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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: JJr<cZ4]  
  *{bqHMd4L  
  一、实现方法 7dRU7p>  
uq_SF.a'v  
  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: "k/x+%!Spc  
nNr3'6lz  
#pragma data_seg("shareddata") BH1To&ol  
HHOOK hHook =NULL; //钩子句柄 aJ ts  
UINT nHookCount =0; //挂接的程序数目 >#Y q&@G  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Bf.RYLsh6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 xYq8\9Qb  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :A[/;|&  
static int KeyCount =0; H#:Yw|t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 70Am]L&M  
#pragma data_seg() 9v A`\\9  
4+0Zj+ q";  
  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。 62q-7nV  
}9JPSl28Jr  
  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: }HzZj;O^2>  
a &j?"o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 'AoH2 |  
cKey,UCHAR cMask) >=(e}~5y  
{ ~kga+H  
 BOOL bAdded=FALSE; = zSrre  
 for(int index=0;index<MAX_KEY;index++){ hV%l}6yS&  
  if(hCallWnd[index]==0){ _<$=n6#  
   hCallWnd[index]=hWnd; hG U &C]  
   HotKey[index]=cKey; ~*qGH  
   HotKeyMask[index]=cMask; E*$:~w  
   bAdded=TRUE; spf}{o  
   KeyCount++; R.7" ZG  
   break; <5 +?&i  
  } {>qCZ#E5WO  
 } POf \l  
 return bAdded; YZ}gZQ.A0  
} /\.kH62  
//删除热键 Jq->DzSmj/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w K+2;*bI  
{ =W6P>r_  
 BOOL bRemoved=FALSE; ME(!xI//JZ  
 for(int index=0;index<MAX_KEY;index++){ fHiCuF  
  if(hCallWnd[index]==hWnd){ VmW_,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b({2|R  
    hCallWnd[index]=NULL; cjL!$OE6  
    HotKey[index]=0; ;%)i/MGEB  
    HotKeyMask[index]=0; 2;3q](d   
    bRemoved=TRUE; =[$*PTe  
    KeyCount--; />?d 2?  
    break; >Y:ouN~<  
   } mMR[(  
  } 9D@Ez"xv  
 } pGC`HTo|  
 return bRemoved; Mm5l>D'c  
} 6 B )   
Oj2[(7 mO/  
TCYnErqk  
  DLL中的钩子函数如下: (]JJ?aAF  
T'XRl@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >wn&+%i&  
{ W^x[ma z  
 BOOL bProcessed=FALSE; ,/KHKLY7  
 if(HC_ACTION==nCode) ]Vubz54  
 { _^B+Xo@E-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &HE8O}<>  
   switch(wParam) REJ}T:  
   {  ;rFa I^  
    case VK_MENU: $KiA~l  
     MaskBits&=~ALTBIT; {|fA{ Q_R  
     break; NO&OuiN  
    case VK_CONTROL: LRs{nN.N  
     MaskBits&=~CTRLBIT; 4DNZ y2`  
     break; I|.B-$gH  
    case VK_SHIFT: ,W#y7 t  
     MaskBits&=~SHIFTBIT; /xmd]XM=_  
     break; %l,Xt"nS#  
    default: //judge the key and send message !#r]f9QP  
     break; 6l=n&YO  
   } {Hb _o)S  
   for(int index=0;index<MAX_KEY;index++){ 4]cOTXk9C  
    if(hCallWnd[index]==NULL) ZE :oK   
     continue; 6x{B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eRf 8'-"#-  
    { 6 @d( <Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9SrV,~zD  
     bProcessed=TRUE; H=dj\Br`  
    } /f#sg7)  
   } T57S!CJ^$5  
  } }b-?Dm_H  
  else if((lParam&0xc000ffff)==1){ //有键按下 :{sX8U%  
   switch(wParam) N9i>81tY  
   { d&fENnt?h  
    case VK_MENU: .{Xi&[jw  
     MaskBits|=ALTBIT; k~?@~xm,R  
     break; @a~K#Bvlm  
    case VK_CONTROL: f_ ::?  
