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
  • 7385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: Y2DR oQ  
  K,>D%mJ  
  一、实现方法 r2EIhaGF;  
E! i:h62  
  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: !zw)! rV=  
I\6u(;@  
#pragma data_seg("shareddata") OOEmXb]8  
HHOOK hHook =NULL; //钩子句柄 SOyE$GoOsx  
UINT nHookCount =0; //挂接的程序数目 qq&G~y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0aMw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 / ;%[:x  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;)^eDJ<  
static int KeyCount =0; {I!sXj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 By t{3$  
#pragma data_seg() 4s!rrDN  
# !?5^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。 |/?)u$U<  
rKDMIECrm  
  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: 2Et7o/\<  
k-LB %\p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Tm8c:S^uq)  
cKey,UCHAR cMask) ^oFg5  
{ Kf XE=v{t  
 BOOL bAdded=FALSE; X5'QYZ6kv  
 for(int index=0;index<MAX_KEY;index++){ }ST9&w i~  
  if(hCallWnd[index]==0){ M'=27!D^  
   hCallWnd[index]=hWnd; ,3k"J4|d  
   HotKey[index]=cKey; 8 0>qqz  
   HotKeyMask[index]=cMask; e ,_b  
   bAdded=TRUE; glk_ *x  
   KeyCount++; <t{T]i+  
   break; v'C`;I  
  } !O=J8;oLk  
 } Wmp,,H  
 return bAdded; 2WjQ-mM#  
} $IL7c]Gw  
//删除热键 eCY gi7?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^X%{]b K  
{ [~;#]az  
 BOOL bRemoved=FALSE; )fz)Rrr  
 for(int index=0;index<MAX_KEY;index++){ SC~cryb  
  if(hCallWnd[index]==hWnd){ zMT0ToG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1;p'2-x  
    hCallWnd[index]=NULL;  0u4:=Z}W  
    HotKey[index]=0; $1N_qu  
    HotKeyMask[index]=0; Hnwir!=7  
    bRemoved=TRUE; %y~=+Sm%m  
    KeyCount--; Kq|L: Z  
    break; G)b6Rit  
   } y ?FKou'  
  } %f.(^<G u  
 } DRLX0Ml]\  
 return bRemoved; eKlh }v  
} 0kI.d X)  
`J h> 1l  
6]dK,  
  DLL中的钩子函数如下: 8X`Gm!)  
c <[?Z7y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @Z.s:FV[  
{ |IqQ%;H  
 BOOL bProcessed=FALSE; K9FtFd  
 if(HC_ACTION==nCode) n&x#_B-  
 { 5 N(/K.^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3QDz0ct  
   switch(wParam) -Cxk#-sb#  
   {  n&=3Knbd@d  
    case VK_MENU: lvi~GZ  
     MaskBits&=~ALTBIT; ;T!mNKl  
     break; NZ `( d  
    case VK_CONTROL: d%Zt]1$  
     MaskBits&=~CTRLBIT; 7d?'~}j  
     break; #/  1  
    case VK_SHIFT: 5taYm'  
     MaskBits&=~SHIFTBIT; pHlw&8(f"  
     break; e2Sudd=' G  
    default: //judge the key and send message Akf?BB3bC  
     break; zE +)oQ,  
   } (!Q^.C_m  
   for(int index=0;index<MAX_KEY;index++){ ~A+D H  
    if(hCallWnd[index]==NULL) Ti }Ljp^O  
     continue; bWK}oYB*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Pe w-6u"  
    { p]uwGWDI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ir<HC 'D[  
     bProcessed=TRUE; ]<mXf~zg  
    } \?-`?QPux  
   } PNLtpixZ  
  } ~/J:p5?L  
  else if((lParam&0xc000ffff)==1){ //有键按下 4,kT4_&,  
   switch(wParam) ZYoWz(  
   {  q&0Jl  
    case VK_MENU: -A>1L@N  
     MaskBits|=ALTBIT; *P&ZE   
     break;  Hq h  
    case VK_CONTROL: *p{wC r  
     MaskBits|=CTRLBIT; 8Letpygm  
     break; WRQJ6B  
    case VK_SHIFT: O0#wM-M  
     MaskBits|=SHIFTBIT; DG&14c>g  
     break; >Liv].  
    default: //judge the key and send message -tWkN^j8+  
     break; ^1M:wX r  
   } XCO{}wU)>  
   for(int index=0;index<MAX_KEY;index++){  L2[|g~  
    if(hCallWnd[index]==NULL) oJw~g [  
     continue; w? A&XB+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yzt6   
    { |D u.aN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q>u$tLX&  
     bProcessed=TRUE; 4(MZ*6G]?  
