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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:  75%!R  
  @dGj4h.  
  一、实现方法 Tc{r}y[)  
}y'KS:Jb  
  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: !}U&%2<69  
3rs=EMz:w  
#pragma data_seg("shareddata") X mLHZ,/  
HHOOK hHook =NULL; //钩子句柄 )abo5   
UINT nHookCount =0; //挂接的程序数目 f.Jz]WXw,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]@Q14   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8$S$*[-a  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w_6h $"^x  
static int KeyCount =0; iB{O"l@w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B|#"dhT  
#pragma data_seg() {,,w5/k^  
._#|h5  
  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。 7n5 bI\  
(C1]R41'  
  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: fZ$8PMZv  
wtaeF+u-R-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR s<tdn[d  
cKey,UCHAR cMask) jf@#&%AC9  
{ FK0nQ{uB"  
 BOOL bAdded=FALSE; RaKL KZn  
 for(int index=0;index<MAX_KEY;index++){ VcA87*pel  
  if(hCallWnd[index]==0){ YaDr6)  
   hCallWnd[index]=hWnd; >$k_tC'"  
   HotKey[index]=cKey; X]M)T  
   HotKeyMask[index]=cMask; os"o0?  
   bAdded=TRUE; Busxg?=  
   KeyCount++; }m(u o T~  
   break; &*r YY\I  
  } t\S}eoc  
 } xrS;06$  
 return bAdded; 58{6kJ@  
} nTyK Z(#u  
//删除热键 )Yy`$`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ohOze\T)=  
{  5'Y @c  
 BOOL bRemoved=FALSE; Syo1Dq6z.  
 for(int index=0;index<MAX_KEY;index++){ (ybKACx  
  if(hCallWnd[index]==hWnd){ 5l}v  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?=$a6o  
    hCallWnd[index]=NULL; "xi)GH]H_  
    HotKey[index]=0; )L<NW{  
    HotKeyMask[index]=0; n'K,*  
    bRemoved=TRUE; NN>,dd3T  
    KeyCount--; twq!@C  
    break; \IQf|  
   } %[l5){:05  
  } T32C=7  
 } +' QX`  
 return bRemoved; N[~ RWg  
} )\8l6Gw  
Dqs{ n?@n  
$_onSYWr  
  DLL中的钩子函数如下: ~K5eO-  
X3 P~z8_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4 bw8^  
{ !"Jne'f  
 BOOL bProcessed=FALSE; Ivmiz{Oii  
 if(HC_ACTION==nCode) Ys|tGU  
 { .i) H1sD  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *0^!%Y'/4  
   switch(wParam) T8bk\\Od  
   {  1k EXTs=,  
    case VK_MENU: IVjH.BzH9  
     MaskBits&=~ALTBIT; 9@9(zUS|  
     break; !?,7Cu.5#6  
    case VK_CONTROL: |#^wYZO1U  
     MaskBits&=~CTRLBIT; iimTr_TEt  
     break; @FKm_q  
    case VK_SHIFT: Z%E;*R2+:>  
     MaskBits&=~SHIFTBIT; 4V@raI-  
     break; n6Je5fE  
    default: //judge the key and send message i 3?=up!  
     break; d kVF  
   } dDK4I3a  
   for(int index=0;index<MAX_KEY;index++){ W2?6f:  
    if(hCallWnd[index]==NULL) /zJDQ'k0  
     continue; JR] /\(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l 8qCg/ew  
    { '[Ap/:/UY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .76T<j_  
     bProcessed=TRUE; QpxRYv  
    } !<BJg3  
   } >slD.rb]  
  } S~X&^JvT  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~)xg7\k  
   switch(wParam) M=:!d$c  
   { Ta8;   
    case VK_MENU: -.<fGhmU  
     MaskBits|=ALTBIT; ce7$r*@!  
     break; E!nEB(FD  
    case VK_CONTROL: va 7I_J   
     MaskBits|=CTRLBIT; jeXP|;#Una  
     break; 33IJbg  
    case VK_SHIFT: -}#=L@  
     MaskBits|=SHIFTBIT;  `S$zwot  
     break; W6%\Zwav?)  
