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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: 1 =?pL$+G  
  P,S!Z&!  
  一、实现方法 6jr}l  
"7 alpjwb  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: /L,iF?7  
fpNq  
#pragma data_seg("shareddata") BI2'NN\  
HHOOK hHook =NULL; //钩子句柄 :^7_E&  
UINT nHookCount =0; //挂接的程序数目 CNiJuj`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I-s$U T[p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,vi6<C\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )$Fw<;4  
static int KeyCount =0; _58&^:/^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8QFRX'i  
#pragma data_seg() ~O;?;@  
wj$3 L3  
  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。 vO{[P# L}  
#6AcM"  
  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: H_JT"~_2  
0} \;R5a<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR blV'-Al  
cKey,UCHAR cMask) TGPdi5Eq  
{ IOUzj{G#  
 BOOL bAdded=FALSE; +/*A}!#v  
 for(int index=0;index<MAX_KEY;index++){ $>~4RXC  
  if(hCallWnd[index]==0){ b#e|#!Je  
   hCallWnd[index]=hWnd; 6l?KX  
   HotKey[index]=cKey; o AS 'Z|  
   HotKeyMask[index]=cMask; tIX|oWC$q  
   bAdded=TRUE; xJzO?a'  
   KeyCount++; ~o ;*{ Q  
   break; 5[qx5|O  
  } ]s_BOt  
 } VN4H+9E  
 return bAdded; f#vVk  
} 0.Nik^~  
//删除热键 A^7Y%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }WkR-5N  
{ V,9UOC,Gn  
 BOOL bRemoved=FALSE; @6DV?VL  
 for(int index=0;index<MAX_KEY;index++){ CI?M2\<g  
  if(hCallWnd[index]==hWnd){ v/Ei0}e6~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ } SA/,4/9  
    hCallWnd[index]=NULL; 0SLn0vD!  
    HotKey[index]=0; s2+s1%^Ll  
    HotKeyMask[index]=0; Yg7C"3;Vt  
    bRemoved=TRUE; U@?Ro enn  
    KeyCount--; t5za$kW'&  
    break; PAXdIh[]  
   } ;,]Wtmu)7  
  } {Uu|NA87Cd  
 } F0FF:><  
 return bRemoved; )![? JXf  
} AUAJMS!m  
bc|DC,n?  
G_x<2E"d  
  DLL中的钩子函数如下: !n/"39KT  
9a9{OJa6M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pEE.%U  
{ Ol]+l]  
 BOOL bProcessed=FALSE; :AB$d~${M>  
 if(HC_ACTION==nCode) f?A*g$v  
 { ) >SU J^u  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Lm}:`  
   switch(wParam) H6XlSj  
   {  EWg\\90  
    case VK_MENU: It@.U|  
     MaskBits&=~ALTBIT; (-(sBQa+  
     break; 3Ga! )  
    case VK_CONTROL: q>*+.~  
     MaskBits&=~CTRLBIT; qG%'Lt  
     break; ^J]~&.l  
    case VK_SHIFT: 50.cMms  
     MaskBits&=~SHIFTBIT; /K9Tn  
     break; qJN2\e2~f  
    default: //judge the key and send message Q=%1@ ,x"  
     break; ]?`t spm<t  
   } Vn6g(:\w  
   for(int index=0;index<MAX_KEY;index++){ /t083  
    if(hCallWnd[index]==NULL) s^b2H !~  
     continue; ayJKt03\O\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y#Ao6Od6  
    { ~% QVjzMC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /JfRy%31  
     bProcessed=TRUE; 0BM3:]=wr  
    } 7N / v  
   } h$FpH\-  
  } :U>o;  
  else if((lParam&0xc000ffff)==1){ //有键按下 mh"&KX86W  
   switch(wParam) nxP>IfSA  
   { uFIr.U$V  
    case VK_MENU: d3AOuVUf  
     MaskBits|=ALTBIT; $e7dE$eH  
     break; 8-c1q*q)  
    case VK_CONTROL: PG8|w[V1"  
     MaskBits|=CTRLBIT; 3EN?{T<yf  
     break; `)FSJV1  
    case VK_SHIFT: |>(;gr/5(  
     MaskBits|=SHIFTBIT; :;S]jNy}j)  
     break; F`;oe[wfk  
    default: //judge the key and send message iXt >!f*  
     break; C&b^TLe  
   } ON|Bpt2Qp  
   for(int index=0;index<MAX_KEY;index++){ vlAYKtl3]  
    if(hCallWnd[index]==NULL) QXnL(z  
     continue; `w1|(Sk$h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x8xSA*@k  
    { xioL6^(Qk,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mr]IxTv  
     bProcessed=TRUE; f\FubL  
    } 00 Qn1  
   } sG`:mc~0   
  } )>$@cH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4i>sOP3 B  
   for(int index=0;index<MAX_KEY;index++){ j'#M'W3@  
    if(hCallWnd[index]==NULL) | -l)$i@  
     continue; pJ7M.C!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `VT[YhO#}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #;?j]npg]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?+)O4?#  
   } sBGYgBu!a  
  } I6d4<#Q@L  
 } M}E0Msq_o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (5y+g?9d;  
} n$n)!XL/  
Zb<IZ)i#1  
  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: [hE0 9W  
Z?yMy zT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x}t,v.:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iO)FZ%?"  
