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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: *Ee# x!O  
  %~[F^  
  一、实现方法 TP^0`L  
>y@w-,1he  
  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: ={oO9.9  
M;bQid@BG  
#pragma data_seg("shareddata") ;g*6NzdA  
HHOOK hHook =NULL; //钩子句柄 !14z4]b  
UINT nHookCount =0; //挂接的程序数目 DQ}]'*@?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /L 4WWQ5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f<'C<xnf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N!3f1d7RQ  
static int KeyCount =0; mZbWRqP[|_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %R.xS} Q  
#pragma data_seg() {ywXz|TP  
%qS]NC  
  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。 $>'")7z  
GP[6nw_'^  
  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: aJ5H3X}Y  
${eY9-r_%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?~aZ#%*i8  
cKey,UCHAR cMask) *3_f &Y  
{ B]^>GH  
 BOOL bAdded=FALSE; "K|)<6J  
 for(int index=0;index<MAX_KEY;index++){ 5!'R'x5e  
  if(hCallWnd[index]==0){ pKt-R07*  
   hCallWnd[index]=hWnd; Qy=HrL]x  
   HotKey[index]=cKey; =y< ">-  
   HotKeyMask[index]=cMask; &jV9*  
   bAdded=TRUE; ;dqk@@O"(  
   KeyCount++; uFwU-LCe  
   break; c Ndw9?Z  
  } G3RrjWtO  
 } On{~St'V  
 return bAdded; DR k]{^C~  
} ^Yj"RM$;N  
//删除热键 AIZW@Nq.5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g d337jw  
{ `6a]|7|f  
 BOOL bRemoved=FALSE; I86e&"40  
 for(int index=0;index<MAX_KEY;index++){ "sF Xl  
  if(hCallWnd[index]==hWnd){ rQ9*J   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5/& 1Oxo  
    hCallWnd[index]=NULL; -"W)|oC_  
    HotKey[index]=0; UF@IBb}0  
    HotKeyMask[index]=0; 6m4Te|  
    bRemoved=TRUE; H4M{_2DO  
    KeyCount--; I"Q#IvNw  
    break; [f<"p[  
   } q1YLq(e  
  } oi7 3YOB  
 } K!3{M!B   
 return bRemoved; M'yO+bu  
} blJIto '  
MV%Xhfk  
)-=2w-ZX  
  DLL中的钩子函数如下: {mNdL J  
"XCU'_k=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }qer   
{ {IJ-4>  
 BOOL bProcessed=FALSE; C&=x3Cz  
 if(HC_ACTION==nCode) BjM+0[HC  
 { Ci;h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xTW3UY  
   switch(wParam) N<9w{zIK(  
   {  "Dyym<J  
    case VK_MENU: d i!"IQAvK  
     MaskBits&=~ALTBIT; Tdg6kkJ  
     break; vFTXTbt'h  
    case VK_CONTROL: iJ}2"i7M  
     MaskBits&=~CTRLBIT; YzVN2f!n  
     break; m7JPH7P@BM  
    case VK_SHIFT: h ~ $&  
     MaskBits&=~SHIFTBIT; _-n Y2)  
     break; -  $%jb2  
    default: //judge the key and send message kEO1TS  
     break; aC`Li^  
   } ~%`EeJwT  
   for(int index=0;index<MAX_KEY;index++){ MFv Si  
    if(hCallWnd[index]==NULL) DB#$~(o  
     continue; djUihcqA`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B$ui:R/ t  
    { /mc*Hc 8R8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s}wO7Df=+  
     bProcessed=TRUE; d>&\V)E  
    } D}MoNE[r  
   } 0{Bf9cH  
  } V"O 9n[|  
  else if((lParam&0xc000ffff)==1){ //有键按下 *|oPxQCtK  
   switch(wParam) cv= \g Z  
   { D3y>iQd   
    case VK_MENU: o5P&JBX<  
     MaskBits|=ALTBIT; r&SO:#rOSM  
     break; 6J\q`q(W(  
    case VK_CONTROL: pw=F' Y@N  
     MaskBits|=CTRLBIT; q3+I<qsAz  
     break; pajy#0 U  
    case VK_SHIFT: UxeL cUP  
     MaskBits|=SHIFTBIT; k52QaMKa~A  
     break; `NQ{)N0!  
