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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: 'J*<iA*W  
  M/D)".;  
  一、实现方法 pZZgIw}aS  
&MR/6"/s  
  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: "o!{51!'  
D;GD<zC]  
#pragma data_seg("shareddata") xieP "6  
HHOOK hHook =NULL; //钩子句柄 OkAK  
UINT nHookCount =0; //挂接的程序数目 %ugHhS!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 MJ<Jb,D1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =6FUNvP#8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey z><5R|Gf  
static int KeyCount =0; o{v&.z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (%CZ*L[9Z  
#pragma data_seg() Ph&urxH@  
F1;lQA*7K.  
  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。 3T\l]? z  
`"yxdlXA  
  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: {C`GW}s{4  
:WGtR\tK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR LL^q1)o  
cKey,UCHAR cMask) P=N$qz$U  
{ $FH18  
 BOOL bAdded=FALSE; K)7zKEp`cj  
 for(int index=0;index<MAX_KEY;index++){ MOn,Db$  
  if(hCallWnd[index]==0){ -${DW^txMZ  
   hCallWnd[index]=hWnd; +@9gkPQQ-@  
   HotKey[index]=cKey; 1L7{p>;-dO  
   HotKeyMask[index]=cMask; C<^YVeG  
   bAdded=TRUE; J;t 7&Zpe  
   KeyCount++; }F6<w{|  
   break; )/ Ud^wi  
  } r r`;W}3  
 } =*BIB5  
 return bAdded; { kSf{>Ia  
} Mpue   
//删除热键 Mvj;ic6iK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H?1xjY9sl  
{ MmPU7Nl%X  
 BOOL bRemoved=FALSE; seFGJfN\?f  
 for(int index=0;index<MAX_KEY;index++){ =-cwXo{Q.O  
  if(hCallWnd[index]==hWnd){ zo{/'BnU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vg Ipj3u  
    hCallWnd[index]=NULL; %z]U LEYrZ  
    HotKey[index]=0; +1JH  
    HotKeyMask[index]=0; FQ%c~N  
    bRemoved=TRUE; u*S=[dq  
    KeyCount--; qIUfPA=/_  
    break; [,EpN{l  
   } 6\7nc FO3  
  } gieN9S  
 } x}/,yaWZ  
 return bRemoved; uhH^>z KA  
} Jo(`zuLJ  
mM.*b@d-  
>DM44  
  DLL中的钩子函数如下: V~DMtB7  
:nHKl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /StTb,  
{ 5FVndMM#y  
 BOOL bProcessed=FALSE; p=GWq(S6  
 if(HC_ACTION==nCode) TQX)?^Ft  
 { ]  H~4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 b2(RpY2Y  
   switch(wParam) .9*wY0:  
   {  wZT%Ee\D%  
    case VK_MENU: ]G.%Ty  
     MaskBits&=~ALTBIT; ',3HlOJ:  
     break; ( GnuWc\p  
    case VK_CONTROL: [97:4.  
     MaskBits&=~CTRLBIT; +[@z(N-h  
     break; j| Wv7  
    case VK_SHIFT: ?PA$Ur21lw  
     MaskBits&=~SHIFTBIT; A , CW_  
     break; f|A riM  
    default: //judge the key and send message ,)+ o  
     break; Jk|Q`h  
   } A61^[Y,dX_  
   for(int index=0;index<MAX_KEY;index++){ N qHy%'R  
    if(hCallWnd[index]==NULL) {_N,=DQ!  
     continue; %V &n*3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T#%/s?_>.  
    { ( m\$hX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v$~QCtc  
     bProcessed=TRUE; L$'[5"ma ;  
    } #&<)! YY5  
   } \]Kh[z0"  
  } [P zv4+  
  else if((lParam&0xc000ffff)==1){ //有键按下 }<@j'Ok}.  
