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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: 9@06]EI_  
  nC^'2z  
  一、实现方法 <4g^c&  
p* @L1  
  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: )[1m$>  
/L.a:Er$  
#pragma data_seg("shareddata") z0sB*5VH  
HHOOK hHook =NULL; //钩子句柄 FQyiIT6  
UINT nHookCount =0; //挂接的程序数目 1yu!:8=ee  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %0 4n,&mg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $c-3Q|C  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey sq_:U_tJ  
static int KeyCount =0;  y^Lw7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 XHr{\/4V  
#pragma data_seg() :$j~;)2  
O 2U/zF:X  
  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。 DKZ69^  
Li2)~4p><  
  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: m_B5M0},  
vF,l?cU~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `4CRpz  
cKey,UCHAR cMask) kBzzi^cl  
{ <@Ew-JU  
 BOOL bAdded=FALSE; S-v9z:M3  
 for(int index=0;index<MAX_KEY;index++){ 2*Gl|@~N  
  if(hCallWnd[index]==0){ :CH'Bt4<  
   hCallWnd[index]=hWnd; Ju:=-5r"'  
   HotKey[index]=cKey; gg6&Fzp  
   HotKeyMask[index]=cMask; GF k?Qf{u  
   bAdded=TRUE; m V^dIm  
   KeyCount++; z.{y VQE  
   break; qHv W{0E  
  } 7\jH?Zi  
 } OxqP:kM  
 return bAdded; QO|ODW+D  
} u} KiSZxt  
//删除热键 +LrW#K;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {\ .2h  
{ ,kLeK{   
 BOOL bRemoved=FALSE; SqEO ] ~  
 for(int index=0;index<MAX_KEY;index++){ 1f~_# EIC  
  if(hCallWnd[index]==hWnd){ ^GL0|G=(1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \)r#?qn4z;  
    hCallWnd[index]=NULL; k 9s3@S  
    HotKey[index]=0; .}j@(D  
    HotKeyMask[index]=0; !n !~Bw  
    bRemoved=TRUE; ,m0=zH4+:  
    KeyCount--; =#1/<q)L  
    break; &(wik#S  
   } # VR}6Jv  
  } nar=\cs~g  
 } r}XD{F}"  
 return bRemoved; ]Y, 7 X  
} F2+lwycY  
*6k (xL  
6`EyzB%.$  
  DLL中的钩子函数如下: ~lQ]PKJ"  
oq;}q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `SOaQ|H  
{ _*&<hAZj  
 BOOL bProcessed=FALSE; {>5c,L$  
 if(HC_ACTION==nCode) vW~_+:),e  
 { EEF}Wf$f  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1=#`&f5f&  
   switch(wParam) tjYe82  
   {  g[!sGa &  
    case VK_MENU: 'O2{0  
     MaskBits&=~ALTBIT; $YL} rM  
     break; @-Gf+*GZys  
    case VK_CONTROL: 8CMI\yk  
     MaskBits&=~CTRLBIT; NW^}u~-f  
     break; {jr>Z"/q  
    case VK_SHIFT: !'n+0  
     MaskBits&=~SHIFTBIT; v]vrD2L  
     break; Z;lE-`Z*(F  
    default: //judge the key and send message vE{QN<6T  
     break; cjH ~H8  
   } d0 |Q1R+3  
   for(int index=0;index<MAX_KEY;index++){ c a$D|3  
    if(hCallWnd[index]==NULL) >e8 t  
     continue; Rm6<"SLV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A@&+!sO  
    { Cf8(J k`v|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /V:%}Z  
     bProcessed=TRUE; cLJ|VD7  
    } {hVSVx8ZL  
   } :B)w0tVw  
  } -.:1nI  
  else if((lParam&0xc000ffff)==1){ //有键按下 7;c{lQOj}  
   switch(wParam) D[yaAG<  
   { YjLPW@  
    case VK_MENU: 3{~h Rd  
     MaskBits|=ALTBIT; &V iIxJZ1$  
     break; :9]23'Md  
    case VK_CONTROL: h&.9Q{D  
     MaskBits|=CTRLBIT; tz._*n83  
     break; 4Uz6*IQNl  
    case VK_SHIFT: mn4j#-  
     MaskBits|=SHIFTBIT; +qjW;]yxP  
     break; ,O $F`0>9A  
    default: //judge the key and send message m[]p IXc(  
     break; et/mfzV  
   } G2rxr  
   for(int index=0;index<MAX_KEY;index++){ 0nG& LL5  
    if(hCallWnd[index]==NULL) TkmN.@w_C  
     continue; O:pQf/Xn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vAU^<$D27  
    { o %Pi;8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .r[J} O"  
     bProcessed=TRUE; Oj~k1+*  
    } ';zLh  
   } [ZDJs`h!`  
  } :IbrV@gN{@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _/ P"ulNb  
   for(int index=0;index<MAX_KEY;index++){ nr-VzF7zu  
    if(hCallWnd[index]==NULL) l<GRM1^kU  
     continue; ) Q~Q .  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [uZU p*.V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )bPwB.}kq  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 B_c(3n-"  
   } _17c}o#`5w  
  } W  $H8[G  
 } kZSe#'R's  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S3btx9y{  
} 2ggW4`"c  
JnV$)EYi  
  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: ^EZ)NG=e5  
75I* &Wl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I`DdhMi7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,7 >_Lp_v  
{l\v J#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: @b-?KH  
I{B8'n{cN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ft:/-$&H  
{ 0z.`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) tH17Z  
 { 2Xe2 %{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 kZPj{^c:  
  SaveBmp(); @fbvu_-].  
