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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@ e22\  
  #s'UA!)  
  一、实现方法 B{#*PAK=  
,9(=Iu-?1  
  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: bJ[{[|yEd  
/~,|zz  
#pragma data_seg("shareddata") J?yNZK$WqN  
HHOOK hHook =NULL; //钩子句柄 (1 L9K;  
UINT nHookCount =0; //挂接的程序数目 4`x.d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *r b/BZX{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x6, #Jp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey B1EI'<S  
static int KeyCount =0; DrG9Kky{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Rmq8lU  
#pragma data_seg() q`l&G%  
$_j\b4]%  
  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。 qdlz#-B  
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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: .pP{;:Avpn  
?B)jnBh|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR AgOw{bJ%  
cKey,UCHAR cMask) duCso M/  
{ m+f?+c6  
 BOOL bAdded=FALSE; _K4Igq  
 for(int index=0;index<MAX_KEY;index++){ d)G' y  
  if(hCallWnd[index]==0){ JGJXV3AT  
   hCallWnd[index]=hWnd; =F(fum;zH  
   HotKey[index]=cKey; tWs ]Zd  
   HotKeyMask[index]=cMask; tD G[}j  
   bAdded=TRUE; 6#,VnS)`q  
   KeyCount++; 4CzT<cp  
   break; `}b#O}z)^  
  } m&GxL T6  
 } ,rvw E  
 return bAdded; S%h[e[[fST  
} >)/,5VSE  
//删除热键 Orb('Z,-3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2D5S%27,  
{ WUVRwJ 5  
 BOOL bRemoved=FALSE; 5h"moh9tG  
 for(int index=0;index<MAX_KEY;index++){ ZyJdz+L{@V  
  if(hCallWnd[index]==hWnd){ -Y*"!8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9t 3mU:  
    hCallWnd[index]=NULL; UStNUNCq  
    HotKey[index]=0; $6W o$c%  
    HotKeyMask[index]=0; o%!8t_1mR  
    bRemoved=TRUE; :# 1d;jx  
    KeyCount--; Jj<UtD+  
    break; QAp+LSm  
   } ?s4-2g  
  } [ n[!RddY  
 } 9?VyF'r=  
 return bRemoved; 3GH@|id  
} wVI 1sR  
=hs !t|(*  
mSn>  
  DLL中的钩子函数如下: `Qf$]Eoft  
"bO\Wt#Mf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y^7ol;t  
{ {Vc%ga|E  
 BOOL bProcessed=FALSE; C%s+o0b  
 if(HC_ACTION==nCode) uF xrv  
 { 0P(U^rkR~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /H_,1Fu|  
   switch(wParam) ~16QdwK  
   {  kC =e>v  
    case VK_MENU: orGNza"A  
     MaskBits&=~ALTBIT; < a g|#  
     break; M;BDo(1  
    case VK_CONTROL: NVEjUt/  
     MaskBits&=~CTRLBIT; +- ~:E_G  
     break; =B}a +0u!  
    case VK_SHIFT: #WBlEVx;Z  
     MaskBits&=~SHIFTBIT; 2OXcP!\Y  
     break; @a AR99M  
    default: //judge the key and send message #Y*?k TF  
     break; 41c]o<!=)j  
   } Dc,h( 2  
   for(int index=0;index<MAX_KEY;index++){ I~LN)hqdo  
    if(hCallWnd[index]==NULL) P@ gVzx)M  
     continue; 4!'1o`8vs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $T\W'W R>  
    { OnNWci|7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #~A(%a  
     bProcessed=TRUE; _j$"fg  
    } w2-:!,X  
   } tx$kD2  
  } tb^8jC  
  else if((lParam&0xc000ffff)==1){ //有键按下 o:H^ L,<Tl  
   switch(wParam) 9(;5!q,Gsg  
   { TO&ohATp  
    case VK_MENU: RlRkw+%m  
     MaskBits|=ALTBIT; ` ZO#n  
     break; \)\uAI-  
    case VK_CONTROL: ~H[  
     MaskBits|=CTRLBIT; rToZN!q\S  
     break; =T73660  
    case VK_SHIFT: N=1zhI:VaQ  
     MaskBits|=SHIFTBIT; i/ED_<_ Vg  
     break; {!? @u?M  
    default: //judge the key and send message l)V!0eW  
     break; R+'$V$g\X  
   } F`/-Q>Q  
   for(int index=0;index<MAX_KEY;index++){ lHRs3+  
    if(hCallWnd[index]==NULL) ]V|rOtxb  
     continue; |eN#9Bm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~r/"w'dB  
    { UKYQ @m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BMubN   
     bProcessed=TRUE; &h(>jY7b;  
    } 7Hghn"ol  
   } cT2&nZ  
  } qOA+ao  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M^q< qS>d  
   for(int index=0;index<MAX_KEY;index++){ +iS'$2)@  
    if(hCallWnd[index]==NULL) ;yfKYN[  
     continue; 9q +I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =mVWfFL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jZjWz1+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 L1'PQV  
   } 8fV.NCyE  
  } b3/@$x<  
 } xJG&vOf;?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); st- z>}  
} 9((BOq  
AcZ{B<  
  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: vY 0EffZ  
6Zr_W#SE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `IP?w&k)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _&(\>{pm  
o#"U8N%r  
  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: [Lck55V+Q  
/{)}y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :G.u{cw  
{ +8<|P&fH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /+V}.  
