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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: cQT1Xi  
  `'p`PyMt`  
  一、实现方法 rIeM+h7Wn  
uAu( +zV2  
  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: 8[{|xh(  
eo1&.FQu  
#pragma data_seg("shareddata") $sEB'>:  
HHOOK hHook =NULL; //钩子句柄 umQi  
UINT nHookCount =0; //挂接的程序数目 \F 3C=M@:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &/s~? Iq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hPa n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0iYP  
static int KeyCount =0; u3]Uxy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9nn>O?  
#pragma data_seg() `#u l,%  
QU:EY'2  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 2;:lK":  
(%[Tk[  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 6|,e%  
i{8]'fM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E;6~R M:  
cKey,UCHAR cMask) 8N% z9b  
{ s=MT,  
 BOOL bAdded=FALSE; /D0RC  
 for(int index=0;index<MAX_KEY;index++){ 9b1?W?"  
  if(hCallWnd[index]==0){ CoU3S,;*  
   hCallWnd[index]=hWnd; zI:(33)  
   HotKey[index]=cKey; :$=|7v  
   HotKeyMask[index]=cMask; AHwG<k  
   bAdded=TRUE; lR:?uZ$  
   KeyCount++; & g:%*>7P  
   break; MY!q%  
  } ;{k=C2  
 } O#Z/+\U  
 return bAdded; .(|+oHg<  
} +'|{1gB  
//删除热键 Z==!C=SBv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F;u7A]H^  
{ vQ 4}WtvA  
 BOOL bRemoved=FALSE; 8lwFAiC8  
 for(int index=0;index<MAX_KEY;index++){ ~Rs#|JWB2V  
  if(hCallWnd[index]==hWnd){ /HkFlfPd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ i'HPRY  
    hCallWnd[index]=NULL; iU5P$7.p  
    HotKey[index]=0; /s:w^ g~  
    HotKeyMask[index]=0; gE\b 982  
    bRemoved=TRUE; RvyuGU  
    KeyCount--; O~27/  
    break; QdDObqVdy  
   } 9~c~E/4!  
  } 1"?]= j:  
 } :Hk_8J  
 return bRemoved; /v|Onq1Y4  
} _1  p DA  
/Pvk),ca  
nL+p~Hi  
  DLL中的钩子函数如下: o'Wz*oY))\  
5;mRGY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q\R q!7(  
{ BX[~% iE  
 BOOL bProcessed=FALSE; edijfhn  
 if(HC_ACTION==nCode) J!hFN]M<<  
 { EyY],W1 Y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $W&:(&  
   switch(wParam) dv~pddOs  
   {  -#.< 12M  
    case VK_MENU: nA_%2F'W}  
     MaskBits&=~ALTBIT; iA'As%S1  
     break; Izn T|l^  
    case VK_CONTROL: K]/Od  
     MaskBits&=~CTRLBIT; >{5 p0  
     break; 1u~ MXGF  
    case VK_SHIFT: #DFp[\)1  
     MaskBits&=~SHIFTBIT; 53Yxz3v  
     break; PcC/_+2  
    default: //judge the key and send message _c2WqQ-05  
     break; JoZ(_Jh%m  
   } A]o4Mf0>I  
   for(int index=0;index<MAX_KEY;index++){ ObG=>WPJa  
    if(hCallWnd[index]==NULL) *k [J6  
     continue; &Z;_TN9[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W:`#% :C  
    { w0w1PE-V=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kWhr1wR1  
     bProcessed=TRUE; ?9mkRd}c  
    } 5~'IKcW<  
   } ]< XR]FHx)  
  } v2)g 1sXd  
  else if((lParam&0xc000ffff)==1){ //有键按下 8wK ~ i  
   switch(wParam) ' cBBt  
   { uw AwWgl  
    case VK_MENU: @1-F^G%p8  
     MaskBits|=ALTBIT; (JUZCP/\  
     break; n,$z>  
    case VK_CONTROL: Jr;jRe`4c  
     MaskBits|=CTRLBIT; % 0T+t.  
     break; "=1;0uy]  
    case VK_SHIFT: *\G)z|^yx  
     MaskBits|=SHIFTBIT; p{D4"Qn+P9  
     break; Gl}Qxv#$  
    default: //judge the key and send message @-&MA)SN  
     break; T-_"|-k}P%  
   } =(HeF.!  
