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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: 0u\@-np  
  {'kL]qLg  
  一、实现方法 7^=jv~>wP  
,u2<()`8D  
  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: p2^OQK  
B=|sLs`I  
#pragma data_seg("shareddata") 'WCTjTob/  
HHOOK hHook =NULL; //钩子句柄 GXVGU-br  
UINT nHookCount =0; //挂接的程序数目 >,vuC4v-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {p iS3xBi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 j(JI$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey E}2[P b)e  
static int KeyCount =0; h+(s/o?\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X ii#Qtd.  
#pragma data_seg() j"s(?  
Cx~z^YP'  
  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。 8t!"K_Mkx  
#u@!O%MJ  
  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: Rby7X*.-v  
bxq`E!]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cgOoQP/#  
cKey,UCHAR cMask) v^ G5 N)F  
{ ?VsZo6Z"  
 BOOL bAdded=FALSE; ERjf.7)d  
 for(int index=0;index<MAX_KEY;index++){ D(|$6J 0  
  if(hCallWnd[index]==0){ amgex$  
   hCallWnd[index]=hWnd; N0C5FSH  
   HotKey[index]=cKey; rC16?RovQ@  
   HotKeyMask[index]=cMask; -X \v B  
   bAdded=TRUE; 7F\g3^ z9`  
   KeyCount++; oR)7 \;g  
   break; >w2u  
  } |0-L08DW  
 } * =l9gv&  
 return bAdded; + aF jtb  
} !ZW0yCwLQ  
//删除热键 nE84W$\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9qA_5x%"%u  
{ >2/zL.O  
 BOOL bRemoved=FALSE; mgWtjV 8  
 for(int index=0;index<MAX_KEY;index++){ jXf-+ ;ZQ  
  if(hCallWnd[index]==hWnd){ W+X zU"l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f?6=H^_>  
    hCallWnd[index]=NULL; bX1ip2X lk  
    HotKey[index]=0; &IYkeGQr  
    HotKeyMask[index]=0; }I]q$3 .  
    bRemoved=TRUE; =fPO0Ot;  
    KeyCount--; DJ^JUVi  
    break; oP6G2@3P/  
   } !k63 `(Ti  
  } oL;/Qan  
 } 9HP--Z=  
 return bRemoved; H@:@zD!G[  
} :JYOC+#q7  
] W_T(C*  
OH w6#N$\  
  DLL中的钩子函数如下: edQ><lz  
jG#sVK]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) iVcBD0 q)  
{ X1"nq]chGy  
 BOOL bProcessed=FALSE; iDsjIW\j  
 if(HC_ACTION==nCode) 9^tyjX2  
 { nDvWOt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 u[DV{o  
   switch(wParam) n9^zAcUbAW  
   {  \+\h<D-5  
    case VK_MENU: K0]Wb=v  
     MaskBits&=~ALTBIT; M*N8p]3Cq  
     break; pifgt  
    case VK_CONTROL: Fh'Jb*|Q  
     MaskBits&=~CTRLBIT; h! <8=V(  
     break; $&!U&uMt  
    case VK_SHIFT: Tp7?:YY|  
     MaskBits&=~SHIFTBIT; .(-3L9T}  
     break; m 78PQx H  
    default: //judge the key and send message n|.;g!QDA  
     break; o&zV8DE_v  
   } jX%Q  
   for(int index=0;index<MAX_KEY;index++){ z$NLFJvy_-  
    if(hCallWnd[index]==NULL) tj3p71%  
     continue; BG"6jQh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R)=<q]Ms  
    { ?:E;C<Ar  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vuf|2!kh/  
     bProcessed=TRUE; D<`X B*  
    } yT4|eHl  
   } 3A5" %  
  } ;g9+*$Gw  
  else if((lParam&0xc000ffff)==1){ //有键按下 =6$(m}(74  
   switch(wParam) bQ%^l#H_n'  
   { `W9_LROD  
    case VK_MENU: "Xqj%\  
     MaskBits|=ALTBIT;  ulQE{c[  
     break; &V"&SV>}  
    case VK_CONTROL: *sTQ9 Kr  
     MaskBits|=CTRLBIT; ]:;gk&P  
     break; bpzA ' g>  
    case VK_SHIFT: gS%J`X$  
     MaskBits|=SHIFTBIT; @;0Ep 0[  
     break; -3fvO~  
    default: //judge the key and send message P1kd6]s  
     break; [,dsV d  
   } :MVD83?4  
   for(int index=0;index<MAX_KEY;index++){ >Ry4Cc  
    if(hCallWnd[index]==NULL) OQq7|dZu  
     continue; SO)??kQ{U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eXYR/j<8  
    { L`\ILJz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ll#PCgIm  
     bProcessed=TRUE; iAN#TCwLT7  
