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
  • 3524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: 3_bE12  
  SFu]*II;{  
  一、实现方法 FR9w0{o  
HNJR&U t  
  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: gmUXh;aHc  
?rm3Iac0S  
#pragma data_seg("shareddata") NX[-Y]t  
HHOOK hHook =NULL; //钩子句柄 tJG+k)EE  
UINT nHookCount =0; //挂接的程序数目 HLe/|x\@<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &\>=4)HB;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }/w]+f*  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m?< ^b_a}  
static int KeyCount =0; ~8 B]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 f+ cN'jH E  
#pragma data_seg() 3"BSP3/ [l  
LR "=(  
  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。 ZZ>"LH  
`@q\R-`  
  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: oF0DprP@  
U{\9mt7b!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ["O_ Phb|  
cKey,UCHAR cMask) ZveNe~D7C  
{ `q9n`h1  
 BOOL bAdded=FALSE; eMV{rFmT  
 for(int index=0;index<MAX_KEY;index++){ k vpkWD;  
  if(hCallWnd[index]==0){ ZaBmH|k  
   hCallWnd[index]=hWnd; )x,/+R]{8l  
   HotKey[index]=cKey; 2tb+3K1  
   HotKeyMask[index]=cMask; u`.3\Geh  
   bAdded=TRUE; 4s e6+oJe  
   KeyCount++; SK5_^4  
   break; 3'Hz,qP  
  } ZEp>~dn;  
 } KE4#vKV0yC  
 return bAdded; qyBC1an5,  
} ~.tl7wKkR/  
//删除热键 ^e]O-,UBk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) csd9[=HW/Q  
{ eZ oAy[  
 BOOL bRemoved=FALSE; <NEz{1Z  
 for(int index=0;index<MAX_KEY;index++){ =@nE:uto]  
  if(hCallWnd[index]==hWnd){ k:&vW21E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yq?\.~ax  
    hCallWnd[index]=NULL; ?I8r2M]  
    HotKey[index]=0; .=)[S5.BVq  
    HotKeyMask[index]=0; ~,_@|,)  
    bRemoved=TRUE; BbM/Rd1tAm  
    KeyCount--; 1V wcJd  
    break; AdpJ4}|0  
   } gg/ts]$  
  } YQ@2p?4m  
 } p"FWAC!  
 return bRemoved; EKD#s,(V*X  
} v, CWE  
[_KV;qS%/  
S n<X   
  DLL中的钩子函数如下: B^!-%_q  
-e_|^T"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QE8 `nMf  
{ .l hS  
 BOOL bProcessed=FALSE; ,1g_{dMx  
 if(HC_ACTION==nCode) ?@z/#3b  
 { aX~Jk >a0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 V.9p4k`  
   switch(wParam) 7|o!v);uR  
   {  lUaJC'~p  
    case VK_MENU: 33 S CHQ  
     MaskBits&=~ALTBIT; cV"Ov@_.k  
     break; 3GNcnb  
    case VK_CONTROL: z9:yt5ar  
     MaskBits&=~CTRLBIT; jXVvVv  
     break; H+562W  
    case VK_SHIFT: #sg*GK+|:R  
     MaskBits&=~SHIFTBIT; Yi]`"\  
     break; kS35X)-  
    default: //judge the key and send message j 7^A%9  
     break; t-5K dLB  
   } !g`I*ZE+e  
   for(int index=0;index<MAX_KEY;index++){ w=CzPNRHH!  
    if(hCallWnd[index]==NULL) p>O/H1US;  
     continue; qDTdYf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n|pdYe8\  
    { *T#^|<.XG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &qK:LHhj  
     bProcessed=TRUE; : h(Z\D_  
    } F\hVunPVx  
   } 6yBd9=3K  
  } c3Gy1#f:#2  
  else if((lParam&0xc000ffff)==1){ //有键按下 pH2/." zE<  
   switch(wParam) D)bL;h  
   { xFekSH7[F  
    case VK_MENU: 6O/c%1VHA3  
     MaskBits|=ALTBIT; L+VQtp &"  
     break; SuB8mPn  
    case VK_CONTROL: "G-h8IN^O  
     MaskBits|=CTRLBIT; kxN O9w  
     break; Ozhn`9L+1!  