    } , KF>PoySA  
   } ? &ew$%  
  } 5_b`QO  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =h^cfyj  
   for(int index=0;index<MAX_KEY;index++){ }wrZP}zM>  
    if(hCallWnd[index]==NULL) ,{A-<=6t  
     continue; bS _!KU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d ! A)H<Zt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [>+(zlK"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q+E%"`3V4l  
   } nmp(%;<exN  
  } .v G_\-@  
 } L)JpMf0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .w^M?}dx  
} /u{ 9UR[g  
ymSGB`CP  
  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: A.m#wY8  
.4A4\-Cqe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ub%+8 M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C)/uX5  
K:fK! /  
  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: RG|]Kt8  
?V%x94B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EO$_]0yI;_  
{ $;Lb|~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Lz2 AWqR  
 { &*RJh'o|N(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =YkJS%)M)  
  SaveBmp(); @ 'rk[S}A  
  return FALSE; Ia$&SS)K  
 } wy"^a45h  
 …… //其它处理及默认处理 0PD]#.+  
} R| t"(6  
|U%S<X  
O/$pT%D1x  
  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。 f m.-*`ax  
M0DdrL/ L  
  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。 &mDKpYrB  
\[oU7r}?/V  
  二、编程步骤 &bBK#d*-u?  
7yxZe4~|#  
  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"; u&1n~t`  
EAp6IhW{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :\x53-&hO4  
;LNFPo   
  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; Ath^UKO"  
aPaGnP:^  
  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; 4A.ZMH  
iD#HB o  
  5、 添加代码,编译运行程序。 C"_f3[Z  
8P.UB{QNe  
三、程序代码 X6%w6%su5  
[TvH7ott'1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X*VHi  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Xjc{={@p3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \ Xow#@[  
#if _MSC_VER > 1000 E6|!G  
#pragma once > tXn9'S  
#endif // _MSC_VER > 1000 Fy5xIRyI\F  
#ifndef __AFXWIN_H__ ?I&ha-."  
#error include 'stdafx.h' before including this file for PCH KB!.N[!v  
#endif $/5<f<%u&)  
#include "resource.h" // main symbols fg"@qE-;  
class CHookApp : public CWinApp !fr /WxJ  
{ .g_B KeU  
 public: dHc38zp  
  CHookApp(); J Sz'oA5  
  // Overrides ,A9pj k'  
  // ClassWizard generated virtual function overrides Ps5UX6\ .m  
  //{{AFX_VIRTUAL(CHookApp) ZYZQ?FN  
 public: h[72iVn  
  virtual BOOL InitInstance(); }C.M4{a\  
  virtual int ExitInstance(); W@v@|D@  
  //}}AFX_VIRTUAL 4thLK8/c5g  
  //{{AFX_MSG(CHookApp) q3Re F_  
  // NOTE - the ClassWizard will add and remove member functions here. p*)RP2  
  // DO NOT EDIT what you see in these blocks of generated code ! uhvmh  
  //}}AFX_MSG N r5 aU6]  
  DECLARE_MESSAGE_MAP() eYBo*  
}; [RG&1~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); a(&!{Y1bt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HB yk 1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YP{)jAK  
BOOL InitHotkey(); @54,I  
BOOL UnInit(); X~t]qT  
#endif XH&Fn+  
q 1a}o%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /WXy!W30<  
#include "stdafx.h" yHkZInn  
#include "hook.h" 4a]m=]Hm  
#include <windowsx.h> P]gksts9f.  
#ifdef _DEBUG BFmYbK  
#define new DEBUG_NEW zvB!=  
#undef THIS_FILE tyFhp:ZB  
static char THIS_FILE[] = __FILE__; yaV=e1W  
#endif  c'?4*O  
#define MAX_KEY 100 Cr|v3Y#h'  
#define CTRLBIT 0x04 jXq~ x"(  
#define ALTBIT 0x02 xevG)m  
#define SHIFTBIT 0x01 -]"=b\Q  
#pragma data_seg("shareddata") aZ^P*|_K3  
HHOOK hHook =NULL; K}ACZT)Wp  
UINT nHookCount =0; Dv?'(.z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey jV)!9+H#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B~oSKM%8R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey HVaWv].  
static int KeyCount =0; 9k=-8@G9  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;V]EF  
#pragma data_seg() bUbM}  
HINSTANCE hins; D ODo !  