 { UL{+mp  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 OD@k9I[  
  SaveBmp(); pZE}<EX  
  return FALSE; *B4?(&0  
 } \ltbiDP2  
 …… //其它处理及默认处理 |IcA8[  
} 7 KuUV!\h`  
Zz,j,w0 Z  
_4#Mdnh}[  
  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。 ZVelKI8>  
JXx[e  
  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。 f|v5i tO2  
?|i C-7{8L  
  二、编程步骤 xK*G'3Ge  
<E2n 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"; D`Cy]j  
{6I)6}w!k  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,`pUz[wl  
n 3eLIA{  
  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; ~=P#7l\o1  
<r>1W~bp.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; \CU-a`n  
rSgOQ  
  5、 添加代码,编译运行程序。 N*1{yl76x  
&Z3u(Eb  
三、程序代码 =x xN3Ay  
MdC}!&W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ts:YJAu+F  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Jkx_5kk/\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ r"_U-w  
#if _MSC_VER > 1000 ^g'P H{68  
#pragma once 5i0vli /L  
#endif // _MSC_VER > 1000 ]/#3 P  
#ifndef __AFXWIN_H__ yI{4h $c  
#error include 'stdafx.h' before including this file for PCH XLgp.w;  
#endif N,3 )`Vm  
#include "resource.h" // main symbols DqJzsk'd3  
class CHookApp : public CWinApp "C]v   
{ c]/X >8;  
 public: B*@0l:  
  CHookApp(); S4Q fx6:~h  
  // Overrides UfkQG`G9H  
  // ClassWizard generated virtual function overrides Hk 0RT%PK  
  //{{AFX_VIRTUAL(CHookApp) {3* Ne /  
 public: r`\6+Ntb.  
  virtual BOOL InitInstance(); d)WGI RUx  
  virtual int ExitInstance(); D7lRZb  
  //}}AFX_VIRTUAL TWeup6k  
  //{{AFX_MSG(CHookApp) H5eGl|Z5]^  
  // NOTE - the ClassWizard will add and remove member functions here. H3xMoSs  
  // DO NOT EDIT what you see in these blocks of generated code ! u2E}DhV  
  //}}AFX_MSG  vWH)W?2  
  DECLARE_MESSAGE_MAP() W^,(we  
}; ,%T sfB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4[lym,8C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xk(p:^ R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YlC$L$%Zd.  
BOOL InitHotkey(); :^En\YcU  
BOOL UnInit(); X( )yhe_  
#endif 4T>d%Tt+)  
hnnVp_<]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jm`{MzqL  
#include "stdafx.h" $xqX[ocor  
#include "hook.h" Aa`R40yl  
#include <windowsx.h> M:*)l(  
#ifdef _DEBUG / tG[pg{[  
#define new DEBUG_NEW `yYYyB[  
#undef THIS_FILE gSk0#Jt  
static char THIS_FILE[] = __FILE__; zq'KX/o  
#endif h:=W`(n5u  
#define MAX_KEY 100 O~OM.:al&  
#define CTRLBIT 0x04 AsfmH-4)  
#define ALTBIT 0x02 ._[uSBR'  
#define SHIFTBIT 0x01 Zs|m_O G  
#pragma data_seg("shareddata") (:>Sh0.  
