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
  • 6053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: /5<=m:  
  $J^fpXO  
  一、实现方法 ua)jGif  
m"T}em#   
  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: !E_Zh*lgm  
9QaE)wt  
#pragma data_seg("shareddata") ?ac4GA(  
HHOOK hHook =NULL; //钩子句柄 d:k n%L6k_  
UINT nHookCount =0; //挂接的程序数目 Wqkzj^;"G  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d[>HxPwo  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [~u&#!*W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *s,[Uy![  
static int KeyCount =0; lLp,sNAj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :r@t'  
#pragma data_seg() (6.uNLr  
2E?!Q I\O  
  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。 LFI#wGhXVk  
-OSj<m<  
  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: ^DN:.qQ  
8L,=Eap  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FieDESsX>  
cKey,UCHAR cMask) FpiTQC7d  
{ b8e\(Dww  
 BOOL bAdded=FALSE; u4_QLf@I  
 for(int index=0;index<MAX_KEY;index++){ M+0PEf.  
  if(hCallWnd[index]==0){ \n t~K}a  
   hCallWnd[index]=hWnd; 0'Si ^>bW  
   HotKey[index]=cKey; Z,/K$;YWo  
   HotKeyMask[index]=cMask; <n4` #d  
   bAdded=TRUE; j)2I+[aoB  
   KeyCount++; T8|5%Y  
   break; &iInru3  
  } D8<C7  
 } 37$ ^ie)  
 return bAdded; UXlZI'|He  
} puJB&u"4L  
//删除热键 ":_II[FPY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IH;sVT $M  
{ d)e mTXB(  
 BOOL bRemoved=FALSE; `0N7Gc  
 for(int index=0;index<MAX_KEY;index++){ J Cq>;br.  
  if(hCallWnd[index]==hWnd){ <(q(5jG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  ]'`E  
    hCallWnd[index]=NULL; m/1FVC@*  
    HotKey[index]=0; &s='$a; 4  
    HotKeyMask[index]=0; UWF \Vx*)b  
    bRemoved=TRUE; [Q0V5P~Q'  
    KeyCount--; yo=L1; H  
    break; {u/1ph-  
   } ZRG Cy5Rk  
  } >Jmla~A  
 } )-26(aNGT  
 return bRemoved; 7IkPi?&{  
} 2}A)5P*K  
!JDr58  
|ZL?Pqki  
  DLL中的钩子函数如下: {2h *NFp  
b!P,+!<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \ dFE.4  
{ 0k5-S~_\  
 BOOL bProcessed=FALSE; oGRk/@  
 if(HC_ACTION==nCode) =nGFLH6)  
 { %+H_V1F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3l~+VBR_  
   switch(wParam) BYB4- ,  
   {  `UTPX'Vz  
    case VK_MENU: d/bimQ  
     MaskBits&=~ALTBIT; ${MzO i  
     break; x-m*p^}  
    case VK_CONTROL: b)<WC$"  
     MaskBits&=~CTRLBIT; SHX`/  
     break; .`}TND~  
    case VK_SHIFT: @"@|O>KJ  
     MaskBits&=~SHIFTBIT; +Yc^w5 !(  
     break; ->rqr#  
    default: //judge the key and send message {5~h   
     break; n.&7lg^X  
   } SO=gG 2E  
   for(int index=0;index<MAX_KEY;index++){  xgcxA:  
    if(hCallWnd[index]==NULL) PjeI&@  
     continue; V 9Qt;]mQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) byxlC?q7  
    { t,?, T~#9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q< XFw-Pv  
     bProcessed=TRUE; \ZZ6r^99  
    } 5c` ;~  
   } AH#mL  
  } %):_  
  else if((lParam&0xc000ffff)==1){ //有键按下 cuN9R G  
   switch(wParam) Z*m^K%qJ  
   { YGJ!!(~r  
    case VK_MENU: Hu"$ )V  
     MaskBits|=ALTBIT; 509T?\r  
     break; ]SCHni_  
    case VK_CONTROL: ^eh.Iml'@  
     MaskBits|=CTRLBIT; 7GOBb|  
     break; -G.N  
    case VK_SHIFT: ]p`y  
     MaskBits|=SHIFTBIT; rGP;0KtQ  
     break; G*I    
    default: //judge the key and send message s<zN`&t  
     break; lxyTh'  
   } )8A.Wg4S;c  
   for(int index=0;index<MAX_KEY;index++){ !:&SfPv  
    if(hCallWnd[index]==NULL) A0<g8pv  
     continue; Uj7YTB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nQ\`]_C  
    { E7L>5z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \>6*U r  
     bProcessed=TRUE; p AOKy  
    } YB"gLv?  
