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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: |r>+\" X  
  Z-z^0QO  
  一、实现方法 (~q.YJ'  
r'/&{?Je/  
  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: /99S<U2ej  
YcOPqvQ  
#pragma data_seg("shareddata") O]3$$uI=QE  
HHOOK hHook =NULL; //钩子句柄 EmNJ_xY  
UINT nHookCount =0; //挂接的程序数目 = .a}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 RtO3!dGT.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +pXYBwH 7Q  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |;sL*Vr  
static int KeyCount =0; I! eu|_cF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 IO3p&sJ/  
#pragma data_seg() CT1@J-np  
'9@S  
  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。 p!B& &)&db  
;)$bhNFHx  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: o&0fvCpW  
: fMQ,S0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6B`XHdCq  
cKey,UCHAR cMask) "jV :L  
{ <+Eu.K&  
 BOOL bAdded=FALSE; C@d*t?  
 for(int index=0;index<MAX_KEY;index++){ !xk`oW  
  if(hCallWnd[index]==0){ .8e]-^Z  
   hCallWnd[index]=hWnd; Oy EOb>  
   HotKey[index]=cKey; P1C{G'cR  
   HotKeyMask[index]=cMask; /S2lA>  
   bAdded=TRUE; (K xI*  
   KeyCount++; C# zYZ JZ  
   break; 1Xzgm0OS;  
  } QTr) r;Tro  
 } mv] .  
 return bAdded; -UY5T@as  
} IUf&*'_  
//删除热键 uPCzs$R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V6Z~#=EQ  
{ $~7uDq  
 BOOL bRemoved=FALSE; ^/]w}C#:d  
 for(int index=0;index<MAX_KEY;index++){ M^IEu }  
  if(hCallWnd[index]==hWnd){ ?#s9@R1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ " GRR,7A  
    hCallWnd[index]=NULL; & pHSX  
    HotKey[index]=0; bUvVt3cm  
    HotKeyMask[index]=0; Z5/*i un  
    bRemoved=TRUE; ,Tp:. "  
    KeyCount--; tV?-   
    break; k_;g-r,  
   } q)j b9e   
  } 5"sd  
 } +pUG6.j%  
 return bRemoved; ]2E#P.-!b  
} +MZsL7%  
GmhfBW?  
P* X^)R  
  DLL中的钩子函数如下: f/xQy}4+~E  
i4T=4q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xVxN @[  
{ #q LsAw--Q  
 BOOL bProcessed=FALSE; ly[j=vBV  
 if(HC_ACTION==nCode) ^_\S)P2c  
 { =hRo#]{(K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |7%has3"  
   switch(wParam) [}$jO,H5r  
   {  #`]`gNB0Yg  
    case VK_MENU: ej91)3AO  
     MaskBits&=~ALTBIT; f \ E9u}  
     break; +Vv+<M  
    case VK_CONTROL: 5Ve`j,`=<  
     MaskBits&=~CTRLBIT; *kY JwO^  
     break; TWSqn'<E  
    case VK_SHIFT: L|hELWru  
     MaskBits&=~SHIFTBIT; '4KN  
     break; 'p FK+j  
    default: //judge the key and send message c,CcKy;+  
     break; <)$&V*\  
   } jOUM+QO  
   for(int index=0;index<MAX_KEY;index++){ pO?v$Rjl  
    if(hCallWnd[index]==NULL) -kF8ZF  
     continue; h* 72 f/#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y`NwE  
    { ?e{hidg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :6gRoMb]  
     bProcessed=TRUE; h+rW%`B  
    } C5Vlqc;  
   } ~3& *>H^U  
  } V15/~  
  else if((lParam&0xc000ffff)==1){ //有键按下 vh"wXu  
   switch(wParam) 0Q7|2{  
   { z:^ (#G{  
    case VK_MENU: 8n/8uRIR  
     MaskBits|=ALTBIT; 9dVHh?E  
     break; YsO3( HS  
    case VK_CONTROL: qnb#~=x^  
     MaskBits|=CTRLBIT; GIb,y,PDB  
     break; ARUzEo gcf  
    case VK_SHIFT: ]z O6ESH  
     MaskBits|=SHIFTBIT; ;fW`#aE  
     break; #V{!|Y'  
    default: //judge the key and send message M!YGv   
     break; B?%e-xV-  
   } 15z(hzU?#  
   for(int index=0;index<MAX_KEY;index++){ buldA5*!o  
    if(hCallWnd[index]==NULL) R]&lVXyH  
     continue; `h%K8];<6f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6t\0Ui  
    { G %A!yV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); enGZb&  
     bProcessed=TRUE; ~9y/MR  
    } M ~ ;]d  
   } |(<A)C  
  } vA"LV+@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /HH_Zi0?N|  
   for(int index=0;index<MAX_KEY;index++){ .wV-g:2  
    if(hCallWnd[index]==NULL) ;il+C!6zpf  
     continue; A]laS7Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :}U jX|D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k QF3DR$,B  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 e'yw8U5E/  
   } g@'2 :'\  
  } >*/:"!u  
 } }Ug$d>\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NR,R.N^[  
} :d6]rOpX  
j.!5&^;u4  
  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: EfB.K}b^  
!hFzIp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qZdA%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IyEfisOK?  
