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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: _FwK-?4E-  
  ce6__f 5?  
  一、实现方法 C R|lt  
6_4D9 W  
  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: K x~|jq  
A7c/N=Cp^  
#pragma data_seg("shareddata") pNRk.m]  
HHOOK hHook =NULL; //钩子句柄 ./$cMaDJ  
UINT nHookCount =0; //挂接的程序数目 fJWC)E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 F9*g=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 p7H3J?`w1+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u~)`&1{%  
static int KeyCount =0; Y\0}R,]a-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 pZU9^Z?~6  
#pragma data_seg() ci+tdMA  
<ioO,oS'  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 F H1Z 2  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >YUoh-]`  
rhL"i^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,E.' o=Z  
cKey,UCHAR cMask) i>_u_)-  
{ Vn~UB#]'3  
 BOOL bAdded=FALSE; \qUKP"dr  
 for(int index=0;index<MAX_KEY;index++){ v)_nWu  
  if(hCallWnd[index]==0){ `~X!Ll  
   hCallWnd[index]=hWnd; {$ep7;'d  
   HotKey[index]=cKey; #M!!CX*k  
   HotKeyMask[index]=cMask; K|oacOF9  
   bAdded=TRUE; @2*]"/)*0  
   KeyCount++; iH.$f /)N  
   break; 0 &GRPu27  
  } {6oE0;2o'  
 } FaBqj1O1  
 return bAdded; \RVW  
} nbG/c80  
//删除热键 @X3{x\i'I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D13Rx 6b  
{ Nl' )l"  
 BOOL bRemoved=FALSE; "}Me}S<  
 for(int index=0;index<MAX_KEY;index++){ .] `f,^v<c  
  if(hCallWnd[index]==hWnd){ rS1fK1dy s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *Y@nVi  
    hCallWnd[index]=NULL; RyRpl*^  
    HotKey[index]=0; Pm$q]A~  
    HotKeyMask[index]=0; I7&_Xr  
    bRemoved=TRUE; e${>#>  
    KeyCount--; #Mg]GeDJ{  
    break; BYKoel  
   } Ssk}e=]  
  } V i&*&"q  
 } 7$rjlVe  
 return bRemoved; |X`/  
} +78CvjG  
!pJeA)W;  
j w* IO  
  DLL中的钩子函数如下: S"wg2X<  
.Q)|vq^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /cZ-tSC)o  
{ kg`.[{k  
 BOOL bProcessed=FALSE; >Yt/]ta4+  
 if(HC_ACTION==nCode) iKas/8   
 { phE &7*!Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (Y^X0yA/  
   switch(wParam) O+RP3ox"  
   {  RaTH\ >n  
    case VK_MENU: z]3 `*/B  
     MaskBits&=~ALTBIT; %_UN<a  
     break; ,|88r=}  
    case VK_CONTROL: $'pNp B#vH  
     MaskBits&=~CTRLBIT; Va$Pi19 O  
     break; -8N|xQ378  
    case VK_SHIFT: hd 0 'u  
     MaskBits&=~SHIFTBIT; <A9y9|>o  
     break; Jdy=_88MD  
    default: //judge the key and send message %okzOKKX  
     break; X{kpSA~  
   } v2,%K`pAU  
   for(int index=0;index<MAX_KEY;index++){ QKE9R-K TE  
    if(hCallWnd[index]==NULL) +-B^Z On  
     continue; 6:% L![FX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zS< jd~  
    { 2Dd|~{%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <[GYLN[0Q  
     bProcessed=TRUE; L>Mpi$L  
    } C%~a`e|/Y  
   } N0>0z]4;q  
  } [Ei1~n)o  
  else if((lParam&0xc000ffff)==1){ //有键按下 DKVT(#@T  
   switch(wParam) Ys8SDlMo  
   { bJ_cId8+  
    case VK_MENU: V]S1X^  
     MaskBits|=ALTBIT; OMk5{-8B  
     break; 0[<~?`:)  
    case VK_CONTROL: 5b/ojr7  
     MaskBits|=CTRLBIT; Il`tNr  
     break; +wW@'X  
    case VK_SHIFT: U}$DhA"r"  
     MaskBits|=SHIFTBIT; 4'p=p#o  
     break; )f dE6  
    default: //judge the key and send message VGqa)ri"  
     break; irk*~k ?  
