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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:  x9 <cT'  
  ;*+jCL 2F  
  一、实现方法 /+Xv( B  
?T70C9  
  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: }7vX4{Yn  
@q2Yka  
#pragma data_seg("shareddata") `Y/DttjL  
HHOOK hHook =NULL; //钩子句柄 )oa6;=go  
UINT nHookCount =0; //挂接的程序数目 &&|*GAjJ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B[Uvj~g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0W9,uC2:N  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;|b D@%@  
static int KeyCount =0; 4_`+&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .-[UHO05^8  
#pragma data_seg() *:3flJt  
y-{^L`%Mk  
  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。 GLt#]I"LY  
j"/i+r{"E  
  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: cI'&gT5  
on+ c*#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <r,l  
cKey,UCHAR cMask) 4W~pAruwr  
{ 9rtcI[&?0  
 BOOL bAdded=FALSE; $ W(m  
 for(int index=0;index<MAX_KEY;index++){ &?/h#oF@\  
  if(hCallWnd[index]==0){ #Z}\;a{vZ  
   hCallWnd[index]=hWnd; d$kGYMT"  
   HotKey[index]=cKey; s*:J=+D]G  
   HotKeyMask[index]=cMask; "W|Sh#JF  
   bAdded=TRUE; 3IZ^!J  
   KeyCount++; mTW0_!.  
   break; $TL~SVHj;{  
  } kh 1 7  
 } ~ DVAk|fc  
 return bAdded; g% #" 5Kr  
} >tqLwC."'  
//删除热键 2IqsBK`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F>)u<f,C  
{ 93[c^sc9*a  
 BOOL bRemoved=FALSE; v$w!hYsQ  
 for(int index=0;index<MAX_KEY;index++){ h2!We#  
  if(hCallWnd[index]==hWnd){ ]6p?mBuQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kp[+Iun?  
    hCallWnd[index]=NULL; G#8HY VF  
    HotKey[index]=0; qn6Y(@<[  
    HotKeyMask[index]=0; f$NudG!S  
    bRemoved=TRUE; [(w _!|S  
    KeyCount--; ^/2n[orl5  
    break; P6zy<w  
   } V(A6>0s$|  
  } d /jO~+jP  
 } y1(smZU  
 return bRemoved; $985q@pV0  
} 0Oc' .E9  
9@#Z6[=R,  
u}JL*}Q  
  DLL中的钩子函数如下: ^LE`Y>&m  
ngcXS2S_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?3Se=7 k  
{ j>+x|!k  
 BOOL bProcessed=FALSE; +T+f``RcK  
 if(HC_ACTION==nCode) =E8lpN'  
 { pN&5vu30  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Ix^xL+Tm  
   switch(wParam) N' t*eCi  
   {  kz(%8qi8&  
    case VK_MENU: @U_w:Q<9u  
     MaskBits&=~ALTBIT; kV(}45i]s  
     break; 9l@VxX68M  
    case VK_CONTROL: Lf&p2p?~c  
     MaskBits&=~CTRLBIT; ?0WJB[/  
     break; <bWhTNOb  
    case VK_SHIFT: +n%uIv  
     MaskBits&=~SHIFTBIT; m\__Fl  
     break; Z TWbe  
    default: //judge the key and send message '%yWz)P  
     break; s@E "EWp0  
   } 3205gI,  
   for(int index=0;index<MAX_KEY;index++){ K~5QL/=1  
    if(hCallWnd[index]==NULL) G@oY2sM"  
     continue; 3aQWzEnh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :t8(w>oW  
    { h)"PPI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @H"~/m_o  
     bProcessed=TRUE; j08}5Eo  
    } 0"(5\T  
   } G)';ucs:,  
  } Pq>r|/~_  
  else if((lParam&0xc000ffff)==1){ //有键按下 {v}f/ cu  
   switch(wParam) AKC';J  
   { r;t0+aLc*  
    case VK_MENU: .vj`[?T  
     MaskBits|=ALTBIT; E9;cd$}K  
     break; p[VBeO^%  
    case VK_CONTROL: R)"Ds}1G  
     MaskBits|=CTRLBIT; v9( ->X'  
     break; 4*g`!~)  
    case VK_SHIFT: Pdmfn8I]%  
     MaskBits|=SHIFTBIT; :[ m;#b  
     break; (n05MwKu\  
    default: //judge the key and send message D+]#qS1q  
     break; CDQ}C=4  
   } M2(+}gv;7p  
