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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: )Zu Q;p  
  nw]e_sm  
  一、实现方法 VK@i#/jm  
h9)]N&07b  
  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: X=!n,=xI  
,~=z_G`R  
#pragma data_seg("shareddata") !_/8!95  
HHOOK hHook =NULL; //钩子句柄 \I o?ul}za  
UINT nHookCount =0; //挂接的程序数目 EL)/5-=S  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 K:lT-*+S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?'8MI|*l%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [(.T%kJ  
static int KeyCount =0; 59%f|.Z)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 zdpLAr  
#pragma data_seg() cO"Xg<#y  
>TJKH^7n  
  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。 QWQ6j#`  
Q1>Op$>h  
  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: \`iW__  
M0"g/W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR q0KXuMK  
cKey,UCHAR cMask) K:mL%o2J  
{ Xy(SzJ %  
 BOOL bAdded=FALSE; }s)&/~6  
 for(int index=0;index<MAX_KEY;index++){ s R0e&Y  
  if(hCallWnd[index]==0){ Lq8Z!AIw>  
   hCallWnd[index]=hWnd; gm%bxr@X~  
   HotKey[index]=cKey; F~0%j}ve  
   HotKeyMask[index]=cMask; & b^*N5<Z  
   bAdded=TRUE; tEs[zo+DR-  
   KeyCount++; JI#Enh!Lv  
   break; : 1f5;]%N  
  } :tS>D5dz(  
 } $\J9F=<a  
 return bAdded; Z=5}17kA  
} a.*j8T  
//删除热键 hZ /  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )k%drdY{J'  
{ y2hFUq  
 BOOL bRemoved=FALSE; :@807OYzy  
 for(int index=0;index<MAX_KEY;index++){ k2,oyUT=S  
  if(hCallWnd[index]==hWnd){ =&g}Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $6x:aG*F  
    hCallWnd[index]=NULL; DP'Dg /D  
    HotKey[index]=0; PC(iqL8r  
    HotKeyMask[index]=0; 1?#p !;&  
    bRemoved=TRUE; 'L+BkE6+%  
    KeyCount--; vz_g2.7l\  
    break; ^3@a0J=F  
   } ~ z&A  
  } e8uIh[+ 0  
 } # yRA. ;  
 return bRemoved; U:p"IY#%  
} &Or=_5Y`  
7D_kkhN  
c]v3dHE_h  
  DLL中的钩子函数如下: K1{nxw!`  
F3|pS:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eeTaF!W  
{ F?AfB[PM  
 BOOL bProcessed=FALSE; <hC3#dNRd  
 if(HC_ACTION==nCode) 3S|;yOl#X  
 { U;dt-3?=.h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \ #c+vfq  
   switch(wParam) , p=8tf#  
   {  ^* v{t?u  
    case VK_MENU: N}<U[nh'  
     MaskBits&=~ALTBIT; 9nAK6$/  
     break; 'Mhdw}  
    case VK_CONTROL: gJ~*rWBK:  
     MaskBits&=~CTRLBIT; f]65iE?x  
     break; jY6=+9Jz5  
    case VK_SHIFT: BU{ V,|10a  
     MaskBits&=~SHIFTBIT; )7mJ+d[  
     break; RKb3=} *C  
    default: //judge the key and send message y:zT1I@>  
     break; [!efQap  
   } h#;K9#x6  
   for(int index=0;index<MAX_KEY;index++){ <Y'YpH`l  
    if(hCallWnd[index]==NULL) vX24W*7  
     continue; /4BXF4ksi,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `l#$l3v+  
    { r>@/XYK&\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !+ hgKZ]  
     bProcessed=TRUE; \-id[zKb  
    } MpvA--  
   } fT~<C {  
  } lq9h Dn[p  
  else if((lParam&0xc000ffff)==1){ //有键按下 6_><W"r:]  
   switch(wParam) q)i(wEdUZ  
   { I<-" J^2  
    case VK_MENU: /kVc7 LC  
     MaskBits|=ALTBIT; n=MYv(Pp}  
     break; 'J2P3t  
    case VK_CONTROL: -^"?a]B  
     MaskBits|=CTRLBIT; &y+*3,!n8  
     break; 'F~SNIay  
    case VK_SHIFT: z:7F5!Z  
     MaskBits|=SHIFTBIT; R7b*(33  
     break; DYl{{L8@  
    default: //judge the key and send message tC~itU=V  
     break; He23<hd!  