   } g=T/_  
   for(int index=0;index<MAX_KEY;index++){ C[WCg9Av  
    if(hCallWnd[index]==NULL) _j>;ipTb+  
     continue; +}Av-47`h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aiCn"j  
    { A>VX*xd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .qob_dRA  
     bProcessed=TRUE; E VQ0l@K  
    } tvd0R$5}  
   } KS*oxZ  
  } ]4 (?BJ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [ $fJRR  
   for(int index=0;index<MAX_KEY;index++){ A$.fv5${  
    if(hCallWnd[index]==NULL) //Ai.Q.J[  
     continue; Gs2p5nL<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vVT?h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O--7<Q\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 IaFr&  
   } ;W:6{9m ze  
  } h8jD }9^  
 } o/o:2p.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S=3^Q;V/1  
} zhB">j8j  
(cv!Y=]  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: !G_jGc=v  
[0[M'![8M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YDmWN#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E2B>b[  
amQz^^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 7-_vY[)/  
~:_0CKa!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) YxJD_R  
{ _{~]/k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `B8tmW#  
 { nT#JOmv  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 x|eeRf|  
  SaveBmp(); 5jq=_mHt  
  return FALSE; @6o]chJo  
 } djT5 X  
 …… //其它处理及默认处理 d77r9  
} N_75-S7Cm  
# fhEc;t  
^%y`u1ab  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 {F|48P;J  
mCKk*5ws5"  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 H;WY!X$x  
ezTZnutZ  
  二、编程步骤 G[idN3+#  
GJ 'spgz  
  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"; y|_Eu:  
OY"6J@[z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ZkB3[$4C=5  
VF0dE  
  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; 6gOe!m m  
NBl __q  
  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_K_f+7  
\Btk;ivg  
  5、 添加代码,编译运行程序。 [RU NuO  
oQ+61!5>  
三、程序代码 Gt/4F-Gn  
jJwkuh8R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2Ohp]G  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 5nCu~<uJ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZI ?W5ISdg  
#if _MSC_VER > 1000 klWYuStZ  
#pragma once _>bRv+RVR  
#endif // _MSC_VER > 1000 J7-^F)lu-  
#ifndef __AFXWIN_H__ R_D c)  
#error include 'stdafx.h' before including this file for PCH Sav`%0q?7a  
#endif %Ny) ?B  
#include "resource.h" // main symbols `{FwTZ=6{  
class CHookApp : public CWinApp 7y*ZXT]f  
{ ,=[*Lo>O  
 public: $R{8z-,Q  
  CHookApp(); g8pm2o@S  
  // Overrides L*]E`Xxd9  
  // ClassWizard generated virtual function overrides >HkhAJhW  
  //{{AFX_VIRTUAL(CHookApp) M:ai<TZ]  
 public: m$y]Lf  
  virtual BOOL InitInstance(); :Eh'(   
  virtual int ExitInstance(); F'J [y"~_  
  //}}AFX_VIRTUAL n+2J Dq|?p  
  //{{AFX_MSG(CHookApp) {w`:KR6o7  
  // NOTE - the ClassWizard will add and remove member functions here. K}I0o!(#  
  // DO NOT EDIT what you see in these blocks of generated code ! ipKG!  
  //}}AFX_MSG \k&1*b?h  
  DECLARE_MESSAGE_MAP() a5`eyL[f  
}; }WP-W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;MTz]c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I>w^2 (y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9Yw]Y5l  
BOOL InitHotkey(); WO%h"'iJ  
BOOL UnInit(); M/jb}*xDR  
#endif )@:l^$x  
ehO:')XF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zsTbdF  
#include "stdafx.h" &^ I+s^\=  
#include "hook.h" 9F_6}.O  
#include <windowsx.h> Ht=$] Px  
#ifdef _DEBUG J^H =i)A  
#define new DEBUG_NEW IKf`[_,t]  
#undef THIS_FILE )bWrd $X  
static char THIS_FILE[] = __FILE__; O<,r>b,  
#endif ,@Z_{,b  
#define MAX_KEY 100 Rlc$; Z9K  
#define CTRLBIT 0x04 rpU/s@%L  
#define ALTBIT 0x02 v}il(w;O  
#define SHIFTBIT 0x01 a[O6YgO  
#pragma data_seg("shareddata") .1ddv4Hk  
HHOOK hHook =NULL; >,g5Hkmqr  
UINT nHookCount =0; N <pbO#e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k0&lu B%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l`rC0kJ]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey dm^H5D/A  
static int KeyCount =0; U'3Fou}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }bfn_ G  
#pragma data_seg() *)PG-$6X&  
HINSTANCE hins; $N.`)S<  
void VerifyWindow(); tjb/[RQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) aV|k}H{wt  
//{{AFX_MSG_MAP(CHookApp) Ku%6$C!,  
// NOTE - the ClassWizard will add and remove mapping macros here. |>s v8/!  