   for(int index=0;index<MAX_KEY;index++){ \]e"#"v}}_  
    if(hCallWnd[index]==NULL) }+h/2D  
     continue; ^I@1y}xi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZWQrG'$?o8  
    { <LIL{g0eX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); UJ 1iXV[h"  
     bProcessed=TRUE; hW$B;  
    } n$g g$<  
   } DnS# cs~  
  } zdrCr0Rx,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &*B=5W;6^u  
   for(int index=0;index<MAX_KEY;index++){ 2--"@@  
    if(hCallWnd[index]==NULL) 3 k py3z[%  
     continue; WLd{+y5#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Fd":\7p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R"EX$Zj^E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Mp^%.m  
   } xAw$bJj~s  
  } I$9^i#O'3  
 } +VkhM;'"C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?D]4*qsIlu  
} Sg(fZ' -  
~^cx a%  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: , \ |S BS  
 jhjb)r.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;|6kFBGC"+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x+x 6F  
+!6aB|-  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: "rOe J~4 X  
JziuwL5,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Lg0Vn&k  
{ o@mZ6!ax3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) K9B_o,  
 { k3h,c;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 l5F>v!NA  
  SaveBmp(); 1Y:lFGoe  
  return FALSE;  h%0/j  
 } "Kx2k>ym  
 …… //其它处理及默认处理 4HQP,  
} hqIYo .<  
_fx0-S*$  
zZ &L#  
  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。 D1o<:jOj  
k #y4pF_  
  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。 ;UTT>j  
REUWK#>  
  二、编程步骤 wYQTG*&h  
mr dG- t(k  
  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"; y! he<4  
r|wB& PGW  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Q?-HU,RBO  
y|f`sBMM  
  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; aG.j0`)%  
2A7g}V  
  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; qq" &Bc>  
6FNs4|(d  
  5、 添加代码,编译运行程序。 9 ?a-1  
dznHR6x  
三、程序代码 WJbdsPs  
?K%&N99c!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c Q:.V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -\6nT'P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]#=43  
#if _MSC_VER > 1000 Y?W"@awE"\  
#pragma once PPSf8-MLW  
#endif // _MSC_VER > 1000 .|[ZEXq  
#ifndef __AFXWIN_H__ EN />f=%  
#error include 'stdafx.h' before including this file for PCH Pz#D9.D0  
#endif eSo/1D  
#include "resource.h" // main symbols [,[;'::=o4  
class CHookApp : public CWinApp "~j SG7h  
{ 0`.3`Mk   
 public: F4'g}y OLd  
  CHookApp(); v'nM=  
  // Overrides ]H<5]({F  
  // ClassWizard generated virtual function overrides &$F4/2|b%  
  //{{AFX_VIRTUAL(CHookApp) 7OY<*ny  
 public: iU3)4(R  
  virtual BOOL InitInstance(); T&Z%=L_Q  
  virtual int ExitInstance(); -6a4H?L  
  //}}AFX_VIRTUAL b* Ny  
  //{{AFX_MSG(CHookApp) to{/@^ D  
  // NOTE - the ClassWizard will add and remove member functions here. eQ _dO]Q  
  // DO NOT EDIT what you see in these blocks of generated code ! sf )ojq6s  
  //}}AFX_MSG 2<HG=iSf  
  DECLARE_MESSAGE_MAP() Z0*Lm+d9z  
}; y57]q#k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); CBw/a0Uck  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EV{kd.=f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c&r8q]u  
BOOL InitHotkey(); 1-[~}  
BOOL UnInit(); gM_z`H 5[!  
