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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: ! 0DOj["  
   aWTvowA  
  一、实现方法 `vc?*"  
k0^t$J W  
  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: P3op1/Np  
+F@ZVMp  
#pragma data_seg("shareddata") IQNvhl.{  
HHOOK hHook =NULL; //钩子句柄 cI/Puh^3  
UINT nHookCount =0; //挂接的程序数目 UJ^MS4;I3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8^2E77s4U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3:ELYn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V|`w/P9g4  
static int KeyCount =0; *\"+/   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,JONc9  
#pragma data_seg() ;cD&qheDV  
..a@9#D  
  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。 /4wPMAlb  
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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: E~K5n2CI  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $_orxu0W  
cKey,UCHAR cMask) O Zn40"`  
{ $s`#&.>c-  
 BOOL bAdded=FALSE; &++tp5  
 for(int index=0;index<MAX_KEY;index++){ FL?Ndy"I  
  if(hCallWnd[index]==0){ 2}xvM"k=k  
   hCallWnd[index]=hWnd; Wa!}$q+  
   HotKey[index]=cKey; =OR "Bd:O  
   HotKeyMask[index]=cMask; <S@XK%  
   bAdded=TRUE; >m'n#=yap  
   KeyCount++; s.j6" Q[W  
   break; ywkyxt  
  } {O"N2W  
 } oF {u  
 return bAdded; & T&>4I!'M  
} kB3@;z:  
//删除热键 O&@pi-=o  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,WgEl4  
{ qx2M"uFJ  
 BOOL bRemoved=FALSE; 7rSads  
 for(int index=0;index<MAX_KEY;index++){ 6 ~.{~+Bd  
  if(hCallWnd[index]==hWnd){ S*w;$`Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >4iVVs  
    hCallWnd[index]=NULL; _sX@BE  
    HotKey[index]=0; JK9 J;c#T  
    HotKeyMask[index]=0; fj:q_P67o  
    bRemoved=TRUE; ,cCBAO ueO  
    KeyCount--; >#EOCo  
    break; ['JIMcD  
   } I6lWB(H!u  
  } (>M? iB  
 } Gq0Q}[53  
 return bRemoved; CEl9/"0s6  
} _4-UM2o;  
E;-*LT&{  
kDWMget$  
  DLL中的钩子函数如下: :{'%I#k2  
\wM8I-f!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W`gzMx  
{ MYMg/>f[  
 BOOL bProcessed=FALSE; :=e"D;5  
 if(HC_ACTION==nCode) :V ZXI#([  
 { Z,JoxK2"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'Fr"96C$  
   switch(wParam) h;JO"J@H  
   {  zya2 O?s  
    case VK_MENU: -4LckY=]1  
     MaskBits&=~ALTBIT; Gzkvj:(V  
     break; cTu"Tu\Qw  
    case VK_CONTROL: wNQhg  
     MaskBits&=~CTRLBIT; *EllE+M{n  
     break; r31)Ed$  
    case VK_SHIFT: U C..)9  
     MaskBits&=~SHIFTBIT; 7 DW_G  
     break; Y wu > k  
    default: //judge the key and send message :`<ME/"YE  
     break; BVe c  
   } Pt\GVWi_t  
   for(int index=0;index<MAX_KEY;index++){ HMl M!Xk?  
    if(hCallWnd[index]==NULL) H}PZJf_E  
     continue; =l+~}/7'Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'v0(ki#  
    { 6`V~cVu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d$#DXLA\P  
     bProcessed=TRUE; YF6 8 Ax]  
    } SK t&BnW  
   } vNSeNS@jxC  
  } E:ti]$$  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ck>{7 Gw  
   switch(wParam) _ 0h)O  
   { L.Tu7+M4  
    case VK_MENU: ]%eyrbU  
     MaskBits|=ALTBIT; %[WOQ.Sh  
     break; Bhg,P.7  
    case VK_CONTROL: kX "*kD  
     MaskBits|=CTRLBIT; ?~=5 x  
     break; H C(7,3  
    case VK_SHIFT: u5rHQA0%  
     MaskBits|=SHIFTBIT; YlJ_$Q[  
     break; ZIs=%6""&  
    default: //judge the key and send message Apbgm[m|{  
     break; kj/v$m  
   } >bbvQb +j  
   for(int index=0;index<MAX_KEY;index++){ iCNJ%AZ H  
    if(hCallWnd[index]==NULL) I~) A!vp  
     continue; nl+8C}=u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,KFF[z  
    { k<QZ_*x}G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); f?W"^6Df  
     bProcessed=TRUE; 5KC Zg'h  
    } *_H^]wNJG  
   } aK?PK }@  
  } ykD-L^}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4`'V%)M  
   for(int index=0;index<MAX_KEY;index++){ 0P^&{ek+)  
    if(hCallWnd[index]==NULL) Qv;q*4_  
     continue; X1 FKcWv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wuKr 9W9Xa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \ fSo9$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tNC ;CP#R+  
   } 3S{3AmKj?  
