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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: C-M op,w  
  fu`oDi  
  一、实现方法 QxK%ZaFZA  
ReY K5J=O  
  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: +$%o#~  
8ViDh  
#pragma data_seg("shareddata") ms?h/*E<H  
HHOOK hHook =NULL; //钩子句柄 J-U}iU|  
UINT nHookCount =0; //挂接的程序数目 V\ |b#?KL  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 09Fr1PL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7-^d4P+|g  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |Bjb  
static int KeyCount =0; gG}<l ':  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0@ -LV:jU  
#pragma data_seg() 8WAg{lVs  
M*x_1h5n  
  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。 'F@'4[uda  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: U@9n 7F  
-kJ`gdS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8?PNyO-Wt5  
cKey,UCHAR cMask) gw H6r3=y(  
{ fE(rDQI  
 BOOL bAdded=FALSE; ,QK>e;:Be  
 for(int index=0;index<MAX_KEY;index++){ 4 1Ru@  
  if(hCallWnd[index]==0){ N-^\e)ln  
   hCallWnd[index]=hWnd; j,~h:MT  
   HotKey[index]=cKey; %l>^q`p  
   HotKeyMask[index]=cMask; ^P[-HA|  
   bAdded=TRUE; p%}oo#%J  
   KeyCount++; ZY83, :<  
   break; 'p<(6*,"  
  } yPL@uCzA@  
 } $zJ.4NA  
 return bAdded; [u<1DR  
} ? xy~N?N  
//删除热键 v8LKv`I's  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )0NA*<Q+.  
{ us/x.qPy2  
 BOOL bRemoved=FALSE; s)}C&T$Y.  
 for(int index=0;index<MAX_KEY;index++){ $ED<:[3N  
  if(hCallWnd[index]==hWnd){  3N;X|pa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MQhL>oQ  
    hCallWnd[index]=NULL; @6\8&(|  
    HotKey[index]=0; pBHr{/\5  
    HotKeyMask[index]=0; u|+O%s TQ  
    bRemoved=TRUE; Z yIn>]{  
    KeyCount--; lO:[^l?F  
    break; /Qbt  
   } 8tsW^y;S  
  } F77~156  
 } LNe- ]3wB  
 return bRemoved; !dZC-U~  
} N/Z<v* i"  
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"BK&C6]  
  DLL中的钩子函数如下: t/HE@xPxI5  
vrH/Z.WD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :Vv=p*~  
{ 7dAa~!/(  
 BOOL bProcessed=FALSE; aaLT%  
 if(HC_ACTION==nCode) IXg0g<JZ  
 { @@+\  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 pZXva9bE  
   switch(wParam) qPWYY  
   {  m+CvU?)gJ  
    case VK_MENU: [N{Rd[{QTL  
     MaskBits&=~ALTBIT; /']Gnt G.  
     break; ?L'ijzP  
    case VK_CONTROL: 2nk}'HBe  
     MaskBits&=~CTRLBIT; 0nBAO  
     break; zg[ksny  
    case VK_SHIFT: euQ d  
     MaskBits&=~SHIFTBIT; J3C"W7 94}  
     break; 3rs=EMz:w  
    default: //judge the key and send message >*EcX3  
     break; &Jq?tnNd  
   } L~~;i'J  
   for(int index=0;index<MAX_KEY;index++){ qL(Qmgd  
    if(hCallWnd[index]==NULL) 8hdd1lVKO8  
     continue; Wa ,  #  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :h"Y>1P  
    { `*N2x\+X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lr=*Ty(V  
     bProcessed=TRUE; ZfS-W&6Z  
    } iGM-#{5  
   } f~9ADb  
  } >!?u8^C  
  else if((lParam&0xc000ffff)==1){ //有键按下 rT <=`9^{  
   switch(wParam) c/b} 39X  
   { BJ1txdxvS  
    case VK_MENU: ^,@Rd\q  
     MaskBits|=ALTBIT; AS~O*(po  
     break; H+t^eg88  
    case VK_CONTROL: "|(+~8[  
     MaskBits|=CTRLBIT; I@e{>}  
     break; 5yuR[ VU  
    case VK_SHIFT: njX!Ez  
     MaskBits|=SHIFTBIT; [26"?};"%  
     break; LC2t,!RRl&  
    default: //judge the key and send message YEQ}<\B\&  
     break; [ q22?kT  
   } y1B3F5  
   for(int index=0;index<MAX_KEY;index++){ 8nW#Q <s  
    if(hCallWnd[index]==NULL) 1Sr@$+VGO  
     continue; LsoP >vJG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u<:R Sg  
    { \f05(ld  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o=7 -&F.  