   for(int index=0;index<MAX_KEY;index++){ 3Ot~!AlR  
    if(hCallWnd[index]==NULL) RY9V~8|M  
     continue; c{3wk7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E"~2./+rd  
    { /Ncm^b4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9X$ma/P[  
     bProcessed=TRUE; a<~77~"4wn  
    } eHiy,IN  
   } 47K1$3P  
  } 9(4&KZpK  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R?o$Y6}5  
   for(int index=0;index<MAX_KEY;index++){ c!K]J  
    if(hCallWnd[index]==NULL) *Hz^K0:8(  
     continue; f+_h !j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z?5V4F:f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =O).Lx2J  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "A$!, PX6  
   } ` Ag{)  
  } **3 z;58i  
 } 9iUrnG*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q 11IkDa  
} p Z: F:  
TS2ZF{m  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Uu 8,@W+  
EJ@p-}I!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4db(<h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *z*uEcitW  
c2t=_aAIPQ  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Y_woKc*  
G3G#ep~)vC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F8:vDv  
{ Zwz&rIQpT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ",7Q   
 { C?Bl{4-P}*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #|&Sc_#4)  
  SaveBmp(); 1i[FY?6`dh  
  return FALSE; YG [;"QR  
 } #9-P%%kQ  
 …… //其它处理及默认处理 (0YZZ93  
} SN7"7joP<  
SCvVt  
#txE=e"&o  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 /+Lfrt  
AV9m_hZ t  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 |KSy`lY-j>  
7Mb# O_eh  
  二、编程步骤 ojyIQk+  
S"wR%\NIp  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 7(5xL T$  
5[0 O'%$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =  C4  
EkgE_8  
  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; &e 6CJ  
&wD;SMr<  
  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; 35E_W>n  
:8CvRO*<  
  5、 添加代码,编译运行程序。 1$M@]7e+!+  
wr[,  
三、程序代码 At7>V-f}  
^6_e=jIN  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UfN&v >8f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) KMI_zhyB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0"CG7Vg,zh  
#if _MSC_VER > 1000 ^*P%=>zO  
#pragma once &|f@$ff  
#endif // _MSC_VER > 1000 8GvJ0Jq}U  
#ifndef __AFXWIN_H__ Hemq +]6^  
#error include 'stdafx.h' before including this file for PCH 5R(/Uiv3F  
#endif \,u_7y2 c  
#include "resource.h" // main symbols sZx/Ee   
class CHookApp : public CWinApp At-U2a#J{  
{ ne 4Q#P  
 public: 'nXl>  
  CHookApp(); C(00<~JC  
  // Overrides S30?VG9U0f  
  // ClassWizard generated virtual function overrides kS bu]AB  
  //{{AFX_VIRTUAL(CHookApp) emCM\|NQg&  
 public: ek#O3Oz  
  virtual BOOL InitInstance(); S H!  
  virtual int ExitInstance(); 6Yx4lWBR?  
  //}}AFX_VIRTUAL .Fdgb4>BXX  
  //{{AFX_MSG(CHookApp) ;W>k@L  
  // NOTE - the ClassWizard will add and remove member functions here. l c+g&f  
  // DO NOT EDIT what you see in these blocks of generated code ! 9 FB19  
  //}}AFX_MSG -r-k_6QP  
  DECLARE_MESSAGE_MAP() ^J$2?!~  
}; R8ZK]5{o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); spt6]"Ni  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KXx32 b,~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q_[ 3`j l  
BOOL InitHotkey(); <YdE1{fm  
BOOL UnInit(); z^'gx@YD*v  
#endif S:h{2{  
0u;4%}pD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |Y?H A&  
#include "stdafx.h" zd @m~V  
#include "hook.h" <1uZa  
#include <windowsx.h> 7Zlw^'q$:L  
#ifdef _DEBUG wK?vPS  
#define new DEBUG_NEW WA+iYLx@H  
#undef THIS_FILE ,yiX# ;j  
static char THIS_FILE[] = __FILE__; Mu+0<>   
#endif ~_/(t'9  
#define MAX_KEY 100 "*In+!K  
#define CTRLBIT 0x04 7pe\M/kl  
#define ALTBIT 0x02 vX/T3WV  
#define SHIFTBIT 0x01 A"L&a l$i  
#pragma data_seg("shareddata") #ZB~ x6i6  
HHOOK hHook =NULL; Yt;MV)  
UINT nHookCount =0; wOU_*uY@6'  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ML|FQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9[<)WQe6M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey RW<D<5C  
static int KeyCount =0; <g"{Wv: h  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Y$"O VC  
#pragma data_seg() %5(I/zB  
HINSTANCE hins; jYk&/@`Ly  
void VerifyWindow(); #d6)#:uss  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hb}+A=A=+  
//{{AFX_MSG_MAP(CHookApp) ynthDE o  
// NOTE - the ClassWizard will add and remove mapping macros here. ? m DI#~)  
// DO NOT EDIT what you see in these blocks of generated code! E|iQc8gr&  
//}}AFX_MSG_MAP F(>Np2oi6  
END_MESSAGE_MAP() 1*\o.  
