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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: pb=yQ}.  
  07qL@![!  
  一、实现方法 W6L}T,epX  
[y1 x`WOk9  
  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: [cvtF(,  
JN<IMH  
#pragma data_seg("shareddata") "M4 gl  
HHOOK hHook =NULL; //钩子句柄 Ilv _.  
UINT nHookCount =0; //挂接的程序数目 _5SA(0D#9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 "%fvA;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D$PR<>=y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8VLD yX2-  
static int KeyCount =0; OVf%m~%&s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (d$ksf_[%f  
#pragma data_seg() Kk<MS$Ov  
p'`pO"EO  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 O"~BnA`dJ  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Hpq?I-g<^  
z\r|5Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR *u?N{LkqS  
cKey,UCHAR cMask) [I4&E >  
{ @T 8$/  
 BOOL bAdded=FALSE; =VM4Q+'K  
 for(int index=0;index<MAX_KEY;index++){ pi?[jU[Tn  
  if(hCallWnd[index]==0){ ,?ci+M)  
   hCallWnd[index]=hWnd; z{ydP Ra  
   HotKey[index]=cKey; (#%R'9R v  
   HotKeyMask[index]=cMask; G2e0\}q  
   bAdded=TRUE; `Wy8g?d;bn  
   KeyCount++; Tv`-h  
   break; kr6^6I.  
  } +oe%bk|A  
 } 84UI)nE:Q  
 return bAdded; ?~s23%E  
} _M9-n  
//删除热键 7l|D!`BS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2$%E:J+2:$  
{ \`$RY')9|!  
 BOOL bRemoved=FALSE; ~lB:xVzn  
 for(int index=0;index<MAX_KEY;index++){ R6/vhze4L2  
  if(hCallWnd[index]==hWnd){ 'q9='TOk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RmcQGQ  
    hCallWnd[index]=NULL; K^fH:pV  
    HotKey[index]=0; k| Ye[GM*  
    HotKeyMask[index]=0; hY-;Vh0J  
    bRemoved=TRUE; SFRQpQ06  
    KeyCount--;  LAfv1  
    break; o,;Hb4Eu  
   } y&8kORz;?  
  } gBCO>nJws  
 } ~76qFZe-  
 return bRemoved; *g;4?_f  
} 0'O*Y ]h+  
:KL5A1{  
K%/:V  
  DLL中的钩子函数如下: Z$&i"1{  
dJYQdo^X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Bm&%N?9  
{ h.D*Y3=<  
 BOOL bProcessed=FALSE; .ECT  
 if(HC_ACTION==nCode) ?Pw(  
 { !;ipLC;e}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "8|a4Y+F  
   switch(wParam) P-~kxb9aa  
   {  =f*Wj\  
    case VK_MENU: WPzq?yK  
     MaskBits&=~ALTBIT; >:yU bo)  
     break; 4:S?m(ah/  
    case VK_CONTROL: x&PVsXdt5m  
     MaskBits&=~CTRLBIT; ,@*Srrw  
     break; uY'77,G_J  
    case VK_SHIFT: qqR8E&Y{  
     MaskBits&=~SHIFTBIT; fR6.:7&  
     break; %juR6zB%8  
    default: //judge the key and send message XK7$Xbd  
     break; j/+e5.EX/  
   } jaq`A'o5  
   for(int index=0;index<MAX_KEY;index++){ W nLMa|e  
    if(hCallWnd[index]==NULL) [~_()i=Y  
     continue; $pO gFA1'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +bv-!rf  
    { Ar:ezA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2UGnRZ8:1Y  
     bProcessed=TRUE; )^'g2gVK+p  
    } Z(=U ZI?  
