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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: `P+(&taT  
  ANH4IYd3  
  一、实现方法 .V6-(d  
ZA#y)z8!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: ;@ WV-bLe  
RK9>dkW  
#pragma data_seg("shareddata") i`%.  
HHOOK hHook =NULL; //钩子句柄 47 u@4"M  
UINT nHookCount =0; //挂接的程序数目 j_?cpm{~ml  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 MWuXI1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |c-LSs'\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey A,~Hlw  
static int KeyCount =0; KiLvI,9y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1H:ea7YVU  
#pragma data_seg() ?SY<~i<K-  
nN`"z3o  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 |U[y_Y\a  
t\j!K2  
  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: Ri:p8  
c|wCKn}`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5!fSW2N  
cKey,UCHAR cMask) 0yof u  
{ ){Z  
 BOOL bAdded=FALSE; !"4w&bQ  
 for(int index=0;index<MAX_KEY;index++){ !awh*Xj6  
  if(hCallWnd[index]==0){ PN F4>)  
   hCallWnd[index]=hWnd; 1czG55 |  
   HotKey[index]=cKey; #!!AbuhzK{  
   HotKeyMask[index]=cMask; p?rK`$U+J  
   bAdded=TRUE; >M^&F6  
   KeyCount++; +!&$SNLh(  
   break; m% bE-#  
  } Md(JIlh3  
 } O4+F^+qN  
 return bAdded; SR*Gqx  
} |Mg }2!/L  
//删除热键 oW'PO Ar  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SfI*bJo>V  
{ <*@~n- R$  
 BOOL bRemoved=FALSE; 4UCwT1  
 for(int index=0;index<MAX_KEY;index++){ :4;S"p  
  if(hCallWnd[index]==hWnd){ cb+y9wA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r=csi  
    hCallWnd[index]=NULL; 1k>naf~O  
    HotKey[index]=0; Qyj(L[KJ  
    HotKeyMask[index]=0; M'u=H  
    bRemoved=TRUE; ?iln<% G  
    KeyCount--; $Xt;A&l2?  
    break; nUqy1(  
   } VN|G5*  
  } aW`dFitpM  
 } ]bfqcmh<  
 return bRemoved; w`#fH  
} E/"SU*Co  
 rA#s   
zUQe0Gc.b^  
  DLL中的钩子函数如下: 9-- dRTG  
3i(Jon/p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~L){O*Z  
{ t{ H 1u  
 BOOL bProcessed=FALSE;  4Iq5+Q  
 if(HC_ACTION==nCode) }N|\   
 { 5DSuUEvWcL  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 l:z };  
   switch(wParam) _?Ckq  
   {  E._hg+ (Hi  
    case VK_MENU: e?vj+ZlS$f  
     MaskBits&=~ALTBIT; [0op)Kn  
     break; 6H6Law!)  
    case VK_CONTROL: #01/(:7  
     MaskBits&=~CTRLBIT; qL>v&Rd<  
     break; >t,O2~  
    case VK_SHIFT: j]4,6` b\  
     MaskBits&=~SHIFTBIT; !OQuEJR  
     break; 0x4l5x$8  
    default: //judge the key and send message t[q3 {-  
     break; =SL^>HS.fo  
   } f\=6I3z  
   for(int index=0;index<MAX_KEY;index++){ 0lf"w@/  
    if(hCallWnd[index]==NULL) ]gHLcr3  
     continue; (-'PD_|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rT<1S?jR  
    { n531rkK-   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P|v ?  
     bProcessed=TRUE; "Y(%oJS]D  
    } rxArTpS{.#  
   } X_!$Pk7ma  
  } _;V YFs  
  else if((lParam&0xc000ffff)==1){ //有键按下 U-ULQ|6U  
   switch(wParam) |QMT A5  
   { Y}ky/?q  
    case VK_MENU: @QX4 \  
     MaskBits|=ALTBIT; 5 Af?Yxv  
     break; v'$ykZ!Z  
    case VK_CONTROL: uAQg"j  
     MaskBits|=CTRLBIT; 3m~U(yho  
     break; (Y>U6  
    case VK_SHIFT: X; 5S  
     MaskBits|=SHIFTBIT; ^:U;rHY  
     break; g.=!3e&z%  
    default: //judge the key and send message xNx`J@xt$  
     break; <@%ma2  
   } 8m \;P  
   for(int index=0;index<MAX_KEY;index++){ #-A5Z;TD.  