#endif mi9BC9W(  
$ZX^JWq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. F F<xsoZJ  
#include "stdafx.h" c@9jc^CJ  
#include "hook.h" "^E/N},%u5  
#include <windowsx.h> PhBdm'  
#ifdef _DEBUG }% (e`[?1  
#define new DEBUG_NEW 7L~LpB  
#undef THIS_FILE E +\?|q !T  
static char THIS_FILE[] = __FILE__; > w:+nG/r  
#endif lg` Qi&  
#define MAX_KEY 100 >;V ? s]  
#define CTRLBIT 0x04 6v~` jS%3  
#define ALTBIT 0x02 y,&.<Yc  
#define SHIFTBIT 0x01 b<,Z^Z_  
#pragma data_seg("shareddata") P \<dy?nZ  
HHOOK hHook =NULL; N2:};a[ui5  
UINT nHookCount =0; `L p3snS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XQL"D)fw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Zwy8 SD'L  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Sh'>5z2  
static int KeyCount =0; rmpx8C Y"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hz#S b~g  
#pragma data_seg() lU]/nKyd  
HINSTANCE hins; L4Ep7=  
void VerifyWindow(); '@enl]J  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) BDoL)}bRE  
//{{AFX_MSG_MAP(CHookApp) +~, qb1aZ  
// NOTE - the ClassWizard will add and remove mapping macros here. 6J. [9#  
// DO NOT EDIT what you see in these blocks of generated code! AQkH3p/W  
//}}AFX_MSG_MAP SN2X{Q|*  
END_MESSAGE_MAP() S~jl%]  
ga0>J_  
CHookApp::CHookApp() iC-WQkQY  
{ N<c98  
 // TODO: add construction code here,  E~oQ%X~  
 // Place all significant initialization in InitInstance Mda~@)7$  
} MQ;c'?!5[!  
tI50z khaB  
CHookApp theApp; *p!K9$4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bz!9\D|h  
{ hKq <e%oVH  
 BOOL bProcessed=FALSE; W\09h Z6  
 if(HC_ACTION==nCode) r~q*E'n  
 { s+Qm/ h2  
  if((lParam&0xc0000000)==0xc0000000){// Key up s@C KZ`  
   switch(wParam) 9L3#aE]C  
   { i8R.Wl$l  
    case VK_MENU: *&p`8:  
     MaskBits&=~ALTBIT; zTi %j$o  
     break; ;)Rvk&J5  
    case VK_CONTROL: 2yqm$i9C  
     MaskBits&=~CTRLBIT; A WlR" p2  
     break; [@D+kL*>  
    case VK_SHIFT: v4]7"7GuW  
     MaskBits&=~SHIFTBIT; Qx,?v|Xg  
     break; V0hC[Ilr  
    default: //judge the key and send message "0Xa?z8"  
     break; Bi?.w5  
   } fsc^8  
   for(int index=0;index<MAX_KEY;index++){ ?D P]#9/4  
    if(hCallWnd[index]==NULL) ;{b 1'  
     continue; $ijWwrh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C6Qnn@waYb  
    { I"awvUP]a[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TTjj.fq6  
     bProcessed=TRUE; Y9F78=Q  
    } SI_{%~k*B  
   } M$O}roOa  
  } $<^4G  
  else if((lParam&0xc000ffff)==1){ //Key down ]'Y vI! r  
   switch(wParam) 0gNwC~IA8  
   { ;)ff Gg>  
    case VK_MENU: K{[ySB  
     MaskBits|=ALTBIT; dRg1I=|{_  
     break; ,aI 6P-  
    case VK_CONTROL: #;. tVo I  
     MaskBits|=CTRLBIT; uS :3Yo  
     break; G'c!82;,?  
    case VK_SHIFT: ]p3hq1u3&  
     MaskBits|=SHIFTBIT; U85t !U  
     break; h>B>t/k?  
    default: //judge the key and send message 2^ 'X  
     break; ;OW`(jC  
   } ?_9cFo59:  
   for(int index=0;index<MAX_KEY;index++) | >xUgpQi  
   { [~$Ji&Dd  
    if(hCallWnd[index]==NULL) >W 2Z]V  
     continue; G hH0-g{-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e* gCc7zz  
    { hg7`jE&2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d!) &@k  
     bProcessed=TRUE; ,sPsL9]$  
    } Zyq h  
   } MtOA A  
  } xM85^B'  
  if(!bProcessed){ k1y&' 3%  
   for(int index=0;index<MAX_KEY;index++){ /$zYSP)YT  
    if(hCallWnd[index]==NULL) b6!?K!imT  
     continue; <Q)6N!Tp^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'qBg^c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4)Y=)#=  
   } L+Q"z*W  
  } Qg  
 } rlu{C4l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); SPA_a\6_  
} xy`aR< L  
]dk44,EL  
BOOL InitHotkey() _[h1SAJ  
{ \2i4]V  
 if(hHook!=NULL){ G`E%uyjG$j  
  nHookCount++; Gad! }dz  
  return TRUE; o?uTL>Zin  
 } "^~f.N  
 else OIB~ W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Nb\4Mv`  
  if(hHook!=NULL) B]]_rl,  
   nHookCount++; '7[{ISBXU  
  return (hHook!=NULL); `9b/Q  
} )ARfI)<1b  
BOOL UnInit() R^P~iAO  
{ sJtz{'  
 if(nHookCount>1){ zllY $V&<!  
  nHookCount--; lwPK^)|}  
  return TRUE; esmQ\QQ^1  
 } yNdtq\h  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -?<wvUbR{  
 if(unhooked==TRUE){ {6'5K U*RH  
  nHookCount=0; N8:?Z#z  
  hHook=NULL; yJ8WYQQMG  
 } '#[U7(lIQ  
 return unhooked; $6atr-Pb  
} u*`acmS>N  
a?E]-Zf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qQ%zSJ?  