     MaskBits|=CTRLBIT; -Ju!2by  
     break; xGA%/dy,;  
    case VK_SHIFT: -0W;b"]+A  
     MaskBits|=SHIFTBIT; +n0y/0Au  
     break; 0]Li "Wb  
    default: //judge the key and send message ]t,ppFC#  
     break; NZl0sX.:  
   } ur'A;B  
   for(int index=0;index<MAX_KEY;index++){ GUK/Xiu  
    if(hCallWnd[index]==NULL) G~_dSa@g G  
     continue; u^`B#b '  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JeO(sj$e  
    { ]@'YlPU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n>@(gDq  
     bProcessed=TRUE; L 0|u^J  
    } 0uZHH  
   } Di&tm1R1  
  } ]-O:|q>]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q{>{ e3z}  
   for(int index=0;index<MAX_KEY;index++){ A5z`3T;1  
    if(hCallWnd[index]==NULL) <EE)d@%>v  
     continue; %9M_ * ]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2nw P-i  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (j'[t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .rS0zU  
   } {RzlmDStV  
  } <$UY{"?  
 } O|8p #  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KQEnC`Nz  
} LOp<c<+aW  
j/9'L^]  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: a.q=  
8&3G|m1-2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m:'fk;khN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N!,@}s  
zW\&q!`IRP  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: f#[Fqkmj  
kQYX[e7n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d/"e3S1  
{ nlJxF5/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Fd3V5h  
 { N5 g!,3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 L"AZ,|wIk  
  SaveBmp(); &'R\yX<J)  
  return FALSE; b,I$.&BD  
 } D].1X0^hp  
 …… //其它处理及默认处理 w,^!kO0)~8  
} Ix}:!L  
Jz3u r)|  
Ru2kC} Dx!  
  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。 OJ&~uV>2  
/ S]<MS  
  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。 ^f@EDG8  
^'#vUj:"  
  二、编程步骤 ]81P<Y(7  
'b%S3)}  
  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"; h\jwXMi,tj  
$yG=exh3v  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y_QK _R<f  
3^C  
  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; c\7~_w2  
0*x  
  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; 3PPN_Z  
 w;)@2}  
  5、 添加代码,编译运行程序。 !A g W @  
NKh8'=S  
三、程序代码 U@DIO/C,m`  
SxH b76 ;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL PY~cu@'k{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) $o5<#g"/T  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ cR _ 8 5  
#if _MSC_VER > 1000 `Fnt#F}  
#pragma once ~Sh8. ++}  
#endif // _MSC_VER > 1000 R{u/r%  
#ifndef __AFXWIN_H__ e0qU2  
#error include 'stdafx.h' before including this file for PCH ~:v" TuuK  
#endif n YWS'i@  
#include "resource.h" // main symbols bZz ,'  
class CHookApp : public CWinApp .r$d 8J  
{ &E0P`F,GQA  
 public: $SA8$!:  
  CHookApp(); 8Y_wS&eB  
  // Overrides 9F@Q  
  // ClassWizard generated virtual function overrides !3E33  
  //{{AFX_VIRTUAL(CHookApp) n](Q)h'nlo  
 public: "'~55bG  
  virtual BOOL InitInstance(); 8 Zhx&  
  virtual int ExitInstance(); >Ta|#]{  
  //}}AFX_VIRTUAL ;(5b5PA  
  //{{AFX_MSG(CHookApp) iW9G0Ay  
  // NOTE - the ClassWizard will add and remove member functions here. '+JU(x{CCl  
  // DO NOT EDIT what you see in these blocks of generated code ! N8_ c%6GE  
  //}}AFX_MSG wgp{P>oBX  
  DECLARE_MESSAGE_MAP() %9C_p]P*  
}; ncjtv"2R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); z^'3f!:3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J{` G=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OLg=kF[[  
BOOL InitHotkey(); @FU9!  
BOOL UnInit(); \ ?sM  
#endif 1U^;fqvja  
TldqF BX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n j0!  
#include "stdafx.h" tUaDwIu#  
#include "hook.h" PS7ta?V QC  
#include <windowsx.h> XmJu{RbS  
#ifdef _DEBUG _vr> -:G  
#define new DEBUG_NEW Xz4T_-X8d  
#undef THIS_FILE 76Ho\}-U">  
static char THIS_FILE[] = __FILE__; B"P-h^oiV  
#endif YEqZ((H  
#define MAX_KEY 100 Rf9;jwU  
#define CTRLBIT 0x04 OXAr..  
