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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: b.QpHrnhtK  
  Z[Wlyb0  
  一、实现方法 :~yzDk\I"-  
CE)*qFs  
  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: :`D'jF^S  
L >SZgmV+  
#pragma data_seg("shareddata") 5v"Y\k+1  
HHOOK hHook =NULL; //钩子句柄 _-n Y2)  
UINT nHookCount =0; //挂接的程序数目 x_yF|]aI!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A:/}`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hQXxG/yFm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P3G:th@j=  
static int KeyCount =0; aSUsyOe  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +9RJ%i&Ec  
#pragma data_seg() =M/qV  
+Y7Pg'35  
  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。 M~-h-tG  
V|TA:&:7  
  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:  L#n}e7Y9  
H ZPcd_(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L^lS^P  
cKey,UCHAR cMask) GE@uO J6H  
{ im=5{PbJ^  
 BOOL bAdded=FALSE; /mc*Hc 8R8  
 for(int index=0;index<MAX_KEY;index++){ @8|Gh]\P  
  if(hCallWnd[index]==0){ D-6  
   hCallWnd[index]=hWnd; I-,>DLG  
   HotKey[index]=cKey; pDGT@qJ  
   HotKeyMask[index]=cMask; Rfht\{N 7  
   bAdded=TRUE; =nzFd-P  
   KeyCount++; %*6RzJO6  
   break; V"O 9n[|  
  } H.:9:I[n  
 } HL@TcfOe~  
 return bAdded; ~x'zX-@rC  
} VUp. j  
//删除热键 +$PFHXB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wS V@=)H\:  
{ q-YL]PgV  
 BOOL bRemoved=FALSE; x@Y|v@}BE  
 for(int index=0;index<MAX_KEY;index++){ Lx%:t YZ  
  if(hCallWnd[index]==hWnd){ HcA[QBh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #pX8{Tf[  
    hCallWnd[index]=NULL; v;Es^ YI  
    HotKey[index]=0; pajy#0 U  
    HotKeyMask[index]=0; G.Tpl-m  
    bRemoved=TRUE; !3h{lE B  
    KeyCount--; #7o0dE;Kg9  
    break; *<r%aeG$em  
   } |CwG3&8  
  } YZ< NP  
 } 7aQ n;  
 return bRemoved; 6GzzG P^  
} :9`qogF>  
4`s)ue  
Ir/:d]N*  
  DLL中的钩子函数如下: PK+ x6]x  
&U&Zo@ot"x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uN9e:;  
{ ailG./I+  
 BOOL bProcessed=FALSE; KSc~GP _  
 if(HC_ACTION==nCode) =5ug\S  
 { @ u+|=x];  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8b7;\C~$p  
   switch(wParam) )!eEO [\d  
   {  VD/&%O8n  
    case VK_MENU: 9<l-NU9 _  
     MaskBits&=~ALTBIT; 088C|  
     break; ^>^ \CP]  
    case VK_CONTROL: NI8~QeGah  
     MaskBits&=~CTRLBIT;  i S  
     break; Ihg~Q4t  
    case VK_SHIFT: ra]:$XJ5=a  
     MaskBits&=~SHIFTBIT; %K?iNe  
     break; q!&B6]  
    default: //judge the key and send message t!{x<9  
     break; l<xFnj  
   } +*C^:^jA  
   for(int index=0;index<MAX_KEY;index++){ #/ +I*B*y  
    if(hCallWnd[index]==NULL) "y$ qrN-  
     continue; zmb@*/fK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p![&8i@ym  
    { J)*8|E9P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s`c?:  
     bProcessed=TRUE; j=W@P-  
    } Vv7PCaq  
   } Xhse~=qA  
  } P>wZ~Hjk  
  else if((lParam&0xc000ffff)==1){ //有键按下 ({e7U17[#  
   switch(wParam)  2:'lZQ  
   { (@q3^)I4  
    case VK_MENU: )[jy[[K(  
     MaskBits|=ALTBIT; g/#~N~&  
     break; +9zA^0   
    case VK_CONTROL: ~KRnr0  
     MaskBits|=CTRLBIT; ~C| ,b"  
     break; E0YU[([G  
    case VK_SHIFT: )b92yP{  
     MaskBits|=SHIFTBIT; *S4aF*Qk  
     break; gI{ =0  
    default: //judge the key and send message <HF-2?`  
     break; bMmra.x4L  
   } 9|=nV|R'6  
   for(int index=0;index<MAX_KEY;index++){ B\[-fq  
    if(hCallWnd[index]==NULL) 3gc"_C\$  
     continue; %ek"!A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :B.G)M\  
    { v9rVpYc"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q#pnj thM  
     bProcessed=TRUE; h<% U["   
    } dIJGB==  
   } Gw{+xz KJ  
  } 7`fY*O6   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Dtt-|_EMS  
   for(int index=0;index<MAX_KEY;index++){ X *O9JGh  
    if(hCallWnd[index]==NULL) zMGzReJ  
     continue; >vVw!.fJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -:S IS`0s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nU17L6'$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 PN &|8_  
   } WNF9#oN|oT  
  } $XGtS$  
 } iBoEZEHjw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <hv7s,i  
} <*Ub2B[m  
Dm%%e o  
  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.:r;%a  
2-mQt_ i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sPCMckt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VR4%v9[1  
a$m_D!b~_  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 8lwM{?k$  
FT.@1/)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Pp*}R2  
{ Tpzw=bC^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3cC }'j  
 { 1[DS'S  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0S.?E.-&0  
  SaveBmp(); zfjw;sUX  
  return FALSE; ?"j@;/=  
 } >a=d;  
 …… //其它处理及默认处理 >^3zU   
} C[YnrI!  
