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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: v~T)g"_|  
  D6&P9e_5  
  一、实现方法 ]BjY UTNm  
Dr V[1Z  
  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: S#B%[3@  
x$n.\`f0  
#pragma data_seg("shareddata") izaqEz  
HHOOK hHook =NULL; //钩子句柄 -s`Wd4AP  
UINT nHookCount =0; //挂接的程序数目 a3\~AO H%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,IqE<i!U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !&g_hmnIF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3Wbd=^hRvq  
static int KeyCount =0; V4ePYud;^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n_RZ:<Gr  
#pragma data_seg() t=@d`s:R2  
kc P ZIP:  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 W)/f5[L  
8~R.iqLoX  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: e@0|fB%2  
knG:6tQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O TlqJ  
cKey,UCHAR cMask) oST)E5X;7  
{ eLORG(;h4  
 BOOL bAdded=FALSE; 7=}tJ  
 for(int index=0;index<MAX_KEY;index++){ xZ;eV76  
  if(hCallWnd[index]==0){ <Z3C&BM  
   hCallWnd[index]=hWnd; DzE^FY  
   HotKey[index]=cKey; /}>8|#U3y  
   HotKeyMask[index]=cMask; wzd(= *N  
   bAdded=TRUE; D})/2O p   
   KeyCount++; #-G@p  
   break; Ot`%5<E^  
  } fx(8 o+  
 } #<9'{i3  
 return bAdded; % R25,  V  
} d$bO.t5CLh  
//删除热键 P![ZO6`:W'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,e;,+w=~E  
{ Tc||96%2^  
 BOOL bRemoved=FALSE; vnQFq  
 for(int index=0;index<MAX_KEY;index++){ f~a 7E;y  
  if(hCallWnd[index]==hWnd){ e.DN,rhqI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #I0FWZ>W  
    hCallWnd[index]=NULL; 3?"gfw W  
    HotKey[index]=0; NcF>}f,}\  
    HotKeyMask[index]=0; $3>Rw/,  
    bRemoved=TRUE; %po;ih$jr*  
    KeyCount--; ^ [HUtq  
    break; OF']-  
   } wUr(i*  
  } hDW_a y4  
 } $#s5y~z  
 return bRemoved; sGtxqnX:J  
} ?;`GCE  
JcmMbd&B  
v@[3R7|4  
  DLL中的钩子函数如下: \9V_[xD+  
m]MR\E5]By  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5Wa)_@qI)`  
{  XA;PWl5!  
 BOOL bProcessed=FALSE; R--s u:  
 if(HC_ACTION==nCode) 2 SD Z  
 { &R4?]I  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Tb?XKO,  
   switch(wParam) _$@fCo0  
   {  KNQj U-A  
    case VK_MENU: Y_ne?/sZE  
     MaskBits&=~ALTBIT; t!/~_}eDJ  
     break; exiu;\+j  
    case VK_CONTROL: SUMfebW5  
     MaskBits&=~CTRLBIT; {[Ri:^nHgL  
     break; T?!SEblP]  
    case VK_SHIFT: l6w\E=K  
     MaskBits&=~SHIFTBIT; >\pF5a`  
     break; %u&Vt"6m=  
    default: //judge the key and send message tyW[i8)O}  
     break; h'h8Mm  
   } H#hpaP;  
   for(int index=0;index<MAX_KEY;index++){ Hkia&nz'3  
    if(hCallWnd[index]==NULL) UF5_be,D  
     continue; 5p!{#r6m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NwYQ6VEA  
    { DeF`#a0E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Mpw]dYM  
     bProcessed=TRUE; rqN+0CT  
    } ,#, K_oz  
   } 5cQ]vb  
  } jmv=rl>E*  
  else if((lParam&0xc000ffff)==1){ //有键按下 J0R{|]W8  
   switch(wParam) 8w[O%  
   { >@bU8}rT  
    case VK_MENU: +<xQF  
     MaskBits|=ALTBIT; @"fv[=Xb  
     break; !=.y[Db=  
    case VK_CONTROL: eza"<uBr  
     MaskBits|=CTRLBIT; YzZj=]\`b  
     break; -th.(eAx  
    case VK_SHIFT: CckfoJ 9  
     MaskBits|=SHIFTBIT; Sft vN-  
     break; 'G % ]/'_U  
    default: //judge the key and send message VM<0_R24z  
     break; CT|0KB&  
   } UQh.o   
   for(int index=0;index<MAX_KEY;index++){ 8h|}Q_  
    if(hCallWnd[index]==NULL) (&Q!5{$W  
     continue; y,&[OrCm^\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &4WA/'>R  