    default: //judge the key and send message 7aQ n;  
     break; to'j2jP  
   } 7,h3V=^)Q  
   for(int index=0;index<MAX_KEY;index++){ U+} y %3l  
    if(hCallWnd[index]==NULL) 6}ftBmv  
     continue; zka?cOmYF[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RyuEHpN}  
    { eQ<xp A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <7^Kt7k  
     bProcessed=TRUE; @0|nq9l1  
    } yX'IZk#_L  
   } E5gl^Q?Z  
  } kon5+g9q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 V9T 4 +  
   for(int index=0;index<MAX_KEY;index++){ FZp<|t  
    if(hCallWnd[index]==NULL) >ZeEX, N  
     continue; 4{Udz!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) < eQ[kM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A*F9\mj I5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Hd 0Xx}3&  
   } Fc'[+L--Q  
  } (B:uc_+  
 }  2:'lZQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6R2uWv  
} PBrnzkoY  
sKd)BA0`  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: E0YU[([G  
<Oa9oM},d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o,FUfO}F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y9!:^kDI  
6m+W#]^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &$#99\ /  
5 `=KyHi:b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :B.G)M\  
{ =/9<(Tt%m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]fE3s{y &-  
 { F;kvH  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ao$):,2*  
  SaveBmp(); tOH0IE c  
  return FALSE; <d"Gg/@a  
 } %S`ik!K"I  
 …… //其它处理及默认处理 } 0;Sk(B>  
} v=p0 +J>  
0T))>.iu#  
jdM=SBy7q  
  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。 jNc<~{/  
2-mQt_ 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。 tD-gc ''H  
|I^y0Q:K  
  二、编程步骤 9m8ee&,  
%F J#uQXZ  
  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"; Pp*}R2  
k1fRj_@WPT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; h8 =h >W-  
UX_I6_&  
  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; x=,8[W#XT  
2 B` 8eb  
  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; C[YnrI!  
}bMWTT  
  5、 添加代码,编译运行程序。 LgHJo-+>  
F=}Z51|:~  
三、程序代码 _tj&Psp  
[ H,u)8)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (WE,dY+.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) frqJN  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lIh[|]  
#if _MSC_VER > 1000 &N\[V-GP2G  
#pragma once ``9 GY  
#endif // _MSC_VER > 1000 ~lw<799F6  
#ifndef __AFXWIN_H__ *48IF33&s  
#error include 'stdafx.h' before including this file for PCH J#7y< s  
#endif 16$y`~c-z  
#include "resource.h" // main symbols te'*<HM  
class CHookApp : public CWinApp A*'V+(  
{  (M`|'o!  
 public: XP;x@I#l  
  CHookApp(); XnXb&@Y  
  // Overrides sKfXg`0  
  // ClassWizard generated virtual function overrides s;{K!L@  
  //{{AFX_VIRTUAL(CHookApp) & iSD/W  
 public: Hr }k5'  
  virtual BOOL InitInstance(); FFe) e>bH  
  virtual int ExitInstance(); =Od>;|]m  
  //}}AFX_VIRTUAL Fe$/t(  
  //{{AFX_MSG(CHookApp) iV hJH4  
  // NOTE - the ClassWizard will add and remove member functions here. %^.P~s6  
  // DO NOT EDIT what you see in these blocks of generated code ! HXks_ix )  
  //}}AFX_MSG 2c:f<>r0y  
  DECLARE_MESSAGE_MAP() 5I,$EGG  
}; 8#f$rs(}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |F!F{d^p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d^84jf.U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8QF`,oXQO  
BOOL InitHotkey(); 2p:r`THvS5  
BOOL UnInit(); +t]Xj1Q  
#endif !T'X 'Q  
 @Fx@5e  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. z\.1>/Z=  
#include "stdafx.h" 2u:4$x8  
#include "hook.h" }<[Db}?9  
#include <windowsx.h> xb$yu.c  
#ifdef _DEBUG 40K2uT{cq  
#define new DEBUG_NEW 77Q}=80GU;  
#undef THIS_FILE (0jr;jv  
static char THIS_FILE[] = __FILE__; #":a6%0Q  
#endif JJf<*j^G  
#define MAX_KEY 100 L11L23:  
#define CTRLBIT 0x04 N z~" vi(t  
#define ALTBIT 0x02 AcC8)xRpk4  
#define SHIFTBIT 0x01 4}yE+dRUK:  
#pragma data_seg("shareddata") G) 7)]yBL  
HHOOK hHook =NULL; 9 5 H?{  
UINT nHookCount =0; ,Y!zORv<7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (pYYkR"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H(qm>h$bU  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :vQM>9l7  
static int KeyCount =0; 0Nr\2|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kuS/S\Z5K  
#pragma data_seg() 3Gd0E;3sk~  
HINSTANCE hins; I@./${o  
void VerifyWindow(); >XE`h 9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,w`~K:b.  
