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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: z$32rt8{`v  
  h+f>#O+:  
  一、实现方法 CLb6XnkcA\  
<B"sp r&1  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: >:;dNVz  
/:&!o2&1H  
#pragma data_seg("shareddata") kI\m0];KnQ  
HHOOK hHook =NULL; //钩子句柄 }'X=&3m  
UINT nHookCount =0; //挂接的程序数目 \oQ]=dDCd%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ie}O ZM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 aER|5!7(2\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K"}fD;3  
static int KeyCount =0; m o0\t#jA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 p5Q]/DhG  
#pragma data_seg() i=8iK#2 h  
XH:*J+$O  
  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。 !d* [QD8  
qt GJJ#^,  
  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: 8sG3<$Z^  
092t6D}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^E !v D  
cKey,UCHAR cMask) `+J Fvn!  
{ ,g`%+s7u  
 BOOL bAdded=FALSE; G1"iu8 9d  
 for(int index=0;index<MAX_KEY;index++){ wucdXj{%  
  if(hCallWnd[index]==0){ 4JSPD#%f  
   hCallWnd[index]=hWnd; |m19fg3u  
   HotKey[index]=cKey; "(koR Q  
   HotKeyMask[index]=cMask; Tt[zSlIMx  
   bAdded=TRUE; g8),$:Uw  
   KeyCount++; g(DD8;]w<  
   break; F /b`[  
  } ]6&NIz`:,  
 } _`$LdqgE  
 return bAdded; q>q:ZV  
} ]-PzN'5\'  
//删除热键 ;`9f<d#\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NzRvbj]  
{ Ae)xFnuq3  
 BOOL bRemoved=FALSE; #%"q0"  
 for(int index=0;index<MAX_KEY;index++){ 0MQ= Rt  
  if(hCallWnd[index]==hWnd){ gU9{~-9}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3KLUH=)P  
    hCallWnd[index]=NULL; w7nt $L5  
    HotKey[index]=0;  idmU.`  
    HotKeyMask[index]=0; ~m%[d. }e  
    bRemoved=TRUE; ,N/@=As9$  
    KeyCount--; IS C.~q2  
    break; I8F+Z  
   } ;rh.6Dl  
  } N&8TG  
 } -"(*'hD  
 return bRemoved; wak26W>I3  
} #kg`rrF r  
l,wlxh$}(  
c=\tf~}^Ms  
  DLL中的钩子函数如下: 95;{ms[  
fV:15!S[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B|(g?  
{ 6|97;@94  
 BOOL bProcessed=FALSE; J )1   
 if(HC_ACTION==nCode) h\RX/C!+  
 { :I"CQ C[Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P -m_],  
   switch(wParam) | %_C$s%  
   {  {f*Y}/@  
    case VK_MENU: OhF55,[  
     MaskBits&=~ALTBIT; ~{x1/eH  
     break; I?KN7(9u?  
    case VK_CONTROL: :XKYfc_y  
     MaskBits&=~CTRLBIT; S :HOlJze  
     break; !3Dq)ebBz  
    case VK_SHIFT: ;i{B,!#  
     MaskBits&=~SHIFTBIT; ,5'o>Y  
     break; *MJm:  
    default: //judge the key and send message ?y>N&\pt2  
     break; za l]t$z>  
   } jKSj);  
   for(int index=0;index<MAX_KEY;index++){ I#l}5e5  
    if(hCallWnd[index]==NULL) .X g.,kW  
     continue; mY|c7}>V;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cJKnB!iL5  
    { J_s`G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^0,}y]5p  
     bProcessed=TRUE; [i.@q}c~E  
    } +]l?JKV  
   } $e^"Inhtqp  
  } O7.V>7Y9H  
  else if((lParam&0xc000ffff)==1){ //有键按下 SX3'|'-  
   switch(wParam) :J;U~emq  
   { )1<0c@g=  
    case VK_MENU: cIug~ x>  
     MaskBits|=ALTBIT; @kXuC<  
     break; wGHft`Z  
    case VK_CONTROL: ^} j~:EZb  
     MaskBits|=CTRLBIT; P0N/bp2Uy  
     break; pEB3 qGA  
    case VK_SHIFT: 'r'=%u$1C  
     MaskBits|=SHIFTBIT; m:_#kfC&K"  
     break; zD_5TG M=  
    default: //judge the key and send message .0Ud?v>=  
     break; 3s\UU2yr  
   } vc#o(?g  
   for(int index=0;index<MAX_KEY;index++){ K^{j$  
    if(hCallWnd[index]==NULL) q NGR6i  
     continue; a[ULSYEi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0jp].''RK\  
    { #rHMf%0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H )X[%+  
     bProcessed=TRUE; #y\O+\4e  
    } NT6jwK.?)?  
