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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: T KpX]H`  
  SM>V o+  
  一、实现方法 pJM~'tlHV  
3#)I7FG  
  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: v7rEU S-  
t*<@>]k  
#pragma data_seg("shareddata") ~udi=J |  
HHOOK hHook =NULL; //钩子句柄 b"U{@  
UINT nHookCount =0; //挂接的程序数目 25xpq^Zw  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 eKd F-;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D ff0$06Nq  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey , sEu[m  
static int KeyCount =0; XA8{N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X+l &MD  
#pragma data_seg() sGx"j a +  
.~#<>  
  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。 6nxX~k  
F,2)Udim  
  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: VgfA&?4[  
5GD6%{\O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR w2B If[~t  
cKey,UCHAR cMask) d-%!.,F#W  
{ 0fgt2gA33  
 BOOL bAdded=FALSE; [%U(l<  
 for(int index=0;index<MAX_KEY;index++){ 21Z}Zj  
  if(hCallWnd[index]==0){ HWe?vz$4"  
   hCallWnd[index]=hWnd; !acm@"Ea  
   HotKey[index]=cKey; \A gPkW  
   HotKeyMask[index]=cMask; R~40,$e{  
   bAdded=TRUE; O 0Fw!IQk  
   KeyCount++; W5a)`%H  
   break; xf1@mi[a  
  } rCGyr}(NC  
 } (_^pX  
 return bAdded; YGy.39@31  
} 7P}&<;5zD  
//删除热键 * b+ef  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Kk?P89=*  
{ S{cy|QD  
 BOOL bRemoved=FALSE; c(@V t&gE  
 for(int index=0;index<MAX_KEY;index++){ vby[# S|  
  if(hCallWnd[index]==hWnd){ %E q} H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c"X`OB  
    hCallWnd[index]=NULL; ^l\U6$3  
    HotKey[index]=0; ]MjQr0&M  
    HotKeyMask[index]=0; '1?b?nVo  
    bRemoved=TRUE; cx?XJ)  
    KeyCount--; 'gYUyl  
    break; kh3PEq   
   } _tE`W96J  
  } PprCz"  
 } <"I#lib  
 return bRemoved; N}0-L$@SL  
} V:?exJg9  
s;-(dQ{O  
`TNW LD@Z  
  DLL中的钩子函数如下: Y{P0?`  
TxZ ^zj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NUVFG;  
{ P$E#C:=  
 BOOL bProcessed=FALSE; `Q d_Gu,M  
 if(HC_ACTION==nCode) a4gJ-FE  
 { %%["&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 KCR6@{@  
   switch(wParam) Obd@#uab  
   {  s{v!jZ  
    case VK_MENU: AH$D./a  
     MaskBits&=~ALTBIT; 7TCY$RcF,I  
     break; T_}9b  
    case VK_CONTROL: t!MGSB~  
     MaskBits&=~CTRLBIT; %u"3&kOV  
     break; 3D3/\E#'o  
    case VK_SHIFT: I f9t^T#  
     MaskBits&=~SHIFTBIT; yyZV/ x~  
     break; $ZSjq  
    default: //judge the key and send message [[(29|`]  
     break; T%kr&XsQX  
   } tuzw% =Ey  
   for(int index=0;index<MAX_KEY;index++){ rwb7>]UI"d  
    if(hCallWnd[index]==NULL) u~Zx9>f  
     continue; U~krv> I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tHez S~t_  
    { M*|,05>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OQt_nb#z`{  
     bProcessed=TRUE; '0z-duu  
    } P !:LAb(  
   } xij`Mr  
  } =FXO1UZ!  
  else if((lParam&0xc000ffff)==1){ //有键按下 =b{wzx}e  
   switch(wParam) P@ Oq'y[  
   { i v7^ !  
    case VK_MENU: ay}} v7)GM  
     MaskBits|=ALTBIT; =<ngtN  
     break; x9UF  
    case VK_CONTROL: +Tnn'^4  
     MaskBits|=CTRLBIT; Gh3b*O_,  
     break; d>j`|(\  
    case VK_SHIFT: :q_(=EA  
     MaskBits|=SHIFTBIT; eH.~c3o  
     break; K&2{k+ w  
    default: //judge the key and send message 4\qnCf3  
     break; pSM\(kVKa  
   } XJ &'4h  
   for(int index=0;index<MAX_KEY;index++){ $)w9EGZ  
    if(hCallWnd[index]==NULL) `9IG//  
     continue; N?]HWP^pg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  4[=vt  
    { e nsou!l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,,_$r7H`  
     bProcessed=TRUE; r+6=b"  
    } B%P g:|  
   } I<p- o/TP  
  } Z(F`M;1>xI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JHN{vB  
   for(int index=0;index<MAX_KEY;index++){ XcfvmlBoD-  
    if(hCallWnd[index]==NULL) 8G&'ED_&  
     continue; nksx|i l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {OA2';3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~\;s}Fv.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 JDi\?m d.  