8C1 'g7A<  
  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: 1Uzsw  
^sR]w]cz.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]RgLTqv4x  
{ Sq"O<FmI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Fdsaf[3[v  
 { spIkXEK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 V3 j1M?>  
  SaveBmp(); :=qblc  
  return FALSE; jU\vg;nr  
 } v o vc,4}  
 …… //其它处理及默认处理 w8$rt  
} \8v{9Yb  
UruD&=AMK  
8zv=@`4@G  
  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。 H4[];&]xr  
GRV#f06  
  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。 egcJ@Of  
$89hkUuTu^  
  二、编程步骤 ? +{=>{1  
oxkA+}^j8M  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; TX7B(JZD  
Q>qx? g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "/ G^+u  
f>$Ld1  
  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; &?\'Z~B4  
$FV!HD  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; rO8Q||@>A  
WVaIC$Y  
  5、 添加代码,编译运行程序。 ^+Ho#]  
}1<_  
三、程序代码 e!cZW.B=`f  
P e_mX*0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ub^v ,S8O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ="fq.Tt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o(iv=(o  
#if _MSC_VER > 1000 @.T w*t  
#pragma once n^O Wz4  
#endif // _MSC_VER > 1000 Gt{'` P,&9  
#ifndef __AFXWIN_H__ !Gwf"-TQ  
#error include 'stdafx.h' before including this file for PCH 1]eh0H  
#endif pyPS5vWG  
#include "resource.h" // main symbols 56!>}!8!  
class CHookApp : public CWinApp BzFD_A>j;_  
{ sDV*k4  
 public: 7/*a  
  CHookApp(); _ PC}`Y'&  
  // Overrides `? ayc/TK  
  // ClassWizard generated virtual function overrides { bjK(|  
  //{{AFX_VIRTUAL(CHookApp) zPwU'TbF  
 public: q7id?F}3&  
  virtual BOOL InitInstance(); q3.L6M  
  virtual int ExitInstance(); A/kRw'6  
  //}}AFX_VIRTUAL o* q F"xG  
  //{{AFX_MSG(CHookApp) z?C;z7eT  
  // NOTE - the ClassWizard will add and remove member functions here. BaSNr6 YW  
  // DO NOT EDIT what you see in these blocks of generated code ! J:M)gh~#  
  //}}AFX_MSG :v/6k  
  DECLARE_MESSAGE_MAP() >pa tv  
}; mi~ BdBv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;bJ2miO"e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S30@|@fTz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2Z]<MiAxD  
BOOL InitHotkey(); Y~=]RCg  
BOOL UnInit(); mPR(4Ol.  
#endif USVM' ~p I  
~;/\l=Xl  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'TPRGX~&  
#include "stdafx.h" "Fv6u]Rv  
#include "hook.h" ;]<{ <czc  
#include <windowsx.h> h-VpX6  
#ifdef _DEBUG 5- Q`v/w;  
#define new DEBUG_NEW .ON+ ( #n  
#undef THIS_FILE -la~p~8  
static char THIS_FILE[] = __FILE__; 0 `X%&  
#endif Ov{fO  
#define MAX_KEY 100 ? C2 bA5 M  
#define CTRLBIT 0x04 _q([k_4h  
#define ALTBIT 0x02 Y =3:Q%X  
#define SHIFTBIT 0x01 CL(,Q8yG  
#pragma data_seg("shareddata") \mZ\1wzn'{  
HHOOK hHook =NULL; A%u@xL,_  
UINT nHookCount =0; X-di^%<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  U4#[>*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }z&P^p)R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey NEQcEUd?  
