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
  • 5946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: ^_9 ^iL  
  NoO>CjeFb  
  一、实现方法 7Gnslp?[U  
%eGxQDIXg  
  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: d#Sc4xuf  
DalQ.   
#pragma data_seg("shareddata") y A?>v'K  
HHOOK hHook =NULL; //钩子句柄 xr&wV0O '  
UINT nHookCount =0; //挂接的程序数目 fO[X<|9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `J[(Dx'y=t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G]E$U]=9r:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .{`+bT^b<2  
static int KeyCount =0; qF`;xa%,}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,pa,:k?  
#pragma data_seg() 0 lXV+lj  
%eT4Q~}5"  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 F')T:;,s  
/D`M?nD7  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: sSd  
j|FGb:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +P/"bwv0  
cKey,UCHAR cMask) Wa #,>  
{ >9a%"<(2#  
 BOOL bAdded=FALSE; V"%2Tz  
 for(int index=0;index<MAX_KEY;index++){ -}%'I ]R=  
  if(hCallWnd[index]==0){ R"6Gm67t  
   hCallWnd[index]=hWnd; leiED'  
   HotKey[index]=cKey; >s1FTB-$W  
   HotKeyMask[index]=cMask; &JAQ:([:  
   bAdded=TRUE; bv;&oc:r  
   KeyCount++; 6#T?g7\pyR  
   break; RKdf1C  
  } E"!9WF(2t5  
 } 1)/B V{n  
 return bAdded; kMKI=>s+  
} GC66n1- X  
//删除热键 +cvz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GsqR8n=  
{ x,E#+ m  
 BOOL bRemoved=FALSE; 0t}=F 4@&a  
 for(int index=0;index<MAX_KEY;index++){ 0 !9vGs  
  if(hCallWnd[index]==hWnd){ g-pDk*|I,Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &FHE(7}/#  
    hCallWnd[index]=NULL; )PL'^gR r  
    HotKey[index]=0; , M/-lW  
    HotKeyMask[index]=0; T~s/@*y9  
    bRemoved=TRUE; _bqiS]:  
    KeyCount--; "M v%M2'c  
    break; _t6siB_u  
   } _Ta9rDSP]  
  } [?RLvhU|  
 } TSdjX]Kf  
 return bRemoved; -kZz,pNQ,  
} $ 1H?k  
"sz LTC]*6  
WEqHL,Uh]  
  DLL中的钩子函数如下: Xx:0Nt]  
q?[{fcNh$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d%1S6eYa'  
{ G(JvAe]r  
 BOOL bProcessed=FALSE; %83PbH  
 if(HC_ACTION==nCode) u9:;ft{}N  
 { 1]A%lud4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $Bz|[=  
   switch(wParam) <E$P  
   {  +6*oO|   
    case VK_MENU: lk \|EG  
     MaskBits&=~ALTBIT; rr3NY$W  
     break; j_&/^-;e  
    case VK_CONTROL: 4S  2I]d  
     MaskBits&=~CTRLBIT; 7$x@;%xd  
     break; I m_yY  
    case VK_SHIFT: m{mK;D  
     MaskBits&=~SHIFTBIT; + h`:qB  
     break; qz E/n   
    default: //judge the key and send message PdMx6 Ab  
     break; J4j?rLR3p  
   } [Qy]henK  
   for(int index=0;index<MAX_KEY;index++){ S#jH2fRo  
    if(hCallWnd[index]==NULL) V?Lf& X?  
     continue; o80pmy7@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x?:WR*5w  
    { ETH`.~%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j!mI9*hP  
     bProcessed=TRUE; 1)#<nk)I  
    } ~IE:i-Kz  
   } H b]    
  } o4Fh`?d}  
  else if((lParam&0xc000ffff)==1){ //有键按下 mb0${n~fz  
   switch(wParam) <$UMMA  
   { b$PNZC8f  
    case VK_MENU: `!qWHm6I*  
     MaskBits|=ALTBIT; ?-#w [J'6  
     break; RduA0@g0  
    case VK_CONTROL: (d^pYPr{  
     MaskBits|=CTRLBIT; ~S|Vd  
     break; ,U>g LTS  
    case VK_SHIFT: #$jAGt3^BT  
     MaskBits|=SHIFTBIT; :b=`sUn<X+  
     break; s7FqE>#c0  
    default: //judge the key and send message n+zXt?{u  
     break; /,Ln)?eD  
   } ]_d(YHYf  
   for(int index=0;index<MAX_KEY;index++){ hx)Ed  
    if(hCallWnd[index]==NULL) KPW: r#d  
     continue; x9Gm)~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ip8 Ap$  
    { C1p |.L?m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v&H&+:<  
     bProcessed=TRUE; fQ#mx.|8y  
    } X%`8h _  
   } s<:"rw`  
  } . Nog.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4I:Jb;k>  
   for(int index=0;index<MAX_KEY;index++){ (`3 Bi]7  
    if(hCallWnd[index]==NULL) H.Jcp|k[;  
     continue; y>~=o9J_u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]a _;*Xq8d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }y=7r!{@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .a=M@; p  
   } L4Nk+R;  
  } zG [-n.  