  } ^F g!.X_  
 } oz&RNB.K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :@#6]W  
} OCv,EZ  
5 [X,?  
  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: P 9?I]a)G  
-muP.h/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <K {|#ND#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7_c/wbA#me  
{Y1&GO;  
  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: I]6,hygs  
a Juv{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @Zw[LIQ*  
{ mu$rG3M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (7w95xI  
 { K:54`UJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N4$ K {  
  SaveBmp(); Ls/*&u  
  return FALSE; PasVfC@  
 } C"R}_C|r)*  
 …… //其它处理及默认处理 'H-hp   
} ("P]bU+'>  
3T~DeqAyw  
`i)Pf WdBN  
  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。 >6Ody<JPHP  
(CrP6]=  
  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。 bA\(oD+:  
{Lugdf'  
  二、编程步骤 u-@;Q<v$  
&EJ/Rl  
  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"; 79Ur1-]/  
cQrXrij;!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l0=VE#rFl  
N fND@m{/  
  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; Kj/Lcx;bh  
x\aCZ  
  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; V<Co!2S  
hQwUw foe@  
  5、 添加代码,编译运行程序。 21 z@-&Oq  
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三、程序代码 j9f[){m`  
9gac7(2`)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL He1~27+99  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3hfv^H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5,9cD`WR^  
#if _MSC_VER > 1000 \]0+J  
#pragma once ?G 'sb}.  
#endif // _MSC_VER > 1000 K&BaGrR  
#ifndef __AFXWIN_H__ ?^WX] SAl  
#error include 'stdafx.h' before including this file for PCH 5V8`-yO9  
#endif S~U5xM^s  
#include "resource.h" // main symbols tY%T  
class CHookApp : public CWinApp -%TwtO<$']  
{ -q&7q  
 public: rm4t  
  CHookApp(); V(;c#%I2  
  // Overrides ;E0x#JUrw  
  // ClassWizard generated virtual function overrides : `,#z?Rk  
  //{{AFX_VIRTUAL(CHookApp) :eFyd`Syw  
 public: ~~}8D"  
  virtual BOOL InitInstance(); /Nns3oE  
  virtual int ExitInstance(); %e+{wU}w?2  
  //}}AFX_VIRTUAL &(h@]F!  
  //{{AFX_MSG(CHookApp) t|C?=:_  
  // NOTE - the ClassWizard will add and remove member functions here. 5I[6 "o0  
  // DO NOT EDIT what you see in these blocks of generated code ! NL&![;  
  //}}AFX_MSG TGuCIc0B{  
  DECLARE_MESSAGE_MAP() t(1gJZs>kX  
}; 00pe4^U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $ZlzS`XF7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); th}&|Y)T2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W/.Wp|C}K3  
BOOL InitHotkey(); 2/ejU,S  
BOOL UnInit(); y=zs6HaS  
#endif "qoJIwl#q  
IwR=@Ne8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. B$MHn?  