    case VK_SHIFT: 98)C 7N'  
     MaskBits|=SHIFTBIT; xmEom  
     break; ?:M4GY" gV  
    default: //judge the key and send message AAs&P+;  
     break; zRa2iCi  
   } ar\ K8mj  
   for(int index=0;index<MAX_KEY;index++){ *7-rm  
    if(hCallWnd[index]==NULL) @e&0Wk  
     continue; }zS5o [OE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j:qexhtho  
    { o$Ylqb#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9pPLOXr ,  
     bProcessed=TRUE; [= BMvP5  
    } n*Dn{ 7v#z  
   } 'l`prp3  
  } ?G,gPb  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !zm;C@}ln  
   for(int index=0;index<MAX_KEY;index++){ _G-y{D_S&  
    if(hCallWnd[index]==NULL) u]7wd3(  
     continue; dWQB1Y*N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !V(r p80  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s*_fRf:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dHTx^1  
   } -Ci&h  
  } ^iBIp#  
 } )`(]jx!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cC>Svf[CzK  
} TTFs|T6`q  
~".@;Q  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Zhv%mUj~  
VH~YwO!x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7)Vbp--b#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i\l}M]Z#  
<xF]ca  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^e <E/j{~  
K6 >\4'q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0 }qlZFB  
{ @MB)B5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0ug&HEl_w  
 { Z]R#F0"U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qB,0(I1-!  
  SaveBmp(); zRD-[Z/-  
  return FALSE; H8[A*uYL  
 } uSRhIKy  
 …… //其它处理及默认处理 A)3H`L  
} ?>7-a~*A@  
a*LfT<hmU3  
0+$gR~^^  
  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。 s2NBYDi$?  
1%*\*z  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 G`kz 0Vk  
U|Gy9"  
  二、编程步骤 Uavl%Q  
PU,$YPrZ  
  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"; 8{/.1:  
D>7J[ Yxg-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M-@X&b m,S  
N) _24  
  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; 7L6L{~8 W  
] uyp 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; (DY[OIHI  
H\a"=&M  
  5、 添加代码,编译运行程序。 \.O&-oi  
Wh| T3&  
三、程序代码 /z4c>)fV  
S} OO)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL dd<l;4(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~gff{Nzk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;h+~xxu=X  
#if _MSC_VER > 1000 [RN]?,  
#pragma once 5|*`} ;/y  
#endif // _MSC_VER > 1000 Gj-nT N  
#ifndef __AFXWIN_H__ e%L[bGW'  
#error include 'stdafx.h' before including this file for PCH [%^sl>,7  
#endif C$PS@4'U  
#include "resource.h" // main symbols 'UWkJ2:!  
class CHookApp : public CWinApp {9}CU~R  
{ oC49c~`8  
 public:  jF0"AA  
  CHookApp(); 1<73uR&b%  
  // Overrides `MuX/ [q  
  // ClassWizard generated virtual function overrides 65qqs|&w;[  
  //{{AFX_VIRTUAL(CHookApp) _Iav2= 0Wi  
 public: } v:YSG  
  virtual BOOL InitInstance(); -yc YQ~R  
  virtual int ExitInstance(); mc8Q2eQat}  
  //}}AFX_VIRTUAL !|xB>d q?  
  //{{AFX_MSG(CHookApp) t~j 6wsx;  
  // NOTE - the ClassWizard will add and remove member functions here. \q1tT!]  
  // DO NOT EDIT what you see in these blocks of generated code ! <MkvlLu((o  
  //}}AFX_MSG ~Ay)kv;  
  DECLARE_MESSAGE_MAP() HrvyI)4{  
}; fxPg"R!1i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gAdqZJR%]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0jlM~H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n.2:fk  
BOOL InitHotkey(); j\~,Gtn>Z  
BOOL UnInit(); qc @cd i  
#endif ./k7""4   
 jb&MC 2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y< *-&  
#include "stdafx.h" IJGw<cB]+  
#include "hook.h" M=uT8JB  
#include <windowsx.h> G@`F{l  
#ifdef _DEBUG HS{Vohy>  
#define new DEBUG_NEW rx2'].  
