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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: .E4* >@M5  
  i5,iJe0cA  
  一、实现方法 TdtV (  
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  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: +v Bi7#&  
g3R(,IH  
#pragma data_seg("shareddata") Syk)S<  
HHOOK hHook =NULL; //钩子句柄 \Wbmmd}8  
UINT nHookCount =0; //挂接的程序数目 TT$A o  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 FFHq':v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :^;c(>u{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey R.~[$G!  
static int KeyCount =0; D /eH~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9!FX *}dC  
#pragma data_seg() jr6_|(0 i6  
)vp0X\3q`  
  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。 v+c>iI  
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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: %uW  =kr  
gP^2GnjHL8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hHs/Qtq  
cKey,UCHAR cMask) #6`5-5Ks;  
{ P3M$&::D-  
 BOOL bAdded=FALSE; Fn4v/)*H  
 for(int index=0;index<MAX_KEY;index++){ 04a ^jjc  
  if(hCallWnd[index]==0){ aSL`yuXu  
   hCallWnd[index]=hWnd; JF~i.+{ h  
   HotKey[index]=cKey; u-_r2U  
   HotKeyMask[index]=cMask; Gp"GTPT{  
   bAdded=TRUE; ?J}Q&p.  
   KeyCount++; $( hT{C,K  
   break; )>volP  
  } lj4Fg*/Yn  
 } v4$/LUJZp  
 return bAdded; 5]xuU.w'  
} )uPJ? 2S9  
//删除热键 d,<ni"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NBikYxa  
{ .~z'm$s1o  
 BOOL bRemoved=FALSE; 96=<phcwN[  
 for(int index=0;index<MAX_KEY;index++){ gI+8J.AG=  
  if(hCallWnd[index]==hWnd){ FG?Mc'r&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fi+}hGj(r  
    hCallWnd[index]=NULL; .[|UNg  
    HotKey[index]=0; .l}Ap7@  
    HotKeyMask[index]=0; H4/wO  
    bRemoved=TRUE; <izQ]\kL  
    KeyCount--; .;#T<S "  
    break; 6j#JhcS+  
   } d2\ !tJm  
  } Ni$'# W?t  
 } Epzg|L1)  
 return bRemoved; f?3-C8 hU  
} NOb`)qb  
"oP^2|${  
T j$'B[cv  
  DLL中的钩子函数如下: !avol/*  
9&mSF0q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bO~y=Pa \  
{ mHD_cgKN  
 BOOL bProcessed=FALSE; WT *"V<Z  
 if(HC_ACTION==nCode) J-W9Bamx  
 { ^-o{3Q(w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /:dLqyQ_V  
   switch(wParam) }nmlN  
   {  m</m9h8  
    case VK_MENU: b@CB +8 $  
     MaskBits&=~ALTBIT; n1[c\1   
     break; t],a1I.gk  
    case VK_CONTROL: )"?4d[ 5  
     MaskBits&=~CTRLBIT; SV7;B?e%Y  
     break; ( ?FH`<  
    case VK_SHIFT: m/HT3<F  
     MaskBits&=~SHIFTBIT; N?GTfN  
     break; <-lM9}vd  
    default: //judge the key and send message STKL  
     break; \Z{tC$|H  
   } uvys>]+  
   for(int index=0;index<MAX_KEY;index++){ iP:i6U]  
    if(hCallWnd[index]==NULL) |vI*S5kn6A  
     continue; KE?t?p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,'L>:pF3  
    { PyeNu3Il4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @"w4R6l+*  
     bProcessed=TRUE; CH++3i2&  
    } *TOdIq&z  
   } C@M-_Ud>Q  
  } 8%rD/b6`  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,67Q!/O  
   switch(wParam) A40DbD\^ad  
   { ('J/Ww<  
    case VK_MENU: o3WOp80hz  
     MaskBits|=ALTBIT; ChBf:`e  
     break; >P6"-x,["  
    case VK_CONTROL: oFk2y^>u  
     MaskBits|=CTRLBIT; "N4^ ^~s  
     break; XF`2*:7  
    case VK_SHIFT: P^Hgm  
     MaskBits|=SHIFTBIT; h]7_ N,  
     break; c:Ua\$)u3,  
    default: //judge the key and send message 2+]5}'M  
     break; ,EqQU|  
   } *v<f#hB"  
   for(int index=0;index<MAX_KEY;index++){ HU0.)tD  
    if(hCallWnd[index]==NULL) #G9 W65f  
     continue; sz7*x{E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kc'$4 J4Tw  