void VerifyWindow(); MVHj?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &RP!9{F<  
//{{AFX_MSG_MAP(CHookApp) <y1V2Np  
// NOTE - the ClassWizard will add and remove mapping macros here. LcCb[r  
// DO NOT EDIT what you see in these blocks of generated code! +cv7]  
//}}AFX_MSG_MAP ;Vc@]6Ck  
END_MESSAGE_MAP() 5g  ,u\`  
6He7A@Eh  
CHookApp::CHookApp() 2/S~l;x  
{ 0HK03&  
 // TODO: add construction code here, (UmoG  
 // Place all significant initialization in InitInstance GczGW4\P'  
} U*F|Z4{W  
INSI$tA~  
CHookApp theApp; g/,fjM_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >ijFQ667>j  
{ %||}WT-wv  
 BOOL bProcessed=FALSE; ?z0f5<dL  
 if(HC_ACTION==nCode) `C"Slz::  
 { Bmuf[-}QW  
  if((lParam&0xc0000000)==0xc0000000){// Key up d!/@+i  
   switch(wParam) RbX!^v<0f6  
   { .{ ^4I  
    case VK_MENU: S W(h%`U  
     MaskBits&=~ALTBIT; 0-cqux2U  
     break; 1\1a;Q3W%,  
    case VK_CONTROL: -e7|DXj  
     MaskBits&=~CTRLBIT; Knsb`1"E^6  
     break; W Da;wt  
    case VK_SHIFT: +4^XFPq~  
     MaskBits&=~SHIFTBIT; /!ZeMY:x  
     break; ,?i^i#Wqzg  
    default: //judge the key and send message YAnt}]u!"  
     break; M iIH&z  
   } ;:1d<Q|  
   for(int index=0;index<MAX_KEY;index++){ avxI\twAU  
    if(hCallWnd[index]==NULL) "Q9S<O8)  
     continue; NhQIpzL)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eCdx(4(\a  
    { 0 z{S@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w] LN(o:  
     bProcessed=TRUE; j{N;2#.u  
    } @<Au|l`  
   } vc o/h  
  } I!lzOg4~  
  else if((lParam&0xc000ffff)==1){ //Key down ~L Gkc t  
   switch(wParam) ElAJR4'{*i  
   { adtK$@Yeg  
    case VK_MENU: B' 6^E#9  
     MaskBits|=ALTBIT; hk4f)z  
     break; ?cdSZ'49[  
    case VK_CONTROL: 5} |O  
     MaskBits|=CTRLBIT; ~J!a?]  
     break; #EtS9D'd+  
    case VK_SHIFT: Mp; t?C4  
     MaskBits|=SHIFTBIT; m>2b %GTh  
     break; lGqwB,K$z4  
    default: //judge the key and send message XPXC7_fV  
     break; {"8\~r&b  
   } FW&P`Iu  
   for(int index=0;index<MAX_KEY;index++) g.aNITjP  
   { EAo7(d@  
    if(hCallWnd[index]==NULL) 9oS\{[x.  
     continue; \@nmM&7C!4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yAtM|:qq  
    { "lLt=s2>L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AC3K*)`E  
     bProcessed=TRUE; (u85$_C  
    } K1uN(T.Ju  
   } 6,M>'s,N  
  } ==(9P`\  
  if(!bProcessed){ 7|PpAvMF  
   for(int index=0;index<MAX_KEY;index++){ #G{}Rd|!  