    { vD9.X}l]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'J &R=MD  
     bProcessed=TRUE; fI0"#i v}  
    } |?0MRX0'g  
   } p.(+L^-=  
  } 0H +nVR  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ojBdUG\  
   for(int index=0;index<MAX_KEY;index++){ i.On{nB"k  
    if(hCallWnd[index]==NULL) 2&:z[d}~H  
     continue; Z*q&^/N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @]~.-(IMh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;rL1[qwk  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^u$=<66  
   } Z P|k3   
  } ]Ri=*KZa  
 } BRu}"29  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H'!OEZ  
} '*Dp2Y{7  
p{GO-gE@  
  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: _UkBOJ:G$H  
[>p!*%m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ( EJ1g^|"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;5\'PrE  
0~$9z+S  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: DcaKGjp  
|;Jt * _  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sxF2ku4A  
{ ~e[qh+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0$Mxu7 /  
 { Sb2_&5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,Q Ge=Exn  
  SaveBmp(); /[>_Ry,  
  return FALSE; R7z @y o  
 } N6_1iIM  
 …… //其它处理及默认处理 )eZuG S  
} -t<1A8%  
X{!,j}  
R'B_YKHBY  
  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。 `/R. 5;$|  
z$m(@Q  
  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。 w0$+v/  
zp f<!x^  
  二、编程步骤 Wy6a4oY  
4`oKvL9  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; gk8 v{'0Er  
7vPG b:y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \+U;$.)3  
#Cs/.(<  
  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;  Y~^R^J  
7],y(:[=v  
  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; P;gd!Yl<-  
{*hGe_^  
  5、 添加代码,编译运行程序。 pQ7elv]  
A-myY30  
三、程序代码 $d-yG553  
v?3xWXX,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL o\Fv~^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W4nn)qBrh  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,s}&|+ '"  
#if _MSC_VER > 1000 uInI{>  
#pragma once M{)eA<6  
#endif // _MSC_VER > 1000 A\7sP =  
#ifndef __AFXWIN_H__ #H~$^L   
#error include 'stdafx.h' before including this file for PCH QRl+7V  
#endif j8?! J^TC  
#include "resource.h" // main symbols K9ih(fh)  
class CHookApp : public CWinApp h 1 "#  
{ oIj/V|ByK  
 public: -3d`e2^&}  
  CHookApp(); Z{#3-O<a+n  
  // Overrides _RzoXn{1e  
  // ClassWizard generated virtual function overrides CUC]-]8  
  //{{AFX_VIRTUAL(CHookApp) #] Do_Z  
 public: jc>B^mqx  
  virtual BOOL InitInstance(); Jk|DWZ  
  virtual int ExitInstance(); o(v7&m;  
  //}}AFX_VIRTUAL d,meKQ n  
  //{{AFX_MSG(CHookApp) :D2GLq*\  
  // NOTE - the ClassWizard will add and remove member functions here. gV:0&g\v  
  // DO NOT EDIT what you see in these blocks of generated code ! x=W s)&H_Y  
  //}}AFX_MSG Ik5-ooZ&{  
  DECLARE_MESSAGE_MAP() a.O"I3{?h  
}; v=dN$B5y3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q:jv9eL.O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lQ [JA[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K'"s9b8  
BOOL InitHotkey(); Mjl,/-0 w  
BOOL UnInit(); dYwEVu6q  
#endif 9~K>c  
$j(4FyH\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. X9" T(`  
#include "stdafx.h" 'f %oL/,  
#include "hook.h" ^pfM/LQ@  
#include <windowsx.h> Pq-@waH3  
#ifdef _DEBUG oz3!%'  
#define new DEBUG_NEW l% %cU"  
#undef THIS_FILE jt3W.^6HO  
static char THIS_FILE[] = __FILE__; Bv*VNfUm  
#endif 67Tu8I/r  
#define MAX_KEY 100 #t# S(A9)  