 } bn<&Xe  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T:; e73  
} oVl:./(IB  
<+_OgF1G  
  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: B'yN &3  
U%gP2]t%cs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y::KjB 0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WgE~H)_%  
hJFQ/(  
  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: 2Q9s?C   
r2""p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;-*4 (3lu  
{ JFYeOmR+l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) M/UJb1<  
 { LYWQqxB  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iY;)R|6  
  SaveBmp(); M_9|YjwS  
  return FALSE; Kwh3SU=L}  
 } QR4v6*VpD  
 …… //其它处理及默认处理 eWwSD#N#  
} @q^WD_k  
>#!n"i;  
DKK200j  
  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。 zc/S  
i.F[.-.  
  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。 Z]9 )1&  
Ij=hmTl{P  
  二、编程步骤 Cc!n`%qc  
O "{o (  
  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"; c%xxsq2n  
BAm{Gb  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &]#D`u  
T+sO(;  
  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; i]Kq  
[W^6=7EO  
  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; 1ed#nB %  
j1/J9F'  
  5、 添加代码,编译运行程序。 3kKXzIh  
-MB ,]m  
三、程序代码 x!I7vs~~zW  
 |2n2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >{m>&u;Cc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {tWfLfzU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /eIwv 31  
#if _MSC_VER > 1000 <#`<Ys3b*!  
#pragma once ^GRd;v=-@  
#endif // _MSC_VER > 1000 DCw ldkdJN  
#ifndef __AFXWIN_H__ =FwFqjvl  
#error include 'stdafx.h' before including this file for PCH _ZR2?y-M  
#endif Oh8;YE-%  
#include "resource.h" // main symbols :Ur%.0  
class CHookApp : public CWinApp (%I`EAR  
{ !_x-aro3<  
 public: -Ep-v4}  
  CHookApp(); pdtK3Pf  
  // Overrides 2H]&3kM3X  
  // ClassWizard generated virtual function overrides U6M4}q(N]  
  //{{AFX_VIRTUAL(CHookApp) v{%2`_c  
 public: >aa-ix &  
  virtual BOOL InitInstance(); F}sfk}rp  
  virtual int ExitInstance(); Kx<bVK4"  
  //}}AFX_VIRTUAL 0D.YO<PU  
  //{{AFX_MSG(CHookApp) 8dL(cC  
  // NOTE - the ClassWizard will add and remove member functions here. V2.MZ9  
  // DO NOT EDIT what you see in these blocks of generated code ! Mb$&~!  