//{{AFX_MSG_MAP(CHookApp) yJD >ny  
// NOTE - the ClassWizard will add and remove mapping macros here. y1,5$0@G  
// DO NOT EDIT what you see in these blocks of generated code! U e*$&VlT  
//}}AFX_MSG_MAP {ZqQ!!b  
END_MESSAGE_MAP() ^:DyT@hQB5  
K{L.ZH>7  
CHookApp::CHookApp() Z?1OdoT-  
{ "# S>I8d  
 // TODO: add construction code here, e@jfIF0=}  
 // Place all significant initialization in InitInstance Y @}FL;3  
} D4Sh9:\  
uva\0q  
CHookApp theApp; =`p&h}h-L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gq4 . d  
{ xo~g78jm7,  
 BOOL bProcessed=FALSE; UqtHxEI%R~  
 if(HC_ACTION==nCode) /`+7_=-  
 { *K)0UKBr  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4e9E' "8%  
   switch(wParam) b UvK  
   { l)8sw=  
    case VK_MENU: 7/>a:02  
     MaskBits&=~ALTBIT; A&N*F"q  
     break; n,nisS  
    case VK_CONTROL: }O*WV1  
     MaskBits&=~CTRLBIT; V/bH^@,sA  
     break; ~`Sle xK|}  
    case VK_SHIFT: [ud|dwP"  
     MaskBits&=~SHIFTBIT; .,mPdVof  
     break; (hf zM+2  
    default: //judge the key and send message AMT slo  
     break; h5-d;RKE  
   } \cZfg%PN  
   for(int index=0;index<MAX_KEY;index++){ 8p =>?wG  
    if(hCallWnd[index]==NULL) treXOC9^B8  
     continue; cyMs(21  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2 sSwDF  
    { oh\1>3,Ns  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bp3L>AcVu  
     bProcessed=TRUE; SDc" 4g`  
    } &=zU611,  
   } sXB+s  
  } V2Y$yV8g1  
  else if((lParam&0xc000ffff)==1){ //Key down mo9$NGM&}  
   switch(wParam) ;0j*>fb\q7  
   { k/#>S*Ne  
    case VK_MENU: u(hC^T1  
     MaskBits|=ALTBIT; 263*: Y  
     break; btQet.  
    case VK_CONTROL: N!m%~kS9k<  
     MaskBits|=CTRLBIT; {!=2<-Aq  
     break; ;3 UvkN  
    case VK_SHIFT: 3;y_mg  
     MaskBits|=SHIFTBIT; E@pFTvo  
     break; F= i!d,S  
    default: //judge the key and send message NI\H \#bJ  
     break; h{/ve`F>@  
   } x,1=D~L}  
   for(int index=0;index<MAX_KEY;index++) A&l7d0Z^j5  
   { P<L&c_u  
    if(hCallWnd[index]==NULL) k7Oy5$##  
     continue; J px'W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f)^t')  
    { "Ot{^ _e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); MPvWCPB  
     bProcessed=TRUE; qGa<@ b  
    } KjYDFrR4  
   } ,?y7 ,nb  
  } HRHrSf7  
  if(!bProcessed){ D rTM$)  
   for(int index=0;index<MAX_KEY;index++){ c[{UI  
    if(hCallWnd[index]==NULL) a: IwA9!L  
     continue; ,n5a])Dg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h,]+>`b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xjrlc9  
   } A& =pw#  
  } stXda@y<p  
 } o<J5!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W5I=X] &  
} \`gEu{  
iGa}3pF  
BOOL InitHotkey() s3< F  
{ .. UoyBV  
 if(hHook!=NULL){ <[9?Rj@  
  nHookCount++; (nz}J)T&  
  return TRUE; :c<*%*e  
 } SG`)PW?  
 else #eLN1q&Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O PiaG!3<  
  if(hHook!=NULL) M.[wKGX(  
   nHookCount++; K;C_Z/<%  
  return (hHook!=NULL); w, 7Cr  
} z1Q2*:)c  
BOOL UnInit() p1^0{ILx  
{ lh$CWsx  
 if(nHookCount>1){ @+t (xCv  
  nHookCount--; i;]CL[#2e`  
  return TRUE; {Zwf..,  
 } 8KKz5\kn7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); k_O-5{  
 if(unhooked==TRUE){ 1p=&WM  
  nHookCount=0; fz8h]PZ  
  hHook=NULL; Hf_'32e3<  
 } 0etwz3NuW  
 return unhooked; nNs .,J)  
} [` 9^QEj  
*;X-\6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `sxN!Jj?  