   } [[T7s(3  
  } Gm+D1l i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @= <{_p  
   for(int index=0;index<MAX_KEY;index++){ V .Kjcy  
    if(hCallWnd[index]==NULL) ]H`wE_2tu  
     continue; 6 `6 I<OJ\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) I!zoo[/)%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1I;q@g0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^P^"t^O  
   } sBlq)h;G?6  
  } Fd8nR9A  
 } h(WlJCln  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2e6P?pX~2  
} -O} )Y>=}  
"t2T*'j{  
  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: ~HY)$Yp;  
`=Mk6$%Cs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1D%P;eUDp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lG6&uMvo  
~'*23]j  
  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: f}dlQkZ(  
tFcQ.1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &4E|c[HN  
{ X&Oo[Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Tp;W  
 { uNewWtUb(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 QXI~Toddj  
  SaveBmp(); 7Kym|Zg  
  return FALSE; _Q:ot'(~0-  
 } Gn7\4,C  
 …… //其它处理及默认处理 K-YxZAf  
} 2?(/$F9X,  
2k!uk6  
/{({f?k<\/  
  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。 .(&6gB  
M+^+u 1QQ0  
  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。 (sn|`k3I  
Fx0<!_tY-  
  二、编程步骤 -OuMC&  
#H1yjJQ /x  
  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"; DI!l.w5P_  
]IkjZ=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |^@TA=_  
Kc\0-3 Z  
  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; Da8qR+*x  
@,sg^KB  
  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; .|{*.YE  
QrHI}r  
  5、 添加代码,编译运行程序。 uRh`qnL  
{Z3B#,V(g  
三、程序代码 ~z^VMr  
89U<9j   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8 POrD8B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [l:3F<M  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~:D}L   
#if _MSC_VER > 1000 tb/bEy^  
#pragma once mfIY7DP  
#endif // _MSC_VER > 1000 8F(_Vqu  
#ifndef __AFXWIN_H__ $Nr :YI  
#error include 'stdafx.h' before including this file for PCH _5^p+  
#endif _MZqH8  
#include "resource.h" // main symbols 7Q<xC  
class CHookApp : public CWinApp qA<PF+f  
{ &Bbs\ ;  
 public: :^DuB_  
  CHookApp(); UW+|1Bj_:  
  // Overrides N\IdZX%u  
  // ClassWizard generated virtual function overrides `J h> 1l  
  //{{AFX_VIRTUAL(CHookApp) 1"r6qYN!>  
 public: .c'EXuI7),  
  virtual BOOL InitInstance(); u4L&8@  
  virtual int ExitInstance(); Ed3 *fY  
  //}}AFX_VIRTUAL Be{7Rj v  
  //{{AFX_MSG(CHookApp) ~_P,z?  
  // NOTE - the ClassWizard will add and remove member functions here. *yqEl O  
  // DO NOT EDIT what you see in these blocks of generated code ! [-cYFdt"V  
  //}}AFX_MSG A]2zK?|s  
  DECLARE_MESSAGE_MAP() w!7f*  
}; C+-xC~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2G8f4vsC[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O $uXQ.r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); />(e.)f  
BOOL InitHotkey(); x68$?CD  
BOOL UnInit(); rrei6$H&  
#endif }"j7Qy)cs  
(eI'%1kS<  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. N5 SK_+  
#include "stdafx.h" YLSp$d4y  
#include "hook.h" 9u/"bj  
#include <windowsx.h> z#*w Na&@[  
#ifdef _DEBUG %ci/(wL  
#define new DEBUG_NEW N=&~3k  
#undef THIS_FILE -E#!`~&V  
static char THIS_FILE[] = __FILE__; dOArXp`s  
#endif UUy|/z%  
#define MAX_KEY 100 ^1M:wX r  
#define CTRLBIT 0x04 zFh JLH*C  
#define ALTBIT 0x02 0jO]+BI1  
#define SHIFTBIT 0x01 7vRJQe)  
#pragma data_seg("shareddata") T_O\L[]p*  
HHOOK hHook =NULL; "q4c[dna  
UINT nHookCount =0; *Z=K9y,IC  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey M@S6V7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ygr[5Tl  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rxQn[  
static int KeyCount =0; wE:hl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @a) x^d  