   } ?OdA`!wE  
   for(int index=0;index<MAX_KEY;index++){ $QnfpM%+=  
    if(hCallWnd[index]==NULL) !+l, m8Hly  
     continue; E:OeU_\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B 1.@K}  
    { N^at{I6C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #<3\}*/  
     bProcessed=TRUE; ir?9{t/()  
    } :UciFIa  
   } cv1L!Ce,  
  } [D\AVx&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t$|6} BX  
   for(int index=0;index<MAX_KEY;index++){ 6*Qpq7Ml  
    if(hCallWnd[index]==NULL) wUndNE   
     continue; Ey%NqOs0#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {`55nwd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y9<Fv|Ric  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &[pw LYf7  
   } ?Fv(4g  
  } c5pG?jr+d  
 } n4,J#h/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Op~+yMef  
} `6su_8Hno  
(%, '  
  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: (H^o8J   
6 [E"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O:)@J b2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :f:C*mYvu  
hI 0l2OE  
  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: K6oLSr+EAK  
;GSj }Nq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^lj>v}4fkW  
{ 4G ?k31,k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C? S%fF  
 { vD t? N9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M:E#}(  
  SaveBmp(); ipG+qj/=  
  return FALSE; j*}xe'#  
 } @}:(t{>;e7  
 …… //其它处理及默认处理 `PfC:L  
} 8wOPpdc  
}$jIvb,3?  
uDR(^T{g#  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Vv]mME@  
1)y}.y5S  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 {;r5]wimb  
qS>el3G  
  二、编程步骤 Zlhr0itf  
G].Z| Z9  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; gqd#rjtfz  
tEl_A"^e  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; KV2X[1  
KC'{>rt7  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; = 4L.  
" PPwJ/L(  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Sj\8$QIXC  
&I8ZVtg  
  5、 添加代码,编译运行程序。 lf 3W:0 K  
$l=m?r=  
三、程序代码 V! p;ME  
I5{SC-7  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pB`<4+"9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Gwe9< y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ c{[WOrA~#  
#if _MSC_VER > 1000 f`cO5lP/:)  
#pragma once x\WKsc  
#endif // _MSC_VER > 1000 .3#Tw'% G  
#ifndef __AFXWIN_H__ LvS`   
#error include 'stdafx.h' before including this file for PCH occ}|u  
#endif q-'zZ#  
#include "resource.h" // main symbols HzV3O-Qz]  
class CHookApp : public CWinApp *=rl<?tX  
{ idHBz*3~ps  
 public: 74_ji!  
  CHookApp(); t5S S]  
  // Overrides xpae0vw  
  // ClassWizard generated virtual function overrides d}1R<Q;F  
  //{{AFX_VIRTUAL(CHookApp) ] '..G-  
 public: 8WMC ~  
  virtual BOOL InitInstance(); /}Max@.`  
  virtual int ExitInstance(); c(fwl`y !x  
  //}}AFX_VIRTUAL yo5|~"yZY  
  //{{AFX_MSG(CHookApp) b$hQB090  
  // NOTE - the ClassWizard will add and remove member functions here. B|tP3<  
  // DO NOT EDIT what you see in these blocks of generated code ! V<b"jCXI  
  //}}AFX_MSG P6 9S[aqW  
  DECLARE_MESSAGE_MAP() ` 6PdMvF  
}; cYK3>p A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); O:4.xe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =73wngw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8d-_'MXk3  
BOOL InitHotkey(); =4G9ev 4  
BOOL UnInit(); g94NU X  
#endif _|3n h;-m  
UhNeY{6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. I<DS07K  
#include "stdafx.h" !I@"+oY<  
#include "hook.h" > #SQDVFf  
#include <windowsx.h> *+5AN306  
#ifdef _DEBUG Y>r9"X| &H  
#define new DEBUG_NEW D+tn<\LF  
#undef THIS_FILE f5AK@]4G  
static char THIS_FILE[] = __FILE__; bV}43zI.  
#endif WSL_Dc  
#define MAX_KEY 100 WL<Cj_N_{H  
#define CTRLBIT 0x04 {A{=RPL  
#define ALTBIT 0x02 [E+#+-n7  
#define SHIFTBIT 0x01 Eg>MG87  
#pragma data_seg("shareddata") Jjv, )@yo  
HHOOK hHook =NULL; S~hNSw (-  
UINT nHookCount =0; c8A //  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~)ls.NXI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v*kTTaU&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k/Z}nz   
static int KeyCount =0; $5l8V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift n>{ >3?  