     bProcessed=TRUE; kF`2%g+  
    } gCW.;|2  
   } !'[f!vsyM{  
  } ^dld\t:tV7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Jr|"`f%V  
   for(int index=0;index<MAX_KEY;index++){ vQ$FMKz7  
    if(hCallWnd[index]==NULL) ,a_\o&V  
     continue; z1*8 5?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L6O* aZ|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5f jmr  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 fMy7pXa_  
   } 9ssTG4Sa  
  } ">j}!n 8J  
 } C5$1K'X@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i.C+{QH  
} ULNU'6  
I5 "Z  
  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: 9m/v^  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iG!tRNQ{y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Dqs{ n?@n  
$_onSYWr  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %@Bl,!BJ,  
X3 P~z8_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1.6yi];6  
{ WnyEdYA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RQ;pAO  
 { KC[ql}JP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 oYG9i=lZ  
  SaveBmp(); KY~p>Jmh  
  return FALSE; TmxhP nJ~  
 } !uLz%~F  
 …… //其它处理及默认处理 %4*-BCP  
} n<+g{QHi  
[Abq("9p\  
w^6rgCl  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 `A_CLVE  
KmG*`Es  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 W1dpKv  
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  二、编程步骤 d="Oge8  
Dp3&@M"^yY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0z1m!tr  
~oWCTj-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }6*+>?  
D2z" Z@  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 7o_1PwKS6  
j^-E,YMC  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ry)g<OA  
>4 4A  
  5、 添加代码,编译运行程序。 N_Q)AXr)  
DO` K_B  
三、程序代码 ^K. d|z  
Xn@\p5<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hLK5s1#K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0}tf*M+a  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 2.)xWCG  
#if _MSC_VER > 1000 c5C 2xE}T  
#pragma once 094~  s  
#endif // _MSC_VER > 1000 WT;4J<O/  
#ifndef __AFXWIN_H__ #bc$[%_  
#error include 'stdafx.h' before including this file for PCH W5z<+8R  
#endif / Vy pN,  
#include "resource.h" // main symbols t.Q}V5t{g  
class CHookApp : public CWinApp {Rc mjI7  
{ o b;]  
 public: X67^@~l  
  CHookApp(); RdaAS{>Sk  
  // Overrides N1/)F k-z  
  // ClassWizard generated virtual function overrides #[Z ToE4  
  //{{AFX_VIRTUAL(CHookApp) &B ?TX.  
 public: 3>asl54  
  virtual BOOL InitInstance(); O =m_P}K  
  virtual int ExitInstance(); {,xI|u2R  
  //}}AFX_VIRTUAL @D1}).  
  //{{AFX_MSG(CHookApp) W}jel}:  
  // NOTE - the ClassWizard will add and remove member functions here. PIOG| E  
  // DO NOT EDIT what you see in these blocks of generated code ! %EV\nwn6  
  //}}AFX_MSG \vwsRT 1  
  DECLARE_MESSAGE_MAP() eYNu78u   
}; 6bPoC$<Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OD{()E?1B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~C M%WvS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w(Jf;[o  
BOOL InitHotkey(); bvn%E H  
BOOL UnInit(); X?'ShXI  
#endif  rG[iEY  
m-T@Og  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >2v UFq`H  
#include "stdafx.h" QiO4fS'~W  
#include "hook.h" 9|BH/&$  
#include <windowsx.h> d ?Uj3G  
#ifdef _DEBUG <KY \sb9  
#define new DEBUG_NEW @2(7 ZxI  
#undef THIS_FILE [l# 8}dy  
static char THIS_FILE[] = __FILE__; [u*-~(  
#endif 0n dk=V  
#define MAX_KEY 100 l/*NscYtQ  
#define CTRLBIT 0x04 OeMI  
#define ALTBIT 0x02 vX?MB  
#define SHIFTBIT 0x01 c?(;6$A  
#pragma data_seg("shareddata")  #dO8) t  
HHOOK hHook =NULL; skaPC#u  
UINT nHookCount =0; k|uW~ I)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y0}3s)lKv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT fhwJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D@W[Nd5MJ  
static int KeyCount =0; k65V5lb  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  _"0,  
#pragma data_seg() 7+]+S`p  
HINSTANCE hins; ~t=73 fwB  
void VerifyWindow(); iEx sGn]2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]F'o  
//{{AFX_MSG_MAP(CHookApp) = 1ltX+   
// NOTE - the ClassWizard will add and remove mapping macros here. 9!XXuMWU<  
// DO NOT EDIT what you see in these blocks of generated code! 4e`GMtp  
//}}AFX_MSG_MAP V8KdY=[  
END_MESSAGE_MAP() xgp 6lO[  
etw.l~y   
CHookApp::CHookApp() K%jh 6c8  
{ IN^dJ^1+  
 // TODO: add construction code here, OkNBP 0e}  
 // Place all significant initialization in InitInstance 78~;j1^6u  
} J^w!?nk  
<ztcCRov  
CHookApp theApp; \|@u)n_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _s{;9&qX]  
{ WMi$ATq  
 BOOL bProcessed=FALSE; >PbB /->  
 if(HC_ACTION==nCode) ~SzHIVj:6  
 { Nh^ lC  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4 * n4P  
   switch(wParam) I@/s&$H`l  
   { Sgp1p}  
    case VK_MENU: hnYL<<AA  
     MaskBits&=~ALTBIT; fvE:'( #?  
