinApp p/|]])2  
{ uFDJRQJ<  
 public: %oas IiO  
  CHookApp(); 'u }|~u?m  
  // Overrides SomA`y+ERn  
  // ClassWizard generated virtual function overrides F V8K_xj  
  //{{AFX_VIRTUAL(CHookApp) sW[8f Z71  
 public: \IL/?J 5d  
  virtual BOOL InitInstance(); -4|\,=j  
  virtual int ExitInstance(); nPp\IE}:  
  //}}AFX_VIRTUAL ^EGe%Fq*x]  
  //{{AFX_MSG(CHookApp) _T6l*D  
  // NOTE - the ClassWizard will add and remove member functions here. QMoh<[3qu  
  // DO NOT EDIT what you see in these blocks of generated code ! [hs_HYqJ  
  //}}AFX_MSG _&TA|Da  
  DECLARE_MESSAGE_MAP() c:0nOP  
}; ) -+u8#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ?{W@TY@S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H#IJ&w|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zc&>RM  
BOOL InitHotkey(); 8A{n9>jrb  
BOOL UnInit(); .CI { g2  
#endif q@K;u[zFK  
rPoPs@CBD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vd Fy}#X  
#include "stdafx.h" ?;pw*s1Atz  
#include "hook.h" `y5?lS*  
#include <windowsx.h> Ca]+*Eb9z{  
#ifdef _DEBUG R[Q`2ggG  
#define new DEBUG_NEW LeBuPR$  
#undef THIS_FILE 413,O~^  
static char THIS_FILE[] = __FILE__; V!#+Ti/w4  
#endif )UA$."~O  
#define MAX_KEY 100 :<ye:P1s  
#define CTRLBIT 0x04 %|L+~=  
#define ALTBIT 0x02 B#RwW,  
#define SHIFTBIT 0x01 j(4BMk  
#pragma data_seg("shareddata") " N)dle,  
HHOOK hHook =NULL; *oAv:8"iY  
UINT nHookCount =0; P;o6rQf  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^&oa\7<'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT D_oGhQYY4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey t sdkpt  
static int KeyCount =0; 2GNtO!B.  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0d!1;jy,T  
#pragma data_seg() iiS^xqSNCt  
HINSTANCE hins; {ndL]c'v  
void VerifyWindow(); |7Fe~TC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J;|r00M  
//{{AFX_MSG_MAP(CHookApp) DIR_W-z  
// NOTE - the ClassWizard will add and remove mapping macros here. hGmJG,H  
// DO NOT EDIT what you see in these blocks of generated code! (q'w"qj  
//}}AFX_MSG_MAP KE3/sw0  
END_MESSAGE_MAP() XQAdb"`  
tZlz0BY!  
CHookApp::CHookApp() *RugVH4  
{ BgLW!|T[  
 // TODO: add construction code here, '=?IVm #C  
 // Place all significant initialization in InitInstance va \ 5  
} x<#Z3Kla  
Q2sX7 cE  
CHookApp theApp; qL kna  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Rg3 Lo ?  
{ UELni,$  
 BOOL bProcessed=FALSE;  nN!/  
 if(HC_ACTION==nCode) Kbjt  CI7  
 { CR*R'KX D%  
  if((lParam&0xc0000000)==0xc0000000){// Key up EgO=7?(pW  
   switch(wParam) }LLnJl~Z  
   { b0 ))->&2  
    case VK_MENU: ))"J  
     MaskBits&=~ALTBIT; s[h& Uv"G  
     break; F(*~[*Ff  
    case VK_CONTROL: 9U1cH qV  
     MaskBits&=~CTRLBIT; r8\"'4B1  
     break; `9QvokD  
    case VK_SHIFT: Ipo?>To  
     MaskBits&=~SHIFTBIT; V?U->0>Z4  
     break; "Sp+Q&2U  
    default: //judge the key and send message MNURYA=  
     break; k,o|"9H  
   } CAg\-*P|  
   for(int index=0;index<MAX_KEY;index++){ e%#(:L  
    if(hCallWnd[index]==NULL) 6x%uWZa'  
     continue; bp G`,[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b#%s!  