   } t@1 bu$y  
  } zjVQ\L  
  else if((lParam&0xc000ffff)==1){ //有键按下 !04zWYHo  
   switch(wParam) !<P|:Oo*Dl  
   { E6FT*}Q  
    case VK_MENU: mtQlm5l  
     MaskBits|=ALTBIT; ejuw+@ _  
     break; k_}aiHdG  
    case VK_CONTROL: bEz1@"~ p  
     MaskBits|=CTRLBIT; %]15=7#'y  
     break; 5/>W(,5}  
    case VK_SHIFT: !=w&=O0(  
     MaskBits|=SHIFTBIT; *tD`X( K  
     break; (T]<  
    default: //judge the key and send message t/4&=]n\u  
     break; ")cJA f  
   }  #mDeA>b  
   for(int index=0;index<MAX_KEY;index++){ &/7D4!N]  
    if(hCallWnd[index]==NULL) 7^|,l  
     continue; ~&?{hd.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (,5,}  
    { UZ"jQJQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n2#Yw}7^,o  
     bProcessed=TRUE; e<;^P(g`E  
    } 68k  
   } _,m|gr ,S  
  } m)aNuQvy:Z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 fEB>3hI  
   for(int index=0;index<MAX_KEY;index++){ _Ka6! 9  
    if(hCallWnd[index]==NULL) D<35FD,  
     continue; ue;o:>G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m.K@g1G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); apxY2oE&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P}kp_l27  
   } ?B!=DC@?H  
  } Zoi\r  
 } 7kZ-`V|\.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s^n}m#T  
} k]<E1 c/  
uuA q\YZy/  
  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: 2W_p)8t> b  
.<Lbv5m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lW!}OzE(m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )O~V3a  
!7KSNwGu  
  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: GkT:7`|C  
.1&~@e%=-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }zkMo ?  
{ *yx&4)Or  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) dcGs0b  
 { M^E\L C  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分  GT)63|  
  SaveBmp(); wLDWD,"K  
  return FALSE; bJz}\[z  
 } O" <W<l7Q  
 …… //其它处理及默认处理 -or^mNB_z  
} Y8Bc &q}  
hLZ<h7:  
opKk#40  
  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。 (np %urx!  
/_`f b)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。 &3nbmkM  
@4'bI)  
  二、编程步骤 :RH0.5)  
DeAi'"&  
  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"; BJdH2qREN  
ygvX}q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >brf7h  
Ev R6^n/  
  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; @"\j]ZEnY  
Bj ~bsT@a.  
  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; uP:Y[$O  
<#hltPyh  
  5、 添加代码,编译运行程序。 ):Vzv  
JE<zQf(&  
三、程序代码 Zy>iaG9}  
*f?z$46  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Gg\805L@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wQ4IQ!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #s!q(Rc  
#if _MSC_VER > 1000 q Z,7q  
#pragma once 3y9K'  
#endif // _MSC_VER > 1000 7q'_]$  
#ifndef __AFXWIN_H__ x*EzX4$x  
#error include 'stdafx.h' before including this file for PCH _msV3JBr  
#endif oj6b33z  
#include "resource.h" // main symbols _m  *8f\  
class CHookApp : public CWinApp >~g(acH%`x  
{ L+c7.l.yT  
 public: &!y7PWHJ  
  CHookApp(); ~1NK@=7T  
  // Overrides 2 f" =f^rf  
  // ClassWizard generated virtual function overrides }w#Ek=,s#o  
  //{{AFX_VIRTUAL(CHookApp) 9'qU4I  
 public: Y SvZ7G(m>  
  virtual BOOL InitInstance(); '%u7XuU-]  
  virtual int ExitInstance(); [Ipg",Su;f  
  //}}AFX_VIRTUAL r@2{>j8  
  //{{AFX_MSG(CHookApp) jWg7RuN  
  // NOTE - the ClassWizard will add and remove member functions here. }SdI _sLe  
  // DO NOT EDIT what you see in these blocks of generated code ! g"60{  
  //}}AFX_MSG #q06K2  
  DECLARE_MESSAGE_MAP() uA} w?;  
}; < O5r|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jL|y4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?HP54G<{xz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ],fu#pi=]  
BOOL InitHotkey(); $/*6tsR  
BOOL UnInit(); Tr^Egw]  
#endif T[z]~MJL  
nTJ-1A7EP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3 e19l!B  
#include "stdafx.h" 6hE. i x  
#include "hook.h" ,+u.FQv~  
#include <windowsx.h> =1JS6~CTLN  
#ifdef _DEBUG t Z_ni}  
#define new DEBUG_NEW "!9hcv- ;  
#undef THIS_FILE Gj~1eS  
static char THIS_FILE[] = __FILE__; 8>E_bxC  
#endif n>)'!   
