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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: lj/ ?P9  
  30-XFl  
  一、实现方法 $2A%y14  
rtS(iD@B"  
  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: DM/J,q  
Qf6]qJa|  
#pragma data_seg("shareddata") ,}2M'DSWa  
HHOOK hHook =NULL; //钩子句柄 x|<rt96 6A  
UINT nHookCount =0; //挂接的程序数目 /(8Usu?g.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tQ< ou,   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 T)6p,l  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BEPeK  
static int KeyCount =0; ,@tY D(Z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \m1r(*Ar  
#pragma data_seg() %a<N[H3NV@  
RWP`#(&/&  
  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。 3;Kv9i<~LE  
,)hUL/r6  
  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: kLU$8L  
XE[~! >'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )TnxsFC  
cKey,UCHAR cMask) F8$.K*tT  
{ mg[=~&J^  
 BOOL bAdded=FALSE; <_=a1x  
 for(int index=0;index<MAX_KEY;index++){ P#\L6EO.  
  if(hCallWnd[index]==0){ -^=gQ7f9  
   hCallWnd[index]=hWnd; ~b+4rYNxU_  
   HotKey[index]=cKey; }o0R`15dA  
   HotKeyMask[index]=cMask; i64a]=  
   bAdded=TRUE; "1$OPt5  
   KeyCount++; {(U?)4@  
   break; ~'m GGH2  
  } a)^f`s^aa  
 } B4bC6$Lg  
 return bAdded; *>h"}e41  
} U=\ZeYK.  
//删除热键 x[U/ 8#f&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G&)A7WaC  
{ H{ p   
 BOOL bRemoved=FALSE; &%+}bt5  
 for(int index=0;index<MAX_KEY;index++){ T~J6(,"  
  if(hCallWnd[index]==hWnd){ R(@B4M2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z@>hN%{d+g  
    hCallWnd[index]=NULL; wASgdGoy  
    HotKey[index]=0; kzny4v[y  
    HotKeyMask[index]=0; mw!D|  
    bRemoved=TRUE; $YSAD\a<  
    KeyCount--; )WF]v"t  
    break; e7T"?s  
   } cq>{  
  } qX^#fk7]  
 } N%v}$58Z  
 return bRemoved; mjO4GpG3  
} k"Y9Kc0XoU  
+[:"$?J  
zPEx;lO$  
  DLL中的钩子函数如下: jku_0Q0*?  
4G"T{A`O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oXRmnt  
{ -lV]((I&  
 BOOL bProcessed=FALSE; G7yCGT)vQ  
 if(HC_ACTION==nCode) lyNa(3  
 { Eo 5p-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f=]+\0MQ  
   switch(wParam) Gl}[1<~o  
   {  Ox7v*[x'  
    case VK_MENU: #|k;nFJ  
     MaskBits&=~ALTBIT; qL.1N~$2  
     break; VC5LxA0{  
    case VK_CONTROL: _p<W  
     MaskBits&=~CTRLBIT; FivgOa  
     break; 6d&dB  
    case VK_SHIFT: @GDe{GG+  
     MaskBits&=~SHIFTBIT; )8VrGg?  
