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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: kn`KU.J.  
  `Z]a6@w~  
  一、实现方法 d<(1^Rto  
@wZ`;J%  
  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: JL2IVENWc  
@5Ril9J[b  
#pragma data_seg("shareddata") tCtR(mG=A  
HHOOK hHook =NULL; //钩子句柄 0xIr:aFF  
UINT nHookCount =0; //挂接的程序数目 E^#|1Kpq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U: gE:tf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Yca9G?^\v  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7Cp>iWV  
static int KeyCount =0; !W]># Pm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 G:A ~nv9  
#pragma data_seg() 8+v6%,K2  
{Kd9}CDAZ  
  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。 fx%'7/+  
^fXNeBj  
  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: HSp*lHU  
RE!MX>sOEq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H*EQ%BLW^,  
cKey,UCHAR cMask) DT n=WGm)  
{ %!p14c*J H  
 BOOL bAdded=FALSE; vy@;zrs  
 for(int index=0;index<MAX_KEY;index++){ ^yH|k@y  
  if(hCallWnd[index]==0){ u|BD%5+J  
   hCallWnd[index]=hWnd; o(C({]UO/  
   HotKey[index]=cKey; z=BX-)  
   HotKeyMask[index]=cMask; i LK8Wnrq  
   bAdded=TRUE; l yO_rZT  
   KeyCount++; J0mY=vX  
   break; w0^(jMQe^  
  } *G>V`||RW  
 } Qf7]t-Kp  
 return bAdded; <74q]C  
} =@gH$Q_1  
//删除热键 ?VS {,"X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wC'KI8-  
{ 2~Gcoda  
 BOOL bRemoved=FALSE; 8X5;)h   
 for(int index=0;index<MAX_KEY;index++){ dGP*bMCT  
  if(hCallWnd[index]==hWnd){ L.l%EcW=,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _BtppQIWv  
    hCallWnd[index]=NULL; {5^ 'u^E  
    HotKey[index]=0; HBo^8wN  
    HotKeyMask[index]=0; !+9H=u  
    bRemoved=TRUE; . I {X  
    KeyCount--; Ai(M06P:h  
    break; IP&En8W+  
   } >OZ+k(saL  
  } &Vvy`JE  
 } m5{Y  
 return bRemoved; Nz*qz"T  
} ;wJLH\/  
;7tOFsV  
Rj+}L ~"  
  DLL中的钩子函数如下: G*\wu&7!  
=h5&\4r=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $-M1<?5  
{ nU)}!` E  
 BOOL bProcessed=FALSE; NTs< ;ED  
 if(HC_ACTION==nCode) [)Xu60? Q  
 { pWbzBgM?nU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 iDp]l u  
   switch(wParam) zdU<]ge  
   {  "MM7qV  
    case VK_MENU: {nm#aA%,  
     MaskBits&=~ALTBIT; aE1h0`OT  
     break; yY[[)  
    case VK_CONTROL: nH NMoA  
     MaskBits&=~CTRLBIT; Ny\iRU)fN  
     break;  ItC*[  
    case VK_SHIFT: 57v[b-SK  
     MaskBits&=~SHIFTBIT; <4C`^p  
     break; `$G7Ia_ $]  
    default: //judge the key and send message XRJ<1w:  
     break; ;T-i+_  
   } o@EV>4e y  
   for(int index=0;index<MAX_KEY;index++){ "EWU:9\0  
    if(hCallWnd[index]==NULL) vb{&T<  
     continue; PPPRO.y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (<itE3P  
    { ]/JE#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [q9TTJ@2  
     bProcessed=TRUE; A6q,"BS^d  
    } f.V0uBDN  
   } qaG%PH}a  
  } P,_GTs3/G  
  else if((lParam&0xc000ffff)==1){ //有键按下 *)L%pH>`  
   switch(wParam) D@>P%k$$s>  
   { j%]i#iqF  
    case VK_MENU: s:jr/ j!  