   } c["1t1G  
  } q[\3,Y  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,^([aK  
   for(int index=0;index<MAX_KEY;index++){ pG#tMec  
    if(hCallWnd[index]==NULL) 98Vv K?  
     continue; p(n0(}eVC'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~6f/jCluR%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vwT1bw.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 J@2jx4   
   } 5p#0K@`n/  
  } ESCN/ocV  
 } [c3!xHt5O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #kv9$  
} 8g0 #WV  
6TW<,SM  
  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: ] `$6=) _X  
IU8zidn&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :^]Po$fl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $5i\D rs  
9WG=3!-@  
  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: ,/?J!W@m  
AwZ@)0Wy  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $mPR)T  
{ nLm'a_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ZWCsrV*;  
 { VeWh9:"bJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *:CTIV5N0  
  SaveBmp(); M7/5e3  
  return FALSE; NCKR<!(  
 } -s 0SQe{!_  
 …… //其它处理及默认处理 p%$r\G-x  
} %@PcQJg U<  
N/o?\q8  
`j{3|C=  
  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。 16 AlmegDk  
> SZ95@Oh  
  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。 (2;Aqx5i  
mfj{_fR3  
  二、编程步骤 w5i*pOG)Z  
X"TL'"?fo  
  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"; jwk+&S  
8XH;<z<oJ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =8l' [  
DghyE`  
  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; >&.N_,*  
w~+*Vd~U  
  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; D+!T5)>(  
K}cZK  
  5、 添加代码,编译运行程序。 &>c=/]Lop  
7**zb"#y  
三、程序代码 %bP+P(vZ  
&b@_ah+f  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K>'4^W5d,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) xQZOGq  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %1{S{FB  
#if _MSC_VER > 1000 q?j7bp]  
#pragma once Aa9l-:R  
#endif // _MSC_VER > 1000 [\ku,yd%0  
#ifndef __AFXWIN_H__ @{IX do  
#error include 'stdafx.h' before including this file for PCH pss')YP.  
#endif UT@Qo}:  
#include "resource.h" // main symbols Sqp91[,  
class CHookApp : public CWinApp L[zTT\a  
{ S_sHwObFu|  
 public: >(2;(TbQm0  
  CHookApp(); q}_8iDO6  
  // Overrides OkRb3}  
  // ClassWizard generated virtual function overrides \ ERBb.  
  //{{AFX_VIRTUAL(CHookApp) <\~@l^lU  
 public: +IXr4M&3  
  virtual BOOL InitInstance(); 'cCM[P+  
  virtual int ExitInstance(); ar@,SKU'K  
  //}}AFX_VIRTUAL ~[!Tpq5  
  //{{AFX_MSG(CHookApp) d*TH$-F!p  
  // NOTE - the ClassWizard will add and remove member functions here. yHY2 SXm  
  // DO NOT EDIT what you see in these blocks of generated code ! ~Xx}:@Ld  
  //}}AFX_MSG S>5w=RK   
  DECLARE_MESSAGE_MAP() *fY*Wy9  
}; 3x(Y+ ymP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); bSTori5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "A[. 7w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t,Tq3zB  
BOOL InitHotkey(); M7qg\1L  
BOOL UnInit(); k6 OO\=  
#endif &LV'"2ng8  
Z&@P<  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. HE*^!2f  
#include "stdafx.h" *=md!^x`  
#include "hook.h" xz`0V}dPl  
#include <windowsx.h> [?6+ r  
#ifdef _DEBUG G9S3r3  
#define new DEBUG_NEW *[>{ 9V  
#undef THIS_FILE 0]ai*\,W7~  
static char THIS_FILE[] = __FILE__; sfVzVS[  
#endif `_&vvJPn@!  
#define MAX_KEY 100 1&h\\&ic  
#define CTRLBIT 0x04 nVpDjUpN  
#define ALTBIT 0x02 "wVisL2+.  
#define SHIFTBIT 0x01 )[99SM   
#pragma data_seg("shareddata") 2L<1]:I  
HHOOK hHook =NULL; ,wr5DQ  
UINT nHookCount =0; di;~$rI!?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B|syb!g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Bz{"K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey kJ* N`=  
static int KeyCount =0; An]Vx<PD  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -Nr*na^H9#  
#pragma data_seg()  <}^p5|  
HINSTANCE hins; )1R[~]y  
void VerifyWindow(); D!,'}G #  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) P/S,dhs(  
//{{AFX_MSG_MAP(CHookApp) Nt tu)wr  
// NOTE - the ClassWizard will add and remove mapping macros here. shLMj)7!  
