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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: %rlMjF'tG  
   8 X Qo  
  一、实现方法 v-Tkp Yn  
U ,NGV0  
  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: a[Nm< qV05  
+=:_a$98  
#pragma data_seg("shareddata") \sz*M B  
HHOOK hHook =NULL; //钩子句柄 ]"/SU6#4:  
UINT nHookCount =0; //挂接的程序数目 cO$xT;kK  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 dbJ3E)rF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _h+7 KK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QLH!>9Ch  
static int KeyCount =0; EXMW,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 kXV;J$1  
#pragma data_seg() ~R&rQJJeJ  
7Kf  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 C7O8B;  
R_D&"&   
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 4a0Ud !Qcs  
Mw3$QRM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR !2Gua1z!CJ  
cKey,UCHAR cMask) $l2`@ia"  
{ <6Y|vEo!N  
 BOOL bAdded=FALSE; )DmydyQ'  
 for(int index=0;index<MAX_KEY;index++){ |8pSMgN  
  if(hCallWnd[index]==0){ P3.  
   hCallWnd[index]=hWnd; 7t+d+sQ-l  
   HotKey[index]=cKey; Gphy8~eS  
   HotKeyMask[index]=cMask; T+^Sa J  
   bAdded=TRUE; hraR:l D  
   KeyCount++; #W6 6`{>  
   break; _&~l,%)&  
  } zMRa <G7  
 } -:95ypi  
 return bAdded; X::@2{-@y  
}  )ut$644R  
//删除热键 j,Mbl"P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k-H6c  
{ *^%+PQ  
 BOOL bRemoved=FALSE; O=t~.]))  
 for(int index=0;index<MAX_KEY;index++){ [O<F`u"a  
  if(hCallWnd[index]==hWnd){ @ <3E `j'p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ tA^+RO4  
    hCallWnd[index]=NULL; O&MH5^I  
    HotKey[index]=0; 1d~d1Rd  
    HotKeyMask[index]=0; A@Q6}ESD  
    bRemoved=TRUE; ]isq}Qv~  
    KeyCount--; 9% C]s  
    break; +.&P$`;TZj  
   } vp2w^/])u  
  } De>e`./56  
 } }]H7uC!t   
 return bRemoved; 8!0fT}  
} 0r_~LN^|[  
i6P}MtC1  
JN:L%If  
  DLL中的钩子函数如下: z Ohv>a  
Dt<MEpbur  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) c0Bqm  
{ |||m5(`S  
 BOOL bProcessed=FALSE; L){V(*K '  
 if(HC_ACTION==nCode) =xDxX#3  
 { OwEV$Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 iZ>P>x\  
   switch(wParam) n-2!<`UFX  
   {  DLP@?]BBOA  
    case VK_MENU: akk*f+TD`  
     MaskBits&=~ALTBIT; Vpp$yM&?  
     break; W4$aX5ow$  
    case VK_CONTROL: `k>C%6FG$#  
     MaskBits&=~CTRLBIT; hxj\  
     break; 6\u. [2lE^  
    case VK_SHIFT: *^Zt)U1$|  
     MaskBits&=~SHIFTBIT; w>\oz  
     break;  ]Tb?z&  
    default: //judge the key and send message 0C.5Qx   
     break; .wp[uLE  
   } T59FRX  
   for(int index=0;index<MAX_KEY;index++){ 2q]ZI  
    if(hCallWnd[index]==NULL) 50dN~(;p  
     continue; tK[o"?2y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #'O9Hn({  
    { s-5 #P,Lw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wh8;:<|  
     bProcessed=TRUE; {ZSAPq4)L  
    } *J]p/<> {  
   } ~CHcbEWk)W  
  } ?]bx]Y;  
  else if((lParam&0xc000ffff)==1){ //有键按下 n $N M  
   switch(wParam) <m^a ?q^  
   { w)* H&8h@  
    case VK_MENU: Du +_dr^4  
     MaskBits|=ALTBIT; U\, N  
     break; 'hPW#*#W<  
    case VK_CONTROL: *g %bdO  
     MaskBits|=CTRLBIT; ^wc:qll  
     break; X^dasU{*  
    case VK_SHIFT: _.R]K$U  
     MaskBits|=SHIFTBIT; 88<d<)7t  
     break; !SE  
    default: //judge the key and send message 5 (!FQ  
     break; ZvQZD=,F  
   } }f_@@#KB?  
   for(int index=0;index<MAX_KEY;index++){ H"A@Q.'  