   } _.b^4^[  
  } t= =+SHGP  
 } `cee tr=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b^WTX  
} Bf {h\>q  
q~QB?+ x&  
  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: xaQO=[  
0E[&:6#Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .UJp#/EHs  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >)E{Hs  
/CR Z  
  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: QrmiQ]d*p  
KxZup\\:v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hzG+s#  
{ h B@M5Mc$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b#ih= qE  
 { $\:;N]Cs~0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BhJag L ^o  
  SaveBmp(); -?T:> *]p  
  return FALSE; >93I|C|  
 } ;8!L*uMI  
 …… //其它处理及默认处理 $^[^ ]Q  
} -M{.KqyW  
,OGXH2!h  
)zU bMzF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 >M~wFs$~  
'Ipp1a Z_M  
  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。 M$@Donx  
=t,}I\_^c  
  二、编程步骤 gK8E|f-z  
9Tju+KcK  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ) ?L  
~hx__^]d  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >)V1aLu=  
El9D1],  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _VvXE572  
,\2w+L5TD  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; J 'qhY'te  
o3=2`BvJ  
  5、 添加代码,编译运行程序。 1MVzu7  
3rRN~$  
三、程序代码 +;@p'af!9  
1$A7BP  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5;:P^[cH9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) eyUhM jd  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P&3Z,f0  
#if _MSC_VER > 1000 ^seb8o7  
#pragma once OhNEt>  
#endif // _MSC_VER > 1000 i.~*G8!DM  
#ifndef __AFXWIN_H__ ;|a,1#x  
#error include 'stdafx.h' before including this file for PCH fWutB5?P  
#endif #.Q8q  
#include "resource.h" // main symbols kimqm  
class CHookApp : public CWinApp %d%$jF`  
{ Ug2^cgL  
 public:  ,m"0Bu2  
  CHookApp(); qFV }Y0w  
  // Overrides &@dMIJK"(  
  // ClassWizard generated virtual function overrides XkGS3EY  
  //{{AFX_VIRTUAL(CHookApp) sTmY'5ry  
 public: {y>o6OTITR  
  virtual BOOL InitInstance(); cq?&edjP  
  virtual int ExitInstance(); #RN"Ul-B|  
  //}}AFX_VIRTUAL liU/O:Ap  
  //{{AFX_MSG(CHookApp) 7QnQ=gu  
  // NOTE - the ClassWizard will add and remove member functions here. S(&]?!  
  // DO NOT EDIT what you see in these blocks of generated code ! il403Ae0  
  //}}AFX_MSG IN{ 1itE  
  DECLARE_MESSAGE_MAP() -JMlk:~  
}; O /S:S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); czp .q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K1*oYHB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1kDr;.m%  
BOOL InitHotkey(); {(00,6M)i  
BOOL UnInit(); h3udS{9 '8  
#endif \os iY ^  
5:T)hoF@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. MhaoD5*9  
#include "stdafx.h" c;M&;'#x  
#include "hook.h" Pl9Ky(Q`V  
#include <windowsx.h> "{1SDbwmMo  
#ifdef _DEBUG Ho_ 2zx:8b  
#define new DEBUG_NEW m h5ozv$  
#undef THIS_FILE +6i~Rx>  
static char THIS_FILE[] = __FILE__; 7K.in3M(  
#endif C=y[WsT  
#define MAX_KEY 100 jdEqa$CXG  
#define CTRLBIT 0x04 o 5;V=8T;  
#define ALTBIT 0x02 [Y%H8}  
#define SHIFTBIT 0x01 .5ItH^  
#pragma data_seg("shareddata") DqQ+8 w  
HHOOK hHook =NULL; 4ne95_i  
UINT nHookCount =0; Z'@a@Y+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l7p*: :(9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT !(&N{NH9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey v[}g+3a  
static int KeyCount =0; \/ 9s<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift s?}m~Pl  
#pragma data_seg() sz?/4tY  
HINSTANCE hins; ~?BN4ptc  
void VerifyWindow(); yn;sd+:z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) c}l?x \/  
//{{AFX_MSG_MAP(CHookApp) doj$chy  
// NOTE - the ClassWizard will add and remove mapping macros here. >axf_k  
// DO NOT EDIT what you see in these blocks of generated code! Qgel^"t]i  
//}}AFX_MSG_MAP X-mhz3Q&a  
END_MESSAGE_MAP() 3WTNWz#h  
{,Py%.vvR  
CHookApp::CHookApp() +OTNn@!9  
{ #xlT,:_:)  
 // TODO: add construction code here, f(}AdW}?  