// DO NOT EDIT what you see in these blocks of generated code! 44C+h    
//}}AFX_MSG_MAP )W9_qmYd"  
END_MESSAGE_MAP() /| GH0L  
NV!4(_~  
CHookApp::CHookApp() |[w^eg  
{ ^HFo3V }h  
 // TODO: add construction code here, iK x+6v  
 // Place all significant initialization in InitInstance DPPS?~Pq  
} dM|g`rr E  
^]rxhpS  
CHookApp theApp; u_'nOle K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G\mKCaI8  
{  <qn,  
 BOOL bProcessed=FALSE; H'Iq~Ft1  
 if(HC_ACTION==nCode) HU[oR4E  
 { i=da,W=0  
  if((lParam&0xc0000000)==0xc0000000){// Key up |a(Q4 e/,  
   switch(wParam) ]GS ~i+=M  
   { RSH/l;ii  
    case VK_MENU: ;F,qS0lzE  
     MaskBits&=~ALTBIT; jT"r$""1d  
     break; 8?Wgawx  
    case VK_CONTROL: |4xo4%BQ>  
     MaskBits&=~CTRLBIT; 4hNwKe"Ki  
     break; aiR5/ ZD  
    case VK_SHIFT: .wri5  
     MaskBits&=~SHIFTBIT; H0tF  
     break; 8m7eaZ  
    default: //judge the key and send message /Su)|[/'  
     break; zv9M HC &  
   } #J~Xv:LgD  
   for(int index=0;index<MAX_KEY;index++){ & >b+loF  
    if(hCallWnd[index]==NULL) _sm;HH7'*  
     continue; 4Bo<4 4-,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C >kmIw'  
    { o>K &D$J;O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DrFur(=T  
     bProcessed=TRUE; T:n< db,Px  
    } WJcVQM s  
   } 8}K"IW  
  } qp1\I$Y  
  else if((lParam&0xc000ffff)==1){ //Key down SEU\}Ni{  
   switch(wParam) K!7q!%Ju  
   { Z%;)@0~f  
    case VK_MENU: )BlJ|M  
     MaskBits|=ALTBIT; zkG>u,B}  
     break; 3*2I$e!Jt  
    case VK_CONTROL: ^cb)f_90  
     MaskBits|=CTRLBIT; W2n*bNI  
     break; ioWJj.%  
    case VK_SHIFT: r+TK5|ke  
     MaskBits|=SHIFTBIT; aL 8Gnqf2  
     break; ;&7,7 3!  
    default: //judge the key and send message y*(_\\  
     break; CjmV+%b4  
   } 8qmknJC  
   for(int index=0;index<MAX_KEY;index++) (7 ijt  
   { mLULd}g/o  
    if(hCallWnd[index]==NULL) <4sj@C  
     continue; n`QO(pZ6+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $"1pws?d  
    { `;}H%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q'2`0MRa  
     bProcessed=TRUE; 'oCm.~;_  
    } 2b!j.T#u  
   } *k!(ti[  
  } 9 c6'  
  if(!bProcessed){ 86#-q7aX  
   for(int index=0;index<MAX_KEY;index++){ $ {@q?iol  
    if(hCallWnd[index]==NULL) /Bm#`?(ia  
     continue; :F9q>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qdO[d|d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v#Sj|47  
   } n/?eZx1  
  } B MY>a  
 } 5<^'Cy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \{:%v#ZZ  
} 1ThwvF%Qo  
>kZ6f4  
BOOL InitHotkey() )]tvwEo  
{ {Evcc+E q  
 if(hHook!=NULL){ Z/n3aYM  
  nHookCount++; [Ek42%  
  return TRUE; )ib7K1GJ  
 } htV#5SUx&  
 else ]2LXUYB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OZa88&  
  if(hHook!=NULL) ] ZDTn  
   nHookCount++; #>" }q3RO  
  return (hHook!=NULL); TZj[O1E  
} qj`,qm P  
BOOL UnInit() @+$cZ3,  
{ U @)k3^  
 if(nHookCount>1){ z'T=]- D  
  nHookCount--; keaj3#O  
  return TRUE; ia_Z\q  
 } p %L1uwLG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .hc|t-7f  
 if(unhooked==TRUE){ 487YaioB$  
  nHookCount=0; %N>\:8 5?  
  hHook=NULL; 8.[&wy U  
 } XzW7eO ,A  
 return unhooked; .uBO  
} rAM *\=  
u]P03B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hEWx.  
