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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: ".dZn6"mI  
  BI j=!!  
  一、实现方法 P4Th_B7  
eznypY=  
  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: s{w[b\rA  
X=C1/4wU  
#pragma data_seg("shareddata") FEo269Ur  
HHOOK hHook =NULL; //钩子句柄 vF?5].T  
UINT nHookCount =0; //挂接的程序数目 .I@CS>j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 '<0J@^vZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +D1d=4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^GBe)~MT  
static int KeyCount =0; 4 QZ?}iz  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 w}{5#   
#pragma data_seg() N4*G{g  
D3c2^r $Z  
  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。 \u&_sBLKV  
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  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: IG3,XW  
$'pNp B#vH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &P,^.'  
cKey,UCHAR cMask) hd 0 'u  
{ MC&\bf  
 BOOL bAdded=FALSE; %okzOKKX  
 for(int index=0;index<MAX_KEY;index++){ CU7F5@+  
  if(hCallWnd[index]==0){ 6{qIU}!  
   hCallWnd[index]=hWnd; IHp_A  
   HotKey[index]=cKey; Ez{MU@Fk  
   HotKeyMask[index]=cMask; S60IPya  
   bAdded=TRUE; AfC>Q!-w  
   KeyCount++; GjB]KA^  
   break; f+.T^es  
  } rfw-^`&{  
 } *MI*Rz?4  
 return bAdded; y&_m 4Zw"  
} 4Z*U}w)  
//删除热键 r ]>\~&?^F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) na^sBq?\  
{ yFhB>i  
 BOOL bRemoved=FALSE; FecktD=  
 for(int index=0;index<MAX_KEY;index++){ >5G>D~b  
  if(hCallWnd[index]==hWnd){ ,_ag;pt9)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #Dfo#]k(  
    hCallWnd[index]=NULL; t4K~cK  
    HotKey[index]=0; ZX~ _g@  
    HotKeyMask[index]=0; T#Z%y!6  
    bRemoved=TRUE;  ,YhwpkL  
    KeyCount--; iK{T^vvk  
    break; 8e0."o.6  
   } $<p8TtI=YQ  
  } wve=.n  
 } [Vf}NF  
 return bRemoved; j8 C8X$  
} V^Rkt%JY  
V[a[i>,Z  
F~U!1)  
  DLL中的钩子函数如下: CVXytS?@x  
0uCT+-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^6p'YYj"5  
{ ?*r!{3T ,u  
 BOOL bProcessed=FALSE; l2hG$idC  
 if(HC_ACTION==nCode) H(Ms^8Vs~:  
 { @6o]chJo  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !MQ N  H  
   switch(wParam) -v?hqWMp#  
   {  j[6Raf/(n  
    case VK_MENU: NN 0Q`r,8}  
     MaskBits&=~ALTBIT; + E"[  
     break; uHNpfKnZ  
    case VK_CONTROL: 4 c'4*`I  
     MaskBits&=~CTRLBIT; 3kmeD".  
     break; AY_Q""v  
    case VK_SHIFT: w?csV8ot  
     MaskBits&=~SHIFTBIT; 59Sw+iZj  
     break; t^E hE  
    default: //judge the key and send message |dadH7  
     break; Gt/4F-Gn  
   } b~7drf  
   for(int index=0;index<MAX_KEY;index++){ }1+%_|Y-E  
    if(hCallWnd[index]==NULL) |)_-Bi;MW`  
     continue; U=Bn>F}y\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _|isa]u\ z  
    { h[XGC =%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xk~Nmb}  
     bProcessed=TRUE; ^&c$[~W  
    } O2-M1sd$  
   } L*?!Z^k  
  } \Mi#{0f+q  
  else if((lParam&0xc000ffff)==1){ //有键按下 7y*ZXT]f  
   switch(wParam) dYOF2si~%  
   { <rK=9"$y(t  
    case VK_MENU: -.vDF?@G  
     MaskBits|=ALTBIT; zXc}W*ymj  
     break; X`20f1c6q>  
    case VK_CONTROL: Fm j=  
     MaskBits|=CTRLBIT; 't>r sp+#  
     break; I^Qx/uTKw  
    case VK_SHIFT: OKwOugi0  
     MaskBits|=SHIFTBIT; )wf\F6jN  
     break; V"d=.Hb>  
    default: //judge the key and send message iH)Nk^   
     break; w4MwD?i]R  
   } ,9/5T:2  
   for(int index=0;index<MAX_KEY;index++){ >BqCkyM9Kf  
    if(hCallWnd[index]==NULL) @Y' I,e  
     continue; S6 }QFx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z}cIA87U  
    { &`:rp!Lc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @oH[SWx  
     bProcessed=TRUE; U|fTb0fB  
    } q9}2  
   } g_D-(J`IK,  
  } 2Ug.:![  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ?ei%RWo  
   for(int index=0;index<MAX_KEY;index++){ F ! )-|n}  
    if(hCallWnd[index]==NULL) jE U'.RBN%  
     continue; *)PG-$6X&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r<FQX3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -Z?Ck!00  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~ v1W  
   } R# 6H'TVE  
  } 29O]S8  
 } G\/IM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {,V$*  
} =WRO\lgv.  
