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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: s Zan.Kc#  
  24ojjxz+  
  一、实现方法 yfBVy8Sm  
\DP*?D_}?  
  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: )c'5M]V  
Ca: jN0  
#pragma data_seg("shareddata") x%acWeV5  
HHOOK hHook =NULL; //钩子句柄 *Q?ZJS ~  
UINT nHookCount =0; //挂接的程序数目 CM}1:o<<N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fl{wF@C6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o gcEv>0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !"*!du28jo  
static int KeyCount =0; =")}wl=s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <A"T_Rk  
#pragma data_seg() 7Z-'@m  
? o@5PL  
  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。  E*[dc  
;Up'+[Vj'C  
  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: ~m ,xG  
ZI'MfkEZ*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A]fN~PR  
cKey,UCHAR cMask) }gk37_}X\I  
{ l 8I`%bu  
 BOOL bAdded=FALSE; d$>TC(E=t  
 for(int index=0;index<MAX_KEY;index++){ YCJ6an  
  if(hCallWnd[index]==0){ rJ LlDKP-(  
   hCallWnd[index]=hWnd; }GIwYh/  
   HotKey[index]=cKey; XcoV27  
   HotKeyMask[index]=cMask; mv7><C  
   bAdded=TRUE; OnNWci|7  
   KeyCount++; `>M-J-J  
   break; m).S0  
  } "62vwWrwO  
 } 9:|z^r  
 return bAdded; AlW0GK=N-p  
} m/,.3v  
//删除热键 @ ;%+Ms  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Eei"baw/  
{ s}MD;V&0  
 BOOL bRemoved=FALSE; 1Sk=;Bic  
 for(int index=0;index<MAX_KEY;index++){ Yp_ L.TTb  
  if(hCallWnd[index]==hWnd){ C- Aiv@@<=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :]EAlaB4Q  
    hCallWnd[index]=NULL; 'j^A87\M_  
    HotKey[index]=0; up[9L|  
    HotKeyMask[index]=0; uFseO9F.2  
    bRemoved=TRUE; \)\uAI-  
    KeyCount--; LRF_w)^['  
    break; X<\E 'v`~  
   } !PQ%h/ix  
  } >]6f!;Rt  
 } :n'$Txf  
 return bRemoved; OE{{,HFa`G  
} "N"$B~W*  
9"KO!w  
q^:>sfd  
  DLL中的钩子函数如下: ~r<@`[-L  
l^.d 3b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g@IV|C( *0  
{  1 &24:&  
 BOOL bProcessed=FALSE; YCv)DW;  
 if(HC_ACTION==nCode) Tr}z&efY  
 { 6OBe^/ZRt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d~i WV6Va  
   switch(wParam) Vu @2  
   {  Gm,vLs9H$T  
    case VK_MENU: }2WscxL  
     MaskBits&=~ALTBIT; 81m3j`b  
     break; /RVy?)hVT#  
    case VK_CONTROL: ws"{Y+L  
     MaskBits&=~CTRLBIT; ~}uv4;0l]  
     break; @J`o pR  
    case VK_SHIFT: &h(>jY7b;  
     MaskBits&=~SHIFTBIT; do {E39  
     break; 'q158x  
    default: //judge the key and send message F.zx]][JV  
     break; _|f1q  
   } qOA+ao  
   for(int index=0;index<MAX_KEY;index++){ K U 2LJ_~Y  
    if(hCallWnd[index]==NULL) !+sC'/  
     continue; 4( Q_J4}P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4@2<dw|*h  
    { j7(sYo@x7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ` Aa}q(}k  
     bProcessed=TRUE; kF%EJuu  
    } U_s3)/'  
   } MQs!+Z"m>  
  } #Tc]L<."  
  else if((lParam&0xc000ffff)==1){ //有键按下 UL9]LEGG  
   switch(wParam) @vsgmz  
   { nWfzwXP>_  
    case VK_MENU: #'poDX?  