#define CTRLBIT 0x04 l96 AJB'  
#define ALTBIT 0x02 qM^y@B2MO  
#define SHIFTBIT 0x01 Fo ,8"m  
#pragma data_seg("shareddata")  _ qQ  
HHOOK hHook =NULL; m^/>C -&C  
UINT nHookCount =0; Vj)"?|V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \0qFOjVj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT & }"I!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Tn3C0  
static int KeyCount =0; 3XbFg%8YG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #:MoZw`rlw  
#pragma data_seg() !HXsxNe  
HINSTANCE hins; bgInIe  
void VerifyWindow(); Ia^/^>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )J[Ady^5  
//{{AFX_MSG_MAP(CHookApp) .'-t>(}v  
// NOTE - the ClassWizard will add and remove mapping macros here. $x+ P)5)  
// DO NOT EDIT what you see in these blocks of generated code! &XhxkN$8  
//}}AFX_MSG_MAP 0q1+5  
END_MESSAGE_MAP() 0r&FH$  
q7rX4-G$  
CHookApp::CHookApp() ( Y mIui>  
{ vL"n oLs  
 // TODO: add construction code here, V*6&GM&  
 // Place all significant initialization in InitInstance 98{n6$\  
} t#]VR7]  
8L@@UUjr  
CHookApp theApp; [R~@#I P!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M&/e*Ta5  
{ k5)IBO  
 BOOL bProcessed=FALSE; 3VQmo\li  
 if(HC_ACTION==nCode) RC/& dB  
 { +fMW B  
  if((lParam&0xc0000000)==0xc0000000){// Key up Jx4~o{Z}c  
   switch(wParam) , d4i0;2}+  
   { !E *IktAI  
    case VK_MENU: r9-)+R J  
     MaskBits&=~ALTBIT; `E>o:tff  
     break; y dzvjp=  
    case VK_CONTROL: cf_X=;yaqy  
     MaskBits&=~CTRLBIT; .e S* F  
     break; )B5U0iIi  
    case VK_SHIFT: "MOmJYH  
     MaskBits&=~SHIFTBIT; K<u~[^R  
     break; N,cj[6;T%  
    default: //judge the key and send message Tl^)O^/  
     break; 4)N~*+~\h  
   } <S@2%%W  
   for(int index=0;index<MAX_KEY;index++){ ;/^O7KM-  
    if(hCallWnd[index]==NULL) j8t_-sU9 i  
     continue; !6s]p%{V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !<>`G0  
    { qMBEJ<o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @c,=c+-  
     bProcessed=TRUE; @oMl^UYM=  
    } /-3)^R2H  
   } .Ag)/Xm(?  
  }  $)(Zt^  
  else if((lParam&0xc000ffff)==1){ //Key down @Z~0!VY  
   switch(wParam) kr]_?B(r  
   { 3SOrM  
    case VK_MENU: x C>>K6Nb  
     MaskBits|=ALTBIT; 00A2[gO9  
     break; vmtmiN8;d  
    case VK_CONTROL: bgmOX&`G  
     MaskBits|=CTRLBIT; |Gb~[6u   
     break; w:9n/[  
    case VK_SHIFT: ^`(3X  
     MaskBits|=SHIFTBIT; X*:)]p(R  
     break; )|S!k\^A  
    default: //judge the key and send message ~eGtoEY  
     break; Jz_`dLL^ w  
   } qI\B;&hr(  
   for(int index=0;index<MAX_KEY;index++) V ;M'd@  
   { {Hxziyv~Y(  
    if(hCallWnd[index]==NULL) MCfDR#a  
     continue; M5LqZyY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 55x.Q  
    { k%cT38V*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FBI^}^#_  
     bProcessed=TRUE; a^9}ceu?   
    } &R}2/Mt  
   } /vFdhh  
  } ]<E\J+5K  
  if(!bProcessed){ k5GJrK+  
   for(int index=0;index<MAX_KEY;index++){ eN I6V/\`  
    if(hCallWnd[index]==NULL) g*:f#u5  
     continue; _&F*4t!n_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]P(_ d'}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sMb+4{W&6  
   } ]3yaIlpD1  
  } *s"{JrG`O  
 } 32):&X"AIh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); knu>{a}  
} ?|we.{  
+p)kemJ~  
BOOL InitHotkey() @X0$X+]E*8  
{ H52] Zm  
 if(hHook!=NULL){ 3sBu`R*hk  
  nHookCount++; s$OnQc2/  
  return TRUE; \Ot,&Z k2  
 } ?bK^IHh  
 else W6uz G  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;(9q, )  
  if(hHook!=NULL) kA<58 ,!  