    { @i`*i@g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7kmU/(8  
     bProcessed=TRUE; $Lpt2:.((  
    } k$`~,LJp  
   } '51DdT U  
  } `Oz c L  
  else if((lParam&0xc000ffff)==1){ //Key down TCAtb('D  
   switch(wParam) X;JptF^  
   { U X)k;h  
    case VK_MENU: %_xRS  
     MaskBits|=ALTBIT; n(^{s5 Rr  
     break; :G$f)NMK  
    case VK_CONTROL: D 3m4:z  
     MaskBits|=CTRLBIT; .{+<o  
     break; [gm[mwZ  
    case VK_SHIFT: KKm &~^c  
     MaskBits|=SHIFTBIT; wYnsd7@I  
     break; 4$Oakl*l  
    default: //judge the key and send message m89-rR:Kc  
     break; P/;sZo  
   } h=6Zvf<x  
   for(int index=0;index<MAX_KEY;index++) [<m1xr4"k  
   { 7{HJjH!zx  
    if(hCallWnd[index]==NULL) >r+Dl\R  
     continue; Q]WjW'Ry\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g{K*EL <  
    { o33 wePx,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C?6wIdp  
     bProcessed=TRUE; J#DYZ>}Y  
    } Zcq'u jU  
   } 7PG&G5  
  } JR/:XYS+  
  if(!bProcessed){ b4`t, D  
   for(int index=0;index<MAX_KEY;index++){ lUWX[,  
    if(hCallWnd[index]==NULL) le%&r  
     continue; r7w1~z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N)Fy#6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wi'CBfr'z  
   } \T)2J|mW  
  } "~~Js~  
 } JWhi*je  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ' b41#/-  
} 9W3zcL8  
wc7gOrPpm  
BOOL InitHotkey() L{y%\:]  
{ u 0M[B7Q  
 if(hHook!=NULL){ ?+-uF }  
  nHookCount++; nNNs3h(Ss  
  return TRUE; <SeK3@Gi  
 } 5Vo8z8]t`  
 else 8,\toT7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); k}T#-Gb  
  if(hHook!=NULL) 1} 1.5[4d  
   nHookCount++; :o$k(X7a  
  return (hHook!=NULL); ,B|~V 3)(  
} 7x8/Vz@\  
BOOL UnInit() !d Ns3d  
{ Cf@~W)K  
 if(nHookCount>1){ V 8`o71p  
  nHookCount--; eZes) &4  
  return TRUE; 9 cU]@j}2  
 } J^tLKTB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !#l>+9  
 if(unhooked==TRUE){ AD_RU_a9  
  nHookCount=0; l{tpFu9v  
  hHook=NULL; *x[ZN\$`Y  
 } \.c   
 return unhooked; LWG%]m|C  
} &''lOS|  
(tQ#('(w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Pf`HF|NI  
{ o6LeC*  
 BOOL bAdded=FALSE;  ~DYUI#x  
 for(int index=0;index<MAX_KEY;index++){ i("ok  
  if(hCallWnd[index]==0){ f' |JLhs  
   hCallWnd[index]=hWnd; TEQs\d  
   HotKey[index]=cKey; O$ dz=)  
   HotKeyMask[index]=cMask; d/I,`  
   bAdded=TRUE; tkT:5O6  
   KeyCount++; fBtTJ+51}  
   break; vv0A5p8H  
  } hSQ*_#  
 } a<%Ivqni  
 return bAdded; X@l>mAk  
} 9H^$cM9C  
MTm}qx@L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9FB k|g"U)  
{ ;2Aqztp  
 BOOL bRemoved=FALSE; $oF0[}S  
 for(int index=0;index<MAX_KEY;index++){ DZPg|*KT  
  if(hCallWnd[index]==hWnd){ \NE~k)`4j%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ klkshlk d  
    hCallWnd[index]=NULL; h- )tWJ c  
    HotKey[index]=0; *F:f\9   
    HotKeyMask[index]=0; SUv(MA&  
    bRemoved=TRUE; XcN"orAo  
    KeyCount--; tzH~[n,  
    break; pC=kvve  
   } WC2sRv4]3  
  } yU ?TdM\  
 } hnOo T? V  
 return bRemoved; IRWVoCc9/\  
} p7H0|>  
g!/O)X3  
void VerifyWindow() Ife/:v  
{ D==C"}J  
 for(int i=0;i<MAX_KEY;i++){ 6ZvGD}/  
  if(hCallWnd!=NULL){ v#/k`x\  
   if(!IsWindow(hCallWnd)){ l1_hD ,4  
    hCallWnd=NULL; {lv@V*_Y0  
    HotKey=0; jU~q~e7Te  
    HotKeyMask=0; L !/Zw~  
    KeyCount--; K+HP2|#6  
   } )DR/Xu;b  
  } <L!9as]w  
 } d@d\9*mn  
} ~m`j=ot  
42E%&DF  
BOOL CHookApp::InitInstance() EV=/'f[++  
{ &k\`!T1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); X ? eCK,  
 hins=AfxGetInstanceHandle(); |aD8  
 InitHotkey(); a] =k-Xh  
 return CWinApp::InitInstance(); %%uvia=e  
} <c; U 0! m  
,> %=,x  
int CHookApp::ExitInstance() VD.wO%9?)  