     MaskBits|=ALTBIT; z\S#P|;  
     break; #[ei/p  
    case VK_CONTROL: cyM9[X4rC  
     MaskBits|=CTRLBIT; eUBf-xA  
     break; _?]0b7X  
    case VK_SHIFT: wM$N#K@  
     MaskBits|=SHIFTBIT; `ChS$p"A  
     break; u|;?FQ$M  
    default: //judge the key and send message VI xGD#m  
     break; [&_7w\m  
   } RIhu9W   
   for(int index=0;index<MAX_KEY;index++){ JD`IPQb~E  
    if(hCallWnd[index]==NULL) 968<yO]  
     continue; {6*$yLWK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \,UpFuU\  
    { / .wO<l=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AnF"+<  
     bProcessed=TRUE; Sb2hM~  
    } ;jgk53lo  
   } _Y{8FN(4  
  } Hw0S/ytY  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |`T$Iq  
   for(int index=0;index<MAX_KEY;index++){ =`MxgK +  
    if(hCallWnd[index]==NULL) ae%Bl[  
     continue; u+5&^"72,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *5|;eN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YC!IIE_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .<m${yU{3  
   } fL^$G;_?3  
  } |IcA8[  
 } 0oNNEC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lEZODc+%Y  
} 6TR` O  
k.."_ 4  
  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: _4#Mdnh}[  
AvmI<U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'hoEdJ]t5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?-Qq\D^+  
YkN0,6  
  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: ^Z |WD!>`  
&i(\g7%U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }WowgY  
{ c-jE1y<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) A#o ~nC<  
 { zIzL7oD  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Y)O88C  
  SaveBmp(); ugu|?z*dI  
  return FALSE;  YW14X  
 } r,43 gg  
 …… //其它处理及默认处理 0hN gr'  
} T'ko =k  
/` ;rlH*  
;L*Ku'6Mt  
  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。 ]>9[}'u  
.4[\%r\i  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 _J,lF-,  
'?Jz8iu-  
  二、编程步骤 Z|#G+$"QV  
h tuYctu`  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; euMJ c  
#Dz. 58A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r"_U-w  
^g'P H{68  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5i0vli /L  
7DZZdH$Fm  
  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; YHp]O+c  
e0"80"D  
  5、 添加代码,编译运行程序。 ]lqe,>  
APJVD-  
三、程序代码 !MyCxM6  
9cIKi#Bl  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qg06*$%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ip+?k<]z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ L eu93f2  
#if _MSC_VER > 1000 RM3"8J  
#pragma once Z1~`S!(}  
#endif // _MSC_VER > 1000 l!*!)qCB(S  
#ifndef __AFXWIN_H__  &*Z"r*  
#error include 'stdafx.h' before including this file for PCH Z?f-_NHg  
#endif 9 df GV!Z  
#include "resource.h" // main symbols Q,LDn%+;B*  
class CHookApp : public CWinApp $=9g,39  
{ A4tb>O M  
 public: oazY?E]}3  
  CHookApp(); oWLv-{08  
  // Overrides ^Q#g-"b  
  // ClassWizard generated virtual function overrides B9: i.rQ  
  //{{AFX_VIRTUAL(CHookApp) 'PvOOhm,  
 public: Mp3nR5@d$  
  virtual BOOL InitInstance(); a7>^^?|  
  virtual int ExitInstance(); Wx`$hvdq  
  //}}AFX_VIRTUAL 8b[<:{[YB  
  //{{AFX_MSG(CHookApp) grxlGS~Q  
  // NOTE - the ClassWizard will add and remove member functions here. sTu]C +A  
  // DO NOT EDIT what you see in these blocks of generated code ! YXLZ2-%ohZ  
  //}}AFX_MSG Vv&GyqoO]  
  DECLARE_MESSAGE_MAP() x+bC\,q  
}; @@3%lr71   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w }=LC#le  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h:=W`(n5u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {+^&7JX  