A +!sD5d  
  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: k&DGJ5m$.  
h;n\*[fDc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L[]^{ O   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?Leyz  
]GS ~i+=M  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: }1rvM4{/+f  
jT"r$""1d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Dm4B  
{ a2 >[0_E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) j#o3  
 { &l!$Sw-u;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +wts 7,3  
  SaveBmp(); {h^c  
  return FALSE; Kfd_uXL>  
 } =L16hDk o  
 …… //其它处理及默认处理 y$h"ty{g  
} {jG.=}/Dk  
AgI>  
zn[QvY  
  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。 7%opzdS#  
>e_%M5 0  
  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。 O"QHb|j  
9i[4"&K  
  二、编程步骤 ,]U[W  
|<2 *v-a  
  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"; ioWJj.%  
GMT or  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; YME[%c2x  
uA^hCh-js  
  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; EJ8I[(  
o]p#%B?mZ  
  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; 6ZTaQPtm  
q'2`0MRa  
  5、 添加代码,编译运行程序。 (qj,GmcS  
Np)ho8zU  
三、程序代码 bu&;-Ynb  
T(&kXMaB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Y@ObwKcG  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SLg+H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 'Y ,1OK  
#if _MSC_VER > 1000 l JlZHO  
#pragma once \P5>{ 2i  
#endif // _MSC_VER > 1000 !+=Zjm4L  
#ifndef __AFXWIN_H__ {Wa~}1`Kl  
#error include 'stdafx.h' before including this file for PCH Q;Q%SI`yT  
#endif s`r-v/3l  
#include "resource.h" // main symbols ,y{0bq9*2  
class CHookApp : public CWinApp W?=$V>)  
{ ;Na^]32  
 public: zw,-.fmM#  
  CHookApp(); UDVf@[[hN  
  // Overrides PqVW'FYe  
  // ClassWizard generated virtual function overrides u7n[f@Eg,%  
  //{{AFX_VIRTUAL(CHookApp) q[Vi[b^F  
 public: p %L1uwLG  
  virtual BOOL InitInstance(); wy YtpW  
  virtual int ExitInstance(); 5cgo)/3M@}  
  //}}AFX_VIRTUAL !e&rVoA  
  //{{AFX_MSG(CHookApp) ](_{,P  
  // NOTE - the ClassWizard will add and remove member functions here. J"5jy$30'$  
  // DO NOT EDIT what you see in these blocks of generated code ! mF}c-  D  
  //}}AFX_MSG zuk"  
  DECLARE_MESSAGE_MAP()  gm(De9u  
}; (1rJFl!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =l_rAj~I|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6k:y$,w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sr;:Dvx~  
BOOL InitHotkey(); phr2X*Z/)Y  
BOOL UnInit(); 9LH=3Qt  
#endif UlnyTz~  
V@$GC$;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *X~B-a|nJ  
#include "stdafx.h" )@!~8<_"  
#include "hook.h" s fyBw  
#include <windowsx.h> /731.l  
#ifdef _DEBUG ]/LWrQD  
#define new DEBUG_NEW ,GP!fsK  
#undef THIS_FILE {,i=>%X*  
static char THIS_FILE[] = __FILE__; x)j/  
#endif 2H[=l Y  
#define MAX_KEY 100 V_Xy2<V  
#define CTRLBIT 0x04 $4DFgvy$  
#define ALTBIT 0x02 ;&If9O 1  
#define SHIFTBIT 0x01 {cmo^~[L$  
#pragma data_seg("shareddata") jo<>Hc{g>  
HHOOK hHook =NULL; tB GkRd!  
