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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: X@7K#@5  
  ,w/f :-y  
  一、实现方法  YErn50L  
WsCzC_'j.  
  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: +6* .lRA  
N#`aVW'{v2  
#pragma data_seg("shareddata") 6c>tA2G|8  
HHOOK hHook =NULL; //钩子句柄 ?ixzlDto\  
UINT nHookCount =0; //挂接的程序数目 \T_?<t,UT  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 IJnr^S8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f-tV8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )>LC*_v  
static int KeyCount =0; C9}2F{8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 uhLg2G^h  
#pragma data_seg() &xqe8!FeA  
g/q$;cB  
  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。 CFh&z^]PR  
'g a1SbA]  
  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: H\3CvFm  
Xklp6{VH9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [VPqI~u5)  
cKey,UCHAR cMask) ZtEHP`Iin  
{ NC vwg  
 BOOL bAdded=FALSE; }# -N7=h  
 for(int index=0;index<MAX_KEY;index++){ 3RRZVc* ^  
  if(hCallWnd[index]==0){ ' U)~|(\i  
   hCallWnd[index]=hWnd; ?#kI9n<O  
   HotKey[index]=cKey; 7@vc Qv kC  
   HotKeyMask[index]=cMask; @ec QVk  
   bAdded=TRUE; =dX*:An  
   KeyCount++; {F k]X#j  
   break; ;8g#"p*&  
  } (cYc03"  
 } -JZl?hY(  
 return bAdded; >CPkL_@VZ=  
} jVRd[  
//删除热键 uB,B%XHj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HXdPKS4q  
{ aXC`yQ?  
 BOOL bRemoved=FALSE; ~N'KIP[W  
 for(int index=0;index<MAX_KEY;index++){ }C#YR( ]  
  if(hCallWnd[index]==hWnd){ jd2Fh):q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +d6E)~qKL  
    hCallWnd[index]=NULL; v:6b&wS L3  
    HotKey[index]=0; $z mES tcm  
    HotKeyMask[index]=0; FcW ?([l  
    bRemoved=TRUE; Lp ]d4"L;3  
    KeyCount--; }UGPEf\  
    break; I;-{#OE,  
   } 1C$^S]v%a  
  } K.z}%a  
 } yl'~H;su  
 return bRemoved; WejY b;KS  
} v8%]^` '  
,Fr{i1Ky  
6PMu;#  
  DLL中的钩子函数如下: *q0N$}k  
OC>" +  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZY/at/v  
{ p-7dJ  
 BOOL bProcessed=FALSE; 7>ODaj   
 if(HC_ACTION==nCode) "Z{^i3 gN  
 { +bO{U C[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d=5D 9' +  
   switch(wParam) QHM39Eu]  
   {  ;:!LAe  
    case VK_MENU: 9xKFX|*$  
     MaskBits&=~ALTBIT; Lw#h nLI.  
     break; nu3 A'E`'k  
    case VK_CONTROL: }%1E9u  
     MaskBits&=~CTRLBIT; AjlG_F  
     break; YT:1=Nf}  
    case VK_SHIFT: Rp<Xu6r  
     MaskBits&=~SHIFTBIT;  ]t=>#  
     break; ,f1wN{P  
    default: //judge the key and send message e!-'O0-Kw  
     break; OS9v.pz  
   } };+s0:H  
   for(int index=0;index<MAX_KEY;index++){ <^~F~]wnH  
    if(hCallWnd[index]==NULL) S; c=6@"  
     continue; W[?B@sdSZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ='JX_U`A^F  
    { B 3h<K}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ww p^dx`!  
     bProcessed=TRUE; E7<:>Uh  
    } i!HGM=f  
   } TXaXJIp  
  } fr?eOigbl  
  else if((lParam&0xc000ffff)==1){ //有键按下 MQ+ek4  
   switch(wParam) QCo^#-   
   { 8vRiVJ8QS:  
    case VK_MENU: 9j"\Lr*o "  
     MaskBits|=ALTBIT; l}^#kHSyd  
     break; ,J^Op   
    case VK_CONTROL: e)7)~g54  
     MaskBits|=CTRLBIT; bDo'hDmW  
     break; $>UzXhf}\  
    case VK_SHIFT: } :mI6zsNj  
     MaskBits|=SHIFTBIT; $!f$R`R^Q\  
     break; 1fy{@j(W  
    default: //judge the key and send message cTnbI4S;  
     break; M<)2  
   } GN<I|mGLJK  
   for(int index=0;index<MAX_KEY;index++){ hF~B&^dd.  