     MaskBits|=ALTBIT; !i.`m-J*  
     break; 7bQ#M )}  
    case VK_CONTROL: V6BCW;   
     MaskBits|=CTRLBIT; j 7a;g7.  
     break; N#Qby4w >  
    case VK_SHIFT: , $78\B^  
     MaskBits|=SHIFTBIT; ^^3 >R`  
     break; i.0}qS?  
    default: //judge the key and send message h"#^0$f  
     break; 1p+2*c  
   } Vy-H3BR  
   for(int index=0;index<MAX_KEY;index++){ s@^GjA[6+  
    if(hCallWnd[index]==NULL)  J@(*(oQb  
     continue; xfos>|0N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  5t:4%  
    { pc^(@eD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Rj^bZ%t  
     bProcessed=TRUE; 75Jh(hd(  
    } rM=Q.By+\  
   } |+x;18  
  } H Tf7r-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  vRn^n  
   for(int index=0;index<MAX_KEY;index++){ r,[vXxMy(;  
    if(hCallWnd[index]==NULL) 0-l @U{  
     continue; uAK-%Uu?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6H.D `"cj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X<,sc;"b`k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 OHp 121  
   } ra_`NsKF}  
  } fVb&=%e  
 } g9GE0DbT`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~Jmn?9 3  
}  UZmz k  
py P5^Qv  
  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: !_l W#feR  
 ]c[80F-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'ZT E"KT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .~ZNlI {K  
aR*z5p2-w  
  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: Kdik7jL/J  
kp xd+w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )h2wwq0]  
{ _9\ ayR>d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QOy+T6en  
 { DH)@8)C  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 niqiDT/  
  SaveBmp(); D-E30b]e  
  return FALSE; _2}i8q:  
 } &wK%p/?  
 …… //其它处理及默认处理 -]W AB9  
} c<pr1g  
[M Z'i/  
IUbYw~f3  
  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。 !;zacw  
224I%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。 {j ${i  
t}_qtO7>  
  二、编程步骤 [KVBT;q6  
i7cMe8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; RUYw D tC  
.OX.z~":y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B~caHG1b  
|DwI%%0(F  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; oBifESJ  
NU I|4X  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; k3}ymhUf  
JV(|7Sk  
  5、 添加代码,编译运行程序。 Ol{)U;, `  
F2!_Z=  
三、程序代码 yZUB8erb.  
) i.p[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &AZr (>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <,HdX,5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ia0.I " ,  
#if _MSC_VER > 1000 FTtYzKX(bv  
#pragma once iW.8+?Xq&  
#endif // _MSC_VER > 1000 e@NS=U` <  
#ifndef __AFXWIN_H__ ZK{VQ~  
#error include 'stdafx.h' before including this file for PCH ;W'y^jp]"  
#endif B~jl1g|  
#include "resource.h" // main symbols E`u=$~K  
class CHookApp : public CWinApp a}hpcr({?  
{ J+Q ;'J  
 public: 2/E3~X7  
  CHookApp(); 5?kF'yksR  
  // Overrides @Zjy"u  
  // ClassWizard generated virtual function overrides UccnQZ7/I  
  //{{AFX_VIRTUAL(CHookApp) q 1Rk'k4+  
 public: ]wER&/v"  
  virtual BOOL InitInstance(); 8QXxRD;0:  
  virtual int ExitInstance(); UfOF's_'<  
  //}}AFX_VIRTUAL B9>3xxp(by  
  //{{AFX_MSG(CHookApp) z )a8 ^]`  
  // NOTE - the ClassWizard will add and remove member functions here. ]y2(ZTNTs  
  // DO NOT EDIT what you see in these blocks of generated code ! R1 hb-  
  //}}AFX_MSG 7t0\}e  
  DECLARE_MESSAGE_MAP() R1{ "  
}; sn}U4=u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -KCm#!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bo0m/hVU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j42U|CuK  
BOOL InitHotkey(); ) e;)9~  
BOOL UnInit(); z,X ^;  
#endif ^ :6v- Yx  
Yvs9)g  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. hz>&E,<8q  
#include "stdafx.h" _;G"{e.=  
#include "hook.h" & WYIfx{  
#include <windowsx.h> }f;Zx)!  