    default: //judge the key and send message #; ~`+[y?\  
     break; ?-C=_eZJ  
   } .$&mWytw=  
   for(int index=0;index<MAX_KEY;index++){ =;A p+}  
    if(hCallWnd[index]==NULL) gT8Q:8f:  
     continue; 8S/SXyS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *'[8FZ|dQ  
    { {BPNb{dBKr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?&A)%6` ~  
     bProcessed=TRUE; 69/aP=  
    } m.!n|_}]  
   } mUSrCU_}  
  } 9j<qi\SSI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r&!Ebe-  
   for(int index=0;index<MAX_KEY;index++){ %:Mi6 sR|  
    if(hCallWnd[index]==NULL) T-,T)R`R  
     continue; +U9m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l Oxz&m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n@%Q 2_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {&7%wZ"t_  
   } M:TN^ rA|  
  } 0> {&8:  
 } Ad7N '1O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fz>3  
} ]+4QsoFNt  
T<XGG_NOl  
  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: ^i+ d3  
p6S{OUiG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |y%pJdPk=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GO&~)Vh&7  
.kwz$b+h  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: fL$U%I3  
={g.Fn(_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t"# .I?S0  
{ w1 ;:B%!H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *~Y$8!ad  
 { z3-A2#c  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j}s<Pn%4  
  SaveBmp(); : ;l9to  
  return FALSE; yBKEw(1  
 } s|HpN  
 …… //其它处理及默认处理 ~V34j:  
} _L8|Z V./  
"2'4b  
=#=<%HPT  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 @kh:o\  
k]>1@t  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 WzinEo{ f  
"R<c  
  二、编程步骤 4C:-1gu7  
l7T@<V  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; j(xVbUa  
Budo9z_w  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; I}^Q u0ub  
r,cz yE/  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; xgp 6lO[  
etw.l~y   
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; K%jh 6c8  
IN^dJ^1+  
  5、 添加代码,编译运行程序。 OkNBP 0e}  
^+ J3E4  
三、程序代码 =`st1K  
X mb001  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qQN|\u+co  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z-U-n/6I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wn1` 9  
#if _MSC_VER > 1000 >PbB /->  
#pragma once ~SzHIVj:6  
#endif // _MSC_VER > 1000 dgEH]9j&  
#ifndef __AFXWIN_H__ iVaCXXf'  
#error include 'stdafx.h' before including this file for PCH 6[x6:{^J  
#endif ]&b>P ;j:  
#include "resource.h" // main symbols h/goV  
class CHookApp : public CWinApp {)`tN&\  
{ XfZ^,' z  
 public: 1ze\ U>  
  CHookApp(); @LyCP4   
  // Overrides 2/dvCt6 N  
  // ClassWizard generated virtual function overrides #jqcUno  
  //{{AFX_VIRTUAL(CHookApp) M7`iAa.}  
 public: B0+r  
  virtual BOOL InitInstance(); Z>l%:;H  
  virtual int ExitInstance(); 1Zo"Xb  
  //}}AFX_VIRTUAL 8pXului  
  //{{AFX_MSG(CHookApp) /LK,:6  
  // NOTE - the ClassWizard will add and remove member functions here. 2%Mgg,/~  
  // DO NOT EDIT what you see in these blocks of generated code ! D$?}M>  
  //}}AFX_MSG [ !<  
  DECLARE_MESSAGE_MAP() 0Z4o3r[  
}; -bP_jIZF;g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uN;]Fv@Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ss~yy0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P->.eo#VG  
BOOL InitHotkey(); hU|TP3*  
BOOL UnInit(); gm8FmjZtf  
#endif 'kb|!  
-\|S=< g  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K@<%Vc>L(  
#include "stdafx.h" 3;%dn \ D  
#include "hook.h" 360b`zS  
#include <windowsx.h> %G`GdG}T  
#ifdef _DEBUG ^'G,sZ6'Nh  
#define new DEBUG_NEW KD=W(\  
#undef THIS_FILE o4t6NDa  
static char THIS_FILE[] = __FILE__; }7HR<%< 7  
#endif qdNt2SO  
#define MAX_KEY 100 ISDeLUihY  
#define CTRLBIT 0x04 #d*)W3e2{  
#define ALTBIT 0x02 dX;Q\  ]"  
#define SHIFTBIT 0x01 qP5'&!s&!  
#pragma data_seg("shareddata") BG9.h!  
HHOOK hHook =NULL; h0z>dLA#2  
UINT nHookCount =0; X/qLg+X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Tg jM@ir  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `^mY*Cb e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey BM>'w,$KL  
static int KeyCount =0; &YOks.k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift b?]Lx.l-  
#pragma data_seg() pd\x^F`sk.  