    if(hCallWnd[index]==NULL) >TM{2b,(p  
     continue; f3n^Sw&Q(Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sh5)36  
    { \!jz1`]&{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -hfkF+=U'  
     bProcessed=TRUE; g"Hl 30o  
    } ?D7zty+}^  
   } B5+Q%)52  
  } 5(\/ b<#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 AxH`4=3<  
   for(int index=0;index<MAX_KEY;index++){ ;qy;;usa  
    if(hCallWnd[index]==NULL) UroC8Tm  
     continue; cZ !$XXA`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A-.Wd7^~*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7O%^4D  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4 ;)t\9cy_  
   } vol (%wB  
  } kG9aH Ww  
 } T`j {2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /&G|.Cx  
} ZwY mR=  
k,'MmAz  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: gBWr)R  
a%a0/!U[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !mWm@ }Ujg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R>~I8k9mM  
v5e*R8/  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 6vTnm4  
IO7gq+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (4RtoYWW  
{ ge%QbU1J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) -Vb5d!(  
 { Isvb;VT9L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 eJn_gKWb  
  SaveBmp(); @`nG &U  
  return FALSE; 9 `bLQd  
 } wpC .!T  
 …… //其它处理及默认处理 !B#lZjW#  
} b&QI#w  
ek/zQM@%  
dblf , x  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 @].!}tz  
90Sras>F  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 3}3b@:<  
sK9RViqF\  
  二、编程步骤 t>LSP$  
/pU`-  
  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"; _ MB/p  
B]b/(Q+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9mn~57`y  
@q># ]8  
  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; VM&Ref4  
$_eJ@L#  
  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; VK,{Mu=.9  
9M1DE  
  5、 添加代码,编译运行程序。 .X)Wb{7  
@ZJ }lED3  
三、程序代码 :i {; 81V  
Qi=0[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #h9Gl@|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `D=d!!1eUi  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =TzJgx  
#if _MSC_VER > 1000 G;pmR^  
#pragma once $\1M"a}F  
#endif // _MSC_VER > 1000 ,!,M'<?"  
#ifndef __AFXWIN_H__ u#y)+A2&!  
#error include 'stdafx.h' before including this file for PCH CK|AXz+EN  
#endif cH:&S=>h  
#include "resource.h" // main symbols -`z%<)!Y  
class CHookApp : public CWinApp O}2/w2n  
{ `(P71T  
 public: [ybK  
  CHookApp(); :J x%K  
  // Overrides { ] 0T  
  // ClassWizard generated virtual function overrides ySDo(EI4  
  //{{AFX_VIRTUAL(CHookApp) |)0Ta 9~  
 public: ;l0%yg/}  
  virtual BOOL InitInstance(); Zy?!;`c*{  
  virtual int ExitInstance();  4m=0e  
  //}}AFX_VIRTUAL FzCXA=m  
  //{{AFX_MSG(CHookApp) 2~ETu&R:  
  // NOTE - the ClassWizard will add and remove member functions here. r~oUln<[  
  // DO NOT EDIT what you see in these blocks of generated code ! M$>Nd6,@N  
  //}}AFX_MSG '^7UcgugB  
  DECLARE_MESSAGE_MAP() X_bB6A6  
}; }vgM$o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +7 j/.R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {-]K!tWda  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w~pe?j_F$  
BOOL InitHotkey(); !Z{7X ^  
BOOL UnInit(); (G$Q\>  
#endif )$a6l8  
k,<7)-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0(Z:QqpU$  
#include "stdafx.h" ~q/~ u  
#include "hook.h" Nr)DU.f  
#include <windowsx.h> %Q.M& U  
#ifdef _DEBUG -{z[.v.p  
#define new DEBUG_NEW $3ZQ|X[|+  
#undef THIS_FILE t.O~RE  
static char THIS_FILE[] = __FILE__; _F4=+dT|  
#endif K$:btWSm  
#define MAX_KEY 100 Eg2jexl  
#define CTRLBIT 0x04 M)wNu  
#define ALTBIT 0x02 Ik A~+6UY  
#define SHIFTBIT 0x01 k!$$ *a*  
#pragma data_seg("shareddata") E(1G!uu<  
HHOOK hHook =NULL; |DVFi2   
UINT nHookCount =0; Ic&YiATj  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey yOXEP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j b'M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M\JAB ;A  
static int KeyCount =0; n? =O@yq  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift VJCj=jX  
#pragma data_seg() R{aqn0M  
HINSTANCE hins; ZdPqU \G^q  
void VerifyWindow(); BV/ ^S.~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) H ]](xYy.  