 // Place all significant initialization in InitInstance FK:Tni  
} 7^3a296  
6Z,j^: B  
CHookApp theApp; > ]()#z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4?vTuZ/ M  
{ ~\ C.Nm  
 BOOL bProcessed=FALSE; |Qa[N(  
 if(HC_ACTION==nCode) XXe?@w2{  
 { )q>mt/,  
  if((lParam&0xc0000000)==0xc0000000){// Key up L)!9+!PKD  
   switch(wParam) _rmTX.'w  
   { mh8{`W&  
    case VK_MENU:  ?[`*z?}  
     MaskBits&=~ALTBIT; VEtdp*ot  
     break; :I)WSXP9h  
    case VK_CONTROL: jH4'jB  
     MaskBits&=~CTRLBIT; B7R*g,(  
     break; Alh"ZT^*  
    case VK_SHIFT: "'8^OZR  
     MaskBits&=~SHIFTBIT; o/6 'g)r*  
     break; e 2@{Ab  
    default: //judge the key and send message i!U,qV1  
     break; W-ctx"9DS  
   } k>ERU]7[  
   for(int index=0;index<MAX_KEY;index++){ pod=|(c  
    if(hCallWnd[index]==NULL) foi@z9  
     continue; "PI]k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6(FkcC$G  
    { ,o\-'   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); RdtF5#\z  
     bProcessed=TRUE; <$8`]e?I  
    } ];n3H~2  
   } (C=.&',P  
  } ]l~TI8gC  
  else if((lParam&0xc000ffff)==1){ //Key down FU~xKNr  
   switch(wParam) tzKIi_2  
   { 82z\^a  
    case VK_MENU: B_u1FWc  
     MaskBits|=ALTBIT; ZjEc\{ s  
     break; f=f8) +5  
    case VK_CONTROL: 6H)T=Z|  
     MaskBits|=CTRLBIT; X5V8w4NN  
     break; x'c%w:  
    case VK_SHIFT: Hfw*\=p  
     MaskBits|=SHIFTBIT; !pwY@} oL  
     break; AxbQN.E  
    default: //judge the key and send message *G6Py,- !f  
     break; oQ=v:P]  
   } }ob&d.XZ  
   for(int index=0;index<MAX_KEY;index++) VXM5 B  
   { +;ILj<!Z7  
    if(hCallWnd[index]==NULL) W'B=H1  
     continue; pel{ ;r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "Q>gQKgL  
    { d5hYOhO[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ry2ZVIFa  
     bProcessed=TRUE; YoT< ]'  
    } p,)~w1|  
   } {Y\W&Edw%  
  } \9Z1'W  
  if(!bProcessed){ YEg(QOn3Q  
   for(int index=0;index<MAX_KEY;index++){  ./iC  
    if(hCallWnd[index]==NULL) I 19 /  
     continue; ) Ekd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9HtzBS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T@S\:P  
   } n[mVwQ(%  
  } 5}pn5iI  
 } n.323tNY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %YH+=b:uW  
} YEbB3N  
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BOOL InitHotkey() Tx+Bkfj  
{ [b=l'e/  
 if(hHook!=NULL){ 3Y L  
  nHookCount++; Ub(8ko:8$  
  return TRUE; GW29Rj1  
 } _`H2CXG g  
 else j.b7<Vr4;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); sp2"c"_+  
  if(hHook!=NULL) {DI`HB[  
   nHookCount++;  L$Uy  
  return (hHook!=NULL); @AvDV$F  
} o~_wx  
BOOL UnInit() D)]U+Qk  
{ N`G* h^YQ  
 if(nHookCount>1){ -$@$  
  nHookCount--; 5Oa`1?C1  
  return TRUE; zm& D #)  
 } =&5^[:ksB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); z<T(afM{*  
 if(unhooked==TRUE){ TIs~?wb$  
  nHookCount=0; o|tq&&! <  
  hHook=NULL; qHGwD20 ~  
 } eplz5%<  
 return unhooked; ']bpsn  
} C9,|G7~*q  
(O$PJLI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NFVr$?P  
{ 61XLL/=P  
 BOOL bAdded=FALSE; ,C=Lu9  
 for(int index=0;index<MAX_KEY;index++){ sULCYiT|Hn  
  if(hCallWnd[index]==0){ g}cb>'=={  
   hCallWnd[index]=hWnd; FnoE\2}9  
   HotKey[index]=cKey; c]eDTbXd  
   HotKeyMask[index]=cMask; j o7`DDb  
   bAdded=TRUE; ;2NJkn9t  
   KeyCount++; nB~hmE)  
   break; *an^ 0  
  } L,(H(GeX  
 } < wI z8V  
 return bAdded; x)wlp{rLf  
} sDylSYq  
j,]KidDWm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  1\[En/6  
{ K4r"Q*h  
 BOOL bRemoved=FALSE; JGJy_.C  
 for(int index=0;index<MAX_KEY;index++){ ?4[IIX-  
  if(hCallWnd[index]==hWnd){ PNSV?RT*pG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !XJvhsKXy  
    hCallWnd[index]=NULL; g`2DJi&)  
    HotKey[index]=0; 3:S>MFRn.3  
    HotKeyMask[index]=0; feSj3,<!  
