社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5030阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: m!-,K8  
  406.6jmv  
  一、实现方法 _U`_;=(  
1"Z61gXrz  
  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: #YMU}4=:  
N6BFs(  
#pragma data_seg("shareddata") | D jgm7$*  
HHOOK hHook =NULL; //钩子句柄 Kqt,sJ  
UINT nHookCount =0; //挂接的程序数目 :b_R1ZV|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KvrcO#-sL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^SouA[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1Goju ey  
static int KeyCount =0; y-iuOzq4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \y G//  
#pragma data_seg() HFL(t]  
w Kq-|yf,  
  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。 _XqD3?yH4  
)Ekp <2B:0  
  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: AW+ q#Is  
+EWfsKz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR aT %A<'O!  
cKey,UCHAR cMask) loLN ~6  
{ L[Dr[  
 BOOL bAdded=FALSE; Ws;}D}+  
 for(int index=0;index<MAX_KEY;index++){ aQK>q. t  
  if(hCallWnd[index]==0){ )`ZTu -|  
   hCallWnd[index]=hWnd; jHxg(]  
   HotKey[index]=cKey; qd FYf/y  
   HotKeyMask[index]=cMask; P7Ws$7x  
   bAdded=TRUE; fQ^45ulz  
   KeyCount++; k2xOu9ncEj  
   break; 8W|qm;J98  
  } |lijnfp  
 } : _>/Yd7-&  
 return bAdded; b'N(eka  
} 9cu0$P`}5  
//删除热键 4ISZyO=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5Y\wXqlY  
{ <XV\8Y+n  
 BOOL bRemoved=FALSE; d+Vx:`tT  
 for(int index=0;index<MAX_KEY;index++){ :{d?B$  
  if(hCallWnd[index]==hWnd){ nSL x1Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4$=Dq$4z  
    hCallWnd[index]=NULL; wh\J)pA1  
    HotKey[index]=0; $~V,.RD  
    HotKeyMask[index]=0; 'ju{j`b  
    bRemoved=TRUE; 0!c^pOq6  
    KeyCount--; qe!\ oh  
    break; S 'jH  
   } 0"~`U.k~M  
  } "]dNN{Wka  
 } eJB !|  
 return bRemoved; [4qx+ypT  
} ~ l'dpg  
lkWID  
(bIg6_U7\  
  DLL中的钩子函数如下: 2sJj -3J  
94umk*ib  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +@Oo)#V|.  
{ fXPD^}?Ux4  
 BOOL bProcessed=FALSE; e7<//~W7W  
 if(HC_ACTION==nCode) =U6%Wdth  
 { f*VBSg[`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g9fS|T  
   switch(wParam) `JGV3nN  
   {  2\xv Yf-  
    case VK_MENU: 3%<Uq%pJ  
     MaskBits&=~ALTBIT; L,&R0gxi  
     break; 5V5E,2+ 0  
    case VK_CONTROL: ,haCZH {  
     MaskBits&=~CTRLBIT; tH_e?6]  
     break; X`dd"8%  
    case VK_SHIFT: |=7ouFl  
     MaskBits&=~SHIFTBIT; 2l)J,z  
     break; K +oFu%  
    default: //judge the key and send message S+Aq0B<  
     break; 5YlY=J  
   } Dl kHE8r\  
   for(int index=0;index<MAX_KEY;index++){ (GVH#}uB  
    if(hCallWnd[index]==NULL) =|lKB;  
     continue; NzmVQ-4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fg3VD(D^U  
    { +UxhSFU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l:O6`2Z  
     bProcessed=TRUE; gHLBtl/  
    } vV.TK_ y  
   } [Yx)`e  
  } fI2/v<[  
  else if((lParam&0xc000ffff)==1){ //有键按下 0W|}5(C  
   switch(wParam) a}Db9=  
   { =#@eDm%  
    case VK_MENU: #Y3:~dmJ-  
     MaskBits|=ALTBIT; ,"PKGd]^  
     break; 47R4gs#W  
    case VK_CONTROL: OC|9~B1  
     MaskBits|=CTRLBIT; g0m6D:f  
     break; Th&* d;  
    case VK_SHIFT: '/^bO#G:  
     MaskBits|=SHIFTBIT; 4~Ptn/ g  
     break; =)Cqjp  
    default: //judge the key and send message ffuV158a&  
     break; PQ`p:=~>:i  
   } 7Vf2Qx1_  
   for(int index=0;index<MAX_KEY;index++){ "T/ vE  
    if(hCallWnd[index]==NULL) 289@O-  
     continue; N;XaK+_2F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lw 7,[?,Z  
    { &u62@ug#}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y$VYWcFE  
     bProcessed=TRUE; +~O 0e-d  
    } mC P*v-  
   } $2uZdl8Rvj  
  }  >:whNp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "HRoS#|\  
   for(int index=0;index<MAX_KEY;index++){ uqy b  
    if(hCallWnd[index]==NULL) M{U{iS  
     continue; J`U\3:b`SP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wN[mU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bWN%dn$$M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,EyZ2`|  
   } #rL%K3'  
  } KdT1Nb=  
 } 9o<}*L   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); sd;J(<Ofh  
} &Q>)3]|p  
GY@-}p~it  
  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: L-}>;M$Y)  
box(FjrZE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  (f DA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E|ce[|2  
60KhwD1  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Tu Q@b  
N=J$+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xjHOrr OQ  
{ ~7$E\w6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) SST1vzm!  