#undef THIS_FILE CL1*pL  
static char THIS_FILE[] = __FILE__; |*NZ^6`@  
#endif Ld}?daPj  
#define MAX_KEY 100 Fb]+h)on  
#define CTRLBIT 0x04 zG6l8%q'UE  
#define ALTBIT 0x02 !9_(y~g{N  
#define SHIFTBIT 0x01 ftxL-7y%  
#pragma data_seg("shareddata") 7[;!enO  
HHOOK hHook =NULL; { sC Ni  
UINT nHookCount =0; b~,e(D9DG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 196a~xNV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d'ZNp2L  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }`<&l  
static int KeyCount =0; Ph[MXb:*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift D/."0 #q  
#pragma data_seg() vnvpb! @Q  
HINSTANCE hins; "x=\mA#`  
void VerifyWindow(); .A<Hk1(-)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) t!qLgJ5%y  
//{{AFX_MSG_MAP(CHookApp) N,Ma\D+^t  
// NOTE - the ClassWizard will add and remove mapping macros here. ErK1j  
// DO NOT EDIT what you see in these blocks of generated code! f_S$CFa@  
//}}AFX_MSG_MAP 6Bjo9,L  
END_MESSAGE_MAP() }OAU5P!rp  
PO"lY'W.U  
CHookApp::CHookApp() T\}U{9ELL  
{ )dhR&@r*w  
 // TODO: add construction code here, w!20  
 // Place all significant initialization in InitInstance Ldz]FB|  
} 5;0w({1l  
B-C$>H^  
CHookApp theApp; `-pwP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?lsK?>uU  
{ .u7} p#  
 BOOL bProcessed=FALSE; =Z:] %  
 if(HC_ACTION==nCode) Th9V8Rg+E  
 { JfN5#+_i  
  if((lParam&0xc0000000)==0xc0000000){// Key up !t23 _b0  
   switch(wParam) ,]2?S5R  
   { =){ G  
    case VK_MENU: uxU-N  
     MaskBits&=~ALTBIT; xOe1v9<  
     break; UGO;5!  
    case VK_CONTROL: XMI*obS'z  
     MaskBits&=~CTRLBIT; bN. G%1  
     break; O0#[hY,  
    case VK_SHIFT: j;-Wf6h{  
     MaskBits&=~SHIFTBIT; dw<i)P^   
     break; >6 o <Q  
    default: //judge the key and send message %`&n ;K.c  
     break; p<r<Y %  
   } 7_1 Iadb  
   for(int index=0;index<MAX_KEY;index++){ )- 3~^Y#r_  
    if(hCallWnd[index]==NULL) LBy`N_@  
     continue; _  Lh0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _C/|<Ot:  
    { M?h{'$T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G7 UUx+X  
     bProcessed=TRUE; 8IlUbj  
    } $?PI>9g!  
   } |KYl'"5\  
  } kzZgNv#G;  
  else if((lParam&0xc000ffff)==1){ //Key down o&1mX  
   switch(wParam) {:gx*4}q8  
   { HqWWWCWal  
    case VK_MENU: Zmyq6.1q~  
     MaskBits|=ALTBIT; crIF5^3Yby  
     break; 9xK>fM&u  
    case VK_CONTROL: @n)? =[p  
     MaskBits|=CTRLBIT; / 3N2?zS{  
     break; ~JL qh  
    case VK_SHIFT: _VT{2`|})  
     MaskBits|=SHIFTBIT; F+H]{ss>  
     break; v8f3B<kj  
    default: //judge the key and send message @GKDSS4jv  
     break; SiaNL:  
   } Z?o0Q\ }1  
   for(int index=0;index<MAX_KEY;index++) aze#Cn,P}  
   { 'r!!W0-K  
    if(hCallWnd[index]==NULL) W/2y; @  
     continue; ]vQa~}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FFw(`[A_  
    { K]m#~J3d>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s=jmvvs_V}  
     bProcessed=TRUE; #g6_)B=S  
    } H2jypVs$2  
   } A5Jadz~  
  } %0-oZL  
  if(!bProcessed){ oT{9P?K8  
   for(int index=0;index<MAX_KEY;index++){ u* pQVU  
    if(hCallWnd[index]==NULL) 1 Gr^,Ry  
     continue; -KGJr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ExO#V9DaW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QfEJU8/5d  
   } ,9ueHE  
  } ">Qxb.Y}  
 } PL= v,NB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h~#F2#.  
} l\{Qnb(  
*,X)tZ6VX  
BOOL InitHotkey() }SSg>.48w  
{ viG=Ap.Th  
 if(hHook!=NULL){ 7-B|B{]  
  nHookCount++; r B+ (  
  return TRUE; Hj >fg2/  
 } DIGw4g4Kt  
 else 6Mc&=}bV  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fh =R  
  if(hHook!=NULL) .$-;`&0cZ  
   nHookCount++; DL bP$&o  
  return (hHook!=NULL); k$%{w\?Jf  
} #eKKH]J/  
BOOL UnInit() hD5@PeLh  
{ cY!Y?O  
 if(nHookCount>1){ m%J?5rR3  
  nHookCount--; 'Q E8  
  return TRUE; =r/K#hOR\J  
 } 6E) T;R(@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); EN`JzL jP  
 if(unhooked==TRUE){ 28^/By:J  
  nHookCount=0; G%~V b  
  hHook=NULL; |gA@$1+}  
 } :/(G#ZaV  
 return unhooked; IA0 vSF:  
} 8x1!15Wiz  
&pI\VIx ?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YTTy6*\,_  
{ E4Q`)6]0  
 BOOL bAdded=FALSE; On);SN'  
 for(int index=0;index<MAX_KEY;index++){ O])vR<[  
  if(hCallWnd[index]==0){ \)28,`  
   hCallWnd[index]=hWnd; auN8M.  
