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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: z p E|  
  p3I"LY  
  一、实现方法 3JCo!n0   
]&cnc8tC  
  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: :xd;=;q5  
. %RM8  
#pragma data_seg("shareddata") b)LT[>f  
HHOOK hHook =NULL; //钩子句柄 f7Gn$E|/r;  
UINT nHookCount =0; //挂接的程序数目 d1b] +AG4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;cor\ R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =!q% 1mP  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |>.Q U3  
static int KeyCount =0; Cp8=8N(Xb  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Nwvlv{k'  
#pragma data_seg() RB5SK#z  
v pI9TG  
  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。 Dw-d`8*  
vg z`+Zj*S  
  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: !wAT`0<94F  
|=?#Xbxz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR NAbVH{*\U  
cKey,UCHAR cMask) dbI>\khI  
{ h>N}M}8  
 BOOL bAdded=FALSE; wPA^nZ^}9c  
 for(int index=0;index<MAX_KEY;index++){ __=H"UhWv  
  if(hCallWnd[index]==0){ uqMw-f/  
   hCallWnd[index]=hWnd; $ [gN#QW%  
   HotKey[index]=cKey; Y'v[2s  
   HotKeyMask[index]=cMask; ] lB zpD  
   bAdded=TRUE; 5xQ-f  
   KeyCount++; >=~\b  
   break; 2]>O ZhS  
  } zM'eqo>!c>  
 } ^Q6J$"Tj  
 return bAdded; N]<(cG&p  
} vQAFgG  
//删除热键 FFHq':v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :^;c(>u{  
{ R.~[$G!  
 BOOL bRemoved=FALSE; odRiCiMH  
 for(int index=0;index<MAX_KEY;index++){ 6Rc=!_v^  
  if(hCallWnd[index]==hWnd){ Knq 9 "k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K1& QAXyP  
    hCallWnd[index]=NULL; 1!#85SMx  
    HotKey[index]=0; %y1!'R:ZW  
    HotKeyMask[index]=0; jc^QWK*q  
    bRemoved=TRUE; Lb*KEF%s  
    KeyCount--; ^ Ltho`  
    break; -yqsJGY  
   } >I5:@6 Z  
  } B9v>="F  
 } T1LYJ]5  
 return bRemoved; 80xr zv  
} _z\/{  
/d`"WK,  
pLMt 2 G  
  DLL中的钩子函数如下: Sg#XcTG  
G7Nw}cVJ)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) / 3A6xPOg  
{ *Gsj pNr-  
 BOOL bProcessed=FALSE; +y7z>Fwl  
 if(HC_ACTION==nCode) %@$UIO,(  
 { 0I}e>]:I  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'B@`gA  
   switch(wParam) m[hL GD'Fi  
   {  %!aU{E|@_  
    case VK_MENU: oA1_W).wJ  
     MaskBits&=~ALTBIT; TP }a9-9?  
     break; fi+}hGj(r  
    case VK_CONTROL: Nw;qJ58@  
     MaskBits&=~CTRLBIT; 0|3I^b  
     break; &|yLTx  
    case VK_SHIFT: {#,<)wFV\  
     MaskBits&=~SHIFTBIT; | ,8z" g  
     break; |s8N  
    default: //judge the key and send message M`MxdwR  
     break; c-LzluWi  
   } d2\ !tJm  
   for(int index=0;index<MAX_KEY;index++){ Ni$'# W?t  
    if(hCallWnd[index]==NULL) Epzg|L1)  
     continue; fF Q|dE;cF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TlG>)Z@/  
    { N&9o  1_}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2HbnE&  
     bProcessed=TRUE;  Rr) 5 [  
    } B2`S0 H  
   } }gp@0ri%5  
  } B(Sy.n  
  else if((lParam&0xc000ffff)==1){ //有键按下 [&x9<f6  
   switch(wParam) R@e'=z[%1  
   { 8K%N7RL|  
    case VK_MENU: G0FzXtu)q  
     MaskBits|=ALTBIT; }nmlN  
     break; 2YD\KXDo  
    case VK_CONTROL: i FI74COam  
     MaskBits|=CTRLBIT; n1[c\1   
     break; t],a1I.gk  
    case VK_SHIFT: )"?4d[ 5  