: HM~!7e  
  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: .6!cHL3ln  
bt*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2]y Hxo/6  
{ \[G"/]J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;qO3m -(d  
 { Kv)Kn8df  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 f?r{Q  
  SaveBmp(); AJ>$`=  
  return FALSE; 'rNLh3  
 } Wf3{z D~  
 …… //其它处理及默认处理 cA+T-A]  
} ef7BG(  
6?ky~CV  
#@' B\!<@=  
  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。 27i-B\r  
l_s#7.9$  
  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。 x~i\*Ox^  
DS+BX`i%#p  
  二、编程步骤 _ FNW[V  
xS(VgP&YGO  
  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"; d}aMdIF!e  
G6}!PEwM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; # 0d7  
f 8\DAN  
  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; SKF0p))BJ  
'C=(?H)M  
  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; L=<$^m  
U'^ G-@  
  5、 添加代码,编译运行程序。 l, 9r d[  
TS`m&N{i")  
三、程序代码 f9OY> |a9  
Y[|9 +T  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL g*Pn_Yo[.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Lf:#koaC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ guVuO  
#if _MSC_VER > 1000 yf[1?{iVo  
#pragma once G)?j(El  
#endif // _MSC_VER > 1000 <00nu'Ex1v  
#ifndef __AFXWIN_H__ \x<,Ma=D  
#error include 'stdafx.h' before including this file for PCH ] *U+nG  
#endif #)m [R5g(  
#include "resource.h" // main symbols Em4'b1mDX%  
class CHookApp : public CWinApp XTA:Y7"O  
{  #]QS   
 public: Q8A+\LR~)  
  CHookApp(); }+}Cl T  
  // Overrides Ga+Cb2$  
  // ClassWizard generated virtual function overrides Z<W f/  
  //{{AFX_VIRTUAL(CHookApp) ;s#I b_  
 public: i1X!G|Awfv  
  virtual BOOL InitInstance(); L8f_^ *,  
  virtual int ExitInstance(); z}iz~WZ  
  //}}AFX_VIRTUAL <>(v~a]  
  //{{AFX_MSG(CHookApp) vM-kk:n7f  
  // NOTE - the ClassWizard will add and remove member functions here. y<*\D_J  
  // DO NOT EDIT what you see in these blocks of generated code ! A8QUfg@uK~  
  //}}AFX_MSG k.})3~F-  
  DECLARE_MESSAGE_MAP() O 3?^P"C  
}; Rqbz3h~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *%\Xw*\0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W6`_ lGTj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mhM;`dl  
BOOL InitHotkey(); Y O|hwhe_  
BOOL UnInit(); R%~~'/2V  
#endif #V)l>  
j+>[~c;0)  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t\]kVo)  
#include "stdafx.h" 'SXLnoeTa  
#include "hook.h" ;1s;"  
#include <windowsx.h> ]<ay_w;  
#ifdef _DEBUG I?nU+t;  
#define new DEBUG_NEW tKeozV[V  
#undef THIS_FILE -7XaS&.4  
static char THIS_FILE[] = __FILE__; ,S m?2<  
#endif `gF ]  
#define MAX_KEY 100 C^LxJG{L5  
#define CTRLBIT 0x04 4]E1x l  
#define ALTBIT 0x02 _j4 K  
#define SHIFTBIT 0x01 R6`mmJ+'  
#pragma data_seg("shareddata") 9':Hh'  
HHOOK hHook =NULL; h#Mx(q  
UINT nHookCount =0; B qINU  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey w11L@t[5W8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O>I%O^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +3M1^:  
static int KeyCount =0; d|`8\fq  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fB&i{_J  
#pragma data_seg() cp"{W-Q{$  
HINSTANCE hins; *3h_'3yo@  
void VerifyWindow(); 7*%}=.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _{ 2`sL)  
//{{AFX_MSG_MAP(CHookApp) kyZZ0  
// NOTE - the ClassWizard will add and remove mapping macros here. ONZ(0H{ 1$  
// DO NOT EDIT what you see in these blocks of generated code! ~]Av$S  
//}}AFX_MSG_MAP Bs|#7mA[  
END_MESSAGE_MAP() hhhxsGyv  
@$CPTv3e  
CHookApp::CHookApp() 6(7dr?^eGT  
{ ;mr*$Iu7|  
 // TODO: add construction code here, >L8 & 6aU  
 // Place all significant initialization in InitInstance N/b$S@  
} ~eS/gF?  