HINSTANCE hins; _ `~\zzUZ  
void VerifyWindow(); efrVF5,y?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xT8pwTO  
//{{AFX_MSG_MAP(CHookApp) Z=.$mFE\  
// NOTE - the ClassWizard will add and remove mapping macros here. yt[vd8O'c  
// DO NOT EDIT what you see in these blocks of generated code! 8`B]UcL)  
//}}AFX_MSG_MAP *Sw1b7l  
END_MESSAGE_MAP() -d)+G%{  
p0sq{d~  
CHookApp::CHookApp() S{ fFpe-  
{ c( 8>|^M  
 // TODO: add construction code here, 0[In5II  
 // Place all significant initialization in InitInstance 61pJVOe  
} .P#+V$qhv  
lS96sjJp@  
CHookApp theApp; We)l_>G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a+=.(g  
{ | k?r1dj%O  
 BOOL bProcessed=FALSE; lO/?e!$  
 if(HC_ACTION==nCode) ]t)#,'$^[W  
 { `|`Qrv 4}  
  if((lParam&0xc0000000)==0xc0000000){// Key up \'hZm%S  
   switch(wParam)   !XQq*  
   { L/KiE+Y  
    case VK_MENU: dxi5p!^^9  
     MaskBits&=~ALTBIT; )aAKxC7w  
     break; !m:rtPD'  
    case VK_CONTROL: U+ANSW/  
     MaskBits&=~CTRLBIT; nvbKW.[<f{  
     break; s9[54 7?`  
    case VK_SHIFT: zEy,aa :M  
     MaskBits&=~SHIFTBIT; TjY-C m  
     break; Kd!.sB/%  
    default: //judge the key and send message 2Fc>6]:*  
     break; SUN!8 qFA  
   } cnraNq1  
   for(int index=0;index<MAX_KEY;index++){ kK~,? l  
    if(hCallWnd[index]==NULL) nm#,oX2C  
     continue; 60z8U#upM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hCpcX"wND  
    { 05 o vz   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); T*{nf  
     bProcessed=TRUE; ZwOX ,D  
    } bnZ~jOHl  
   } bmQ-5SE  
  } >_|$7m.?n[  
  else if((lParam&0xc000ffff)==1){ //Key down 4GqwY"ja  
   switch(wParam) ?:DUsg  
   { d:8c}t2X  
    case VK_MENU: #5X535'ze  
     MaskBits|=ALTBIT; gZ@z}CIw'  
     break; $(fhO   
    case VK_CONTROL: .K`EflN  
     MaskBits|=CTRLBIT; ;ZoEqMv  
     break; wfQ^3HL  
    case VK_SHIFT: wAKm]?zB>  
     MaskBits|=SHIFTBIT; Bdr'd? u<A  
     break; &w%--!T  
    default: //judge the key and send message 0Zh]n;S3m  
     break; ~ UNK[  
   } M2!2 J  
   for(int index=0;index<MAX_KEY;index++) i`^[_  
   { YR-Ge  
    if(hCallWnd[index]==NULL) >/.w80<'  
     continue; #?C.%kD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0s!';g Q  
    { de_%#k1:L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); O)$Pvll  
     bProcessed=TRUE; tA8O( 9OV  
    } Xe2Zf  
   } )skz_a}]8  
  } BcxALRWE  
  if(!bProcessed){ b'%)?{E  
   for(int index=0;index<MAX_KEY;index++){ I7XJPc4}   
    if(hCallWnd[index]==NULL) ?egZkg=U  
     continue; Q N]y.(S)y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A/!"+Yfw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ps_q3Cyp  
   } jSMxba]  
  } 8(>2+#exw  
 } 2 9#jKh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N?2C*|%f  
} u'; 9zk/$  
T#GTNk!v  
BOOL InitHotkey() u*$]Bx  
{ \b*z<Odv  
 if(hHook!=NULL){ Hu$y8_Udw  
  nHookCount++; Zo< j"FG  
  return TRUE; mtmTlGp6Lc  
 } G^V a$ike  
 else ]$i@^3`[w  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8Dkq+H93  
  if(hHook!=NULL) ^*"i *e  
   nHookCount++; ] @:x<>  
  return (hHook!=NULL); [\e/xY(4  
} .Ta(v3om%  
BOOL UnInit() VWK%6Ye0  
{ .: k6Kg  
 if(nHookCount>1){ _tRRIW"Vx"  
  nHookCount--; <Hr~|oG  
  return TRUE; 0X:$ASocU  
 } &grqRt  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K3k{q90   
 if(unhooked==TRUE){ A(*c |Aj9  
  nHookCount=0;  {H*  
  hHook=NULL; ?I$-im  
 } '+\t,>nRkl  
 return unhooked; HR ;I}J 9  
} 20# V?hX3  
l5#SOo\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =!\Y;rk  
{ d ehK#8  
 BOOL bAdded=FALSE; Xe&p.v  
 for(int index=0;index<MAX_KEY;index++){ 6Ey@)p..E  
  if(hCallWnd[index]==0){ waU2C2!w  
   hCallWnd[index]=hWnd; h[mJ=LIrg  
   HotKey[index]=cKey; On|b-  
   HotKeyMask[index]=cMask; 5z&>NI  
   bAdded=TRUE; {1gT{2/~@  
   KeyCount++; ^J;rW3#N8  
   break;  C TKeY  
  } ]iMqIh"  
 } Z~].v._YV)  
 return bAdded; Zo,066'+[.  