     break; @]P#]%^D2  
    default: //judge the key and send message 3}e-qFlV8,  
     break; CG*eo!Nw  
   } DXu#07\  
   for(int index=0;index<MAX_KEY;index++){ {R%v4#nk  
    if(hCallWnd[index]==NULL) Kmc*z (Q  
     continue; uCO-f<b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <aR9,:  
    { smvIU0:K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Tj7OV}:  
     bProcessed=TRUE; 64 9{\;*4  
    } S+Z_Qf  
   } }tA77Cm)45  
  } 4scY 8(1  
  else if((lParam&0xc000ffff)==1){ //有键按下 MkgeECMf  
   switch(wParam) mz$)80ly  
   { /\34o{  
    case VK_MENU: EvSo|}JA[  
     MaskBits|=ALTBIT; t0h @i`  
     break; nI7G"f[%r;  
    case VK_CONTROL: Sm-gi|A  
     MaskBits|=CTRLBIT; #=C!Xx&  
     break; ^kJ(bBY  
    case VK_SHIFT: gEcRJ1Q;C  
     MaskBits|=SHIFTBIT; hEla8L4Y  
     break; q}P< Ejq}  
    default: //judge the key and send message 'X_8j` ]#  
     break; qPqpRi  
   } n6 D9f~8"  
   for(int index=0;index<MAX_KEY;index++){ {U@&hE -  
    if(hCallWnd[index]==NULL) cdiDfiE  
     continue; T n.Cj5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |s[kY  
    { dz@L}b*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1bjhEO W  
     bProcessed=TRUE; .<&o,D  
    } I/4:SNha  
   } NwPGH= V  
  } j#L"fW^GM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JrlDTNJj'  
   for(int index=0;index<MAX_KEY;index++){ 4M4Y2f BH  
    if(hCallWnd[index]==NULL) DP{kin"4I  
     continue; +g/TDwyVH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JL gk?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !SRElb A;i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mU0j K@^&M  
   } qQK0s*^W  
  } r9nH6 Md\  
 } ,dn6z#pb+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tgmG#b*  
} RW| LL@r  
z H$^.1  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ) H=}bqn  
/g$cQ=c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yF2|w=!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tg =ClZ-  
^w]N#%k\H  
  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: yKupPp);  
<ua`WRQr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @CGci lS=  
{ yQ$Q{,S9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X*f#S:kiNU  
 { C>l{_J)n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6&,n\EXF  
  SaveBmp(); me-Tv7WL  
  return FALSE; .Ukejx  
 } | e{F;8  
 …… //其它处理及默认处理  l Ozi|  
} zgre&BV0q  
@o4+MQFn  
n-ZOe]3  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 bu[PQsT  
Pnf|9?~$H  
  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。 udw>{3>  
G bW1Lq&"  
  二、编程步骤 t~_j+k0K#  
Y2lBQp8'|  
  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"; +,oEcCi  
wxC&KrRF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; n1 k2<BU4b  
K>%}m,  
  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; +5:Dy,F =  
4}0DEH.Vx  
  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; U|tUX)9O  
4#<r}j12z  
  5、 添加代码,编译运行程序。 hd+(M[C<9  
`N;}Gf-'  
三、程序代码 ^d6}rtG  
YY{0WWua  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL IQz"FH?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {jyI7 r#X  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]rwHr;.  
#if _MSC_VER > 1000 kH;DAphk  
#pragma once z"7I5N  
#endif // _MSC_VER > 1000 BhAWIH8@C  
#ifndef __AFXWIN_H__ ]oOSL=~c  
#error include 'stdafx.h' before including this file for PCH x? 10^~R  
#endif %63zQFk  
#include "resource.h" // main symbols g2?kC^=z=  
class CHookApp : public CWinApp #>O!N  
{ ^:krfXT  
 public: hA?Flq2QV  
  CHookApp(); `O5 Hzb(}  
  // Overrides p2m@0ou  
  // ClassWizard generated virtual function overrides 7TDt2:;]  
  //{{AFX_VIRTUAL(CHookApp) R'Gka1v  
 public: VkFvV><"  
  virtual BOOL InitInstance(); MTnW5W-r9  
  virtual int ExitInstance(); FYwMmb ~3  
  //}}AFX_VIRTUAL  Tt;h?  
  //{{AFX_MSG(CHookApp) FYOQ}N  
  // NOTE - the ClassWizard will add and remove member functions here. Bh` Y?S  
  // DO NOT EDIT what you see in these blocks of generated code ! F_ ^)zss  
  //}}AFX_MSG ?=u/&3Cw  
  DECLARE_MESSAGE_MAP() JAt$WW{  
}; nK!yu?mS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); e6G=Bq$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c#)!-5E~H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); , )&ansN  
BOOL InitHotkey(); /#<R  
BOOL UnInit(); sxG8 jD  
#endif 6[.#B!;9  
""~b1kEt  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~wejy3|@0  
#include "stdafx.h" 3/?^d;=  
#include "hook.h" )GT*HJR(vc  
#include <windowsx.h> qG lbO  
#ifdef _DEBUG .Iu8bN(L`  
#define new DEBUG_NEW 9\dpJ\  
#undef THIS_FILE R #f*QXv  
static char THIS_FILE[] = __FILE__; ]n\Qa   
#endif 9N+3S2sBx&  
#define MAX_KEY 100 =D>,s)}o3;  
#define CTRLBIT 0x04 H[WsHq;T+9  
#define ALTBIT 0x02 Uzi.CYVs%  
#define SHIFTBIT 0x01 `s )- lI  
#pragma data_seg("shareddata") |2L|Zp&  
HHOOK hHook =NULL; o"kVA;5<G  
UINT nHookCount =0; 96(3ilAt  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g36:OK"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cVV@MC  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %#_"I e  
static int KeyCount =0; Pv#Oea?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift (&Kv]--  
#pragma data_seg() m{v*\e7 P  
HINSTANCE hins; 5SB!)F]   
void VerifyWindow(); R^p'gQc$   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2uCw[iZM  
//{{AFX_MSG_MAP(CHookApp) mRurGaR  
// NOTE - the ClassWizard will add and remove mapping macros here. k4C3SI*`4  
// DO NOT EDIT what you see in these blocks of generated code! 'VMov  
//}}AFX_MSG_MAP dCb7sqJ%  
END_MESSAGE_MAP() *dAQ{E(rO  
*XU2%"Sc  
CHookApp::CHookApp() 3BZa}Q_  
{ u# TNW.  
