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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: mFgb_Cd  
  K]H"qG.K  
  一、实现方法 z. _C*c  
?{@!!te@3v  
  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: 0,vj,ic*WX  
:|3"H&FWK  
#pragma data_seg("shareddata") C1#o<pv  
HHOOK hHook =NULL; //钩子句柄 q_9N+-?{7  
UINT nHookCount =0; //挂接的程序数目 nK?k<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 DU*g~{8T$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .v #0cQX+.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8T>3@kF  
static int KeyCount =0; y]QQvCJr3d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |*]X\UE  
#pragma data_seg() zCj*:n  
=#POMK".6  
  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。 ((RpT0rP\  
#whO2Mv  
  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: &dZ.+#8r  
V\k5h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7)8rc(58  
cKey,UCHAR cMask) np'M4^E;  
{ w{YtTZp3  
 BOOL bAdded=FALSE; JL]k:i^`A  
 for(int index=0;index<MAX_KEY;index++){ 7N}\1Di5  
  if(hCallWnd[index]==0){ 5H'b4Cyi`  
   hCallWnd[index]=hWnd; (04j4teE  
   HotKey[index]=cKey; Ru9pb~K  
   HotKeyMask[index]=cMask; 6?<`wGs(  
   bAdded=TRUE; , IMT '*  
   KeyCount++; EvH(Po h  
   break; 7b7%(  
  } .=b +O~  
 } #RLch  
 return bAdded; Q8DQ .C  
} %WJ{IXlz  
//删除热键 d 40'3]/{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vZ_DG}n11  
{ W)$|Hm:H  
 BOOL bRemoved=FALSE; 5x1%oC  
 for(int index=0;index<MAX_KEY;index++){ cOZajC<G  
  if(hCallWnd[index]==hWnd){ 9|G=KN)P:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "b1R5(Ar  
    hCallWnd[index]=NULL; RBv=  
    HotKey[index]=0; mk[d7Yt{O  
    HotKeyMask[index]=0; QAOk  
    bRemoved=TRUE; R+ #.bQg  
    KeyCount--; YVZSKU  
    break; O w($\,  
   } g1hg`qBBW  
  } Be14$7r  
 } L3G)?rPFC#  
 return bRemoved; ( 7Ca\H3$  
} zM8/ s96h  
?^G$;X7B  
. f.j >  
  DLL中的钩子函数如下: ZAnO$pA  
S{"6PXzb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @|\s$L  
{ gE6y&a  
 BOOL bProcessed=FALSE; <-oRhi4  
 if(HC_ACTION==nCode) (W}i287  
 { !+*?pq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =DF@kR[CH"  
   switch(wParam)  1+i  
   {  d~z<,_ r5c  
    case VK_MENU:  7 zP  
     MaskBits&=~ALTBIT; /xrq'|r?C  
     break; /J9T=N  
    case VK_CONTROL: "` ?W u  
     MaskBits&=~CTRLBIT; 'bY|$\I  
     break; ;ijfI  
    case VK_SHIFT: \ \mO+N47i  
     MaskBits&=~SHIFTBIT; 1o6J9kCq^3  
     break; R=Ly49  
    default: //judge the key and send message n nnA,  
     break; iqv\ag  
   } k`4\.m"&  
   for(int index=0;index<MAX_KEY;index++){ E*T84Jh6  
    if(hCallWnd[index]==NULL) 7N~qg 7&  
     continue; #35S7G^@`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BI]ut |Qw  
    { ~cg+BAfu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O,xAu}6f+  
     bProcessed=TRUE; ?BWvF]p5/  
    } 5@&i:vs5y  
   } ygy#^  
  } hk$nlc|$  
  else if((lParam&0xc000ffff)==1){ //有键按下 [>]VN)_J5  
   switch(wParam) u2.r,<rC*Q  
   { 2S10j%EeI  
    case VK_MENU: @Qsg.9N3K  
     MaskBits|=ALTBIT; &40JN}  
     break; G'}_ZUy#  
    case VK_CONTROL: &LxzAL,3!  