    { ! j~wAdHk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DP_b9o \5  
     bProcessed=TRUE; L!f~Am:#  
    } vHaM yA-  
   } Bfb~<rs[  
  } ct+F\:e  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6)[moR{N1  
   for(int index=0;index<MAX_KEY;index++){ Iu'9yb  
    if(hCallWnd[index]==NULL) iUkUo x  
     continue; srS!X$cec  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Bwg(f_[1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?G{0{ c2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 UB~K/r`.|  
   } HZrA}|:h  
  } 6@]o,O  
 } 44CZl{pt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |mT%IR  
} ]2zM~  
c!w[)>v  
  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: =<\22d5L  
X G#?fr}L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^}  {r@F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !Uiq3s`1T  
B>{%$@4  
  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: 74^v('-2  
jUT`V ZK4&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'O a3 6@  
{ Y e0,0Fpw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _\AQJ?< M  
 { !ooi.Oz*Tu  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~EtGR # N  
  SaveBmp(); i)l0[FNI}  
  return FALSE; WcmX"{  
 } # epP~J_f  
 …… //其它处理及默认处理 b'wy{~l@  
} D:`Q\za  
{S0-y  
$Sc_E:`]  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 1dvP2E  
bQD8#Ml1  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [ G 9Pb)  
wx-\@{E  
  二、编程步骤 Xg~9<BGsi  
stiF`l  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; RvG=GJJ9  
EPE_2a}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; j_C"O,WS  
Nuqmp7C  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; eA N{BPN [  
c0wLc,)G  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !'_7MM  
R*GBxJaw  
  5、 添加代码,编译运行程序。 &JX<)JEB=<  
X~IilGL8:  
三、程序代码 zk<V0NJIL*  
stG +4w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Cm;cmPPl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %OoH<\w w  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ RUY7Y?  
#if _MSC_VER > 1000 O=__w *<  
#pragma once G#[A'tbKk  
#endif // _MSC_VER > 1000 *iB&tWv  
#ifndef __AFXWIN_H__ eb7UA=[Z  
#error include 'stdafx.h' before including this file for PCH {Q>OZm\+  
#endif A=kOSq 4Q  
#include "resource.h" // main symbols 2]kGDeSr  
class CHookApp : public CWinApp k"#gSCW$  
{ n1%2 sV)>  
 public: /<_!Gz.@uG  
  CHookApp(); WIU]>_$.  
  // Overrides BP..p ^EPN  
  // ClassWizard generated virtual function overrides 75a3hPCZ  
  //{{AFX_VIRTUAL(CHookApp) x[mz`0  
 public: h: yJ  
  virtual BOOL InitInstance(); aV5M}:D  
  virtual int ExitInstance(); a~Dk@>+P>  
  //}}AFX_VIRTUAL `h'+4  
  //{{AFX_MSG(CHookApp) /KvJjt'8  
  // NOTE - the ClassWizard will add and remove member functions here. _Q:z -si  
  // DO NOT EDIT what you see in these blocks of generated code ! OUWK  
  //}}AFX_MSG brp3xgQ`]  
  DECLARE_MESSAGE_MAP() DpggZ|J  
}; )bM,>x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); RP$u/x"b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '( I0VJJ   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UvGxA[~2+  
BOOL InitHotkey(); 9mxg$P4  
BOOL UnInit(); 7:B/ ?E  
#endif 3;buC|ky  
A+^okT37r  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. m 3UK`~ji  
#include "stdafx.h" M|c_P)7ym  
#include "hook.h" {9(0s| pr  
#include <windowsx.h> -ED} 6E  
#ifdef _DEBUG (F^R9G|  
#define new DEBUG_NEW dC,C[7\  
#undef THIS_FILE 5r)8MklZ  
static char THIS_FILE[] = __FILE__; R?u(aY)P  
#endif a/ uo)']B  
#define MAX_KEY 100 X<5fn+{]S:  
#define CTRLBIT 0x04 MWme3u)D  
