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
  • 7963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: bcvm]aPu  
   ^|zag  
  一、实现方法 qy.$5-e:[9  
UCjx   
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: /;w(sU  
%o4v} mzV  
#pragma data_seg("shareddata") uYWgNNxdmo  
HHOOK hHook =NULL; //钩子句柄 }y+Qj6dP  
UINT nHookCount =0; //挂接的程序数目 ZA. S X|m  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j1qU 4#Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 &zB>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ja~Dp5  
static int KeyCount =0; ! [1aP,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U?Dr0wD;[  
#pragma data_seg() /O.Ql ,6[  
rQlQ^W$=?  
  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。 +TA~RC d  
7P(jMalq  
  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: N%>h>HJ  
t_xK?``  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR M*qE)dZjS  
cKey,UCHAR cMask) szhSI  
{ DZ\ '7%c  
 BOOL bAdded=FALSE; wu eDedz\  
 for(int index=0;index<MAX_KEY;index++){ E9>z.vV   
  if(hCallWnd[index]==0){ Lfcy#3!  
   hCallWnd[index]=hWnd; IDJ2epW*;  
   HotKey[index]=cKey; ^X+qut+~  
   HotKeyMask[index]=cMask; [e ztu9  
   bAdded=TRUE; gm,AH85  
   KeyCount++; i ]8bj5j{  
   break; ^^7@kh mNl  
  } mD.6cV  
 } {]8|\CcY?  
 return bAdded; $#+D:W)az  
} 7g]mrI@  
//删除热键 &y1iLk h^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <XG]aYBR  
{ 9 Xl#$d5  
 BOOL bRemoved=FALSE; 6{^\7`  
 for(int index=0;index<MAX_KEY;index++){ +D4m@O  
  if(hCallWnd[index]==hWnd){ t3?I4HQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #9r}Kr=P  
    hCallWnd[index]=NULL; 2)}*'_E9  
    HotKey[index]=0; zSD_t  
    HotKeyMask[index]=0; sRZ<c  
    bRemoved=TRUE; :<B_V<  
    KeyCount--; $z*"@  
    break; ,g}$u'A+d  
   } "= %"@"<)  
  } jUNt4  
 } ](Wa:U}Xs  
 return bRemoved; l3ogMRq@  
} Kw;gQk~R!  
"0Z /|&  
=y@0i l+V  
  DLL中的钩子函数如下: 8@LWg d  
x:~XZX\mwH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Rvu5#_P  
{ %Rf9 KQ  
 BOOL bProcessed=FALSE; =^rp= Az  
 if(HC_ACTION==nCode) $V`1<>4  
 { csLbzDg  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1Dc6v57  
   switch(wParam) 5yK#;!:h  
   {  d9U)O6=  
    case VK_MENU: kZF<~U  
     MaskBits&=~ALTBIT; c%hXj#;  
     break; L[9Kh&c  
    case VK_CONTROL: R31Z(vY  
     MaskBits&=~CTRLBIT; Yb<:1?76L  
     break; 0AffD:  
    case VK_SHIFT: <F&XT@  
     MaskBits&=~SHIFTBIT; o938!jML_  
     break; \WTKw x  
    default: //judge the key and send message 6@/k|t>OT  
     break; 7- LjBlH  
   } MG.c`t/w  
   for(int index=0;index<MAX_KEY;index++){ s+fxv(,"c  
    if(hCallWnd[index]==NULL) <yEApWd;  
     continue; 7<)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &xB9;v3  
    { xrBM`Bj0@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0{ B<A^Bf  
     bProcessed=TRUE; j2IK\~W?-  
    } BI-'&kPk  
   } o[ks-C>jw  
  } #o} /'  
  else if((lParam&0xc000ffff)==1){ //有键按下 WvJ:yUb2  
   switch(wParam) b:~#;$g  
   { .'H$|"( v  
    case VK_MENU: :;hg :Q:  
     MaskBits|=ALTBIT; [sk n9$  
     break; ({C[RsY=6  
    case VK_CONTROL: p.8  
     MaskBits|=CTRLBIT; !lFNG:&`  
     break; `i(b%$|^&Z  
    case VK_SHIFT: nXhP ME  
     MaskBits|=SHIFTBIT; B=n90XO |  
     break; j #: ARb  
    default: //judge the key and send message p6BDhT(RS  
     break; xFThs,w  
   } Z8ivw\|M8  
   for(int index=0;index<MAX_KEY;index++){ tKe-Dk9  
    if(hCallWnd[index]==NULL) 9)S3{i6w  
     continue; zb4@U=?w}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +2eri_p  
    { B[7,Hy,R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); yF6AI@y  
     bProcessed=TRUE; |XG&[TI- "  
    } -V~Fj~b#  
   } pL[3,.@WA  
  } $G)HU6hF*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #&r}J  
   for(int index=0;index<MAX_KEY;index++){ CP2wg .  