UINT nHookCount =0; (~=Qufy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XI]OA7Zis  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TG4\%S$w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey CKx\V+\O  
static int KeyCount =0; Rl y jOf{0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift NR ;q`Xe-  
#pragma data_seg() L& I` #  
HINSTANCE hins; =*{ K@p_  
void VerifyWindow(); >BJ2v=R A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `x2fp6  
//{{AFX_MSG_MAP(CHookApp) w/qQ(]n8  
// NOTE - the ClassWizard will add and remove mapping macros here. '&RZ3@}+  
// DO NOT EDIT what you see in these blocks of generated code! BXT 80a\  
//}}AFX_MSG_MAP tU9rCL:P  
END_MESSAGE_MAP() #x, ]D  
X QI.0L"  
CHookApp::CHookApp() L v  
{ 7J0 ^N7"o  
 // TODO: add construction code here, h |s*i  
 // Place all significant initialization in InitInstance v>JB rIb$  
} E^oEG4 X@  
bq c;.4$  
CHookApp theApp; gcX5Q^`a=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U,oD44  
{ A28ZSL  
 BOOL bProcessed=FALSE; F(T=WR].o  
 if(HC_ACTION==nCode) !JT< (I2  
 { `Mo~EHso.  
  if((lParam&0xc0000000)==0xc0000000){// Key up hp?ad  
   switch(wParam) B=Xnv*e  
   { p5lR-G  
    case VK_MENU: 2A dX)iF@  
     MaskBits&=~ALTBIT; 3m-edpH  
     break; :GN)7|:  
    case VK_CONTROL: h-z%C6  
     MaskBits&=~CTRLBIT; 9)G:::8u7  
     break; K?z*3^^X;  
    case VK_SHIFT: ?9o#%?6k  
     MaskBits&=~SHIFTBIT; OU0xZ=G  
     break; PiIp<fJd$  
    default: //judge the key and send message [,\'V0  
     break; <wIp$F.  
   } R*JOiVAC  
   for(int index=0;index<MAX_KEY;index++){ h#(.(d  
    if(hCallWnd[index]==NULL) f9h:"Dnzin  
     continue; ;cS~d(%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m _t(rn~f6  
    { 9Q SUCN_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ')5jllxv  
     bProcessed=TRUE;  y)N.LS  
    } S&4w`hdD>~  
   } ,Ut!u)  
  } '^P*F9  
  else if((lParam&0xc000ffff)==1){ //Key down Y\Fuj)  
   switch(wParam) kMwIuy  
   { 6E*Zj1KX  
    case VK_MENU: ,iA2s i  
     MaskBits|=ALTBIT; : L6-{9$  
     break; = y,yQO  
    case VK_CONTROL: _js2^<7v}  
     MaskBits|=CTRLBIT; ^c;skV&S  
     break; T }8r;<P6  
    case VK_SHIFT: ?kT~)k  
     MaskBits|=SHIFTBIT; '|dKg"Yl  
     break; ey9fbS ^I  
    default: //judge the key and send message e>)}_b  
     break; OTy 4"%  
   } zm_hLk  
   for(int index=0;index<MAX_KEY;index++) d~Z:$&r  
   { ~gzpX,{ n  
    if(hCallWnd[index]==NULL) Poylq] F  
     continue; egIS rmL+X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {~B4F}ES  
    { JydQA_   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5.+$v4  
     bProcessed=TRUE; x""Mxn]gD  
    } ?tal/uC  
   } )Or:wFSMq  
  } 6|(7G64{  
  if(!bProcessed){ 0ghwFo  
   for(int index=0;index<MAX_KEY;index++){ `5~o=g  
    if(hCallWnd[index]==NULL) H'0J1\ h  
     continue; ggYIq*4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \:f}X?:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A%sxMA!K,  
   } |'l* $  
  } |[n|=ORI'  
 } !gA^$(=:"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !Z9ikn4A  
} V.OoZGE>]  
hzf}_1  
BOOL InitHotkey() d T0 z^SG  
{ d+$[EDix  
 if(hHook!=NULL){ *b7 ^s,?  
  nHookCount++; fb S.  