   HotKey[index]=cKey; yam'LF  
   HotKeyMask[index]=cMask; Qf0P"s`  
   bAdded=TRUE; w31O~Ve  
   KeyCount++; aN"YEL>w  
   break; :gRrM)n  
  } 2f:hz  
 } D?E VzG  
 return bAdded; puMVvo  
} AT t.}-  
Z%o.kd"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ypM,i  
{ 6 T4"m  
 BOOL bRemoved=FALSE; 'dwsm7Xd  
 for(int index=0;index<MAX_KEY;index++){ 5L6.7}B  
  if(hCallWnd[index]==hWnd){ $!G|+OuTR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VT>-*  
    hCallWnd[index]=NULL; d >L8S L  
    HotKey[index]=0; FsUH/Y y  
    HotKeyMask[index]=0;  P:6K  
    bRemoved=TRUE; 51s\)d%l  
    KeyCount--; rs4:jS$)  
    break; >%6j-:S  
   } f|~'(~Sr  
  } =X'EDw  
 } ;woK96"{t  
 return bRemoved; 1Mq"f 7X8  
} suQ`a_ zJ  
GX19GI@k  
void VerifyWindow() >7a ENKOg:  
{ fPN/Mxu  
 for(int i=0;i<MAX_KEY;i++){ %zc.b  
  if(hCallWnd!=NULL){ G{.=27  
   if(!IsWindow(hCallWnd)){ 7oLlRU  
    hCallWnd=NULL; mKM[[l&A  
    HotKey=0; Flpl,|n a  
    HotKeyMask=0; J8FzQ2  
    KeyCount--; 9i#,V@  
   } dT1UYG}>j  
  } )`k+Oyvi<  
 } ajRht +{  
} Q >yj<DR  
m?Jnb\0  
BOOL CHookApp::InitInstance() dh}"uM}a  
{ L9hL@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); m q<:^  
 hins=AfxGetInstanceHandle(); 56."&0  
 InitHotkey(); ^38k xwh  
 return CWinApp::InitInstance(); 9&kY>M>z0  
} :1'1 n  
x2~fc  
int CHookApp::ExitInstance() 5Q}HLjG8Z  
{ !bK;/)  
 VerifyWindow(); 4cm~oZ  
 UnInit(); :'t"kS  
 return CWinApp::ExitInstance(); \py&v5J)s!  
} N<(rP1)`v  
Y,n8co^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *s1o?'e  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U2_;  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 31g1zdT!  
#if _MSC_VER > 1000 ^l(,'>Cn  
#pragma once j}h%, 7  
#endif // _MSC_VER > 1000  r+]a  
Qc9[/4R>  
class CCaptureDlg : public CDialog mV7_O//  
{ |[V6R\l39  
 // Construction -K^(L #G  
 public: muK)Y w[#N  
  BOOL bTray; w0>5#j q#r  
  BOOL bRegistered; >&Ye(3w&  
  BOOL RegisterHotkey(); |%Y=]@f  
  UCHAR cKey; B 4e}%  
  UCHAR cMask; /KiaLS  
  void DeleteIcon(); Q Na*Y@i  
  void AddIcon(); R8% u9o  
  UINT nCount; }/xdHt  
  void SaveBmp(); k3 '5Ei  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \>/AF<2"  
  // Dialog Data $H,9GIivD  
  //{{AFX_DATA(CCaptureDlg) ='/#G0W  
  enum { IDD = IDD_CAPTURE_DIALOG }; }q/[\3  
  CComboBox m_Key; 5',b~Pp  
  BOOL m_bControl; R;/LB^X]  
  BOOL m_bAlt; 2zjY|g/  
  BOOL m_bShift; \<=.J`o{  
  CString m_Path; 78mJ3/?rC  
  CString m_Number; FP6Jf I8  
  //}}AFX_DATA fb]=MoiJ  
  // ClassWizard generated virtual function overrides 7z&^i-l.  