{ ?$v*_*:2h  
 VerifyWindow(); E@.daUoB  
 UnInit(); 9E`Laf  
 return CWinApp::ExitInstance(); O0`o0 !=P  
} <m"fzT<"  
zDD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file B183h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?WEKRl  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $[S)A0O  
#if _MSC_VER > 1000 4,g[g#g<q  
#pragma once bd'io O  
#endif // _MSC_VER > 1000 }0okyGg>q  
lf`" (:./  
class CCaptureDlg : public CDialog obzdH:S  
{ 7)-uYi] dA  
 // Construction IjaFNZZC!  
 public: |BA&ixHe~C  
  BOOL bTray; 5MX7V4ist  
  BOOL bRegistered; x->H~/  
  BOOL RegisterHotkey(); $^K12Wcp-  
  UCHAR cKey; lVptA3F  
  UCHAR cMask; xR~9|H9a  
  void DeleteIcon(); _keI0ML-#  
  void AddIcon(); 8x~'fzf;Sq  
  UINT nCount; .]XBJc  
  void SaveBmp(); b)(si/]\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor u.yjk/jF  
  // Dialog Data eeVzOq(  
  //{{AFX_DATA(CCaptureDlg) TxA%{0  
  enum { IDD = IDD_CAPTURE_DIALOG }; FE=vUQXE2  
  CComboBox m_Key; DeK&_)g| Z  
  BOOL m_bControl; OCN:{  
  BOOL m_bAlt; tO}Y=kZa{  
  BOOL m_bShift; NG+%H1!$_  
  CString m_Path; } q?*13iy(  
  CString m_Number; };m.8(}$)  
  //}}AFX_DATA ^ }kqAmr  
  // ClassWizard generated virtual function overrides #Fkn-/nL  
  //{{AFX_VIRTUAL(CCaptureDlg) G=( ja?d  
 public: vp|.x |@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )u?^w  
 protected: cgV5{|P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1lLXu  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -IE=?23Do?  
  //}}AFX_VIRTUAL "2_nN]%u-  
  // Implementation %|(Cb!ySX  
 protected: =38c}(  
  HICON m_hIcon; qZ<|A%WQ  
  // Generated message map functions a/Ik^:>m  
  //{{AFX_MSG(CCaptureDlg) Nm{J=`  
  virtual BOOL OnInitDialog(); -Pp =)_O  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :"Gd;~p.  