{ p z @km  
 BOOL bAdded=FALSE; 1M/$< kQ-N  
 for(int index=0;index<MAX_KEY;index++){ tQ[]Rc  
  if(hCallWnd[index]==0){ X~zRZ0  
   hCallWnd[index]=hWnd; x~Cz?ljbn  
   HotKey[index]=cKey; Um'Ro4  
   HotKeyMask[index]=cMask; ?\M)WDO  
   bAdded=TRUE; mR,O0O}&  
   KeyCount++; ]|y}\7Aa  
   break; k- vA#  
  } a7 =YG6[  
 } Ge1duRGa  
 return bAdded; GoL|iNW`  
} YM8rJ-  
D&f!( n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CPGL!:  
{  feN!_ -  
 BOOL bRemoved=FALSE; `x*/UCy\  
 for(int index=0;index<MAX_KEY;index++){ [%? hCc  
  if(hCallWnd[index]==hWnd){ ETg{yBsp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _[%n ~6  
    hCallWnd[index]=NULL; ?cJA^W  
    HotKey[index]=0; l{QC}{Ejc2  
    HotKeyMask[index]=0; wB1-|= K1  
    bRemoved=TRUE; q N[\J7Pz9  
    KeyCount--; -N-4l  
    break; .yFg$|yG  
   } `a/PIc"  
  } &2<&X( )  
 } !~w6"%2+7  
 return bRemoved; :?&WKW  
} IgHs&=  
61s2bt#  
void VerifyWindow() R&x7Iq:=D  
{ ]P}K3tN%]  
 for(int i=0;i<MAX_KEY;i++){ &bS"N)je  
  if(hCallWnd!=NULL){ !S > |Qh  
   if(!IsWindow(hCallWnd)){ ziB]S@U  
    hCallWnd=NULL; N18diP[C  
    HotKey=0; *$4A|EA V  
    HotKeyMask=0; k_En_\c?p2  
    KeyCount--; P"~qio-  
   } 5 vu_D^Q  
  } E |GK3/  
 } ^ T:qT*v  
} TYJnQ2m  
C9z~)aL}7  
BOOL CHookApp::InitInstance() P98X[0&  
{ HhY2`P8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?V\9,BTb)  
 hins=AfxGetInstanceHandle(); KHc/x8^9  
 InitHotkey(); v,!Y=8~9  
 return CWinApp::InitInstance(); s:m<(8WRw  
} die2<'\4%  
 K+`-[v5\  
int CHookApp::ExitInstance() !rsqr32]  
{ hklO:,`  
 VerifyWindow(); nX.sh  
 UnInit(); _1>(GK5[  
 return CWinApp::ExitInstance(); >m_ p\$_  
} n[MIa]dK  
o,''f_tRQ|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $jm>tW&;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W_f"Gk  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "6*Kgf2G  
#if _MSC_VER > 1000 {KpH|i  
#pragma once utm+\/  
#endif // _MSC_VER > 1000 'j,Li(@}  
OCOO02Wq1  
class CCaptureDlg : public CDialog mb*h73{{  
{ n%MYX'0  
 // Construction }96/: ;:k  
 public: hO<w]jV,  
  BOOL bTray; ixJ20A7  
  BOOL bRegistered;  /nD0hb  
  BOOL RegisterHotkey(); M5ySs\O4  
  UCHAR cKey; {GH`V}Ob  
  UCHAR cMask; 7L~ zI>2  
  void DeleteIcon(); FOUs= E[  
  void AddIcon(); <*(UvOQuX  
  UINT nCount; $v bAcWj  
  void SaveBmp(); BqEubP(si  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <cfH '~  
  // Dialog Data @<w9fzi  
  //{{AFX_DATA(CCaptureDlg) vA7jZw  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z564K7IV  
  CComboBox m_Key; \,cKt_{ u  
  BOOL m_bControl; Q3'B$,3O^  
  BOOL m_bAlt; 1~xn[acy  
  BOOL m_bShift; #u2&8-Gh  
  CString m_Path; .jGsO0  
  CString m_Number; WJh;p: q[  
  //}}AFX_DATA Ag-?6v  
  // ClassWizard generated virtual function overrides cmGj0YUQ1  
  //{{AFX_VIRTUAL(CCaptureDlg) fF-\TW  
 public: #+ lq7HJ1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Sc"4%L  
 protected: vL=--#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ";Ig%]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FnQ_=b  
  //}}AFX_VIRTUAL 6_ &6'Vq  
  // Implementation ^q N1~v=hS  
 protected: []N$;~R7  
  HICON m_hIcon; /HJ(Wt q  
  // Generated message map functions n.qxxzEN  
  //{{AFX_MSG(CCaptureDlg) Z"%O&O  
  virtual BOOL OnInitDialog(); (h>X:!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sr($Bw  
  afx_msg void OnPaint(); \`%Y-!H+v  
  afx_msg HCURSOR OnQueryDragIcon(); 5bznM[%xO  
  virtual void OnCancel(); d @kLLDP  
  afx_msg void OnAbout(); LX?r=_\  
  afx_msg void OnBrowse(); 0*:hm%g  
  afx_msg void OnChange(); ; # ?0#):-  
 //}}AFX_MSG $I6eHjYT  
 DECLARE_MESSAGE_MAP() O\8|niW|  
}; 5iI3u 7Mn1  
#endif AoOG[to7  
't%%hw-m}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -S3+ h$Y8  
#include "stdafx.h" >8fz ?A  
#include "Capture.h" L9YwOSb.  