{ <||F$t  
 BOOL bAdded=FALSE; \tLJ( <8  
 for(int index=0;index<MAX_KEY;index++){ @5Q}o3.zA-  
  if(hCallWnd[index]==0){ i%>]$*  
   hCallWnd[index]=hWnd; /lDW5;d  
   HotKey[index]=cKey; i>r4Rz!  
   HotKeyMask[index]=cMask; ^sd+s ~ xx  
   bAdded=TRUE; NS6Bi3~  
   KeyCount++; zAt!jP0E  
   break; N!m-gymmF  
  } <=n$oMO  
 } ymXR#E  
 return bAdded; 9I=J#Hi|+  
} >[,Rt"[V  
1 9a"@WB@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ovzIJbf  
{ +pc_KR  
 BOOL bRemoved=FALSE; wA) NB  
 for(int index=0;index<MAX_KEY;index++){ b,/fz6 {N  
  if(hCallWnd[index]==hWnd){  ^"K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g"( vl-Uw  
    hCallWnd[index]=NULL; EnA) Rz  
    HotKey[index]=0; E*>tFw&[  
    HotKeyMask[index]=0; |gx{un`  
    bRemoved=TRUE; "R+ x  
    KeyCount--; A,e/y  
    break; P1 =bbMk  
   } e{U`^ao`F8  
  } 9c8zH{T_{  
 } tc\LK_@$/F  
 return bRemoved; :Y(Yk5  
} M kko1T=6  
Wra*lQb/B  
void VerifyWindow() << LmO-92  
{ $&EZVZ{r  
 for(int i=0;i<MAX_KEY;i++){ Wt()DG|[  
  if(hCallWnd!=NULL){ uCF+Mp  
   if(!IsWindow(hCallWnd)){ 9c9-1iS  
    hCallWnd=NULL; `r'q(M  
    HotKey=0; "v/^nH  
    HotKeyMask=0; HI#}M|4n  
    KeyCount--; ?`AzgM[I  
   } f'\I52;FB  
  } 1%^U=[#2`  
 } KCq qwGM  
} Thn-8DT  
]o$Kh$~5  
BOOL CHookApp::InitInstance() r.xGvo{iY  
{ !sEI|47{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E0\ '  
 hins=AfxGetInstanceHandle(); E,shTh%&~  
 InitHotkey(); 35) ]R`f  
 return CWinApp::InitInstance(); s) u{A  
} iBwl(,)?m2  
dE_BV=H{  
int CHookApp::ExitInstance() Xp1xhb*^  
{ Zg5@l3w  
 VerifyWindow(); M7Cq)cT  
 UnInit(); :35J<oG  
 return CWinApp::ExitInstance(); [esjR`u  
} ETV|;>v  
)K -@{v^|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /XEcA 5C<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) eg~$WB;1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vlw2dY@^  
#if _MSC_VER > 1000 /8q7pwV  
#pragma once |iLeOztuE  
#endif // _MSC_VER > 1000 i cQsA  
lEQ 63)Z  
class CCaptureDlg : public CDialog zu(/ c  
{ 1m|Oi%i4  
 // Construction TmH#  
 public: jMcCu$i7  
  BOOL bTray; f";70}_  
  BOOL bRegistered; ,8;;#XR3  
  BOOL RegisterHotkey(); v[e$RH  
  UCHAR cKey; =y,_FFoS  
  UCHAR cMask; _:+W0YS  
  void DeleteIcon(); D2E~ c? V  
  void AddIcon(); D`3}j  
  UINT nCount; vpv PRwJ  
  void SaveBmp(); aN ). G1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L; Nz\sJ  
  // Dialog Data @za?<G>!'e  
  //{{AFX_DATA(CCaptureDlg) yf*MG&}  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~d/Doi  
  CComboBox m_Key;  v#IW;Rj8  
  BOOL m_bControl; %g5weiFM  
  BOOL m_bAlt; E+dr\Xhv  
  BOOL m_bShift; DvF`KHsy  
  CString m_Path; Z?oFee!4  
  CString m_Number; 4FQU$f  
  //}}AFX_DATA Q5;K m1(  
  // ClassWizard generated virtual function overrides r9%4q4D?>9  
  //{{AFX_VIRTUAL(CCaptureDlg) j1v fp"J1  
 public: _p?lRU8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2fO ~%!.G  
 protected: *1ekw#'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /_xwHiA  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mdypZ1f_  
  //}}AFX_VIRTUAL '-D-H}%;}M  
  // Implementation  X4BDl  
 protected: pJ6bX4QnDX  
  HICON m_hIcon; WU Q2[)<  
  // Generated message map functions kR%CSLOVy  
  //{{AFX_MSG(CCaptureDlg) N12K*P[!  