     break; n=F|bW  
    case VK_CONTROL: OK] _.v}  
     MaskBits&=~CTRLBIT; %VH{bpS|i:  
     break; ?z pN09e  
    case VK_SHIFT: 6lAHB*`  
     MaskBits&=~SHIFTBIT; 'G)UIjl  
     break; QJ4=*tX)  
    default: //judge the key and send message ztEM>xsk  
     break; _8 C:Md`  
   } N\{{:<Cp\  
   for(int index=0;index<MAX_KEY;index++){ F[@M?  
    if(hCallWnd[index]==NULL) ?y/LMja  
     continue; L#|6L np^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^{}$o#iof  
    { XM#xxf* Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fW3 awR{  
     bProcessed=TRUE; ~bD'QMk  
    } ?mi1PNps#  
   } t,]E5,1  
  } af-  
  else if((lParam&0xc000ffff)==1){ //Key down 1F,>siuh ,  
   switch(wParam) FW@(MIH  
   { CT0 ~  
    case VK_MENU: a%YohfsY?U  
     MaskBits|=ALTBIT; lKSd]:3Xm  
     break; S_ER^Pkg  
    case VK_CONTROL: }K.2  
     MaskBits|=CTRLBIT; 59MpHkr  
     break; # ? _8 *?  
    case VK_SHIFT: V44M=c7E  
     MaskBits|=SHIFTBIT; DG-XX.:z  
     break; ]jRaR~[UN  
    default: //judge the key and send message B:]%Iu|  
     break; PZ.q  
   } &:?2IAe  
   for(int index=0;index<MAX_KEY;index++) o;"Phc.  
   { "o}}[hRP  
    if(hCallWnd[index]==NULL) o6ag{Yp  
     continue; [/V i*Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oYmLJzCf  
    { 78UE?) X"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %0Mvd;#[  
     bProcessed=TRUE; pd\x^F`sk.  
    } _ `~\zzUZ  
   } ZnNl3MKV  
  } 1m4Xl%KS>  
  if(!bProcessed){ t3 rQ5m  
   for(int index=0;index<MAX_KEY;index++){ GwM(E^AG  
    if(hCallWnd[index]==NULL) 2A(?9 R9&h  
     continue; YIn H8Ex  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vPce6 Cl*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kn9e7OO##  
   } Yc3Rq4I'G  
  } ~YQH]  
 }  ZcE:r+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &cf(}  
} +i@{h9"6g  
I-L:;~.  
BOOL InitHotkey() 0nsjihw  
{ Iw[7;B5v  
 if(hHook!=NULL){ HP(dhsd<c  
  nHookCount++; oD.[T)G?  
  return TRUE; ~\khwNA  
 } O.z\ VI2f  
 else dxi5p!^^9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )aAKxC7w  
  if(hHook!=NULL) !m:rtPD'  
   nHookCount++; U+ANSW/  
  return (hHook!=NULL); .^!<cFkCE  
} TsF>Y""*M  
BOOL UnInit() UfSqiu  
{ =-%10lOI  
 if(nHookCount>1){ PD $' ~2  
  nHookCount--; z,K;GZuP  
  return TRUE; jG{OLF6 !  