#pragma data_seg() +v/_R{ M  
HINSTANCE hins; WI ' ;e4  
void VerifyWindow(); C*=#=.~~{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s/8>(-H#  
//{{AFX_MSG_MAP(CHookApp) jT%k{"+>+?  
// NOTE - the ClassWizard will add and remove mapping macros here. 4Y[tx]<  
// DO NOT EDIT what you see in these blocks of generated code! >J+hu;I5  
//}}AFX_MSG_MAP IZ "d s=w  
END_MESSAGE_MAP() *22}b.)  
wj /OYnMw  
CHookApp::CHookApp() 1 %K^(J;  
{ Qn_*(CSp  
 // TODO: add construction code here, 1jpcoJ@s  
 // Place all significant initialization in InitInstance mJp)nF8r~  
} 6Dwj^e0  
v<$a .I(  
CHookApp theApp; crG+BFi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #}3$n/  
{ yc?+L ;fN  
 BOOL bProcessed=FALSE; {fmSmD  
 if(HC_ACTION==nCode) 0& 54xP  
 { NLf6}  
  if((lParam&0xc0000000)==0xc0000000){// Key up A70x+mjy^T  
   switch(wParam) 9v=5x[fE  
   { ^^1rjh1I  
    case VK_MENU: T_i]y4dg  
     MaskBits&=~ALTBIT; q3<Pb,Z  
     break; 1--_E,Su>  
    case VK_CONTROL: %#7Yr(&  
     MaskBits&=~CTRLBIT; XDRw![H,~  
     break; bVaydJ*  
    case VK_SHIFT: ;rC)*=4#  
     MaskBits&=~SHIFTBIT; bS[;d5  
     break;  E|P  
    default: //judge the key and send message k` cz$>  
     break;  #-r,;  
   } /{QR:8}-Q  
   for(int index=0;index<MAX_KEY;index++){ ~H`~&?  
    if(hCallWnd[index]==NULL) FwKT_XkY  
     continue; p;$Vw6W=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w a7)  
    { KsZd.Rf=@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U51C /A  
     bProcessed=TRUE; KG=h!]Meq  
    } '[V}]Z>-  
   } ]n _OQ)VO  
  } jzt$  
  else if((lParam&0xc000ffff)==1){ //Key down _8]hn[  
   switch(wParam) p}I ,!~}  
   { L Vt{`   
    case VK_MENU: V}_M\Y^^;  
     MaskBits|=ALTBIT; i^ `]TOP  
     break; 6_1v~#  
    case VK_CONTROL: `_M*2(rt  
     MaskBits|=CTRLBIT; tgz  
     break; C^2J<  
    case VK_SHIFT: pH!e<m  
     MaskBits|=SHIFTBIT; jr,j1K@_t  
     break; z86[_l:  
    default: //judge the key and send message gK7bP'S8H  
     break; _ljdo`j#N  
   } u6tD5Y  
   for(int index=0;index<MAX_KEY;index++) BTi:Bcv k  
   { g<d#zzP"T  
    if(hCallWnd[index]==NULL) ]m&cVy&  
     continue; u^5X@ .  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5^:N]Mp"  
    { ~m@v ~=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "'i" @CR  
     bProcessed=TRUE; uj 6dP  
    } { [Sd[P  
   } x.J% c[Q8  
  } $d:>(_p=A  
  if(!bProcessed){ HH`G/(a  
   for(int index=0;index<MAX_KEY;index++){ p:g`K# [F  
    if(hCallWnd[index]==NULL) rwYlg:  
     continue; g3*" ^C2=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kta`[%KmIZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); AC'$~4  
   } ~ 8hAmM  
  } YTWlR]Tr6?  
 } z^xrB$8 u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &tKr ?l  
} Jng,:$sZ  
iobL6SUZ  
BOOL InitHotkey() 4&TTPcSt;  
{ Nhq& Sn2  
 if(hHook!=NULL){ r&qF v)0!`  
  nHookCount++; MGoYL \  
  return TRUE; "w0[l"3 V  
 } Av3qoH)[<  
 else  Xn<~ln  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {i}z|'!  