LY%WD%pL  
CHookApp::CHookApp() Q+[n91ey**  
{ 4K\G16'$v  
 // TODO: add construction code here, 8Vr%n2M  
 // Place all significant initialization in InitInstance AE[b},-[  
} JRB9rSN^  
l3)} qu  
CHookApp theApp; oKuI0-*mR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "&Y`+0S8  
{ k>;`FFQU>  
 BOOL bProcessed=FALSE; HiZ*+T.B  
 if(HC_ACTION==nCode) G?O1>?4C  
 { nT7%j{e=L  
  if((lParam&0xc0000000)==0xc0000000){// Key up r>>%2Z-P  
   switch(wParam) T&6l$1J  
   { eA2@Nkw~)  
    case VK_MENU: -|$@-fY;  
     MaskBits&=~ALTBIT; >;e~WF>+K  
     break; ,E S0NA  
    case VK_CONTROL: C5o#i*|  
     MaskBits&=~CTRLBIT; Y]'Z7<U}*E  
     break; Va"0>KX  
    case VK_SHIFT: *4\:8  
     MaskBits&=~SHIFTBIT; ;U/&I3dzV  
     break; ag [ZW  
    default: //judge the key and send message "\: `/k3  
     break; +r2+X:#~T  
   } ]d$8f  
   for(int index=0;index<MAX_KEY;index++){ "@V Y  
    if(hCallWnd[index]==NULL) j()7_  
     continue; hOjk3 k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oB(?_No7  
    { cr7 }^s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _kef 0K6  
     bProcessed=TRUE; ]L5@,E4.  
    } =^M/{51j  
   } L/$H"YOv  
  } %O|iE M  
  else if((lParam&0xc000ffff)==1){ //Key down Ag-(5:  
   switch(wParam) 8\&X2[oAD  
   { XO.jl"xu  
    case VK_MENU: <? q?Mn  
     MaskBits|=ALTBIT; *#,7d"6W5  
     break; n(1l}TJy  
    case VK_CONTROL: J!dm-L  
     MaskBits|=CTRLBIT; D+lAhEN  
     break; .s?L^Z^  
    case VK_SHIFT: #NEE7'&S  
     MaskBits|=SHIFTBIT; L>jY.d2w=K  
     break; {'7B6  
    default: //judge the key and send message - YEZ]:"  
     break; /6)<}#  
   } *& BQTZ6  
   for(int index=0;index<MAX_KEY;index++) xQ f*  
   { BtkOnbz8X  
    if(hCallWnd[index]==NULL) 3#3n!(  
     continue; bQg c8/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t% d Z-Ym  
    { 0yk]o5a++  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rD*jp6Cl  
     bProcessed=TRUE; cN/6SGHK  
    } p $S*dr  
   } ;AG8C#_  
  } y6(Z`lx  
  if(!bProcessed){ u|\1h LXX  
   for(int index=0;index<MAX_KEY;index++){ 3#LlDC_WC  
    if(hCallWnd[index]==NULL) %z=le7  
     continue; =9H7N]*h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vr3Zu{&2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KjD/o?JUr  
   } "Wct({n  
  } 7`*h2 mgY  
 } ROH|PKb7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {:/#Nc$5  
} .73X3`P25  
j*|VctM  
BOOL InitHotkey() =/@D8{pU  
{ 0{5w 6  
 if(hHook!=NULL){ E^ B'4  
  nHookCount++; L^1NY3=$  
  return TRUE; ( >LF(ll  
 } ju8> :y8  
 else 1KU! tL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Cwv9 a^  
  if(hHook!=NULL) hZ|z|!g0  
   nHookCount++; )HEa<P^kJl  
  return (hHook!=NULL); Ki;*u_4{  
} xK>*yV  
BOOL UnInit() 3(>B Ke  
{ )*u8/U  
 if(nHookCount>1){ `}p0VmD{NE  
  nHookCount--; iDpSj!x/_  
  return TRUE; mVj9, q0  
 } ./\@Km?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); y'3rNa]G1  
 if(unhooked==TRUE){ /4yo`  
  nHookCount=0; sU=H&D99  
  hHook=NULL; D(~U6SR  
 } %Tfbsyf%f  
 return unhooked; ]=\].% >  
} H%[eV8  
P9R9(quI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  0HZ{Y9]  
{ !Lu2  
 BOOL bAdded=FALSE; ]}V<*f  