    bRemoved=TRUE; \V1geSoE  
    KeyCount--; 4 8}\  
    break; $N}nO:`t  
   } 2j*+^&M/  
  } ~]d3 f  
 } ||}k99y +  
 return bRemoved; 3pV^Oe^9  
} o_(@v2G`  
O/?Lk*r  
void VerifyWindow() $ykujyngS4  
{ XBmAD!  
 for(int i=0;i<MAX_KEY;i++){ )P>}uK;  
  if(hCallWnd!=NULL){ cC NyW2'  
   if(!IsWindow(hCallWnd)){ k3 YDnMRA9  
    hCallWnd=NULL; <\9M+  
    HotKey=0; T[?toqkD>z  
    HotKeyMask=0; 3eg)O34  
    KeyCount--; Wubvvm8U  
   } "-WEUz  
  } Bb~Q]V=x;  
 } h@^d Vg  
} PsV1btq]  
gsSUmf1  
BOOL CHookApp::InitInstance() 1-h"1UN2E  
{ "f1`6cx6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); GY%2EM(  
 hins=AfxGetInstanceHandle(); :vsF4  
 InitHotkey(); f4b`*KGf  
 return CWinApp::InitInstance(); Z{MR#.I  
} gf&\)"  
'X$J+s}6&  
int CHookApp::ExitInstance() \qo}}I>e  
{ 6AA "JX  
 VerifyWindow(); }Qqi013E L  
 UnInit(); (oUh:w.]Gw  
 return CWinApp::ExitInstance(); q#6K'=AC  
} )R- e^Cb  
6>hW.aq}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file HRG2sv T4t  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U#X6KRZ~g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ G2,9$8qE  
#if _MSC_VER > 1000 H2cY},  
#pragma once q_R^Q>ZIe  
#endif // _MSC_VER > 1000 ]46-TuH  
){sn!5=  
class CCaptureDlg : public CDialog  t=6[FK  
{ KkCA*GS  
 // Construction T2%{pcdV/  
 public: fbjT"jSzw  
  BOOL bTray; _ Cu,"  
  BOOL bRegistered; G<M X94?  
  BOOL RegisterHotkey(); Mq#sSBE<K  
  UCHAR cKey; z0v|%&IK  
  UCHAR cMask; _[kZ:#  
  void DeleteIcon(); 4(hHp6}b  
  void AddIcon(); ,lUroO^^  
  UINT nCount; =8p *Ijs  
  void SaveBmp(); 1Fs:&*=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hE9UWa.Q>  
  // Dialog Data QrX 5Kwq  
  //{{AFX_DATA(CCaptureDlg) *=KX0%3  
  enum { IDD = IDD_CAPTURE_DIALOG }; G|LJOq7QB  
  CComboBox m_Key; s4&JBm(33N  
  BOOL m_bControl; H;=JqD8`  
  BOOL m_bAlt; p_Yx"nO7  
  BOOL m_bShift; oA;> z  
  CString m_Path; |_H{ B+.  