    if(hCallWnd[index]==NULL) E8 \\X  
     continue; wb@]>MJ}[s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6XZN>#  
    { .GtINhz*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6eOxF8  
     bProcessed=TRUE; )biX8yq hR  
    } iAg}pwU  
   } NrW[Q 3E$  
  } JfR kp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Zq9>VqGe  
   for(int index=0;index<MAX_KEY;index++){ 9/^d~ ZO  
    if(hCallWnd[index]==NULL) we @Yw6<  
     continue; y.%i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cx<h_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vDWr|M%``l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n/Or~@pHD  
   } MR[N6E6Mg  
  } 3!1&DII4  
 } 40rZ~!}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;\1b{-' l  
} 5,Qy/t}K  
p~ mN2x]  
  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: :0{AP_tvcC  
-<_+-t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Cnk#Ioz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '\4c "Ho  
n2H&t>N  
  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: t% <pbZO  
5BZ+b_A>VV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EwC5[bRjUp  
{ }`?7\\6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) IwOfZuS  
 { tP -5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 % 1OC#&  
  SaveBmp(); E`U &Z  
  return FALSE; tvv[$ b&  
 } ]Pz|Oi+]  
 …… //其它处理及默认处理 5Gc_LI&v7  
} F%9e@{  
lrq>TJEcx  
<d3PDO@w/  
  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。 `e4o1 *  
-Cg`x=G;z  
  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。 6hR^qdHg  
"K/[[wX\b  
  二、编程步骤 <aD'$(N5  
j0Id!o  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; xzuPie\  
tj`tLYOZ@-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; AEiWL.*.  
)zo#1$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; -9hp+0 <  
IS3e|o*]MP  
  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; \H},ou U  
g| _HcaW  
  5、 添加代码,编译运行程序。 ly9x1`?$  
L{4),65  
三、程序代码 <>ZBW9  
//ne']L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6:e}v'q{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =ip~J<sw&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;P 0,60  
#if _MSC_VER > 1000 z36brv<_'p  
#pragma once 0(Yh~{   
#endif // _MSC_VER > 1000 PT 0Qzg  
#ifndef __AFXWIN_H__ P]~N-xdV  
#error include 'stdafx.h' before including this file for PCH JNU"5sB  
#endif ,(1vEE[9-  
#include "resource.h" // main symbols PEOM1oY)w  
class CHookApp : public CWinApp ::^qy^n  
{ g] 7{ 5  
 public: lq78gOg{  
  CHookApp(); A52LH,  
  // Overrides /h.:br?M#P  
  // ClassWizard generated virtual function overrides 2ID*U d*  
  //{{AFX_VIRTUAL(CHookApp) p 02nd.R6  
 public: 0xvMR&.H  
  virtual BOOL InitInstance(); j3sz*:  
  virtual int ExitInstance(); s= -WB0E  
  //}}AFX_VIRTUAL e>ZbZy?  
  //{{AFX_MSG(CHookApp) Y&1!Z*OL;  
  // NOTE - the ClassWizard will add and remove member functions here. yhw:xg_;Kz  
  // DO NOT EDIT what you see in these blocks of generated code ! tS_xa  
  //}}AFX_MSG PU]7c2.y  
  DECLARE_MESSAGE_MAP() T2/v}  
}; sp=7Kh?|>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 42b=z//;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &UJ Ty'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .&* ({UM  
BOOL InitHotkey(); nsr _\F\  
BOOL UnInit(); l\A}lC0?J  
#endif b7>-aem@I  
9}'l=b:Jms  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (F4dFh  
#include "stdafx.h" On2Vf*G@|  
#include "hook.h" ]XpU'/h>q;  
#include <windowsx.h> F| ,Vw{  
#ifdef _DEBUG dctA`W@:-  
#define new DEBUG_NEW 6bA~mC^&  
#undef THIS_FILE y<'2BTf  
static char THIS_FILE[] = __FILE__; P}.yEta  
#endif K\Y6 cj  
#define MAX_KEY 100 w'5dk3$"  
#define CTRLBIT 0x04 |RvpEy7 6  
#define ALTBIT 0x02 Hm8EYPr J  
#define SHIFTBIT 0x01 =5s~$C  
#pragma data_seg("shareddata") $J;=Ux)$  
HHOOK hHook =NULL; $+)x)1  
UINT nHookCount =0; rt\<nwc  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey yo Q?lh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c-3YSrY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4%c7#AX[T  
static int KeyCount =0; J~yd]L>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;03*qOYc  
#pragma data_seg() Jb)eC?6O  
HINSTANCE hins; %8`1Li6g  
void VerifyWindow(); !!D:V`F/d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /="D]K)%b8  
//{{AFX_MSG_MAP(CHookApp) /S=;DxZ,r  
// NOTE - the ClassWizard will add and remove mapping macros here. 6&xW9' 6b:  
// DO NOT EDIT what you see in these blocks of generated code! )lngef /D_  
//}}AFX_MSG_MAP \PtC  
END_MESSAGE_MAP() &|&YRHv  
Q,M/R6i-  
CHookApp::CHookApp() J?,!1V=  
{ Spr:K,  
 // TODO: add construction code here, :xUl+(+  
 // Place all significant initialization in InitInstance #*;fQ&p  
}  "ppb%=  
nD?M;XN  
CHookApp theApp; 2zrWR%B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kvO`]>#;$?  