 for(int index=0;index<MAX_KEY;index++){ Pd8![Z3  
  if(hCallWnd[index]==0){ B`EJb71^Xy  
   hCallWnd[index]=hWnd; x[cL Bc<  
   HotKey[index]=cKey; ]a>n:p]e  
   HotKeyMask[index]=cMask; )~X2 &^orW  
   bAdded=TRUE; YX!iL6?~  
   KeyCount++; N"Z{5A  
   break; G?yLo 'Ulo  
  } %U/(|wodd  
 } %[GsD9_-  
 return bAdded; ez7A4>/  
} 2_>N/Z4T  
{4l8}w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _?nL+\'V  
{ ${DUCud,kY  
 BOOL bRemoved=FALSE; \P[Y`LYL  
 for(int index=0;index<MAX_KEY;index++){ VMZMG$C  
  if(hCallWnd[index]==hWnd){ sWhZby7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QL(n} {.%  
    hCallWnd[index]=NULL; Lw1Yvtn  
    HotKey[index]=0; 82+r^t/.  
    HotKeyMask[index]=0; !M(xG%M-V  
    bRemoved=TRUE; 8C40%q..  
    KeyCount--; hWjc<9  
    break;  -uS!\  
   } &bS ,hbDt  
  } <|HV. O/!  
 } h0EEpL|\  
 return bRemoved; j/DzCcp7  
} )+#` CIv  
]U+ LJOb  
void VerifyWindow() juJklSD  
{ {FI&^39 F$  
 for(int i=0;i<MAX_KEY;i++){ hDDn,uzpd  
  if(hCallWnd!=NULL){ dRYqr}!%n  
   if(!IsWindow(hCallWnd)){ Zpt\p7WQ  
    hCallWnd=NULL; *VCXihgo  
    HotKey=0; $t+,Tav  
    HotKeyMask=0; hW<%R]^|  
    KeyCount--; |]bsCmD  
   } /PVk{3  
  } i$Ul(?  
 } cZ,b?I"Q%  
} Xg6Jh``  
9X6h  
BOOL CHookApp::InitInstance() Ov@gh kr  
{ }CSDV9).S  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  1~gnc|?  
 hins=AfxGetInstanceHandle(); hE{K=Tz$  
 InitHotkey();  m!!/Za  
 return CWinApp::InitInstance(); X0HZH?V+  
} g&L!1<, p  
70d1ReQ  
int CHookApp::ExitInstance() [g |_~h  
{ : $1?i)  
 VerifyWindow(); 8S TvCH"Z_  
 UnInit(); M/f<A$xx_  
 return CWinApp::ExitInstance(); #~]zhHI  
} 'ms-*c&  
}rUN_.n4z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |"}FXa O  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) As&Sq-NWf  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ZvM(Q=^  
#if _MSC_VER > 1000 <_L,t 1H{  
#pragma once qz_7%c]K[  
#endif // _MSC_VER > 1000 LBeF&sb6  
kt#fMd$  
class CCaptureDlg : public CDialog u[;\y|75  
{ NWESP U):w  
 // Construction 0D.Mke )  
 public: >Er|Jxy  
  BOOL bTray; c^xIm'eob  
  BOOL bRegistered; I9A~Ye 5O&  
  BOOL RegisterHotkey(); P8:dU(nlW  
  UCHAR cKey; $S6`}3  
  UCHAR cMask; s[>,X#7 y  
  void DeleteIcon(); XT%nbh&y  
  void AddIcon(); n&4N[Qlv,  
  UINT nCount; CZwXTHe  
  void SaveBmp(); XX TL..  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor K!%+0)A  
  // Dialog Data #lo6c;*m5  
  //{{AFX_DATA(CCaptureDlg) KfEx"94  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y1\}5k{>  
  CComboBox m_Key; `,(4]tlL  
  BOOL m_bControl; B:Oa}/H   
  BOOL m_bAlt; #P9~}JB3,  
  BOOL m_bShift; )u&|_&g{}J  
  CString m_Path; L<cx:Vz  
  CString m_Number; k9R4Y\8P  
  //}}AFX_DATA h+H%?:FX  
  // ClassWizard generated virtual function overrides J1U/.`Oy  
  //{{AFX_VIRTUAL(CCaptureDlg) !?jrf] A@  
 public: M] %?>G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); KK4`l}Fk:n  
 protected: O`kl\K*R7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3*XNV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }"H,h)T  
  //}}AFX_VIRTUAL R%WCH?B<}  
  // Implementation yxQ1`'[CR  
 protected: hh%-(HaLX3  
  HICON m_hIcon; B"w?;EeV.  