#include "stdafx.h" o.wXaS8  
#include "hook.h" z`sW5K(A  
#include <windowsx.h> I].ddR%  
#ifdef _DEBUG 7>f)pfLM  
#define new DEBUG_NEW &/?OP)N,}  
#undef THIS_FILE BiA^]h/|  
static char THIS_FILE[] = __FILE__; ~!6 I.u  
#endif r{wf;5d(  
#define MAX_KEY 100 6kO+E5;X  
#define CTRLBIT 0x04 rge s`&0  
#define ALTBIT 0x02 %' eaW  
#define SHIFTBIT 0x01 /4$ c-k  
#pragma data_seg("shareddata") 1w#vy1m J  
HHOOK hHook =NULL; Y4N)yMSl"  
UINT nHookCount =0; ekd;sEO  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tG[v@-O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ge#P(Itz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 7-mo\jw<  
static int KeyCount =0; (zw.?ADPCT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift tR(L>ZG{  
#pragma data_seg() \zzPsnFIg  
HINSTANCE hins; c 6/lfgN  
void VerifyWindow(); Up*6K=Tny  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) S+l>@wa)|  
//{{AFX_MSG_MAP(CHookApp) YGhHIziI  
// NOTE - the ClassWizard will add and remove mapping macros here. x$KQ*P~q  
// DO NOT EDIT what you see in these blocks of generated code! L#fSP  
//}}AFX_MSG_MAP aT8A +=K6  
END_MESSAGE_MAP() 40$9./fe)  
D0yH2[j+  
CHookApp::CHookApp() T#a6X;9P  
{ !L)yI#i4C  
 // TODO: add construction code here, `+(4t4@ew  
 // Place all significant initialization in InitInstance EUS^Gtc  
} 1-Q>[Uz,  
ceAefKdb  
CHookApp theApp; Ryn@">sVI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hA+;eXy/  
{ M1I4Ot  
 BOOL bProcessed=FALSE; OT#foP   
 if(HC_ACTION==nCode) Tj=@5lj0  
 { 9`!#5i)VU8  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5#::42oE  
   switch(wParam) iOiXo6YE  
   { X [;n149o  
    case VK_MENU: \3whM6tK  
     MaskBits&=~ALTBIT; XlJ+:st  
     break; 5D>cbzP@  
    case VK_CONTROL: ~e=KBYDBu  
     MaskBits&=~CTRLBIT; S9 @*g3  
     break; gXB&Sgjo  
    case VK_SHIFT: Y{L|ja%9?  
     MaskBits&=~SHIFTBIT; jR{t=da  
     break; iBCIJ!;  
    default: //judge the key and send message V,eH E5C  
     break; 29NP!W /g  
   } Hr/J6kyB)  
   for(int index=0;index<MAX_KEY;index++){ 2>im'x 5  
    if(hCallWnd[index]==NULL) MJ.Kor  
     continue; x)T07,3:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U!T#'H5'-  
    { kS_3 7-;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3Z74&a$  
     bProcessed=TRUE; ]o`FF="at  
    } uN6xOq/  
   } uR82},r$m  
  } uU1q?|4  
  else if((lParam&0xc000ffff)==1){ //Key down BF U#FE)s  
   switch(wParam) 2Oy-jM  
   { Rr>""  
    case VK_MENU: _? u} Jy_  
     MaskBits|=ALTBIT; N}q*(r!q<  
     break; r8!M8Sc  
    case VK_CONTROL: /P*ph0S-  
     MaskBits|=CTRLBIT; #M92=IH  
     break; qb5IpI{U  
    case VK_SHIFT: #e6x_o|  
     MaskBits|=SHIFTBIT; >u=nGeO  
     break; k_1o j[O  
    default: //judge the key and send message #DcK{|ty  
     break; cQh=Mri]  
   } yJw4!A 1!  
   for(int index=0;index<MAX_KEY;index++) /(bn+l}W  
   { DkBVk+  
    if(hCallWnd[index]==NULL) e3kdIOu5  
     continue; IE&G7\>(yO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zh_ P  
    { < !]7Gt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0WAOA6 _x  
     bProcessed=TRUE; BF]+fs`  
    } UFUm-~x`  
   } G_?qY#"(  
  } 5fK<DkB$>:  
  if(!bProcessed){ vo2TP:  
   for(int index=0;index<MAX_KEY;index++){ jce2lXMm  
    if(hCallWnd[index]==NULL) <(Ktf0'__  
     continue; V,:~FufM^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kZS&q/6A*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m ,TYF  
   } ooT~R2u  
  } 5v#_2Ih  