  afx_msg void OnPaint(); Sp-M:,H3H  
  afx_msg HCURSOR OnQueryDragIcon(); Yu+;vjbK-  
  virtual void OnCancel(); [M#I Nm}  
  afx_msg void OnAbout(); *|B5,Ey  
  afx_msg void OnBrowse(); gR 76g4|=;  
  afx_msg void OnChange(); u OB`A-K  
 //}}AFX_MSG W<\*5oB%H  
 DECLARE_MESSAGE_MAP() X,`^z,M%I  
};  __Egr@  
#endif gg?O0W{  
LZ4Z]!V  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _]Y9Eoz  
#include "stdafx.h" =<.h.n  
#include "Capture.h" j"Z9}F@  
#include "CaptureDlg.h" '>Uip+'  
#include <windowsx.h> Hdda/?{b  
#pragma comment(lib,"hook.lib") zlhU[J}"1|  
#ifdef _DEBUG }>yQ!3/i  
#define new DEBUG_NEW F7&Oc)f"B  
#undef THIS_FILE W61nJ7@  
static char THIS_FILE[] = __FILE__; zwgO|Qg;  
#endif - (VX+XHW  
#define IDM_SHELL WM_USER+1 z)fg>?AGr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [&5%$ T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {(5M)|>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RD6`b_]o  
class CAboutDlg : public CDialog 83pXj=k<  
{ l0BYv&tu  
 public: rodr@  
  CAboutDlg(); 4<A+Tf  
  // Dialog Data K!O7q~s[D  
  //{{AFX_DATA(CAboutDlg) !{S HlS  
  enum { IDD = IDD_ABOUTBOX }; ' fka?lL  
  //}}AFX_DATA 9RQw6rL  
  // ClassWizard generated virtual function overrides w9,w?%F  
  //{{AFX_VIRTUAL(CAboutDlg) CuA A)Bj  
 protected: V\/5H~L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support yIf>8ed]#  
  //}}AFX_VIRTUAL J%1 2Ey@6  
  // Implementation i{MzQE+_^  
 protected: pIgjo>K  
  //{{AFX_MSG(CAboutDlg) ` 7jdV  
  //}}AFX_MSG K {__rO  
  DECLARE_MESSAGE_MAP() NGAjajB  
}; ;|D8"D6]  
:rnj>U6<>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s}Q*zy  
{ 2 X`5YN;  
 //{{AFX_DATA_INIT(CAboutDlg) nD!5I@D  
 //}}AFX_DATA_INIT te b/  
} %)}y[ (  
pVC; ''E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) OcZ8:`=%  
{ de q L  
 CDialog::DoDataExchange(pDX); !3Ed0h]Bfa  
 //{{AFX_DATA_MAP(CAboutDlg) 8gXf4A(N  
 //}}AFX_DATA_MAP ~Aoo\fN_U  
} e) kVS}e?  
vFH1hm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) P3+?gW'  
 //{{AFX_MSG_MAP(CAboutDlg) (T8dh|  
 // No message handlers dL|*#e  
 //}}AFX_MSG_MAP f1RX`rXf  
END_MESSAGE_MAP() JAS!eF  
(E<QA  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /u pDbP.O  
: CDialog(CCaptureDlg::IDD, pParent) h%!N!\  
{ YnwP\Arfq  
 //{{AFX_DATA_INIT(CCaptureDlg) i4\m/&of3y  
  m_bControl = FALSE; [8rl{~9E  
  m_bAlt = FALSE; X.)D"+xnH  
  m_bShift = FALSE; Y5\=5r/  
  m_Path = _T("c:\\"); RrRE$g  
  m_Number = _T("0 picture captured."); )"H r3  
  nCount=0; }NF7"tOL  
  bRegistered=FALSE; #RVN 7-x  
  bTray=FALSE; $#7~  
 //}}AFX_DATA_INIT  rhO 8v  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {"@E_{\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +^V%D!.$@  
} { GKqOu  
rEY5,'?YHv  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lPOcX'3\  
{ 2R`/Oox   
 CDialog::DoDataExchange(pDX); 5}he)2*uD  
 //{{AFX_DATA_MAP(CCaptureDlg) IWP[?U=  
  DDX_Control(pDX, IDC_KEY, m_Key); =J827c{.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); D",~?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &46 Ro|XE`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \"AzT{l!;  
  DDX_Text(pDX, IDC_PATH, m_Path); zR6^rq*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); % #-'|~  
 //}}AFX_DATA_MAP 6),VN>j  
} "&N1$$  
"|%'/p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `'}c- Q  
//{{AFX_MSG_MAP(CCaptureDlg) +,A7XBn  
 ON_WM_SYSCOMMAND() ~4C:2  
 ON_WM_PAINT() bT#re  
 ON_WM_QUERYDRAGICON() X8| 0RU@f  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) :Tn1]a)f6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c(!8L\69V}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) EP}NT)z,{  
//}}AFX_MSG_MAP F<|x_6a\  
END_MESSAGE_MAP() B4ky%gF4  
8jm\/?k|  
BOOL CCaptureDlg::OnInitDialog() M,/{53  
{ q?2kD"%$  
 CDialog::OnInitDialog(); @Yy']!Ju  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H/BU2sa  
 ASSERT(IDM_ABOUTBOX < 0xF000); b8TwV_&|X  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5$Aiez~tBq  
 if (pSysMenu != NULL) r-IG.ym3  
 { t*cVDA&K  
  CString strAboutMenu; i}}}x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Hsi<!g.  