   switch(wParam) uJx"W  
   { =@Dwlze  
    case VK_MENU: I4;A8I  
     MaskBits|=ALTBIT; *D4hq=  
     break; B!{d-gb  
    case VK_CONTROL: (Q[fS:U  
     MaskBits|=CTRLBIT; WH ?}~u9  
     break; `.x$7!zLC  
    case VK_SHIFT: h'J|K^na  
     MaskBits|=SHIFTBIT; !f>d_RG  
     break; rrg96WD  
    default: //judge the key and send message  $p!yhn7  
     break; }7fZ[J3  
   } ^ PI5L  
   for(int index=0;index<MAX_KEY;index++){ ~vLW.:  
    if(hCallWnd[index]==NULL) gM>t0)mGK  
     continue; { pu85'DV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ERwHLA  
    { 7e7 M@8+4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =/<LSeLxH  
     bProcessed=TRUE; T@}|zDC#  
    } 4%WzIzRb  
   } _(J&aY\  
  } ZZ QG?("S'  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 YDC mI@  
   for(int index=0;index<MAX_KEY;index++){ hLJM%on  
    if(hCallWnd[index]==NULL) |r ue=QZ  
     continue; {NpM.;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) AE: Z+rM*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6s,uXn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^@P1 JNe  
   } x@mL $  
  } f)]%.>  
 } GdB.4s^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _'4A|-9  
} f>'Y(dJ'W  
T5urZq*R  
  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: +% /s*EC'w  
0CSv10Tg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :^UFiUzrE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'c\iK=fl  
B1]bRxwn?  
  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:  zYXV;  
vVGDDDz/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _%'},Xd.z  
{ Cs2;z:O]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?!qY,9lhH  
 { Uax+dl   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 fEB7j-t  
  SaveBmp(); ~['Kgh_;  
  return FALSE; /iG*)6*^k  
 } Pxn,Qw*  
 …… //其它处理及默认处理 1[_mEtM:]B  
} w\) |  
Qf@I)4'  
u3Gjg{-N7  
  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。  $R<Me  
+cb6??H  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .q+0pj  
.ROznCe}  
  二、编程步骤 v}WR+)uFQ  
S9HwIH\m  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; }68i[v9Njk  
a^,(v  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; w[P4&?2:  
,C3,TkA]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; }kg ye2[  
u!1{Vt87  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 4k./(f2+  
RN=` -*E1  
  5、 添加代码,编译运行程序。 U%0Ty|$Y   
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三、程序代码 UH7jP#W%=  
Z{?G.L*/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL y qtKy  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Jk,;JQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (8_\^jJ  
#if _MSC_VER > 1000 h6dPO"  
#pragma once ETs>`#`6o  
#endif // _MSC_VER > 1000 r$)w7Gk<  
#ifndef __AFXWIN_H__ ">?vir^  
#error include 'stdafx.h' before including this file for PCH % `Z! 4L  
#endif NnVnUgx  
#include "resource.h" // main symbols ~  T>U  
class CHookApp : public CWinApp phO;c;y}  
{ `y+tf?QN  
 public: hy|b6wF&  
  CHookApp(); Z`YJBcXR  
  // Overrides }i!J/tJ)b  
  // ClassWizard generated virtual function overrides 0p89: I*0  
  //{{AFX_VIRTUAL(CHookApp) UA|u U5Q  
 public: 1}~(Yj@f%  
  virtual BOOL InitInstance(); A 7[:5$  
  virtual int ExitInstance(); 2wF8 P)  
  //}}AFX_VIRTUAL vv26I  
  //{{AFX_MSG(CHookApp) "Ks,kSEzu  
  // NOTE - the ClassWizard will add and remove member functions here. +S Jd@y@fR  
  // DO NOT EDIT what you see in these blocks of generated code ! a&vY!vx 3  
  //}}AFX_MSG Ar~"R4!  
  DECLARE_MESSAGE_MAP() ;;&}5jcV  
}; $AHQmyg<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); A_KW(;50  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RejQ5'Neh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 37}D9:#5C  
BOOL InitHotkey(); Y3Q9=u*5  
BOOL UnInit(); iYC9eEF  
#endif qx%}knB  
$\9~)Rq6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. irjP>3_e  
#include "stdafx.h" 5h;+Ky!I  
#include "hook.h" 7g3 >jh  
#include <windowsx.h> m8.U &0  
#ifdef _DEBUG F:aILx  
#define new DEBUG_NEW ?,/U^rf^4  
#undef THIS_FILE |fo0  
static char THIS_FILE[] = __FILE__; Jec'`,Y  
#endif "jw<V,,  
#define MAX_KEY 100 n0is\ZK 0  
#define CTRLBIT 0x04 c*~]zR>s!  
#define ALTBIT 0x02 {5  sO  
#define SHIFTBIT 0x01 uG<}N=  
#pragma data_seg("shareddata") \QB;Ja _  
HHOOK hHook =NULL; mx=BD'  
UINT nHookCount =0; tor!Dl@Mo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey PdvqDa8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `jOX6_z?I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {26ONa#i  
static int KeyCount =0; VH:]@x//{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A%^ILyU6c  
#pragma data_seg() Nv"EV;$  
HINSTANCE hins; 5scEc,JCi  
void VerifyWindow(); 0Zg%+)iy@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +sJrllrE(  
//{{AFX_MSG_MAP(CHookApp) SCTA=l.  
