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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: M -df Gk  
  b1;80P/:D  
  一、实现方法 ^4yFLqrC  
GZ]; U] _  
  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: daZY;_{"o  
ATU 2\Y  
#pragma data_seg("shareddata") =kvYE,,g_  
HHOOK hHook =NULL; //钩子句柄 >p 7e6%  
UINT nHookCount =0; //挂接的程序数目 RSY{IY  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 cwxO| .m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &?<o692  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3RP}lb  
static int KeyCount =0; %G$KahxV>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vF=d`T<  
#pragma data_seg() NY ZPh%x  
pFg9-xd%  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Z\y@rp\l  
eID"&SSU  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: HBL)_c{/O  
)nS;]7pB@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR d\V\,% &.  
cKey,UCHAR cMask) PU^Z7T);  
{ BS#@ehdig  
 BOOL bAdded=FALSE; f,Sybf/uHh  
 for(int index=0;index<MAX_KEY;index++){ KPUc+`cN%  
  if(hCallWnd[index]==0){ &k?Mt #J  
   hCallWnd[index]=hWnd; (6G5UwSt  
   HotKey[index]=cKey; RCq_FY  
   HotKeyMask[index]=cMask; @"H+QVJ@  
   bAdded=TRUE; fmvv q1G&  
   KeyCount++; '+ |{4-V  
   break; m(8t |~S  
  } @fbB3  
 } H0s,tTK8  
 return bAdded; g!O(@Sqp1  
} m4 *Rr  
//删除热键 E#T-2^nD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?zNv7Bj  
{ (+9_nAgZ,  
 BOOL bRemoved=FALSE; HQ+:0" B  
 for(int index=0;index<MAX_KEY;index++){ xS,#TU;)Ol  
  if(hCallWnd[index]==hWnd){ GjA;o3(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 52>?l C  
    hCallWnd[index]=NULL; kG+CT  
    HotKey[index]=0; c|Nv^V*2  
    HotKeyMask[index]=0; d3(T=9;f2  
    bRemoved=TRUE; - iS\3P.  
    KeyCount--; u[^(s_  
    break; Ajhrsa\~a  
   } gBq,So  
  } 8lt P)K4  
 } 2|#3rF  
 return bRemoved; +MeEy{;  
} pscCXk(|A`  
0%+TU4Xx  
G;MgrA#\  
  DLL中的钩子函数如下: Sg0 _l(  
hsljJvs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }$;T.[ ~  
{ fdzD6K ZI  
 BOOL bProcessed=FALSE; bI=\n)sEz  
 if(HC_ACTION==nCode) z1F[okLA  
 { S~ }?6/G.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z$`=7 afp  
   switch(wParam) s&M6DFlA  
   {  HlY4%M5q/  
    case VK_MENU: >0i?}  
     MaskBits&=~ALTBIT; Tfgx>2  
     break; } CJQC  
    case VK_CONTROL: d"nE+pgE  
     MaskBits&=~CTRLBIT; O.1Z3~r-N  
     break; w-|i8%X  
    case VK_SHIFT: aIZ@5w"7  
     MaskBits&=~SHIFTBIT; |jaUVE_2[  
     break; &|26x >  
    default: //judge the key and send message ^C@uP9g  
     break; L$@^EENS  
   } 6$b"tdP  
   for(int index=0;index<MAX_KEY;index++){ >wM%|j'  
    if(hCallWnd[index]==NULL) SA{A E9y  
     continue; ZsUxO%jP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Cfb/f]*M  
    { zpIl'/ i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vBQ5-00YY=  
     bProcessed=TRUE; 2 ,;+)  
    } +*d,non6v  
   } pH?VM&x  
  } ?Gj$$IAe  
  else if((lParam&0xc000ffff)==1){ //有键按下 3b{8c8N^  
   switch(wParam) @=b0>^\m  
   { As1Er[>  
    case VK_MENU: #* S0d1  
     MaskBits|=ALTBIT; )AqM?FE4R  
     break; B.K"1o  
    case VK_CONTROL: VE6T&fz`  
     MaskBits|=CTRLBIT; yK0Q,   
     break; #v')iR"  
    case VK_SHIFT: {`KgyC W:  
     MaskBits|=SHIFTBIT; ^Q4w<sX'  
     break; ||}|=Sz  
    default: //judge the key and send message $ah, $B  
     break; 1?)<*[  
   } I1&Z@[  
   for(int index=0;index<MAX_KEY;index++){ m^O:k"+!  