  if(hHook!=NULL) eYJ6&).F  
   nHookCount++; y:\ ^[y IQ  
  return (hHook!=NULL); wTT_jyH)  
} HW0EPJ  
BOOL UnInit() kB`t_`7f  
{ ,VtrQb)Yf  
 if(nHookCount>1){ k{fTq KS%h  
  nHookCount--; Lbo8> L(  
  return TRUE; ]yzqBbV  
 } 7.G1Q]6/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +W=  
 if(unhooked==TRUE){ o\Ocu>:  
  nHookCount=0; H[K(Tt4<&  
  hHook=NULL; .Vy*p")"  
 } {u/G!{N$  
 return unhooked; =x8F!W}Bt<  
} H*SEzVb  
0)c9X[sG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'eKvt5&@  
{ co <ATx  
 BOOL bAdded=FALSE; st8=1}:&\  
 for(int index=0;index<MAX_KEY;index++){ %TO=]>q  
  if(hCallWnd[index]==0){ 32DSZ0  
   hCallWnd[index]=hWnd; Y5J}*`[Mr  
   HotKey[index]=cKey; `vkNp8|  
   HotKeyMask[index]=cMask; T2;%@Ghc  
   bAdded=TRUE; c^N'g!on  
   KeyCount++; 37 #|X*L  
   break; 0zSRk]i.f  
  } $6&P 69<  
 } bzI!;P1&  
 return bAdded; 41pk )8~pt  
}  zw13Tu  
u!&w"t61Nd  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jafIKSD]%  
{ D][e uB  
 BOOL bRemoved=FALSE; Xp(e/QB  
 for(int index=0;index<MAX_KEY;index++){ |*~=w J_  
  if(hCallWnd[index]==hWnd){ Bl)znJ^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -uho;  
    hCallWnd[index]=NULL; 8{mQmG4  
    HotKey[index]=0; a6UW,n"n  
    HotKeyMask[index]=0; w"-'  
    bRemoved=TRUE; Lk%u(duU^  
    KeyCount--; R.(cGZS  
    break; 2r3]DrpJ  
   } bzz{ p1e  
  } $_2S,3 }  
 } /F>\-    
 return bRemoved; RVlAWw(  
} IEi E6z]L(  
&VY(W{\eY  
void VerifyWindow() Hk65c0  
{ D.e4S6\&  
 for(int i=0;i<MAX_KEY;i++){ F TB@70  
  if(hCallWnd!=NULL){ s_(%1/{  
   if(!IsWindow(hCallWnd)){ 9J"Y   
    hCallWnd=NULL; 3 cd5 g  
    HotKey=0; R~z@voM*<  
    HotKeyMask=0; Q?Au.q],  
    KeyCount--; }]-SAM  
   } Tk9/1C{8  
  } {gSR49!Q  
 } /}~; b#t  
} 2r+@s g  
D,aJ`PK~  
BOOL CHookApp::InitInstance() wH:'5+u:6  
{ QK+s}ny  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ov vM)?^#  
 hins=AfxGetInstanceHandle(); n&?]GyQ  
 InitHotkey(); HvITw%`  
 return CWinApp::InitInstance(); *{5L*\AZ  
} |+?ABPk"  
-0KQR{LI  
int CHookApp::ExitInstance() C*e) UPK`  
{ #}^ kMD >  
 VerifyWindow(); QOG S` fh  
 UnInit(); G\ twx ;  
 return CWinApp::ExitInstance(); 97H2hYw9l  
} |51z&dG  
R/H ?/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~I0I#_$'P  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +C~,q{u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Fm\ h883\  
#if _MSC_VER > 1000 oR.KtS$uh  
#pragma once nwd 02tu  
#endif // _MSC_VER > 1000 w!NtN4>  
Ji7%=_@'-#  
class CCaptureDlg : public CDialog >+v)^7c  
{ #;F1+s<|QJ  
 // Construction / jI>=:z  
 public: MB<oWH[e)  
  BOOL bTray; H79|%@F"  
  BOOL bRegistered; Q+ ;6\.#r  
  BOOL RegisterHotkey(); &`7tX.iMlh  
  UCHAR cKey; =bUVGjr%96  
  UCHAR cMask; JGaS`fKSk  
  void DeleteIcon(); A[lkGQtS4  
  void AddIcon(); IX eb6j8  
  UINT nCount; w.qpV]9>  
  void SaveBmp(); a;p3Me7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $'}:nwq6x  
  // Dialog Data A"S{W^iL  
  //{{AFX_DATA(CCaptureDlg) )W&H{2No  
  enum { IDD = IDD_CAPTURE_DIALOG };  EthnI7Y  
  CComboBox m_Key; N|eus3\E  
  BOOL m_bControl; w{[OtGIi3  
  BOOL m_bAlt; Q!Rknj 2  
  BOOL m_bShift; umXa   
