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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: }*eiG  
  W=b<"z]RE  
  一、实现方法 I#lvaoeN  
)Dn~e#  
  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: 4HX qRFUD  
@;>i3?  
#pragma data_seg("shareddata") F:$Dz?F0v  
HHOOK hHook =NULL; //钩子句柄 Ve/"9 ?Y_  
UINT nHookCount =0; //挂接的程序数目 dzA5l:5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 J6m`XC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 YA(_*h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Xxl>,QUA  
static int KeyCount =0; |GmV1hN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 aJh=4j~.  
#pragma data_seg() `D2wlyqO6  
-KzU''  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 t<`h(RczHI  
%y@iA91K  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: / D9FjOP  
iQ[0d.(A  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B_f0-nKP  
cKey,UCHAR cMask) c k~gB  
{ sy^k:y?  
 BOOL bAdded=FALSE; ZqI.n4:9  
 for(int index=0;index<MAX_KEY;index++){ ~&E|;\G  
  if(hCallWnd[index]==0){ >v4k_JX  
   hCallWnd[index]=hWnd; WA);Z=  
   HotKey[index]=cKey; 'WqSHb7  
   HotKeyMask[index]=cMask; ^iaeY jI  
   bAdded=TRUE; rWN#QL()*  
   KeyCount++; 9JF*xXd>Q  
   break;  KR  
  } ,v"/3Ff{,  
 } nMU#g])y)  
 return bAdded; V/j]UK0$  
} Z&mV1dxR  
//删除热键 ;O YwZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DSwF }  
{ qA- ya6  
 BOOL bRemoved=FALSE; l+'1>T.I  
 for(int index=0;index<MAX_KEY;index++){ h;vD"!gP  
  if(hCallWnd[index]==hWnd){ ht^U VV2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l<<G". ?  
    hCallWnd[index]=NULL; fgxsC7P$  
    HotKey[index]=0; :oB4\/(G#  
    HotKeyMask[index]=0; +n(H"I7cU  
    bRemoved=TRUE; H*QN/{|RU  
    KeyCount--; $,k SR}  
    break; <$liWAGX\  
   } (4V1%0  
  } ` n{rzenPX  
 } A>L(#lz#ek  
 return bRemoved; @C=, >+D  
} $"{V],:T |  
~H0~5v F  
f}4c#x  
  DLL中的钩子函数如下: [BhpfZNKRA  
tC+9W1o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DT&[W<oN  
{ Fga9  
 BOOL bProcessed=FALSE; 3w )S=4lB  
 if(HC_ACTION==nCode) -b@E@uAX /  
 { ^JtGT  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +!POKr  
   switch(wParam) I#l9  
   {  #},]`"n\  
    case VK_MENU: T GMHo{ ]  
     MaskBits&=~ALTBIT; kt1f2cj  
     break; :kZ2N67  
    case VK_CONTROL: KHr8\qLH  
     MaskBits&=~CTRLBIT; Ao96[2U6  
     break; v85&s  
    case VK_SHIFT: z!Kadqns  
     MaskBits&=~SHIFTBIT; .WL507*"Ce  
     break; mC~W/KReA  
    default: //judge the key and send message (I.uQP~H  
     break; @7lZ{jV$  
   } 8zj09T[  
   for(int index=0;index<MAX_KEY;index++){ @YwaOc_%  
    if(hCallWnd[index]==NULL) (u'/tNGS  
     continue; To%*)a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T)tHN#6I  
    { "gajBY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .x?zky^  
     bProcessed=TRUE; |P0L,R  
    } j5h 6u,^:  
   } M$4=q((0  
  } 5 -WRv;  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?7nr\g"g(  
   switch(wParam) oTD-+MZn  
   { $n#Bi.A j  
    case VK_MENU: [kuVQ$)  
     MaskBits|=ALTBIT; |*c\6 :  
     break; /sT ^lf=  
    case VK_CONTROL: #W%)$k c  
     MaskBits|=CTRLBIT;  c(V=.+J  
     break; 7Cd_zZ  
    case VK_SHIFT: Jg|cvu-+  
     MaskBits|=SHIFTBIT; z(` }:t  
     break; MYw8wwX0kJ  
    default: //judge the key and send message w0j/\XN 2s  
     break; W\qLZuQ  
   } o!toO&=  
   for(int index=0;index<MAX_KEY;index++){ 'uKkl(==%  
    if(hCallWnd[index]==NULL) BF@5&>E  
     continue; pPyvR;NJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m UWkb  
    { Yb%-tv:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9XoQO9*Q  
     bProcessed=TRUE; "\/^/vn?  