    if(hCallWnd[index]==NULL) McxJ C<  
     continue; hn.9j"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AzN.vA)q  
    { ,u{d@U^)3@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bu%@1:l  
     bProcessed=TRUE; o]}b#U8S  
    } pt(GpbtWK  
   } ()(@Qcc  
  } C 1|e1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q]w;o&eo  
   for(int index=0;index<MAX_KEY;index++){ fmA&1u/xMs  
    if(hCallWnd[index]==NULL) HHCsWe-  
     continue; Fx0K.Q2Y0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Nt&}T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R/b)hP ~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vf~q%+UqK  
   } BYVp~!u  
  } ZHICpL  
 } xh @H@Q\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?9v!UT&#  
} y*\ M7}](  
h^~eTi;c]Q  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~0|~Fg  
L`x:Y>C(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Fmt5"3B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \@['V   
rd0BvQ9TK  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: aAu upPu  
\?GUGs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T!pWU*aB  
{ j"_V+)SD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p."pI Bd  
 { vV#Jl) A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +tdt>)a  
  SaveBmp(); w^p 'D{{  
  return FALSE; 20 zIO.&o  
 } B HoZ}1_  
 …… //其它处理及默认处理 "KW\:uc /  
} QCa$<~c  
>efYpd#^  
g*- K!X6l  
  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。 i<bFF03*S  
mmTc.x 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。 &]pW##  
TxN#3m?G  
  二、编程步骤 A:p7\Kp;5}  
;TMH.E,h:  
  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"; z6|P]u  
`8xe2=Ub  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6rt.ec(  
eAu3,qoM  
  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; rNfua   
0}PW?t76  
  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; =o{zw+|% %  
',kYZay  
  5、 添加代码,编译运行程序。 vj[ .`fY  
$62ospR^Y  
三、程序代码 9j:?s;B  
GZXUB0W\@)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL l K}('7\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H`),PY2  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +X cB5S>  
#if _MSC_VER > 1000 q^( [ & +  
#pragma once l]T|QhiVd  
#endif // _MSC_VER > 1000 ZaH<\`=%  
#ifndef __AFXWIN_H__ '"~|L>F%G  
#error include 'stdafx.h' before including this file for PCH hP`3Ao  
#endif N: d`L+tcc  
#include "resource.h" // main symbols GLnj& Ve  
class CHookApp : public CWinApp %OfaBv&  
{ 8$OE<c?#5n  
 public: 2!7wGXm~U  
  CHookApp(); yFl@ z  
  // Overrides ]#j]yGV  
  // ClassWizard generated virtual function overrides Rw^4S@~T  
  //{{AFX_VIRTUAL(CHookApp) V_Wv(G0-\  
 public: `-]*Qb+  
  virtual BOOL InitInstance(); f@[q# }6  
  virtual int ExitInstance(); =6ZZ/+6b  
  //}}AFX_VIRTUAL Ct|iZLh`j  
  //{{AFX_MSG(CHookApp) Eae]s8ek9  
  // NOTE - the ClassWizard will add and remove member functions here. N=zrY`Vd  
  // DO NOT EDIT what you see in these blocks of generated code ! 3)atqM)i  
  //}}AFX_MSG -?2ThvT  
  DECLARE_MESSAGE_MAP() ~-A5h(  
}; #&1mc_`/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,D+pGxbr   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h[ba$S,T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z1T.\mzfX  
BOOL InitHotkey(); BtVuI5*h  
BOOL UnInit(); 5mnIQ~psR  
#endif QC \8Zy  
dL |D  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,K+K`"Oy  
#include "stdafx.h" (/v(.t  
#include "hook.h" 9{'GrL  
#include <windowsx.h> -+Kx^V#'R  
#ifdef _DEBUG 8"N<g'Yl,  
#define new DEBUG_NEW "sUL"i  
#undef THIS_FILE w%S\)wjS  
static char THIS_FILE[] = __FILE__; [,8@oM#  
#endif a7%5Qg9B;  
#define MAX_KEY 100 nP0|nPWz#  
#define CTRLBIT 0x04 9,`WQ+OI  
#define ALTBIT 0x02 %%G2w6 3M  
#define SHIFTBIT 0x01 (O\5gAx  
#pragma data_seg("shareddata")  zy  
HHOOK hHook =NULL; %g kR G66  
UINT nHookCount =0; 5^ARC^v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey i`FevAx;[m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT iNe;h|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^0pd- n@pn  
static int KeyCount =0; ? Z.p.v  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift aVNRhnM  
#pragma data_seg() *q=pv8&*s  
HINSTANCE hins; ">v76%>Z7  
void VerifyWindow(); eL0U5>#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ht (RX  
//{{AFX_MSG_MAP(CHookApp) =n cu# T]  
// NOTE - the ClassWizard will add and remove mapping macros here. 8l~] }2LAs  
// DO NOT EDIT what you see in these blocks of generated code! ltwX-   
//}}AFX_MSG_MAP Ha[Bf*  
END_MESSAGE_MAP() brl(7_ 2  
r0+lH:G*q  
CHookApp::CHookApp() u+&BR1)C  
{ 7!]$XGz[  
 // TODO: add construction code here, 0 x4Xs  
 // Place all significant initialization in InitInstance ]p\7s  
} )U`6` &F  
QpBgG~h"  
CHookApp theApp; &;&i#ZO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ew*_@hVC  
{ Oq7M1|{  
 BOOL bProcessed=FALSE; V\W?@V9g-  
 if(HC_ACTION==nCode) x{*g^f  
 { d/v{I  
  if((lParam&0xc0000000)==0xc0000000){// Key up SGXXv  
   switch(wParam) Mi%i_T^i  
   { COH0aNp;  
    case VK_MENU: @mSdksB/L  
     MaskBits&=~ALTBIT; X#EMmB!  