     MaskBits|=SHIFTBIT; SV7;B?e%Y  
     break; ( ?FH`<  
    default: //judge the key and send message K)Y& I  
     break; bS_#3T  
   } ~.a"jYb7A}  
   for(int index=0;index<MAX_KEY;index++){ ggso9ZlLu+  
    if(hCallWnd[index]==NULL) WBe0^=x  
     continue; 4GYi'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lExQp2E  
    { WQ|:TLQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); J^!;$Hkd  
     bProcessed=TRUE; r]B8\5|<d  
    } 0G%9 @^B  
   } s!6lZ mPM  
  } n#_B4UqW%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;(Yb9Mr)z  
   for(int index=0;index<MAX_KEY;index++){ "ra$x2|=}  
    if(hCallWnd[index]==NULL) 9QZaa(vN  
     continue; lu utyK!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^2+Ex+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UQVL)-Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 :e1h!G  
   } 7iB!Uuc  
  } oO}g~<fYG  
 } [4KQcmJc#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YAi-eL67l  
} {v={q1  
Mf5j'n  
  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: kHM Jh~  
*v<f#hB"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); kk4 |4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #G9 W65f  
sz7*x{E  
  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: kc'$4 J4Tw  
! j~wAdHk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DP_b9o \5  
{ Iix,}kzss  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vHaM yA-  
 { Bfb~<rs[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ct+F\:e  
  SaveBmp(); $QbJT`,mr  
  return FALSE; q~{) {t;  
 } c r=Q39{  
 …… //其它处理及默认处理 gC7!cn  
} manw;`Q  
RB>=#03  
K)SWM3r  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #*A'<Zm  
.:_'l)-  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  3@Ndn  
nnlj#  
  二、编程步骤 Z[O hZ 9  
zCs34=3 D[  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; HcRw9,I'  
bW yimr&B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; FvT&nb{  
&1 \/B  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 0aT:Gy;  
m:BzIcW<\  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ]2zM~  
Jv~R/qaaD  
  5、 添加代码,编译运行程序。 `$a!CJu,  
rzY)vC+ZT  
三、程序代码 aIgexi,  
KpN]9d   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X G#?fr}L  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &YFe"C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y_PA9#v7  
#if _MSC_VER > 1000 #N{]  
#pragma once A %w9Da?B  
#endif // _MSC_VER > 1000 fECV\Z  
#ifndef __AFXWIN_H__ _z p<en[  
#error include 'stdafx.h' before including this file for PCH =7!s8D,[  
#endif rfV'EjiM}  
#include "resource.h" // main symbols (Jp~=6&lKf  
class CHookApp : public CWinApp Y7G sL7I  
{ py6<QoGV  
 public: gUiO66#x  
  CHookApp(); 082}=Tsx   
  // Overrides Xj, %t}  
  // ClassWizard generated virtual function overrides We6eAP/Z  
  //{{AFX_VIRTUAL(CHookApp) ED0cnr\yG  
 public: S5>s&  
  virtual BOOL InitInstance(); !~ o%KQt  
  virtual int ExitInstance(); [$3+5K#  
  //}}AFX_VIRTUAL 2V~E <K-  
  //{{AFX_MSG(CHookApp) UfW=/T  
  // NOTE - the ClassWizard will add and remove member functions here. ]9!y3"..W{  
  // DO NOT EDIT what you see in these blocks of generated code ! SIK:0>yK"  
  //}}AFX_MSG 0E\#!L  
  DECLARE_MESSAGE_MAP() 7_~sa{1R.  