     MaskBits|=CTRLBIT; YDzF( ']o:  
     break; sp |y/r#  
    case VK_SHIFT: [q+ 39  
     MaskBits|=SHIFTBIT; m+gG &`&u  
     break; VV}fW"_ND  
    default: //judge the key and send message 4z 3$  
     break; I\4`90uBN  
   } \3:{LOr%*  
   for(int index=0;index<MAX_KEY;index++){ ;0X|*w1JO  
    if(hCallWnd[index]==NULL) `zsk*W1GA  
     continue; \3Ald.EqtM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kA :;c}p  
    { L!8?2 \5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W2.1xNWO  
     bProcessed=TRUE; [,A'  
    } m"m;(T{ v  
   } hpi_0lMkI  
  } <n~g+ps  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !VZCM{  
   for(int index=0;index<MAX_KEY;index++){ K'rs9v"K|  
    if(hCallWnd[index]==NULL) Nm:<rI,^  
     continue; N,+g/o\f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +5}T!r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |(w#NE5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;<)-*?m9  
   } <.%8j\j(  
  } j 8AR#  
 } N{z(|2{A#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P:h4  
} ,'{B+CHoS  
te4"+[ $|  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: x 3co?  
>5},qs:lZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^EBM;&;7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3UtXxL&L`  
3)MM5 b b$  
  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: iC0,zk4&  
}~,cCtg:o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZC-evy  
{ Glc4g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Oy`\8*Uy__  
 { =xWW+w!r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 dSD}NM  
  SaveBmp(); D~?*Xv]s ~  
  return FALSE; n[S*gX0  
 } YZtA:>;p  
 …… //其它处理及默认处理 CpdY)SMSL  
} x3F L/^S  
#K*q(ei,7h  
QS?9&+JM|  
  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。 mb6?$1j  
Y~ ?YA/.x  
  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。 |B WK"G  
H9m2Whq  
  二、编程步骤 X10TZ  
<1%XN  
  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"; ieoUZCO^r\  
=` >Nfa+,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; F88SV6  
~(P\F&A(&  
  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; >h-6B=  
.{ Lm  
  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; 3'uES4+r  
Z"nuO\zH~  
  5、 添加代码,编译运行程序。 DQXx}%Px  
7Ki7N{K t  
三、程序代码 m64\@ [  
]`U?<9~Ob  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL z#67rh {  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D(?#oCCA  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S5 vMP N  
#if _MSC_VER > 1000 g {wPw  
#pragma once 05zdy-Fb  
#endif // _MSC_VER > 1000 |}Z"|-Z  
#ifndef __AFXWIN_H__ QN5N h s  
#error include 'stdafx.h' before including this file for PCH c`=h K*  
#endif 3/<^R}w\  
#include "resource.h" // main symbols J-?(sjIX  
class CHookApp : public CWinApp j'b4Sb s-f  
{ 4KB?g7_*  
 public: 5. UgJ/  
  CHookApp(); J, U~ .c  
  // Overrides j-E>*N}-_  
  // ClassWizard generated virtual function overrides D"aQbQP  
  //{{AFX_VIRTUAL(CHookApp) 6j![m+vo%  
 public: l),13"?C(  
  virtual BOOL InitInstance(); 32'9Ch.  
  virtual int ExitInstance(); %R"nm  
  //}}AFX_VIRTUAL :#KURYO<  
  //{{AFX_MSG(CHookApp) } +Z;zm@/6  
  // NOTE - the ClassWizard will add and remove member functions here. ttt&sW`  
  // DO NOT EDIT what you see in these blocks of generated code ! +/8?+1E ^  
  //}}AFX_MSG 9:5NX3"p  
  DECLARE_MESSAGE_MAP() UZ0O j5B.  