  return FALSE; khc5h^0  
 } jk) V[7P  
 …… //其它处理及默认处理 pr@8PD2%  
} cf@:rHB}  
?HZ+fS ,-  
)x?F1/  
  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。 !\+SE"ml  
AO>K 6{  
  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。 3U1xKF  
eEezd[p  
  二、编程步骤 'X@j  
p.8G]pS  
  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"; 4)Z78H%>  
9QWS[E4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1UxRN7  
7&|fD{:4U  
  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; YNk?1#k?i  
?Za1  b  
  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; L{<E'#@F  
is#?O5:2  
  5、 添加代码,编译运行程序。 Kax85)9u  
0#XZ_(@%  
三、程序代码 Gq+!%'][P  
c1jgBty  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL vseuk@>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #sAEIk/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %|l*=v  
#if _MSC_VER > 1000 Wa ,[#H  
#pragma once _2U1$0xK  
#endif // _MSC_VER > 1000 ]>*Z 1g;  
#ifndef __AFXWIN_H__ =GFlaGD  
#error include 'stdafx.h' before including this file for PCH &d9";V"E  
#endif F0Rk[GM  
#include "resource.h" // main symbols WElB,a-RCp  
class CHookApp : public CWinApp vIz~B2%x  
{ [A[vR7&S  
 public: a2o+ tR;H  
  CHookApp(); 2Hy$SSH  
  // Overrides ~(4cnD)BO  
  // ClassWizard generated virtual function overrides o`hF1*yp  
  //{{AFX_VIRTUAL(CHookApp) v3.JG]zLpP  
 public: spd>.Cm`  
  virtual BOOL InitInstance(); ?ry`+nx  
  virtual int ExitInstance(); #L BZ%%v  
  //}}AFX_VIRTUAL !63x^# kg  
  //{{AFX_MSG(CHookApp) 9J0m  
  // NOTE - the ClassWizard will add and remove member functions here. U,aV {qz  
  // DO NOT EDIT what you see in these blocks of generated code ! ^ 8egn|  
  //}}AFX_MSG gQ,PG  
  DECLARE_MESSAGE_MAP() /':kJOk<[  
};  A5Y z|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Sf lHSMFw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b_cD >A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <:>a51HBX  
BOOL InitHotkey(); :2K0/@<x  
BOOL UnInit(); Z`q?pE>R  
#endif @/B&R^aVZ  
e9N"{kDs6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &YqgMC  
#include "stdafx.h" L[Tr"BW  
#include "hook.h" }|AUV  
#include <windowsx.h> /R 2:Js  
#ifdef _DEBUG u@[D*c1!H  
#define new DEBUG_NEW vKol@7%N  
#undef THIS_FILE a&wl-  
static char THIS_FILE[] = __FILE__; umSbxEZU@  
#endif Rf2;O<  
#define MAX_KEY 100 'd0]`2tVg4  
#define CTRLBIT 0x04 u= !?<Q  
#define ALTBIT 0x02 &*[T  
#define SHIFTBIT 0x01  h ej  
#pragma data_seg("shareddata") 1r|'n aiZ  
HHOOK hHook =NULL; oT%~)g  
UINT nHookCount =0; Pou`PNvH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f{k2sU*uBE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT iS=} | 8"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4CfPa6_  
static int KeyCount =0; }(20MW8rMc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j`='SzVloW  
#pragma data_seg() WPCaxA+l  
HINSTANCE hins; ZU7,=B=  
void VerifyWindow(); /&cb`^"U^  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r Fdq \BSi  
//{{AFX_MSG_MAP(CHookApp) wUW+S5"K  
// NOTE - the ClassWizard will add and remove mapping macros here. \ec,=7S<Zf  
// DO NOT EDIT what you see in these blocks of generated code! 7 45Uo'  
//}}AFX_MSG_MAP JX`+b  
END_MESSAGE_MAP() q<D'"7#.  