   nHookCount++; Y- c_ 2 )  
  return (hHook!=NULL); C+c;UzbD  
} t[^68]  
BOOL UnInit() @{UtS2L  
{ 9.$k^|~  
 if(nHookCount>1){ XhJbBVS|  
  nHookCount--; 62%=%XD  
  return TRUE; #s^~'2^%4  
 } pD%Pg5p`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v`pIovn  
 if(unhooked==TRUE){ H!dg(d^  
  nHookCount=0; HrQft1~N  
  hHook=NULL; m]:|j[!*M  
 } th(<S  
 return unhooked; WMd5Y`y  
} >`c-Fqk  
Ucz`^}+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PWThm ooP  
{ iOzY8M+N(  
 BOOL bAdded=FALSE; L+y90 T6?  
 for(int index=0;index<MAX_KEY;index++){ C e1^S[  
  if(hCallWnd[index]==0){ yGtGhP8  
   hCallWnd[index]=hWnd; =;^#5dpt$  
   HotKey[index]=cKey; Zo|# ,AdE>  
   HotKeyMask[index]=cMask; 3]}wZY0  
   bAdded=TRUE; Kr|9??`0E  
   KeyCount++; Zb=H\#T  
   break; pElAY3  
  } OfGMeN6  
 } p+ bT{:  
 return bAdded; =h9&`iwiu  
} ns,qj} #  
=E''$b?Em  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %$L!N-U6  
{ d@-bt s&3  
 BOOL bRemoved=FALSE; xA>O4S D  
 for(int index=0;index<MAX_KEY;index++){ h*9s^`9)  
  if(hCallWnd[index]==hWnd){ A296 f(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VdV18-ea  
    hCallWnd[index]=NULL; !4B($]t  
    HotKey[index]=0; 6{p] cr  
    HotKeyMask[index]=0; c31k%/.  
    bRemoved=TRUE; m#a0HH  
    KeyCount--; z tLP {q#  
    break; 4=E9$.3a  
   } SiyZq"  
  } 'XHKhpm<  
 } UfnjhHu  
 return bRemoved; HqpwQ  
} BHh%3Q  
jNa'l<dn]  
void VerifyWindow() @] ` _+\y  
{ 9,`eYAu  
 for(int i=0;i<MAX_KEY;i++){ 'X$2gD3c9  
  if(hCallWnd!=NULL){ g~JN"ap  
   if(!IsWindow(hCallWnd)){ as?~N/}  
    hCallWnd=NULL; Z;bg;@r|  
    HotKey=0; 5g3D}F>OJ  
    HotKeyMask=0; 3;6Criq}  
    KeyCount--; 2#bpWk9  
   } gE>_:s   
  } 3"Y |RSy  
 } N>S_Vgk}  
} nDvj*lZF  
El$yM.M"  
BOOL CHookApp::InitInstance() #sK:q&/G`  
{ l |c#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); P<@V  
 hins=AfxGetInstanceHandle(); e-dpk^-  
 InitHotkey(); O%.c%)4Xo  
 return CWinApp::InitInstance(); "[ 091<  
} D/1f> sl  
? L A>5  
int CHookApp::ExitInstance() 2/K38t'-  
{ W9ZfD~(3-  
 VerifyWindow(); oyS43/."  
 UnInit(); G/:;Qig  
 return CWinApp::ExitInstance(); A[F tPk{k  
} VgHVj)ir  
Ne)H*DT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \/Z?QBFvz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +p:#$R)MW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $-zt,iRyV  
#if _MSC_VER > 1000 4#oLf1  
#pragma once ppjS|l*`  
#endif // _MSC_VER > 1000 4]F:QS% x  
#&A)%Qbg  
class CCaptureDlg : public CDialog %B&y^mZv*\  
{ U=4tJb  
 // Construction o+o'!)  
 public: A3VXh^y+  
  BOOL bTray; kDAPT_Gid  
  BOOL bRegistered; c5& _'&  
  BOOL RegisterHotkey(); u&HLdSHe  
  UCHAR cKey; 2`XG"[@  
  UCHAR cMask; s3sAw~++  
  void DeleteIcon(); u/5 ^N^@^  
  void AddIcon(); aB6F<"L,  
  UINT nCount; >8$]g  
  void SaveBmp(); e^?0uVxS1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor pDlU*&  
  // Dialog Data Ka|WT|1  
  //{{AFX_DATA(CCaptureDlg) ?=X G#we  
  enum { IDD = IDD_CAPTURE_DIALOG }; XN@F6Gj  
  CComboBox m_Key; biy1!r  
  BOOL m_bControl; $n30[P@p;  
  BOOL m_bAlt; 3_:J`xX(4  
  BOOL m_bShift; D\}A{I92F4  
  CString m_Path; TmZ% ;TN  
  CString m_Number; {_GhS%  
  //}}AFX_DATA UQmdm$.  