}; K`2DhJC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z4sjH1W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TyXOd,%zl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .b)(_*  
BOOL InitHotkey(); teALd~;  
BOOL UnInit(); `G{t<7[[;  
#endif ~/[N)RFD  
ds[~Cp   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. A|nU _*  
#include "stdafx.h" -<.NEV  
#include "hook.h" }+3~y'k  
#include <windowsx.h> 2Rt ZTn  
#ifdef _DEBUG @3D%i#2o&[  
#define new DEBUG_NEW zOp"n\  
#undef THIS_FILE S(xA}0]  
static char THIS_FILE[] = __FILE__; 8)ol6Mi{  
#endif l8li@K  
#define MAX_KEY 100 j* ja)  
#define CTRLBIT 0x04 DzOJ{dF  
#define ALTBIT 0x02 :fUmMta  
#define SHIFTBIT 0x01 ?7s  
#pragma data_seg("shareddata") 0']M,iC/  
HHOOK hHook =NULL; ^<b.j.$<z  
UINT nHookCount =0; 0+h?Bk  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %uMsXa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y[eNM6p  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Y^f|}YO%y  
static int KeyCount =0; K|!)<6ZsG7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift sNTfRPC  
#pragma data_seg() L1+cv;t  
HINSTANCE hins; p gi7 JQ  
void VerifyWindow(); pYQs|5d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sIM`Q%  
//{{AFX_MSG_MAP(CHookApp) XRin~wz|S  
// NOTE - the ClassWizard will add and remove mapping macros here. b6VAyTa  
// DO NOT EDIT what you see in these blocks of generated code! 1Qkuxw  
//}}AFX_MSG_MAP 3g?T,| 2K  
END_MESSAGE_MAP() 8ttw!x69)_  
Ric$Xmu  
CHookApp::CHookApp() #SOe &W5  
{ 4QDzG~N4)|  
 // TODO: add construction code here, 9`b3=&i\  
 // Place all significant initialization in InitInstance o!&*4>tF  
} )A"7l7?.n)  
:W55JD'  
CHookApp theApp; dD!SgK[Jv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N9Vcp~;  
{ A&#Bf#!G  
 BOOL bProcessed=FALSE; KcE=m\h  
 if(HC_ACTION==nCode) J0o[WD$A x  
 { U[u6UG  
  if((lParam&0xc0000000)==0xc0000000){// Key up tL|Q{+i yE  
   switch(wParam) W[ DB !ue  
   { [ j_jee  
    case VK_MENU: YN3uhd[2  
     MaskBits&=~ALTBIT; v4zARE9#  
     break; wVB8PO8  
    case VK_CONTROL: b87d'# .  
     MaskBits&=~CTRLBIT; d?qz7#kc  
     break; N11am  
    case VK_SHIFT: )LUl?  
     MaskBits&=~SHIFTBIT; zyE yZc?  
     break; ;!b(b%  
    default: //judge the key and send message _\zf XHp  
     break; ~<3yTl>  
   } rCYn YA  
   for(int index=0;index<MAX_KEY;index++){ JJr<cZ4]  
    if(hCallWnd[index]==NULL) =>U~ligu  
     continue; $6[]c)(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "k/x+%!Spc  
    { }I0^nv1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SQ[}]Tm;n  
     bProcessed=TRUE; Bf.RYLsh6  
    } s Y,3  
   } g}7B0 yo  
  } :1I,:L  
  else if((lParam&0xc000ffff)==1){ //Key down 3h>Ji1vV  
   switch(wParam)  u[u=:Y+  
   { !~#31kL&  
    case VK_MENU: 1vr/|RWW  
     MaskBits|=ALTBIT; = zSrre  
     break; qi$8GX=~r  
    case VK_CONTROL: 6)8']f  
     MaskBits|=CTRLBIT; @QofsWC  
     break; _<8y^ymo  
    case VK_SHIFT: 0#ph1a<  
     MaskBits|=SHIFTBIT; A@4Cfb@  
     break; ! ^W|;bq  
    default: //judge the key and send message w K+2;*bI  
     break; * HVO  
   } {XAKf_Cg  
   for(int index=0;index<MAX_KEY;index++) U8d  wb  
   { 2;3q](d   
    if(hCallWnd[index]==NULL) 6m]L{ buP  
     continue; ETIf x)B-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sr\MQ?\fB  
    { Qj~0vx!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); pGC`HTo|  
     bProcessed=TRUE; = 2k+/0ZbP  
    } la-+ `  
   } tPUQ"S  
  } qy !G&  
  if(!bProcessed){ l/]P6 @N  
   for(int index=0;index<MAX_KEY;index++){ Kfi A 7W  
    if(hCallWnd[index]==NULL) cb+!H>+  
     continue; R#t~i&v/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) psMagzr&)e  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4xlsdq8`t  
   } &HE8O}<>  
  } REJ}T:  