#define ALTBIT 0x02 dnomnY(*<  
#define SHIFTBIT 0x01 *%/O (ohs@  
#pragma data_seg("shareddata") zG$5g^J  
HHOOK hHook =NULL; t Cb34Wpf  
UINT nHookCount =0; n UmyPQ~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  <O7!(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c2 NB@T9'v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =/K)hI!u  
static int KeyCount =0; H.ZF~Yu w  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift inh:b .,B  
#pragma data_seg() TC-Vzk G|  
HINSTANCE hins; 0GxJja  
void VerifyWindow(); ;N#}3lpLqg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \dJhDR  
//{{AFX_MSG_MAP(CHookApp) T; tY7;<  
// NOTE - the ClassWizard will add and remove mapping macros here. N&   
// DO NOT EDIT what you see in these blocks of generated code! 7;|"1H:cmw  
//}}AFX_MSG_MAP :pM 8Q1:B  
END_MESSAGE_MAP() JXL?.{'A  
E"9(CjbQ[  
CHookApp::CHookApp() \(Oc3+n6  
{ 7f+@6jqD\)  
 // TODO: add construction code here, 0)SRLHTY%  
 // Place all significant initialization in InitInstance dV[G-p  
} <oJ?J^  
t$du|q(  
CHookApp theApp; #w.0Cc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hu$eO'M_  
{ >%;i@"  
 BOOL bProcessed=FALSE; Xk.OyQ@  
 if(HC_ACTION==nCode) `E1G9BbU  
 { C jf<,x$  
  if((lParam&0xc0000000)==0xc0000000){// Key up 27 XM&ZrZ  
   switch(wParam) q;bw }4  
   { MlYm\x8{M  
    case VK_MENU: (1|wM+)"  
     MaskBits&=~ALTBIT; `bBkPH}M  
     break; \}4Y]xjV2  
    case VK_CONTROL: 61Cc? a*_  
     MaskBits&=~CTRLBIT; /i8OyRpSyk  
     break; b 9rQQS  
    case VK_SHIFT: &V1d"";SZ  
     MaskBits&=~SHIFTBIT; vD@|]@gq  
     break; 4/~x+tdc  
    default: //judge the key and send message Jy/< {7j  
     break; i#>t<g`l  
   } ^85Eveu  
   for(int index=0;index<MAX_KEY;index++){ Soq#cl'll-  
    if(hCallWnd[index]==NULL)  nBp6uNK[  
     continue; rwJ U;wy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /%g9g_rt#  
    { \_O#M   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "<+~uz  
     bProcessed=TRUE; hy~[7:/<I&  
    } %IBT85{  
   } _U&HXQ8X  
  } !b_(|~7Lc  
  else if((lParam&0xc000ffff)==1){ //Key down ["f6Ern  
   switch(wParam) w[d8#U   
   { wr"0+J7  
    case VK_MENU: |P]W#~Y-  
     MaskBits|=ALTBIT; }O7sP^  
     break; we[+6Z6J  
    case VK_CONTROL: D(ItNMc Ku  
     MaskBits|=CTRLBIT; =s":Mx,o  
     break; rlR!Tc>  
    case VK_SHIFT: />mK.FT  
     MaskBits|=SHIFTBIT; "'bl)^+?,  
     break; YA,~qT|  
    default: //judge the key and send message Qu[QcB{ro-  
     break; j~>{P=_}  
   } vN^.MR+<  
   for(int index=0;index<MAX_KEY;index++) ~D3 S01ecM  
   { "7y, d%H  
    if(hCallWnd[index]==NULL) 2|^@=.4\  
     continue; pDlrK&;\z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z*h:Nt%.  
    { 2j8GJU/L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iH4LZ  
     bProcessed=TRUE; uCr& `  
    } BJwuN  
   } _M/N_Fm  
  } #?w07/~L  
  if(!bProcessed){ .2c/V  
   for(int index=0;index<MAX_KEY;index++){ 5?;<^J  
    if(hCallWnd[index]==NULL) 3!l>\#q6  
     continue; xx!8cvD4?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) SPE)db3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "jyo'r  
   } D<69xT,  
  } _l9fNf!@  
 } W"Y)a|rG%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); y@7fR9hp<  
} I9 zs  
A]!0Z:{h%  
BOOL InitHotkey() N\*oL*[j  
{ <b H *f w  
 if(hHook!=NULL){ ,e43m=KhK  
  nHookCount++; 'Wnh1|z  
  return TRUE; $ 6mShp9(  
 } *@''OyL  
 else r\Y,*e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |gI>Sp%Fu  
  if(hHook!=NULL) pFS@yHs  
   nHookCount++; Uo >aQk  
  return (hHook!=NULL); $x'jf?zs!  