 // TODO: add construction code here, '9ki~jtf=  
 // Place all significant initialization in InitInstance a<NZC  
} t6,bA1*5y  
74wDf  
CHookApp theApp; !&eKq?P{j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x]Pp|rHj  
{ xCQLfXK7  
 BOOL bProcessed=FALSE; bo-AM]  
 if(HC_ACTION==nCode) )K}-z+$)k  
 { Vsj1!}X:  
  if((lParam&0xc0000000)==0xc0000000){// Key up b)[2t^zG  
   switch(wParam) =#Z+WD-E  
   { w-j^jU><3  
    case VK_MENU: d:vuRK4+  
     MaskBits&=~ALTBIT; QM) ob  
     break; zk;'`@7  
    case VK_CONTROL: Nd h  
     MaskBits&=~CTRLBIT; X T<SR]  
     break; +:_;K_h  
    case VK_SHIFT: zl3GWj|?\7  
     MaskBits&=~SHIFTBIT; v;sWI"Fv!  
     break; Q$*JkwPQ}  
    default: //judge the key and send message "?M)2,:A  
     break; xxQgX~'x  
   } Y2TXWl,Jk  
   for(int index=0;index<MAX_KEY;index++){ wVmQE  
    if(hCallWnd[index]==NULL) 6QYHPz  
     continue; b{Bef*`/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pSl4^$2XR  
    { 98rO]rg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i*)BFV_-  
     bProcessed=TRUE; N[zR%(YS  
    } =&"a:l  
   } ]^0mh["  
  } 6n:oEXM>  
  else if((lParam&0xc000ffff)==1){ //Key down }F';"ybrU)  
   switch(wParam) =lmelo#m&  
   { {rzvZ0-j}  
    case VK_MENU: "H\R*\-0  
     MaskBits|=ALTBIT; B.4Or]  
     break; 98Y1-Z^ .  
    case VK_CONTROL: RDOV+2K  
     MaskBits|=CTRLBIT; oi7Y?hTj  
     break; LYke\/ md  
    case VK_SHIFT: +62}//_?  
     MaskBits|=SHIFTBIT;  (,R\6  
     break; A\})H  
    default: //judge the key and send message 7?ILmYBw  
     break; 0C4Os p  
   } AbL(F#{  
   for(int index=0;index<MAX_KEY;index++) }p>l,HD  
   { s[;1?+EI  
    if(hCallWnd[index]==NULL) "9IR|  
     continue; Rxq4Diq5k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gbu*6&j9  
    { q\/xx`L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AHzm9U @  
     bProcessed=TRUE; mYFc53B  
    } $wcTUl  
   } ;o?o92d  
  } ui80}%  
  if(!bProcessed){ p{x6BVw?>  
   for(int index=0;index<MAX_KEY;index++){ Gce[RB:  
    if(hCallWnd[index]==NULL) -XfGF<}r  
     continue; F8xu&Vk0:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e8&7W3 m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bQ-n<Lx  
   } `-g$ 0lm7  
  } XPLm`Q|1#t  
 } w>4( hGO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^ f[^.k$3d  
} y/>Nx7C0=2  
BKK@_B"  
BOOL InitHotkey() mGo NT  
{ I9h{fB  
 if(hHook!=NULL){ qOAhBZ~  
  nHookCount++; 7#j9"*  
  return TRUE; ,U~in)\ U  
 } %ed TW[C`  
 else L>pSE'}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); DAy|'%rF1-  
  if(hHook!=NULL) Y=@iD\u  
   nHookCount++; gZ us}U  
  return (hHook!=NULL); ir5eR}H  
} ]/|DCxQ  
BOOL UnInit() #!>`$  
{ 0x # V   
 if(nHookCount>1){ s >k4G  
  nHookCount--; ]} pAZd  
  return TRUE; v}<z_i5/C.  