// NOTE - the ClassWizard will add and remove mapping macros here. 2@ Z(P.Gh  
// DO NOT EDIT what you see in these blocks of generated code! 7hcNf,  
//}}AFX_MSG_MAP gmm.{%1_I;  
END_MESSAGE_MAP() iJ~Vl"|m  
Ot`VR&}  
CHookApp::CHookApp() FLY Ca  
{ c ;'[W60  
 // TODO: add construction code here, b Ax?&$  
 // Place all significant initialization in InitInstance `[n(" 7,  
} I&YSQK:b  
dc rSz4E|>  
CHookApp theApp; ~^cMys |'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $r3i2N-I  
{ uDZT_c'Y  
 BOOL bProcessed=FALSE; ]EpWSs!"g  
 if(HC_ACTION==nCode) ivz{L-  
 { &/Q0  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ggb5K8D*  
   switch(wParam) {.?/)  
   { H8On<C=  
    case VK_MENU: J.| +ID+  
     MaskBits&=~ALTBIT; T|TO}_x  
     break; Xp}Yw"7  
    case VK_CONTROL: ~T89_L  
     MaskBits&=~CTRLBIT; U,.![TP  
     break; "T- `$'9  
    case VK_SHIFT: nxl[d\ap+n  
     MaskBits&=~SHIFTBIT; y? co|  
     break; 'Un " rts  
    default: //judge the key and send message x>Jr_A(  
     break; y?q*WUh  
   } Vkc#7W(  
   for(int index=0;index<MAX_KEY;index++){ Kc^;vT>3  
    if(hCallWnd[index]==NULL) ih;]nJ]+-  
     continue; "^]cQ"A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _zwUE  
    { ` 5C~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qC?:*CXH  
     bProcessed=TRUE; E\4 +_L_j  
    } c?,i3s+2Y  
   } dB5b@9*  
  } >lIk9|  
  else if((lParam&0xc000ffff)==1){ //Key down G@Z?&"    
   switch(wParam) d:U9pC$  
   { JC3m.)/  
    case VK_MENU: .8G@%p{,  
     MaskBits|=ALTBIT; :B:"NyPA  
     break; =Fr(9 (  
    case VK_CONTROL: sK5r$Dbr  
     MaskBits|=CTRLBIT; r|qp3x  
     break; 81i655!Z  
    case VK_SHIFT: 4sT88lG4n  
     MaskBits|=SHIFTBIT; u9EgdpD  
     break; hBX!iukT|{  
    default: //judge the key and send message "UJ S5[7$  
     break; ZXuv CI  
   } CLJ;<  
   for(int index=0;index<MAX_KEY;index++) W!>.$4Q9  
   { uPl\I6k  
    if(hCallWnd[index]==NULL) 2mGaD\?K  
     continue; vCw e'q`1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8 {X"h#  
    { 5w@4:$=I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]@Uq=?%  
     bProcessed=TRUE; Rw:*'1  
    } ptZ <ow&  
   } uD @#  
  } hK,Sf ;5V  
  if(!bProcessed){ rMhB9zB1  
   for(int index=0;index<MAX_KEY;index++){ 7G>dTO  
    if(hCallWnd[index]==NULL) cbT7CG  
     continue; Ot6aRk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) De(Hw& IV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x}"uZ$g  
   } c:o]d)S  
  } L$E{ycn  
 } /VN f{p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -- c"0,7  
} io{@^1ab  
cLsV`@J(k  
BOOL InitHotkey() |~vI3]}fx  
{ @3C>BLI8+  
 if(hHook!=NULL){ S9~ +c  
  nHookCount++; ap+JQ@b  
  return TRUE; ([m mPyp>L  
 } N%*5T[.  