    } ~4M]SX1z  
   } ,oC r6 ]  
  } i< ih :  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _ |; bh  
   for(int index=0;index<MAX_KEY;index++){ i[<O@Rb  
    if(hCallWnd[index]==NULL) 6Z$T& Ul{  
     continue; W +S>/`N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `{ /tx!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y& )z\8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >g?,BK@  
   } Q_dFZ  
  } P|\,kw>l  
 } mUjA9[@   
 return CallNextHookEx( hHook, nCode, wParam, lParam );  oDC3AK&  
} <AVpFy  
W`Soa&9  
  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: ZA!vxQ?P,  
$j:0*Z=>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JwO+Dd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m*'#`vIbb  
* .e^s3q$  
  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: dG| iA]  
aU3&=aN+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M1^pW 63  
{ qAm%h\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (HTVSC%=  
 { c[5>kQ-nq  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0<Y)yNsV  
  SaveBmp(); +,smjg:O  
  return FALSE; xZkLN5I{  
 } *"#>Ov>  
 …… //其它处理及默认处理 3Ry?{m^  
} ,Zdc  
Ei#"r\q j_  
8Hhe&B  
  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。 e0D;]  
dLAElTg  
  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。 }, ]W/  
AIE)q]'Q  
  二、编程步骤 eC1cE  
?0%lB=qQ  
  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[6A~iC_  
`Z{7Ut^)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fD!O aK  
|h.he_B+7  
  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; @A)gsDt9A  
/_LUys/0  
  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; t?/#:J*_7  
% $ 5hC9  
  5、 添加代码,编译运行程序。 ~<|xS  
N%`ikdaTd  
三、程序代码 *u-TNg  
xbIxtZm  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2lGq6Au:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) r:u5+A  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ JK_sl>v.7  
#if _MSC_VER > 1000 zRB1V99k  
#pragma once bJ9>,,D  
#endif // _MSC_VER > 1000 f$P pFSY4  
#ifndef __AFXWIN_H__ g6N{Z e Wg  
#error include 'stdafx.h' before including this file for PCH w7O(I"  
#endif A }dl@  
#include "resource.h" // main symbols ;'nu9FU*O  
class CHookApp : public CWinApp {dA#r>z\1  
{ 5:O"T  
 public: & K7+V  
  CHookApp(); }lWEbQ)(!  
  // Overrides 9#1lxT4%  
  // ClassWizard generated virtual function overrides cP(/+ /9  
  //{{AFX_VIRTUAL(CHookApp) BM:je(*p  
 public: sB /*gO  
  virtual BOOL InitInstance(); Fm*O&6W\@A  
  virtual int ExitInstance(); 5^tL#  
  //}}AFX_VIRTUAL +lE 9*Gs_$  
  //{{AFX_MSG(CHookApp) yaeX-'(Fv[  
  // NOTE - the ClassWizard will add and remove member functions here. L8!xn&uyP=  
  // DO NOT EDIT what you see in these blocks of generated code ! Wvcj\2'yd  
  //}}AFX_MSG R,tR{| 8  
  DECLARE_MESSAGE_MAP() wWwY .}j  
}; 3C.bzw^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P_w+p"@m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8on2 BC2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p7 |~x@q+  
BOOL InitHotkey(); :U?Kwv8s  
BOOL UnInit(); Q~uj:A]n<  
#endif G:f]z;Xdp  
o-/Xa[yC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9!PJLI=D  
#include "stdafx.h" h4ZrD:D0\  
#include "hook.h" BjJ+~R  
#include <windowsx.h> m\j'7mZ1  
#ifdef _DEBUG 6N6d[t"  
#define new DEBUG_NEW 8W#whK2El  
#undef THIS_FILE (0^u  
static char THIS_FILE[] = __FILE__; :)bm+xWFF  
#endif 2E;*kKw[  
#define MAX_KEY 100 z$;z&X$j  
#define CTRLBIT 0x04 DN!:Rm uc  
#define ALTBIT 0x02 oc>,5 x  
#define SHIFTBIT 0x01 M,:GMO:?a  
#pragma data_seg("shareddata") ?-J\~AXL  
HHOOK hHook =NULL; w,D(zk$   