#ifdef _DEBUG esLPJx  
#define new DEBUG_NEW kzbgy)PK3  
#undef THIS_FILE q/XZb@rt  
static char THIS_FILE[] = __FILE__; %a{cJ6P  
#endif w`CGDF\Oo  
#define MAX_KEY 100 e7{3:y|]d3  
#define CTRLBIT 0x04 *jCXH<?R  
#define ALTBIT 0x02 ( T VzYm y  
#define SHIFTBIT 0x01 D?) "Z$  
#pragma data_seg("shareddata") %K\_gR}V  
HHOOK hHook =NULL; J 2v=b?NE  
UINT nHookCount =0; ,xn+T)2I  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey iRPt0?$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q|"{<2"]U0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cPPE8}PVH  
static int KeyCount =0; 13'tsM&  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kbI:}b7H  
#pragma data_seg() y9=/kFPRm  
HINSTANCE hins; QG4#E$ c  
void VerifyWindow(); _E{SGbCCi  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J&@[=zBYw  
//{{AFX_MSG_MAP(CHookApp) S5-}u)XnH  
// NOTE - the ClassWizard will add and remove mapping macros here. AVZ-g/<  
// DO NOT EDIT what you see in these blocks of generated code! _`+ !,kG[  
//}}AFX_MSG_MAP g%4-QCZ,  
END_MESSAGE_MAP() ;k9s@e#a  
]RML;]^  
CHookApp::CHookApp() _o8il3  
{ yLW iY~Fd  
 // TODO: add construction code here, Vx~[;*{,C9  
 // Place all significant initialization in InitInstance #?@k=e\  
} ZcYxH|Gn  
i jg'X#E  
CHookApp theApp; $83TA> <a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ']Nw{}eS`  
{ v< xe(dC  
 BOOL bProcessed=FALSE; j;=+5PY  
 if(HC_ACTION==nCode) MV-fDqA(  
 { 5$`i)}:s  
  if((lParam&0xc0000000)==0xc0000000){// Key up #6 e  
   switch(wParam) `|8)A)ZVT  
   { u#/Y<1gn  
    case VK_MENU: %F3M\)jU  
     MaskBits&=~ALTBIT; %A,4vLe~6  
     break; {-PD3 [f"  
    case VK_CONTROL: }mxy6m ,  
     MaskBits&=~CTRLBIT; 17a'C  
     break; KA0Ui,q3  
    case VK_SHIFT: w[^s) 1  
     MaskBits&=~SHIFTBIT; 1,p7Sl^h  
     break; |>gya&  
    default: //judge the key and send message ^+Ie   
     break; #VgPg5k.<  
   } Dr^#e  
   for(int index=0;index<MAX_KEY;index++){ +#"CgZ]  
    if(hCallWnd[index]==NULL) [;7&E{,C  
     continue; $A`D p{e"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xjt/ G):L  
    { =nh/w#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &y[Od{=  
     bProcessed=TRUE; j="{^b  
    } 1[ ME/r  
   } z:ue]7(.  
  } nr Jl>H  
  else if((lParam&0xc000ffff)==1){ //Key down 7 M=LyrO  
   switch(wParam) y[UTuFv~Q  
   { npkE [JE:  
    case VK_MENU: yEJ}!/  
     MaskBits|=ALTBIT; EEEYNu/4/  
     break; ^%@(> :)0  
    case VK_CONTROL: ZxlQyr`~a(  
     MaskBits|=CTRLBIT; f]tc$`vb  
     break; qt=gz6!  
    case VK_SHIFT: |2,u!{  
     MaskBits|=SHIFTBIT; 4GH?$p|LX  
     break; 8{Bcl5]<  
    default: //judge the key and send message Z!0D97^  
     break; @MWrUx  
   } 6 D_3Hwrs  
   for(int index=0;index<MAX_KEY;index++) c:.k2u  
   { 3fgVvt-2  
    if(hCallWnd[index]==NULL) P3jDx{F  
     continue; \{ r%.G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #eD@s En  
    {  )`!i"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y m<3  
     bProcessed=TRUE; HFu#-}iNV  
    } Cu3^de@h  
   } _5uzu6:y  
  } 56;lB$)"  
  if(!bProcessed){ Cb~_{$A  
   for(int index=0;index<MAX_KEY;index++){  /~yk  
    if(hCallWnd[index]==NULL) v@_b"w_TY  
     continue; p&/}0eL y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .>%(bH8S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S c_#BD.  
   } L=nyloz,0  
  } 6}ct{Q  
 } n dgG1v%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `h*)PitRa  
} |_@ '_  
#]>Z4=]v  
BOOL InitHotkey() Tp2`eY5  
{ ZT:&j4A|0  
 if(hHook!=NULL){ FGo{6'K(:  
  nHookCount++; U6;,<-bL  
  return TRUE; bx`s;r=  
 } <)ozbv Xk  
 else  3=@94i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Hy`Ee7>  
  if(hHook!=NULL)  u;R<  
   nHookCount++; 0l=g$G \%  
  return (hHook!=NULL); p0U4#dD6  
} ^vPM\qP#g  
BOOL UnInit() 9(g?{6v|  
{ &i179Qg!  