 } .F]6uXd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HZm44y$/  
} [x&&N*>N  
1Dbe0u  
BOOL InitHotkey() t :_7 O7  
{ wNPZ[V:  
 if(hHook!=NULL){ |(/"IS]  
  nHookCount++; F"q3p4-<>  
  return TRUE; 1)%o:Xy o  
 } </fnbyGR  
 else w-KtxG(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QM IQy  
  if(hHook!=NULL) _CgD7d  
   nHookCount++; FvkKM+?F  
  return (hHook!=NULL); XDn$=`2  
} YpWu\oP  
BOOL UnInit() PU8R 0r2k\  
{ k";;Snk  
 if(nHookCount>1){ dO=<3W  
  nHookCount--; S SzOz-&GA  
  return TRUE; 6 @d( <Z  
 } 9SrV,~zD  
 BOOL unhooked = UnhookWindowsHookEx(hHook); TiOvrp7B  
 if(unhooked==TRUE){ 9(C Ke,  
  nHookCount=0; {3;4=R3  
  hHook=NULL; ScI9.{  
 } W] lFwj  
 return unhooked; qP"m819m  
} 1q*3V8  
sU`#d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fhC=MJ @  
{ fF9vV. }  
 BOOL bAdded=FALSE; 'HC4Q{b`  
 for(int index=0;index<MAX_KEY;index++){ 4fN<pG,  
  if(hCallWnd[index]==0){ bZ389dSn  
   hCallWnd[index]=hWnd; kqy Y:J  
   HotKey[index]=cKey; Jlzhn#5c-  
   HotKeyMask[index]=cMask; ]t,ppFC#  
   bAdded=TRUE; qn<~ LxQ  
   KeyCount++; ^Ab|\ 5^3  
   break; Oz+>I ^Q  
  } ]!f=b\-Av  
 } hGpaHY>My  
 return bAdded; v/kYyz  
} eVy,7goh  
9;@6iv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ut o4bs:  
{ Kp"o0fh<9  
 BOOL bRemoved=FALSE; OaEOk57%de  
 for(int index=0;index<MAX_KEY;index++){ D3_,2  
  if(hCallWnd[index]==hWnd){ Q=+KnE=h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <@?bYp  
    hCallWnd[index]=NULL; 4Iz~3fqB7  
    HotKey[index]=0; 2nw P-i  
    HotKeyMask[index]=0; (j'[t  
    bRemoved=TRUE; .rS0zU  
    KeyCount--; E;+3VJ+F"  
    break; U*6r".sz  
   } $idYG<],  
  } @)1u  
 } <)rol  
 return bRemoved; Oh|Hy/&6W  
} j/9'L^]  
a.q=  
void VerifyWindow() SL*B `P~{  
{ #"TTI vd0  
 for(int i=0;i<MAX_KEY;i++){ En[cg  
  if(hCallWnd!=NULL){ s]}P jh8  
   if(!IsWindow(hCallWnd)){ fHM<6i<C  
    hCallWnd=NULL; )O_Y(^+ $  
    HotKey=0; 7VR+EV  
    HotKeyMask=0; H3&$:h  
    KeyCount--; 2?HLEiI1  
   } HQ]g{JVld\  
  } 7ZN0_Q s  
 } !"_\5$5i<X  
} fu33wz1$}B  
O7E0{8  
BOOL CHookApp::InitInstance() { c]y<q  
{ z0c_&@uj*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8)T.[AP  
 hins=AfxGetInstanceHandle(); ;Lz96R@}  
 InitHotkey(); @c5TSHSL.  
 return CWinApp::InitInstance(); BaqRAO7  
} n&&X{Rl  
o@"H3 gz  
int CHookApp::ExitInstance() G !wFG-Y}  
{ X+iUT  
 VerifyWindow(); p*vEVo  
 UnInit(); b]@^SN9  
 return CWinApp::ExitInstance(); INi(G-!g  
} /-1[}h%U'  
q&7J1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file u>d,6 !  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G/=tC8eX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4R.rSsAH  
#if _MSC_VER > 1000 %gmf  
#pragma once Ioj F/  
#endif // _MSC_VER > 1000 U#-89.x  
PY~cu@'k{  
class CCaptureDlg : public CDialog $o5<#g"/T  
{ cR _ 8 5  
 // Construction ]H%y7kH8  
 public: y1z4qSeM  
  BOOL bTray; Bh<)e5lP:  
  BOOL bRegistered; fsb_*sh&  
  BOOL RegisterHotkey(); r;SA1n#  
  UCHAR cKey; Y=\;$:L[  
  UCHAR cMask; jgbE@IA@!'  
  void DeleteIcon(); cjp H hoW  
  void AddIcon(); n-0RA~5z  
  UINT nCount; Q`'w)aV  
  void SaveBmp(); g"^<LX-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &E0P`F,GQA  
  // Dialog Data yKgA"NaM  
  //{{AFX_DATA(CCaptureDlg) |cUTP!iy  
  enum { IDD = IDD_CAPTURE_DIALOG }; \$W>@w0  
  CComboBox m_Key; J1KV?aR  
  BOOL m_bControl; "'~55bG  
  BOOL m_bAlt; .gzNdSE  
  BOOL m_bShift; ZxLgV$U  
  CString m_Path; .3M=|rE   
  CString m_Number; E:!?A@Fy  
  //}}AFX_DATA r< sx On  
  // ClassWizard generated virtual function overrides |aIY  
  //{{AFX_VIRTUAL(CCaptureDlg) ,p {|f}0  
 public: IXc"gO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bC&*U|de  
 protected: :>+}|(v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support OLg=kF[[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @FU9!  