#define ALTBIT 0x02 $qO%lJ:  
#define SHIFTBIT 0x01 8A}cxk  
#pragma data_seg("shareddata") L"e8S%UqX  
HHOOK hHook =NULL; 2 ,RO  
UINT nHookCount =0; $q%r}Cdg  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey mO=bq4!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT .W>LEz'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V $Y=JK@  
static int KeyCount =0; <#HQU<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ROqz$yY  
#pragma data_seg() Hwiw:lPq`E  
HINSTANCE hins; r~ N:|ip=  
void VerifyWindow(); mqUn3F3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |soDt <y+L  
//{{AFX_MSG_MAP(CHookApp) X?kw=x{2P  
// NOTE - the ClassWizard will add and remove mapping macros here. KsVN<eR{  
// DO NOT EDIT what you see in these blocks of generated code! X2\1OWR0  
//}}AFX_MSG_MAP AYb-BaIc  
END_MESSAGE_MAP() a/p} ?!\  
Q#M@!&  
CHookApp::CHookApp() qD!qSM  
{ ,E ]vM&  
 // TODO: add construction code here, s aY;[bz}  
 // Place all significant initialization in InitInstance ))ArM-02  
} {^(h*zxn  
t`%Xxxu  
CHookApp theApp; `-yo-59E[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~$w9L998+  
{ J;8M. _  
 BOOL bProcessed=FALSE; [C@ |q Ah  
 if(HC_ACTION==nCode) C ^QpVt-T  
 { jTHgh>n  
  if((lParam&0xc0000000)==0xc0000000){// Key up dA 03,s  
   switch(wParam) lW6$v* s9  
   { xfegi$  
    case VK_MENU: wjEyU:  
     MaskBits&=~ALTBIT; [P_@-:(O  
     break; rHngYcjR  
    case VK_CONTROL: Q>d<4]`  
     MaskBits&=~CTRLBIT; Fw.df<  
     break; mQd L"caA  
    case VK_SHIFT: z.Y`"B'j`  
     MaskBits&=~SHIFTBIT; K)DpC*j  
     break; J> Z.2  
    default: //judge the key and send message {$AwG#kt  
     break; @'IRh9  
   } k7ye,_&>  
   for(int index=0;index<MAX_KEY;index++){ 9^+8b9y  
    if(hCallWnd[index]==NULL) dBRK6hFC  
     continue; Bl$Hg,in-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^GL>xlZ(  
    { C"7-lz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~S\y)l\wZ  
     bProcessed=TRUE; y) .dw(  
    } 2UbTKN  
   } M1HGXdN*B  
  } #EG$HX]  
  else if((lParam&0xc000ffff)==1){ //Key down a*2JLK  
   switch(wParam) ka=EOiX.  
   { <Dk6o`7^N  
    case VK_MENU: to,\sc  
     MaskBits|=ALTBIT; 0^('hS&  
     break; 9Ib#A  
    case VK_CONTROL: `En>o~L;  
     MaskBits|=CTRLBIT; ^7l+ Of b3  
     break; 2r^G;,{  
    case VK_SHIFT: ;X;q8J^_K_  
     MaskBits|=SHIFTBIT; nI_UL  
     break; 0+{CN|0  
    default: //judge the key and send message yt+d f0l  
     break; [x[ nTIg  
   } 5do49H_  
   for(int index=0;index<MAX_KEY;index++) $Cnv]1%  
   { .(g"(fgF  
    if(hCallWnd[index]==NULL) ]L6[ vJHx  
     continue; 4ux^K:z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }kZ)|/]kn  
    { &iI5^b-P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ssY5g !%  
     bProcessed=TRUE; SX1w5+p$C  
    } F<0GX!p4u  
   } O_ 4 j"0  
  } N!lQ;o'  
  if(!bProcessed){ Wj I NY  
   for(int index=0;index<MAX_KEY;index++){ Q@(tyW+8U@  
    if(hCallWnd[index]==NULL) Q ym=L(X  
     continue;  $*$X5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L S%;ZKJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $97EeE:{M  
   } 1|XC$0  
  } |SX31T9rG  
 } CaB@,L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S; Fj9\2)I  
} B`w@Xk'D  
jJqq:.XqB8  
BOOL InitHotkey() )0XJOm  
{ eKvQS}11  
 if(hHook!=NULL){ "30R%oL]=  
  nHookCount++; hqc)Ydg_%  
  return TRUE; |C`.m |  