  if (!strAboutMenu.IsEmpty()) @T 8$/  
  { fk  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,?ci+M)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =EdLffU[J  
  } Q2HULz{  
 } U8s&5~IPn  
 SetIcon(m_hIcon, TRUE); // Set big icon bsgrg  
 SetIcon(m_hIcon, FALSE); // Set small icon  p@bcf5'  
 m_Key.SetCurSel(0); i0e aBG]I  
 RegisterHotkey(); 0F|DD8tHR  
 CMenu* pMenu=GetSystemMenu(FALSE); Q2 @Ugt$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ? bnhx  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s2M|ni=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >5+]~[S  
 return TRUE; // return TRUE unless you set the focus to a control s^Wh!:>r/  
} ~<&47'D  
PTFe>~vr*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M~#% [?iU  
{ 7n*[r*$  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) of>"qrdZ  
 { RmcQGQ  
  CAboutDlg dlgAbout; K^fH:pV  
  dlgAbout.DoModal(); -+w^"RBV  
 } XVNJ3/  
 else GO=3<Q{;  
 { t ]yD95|  
  CDialog::OnSysCommand(nID, lParam); T{Rhn V1  
 } o6~9.~_e  
} gBCO>nJws  
+ ZxG<1&  
void CCaptureDlg::OnPaint() UJ8V%0  
{ oiY&O]}  
 if (IsIconic()) sU }.2k  
 { FsyM{LT  
  CPaintDC dc(this); // device context for painting /vG)n9Rc  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q*B(ZG  
  // Center icon in client rectangle h.D*Y3=<  
  int cxIcon = GetSystemMetrics(SM_CXICON); .ECT  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?Pw(  
  CRect rect; -yH8bm'0"  
  GetClientRect(&rect); FELTmQUV  
  int x = (rect.Width() - cxIcon + 1) / 2; I:9jn"  
  int y = (rect.Height() - cyIcon + 1) / 2; ,}hJ)  
  // Draw the icon nax(V  
  dc.DrawIcon(x, y, m_hIcon); &T) h9fyc  
 } %.+#e  
 else 5gnmRd  
 { ;zc,vs  
  CDialog::OnPaint(); ON~K(O2g(  
 } l{b*YUsz>  
} BvA09lK  
XK7$Xbd  
HCURSOR CCaptureDlg::OnQueryDragIcon() j/+e5.EX/  
{ ywS2` (  
 return (HCURSOR) m_hIcon; qq1@v0  
} Z}*{4V`R  
1__Mf.A  
void CCaptureDlg::OnCancel() $7bl,~Z  
{ TaN]{k  
 if(bTray) M~+T $K  
  DeleteIcon(); lImg+r T{  
  CDialog::OnCancel(); "2~%-;c  
} RN"O/b}qQ  
%W [#60  
void CCaptureDlg::OnAbout() O3>m,v  
{ WFBVAD  
 CAboutDlg dlg; ]@D#<[5\  
 dlg.DoModal(); Yo$ xz  
} fqcFfz6?x  
]sf1+3  
void CCaptureDlg::OnBrowse() aHvsgp]  
{ 3.^Tm+ C  
 CString str; ' 3MCb  
 BROWSEINFO bi; ILQB%0!  