  //{{AFX_VIRTUAL(CCaptureDlg) \Zk<|T61$  
 public: w/0;N`YB  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %eu_Pr6X  
 protected: H~<wAer,Op  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e $5s],,n  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +zFEx%3^  
  //}}AFX_VIRTUAL RoD9  
  // Implementation z\IZ5'  
 protected: B<!wh  
  HICON m_hIcon; 1N8YD .3  
  // Generated message map functions BGT`) WP  
  //{{AFX_MSG(CCaptureDlg) xiQd[[(sM  
  virtual BOOL OnInitDialog(); 1$c[G}h  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =?B[oq  
  afx_msg void OnPaint(); `? f sU  
  afx_msg HCURSOR OnQueryDragIcon(); TsRbIq[  
  virtual void OnCancel(); 49#?I:l  
  afx_msg void OnAbout(); m`3gNox  
  afx_msg void OnBrowse(); VS<w:{*  
  afx_msg void OnChange(); -uK@2} NZ  
 //}}AFX_MSG u bi6=  
 DECLARE_MESSAGE_MAP() .V^h<d{  
}; HtI>rj/\ x  
#endif @v\jL+B+m  
"8yDqm  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 52Q~` t7F  
#include "stdafx.h" QTI^?@+N>  
#include "Capture.h" Z5>}  
#include "CaptureDlg.h" !:dhK  
#include <windowsx.h> y=WCR*N  
#pragma comment(lib,"hook.lib") p["20 ?^  
#ifdef _DEBUG 7!, p,|K  
#define new DEBUG_NEW $5yH8JU  
#undef THIS_FILE ]FO)U  
static char THIS_FILE[] = __FILE__; EG!):P  
#endif {$-\)K  
#define IDM_SHELL WM_USER+1 C'0=eel[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .$-%rU:*}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1\Vp[^#Vx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !% yd'"6Dl  
class CAboutDlg : public CDialog ez*O'U  
{ cU=/X{&Om  
 public: [IuF0$w=dj  
  CAboutDlg(); |G>Lud  
  // Dialog Data a`QKN rA2  
  //{{AFX_DATA(CAboutDlg) WPNvZg9*c  
  enum { IDD = IDD_ABOUTBOX }; 2k""/xMF'  
  //}}AFX_DATA cX-) ]D  
  // ClassWizard generated virtual function overrides /SYzo4(  
  //{{AFX_VIRTUAL(CAboutDlg) WO6;K]  
 protected: A&;Pt/#'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K"ytE2:3  
  //}}AFX_VIRTUAL e/u (Re  
  // Implementation r)t-_p37  
 protected: Xc@%_6  
  //{{AFX_MSG(CAboutDlg) 4EEXt<c.  
  //}}AFX_MSG X6c['Zrc  
  DECLARE_MESSAGE_MAP() _S#3!Wx  
}; &l1CE1 9<  
umj5M5oe3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +QVe -  
{ !F*CEcB  
 //{{AFX_DATA_INIT(CAboutDlg) DC%H(2  
 //}}AFX_DATA_INIT +aIy':P  
} C")NN s =  
wrt^0n'r)c  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) erZ%C <  
{ l 7=WO#Pb  
 CDialog::DoDataExchange(pDX); 5oI gxy  
 //{{AFX_DATA_MAP(CAboutDlg) _LSf )  
 //}}AFX_DATA_MAP 9 l9|w4YJs  
} z}m)u  
Ni 5Su  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L%O( I  
 //{{AFX_MSG_MAP(CAboutDlg) j*)K> \  
 // No message handlers p=U5qM.O  
 //}}AFX_MSG_MAP :Qra9; Y  
END_MESSAGE_MAP() o5eFLJ6  
Nl`8Kcv  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E; Z1HF R  
: CDialog(CCaptureDlg::IDD, pParent) @#5PPXp  
{ u~a@:D/F{G  
 //{{AFX_DATA_INIT(CCaptureDlg) HGRH9W  
  m_bControl = FALSE; 6*H F`@(  
  m_bAlt = FALSE; 'xY@ I`x  
  m_bShift = FALSE; s\dF7/b  
  m_Path = _T("c:\\"); ; X3bgA']  
  m_Number = _T("0 picture captured."); J~vK`+Zs  
  nCount=0; !>5!Fb=Sy  
  bRegistered=FALSE;  Enj],I  
  bTray=FALSE; )D q/fW  
 //}}AFX_DATA_INIT ;iEFG^'tG  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KUqD<Jj?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); HN tl>H  
} ?rn#S8nNx<  
,d34v*U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ()v{HB i  
{ & ]/Z~Vt  
 CDialog::DoDataExchange(pDX); C|A:^6d3=  
 //{{AFX_DATA_MAP(CCaptureDlg) [m 3k_;[  
  DDX_Control(pDX, IDC_KEY, m_Key); p#95Q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); PH}^RR{H[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _ mw(~r8R  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); hd}"%9p  
  DDX_Text(pDX, IDC_PATH, m_Path); OjiQBsgnj  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \!4sd2Yi  
 //}}AFX_DATA_MAP %v(\;&@  
} (7g1eEK%  
"~lGSWcU  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p$cSES>r:  
//{{AFX_MSG_MAP(CCaptureDlg) &t\KKsUtd  
 ON_WM_SYSCOMMAND() {r!X W  
 ON_WM_PAINT() <ZM8*bqi  
 ON_WM_QUERYDRAGICON() yr /p3ys  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7BhRt8FSD+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h[O!kwE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) oLXQ#{([  
//}}AFX_MSG_MAP D'823,-).  