  return TRUE; Lu$:,^ C  
 } B )3SiU  
 else fPuQ,J2=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Se]t;7j  
  if(hHook!=NULL) W3{5Do.h  
   nHookCount++; d ;Gm{g#  
  return (hHook!=NULL); a0v1LT6  
} ?2bE=|  
BOOL UnInit() t)kr/Z*p\  
{ 3 T#3<gqM[  
 if(nHookCount>1){ ;lPhSkD  
  nHookCount--; 7$!Bq#  
  return TRUE; tGy%n[ \  
 } Yv`1ySR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); C&MqUj"]  
 if(unhooked==TRUE){ hE3jb.s(>  
  nHookCount=0; J,2v~Dq  
  hHook=NULL; :r|P?;t(  
 } sC*E;7gT,  
 return unhooked; '1T v1  
} xVmUmftD  
L bK1CGyA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TbUkqABm  
{ Q?'W >^*J  
 BOOL bAdded=FALSE; Mh@ylp+q  
 for(int index=0;index<MAX_KEY;index++){ 0|3B8m  
  if(hCallWnd[index]==0){ r -DD*'R  
   hCallWnd[index]=hWnd; ~d1RD  
   HotKey[index]=cKey; ViC76aJ  
   HotKeyMask[index]=cMask; jI pcMN<  
   bAdded=TRUE; mgl' d  
   KeyCount++; |H I A[.q  
   break; \VzQ1B>k  
  } =:T:9Y_i  
 } Kof-;T  
 return bAdded; +/^q"/f F  
} 9#ay(g  
!{- 3:N7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $TUC?e9"h  
{ { l~T~3/i  
 BOOL bRemoved=FALSE; ry=[:\Z~  
 for(int index=0;index<MAX_KEY;index++){ `>HthK  
  if(hCallWnd[index]==hWnd){ (?=(eo<N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p~y 4q4  
    hCallWnd[index]=NULL; WxI]Fcb<  
    HotKey[index]=0; l%V}'6T  
    HotKeyMask[index]=0; m=b+V#4i(  
    bRemoved=TRUE; Jrrk$0H^~  
    KeyCount--; 2/NWWoKw  
    break; B,qZwc|  
   } V'#u_`x"D)  
  } 81 Not  
 } :)S4MoG  
 return bRemoved; R3 =E?us!  
} `9)2nkJk'z  
MZ[g|o!)v  
void VerifyWindow() jWjK-q@Y  
{ W_lNvzag  
 for(int i=0;i<MAX_KEY;i++){ gI$`d?[0{  
  if(hCallWnd!=NULL){ Cd*C^cJU&z  
   if(!IsWindow(hCallWnd)){ Q^;\!$:M  
    hCallWnd=NULL; {:+^[rer j  
    HotKey=0; ` R-np_  
    HotKeyMask=0; T"lqPbK  
    KeyCount--; 7E t(p'  
   } BNUf0;  
  } JVCgYY({KQ  
 } /R?uxhV  
} yr DYw T  
p 5w g+K  
BOOL CHookApp::InitInstance()  Ue Tp,  
{ >sY+Y22U  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); EnAw8Gm*  
 hins=AfxGetInstanceHandle(); gpl!Iz~5  
 InitHotkey(); rI$10R$+H  
 return CWinApp::InitInstance(); y$W3\`2q  
} `2+52q<FO  
f2XD^:Gc  
int CHookApp::ExitInstance() .;Yei6H  
{ ?NeB_<dLa`  
 VerifyWindow(); msJn;(Pn  
 UnInit(); bm|8Jbsb&  
 return CWinApp::ExitInstance(); RGOwm~a  
} %ua5T9H Z  
KL{ uhb0f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <FLc0s  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z k_&Kw|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g*9>z)  
#if _MSC_VER > 1000 ,\"gN5[$(  
#pragma once DSa92:M}  
#endif // _MSC_VER > 1000 cV,URUD  
KLB?GN?Pb  
class CCaptureDlg : public CDialog j R:Fih-}  
{ (.) s =  
 // Construction Nzt1JHRS  
 public: }x-8@9S~z  
  BOOL bTray; }3e+D  
  BOOL bRegistered; B 8,{jwB  
  BOOL RegisterHotkey(); n`1i k'x?  
  UCHAR cKey; M1\/ueOe  
  UCHAR cMask; OW^7aw(N6  
  void DeleteIcon(); <#Dc(VhT  
  void AddIcon();  }2"k:-g  
  UINT nCount; H|?`n uiD  
  void SaveBmp(); 5}VP-04vh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4G2V{(@QiZ  
  // Dialog Data sIe(;%[`  
  //{{AFX_DATA(CCaptureDlg)  su$juI{  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0>Nq$/!  