  // Generated message map functions a5^] 20Fa  
  //{{AFX_MSG(CCaptureDlg) sE<V5`Z=  
  virtual BOOL OnInitDialog(); 7aRi5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !*&V- 4  
  afx_msg void OnPaint(); Pj^{|U21  
  afx_msg HCURSOR OnQueryDragIcon(); 05#1w#i  
  virtual void OnCancel(); Y]_ruDIW  
  afx_msg void OnAbout(); F,F4nw<W  
  afx_msg void OnBrowse(); 2,oKVm+  
  afx_msg void OnChange(); ?=7 cF  
 //}}AFX_MSG 2zA4vZkbcw  
 DECLARE_MESSAGE_MAP() s c,Hq\$&  
}; fw~Bza\e  
#endif (,\+tr8r8  
`?rSlR@+[I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U}[d_f  
#include "stdafx.h" bH9kj/q\b  
#include "Capture.h" |s(FLF-  
#include "CaptureDlg.h" uAq~=)F>,  
#include <windowsx.h> {]!mrAjD  
#pragma comment(lib,"hook.lib") i# /Jr=  
#ifdef _DEBUG {lDd.Fn  
#define new DEBUG_NEW 2]jn '4  
#undef THIS_FILE Sv#XIMw{,  
static char THIS_FILE[] = __FILE__; XEp{VC@=  
#endif n)-$e4u2  
#define IDM_SHELL WM_USER+1 Zn+.;o)E<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %XDc,AR[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HZB>{O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xrz,\eTb  
class CAboutDlg : public CDialog Sq V},  
{ TER=*"!  
 public: /9*B)m"  
  CAboutDlg(); $9#H04.x  
  // Dialog Data n ATuD  
  //{{AFX_DATA(CAboutDlg) z, )6"/;  
  enum { IDD = IDD_ABOUTBOX }; 7kLz[N6Ll  
  //}}AFX_DATA 6vo;!V6  
  // ClassWizard generated virtual function overrides }OR@~V{Gj  
  //{{AFX_VIRTUAL(CAboutDlg) %nZo4hnr$r  
 protected: 6I4\q.^qw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]@c+]{  
  //}}AFX_VIRTUAL A RuA<vQ  
  // Implementation Y_IF;V\  
 protected: sqwGsO$#  
  //{{AFX_MSG(CAboutDlg) jXx<`I+]  
  //}}AFX_MSG Yui3+}Ms  
  DECLARE_MESSAGE_MAP() F#Ryu~,"  
}; 3{64 @s  
#4% ]o%.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) O, wJR  
{ K(rWNO  
 //{{AFX_DATA_INIT(CAboutDlg) [wOn|)& &  
 //}}AFX_DATA_INIT n1t*sk/J  
} = `F(B  
IB"w&sBy  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #e1>H1eU  
{ z&)A,ryW0  
 CDialog::DoDataExchange(pDX); (!aNq(   
 //{{AFX_DATA_MAP(CAboutDlg) T^t# c  
 //}}AFX_DATA_MAP drP=A~?&:  
} %QGC8Tz  
KnQ*vM*VM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Jy:Qlx`  
 //{{AFX_MSG_MAP(CAboutDlg) gQg"j)  
 // No message handlers py!|\00}  
 //}}AFX_MSG_MAP &MQmu,4  
END_MESSAGE_MAP() )h4 f\0  
)gIKH{JYL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0B/,/KX  
: CDialog(CCaptureDlg::IDD, pParent) Su7?;Oh/yI  
{ $\BE&4g  
 //{{AFX_DATA_INIT(CCaptureDlg) y/{fX(aV  
  m_bControl = FALSE; Y@vTaE^w3  
  m_bAlt = FALSE; W=><)miQ@  
  m_bShift = FALSE; C*_C;6.~Y  
  m_Path = _T("c:\\"); 5E;qM|Ns  
  m_Number = _T("0 picture captured."); .CABH,Po:  
  nCount=0; VcO0sa f`  
  bRegistered=FALSE; 61>.vT8P  
  bTray=FALSE; )e+>w=t  
 //}}AFX_DATA_INIT ^z IW+:  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F=e8IUr  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2!m/  
} xp)sBM7A  
?m}s4a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  :D6 ON"6  
{ m)t;9J5  
 CDialog::DoDataExchange(pDX); 2j88<Yh]H  
 //{{AFX_DATA_MAP(CCaptureDlg) rk2j#>l$4  