}; D:`Q\za  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Mi]^wCF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $(}rTm  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w_"d&eYdg0  
BOOL InitHotkey(); `2>p#`  
BOOL UnInit(); f )Lcs  
#endif o Mz{j:  
Ry95a%&/s  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. NuOA'e+i  
#include "stdafx.h" ):N#X<b':  
#include "hook.h" Jp jHbG  
#include <windowsx.h> ,#;hI{E  
#ifdef _DEBUG MkW=sD_  
#define new DEBUG_NEW V7,dx@J-  
#undef THIS_FILE Gf8^nfr  
static char THIS_FILE[] = __FILE__; 2: QT`e&  
#endif MKbcJZe  
#define MAX_KEY 100 \.2i?<BC  
#define CTRLBIT 0x04 NV5qF/<M  
#define ALTBIT 0x02 #cQ5-R -1  
#define SHIFTBIT 0x01 (iKJ~bJ  
#pragma data_seg("shareddata") stG +4w  
HHOOK hHook =NULL; 6B]=\H  
UINT nHookCount =0; |!FQQ(1b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |GMo"[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT G=y~)B}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }NDl~5  
static int KeyCount =0; GVhqNy   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _DxHJl  
#pragma data_seg() cs6oD!h  
HINSTANCE hins; ti61&)(  
void VerifyWindow(); 0"7+;(\1Rk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2hV -h  
//{{AFX_MSG_MAP(CHookApp) ?|,:;^2l1  
// NOTE - the ClassWizard will add and remove mapping macros here. :uo)-9_  
// DO NOT EDIT what you see in these blocks of generated code! =`x }9|[  
//}}AFX_MSG_MAP /mwUDf6x  
END_MESSAGE_MAP() J4+WF#xI2  
"{8j!+]4i  
CHookApp::CHookApp() JuZkE9C,${  
{ 7V%P  
 // TODO: add construction code here, -sJ1q^;f@  
 // Place all significant initialization in InitInstance !aSj1 2J  
} $e1.y b%  
9(t(sP_  
CHookApp theApp; F]M-r{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LqYyIbsvf  
{ YM`T"`f  
 BOOL bProcessed=FALSE; *=i&n>  
 if(HC_ACTION==nCode) \me5"ZU  
 { 7:B/ ?E  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3;buC|ky  
   switch(wParam) A+^okT37r  
   { m 3UK`~ji  
    case VK_MENU: M|c_P)7ym  
     MaskBits&=~ALTBIT; uZ8-?  
     break; ~QSX 1w"  
    case VK_CONTROL: y pEMx'p  
     MaskBits&=~CTRLBIT; k.C&6*l!5;  
     break; } E ]l4N2  
    case VK_SHIFT: #b/L~Bw[  
     MaskBits&=~SHIFTBIT; U[MeK)*  
     break; xO_>%F^?  
    default: //judge the key and send message HW]?%9a  
     break; q\@_L.tc[  
   } =4`wYh  
   for(int index=0;index<MAX_KEY;index++){ umns*U%T;  
    if(hCallWnd[index]==NULL) id" `o  
     continue; i&m_G5u88  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2.WI".&y=  
    { %16Lo<DPm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); WOZuFS13  
     bProcessed=TRUE; ,c"J[$i$  
    } VwH|ed$  
   } {C&U q#V  
  } 1UK= t  
  else if((lParam&0xc000ffff)==1){ //Key down f I=G>[  
   switch(wParam)  dwk%!%  
   { tC|?Kl7  
    case VK_MENU: ]y.V#,6e  
     MaskBits|=ALTBIT; (o*YGYC  
     break; 7d R?70Sz  
    case VK_CONTROL: d4ecF%R  
     MaskBits|=CTRLBIT; Nl[&rZ-&  
     break; S3/%;=|  
    case VK_SHIFT: 1J0gjO)AZ  
     MaskBits|=SHIFTBIT; 0Xb\w^  
     break; l<XYDb~op  
    default: //judge the key and send message ntLEk fK{  
     break; |dQz(z&6{5  
   } !-t w  
   for(int index=0;index<MAX_KEY;index++) _{c_z*rM8  
   { ATqblU>D  
    if(hCallWnd[index]==NULL) O|sk "YXF  
     continue; O)`L( x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KANR=G   
    { 2$Xof  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); QL8C!&=  
     bProcessed=TRUE; k 6M D3c  
    } el`?:dY H  
   } y>}r  
  } zHA::6OgPN  
  if(!bProcessed){ nHm29{G0  
   for(int index=0;index<MAX_KEY;index++){ l6#Y}<tq  
    if(hCallWnd[index]==NULL) V\m"Hl>VIU  