+'XhC#:  
T//S,   
  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。 Df@/cT  
e{C6by"j{S  
  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。 F=}Z51|:~  
^>m^\MuZ  
  二、编程步骤 V;93).-$  
r )b<{u=]  
  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"; {?i)K X^  
D{C:d\ e)$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; C).2gQ G  
ce'TYkPM  
  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; 0JXqhc9'  
lIh[|]  
  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; ]y LhJ_^  
" H1:0p  
  5、 添加代码,编译运行程序。 W-D[z#)/Y  
QlD6i-a  
三、程序代码 ~lw<799F6  
ow.j+ <M  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL oT3Y!Y3=<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8i: [:Z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 16$y`~c-z  
#if _MSC_VER > 1000 @\}YAa>>"I  
#pragma once @ Nb%L&=P8  
#endif // _MSC_VER > 1000 X/+OF'po  
#ifndef __AFXWIN_H__ 0{R/<N  
#error include 'stdafx.h' before including this file for PCH %MJ;Q?KB  
#endif 8#59iQl  
#include "resource.h" // main symbols d+}kg  
class CHookApp : public CWinApp Y {c5  
{ <xn;bp[  
 public: &1GUi{I  
  CHookApp(); |(ocDmd  
  // Overrides p4> ,Fwy2  
  // ClassWizard generated virtual function overrides Qb`C)Nh:  
  //{{AFX_VIRTUAL(CHookApp) %S#WPD'Y  
 public: Hr }k5'  
  virtual BOOL InitInstance(); (~()RkT  
  virtual int ExitInstance(); Vk7=7%xW  
  //}}AFX_VIRTUAL m mw-a0  
  //{{AFX_MSG(CHookApp) .wc = ]  
  // NOTE - the ClassWizard will add and remove member functions here. Q6^x8  
  // DO NOT EDIT what you see in these blocks of generated code ! 6fwY$K\X  
  //}}AFX_MSG >n!ni(  
  DECLARE_MESSAGE_MAP() ~HDdO3  
};  r(`nt-o@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7& 6Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _/ Os^>R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %EI<@Ps8c  
BOOL InitHotkey(); DU{bonR`  
BOOL UnInit(); j>'B [  
#endif Z nXejpj)D  
8#f$rs(}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ax@H"d&  
#include "stdafx.h" 7co`Zw4}g  
#include "hook.h" nb+m.X  
#include <windowsx.h> <k]qH-v4  
#ifdef _DEBUG 8(xw?|D7  
#define new DEBUG_NEW J70D+  
#undef THIS_FILE >o[|"oLO  
static char THIS_FILE[] = __FILE__; (wA?;]q(  
#endif U:lv^ QPG  
#define MAX_KEY 100 }*kJ-q&0  
#define CTRLBIT 0x04 _V@P-Ye  
#define ALTBIT 0x02 #WufZ18#  
#define SHIFTBIT 0x01 qY(:8yC36  
#pragma data_seg("shareddata") T9)wj][ .  