 } {4b8s%:!4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); znd fIt^  
} '8fL)Zk  
[R Hji47  
BOOL InitHotkey() YCNpJGM  
{ XwdehyPhT2  
 if(hHook!=NULL){ ys |} ;*  
  nHookCount++; }ABHGr5[  
  return TRUE; xiQ;lE   
 } Xr pnc 7  
 else ,U'E!?=:VS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); x<{)xP+|  
  if(hHook!=NULL) `d:cq.OO  
   nHookCount++; BmFs6{>~c  
  return (hHook!=NULL); n\H.NL)  
} 7 *HBb-  
BOOL UnInit() D i #Em[  
{ o<%s\n  
 if(nHookCount>1){ sxQMfbN  
  nHookCount--; S31+ j:"  
  return TRUE; G-sA)WOF  
 } y&+Sp/6BYA  
 BOOL unhooked = UnhookWindowsHookEx(hHook); k'+Mc%pg4E  
 if(unhooked==TRUE){ ]}dAm S/  
  nHookCount=0; NeY,Of|  
  hHook=NULL; woR }=\K  
 } kM/;R)3t4/  
 return unhooked; 1fb!sbGD.k  
} `oo(\O7t=  
KR/SMwy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *7 >K"j  
{ -AU!c^-o  
 BOOL bAdded=FALSE; n7K\\|X  
 for(int index=0;index<MAX_KEY;index++){ +W9#^  
  if(hCallWnd[index]==0){ *|k/lI  
   hCallWnd[index]=hWnd; i fbO<  
   HotKey[index]=cKey; &(HIBF'O  
   HotKeyMask[index]=cMask; qW:\6aEG  
   bAdded=TRUE; &sJ%ur+G  
   KeyCount++; a,*~wmg  
   break; 1]Gp \P}  
  } UI.>BZ6}  
 } uSK<{UT~3  
 return bAdded; +46?+kKt  
} 3L(vZ2&  
z8hAZ?r1`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :HG5{zP  
{ rui]_Fn]I  
 BOOL bRemoved=FALSE; >vY5%%}  
 for(int index=0;index<MAX_KEY;index++){ j /=4f�  
  if(hCallWnd[index]==hWnd){ .[4Dv t|>6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >D/+04w  
    hCallWnd[index]=NULL; B>W!RyH8o  
    HotKey[index]=0; 2s:$4]K D  
    HotKeyMask[index]=0; }N<> z  
    bRemoved=TRUE; H:M;H =0  
    KeyCount--; xu7Q^F#u  
    break; S?Z"){  
   } vS'5Lm  
  } p-o!K\o-1  
 } L5yv}:.U  
 return bRemoved; VVyms7 VN  
} ~!{y3thZ  
ZJ|'$=lR  
void VerifyWindow() > H(o=39s  
{ vL"[7'  
 for(int i=0;i<MAX_KEY;i++){ fbK`A?5K  
  if(hCallWnd!=NULL){ LdM9k(  
   if(!IsWindow(hCallWnd)){ F[ 5\ x0  
    hCallWnd=NULL; gT~Yn~~b  
    HotKey=0; Bys_8x}  
    HotKeyMask=0; @fxDe[J:  
    KeyCount--;  @Iy&Qo  
   } )~l`%+  
  } 3fWL}]{<a  
 } h\i>4^]X.  
} ^w|apI~HSE  
c/G]r|k  
BOOL CHookApp::InitInstance() u$?t |Ll  
{ R3=]Av46  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Fxr$j\bm  
 hins=AfxGetInstanceHandle(); D27MT/=7  
 InitHotkey(); =Wj{J.7mf]  
 return CWinApp::InitInstance(); O}IRM|r"  
} V,CVMbn/%N  
Lk~aM bw#  
int CHookApp::ExitInstance() }\Mmp+<  
{ >'X[*:Cx  
 VerifyWindow(); 60 z =bd]  
 UnInit(); o|BEY3|  
 return CWinApp::ExitInstance(); To"J>:l  
} ir ^XZVR  
7D%}( pX  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a yQB@2%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k)l^ ;x-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oH|<(8efD  
#if _MSC_VER > 1000 .;xt{kK  
#pragma once AH#eoKu  
#endif // _MSC_VER > 1000 =whYo?cE(  
l@zr1g)  
class CCaptureDlg : public CDialog y=)xo7 (  
{ 9G@ J#vsqr  
 // Construction b];p/V# <  
 public: $M=W`E[g  
  BOOL bTray; {)8!>K%G  
  BOOL bRegistered; ]FLi^}ct  
  BOOL RegisterHotkey(); CUR70[pB)  
  UCHAR cKey; ?yq1\G)]  
  UCHAR cMask; .s !qf!{V`  
  void DeleteIcon(); eBW=bK~[VP  
  void AddIcon(); !w9w{dtW=  
  UINT nCount; ?A4t &4  
  void SaveBmp(); hh<Es|v  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor oJEUNgY&  
  // Dialog Data T$ )dc^  
  //{{AFX_DATA(CCaptureDlg) c$>$2[*=  
  enum { IDD = IDD_CAPTURE_DIALOG }; pjP R3 r  
  CComboBox m_Key; XeT{y]lkd  
  BOOL m_bControl; &m>sGCZ  
  BOOL m_bAlt; ?$#,h30  
  BOOL m_bShift; (7qdrAeP  
  CString m_Path; #K3`$^0 s  
  CString m_Number; >$yqx1=jW  