     continue; .O"a:^i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W+ ;=8S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (=uT*Cb  
   } C*ep8{B  
  } ewd eC  
 } mH\zSk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i#>t<g`l  
} ^85Eveu  
Awa| (]  
BOOL InitHotkey() {!D(3~MI  
{ /%g9g_rt#  
 if(hHook!=NULL){ \_O#M   
  nHookCount++; 5H.~pc2y  
  return TRUE; hy~[7:/<I&  
 } %IBT85{  
 else R/x3+_.f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !b_(|~7Lc  
  if(hHook!=NULL) ["f6Ern  
   nHookCount++; w[d8#U   
  return (hHook!=NULL); wr"0+J7  
} c45 s #6  
BOOL UnInit() }O7sP^  
{ )Xg5=zn$  
 if(nHookCount>1){ UH-873AK  
  nHookCount--; rmzzbLTu  
  return TRUE; Y>w7%N  
 } dJ I }uQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OY}FtG y  
 if(unhooked==TRUE){ ,2$<Pt;  
  nHookCount=0; <4.Exha;=  
  hHook=NULL; OC*28)  
 } IrQ.[?C  
 return unhooked; 4 9N.P;b  
} nrMW5>&-`  
> )< ?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z(A[xN@/W<  
{ 1W'Ai"DLw  
 BOOL bAdded=FALSE; SbGdcCB  
 for(int index=0;index<MAX_KEY;index++){ yn}Dj9(q  
  if(hCallWnd[index]==0){ ]UUa/ep-  
   hCallWnd[index]=hWnd; T+nID@"36  
   HotKey[index]=cKey; H2BRI d  
   HotKeyMask[index]=cMask; -y|J_;EG  
   bAdded=TRUE; )XN%pn  
   KeyCount++; -B#1+rUW  
   break; 9no<;1+j,  
  } WF`%7A39Af  
 } E>s+"y  
 return bAdded; zQulPU  
} >fWGiFmlk  
3!l>\#q6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Qwpni^D8j  
{ uQ-GJI^t  
 BOOL bRemoved=FALSE; =( |%%,3  
 for(int index=0;index<MAX_KEY;index++){ :W,S  
  if(hCallWnd[index]==hWnd){ PolJo?HZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {EvT7W  
    hCallWnd[index]=NULL; Cg]|x+  
    HotKey[index]=0; }qM^J;uy  
    HotKeyMask[index]=0; 53{\H&q  
    bRemoved=TRUE; TiI/I`A  
    KeyCount--; l SdA7  
    break; 8^}/T#l  
   } E#+2)Q  
  } N_bgWQY  
 } Xd%qebK  
 return bRemoved; X3G593ts  
} j%s,%#al  
@$r[$D v  
void VerifyWindow() **%&|9He  
{ N_NN0  
 for(int i=0;i<MAX_KEY;i++){ ?Vd~  
  if(hCallWnd!=NULL){ ;Va(l$zD  
   if(!IsWindow(hCallWnd)){ Q&:)D7m\)S  
    hCallWnd=NULL; rQ{|0+l  
    HotKey=0; zA9q`ePS  
    HotKeyMask=0; C zJ-tEO  
    KeyCount--; w\GJ,e  
   } 4,LS08&gh  
  } T" {~mQ*  
 } kMCP .D45;  
} Zb=NcEPGy  
XiTi3vCe  
BOOL CHookApp::InitInstance() |p[Mp:^^  
{ L@GICW~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); LHA^uuBN}  
 hins=AfxGetInstanceHandle(); ij0I!ilG4  
 InitHotkey(); g7]S  
 return CWinApp::InitInstance(); pYQSn.`V~  
} #aL.E(%  
@/kI;8  
int CHookApp::ExitInstance() ]:Ep1DIMl  
{ K9EHT-  
 VerifyWindow(); VQpt1cK*  
 UnInit(); w>j5oz}  
 return CWinApp::ExitInstance(); }d}gb`Du  
} QD,m`7(  
k_]'?f7Z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S.`y%t.GP  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) !6=s{V&r1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ LRHod1}mS  
#if _MSC_VER > 1000 ?\,;KNQr  
#pragma once 5 %\K  
#endif // _MSC_VER > 1000 !6-t_S  
&D M3/^70  
class CCaptureDlg : public CDialog +:@^nPfHy  
{ P?V+<c{  
 // Construction =F_uK7W  
 public: s?}qia\~m  
  BOOL bTray; =hTJp/L  
  BOOL bRegistered;  #B~ ;j5  
  BOOL RegisterHotkey(); W,[ RB  
  UCHAR cKey; HD KF>S_S  
  UCHAR cMask; mbbhz,  
  void DeleteIcon(); 5V/&4$.U!  
  void AddIcon(); Z0Sqw  
  UINT nCount; Z~Q5<A9Jz  
  void SaveBmp(); 1R8tR#l  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !O"2)RU1  
  // Dialog Data []@@  
  //{{AFX_DATA(CCaptureDlg) \@Cz 32wg  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0J'^<G TL  
  CComboBox m_Key; sZ=!*tb-  
  BOOL m_bControl; 0x~+=GUN  
  BOOL m_bAlt; o(e(| k {  
  BOOL m_bShift; ]~]TZb  
  CString m_Path; _DSDY$Ec  
  CString m_Number; h81giY]  
  //}}AFX_DATA VgXT4gO!  