// DO NOT EDIT what you see in these blocks of generated code! >d;U>P5.  
//}}AFX_MSG_MAP f !7fz~&Sh  
END_MESSAGE_MAP() ,jnaa(n  
']!wc8m1"  
CHookApp::CHookApp() [$6YPM>Ee  
{ KfK5e{yT  
 // TODO: add construction code here, 0{!-h  
 // Place all significant initialization in InitInstance /`qQWB5b  
} Nn0j}ZI)1  
}V/iU_)  
CHookApp theApp; 1q ZnyJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6d5q<C_3t  
{ iOAn/[^xk  
 BOOL bProcessed=FALSE; OZKZv,  
 if(HC_ACTION==nCode) C,O9?t  
 { ,\T`gh  
  if((lParam&0xc0000000)==0xc0000000){// Key up ZRGe$HaU  
   switch(wParam) CTqhXk[  
   { &i805,lx  
    case VK_MENU: tPk> hzW  
     MaskBits&=~ALTBIT; ^S|}<6~6b  
     break; %U[H`E  
    case VK_CONTROL: B<|Vm.D  
     MaskBits&=~CTRLBIT; n-?zH:]GG{  
     break; B0g?!.#23  
    case VK_SHIFT: 2Z9ck|L>  
     MaskBits&=~SHIFTBIT; \R 3O39[  
     break; >kuu\  
    default: //judge the key and send message iYW<qgz  
     break; `/G9*tIR8g  
   } ZKS]BbMZa  
   for(int index=0;index<MAX_KEY;index++){ WK#c* rsij  
    if(hCallWnd[index]==NULL) ),,0T/69+9  
     continue; y2B'0l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s=R^2;^  
    { &?j\=%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M?m@o1\;W  
     bProcessed=TRUE; do l8O  
    } fn5!Nr ,  
   } SJ,];mC0  
  } R-k~\vCW  
  else if((lParam&0xc000ffff)==1){ //Key down vgn,ZcX  
   switch(wParam) x9]vhR/av  
   { A0ZU #"'/  
    case VK_MENU: ihct~y-9W  
     MaskBits|=ALTBIT; ?5[$d{ Gjl  
     break; nGDY::nUE  
    case VK_CONTROL: &`g^b^i  
     MaskBits|=CTRLBIT; H-% B<7  
     break; WxJaE;`Ige  
    case VK_SHIFT: %4wHiCOg  
     MaskBits|=SHIFTBIT; Nah\4-75&  
     break; 4?_^7(%p  
    default: //judge the key and send message R<r,&X?m  
     break; Fbw.Y6  
   } M3fTU CR  
   for(int index=0;index<MAX_KEY;index++) ] < ;y_  
   { d|sf2   
    if(hCallWnd[index]==NULL) =+VDb5= TV  
     continue; msq2/sS~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qnU`Q{  
    { 2p*!up(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8y4t9V  
     bProcessed=TRUE; b6""q9S!  
    } a 4? c~bs  
   } UD&pL'{s  
  } e[QEOx/-h2  
  if(!bProcessed){ HSACaTVK  
   for(int index=0;index<MAX_KEY;index++){ /W{^hVkvC  
    if(hCallWnd[index]==NULL) jU{~3Gn?  
     continue; 94lz?-j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~'Korxa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i66/2BUh.  
   } SO`b+B  
  } GCrsf  
 } F_iZ|B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %YG[?"P'  
} N.V5>2  
$%1oZ{&M  
BOOL InitHotkey() T'5MO\  
{ uOx"oR|  
 if(hHook!=NULL){ BWkTQd<t  
  nHookCount++; 3'55!DE  
  return TRUE; d263#R  
 } 0<Rq  
 else Q^'xVS_.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^ b{~]I  
  if(hHook!=NULL) Jn\>S z(96  
   nHookCount++; N8*QAe kN  
  return (hHook!=NULL); m&- -$sr  
} e=ry_@7  
BOOL UnInit() 0J .]`kR  
{ |-]'~ @~  
 if(nHookCount>1){ k4J Tc2b  
  nHookCount--;  fTGVG  
  return TRUE; .p78 \T  
 } Hr(%y&0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,H] S-uK~  
 if(unhooked==TRUE){ ;(Z9.  