     break; ONH!ms(kb  
    case VK_CONTROL: [ %cW ?@  
     MaskBits&=~CTRLBIT; s{(aW5$!s  
     break; cV\(Z6u  
    case VK_SHIFT: 3=RVJb  
     MaskBits&=~SHIFTBIT; |F=!0Id<  
     break; 9.{u2a\  
    default: //judge the key and send message ({v$!AAv  
     break; ^ |z|kc  
   } B5GT^DaT  
   for(int index=0;index<MAX_KEY;index++){ JF!JY( U,  
    if(hCallWnd[index]==NULL) yS^";$2Tc  
     continue; mKugb_d?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b|^g51v  
    { R9A8)dDz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]i(tou-[i  
     bProcessed=TRUE; (dd+wx't  
    } v8Vw.Ce`f  
   } N7Kq$G2O  
  } NoTEbFrV  
  else if((lParam&0xc000ffff)==1){ //Key down Se.\wkl#Y  
   switch(wParam) _PLY<i2vr  
   { {_&'tXL  
    case VK_MENU: i ?&t@"'  
     MaskBits|=ALTBIT; )r3}9J  
     break; :hJHjh  
    case VK_CONTROL: = NHuj.  
     MaskBits|=CTRLBIT; /{>$E>N;  
     break; IppzQ0'=y1  
    case VK_SHIFT: Ls< ";QJc  
     MaskBits|=SHIFTBIT; /2N'SOX  
     break; G0oY`WXOB  
    default: //judge the key and send message ~b}a|K  
     break; 0{^@kxV  
   } 5\gL+ qM0  
   for(int index=0;index<MAX_KEY;index++) GqMa|8j  
   { `% IzW2v6  
    if(hCallWnd[index]==NULL) -^LUa]"E  
     continue; +;^Ux W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xP#vAR  
    { m5m}RWZ#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !~Gx@Ro  
     bProcessed=TRUE; :)o 4fOJ8  
    } -sO[,  
   } sU!h^N$  
  } Rah"La  
  if(!bProcessed){ Cuu yG8  
   for(int index=0;index<MAX_KEY;index++){ 3#N'nhUzA  
    if(hCallWnd[index]==NULL) 1/X@~  
     continue; K2$ fKju  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kW#,o9f\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XtY!fo *  
   } 1N6.r:wg)%  
  } +Ysm6n '  
 } 5pSo`)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W!vN (1:(  
} wNo2$>*  
jr[(g:L   
BOOL InitHotkey() 'D`O4TsP>  
{ "yaz!?O>  
 if(hHook!=NULL){ '!eg9}<  
  nHookCount++; rQmDpoy=  
  return TRUE; Y-!~x0-H  
 } |osu4=s|  
 else XJg8-)T#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j/.$ (E   
  if(hHook!=NULL) \ #<.&`8B  
   nHookCount++; EQe!&;   
  return (hHook!=NULL); \WS2g"(  
} }L mhM  
BOOL UnInit() ffoL]u\  
{ <A|X4;  
 if(nHookCount>1){ 3y^PKIIrt  
  nHookCount--; %Ms"LoK  
  return TRUE; X$*MxMNs  
 } dbn9t7'{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L\0;)eJ#M  
 if(unhooked==TRUE){ LLyw9y1  
  nHookCount=0; %+ln_lgD:  
  hHook=NULL; aa|u *afWQ  
 } UWU(6J|Fk  
 return unhooked; ] V|hDU=t  
} xgDd5`W  
5OEo(&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <PLQY  
{ #IJm*_J<  
 BOOL bAdded=FALSE; 44Dytpvg  
 for(int index=0;index<MAX_KEY;index++){ Lk%`hsv  
  if(hCallWnd[index]==0){ CFE  ubEb  
   hCallWnd[index]=hWnd; &T.d"i  
   HotKey[index]=cKey; G47(LE"2b  
   HotKeyMask[index]=cMask; !8g419Yg  
   bAdded=TRUE; hcn $uyP  
   KeyCount++; ?^Gi;d5  
   break; ,+w9_Gy2H  
  } w8=&rzr8  
 } Vn&{yCm3  
 return bAdded; cp1-eR_&  
} /80H.|8O  
]MD,{T9l\>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @!p bR(8  
{ Ibf~gr(j  
 BOOL bRemoved=FALSE; 1O#]qZS}]  
 for(int index=0;index<MAX_KEY;index++){ 7gWT[  
  if(hCallWnd[index]==hWnd){ j1zrjhXI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (vX) <Z !  