  CString m_Path; Y_&D W4  
  CString m_Number; mDmy637_  
  //}}AFX_DATA wVCZ=\L}  
  // ClassWizard generated virtual function overrides 'xAfcP[^  
  //{{AFX_VIRTUAL(CCaptureDlg) YPAMf&jEF  
 public: 1F'j .1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); be`\ O  
 protected: >JVZ@ PV H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |+//pGx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l]whL1N3  
  //}}AFX_VIRTUAL C7&4,],  
  // Implementation vMJv.O>HW  
 protected: xW*L^97 ;  
  HICON m_hIcon; bit&H  
  // Generated message map functions XGZ1a/x;s  
  //{{AFX_MSG(CCaptureDlg) Wa~'p+<c~b  
  virtual BOOL OnInitDialog(); S?nXpYr  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1R)4[oYN\<  
  afx_msg void OnPaint(); ;5 cg<~t  
  afx_msg HCURSOR OnQueryDragIcon(); vX})6O  
  virtual void OnCancel(); ^- T!(P:  
  afx_msg void OnAbout(); Klh7&HzR  
  afx_msg void OnBrowse(); Q9)/INh  
  afx_msg void OnChange(); I9Af\ k|^  
 //}}AFX_MSG ny17(Y =  
 DECLARE_MESSAGE_MAP() I&|%Fn  
}; fB[I1Z  
#endif uW!',"0ER  
yyfm  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O-6848iCX  
#include "stdafx.h" F!jYkDY  
#include "Capture.h" _*B]yz6z  
#include "CaptureDlg.h" tUl#sqN_{  
#include <windowsx.h> XRVE8v+  
#pragma comment(lib,"hook.lib") 2SEfEkk  
#ifdef _DEBUG A7DEAT))4L  
#define new DEBUG_NEW zghUwW|K  
#undef THIS_FILE h9c54Ux  
static char THIS_FILE[] = __FILE__; EY;C5P4  
#endif N ~L3 9  
#define IDM_SHELL WM_USER+1 PiXegh WH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =mYY8c Yl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GQ ZEMy7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r> 4.{\ C  
class CAboutDlg : public CDialog Z8tQ#Pu{  
{ ,tv P"@d  
 public: Ua]shSjyI  
  CAboutDlg(); m&jh7)V  
  // Dialog Data Z8+{ -  
  //{{AFX_DATA(CAboutDlg) k$?zh$  
  enum { IDD = IDD_ABOUTBOX }; .)|r!X  
  //}}AFX_DATA L=ZKY  
  // ClassWizard generated virtual function overrides ]&w>p#_C  
  //{{AFX_VIRTUAL(CAboutDlg) cf?*6q?n  
 protected: ,TaaXI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w+ gA3Dg  
  //}}AFX_VIRTUAL #>C.61Fx  
  // Implementation K5No6dsD  
 protected:  M]:4X_  
  //{{AFX_MSG(CAboutDlg) L,V\g^4$K  
  //}}AFX_MSG fgYdKv8  
  DECLARE_MESSAGE_MAP() ,  A?o  
}; Au,xIe!t  
% \Nfj) 9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dQLR%i#P8  
{ 74hGkf^S  
 //{{AFX_DATA_INIT(CAboutDlg) ;=>4 '$8  
 //}}AFX_DATA_INIT / 2>\Z(  
} !Vl>?U?AN  
p*E_Po  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (5rH 72g(  
{ FI{9k(  
 CDialog::DoDataExchange(pDX); _svY.p s*  
 //{{AFX_DATA_MAP(CAboutDlg) k/hE68<6i  
 //}}AFX_DATA_MAP K*jV=lG  
} 0G?0 Bo  
FglCqO}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @1ZLr  
 //{{AFX_MSG_MAP(CAboutDlg) <X~ X#9V  
 // No message handlers R4v)}`x  
 //}}AFX_MSG_MAP kb{h`  
END_MESSAGE_MAP() _!6~o>  
2 >G"A  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) pH5"g"e1  
: CDialog(CCaptureDlg::IDD, pParent) A$ v Cm  
{ j*aN_UTr3  
 //{{AFX_DATA_INIT(CCaptureDlg) :[P>e ox  
  m_bControl = FALSE; +O>1 Ed  
  m_bAlt = FALSE; tep_g4CQR_  
  m_bShift = FALSE; J&4LyIpQ  
  m_Path = _T("c:\\"); Ex^|[iV  