    } `e $n$Bh  
   } '{0[&i*  
  } Z<ajET`)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _+ twq i  
   for(int index=0;index<MAX_KEY;index++){ _i3i HR?  
    if(hCallWnd[index]==NULL) Ag0]U  
     continue; r^$\t0h(U8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fyI_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x*.Ye 5Jb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y4mC_4EU  
   } n6b3E *  
  } \bhOPK>w  
 } 8HMo.*Ti9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k$C"xg2  
} e:N7BZl'c9  
T yU&QXb  
  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: v&xKi>A il  
ZjqA30!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4d!S#zx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ]}Pl%.  
Oqpp=7  
  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: n`]l^qE  
_=ugxL #eB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Aj,]n>{  
{ osl=[pm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *|mz_cKu  
 { EYG"49 c  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3[VWTq)D=  
  SaveBmp(); 7Yuk  
  return FALSE; E *BSfn&i  
 } :/B:FY=  
 …… //其它处理及默认处理 ?cJY B)  
} @r F/]UJ  
VBM/x|'  
2B^~/T<\  
  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。 R2l[Q){!  
W6vf=I@f  
  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。 |H 8^  
0Q'v HZ"  
  二、编程步骤 r@iASITX  
W<v_2iVu  
  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"; I:i<>kG  
0/ !,Dn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; d"ZU y!a  
RV+E^pkp$  
  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; 0y~<%`~  
!^y y0`k6  
  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; UXH"si:  
\?Mf_  
  5、 添加代码,编译运行程序。 /(?@mnq_  
d-B7["z,  
三、程序代码 _w(ln9   
{Dr@HP/x=s  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL aDL*W@1S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ;AIc?Cg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ {v` 2sB  
#if _MSC_VER > 1000 T6M+|"92  
#pragma once 2(M6(xH>  
#endif // _MSC_VER > 1000 E4i0i!<z  
#ifndef __AFXWIN_H__ l! v!hUb+  
#error include 'stdafx.h' before including this file for PCH 1J}8sG2`  
#endif < g|Z}Y  
#include "resource.h" // main symbols Xsuwa-G!5~  
class CHookApp : public CWinApp wX,F`e3"/  
{ gSt`%  
 public: 5$rSEVg9  
  CHookApp(); 3y A2WW  
  // Overrides "D][e'  
  // ClassWizard generated virtual function overrides  Paj vb-f  
  //{{AFX_VIRTUAL(CHookApp) @=Fi7M  
 public: zj|WZ=1*Wp  
  virtual BOOL InitInstance(); jrMe G.e=D  
  virtual int ExitInstance(); wy,p&g)>  
  //}}AFX_VIRTUAL 6#e::GD  
  //{{AFX_MSG(CHookApp) #VVr"*7$  
  // NOTE - the ClassWizard will add and remove member functions here. atF?OP|{,w  
  // DO NOT EDIT what you see in these blocks of generated code ! q| .dez'  
  //}}AFX_MSG -JT/ 9IQ  
  DECLARE_MESSAGE_MAP() en*d/>OVJ  
}; beXNrf=bG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D y-S98Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )|bC^{kH!l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q{g;J`Z)p  
BOOL InitHotkey(); je/!{(  
BOOL UnInit(); .dMVoG5  
#endif _-TA{21)  
3< Od0J  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1.<q3q  
#include "stdafx.h" r|Z5Xc  
#include "hook.h" gJ$K\[+  
#include <windowsx.h> _aWl]I){5  
#ifdef _DEBUG >slm$~rv  
#define new DEBUG_NEW Px FWJ?=  
#undef THIS_FILE Q]/Uq~m C  
static char THIS_FILE[] = __FILE__; !p/%lU65  
#endif mTNB88p8^D  
#define MAX_KEY 100 RDqFL.-S  
#define CTRLBIT 0x04 +HT1ct+dI  
#define ALTBIT 0x02 <S75($  
#define SHIFTBIT 0x01 M=qb^~ l  
#pragma data_seg("shareddata") ~@ jY[_  
HHOOK hHook =NULL; pCh2SQ(Q>  
UINT nHookCount =0; q$(5Vd:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey #>=j79~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j^tW Iz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey XQ%4L-rhN  
static int KeyCount =0; w;UqEC V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XW{>-PBg:  
#pragma data_seg() fA/m1bYxg  
HINSTANCE hins; $$APgj"|<  
void VerifyWindow(); mrIh0B:`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) P O :"B6  
//{{AFX_MSG_MAP(CHookApp) @Jm7^;9/  
// NOTE - the ClassWizard will add and remove mapping macros here. X$%4$  
// DO NOT EDIT what you see in these blocks of generated code! L(T12s  
//}}AFX_MSG_MAP hpTDxh'?$C  
END_MESSAGE_MAP() {@! Kx`(:  
E%oY7.~-  
CHookApp::CHookApp() /sM~U q?  
