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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: X+N5iT  
  o cW~I3  
  一、实现方法 452kE@=49  
||QK)$"  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 1L4-;HYJm  
`x/i1^/_@  
#pragma data_seg("shareddata") SA}Dkt&,  
HHOOK hHook =NULL; //钩子句柄 LX7P?j  
UINT nHookCount =0; //挂接的程序数目 G&^8)S@1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TS9<uRO0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 FsJk"$}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey L<@*6QH  
static int KeyCount =0; zgEN2d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 hZ*vk  
#pragma data_seg() <ytzGDx  
U'ctO%  
  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。 c.Sd~k:3  
,4t6Cq!  
  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: r/'!#7dLG-  
{:!>Y1w>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hQ<7k'V  
cKey,UCHAR cMask) wB0vpt5f  
{ /Q(boY{  
 BOOL bAdded=FALSE; j [lS.Lb  
 for(int index=0;index<MAX_KEY;index++){ 0l[52eZ/  
  if(hCallWnd[index]==0){ fm-m?=  
   hCallWnd[index]=hWnd; -#9et30  
   HotKey[index]=cKey; NT 5=%X]  
   HotKeyMask[index]=cMask; ;K\2/"$QD  
   bAdded=TRUE; F ><_gIT  
   KeyCount++; XN Uw  
   break; 7yyX8p>  
  } bpZA% {GS  
 } gjG SI'M0B  
 return bAdded; /Z:NoTGn  
} [%bGs1U  
//删除热键 E8r6P:5d`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r+C4<-dT  
{ wW*7  
 BOOL bRemoved=FALSE; 4RVqfD  
 for(int index=0;index<MAX_KEY;index++){ *4%pXm;  
  if(hCallWnd[index]==hWnd){ "JSIn"/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UU>+b:  
    hCallWnd[index]=NULL; <L4$f(2  
    HotKey[index]=0; ; &6 {c  
    HotKeyMask[index]=0; p =nbsS~":  
    bRemoved=TRUE; VBi gUK4  
    KeyCount--; <<?32r~  
    break; !hq*WtIk  
   } } uS0N$4  
  } C3W4:kbau  
 } (o B4*  
 return bRemoved; 1qNO$M  
} :<zIWje  
EB!ne)X  
<(>t"<  
  DLL中的钩子函数如下: kHhp;<  
=AzPAN#e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P05`DX}r,  
{ V5ZC2H  
 BOOL bProcessed=FALSE; M#o.O?.`  
 if(HC_ACTION==nCode) 7\%JJw6h  
 { Wj,s/Yr:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +U<YM94?  
   switch(wParam) C`_/aR6  
   {  lj}3TbM  
    case VK_MENU: M]6+s`?r  
     MaskBits&=~ALTBIT; Ph""[0n%o  
     break; Ed u(dZbKg  
    case VK_CONTROL: x@q.u3o9  
     MaskBits&=~CTRLBIT; %:`v.AG  
     break; $]_SPu  
    case VK_SHIFT: 'u v=D  
     MaskBits&=~SHIFTBIT; ?&wrz  
     break; YRV h[Bqg`  
    default: //judge the key and send message (4 ZeyG@  
     break; %dPk,Ylz  
   } }_KzF~  
   for(int index=0;index<MAX_KEY;index++){ 5n2!Y\  
    if(hCallWnd[index]==NULL) ?SgFD4<~P  
     continue; )  M0(vog  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G?$o+Y'F  
    { Z(|$[GZP[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hQx*#:ns  
     bProcessed=TRUE; QD!NV*  
    } +Xw%X3o)  
   } &2u |7U.  