BOOL InitHotkey(); Rn$TYCO  
BOOL UnInit(); ._[uSBR'  
#endif Zs|m_O G  
(:>Sh0.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. B%I<6E[D  
#include "stdafx.h" z7s}-w,  
#include "hook.h" j a'_syn  
#include <windowsx.h> |/%X8\  
#ifdef _DEBUG E#~J"9k98  
#define new DEBUG_NEW Ly-}HW(  
#undef THIS_FILE _Wtwh0[r*  
static char THIS_FILE[] = __FILE__; PVi0|  
#endif <xlyk/  
#define MAX_KEY 100 Tl L,dPM  
#define CTRLBIT 0x04 FL[,?RU?2  
#define ALTBIT 0x02 $ vBFs]h  
#define SHIFTBIT 0x01 tx$`1KA  
#pragma data_seg("shareddata") b?j\YX[e  
HHOOK hHook =NULL; bo-lT-I  
UINT nHookCount =0; |Sv}/ P-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `hDH7u!U.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT HE:]zH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (&1 56 5  
static int KeyCount =0; ckkm}|&m  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ID~}pEQ  
#pragma data_seg() HP,{/ $i:  
HINSTANCE hins; 4C }#lW9  
void VerifyWindow(); zwJ\F '  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /[I#3|  
//{{AFX_MSG_MAP(CHookApp) }2''}-Nc  
// NOTE - the ClassWizard will add and remove mapping macros here. 0V+v)\4FE  
// DO NOT EDIT what you see in these blocks of generated code! 3~\,VO''  
//}}AFX_MSG_MAP H}cq|hodn  
END_MESSAGE_MAP() b"y4-KV  
.wPI%5D  
CHookApp::CHookApp() {XH3zMk[  
{ /],9N  
 // TODO: add construction code here, +yxL}=4s  
 // Place all significant initialization in InitInstance b/d 1(B@  
} )C$pjjo/`  
T*%O\&'r  
CHookApp theApp; v+~O\v5Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =J`M}BBx  
{ `h~-  
 BOOL bProcessed=FALSE; bR<XQHl  
 if(HC_ACTION==nCode) fwi -   
 { %-L T56T  
  if((lParam&0xc0000000)==0xc0000000){// Key up c6cB {/g  
   switch(wParam) MDoV84Fh  
   { t]hfq~Ft  
    case VK_MENU: YJ}9VY<}1K  
     MaskBits&=~ALTBIT; t8ORfO+  
     break; @!*I mNMI  
    case VK_CONTROL: 9vBW CCf  
     MaskBits&=~CTRLBIT; GsoD^mjY  
     break;  V*W H  
    case VK_SHIFT: 4t 0p!IxG  
     MaskBits&=~SHIFTBIT; `(xzCRX  
     break; ]VaMulb4  
    default: //judge the key and send message )T@?.J`  
     break; Pp.] /;  
   } y\=^pla  
   for(int index=0;index<MAX_KEY;index++){ :Q}Zb,32  
    if(hCallWnd[index]==NULL) L]E.TvM1*  
     continue; oxug  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mM'uRhO+  
    { C6qGCzlG`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i)(-Ad_  
     bProcessed=TRUE; HfEl TC:3f  
    } =vsvx{o?  
   } (gUVZeVFP  
  } _QneaPm%  
  else if((lParam&0xc000ffff)==1){ //Key down Yv3 P]6c.  
   switch(wParam) !$p E=~1C  
   { %zN~%mJG  
    case VK_MENU: A]MX^eY  
     MaskBits|=ALTBIT; M4e8PRlI  
     break; sj&1I.@,>  
    case VK_CONTROL: z8j7K'vV1  
     MaskBits|=CTRLBIT; PnH5[4&k  
     break; P"|-)d  
    case VK_SHIFT: |Y30B,=M  
     MaskBits|=SHIFTBIT; '26 ,.1  
     break; !1#=j;N`  
    default: //judge the key and send message CUx-k|\  
     break; .ZupsS9l  
   } 1-.(pA'  
   for(int index=0;index<MAX_KEY;index++) 4veXg/l  
   { KB$Y8[  
    if(hCallWnd[index]==NULL) Qp-P[Tc  
     continue; ,"5xKF+cS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,U>G$G^  
    { 5}2148  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (8(P12l  
     bProcessed=TRUE; VuuF _y;  
    } oGL2uQXX  
   } l - ~PX  
  } MADt$_  
  if(!bProcessed){ S_;m+Ytg  
   for(int index=0;index<MAX_KEY;index++){ \*Z:w3;r  
    if(hCallWnd[index]==NULL) 5k;}I|rg%  