  // ClassWizard generated virtual function overrides (nLzWvN  
  //{{AFX_VIRTUAL(CCaptureDlg) m#BXxS#B<_  
 public: EwzcB\m  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3\Xk)a_  
 protected: ^Ak?2,xB#+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _qPKdGoM  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]zj#X\  
  //}}AFX_VIRTUAL 7fypUQ:y  
  // Implementation IrYj#,xJ  
 protected: &I-:=ir  
  HICON m_hIcon; q0%QMut%  
  // Generated message map functions Pxf>=kY  
  //{{AFX_MSG(CCaptureDlg) =M?+KbTJ3  
  virtual BOOL OnInitDialog(); }R+#>P  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VvIUAn  
  afx_msg void OnPaint(); _"p(/H  
  afx_msg HCURSOR OnQueryDragIcon(); q(~jP0pj%  
  virtual void OnCancel(); /F.<Gz;w  
  afx_msg void OnAbout(); &,{ >b[  
  afx_msg void OnBrowse(); l\L71|3"g  
  afx_msg void OnChange(); [O\ )R[J  
 //}}AFX_MSG 3L==p`   
 DECLARE_MESSAGE_MAP() b&yuy  
}; 0Md.3kY  
#endif % m6qL  
'~ B2[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vWmt<E|e  
#include "stdafx.h" K@n-#  
#include "Capture.h" m#WXZr  
#include "CaptureDlg.h" 02EX_tt),  
#include <windowsx.h> Yz2N(g[  
#pragma comment(lib,"hook.lib") =A,T:!}'  
#ifdef _DEBUG L=;T$4+p  
#define new DEBUG_NEW FUSe!f  
#undef THIS_FILE nL^7t7mp  
static char THIS_FILE[] = __FILE__; $'CS/U`E}  
#endif r ts2Jk7f  
#define IDM_SHELL WM_USER+1 <=|^\r !}&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1:<n(?5JI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p}==aNZK  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "a;$uW@.6  
class CAboutDlg : public CDialog 7@ONCG  
{ .7 j#F  
 public: uDG>m7(}/h  
  CAboutDlg(); Fp?M@  
  // Dialog Data #@YKNS[  
  //{{AFX_DATA(CAboutDlg) @>VX]Qe^X  
  enum { IDD = IDD_ABOUTBOX }; 5I[:.o0  
  //}}AFX_DATA }#.OJub  
  // ClassWizard generated virtual function overrides MjQ>& fUK  
  //{{AFX_VIRTUAL(CAboutDlg) |^Yz*r?BJ  
 protected: D@X"1X!F`G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;C=d( pY  
  //}}AFX_VIRTUAL -}xK> ["  
  // Implementation y)|d`qC\  
 protected: N:64Gko"K  
  //{{AFX_MSG(CAboutDlg) >P(.yQ8&kL  
  //}}AFX_MSG /Cwwz  
  DECLARE_MESSAGE_MAP() f8K0/z  
}; _t]Q*i0p  
z{BgAI,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GNHXtu6  
{ uUp>N^mmVH  
 //{{AFX_DATA_INIT(CAboutDlg) 4#W$5_Ny  
 //}}AFX_DATA_INIT L}Sb0 o.  
}  IN6L2/Q  
eI`%J3BxR  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (5`(H.(  
{ A]QGaWK  
 CDialog::DoDataExchange(pDX); ;XNC+mPK  
 //{{AFX_DATA_MAP(CAboutDlg) KRm)|bgE  
 //}}AFX_DATA_MAP @ukL! AV?Y  
} ~)pZ5%C  
o:UNSr  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )RFY2 }  
 //{{AFX_MSG_MAP(CAboutDlg) '_DB0_Dp  
 // No message handlers GZ5DI+3  
 //}}AFX_MSG_MAP 4VF]t X?o  
END_MESSAGE_MAP() ci? \W6  
mK7SEH;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Yt_tAm  
: CDialog(CCaptureDlg::IDD, pParent) 6&i])iH  
{ 7^.g\Kt?  