 else V^Q#:@0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O#S;q5L@  
  if(hHook!=NULL) Yd=>K HVD  
   nHookCount++; f>UXD  
  return (hHook!=NULL); 42(Lb'G  
} )E-inHD /  
BOOL UnInit() <#u=[_H  
{ w.YiO5|y  
 if(nHookCount>1){ K|hjEQRv  
  nHookCount--; 6MT1$7|P&x  
  return TRUE; J:V6  
 } noml8o  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %R}.#,Suo  
 if(unhooked==TRUE){ 5?3Me59  
  nHookCount=0; eOs)_?}  
  hHook=NULL; Y6zbo  
 } W"}M1o  
 return unhooked; jw^<IMAG\8  
} ~&7MkkftM  
%}Ss,XJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [d1mL JAR  
{ g" .are'7  
 BOOL bAdded=FALSE; y}My.c  
 for(int index=0;index<MAX_KEY;index++){ [f1 (`<  
  if(hCallWnd[index]==0){  ]%wVHC  
   hCallWnd[index]=hWnd; FrL]^59a  
   HotKey[index]=cKey; T>2[=J8U  
   HotKeyMask[index]=cMask; MbZJ;,e?  
   bAdded=TRUE; )ttUWy$w  
   KeyCount++; +'I+o5*  
   break; <b`E_  
  } hRrn$BdLX  
 } p~BRh  
 return bAdded; w35J.zn  
} D(AXk8Vub  
QgU8 s'e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @` 1Ds  
{ $RIecv<e_  
 BOOL bRemoved=FALSE; CF&6J$ZBgJ  
 for(int index=0;index<MAX_KEY;index++){ W&& ;:Fr  
  if(hCallWnd[index]==hWnd){ |"/8XA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r&R B9S@*h  
    hCallWnd[index]=NULL; a!< 8\vzg  
    HotKey[index]=0; 1 u| wMO  
    HotKeyMask[index]=0; aWWU4xe  
    bRemoved=TRUE; g*e   
    KeyCount--; aB{vFTD5  
    break; %l}D.ml  
   } im9G,e  
  } -0$55pa/@:  
 } ]b7zJUz  
 return bRemoved; Bm.:^:&k  
} G7qG$wd8h  
Y^8C)p9r  
void VerifyWindow() KxYwJ  
{ wKZ$iGMbz  
 for(int i=0;i<MAX_KEY;i++){ Z~oo;xE  
  if(hCallWnd!=NULL){ 4e~A1-  
   if(!IsWindow(hCallWnd)){ !}v=N";c  
    hCallWnd=NULL; FbaEB RM  
    HotKey=0; n>+mL"hs  
    HotKeyMask=0; Zhh2v>QOy  
    KeyCount--; .S(TxksCz  
   } !;i`PPRwk  
  } iYORu 3  
 } M)'HCnvs'  
} QDs^Ije  
J&[@}$N  
BOOL CHookApp::InitInstance() S1p;nK  
{  x }\64  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xy5lE+E_U  
 hins=AfxGetInstanceHandle(); |Y$uqRdV  
 InitHotkey(); \m7-rV6r  
 return CWinApp::InitInstance(); D7lK30  
} R:e<W/P"  
p7veQ`yNc  
int CHookApp::ExitInstance() (]0%}$Fo  
{ (i34sqV$m  
 VerifyWindow(); rai3<_W<  
 UnInit(); )PG6gZYW  
 return CWinApp::ExitInstance(); N^HUijw<  
} &Q;sSIc  
9xO#tu]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file YP.5fq:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S4^vpY DeN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l>Z5 uSG  
#if _MSC_VER > 1000 T*#/^%HSG  
#pragma once 'MEz|Z  
#endif // _MSC_VER > 1000 ?]Pmxp H}  
Av xfI"sp  
class CCaptureDlg : public CDialog `tHvD=`m.  
{ ;i Fz?d3;  
 // Construction jT8#C=a7  
 public: biSz?DJ>  
  BOOL bTray; ]Y2RqXA*  
  BOOL bRegistered; *of3:w  
  BOOL RegisterHotkey(); *+j* {>E  
  UCHAR cKey; 8Eakif0CO  
  UCHAR cMask; ue4Vcf  
  void DeleteIcon(); Qr^|:U!;[z  
  void AddIcon(); \@8+U;d  
  UINT nCount; zA$k0p  
  void SaveBmp(); _AQb6Nb  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c0%"&a1]]V  
  // Dialog Data y.WEj?EL  
  //{{AFX_DATA(CCaptureDlg) txiP!+3OWB  
  enum { IDD = IDD_CAPTURE_DIALOG }; Sx?ua<`:d  
  CComboBox m_Key; ~-EOjX(X'E  
  BOOL m_bControl; -u2P ?~  
  BOOL m_bAlt; AWP"b?^G|  
  BOOL m_bShift; .q9 $\wM/  
  CString m_Path; pPcTrN'  
  CString m_Number; 1+9W+$=h2  
  //}}AFX_DATA Tav*+  
  // ClassWizard generated virtual function overrides ?Lyxw]  
  //{{AFX_VIRTUAL(CCaptureDlg) *^f<W6xc  
 public: -7S g62THS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !P)O(i=  
 protected: =&,]Z6{ >  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (vb SM}P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MC<PM6w  
  //}}AFX_VIRTUAL .v$D13L(o  
  // Implementation kO|L bQ@=q  
 protected: >N]7IU[-  
  HICON m_hIcon; b]x4o#t  
  // Generated message map functions ^ q<v{_  
  //{{AFX_MSG(CCaptureDlg) 73xAG1D$r  
  virtual BOOL OnInitDialog(); "tB;^jhRs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4WJ.^(  
  afx_msg void OnPaint(); S4G^z}{_  
  afx_msg HCURSOR OnQueryDragIcon(); +xrr? g  
  virtual void OnCancel(); .Yf:[`Q6g  
  afx_msg void OnAbout(); t0IEaj75c  
  afx_msg void OnBrowse(); ~y/ nlb!  