static int KeyCount =0; nbYkr*: "t  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U5mec167  
#pragma data_seg() C]UBu-]#S  
HINSTANCE hins; ?MhRdY  
void VerifyWindow(); 1Oo^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l79jd%/m  
//{{AFX_MSG_MAP(CHookApp) "r0z( j  
// NOTE - the ClassWizard will add and remove mapping macros here. V|NWJ7   
// DO NOT EDIT what you see in these blocks of generated code! F2y M2Ldx  
//}}AFX_MSG_MAP {jzN  
END_MESSAGE_MAP() =$5[uI2  
r @~T}<I  
CHookApp::CHookApp() X|L8s$>  
{ 8xmw-s)  
 // TODO: add construction code here, R~b9)  
 // Place all significant initialization in InitInstance %5RYa<oP  
} xiU-}H'o  
uMF\3T(x4  
CHookApp theApp; 1G|Q~%cv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (7 Mn%Jp  
{ qce#  
 BOOL bProcessed=FALSE; <C6/R]x#  
 if(HC_ACTION==nCode) u*Oz1~  
 { ^e8R 43w:!  
  if((lParam&0xc0000000)==0xc0000000){// Key up }M/w 0U0o  
   switch(wParam) ;-=y}DK  
   { 5S7`gN.  
    case VK_MENU: ,?B.+4CW\E  
     MaskBits&=~ALTBIT; 7V0:^Jov  
     break; )F? 57eh  
    case VK_CONTROL: uGl0z79  
     MaskBits&=~CTRLBIT; z/fRd6|[  
     break; [ H>MeeR  
    case VK_SHIFT: XoSjYG(>,  
     MaskBits&=~SHIFTBIT; ~N[hY1}X[  
     break; g)$Pvfc  
    default: //judge the key and send message EyNI]XEj  
     break; ^yK94U;<Gy  
   } g8XGZW!  
   for(int index=0;index<MAX_KEY;index++){ B<1*p,z  
    if(hCallWnd[index]==NULL) -f9M*7O<gf  
     continue; CR934TE+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ErESk"2t  
    { =La}^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d@At-Z~M  
     bProcessed=TRUE; 1>%SSQ  
    } *, *"G?  
   } CI{]o&Tf  
  } -(cm  
  else if((lParam&0xc000ffff)==1){ //Key down --.j&w  
   switch(wParam) 9^a>U(,  
   { 7v,>sX  
    case VK_MENU: puqLXDjA/  
     MaskBits|=ALTBIT; sF+0v p  
     break; Qlb@Az  
    case VK_CONTROL: a+{g~/z;,Q  
     MaskBits|=CTRLBIT; Y sr{1!K  
     break; %4 SREq  
    case VK_SHIFT: tB_V%qH  
     MaskBits|=SHIFTBIT; uTl:u  
     break; 2jhVmK  
    default: //judge the key and send message cJA :vHyw  
     break; J~_p2TZJ\3  
   } fykN\b  
   for(int index=0;index<MAX_KEY;index++) ,6M-xSDs  
   { ='VIbE@qC  
    if(hCallWnd[index]==NULL) *0c }`|  
     continue; 5)nv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) awkVjyqX  
    { c<D Yk f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h5f>'l z  
     bProcessed=TRUE; 7_K(x mK  
    } nZ bg  
   } 5z]dA~;*2  
  } $AXz/fGV  
  if(!bProcessed){ zr[~wM  
   for(int index=0;index<MAX_KEY;index++){ Bw_Ih|y,w  
    if(hCallWnd[index]==NULL) 25ayYO%PTc  
     continue; rmabm\QY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %'=oMbi>i4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Qy70/on9  
   } VuPET  
  } RChY+3,L)  
 } J,D{dYLDD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9~; Ju^b  
} _yoG<qI  
eXOFAd]>u  
BOOL InitHotkey() GDcV1$NA  
{ bv+e'$U3  
 if(hHook!=NULL){ I L\mFjZ'  
  nHookCount++; SRD&Uf0M  
  return TRUE; XBY"7}  
 } e{} o:r  
 else c|.:J]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }2 r08,m  
  if(hHook!=NULL) rL s6MY  
   nHookCount++; A;|DQR()  
  return (hHook!=NULL); E, v1F!  
} gU~)(|Nu.  