END_MESSAGE_MAP() Y "& c .  
c*g(R.!  
BOOL CCaptureDlg::OnInitDialog() ,4wZ/r> d  
{ Lc<C1I 5=  
 CDialog::OnInitDialog(); =K)au$BE|  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4V`ypFme  
 ASSERT(IDM_ABOUTBOX < 0xF000); /# M|V6n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qeyBZ8BG  
 if (pSysMenu != NULL) HEjrat;5  
 { Wh)QCp0|n  
  CString strAboutMenu; X>#!s Lt  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7QlA/iKqK  
  if (!strAboutMenu.IsEmpty()) 5!PU+9Kh  
  { m{bw(+r  
   pSysMenu->AppendMenu(MF_SEPARATOR); H[{ch t h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <eq93  
  } IRZ?'Im  
 } ;?9u#FRtw  
 SetIcon(m_hIcon, TRUE); // Set big icon |'2E'?\/x  
 SetIcon(m_hIcon, FALSE); // Set small icon P2`!)teN  
 m_Key.SetCurSel(0); <,Zk9 t&  
 RegisterHotkey(); V}>0r+NL<  
 CMenu* pMenu=GetSystemMenu(FALSE); `~"l a>}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "yI)F~A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7 C5m#e3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~pqp`  
 return TRUE; // return TRUE unless you set the focus to a control PQ2u R  
} *HwTq[y  
{qm(Z+wcmb  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b7/1 ]  
{  @GYM4T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :LL>C)(f  
 { vTD`Ja#h  
  CAboutDlg dlgAbout; ^zv28Wq>  
  dlgAbout.DoModal(); Pv`^#BX'  
 } a"{tqNc  
 else ?hS n)  
 { m#'2 3  
  CDialog::OnSysCommand(nID, lParam); o(. PxcD  
 } JeJc(e  
} 7K`A2  
L44-: 3  
void CCaptureDlg::OnPaint() a<[@p  
{ 1@H3!V4  
 if (IsIconic()) _AQ :<0/#  
 { :CN,I!:  
  CPaintDC dc(this); // device context for painting hIw<gb4J%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); qPpC)6-Q  
  // Center icon in client rectangle j0k"iv  
  int cxIcon = GetSystemMetrics(SM_CXICON); >Z?3dM~[  
  int cyIcon = GetSystemMetrics(SM_CYICON); AO9F.A<T5  
  CRect rect; ;fhFv&`mE  
  GetClientRect(&rect); *N$#cz  
  int x = (rect.Width() - cxIcon + 1) / 2; tLpDIA_8  
  int y = (rect.Height() - cyIcon + 1) / 2; 4 ~17s`+  
  // Draw the icon e jwFQ'wTx  
  dc.DrawIcon(x, y, m_hIcon); 67Ai.3dR  
 } m?_S&/+*  
 else o_<o8!]l"  
 { #Vanw!  