 } p7L6~IN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rIX 40,`  
 if(unhooked==TRUE){ E O"  
  nHookCount=0; EcPvE=^c  
  hHook=NULL; q)PSHr=Z  
 } [OFT!=.y &  
 return unhooked; )>]SJQ!k  
} '.e 5Ku  
PPh1y;D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xy9'JVV6  
{ &VxK AQMxN  
 BOOL bAdded=FALSE; xEB 4oQ5  
 for(int index=0;index<MAX_KEY;index++){ @^`5;JiUk  
  if(hCallWnd[index]==0){ n&8N`!^o  
   hCallWnd[index]=hWnd; p+2uK|T9  
   HotKey[index]=cKey; w$749jGx  
   HotKeyMask[index]=cMask; 3ep L'My$  
   bAdded=TRUE; ktv{-WG2_  
   KeyCount++; mN#&NA  
   break; !)c0  
  } ^fM=|.?  
 } 'IER9%V$  
 return bAdded; ;8gODj:dO  
} !Tu.A@  
6uFGq)4p@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n4 Y ]v  
{ ,=P0rbtK  
 BOOL bRemoved=FALSE; ]j(Ld\:L  
 for(int index=0;index<MAX_KEY;index++){ [oH,FSuO!2  
  if(hCallWnd[index]==hWnd){ Bc#6mO-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gwYTOs ^  
    hCallWnd[index]=NULL; /zV0kW>N  
    HotKey[index]=0; z yI4E\  
    HotKeyMask[index]=0; =`%%*  
    bRemoved=TRUE; j0jam:.p  
    KeyCount--; !?)iP  
    break; o-t!z'\lO  
   } @yjui  
  } R7By=Y!t  
 } k?=V?JWY  
 return bRemoved; 7h/{F({r=  
} 9a_(_g>S  
0 .p $q  
void VerifyWindow() K#p&XIY,  
{ KBGJB`D*  
 for(int i=0;i<MAX_KEY;i++){ 8|,-P=%t  
  if(hCallWnd!=NULL){ h-h}NCP  
   if(!IsWindow(hCallWnd)){ v]27+/a$c  
    hCallWnd=NULL; L9U<E $%#  
    HotKey=0; +NEP*mk  
    HotKeyMask=0; ByZ.!~  
    KeyCount--; PZl(S}VY  
   } Dy^4^ J5+  
  } 9~mi[l~  
 } HI eMV,.QN  
} QX~*aqS3s8  
4/ U]7Y  
BOOL CHookApp::InitInstance() ikRIL2Y  
{ A1f]HT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); x{*!"a>  
 hins=AfxGetInstanceHandle(); ddHIP`wb  
 InitHotkey(); :7>Si%  
 return CWinApp::InitInstance(); r5iO%JFg  
} UmgLH Cz  
3]Lk}0atpL  
int CHookApp::ExitInstance() W\<#`0tUt  
{ '\*Rw]bR|  
 VerifyWindow(); = xX^  
 UnInit(); mQs'2Y6Oa  
 return CWinApp::ExitInstance(); OEwfNZQ-  
} g&E_|}u4  
M*S5&xpX  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file fp![Pbms.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) dju&Ku  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {M~!?# <K  
#if _MSC_VER > 1000 8:xQPd?3  
#pragma once o"1us75P  
#endif // _MSC_VER > 1000 }lb.3fqiA  
\+AH>I;vO  
class CCaptureDlg : public CDialog 5PL,~Y  
{ n ~3c<{coZ  
 // Construction t+(CAP|,  
 public: I3 x}F$^  
  BOOL bTray; %<muVRkB\  
  BOOL bRegistered; GyPN)!X@.&  
  BOOL RegisterHotkey(); >aWJ+  
  UCHAR cKey; ,6buo~?W:  
  UCHAR cMask; gq@."wHU  
  void DeleteIcon(); N8{>M,  
  void AddIcon(); _5Ll L#)  
  UINT nCount; F_Pd\Aq8  
  void SaveBmp(); t@HE.h  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor anwn!Eqk"  
  // Dialog Data 7z,M`14  
  //{{AFX_DATA(CCaptureDlg) hW+Dko(s  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1a!h&!$9  
  CComboBox m_Key; T+ t-0k  
  BOOL m_bControl; tQ}gBE63  
  BOOL m_bAlt; z*[Z:  
  BOOL m_bShift; j{Fo 6##  
  CString m_Path; 5Q}@Y3 i=  
  CString m_Number; 2$ rq  
  //}}AFX_DATA d?P aZz{4  
  // ClassWizard generated virtual function overrides 0Yjy  