    hCallWnd[index]=NULL; Zv]'9,cbk  
    HotKey[index]=0; / esdtH$=  
    HotKeyMask[index]=0; 6=cfr; BH2  
    bRemoved=TRUE; ( p(/  
    KeyCount--; yMG(FAyu  
    break; z*V 8l*  
   } su$IXI#R-&  
  } 9sP;s^#t7U  
 } j_I[k8z  
 return bRemoved; In[rxT~K}Q  
} WCNycH+1  
zA%YaekJ  
void VerifyWindow() mkE_ a>  
{ sKy3('5;  
 for(int i=0;i<MAX_KEY;i++){ <OH{7>V  
  if(hCallWnd!=NULL){ WCTmf8f  
   if(!IsWindow(hCallWnd)){ e{Q;,jsh  
    hCallWnd=NULL; ai7R@~O:_k  
    HotKey=0; "D\>oFu  
    HotKeyMask=0; - -fRhN>  
    KeyCount--; Bd'X~Vj<  
   } ?"F9~vx&G  
  } ol0i^d*9F  
 } nxWm  
} @4t_cxmD  
7vo8lnQ{  
BOOL CHookApp::InitInstance() {EfA#{x  
{ QdIx@[+WOq  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _sb~eB~<(  
 hins=AfxGetInstanceHandle(); i:a*6b.U@N  
 InitHotkey(); -Oi8]Xw^@y  
 return CWinApp::InitInstance(); @T"-%L8PL  
} [psZc'q  
dhX$b!DA  
int CHookApp::ExitInstance() ^h$^j  
{ [vGkr" =  
 VerifyWindow(); O~Jm<  
 UnInit(); <x8I<K  
 return CWinApp::ExitInstance(); &4O2uEW0  
} YpOcLxFL  
5cvvdO*C0  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +\doF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |(%=zb=?X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ t$Bu<frQ  
#if _MSC_VER > 1000 bm*.*A]  
#pragma once KqN;a i,F  
#endif // _MSC_VER > 1000 4U8N7  
)x,/+R]{8l  
class CCaptureDlg : public CDialog GE8.{P  
{ u`.3\Geh  
 // Construction 4s e6+oJe  
 public: E<ILZpP  
  BOOL bTray; r6eZ-V`4  
  BOOL bRegistered; <{+U- ^rzR  
  BOOL RegisterHotkey(); w%?Zb[!&  
  UCHAR cKey; 5tI#UBha  
  UCHAR cMask; zv7)JH7EV&  
  void DeleteIcon(); &cWC&Ws"  
  void AddIcon(); GlHP`&;UH  
  UINT nCount; mm9uhlV8  
  void SaveBmp(); x?UAj8z6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {?;qy\m]o  
  // Dialog Data `;=-71Gn~  
  //{{AFX_DATA(CCaptureDlg) p[O\}MAd#  
  enum { IDD = IDD_CAPTURE_DIALOG }; +7Uv|LZ~@  
  CComboBox m_Key;  0ij YE  
  BOOL m_bControl; %aI,K0\  
  BOOL m_bAlt; i zYC0T9  
  BOOL m_bShift; J(G-c5&=  
  CString m_Path; y| 0!sNg  
  CString m_Number; <vE|QxpR  
  //}}AFX_DATA yH(3 m#  
  // ClassWizard generated virtual function overrides q@G}Hjn  
  //{{AFX_VIRTUAL(CCaptureDlg) o}&{Y2!x  
 public: m-qu<4A/U|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d8uDSy  
 protected: Pl. y9g~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qSDn0^y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V'tqsKQ!  