} pL1ABvBB  
BOOL UnInit() 9k ~8n9  
{ FzX ;~CA  
 if(nHookCount>1){ ?pZU'5le`  
  nHookCount--; 4,LS08&gh  
  return TRUE; _jG|kjFTc  
 } :Q DkaA  
 BOOL unhooked = UnhookWindowsHookEx(hHook); B za<.E=  
 if(unhooked==TRUE){ 9SsVJ<9,R  
  nHookCount=0; 1"Oe*@`pV  
  hHook=NULL; |1!fuB A  
 } T;(,9>Qsu  
 return unhooked; pYQSn.`V~  
} Ob]\t/:%P  
+8zACs{p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m8F$h-  
{ ]|g2V a~-  
 BOOL bAdded=FALSE; "}Om0rB}1  
 for(int index=0;index<MAX_KEY;index++){ @>O7/d?O  
  if(hCallWnd[index]==0){ !6=s{V&r1  
   hCallWnd[index]=hWnd; 8_!qoW@B  
   HotKey[index]=cKey; Eh8GqFEM  
   HotKeyMask[index]=cMask; Oh1U=V2~  
   bAdded=TRUE; CmBP C jh  
   KeyCount++; $/"Ymm#"\Y  
   break; P1[.[q/-e  
  } A^,u l>!  
 } ;xiN<f4B  
 return bAdded; n )X%&_  
} THq}>QI  
(E0WZ $f}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \(Rj2  
{ V]--d33/a  
 BOOL bRemoved=FALSE; ?MFC(Wsh  
 for(int index=0;index<MAX_KEY;index++){ ]\fHc"/  
  if(hCallWnd[index]==hWnd){ 8i] S[$Fc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mH$`)i8  
    hCallWnd[index]=NULL; ,]0BmlD  
    HotKey[index]=0; L;:PeYPL  
    HotKeyMask[index]=0; Jf2JGTcm  
    bRemoved=TRUE; JvXuN~fI{[  
    KeyCount--; ,Dv*<La`\  
    break; t+A*Ws*o  
   } OSO MFt  
  } =M?+KbTJ3  
 } Wy-_}wqHg  
 return bRemoved; ef*Z;HI0  
} 'yH  
f`ibP6%  
void VerifyWindow() RDSC@3%  
{ !4cCq_  
 for(int i=0;i<MAX_KEY;i++){ 0Md.3kY  
  if(hCallWnd!=NULL){ xT&/xZLT  
   if(!IsWindow(hCallWnd)){ W3/] 2"0  
    hCallWnd=NULL; " l|`LjP5M  
    HotKey=0; *P\lzM  
    HotKeyMask=0; =A,T:!}'  
    KeyCount--; rYt|[Pk  
   } *Jcd_D\-(1  
  } |(tl a_LE  
 } x$jLB&+ICz  
} g \S6>LG!  
L %acsb}  
BOOL CHookApp::InitInstance() j9c:SP5  
{ uDG>m7(}/h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); RU/WI<O  
 hins=AfxGetInstanceHandle(); &&$*MHJ  
 InitHotkey(); !lg_zAV  
 return CWinApp::InitInstance(); pFMJG<W9,  
} sE]z.Po=  
wG:RvgX}  
int CHookApp::ExitInstance() zytW3sTZA  
{ >P(.yQ8&kL  
 VerifyWindow(); %ho?KU2j  
 UnInit(); j/oc+ M^  
 return CWinApp::ExitInstance(); xH28\]F5n  
} xC + >R1)  
7?g({]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /AX)n:,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \5N \NN @J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1k"t[^  
#if _MSC_VER > 1000 C+!=C{@7di  
#pragma once ~)pZ5%C  
#endif // _MSC_VER > 1000 n=DmdQ}  
PY4">~6\i  
class CCaptureDlg : public CDialog N 49{J~  
{ 1)}hzA  
 // Construction Yt_tAm  
 public: Z8h;3Ek  
  BOOL bTray; ' "%hX&]5  
  BOOL bRegistered; R'F\9eyA  
  BOOL RegisterHotkey(); J7WNgl% u  
  UCHAR cKey; D?xR>Oo)  
  UCHAR cMask; `:ZaT('h  
  void DeleteIcon(); 8:I-?z;S  
  void AddIcon(); X pK eN2=p  
  UINT nCount; YJwI@E(l$  
  void SaveBmp(); YJz06E1 -9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor WuWOC6^  
  // Dialog Data vfDX~_N  
  //{{AFX_DATA(CCaptureDlg) [70 _uq  
  enum { IDD = IDD_CAPTURE_DIALOG }; NU.4_cixb  