BOOL UnInit() UF%5/SiVX  
{  ~Afs  
 if(nHookCount>1){ nB]Q^~jX  
  nHookCount--; B.G!7>=  
  return TRUE; -24.[E/5  
 } # R&[+1=9j  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QVH_B+ Q  
 if(unhooked==TRUE){ !K 9(OX2;  
  nHookCount=0; M/DTD98'N  
  hHook=NULL; ^0&] .m  
 } MYPcH\K$h  
 return unhooked; sWC"^ So  
} -Fdi,\e  
RnrM rOh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G;m"ao"2  
{ V[mQ;:=  
 BOOL bAdded=FALSE; OKqpc;y:D  
 for(int index=0;index<MAX_KEY;index++){ bS'r}  
  if(hCallWnd[index]==0){ 5oKc=iX_3  
   hCallWnd[index]=hWnd; GWVdNYpmr  
   HotKey[index]=cKey; aOHCr>po,  
   HotKeyMask[index]=cMask; nKO&ffb'<  
   bAdded=TRUE; 16>uD;G  
   KeyCount++; K7.<,E"M.  
   break; +i^s\c!3;  
  } 'O`3FI  
 } }j?S?=;m=  
 return bAdded; :#/bA&  
} /wTf&_"mTL  
c6HU'%v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *lK4yI*%o  
{ 3+-(;>>\  
 BOOL bRemoved=FALSE; ]~^/w}(K  
 for(int index=0;index<MAX_KEY;index++){ *r`Yz}  
  if(hCallWnd[index]==hWnd){ {K:Utdu($q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Fsf22  
    hCallWnd[index]=NULL; #:|Y(,c  
    HotKey[index]=0; ? iX=2-  
    HotKeyMask[index]=0; #%9]Lq  
    bRemoved=TRUE; i6d$/ yP"  
    KeyCount--; m-89nOls  
    break; tFaE cP  
   } #Qr4Ke$g[l  
  } a<wZv-\Vau  
 } 9i}D6te  
 return bRemoved; m0Syxb  
} LJwMM  
t^,Qy.L0  
void VerifyWindow() Pm^N0L9?q  
{ xLI{=sL  
 for(int i=0;i<MAX_KEY;i++){ 5|CiwQg|,p  
  if(hCallWnd!=NULL){  <%D"eD  
   if(!IsWindow(hCallWnd)){ Sx)Il~ x  
    hCallWnd=NULL; ;q; C ^l  
    HotKey=0; ;p 5v3<PC  
    HotKeyMask=0; !>< %\K  
    KeyCount--; 8 tygs  
   } 7f%Qc %B  
  } ocqB-C]  
 } 5\0.[W{^  
} +.]}f}Y  
IZ0$=aB7  
BOOL CHookApp::InitInstance() /iy*3P,`  
{ YC&jKx.>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AC:s4iacC  
 hins=AfxGetInstanceHandle();  6b]d|  
 InitHotkey(); iM|"H..  
 return CWinApp::InitInstance(); 0BB @E(*  
} $xtE+EV.p  
'e>sHL  
int CHookApp::ExitInstance() i!W8Q$V  
{ s#4ew}  
 VerifyWindow(); zQ5jx5B":  
 UnInit(); 1O2h9I$bk  
 return CWinApp::ExitInstance(); };m7FO  
} mvA xx`jc  
tOM3Gs~o6z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Sq|1f?_gU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bEQtVe@`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DV[ Jbl:)  
#if _MSC_VER > 1000 q 9brpbg_  
#pragma once 8gtCY~m  
#endif // _MSC_VER > 1000 X c2B2c  
+ %#MrNM'  
class CCaptureDlg : public CDialog k<'vP{  
{ ^?X ^+  
 // Construction ah/6;,T  
 public: *[xNp[4EU  
  BOOL bTray; [ lzy &To  
  BOOL bRegistered; " T a9  
  BOOL RegisterHotkey(); V1`5D7Z  
  UCHAR cKey; P"=UI$HN  
  UCHAR cMask; KBr5bcm4u  
  void DeleteIcon(); LA+$_U"Jk  
  void AddIcon(); *mQDS.'AB@  
  UINT nCount; Y!a+#N!  