{ l3Njq^T  
 // TODO: add construction code here, Q+4tIrd+  
 // Place all significant initialization in InitInstance nJ4pTOc  
} FR2= las"z  
fb8%~3i>  
CHookApp theApp; RrU BpqA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `w I/0  
{ su*Pk|6%  
 BOOL bProcessed=FALSE; ljl^ GFo  
 if(HC_ACTION==nCode) lj+u@Z<xA  
 { lL1k.& |5m  
  if((lParam&0xc0000000)==0xc0000000){// Key up .EM`.  
   switch(wParam) 9zYVC[o  
   { qC F5~;7  
    case VK_MENU: ^B8b%'\  
     MaskBits&=~ALTBIT; 'y8]_K*  
     break; )95f*wte  
    case VK_CONTROL: jw-0M1B  
     MaskBits&=~CTRLBIT; D %Xo&V[  
     break; =zQN[  
    case VK_SHIFT: {G?N E  
     MaskBits&=~SHIFTBIT; dOa%9[  
     break; LL:_L<  
    default: //judge the key and send message Ua!aaq&  
     break; D!7`CH+  
   } MEB it  
   for(int index=0;index<MAX_KEY;index++){ 6{ =\7AY  
    if(hCallWnd[index]==NULL) lNSLs"x^  
     continue; ~69&6C1Ch  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *z@>!8?  
    { sQkhwMg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H;RwO@v  
     bProcessed=TRUE; >2~=)L  
    } y5!KXAQ%  
   } / m=HG^!  
  } g+z1  
  else if((lParam&0xc000ffff)==1){ //Key down XI^QF;,  
   switch(wParam) !qG7V:6  
   { Jv^h\~*jH  
    case VK_MENU: ~3<> 3p  
     MaskBits|=ALTBIT; KCs[/]  
     break; !KUi\yQ1  
    case VK_CONTROL: )ut&@]  
     MaskBits|=CTRLBIT; !r<pmr3f@7  
     break; s0vDHkf8  
    case VK_SHIFT: .SWlp2!M5  
     MaskBits|=SHIFTBIT; {;2PL^i  
     break; n rjE.+v  
    default: //judge the key and send message ui?  
     break; @{2 5xTt  
   } \kZ?  
   for(int index=0;index<MAX_KEY;index++) Hl,W=2N  
   { \.-bZ$  
    if(hCallWnd[index]==NULL) }~L.qG  
     continue; [@.!~E)P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o2F)%TDY  
    { HAa; hb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [TmIVQ!B  
     bProcessed=TRUE; d$1@4r  
    } r8RoE`/T  
   } #pnI\  
  } p^w;kN  
  if(!bProcessed){ GB=X5<;  
   for(int index=0;index<MAX_KEY;index++){ ;>Ib^ov  
    if(hCallWnd[index]==NULL) r97pOs#5:  
     continue; H*PSR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T{-CkHf9Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Jcd-  
   } <<][hQs  
  } [<@.eH$hU/  
 } asppRL||  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K  &N  
} cQ R]le %(  
S4_YT@VD%  
BOOL InitHotkey() V2wb%;q  
{ u0 `S5?  