  //{{AFX_VIRTUAL(CCaptureDlg) &4[iC/}  
 public: :ZIcWIV-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -?'CUm*Od  
 protected: "}EbA3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f\^QV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); E{ ,O}  
  //}}AFX_VIRTUAL an2Tc*=~l(  
  // Implementation Vi|jkyC8  
 protected: m#eD v*  
  HICON m_hIcon; }00e@a  
  // Generated message map functions a wK'XFk  
  //{{AFX_MSG(CCaptureDlg) [Bh]\I'  
  virtual BOOL OnInitDialog(); Ja&%J:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); NE4fQi?3  
  afx_msg void OnPaint(); W*m[t&;  
  afx_msg HCURSOR OnQueryDragIcon(); tVcs r  
  virtual void OnCancel(); mN*P 2 *  
  afx_msg void OnAbout(); X m3t xp#  
  afx_msg void OnBrowse(); mC7Y *  
  afx_msg void OnChange(); Wd}mC<rv1  
 //}}AFX_MSG )pLq^j  
 DECLARE_MESSAGE_MAP() >`uSNY"tO  
}; W Q&<QVK  
#endif $S}x'F!4_  
ZkJM?Fzq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \}=b/FL=U  
#include "stdafx.h" bsr y([N>w  
#include "Capture.h" XL3h ; $,  
#include "CaptureDlg.h" z&0V21"l  
#include <windowsx.h> f.$o|R=v  
#pragma comment(lib,"hook.lib") Em;b,x*U  
#ifdef _DEBUG [s2V-'2  
#define new DEBUG_NEW 4Dia#1$:J  
#undef THIS_FILE }BrE|'.j'  
static char THIS_FILE[] = __FILE__; gNd J=r4  
#endif YeLOd  
#define IDM_SHELL WM_USER+1 Sv@p!-m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h'x~"k1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v1=X=H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; bZXNo  
class CAboutDlg : public CDialog /<$"c"UQ  
{ d"UW38K{  
 public: ,Tl5@RN  
  CAboutDlg(); .[fz x`  
  // Dialog Data %}!}2s.A  
  //{{AFX_DATA(CAboutDlg) n4 @a`lN5g  
  enum { IDD = IDD_ABOUTBOX }; (<Xdj^v  
  //}}AFX_DATA C(|5,P#5  
  // ClassWizard generated virtual function overrides +_dYfux  
  //{{AFX_VIRTUAL(CAboutDlg) \xxVDr.  
 protected: i 8Xz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '[8b0\  
  //}}AFX_VIRTUAL :gq@/COo(  
  // Implementation yp^*TD/J  
 protected: `W n5 .V  
  //{{AFX_MSG(CAboutDlg) BfT,  
  //}}AFX_MSG 8 8$ Y-g5*  
  DECLARE_MESSAGE_MAP() d 6EY'*0  
}; Dj+Osh  
&>l8SlC?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ef;L|b%pp  
{ N{t :%[  
 //{{AFX_DATA_INIT(CAboutDlg) N08n/u&cr,  
 //}}AFX_DATA_INIT P{!:pxu[  
} *h:EE6|  
EiN)TB^]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) F^z8+W  
{ >}{-!  
 CDialog::DoDataExchange(pDX); Q; /F0JDH  
 //{{AFX_DATA_MAP(CAboutDlg) Ch9!AUiR  
 //}}AFX_DATA_MAP O + & xb  
} !(K{*7|h  
b6vYM_ Q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -0 da"AB  
 //{{AFX_MSG_MAP(CAboutDlg) oB R(7U ~0  
 // No message handlers  MK"  
 //}}AFX_MSG_MAP \_AEuz3 F  
END_MESSAGE_MAP() &AcFa<U  
#L:P R>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "q^'5p]  
: CDialog(CCaptureDlg::IDD, pParent) &vX!7 Y  
{ [=6~"!P}  
 //{{AFX_DATA_INIT(CCaptureDlg) y32++b!  
  m_bControl = FALSE; MW~B[%/  
  m_bAlt = FALSE; 9[{>JRm.  
  m_bShift = FALSE; `L#?eQ{  
  m_Path = _T("c:\\"); 2^#UO=ct  
  m_Number = _T("0 picture captured."); l\;mP.!  
