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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: aksyr$d0V<  
  sTdD=>  
  一、实现方法 o:_}=1nh  
l2>G +t(,  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ^8aj\xe(  
u&`7 C  
#pragma data_seg("shareddata") Mjq1qEi"B  
HHOOK hHook =NULL; //钩子句柄 7f#[+i  
UINT nHookCount =0; //挂接的程序数目 0\%/:2   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6}  !n0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 aT[Z#Zd, N  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =?T\zLN=  
static int KeyCount =0; ?"PUw3V3lB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `@ULG>   
#pragma data_seg() "aK3 ylz;  
?hvPPEJf  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 j$^3  
K+xiov-r?  
  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: * 7.!"rb8A  
Gvv~P3Dm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (E59)z -  
cKey,UCHAR cMask) 3N(s)N_P M  
{ = ^:TW%O  
 BOOL bAdded=FALSE; [=9-AG~}  
 for(int index=0;index<MAX_KEY;index++){ M *BDrM  
  if(hCallWnd[index]==0){ 7+JQaYO`"  
   hCallWnd[index]=hWnd; 4&)*PKq  
   HotKey[index]=cKey; KgX~PP>  
   HotKeyMask[index]=cMask; *}Zd QJL  
   bAdded=TRUE; O^|dc=  
   KeyCount++; `w6\II)aB  
   break; ,xB&{ J  
  } d7qY(!&  
 } ,K .P,z~*  
 return bAdded; Ojq>4=Z\  
} uQWJ7Xm  
//删除热键 R_\{a*lV0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vb)Z&V6(  
{ ;rJR+wpNa  
 BOOL bRemoved=FALSE; EP&iG%(k  
 for(int index=0;index<MAX_KEY;index++){ )6iY9[@tN  
  if(hCallWnd[index]==hWnd){ gxpR#/(E~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ jZS6f*$  
    hCallWnd[index]=NULL; K>6#MI  
    HotKey[index]=0; {&8-OoH ~  
    HotKeyMask[index]=0; _KC)f'Cx  
    bRemoved=TRUE; Oga0CR_  
    KeyCount--; jI(~\`  
    break; r9 'lFj  
   } < i"U%Ds(  
  } P0S ;aE  
 } UvRa7[<y%%  
 return bRemoved; mf6?8!O}>  
} aB"W6[  
/8@JWK^I{  
MBRRzq%F  
  DLL中的钩子函数如下: a \B<(R.  
e~=fo#*2?@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) id@!kSR  
{ 0e9W>J9  
 BOOL bProcessed=FALSE; 1w'iD X  
 if(HC_ACTION==nCode) 16)@<7b]J  
 { |_8 ::kir:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zg2A$Fd[j  
   switch(wParam) Oyhl*`-*t  
   {  xi8RE@gm  
    case VK_MENU: E{sTxO I$  
     MaskBits&=~ALTBIT; `%p}.X  
     break; _H>ABo  
    case VK_CONTROL: L B1 ui  
     MaskBits&=~CTRLBIT; kM|akG  
     break; KB <n-'  
    case VK_SHIFT: HS.3PE0^C  
     MaskBits&=~SHIFTBIT; LF* 7;a  
     break; rc1EJ(c  
    default: //judge the key and send message Um]>B`."wK  
     break; ~ z*  
   } ]78I  
   for(int index=0;index<MAX_KEY;index++){ *5]fjh{  
    if(hCallWnd[index]==NULL) g #u1.|s&p  
     continue; ZN-J!e"`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +"6_rbeuO  
    { V;mKJ.d${  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;({&C34a  
     bProcessed=TRUE; D{I^_~-\5  
    } lidzs<W-fW  
   } K2>(C$Z  
  } 1BwCJ7?8  
  else if((lParam&0xc000ffff)==1){ //有键按下 z"bgtlfb8  
   switch(wParam) ,Y=r] fk  
   { 2-j+-B|i  
    case VK_MENU: ,.uu/qV}w  
     MaskBits|=ALTBIT; RzQ1Wq  
     break; T5.1qrL  
    case VK_CONTROL: GJai!$v  
     MaskBits|=CTRLBIT; PF*<_p"j  
     break; Q]Q i  
    case VK_SHIFT: Yv }G"-=  
     MaskBits|=SHIFTBIT; Brr{iBz*"  
     break; y_M<\b  
    default: //judge the key and send message ]24aK_Uu  
     break; zM"OateA  
   } U(]a(k<r  
   for(int index=0;index<MAX_KEY;index++){ "pdmz+k8S  
    if(hCallWnd[index]==NULL) I0P)DR  
     continue; "{105&c\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Tq `c  
    { >Jt,TMMlt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6|wi Zw  
