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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: oA@M =  
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  一、实现方法 _z8"r&  
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  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:  J]XLWAM  
t!SxJ B e  
#pragma data_seg("shareddata") <5}I6R;  
HHOOK hHook =NULL; //钩子句柄 ygj%VG  
UINT nHookCount =0; //挂接的程序数目 U~)5{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :9ia|lN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HR"clD\{Di  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ]u!s-=3s  
static int KeyCount =0; ZS4dW_*[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yo->mD  
#pragma data_seg() *$|f9jVh  
^|p D(v  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 LH)1IGAx2y  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: d~rA`!s7`  
^)Awjj9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5,s@K>9l;  
cKey,UCHAR cMask) F-rhxJd  
{ ]&"ii  
 BOOL bAdded=FALSE; 1fMV$T==K  
 for(int index=0;index<MAX_KEY;index++){ %J9u?-~  
  if(hCallWnd[index]==0){ !-^oU"  
   hCallWnd[index]=hWnd; u"V,/1++\  
   HotKey[index]=cKey; > ^zNKgSQ  
   HotKeyMask[index]=cMask; q[W6I9  
   bAdded=TRUE; Khi;2{`  
   KeyCount++; 6E K<9M  
   break; 5,##p"O(  
  } -dO8Uis$  
 } q4w]9b/  
 return bAdded; p+|8(w9A${  
} z9 Ch %A{  
//删除热键 ;`LG WT-<F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,$ /Ld76U  
{ 5I1YB+$}e  
 BOOL bRemoved=FALSE; nRB3VsL  
 for(int index=0;index<MAX_KEY;index++){  R*2N\2  
  if(hCallWnd[index]==hWnd){ JxwKTFU'3O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !J<Xel {  
    hCallWnd[index]=NULL; 21tv(x  
    HotKey[index]=0; J&fIW Z  
    HotKeyMask[index]=0; 4-SU\_  
    bRemoved=TRUE; Pg:xC9w4  
    KeyCount--; &z40l['4bz  
    break; 4gC(zJ  
   } @O'NJh{D`  
  } U)Hc 7% e  
 } X>yDj]*4P  
 return bRemoved; )Jk$j  
} "5<!   
><D2of|  
&8l?$7S"_/  
  DLL中的钩子函数如下: aReJ@  
0C%IdV%CU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,'HjL:r  
{ )Cj1VjAg  
 BOOL bProcessed=FALSE; M0xhcU_  
 if(HC_ACTION==nCode) G.<0^q,  
 { WwTl|wgvyI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 M>m!\bb%.  
   switch(wParam) @@K/0:],  
   {  Vdx o  
    case VK_MENU: '_4apyq|  
     MaskBits&=~ALTBIT; _,60pr3D'  
     break; xBc|rqge  
    case VK_CONTROL: -O?HfQ  
     MaskBits&=~CTRLBIT; n/(}|xYU  
     break; e,p*R?Y{[  
    case VK_SHIFT: =cS5f#0  
     MaskBits&=~SHIFTBIT; I50Ly sM  
     break; :{)uD ;  
    default: //judge the key and send message S-o )d  
     break; ejyx[CF  
   } 6>#8 ^{[  
   for(int index=0;index<MAX_KEY;index++){ *9r(lmrfj  
    if(hCallWnd[index]==NULL) X)hpbHa  
     continue; 1ow,'FztPt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DoFe:+_U3  
    { V6[jhdb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %La7);SeY  
     bProcessed=TRUE; 7glf?oE  
    } Xw'sh#i2  
   } 0nCiN;sA  
  } 2e1%L,y{W  
  else if((lParam&0xc000ffff)==1){ //有键按下 YYFS ({  
   switch(wParam) mMXDzAllB  
   { KzV|::S^  
    case VK_MENU: C^,b aCX  
     MaskBits|=ALTBIT; z(Uz<*h8  
     break; iOEBjj;C  
    case VK_CONTROL: :3R3 >o6m  
     MaskBits|=CTRLBIT; a@jM%VZ  
     break; OET/4( C  
    case VK_SHIFT: '@+q_v@Jl  
     MaskBits|=SHIFTBIT; Ew{*)r)m  
     break; d9S?dx  
    default: //judge the key and send message w=(dJ(7gu  
     break; BNjMq  
   } H.XyNtJ  
   for(int index=0;index<MAX_KEY;index++){ "}1cQ|0a  
    if(hCallWnd[index]==NULL) Uaux0W  
     continue; ]U'zy+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (n.IK/:  
    { iOhX\@&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ga\ s5  
     bProcessed=TRUE; \F`>zY2$%  
    } FIfLDT+Wh  
   } ~E8/m_> rU  
  } 3]9wfT%d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZG1TR F "  
   for(int index=0;index<MAX_KEY;index++){ PPV T2;9  
    if(hCallWnd[index]==NULL) zfI{cMn'J  