    if(hCallWnd[index]==NULL) r_Ou\|jU  
     continue; 4OJD_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u ynudO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zY*~2|q,s  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Cc{{9Ud  
   } $,/E"G`  
  } N3\RXXY  
 } 2p;I<C:Eo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H? z~V-8  
} 2BF455e   
3J 5,V  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: `<v$+mG  
>\:GFD{z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xq,ql@7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rA?< \*  
dwUDhQt3Q  
  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: +UX~'t_'v  
<+ [N*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =$y J66e  
{ )nj fqg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >2),HZp^I  
 { OS<GAA0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6m]?*k1HC  
  SaveBmp(); w[ 3a^  
  return FALSE; t&w.Wc X)  
 } ~&ns?z>x  
 …… //其它处理及默认处理 /E\04Bs  
} (*6 .-Xn  
2-Q5l*  
rf]z5;  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 SYsO>`/ )  
WH39=)D%u  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 i g7|kl  
*! :j$n;  
  二、编程步骤 jwLZC  
d(RMD  
  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"; f2o6GC_  
,aS+RJNM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1c]{rO=taN  
u]O}Ub`  
  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; GKF!GbGR@  
4 Cd5-I  
  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; 7_jt =sr  
mM?,e7Xhs  
  5、 添加代码,编译运行程序。 <{;'0> ToM  
@oH\r-jsgu  
三、程序代码 .XeZjoJ$z  
&3"ODAp'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7\yh(+kN  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W vu 1?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \zk>cQ  
#if _MSC_VER > 1000 F{Yr8(UHA  
#pragma once 9-_Lc<  
#endif // _MSC_VER > 1000 q&?hwX Z7  
#ifndef __AFXWIN_H__ AsuugcN*  
#error include 'stdafx.h' before including this file for PCH z(.,BB[  
#endif ^["D>@yIR  
#include "resource.h" // main symbols I!9>"s12  
class CHookApp : public CWinApp r|uR!=*|?  
{ N>a~k}pPH  
 public: ^q& Rl\  
  CHookApp(); N\.g+ W  
  // Overrides "'Gq4<&y  
  // ClassWizard generated virtual function overrides F,VWi$Po\N  
  //{{AFX_VIRTUAL(CHookApp) \/SOpC  
 public: SD%3B!cpX  
  virtual BOOL InitInstance(); Fz<1xyc(  
  virtual int ExitInstance(); .9z}S=ZK  
  //}}AFX_VIRTUAL 1~E4]Ef:W  
  //{{AFX_MSG(CHookApp) ft@#[Bkx  
  // NOTE - the ClassWizard will add and remove member functions here. Y?K?*`Pkc1  
  // DO NOT EDIT what you see in these blocks of generated code ! .+?]"1>]  
  //}}AFX_MSG _ Dz*%  
  DECLARE_MESSAGE_MAP() >f^kp8`3{Y  
}; ) Kl@dj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .L1[Rv3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1/ j >|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (gvnIoDl0  
BOOL InitHotkey(); 3"my!}03  
BOOL UnInit(); NW;_4g4qE  
#endif >b0 Bvx-  
jjEu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dG~U3\!  
#include "stdafx.h" _PC<Td>nm  
#include "hook.h" $}S0LZ_H  
#include <windowsx.h> Yg&/^  
#ifdef _DEBUG q2`mu4B  
#define new DEBUG_NEW Ny`SE\B+/  
#undef THIS_FILE izl-GitP  
static char THIS_FILE[] = __FILE__; Jc5Y Gj7  
#endif N|@ tP:j  
#define MAX_KEY 100 @sZ' --Y  
#define CTRLBIT 0x04 }LX!dDuwA  
#define ALTBIT 0x02 99'c\[fd'  
#define SHIFTBIT 0x01 [K4 k7$  
#pragma data_seg("shareddata") .) %, R  
HHOOK hHook =NULL; KdZ=g ZSH  
UINT nHookCount =0; G eB-4img  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey KX!/n`2u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (Lj*FXmz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^j pQfDe6  
static int KeyCount =0; iDgc$'%?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift x+%> 2qgj"  
#pragma data_seg() NaQ~iY?  