  CComboBox m_Key; T{3-H(-gA  
  BOOL m_bControl; }# Ji"e  
  BOOL m_bAlt; IWddJb~hu  
  BOOL m_bShift; #Wl9[W/4  
  CString m_Path; bjwl21;{  
  CString m_Number; `]6W*^'PD  
  //}}AFX_DATA jX$U)O  
  // ClassWizard generated virtual function overrides [ p0_I7  
  //{{AFX_VIRTUAL(CCaptureDlg) P 2x.rukT|  
 public: T-s[na(/L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); g_Y$5ft`  
 protected: MnY}U",   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H%>cpwa[7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %gqu7}'  
  //}}AFX_VIRTUAL }*P;kV  
  // Implementation d_V7w4lK  
 protected: $ JCOL  
  HICON m_hIcon; DoeE=X*`k  
  // Generated message map functions LmROG-9  
  //{{AFX_MSG(CCaptureDlg) apxq] ! `  
  virtual BOOL OnInitDialog(); vHymSU/J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5Yk|  
  afx_msg void OnPaint(); ?[5_/0L,=  
  afx_msg HCURSOR OnQueryDragIcon(); )q{e L$  
  virtual void OnCancel(); M}" KAa  
  afx_msg void OnAbout(); 9M[   
  afx_msg void OnBrowse(); R|O^7o  
  afx_msg void OnChange(); 2+YM .Zl  
 //}}AFX_MSG {4R;C~E8  
 DECLARE_MESSAGE_MAP() #@M'*X_%}K  
}; V8%( h[  
#endif Zqg AgN@  
_(@ezX.p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'Hq#9?<2M  
#include "stdafx.h" >hotkMX `3  
#include "Capture.h" Oh=Kl3xs  
#include "CaptureDlg.h" c<)O#i@3/  
#include <windowsx.h> C !Lu`y  
#pragma comment(lib,"hook.lib") w^ 8^0i-  
#ifdef _DEBUG nhq,Y0YH  
#define new DEBUG_NEW eGrxS;NY  
#undef THIS_FILE Xr|e%]!**  
static char THIS_FILE[] = __FILE__; h4>q~&Pd  
#endif Y-"7R>^I  
#define IDM_SHELL WM_USER+1 7I@@}A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `v Ebm Xb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .uo:fxbd2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &nn+X%m9g  
class CAboutDlg : public CDialog 5[+E?4,&  
{ x@VZJrQQ  
 public: N2EX`@_2  
  CAboutDlg(); PrEfJ?  
  // Dialog Data sGbk4g  
  //{{AFX_DATA(CAboutDlg) _7-P8"m  
  enum { IDD = IDD_ABOUTBOX }; w}(Ht_6q{  
  //}}AFX_DATA }~NWOJ3;  
  // ClassWizard generated virtual function overrides  {0} Q5  
  //{{AFX_VIRTUAL(CAboutDlg) R8u9tTW  
 protected: 7/c9azmC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \v.YP19  
  //}}AFX_VIRTUAL .t%` "C  
  // Implementation <:0d%YB)  
 protected: lz0'E'%{P  
  //{{AFX_MSG(CAboutDlg) E K^["_*A  
  //}}AFX_MSG u6p nO  
  DECLARE_MESSAGE_MAP() LsV?b*^(p  
}; sC RmLUD  
bdyE9t   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HNL;s5gq  
{ P/~kX_  
 //{{AFX_DATA_INIT(CAboutDlg) 8IihG \  
 //}}AFX_DATA_INIT zJtB?<  
} ~VO?PfxZ  
:eTzjW=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 'ul~f$ V  
{ (L8z<id<z  
 CDialog::DoDataExchange(pDX); O(44Dy@2  
 //{{AFX_DATA_MAP(CAboutDlg) PqwoZo0j  
 //}}AFX_DATA_MAP %-, -:e  
} ~]lVixr9  
'uV;)~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Eh?,-!SUQn  
 //{{AFX_MSG_MAP(CAboutDlg) C'//(gjQ-G  
 // No message handlers c9xc@G!  