HHOOK hHook =NULL; X\sm[_I  
UINT nHookCount =0; V(mn yI  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qm(1:iK,0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1^{`lK~2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ._<ii2K'  
static int KeyCount =0; km\%BD~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift nNn56&N]  
#pragma data_seg() G6O/(8  
HINSTANCE hins; PZM42"[&  
void VerifyWindow(); MF.[8Zb  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ixw(c&gL  
//{{AFX_MSG_MAP(CHookApp) % vS8?nG  
// NOTE - the ClassWizard will add and remove mapping macros here. .JAcPyK^  
// DO NOT EDIT what you see in these blocks of generated code! F2>%KuM  
//}}AFX_MSG_MAP d6.}.*7Whc  
END_MESSAGE_MAP() ?R6`qe_F  
0BTLcEqgZ  
CHookApp::CHookApp() ,Y!zORv<7  
{ @ajM^L!O  
 // TODO: add construction code here, OE"<!oIs  
 // Place all significant initialization in InitInstance ((MLM3zJ  
} PXEKV0y  
xncwYOz  
CHookApp theApp; ybvI?#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B\_[R'Pf&  
{ FH\CK  
 BOOL bProcessed=FALSE; OFy,B-`A{  
 if(HC_ACTION==nCode) Rd! 2\|  
 { b5 Q NEi  
  if((lParam&0xc0000000)==0xc0000000){// Key up Tsz NlRxc  
   switch(wParam) jA`a/v Wu  
   { W_<4WG  
    case VK_MENU: iBvOJs  
     MaskBits&=~ALTBIT; ty- r&  
     break; y/R+$h(%  
    case VK_CONTROL: j Z'&0x"U  
     MaskBits&=~CTRLBIT; - L~Uu^o  
     break; 0HbJKix!  
    case VK_SHIFT: <abKiXA"  
     MaskBits&=~SHIFTBIT; -p8e  
     break; ~A >o O-0K  
    default: //judge the key and send message )H+kB<n  
     break; PDC]wZd/  
   } -g~~]K%  
   for(int index=0;index<MAX_KEY;index++){ %f!iHo+Z  
    if(hCallWnd[index]==NULL) K`4GU[ul  
     continue; /`+7_=-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~:2K#q5C  
    { #nEL~&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \A(5;ZnuD  
     bProcessed=TRUE; 3k{ @.V ?]  
    }  _^T}_  
   } yGEb7I$h  
  } v2J0u:#,  
  else if((lParam&0xc000ffff)==1){ //Key down Q!$IQJ]|Y  
   switch(wParam) ;[Tyt[  
   { \ X$)vK  
    case VK_MENU: -P#nT 2  
     MaskBits|=ALTBIT; j>!sN`dBj  
     break; Kbas-</Si  
    case VK_CONTROL: v~5<:0dL  
     MaskBits|=CTRLBIT; `P.CNYR<J  
     break; K^H>~`C=  
    case VK_SHIFT: Z[} $n-V  
     MaskBits|=SHIFTBIT; oVkr3K Z  
     break; p>p'.#M  
    default: //judge the key and send message 4VFc|g  
     break; OCW+?B;  
   } Qp!J:YV  
   for(int index=0;index<MAX_KEY;index++) SDc" 4g`  
   { &=zU611,  
    if(hCallWnd[index]==NULL) t!jwY/T  
     continue; V2<i/6~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >&hX&,hG  
    { 0<&M?^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w3bIb$12  
     bProcessed=TRUE; u^=@DO'  
    } YMu)  
   } a8JN19}D  
  } },PBqWe  
  if(!bProcessed){ UC|JAZL  
   for(int index=0;index<MAX_KEY;index++){ fn1pa@P  
    if(hCallWnd[index]==NULL) G (\Ckf:  
     continue; RgGA$HN/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) g1qi\axm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8]C1K Zs  
   } `Bu9Nq  
  } D5` (}  
 } b1=pO]3u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p7UTqKi  
} @L;C_GEa  
k7Oy5$##  
BOOL InitHotkey() J px'W  
{ e?<D F.Md+  
 if(hHook!=NULL){ B] i:)   
  nHookCount++; 4$Pr|gx  
  return TRUE; #!d]PH746  
 } b-nYxd  
 else (C\r&N  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ifrq  
  if(hHook!=NULL)  !!+Da>  
   nHookCount++; )ddsyFGW  
  return (hHook!=NULL); P6we(I`"2  
} xid:"y=_&  
BOOL UnInit() \7 Mq $d  
{ ~:Ixmqi}R  
 if(nHookCount>1){ o)!m$Q~v  
  nHookCount--; #=x+ [d+  
  return TRUE; oD,C<[(p  
 }  UTX](:TC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); iGa}3pF  
 if(unhooked==TRUE){ s3< F  
  nHookCount=0; .. UoyBV  
  hHook=NULL; M=+M8M`Iy  
 } 7j T}{ x  
 return unhooked; hVZo"XUb  
} JUU&Z[6J  
ohplj`X[21  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z8tl0gd%D  
{ 7TdQRB  
 BOOL bAdded=FALSE; 0||F`24  
 for(int index=0;index<MAX_KEY;index++){ Ilef+V^qr  
  if(hCallWnd[index]==0){ p`p?li  
   hCallWnd[index]=hWnd; k<O y%+C  
   HotKey[index]=cKey; %M6 c0d[9-  
   HotKeyMask[index]=cMask; C8MWIX}  
   bAdded=TRUE; jGiw96,Y  
   KeyCount++; 4:`[qE3  
   break; ?cxr%`E  
  } 7@~QkTH~y  
 } Y^3)!>  
 return bAdded; $_bZA;EMQ  
} I-{^[pp  
%^!aB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H;wR  
{ os_WYQ4>j  
 BOOL bRemoved=FALSE; +"Ub/[J{G1  
 for(int index=0;index<MAX_KEY;index++){ +!xu{2!  