     continue; YI*H]V%w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  G$'UK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~a2|W|?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >6&Rytcc]  
   }  q9{ h@y  
  } V >eG\  
 } b|k^   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #W/Ch"Kv  
} <m~8pM  
<5j%!6zo  
  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: }jC^&%|  
E A55!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0[d*Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AU)\ lyB  
! jAp V  
  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: A#?Cts ,M  
0Cf'\2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /mp!%j~  
{ h {Jio>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $Lbamg->E  
 { jPz1W4pk  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >#&25,Q  
  SaveBmp(); N.Q}.(N0  
  return FALSE; seAPVzWUU  
 } NQuqM`LSQ  
 …… //其它处理及默认处理 `_1fa7,z  
} x%H,ta%  
x\ # K2  
p>J@"?%^  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。  9S9j  
YW~ 9N  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 R#y"SxD()  
x;:jF_  
  二、编程步骤 4Ng:7C2  
jHE^d<=O^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; z#`Qfvu6Hi  
tUOY`]0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l+&DBw[  
Zw{?^6;cS  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; GNuIcy  
j -"34  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +Tx_q1/f5X  
N8kNi4$mp=  
  5、 添加代码,编译运行程序。 V'dw=W17V  
m##!sF^k~J  
三、程序代码 9* 3;v;F  
-~JYfj@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c V MRSp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) HrZX~JnTmf  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :|ah u  
#if _MSC_VER > 1000 nIL67&  
#pragma once B:UM2Jl   
#endif // _MSC_VER > 1000 KlS#f  
#ifndef __AFXWIN_H__ GB}=  
#error include 'stdafx.h' before including this file for PCH :Sd`4"AA  
#endif sz/^Ie-~  
#include "resource.h" // main symbols W?wt$'  
class CHookApp : public CWinApp 8_Uh h5[  
{ :t "_I  
 public: 9(!AKKrr;  
  CHookApp(); hP.Km%C)0n  
  // Overrides -O1$jBQ S  
  // ClassWizard generated virtual function overrides ]n"RPktx  
  //{{AFX_VIRTUAL(CHookApp) "LkBN0D  
 public: Nr*X1lJ6  
  virtual BOOL InitInstance(); w?8\9\ ;?  
  virtual int ExitInstance(); A1Uy|Dl  
  //}}AFX_VIRTUAL ] `q]n  
  //{{AFX_MSG(CHookApp) kMLJa=]$  
  // NOTE - the ClassWizard will add and remove member functions here. tEo-Mj5:  
  // DO NOT EDIT what you see in these blocks of generated code ! NMhpKno  
  //}}AFX_MSG Pe\Obd8d  
  DECLARE_MESSAGE_MAP() 2T?Y  
}; T fIOS]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [Pjitw/?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c1a$J`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a-F I`Dv  
BOOL InitHotkey(); -nHkO&&R  
BOOL UnInit(); [YODyf}M>\  
#endif :O&jm.2m  
[iO8R-N8d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. eGpKoq7a  
#include "stdafx.h" [\h?mlG?  
#include "hook.h" PP!-*~F0Jr  
#include <windowsx.h> A X1!<K  
#ifdef _DEBUG ?fC9)s  
#define new DEBUG_NEW ?GhMGpd Mq  
#undef THIS_FILE #XqCz>Z  
static char THIS_FILE[] = __FILE__; UA~ 4O Q]  
#endif aMHC+R1X  
#define MAX_KEY 100 %-K5sIz  
#define CTRLBIT 0x04 3>MILEY^  
#define ALTBIT 0x02 =)g}$r &<  
#define SHIFTBIT 0x01 /|}yf/^9X  
#pragma data_seg("shareddata") !m-`~3P#l,  
HHOOK hHook =NULL; ,:'JJZg@  
UINT nHookCount =0; $-t@=N@vO?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey /hVwrt(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ae@!M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2T(+VeMQ=  
static int KeyCount =0; +Q);t,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ns\I Y<Yo  
#pragma data_seg() M?}:N_9<J  
HINSTANCE hins; Oi^cs=}  
void VerifyWindow(); ibwV #6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  |xg#Q`O  
//{{AFX_MSG_MAP(CHookApp) {5c?_U  
// NOTE - the ClassWizard will add and remove mapping macros here.  !=*8*?@  
// DO NOT EDIT what you see in these blocks of generated code! C$C>RYE?.  