     bProcessed=TRUE; /1ooOq]  
    } z8{ kwz  
   } trnjOm  
  } &Z/aM?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !}|n3wQ  
   for(int index=0;index<MAX_KEY;index++){ xCF k1%qf  
    if(hCallWnd[index]==NULL) <KqZ.7XfB  
     continue; %&5 !vK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $UavM|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z:-a7_   
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _O2},9L n  
   } vt<r_&+ pJ  
  } W,5A|Q~  
 } U(3+*'8r,1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5:/ zbt\C  
} 3Ba>a(E  
v+f:VA  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: m5Q,RwJ!xK  
&$tBD@7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `}#(Ze*V:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =Ig'Aw$x  
^5j|   
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: mv|eEz)r  
W!8g.r4u+,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V$%%nG uE  
{ }GJIM|7^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N ncur]  
 { $'*@g1v Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 i<&*f}='  
  SaveBmp(); iM+K&\{_h  
  return FALSE; fu'iG7U M  
 } A9\m .3jo  
 …… //其它处理及默认处理 Y,?s-AB  
} ,S E5W2a]  
]\w0u7}  
z OD5a=[1  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 X> :@`}bq  
p0~=   
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 |>@Gbgw^M  
CwZ+P n0  
  二、编程步骤 2%U)y;$m2  
/fbI4&SB!  
  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"; $7eO33Bm  
azR<Y_tw  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u[9i>7}9  
md:$O C3  
  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; Y~EKMowI&e  
{i y[8eLg  
  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; 3 XdN \xc  
{ 2G9>'  
  5、 添加代码,编译运行程序。 Yh)yp?  
l?v`kAMR  
三、程序代码 &cztUM(  
uSCF;y=1g,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <-62m8N|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A]" $O&l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U<{8nMB  
#if _MSC_VER > 1000 ?nJ7lLQA  
#pragma once ln%xp)t  
#endif // _MSC_VER > 1000 J/S 47J~  
#ifndef __AFXWIN_H__ _Qg^>}]A1  
#error include 'stdafx.h' before including this file for PCH </F@ 5*  
#endif :W(3<D7\  
#include "resource.h" // main symbols /Y@^B,6 \  
class CHookApp : public CWinApp yep`~``_  
{ bg;N BoZd  
 public: FJKW=1 =,  
  CHookApp(); g3Q]W(F%$  
  // Overrides 2:'C|  
  // ClassWizard generated virtual function overrides //cj$}Rn!  
  //{{AFX_VIRTUAL(CHookApp) =xcA4"k  
 public: "@U9'rKx  
  virtual BOOL InitInstance(); c=]qUhnH  
  virtual int ExitInstance(); w6DK&@w`'/  
  //}}AFX_VIRTUAL Ry>c]\a]  
  //{{AFX_MSG(CHookApp) @r4ZN6Wn  
  // NOTE - the ClassWizard will add and remove member functions here. z2Sp  
  // DO NOT EDIT what you see in these blocks of generated code ! d!kiWmw,  
  //}}AFX_MSG 6, \i0y5n  
  DECLARE_MESSAGE_MAP() q(<#7 spz  
}; <ABN/nH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); RB<LZHZI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); | n5F_RL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )w];eF0c  
BOOL InitHotkey(); ''Fy]CwH(  
BOOL UnInit(); H|_^T.n?E  
#endif N|hNh$J[  
H?98^y7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Xr\|U89P  
#include "stdafx.h" ;@p2s'(  
#include "hook.h" OrP-+eg  
#include <windowsx.h> G0Zq:kJ  
#ifdef _DEBUG #k2&2W=x  
#define new DEBUG_NEW a$ a+3}\  
#undef THIS_FILE )R$+dPu>  
static char THIS_FILE[] = __FILE__; 7uG@ hL36  
#endif ` W$  
#define MAX_KEY 100 $O"S*)9  
#define CTRLBIT 0x04 ModwJ w  
#define ALTBIT 0x02 c#sPM!!  
#define SHIFTBIT 0x01 {wMw$Fvf  
#pragma data_seg("shareddata") y;A<R[|Ve  
HHOOK hHook =NULL; WmU4~.  