  }  Rw0|q  
  else if((lParam&0xc000ffff)==1){ //有键按下 \0 h>!u  
   switch(wParam) -&7? !<f  
   { %OgK{h  
    case VK_MENU: u=InE|SH  
     MaskBits|=ALTBIT; %HpPTjAW  
     break; G 0pq'7B  
    case VK_CONTROL: cy,6^d  
     MaskBits|=CTRLBIT; L@T/4e./  
     break; {2:baoG-  
    case VK_SHIFT: z{OL+-OY  
     MaskBits|=SHIFTBIT; ?P[:,0_  
     break;  DlCN  
    default: //judge the key and send message Vc9Bg2f5  
     break; X8Z) W?vu  
   } ,H6P%  
   for(int index=0;index<MAX_KEY;index++){ GEy7Vb)  
    if(hCallWnd[index]==NULL) Q +l{> sL  
     continue; ! N2uJ?t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xSN;vrLHR  
    { =I'iD0eR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [VXQ&  
     bProcessed=TRUE; }Y!V3s1bm  
    } ,X_3#!y  
   } BTr oe=R  
  } TU_'1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2i6=g<   
   for(int index=0;index<MAX_KEY;index++){ `m(ZX\W]  
    if(hCallWnd[index]==NULL) gnN>Rl 5_  
     continue; '{cND  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ek5j;%~g1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I_f%%N%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ynf "g#(  
   } y]{b4e  
  } 31^/9lb  
 } .a2R2~35  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3"Oipt+  
} > )Qq^?U  
yj_/:eX  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: zZ-/S~l  
^3sv2wh^|8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t9<BQg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m %+'St|qr  
][Tw^r&  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: V$DB4YM1k  
lW-G]V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rV"3oM]Lo  
{ Nz{qu}dt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $Xo_8SX,  
 { 5D/Td#T04  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #"A`:bjG  
  SaveBmp(); zhow\l2t}  
  return FALSE; $H@   
 } .&]3wB~  
 …… //其它处理及默认处理 >N! Xey  
} B7C<;`5TiD  
?8grK  
^0_>  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 \l0!si  
D3g5#.$,}>  
  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。 h;E.y   
,>(X}Q  
  二、编程步骤 0*P-/)o x  
-|#/KKF  
  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"; #%GBopv  
4avkyFj!h  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uHf1b?W  
+{6:]  
  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; r!{i2I|  
:k_)Bh?+  
  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; oVUsI,8  
?zsRs?rc0  
  5、 添加代码,编译运行程序。 [xfg6  
_,F\%}  
三、程序代码 uUBUUr  
-=:tlH n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ={h^X0<s9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0ZL>-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7]5+%[Dg!  
#if _MSC_VER > 1000 `K$;K8!1  
#pragma once b+AxTe("  
#endif // _MSC_VER > 1000 g~|x^d^;|  
#ifndef __AFXWIN_H__ iH>JR[A  
#error include 'stdafx.h' before including this file for PCH (Ww SisC~  
#endif M?gZKdj  
#include "resource.h" // main symbols 3M^`6W[;  
class CHookApp : public CWinApp mT j  
{ {9@E[bWp#  
 public: \ X6y".|-  
  CHookApp(); (Ze\<Y#cv  
  // Overrides X2~KNw  
  // ClassWizard generated virtual function overrides ][OkydE  
  //{{AFX_VIRTUAL(CHookApp) v+C D{Tc  
 public: h_Er$ZT64  
  virtual BOOL InitInstance(); E>QEI;  
  virtual int ExitInstance(); I2z7}*<u  
  //}}AFX_VIRTUAL Vhm^<I-d  
  //{{AFX_MSG(CHookApp) &7,/^ >">  
  // NOTE - the ClassWizard will add and remove member functions here. N'5DB[:c:  
  // DO NOT EDIT what you see in these blocks of generated code ! "1P2`Ep;  
  //}}AFX_MSG D* HK[_5  
  DECLARE_MESSAGE_MAP()  >qI:  
}; [ifQLsHA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); phwq#AxQ   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LXe'{W+bk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ri9n.-xs  
BOOL InitHotkey(); aO<H!hK  
BOOL UnInit(); e [F33%  
#endif ryd}-_LL  
=Y3d~~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Y(R],9h8  
#include "stdafx.h" _B]Bd@<w  
#include "hook.h" % e70*;  
#include <windowsx.h> 4x/u$Ixzh=  
#ifdef _DEBUG +hWeN&A  
#define new DEBUG_NEW i)ibDrX!I  
#undef THIS_FILE .e:+Ek+  
static char THIS_FILE[] = __FILE__; 1@<>GDB9  
#endif .B$3y#TOb  
#define MAX_KEY 100 6>EoU-YX}l  
#define CTRLBIT 0x04 LGCeYXic  