//}}AFX_MSG_MAP + %K~  
END_MESSAGE_MAP() 7j=KiiI  
_&s pMf  
CHookApp::CHookApp() 8 qw{e`c  
{ &?1^/]'"r  
 // TODO: add construction code here, olxxs(  
 // Place all significant initialization in InitInstance ln8NcAEx  
} P*|=Z>%[0  
5=#d#dDc  
CHookApp theApp; srO>l ;Vf/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .o C! ~'  
{ ZS]Z0iZv9  
 BOOL bProcessed=FALSE; _$D!"z7i  
 if(HC_ACTION==nCode) ;]>)6  
 { ]W2#8:i  
  if((lParam&0xc0000000)==0xc0000000){// Key up z8{-I@+`  
   switch(wParam) @^ -Y&N!b=  
   { (/]#G8  
    case VK_MENU: CP%^)LX *  
     MaskBits&=~ALTBIT; 4~FRE)8  
     break; $>yfu=]?  
    case VK_CONTROL: % C2Vga#  
     MaskBits&=~CTRLBIT; NR k~  
     break; d-tg^Ot#  
    case VK_SHIFT: ,t wB" *  
     MaskBits&=~SHIFTBIT; L1(-xNUo_i  
     break; U{pg y#/  
    default: //judge the key and send message Qf ~$9?z  
     break; z;<~j=lP  
   } &Q}%b7  
   for(int index=0;index<MAX_KEY;index++){ PO6yE r  
    if(hCallWnd[index]==NULL) lfC]!=2%~8  
     continue; <?!'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n9J{f"`m  
    { 4`:POu&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wJq$yqos{  
     bProcessed=TRUE; Tt{z_gU6  
    } !|u?z%  
   } |?g-8":H8P  
  } "gm5 DE  
  else if((lParam&0xc000ffff)==1){ //Key down m9:ah<  
   switch(wParam) ;i?2^xe^~c  
   { /JC1o&z_T  
    case VK_MENU: ?vAhDD5  
     MaskBits|=ALTBIT; eQ8t.~5;-  
     break; ;sAGTq  
    case VK_CONTROL: wik<# ke  
     MaskBits|=CTRLBIT; C|3Xz[k{  
     break; ZxT E(BQv  
    case VK_SHIFT: BQg3+w:>  
     MaskBits|=SHIFTBIT; .7b%7dQ<\  
     break; `Z5dRLrd  
    default: //judge the key and send message mR XR uK  
     break; x`@`y7(  
   } Ny$3$5/  
   for(int index=0;index<MAX_KEY;index++) GQ@mQ=i  
   { .RFH@''  
    if(hCallWnd[index]==NULL) >8OY6wb  
     continue; 5.&)hmpg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y1PyH  
    { G'-#99wv.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =G^'wwpv(  
     bProcessed=TRUE; (g X8iKl  
    } WR"1d\m:  
   } 7[qL~BT+  
  } N5sVRL"7  
  if(!bProcessed){ GxG~J4  
   for(int index=0;index<MAX_KEY;index++){ L2EQ 9i'[  
    if(hCallWnd[index]==NULL) )&>W/56/  
     continue; YMK ![ q-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K@cWg C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~KkC089D  
   } #m?)XB^_  
  } 5toa@#Bc%  
 } 5BXku=M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); t;h`nH[  
} z5M6  
-40X3  
BOOL InitHotkey() _~\ } fY  
{ HNBmq>XDc  
 if(hHook!=NULL){ &b5(Su  
  nHookCount++; 0^o/c SF  
  return TRUE; jED.0,+K !  