HHOOK hHook =NULL; B%I<6E[D  
UINT nHookCount =0; z7s}-w,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey veAdk9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Eh+m|A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [{q])P;  
static int KeyCount =0; zi_0*znw  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P r2WF~NuO  
#pragma data_seg() Ou]!@s  
HINSTANCE hins; Q"s]<MtdS  
void VerifyWindow(); S=a>rnF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \'6%Ld5km  
//{{AFX_MSG_MAP(CHookApp) b?j\YX[e  
// NOTE - the ClassWizard will add and remove mapping macros here. P]0/S  
// DO NOT EDIT what you see in these blocks of generated code! aeE~[m  
//}}AFX_MSG_MAP `hDH7u!U.  
END_MESSAGE_MAP() #2dH2k\F  
.k"unclT0  
CHookApp::CHookApp() 6(/*E=bOKV  
{ K*P:FCz  
 // TODO: add construction code here, fD*jzj7o ,  
 // Place all significant initialization in InitInstance &S=xSs:q.  
} gn:&akg  
/[I#3|  
CHookApp theApp; J%IKdxa  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0V+v)\4FE  
{ !8*7{7  
 BOOL bProcessed=FALSE; }_oQg_-7e  
 if(HC_ACTION==nCode) y[';@t7CC  
 { .1:B\ R((  
  if((lParam&0xc0000000)==0xc0000000){// Key up e3k58  
   switch(wParam) ;TL>{"z`x  
   { CsJ&,(s(  
    case VK_MENU: v(]dIH  
     MaskBits&=~ALTBIT; y`Zn{mQ@[  
     break; 98*C/=^TH{  
    case VK_CONTROL: 6lm<>#_  
     MaskBits&=~CTRLBIT; @2~;)*  
     break; M Al4g+es  
    case VK_SHIFT: Eih6?Lpu  
     MaskBits&=~SHIFTBIT; PU-L,]K  
     break; ! Q8y]9O  
    default: //judge the key and send message L5 wR4Ue)  
     break; P@0J!  
   } GK[9Cm"v  
   for(int index=0;index<MAX_KEY;index++){ pHKc9VC  
    if(hCallWnd[index]==NULL) OCu/w1 bc  
     continue; g f<vQb|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fLZ99?J  
    { D%= j@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >J_(~{-sNG  
     bProcessed=TRUE; 1cS*T>`  
    } S])*LUi  
   } t{e}3}LEd  
  } 6GoQJ  
  else if((lParam&0xc000ffff)==1){ //Key down 0py29>"t  
   switch(wParam) #kgLdd"  
   { 0lU pil  
    case VK_MENU: N_E)f  
     MaskBits|=ALTBIT; *-&+;|mM  
     break; L]E.TvM1*  
    case VK_CONTROL: F{E`MK~f_  
     MaskBits|=CTRLBIT; j9R+;u/!  
     break;  = Atyy  
    case VK_SHIFT: deOk>v&U  
     MaskBits|=SHIFTBIT; IM_SZs  
     break; M%OUkcWCk  
    default: //judge the key and send message _adW>-wQ!d  
     break; Y/f8rN  
   } $ncP#6  
   for(int index=0;index<MAX_KEY;index++) _FCg5F2U  
   { ~En]sj  
    if(hCallWnd[index]==NULL) MaZVGrcC  
     continue; hVNT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  Q!(qb  
    { lL,0IfC,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Fr#QM0--B  
     bProcessed=TRUE; 1sq1{|NW~  
    } n2Y a'YF  
   } N7!(4|14  
  } y m?uj4I{  
  if(!bProcessed){ drJUfsxV  
   for(int index=0;index<MAX_KEY;index++){ /}k?Tg/  
    if(hCallWnd[index]==NULL) )BZ6QO`5n  
     continue; w3M F62:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~&D5RfK5f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +&.39q !  
   } 2L S91  
  } G[]h1f!  