    if(hCallWnd[index]==NULL) $ T4PC5.  
     continue; 6S<$7=$ =  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %awS*  
    { ,gvX ~k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `9+EhP$RS  
     bProcessed=TRUE; IO#W#wW$M  
    } L@Z &v'A  
   } ~30Wb9eL  
  } ,&=`T 7i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 UjaC( c  
   for(int index=0;index<MAX_KEY;index++){ z aF0nov  
    if(hCallWnd[index]==NULL) "{_"Nj H  
     continue; d eoM~r9s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pJz8e&wyLM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); o0'av+e7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1l_}O1  
   } b-?o?}*  
  } ~@D%qbN  
 } fn OkH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <k](s  
} q4i8Sp>  
Wu( 8 G  
  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: kZ9< j+.  
yk<jlVF$j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -ZP&zOsDr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \bic.0-  
:XSc#H4  
  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: ib \[ ~rg  
e:LZs0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }+ 2"?f|]  
{ *\KMkx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RYl3txw  
 { NP`s[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &&1Y"dFs  
  SaveBmp(); df6&Nu;4L  
  return FALSE; (D m"e`  
 } npcBpGL{  
 …… //其它处理及默认处理 )O@^H   
} 5 ?~-Vv31s  
9c{%m4  
xd fvme[  
  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。 Cw[Od"B\?U  
qM>OE8c#/  
  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。 n,jE#Z.D  
C.eV|rc@T  
  二、编程步骤 U.Chf9a -  
N~}v:rK>g  
  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"; S~rVRC"<xo  
'%-xe3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J )8pqa   
/-{O\7-D  
  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; IEoR7:  
>\7RIy3  
  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; rfXF 01I  
~I\r1Wj;  
  5、 添加代码,编译运行程序。 :qCm71*  
M,\|V3s  
三、程序代码 VIz{}_~'s  
;8L+_YCa  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL i[ Gw 7'f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _N,KHxsG8B  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }`9fZK{. @  
#if _MSC_VER > 1000 W}R=  
#pragma once Z;Ir>^<  
#endif // _MSC_VER > 1000 p21=$?k!;  
#ifndef __AFXWIN_H__ +A'q#~yILa  
#error include 'stdafx.h' before including this file for PCH F@_Egi  
#endif 1RI#kti-"  
#include "resource.h" // main symbols K^,&ub.L)  
class CHookApp : public CWinApp Y1yXB).AH8  
{ ]O[+c*|w  
 public: A| gs Uh  
  CHookApp(); K{= r.W  
  // Overrides 'TK$ndy;7}  
  // ClassWizard generated virtual function overrides !X\sQNp  
  //{{AFX_VIRTUAL(CHookApp) np`g cj#  
 public: 5&n988g C8  
  virtual BOOL InitInstance(); 4uO @`0:x  
  virtual int ExitInstance(); 1%SJ1oY  
  //}}AFX_VIRTUAL %;=IMMK  
  //{{AFX_MSG(CHookApp) pu2wEQ  
  // NOTE - the ClassWizard will add and remove member functions here. , `[Z`SUk`  
  // DO NOT EDIT what you see in these blocks of generated code ! 8g# c%eZ  
  //}}AFX_MSG >%n8W>^^4  
  DECLARE_MESSAGE_MAP() qXP1Q3  
}; /^z/]!JG:V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  r21?c|IP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D% v:PYf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }{#;;5KrB  
BOOL InitHotkey(); fR]p+\#8u*  
BOOL UnInit(); `eMrP`  
#endif b[{m>Fa+o#  
/@9-!cL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jo7fxWO_g  
#include "stdafx.h" "%.|n|  
#include "hook.h" z`86-Ov  
#include <windowsx.h> RQj`9F  
#ifdef _DEBUG =1{H Sf  
#define new DEBUG_NEW eHVdZ'%x  
#undef THIS_FILE 3i]"#wK  
static char THIS_FILE[] = __FILE__; <O,'5+zG%  
#endif VL_)]LR*)  
#define MAX_KEY 100 4cXAT9  
#define CTRLBIT 0x04 dxzvPgi?  
#define ALTBIT 0x02 di]$dl|Wi  
#define SHIFTBIT 0x01 SE-!|WR  
#pragma data_seg("shareddata") bGGeg%7  
HHOOK hHook =NULL; ql!5m\  
UINT nHookCount =0; '\ph`Run  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @K,2mhE~h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nu4Pc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zVp[YOS&c  
static int KeyCount =0; o-\ok|,)#j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 8eOl@}bV  
#pragma data_seg() 2k.S[?)  