  CComboBox m_Key; irS62Xe  
  BOOL m_bControl; j=LF1dG"  
  BOOL m_bAlt; n9yxZu   
  BOOL m_bShift; .Dz /MSl  
  CString m_Path; YFY)Z7fK  
  CString m_Number; wXnt3)e  
  //}}AFX_DATA 1lM0pl6M  
  // ClassWizard generated virtual function overrides J %t1T]y~  
  //{{AFX_VIRTUAL(CCaptureDlg) d29HEu  
 public: Q)/q h;R u  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0v?,:]A0E  
 protected: TgLlmU*qMU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !ywc).]e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5;*C0m2%i  
  //}}AFX_VIRTUAL %K4-V5f  
  // Implementation pOXEM1"2A  
 protected: bB["Qd}Q  
  HICON m_hIcon; mdd~B2"el  
  // Generated message map functions `N0E;=g  
  //{{AFX_MSG(CCaptureDlg) Fu$otMw%l  
  virtual BOOL OnInitDialog(); O(VV-n7U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |qD<h  
  afx_msg void OnPaint(); * gnL0\*  
  afx_msg HCURSOR OnQueryDragIcon(); l;ugrAo?  
  virtual void OnCancel(); p#w,+)1!d  
  afx_msg void OnAbout(); &2DW  
  afx_msg void OnBrowse(); RXDk8)^  
  afx_msg void OnChange(); G[mYx[BTz  
 //}}AFX_MSG ^AN9m]P  
 DECLARE_MESSAGE_MAP() /[p4. FL  
}; AWzpk }\  
#endif Fpb1.Iz  
ROS0Q9X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W*0KAC`m  
#include "stdafx.h" !PgYn  
#include "Capture.h" c=5$bo]LI  
#include "CaptureDlg.h" Z-p_hNb  
#include <windowsx.h> n1ICW 9  
#pragma comment(lib,"hook.lib") 8[k-8h|  
#ifdef _DEBUG XxGm,A+>Ty  
#define new DEBUG_NEW @RC_Ie=#)  
#undef THIS_FILE {_Y\Y&#  
static char THIS_FILE[] = __FILE__; u=4Rn  
#endif Y<B| e91C  
#define IDM_SHELL WM_USER+1 IpWl;i`__  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q&vr;f B2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l"+=z.l6;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; l}m@9 ~oC  
class CAboutDlg : public CDialog {0|^F!1z  
{ ms?h/*E<H  
 public: f-Sb:O!V  
  CAboutDlg(); <rU(zm  
  // Dialog Data \Tc$P#  
  //{{AFX_DATA(CAboutDlg) -6? 5|\  
  enum { IDD = IDD_ABOUTBOX }; 8WAg{lVs  
  //}}AFX_DATA )3;S;b  
  // ClassWizard generated virtual function overrides milU,!7J  
  //{{AFX_VIRTUAL(CAboutDlg) js{ RaR=  
 protected: P6MT[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PKP( :3|  
  //}}AFX_VIRTUAL H*Yy o ?  
  // Implementation /h_BF\VBs  
 protected: H)5]K9D  
  //{{AFX_MSG(CAboutDlg)  8NLk`/  
  //}}AFX_MSG u~K4fP  
  DECLARE_MESSAGE_MAP() yPL@uCzA@  
}; 4FYws5]$  
?g!)[p`v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !nTq"d%(W  
{ @Fo0uy\ G  
 //{{AFX_DATA_INIT(CAboutDlg) 7y:J@fh<  
 //}}AFX_DATA_INIT RJ0w3T]7  
} #q%&,;4  
u|+O%s TQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .6r&<*  
{ _Ab|<!a/R  
 CDialog::DoDataExchange(pDX); =|H/[",gg  
 //{{AFX_DATA_MAP(CAboutDlg) `S%p D.g,2  
 //}}AFX_DATA_MAP d8av`m  
} =l {>-`:  
=>4,/g3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :Vv=p*~  
 //{{AFX_MSG_MAP(CAboutDlg) w* v%S   
 // No message handlers q$K^E  
 //}}AFX_MSG_MAP *vht</?J  
END_MESSAGE_MAP() #\fAp RL  
=YI<L8@g~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @dGj4h.  