 } tlgg~MViS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @2sr/gX^  
} cRWYS[O?-  
Pu(kCH{  
BOOL InitHotkey() U:gvK 8n  
{ aZmac'cz{  
 if(hHook!=NULL){ Q zY5S0  
  nHookCount++; 2]Ei4%jo  
  return TRUE; $U'*}S  
 } <m*j1|^{t  
 else >6|Xvtf  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *JO%.QNg  
  if(hHook!=NULL) |eksvO'~  
   nHookCount++; 91UC>]}H  
  return (hHook!=NULL); HMw}pp:  
} w$aejz`[  
BOOL UnInit() lr=quWDY  
{ !Y*O0_  
 if(nHookCount>1){ 7!~)a  
  nHookCount--; u6 4{w,  
  return TRUE; p+CK+m   
 } P}vk5o'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ki(0s  
 if(unhooked==TRUE){ IO"q4(&;P4  
  nHookCount=0; yY!@FGsA  
  hHook=NULL; ZeH=]G4Zv7  
 } ^2nH6,LPS  
 return unhooked; @Py?.H   
} juMHc$d17  
"5"{~3Gw^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %F(lq*8X  
{ ?>mpUH  
 BOOL bAdded=FALSE; 4+Y9":<  
 for(int index=0;index<MAX_KEY;index++){ SKo*8r   
  if(hCallWnd[index]==0){  5s<.qDc  
   hCallWnd[index]=hWnd; N~DO_^  
   HotKey[index]=cKey; C\* 0621  
   HotKeyMask[index]=cMask; OKnpG*)u=g  
   bAdded=TRUE; 2 ;Q|h$ n  
   KeyCount++; jWK>=|)=c  
   break; 54Vb[;`Kkb  
  } n66b(6"mO2  
 } UW&K\P  
 return bAdded; ~I@ % ysR  
} ~sTn?~  
oot kf=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >iI_bcqF  
{ >[g.8'hI  
 BOOL bRemoved=FALSE; ,<;.'r  
 for(int index=0;index<MAX_KEY;index++){ {?X9juc/#  
  if(hCallWnd[index]==hWnd){ ew,g'$drD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _r`(P#Hy  
    hCallWnd[index]=NULL; dZ Ab' :  
    HotKey[index]=0; } A}Vd:#  
    HotKeyMask[index]=0; iThf\  
    bRemoved=TRUE; |9mGX9q  
    KeyCount--; C^!~WFy  
    break; k>#-NPU$  
   } 6\x/Z=}L  
  } `rpmh7*WV  
 } alyA#zao|  
 return bRemoved; &&Otj-n5  
} US&:UzI.  
B~%SB/eu  
void VerifyWindow() >~uKkQ_p  
{ ! ~+mf^D  
 for(int i=0;i<MAX_KEY;i++){ 'Ecd\p  
  if(hCallWnd!=NULL){ y7LM}dH#m  
   if(!IsWindow(hCallWnd)){ ~uuM0POo  
    hCallWnd=NULL; ZSn6JV'g  
    HotKey=0; z=TuUl@  
    HotKeyMask=0; v&xhS yZ  
    KeyCount--; zI_pP?4;.q  
   } k!!d2y6  
  } ]C>h_,EZc  
 } nz Klue  
} jtPHk*>^wu  
>ajcfG .k(  
BOOL CHookApp::InitInstance() D"P<;@ef  
{ Pk:b:(4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9)'wgI#  
 hins=AfxGetInstanceHandle(); Q S<)*  
 InitHotkey(); V# JuNJ  
 return CWinApp::InitInstance(); {mA#'75a#  
} M2M&L,/O  
=64Ju Wvo  
int CHookApp::ExitInstance() avd`7eH2  
{ `LJ.NY pP  
 VerifyWindow();  !~]'&9  
 UnInit(); _ Uv3g lK  
 return CWinApp::ExitInstance(); ^NrC8,p  
} z[0t%]7l  
:(i=> ~O  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file XZxzw*Y1J  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cB2~W%H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^F-AZP /5F  
#if _MSC_VER > 1000 Pa/2])w  
#pragma once Zrq\:KxX  
#endif // _MSC_VER > 1000 nDXy$f8  
?d)FYB  
class CCaptureDlg : public CDialog RY~m Q  
{ ?IR+OCAA  
 // Construction VB~Do?]*k%  
 public: n&FRjq9y  
  BOOL bTray; "=UhTE  
  BOOL bRegistered; #G("Oh  
  BOOL RegisterHotkey(); _x<7^^VT  
  UCHAR cKey; vH{JLN2  
  UCHAR cMask; V4|l7  
  void DeleteIcon(); La si)e=$<  
  void AddIcon(); J_&G\b.9/  
  UINT nCount; ?DC;Hk<  
  void SaveBmp(); &FDWlrG g  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =2d h}8Mz  
  // Dialog Data ^/7Y3n!|3  
  //{{AFX_DATA(CCaptureDlg) a7e.Z9k!  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0V'XE1h  
  CComboBox m_Key; 9<"l!noy  
  BOOL m_bControl; 5I0j>{U&  
  BOOL m_bAlt; <#e!kWGR?  