#define ALTBIT 0x02 Lr>4~1:`  
#define SHIFTBIT 0x01 jm |zn  
#pragma data_seg("shareddata") )T^aJ-Uf  
HHOOK hHook =NULL; ~-(X\:z}  
UINT nHookCount =0; afcyAzIB&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JAL"On#c#0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT JnH5v(/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 495(V(+5  
static int KeyCount =0; T~N877  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift l}Vg;"1'J  
#pragma data_seg() 'V Y\ut  
HINSTANCE hins; Qc:Sf46O  
void VerifyWindow(); |1 LKdP  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) yj`xOncE}  
//{{AFX_MSG_MAP(CHookApp) R2[ }  
// NOTE - the ClassWizard will add and remove mapping macros here. "  6  
// DO NOT EDIT what you see in these blocks of generated code! jM(!!A jpC  
//}}AFX_MSG_MAP xJ|Z]m=d   
END_MESSAGE_MAP() 4b$m\hoN  
*WXqN!:  
CHookApp::CHookApp() :&D$Q 4  
{ Jc9^Hyqu&  
 // TODO: add construction code here, 3nkO+ qQ  
 // Place all significant initialization in InitInstance CQ%yki  
} ["?WVXCF8|  
rxIYgh  
CHookApp theApp; M7IQJFra  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `?Xt ,  
{ :!gzx n  
 BOOL bProcessed=FALSE; cE]#23  
 if(HC_ACTION==nCode) ~;Xkt G:  
 { ;%aWA  
  if((lParam&0xc0000000)==0xc0000000){// Key up Fqp~1>wi  
   switch(wParam) GUK3`}!%  
   { WN?meZ/N/  
    case VK_MENU: gIXc-=Ut  
     MaskBits&=~ALTBIT; _N`pwxpsb  
     break; Y~bGgd]T  
    case VK_CONTROL: q\5C-f  
     MaskBits&=~CTRLBIT; 1]XIF?_D m  
     break; x@>^c:-f  
    case VK_SHIFT: U^X8{,8O  
     MaskBits&=~SHIFTBIT; ud.Bzg:/  
     break; ? &;d)TQ  
    default: //judge the key and send message OKq={l  
     break; _.Bite^  
   } ,s1n! @9  
   for(int index=0;index<MAX_KEY;index++){ 0H{0aQQ  
    if(hCallWnd[index]==NULL) ?|9$o/Q}  
     continue; 9^c"HyR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }UWRH.;v  
    { Jid:$T>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); k||DcwO  
     bProcessed=TRUE; rJm%qSZz  
    } =<[ZFO~v  
   } NeyGIEP  
  } FR@ dBcJUU  
  else if((lParam&0xc000ffff)==1){ //Key down $T0|zPK5  
   switch(wParam) !kfnqe?|  
   { bqg\V8h  
    case VK_MENU: d|sI>6jD  
     MaskBits|=ALTBIT; a[8_ O-   
     break; -Q8pWtt  
    case VK_CONTROL: , 0rC_)&B  
     MaskBits|=CTRLBIT; 6l$o^R^D  
     break; m,TqyP#  
    case VK_SHIFT: yx}Z:t  
     MaskBits|=SHIFTBIT; ~ +$l9~`{  
     break; kB]|4CG{  
    default: //judge the key and send message 7_/.a9$G  
     break; ;SVF"Uo  
   } tIC_/ 6  
   for(int index=0;index<MAX_KEY;index++) z[ ;{p.W  
   { ;@ d<*  
    if(hCallWnd[index]==NULL) Urx gKTry  
     continue; Ck.GN<#-^P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X6<HNLgra  
    { GW{Nc !)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CsR~qQ 5  
     bProcessed=TRUE; m x,X!}  
    } 9AL\6 @<a*  
   } Krq^|DY  
  } j`'=K_+nU  
  if(!bProcessed){ nw5#/5xw  
   for(int index=0;index<MAX_KEY;index++){ a4: PufS  
    if(hCallWnd[index]==NULL) Vq'&t<K#  
     continue; tXK hkt`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \^-3)*r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I( y Wct  
   } 6U+#ADo  
  } y~S[0]y>  
 } G:e}>'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I@L-%#@R1  
} Y9w= [[1  
H_8@J  
BOOL InitHotkey() PUYo >eB)0  
{ BS|-E6E<  
 if(hHook!=NULL){ |_=jXf\TL  
  nHookCount++; ci^-0l_O  
  return TRUE; Z*ZG5e  
 } uN\9c Q  
 else G+g`=7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t=e0z^2i+  
  if(hHook!=NULL) .D>lv_kp  
   nHookCount++; M K[spV  
  return (hHook!=NULL); Dk"M8_-_  
} &'](T9kg=  
BOOL UnInit() 2\5@_U^)h  
{ g<dCUIbcQ  
 if(nHookCount>1){ Ph%s.YAZ~  
  nHookCount--; OVh/t# On  
  return TRUE; ~fUSmc  
 } Vut.oB$ ~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); =91'.c<  
 if(unhooked==TRUE){ /1>  
  nHookCount=0; jN<]yhqf  
  hHook=NULL; Em]T.'y  
 } 8|tm`r`*Az  
 return unhooked; }-Ma ~/  
} RtW5U8  
uHIWbF<0oo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O``MUb b  
{ ^ /BE=$E\  
 BOOL bAdded=FALSE; i|O7nB@  
 for(int index=0;index<MAX_KEY;index++){ dB,#`tc=,  
  if(hCallWnd[index]==0){ [uY 2N h  
   hCallWnd[index]=hWnd; ).boe& .  