HINSTANCE hins; L"""\5Bn(  
void VerifyWindow(); >QYh}Z- /%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uuI3NAi~  
//{{AFX_MSG_MAP(CHookApp) 7j@^+rkr3f  
// NOTE - the ClassWizard will add and remove mapping macros here. (A7T}znG  
// DO NOT EDIT what you see in these blocks of generated code! u~#%P&3 _W  
//}}AFX_MSG_MAP v t^r1j  
END_MESSAGE_MAP() :@:g*w2K  
sl~b\j  
CHookApp::CHookApp() H "Q(2I  
{ xT{TVHdU  
 // TODO: add construction code here, }U2[?  
 // Place all significant initialization in InitInstance euRCBzc  
} TZ^{pvBy  
1k!D0f3qb  
CHookApp theApp; MB}:GY?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >=4sPF)  
{ "F&Tnhh4  
 BOOL bProcessed=FALSE; Ro$j1Aw(  
 if(HC_ACTION==nCode) EwTS!gL  
 { Q<z)q<e  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,)Yao;Cvd  
   switch(wParam) y' 2<qj  
   { vad|Rpl  
    case VK_MENU: ; qO@A1Hq  
     MaskBits&=~ALTBIT; S|l&fb n  
     break; g;$E1U=R-E  
    case VK_CONTROL: f&K}IM8& #  
     MaskBits&=~CTRLBIT; 7^c2e*S  
     break; aZ8h[#]7  
    case VK_SHIFT: w(aUEWYL  
     MaskBits&=~SHIFTBIT; 6!*K/2:O  
     break; %(fL?  
    default: //judge the key and send message %wOOzp`  
     break; !>\9t9  
   } {PL,VY)Z  
   for(int index=0;index<MAX_KEY;index++){ N[>:@h  
    if(hCallWnd[index]==NULL) 3 Q@9S  
     continue; wyp{KIV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TV<Aj"xw  
    { KUbJe)}g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #U\$@4D  
     bProcessed=TRUE; ,bxz]S1W  
    } 6!@0VI&P  
   } !5NGlqEF#  
  } `Rrr>vj  
  else if((lParam&0xc000ffff)==1){ //Key down ma3Qi/  
   switch(wParam) #sL/y  
   { Tu==49  
    case VK_MENU: S=4R5igrC  
     MaskBits|=ALTBIT; ,dOMW+{  
     break; T{ok +$w2  
    case VK_CONTROL: 4yhcK&  
     MaskBits|=CTRLBIT; <8$Md4r  
     break; @?m+Z"o|z  
    case VK_SHIFT: Ohc^d"[7  
     MaskBits|=SHIFTBIT; Q Qi@>v|d  
     break;  70{RDj6{  
    default: //judge the key and send message :u AjV  
     break; M' YJ"  
   } ,eDu$8J9  
   for(int index=0;index<MAX_KEY;index++) *g*VCO  
   { u9BjgK(M  
    if(hCallWnd[index]==NULL) :fhB*SYK  
     continue; Q@3B{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !h?=Wv ==]  
    { ("b*? : B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'g2vX&=$A  
     bProcessed=TRUE; z1#oW f{*  
    } f*v1J<1#  
   } @bE~@4mOu  
  } mLQUcYfR  
  if(!bProcessed){ URLk9PI  
   for(int index=0;index<MAX_KEY;index++){ 3Mur*tj#  
    if(hCallWnd[index]==NULL) f'i6QMk\&  
     continue; i]dz}=j'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;c$@@ l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j"i#R1T  
   } :1*zr  
  } ]r!QmWw~V  
 } q P'[&h5Y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2Sjt=LOc="  
} ZzT&$J7]`{  
ldYeX+J _  
BOOL InitHotkey() r 3|4gG  
{ YroNpu]s  
 if(hHook!=NULL){ g1ytT%]  
  nHookCount++; VE*j*U j  
  return TRUE; IyOpju)?  
 } aTG[=)x L  
 else #>XeR>T  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %2}C'MqS  
  if(hHook!=NULL) bb}?h]a   
   nHookCount++; =tnTdp0F  
  return (hHook!=NULL); Ww=O=c5uOu  
} e$ 32  
BOOL UnInit() =!<^^6LZ  
{ &>g~-s  
 if(nHookCount>1){ 8<{;=m8cQ  
  nHookCount--; Y+@g~TE  
  return TRUE; Li]k7w?H  
 } Gnk|^i;t  
 BOOL unhooked = UnhookWindowsHookEx(hHook); (_ U^  
 if(unhooked==TRUE){ ,z G(u 1  
  nHookCount=0; OT;cfkf7  
  hHook=NULL; M!#AfIyB  
 } @iRO7 6m  
 return unhooked; A4 5m)wQ  
} # ) `\!)?  