UINT nHookCount =0; ;Cm%<vW4!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6EJ,czt(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q;SMwCB0M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey HJM-;C](  
static int KeyCount =0; ]*Zg(YA  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift jF{zcYU  
#pragma data_seg() Z&YW9de@  
HINSTANCE hins; u|APx8?"o  
void VerifyWindow(); N }Z"$4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Q+gQ"l,95  
//{{AFX_MSG_MAP(CHookApp) P)ZGNtO9fG  
// NOTE - the ClassWizard will add and remove mapping macros here. K5'@$Km  
// DO NOT EDIT what you see in these blocks of generated code! W~FcU+a  
//}}AFX_MSG_MAP  >Xh 9{/o  
END_MESSAGE_MAP() :*#I1nb$  
=((#kDrN  
CHookApp::CHookApp() 'ym/@h7h  
{ G^5}T>TV  
 // TODO: add construction code here, * r$(lf  
 // Place all significant initialization in InitInstance StA5h+[m  
} $ ^m_M.1  
jbGP`b1_  
CHookApp theApp; KE6[u*\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H/Y ZwDx,i  
{ (+(YO\ng6  
 BOOL bProcessed=FALSE; ,J~kwJ$L  
 if(HC_ACTION==nCode) Tw);`&Ulo  
 { PO ]z'LD  
  if((lParam&0xc0000000)==0xc0000000){// Key up M+9G^o)u  
   switch(wParam) Whod_Uk  
   { 2t*@P"e!  
    case VK_MENU: "\U$aaF  
     MaskBits&=~ALTBIT; o"J}@nF  
     break; O8r9&Nv  
    case VK_CONTROL: w SBDJvI  
     MaskBits&=~CTRLBIT; SX$v&L<  
     break; c{7!:hi`x  
    case VK_SHIFT: p.n+m[  
     MaskBits&=~SHIFTBIT; {w1sv=$+  
     break; 7;+:J;xf66  
    default: //judge the key and send message Zw` Xg@;xP  
     break; fXEF]C  
   } s -~Tf|  
   for(int index=0;index<MAX_KEY;index++){ -!k"*P  
    if(hCallWnd[index]==NULL) <9B\('  
     continue; hj4Kv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u+~Ta  
    { N{ @B@]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D<]z.33  
     bProcessed=TRUE; -P^ 6b(  
    } _ ^r KOd  
   } {YT!vD9.  
  } &ScADmZP^d  
  else if((lParam&0xc000ffff)==1){ //Key down oyiEOC  
   switch(wParam) Jo1n>Mo-j  
   { X~T"n<:a>  
    case VK_MENU: Yw vX SA  
     MaskBits|=ALTBIT; M`-.0  
     break; cF7I  
    case VK_CONTROL: m\)z& hv<r  
     MaskBits|=CTRLBIT; F\ yxXOI  
     break; "}Of f  
    case VK_SHIFT: CD;C z*c  
     MaskBits|=SHIFTBIT; MD%_Z/NL  
     break; t-)C0<  
    default: //judge the key and send message l}A8  
     break; .;8T*  
   } 9# IKb:9k  
   for(int index=0;index<MAX_KEY;index++) GNlP]9wX  
   { w(zlHj  
    if(hCallWnd[index]==NULL) S~.:B2=5K  
     continue; nb9qVuAGU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^w/_hY!4/  
    { qM~ev E$%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SxdH %agM  
     bProcessed=TRUE; /pt%*;H  
    } \cP\I5IW:s  
   } >gtKyn]  
  } .^6"nnfA#  
  if(!bProcessed){ 2;VggPpT  
   for(int index=0;index<MAX_KEY;index++){ Z?kLAhy!  
    if(hCallWnd[index]==NULL) C: @T5m  
     continue; WLma)L`L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9 ,=7Uh#7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -{dsl|Dl  
   } `9}\kn-</8  
  } - &Aw] +  
 } jO)UK.H#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &`[y]E'  
} </ 3 Shq  
]([:"j  
BOOL InitHotkey() 4mq+{c0  
{ 2"*7H S  
 if(hHook!=NULL){ n7>CK?25  
  nHookCount++; 6r4o47_t8#  
  return TRUE; S-&[Tp+N  
 } q-P$ \":  
 else uDJi2,|n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~3< Li}W  
  if(hHook!=NULL) {p&L wTnf  
   nHookCount++; [XK Ke  
  return (hHook!=NULL); TR/'L!EE  
} r<,W{Va  
BOOL UnInit() ^tc2?T  
{ 5}@6euT5$  
 if(nHookCount>1){ -`x$a&}  
  nHookCount--; JY8wo5H  
  return TRUE; Fsv:SL+5  
 } c+|,q m  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Hg\+:}k&9  
 if(unhooked==TRUE){ ]V \qX+K  
  nHookCount=0; $R4[TQY).!  