 //{{AFX_DATA_INIT(CCaptureDlg) j?tE#  
  m_bControl = FALSE; +#>nOn(B  
  m_bAlt = FALSE; 6Yva4Lv  
  m_bShift = FALSE; $5ea[n c  
  m_Path = _T("c:\\"); jN= !Q&^i[  
  m_Number = _T("0 picture captured."); {LKW%G7  
  nCount=0; GRj [2I7:  
  bRegistered=FALSE; ]n1#8T&<*z  
  bTray=FALSE; 8:I-?z;S  
 //}}AFX_DATA_INIT StNA(+rT  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +Y+fM  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0%rE*h9+  
} wmbG$T%k  
(@ BB @G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) AVz907h8  
{ DcRoW  
 CDialog::DoDataExchange(pDX); b~ig$!N]  
 //{{AFX_DATA_MAP(CCaptureDlg) @QpL*F  
  DDX_Control(pDX, IDC_KEY, m_Key); { .i^&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Rbgy?8#9  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ooa"Th<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Ug#B( }/  
  DDX_Text(pDX, IDC_PATH, m_Path); ;\13x][  
  DDX_Text(pDX, IDC_NUMBER, m_Number); T{3-H(-gA  
 //}}AFX_DATA_MAP NP\/9 8|1  
} 4%yeEc ;z  
R Ee~\n+P^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /55 3v;l<  
//{{AFX_MSG_MAP(CCaptureDlg) =yJc pj  
 ON_WM_SYSCOMMAND() k'"R;^~xg  
 ON_WM_PAINT() ;l `(1Q/  
 ON_WM_QUERYDRAGICON() !*qQ 7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n|.>41bJ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9O&MsTmg$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _jCu=l_  
//}}AFX_MSG_MAP um". Z4S  
END_MESSAGE_MAP() T.{]t6t$U  
HD$ r<bl  
BOOL CCaptureDlg::OnInitDialog() m=iKu(2xRq  
{ W+V &  
 CDialog::OnInitDialog(); Q 'e[(^8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1D"EF  
 ASSERT(IDM_ABOUTBOX < 0xF000); Sng3B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /sB,)> X  
 if (pSysMenu != NULL) 2jQ?-/Q8#  
 { (A_H[xP  
  CString strAboutMenu;  GVu-<R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); d_V7w4lK  
  if (!strAboutMenu.IsEmpty()) C?g*c  
  { \@NnL\ t u  
   pSysMenu->AppendMenu(MF_SEPARATOR); }lx'NY~(W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }vF=XA  
  } Rh@UxNy\,  
 } 8"wavh|g4  
 SetIcon(m_hIcon, TRUE); // Set big icon ll"6K I'X  
 SetIcon(m_hIcon, FALSE); // Set small icon KAy uv  
 m_Key.SetCurSel(0); /T&+vzCF  
 RegisterHotkey(); 4kNSF  
 CMenu* pMenu=GetSystemMenu(FALSE); ^!(tc=sr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Q;z'"P   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >O1u![9K|w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9Pm|a~[m  
 return TRUE; // return TRUE unless you set the focus to a control =p8iYtI  
} We"\nOP  
kQ6YQsJ.*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !*k'3r KOW  
{ `LTD|0;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2F,?}jJ.K  
 { unN*L  
  CAboutDlg dlgAbout; kkT=g^D9j  
  dlgAbout.DoModal(); FePWr7Ze  
 } RDqQ6(e"  
 else Oh1a'&  
 { i@YM{FycX  
  CDialog::OnSysCommand(nID, lParam); &xFs0R i(  
 } j{%'A  
} 8;,(D# p  
`C*psS  
void CCaptureDlg::OnPaint() ARB^]  
{ <5c^DA  
 if (IsIconic()) cn$0^7?  