     continue; NYeL1h)l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dvLL~VP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =00 sB  
   } _Nf%x1m5s  
  } ,uZz?7mO  
 } |N|[E5Cn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); - H`, ` #{  
} j rg B56LL  
OpmPw4?}  
BOOL InitHotkey() EQX?Zs?C  
{ 8 -9<r  
 if(hHook!=NULL){ B3p79 j  
  nHookCount++; GmZ2a-M  
  return TRUE; JykNEMB#  
 } < Q6  
 else b<BkI""b  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); .#LHj}u  
  if(hHook!=NULL) W{t- UK   
   nHookCount++; Ci?RuZ"  
  return (hHook!=NULL); TlC? ?#  
} 5:T}C@  
BOOL UnInit() @DlN;r ?Cv  
{ rEj Ez+wu  
 if(nHookCount>1){ <-HWs@8#  
  nHookCount--; 0QBK(_O`  
  return TRUE; ^39 ?@xc@  
 } Mlo:\ST|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +<3e@s&  
 if(unhooked==TRUE){ ?Skv2!X|  
  nHookCount=0; ]:Pkh./  
  hHook=NULL; 1n#{c5T  
 } [pSQ8zdF"  
 return unhooked; w +HKvOs5c  
} *s?C\)x  
Fu65VLKh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hmI> 7@&  
{ %V92q0XW  
 BOOL bAdded=FALSE; uCj)7>}v{M  
 for(int index=0;index<MAX_KEY;index++){ 2,p= %  
  if(hCallWnd[index]==0){ IeB^BD+j  
   hCallWnd[index]=hWnd; V5+|H1=  
   HotKey[index]=cKey; 9L>ep&u)^  
   HotKeyMask[index]=cMask; uExYgI`<%&  
   bAdded=TRUE; [pz1f!Wn  
   KeyCount++; v"dl6%D"  
   break; 8< z   
  } 8|Wl|@1(  
 } c22L]Sxo  
 return bAdded; dl+c+w"  
} wdRk+  
>viLvDng  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o:@A%*jg  
{ X + B=?|M  
 BOOL bRemoved=FALSE; \n-.gG  
 for(int index=0;index<MAX_KEY;index++){ 2lxA/.f  
  if(hCallWnd[index]==hWnd){ Rc}#4pM8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L7N>p4h]Xj  
    hCallWnd[index]=NULL; Bb7Vf7>  
    HotKey[index]=0; gh% Q9Ni-  
    HotKeyMask[index]=0; T8Ye+eP}  
    bRemoved=TRUE; hmv*IF.  
    KeyCount--; D\  P-|}  
    break;  sM9NHwg  
   } sd |c/ayh~  
  } Q'rX]kk_  
 } W1[C/dDc  
 return bRemoved; 1(/rg  
} }LX.gm  
ki]i[cdk  
void VerifyWindow() A{gniYqvB`  
{ (!T\[6  
 for(int i=0;i<MAX_KEY;i++){ fKa]F`p_h  
  if(hCallWnd!=NULL){ VKy3tW/_&  
   if(!IsWindow(hCallWnd)){ SKVQ !^o  
    hCallWnd=NULL; Cil1wFBb  
    HotKey=0; F#|mN0op  
    HotKeyMask=0; xS_tB)C  
    KeyCount--; ;eP. B/N  
   } nDXy$f8  
  } Suk;##I  
 } RY~m Q  
} a'7RzN ,]  
rM20Y(|  
BOOL CHookApp::InitInstance() [UB]vPXm$  
{ M"8?XD%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); / 16 r_l  
 hins=AfxGetInstanceHandle(); cFoeyI#v  
 InitHotkey(); )>!y7/3  
 return CWinApp::InitInstance(); /%P,y+<}iG  
} \m+;^_;5GW  
hD7Lgi-N)W  
int CHookApp::ExitInstance() f1I/aRV:+  
{ da$ErN '{  
 VerifyWindow(); u7 {R; QKw  
 UnInit(); KvlLcE~`o  
 return CWinApp::ExitInstance(); !8o;~PPVl  
} 1P/4,D@  
IKnXtydeI}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file qhNYQ/uS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /z4n?&tM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8[u$CTl7a  
#if _MSC_VER > 1000 SOvo%L@  
#pragma once UeaHH]U  
#endif // _MSC_VER > 1000 l6-%)6u>  
j8?rMD~  
class CCaptureDlg : public CDialog Ki%RSW(_`  
{ OZno 3Hn  
 // Construction &DWSu`z  
 public: hFDo{yI  
  BOOL bTray; CoM?cS S  
  BOOL bRegistered; 9j$J}=y  
  BOOL RegisterHotkey(); s5oU  
  UCHAR cKey; yu=(m~KX   
  UCHAR cMask; Y NGS"3F  
  void DeleteIcon(); D=~3N  
  void AddIcon(); Ce_l\J8G  
  UINT nCount; 3$ BYfI3H  
  void SaveBmp(); h\*I*I8C  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }z_7?dn/  
  // Dialog Data KOD%>+vG$  
  //{{AFX_DATA(CCaptureDlg) Wq*W+7=.  