  //}}AFX_MSG eRv3ZHH  
  DECLARE_MESSAGE_MAP() W}T+8+RU  
}; B3I< $  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -.z~u/uL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rJ<v1Yb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B}*xrPj  
BOOL InitHotkey(); m _:ib}  
BOOL UnInit(); ~G"6^C:x  
#endif @$~%C) %u  
ZEApE+m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BJ{mX>I(  
#include "stdafx.h" _jnH!Mw  
#include "hook.h" nq_sbli  
#include <windowsx.h> (wbG0lu  
#ifdef _DEBUG X0 %k`3  
#define new DEBUG_NEW 1[B?nk  
#undef THIS_FILE AZtZa'hbkQ  
static char THIS_FILE[] = __FILE__; =_v_#;h&  
#endif c()F%e:n  
#define MAX_KEY 100 e'7!aysj  
#define CTRLBIT 0x04 #M8"b]oh6  
#define ALTBIT 0x02 GS)l{bS#[O  
#define SHIFTBIT 0x01 iyj&O"  
#pragma data_seg("shareddata") ,gRsbC  
HHOOK hHook =NULL; ^*Rrx  
UINT nHookCount =0; 'MsxZqW"~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <4(rY9   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 30F&FTW  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V-I_SvWv\  
static int KeyCount =0; o1kLT@VCl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j7uiZU;3Rx  
#pragma data_seg() ~W`upx)j  
HINSTANCE hins; _=, [5"  
void VerifyWindow(); !&19%C4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `Jz"rh-M  
//{{AFX_MSG_MAP(CHookApp) 9~>;sjJk  
// NOTE - the ClassWizard will add and remove mapping macros here. :Fm+X[n  
// DO NOT EDIT what you see in these blocks of generated code! L!/USh:IP  
//}}AFX_MSG_MAP qW7S<ouh  
END_MESSAGE_MAP() @gs Kb* ,  
sFB; /*C  
CHookApp::CHookApp() HM--`RJ  
{ $7PFos%@  
 // TODO: add construction code here, 2:2rwH }e  
 // Place all significant initialization in InitInstance kS+*@o  
} 3pq&TYQU  
~fQ#-ekzqk  
CHookApp theApp; Z&/;6[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7eh}Je8  
{ AA yzT*^  
 BOOL bProcessed=FALSE; S{J$[!F  
 if(HC_ACTION==nCode) %.<w8ag  
 {  aA0aW=R  
  if((lParam&0xc0000000)==0xc0000000){// Key up eK3J9 ;X  
   switch(wParam) !XgkK k  
   { HtS:'~DYo  
    case VK_MENU: 1LcQ*d  
     MaskBits&=~ALTBIT; ggX'`bK  
     break; '&s:,o-p  
    case VK_CONTROL: wCc:HfmjJ  
     MaskBits&=~CTRLBIT; 9j9A'Y9(  
     break; rWSw1(sAA  
    case VK_SHIFT: }U+gJkY2  
     MaskBits&=~SHIFTBIT; j1<@ *W&b  
     break; 1kTJMtZG~  
    default: //judge the key and send message RI cA)I.  
     break; zneK)C8&q3  
   } P1H`NOC  
   for(int index=0;index<MAX_KEY;index++){ 7kG>s9O  
    if(hCallWnd[index]==NULL) `<+D<x)(3  
     continue; hwkol W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UGr7,+N&w  
    { &*L:4By)]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jskATA /  
     bProcessed=TRUE; J%D'Xlb  
    } mVU(u_lh  
   } Px'%5TKN  
  } E%jOJA  
  else if((lParam&0xc000ffff)==1){ //Key down `^(6{p ?  
   switch(wParam) 8|V6RgA%  
   { RR^I*kRH  
    case VK_MENU: 0(-'L\<>x  
     MaskBits|=ALTBIT; ^|as]x!sv  
     break; ].2q.7Yur  
    case VK_CONTROL: WihOGdUS6  
     MaskBits|=CTRLBIT; =^=9z'u"=  
     break; xdp{y =,[  
    case VK_SHIFT: +<@7x16  
     MaskBits|=SHIFTBIT; ~D<o}ItRF  
     break; 0XL x@FYn  
    default: //judge the key and send message  {EZ ;  
     break; ]@M$.msg@  
   } -4Y}Y5 9\  
   for(int index=0;index<MAX_KEY;index++) b*r1Jn"h  
   { Cl4y9|  
    if(hCallWnd[index]==NULL) g :e|  
     continue; 42t D$S5^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <k}>eGn  
    { D OPOzh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kw|bEL9!u  
     bProcessed=TRUE; '_@=9 \<  
    } u|9^tHT>  
   } %^gT.DsX-  
  } L=4?vs  
  if(!bProcessed){ ?nj _gL  
   for(int index=0;index<MAX_KEY;index++){ uoaF(F-  
    if(hCallWnd[index]==NULL) fy9{W@E3p  
     continue; w0tlF:Eg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LDr!d1A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ri aO`|1  
   } ^/mQo`[G  
  } LQNu]2  
 } m7^a4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E^#|1Kpq  
} DQH _@-q  
aztP`S$h  
BOOL InitHotkey() 4D9l Za}  
{ XC0G5rtB  
 if(hHook!=NULL){ Af ^6  
  nHookCount++; x-CY G?-x  
  return TRUE; JB''Ujyi  
 } a%Cq?HZ7  
 else 6DR@$fpt  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); SU2 (XP]5  
  if(hHook!=NULL) DV*8Mkzg  
   nHookCount++; =EsKFt"  
  return (hHook!=NULL); {eqUEdC  
} 8Tv;,a  
BOOL UnInit() 76$19  
{ +J_A *B  
 if(nHookCount>1){ f+%J=Am  
  nHookCount--; $vlgiJ&f  
  return TRUE; fcD$km  
 } u%VO'}Gz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); p0`Wci  
 if(unhooked==TRUE){ ~ E>D0o  
  nHookCount=0; a5L#c=  
  hHook=NULL; 'rp(k\ pY  
 } J Y %B:  
 return unhooked; qC.jXU?rO  
} I2YQIY+  
4U C/pGZY  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pk: ruf`)  
{ &Mo=V4i>  
 BOOL bAdded=FALSE; Nd^9.6,JU  
 for(int index=0;index<MAX_KEY;index++){ '1=/G7g  
  if(hCallWnd[index]==0){ @\u)k  
   hCallWnd[index]=hWnd; %jKR\f G  
   HotKey[index]=cKey; @Eqc&v!O  
   HotKeyMask[index]=cMask; g%1!YvS3v  
   bAdded=TRUE; 91mXvQ:u  
   KeyCount++; #x)G2T'?  