  afx_msg void OnChange(); @>p<3_Y1  
 //}}AFX_MSG nPye,"A Ol  
 DECLARE_MESSAGE_MAP() k&,~qoU  
}; <Dwar>}  
#endif K?BOvDW"`  
 *T5!{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file UazP6^{L  
#include "stdafx.h" Zg'Q>.:  
#include "Capture.h" 3?1`D/  
#include "CaptureDlg.h" V+VkY3  
#include <windowsx.h> 6f\Lf?vF  
#pragma comment(lib,"hook.lib") %O!v"Xh  
#ifdef _DEBUG q U]gj@R  
#define new DEBUG_NEW ZuS0DPS`L  
#undef THIS_FILE UE$UR#T'w  
static char THIS_FILE[] = __FILE__; %k'!Iq+  
#endif S/4^ d &Gr  
#define IDM_SHELL WM_USER+1 Jo@|"cE=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U$_xUG  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uf&myV7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Tl2C^j  
class CAboutDlg : public CDialog X pBj%e:  
{ wid;8%m  
 public: L#+q]j+  
  CAboutDlg(); 2vAQ  
  // Dialog Data _nbBIaHN{  
  //{{AFX_DATA(CAboutDlg) 9J9)AV  
  enum { IDD = IDD_ABOUTBOX }; L5 veX}  
  //}}AFX_DATA aC%m-m  
  // ClassWizard generated virtual function overrides 8]M_z:F7F  
  //{{AFX_VIRTUAL(CAboutDlg) j( RWO  
 protected: dIRm q+d^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mR}6r2O2\Q  
  //}}AFX_VIRTUAL E#u l IgD  
  // Implementation n&-qaoNl  
 protected: ENGg ~D  
  //{{AFX_MSG(CAboutDlg) 2@%$;.  
  //}}AFX_MSG =gJb^ Gx(w  
  DECLARE_MESSAGE_MAP() ReM=eS  
}; PzA|t;*  
rld67'KcE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #ZYVc|sT+  
{ B, TB3 {  
 //{{AFX_DATA_INIT(CAboutDlg) 8;Yx<woR  
 //}}AFX_DATA_INIT WC.t_"@  
} 59O?_F9  
++V=s\d7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N(y\dL=v  
{ Lz:(6`S  
 CDialog::DoDataExchange(pDX); K)\M5id]  
 //{{AFX_DATA_MAP(CAboutDlg) L7V G`h;  
 //}}AFX_DATA_MAP U`Wauv&  
} [$ejp>'Ud  
GQ9\'z#+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M $Es%  
 //{{AFX_MSG_MAP(CAboutDlg) brdmz}  
 // No message handlers `.x Fiyc  
 //}}AFX_MSG_MAP /ew Ukc8,  
END_MESSAGE_MAP() 3 AsT  
`kU/NKq  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) il \$@Bn  
: CDialog(CCaptureDlg::IDD, pParent) hNd}Y'%V  
{ !kE-_dY6)  
 //{{AFX_DATA_INIT(CCaptureDlg) aEWWFN  
  m_bControl = FALSE; ]Yvga!S"C  
  m_bAlt = FALSE; &9"-`-[e:  
  m_bShift = FALSE; "Q?k'^@  
  m_Path = _T("c:\\"); ^",ACWF4Sk  
  m_Number = _T("0 picture captured."); -$WYj "  
  nCount=0; opJMS6%r  
  bRegistered=FALSE; hWT[L.>k  
  bTray=FALSE; j'BMAn ?  