k nzo6  
CHookApp theApp; tkff\W[JU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z^Wv(:Nr  
{ %tPy]{S..  
 BOOL bProcessed=FALSE; [g}0.J`_  
 if(HC_ACTION==nCode) ![eY%2;<  
 { 1bDAi2 H  
  if((lParam&0xc0000000)==0xc0000000){// Key up a<]vHC7  
   switch(wParam) Ji1#>;&  
   { 5Vdy:l  
    case VK_MENU: 3[?;s}61  
     MaskBits&=~ALTBIT; Su[(IMw  
     break; E$A=*-u  
    case VK_CONTROL: gxJ12' m  
     MaskBits&=~CTRLBIT; h`eHoKJ#w  
     break; b\kA  
    case VK_SHIFT: _;/+8=  
     MaskBits&=~SHIFTBIT; (]VY==t~  
     break; 7VdxQ T  
    default: //judge the key and send message [\%a7ji#  
     break; biForT_no  
   } ;TK$?hrv*1  
   for(int index=0;index<MAX_KEY;index++){ *(XGNp[0  
    if(hCallWnd[index]==NULL) bPkz=^-  
     continue;  @k#xr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T11>&K)  
    { x8C *  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _KBa`lhE  
     bProcessed=TRUE; \/nSRAk  
    } ~]9EhC'l  
   } cXr_,>k  
  } TTWiwPo59  
  else if((lParam&0xc000ffff)==1){ //Key down |+JC'b?,  
   switch(wParam) ccx0aC3@I  
   { }AiF 7N0  
    case VK_MENU: 'geN  dx  
     MaskBits|=ALTBIT; J/,m'wH  
     break; I>6zX  
    case VK_CONTROL: m;TekJXm  
     MaskBits|=CTRLBIT; 5^CWF|  
     break; gR_Exs'K  
    case VK_SHIFT: @Jb-[W$*  
     MaskBits|=SHIFTBIT; Uc ; S@  
     break; g706*o)h  
    default: //judge the key and send message l<(jm{q?u  
     break; 5zyd;y)|'  
   } S!^I<#d K  
   for(int index=0;index<MAX_KEY;index++) ux 17q>G  
   { T[g(S0dz  
    if(hCallWnd[index]==NULL) DK'S4%;Sp  
     continue; \C2HeA\#SW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gv[(0  
    { 7 9k+R9m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P?jI:'u!R.  
     bProcessed=TRUE; NF-@Q@  
    } -D1 A  
   } JL<<EPC  
  } F7]8*[u  
  if(!bProcessed){ zyt >(A1  
   for(int index=0;index<MAX_KEY;index++){ oh9L2"  
    if(hCallWnd[index]==NULL) >7 cDfv"  
     continue; E}#&2n8Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _fHj8- s/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;E!] /oY<  
   } YM.  
  } %WX^']p  
 } Id>I.e4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Kw:%B|B<T  
} /1bQ RI^\  
5Q8s{WQ  
BOOL InitHotkey() C}pQFL{B5  
{ 2r]o>X  
 if(hHook!=NULL){ Ysw&J}6e  
  nHookCount++; sv#b5,>9  
  return TRUE; s"2+H}u   
 } WY5HmNX3E  
 else i'1 MZ%.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); I= cayR  
  if(hHook!=NULL) %ZDO0P !/  
   nHookCount++; sWKdqs  
  return (hHook!=NULL); =8"xQ>D62  
} r029E-  
BOOL UnInit() ^7t1'A8e<  
{ */|<5X;xIA  
 if(nHookCount>1){ o!c~"  
  nHookCount--; 'TA !JB+  
  return TRUE; pTncx%!W5  
 } 6 .[3N~pq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); HXPq+  
 if(unhooked==TRUE){ R+=wSG]  
  nHookCount=0; YTr+"\CkA  
  hHook=NULL; $' ::51  
 } 4AF.KX7  
 return unhooked; nV8iYBBym  
} ,s:viXk  
h}DKFrHW;-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S&D8Rao5  
{ x`2du/ C  
 BOOL bAdded=FALSE; SDk^fTV8x  
 for(int index=0;index<MAX_KEY;index++){ {M\n  
  if(hCallWnd[index]==0){ ,#%I$  
   hCallWnd[index]=hWnd; l|;]"&|_]c  
   HotKey[index]=cKey; %J9+`uSl  
   HotKeyMask[index]=cMask; .S* sGauM  
   bAdded=TRUE; kE[R9RS!  