  //}}AFX_VIRTUAL q;lR|NOh  
  // Implementation ~ _hA{$  
 protected: 8(Q|[  
  HICON m_hIcon; [_KV;qS%/  
  // Generated message map functions r#A*{4wz  
  //{{AFX_MSG(CCaptureDlg) S0Ur{!9\#^  
  virtual BOOL OnInitDialog(); B^!-%_q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )7{r8a  
  afx_msg void OnPaint(); pw&k0?K#  
  afx_msg HCURSOR OnQueryDragIcon(); ymp ik.'  
  virtual void OnCancel(); m2H?VY .^K  
  afx_msg void OnAbout(); g[R4/]K^$  
  afx_msg void OnBrowse(); |ZM>UJ  
  afx_msg void OnChange(); aX~Jk >a0  
 //}}AFX_MSG 76o3Sge:  
 DECLARE_MESSAGE_MAP() 7|o!v);uR  
}; )QW hzY  
#endif a)4%sX*I  
.EPv4[2%F8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gKY6S?  
#include "stdafx.h" yM}3u4FG  
#include "Capture.h" KYZ#.f@  
#include "CaptureDlg.h" @tJ4^<`P{  
#include <windowsx.h> _R(9O?;q  
#pragma comment(lib,"hook.lib") ,J '_Vi  
#ifdef _DEBUG .hM t:BMf*  
#define new DEBUG_NEW E]v]fy"  
#undef THIS_FILE Zb&pH~ 7  
static char THIS_FILE[] = __FILE__; !g`I*ZE+e  
#endif w=CzPNRHH!  
#define IDM_SHELL WM_USER+1 q'/o=De  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o%f:BJS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n|pdYe8\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; eh%{BXW[p  
class CAboutDlg : public CDialog @`#x:p:  
{ hj&~Dn(  
 public: z` YC3_d  
  CAboutDlg(); ::+;PRy_E  
  // Dialog Data DSRmFxkk  
  //{{AFX_DATA(CAboutDlg) f`KO#Wc  
  enum { IDD = IDD_ABOUTBOX }; }OhSCH'o6  
  //}}AFX_DATA W"*2,R[}%  
  // ClassWizard generated virtual function overrides  H2oxD$s  
  //{{AFX_VIRTUAL(CAboutDlg) !-N!Bt8;  
 protected: qe'ssX;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )7]yzc  
  //}}AFX_VIRTUAL FrUqfTi+W  
  // Implementation /\_n5XI1  
 protected: +I-BqA9  
  //{{AFX_MSG(CAboutDlg) kh{3s:RQfC  
  //}}AFX_MSG :<s`)  
  DECLARE_MESSAGE_MAP() ok [_Z;  
}; yf;TIh%)=  
ahIDKvJ4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _g fmo  
{ .P`QCH;Ih  
 //{{AFX_DATA_INIT(CAboutDlg) jV9oTH-  
 //}}AFX_DATA_INIT YF-A8gXS  
} TpwN2 =  
7R7+jL,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3u/AqL  
{ !yVY[  
 CDialog::DoDataExchange(pDX); dA (n,@{  
 //{{AFX_DATA_MAP(CAboutDlg) z;dRzwL  
 //}}AFX_DATA_MAP -%]1q#C>@  
} rQ_]%ies8  
t,dm3+R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jVLJ qWP'!  
 //{{AFX_MSG_MAP(CAboutDlg) Xz)qtDN|(  
 // No message handlers <5mv8'{L  
 //}}AFX_MSG_MAP dWQB1Y*N  
END_MESSAGE_MAP() AC'_#nPL#  
_~MX~M3MB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wPm  
: CDialog(CCaptureDlg::IDD, pParent) Cc*R3vHM6  
{ \'<P~I&p  
 //{{AFX_DATA_INIT(CCaptureDlg) t$~'$kM)<  
  m_bControl = FALSE; /:Gy .  