UINT nHookCount =0; (+7gS_c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wP28IB:^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT eUlF4l<]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w"d~R   
static int KeyCount =0; YBn"9w\#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3Tze`Q 9  
#pragma data_seg() y~'F9E!i  
HINSTANCE hins; , f9V`Pz)  
void VerifyWindow(); wy6>^_z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3qOq:ZkQ  
//{{AFX_MSG_MAP(CHookApp) (7BG~T  
// NOTE - the ClassWizard will add and remove mapping macros here. Poy ]5:.  
// DO NOT EDIT what you see in these blocks of generated code! fP>_P# gZ  
//}}AFX_MSG_MAP 0VC8'6S_k  
END_MESSAGE_MAP() .,zrr&Po  
=H6"\`W  
CHookApp::CHookApp() vaL+@Kq~&  
{ %7=B?c |  
 // TODO: add construction code here, ,73 kh  
 // Place all significant initialization in InitInstance *(6vO{  
} wY|&qX,  
H_)\:gTG  
CHookApp theApp; m[ *)sm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DQO~<E6c  
{ )W9W8>Cc5_  
 BOOL bProcessed=FALSE; ~_ss[\N  
 if(HC_ACTION==nCode) USfpCRj9  
 { MMg"G6?  
  if((lParam&0xc0000000)==0xc0000000){// Key up %UZ_wsY\  
   switch(wParam) `|K30hRp:  
   { 9bvzt8pc  
    case VK_MENU: #<d f!)  
     MaskBits&=~ALTBIT; 1gk{|keh  
     break; K6<@DP+/  
    case VK_CONTROL: kKr|PFz  
     MaskBits&=~CTRLBIT; I>ks H  
     break; X`bN/sI  
    case VK_SHIFT: ^@?-YWt   
     MaskBits&=~SHIFTBIT; n'R9SnW  
     break; $"&0  
    default: //judge the key and send message am,UUJ+h>  
     break; 'o=`1I  
   } rT$J0"*=  
   for(int index=0;index<MAX_KEY;index++){ 5BKga1Q  
    if(hCallWnd[index]==NULL) OB"Ur-hJ0  
     continue; -JOtvJIQI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l/9V59Fv9  
    { *olV Y/'O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |uo<<-\jTO  
     bProcessed=TRUE; )]x/MC:9r  
    } y ,][  
   } sYnf #'  
  } XnC`JO+7M  
  else if((lParam&0xc000ffff)==1){ //Key down cU <T;1VQ  
   switch(wParam) 0'u2xe  
   { d|5V"U]W;  
    case VK_MENU: j8WMGSrrF  
     MaskBits|=ALTBIT; 9sYN7x  
     break; `s HrC  
    case VK_CONTROL: $1<V'b[E  
     MaskBits|=CTRLBIT; +Hx$ABH  
     break; )>,; GVu"  
    case VK_SHIFT: .ko8`J%%M  
     MaskBits|=SHIFTBIT; 1_JtD|Jy  
     break; {2wfv2hQ  
    default: //judge the key and send message ^q``f%Xt  
     break; 7A0D[?^xe  
   } m(Ghe2T:  
   for(int index=0;index<MAX_KEY;index++) dIk/vg  
   { ;Zfglid  
    if(hCallWnd[index]==NULL) 4+&4  
     continue; bxX[$q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &w\E*$  
    { mqL&bmT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iW.4'9   
     bProcessed=TRUE; 5Y<O  
    } ]BAM _  
   } 8W' ,T  
  } g+>$_s  
  if(!bProcessed){ ]pUf[^4  
   for(int index=0;index<MAX_KEY;index++){ ,>(/}=Z.  