   KeyCount++; R D?52\  
   break; A!}Ps"Z  
  } fP$rOJ)P  
 } ;Sp/N4+  
 return bAdded; H6/gRv@  
} FC]n?1?<(  
8= =_43  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F6>oGmLy  
{ YgjN*8w\  
 BOOL bRemoved=FALSE; 9o3?  
 for(int index=0;index<MAX_KEY;index++){ k-)Ls~#+  
  if(hCallWnd[index]==hWnd){ ySF^^X $J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *u< ZQq  
    hCallWnd[index]=NULL; |.- Muv  
    HotKey[index]=0; VSh&Y_%  
    HotKeyMask[index]=0; N:Ir63X*#  
    bRemoved=TRUE; *>xCX  
    KeyCount--; 6` Aw!&{  
    break; 1jaK N*  
   } cIP%t pTW.  
  } +*aC \4w  
 } e{ *yV#Wl  
 return bRemoved; Vjd>j; H  
} Tk `|{Ph0  
vcaPd}nf  
void VerifyWindow() `}rk1rl6  
{  _~S[  
 for(int i=0;i<MAX_KEY;i++){ %joU}G;"  
  if(hCallWnd!=NULL){ JU)k+:\a  
   if(!IsWindow(hCallWnd)){ z*9 ke  
    hCallWnd=NULL; JY~CMR5#.O  
    HotKey=0; s#(%u t  
    HotKeyMask=0; *M$'dLn  
    KeyCount--; MT$)A:"  
   } 8Dn~U :F/?  
  } wzBw5n f\  
 } py'xB i6}v  
} a>Zp?*9  
sk AF6n  
BOOL CHookApp::InitInstance() {i}E)Np  
{ k+Z2)j"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [khXAf1{Q  
 hins=AfxGetInstanceHandle(); zJ@^Bw;A^@  
 InitHotkey(); ntW1 )H'o  
 return CWinApp::InitInstance(); S,Tc\}  
} }<*KM)%  
G^eXJusOv  
int CHookApp::ExitInstance() Q X-n l~  
{ ru4M=D  
 VerifyWindow(); b`F]oQ_*  
 UnInit(); 2.MY8}&WBu  
 return CWinApp::ExitInstance(); 2. v<pqn  
} > `0mn|+  
?/my G{E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8pZOgh  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bR8`Y(=F9b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ NOKU2d4 G  
#if _MSC_VER > 1000 yqB!0) <  
#pragma once H8 xhE~'t  
#endif // _MSC_VER > 1000 0sTR`Xk  
E]=>@EX  
class CCaptureDlg : public CDialog J;4aghzY  
{ jx2{kK  
 // Construction 14 (sp  
 public: \N$)Q.M  
  BOOL bTray; +[_3h9BK  
  BOOL bRegistered; gYe6(l7m  
  BOOL RegisterHotkey(); O~Bh(_R&  
  UCHAR cKey; LWhP d\  
  UCHAR cMask; ZDov2W  
  void DeleteIcon(); @PctBS<s  
  void AddIcon(); e6^}XRyf  
  UINT nCount; Q|e-)FS)  
  void SaveBmp(); n 8 K6m(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor nd7g8P9p  
  // Dialog Data a,r B7aD  
  //{{AFX_DATA(CCaptureDlg) w4M;e;8m[U  
  enum { IDD = IDD_CAPTURE_DIALOG }; p<,`l)o}~  
  CComboBox m_Key; MH9vg5QKp  
  BOOL m_bControl; +_+j"BT  
  BOOL m_bAlt; g4952u  
  BOOL m_bShift; =itQ@ ``r  
  CString m_Path; |q z%6w=  
  CString m_Number; `#vbV/sM  
  //}}AFX_DATA GR4DxlX  
  // ClassWizard generated virtual function overrides AWKJ@&pA9m  
  //{{AFX_VIRTUAL(CCaptureDlg) > >KCd  
 public: Ps{vN ~}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); a6 1!j>Kx  
 protected: O;|Cu7WU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bdG@%K',  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &b7_%,Bx4  
  //}}AFX_VIRTUAL |(.%`BTD  
  // Implementation OA(.&5]  
 protected: F\L!.B  
  HICON m_hIcon; D /GE-lq  
  // Generated message map functions "Mhn?PTq  
  //{{AFX_MSG(CCaptureDlg) Z!7xRy  
  virtual BOOL OnInitDialog(); 8/&4l,M5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 51y#A Q@  
  afx_msg void OnPaint(); h72CGA|  
  afx_msg HCURSOR OnQueryDragIcon(); ic"8'Rwb  
  virtual void OnCancel(); tC5-^5[y  
  afx_msg void OnAbout(); UGj |)/  
  afx_msg void OnBrowse(); fc9@l a  
  afx_msg void OnChange(); ]5Dh<QY&.  