 if(hHook!=NULL){ QTk}h_<u  
  nHookCount++; n-tgX?1'  
  return TRUE; ?^al9D[:lz  
 } *XIF)Q=<>  
 else +nFu|qM}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *RJG!t*t  
  if(hHook!=NULL) gCB |DY  
   nHookCount++; Q+{xZ'o"Z  
  return (hHook!=NULL); ;DfY#-  
} g}1B;zGf  
BOOL UnInit() 12b(A+M   
{ MP Y[X[  
 if(nHookCount>1){ TNe l/   
  nHookCount--; ,is3&9  
  return TRUE; 6 ob@[ @  
 } ^@s1Z7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y!w`YYKP  
 if(unhooked==TRUE){ *&^Pj%DX  
  nHookCount=0; )Q&(f/LT  
  hHook=NULL; spH7 /5}  
 } 61C7.EZZ;  
 return unhooked; P~>O S5^  
} FrfM3x6UM  
o,\$ZxSlm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Tztu}t]N  
{ ;u_X)  
 BOOL bAdded=FALSE; @<hb6bo,N  
 for(int index=0;index<MAX_KEY;index++){ %S960  
  if(hCallWnd[index]==0){ [Kg+^N% +  
   hCallWnd[index]=hWnd; NvceYKp:  
   HotKey[index]=cKey; WUn]F~Lt  
   HotKeyMask[index]=cMask; C!<Ou6}!b  
   bAdded=TRUE; )4e.k$X^  
   KeyCount++; n,y ZRY  
   break; ]vUwG--*  
  } G:<aB  
 } 'x#~'v*  
 return bAdded; {I%cx Q#y  
} {H>gtpVy  
HAdg/3Hw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :%=Xm   
{ hR?{3d#x2  
 BOOL bRemoved=FALSE; hn G Z=  
 for(int index=0;index<MAX_KEY;index++){ me$Z~/Akm  
  if(hCallWnd[index]==hWnd){ lgL%u K)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e8a+2.!&\  
    hCallWnd[index]=NULL; sUO`uqZV  
    HotKey[index]=0; Q~ w|#  
    HotKeyMask[index]=0; W' VslZG  
    bRemoved=TRUE; L ca}J&x]^  
    KeyCount--; W:2( .?  
    break; Ty?cC**  
   } _1\v  
  }  +SU8 +w  
 } "%w u2%i  
 return bRemoved; Dw.J2>uj  
} e#8Q L  
Ynj,pl  
void VerifyWindow() S9y}  
{ U?Zq6_M&  
 for(int i=0;i<MAX_KEY;i++){ N:/D+L  
  if(hCallWnd!=NULL){ FDs>m #e  
   if(!IsWindow(hCallWnd)){ YK'<NE3 4  
    hCallWnd=NULL; +7.',@8_V  
    HotKey=0; Cl7xt}I  
    HotKeyMask=0; zTSTEOP}%Y  
    KeyCount--; IOmfF[  
   } ]w8(&,PP  
  } R__OP`!  
 } \Gvm9M  
} .Yn_*L+4*  
Bj;'qB>3  
BOOL CHookApp::InitInstance() 583|blL  
{ *.t 7G  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (hbyEQhF  
 hins=AfxGetInstanceHandle(); m-#2n? z-  
 InitHotkey(); $<EM+oJ|ER  
 return CWinApp::InitInstance(); sUQ@7sTj  
} hHnYtq  
!pX>!&sb  
int CHookApp::ExitInstance() '\iCP1>+S  
{ 0aB;p7~&  
 VerifyWindow(); W^l-Y %a/o  
 UnInit(); oap4rHk}  
 return CWinApp::ExitInstance(); j A%u 5V  
} fNFY$:4X  
"4{r6[dn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k{-Cwo  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (9dl(QSd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ysv" 6b}  
#if _MSC_VER > 1000 <Q3c[ Y  
#pragma once >4CbwwMA  
#endif // _MSC_VER > 1000 PEZ!n.'S  
|yPu!pfl  
class CCaptureDlg : public CDialog G"A#Q"  
{ nBYZ}L q  
 // Construction 8 FhdN  
 public: W@esITr  
  BOOL bTray; s#GLJl\E_P  
  BOOL bRegistered; .RL=xb|[  
  BOOL RegisterHotkey(); GA.8@3  
  UCHAR cKey; nr3==21Om4  
  UCHAR cMask; K)P%;X  
  void DeleteIcon(); .]K%G\*`:  
  void AddIcon(); A=>u 1h69  
  UINT nCount; *NQ/UXE  
  void SaveBmp(); ajpX L  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5IG-~jzCLb  
  // Dialog Data oL<St$1  
  //{{AFX_DATA(CCaptureDlg) yDh6KUK  
  enum { IDD = IDD_CAPTURE_DIALOG }; `0R./|bv\I  
  CComboBox m_Key;  AOx[  
  BOOL m_bControl; ##ANrG l  
  BOOL m_bAlt; ~QVH<`sn  
  BOOL m_bShift; ;n},"&  
  CString m_Path; :E?V.  