#pragma data_seg() T<06y3sN  
HINSTANCE hins; 't \:@-tQ  
void VerifyWindow(); ,2vPmff  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g5/%}8[- 2  
//{{AFX_MSG_MAP(CHookApp) A.m#wY8  
// NOTE - the ClassWizard will add and remove mapping macros here. dhpEB J  
// DO NOT EDIT what you see in these blocks of generated code! DYJ@>8  
//}}AFX_MSG_MAP O.e^? ysp/  
END_MESSAGE_MAP() .asHFT7]9  
:^FOh*H  
CHookApp::CHookApp() g<O*4 ]=  
{ -XIjol(  
 // TODO: add construction code here, 2>0[^ .;"  
 // Place all significant initialization in InitInstance P9v N5|"M  
} HJ]\VP9Zb  
7%L%dyN  
CHookApp theApp; rxjMCMF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h|"98PI  
{ 0l!%}E  
 BOOL bProcessed=FALSE; 7yxZe4~|#  
 if(HC_ACTION==nCode) di}YHMTx  
 { :<4:h.gO8  
  if((lParam&0xc0000000)==0xc0000000){// Key up nk9Kq\2f:  
   switch(wParam) Z{7lyEzBg  
   { Fyoy)y*  
    case VK_MENU: RRig  
     MaskBits&=~ALTBIT; $w`QQ^\  
     break; X*VHi  
    case VK_CONTROL: IZY q  
     MaskBits&=~CTRLBIT; r 11:T3  
     break; !tBNA  
    case VK_SHIFT: 6b4Kcl<i  
     MaskBits&=~SHIFTBIT; {C Qo}@.7  
     break; @kC>+4s!  
    default: //judge the key and send message nw[DI %Tp  
     break; J Sz'oA5  
   } ja*k\w{U'  
   for(int index=0;index<MAX_KEY;index++){ VQV7W  
    if(hCallWnd[index]==NULL) I <`9ANe  
     continue; R4GmUCKB=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4Waot  
    { xcr=AhqM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @gc lks/M  
     bProcessed=TRUE; [RG&1~  
    } Y ::\;s  
   } IE!fNuR4  
  } b}4k-hZL  
  else if((lParam&0xc000ffff)==1){ //Key down J"'2zg1&  
   switch(wParam) cGiS[-g  
   { FU/yJy  
    case VK_MENU: J;4x-R$W  
     MaskBits|=ALTBIT; 4&;.>{ :;  
     break; 4mSL*1j  
    case VK_CONTROL: b{qeu$G R  
     MaskBits|=CTRLBIT; ei'=%r8~  
     break; [?$ZB),L8  
    case VK_SHIFT: I9P< !#q>  
     MaskBits|=SHIFTBIT; z:<mgp&/<  
     break; K}ACZT)Wp  
    default: //judge the key and send message 2T/C!^iJ)  
     break; ! )$ PD@  
   } N+)4]ir>  
   for(int index=0;index<MAX_KEY;index++) <r]7xsr  
   { .CH0P K=l  
    if(hCallWnd[index]==NULL) J&UFP{)  
     continue; j(/Bf m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) un0t zz  
    { e:}8|e~T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  {n}6  
     bProcessed=TRUE; c7T9kV 8hS  
    } \7z&iGe!  
   } _KiaeVE  
  } xExy?5H7  
  if(!bProcessed){ 49n.Gc  
   for(int index=0;index<MAX_KEY;index++){ A3ad9?LR[R  
    if(hCallWnd[index]==NULL) ) ?rJKr[`  
     continue; Rro|P_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lQQXV5NV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S W(h%`U  
   } }T%;G /W  
  } I$0JAy  
 } HH+R47%*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I7b(fc-r  
} qQN&uBQ[  
dq~p]h~,H  
BOOL InitHotkey() 'TpW-r:  
{ Y W_E,A>h  
 if(hHook!=NULL){ NhQIpzL)  
  nHookCount++; w] LN(o:  
  return TRUE; EB jiSQw  
 } tVQfR*=  
 else \W;~[-"#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); zMb7a_W  
  if(hHook!=NULL) 6'ye-}vD-  
   nHookCount++; eU_|.2  
  return (hHook!=NULL); NWPL18*C  
} >R3~P~@30  
BOOL UnInit() %~P]x7%|  
{ ;>[).fX>/  
 if(nHookCount>1){ lGqwB,K$z4  
  nHookCount--; {n%-^9b1{&  
  return TRUE; GyJp! xFB  
 } kH*l83  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r:K)Q@  
 if(unhooked==TRUE){ [bkMl+:/HG  
  nHookCount=0; T_Q/KhLU  
  hHook=NULL; AoyU1MR(  
 } 6,M>'s,N  
 return unhooked; Ou/@!Y1  
} uxk&5RY  
0TU~Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Pgf$GXE  
{ /tA$ 'tZ  
 BOOL bAdded=FALSE; R0+v5E  
 for(int index=0;index<MAX_KEY;index++){ E*IkI))X0  
  if(hCallWnd[index]==0){ Mo &Ia6^  
   hCallWnd[index]=hWnd; $/,qw   
   HotKey[index]=cKey; N'Va&"&73>  
   HotKeyMask[index]=cMask; 0*V RFd4  
   bAdded=TRUE; R?1;'pvpa[  
   KeyCount++; k#`.!yI,  
   break; =Y|TShKk  
  } G,>tC`!  