 //}}AFX_MSG -V;BkE76  
 DECLARE_MESSAGE_MAP() Q WEE%}\3}  
}; Ak8Y?#"wz  
#endif  Ip:54  
(<8}un  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c?u*,d) G  
#include "stdafx.h" RS l*u[fB  
#include "Capture.h" M.r7^9P  
#include "CaptureDlg.h" B?- poB&  
#include <windowsx.h> - l^3>!MAM  
#pragma comment(lib,"hook.lib") 6bLn8UT  
#ifdef _DEBUG  qLP/z  
#define new DEBUG_NEW k ~ByICE  
#undef THIS_FILE N5h9){Mx  
static char THIS_FILE[] = __FILE__; z|X6\8f  
#endif cD}]4  
#define IDM_SHELL WM_USER+1 3?@6QcHl{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X2rKH$<g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ] _5b   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3 yy5 l!fv  
class CAboutDlg : public CDialog D79:L:  
{ <aDZ{T%  
 public: G\TO ]c  
  CAboutDlg(); %^vT7c>  
  // Dialog Data I[d<SHo  
  //{{AFX_DATA(CAboutDlg) ]JV'z<  
  enum { IDD = IDD_ABOUTBOX }; ]bY]YNt{7]  
  //}}AFX_DATA (QJe-)0_y  
  // ClassWizard generated virtual function overrides ovBmo2W/  
  //{{AFX_VIRTUAL(CAboutDlg) xLDD;Qm,  
 protected: g\ vT7x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r$}C<a[U  
  //}}AFX_VIRTUAL m!ueqV"  
  // Implementation upL3M`  
 protected: I "~.p='  
  //{{AFX_MSG(CAboutDlg) G3%Ju=  
  //}}AFX_MSG sA77*T  
  DECLARE_MESSAGE_MAP() j7k}!j_O{  
}; +a 1iZ bh  
8.Y|I5l7G  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y!.jpF'uI  
{ RZ xwr  
 //{{AFX_DATA_INIT(CAboutDlg) =R|XFZ,  
 //}}AFX_DATA_INIT %0N HU`j  
} W ';X4e  
6CIzT.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -p.\fvip  
{ ZcQu9XDIt  
 CDialog::DoDataExchange(pDX); va'F '|  
 //{{AFX_DATA_MAP(CAboutDlg) e)g &q'O  
 //}}AFX_DATA_MAP n=vDEX:'  
} *{!Y_FrL  
hW< v5!,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @q q"X'3t  
 //{{AFX_MSG_MAP(CAboutDlg) Wi'}d6c  
 // No message handlers HOF$(86zqA  
 //}}AFX_MSG_MAP h0@a"DqK  
END_MESSAGE_MAP() eY5mwJ0K  
ElV!C}g  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }|Mwv $`  
: CDialog(CCaptureDlg::IDD, pParent) *_o(~5w-K  
{ kzDN(_<1  
 //{{AFX_DATA_INIT(CCaptureDlg) ;54NQB3L  
  m_bControl = FALSE; e12QYoh  
  m_bAlt = FALSE; ,_I rE  
  m_bShift = FALSE; hEQyaDD;  
  m_Path = _T("c:\\"); D5D *$IC  
  m_Number = _T("0 picture captured."); c{BAQZVc  
  nCount=0; wG3b{0  
  bRegistered=FALSE; =abcLrf2G  
  bTray=FALSE; jk03 Hd  
 //}}AFX_DATA_INIT b j`\;_oo  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YcN|L&R.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E,}{iqAb  
} 7|DG1p9C  
v{VF>qE P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) og5VB  
{ ehr-o7](  
 CDialog::DoDataExchange(pDX); *WQ?r&[_'  
 //{{AFX_DATA_MAP(CCaptureDlg) 6FA+q YSV  
  DDX_Control(pDX, IDC_KEY, m_Key); o8 JOpD  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5mD8$% \8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7"!b5(4=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'bi;Y1:  
  DDX_Text(pDX, IDC_PATH, m_Path); dm4Q'u  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ` 3qf}=Z`  
 //}}AFX_DATA_MAP 2@<_,'  
} 49~d6fH  
H@=oVyn/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ZH_$Q$9  
//{{AFX_MSG_MAP(CCaptureDlg) m9DFnk<D  
 ON_WM_SYSCOMMAND() >.d/@3 '  
 ON_WM_PAINT() o$sD9xx  
 ON_WM_QUERYDRAGICON() %o0b~R  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) P0,]`w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3' i6<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E1eGZ&&Gd  
