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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: =/QU$[7X(  
  7O9hn2?e  
  一、实现方法 Sc$8tLDLj  
?&<o_/`-H5  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: IgR"eu U  
pvQK6r  
#pragma data_seg("shareddata") <6O _t,K]  
HHOOK hHook =NULL; //钩子句柄 bb/?02*)H  
UINT nHookCount =0; //挂接的程序数目 grxl{uIC8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 S O:V|Tfj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 m5em<P!G  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9C)3 b3  
static int KeyCount =0; SM#S/|.]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 FJ(B]n[>  
#pragma data_seg() m":SE?{{&  
X*9N[#wu6  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 8u'O` j  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: P&%eIgAOL  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #W%)$k c  
cKey,UCHAR cMask)  c(V=.+J  
{ %w8GGm8^/  
 BOOL bAdded=FALSE; uQu/(5  
 for(int index=0;index<MAX_KEY;index++){ )o9Q5Lq  
  if(hCallWnd[index]==0){ v"~Do+*+  
   hCallWnd[index]=hWnd; 6vgBqn[  
   HotKey[index]=cKey; Zv|p>q`R2  
   HotKeyMask[index]=cMask; Z<ajET`)  
   bAdded=TRUE; 4g7ja   
   KeyCount++; %h"qMs S  
   break; cZgMA8 F  
  } 7Y32p'  
 } 4N~+G `  
 return bAdded; Lvi[*une|  
} +:>JZ$  
//删除热键 JvfQib  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3duG.iUlL  
{ ,jRcl!n`  
 BOOL bRemoved=FALSE; LZM,QQ  
 for(int index=0;index<MAX_KEY;index++){ iUIy,Y  
  if(hCallWnd[index]==hWnd){ a#+>w5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6x_ T@  
    hCallWnd[index]=NULL; 20UqJM8 Ot  
    HotKey[index]=0; q]6_ rY.  
    HotKeyMask[index]=0; ?0rOcaTY  
    bRemoved=TRUE; >*dQqJI  
    KeyCount--; !TP6=ks  
    break; )?w&oIj5  
   } 4E=0qbt8  
  } 4K9Rpm  
 } N%9h~G  
 return bRemoved; ~->Hlxze'K  
} G HD^%)T5^  
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  DLL中的钩子函数如下: #B @X  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j2|XD Of  
{ "~u_\STn <  
 BOOL bProcessed=FALSE;  ~~PgF"v  
 if(HC_ACTION==nCode) :GQ UM6  
 { u8Y~_)\MA  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZCm1+Y$  
   switch(wParam) Wk@ eV\H71  
   {  &Hv;<  
    case VK_MENU: $ye^uu;Z  
     MaskBits&=~ALTBIT; ;}LJh8_  
     break; VS?dvZ1cC  
    case VK_CONTROL: 81Z4>F:  
     MaskBits&=~CTRLBIT; B4Q79gEh=  
     break; EMLx?JnP  
    case VK_SHIFT: 9"~9hOEct  
     MaskBits&=~SHIFTBIT; D%-{q>F!gf  
     break; j"5Pe  
    default: //judge the key and send message <}d/v_+pnh  
     break; R1}IeeZO?&  
   } yI8 SQ$w0y  
   for(int index=0;index<MAX_KEY;index++){ OR]T`meO  
    if(hCallWnd[index]==NULL) E *BSfn&i  
     continue; L?!$EPr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q uB+vL  
    { Q:mZ" i5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lr WLN  
     bProcessed=TRUE; Jy9bY  
    }  l^P#kQA  
   } lX"bN=E?!  
  } +@0TMK,P  
  else if((lParam&0xc000ffff)==1){ //有键按下 \^LWCp,C"  
   switch(wParam) Km,*)X.-5  
   { 8W;2oQN7  
    case VK_MENU: =L"^.c@  
     MaskBits|=ALTBIT; =`-|&  
     break; ZRnL_ z~  
    case VK_CONTROL: [(|^O>k8c  
     MaskBits|=CTRLBIT; UFe(4]^  
     break; i}B;+0<drx  
    case VK_SHIFT: Lj8)' [K"  
     MaskBits|=SHIFTBIT; ZHCr2^w6  
     break; Ea4_Qmn  
    default: //judge the key and send message 2U}m RgJu  
     break; kh3<V'k]  
   } |g<*Rk0  
   for(int index=0;index<MAX_KEY;index++){ ! RPb|1Y}+  
    if(hCallWnd[index]==NULL) Iq^if>  
     continue; @DuK#W"E u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A "S/^<  
    { \gItZ}+c4}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i.y=8GxY  
     bProcessed=TRUE; _ij$f<  
    } EY=FDlV  
   } 7)^:8I(  
  } i)8N(HN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #f*g]p{   
   for(int index=0;index<MAX_KEY;index++){ >&WhQhZ3kg  
    if(hCallWnd[index]==NULL) ,."b3wR[w  
     continue; F\:(*1C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /ZW&0 E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wzh ]97b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 L\e>B>u  
   } f8'MP9Lv  
  } FRZs[\I|iT  
 } 'e@=^FC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Yp1bH+/u  
} *5OCqU+g  
c2*`2qK#  
  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: qaVy.  
