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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: ('W#r"  
  RX>kOp29  
  一、实现方法 P /wc9Yt  
a<sE dp  
  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: sU4(ed\gI\  
 :q;vZ6Xd  
#pragma data_seg("shareddata") Vlce^\s;  
HHOOK hHook =NULL; //钩子句柄 (iGk]Rtzt  
UINT nHookCount =0; //挂接的程序数目 v*QobI  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z]Z>+|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5wRDH1z@{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >9F,=63A  
static int KeyCount =0; DyG3|5s1R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8;p6~&).C~  
#pragma data_seg() kX\t0'=]  
J7emoD [  
  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。 O~9 %!LAu  
6YrkS;_HS  
  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: .Q?cNSWU  
5)V J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR <X j:c2@  
cKey,UCHAR cMask) WDY,?  
{ (p68Qe%OuG  
 BOOL bAdded=FALSE; Lh"Je-x<<  
 for(int index=0;index<MAX_KEY;index++){ @= 6}w_  
  if(hCallWnd[index]==0){ 3w ?)H  
   hCallWnd[index]=hWnd; c>!>D7:7  
   HotKey[index]=cKey; >t'/(y  
   HotKeyMask[index]=cMask; ]0xbvJ8oK  
   bAdded=TRUE; [xk1}D  
   KeyCount++; Ws4aCH1  
   break; W )q^@6[d  
  } rYeFYPS  
 } rcq(p (!  
 return bAdded; bL!NT}y`  
} f'aUo|^?  
//删除热键 "2 ma]Ps  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R"!.|fH6  
{ +=|Q'V  
 BOOL bRemoved=FALSE; n O$(\ z)  
 for(int index=0;index<MAX_KEY;index++){ {08UBnR  
  if(hCallWnd[index]==hWnd){ iF{eGi  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )1lR;fD  
    hCallWnd[index]=NULL; c3P  
    HotKey[index]=0; -#Yg B5  
    HotKeyMask[index]=0; 9O?.0L  
    bRemoved=TRUE; /^DDU!=(<  
    KeyCount--; {]] nQ  
    break; M=x/PrY"R  
   } pJVzT,poh  
  } :"3WCB  
 } Bg"b,&/^u  
 return bRemoved; @YU}0&  
} ~ra2Xyl  
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  DLL中的钩子函数如下: BGodrb1  
wP6~HiC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $oH?oD1  
{ bh6Mh< +  
 BOOL bProcessed=FALSE; g/mVd;#o  
 if(HC_ACTION==nCode) Up*p*(d3  
 { hrN r i$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |M[E^  
   switch(wParam) k^p|H:  
   {  MH'S,^J  
    case VK_MENU: Mm :6+  
     MaskBits&=~ALTBIT; .O3i"X]  
     break; pYI`5B4  
    case VK_CONTROL: g>_6O[;t%  
     MaskBits&=~CTRLBIT; (pH13qU5  
     break; >72j,0=e  
    case VK_SHIFT: `U#*O+S-^  
     MaskBits&=~SHIFTBIT; PGP9-M  
     break; 2!-ZNd:(+  
    default: //judge the key and send message LP7t*}PK  
     break; C=h$8Q  
   } Dsm_T1X  
   for(int index=0;index<MAX_KEY;index++){ )j4]Y dJ  
    if(hCallWnd[index]==NULL) %8yfF rk  
     continue; ?Re@`f+*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vZTX3c:,1  
    { s)_7*DY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]V<[W,*(5  
     bProcessed=TRUE; :w#Zs)N  
    } ya5;C"   
   } {|^9y]VFu  
  } Um4 }`  
  else if((lParam&0xc000ffff)==1){ //有键按下 tUGnD<P  
   switch(wParam) s59v* /  
   { z=N'evx~  
    case VK_MENU: YnNB#x8|  
     MaskBits|=ALTBIT; { e<J}-/?  
     break; (%oZgvM  
    case VK_CONTROL: ,`^B!U3m   
     MaskBits|=CTRLBIT; 8,a&i:C  
     break; 9<.FwV >  
    case VK_SHIFT: F6}Pwz[c  
     MaskBits|=SHIFTBIT; DFwkd/3"  
     break; ,1Suq\ L  
    default: //judge the key and send message c;&m}ImLe.  