   HotKey[index]=cKey; ;VH]TKkk  
   HotKeyMask[index]=cMask; k:qou})#4  
   bAdded=TRUE; ,TtDCcjd%f  
   KeyCount++; :58'U|  
   break; S p )}  
  } ri;M7rg`.{  
 } BT1'@qF  
 return bAdded; -U $pW(~  
} 4a|Fx  
wEbs E<</  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T ?? aVe]c  
{ 16Y~5JAc  
 BOOL bRemoved=FALSE; Z4-dF;7  
 for(int index=0;index<MAX_KEY;index++){ >PVi 3S  
  if(hCallWnd[index]==hWnd){ %Tb|Yfyr C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -}sya1(<8  
    hCallWnd[index]=NULL; 8'[wa  
    HotKey[index]=0; xwxjj  
    HotKeyMask[index]=0; Rx"Qwi,\U  
    bRemoved=TRUE; p4EItRZS  
    KeyCount--; sZB6zTX J  
    break; ko>_@]Jb  
   } x=#5\t9  
  } Lx{N%;t*E  
 } IpXhb[UZ?  
 return bRemoved; r3_gPK  
} rM=A"  
!q\w"p0X  
void VerifyWindow() P/9J!.Cm  
{ ZcRm5Du~:  
 for(int i=0;i<MAX_KEY;i++){ #/dde9y  
  if(hCallWnd!=NULL){ P$>kBW53  
   if(!IsWindow(hCallWnd)){ 9p rsL#Fn  
    hCallWnd=NULL; Q3q.*(#  
    HotKey=0; `>EvT7u  
    HotKeyMask=0; 2rtP.*dd  
    KeyCount--; s)8M? |[`I  
   } p-r%MnT  
  } <^_Vl8%  
 } LC\:xia{X  
} f}Tr$r  
z\8yB`8b^  
BOOL CHookApp::InitInstance() F'$S!K58  
{ cu`J2vm3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sg"D;b:X  
 hins=AfxGetInstanceHandle(); .^IhH|U  
 InitHotkey(); GR[>mkW!M  
 return CWinApp::InitInstance(); hYXZ21(K#  
} ?EQ^n3U$  
e=z_+gVm  
int CHookApp::ExitInstance() akW3\(W}  
{ Z;~[@7`  
 VerifyWindow(); [H%?jTQ  
 UnInit(); k)K-mD``U  
 return CWinApp::ExitInstance(); 5 t`ap  
} Gb|}Su  
N[<`6dpE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file niHL/\7u  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _d| 62VS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ CCh8?sM  
#if _MSC_VER > 1000 53t- 'K0l  
#pragma once 7 Y>`-\  
#endif // _MSC_VER > 1000 2ZG1n#  
7 Jx-W|  
class CCaptureDlg : public CDialog 42>m,fb2[  
{ _`Q It>R  
 // Construction  AMD?LjY~  
 public: R=?po=  
  BOOL bTray; ]AA%J@  
  BOOL bRegistered; VHT@s7u0"  
  BOOL RegisterHotkey(); yLz,V}  
  UCHAR cKey; H[7cA9FI  
  UCHAR cMask; L=HVdeE  
  void DeleteIcon(); >U~|R=*  
  void AddIcon(); 0)oN[  
  UINT nCount; C. Ja;RFq  
  void SaveBmp(); J/x@$'  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor x 1BOW  
  // Dialog Data GX@W"y  
  //{{AFX_DATA(CCaptureDlg) 9S1Ti6A  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?YO =J  
  CComboBox m_Key; %]<RRH.w  
  BOOL m_bControl; .^LL9{?  