HINSTANCE hins; OaoHN& "  
void VerifyWindow(); \f Kn} ]kG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ei1;@k/  
//{{AFX_MSG_MAP(CHookApp) b"td]H3h  
// NOTE - the ClassWizard will add and remove mapping macros here. pV:44  
// DO NOT EDIT what you see in these blocks of generated code! 4XiQ8"C  
//}}AFX_MSG_MAP %Y#W#G  
END_MESSAGE_MAP() q`z1ht nf  
&E!m(|6?+  
CHookApp::CHookApp() $5\sV48f  
{ <pG 4 g  
 // TODO: add construction code here, h5aPRPUg  
 // Place all significant initialization in InitInstance gth_Sz5!#  
} zt|1tU:  
tOk=m'aUK  
CHookApp theApp; #1}%=nAsi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @'hkU$N)  
{ 6Qz=g t%I=  
 BOOL bProcessed=FALSE; E/1:4?1 S  
 if(HC_ACTION==nCode) +m~3InWq  
 { 3FO-9H  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,|zwY~l t5  
   switch(wParam) Dcs O~mg  
   { #-"C_~-MH  
    case VK_MENU: p R`nQM-D  
     MaskBits&=~ALTBIT; d:]ZFk_*  
     break; T(cpU,Q  
    case VK_CONTROL: %7\l+g,  
     MaskBits&=~CTRLBIT; O\]{6+$fm!  
     break; &i`(y>\  
    case VK_SHIFT: 1`Bhis9X8  
     MaskBits&=~SHIFTBIT; }+u<w{-7/  
     break; ,ag* /  
    default: //judge the key and send message :y{@=E=XSC  
     break; ] ONmWo77o  
   } md\Vw?PkU  
   for(int index=0;index<MAX_KEY;index++){ D=5%lL  
    if(hCallWnd[index]==NULL) Gw6!cp|/  
     continue; _]3#C[1L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1guiuR4  
    { s{Y-Vdx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DmB?.l-  
     bProcessed=TRUE; hS%oQ)zvE  
    } |x _jpR  
   } q!5`9u6  
  } @K#}nKN'  
  else if((lParam&0xc000ffff)==1){ //Key down 6*|EB|%n  
   switch(wParam) { Rxb_9  
   { 7fT_]H8  
    case VK_MENU: 8r0;054  
     MaskBits|=ALTBIT; {=3'H?$  
     break; !{g>g%2!  
    case VK_CONTROL: H2+Ijn19E  
     MaskBits|=CTRLBIT; ?AI`,*^  
     break; #&K}w 0}k  
    case VK_SHIFT: &t6SI'  
     MaskBits|=SHIFTBIT; 4~nf~  
     break; E( *CEW.V*  
    default: //judge the key and send message v806f8  
     break; \vL{f;2J  
   } mv/ Nz?  
   for(int index=0;index<MAX_KEY;index++) 3|URlz  
   { @lh]? |*[  
    if(hCallWnd[index]==NULL) AuBBSk8($  
     continue; 00Ye ]j_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =C)2DWJ1  
    { e>uq/|.!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l?^}n(_.  
     bProcessed=TRUE; )g U#[}6H  
    } g+4x  
   } ue!4By8T  
  } N{Pa&/V  
  if(!bProcessed){ 7< ?Aou  
   for(int index=0;index<MAX_KEY;index++){ n2'XWbMaL  
    if(hCallWnd[index]==NULL) bK!uR&i^l  
     continue; hb)83mH}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  [cfXcl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,x[~|J!  
   } X:(t,g*7  
  } iE ,"YCK  
 } 2ryg3% +O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /(}YjeS  
} NZXCaciG  
-Ji uq  
BOOL InitHotkey() PL3oV<\4s>  
{ 1n>AN.nI  
 if(hHook!=NULL){ |B\76Nk  
  nHookCount++; {q);1Nnf  
  return TRUE; eQ =6< ^KZ  
 } 9A\\2Zz6F  
 else AC?a:{ ./  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]==S?_.B3n  
  if(hHook!=NULL) {'?PGk%v  
   nHookCount++; 97}l`z;Z  
  return (hHook!=NULL); .&KC2#4   
} O%} hNTS"  
BOOL UnInit() @< 0c  
{ 1w 9zl}  
 if(nHookCount>1){ @Ps1.  