: CDialog(CCaptureDlg::IDD, pParent) pm^[ve  
{ @zE_fL  
 //{{AFX_DATA_INIT(CCaptureDlg) h"j{B  
  m_bControl = FALSE; >*EcX3  
  m_bAlt = FALSE; Tf` ~=fg%  
  m_bShift = FALSE; wF}/7b54  
  m_Path = _T("c:\\"); 68d(6?OgW  
  m_Number = _T("0 picture captured."); gzxLHPiw  
  nCount=0; B|#"dhT  
  bRegistered=FALSE; 9^XT,2Wwf  
  bTray=FALSE; Y8(g8RN  
 //}}AFX_DATA_INIT @va6,^)  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #VtlXr>G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _.zW[;84b  
} F8.Fp[_tM  
K@6$|.bc  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) jf@#&%AC9  
{ n hS=t8H  
 CDialog::DoDataExchange(pDX); m%ak]rv([  
 //{{AFX_DATA_MAP(CCaptureDlg) CKyX  Z  
  DDX_Control(pDX, IDC_KEY, m_Key); S'lZ'H/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xrp%b1Sy  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .(`#q@73  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5_#wOz0u$  
  DDX_Text(pDX, IDC_PATH, m_Path); .(ki(8Z N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "2$C_aE  
 //}}AFX_DATA_MAP UJ2Tj+  
} t /1KKEZM  
eE+zL ~CE  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Syo1Dq6z.  
//{{AFX_MSG_MAP(CCaptureDlg) ,a_\o&V  
 ON_WM_SYSCOMMAND() fU8 &fo%ER  
 ON_WM_PAINT() N.l+9L0b  
 ON_WM_QUERYDRAGICON() [YLaR r  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n'K,*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) i.C+{QH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) MZv In ZS  
//}}AFX_MSG_MAP `a*[@a#  
END_MESSAGE_MAP() K]1A,Q  
lo5,E(7~h  
BOOL CCaptureDlg::OnInitDialog() q]DV49UK  
{ W c{<DE?J  
 CDialog::OnInitDialog(); 1.6yi];6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |L 11?{ K  
 ASSERT(IDM_ABOUTBOX < 0xF000); An{`'U(l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *0^!%Y'/4  
 if (pSysMenu != NULL) g ]e^;  
 { %4*-BCP  
  CString strAboutMenu; ;`p+Vs8C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Tu"bbc  
  if (!strAboutMenu.IsEmpty()) C4Z}WBS(  
  { kj{z;5-dl  
   pSysMenu->AppendMenu(MF_SEPARATOR); )"`(+Ku&c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N =FX3Z  
  } &`Oj<UyJY  
 } 6vAq&Y{JB'  
 SetIcon(m_hIcon, TRUE); // Set big icon j^-E,YMC  
 SetIcon(m_hIcon, FALSE); // Set small icon 1tw>C\  
 m_Key.SetCurSel(0); c6.S jV  
 RegisterHotkey(); ?%-VSL>$w=  
 CMenu* pMenu=GetSystemMenu(FALSE); ~)xg7\k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I]+xerVd  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7Ko<,Kp2b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZfsM($|a  
 return TRUE; // return TRUE unless you set the focus to a control @TBcVHy  
} C,r[H5G#  
/ Vy pN,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,j E'd'$  
{ -5B>2K F  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s\O4D*8  
 { ;n]GHqzY_  
  CAboutDlg dlgAbout; q#s:2#=  
  dlgAbout.DoModal(); je LRS8];  
 } w*#B_6bG  
 else 7~&  
 { W}jel}:  
  CDialog::OnSysCommand(nID, lParam); k@:M#?(F  
 } cBcfGNTJ~  
} +U9m  
sT8(f=^)8F  
void CCaptureDlg::OnPaint() JV_VF'  
{ -7-r~zmr  
 if (IsIconic()) T1$=0VSEa+  
 { 3lr9nBR  
  CPaintDC dc(this); // device context for painting .Z?@;2<l  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]rC2jB\,M  
  // Center icon in client rectangle _C"=Hy{  
  int cxIcon = GetSystemMetrics(SM_CXICON); (dvsGYT|.  