  BOOL m_bShift; i",oPz7  
  CString m_Path; ( Uk\O`)m  
  CString m_Number; ,h'omU7  
  //}}AFX_DATA 'e7;^s  
  // ClassWizard generated virtual function overrides 8LlWXeD9  
  //{{AFX_VIRTUAL(CCaptureDlg) / KxZ+Ww>v  
 public: D__*?frWpW  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {y|j**NZ  
 protected: )IGx3+I ,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^%/d]Zwb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b+THn'2  
  //}}AFX_VIRTUAL :JzJ(q/  
  // Implementation ''B}^yKEW  
 protected: g;!,2,De}  
  HICON m_hIcon; CK1gzIg>  
  // Generated message map functions /Xw wB  
  //{{AFX_MSG(CCaptureDlg) jn>RE   
  virtual BOOL OnInitDialog(); 0zXF{5Up  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  t/a  
  afx_msg void OnPaint(); t<znz6  
  afx_msg HCURSOR OnQueryDragIcon(); ]]|vQA^  
  virtual void OnCancel(); u]Dds;~"b  
  afx_msg void OnAbout(); tN&X1  
  afx_msg void OnBrowse(); ;h7O_|<%  
  afx_msg void OnChange(); <*DP G\6Ma  
 //}}AFX_MSG !{ /AJb  
 DECLARE_MESSAGE_MAP() G4)X~.Fy  
}; e`Tssa+  
#endif <O]B'Wc [  
=kn-F T  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \>  
#include "stdafx.h" q#.+P1"U  
#include "Capture.h" P6;Cohfh  
#include "CaptureDlg.h" W.  p'T}2  
#include <windowsx.h> Y!AQ7F  
#pragma comment(lib,"hook.lib") Yx<wYzD  
#ifdef _DEBUG KJ8Qi+cZ  
#define new DEBUG_NEW 8\CmM\R  
#undef THIS_FILE :tBZu%N/N  
static char THIS_FILE[] = __FILE__; "y=AVO  
#endif F6-U{+KU$!  
#define IDM_SHELL WM_USER+1 r r(UE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JAI;7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Eb9{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hB-<GGcO <  
class CAboutDlg : public CDialog M}`G}*  
{ Z;J{&OJ3qM  
 public: (c9!:  
  CAboutDlg(); ,98`tB0  
  // Dialog Data vaj-|&  
  //{{AFX_DATA(CAboutDlg) ZVz`-h B  
  enum { IDD = IDD_ABOUTBOX }; f}+8m .g2  
  //}}AFX_DATA  ~b LhI  
  // ClassWizard generated virtual function overrides `r.  
  //{{AFX_VIRTUAL(CAboutDlg) `rI[   
 protected: XnV$}T:?X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nWv6I&  
  //}}AFX_VIRTUAL M7SVD[7~HM  
  // Implementation uzWz+atH  
 protected: G>0 hi1  
  //{{AFX_MSG(CAboutDlg) 2f.4P]s`T  
  //}}AFX_MSG <^wqN!/  
  DECLARE_MESSAGE_MAP() p`{| [<  
}; ^0T[V-PgiD  
f 7j9'k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "SN+ ^`  
{ g(F? qP_K  
 //{{AFX_DATA_INIT(CAboutDlg) >O}J*4A>+#  
 //}}AFX_DATA_INIT B;xGTl@8  
} %Dm:|><V$b  
/S&8%fb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Z1M{5E  
{ $#d.@JWi  
 CDialog::DoDataExchange(pDX); f2RIOL,  
 //{{AFX_DATA_MAP(CAboutDlg) o:Q.XWa@MG  
 //}}AFX_DATA_MAP ?FwjbG<  
} Af7&;8pM  
M]M(E) *5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wT-@v,$  
 //{{AFX_MSG_MAP(CAboutDlg) rgXD>yu(  
 // No message handlers ^Ts8nOGMh  
 //}}AFX_MSG_MAP J9yB'yE8  
END_MESSAGE_MAP() dX5|A_Ex  
Rz!!;<ye8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z7um9g  
: CDialog(CCaptureDlg::IDD, pParent) TeWpdUCO  
{ !x1ivP  
 //{{AFX_DATA_INIT(CCaptureDlg) 2K$#U|Qi  
  m_bControl = FALSE; d NgjM Q  
  m_bAlt = FALSE;  L\("  
  m_bShift = FALSE; :Y2J7p[+  
  m_Path = _T("c:\\"); k;?E,!{  
  m_Number = _T("0 picture captured."); bcC+af0L  
  nCount=0; Ve^rzGU  
  bRegistered=FALSE; j\.\ePmk]  
  bTray=FALSE; sn?YD'>k  
 //}}AFX_DATA_INIT HrS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 WHvU|rJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \Yd 0oe82  
} p) ea1j>N  
TkSeDP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (k&r^V/=  
{ 7T}r]C.  