  //}}AFX_VIRTUAL ha&2V=  
  // Implementation x(ue |UG  
 protected: /J9|.];%r  
  HICON m_hIcon; unY+/p $  
  // Generated message map functions /-4rcC  
  //{{AFX_MSG(CCaptureDlg) W!MO }0s  
  virtual BOOL OnInitDialog(); 2M1}`H\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "Y-_83  
  afx_msg void OnPaint(); Yi:@>A<#  
  afx_msg HCURSOR OnQueryDragIcon(); =^%#F~o:  
  virtual void OnCancel(); %a$ l%8j&  
  afx_msg void OnAbout(); DSf  
  afx_msg void OnBrowse(); [Wf%iwB  
  afx_msg void OnChange(); .?|pv}V  
 //}}AFX_MSG !,WO]O v  
 DECLARE_MESSAGE_MAP() jbZ%Y0km%  
}; gE;r;#Jt4  
#endif [+j }:u  
pbJC A&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file P+K< /i  
#include "stdafx.h" \W:~;GMeD  
#include "Capture.h" LpN_s#  
#include "CaptureDlg.h" =n7QLQU  
#include <windowsx.h> :|%k*z  
#pragma comment(lib,"hook.lib") %zsY=qT  
#ifdef _DEBUG :QGgtTEV""  
#define new DEBUG_NEW vVBu/)  
#undef THIS_FILE Jga;nrU  
static char THIS_FILE[] = __FILE__; J B[n]|  
#endif U|yXJ.Z3  
#define IDM_SHELL WM_USER+1 vM5yiHI(jb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KFZ2%:6>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QmxI ;l  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ->_rSjnM{  
class CAboutDlg : public CDialog s aY;[bz}  
{ #$-{hg{  
 public: *5T^wZpj)  
  CAboutDlg(); H;D 5)eJ90  
  // Dialog Data K;)(fc  
  //{{AFX_DATA(CAboutDlg) hc#Sy:T>  
  enum { IDD = IDD_ABOUTBOX }; &puPn:_  
  //}}AFX_DATA Q &~|P}  
  // ClassWizard generated virtual function overrides ' m^nKG$"  
  //{{AFX_VIRTUAL(CAboutDlg) 9eR4?^(3!  
 protected: M it3q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ' ?tx?t  
  //}}AFX_VIRTUAL 8U86-'Pq  
  // Implementation wjEyU:  
 protected: [P_@-:(O  
  //{{AFX_MSG(CAboutDlg) VCf/EkC  
  //}}AFX_MSG oyC5M+shP9  
  DECLARE_MESSAGE_MAP() VkW N1A  
}; |tn.ZEgw3~  
7F$G.LhMw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2;2FyKF(  
{ Iy[TEB  
 //{{AFX_DATA_INIT(CAboutDlg) D[i?T3i  
 //}}AFX_DATA_INIT m-u3^\'  
} :LrB9Cf$n  
:[\M|iAo  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v0q(k;Ya  
{ 6~b)Hc/  
 CDialog::DoDataExchange(pDX); ^GL>xlZ(  
 //{{AFX_DATA_MAP(CAboutDlg) sx1w5rj.Y0  
 //}}AFX_DATA_MAP JiN>sEAM  
} T"_f9?  