 } ~$#DB@b  
 return bAdded; :BCjt@K}  
} {.SN  
UY j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?yddr`?W  
{ Eag->mw/~  
 BOOL bRemoved=FALSE; :Y y+%  
 for(int index=0;index<MAX_KEY;index++){ wQb")3dw  
  if(hCallWnd[index]==hWnd){ L':;Vv~-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gm8L5c V  
    hCallWnd[index]=NULL; ,!kqEIp%  
    HotKey[index]=0; gd.P%KC!g  
    HotKeyMask[index]=0; ?v#t{e0eQ  
    bRemoved=TRUE; /4 RKA!W  
    KeyCount--; zF<*h~  
    break; nk1(/~`  
   } Um;ReJ8z  
  } o; 6\  
 } g6Qzkvw)  
 return bRemoved; 8qrE<RHU@  
} R8W{[@  
5WP)na6"  
void VerifyWindow() `CUTb*{`  
{ mKvk6OC  
 for(int i=0;i<MAX_KEY;i++){ TC<_I0jCh  
  if(hCallWnd!=NULL){ p4fU/  
   if(!IsWindow(hCallWnd)){ {qp XzxV  
    hCallWnd=NULL; Zyu4!  
    HotKey=0; 4@.qM6 \\q  
    HotKeyMask=0; v<ASkkh>  
    KeyCount--; u+EZ"p;o  
   } F3nYMf  
  } $ /`X7a{  
 } |ht:_l 8  
} o-I:p$B-  
g$f+X~Q  
BOOL CHookApp::InitInstance() =T!eyGE  
{ *!oV?N[eA'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); HOt,G _{  
 hins=AfxGetInstanceHandle(); #.rkvoB0N  
 InitHotkey(); E mg=,  
 return CWinApp::InitInstance(); X::@2{-@y  
} vf zC2  
t{g@z3  
int CHookApp::ExitInstance() BTD_j&+(  
{ _CPj] m{  
 VerifyWindow(); \61H(,  
 UnInit(); L[ZS17 ;*  
 return CWinApp::ExitInstance(); @  R[K8  
} aGBd~y@e  
wK0x\V6dJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >yr;Y4y7K  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s >:gL,%c  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zJP jsD]  
#if _MSC_VER > 1000 -.r"|\1X  
#pragma once X&HYWH'@,  
#endif // _MSC_VER > 1000 &',#j]I  
&a4FGzR#  
class CCaptureDlg : public CDialog etT9}RbQ  
{ BdMd\1eMw  
 // Construction CcW3o"=4  
 public: W**[:n+  
  BOOL bTray; t #Kucde  
  BOOL bRegistered; $3B%4#s  
  BOOL RegisterHotkey(); |$6Ten[B#  
  UCHAR cKey; qtdkK LT  
  UCHAR cMask; vmEn$`&2t  
  void DeleteIcon(); yZ 7)|j  
  void AddIcon();  ZB |s/  
  UINT nCount;  [Rub  
  void SaveBmp(); hxj\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor fPHV]8Ft|  
  // Dialog Data Kp*3:XK  
  //{{AFX_DATA(CCaptureDlg)  ]Tb?z&  
  enum { IDD = IDD_CAPTURE_DIALOG }; +,,dsL  
  CComboBox m_Key; RhKDQGdd  
  BOOL m_bControl; utRO?]%d !  