 if(nHookCount>1){ xs y5"  
  nHookCount--; &,/_"N"?D  
  return TRUE; #!(OTe L  
 } \yP\@cpY{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,) ^4H>~V  
 if(unhooked==TRUE){ OBp<A+a  
  nHookCount=0; D|lp3\`%  
  hHook=NULL; |giV<Sj  
 } 3@P 2]Q~D  
 return unhooked; xp<\7m_N  
} CBz$N)f  
<\l@`x96"D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OPH f9T3H  
{ oKjQ? 4  
 BOOL bAdded=FALSE; GY@(%^  
 for(int index=0;index<MAX_KEY;index++){ !8S $tk  
  if(hCallWnd[index]==0){ zXWf($^&E  
   hCallWnd[index]=hWnd;  0IO#h{t  
   HotKey[index]=cKey; OP>rEUtj  
   HotKeyMask[index]=cMask; 4d~Sn81xW  
   bAdded=TRUE; </~!5x62Oy  
   KeyCount++; &qKJN#NM@  
   break; V`Ve__5;  
  } !cS A|C  
 } C{AVV<  
 return bAdded; WfYu-TK *  
} *F7ksLH|q  
AG/?LPJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OE_;i}58  
{ |t](4  
 BOOL bRemoved=FALSE; /sVy"48-  
 for(int index=0;index<MAX_KEY;index++){ 1 XsB  
  if(hCallWnd[index]==hWnd){ 1Z-f@PoM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J<J_yRg2  
    hCallWnd[index]=NULL; !;EG<ji,gj  
    HotKey[index]=0; ], Xva`"  
    HotKeyMask[index]=0; 7J?`gl&C  
    bRemoved=TRUE; $KDH"J  
    KeyCount--; e lj]e  
    break; ^PHWUb+``  
   } >~C*m `#  
  } )r X["=  
 } $]O;D~  
 return bRemoved; }&|S8:   
} *Xm$w  
 {oQ.y  
void VerifyWindow() -:Up$6PR  
{ 7S+_eL^  
 for(int i=0;i<MAX_KEY;i++){ h:%L% Y9z  
  if(hCallWnd!=NULL){ Y)="of  
   if(!IsWindow(hCallWnd)){ U 8Rko)  
    hCallWnd=NULL; rq=D[vX\N(  
    HotKey=0; ?U3X,uv5J  
    HotKeyMask=0; ["]r=l  
    KeyCount--; ?}<4LK]  
   } ipy1tXc  
  } Qry?h*p+`  
 } Wl!|+-  
} ;#c=0*.  
'Bul_D4B  
BOOL CHookApp::InitInstance() Dxj&9Ra  
{ x%<oeM3U  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?&v+-4%4PI  
 hins=AfxGetInstanceHandle(); 0V:7pSC{P  
 InitHotkey(); NJ" d`  
 return CWinApp::InitInstance(); R Ptc \4  
} zg)-RCG  
v(PwE B]  
int CHookApp::ExitInstance() Z*,Nt6;e  
{ 'L$%)`;e  
 VerifyWindow(); GZt+(q  
 UnInit(); \jlem<&  
 return CWinApp::ExitInstance(); E"8cB]`|8  
} H<6TN^  
%p?+r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ean_/E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) yMz%s=rh  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f;";P  
#if _MSC_VER > 1000 2|Of$oMc  
#pragma once 3eOwy~  
#endif // _MSC_VER > 1000 UvwO/A\Gv  
hRKAs ]^j  
class CCaptureDlg : public CDialog ZcT%H*Ib]9  
{ jV:Krk6T<  
 // Construction c -1Hxd YD  
 public: Zp:(U3%  
  BOOL bTray; /F/zMZGSA{  
  BOOL bRegistered; T4H/D^X|  
  BOOL RegisterHotkey(); .aJ\^Fx  
  UCHAR cKey; J-Xw}|>@  
  UCHAR cMask; QPL6cU$&R  
  void DeleteIcon(); =}SH*xi6  
  void AddIcon(); 8HL$y-F  
  UINT nCount; i6)7)^nG  
  void SaveBmp(); .&|Ivz6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Id_?  
  // Dialog Data yWsJa)e3*@  
  //{{AFX_DATA(CCaptureDlg) uU+R,P0  
  enum { IDD = IDD_CAPTURE_DIALOG }; bU3e*Er  
  CComboBox m_Key; (~}P.?C8  
  BOOL m_bControl; G:u-C<^'  
  BOOL m_bAlt; AHg:`Wjv-  
  BOOL m_bShift; '!$g<= @  
  CString m_Path; d46PAA{'  
  CString m_Number; ,\t:R1.  