     break; P cnr  
   } /wljb b/s  
   for(int index=0;index<MAX_KEY;index++){ ?>1AT ==wI  
    if(hCallWnd[index]==NULL) 7;5?2)+=6  
     continue; T6Z2 #  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fs|fo-+H}k  
    { ES;7_.q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "e69aAA,  
     bProcessed=TRUE; q+19EJ(  
    } [~W"$sT  
   } #@;RJJZg  
  } k*J}/HO  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D}SRr,4v  
   for(int index=0;index<MAX_KEY;index++){ 8ysU.5S  
    if(hCallWnd[index]==NULL) =IkQ;L&  
     continue; \'q-Xr'}M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) up=4B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q|@!zMy  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %+L:Gm+^g#  
   } f h)Cz)  
  } I')URk[  
 } 2Y(P hw2%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~x)Awdlu  
} QjWv?tm  
7Wmk"gp  
  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: u&I?LZ-=,  
TKx.`Cf m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U-QK   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O/e5LA  
Gx|$A+U  
  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: jF<Y,(C\  
NN\% X3ri"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lf4-Ci*X  
{ 05g U~6AF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) D(Pd?iQIO  
 { MG*#-<OV.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^+F@KXn L  
  SaveBmp(); we4e>)  
  return FALSE; 8Focs p2  
 } X-|`|>3E  
 …… //其它处理及默认处理 $z1u>{  
} 7m~+HM\  
Uq<c+4)5  
}y(1mzb  
  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。 o|>2X[T  
94=Wy-  
  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。 zy(sekX;  
k:Da+w_'1  
  二、编程步骤 t.t$6+"5We  
|g;hXr#~  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ?SK1*; i  
.2q7X{4=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; b2aPo M=  
"o*(i7T=n  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; *NS:X7p!V  
;2(8&.  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; - jfZLO4  
&?"(al?  
  5、 添加代码,编译运行程序。 \l?\%aqm  
VU J*\Sg  
三、程序代码 Ck%nNy29  
3 q^3znt  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jutEb@nog  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) iBVV5 f  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ T6=,A }t-  
#if _MSC_VER > 1000 6{B$_Usg  
#pragma once OIGu`%~js  
#endif // _MSC_VER > 1000 -GLI$_lLF  
#ifndef __AFXWIN_H__ n2zJ'  
#error include 'stdafx.h' before including this file for PCH 26B]b{Iz{  
#endif =H%c/Jty  
#include "resource.h" // main symbols o9(:m   
class CHookApp : public CWinApp Wz)s#  
{ _Jx.?8  
 public: T?4MFx#  
  CHookApp(); $ jWe!]ASU  
  // Overrides 8)\Td tBf9  
  // ClassWizard generated virtual function overrides *v 1hMk  
  //{{AFX_VIRTUAL(CHookApp) u27K 0}  
 public: O68/Hf1W  
  virtual BOOL InitInstance(); ,j>A[e&.  
  virtual int ExitInstance(); /oKa?iT  
  //}}AFX_VIRTUAL |k1(|)%G  
  //{{AFX_MSG(CHookApp) #!wu}nDu  
  // NOTE - the ClassWizard will add and remove member functions here. qPDe;$J)  
  // DO NOT EDIT what you see in these blocks of generated code ! }enm#0Ha  
  //}}AFX_MSG PN:/lIO  
  DECLARE_MESSAGE_MAP() H:Y?("k  
}; @W[`^jfQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f]W$4f {  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %ZF47P%6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _CN5,mLNRk  
BOOL InitHotkey(); 15U]/?jv8  
BOOL UnInit(); ZX[ @P?A+-  
#endif /Fy2ZYs,`8  
b-ZC~#?|b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. uDvZ]Q|.  
#include "stdafx.h" o *)>aw  
#include "hook.h" 7TD%vhbiwi  
#include <windowsx.h> m>B^w)&C  
#ifdef _DEBUG hg[ob+"  
#define new DEBUG_NEW %"B+;{y(5  
#undef THIS_FILE L9ECF;)  
static char THIS_FILE[] = __FILE__; MKzIY:u g  
#endif O W`yv  
#define MAX_KEY 100 8MqKS}\H  
#define CTRLBIT 0x04 D@A@5pvS  
#define ALTBIT 0x02 mX66}s}#  
#define SHIFTBIT 0x01 VN6h:-&iY  
#pragma data_seg("shareddata") =$xxkc.~G  
HHOOK hHook =NULL; OZ##x  
UINT nHookCount =0; ,'w9@A  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ncZ5r0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT f|Dq#(^\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey HjCcfOej  
static int KeyCount =0; 8WU_d`DF  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift V| 9<*  
#pragma data_seg() D32~>J.F  
HINSTANCE hins; ]yI~S(  
void VerifyWindow(); :Rl*64}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) zt,pV \|  
//{{AFX_MSG_MAP(CHookApp) Af y\:&j  
// NOTE - the ClassWizard will add and remove mapping macros here. F|9:$Jpw!  