!VP %v&jKm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T5|c$doQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r &%.z*q  
 ^$-Ye]<  
  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: s+Q;pRZW{  
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y&oNv xG-  
{ g%a|q~)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ys'T~Cs  
 { g=l:cVr8y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iiG f'@/  
  SaveBmp(); syPWs57pH  
  return FALSE; QI}E4-s8  
 } aWy]9F&C:  
 …… //其它处理及默认处理 JOb MZA$  
} uD9|.P}  
7dOyxr"H-  
zt=0o| k  
  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。 %Dig)<yx  
<>Y?v C  
  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。 &dR=?bz-A  
iv&v8;B  
  二、编程步骤 q,%:h`t\  
cz/Q/%j$/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; z[EFQ^*>  
yT8=l"-[G  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +jP~s  
WYrI|^[>  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6#e::GD  
lfN~A"X  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; JC#>Td  
.S?pG_n]f  
  5、 添加代码,编译运行程序。 p'94SXO_  
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三、程序代码 &miexSNeF  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL !>z:m!MlQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) beXNrf=bG  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :6{`~=  
#if _MSC_VER > 1000 )C hqATKg  
#pragma once ^U[D4UM  
#endif // _MSC_VER > 1000 *|#T8t,}n  
#ifndef __AFXWIN_H__ Vz=auM1xZ  
#error include 'stdafx.h' before including this file for PCH TX [%(ft  
#endif ^dm!)4W  
#include "resource.h" // main symbols u3 0s_\  
class CHookApp : public CWinApp xiblPF_n3  
{ Jc6R{C  
 public: {eS|j=  
  CHookApp(); dt}_D={Be  
  // Overrides 9W ^xlid6  
  // ClassWizard generated virtual function overrides Ro(Zmk\t  
  //{{AFX_VIRTUAL(CHookApp) 6NWn(pZ]p  
 public: pah'>dAL  
  virtual BOOL InitInstance();  |>^JRx  
  virtual int ExitInstance(); \*?~Yj #  
  //}}AFX_VIRTUAL G~a ZJ,  
  //{{AFX_MSG(CHookApp) ]s'as9s9  
  // NOTE - the ClassWizard will add and remove member functions here. Q3~H{)[Kq  
  // DO NOT EDIT what you see in these blocks of generated code ! Nh|uO?&C6  
  //}}AFX_MSG ; DR$iH-F  
  DECLARE_MESSAGE_MAP() t{9GVLZ  
}; #zs~," dRv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;igIZ$&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c)85=T6*aA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^{`exCwM x  
BOOL InitHotkey(); .~;\eW[  
BOOL UnInit(); Sz`,X0a  
#endif RtS+<^2a;  
? OM!+O  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !f [_+CD  
#include "stdafx.h" @,+5y\]C  
#include "hook.h" H*R"ntI?w  
#include <windowsx.h> q54]1TQ  
#ifdef _DEBUG tDcT%D {:  
#define new DEBUG_NEW 90rol~M&  
#undef THIS_FILE =UQ3HQD  
static char THIS_FILE[] = __FILE__; Btn?N  
#endif 7n<{tM  
#define MAX_KEY 100 !Ai@$tl[S  
#define CTRLBIT 0x04 j,eo2HaL  
#define ALTBIT 0x02 Zu[su>\  
#define SHIFTBIT 0x01 _V6ukd"B~  
#pragma data_seg("shareddata") b8UO,fY q  
HHOOK hHook =NULL; wn%A4-%{  
UINT nHookCount =0; p6V0`5@t  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $6 f3F?y7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^ZcGY+/~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {!L~@r  
static int KeyCount =0; /([kh~a  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;)*eo_tQ  
#pragma data_seg() %tGO?JMkd  
HINSTANCE hins; ^yp{32  