{ Wp9 2sm+  
 BOOL bProcessed=FALSE; !^"!fuoNC  
 if(HC_ACTION==nCode) 0.+Z;j  
 { <0,ah4C  
  if((lParam&0xc0000000)==0xc0000000){// Key up GzZ|T7fm  
   switch(wParam) (Ss77~W7  
   { f!R^;'a  
    case VK_MENU: f6_|dvY3  
     MaskBits&=~ALTBIT; aBtfZDCfzp  
     break; Bc"}nSjH  
    case VK_CONTROL: ]zR;%p  
     MaskBits&=~CTRLBIT; XGup,7e9  
     break; 0|+hm^'_  
    case VK_SHIFT: BO\`m%8md  
     MaskBits&=~SHIFTBIT; OaCj3d>  
     break; DSG +TA"  
    default: //judge the key and send message 4;~lpty  
     break; 2.L6]^N p(  
   } 63dtO{:4  
   for(int index=0;index<MAX_KEY;index++){ *p5T  
    if(hCallWnd[index]==NULL) 9oau _Q#  
     continue; AYQh=$)(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CH_Dat >  
    { h*X%:UbW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); . eag84_  
     bProcessed=TRUE; eRqexqO!  
    } ,["|wqM  
   } d~1"{WPSn  
  } 'N,NG$G2  
  else if((lParam&0xc000ffff)==1){ //Key down 6Oqnb+  
   switch(wParam) D30Z9_^%:  
   { %m\G'hY2  
    case VK_MENU: LVcy.kU@]  
     MaskBits|=ALTBIT; ppo$&W &z  
     break; H=SMDj)s+  
    case VK_CONTROL: :x5o3xE  
     MaskBits|=CTRLBIT; Pv$"DEXA2  
     break; 6g,3s?aT  
    case VK_SHIFT: d~bH!P  
     MaskBits|=SHIFTBIT; mbG^fy'  
     break; WF.$gBH"  
    default: //judge the key and send message 8_,wOkk_B  
     break; exMPw ;8  
   } y42T.oK8c  
   for(int index=0;index<MAX_KEY;index++) o6yZ@R  
   { O09g b[  
    if(hCallWnd[index]==NULL) C]cT*B^  
     continue; a ZCZ/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 27i<6PAC[A  
    { cw-JGqLx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V`&*%xgGR  
     bProcessed=TRUE; 6!PX! UkF  
    } ~ilBw:L-3  
   } M]zNW{Xt  
  } vh3iu +  
  if(!bProcessed){ Z42Suy  
   for(int index=0;index<MAX_KEY;index++){ [B;Ek \5W  
    if(hCallWnd[index]==NULL) -hV KPIb  
     continue; 8}b[Q/h!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b6M)qt9R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); HQj4h]O#  
   } :v ~q  
  } Pb&+(j  
 } %SFR.U0}yK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); EF{'J8AQ  
} p%tg->#L  
n& &U9sf?  
BOOL InitHotkey() L. ?dI82c  
{ >V=@[B(0  
 if(hHook!=NULL){ \5c -L_  
  nHookCount++; mK&9p{4#U  
  return TRUE; ,+evP=(cX  
 } ~TIZumGB  
 else `r$WInsDu  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); q)y8Bv|  
  if(hHook!=NULL) Pu*UZcXY  
   nHookCount++; zg Ti Az  
  return (hHook!=NULL); vK~KeZ\,p=  
} }r<^]Q*&p  
BOOL UnInit() o fv 1G=P  
{ LZ dNG\-  
 if(nHookCount>1){ hvZR4|k>  
  nHookCount--; @x ]^blq  
  return TRUE; l[{}ZKZ  
 } glIIJ5d|,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); XmR5dLc8  
 if(unhooked==TRUE){ cYS+XBz  
  nHookCount=0; k;X1x65uP  
  hHook=NULL; Lxrn#Z eM  
 } e:occT  
 return unhooked; wajhFBJ  
} '" yl>"  
z5w|+9U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =LA@E&,j  
{ fdHxrH >*  
 BOOL bAdded=FALSE; )uWNN"  
 for(int index=0;index<MAX_KEY;index++){ IQv>{h}  
  if(hCallWnd[index]==0){ W<l(C!{  
   hCallWnd[index]=hWnd;  #0H[RU?  