  BOOL m_bAlt; 50dN~(;p  
  BOOL m_bShift; J~xm[^0  
  CString m_Path; P=1K u|k  
  CString m_Number; @67GVPcxl  
  //}}AFX_DATA tV_3!7m0$  
  // ClassWizard generated virtual function overrides b$0;fEvIJn  
  //{{AFX_VIRTUAL(CCaptureDlg) O7_y QQAA  
 public: ygV_"=+|N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); I$S*elveG  
 protected: +|b#|>6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JL!^R_b&c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~:k r;n2  
  //}}AFX_VIRTUAL N%'(8%;  
  // Implementation <$hv{a  
 protected: .SmG)5U]  
  HICON m_hIcon; @YRy)+  
  // Generated message map functions k&:q|[N  
  //{{AFX_MSG(CCaptureDlg) w8~R=k  
  virtual BOOL OnInitDialog(); bf=\ED^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #g@4c3um|  
  afx_msg void OnPaint(); 9>0OpgvC(  
  afx_msg HCURSOR OnQueryDragIcon(); y{<js!au  
  virtual void OnCancel(); \!jz1`]&{  
  afx_msg void OnAbout(); [ _ `yy  
  afx_msg void OnBrowse(); o<p4r}*AVJ  
  afx_msg void OnChange(); 8+7*> FD)1  
 //}}AFX_MSG rN7JJHV  
 DECLARE_MESSAGE_MAP() AxH`4=3<  
}; 9=6BQ`u  
#endif v!DK.PZbi  
}@jJv||  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /=l!F'  
#include "stdafx.h" %-$ :/ N  
#include "Capture.h" 8kSyT'k C%  
#include "CaptureDlg.h" %Qb}z@>fJk  
#include <windowsx.h> /&G|.Cx  
#pragma comment(lib,"hook.lib") Het>G{  
#ifdef _DEBUG +A1*e+/b\  
#define new DEBUG_NEW q&3(yhx  
#undef THIS_FILE >dgq2ok!u  
static char THIS_FILE[] = __FILE__; R>~I8k9mM  
#endif ~.J*_0~Ze  
#define IDM_SHELL WM_USER+1 vfj{j= G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {|OXiRm'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pRxVsOb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; % jf|efxo  
class CAboutDlg : public CDialog ^*UtF9~%n  
{ [~cz| C#  
 public: fWWB]h  
  CAboutDlg(); ki2 `gLK  
  // Dialog Data #H |p)2k  
  //{{AFX_DATA(CAboutDlg) {*g{9`   
  enum { IDD = IDD_ABOUTBOX }; yKK9b  
  //}}AFX_DATA ndT_;==  
  // ClassWizard generated virtual function overrides b{ A/M#=  
  //{{AFX_VIRTUAL(CAboutDlg) Uc ,..  
 protected: z[Qe86L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w8 N1-D42  
  //}}AFX_VIRTUAL (E,[Ad,$  
  // Implementation 1^GRUbOU[  
 protected: l O*  
  //{{AFX_MSG(CAboutDlg) Y}q~ Km  
  //}}AFX_MSG &;r'JIp  
  DECLARE_MESSAGE_MAP() ~@QAa (P.  
}; ~ Al3Dv9x  
E+e),qsbO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _\,lv \u  
{ _akjgwu  
 //{{AFX_DATA_INIT(CAboutDlg) ?UIW&*h}  
 //}}AFX_DATA_INIT 2u5\tp?8  
} (Uu5$q(  
7B5b +  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V!yBH<X  
{ y0?HZ Xq  
 CDialog::DoDataExchange(pDX); Y[>h |@  
 //{{AFX_DATA_MAP(CAboutDlg) pXBh^  
 //}}AFX_DATA_MAP #4"eQ*.*"  
} Uugq.'>  
UmMu|`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `)KGajB  
 //{{AFX_MSG_MAP(CAboutDlg) |)0Ta 9~  
 // No message handlers *> Be w  
 //}}AFX_MSG_MAP GNB'.tJ:0Y  
END_MESSAGE_MAP() i-p,x0th  
^'Rs`e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6CGk*s  
: CDialog(CCaptureDlg::IDD, pParent) L*4= b (3  
{ O7.eq524  
 //{{AFX_DATA_INIT(CCaptureDlg) xb9^WvV  
  m_bControl = FALSE; E[zq<&P@  
  m_bAlt = FALSE; >dw 0@T&p  
  m_bShift = FALSE; MYz!zI  
  m_Path = _T("c:\\"); =,qY\@fq  
  m_Number = _T("0 picture captured."); k,<7)-  
  nCount=0; k 7@:e$7  
  bRegistered=FALSE; QK#qW-49O  
  bTray=FALSE; usoyH0t!?  