 } 5H!6m_,w  
 else E}lNb  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }.t8C y9G  
  if(hHook!=NULL) v|IG G'r  
   nHookCount++; UF PSQ  
  return (hHook!=NULL); Z/oP?2/Afh  
} vYNu=vnM  
BOOL UnInit() |2!cPf^8  
{ *\#?)q  
 if(nHookCount>1){ $:IEpV{  
  nHookCount--; f#3!Q!C^  
  return TRUE; ~y" ^t@!E  
 } !SAR/sdXf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >Pwu>  
 if(unhooked==TRUE){ ? t_$C,A+  
  nHookCount=0; :9]"4ktoJ  
  hHook=NULL; w,VUWja  
 } =bh.V@*  
 return unhooked; ~]78R!HJ  
} <G60R^o  
oi\e[qE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QHPC?a6CD  
{ 9B9:lR  
 BOOL bAdded=FALSE; MVkO >s  
 for(int index=0;index<MAX_KEY;index++){ Yq0jw&v  
  if(hCallWnd[index]==0){ Evt&N)l!^  
   hCallWnd[index]=hWnd; dkAY%ztwo  
   HotKey[index]=cKey; _ipY;  
   HotKeyMask[index]=cMask; C^fUhLVSZ^  
   bAdded=TRUE; ; %mYsQ  
   KeyCount++; u&Cu"-%=M  
   break; L4!T  
  } \QP1jB  
 } -_T@kg[0zB  
 return bAdded; 4h$W4NJK  
} VWT\wA L  
s5&v~I;>e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :d} @Z}2sD  
{ \[Q*d  
 BOOL bRemoved=FALSE; |m>{< :  
 for(int index=0;index<MAX_KEY;index++){ 0u=FlQ }h  
  if(hCallWnd[index]==hWnd){ k|; [)gE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L@x#:s=  
    hCallWnd[index]=NULL; Zd <8c^@  
    HotKey[index]=0; M D,+>kh  
    HotKeyMask[index]=0; M&ec%<lM  
    bRemoved=TRUE; tWa_-Un3  
    KeyCount--; <~iA{sY)O  
    break; ;To][J  
   } |yYu!+U  
  } o 4cqLM u  
 } DcX,o*ec!  
 return bRemoved; "2>_eZ#b  
} >*e,+ok  
%Kc2n9W  
void VerifyWindow() 7#9yAS+x(  
{ uS&NRf9A  
 for(int i=0;i<MAX_KEY;i++){ hM~zO1XW  
  if(hCallWnd!=NULL){ gQlL0jAV  
   if(!IsWindow(hCallWnd)){ "FH03 9  
    hCallWnd=NULL; _su$]s  
    HotKey=0; ]`u_d}`  
    HotKeyMask=0; #9 u2LK  
    KeyCount--; m8NKuhu  
   } :uQ~?amM  
  } MtXTh*4  
 } xy Pz_9  
} C?fa-i0l^  
b5Vn_;V*  
BOOL CHookApp::InitInstance() HN~  
{ &'A8R;b}-?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +X4/l"|  
 hins=AfxGetInstanceHandle(); m6YDyQC  
 InitHotkey(); obtXtqew  
 return CWinApp::InitInstance(); xq\A TON  
} f ,WAl\  
?n9?`8a#  
int CHookApp::ExitInstance() K-,8~8[  
{ IHStN,QD  
 VerifyWindow(); \iM  
 UnInit(); q&0I7OV  
 return CWinApp::ExitInstance(); 6U[bAp  
} @`H47@e  
/d-d8n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $Y&rci]  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ht5eb"c+ 8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Dfl%Knl@J  
#if _MSC_VER > 1000 cUK9EOPe  
#pragma once  "?(N  
#endif // _MSC_VER > 1000 :vRUb>z  
mIm.+U`a2  
class CCaptureDlg : public CDialog hkoCbR0}8  
{ 4.qW ~ W{  
 // Construction yVl?gGgh  
 public: _|} GhdYE  
  BOOL bTray; J)"g`)\2+  
  BOOL bRegistered; _NkbB"+L  
  BOOL RegisterHotkey(); VmTPE5d  
  UCHAR cKey; ' Y cVFi  
  UCHAR cMask; $*z>t*{7  
  void DeleteIcon(); #t?tt,nc}  
  void AddIcon(); j/PNi@  
  UINT nCount; Avr2MaY{h  
  void SaveBmp(); ZINqIfc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L0dj 76'M  
  // Dialog Data iR6w)  
  //{{AFX_DATA(CCaptureDlg) cgF?[Z+x  
  enum { IDD = IDD_CAPTURE_DIALOG }; oRQJ YH  
  CComboBox m_Key;  b@m\ca  
  BOOL m_bControl; -3T~+  
  BOOL m_bAlt; Sz#dld Mz  
  BOOL m_bShift; 7-`iI(N<  
  CString m_Path; U3 y-cgE  
  CString m_Number; i! DO  
  //}}AFX_DATA \aB>Q"pS  
  // ClassWizard generated virtual function overrides +ht{ARX2(  