  enum { IDD = IDD_CAPTURE_DIALOG }; M;E$ ]Z9  
  CComboBox m_Key; d'b q#r  
  BOOL m_bControl; %~qY\>  
  BOOL m_bAlt; J\\o# -H  
  BOOL m_bShift; T$4Utd5[z'  
  CString m_Path; Bk~%  
  CString m_Number; jNP%BNd1f  
  //}}AFX_DATA 3!u:*ibt  
  // ClassWizard generated virtual function overrides eed!SmP  
  //{{AFX_VIRTUAL(CCaptureDlg) ]PZ\N~T  
 public: f_ UwIP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); I=}R Z9  
 protected:  X&.LX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hi9@U]H#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); i}Cy q  
  //}}AFX_VIRTUAL gv9z`[erS  
  // Implementation tCr? !Y~  
 protected: jUy$aGX  
  HICON m_hIcon; [2nPr^  
  // Generated message map functions (J`EC  
  //{{AFX_MSG(CCaptureDlg) Eo_; N c  
  virtual BOOL OnInitDialog(); Ml9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); J.n-4J#@  
  afx_msg void OnPaint(); i UW.$1l  
  afx_msg HCURSOR OnQueryDragIcon(); G0v<`/|>}  
  virtual void OnCancel(); sQ%gf  
  afx_msg void OnAbout(); K?acRi  
  afx_msg void OnBrowse(); S$ 91L  
  afx_msg void OnChange(); Z;J{&OJ3qM  
 //}}AFX_MSG (c9!:  
 DECLARE_MESSAGE_MAP() @]B 7(j<'R  
}; <k-hRs2d  
#endif $|}PL[aA#  
}B2qtb3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |BA<> WE  
#include "stdafx.h" >y iE}  
#include "Capture.h" kB ;!EuL  
#include "CaptureDlg.h" of?0 y-LT%  
#include <windowsx.h> FY<77i  
#pragma comment(lib,"hook.lib") xi"Ug41)  
#ifdef _DEBUG =idZvD  
#define new DEBUG_NEW "6o5x&H  
#undef THIS_FILE C/A~r  
static char THIS_FILE[] = __FILE__; #nJ&`woZt  
#endif JbEQ35r  
#define IDM_SHELL WM_USER+1 is}Y+^j.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [Xo}CU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  FK|q*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F(;C \[Ep  
class CAboutDlg : public CDialog KVCj06}j  
{ gD/% l[  
 public: 6O'6,%#  
  CAboutDlg(); cY[qX/0~  
  // Dialog Data F9 C3i  
  //{{AFX_DATA(CAboutDlg) ;n=A245W\  
  enum { IDD = IDD_ABOUTBOX }; ob"yz}  
  //}}AFX_DATA _ hs\"W  
  // ClassWizard generated virtual function overrides D``>1IA]  
  //{{AFX_VIRTUAL(CAboutDlg) O,?aVgY  
 protected: - WK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g'1ASMuR  
  //}}AFX_VIRTUAL \9s x_T  
  // Implementation -87]$ ax  
 protected: rgXD>yu(  
  //{{AFX_MSG(CAboutDlg) K^+}__;]  
  //}}AFX_MSG q. NvwJ  
  DECLARE_MESSAGE_MAP() ,N`D{H"F  
}; M[,G#GO  
z+6%Ya&ls  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) DU1\K  
{ Gu@Znh-D  
 //{{AFX_DATA_INIT(CAboutDlg) bdkxCt  
 //}}AFX_DATA_INIT 1PjqXgN5p  
} `d. 4 L.],  
LjMhPzCp  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |!H@{o  
{ }?XNA.Wz  
 CDialog::DoDataExchange(pDX); n 0CS =  
 //{{AFX_DATA_MAP(CAboutDlg) r&c31k]E  
 //}}AFX_DATA_MAP Z7Xic5PI{4  
} eFdN"8EW  
WHvU|rJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \Yd 0oe82  
 //{{AFX_MSG_MAP(CAboutDlg) p) ea1j>N  
 // No message handlers TkSeDP  
 //}}AFX_MSG_MAP (k&r^V/=  
END_MESSAGE_MAP() 7T}r]C.  
o!ycVY$yW  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) C#4/~+  
: CDialog(CCaptureDlg::IDD, pParent) caC( KK#<  
{ vQIN#;m4  
 //{{AFX_DATA_INIT(CCaptureDlg) Qv>rww]  
  m_bControl = FALSE; IYk^eG:;  
  m_bAlt = FALSE; 5D%gDw+"  
  m_bShift = FALSE; qmM%MPv  
  m_Path = _T("c:\\"); !_SIq`5]@  
  m_Number = _T("0 picture captured."); ;l>C[6]  
  nCount=0; W^AY:#eX~Q  
  bRegistered=FALSE; \w+a Q?e_  
  bTray=FALSE; nH % 1lD?:  
 //}}AFX_DATA_INIT y OLqIvN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BbdJR]N/!h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &i%1\ o  
} ccu13Kr>E  
+1 j+%&).  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) njN]0l{p  
{ mtn+bV R%  
 CDialog::DoDataExchange(pDX); %:WM]dc  
 //{{AFX_DATA_MAP(CCaptureDlg) EU"J'?  