  nCount=0; Jx$#GUl#j  
  bRegistered=FALSE; |QOJ9~hxD  
  bTray=FALSE; E 'JC  
 //}}AFX_DATA_INIT qmeml_(W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (TNY2Ke2 8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7b,,%rUd  
} J%:/<uCmZ  
4)+IO;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %Rep6=K*$  
{ p <=%  
 CDialog::DoDataExchange(pDX); +c8AbEewg  
 //{{AFX_DATA_MAP(CCaptureDlg) 0nn]]B@l  
  DDX_Control(pDX, IDC_KEY, m_Key); yCCw<?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); TUUE(sLA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .q`H`(QM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r`R~{;oT  
  DDX_Text(pDX, IDC_PATH, m_Path); 2HGD{;6>v{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); p;=kH{uu  
 //}}AFX_DATA_MAP ),Ho(%T\  
} PT#eXS9_  
$l,Zd6<1q  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) CQzjCRS d  
//{{AFX_MSG_MAP(CCaptureDlg) Wt9iL  
 ON_WM_SYSCOMMAND() xGEmrE<;  
 ON_WM_PAINT() :~3{oZGX&  
 ON_WM_QUERYDRAGICON() )d(0Y<e @  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) kq%gY  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P%@rH@^Y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :{b6M/  
//}}AFX_MSG_MAP R mW fV  
END_MESSAGE_MAP() A!W" *WT  
fb"J Bc}X  
BOOL CCaptureDlg::OnInitDialog() 6~F#F)C'  
{ c Z6p^  
 CDialog::OnInitDialog(); |\%F(d330  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3> \fP#oQ  
 ASSERT(IDM_ABOUTBOX < 0xF000); c@9Z&2)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]LBvYjMY  
 if (pSysMenu != NULL) AX!>l;  
 { 0^}'+t,lc  
  CString strAboutMenu; dmaqXsU8q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z/0yO@_D/q  
  if (!strAboutMenu.IsEmpty()) A?Nn>xF9X  
  { WiNr866nB  
   pSysMenu->AppendMenu(MF_SEPARATOR); J[!x%8m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i6F:C &.  
  } 1rv$?=Z  
 } ,.oa,sku  
 SetIcon(m_hIcon, TRUE); // Set big icon a#Kmj 0  
 SetIcon(m_hIcon, FALSE); // Set small icon S@c\|  
 m_Key.SetCurSel(0); x'2 ,sE  
 RegisterHotkey(); q)?p$\  
 CMenu* pMenu=GetSystemMenu(FALSE); O+o;aa6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4aN+}TkH@G  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P#[IUXtT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4Hml.|$  
 return TRUE; // return TRUE unless you set the focus to a control 'G l;Ir^  
} 0Q$~k  
'je8k7`VA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ] ^; b  
{ wrQydI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]M~8 @K  
 { *f`s%&Y]s  
  CAboutDlg dlgAbout; i0'Xy>l  
  dlgAbout.DoModal(); U+.PuC[3  
 } .>kccLr:z  
 else a: yB%:2  
 { XhE$&Ff  
  CDialog::OnSysCommand(nID, lParam); abICoP1zQ  
 } ,Um5S6 Z  
} TZh\#dp4l  
6; 5)/q  
void CCaptureDlg::OnPaint() L2CW'Hd  
{ Gg}5$||^C  
 if (IsIconic()) 7MO  
 { n5egKAgA  
  CPaintDC dc(this); // device context for painting m3xz=9Ve  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D|TLTF"  
  // Center icon in client rectangle wX)efLmyhY  
  int cxIcon = GetSystemMetrics(SM_CXICON); $/[Gys3"  
  int cyIcon = GetSystemMetrics(SM_CYICON); 3`&VRF8  
  CRect rect; V< i<0E  
  GetClientRect(&rect); pxw{  
  int x = (rect.Width() - cxIcon + 1) / 2; :3a&Pb*PL  
  int y = (rect.Height() - cyIcon + 1) / 2; ;23=p=/h  
  // Draw the icon *|];f#^9  
  dc.DrawIcon(x, y, m_hIcon); #"Eks79s  
 } t7|MkX1  
 else OgEUq''  
 { k40Ep(M}  
  CDialog::OnPaint(); vIVw'Z(g}  