  //{{AFX_VIRTUAL(CCaptureDlg) `D9AtN] R  
 public: m[%*O#_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rA6lyzJ  
 protected: A0`#n|(Ad!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Fg<rz&MR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UqEpeLK  
  //}}AFX_VIRTUAL wU1h(D2&h  
  // Implementation _pe_w{V-b6  
 protected: +*vg) F:  
  HICON m_hIcon; XLxr@1   
  // Generated message map functions xv:VW<  
  //{{AFX_MSG(CCaptureDlg) R0_O/o+{  
  virtual BOOL OnInitDialog(); ZQ'bB5I  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2c4x=%  
  afx_msg void OnPaint(); Q{"QpVY8  
  afx_msg HCURSOR OnQueryDragIcon(); sm>5n_Vw  
  virtual void OnCancel(); Vi o ~2  
  afx_msg void OnAbout(); [mJmT->  
  afx_msg void OnBrowse(); `am]&0g^+(  
  afx_msg void OnChange(); sfw lv^  
 //}}AFX_MSG #CYDh8X<i  
 DECLARE_MESSAGE_MAP() d]<S/D'i  
}; LCf)b>C*  
#endif /swNhDQ"o  
8fX<,*#I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?OFl9%\ V  
#include "stdafx.h" =vc8u&L2  
#include "Capture.h" `R+I(Cb  
#include "CaptureDlg.h" \C eP.,<  
#include <windowsx.h> >Qg 9KGk'  
#pragma comment(lib,"hook.lib") W]U}, g8Z  
#ifdef _DEBUG _)6N&u8  
#define new DEBUG_NEW { i2QLS  
#undef THIS_FILE L}x,>hbT  
static char THIS_FILE[] = __FILE__; Fy8$'oc  
#endif #FQkwX'g  
#define IDM_SHELL WM_USER+1 _0: }"!Gq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S#wy+*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kvo V?<!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; N +M^e`H  
class CAboutDlg : public CDialog MzudCMF  
{ V.U9Q{y"  
 public: *sbZ{{]e  
  CAboutDlg(); ;%_s4  
  // Dialog Data F:B 8J4/  
  //{{AFX_DATA(CAboutDlg) P/hV{@x  
  enum { IDD = IDD_ABOUTBOX }; @fz!]/  
  //}}AFX_DATA qPI1\!z6  
  // ClassWizard generated virtual function overrides h.ln%6:d  
  //{{AFX_VIRTUAL(CAboutDlg) U81--'@y  
 protected: r(Vz(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m}oqs0xx  
  //}}AFX_VIRTUAL GZ@`}7b}  
  // Implementation ;ZVT[gi*  
 protected: 'gQ0=6(\  
  //{{AFX_MSG(CAboutDlg) ?cRGdLP'D  
  //}}AFX_MSG b!J%s   
  DECLARE_MESSAGE_MAP() Sl7x>=  
}; ZgD%*bH*B  
q }'ww  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mtunD;_Dek  
{ 2MQ XtK  
 //{{AFX_DATA_INIT(CAboutDlg) bxrT[]  
 //}}AFX_DATA_INIT S pqbr@j  
} ^}PG*h|  
~Y.I;EPKt  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vz1yH%~E  
{ j[e<CGZ  
 CDialog::DoDataExchange(pDX); `\vqDWh8-  
 //{{AFX_DATA_MAP(CAboutDlg) *fj5$T-Z  
 //}}AFX_DATA_MAP >ukn<  
} uz%<K(:Ov  
&ap&dM0@%a  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |2t1m 6\j  
 //{{AFX_MSG_MAP(CAboutDlg) D{)K00mm  
 // No message handlers X{YY)}^  
 //}}AFX_MSG_MAP a?dUJt  
END_MESSAGE_MAP() o6 l CP&  
fC7rs5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $t{;- DpNB  
: CDialog(CCaptureDlg::IDD, pParent) :fx^{N!T  
{ 7}r6mr0vpm  
 //{{AFX_DATA_INIT(CCaptureDlg) 8uq`^l%KkZ  
  m_bControl = FALSE; W7PL]5y&  
  m_bAlt = FALSE; =}1)/gcM  
  m_bShift = FALSE; }#Gq*^w  
  m_Path = _T("c:\\"); 7kDqgod^A  
  m_Number = _T("0 picture captured."); 1](PuQm7+  
  nCount=0; "AcC\iq  
  bRegistered=FALSE; suF<VJ)&s  
  bTray=FALSE; ](2\w9i%  
 //}}AFX_DATA_INIT L)qDtXd4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $]`rWSYtv`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yPXa  
} c`E0sgp  
YQ7\99tj  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P]mJ01@'  