  //}}AFX_DATA DVWqrK}q  
  // ClassWizard generated virtual function overrides U- a+LS  
  //{{AFX_VIRTUAL(CCaptureDlg) hi30|^l-  
 public:  :nHa-N3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); pGO)9?j_N  
 protected: Dr!g$,9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?U`~,oI0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); RN%*3{-  
  //}}AFX_VIRTUAL ,'m<YTF  
  // Implementation *"pf3x6  
 protected: #H@rb  
  HICON m_hIcon;  H?(I-vO  
  // Generated message map functions &7YTz3aj  
  //{{AFX_MSG(CCaptureDlg) C& QT-|  
  virtual BOOL OnInitDialog(); [0(+E2/:2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u,R;=DNl  
  afx_msg void OnPaint(); z[I3k  
  afx_msg HCURSOR OnQueryDragIcon(); `;9Z?]}`  
  virtual void OnCancel(); 1%nE  
  afx_msg void OnAbout(); q)ns ui(  
  afx_msg void OnBrowse(); jd]YKaI  
  afx_msg void OnChange(); x]Nk T  
 //}}AFX_MSG |aT&rpt   
 DECLARE_MESSAGE_MAP() A80r@)i  
}; tX$ v)O|  
#endif #0WGSIht<  
Jmp%%^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /*+P}__k  
#include "stdafx.h" {Di()]/  
#include "Capture.h" Whd2mKwiO  
#include "CaptureDlg.h" H7 xyK  
#include <windowsx.h> $#k8xb  
#pragma comment(lib,"hook.lib") ]d}U68$T+  
#ifdef _DEBUG QyGTm"9l  
#define new DEBUG_NEW GYX/G>-r  
#undef THIS_FILE 8~=<!(M)m/  
static char THIS_FILE[] = __FILE__; 'TF5CNX  
#endif 0 2lI-xHe  
#define IDM_SHELL WM_USER+1 Vk/!_)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^rmcyy8;g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'V=i;2mB*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :q.g#:1s  
class CAboutDlg : public CDialog l1&NU'WW  
{ ;w/|5 ;{A;  
 public: NT^m.o~4  
  CAboutDlg(); ._uXK[c7P  
  // Dialog Data "lFS{7  
  //{{AFX_DATA(CAboutDlg) ^11y8[[  
  enum { IDD = IDD_ABOUTBOX }; 6i6m*=h  
  //}}AFX_DATA 9Dq^x&z(  
  // ClassWizard generated virtual function overrides P,|%7'?Y  
  //{{AFX_VIRTUAL(CAboutDlg) ]>33sb S6  
 protected: JfJLJ(}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [=})^t?8  
  //}}AFX_VIRTUAL ;PO{ ips  
  // Implementation c==5cMUg  
 protected: !&$uq|-  
  //{{AFX_MSG(CAboutDlg) _NfdJ=[Xh  
  //}}AFX_MSG \lJCBb+k  
  DECLARE_MESSAGE_MAP() w&vZ$n-|  
}; m M> L0  
]5V=kNu i  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dOm@cs  
{ +ld]P}  
 //{{AFX_DATA_INIT(CAboutDlg) yBJf'-K  
 //}}AFX_DATA_INIT g69^D  
} J-6l<%962%  
3N(5V;ti  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4@b~)av)  
{ yh  
 CDialog::DoDataExchange(pDX); (Q_J{[F  
 //{{AFX_DATA_MAP(CAboutDlg) ; S(KJV  
 //}}AFX_DATA_MAP K/Q%tr1W0  
} UP18?uM  
 T\(w}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H%LoI)w  
 //{{AFX_MSG_MAP(CAboutDlg) Ej\M e  
 // No message handlers qHZ!~Kq,"'  
 //}}AFX_MSG_MAP \F$Vm'f_  
END_MESSAGE_MAP() r9nyEzk  
" vW4"R6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H{}Nr 4  
: CDialog(CCaptureDlg::IDD, pParent) <sALA~p|0  
{ 7Rba@ cs9  
 //{{AFX_DATA_INIT(CCaptureDlg) "Je*70LG#  
  m_bControl = FALSE; fEdp^oVg  
  m_bAlt = FALSE; eSqKXmH[m  
  m_bShift = FALSE; Bb,l.w  
  m_Path = _T("c:\\"); 3Kx&+  
  m_Number = _T("0 picture captured."); =bx;TV  
  nCount=0; TpB4VNi/<  
  bRegistered=FALSE; #2/2X v  
  bTray=FALSE; zS9HR1  
 //}}AFX_DATA_INIT `b11,lg  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !mjrI "_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -`I&hzl6E  
} ^\ N@qL  
#~_ZG% u  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |61W-9;  
{ 5f~49(v]  
 CDialog::DoDataExchange(pDX); AYVkJq?  