   HotKey[index]=cKey; 4tTJE<y  
   HotKeyMask[index]=cMask; :E*U*#h/  
   bAdded=TRUE; pdqh'+5  
   KeyCount++; Fowh3go  
   break; DJUtuex  
  } ~Wv?p4  
 } PCjY,O  
 return bAdded; F tjm@:X  
} i(rY'o2 BN  
^123.Ru|t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *h6i9V%'  
{ {*Pp^ r  
 BOOL bRemoved=FALSE; $S{j}74[  
 for(int index=0;index<MAX_KEY;index++){ s6uAF(4,  
  if(hCallWnd[index]==hWnd){ 4pv :u:Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K(S/D(\ FL  
    hCallWnd[index]=NULL; Y1IlH8+0  
    HotKey[index]=0; q#Vf2U55m  
    HotKeyMask[index]=0; O!tD1^O!1}  
    bRemoved=TRUE; _TF>c:m3  
    KeyCount--; Zlo,#q  
    break; ") D!OW]  
   } qC1@p?8$  
  } 9v0|lS!-  
 } Ea?.H Rxl  
 return bRemoved; Ags`%(  
} L4b4X  
g!ww;_  
void VerifyWindow() cK&oC$[r-  
{ = @o}  
 for(int i=0;i<MAX_KEY;i++){ 63=m11 Z4  
  if(hCallWnd!=NULL){ H;1}Nvvd  
   if(!IsWindow(hCallWnd)){ ;\N*iN#K  
    hCallWnd=NULL; $EF@x}h:A  
    HotKey=0; d .A0(*k,  
    HotKeyMask=0; M-Bw9`#Jw  
    KeyCount--; flqTx)xE  
   } 5@ug1F&   
  } wn&2-m*a  
 } mZyTo/\0  
} wQT'~'kL  
6* 7&X#gG  
BOOL CHookApp::InitInstance() h;->i]  
{ -yeT$P&|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ZI7<E  
 hins=AfxGetInstanceHandle(); )RFeF!("  
 InitHotkey(); Sqs`E[G*  
 return CWinApp::InitInstance(); x#D=?/~/Kv  
} 3 6 ;hg #  
"f_Z.6WMY  
int CHookApp::ExitInstance() a 2TC,   
{ intf%T5#  
 VerifyWindow(); P>|2~YxjU  
 UnInit(); hh9{md\  
 return CWinApp::ExitInstance(); #eYVZ=E  
} c+=&5=i[3  
WmA578|l!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <X?F :?Mk  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }JD(e}8$!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HdM;c*K  
#if _MSC_VER > 1000 tANG ]  
#pragma once / <p HDY  
#endif // _MSC_VER > 1000 0N.*c  
jTnu! H2o  
class CCaptureDlg : public CDialog /7^~*  
{ tF|bxXs Z  
 // Construction h.*|4;  
 public: (agdgy:#  
  BOOL bTray; Xc!w y9m  
  BOOL bRegistered; 3>+;G4  
  BOOL RegisterHotkey(); mX89^  
  UCHAR cKey; fvD wg  
  UCHAR cMask; *M:Bhw  
  void DeleteIcon(); DN+`Q{KS  
  void AddIcon(); Ju<D7  
  UINT nCount; AN@Vos Cu  
  void SaveBmp(); 0N xaQ`\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (Gcl,IW  
  // Dialog Data cc[w%jlA#  
  //{{AFX_DATA(CCaptureDlg) yWzTHW`)Mr  
  enum { IDD = IDD_CAPTURE_DIALOG }; &>o)7H];  
  CComboBox m_Key; :R)IaJ6)  
  BOOL m_bControl; DI_mF#5q  
  BOOL m_bAlt;  <CFu r  
  BOOL m_bShift; $dR%8@.H  
  CString m_Path; XebCl{HHp  
  CString m_Number; uT1x\Rt|e  
  //}}AFX_DATA _D~a4tgS  
  // ClassWizard generated virtual function overrides k{~5pxd-t  
  //{{AFX_VIRTUAL(CCaptureDlg) Gsb]e  
 public: {8' 5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ' vwBG=9C  
 protected: 6{M.S}.^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iaB5t<t1r  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); t`  Sh!e  