  //}}AFX_DATA 0Fd<@w Q0  
  // ClassWizard generated virtual function overrides *RPdU.  
  //{{AFX_VIRTUAL(CCaptureDlg) 5X8GR5P  
 public: Io8h 8N-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d#Hl3]wT  
 protected: kX0hRX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p_ H;|m9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vUlGE  
  //}}AFX_VIRTUAL PAYbsn  
  // Implementation "t[9EbFL  
 protected: >gQJ6q  
  HICON m_hIcon; }@+3QHwYU  
  // Generated message map functions N*vBu `  
  //{{AFX_MSG(CCaptureDlg) '{e9Vh<x  
  virtual BOOL OnInitDialog(); S!\4,6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^T^l3B[  
  afx_msg void OnPaint(); :K-05$K  
  afx_msg HCURSOR OnQueryDragIcon(); U/9i'D[|{  
  virtual void OnCancel(); "4`i]vy8  
  afx_msg void OnAbout(); 5" 5tY  
  afx_msg void OnBrowse(); "'# 18&N  
  afx_msg void OnChange(); osBwX.G'l  
 //}}AFX_MSG \w;d4r8x  
 DECLARE_MESSAGE_MAP() ;F)j,Ywi)H  
}; G&eRhif  
#endif LIm{Y`XU  
<FaF67[Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ](^$5Am  
#include "stdafx.h" H%`$@U>  
#include "Capture.h" 1R}rL#h;=  
#include "CaptureDlg.h" REEs}88);'  
#include <windowsx.h> FabDK :  
#pragma comment(lib,"hook.lib") {Kbb4%P+h  
#ifdef _DEBUG @y"/hh_?  
#define new DEBUG_NEW F_<n8U:Y  
#undef THIS_FILE H<Ne\zAv  
static char THIS_FILE[] = __FILE__; q?&Ap*  
#endif &oU) ,H  
#define IDM_SHELL WM_USER+1 B^;G3+}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "L?h@8sa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]npsclvJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .dbZ;`s  
class CAboutDlg : public CDialog %S'gDCwq  
{ 0.MD_s0)>  
 public: IjshxNk  
  CAboutDlg(); /b|V=j}W  
  // Dialog Data nM=5L:d  
  //{{AFX_DATA(CAboutDlg) pm)kocG  
  enum { IDD = IDD_ABOUTBOX }; Wqy\yS [  
  //}}AFX_DATA =sp5.-r  
  // ClassWizard generated virtual function overrides =hw&2c  
  //{{AFX_VIRTUAL(CAboutDlg) FrKI=8  
 protected: ZmXO3,sf)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t\\oG H  
  //}}AFX_VIRTUAL FZk=-.Hk  
  // Implementation <6!;mb ;cX  
 protected: 6k4ZzQ}  
  //{{AFX_MSG(CAboutDlg) >ocDh~@aP  
  //}}AFX_MSG 4Go$OQ`  
  DECLARE_MESSAGE_MAP() Ml"i^LR+  
}; z_;:6*l=:  
.eNeq C  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pW y+oZ  
{ tz6N,4J?  
 //{{AFX_DATA_INIT(CAboutDlg) tPQjjoh  
 //}}AFX_DATA_INIT ?o>JX.Nl&7  
} B'AU~#d  
XABB6J]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) goMv8d  
{ 0=:]tSD\F  
 CDialog::DoDataExchange(pDX); spX*e1  
 //{{AFX_DATA_MAP(CAboutDlg) .kl.awT  
 //}}AFX_DATA_MAP e >6NO  
} E"/r*C+T  
Ifx EM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t.s;dlx[@  
 //{{AFX_MSG_MAP(CAboutDlg) *v}3So  
 // No message handlers oe4r_EkYwW  
 //}}AFX_MSG_MAP #;+ABV  
END_MESSAGE_MAP() ;Xr|['\'  
u&E$(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :j<ij]rsI  
: CDialog(CCaptureDlg::IDD, pParent) Ic<J]+Xq  
{ D#.N)@\  
 //{{AFX_DATA_INIT(CCaptureDlg) |/YwMBi  
  m_bControl = FALSE; "p"M9P'  
  m_bAlt = FALSE; !gyEw1Re7  
  m_bShift = FALSE; ?=},%^  
  m_Path = _T("c:\\"); ~MpcVI_K  
  m_Number = _T("0 picture captured."); ?=FRn pU?  
  nCount=0; r@30y/C  
  bRegistered=FALSE; a,/wqX  
  bTray=FALSE; 'gaa@ !bg  
 //}}AFX_DATA_INIT 3}F{a8iIm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K(: _52rt  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^e~m`R2fHh  
} b}-/~l-:  
r8wip\[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) # o;\5MOE%  
{ (fTi1 I!  