 { /5^"n4/M  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 k}-@N;zq  
  SaveBmp(); p@H]F<  
  return FALSE; c+PT"/3  
 } >#}MDwKZD  
 …… //其它处理及默认处理 t:tT Zh  
} =%, ;=4w  
ITj0u&H:  
c[:OK9TH  
  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。 SG1o< #>  
$dAQ'\f7  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 HC0q_%j  
aa8xo5tIp  
  二、编程步骤 gxEa?QH  
-!uut7Z|  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; YNc] x>  
P+iZ5S\kL=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 6LUO  
c}iVBN6~.<  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; yc.Vm[!  
N&`VMEB)k  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "4c ?hH:C  
Ue:'55  
  5、 添加代码,编译运行程序。 7^|oO~x6  
<3dmY=  
三、程序代码 i6R2R8  
e0O2 >w  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Z% 3]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ekx3GM_]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o]0v#2l'  
#if _MSC_VER > 1000  _6a+" p  
#pragma once l[=7<F  
#endif // _MSC_VER > 1000 ncg5%(2  
#ifndef __AFXWIN_H__ t^0^He$Ot  
#error include 'stdafx.h' before including this file for PCH e)dPv:oK3  
#endif l4+!H\2  
#include "resource.h" // main symbols NET?Ep  
class CHookApp : public CWinApp JcsJfTI  
{ (lwrk(  
 public: <rUH\z5cP  
  CHookApp(); QUL^]6$  
  // Overrides @OOnO+g  
  // ClassWizard generated virtual function overrides 7n*,L5%?]4  
  //{{AFX_VIRTUAL(CHookApp) 9-;ujl?{  
 public: R<VNbm;  
  virtual BOOL InitInstance(); -.A%c(|Q  
  virtual int ExitInstance(); P(I`^x  
  //}}AFX_VIRTUAL 'P{0K?{H-4  
  //{{AFX_MSG(CHookApp) Fw!wSzsk3  
  // NOTE - the ClassWizard will add and remove member functions here. Qmxe*@{`  
  // DO NOT EDIT what you see in these blocks of generated code ! 70,V>=aJ  
  //}}AFX_MSG Dm=t`_DL8  
  DECLARE_MESSAGE_MAP() ^|^ek  
}; :34#z.O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;seD{y7!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %4#,y(dO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rj[2XIO  
BOOL InitHotkey(); 0z) 8i P  
BOOL UnInit(); O)nLV~X  
#endif Js7(TFQE  
" , c1z\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >r%L=22+  
#include "stdafx.h" "KQ3EI/g  
#include "hook.h" dR"H,$UH  
#include <windowsx.h> 5b X*8H D  
#ifdef _DEBUG !@mV$nTA  
#define new DEBUG_NEW dkTj KV  
#undef THIS_FILE T"1H%65`V  
static char THIS_FILE[] = __FILE__; <ijf':X=*  
#endif 1@Dp<Q  
#define MAX_KEY 100 3V:{_~~  
#define CTRLBIT 0x04 ( zQ)EHRD  
#define ALTBIT 0x02 %VG;vW\V  
#define SHIFTBIT 0x01 [r'PGx  
#pragma data_seg("shareddata") Y1a[HF^-  
HHOOK hHook =NULL; ,bT|:T@ny  
UINT nHookCount =0; M,]C(f>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3R(GO.n=]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8hWB TUN  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey } DY{>D>  
static int KeyCount =0; `>CHE'_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fl| 8#\r  
#pragma data_seg() m1@ste;$W  
HINSTANCE hins; dz fR ^Gv  
void VerifyWindow(); TWF6YAQ m  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) RAMkTS  
//{{AFX_MSG_MAP(CHookApp) x)eYqH~i  
// NOTE - the ClassWizard will add and remove mapping macros here. ,KvF:xqA  
// DO NOT EDIT what you see in these blocks of generated code! Uc,D&Og  
//}}AFX_MSG_MAP 6^U8Utx  
END_MESSAGE_MAP() _DPWp,k<~  
ylm*a74-X  
CHookApp::CHookApp() i oX [g  
{ n%; wQ^  
 // TODO: add construction code here, c$?(zt ;  
 // Place all significant initialization in InitInstance tins.D  
} W- Q:G=S-  
#m_3l s}W$  
CHookApp theApp; _t<&#D~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) N ]/ N}b  
{ q$)$?"  