![{>f6{J  
CHookApp::CHookApp() W@JmG`Sy  
{ :a[L-lr`e  
 // TODO: add construction code here, :W-"UW,  
 // Place all significant initialization in InitInstance QJ-6aB  
} -HS(<V=a?k  
Qc Ia%lf  
CHookApp theApp; K"#np!Y)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [|Jz s[  
{ )TBBYCL3  
 BOOL bProcessed=FALSE; O: :X$O7  
 if(HC_ACTION==nCode) ixE72bX  
 { d%u|) =7  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8u!!a^F  
   switch(wParam) j<Lj1 P3  
   { ]fnc.^{  
    case VK_MENU: Jf YO|,  
     MaskBits&=~ALTBIT; ((B7k{`  
     break; 3a"4Fn  
    case VK_CONTROL: 7%&#V2  
     MaskBits&=~CTRLBIT;  Fp'k{  
     break; p\WW~qD  
    case VK_SHIFT: yL7a*C&  
     MaskBits&=~SHIFTBIT; 0!eZ&.h?4  
     break; oV&AJ=|\  
    default: //judge the key and send message vp{jh-&  
     break; jDqe)uVvtV  
   } Vf`1'GY  
   for(int index=0;index<MAX_KEY;index++){ "U4Sn'&h@  
    if(hCallWnd[index]==NULL) 4b,N"w{v  
     continue; {%)bxk6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fnN"a Z  
    { gp$oQh#37;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wtu WzHrF  
     bProcessed=TRUE; :1PT`:Y  
    } $NWXn,Y'  
   } N3!x7J7A  
  } 7D@O:yO  
  else if((lParam&0xc000ffff)==1){ //Key down >Ke4lO"  
   switch(wParam) :{E;*v_!v  
   { Dny5X.8  
    case VK_MENU: V{HP8f91  
     MaskBits|=ALTBIT; -WWa`,:  
     break; R0B\| O0Uv  
    case VK_CONTROL: 2E9Cp  
     MaskBits|=CTRLBIT; #tRLvOR:  
     break; t5\~Z}G8  
    case VK_SHIFT: <w}YD @(f  
     MaskBits|=SHIFTBIT; MRMsw NQ  
     break; E=_M=5]  
    default: //judge the key and send message Mm;kB/ 1  
     break; Jlj=FA`  
   } /U4F\pZl  
   for(int index=0;index<MAX_KEY;index++) CE=&ZHt9  
   { l&R~ I6^E  
    if(hCallWnd[index]==NULL) 5Q;Fwtm  
     continue; e23}'qb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $-Lk,}s.*  
    { zWb>y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n ,!PyJ  
     bProcessed=TRUE; @T0F }(k  
    } "t$c'`  
   } SzR7:U  
  } |JC/A;ZH  
  if(!bProcessed){ w+)MrB-}  
   for(int index=0;index<MAX_KEY;index++){ swss#?.se  
    if(hCallWnd[index]==NULL) s5F,*<  
     continue; s2FJ^4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z@R:~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8J-$+ ;  
   } :G=N|3  
  } 0,a\vs%@X  
 } 2MS1<VKZ@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9tDo5 29  
} ]vo&NE  
7s+3^'  
BOOL InitHotkey() +&6R(7XC  
{ />=)=CGv;  
 if(hHook!=NULL){ ..`J-k  
  nHookCount++; hK5BOq!y  
  return TRUE; tgCEz%  
 } :s`~m;Y9?  
 else D[yOFJ~p)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j qfxQ  
  if(hHook!=NULL) .Zv@iL5  
   nHookCount++; `dO)}}| y  
  return (hHook!=NULL); Xxhzzm-B  
} 00X~/'!  