 } u|Mx}  
 else +D]raU  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0D@$  
  if(hHook!=NULL) -/{FGbpR;  
   nHookCount++; {b4`\ I@<  
  return (hHook!=NULL); wDW%v@  
} ml1%C%  
BOOL UnInit() |M5#jVXj  
{ [yQ%g;m  
 if(nHookCount>1){ 9.M'FCd~M  
  nHookCount--; R3|4|JlGR  
  return TRUE; \#dacQ2E@  
 } N\|z{vn  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ] T]{VB  
 if(unhooked==TRUE){ ^&1O:G*"  
  nHookCount=0; |H_WY#  
  hHook=NULL; n^ fUKi*;  
 } b-  t  
 return unhooked; `}=R  
} Qm[s"pM  
hd9HM5{p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ztSQrDbbb4  
{ (M$>*O3SR  
 BOOL bAdded=FALSE; c6 mS  
 for(int index=0;index<MAX_KEY;index++){ -X$EE$:  
  if(hCallWnd[index]==0){ wxh\CBxG  
   hCallWnd[index]=hWnd; QtKcv7:4  
   HotKey[index]=cKey; x$BNFb%I1  
   HotKeyMask[index]=cMask; N2A6C$s  
   bAdded=TRUE; '0q$qN  
   KeyCount++; *qO) MpG{  
   break; 0,ryy,2  
  } =ejU(1 g  
 } Yr-SlO>  
 return bAdded; G|1.qHP[F  
} XxmWj-=qO  
4{zy)GE|W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |3,WiK='  
{ IV. })8  
 BOOL bRemoved=FALSE; #c@&mus  
 for(int index=0;index<MAX_KEY;index++){ \uPzj_kU6  
  if(hCallWnd[index]==hWnd){ # lvt4a"P"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >iOf3I-ATt  
    hCallWnd[index]=NULL; <nbk lo  
    HotKey[index]=0; 8ex;g^e  
    HotKeyMask[index]=0; NC-K`)  
    bRemoved=TRUE; _`\!+qGq  
    KeyCount--; YWH>tt 9  
    break; ;NRh0)%|o  
   } [C6ba{9 B  
  } n Ab~  
 } Ei@  
 return bRemoved; \/3(>g?4  
} 0x-g0]  
TxG@#" ^g}  
void VerifyWindow() e~lFjr]  
{ }BlyEcw'aN  
 for(int i=0;i<MAX_KEY;i++){ r4 *H96l  
  if(hCallWnd!=NULL){ `K.B`  
   if(!IsWindow(hCallWnd)){ (Fzy8 s  
    hCallWnd=NULL; 96V8R<   
    HotKey=0; aH_c84DS  
    HotKeyMask=0; lY tt|J  
    KeyCount--; ^{MqJ\S7H  
   } JnBc@qnP6  
  } )x/#sW%)  
 } Zc~7R`v7}  
} OU,FU@6,7w  
^w1+b;)  
BOOL CHookApp::InitInstance() (y>N\xS9  
{ d[3me{Rs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G:$kGzhJ  
 hins=AfxGetInstanceHandle(); 15j5F5P   
 InitHotkey(); "73y}'  
 return CWinApp::InitInstance(); 6Oy:5Ps8a  
} F:ycV~bE  
a4^hC[a  
int CHookApp::ExitInstance() T"Y#u  
{ iLSUz j`  
 VerifyWindow(); <7J3tn B  
 UnInit(); 2w7$"N  
 return CWinApp::ExitInstance(); 3O$l;|SX  
} ?;W"=I*3  
o[!o+M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NzQvciJ@"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wea  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ L!Y|`P#Yr  
#if _MSC_VER > 1000 U%:%. Bys  
#pragma once _r3Y$^!U  
#endif // _MSC_VER > 1000 9/0H,qZc  
*>=tmW;%  
class CCaptureDlg : public CDialog }}TPu8Rl  
{ /8qR7Z^HZ  
 // Construction vm+3!s:u  
 public: C<^i`[&P$  
  BOOL bTray; mnM]@8^G  
  BOOL bRegistered; )?[7}(4jI  
  BOOL RegisterHotkey(); !ZUUn*e{5  
  UCHAR cKey; |(%<FY$  
  UCHAR cMask; t^":.}[Q  
  void DeleteIcon(); D|ze0A@  
  void AddIcon(); o!UB x<4  
  UINT nCount; /(s |'"6  
  void SaveBmp(); U!|)M  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor lot`6]  
  // Dialog Data @ ,X/Wf  
  //{{AFX_DATA(CCaptureDlg) ZzE(S  
  enum { IDD = IDD_CAPTURE_DIALOG }; O6y:e #0z  
  CComboBox m_Key; j67a?0<C2U  
  BOOL m_bControl; [IOI&`?D  
  BOOL m_bAlt; y{mt *VA4  
  BOOL m_bShift; e x Z/  
  CString m_Path; GqCBD-@4v.  