 CDialog::DoDataExchange(pDX); p]]*H2UD  
 //{{AFX_DATA_MAP(CCaptureDlg) A8zh27[w%  
  DDX_Control(pDX, IDC_KEY, m_Key); N E/_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,zP.ch0K  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {0~xv@ U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); m"|AD/2;(  
  DDX_Text(pDX, IDC_PATH, m_Path); o3ZqPk]al  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e.>>al  
 //}}AFX_DATA_MAP ,|7!/]0&  
} gm1 7VrC  
N t-8[J  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !l7D1i~  
//{{AFX_MSG_MAP(CCaptureDlg)  %&81xAt  
 ON_WM_SYSCOMMAND() 8 Buus  
 ON_WM_PAINT() `,7;2ZG~O  
 ON_WM_QUERYDRAGICON() vNn$dc  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D|gI3i  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g,O3\jjQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) jTh^#Q  
//}}AFX_MSG_MAP g.:b\JE`  
END_MESSAGE_MAP() kw$*o k  
9^zA(  
BOOL CCaptureDlg::OnInitDialog() b]oPx8*'  
{ r.vezsH  
 CDialog::OnInitDialog(); * ak"}s  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d^:(-2l-  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?AlTQL~c  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a{y"vVQOF  
 if (pSysMenu != NULL) SmMJ%lgA6  
 { p+y2w{{  
  CString strAboutMenu; ixjhZki<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); FG{45/0We  
  if (!strAboutMenu.IsEmpty())  F<Y>  
  { "b6ew2\  
   pSysMenu->AppendMenu(MF_SEPARATOR); RLE6=#4  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (RM;T@`  
  } #^zUaPV 7r  
 }  x#hGJT  
 SetIcon(m_hIcon, TRUE); // Set big icon Y)](jU%o  
 SetIcon(m_hIcon, FALSE); // Set small icon 0XLoGQ=  
 m_Key.SetCurSel(0); rl0|)j  
 RegisterHotkey(); N NTUl$  
 CMenu* pMenu=GetSystemMenu(FALSE); 5n#@,V.O/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a'prlXr\4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (q+EP(Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); M!Wjfq ^~  
 return TRUE; // return TRUE unless you set the focus to a control a(|,KWHn  
} 92pl#Igt  
qCUn. mI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vbMt}bM(GD  
{ Dxx`<=&g  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bi<?m^j  
 { JXNfE,_  
  CAboutDlg dlgAbout;  #-^y9B  
  dlgAbout.DoModal(); l6y*SW5+  
 } c)Ep<W<r1  
 else .KX LWH  
 { ;z3w#fNMv  
  CDialog::OnSysCommand(nID, lParam); tEC`-> |  
 } ]*\m@lWu  
} p J#<e  
3A)Ec/;~  
void CCaptureDlg::OnPaint() j%TcW!D-_  
{ QBwgI>zfS"  
 if (IsIconic()) j{: >"6  
 { _N2tf/C&=  
  CPaintDC dc(this); // device context for painting -A3>+G3[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 0<4Sw j3s7  
  // Center icon in client rectangle snccDuS  
  int cxIcon = GetSystemMetrics(SM_CXICON); dZi ?Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); !tckE\ h#N  
  CRect rect; 1XD|H_JG<j  
  GetClientRect(&rect); TxDzGC  
  int x = (rect.Width() - cxIcon + 1) / 2; g0M9v]c  
  int y = (rect.Height() - cyIcon + 1) / 2; 5IfyD ]<  
  // Draw the icon tI;pdR]  
  dc.DrawIcon(x, y, m_hIcon); |`c=`xK7'  
 } n>##,o|Vr#  
 else NUjo5.7  
 { ~L3]Wa.  