 { p!LaR.8]  
  CPaintDC dc(this); // device context for painting u&Xn#f h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^12}#I  
  // Center icon in client rectangle LtDGu})1  
  int cxIcon = GetSystemMetrics(SM_CXICON); >$A,B  
  int cyIcon = GetSystemMetrics(SM_CYICON); VsRdZ4  
  CRect rect; N?%FVF  
  GetClientRect(&rect); S)@) @3  
  int x = (rect.Width() - cxIcon + 1) / 2; _~b]/]|z#N  
  int y = (rect.Height() - cyIcon + 1) / 2; Oimq P  
  // Draw the icon (Vy`u)gG  
  dc.DrawIcon(x, y, m_hIcon); l\=He  
 } Ot!*,%sjQ  
 else VSc)0eyn  
 { 6~8X/ -02  
  CDialog::OnPaint(); A0uA\E4q  
 } qzE -y-9@  
} % ELf 7~  
8&y3oxA,  
HCURSOR CCaptureDlg::OnQueryDragIcon() p@=B\A]  
{ 3)~z~p7  
 return (HCURSOR) m_hIcon; 3%V VG~[  
} 1GgG9I  
V7Mp<x%  
void CCaptureDlg::OnCancel() 1d~cR  
{ }zwHUf9q1  
 if(bTray) 6:Zd,N=  
  DeleteIcon(); l$!g# ?w  
  CDialog::OnCancel(); oIY@xuj  
} ca!x{,Cvnj  
naW!Mga  
void CCaptureDlg::OnAbout() TSYe ~)I  
{ @{^6_n+gT%  
 CAboutDlg dlg; rt!Uix&  
 dlg.DoModal(); 2Rs-!G< ]  
} [- x]%  
x;>~;vmi  
void CCaptureDlg::OnBrowse() E{Y)=tW[  
{ U3ao:2zP  
 CString str; gl"1;C  
 BROWSEINFO bi; ~f!iz~  
 char name[MAX_PATH]; R`emI7|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); DWar3+u&0  
 bi.hwndOwner=GetSafeHwnd(); 0%hOB :  
 bi.pszDisplayName=name; 1ml{oqNj  
 bi.lpszTitle="Select folder"; bp(X\:zAy  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; "+ 8Y{T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?Kf?Z`9 *Y  
 if(idl==NULL) "0A !fRI~  
  return; L+$9 ,<'[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T! fF1cpF\  
 str.ReleaseBuffer(); gJI(d6  
 m_Path=str; C XiSin  
 if(str.GetAt(str.GetLength()-1)!='\\') >_um-w#C  
  m_Path+="\\"; g:>Mooxzi  
 UpdateData(FALSE); U6R~aRJ;  
} _,9/g^<  
i_qR&X  
void CCaptureDlg::SaveBmp() N2S7=`5/T  
{ l?LP:;S  
 CDC dc; 92K#xM/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); El`f>o+EJ  
 CBitmap bm; aY@st]p  
 int Width=GetSystemMetrics(SM_CXSCREEN); lip1wR7  
 int Height=GetSystemMetrics(SM_CYSCREEN); $P%b?Y/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f^[:w1X$sM  
 CDC tdc; 3XomnL{  
 tdc.CreateCompatibleDC(&dc); #i~2C@]  
 CBitmap*pOld=tdc.SelectObject(&bm); hA_Y@&=W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YF<;s^&@u  
 tdc.SelectObject(pOld); QO%#.s  
 BITMAP btm; ~Uw<E:?v  
 bm.GetBitmap(&btm); ~$3X>?Q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; V$XCe  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cu V}<3&  
 BITMAPINFOHEADER bih; 8HymkL&F  
 bih.biBitCount=btm.bmBitsPixel; 5PU$D`7it  
 bih.biClrImportant=0; *~%# =o  
 bih.biClrUsed=0; XT 'v7  
 bih.biCompression=0; MX{p)(HW  
 bih.biHeight=btm.bmHeight; ir*T ,O 2J  
 bih.biPlanes=1; H+ Y+8   
 bih.biSize=sizeof(BITMAPINFOHEADER); VY=c_Gl  
 bih.biSizeImage=size; g<r'f"^  
 bih.biWidth=btm.bmWidth; F( Iq8DV  
 bih.biXPelsPerMeter=0; r% ]^(  
 bih.biYPelsPerMeter=0; a\m@I_r.N  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JQ.w6aE  
 static int filecount=0; QX j4cg  
 CString name; w$5#jJX\  
 name.Format("pict%04d.bmp",filecount++); 3d|n\!1r  
 name=m_Path+name; :. ja~Q  
 BITMAPFILEHEADER bfh; <MH| <hP  
 bfh.bfReserved1=bfh.bfReserved2=0; 0au\X$)Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cp7Rpqg  
 bfh.bfSize=54+size; 4uG:*0{Yx  
 bfh.bfOffBits=54; Nn;p1n dN  
 CFile bf; ' cx&:s  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ g5*Zg_G/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7Ed6o  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p;VHg  