//{{AFX_MSG_MAP(CHookApp) *g:Dg I 2  
// NOTE - the ClassWizard will add and remove mapping macros here. pV 8U`T  
// DO NOT EDIT what you see in these blocks of generated code! e~,+rM  
//}}AFX_MSG_MAP opzlh@R 3  
END_MESSAGE_MAP() ]ERAt^$0  
W4(  
CHookApp::CHookApp() R@>^t4#_Q0  
{ gd7! +6  
 // TODO: add construction code here, 6-5{7E}/b  
 // Place all significant initialization in InitInstance od,,2pwK+  
} KRP6b:+4L  
+J A\by  
CHookApp theApp; .;,,{ ;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sdd%u~4,X  
{ qzZ;{>_f  
 BOOL bProcessed=FALSE; t)O]0) s  
 if(HC_ACTION==nCode) ku>Bxau4>  
 { W!=ur,F+  
  if((lParam&0xc0000000)==0xc0000000){// Key up fti0Tz'  
   switch(wParam) i`}9VaUG  
   { /%{CJ0Y  
    case VK_MENU: h*Mi/\  
     MaskBits&=~ALTBIT; (58r9WhS  
     break; C9FAX$$^(Y  
    case VK_CONTROL: #0^a-47PA<  
     MaskBits&=~CTRLBIT; $0~1;@`rQ6  
     break; 5~#oQ&  
    case VK_SHIFT: tm_\(  
     MaskBits&=~SHIFTBIT; /P/0\3TCi  
     break; G#E8xA"{/  
    default: //judge the key and send message HuN_$aP  
     break; ,Vz-w;oDn  
   } tpgD{BY^wJ  
   for(int index=0;index<MAX_KEY;index++){ .H&XP W  
    if(hCallWnd[index]==NULL) U:PtRSdn!b  
     continue; <<@F{B7h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o?#-Tkb  
    { V-63   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -xyY6bxL  
     bProcessed=TRUE; w`=XoYQl~*  
    } s4=EyBI  
   } T=g2gmo9  
  } 5pff}Ru`  
  else if((lParam&0xc000ffff)==1){ //Key down #.,LWL]  
   switch(wParam) N~?#Qh|ZnU  
   { mK^E@uxN  
    case VK_MENU: }%y5<n*v\  
     MaskBits|=ALTBIT; {t]8#[lo  
     break; ?+{_x^  
    case VK_CONTROL: 5+(Cp3  
     MaskBits|=CTRLBIT; ,~Lx7 5{  
     break; /(%!txSNEt  
    case VK_SHIFT: }Cb-7/  
     MaskBits|=SHIFTBIT; f]Rh<N$  
     break; TeJ=QpGW2  
    default: //judge the key and send message  -f<}lhmQ  
     break; p@@*F+  
   } _@_EQ!=  
   for(int index=0;index<MAX_KEY;index++) h=kC3ot\  
   { LGYg@DR  
    if(hCallWnd[index]==NULL) G//hZwf0  
     continue; N{a=CaYi+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  |vBy=:  
    { YlZ&4   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dTwYDV}:  
     bProcessed=TRUE; 4 *. O%  
    } wS|hc+1  
   } 2LCOB&-Ww  
  } }YU\}T-P  
  if(!bProcessed){ J)H*tzg  
   for(int index=0;index<MAX_KEY;index++){ -O $!sFmY  
    if(hCallWnd[index]==NULL) CX]L'  
     continue; m`tX&K#-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5'|W(yR}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X'/'r.b6  
   } Fg i;%  
  } 8 9maN  
 } ]r\!Z <<(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3/,}&SX  
} yQN^F+.  
'sa>G  
BOOL InitHotkey() YQR[0Y&e=  
{ Bf3 QB]9  
 if(hHook!=NULL){ nIfp0U*  
  nHookCount++; n8z++ T&  
  return TRUE; !-JvVdM;(  
 } g$JlpD&  
 else A(n3<(O/{Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ns\};j?TU*  
  if(hHook!=NULL) }LoMS<O-[  
   nHookCount++; MG^YT%f  
  return (hHook!=NULL); TRE D_6  
} zNg[%{mz  
BOOL UnInit() ,@zw  
{ nPjK=o`KR  
 if(nHookCount>1){ 3sl6$NKo  
  nHookCount--; [|\#cVWs  
  return TRUE; ^W~8)Rbf  
 } Dnd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 64Tb,AL_  
 if(unhooked==TRUE){ :OA;vp~$x  
  nHookCount=0; blkPsp)m"  
  hHook=NULL; +DE;aGQ.z?  