    if(hCallWnd[index]==NULL) gVCkj!{  
     continue; ||hy+f[A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) D2|-\vJ>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'GQ1;9A57  
   } vq_W zxaG  
  } K,tmh1  
 } DCX 4!,ZF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @I}:HiF  
} >=^g%K$L6J  
Mo &Ia6^  
BOOL InitHotkey() #O]F5JB  
{ &w:"e'FG`  
 if(hHook!=NULL){ 0:Js{$ZL4  
  nHookCount++; 5b9_6L6  
  return TRUE; ,0[8/)$M  
 } xr!FDfM.K  
 else is{I5IR\/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Gh0H) q  
  if(hHook!=NULL) +xRja(d6  
   nHookCount++; 3O%[k<S\VO  
  return (hHook!=NULL); liFNJd`|o+  
} : Ey  
BOOL UnInit() Nt67Ye3;  
{ e.G&hJ r  
 if(nHookCount>1){ sr x`" :  
  nHookCount--; wM(!9Ws3  
  return TRUE; {.SN  
 } ! Qrlb>1z-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Svn|vH  
 if(unhooked==TRUE){ J/w?Fa<  
  nHookCount=0; a}#[mw@m=  
  hHook=NULL;  <VB  
 } 'mpY2|]\$  
 return unhooked; h+zJ"\  
} s`Z(f:/6*  
Yg/e8Q2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S4s\tA<  
{ EiI3$y3;  
 BOOL bAdded=FALSE; td q;D  
 for(int index=0;index<MAX_KEY;index++){ T*\'G6e  
  if(hCallWnd[index]==0){ TWl':}  
   hCallWnd[index]=hWnd; kP%'{   
   HotKey[index]=cKey; 2|tZ xlt-  
   HotKeyMask[index]=cMask; MR%M[SK1  
   bAdded=TRUE; Rb<aCX  
   KeyCount++; 3s\2 9gq  
   break; hnL"f[p@gC  
  } s!Y>\3rMW  
 } e{Om W  
 return bAdded; 82Nh;5T r  
} r$;DA<<|<c  
HoymGU`w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M]jzbJ3Q  
{ $ePAsJ  
 BOOL bRemoved=FALSE; ~6!=_"  
 for(int index=0;index<MAX_KEY;index++){ ?)Z~H,Q(z  
  if(hCallWnd[index]==hWnd){ R_uA!MoLs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {~16j"  
    hCallWnd[index]=NULL; PmvTCfsg  
    HotKey[index]=0; (Z)  
    HotKeyMask[index]=0; k<"ZNQm$.  
    bRemoved=TRUE; HYLU]9aH8  
    KeyCount--; ?F*gFW_k  
    break; ^o!K0 t*  
   } f|?i6.N> f  
  } Cv{rd##Y8  
 } g Gg8O? Z  
 return bRemoved; %&Z!-k(  
} !rb)Y;WQt  
J\_tigd   
void VerifyWindow() (o{QSk\  
{ vb9G_Pfz  
 for(int i=0;i<MAX_KEY;i++){ "pdG%$  
  if(hCallWnd!=NULL){ _zJY1cr  
   if(!IsWindow(hCallWnd)){ "6 dC  
    hCallWnd=NULL; + R])u5c'  
    HotKey=0; 4xT(Uj  
    HotKeyMask=0; PQ@(p%   
    KeyCount--; [rU8%  
   } ?.|qRzWL  
  } vrGRZa  
 } @s2z/ h0H  
} y M , hF  
|w6:mtaS  
BOOL CHookApp::InitInstance() +H/^RvUjF  
{ !s\-i6S>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @luv;X^%  
 hins=AfxGetInstanceHandle(); 3 _:yHwkD  
 InitHotkey(); j?/T7a^  
 return CWinApp::InitInstance(); L\nWhmwl  
} tLS5yT/  
L2P~moVIi  
int CHookApp::ExitInstance() ED[PP2[/  
{ pb$U~TvzhM  
 VerifyWindow(); -78 t0-lM  
 UnInit(); `P)atQ  
 return CWinApp::ExitInstance(); B Gh%3"q  
} z^{VqC*o+  
H1 n`A#6?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MCe =RR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) KSqWq:W+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pHni"i T  
#if _MSC_VER > 1000 uV52ko,  
#pragma once PS`v3|d}}}  
#endif // _MSC_VER > 1000 (Pin9^`ALc  
"%<Oadz ap  
class CCaptureDlg : public CDialog [#)-F_S  
{ |6"zIHvtc  
 // Construction D"bLJ j/!  
 public: DWHl,w;[z`  
  BOOL bTray; A 99 .b  
  BOOL bRegistered; e {N8|l  
  BOOL RegisterHotkey(); 4B-v\3Ff  
  UCHAR cKey; j?g{*M  
  UCHAR cMask; wCkhE,#-_  
  void DeleteIcon(); JDD(e_dw  
  void AddIcon(); dW,$yH_  
  UINT nCount; opjrU$<]N  
  void SaveBmp(); NL0X =i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "npj%O<bd  
  // Dialog Data )<1M'2  
  //{{AFX_DATA(CCaptureDlg) :I+%v  
  enum { IDD = IDD_CAPTURE_DIALOG }; fHb0pp\[.  