 char name[MAX_PATH]; D+"-(k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &+Iv"9  
 bi.hwndOwner=GetSafeHwnd(); 2/]74d8  
 bi.pszDisplayName=name; It .`  
 bi.lpszTitle="Select folder"; 7^|,l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; klKd !  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); u{_jweZ  
 if(idl==NULL) 9gLUM$Kd  
  return; h *JzJ0X  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); />,Tq!i\4}  
 str.ReleaseBuffer(); SpB\kC"K  
 m_Path=str; '8|y^\  
 if(str.GetAt(str.GetLength()-1)!='\\') [`eqma  
  m_Path+="\\"; FNyr0!t,  
 UpdateData(FALSE); N3`EJY_|V  
} _ Db05:r@  
keYvscRBI  
void CCaptureDlg::SaveBmp() :~1sF_  
{ ,GH;jw)P  
 CDC dc; >){"x(4`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (p FPuV  
 CBitmap bm; ."#M X!  
 int Width=GetSystemMetrics(SM_CXSCREEN); ie f~*:5  
 int Height=GetSystemMetrics(SM_CYSCREEN); Fu%%:3_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j.FW*iX1C  
 CDC tdc; ?t JyQT  
 tdc.CreateCompatibleDC(&dc); 2W_p)8t> b  
 CBitmap*pOld=tdc.SelectObject(&bm); DG!H8^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q|23l1 PI  
 tdc.SelectObject(pOld); 1JIo,7  
 BITMAP btm; Z.]=u(=a  
 bm.GetBitmap(&btm); WE hDep:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; wCwJ#-z.=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C25r3bj  
 BITMAPINFOHEADER bih; { eU_  
 bih.biBitCount=btm.bmBitsPixel; B)bq@jM  
 bih.biClrImportant=0; "&,Gn#'FG  
 bih.biClrUsed=0; N4wv'OrL]  
 bih.biCompression=0; dcGs0b  
 bih.biHeight=btm.bmHeight; M^E\L C  
 bih.biPlanes=1;  GT)63|  
 bih.biSize=sizeof(BITMAPINFOHEADER); wLDWD,"K  
 bih.biSizeImage=size; Z?#_3h$"T  
 bih.biWidth=btm.bmWidth; 1gTW*vLM\  
 bih.biXPelsPerMeter=0; ,>^6ztM  
 bih.biYPelsPerMeter=0; <r{M(yZ?@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \VTNXEw*G  
 static int filecount=0; Q--VZqn  
 CString name; #00k7y>OyD  
 name.Format("pict%04d.bmp",filecount++); hpqM fz1  
 name=m_Path+name; Y}/e" mp  
 BITMAPFILEHEADER bfh; `a!:-.:v  
 bfh.bfReserved1=bfh.bfReserved2=0; !p4y@U{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p..O;_U  
 bfh.bfSize=54+size; z  DP  
 bfh.bfOffBits=54; .)zX<~,  
 CFile bf; bHi0N@W!vG  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ oBm^RHTZ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R>ak 3Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !2R<T/9~  
  bf.WriteHuge(lpData,size); <#hltPyh  
  bf.Close(); ;-OnCLr  
  nCount++; hSO(s  
 } 0 tZ>yR  
 GlobalFreePtr(lpData); \GR M,c  
 if(nCount==1) a*pwVn  
  m_Number.Format("%d picture captured.",nCount); g@va@*|~d  
 else 0!:1o61  
  m_Number.Format("%d pictures captured.",nCount); &7{/ x~S{  
  UpdateData(FALSE); U8T"ABvFP  
}  b* QRd  
/%#LA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =` b/ip5  
{ 4rmSo^vK  
 if(pMsg -> message == WM_KEYDOWN) Gl1Qbd0  
 { 7.r}98V  
  if(pMsg -> wParam == VK_ESCAPE) Aj9Onz,Lg  
   return TRUE; nY#V~^|  
  if(pMsg -> wParam == VK_RETURN) wO&edZ]zb^  
   return TRUE; wClX3l>y  
 } ),<E-Ub  
 return CDialog::PreTranslateMessage(pMsg); `v1Xywg9P  
} q\B048~KK  
[Ipg",Su;f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r@2{>j8  
{ LxM.z1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6evW O!  