BOOL UnInit() Wnm?a!j5  
{ a NhI<.v  
 if(nHookCount>1){ 9#Gz2u$  
  nHookCount--; mxt fKPb  
  return TRUE; Y3KKskhLx  
 } .aTu]i3l_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); N/IDj2C4  
 if(unhooked==TRUE){ XUTI0  
  nHookCount=0; DC4O@"  
  hHook=NULL; _+7 3Y'  
 } Y7g^ ?6  
 return unhooked; -T3 z@k  
} o?%1^6&HE  
~5g2~.&*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `/$yCXy  
{ {=};<;_F  
 BOOL bAdded=FALSE; \ t4:(Jp 3  
 for(int index=0;index<MAX_KEY;index++){ KKB&)R  
  if(hCallWnd[index]==0){ X!#rw= Q  
   hCallWnd[index]=hWnd; pm`BMy<5PU  
   HotKey[index]=cKey; fl%X>\i/7  
   HotKeyMask[index]=cMask; 4&]Sb}  
   bAdded=TRUE; Zt;3HY=y  
   KeyCount++; T:k-`t0":N  
   break; $ <'i+kK  
  } BSU%.tmI  
 } |-t>_+. J'  
 return bAdded;  |e49F  
} 2wCTd:e:  
=M39I&N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eb%`ox@&  
{ \o}m]v i  
 BOOL bRemoved=FALSE; www#.D%'U  
 for(int index=0;index<MAX_KEY;index++){ ^U1@ hq*u  
  if(hCallWnd[index]==hWnd){ u~[=5r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O)v?GQRj  
    hCallWnd[index]=NULL; XL SYE   
    HotKey[index]=0; W:s`;8iM$  
    HotKeyMask[index]=0; ++{,1wY\  
    bRemoved=TRUE; g>].m8DZ'  
    KeyCount--; /*Xr^X6  
    break; E d6k7  
   } /~=W3lhY  
  } [H"\<"1o  
 } mIk8hA@B_  
 return bRemoved; y8~/EyY|^  
} 9Q)9*nHe  
qkHdr2  
void VerifyWindow() 8['8ctX  
{ vq(ElXTO  
 for(int i=0;i<MAX_KEY;i++){ fSR+~Vy  
  if(hCallWnd!=NULL){ x$p_mWC  
   if(!IsWindow(hCallWnd)){ Rb!V{jQ  
    hCallWnd=NULL; {k:W?`  
    HotKey=0; 1dsMmD[O  
    HotKeyMask=0; 9UbD =}W  
    KeyCount--; -l)u`f^n|  
   } Eu;f~ V  
  } 5SOl:{A +  
 } ]!% p21e  
} '#Yqs/V  
Z@i"/~B|4\  
BOOL CHookApp::InitInstance() ?7?hDw_Nk  
{ jEa U;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); q-tm `t*7  
 hins=AfxGetInstanceHandle(); 8 16OV  
 InitHotkey(); YoU|)6Of   
 return CWinApp::InitInstance(); ^/`W0kT  
} <Sn;k[M}d  
Wjf,AjL\  
int CHookApp::ExitInstance() LN!e_b  
{ V:Z}cfR.7  
 VerifyWindow(); * |dz.Tr  
 UnInit(); }hoyjzv]L  
 return CWinApp::ExitInstance(); #.KVT#%~{  
} ;kE|Vx  
Gt|m;o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file agI"Kh]j?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _{k-&I  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wr`+xYuuC=  
#if _MSC_VER > 1000 igGg[I1?  
#pragma once Mtw7aK  
#endif // _MSC_VER > 1000 :U{$G( <  
8c%Sd'+Pt  
class CCaptureDlg : public CDialog Vs"1:gi&  
{ dX^d\ wX  
 // Construction $eSSW+8q"  
 public: (gQr?K  
  BOOL bTray; rYn)E=FG/  
  BOOL bRegistered; 8hZY Z /T  
  BOOL RegisterHotkey(); Dr oa1_FX  
  UCHAR cKey; =^5,ua6  
  UCHAR cMask; xj#anr  
  void DeleteIcon(); Tu[I84  
  void AddIcon(); eE0'3?q(  
  UINT nCount; mzGMYi*  
  void SaveBmp(); l'Kx#y$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +U^H`\EUr  
  // Dialog Data nQm (UN  
  //{{AFX_DATA(CCaptureDlg) *u)#yEJ)  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;x|LB>.  
  CComboBox m_Key; |!?lwBs4  
  BOOL m_bControl; 25H=RTw  
  BOOL m_bAlt; VLP'3 qX  
  BOOL m_bShift; 5\jzIB_?  