 } ERy=lP~gV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); zGNmc7  
 if(unhooked==TRUE){ K /$-H#;N  
  nHookCount=0; <$u\PJF7_^  
  hHook=NULL; !/e*v>3u&  
 } @'<=E AXe  
 return unhooked; uUb`Fy9  
} zpjE_|  
~jzjJ&O&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V8Ri2&|3  
{ c\;_ jg  
 BOOL bAdded=FALSE; G6dUm_iB  
 for(int index=0;index<MAX_KEY;index++){ U C_$5~8p  
  if(hCallWnd[index]==0){ U;j\FE^+>  
   hCallWnd[index]=hWnd; msY6zJc`  
   HotKey[index]=cKey; c:[ ZknnCe  
   HotKeyMask[index]=cMask; ( k,?)  
   bAdded=TRUE; aS``fE ;O  
   KeyCount++; 9Dbbk/j|  
   break; _+.JTk  
  } L5'?.9]  
 } Y?3f Fg  
 return bAdded; [+_>g4M~%  
} 4fL`.n1^  
.TCDv4?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pD('6C;  
{ !hFhw1  
 BOOL bRemoved=FALSE; 4xH/a1&p=  
 for(int index=0;index<MAX_KEY;index++){ G\o9mEzQ  
  if(hCallWnd[index]==hWnd){ J;=T"C&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _N=f&~T  
    hCallWnd[index]=NULL; Nv^b yWqu  
    HotKey[index]=0; 0U~*uDU  
    HotKeyMask[index]=0; ,Ha<lU2K  
    bRemoved=TRUE; U(LLIyZv  
    KeyCount--; +~~2OUL  
    break; 0HUylnXf0  
   } yO}5.  
  } QIg'js$W  
 } C T\@>!'f  
 return bRemoved; 7WwE] ^M  
} b;%t*?t  
lh[?`+A  
void VerifyWindow() Z #T  
{ Z/dhp0k  
 for(int i=0;i<MAX_KEY;i++){ 4Us_Z{.  
  if(hCallWnd!=NULL){ ]x{.qTtw  
   if(!IsWindow(hCallWnd)){ r?IBmatK/  
    hCallWnd=NULL; @mmnr?_w  
    HotKey=0; $rlrR'[H  
    HotKeyMask=0; y/5GY,z%aL  
    KeyCount--; R8_I ASs  
   } 'y=N_/+s  
  } GGf<9!:  
 } uovv">Uw  
} [h8s0  
%~y>9K  
BOOL CHookApp::InitInstance() Sg4{IU  
{ |-)8=QDz)r  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hf^<lJh~=  
 hins=AfxGetInstanceHandle(); :m(DRD  
 InitHotkey(); '_^T]fr}  
 return CWinApp::InitInstance(); #n}~u@,o_  
} 6i2%EC9  
L7d1)mV  
int CHookApp::ExitInstance() 0{g*\W*+~  
{ X6",Xr! {  
 VerifyWindow(); '&'m# H*:  
 UnInit(); 9}u,`&  
 return CWinApp::ExitInstance(); hHGuD2%  
} DY9]$h*y  
OZ+v ~'oD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file yu)^s!UY;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) AYgXqmH~+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u*TC8!n  
#if _MSC_VER > 1000 B\v+C!/f |  
#pragma once Pc_aEBq  
#endif // _MSC_VER > 1000 76wNZv) 9  
}f]Y^>-Ux  
class CCaptureDlg : public CDialog _'LZf=V0  
{ -(t7>s  
 // Construction pF4Z4?W  
 public: u8]FJQ*\6+  
  BOOL bTray; h693TS_N  
  BOOL bRegistered; <^'{=A>  
  BOOL RegisterHotkey(); #{vC =m73  
  UCHAR cKey; t* =[RS*  
  UCHAR cMask; r!+{In+Z  
  void DeleteIcon(); W*t] d  
  void AddIcon(); xH xTL>,?  
  UINT nCount; ~Ix2O   
  void SaveBmp(); 'gvR?[!t  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X!p`|i  
  // Dialog Data %VH,(}i  
  //{{AFX_DATA(CCaptureDlg) nuXL{tg6  
  enum { IDD = IDD_CAPTURE_DIALOG }; =o~GLbsER  
  CComboBox m_Key; sVK?sBs]  
  BOOL m_bControl; p,goYF??  