 } >oft :7p  
} e=gboR  
z}> 4,d  
HCURSOR CCaptureDlg::OnQueryDragIcon() w~<FG4@LU  
{ -l-AToO4  
 return (HCURSOR) m_hIcon; =<[7J]%  
} t/JOERw  
xw4ey<"I  
void CCaptureDlg::OnCancel() jOBY&W0r  
{ hz< |W5  
 if(bTray) !~K=#"T  
  DeleteIcon(); \R86;9ov  
  CDialog::OnCancel(); @Pxw hlxa  
} DH\wDQ  
a?zR8$t|  
void CCaptureDlg::OnAbout() !Z U_,[  
{ "?i>p z  
 CAboutDlg dlg; 5U0ytDZ2/(  
 dlg.DoModal(); L"[IOV9S  
} oy2(Ag\  
tgO+*q5B  
void CCaptureDlg::OnBrowse() R'G'&H{N  
{ `aO.=:O_  
 CString str; >65 TkAp  
 BROWSEINFO bi; X$BXT  
 char name[MAX_PATH]; m9#}X_&x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X,>(Y8  
 bi.hwndOwner=GetSafeHwnd(); r~)VGdB+  
 bi.pszDisplayName=name; UG6M9  
 bi.lpszTitle="Select folder"; xe(MHNrj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; oz%h)#;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /"(b.&  
 if(idl==NULL) ]KsGkAG  
  return; 8]My k>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 54=}GnZN  
 str.ReleaseBuffer(); jo_o` j  
 m_Path=str; 3QCMK^#Z:  
 if(str.GetAt(str.GetLength()-1)!='\\') ewo*7j4*  
  m_Path+="\\"; XDHLEG-u(  
 UpdateData(FALSE); xttYn ]T  
}  "\`>2  
"VV914*z  
void CCaptureDlg::SaveBmp() kfVZ=`p}  
{ 6/|U  
 CDC dc; -<O JqB  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); gk"mr_03  
 CBitmap bm; lNHNL a>W  
 int Width=GetSystemMetrics(SM_CXSCREEN); yHl@_rN sC  
 int Height=GetSystemMetrics(SM_CYSCREEN); M6\7FP6G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @|^jq  
 CDC tdc; Z%Vr+)!4  
 tdc.CreateCompatibleDC(&dc); ?hKm&B;d  
 CBitmap*pOld=tdc.SelectObject(&bm); 6%>/og\%  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {n\6BTs  
 tdc.SelectObject(pOld); !2(.$}E  
 BITMAP btm; Cq gJ  
 bm.GetBitmap(&btm); yP x\ltG3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2.]~*7   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y]~IY?I  
 BITMAPINFOHEADER bih; Bk+{}  
 bih.biBitCount=btm.bmBitsPixel; P2>:p%Z  
 bih.biClrImportant=0; ?F1wh2o q  
 bih.biClrUsed=0; "s% 686Vz  
 bih.biCompression=0; )eECOfmnZ  
 bih.biHeight=btm.bmHeight; 0X.TF  
 bih.biPlanes=1; +hpSxdAz4  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0"TgLd  
 bih.biSizeImage=size; Y7-*2"!  
 bih.biWidth=btm.bmWidth; NP "ylMr7P  
 bih.biXPelsPerMeter=0; 6?O}Q7G  
 bih.biYPelsPerMeter=0; L4~ W/6A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $ cq!RgRn  
 static int filecount=0; 'X54dXS?l  
 CString name; }0Y`|H\v  
 name.Format("pict%04d.bmp",filecount++); NJ<N%hcjK  
 name=m_Path+name; `y'aH 'EEd  
 BITMAPFILEHEADER bfh; ):S!Nl  
 bfh.bfReserved1=bfh.bfReserved2=0; 2pz4rc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); MZ)T0|S_  
 bfh.bfSize=54+size; A hR0zg  
 bfh.bfOffBits=54; ~,T+JX  
 CFile bf; Oohq9f#!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \Y9I~8\ gB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vuZf#\zh}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Ym'7vW#~  
  bf.WriteHuge(lpData,size); {b2 aL7  
  bf.Close(); p(.N(c  
  nCount++; )'`CC>Q  
 } U3/8A:$y  
 GlobalFreePtr(lpData); 0F1u W>D1  
 if(nCount==1) 0#<WOns1   
  m_Number.Format("%d picture captured.",nCount); uNy!< u  
 else %w$ mSG  
  m_Number.Format("%d pictures captured.",nCount); ?;_H{/)m  
  UpdateData(FALSE); <z',]hy  
} +ZX .1[O  
Y3<b~!f  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X CzXS.  