  CString m_Number; d*===~  
  //}}AFX_DATA NmH:/xU?^  
  // ClassWizard generated virtual function overrides oE;SZ"$ x  
  //{{AFX_VIRTUAL(CCaptureDlg) d$;1%rRj8  
 public: v< Ozr:lL  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0c,)T1NG>  
 protected: Vi5&%/Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R|,F C'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); DEFh&n  
  //}}AFX_VIRTUAL /+p]VHP\  
  // Implementation m|%L[h1  
 protected: ,Qw\w,  
  HICON m_hIcon; SBbPO5^](  
  // Generated message map functions RPh8n4&("  
  //{{AFX_MSG(CCaptureDlg) tnn,lWu|  
  virtual BOOL OnInitDialog(); zNo(|;19  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'y? HF@NJ  
  afx_msg void OnPaint(); KsG>,# Q  
  afx_msg HCURSOR OnQueryDragIcon(); sZ7RiH +I  
  virtual void OnCancel(); /BaXWrd+  
  afx_msg void OnAbout(); {<k}U;uiO  
  afx_msg void OnBrowse(); w<o#/J9  
  afx_msg void OnChange(); &UV=<Az {  
 //}}AFX_MSG .>;}GsN&  
 DECLARE_MESSAGE_MAP() fN-y8  
}; XVRtfo  
#endif V1 :aR3*!  
1f/8XxTB  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N =0R6{'  
#include "stdafx.h" H"n@=DMLm  
#include "Capture.h" 'a6:3*  
#include "CaptureDlg.h" $1ZF kw  
#include <windowsx.h> *qN (_  
#pragma comment(lib,"hook.lib") uA1DTr?z  
#ifdef _DEBUG Qk_Mx"  
#define new DEBUG_NEW |Ox !tvyr  
#undef THIS_FILE "KhVS  
static char THIS_FILE[] = __FILE__; c8=@ s#  
#endif =I6u*$9<  
#define IDM_SHELL WM_USER+1 M?FbBJ`sF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q*c |!< &e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )tB1jcI;  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f|cF [&wo  
class CAboutDlg : public CDialog 28jm*Cl8  
{ GO|EeM!iB  
 public: \.AI;^)X@]  
  CAboutDlg(); L[LgQ7es Q  
  // Dialog Data ;i,:F`b~  
  //{{AFX_DATA(CAboutDlg) !arTR.b\  
  enum { IDD = IDD_ABOUTBOX }; 6 z2_b wo  
  //}}AFX_DATA eCI0o5U  
  // ClassWizard generated virtual function overrides >RL|W}tI4  
  //{{AFX_VIRTUAL(CAboutDlg) S^/:O.X)c,  
 protected: Z9+xB"q2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h=`1sfz  
  //}}AFX_VIRTUAL UZ qQ|3  
  // Implementation d O'apey  
 protected: ; ^cc-bLvF  
  //{{AFX_MSG(CAboutDlg) =w/S{yC  
  //}}AFX_MSG %x5zs ]4^  
  DECLARE_MESSAGE_MAP() [ ]LiL;A&  
}; "p[FFg  
320g!r  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?->&)oAh  
{ F87aIJ.pGN  
 //{{AFX_DATA_INIT(CAboutDlg) wwI'n*Q'$  
 //}}AFX_DATA_INIT }ippi6b:r  
} 4[$D3,A  
 @U;U0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~?x `f +  
{ R2%>y5dD  
 CDialog::DoDataExchange(pDX);  &9*MO  
 //{{AFX_DATA_MAP(CAboutDlg) % w0Vf$  
 //}}AFX_DATA_MAP (q|EC;   
} [L+VvO%cT  
<s737Rl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SA'c}gP  
 //{{AFX_MSG_MAP(CAboutDlg) oO 8opS7F  
 // No message handlers $sTvXf:g  
 //}}AFX_MSG_MAP kl90w  
END_MESSAGE_MAP() 5 Y|(i1  
k"V@9q;*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9}TQ u0  
: CDialog(CCaptureDlg::IDD, pParent) oD=6D9c?  
{ (XDK&]U  
 //{{AFX_DATA_INIT(CCaptureDlg) IxxA8[^V  
  m_bControl = FALSE; @N'0:0Nb_  
  m_bAlt = FALSE; Ub%sw&QG(9  
  m_bShift = FALSE; KW[Jft  
  m_Path = _T("c:\\"); 3IK+&hk  
  m_Number = _T("0 picture captured."); VSJ08Ngi   
  nCount=0; 5{@Hpj/B  
  bRegistered=FALSE; ,svj(HP$  
  bTray=FALSE; ZGHh!Ds;  
 //}}AFX_DATA_INIT NL-<K  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !]v&/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xqA XfJ.  