 //{{AFX_DATA_MAP(CCaptureDlg) I"=a:q  
  DDX_Control(pDX, IDC_KEY, m_Key); c#ahFpsnlw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6njwrqo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); n A<#A  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c:J;Q){Xz  
  DDX_Text(pDX, IDC_PATH, m_Path); ii3{HJ*C  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \ah.@s  
 //}}AFX_DATA_MAP $QNII+o  
} (~6D`g`B  
W~!uSrY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lYF~CNvE  
//{{AFX_MSG_MAP(CCaptureDlg) W Ai91K@  
 ON_WM_SYSCOMMAND() d)R7#HLZ7  
 ON_WM_PAINT() CeZ+!-lG  
 ON_WM_QUERYDRAGICON() S'h{["P~ 0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1edeV48{:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IO@Ti(,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &y} ]^wB  
//}}AFX_MSG_MAP ^$!H|  
END_MESSAGE_MAP() TtWE:xE  
 dcd9AW=  
BOOL CCaptureDlg::OnInitDialog() +Fk]hCL  
{ {:63% j  
 CDialog::OnInitDialog(); iI]E%H}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); I+!?~]AUuq  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5x2m ]u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N!{waPbPi  
 if (pSysMenu != NULL) ,\DSi&T  
 { !,(6uO%  
  CString strAboutMenu; 8mmHefZ}2!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yUyx&Y/  
  if (!strAboutMenu.IsEmpty()) ![ce=9@t<  
  { [X\<C '<  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~+~^c|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )B!64'|M  
  } F?!X<N{  
 } 1.U9EuI  
 SetIcon(m_hIcon, TRUE); // Set big icon ndXUR4  
 SetIcon(m_hIcon, FALSE); // Set small icon RT~6#Caf  
 m_Key.SetCurSel(0); MYlPG1X=?  
 RegisterHotkey(); ta*6xpz-\Q  
 CMenu* pMenu=GetSystemMenu(FALSE); 2Hp<(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); A.v'ws+VDP  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Fv )H;1V  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s"xiGp9  
 return TRUE; // return TRUE unless you set the focus to a control )HL[_WfY  
} Mb1K:U  
NbyXi3@v  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7`G FtX}  
{ t0"2Si  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) b~u53   
 { x\R%hGt  
  CAboutDlg dlgAbout; \Wn0,%x2  
  dlgAbout.DoModal(); $Lc-}m9n  
 } "Yy)&zKr  
 else 4#fgUlV  
 { }vXf}2C  
  CDialog::OnSysCommand(nID, lParam); R#\o*Ta  
 } @((Y[<  
} mC,:.d  
2Sha&Z*CE  
void CCaptureDlg::OnPaint() &x#3N=c#  
{ k0e {c  
 if (IsIconic()) P'Gf7sQt7  
 { Q2 S!}A  
  CPaintDC dc(this); // device context for painting ? kBX:(g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YM`I&!n  
  // Center icon in client rectangle 5i eF8F%  
  int cxIcon = GetSystemMetrics(SM_CXICON); OngUZMgdb  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^rX5C2}G\D  
  CRect rect; V-N`R-FSr  
  GetClientRect(&rect); T:G8xI1 P  
  int x = (rect.Width() - cxIcon + 1) / 2; px~:'U  
  int y = (rect.Height() - cyIcon + 1) / 2; 8ED}!;ZU  
  // Draw the icon Es^=&2 ''  
  dc.DrawIcon(x, y, m_hIcon); Q\qI+F2?  