  DDX_Control(pDX, IDC_KEY, m_Key); Fn;SF4KOm  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q4:o#K#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,+DG2u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8,4"uuI  
  DDX_Text(pDX, IDC_PATH, m_Path); { ]{/t-=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /<=u\e'rE  
 //}}AFX_DATA_MAP QL&ZjSN  
} 4{U T!WIi  
v5#j Z$<F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) uM IIYS  
//{{AFX_MSG_MAP(CCaptureDlg) wedbx00o  
 ON_WM_SYSCOMMAND() wr/"yQA]  
 ON_WM_PAINT() qZtzO2Mt  
 ON_WM_QUERYDRAGICON() EzM ?Nft  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  4iazNl#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !Vn\u  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ghG**3xr  
//}}AFX_MSG_MAP {j?FNOJn  
END_MESSAGE_MAP() *SDs;kg  
N1}sHyVq7  
BOOL CCaptureDlg::OnInitDialog() u<tbbKM  
{ yy^q2P  
 CDialog::OnInitDialog(); '4+ ur`  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -hGk?_Nqa/  
 ASSERT(IDM_ABOUTBOX < 0xF000); 6 l|DU7i  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9k '7832u  
 if (pSysMenu != NULL) 30#s aGV  
 { /tx]5`#@7]  
  CString strAboutMenu; ;~ )5s'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); y| i,|  
  if (!strAboutMenu.IsEmpty()) %+W{iu[|  
  { |^"1{7)  
   pSysMenu->AppendMenu(MF_SEPARATOR); )Xz,j9GzJS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); JxdDC^> 0  
  } eCU:Q  
 } "Y =;.:qe  
 SetIcon(m_hIcon, TRUE); // Set big icon .PIL +x*]N  
 SetIcon(m_hIcon, FALSE); // Set small icon BDW^7[n  
 m_Key.SetCurSel(0); X8a/ `Y,  
 RegisterHotkey(); s^G.]%iU  
 CMenu* pMenu=GetSystemMenu(FALSE); A@!qv#'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); r[`9uVT/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -8ywO"6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oi&VgnSk  
 return TRUE; // return TRUE unless you set the focus to a control HSE!x_$  
} +ZaSM~   
B dj!ia;H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) RNEp4x  
{ T= y}y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,GbR!j@6  
 { ,F8Yn5h  
  CAboutDlg dlgAbout; gZ3u=uME  
  dlgAbout.DoModal(); Xv5wJlc!d  
 } Ct<udO  
 else _/s$ZCd  
 { ^B.5GK)!  
  CDialog::OnSysCommand(nID, lParam); p?%y82E  
 } c \J:![x  
} Y1W1=Uc uk  
qdJ=lhHM}  
void CCaptureDlg::OnPaint() ?4#Li~q  
{ F4-$~ v@  
 if (IsIconic()) K*vt;L  
 { In"ZIKaC  
  CPaintDC dc(this); // device context for painting @su^0 9n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |/|5UiX7  
  // Center icon in client rectangle b5dD/-Vj  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7 UKh688  
  int cyIcon = GetSystemMetrics(SM_CYICON); KI iO  
  CRect rect; 6EoMt@7g  
  GetClientRect(&rect); O-0x8O^B  
  int x = (rect.Width() - cxIcon + 1) / 2; zlSNfgO  
  int y = (rect.Height() - cyIcon + 1) / 2; ;C9_?u~#  
  // Draw the icon m/@wh a  
  dc.DrawIcon(x, y, m_hIcon); k<nZ+! M  
 } ,GhS[VJjR  
 else ,hm\   
 { X6w6%fzOH>  
  CDialog::OnPaint(); `iFmrC<  
 } <y('hI'  
} Wq D4YGN  
2G & a{  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9rA0lqr]5  
{ "+R+6<"  
 return (HCURSOR) m_hIcon; PfAgM1   
} 7FP*oN?  