  DDX_Control(pDX, IDC_KEY, m_Key); CiSl 0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Yab=p 9V;;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~ GW8|tw  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "~HV!(dRMC  
  DDX_Text(pDX, IDC_PATH, m_Path); '{(/C?T  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xMAb=87_  
 //}}AFX_DATA_MAP Om=*b#k  
} Zc9j_.?*  
dn)pVti_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }^R_8{>k  
//{{AFX_MSG_MAP(CCaptureDlg) Jf{ M[ z  
 ON_WM_SYSCOMMAND() r(::3TF%#q  
 ON_WM_PAINT() --9Z  
 ON_WM_QUERYDRAGICON() Nu%:7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hfuGCD6F`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'N?t=A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @ dF]X  
//}}AFX_MSG_MAP g2'Q)w  
END_MESSAGE_MAP() t[-0/-4  
HAr_z@#E  
BOOL CCaptureDlg::OnInitDialog() x6c#[:R&  
{ <7%4=  
 CDialog::OnInitDialog(); p~xrl jP$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :xP$iEA`G  
 ASSERT(IDM_ABOUTBOX < 0xF000); w(xRL#%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N2x!RYW  
 if (pSysMenu != NULL) Vt!<.8&`  
 { _noQk3N  
  CString strAboutMenu; \"u3 x.!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); A->y#KQ  
  if (!strAboutMenu.IsEmpty()) 'F[ C 4  
  { }&mFpc  
   pSysMenu->AppendMenu(MF_SEPARATOR); ef;Ta|#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ttK`*Ng  
  } X) TUKt  
 } KZxA\,Y'5  
 SetIcon(m_hIcon, TRUE); // Set big icon _,i+gI[  
 SetIcon(m_hIcon, FALSE); // Set small icon 5@{+V!o,  
 m_Key.SetCurSel(0); Mn=5yU  
 RegisterHotkey(); +.b@rU6H  
 CMenu* pMenu=GetSystemMenu(FALSE); 23;e/Qr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); BOQeP/>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _2,eS[wP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <?I s~[2  
 return TRUE; // return TRUE unless you set the focus to a control u70-HFI@  
} [8K+  zT5  
v8`)h<:W?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l< y9ue=  
{ *I(g~p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (cj3[qq  
 { (3=(g  
  CAboutDlg dlgAbout; P;dp>jL  
  dlgAbout.DoModal(); .u_k?.8|  
 } XFg.Z+ #  
 else 0kD8wj%  
 { P"g Y|}|  
  CDialog::OnSysCommand(nID, lParam); CY4_=  
 } |=frsf~?  
} ;|hEXd?b  
B !(t<W8cu  
void CCaptureDlg::OnPaint() ffQ%GV_  
{ BU="BB/[  
 if (IsIconic())  yq ?_#r  
 { _0rHxh7}q  
  CPaintDC dc(this); // device context for painting GD$jP?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2 8j=q-9Z  
  // Center icon in client rectangle `37GVo4  
  int cxIcon = GetSystemMetrics(SM_CXICON); | 3`qT#p{  
  int cyIcon = GetSystemMetrics(SM_CYICON); ; YaR|)B  
  CRect rect; }bv0~}G4  
  GetClientRect(&rect); 7 \ <4LX  
  int x = (rect.Width() - cxIcon + 1) / 2; Z`?<Ada  
  int y = (rect.Height() - cyIcon + 1) / 2; q-.e9eoc\  
  // Draw the icon !vQ!_|g1  
  dc.DrawIcon(x, y, m_hIcon); x Qh?  