#define MAX_KEY 100 0g-bApxz*&  
#define CTRLBIT 0x04 X"hoDg  
#define ALTBIT 0x02 sG/mmZHYzr  
#define SHIFTBIT 0x01 9(9+h]h+3  
#pragma data_seg("shareddata") wIrjWU2  
HHOOK hHook =NULL; Vr1Wr%  
UINT nHookCount =0; $a.!X8sHB.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l1_Tr2A}7/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT UN~dzA~V  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :QndeUw  
static int KeyCount =0; Nh I&wl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _h% :Tu  
#pragma data_seg() $=x1_  
HINSTANCE hins; !besMZ  
void VerifyWindow(); ;B35E!QJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) YWV"I|Z  
//{{AFX_MSG_MAP(CHookApp) U{IY F{;@  
// NOTE - the ClassWizard will add and remove mapping macros here. c]#+W@$  
// DO NOT EDIT what you see in these blocks of generated code! `5[$8;  
//}}AFX_MSG_MAP Q^&oXM'x/i  
END_MESSAGE_MAP() B?Vr9H7n  
S~ dD;R  
CHookApp::CHookApp() fp jy[$8  
{ #Ub"Ii  
 // TODO: add construction code here, wD|3Czc  
 // Place all significant initialization in InitInstance "[PxLq5  
} Zu4|1 W  
h>'9-j6B  
CHookApp theApp; |WopsV %  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pjC2jlwm*  
{ %idn7STJ}  
 BOOL bProcessed=FALSE; 1]yOC)u"i  
 if(HC_ACTION==nCode) E%eTjvvxus  
 { dQ6n[$Q@N  
  if((lParam&0xc0000000)==0xc0000000){// Key up m;=wQYFr{I  
   switch(wParam) SIJ:[=5!7  
   { IL:d`Kbqf  
    case VK_MENU: &GF|Rr8NXs  
     MaskBits&=~ALTBIT; bIFKP  
     break; l7 +#gPA  
    case VK_CONTROL: Di[}y;  
     MaskBits&=~CTRLBIT; ZZkxEq+D  
     break; bYuQ"K A$  
    case VK_SHIFT: 0_}^IiG  
     MaskBits&=~SHIFTBIT; j\^0BTZ  
     break; Oz\mIVC#  
    default: //judge the key and send message 2Xu?/yd  
     break; 6GxQ<  
   } y$n7'W6  
   for(int index=0;index<MAX_KEY;index++){ [m9Pt]j@  
    if(hCallWnd[index]==NULL) j@kL`Q\&I  
     continue; /`M> 3q[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hEO#uAR^Z  
    { ZS&n,<a5L}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -=W"  
     bProcessed=TRUE; hK!Z ~  
    } :$bp4+3>  
   } | HkLl^  
  } f8ap+][  
  else if((lParam&0xc000ffff)==1){ //Key down 2?",2x09  
   switch(wParam) "6T: &>  
   { 5ryzAB O\2  
    case VK_MENU: =j)y.x(  
     MaskBits|=ALTBIT; p*11aaIbp~  
     break; :ZP4(}  
    case VK_CONTROL: l!n<.tQW  
     MaskBits|=CTRLBIT; ]gN]Cw\L  
     break; Z_ Gb9  
    case VK_SHIFT: L{v^:  
     MaskBits|=SHIFTBIT; x.V6C0|6"  
     break; Cd4a7<-  
    default: //judge the key and send message T Y|5O! <  
     break; fI{ZElPp  
   } u9WQ0.  
   for(int index=0;index<MAX_KEY;index++) nI1DLVt  
   { _3q%  
    if(hCallWnd[index]==NULL) 4$~]t:n  
     continue; RwH<JaL:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |{#=#3X  
    { T5mdC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .YvE  
     bProcessed=TRUE; -qki^!Y?  
    } |E\0Rv{H3  
   } }3tbqFiH  
  } CgLS2  
  if(!bProcessed){ N=qe*Rlf  
   for(int index=0;index<MAX_KEY;index++){ vYh_<Rp5  
    if(hCallWnd[index]==NULL) NF& ++Vr6  
     continue; dcFqK~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %5X}4k!p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); go, Hfb  
   } N4 O'{  
  } :!omog  
 } ,/.U'{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E,Q>jH  
} GCxtWFXH  
o<`)cb }  
BOOL InitHotkey() Sz\"*W;>  
{ @w1@|"6vF  
 if(hHook!=NULL){ | v? pS  
  nHookCount++; UWdPB2x[  
  return TRUE; @PXb^x#k  
 } L  lP  
 else "K EB0U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;().  
  if(hHook!=NULL) f%LzWXA  
   nHookCount++; FHNK%Ko  
  return (hHook!=NULL); Oeo:V"  
} H].G%,2'  
BOOL UnInit() Onr#p4UT  
{ Da)rzr|}>3  
 if(nHookCount>1){ Zk+J=Cwq}  
  nHookCount--; NO4V{}?a  
  return TRUE; xl%!7?G|$>  
 } s52c`+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); stnyJ9  
 if(unhooked==TRUE){ lO/<xSjNd  
  nHookCount=0; By=/DVm)=  
  hHook=NULL; qyP|`Pm4  
 } o E+s8Q  
 return unhooked; 2 }QD>  
} P)fv:a  
b\zRwp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >uN`q1?l'  
{ &a?&G'?  