  // ClassWizard generated virtual function overrides Sl,\  <a  
  //{{AFX_VIRTUAL(CCaptureDlg) 7$8YBcZ6  
 public: " Zo<$p3]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); h/7m.p]  
 protected: ^h}xFiAV#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bG`aF*10)!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +}eGCZra  
  //}}AFX_VIRTUAL rq;Xcc  
  // Implementation &R? \q*  
 protected: oDtgB O<  
  HICON m_hIcon; !Nu ~4  
  // Generated message map functions Z%]s+V)st  
  //{{AFX_MSG(CCaptureDlg) \OV><|Lkh  
  virtual BOOL OnInitDialog(); K+=cNC4B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MlDWK_y_&  
  afx_msg void OnPaint(); hmfO\gc}y  
  afx_msg HCURSOR OnQueryDragIcon(); Rt &Oz!TQ  
  virtual void OnCancel(); n&? --9r  
  afx_msg void OnAbout(); z+RA  
  afx_msg void OnBrowse(); R4 8w\?L  
  afx_msg void OnChange(); \yIan<q  
 //}}AFX_MSG jF5Y-CX  
 DECLARE_MESSAGE_MAP() n]?KDID;  
}; A2fc_A/a  
#endif v{/z`J!JR  
sp=;i8Y 3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8.9Z0  
#include "stdafx.h" tVB9kxtE  
#include "Capture.h" f-lM[\ma_  
#include "CaptureDlg.h" IY Ilab\TZ  
#include <windowsx.h> 1{ TmK9U  
#pragma comment(lib,"hook.lib") f,Z* o  
#ifdef _DEBUG qhFWQ1W  
#define new DEBUG_NEW mBQA~@ }  
#undef THIS_FILE T$p!I RPt  
static char THIS_FILE[] = __FILE__; 7rF )fKW  
#endif m&o6j>C  
#define IDM_SHELL WM_USER+1 *] H8X=[x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N:"S/G>r ;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =UGyZV:z5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4<j)1i=A  
class CAboutDlg : public CDialog ZCP r`H  
{ :Pa^/i  
 public: M0+xl+c+  
  CAboutDlg(); 4f)B@A-  
  // Dialog Data P!c.!8C$  
  //{{AFX_DATA(CAboutDlg) ] LcCom:]  
  enum { IDD = IDD_ABOUTBOX }; 4=BIYC"Lu  
  //}}AFX_DATA q5@N//<DNN  
  // ClassWizard generated virtual function overrides gk &  
  //{{AFX_VIRTUAL(CAboutDlg) #qx$ p  
 protected: .uo9VL<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S.u1[Yz^  
  //}}AFX_VIRTUAL F$tshe(  
  // Implementation Ol%KXq[  
 protected: TBAF_$  
  //{{AFX_MSG(CAboutDlg) Aoi) 11>  
  //}}AFX_MSG &7K 4tL  
  DECLARE_MESSAGE_MAP() Yo 0wufbfV  
}; G1RUu-~+  
q9)]R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) e}xx4mYo  
{ 2.,4b-^  
 //{{AFX_DATA_INIT(CAboutDlg) 6cO3 6  
 //}}AFX_DATA_INIT 7?U)V03  
} pTQ70V3  
O,a1?_m8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -2o_ L?  