St2Q7K5s{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `R0Y+#$8h  
{ 5j`v`[B;  
 BOOL bAdded=FALSE; R:f7LRF/\  
 for(int index=0;index<MAX_KEY;index++){ f1J %]g!  
  if(hCallWnd[index]==0){ {@45?L('  
   hCallWnd[index]=hWnd; 5 < GDW=  
   HotKey[index]=cKey; jq[x DwPG  
   HotKeyMask[index]=cMask; B4^`Sw  
   bAdded=TRUE; F"[3c6yF  
   KeyCount++; kW +G1|  
   break; :3 y_mf>  
  } nj  
 } a,cC!   
 return bAdded; wV:C<Mg7q  
} )88nMH-  
A9;0y jae  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;'^, ,{  
{ sf)W~Lx 5a  
 BOOL bRemoved=FALSE; tr=@+WHp  
 for(int index=0;index<MAX_KEY;index++){ a_{6Qdl  
  if(hCallWnd[index]==hWnd){ s:b" \7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n_9x"m$  
    hCallWnd[index]=NULL; s!de2z  
    HotKey[index]=0; sOz sY7z3Z  
    HotKeyMask[index]=0; ) Fx ?%  
    bRemoved=TRUE; ZF'HM@cfo  
    KeyCount--; 11{y}J  
    break; >)3VbO  
   } o|rzN\WJn  
  } *Ru2:}?MpS  
 }  CC#C  
 return bRemoved; !=[>r'+3  
} J*K<FFp3<  
rN#\AN  
void VerifyWindow() mgcN(n1  
{ Vhph`[dC{  
 for(int i=0;i<MAX_KEY;i++){ $20s]ywS  
  if(hCallWnd!=NULL){ EY$?^iS  
   if(!IsWindow(hCallWnd)){ LM6]kll  
    hCallWnd=NULL; >3P9 i ;W  
    HotKey=0; RUX8qT(Z  
    HotKeyMask=0; VYigxhP7  
    KeyCount--; {:)vwUe{  
   } s.rT]  
  } Ay%:@j(E  
 }  Q; 20T  
} yoU2AMH2D^  
c[:Wf<% |  
BOOL CHookApp::InitInstance() !g2a|g   
{ =YHt9fb$c  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); uP6-cs  
 hins=AfxGetInstanceHandle(); T V;BNCg  
 InitHotkey(); )eq}MaW+j  
 return CWinApp::InitInstance(); 85hQk+Bu4  
} ~p.%.b;~t  
(: OHyeNt  
int CHookApp::ExitInstance() qiU5{}  
{ VA2<r(y~(  
 VerifyWindow(); QnU0"_-  
 UnInit(); :H\&2/j  
 return CWinApp::ExitInstance(); $T/#1w P  
} [-58Ezyr  
u-39r^`5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SSQT;>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $3 vhddO  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 045\i[l=  
#if _MSC_VER > 1000 !-RwB@\  
#pragma once zAI|Jv @  
#endif // _MSC_VER > 1000 oZ-FF'  
8 }z3CuM  
class CCaptureDlg : public CDialog `M)E*G  
{ 6l[G1KkV  
 // Construction xE1rxPuq)d  
 public: c _mq  
  BOOL bTray; ^K.*.|  
  BOOL bRegistered; /x/4NeD  
  BOOL RegisterHotkey(); 6Hn)pD#U  
  UCHAR cKey; n$ dw<y  
  UCHAR cMask; 6V P)$h8  
  void DeleteIcon(); h>|u:]I>  
  void AddIcon(); r w\D>} \  
  UINT nCount; [ro t  
  void SaveBmp(); _NT[ ~M_Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor RM#fX^)=  
  // Dialog Data Of#K:`1@  
  //{{AFX_DATA(CCaptureDlg) $l#{_~ "m7  
  enum { IDD = IDD_CAPTURE_DIALOG }; VWD.J  
  CComboBox m_Key; GmAj</~  
  BOOL m_bControl; 5v3RVaqZ  
  BOOL m_bAlt; wibwyzo  
  BOOL m_bShift; QXB|!'  