  void SaveBmp(); \buZ?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor tT* W5  
  // Dialog Data XJJ[F|k~  
  //{{AFX_DATA(CCaptureDlg) => uVp  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8XYD L] I'  
  CComboBox m_Key; Y-%l7GErhL  
  BOOL m_bControl; V8nz-DL{  
  BOOL m_bAlt; sw$R2K{y  
  BOOL m_bShift; Ql q#Zdru  
  CString m_Path; V|3yZ8lE  
  CString m_Number; miG; ]-"^  
  //}}AFX_DATA T+K` ^xv_L  
  // ClassWizard generated virtual function overrides Pu$kj"|q*[  
  //{{AFX_VIRTUAL(CCaptureDlg) Krp <bK6  
 public: o0aO0Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); wsf Hd<Z_  
 protected: qD(fYOX{C  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S om. qD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C,|nmlDN  
  //}}AFX_VIRTUAL C`NBHRa>  
  // Implementation s<Ex"+  
 protected: ReI=4Jq11  
  HICON m_hIcon; agU%z:M{  
  // Generated message map functions N"YK@)*Q  
  //{{AFX_MSG(CCaptureDlg) n&0mz1rw  
  virtual BOOL OnInitDialog(); T .Pklty  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); DMAf^.,S  
  afx_msg void OnPaint(); U^[cYTG  
  afx_msg HCURSOR OnQueryDragIcon(); a%Z4_ToLZ  
  virtual void OnCancel(); IS,zy+w  
  afx_msg void OnAbout(); DnNt@e2|  
  afx_msg void OnBrowse(); j}rgO z.  
  afx_msg void OnChange(); 1N!Oslum  
 //}}AFX_MSG 4;BW  
 DECLARE_MESSAGE_MAP() $@[dm)M  
}; .Bb$j=  
#endif .N5h V3  
s6uF5]M;2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )|U_Z"0H^  
#include "stdafx.h" c y=I0  
#include "Capture.h" KjFZ  
#include "CaptureDlg.h" ig{A[7qN  
#include <windowsx.h> iUeV5cB  
#pragma comment(lib,"hook.lib") qs6Nb'JvQR  
#ifdef _DEBUG ,] ~u:Y}  
#define new DEBUG_NEW bGZ hUEq  
#undef THIS_FILE C1X}3bB  
static char THIS_FILE[] = __FILE__; d98))G~W  
#endif r/mA2  
#define IDM_SHELL WM_USER+1 a&$Zpf!!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =@xN(] (  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z>cIiprX  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F^.om2V|9  
class CAboutDlg : public CDialog ki;!WhF~  
{ B;xZ% M]  
 public: iEiu%T>  
  CAboutDlg(); M|/oFV  
  // Dialog Data c=b+g+*xd  
  //{{AFX_DATA(CAboutDlg) rQ`\JE&`  
  enum { IDD = IDD_ABOUTBOX }; c@RT$Q9j  
  //}}AFX_DATA opm?':Qst  
  // ClassWizard generated virtual function overrides 4 t&gW  
  //{{AFX_VIRTUAL(CAboutDlg) 7))y}N:p  
 protected: ;\<""Yj@l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \p5|}<Sr)  
  //}}AFX_VIRTUAL ~hS3*\^~M  
  // Implementation ;Ay >+M2O  
 protected: ~ A^E  
  //{{AFX_MSG(CAboutDlg) G;2R]H#p  
  //}}AFX_MSG -Nsk}Rnk*  
  DECLARE_MESSAGE_MAP() 44\!PYf7  
}; 6N9 c<JC  
b->eg 8|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1pd 9s8CA  
{ ooTc/QEYi  
 //{{AFX_DATA_INIT(CAboutDlg) #,@bxsB  
 //}}AFX_DATA_INIT tl DY k  
} <_"B}c/2$  
Gx.P ]O3  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O4m(Er@a  
{ A5sf  
 CDialog::DoDataExchange(pDX); 9wAA. -"  
 //{{AFX_DATA_MAP(CAboutDlg) 9.xvV|Sp  
 //}}AFX_DATA_MAP Z8&4z.6_  
} WHp97S'd  
LMAmpVo  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4F}Pu<;  
 //{{AFX_MSG_MAP(CAboutDlg) (V$Zc0  
 // No message handlers 9 0X?1  
 //}}AFX_MSG_MAP HwB {8S?sm  
END_MESSAGE_MAP() 6tOCZ'f  
Dq?E\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fZ[kh{|  
: CDialog(CCaptureDlg::IDD, pParent) y&1%1 #8F  
{ uCw>}3  
 //{{AFX_DATA_INIT(CCaptureDlg) RG&I\DTyt  
  m_bControl = FALSE; }-d)ms!  