  CString m_Number; tjtvO@?1-  
  //}}AFX_DATA d {U%q d  
  // ClassWizard generated virtual function overrides +&G(AW  
  //{{AFX_VIRTUAL(CCaptureDlg) |"LHo  H  
 public: fU$Jh/#":  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s 7 nl  
 protected: G]aey>)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~Re4zU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Fc`IRPW<  
  //}}AFX_VIRTUAL ++,I`x+p  
  // Implementation A` _dj}UF  
 protected: 6t;;Fz  
  HICON m_hIcon; q("XS  
  // Generated message map functions $5G(_   
  //{{AFX_MSG(CCaptureDlg) Iz+%wAZ|B6  
  virtual BOOL OnInitDialog(); O/#3QK  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9~~NxWY%x  
  afx_msg void OnPaint(); 1<m`38'  
  afx_msg HCURSOR OnQueryDragIcon(); dM^EYW  
  virtual void OnCancel(); Cty{   
  afx_msg void OnAbout(); *Ze0V9$'  
  afx_msg void OnBrowse(); )KFxtM-  
  afx_msg void OnChange(); t jThQ  
 //}}AFX_MSG V6dq8Z"h  
 DECLARE_MESSAGE_MAP() Fj<*!J$,  
}; l3b=8yn.  
#endif h!SsIy(  
u $-&Im<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B;[ .u>f  
#include "stdafx.h" ldTXW(^j  
#include "Capture.h" _0Ea 3K  
#include "CaptureDlg.h" O)&W0` VY  
#include <windowsx.h> AAa7)^R  
#pragma comment(lib,"hook.lib") ^)]U5+g?  
#ifdef _DEBUG F,S)P`?  
#define new DEBUG_NEW u=nd7:bv  
#undef THIS_FILE K.QSt  
static char THIS_FILE[] = __FILE__; zl8M<z1`1  
#endif i=<;$+tW  
#define IDM_SHELL WM_USER+1 cu>(;=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }6a}8EyFP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9cB+ x`+Lu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P.Bwfa  
class CAboutDlg : public CDialog | I:@:  
{ !%65YTxY-  
 public: \12G,tBH  
  CAboutDlg(); xDw~n(*  
  // Dialog Data m BvO<?ec  
  //{{AFX_DATA(CAboutDlg) /Yi4j,8!|  
  enum { IDD = IDD_ABOUTBOX }; EoJ\Jk  
  //}}AFX_DATA RP{0+  
  // ClassWizard generated virtual function overrides )lLeL#]FLO  
  //{{AFX_VIRTUAL(CAboutDlg) 7Q|<6210  
 protected: :8O T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8:c=h/fa  
  //}}AFX_VIRTUAL v zs4tkG  
  // Implementation ]CLM'$  
 protected: DQK?y=vf  
  //{{AFX_MSG(CAboutDlg) [(Z(8{3i  
  //}}AFX_MSG ^=^\=9" b  
  DECLARE_MESSAGE_MAP() KJyCfMH&:@  
}; A{\?]]/  
X>`03?L  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C)j/!+nh  
{ "[7-1}l  
 //{{AFX_DATA_INIT(CAboutDlg) 99*k&mb  
 //}}AFX_DATA_INIT ( gg )?  
} ,*W~M&n"m  
E`_T_O=P  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B /uaRi%  
{ %C`P7&8m=O  
 CDialog::DoDataExchange(pDX); N4,oO H~  
 //{{AFX_DATA_MAP(CAboutDlg) F<{,W-my `  
 //}}AFX_DATA_MAP Az y`4  
} .g}N@  
BNJ0D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z:^#9D{  
 //{{AFX_MSG_MAP(CAboutDlg) M>5OC)E  
 // No message handlers 'i$. _Tx  
 //}}AFX_MSG_MAP gk| % 4.  