 BOOL bProcessed=FALSE; +We_[Re`<  
 if(HC_ACTION==nCode) 0TA{E-A   
 { D BDHe-1[+  
  if((lParam&0xc0000000)==0xc0000000){// Key up &YQ  
   switch(wParam) 40TS=evG  
   { Pw`26mB   
    case VK_MENU: O@;;GJ  
     MaskBits&=~ALTBIT; =zw=J p  
     break; ~jdvxoX-  
    case VK_CONTROL: a12Q/K  
     MaskBits&=~CTRLBIT; m0xL'g6F  
     break; 6*`KC)a  
    case VK_SHIFT: 6 &~8TH  
     MaskBits&=~SHIFTBIT; qEvHrsw},  
     break; RlH|G  
    default: //judge the key and send message *?|LE C  
     break; \]Nlka  
   } VC%{qal;q  
   for(int index=0;index<MAX_KEY;index++){ ~R7F[R  
    if(hCallWnd[index]==NULL) SMHQo/c r  
     continue; MD(?Wh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [J0f:&7\  
    { nY(>|!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F?!P7 zW  
     bProcessed=TRUE; P{ YUW~  
    } Vfkm{*t)  
   } hV5Aw;7C  
  } O <;Au|>*  
  else if((lParam&0xc000ffff)==1){ //Key down kTQ.7mo/\'  
   switch(wParam) USgZ%xk2  
   { ^0A}iJL  
    case VK_MENU: 9Q{-4yF9k  
     MaskBits|=ALTBIT; yV=Ku  
     break; p=F!)TnJN  
    case VK_CONTROL: yo\R[i(  
     MaskBits|=CTRLBIT; 7!%/vO0m  
     break; E'3=qTbiD  
    case VK_SHIFT: *v1M^grKd  
     MaskBits|=SHIFTBIT; 2aQR#lcv  
     break; B|%(0j8  
    default: //judge the key and send message ,(d\!T/]'  
     break; : utY4  
   } ?y1']GAo  
   for(int index=0;index<MAX_KEY;index++) AY]dwKw  
   { -$W#bqvz^  
    if(hCallWnd[index]==NULL) Co|3k:I 8  
     continue; 0=N,y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >eX&HSoy  
    { GM&< ?K1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HgH\2QL3&  
     bProcessed=TRUE; 4n55{ ?Z  
    } 0ws1S(pq  
   } kKbq?}W[  
  } Z>=IP-,>  
  if(!bProcessed){ 1'.SHY|  
   for(int index=0;index<MAX_KEY;index++){ +Sz%2 Q  
    if(hCallWnd[index]==NULL) t8vR9]n  
     continue; L=`QF'Im  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *nb `DR  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <2b&AF{En  
   } r6 k/QZT  
  } !O;su~7  
 } Q;9-aZ.H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C\%T|ZDE  
} tK@|sZ>3\  
"*08?KA  
BOOL InitHotkey() %6A."sePO  
{ <( "M;C3y  
 if(hHook!=NULL){ Hzm<KQ g  
  nHookCount++; ?D 8<}~Do  
  return TRUE; EPEy60Rx5  
 } Fjnp0:p9X  
 else Q]44A+M]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2x PkQOj3  
  if(hHook!=NULL) _=%F6}TE  
   nHookCount++; 'gBns  
  return (hHook!=NULL); %S$P<nKN5  
} isU7nlc!  