// DO NOT EDIT what you see in these blocks of generated code! J:WO %P=Q  
//}}AFX_MSG_MAP 6?\X)qBI  
END_MESSAGE_MAP() 0} v_usP  
?=$=c8xw  
CHookApp::CHookApp() (jhDO7  
{ j0P+<@y  
 // TODO: add construction code here, o^HzE;L}  
 // Place all significant initialization in InitInstance )vWI{Q]r  
} ,xmL[Yk,  
6j uNn}  
CHookApp theApp; H|@R+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .YOC|\  
{ fP 4  
 BOOL bProcessed=FALSE; J; @g#h?  
 if(HC_ACTION==nCode) Y6<"_  
 { 93I.Wp_{  
  if((lParam&0xc0000000)==0xc0000000){// Key up >Z%qkU/  
   switch(wParam) EhJpJb[Z  
   { -aj) _.d  
    case VK_MENU: 3s25Rps  
     MaskBits&=~ALTBIT; h|m>JDxn  
     break; w K)/m`{g  
    case VK_CONTROL: o m9zb&{tu  
     MaskBits&=~CTRLBIT; Ib V 7}  
     break; =?9z6=  
    case VK_SHIFT: fu 0]BdM  
     MaskBits&=~SHIFTBIT; Qmbl_#  
     break; 9qe<bds1  
    default: //judge the key and send message JSKAlw  
     break; +E5EOo{ `|  
   } W[ZW=c  
   for(int index=0;index<MAX_KEY;index++){ 2g'o5B\ *  
    if(hCallWnd[index]==NULL) /D@(o`a  
     continue; N5m+r.<;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lxSCN6  
    { 67,@*cK3?J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `]*BDSvE  
     bProcessed=TRUE; 7l+>WB_]  
    } d4(!9O.\  
   } w+ MCOAB  
  } w&U>w@H^  
  else if((lParam&0xc000ffff)==1){ //Key down 4<c #3]  
   switch(wParam) #@qd.,]2  
   { qC|$0  
    case VK_MENU: q,ur[ &<  
     MaskBits|=ALTBIT; JIJ79HB  
     break; 0xZX%2E  
    case VK_CONTROL: 7R4xJ H  
     MaskBits|=CTRLBIT; |-vc/t2k>T  
     break; \~ACWF7l  
    case VK_SHIFT: )$Tcip`  
     MaskBits|=SHIFTBIT; XHX$Ur9  
     break; (A<'{J#5,  
    default: //judge the key and send message (bT3 r_  
     break; iRwlK5(&  
   } ~]Md*F[4*e  
   for(int index=0;index<MAX_KEY;index++) Aw~N"i  
   { TOUP.,f/!  
    if(hCallWnd[index]==NULL) i7 *cpNPO  
     continue; +0&SXhy%y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3d_PY,=1  
    { m`3Mev  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g#Doed.30=  
     bProcessed=TRUE; Z#Q)a;RA  
    } 6<%W 8m\  
   } e 9p+  
  } t93iU?Z  
  if(!bProcessed){ E]opA$JQ  
   for(int index=0;index<MAX_KEY;index++){ ;8VvpO^G/  
    if(hCallWnd[index]==NULL) PR{y84$  
     continue; (K"8kQLY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =5 zx]N1r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6X1_NbC  
   } ,sn/FT^; q  
  } +[2X@J  
 } OvFWX%uY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hp:8e@  
} h~ F`[G/'  
LEM^8G]O  
BOOL InitHotkey() ptcG:  
{ kVG]zt2  
 if(hHook!=NULL){ VOmWRy"L  
  nHookCount++; [p 6#fG *  
  return TRUE; 1Vden.H*CI  
 } *CnrzrKtQ  
 else l>H G|ol  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); pN]$|#%q(  
  if(hHook!=NULL) @X\2K?c(v  
   nHookCount++; #!h +K"wX  
  return (hHook!=NULL); Y64B"J=P 9  
} pbM"tr_A{  
BOOL UnInit() P0/B!8x  
{ L.]mC !  