 //}}AFX_DATA_INIT QNxl/y\l0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !ykx^z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Vgyew9>E  
} ijdXU8  
!}r% u."  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]f_6 '|5 A  
{ 8G5m{XTS(  
 CDialog::DoDataExchange(pDX); >+ 4huRb  
 //{{AFX_DATA_MAP(CCaptureDlg) ,$ ^C4I  
  DDX_Control(pDX, IDC_KEY, m_Key); r?*NhLG ;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L[20m (6?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o`q_wdy?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !ZI7&r`u;  
  DDX_Text(pDX, IDC_PATH, m_Path); -atGlu2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); & _g TD  
 //}}AFX_DATA_MAP ]Wq?H-B{  
} S:x?6IDPC^  
sPb=82~z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;XDz)`c  
//{{AFX_MSG_MAP(CCaptureDlg) N]<!j$pOz  
 ON_WM_SYSCOMMAND() K&U7H:  
 ON_WM_PAINT() ,+ #6Y_  
 ON_WM_QUERYDRAGICON() NSFs\a@1  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sqS=qC  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zBP>jM(8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n]u<!.X  
//}}AFX_MSG_MAP %T[^D&9$,  
END_MESSAGE_MAP() ^+1#[E  
L:k9# 6  
BOOL CCaptureDlg::OnInitDialog() D^-7JbE]  
{ if]Noe  
 CDialog::OnInitDialog(); @mBX~ ?=Z3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  =Mb1o[  
 ASSERT(IDM_ABOUTBOX < 0xF000); h#hxOVl%x  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ~(@ E`s&{  
 if (pSysMenu != NULL) XK5<Tg  
 { Cb_oS4vM  
  CString strAboutMenu; J-<^P5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [M%9_CfZOy  
  if (!strAboutMenu.IsEmpty()) wfP5@!I  
  { =SAU4xjo  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3w!c`;c%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3J=Y9 }  
  } hHPs&EA.p  
 } /2m?15c+  
 SetIcon(m_hIcon, TRUE); // Set big icon D>!6,m2  
 SetIcon(m_hIcon, FALSE); // Set small icon wM _ 6{  
 m_Key.SetCurSel(0); 7HHysNB"w  
 RegisterHotkey(); w?,M}=vg  
 CMenu* pMenu=GetSystemMenu(FALSE); 3F#+~^2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); '/I:^9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); & ``d  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U5]pi+r  
 return TRUE; // return TRUE unless you set the focus to a control ]O:N-Y  
} [,aqQ6S  
TbehR:B5g  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lI/0:|l  
{ =5s F"L;b  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ((rv]f{  
 { L@^~N$G&u  
  CAboutDlg dlgAbout; CZEW-PIhj  
  dlgAbout.DoModal(); z1!6%W_.  
 } Cj*-[ EL<  
 else [Lp,Hqi5  
 { vLO&Lpv  
  CDialog::OnSysCommand(nID, lParam); 0~& "  
 } e0;  
} ?Mp1~{8  
1|?K\B  
void CCaptureDlg::OnPaint() u7;~  
{ ~^vC,]hU  
 if (IsIconic()) ?_`0G/xl  
 { Y1dVM]l  
  CPaintDC dc(this); // device context for painting YGsS4ia*4i  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <TNk?df7  
  // Center icon in client rectangle 8#` 6M5  
  int cxIcon = GetSystemMetrics(SM_CXICON); F pt-V  
  int cyIcon = GetSystemMetrics(SM_CYICON); M)cGz$Q|  
  CRect rect; 9B)(>~q  
  GetClientRect(&rect); -s$<Op{s  
  int x = (rect.Width() - cxIcon + 1) / 2; %TrF0{NR90  
  int y = (rect.Height() - cyIcon + 1) / 2; G*\h\ @  
  // Draw the icon ZB5?!.ND  
  dc.DrawIcon(x, y, m_hIcon); L<(VG{)Z  
 } 2*U.^]~"{  
 else l oqvi  
 { >m_v5K  
  CDialog::OnPaint(); {Ts:ZI+ 8d  
 } 4%*hGh=  
} YYRT.U'  
WP-jtZ?!"  