void VerifyWindow(); N4!O.POP  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ti5-6%~&  
//{{AFX_MSG_MAP(CHookApp) 6 H$FhJF  
// NOTE - the ClassWizard will add and remove mapping macros here. -Q*gW2KmV  
// DO NOT EDIT what you see in these blocks of generated code! O^ yG?b  
//}}AFX_MSG_MAP 24eLB? H  
END_MESSAGE_MAP() q0vQ a  
,f>k%_U}  
CHookApp::CHookApp() Y:[u1~a  
{ *GPiOA a  
 // TODO: add construction code here, Vc Z3 X4/  
 // Place all significant initialization in InitInstance #X1ND  
} |Rk@hzM2S  
0GeTS Fj  
CHookApp theApp; WOap+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TC*g|d @b  
{ #*Ctwl,T  
 BOOL bProcessed=FALSE; 3s#N2X;Bc  
 if(HC_ACTION==nCode) y<Ot)fa$  
 { F]&*o w  
  if((lParam&0xc0000000)==0xc0000000){// Key up +mn[5Y}:  
   switch(wParam) q/,O\,  
   { X \/#@T  
    case VK_MENU: NBGH_6DROw  
     MaskBits&=~ALTBIT; kuP(r  
     break; sXPe/fWo  
    case VK_CONTROL: )SGq[B6@I  
     MaskBits&=~CTRLBIT; {`@G+JV~Jw  
     break; |CyE5i0  
    case VK_SHIFT: 4kx N<]  
     MaskBits&=~SHIFTBIT; [4f{w%~^  
     break; j\M?~=*w  
    default: //judge the key and send message @o`AmC . 8  
     break; > ~O.@|  
   } Gd85kY@w7  
   for(int index=0;index<MAX_KEY;index++){ JWxwJex  
    if(hCallWnd[index]==NULL) gPPkT"  
     continue; RA L~!"W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  @q) d  
    { lThB2/tV\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [7y]n;Fy  
     bProcessed=TRUE; 8":Q)9;%  
    } SmO~,2=  
   } K}Qa~_  
  } WpvhTX  
  else if((lParam&0xc000ffff)==1){ //Key down % pCTN P  
   switch(wParam) es7=%!0  
   { &oMh]Z*:  
    case VK_MENU: "w<#^d_6  
     MaskBits|=ALTBIT; kAUymds;O  
     break; ef4 i:.  
    case VK_CONTROL: ~P-mC@C  
     MaskBits|=CTRLBIT; CrTw@AW9)  
     break; p!%pP}I  
    case VK_SHIFT: G3T]`Atf  
     MaskBits|=SHIFTBIT; |[8Th4*n  
     break; 9\(| D#  
    default: //judge the key and send message Q3?F(ER@  
     break; p]c%f 2E>d  
   } ;O,jUiQ  
   for(int index=0;index<MAX_KEY;index++) hhvyf^o   
   { 4*;MJ[|  
    if(hCallWnd[index]==NULL) %?/X=}sE  
     continue; dWBA1p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m1AJ{cs  
    { om>KU$g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y'X%Aw;`  
     bProcessed=TRUE; E]r?{t`]  
    } H\[W/"  
   } 1$ {SRU7l  
  } Tlr v={  
  if(!bProcessed){ f|(M.U-  
   for(int index=0;index<MAX_KEY;index++){ (/] J3  
    if(hCallWnd[index]==NULL) u ^RxD^=L  
     continue; klhtKp_p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TA~{1_l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <~=Vg  
   } ],].zlN  
  } % & bY]w  
 } e+K^A q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *Pg2c(Vg  
} 93hxSRw  
2:ylv<\$  
BOOL InitHotkey() ybUaTD@?}b  
{ e96k{C`j0  
 if(hHook!=NULL){ TL#3;l^  
  nHookCount++; NGWxN8P6  
  return TRUE; RG`1en  
 } ;A[Q2(w+  
 else jz0T_\8D`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U/BR*Zn]*  
  if(hHook!=NULL) #e5\j\#.  
   nHookCount++; T[j,UkgGo  
  return (hHook!=NULL); u#SWj,X  
} F6dP,(  
BOOL UnInit() ct}9i"H#1  
{ "zy7C*)>r  
 if(nHookCount>1){ LreP4dRe  
  nHookCount--; `9.r`&T6K  
  return TRUE; .%QXzIa3F  
 } uW3!Yg@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v*yuE5{  
 if(unhooked==TRUE){ 7VI*N)OZ8  
  nHookCount=0; $, '*f?d  
  hHook=NULL; 5/z/>D;  
 } {1 94!S4z  
 return unhooked; }o{(S%%  
} & ZB  
s"?3]P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3oG,E;(  
{ {FTqu.  