  CDialog::OnPaint(); B 4my  
 } j?gsc Q3  
} Q4!6|%n8v  
S mjg[  
HCURSOR CCaptureDlg::OnQueryDragIcon() 48t_?2>  
{ =j$!N# L  
 return (HCURSOR) m_hIcon; %Tvy|L ,  
}  ET:B"  
!ZC0n`  
void CCaptureDlg::OnCancel() t w?\bB  
{ ")?NCun>  
 if(bTray) A"W}l)+X  
  DeleteIcon(); "JBTsQDj!  
  CDialog::OnCancel(); C?47v4n-'  
} 0{'%j~"  
X GhV? tA  
void CCaptureDlg::OnAbout() I6B4S"Q5<  
{ Rb=8(#  
 CAboutDlg dlg; n>["h2  
 dlg.DoModal(); @ApX43U(  
} SWZA`JVK  
-0R;C`(!  
void CCaptureDlg::OnBrowse() r@9qjva  
{ yccF#zU  
 CString str; \Tii S  
 BROWSEINFO bi; 4Bc<  
 char name[MAX_PATH]; B6hd*f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); n>-"\cjV  
 bi.hwndOwner=GetSafeHwnd(); ^+)q@{\8Y  
 bi.pszDisplayName=name; Gi*GFv%xB  
 bi.lpszTitle="Select folder"; wEp*j+Mmce  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; mE+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Pcox~U/j  
 if(idl==NULL) NIascee  
  return; fNllF,8}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .)Af&+KT  
 str.ReleaseBuffer(); g-cC&)0Q  
 m_Path=str; i rRe}  
 if(str.GetAt(str.GetLength()-1)!='\\') e9e7_QG_-  
  m_Path+="\\"; }?vVJm'  
 UpdateData(FALSE); 0*-nVC1  
} RxZ#`$F  
))z1T8  
void CCaptureDlg::SaveBmp() TA~YCj$  
{ &GetRDr  
 CDC dc; .gS x`|!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lAcXi$pF  
 CBitmap bm; R:}u(N  
 int Width=GetSystemMetrics(SM_CXSCREEN); f}_d`?K  
 int Height=GetSystemMetrics(SM_CYSCREEN); +&:?*(?Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); v!b 8_0~u6  
 CDC tdc; :(o6^%x  
 tdc.CreateCompatibleDC(&dc); oy?>e1Sy*  
 CBitmap*pOld=tdc.SelectObject(&bm); oF9c>^s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ./ !6M  
 tdc.SelectObject(pOld); _s> ZY0  
 BITMAP btm; %C^%Oq_k  
 bm.GetBitmap(&btm); /Wqx@#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; jj&4Sv#>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FID4@--  
 BITMAPINFOHEADER bih; |>2IgTh1a  
 bih.biBitCount=btm.bmBitsPixel; zLa3Q\T  
 bih.biClrImportant=0; [Q+qu>&HB7  
 bih.biClrUsed=0; RaNz)]+7`  
 bih.biCompression=0; O*d4zBT  
 bih.biHeight=btm.bmHeight; NX5A{  
 bih.biPlanes=1; d|, B* N(w  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~.,h12  
 bih.biSizeImage=size; G',*"mZQ[  
 bih.biWidth=btm.bmWidth; ZO!  
 bih.biXPelsPerMeter=0; ,*w  
 bih.biYPelsPerMeter=0; BL&D|e  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QlFt:?7f  
 static int filecount=0; H^e0fm  
 CString name; %}*0l8y  
 name.Format("pict%04d.bmp",filecount++); 6uAo0+-k  
 name=m_Path+name; 4\6-sL?rW  
 BITMAPFILEHEADER bfh; n!*uv~%$  
 bfh.bfReserved1=bfh.bfReserved2=0; Q4&|^RLLG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d'yA"b]  
 bfh.bfSize=54+size; X%>Sio  
 bfh.bfOffBits=54; ~^GY(J'  
 CFile bf; ?(!<m'jEy  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5r$ X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +z2+z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); x`#|8  
  bf.WriteHuge(lpData,size); Qf}^x9'  
  bf.Close(); (^Q:zU  
  nCount++; 3hrODts  
 } UOg4 E  
 GlobalFreePtr(lpData); >(t_  
 if(nCount==1) /0J1_g  
  m_Number.Format("%d picture captured.",nCount); DrTo")T  
 else XazKS4(  