} ~1`ZPLVG  
e#uk+]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z12c9k%s  
{ i7RW8*  
 CDialog::DoDataExchange(pDX); R Wd#)3  
 //{{AFX_DATA_MAP(CCaptureDlg) R>YDn|cWI  
  DDX_Control(pDX, IDC_KEY, m_Key); .-(s`2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?R ;K`f9<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5%5z@Ka  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @}^eyS$|!  
  DDX_Text(pDX, IDC_PATH, m_Path); (6WSQqp  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S/XkxGZ2  
 //}}AFX_DATA_MAP Gw;[maM!%`  
} Q6r!=yOEY  
OGjeE4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W,[b:[~v  
//{{AFX_MSG_MAP(CCaptureDlg) B9-Nb 4  
 ON_WM_SYSCOMMAND() )^ky @V  
 ON_WM_PAINT() mu!hD^fw  
 ON_WM_QUERYDRAGICON()  xlH?J;$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q[}[w!to  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) b)eKa40Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) A`D^}F6  
//}}AFX_MSG_MAP t#p*{S 3u  
END_MESSAGE_MAP() hjgxCSp  
-'sn0 _q/e  
BOOL CCaptureDlg::OnInitDialog()  );cu{GY  
{ vX'@we7Q{  
 CDialog::OnInitDialog(); %ys-y?r  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); pNHO;N[&  
 ASSERT(IDM_ABOUTBOX < 0xF000); xTJ-v/t3<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \"r*wae  
 if (pSysMenu != NULL) y+C.2 ca  
 { 8w[nY.#T  
  CString strAboutMenu; _Q:739&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); r:&"#F   
  if (!strAboutMenu.IsEmpty()) 77Fpb?0`  
  { iSZiJ4AUq  
   pSysMenu->AppendMenu(MF_SEPARATOR); l/JE}Eg(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zMXlLRC0  
  } A-"}aCmik  
 } dX58nJ4u  
 SetIcon(m_hIcon, TRUE); // Set big icon ?QnVWu2K  
 SetIcon(m_hIcon, FALSE); // Set small icon *$KUnd-T  
 m_Key.SetCurSel(0); y,*>+xk,  
 RegisterHotkey(); 5G\CT&cQR  
 CMenu* pMenu=GetSystemMenu(FALSE); a s{^~8B  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \rw/d5.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #0hX'8];(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); U~mv1V^.  
 return TRUE; // return TRUE unless you set the focus to a control 4RH'GnLa  
} g36\%L  
f4s^$Q{Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) F=29"1 ._  
{ @R|Gz/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ua@rp3fr  
 { 4)BPrWea1  
  CAboutDlg dlgAbout; ~9:ILCfX  
  dlgAbout.DoModal(); ;9{x""  
 } o H/4opV  
 else ">n38:?R  
 { 5K;vdwSB  
  CDialog::OnSysCommand(nID, lParam); :\*<EIk(  
 } r~sx] =/  
} v]& )+0  
58\Rl  
void CCaptureDlg::OnPaint() Ch%W C ,  
{ 57k@] 3 4  
 if (IsIconic()) 5+].$  
 { 3?iRf6;n  
  CPaintDC dc(this); // device context for painting 6+u}'mSj8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lM`M70~  
  // Center icon in client rectangle f=]+\0MQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3 GmU$w  
  int cyIcon = GetSystemMetrics(SM_CYICON); [g`9C!P-G  
  CRect rect; s%z\szd*  
  GetClientRect(&rect); A&*lb7X  
  int x = (rect.Width() - cxIcon + 1) / 2; 6*8"?S'  
  int y = (rect.Height() - cyIcon + 1) / 2; J@PwN^`  
  // Draw the icon ~CIA6&  
  dc.DrawIcon(x, y, m_hIcon); hNgbHzW  
 } /6jt 5N&,  
 else S 1sNVW  
 { 9\ZlRYnc=  
  CDialog::OnPaint(); Y f:xM>.%  
 } };6[Byf  
} Cx2s5vJX4p  
wi^zXcVj  
HCURSOR CCaptureDlg::OnQueryDragIcon() eQ`TW'[9_6  
{ 7nM]E_  