  CString m_Path; ^U.t5jj  
  CString m_Number; x1'4njTV$  
  //}}AFX_DATA S0]JeP+3!  
  // ClassWizard generated virtual function overrides a)qlrtCl  
  //{{AFX_VIRTUAL(CCaptureDlg) k )=Gyv<  
 public: i[O{ M`Z%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); zEMZz$Y  
 protected: @p 2XaqZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MD+e!A#o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JF6=0  
  //}}AFX_VIRTUAL g}gOAN3.  
  // Implementation dml,|k=  
 protected: 6Q~(ibKx  
  HICON m_hIcon; 9lR-  
  // Generated message map functions +zINnX  
  //{{AFX_MSG(CCaptureDlg) ~LU$ no^  
  virtual BOOL OnInitDialog(); R\Of ,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j9g0k<eg  
  afx_msg void OnPaint(); 4V7=VZ, @3  
  afx_msg HCURSOR OnQueryDragIcon(); mXK7y.9\  
  virtual void OnCancel(); 8k9q@FSln  
  afx_msg void OnAbout(); &S9O:>=*  
  afx_msg void OnBrowse(); lDVw2J'p  
  afx_msg void OnChange(); (4Ha'uqz  
 //}}AFX_MSG fI"OzIJV  
 DECLARE_MESSAGE_MAP() w%uM=YmuT  
}; <o"2z~gv  
#endif V: P   
W@p27Tiq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |,lw$k93  
#include "stdafx.h" =j^wa')  
#include "Capture.h" 9FcH\2J  
#include "CaptureDlg.h" X(qs]:  
#include <windowsx.h> /?B%,$~  
#pragma comment(lib,"hook.lib") 01">$  
#ifdef _DEBUG "YoFUfaNg  
#define new DEBUG_NEW ^<`uyY))Q  
#undef THIS_FILE  +OeoA{-W  
static char THIS_FILE[] = __FILE__; xW+ XN`77  
#endif 9ohO-t$XkY  
#define IDM_SHELL WM_USER+1 B]wfDUG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m* rw?nLZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U`kO<ztk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5D<"kT  
class CAboutDlg : public CDialog J"?jaa2~  
{ wY{!gQ  
 public: '~n=<Y  
  CAboutDlg(); _[{oK G^u  
  // Dialog Data ds:&{~7L<T  
  //{{AFX_DATA(CAboutDlg) iL;{]A'0  
  enum { IDD = IDD_ABOUTBOX };  G4{TJ,~  
  //}}AFX_DATA !HSX:qAP$  
  // ClassWizard generated virtual function overrides PmlQW!gfBi  
  //{{AFX_VIRTUAL(CAboutDlg) Y8Z-m (OQ  
 protected: %R@&8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wt1Y&D  
  //}}AFX_VIRTUAL f,:2\b?.  
  // Implementation 6'\VPjt  
 protected: [9,34/i  
  //{{AFX_MSG(CAboutDlg) my*E7[  
  //}}AFX_MSG , %$Cfu  
  DECLARE_MESSAGE_MAP() fk'DJf[M  
}; Q|tzA10E  
:,pdR>q%(y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ku^0bq}BrH  
{ @i>o+>V  
 //{{AFX_DATA_INIT(CAboutDlg) )O$T; U  
 //}}AFX_DATA_INIT NzC&ctPk  
} |6T"T P  
A}MF>.!}C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) C`b)}dY  
{ -MuKeCgi  
 CDialog::DoDataExchange(pDX); ]:Sb#=,!&!  
 //{{AFX_DATA_MAP(CAboutDlg) g]m}@b6(h  
 //}}AFX_DATA_MAP Mk|*=#e;  
} yCZ[z A  
ggHz-oNY  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z]n&,q,5g  
 //{{AFX_MSG_MAP(CAboutDlg) 9B2`FJ  
 // No message handlers s,]z6L0  
 //}}AFX_MSG_MAP ldNWdz  
END_MESSAGE_MAP() ;`rz]7,*  
XE?,)8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FcmL 4^s.`  
: CDialog(CCaptureDlg::IDD, pParent) X,ok3c4X  
{  "xp>Vj  
 //{{AFX_DATA_INIT(CCaptureDlg) "= >8UR  
  m_bControl = FALSE; _2rxDd1#.  
  m_bAlt = FALSE; ;0;5+ J7  
  m_bShift = FALSE; #r;uM+  
  m_Path = _T("c:\\"); Rkh ^|_<!  