BOOL UnInit()  :P,g,  
{ U;SReWqU  
 if(nHookCount>1){ 0L->e(Vf7u  
  nHookCount--; 8 $5 y]%!  
  return TRUE; uD'yzR!]+  
 } .bdp=vbA  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i rjOGn  
 if(unhooked==TRUE){ Z;=h=  
  nHookCount=0; ;v#BguM  
  hHook=NULL; dO?zLc0f  
 } &xhwx>C`K  
 return unhooked; p\;\hHai  
} jl-2)<  
Whoqs_Mm{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qV;E% XkkS  
{ =sm<B^yj  
 BOOL bAdded=FALSE; X`/GiYTu  
 for(int index=0;index<MAX_KEY;index++){ @wvgMu  
  if(hCallWnd[index]==0){ aPU.fER  
   hCallWnd[index]=hWnd; >(EC.ke  
   HotKey[index]=cKey; ? <F=*eS  
   HotKeyMask[index]=cMask; a$=BX=  
   bAdded=TRUE; Ux[2 +Cf  
   KeyCount++; KjWF;VN*[3  
   break; ,=_)tX^  
  } 0H$6_YX4 A  
 } ON(OYXj  
 return bAdded; -FOn%7r#Y  
} RB\ Hl  
K#"J8h;x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uez"{_I  
{ %rFR:w`{  
 BOOL bRemoved=FALSE; x3>ZO.Q  
 for(int index=0;index<MAX_KEY;index++){ lw\+!}8(  
  if(hCallWnd[index]==hWnd){ \eF _Xk[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9f#~RY|#m  
    hCallWnd[index]=NULL; !+UU[uM  
    HotKey[index]=0; ~^{>!wU+  
    HotKeyMask[index]=0; 34*73WxK  
    bRemoved=TRUE; R"wBDWs  
    KeyCount--; ='W=  
    break; y ;/T.W9!  
   } .2Q4EbM2  
  } W)X" G3  
 } #!0=I s^  
 return bRemoved; N>TmaUk  
} Y YE{zU  
o*k.je1  
void VerifyWindow() }}Zwdpo  
{ |?cL>]t  
 for(int i=0;i<MAX_KEY;i++){ =l)D$l  
  if(hCallWnd!=NULL){ *&vlfH  
   if(!IsWindow(hCallWnd)){ 1 5heLnei  
    hCallWnd=NULL; ._E 6?  
    HotKey=0; =,B Dd$e  
    HotKeyMask=0; ^ABt g#  
    KeyCount--; >^=;b5I2K  
   } 1+F0$<e}  
  } G?M<B~}  
 } 12i<b  
} %nS(>X<B  
cv{icz,%w  
BOOL CHookApp::InitInstance() 3u 'VPF2  
{ 7"_m?c8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zb]e {$q2C  
 hins=AfxGetInstanceHandle(); ybC0Ee@  
 InitHotkey(); Aaw]=8 OI  
 return CWinApp::InitInstance(); ~hZr1hT6L  
} exZgk2[0  
2jVvK"C  
int CHookApp::ExitInstance() '^n,)oA/G  
{ 8|LU=p`y'  
 VerifyWindow(); I[6ft_*  
 UnInit(); }ed{8"bj  
 return CWinApp::ExitInstance(); {e+}jZ[L  
} lC=-1*WH  
\y(ZeNs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Zg*XbX  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2/iBk'd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .GSK!1{@  
#if _MSC_VER > 1000 [;C|WTYSL  
#pragma once y$}o{VE{x  
#endif // _MSC_VER > 1000 | |u  
b$eN]L   
class CCaptureDlg : public CDialog 2@6Qifxd@  
{ !C&  ^%a  
 // Construction ,bxGd!&{Q  
 public: h]]B @~  
  BOOL bTray; e#AmtheZR  
  BOOL bRegistered; N;HG@B!m  
  BOOL RegisterHotkey(); dw-o71(1d  
  UCHAR cKey; M9QYYo@  
  UCHAR cMask; -l~+cI\2  
  void DeleteIcon(); NI:3hfs  
  void AddIcon(); ]&?8l:3-G  
  UINT nCount; T8BewO=}  
  void SaveBmp(); /,yRn31[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m++=FsiX=  