#include "CaptureDlg.h" e}4^N1'd/  
#include <windowsx.h> .5CELtR  
#pragma comment(lib,"hook.lib") #M9D" <pn}  
#ifdef _DEBUG ?kFCYZK|"  
#define new DEBUG_NEW +=H>s;B  
#undef THIS_FILE tD0>(41K  
static char THIS_FILE[] = __FILE__; ^FMa8;'o  
#endif .rB;zA;4S)  
#define IDM_SHELL WM_USER+1 n ua8y(W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <VxpMF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MJ/%$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >/`c mNmb  
class CAboutDlg : public CDialog bq&S?! =s  
{ N[bf.5T  
 public: ?*mbce[  
  CAboutDlg();  t-x"(  
  // Dialog Data Oi[9b  
  //{{AFX_DATA(CAboutDlg) irw 7  
  enum { IDD = IDD_ABOUTBOX }; 2GKU9cV*`  
  //}}AFX_DATA -hR\Y 2?  
  // ClassWizard generated virtual function overrides ;I))gY-n  
  //{{AFX_VIRTUAL(CAboutDlg) pBnf^Ew1  
 protected: {2clOUi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _,0!ZP-  
  //}}AFX_VIRTUAL wfTv<WG,.E  
  // Implementation Nu2]~W&  
 protected: #!&R7/ KdD  
  //{{AFX_MSG(CAboutDlg) )"Br,uIv:/  
  //}}AFX_MSG ?_j6})2zY  
  DECLARE_MESSAGE_MAP() p}zk&`  
}; xPJJ !mY  
7>@/*S{X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t\bxd`,  
{ }=m?gF%3  
 //{{AFX_DATA_INIT(CAboutDlg) jMWwu+w  
 //}}AFX_DATA_INIT +U)|&1oa  
} KdMA58)  
2xdJ(\JWM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -qP[$Q  
{ 7Z~szD  
 CDialog::DoDataExchange(pDX); :h^UC~[h 3  
 //{{AFX_DATA_MAP(CAboutDlg) Ci9wF (<k  
 //}}AFX_DATA_MAP S,9WMti4x  
} `&[:!U2]F  
YJvT p~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *]{I\rX  
 //{{AFX_MSG_MAP(CAboutDlg) j~f 7WJ  
 // No message handlers SWO!E  
 //}}AFX_MSG_MAP :XZom+>2n  
END_MESSAGE_MAP() `/ReJj&~  
{ZEXlNPww  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YIUmCx0a  
: CDialog(CCaptureDlg::IDD, pParent) m9w ; a  
{ ',s7h"  
 //{{AFX_DATA_INIT(CCaptureDlg) vk+%#w  
  m_bControl = FALSE; '"\Mjz)/  
  m_bAlt = FALSE; OSi9J.]O  
  m_bShift = FALSE; 5f@YrTO[@  
  m_Path = _T("c:\\"); \0T*msYQ  
  m_Number = _T("0 picture captured."); pz}hh^]t  
  nCount=0; :BxYaAVt^  
  bRegistered=FALSE; ayz1i:Q|  
  bTray=FALSE; U9sub6w6  
 //}}AFX_DATA_INIT 5nqdY*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kGiw?~t=%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pcTXTy 28  
} K5rj!*x.o  
pdqa)>$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  VgoKi  
{ [y;ZbfMP|o  
 CDialog::DoDataExchange(pDX); Dx*oSP.qX  
 //{{AFX_DATA_MAP(CCaptureDlg) %)ov,p |  
  DDX_Control(pDX, IDC_KEY, m_Key); jV&W[xKa  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (`/i1#nR  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {j*+:Gj0V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8^i,M^f^{  
  DDX_Text(pDX, IDC_PATH, m_Path); =H?5fT^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); g~u!,Zc  
 //}}AFX_DATA_MAP 3PeJPw  
} W\Y 4%y}  
vAxtN RS  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vu >@_hv  