 } {*NM~yQ  
 else Z< 4Du  
 { +W}dO#  
  CDialog::OnPaint(); dSkx*#FEE  
 } 9N*!C{VW  
} X[;-SXq  
d+iV19#i  
HCURSOR CCaptureDlg::OnQueryDragIcon() +)06*"I  
{ #sJL"GB  
 return (HCURSOR) m_hIcon; ~1g)4g~  
} /f Ui2[y  
SbX#$; ks~  
void CCaptureDlg::OnCancel() *vS)aRK  
{ Tsc2;I  
 if(bTray) 5@/hqOiu  
  DeleteIcon(); 2$=I+8IL  
  CDialog::OnCancel(); zAA3bgaa  
} EA=EcUf'  
Pgh)+>ON  
void CCaptureDlg::OnAbout() kWm[Lt  
{ |-zefzD|  
 CAboutDlg dlg; ~]S%b3>  
 dlg.DoModal(); 8HxtmFqG  
} mzH3Q564  
&3~_9+  
void CCaptureDlg::OnBrowse() ;]A:(HSZj  
{ U+7!Vpq  
 CString str; hI}rW^o^  
 BROWSEINFO bi; Q!`  
 char name[MAX_PATH]; )ipTm{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); AY)R2> fW%  
 bi.hwndOwner=GetSafeHwnd(); z.6I6IfL\L  
 bi.pszDisplayName=name; Z-;I,\Y%  
 bi.lpszTitle="Select folder"; (! "+\KY  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; j#D( </T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .'Rz tBv  
 if(idl==NULL) ?'%9  
  return; sNbCOTow  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qV&ai{G:  
 str.ReleaseBuffer(); _fmOTz G  
 m_Path=str; y|h:{<  
 if(str.GetAt(str.GetLength()-1)!='\\') vIpitbFC  
  m_Path+="\\"; \ x>#bql+  
 UpdateData(FALSE); 227 Z6#CF!  
} 3Jj 3!aDB  
^oH!FN`;{  
void CCaptureDlg::SaveBmp() bQBYzvd  
{ yh{Wuz=T  
 CDC dc; 3+tr_psH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); m`B .3  
 CBitmap bm; US2Tdmy@05  
 int Width=GetSystemMetrics(SM_CXSCREEN); bG&vCH;}%  
 int Height=GetSystemMetrics(SM_CYSCREEN); c8}jO=/5+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nX\Q{R2  
 CDC tdc; A>Y!d9]ti  
 tdc.CreateCompatibleDC(&dc); 0?/vcsO  
 CBitmap*pOld=tdc.SelectObject(&bm); dePI&z:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2& ZoG%)  
 tdc.SelectObject(pOld); ?I}0[+)V  
 BITMAP btm; NWt5)xl  
 bm.GetBitmap(&btm); Ou,Eu05jt'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 68YJ@(iS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); y>iote~  
 BITMAPINFOHEADER bih; ^,,lo<d_L  
 bih.biBitCount=btm.bmBitsPixel; _ H$^m#h  
 bih.biClrImportant=0; P%_PG%O2p  
 bih.biClrUsed=0; yaWHGre  
 bih.biCompression=0; YM4njkI7  
 bih.biHeight=btm.bmHeight; Q ~>="Yiu  
 bih.biPlanes=1; T*v@hbJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); b _%W*Q  
 bih.biSizeImage=size; C=!YcJ9  
 bih.biWidth=btm.bmWidth; |p"4cG?)  
 bih.biXPelsPerMeter=0; M F_VMAq  
 bih.biYPelsPerMeter=0; O9jpt>:kZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); GJ P\vsaQ  
 static int filecount=0; fNNik7  
 CString name;  vgbk {  
 name.Format("pict%04d.bmp",filecount++); +x:-W0C:  
 name=m_Path+name; QoTjKck.  
 BITMAPFILEHEADER bfh; >7j(V`i"y  
 bfh.bfReserved1=bfh.bfReserved2=0; le.(KgRS4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bc ;(2D  
 bfh.bfSize=54+size; >^(Q4eU7!  
 bfh.bfOffBits=54; 3E`poE  
 CFile bf; yMCd5%=M\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <lFQ4<"m  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #`Gh8n#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Zg2F%f$Y  
  bf.WriteHuge(lpData,size); /Q*cyLv  
  bf.Close(); mvrg!/0w  
  nCount++; Yh 9fIRR  
 } D`fi\A  
 GlobalFreePtr(lpData); T*i rCe  
 if(nCount==1) w$)E#|i  
  m_Number.Format("%d picture captured.",nCount); 6z>Zm1h  
 else ?~fuMy B  
  m_Number.Format("%d pictures captured.",nCount); hY^-kdQ>M  
  UpdateData(FALSE); {nyVC%@Y  
} elw}(l<F  
E])X$:P?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WTZr{)e  
{ }2i3  
 if(pMsg -> message == WM_KEYDOWN) tW7*(D  
 { {nl4(2$  
  if(pMsg -> wParam == VK_ESCAPE) =`y.L5  
   return TRUE; RBM(>lU:  
  if(pMsg -> wParam == VK_RETURN) G>H',iOI  
   return TRUE; Kl)PF),  
 } "J(7fL$!  