  // Dialog Data Y<t(m$s  
  //{{AFX_DATA(CCaptureDlg) hRNnj  
  enum { IDD = IDD_CAPTURE_DIALOG }; sd _DG8V  
  CComboBox m_Key; KTE X]  
  BOOL m_bControl; V6bjVd9|Z  
  BOOL m_bAlt; )*L=$0R  
  BOOL m_bShift; O'{g{  
  CString m_Path; P#|}]oG%  
  CString m_Number; Ck:+F+7_v  
  //}}AFX_DATA _7;D0l  
  // ClassWizard generated virtual function overrides M2nWvU$  
  //{{AFX_VIRTUAL(CCaptureDlg) 489xoP  
 public: 4iv&!hAc;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); zGwM# -  
 protected: oh7tE$"c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iOtf7.@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }Oq P`B  
  //}}AFX_VIRTUAL xnDst9%  
  // Implementation 6@;sOiN+  
 protected: ,FwJ0V  
  HICON m_hIcon; HF<h-gX  
  // Generated message map functions z~th{4#E ;  
  //{{AFX_MSG(CCaptureDlg) e!ql8wbp  
  virtual BOOL OnInitDialog(); LvCX(yjZ*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v"l8[::  
  afx_msg void OnPaint(); &bigLe  
  afx_msg HCURSOR OnQueryDragIcon(); r3+   
  virtual void OnCancel(); ( e#f  
  afx_msg void OnAbout(); PDS?>Jg(  
  afx_msg void OnBrowse(); cEIs9;  
  afx_msg void OnChange(); c5Hyja=  
 //}}AFX_MSG TSH'OW !b  
 DECLARE_MESSAGE_MAP() X.V4YmZ- ;  
}; */OKg;IMi  
#endif bZ#5\L2  
6MpV ,2:>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file q8}he~a  
#include "stdafx.h" NcX`*18  
#include "Capture.h" +q%b'!&Q  
#include "CaptureDlg.h" .;)V;!  
#include <windowsx.h> IN,=v+A  
#pragma comment(lib,"hook.lib") ')TS'p,n  
#ifdef _DEBUG k#-%u,t  
#define new DEBUG_NEW /z )Nz2W  
#undef THIS_FILE Ab8Ke|fA  
static char THIS_FILE[] = __FILE__; GHO6$iM)[  
#endif 6$K@s  
#define IDM_SHELL WM_USER+1 }S;A%gYm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w3&L 6|,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :m<#\!?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |_hIl(6F5N  
class CAboutDlg : public CDialog *6G@8TIh  
{ "|BSGV!8  
 public: Hb[P|pPT  
  CAboutDlg(); T_d)1m fl  
  // Dialog Data }/4),W@<  
  //{{AFX_DATA(CAboutDlg) d(K}v\3!  
  enum { IDD = IDD_ABOUTBOX }; C%|m[,Gx  
  //}}AFX_DATA }lP`3e  
  // ClassWizard generated virtual function overrides _Nh`-R%B)  
  //{{AFX_VIRTUAL(CAboutDlg) ZcN#jnb0/  
 protected: A6 RwLX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <`u_O!h  
  //}}AFX_VIRTUAL ByacSN  
  // Implementation 6m@B.+1  
 protected: Ed+jSO0  
  //{{AFX_MSG(CAboutDlg) lx7]rkWo|a  
  //}}AFX_MSG e|q~t {=9S  
  DECLARE_MESSAGE_MAP() ornU8H`  
}; (mioKO )?v  
/iL*)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6Fc*&7Z+  
{ wG73GD38  
 //{{AFX_DATA_INIT(CAboutDlg) agq4Zy  
 //}}AFX_DATA_INIT {B4.G8%Z  
} ^v+p@k  
czsnPmNEI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r5y*SoD!  