   break; V{ra,a*  
  } V*U"OJ%  
 } DtXXfp@;  
 return bAdded; \C/`?"4w  
} 5#$E4k:YV  
=h5&\4r=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $-M1<?5  
{ nU)}!` E  
 BOOL bRemoved=FALSE; NTs< ;ED  
 for(int index=0;index<MAX_KEY;index++){ [)Xu60? Q  
  if(hCallWnd[index]==hWnd){ pWbzBgM?nU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iDp]l u  
    hCallWnd[index]=NULL; zdU<]ge  
    HotKey[index]=0; "MM7qV  
    HotKeyMask[index]=0; {nm#aA%,  
    bRemoved=TRUE; aE1h0`OT  
    KeyCount--; yY[[)  
    break; Dn<2.!ZKQ  
   } v-42_}  
  } $C,f>^1  
 } H Y.,f_m  
 return bRemoved; <4C`^p  
} JNuo+Pq  
f ,K1a9.  
void VerifyWindow() xf% ,UQ  
{ )1~4Tl,S  
 for(int i=0;i<MAX_KEY;i++){ kH-1l>":  
  if(hCallWnd!=NULL){  ZMg%/C  
   if(!IsWindow(hCallWnd)){ TLPy/,  
    hCallWnd=NULL; J j yQ  
    HotKey=0; 0pBlmPafY  
    HotKeyMask=0; j=PQoEtU'<  
    KeyCount--; q,QMvUK:  
   } T/)$}#w0i  
  } i3rvD ch  
 } =f.f%g6  
} JEU?@J71O  
E)#3*Wlu$  
BOOL CHookApp::InitInstance() D'|#5>G  
{ -58r* [=8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); }I; =IYrN  
 hins=AfxGetInstanceHandle(); aNv6 "  
 InitHotkey(); :*1|ERGoay  
 return CWinApp::InitInstance(); [~f%z(vI  
} &p=|z2 J  
X7NRQ3P@  
int CHookApp::ExitInstance() ',*I=JW;  
{ (^eE8j/K  
 VerifyWindow(); vh KA8vr  
 UnInit(); .7+_ubj&,  
 return CWinApp::ExitInstance(); wV W+~DJ  
} (aiE!c  
42U3>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \1aj!)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) VskyRxfdW3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ xg. d)n  
#if _MSC_VER > 1000 1a/@eqF''  
#pragma once rM=Q.By+\  
#endif // _MSC_VER > 1000 /<zBcpVNV  
bveNd0hN  
class CCaptureDlg : public CDialog +%UXI$v  
{ VP0wa>50!  