 return (HCURSOR) m_hIcon; :@x24wN/  
} N7Vv"o  
l5_RG,O0A  
void CCaptureDlg::OnCancel() XdE#l/#  
{ M }=X/*T  
 if(bTray) " 2A`M~  
  DeleteIcon(); S+Z_Qf  
  CDialog::OnCancel(); GEj/Z};;[b  
} \ofWD{*j  
1;?n]L`T  
void CCaptureDlg::OnAbout() mz$)80ly  
{ /\34o{  
 CAboutDlg dlg; EvSo|}JA[  
 dlg.DoModal(); oE \Cwd  
} nJ'FH['  
gw' uY$  
void CCaptureDlg::OnBrowse() DjY&)oce(  
{ z(b0U6)qQ  
 CString str; j3 ,6U jlU  
 BROWSEINFO bi; rDFD rviW_  
 char name[MAX_PATH]; BwMi@r =  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); s\2t|d   
 bi.hwndOwner=GetSafeHwnd(); {:BAh 5e|  
 bi.pszDisplayName=name; Y '7f"W  
 bi.lpszTitle="Select folder"; JAJo^}}{b  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; r LQBaT7t#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  2f>G   
 if(idl==NULL) ziZLw$ )  
  return; *W,tq(%tQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Dx`-Kg_p  
 str.ReleaseBuffer(); 8 g0By;h;  
 m_Path=str; g} \$9  
 if(str.GetAt(str.GetLength()-1)!='\\') :cU6W2EV  
  m_Path+="\\"; I/4:SNha  
 UpdateData(FALSE); "2} {lu  
} <%w)EQf4m  
P`r@<cgb=  
void CCaptureDlg::SaveBmp() 7i^7sT8t  
{  h0}r#L  
 CDC dc; 4UwXrEQp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); K;kaWV  
 CBitmap bm; Bh3N6j+$d  
 int Width=GetSystemMetrics(SM_CXSCREEN); $>Md]/I8  
 int Height=GetSystemMetrics(SM_CYSCREEN); wJ#fmQXKJ5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); WqQAt{W/<  
 CDC tdc; &j=Fx F9o  
 tdc.CreateCompatibleDC(&dc); n7-|\p!xP6  
 CBitmap*pOld=tdc.SelectObject(&bm); mHCp^g4Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (Z(O7X(/  
 tdc.SelectObject(pOld); p1~u5BE7O  
 BITMAP btm; 2kMBe%  
 bm.GetBitmap(&btm); `w/:o$&  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; fLkZ'~e!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c#o(y6  
 BITMAPINFOHEADER bih; %c+`8 wj  
 bih.biBitCount=btm.bmBitsPixel; 12l-NWXf  
 bih.biClrImportant=0; ab"6]%_  
 bih.biClrUsed=0; u@QP<[f  
 bih.biCompression=0; aY`qbJy  
 bih.biHeight=btm.bmHeight; MI8f(ZJK5  
 bih.biPlanes=1; ZqT8G  
 bih.biSize=sizeof(BITMAPINFOHEADER); '"u>;Bq  
 bih.biSizeImage=size; 8 KDF*%7'  
 bih.biWidth=btm.bmWidth; 'dJ#NT25  
 bih.biXPelsPerMeter=0; {Yq"%n'0  
 bih.biYPelsPerMeter=0; EJC{!06L'/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )}ygzKEa  
 static int filecount=0; Pnf|9?~$H  
 CString name; udw>{3>  
 name.Format("pict%04d.bmp",filecount++); : L}Fm2^  
 name=m_Path+name; `|nCr  
 BITMAPFILEHEADER bfh; f3_-{<FZ  
 bfh.bfReserved1=bfh.bfReserved2=0; [I6(;lq2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~)J]`el,Q  
 bfh.bfSize=54+size; R(YhVW_l  
 bfh.bfOffBits=54; ":=\ ci]e%  
 CFile bf; 4}0DEH.Vx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Gg'sgn   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5Bwr\]%$P  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,Sz`$'^c  
  bf.WriteHuge(lpData,size); b!(ew`Y;  
  bf.Close(); t<8vgdD  
  nCount++; }5_[t9LX  
 } ai,\'%N  
 GlobalFreePtr(lpData); f3r\X  
 if(nCount==1) cV;<!f+  
  m_Number.Format("%d picture captured.",nCount); ~H<oqk:O-  
 else u.\FNa  
  m_Number.Format("%d pictures captured.",nCount); Hlh`d N  
  UpdateData(FALSE); eXs^YPi  
} j?c"BF.  
_LVwjZX[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5hxG\f#}?  