  BOOL m_bAlt; lQ-<T<g  
  BOOL m_bShift; Jsysk $R  
  CString m_Path;  L23}{P  
  CString m_Number; w?8SQI,~X  
  //}}AFX_DATA ;~EQS.Qp  
  // ClassWizard generated virtual function overrides 5$: toL  
  //{{AFX_VIRTUAL(CCaptureDlg) Aj)Q#Fd[  
 public: xwf-kwF8^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); nUOi~cs  
 protected: L%T(H<G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .VCY|KZ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pA ~} _  
  //}}AFX_VIRTUAL >%k6k1CZ  
  // Implementation  k~ ^4  
 protected: MQQm3VaKS  
  HICON m_hIcon; b,E?{uG  
  // Generated message map functions D&" D[|@  
  //{{AFX_MSG(CCaptureDlg) y %Q. (  
  virtual BOOL OnInitDialog(); <Gi%+I@szl  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); IHni1  
  afx_msg void OnPaint(); 3R3H+W0{  
  afx_msg HCURSOR OnQueryDragIcon(); ~w+I2oS$  
  virtual void OnCancel(); G aV&y  
  afx_msg void OnAbout(); IWQ0I&tzdx  
  afx_msg void OnBrowse(); k*\Bl4g  
  afx_msg void OnChange(); (4T0U5jgT  
 //}}AFX_MSG 5e /YEDP  
 DECLARE_MESSAGE_MAP() x,!Dd  
}; 1)56ec<c  
#endif sD:o 2(G*  
@ph!3<(In,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6O As%QZ  
#include "stdafx.h" #$I@V4O;#  
#include "Capture.h" WVdV:vJ-  
#include "CaptureDlg.h" .|Huz k+  
#include <windowsx.h> UqOBr2 UmG  
#pragma comment(lib,"hook.lib") ;!MQ@Fi^  
#ifdef _DEBUG %.Ma_4o Z  
#define new DEBUG_NEW rm8Ys61\=  
#undef THIS_FILE +;?mg(:  
static char THIS_FILE[] = __FILE__; @-'a{hBR  
#endif SM2Lbfp!u  
#define IDM_SHELL WM_USER+1 mGjB{Q+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tWIs |n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7nek,8b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; HIXAA?_eh=  
class CAboutDlg : public CDialog P:"R;YCvE  
{ YYv0cV{E  
 public: apo)cR  
  CAboutDlg(); |9#q7kM  
  // Dialog Data RdYmh>c  
  //{{AFX_DATA(CAboutDlg) EtKq.<SJ  
  enum { IDD = IDD_ABOUTBOX }; +/~]fI  
  //}}AFX_DATA y9r4]45  
  // ClassWizard generated virtual function overrides >}+{;d  
  //{{AFX_VIRTUAL(CAboutDlg) fg^AEn1i  
 protected: R2,9%!iiX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ]n!V  
  //}}AFX_VIRTUAL Mu\V3`j  
  // Implementation T/_u;My;  
 protected: Mg;pNK\n  
  //{{AFX_MSG(CAboutDlg) E#$Jg|e  
  //}}AFX_MSG Vu:ZG*^  
  DECLARE_MESSAGE_MAP() Q$E.G63Wl  
}; |U%NPw5  
'J,UKK\5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) LwC?t3n  
{ r#sg5aS7O|  
 //{{AFX_DATA_INIT(CAboutDlg) ~#r>@C  
 //}}AFX_DATA_INIT aZN?V}^+  
} FDMQ Lxf  
Zhfp>D  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Uwc%'=@  
{ OS(`H5D  
 CDialog::DoDataExchange(pDX); .z>/A /&+  
 //{{AFX_DATA_MAP(CAboutDlg) B\J[O5},  
 //}}AFX_DATA_MAP j&8YE7  
} 6}^x#9\  
I-]G{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]9oj,k  
 //{{AFX_MSG_MAP(CAboutDlg) -9b=-K.y  
 // No message handlers ;_,jy7lf  
 //}}AFX_MSG_MAP 7Qd4L.  
END_MESSAGE_MAP() *k{Llq  
h`&TDB2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Kxsd@^E  
: CDialog(CCaptureDlg::IDD, pParent) MntmBj-T  
{ SZWNN#w60?  