  virtual BOOL OnInitDialog(); 702&E(rx,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -1Lh="US  
  afx_msg void OnPaint(); )$P!7$C-  
  afx_msg HCURSOR OnQueryDragIcon(); (jPN+yQ  
  virtual void OnCancel(); LZ|G"5X[  
  afx_msg void OnAbout(); H_ .@{8I  
  afx_msg void OnBrowse(); 9:!n'mn  
  afx_msg void OnChange(); (5_l7hWY  
 //}}AFX_MSG uWG'AmK_#E  
 DECLARE_MESSAGE_MAP() l|%7)2TyG)  
}; PD|I3qv~  
#endif rxI?|}4  
x(hUQu 6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Wgq*|teW  
#include "stdafx.h" 1mJBxg}(  
#include "Capture.h" `;(/W h  
#include "CaptureDlg.h" s_.q/D@vu  
#include <windowsx.h> M98dQ%4I  
#pragma comment(lib,"hook.lib") [m|\N  
#ifdef _DEBUG rD%(*|Y"c  
#define new DEBUG_NEW uCNQ.Nbf C  
#undef THIS_FILE !z{bqPlFGG  
static char THIS_FILE[] = __FILE__; *;m5^i<,;S  
#endif xHJ+!   
#define IDM_SHELL WM_USER+1 /6gqpzum4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )KaQ\WJ:   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Zu$f-_"  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /!eC;qp;[  
class CAboutDlg : public CDialog {3$ge  
{ C&NoEtL>s  
 public: 59$mfW o>  
  CAboutDlg(); R{8nR0 0|1  
  // Dialog Data 3`n5[RV  
  //{{AFX_DATA(CAboutDlg) e&8pTD3  
  enum { IDD = IDD_ABOUTBOX }; }Da8S|)H  
  //}}AFX_DATA 9gn_\!Mp  
  // ClassWizard generated virtual function overrides CYEqH2"3  
  //{{AFX_VIRTUAL(CAboutDlg) UQPd@IVu6  
 protected: aP cO9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $$A{|4,aI  
  //}}AFX_VIRTUAL y`mEsj  
  // Implementation *.Y! ZaK  
 protected: |B)e! #  
  //{{AFX_MSG(CAboutDlg) L G,XhN  
  //}}AFX_MSG =Q.2:*d.  
  DECLARE_MESSAGE_MAP() gEO#-tMjOQ  
}; l#~Sh3@L(  
{u9(qd;;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) fF_1ZKx+#!  