  nHookCount--; qFY>/fCP4  
  return TRUE; Te>m9Pav  
 } sA,2gbW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); PiNf;b^9  
 if(unhooked==TRUE){ =cx_3gCr{  
  nHookCount=0; lO1]P&@  
  hHook=NULL; `;s#/`c|/  
 } o4B%TW  
 return unhooked; CL!s #w1I\  
} 0y;1D k!  
reNUIDt/c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z&.F YGq}  
{ 7wbpQ&1_  
 BOOL bAdded=FALSE; aSfAu!j)  
 for(int index=0;index<MAX_KEY;index++){ Nqbm,s  
  if(hCallWnd[index]==0){ #BI Z|  
   hCallWnd[index]=hWnd; >H]|R }h  
   HotKey[index]=cKey; <7MxI@\  
   HotKeyMask[index]=cMask; :*tFW~<*b  
   bAdded=TRUE; !WD^To  
   KeyCount++; A=wh&X  
   break; msZ 3%L  
  } ~8lB#NuN  
 } m{ rsjdnA  
 return bAdded; #\3X;{  
} ev5m(wR  
0(^ N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $ 3.Y2&$T  
{ Y0o{@)Y:  
 BOOL bRemoved=FALSE; eqU y>  
 for(int index=0;index<MAX_KEY;index++){ R, U YwI  
  if(hCallWnd[index]==hWnd){ 7)x 788Z6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :CXm@yF~4=  
    hCallWnd[index]=NULL; f(c#1AJE53  
    HotKey[index]=0; mqQC`Aqx:  
    HotKeyMask[index]=0; @dhnpR :L  
    bRemoved=TRUE; 6J3<k(#:  
    KeyCount--; 'u:J "  
    break; 8+&Da  
   } D [K!xq  
  } edfb7prfTl  
 } mf gUf  
 return bRemoved; lnrs4s Km  
} =n_>7@9l  
&^F'ME  
void VerifyWindow() z3|5E#m  
{ *7yrm&@nG  
 for(int i=0;i<MAX_KEY;i++){ )H*BTfmt  
  if(hCallWnd!=NULL){ ded:yho   
   if(!IsWindow(hCallWnd)){ )p 8P\Rl  
    hCallWnd=NULL;  ]l=iKl  
    HotKey=0; F%:o6mT  
    HotKeyMask=0; 6LzN#g  
    KeyCount--; g_(O7  
   } w+{ o^ O  
  } C ?aa)H  
 } #>">fs]  
} N/8B@}@n  
Oa' T$'  
BOOL CHookApp::InitInstance() f2i9UZ$=e!  
{ eOUEhpE  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); PED5>90  
 hins=AfxGetInstanceHandle(); X[1w(dU[  
 InitHotkey(); ##yH*{/&  
 return CWinApp::InitInstance(); zQsW*)L  
} RnUud\T/  
hJ*#t<.<P;  
int CHookApp::ExitInstance() >d^DN;p  
{ d PF*G$  
 VerifyWindow(); .2*h!d)E  
 UnInit(); 7_5-gtD  
 return CWinApp::ExitInstance(); Mdy4H[Odq  
} ZtOv'nTD  
1,pPLc(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file VJ-To}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cwI3ANV  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bMN ]co  
#if _MSC_VER > 1000 :}Z Y*ind  
#pragma once ~Z$Ro/;l  
#endif // _MSC_VER > 1000 E.^F:$2  
ZE6W"pbjU  
class CCaptureDlg : public CDialog L=kETJ:g  
{ $`"$ZI6[  
 // Construction 8:"s3xaO3  
 public: md /NMC \  
  BOOL bTray; x UTlM  
  BOOL bRegistered; r<_qU3Eaj  
  BOOL RegisterHotkey(); l#3jJn  
  UCHAR cKey; #}C6}};  
  UCHAR cMask; ME'LZ"VT  
  void DeleteIcon(); 5DVSaI$ =  
  void AddIcon(); k, jcLX.  