 //}}AFX_MSG_MAP `n`aA)|<  
END_MESSAGE_MAP() <-a6'g2y  
gK"E4{y_@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9iQc\@eGd  
: CDialog(CCaptureDlg::IDD, pParent) rXg#_c5j  
{ b+ v!3|  
 //{{AFX_DATA_INIT(CCaptureDlg) J*'#! xIa  
  m_bControl = FALSE; K.2l)aRd  
  m_bAlt = FALSE; "DNiVL.  
  m_bShift = FALSE; 3SWO_  
  m_Path = _T("c:\\"); [n;GP@A ]R  
  m_Number = _T("0 picture captured."); |R$/oq  
  nCount=0; .UJjB}4$f  
  bRegistered=FALSE;  Wfyap)y  
  bTray=FALSE; M8' GbF=1  
 //}}AFX_DATA_INIT sAU!u  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;b1*2-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); niP/i  
} Sg}]5Mn`  
aJ}Cq k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) FrBJv<  
{ /\1MG>#K  
 CDialog::DoDataExchange(pDX); V9i[ dF  
 //{{AFX_DATA_MAP(CCaptureDlg) _^pg!j[Fy}  
  DDX_Control(pDX, IDC_KEY, m_Key); =M+enSu  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); zkRL'-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `$, \B  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QO%#.s  
  DDX_Text(pDX, IDC_PATH, m_Path); ~Uw<E:?v  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~$3X>?Q  
 //}}AFX_DATA_MAP V$XCe  
} cu V}<3&  
8'X:}O/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [>tyx{T Ye  
//{{AFX_MSG_MAP(CCaptureDlg) D%k]D/  
 ON_WM_SYSCOMMAND() Z39I*-6F9W  
 ON_WM_PAINT() {:r8X  
 ON_WM_QUERYDRAGICON() c'r7sI%Yi  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qdeS*r p\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -P>f2It  
 ON_BN_CLICKED(ID_CHANGE, OnChange) w- .=u3  
//}}AFX_MSG_MAP m"Y|xvIA  
END_MESSAGE_MAP()  B Ji  
2K1odqO#   
BOOL CCaptureDlg::OnInitDialog() 2m/=0sb\{  
{ 'v*Y7zZ#K  
 CDialog::OnInitDialog(); .U:DuyT  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [J.-gN$X@  
 ASSERT(IDM_ABOUTBOX < 0xF000); hhVyz{u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m;"i4!  
 if (pSysMenu != NULL) =9ISsI\Y6  
 { D.\s mk  
  CString strAboutMenu; K6Gri>Um  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fhZD#D  
  if (!strAboutMenu.IsEmpty()) ;0f?-W?1  
  { 3Vj,O?(Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); On{p(| l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (X"WEp^Q{I  
  } Kqt,sJ  
 } ^K K6 d  
 SetIcon(m_hIcon, TRUE); // Set big icon a:(.{z?nM  
 SetIcon(m_hIcon, FALSE); // Set small icon s1eGItx[w  
 m_Key.SetCurSel(0); g :me:M  
 RegisterHotkey(); 5-ju5z?=  
 CMenu* pMenu=GetSystemMenu(FALSE); c_xo6+:l  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .v3~2r*&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &_EjP hZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nUL8*#p-  
 return TRUE; // return TRUE unless you set the focus to a control s2-p -n  
} cH!w;U b]  
{)QSxO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) noBGP/Av=:  
{ 7EKQE>xj  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ? }2]G'7?  
 { ;*Cu >f7  
  CAboutDlg dlgAbout; 0{P Rv./`  
  dlgAbout.DoModal(); p/a)vN+*x'  
 } V@xlm h,  
 else Nuw_,-h  
 { Y4 Y;xK"  
  CDialog::OnSysCommand(nID, lParam); :u7y k@  
 } uZ-yu|1  
} t9zF WdW  
j'V# =vH  
void CCaptureDlg::OnPaint() 9Xg+$/  
{ 4ISZyO=  
 if (IsIconic()) 5Y\wXqlY  
 { <XV\8Y+n  
  CPaintDC dc(this); // device context for painting d+Vx:`tT  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :{d?B$  
  // Center icon in client rectangle nSL x1Q  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4$=Dq$4z  
  int cyIcon = GetSystemMetrics(SM_CYICON); wh\J)pA1  
  CRect rect; $~V,.RD  
  GetClientRect(&rect); I3A@0'Vm;L  
  int x = (rect.Width() - cxIcon + 1) / 2; Rmrv@.dr!  
  int y = (rect.Height() - cyIcon + 1) / 2; >!vb;a!  