  //}}AFX_VIRTUAL U&6f}=v C  
  // Implementation :|a[6Uwl\V  
 protected: b7-a0zaN  
  HICON m_hIcon; )l=j,4nn  
  // Generated message map functions -8Ii QRS  
  //{{AFX_MSG(CCaptureDlg) v,jU9D \  
  virtual BOOL OnInitDialog(); [Mi~4b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Y3[@(  
  afx_msg void OnPaint(); {'1,JwSmb  
  afx_msg HCURSOR OnQueryDragIcon(); <6@Db$-  
  virtual void OnCancel(); >9 iv>  
  afx_msg void OnAbout(); KvQ9R!V  
  afx_msg void OnBrowse(); du !.j  
  afx_msg void OnChange(); "jSn`  
 //}}AFX_MSG *$QUE0  
 DECLARE_MESSAGE_MAP() 5J,vH  
}; \m<*3eS  
#endif PJ'l:IU  
B4kIcHA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O'k"6sBb  
#include "stdafx.h" b#sO1MXv  
#include "Capture.h"  ZM"t.  
#include "CaptureDlg.h" y3x_B@}BY  
#include <windowsx.h> w^~,M3(+)1  
#pragma comment(lib,"hook.lib") =6Z 1yw7s  
#ifdef _DEBUG [lf[J&}X  
#define new DEBUG_NEW m\(a{x  
#undef THIS_FILE w"~T5%p  
static char THIS_FILE[] = __FILE__; ek9%Xk8  
#endif e.N#+  
#define IDM_SHELL WM_USER+1 BsJClKp/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uZfo[_g0S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R#0UwRjeF  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; % n^]1R#  
class CAboutDlg : public CDialog #r\uh\Cy  
{ t4h* re+  
 public: uB\A8zC  
  CAboutDlg(); o\N),;LM  
  // Dialog Data 2n\EZ  
  //{{AFX_DATA(CAboutDlg) n'SnqJ&}  
  enum { IDD = IDD_ABOUTBOX }; $3So`8Bm[$  
  //}}AFX_DATA +p2)uXqW  
  // ClassWizard generated virtual function overrides .L}ar7  
  //{{AFX_VIRTUAL(CAboutDlg) WaYT\CG7y  
 protected: zQ6otDZx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %NvY~,  
  //}}AFX_VIRTUAL BwR)--75  
  // Implementation IMj{n.y4  
 protected: ;*8$BuD  
  //{{AFX_MSG(CAboutDlg) .k}h'nE  
  //}}AFX_MSG )/UkJ/}j  
  DECLARE_MESSAGE_MAP() Qk((H~I}  
}; d;`JDT  
dI`b AP;\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y@F{pr+dA  
{ !^y'G0  
 //{{AFX_DATA_INIT(CAboutDlg) \Q]7Hw<  
 //}}AFX_DATA_INIT N*eZ4s'  
} DUaj]V{_^  
KyjN'F$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0ZO!_3m$r  
{ /0A}N$?>:  
 CDialog::DoDataExchange(pDX); V[#jrwhA  
 //{{AFX_DATA_MAP(CAboutDlg) )gZ yW  
 //}}AFX_DATA_MAP WHL@]^E@m  
} qTG/7tn "  
\j4TDCs_[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e7-U0rrE  
 //{{AFX_MSG_MAP(CAboutDlg) _di[PU=Vh  
 // No message handlers -Wf 2m6t  
 //}}AFX_MSG_MAP )<%GHDWL  
END_MESSAGE_MAP() T{Av[>M  
LBTf}T\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iNcB6,++  
: CDialog(CCaptureDlg::IDD, pParent) BPW2WSm@<  
{ U2;_{n*g%  
 //{{AFX_DATA_INIT(CCaptureDlg) WmeV[iI  
  m_bControl = FALSE; {$Qw]?Yv  
  m_bAlt = FALSE; W 5-=,t  
  m_bShift = FALSE; Esd A %`  
  m_Path = _T("c:\\"); d4~!d>{n|c  
  m_Number = _T("0 picture captured."); )KG.:BO<  
  nCount=0;  3= PRe  
  bRegistered=FALSE; H8X{!/,^  
  bTray=FALSE; WOh?/F[@u  