  m_Number = _T("0 picture captured."); ,!U 5;  
  nCount=0; i~:FlW]  
  bRegistered=FALSE; A7SBm`XJ)p  
  bTray=FALSE; v`#T)5gl-  
 //}}AFX_DATA_INIT 9NLO{kN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 IBm&a^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |9. `qv  
} C*Avu  
^,[V;3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2ijw g~_@  
{ u|h>z|4lJj  
 CDialog::DoDataExchange(pDX); j;@7V4'  
 //{{AFX_DATA_MAP(CCaptureDlg) Rr+Y::E  
  DDX_Control(pDX, IDC_KEY, m_Key); z 17  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 99 /fI  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wjYwQ=y5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j.OPDe{LU  
  DDX_Text(pDX, IDC_PATH, m_Path); 'V=w?G 5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); P<yd  
 //}}AFX_DATA_MAP 2^N 4(  
} 7Fb |~In<Z  
ma.yI};$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -~T?xs0_  
//{{AFX_MSG_MAP(CCaptureDlg) R4=n">>Q  
 ON_WM_SYSCOMMAND() Pda(O;aNU  
 ON_WM_PAINT() =B O} hk  
 ON_WM_QUERYDRAGICON() vhiP8DQ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) oyV@BHJO@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qYLOq `<f  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7Wub@Mp  
//}}AFX_MSG_MAP xh Sp<|X_  
END_MESSAGE_MAP() &scHyt  
|NFX"wv:c<  
BOOL CCaptureDlg::OnInitDialog() p\5DW'  
{ @4dB$QF`&  
 CDialog::OnInitDialog(); @A6 P[r  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6+HpN"?e  
 ASSERT(IDM_ABOUTBOX < 0xF000); PK^{WF}L;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mf]1mG})  
 if (pSysMenu != NULL) N9IBw',  
 { >en,MT|  
  CString strAboutMenu; D/pc)3Ofe  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `h+ia/  
  if (!strAboutMenu.IsEmpty()) Kj;gxYD>6  
  { e -vL!&;2  
   pSysMenu->AppendMenu(MF_SEPARATOR); {~7V A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); bf ]W_I]B  
  } KMZ:$H  
 } ,&$=2<Dx  
 SetIcon(m_hIcon, TRUE); // Set big icon _:F0>=$  
 SetIcon(m_hIcon, FALSE); // Set small icon jeM %XI  
 m_Key.SetCurSel(0); XUeBK/aQ{  
 RegisterHotkey(); d7Lna^  
 CMenu* pMenu=GetSystemMenu(FALSE); xKIzEN &  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =w='qjh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @#[<5ld  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V~p/P  
 return TRUE; // return TRUE unless you set the focus to a control 3n-~+2l  
} Sgp$B:  
3}{od$3G  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V"=(I'X  
{ ]H8,}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Nb/W+& y  
 { &t1?=F,]  
  CAboutDlg dlgAbout; m3zmyw}  
  dlgAbout.DoModal(); I_66q7U"0  
 } IfF@$eO  
 else "@Ir Bi6  
 { K~Lh'6  
  CDialog::OnSysCommand(nID, lParam); # T_m|LN 7  
 } ,YzrqVY  
} ]#>;C:L  
RB7?T5G  
void CCaptureDlg::OnPaint() eZ+pZq  
{ /y/O&`X(  
 if (IsIconic()) Eshc"U  
 { F&? &8.  
  CPaintDC dc(this); // device context for painting \]pRu"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8nn%wps  
  // Center icon in client rectangle !qe ,&JL  
  int cxIcon = GetSystemMetrics(SM_CXICON); f S-(Kmh  
  int cyIcon = GetSystemMetrics(SM_CYICON); ge*(w{|x  
  CRect rect; T;/Y/Fd  
  GetClientRect(&rect); #4uuT?!  