  m_bAlt = FALSE; rjiHP;-t1  
  m_bShift = FALSE; jDqG9]  
  m_Path = _T("c:\\"); 8!cHRtqK  
  m_Number = _T("0 picture captured."); '<YBoU{ e*  
  nCount=0; ;x 2o|#`b  
  bRegistered=FALSE; oGB|k]6]|  
  bTray=FALSE; {l5fKVb\C  
 //}}AFX_DATA_INIT <xF]ca  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R|'W#"{@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y)]C.V,~  
} rX /'  
+&S6se4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) x~R,rb   
{ ;1PJS_@rX  
 CDialog::DoDataExchange(pDX); j)Ak:l%a  
 //{{AFX_DATA_MAP(CCaptureDlg) 4bp})>}jB  
  DDX_Control(pDX, IDC_KEY, m_Key); '2i !RT-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^9Cu?!xu0  
  DDX_Check(pDX, IDC_ALT, m_bAlt); q^sZP\i,*;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4oH ,_sr  
  DDX_Text(pDX, IDC_PATH, m_Path); :{ZwzJ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Q!qD3<?5  
 //}}AFX_DATA_MAP 1AN$s  
} ppNMXbXR  
NN=^4Xpc:  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 23i2yT  
//{{AFX_MSG_MAP(CCaptureDlg) KK3iui  
 ON_WM_SYSCOMMAND() GF8wKx#J  
 ON_WM_PAINT() __Ksn^I   
 ON_WM_QUERYDRAGICON() Hnk&2bY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) aA52Li  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P_NF;v5 v  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T}=^D=  
//}}AFX_MSG_MAP d)bsyZ;U  
END_MESSAGE_MAP() A9 g%>  
k_,& Q?GtU  
BOOL CCaptureDlg::OnInitDialog() K)! ^NT  
{ Xpn\TD<_I  
 CDialog::OnInitDialog(); [2Zy~`*y{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0QW=2rs  
 ASSERT(IDM_ABOUTBOX < 0xF000); wiZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !rr,(!Ip?O  
 if (pSysMenu != NULL) hL6;n*S=  
 { ~gff{Nzk  
  CString strAboutMenu; fV5$[CL1  
  strAboutMenu.LoadString(IDS_ABOUTBOX); qD ?`Yd  
  if (!strAboutMenu.IsEmpty()) Iq4B%xo6G  
  { bTrusSAl  
   pSysMenu->AppendMenu(MF_SEPARATOR); <7F-WR/2n  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =WW5H\?  
  } $.,B2}'  
 } hEu_mw#  
 SetIcon(m_hIcon, TRUE); // Set big icon 0V>Ho H   
 SetIcon(m_hIcon, FALSE); // Set small icon SU4i'o  
 m_Key.SetCurSel(0); ]#^v754X^T  
 RegisterHotkey(); ]S[/ a  
 CMenu* pMenu=GetSystemMenu(FALSE); E5)0YYjHZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9l &q}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); gee~>l  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :,aY|2si  
 return TRUE; // return TRUE unless you set the focus to a control Sk>=C0f:  
} !pw )sO~  
Vi-Ph;6[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l7qW)<r  
{ MkoK(m{7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) r>peKo[X(  
 { 'WE"$1  
  CAboutDlg dlgAbout; CAC4A   
  dlgAbout.DoModal(); 3MNM<Ih  
 } "W%YsN0  
 else A| A#|D  
 { gh ?[x.U  
  CDialog::OnSysCommand(nID, lParam); o4WQA"VxM  
 } aMhVO(+FW  
} ?@$xLUHR4  
.cQO?UKK  
void CCaptureDlg::OnPaint() Wy7w zt  
{ ,7Hyrx`  
 if (IsIconic()) <n]PD;.4  
 { v;o1c44;  
  CPaintDC dc(this); // device context for painting k Alx m{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }8Y! -qX  
  // Center icon in client rectangle (vZ-0Ep}  
  int cxIcon = GetSystemMetrics(SM_CXICON); m =b7 r  
  int cyIcon = GetSystemMetrics(SM_CYICON); i83~&Q=  
  CRect rect; 8R3{YJ6@T  
  GetClientRect(&rect); xt?-X%oY8  
  int x = (rect.Width() - cxIcon + 1) / 2; .6C/,rQ?c  
  int y = (rect.Height() - cyIcon + 1) / 2; 3;BIwb_  
  // Draw the icon =;uMrb4  
  dc.DrawIcon(x, y, m_hIcon); N~8H\  
 } }-Mg&~e`  
 else d2#NRqgQ  
 { e7@ m i  
  CDialog::OnPaint(); Mt-r`W3 q  
 } 1l#46?]~  
} 8A3/@Z;0S  
#\lvzMjCC  
HCURSOR CCaptureDlg::OnQueryDragIcon() F5 ]<=i  
{ ylZQwICk  
 return (HCURSOR) m_hIcon; >pfeP"[(3  
} J@I>m N1\  
F&czD;F  
void CCaptureDlg::OnCancel() N,Ma\D+^t  
{ ErK1j  
 if(bTray) -t|/g5.w_  
  DeleteIcon(); 6Bjo9,L  
  CDialog::OnCancel(); }OAU5P!rp  
} hbx4[Pf  
Cj8&wz}ez  
void CCaptureDlg::OnAbout() `w:kY9  
{ p!YK~cH[  
 CAboutDlg dlg; zx}+Q B0  
 dlg.DoModal(); ~hvj3zC5xz  
} ~k?rP}>0  
05FGfnq.8  
void CCaptureDlg::OnBrowse() S"h;u=5it  
{ r$={_M$  
 CString str; bLai@mL&a  
 BROWSEINFO bi; e`qrafa  
 char name[MAX_PATH]; V'XEz;Ze  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Qi`3$<W>  
 bi.hwndOwner=GetSafeHwnd(); [Xu8~c X  
 bi.pszDisplayName=name; bzNnEH`^]  
 bi.lpszTitle="Select folder"; ?`U_|Yo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; xOe1v9<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); UGO;5!  