 //}}AFX_DATA_INIT J%{>I   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QN":Qk(,q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r+>gIX+Fl  
} 0`:0m/fsU  
NbH;@R)L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q/I/>6M7UZ  
{ H>% K}Fh  
 CDialog::DoDataExchange(pDX); Pa+%H]vB  
 //{{AFX_DATA_MAP(CCaptureDlg) (V&$KDOA  
  DDX_Control(pDX, IDC_KEY, m_Key); ?g}G#j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,VI2dNst\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6YNd;,it>p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L\a G.\  
  DDX_Text(pDX, IDC_PATH, m_Path); J.$N<.  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EjrK.|I0  
 //}}AFX_DATA_MAP ^8OK.iC  
} \Cx2$<8  
3v\}4)A[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0 *2^joUv  
//{{AFX_MSG_MAP(CCaptureDlg) F P3{Rp  
 ON_WM_SYSCOMMAND() *|Tx4Qt  
 ON_WM_PAINT()  Vmt$]/  
 ON_WM_QUERYDRAGICON() EN^5 Hppb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JD9)Qelw^$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3%P<F>6 J  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {{qu:(_g  
//}}AFX_MSG_MAP p C^d-Ii  
END_MESSAGE_MAP() MaN6bM  
3s;^p,9 Y  
BOOL CCaptureDlg::OnInitDialog() *mby fu0q  
{ ;?4EVZ#o  
 CDialog::OnInitDialog(); }Y:V&4DW  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %g:6QS|  
 ASSERT(IDM_ABOUTBOX < 0xF000); FN\*x:g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Xh+;$2l.B  
 if (pSysMenu != NULL) Q WcQtM  
 { Zjd9@  
  CString strAboutMenu; R.(PZCvS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ir#]p9:x  
  if (!strAboutMenu.IsEmpty()) [>![ViX  
  { lha)4d  
   pSysMenu->AppendMenu(MF_SEPARATOR); #x*\dL  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~bf4_5  
  } H%pD9'q~  
 } 2{|Z?3FJ^  
 SetIcon(m_hIcon, TRUE); // Set big icon TXdo,DPv7  
 SetIcon(m_hIcon, FALSE); // Set small icon {.eo?dQ  
 m_Key.SetCurSel(0); *O_>3Hgl  
 RegisterHotkey(); >jz9o9?8  
 CMenu* pMenu=GetSystemMenu(FALSE); *+(rQ";x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %tB7 &%ut  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2ca#@??R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `3g5n:"g\  
 return TRUE; // return TRUE unless you set the focus to a control }k;wSp[3  
} 0RgE~x!hI  
:er(YWF:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F%P"T%|  
{ b+1!qNuCW#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1%ENgb:8  
 { L+N\B@ 0-  
  CAboutDlg dlgAbout; M0yv= g  
  dlgAbout.DoModal(); w p\-LO~  
 } Q p7h|<  
 else 1J([*)  
 { =WT&unw}  
  CDialog::OnSysCommand(nID, lParam); o%7-<\qS  
 } ,.Lwtp,n  
} ;.'?(iEB  
ulE5lG0c  
void CCaptureDlg::OnPaint() X!_&%^L'  
{ e>6|# d  
 if (IsIconic()) DL`8qJ'mJs  
 { IdqCk0lVD  
  CPaintDC dc(this); // device context for painting j"K^zh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eSQkW  
  // Center icon in client rectangle d~ +(g!  