//{{AFX_MSG_MAP(CCaptureDlg) w*@Z-'(j  
 ON_WM_SYSCOMMAND() o|E(_ Y4d  
 ON_WM_PAINT() ,1h(k<-  
 ON_WM_QUERYDRAGICON() ')~HOCBSE  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sRI8znus  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WLFzLW=PD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 'Q,<_ L"  
//}}AFX_MSG_MAP `o'sp9_3  
END_MESSAGE_MAP() [/]3:|  
ueo3i1  
BOOL CCaptureDlg::OnInitDialog() 9j9?;3;  
{ 40/[ uW"  
 CDialog::OnInitDialog(); !\v3bOi&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lph_cY3p  
 ASSERT(IDM_ABOUTBOX < 0xF000); r${a S@F  
 CMenu* pSysMenu = GetSystemMenu(FALSE); wt,N<L  
 if (pSysMenu != NULL) m!if_Iq  
 { e#{L ~3  
  CString strAboutMenu; Fd'L:A~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); W0hLh<Go  
  if (!strAboutMenu.IsEmpty()) <3OV  
  { oaE3Aa  
   pSysMenu->AppendMenu(MF_SEPARATOR); GrIdQi^8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); V4D&&0&n  
  } ktb. fhO  
 } #k, kpL<a  
 SetIcon(m_hIcon, TRUE); // Set big icon ><^@1z.J  
 SetIcon(m_hIcon, FALSE); // Set small icon euK!JZ  
 m_Key.SetCurSel(0); af{K4:I  
 RegisterHotkey(); SNFz#*  
 CMenu* pMenu=GetSystemMenu(FALSE); Atw^C+"vW&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); D1 z3E;:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6!N&,I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); g?wogCs5  
 return TRUE; // return TRUE unless you set the focus to a control rKxk?}  
} u:|5jF  
%yVZ|d*Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zwS'AN'A  
{ u@Lu.t!],  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >LSA?dy!?  
 { ^,gKA\Wli  
  CAboutDlg dlgAbout; d=XhOC$  
  dlgAbout.DoModal(); 4g9VE;Gd  
 } To+{9"$,  
 else Ws(>} qjy  
 { ?a}~yz#B(  
  CDialog::OnSysCommand(nID, lParam); w,7 GC5j\  
 } ~qF9*{~!  
} zc"eSy< w$  
8VnZ@*  
void CCaptureDlg::OnPaint() ZO~N|s6B^  
{ h) rHf3:  
 if (IsIconic()) FP$]D~DMo  
 { 8b/yT4f  
  CPaintDC dc(this); // device context for painting Y!H"LI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q0}LfXql8  
  // Center icon in client rectangle wJ}8y4O!N  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4 _ 3\4  
  int cyIcon = GetSystemMetrics(SM_CYICON); L2N/DB'{  
  CRect rect; Hd:ZE::Q'#  
  GetClientRect(&rect); 4%p vw;r  
  int x = (rect.Width() - cxIcon + 1) / 2; '*pq@|q;t  
  int y = (rect.Height() - cyIcon + 1) / 2; vgV0a{u"  
  // Draw the icon $]9d((u4  
  dc.DrawIcon(x, y, m_hIcon); v1: 5 r  
 } Y#G '[N>  
 else h OV+}P6  
 { ' ySWf,Q^  
  CDialog::OnPaint(); /{lls2ycW%  
 } =3@^TW(j  
} i9\Pks#l%  
Uc&0>_Z  
HCURSOR CCaptureDlg::OnQueryDragIcon() jE{z4en  
{ ve$P=ZuM  
 return (HCURSOR) m_hIcon; 5<u+2x8|  
} 4CDmq[AVS[  
>0>M@s  
void CCaptureDlg::OnCancel() 7BC9cS(0w9  
{ 6D$xG"c  
 if(bTray) 4m~\S)ad  
  DeleteIcon(); ,[A} 86  
  CDialog::OnCancel(); L Nj|t)Ov  
} ]xuq2MU,l  
)%Y$F LB  
void CCaptureDlg::OnAbout() .AKx8=f  
{ L-fAT'!'  