  nHookCount=0; Xz'o<S  
  hHook=NULL; p-6T,')  
 } G[zVGqk  
 return unhooked; *n9=Q9  
} e'3y^Vg  
K{iC'^wP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yh+.Yn=+  
{ Y";K WA}b  
 BOOL bAdded=FALSE; !!)NER-dv  
 for(int index=0;index<MAX_KEY;index++){ EuKkIr/(  
  if(hCallWnd[index]==0){ =BO>Bi&&  
   hCallWnd[index]=hWnd; C:vVFU|4  
   HotKey[index]=cKey; 4=l$wg~;  
   HotKeyMask[index]=cMask; 76cT}l&.h8  
   bAdded=TRUE; r_Pi)MPc  
   KeyCount++; C!|Yz=e  
   break; fjqd16{Q  
  } >UXNR`?  
 } N LSJ D  
 return bAdded; x.q"FXu  
} &iaS3x  
3#{Al[jq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5>fAO =u!Q  
{ tf>"fU\P  
 BOOL bRemoved=FALSE; 55zy]|F"  
 for(int index=0;index<MAX_KEY;index++){ "8\2w]"  
  if(hCallWnd[index]==hWnd){ _rW75n=3b7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d M;v39  
    hCallWnd[index]=NULL; ]9}^}U1."  
    HotKey[index]=0; /Uni6O)oc  
    HotKeyMask[index]=0; OyIIJ!(  
    bRemoved=TRUE; dlioaYc  
    KeyCount--; d*LW32B@  
    break; zCmx1Djz  
   } ,b t j6hg  
  } rb]?"lizi  
 } |}o3EX  
 return bRemoved; /PEL[Os  
} : CP,DO  
5wC,:c[H7  
void VerifyWindow() }`+9ie7]/  
{ Cq}E5M  
 for(int i=0;i<MAX_KEY;i++){ yXCHBz6&  
  if(hCallWnd!=NULL){ yg82a7D  
   if(!IsWindow(hCallWnd)){ 4i+H(d n  
    hCallWnd=NULL; jaQH1^~l/-  
    HotKey=0; 1;~| [C  
    HotKeyMask=0; 9D7i>e%,;-  
    KeyCount--; QVkrhwp  
   } e. R9:  
  } ggy9euWV  
 } CsN^u H  
} di37   
M]SeNYDy  
BOOL CHookApp::InitInstance() f%rZ2h)  
{ #j)"#1IE2W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BCh|^Pk  
 hins=AfxGetInstanceHandle(); ">vi=Tr  
 InitHotkey(); # GzowI'  
 return CWinApp::InitInstance(); OU<v9`<  
} dQy K4T  
@DSKa`  
int CHookApp::ExitInstance() !1/F71l DX  
{ m%s:4Z%=  
 VerifyWindow(); ~re~Ys  
 UnInit(); f'TEua_`  
 return CWinApp::ExitInstance(); k +Cwnp  
} &"^U=f@v  
`7R-2 w<b?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b8glZb*$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gKtgW&PYm  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =X7_!vSv  
#if _MSC_VER > 1000 "NTiQ}i  
#pragma once XJ7pX1nf  
#endif // _MSC_VER > 1000 664D5f#EJ  
/ |isRh|  
class CCaptureDlg : public CDialog \J(kM,ZJ  
{ 9T0g%&  
 // Construction *NC@o*  
 public: #@F.wV0  
  BOOL bTray; &_74h);2I:  
  BOOL bRegistered; ~yJJ00%  
  BOOL RegisterHotkey(); %Rk DR  
  UCHAR cKey; :TkMS8  
  UCHAR cMask; e9>~mtx  
  void DeleteIcon(); `UT UrM  
  void AddIcon(); aa{+,(  
  UINT nCount; %^[D+1ULb  
  void SaveBmp(); /O~Np|~v  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor B:Hr{%O  
  // Dialog Data c:""&>Z  
  //{{AFX_DATA(CCaptureDlg) ri6KD  
  enum { IDD = IDD_CAPTURE_DIALOG }; <,D*m+BWn  
  CComboBox m_Key; _tE55X&  
  BOOL m_bControl; P~%+KxwZQ  
  BOOL m_bAlt; &0xM 2J  
  BOOL m_bShift; "uFwsjz&B  
  CString m_Path; uaZHM@D  
  CString m_Number; 'c# }^@G  
  //}}AFX_DATA U>DCra;  
  // ClassWizard generated virtual function overrides uF<?y0t  
  //{{AFX_VIRTUAL(CCaptureDlg) ~0@fK<C)O  
 public: A WJA?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); l2I%$|)d  
 protected: SYa O'c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %`YR+J/V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [2E(3`-u  
  //}}AFX_VIRTUAL h`iOs>  
  // Implementation 3 FV -&Y  
 protected: F< XOt3VY.  