  bf.WriteHuge(lpData,size); L3g}Z1<!$  
  bf.Close(); s!d"(K9E  
  nCount++; 4d*=gy%  
 } Jj$N3UCg7  
 GlobalFreePtr(lpData); ch%-Cg~%  
 if(nCount==1) ~~_!&  
  m_Number.Format("%d picture captured.",nCount); DxLN{g]B  
 else pkR+H|  
  m_Number.Format("%d pictures captured.",nCount); C r~!N|(  
  UpdateData(FALSE); ,!RbFME&H  
} P|Ojt I  
,^UNQO*{GI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mzl %h[9iI  
{ SH/KC  
 if(pMsg -> message == WM_KEYDOWN) 8[|RsM   
 { )./%/ _*K  
  if(pMsg -> wParam == VK_ESCAPE) i2EXE0;  
   return TRUE; xN +j]L C  
  if(pMsg -> wParam == VK_RETURN) hK t c  
   return TRUE; ~#b&UR  
 } .WR+)^&zz  
 return CDialog::PreTranslateMessage(pMsg); 5)MVkJ=R  
} k-b0Eogp]  
2vit{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) PfI~`ke  
{ buRK\C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y0R5YCq\":  
  SaveBmp(); t(|\3$z  
  return FALSE; x]gf3Tc58  
} EfR3$sp  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ V.RG= TVS  
 CMenu pop; ;@$B{/Q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %y/8i%@6  
 CMenu*pMenu=pop.GetSubMenu(0); #*[G,s#t^  
 pMenu->SetDefaultItem(ID_EXITICON); 5mD]uB9  
 CPoint pt; vbeYe2;(  
 GetCursorPos(&pt); xJ|3}o:,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); E r6'Ig|U  
 if(id==ID_EXITICON) hYS*J908  
  DeleteIcon();  ?vgHu  
 else if(id==ID_EXIT) :Z@!*F  
  OnCancel(); S;vE %  
 return FALSE; Z[DiLXHL  
} ;c'9Xyl-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1R1DK$^c  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +a%Vp!y  
 AddIcon(); mE"?{~XVL  
 return res; :n:Gr?  
} j#TtY|Po  
+K3SAGm  
void CCaptureDlg::AddIcon() /=zzym~<>  
{ S?bG U8R5  
 NOTIFYICONDATA data; Zjz< Q-  
 data.cbSize=sizeof(NOTIFYICONDATA); do2~LmeW  
 CString tip; s:j"8ZH  
 tip.LoadString(IDS_ICONTIP); m8q3Pp  
 data.hIcon=GetIcon(0); 7[wHNJ7)r  
 data.hWnd=GetSafeHwnd(); |Go?A/'  
 strcpy(data.szTip,tip); qFo'"z`84  
 data.uCallbackMessage=IDM_SHELL; 5V5E,2+ 0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,haCZH {  
 data.uID=98; 9Se7 1  
 Shell_NotifyIcon(NIM_ADD,&data); ^ $M@yWX6  
 ShowWindow(SW_HIDE); HeagT(rN'  
 bTray=TRUE; K; 7o+Xr  
} (LW4z8e#  
0ivlKe%  
void CCaptureDlg::DeleteIcon() ^<8 c`k )e  
{ qsjTo@A  
 NOTIFYICONDATA data; m]yt6b4  
 data.cbSize=sizeof(NOTIFYICONDATA); FF"6~  
 data.hWnd=GetSafeHwnd(); . mDh9V5  
 data.uID=98; _R!KHi  
 Shell_NotifyIcon(NIM_DELETE,&data); x<'(b7{U0  
 ShowWindow(SW_SHOW); k\T,CZ<  
 SetForegroundWindow(); }*{@-v|_R  
 ShowWindow(SW_SHOWNORMAL); "#4p#dM0e  
 bTray=FALSE; 8KioL{h  
} N`tBDl"ld  
c$)Y$@D  
void CCaptureDlg::OnChange() Jl^Rz;bQ-  
{ x(/KHpSWK  
 RegisterHotkey(); h)EHaaf  
} SCClD6k=V  
[b: $sR;  
BOOL CCaptureDlg::RegisterHotkey() ~RV>V*l  
{ } PD]e*z{Z  
 UpdateData(); "p43#  
 UCHAR mask=0; ESk<*-  
 UCHAR key=0; lF]cUp#<  
 if(m_bControl) U2*g9Es  
  mask|=4; ?*}^xXI/  
 if(m_bAlt) /P*mF^Y  
  mask|=2; U!E   
 if(m_bShift) SMr ]Gf.  
  mask|=1; i2ap]  
  key=Key_Table[m_Key.GetCurSel()]; 4WV'\R+m  
 if(bRegistered){ W ?;kMGW-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); UXz0HRRS0  
  bRegistered=FALSE; B!|<<;Da6  
 } ~c>*3*  
 cMask=mask; -jc8ku3*  
 cKey=key; (3YI>/#  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^`Tns6u>  
 return bRegistered; ~c~$2Xo  
} T~%}(0=m  
=9UR~-`d\  
  四、小结 3s iWq9 .  
 rO]7 g  
  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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