 BOOL bAdded=FALSE; &"dT/5}6  
 for(int index=0;index<MAX_KEY;index++){ KKm0@Y   
  if(hCallWnd[index]==0){ %0]vW;Q5  
   hCallWnd[index]=hWnd; W)"PYC4  
   HotKey[index]=cKey; ^(ks^<}  
   HotKeyMask[index]=cMask; VjU;[  
   bAdded=TRUE; =RR225  
   KeyCount++; @l9qH1  
   break; 0NLoqq  
  } <BIj a  
 } Vp $]  
 return bAdded; *|n::9  
} }i1p &EN^  
[/#c9RA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t<O5_}R%d  
{ w=I' CMRt  
 BOOL bRemoved=FALSE; ;!4Bw"Gg  
 for(int index=0;index<MAX_KEY;index++){ p*10u@,  
  if(hCallWnd[index]==hWnd){ qC9$xIWq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^/ K\a ,  
    hCallWnd[index]=NULL; j(|G) F  
    HotKey[index]=0; T ,, Ao36  
    HotKeyMask[index]=0; DPvM|n`TW  
    bRemoved=TRUE; Bcx-t)[  
    KeyCount--; n{F$,a  
    break; D_GIj$%N[  
   } yD iL  
  } q<>  
 } W G2 E3y  
 return bRemoved; JZp*"UzQr  
} SWr?>dl  
\H$Ps9Xh  
void VerifyWindow() OL]^4m  
{ \F%5TRoC  
 for(int i=0;i<MAX_KEY;i++){ iw<#V&([ J  
  if(hCallWnd!=NULL){ @ViJJ\  
   if(!IsWindow(hCallWnd)){ \oF79   
    hCallWnd=NULL;  ^o+}3=  
    HotKey=0; @R= gJ:&a  
    HotKeyMask=0; hd~X c  
    KeyCount--; .s 31D%N  
   } CW k#Amt.  
  } CIh@H6|  
 } D%v4B`4ua'  
} ~LPxVYhK  
~ \tI9L?|A  
BOOL CHookApp::InitInstance() -;_`>OU{  
{ ` bd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <8 MKjf  
 hins=AfxGetInstanceHandle(); `r+"2.z*  
 InitHotkey(); 27*u^N*z@  
 return CWinApp::InitInstance(); PF@+~FI  
} vS-k0g;   
._m+@Uy]H}  
int CHookApp::ExitInstance() O=}4?Xv  
{ '~i} 2e.  
 VerifyWindow(); wZVY h  
 UnInit(); P0J3ci}^  
 return CWinApp::ExitInstance(); HlqvXt\  
} Ktg{-Xl  
I0 a,mO;m  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v8"plx=3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \P]w^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ev;HV}G  
#if _MSC_VER > 1000 }f)$+mi  
#pragma once ;cl\$TDL  
#endif // _MSC_VER > 1000 5Qhu5~,K  
 ZSq7>}  
class CCaptureDlg : public CDialog `_sc_Y|C!  
{ pN/)$6=  
 // Construction M}NmA  
 public: &~U!X~PpB  
  BOOL bTray; T^u][I3*  
  BOOL bRegistered; W R@=[G#TJ  
  BOOL RegisterHotkey(); h5WS<P  
  UCHAR cKey; zCKZv|j6  
  UCHAR cMask; {J q[N}  
  void DeleteIcon(); T;jp2 #  
  void AddIcon(); kM5N#|!  
  UINT nCount; \o9-[V#Gm  
  void SaveBmp(); hK"hMyH^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _f$8{&`k  
  // Dialog Data 5Jq~EB{"  
  //{{AFX_DATA(CCaptureDlg) i rMZLc6  
  enum { IDD = IDD_CAPTURE_DIALOG }; w#eD5y~'oo  
  CComboBox m_Key; Y 3r m')c  
  BOOL m_bControl; IlsXj`!e  
  BOOL m_bAlt; /2-S/,a  
  BOOL m_bShift; Zh`lC1l'  
  CString m_Path; ~\`lbGJ7?  