  CString m_Number; Qwc"[N4H  
  //}}AFX_DATA b`_Q8 J  
  // ClassWizard generated virtual function overrides WF"k[2  
  //{{AFX_VIRTUAL(CCaptureDlg) PI<vxjOK`  
 public: x)VJFuqy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rM "l@3hP  
 protected: 1:wQ.T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u=yOu^={  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L0]_X#s>#  
  //}}AFX_VIRTUAL jh$='Gn  
  // Implementation t g/H2p^Y  
 protected: mV m Gg,  
  HICON m_hIcon; C*lJrFpB  
  // Generated message map functions d!{r  v  
  //{{AFX_MSG(CCaptureDlg) /7LR;>Bj  
  virtual BOOL OnInitDialog(); <\FH fE  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U ;I9 bK8  
  afx_msg void OnPaint();  C.QO#b  
  afx_msg HCURSOR OnQueryDragIcon(); ^W@5TkkBQq  
  virtual void OnCancel(); aN=B]{!  
  afx_msg void OnAbout(); F<w/PMb  
  afx_msg void OnBrowse(); {^\r`V p  
  afx_msg void OnChange(); |Ds=)S" K  
 //}}AFX_MSG J. @9zA&  
 DECLARE_MESSAGE_MAP() )_NO4`ejs/  
}; h7I{ 4  
#endif Xm 2'6f,  
{}Za_(Y,]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b_):MQ1{  
#include "stdafx.h" 2Wb]4-  
#include "Capture.h"  rXU\  
#include "CaptureDlg.h" j8`BdKg  
#include <windowsx.h> :,I:usW"  
#pragma comment(lib,"hook.lib") !Rt>xD  
#ifdef _DEBUG V2G6Kw9gt  
#define new DEBUG_NEW ]$_NyAoBb  
#undef THIS_FILE kSh( u  
static char THIS_FILE[] = __FILE__; ?F;8Pa/  
#endif GM<-&s!Uj  
#define IDM_SHELL WM_USER+1 b%5f&N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e 3TI|e_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &8 x-o,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BVO<e \>3  
class CAboutDlg : public CDialog K96<M);:g  
{ (!N|Kl  
 public: JO< wU  
  CAboutDlg(); "w.3Q96r  
  // Dialog Data WeiFmar  
  //{{AFX_DATA(CAboutDlg) pV"R|{#V  
  enum { IDD = IDD_ABOUTBOX }; N8FF3}> g  
  //}}AFX_DATA @|%2f@h  
  // ClassWizard generated virtual function overrides '08=yqy4N  
  //{{AFX_VIRTUAL(CAboutDlg) I 2|Bg,e  
 protected: ^v`\x5"Vp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W{gb:^;zb  
  //}}AFX_VIRTUAL 6i~WcAs  
  // Implementation z]9MM 2+  
 protected: |H+Wed|  
  //{{AFX_MSG(CAboutDlg) UZsH9 o  
  //}}AFX_MSG IobD3:D8W  
  DECLARE_MESSAGE_MAP() :Z z '1C  
};  ][h}  
( ICd}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j,dR,Nd  
{ bbyg8;/  
 //{{AFX_DATA_INIT(CAboutDlg) hfy_3}_  
 //}}AFX_DATA_INIT "6?0h[uff  
} /~f'}]W  
NTI+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }~e%J(  
{ %-0t?/>  
 CDialog::DoDataExchange(pDX); ;BIY^6,7e  
 //{{AFX_DATA_MAP(CAboutDlg) .h4 \Y A  
 //}}AFX_DATA_MAP w: Kl6"c  
} q#=(e:aCb  
5N&?KA-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) J~UuS+Ufv  
 //{{AFX_MSG_MAP(CAboutDlg) Tyf`j,=  
 // No message handlers 7VFLJr t  
 //}}AFX_MSG_MAP YV anW  
END_MESSAGE_MAP() ITT@,  
~O &:C{9=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )/?$3h;  
: CDialog(CCaptureDlg::IDD, pParent) ?m? ::RH  
{ h'&%>Q2  
 //{{AFX_DATA_INIT(CCaptureDlg) 76h ,]xi  
  m_bControl = FALSE; =mp;.k95  
  m_bAlt = FALSE; zsyIV!(  
  m_bShift = FALSE; SmSH2m-  
  m_Path = _T("c:\\"); e [mm  
  m_Number = _T("0 picture captured."); 6.nCV 0xA  
  nCount=0; s{\8om '-  
  bRegistered=FALSE; )ea>%  
  bTray=FALSE; 8i#2d1O  
 //}}AFX_DATA_INIT {:$>t~=D  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f5VLw`m}.8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^N{h3b8  
} *]/zc1Q4M  
wHMX=N1/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CD ( :jM?  