 CAboutDlg dlg; ioZ2J"s  
 dlg.DoModal(); ?&?y-&.5-  
} |/q*Fg[f  
a+MC[aFr  
void CCaptureDlg::OnBrowse() :r|dXW  
{  p.zU9rID  
 CString str; t]Vw` z%G  
 BROWSEINFO bi; fz:F*zT1  
 char name[MAX_PATH]; nwz}&nR  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Bs^W0K$uBO  
 bi.hwndOwner=GetSafeHwnd(); %F03cI,  
 bi.pszDisplayName=name;  ;v.l<AOE  
 bi.lpszTitle="Select folder"; L-Z1Xs  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~=}56yxl[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  Wkf)4!  
 if(idl==NULL) Qg3 -%i/@  
  return; J)*y1   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bvAO(`  
 str.ReleaseBuffer(); #B54p@.}  
 m_Path=str; puDy&T  
 if(str.GetAt(str.GetLength()-1)!='\\') D`Fl*Wc4H  
  m_Path+="\\"; j'~xe3j  
 UpdateData(FALSE); P[^!Uq[0n7  
} V<+d o|@F  
U%2pbGU  
void CCaptureDlg::SaveBmp() ?eeE[F  
{ D_'Zucq  
 CDC dc; eml(F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *S*;rLH9c  
 CBitmap bm; h}.0Ne  
 int Width=GetSystemMetrics(SM_CXSCREEN); .{~ygHQ`f  
 int Height=GetSystemMetrics(SM_CYSCREEN); AuSL?kZ4|Y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :*Sl\:_X)  
 CDC tdc; RKRk,jRL  
 tdc.CreateCompatibleDC(&dc); ZCV&v47\p_  
 CBitmap*pOld=tdc.SelectObject(&bm); 'Ko T8g\b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P 3);R>j  
 tdc.SelectObject(pOld); Xq,{)G%9nM  
 BITMAP btm; -S Z^;t  
 bm.GetBitmap(&btm); 4,UvTw*2z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `nn;E% n  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ga0W;Vq&X  
 BITMAPINFOHEADER bih; s:,BcVLx^  
 bih.biBitCount=btm.bmBitsPixel; HtPasFrJ  
 bih.biClrImportant=0; ]#KZ W)M  
 bih.biClrUsed=0; 7hY~  
 bih.biCompression=0; PudwcP {  
 bih.biHeight=btm.bmHeight; 6E85mfFS  
 bih.biPlanes=1; HS>Z6|uLY  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^0c:ro  
 bih.biSizeImage=size; d 6j'[  
 bih.biWidth=btm.bmWidth; _.yBX\tf[  
 bih.biXPelsPerMeter=0; Sycs u_je  
 bih.biYPelsPerMeter=0; `pOiv&>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [C.Pzo  
 static int filecount=0; _/]4:("  
 CString name; 1s"6  
 name.Format("pict%04d.bmp",filecount++); rq:R6e  
 name=m_Path+name; "~> # ;x{  
 BITMAPFILEHEADER bfh; 9YwK1[G6/  
 bfh.bfReserved1=bfh.bfReserved2=0; uF/l,[0v  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ? L|m:A`  
 bfh.bfSize=54+size; gk1I1)p  
 bfh.bfOffBits=54; +W x/zo  
 CFile bf; ^~E?7{BL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 87.b7 b.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); QVA)&k'T,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qSj$0Hq5XI  
  bf.WriteHuge(lpData,size); ZUE?19GA  
  bf.Close(); 8GC(?#Kb  
  nCount++; |cZKj|0>  
 } WHh=ht s\  
 GlobalFreePtr(lpData); _Se~bkw?v  
 if(nCount==1) TM sEHd  
  m_Number.Format("%d picture captured.",nCount); $O|J8;"v  
 else ?<@yo&)  
  m_Number.Format("%d pictures captured.",nCount); 5~WMb6/  
  UpdateData(FALSE); [;5?=X,LD  
} z;x1p)(xt  
!M]_CPh]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3\Y}{(O |  
{ ;dq AmBG{8  
 if(pMsg -> message == WM_KEYDOWN) K>H_q@-?f  
 { Oh9jr"Gm=  
  if(pMsg -> wParam == VK_ESCAPE) enu",wC3  
   return TRUE; 7X|M\WUq  
  if(pMsg -> wParam == VK_RETURN) Q+4xU  
   return TRUE; =\IcUY,4  
 } MYqxkhcLH1  
 return CDialog::PreTranslateMessage(pMsg); $~,]F  
} (0%0+vY  
#N-NI+qX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0-dhGh?.  