{ +|9f%f6vp  
 if(pMsg -> message == WM_KEYDOWN) AO $Wy@  
 { y[7C% Wj  
  if(pMsg -> wParam == VK_ESCAPE) /,X7.t_-  
   return TRUE; 9l#gMFknI  
  if(pMsg -> wParam == VK_RETURN) IYLZ +>  
   return TRUE; $.9 +{mz  
 } hD*(AJ  
 return CDialog::PreTranslateMessage(pMsg); { a. <`  
} {gw [%[ZM  
pD[pTMG@$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QhsVIta  
{ } YRO'Q{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hox< vr4  
  SaveBmp(); j-QGOuvW  
  return FALSE; lM$t!2pRB  
} u (AA`S"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^iuo^2+  
 CMenu pop; D&-vq,c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); i+I0k~wY  
 CMenu*pMenu=pop.GetSubMenu(0); /~tP7<7A  
 pMenu->SetDefaultItem(ID_EXITICON); :s]\k%"  
 CPoint pt; FD))'!>  
 GetCursorPos(&pt);  jC4O`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K_Re}\D  
 if(id==ID_EXITICON) j$mz3Yk  
  DeleteIcon(); zC#%6@P\  
 else if(id==ID_EXIT) qW3x{L$c  
  OnCancel(); }1Z6e[K?  
 return FALSE; tJAnuhX  
} L?Cjo4xS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l/ QhD?)9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &y\igX1  
 AddIcon(); (Igu:=  
 return res; #n#HzbT  
} >x*)GPDa  
FllX za)  
void CCaptureDlg::AddIcon() `6}Yqh))  
{ 5#2jq<D  
 NOTIFYICONDATA data; >MPa38  
 data.cbSize=sizeof(NOTIFYICONDATA); *{4 ETr7  
 CString tip; l|7O)  
 tip.LoadString(IDS_ICONTIP); ;P8(Zf3wJb  
 data.hIcon=GetIcon(0); ~2(]ZfO?>H  
 data.hWnd=GetSafeHwnd(); %i595Ij-]  
 strcpy(data.szTip,tip); %jT w  
 data.uCallbackMessage=IDM_SHELL; +!><5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; op.d;lO@  
 data.uID=98; ly=a>}F_  
 Shell_NotifyIcon(NIM_ADD,&data); w,/6B&|  
 ShowWindow(SW_HIDE); mqw 84u  
 bTray=TRUE; \C7q4p?8  
} C bQ4Y  
) $J7sa  
void CCaptureDlg::DeleteIcon() W"t"X ~T3  
{ \?d TH:v/E  
 NOTIFYICONDATA data; nd.hHQ  
 data.cbSize=sizeof(NOTIFYICONDATA); 7 OWsHlU  
 data.hWnd=GetSafeHwnd(); # M>wH`Q#  
 data.uID=98; ,_bp)-OG  
 Shell_NotifyIcon(NIM_DELETE,&data); xh r[ A  
 ShowWindow(SW_SHOW); }#bZ8tm&  
 SetForegroundWindow(); GMw)*  
 ShowWindow(SW_SHOWNORMAL); *Dc@CmBr  
 bTray=FALSE; YD9!=a$  
} fbV@=(y?  
.`+yo0O:  
void CCaptureDlg::OnChange() O J>iq@ >  
{ WN\PX!K9  
 RegisterHotkey(); a%*_2#  
} -K^41W71  
tgB=vIw?3  
BOOL CCaptureDlg::RegisterHotkey() `O n(v  
{ R>HY:-2  
 UpdateData(); }1@E"6kF  
 UCHAR mask=0; ^cn@?k((A  
 UCHAR key=0; #a'r_K=ch)  
 if(m_bControl) sG1BNb_  
  mask|=4; ST% T =_q  
 if(m_bAlt) s??czM2O  
  mask|=2; _#vGs:-x&  
 if(m_bShift) ^)<w*iqBD  
  mask|=1; SBL+e]P  
  key=Key_Table[m_Key.GetCurSel()]; ?Sw /(}|m  
 if(bRegistered){ !-,Ww[G>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); +A\V)  
  bRegistered=FALSE; q:8\ e  
 } K_&_z  
 cMask=mask; vpV$$=Qwp  
 cKey=key; Qsji0ikG  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y!5:dvt  
 return bRegistered; GW8CaTf~  
} $Elkhe]O %  
ckWkZ 78\  
  四、小结 bRsc-Fz6  
*IqVY&  
  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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