  HICON m_hIcon; QW tDZ>  
  // Generated message map functions (e0(GOqf4  
  //{{AFX_MSG(CCaptureDlg) KC)}M zt6_  
  virtual BOOL OnInitDialog(); r-.>3J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); YrV@k*O*  
  afx_msg void OnPaint(); d</F6aM\  
  afx_msg HCURSOR OnQueryDragIcon(); nv\K!wZI=b  
  virtual void OnCancel(); Qqs1%u;e8  
  afx_msg void OnAbout(); pTXF^:8  
  afx_msg void OnBrowse(); A0:rn\$l3  
  afx_msg void OnChange(); W#=,FZT  
 //}}AFX_MSG dCe LW  
 DECLARE_MESSAGE_MAP() Nd&UWk^  
}; XK})?LTD  
#endif Keem \/  
NpaS2q-d  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file IdK<:)Q  
#include "stdafx.h" n2EPx(~  
#include "Capture.h" Hq!|r8@6  
#include "CaptureDlg.h" *ifz@8C }  
#include <windowsx.h> 5{Q9n{dOh  
#pragma comment(lib,"hook.lib") I Zw  
#ifdef _DEBUG :q?#$?  
#define new DEBUG_NEW e .~11bx  
#undef THIS_FILE ncMzHw  
static char THIS_FILE[] = __FILE__; &} { #g  
#endif @\o"zU  
#define IDM_SHELL WM_USER+1 I2Imb9k~B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iaLZ|\`3a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PjH'5Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Wky9w r:g  
class CAboutDlg : public CDialog lRb>W31"  
{ Z&U:KrFH  
 public: M&/%qF15  
  CAboutDlg(); MX8|;t  
  // Dialog Data @`dlhz  
  //{{AFX_DATA(CAboutDlg) *@ H\J e`  
  enum { IDD = IDD_ABOUTBOX }; gKQV99  
  //}}AFX_DATA K/K-u  
  // ClassWizard generated virtual function overrides I]E 3&gnC  
  //{{AFX_VIRTUAL(CAboutDlg) Qd{8.lB~LQ  
 protected: qR_>41JU"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {/H<_  
  //}}AFX_VIRTUAL CS~_>bn  
  // Implementation ~$J(it-a  
 protected: ts9wSx~[+  
  //{{AFX_MSG(CAboutDlg) a[ayr$Hk?  
  //}}AFX_MSG ^ nI2<P  
  DECLARE_MESSAGE_MAP() "r* `*1  
}; QXN_ ?E,g/  
IWq#W(yM  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &N._}ts  
{ JWIY0iP  
 //{{AFX_DATA_INIT(CAboutDlg) _OyQ:>M6P  
 //}}AFX_DATA_INIT 0Q`v#$?":  
} oLh ,F"nB  
8-B7_GoJ+B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;o9ixmT<-o  
{ \~"Ub"~I  
 CDialog::DoDataExchange(pDX); }\Rmwm-  
 //{{AFX_DATA_MAP(CAboutDlg) &9fQW?Czs  
 //}}AFX_DATA_MAP ir/uHN@  
} doOuc4  
*=.~PR6W{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }Sbk qd5  
 //{{AFX_MSG_MAP(CAboutDlg) owQ,op #  
 // No message handlers /Pkz3(1  
 //}}AFX_MSG_MAP . ump? M  
END_MESSAGE_MAP() ?5J#  
 dC{dw^  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _io'8X2K%  
: CDialog(CCaptureDlg::IDD, pParent) Uq$/Q7  
{ .<F46?HS  
 //{{AFX_DATA_INIT(CCaptureDlg) `SsoRPW&$  
  m_bControl = FALSE; 7XK0vKmW3  
  m_bAlt = FALSE; b%%r`j,'JE  
  m_bShift = FALSE; Cj<8r S4+  
  m_Path = _T("c:\\"); tP7<WGHd/  
  m_Number = _T("0 picture captured."); t15{>>f4>  
  nCount=0; 0B7G:X0  
  bRegistered=FALSE;  d]`6N  
  bTray=FALSE; L_RVHvA=M/  
 //}}AFX_DATA_INIT jr?/wtw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HFZ'xp|3dn  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9`*Eeb>  
} H8FvI"J  
$_E.D>5^%7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k#Sr;"  
{ &h I!mo  