 if(idl==NULL) XMI*obS'z  
  return; bN. G%1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O0#[hY,  
 str.ReleaseBuffer(); |})s0TU  
 m_Path=str;  lrv-[}}  
 if(str.GetAt(str.GetLength()-1)!='\\') 0#J~@1Gf  
  m_Path+="\\"; _ l`F}v  
 UpdateData(FALSE); OX;(Mg|  
} .pUB.l$)  
lw9jk`7^  
void CCaptureDlg::SaveBmp() @ar%`+_  
{ \ =hg^j  
 CDC dc; >+dS PI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); et 1HbX  
 CBitmap bm; 7@;*e=v  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3k)xzv%r`  
 int Height=GetSystemMetrics(SM_CYSCREEN); =IMmtOvJ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zas&gsl-;  
 CDC tdc; jum"T\  
 tdc.CreateCompatibleDC(&dc); SF:98#pg  
 CBitmap*pOld=tdc.SelectObject(&bm); ]XEyG7D  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ; CCg]hX  
 tdc.SelectObject(pOld); FLMiW]?x  
 BITMAP btm; F6q=W#~  
 bm.GetBitmap(&btm); z[c8W@OJ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ta)gOc)r R  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {zcG%b WJ  
 BITMAPINFOHEADER bih; Ep;uz5 ^8  
 bih.biBitCount=btm.bmBitsPixel; l[T-Ak  
 bih.biClrImportant=0; m0bxVV^DK!  
 bih.biClrUsed=0; r*`e%`HU  
 bih.biCompression=0; 9!n:hhJM  
 bih.biHeight=btm.bmHeight; l7VO8p]y[R  
 bih.biPlanes=1; Z?o0Q\ }1  
 bih.biSize=sizeof(BITMAPINFOHEADER); aze#Cn,P}  
 bih.biSizeImage=size; ElW\;C:K*  
 bih.biWidth=btm.bmWidth; MeBTc&S<  
 bih.biXPelsPerMeter=0; DS(>R!bb  
 bih.biYPelsPerMeter=0;  ImhkU%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |M7C=z='  
 static int filecount=0; cj2Smgw&>  
 CString name; gtuSJ+up  
 name.Format("pict%04d.bmp",filecount++); n{4iW_/D  
 name=m_Path+name; zq</(5H  
 BITMAPFILEHEADER bfh; ]"T157F  
 bfh.bfReserved1=bfh.bfReserved2=0; H2jypVs$2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); A5Jadz~  
 bfh.bfSize=54+size; Dr.eos4 ~  
 bfh.bfOffBits=54; ; pBLmm*F  
 CFile bf; u<:uL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \7LL neq  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jv~#'=T'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F `:Q  
  bf.WriteHuge(lpData,size); Eq)b=5qrG?  