 BOOL bAdded=FALSE; ws^ np  
 for(int index=0;index<MAX_KEY;index++){ PnG-h~Y3N  
  if(hCallWnd[index]==0){ GvlS%  
   hCallWnd[index]=hWnd; ;6hOx(>`=  
   HotKey[index]=cKey; $u6 3]rypm  
   HotKeyMask[index]=cMask; gltBC${7wZ  
   bAdded=TRUE; YT8F#t8  
   KeyCount++; ua `RJ  
   break; 1g~R/*Jo  
  } Nl1D o:PY  
 } kz7(Z'pw  
 return bAdded; '$QB$2~V  
} K'I#W lg  
pcI uN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;IM}|2zuN  
{ qb` \)X]9  
 BOOL bRemoved=FALSE; :T(|&F[(  
 for(int index=0;index<MAX_KEY;index++){ ,wdD8ZT'Ip  
  if(hCallWnd[index]==hWnd){ Lq!>kT<]!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m9}P9 ?  
    hCallWnd[index]=NULL; B^jc3 VsR  
    HotKey[index]=0; @gXx1hEg  
    HotKeyMask[index]=0; 8qu6.  
    bRemoved=TRUE; ^L&iR0  
    KeyCount--; lCHO;7YHX  
    break; 5d!-G$ @  
   } &XUiKnNW  
  } 1 I",L&S1  
 } % +\. " eC  
 return bRemoved; VTHH&$ZNq  
} (0kK_k'T  
sds"%]r g  
void VerifyWindow() @49S`  
{ 6Sn.I1Wy  
 for(int i=0;i<MAX_KEY;i++){ `,*5wBC  
  if(hCallWnd!=NULL){ 8BNi1Qn$  
   if(!IsWindow(hCallWnd)){ hqkz^!rp  
    hCallWnd=NULL; _``=cc  
    HotKey=0; I4?5K@a  
    HotKeyMask=0; r^ ZEImjc  
    KeyCount--; GF=g<H M  
   } \mlqO[ S  
  } T:W4$P  
 } Jma1N;d  
} S#} KIy  
fZA4q0  
BOOL CHookApp::InitInstance() fXQNHZ|4  
{ FH+s s!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1|-Dj|  
 hins=AfxGetInstanceHandle(); by/jYg)+  
 InitHotkey(); "wh , Ue  
 return CWinApp::InitInstance(); XACm[NY_  
} 'F#KM1s  
lQkQ9##*   
int CHookApp::ExitInstance() n^6j9 FQ7  
{ 0b(N^$js'  
 VerifyWindow(); Z!X0U7& U  
 UnInit(); dL )<% o  
 return CWinApp::ExitInstance(); t |A-9^t'!  
} j]/RC(;?  
"o}+Ciul  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3 xp)a%=7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I83<r9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]yPqLJ  
#if _MSC_VER > 1000 QbpFE)TYJ|  
#pragma once X1vd'>  
#endif // _MSC_VER > 1000 ]1pIj i[  
+pn N!:q  
class CCaptureDlg : public CDialog 0T5L_%c  
{ B%+T2=&$7  
 // Construction /HRFAqep  
 public: )iK6:s #  
  BOOL bTray; bY QRBi  
  BOOL bRegistered; 9.B KI/  
  BOOL RegisterHotkey(); ':m,)G5&  
  UCHAR cKey; 8k1Dj1@0z  
  UCHAR cMask; JQHvz9Yg  
  void DeleteIcon(); gi _5?$  
  void AddIcon(); ` 3K)GA  
  UINT nCount; :^3LvPM  
  void SaveBmp(); g0ly  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i3'9>"`  
  // Dialog Data T\ >a!  