{ D=SjCmG  
 CDialog::DoDataExchange(pDX); 5?0~7^de  
 //{{AFX_DATA_MAP(CAboutDlg) Pj_*,L`mZ  
 //}}AFX_DATA_MAP {q^UWv?1  
} 4(,M&NC  
xW7[VTXc^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [c XSk  
 //{{AFX_MSG_MAP(CAboutDlg) \uO^w J}  
 // No message handlers e-%q!F(Bf  
 //}}AFX_MSG_MAP vOq N=bp  
END_MESSAGE_MAP() F,V| In  
z6P~HF+&h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *m2?fP\  
: CDialog(CCaptureDlg::IDD, pParent) 3"sXN)j  
{ FF;Fo}no-  
 //{{AFX_DATA_INIT(CCaptureDlg) '<>?gE0Cd  
  m_bControl = FALSE; ;/H/Gn+  
  m_bAlt = FALSE; Xpt9$=d  
  m_bShift = FALSE; Xc4zUEO9  
  m_Path = _T("c:\\"); <+<Nsza  
  m_Number = _T("0 picture captured."); /(?s\}O  
  nCount=0; R\<d&+q@  
  bRegistered=FALSE; XM#nb$gl  
  bTray=FALSE; ]^Xj!01~  
 //}}AFX_DATA_INIT T=RabKVYP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qFl|q0\ A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);  M%g2UP  
} X3~` ~J  
'rq@9$h1W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !,C8  
{ xdVsbW)L2  
 CDialog::DoDataExchange(pDX); xo2j fz  
 //{{AFX_DATA_MAP(CCaptureDlg) i5|)|x3  
  DDX_Control(pDX, IDC_KEY, m_Key); :i|]iXEI"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  y(#6nG@S  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o' v!83$L  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); yivWT;`  
  DDX_Text(pDX, IDC_PATH, m_Path); ~SmFDg$/m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); y0p\Gu;3j  
 //}}AFX_DATA_MAP a!f71k r  
} %xKZ" #Z#K  
.gM6m8l9wp  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7u rD  
//{{AFX_MSG_MAP(CCaptureDlg) c&Eva  
 ON_WM_SYSCOMMAND() D;*cy<_K8  
 ON_WM_PAINT() c`/=)IO4%  
 ON_WM_QUERYDRAGICON() rHuzGSX54  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  d^zuo  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q- w_ @~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /`0>U  
//}}AFX_MSG_MAP >UV}^OO  
END_MESSAGE_MAP() RS#C4NG  
3sW!ya-VZ  
BOOL CCaptureDlg::OnInitDialog() bnPhhsR  
{ Vol}wc  
 CDialog::OnInitDialog(); Wc,`L$Jx  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _xy[\X;9  
 ASSERT(IDM_ABOUTBOX < 0xF000); "rfBYl`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <;uM/vS i  
 if (pSysMenu != NULL) ?b"'w  
 { A-J#$B  
  CString strAboutMenu; OJhMM-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )."dqq^ q  
  if (!strAboutMenu.IsEmpty()) LOr(HgyC  
  { BR_fOIDc  
   pSysMenu->AppendMenu(MF_SEPARATOR); TQPrOs?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %;|dEY  
  } Qc=-M'9  
 } $~VIx% h  
 SetIcon(m_hIcon, TRUE); // Set big icon TuaP  
 SetIcon(m_hIcon, FALSE); // Set small icon z`NJelcuz\  
 m_Key.SetCurSel(0); Z3=N= xY]  
 RegisterHotkey(); V-E 77u6{0  
 CMenu* pMenu=GetSystemMenu(FALSE); S <-5<Pg  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jc\y{I\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xbrc_ V\_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Pjxj$>&;*j  
 return TRUE; // return TRUE unless you set the focus to a control JT~Dr KI_  
} F,Ve,7kh  
2+b}FVOe\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tR2%oT>h  
{ l;&kX6 w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gvD*^  
 { TP~1-(M)}  
  CAboutDlg dlgAbout; h%NM%;"H/  
  dlgAbout.DoModal(); g \ou+M#  
 } q~Al[`K  
 else 2$`Y 4b3t  
 { qJ<l$Ig  
  CDialog::OnSysCommand(nID, lParam); 2@@evQ  
 } I6gduvkXi4  
} -yTIv* y  
]!N=Z }LD  
void CCaptureDlg::OnPaint() tkkh<5{C   
{ 8j :=D!S  
 if (IsIconic()) ]0[ot$Da6  
 { k#7A@Vb  
  CPaintDC dc(this); // device context for painting ^".6~{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @8+v6z  
  // Center icon in client rectangle K5t.OAA:  
  int cxIcon = GetSystemMetrics(SM_CXICON); lV$#>2Hh5  
  int cyIcon = GetSystemMetrics(SM_CYICON); y~\uS  
  CRect rect; LR\8M(rtvH  
  GetClientRect(&rect); $$< I}eMd>  
  int x = (rect.Width() - cxIcon + 1) / 2; 5h Dy62PRr  
  int y = (rect.Height() - cyIcon + 1) / 2; >,I'S2_Zl  
  // Draw the icon m~fDDQs  
  dc.DrawIcon(x, y, m_hIcon); +Z86Qz_  
 } }$r]\v  
 else eT]*c?"  
 { i}i >ho-8  
  CDialog::OnPaint(); ^U96p0H"T  
 } *[BtW5 6-  
} Yx,7e(AI`  
U~t!   