  bf.Close(); wMCMrv:  
  nCount++; t`JT  
 } @:zC!dR)G  
 GlobalFreePtr(lpData); s1_Y~<y X  
 if(nCount==1) $JOz7j(  
  m_Number.Format("%d picture captured.",nCount); ,5c7jZ5H  
 else j>JBZ#g  
  m_Number.Format("%d pictures captured.",nCount); d8: $ll  
  UpdateData(FALSE); }6[jJ`=gOx  
} _|C3\x1c  
I'P|:XKI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _K9PA[m5 ~  
{ 3J"`mQ  
 if(pMsg -> message == WM_KEYDOWN) uY~mi9E  
 { /9ORVV  
  if(pMsg -> wParam == VK_ESCAPE) IMD^(k 2  
   return TRUE; hFA |(l6  
  if(pMsg -> wParam == VK_RETURN) {Ycgq%1>]  
   return TRUE; 9mD dX  
 } P[ o"%NZ'  
 return CDialog::PreTranslateMessage(pMsg); $R #_c}  
} MlWKfe<  
Jzf+"%lv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {O _X/y~  
{ aZ~e;}w.Zq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rwDLBpk  
  SaveBmp(); N#M>2b<A/T  
  return FALSE; *x8~}/[T(F  
} ZiR}S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ G%~V b  
 CMenu pop; qY-aR;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :/(G#ZaV  
 CMenu*pMenu=pop.GetSubMenu(0); IA0 vSF:  
 pMenu->SetDefaultItem(ID_EXITICON); esSj 3E  
 CPoint pt; TE&E f$h  
 GetCursorPos(&pt); rrU(>jA!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (Yj6 |`  
 if(id==ID_EXITICON) Q)aoc.f!v  
  DeleteIcon(); ;0WAfu}#H  
 else if(id==ID_EXIT) <T7@,_T  
  OnCancel(); S<]k0bC  
 return FALSE; Ia](CN*;6  
} ek)rsxf1A  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); TSFrv8L  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) BMAWjEr  
 AddIcon(); lJAzG,f  
 return res; `P\H{  
} `{YOl\d_  
X#axCDM-  
void CCaptureDlg::AddIcon() g[i;>XyP  
{ 3\ajnd|  
 NOTIFYICONDATA data; %rs2{Q2k  
 data.cbSize=sizeof(NOTIFYICONDATA); Y_*KAr'{P  
 CString tip; @GAj%MK$  
 tip.LoadString(IDS_ICONTIP); ;L87 %P(.  
 data.hIcon=GetIcon(0); s8(Z&pQ  
 data.hWnd=GetSafeHwnd(); $!G|+OuTR  
 strcpy(data.szTip,tip); umP nw  
 data.uCallbackMessage=IDM_SHELL; !"phz&E5ah  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4Ty?>'*|  
 data.uID=98; xy>$^/[$  
 Shell_NotifyIcon(NIM_ADD,&data); ,eebO~7vB  
 ShowWindow(SW_HIDE); \|X 1  
 bTray=TRUE; [ x>Pf1  
} %+/v")8+?  
1<x5{/CZ  
void CCaptureDlg::DeleteIcon()  e#5WX  
{ gm]q<~eMW  
 NOTIFYICONDATA data; K'8o'S_bF  
 data.cbSize=sizeof(NOTIFYICONDATA); R5MN;xG^  
 data.hWnd=GetSafeHwnd(); d.ywH;  
 data.uID=98; @ ~{TL  
 Shell_NotifyIcon(NIM_DELETE,&data); f4<~_ZGr  
 ShowWindow(SW_SHOW); 7]u_  
 SetForegroundWindow(); ,FYA*}[  
 ShowWindow(SW_SHOWNORMAL); Q +hOW-  
 bTray=FALSE; CNuE9|W(vI  
} gz'{l[  
xz@*V>QT  
void CCaptureDlg::OnChange() ly!3~W  
{ *W2] Kxx*  
 RegisterHotkey(); bg3kGt0  
} c5f57Z  
hTAc}'^$  
BOOL CCaptureDlg::RegisterHotkey() aEQrBs  
{ dG3?(}p+  
 UpdateData(); w2 (}pz:  
 UCHAR mask=0; QN;NuDHN  
 UCHAR key=0; &VjPdu57  
 if(m_bControl) U#Kw+slM  
  mask|=4; , -d2wzhW  
 if(m_bAlt) :;#^gv H  
  mask|=2; *>iJ=H  
 if(m_bShift) M2:3 k  
  mask|=1; ]mJ9CP8P1c  
  key=Key_Table[m_Key.GetCurSel()]; 5FJ%"5n&  
 if(bRegistered){ ! pa7]cZ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mMZ=9 ?m  
  bRegistered=FALSE; WZA1nzRc  
 } +7"UF) ~k  
 cMask=mask; T8LvdzS  
 cKey=key; kVWrZ>McK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); S]ndnxy"b  
 return bRegistered; $m.'d*e5  
} JKYtBXOl  
M9Z9s11{H  
  四、小结 pOy(XUV9O  
S-6i5H"B&  
  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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