  //{{AFX_DATA(CCaptureDlg) k%QpegN  
  enum { IDD = IDD_CAPTURE_DIALOG }; l u%}h7ng  
  CComboBox m_Key; 9kS^Abtk  
  BOOL m_bControl; &t:Gx<]  
  BOOL m_bAlt; :I^;jdL  
  BOOL m_bShift; x-.?HS[  
  CString m_Path; <.izVD4/Gg  
  CString m_Number; t+T4-1 3a  
  //}}AFX_DATA 2/=l|!JKLz  
  // ClassWizard generated virtual function overrides 6 EC*   
  //{{AFX_VIRTUAL(CCaptureDlg) @;?p&.W`D  
 public: JB]q   
  virtual BOOL PreTranslateMessage(MSG* pMsg); '|p$)yx2  
 protected: Bj-: #P@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @x'"~"%7b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); y0.8A-2:  
  //}}AFX_VIRTUAL c*L\_Vx+  
  // Implementation 6){]1h"  
 protected: Tl[!=S  
  HICON m_hIcon; Vi]W|bP  
  // Generated message map functions 3L}!RB  
  //{{AFX_MSG(CCaptureDlg) 'yG4 LF  
  virtual BOOL OnInitDialog(); }"PU%+J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); yS(fILV  
  afx_msg void OnPaint(); usK*s$ns  
  afx_msg HCURSOR OnQueryDragIcon(); /-+xQn]  
  virtual void OnCancel(); r@t9Ci=}  
  afx_msg void OnAbout(); jiS_G%G  
  afx_msg void OnBrowse(); bITPQ7+  
  afx_msg void OnChange(); g<f <Ip=  
 //}}AFX_MSG ?+W 9az]+  
 DECLARE_MESSAGE_MAP() VZymM<O  
}; .e=:RkI,  
#endif lc,tVe_  
%9N7Ln|%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i}mVQ\j5  
#include "stdafx.h" RcM/!,B  
#include "Capture.h" 2Mvrey)  
#include "CaptureDlg.h" ^l=!JP=M=  
#include <windowsx.h> ]X5 9  
#pragma comment(lib,"hook.lib") au+kNF|Q  
#ifdef _DEBUG dDGgvi|[Mz  
#define new DEBUG_NEW EwC{R`  
#undef THIS_FILE e .2ib?8  
static char THIS_FILE[] = __FILE__; 9- YwkK#z  
#endif ]#l/2V1  
#define IDM_SHELL WM_USER+1 TKY*`?ct  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KgiJUO`PR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L> 9V&\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X>(TrdK_9"  
class CAboutDlg : public CDialog SmdjyK1~8  
{ Q<'nE  
 public: v7jq@#-   
  CAboutDlg(); !GLz)#SBl  
  // Dialog Data +HeTtFo{M  
  //{{AFX_DATA(CAboutDlg) 1[qLA!+  
  enum { IDD = IDD_ABOUTBOX }; Xti[[sJ  
  //}}AFX_DATA s(%oTKjt  
  // ClassWizard generated virtual function overrides PMh^(j[  
  //{{AFX_VIRTUAL(CAboutDlg) k*E\B@W>  
 protected: ;WM"cJo9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cc&axc7I  
  //}}AFX_VIRTUAL !*m5F8Qm?A  
  // Implementation +!z{5:  
 protected: wEE\+3b)  
  //{{AFX_MSG(CAboutDlg) [16cFqD  
  //}}AFX_MSG RwPN gRF  
  DECLARE_MESSAGE_MAP() &8>IeK {I  
}; )Xak JU^o  
=aj/,Q]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X*39c b(b  
{ ng:9 l3 x  
 //{{AFX_DATA_INIT(CAboutDlg) ~Ro9u p  
 //}}AFX_DATA_INIT s3O} 6  
} Q`D~5ci  
YW`,v6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (TwnkXrR,  
{ "@d[h,TM  
 CDialog::DoDataExchange(pDX); wsN?[=l{s  
 //{{AFX_DATA_MAP(CAboutDlg) ? glSC$b  
 //}}AFX_DATA_MAP IOoz^/'  
} 'fF;(?  
a /#PLP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) S<u-n8bv  
 //{{AFX_MSG_MAP(CAboutDlg) 9C[ywp  
 // No message handlers lR[qqFR  
 //}}AFX_MSG_MAP =%gRW5R%  
END_MESSAGE_MAP() Y"Ql!5=  
,(?po (']  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #hf ak  
: CDialog(CCaptureDlg::IDD, pParent) \2}bi:e 6  
{ h0-hT   
 //{{AFX_DATA_INIT(CCaptureDlg) /D^"X 4!"  
  m_bControl = FALSE; :GW&O /Yo  
  m_bAlt = FALSE; 1_ C]*p  
  m_bShift = FALSE; %1O[i4s:-  
  m_Path = _T("c:\\"); Bj}^\Pc;}  
  m_Number = _T("0 picture captured."); {>,V\J0p  
  nCount=0; + 33@?fl.  