 } S%ri/}qI[{  
 else h]94\XQ>$  
 { rI:KZ}GZ  
  CDialog::OnPaint(); k"P2J}4eO  
 } F$K-Q;r]<  
} Zw5\{Z0  
9rb/hkX&  
HCURSOR CCaptureDlg::OnQueryDragIcon() T$]2U>=<J  
{ T2wn!N?r  
 return (HCURSOR) m_hIcon;  afEp4(X~  
} W7a s =+;X  
-?b@6U  
void CCaptureDlg::OnCancel() >EMgP1  
{ 1q!JpC^  
 if(bTray) f=}Mr8W'  
  DeleteIcon(); *x| <\_+  
  CDialog::OnCancel(); L!L/QG|wdf  
} DJE/u qE  
wS2iyrIB  
void CCaptureDlg::OnAbout() >:]fN61#  
{ \QUvImT  
 CAboutDlg dlg; ,h2q 37  
 dlg.DoModal(); =3=KoH/'  
} !v2,lH  
 hh"0z]  
void CCaptureDlg::OnBrowse() LeW.uh3.  
{ qD\%8l.]Z  
 CString str; (nrrzOax  
 BROWSEINFO bi; co3H=#2a  
 char name[MAX_PATH]; 4(4JQ(5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); =tcPYYD  
 bi.hwndOwner=GetSafeHwnd(); *eXO?6f%s^  
 bi.pszDisplayName=name; ^c]Sl  
 bi.lpszTitle="Select folder"; 2LYd # !i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZZC= 7FB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dW7dMx  
 if(idl==NULL) Z-<v5aF  
  return; YeJ95\jf  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g]xZ^M+  
 str.ReleaseBuffer(); ~,e!t.339  
 m_Path=str; t%z7#}9$  
 if(str.GetAt(str.GetLength()-1)!='\\') IQ{Xj3;?y  
  m_Path+="\\"; V8&/O)}o  
 UpdateData(FALSE); MatC2-aV1  
} bT-G<h*M  
(?\ZN+V)  
void CCaptureDlg::SaveBmp() gE=~.P[ZX  
{ cM4?G gn  
 CDC dc; \|>eG u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^qbX9.\  
 CBitmap bm; +$>ut r  
 int Width=GetSystemMetrics(SM_CXSCREEN); :,q3?l6  
 int Height=GetSystemMetrics(SM_CYSCREEN); Q]xW}5 /  
 bm.CreateCompatibleBitmap(&dc,Width,Height); QBsDO].J<  
 CDC tdc; w#mnGD  
 tdc.CreateCompatibleDC(&dc); sW2LNE  
 CBitmap*pOld=tdc.SelectObject(&bm); `^J~^Z7Y-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %Y Rg1UKY  
 tdc.SelectObject(pOld); 0D#!!r ;  
 BITMAP btm; &`L5UX  
 bm.GetBitmap(&btm); s*CKFEb#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K=5_jE^e  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vB4cdW 2#3  
 BITMAPINFOHEADER bih; ap%o\&T;  
 bih.biBitCount=btm.bmBitsPixel; ]bnxOk  
 bih.biClrImportant=0; Y)u} +Yg  
 bih.biClrUsed=0; z3*G(,  
 bih.biCompression=0; =w A< F  
 bih.biHeight=btm.bmHeight; 0v7;Z xD  
 bih.biPlanes=1; 2K*-uT#$~  
 bih.biSize=sizeof(BITMAPINFOHEADER); IVNNiNN*5  
 bih.biSizeImage=size; paBGJ~{=  
 bih.biWidth=btm.bmWidth; el|t6ZT*  
 bih.biXPelsPerMeter=0; ~POeFZ  
 bih.biYPelsPerMeter=0; ^}1RDdQ"U  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); oh@r0`J]x  
 static int filecount=0; 3`9*Hoy0c  
 CString name; PYHm6'5BtB  
 name.Format("pict%04d.bmp",filecount++); $PS5xD~@  
 name=m_Path+name; x#8=drh.:C  
 BITMAPFILEHEADER bfh; ,t+ATaOF  
 bfh.bfReserved1=bfh.bfReserved2=0; r3j8[&B"  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )vU{JY;  
 bfh.bfSize=54+size; Ic=V:  
 bfh.bfOffBits=54; H+5]3>O-$  
 CFile bf; aY:(0en]&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k13/yiv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?ha}&##  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VvF&E>f C  
  bf.WriteHuge(lpData,size); Na~_=3+a  
  bf.Close(); wO!hVm,T a  
  nCount++; Y!7P>?)`,X  
 } k(qQvn  
 GlobalFreePtr(lpData); g?$9~/h :;  
 if(nCount==1) }"&(sYQ*`  
  m_Number.Format("%d picture captured.",nCount); Ro1' L1:  
 else  ^,KR0  
  m_Number.Format("%d pictures captured.",nCount); *Yr-:s9J9  
  UpdateData(FALSE); xY'g7<})$  
} ,xh9,EpBk  
&vF"I'V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )(L&+DDy  
{ H0(zE *c~  
 if(pMsg -> message == WM_KEYDOWN) Fp]8f&l8  
 { -.*\J|S@g  
  if(pMsg -> wParam == VK_ESCAPE) a ;S^<8  
   return TRUE; UUU^YT \  
  if(pMsg -> wParam == VK_RETURN) C95,!q  
   return TRUE; |TUpv*pq  
 } KFs` u6  
 return CDialog::PreTranslateMessage(pMsg); Q~@8t"P  
} 9bNIaC*M  
G2^DukK.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VDPN1+1*  
{ z>0"T2W y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y*(YZzF  
  SaveBmp(); ]s -6GT  
  return FALSE; K`X2N  
} ww,c)$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |@g1|OWd|  
 CMenu pop; 5->PDp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); OX`n`+^D  
 CMenu*pMenu=pop.GetSubMenu(0); jF;4 8g@^  
 pMenu->SetDefaultItem(ID_EXITICON); $F-XXBp  
 CPoint pt; H\k5B_3OU  
 GetCursorPos(&pt); >eTlew<5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CbHNb~  
 if(id==ID_EXITICON) :9YQX(l8  
  DeleteIcon(); -0X> y  
 else if(id==ID_EXIT) )mPlB.  