 CDialog::DoDataExchange(pDX); o!ycVY$yW  
 //{{AFX_DATA_MAP(CCaptureDlg) A J"/T+g_  
  DDX_Control(pDX, IDC_KEY, m_Key); <<.%Gk  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7__?1n~{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >@c~M  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _4#&!b6  
  DDX_Text(pDX, IDC_PATH, m_Path); y<A%&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;(,1pi7|  
 //}}AFX_DATA_MAP ZP^7`q)6  
} ;IX*4E'4s  
Z* L{;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) H{nYZOf/  
//{{AFX_MSG_MAP(CCaptureDlg) UAq%Y8KA  
 ON_WM_SYSCOMMAND() }g|)+V\A  
 ON_WM_PAINT() J}J7A5P  
 ON_WM_QUERYDRAGICON() p7kH"j{xD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yCOIv!/zy  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,3E9H&@j  
 ON_BN_CLICKED(ID_CHANGE, OnChange) XT0:$0F  
//}}AFX_MSG_MAP t?:Q  
END_MESSAGE_MAP()  V_-{TGKX  
$(U}#[Vie  
BOOL CCaptureDlg::OnInitDialog() 7f\@3r  
{ rc9Y:(S1l  
 CDialog::OnInitDialog(); #cD20t  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); gaXKP1m^  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;_hL  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O F CA~sR  
 if (pSysMenu != NULL) #J<IHNRt  
 { {-?8r>  
  CString strAboutMenu; &\/b(|>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8x9$6HO  
  if (!strAboutMenu.IsEmpty()) {IpIQ-@l  
  { s.7s:Q`  
   pSysMenu->AppendMenu(MF_SEPARATOR); lYMNx|PF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }./_fFN@  
  } ?Ok@1  
 } 5zBayJh#  
 SetIcon(m_hIcon, TRUE); // Set big icon d$(>=gzBQ  
 SetIcon(m_hIcon, FALSE); // Set small icon  {!9i8T  
 m_Key.SetCurSel(0); 5pI=K/-  
 RegisterHotkey(); ST[+k  
 CMenu* pMenu=GetSystemMenu(FALSE); 2>bV+[@B  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _cW6H B^j  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~8 w(M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r06M.r   
 return TRUE; // return TRUE unless you set the focus to a control 0{ ;[k  
} (&a<6k  
!(wH}ti  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2og8VI  
{ =!cI@TI  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t|Ipxk.)  
 { p!~{<s]  
  CAboutDlg dlgAbout; 7berkU0P  
  dlgAbout.DoModal(); 5h4E>LB.B  
 } %Fg}"=f1  
 else (s\":5 C  
 { 0fd\R_"d.  
  CDialog::OnSysCommand(nID, lParam); U~w g'  
 } MN22#G4j^w  
} ,LHQ@/}A C  
mzX <!  