  UINT nCount; ePiZHqIsv/  
  void SaveBmp(); c^}DBvG,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4siq  
  // Dialog Data ryt`yO  
  //{{AFX_DATA(CCaptureDlg) /3qKsv#  
  enum { IDD = IDD_CAPTURE_DIALOG }; @BI;H V%k  
  CComboBox m_Key; ~p\r( B7G  
  BOOL m_bControl; )W!\D/C+  
  BOOL m_bAlt; ic?(`6N8  
  BOOL m_bShift; U/>l>J5  
  CString m_Path; W%< z|  
  CString m_Number; fWl #CI\]  
  //}}AFX_DATA 3F{R$M}  
  // ClassWizard generated virtual function overrides MZdj!(hO  
  //{{AFX_VIRTUAL(CCaptureDlg) 7J5Yzu)D  
 public: } v3w-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); o:lMRP~  
 protected: 2:&QBwr+;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9mB] \{^  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  ~5n?=  
  //}}AFX_VIRTUAL (kSb74*g  
  // Implementation Vu Ey`c  
 protected: 1cd3m  
  HICON m_hIcon; FdS'0#$  
  // Generated message map functions jluv}*If  
  //{{AFX_MSG(CCaptureDlg) 5ih5=qX  
  virtual BOOL OnInitDialog(); $!\Z_ :  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }}4uLGu)  
  afx_msg void OnPaint(); i6xzHfaYG  
  afx_msg HCURSOR OnQueryDragIcon(); G3.\x_;k  
  virtual void OnCancel(); So}pA2[0  
  afx_msg void OnAbout(); $~'G<YYF4  
  afx_msg void OnBrowse(); Ej$oRo{ IG  
  afx_msg void OnChange(); Nq[-.}Z6  
 //}}AFX_MSG \N)!]jq  
 DECLARE_MESSAGE_MAP() cs)R8vuB)z  
}; qDjH^f  
#endif -hZw.eChQa  
]t_ Wl1*|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vW5>{  
#include "stdafx.h" hj=k[t|g}  
#include "Capture.h" ZKVM9ofXRi  
#include "CaptureDlg.h" (FSa>  
#include <windowsx.h> !1`f84d  
#pragma comment(lib,"hook.lib") P&AaD!Qn  
#ifdef _DEBUG j`_tb   
#define new DEBUG_NEW {5JYu  
#undef THIS_FILE ) {4$oXQ  
static char THIS_FILE[] = __FILE__; jN!sL W  
#endif ``Rg0o  
#define IDM_SHELL WM_USER+1 ^2"w5F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %WtF\p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x=V3_HI/}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >* ]B4Q  
class CAboutDlg : public CDialog ,-1d2y  
{ M0woJt[&  
 public: q`HK4~i,  
  CAboutDlg(); __)"-\w-_(  
  // Dialog Data ,~XAV ;+  
  //{{AFX_DATA(CAboutDlg) G+K`FUNA  
  enum { IDD = IDD_ABOUTBOX }; 0D}k ^W  
  //}}AFX_DATA .zvvk  
  // ClassWizard generated virtual function overrides J&;' gT  
  //{{AFX_VIRTUAL(CAboutDlg) 5 $. az  
 protected: t CQf `  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X'usd$[ .  
  //}}AFX_VIRTUAL uo7[T*<Q  
  // Implementation ^*WO*f>y  
 protected: 5[H1nC @C  
  //{{AFX_MSG(CAboutDlg) 3IQ-2 X--  
  //}}AFX_MSG 9oVprd >%@  
  DECLARE_MESSAGE_MAP() pB,l t6  
}; +(oExp(!  
&}VVr  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,UneS  
{ q5>!.v   
 //{{AFX_DATA_INIT(CAboutDlg) [`bA,)y"  
 //}}AFX_DATA_INIT AnQUdU  
} -9$.&D|  
Bx0=D:j  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _>G=xKA#e  
{ M>@PRb:Oc  
 CDialog::DoDataExchange(pDX); +e&Q<q!,q  
 //{{AFX_DATA_MAP(CAboutDlg) f&C]}P  
 //}}AFX_DATA_MAP c5t7X-LB  
} O,0j+1?  
`&SBp }W}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /.:&9 c  
 //{{AFX_MSG_MAP(CAboutDlg) -nnAe F  
 // No message handlers 3s_$.  