//}}AFX_MSG_MAP CO='[1"_5  
END_MESSAGE_MAP() g Ed A hfx  
e0zP LU}  
BOOL CCaptureDlg::OnInitDialog() olE(#}7V  
{ u ]e-IYH  
 CDialog::OnInitDialog(); &Q883A J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i/x |c!E  
 ASSERT(IDM_ABOUTBOX < 0xF000); )4L2&e`k)(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^ ` y7JXI:  
 if (pSysMenu != NULL) nF<K84  
 { uL`#@nI  
  CString strAboutMenu; SIJ7Y{\.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); pCs3-&rI3  
  if (!strAboutMenu.IsEmpty()) Fv pU]  
  { t0m;tb bg  
   pSysMenu->AppendMenu(MF_SEPARATOR); q? ' 4&  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "GO!^ZG]  
  } eU1F7LS  
 } mqZH<.mn  
 SetIcon(m_hIcon, TRUE); // Set big icon hCcI]#S&  
 SetIcon(m_hIcon, FALSE); // Set small icon /iU<\+ H  
 m_Key.SetCurSel(0); TTz=*t+D  
 RegisterHotkey(); ]y_ :+SHc  
 CMenu* pMenu=GetSystemMenu(FALSE); @7twe;07r  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -tj#BEC[H(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k$3pmy*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JU?;Kq9R  
 return TRUE; // return TRUE unless you set the focus to a control .9nqJ7]  
} _QL|pLf-  
u}@N Qeg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ba|xf@=&  
{ ,8@<sF B'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) D&%8JL  
 { o08WC'bX  
  CAboutDlg dlgAbout; |g&V? lI  
  dlgAbout.DoModal(); Lv%3 jj  
 } J3eud}w  
 else 8;@y\0  
 { >n"0>[:4  
  CDialog::OnSysCommand(nID, lParam); *7xcwj eP  
 } oy^-?+   
} $hhXsu=  
XV]N}~h o`  
void CCaptureDlg::OnPaint() sgfqIe1  
{ %R0 Wq4}  
 if (IsIconic()) &=g3J4$z  
 { :#YC_ id  
  CPaintDC dc(this); // device context for painting {rc3`<%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); tvI<Why\p  
  // Center icon in client rectangle Ei!Z]jeK  
  int cxIcon = GetSystemMetrics(SM_CXICON); g0B] ;Y>(  
  int cyIcon = GetSystemMetrics(SM_CYICON); s2O()u-  
  CRect rect; ip-X r|Bq  
  GetClientRect(&rect); |a{; <a  
  int x = (rect.Width() - cxIcon + 1) / 2; Nny*C`uDF  
  int y = (rect.Height() - cyIcon + 1) / 2; ;ElCWs->\  
  // Draw the icon W=+n |1  
  dc.DrawIcon(x, y, m_hIcon); @_ %RQO_X  
 } ?'> .>  
 else [c,V=:Cq  
 { ;'S,JGpvT  
  CDialog::OnPaint(); 3FiK/8mu  
 } /vSGmW-*  
} `K{}  
>(RkoExO/  
HCURSOR CCaptureDlg::OnQueryDragIcon() _ $F=A  
{ :^)?AO#J  
 return (HCURSOR) m_hIcon; aopPv&jY  
} 5P!ZGbG  
+e{ui +  
void CCaptureDlg::OnCancel() fd'kv  
{ }yT/UlU  
 if(bTray) ]}L'jK 0  
  DeleteIcon(); jFN0xGZ  
  CDialog::OnCancel(); [MIgQ.n  
} `+,?%W)  
<x}wy+SG  
void CCaptureDlg::OnAbout() NXOXN]=c<  
{ KhR3$|fH<  
 CAboutDlg dlg; DTezG':  
 dlg.DoModal(); &|Gg46P7  
} o/{`\4  
' [$KG  
void CCaptureDlg::OnBrowse() ,JwX*L<:  
{ Z<X=00,wg  
 CString str; eK7A8\;e  
 BROWSEINFO bi; y0xBNhev  
 char name[MAX_PATH]; >=N-P< %  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); DT]4C!dh  
 bi.hwndOwner=GetSafeHwnd(); RL` E}:V  
 bi.pszDisplayName=name; U"Gx Xrl  
 bi.lpszTitle="Select folder"; p<L7qwOii  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; B?j t?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /|v4]t-  
 if(idl==NULL) H:DR?'yW  
  return; [%K6-\S  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); BE0l2[i?  