{ iN8zo:&Z  
 CDialog::DoDataExchange(pDX); MXNFlP  
 //{{AFX_DATA_MAP(CCaptureDlg) uH- l%17  
  DDX_Control(pDX, IDC_KEY, m_Key); LR.<&m%~.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Fgh_9S9J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A1>OY^p3%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Oso#+  
  DDX_Text(pDX, IDC_PATH, m_Path); *@=/qkaJaI  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9c,'k#k  
 //}}AFX_DATA_MAP N.{H,oO `  
} Jgd'1'FOs  
++Ts  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) V_}"+&W9  
//{{AFX_MSG_MAP(CCaptureDlg) 9} M?P  
 ON_WM_SYSCOMMAND() ?:I*8Fj  
 ON_WM_PAINT() hVAn>_(  
 ON_WM_QUERYDRAGICON() NzOx0WLF  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =BAW[%1b  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ryUQU^v  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Z!zF\<r  
//}}AFX_MSG_MAP 3/e.38m|  
END_MESSAGE_MAP() r 8rgY42  
J({Xg?  
BOOL CCaptureDlg::OnInitDialog() vJc-6EO  
{ T9_RBy;%  
 CDialog::OnInitDialog(); >T3-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MSqVlj  
 ASSERT(IDM_ABOUTBOX < 0xF000); q"sed]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -g Sa_8R  
 if (pSysMenu != NULL) }1i`6`y1  
 { gANuBWh8T  
  CString strAboutMenu; Rmt~,cW!\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); e95Lo+:f  
  if (!strAboutMenu.IsEmpty()) O-GJ-  
  { &LZn FR  
   pSysMenu->AppendMenu(MF_SEPARATOR); /saIs%(fU  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); as4;:  
  } dx{bB%?Y\=  
 } u^bidd6JRn  
 SetIcon(m_hIcon, TRUE); // Set big icon (G4at2YLd  
 SetIcon(m_hIcon, FALSE); // Set small icon Jg\zdi:t  
 m_Key.SetCurSel(0); j0S# >t  
 RegisterHotkey(); )SRefW.v  
 CMenu* pMenu=GetSystemMenu(FALSE); QP8Ei~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); L<-_1!wh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )<;Y-u.UW  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Fk*7;OuZl  
 return TRUE; // return TRUE unless you set the focus to a control a /l)qB#  
} 0s3%Kqi[  
l%puHZ)t  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %D}kD6=  
{ aweV#j(y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FR4QUk  
 { }`QUHIF  
  CAboutDlg dlgAbout; wb5baY9  
  dlgAbout.DoModal(); tip+q d  
 } fg!__Rdi  
 else zrL$]Oy}x  
 { )c83/= <v  
  CDialog::OnSysCommand(nID, lParam); foF({4q7b^  
 } %.Fi4}+O  
} q?oP?cCw  
w QH<gJE/:  
void CCaptureDlg::OnPaint() (*nT(Adk  
{ [.'|_l  
 if (IsIconic()) y'~U%,ki6  
 { +]A:M6P:{v  
  CPaintDC dc(this); // device context for painting ]&xk30  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZaDyg"Tw+  
  // Center icon in client rectangle T/Gz94c  
  int cxIcon = GetSystemMetrics(SM_CXICON); THbh%)Zv+  
  int cyIcon = GetSystemMetrics(SM_CYICON); qL&[K>2z  
  CRect rect; V>)OpvoT#  
  GetClientRect(&rect); t?ZI".>  
  int x = (rect.Width() - cxIcon + 1) / 2; +xSHL|:b  
  int y = (rect.Height() - cyIcon + 1) / 2; ^aMg/.j  
  // Draw the icon  ZrxD`1L  
  dc.DrawIcon(x, y, m_hIcon); _AYK435>N  
 } o\<ULW*  
 else *@r/5pM2}  
 { }bpQq6ZF  
  CDialog::OnPaint(); +L| ?~p`V  
 } /y#f3r+*2  
} [f-?y mmT  
mpEK (p  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0r] t`{H  
{ }6}l7x  
 return (HCURSOR) m_hIcon; E7 Ul;d  
} 3cyHfpx-W  
p8H'{f\G  
void CCaptureDlg::OnCancel() .fFCC`&T  
{ A*R^n}sh  
 if(bTray) b8VTo lJ  
  DeleteIcon(); "a>q`RaIQ"  
  CDialog::OnCancel(); 5 +YH.4R  
} ]^n7  
nQtWvT  
void CCaptureDlg::OnAbout() R'`qKc  
{ z'U1bMg  
 CAboutDlg dlg; 3{^9]7UC  
 dlg.DoModal(); <X^@*79m  
} mh{d8<Q2  
$Sx'sA2  
void CCaptureDlg::OnBrowse() R)( T^V`{  
{ :WS@=sZN  
 CString str; B =T'5&  
 BROWSEINFO bi; nH'e?>x~e  
 char name[MAX_PATH]; Z1f8/?`W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,RI Gc US  
 bi.hwndOwner=GetSafeHwnd(); Y>T-af49  
 bi.pszDisplayName=name; o.g V4%  
 bi.lpszTitle="Select folder"; \?ZB]*Fu  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; sA/D]W.P  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "]x'PI 4J  
 if(idl==NULL) Y%aCMP9j~9  
  return; PfD.:amN7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~i{(<.he  
 str.ReleaseBuffer(); >d*@_ kJM  
 m_Path=str; !bx;Ta.  