  hHook=NULL; He^u+N@B  
 } =X6WK7^0  
 return unhooked; ?9 hw]Q6r}  
} 1:%HE*r  
uKHkC.g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GP6-5Y"8  
{ }JyWy_Y  
 BOOL bAdded=FALSE; m&(yx| a4+  
 for(int index=0;index<MAX_KEY;index++){ `KBgVhS>  
  if(hCallWnd[index]==0){ OoL#8R  
   hCallWnd[index]=hWnd; STmn%&  
   HotKey[index]=cKey; I%.KFPV  
   HotKeyMask[index]=cMask; *$mDu,'8  
   bAdded=TRUE; oace!si  
   KeyCount++; ZWH?=Bk:  
   break; W&23M26"{  
  } *T\- iICw  
 } 0O+[z9  
 return bAdded; YcW[BMy5h  
} gU1E6V-Jm  
-S5M>W.Qb{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vX|ZPn#  
{ # ~SuL3  
 BOOL bRemoved=FALSE; R?@F%J;tx  
 for(int index=0;index<MAX_KEY;index++){ *IL x-D5qr  
  if(hCallWnd[index]==hWnd){ h$7rEs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oxT..=-  
    hCallWnd[index]=NULL; h >V8YJ  
    HotKey[index]=0; iy_'D  
    HotKeyMask[index]=0; 0?59o!@h  
    bRemoved=TRUE; A??(}F L  
    KeyCount--; /Ud<4j-  
    break; LnZzY0  
   } qd\5S*Z1  
  } Cj^:8 ?%  
 } Gu} `X23  
 return bRemoved; `|@#~  
} A;VjMfoB  
&Ohm]g8{2  
void VerifyWindow() FRa@T N/Ic  
{ P9h]B u  
 for(int i=0;i<MAX_KEY;i++){ rrBu6\D  
  if(hCallWnd!=NULL){ :l<)p;\  
   if(!IsWindow(hCallWnd)){ r_/=iYYJ  
    hCallWnd=NULL; z<2!|  
    HotKey=0; t}r`~AEa!  
    HotKeyMask=0; &E|2-)  
    KeyCount--; H>Wi(L7  
   } #Ezq}F8Y  
  } F ^& Rg  
 } |Y#KMi ~  
} :.KN;+tP  
q0|u vt"  
BOOL CHookApp::InitInstance() ;4XvlcGo  
{ Bc%A aZ0x  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e45gjjts  
 hins=AfxGetInstanceHandle(); -WiOs;2~/  
 InitHotkey(); YNV!(>\GE  
 return CWinApp::InitInstance(); LB*qL  
} V mxVE=l  
HsrIw  
int CHookApp::ExitInstance() c"qaULY  
{ E+wd9/;  
 VerifyWindow(); f4.k%|]  
 UnInit(); lR] z8 &  
 return CWinApp::ExitInstance(); g$C-G5/bjD  
} D5]4(]k&  
F\&Sn1>k  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =2&/Cn4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;M,u,KH)/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ C? pi8Xg  
#if _MSC_VER > 1000 +-_71rJc.  
#pragma once -"J6 |Y#8  
#endif // _MSC_VER > 1000 ="E^9!  
3I!xa*u  
class CCaptureDlg : public CDialog ~x<nz/^  
{ s|iph~W!L  
 // Construction BQYj"Wi  
 public: yKE[,"  
  BOOL bTray; ,>"rcd  
  BOOL bRegistered; &0B< iO<f  
  BOOL RegisterHotkey(); d&S4`\g?8  
  UCHAR cKey; /*g9drwaa  
  UCHAR cMask; ~"\qX+  
  void DeleteIcon(); 08)X:@ w?  