HCURSOR CCaptureDlg::OnQueryDragIcon() =z:U~D  
{ J -Qh/d%]  
 return (HCURSOR) m_hIcon; 'Zk<l#"}  
} /'y5SlE[J  
U '[?9/T  
void CCaptureDlg::OnCancel() 0zqj0   
{ 7SI)1_%G  
 if(bTray) "uu)2Xe  
  DeleteIcon(); ^Y^"'"  
  CDialog::OnCancel(); S=gW(c2'  
} 6T^lS^  
{TZE/A3D,  
void CCaptureDlg::OnAbout() b"8FlZ$  
{ { U <tc4^  
 CAboutDlg dlg; J"[3~&em  
 dlg.DoModal(); >zL |8f  
} Goj4`Hc  
|*Ot/TvG  
void CCaptureDlg::OnBrowse() xaXV ^ZM3  
{ 7;HUE!5,^l  
 CString str; Bt>}LLBS2  
 BROWSEINFO bi; -[.PH M6+?  
 char name[MAX_PATH]; KR3-Hb4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); j%M @#  
 bi.hwndOwner=GetSafeHwnd(); B- Y+F  
 bi.pszDisplayName=name; }(=ml7)v  
 bi.lpszTitle="Select folder"; $e/*/.  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,L-C(j  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); + x_ wYv  
 if(idl==NULL) ci7~KewJ*  
  return;  nhfwOS  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?"@ET9  
 str.ReleaseBuffer(); [&n|\!  
 m_Path=str; onzA7Gre  
 if(str.GetAt(str.GetLength()-1)!='\\') -fM1$/]  
  m_Path+="\\"; z\[(g  
 UpdateData(FALSE); fH!=Zb_{8  
} 3@X|Gs'_S  
x_ySf!ih  
void CCaptureDlg::SaveBmp() #D:RhqjK  
{ yGV{^?yoP  
 CDC dc; L; C|ow^c  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); s<{GpWT8  
 CBitmap bm; 5 TET<f6R  
 int Width=GetSystemMetrics(SM_CXSCREEN); &9h  
 int Height=GetSystemMetrics(SM_CYSCREEN); 6 ZHv,e`?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ork|yj/A  
 CDC tdc; Ij$)RSPtH  
 tdc.CreateCompatibleDC(&dc); #f 9qlM32  
 CBitmap*pOld=tdc.SelectObject(&bm); X0x_+b? _  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cX"G7Bh  
 tdc.SelectObject(pOld); j}RM.C\7  
 BITMAP btm; 'WnpwY  
 bm.GetBitmap(&btm); 8AX3C s_G  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tAt;bYjb\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jQIV2TY[  
 BITMAPINFOHEADER bih; .ftUhg  
 bih.biBitCount=btm.bmBitsPixel; a?\ `  
 bih.biClrImportant=0; #?5VsD8  
 bih.biClrUsed=0; .6I%64m  
 bih.biCompression=0; 8"pA9Mr  
 bih.biHeight=btm.bmHeight; j5A\y^Kv  
 bih.biPlanes=1; kpY%&  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^B6`e^ <  
 bih.biSizeImage=size; jM;d>Gymx  
 bih.biWidth=btm.bmWidth; fcn_<Yh0W  
 bih.biXPelsPerMeter=0; ^1vq{/ X  
 bih.biYPelsPerMeter=0; y (ldO;.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :!hk~#yvJ9  
 static int filecount=0; nO%<;-=u\  
 CString name; wtUG^hV #_  
 name.Format("pict%04d.bmp",filecount++); @hBx, `H^  
 name=m_Path+name; PKATw>zg<  
 BITMAPFILEHEADER bfh; `ITDTZ J  
 bfh.bfReserved1=bfh.bfReserved2=0; G)K9la<p  
 bfh.bfType=((WORD)('M'<< 8)|'B'); I BF.&[[S  
 bfh.bfSize=54+size; f 3\w99\o  
 bfh.bfOffBits=54; r6<ArX$Yl  
 CFile bf; ; S{ZC5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hiT9H5 6 >  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :hi$}xHa  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *Y^5M"AB_  
  bf.WriteHuge(lpData,size); Wa@6VY  
  bf.Close(); Psg +\14  
  nCount++; ~V|KT}H  
 } s@R3#"I  
 GlobalFreePtr(lpData); mfUKHX5  
 if(nCount==1) ]IL3$eR  
  m_Number.Format("%d picture captured.",nCount); #`2GAM];7  
 else sCuQBZ h  