  m_Number.Format("%d pictures captured.",nCount); ?5oeyBA@  
  UpdateData(FALSE); Q.8)_w  
} dK=<%)N  
# XD-a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d5x>kO'[l  
{ 'xC83}!k  
 if(pMsg -> message == WM_KEYDOWN) :gNTQZR  
 { {Va "o~io  
  if(pMsg -> wParam == VK_ESCAPE) $YyN-C  
   return TRUE; #''q :^EQ  
  if(pMsg -> wParam == VK_RETURN) rU {E}  
   return TRUE; CX8tTbuFl  
 } ~ }<!ON;  
 return CDialog::PreTranslateMessage(pMsg); ^.d97rSm  
} nsCat($)  
+cw;a]o^>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )/hb9+S  
{  ThLnp@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ < Y(lRM{  
  SaveBmp(); V|h/a\P  
  return FALSE; t1I` n(]n  
} +6xEz67A<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dUTF0U  
 CMenu pop; 06&:X^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); INyakAmJ}-  
 CMenu*pMenu=pop.GetSubMenu(0); e(^\0=u<  
 pMenu->SetDefaultItem(ID_EXITICON); '~1uJ0H  
 CPoint pt; Q6?}/p  
 GetCursorPos(&pt); vIoV(rc+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #\[((y:q  
 if(id==ID_EXITICON) [,F5GW{x  
  DeleteIcon(); r=" wd  
 else if(id==ID_EXIT) gGiLw5o,  
  OnCancel(); zLs[vg.(  
 return FALSE; -F+dRzxH  
} <V3N!H_d  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s57-<&@J9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -'tgr6=|w"  
 AddIcon(); bIP'(B#1K  
 return res; ZjE!? '(ef  
}  4I> I  
amL8yb  
void CCaptureDlg::AddIcon() WrR97]7t  
{ @+v;B:  
 NOTIFYICONDATA data; !~{AF|2f  
 data.cbSize=sizeof(NOTIFYICONDATA); .Jt&6N  
 CString tip; =Of!1TR(  
 tip.LoadString(IDS_ICONTIP); *N0R3da  
 data.hIcon=GetIcon(0); 1,p[4k~Ww  
 data.hWnd=GetSafeHwnd(); Fn8d;%C  
 strcpy(data.szTip,tip); );^] is~  
 data.uCallbackMessage=IDM_SHELL; GHMoT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; "G8w}n:y  
 data.uID=98; 8q6b3q:c  
 Shell_NotifyIcon(NIM_ADD,&data); .Q pqbp 8  
 ShowWindow(SW_HIDE); HqW|  
 bTray=TRUE; T5eXcI0t  
} Z7eD+4gD  
kpM5/=f/@  
void CCaptureDlg::DeleteIcon() 3q=A35*LT>  
{ w,\#)<boyb  
 NOTIFYICONDATA data; o,!r t1&0  
 data.cbSize=sizeof(NOTIFYICONDATA); b@OL !?JP  
 data.hWnd=GetSafeHwnd(); SnF3I  
 data.uID=98; lg0iNc!  
 Shell_NotifyIcon(NIM_DELETE,&data); C ^@~  
 ShowWindow(SW_SHOW); R~,*W1G6sF  
 SetForegroundWindow(); "RG.27  
 ShowWindow(SW_SHOWNORMAL); C(:tFuacpw  
 bTray=FALSE; 5-L?JD 4&  
} #L-3eW=f  
rNL*(PN}lO  
void CCaptureDlg::OnChange() Wmp,,H  
{ FDB^JH9d  
 RegisterHotkey(); 5Pis0fa  
} ]_S&8F}|  
=o5ZcC  
BOOL CCaptureDlg::RegisterHotkey() -Bqn^ E  
{ `}s$cgEG  
 UpdateData(); t@Qs&DZ7k  
 UCHAR mask=0; G[YbgG=9Y  
 UCHAR key=0; 1;p'2-x  
 if(m_bControl)  0u4:=Z}W  
  mask|=4; $1N_qu  
 if(m_bAlt) Hnwir!=7  
  mask|=2; %y~=+Sm%m  
 if(m_bShift) &Bbs\ ;  
  mask|=1; a G^kL  
  key=Key_Table[m_Key.GetCurSel()]; 54kd>)|"ag  
 if(bRegistered){ S6 F28 d[j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nn@"68]g  
  bRegistered=FALSE; N\IdZX%u  
 } )#9R()n!  
 cMask=mask; kfo, PrW`A  
 cKey=key; LI[ w?6B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y`QJcC(3  
 return bRegistered; A L#"j62  
} <_@ S@t)  
o$4n D#P3  
  四、小结 L Ty [)  
%,rUN+vW  
  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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