  m_bAlt = FALSE; EbCIIMbe"  
  m_bShift = FALSE; K'x4l,rq  
  m_Path = _T("c:\\"); `q%U{IR  
  m_Number = _T("0 picture captured."); y|^EGnaE  
  nCount=0; 8s<^]sFP  
  bRegistered=FALSE; Ks#A<! ;=  
  bTray=FALSE; zm3-C%:Bw  
 //}}AFX_DATA_INIT /$;,F't#2M  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #S%4?   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :d.1;st  
} <O.Kqk* nq  
doBNghS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ski G2n]  
{ 0|ZVA+  
 CDialog::DoDataExchange(pDX); {{32jU7<  
 //{{AFX_DATA_MAP(CCaptureDlg) H#+\nT2m  
  DDX_Control(pDX, IDC_KEY, m_Key); jk )Vb  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3S5^ `Ag#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZI,j?i6\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); y`4{!CEyLW  
  DDX_Text(pDX, IDC_PATH, m_Path); "l TZ|k^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'qjX$]H  
 //}}AFX_DATA_MAP 'fIHUw|  
} j?xk&  
Y=E9zUF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Rv,82iEKs  
//{{AFX_MSG_MAP(CCaptureDlg) qYK4)JP  
 ON_WM_SYSCOMMAND() k=?^){[We  
 ON_WM_PAINT() Jn=42Q:>  
 ON_WM_QUERYDRAGICON() mwIk^Sz]@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) T tPr)F|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #: #Dz.$L  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6a*83G,k  
//}}AFX_MSG_MAP RwW$O@0  
END_MESSAGE_MAP() J@QdieW6  
vs +QbI6>-  
BOOL CCaptureDlg::OnInitDialog() UgC)7 K1  
{ oCVku:.  
 CDialog::OnInitDialog(); OqBC/p B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p;0 PxL=  
 ASSERT(IDM_ABOUTBOX < 0xF000); I+|uU g5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]KWK}Zyi  
 if (pSysMenu != NULL) /Pk:4,  
 { C`NmZwL  
  CString strAboutMenu; =p q:m  
  strAboutMenu.LoadString(IDS_ABOUTBOX); DVh)w}v  
  if (!strAboutMenu.IsEmpty()) <4c%Q)  
  { `a >?UUT4  
   pSysMenu->AppendMenu(MF_SEPARATOR); +%XnMl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]boE{R!I  
  } ePEe?o4;  
 } :m K xa  
 SetIcon(m_hIcon, TRUE); // Set big icon Me,<\rQ  
 SetIcon(m_hIcon, FALSE); // Set small icon !MoOKW  
 m_Key.SetCurSel(0); T`\]!>eb  
 RegisterHotkey(); L+.H z&*@  
 CMenu* pMenu=GetSystemMenu(FALSE); M\9F:.t=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); cvfUyp;P  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); IE;\7 r+h  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $3k "WlRG  
 return TRUE; // return TRUE unless you set the focus to a control n(>C'<otj  
} &RW`W)0;  
j0x5@1`6G  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ZVL gK}s  
{ 9 Kbw GmSU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) PO o%^'(  
 { tuxRVV8l  
  CAboutDlg dlgAbout; HTk\723Rdw  
  dlgAbout.DoModal(); ARF\fF|<2  
 } X?/Lz;,&  
 else Jf_%<\ O  
 { Ie@Jb{ x  
  CDialog::OnSysCommand(nID, lParam); JoJukoy}F  
 } mI"D(bx\  
} G;s"h%Xw98  
0Z HDBh  
void CCaptureDlg::OnPaint() ?:igumeYX  
{ gn)R^  
 if (IsIconic()) dZ]Rqr _!  
 { |4mVT&63(  
  CPaintDC dc(this); // device context for painting TH4\HY9qa?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /t5p-  
  // Center icon in client rectangle 4h8*mMghs  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2*2:-o cl$  
  int cyIcon = GetSystemMetrics(SM_CYICON); #jA)>z\Q^  
  CRect rect; {@.Vh]  
  GetClientRect(&rect); e |V]  
  int x = (rect.Width() - cxIcon + 1) / 2; cWa)#:JOV  
  int y = (rect.Height() - cyIcon + 1) / 2; +,5-qm)Gh>  
  // Draw the icon 6B6vP%H#  
  dc.DrawIcon(x, y, m_hIcon); 0.Vi9 7`  
 } 5 1dSFr<#  
 else & mt)d  
 { 4W;S=#1  
  CDialog::OnPaint(); <f>akT,W  
 } ;Vu5p#,O<M  
} Vrkf(E3_V  
4kl Ao$  
HCURSOR CCaptureDlg::OnQueryDragIcon() )9L/sKz  
{ %j+xgX/&  
 return (HCURSOR) m_hIcon; wtH~-xSB|  
} qCPmbg  
nxo+?:**  
void CCaptureDlg::OnCancel() )uheV,ZnY  
{ x#H 3=YD*  
 if(bTray) ynwG\V  
  DeleteIcon(); 'V&Y[7Aeq  
  CDialog::OnCancel(); V/%~F6e  
} Vba.uKNjk  
dl~|Izm  
void CCaptureDlg::OnAbout() {38bv. 3'  
{  QLKK.]  