[Fk|%;B/~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2QIx~Er  
 //{{AFX_MSG_MAP(CAboutDlg) y?P4EVknM3  
 // No message handlers >S}^0vNZX  
 //}}AFX_MSG_MAP +d!"Zy2|B  
END_MESSAGE_MAP() _jWGwO  
g>*P}r~;^b  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :q34KP  
: CDialog(CCaptureDlg::IDD, pParent) F<0GX!p4u  
{ O_ 4 j"0  
 //{{AFX_DATA_INIT(CCaptureDlg) IRG-H!FV  
  m_bControl = FALSE; qw<~v?{|C  
  m_bAlt = FALSE; iy-~CPNB_  
  m_bShift = FALSE; Fa+#bX7  
  m_Path = _T("c:\\"); [cso$Tv  
  m_Number = _T("0 picture captured."); 6^vz+oN  
  nCount=0; ~{cG"  
  bRegistered=FALSE; XMlcY;W  
  bTray=FALSE; =wquFA!c  
 //}}AFX_DATA_INIT |V-)3 #c  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Lj2Au_5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W&=F<n`  
} $N/"c$50,  
~0V,B1a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #-7w |  
{ _1ax6MwX  
 CDialog::DoDataExchange(pDX); \Xpq=2`  
 //{{AFX_DATA_MAP(CCaptureDlg) z8JdA%YBM  
  DDX_Control(pDX, IDC_KEY, m_Key); hZtJ LY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (5h+b_eB  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ?4sF:Y+\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); eh /QFm 4  
  DDX_Text(pDX, IDC_PATH, m_Path); o 2_mcJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); m\eYm;R Vj  
 //}}AFX_DATA_MAP snvixbN  
} 94'0X  
s#>``E!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n-x%<j(Xf  
//{{AFX_MSG_MAP(CCaptureDlg) O Ce;8^  
 ON_WM_SYSCOMMAND() Uu(FFd~3  
 ON_WM_PAINT() JG*Lc@Q  
 ON_WM_QUERYDRAGICON() rssn'h  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {wCzm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dFzlcKFFD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) p -wEPC0  
//}}AFX_MSG_MAP |YWX.-aeo  
END_MESSAGE_MAP() eG08Xt |lc  
%dDwus  
BOOL CCaptureDlg::OnInitDialog() s\io9'Ec  
{ 57rH`UFXH  
 CDialog::OnInitDialog(); ]}A3Pm- t*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >Ni<itze$i  
 ASSERT(IDM_ABOUTBOX < 0xF000); g/BlTi  
 CMenu* pSysMenu = GetSystemMenu(FALSE); _28vf Bl?  
 if (pSysMenu != NULL) >*e,+ok  
 { woyeKOr  
  CString strAboutMenu; Hmv@7$9s\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~]C m  
  if (!strAboutMenu.IsEmpty()) *c' hmA s  
  { 3fhlMOm  
   pSysMenu->AppendMenu(MF_SEPARATOR); =plU3D2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v6*8CQ+  
  } BjAmM*k  
 } M'}iIO`L  
 SetIcon(m_hIcon, TRUE); // Set big icon 3}V -'!  
 SetIcon(m_hIcon, FALSE); // Set small icon cRS2v--\-  
 m_Key.SetCurSel(0); B^lm'/,@  
 RegisterHotkey(); [O\[,E"K  
 CMenu* pMenu=GetSystemMenu(FALSE); #7"*Pxb#A  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 65AG# O5R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D&nVkZP>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); K [M[0D  
 return TRUE; // return TRUE unless you set the focus to a control IrTMZG  
} f) @-X!  
oa:30@HSb  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?)mM]2%%  
{ ?n9?`8a#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) K-,8~8[  
 { a_amO<!   
  CAboutDlg dlgAbout; p}9bZKyf  
  dlgAbout.DoModal(); A i5|N  
 } h?+bW'm  
 else 9,>u,  
 { q<>aZ|r  
  CDialog::OnSysCommand(nID, lParam); h+d3JM  
 } >'e(|P4  
} kzXmiBL<9  
%2z] 2@  
void CCaptureDlg::OnPaint() 0zrZrl  
{ mrId`<L5l{  
 if (IsIconic()) 4pC.mRu 0  
 { &0*IN nlc?  
  CPaintDC dc(this); // device context for painting #azD& 6`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 61=D&lb  
  // Center icon in client rectangle 1k?k{Ri  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7<7 /NZ<I  
  int cyIcon = GetSystemMetrics(SM_CYICON); .7v .DR>  
  CRect rect; 2m0laJ3p9  
  GetClientRect(&rect); _7Rp.)[&  
  int x = (rect.Width() - cxIcon + 1) / 2; '/ v@q]!  
  int y = (rect.Height() - cyIcon + 1) / 2; <j^bk"l p  
  // Draw the icon  k.("<)  
  dc.DrawIcon(x, y, m_hIcon); q;L~5q."E  
 } &(t/4)IZox  
 else :$?^ID  
 { P8=!/L2?  