} L{rd',  
W{c Z7$d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GVhy }0|  
{ hr!'  
 BOOL bRemoved=FALSE; { [3xi`0-  
 for(int index=0;index<MAX_KEY;index++){ e/&^~ $h  
  if(hCallWnd[index]==hWnd){ O7p=N8V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L5'?.9]  
    hCallWnd[index]=NULL; [{`2FR:Cd  
    HotKey[index]=0; Q' Tg0,,S  
    HotKeyMask[index]=0; '50}QY_R.  
    bRemoved=TRUE; ^HxIy;EQ<z  
    KeyCount--; I1 Otu~%d  
    break; yfal'DqKF  
   } B77`azwF  
  } G\o9mEzQ  
 } J;=T"C&  
 return bRemoved; _N=f&~T  
} Nv^b yWqu  
5YneoM]Q  
void VerifyWindow() >7PNl\=gG  
{ PW82 Vp.  
 for(int i=0;i<MAX_KEY;i++){ Au6Y]  
  if(hCallWnd!=NULL){ .)SR3?   
   if(!IsWindow(hCallWnd)){ f!#+cM  
    hCallWnd=NULL; +w-J;GLSy  
    HotKey=0; a|jZg  
    HotKeyMask=0; 3I(;c ,S  
    KeyCount--; K:^0*5Y-k  
   } `2hg?(ul  
  } w {"1V7|  
 } 91]sO%3  
} k<5g  
>ZW|wpO  
BOOL CHookApp::InitInstance() Z/dhp0k  
{ 4Us_Z{.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]x{.qTtw  
 hins=AfxGetInstanceHandle(); \EsT1aT  
 InitHotkey(); ~>HzAo9e  
 return CWinApp::InitInstance(); $ nHD,h  
} TkJ[N4'0  
#f< v%  
int CHookApp::ExitInstance() aHVzBcCPh  
{ #y[U2s Se  
 VerifyWindow(); Ij$C@hH  
 UnInit(); !?v_.  
 return CWinApp::ExitInstance(); !LzA  
} !sSq4K  
Mc <u?H  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bK.*v4RG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) WN<g _8QR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U2l3E*O  
#if _MSC_VER > 1000 ,uAp;"YJeV  
#pragma once Bp3E)l  
#endif // _MSC_VER > 1000 <N1wET-  
B]@25  
class CCaptureDlg : public CDialog FJ-H ;  
{ XbqMWQN*  
 // Construction ]8}51y8  
 public: o<G#%9j  
  BOOL bTray; "VZXi_P  
  BOOL bRegistered; #c5jCy}n  
  BOOL RegisterHotkey(); fx(h fz  
  UCHAR cKey; Pc_aEBq  
  UCHAR cMask; D}q"^"#T  
  void DeleteIcon(); "4;nnq  
  void AddIcon(); 8! rdqI   
  UINT nCount; ICvV}%d  
  void SaveBmp(); pF4Z4?W  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor K)BQ0v.:[  
  // Dialog Data 0/b  _T  
  //{{AFX_DATA(CCaptureDlg) h%krA<G9  
  enum { IDD = IDD_CAPTURE_DIALOG }; o6d x\  
  CComboBox m_Key; t* =[RS*  
  BOOL m_bControl; ATl?./Tu  
  BOOL m_bAlt; _$ivN!k  
  BOOL m_bShift; xH xTL>,?  