 if(str.GetAt(str.GetLength()-1)!='\\') e8!5 I,I  
  m_Path+="\\"; 8oseYH  
 UpdateData(FALSE); rjAn@!|:+  
} r:'.nhe  
t?&|8SId  
void CCaptureDlg::SaveBmp() \ gGW8Q;  
{ Z'W =\rl  
 CDC dc; KVaiugQ   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); VG#EdIiI  
 CBitmap bm; vjCu4+w($Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); aQcleTb  
 int Height=GetSystemMetrics(SM_CYSCREEN); $am$ EU?s  
 bm.CreateCompatibleBitmap(&dc,Width,Height); t!X. |`h  
 CDC tdc; :zbQD8jv  
 tdc.CreateCompatibleDC(&dc); Hqx-~hQO  
 CBitmap*pOld=tdc.SelectObject(&bm); 7~ p@0)''  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b<ZIWfs  
 tdc.SelectObject(pOld); PO^ij2eS  
 BITMAP btm; B eo@K|3GN  
 bm.GetBitmap(&btm); J#(LlCs?@c  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j#x6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); RFcv^Xf  
 BITMAPINFOHEADER bih; )}(^, Fo c  
 bih.biBitCount=btm.bmBitsPixel; |O+H[;TB6  
 bih.biClrImportant=0; ) 7@ `ut  
 bih.biClrUsed=0; .bg~>T+<  
 bih.biCompression=0; \fd v]f  
 bih.biHeight=btm.bmHeight; 6OIte -c  
 bih.biPlanes=1; eA?RK.e  
 bih.biSize=sizeof(BITMAPINFOHEADER); I)[DTCJ~  
 bih.biSizeImage=size; aCj&O:]=  
 bih.biWidth=btm.bmWidth; :#ik. D  
 bih.biXPelsPerMeter=0; ^|>PA:%  
 bih.biYPelsPerMeter=0; n\D&!y[]F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vX"*4m>b?+  
 static int filecount=0; ~<5!?6Yt  
 CString name; "| g>'wM*  
 name.Format("pict%04d.bmp",filecount++); @%uUiP0  
 name=m_Path+name; @ioJ] $o7  
 BITMAPFILEHEADER bfh; [5b--O  
 bfh.bfReserved1=bfh.bfReserved2=0; a0E)2vt4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j0aXyLNX  
 bfh.bfSize=54+size; k5e;fA/w  
 bfh.bfOffBits=54; 50wulGJud  
 CFile bf; ]7BvvQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ iC~^)-~H=w  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9T9!kb  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5 PJhEB  
  bf.WriteHuge(lpData,size); 3M7/?TMw{6  
  bf.Close(); i$#;Kpb`^  
  nCount++; R| , g<  
 } ((;!<5-`s  
 GlobalFreePtr(lpData); HM1Fz\Sf  
 if(nCount==1) j2[+z tG  
  m_Number.Format("%d picture captured.",nCount); -3 *]G^y2  
 else & h)yro  
  m_Number.Format("%d pictures captured.",nCount); ..5CC;B  
  UpdateData(FALSE); u4?L 67x  
} 5Ln,{vsv  
1n8/r}q'H  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9;u@q%;!k  
{ Iyn(?w  
 if(pMsg -> message == WM_KEYDOWN) -d/ =5yxL  
 { T3<4B!UB&  
  if(pMsg -> wParam == VK_ESCAPE) .`H5cuF`  
   return TRUE; & J'idYD  
  if(pMsg -> wParam == VK_RETURN) }R2u@%n{  
   return TRUE; JPHL#sKyz  
 } T&bY a`f]  
 return CDialog::PreTranslateMessage(pMsg); \*?~Yj #  
} EME|k{W  
JXQO~zj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Hvi49c]]  