  CDialog::OnPaint(); /R!/)sg  
 } x9s1AzM{  
} M qG`P  
W*/0[|n*  
HCURSOR CCaptureDlg::OnQueryDragIcon() |)WN%#v  
{ 6im!v<1Qx  
 return (HCURSOR) m_hIcon; V detY\  
} C)8>_PY[M  
KOHYeiry~A  
void CCaptureDlg::OnCancel() Mz#<Vm4  
{ l-G] jXu  
 if(bTray) B`i 5lD  
  DeleteIcon(); Uth H  
  CDialog::OnCancel(); K6X}d,g  
} [d}AlG!  
%9lx)w  
void CCaptureDlg::OnAbout() Vp~c$y+  
{ OPP^n-iPr  
 CAboutDlg dlg; ic]b"ItD  
 dlg.DoModal(); @.SuHd  
} 1w/Ur'8we  
D`C#O 7.N  
void CCaptureDlg::OnBrowse() TE!+G\@  
{ PGaYYc3X  
 CString str; g7r_jj%ow  
 BROWSEINFO bi; 1Zj NRg=  
 char name[MAX_PATH]; cTQ]0<9:e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \WN ,.  
 bi.hwndOwner=GetSafeHwnd(); GoTJm}[N P  
 bi.pszDisplayName=name; :\<D q 71  
 bi.lpszTitle="Select folder"; r#;GVJR6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Obb"#W@3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); do>,ELS+m  
 if(idl==NULL) L/sMAB  
  return; QqU>V0y"w(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xJSK"  
 str.ReleaseBuffer(); sN%#e+(=  
 m_Path=str; *dw6>G0U  
 if(str.GetAt(str.GetLength()-1)!='\\') DLP G  
  m_Path+="\\"; KqNbIw*sR  
 UpdateData(FALSE); ]1k"'XG4,  
} jQIb :\0#  
?5e]^H}  
void CCaptureDlg::SaveBmp() ,9@JBV%_  
{ U'K{>"~1a  
 CDC dc; !CO1I-yL  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); HX&G  k  
 CBitmap bm; ~R!M.gY[rK  
 int Width=GetSystemMetrics(SM_CXSCREEN); y +2  
 int Height=GetSystemMetrics(SM_CYSCREEN); |{en) {:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FC BsC#  
 CDC tdc;  o<Z  
 tdc.CreateCompatibleDC(&dc); G!L(K  
 CBitmap*pOld=tdc.SelectObject(&bm); ^+'[:rE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ccPTJ/%$  
 tdc.SelectObject(pOld); ~aZy52H_#.  
 BITMAP btm; 8M,AFZ>F  
 bm.GetBitmap(&btm); ;p_@%*JAx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tW)K pX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 1;8%\r[|5^  
 BITMAPINFOHEADER bih; "xK#%eJjWd  
 bih.biBitCount=btm.bmBitsPixel; 6";ew:Ih^  
 bih.biClrImportant=0; q<Sb>M/\,  
 bih.biClrUsed=0; .4&pi  
 bih.biCompression=0; EpsjaOmAF  
 bih.biHeight=btm.bmHeight; DY(pU/q  
 bih.biPlanes=1; rT mVHt  
 bih.biSize=sizeof(BITMAPINFOHEADER); Wp2$L-T&$  
 bih.biSizeImage=size; #PJHwvr  
 bih.biWidth=btm.bmWidth; tP0\;W  
 bih.biXPelsPerMeter=0; E'ay @YAp  
 bih.biYPelsPerMeter=0; ;if PqL kO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N R0"yJV>  
 static int filecount=0; nd4Z5=X  
 CString name; fb*h.6^y9  
 name.Format("pict%04d.bmp",filecount++); *+|,rcI  
 name=m_Path+name; :H(wW   
 BITMAPFILEHEADER bfh; Q dPqcw4+X  
 bfh.bfReserved1=bfh.bfReserved2=0; H,q-*Kk  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;rqW?':(i  
 bfh.bfSize=54+size; 9m+ejTK{U  
 bfh.bfOffBits=54; dWK"Tkf\  
 CFile bf; e\7AtlW"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y:Ne}S*ncE  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  n)t'?7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uK;&L?WB  
  bf.WriteHuge(lpData,size); -2/&i  
  bf.Close(); ]H$Trf:L  
  nCount++; Svl; Ul  
 } =73aME}  
 GlobalFreePtr(lpData); h; "pAE  
 if(nCount==1) F +Dke>j  
  m_Number.Format("%d picture captured.",nCount); "PePiW(i+  