  CString m_Path; ZMe}M!V  
  CString m_Number; v~aLTI  
  //}}AFX_DATA Th/{x h  
  // ClassWizard generated virtual function overrides (JU_8j!  
  //{{AFX_VIRTUAL(CCaptureDlg) U$%|0@`~  
 public: f,JX"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !3 ?yG  
 protected: q- H&5K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X?R |x[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); . v\PilF  
  //}}AFX_VIRTUAL `{<JC{yc?  
  // Implementation L:i+}F;M)s  
 protected: t*s!0 'Y  
  HICON m_hIcon; 19) !$Hl  
  // Generated message map functions VAg68 EbnF  
  //{{AFX_MSG(CCaptureDlg) `$M etQ  
  virtual BOOL OnInitDialog(); WDvV LU`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 8 #Fh>  
  afx_msg void OnPaint(); h&P {p _Y  
  afx_msg HCURSOR OnQueryDragIcon(); Gn[*?=Vy  
  virtual void OnCancel(); "5h_8k~sQ  
  afx_msg void OnAbout(); Y6a$gXRT  
  afx_msg void OnBrowse(); I^@.Aw t  
  afx_msg void OnChange(); s6IP;}  
 //}}AFX_MSG LC76Qi;|k  
 DECLARE_MESSAGE_MAP() 7g8B'ex J  
}; Bqp&2zg)@  
#endif boIVU`F-!  
C6CGj8G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {n6\g]p3  
#include "stdafx.h" K]9tc)  
#include "Capture.h" E::<; 9  
#include "CaptureDlg.h" &62` Wr0C  
#include <windowsx.h> dhs#D:/{9  
#pragma comment(lib,"hook.lib") {vjq y&?y  
#ifdef _DEBUG .1Vu-@  
#define new DEBUG_NEW 6Z$b?A3zM  
#undef THIS_FILE y6bjJ}  
static char THIS_FILE[] = __FILE__; C5cFw/',  
#endif b6]e4DL:R  
#define IDM_SHELL WM_USER+1 {;\%!I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3JTU^-S<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V!\n3i?i  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; q;KshpfRMD  
class CAboutDlg : public CDialog '8L(f w{k  
{ *TJ<  
 public: +A&EKk%$ |  
  CAboutDlg(); 7G?Ia%u  
  // Dialog Data $+iu\MuX  
  //{{AFX_DATA(CAboutDlg) gW/QFZjY  
  enum { IDD = IDD_ABOUTBOX }; v]l&dgoT  
  //}}AFX_DATA G[y&`Qc)G  
  // ClassWizard generated virtual function overrides S[ws0Y60  
  //{{AFX_VIRTUAL(CAboutDlg) </8be=e7p  
 protected:  xh=FkY&d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >aX:gN  
  //}}AFX_VIRTUAL vR<fdV  
  // Implementation wVlSjk  
 protected: =%:JjgKc*t  
  //{{AFX_MSG(CAboutDlg) :v|r=#OI  
  //}}AFX_MSG Jii?r*"d  
  DECLARE_MESSAGE_MAP() ScM} m  
}; {hlT` K  
X}_QZO=z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #rqyy0k0'h  
{ mjWp8i  
 //{{AFX_DATA_INIT(CAboutDlg) [_B+DD=}  
 //}}AFX_DATA_INIT &C CHxjsKR  
} XfD z #  
\=HfO?$ Ro  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ^yzo!`)fso  
{ 3s88#_eT  
 CDialog::DoDataExchange(pDX); wghFGHgw  
 //{{AFX_DATA_MAP(CAboutDlg) 6R3"L]J  
 //}}AFX_DATA_MAP # |[`1  
} O('i*o4!}  
?CcR 7l  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) zav*  
 //{{AFX_MSG_MAP(CAboutDlg) HV#?6,U}  
 // No message handlers ;m2"cL>{l  
 //}}AFX_MSG_MAP V{7lltu  
END_MESSAGE_MAP() +9=@E  
;EE{ ~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]6?c8/M  
: CDialog(CCaptureDlg::IDD, pParent) =woqHTR  
{ eG[umv.9b  
 //{{AFX_DATA_INIT(CCaptureDlg) . }-@;:yh  
  m_bControl = FALSE; es*_Oo1  
  m_bAlt = FALSE; 4iL.4Uj{N  
  m_bShift = FALSE; ^`hI00u(  
  m_Path = _T("c:\\"); GlV-}5W  
  m_Number = _T("0 picture captured."); Up1$xLSl  
  nCount=0; #XYLVee,  
  bRegistered=FALSE; `-9*@_ -=M  
  bTray=FALSE; $_ I%1  
 //}}AFX_DATA_INIT {Q#Fen ;y|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 32)&;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &K}(A{  
} Fw_bY/WN{  
Aoy1<8WP%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l1iF}>F2  
{ #h #mOJ5  