 CDialog::DoDataExchange(pDX); +tT"  
 //{{AFX_DATA_MAP(CCaptureDlg) } &B6  
  DDX_Control(pDX, IDC_KEY, m_Key); ypx~WXFK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); W.MZN4=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _huJ*W7lR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); e;"J,7@  
  DDX_Text(pDX, IDC_PATH, m_Path);  E|"SM A,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); KE~Q88s  
 //}}AFX_DATA_MAP YHQ]]#'  
} M7cD!s@'I  
?$ e]K/*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) in<.0v9w  
//{{AFX_MSG_MAP(CCaptureDlg) peO@ZKmM  
 ON_WM_SYSCOMMAND() :5,~CtF5 `  
 ON_WM_PAINT() 95z|}16UK  
 ON_WM_QUERYDRAGICON() 1 >j,v+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *k62Qz3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u,So+%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *VsVCUCz5*  
//}}AFX_MSG_MAP )|xu5.F  
END_MESSAGE_MAP() Q_0+N3  
FL^ _)`  
BOOL CCaptureDlg::OnInitDialog() -&>V.hi7  
{ Fm0d0j  
 CDialog::OnInitDialog(); =wdh# {  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); R+Hu?Dv&F  
 ASSERT(IDM_ABOUTBOX < 0xF000); |p&EP2?T  
 CMenu* pSysMenu = GetSystemMenu(FALSE); BZ?3=S1*  
 if (pSysMenu != NULL) CF{b Yf^%  
 { eV|N@  
  CString strAboutMenu; "dX~J3$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4@@Sh`E:  
  if (!strAboutMenu.IsEmpty()) ,r w4Lo  
  { FT- .gi0  
   pSysMenu->AppendMenu(MF_SEPARATOR); )bOfs*S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z/ 1$G"  
  } =# Sw.N  
 } C!*!n^qA  
 SetIcon(m_hIcon, TRUE); // Set big icon MONX&$  
 SetIcon(m_hIcon, FALSE); // Set small icon hi1Ial\Y  
 m_Key.SetCurSel(0); Y0a[Lb0  
 RegisterHotkey(); ?l/6DT>e  
 CMenu* pMenu=GetSystemMenu(FALSE); 0vm>*M*p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hLLSmW (  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :S0!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5;/n`Bd  
 return TRUE; // return TRUE unless you set the focus to a control CW &z?Bra  
} #y:D{%Wp  
+M0pmK!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ca_mift  
{ "CJ~BJI%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _Hv+2E[4Z  
 { pXSShU#  
  CAboutDlg dlgAbout; 4=([v;fc  
  dlgAbout.DoModal(); Q%JI-&K  
 } ~Kw#^.$3T  
 else mZR3Hl$  
 { #{q.s[g*+1  
  CDialog::OnSysCommand(nID, lParam); d2`g,~d  
 } P"_/P8  
} XGx[Ny_A2  
*vD.\e~  
void CCaptureDlg::OnPaint() \FVfV`x  
{ \"a{\E,{;  
 if (IsIconic()) nnv|GnQST  
 { q*3OWr  
  CPaintDC dc(this); // device context for painting ?uq`|1`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); gm-[x5O"  
  // Center icon in client rectangle WP L@v+  
  int cxIcon = GetSystemMetrics(SM_CXICON); xak)YOLRV  
  int cyIcon = GetSystemMetrics(SM_CYICON); }L_YpG7  
  CRect rect; Lb/GL\J)  
  GetClientRect(&rect); p@Y=6Bw  
  int x = (rect.Width() - cxIcon + 1) / 2; 'E_~ |C  
  int y = (rect.Height() - cyIcon + 1) / 2; 9=>fx  
  // Draw the icon eO!9;dJ  
  dc.DrawIcon(x, y, m_hIcon); 1#A$&'&\J;  
 } 53])@Mmus  
 else 7=CkZ&(?  
 { YZg#H) w%  
  CDialog::OnPaint(); t WI-  
 } AoS7B:T;!  