 // Construction ? Yy[8_(tN  
 public: 76zi)f1f  
  BOOL bTray; &q``CCOF&  
  BOOL bRegistered; %mtW-drv>  
  BOOL RegisterHotkey(); )nQpO"+M  
  UCHAR cKey; @6h=O`X>  
  UCHAR cMask; "%qGcC8  
  void DeleteIcon(); A}H)ojG'v  
  void AddIcon(); *2=:(OK  
  UINT nCount; vRRi"bo  
  void SaveBmp(); 8'Z9Z*^h#x  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor x8b w#  
  // Dialog Data /bfsC& 3  
  //{{AFX_DATA(CCaptureDlg) KB *[b  
  enum { IDD = IDD_CAPTURE_DIALOG }; #E{OOcM  
  CComboBox m_Key; 1wE~dpnx  
  BOOL m_bControl; @~QW~{y  
  BOOL m_bAlt; uH65DI<  
  BOOL m_bShift; gPQ2i])"Q  
  CString m_Path; Ks8S^77  
  CString m_Number; JS!rZi  
  //}}AFX_DATA oKA8)~Xqou  
  // ClassWizard generated virtual function overrides WH/r$.&  
  //{{AFX_VIRTUAL(CCaptureDlg) ]/bf#&@g`k  
 public: 5c3 )p^ ]g  
  virtual BOOL PreTranslateMessage(MSG* pMsg); C1r]kF  
 protected: v(h   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *oZBv4Vh   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _d %H;<_  
  //}}AFX_VIRTUAL lwQI 9U[O2  
  // Implementation 5a5 I+* c  
 protected: 2+sNt6B2  
  HICON m_hIcon; &0Wv+2l @  
  // Generated message map functions &" K74  
  //{{AFX_MSG(CCaptureDlg) Z3~$"V*ZB{  
  virtual BOOL OnInitDialog(); J3S@1"   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2@uo2]o)  
  afx_msg void OnPaint(); | 1T2<ZT  
  afx_msg HCURSOR OnQueryDragIcon(); #^yw!~:{  
  virtual void OnCancel(); 0&2TeqsLh)  
  afx_msg void OnAbout(); i7mT<w>?  
  afx_msg void OnBrowse(); `<b 3e(A  
  afx_msg void OnChange(); q`"gT;3S  
 //}}AFX_MSG qD7# q]  
 DECLARE_MESSAGE_MAP() `[VoW2CLH+  
}; pWwaN4  
#endif h1FM)n[E7  
~O 65=8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6$ 9n_AS  
#include "stdafx.h" oizD:|  
#include "Capture.h" )/Ee#)z*  
#include "CaptureDlg.h" iW.8+?Xq&  
#include <windowsx.h> e@NS=U` <  
#pragma comment(lib,"hook.lib") 6b6}HO  
#ifdef _DEBUG Q$iv27  
#define new DEBUG_NEW )O#>ONm^  
#undef THIS_FILE [0Z r z+q  
static char THIS_FILE[] = __FILE__; a}hpcr({?  
#endif J+Q ;'J  
#define IDM_SHELL WM_USER+1 2/E3~X7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5?kF'yksR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F1w~f <  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jiC;*]n  
class CAboutDlg : public CDialog daGGgSbh  
{ C8-4 m68"  
 public: kNd[M =%  
  CAboutDlg(); a^,6[  
  // Dialog Data m9wV#Ldu  
  //{{AFX_DATA(CAboutDlg) mI@E>VCV[  
  enum { IDD = IDD_ABOUTBOX }; st+X~;PX*  
  //}}AFX_DATA 0p*(<8D}  
  // ClassWizard generated virtual function overrides dfO@Yo-?*'  
  //{{AFX_VIRTUAL(CAboutDlg) A_CEpG]  
 protected: 2oGl"3/p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M _Z*F!al<  
  //}}AFX_VIRTUAL 7'J}|m{7  
  // Implementation 1Xu\Tm\Ux  
 protected: dAm( uJ  
  //{{AFX_MSG(CAboutDlg) LXJ"ct  
  //}}AFX_MSG =S|SQz5%w  
  DECLARE_MESSAGE_MAP() 9fzbR~s  
}; 5d*k[fZ  
Y \& 4`v'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jc-0.^]E}  
{ r2M._}bF  
 //{{AFX_DATA_INIT(CAboutDlg) h<$Vry}  
 //}}AFX_DATA_INIT ^7.864  
} [NQ`S ~_:  
>]&LbUW+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4%KNHeaN  
{ k$i76r  
 CDialog::DoDataExchange(pDX); |9?67-  
 //{{AFX_DATA_MAP(CAboutDlg) ,CA,7Mu:  
 //}}AFX_DATA_MAP 5A>W;Q\4  
} U~s&}M\n  
V`l.F"<L  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v,KH2 (N  
 //{{AFX_MSG_MAP(CAboutDlg) M9 fAv  
 // No message handlers lJ62[2=V  
 //}}AFX_MSG_MAP '2WYbcU  
END_MESSAGE_MAP() `N_NzH  
o/CSIvz1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;Tvy)*{  
: CDialog(CCaptureDlg::IDD, pParent) _E{SGbCCi  
{ ]O,!B''8k  