HCURSOR CCaptureDlg::OnQueryDragIcon() mZmEE2h  
{ %6m' |(-  
 return (HCURSOR) m_hIcon; }UQ,B  
} F- u"zox  
1oQbV`P  
void CCaptureDlg::OnCancel() IiE^HgM  
{ t~nW&]E  
 if(bTray) -mmQ]'.0  
  DeleteIcon(); &GvSgdttv  
  CDialog::OnCancel(); v\qyDZVV  
} p~""1m01,D  
m_BpY9c]5  
void CCaptureDlg::OnAbout() }[MkJ21!  
{ %}Y&qT?  
 CAboutDlg dlg; 1uR@ZK  
 dlg.DoModal(); 6d2e WS  
} 8 Gy*BpmJn  
jG)66E*"  
void CCaptureDlg::OnBrowse() lN{>.q@V`r  
{ 8Q{9AoQ3'  
 CString str; ^Jdg%U?  
 BROWSEINFO bi; B,%KvL&xMX  
 char name[MAX_PATH]; ~ b66 ;  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  cz>)6#&O  
 bi.hwndOwner=GetSafeHwnd(); 1/qD5 *`Y  
 bi.pszDisplayName=name; =MD)F  
 bi.lpszTitle="Select folder"; 6Yt3Oq<U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9F6dKPN:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )1R[X!KQ7  
 if(idl==NULL) ;:ZD<'+N  
  return; z7)$m0',?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :,R>e}lM  
 str.ReleaseBuffer(); fQg^^ZXe"  
 m_Path=str; zxx9)I@?A  
 if(str.GetAt(str.GetLength()-1)!='\\') 9f5~hBlo  
  m_Path+="\\"; 1&7?f  
 UpdateData(FALSE); O:RN4/17  
} ) =x4+)9  
589fr"Ma,6  
void CCaptureDlg::SaveBmp() j \d)#+;  
{ Zy:q)'D=  
 CDC dc; K V?+9qa,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); TL7qOA7^X  
 CBitmap bm; h^`@%g9 S  
 int Width=GetSystemMetrics(SM_CXSCREEN); MBKF8b'k  
 int Height=GetSystemMetrics(SM_CYSCREEN); kApDD[ N  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8oRq3"  
 CDC tdc; P c5C*{C  
 tdc.CreateCompatibleDC(&dc); |E||e10wR  
 CBitmap*pOld=tdc.SelectObject(&bm); uGW#z_{(n  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B> \q!dX3  
 tdc.SelectObject(pOld); 0oBAJP  
 BITMAP btm; 0]]OE+9<c  
 bm.GetBitmap(&btm); [eTEK W]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o8%o68py  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); MTgf.  
 BITMAPINFOHEADER bih; [z= !OFdE  
 bih.biBitCount=btm.bmBitsPixel; ZC<EPUV(  
 bih.biClrImportant=0; Sz')1<  
 bih.biClrUsed=0; p:{L fQ  
 bih.biCompression=0; o54=^@>O<j  
 bih.biHeight=btm.bmHeight; T('rM :)/  
 bih.biPlanes=1; lb=fS%  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,pf\g[tz  
 bih.biSizeImage=size; h<PS<  
 bih.biWidth=btm.bmWidth; 85] 'I%gT  
 bih.biXPelsPerMeter=0; h4Arg~Or  
 bih.biYPelsPerMeter=0; lU&2K$`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9(vp`Z8B4  
 static int filecount=0; EQZ/v gho  
 CString name; .RmoO\ ,Gm  
 name.Format("pict%04d.bmp",filecount++); !,5qAGi0  
 name=m_Path+name; p?P.BU\CR  
 BITMAPFILEHEADER bfh; m6 xbO  
 bfh.bfReserved1=bfh.bfReserved2=0; s- 0Xt<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9:Bn-3)  
 bfh.bfSize=54+size; aYHs35  
 bfh.bfOffBits=54; }S13]Kk?=  
 CFile bf; <8Zs; >YuK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *p0n^XZ% ?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8. +f@wv  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N}{V*H^0QU  
  bf.WriteHuge(lpData,size); EBQ_c@  
  bf.Close(); .N\t3\9}  
  nCount++; 7X> @r"9<  
 } X`eX+9  
 GlobalFreePtr(lpData);  dBN:  
 if(nCount==1) {`J!DFfur  
  m_Number.Format("%d picture captured.",nCount); (r}StR+  
 else \RFA?PuY  
  m_Number.Format("%d pictures captured.",nCount); /; 21?o  
  UpdateData(FALSE); &f?JtpB  
} NxK.q)tj6  
^r7KEeVD  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .i` -t"  
{ %P#| }  
 if(pMsg -> message == WM_KEYDOWN) a8k`Wog  
 { {cdrMP@""  
  if(pMsg -> wParam == VK_ESCAPE) 9]tW;?  