{ TR~|c|B  
 BOOL bAdded=FALSE; u0s'6=  
 for(int index=0;index<MAX_KEY;index++){ m$,cH>E  
  if(hCallWnd[index]==0){  WN$R[N  
   hCallWnd[index]=hWnd; RZW$!tyI=  
   HotKey[index]=cKey; %3rTQ:X  
   HotKeyMask[index]=cMask; r)OO&. P@j  
   bAdded=TRUE; '7t|I6$ow  
   KeyCount++; [gpOu TW  
   break; ]GQv4-y  
  } n>br,bQe  
 } xC[~Fyhp  
 return bAdded; qQL.c+%L  
} Jc`Rs"2  
\Bt =bu>Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gxI&f  
{ ~:T3|  
 BOOL bRemoved=FALSE; .\Ul!&y  
 for(int index=0;index<MAX_KEY;index++){ ^p$1D  
  if(hCallWnd[index]==hWnd){ L{Q4=p,A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pF|8OB%  
    hCallWnd[index]=NULL; *wV iH  
    HotKey[index]=0; jYrym-  
    HotKeyMask[index]=0; ZH_FA  
    bRemoved=TRUE; stX'yya  
    KeyCount--; `0Yt1Z&  
    break; C%0<1 mp  
   } `'*F 1F  
  } 2H[=l Y  
 } D!X>O}  
 return bRemoved; "Ys_ \  
} $4DFgvy$  
Vu_&~z7h  
void VerifyWindow() Z "-ntx#  
{ 4pLQ"&>}80  
 for(int i=0;i<MAX_KEY;i++){ f( ]R/'o  
  if(hCallWnd!=NULL){ 4g>1G qv6  
   if(!IsWindow(hCallWnd)){ jo<>Hc{g>  
    hCallWnd=NULL; ]Mn&76 fu  
    HotKey=0; `<S/?I8  
    HotKeyMask=0; ZEL/Ndk  
    KeyCount--; SrdE>fNbs  
   } qo6 1O\qm  
  } xR *5q1j  
 } ylkpYd  
} y>@v>S  
RlU;v2Kch  
BOOL CHookApp::InitInstance() B{;11 u  
{ mgo'MW\   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l?})_1v,R  
 hins=AfxGetInstanceHandle(); |.y>[+Qb*  
 InitHotkey(); A(q~{  
 return CWinApp::InitInstance(); fB_4f{E  
} I%pCm||p  
|)28=Z|Z  
int CHookApp::ExitInstance() ^Yf3"D?&  
{ w/qQ(]n8  
 VerifyWindow(); uG2Xkj  
 UnInit(); ARmu{cL  
 return CWinApp::ExitInstance(); BXT 80a\  
} n"XdHW0  
Tq9,c#}&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #x, ]D  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P=f<#l"v  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F"-S~I7'L  
#if _MSC_VER > 1000 NdM}xh  
#pragma once p^p'/$<6_  
#endif // _MSC_VER > 1000 2dv|6p  
U#8\#jo  
class CCaptureDlg : public CDialog D9}d]9]$  
{ "B3iX@C  
 // Construction eA~J4k_  
 public: K{, W_ ^  
  BOOL bTray; ^fA3<|  
  BOOL bRegistered; JOA%Y;`<#  
  BOOL RegisterHotkey(); :X3rd|;kc  
  UCHAR cKey; \%w7D6dEZ  
  UCHAR cMask; \B*k_W/r@  
  void DeleteIcon(); # rh0r`  
  void AddIcon(); '}wG"0  
  UINT nCount; vs5 D:cZ}  
  void SaveBmp(); {KW&wsI  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6$W-?  
  // Dialog Data &Tf=~6  
  //{{AFX_DATA(CCaptureDlg) tfi2y]{A  
  enum { IDD = IDD_CAPTURE_DIALOG }; B(S5+Y  
  CComboBox m_Key; mJwv&E  
  BOOL m_bControl; K~7'@\2 ?  