    if(hCallWnd[index]==NULL) %qG nvQ  
     continue; ')C %CAYW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^6&?R?y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -*q:B[d  
   } \hGo D  
  } Q}ebw  
 } G#{ Xd6L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ",wv*z)_>  
} C1=7.dPr  
^R\et.W`s  
BOOL InitHotkey() vLQ!kB^\W  
{ bvyX(^I[q  
 if(hHook!=NULL){ b[+G+V   
  nHookCount++; VQSwRL3B=  
  return TRUE; [I/f(GK  
 } uJ:'<dJ  
 else @C[]o.r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OcR6\t'  
  if(hHook!=NULL) H/!_D f  
   nHookCount++; $`7cs}#  
  return (hHook!=NULL); N}`.N  
} j ys1Ki  
BOOL UnInit() s$g"6;_\  
{ o$dnp`E  
 if(nHookCount>1){ Y{c_5YYf  
  nHookCount--; zY?GO"U"  
  return TRUE; W)WL1@!Z  
 } cEkf9:_La  
 BOOL unhooked = UnhookWindowsHookEx(hHook); qs\ O(K8  
 if(unhooked==TRUE){ EW;R^?Z  
  nHookCount=0; FPM@%U  
  hHook=NULL; 6Y!hz7D  
 } S3cjw9V  
 return unhooked; *}BaO*A  
} MUo}Qi0K  
i3C5"\y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "Mt4~vy  
{ K$>C*?R  
 BOOL bAdded=FALSE; H.\gLIr  
 for(int index=0;index<MAX_KEY;index++){ 3yNILj  
  if(hCallWnd[index]==0){ #$!(8>YJ  
   hCallWnd[index]=hWnd; _Wcr'*7  
   HotKey[index]=cKey; UhQsT^b_  
   HotKeyMask[index]=cMask; {(mT,}`4  
   bAdded=TRUE; B>kx$_~  
   KeyCount++; HsA4NRF'7  
   break; 4F_*,_Y  
  } /I[?TsXp  
 } h-0sDt pR  
 return bAdded; 'FB?#C%U  
} 6=V&3|"  
T /iKz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jJ^p ?  
{ VCOz?Y*  
 BOOL bRemoved=FALSE; y*ae 5=6(  
 for(int index=0;index<MAX_KEY;index++){ LKtug>Me  
  if(hCallWnd[index]==hWnd){ ~jK'n4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u,<#z0R|;$  
    hCallWnd[index]=NULL; ')pXQ  
    HotKey[index]=0; unE h  
    HotKeyMask[index]=0; i:ar{ q  
    bRemoved=TRUE; :W'Yt9v)  
    KeyCount--; J23Tst#s  
    break; >;@ _TAF  
   } sGx"j a +  
  } xyGk\= S  
 } 6nxX~k  
 return bRemoved; F,2)Udim  
} VgfA&?4[  
5GD6%{\O  
void VerifyWindow() w2B If[~t  
{ d-%!.,F#W  
 for(int i=0;i<MAX_KEY;i++){ " 9=F/o9  
  if(hCallWnd!=NULL){ !Pnvqgp/  
   if(!IsWindow(hCallWnd)){ $[zy|Y(  
    hCallWnd=NULL; HWe?vz$4"  
    HotKey=0; !acm@"Ea  
    HotKeyMask=0; BR1oE3in  
    KeyCount--; l{U-$}  
   } 9b`J2_ ]k  
  } W5a)`%H  
 } xf1@mi[a  
} rUC@Bf  
FI @!7@  
BOOL CHookApp::InitInstance() @^47Qgj8 U  
{ v-`RX;8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @ eQIwz  
 hins=AfxGetInstanceHandle(); Kk?P89=*  
 InitHotkey(); ia.95H;  
 return CWinApp::InitInstance(); 63b?-.!b  
} r)$(>/[$  
U 00}jH  
int CHookApp::ExitInstance() c"X`OB  
{ ^l\U6$3  
 VerifyWindow(); &WW|! 6  
 UnInit(); I;dc[m  
 return CWinApp::ExitInstance(); )bc0 t]Fs  
} 'gYUyl  
|2mm@):  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3OUZR5_$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xL,;(F\^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +bwSu)k  
#if _MSC_VER > 1000 ,DrE4")4  
#pragma once C(i1Vx<-  
#endif // _MSC_VER > 1000 O][R "5d  
83,ATQg  
class CCaptureDlg : public CDialog &Q7vY  
{ ?nOul}y/  
 // Construction --SlxV/x  
 public: n6T@A;_g  
  BOOL bTray; iU^KmM I  
  BOOL bRegistered; DgOO\  
  BOOL RegisterHotkey(); h+o-h4X  
  UCHAR cKey; s53 Pw>f  
  UCHAR cMask; h WvQh  
  void DeleteIcon(); >"qnuv G  
  void AddIcon(); R +H0+omj  
  UINT nCount; <uXZ*E  
  void SaveBmp(); cPcp@Dp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =n_r\z  
  // Dialog Data #Z8=z*4  
  //{{AFX_DATA(CCaptureDlg) o#V}l^uU=  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gni<@;}  
  CComboBox m_Key; #QdBI{2  
  BOOL m_bControl; D$|@: mW  
  BOOL m_bAlt; aiP.\`>}  
  BOOL m_bShift; <Wgp$qt;  
  CString m_Path; $5XE'm  
  CString m_Number; >3R)&N  
  //}}AFX_DATA , VT&  
  // ClassWizard generated virtual function overrides ml=tS,  
  //{{AFX_VIRTUAL(CCaptureDlg) -nP y?>p"|  
 public: AS[yNCsjC  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^O_E T$  
 protected: XV"8R"u%Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q/EHvb]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  Dh=?Hzw  
  //}}AFX_VIRTUAL @1_M's;  
  // Implementation ~Rx:X4|H  
 protected: s!* m^zx  
  HICON m_hIcon; |l)z^V!  