} ~5N}P>4 *  
P1-eDHYw  
HCURSOR CCaptureDlg::OnQueryDragIcon() FDz`U:8  
{ HT;^u"a~  
 return (HCURSOR) m_hIcon; ]3_b3@k  
} ,;`f* #  
Tlw'05\{J  
void CCaptureDlg::OnCancel() Jl/wP   
{ WoEK #,I;  
 if(bTray) nq M7Is  
  DeleteIcon(); p~$cwbQ!  
  CDialog::OnCancel(); u.GnXuax  
} 1r;zA<<%R  
*&NP?-E  
void CCaptureDlg::OnAbout() w 9dkJo  
{ N[e,){v  
 CAboutDlg dlg; o!M8V ^vW  
 dlg.DoModal(); dvB=Zk]m  
}  /|0-O''  
k;l3^kTy  
void CCaptureDlg::OnBrowse() %j7b0pb  
{ vY4sU@+V  
 CString str; AQ~ xjU  
 BROWSEINFO bi; N6Mr#A-{  
 char name[MAX_PATH]; G *CPj^O  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W7S~~  
 bi.hwndOwner=GetSafeHwnd(); FnO@\{M"A  
 bi.pszDisplayName=name; UkL1h7}a\  
 bi.lpszTitle="Select folder"; YZol4q|ic  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y}?|+/ dN  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); OEW'bT)  
 if(idl==NULL) Pxlc RF  
  return; %O"8|ZG9{  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mO>L]<O  
 str.ReleaseBuffer(); Pyo|Sgk  
 m_Path=str; b:dN )m  
 if(str.GetAt(str.GetLength()-1)!='\\') 6_j |@  
  m_Path+="\\";  1MN!  
 UpdateData(FALSE); V(7,N(  
} :"%/u9<A  
y\?ey'o  
void CCaptureDlg::SaveBmp() f"ezmZI  
{ r_T)| ||v  
 CDC dc; R/vHq36d  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RzEzNV  
 CBitmap bm; b#VtPn]  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3!CUJs/W  
 int Height=GetSystemMetrics(SM_CYSCREEN); I1Q!3P  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GcBqe=/B!  
 CDC tdc; Yuv i{ 0  
 tdc.CreateCompatibleDC(&dc);  ;l$$!PJ  
 CBitmap*pOld=tdc.SelectObject(&bm); GK@OdurAR  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6r)P&J  
 tdc.SelectObject(pOld); ![_x/F9  
 BITMAP btm; 'cD?0ou`o  
 bm.GetBitmap(&btm); idI w7hi4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; a1Fx|#! mq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &hOz(825r  
 BITMAPINFOHEADER bih; -%asHDQ{  
 bih.biBitCount=btm.bmBitsPixel; p* >z:=  
 bih.biClrImportant=0; }3(!kW  
 bih.biClrUsed=0; )Qbd/zd\U  
 bih.biCompression=0; XqTguO'  
 bih.biHeight=btm.bmHeight; G/_IY;  
 bih.biPlanes=1; z(|^fi(  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5ya9VZ5#  
 bih.biSizeImage=size; fkV@3sj  
 bih.biWidth=btm.bmWidth; iGyetFqKw  
 bih.biXPelsPerMeter=0; \@<7Vo,  
 bih.biYPelsPerMeter=0; 4EB\R"rWXf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jI-a+LnEm  
 static int filecount=0; ?.~1%l!  
 CString name; &\h7E   
 name.Format("pict%04d.bmp",filecount++); \-\>JPO~<  
 name=m_Path+name; Ew8@{X y  
 BITMAPFILEHEADER bfh; .~]|gg~  
 bfh.bfReserved1=bfh.bfReserved2=0; ]eL# bJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); RTOA'|[0M  
 bfh.bfSize=54+size; fLDrit4_Q  
 bfh.bfOffBits=54; ":!$Jnj,  
 CFile bf; :#rP$LSYC  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -&Rv=q>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {;yO3];Hqw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yM_/_V|G  
  bf.WriteHuge(lpData,size); A}9Z%U  
  bf.Close(); .t8)`MU6.  