  if(hCallWnd[index]==hWnd){ {? 2;0}3?;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d<v~=  
    hCallWnd[index]=NULL; sMX$Q45e  
    HotKey[index]=0; en%B>]QI  
    HotKeyMask[index]=0; J7m`]!*t  
    bRemoved=TRUE; q_pmwJ:UL  
    KeyCount--; 0Jg+sUs{  
    break; SS0_P jKz  
   } U/5$%0)  
  } idz9YpW  
 } QQq/5r4O`q  
 return bRemoved; .5z&CJDiIi  
} 7vq DZg  
Dt|fDw$]D  
void VerifyWindow() 19&)Yd1  
{ %yKKUZ~  
 for(int i=0;i<MAX_KEY;i++){ vG3M5G  
  if(hCallWnd!=NULL){ ki4Xp'IK  
   if(!IsWindow(hCallWnd)){ uAT/6@  
    hCallWnd=NULL; `x*/UCy\  
    HotKey=0; KcnjF^k  
    HotKeyMask=0; 94YA2_f;  
    KeyCount--; o"4E+1qwM  
   } L}b'+Wi@  
  } b?>VPuyBb  
 } )r pD2H  
} {s9<ej~<R  
I3An57YV].  
BOOL CHookApp::InitInstance() M#T#:wf~  
{ qzHU)Ns(_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FSe5k5  
 hins=AfxGetInstanceHandle(); L,W:,i/C  
 InitHotkey(); lfRH`u  
 return CWinApp::InitInstance(); gtMw3D`FL  
} Fq4lXlSB  
K?JV]^  
int CHookApp::ExitInstance() +9jivOmK  
{ @Rf^P(  
 VerifyWindow(); tbS#^Y  
 UnInit(); nAvs~J  
 return CWinApp::ExitInstance(); "G@E6{/  
} B/rzh? b  
N:7.:Yw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }Wqtip:L  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n@_)fFD%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ IOS^|2:,  
#if _MSC_VER > 1000 _C5nApb  
#pragma once e]Puv)S>{8  
#endif // _MSC_VER > 1000 x?gQ\ 0S<  
m'c#uU  
class CCaptureDlg : public CDialog r\B"?oqC  
{ .}`V I`z*  
 // Construction h*l cEzG?A  
 public: VH[l\I(h  
  BOOL bTray; ys/vI/e\  
  BOOL bRegistered; C,(j$Id  
  BOOL RegisterHotkey(); 2zM-Ob<U`  
  UCHAR cKey; i!tc  
  UCHAR cMask; y{?Kao7Ij  
  void DeleteIcon(); N?zV*ngBS  
  void AddIcon(); _=6vW^ s  
  UINT nCount; kM,@[V  
  void SaveBmp(); lqauk)(A0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -&$%|cyThQ  
  // Dialog Data d0Tg qO{  
  //{{AFX_DATA(CCaptureDlg) k 5t{  
  enum { IDD = IDD_CAPTURE_DIALOG }; u!M& ;QL  
  CComboBox m_Key; 2nJYS2mT7  
  BOOL m_bControl; G$|G w  
  BOOL m_bAlt; v,8Si'"i+  
  BOOL m_bShift; 5R)[Ou.  