 if(nHookCount>1){ 9F*],#ng  
  nHookCount--; |ULwUi-r  
  return TRUE; 1zz.`.R2U  
 } 1!;}#m7v  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #"Wh$x%  
 if(unhooked==TRUE){ KPT@I3P  
  nHookCount=0; l}Fa-9_'  
  hHook=NULL; m4@f&6x  
 } #9Fe,  
 return unhooked; OP-%t\sj>  
} +.p$Yi`  
6BPZ2EQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |B0.*te6  
{ e>oE{_e  
 BOOL bAdded=FALSE;  fK$N|r  
 for(int index=0;index<MAX_KEY;index++){ _:tclBc8R  
  if(hCallWnd[index]==0){ c= -2c&=&  
   hCallWnd[index]=hWnd; q|8p4X}/]  
   HotKey[index]=cKey; "eH~/6A  
   HotKeyMask[index]=cMask; c/c%-=  
   bAdded=TRUE; te+5@k#t  
   KeyCount++; iN}BMd.U  
   break; <_|H]^o  
  } ]:Q7Gys  
 } jJ' LM>e  
 return bAdded; ? 77ye  
} @c8s<9I]  
!Qg%d&q.Sx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;[_w&"[6a  
{ )~](qLSl  
 BOOL bRemoved=FALSE; ^1%gQ@P  
 for(int index=0;index<MAX_KEY;index++){ M?UlC   
  if(hCallWnd[index]==hWnd){ OoFQ@zE7%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aoZ`C3  
    hCallWnd[index]=NULL; ?Z<2zm%qV  
    HotKey[index]=0; R.g'&_zx  
    HotKeyMask[index]=0; 3x 9O(;k  
    bRemoved=TRUE; AlQ!Q)y<@  
    KeyCount--; I:~L!%  
    break; z"eh.&T  
   } Wu 71q=  
  } OGy/8B2c  
 } p,?8s%  
 return bRemoved; '9,14e6   
} J-W, ^%  
Y=gj{]4  
void VerifyWindow() ]c8$%  
{ 9iQcK&D 2  
 for(int i=0;i<MAX_KEY;i++){ RfT#kh/5  
  if(hCallWnd!=NULL){ h&!k!Su3#  
   if(!IsWindow(hCallWnd)){ Cf_Ik  
    hCallWnd=NULL; #"M 'Cs  
    HotKey=0; C/P,W>8  
    HotKeyMask=0; {C%/>e2-%  
    KeyCount--; N_vVEIO9  
   } 7eh|5e$@  
  } HY]vaA`  
 } 5k`[a93T  
} F_SkS?dB  
tVhY=X{N?  
BOOL CHookApp::InitInstance() OpwZTy}1}  
{ t[6g9e$  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;+-$=l3[a  
 hins=AfxGetInstanceHandle(); ]|q\^k)JU  
 InitHotkey(); ,i2%FW  
 return CWinApp::InitInstance(); qj71 rj  
} Ru?Ue4W^b  
Av*R(d=`  
int CHookApp::ExitInstance() (BC3[R@/l  
{ }9=\#Le~\  
 VerifyWindow(); O_f|R1G5z  
 UnInit(); /$hfd?L  
 return CWinApp::ExitInstance(); 9Byk/&$U  
} Z`xz|:D+  
(k"oV>a|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ufdC'2cp8  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z6&s 6MF  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =+{.I,g}g@  
#if _MSC_VER > 1000 tUq* -9 V  
#pragma once >GiM?*cC  
#endif // _MSC_VER > 1000 x8T5aS  
n=RAE^[M  
class CCaptureDlg : public CDialog XN"V{;OP1  
{ Z'GO p?  
 // Construction /UjRuUC]  
 public: NQ<~$+{  
  BOOL bTray; I}Z[F,}*J  
  BOOL bRegistered; -A9 !Y{Z  
  BOOL RegisterHotkey(); Y#PbC  
  UCHAR cKey; wLD/#Hfi7  
  UCHAR cMask; [;VNuF  
  void DeleteIcon(); _Z6/r^c  
  void AddIcon(); r0kA47  
  UINT nCount; &86km FA  
  void SaveBmp(); 1){1 HK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +a sJV1a  
  // Dialog Data t8s1d  
  //{{AFX_DATA(CCaptureDlg) l)z15e5X  
  enum { IDD = IDD_CAPTURE_DIALOG }; Q8M&nf  
  CComboBox m_Key; %^"Tz,f  
  BOOL m_bControl; IxCEE5+`%  
  BOOL m_bAlt; .i/]1X*;r^  
  BOOL m_bShift; lN+NhPF  
  CString m_Path; i^uC4S~  
  CString m_Number;  zUqiz  
  //}}AFX_DATA )dLESk  
  // ClassWizard generated virtual function overrides i{VjSWq  
  //{{AFX_VIRTUAL(CCaptureDlg) .jr1<LE  
 public: p;j$i6YJ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0|{U"\  
 protected: 3WJ> T1we  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v?<x"XKR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ##u+[ !  