 //{{AFX_DATA_INIT(CCaptureDlg) y4/>3tz;  
  m_bControl = FALSE; 5Q?7 xTQ  
  m_bAlt = FALSE; )^|zuYzN  
  m_bShift = FALSE; ]mn(lK  
  m_Path = _T("c:\\"); 0"ZB|^c=  
  m_Number = _T("0 picture captured."); kgEGL]G>  
  nCount=0; G!ty@ Fx  
  bRegistered=FALSE; ",B92[}Ar  
  bTray=FALSE; xzyV| (  
 //}}AFX_DATA_INIT DCACj-f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `2o/W]SSk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c}U&!R2p{  
} Y 'Yoc  
C8m8ys  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Aq^1(-g  
{ c#<v:b  
 CDialog::DoDataExchange(pDX); ([qw#!;w;  
 //{{AFX_DATA_MAP(CCaptureDlg) &s_[~g<  
  DDX_Control(pDX, IDC_KEY, m_Key); HfFP4#C,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N*|Mfpf  
  DDX_Check(pDX, IDC_ALT, m_bAlt); JrQd7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u%Hegqn  
  DDX_Text(pDX, IDC_PATH, m_Path); 6w0/;8(_m  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Z h)Qq?H  
 //}}AFX_DATA_MAP G)?VC^Q  
} </5uB' B ^  
isLIfE>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) eRWTuIV6  
//{{AFX_MSG_MAP(CCaptureDlg) P B.@G,)  
 ON_WM_SYSCOMMAND() IR;lt 3  
 ON_WM_PAINT() J-:\^uP  
 ON_WM_QUERYDRAGICON() ^.&2-#i  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Q$iYhR  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |O%`-2p]p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) </>;PnzE  
//}}AFX_MSG_MAP V&-pgxf;  
END_MESSAGE_MAP() ac6L3=u\  
%?' jyK  
BOOL CCaptureDlg::OnInitDialog() l5b? 'L  
{ .,)NDG4Q  
 CDialog::OnInitDialog(); 0V uG(O  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @{+c6.*}  
 ASSERT(IDM_ABOUTBOX < 0xF000); s_N?Y)lS+(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6 wYd)MDLL  
 if (pSysMenu != NULL) 4N[8LC;MH  
 { q~^Jd=cB\  
  CString strAboutMenu; bJ*jJl x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); GPy+\P`  
  if (!strAboutMenu.IsEmpty()) nbj&3z,  
  { \S{ise/U  
   pSysMenu->AppendMenu(MF_SEPARATOR); VC:.ya|Z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); u7=`u/  
  } QeuIAs*_  
 } w^s|YF=c  
 SetIcon(m_hIcon, TRUE); // Set big icon _n,Ye&m  
 SetIcon(m_hIcon, FALSE); // Set small icon gI~R u8  
 m_Key.SetCurSel(0); (|(#~o]40t  
 RegisterHotkey(); _Jn-#du  
 CMenu* pMenu=GetSystemMenu(FALSE); _Y4%Fv>@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t4R=$ km  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aze}ko NE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ms ;:+JI  
 return TRUE; // return TRUE unless you set the focus to a control Z 7rVM   
} C:\BvPoO  
~e~iCyW;S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )@Fuw*  
{ 8%S5Fc #am  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tY-{uHW&h  
 { &> tmzlww  
  CAboutDlg dlgAbout; 8  ;y N  
  dlgAbout.DoModal(); })#6 BN  
 } 9^h0D}#@  
 else 9YS&RBJu  
 { &x =}m  
  CDialog::OnSysCommand(nID, lParam); _5 Zhv-7  
 } p}$VBl$'  
} ;i\m:8!;  
"q5Tw+KCfu  
void CCaptureDlg::OnPaint() ~W p>tnl  
{ ;N6Euiz  
 if (IsIconic())  i1v0J->  
 { Nb~.6bsL  
  CPaintDC dc(this); // device context for painting n@<+D`[.V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); FO#`}? R`  
  // Center icon in client rectangle V`sINX  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;^za/h>r  
  int cyIcon = GetSystemMetrics(SM_CYICON); M >#kfSF+  
  CRect rect; >0z(+}]3z  
  GetClientRect(&rect); e~w-v"'  
  int x = (rect.Width() - cxIcon + 1) / 2; 7SOi9JU_  
  int y = (rect.Height() - cyIcon + 1) / 2; 49q\/  
  // Draw the icon FJDx80J  
  dc.DrawIcon(x, y, m_hIcon); o{5es  
 } th]1> .  
 else ys`"-o[*  
 { 99j^<)  
  CDialog::OnPaint(); T~@$WM(  
 } ;L (dmx?  