  int cyIcon = GetSystemMetrics(SM_CYICON); /Q]6"nY  
  CRect rect; ={g.Fn(_  
  GetClientRect(&rect); m{#?fR=9  
  int x = (rect.Width() - cxIcon + 1) / 2; -%f$$7  
  int y = (rect.Height() - cyIcon + 1) / 2; <e&88{jJ  
  // Draw the icon qe^d6  
  dc.DrawIcon(x, y, m_hIcon); M9~eDw'Pr  
 } U)v){g3w)  
 else SfTTB'9  
 { @kh:o\  
  CDialog::OnPaint(); 0c}pg:XT  
 } oz8z%*9 (  
} 1PGY/c  
x)}.@\&%  
HCURSOR CCaptureDlg::OnQueryDragIcon() mM#[XKOC<  
{ 1Jm'9iy3  
 return (HCURSOR) m_hIcon; vD-m FC)  
} bv:M zYS  
};{Qx  
void CCaptureDlg::OnCancel() J^w!?nk  
{ b;;mhu  
 if(bTray) Z-U-n/6I  
  DeleteIcon(); VsU*yG a  
  CDialog::OnCancel(); Ty&Ok*  
} 2K:Rrn/cR  
=# /BCL7  
void CCaptureDlg::OnAbout() Ot<vn34mt:  
{ {D{' \]+  
 CAboutDlg dlg; 3a Y^6&  
 dlg.DoModal(); D[H #W[  
} 5jNDr`pnu  
)lh Pl  
void CCaptureDlg::OnBrowse() DS| HN  
{ [,a2A  
 CString str; )JsmzGC0  
 BROWSEINFO bi; P->.eo#VG  
 char name[MAX_PATH]; E+"m@63  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ']&rPv kL  
 bi.hwndOwner=GetSafeHwnd(); fbrCl!%P  
 bi.pszDisplayName=name; q)f-z\  
 bi.lpszTitle="Select folder"; wZnv*t_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S_ER^Pkg  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (3VV(18  
 if(idl==NULL) # ? _8 *?  
  return; '$0~PH&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]jRaR~[UN  
 str.ReleaseBuffer(); *Dhy a g  
 m_Path=str; `JAM]qB"  
 if(str.GetAt(str.GetLength()-1)!='\\') o;"Phc.  
  m_Path+="\\"; y# iQ   
 UpdateData(FALSE); Q<O(Ix  
} AuIg=-xR  
78UE?) X"  
void CCaptureDlg::SaveBmp() kSUpEV+/  
{ igO,Ge8}  
 CDC dc; iXPe  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); SL$ bV2T  
 CBitmap bm; p:Hg>Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;) XB'  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3/s" ;Kg,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :~wU/dEEiz  
 CDC tdc; G?dxLRy.do  
 tdc.CreateCompatibleDC(&dc); ;_6 CV  
 CBitmap*pOld=tdc.SelectObject(&bm); a+=.(g  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); HP(dhsd<c  
 tdc.SelectObject(pOld); OzA'd\|  
 BITMAP btm; ,SG-{   
 bm.GetBitmap(&btm); zI{~;`tzN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L/KiE+Y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c`O(||UZT  
 BITMAPINFOHEADER bih; s ;2ih)[  
 bih.biBitCount=btm.bmBitsPixel; d1BE;9*/7  
 bih.biClrImportant=0; $I|6v  
 bih.biClrUsed=0; &xLCq&j 1  
 bih.biCompression=0; fP8iz `n  
 bih.biHeight=btm.bmHeight; [I 6&|Lz>  
 bih.biPlanes=1; ,GUOq!z  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;hb_jW-0W  
 bih.biSizeImage=size; uA;vW\fHr  
 bih.biWidth=btm.bmWidth; 73kU\ux  
 bih.biXPelsPerMeter=0; py }`thx  
 bih.biYPelsPerMeter=0; NbPNcjPL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); bw8[L;~%_  
 static int filecount=0; *bSxobn  
 CString name; @(W{_mw  
 name.Format("pict%04d.bmp",filecount++); "ph<V,lg  
 name=m_Path+name; W )jtTC7  
 BITMAPFILEHEADER bfh; wfQ^3HL  
 bfh.bfReserved1=bfh.bfReserved2=0; *O'`&J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -*[:3%  
 bfh.bfSize=54+size; EECuJ+T  
 bfh.bfOffBits=54; ;Q>+#5H6F8  
 CFile bf; i`^[_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KdXqW0nm  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #?C.%kD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0vZ49}mb)  
  bf.WriteHuge(lpData,size); !:wA\mAd  
  bf.Close(); gP.PyYUV  