  int cxIcon = GetSystemMetrics(SM_CXICON); _B>'07D0  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^"<x4e9+j  
  CRect rect; 'Lq+ONX5  
  GetClientRect(&rect); 4C/G &w&  
  int x = (rect.Width() - cxIcon + 1) / 2; d a<>a  
  int y = (rect.Height() - cyIcon + 1) / 2; (n`] sbx  
  // Draw the icon )(0if0D4  
  dc.DrawIcon(x, y, m_hIcon); `Fie'[F5,)  
 } `JO>g=,4  
 else DQ(0:r  
 { 7Xx3s@  
  CDialog::OnPaint(); n]df)a  
 } /poGhB 1k  
} |.VSw  
^s6}[LDW>@  
HCURSOR CCaptureDlg::OnQueryDragIcon() }4N'as/ZO  
{ 8OKG@hc  
 return (HCURSOR) m_hIcon; qg{gCG  
} 7HkFDI()1  
((C|&$@M  
void CCaptureDlg::OnCancel() Qo)Da}uo20  
{ v^ "qr?3V  
 if(bTray) GF6o  
  DeleteIcon(); $33E-^  
  CDialog::OnCancel(); n&Ckfo_D  
} /v^ '5j1o  
h;,1BpbM  
void CCaptureDlg::OnAbout() O 2-n-  
{ 6#7hMQ0&;O  
 CAboutDlg dlg; H1f='k]SZ  
 dlg.DoModal(); vn+XY =Qnr  
} >MJ#|vO  
E447'aJ  
void CCaptureDlg::OnBrowse() +q'\rpt  
{ b3EGtC}^  
 CString str; 'y\Je7  
 BROWSEINFO bi; ?HJh;96B  
 char name[MAX_PATH]; j*@@H6G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); jB8Q% {%  
 bi.hwndOwner=GetSafeHwnd(); ele@xl  
 bi.pszDisplayName=name; <Xl#}6II  
 bi.lpszTitle="Select folder"; 4^uSW&`;/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E{EO9EI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); KJRAW]?{  
 if(idl==NULL) & ?xR  
  return; Gsv<Rjj:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lhHH|~t0  
 str.ReleaseBuffer(); ydyTDn  
 m_Path=str; g]lEG>y1R  
 if(str.GetAt(str.GetLength()-1)!='\\') p;>A:i  
  m_Path+="\\"; u [._RA  
 UpdateData(FALSE); RI@\cJ\}  
} T/\RViG3  
y QClq{A  
void CCaptureDlg::SaveBmp() x>}ml\R  
{ =nHKTB>  
 CDC dc; i+h*<){X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >*RU:X  
 CBitmap bm; Hl`OT5 pNf  
 int Width=GetSystemMetrics(SM_CXSCREEN); `*Yw-HL  
 int Height=GetSystemMetrics(SM_CYSCREEN); UB.1xcI  
 bm.CreateCompatibleBitmap(&dc,Width,Height); UxL*I[z5  
 CDC tdc; 5X20/+aT  
 tdc.CreateCompatibleDC(&dc); qFD ZD)K  
 CBitmap*pOld=tdc.SelectObject(&bm); 3Rc*vVnI  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )[ A-d(y=  
 tdc.SelectObject(pOld); (iX8YP$%  
 BITMAP btm; !gve]>M  
 bm.GetBitmap(&btm); &cL1 EQ(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; z~#;[bER  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qtExd~E  
 BITMAPINFOHEADER bih; >x{("``D0y  
 bih.biBitCount=btm.bmBitsPixel; )GkJ%o#H2  
 bih.biClrImportant=0; T9 /;$6s*  
 bih.biClrUsed=0; cc|W1,q  
 bih.biCompression=0; 5E\.YqdV  
 bih.biHeight=btm.bmHeight; C3}:DIn"w  
 bih.biPlanes=1; >G:Q/3jh  
 bih.biSize=sizeof(BITMAPINFOHEADER); |tGUx*NN  
 bih.biSizeImage=size; 6N#hN)/  
 bih.biWidth=btm.bmWidth; U?#wWbE1  
 bih.biXPelsPerMeter=0; P9/ (f$=  
 bih.biYPelsPerMeter=0; tw_o?9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); moM? aYm  
 static int filecount=0; g}s$s}  
 CString name; Y~AjcqS  
 name.Format("pict%04d.bmp",filecount++); )O]6dd  
 name=m_Path+name; '{"Rjv7  
 BITMAPFILEHEADER bfh; V4+ |D2   
 bfh.bfReserved1=bfh.bfReserved2=0; #RBrii-,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); v>_@D@pr  
 bfh.bfSize=54+size; ;=y"Z^  
 bfh.bfOffBits=54; :j]1wp+  
 CFile bf; _#u\ar)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ K6kz{R%`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3>KEl^1DB  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8M99cx*K  
  bf.WriteHuge(lpData,size); wXKtQ#o}  
  bf.Close(); xU.1GI%UPu  
  nCount++; sp,-JZD  
 } (9Zvr4.f7  
 GlobalFreePtr(lpData); <y@v v  
 if(nCount==1) M7TLQqaF  
  m_Number.Format("%d picture captured.",nCount); 2!{D~Gfl=  
 else fB8, )&  
  m_Number.Format("%d pictures captured.",nCount); w\)K0RN  
  UpdateData(FALSE); 3YHEH\60^  
} BpZ~6WtBq  
lL}NiN-)t  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 'X;cgAq8(  
{ (`1i o  
 if(pMsg -> message == WM_KEYDOWN) G-d7}Uz ?  