 CDialog::DoDataExchange(pDX); dwf #~7h_  
 //{{AFX_DATA_MAP(CCaptureDlg) H( DVVHx  
  DDX_Control(pDX, IDC_KEY, m_Key); F] dd>#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); dl3LDB  
  DDX_Check(pDX, IDC_ALT, m_bAlt); edImrm1f  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L(!!7B_,  
  DDX_Text(pDX, IDC_PATH, m_Path); j4 &  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #P,[fgNy  
 //}}AFX_DATA_MAP y9re17{ X  
} wr;|\<c  
ixI5Xd<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9-Nq[i"  
//{{AFX_MSG_MAP(CCaptureDlg) JK'_P}[]I  
 ON_WM_SYSCOMMAND() tr9_bl&z  
 ON_WM_PAINT() wYcz\uV  
 ON_WM_QUERYDRAGICON() i1_>>49*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D0E"YEo\nv  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]`i@~Z h\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }5Tyzi(  
//}}AFX_MSG_MAP a@a1TpLQ  
END_MESSAGE_MAP() {p lmFV  
-R8!"~o  
BOOL CCaptureDlg::OnInitDialog() ]Buk9LTe  
{ $M3A+6["H  
 CDialog::OnInitDialog(); uB#B\i  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T~ q'y~9o  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5, "^"*@<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); J ]l@ r  
 if (pSysMenu != NULL)  ~bWWu`h  
 { \q d)l  
  CString strAboutMenu; Tdmo'"m8z_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); XL&eJ  
  if (!strAboutMenu.IsEmpty()) +n.j.JP"X  
  { VL!kX``^F  
   pSysMenu->AppendMenu(MF_SEPARATOR); U%PMV?L{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8wx#,Xa  
  } H1ui#5n2  
 } d# ?* 62  
 SetIcon(m_hIcon, TRUE); // Set big icon *y\tnsU  
 SetIcon(m_hIcon, FALSE); // Set small icon JjO/u>A3;7  
 m_Key.SetCurSel(0); @Q1F#IU  
 RegisterHotkey(); $O</akn;  
 CMenu* pMenu=GetSystemMenu(FALSE); fjZveH0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zvs 2j"lb  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wb Tg  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y7G|P~td  
 return TRUE; // return TRUE unless you set the focus to a control ]O(HZD%  
} S?z j&X Y3  
q@"4Rbu6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `kT$Gx4x  
{ 90(oV&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _<~Vxz9  
 { =<W[dV=W  
  CAboutDlg dlgAbout; hB<z]sl  
  dlgAbout.DoModal(); C00*X[p  
 } kC#B7*[RM  
 else Ex&RR< 5  
 { *Lk&@(  
  CDialog::OnSysCommand(nID, lParam); ~)CU m[:oM  
 } Nn4Kt,KY  
} !I+u/f?TO7  
] 8cX#N,M  
void CCaptureDlg::OnPaint() +CHO0n  
{ F-OZIo  
 if (IsIconic()) P>,D$-3  
 { 4a-F4j'  
  CPaintDC dc(this); // device context for painting s?I=}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =&G|} M  
  // Center icon in client rectangle 7Sv5fLu2  
  int cxIcon = GetSystemMetrics(SM_CXICON); @3= < wz<  
  int cyIcon = GetSystemMetrics(SM_CYICON); c+M@{EbuN  
  CRect rect; J0)WRn"h  
  GetClientRect(&rect); S gsR;)2  
  int x = (rect.Width() - cxIcon + 1) / 2; =,;3z/k%  
  int y = (rect.Height() - cyIcon + 1) / 2; `2~Ea_Z  
  // Draw the icon X OtS+p  
  dc.DrawIcon(x, y, m_hIcon); aj-uk(r  
 } v+2q R0,LM  
 else Oes+na'^  
 { N P(?[W  
  CDialog::OnPaint(); }z 2-|"H  
 } MZF ;k$R  
} \z?;6A  
O6 J<Lqgh  
HCURSOR CCaptureDlg::OnQueryDragIcon() }Nc!8'@  
{ .Zz7LG{  
 return (HCURSOR) m_hIcon; ^[NmNi*  
} "_}D{ws1  
WC&Ltw8  
void CCaptureDlg::OnCancel() e ^& 8x  
{ g}j>;T  
 if(bTray) DL Q`<aU  
  DeleteIcon(); X)+sHcE~#  
  CDialog::OnCancel(); vPq\reKe  
} W@}5e-q)O  
H;te)km}  
void CCaptureDlg::OnAbout() z4UQ:z@  
{ vu \Dx9  
 CAboutDlg dlg; @g2L=XF  
 dlg.DoModal();  } R6h  
} 9r*T3=u.S  
a8U2c;  
void CCaptureDlg::OnBrowse() F!t13%yeu?  