  BOOL m_bAlt; e 7Yb=/F  
  BOOL m_bShift; M \ :"~XW  
  CString m_Path; ?whRlh  
  CString m_Number; 3c1o,2  
  //}}AFX_DATA 2z.k)Qx!Z  
  // ClassWizard generated virtual function overrides ^AovkK(p  
  //{{AFX_VIRTUAL(CCaptureDlg) 0lLr[  
 public: N%|^;4}k  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fMWXo)rzj  
 protected: (1j(* ?2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @/_XS4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hXV4$Dai  
  //}}AFX_VIRTUAL /V#MLPA  
  // Implementation Iu=pk@*O  
 protected: nG&w0de<>  
  HICON m_hIcon; D]t~S1ycG7  
  // Generated message map functions t:?<0yfp&  
  //{{AFX_MSG(CCaptureDlg) B| $\/xO  
  virtual BOOL OnInitDialog(); H @3$1h&YS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !1ie:z>s  
  afx_msg void OnPaint(); d+gk q\  
  afx_msg HCURSOR OnQueryDragIcon(); yrxx+z|wR  
  virtual void OnCancel(); 0hH Iz4(  
  afx_msg void OnAbout(); oN1!>S9m  
  afx_msg void OnBrowse(); <[ g$N4  
  afx_msg void OnChange(); x]yHBc  
 //}}AFX_MSG ')5jllxv  
 DECLARE_MESSAGE_MAP() iqU.a/~y  
}; !nP8ysB  
#endif cHqvkN`  
TzD:bKE&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o=a:L^nt,  
#include "stdafx.h" "Qiq/"h  
#include "Capture.h" #Pe\Z/  
#include "CaptureDlg.h" kphy7> Km  
#include <windowsx.h> c]cO[T_gGa  
#pragma comment(lib,"hook.lib") lB5[#z  
#ifdef _DEBUG %xH>0  
#define new DEBUG_NEW ,iA2s i  
#undef THIS_FILE 73! x@Duh  
static char THIS_FILE[] = __FILE__; B}TInI%H  
#endif = y,yQO  
#define IDM_SHELL WM_USER+1 A-AN6.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `4"y#Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  6Dr$*9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U 8qKD  
class CAboutDlg : public CDialog &?`d8\z  
{ ; @[.$Q@I  
 public: (&N$W&  
  CAboutDlg(); Sgjr4axu  
  // Dialog Data iTKG,$G  
  //{{AFX_DATA(CAboutDlg) ?kT~)k  
  enum { IDD = IDD_ABOUTBOX }; e+]YCp[(  
  //}}AFX_DATA EmBfiuX  
  // ClassWizard generated virtual function overrides f:)K  
  //{{AFX_VIRTUAL(CAboutDlg) tZJ 9}\r  
 protected: 0qaG#&!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `#IT24!  
  //}}AFX_VIRTUAL *;\ K5  
  // Implementation d~Z:$&r  
 protected: 5sf fDEU]A  
  //{{AFX_MSG(CAboutDlg) kBDe*K.V  
  //}}AFX_MSG Poylq] F  
  DECLARE_MESSAGE_MAP() D@YM}HXuj  
}; 4`^TC[  
5 \.TZMB  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N2S!.H!Wz  
{ $fU/9jTa  
 //{{AFX_DATA_INIT(CAboutDlg) a*$1la'Uf  
 //}}AFX_DATA_INIT duiKFNYN  
} c,[qjr#\>  
G`3vH,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #h5Hi9LKf  
{ -mWw.SfEZ  
 CDialog::DoDataExchange(pDX); $48[!QE  
 //{{AFX_DATA_MAP(CAboutDlg) i,U-H\p&  
 //}}AFX_DATA_MAP ^/5E773  
} ^*owD;]4_  
8Vg`;_-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OU Yb-  
 //{{AFX_MSG_MAP(CAboutDlg) ggYIq*4  
 // No message handlers `P)64So-1  
 //}}AFX_MSG_MAP < 8W:ij.`  
END_MESSAGE_MAP() A%sxMA!K,  
,2:L{8_L  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !&`7  