 CAboutDlg dlg; YY5!_k  
 dlg.DoModal(); DAO]uh{6  
} z-T{~{q  
bPbb\|u0d  
void CCaptureDlg::OnBrowse() fV\]L4%  
{ BS 1Ap  
 CString str; $E!J:Y=  
 BROWSEINFO bi; ,,4 GNbBC  
 char name[MAX_PATH]; gVR@&bi7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,5Vt]#F5@  
 bi.hwndOwner=GetSafeHwnd(); ec3<%+0f  
 bi.pszDisplayName=name; 9jir* UI  
 bi.lpszTitle="Select folder"; OF U/gaO~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 98XVa\|tl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L=; -x9  
 if(idl==NULL) s>n(`?@L  
  return; /~p+j{0L3W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mN_Z7n;^eh  
 str.ReleaseBuffer(); E%N2k|%8d_  
 m_Path=str; o4y']JSN  
 if(str.GetAt(str.GetLength()-1)!='\\') d^E [|w ;  
  m_Path+="\\"; GX{XdJD  
 UpdateData(FALSE); Fr2N[\>s  
} x2Lq=zwJ  
&HZmQ>!R D  
void CCaptureDlg::SaveBmp() XzIx:J6  
{ }f}}A=  
 CDC dc; 9LC&6Q5O&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); , E )|y4  
 CBitmap bm; ?#A]{l  
 int Width=GetSystemMetrics(SM_CXSCREEN); _HOIT  
 int Height=GetSystemMetrics(SM_CYSCREEN);  AnBJ(h  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8jlLUG:g  
 CDC tdc; ~nLN`H d  
 tdc.CreateCompatibleDC(&dc); /b#l^x:j  
 CBitmap*pOld=tdc.SelectObject(&bm); q!~ -(&S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); s"KJiQKGM  
 tdc.SelectObject(pOld); q'[}9e`Q  
 BITMAP btm; T#@lDpO  
 bm.GetBitmap(&btm); I{'f|+1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }n:?7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qy1F* kY  
 BITMAPINFOHEADER bih; CT a#Q,  
 bih.biBitCount=btm.bmBitsPixel; Elj_,z  
 bih.biClrImportant=0; Fh|#u:n  
 bih.biClrUsed=0; [(kB 5 a  
 bih.biCompression=0; u^Ku;RQo  
 bih.biHeight=btm.bmHeight; PQmq5N6  
 bih.biPlanes=1; X!hIwiA,t  
 bih.biSize=sizeof(BITMAPINFOHEADER); BimjQ;jtI  
 bih.biSizeImage=size; ? 8aaD>OR$  
 bih.biWidth=btm.bmWidth; m><w0k?t  
 bih.biXPelsPerMeter=0; "^j>tii  
 bih.biYPelsPerMeter=0; Yj|eji7y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /&#XhrT  
 static int filecount=0; sb_oD{+gW  
 CString name; M,5j5<7  
 name.Format("pict%04d.bmp",filecount++); C;+(Zp  
 name=m_Path+name; Jq.lT(E8D  
 BITMAPFILEHEADER bfh; f"u *D,/sS  
 bfh.bfReserved1=bfh.bfReserved2=0; 8M,9kXq{L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); n%^ LPD  
 bfh.bfSize=54+size; Z7rJ}VP  
 bfh.bfOffBits=54; mMx ;yZ  
 CFile bf; g>0XxjP4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ O`Gs S{$sS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?^mi3VM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h}_~y'^!  