 //}}AFX_DATA_INIT xdaq` ^Bbt  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z^4+U n  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1~2+w]-kU  
} #}~?8/h!  
t@+e#3P!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .A6pPRy e  
{ I1dOMu9  
 CDialog::DoDataExchange(pDX); 6L Fhhl^  
 //{{AFX_DATA_MAP(CCaptureDlg) CQ Ei(ty  
  DDX_Control(pDX, IDC_KEY, m_Key); Ic&YiATj  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); At[SkG}b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Hl{ul'o  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Pd `~#!  
  DDX_Text(pDX, IDC_PATH, m_Path); 3G^A^]h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ZdPqU \G^q  
 //}}AFX_DATA_MAP e85E+S%  
} 9q&~!>lt  
<1x u&Z7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z 3Z8vq  
//{{AFX_MSG_MAP(CCaptureDlg) Wap\J7NY  
 ON_WM_SYSCOMMAND() P-yVc2YH  
 ON_WM_PAINT() R@>^t4#_Q0  
 ON_WM_QUERYDRAGICON() !Bg^-F:N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 'r-B%D=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y0) mBCX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qM 3(OvCt  
//}}AFX_MSG_MAP *Csxf[O  
END_MESSAGE_MAP() + I*a=qjq  
"dYT>w  
BOOL CCaptureDlg::OnInitDialog() 7[R`52pP  
{ v=&xiwz}  
 CDialog::OnInitDialog(); 8QI+O`  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SF ^$p$mC  
 ASSERT(IDM_ABOUTBOX < 0xF000); NNJQDkO-I  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dww4o~hO  
 if (pSysMenu != NULL) jsKKg^ g  
 { $0~1;@`rQ6  
  CString strAboutMenu; lD# yXLaC\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !<X/_+G\  
  if (!strAboutMenu.IsEmpty()) G#E8xA"{/  
  { P/k#([:2  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3YUF\L]yyw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )! k l:  
  } k@>(sXs  
 } Ca/N'|}^  
 SetIcon(m_hIcon, TRUE); // Set big icon 9%MgAik(  
 SetIcon(m_hIcon, FALSE); // Set small icon e%7#e%1s  
 m_Key.SetCurSel(0); ]\ZmK0q<:  
 RegisterHotkey(); AJ#YjkO>]  
 CMenu* pMenu=GetSystemMenu(FALSE); (8NE'd8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); }p8iq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LW!4KA]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nLrCy5R:  
 return TRUE; // return TRUE unless you set the focus to a control srKEtd"  
} Tj6Czq=*%T  
x4?g>v*J  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :j32 :/u  
{ ;j<#VS-]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _ZK*p+u%  
 { a`U/|[JM  
  CAboutDlg dlgAbout; YYe=E,q  
  dlgAbout.DoModal(); [BEQ ~A_I  
 } G//hZwf0  
 else D'UIxc8  
 { sM9utR  
  CDialog::OnSysCommand(nID, lParam); 4 *. O%  
 } ~svea>Fmr  
} Zb<D%9  
*c(YlfeZ#  
void CCaptureDlg::OnPaint() Dh68=F0  
{ p@d_Ru  
 if (IsIconic()) aZq7(pen  
 { 8rLhOA  
  CPaintDC dc(this); // device context for painting /%b nG(4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !&{"tL@.  
  // Center icon in client rectangle VMu?mqEa  
  int cxIcon = GetSystemMetrics(SM_CXICON); K}Q:L(SSr\  
  int cyIcon = GetSystemMetrics(SM_CYICON); #9HX"<5  
  CRect rect; Q-yNw0V}F  
  GetClientRect(&rect); @J'tPW<$  
  int x = (rect.Width() - cxIcon + 1) / 2; ?*~sx=mC  
  int y = (rect.Height() - cyIcon + 1) / 2; rG%8ugap  
  // Draw the icon ^SIA%S3  
  dc.DrawIcon(x, y, m_hIcon); H=mFc@fh  
 }  ;B{oGy.  
 else G#1W":|`  
 { nPjK=o`KR  
  CDialog::OnPaint(); \GZ|fmYn  
 } 8zho\'  
} !L2!:_  
D&OskM60  
HCURSOR CCaptureDlg::OnQueryDragIcon() $s"-r9@q  
{ uF[~YJ>  
 return (HCURSOR) m_hIcon; 1aPFpo!  