  // Generated message map functions o+e:H jZZ  
  //{{AFX_MSG(CCaptureDlg) };5d>#NK,Y  
  virtual BOOL OnInitDialog(); ?kfLOJQ:I  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QXTl'.SfF  
  afx_msg void OnPaint(); 8]U;2H/z  
  afx_msg HCURSOR OnQueryDragIcon(); GAK!qLy9  
  virtual void OnCancel(); nM*-Dy3ou  
  afx_msg void OnAbout();  egur}  
  afx_msg void OnBrowse(); _tJp@\rOz=  
  afx_msg void OnChange(); k WVaHZr  
 //}}AFX_MSG NRU&GCVwu  
 DECLARE_MESSAGE_MAP() |tl4I2AV  
}; cE3g7(a  
#endif Bf37/kkf(  
9os>k*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !]1'?8  
#include "stdafx.h" 9$)I=Rpk =  
#include "Capture.h" :\I88 -N@'  
#include "CaptureDlg.h" |G^w2"D_Z  
#include <windowsx.h> Ae,P&(  
#pragma comment(lib,"hook.lib") |KF_h^  
#ifdef _DEBUG =+{SZh@  
#define new DEBUG_NEW X6lkz*M.  
#undef THIS_FILE (* WO<V  
static char THIS_FILE[] = __FILE__; ~ ;CnwG   
#endif B(+J?0Dj  
#define IDM_SHELL WM_USER+1 I_|@Fn[>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #~(J J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); koQ\]t'*As  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6M({T2e  
class CAboutDlg : public CDialog x<_uwL2a  
{ 0q6$KP}q  
 public: |Tn+Aq7  
  CAboutDlg(); VKI`@rY4  
  // Dialog Data @w?y;W!a>  
  //{{AFX_DATA(CAboutDlg) _ISIq3A?  
  enum { IDD = IDD_ABOUTBOX }; wjLtLtK?  
  //}}AFX_DATA Tw^b!74gq  
  // ClassWizard generated virtual function overrides IGKF&s*;{[  
  //{{AFX_VIRTUAL(CAboutDlg) 8_yhV{  
 protected: 3i KBVN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v(5zSo  
  //}}AFX_VIRTUAL ^! ?wh  
  // Implementation ;[pY>VJ(  
 protected: $\:;N]Cs~0  
  //{{AFX_MSG(CAboutDlg) v?\Z4Z|f  
  //}}AFX_MSG NJ 6* 7Cd  
  DECLARE_MESSAGE_MAP() 6x?3%0Km  
}; *^|.bBG  
AmSrc.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^*!Tq&Dst|  
{ ;8!L*uMI  
 //{{AFX_DATA_INIT(CAboutDlg) A.`) 0dV  
 //}}AFX_DATA_INIT -u!{8S~wA  
} ZdcG6IG+  
"n,? )  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y2nwDw(xF  
{ Pe-1o#7~W  
 CDialog::DoDataExchange(pDX); >M~wFs$~  
 //{{AFX_DATA_MAP(CAboutDlg) QQ1|]/)  
 //}}AFX_DATA_MAP CF|4, K)  
} &x= PAu  
t|/{oAj  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =a!w)z_rw  
 //{{AFX_MSG_MAP(CAboutDlg) gK8E|f-z  
 // No message handlers S5a?KU  
 //}}AFX_MSG_MAP ?g7O([*[  
END_MESSAGE_MAP() E@uxEF  
iLd_{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2<"kfa n  
: CDialog(CCaptureDlg::IDD, pParent) J0%e6{C1  
{ #* KmPc+  
 //{{AFX_DATA_INIT(CCaptureDlg) 0+H4sz%.  