 //}}AFX_MSG_MAP |/!RN[<   
END_MESSAGE_MAP() )D ':bWP  
h~k+!\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _j|U>s   
: CDialog(CCaptureDlg::IDD, pParent) HvW6=d(#  
{ '.#3h$d  
 //{{AFX_DATA_INIT(CCaptureDlg) b%e7rY2  
  m_bControl = FALSE; l,ra24  
  m_bAlt = FALSE; d 2z!i^:  
  m_bShift = FALSE; r%%<   
  m_Path = _T("c:\\"); (sEZNo5n  
  m_Number = _T("0 picture captured."); i^V3u  
  nCount=0; fs*OR2YG7  
  bRegistered=FALSE; +}NQ |y V  
  bTray=FALSE; zO3}c3D~q  
 //}}AFX_DATA_INIT Tnb5tHjnh  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 M/jdMfU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 42wZy|oqp  
} H2E'i\  
-<^3!C >  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) '#CYw=S+  
{ PfJfa/#pA  
 CDialog::DoDataExchange(pDX); TU?$yNE  
 //{{AFX_DATA_MAP(CCaptureDlg) {-L}YX"Bh  
  DDX_Control(pDX, IDC_KEY, m_Key); ~0 Mw\p%}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _&PF(/w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _cQhT  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9f$3{ g{m  
  DDX_Text(pDX, IDC_PATH, m_Path); {EVHkQ+o  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xd]7?L@h.I  
 //}}AFX_DATA_MAP _ Zzne  
} ybpU?n  
q ?m<9`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z A@w[.  
//{{AFX_MSG_MAP(CCaptureDlg) dt(Lp_&v  
 ON_WM_SYSCOMMAND() #YB3Ug]z  
 ON_WM_PAINT() )!d_Td\-  
 ON_WM_QUERYDRAGICON() hr/|Fn+kA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _kQOax{c/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0Y/k /)Ul]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ou [Wz{  
//}}AFX_MSG_MAP NucLf6  
END_MESSAGE_MAP() . "`f~s\G  
OZE.T-{  
BOOL CCaptureDlg::OnInitDialog() E# *`u  
{ dlc'=M  
 CDialog::OnInitDialog(); c.h_&~0qf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .,gVquqMY  
 ASSERT(IDM_ABOUTBOX < 0xF000); :/i13FQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ~{!,ZnO*  
 if (pSysMenu != NULL) j4Y] 8  
 { zWf(zxGAz  
  CString strAboutMenu; 9v76A~~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); mH!\]fmR~  
  if (!strAboutMenu.IsEmpty()) )|<g\>/  
  { =<z~OE'lV  
   pSysMenu->AppendMenu(MF_SEPARATOR); RJLhR_t7n  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); SNtOHTQ  
  } T$s)aM  
 } eEg> EI_U  
 SetIcon(m_hIcon, TRUE); // Set big icon /5C>7BC  
 SetIcon(m_hIcon, FALSE); // Set small icon +!<{80w  
 m_Key.SetCurSel(0); jx8hh}C  
 RegisterHotkey(); gEnc;qb  
 CMenu* pMenu=GetSystemMenu(FALSE); r%^XOw<'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _O"C`]]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [,q^\T  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %YI!{  
 return TRUE; // return TRUE unless you set the focus to a control hVu~[ 'Me  
} $lf\1)B~*  
cb9@ 0^-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;V)94YT  
{ %)j^>W5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dhI+_z   
 { mbZ g2TTy  
  CAboutDlg dlgAbout; q@iZo,Yk  
  dlgAbout.DoModal(); l[{Ci|4  
 } o)Nm5g  
 else 5C"A*Fg?;  
 { 2T}FX4'  
  CDialog::OnSysCommand(nID, lParam); *mfPq"/  
 } Aq{7WA  
} a: [m;  
UJGmaE  
void CCaptureDlg::OnPaint() a8r+G]Z  
{ StM)lVeF  
 if (IsIconic()) pqxBu  
 { DP4l %2m0  
  CPaintDC dc(this); // device context for painting 0/?=FM >  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k{pn~)xg  
  // Center icon in client rectangle {m 5R=22^  
  int cxIcon = GetSystemMetrics(SM_CXICON); LX iis)1  
  int cyIcon = GetSystemMetrics(SM_CYICON); ? p^':@=  
  CRect rect; Y# ?M%I%j  
  GetClientRect(&rect); v*EErQML8b  
  int x = (rect.Width() - cxIcon + 1) / 2; _@ @"'  
  int y = (rect.Height() - cyIcon + 1) / 2; cUM#|K#6  
  // Draw the icon Fj0h-7L  
  dc.DrawIcon(x, y, m_hIcon); }}~ t! /x  
 } z;[Z'_B  
 else btIh%OM  
 { C'CdVDm X  
  CDialog::OnPaint(); R86:1  
 } [LHfH3[gU  
} %~YQl N  
9/LJ tM  
HCURSOR CCaptureDlg::OnQueryDragIcon()  B<?fD  
{ >?0f>I%\  
 return (HCURSOR) m_hIcon; D_Cd^;b  
} 6Pu5 k;H  
nv"D  
void CCaptureDlg::OnCancel() ?c# v'c^=h  
{ Y%]&h#F  
 if(bTray) Cr%6c3aQ  
  DeleteIcon(); "Kt[jV;6  
  CDialog::OnCancel(); 8??%H7~  
} qGc>+!y  
MA5BTq<&  
void CCaptureDlg::OnAbout() ?3Dsz  
{ A49HYX-l  
 CAboutDlg dlg; K>fY9`Whm  
 dlg.DoModal(); O{`r.H1',  
} CF+:9PG  
.=-K7.X.)  