{ DG%vEM,y  
 CDialog::DoDataExchange(pDX); ?@*hU2MTC  
 //{{AFX_DATA_MAP(CAboutDlg) -a=RCzX]  
 //}}AFX_DATA_MAP YadG05PDe  
} 50< QF  
QPc4bg\J~t  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z CS.P.$  
 //{{AFX_MSG_MAP(CAboutDlg) e-Pn,j  
 // No message handlers <"GgqyRzv  
 //}}AFX_MSG_MAP WQJnWe   
END_MESSAGE_MAP() ?M<q95pL  
3PLYC}Jq  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4p}?QR>tZ  
: CDialog(CCaptureDlg::IDD, pParent) 0*=[1tdWY  
{ yi29+T7j4S  
 //{{AFX_DATA_INIT(CCaptureDlg) UrMEL; @g  
  m_bControl = FALSE; n+'gVEBA  
  m_bAlt = FALSE; IqA'Vz,lL  
  m_bShift = FALSE; b.N$eJlQ&  
  m_Path = _T("c:\\"); [}mx4i  
  m_Number = _T("0 picture captured."); f/?uo sS  
  nCount=0; 6Z}8"VJr {  
  bRegistered=FALSE; ,8tk]W[C  
  bTray=FALSE; ro %Jg  
 //}}AFX_DATA_INIT l;~b:[r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8q}955Nl  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4X}.aZO&b  
} rf ?\s/#OY  
wr) \GJ#>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) iImy"$yX{  
{ ;4%Co)Rw  
 CDialog::DoDataExchange(pDX); 3J3Yt`  
 //{{AFX_DATA_MAP(CCaptureDlg) ;4:[kv@  
  DDX_Control(pDX, IDC_KEY, m_Key); >bLhCgF:"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :{g;J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); iAl.(j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); * ^+]`S  
  DDX_Text(pDX, IDC_PATH, m_Path); j5Cf\*B4J  
  DDX_Text(pDX, IDC_NUMBER, m_Number); d,5,OJY2f  
 //}}AFX_DATA_MAP ]B2%\}c  
} k#oe:u`<  
'PS_|zI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p.ks jD  
//{{AFX_MSG_MAP(CCaptureDlg) j*6>{_[  
 ON_WM_SYSCOMMAND() wni^qs.i@3  
 ON_WM_PAINT() +lhjz*0  
 ON_WM_QUERYDRAGICON() ZL7#44  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !*\ J4bJe  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >d9b"T  
 ON_BN_CLICKED(ID_CHANGE, OnChange) )wM881_!  
//}}AFX_MSG_MAP )w_hbU_Pb&  
END_MESSAGE_MAP() aA6m5  
y),yks?iv  
BOOL CCaptureDlg::OnInitDialog() >53Hqzm&  
{ ;"9$LHH*  
 CDialog::OnInitDialog(); nu6p{_M  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B<Zm'hdX  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2{6%+>jB  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B>kVJK`X  
 if (pSysMenu != NULL) !r#36kO  
 { f;`7}7C  
  CString strAboutMenu; 2Kmnt(>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); riu_^!"Z_  
  if (!strAboutMenu.IsEmpty()) ~p!=w#/  
  { d%~OEq1i"  
   pSysMenu->AppendMenu(MF_SEPARATOR); g9.y`o}c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W[G5+*i  
  } DUMC4+i  
 } W}iDT?Qi  
 SetIcon(m_hIcon, TRUE); // Set big icon ul&}'jBr  
 SetIcon(m_hIcon, FALSE); // Set small icon c D5N'3  
 m_Key.SetCurSel(0); ev[!:*6P  
 RegisterHotkey(); mb?r{WCi  
 CMenu* pMenu=GetSystemMenu(FALSE); `gSJEq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2)\g IMt%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u$Wv*;TT%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); sLOkLz"x  
 return TRUE; // return TRUE unless you set the focus to a control ?Z2_y-  
} cl{kCSZo.z  
IQ $/|b/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Htm;N2$d  
{ qCI0[U@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #ULzh&yO  
 { b(Nxk2uv  
  CAboutDlg dlgAbout; peZ'sZ6  
  dlgAbout.DoModal(); *G"}m/j-  
 } NcyE_T  
 else n.b_fkZNr  
 { Fp(-&,L0fc  
  CDialog::OnSysCommand(nID, lParam); zL Sha\X  
 } ~j36(`t  
} S rom@c  
TNF+yj-|X:  
void CCaptureDlg::OnPaint() ,R7RXpP7t  
{ l,k.Jo5  
 if (IsIconic()) aE2Yl  
 { FwpTQix!  