 { hzo> :U  
  if(pMsg -> wParam == VK_ESCAPE) G?s9c0f  
   return TRUE; o;$xN3f,  
  if(pMsg -> wParam == VK_RETURN) 'JOUx_@z  
   return TRUE; ;7'O=%  
 } $Zu?Gd?  
 return CDialog::PreTranslateMessage(pMsg); +V4)><  
} #*o0n>O  
QTy=VLk43  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <T}^:2G|  
{ .nPOjwEx&Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ JOJ.79CT  
  SaveBmp(); XQo\27Fo  
  return FALSE; ;|q<t  
} C?\(?%B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \O5L#dc#  
 CMenu pop; Anz{u$0M[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qYK^S4L  
 CMenu*pMenu=pop.GetSubMenu(0); MgXZN{  
 pMenu->SetDefaultItem(ID_EXITICON); o701RG ~)  
 CPoint pt; csy6_q(  
 GetCursorPos(&pt); MTu\T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8ymdg\I+L  
 if(id==ID_EXITICON) BJjic%V  
  DeleteIcon(); ,"EaZ/Bl/  
 else if(id==ID_EXIT) 2lTt  
  OnCancel(); }J#HIE\RG  
 return FALSE; ]l,D,d81  
} "^#O7.oVi+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); " `qk}n-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) l77 -I:  
 AddIcon(); =A'>1N  
 return res; b j&!$')  
} 2FMmANH0ev  
riIubX#  
void CCaptureDlg::AddIcon() 0~U#DTx0  
{ \D@j`o  
 NOTIFYICONDATA data; Z[#8F&QV!m  
 data.cbSize=sizeof(NOTIFYICONDATA); JP>EW&M  
 CString tip; GHsDZ(d3.  
 tip.LoadString(IDS_ICONTIP); s<!A< +Sh  
 data.hIcon=GetIcon(0); \ lbH   
 data.hWnd=GetSafeHwnd(); 74([~Qs _M  
 strcpy(data.szTip,tip); |5^ iqW  
 data.uCallbackMessage=IDM_SHELL; C~&E7w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Gdow[x  
 data.uID=98; ),x0G*oebj  
 Shell_NotifyIcon(NIM_ADD,&data); s~Eo]e  
 ShowWindow(SW_HIDE); k=s^-Eiu  
 bTray=TRUE;  ``/L18  
} % !@E)%d0  
jj{:=l ZB  
void CCaptureDlg::DeleteIcon() p/{%%30ke  
{ In?rQiD9  
 NOTIFYICONDATA data; ^T&{ORWz  
 data.cbSize=sizeof(NOTIFYICONDATA); WsHD Ip  
 data.hWnd=GetSafeHwnd(); fEBi'Ad  
 data.uID=98; %r^tZ;; l  
 Shell_NotifyIcon(NIM_DELETE,&data); JN8Rh  
 ShowWindow(SW_SHOW); aT,WXW*  
 SetForegroundWindow(); 2XR!2_)O5  
 ShowWindow(SW_SHOWNORMAL); K*:=d }^  
 bTray=FALSE; T\gs  
} Fl)nmwO c  
%e:+@%]  
void CCaptureDlg::OnChange() EID-ROMO  
{ F$UL.`X _/  
 RegisterHotkey(); -b!?9T?}  
} RvR.t"8  
#N][-i  
BOOL CCaptureDlg::RegisterHotkey() #6M |T+ =  
{ 5Ew( 0K[  
 UpdateData(); 6 wN*d 5  
 UCHAR mask=0; T6/P54S  
 UCHAR key=0; U6-47m0%  
 if(m_bControl) ew\:&"@2]w  
  mask|=4; &b (*  
 if(m_bAlt) /` M#  
  mask|=2; ]WMzWt:L  
 if(m_bShift) ?= 7k<a~  
  mask|=1; }XUL\6U  
  key=Key_Table[m_Key.GetCurSel()]; wqG#jC!5  
 if(bRegistered){ &k'<xW?x  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,u}wW*?,sT  
  bRegistered=FALSE; + E{[j  
 } #w''WOk@ZG  
 cMask=mask; f>Rux1Je4  
 cKey=key; x_3B) &9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &$XTe2  
 return bRegistered; ? l~qb]._  
} :Quep-:fy<  
#H6YI3 `G  
  四、小结 )xVf3l pQ  
jG ouwta  
  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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