  CString m_Path; ~Ix2O   
  CString m_Number; 'gvR?[!t  
  //}}AFX_DATA l6y}>]  
  // ClassWizard generated virtual function overrides W3:Fw6v  
  //{{AFX_VIRTUAL(CCaptureDlg) nuXL{tg6  
 public: 0] kKF<s  
  virtual BOOL PreTranslateMessage(MSG* pMsg); D%abBE1  
 protected: USEb} M`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0z8?6~M;<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jsysk $R  
  //}}AFX_VIRTUAL  L23}{P  
  // Implementation Q-n8~Ey1a  
 protected: ;~EQS.Qp  
  HICON m_hIcon; d51'[?(  
  // Generated message map functions viG,z4Zf  
  //{{AFX_MSG(CCaptureDlg) Ic9L@2m  
  virtual BOOL OnInitDialog(); ,-4NSli  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F5Z,Jmi^M  
  afx_msg void OnPaint(); d=PX}o^  
  afx_msg HCURSOR OnQueryDragIcon(); _r*\ BM8y  
  virtual void OnCancel(); jYFJk&c  
  afx_msg void OnAbout(); [/CGV8+  
  afx_msg void OnBrowse(); a:fP  
  afx_msg void OnChange(); U}RBgPX!  
 //}}AFX_MSG UowvkVa  
 DECLARE_MESSAGE_MAP() y %Q. (  
}; bI55G#1G  
#endif h 6Z:+  
@"-\e|[N  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f9W:-00QD  
#include "stdafx.h" kFv*>>X`  
#include "Capture.h" ('tXv"fT  
#include "CaptureDlg.h" Dz(\ ?  
#include <windowsx.h> S^eem_C  
#pragma comment(lib,"hook.lib") y|2<Vc  
#ifdef _DEBUG x,!Dd  
#define new DEBUG_NEW (?fU l$q\  
#undef THIS_FILE <X:JMj+  
static char THIS_FILE[] = __FILE__; x#J9GP.  
#endif gSz<K.CT  
#define IDM_SHELL WM_USER+1 x9"Cm;H%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H OR8Jwf:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9{*{Ba  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P.'.KZJ:WD  
class CAboutDlg : public CDialog @up,5`  
{ 3m1(l?fp  
 public: q(?+01  
  CAboutDlg(); rD].=.?1  
  // Dialog Data Nmj)TOEPW  
  //{{AFX_DATA(CAboutDlg) mGjB{Q+  
  enum { IDD = IDD_ABOUTBOX }; tWIs |n  
  //}}AFX_DATA 9 {&g.+  
  // ClassWizard generated virtual function overrides HIXAA?_eh=  
  //{{AFX_VIRTUAL(CAboutDlg) JWix Y/  
 protected: ^#Ha H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support apo)cR  
  //}}AFX_VIRTUAL An{>39{  
  // Implementation Y%XF64)6  
 protected: *siX:?l  
  //{{AFX_MSG(CAboutDlg) ~U0%}Bbh  
  //}}AFX_MSG |O{N_-];.  
  DECLARE_MESSAGE_MAP() &-3 e3)  
}; X 0G,tl  
"mK`3</G  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N1a]y/  
{ gV2vwe  
 //{{AFX_DATA_INIT(CAboutDlg) c*;oR$VW  
 //}}AFX_DATA_INIT m,k 0 h%  
} IZ=Z=k{  
3iCe5VF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S,c{LTL  
{ 42NfD/"g+s  
 CDialog::DoDataExchange(pDX); L  ;L:  
 //{{AFX_DATA_MAP(CAboutDlg) --K) 7  
 //}}AFX_DATA_MAP !l (Vk  
} T$5wH )<  
(?jK|_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2~kx3` Q  
 //{{AFX_MSG_MAP(CAboutDlg) ^kKLi  
 // No message handlers )9YDNVo*-  
 //}}AFX_MSG_MAP ZnEgU}g<2  
END_MESSAGE_MAP() jHFjd'  
0D(8-H  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) OS(`H5D  
: CDialog(CCaptureDlg::IDD, pParent) .z>/A /&+  
{ x MJ-=  
 //{{AFX_DATA_INIT(CCaptureDlg)  FA+HR  
  m_bControl = FALSE; 6}^x#9\  
  m_bAlt = FALSE; y2A\7&7  
  m_bShift = FALSE; @t%da^-HS"  
  m_Path = _T("c:\\"); .U!EA0B  
  m_Number = _T("0 picture captured."); p<mL%3s0  
  nCount=0; :Y99L)+=/  
  bRegistered=FALSE; &}"kF\  
  bTray=FALSE; X+4Uh I  