} I [n|#N  
ONF x -U]  
void CCaptureDlg::OnCancel() a>,Zp*V(  
{ UQbk%K2  
 if(bTray) )&%Y{a#  
  DeleteIcon(); CXTt N9N9  
  CDialog::OnCancel(); =JxEM7r  
} i\x@s>@x}  
0#~k)>(7lR  
void CCaptureDlg::OnAbout() _\{/#J;lN  
{ C* 0Z F  
 CAboutDlg dlg; sj6LrE=1  
 dlg.DoModal(); SH O&:2  
} bgkBgugZhX  
/[n]t  
void CCaptureDlg::OnBrowse() }'Ph^ %ox  
{ T # gx2Y  
 CString str; :SY,;..3e  
 BROWSEINFO bi;  ^mN`!+  
 char name[MAX_PATH]; i`?yi-R&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >~tx8aI{  
 bi.hwndOwner=GetSafeHwnd(); sn]D7Ae  
 bi.pszDisplayName=name; n(C M)(ozU  
 bi.lpszTitle="Select folder"; a %?v/Ku  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; A=70UL  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <&bBE"U4  
 if(idl==NULL) Dn#UcMO>W  
  return; qxYCT$1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;Zn&Nc7  
 str.ReleaseBuffer(); XEN-V-Z%*  
 m_Path=str; @q{.  
 if(str.GetAt(str.GetLength()-1)!='\\') Nnoj6+b  
  m_Path+="\\"; F*-'8~T  
 UpdateData(FALSE); H}(WL+7  
} &%eM  
w{N8Y ~O  
void CCaptureDlg::SaveBmp() ft0tRv(s:  
{ 3} C-Hg+gt  
 CDC dc; JOs kf(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); C:f^&4 3  
 CBitmap bm; J|HV8  
 int Width=GetSystemMetrics(SM_CXSCREEN); w{]B)>! 1W  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]I]G3 e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GoPMWbI7  
 CDC tdc; 4w]<1V  
 tdc.CreateCompatibleDC(&dc); )Lk2tvr  
 CBitmap*pOld=tdc.SelectObject(&bm); =`Ky N/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $>Ow<! c  
 tdc.SelectObject(pOld); u=E &jL5U  
 BITMAP btm; NdRE,HWd?$  
 bm.GetBitmap(&btm); jwI1 I{x  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; UQWv)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "chf \ -!$  
 BITMAPINFOHEADER bih; (&, E}{p9  
 bih.biBitCount=btm.bmBitsPixel; ISTAJ8" D  
 bih.biClrImportant=0; % 3fpIzm  
 bih.biClrUsed=0; }g[Hi`  
 bih.biCompression=0; B}aW y&D  
 bih.biHeight=btm.bmHeight; >xH?`I7;f  
 bih.biPlanes=1; 9<"F3F0|  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^E%NYq_2l<  
 bih.biSizeImage=size; $jBi~QqOf  
 bih.biWidth=btm.bmWidth; rxZk!- t)L  
 bih.biXPelsPerMeter=0; RusiCo!r  
 bih.biYPelsPerMeter=0; 0/cgOP!^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); b>d]= u  
 static int filecount=0; @9k3}x K  
 CString name; W!TT fj   
 name.Format("pict%04d.bmp",filecount++); Svs&?B\}{6  
 name=m_Path+name; 0\eSiXs  
 BITMAPFILEHEADER bfh; ]n$ v ^  
 bfh.bfReserved1=bfh.bfReserved2=0; #}8VUbJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); |@?='E?h  
 bfh.bfSize=54+size; j9cB<atL  
 bfh.bfOffBits=54; 9>_VU"T  
 CFile bf; Eh"Y<]$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ DnN+W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ")fgQ3XZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }Fu2%L>  
  bf.WriteHuge(lpData,size); HhzPKd  
  bf.Close(); H 'nLC,  
  nCount++; Ysi@wK-LnF  
 } 37V$Qb_  
 GlobalFreePtr(lpData); ADMeOdgca  
 if(nCount==1) ~\%H0.P6  
  m_Number.Format("%d picture captured.",nCount); h5^We"}+  
 else ]!@!qp@  
  m_Number.Format("%d pictures captured.",nCount); j\.e6&5%SS  