{ TEN~3 Ef#  
 CDialog::DoDataExchange(pDX); gL(_!mcwu  
 //{{AFX_DATA_MAP(CCaptureDlg) LjEG1$F>  
  DDX_Control(pDX, IDC_KEY, m_Key); {IgL H`@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =lOdg3#\a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FMNT0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L#6!W  
  DDX_Text(pDX, IDC_PATH, m_Path); ^1mnw@04  
  DDX_Text(pDX, IDC_NUMBER, m_Number); CAT{)*xc  
 //}}AFX_DATA_MAP 5"WI^"6b:  
} f]C`]qg  
@yj$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,%X"Caz  
//{{AFX_MSG_MAP(CCaptureDlg) LuE0Hb"S8  
 ON_WM_SYSCOMMAND() 9 7Ua,  
 ON_WM_PAINT() #M5pQ&yZy  
 ON_WM_QUERYDRAGICON() kIwq%c;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W Yo>Md 8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RE%25t|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7RZ HU+  
//}}AFX_MSG_MAP 5 !Ho[  
END_MESSAGE_MAP() !+V."*]l  
a9N$I@bi]  
BOOL CCaptureDlg::OnInitDialog() !(8) '<t9  
{ IDK~ (t  
 CDialog::OnInitDialog(); #Y%(CI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?[!_f$50]P  
 ASSERT(IDM_ABOUTBOX < 0xF000); y)K!l :X  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -SlAt$IJ  
 if (pSysMenu != NULL) o#\c:D*k  
 { 3'z L,WW  
  CString strAboutMenu; nIEIb.-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4L_AhX7  
  if (!strAboutMenu.IsEmpty()) n3" @E<rW  
  { ym;I(TC+  
   pSysMenu->AppendMenu(MF_SEPARATOR); l0K_29^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9'Cu9nR  
  } *ORa@ x  
 } C1w6[f1+  
 SetIcon(m_hIcon, TRUE); // Set big icon ,~G:>q$ad  
 SetIcon(m_hIcon, FALSE); // Set small icon Q>g-xe 1  
 m_Key.SetCurSel(0); <0btwsv}  
 RegisterHotkey(); dthtWnB@  
 CMenu* pMenu=GetSystemMenu(FALSE); 's\rQ-TV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :2*0Jh3_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @>q4hYF  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -_^#7]  
 return TRUE; // return TRUE unless you set the focus to a control Y;1s=B9  
} u-u:7VtH0=  
7TB&Q*Zf  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cMoBYk  
{ W_bA.z T{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) XES$V15  
 { 2= )V"lR\  
  CAboutDlg dlgAbout; J 7HOSFwXn  
  dlgAbout.DoModal(); RHu4cK!5  
 } RH^; M-'  
 else WiqkC#N  
 { Fgw$;W  
  CDialog::OnSysCommand(nID, lParam); 5 D[`nU}  
 } q-r5zGI  
} =6d'/D#J  
/}Ct2w&<k  
void CCaptureDlg::OnPaint() Q;k D Jo  
{ @g] >D  
 if (IsIconic()) S76x EL  
 { l<UA0*t  
  CPaintDC dc(this); // device context for painting 4bq+(CI6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \F9HsR6  
  // Center icon in client rectangle TUX:[1~Nf[  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?8ady% .ls  
  int cyIcon = GetSystemMetrics(SM_CYICON); &\W5|*`x-  
  CRect rect; us )NgG  
  GetClientRect(&rect); $]~|W3\G  
  int x = (rect.Width() - cxIcon + 1) / 2; FPkig`(3  
  int y = (rect.Height() - cyIcon + 1) / 2; `{&l _  
  // Draw the icon I#- T/1N  
  dc.DrawIcon(x, y, m_hIcon); B*^8kc:)L  
 } yHnN7&  
 else 0Ci:w|J  
 { (G 9Ku 8Y  
  CDialog::OnPaint(); yPk s,7U  
 } 1>)uI@?Rb  
} Q(BM0n)f  
$%z M Z  
HCURSOR CCaptureDlg::OnQueryDragIcon() BWLeitS/  
{ ',s{N9  
 return (HCURSOR) m_hIcon; 6)1xjE#  
} .#_g.0<  
uz@lz +  
void CCaptureDlg::OnCancel() 4`p[t;q  
{ vFK!LeF%  
 if(bTray) RJE<1!{  
  DeleteIcon(); \ocC'FmE  
  CDialog::OnCancel(); r?R!/`f  
} n:[LsbTk  