 //}}AFX_DATA_INIT 9@*pC@I)  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h4hAzFQ.s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?"yjgt7+y  
} !j6 k]BgZ  
s41%A2Enh  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <Wn~s=  
{ + -<8^y  
 CDialog::DoDataExchange(pDX); [vi =^  
 //{{AFX_DATA_MAP(CCaptureDlg) /5,6 {R9  
  DDX_Control(pDX, IDC_KEY, m_Key); S7+>Mk  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); y\FQt];z)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u$\.aWol  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #{6VdWZ  
  DDX_Text(pDX, IDC_PATH, m_Path); xWxHi6U(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *~PB  
 //}}AFX_DATA_MAP mdc?~??8  
} A;co1,]gR  
-H6 0T,o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G*=HjLmZg  
//{{AFX_MSG_MAP(CCaptureDlg) Y=XDN:  
 ON_WM_SYSCOMMAND() sp\6-*F  
 ON_WM_PAINT() 6tH}&#K  
 ON_WM_QUERYDRAGICON() G8repY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6s@!Yn|?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v}DNeIh~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7ys' [G|}r  
//}}AFX_MSG_MAP @K"$M>n$Z  
END_MESSAGE_MAP() OX;bA^+}P  
O60T.MM`  
BOOL CCaptureDlg::OnInitDialog() h% -=8l,  
{ JI@iT6.%IX  
 CDialog::OnInitDialog(); *d8 %FQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +3))G  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]xS%E r  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ie1~QQ  
 if (pSysMenu != NULL) Z\0wQ;}  
 { %DttkrhL  
  CString strAboutMenu; T!x/^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); E2zL-ft.  
  if (!strAboutMenu.IsEmpty()) 4rhHvp  
  { @WazSL;N  
   pSysMenu->AppendMenu(MF_SEPARATOR); (Aw@}!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R~=c1bpdq  
  } qjRbsD>  
 } g0 Q,]\~  
 SetIcon(m_hIcon, TRUE); // Set big icon iZ]^JPU}  
 SetIcon(m_hIcon, FALSE); // Set small icon rO}1E<g (  
 m_Key.SetCurSel(0); %p\ ~  
 RegisterHotkey(); Aw7N'0K9UN  
 CMenu* pMenu=GetSystemMenu(FALSE); 3ML^ dZ'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u&*[   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~=yU%5 s@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *L<EGFP  
 return TRUE; // return TRUE unless you set the focus to a control f#c}}>V8  
} 6GuTd  
MgiW9@_(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CV[9i  
{ |21V OPBS  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $}4ao2  
 {  D?Beg F  
  CAboutDlg dlgAbout; r;@0 F  
  dlgAbout.DoModal(); Eq_@ xT0>  
 } 24od74\  
 else Af\@J6viF7  
 { EuHQp7  
  CDialog::OnSysCommand(nID, lParam); );HhV,$n  
 } z^wod  
} p4uzw  
U>n[R/~]  
void CCaptureDlg::OnPaint() ,L%]}8EL"  
{ M[985bl  
 if (IsIconic()) ~JRq :  
 { ;Q t%>Uo8  
  CPaintDC dc(this); // device context for painting |ghyH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KEy8EB  
  // Center icon in client rectangle uBG!R#T  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7oC8I D  
  int cyIcon = GetSystemMetrics(SM_CYICON); SEnr"}  
  CRect rect; PC5$TJnj3  
  GetClientRect(&rect);  qbc=kP  
  int x = (rect.Width() - cxIcon + 1) / 2; /{j._4c  
  int y = (rect.Height() - cyIcon + 1) / 2; ,./ n@.na  
  // Draw the icon 2(uh7#Q  
  dc.DrawIcon(x, y, m_hIcon); y=Eb->a){  
 }  3B]E2  
 else #+<YFm\i  
 { x'-gvbj!  