  CString m_Path; {rz>^  
  CString m_Number; $G)&J2zL  
  //}}AFX_DATA s* @QT8%  
  // ClassWizard generated virtual function overrides t&3 8@p  
  //{{AFX_VIRTUAL(CCaptureDlg) _@7(g(pY 3  
 public: $f9 ,##/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Cy]"  
 protected: 3Nc'3NPQ'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5VuC U  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p1C_`f N,  
  //}}AFX_VIRTUAL :J<Owh@  
  // Implementation ixg\[5.Q+  
 protected: av"Dljc  
  HICON m_hIcon; w' .'Yu6  
  // Generated message map functions ShsJ_/C2  
  //{{AFX_MSG(CCaptureDlg) .vN)A *  
  virtual BOOL OnInitDialog(); !'+\]eA  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X #&(~1O  
  afx_msg void OnPaint(); p!C_:Z5i  
  afx_msg HCURSOR OnQueryDragIcon(); suzFcLxo  
  virtual void OnCancel(); ',:3>{9  
  afx_msg void OnAbout(); 5aa}FdUq  
  afx_msg void OnBrowse(); hkkF1 h  
  afx_msg void OnChange(); X >3iYDe  
 //}}AFX_MSG | pF5`dX  
 DECLARE_MESSAGE_MAP() !Jk(&.  
}; /j`i/Ha1  
#endif E {I)LdAqK  
7YoofI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F">Nrj-bs  
#include "stdafx.h" _3s~!2  
#include "Capture.h" -bv>iIC  
#include "CaptureDlg.h" (N)r#"F V  
#include <windowsx.h> xhw8#  
#pragma comment(lib,"hook.lib") BERn _5gb  
#ifdef _DEBUG 0f_66`  
#define new DEBUG_NEW 6 Xzk;p  
#undef THIS_FILE  JsZAP  
static char THIS_FILE[] = __FILE__; em f0sL  
#endif  EGp~Vo-  
#define IDM_SHELL WM_USER+1 ho?|j"/7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Oex{:dO "F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sURUQ  H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ykErt%k<n  
class CAboutDlg : public CDialog "`gfy  
{ ,-w-su=J_  
 public: :DS2zA  
  CAboutDlg(); *+_fP|cv  
  // Dialog Data MAm1w'ol"  
  //{{AFX_DATA(CAboutDlg) fvAh?<Ul  
  enum { IDD = IDD_ABOUTBOX }; 4d{"S02h  
  //}}AFX_DATA , mAB)at  
  // ClassWizard generated virtual function overrides {hW +^  
  //{{AFX_VIRTUAL(CAboutDlg) =:t@;y  
 protected: @m !9"QhC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @lb=-oR!~  
  //}}AFX_VIRTUAL [ZL r:2+z  
  // Implementation M"$jpBN*  
 protected: ,kGw;8X  
  //{{AFX_MSG(CAboutDlg) (%ri#r  
  //}}AFX_MSG Pj1K  
  DECLARE_MESSAGE_MAP() lOowMlf@2  
}; 7?n* t  
.N-'; %8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mVc'%cPaw  
{ `Yo -5h  
 //{{AFX_DATA_INIT(CAboutDlg) tk3<sr"IQ  
 //}}AFX_DATA_INIT [0**&.obz  
} q/d5P  
d[P>jl%7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VOowA^  
{ cpr{b8Xb8&  
 CDialog::DoDataExchange(pDX); q N[\J7Pz9  
 //{{AFX_DATA_MAP(CAboutDlg) u~naVX\3b  
 //}}AFX_DATA_MAP 8JjU 9#  
} ei|*s+OZu  
1drqWI~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z;"4$@|qE  
 //{{AFX_MSG_MAP(CAboutDlg) Xn ZX *Y]"  
 // No message handlers &}L36|A:  
 //}}AFX_MSG_MAP  }]n>A  
END_MESSAGE_MAP() rlUdAa3  
BRSgB-Rr7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (to/9OrG  
: CDialog(CCaptureDlg::IDD, pParent) Yt O@n@1  
{ VFO&)E/-  
 //{{AFX_DATA_INIT(CCaptureDlg) >zfZw"mEP  
  m_bControl = FALSE; >2/wzsW  
  m_bAlt = FALSE; I 1VEm?CQ  
  m_bShift = FALSE; %x'bo>h@  
  m_Path = _T("c:\\"); Ls$g-k%c@Q  
  m_Number = _T("0 picture captured."); #0YzPMV  
  nCount=0; 0]2B-o"kI  
  bRegistered=FALSE; M|Lw`?T  
  bTray=FALSE; p.TiTFu/  
 //}}AFX_DATA_INIT #BT6bH08X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iEJQ#5))0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); tmY-m,U  
} wE8a4.  