  //}}AFX_VIRTUAL xP'IyABx  
  // Implementation 7& k lX  
 protected: )+ Wr- Yay  
  HICON m_hIcon;  b6S86>  
  // Generated message map functions %kJ:{J+w]  
  //{{AFX_MSG(CCaptureDlg) j&fr4t3  
  virtual BOOL OnInitDialog(); |1 is!leP  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -baGr;,Cu  
  afx_msg void OnPaint(); ,-c(D-&  
  afx_msg HCURSOR OnQueryDragIcon(); OP2!lEs  
  virtual void OnCancel(); da!N0\.1T  
  afx_msg void OnAbout(); ru(Xeojv#  
  afx_msg void OnBrowse(); 8Mg4y1)RU  
  afx_msg void OnChange(); /Fh"Gl^  
 //}}AFX_MSG qPE(Lt1  
 DECLARE_MESSAGE_MAP() VR_+/,~  
}; 7^KQQ([  
#endif D5T\X-+]O  
; Z61|@Y  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]-%ZN+  
#include "stdafx.h" ]rn!+z  
#include "Capture.h" lIzJO$8cM  
#include "CaptureDlg.h" w}NgFrL  
#include <windowsx.h> A i9*w?C  
#pragma comment(lib,"hook.lib") K;6K!6J:[  
#ifdef _DEBUG tb/u@}")  
#define new DEBUG_NEW FPMhHHM  
#undef THIS_FILE 4,s: G.g  
static char THIS_FILE[] = __FILE__; 'cw0FpQ;  
#endif <l wI|<  
#define IDM_SHELL WM_USER+1 q9WdJ!-^X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RO wbzA)]r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l,*Q?q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >Fx$Rty  
class CAboutDlg : public CDialog < q; ]  
{ ; tvB{s_  
 public: OM!ES%c,  
  CAboutDlg();  Kz3u  
  // Dialog Data h,140pW  
  //{{AFX_DATA(CAboutDlg) 1V+1i)+  
  enum { IDD = IDD_ABOUTBOX }; s ^V8FH  
  //}}AFX_DATA }~QB2&3  
  // ClassWizard generated virtual function overrides m1F<L  
  //{{AFX_VIRTUAL(CAboutDlg) 5Tu#o ()  
 protected: l`I]eTo)^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {k?Y :  
  //}}AFX_VIRTUAL f[.hN  
  // Implementation W]2;5 `MM  
 protected: s7xRry  
  //{{AFX_MSG(CAboutDlg) ~g|e?$j  
  //}}AFX_MSG h%=b"x  
  DECLARE_MESSAGE_MAP() xA!o"VZPq7  
}; $Q{1^  
`t!iknOQ$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aGpRdF1;!  
{ zo} SS[  
 //{{AFX_DATA_INIT(CAboutDlg) Vg \-^$  
 //}}AFX_DATA_INIT a _  
} ~iwEhF   
AF3t#)q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M8cLh!!  