  CString m_Number; !s#25}9zX5  
  //}}AFX_DATA qd"1KzQWO  
  // ClassWizard generated virtual function overrides Ar4E $\W  
  //{{AFX_VIRTUAL(CCaptureDlg) 5R}Qp<D[^  
 public: -4`Wkkhu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); VO3&!uOd  
 protected: +9G GC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?F20\D\V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); aO('X3?  
  //}}AFX_VIRTUAL ZB GLwe  
  // Implementation V{;!vt~  
 protected: Xu`c_  
  HICON m_hIcon; Mit,X  
  // Generated message map functions V %'`nJ!  
  //{{AFX_MSG(CCaptureDlg) XVAy uuTg\  
  virtual BOOL OnInitDialog(); 4>nY't;0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E%OY7zf`%  
  afx_msg void OnPaint(); e>~g!S}G  
  afx_msg HCURSOR OnQueryDragIcon(); b{<qt})  
  virtual void OnCancel(); q}>1Rr|U`  
  afx_msg void OnAbout(); ?D-1xnxep  
  afx_msg void OnBrowse(); duB{ 1  
  afx_msg void OnChange(); *JE%bQ2Q  
 //}}AFX_MSG zF6 R\w  
 DECLARE_MESSAGE_MAP() 1o)@{x/pd  
}; ;hGC.}X  
#endif R;&C6S  
By{zX,6'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5G=<2;  
#include "stdafx.h" 8A}w}h  
#include "Capture.h" %eWzr  
#include "CaptureDlg.h" ia 1Sf3  
#include <windowsx.h> lY/{X]T.(  
#pragma comment(lib,"hook.lib") 0xrr9X<  
#ifdef _DEBUG fyPpzA0  
#define new DEBUG_NEW ^I03PIy0l  
#undef THIS_FILE 9Z]~c^UB  
static char THIS_FILE[] = __FILE__; o&P}GcEIw  
#endif $&/JY  
#define IDM_SHELL WM_USER+1 n/#zx:d?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3ny>5A!;2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }S51yDVG_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; tFt56/4  
class CAboutDlg : public CDialog t!Q uM_i3  
{ jY%&G#4  
 public: 6nh!g  
  CAboutDlg(); |niYN7 17  
  // Dialog Data B*7Y5_N  
  //{{AFX_DATA(CAboutDlg) xgHR;US H  
  enum { IDD = IDD_ABOUTBOX }; "MHm9D?5  
  //}}AFX_DATA ntbl0Sk  
  // ClassWizard generated virtual function overrides hc OT+L>  
  //{{AFX_VIRTUAL(CAboutDlg) L;zwqdI  
 protected: k8H@0p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {Vw+~8  
  //}}AFX_VIRTUAL  H"czF  
  // Implementation K}"xZy Tm1  
 protected: x8k7y:  
  //{{AFX_MSG(CAboutDlg) 's>   
  //}}AFX_MSG &5puGnTZ  
  DECLARE_MESSAGE_MAP() [P.M>"c\  
}; j#QJ5(#  
\MBbZB9@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2g5i3C.q$  
{ \J[m4tw^  
 //{{AFX_DATA_INIT(CAboutDlg) r/zuo6"5  
 //}}AFX_DATA_INIT 0JzH dz  
} Oxs O  
3/c3e{,!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 85CH% I#  
{ li'h&!|]  
 CDialog::DoDataExchange(pDX); c'cK+32  
 //{{AFX_DATA_MAP(CAboutDlg) -4ry)isYx  
 //}}AFX_DATA_MAP +v.uP [H  
} {<&i4;  
@_s`@ ,=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ie{98  
 //{{AFX_MSG_MAP(CAboutDlg) Qt`hUyL  
 // No message handlers #HFB* >  
 //}}AFX_MSG_MAP p=%Vo@*]  
END_MESSAGE_MAP() HS>(y2}'  
Py*( %  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) M)S(:Il6Xx  
: CDialog(CCaptureDlg::IDD, pParent) z~&uLu  
{ -^sW{s0Rc  
 //{{AFX_DATA_INIT(CCaptureDlg) `roos<F1D  
  m_bControl = FALSE; MU6|>{  
  m_bAlt = FALSE; X`i'U7%I  