nX.sh  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W:+2We@  
{ ;SlS!6.W-  
 CDialog::DoDataExchange(pDX); 13>3R+o  
 //{{AFX_DATA_MAP(CCaptureDlg) ^b|Nw:  
  DDX_Control(pDX, IDC_KEY, m_Key); :zn ?<(sQ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ad3z]dUZ9  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .^N#|hp^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); G(|(y=ck  
  DDX_Text(pDX, IDC_PATH, m_Path); yK>0[6l  
  DDX_Text(pDX, IDC_NUMBER, m_Number); eM1;Nl  
 //}}AFX_DATA_MAP hO<w]jV,  
} _G}CD|Kx  
He71h(BHm  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Er)_[^) HG  
//{{AFX_MSG_MAP(CCaptureDlg) m^oi4mV  
 ON_WM_SYSCOMMAND() X?}GPA4 W  
 ON_WM_PAINT() 7p>-oR"  
 ON_WM_QUERYDRAGICON() sh)) [V"8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) XpAq=p0;  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L ugk`NUvF  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C+#;L+$Gi  
//}}AFX_MSG_MAP a a Y Q<  
END_MESSAGE_MAP() 7^t(RNq  
'*LN)E> d  
BOOL CCaptureDlg::OnInitDialog() w<F;&' ;@h  
{ @tv];t  
 CDialog::OnInitDialog(); 18w^7!F?~u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <1 1Tqb  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5t5S{aCDr  
 CMenu* pSysMenu = GetSystemMenu(FALSE); feq6!k7  
 if (pSysMenu != NULL) 3_eml\CY  
 { 8$jT#\_  
  CString strAboutMenu; a^}P_hg}-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &F*QYz[  
  if (!strAboutMenu.IsEmpty()) Nj@?}`C 4  
  { t>h i$NX{p  
   pSysMenu->AppendMenu(MF_SEPARATOR); DEwtP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UG?C=Tf  
  } G$kwc F'C  
 } gjN!_^ _  
 SetIcon(m_hIcon, TRUE); // Set big icon kcz#8K]~  
 SetIcon(m_hIcon, FALSE); // Set small icon 5iI3u 7Mn1  
 m_Key.SetCurSel(0); |KrG3-i3X  
 RegisterHotkey(); ONe!'a0  
 CMenu* pMenu=GetSystemMenu(FALSE); 6r-n6#=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wrb& ta  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Dx# @D#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .fh?=B[o#  
 return TRUE; // return TRUE unless you set the focus to a control 2:5gMt  
} JO^ [@  
 T[[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6p6Tse]  
{ |tJ%:`DGw  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FR6I+@ oX~  
 { ~$ qJw?r  
  CAboutDlg dlgAbout; DUliU8B}\  
  dlgAbout.DoModal(); dUtIAh-j  
 } +2fJ  
 else P$ dgO  
 { #bZ=R  
  CDialog::OnSysCommand(nID, lParam); H!>oLui  
 } {2clOUi  
} :E&T}RN  
Nu2]~W&  
void CCaptureDlg::OnPaint() Aag)c~D  
{ iE gM ~  
 if (IsIconic()) sCCr%r]zL  
 { n_&)VF#n(  
  CPaintDC dc(this); // device context for painting 2CgIY89O  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 0t[mhmSU,  
  // Center icon in client rectangle vMdhNOU  
  int cxIcon = GetSystemMetrics(SM_CXICON); xA'#JN<*  
  int cyIcon = GetSystemMetrics(SM_CYICON); (Dh;=xG  
  CRect rect; {ro!OuA  
  GetClientRect(&rect); O8N0]Mz  
  int x = (rect.Width() - cxIcon + 1) / 2; PZg]zz=V4  
  int y = (rect.Height() - cyIcon + 1) / 2; -&D6w9w  
  // Draw the icon s i.a]k/f  
  dc.DrawIcon(x, y, m_hIcon); =LY^3TlDj  
 } Afhx`J1KO  
 else !3 Z|!JY  
 { H1qw1[%0y  
  CDialog::OnPaint(); 2pNJWYW"  
 } &Wz:-G7<n  
} 9l_?n@   
NWwtq&pz2  
HCURSOR CCaptureDlg::OnQueryDragIcon() '"\Mjz)/  
{ (IHBib "  
 return (HCURSOR) m_hIcon; Q R$sIu@%  
} x2c*k$<p  
pz}hh^]t  
void CCaptureDlg::OnCancel() 9QZwUQ  
{ (Ha}xwA~(  
 if(bTray) WzbN=& C]h  
  DeleteIcon(); 5nqdY*  
  CDialog::OnCancel(); uOqDJM'RM  
} H>X1(sh#}  
S,v>*AF  
void CCaptureDlg::OnAbout() u N0fWj]  
{ IMrOPwjc  
 CAboutDlg dlg; (MiOrzT  
 dlg.DoModal(); QO1Gq9  
} -+@~*$ d  
MJpTr5Vs  
void CCaptureDlg::OnBrowse() ']e4 !  