{ kkyn>Wxv  
 //{{AFX_DATA_INIT(CAboutDlg) V*5:Vt7N  
 //}}AFX_DATA_INIT .m;1V6  
} WQv~<]1J F  
@-kzSm  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iq5h[  
{ +m:U9K(\h  
 CDialog::DoDataExchange(pDX); nvu|V3B0  
 //{{AFX_DATA_MAP(CAboutDlg) 5EFow-AH  
 //}}AFX_DATA_MAP mmwwz  
} !g=,O6  
F!|Z_6\tv:  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) HpDU:m  
 //{{AFX_MSG_MAP(CAboutDlg) ~b3xn T  
 // No message handlers G/Kz_Y,  
 //}}AFX_MSG_MAP VXn]*Mo  
END_MESSAGE_MAP() MZn7gT0  
?lR)Hi  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +SrE  
: CDialog(CCaptureDlg::IDD, pParent) 1^}() H62}  
{ {KeHqM}e  
 //{{AFX_DATA_INIT(CCaptureDlg) EK@yzJ%  
  m_bControl = FALSE; KP _=#KD  
  m_bAlt = FALSE; H#m)`=nZSZ  
  m_bShift = FALSE; 7Q 0 M3m  
  m_Path = _T("c:\\"); Q7"KgqpQ3  
  m_Number = _T("0 picture captured."); ~bigaY  
  nCount=0; .oaW#f}0P  
  bRegistered=FALSE; miZ{V%  
  bTray=FALSE; p tv  
 //}}AFX_DATA_INIT 6:-qL}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @r+ErFI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P6i4Dr  
} KbMgatI/  
X[j4V<4O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) gBYL.^H^l  
{ V,|l&-  
 CDialog::DoDataExchange(pDX); m ~fqZK  
 //{{AFX_DATA_MAP(CCaptureDlg) y<BiR@%,7  
  DDX_Control(pDX, IDC_KEY, m_Key); A{x &5yX8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ]8+%57:E  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /:ma}qG y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^T(l3r  
  DDX_Text(pDX, IDC_PATH, m_Path); =ub&@~E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); mgG0uV  
 //}}AFX_DATA_MAP =bN[TD  
} zi-zg Lx  
|rW}s+Kcr  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "SLN8x49(  
//{{AFX_MSG_MAP(CCaptureDlg) w]tv<U={  
 ON_WM_SYSCOMMAND() R!*UU'se  
 ON_WM_PAINT() XXuU@G6Z7$  
 ON_WM_QUERYDRAGICON() aNn< NW  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0z#+^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }= s@y"["  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ukS@8/eJ  
//}}AFX_MSG_MAP Bwb3@vNA  
END_MESSAGE_MAP() %L/Wc,My  
ppb]RN|)  
BOOL CCaptureDlg::OnInitDialog() wA.YEI|CSj  
{ 4)JrOe&k  
 CDialog::OnInitDialog(); *N\U{)b\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zclt2?  
 ASSERT(IDM_ABOUTBOX < 0xF000); jGR_EE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); wXuHD<<  
 if (pSysMenu != NULL) (W=z0Lqu  
 { OjJlGElw  
  CString strAboutMenu; (mt,:hX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [g=yuVXNZZ  
  if (!strAboutMenu.IsEmpty()) }4cLU.L8O  
  { U g]6i+rp  
   pSysMenu->AppendMenu(MF_SEPARATOR); J:#B,2F+^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); oF]0o`U&a  
  } E`LML?   
 } Fd5{pM3  
 SetIcon(m_hIcon, TRUE); // Set big icon vq(@B  
 SetIcon(m_hIcon, FALSE); // Set small icon "4`h -Y  
 m_Key.SetCurSel(0); c#u-E6  
 RegisterHotkey(); %pL ,A5M  
 CMenu* pMenu=GetSystemMenu(FALSE); KSh<_`j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3z\:{yl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,_u8y&<|I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ThJLaNS  
 return TRUE; // return TRUE unless you set the focus to a control 4xtbP\=   
} }k\a~<'X  
U>:CX XHRt  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `U2Z(9le  
{ #jA|04w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |5e/.T$  
 { -$dnUXFsj[  
  CAboutDlg dlgAbout; RBt"7'  
  dlgAbout.DoModal(); `+1*)bYxU  
 } S@N&W&W#~  
 else 3|9) A+,#  
 { =;dupz\7  
  CDialog::OnSysCommand(nID, lParam); {s=QwZdR  
 } aina6@S  
} &IXr*I  
sKn>K/4JZ  
void CCaptureDlg::OnPaint() JY9Hqf  
{ e#FaK^V  
 if (IsIconic()) sw{EV0&>m  
 { `5[VO  
  CPaintDC dc(this); // device context for painting ^L]+e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2NIK0%6  
  // Center icon in client rectangle ;oob TW{  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9zi/z_G  
  int cyIcon = GetSystemMetrics(SM_CYICON); <MT_zET  
  CRect rect; ~u,g5  
  GetClientRect(&rect); i1FFf[[L  
  int x = (rect.Width() - cxIcon + 1) / 2; |= N8X  
  int y = (rect.Height() - cyIcon + 1) / 2; s67$tlV  
  // Draw the icon 0/{-X[z  
  dc.DrawIcon(x, y, m_hIcon); aJI>qk h?]  
 } Yfxc$ub  
 else Mgcq'{[~Y=  
 { *=@Z\]"?  
  CDialog::OnPaint(); ;&Eu< %y  
 } |=jgrm1yj  
} p_B,7@Jl  
<| Xf4.  