 //{{AFX_DATA_INIT(CCaptureDlg) )Te\6qM  
  m_bControl = FALSE; Tn7Mt7h  
  m_bAlt = FALSE; Y~UuT8-c  
  m_bShift = FALSE; `% 9Y)a/e  
  m_Path = _T("c:\\"); |! 9~  
  m_Number = _T("0 picture captured."); w <r*&  
  nCount=0; uw+nll*W%  
  bRegistered=FALSE; >z<L60S  
  bTray=FALSE; q,P.)\0A  
 //}}AFX_DATA_INIT xWxHi6U(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *~PB  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LIDi0jbrq  
} S5).\1m h[  
| .jWz.c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bpY*;o$~  
{ ]&8em1  
 CDialog::DoDataExchange(pDX); 3r~8:F"g  
 //{{AFX_DATA_MAP(CCaptureDlg) S Qmn*CW  
  DDX_Control(pDX, IDC_KEY, m_Key); x6/u+Urn  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); v}DNeIh~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); vPnS`&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MXA?rjd0  
  DDX_Text(pDX, IDC_PATH, m_Path); y" =?l  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4@{;z4*`  
 //}}AFX_DATA_MAP zA#pgX[#  
} b 8@}Jv  
i+`8$uz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,a5q62)q  
//{{AFX_MSG_MAP(CCaptureDlg) 4Wl`hF  
 ON_WM_SYSCOMMAND() zZ[kU1Fyv  
 ON_WM_PAINT() `{#""I^_  
 ON_WM_QUERYDRAGICON() AF:_&gF  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) L'wR$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) K3zY-yIco  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3~sV-  
//}}AFX_MSG_MAP [Q T ;~5  
END_MESSAGE_MAP() }R* %q  
l"J#Pvi  
BOOL CCaptureDlg::OnInitDialog() JAxzXAsAR  
{ g3ukx$Q{>  
 CDialog::OnInitDialog(); C^$E#|E9N  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3cJ'tRsp<  
 ASSERT(IDM_ABOUTBOX < 0xF000); #?Ix6 {R  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y>C !cYB  
 if (pSysMenu != NULL)  nS]e  
 { ub?dfS9$_  
  CString strAboutMenu;  KcT(/!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -o/Vp>_UOE  
  if (!strAboutMenu.IsEmpty()) :a8Sy("  
  { *$cx7yJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); %R5- 6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e/4C` J-  
  } `C4(C4u  
 } >:.c?{%g*  
 SetIcon(m_hIcon, TRUE); // Set big icon ^2 dQVV.  
 SetIcon(m_hIcon, FALSE); // Set small icon x}ZXeqt{ {  
 m_Key.SetCurSel(0); zW`Hqt;  
 RegisterHotkey(); ?<J~SF Tt  
 CMenu* pMenu=GetSystemMenu(FALSE); 1 Ne;U/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kiF}+,z"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ",~ZO<P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); );HhV,$n  
 return TRUE; // return TRUE unless you set the focus to a control 2H;#L`Z*  
} Lq3<&$  
6EY\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5xc e1[  
{ whN<{AG  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >JNdtP8s/1  
 { j~b NH~3  
  CAboutDlg dlgAbout; ` { Ox=+]M  
  dlgAbout.DoModal();  c{kpg N  
 } LTf)`SN %'  
 else <mJ8~  
 { 0=+feB1T  
  CDialog::OnSysCommand(nID, lParam); ]R~hzo  
 } {JdXn  
} gR/?MJ(v  
26}3  
void CCaptureDlg::OnPaint() q"269W:  
{ |zRrGQY m  
 if (IsIconic()) BuvnY  
 { ~"*W;|)  
  CPaintDC dc(this); // device context for painting xsU%?"r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _gH$ ,.j/  
  // Center icon in client rectangle Ho#nM_ q  
  int cxIcon = GetSystemMetrics(SM_CXICON); _rSwQ<38>  
  int cyIcon = GetSystemMetrics(SM_CYICON); WXo bh  
  CRect rect; _*z ^PkH  
  GetClientRect(&rect); OeGLMDw  
  int x = (rect.Width() - cxIcon + 1) / 2; F^.]g@g.|  
  int y = (rect.Height() - cyIcon + 1) / 2; U `lp56  
  // Draw the icon a?ete9Q+  
  dc.DrawIcon(x, y, m_hIcon); T: My3&6  
 } y ~-v0/  
 else  "O# V/(  
 { i\ uj>;B  
  CDialog::OnPaint(); <0Y<9+g!  
 } K:13t|  
} ,5U[#6^  
k^d^Todq.  
HCURSOR CCaptureDlg::OnQueryDragIcon() qQf NT.  