  m_bControl = FALSE; 1?!z<<  
  m_bAlt = FALSE; gHL v zm  
  m_bShift = FALSE; &\w:jI44Bs  
  m_Path = _T("c:\\"); Pl2ZA)[g  
  m_Number = _T("0 picture captured."); $G $147z  
  nCount=0; %yr(i 6L  
  bRegistered=FALSE; 3b9SyU2  
  bTray=FALSE; bUcq LV  
 //}}AFX_DATA_INIT (fSpY\JPI  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 NG)Xk[q4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y9/x:n&]  
}  9hbn<Y  
a,>`ab%>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -Y?C1DbKz  
{ },tN{()  
 CDialog::DoDataExchange(pDX); HutwgPvy  
 //{{AFX_DATA_MAP(CCaptureDlg) }VetaO2*  
  DDX_Control(pDX, IDC_KEY, m_Key); zG"*B_l}+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1-!q,q  
  DDX_Check(pDX, IDC_ALT, m_bAlt); p bRU"   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); |ORro r}  
  DDX_Text(pDX, IDC_PATH, m_Path); J ~"h&>T  
  DDX_Text(pDX, IDC_NUMBER, m_Number); oZ CvEVUk  
 //}}AFX_DATA_MAP q!r4"#Y"@Z  
} L("zS%qr  
8Qwn  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ()[j<KX{.  
//{{AFX_MSG_MAP(CCaptureDlg) :3oLGiL   
 ON_WM_SYSCOMMAND() f&ZFG>)6  
 ON_WM_PAINT() .+.BNS   
 ON_WM_QUERYDRAGICON() F4o)6+YM   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O|ODJOQNol  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E;*JD x  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4/_@F>I_  
//}}AFX_MSG_MAP 7QnQ=gu  
END_MESSAGE_MAP() h#EksX  
DrY5Q&S  
BOOL CCaptureDlg::OnInitDialog() ?H30  
{ 0q4E^}iR  
 CDialog::OnInitDialog(); n91@{U)QJ3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s]lIDp}  
 ASSERT(IDM_ABOUTBOX < 0xF000); q3SYlL'a  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x{|`q9V~ N  
 if (pSysMenu != NULL) !}+rg2  
 { ug?])nO.C  
  CString strAboutMenu; z[E gMS!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); . #7B10  
  if (!strAboutMenu.IsEmpty()) mW+QJ`3  
  { W)OoHpdw  
   pSysMenu->AppendMenu(MF_SEPARATOR); dI$U{;t  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H.H$5(?O  
  } IegZ)&_n  
 } JGZxNUr^  
 SetIcon(m_hIcon, TRUE); // Set big icon +DpiX&^h   
 SetIcon(m_hIcon, FALSE); // Set small icon 6`V2-zv$  
 m_Key.SetCurSel(0); li`4&<WGC  
 RegisterHotkey(); 3Mlwq'pzD  
 CMenu* pMenu=GetSystemMenu(FALSE); vwc)d{ND  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "i5Rh^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fc,^H&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); VK~ OL  
 return TRUE; // return TRUE unless you set the focus to a control "&@v[O)!xu  
} &OXnZT3P  
)9PP3"I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N.l\2S}  
{ 5VLJ:I?0O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u`j9m @`  
 { 8B|qNf `Yi  
  CAboutDlg dlgAbout; sy s6 V?  
  dlgAbout.DoModal(); O=A(x m#  
 } %XU V[L}  
 else b+6%Mu}o  
 { `H#G/zOr  
  CDialog::OnSysCommand(nID, lParam); ~8htg8CZ`  
 } (mvzGXNz4  
} Y*KHr`\C4  
3P&K<M#\  
void CCaptureDlg::OnPaint() 8'n xc#&  
{ Mu~DB:Y9e  
 if (IsIconic()) PrZs@ Y  
 { 5PCMxjon  
  CPaintDC dc(this); // device context for painting jcY:a0[{D  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YtWO=+rX  
  // Center icon in client rectangle \i}:Vb(^  
  int cxIcon = GetSystemMetrics(SM_CXICON); +hW^wqk/.  
  int cyIcon = GetSystemMetrics(SM_CYICON); |J_kS90=  
  CRect rect; p2\mPFxEP  
  GetClientRect(&rect); uPvE;E_  
  int x = (rect.Width() - cxIcon + 1) / 2; -$Ad#Eu]M  
  int y = (rect.Height() - cyIcon + 1) / 2; }ag -J."5M  
  // Draw the icon <O]TM-h  
  dc.DrawIcon(x, y, m_hIcon); GQR|t?:t  
 } ~Wox"h}(  
 else .w@o%AO_  
 { dh; L!  