void CCaptureDlg::OnBrowse() b-,]21  
{ Z  )dz  
 CString str; ,R;wk=k  
 BROWSEINFO bi; OQZ\/~o 5  
 char name[MAX_PATH]; EL-1o0 2-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7U{g'<  
 bi.hwndOwner=GetSafeHwnd(); [!E~pW%|n  
 bi.pszDisplayName=name; D^W?~7e ^r  
 bi.lpszTitle="Select folder"; I@9k+JB   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; OM 5h>\9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _"#ucM=B:-  
 if(idl==NULL) B#;yko  
  return; _fQBXG2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eA(c{  
 str.ReleaseBuffer(); J#'+&D H  
 m_Path=str; SgocHpyg  
 if(str.GetAt(str.GetLength()-1)!='\\') obhq2sK  
  m_Path+="\\"; d6hso  
 UpdateData(FALSE); h *-j  
} =1Mh %/y  
$I-i=:}g  
void CCaptureDlg::SaveBmp() jNA^ (|:  
{ d>qxaX;  
 CDC dc; #.n%$r  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <xeo9'k6&  
 CBitmap bm; y*5bF 0  
 int Width=GetSystemMetrics(SM_CXSCREEN); B?tO&$s  
 int Height=GetSystemMetrics(SM_CYSCREEN); )#l,RJ(  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @7aSq-(_l*  
 CDC tdc; _ s[v:c  
 tdc.CreateCompatibleDC(&dc); zn|/h,.  
 CBitmap*pOld=tdc.SelectObject(&bm); *qm@;!C  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /N&)r wc  
 tdc.SelectObject(pOld); Z[{: `  
 BITMAP btm; -dn\*n5  
 bm.GetBitmap(&btm); )gR !G]Y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :h+gSvn:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X6dv+&=?  
 BITMAPINFOHEADER bih; e-#!3j!'  
 bih.biBitCount=btm.bmBitsPixel; 7}<05 7Xn'  
 bih.biClrImportant=0; s$ 2@|;  
 bih.biClrUsed=0; e.|_=Gd2/  
 bih.biCompression=0; Sy<s/x^`  
 bih.biHeight=btm.bmHeight; 4W''j[Y/  
 bih.biPlanes=1; ,,>b=r_r&  
 bih.biSize=sizeof(BITMAPINFOHEADER); *.DTcV  
 bih.biSizeImage=size; Lh5d2}tcO  
 bih.biWidth=btm.bmWidth; kWgZIkY  
 bih.biXPelsPerMeter=0; -v(.]`Wo&;  
 bih.biYPelsPerMeter=0; &<E*W*b[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w&7-:."1i  
 static int filecount=0; 8f<[Bu ze  
 CString name; 058+_xX  
 name.Format("pict%04d.bmp",filecount++); Gq/f|43}@O  
 name=m_Path+name; @ 0RB.-  
 BITMAPFILEHEADER bfh; iZ3%'~K<3J  
 bfh.bfReserved1=bfh.bfReserved2=0; Q7 Clr{&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); C  +%&!Q  
 bfh.bfSize=54+size; =wW3Tr7~  
 bfh.bfOffBits=54; ![BQ;X  
 CFile bf; .hxcx>%  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ THM\-abz  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m18If  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xNh#=6__9  
  bf.WriteHuge(lpData,size); =U5lPsiv,3  
  bf.Close(); xED`8PCfu  
  nCount++; 8@|rB3J  
 } t4H@ZvAH0  
 GlobalFreePtr(lpData); |QvG;{!  