  CComboBox m_Key; Y=x]'3}^  
  BOOL m_bControl; 7zgU>$i  
  BOOL m_bAlt; .^l;3*X@  
  BOOL m_bShift; 5bH@R@3m  
  CString m_Path; B<H5WI  
  CString m_Number; }a'8lwF%I  
  //}}AFX_DATA W _yVVr  
  // ClassWizard generated virtual function overrides (VWTYG7  
  //{{AFX_VIRTUAL(CCaptureDlg) U:#9!J?41  
 public: mUm9[X~'  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @;G}bYq^(I  
 protected: Tr(w~et  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )`,3/i9C$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); X[(u]h`  
  //}}AFX_VIRTUAL gK9@-e  
  // Implementation jQj`GnN|  
 protected: ds4ERe /  
  HICON m_hIcon; iU~oPp[e  
  // Generated message map functions Zc{at}{  
  //{{AFX_MSG(CCaptureDlg) elJLTG  
  virtual BOOL OnInitDialog(); (Y)$+9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); lmp0Ye|  
  afx_msg void OnPaint(); m mu{K$9}I  
  afx_msg HCURSOR OnQueryDragIcon(); *t 3fbD  
  virtual void OnCancel(); ZxwI< T:&  
  afx_msg void OnAbout(); }Rt?p8p  
  afx_msg void OnBrowse(); =sG  C  
  afx_msg void OnChange(); B7fURL Rqr  
 //}}AFX_MSG Z<0M_q9?MO  
 DECLARE_MESSAGE_MAP() 'eLO#1Ipf  
}; U9SByqa1  
#endif b_|`jHes  
>(|T]u](q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file E/Q[J.$o  
#include "stdafx.h" z$QYl*F1  
#include "Capture.h" TF^Rh4  
#include "CaptureDlg.h" # yAt `  
#include <windowsx.h> {}s7q|$  
#pragma comment(lib,"hook.lib") >IJH#>i  
#ifdef _DEBUG :,fs' !  
#define new DEBUG_NEW }<[@)g.h.  
#undef THIS_FILE @tM1e<  
static char THIS_FILE[] = __FILE__; ';^VdR]fk  
#endif dArg'Dc4  
#define IDM_SHELL WM_USER+1 bf VKf}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X) owj7U;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ) 'j7Ra  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; pyq~_ Bng  
class CAboutDlg : public CDialog 2h@/Q)z  
{ l <Tkg9  
 public: =d!3_IZ  
  CAboutDlg(); -L NJ*?b  
  // Dialog Data ?.LS _e_0  
  //{{AFX_DATA(CAboutDlg) .Lr;{B  
  enum { IDD = IDD_ABOUTBOX }; x<>#G~-  
  //}}AFX_DATA ]L"jt8E  
  // ClassWizard generated virtual function overrides Xat>d>nJ]  
  //{{AFX_VIRTUAL(CAboutDlg) f 0~<qT?:n  
 protected: ^|5vmI'E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K pDKIi  
  //}}AFX_VIRTUAL MD1n+FgTu  
  // Implementation L09YA  
 protected: ||;V5iR:  
  //{{AFX_MSG(CAboutDlg) 0>6J -   
  //}}AFX_MSG @a'Rn  
  DECLARE_MESSAGE_MAP() P6!c-\  
}; [o<Rgq 4  
+g(>]!swb  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [d`J2^z}  
{ @>}!g9c  
 //{{AFX_DATA_INIT(CAboutDlg) CCNrjaA  
 //}}AFX_DATA_INIT E].hoq7WiB  
} Bk_23ygO_  
j_H9l,V  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )>QpR8 G-  
{ ^RAst1q7  
 CDialog::DoDataExchange(pDX); <'>c`80@\*  
 //{{AFX_DATA_MAP(CAboutDlg)  _/;vsQB  
 //}}AFX_DATA_MAP =2F;'T\6  
} zVKbM3(^  
_D1Uc|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7?9QlUO  
 //{{AFX_MSG_MAP(CAboutDlg) >gRb.-{ux  
 // No message handlers zR_ "  
 //}}AFX_MSG_MAP s!:'3[7+  
END_MESSAGE_MAP() $Ypt /`  
i882r=TE3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <~@}r\  
: CDialog(CCaptureDlg::IDD, pParent) LUc!a4i"fO  
{ Za_w@o  
 //{{AFX_DATA_INIT(CCaptureDlg) _ I"}3*  
  m_bControl = FALSE; v*iD)k:|t  
  m_bAlt = FALSE; K| %.mc s4  
  m_bShift = FALSE; y-6k<RN  
  m_Path = _T("c:\\"); Q'5]E{1<'n  
  m_Number = _T("0 picture captured."); O`j1~o<{  
  nCount=0; Lp.dF)C\  
  bRegistered=FALSE; "Rr)1x7  
  bTray=FALSE; w<#/ngI2  
 //}}AFX_DATA_INIT !w2J*E\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 T1%_sq  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "yJFb=Xdq  
} L1ro\H  