 } R%`fd *g  
 return unhooked; AN)r(86L  
} fk\]wFj  
mA^3?y j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #9{2aRCJ  
{ UQbk%K2  
 BOOL bAdded=FALSE; .S]*A b  
 for(int index=0;index<MAX_KEY;index++){ 6lUC$B Y  
  if(hCallWnd[index]==0){ ~m[Gp;pL  
   hCallWnd[index]=hWnd; .Y^pDR12  
   HotKey[index]=cKey; ; FHnu|  
   HotKeyMask[index]=cMask; l9 &L$,=  
   bAdded=TRUE; Yaz/L)Y;R  
   KeyCount++; 3jHE,5m  
   break; 7R,;/3wWjG  
  } ^4et; F%  
 } 9ZuKED  
 return bAdded; 3r[ s_Y*  
} apnpy\in  
f*VXg[&\\F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (B03f$8}*_  
{ ]2A2<Q_,  
 BOOL bRemoved=FALSE; aq#F  
 for(int index=0;index<MAX_KEY;index++){ >4os%T  
  if(hCallWnd[index]==hWnd){ Q`Rn,kCVy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ScmwHid:\  
    hCallWnd[index]=NULL; n$E$@  
    HotKey[index]=0; MooxT7  
    HotKeyMask[index]=0; t$?#@8Yk  
    bRemoved=TRUE;  \+:`nz3m  
    KeyCount--; x{/-&`F  
    break; ]@}o"Td  
   } q#\B}'I{  
  } +Eel|)Z*Q  
 } [ u ^/3N  
 return bRemoved; r,Msg&rT  
} .:e#!~Ki  
4M+f#b1  
void VerifyWindow() IYa(B+nB)  
{ N,:G5WxW  
 for(int i=0;i<MAX_KEY;i++){ nswhYSX  
  if(hCallWnd!=NULL){ 8<@X=Z  
   if(!IsWindow(hCallWnd)){ C 'S_M@I=  
    hCallWnd=NULL; '$5d6?BC`3  
    HotKey=0; PF+Or  
    HotKeyMask=0; 6o*'Q8h  
    KeyCount--; 'ITZz n*  
   } YdUcO.V  
  } VFm)!'=I  
 } !(3[z>  
} Dj6^|R$z&  
_qh \  
BOOL CHookApp::InitInstance() 9fO E .  
{ L=P8;Gj)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^==Tv+T9U  
 hins=AfxGetInstanceHandle(); v?n# C  
 InitHotkey(); 735l&(3A\  
 return CWinApp::InitInstance(); 2EO9IxIf  
} E,ooD3$h  
`S4G+j>u6  
int CHookApp::ExitInstance() @gQ?cU7  
{ K1-RJj\L  
 VerifyWindow(); fgHsg@33N  
 UnInit(); "#iO{uMWb  
 return CWinApp::ExitInstance(); ZVit] 3hd  
} 1&Ma`M('  
uzLm TmM+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q6x}\$mL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) iTF%}(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ > kwhZ/x  
#if _MSC_VER > 1000 )QmmI[,tq  
#pragma once |:u5R%  
#endif // _MSC_VER > 1000 g;:3I\ L  
4#I=n~8a  
class CCaptureDlg : public CDialog "cbJ{ G1pk  
{ !"aGo1 $$  
 // Construction v[?gM.SF  
 public: :R3&R CTZ  
  BOOL bTray; )0Vj\>  
  BOOL bRegistered; ucbtPTFYvr  
  BOOL RegisterHotkey(); zB\ 8<97 C  
  UCHAR cKey; %:dd#';g  
  UCHAR cMask; .mOm@<Xdg  
  void DeleteIcon(); A.YK=_J  
  void AddIcon(); )ub!tm  
  UINT nCount; VRHS 4  
  void SaveBmp(); &?']EcU5h9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L$jii  
  // Dialog Data R1.Yx?  