  CDialog::OnPaint(); ;~1xhpTk  
 } w.rcYywI  
} B|o@ |zF  
J<0sT=/2$  
HCURSOR CCaptureDlg::OnQueryDragIcon() {*;K>%r\o  
{ P*[wB_^&UP  
 return (HCURSOR) m_hIcon; E;H9]*x/  
} pa^_D~  
H{*rV>%  
void CCaptureDlg::OnCancel() |J@ &lBlq  
{ P\@kqf~pC  
 if(bTray) uNEl]Q]<e]  
  DeleteIcon(); mY=sh{ir  
  CDialog::OnCancel(); *|q{(KX  
} B3yTN6-  
GsO(\hR6^  
void CCaptureDlg::OnAbout() Z6b]EcP)#  
{ D\;5{,:d  
 CAboutDlg dlg; ;mI^J=V3  
 dlg.DoModal(); ,n%b~.$:v5  
} ,dd1/zm  
ml2/}}  
void CCaptureDlg::OnBrowse() AP`1hz4].-  
{ ~[F7M{LS  
 CString str; GfSD% "  
 BROWSEINFO bi; h}tC +_"D  
 char name[MAX_PATH]; {ZdF6~+H(!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); WNeBthq6  
 bi.hwndOwner=GetSafeHwnd(); *oLDy1<  
 bi.pszDisplayName=name; "1\GU1x  
 bi.lpszTitle="Select folder"; -k:x e:$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,yp#!gE~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @8w[Zo~  
 if(idl==NULL) EhKG"Lb+  
  return; #Mk3cp^Yl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); E>/~:  
 str.ReleaseBuffer(); 5MYdLAjV  
 m_Path=str; #" "T>+  
 if(str.GetAt(str.GetLength()-1)!='\\') oP T)vN?  
  m_Path+="\\"; ?x 0gI   
 UpdateData(FALSE); $v_&j E  
} n2_;:=  
#%%!r$UL  
void CCaptureDlg::SaveBmp() ePq(.o  
{ & E6V'*<93  
 CDC dc; "\vQVZd-E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;,uATd|  
 CBitmap bm; !5h8sD;  
 int Width=GetSystemMetrics(SM_CXSCREEN); d"E3ypPK  
 int Height=GetSystemMetrics(SM_CYSCREEN); T#6g5Jnsp  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Kwm_Y5`A  
 CDC tdc; X. Ur`X  
 tdc.CreateCompatibleDC(&dc); LN.*gG l  
 CBitmap*pOld=tdc.SelectObject(&bm); \N-3JOVy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F+NX [  
 tdc.SelectObject(pOld); U8gj\G\`  
 BITMAP btm; 3mopTzs)  
 bm.GetBitmap(&btm); 7;Lv_Y"b  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1he5Zevm}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v>nBdpjXh  
 BITMAPINFOHEADER bih; rtbV*@Z  
 bih.biBitCount=btm.bmBitsPixel; p(="73  
 bih.biClrImportant=0; AEx VKy  
 bih.biClrUsed=0; 0Ntvd7"`}  
 bih.biCompression=0; eU`O=uE   
 bih.biHeight=btm.bmHeight; ^7i7yM}6(  
 bih.biPlanes=1; h {zb)'R  
 bih.biSize=sizeof(BITMAPINFOHEADER); =_ j<x$,b-  
 bih.biSizeImage=size; Al@. KTK  
 bih.biWidth=btm.bmWidth; 3*\Q]|SI!  
 bih.biXPelsPerMeter=0; SHB'g){P  
 bih.biYPelsPerMeter=0; WrRY 3X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BHU$QX  
 static int filecount=0; /ece}7M  
 CString name; IG\Cj7{K^  
 name.Format("pict%04d.bmp",filecount++); VR1[-OE  
 name=m_Path+name; z6;hFcO  
 BITMAPFILEHEADER bfh; oC} u  
 bfh.bfReserved1=bfh.bfReserved2=0; q7_Ttjn-DV  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $B<:SuV#  
 bfh.bfSize=54+size; rH,@"( p\  
 bfh.bfOffBits=54; ;/pI@C k  
 CFile bf; VpB)5>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KXl!VD,#`=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TF!v,cX  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p_]b=3wt~  
  bf.WriteHuge(lpData,size); -F*vN'  
  bf.Close();  Pw +nO  
  nCount++; [MKG5=kaE  
 } Qm*ZOz'i  
 GlobalFreePtr(lpData); ? * ,  
 if(nCount==1)  f9<"  
  m_Number.Format("%d picture captured.",nCount); \RPwSx  
 else |v : )9  