: CDialog(CCaptureDlg::IDD, pParent) |[n|=ORI'  
{ ="[+6X  
 //{{AFX_DATA_INIT(CCaptureDlg) YM,D`c[pX  
  m_bControl = FALSE; !Z9ikn4A  
  m_bAlt = FALSE; 1<Ztk;$A  
  m_bShift = FALSE; []]LyWk  
  m_Path = _T("c:\\"); hzf}_1  
  m_Number = _T("0 picture captured."); , K"2tb  
  nCount=0; S)AE   
  bRegistered=FALSE; \)6?u_(u  
  bTray=FALSE; -%QEzu&  
 //}}AFX_DATA_INIT Wf&G9Be?8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^ _#gIT\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S+\Mt+o  
} YJtOdgG|q  
jWb\"0)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %/,Uk+3p  
{ y^Xxa'y  
 CDialog::DoDataExchange(pDX); $K>d\{@+7  
 //{{AFX_DATA_MAP(CCaptureDlg) -iZjs  
  DDX_Control(pDX, IDC_KEY, m_Key); J~ gkGso  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |GLn 9vw7S  
  DDX_Check(pDX, IDC_ALT, m_bAlt); eB1eUK>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HpgN$$\@  
  DDX_Text(pDX, IDC_PATH, m_Path); !C)>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =<tJAoVV  
 //}}AFX_DATA_MAP -:1Gr8  
} w]}cB+C+l#  
JeSkNs|vB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5;KT-(q~  
//{{AFX_MSG_MAP(CCaptureDlg) ;lPhSkD  
 ON_WM_SYSCOMMAND() "r `6c0Z  
 ON_WM_PAINT() GmWQJYX\  
 ON_WM_QUERYDRAGICON() 'kONb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) u+i/CE#w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #| e5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) K|' ]Hje\  
//}}AFX_MSG_MAP qm&53  
END_MESSAGE_MAP() $EHn ;~w T  
Ns7l-mb  
BOOL CCaptureDlg::OnInitDialog() J,2v~Dq  
{ ',-X#u  
 CDialog::OnInitDialog(); (fjXp75  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); sC*E;7gT,  
 ASSERT(IDM_ABOUTBOX < 0xF000); [}g5Z=l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .dq.F#2B;  
 if (pSysMenu != NULL) 5<'Jd3N{&  
 { MyR\_)P?  
  CString strAboutMenu; 7Bb@9M?i  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7}HA_@[  
  if (!strAboutMenu.IsEmpty()) ,2L,>?r6  
  { r?{LQWP>e  
   pSysMenu->AppendMenu(MF_SEPARATOR); ri.|EmH2:D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KHC(MdZ  
  } KQy\l+\gM  
 } mwiPvwHrg  
 SetIcon(m_hIcon, TRUE); // Set big icon *g_>eNpXD  
 SetIcon(m_hIcon, FALSE); // Set small icon }t{^*(  
 m_Key.SetCurSel(0); !7Q.w/|=  
 RegisterHotkey(); 9"v ox   
 CMenu* pMenu=GetSystemMenu(FALSE); JL*]9$o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (6_/n&mF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q0cf]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^|axtVhMO  
 return TRUE; // return TRUE unless you set the focus to a control X=RmCc$:  
} 78}%{7YY  
=:T:9Y_i  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,PtR^" Mf4  
{ Czl 8Q oH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "+OMo-<K7  
 { &b:Zln.j  
  CAboutDlg dlgAbout; #B{F{,vlu,  
  dlgAbout.DoModal(); =$`")3y3  
 } (#>5j7i8#  
 else .6]cu{K(  
 { W;j)ux7jMY  
  CDialog::OnSysCommand(nID, lParam); ntUVhIE0  
 } !Kn+*'#  
} cF6@.)  