  CDialog::OnPaint(); aIk%$Mat  
 } YSt']  
} n-dO |3,  
-\j}le6;c  
HCURSOR CCaptureDlg::OnQueryDragIcon() LD WFc_  
{ D a)[mxJ  
 return (HCURSOR) m_hIcon; CCX\"-C  
} }abM:O "Y  
g[j"]~  
void CCaptureDlg::OnCancel() <Ja>  
{ ,k/*f+t  
 if(bTray) p~28?lYv  
  DeleteIcon(); xX  
  CDialog::OnCancel(); =%|S$J  
} S"w$#"EJA  
Warz"n]iC  
void CCaptureDlg::OnAbout() fAfsKO*  
{ PK u+$  
 CAboutDlg dlg; jd=k[Yqr  
 dlg.DoModal(); ;y?,myO  
} \{n]&IjA  
i 4eb\j  
void CCaptureDlg::OnBrowse() 1P4jdp=~  
{ oa+Rr&t'  
 CString str; 0?ZJJdI3  
 BROWSEINFO bi; S 1|[}nYP  
 char name[MAX_PATH]; <?,o {  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *;O$=PE  
 bi.hwndOwner=GetSafeHwnd(); ;*+jCL 2F  
 bi.pszDisplayName=name; VZJs@qx:Z  
 bi.lpszTitle="Select folder"; |J2R w f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (hVhzw"~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CJ&0<Z}{m  
 if(idl==NULL) ZYrXav<  
  return; &M ~*w~w`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0,nDyTS^  
 str.ReleaseBuffer(); u A:|#mO  
 m_Path=str; iU{F\>  
 if(str.GetAt(str.GetLength()-1)!='\\') c0u!V+V%  
  m_Path+="\\"; f>5{SoM  
 UpdateData(FALSE); qr(SAIX"  
} <O>r e3s  
9>qR6k ?  
void CCaptureDlg::SaveBmp() wa W2$9O  
{ A5+vzu^  
 CDC dc; z:|4S@9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .wx; !9  
 CBitmap bm; AU$W=Z*  
 int Width=GetSystemMetrics(SM_CXSCREEN); Zo22se0)  
 int Height=GetSystemMetrics(SM_CYSCREEN); nvxftbfE^D  
 bm.CreateCompatibleBitmap(&dc,Width,Height); N9Yc\?_NU_  
 CDC tdc; Tul_/`An  
 tdc.CreateCompatibleDC(&dc); |~CN]N  
 CBitmap*pOld=tdc.SelectObject(&bm); ;58l_ue  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  s6 w</  
 tdc.SelectObject(pOld); Z6X?M&-Lz  
 BITMAP btm; yEy} PCJ&  
 bm.GetBitmap(&btm); Sq}hx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >"B95$x5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); oKiBnj5J  
 BITMAPINFOHEADER bih; (J][(=s;a  
 bih.biBitCount=btm.bmBitsPixel; wnP#.[,V  
 bih.biClrImportant=0; <Jo_f&&{  
 bih.biClrUsed=0; <n>Kc}c  
 bih.biCompression=0; FlRbGg^  
 bih.biHeight=btm.bmHeight; q/?#+d  
 bih.biPlanes=1; W sQo+Ua  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7Xm pq&g  
 bih.biSizeImage=size; U/m6% )Yx(  
 bih.biWidth=btm.bmWidth; ;c_X ^"d  
 bih.biXPelsPerMeter=0; 0CQ\e1S,#  
 bih.biYPelsPerMeter=0; 1Qtojph  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); & p"ks8"  
 static int filecount=0; N0sf V  
 CString name; 4_8%ZaQ\.?  
 name.Format("pict%04d.bmp",filecount++); a [iC!F2  
 name=m_Path+name; %7Z _Hw  
 BITMAPFILEHEADER bfh; y|nMCkuX  
 bfh.bfReserved1=bfh.bfReserved2=0; 9PVM06   
 bfh.bfType=((WORD)('M'<< 8)|'B'); )Rn}4)9!iT  
 bfh.bfSize=54+size; 7:I` ~ @m  
 bfh.bfOffBits=54; j{IAZs#@>  
 CFile bf; ,-&ler~[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ VieC+Kk  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $[6:KV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T#Qn\ 8  
  bf.WriteHuge(lpData,size); { o=4(RC  
  bf.Close(); I`}-*% ki(  
  nCount++; AM1J ^Dp  
 } "6lf~%R"  
 GlobalFreePtr(lpData); OA_:_%a(  
 if(nCount==1) LXG,IG  
  m_Number.Format("%d picture captured.",nCount); Mje6Q  
 else d3+pS\&IX?  