  CPaintDC dc(this); // device context for painting W5(.Hub}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m0,TH[HWGF  
  // Center icon in client rectangle ~(-df>  
  int cxIcon = GetSystemMetrics(SM_CXICON); mum4Uj  
  int cyIcon = GetSystemMetrics(SM_CYICON); cq4sgQ?sW  
  CRect rect; b ~C^cM  
  GetClientRect(&rect); YfUo=ku  
  int x = (rect.Width() - cxIcon + 1) / 2; C5^9D  
  int y = (rect.Height() - cyIcon + 1) / 2; v m.%)F#@  
  // Draw the icon ehV}}1>O  
  dc.DrawIcon(x, y, m_hIcon); {O_`eS  
 } i{7Vh0n3S-  
 else j-k]|0ea}  
 { lbj_ if;  
  CDialog::OnPaint(); 303x|y  
 } wqF_hs(O  
} ~0YRWM;  
`OHdo$Y9  
HCURSOR CCaptureDlg::OnQueryDragIcon() )5ev4Qf  
{ 2&0#'Tb  
 return (HCURSOR) m_hIcon;  +wE>h>?;  
} l:14uWu|  
eEX*\1Gg  
void CCaptureDlg::OnCancel() D"<>! ]@(a  
{ @0D  
 if(bTray) s(r1q$5  
  DeleteIcon(); V?r(;x  
  CDialog::OnCancel(); +-PFISa<r  
} F @uOXNz)  
9)S,c =z83  
void CCaptureDlg::OnAbout() $p\0/  
{ `C)|}qcC  
 CAboutDlg dlg; Og:aflS  
 dlg.DoModal(); yUX<W'-Hev  
} >8EmfjUoc  
;BW-ag \9  
void CCaptureDlg::OnBrowse() ,L;%-}#$  
{ L[. )!c8k  
 CString str; zC WN,K`  
 BROWSEINFO bi; t|v_[Za}Z  
 char name[MAX_PATH]; -"x25~k!?F  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); v4W<_ 7L_  
 bi.hwndOwner=GetSafeHwnd(); MNH-SQB|  
 bi.pszDisplayName=name; n=%D}W  
 bi.lpszTitle="Select folder"; B18?)LA  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; BUU ) Sz  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #F:\_!2c  
 if(idl==NULL) >]/aG!  
  return; tREC)+*\  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); S!g0J}.z  
 str.ReleaseBuffer(); f"d4HZD^  
 m_Path=str; L r9z~T:ED  
 if(str.GetAt(str.GetLength()-1)!='\\') :pGgxO%q  
  m_Path+="\\"; |K'7BK_^J  
 UpdateData(FALSE); I7{ Q\C4  
} S,GM!YZg  
N3|aNQ=X0  
void CCaptureDlg::SaveBmp() +5ue) `  
{ 3bR 6Y[  
 CDC dc; otJHcGv  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4@"n7/<  
 CBitmap bm; Ya ~lPc  
 int Width=GetSystemMetrics(SM_CXSCREEN); FfibR\dhY  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;f~z_3g  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z]k+dJ[-  
 CDC tdc; vU!<-T#  
 tdc.CreateCompatibleDC(&dc); V w5@)l*f  
 CBitmap*pOld=tdc.SelectObject(&bm); 0T<DHPQ1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); sXR}#*8p  
 tdc.SelectObject(pOld); G~19Vv*;  
 BITMAP btm; {p7b\=WB-  
 bm.GetBitmap(&btm); 1l+j^Dt'[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; b-)3MR:4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); W4rh7e4  
 BITMAPINFOHEADER bih; Nq ZR*/BOz  
 bih.biBitCount=btm.bmBitsPixel; ^ZG 3{>  
 bih.biClrImportant=0; g?e-D.pSF  
 bih.biClrUsed=0; S3Sn_zqG  
 bih.biCompression=0; <j^"=UN4#  
 bih.biHeight=btm.bmHeight; IK|W^hH\8  
 bih.biPlanes=1; LO;Z3Q>#0  
 bih.biSize=sizeof(BITMAPINFOHEADER); RLUH[[  
 bih.biSizeImage=size; ~n9-  
 bih.biWidth=btm.bmWidth; 1" #W1im  
 bih.biXPelsPerMeter=0; zHt}`>y&  
 bih.biYPelsPerMeter=0; 1/ vcj~|)t  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e(EXQP2P>  
 static int filecount=0; Jk=d5B  
 CString name; nISfRXU;  
 name.Format("pict%04d.bmp",filecount++); H^0`YQJ3  
 name=m_Path+name; FW!1 0K?  