  BOOL m_bAlt; q^N0abzgP  
  BOOL m_bShift; ;sChxQ=.^  
  CString m_Path; SCurO9RN  
  CString m_Number; PNJe&q0*  
  //}}AFX_DATA f>8B'%]  
  // ClassWizard generated virtual function overrides !rXcGj(k  
  //{{AFX_VIRTUAL(CCaptureDlg) O*rmD<L$  
 public: ^b"bRQqm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); MxgLzt Y  
 protected: N2tkCkl^x9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [X }@Ct6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G;Wkm|  
  //}}AFX_VIRTUAL $Pd|6  
  // Implementation 9si}WqAw  
 protected: fQQsb 5=i  
  HICON m_hIcon; p/hvQy E  
  // Generated message map functions kG$E tE#  
  //{{AFX_MSG(CCaptureDlg) SH vaV[C  
  virtual BOOL OnInitDialog(); B`*f(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zkh hN"bX  
  afx_msg void OnPaint(); -SvTg{Q{la  
  afx_msg HCURSOR OnQueryDragIcon(); ut$,?k!M  
  virtual void OnCancel(); M ?Ndy*]  
  afx_msg void OnAbout(); +5HnZ?E\  
  afx_msg void OnBrowse(); PUP"ky^q"  
  afx_msg void OnChange(); $Ns,ts(ng  
 //}}AFX_MSG NfTCp A  
 DECLARE_MESSAGE_MAP() j2 }  
}; FjZc#\^9  
#endif 2e9jo,i  
=`Po<7D  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V uG?B{  
#include "stdafx.h" s.yq}Q  
#include "Capture.h" 1~2R^#rm  
#include "CaptureDlg.h" 7v_i>_m]  
#include <windowsx.h> 22`oFXb'  
#pragma comment(lib,"hook.lib") wjTNO0hj  
#ifdef _DEBUG C$<"w,  
#define new DEBUG_NEW u5w&X8x  
#undef THIS_FILE #bT8QbJ(  
static char THIS_FILE[] = __FILE__; 9u,8q:I.?  
#endif ~x|aoozL  
#define IDM_SHELL WM_USER+1 S&4+ e:K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /O|:{LQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y?yo\(Cdx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .u1X+P7  
class CAboutDlg : public CDialog l|YT[LR7  
{ 5@P%iBA4(3  
 public: `)R?nV b   
  CAboutDlg(); Hm%g_Mt  
  // Dialog Data qib 7Z]j  
  //{{AFX_DATA(CAboutDlg) 4YszVT-MU~  
  enum { IDD = IDD_ABOUTBOX }; 0YzsA#yv  
  //}}AFX_DATA ' .B.V?7  
  // ClassWizard generated virtual function overrides _!n}P5  
  //{{AFX_VIRTUAL(CAboutDlg) bGv* -;*  
 protected: LA-_3UJx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qmZ2d!)o  
  //}}AFX_VIRTUAL 3VmI0gsm.>  
  // Implementation *5'.!g('  
 protected: `Da+75 f6v  
  //{{AFX_MSG(CAboutDlg) nV}8M  
  //}}AFX_MSG Lf. 1>s  
  DECLARE_MESSAGE_MAP() N{8"s&  
}; ;7Y[c}V1^  
[C1 LT2a  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) k#O,j pbB  
{ c-kA^z{f  
 //{{AFX_DATA_INIT(CAboutDlg) dpwD8Q< U  
 //}}AFX_DATA_INIT bd!U)b(}OV  
} z}ElpT[(;  
.NJ|p=fy  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V<8K@/n@  
{ !}y1CA  
 CDialog::DoDataExchange(pDX); {Oj7  
 //{{AFX_DATA_MAP(CAboutDlg) G"T\=cQz  
 //}}AFX_DATA_MAP kneuV8+(5  
} o#>a 5  
0VN7/=n|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) GIT #<+"  
 //{{AFX_MSG_MAP(CAboutDlg) %r%So_^  
 // No message handlers V1B(|P  
 //}}AFX_MSG_MAP u%u&F^y  
END_MESSAGE_MAP() 6<X%\[)n  
FJeiY#us  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) lCJ6Ur;  
: CDialog(CCaptureDlg::IDD, pParent) ?]#OM_,8  
{ mdW~~-@H  
 //{{AFX_DATA_INIT(CCaptureDlg) k$N0lR4:p  
  m_bControl = FALSE; ~`qEWvPn  
  m_bAlt = FALSE; 5.vG^T0w  
  m_bShift = FALSE; e_.Gw"/Yl  
  m_Path = _T("c:\\"); 5G[x}4U  
  m_Number = _T("0 picture captured."); }4&/VvN  
  nCount=0; "Y;}G lE  
  bRegistered=FALSE; R_ ZK0ar  
  bTray=FALSE; , sjh^-;  
 //}}AFX_DATA_INIT 6cz/n8Mg  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 B4h5[fPX  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B(_WZa!  