  void AddIcon(); mmk]Doy?#  
  UINT nCount; Q\(VQ1c  
  void SaveBmp(); 5f+ziiZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GA&mM   
  // Dialog Data 5~(.:RX:q  
  //{{AFX_DATA(CCaptureDlg) zJ;K4)"j  
  enum { IDD = IDD_CAPTURE_DIALOG }; HQi57QB  
  CComboBox m_Key; >7@kwj-f)  
  BOOL m_bControl; $Pa7B]A,Ae  
  BOOL m_bAlt; uK6_HvHuy  
  BOOL m_bShift; 3f'dBn5  
  CString m_Path; 3$Ecq|4J:  
  CString m_Number; $*)??uU  
  //}}AFX_DATA kOfq6[JC  
  // ClassWizard generated virtual function overrides ?f1PQ  
  //{{AFX_VIRTUAL(CCaptureDlg) |ocIp/ $  
 public: gH87e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;zy[xg.7  
 protected: ejq2]^O4c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C)^FRnb  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :uM2cc^  
  //}}AFX_VIRTUAL v IBVp  
  // Implementation Jvi"K  
 protected: c&zZsJ"~  
  HICON m_hIcon; !]bXHT&!R  
  // Generated message map functions "=~P&Mi_  
  //{{AFX_MSG(CCaptureDlg) Fy4jujP<  
  virtual BOOL OnInitDialog(); -fF1vJ7L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [~&C6pR  
  afx_msg void OnPaint(); npcB+6  
  afx_msg HCURSOR OnQueryDragIcon(); u Qy5t:!  
  virtual void OnCancel(); %9.] bd|%F  
  afx_msg void OnAbout(); KX*Hev'K  
  afx_msg void OnBrowse(); bkmW[w:M  
  afx_msg void OnChange(); -VK 6Fq  
 //}}AFX_MSG - w41Bvz0  
 DECLARE_MESSAGE_MAP() o`^GUY}  
}; H^jFvAI,8  
#endif HV:mS*e  
cv fh:~L  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "BB#[@  
#include "stdafx.h" 8+^?<FKa  
#include "Capture.h" 2u9^ )6/  
#include "CaptureDlg.h" jYwv+EXg  
#include <windowsx.h> ^{<x*/nK  
#pragma comment(lib,"hook.lib") w)bLdQ  
#ifdef _DEBUG {"33 .^=  
#define new DEBUG_NEW /EY ^ui  
#undef THIS_FILE XOl]s?6H$  
static char THIS_FILE[] = __FILE__; ; n2|pC^  
#endif YT;b$>1v  
#define IDM_SHELL WM_USER+1 3#>;h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U^_'e_)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yQwj [  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c"aiZ(aP  
class CAboutDlg : public CDialog j!r 4p,  
{ Ph&AP*Fq  
 public: 3[Pa~]yS  
  CAboutDlg(); YxMOr\B  
  // Dialog Data ]a% *$TF  
  //{{AFX_DATA(CAboutDlg) T!6H5>zA  
  enum { IDD = IDD_ABOUTBOX }; 1j*I`xZ  
  //}}AFX_DATA '[shY  
  // ClassWizard generated virtual function overrides _E5%Px5>L  
  //{{AFX_VIRTUAL(CAboutDlg) QZufQRfr{  
 protected: fgFBOpG%Gq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1jZ:@M :  
  //}}AFX_VIRTUAL rI&GM |  
  // Implementation #8;|_RU  
 protected: {8M=[4_`l  
  //{{AFX_MSG(CAboutDlg) l*[.  
  //}}AFX_MSG myH:bc>6  
  DECLARE_MESSAGE_MAP() o{*8l#x8  
}; pL$UI3VCP  
7> -y,?&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m:TS .@p  
{ bhXH<=  
 //{{AFX_DATA_INIT(CAboutDlg) U*8;ZXi  
 //}}AFX_DATA_INIT ? WWnt^  
} 3j.Ft*SV  
v _Bu  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "Kk3#  
{ 8F0+\40  
 CDialog::DoDataExchange(pDX); Auhw(b>}TW  
 //{{AFX_DATA_MAP(CAboutDlg) w<_.T#  
 //}}AFX_DATA_MAP fys@%PZq  
} qs6yEuh#  
<!:,(V>F(C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8k'UEf`'(  
 //{{AFX_MSG_MAP(CAboutDlg) Z,o*M#}  
 // No message handlers c L*D_)?8  
 //}}AFX_MSG_MAP ssW+'GD  
END_MESSAGE_MAP() 6w K=  
-tT{h 4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,=l MtW  
: CDialog(CCaptureDlg::IDD, pParent) ^DHFP-G?e  
{ L>{E8qv>w  
 //{{AFX_DATA_INIT(CCaptureDlg) [!{*)4$6  
  m_bControl = FALSE; 64}Oa+*s  
  m_bAlt = FALSE; daBu<0\  
  m_bShift = FALSE; Kzxzz6R?  