  UpdateData(FALSE); F[fs^Q6S$  
} u4[JDB7tH  
u R!'v  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) O [=W%2I!i  
{ TI8E W  
 if(pMsg -> message == WM_KEYDOWN) y!j>_m){w  
 { qtP*O#1q  
  if(pMsg -> wParam == VK_ESCAPE) Pfm B{  
   return TRUE; uLN.b339  
  if(pMsg -> wParam == VK_RETURN) / ]nrxT  
   return TRUE; aCBq}Xcn  
 } BJsN~` =r  
 return CDialog::PreTranslateMessage(pMsg); ldG$hk'  
} ~\c  j  
4&~*;an7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q2!RFtXV  
{ >rFM8P(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9|9/8a6A  
  SaveBmp(); v/`#Gu^P  
  return FALSE; >SD?MW 1E  
} 'RR,b*Ql  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K%/g!t)  
 CMenu pop; Fk?KR  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f{'N O`G  
 CMenu*pMenu=pop.GetSubMenu(0); y!\q ', F  
 pMenu->SetDefaultItem(ID_EXITICON); _Aw-{HE'  
 CPoint pt; ;ZZmX]kz,M  
 GetCursorPos(&pt); iyMoLZ5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "3?:,$*  
 if(id==ID_EXITICON) *(VwD)*  
  DeleteIcon(); H]Gj$P=k  
 else if(id==ID_EXIT) 4{" v  
  OnCancel(); "+BuFhSLf  
 return FALSE; CO SQ  
} M5]$w]Ny9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 77G4E ,]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *0 ;|  
 AddIcon(); {d,^tG}  
 return res; FFf ~Vmw  
} c5{3  
OEHw%  
void CCaptureDlg::AddIcon() m] @o1J  
{ e?dR'*-z  
 NOTIFYICONDATA data; Uql7s:!,U  
 data.cbSize=sizeof(NOTIFYICONDATA); [xPO'@Y  
 CString tip; W-vEh  
 tip.LoadString(IDS_ICONTIP); ]@sLX ek  
 data.hIcon=GetIcon(0); bw[K^/  
 data.hWnd=GetSafeHwnd(); 8#a2 kR<b  
 strcpy(data.szTip,tip); b"~Ct}6f  
 data.uCallbackMessage=IDM_SHELL; NW?h~2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; TK%MVLTK  
 data.uID=98; Z`@< O%  
 Shell_NotifyIcon(NIM_ADD,&data); <t.  w(?  
 ShowWindow(SW_HIDE); yrR,7v J  
 bTray=TRUE; n UD;y}}n  
} ':T6m=yv  
.BZ3>]F3<  
void CCaptureDlg::DeleteIcon() 9 N@N U:M+  
{ rh(77x1|(G  
 NOTIFYICONDATA data; EA!I& mBq  
 data.cbSize=sizeof(NOTIFYICONDATA); 1;[ZkRbzL  
 data.hWnd=GetSafeHwnd(); eX{Tyd{  
 data.uID=98; K]Q1VfeL=  
 Shell_NotifyIcon(NIM_DELETE,&data); 5> =Ia@I   
 ShowWindow(SW_SHOW); WR4\dsgCU  
 SetForegroundWindow(); .cg"M0  
 ShowWindow(SW_SHOWNORMAL); `T$CUlt6  
 bTray=FALSE; 7j\jOkl V  
}  =u Ieur  
pkEqd"G  
void CCaptureDlg::OnChange() \g\,  
{ o2NU~Ub  
 RegisterHotkey(); [d,")Ng  
} '~kAsn*/  
WiclG8l  
BOOL CCaptureDlg::RegisterHotkey()  Q ,)}t  
{ VtC1TZ3-7  
 UpdateData(); swT/ tesj  
 UCHAR mask=0; 5oE!^bF?  
 UCHAR key=0; ` Ui|T  
 if(m_bControl) TZ%u;tBH:  
  mask|=4; *ZA.O  
 if(m_bAlt)  -!z,t7!  
  mask|=2; Dz>v;%$S-  
 if(m_bShift) X'h J&-[P  
  mask|=1; .jC-&(R +  
  key=Key_Table[m_Key.GetCurSel()]; sDvtk]4o-4  
 if(bRegistered){ YDr/Cw>J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )6:nJ"j#  
  bRegistered=FALSE; `l8^n0-  
 } F;^GhiQVS  
 cMask=mask; H{3A6fb<  
 cKey=key; 'X(G><R9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F82_#|kpS  
 return bRegistered; _4jRUsvjY  
} IT_Fs|$  
L z'05j3!  
  四、小结 Q>}*l|Ci  
-h<Rby  
  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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