{ 7`7M4  
 return (HCURSOR) m_hIcon;  rPr]f;  
} p/eaO{6 6  
ZG+FX:v  
void CCaptureDlg::OnCancel() ES^J RX  
{ !5'4FUlJ  
 if(bTray) s3sD7 @  
  DeleteIcon(); Y4N7# 5  
  CDialog::OnCancel(); 60n>FQ<  
} 2WLLI8  
nWc@ufY  
void CCaptureDlg::OnAbout() e KuF7Oo  
{ yFd.tQs  
 CAboutDlg dlg; u)zv`m  
 dlg.DoModal(); ZJ+ad,?,  
} J(8?6&=ck  
2xUgM}e  
void CCaptureDlg::OnBrowse() "3++S  
{ GwA\>qXw  
 CString str; CL`+\ .  
 BROWSEINFO bi; )zy ;!  
 char name[MAX_PATH]; <l!:#u  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tZx}/&m-  
 bi.hwndOwner=GetSafeHwnd(); amExZ/  
 bi.pszDisplayName=name; s;l"'6:_  
 bi.lpszTitle="Select folder"; *qYw  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )n<p_vz  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "\vQVZd-E  
 if(idl==NULL) *Ej;}KSv  
  return; 0nBDF79  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); b)#rUI|O  
 str.ReleaseBuffer(); s1sn,?  
 m_Path=str; 7}Mnv WP  
 if(str.GetAt(str.GetLength()-1)!='\\') ;xUo(^t7>  
  m_Path+="\\"; `<P:l y.  
 UpdateData(FALSE); T12Zak4.=  
} B1Pi+-t  
2( I4h[  
void CCaptureDlg::SaveBmp() m8 _yorz  
{ M/lC&F(  
 CDC dc; @+~>utr  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vgDpo@fz8  
 CBitmap bm; ZI4dD.B  
 int Width=GetSystemMetrics(SM_CXSCREEN); F/1m&1t  
 int Height=GetSystemMetrics(SM_CYSCREEN); o7Z 8O,;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2yFT` 5+H4  
 CDC tdc; _E8Cvaob  
 tdc.CreateCompatibleDC(&dc); :.=j)ljTx  
 CBitmap*pOld=tdc.SelectObject(&bm); l1`r%9gr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @(*A<2;N  
 tdc.SelectObject(pOld); Zl'/Mx g  
 BITMAP btm; h-O;5.m-P  
 bm.GetBitmap(&btm); _ iDVd2X"H  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; R i,_x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D vU1+ y  
 BITMAPINFOHEADER bih; hbr3.<o1lY  
 bih.biBitCount=btm.bmBitsPixel; a[z$ae7  
 bih.biClrImportant=0; LXJ;8uW2y  
 bih.biClrUsed=0; #*w)rGkU2  
 bih.biCompression=0; Ahbh,U  
 bih.biHeight=btm.bmHeight; {98e_z w  
 bih.biPlanes=1; &tf(vU;,'  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z'uiU e`&  
 bih.biSizeImage=size; 0s{7=Ef  
 bih.biWidth=btm.bmWidth; u>vvW|OB[  
 bih.biXPelsPerMeter=0; j+3rS  
 bih.biYPelsPerMeter=0; ?WqaT)l~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :x5O1Zn/t  
 static int filecount=0; p_]b=3wt~  
 CString name; -F*vN'  
 name.Format("pict%04d.bmp",filecount++);  Pw +nO  
 name=m_Path+name; ?EHheZ{  
 BITMAPFILEHEADER bfh; <s\ZqL$ f  
 bfh.bfReserved1=bfh.bfReserved2=0; h6IXD N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fE)o-q6Z  
 bfh.bfSize=54+size; 6ce-92n  
 bfh.bfOffBits=54; hosY`"X  
 CFile bf; ]jiVe_ OS<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Zo^]y'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); '/X]96Ci7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Jd v;+HN[  
  bf.WriteHuge(lpData,size); '3sySsD&O  
  bf.Close(); $%'3w~h`  
  nCount++; vGPsjxk&  
 } #639N9a~  
 GlobalFreePtr(lpData); dS <*DP  
 if(nCount==1) d+5~^\lV  
  m_Number.Format("%d picture captured.",nCount); {,*vMQ<^  
 else m__pQu:  
  m_Number.Format("%d pictures captured.",nCount); l1O"hd'~s  
  UpdateData(FALSE); uM,Ps}  
} .oLV\'HAR  
uifVSf*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,LSiQmV5  
{ 4$ihnb`DQN  
 if(pMsg -> message == WM_KEYDOWN) v2:i'j6  
 { $?k]KD  
  if(pMsg -> wParam == VK_ESCAPE) ZMiOKVl  
   return TRUE; `F&~SU,  
  if(pMsg -> wParam == VK_RETURN) *TI?tD  
   return TRUE; `]@=Hx(  
 } 6@8z3JW.A  
 return CDialog::PreTranslateMessage(pMsg); U~"Y8g#qgy  
} 7m]J7 +4  
pWv1XTs@t:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q TN)2G  
{ Su? cC/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I_->vC|>  
  SaveBmp(); Z0-?;jA@  
  return FALSE; SA=>9L,2  
} M3|G^q:l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dkCU U  
 CMenu pop; Fzt?M  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )$df6sq  
 CMenu*pMenu=pop.GetSubMenu(0); 3/ }  
 pMenu->SetDefaultItem(ID_EXITICON); Qr7v^H~E4.  