\f\ CK@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o-a\T  
{ d0``:  
 CDialog::DoDataExchange(pDX); S3 12#X(%  
 //{{AFX_DATA_MAP(CCaptureDlg) (yA`h@@WS  
  DDX_Control(pDX, IDC_KEY, m_Key); v7gs $'Q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); NXo$rf:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4zKmoYt  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); K~Nx;{{d  
  DDX_Text(pDX, IDC_PATH, m_Path); 6l]jm j)/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %;/?DQU  
 //}}AFX_DATA_MAP bca4'`3\|  
} $$F iCMI  
e0;0X7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) GB,f'Afl  
//{{AFX_MSG_MAP(CCaptureDlg) ~+|Vzm|S}  
 ON_WM_SYSCOMMAND() 0h/bC)z  
 ON_WM_PAINT() =\~<##sRJ  
 ON_WM_QUERYDRAGICON() u#!QIQW  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) v+d} _rCT  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7" Qj(N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 41G}d+  
//}}AFX_MSG_MAP @=r YOQj |  
END_MESSAGE_MAP() NW_i<#  
0RFBun{  
BOOL CCaptureDlg::OnInitDialog() O{^8dwg  
{ ~H`m"4zQ  
 CDialog::OnInitDialog(); i&mcM_g32  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); USd7g Oq(  
 ASSERT(IDM_ABOUTBOX < 0xF000); +a3H1 tt~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <ks+JkW_  
 if (pSysMenu != NULL) Hq$&rNnq\  
 { {$qE>ic  
  CString strAboutMenu; M/?eDW/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &~=FX e0S  
  if (!strAboutMenu.IsEmpty()) _cvA1Q"  
  { tVQq,_9C  
   pSysMenu->AppendMenu(MF_SEPARATOR); jRiXN %  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #No3}O;"g  
  } XM1; >#kz  
 } HpP82X xj  
 SetIcon(m_hIcon, TRUE); // Set big icon &?g!)O  
 SetIcon(m_hIcon, FALSE); // Set small icon ;P *`v  
 m_Key.SetCurSel(0); FQTAkkA_!  
 RegisterHotkey(); q"(b}3  
 CMenu* pMenu=GetSystemMenu(FALSE);  )OHGg  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #{_iNra9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (vP<}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2$r8^}Nj?  
 return TRUE; // return TRUE unless you set the focus to a control G+7#!y Y  
} hXnfZx%  
A(eB\qG  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) PH.g+u=v  
{ H^ 'As;R  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) n)|{tb^  
 { V82HO{ D  
  CAboutDlg dlgAbout; S5o,\wT  
  dlgAbout.DoModal(); eWWqK9B.-  
 } ] M`%@ps  
 else qP{Fwn  
 { 7+9o<j@@o  
  CDialog::OnSysCommand(nID, lParam); PI\C*_.  
 } 'VgEf:BS  
} 2OVN9_D%  
j+9;Rvt2  
void CCaptureDlg::OnPaint() 5'\detV_  
{ @eJ6UML"  
 if (IsIconic()) w**~k]In  
 { 3D;?X@  
  CPaintDC dc(this); // device context for painting ) >te|@}o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j)ME%17  
  // Center icon in client rectangle JR_%v=n~x  
  int cxIcon = GetSystemMetrics(SM_CXICON); !mZDukfjQ  
  int cyIcon = GetSystemMetrics(SM_CYICON); S86,m =  
  CRect rect; `L LS|S]  
  GetClientRect(&rect); \VpN:RI  
  int x = (rect.Width() - cxIcon + 1) / 2; }7*|s+F(f  
  int y = (rect.Height() - cyIcon + 1) / 2; 'B:8tv  
  // Draw the icon (/7b8)g  
  dc.DrawIcon(x, y, m_hIcon); '8Cg2v5&w  
 } =kTHfdin&  
 else qxB|*P `  
 { gLm,;'h%u  
  CDialog::OnPaint(); x8w l  
 } 2##;[  
} *8r^!(Kj  
f$76p!pDa  
HCURSOR CCaptureDlg::OnQueryDragIcon() Vy=P*  
{ 3n,jrX75u  
 return (HCURSOR) m_hIcon; cgnMoBIc  
} LLc^SP j  
3xk_ZK82  
void CCaptureDlg::OnCancel() 4VF4 8  
{ 8WE@ X)e  
 if(bTray) +T\<oj%}2  
  DeleteIcon(); kXV;J$1  
  CDialog::OnCancel(); +E^2]F7Zk  
} vHZq z<  
H#i,Ve '  
void CCaptureDlg::OnAbout() C7O8B;  
{ R_D&"&   
 CAboutDlg dlg; Xdi<V_!BC-  
 dlg.DoModal();  zo1T`"Y  
} inY_cn?  