  m_Path = _T("c:\\"); / /qTMxn  
  m_Number = _T("0 picture captured."); Vn1kC  
  nCount=0; _1*EMq6  
  bRegistered=FALSE; c=H(*#  
  bTray=FALSE; VL"ZC:n)-  
 //}}AFX_DATA_INIT AO;`k]0e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ZZTPAmIr  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _,b%t1v  
} 7dX1.}M<(  
%iIryv;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _jef{j  
{ yhEU *\:  
 CDialog::DoDataExchange(pDX); V_U$JKJ1=  
 //{{AFX_DATA_MAP(CCaptureDlg) q /|<>s  
  DDX_Control(pDX, IDC_KEY, m_Key); yY*OAC  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  D@qq=M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]M{SM`Ya  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j._9;HifZ  
  DDX_Text(pDX, IDC_PATH, m_Path); ltt%X].[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >82Q!HaH  
 //}}AFX_DATA_MAP E?&dZR  
} 'q1)W'  
D`e!CprF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >8SX,  
//{{AFX_MSG_MAP(CCaptureDlg) {Cs~5jYz  
 ON_WM_SYSCOMMAND() G5zZf ~r  
 ON_WM_PAINT() ksY^w+>(!  
 ON_WM_QUERYDRAGICON() -w 2!k  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ezlp~z"_k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oypq3V=5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) XPzwT2_E  
//}}AFX_MSG_MAP =,-80WNsX  
END_MESSAGE_MAP() 6fPuTQ}fY>  
,e>C)wq;  
BOOL CCaptureDlg::OnInitDialog() M#})  
{ /'E+(Y&:J  
 CDialog::OnInitDialog(); $$ {ebt  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %kNkDI  
 ASSERT(IDM_ABOUTBOX < 0xF000); *%ZfE,bu8<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); j]J2,J  
 if (pSysMenu != NULL) qfppJ8L  
 { s;}';#  
  CString strAboutMenu; Mim 9C]h(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); e@p` -;<  
  if (!strAboutMenu.IsEmpty()) dz5bW>  
  { - J!F((jt  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]*juF[r(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4_PMl6qo  
  } 6,_CL M  
 } e kI1j%fO  
 SetIcon(m_hIcon, TRUE); // Set big icon `]WU=Ss  
 SetIcon(m_hIcon, FALSE); // Set small icon &4"(bZ:LO  
 m_Key.SetCurSel(0); Ym& _IOx  
 RegisterHotkey(); @Qruc\_  
 CMenu* pMenu=GetSystemMenu(FALSE); ;#/b=j\pi  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); N3vk<sr@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'n4zFj+S  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); / c/!13|  
 return TRUE; // return TRUE unless you set the focus to a control MnKEZ: 2  
} jY>KF'y  
8<)[+ @$0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k4pvp5}%  
{ H) q9.Jg  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZH_ J+  
 { D8`,PXtV  
  CAboutDlg dlgAbout; zfi{SO l  
  dlgAbout.DoModal(); M0c"wi@S_  
 } 5/:Zj,41{  
 else $g#X9/+<  
 { Fxv~;o#  
  CDialog::OnSysCommand(nID, lParam); OD>-^W t;%  
 } ; {I{X}b  
} rVQ:7\=Z  
u9mMkzgSkP  
void CCaptureDlg::OnPaint() sF_.9G)S0  
{ "TtK!>!.  
 if (IsIconic()) a+\ Gz  
 { ~<v`&Gm?"  
  CPaintDC dc(this); // device context for painting M%&`&{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }kL% l  
  // Center icon in client rectangle K* [cJcY+  
  int cxIcon = GetSystemMetrics(SM_CXICON); 6gakopZO  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'y-IE#!5  
  CRect rect; H W.S~eLw*  
  GetClientRect(&rect); qK|r+}g|&  
  int x = (rect.Width() - cxIcon + 1) / 2; c)@M7UK[  
  int y = (rect.Height() - cyIcon + 1) / 2; 4CX*  
  // Draw the icon S)g5Tu)  
  dc.DrawIcon(x, y, m_hIcon); L=Dx$#|  
 } MrOW&7  
 else .vQ2w  
 { Z`b,0[rG[  
  CDialog::OnPaint(); (jY.S|%  
 } + 6r@HK`,t  
} (O&~*7D*  
XFK$p^qu  
HCURSOR CCaptureDlg::OnQueryDragIcon() \iowAo$  
{ !n uXK  
 return (HCURSOR) m_hIcon; Q:_pW<^  
} RG*Nw6A  
s%4)}w;z  
void CCaptureDlg::OnCancel() .fo.mC@a  
{ &lI.N~Ao  
 if(bTray) n )`*{uv$  
  DeleteIcon(); {j:{wW.  