  m_bShift = FALSE; vD<6BQR  
  m_Path = _T("c:\\"); iUSP+iC,  
  m_Number = _T("0 picture captured."); Zjis0a]v~k  
  nCount=0; (:9yeP1  
  bRegistered=FALSE; k(LZ,WSR  
  bTray=FALSE; HJ#3wk"W  
 //}}AFX_DATA_INIT ,/0Q($oz  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rR`'l=,t  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \kSoDY`l&  
} GL;@heP  
y/=:F=H@w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :})(@.H  
{ yg({g "  
 CDialog::DoDataExchange(pDX); m$<LO%<~p  
 //{{AFX_DATA_MAP(CCaptureDlg) .Zo%6[X  
  DDX_Control(pDX, IDC_KEY, m_Key); \:]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  x{K^u"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); hojP3 [  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]xGo[:k|E  
  DDX_Text(pDX, IDC_PATH, m_Path); 5ncjv@Aa  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l{b<rUh5W  
 //}}AFX_DATA_MAP s18o,Zs'  
} lGrp^  
fH#yJd2?f  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |;xm-AM4r  
//{{AFX_MSG_MAP(CCaptureDlg) A/5??3H  
 ON_WM_SYSCOMMAND() fM,!9}<  
 ON_WM_PAINT() e7e6b-"_2  
 ON_WM_QUERYDRAGICON() <Z{pjJ/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) k(hYNmmo j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) HIiMq'H^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #a1zk\R3  
//}}AFX_MSG_MAP LX<arHz  
END_MESSAGE_MAP() V~#e%&73FH  
W|@7I@@$"  
BOOL CCaptureDlg::OnInitDialog() <Jt H/oN  
{ Bmx+QO  
 CDialog::OnInitDialog(); w2*.3I,~)B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1{6BU!  
 ASSERT(IDM_ABOUTBOX < 0xF000); % 8c <C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V11(EZJ/j  
 if (pSysMenu != NULL) NUxOU>f  
 { OJ#eh w<  
  CString strAboutMenu; j,<3[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); W,sU5sjA  
  if (!strAboutMenu.IsEmpty()) D5]AL5=Xt2  
  { -64@}Ts*?  
   pSysMenu->AppendMenu(MF_SEPARATOR); w Vegr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0|6]ps4Z7  
  } ~K'e}<-G  
 } feJzX*u  
 SetIcon(m_hIcon, TRUE); // Set big icon 9Z?P/ o  
 SetIcon(m_hIcon, FALSE); // Set small icon M:t!g %  
 m_Key.SetCurSel(0); /#mq*kNIM6  
 RegisterHotkey(); .II*wK k  
 CMenu* pMenu=GetSystemMenu(FALSE); { 'A`ram  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'iQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &d,chb (  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b\6 )whh  
 return TRUE; // return TRUE unless you set the focus to a control .<xzf4C  
} &[u>^VO8  
So?.V4aD_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) IZ){xI  
{ 99QMMup  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) !LGnh  
 { ku2g FO  
  CAboutDlg dlgAbout; s |40v@ M  
  dlgAbout.DoModal(); |W't-}yf  
 } }iGpuoXT`  
 else g/*x;d=  
 { m(2(Caz{  
  CDialog::OnSysCommand(nID, lParam); 6d4e~F  
 }  Om%HrT  
} 9NUft8QB  
\R"}=7  
void CCaptureDlg::OnPaint() 'K|Jg.2  
{ k8>(-W"A  
 if (IsIconic()) }s*H| z  
 { VSm[80iR0  
  CPaintDC dc(this); // device context for painting l'yX_`*Iq  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :+ASZE.  