  OnCancel(); -&EmEXs%  
 return FALSE; z )pV$  
} I7~|!d6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =z3jFaZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) op-#Ig$#  
 AddIcon(); /)I9+s#q9o  
 return res; vvM)Rb,  
} hjG1fgEj  
}gW}Vr <  
void CCaptureDlg::AddIcon() 7asq]Y}<  
{ XJzXxhk2  
 NOTIFYICONDATA data; ".)_kt[  
 data.cbSize=sizeof(NOTIFYICONDATA); %yMzgk[u  
 CString tip; `-H:j:U{  
 tip.LoadString(IDS_ICONTIP); YzZF^q^I  
 data.hIcon=GetIcon(0); .HBvs=i  
 data.hWnd=GetSafeHwnd(); f$>orVm%.  
 strcpy(data.szTip,tip); m#nxw  
 data.uCallbackMessage=IDM_SHELL; E%^28}dN  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yx2.7h3  
 data.uID=98; 4B]61|A  
 Shell_NotifyIcon(NIM_ADD,&data); 6\3k0z  
 ShowWindow(SW_HIDE); eC$v0Gtq  
 bTray=TRUE; F&*M$@u5  
} &FrB6 y  
K8J2eV\  
void CCaptureDlg::DeleteIcon() ~&}O|B()  
{ /=@vG Vp6  
 NOTIFYICONDATA data; %&Cl@6  
 data.cbSize=sizeof(NOTIFYICONDATA); _o.Z`]  
 data.hWnd=GetSafeHwnd();  {K9E% ,w  
 data.uID=98; c Vn+~m_%  
 Shell_NotifyIcon(NIM_DELETE,&data); gxOmbQt@;  
 ShowWindow(SW_SHOW); W\,lII0  
 SetForegroundWindow(); >u)ZT  
 ShowWindow(SW_SHOWNORMAL); JC"K{ V{  
 bTray=FALSE; )!d1<p3  
} s.sy7%{  
9>R|k$`  
void CCaptureDlg::OnChange() 6EU4  
{ ' D&G~$  
 RegisterHotkey(); Qm#i"jvV  
} #'x?) AS  
WQpJd7  
BOOL CCaptureDlg::RegisterHotkey() {_Qxe1^g  
{ 1J"9r7\  
 UpdateData(); -YV4  O  
 UCHAR mask=0; X=pt}j,QrP  
 UCHAR key=0; !)3s <{k#  
 if(m_bControl) cf'}*$[S  
  mask|=4; 8uxFXQ  
 if(m_bAlt) qm=F6*@}  
  mask|=2; +&,\ J9'B  
 if(m_bShift) PAwg&._K  
  mask|=1; 6\Vu#r  
  key=Key_Table[m_Key.GetCurSel()]; MNqyEc""  
 if(bRegistered){ g u =fq\`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \hW73a!  
  bRegistered=FALSE; ]zU<=b@  
 } Sqf.#}u<=  
 cMask=mask; KN:dm!A  
 cKey=key; :EwA$`/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %_MR.J+m2  
 return bRegistered; oRThJB  
} }AW)R&m  
}pnFJ  
  四、小结 xqWrW)  
|/^aL j^u  
  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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