{ ~ ?_Z!eS  
 CString str; t$5]1dY$X  
 BROWSEINFO bi; U,(+rMeY0  
 char name[MAX_PATH]; X~4:sJ\P=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |hyr(7  
 bi.hwndOwner=GetSafeHwnd(); v0J1%{/xs  
 bi.pszDisplayName=name; _$lQK{@rY  
 bi.lpszTitle="Select folder"; by[(9+/z$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  ?wY.B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2DQC)Pe+z  
 if(idl==NULL) (3*Hl  
  return; >k-poBw  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :Djp\ e6!  
 str.ReleaseBuffer(); SSC!BcC1  
 m_Path=str; MUl+Oy>  
 if(str.GetAt(str.GetLength()-1)!='\\') aN3{\^  
  m_Path+="\\"; {q4"x5|  
 UpdateData(FALSE); &zy9}4w,  
} j!H?dnE||  
0g)mf6}o  
void CCaptureDlg::SaveBmp() g?M69~G$:x  
{ r!uAofIi_  
 CDC dc; &|;!St]!M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); GTe9@d  
 CBitmap bm; bV,R*C  
 int Width=GetSystemMetrics(SM_CXSCREEN); @/iLC6QF  
 int Height=GetSystemMetrics(SM_CYSCREEN); \2b9A' d>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ut=y`]F  
 CDC tdc; a{,t@G  
 tdc.CreateCompatibleDC(&dc); @jeV[N,0  
 CBitmap*pOld=tdc.SelectObject(&bm); o(qmI/h  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "j>0A Hem  
 tdc.SelectObject(pOld); \H(,'w7H  
 BITMAP btm; +[DVD  
 bm.GetBitmap(&btm); gk` .8o  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s1q d/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S22; g  
 BITMAPINFOHEADER bih; uIwyan-  
 bih.biBitCount=btm.bmBitsPixel; lEs/_f3;A  
 bih.biClrImportant=0; 3!x)LUWfWY  
 bih.biClrUsed=0; )9->]U@  
 bih.biCompression=0; 8hT>)WH}wo  
 bih.biHeight=btm.bmHeight; ?H?r!MZ%  
 bih.biPlanes=1; oPir]` re  
 bih.biSize=sizeof(BITMAPINFOHEADER); w{IqzmPiH  
 bih.biSizeImage=size; -nSqB{s!SD  
 bih.biWidth=btm.bmWidth; >6 q@Tr  
 bih.biXPelsPerMeter=0; j>23QPG`6U  
 bih.biYPelsPerMeter=0; "bH ~CG:Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q<7n5kJ~  
 static int filecount=0; 2{N0.  |5  
 CString name; v~3q4P  
 name.Format("pict%04d.bmp",filecount++); us+adS.l&  
 name=m_Path+name; X}Fv*  
 BITMAPFILEHEADER bfh; V ZGhF!To  
 bfh.bfReserved1=bfh.bfReserved2=0; 3 Gkw.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bcfOp A  
 bfh.bfSize=54+size; ]CYe=m1<2Q  
 bfh.bfOffBits=54; Y._AzJ&B[  
 CFile bf; 70~]J8T+u  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ na)_8r~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <^paRKEa+#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {HeMdGn9  
  bf.WriteHuge(lpData,size); kOO2 ?L|Z  
  bf.Close(); "'L SLp  
  nCount++; zx*f*L,6F  
 } ?1sY S  
 GlobalFreePtr(lpData); [R$4n-$  
 if(nCount==1) fBmx +7  
  m_Number.Format("%d picture captured.",nCount); #s%$kYp 1  
 else QWEK;kUa@  
  m_Number.Format("%d pictures captured.",nCount); |zE7W  
  UpdateData(FALSE); Pmb`05\  
} S"l&=J2dc  
teb(\% ,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >qla,}x  
{ dXhV]xK  
 if(pMsg -> message == WM_KEYDOWN) aHw VoT  
 { KAZz) 7  