  m_Number = _T("0 picture captured."); $*vj7V_  
  nCount=0; * vP:+]  
  bRegistered=FALSE; M<cm]  
  bTray=FALSE; w_9[y  
 //}}AFX_DATA_INIT +YnQOh%v0s  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BTa#}LBZ+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &d&nsQ  
} N7}y U~j^  
'jjJ[16"d  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1j\wvPLr  
{ =8 01nZJ  
 CDialog::DoDataExchange(pDX); [K#pU:lTH  
 //{{AFX_DATA_MAP(CCaptureDlg) @2R+?2 j  
  DDX_Control(pDX, IDC_KEY, m_Key); 8e}8@[h  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u%rB]a$/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); S<nbNSu6+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ah|`),o(k  
  DDX_Text(pDX, IDC_PATH, m_Path); -r@/8"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;BjJ<?^{  
 //}}AFX_DATA_MAP [eZ'h8  
} q\T}jF\t  
, \R,O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .q_SA-!w>  
//{{AFX_MSG_MAP(CCaptureDlg) x qLIs:*  
 ON_WM_SYSCOMMAND() uoe>T:  
 ON_WM_PAINT() T[]kun  
 ON_WM_QUERYDRAGICON() m_,j)A%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9<6Hs3|.!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A:YWXcg  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <PTi>C8;r  
//}}AFX_MSG_MAP  cvO;xR  
END_MESSAGE_MAP() <G#z;]N  
V|G[j\]E<  
BOOL CCaptureDlg::OnInitDialog() 6uubkt  
{ *tL1t\jY  
 CDialog::OnInitDialog(); Nj|~3 *KO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z+F:_  
 ASSERT(IDM_ABOUTBOX < 0xF000); Cswa5 l`af  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @ )m9#F  
 if (pSysMenu != NULL) jS'hs>Ot  
 { hv 8j$2m  
  CString strAboutMenu; ^9xsbv B0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8`;3`lZ  
  if (!strAboutMenu.IsEmpty()) MRL,#+VxA  
  { W!4xE  
   pSysMenu->AppendMenu(MF_SEPARATOR); kG|pM54:^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); oLz9mqp2%  
  } }*R.>jQ+Y  
 } ;+4X<)y*>  
 SetIcon(m_hIcon, TRUE); // Set big icon ?KtvXTy{m  
 SetIcon(m_hIcon, FALSE); // Set small icon <nE|Y@S  
 m_Key.SetCurSel(0); z{dn   
 RegisterHotkey(); 9S$?2z".2  
 CMenu* pMenu=GetSystemMenu(FALSE); R; Gf3K  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3-$w5O3}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HP*AN@>Kw  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ffE&=eh)  
 return TRUE; // return TRUE unless you set the focus to a control uq_h8JH$  
} P'q . _U  
`8N],X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <|_b:  
{ :z}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) M}W};~V2ng  
 { tx{tIw^2;  
  CAboutDlg dlgAbout; i=8){G X4  
  dlgAbout.DoModal(); ?UV ^6  
 } J t,7S4JL  
 else 1[r;  
 { {qkd63 X  
  CDialog::OnSysCommand(nID, lParam); o= N_0.  
 } ,Jh('r7  
} HRZ3}8Qj  
I\peO/w  
void CCaptureDlg::OnPaint() |? l6S  
{ n*U+jc  
 if (IsIconic()) _I}rQfPJ  
 { [Q*aJLG  
  CPaintDC dc(this); // device context for painting 9dXtugp|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a?QDf5C q  
  // Center icon in client rectangle uSi/|  
  int cxIcon = GetSystemMetrics(SM_CXICON); Je~d/,^WU  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~ E|L4E  
  CRect rect; yNu%D$6u7  
  GetClientRect(&rect); J>Uzd, /  
  int x = (rect.Width() - cxIcon + 1) / 2; i&dMX:fRd  
  int y = (rect.Height() - cyIcon + 1) / 2; {|Pz9a- :  
  // Draw the icon fG\]&LFBU  
  dc.DrawIcon(x, y, m_hIcon); hV4\#K[  
 } Mb0cdK?hA  
 else 9Ucn 6[W  
 { MOEB{~v`;  
  CDialog::OnPaint(); HJ,sZ4*]]  
 } 4$<-3IP,  
} >4}2~;  
!^*I?9P  
HCURSOR CCaptureDlg::OnQueryDragIcon() <r{ )*]#l  
{ k(v8zDq*  
 return (HCURSOR) m_hIcon; * 5Y.9g3)Q  
} KU}HVM{  
bs_"Nn?  