} *nC(-(r:J`  
}^xE|~p  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 29&bbfU  
{ GIyF81KR 3  
 CDialog::DoDataExchange(pDX); 7B7&9<gc  
 //{{AFX_DATA_MAP(CCaptureDlg) 3BG>Y(v  
  DDX_Control(pDX, IDC_KEY, m_Key); u 8^{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o]ePP,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )Ry<a$Q3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); B07v^!Z>  
  DDX_Text(pDX, IDC_PATH, m_Path); E{E0Z9t7&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `d\r;cE%lm  
 //}}AFX_DATA_MAP =Yz'D|=t  
} V5i*O3a~   
%}-?bHB1c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) aNxAZMg  
//{{AFX_MSG_MAP(CCaptureDlg) cxIk<&i~(  
 ON_WM_SYSCOMMAND() :9|\Z|S(I  
 ON_WM_PAINT() mN |r)4{`  
 ON_WM_QUERYDRAGICON() :Dt~e|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gw36Ec<M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3^?ZG^V  
 ON_BN_CLICKED(ID_CHANGE, OnChange) t]aea*B  
//}}AFX_MSG_MAP ZfrVjUB  
END_MESSAGE_MAP() F@ Swe  
lf(`SYQnOY  
BOOL CCaptureDlg::OnInitDialog() 6eFp8bANN#  
{ Fqy\CMC  
 CDialog::OnInitDialog(); w[tmCn+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M_g ?<rK  
 ASSERT(IDM_ABOUTBOX < 0xF000); R :X0'zeRr  
 CMenu* pSysMenu = GetSystemMenu(FALSE); MN ^Aw9U  
 if (pSysMenu != NULL) 9h&R]yz;  
 { a 2 IgC25  
  CString strAboutMenu; -m *Sq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JN+_|`  
  if (!strAboutMenu.IsEmpty()) FMA6_fju4  
  { ^9Qy/Er'  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7lV.[&aKW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ApBWuXp|u  
  } U_x)#,4  
 } 2c6g>?  
 SetIcon(m_hIcon, TRUE); // Set big icon S*o[ZA   
 SetIcon(m_hIcon, FALSE); // Set small icon 7xRl9  
 m_Key.SetCurSel(0); *g?Po+ef%  
 RegisterHotkey(); L:XC  
 CMenu* pMenu=GetSystemMenu(FALSE); 7 d LuX   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Xs: 3'ua  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8NyJc"T<.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `]Q:-h  
 return TRUE; // return TRUE unless you set the focus to a control hn#1%p6t  
} [sB 9gY(  
VD_$$Gn*q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [!!Q,S"  
{ /|* Y2ETOr  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) QQWadVQo  
 { :oJ=iB'Zc  
  CAboutDlg dlgAbout; Z#rB}  
  dlgAbout.DoModal(); th;{V%:LW  
 } vZ.x{"n'~  
 else x)(|[  
 { 15o9 .   
  CDialog::OnSysCommand(nID, lParam);  }Y;K~J  
 } dKdj`wB  
} ~l)-wNqR4r  
4$P0:  
void CCaptureDlg::OnPaint() (1#J%  
{ EK4d_L]I  
 if (IsIconic()) :Nz9xD$S5  
 { \[y`'OD~  
  CPaintDC dc(this); // device context for painting N;\'N ne  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D8$G`~hD  
  // Center icon in client rectangle 6oGYnu;UZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3\XU_Xs(]  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2nR[Xh?L  
  CRect rect; EM[WK+9>I{  
  GetClientRect(&rect); u:=7l  
  int x = (rect.Width() - cxIcon + 1) / 2; ZjF 4v  
  int y = (rect.Height() - cyIcon + 1) / 2; #3gp6*R  
  // Draw the icon ME*LH r,  
  dc.DrawIcon(x, y, m_hIcon); "g1)f"pL  
 } h2XfC. f  
 else Eea*s'  
 { oM>Z;QVRC:  
  CDialog::OnPaint(); t+!$[K0/  
 } ?vbvBu{a  
} "$YJX1u3  
eS~LF.^Jw  
HCURSOR CCaptureDlg::OnQueryDragIcon() UWd=!h^dt  
{ ~5}* d  
 return (HCURSOR) m_hIcon; y ~U #veY  
} tM'P m   
kZmpu?P  
void CCaptureDlg::OnCancel() Xg;}R:g '  
{ .nx2";oi  
 if(bTray) A;]}m8(*  
  DeleteIcon(); nH[yJGZYSA  
  CDialog::OnCancel(); 62ws/8d6f  
} D=-SO +  
?fi,ifp*|l  
void CCaptureDlg::OnAbout() ;'#8tGv=  
{ wNpTM8rfU#  
 CAboutDlg dlg; T?ZRiR)@  
 dlg.DoModal(); ] Zy5%gI  
} hG12ZZD  
f'EuY17w  
void CCaptureDlg::OnBrowse() V{/?FO?E  
{ RC7]'4o  
 CString str; 3u*4o=4e  
 BROWSEINFO bi; Qp_isU  
 char name[MAX_PATH]; 'h|DO/X~L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3q\,$*D.  