{ _"0n.JQg  
 CDialog::DoDataExchange(pDX); 'hya#rC&(  
 //{{AFX_DATA_MAP(CAboutDlg) K7f-g]Ibdn  
 //}}AFX_DATA_MAP |!!E5osXq  
} /mD KQ<  
[7I|8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )&dhE^ O  
 //{{AFX_MSG_MAP(CAboutDlg) d}l^yln  
 // No message handlers cC}s5`  
 //}}AFX_MSG_MAP VpV w:Rh>  
END_MESSAGE_MAP() huKz["]z[  
p*npY"}v  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YSa:"A  
: CDialog(CCaptureDlg::IDD, pParent) "BFW&<1  
{ '|XP}V0I  
 //{{AFX_DATA_INIT(CCaptureDlg) e/Q[%y.X  
  m_bControl = FALSE; $}KYpSV  
  m_bAlt = FALSE; @{CpC  
  m_bShift = FALSE; U1q$B32  
  m_Path = _T("c:\\"); +:'Po.{"  
  m_Number = _T("0 picture captured."); nr-mf]W&  
  nCount=0; )<^ ~${$U  
  bRegistered=FALSE; ok6e=c '  
  bTray=FALSE; :T{or-  
 //}}AFX_DATA_INIT oTa! F;I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wj'iU&aca  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0x`:jz`  
} \ 3LD^[qi  
(QRl -| +  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #[[p/nAy}A  
{ 6op\g].P  
 CDialog::DoDataExchange(pDX); =u'/\nxCF  
 //{{AFX_DATA_MAP(CCaptureDlg) |Q I3H]T7  
  DDX_Control(pDX, IDC_KEY, m_Key);  +;!w;t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); WX=+\`NyJ(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); P)\f\yb  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4Dd9cG,lN  
  DDX_Text(pDX, IDC_PATH, m_Path); RsOK5XnQn  
  DDX_Text(pDX, IDC_NUMBER, m_Number); " LxJPt\  
 //}}AFX_DATA_MAP H~~(v52wD  
} yv:NH|,/y  
@<6-uk3S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X_YD[  
//{{AFX_MSG_MAP(CCaptureDlg) ` q@~78`  
 ON_WM_SYSCOMMAND() EV(/@kN2  
 ON_WM_PAINT() A!Yqj~  
 ON_WM_QUERYDRAGICON() eoL)gIM%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +nZG!nP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #-f^;=7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5-3gsy/Mo  
//}}AFX_MSG_MAP ^7''x,I  
END_MESSAGE_MAP() .XE]vo  
?#[K&$}  
BOOL CCaptureDlg::OnInitDialog() b gD Dys  
{ 3AL.UBj&}  
 CDialog::OnInitDialog(); $I/p6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ueg X  
 ASSERT(IDM_ABOUTBOX < 0xF000); iB,*X[}EqG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U^YPL,m1  
 if (pSysMenu != NULL) 8)tyn'~i  
 { FD-)nv2:  
  CString strAboutMenu; b;O+QRa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8&;dR  
  if (!strAboutMenu.IsEmpty()) }dR *bG  
  { @t^ 2/H ?O  
   pSysMenu->AppendMenu(MF_SEPARATOR); <|_Ey)1 6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Aa Ma9hvT!  
  } 0x & ^{P~  
 } 'oEmbk8Hg  
 SetIcon(m_hIcon, TRUE); // Set big icon i~9)Hz;!  
 SetIcon(m_hIcon, FALSE); // Set small icon 950b9Vn&  
 m_Key.SetCurSel(0); `^}9= Q'r  
 RegisterHotkey(); tp]|/cx4  
 CMenu* pMenu=GetSystemMenu(FALSE); =@z"k'Vl`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eo80L  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a&[nVu+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); BY d3rI  
 return TRUE; // return TRUE unless you set the focus to a control ={Hbx> p  
} Sce9R?II  
B dKwWgi+a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) **"P A8   
{ @hvq,[   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) w&gHmi  
 { hJ@nW5CI  
  CAboutDlg dlgAbout; ^v'Lu!\f  
  dlgAbout.DoModal(); {8MF!CG]  
 } y*D 8XI$  
 else PA/6l"-`3  
 { 5e LPn  
  CDialog::OnSysCommand(nID, lParam); 5 9vGLN!L  
 } ;@ e |}Gk  
} :+=*  
IviWS84  
void CCaptureDlg::OnPaint() Pm_=   
{ 21[F%,{.),  
 if (IsIconic()) IW#(ICeb  
 { #n"/9%35f`  
  CPaintDC dc(this); // device context for painting ?xet:#R'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P:v y  
  // Center icon in client rectangle O+N-x8W{  
  int cxIcon = GetSystemMetrics(SM_CXICON); <gy'@w?  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0d2%CsMS"D  
  CRect rect; tFQFpbI  
  GetClientRect(&rect); $3ILVT  
  int x = (rect.Width() - cxIcon + 1) / 2; 1:t>}[Y  
  int y = (rect.Height() - cyIcon + 1) / 2; Qi61(lK  
  // Draw the icon 3C2 >   
  dc.DrawIcon(x, y, m_hIcon); &M!:,B  
 } "mf;k^sqS  
 else Xy{+=UY  
 { cPbz7  
  CDialog::OnPaint(); ZS+2.)A  
 } q|l|gY1g)  
} nGVqVSxKT  
9PAp*`J@kr  
HCURSOR CCaptureDlg::OnQueryDragIcon() UPYM~c+}  
{ bq O"k t  
 return (HCURSOR) m_hIcon; 1#(1Bs6X  
} "J#:PfJ%  
-ZB"Yg$l  
void CCaptureDlg::OnCancel() -,dQ&Qf?  