{ ^F9zS `Yz2  
 CString str; b=\3N3OX  
 BROWSEINFO bi; F ) ~pw  
 char name[MAX_PATH]; ]JuB6o_L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >M85xjXP  
 bi.hwndOwner=GetSafeHwnd();  2_v+q  
 bi.pszDisplayName=name; u`,R0=<4  
 bi.lpszTitle="Select folder"; bO3KaOC8N  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *]?YvY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y,}43a0A  
 if(idl==NULL) 2]f.mq_PD  
  return; Xb 1^Oj  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @5GP;3T  
 str.ReleaseBuffer(); 2;r^~:  
 m_Path=str; G)|HFcE  
 if(str.GetAt(str.GetLength()-1)!='\\') IFoN<<7/2$  
  m_Path+="\\"; 5j5t?G;d,  
 UpdateData(FALSE); }kefrT  
} Qnh1s u5  
ED&KJnquWJ  
void CCaptureDlg::SaveBmp() 0LuY"(LR  
{ PP|xIAc  
 CDC dc; }gaKO 5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); w*@Z-'(j  
 CBitmap bm; )@M|YM1+  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~3]8f0^%m  
 int Height=GetSystemMetrics(SM_CYSCREEN); I@v.Hqg+7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); tvCTC ey  
 CDC tdc; :\We =oX  
 tdc.CreateCompatibleDC(&dc); kIo?<=F8T  
 CBitmap*pOld=tdc.SelectObject(&bm); $R36`wk  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dU n#'<g5  
 tdc.SelectObject(pOld); Py<vN!  
 BITMAP btm; ueo3i1  
 bm.GetBitmap(&btm); 'o9V0#$!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; f89<o#bm7h  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -W vAmi  
 BITMAPINFOHEADER bih; NKYyMHv6  
 bih.biBitCount=btm.bmBitsPixel; ` XY[ HK  
 bih.biClrImportant=0; r${a S@F  
 bih.biClrUsed=0; ePdzQsnVe  
 bih.biCompression=0; |9M y>8k(  
 bih.biHeight=btm.bmHeight; `r LMMYD=  
 bih.biPlanes=1; oWOZ0]H1  
 bih.biSize=sizeof(BITMAPINFOHEADER); :g_ +{4  
 bih.biSizeImage=size; FiL JF!  
 bih.biWidth=btm.bmWidth; AlV2tffY^  
 bih.biXPelsPerMeter=0; qIp`'.#m  
 bih.biYPelsPerMeter=0; dq&d>f1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 'KG`{K$  
 static int filecount=0; Hq8.O/Y"=  
 CString name; S_=uv)%a  
 name.Format("pict%04d.bmp",filecount++); $ E6uA}s  
 name=m_Path+name; VtFh1FDI\  
 BITMAPFILEHEADER bfh; @^@-A\7[KO  
 bfh.bfReserved1=bfh.bfReserved2=0; g`8|jg0]`I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \GP c_m:qL  
 bfh.bfSize=54+size; B$j,:^  
 bfh.bfOffBits=54; 54&2SU$kx  
 CFile bf; *z~Y*Q0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :=@[FXD4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C:cu1Y9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CJ b ~~  
  bf.WriteHuge(lpData,size); llJ)u!=5  
  bf.Close(); -)GfSk   
  nCount++; hJ :+*46  
 } AS;{{^mM(  
 GlobalFreePtr(lpData); 5+J/Qm8{bb  
 if(nCount==1) 7[\B{N9&W  
  m_Number.Format("%d picture captured.",nCount); 6(=:j"w0  
 else <j' #mUzd  
  m_Number.Format("%d pictures captured.",nCount); R_ }(p2  
  UpdateData(FALSE); 1GxYuTZ{  
} /uVB[Tk^  
Oh: -Y]m=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {3>^nMv@e  
{ >v{m^|QqB  
 if(pMsg -> message == WM_KEYDOWN) OZ&aTm :  