  CDialog::OnCancel();  Kn\Oj=4  
} Htsa<t F  
(CZRX9TT1  
void CCaptureDlg::OnAbout() lzS"NHs<g(  
{ kf"cd 1  
 CAboutDlg dlg; cO(|>&tJ  
 dlg.DoModal(); '^Sa|WXq  
} 2vj)3%:7#E  
vNE91  
void CCaptureDlg::OnBrowse() I &{dan2  
{ P7u5Ykc*  
 CString str; Pq7YJ"Z?:  
 BROWSEINFO bi; )%ja6Vg  
 char name[MAX_PATH]; aN;L5;m#>{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [gv2fqpP  
 bi.hwndOwner=GetSafeHwnd(); z)|56 F7'  
 bi.pszDisplayName=name; #exE ~@fy-  
 bi.lpszTitle="Select folder"; m?<C\&)6x  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {'d?vm!r  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1Ll@ ocE  
 if(idl==NULL) `]tXQqD  
  return; sF|<m)Kt{W  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?FMHK\  
 str.ReleaseBuffer(); H%faRUonz  
 m_Path=str; &lGp /m:  
 if(str.GetAt(str.GetLength()-1)!='\\') ^vG*8,^S=8  
  m_Path+="\\"; N{Is2Ia  
 UpdateData(FALSE); 6x[gg !;85  
} "F%cn@l  
j/^0q90QO  
void CCaptureDlg::SaveBmp() Ns1u0$fg  
{ ~"=nt@M]  
 CDC dc; 1YM04*H  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); C'5i>;  
 CBitmap bm; 5jYRIvM[Q~  
 int Width=GetSystemMetrics(SM_CXSCREEN); IL>Gi`Y&  
 int Height=GetSystemMetrics(SM_CYSCREEN); {SROg;vA  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vn,L),"=  
 CDC tdc; ze#LX4b I  
 tdc.CreateCompatibleDC(&dc); <[a9"G 7  
 CBitmap*pOld=tdc.SelectObject(&bm); MR+ndB<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); })"9TfC  
 tdc.SelectObject(pOld); }B0V$  
 BITMAP btm; vQIoj31  
 bm.GetBitmap(&btm); $f C=v  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 'M G)noN5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :&TOQ<vM  
 BITMAPINFOHEADER bih; %W`pTvF  
 bih.biBitCount=btm.bmBitsPixel; x%x[5.CT  
 bih.biClrImportant=0; 40q8,M  
 bih.biClrUsed=0; U 2\{ ( y  
 bih.biCompression=0; bLNQ%=FjO  
 bih.biHeight=btm.bmHeight; < ^J!*>  
 bih.biPlanes=1; vx-u+/\  
 bih.biSize=sizeof(BITMAPINFOHEADER); KUuwScb\  
 bih.biSizeImage=size; k87B+0QEL  
 bih.biWidth=btm.bmWidth; 1~5={eI  
 bih.biXPelsPerMeter=0; QiwZk<rb  
 bih.biYPelsPerMeter=0; \h #vL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KWN&nP +  
 static int filecount=0; (6JD<pBm  
 CString name; (dO4ww@O  
 name.Format("pict%04d.bmp",filecount++); Ye1P5+W(  
 name=m_Path+name; L {5zA5#m  
 BITMAPFILEHEADER bfh; M(/%w"R  
 bfh.bfReserved1=bfh.bfReserved2=0; B>~E6j7[Mp  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bJ/~UEZw  
 bfh.bfSize=54+size; <y`yKXzBUV  
 bfh.bfOffBits=54; T8qG9)~3  
 CFile bf; Q7#Q6-Q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Vr5a:u'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -{P)\5.L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); TWxMexiW  
  bf.WriteHuge(lpData,size); ,P9B8oIq  
  bf.Close(); !})+WSs'"s  
  nCount++; \ &_ -  
 } dd$\Q  
 GlobalFreePtr(lpData); [ ra [~  
 if(nCount==1) x{ZcF=4  
  m_Number.Format("%d picture captured.",nCount);  NU_VUd2  
 else KE(kR>OB]  
  m_Number.Format("%d pictures captured.",nCount); LXw&d]P  
  UpdateData(FALSE); Hj2P|;2S  
} 8qBw;A)  
_;0:wXib =  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AY *  