{ *N<]Xy @  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eo?bL$A[s  
  SaveBmp(); oZgjQM$YP  
  return FALSE; H%td hu\e  
} ?l{nk5,?-Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $a]`nLUa  
 CMenu pop; ;$|nrwhy  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F)QDJE0  
 CMenu*pMenu=pop.GetSubMenu(0); q<|AZ2Ai  
 pMenu->SetDefaultItem(ID_EXITICON); =UQ3HQD  
 CPoint pt; 0s[Hkhls  
 GetCursorPos(&pt); YD6'#(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &p@O _0nF  
 if(id==ID_EXITICON) Yj49t_$b  
  DeleteIcon(); p6V0`5@t  
 else if(id==ID_EXIT) cm+Es6;  
  OnCancel(); H7n>Vx:L-  
 return FALSE; n-;`Cy`k  
} #;e:A8IQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gwMNYMI  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S=5o < 1  
 AddIcon(); v!5 `|\  
 return res; I\ob7X'Xu!  
} 73;GW4,  
chX"O 0?"  
void CCaptureDlg::AddIcon() T0)@pt7>  
{ 0GeTS Fj  
 NOTIFYICONDATA data; ZFL~;_r  
 data.cbSize=sizeof(NOTIFYICONDATA); (\x]YMLH  
 CString tip; ;e*!S}C,  
 tip.LoadString(IDS_ICONTIP); 5 7c8xk[.2  
 data.hIcon=GetIcon(0); n:!_  
 data.hWnd=GetSafeHwnd(); O\ r0bUPE  
 strcpy(data.szTip,tip); ?e 4/p  
 data.uCallbackMessage=IDM_SHELL; xy;;zOh`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5$k:t  
 data.uID=98; a:w#s}bL  
 Shell_NotifyIcon(NIM_ADD,&data); %.|@]!C  
 ShowWindow(SW_HIDE); KZf+MSq? B  
 bTray=TRUE; gPPkT"  
}  @q) d  
(4nq>;$3  
void CCaptureDlg::DeleteIcon() D&y7-/  
{ WpvhTX  
 NOTIFYICONDATA data; S f# R0SA  
 data.cbSize=sizeof(NOTIFYICONDATA); i83OOV$1J  
 data.hWnd=GetSafeHwnd(); 9pfIzs su3  
 data.uID=98; ~P-mC@C  
 Shell_NotifyIcon(NIM_DELETE,&data); dR]m8mdqc1  
 ShowWindow(SW_SHOW); OjA,]Gv6  
 SetForegroundWindow(); xAm6BB c  
 ShowWindow(SW_SHOWNORMAL); @6-jgw>W2  
 bTray=FALSE; [$UI8tV  
} }Q+|W=2t  
A04U /;  
void CCaptureDlg::OnChange() _+MJ%'>S  
{ {)<v&'*c~  
 RegisterHotkey(); Y'X%Aw;`  
} J'r^/  
^-'fW7[m  
BOOL CCaptureDlg::RegisterHotkey() Tid aa  
{ u*9V&>o  
 UpdateData(); Xch~ 1K  
 UCHAR mask=0; 6Kz,{F@  
 UCHAR key=0; N'=gep0V@  
 if(m_bControl) LDa1X2N  
  mask|=4; \_fv7Fdp{  
 if(m_bAlt) mX|ojZ  
  mask|=2; q@2siI~W  
 if(m_bShift) /Z4et'Lo  
  mask|=1; 3G4-^hY<  
  key=Key_Table[m_Key.GetCurSel()]; sDV Q#}a  
 if(bRegistered){ Etm?'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); bg0Wnl  
  bRegistered=FALSE; vZ Lf  
 } wz8yD8M  
 cMask=mask; }ad|g6i`  
 cKey=key; RG`1en  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;A[Q2(w+  
 return bRegistered; IE~ |iQ?-  
} :BT q!>s  
;A!BVq  
  四、小结 ete.!*=  
cCc( fF*^  
  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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