  nCount++; |*( R$tX  
 } B'&QLO|  
 GlobalFreePtr(lpData); @p<tJR"M  
 if(nCount==1) 4o|<zn  
  m_Number.Format("%d picture captured.",nCount); 3|(<]@ $  
 else @!Rklhb  
  m_Number.Format("%d pictures captured.",nCount); -dS@ l'$  
  UpdateData(FALSE); ./35_Vy/O  
} *f o>  
3IG<Ot9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j;BlpRD}  
{ L*FQ`:lZ  
 if(pMsg -> message == WM_KEYDOWN) 0k G\9  
 { "\+.S]~  
  if(pMsg -> wParam == VK_ESCAPE) %J L P=(  
   return TRUE; ^Lv )){t  
  if(pMsg -> wParam == VK_RETURN) ,lcS J^yr  
   return TRUE; 5x"eM=  
 } z/,&w_8,:  
 return CDialog::PreTranslateMessage(pMsg); E NrcIZ  
} CE@[Z  
.: k6Kg  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _tRRIW"Vx"  
{ 8"}8Nrb0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8n35lI ( [  
  SaveBmp(); K\FLA_J  
  return FALSE; d7S?"JpV  
} *yv@B!r  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `|2g &Vn  
 CMenu pop; ERy=lP~gV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); HR ;I}J 9  
 CMenu*pMenu=pop.GetSubMenu(0); <$u\PJF7_^  
 pMenu->SetDefaultItem(ID_EXITICON); &z#`Qa3NI  
 CPoint pt; Mc&Fj1h5  
 GetCursorPos(&pt); qKrxln/T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )|/%]@` N  
 if(id==ID_EXITICON) !t+ 3DMPn  
  DeleteIcon(); ~owodc  
 else if(id==ID_EXIT) >Ptu-*  
  OnCancel(); ]h,iyWSs  
 return FALSE; L{rd',  
} &M:o(T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); k{H7+;_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S=j pn  
 AddIcon(); p-r[M5;-^Q  
 return res; 1m5*MY  
} 2;(+]Ad<  
"n_X4e+18P  
void CCaptureDlg::AddIcon() ^GlzKl   
{ loC~wm%Ql  
 NOTIFYICONDATA data; lQd7p+ 21  
 data.cbSize=sizeof(NOTIFYICONDATA); wh)F&@6 R!  
 CString tip; hI 9q);g  
 tip.LoadString(IDS_ICONTIP); |Sm/s;&c6  
 data.hIcon=GetIcon(0); Qj'Ik`o  
 data.hWnd=GetSafeHwnd(); A'.=SA2.Y  
 strcpy(data.szTip,tip); &B ]1 VZUp  
 data.uCallbackMessage=IDM_SHELL; MT7B'hd  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3I(;c ,S  
 data.uID=98; QYi4A "$`  
 Shell_NotifyIcon(NIM_ADD,&data); fY6~Z BvK  
 ShowWindow(SW_HIDE); AVm+ 1  
 bTray=TRUE; KK6n"&TVa  
} |-;VnC&UY  
)XHn.>]nc  
void CCaptureDlg::DeleteIcon() 2v2XU\u{t  
{ <# RVA{  
 NOTIFYICONDATA data; 'u E;8.,  
 data.cbSize=sizeof(NOTIFYICONDATA); i(_A;TT6  
 data.hWnd=GetSafeHwnd(); #f< v%  
 data.uID=98; [h8s0  
 Shell_NotifyIcon(NIM_DELETE,&data); TDUY&1[  
 ShowWindow(SW_SHOW); |-)8=QDz)r  
 SetForegroundWindow();  vP=68muD  
 ShowWindow(SW_SHOWNORMAL); V$sY3,J7A%  
 bTray=FALSE; +<j7^AEG  
} 0|J_'-<  
Q@7d:v  
void CCaptureDlg::OnChange() 1`YU9?  
{ H]pI$t3~  
 RegisterHotkey(); </WeB3#6  
} 'E+"N'M|  
vbVOWX6  
BOOL CCaptureDlg::RegisterHotkey() #c5jCy}n  
{ .] sJl  
 UpdateData(); jj1\oyQ8  
 UCHAR mask=0; tq}45{FH3  
 UCHAR key=0; m3TR}=n  
 if(m_bControl) ZZ7qSyBs?  
  mask|=4; IO:*F0  
 if(m_bAlt) ,wwO0,"y7  
  mask|=2; Rd&DH_<+^  
 if(m_bShift)  UXs)$  
  mask|=1; >WIc"y.  
  key=Key_Table[m_Key.GetCurSel()]; i=cST8!8N  
 if(bRegistered){ o87kF!x  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;Mup@)!j  
  bRegistered=FALSE; vWZXb `  
 } > .  
 cMask=mask; oojl"j4  
 cKey=key; \gk.[={^P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); tqZ+2c<W3  
 return bRegistered; viG,z4Zf  
} !: ^q_q4  
F5Z,Jmi^M  
  四、小结 6e%@uB}$  
u3C_Xz  
  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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