  bRegistered=FALSE; %Gj8F4{  
  bTray=FALSE; '|*?*6q  
 //}}AFX_DATA_INIT Yd=a}T  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9^Whg ~{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >teO m?@U  
} _ozg_E  
?a8(a zn  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z$GoaS(  
{ (85Fv&a  
 CDialog::DoDataExchange(pDX); IWveW8qJ  
 //{{AFX_DATA_MAP(CCaptureDlg) & jczO-R^  
  DDX_Control(pDX, IDC_KEY, m_Key); 13%t"-@bh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^;maotHn  
  DDX_Check(pDX, IDC_ALT, m_bAlt); MpqZH{:?G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); CI :`<PZ\-  
  DDX_Text(pDX, IDC_PATH, m_Path); S h,&{z!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'd&0Js$^  
 //}}AFX_DATA_MAP \nB8WSvk2W  
} 4jBC9b}O  
<~!Hx+j   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !x>%+&c>k  
//{{AFX_MSG_MAP(CCaptureDlg) T?1Du"d8  
 ON_WM_SYSCOMMAND() lGk{LO)  
 ON_WM_PAINT() pY~,(s|Qb  
 ON_WM_QUERYDRAGICON() b0A1hb[|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) f1)x5N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V$icWu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D8nD/||;Z  
//}}AFX_MSG_MAP 5qkH|*Z3  
END_MESSAGE_MAP() k`9)=&zX+  
`S.ZS}~!F  
BOOL CCaptureDlg::OnInitDialog() )0e2ic/  
{ xD /9F18  
 CDialog::OnInitDialog(); aKlUX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;?~$h-9)  
 ASSERT(IDM_ABOUTBOX < 0xF000); |*Yf.-  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  4)4+M  
 if (pSysMenu != NULL) @]c(V%x   
 { hj$ e|arB  
  CString strAboutMenu; 8kOKwEX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N0w`!<y:c  
  if (!strAboutMenu.IsEmpty()) +|{RE.DL  
  { X3:XTuV   
   pSysMenu->AppendMenu(MF_SEPARATOR); RQB]/D\BO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h:)Ci!D;  
  } P^Q[-e{  
 } B_l{<  
 SetIcon(m_hIcon, TRUE); // Set big icon ^(f4*m6`  
 SetIcon(m_hIcon, FALSE); // Set small icon d:q +  
 m_Key.SetCurSel(0); Xy5s^82?  
 RegisterHotkey(); j0GMTri3  
 CMenu* pMenu=GetSystemMenu(FALSE); y}K\%;`[a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T<joR R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u=NS sTP&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0\~Z5k`IT  
 return TRUE; // return TRUE unless you set the focus to a control \[>9UC%  
} %|l8f>3[  
%q322->Z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hv$m4,0WB  
{ EQIo5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {"H2 :-t<  
 { 1?Aga,~k:a  
  CAboutDlg dlgAbout; ph|ZG6:  
  dlgAbout.DoModal(); $BDBN_p  
 } yag}fQ(XH  
 else q *AQq=  
 { o{kbc5_  
  CDialog::OnSysCommand(nID, lParam); Koln9'tB  
 } {8EW)4Hf  
}  /n^c>)  
4^' 3&vu  
void CCaptureDlg::OnPaint() m&oi8 P-6  
{ x/MZ(A%D  
 if (IsIconic()) ^D_/=4rz8  
 { *Sf -; U  
  CPaintDC dc(this); // device context for painting z ggB$5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YEx)"t8E  
  // Center icon in client rectangle "$5\,  
  int cxIcon = GetSystemMetrics(SM_CXICON); wVA|!>v  
  int cyIcon = GetSystemMetrics(SM_CYICON); XfzVcap  
  CRect rect; Lj %{y.Rj  
  GetClientRect(&rect); q 'a  
  int x = (rect.Width() - cxIcon + 1) / 2; "?GebA  
  int y = (rect.Height() - cyIcon + 1) / 2; ~Z lC '  
  // Draw the icon '7B"(dA&C  
  dc.DrawIcon(x, y, m_hIcon); \hP=-J[~C  
 } $O:w(U  
 else Vjm_F!S  
 { M}"r#Plq  
  CDialog::OnPaint(); yISD/ g  
 } w*w?S  
} .`Zf}[5[  
<;t)6:N\  
HCURSOR CCaptureDlg::OnQueryDragIcon() I#FF*@oeM  
{ hvt@XZT  
 return (HCURSOR) m_hIcon; m>e3vu  
} dYojm1MQ  
;}.Kb  
void CCaptureDlg::OnCancel() {sv{847V  
{ iY/KSX^~O  
 if(bTray) o8FXqTUcs4  
  DeleteIcon(); q cA`)j  
  CDialog::OnCancel(); qturd7  
} dj[apuiF  
4*UP. r@  
void CCaptureDlg::OnAbout() :PnSQjV:  
{ jB^OP1  
 CAboutDlg dlg; P8gX CX!>U  
 dlg.DoModal(); [ij,RE7,T  
} {R&ZqEo'D  
;? uC=o>Z{  
void CCaptureDlg::OnBrowse() _NdLcpBT?  