(>% Vj  
void CCaptureDlg::OnPaint() )FiU1E  
{ .St h  
 if (IsIconic()) %JU23c*  
 { a*@Z^5f  
  CPaintDC dc(this); // device context for painting 60gn`s,,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mTu9'/$(  
  // Center icon in client rectangle o`]FH _  
  int cxIcon = GetSystemMetrics(SM_CXICON); +Gs;3jC^  
  int cyIcon = GetSystemMetrics(SM_CYICON); m^&mCo,  
  CRect rect; *^m.V=  
  GetClientRect(&rect); Gf$>!zXr  
  int x = (rect.Width() - cxIcon + 1) / 2; ojI"<Q~g  
  int y = (rect.Height() - cyIcon + 1) / 2; v*p)"J *  
  // Draw the icon tz> X'L  
  dc.DrawIcon(x, y, m_hIcon); 0{@Ovc  
 } M%LwC/h:,  
 else R1rfp;   
 { p_ y*-,W (  
  CDialog::OnPaint(); tg4&j$  
 } %bETr"Xom  
} )%W2XvG  
8U$UI  
HCURSOR CCaptureDlg::OnQueryDragIcon() jWjK-q@Y  
{ sm <kb@g  
 return (HCURSOR) m_hIcon; F}mwQ%M  
} t$Ji{t-  
Z%d4V<fn  
void CCaptureDlg::OnCancel() ]nGA1S{  
{ "s^@PzQpN  
 if(bTray) ;^SgV   
  DeleteIcon(); 3W00,f^9  
  CDialog::OnCancel(); KV(W|~+rM  
} LA3,e (e  
T"lqPbK  
void CCaptureDlg::OnAbout() MO+0]uh:  
{ Ft>8 YYyU  
 CAboutDlg dlg; %6?}gc_  
 dlg.DoModal(); 2Nzcej  
} -i gZU>0B_  
uZI:Kt#  
void CCaptureDlg::OnBrowse() tG&B D\  
{ a,\u|T:g  
 CString str; ;Q 6e&Ips/  
 BROWSEINFO bi; 3 +9|7=d  
 char name[MAX_PATH]; ;0{*V5A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); KPrxw }P  
 bi.hwndOwner=GetSafeHwnd(); CawVC*b3  
 bi.pszDisplayName=name; X~b+LG/  
 bi.lpszTitle="Select folder"; 8hV:bz"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; k!rz8S"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); JB}h }nb  
 if(idl==NULL) WWs>@lCK  
  return; mjc:0hH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2)]*re)  
 str.ReleaseBuffer(); [^P2Kn  
 m_Path=str; iIRigW  
 if(str.GetAt(str.GetLength()-1)!='\\') 4H '&5  
  m_Path+="\\"; %^A++Z$`  
 UpdateData(FALSE); qa#F}aGd  
} ^DJ U99  
T!$HVHh&,}  
void CCaptureDlg::SaveBmp() ?`iBp+iBv  
{ J?DyTs3 Z  
 CDC dc; )8PL7P84  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S}yb~uc,  
 CBitmap bm; g*9>z)  
 int Width=GetSystemMetrics(SM_CXSCREEN); AX?6Q4Gq1  
 int Height=GetSystemMetrics(SM_CYSCREEN); oDK\v8w-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7qp|Msf},  
 CDC tdc; )f|6=x4  
 tdc.CreateCompatibleDC(&dc); < ,n4|z)  
 CBitmap*pOld=tdc.SelectObject(&bm); VNfx>&`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h{9 pr  
 tdc.SelectObject(pOld); JE!Xf}nEi  
 BITMAP btm; ~<-h# B  
 bm.GetBitmap(&btm); SJe;T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Nzt1JHRS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); SesO$=y  
 BITMAPINFOHEADER bih; Ml ^Tb#  
 bih.biBitCount=btm.bmBitsPixel; w Nnb@  
 bih.biClrImportant=0; s)=7tHoqB)  
 bih.biClrUsed=0; ^4i3#}  
 bih.biCompression=0; WR%iUO40  
 bih.biHeight=btm.bmHeight; |'#NDFI>}  
 bih.biPlanes=1; rZ7 Ihof  
 bih.biSize=sizeof(BITMAPINFOHEADER); %&NK|M+n  
 bih.biSizeImage=size; *?\Nioii  
 bih.biWidth=btm.bmWidth; <#Dc(VhT  
 bih.biXPelsPerMeter=0; 0cVXUTJ|W  
 bih.biYPelsPerMeter=0; K>~l6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S6I8zk)Z4  
 static int filecount=0; >^}z  
 CString name; ~{{:-XkVB  
 name.Format("pict%04d.bmp",filecount++); qlP=Y .H  
 name=m_Path+name; s:{%1/  
 BITMAPFILEHEADER bfh;  }P#gXG  
 bfh.bfReserved1=bfh.bfReserved2=0; DO; 2)ZQ%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L"0L_G  
 bfh.bfSize=54+size; pj`-T"Q  
 bfh.bfOffBits=54; pDT6>2t  
 CFile bf; ,y @3'~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ j=LF1dG"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R8)"M(u=l  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,\IZ/1  