$D~0~gn~  
void CCaptureDlg::OnCancel() jE.N ev/  
{ W s3)gvpPA  
 if(bTray) 1Z/(G1  
  DeleteIcon(); 13$%,q)  
  CDialog::OnCancel(); u OmtyX  
} R3)~?X1n  
gS!:+G%  
void CCaptureDlg::OnAbout() t9GR69v:?  
{ z3{G9Np  
 CAboutDlg dlg; \"w"$9o6  
 dlg.DoModal(); T$)^gHS  
} xjUT{iwS  
|#v7/$!  
void CCaptureDlg::OnBrowse() u"r`3P`  
{ D# 9m\o_  
 CString str; ?um;s-x)  
 BROWSEINFO bi; wy<S;   
 char name[MAX_PATH]; dK$XNi13.5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &)# ihK_  
 bi.hwndOwner=GetSafeHwnd(); niMsQ  
 bi.pszDisplayName=name; /e5O"@  
 bi.lpszTitle="Select folder"; :[.vM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; IEL%!RFG  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6fE7W>la  
 if(idl==NULL) [t m_Mg  
  return; b i',j0B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :;%2BSgFU  
 str.ReleaseBuffer(); K C*e/J  
 m_Path=str; 1W c=5!  
 if(str.GetAt(str.GetLength()-1)!='\\') <VMGTBVQ  
  m_Path+="\\"; a Yg6H2Un  
 UpdateData(FALSE); =g7x' kN  
} ;Zcswt8]u  
gs^Xf;g vI  
void CCaptureDlg::SaveBmp() *?@?f&E/  
{ ]\-A;}\e  
 CDC dc; ch*8B(:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (U D nsF  
 CBitmap bm; o*+"|  
 int Width=GetSystemMetrics(SM_CXSCREEN); d~])K#oJ  
 int Height=GetSystemMetrics(SM_CYSCREEN); h"B+hu  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6%\J"AgXO  
 CDC tdc; `P@<3]  
 tdc.CreateCompatibleDC(&dc); Y,qI@n<  
 CBitmap*pOld=tdc.SelectObject(&bm); hk;5w{t}}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h ]5(].  
 tdc.SelectObject(pOld); Q^P}\wb>  
 BITMAP btm; 9 &dtd  
 bm.GetBitmap(&btm); S3C]AhW;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )rIwqUgp6\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); j.[.1G*("  
 BITMAPINFOHEADER bih; zF`0J  
 bih.biBitCount=btm.bmBitsPixel; d(ZO6Nr Q  
 bih.biClrImportant=0; ^`i#$  
 bih.biClrUsed=0; ^x]r`b  
 bih.biCompression=0; :I]Mps<  
 bih.biHeight=btm.bmHeight; B9_ X;c  
 bih.biPlanes=1; !NK1MU?T)  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~Py`P'+  
 bih.biSizeImage=size; ;DQ ZT  
 bih.biWidth=btm.bmWidth; g\|PcoLm  
 bih.biXPelsPerMeter=0; R3f89  
 bih.biYPelsPerMeter=0; Uk[b|<U-`d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "m):Y;9iQ?  