  // Center icon in client rectangle U2Uf69R  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7CKpt.Sz6  
  int cyIcon = GetSystemMetrics(SM_CYICON); cZ8lRVaWW  
  CRect rect; |\HYq`!g%7  
  GetClientRect(&rect); ~Te9Lq|  
  int x = (rect.Width() - cxIcon + 1) / 2; WUC-* (  
  int y = (rect.Height() - cyIcon + 1) / 2; 'eM90I%(  
  // Draw the icon t1LIZ5JY  
  dc.DrawIcon(x, y, m_hIcon); =1!,A  
 } \VL_  
 else M<Gr~RKmAn  
 { V)pn)no'V  
  CDialog::OnPaint(); #sHA!@ |  
 } m7~<z>5$  
} 0LX"<~3j  
|)%]MK$;  
HCURSOR CCaptureDlg::OnQueryDragIcon() /6?A#%hc  
{ ,s=jtK  
 return (HCURSOR) m_hIcon; gzHMZ/31  
} @M]uUL-ze  
$ 12mS  
void CCaptureDlg::OnCancel() ;Avz%2#c`  
{ B/:+(|  
 if(bTray) %_kXC~hH_  
  DeleteIcon(); j|6@>T1  
  CDialog::OnCancel(); 6}V)\"u&   
} X jJV  
tYe+7s  
void CCaptureDlg::OnAbout() Z`FEB0$  
{ [Ej#NHs  
 CAboutDlg dlg; fG *1A\t]  
 dlg.DoModal(); 7m4gGkX#r  
} 4yZ'+\ +I  
s!lLdR[g  
void CCaptureDlg::OnBrowse() 0r4,27w  
{ &1=Je$,  
 CString str; rL kUIG  
 BROWSEINFO bi; 9EPE.+ns  
 char name[MAX_PATH]; v jTs[eq>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "7]YvZYu0  
 bi.hwndOwner=GetSafeHwnd(); >DFpL$oP  
 bi.pszDisplayName=name; n;Nr[hI  
 bi.lpszTitle="Select folder"; *qX!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p"xti+2,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >e g8zN  
 if(idl==NULL) t)#d R._q  
  return; 9/8#e+L  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +*I'!)T^B  
 str.ReleaseBuffer(); uTWij4)a  
 m_Path=str; #!A'6SgbkM  
 if(str.GetAt(str.GetLength()-1)!='\\') qw#wZ'<n  
  m_Path+="\\"; <yoCW?#  
 UpdateData(FALSE); FW~{io]n  
} .Mn_T*F  
z~O#0Q !  
void CCaptureDlg::SaveBmp() v?s]up @@h  
{ >A]U.C  
 CDC dc; N5ph70#y3  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3SI~?&HU!/  
 CBitmap bm; +hUS sR&  
 int Width=GetSystemMetrics(SM_CXSCREEN); xSf&*wLE  
 int Height=GetSystemMetrics(SM_CYSCREEN); *btLd7c%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Q|gw\.]$&[  
 CDC tdc; X@["Jjp  
 tdc.CreateCompatibleDC(&dc); Z+gG.|"k  
 CBitmap*pOld=tdc.SelectObject(&bm); d`XC._%^J  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^R g=*L  
 tdc.SelectObject(pOld); @;6I94Bp  
 BITMAP btm; ?Aq \Gr  
 bm.GetBitmap(&btm); T%[&[8{8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; yLC5S3^1\"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &J]|pf3m  
 BITMAPINFOHEADER bih; 4 6yq F  
 bih.biBitCount=btm.bmBitsPixel; [Iwb7a0p  
 bih.biClrImportant=0; B4&K2;fg_  
 bih.biClrUsed=0; xr;:gz!h  
 bih.biCompression=0; ""Ub^:ucD  
 bih.biHeight=btm.bmHeight; 8C[W;&Y=  
 bih.biPlanes=1; &N+,{7.  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?k|}\l[X1  
 bih.biSizeImage=size; D2,2Yy5 y  
 bih.biWidth=btm.bmWidth; NcuZw?  
 bih.biXPelsPerMeter=0; #mK/xbW  
 bih.biYPelsPerMeter=0; :jKiHeBQu?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); F6L}n-p5  
 static int filecount=0; -T,/S^  
 CString name; Y%OJ3B(n|  
 name.Format("pict%04d.bmp",filecount++); (O[:-Aqm  
 name=m_Path+name; !ek};~(  
 BITMAPFILEHEADER bfh; %(P\"hE'  
 bfh.bfReserved1=bfh.bfReserved2=0; 6'F4p1VG*I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); eU*0;#  
 bfh.bfSize=54+size;  WR;)  
 bfh.bfOffBits=54; :2 Fy`PPab  
 CFile bf; V(?PKb-w)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?Z1&ju,Hd-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,m HQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &rc]3! B  