END_MESSAGE_MAP() !`N:.+DT  
pnSKIn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ZMlBd}H  
: CDialog(CCaptureDlg::IDD, pParent) OR6vA5J  
{ :z P:4 NW  
 //{{AFX_DATA_INIT(CCaptureDlg) ^BLO}9A{P  
  m_bControl = FALSE; 1_S]t[?I/  
  m_bAlt = FALSE; nZnqXclzxn  
  m_bShift = FALSE; TO89;O  
  m_Path = _T("c:\\"); \{ | GK  
  m_Number = _T("0 picture captured."); 0<v5_ pB  
  nCount=0; eb`3'&zV&)  
  bRegistered=FALSE; &c!6e<o[p  
  bTray=FALSE; vC>2%Zgf-  
 //}}AFX_DATA_INIT W7 A!QS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ox#vW6;)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); G7Ck P  
} !0hyp |F:>  
Gn4b*Y&M]3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }=v4(M`%  
{ ~vt*%GN3  
 CDialog::DoDataExchange(pDX); n.c0G`  
 //{{AFX_DATA_MAP(CCaptureDlg) eik_w(xPT  
  DDX_Control(pDX, IDC_KEY, m_Key); tn Ufi8\ob  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); wbF`wi?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); er24}G8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); gmH`XKi\  
  DDX_Text(pDX, IDC_PATH, m_Path); |Q)mBvvN  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *#>(P  
 //}}AFX_DATA_MAP xltN-<n7  
} ^_3Ey  
v`QDms,{  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?XdvZf $  
//{{AFX_MSG_MAP(CCaptureDlg) b#N P*L&  
 ON_WM_SYSCOMMAND() vdn)+fZ;   
 ON_WM_PAINT() hd'fWFW N  
 ON_WM_QUERYDRAGICON() *~ IHVU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a]fFR~ OY  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZKrK >X  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \?t8[N\_[(  
//}}AFX_MSG_MAP @` Pn<_L  
END_MESSAGE_MAP() 8hS^8  
J \|~k2~  
BOOL CCaptureDlg::OnInitDialog() :Ef!gpS}?R  
{ zqt<[=O  
 CDialog::OnInitDialog(); sE&nEc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #2i$:c~  
 ASSERT(IDM_ABOUTBOX < 0xF000); lz>00B<Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Bj4c_YBte  
 if (pSysMenu != NULL) vkJyD/;=  
 { `:7r5}(^  
  CString strAboutMenu; |sr\SCx  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Xh}q/H<  
  if (!strAboutMenu.IsEmpty()) USEmD5q  
  { {M:/HQo  
   pSysMenu->AppendMenu(MF_SEPARATOR); <%3fJt-Ie  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); VtzZ1/J E  
  } &TRKd)wd  
 } pD[&,gV$  
 SetIcon(m_hIcon, TRUE); // Set big icon ~SBW`=aP}  
 SetIcon(m_hIcon, FALSE); // Set small icon 9;XbyA]  
 m_Key.SetCurSel(0); MVzj7~+  
 RegisterHotkey(); p_BG#dRM  
 CMenu* pMenu=GetSystemMenu(FALSE); ^PFiO 12  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V C VqUCc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); R5QW4i9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2|\mBP`ok  
 return TRUE; // return TRUE unless you set the focus to a control )|v  du  
} G3|23G.~)(  
En7+fQ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0^Ldw)C"  
{ **__&X p1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bj0HAgY@  
 { 32+N?[9 *  
  CAboutDlg dlgAbout; :T$}@& -  
  dlgAbout.DoModal(); \mu';[gLd  
 } vM5I2C3_>!  
 else p&Nav,9x  
 { +&"W:Le:  
  CDialog::OnSysCommand(nID, lParam); &u|t{C#0  
 } = .S2gO >  
} 2u_=i$xW  
gYbvCs8O!  
void CCaptureDlg::OnPaint() _5n2'\] H`  
{ FEhBhv|m  
 if (IsIconic()) rMWvW(@@D  
 { o/,%rA4  
  CPaintDC dc(this); // device context for painting GB `n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); } -4p8Zt  
  // Center icon in client rectangle =aj|auu  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0e"KdsA:<U  
  int cyIcon = GetSystemMetrics(SM_CYICON); "Vc|D (g  
  CRect rect; bZWR. </  
  GetClientRect(&rect); YdvXp/P:|  
  int x = (rect.Width() - cxIcon + 1) / 2; X)]>E]X  
  int y = (rect.Height() - cyIcon + 1) / 2; !V#*(_+n  
  // Draw the icon p=[dt  
  dc.DrawIcon(x, y, m_hIcon); 7Y~5gn  
 } u* iqwm.  