void CCaptureDlg::OnPaint() l6S6Y  
{ &PAgab2$  
 if (IsIconic())  !&Z,ev  
 { U5z}i^8a  
  CPaintDC dc(this); // device context for painting {)vue0 vP  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q$(0Nx<  
  // Center icon in client rectangle n*oa J<o%  
  int cxIcon = GetSystemMetrics(SM_CXICON); *KXg;777  
  int cyIcon = GetSystemMetrics(SM_CYICON); -Jtx9P  
  CRect rect; qWzzUM1=  
  GetClientRect(&rect); l^IPN 'O@  
  int x = (rect.Width() - cxIcon + 1) / 2; {vJ)!'Eh  
  int y = (rect.Height() - cyIcon + 1) / 2; #!FLX*,  
  // Draw the icon Bw[jrK  
  dc.DrawIcon(x, y, m_hIcon); l?/.uNw  
 } iC{~~W6  
 else G{cTQH|  
 { :~2An-V  
  CDialog::OnPaint(); kH43 T  
 } ;Q]j"1c  
} %YaUc{.%  
^3-Wxn9&  
HCURSOR CCaptureDlg::OnQueryDragIcon() iZy`5  
{ 2z\4?HJy  
 return (HCURSOR) m_hIcon; P~+?:buqc  
} H<SL=mb;  
elgCPX&:W  
void CCaptureDlg::OnCancel() Y,bw:vX  
{ lK? Z38  
 if(bTray) / h6(!-"  
  DeleteIcon(); Z`?<Ada  
  CDialog::OnCancel(); q-.e9eoc\  
} !vQ!_|g1  
1@ j>2>i  
void CCaptureDlg::OnAbout() G=8w9-Ww  
{ aqb;H 'F  
 CAboutDlg dlg; #&1Y!kbdd  
 dlg.DoModal(); 5g- apod  
} FNDLqf!j  
sQA{[l!aj  
void CCaptureDlg::OnBrowse() {1GW,T!#  
{ %;0w2W  
 CString str; fxDY:l  
 BROWSEINFO bi; hG,gY;&[6  
 char name[MAX_PATH]; 2.2Z'$W  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6[9E^{(z  
 bi.hwndOwner=GetSafeHwnd(); 4M8AYh2)  
 bi.pszDisplayName=name; 6Upg\(  
 bi.lpszTitle="Select folder"; wE75HE`gW  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /s%I(iP4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1>*]jj}  
 if(idl==NULL) >5Zp x8W  
  return; ~^.&nph  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6,xoxNoPP3  
 str.ReleaseBuffer(); g)'tr '  
 m_Path=str; K.2M=Q  
 if(str.GetAt(str.GetLength()-1)!='\\') S iw9_c  
  m_Path+="\\"; r2T?LO0N{  
 UpdateData(FALSE); LoG@(g&)  
} Yi[dS`,d  
t.pg;#  
void CCaptureDlg::SaveBmp() Uc0AsUu}?  
{ Yf:utCvv  
 CDC dc; Kfj*uzKB  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <LW|m7  
 CBitmap bm; $ Yz &x%Lb  
 int Width=GetSystemMetrics(SM_CXSCREEN); HHZ!mYr  
 int Height=GetSystemMetrics(SM_CYSCREEN);  2H<?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Xh]\q)  
 CDC tdc; b,a\`%m}  
 tdc.CreateCompatibleDC(&dc); ^+[o +  
 CBitmap*pOld=tdc.SelectObject(&bm); Z-<v5aF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }bznx[4?I  
 tdc.SelectObject(pOld); L>UYR++<6  
 BITMAP btm; A!k}  
 bm.GetBitmap(&btm); =D xJt7J1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; y`Pp"!P"O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~~1~_0?e  
 BITMAPINFOHEADER bih; Kc udWW]  
 bih.biBitCount=btm.bmBitsPixel; 4Sg!NPuu7&  
 bih.biClrImportant=0; cM4?G gn  
 bih.biClrUsed=0; \|>eG u  
 bih.biCompression=0; oQ;f`JC^  
 bih.biHeight=btm.bmHeight; }WGi9\9T&  
 bih.biPlanes=1; F.8{ H9`  
 bih.biSize=sizeof(BITMAPINFOHEADER); w=e,gNO  
 bih.biSizeImage=size; N0RFPEQ~  
 bih.biWidth=btm.bmWidth; , m|9L{  
 bih.biXPelsPerMeter=0; ,.FTw,<  
 bih.biYPelsPerMeter=0; &up/`8   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;oFaDTX]  
 static int filecount=0; X}z KV  
 CString name; <(p1 j0_Q  
 name.Format("pict%04d.bmp",filecount++); l*Y~h3  
 name=m_Path+name; 0HD1Ob^@  
 BITMAPFILEHEADER bfh; W,{`)NWg  
 bfh.bfReserved1=bfh.bfReserved2=0; _R(5?rG,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0acY@_  
 bfh.bfSize=54+size; N2&aU?`e  
 bfh.bfOffBits=54; Y0B*.H Ae  
 CFile bf; mF F]d  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3/rvSR!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Sw1]]-Es  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N~>?w#?J  
  bf.WriteHuge(lpData,size); CJKH"'u3^  
  bf.Close(); Z `\7B e  
  nCount++; ^}1RDdQ"U  
 } deTbvl  
 GlobalFreePtr(lpData); RO.(k!J .  
 if(nCount==1) vWkKNB  
  m_Number.Format("%d picture captured.",nCount); "(efd~.]  
 else x#8=drh.:C  
  m_Number.Format("%d pictures captured.",nCount); 4\OELU  
  UpdateData(FALSE); Ok`U*j  
} )vU{JY;  
Ic=V:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H+5]3>O-$  
{ aY:(0en]&  
 if(pMsg -> message == WM_KEYDOWN) k13/yiv  
 { +~fu-%,k  
  if(pMsg -> wParam == VK_ESCAPE) M.8!BB7\8e  
   return TRUE; w|nVK9.  