void CCaptureDlg::OnCancel() dQ4K^u  
{  ^"d!(npw  
 if(bTray) ^v].mV/  
  DeleteIcon(); k$7@@?<  
  CDialog::OnCancel(); ii :h E=  
} "nK(+Z  
&JpFt^IHi  
void CCaptureDlg::OnAbout() wbaXRvg  
{ ceu}Lp^%/  
 CAboutDlg dlg; iEf6oM  
 dlg.DoModal(); Jy X7I,0  
} >r"~t70C~]  
 } Rc8\,  
void CCaptureDlg::OnBrowse() SEc3`y;j%  
{ S6sw)  
 CString str; \KaWR  
 BROWSEINFO bi; Q(2X$7iRq  
 char name[MAX_PATH]; )A4WK+yD$z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zaVDe9B,7  
 bi.hwndOwner=GetSafeHwnd(); |ei?s1)  
 bi.pszDisplayName=name; aQEMCWxZ  
 bi.lpszTitle="Select folder"; J0U9zI4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bTn7$EG  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L:y} L  
 if(idl==NULL) syYg, G[  
  return; Hop$w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <(Wa8PY2(  
 str.ReleaseBuffer(); <M1XG7_I  
 m_Path=str; g& *pk5V>  
 if(str.GetAt(str.GetLength()-1)!='\\') X]Emz"   
  m_Path+="\\"; nJ|8#U7  
 UpdateData(FALSE); .wD>0Ig  
} #(53YoV_8  
"kKIVlC  
void CCaptureDlg::SaveBmp() O]n"aAu@  
{ qYW{$K  
 CDC dc; =Po!\[SBU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OKp(A  
 CBitmap bm; sM?bUg0w  
 int Width=GetSystemMetrics(SM_CXSCREEN); /AR;O4X+  
 int Height=GetSystemMetrics(SM_CYSCREEN); q($lL~Ls  
 bm.CreateCompatibleBitmap(&dc,Width,Height); JqO#W1h~R|  
 CDC tdc; TIV1?S  
 tdc.CreateCompatibleDC(&dc); N2VF_[l  
 CBitmap*pOld=tdc.SelectObject(&bm); +OF(CcA^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zJ#e3o .  
 tdc.SelectObject(pOld); &DFe+y~PR  
 BITMAP btm; $;_'5`xs  
 bm.GetBitmap(&btm); ,$habq=;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; m%$z&<!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l|Zw Zix  
 BITMAPINFOHEADER bih; -0Q:0wU  
 bih.biBitCount=btm.bmBitsPixel; )Xa`LG =|  
 bih.biClrImportant=0; vL13~q*F  
 bih.biClrUsed=0; }}?L'Vby  
 bih.biCompression=0; A>$VkGo  
 bih.biHeight=btm.bmHeight; i_4FxC4  
 bih.biPlanes=1; r6Z&i^cMe  
 bih.biSize=sizeof(BITMAPINFOHEADER); I C9:&C[  
 bih.biSizeImage=size; 56*}}B$?  
 bih.biWidth=btm.bmWidth; ' %OQd?MhL  
 bih.biXPelsPerMeter=0; QzIK580%t  
 bih.biYPelsPerMeter=0; e+=Ojo#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g?M\Z";  
 static int filecount=0; /40Z-'Bl=(  
 CString name; f3-=?Z  
 name.Format("pict%04d.bmp",filecount++); H!&]Di1Eh  
 name=m_Path+name; KMznl=LF  
 BITMAPFILEHEADER bfh; A5Yfm.Jy  
 bfh.bfReserved1=bfh.bfReserved2=0; !a3cEzs3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N40.GL0s  
 bfh.bfSize=54+size; `6!l!8 v  
 bfh.bfOffBits=54; 'R~x.NM  
 CFile bf; _U$d.B'*)z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [dsH0 D&T  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jh`&c{#*)M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G3 #c  
  bf.WriteHuge(lpData,size); i}RxTmG<  
  bf.Close(); #:z.Br`  
  nCount++; DI9x] CR  
 } HPp Kti7g  
 GlobalFreePtr(lpData); Aa.bE,W  
 if(nCount==1) V_!hrKkL  
  m_Number.Format("%d picture captured.",nCount); Gy 'l;2  
 else 1c,$D5#  
  m_Number.Format("%d pictures captured.",nCount); ,g{`M]Ov  
  UpdateData(FALSE); TH)gW  