{ D |o@(V  
 if(bTray) R;o_*  
  DeleteIcon(); qHCs{ u  
  CDialog::OnCancel(); X3[!xMij  
} :dzU]pk%0  
+0 MKh  
void CCaptureDlg::OnAbout() Sx2j~(pOr  
{ IoA;q)  
 CAboutDlg dlg; BR2y1Hfi  
 dlg.DoModal(); YSgF'qq\  
} &; \v_5N6  
v,&2 !Zv  
void CCaptureDlg::OnBrowse() sFQ|lU"n  
{ 3_$eQ`AAA  
 CString str; Ub,unU  
 BROWSEINFO bi; l 5FQ!>IM  
 char name[MAX_PATH]; +$t%L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); S2)S/ nf  
 bi.hwndOwner=GetSafeHwnd(); *-_Np u6  
 bi.pszDisplayName=name; 7&4,',0VL  
 bi.lpszTitle="Select folder"; 1RA$hW@}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >Il`AR;D  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); y~7lug  
 if(idl==NULL) Pc'?p  
  return; N+5 ^h(~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gEP E9ew  
 str.ReleaseBuffer(); %S.U`(.  
 m_Path=str; vXbT E$  
 if(str.GetAt(str.GetLength()-1)!='\\') aTsfl  
  m_Path+="\\"; 0K ?(xB  
 UpdateData(FALSE); YHYB.H)  
} {O) &5  
W#j,{&KVn  
void CCaptureDlg::SaveBmp() @3YuV=QfH  
{ U[l%oLra  
 CDC dc; ItADO'M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5H+k_U  
 CBitmap bm; lIg2iun[n  
 int Width=GetSystemMetrics(SM_CXSCREEN); Tm52=+uf$  
 int Height=GetSystemMetrics(SM_CYSCREEN); Q=E@i9c9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); SWpUVZyd  
 CDC tdc; \BXVWE|  
 tdc.CreateCompatibleDC(&dc); or}*tSKX  
 CBitmap*pOld=tdc.SelectObject(&bm); de9l;zF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |`wsKr'  
 tdc.SelectObject(pOld); 7-I>5 3@  
 BITMAP btm; VU9P\|c@<  
 bm.GetBitmap(&btm); zF&UdS3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5#.\pR{Gd  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vc #oALc&  
 BITMAPINFOHEADER bih; vv/,Rgv  
 bih.biBitCount=btm.bmBitsPixel; ^z^e*<{WEl  
 bih.biClrImportant=0; on?/tHys  
 bih.biClrUsed=0; +E|ouFI  
 bih.biCompression=0; 9^ p{/Io  
 bih.biHeight=btm.bmHeight; |+-i'N9  
 bih.biPlanes=1; e"#D){k#  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4Z9wzQ>  
 bih.biSizeImage=size; ~+C?][T  
 bih.biWidth=btm.bmWidth; 8"mW!M  
 bih.biXPelsPerMeter=0; D^55:\4(  
 bih.biYPelsPerMeter=0; W"(`n4hi3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); RJwIN,&1.  
 static int filecount=0; $3[\:+  
 CString name; /v4S@SQ+  
 name.Format("pict%04d.bmp",filecount++); yB%)D0  
 name=m_Path+name; xY2_*#{.  
 BITMAPFILEHEADER bfh; c8tC3CrKp=  
 bfh.bfReserved1=bfh.bfReserved2=0; h;qy5KS  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^alZ\!B8  
 bfh.bfSize=54+size; R2THL  
 bfh.bfOffBits=54; Wx$q:$h@q  
 CFile bf; Fx5d@WNa>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1xAFu+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); p''"E$B/(  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); KTjlWxD  
  bf.WriteHuge(lpData,size); @B[Cc`IN"  
  bf.Close(); cuaNAJ  
  nCount++; (%yc5+f!  