} MwMv[];I  
lcR53X  
HCURSOR CCaptureDlg::OnQueryDragIcon() Q^}6GS$  
{ = s^KZV  
 return (HCURSOR) m_hIcon; =oz$uD}?  
} ]f#1G$  
Loo48  
void CCaptureDlg::OnCancel() (!`TO{!6P  
{ j#mo Vq  
 if(bTray) N]f"+  
  DeleteIcon(); N=R|s$,Oy9  
  CDialog::OnCancel(); :!H]gC 4  
} 3m:[o`L  
}{/3yXk[G  
void CCaptureDlg::OnAbout() ;LSdY}*%0  
{ R+ #(\  
 CAboutDlg dlg; f'._{"  
 dlg.DoModal(); C{AVV<  
} j_ i/h "  
faH113nc  
void CCaptureDlg::OnBrowse() fR[kjwX)<1  
{ qk!")t  
 CString str;  d(!W  
 BROWSEINFO bi; hZ6CiEJB  
 char name[MAX_PATH]; #;,dk(URo  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _ T ;+*  
 bi.hwndOwner=GetSafeHwnd(); =s3f{0G  
 bi.pszDisplayName=name; w$%d"Jm#X  
 bi.lpszTitle="Select folder"; g*]Gc%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0RmQfD>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t:|knZq  
 if(idl==NULL) LA?h+)  
  return; 9,8}4Y=GVI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 92zo+bc  
 str.ReleaseBuffer(); C 8 [W  
 m_Path=str; Z#w@ /!"}T  
 if(str.GetAt(str.GetLength()-1)!='\\') :Z rE/3_S  
  m_Path+="\\"; h2M>4c  
 UpdateData(FALSE); x`:zC#  
} G1K72M}CW  
B"sQ\gb%Q  
void CCaptureDlg::SaveBmp() 7\ELr 5  
{ DPIIE2X  
 CDC dc; i`#5dIb   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .KH3.v/c|  
 CBitmap bm; P")duv  
 int Width=GetSystemMetrics(SM_CXSCREEN); %^1@c f?.  
 int Height=GetSystemMetrics(SM_CYSCREEN); (<y~]igy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \Eqxmo  
 CDC tdc; %C}TdG(C  
 tdc.CreateCompatibleDC(&dc); b|_Pt  
 CBitmap*pOld=tdc.SelectObject(&bm); N0`v;4gF$]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;oL`fQyr  
 tdc.SelectObject(pOld);  0Bbno9Yp  
 BITMAP btm; 6%N.'wf  
 bm.GetBitmap(&btm); s'/b&Idf8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #bk[Zj&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v8=7  
 BITMAPINFOHEADER bih; II(7U3  
 bih.biBitCount=btm.bmBitsPixel; Buazm3q8H  
 bih.biClrImportant=0; #Fp5>%*  
 bih.biClrUsed=0; ibe#Y  
 bih.biCompression=0; q0* e1QL  
 bih.biHeight=btm.bmHeight; eAvOT$  
 bih.biPlanes=1; 6KT]3*B   
 bih.biSize=sizeof(BITMAPINFOHEADER); }@VdtH  
 bih.biSizeImage=size; ue?e}hF  
 bih.biWidth=btm.bmWidth; ~ti{na4W<  
 bih.biXPelsPerMeter=0; J QSp2b@'H  
 bih.biYPelsPerMeter=0; 7&ty!PpD  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @JFfyQ {-  
 static int filecount=0; -44{b<:D  
 CString name; !cblmF;0  
 name.Format("pict%04d.bmp",filecount++); GJ1ap^k  
 name=m_Path+name; l]:nncpns  
 BITMAPFILEHEADER bfh; 2|2'?  
 bfh.bfReserved1=bfh.bfReserved2=0; kY e3A &J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7;]n+QRfm  
 bfh.bfSize=54+size; i{1SUx+Re  
 bfh.bfOffBits=54; sw:o3cC]  
 CFile bf; 3RSiu}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ PWU8 9YXp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Rn] `_[)*~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Na6z1&wS  
  bf.WriteHuge(lpData,size); <K6:"  
  bf.Close(); S(bYN[U  
  nCount++; RZKdh}B?\  
 } h%2;B;p]  
 GlobalFreePtr(lpData); A}./ ;[  
 if(nCount==1) \J@i:J6x$1  
  m_Number.Format("%d picture captured.",nCount); AC`4n|,zJ;  
 else WX2:c,%:  
  m_Number.Format("%d pictures captured.",nCount); ey icMy`7{  
  UpdateData(FALSE); 5G$sP,n  
} QOb+6qy:3  
R<"fcsU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `TugtzRU  
{ V_)G=#6Dy  
 if(pMsg -> message == WM_KEYDOWN) (+M]C]  
 { >j&+mii  
  if(pMsg -> wParam == VK_ESCAPE)  _tl  
   return TRUE; 6I5,PB  
  if(pMsg -> wParam == VK_RETURN) H83Gx;  
   return TRUE; *OoM[wEY  
 } \U(;%V  
 return CDialog::PreTranslateMessage(pMsg); >%x N?%  
} fMGL1VN  
/&PRw<}>_o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EL--?<g  
{ ]f%yeD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ LYYz =gvZl  
  SaveBmp(); =IbDGw(  
  return FALSE; `>.^/SGu>?  