 else b*| ?7  
 { |1ry*~  
  CDialog::OnPaint(); (*eX'^Q)d  
 } rA<J^dX=C  
} :FSg%IUX  
ZHA&gdK@  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3<FqK\P  
{ vr47PM2al  
 return (HCURSOR) m_hIcon; (.oDxs()I  
} FLPN#1  
Th,]nVsGs~  
void CCaptureDlg::OnCancel() E.$//P n|1  
{ @:hWahMy  
 if(bTray) W{ozZuo  
  DeleteIcon(); AS0(NlV  
  CDialog::OnCancel(); _kOuD}_|  
} i-0AcN./p  
T06w`'aL  
void CCaptureDlg::OnAbout() <5]_u:  
{ 4mBM5Tv  
 CAboutDlg dlg; .O~rAu*K  
 dlg.DoModal(); b,HXD~=  
} 0=`aXb-  
z}5'TV=^  
void CCaptureDlg::OnBrowse() 0_y&9Te  
{ PK?}hz  
 CString str; D0f7I:i1  
 BROWSEINFO bi; S#+ _HFUK{  
 char name[MAX_PATH]; .*EP$pc  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); (#je0ES  
 bi.hwndOwner=GetSafeHwnd(); Dh{P23}  
 bi.pszDisplayName=name; 5.0;xz}#y  
 bi.lpszTitle="Select folder"; g+.E=Ef8<4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; aM[fag$c  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); cEJ_z(\=hr  
 if(idl==NULL) F r2 +p  
  return; ,h3,& ,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  ;XYfw)  
 str.ReleaseBuffer(); 3kJSz-_M  
 m_Path=str; \<%FZT_4~  
 if(str.GetAt(str.GetLength()-1)!='\\') &@7|_60  
  m_Path+="\\"; OZ Obx  
 UpdateData(FALSE); < R@&<E6  
} 1 d.>?^uE  
wL0"1Ya  
void CCaptureDlg::SaveBmp() kgmb<4p  
{ jS/$ o?  
 CDC dc; -IV-"-6(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); H~hAm  
 CBitmap bm; ^eYJ7&t  
 int Width=GetSystemMetrics(SM_CXSCREEN); C$c.(5/O  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5o(=?dXm4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); p|*b] 36  
 CDC tdc; @qJv  
 tdc.CreateCompatibleDC(&dc); d<;XQ.Wo7  
 CBitmap*pOld=tdc.SelectObject(&bm); ~>$(5 s2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 10/3-)+  
 tdc.SelectObject(pOld); !q PUQ+  
 BITMAP btm; J _|>rfW  
 bm.GetBitmap(&btm); wVs|mG"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  -gS/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]}0+7Q  
 BITMAPINFOHEADER bih; / dn]`Ge)  
 bih.biBitCount=btm.bmBitsPixel; p@znmn-  
 bih.biClrImportant=0; ^h|'\-d\  
 bih.biClrUsed=0; n_] OYG>U  
 bih.biCompression=0; |om3*]7  
 bih.biHeight=btm.bmHeight; ~Uz|sQ*G  
 bih.biPlanes=1; :TWHmxch  
 bih.biSize=sizeof(BITMAPINFOHEADER); }S&SL)  
 bih.biSizeImage=size; L/cbq*L  
 bih.biWidth=btm.bmWidth; %^ E>~  
 bih.biXPelsPerMeter=0; `[1]wV5(5@  
 bih.biYPelsPerMeter=0; [ 06B)|s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r?2C%GI`  
 static int filecount=0; sAc)X!}  
 CString name; 8c$IsvJg  
 name.Format("pict%04d.bmp",filecount++); /L[:C=u  
 name=m_Path+name; }`^<ZNkb/  
 BITMAPFILEHEADER bfh; 4]8PF  
 bfh.bfReserved1=bfh.bfReserved2=0; z#*GPA8Em:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); kQBVx8Uq]  
 bfh.bfSize=54+size; <~8W>Y\m  
 bfh.bfOffBits=54; tv|=`~Y  
 CFile bf; )ZmE"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +V\NMW4d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )'<zC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bm7$DKp#  
  bf.WriteHuge(lpData,size); r*3XM{bZ/@  
  bf.Close(); 'XQv>J  
  nCount++; A><%"9pZ  
 } +Q_Gm3^  
 GlobalFreePtr(lpData); pV-.r-P  
 if(nCount==1) Ri-wbYFaP  
  m_Number.Format("%d picture captured.",nCount); $S cjEG:6  