HCURSOR CCaptureDlg::OnQueryDragIcon() $'?CY)h{  
{ jpm}EOq<%  
 return (HCURSOR) m_hIcon; VaVKWJg$  
} L!mQP  
akJ{-   
void CCaptureDlg::OnCancel() mQ VduG  
{ 1m}'Y@I  
 if(bTray) F4kU) i  
  DeleteIcon(); &rcr])jg[  
  CDialog::OnCancel(); W 86S)+h  
} 'qQ DM_+  
!Aunwq^  
void CCaptureDlg::OnAbout() }-: d*YtK  
{ \m5:~,p=  
 CAboutDlg dlg; MT%ky  
 dlg.DoModal(); MSRIG-  
} 5A~w_p*}  
3w!oJB  
void CCaptureDlg::OnBrowse() wpx,~`&  
{ )z7. S"U  
 CString str; hl6al:Y  
 BROWSEINFO bi; I?bL4u$\  
 char name[MAX_PATH]; %b@>riR(y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); LO# {   
 bi.hwndOwner=GetSafeHwnd(); -aKk#fd  
 bi.pszDisplayName=name; mUcHsCszH  
 bi.lpszTitle="Select folder"; L?Wl#wP\;*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -s:JD J*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); sDJ5'ul  
 if(idl==NULL) Br \/7F  
  return; V&h ,v%$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eA{,=, v)  
 str.ReleaseBuffer(); t m5>J)C  
 m_Path=str; &/=xtO/Z{  
 if(str.GetAt(str.GetLength()-1)!='\\') zx#d _SVi  
  m_Path+="\\"; <XCH{Te1  
 UpdateData(FALSE); 47$JN}qI0  
} >s[}f6*2@  
c{||l+B  
void CCaptureDlg::SaveBmp() mc!3FJ  
{ bTHJbpt*-  
 CDC dc; GN=F-*2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~;bwfp_  
 CBitmap bm; w<\N-J|m  
 int Width=GetSystemMetrics(SM_CXSCREEN); dn%/SJC  
 int Height=GetSystemMetrics(SM_CYSCREEN); #?}Y~Oe  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y$oBsg\v  
 CDC tdc; G!0|ocE}  
 tdc.CreateCompatibleDC(&dc); O}#*U+j  
 CBitmap*pOld=tdc.SelectObject(&bm); M 80Us.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); iDHmS6_c  
 tdc.SelectObject(pOld); r)U9u 0  
 BITMAP btm; pxDZ}4mOh  
 bm.GetBitmap(&btm); &(Xp_3PO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \Cx3^ i X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ->8n.!F}  
 BITMAPINFOHEADER bih; nqiy)ZN#R  
 bih.biBitCount=btm.bmBitsPixel; Y*w< ~m  
 bih.biClrImportant=0; -pg7>vOq  
 bih.biClrUsed=0; P 3lN ns3  
 bih.biCompression=0; tC|5;'m.2  
 bih.biHeight=btm.bmHeight; Fo~C,@/Qt  
 bih.biPlanes=1; 2<u vz<B  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z(xn-  
 bih.biSizeImage=size; V :d/;~  
 bih.biWidth=btm.bmWidth; hDmVv;M:  
 bih.biXPelsPerMeter=0; ='soSnT  
 bih.biYPelsPerMeter=0; YdC:P# Nf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J0o U5d=3  
 static int filecount=0; _ogT(uYyr  
 CString name; 60X B  
 name.Format("pict%04d.bmp",filecount++); ;&JMBn]J  
 name=m_Path+name; J8/>b{Y  
 BITMAPFILEHEADER bfh; H(?z?2b p  
 bfh.bfReserved1=bfh.bfReserved2=0; u@==Ut  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !aLByMA  
 bfh.bfSize=54+size; \ZCc~muR  
 bfh.bfOffBits=54; )o9CFhFB  
 CFile bf; /SN.M6~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^z0[{1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [gQ~B1O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xvpS%MS  
  bf.WriteHuge(lpData,size); G V0q?  