7!q.MOYm  
void CCaptureDlg::OnAbout() ka<rlh<h  
{ }qN   
 CAboutDlg dlg; TB#oauJm,  
 dlg.DoModal(); p;rT#R&6>  
} EoOwu-{  
24I~{Qy  
void CCaptureDlg::OnBrowse() yG:Pg MrB  
{ "FXT8Qxg  
 CString str; '_%`0p1  
 BROWSEINFO bi; =%0r_#F%=  
 char name[MAX_PATH]; X`0`A2 n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); rlSflcK\\(  
 bi.hwndOwner=GetSafeHwnd(); |c:xK{Ik  
 bi.pszDisplayName=name; ~c|{PZ9U  
 bi.lpszTitle="Select folder"; AUwIF/>F(]  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; fHacVj J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4Dv42fO  
 if(idl==NULL) p} i5z_tS  
  return; aWMEo`O%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3k* U/*  
 str.ReleaseBuffer(); FQw@ @  
 m_Path=str; !;.nL-NQ  
 if(str.GetAt(str.GetLength()-1)!='\\') 3t$)saQR  
  m_Path+="\\"; YCu9dBeVS  
 UpdateData(FALSE); 2@a]x(  
} Hv .C5mo  
0BQ<a  
void CCaptureDlg::SaveBmp() }zqYn`ffD  
{ Q*caX   
 CDC dc; Jtl[9qe#]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8\rHSsP  
 CBitmap bm; pu5-=QN  
 int Width=GetSystemMetrics(SM_CXSCREEN); S@eI3Pk E  
 int Height=GetSystemMetrics(SM_CYSCREEN); "hXB_73)V  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]`}R,'P  
 CDC tdc; 3QD##Wr^  
 tdc.CreateCompatibleDC(&dc); $jNp-5+Q;  
 CBitmap*pOld=tdc.SelectObject(&bm); n##d!d|g  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |d=MX>i|G  
 tdc.SelectObject(pOld); ns9a+QQ  
 BITMAP btm; j:J{m0  
 bm.GetBitmap(&btm); bId@V[9  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ,XmyC7y<  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S`&YY89{&  
 BITMAPINFOHEADER bih; hFr?84sAd  
 bih.biBitCount=btm.bmBitsPixel; M;F&Ix  
 bih.biClrImportant=0; :EZ"D#>y~  
 bih.biClrUsed=0; +)-`$N  
 bih.biCompression=0; i>L>3]SRr{  
 bih.biHeight=btm.bmHeight; VD-2{em  
 bih.biPlanes=1; Wf:I 0  
 bih.biSize=sizeof(BITMAPINFOHEADER); O)9{qU:[b  
 bih.biSizeImage=size; VH5Vg We  
 bih.biWidth=btm.bmWidth; Dv[ 35[Yh  
 bih.biXPelsPerMeter=0; t"]~e"  
 bih.biYPelsPerMeter=0; %2TjG  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  XV*uu "F  
 static int filecount=0; tS&rR0<OW  
 CString name; d=8q/]_p  
 name.Format("pict%04d.bmp",filecount++); u7kw/_f  
 name=m_Path+name; psZ #^@>mJ  
 BITMAPFILEHEADER bfh; tQrkRg(E:  
 bfh.bfReserved1=bfh.bfReserved2=0; xbhU:,o  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Oa|'wh ug  
 bfh.bfSize=54+size;  QKtTy>5  
 bfh.bfOffBits=54; k-a3oLCR,  
 CFile bf; ,1&</R_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ d}RR!i`<N  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _ya_Jf*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'hl4cHk14  
  bf.WriteHuge(lpData,size); J,j!  
  bf.Close(); l-RwCw4f  
  nCount++; G!3d!$t  
 } #jNN?,ZK  
 GlobalFreePtr(lpData); 3erGTa[|q  
 if(nCount==1) 5cE?>  
  m_Number.Format("%d picture captured.",nCount); & !I$  
 else 5rx;?yvn  
  m_Number.Format("%d pictures captured.",nCount); sy;_%,}N  
  UpdateData(FALSE); c;pv< lX'  
} 6_h'0~3?`  
M;K%=l$NG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fG*366W  
{ m6oaO9"K  
 if(pMsg -> message == WM_KEYDOWN) l gzA) (  
 { { |[n>k   
  if(pMsg -> wParam == VK_ESCAPE) XUp'wP  
   return TRUE; k(.6K[ b  
  if(pMsg -> wParam == VK_RETURN) dCkk5&2n  
   return TRUE; /vLdm-4  
 } N9A#@c0O  
 return CDialog::PreTranslateMessage(pMsg); 0xQ="aXE  
} t\%gP@?  