 else d ly 08 74  
  m_Number.Format("%d pictures captured.",nCount); &k{@:z  
  UpdateData(FALSE); AU$5"kBE  
} %I=J8$B]f  
Y2D) $  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -s!PO;qm  
{ $fvUb_n  
 if(pMsg -> message == WM_KEYDOWN) cE]kI,Fw,M  
 { FRF}V@~  
  if(pMsg -> wParam == VK_ESCAPE) "Ii!)n,  
   return TRUE; F;NZJEy  
  if(pMsg -> wParam == VK_RETURN) *AN#D?X_  
   return TRUE; |m EJJg`"7  
 } XAFTLNV>  
 return CDialog::PreTranslateMessage(pMsg); g%[Ruugu  
} IH0^*f  
BR%:`uiQ<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (c_hX(  
{ ^ pR&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a:]yFi:Su  
  SaveBmp(); Zj<T#4?8  
  return FALSE; Q\z*q,^R  
} |Z/ySAFM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &boBu^,94  
 CMenu pop; q.X-2jjpx:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (6+0U1[Iz  
 CMenu*pMenu=pop.GetSubMenu(0); Qqaf\$X  
 pMenu->SetDefaultItem(ID_EXITICON); QtzHr  
 CPoint pt; QBo^{],  
 GetCursorPos(&pt); ~5#7i_%@E}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gddGl=rm  
 if(id==ID_EXITICON) y@z #Jw<  
  DeleteIcon(); +]_} \  
 else if(id==ID_EXIT) gy[uq m_ T  
  OnCancel(); \ a<Ye T  
 return FALSE; ?d%}K76V<  
} ixkg,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0nd<6S+fs  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MLb\:Ihy  
 AddIcon(); G j:|  
 return res; u@3w$"Pv1  
} ZtT`_G&  
pL-$Np] V  
void CCaptureDlg::AddIcon() ={oO9.9  
{ X[[=YCi0  
 NOTIFYICONDATA data; m1hf[cg  
 data.cbSize=sizeof(NOTIFYICONDATA); *\>2DUu\`  
 CString tip; :4Vt  
 tip.LoadString(IDS_ICONTIP); g<-cHF  
 data.hIcon=GetIcon(0); }A;Xd/,'r  
 data.hWnd=GetSafeHwnd(); 33 4*nQ  
 strcpy(data.szTip,tip); wDG4rN9x  
 data.uCallbackMessage=IDM_SHELL; KKzvoc?Bt  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'huLv(Uu  
 data.uID=98; RPWYm  
 Shell_NotifyIcon(NIM_ADD,&data); ro{MD s  
 ShowWindow(SW_HIDE);  x1et,&,  
 bTray=TRUE; v]!7=>/2  
} J5"*OH:f  
*$1)&2i  
void CCaptureDlg::DeleteIcon() 5%$#3LT|  
{ 3WY W])  
 NOTIFYICONDATA data; m}E$6E^~O  
 data.cbSize=sizeof(NOTIFYICONDATA); koU.`l.  
 data.hWnd=GetSafeHwnd(); td~3N,S  
 data.uID=98; #]'xUgcE9  
 Shell_NotifyIcon(NIM_DELETE,&data); ^pP 14y*go  
 ShowWindow(SW_SHOW); gs3}rW  
 SetForegroundWindow(); A.FI] K@  
 ShowWindow(SW_SHOWNORMAL); o5R\7}]GE  
 bTray=FALSE; 6M9rC[h\  
} H6eGLg={  
#Grm-W9E  
void CCaptureDlg::OnChange()  ]gW J,  
{ S7vE[VF5  
 RegisterHotkey(); one>vi`=  
} GwULtRa/  
-iHhpD9"X  
BOOL CCaptureDlg::RegisterHotkey() T_-MSXhA  
{ KPhqD5, (  
 UpdateData(); *GhRU5  
 UCHAR mask=0; BTyVfq sx  
 UCHAR key=0; `<n:D`{dZ  
 if(m_bControl) `dZ|}4[1  
  mask|=4; %r"GL  
 if(m_bAlt) 9vu8koL  
  mask|=2; '3Ie0QO]"%  
 if(m_bShift) s$_#T  
  mask|=1; K36B9<F  
  key=Key_Table[m_Key.GetCurSel()]; g]#Wve  
 if(bRegistered){ luT8>9X^:a  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 86g+c  
  bRegistered=FALSE; c"ztrKQQ  
 } 'Ap 5Aq  
 cMask=mask; \YS?}! 0  
 cKey=key; nz\fN?q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rWXW}Yg  
 return bRegistered; |9I;`{@  
} O)R0,OPb  
B .mV\W  
  四、小结 M}Mzm2d#`  
4;||g@f'[  
  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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