  bf.WriteHuge(lpData,size); (Nf.a4O  
  bf.Close(); it@s(1EO#  
  nCount++; c{q`uI;O  
 } W1z5|-T  
 GlobalFreePtr(lpData); =nl,5^  
 if(nCount==1) J!>oC_0]8  
  m_Number.Format("%d picture captured.",nCount); 9yPB)&"EF  
 else =T`-h"E~@  
  m_Number.Format("%d pictures captured.",nCount); * bK@A2`  
  UpdateData(FALSE); ,# 6\:i  
} /zM7G?y  
<R$|J|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >F v8 -  
{ AseY.0  
 if(pMsg -> message == WM_KEYDOWN) !ywc).]e  
 { #SmWF|/  
  if(pMsg -> wParam == VK_ESCAPE) |SmN.*&(9  
   return TRUE; U;/ )V  
  if(pMsg -> wParam == VK_RETURN) /r6DPR0\  
   return TRUE; D.~t#a A  
 } *W  l{2&  
 return CDialog::PreTranslateMessage(pMsg); Pa*yo:U'h  
} `y(3:##p  
n1|%xQBU@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kW9STN  
{ bYfcn]N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B(5g&+{Lq~  
  SaveBmp(); h2nyP  
  return FALSE; |qD<h  
} s.U p<Rw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o/xE O=AW  
 CMenu pop; pI4<` K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); V& m\  
 CMenu*pMenu=pop.GetSubMenu(0); j!l(ReGb  
 pMenu->SetDefaultItem(ID_EXITICON); L[^e< I  
 CPoint pt; *4bV8T>0Z  
 GetCursorPos(&pt); *!/9?M{p  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ScD9Ct*):C  
 if(id==ID_EXITICON) n9%rjS$  
  DeleteIcon(); -Y6JU  
 else if(id==ID_EXIT) ,yoT3_%P  
  OnCancel(); 1,E/So   
 return FALSE; x8^Dhpr6  
} 9bB~r[k  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &}oDSD H^,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sgX~4W"J  
 AddIcon(); N78Ev7PN  
 return res; Tr8+E;;  
} F=#Wfl-o  
bF.Aj8ZQ  
void CCaptureDlg::AddIcon() qr*/}F6  
{ C,E 5/XW  
 NOTIFYICONDATA data; AG?oA328  
 data.cbSize=sizeof(NOTIFYICONDATA); 31}6dg8?n  
 CString tip; _Cxs"to  
 tip.LoadString(IDS_ICONTIP); *QLbrR  
 data.hIcon=GetIcon(0); q^s$4q  
 data.hWnd=GetSafeHwnd(); Ugn"w E  
 strcpy(data.szTip,tip); nsPM`dz/  
 data.uCallbackMessage=IDM_SHELL; {_Y\Y&#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  : 2?du  
 data.uID=98; c~V\,lcI  
 Shell_NotifyIcon(NIM_ADD,&data); ??F{Gli"C`  
 ShowWindow(SW_HIDE); #KIHq2:.4  
 bTray=TRUE; `c icjA@~  
} b#b#r  
b% F|V G  
void CCaptureDlg::DeleteIcon() 5 Z@Q ^  
{ !@Ox%vK  
 NOTIFYICONDATA data; T|u)5ww%  
 data.cbSize=sizeof(NOTIFYICONDATA); {0|^F!1z  
 data.hWnd=GetSafeHwnd(); w/&#UsEIr  
 data.uID=98; +mY(6|1  
 Shell_NotifyIcon(NIM_DELETE,&data); p(Sfw>t(  
 ShowWindow(SW_SHOW); lr1i DwZV  
 SetForegroundWindow(); [W2k#-%G  
 ShowWindow(SW_SHOWNORMAL); UwLa9Dn^  
 bTray=FALSE; ;3w W)gL1  
} yk=H@`~!  
/q=<OEC  
void CCaptureDlg::OnChange() 6|zA,-=  
{ 0P|WoC X  
 RegisterHotkey(); d-Sm<XHu.  
} j8lbn|.  
js{ RaR=  
BOOL CCaptureDlg::RegisterHotkey() ]!/1qF  
{ (qaY,>je]D  
 UpdateData(); wm}i+ApK  
 UCHAR mask=0; A >e%rx  
 UCHAR key=0; 4 1Ru@  
 if(m_bControl) N-^\e)ln  
  mask|=4; qZ4DO*%b3  
 if(m_bAlt) %l>^q`p  
  mask|=2; D~-Ri`k.  
 if(m_bShift) P63f0 F-G  
  mask|=1; O@l`D`  
  key=Key_Table[m_Key.GetCurSel()]; Z@1rs#  
 if(bRegistered){ 3+)i23[4=\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  z=!xN5  
  bRegistered=FALSE; (*|hlD~  
 } k @[Bx>  
 cMask=mask; :wIbKs.r  
 cKey=key; mF "ctxE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;&iQNXL  
 return bRegistered; RsE+\)  
} y'(;!5w  
K\uR=L7  
  四、小结 FsD}N k=m~  
lOVsp#  
  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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