  if(pMsg -> wParam == VK_ESCAPE) <U*d   
   return TRUE; 8z&9  
  if(pMsg -> wParam == VK_RETURN) s0SB!-Vjm  
   return TRUE; A6VkVJZx  
 } >e%Po,Fg$  
 return CDialog::PreTranslateMessage(pMsg); <V{BRRx  
} QHK$  
YeVhWPn@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) joq ;N]S  
{ k?,g:[4!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ aU @z\sQ  
  SaveBmp(); 9w1)Mf}  
  return FALSE; 9]iDNa/D  
} $8)/4P?OL  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :([,vO:  
 CMenu pop; U,N4+F}FR  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4p]Y`];U  
 CMenu*pMenu=pop.GetSubMenu(0); 5"+* c@L  
 pMenu->SetDefaultItem(ID_EXITICON); 6tM{cK%v1  
 CPoint pt; +e\u4k{3V  
 GetCursorPos(&pt); 8eNGPuoL)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h!.(7qdd  
 if(id==ID_EXITICON) {|cA[#j#  
  DeleteIcon(); Tn|re Xc0e  
 else if(id==ID_EXIT) v|e>zm <  
  OnCancel(); !**q20-aP  
 return FALSE; tB[K4GNSQ  
} R)v`ZF,/b  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8cHZBM7'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) iZ UBw  
 AddIcon(); Y:wds=lA  
 return res; a[/p(O  
} pw,.*N3P  
(/^&3xs9  
void CCaptureDlg::AddIcon()  F#hM S<  
{ C/XOI >  
 NOTIFYICONDATA data; pT <H&  
 data.cbSize=sizeof(NOTIFYICONDATA); <NUZPX29  
 CString tip; cWi2Sls  
 tip.LoadString(IDS_ICONTIP); mEA w^  
 data.hIcon=GetIcon(0); uQDu<@5^[  
 data.hWnd=GetSafeHwnd(); }v:h EMO  
 strcpy(data.szTip,tip); uBM1;9h  
 data.uCallbackMessage=IDM_SHELL; wG B'c's*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WrV|<%EQh  
 data.uID=98; )S]c'}^  
 Shell_NotifyIcon(NIM_ADD,&data); XH/|jE.9^|  
 ShowWindow(SW_HIDE); tC;D4i  
 bTray=TRUE; |D\ ukml  
} ,?}TSJKC  
:c\NBKHv*  
void CCaptureDlg::DeleteIcon() ',.Xn`c  
{ `bi5#xR  
 NOTIFYICONDATA data; GRNH!:e  
 data.cbSize=sizeof(NOTIFYICONDATA); yfU1;MI  
 data.hWnd=GetSafeHwnd(); ?lTQjw{  
 data.uID=98; U|>Js!$  
 Shell_NotifyIcon(NIM_DELETE,&data); a P`;Nr=  
 ShowWindow(SW_SHOW); !U91  
 SetForegroundWindow(); OSBE5  
 ShowWindow(SW_SHOWNORMAL); hk~ s1"  
 bTray=FALSE; {*: C$"L  
} )TxhJB5|  
KS%,N _F<  
void CCaptureDlg::OnChange() 3TJNlS  
{ ^t| %!r G  
 RegisterHotkey(); cD 1p5U  
} $HaM, Oh;i  
 z\ \MLyS  
BOOL CCaptureDlg::RegisterHotkey() b_B4  
{ L U7.  
 UpdateData(); (* p |Kzu  
 UCHAR mask=0; qU}[( 9~Ru  
 UCHAR key=0; ;;2s{{(R  
 if(m_bControl) <|{=O9  
  mask|=4; P\Ka'i  
 if(m_bAlt) Mqna0"IYx*  
  mask|=2; 'rSM6j  
 if(m_bShift) J[^-k!9M  
  mask|=1; vnKUD|  
  key=Key_Table[m_Key.GetCurSel()]; (h E^<jNR  
 if(bRegistered){ v"^G9u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [[Z*n/tr  
  bRegistered=FALSE; $+Xohtt  
 } :/u EPki  
 cMask=mask; rT x]%{  
 cKey=key; m49)cK?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7{p,<Uz<"U  
 return bRegistered; + 5 05  
} G-Y8<mEh  
Baq&>]  
  四、小结 s01n[jQ  
x]F:~(P  
  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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