{ yNJAWM7  
 CString str; a~^Srj!}x  
 BROWSEINFO bi; =O{~Q3z@s  
 char name[MAX_PATH]; 'CS.p!Z\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); HrqF![_  
 bi.hwndOwner=GetSafeHwnd(); XqR{.jF.  
 bi.pszDisplayName=name; T"E(  F  
 bi.lpszTitle="Select folder"; 02]xJo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; GZ0aOpUWVq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); WY)^1Gb$ux  
 if(idl==NULL) s"0b%0?A  
  return; ^4`&EF  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,R-Y~+!  
 str.ReleaseBuffer(); h <[+HsI  
 m_Path=str; +~|AT+|iI  
 if(str.GetAt(str.GetLength()-1)!='\\') 1}`LTPW9  
  m_Path+="\\"; RyRqH:p)3  
 UpdateData(FALSE); '%3{jc-}  
} LnMwx#^*  
,\h YEup  
void CCaptureDlg::SaveBmp() _Nu` )m  
{ j+748QAhh  
 CDC dc; bGh0<r7R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {u 30r c"  
 CBitmap bm; c%YDt`  
 int Width=GetSystemMetrics(SM_CXSCREEN); A:Rw@ B$  
 int Height=GetSystemMetrics(SM_CYSCREEN); t58m=4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); TIRHT`"i  
 CDC tdc;  ~B@ }R  
 tdc.CreateCompatibleDC(&dc); cq^sq1A:  
 CBitmap*pOld=tdc.SelectObject(&bm); NR/-m7#-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |Odu4 Q  
 tdc.SelectObject(pOld); .Y/-8H-3v  
 BITMAP btm; S+*cbA{J|  
 bm.GetBitmap(&btm); ;x>;jS.t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~! Lw1]&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .w FU:y4r  
 BITMAPINFOHEADER bih; Io+IRK  
 bih.biBitCount=btm.bmBitsPixel; REx[`x,GUh  
 bih.biClrImportant=0; mM xHR$2  
 bih.biClrUsed=0; (4)3W^/kk?  
 bih.biCompression=0; 8 G?b.NE^  
 bih.biHeight=btm.bmHeight; V}`M<A6:  
 bih.biPlanes=1; *t =i  
 bih.biSize=sizeof(BITMAPINFOHEADER); tvWH04T  
 bih.biSizeImage=size; KHJ=$5r)  
 bih.biWidth=btm.bmWidth; mW$ot.I  
 bih.biXPelsPerMeter=0; -iQsi4  
 bih.biYPelsPerMeter=0; Z oTNm  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); urxqek  
 static int filecount=0; w?ai,Pw  
 CString name; `p"U  
 name.Format("pict%04d.bmp",filecount++); CSL4P)  
 name=m_Path+name; *!u?  
 BITMAPFILEHEADER bfh; Rc7.M"wzjX  
 bfh.bfReserved1=bfh.bfReserved2=0; f sX;Nj]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A[Cg/ +Z  
 bfh.bfSize=54+size; A1!:BC  
 bfh.bfOffBits=54; U~g@TfU;  
 CFile bf; 3GWrn ,f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {dZ8;Fy4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9XN~Ln@}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2<.Vv\ =  
  bf.WriteHuge(lpData,size); cJ4S!  