 CPoint pt; GPL%8 YY  
 GetCursorPos(&pt); RB %y($  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LGZa l&9AY  
 if(id==ID_EXITICON) NV9JMB{q  
  DeleteIcon(); K5XW&|tY!  
 else if(id==ID_EXIT) Av5:/c.B  
  OnCancel(); C&*1H`n  
 return FALSE; [ >\|QS|  
} ]PoWL;E'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B {:a,V7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0{8L^ jB/  
 AddIcon(); rJCb8x+5a  
 return res; gM=:80  
} m9i/rK_  
qnj'*]ysBC  
void CCaptureDlg::AddIcon() |rZMcl/  
{ LfFXYX^  
 NOTIFYICONDATA data; $YcB=l  
 data.cbSize=sizeof(NOTIFYICONDATA); btq 4diW  
 CString tip; nQ_{IO8/6W  
 tip.LoadString(IDS_ICONTIP); ~ ) w4Tq  
 data.hIcon=GetIcon(0); i 61k  
 data.hWnd=GetSafeHwnd(); 4:N*C7 P  
 strcpy(data.szTip,tip); c-Yd> 4+ 1  
 data.uCallbackMessage=IDM_SHELL; >-<iY4|[d  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^V96l Kt/  
 data.uID=98; hEsi AbTyF  
 Shell_NotifyIcon(NIM_ADD,&data); C}Kl!  
 ShowWindow(SW_HIDE); 7X/t2Vih@  
 bTray=TRUE; [?KGLUmTAI  
} 5~:/%+F0=  
B,w ZI4oi*  
void CCaptureDlg::DeleteIcon() Ox-eB  
{ emnT;kJ>  
 NOTIFYICONDATA data; Pn[oo_)s  
 data.cbSize=sizeof(NOTIFYICONDATA); M~|7gK.m1  
 data.hWnd=GetSafeHwnd(); /9I/^i~  
 data.uID=98; PS[ C!s&KE  
 Shell_NotifyIcon(NIM_DELETE,&data); }58MDpOF1  
 ShowWindow(SW_SHOW); \ I523$a  
 SetForegroundWindow(); !%('8-x%  
 ShowWindow(SW_SHOWNORMAL); 5ct&fjmR_  
 bTray=FALSE; )rG4Nga5}  
} DHw)]WB M  
Kob,}NgqZ  
void CCaptureDlg::OnChange() +?m.uY(  
{ xHJkzI  
 RegisterHotkey(); zp1ym}9M  
} !@8i(!xb  
VK1B}5/  
BOOL CCaptureDlg::RegisterHotkey() z^Ikb(KC  
{ ozRTY9S _;  
 UpdateData(); 9N}\>L)_  
 UCHAR mask=0; 5Q"w{ n  
 UCHAR key=0; {o)pwM"@(  
 if(m_bControl) ^9q#,6  
  mask|=4; g;8 wP5i  
 if(m_bAlt) 8SKrpwy  
  mask|=2; ~S\L(B(  
 if(m_bShift) % |D)%|Z  
  mask|=1; 0x!&>  
  key=Key_Table[m_Key.GetCurSel()]; @&O4a2+  
 if(bRegistered){ !#O [RS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Hn(1_I%zF  
  bRegistered=FALSE; }>0>OqvF  
 } 4<F z![>  
 cMask=mask; %(lO>4>|  
 cKey=key; CYW@Km{e  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $%cc[[/U  
 return bRegistered; 9 =;mY  
} 4#03x:/<\  
Kh(`6 f  
  四、小结 `/P/2{,~  
Wa<<"x$  
  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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