  m_Number.Format("%d pictures captured.",nCount); dKD:mU",M  
  UpdateData(FALSE); %,<Ki]F  
} ."O%pL]!/b  
h 6?Z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z$~F9Es9  
{ I S'Uuuz7g  
 if(pMsg -> message == WM_KEYDOWN) Ol h{<~Fv  
 { '|yCDBu  
  if(pMsg -> wParam == VK_ESCAPE) @OFxnF`  
   return TRUE; X6(s][Wn  
  if(pMsg -> wParam == VK_RETURN)  \G)F*  
   return TRUE; 9iM%kY#)W  
 } h~CLJoK<  
 return CDialog::PreTranslateMessage(pMsg); .,#H]?Wil  
} j`$$BVZ  
7Nk|9t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $)X8'1%6  
{ KUm?gFh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P7Qel,  
  SaveBmp(); gJ9"$fIPc  
  return FALSE; e3p:lu  
} Ok\X%avq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Q[q`)~|  
 CMenu pop; *TI?tD  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )u=W?5%=}  
 CMenu*pMenu=pop.GetSubMenu(0); y5O &9Ckw  
 pMenu->SetDefaultItem(ID_EXITICON); 79d(UG'O  
 CPoint pt; PXJ7Ek*/  
 GetCursorPos(&pt); WK7?~R%rq  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); E'U x2sh  
 if(id==ID_EXITICON) g3{UP]Z71  
  DeleteIcon(); 5U+4vV/*  
 else if(id==ID_EXIT) O1t$]k:  
  OnCancel(); +w?R4Sxjn  
 return FALSE; IPYwUix  
} to,\n"$~!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xh9$ZavB*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `JPkho  
 AddIcon(); )7 8T+7Kq  
 return res; NV9JMB{q  
} iI7ocyUv  
x{<l8vL=-c  
void CCaptureDlg::AddIcon() .PR+_a-X  
{ q}VdPt>X/  
 NOTIFYICONDATA data; ~gMt U  
 data.cbSize=sizeof(NOTIFYICONDATA); +Y~5197V  
 CString tip; !3mt<i]a"  
 tip.LoadString(IDS_ICONTIP); Myiv#rQ)  
 data.hIcon=GetIcon(0); H, :]S-T  
 data.hWnd=GetSafeHwnd(); oo7}Hg>  
 strcpy(data.szTip,tip); Dat',5  
 data.uCallbackMessage=IDM_SHELL; fHH  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; i 61k  
 data.uID=98; S 593wfc  
 Shell_NotifyIcon(NIM_ADD,&data); CPRVSN0b{4  
 ShowWindow(SW_HIDE); hEsi AbTyF  
 bTray=TRUE; u{\'/c7G  
} FN=WU< 5  
|C<#M<  
void CCaptureDlg::DeleteIcon() ) =29Hm"  
{ rZaO^}u]  
 NOTIFYICONDATA data; Z f\~Cl  
 data.cbSize=sizeof(NOTIFYICONDATA); +s"6[\H1d  
 data.hWnd=GetSafeHwnd(); S**eI<QFSk  
 data.uID=98; @v#P u_  
 Shell_NotifyIcon(NIM_DELETE,&data); \i%mokfbc  
 ShowWindow(SW_SHOW); (4A'$O2  
 SetForegroundWindow(); [x>Ju&))$  
 ShowWindow(SW_SHOWNORMAL); 9CeR^/i  
 bTray=FALSE; 6:Z8d%Z  
} tLfhW1"  
3Ioe#*5\  
void CCaptureDlg::OnChange() =uAy/S  
{ wT::b V{  
 RegisterHotkey(); GjHR.p?-  
} q=BljSX  
!@8i(!xb  
BOOL CCaptureDlg::RegisterHotkey() T+$H[ &j  
{ }F_c0zM  
 UpdateData(); KbvMp1'9P  
 UCHAR mask=0; Z CPUNtOl  
 UCHAR key=0; fTvm2+.nX  
 if(m_bControl) Q zaD\^OF  
  mask|=4; z"UC$  
 if(m_bAlt) }P fAf  
  mask|=2; A&~fw^HM  
 if(m_bShift) Op ?"G  
  mask|=1; ^sLx3a  
  key=Key_Table[m_Key.GetCurSel()]; "W(Ae="60  
 if(bRegistered){ +W*~=*h|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); y@!o&,,mq  
  bRegistered=FALSE; lYQ|NL():  
 } qclc--fsE  
 cMask=mask; }>0>OqvF  
 cKey=key; yivu|q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \?^2}K/  
 return bRegistered; Z}dK6h5+'  
} e:9EP,  
V1V0T ,  
  四、小结 ~RuX2u-2&u  
Q,xL8i M,  
  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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