 if(nCount==1) {zc<:^r^  
  m_Number.Format("%d picture captured.",nCount); 6"Km E}  
 else _ s]=g  
  m_Number.Format("%d pictures captured.",nCount); heliL/  
  UpdateData(FALSE); ~iZMV ?w  
} btK| U  
# Pulbk8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @]#0jiS  
{ G w$sL&1m\  
 if(pMsg -> message == WM_KEYDOWN) @JWoF^U  
 { aNpeePF)z  
  if(pMsg -> wParam == VK_ESCAPE) :H$D-pbJ4  
   return TRUE; 6N&S3<c4JO  
  if(pMsg -> wParam == VK_RETURN) $GyO+xF  
   return TRUE; _ G!lQ)1  
 } [y73 xF   
 return CDialog::PreTranslateMessage(pMsg); .oq!Ys4KA  
} bqXCe\#  
AFWcTz6#d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Hb3+$vJ^  
{ Q)c $^YsI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HV`{YuP  
  SaveBmp(); -}m#uUqI  
  return FALSE; *=1;HN3  
} FX"%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ EOrWax@k$}  
 CMenu pop; ujZki.x  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xa`&/W>  
 CMenu*pMenu=pop.GetSubMenu(0); ]],6Fi+  
 pMenu->SetDefaultItem(ID_EXITICON); U A T46  
 CPoint pt; _7YAF,@vT  
 GetCursorPos(&pt); C|Bk'<MI  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zYdSg<[^  
 if(id==ID_EXITICON) ~F*pV*  
  DeleteIcon(); sB_o HUMH6  
 else if(id==ID_EXIT) !ZbNW4rIP  
  OnCancel(); ]<q{0.  
 return FALSE; PNXZ3:W  
} J.:"yK""  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =iRi 9r'l  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) I]>-~_  
 AddIcon(); YH^_d3A;  
 return res; d3T|N\(DL  
} (| Am  
}$V]00 X  
void CCaptureDlg::AddIcon() 5j`"@C5;O  
{ Phl't~k  
 NOTIFYICONDATA data; k0?4vA  
 data.cbSize=sizeof(NOTIFYICONDATA); _Kx  /z  
 CString tip; S(5.y%"<  
 tip.LoadString(IDS_ICONTIP); iYA06~ d  
 data.hIcon=GetIcon(0); $nQ; ++  
 data.hWnd=GetSafeHwnd(); Q{!lLka  
 strcpy(data.szTip,tip);  M}}9  
 data.uCallbackMessage=IDM_SHELL; qt}vM*0}V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; } 1w[G;$  
 data.uID=98; N{`-&8q;K  
 Shell_NotifyIcon(NIM_ADD,&data); ?rWqFM:hb  
 ShowWindow(SW_HIDE); !h7`W*::  
 bTray=TRUE; :7IL|bA<  
} P"_x/C(]@J  
&by,uVb=|{  
void CCaptureDlg::DeleteIcon() 71cc6T  
{ ?]f+)tCMs  
 NOTIFYICONDATA data; (o{-1Dg)  
 data.cbSize=sizeof(NOTIFYICONDATA); F8Y D:   
 data.hWnd=GetSafeHwnd(); uJMF\G=nb  
 data.uID=98; $Ha?:jSc  
 Shell_NotifyIcon(NIM_DELETE,&data); e%N\Pshgv  
 ShowWindow(SW_SHOW); m:/@DZ  
 SetForegroundWindow(); "j3Yu4_ks  
 ShowWindow(SW_SHOWNORMAL); |Wj)kr !|  
 bTray=FALSE; SxC$EQ gL  
} $I-$X?  
N7%Jy?-+  
void CCaptureDlg::OnChange() bXc7$5(!VB  
{ @g[p>t> *  
 RegisterHotkey(); GY<Y,  
} *-Y77p7u  
P$2J`b[H$  
BOOL CCaptureDlg::RegisterHotkey() 2Y&z}4'j  
{ ,]~iIoTi  
 UpdateData(); v*QobI  
 UCHAR mask=0; ):&A\nb  
 UCHAR key=0; Q <^'v>~n  
 if(m_bControl) b.h~QyI/W  
  mask|=4; kX\t0'=]  
 if(m_bAlt) J7emoD [  
  mask|=2; ,Zzh.z::D  
 if(m_bShift) %fh ,e5(LT  
  mask|=1; =9y'6|>l  
  key=Key_Table[m_Key.GetCurSel()]; ;%]Q%7  
 if(bRegistered){ \ Yz>=rY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =]\,I'  
  bRegistered=FALSE; DkA cT[  
 } _+wou(1y  
 cMask=mask; CCp{ZH s  
 cKey=key; m'r6.Hp3Ng  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >AV-i$4eQ@  
 return bRegistered; xv's52x  
} %H~q3|z  
=nA;,9%  
  四、小结 B!! xu  
%#02Z%?%  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五