  //{{AFX_DATA(CCaptureDlg) ]n$ v ^  
  enum { IDD = IDD_CAPTURE_DIALOG }; z_8Bl2tl  
  CComboBox m_Key; 7JY9#+?p>  
  BOOL m_bControl; |@?='E?h  
  BOOL m_bAlt; TQvjU!>  
  BOOL m_bShift; $0]5b{i]  
  CString m_Path; 8zwH^q[`r  
  CString m_Number; xx?0Ftuq  
  //}}AFX_DATA 'SIc2H  
  // ClassWizard generated virtual function overrides j}8^gz]  
  //{{AFX_VIRTUAL(CCaptureDlg) -7EwZRS@9  
 public: =s S=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); % 5BSXAc  
 protected: >as+#rz1p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Aiqb*v$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [ .3Gb}B  
  //}}AFX_VIRTUAL &((04<@e  
  // Implementation IY?o \vC  
 protected: p%OVl[^jp  
  HICON m_hIcon; %,d+jBM  
  // Generated message map functions `"$9L[>  
  //{{AFX_MSG(CCaptureDlg) wOH 3[SKo  
  virtual BOOL OnInitDialog(); TdoH(( nY  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u R!'v  
  afx_msg void OnPaint(); ZV07;`I  
  afx_msg HCURSOR OnQueryDragIcon(); /4+*!X  
  virtual void OnCancel(); m^^#3*qa  
  afx_msg void OnAbout(); 0BOL0<Wq  
  afx_msg void OnBrowse(); V0gu0+u~R  
  afx_msg void OnChange(); UZgrSX {  
 //}}AFX_MSG ;[|+tO_  
 DECLARE_MESSAGE_MAP() _G)x\K]N  
}; nH[>Sff$  
#endif mUiJ@  
. ;D'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file w *o _s  
#include "stdafx.h" d~b @F&mf  
#include "Capture.h" TQ5kT?/{  
#include "CaptureDlg.h" >EgMtZ88.<  
#include <windowsx.h> 1DF8-|+  
#pragma comment(lib,"hook.lib") I#zL-RXT  
#ifdef _DEBUG v/`#Gu^P  
#define new DEBUG_NEW H#bu3*'  
#undef THIS_FILE fl*49-d  
static char THIS_FILE[] = __FILE__; ?Y9VviC  
#endif vNU[K%U  
#define IDM_SHELL WM_USER+1 &2W`dEv]?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h:vI:V[/X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M/}i7oS]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +ZRm1q   
class CAboutDlg : public CDialog g;y*F;0@  
{ S's I[?\x  
 public: }oii|=,#^  
  CAboutDlg(); k:1|Z+CJ  
  // Dialog Data qPCI@5n3T?  
  //{{AFX_DATA(CAboutDlg) ITjg]taD  
  enum { IDD = IDD_ABOUTBOX }; m9Dg%\B  
  //}}AFX_DATA XJ3aaMh"  
  // ClassWizard generated virtual function overrides l +O\oD?-  
  //{{AFX_VIRTUAL(CAboutDlg) Aac7k m  
 protected: _6 yrd.H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mS]soYTQ  
  //}}AFX_VIRTUAL {.UK{nA?sm  
  // Implementation H"|oI|~  
 protected: QFEc?sEe  
  //{{AFX_MSG(CAboutDlg) a+n?y)u  
  //}}AFX_MSG w)gMJX/0yw  
  DECLARE_MESSAGE_MAP() g^:7mG6C  
}; 75']fFO@!  