  m_Number.Format("%d pictures captured.",nCount); s 0 =@ &/  
  UpdateData(FALSE); mq>*W' M  
} Pau&4h0  
ok8JnQC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I]s:Ev[~  
{ !<JG&9ODP  
 if(pMsg -> message == WM_KEYDOWN) t"4Rn<-  
 { oo"JMD)  
  if(pMsg -> wParam == VK_ESCAPE) >!CH7wX  
   return TRUE; |J @|  
  if(pMsg -> wParam == VK_RETURN) c|8KT  
   return TRUE; 2-/YYe;C  
 } 47$-5k30  
 return CDialog::PreTranslateMessage(pMsg); m^(E:6T  
} 9QO!vx  
+/1P^U /  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) % DHP  
{ V1AEjh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +K @J*W 1  
  SaveBmp(); \:18Uoe7  
  return FALSE; jp\JwE  
} R;N>#_9HU  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ KG7X8AaK#  
 CMenu pop; $]`'Mi  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $/-wgyP3m+  
 CMenu*pMenu=pop.GetSubMenu(0); 4l#T_y  
 pMenu->SetDefaultItem(ID_EXITICON); :$u{  
 CPoint pt; FlM.D u  
 GetCursorPos(&pt); d60Fi#3d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '8((;N|I^  
 if(id==ID_EXITICON) U(=f5|-  
  DeleteIcon(); *U5> j#,  
 else if(id==ID_EXIT) *]DJAF]  
  OnCancel();  G$cq   
 return FALSE; D q_{O  
} [M zc^I&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8Y;zs7Y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) CgPZvB[  
 AddIcon(); 8[{0X4y3  
 return res; S'H0nJ3  
} `U?H^,FVA  
"ZK5P&d  
void CCaptureDlg::AddIcon() h-)A?%Xt  
{ =6q*w^ET  
 NOTIFYICONDATA data; SS<+fWXE  
 data.cbSize=sizeof(NOTIFYICONDATA); yz&q2  
 CString tip; hU)f(L  
 tip.LoadString(IDS_ICONTIP); o^"d2=  
 data.hIcon=GetIcon(0); \]d*h]Hms  
 data.hWnd=GetSafeHwnd(); zI*/u)48  
 strcpy(data.szTip,tip); hZF&PV5H  
 data.uCallbackMessage=IDM_SHELL; ![."xHVeL  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =Q8^@i4[&D  
 data.uID=98; 9gIJX?  
 Shell_NotifyIcon(NIM_ADD,&data); yP=isi#dDY  
 ShowWindow(SW_HIDE); :Pp;{=J  
 bTray=TRUE; F|3FvxA  
} '<E8< bi  
/dP8F  
void CCaptureDlg::DeleteIcon() JNz"lTt>[g  
{ NByN}e  
 NOTIFYICONDATA data; aPP<W|Cmo2  
 data.cbSize=sizeof(NOTIFYICONDATA); Q)|LiCR,  
 data.hWnd=GetSafeHwnd(); !NY^(^   
 data.uID=98; SJuf`  
 Shell_NotifyIcon(NIM_DELETE,&data); .$x[!fuuR&  
 ShowWindow(SW_SHOW); $@f3=NJ4k  
 SetForegroundWindow(); mUY:S |  
 ShowWindow(SW_SHOWNORMAL); Gw\HL  
 bTray=FALSE; Q Fqv,B\<  
} !Z2n;.w  
#dm@%~B{.  
void CCaptureDlg::OnChange() ).`a-Pv  
{ Z*Hxrw\!0  
 RegisterHotkey(); <rI$"=7  
} gkn/E}K#  
i3WmD@  
BOOL CCaptureDlg::RegisterHotkey() fvAV[9/-  
{ hADb]O  
 UpdateData(); 3jdB8a]T_  
 UCHAR mask=0; EG8R*Cm,}  
 UCHAR key=0; ?m7"G)  
 if(m_bControl) r[4F?W  
  mask|=4; %v)'`|i  
 if(m_bAlt) vo<#sa^,j  
  mask|=2; )Is*- W  
 if(m_bShift) HNyDWD)_  
  mask|=1; a7d-  
  key=Key_Table[m_Key.GetCurSel()]; PC7.+;1  
 if(bRegistered){ v#2qwd3x  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KKXb,/  
  bRegistered=FALSE; OQ*. ho  
 } '>3RZ& O  
 cMask=mask; j1CD;9i)%  
 cKey=key; c,%>7U(w_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3E@&wpj  
 return bRegistered; [bVP2j  
} nt`l6b  
sO-R+G/^7  
  四、小结 #zD+DBTAu  
Ntrn("!  
  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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