 else &rbkw<=j  
  m_Number.Format("%d pictures captured.",nCount); %5yP^BL0  
  UpdateData(FALSE); ;Zt N9l  
} fG_<HJS(~  
?l>Ra0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #9e2+5s  
{ T jrz_o)  
 if(pMsg -> message == WM_KEYDOWN) 3 n3$?oV  
 { Xf%vfAf  
  if(pMsg -> wParam == VK_ESCAPE) $No^\.mV  
   return TRUE; _fM=J+  
  if(pMsg -> wParam == VK_RETURN) yE_T#FN  
   return TRUE; UY}EW`$#m  
 } \TS.9 >\  
 return CDialog::PreTranslateMessage(pMsg); /)*si  
} 0 H0U%x8  
i*jnC>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Min {&?a  
{ I1 +A$<Fa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #\ l#f8(l  
  SaveBmp(); &\iMIJ-  
  return FALSE; C1w6[f1+  
} me YSW  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U_C[9Z'P  
 CMenu pop; O[j$n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H.]p\ UY9  
 CMenu*pMenu=pop.GetSubMenu(0); 044Q>Qz,  
 pMenu->SetDefaultItem(ID_EXITICON); :2*0Jh3_  
 CPoint pt; @>q4hYF  
 GetCursorPos(&pt); -,qGEJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FG5YZrONx  
 if(id==ID_EXITICON) $[U:Dk}  
  DeleteIcon(); Uo0[ZsFD  
 else if(id==ID_EXIT) =: =s  
  OnCancel(); iit 5IV  
 return FALSE; &~'^;hy=  
} P%y9fU2[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qoAJcr2uN  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RH^; M-'  
 AddIcon(); b>@fHmpwD  
 return res; R@ MXwP  
} vs2xx`Y<Lq  
,?c=v`e  
void CCaptureDlg::AddIcon() 4&<zkAMR  
{ *],= !  
 NOTIFYICONDATA data; 9/PX~j9O?  
 data.cbSize=sizeof(NOTIFYICONDATA); 30{+gYA  
 CString tip; S9E<)L  
 tip.LoadString(IDS_ICONTIP); p>1Klh:8.'  
 data.hIcon=GetIcon(0); |[iEi  
 data.hWnd=GetSafeHwnd(); *t bgIW+h  
 strcpy(data.szTip,tip); ZK`x(h{p)  
 data.uCallbackMessage=IDM_SHELL; L.x`Jpq(3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wpf  
 data.uID=98; `,s0^?_  
 Shell_NotifyIcon(NIM_ADD,&data); #&Fd16ov  
 ShowWindow(SW_HIDE); T~naAP  
 bTray=TRUE; :Tdl84   
} ,!bcm  
asL!@YE  
void CCaptureDlg::DeleteIcon() >a)6GZ@  
{ F>U*Wy  
 NOTIFYICONDATA data; 0IxHB|^$  
 data.cbSize=sizeof(NOTIFYICONDATA); 98Im/v  
 data.hWnd=GetSafeHwnd(); SD.c 9  
 data.uID=98; ]htx9ds=  
 Shell_NotifyIcon(NIM_DELETE,&data); \79aG3MyK  
 ShowWindow(SW_SHOW); BWLeitS/  
 SetForegroundWindow(); 7!A3PDAe  
 ShowWindow(SW_SHOWNORMAL); 6)1xjE#  
 bTray=FALSE; .#_g.0<  
} uz@lz +  
oR}'I  
void CCaptureDlg::OnChange() )AXa.y  
{ 2$O6%0  
 RegisterHotkey(); :9W)CwZ)V  
} W:1GY#Pe  
jF 6[+bW<  
BOOL CCaptureDlg::RegisterHotkey() :o_6  
{ ~-BIU Z;  
 UpdateData(); r1zuc:W 1  
 UCHAR mask=0; x?2y^3<5  
 UCHAR key=0; (P 9$Ei0fv  
 if(m_bControl) TB#oauJm,  
  mask|=4; p;rT#R&6>  
 if(m_bAlt) $Hal]  
  mask|=2; 24I~{Qy  
 if(m_bShift) yG:Pg MrB  
  mask|=1; "FXT8Qxg  
  key=Key_Table[m_Key.GetCurSel()]; '_%`0p1  
 if(bRegistered){ k7=mxXF  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3M[5_OK   
  bRegistered=FALSE; rlSflcK\\(  
 } |c:xK{Ik  
 cMask=mask; ~c|{PZ9U  
 cKey=key; AUwIF/>F(]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fHacVj J  
 return bRegistered; iYz!:TxP  
} p} i5z_tS  
aWMEo`O%  
  四、小结 3k* U/*  
FQw@ @  
  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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