} U^AywE]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~Bw)rf,  
 CMenu pop; xK7xAO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4FWL\;6  
 CMenu*pMenu=pop.GetSubMenu(0); 701mf1a  
 pMenu->SetDefaultItem(ID_EXITICON); m {dXN=  
 CPoint pt; 6a_MA*XK  
 GetCursorPos(&pt); UaW,#P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?vnO@Bb/a  
 if(id==ID_EXITICON) H> zX8qP+  
  DeleteIcon(); n\X'2  
 else if(id==ID_EXIT) )qyJw N .D  
  OnCancel(); +JDQ`Qk  
 return FALSE; X`,=tM  
} r4X0. mPY*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *y6zwe !M  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S-^:p5{r  
 AddIcon(); Bf)}g4nYn  
 return res; :TPT]q d@  
} j@7%%   
q?&Ap*  
void CCaptureDlg::AddIcon() &oU) ,H  
{ B^;G3+}  
 NOTIFYICONDATA data; "L?h@8sa  
 data.cbSize=sizeof(NOTIFYICONDATA); o7_*#5rD  
 CString tip; @ )bCh(u  
 tip.LoadString(IDS_ICONTIP); D90.z"N\i9  
 data.hIcon=GetIcon(0); {c(@u6l28  
 data.hWnd=GetSafeHwnd(); xZMQ+OW2i  
 strcpy(data.szTip,tip); ( o(,;  
 data.uCallbackMessage=IDM_SHELL; zCpsGr  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ,sa%u Fm  
 data.uID=98; =sp5.-r  
 Shell_NotifyIcon(NIM_ADD,&data); =hw&2c  
 ShowWindow(SW_HIDE); `f|Gw5R  
 bTray=TRUE; j=q*b Qr  
}  xJ&E2Bf  
ZqONK^  
void CCaptureDlg::DeleteIcon() PU& v{gn  
{ B4l*]K%  
 NOTIFYICONDATA data; 2aDjt{7P  
 data.cbSize=sizeof(NOTIFYICONDATA); z(o zMH  
 data.hWnd=GetSafeHwnd(); &d%0[Ui`  
 data.uID=98; x>C_O\  
 Shell_NotifyIcon(NIM_DELETE,&data); g-4m.;  
 ShowWindow(SW_SHOW); ' F,.y6QU  
 SetForegroundWindow();  Zk={3Y  
 ShowWindow(SW_SHOWNORMAL); ekR/X  
 bTray=FALSE; r bfIH":  
} cs-wqxTX[$  
6I<^wS9j_  
void CCaptureDlg::OnChange() 3 |se]~  
{ |H .  
 RegisterHotkey(); kWSei3  
} o0Z~9iF&  
ep,"@,,  
BOOL CCaptureDlg::RegisterHotkey() C>MEgGP  
{ p%ve1>c  
 UpdateData(); VR'R7  
 UCHAR mask=0; GR%h3HO2&  
 UCHAR key=0; XCo3pB Wq~  
 if(m_bControl) VZhHO d  
  mask|=4; d~ |/LR5  
 if(m_bAlt) 0gIJ&h6*f  
  mask|=2; ?q*,,+'0  
 if(m_bShift) PLV-De  
  mask|=1; $2kZM4  
  key=Key_Table[m_Key.GetCurSel()]; ]%Db%A  
 if(bRegistered){ :`Z'vRj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); m9Pzy^g1  
  bRegistered=FALSE; ,f[`C-\Q%  
 } 3* v&6/K  
 cMask=mask; C"gH>G  
 cKey=key; gP 13n!7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '(6 ^O=  
 return bRegistered; >V,i7v*?  
} SjmWlf,  
2[V9`r8*  
  四、小结 qQ{i2D%)?f  
+YX *.dW  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五