  bf.WriteHuge(lpData,size); #NvL@bH  
  bf.Close(); 3PBGIo  
  nCount++; rfz\DvV d  
 } Tc3~~X   
 GlobalFreePtr(lpData); nEG+TRZ)\  
 if(nCount==1) 0\y{/P?I$  
  m_Number.Format("%d picture captured.",nCount); fQ[& ^S$  
 else [|vE*&:uO  
  m_Number.Format("%d pictures captured.",nCount); y^iju(  
  UpdateData(FALSE); LH@xr\^  
} ~xp(k  
SU` RHAo  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $-=QTX  
{ K> rZJ[a  
 if(pMsg -> message == WM_KEYDOWN) P3W<a4 ==  
 { ^zfO=XN  
  if(pMsg -> wParam == VK_ESCAPE) l%f &vOcd  
   return TRUE; ].!^BYNht  
  if(pMsg -> wParam == VK_RETURN) eZck$]P(6H  
   return TRUE; |riP*b  
 } `R\nw)xq  
 return CDialog::PreTranslateMessage(pMsg); Miw*L;u@W  
} +L]$M)*0&  
e7$ZA#A_5v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6m\MYay  
{ 4/Mi-ls_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ IAl X^6s*  
  SaveBmp(); 1KI,/H"SY  
  return FALSE; ~{xm(p  
} MS=zG53y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p'fD:M:  
 CMenu pop; J% b`*?A  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #Bih=A #  
 CMenu*pMenu=pop.GetSubMenu(0); k$NNpv&;d  
 pMenu->SetDefaultItem(ID_EXITICON); 3= q,k<=L  
 CPoint pt; J8;lG  
 GetCursorPos(&pt); a*D])Lu[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); XMLJ X~  
 if(id==ID_EXITICON) \ y^Ho1Fj  
  DeleteIcon(); }JWLm.e  
 else if(id==ID_EXIT) k0/S&e,*  
  OnCancel(); \-h%z%{R  
 return FALSE; MT3TWWtZ:  
} Mx]![O.ye  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HtN!Hgpwg  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -aV!ZODt  
 AddIcon(); A><q-`bw  
 return res; l$\OSG  
} P{gGvC,  
Pw :{  
void CCaptureDlg::AddIcon() g,YJh(|#{  
{ T`7HQf ;  
 NOTIFYICONDATA data; oRALhaI  
 data.cbSize=sizeof(NOTIFYICONDATA); Z=|NoDZ  
 CString tip; rYP72<   
 tip.LoadString(IDS_ICONTIP); [2l2w[7Rid  
 data.hIcon=GetIcon(0); Osk'zFiL<  
 data.hWnd=GetSafeHwnd(); WxrG o o^  
 strcpy(data.szTip,tip); g2|qGfl{C  
 data.uCallbackMessage=IDM_SHELL; kgl7l?|O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; jI;iTKjB(  
 data.uID=98; Z+%w|Sx  
 Shell_NotifyIcon(NIM_ADD,&data); dln1JZ!  
 ShowWindow(SW_HIDE); :,f~cdq=  
 bTray=TRUE; ;dR4a@  
} ALO0yc  
})#SjFq<V  
void CCaptureDlg::DeleteIcon() iL6Yk @  
{ y+"6Y14  
 NOTIFYICONDATA data; *i)3q+%.  
 data.cbSize=sizeof(NOTIFYICONDATA); Af`qe+0E  
 data.hWnd=GetSafeHwnd(); 6`JY:~V"  
 data.uID=98; c2o.H!>  
 Shell_NotifyIcon(NIM_DELETE,&data); -yJ%G1R  
 ShowWindow(SW_SHOW); "N*bV  
 SetForegroundWindow(); dU"ca|u  
 ShowWindow(SW_SHOWNORMAL); iu$:_W_  
 bTray=FALSE; |ler\"Eu  
} !Y95e'f.x  
@L/p  
void CCaptureDlg::OnChange() e%wzcn  
{ {pR4+g  
 RegisterHotkey(); ~ 7^#.  
} xaw)iC[gI{  
|Vj@;+/j  
BOOL CCaptureDlg::RegisterHotkey() EG&97l b  
{ )/{zTg8$?/  
 UpdateData(); =U- w!uW  
 UCHAR mask=0; R?E< }\!  
 UCHAR key=0; Xk]:]pl4W  
 if(m_bControl) /]@1IC{Lk  
  mask|=4; a:V2(nY  
 if(m_bAlt) 2Vwv#NAV k  
  mask|=2; 1!P\x=Nn_  
 if(m_bShift) 7/>#yR  
  mask|=1; GX\6J]x=^2  
  key=Key_Table[m_Key.GetCurSel()]; 8rEUZk  
 if(bRegistered){ Mcfqo0T-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !C3ozZ<  
  bRegistered=FALSE; W-8U~*/  
 } ,jc')#]9B  
 cMask=mask; - fx?@  
 cKey=key; Gdu5 &]H#6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )a=58r07  
 return bRegistered; qZwqnH  
} t"Tv(W?_  
:g~X"C1s  
  四、小结 PZ[hH(EX  
'&+5L.  
  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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