  // Draw the icon B!=JRf T  
  dc.DrawIcon(x, y, m_hIcon); y/ #{pyJ  
 } *jps}uk<  
 else Vn`-w  
 { mE"?{~XVL  
  CDialog::OnPaint(); szY=N7\S*  
 } :h>d'+\  
} \B'rWk 33,  
AiT&:'<UT  
HCURSOR CCaptureDlg::OnQueryDragIcon() (1r.AG`g  
{ Khbkv  
 return (HCURSOR) m_hIcon; ab1qcQ<  
} EPQ~V  
R(c:#KF#8  
void CCaptureDlg::OnCancel() d85\GEF9i  
{ ?t&sT  
 if(bTray) 38wt=0br  
  DeleteIcon(); `3Gjj&c  
  CDialog::OnCancel(); %d5;JEgA:g  
} LeA=*+zP[  
a$7}_kb  
void CCaptureDlg::OnAbout() LCrE1Q%VP  
{ vxxa,KR/y  
 CAboutDlg dlg; ?d*0-mhQ,  
 dlg.DoModal(); f&w8o5=|I  
} w7H.&7rF  
^rI<}cfR  
void CCaptureDlg::OnBrowse() .:KZ8'g3}  
{ g.v)qB  
 CString str; nwk66o:|  
 BROWSEINFO bi; >9o(84AxIH  
 char name[MAX_PATH]; /qW5M4.w  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $td=h)S^`  
 bi.hwndOwner=GetSafeHwnd(); 18|i{fE;  
 bi.pszDisplayName=name; ;* vVucx  
 bi.lpszTitle="Select folder"; zDbjWd  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1sL#XB$@N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6t0!a@t  
 if(idl==NULL) %-y%Q.;k ?  
  return; %ec9`0^4S  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (o/HLmr@Y  
 str.ReleaseBuffer(); S~QL x  
 m_Path=str; x~Eg ax  
 if(str.GetAt(str.GetLength()-1)!='\\') m@hmu}qz-  
  m_Path+="\\"; WKf->W  
 UpdateData(FALSE); K|-?1)Um  
} pSQ)DqW  
=)Cqjp  
void CCaptureDlg::SaveBmp() ffuV158a&  
{ PQ`p:=~>:i  
 CDC dc; (vCMff/ Y1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %[:\ZwT,-  
 CBitmap bm; 03ol!|X "9  
 int Width=GetSystemMetrics(SM_CXSCREEN); yub|   
 int Height=GetSystemMetrics(SM_CYSCREEN); |kwBb>V  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5cbtMNP  
 CDC tdc; $EjM )  
 tdc.CreateCompatibleDC(&dc); olNgtSX  
 CBitmap*pOld=tdc.SelectObject(&bm); T~%}(0=m  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =9UR~-`d\  
 tdc.SelectObject(pOld); 3s iWq9 .  
 BITMAP btm;  rO]7 g  
 bm.GetBitmap(&btm); ;-=Q6Ms8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; vc.:du  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -2}-;|  
 BITMAPINFOHEADER bih; lW^bn(_gQ  
 bih.biBitCount=btm.bmBitsPixel; \Kph?l9Ww  
 bih.biClrImportant=0; gC81ICM  
 bih.biClrUsed=0; \ltA&}!  
 bih.biCompression=0; [|ghq  
 bih.biHeight=btm.bmHeight; -@49Zh2'  
 bih.biPlanes=1; D-8N Da(`  
 bih.biSize=sizeof(BITMAPINFOHEADER); P"dWh;I_  
 bih.biSizeImage=size; 5"4O_JQ  
 bih.biWidth=btm.bmWidth; 5T?esF<  
 bih.biXPelsPerMeter=0; MTZbRi6z  
 bih.biYPelsPerMeter=0; $sDvE~f0n  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N;cEf7+f  
 static int filecount=0; ]UG+<V ,:  
 CString name; ]Mu + DZ  
 name.Format("pict%04d.bmp",filecount++); 8r^~`rL  
 name=m_Path+name; pyEi@L1p  
 BITMAPFILEHEADER bfh; T:ye2yg  
 bfh.bfReserved1=bfh.bfReserved2=0; /"A)}>a  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S/}6AX#F4  
 bfh.bfSize=54+size; :DP%>H|  
 bfh.bfOffBits=54; :3k&[W*  
 CFile bf; o8+ZgXct  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t?NB#/#%x  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %vjLw`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Mg H,"G  
  bf.WriteHuge(lpData,size); (?SK< 4!  