0W0GSDx  
void CCaptureDlg::OnBrowse() D6~KLSKm  
{ Wv|CJN;4  
 CString str; LC4VlfU  
 BROWSEINFO bi; r?itd)WC<X  
 char name[MAX_PATH]; o}DR p4;Ka  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _Pno9|  
 bi.hwndOwner=GetSafeHwnd();  svx7  
 bi.pszDisplayName=name; AR!v%Z49i  
 bi.lpszTitle="Select folder"; NE.h/+4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  v%$l(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); OK)>QGl  
 if(idl==NULL) wz1nV}  
  return; -oUGmV_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); N5{v;~Cm}V  
 str.ReleaseBuffer(); 2Z(t/Zp>  
 m_Path=str; X-tw)  
 if(str.GetAt(str.GetLength()-1)!='\\')  )ut$644R  
  m_Path+="\\"; -RJ~Sky[  
 UpdateData(FALSE); [n2zdiiBd  
} Qo :vAv  
 V~VUl)  
void CCaptureDlg::SaveBmp() ;vneeW4|  
{ ep~+]7\  
 CDC dc; d5NE:%K  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sj4\lpZ3h  
 CBitmap bm; L pq)TE#  
 int Width=GetSystemMetrics(SM_CXSCREEN); 43E)ltR=]  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9Nps<+K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j85B{Mab&  
 CDC tdc; FShUw+y  
 tdc.CreateCompatibleDC(&dc); A@Q6}ESD  
 CBitmap*pOld=tdc.SelectObject(&bm); Td,d9M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4qQE9f xdY  
 tdc.SelectObject(pOld); "b402"&  
 BITMAP btm; +.&P$`;TZj  
 bm.GetBitmap(&btm); *v%gNq  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -.r"|\1X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yUWc8]9\W  
 BITMAPINFOHEADER bih; D_?Tj  
 bih.biBitCount=btm.bmBitsPixel; ZR -RzT1  
 bih.biClrImportant=0; u(FOSmNkN  
 bih.biClrUsed=0; &a4FGzR#  
 bih.biCompression=0; ]?)uYot  
 bih.biHeight=btm.bmHeight; c&1_lI,tH  
 bih.biPlanes=1; (V&8 WN  
 bih.biSize=sizeof(BITMAPINFOHEADER); pj<aMh  
 bih.biSizeImage=size; 2Y%7.YX"  
 bih.biWidth=btm.bmWidth; lX%-oRQ/os  
 bih.biXPelsPerMeter=0; sVr|kvn2  
 bih.biYPelsPerMeter=0; KAXjvZN1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); t #Kucde  
 static int filecount=0; KB^8Z@(+  
 CString name; V,=5}qozQ  
 name.Format("pict%04d.bmp",filecount++); XlD=<$Nk7  
 name=m_Path+name; !yT=*Cj4  
 BITMAPFILEHEADER bfh; qtdkK LT  
 bfh.bfReserved1=bfh.bfReserved2=0; )^BZ,e  
 bfh.bfType=((WORD)('M'<< 8)|'B'); f,i2U|1pbj  
 bfh.bfSize=54+size; ?FNgJx*\S  
 bfh.bfOffBits=54; y{&%]Fq <5  
 CFile bf; .rG~\Ws  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A9N8Hav  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oexTz[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); YhNrg?nS  
  bf.WriteHuge(lpData,size); 45n.%*,  
  bf.Close(); )5n0P Zi  
  nCount++; nBd]rak'  
 } w>\oz  
 GlobalFreePtr(lpData); j94~c YV  
 if(nCount==1) O'B3sy  
  m_Number.Format("%d picture captured.",nCount); ,tQN L\t  
 else :-#7j} R&  
  m_Number.Format("%d pictures captured.",nCount); <{8x-zbR+  
  UpdateData(FALSE); eI:x4K,#  
} nTc#I~\  
-~aG_Bp!($  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q|P M6ta  
{ 4W|cIcU W  
 if(pMsg -> message == WM_KEYDOWN) @{#'y4\>  
 { )Nx*T9!Q  
  if(pMsg -> wParam == VK_ESCAPE) wh8;:<|  
   return TRUE; ftcLP  
  if(pMsg -> wParam == VK_RETURN) q+4dHS)x  
   return TRUE; 5x|$q kI  
 } x0>N{ADXQ  
 return CDialog::PreTranslateMessage(pMsg); X.>~DT%0Lm  
} n $N M  
S"@6,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5FuV=Yuc  
{ J/D~]U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v(R^LqE  
  SaveBmp(); f+ZOE?"  