  SaveBmp(); R3G+tE/Y  
  return FALSE; Q}a,+*N.  
} @wy&Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ",b3C.  
 CMenu pop; \8~P3M":c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H9x,C/r,  
 CMenu*pMenu=pop.GetSubMenu(0); "71,vUW  
 pMenu->SetDefaultItem(ID_EXITICON); Ag>E%N  
 CPoint pt; Lqt.S|  
 GetCursorPos(&pt); Koi  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aX oD{zA  
 if(id==ID_EXITICON) tA?cHDp4E  
  DeleteIcon(); >d`XR"_e  
 else if(id==ID_EXIT) hr T_0FZV  
  OnCancel(); %<g(EKl  
 return FALSE; 6 N%fJ   
} C)7T'[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +B 4&$z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $#cZJ@;]  
 AddIcon(); 'THcO*<  
 return res; 92@/8,[  
} JYY:~2  
d$3;o&VUNI  
void CCaptureDlg::AddIcon() wIrjWU2  
{ Vr1Wr%  
 NOTIFYICONDATA data; $a.!X8sHB.  
 data.cbSize=sizeof(NOTIFYICONDATA); GwOn&EpY!  
 CString tip; BEQ$p) h  
 tip.LoadString(IDS_ICONTIP); 8sDbvVh1F  
 data.hIcon=GetIcon(0); 23lLoyN  
 data.hWnd=GetSafeHwnd(); x}g5  
 strcpy(data.szTip,tip); ECO4ut.d  
 data.uCallbackMessage=IDM_SHELL; F/"Q0%(m  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "Ih>>|r  
 data.uID=98; V)$y  
 Shell_NotifyIcon(NIM_ADD,&data); NZJ:@J=-  
 ShowWindow(SW_HIDE); jm-J_o;}z6  
 bTray=TRUE; QF  P3S(  
} c]#+W@$  
`5[$8;  
void CCaptureDlg::DeleteIcon() Q^&oXM'x/i  
{ 5wy1%/;  
 NOTIFYICONDATA data; hPC t-  
 data.cbSize=sizeof(NOTIFYICONDATA); Bf72 .gx{0  
 data.hWnd=GetSafeHwnd(); 0{ZYYB&"~J  
 data.uID=98; BFU6?\r  
 Shell_NotifyIcon(NIM_DELETE,&data); g> lJZD@  
 ShowWindow(SW_SHOW); m15MA.R>  
 SetForegroundWindow(); fn%Gu s~  
 ShowWindow(SW_SHOWNORMAL); u|!On  
 bTray=FALSE; 0ssKZ9Lc  
} *V\z]Dy-[  
/Hox]r]'e  
void CCaptureDlg::OnChange() iqzl(9o.D  
{ sr0.4VU1  
 RegisterHotkey(); F{#m~4O  
} LQ,RQ~!  
dLtSa\2Hn  
BOOL CCaptureDlg::RegisterHotkey() +E8Itb,  
{ 4"OUmh9LHB  
 UpdateData(); Yy 4EM  
 UCHAR mask=0; DCJmk6p%0  
 UCHAR key=0; bYuQ"K A$  
 if(m_bControl) 0_}^IiG  
  mask|=4; U~~Y'R\ NU  
 if(m_bAlt) )KZ1Z$<  
  mask|=2; i6"/GSA  
 if(m_bShift) IETdL{`~  
  mask|=1; q P<n<  
  key=Key_Table[m_Key.GetCurSel()]; Sv*@3x  
 if(bRegistered){ ISQC{K']J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }Pm>mQZ},  
  bRegistered=FALSE; -S7PnR6  
 } y8Q96zi  
 cMask=mask; =h?Q.vad  
 cKey=key; ;(a\F  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;j#$d@VG"  
 return bRegistered; f8ap+][  
} 2?",2x09  
oYYns%r}{  
  四、小结 _xg4;W6M=  
}pE8G#O&  
  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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