 str.ReleaseBuffer(); ljbAfd  
 m_Path=str; 1V2]@VQF  
 if(str.GetAt(str.GetLength()-1)!='\\') |=q~X}DA  
  m_Path+="\\"; M(C">L]8  
 UpdateData(FALSE); );!ND %  
} \TP$2i%W  
Q:P)g#suc  
void CCaptureDlg::SaveBmp() tD.#*.7  
{ QM(xMq  
 CDC dc; 38w^=" -T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lj<Sa  
 CBitmap bm; p-s\D_  
 int Width=GetSystemMetrics(SM_CXSCREEN); i9ySD  
 int Height=GetSystemMetrics(SM_CYSCREEN); B#g~c<4<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0qN`-0Yk  
 CDC tdc; _mm(W=KiL  
 tdc.CreateCompatibleDC(&dc); yY8zTWji_  
 CBitmap*pOld=tdc.SelectObject(&bm); Qz@_"wm[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #zsaQg, B  
 tdc.SelectObject(pOld); nD5wN~[J  
 BITMAP btm; @rGY9%E  
 bm.GetBitmap(&btm); %IO*(5f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4Fp[94 b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); DdR0u0JH0  
 BITMAPINFOHEADER bih; UwUHB~<oE  
 bih.biBitCount=btm.bmBitsPixel; Zn9u&!T&  
 bih.biClrImportant=0; gKb,Vrt  
 bih.biClrUsed=0; X.<3 /  
 bih.biCompression=0; f"7MYw\  
 bih.biHeight=btm.bmHeight; f\R_a/Us  
 bih.biPlanes=1; O i\ s  
 bih.biSize=sizeof(BITMAPINFOHEADER); /si<Fp)z  
 bih.biSizeImage=size; #Vum  
 bih.biWidth=btm.bmWidth; utmJ>GWSI  
 bih.biXPelsPerMeter=0; ]Za[]E8MD  
 bih.biYPelsPerMeter=0; 3jZGO9ttnS  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {~9zuNi  
 static int filecount=0; $NR[U+  
 CString name; xb\EJ1M>  
 name.Format("pict%04d.bmp",filecount++); ]T)N{"&N/  
 name=m_Path+name; HO<|EH~lu  
 BITMAPFILEHEADER bfh; I(M/ X/  
 bfh.bfReserved1=bfh.bfReserved2=0; 336ETrG^0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =d Q[I6  
 bfh.bfSize=54+size; xgxfPcI  
 bfh.bfOffBits=54; C+' -TLeu  
 CFile bf; 1o&zA<+NY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nXn@|J&z~U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $.D )Llcq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qWH^/o  
  bf.WriteHuge(lpData,size); i(% 2t(wf+  
  bf.Close(); 1 *' /B  
  nCount++; g|Lbe4?  