} G F,/<R#  
G[6V=G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %|o4 U0c  
{ .BlGV2@^#  
 if(pMsg -> message == WM_KEYDOWN) ,jbj-b(  
 { rayC1#f  
  if(pMsg -> wParam == VK_ESCAPE) Eti;(>"@  
   return TRUE; z)q9O_g9  
  if(pMsg -> wParam == VK_RETURN) . 5|wy<  
   return TRUE; `>'E4z]-_  
 } -GCGxC2u  
 return CDialog::PreTranslateMessage(pMsg); >&e|ins^N  
} W:b8m Xx  
<;+&`R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N4}/n  
{ k%/Z.4vQG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +Ld4 e]  
  SaveBmp(); ed2QGTgR  
  return FALSE; (5;w^E9*n;  
} EG59L~nM  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5X nA.?F^  
 CMenu pop; a*NcL(OC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]gHw;ry  
 CMenu*pMenu=pop.GetSubMenu(0); ]k]P (w  
 pMenu->SetDefaultItem(ID_EXITICON); ,F.\z^\{  
 CPoint pt; :Y0*P  
 GetCursorPos(&pt); $dgY#ST%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y0M^oLx  
 if(id==ID_EXITICON) &2Q4{i  
  DeleteIcon(); W'-B)li   
 else if(id==ID_EXIT) @.a[2,o_  
  OnCancel(); pqBd#  
 return FALSE; /^ i7^  
} ON~SZa  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gsqlWfa  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 60*2k  
 AddIcon(); Aj;Z &  
 return res; !TVlsm  
} G  2+A`\]  
u8v;O}#  
void CCaptureDlg::AddIcon() Im+<oZ  
{ TPt<(-}W  
 NOTIFYICONDATA data; /^G1wz2  
 data.cbSize=sizeof(NOTIFYICONDATA); 6OF&Q`*4  
 CString tip; D1;H,  
 tip.LoadString(IDS_ICONTIP); D?)91P/R  
 data.hIcon=GetIcon(0); ,Za!  
 data.hWnd=GetSafeHwnd(); ^0R.'XL  
 strcpy(data.szTip,tip); PP.QfY4  
 data.uCallbackMessage=IDM_SHELL; D4ESo)15'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; p}.L]Y  
 data.uID=98; ow!utAF  
 Shell_NotifyIcon(NIM_ADD,&data); xJa  
 ShowWindow(SW_HIDE); 0g,;Yzm  
 bTray=TRUE; (g`G(K_  
} 0hn N>?  
!=3[Bm G  
void CCaptureDlg::DeleteIcon() /9,!)/j  
{ t Q385en  
 NOTIFYICONDATA data; UIi;&[  
 data.cbSize=sizeof(NOTIFYICONDATA); Q35$GFj"jD  
 data.hWnd=GetSafeHwnd(); Waj6.PCFm  
 data.uID=98; X&8&NkH  
 Shell_NotifyIcon(NIM_DELETE,&data); oa?bOm  
 ShowWindow(SW_SHOW); <xKer<D %  
 SetForegroundWindow(); 3~ ;LNi  
 ShowWindow(SW_SHOWNORMAL); -uIu-a]  
 bTray=FALSE; 3'}(:X(  
} }KEyJj3"DA  
b lP@Cn2  
void CCaptureDlg::OnChange() |,c QJ  
{ Fo=Icvo  
 RegisterHotkey(); g'ha7~w(p  
} s3>,%8O6  
)q 8w+'z  
BOOL CCaptureDlg::RegisterHotkey() JcL4q\g  
{ :3pJGMv(  
 UpdateData(); V##=-KZ  
 UCHAR mask=0; { Iy<iV  
 UCHAR key=0; xeF0^p7Z  
 if(m_bControl) c Owa^;  
  mask|=4; \1cay#X  
 if(m_bAlt) ig5 d-A  
  mask|=2; 'G;y!<a  
 if(m_bShift) 9E5Ec~l  
  mask|=1; 3gV 17a  
  key=Key_Table[m_Key.GetCurSel()]; XZD9vFj1Z  
 if(bRegistered){ zePVB -@u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "SJp9s3  
  bRegistered=FALSE; [KR|m,QWp  
 } ? C1.g'}7  
 cMask=mask; 8/F}vfKEN  
 cKey=key; +!h~T5Ck  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {+%|n OWV  
 return bRegistered; l2vIKc  
} dmI~$*  
 +:k Iq  
  四、小结 b;G3&R]  
C62:G+W&o  
  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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