  nCount++; >xFvfuyC  
 } +-izC%G  
 GlobalFreePtr(lpData); LF dvz0  
 if(nCount==1) L:i&OCU2k  
  m_Number.Format("%d picture captured.",nCount); >*-%:ub  
 else GP} ;~  
  m_Number.Format("%d pictures captured.",nCount); &jqaW 2  
  UpdateData(FALSE); )x.%PUA  
} iU)I"#\l'k  
T ,lM(2S[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) r.C6` a  
{ +3v)@18B1  
 if(pMsg -> message == WM_KEYDOWN) iN;Pg _Kq  
 { xGd60"w2  
  if(pMsg -> wParam == VK_ESCAPE) l<=;IMWd  
   return TRUE; 59E9K)c3  
  if(pMsg -> wParam == VK_RETURN) I7ao2aS  
   return TRUE; 1Bytu >2  
 } =KE7NXu]-  
 return CDialog::PreTranslateMessage(pMsg); SuE~Wb 5&  
} "zEl2Xn28_  
@r"\bBi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mqSVd^  
{ }lZEdF9GhG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ GBJL B  
  SaveBmp(); |XyX%5p*  
  return FALSE; QPlU+5Cx  
} i<QDV W9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ "[) G{VzT  
 CMenu pop; egoR])2>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "{0G,tdA  
 CMenu*pMenu=pop.GetSubMenu(0); i ;FKnK  
 pMenu->SetDefaultItem(ID_EXITICON); THrLX;I  
 CPoint pt; ,KY;NbL-Jp  
 GetCursorPos(&pt); k8gH#ENNK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &#p1ogf:  
 if(id==ID_EXITICON) At7!Pas#@g  
  DeleteIcon(); omG2p  
 else if(id==ID_EXIT) &Vlno*  
  OnCancel(); eg[EFI.h  
 return FALSE; t@%w:*&  
} ^~4]"J};M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N?\X 2J1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Q):#6|u+  
 AddIcon(); K@.5   
 return res; Cfi{%,em  
} s:T%, xS  
!3b& S4  
void CCaptureDlg::AddIcon() :.:^\Q0  
{ oW^b,{~V  
 NOTIFYICONDATA data; -#\T  
 data.cbSize=sizeof(NOTIFYICONDATA); &;PxDlY5  
 CString tip; 8Km&3nCv$Q  
 tip.LoadString(IDS_ICONTIP); Gek?+|m  
 data.hIcon=GetIcon(0); L%/RD2L D  
 data.hWnd=GetSafeHwnd(); L8 P0bNi  
 strcpy(data.szTip,tip); LuS@Kf8N+  
 data.uCallbackMessage=IDM_SHELL; &V38)83a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H<Sn p)  
 data.uID=98; SmXoNiM"y  
 Shell_NotifyIcon(NIM_ADD,&data); F`D$bE;|  
 ShowWindow(SW_HIDE); h:Pfiw]  
 bTray=TRUE; N/ a4Gl(  
} |Ajd$+3  
DB}Uzw|  
void CCaptureDlg::DeleteIcon() 6-U_TV  
{  9q;O`&  
 NOTIFYICONDATA data; !BQt+4G7  
 data.cbSize=sizeof(NOTIFYICONDATA); v({O*OR  
 data.hWnd=GetSafeHwnd(); @-@Coy 4Tt  
 data.uID=98; t3L>@NWG  
 Shell_NotifyIcon(NIM_DELETE,&data); {vu\qXmMv  
 ShowWindow(SW_SHOW); oO2DPcK  
 SetForegroundWindow(); -H?c4? 5  
 ShowWindow(SW_SHOWNORMAL); ;&d#)&O"e  
 bTray=FALSE; \/Y(m4<P  
} YidcVlOsO  
Wa;N(zw0h  
void CCaptureDlg::OnChange() O8;/oL4 U  
{ 9o@3$  
 RegisterHotkey(); V,r~%p  
} Q 3WD!Z8y  
cU;Bm}U  
BOOL CCaptureDlg::RegisterHotkey() w2B)$u  
{ wNa5qp 0  
 UpdateData(); .6y+van  
 UCHAR mask=0; E\iK_'#  
 UCHAR key=0; ?P9aXwc  
 if(m_bControl) f) sy-o!  
  mask|=4; .; MS 78BR  
 if(m_bAlt) 1RAkqw<E  
  mask|=2; C4m+Ta %  
 if(m_bShift) r8:r}Qj2w[  
  mask|=1; /?.?1-HM  
  key=Key_Table[m_Key.GetCurSel()]; p6JTNx D  
 if(bRegistered){ g->*@%?<w>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Nl\`xl6y]  
  bRegistered=FALSE; f_k'@e{  
 } [-(^>Y  
 cMask=mask; -%fQr5  
 cKey=key; 4"&-a1N  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (\:Rnl  
 return bRegistered;  y|LHnNQ  
} /^=1]+_!  
:Xw|v2z%3  
  四、小结 -2.7Z`*(  
jKUEs75]  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
10+5=?,请输入中文答案:十五