  int x = (rect.Width() - cxIcon + 1) / 2; <n+?7`d,  
  int y = (rect.Height() - cyIcon + 1) / 2; FJ]BB4 K  
  // Draw the icon O_@  
  dc.DrawIcon(x, y, m_hIcon); z 3RD*3b  
 } ,m<t/@^]  
 else oCD#Gmr  
 { $RA8U:Q!1e  
  CDialog::OnPaint(); *N5cC#5`=  
 } y" 4Nw]kU  
} n^Co  
Ak(_![Q:q\  
HCURSOR CCaptureDlg::OnQueryDragIcon() V'[Lqe,y  
{ .Y!] {c  
 return (HCURSOR) m_hIcon; $-4OveS~B  
} aKi&2>c5>  
h>>KH*dQ  
void CCaptureDlg::OnCancel() @uru4>1_dy  
{ Z!\xVCG"q  
 if(bTray) ]P lD e8  
  DeleteIcon(); ;2lKo="  
  CDialog::OnCancel(); -"m4 A0  
} ]&l.-0jt  
JBY`Y ]V3  
void CCaptureDlg::OnAbout() ~zdHJ8tYp  
{ ,+`1/  
 CAboutDlg dlg; "VEA71  
 dlg.DoModal(); 5LJUD>f9 Z  
} /F#_~9JXG  
C*O648yz[  
void CCaptureDlg::OnBrowse() n/ ]<Bc?  
{ x\/N09  
 CString str; >kK!/#ZA  
 BROWSEINFO bi; j,@N0~D5  
 char name[MAX_PATH]; GTvp)^ h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); i-6,r[<  
 bi.hwndOwner=GetSafeHwnd(); \1k(4MWd  
 bi.pszDisplayName=name; ]xJ5}/  
 bi.lpszTitle="Select folder"; r?^[o  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8^/V2;~^,>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "'389*-  
 if(idl==NULL) O0|**Km\+  
  return; n.}A :Z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G-5wv  
 str.ReleaseBuffer(); Ps<6kQ(  
 m_Path=str; w.tQ)x1h  
 if(str.GetAt(str.GetLength()-1)!='\\') ?|Q[QP  
  m_Path+="\\"; hN(sz  
 UpdateData(FALSE); E: EXp7  
} GtYtB2U  
{z":hmt  
void CCaptureDlg::SaveBmp() (wxdT6RVm\  
{ |$$gj[+^  
 CDC dc; z&a%_ ]Q*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Q@M>DA!d^V  
 CBitmap bm; ,mpvGvAI  
 int Width=GetSystemMetrics(SM_CXSCREEN); `jl 1Q,~2r  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1_chO?&,I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); }zA kUt  
 CDC tdc; HiTn5XNf  
 tdc.CreateCompatibleDC(&dc); x2@Q5|a  
 CBitmap*pOld=tdc.SelectObject(&bm); b{:c0z<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /jBjqE;_  
 tdc.SelectObject(pOld); '%JIc~LJ  
 BITMAP btm; ["5Z =4  
 bm.GetBitmap(&btm); a(!_ 3i@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {|Ew]Wq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -}2'P)Xp  
 BITMAPINFOHEADER bih; ZS\ jbii8  
 bih.biBitCount=btm.bmBitsPixel; ?kOtK  
 bih.biClrImportant=0; YA7h! %52)  
 bih.biClrUsed=0; I/whpOg  
 bih.biCompression=0; B@R3j  
 bih.biHeight=btm.bmHeight; g>])O  
 bih.biPlanes=1; RTHe#`t  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ww8C}2g3  
 bih.biSizeImage=size; v0~'`*|&  
 bih.biWidth=btm.bmWidth; YMlnC7?_ /  
 bih.biXPelsPerMeter=0; p&Os5zw;|  
 bih.biYPelsPerMeter=0; (:JX;<-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Fpz)@0K;  
 static int filecount=0; l4 @  
 CString name; }sbh|#  
 name.Format("pict%04d.bmp",filecount++); Mq!vu!  
 name=m_Path+name; =Gka;,n  
 BITMAPFILEHEADER bfh; ;0)|c}n+.5  
 bfh.bfReserved1=bfh.bfReserved2=0; O$'BJKj-4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); vr/O%mDp  
 bfh.bfSize=54+size; ~Y- !PZ  
 bfh.bfOffBits=54; %'}zr>tx:  
 CFile bf; z_)`='&n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;S+UD~i[Bu  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jgcI|?yL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p};B*[ki  
  bf.WriteHuge(lpData,size); FXpI-?#E<  
  bf.Close(); 7~gIOu  
  nCount++; -vRZCIj!  
 } 1qEpQ.:](  
 GlobalFreePtr(lpData); RW4}n< 88  
 if(nCount==1) C'6 yt  
  m_Number.Format("%d picture captured.",nCount); yvPcD5s5  
 else <ptskbu  
  m_Number.Format("%d pictures captured.",nCount); |4=Du-e  
  UpdateData(FALSE); {FIr|R&  
} *]L(,_:"  
i,[S1g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3#=%2\  
{ utH,pGs C.  
 if(pMsg -> message == WM_KEYDOWN) C-vFl[@a0  
 { : h"Bf@3  
  if(pMsg -> wParam == VK_ESCAPE) H$M#+EfL  
   return TRUE; jH 4,-  
  if(pMsg -> wParam == VK_RETURN) COV8=E~  
   return TRUE; aP#nK  
 } f!|$!r*q  
 return CDialog::PreTranslateMessage(pMsg); =) Aav!  