  m_Number.Format("%d pictures captured.",nCount); xpKD 'O=T  
  UpdateData(FALSE); lq}=&)%C  
} <K%qaf  
!,+peMy  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5v=%pQbY  
{ &eG,CIT  
 if(pMsg -> message == WM_KEYDOWN) > F&Wuf  
 { D:U:( pg  
  if(pMsg -> wParam == VK_ESCAPE) 4T`u?T]  
   return TRUE; d Ayof=  
  if(pMsg -> wParam == VK_RETURN) !1]72%k[  
   return TRUE; K~5QL/=1  
 } p}hOkx4R\  
 return CDialog::PreTranslateMessage(pMsg); 7KnZ  
} cj`g)cX|  
=M>1;Qr<Z/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D%N^iJC,9  
{ =2BGS\$#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j#"?Oe{_1  
  SaveBmp(); I&U?8  
  return FALSE; KtUI(*$`  
} YBN@{P$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p)N=  
 CMenu pop; FRQ0tIp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G,e>dp_cPu  
 CMenu*pMenu=pop.GetSubMenu(0); DmM<Kkg.J  
 pMenu->SetDefaultItem(ID_EXITICON); lplEQ]J|  
 CPoint pt; WLQm|C,  
 GetCursorPos(&pt); P&V,x`<Z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SG2s!Ht  
 if(id==ID_EXITICON) 5vj;lJKcd`  
  DeleteIcon(); "GEJ9_a[  
 else if(id==ID_EXIT) h!?7I=p~#  
  OnCancel(); N0oBtGb  
 return FALSE; ;"hED:z6%  
} +u#;k!B/>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,OsFv}v7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) YgNt>4K  
 AddIcon(); ^]3Y11sI  
 return res; sWP5=t(i+9  
} Yj|Oy  
Cb7f-Eag  
void CCaptureDlg::AddIcon() tI|?k(D  
{ K4YpE}]u  
 NOTIFYICONDATA data; <f&z~y=  
 data.cbSize=sizeof(NOTIFYICONDATA); Dj'aWyW'  
 CString tip; \?{nP6=  
 tip.LoadString(IDS_ICONTIP); ?~$0;5)QC  
 data.hIcon=GetIcon(0); )Ge.1B$8h  
 data.hWnd=GetSafeHwnd(); "~0m_brf  
 strcpy(data.szTip,tip); V.vA~a  
 data.uCallbackMessage=IDM_SHELL; t&T0E.kh*X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &[f.;1+C  
 data.uID=98; ~0,Utqy  
 Shell_NotifyIcon(NIM_ADD,&data); dElOy?v  
 ShowWindow(SW_HIDE); -@X?~4Idz  
 bTray=TRUE; XZYpU\K  
} H'Bor\;[>  
r t@Jw]az  
void CCaptureDlg::DeleteIcon() fpJM)HU  
{ vyP3]+n  
 NOTIFYICONDATA data; 1P:r=Rt/  
 data.cbSize=sizeof(NOTIFYICONDATA); 0W<:3+|n4  
 data.hWnd=GetSafeHwnd(); obKWnet  
 data.uID=98; "5"6mw?  
 Shell_NotifyIcon(NIM_DELETE,&data); @r]wZ~@  
 ShowWindow(SW_SHOW); A9' [x7N  
 SetForegroundWindow(); uo;aC$US  
 ShowWindow(SW_SHOWNORMAL); fhw.A5Ck  
 bTray=FALSE; I ugYlt  
} W+-a@)sh3Q  
4HQP,  
void CCaptureDlg::OnChange() hqIYo .<  
{ N=^{FZ  
 RegisterHotkey(); Gx ci  
} `mXbF  
[`nY /g:  
BOOL CCaptureDlg::RegisterHotkey() k #y4pF_  
{ ;UTT>j  
 UpdateData();  17AJT  
 UCHAR mask=0; Dj}n!M`2I  
 UCHAR key=0; mr dG- t(k  
 if(m_bControl) +b"RZ:tKp  
  mask|=4; bwR_ uF  
 if(m_bAlt) Q?-HU,RBO  
  mask|=2; +ntrp='7O7  
 if(m_bShift) P9= L?t.  
  mask|=1; PXqLK3AE  
  key=Key_Table[m_Key.GetCurSel()]; k nrR%e;  
 if(bRegistered){ d0ThhO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7cV9xIe^  
  bRegistered=FALSE; xdb9oH  
 } wNMgY  
 cMask=mask; AuuZWd  
 cKey=key; <7N8L  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M3c!SXx\  
 return bRegistered; DFKFsu8s  
} 4A6D>ChB'E  
Pj9n`LwM  
  四、小结 8.FBgZh*  
/HbxY  
  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:
3+5=?,请输入中文答案:八 正确答案:八