=5h ,ZB2A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4rNuAK`2  
{ %#7^b=;=  
 //{{AFX_DATA_INIT(CAboutDlg) f<@`{oP@  
 //}}AFX_DATA_INIT et6@);F  
} &>hln<a>  
Qexv_:C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <U""CAE  
{ Vj_z"t7q  
 CDialog::DoDataExchange(pDX); XN'<H(G  
 //{{AFX_DATA_MAP(CAboutDlg) =,LhMy  
 //}}AFX_DATA_MAP "J3n_3+  
} -O[9{`i]  
Eb\SK"8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F#7A6|  
 //{{AFX_MSG_MAP(CAboutDlg) 74%Uojl"  
 // No message handlers +*$@ K'VL  
 //}}AFX_MSG_MAP {`[u XH?3d  
END_MESSAGE_MAP() &$_#{?dPt  
T@DT|lTI  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ldWr-  
: CDialog(CCaptureDlg::IDD, pParent) c(!{_+q"  
{ B,ZLX/c9  
 //{{AFX_DATA_INIT(CCaptureDlg) u_ym=N57`  
  m_bControl = FALSE; C.{z+  
  m_bAlt = FALSE; x^6sjfAW  
  m_bShift = FALSE; VXu1Y xY  
  m_Path = _T("c:\\"); K#'{Ko  
  m_Number = _T("0 picture captured."); /%h<^YDBf  
  nCount=0; y Ide]  
  bRegistered=FALSE; Pb@9<NXm'  
  bTray=FALSE; 0D48L5kH#'  
 //}}AFX_DATA_INIT J"]P" `/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *'ex>4^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4 O~zkg  
} cvQ MZ,p  
E.OL_\  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ADN  
{ ZG)%vB2c  
 CDialog::DoDataExchange(pDX); a`uHkRX )U  
 //{{AFX_DATA_MAP(CCaptureDlg) t0gLz J  
  DDX_Control(pDX, IDC_KEY, m_Key); }\)O1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); [|\BuUT'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0p' =Vel{}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); IH0qx_;P&  
  DDX_Text(pDX, IDC_PATH, m_Path); Fm{`?!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 66l$}+|Zzc  
 //}}AFX_DATA_MAP 7\1bq&a<  
} *%xmCP J  
kkE1CHY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RzLbPSTQ  
//{{AFX_MSG_MAP(CCaptureDlg) )6:nJ"j#  
 ON_WM_SYSCOMMAND() _,;|,  
 ON_WM_PAINT() f_GqJ7Gk]  
 ON_WM_QUERYDRAGICON() Wo+'j $k  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) U.HeIJ#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  7ehs+GI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :TzHI    
//}}AFX_MSG_MAP _4jRUsvjY  
END_MESSAGE_MAP() s'|^6/  
U[UjL)U  
BOOL CCaptureDlg::OnInitDialog() -I#1xJU  
{ S+EC!;@Xg  
 CDialog::OnInitDialog(); Ou<Vg\Mu  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J_^Ml)@iy  
 ASSERT(IDM_ABOUTBOX < 0xF000); Fn~?YN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Dpa PRA)x  
 if (pSysMenu != NULL) 71ctjU`U2  
 { K)C9)J<  
  CString strAboutMenu; Rv T>{G~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8}kY^"*&X  
  if (!strAboutMenu.IsEmpty()) lC ^NhQi  
  { Be(h x  
   pSysMenu->AppendMenu(MF_SEPARATOR); Vg)]F+E  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HJ2r~KIw  
  } *VF UC:  
 } H1FSN6'  
 SetIcon(m_hIcon, TRUE); // Set big icon nRmZu\(Ow|  
 SetIcon(m_hIcon, FALSE); // Set small icon W=$d|*$  
 m_Key.SetCurSel(0); tNI~<#+lg  
 RegisterHotkey(); Ol9'ZB|R  
 CMenu* pMenu=GetSystemMenu(FALSE); wtDy-H n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ` qqUuFMM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); C=6Vd  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); BEkxH.   
 return TRUE; // return TRUE unless you set the focus to a control ]_yk,}88d  
} `4'['x  
[D=3:B&f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )o<rU[oD]C  
{ 5!T\L~tyt  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  m%-  
 { B|-E3v:f 4  
  CAboutDlg dlgAbout; Jm|eZDp  
  dlgAbout.DoModal(); Ub8|x]ix  
 } DV(^h$1_  
 else 4{d!}R  
 { p<\yp<g  
  CDialog::OnSysCommand(nID, lParam); `4& GumG  
 } b NBpt}$  
} V3'QA1$  
h-Q3q:  
void CCaptureDlg::OnPaint() , wT$L 3  
{ 4%TY` II  
 if (IsIconic()) fCL5Et  
 { x>^r%<WbX  
  CPaintDC dc(this); // device context for painting p xrd D7  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p2;-*D  
  // Center icon in client rectangle xe;1D'(   
  int cxIcon = GetSystemMetrics(SM_CXICON); |5 sI=?p&t  
  int cyIcon = GetSystemMetrics(SM_CYICON); 6^pddGIG  
  CRect rect; xG05OqKpE  
  GetClientRect(&rect); YY (,H!  
  int x = (rect.Width() - cxIcon + 1) / 2; h[SuuW  
  int y = (rect.Height() - cyIcon + 1) / 2; XAV|xlfm  
  // Draw the icon cCd2f>EHw  
  dc.DrawIcon(x, y, m_hIcon); );*A$C9RA  
 } E}aTH  
 else 821@qr|`e  
 { mJaWzR  
  CDialog::OnPaint(); }];8v+M  
 } + j._NRXRH  
} /h=:heS4$  
V/Q~NX N  
HCURSOR CCaptureDlg::OnQueryDragIcon() \lVxlc0{?  