 static int filecount=0; ZuzEg*lb  
 CString name; Y sC>i`n9  
 name.Format("pict%04d.bmp",filecount++); ,C\i^>=  
 name=m_Path+name; (!u~CZ;  
 BITMAPFILEHEADER bfh; ^cC,.Fdw  
 bfh.bfReserved1=bfh.bfReserved2=0; ?6!JCQJ<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dZl5Ic  
 bfh.bfSize=54+size; )N{Pw$l_  
 bfh.bfOffBits=54; G{~J|{t\yz  
 CFile bf; (Bb5?fw  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ EmWn%eMN  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); AG nxYV"p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f3l&3hC  
  bf.WriteHuge(lpData,size); P7bMIe  
  bf.Close(); Bpo4?nCl}  
  nCount++; 5:[0z5Hww  
 } [C 7^r3w  
 GlobalFreePtr(lpData); e-/&$Qq  
 if(nCount==1) ZL&qp04}  
  m_Number.Format("%d picture captured.",nCount); y-pJF{ R  
 else n: ^ d|@  
  m_Number.Format("%d pictures captured.",nCount); $?iLLA~  
  UpdateData(FALSE); gT{Q#C2Baw  
} x M/+L:_<  
Ys9[5@7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T9|m7  
{ 79rD7D&g  
 if(pMsg -> message == WM_KEYDOWN) .^33MWu6  
 { aH(J,XY  
  if(pMsg -> wParam == VK_ESCAPE) ,Q$ q=E;X  
   return TRUE; ah$b [\#C  
  if(pMsg -> wParam == VK_RETURN) un"Gozmt5  
   return TRUE; & bm 1Fz  
 } bTNgjc  
 return CDialog::PreTranslateMessage(pMsg); (62"8iD6  
} w>&aEv/f  
q s!j>x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dh\'<|\K  
{ Xh"n]TK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =+-UJo5  
  SaveBmp(); oAVnK[EMq`  
  return FALSE; wc@X.Q[  
} e`_LEv  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;W )Y OT  
 CMenu pop; np^N8$i:n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :as$4|  
 CMenu*pMenu=pop.GetSubMenu(0); .WJ YQi  
 pMenu->SetDefaultItem(ID_EXITICON); kPG-hD  
 CPoint pt; `:fZ)$sY  
 GetCursorPos(&pt); ] )\Pqn(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \~mT] '5  
 if(id==ID_EXITICON) LKB$,pR~1l  
  DeleteIcon(); \;,+   
 else if(id==ID_EXIT) cGzPI +F  
  OnCancel(); OX0%C.K)hZ  
 return FALSE; i v38p%Zm  
} :uS\3toj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =U9*'EFr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q'F+OQb1  
 AddIcon(); 3AtGy'NTp  
 return res; r.&Vw|*>  
} ?pmHFlx  
a$OE0zn`  
void CCaptureDlg::AddIcon() X=&ET)8-Y  
{ e2TiBTbQaF  
 NOTIFYICONDATA data; 9d659i C  
 data.cbSize=sizeof(NOTIFYICONDATA); ^98~U\ar  
 CString tip; !sP {gi#=  
 tip.LoadString(IDS_ICONTIP); f|c{5$N!  
 data.hIcon=GetIcon(0); k@J&IJ  
 data.hWnd=GetSafeHwnd(); 20h, ^  
 strcpy(data.szTip,tip); '3fu  
 data.uCallbackMessage=IDM_SHELL; s?}e^/"v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H[$"+&q  
 data.uID=98; ;7V%#-  
 Shell_NotifyIcon(NIM_ADD,&data); L|7R9+ZG  
 ShowWindow(SW_HIDE); ]y '>=a|T  
 bTray=TRUE; ^A/k)x6  
} '@KEi%-^>  
#&aqKV Y  
void CCaptureDlg::DeleteIcon() 3z?> j]  
{ Do7Tj  
 NOTIFYICONDATA data; L|xbR#v  
 data.cbSize=sizeof(NOTIFYICONDATA); 0RLg:SV  
 data.hWnd=GetSafeHwnd(); {rw|#Z>A  
 data.uID=98; ;bib/  
 Shell_NotifyIcon(NIM_DELETE,&data); 8qTys8  
 ShowWindow(SW_SHOW); ^"2J]&x`G  
 SetForegroundWindow(); Om\vMd@!  
 ShowWindow(SW_SHOWNORMAL); xJ8M6O8  
 bTray=FALSE; *vxk@ `K~  
} =s2*H8]  
osAd1<EIC  
void CCaptureDlg::OnChange() f}f9@>.  
{ >*_$]E  
 RegisterHotkey(); ,m:.-iy?  
} WPMSm<[  
3yF,ak {Sl  
BOOL CCaptureDlg::RegisterHotkey() i%]EEVmN  
{ ,T$U'&;  
 UpdateData(); +gtbcF@rx  
 UCHAR mask=0; 'Aq{UGN  
 UCHAR key=0; ,/F~ Y&1I  
 if(m_bControl) '9J/T57]e  
  mask|=4; ]Ie 0S~  
 if(m_bAlt) J @1!Oq>  
  mask|=2; )~JHgl  
 if(m_bShift) }rw8PZ9  
  mask|=1; E KLyma&}Y  
  key=Key_Table[m_Key.GetCurSel()]; ]MitOkX  
 if(bRegistered){ kfY}S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); DU/]  
  bRegistered=FALSE; )_S(UVI5  
 } Hk.TM2{w  
 cMask=mask; ;))+>%SGCt  
 cKey=key; c9u`!'g`i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K!Y71_#  
 return bRegistered; Yu^4VXp~M%  
} Vaw+.sG`AP  
m nX2a  
  四、小结 :KP @RZm  
giw &&l=_  
  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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