  CDialog::OnPaint(); B0&W wa:  
 } /Ayo78Pi  
} >E:V7Fa  
FVw4BUOmi  
HCURSOR CCaptureDlg::OnQueryDragIcon() :v(fgS2\  
{ .]IidsgM  
 return (HCURSOR) m_hIcon; SZ*Nr=X  
} P%nN#Qm  
);~JyoDo  
void CCaptureDlg::OnCancel() m%[Ul@!V  
{ :I)WSXP9h  
 if(bTray) jH4'jB  
  DeleteIcon(); jJ B+UF=  
  CDialog::OnCancel(); = MP?aH [  
} ;%/Kh :Vg  
%~$P.Zh  
void CCaptureDlg::OnAbout() w:0=L`<Eu  
{ jIOrB}  
 CAboutDlg dlg; #*"5F*  
 dlg.DoModal(); ~dpU D F  
} 8=!BtMd"  
lJR  
void CCaptureDlg::OnBrowse() T`?{Is['(  
{ a7_&;  
 CString str; ZtFOIb*  
 BROWSEINFO bi; 6')pM&`t  
 char name[MAX_PATH]; XLeQxp=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); TS~>9h\;  
 bi.hwndOwner=GetSafeHwnd(); <%~`!n,t0  
 bi.pszDisplayName=name; (8$; 4q[!  
 bi.lpszTitle="Select folder"; a#_=c>h;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4)zHkN+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); HLa3lUo  
 if(idl==NULL) ~%8T_R/3  
  return; SBNeN]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4J"S?HsW|  
 str.ReleaseBuffer(); Km=dId7]  
 m_Path=str; .Zzx W  
 if(str.GetAt(str.GetLength()-1)!='\\') [ BpZ{Ql  
  m_Path+="\\"; jEkO #xI  
 UpdateData(FALSE); |v[0(  
} /&`sB|  
$XOs(>~"r  
void CCaptureDlg::SaveBmp() y7?n;3U]CS  
{ ioZ{2kK  
 CDC dc; X,Q'Xe /  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1_aUU,|.  
 CBitmap bm; ("+J*u*kq_  
 int Width=GetSystemMetrics(SM_CXSCREEN); Kpx(x0^2  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2(<2Gnpl  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !pwY@} oL  
 CDC tdc; bIR&e E  
 tdc.CreateCompatibleDC(&dc); }\s\fNSQ/  
 CBitmap*pOld=tdc.SelectObject(&bm); E5H0Yo.Wi  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7 B<  
 tdc.SelectObject(pOld); :7&-<ae2  
 BITMAP btm; f7mN,_Lt  
 bm.GetBitmap(&btm); -F+ )N$CW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; fC\Cx;q-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \N[Z58R !z  
 BITMAPINFOHEADER bih; N"+o=nS  
 bih.biBitCount=btm.bmBitsPixel; tcm?qro)  
 bih.biClrImportant=0; $0f(Gc|  
 bih.biClrUsed=0; M`~UH\  
 bih.biCompression=0; 5Wyo!pRi  
 bih.biHeight=btm.bmHeight; zHEH?xZ6sD  
 bih.biPlanes=1; [lmghI!  
 bih.biSize=sizeof(BITMAPINFOHEADER); WlJ $p$I`  
 bih.biSizeImage=size; VD,p<u{r  
 bih.biWidth=btm.bmWidth; PGE|){ <  
 bih.biXPelsPerMeter=0; #2XX[d%  
 bih.biYPelsPerMeter=0; _~=qByD   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !(-lY(x  
 static int filecount=0; h !yu. v  
 CString name; lh N2xg5x  
 name.Format("pict%04d.bmp",filecount++); {Y\W&Edw%  
 name=m_Path+name; H2plT  
 BITMAPFILEHEADER bfh; nNN~Z'bG  
 bfh.bfReserved1=bfh.bfReserved2=0; V5ySOgzw,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); T=NF5kj-=  
 bfh.bfSize=54+size; </.9QV  
 bfh.bfOffBits=54; mn>$K"_k  
 CFile bf; a (mgz&*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )yOdRRP  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9HtzBS  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X*Qtbm,  
  bf.WriteHuge(lpData,size); uVQH,NA,  
  bf.Close(); Al 0 i{.V  
  nCount++; i xf~3Y8  
 } ;$\?o  
 GlobalFreePtr(lpData); KliMw*5(  
 if(nCount==1) "IjCuR;#  
  m_Number.Format("%d picture captured.",nCount); n B5:X  