  bf.Close(); )K.R\]XR  
  nCount++; CI1m5g [P  
 } S^g]:Xh&  
 GlobalFreePtr(lpData); Fr/QW7B5  
 if(nCount==1) xDe47&qKM  
  m_Number.Format("%d picture captured.",nCount); ]EX--d<_`  
 else 7+] F^ 6  
  m_Number.Format("%d pictures captured.",nCount); B=x~L  
  UpdateData(FALSE); T.euoFU{Z  
} k*9%8yi_ U  
{1HB!@%,(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xfU hSt  
{ vcD'~)G(*  
 if(pMsg -> message == WM_KEYDOWN) g&aT!%QvX+  
 { W,'3D~g8  
  if(pMsg -> wParam == VK_ESCAPE) 'h:!m/1  
   return TRUE; >huqt|S*9  
  if(pMsg -> wParam == VK_RETURN) { ;' :h  
   return TRUE; pqd4iR Wv  
 } 1'OD3~[R  
 return CDialog::PreTranslateMessage(pMsg); 7#/|VQX<A  
} Oylp:_<aT  
L3' \r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <wqRk<  
{ 9e76 pP(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $@4e(Zrmo  
  SaveBmp(); .kzms  
  return FALSE; 9w$7VW;  
} Ty iU1,oO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [EcV\.  
 CMenu pop; 9/Q S0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); GfQ^@Tl  
 CMenu*pMenu=pop.GetSubMenu(0); !%)L&W_  
 pMenu->SetDefaultItem(ID_EXITICON); ]LY^9eK)>{  
 CPoint pt; 4] M =q{  
 GetCursorPos(&pt); HO G=c!b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kOzt"t&  
 if(id==ID_EXITICON) :'b%5/ ^q  
  DeleteIcon(); +"G(  
 else if(id==ID_EXIT) /T4VJ{D  
  OnCancel(); }W)Mwu'W  
 return FALSE; _/8y1) I  
} (T`q++  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %L.rcbg:<c  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) c8!j6\dC*  
 AddIcon(); /TG| B Eb  
 return res;  2w;G4  
} +;5Wp$ M\  
f>b!-|  
void CCaptureDlg::AddIcon() {K6Kx36  
{ fLc!Sn.Y  
 NOTIFYICONDATA data; 1pl2;!  
 data.cbSize=sizeof(NOTIFYICONDATA); MgSp.<!  
 CString tip; U &f#V=Rg  
 tip.LoadString(IDS_ICONTIP); FW5*_%J  
 data.hIcon=GetIcon(0); "&s9cO.H  
 data.hWnd=GetSafeHwnd(); +,:nm_kQU  
 strcpy(data.szTip,tip); d"Ml^rAn  
 data.uCallbackMessage=IDM_SHELL; eF*TLI<[^I  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?cA8P.?^A  
 data.uID=98; /7S-|%1  
 Shell_NotifyIcon(NIM_ADD,&data); 6Eij>{v  
 ShowWindow(SW_HIDE); 1'gKZB)TG7  
 bTray=TRUE; s n=zh1 A  
} &8o  :  
LJ:mJ#  
void CCaptureDlg::DeleteIcon() 3/ yt*cr  
{ Q;d+]xj  
 NOTIFYICONDATA data; 5>0\e_V  
 data.cbSize=sizeof(NOTIFYICONDATA); 1 yxZ  
 data.hWnd=GetSafeHwnd(); &! 5CwEIF  
 data.uID=98; 8b8e^\l(  
 Shell_NotifyIcon(NIM_DELETE,&data); RcKQER  
 ShowWindow(SW_SHOW); I%.jc2kK  
 SetForegroundWindow(); & bp#1KR)  
 ShowWindow(SW_SHOWNORMAL); L5i#Kh_  
 bTray=FALSE; #r78Ym'aI  
} p3>Q<  
,'/HcF?yf  
void CCaptureDlg::OnChange() Ncs4<"{$  
{ )M&I)In'  
 RegisterHotkey(); v^FV t  
} `!5tH?bX  
F}VS)  
BOOL CCaptureDlg::RegisterHotkey() c %6 @ z  
{ JI{OGr  
 UpdateData(); ZEXj|wC  
 UCHAR mask=0; @ U7#, G  
 UCHAR key=0; >b/k|?xP  
 if(m_bControl) bahc{ZC2  
  mask|=4; wz|Q%.%?[  
 if(m_bAlt) Wme1Uid  
  mask|=2; w[J (E  
 if(m_bShift) M+;!]tbc3  
  mask|=1; 4jq`No_  
  key=Key_Table[m_Key.GetCurSel()]; r P<d[u  
 if(bRegistered){ ` maN5)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); h>mBkJ {  
  bRegistered=FALSE; CguU+8 ]  
 } uHujw.H/y  
 cMask=mask; /S2p``E+  
 cKey=key; +lk\oj$S+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (<g;-pZH%  
 return bRegistered; /o}0oo5B  
} )U/@J+{{  
leX7(Y;!a7  
  四、小结 Fh3Dc 83~  
T[8"u<O96  
  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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