  if(pMsg -> wParam == VK_RETURN) EhFhL4Xdn  
   return TRUE; l.)N  
 } Ba+OoS  
 return CDialog::PreTranslateMessage(pMsg); BWPYHWW}E  
} NUnP'X=J,  
*>'R R<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ABHZ)OM  
{ Lv^j l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ x b0+4w|  
  SaveBmp(); }\0"gM  
  return FALSE; b/K&8C,c  
} ai`:HhE  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _@OYC<  
 CMenu pop; yX~[yH+Pn  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m~U{ V9;*  
 CMenu*pMenu=pop.GetSubMenu(0); F>b6fUtR  
 pMenu->SetDefaultItem(ID_EXITICON); Uqpvj90sw  
 CPoint pt; '9/kDkt!  
 GetCursorPos(&pt); ^n2w6U0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R$@.{d&:w  
 if(id==ID_EXITICON) |Gf{}  
  DeleteIcon(); {f&ga  
 else if(id==ID_EXIT) _uu:)%  
  OnCancel(); :> q?s  
 return FALSE; Y>#c2@^i<  
} j d8 1E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W_ 6Jl5]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7}x-({bqy  
 AddIcon(); )ED[cYGx  
 return res; PjP%,-@1  
} =0)^![y]v  
2>!ykUw^O  
void CCaptureDlg::AddIcon() m5p~>]}fYF  
{ "/'= gE  
 NOTIFYICONDATA data; L,D>E  
 data.cbSize=sizeof(NOTIFYICONDATA); >gSerDH8\  
 CString tip; ~+np7  
 tip.LoadString(IDS_ICONTIP); ,pASjFWi  
 data.hIcon=GetIcon(0); h[8y$.YsC  
 data.hWnd=GetSafeHwnd(); #CS>A# Lk  
 strcpy(data.szTip,tip); lX4p'R-h  
 data.uCallbackMessage=IDM_SHELL; 2bJFlxEU  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; c'B"Onu@m*  
 data.uID=98; "n6Y^  
 Shell_NotifyIcon(NIM_ADD,&data); l =yHx\  
 ShowWindow(SW_HIDE); 9A_7:V]_  
 bTray=TRUE; |i`@!NrFL  
} E&+ ^H on  
6-=_i)kzq  
void CCaptureDlg::DeleteIcon() }gW}Vr <  
{ 7asq]Y}<  
 NOTIFYICONDATA data; XJzXxhk2  
 data.cbSize=sizeof(NOTIFYICONDATA); ".)_kt[  
 data.hWnd=GetSafeHwnd(); O$H150,Q  
 data.uID=98; `-H:j:U{  
 Shell_NotifyIcon(NIM_DELETE,&data); YzZF^q^I  
 ShowWindow(SW_SHOW); .HBvs=i  
 SetForegroundWindow(); (6BCFl:/Q<  
 ShowWindow(SW_SHOWNORMAL); *e6|SZ &3  
 bTray=FALSE; cBI )?  
} %8L<KJd  
 mb/[2y<  
void CCaptureDlg::OnChange() ffM(il/2  
{ 5G<CDgl^!  
 RegisterHotkey(); 4cQ5E9  
} mvgm o  
Flxo%g};  
BOOL CCaptureDlg::RegisterHotkey() `0^i #  
{ /=@vG Vp6  
 UpdateData(); lz(,;I'x  
 UCHAR mask=0; ^PQV3\N  
 UCHAR key=0; gxOmbQt@;  
 if(m_bControl) OD]J@m  
  mask|=4; xiF%\#N  
 if(m_bAlt) )!d1<p3  
  mask|=2; s.sy7%{  
 if(m_bShift) 9>R|k$`  
  mask|=1; 6EU4  
  key=Key_Table[m_Key.GetCurSel()]; \vsrBM  
 if(bRegistered){ 5gD)2Q6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Y/0O9}hf  
  bRegistered=FALSE; .dCP8|  
 } u =kSs  
 cMask=mask; 6Qb)Uq3}]  
 cKey=key; u mlZ(??.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ge?-^s4M  
 return bRegistered; <~M9 nz(<  
} -YV4  O  
X=pt}j,QrP  
  四、小结  ^qqHq  
?Q)Z..7  
  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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