   return TRUE; M.)z;[3O  
  if(pMsg -> wParam == VK_RETURN) $~ d6KFT  
   return TRUE; wXBd"]G)C  
 } CR#-!_=4  
 return CDialog::PreTranslateMessage(pMsg); Z7e"4w A  
} AAB_Ytf  
,MHF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o`'4EVw*  
{ I\j-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Zny9TP  
  SaveBmp(); {%, 4P_m  
  return FALSE; PtL8Kd0`C  
} .uN(44^+x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uLI;_,/:  
 CMenu pop; JZ-64OT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]f wW dtz1  
 CMenu*pMenu=pop.GetSubMenu(0); 8/u kzY1!  
 pMenu->SetDefaultItem(ID_EXITICON); KR hls"\1  
 CPoint pt; "(';UFa  
 GetCursorPos(&pt); pB%oFWqK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^HI2Vp  
 if(id==ID_EXITICON) 20J-VN:  
  DeleteIcon(); G1ruF8  
 else if(id==ID_EXIT) k<N5*k8M  
  OnCancel(); ]}]+aB  
 return FALSE; j[t2Bp  
} } z7yS.{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mU||(;I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f&] !;)  
 AddIcon(); "uyr@u0b  
 return res; .=hVto[QC  
} >29c[O"[  
F^}d>2W(  
void CCaptureDlg::AddIcon() b1."mT!p  
{ G2|G}#E  
 NOTIFYICONDATA data; , BZ(-M  
 data.cbSize=sizeof(NOTIFYICONDATA); 0+e 0<'  
 CString tip; 2:yXeSeA  
 tip.LoadString(IDS_ICONTIP); X1V~.k vt)  
 data.hIcon=GetIcon(0); hOdU%  
 data.hWnd=GetSafeHwnd(); 2G3Hi;q18  
 strcpy(data.szTip,tip); ^R7X!tOq4  
 data.uCallbackMessage=IDM_SHELL; YXdo&'Q<qX  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?D_}',Wx  
 data.uID=98; :."+&gb  
 Shell_NotifyIcon(NIM_ADD,&data); yy3`E}vX7  
 ShowWindow(SW_HIDE); F2)KAIl  
 bTray=TRUE; qB`%+<)C  
} %\!0*(8  
2%H_%Zu9  
void CCaptureDlg::DeleteIcon() jOK !k  
{ sY]pszjT  
 NOTIFYICONDATA data; [~n |ROo  
 data.cbSize=sizeof(NOTIFYICONDATA); Sj8fo^K50  
 data.hWnd=GetSafeHwnd(); aan(69=jz  
 data.uID=98; p}X *HJq$  
 Shell_NotifyIcon(NIM_DELETE,&data); 5,Co(K  
 ShowWindow(SW_SHOW); jz\>VYi(7  
 SetForegroundWindow(); RyWfoLc  
 ShowWindow(SW_SHOWNORMAL); YnCuF0>  
 bTray=FALSE; lfR}cx  
} l#p?lBm1  
bp}]'NA  
void CCaptureDlg::OnChange() zMO xJ   
{ s)sT\crP@  
 RegisterHotkey(); CT<z1)#@^  
} swLNNA.  
wx2 z9Q  
BOOL CCaptureDlg::RegisterHotkey() m/,8\+  
{ m YhDi  
 UpdateData(); {OS[0LB  
 UCHAR mask=0; =">0\#  
 UCHAR key=0; Q7mikg=1-  
 if(m_bControl) }me`(zp  
  mask|=4; hN!{/Gc|  
 if(m_bAlt) MOuEsm;  
  mask|=2; !4YmaijeN  
 if(m_bShift) $?pfst~;O  
  mask|=1; [Qqss8a  
  key=Key_Table[m_Key.GetCurSel()]; $:vS_#  
 if(bRegistered){ V.ae 5@;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m*KI'~#$%  
  bRegistered=FALSE; 7--E$ !9O,  
 } ydE}.0zN  
 cMask=mask; F C=N}5u  
 cKey=key; 9*r l7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e8z?) 4T  
 return bRegistered; <DEu]-'>  
} 5R1? jlm  
(Q.I DDlr  
  四、小结 }|znQ3A2\l  
l o- 42)  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八