{ `b^eRnpR  
 return (HCURSOR) m_hIcon; OchIEF "N  
} 72qbxPY13h  
3_JxpQg  
void CCaptureDlg::OnCancel() E"e<9  
{ $= /.oh  
 if(bTray) Hf ]aA_:   
  DeleteIcon(); $0C1';=^}  
  CDialog::OnCancel(); 8}FZ1h2 4  
} beyC't  
Farcd!}  
void CCaptureDlg::OnAbout() /`YHPeXu  
{ #\kYGr-G)  
 CAboutDlg dlg; ITa8*Myj  
 dlg.DoModal(); #WD} XOA  
} fHek!Jv.  
uUXvBA?l  
void CCaptureDlg::OnBrowse() K~p\B  
{ ENwDW#U9  
 CString str; ln#Jb&u  
 BROWSEINFO bi; DGMvYNKTj  
 char name[MAX_PATH]; %UuV^C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); t&+f:)n  
 bi.hwndOwner=GetSafeHwnd(); "oX@Z^  
 bi.pszDisplayName=name; 5`oVyxJ<  
 bi.lpszTitle="Select folder"; pCOr{I\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =k#SQ/@  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); EGYYSoBLU  
 if(idl==NULL) {FO>^~>l  
  return; 6$TE-l  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xWX1P%`  
 str.ReleaseBuffer(); jX5lwP Q|F  
 m_Path=str; 0?3Ztdlb  
 if(str.GetAt(str.GetLength()-1)!='\\') >'4Bq*5>  
  m_Path+="\\"; %xE\IRlR  
 UpdateData(FALSE); )v&r^DR_  
} b&BSigrvou  
+@),Fk_  
void CCaptureDlg::SaveBmp() [ay~l%x  
{ }Wf\\  
 CDC dc; 1{B^RR.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Fj<#*2{]B  
 CBitmap bm; H"8fnN=xB  
 int Width=GetSystemMetrics(SM_CXSCREEN); LJK<Xen  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;h> s=D,r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (P {o9  
 CDC tdc; V QE *B  
 tdc.CreateCompatibleDC(&dc); 4R5+"h:  
 CBitmap*pOld=tdc.SelectObject(&bm); V:*QK,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^;0.P)yGA  
 tdc.SelectObject(pOld); G*_$[|H  
 BITMAP btm; ; ]GSVv:  
 bm.GetBitmap(&btm); SsiKuoxk  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; =}txcA+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); juPW!u  
 BITMAPINFOHEADER bih; iJ HOLz"!  
 bih.biBitCount=btm.bmBitsPixel; H~1&hF"d  
 bih.biClrImportant=0; -g'[1  
 bih.biClrUsed=0; pj.}VF!d  
 bih.biCompression=0; B d$i%.r  
 bih.biHeight=btm.bmHeight; @RW=(&<1  
 bih.biPlanes=1; :hYV\8 $  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]YcM45xg  
 bih.biSizeImage=size; `N%q^f~  
 bih.biWidth=btm.bmWidth; ^<fN  
 bih.biXPelsPerMeter=0; oTj9/r  
 bih.biYPelsPerMeter=0; c`w YQUg(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8KKI.i8`  
 static int filecount=0; F+r3~T%  
 CString name; zCxr]md  
 name.Format("pict%04d.bmp",filecount++); {S4^;Va1  
 name=m_Path+name; Iuk!A?XV  
 BITMAPFILEHEADER bfh; '&{`^l/ MH  
 bfh.bfReserved1=bfh.bfReserved2=0; |T:' G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e1ru#'z  
 bfh.bfSize=54+size; >gqM|-uY  
 bfh.bfOffBits=54; MM8r*T4g/  
 CFile bf; }Z5#{Sd  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D_fgxl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); q~9Y&>D  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Z6%Hhk[  
  bf.WriteHuge(lpData,size); ndEW$?W,  
  bf.Close(); ||TKo967]  
  nCount++; Q C?*O?~#  
 } QGE)Xn#_bN  
 GlobalFreePtr(lpData); uY+N163i  
 if(nCount==1) GmoY~}cg~  
  m_Number.Format("%d picture captured.",nCount); NLZTIZCK  
 else >q0c!,Ay  
  m_Number.Format("%d pictures captured.",nCount); ,Q~C F;qe  