{ _xKuEU}  
 if(pMsg -> message == WM_KEYDOWN) =7^rKrD  
 {  +\Hh|Uz5  
  if(pMsg -> wParam == VK_ESCAPE) s R~D3-  
   return TRUE; pFB^l|\ ]  
  if(pMsg -> wParam == VK_RETURN) cy_'QS$W   
   return TRUE; j 3/ I =  
 } hk5[ N=  
 return CDialog::PreTranslateMessage(pMsg); pJg'$iR!/  
} =1|^) 4M,x  
sxG8 jD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +,;"?j6<p  
{ \,n|V3#G  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0iKSUw ps  
  SaveBmp(); "+0Yhr?  
  return FALSE; 2OA0rH"v  
} o*]Tqx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y nue;*rM  
 CMenu pop; .Iu8bN(L`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B|\JGnNQ  
 CMenu*pMenu=pop.GetSubMenu(0); m8jQ~OS  
 pMenu->SetDefaultItem(ID_EXITICON); TTYM!+T  
 CPoint pt; X mmb^2I  
 GetCursorPos(&pt); ,(&p "O":  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -RLY.@'d-M  
 if(id==ID_EXITICON) %yyvB5Y^  
  DeleteIcon(); RZY[DoF8u  
 else if(id==ID_EXIT) @Sr{6g*I  
  OnCancel(); Ee~<PDzB  
 return FALSE; cVV@MC  
} [TW?sW^0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); GgU8f0I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KF.O>c87&  
 AddIcon(); AfAlDM'  
 return res; .8 GX8[t  
} :eH*biXy}2  
}]<Ghns  
void CCaptureDlg::AddIcon() k4C3SI*`4  
{ 9mmkFaBQ  
 NOTIFYICONDATA data; m}-*B1  
 data.cbSize=sizeof(NOTIFYICONDATA); f]_{4Olk  
 CString tip; e7_.Xr~[  
 tip.LoadString(IDS_ICONTIP); -n:~m p  
 data.hIcon=GetIcon(0); AT:L&~O.  
 data.hWnd=GetSafeHwnd(); i?3~Gog  
 strcpy(data.szTip,tip); 3 P=I)q  
 data.uCallbackMessage=IDM_SHELL; H1t`fyri2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xS'Kr.S  
 data.uID=98; h&| S*  
 Shell_NotifyIcon(NIM_ADD,&data); ShIJ6LZ  
 ShowWindow(SW_HIDE); ?5IF;vk  
 bTray=TRUE; !=3Ce3-  
} w *pTK +  
{`ghX%M(l  
void CCaptureDlg::DeleteIcon() YAdk3y~pL  
{ CyV2=o!F w  
 NOTIFYICONDATA data; JhU"akoK  
 data.cbSize=sizeof(NOTIFYICONDATA); ufF>I  
 data.hWnd=GetSafeHwnd(); L*8U.{NY  
 data.uID=98; _'*Vcu`Y  
 Shell_NotifyIcon(NIM_DELETE,&data); t?aOZps  
 ShowWindow(SW_SHOW); q\$k'(k>35  
 SetForegroundWindow(); m ?e::W  
 ShowWindow(SW_SHOWNORMAL); C>:,\=y%  
 bTray=FALSE; tH)fu%:p  
} <G_71J`MLC  
PY@BgL=/  
void CCaptureDlg::OnChange() Dq~ \U&U\$  
{ '% if< /  
 RegisterHotkey(); /prR;'ks  
} w7%.EA{N  
1RgERj  
BOOL CCaptureDlg::RegisterHotkey() jhJ'fI  
{ FX  %(<M  
 UpdateData(); &v/>P1Z G  
 UCHAR mask=0; KU=+ 1,Jf  
 UCHAR key=0; \zT{zO&!  
 if(m_bControl) Be~ '@  
  mask|=4; 9*2Q'z}_  
 if(m_bAlt) P!yOA_)as  
  mask|=2; R*`=Bk0+  
 if(m_bShift) W9G1wU  
  mask|=1; E)iX`Xq|0{  
  key=Key_Table[m_Key.GetCurSel()]; xG1(vn83gq  
 if(bRegistered){ ri1;i= W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Djr/!j  
  bRegistered=FALSE; ,Dy9-o  
 } 6pdek3pOCt  
 cMask=mask; v&)G~cz  
 cKey=key; Gspb\HJ^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pt%*Y.)az  
 return bRegistered; !"LFeqI$lr  
} 0O!A8FA0  
|4j'KM;U  
  四、小结 bIXD(5y  
RgD%pNhI  
  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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