/"%(i#<)xs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x[5uz))  
{ yq2pg8%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kL1StF#p  
  SaveBmp(); v8!Ts"  
  return FALSE; QBI;aG<+b>  
} ,aBo p#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ >=Pn\" j  
 CMenu pop; -%eBip,'yl  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z<c%Xl\$%  
 CMenu*pMenu=pop.GetSubMenu(0); .V Cfh+*J#  
 pMenu->SetDefaultItem(ID_EXITICON); ^yo~C3 r~  
 CPoint pt; >MeM  
 GetCursorPos(&pt); T,D(Xh  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^$I8ga  
 if(id==ID_EXITICON) ckTk2xPQ  
  DeleteIcon(); 1SGLA"r  
 else if(id==ID_EXIT) x<es1A'u6  
  OnCancel(); F+3}Gkn  
 return FALSE; o6[aP[~F  
} |kXx9vGq@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c/Ykk7T9--  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2)zAX"#/  
 AddIcon(); -]K9sy)I  
 return res; FELDz7DYya  
} 3</gK$f2  
H${5pY_M  
void CCaptureDlg::AddIcon() gL:Vj%c  
{ Z>si%Npm\  
 NOTIFYICONDATA data; O<o>/HH$  
 data.cbSize=sizeof(NOTIFYICONDATA); %2jRJ  
 CString tip; M)JKe!0ad1  
 tip.LoadString(IDS_ICONTIP); ,s9gGCA  
 data.hIcon=GetIcon(0); A3 |hFk  
 data.hWnd=GetSafeHwnd(); :_f5(N*{5o  
 strcpy(data.szTip,tip); Y3QrD&V  
 data.uCallbackMessage=IDM_SHELL; GZwz4=`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (6Tvu5*4U  
 data.uID=98; 6S GV}dAx  
 Shell_NotifyIcon(NIM_ADD,&data); 5v`[c+@F  
 ShowWindow(SW_HIDE); ' M'k$G@Z  
 bTray=TRUE; -FGQn |h4  
} n+XLZf#  
F?B`rw@xr  
void CCaptureDlg::DeleteIcon() Qmg2lP.)  
{ ^f%hhpV@  
 NOTIFYICONDATA data; BHZCM^  
 data.cbSize=sizeof(NOTIFYICONDATA); zY=eeG+4s  
 data.hWnd=GetSafeHwnd(); >3Mzs AH\  
 data.uID=98; y`|86` Y  
 Shell_NotifyIcon(NIM_DELETE,&data); ,&5\`  
 ShowWindow(SW_SHOW); Ey#7L M)  
 SetForegroundWindow(); !\ 6<kQg#  
 ShowWindow(SW_SHOWNORMAL); f"}g5eg+  
 bTray=FALSE; ac%6eW0#  
} $%P?2g"j,  
1R+/T  
void CCaptureDlg::OnChange() FP_q?=~rFs  
{ 8h%oJ4da   
 RegisterHotkey(); 4Nun-(q  
} _ / >JM0  
#{DX*;1m  
BOOL CCaptureDlg::RegisterHotkey() u9zEhfg8  
{ -/'_XR@1  
 UpdateData(); <(c_[o/  
 UCHAR mask=0; 5mYX#//:  
 UCHAR key=0; iX|K4.Pz{  
 if(m_bControl) lPaTkZw  
  mask|=4; =+z+`ot  
 if(m_bAlt) };Oyv7D+b  
  mask|=2; Id}/(Pkq  
 if(m_bShift) bQlvb  
  mask|=1; Oe~x,=X)  
  key=Key_Table[m_Key.GetCurSel()]; 9>6DA^  
 if(bRegistered){ rV_i|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @$aGVEcU$  
  bRegistered=FALSE; LGdM40  
 } 9Gc4mwu  
 cMask=mask; J{!U;r!6  
 cKey=key; K!,T.qA&=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8=  kwc   
 return bRegistered; $Vp*,oRL  
} !y\r.fm!A  
?`lD|~  
  四、小结 .<Rw16O  
DEw>f%&4  
  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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