  return FALSE; +zbCYA  
} :R +BC2x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n7B2rRJH  
 CMenu pop; lK/4"&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AcEz$wy  
 CMenu*pMenu=pop.GetSubMenu(0); Tc!n@!RA|  
 pMenu->SetDefaultItem(ID_EXITICON); *~4<CP+"0  
 CPoint pt; ~8 UMwpl-  
 GetCursorPos(&pt); l%('5oz@\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \1&4wzT  
 if(id==ID_EXITICON) k&:q|[N  
  DeleteIcon(); @aN~97 H\  
 else if(id==ID_EXIT) k"%JyO8Y  
  OnCancel(); Nt]nwae>A  
 return FALSE; ^t71${w##  
} J @~g>   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o3\^9-jmp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6iXV  
 AddIcon(); ?./fVoA]V  
 return res; 1u5^a^O(|  
} ]K8G}|Wy6  
-hfkF+=U'  
void CCaptureDlg::AddIcon() suIYfjh  
{ o<p4r}*AVJ  
 NOTIFYICONDATA data; -dF (_ %C  
 data.cbSize=sizeof(NOTIFYICONDATA); B5+Q%)52  
 CString tip; rN7JJHV  
 tip.LoadString(IDS_ICONTIP); )g?jHm-p\  
 data.hIcon=GetIcon(0); ]b>XN8y.  
 data.hWnd=GetSafeHwnd(); 9=6BQ`u  
 strcpy(data.szTip,tip); Nxl#]  
 data.uCallbackMessage=IDM_SHELL; 2"|7 YI  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #@w/S:KbJt  
 data.uID=98; pYm#iz  
 Shell_NotifyIcon(NIM_ADD,&data); 7O%^4D  
 ShowWindow(SW_HIDE); ooB9i No^  
 bTray=TRUE; =`>ei  
} 6:8Nz   
>'=9sCi  
void CCaptureDlg::DeleteIcon() %Qb}z@>fJk  
{ D3,)H%5.y  
 NOTIFYICONDATA data; jTNt!2 :B  
 data.cbSize=sizeof(NOTIFYICONDATA); 6 <`e]PT  
 data.hWnd=GetSafeHwnd(); %Jd!x{a`>A  
 data.uID=98; %XBTN  
 Shell_NotifyIcon(NIM_DELETE,&data); N"RPCd_  
 ShowWindow(SW_SHOW); XYD-5pG  
 SetForegroundWindow(); J#j3?qrxu  
 ShowWindow(SW_SHOWNORMAL); Q(Q?L5  
 bTray=FALSE; 7LM&3mA<  
} iD%a;]  
|7n%8JsY!"  
void CCaptureDlg::OnChange() w(Tr ,BFF  
{ uVhzJu.  
 RegisterHotkey(); B 5qy4MFWs  
} uit.r^8l  
3?`TEw~'  
BOOL CCaptureDlg::RegisterHotkey() IY[qWs  
{ @*L-lx  
 UpdateData(); i"Hc(lg  
 UCHAR mask=0; A7XA?>~+|  
 UCHAR key=0; A.7lo  
 if(m_bControl) e2tru_#  
  mask|=4; ?IS[2 v$   
 if(m_bAlt) +_vf=d  
  mask|=2; =zrfh-lwH  
 if(m_bShift) @c"s6h&  
  mask|=1; eHGx00:  
  key=Key_Table[m_Key.GetCurSel()]; :5&UWL|  
 if(bRegistered){ \+/ciPzA-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); thX4-'i  
  bRegistered=FALSE; 90Sras>F  
 } (nBh6u*  
 cMask=mask; "X!1^)W -8  
 cKey=key; UUbO\_&y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t>LSP$  
 return bRegistered; ~#VDJ[Z  
} 9vW]HOK  
Y`$\o  
  四、小结 50A\Y)i_mZ  
0wSy[z4V  
  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