{ Z/ThY bk  
 if(pMsg -> message == WM_KEYDOWN) !)&-\!M>  
 { 6NZ f!7,B  
  if(pMsg -> wParam == VK_ESCAPE) &G'R{s&"  
   return TRUE; =@ON>SmPs  
  if(pMsg -> wParam == VK_RETURN) ^{Mx?]z  
   return TRUE; @];Xbbw+c  
 } Y @K9Hl  
 return CDialog::PreTranslateMessage(pMsg); 0e/~H^,SQ  
} rg\|-_.es'  
}*0%wP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :!aFfb["  
{ rfCoi>{<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ NGb`f-:jw  
  SaveBmp(); E2dSOZS:)%  
  return FALSE; i&?~QQP`  
} Y4b"(ZhM_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ & f!!UZMt)  
 CMenu pop; ~[,E i k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ie+z"&0  
 CMenu*pMenu=pop.GetSubMenu(0); {~d4;ht1Y  
 pMenu->SetDefaultItem(ID_EXITICON); bg 7b!t1F  
 CPoint pt; 4I2ppz   
 GetCursorPos(&pt); zM)o^Fn2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); vguqk!eo4  
 if(id==ID_EXITICON) |r3eq4$Am  
  DeleteIcon(); ,@>B#%Nz  
 else if(id==ID_EXIT)  r5F#q  
  OnCancel(); y6G[-?"/Q  
 return FALSE; R4qS,2E  
} =8<SKY&\X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); V:IoeQ]-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 'RG`DzuF  
 AddIcon(); }*+ca>K  
 return res; U8.DPRa  
} 5@Rf]'1B0  
gE8>5_R|  
void CCaptureDlg::AddIcon() sg9ZYWcL  
{ s[Njk@y,  
 NOTIFYICONDATA data; J)o~FC]b*  
 data.cbSize=sizeof(NOTIFYICONDATA); uRUysLIw  
 CString tip; Q OdvzVy<  
 tip.LoadString(IDS_ICONTIP); $R"~BZbt;  
 data.hIcon=GetIcon(0); )|2g#hH5  
 data.hWnd=GetSafeHwnd(); 7$b78wax  
 strcpy(data.szTip,tip); r)*KgGsk  
 data.uCallbackMessage=IDM_SHELL; 9fe~Q%x=u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2"%d!"  
 data.uID=98; B\N,%vsx#U  
 Shell_NotifyIcon(NIM_ADD,&data); \7Zk[)!FL  
 ShowWindow(SW_HIDE); i;Gl-b\_h  
 bTray=TRUE; dyg1.n#M}  
} jIuE1ve  
z+wBZn{0I  
void CCaptureDlg::DeleteIcon() !5p 01]7  
{ 7(wY4T  
 NOTIFYICONDATA data; H#Vs3*VK  
 data.cbSize=sizeof(NOTIFYICONDATA); m T\]  
 data.hWnd=GetSafeHwnd(); 1k "*@Z<  
 data.uID=98; ukhI'alS,  
 Shell_NotifyIcon(NIM_DELETE,&data); KqB(W ,$  
 ShowWindow(SW_SHOW); rsiG]o=8  
 SetForegroundWindow(); V_Y SYG9f  
 ShowWindow(SW_SHOWNORMAL); !QC->  
 bTray=FALSE; ~sk 4v:-  
} aIJ[K  
a*?? !  
void CCaptureDlg::OnChange() LoNz 1KJL  
{ A "w 1GBx  
 RegisterHotkey(); %Wu3$b  
} ~2 =B:;  
IWKQU/l!  
BOOL CCaptureDlg::RegisterHotkey() 9I.="b=J)  
{ ]k>S0  
 UpdateData(); [?]s((A~B  
 UCHAR mask=0; wn|Sdp  
 UCHAR key=0; , gz:2UY#  
 if(m_bControl) Rrk3EL  
  mask|=4; uv._N6mj  
 if(m_bAlt) ][#]4 _  
  mask|=2; dZ;cs c@xv  
 if(m_bShift) C+2*m=r  
  mask|=1; O(wt[AEA  
  key=Key_Table[m_Key.GetCurSel()]; E[ e ''  
 if(bRegistered){ 8Gs{Zfp!D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wVw3YIN#  
  bRegistered=FALSE; _`ot||J  
 } ?l bK;Kv  
 cMask=mask; r=s2wjk  
 cKey=key; |8V+(Vzl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1oodw!hW  
 return bRegistered; Qv[@ioc  
} s{hJ"lv:  
Z wIsEJz  
  四、小结 'rU 5VrK  
"EHwv2Hm>  
  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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