  bf.WriteHuge(lpData,size); 0kQPJWF  
  bf.Close(); b i y4 d  
  nCount++; 5RH2"*8T  
 } qW:)!z3\  
 GlobalFreePtr(lpData); _-!sBK+F  
 if(nCount==1) |s#'dS;  
  m_Number.Format("%d picture captured.",nCount); anw}w !@U  
 else .o1^Oh  
  m_Number.Format("%d pictures captured.",nCount);  XY.5Rno4  
  UpdateData(FALSE); W!blAkM%i  
} w@-PqsF  
87)zCq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,t{,_uPJY  
{ $8USyGi3J  
 if(pMsg -> message == WM_KEYDOWN) _I`,Br:N  
 { P7ph}mB  
  if(pMsg -> wParam == VK_ESCAPE) X8dR+xd  
   return TRUE; l+V,DCE  
  if(pMsg -> wParam == VK_RETURN) s](aNe2j  
   return TRUE; cfox7FmW  
 } oRKEJ Nps  
 return CDialog::PreTranslateMessage(pMsg); jV#ahNq;  
} `nKH"TaX  
fP tm0.r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IKMeJ(:S  
{ ,uw132<b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ri`R<l8  
  SaveBmp(); B/5=]R  
  return FALSE; /( .6bv  
} E3@QI?n^^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [S.ZJUns  
 CMenu pop; }R3=fbe,\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4!asT;`'  
 CMenu*pMenu=pop.GetSubMenu(0); ,*4p?|A  
 pMenu->SetDefaultItem(ID_EXITICON); *`j-i  
 CPoint pt; 87 }&`  
 GetCursorPos(&pt); c`lJu_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); t E` cau  
 if(id==ID_EXITICON) ze_{=Cv&Y  
  DeleteIcon(); ,D\GGRw  
 else if(id==ID_EXIT) h2ZkCML  
  OnCancel(); #-3=o6DCK  
 return FALSE; U. AjYez  
} 22kpl)vbU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bifS 2>c  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) JKer//ng4  
 AddIcon(); j1SMeDDM ~  
 return res; c4_`Ew^k  
} Qn ^bVhG+  
=#mTfJ   
void CCaptureDlg::AddIcon() 8 #ndFpu  
{ T!wo2EzE  
 NOTIFYICONDATA data; mh<=[J,%p  
 data.cbSize=sizeof(NOTIFYICONDATA); :{NC-%4o0  
 CString tip; K:' q>D@  
 tip.LoadString(IDS_ICONTIP); ]$U xCu  
 data.hIcon=GetIcon(0); X7,PEA  
 data.hWnd=GetSafeHwnd(); o!:8nXw  
 strcpy(data.szTip,tip); yq+!czlZ  
 data.uCallbackMessage=IDM_SHELL; J5h+s-'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [D5t{[i  
 data.uID=98; tbnH,*  
 Shell_NotifyIcon(NIM_ADD,&data); 0!z@2[Pe66  
 ShowWindow(SW_HIDE); &z"krM]G  
 bTray=TRUE;  tpy>OT$  
} lpH=2l$>?  
SI:U0gUc  
void CCaptureDlg::DeleteIcon() \rykBxs  
{ E;21?`x5  
 NOTIFYICONDATA data; \5Vde%!$Z  
 data.cbSize=sizeof(NOTIFYICONDATA); I\qYkWg7  
 data.hWnd=GetSafeHwnd(); ++L?+^h  
 data.uID=98; 9Lh|DK,nV/  
 Shell_NotifyIcon(NIM_DELETE,&data); @"T"7c?Cv  
 ShowWindow(SW_SHOW); h7s; m  
 SetForegroundWindow(); e!fqXVEVR  
 ShowWindow(SW_SHOWNORMAL); )otb>w5  
 bTray=FALSE; UD~p'^.m_  
} 9dMrgz&'  
, @m@S ^  
void CCaptureDlg::OnChange() <o2r~E0r3  
{ <8UYhGK  
 RegisterHotkey(); jlFk@:y4  
} 10#oG{ 9  
yfU<UQ!1  
BOOL CCaptureDlg::RegisterHotkey() @|a>&~xX  
{ ?^:h\C^a"  
 UpdateData();  p0.|<  
 UCHAR mask=0; VL9-NfeqR  
 UCHAR key=0; LJX-AO.4  
 if(m_bControl) :Q+5,v-c  
  mask|=4; E&Qi@Ty  
 if(m_bAlt) 1Y_w5dU  
  mask|=2; A?TBtAe  
 if(m_bShift) Lp5U"6y  
  mask|=1; Gu=STb  
  key=Key_Table[m_Key.GetCurSel()]; E{HY!L[  
 if(bRegistered){ ? muzU.h"z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); B= keBO](@  
  bRegistered=FALSE; q_ =b<.;  
 } e6=]m#O9  
 cMask=mask; Y-ux7F{=z  
 cKey=key; +.RKi !  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R{,ooxH\J  
 return bRegistered; tweY'x.{  
} )'l*Tl  
A?G IBjs  
  四、小结 m~Ld~I"  
Z%Z9oJ:  
  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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