 bi.hwndOwner=GetSafeHwnd(); o$jLzE"  
 bi.pszDisplayName=name; Y)*#)f  
 bi.lpszTitle="Select folder"; O;:mCt _H  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; JfLqtXF[&"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4%>$-($  
 if(idl==NULL) R;uvkg[o  
  return; S2sQOM@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jFL #s&ft  
 str.ReleaseBuffer(); 5YE'L.  
 m_Path=str; XDOY`N^L  
 if(str.GetAt(str.GetLength()-1)!='\\') ;- ~B)M_S`  
  m_Path+="\\"; xr4 *{v  
 UpdateData(FALSE); u8&Z!p\  
} ]%@M>?Ywc  
ZxGJzakB5$  
void CCaptureDlg::SaveBmp() CkOz  
{ 6-N?mSQU  
 CDC dc; snE8 K}4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); bnf'4PAt  
 CBitmap bm; N{9v1`B  
 int Width=GetSystemMetrics(SM_CXSCREEN); wh$sn:J  
 int Height=GetSystemMetrics(SM_CYSCREEN); #+ 0M2Sa  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h7G"G"  
 CDC tdc; #A1%gIw<v2  
 tdc.CreateCompatibleDC(&dc); e$<0 7Oc  
 CBitmap*pOld=tdc.SelectObject(&bm); :~"CuB/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k]F[>26k  
 tdc.SelectObject(pOld); t3 8m'J :>  
 BITMAP btm; N)uSG&S:  
 bm.GetBitmap(&btm); n{n52][J]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  eI$oLl@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8]M;T>n[  
 BITMAPINFOHEADER bih; 'N (:@]4N  
 bih.biBitCount=btm.bmBitsPixel; PxWT1 !  
 bih.biClrImportant=0; wN_Vfb  
 bih.biClrUsed=0; rK'L6o  
 bih.biCompression=0; Q 3hKk$Y  
 bih.biHeight=btm.bmHeight; XRM_x:+]  
 bih.biPlanes=1; c69C  
 bih.biSize=sizeof(BITMAPINFOHEADER); '.IW.{;$  
 bih.biSizeImage=size; `uv2H$  
 bih.biWidth=btm.bmWidth; (9''MlGd%  
 bih.biXPelsPerMeter=0; DU0zez I9  
 bih.biYPelsPerMeter=0; o |{5M|nD  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z3"%`*Tmq-  
 static int filecount=0; GFj{K  
 CString name; }"nItcp.1  
 name.Format("pict%04d.bmp",filecount++); hci6P>h<ia  
 name=m_Path+name; Qf~vZtJ+J  
 BITMAPFILEHEADER bfh; yr)G]K[/  
 bfh.bfReserved1=bfh.bfReserved2=0; 1-8mFIK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Y071Y:  
 bfh.bfSize=54+size; yZ0-wI  
 bfh.bfOffBits=54; a@_4PWzF:  
 CFile bf; ~qiJR`Jj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1!xQ=DU"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C)um9}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); NW~N}5T  
  bf.WriteHuge(lpData,size); i?p$H0b n  
  bf.Close(); m|SUV  
  nCount++; Z^bQ^zk-  
 } !a{^=#qq&I  
 GlobalFreePtr(lpData); m~iXl,r  
 if(nCount==1) pj\u9 L_  
  m_Number.Format("%d picture captured.",nCount); v> LIvi|]  
 else G?L HmTHg  
  m_Number.Format("%d pictures captured.",nCount); pR*VdC _mY  
  UpdateData(FALSE); O*hDbM2QQw  
} ak7bJ~)X=  
u4t7Ie*Q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rMdt:`  
{ F~,Mw8  
 if(pMsg -> message == WM_KEYDOWN) ]0Y4U7W  
 { \o z#l'z  
  if(pMsg -> wParam == VK_ESCAPE) \ ZgE  
   return TRUE; 8H%;WU9-  