{ d7o~$4h|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ F8 4LMk?U  
  SaveBmp(); wzAp`Zs2Dm  
  return FALSE; ?3tR(H<  
} >c~~i-=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7Kx3G{5ja  
 CMenu pop; }-{l(8-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6ju+#]T  
 CMenu*pMenu=pop.GetSubMenu(0); -0| '{  
 pMenu->SetDefaultItem(ID_EXITICON); 7M: 0%n$  
 CPoint pt; L4SvE^2+  
 GetCursorPos(&pt); !F{5"$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5Am*1S^  
 if(id==ID_EXITICON) g5TXs^g  
  DeleteIcon(); zqAK|jbL  
 else if(id==ID_EXIT) uC G^,BQ  
  OnCancel(); 9s)YPlDz  
 return FALSE; [_j.pMH/P  
} IsO'aFK)ln  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M3 8,SH<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )|/t}|DIx  
 AddIcon(); <R~(6krJwZ  
 return res; Jg|3Wjq5  
} S5RS?ya  
^sH1YE}0  
void CCaptureDlg::AddIcon() &eY$(o-Hw  
{ {U=za1Ga  
 NOTIFYICONDATA data; j^Zp BNL  
 data.cbSize=sizeof(NOTIFYICONDATA); yB}y'5  
 CString tip; R4}G@&Q  
 tip.LoadString(IDS_ICONTIP); =fBJQK2sk  
 data.hIcon=GetIcon(0); s4SR6hBO  
 data.hWnd=GetSafeHwnd(); ZvNXfC3Ia  
 strcpy(data.szTip,tip); =]7|*-  
 data.uCallbackMessage=IDM_SHELL; Fg4eIE-/M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wr*A%:  
 data.uID=98; /H^bDUC :r  
 Shell_NotifyIcon(NIM_ADD,&data); wSIt"g,%  
 ShowWindow(SW_HIDE); 4$.UVW\  
 bTray=TRUE; ) !ZA.sx  
} R|!4Y`  
hFa\x5I5  
void CCaptureDlg::DeleteIcon() @]*z!>1  
{ /]]\jj#^  
 NOTIFYICONDATA data; 1; L!g*!E  
 data.cbSize=sizeof(NOTIFYICONDATA); #=t:xEz  
 data.hWnd=GetSafeHwnd(); iG!MIt*  
 data.uID=98; $yaE!.Kc  
 Shell_NotifyIcon(NIM_DELETE,&data); @c$mc  
 ShowWindow(SW_SHOW); e5fJN)+a  
 SetForegroundWindow(); !l6B_[!@  
 ShowWindow(SW_SHOWNORMAL); >E"FoZM=  
 bTray=FALSE; L6$,<}l  
} 1Sz5&jz  
>!? f6 {\|  
void CCaptureDlg::OnChange() P9`i6H'~  
{ ~`tc|Zu  
 RegisterHotkey(); k1-?2kf"{  
} RWA|%/L  
{LJCY<IGq  
BOOL CCaptureDlg::RegisterHotkey() oF V9t{~j  
{ [W{`L_"  
 UpdateData(); x+yt| &B  
 UCHAR mask=0; )Y?H f2']  
 UCHAR key=0; Xg!Mc<wA[  
 if(m_bControl) >YoK?e6  
  mask|=4; u# =N8  
 if(m_bAlt) a3Es7R+S  
  mask|=2; HdWghxz?)  
 if(m_bShift) P'ZWAxd  
  mask|=1; :Fj4YP"  
  key=Key_Table[m_Key.GetCurSel()]; 'zT/ x`V  
 if(bRegistered){ GUat~[lUrj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |Z 3POD"9  
  bRegistered=FALSE; 8agd{bxU  
 } S2jo@bp!  
 cMask=mask; NX)7g}S  
 cKey=key; gWgK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qLYv=h$,  
 return bRegistered; BzWmV .5  
} `q_7rrkO  
RSmxwx^  
  四、小结 MiOSSl};  
zi*D8!_C  
  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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