 else b%TS37`^[  
  m_Number.Format("%d pictures captured.",nCount); doERBg`Jh  
  UpdateData(FALSE); MHm=X8eg  
} x$6` k  
d,c8ks(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U)PNY  
{ aLWNqe&1  
 if(pMsg -> message == WM_KEYDOWN) swfcA\7R  
 { 3Y L  
  if(pMsg -> wParam == VK_ESCAPE) Hju7gP=y}  
   return TRUE; us_o{  
  if(pMsg -> wParam == VK_RETURN) U@6bH@v5  
   return TRUE; xYgG  
 } _`H2CXG g  
 return CDialog::PreTranslateMessage(pMsg); XVlZ:kz  
} }:b6WN;c  
)}G?^rDH(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v4pFts$J  
{ 0Bo7EV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?tf/#5t}  
  SaveBmp(); 5q.d$K |  
  return FALSE; >BDK?YMx  
} w[WyT`6h!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6<uJ}3  
 CMenu pop; 8@}R_GZc  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +# 38  
 CMenu*pMenu=pop.GetSubMenu(0); Ny\c>$z  
 pMenu->SetDefaultItem(ID_EXITICON); {x-iBg9#l2  
 CPoint pt; D)]U+Qk  
 GetCursorPos(&pt); fpDx)lQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #]~l]Eq  
 if(id==ID_EXITICON) &8##)tS(y  
  DeleteIcon(); %X--`91|u  
 else if(id==ID_EXIT) 5Oa`1?C1  
  OnCancel(); NB["U"1[^E  
 return FALSE; M<AjtDF%  
} ;T9u$4 <  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tR! !Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |<Cz#| ,q  
 AddIcon(); 3k#?E]'  
 return res; ae&i]K;  
} TIs~?wb$  
TpHvZ]c  
void CCaptureDlg::AddIcon() X J+y5at  
{ pBd_Ba N  
 NOTIFYICONDATA data; /|kR= ~  
 data.cbSize=sizeof(NOTIFYICONDATA); \A{ [2  
 CString tip; =J2cX`  
 tip.LoadString(IDS_ICONTIP); O!,WH?r  
 data.hIcon=GetIcon(0); go6XUe  
 data.hWnd=GetSafeHwnd(); 3y[uH'  
 strcpy(data.szTip,tip); x34 4}\  
 data.uCallbackMessage=IDM_SHELL; zK Y 9 'y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f>*D@TrU  
 data.uID=98; 3 N5un`K7  
 Shell_NotifyIcon(NIM_ADD,&data); y4V~fg;  
 ShowWindow(SW_HIDE); ke+3J\;>  
 bTray=TRUE; (9"w{pnlLc  
} q{fgsc8v\  
0TDc Q  
void CCaptureDlg::DeleteIcon() 'aWrjfDy:  
{ 9*thqs3J#d  
 NOTIFYICONDATA data; U)f;*{U  
 data.cbSize=sizeof(NOTIFYICONDATA); d(=*@epjR  
 data.hWnd=GetSafeHwnd(); MRI`h.  
 data.uID=98; s_/a1o  
 Shell_NotifyIcon(NIM_DELETE,&data); e[Tu.$f-  
 ShowWindow(SW_SHOW); jHU5>Gt-}  
 SetForegroundWindow(); ja<!_^h=At  
 ShowWindow(SW_SHOWNORMAL); 5i<E AKL  
 bTray=FALSE; p#]D-?CM)  
} !XJvhsKXy  
g`2DJi&)  
void CCaptureDlg::OnChange() 3:S>MFRn.3  
{ L.E6~Rv  
 RegisterHotkey(); a/ k0(  
} cl`!A2F1G#  
w_>SxSS7  
BOOL CCaptureDlg::RegisterHotkey() }o'WR'LX  
{ zZhAH('fG  
 UpdateData(); xT]|78h$   
 UCHAR mask=0; Pl>BTo>p'  
 UCHAR key=0; dN8@ 0AMSf  
 if(m_bControl) LU=<? "N6  
  mask|=4; *hk8[  
 if(m_bAlt) d,hKy2  
  mask|=2; ;$VQRXq  
 if(m_bShift) SZ;Is,VgU4  
  mask|=1; 0LjF$3GpZ  
  key=Key_Table[m_Key.GetCurSel()]; $=IJ-_'o  
 if(bRegistered){ 2b[R^O}   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); z-J?x-<  
  bRegistered=FALSE; 'l&),]|$)  
 } &e-MOM2&  
 cMask=mask; #Yqj27&  
 cKey=key; <r8sZrY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5>S<9A|Q  
 return bRegistered; aw3 oG?3I  
} ,>AA2@6zMT  
GY%2EM(  
  四、小结 >" z$p@7  
:vsF4  
  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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