} -E*VF{IG1  
gpIq4Q<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,YEwz3$5u  
{ +prr~vgE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *0EB{T1  
  SaveBmp(); f WUFCbSU  
  return FALSE; j %3wD2 l  
} cph&\ V2jt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e`N/3q7  
 CMenu pop; <)f1skJsP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); NCid`a$  
 CMenu*pMenu=pop.GetSubMenu(0); dX720/R  
 pMenu->SetDefaultItem(ID_EXITICON); 5,i0QT"  
 CPoint pt; /h.hFM/  
 GetCursorPos(&pt); " [Z'n9C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z0yPBt1W  
 if(id==ID_EXITICON) /Dmuvb|A  
  DeleteIcon(); vr:5+wew  
 else if(id==ID_EXIT) 2YS1%<-g*  
  OnCancel(); &l&B[s6[  
 return FALSE; &jbZL5  
} KOYU'hw  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PP]Z~ne0X  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =>y%Aj&4  
 AddIcon(); \dB)G<_  
 return res; M5C%(sQ$  
} \$Jz26 -n  
3 P)N,  
void CCaptureDlg::AddIcon() @4ccZ&`  
{ ,MmX(O0  
 NOTIFYICONDATA data; .%\lYk]  
 data.cbSize=sizeof(NOTIFYICONDATA); MBjo9P(  
 CString tip; `dGcjLs Iz  
 tip.LoadString(IDS_ICONTIP); 5s /fBS  
 data.hIcon=GetIcon(0); #9's^}i  
 data.hWnd=GetSafeHwnd(); 5[qCH(6  
 strcpy(data.szTip,tip); x/)o'#d$|l  
 data.uCallbackMessage=IDM_SHELL; :!cNkJa  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /x2MW5H  
 data.uID=98; WxgA{q7:  
 Shell_NotifyIcon(NIM_ADD,&data); UA%tI2  
 ShowWindow(SW_HIDE); EN\ uX!  
 bTray=TRUE; UHaY|I${U  
} DJ]GM|?  
9pehQFfH  
void CCaptureDlg::DeleteIcon() uhf% z G  
{ l ;fO]{  
 NOTIFYICONDATA data; #P^cR_|\  
 data.cbSize=sizeof(NOTIFYICONDATA); O{Y_j&1  
 data.hWnd=GetSafeHwnd(); xGBp+j1H  
 data.uID=98; LQr+)wI  
 Shell_NotifyIcon(NIM_DELETE,&data); f,s1k[w/;  
 ShowWindow(SW_SHOW); xnp5XhU  
 SetForegroundWindow(); Y/Dah*  
 ShowWindow(SW_SHOWNORMAL); &% infPI'  
 bTray=FALSE; LOPw0@  
} &4 ~C%{H3  
$z":E(oy  
void CCaptureDlg::OnChange() =D}]|ie  
{ :5 zXW;s  
 RegisterHotkey(); |PY*"Ul  
} ]?/7iM  
e5HHsR6  
BOOL CCaptureDlg::RegisterHotkey() K7jz*|2  
{ gA/8Df\G:l  
 UpdateData(); exfJm'R?n  
 UCHAR mask=0; {CVn&|}J  
 UCHAR key=0; ! ,v!7I  
 if(m_bControl) 4w)aAXK  
  mask|=4; >ow5aOlQ&  
 if(m_bAlt) 7c7:B2Lq  
  mask|=2; K[G=J  
 if(m_bShift) :TTZ@ q  
  mask|=1; !92zC._  
  key=Key_Table[m_Key.GetCurSel()]; HZ8k%X}1  
 if(bRegistered){ # 1#?k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |."thTO  
  bRegistered=FALSE; D?Y j5eOa  
 } wFHz<i!jr&  
 cMask=mask; 5j S8{d0  
 cKey=key; OqW (C  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); z}sBx 9;  
 return bRegistered; Y{v\m(D  
} +. `  I  
>i:h dcxe  
  四、小结 ^|+;~3<J  
5N'Z"C0  
  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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