 } ,M.!z@  
 GlobalFreePtr(lpData); 6F.7Ws <  
 if(nCount==1) r/hyW6e_  
  m_Number.Format("%d picture captured.",nCount); kN |5 J  
 else -{U>} Y)  
  m_Number.Format("%d pictures captured.",nCount); "C.7;Rvkp>  
  UpdateData(FALSE); exO#>th1  
} )S};k=kG  
$n Sh[ {  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4UD=Y?zK  
{ I9un  
 if(pMsg -> message == WM_KEYDOWN) %m{.l4/!O  
 { Fra>|;do  
  if(pMsg -> wParam == VK_ESCAPE) D&l ,SD  
   return TRUE; G yAgPz  
  if(pMsg -> wParam == VK_RETURN) U5CPkH1  
   return TRUE; Ldhk^/+  
 } 1Uemsx%'k  
 return CDialog::PreTranslateMessage(pMsg); q7f;ZK=f  
} +O$:  
N1N{Ol'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'K`Rbhy  
{ ~,*YmB=Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T<+ht8&M8  
  SaveBmp(); #3K,V8(  
  return FALSE; [AZ aT  
} q@!'R{fu  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "WbVCT'i  
 CMenu pop; g(1B W#$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); gFs/012{  
 CMenu*pMenu=pop.GetSubMenu(0); @>fO;*  
 pMenu->SetDefaultItem(ID_EXITICON); sCtw30BL  
 CPoint pt; 7e c0Xh1  
 GetCursorPos(&pt); p/k<wCm6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); poQdI?ed,  
 if(id==ID_EXITICON) F|?+>c1}  
  DeleteIcon(); 9#&W!f*qO|  
 else if(id==ID_EXIT) l^ 0_> R  
  OnCancel(); hzQ+9-qA  
 return FALSE; /}$T38  
} :Wg-@d  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); hB7pR"P  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xd|~+4  
 AddIcon(); !ASoXQRz  
 return res; TD{=L*{+  
} 2:iYYRrg  
|ck ZyDA  
void CCaptureDlg::AddIcon() & &" 'dL  
{ Lo9G4Cu  
 NOTIFYICONDATA data; z^rhgs?4  
 data.cbSize=sizeof(NOTIFYICONDATA); h;%i/feFg  
 CString tip; Ln=>@  
 tip.LoadString(IDS_ICONTIP); x*h`VS(?6  
 data.hIcon=GetIcon(0); d]CviQUq  
 data.hWnd=GetSafeHwnd(); 97Zk P=Cq  
 strcpy(data.szTip,tip); Wm)-zvNY;  
 data.uCallbackMessage=IDM_SHELL; NFY|^*bll  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; cZe'!CQS  
 data.uID=98; 7Aio`&^  
 Shell_NotifyIcon(NIM_ADD,&data); @ )vy'qP d  
 ShowWindow(SW_HIDE); f2 ydL/M,  
 bTray=TRUE; 0L:V#y-*  
} lmhbF  
1Y=AT!"V  
void CCaptureDlg::DeleteIcon() ', sQ/#S  
{ xvR?~  
 NOTIFYICONDATA data; z1f^p7$M?  
 data.cbSize=sizeof(NOTIFYICONDATA); |^Ew<  
 data.hWnd=GetSafeHwnd(); }PI35i1!t  
 data.uID=98; LG=X)w)W4S  
 Shell_NotifyIcon(NIM_DELETE,&data); \5'O.*pr  
 ShowWindow(SW_SHOW); %j *k  
 SetForegroundWindow(); *D?((_+  
 ShowWindow(SW_SHOWNORMAL); _Z+jQFKJ\8  
 bTray=FALSE; =[P%_v``  
} ~V2ajM1Z&O  
4= Tpi`  
void CCaptureDlg::OnChange() .pM &jni Y  
{ Z 7s;F}=  
 RegisterHotkey(); 3@^>#U   
} hN gpp-  
-DP8NTl"  
BOOL CCaptureDlg::RegisterHotkey() G la@l<  
{ pbDw Lo]  
 UpdateData(); xH<'GB)  
 UCHAR mask=0; +{xMIl_  
 UCHAR key=0; G{kj}>kS_  
 if(m_bControl) ^:4L6  
  mask|=4; (Sth:{;  
 if(m_bAlt) uxa=KM1H  
  mask|=2; Q[J [=  
 if(m_bShift) _0,"vFdj  
  mask|=1; 8 7RHA $?  
  key=Key_Table[m_Key.GetCurSel()]; 7qP4B9S  
 if(bRegistered){ oGm1d{_-O  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7E$eN8H  
  bRegistered=FALSE; Fweh =v  
 } >Hi h  
 cMask=mask; g/IH|Z=A  
 cKey=key; w]};0v&\~s  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I*D<J$ 9N  
 return bRegistered; v%lv8Lar'  
} $sEB'>:  
?"{QK:`  
  四、小结 PZys  u  
gyi)T?uS)  
  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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