 return CDialog::PreTranslateMessage(pMsg); T.R(  
} j@b18wZ  
2Y'=~*tV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y/aNrIK7  
{ H;nq4;^yK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6:o?@%  
  SaveBmp(); vJE>H4qPmD  
  return FALSE; JJe?Zu\  
} %U$PcHOo  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J;S@Q/s  
 CMenu pop; is,r:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]/C1pG*o  
 CMenu*pMenu=pop.GetSubMenu(0); yg-uL48q  
 pMenu->SetDefaultItem(ID_EXITICON); Tr@}  
 CPoint pt; SpG^kI #  
 GetCursorPos(&pt); )s';m$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9azk(OL6  
 if(id==ID_EXITICON) wtL_c  
  DeleteIcon(); cr_Q,*  
 else if(id==ID_EXIT) rBUdHd9  
  OnCancel(); Ikbz3]F^V  
 return FALSE; =W Q_5}  
} 0o+2]`q)Q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); USrg,A  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QA3q9,C"  
 AddIcon(); 3%$nRP X  
 return res; 0W1=9+c|X  
} 5lMm8<v  
.5PcprE/  
void CCaptureDlg::AddIcon() &bO0Rn1F  
{ xo46L\  
 NOTIFYICONDATA data; P{!r<N  
 data.cbSize=sizeof(NOTIFYICONDATA); c>*RQ4vE  
 CString tip; @'yD(ZMAz  
 tip.LoadString(IDS_ICONTIP); <r%QaQRbm  
 data.hIcon=GetIcon(0); s)~6 0c  
 data.hWnd=GetSafeHwnd(); '[h|f  
 strcpy(data.szTip,tip); ^KsiTVY  
 data.uCallbackMessage=IDM_SHELL; 5YG?m{hyn_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f/:XIG  
 data.uID=98; =Qcz:ng  
 Shell_NotifyIcon(NIM_ADD,&data); {t;{={$  
 ShowWindow(SW_HIDE); j+c<0,Kj  
 bTray=TRUE; h6dVT9  
} ^BruRgc+  
MOIH%lpe  
void CCaptureDlg::DeleteIcon() `<C/-Au  
{ B0^0d*8t|@  
 NOTIFYICONDATA data; B0KZdBRx}  
 data.cbSize=sizeof(NOTIFYICONDATA); 7xOrG],E  
 data.hWnd=GetSafeHwnd(); wER>a (  
 data.uID=98; '14 G0<;yL  
 Shell_NotifyIcon(NIM_DELETE,&data); 54Baz  
 ShowWindow(SW_SHOW); %-6I  
 SetForegroundWindow(); ]B<Hrnn  
 ShowWindow(SW_SHOWNORMAL); [V5ebj:6w  
 bTray=FALSE; bw8~p%l?  
} (Hcd{]M~  
&a>fZ^Y=k  
void CCaptureDlg::OnChange() x_JCH7-  
{ <[H1S@{W  
 RegisterHotkey(); f3+@u2Pv  
} f@R j;R~Jp  
( *(#;|m  
BOOL CCaptureDlg::RegisterHotkey() v [_C^;  
{ 0wLu*K5$4E  
 UpdateData(); d (Fb_  
 UCHAR mask=0; 7J]tc1-re  
 UCHAR key=0; Yd4J:  
 if(m_bControl) _M/ckv1q@  
  mask|=4; D-/K'|b  
 if(m_bAlt) 6BihZ|H04  
  mask|=2; X;7gh>Q'4  
 if(m_bShift) &cSTem 0  
  mask|=1; 4dXuy>Km  
  key=Key_Table[m_Key.GetCurSel()]; 2z7+@!w/  
 if(bRegistered){ );wSay>%(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^1vh5D  
  bRegistered=FALSE; 1@ )8E`u  
 } M%dXy^e  
 cMask=mask; JRkC~fv  
 cKey=key; b<de)MG  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;[]{O5TB  
 return bRegistered; ,c@^u6a  
} *v[WJ"8@  
gv}Esps R  
  四、小结 krPwFp2[*  
)QGj\2I  
  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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