 { ?{'Q}%  
  if(pMsg -> wParam == VK_ESCAPE) V RL6F2 >6  
   return TRUE; #S5vX<"9  
  if(pMsg -> wParam == VK_RETURN) _ U\vHa$#  
   return TRUE; ~i4@sz&  
 } ^B/{  
 return CDialog::PreTranslateMessage(pMsg); |bh:x{h  
} 8VnZ@*  
P\R3/g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]_h"2|  
{ WJ@,f%=<~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2iu;7/  
  SaveBmp(); i || /=ai  
  return FALSE; +^.(3Aw  
} $f%_ 4 =  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sf LBi~*j  
 CMenu pop; s`{O-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1JM~Ls%Z  
 CMenu*pMenu=pop.GetSubMenu(0); .Qaqkb-Ty  
 pMenu->SetDefaultItem(ID_EXITICON); -4;u|0_  
 CPoint pt; %$08*bAtB7  
 GetCursorPos(&pt); & 3gni4@@  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1/z1~:Il  
 if(id==ID_EXITICON) t|/ /oEY  
  DeleteIcon(); 0y(d|;':  
 else if(id==ID_EXIT) `is6\RH  
  OnCancel(); SWu=n1J.?H  
 return FALSE; c{[d@jt O  
} ,^3D"Tky  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h )w<{/p(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W[YtNL;  
 AddIcon(); yF*JzE 7,  
 return res; Uc&0>_Z  
} wL*z+>5  
:Q%&:[2  
void CCaptureDlg::AddIcon() MRs8l  
{ P iN3t]2  
 NOTIFYICONDATA data; 6>l-jTM  
 data.cbSize=sizeof(NOTIFYICONDATA); ?p5Eo{B  
 CString tip; ' =oV  
 tip.LoadString(IDS_ICONTIP); nX   
 data.hIcon=GetIcon(0); l|DOsI'r  
 data.hWnd=GetSafeHwnd(); D%Wr/6X  
 strcpy(data.szTip,tip); 'h:4 Fzo<  
 data.uCallbackMessage=IDM_SHELL; '?QZ7A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %j=7e@   
 data.uID=98; Th-zMQ4  
 Shell_NotifyIcon(NIM_ADD,&data); UZ y  
 ShowWindow(SW_HIDE); U-k6ZV3&8  
 bTray=TRUE; f6DPah#  
} 5ewQjwW0  
bo]k9FC  
void CCaptureDlg::DeleteIcon() 9AS,-5;XQ  
{ )sW1a  
 NOTIFYICONDATA data; #0weN%  
 data.cbSize=sizeof(NOTIFYICONDATA); Rq;R{a  
 data.hWnd=GetSafeHwnd(); BKN]DxJ6  
 data.uID=98; -QRKDp  
 Shell_NotifyIcon(NIM_DELETE,&data); Jg7IGU(dct  
 ShowWindow(SW_SHOW); P afmHXx  
 SetForegroundWindow(); r8@:Ko= a  
 ShowWindow(SW_SHOWNORMAL); m0 `wmM  
 bTray=FALSE; }=wSfr9g  
}  pxP7yJL`  
'A4Lr  
void CCaptureDlg::OnChange() M5D,YC3<  
{ Xc'yz 2B  
 RegisterHotkey(); gp;(M~we  
} z. 7 UfLV9  
@T1-0!TM')  
BOOL CCaptureDlg::RegisterHotkey() 64[j:t=N  
{ ww=< =  
 UpdateData(); $+$+;1[  
 UCHAR mask=0; (xq25;|Y  
 UCHAR key=0; #*?a"  
 if(m_bControl) yBeSvsm  
  mask|=4; E-l>z%  
 if(m_bAlt) ='>k|s:  
  mask|=2; D*heYh  
 if(m_bShift) B>gC75  
  mask|=1; VYvHpsI  
  key=Key_Table[m_Key.GetCurSel()]; k4eV*e8  
 if(bRegistered){ }&ZO q'B  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); d[jxU/.p;  
  bRegistered=FALSE; =TU"B-*  
 } ^-rb&kW@:  
 cMask=mask; ]l`?"X|^  
 cKey=key; J/=b1{d"n  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ws'3*HAce  
 return bRegistered; P 3);R>j  
} izOtt^#DZt  
J/WPffqD  
  四、小结 4,UvTw*2z  
'lg6<M%#[  
  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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