  UpdateData(FALSE); |` gSkv  
} zb/w^~J_i  
6A$ \I44  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |Rk$u  
{ G%N3h'zDi  
 if(pMsg -> message == WM_KEYDOWN) ^M60#gJ  
 { -z%| Jk  
  if(pMsg -> wParam == VK_ESCAPE) ,<]X0;~oB  
   return TRUE; B 14Ziopww  
  if(pMsg -> wParam == VK_RETURN) <{U "0jY!9  
   return TRUE; 48 DC  
 } 5N=QS1<$5  
 return CDialog::PreTranslateMessage(pMsg); gKK*` L~  
} {VOLUC o 4  
RM2<%$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;  ntq%  
{ kqJ \kd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '{9nQ DgT  
  SaveBmp();  )L}6to  
  return FALSE; 78't"2>  
} 6{/HNEI*1  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E>xd*23+\  
 CMenu pop;  #P8R  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AN ;SRl  
 CMenu*pMenu=pop.GetSubMenu(0); 5e^t;  
 pMenu->SetDefaultItem(ID_EXITICON); (gd+-o4  
 CPoint pt; ]mEY/)~7  
 GetCursorPos(&pt); S+LE ASOr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sBozz#  
 if(id==ID_EXITICON) :sD/IM",},  
  DeleteIcon(); R{zAs?j  
 else if(id==ID_EXIT) Hk)IV"[R  
  OnCancel(); A|!u`^p  
 return FALSE; nZ>8r  
} +AVYypql8K  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cfn\De%.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 1p#O(o  
 AddIcon(); 24u;'i-y5  
 return res; @"[xX}xK;  
} JVO,@~~  
 [o]^\a y  
void CCaptureDlg::AddIcon() Sl@$  
{ <[9{Lg*D  
 NOTIFYICONDATA data; ?2D1gjr  
 data.cbSize=sizeof(NOTIFYICONDATA); }%z {tn  
 CString tip; ,dhSc<:LT  
 tip.LoadString(IDS_ICONTIP); !KiN} p  
 data.hIcon=GetIcon(0); _=ani9E]uF  
 data.hWnd=GetSafeHwnd(); |TCHPKN  
 strcpy(data.szTip,tip); u(W%snl  
 data.uCallbackMessage=IDM_SHELL; {Vy2uow0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &p>VTD  
 data.uID=98; *`]LbS  
 Shell_NotifyIcon(NIM_ADD,&data); d51.Tbt#%7  
 ShowWindow(SW_HIDE); &_mOw.  
 bTray=TRUE; [kfLT::mT  
} bB01aiUw@l  
B&J;yla6`d  
void CCaptureDlg::DeleteIcon() )TNAgTmqK  
{ obYXDj2  
 NOTIFYICONDATA data; F' eV%g  
 data.cbSize=sizeof(NOTIFYICONDATA); @=@7Uu-  
 data.hWnd=GetSafeHwnd(); 1:2 t4}  
 data.uID=98; Q a(>$.h  
 Shell_NotifyIcon(NIM_DELETE,&data); i9KQpWG:  
 ShowWindow(SW_SHOW); //9M~qHa"  
 SetForegroundWindow(); yk1.fxik'  
 ShowWindow(SW_SHOWNORMAL); v;=F $3  
 bTray=FALSE; Tk(ciwB  
} s d -5AE  
["N{6d&Q  
void CCaptureDlg::OnChange() K5; /  
{ {(o$? =  
 RegisterHotkey(); U-uBz4Gha  
} %`rZ]^H  
N_#QS}H  
BOOL CCaptureDlg::RegisterHotkey() OMaG*fb=  
{ ?!PpooYK  
 UpdateData(); zT;F4_p3G-  
 UCHAR mask=0; +k@$C,A  
 UCHAR key=0; :a YbP,mE  
 if(m_bControl) 1: cD\  
  mask|=4; Ns^[Hb[b'  
 if(m_bAlt) /, G-1E  
  mask|=2; wWaO"N]  
 if(m_bShift) (_2;}eg  
  mask|=1; )_$F/ug  
  key=Key_Table[m_Key.GetCurSel()]; H}TzNs  
 if(bRegistered){ a>1_|QB.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); XJ\ j0  
  bRegistered=FALSE; p-p]dV  
 } $9_yD&&  
 cMask=mask; zqd_^  
 cKey=key; h/T^+U?-<  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2(5HPRQ  
 return bRegistered; #dcfQ  
} /uXEh61$8  
Kwc~\k  
  四、小结 Tyc`U&  
V\C$/8v  
  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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