 } bll[E}E|3  
 GlobalFreePtr(lpData); *)RKU),3nL  
 if(nCount==1) >N#Nz 0|(  
  m_Number.Format("%d picture captured.",nCount); g**!'T4&o  
 else MFROAVPZ5  
  m_Number.Format("%d pictures captured.",nCount); #e@NV4q  
  UpdateData(FALSE); #QFz /6  
} 9\EW~OgTu  
pFH.beY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e%e.|+  
{ L;0 NR(b!  
 if(pMsg -> message == WM_KEYDOWN) yBy7d!@2  
 { tU?BR<q  
  if(pMsg -> wParam == VK_ESCAPE) U,!qNi}  
   return TRUE; ]EHsRd  
  if(pMsg -> wParam == VK_RETURN) ?7fqWlB  
   return TRUE; =@d#@  
 } CcUF)$kz  
 return CDialog::PreTranslateMessage(pMsg); ;i[JCNiS\  
} 2-@)'6"n  
z%E(o%l8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Tw';;euw  
{ ZbC$Fk,,I&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ lG-B) F  
  SaveBmp(); sUlf4<_zW  
  return FALSE; (m'-1wX.  
} #HV5M1mb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H5 z1_O_+  
 CMenu pop; X{x(p  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;h1hz^Wq  
 CMenu*pMenu=pop.GetSubMenu(0); Tz)Ku  
 pMenu->SetDefaultItem(ID_EXITICON); |m KohV qr  
 CPoint pt; LF7 }gQs ^  
 GetCursorPos(&pt); VEy]vr}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =6U5^+|d  
 if(id==ID_EXITICON) x1Gx9z9  
  DeleteIcon(); 2OUx@Vj  
 else if(id==ID_EXIT) dm}1"BU<  
  OnCancel(); lW5Lwyt8  
 return FALSE; {> ,M  
} )jXKPLj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :h(RS ;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) i[[.1MnS  
 AddIcon(); Ja~8ZrcY  
 return res; ; =n}61  
} ho$}#o  
qh.F}9o  
void CCaptureDlg::AddIcon() 'o)Y!VYnJF  
{ 1?BLL;[a8  
 NOTIFYICONDATA data; c1E{J <pZ  
 data.cbSize=sizeof(NOTIFYICONDATA); Yeg<MrS4D  
 CString tip; J.R]) &CB  
 tip.LoadString(IDS_ICONTIP); 6/ 5c|  
 data.hIcon=GetIcon(0); nl}LT/N  
 data.hWnd=GetSafeHwnd(); |yz[mP*;o  
 strcpy(data.szTip,tip); FaCW +9B  
 data.uCallbackMessage=IDM_SHELL; ;"cQ)=s9Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @Y`Z3LiR$  
 data.uID=98; 'yVe&5?  
 Shell_NotifyIcon(NIM_ADD,&data); v' t'{g%  
 ShowWindow(SW_HIDE); ;.AMP$o`(Y  
 bTray=TRUE; 8Ygf@*9L4  
} 3UXZ|!-  
j_5&w Znq  
void CCaptureDlg::DeleteIcon() L*4"D4V  
{ Gx$m"Jeq\  
 NOTIFYICONDATA data; d;<'28A  
 data.cbSize=sizeof(NOTIFYICONDATA); F5X9)9S  
 data.hWnd=GetSafeHwnd(); j5DCc,s  
 data.uID=98; C7F\Y1Wj  
 Shell_NotifyIcon(NIM_DELETE,&data); OCu_v%G 0  
 ShowWindow(SW_SHOW); T;3qE1c  
 SetForegroundWindow(); FS 5iUH+5  
 ShowWindow(SW_SHOWNORMAL); =~JVU  
 bTray=FALSE; iDcTO}  
} %Mj,\J!  
adu6`2 *$  
void CCaptureDlg::OnChange() gs!'*U)  
{ oUn+tu:  
 RegisterHotkey(); w2xD1oK~o  
} 5wW5 n5YS  
lv?`+tU2_  
BOOL CCaptureDlg::RegisterHotkey() [R1|=kGU  
{ ujnT B*Cqc  
 UpdateData(); A{4,ih"5  
 UCHAR mask=0; }j2;B 8j  
 UCHAR key=0; >d`GNE  
 if(m_bControl) t]0DT_iE  
  mask|=4; $}vzBuWHwN  
 if(m_bAlt) j^#p#`m  
  mask|=2; md<^x(h"<  
 if(m_bShift) _IdW5G  
  mask|=1; `uMc.:5\  
  key=Key_Table[m_Key.GetCurSel()]; Q9 AvNj>X  
 if(bRegistered){ vE,^K6q0`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hBRi5&%  
  bRegistered=FALSE; L754odc  
 } ;6 W[%{  
 cMask=mask; cY5;~lO  
 cKey=key; OvQzMXU^I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xTu J~$(  
 return bRegistered; eI"pRH*f  
} rR":}LA^d  
b>QdP$>  
  四、小结 )NhC+=N  
2~\SUGW-  
  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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