  bf.Close(); !r:X`~\a  
  nCount++; t.sbfLu  
 } =`f6@4H  
 GlobalFreePtr(lpData); Y>KRI2](<  
 if(nCount==1) ]C |Zs=5  
  m_Number.Format("%d picture captured.",nCount); ng]jpdeA  
 else MWv_BXQ  
  m_Number.Format("%d pictures captured.",nCount); s#,~Zb=  
  UpdateData(FALSE); w ^ v*1KA&  
} 2Yd0:$a  
t+'|&b][Qi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) c@RMy$RTF  
{ $x,?+N  
 if(pMsg -> message == WM_KEYDOWN) i>!7/o  
 { [6@{^  
  if(pMsg -> wParam == VK_ESCAPE) (pBOv:6  
   return TRUE; i"=6n>\  
  if(pMsg -> wParam == VK_RETURN) 1O bxQ_x  
   return TRUE; Sa!r ,l  
 } ]3@6o*R;  
 return CDialog::PreTranslateMessage(pMsg); D}|PBR  
} bWzv7#dd=  
z=TaB^-)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) # Ny  
{ WVc3C-h,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v?zA86d_  
  SaveBmp(); xaO9?{O  
  return FALSE; TJ@@k SSbl  
} ZhqrN]x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rzJNHf=FVY  
 CMenu pop; =5NrkCk#V  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @OOnO+g  
 CMenu*pMenu=pop.GetSubMenu(0); 7n*,L5%?]4  
 pMenu->SetDefaultItem(ID_EXITICON); 9-;ujl?{  
 CPoint pt; R<VNbm;  
 GetCursorPos(&pt); -.A%c(|Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .Ap-<FB  
 if(id==ID_EXITICON) 5~T`R~Uqb  
  DeleteIcon(); BKDs3?&  
 else if(id==ID_EXIT) {9sA'5  
  OnCancel(); )Lht}I ]:  
 return FALSE; I`"8}d@Jm  
} J+f .r|?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rj qX|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ju3-ZFUS4  
 AddIcon(); "0o1M\6Z  
 return res; fj X~"U  
} >jEn>H?  
Xz)UH<  
void CCaptureDlg::AddIcon() 'Eds0"3  
{ -x~h.s,  
 NOTIFYICONDATA data; Xg:w;#r,  
 data.cbSize=sizeof(NOTIFYICONDATA); _jK    
 CString tip; zoXCMBg[  
 tip.LoadString(IDS_ICONTIP); h&eu}aF  
 data.hIcon=GetIcon(0); x\t)uM%  
 data.hWnd=GetSafeHwnd(); dkTj KV  
 strcpy(data.szTip,tip); T"1H%65`V  
 data.uCallbackMessage=IDM_SHELL; ":E^&yQ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m+p}Qi8i)  
 data.uID=98; \u@4 eBAV  
 Shell_NotifyIcon(NIM_ADD,&data); [(v?Z`cX\  
 ShowWindow(SW_HIDE); %2Q:+6)  
 bTray=TRUE; =;DmD?nZ  
} 2XhtK  
sg"J00  
void CCaptureDlg::DeleteIcon() }:u" ?v=|j  
{ L3:dANG  
 NOTIFYICONDATA data; `ER">@&  
 data.cbSize=sizeof(NOTIFYICONDATA); O+I\Q?   
 data.hWnd=GetSafeHwnd(); +jzwi3B`  
 data.uID=98; O]{3aMs!Y  
 Shell_NotifyIcon(NIM_DELETE,&data); VU+`yQp  
 ShowWindow(SW_SHOW); $0WO 4C%M  
 SetForegroundWindow(); 68ce+|  
 ShowWindow(SW_SHOWNORMAL); f8`K8Y]4  
 bTray=FALSE; ,at"Q$)T  
} n< UuVu  
,KvF:xqA  
void CCaptureDlg::OnChange() Uc,D&Og  
{ 6^U8Utx  
 RegisterHotkey(); _DPWp,k<~  
} ylm*a74-X  
i oX [g  
BOOL CCaptureDlg::RegisterHotkey() Y<('G5A  
{ 6<sd6SM  
 UpdateData(); PW(4-H  
 UCHAR mask=0; 1iWo* +5  
 UCHAR key=0;  W7I.S5  
 if(m_bControl) o>rsk 6lNi  
  mask|=4; :3`6P:^  
 if(m_bAlt) C/Vs+aW n  
  mask|=2; Q 6djfEN>  
 if(m_bShift) OiI[w8  
  mask|=1; #<ppiu$  
  key=Key_Table[m_Key.GetCurSel()]; r|$@Wsb?#  
 if(bRegistered){ ~(E.$y7P  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }{>)2S  
  bRegistered=FALSE; j8p</gd  
 } qfp,5@p  
 cMask=mask; b&:>v9U  
 cKey=key; +a$'<GvP  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #/fh_S'Z  
 return bRegistered; O~t]:p9_  
} `.3!  
kO:|?}Koc  
  四、小结 d-e6hI4b  
b-pZrnZ!  
  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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