  bf.Close(); &w/aQs~  
  nCount++; U$0#j  
 } __3Cjo^6&  
 GlobalFreePtr(lpData); @["Vzg!I6"  
 if(nCount==1) y}#bCRy~.A  
  m_Number.Format("%d picture captured.",nCount); $Fd9iJ!k  
 else H Qf[T@  
  m_Number.Format("%d pictures captured.",nCount);  kQX,MP(  
  UpdateData(FALSE); G=~T)e  
} U%w-/!p  
wond>m 3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ce+\D'q[  
{ iW)FjDTP  
 if(pMsg -> message == WM_KEYDOWN) vcV=9q8P1  
 { Mc76)  
  if(pMsg -> wParam == VK_ESCAPE) @iWIgL  
   return TRUE; &Hh%pY"  
  if(pMsg -> wParam == VK_RETURN) (`>4~?|+T  
   return TRUE; +=O8t0y n  
 } rl4daV&,U  
 return CDialog::PreTranslateMessage(pMsg); kw=+"U   
} A:NsDEt  
7cvbYP\<lv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sVh!5fby&  
{ `$MO.K{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m0=CD  
  SaveBmp(); n:k~\-&WJ  
  return FALSE; [!bTko>rSB  
} <niHJ*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ '%K,A-7W  
 CMenu pop; L & PhABZ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LuQ=i`eXx  
 CMenu*pMenu=pop.GetSubMenu(0); /!7m@P|&D  
 pMenu->SetDefaultItem(ID_EXITICON); B;7L:  
 CPoint pt; #C !8a  
 GetCursorPos(&pt); #kma)_X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); m"+9[d_u  
 if(id==ID_EXITICON) xx9qi^  
  DeleteIcon(); tLV9b %i(  
 else if(id==ID_EXIT) yt_?4Hc"  
  OnCancel(); ^dqyX(  
 return FALSE; p|AIz3  
} S' TF7u  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A "S})  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7CwG(c/5  
 AddIcon(); M[TgNWl/[  
 return res; ;Iv)J|*  
} 7i 6-Hq  
UyK|KL  
void CCaptureDlg::AddIcon() JrCm >0g  
{ Fz>J7(Y.j  
 NOTIFYICONDATA data; dc%+f  
 data.cbSize=sizeof(NOTIFYICONDATA); Is?0q@  
 CString tip; 6ng . =  
 tip.LoadString(IDS_ICONTIP); qIO)Z   
 data.hIcon=GetIcon(0); DSET!F;PG  
 data.hWnd=GetSafeHwnd(); Kw-E%7gh4c  
 strcpy(data.szTip,tip); ^5"s3Qn  
 data.uCallbackMessage=IDM_SHELL; W@pVP4F0xM  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2/>AmVM  
 data.uID=98; VN`2bp>5I  
 Shell_NotifyIcon(NIM_ADD,&data); SjG=H%  
 ShowWindow(SW_HIDE); {\lu; b!  
 bTray=TRUE; O`|'2x{[O  
} ]S%qfna e1  
F=d#$-yg  
void CCaptureDlg::DeleteIcon() ds7I .Q'  
{ 2ht<"  
 NOTIFYICONDATA data; dwJ'hg  
 data.cbSize=sizeof(NOTIFYICONDATA); MdEZ839J  
 data.hWnd=GetSafeHwnd(); X g.\B1d  
 data.uID=98; r7w&p.?  
 Shell_NotifyIcon(NIM_DELETE,&data); G9}[g)R*  
 ShowWindow(SW_SHOW); /r}t  
 SetForegroundWindow(); E!3W_:Bs  
 ShowWindow(SW_SHOWNORMAL); - n11L  
 bTray=FALSE; n%Nf\z  
} ]km8M^P  
(x?A#o>%  
void CCaptureDlg::OnChange() \JN<"/  
{ ,bJZs-P0  
 RegisterHotkey(); e&]XiV'  
} nm\n\j~  
xNq&_oY7  
BOOL CCaptureDlg::RegisterHotkey() F/@#yQv?  
{ N:gS]OI*  
 UpdateData(); JUwP<C[  
 UCHAR mask=0; WWq)Cw R  
 UCHAR key=0; 0W]Wu[k  
 if(m_bControl) d [K56wbpx  
  mask|=4; 9[$g;}w  
 if(m_bAlt) Kw925@W  
  mask|=2; f9OVylm  
 if(m_bShift) VbA#D4;  
  mask|=1; 9{ciD "!&V  
  key=Key_Table[m_Key.GetCurSel()]; (AR-8  
 if(bRegistered){ f N t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Zf(ucAhL  
  bRegistered=FALSE; 8]2S'm xE  
 } #M{}Grg  
 cMask=mask; 4S03W  
 cKey=key; 1N:eM/a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); d![EnkyL;  
 return bRegistered; @@!t$dD  
} 7jEAhi!Cq(  
Z@~8iAgE  
  四、小结 W&Fa8  
<8j n_6  
  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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