  if(pMsg -> wParam == VK_RETURN) a!zz6/q[  
   return TRUE; Tr_w]'  
 } y*4=c _Z  
 return CDialog::PreTranslateMessage(pMsg); 0\X\izQ5  
} =mO vs  
%v=*Wb\3|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) W,K;6TZhh  
{ \Z?9{J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >@U*~Nz  
  SaveBmp(); qrb[-|ie&  
  return FALSE; TJ2=m 9Z  
} Lm iOhx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ q_MPju&*  
 CMenu pop; R4[N:~Z$|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G4Q[Th  
 CMenu*pMenu=pop.GetSubMenu(0); ^%d\qd`   
 pMenu->SetDefaultItem(ID_EXITICON); pd:WEI ,  
 CPoint pt; B al`y  
 GetCursorPos(&pt); 4.k0<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?qmRbDI  
 if(id==ID_EXITICON) <ykU6=  
  DeleteIcon(); NG=@ -eu  
 else if(id==ID_EXIT) zN[hkmh  
  OnCancel();  U'k*_g  
 return FALSE; D@,6M#SK  
} x!?u^  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1D7nkAy  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oTEL?hw5  
 AddIcon(); B~'vCuE  
 return res; l3{-z4mw  
} )\1@V+!E%  
B?OFe'*  
void CCaptureDlg::AddIcon() 5-FQMXgThc  
{ 8f_l}k$Eg  
 NOTIFYICONDATA data; 46}g7skD  
 data.cbSize=sizeof(NOTIFYICONDATA); h8x MI  
 CString tip; kGH}[w  
 tip.LoadString(IDS_ICONTIP); Wjo[ENHM  
 data.hIcon=GetIcon(0); u]g%@3Pn  
 data.hWnd=GetSafeHwnd(); a]$1D!Anc  
 strcpy(data.szTip,tip); `vU%*g&R  
 data.uCallbackMessage=IDM_SHELL; M  f}~{+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5^}\4.eXo  
 data.uID=98; /{EP*,/*  
 Shell_NotifyIcon(NIM_ADD,&data); NyaQI<5D  
 ShowWindow(SW_HIDE); t0( A4E  
 bTray=TRUE; MH =%-S   
} $r^GE  
GiJ *Wp  
void CCaptureDlg::DeleteIcon() C0sX gM  
{ b}2ED9HG\  
 NOTIFYICONDATA data; 55G+;  
 data.cbSize=sizeof(NOTIFYICONDATA); z$&{:\hj  
 data.hWnd=GetSafeHwnd(); ;/bewivNJ  
 data.uID=98; %gInje  
 Shell_NotifyIcon(NIM_DELETE,&data); q?H|o(  
 ShowWindow(SW_SHOW); :>rkG?NfL  
 SetForegroundWindow(); cA&9e<  
 ShowWindow(SW_SHOWNORMAL); 'g">LQ~a+  
 bTray=FALSE; rExnxQ<e  
} _H9 MwJ  
UI0( =>L  
void CCaptureDlg::OnChange() ,D5cjaX<  
{ FW;m\vu  
 RegisterHotkey(); AL[KpY  
} 4%{,] q\p  
N(O9&L*4fm  
BOOL CCaptureDlg::RegisterHotkey() 32(^Te]:  
{ '%>=ZhO  
 UpdateData(); #./fY;:cj  
 UCHAR mask=0; {Je[ZQ$  
 UCHAR key=0; l\f*d6o  
 if(m_bControl) <'}YyU=  
  mask|=4; !:)s"|=  
 if(m_bAlt) f<-Jg  
  mask|=2; <3L5"77G 6  
 if(m_bShift) We)xB  
  mask|=1; SbcS]H5Sk  
  key=Key_Table[m_Key.GetCurSel()]; .7^c@i[  
 if(bRegistered){  ''|W9!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )tG\vk=@  
  bRegistered=FALSE; u]:oZMnj  
 } LhN|1f:9:  
 cMask=mask; )z>|4@,  
 cKey=key; G3C~x.(f  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -6Z\qxKqZ  
 return bRegistered; p$O.> [  
} %]\kgRr  
6d:zb;Iz  
  四、小结 1v#%Ei$6`t  
`34zkPB??  
  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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