 BITMAPFILEHEADER bfh; 82~ZPZG  
 bfh.bfReserved1=bfh.bfReserved2=0; OojQG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); mx")cGGQ  
 bfh.bfSize=54+size; `I)ftj%  
 bfh.bfOffBits=54; ] KR\<MJK  
 CFile bf; F(+dX4$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mc}r15:<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); YLe$Vv735  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Mf.:y  
  bf.WriteHuge(lpData,size); .[hbiv#  
  bf.Close(); #>(h!lT_  
  nCount++; GeCyq%dN  
 } Zmr*$,v<y  
 GlobalFreePtr(lpData); sp&)1?!M  
 if(nCount==1) gj<Y+Dv>  
  m_Number.Format("%d picture captured.",nCount); t 4tXLI;'  
 else 2 NrMse  
  m_Number.Format("%d pictures captured.",nCount);  o0Pc^  
  UpdateData(FALSE); +}@6V4BRn  
} #e(P~'A0  
a>/jW-?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *q+z5G;O  
{ 'CC;=@J  
 if(pMsg -> message == WM_KEYDOWN) oB]   
 { U0t~H{-H  
  if(pMsg -> wParam == VK_ESCAPE) qra5&Fvb  
   return TRUE; H:&|q+K=#  
  if(pMsg -> wParam == VK_RETURN) (vqI@fB';u  
   return TRUE; ~pj/_@S@x  
 } OBJk\j+Wi  
 return CDialog::PreTranslateMessage(pMsg); 4?F7%^vr  
} y |E {]  
6=xbi{m$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \IG"Te  
{ 4'ymPPY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Xv1mjHZCC  
  SaveBmp(); qOd*9AS'|M  
  return FALSE; =/]d\JSp  
} ,6FmU$ Kn  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,c\3b)ax  
 CMenu pop; f MDM\&f  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |UZhMF4/-L  
 CMenu*pMenu=pop.GetSubMenu(0); C!r9+z)<  
 pMenu->SetDefaultItem(ID_EXITICON); 6Jf\}^4@k  
 CPoint pt; _& qM^  
 GetCursorPos(&pt); {=GWQn6cc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fb||q-E  
 if(id==ID_EXITICON) %T:7I[f  
  DeleteIcon(); -H;p +XAY  
 else if(id==ID_EXIT) ]$gBX=  
  OnCancel(); 4)=\5wJDg1  
 return FALSE; /\&Wk;u3  
} Q-LDFnOFwp  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); muqIh!nn  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =7WE   
 AddIcon(); 09 >lx$  
 return res; rM?ox  
} (e$/@3*  
C/L+:b&x~  
void CCaptureDlg::AddIcon() p|b&hgA  
{ U~e^  
 NOTIFYICONDATA data; ,/P)c*at5  
 data.cbSize=sizeof(NOTIFYICONDATA); ~J:"sUR  
 CString tip; R^=)Ucj  
 tip.LoadString(IDS_ICONTIP); C3 m#v[+  
 data.hIcon=GetIcon(0); z|gG%fM  
 data.hWnd=GetSafeHwnd(); 47c` ) *Hc  
 strcpy(data.szTip,tip); ihr l!A5  
 data.uCallbackMessage=IDM_SHELL; z a^s%^:yK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; N7`<t&T@  
 data.uID=98; 'F665  
 Shell_NotifyIcon(NIM_ADD,&data); + ^9;<>P  
 ShowWindow(SW_HIDE); #n_uELE  
 bTray=TRUE;  `xpU  
} n xc35  
v9[[T6t/'  
void CCaptureDlg::DeleteIcon() =5-|H;da  
{ -bHfo%"^TT  
 NOTIFYICONDATA data; %)K)h&m  
 data.cbSize=sizeof(NOTIFYICONDATA); 3g#fX{e_5!  
 data.hWnd=GetSafeHwnd(); J0hY~B~X  
 data.uID=98; Q*+_%n1 /  
 Shell_NotifyIcon(NIM_DELETE,&data); 8VwByk8  
 ShowWindow(SW_SHOW); `Oc`I9  
 SetForegroundWindow(); A%G \ AT  
 ShowWindow(SW_SHOWNORMAL); jBvZ>H+w~  
 bTray=FALSE; nPj+mg  
} |# zznT"  
m j{ /'  
void CCaptureDlg::OnChange() ,DT =(  
{ &x(^=sTHI  
 RegisterHotkey(); W*xz 0  
} H...!c1M@  
$^2 j#]uX  
BOOL CCaptureDlg::RegisterHotkey() kOfu7Zj  
{ U 6y ;V  
 UpdateData(); I\0mmdi73  
 UCHAR mask=0; h%Nbx:vKk  
 UCHAR key=0; EuAJ.n  
 if(m_bControl) [p +h b  
  mask|=4; J!@$lyH  
 if(m_bAlt) J jCzCA:K_  
  mask|=2; FshQ OFW  
 if(m_bShift) ?^F#}>C  
  mask|=1; c{Ax{-'R  
  key=Key_Table[m_Key.GetCurSel()]; "/).:9],}  
 if(bRegistered){ xi6Fs, 2S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w@P c7$EP  
  bRegistered=FALSE; ]3iu-~  
 } b|c?xHF}K  
 cMask=mask;  KUfk5Y  
 cKey=key; K/ q:aMq  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -IR9^)  
 return bRegistered; `A\ !Gn?   
} >9f-zv(n  
|5}{4k~9J  
  四、小结 a4 g~'^uC  
0;Y_@UVj  
  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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