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
  • 5429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: /@"Y^  
  jZteooJG|  
  一、实现方法 ~g6 3qs  
g^7MMlY%  
  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: o*5U:'=5}  
`JB?c  
#pragma data_seg("shareddata") q_V0+qH  
HHOOK hHook =NULL; //钩子句柄 T 2F6)e  
UINT nHookCount =0; //挂接的程序数目 ,WD X(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 nhT-Ido  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H,QTYXi "  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y7/F _{  
static int KeyCount =0; ;Hmp f0$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 L\%orLEmK  
#pragma data_seg() 0.Ta Xbi  
v6GPS1:a  
  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。 i#/]KsSp  
! | #83  
  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: Jrxz'9qRG  
Y}s@WJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR {pL+2%`~  
cKey,UCHAR cMask) [sF(#Y:I  
{ G2Vv i[c  
 BOOL bAdded=FALSE; P 43P]M2  
 for(int index=0;index<MAX_KEY;index++){ 58 bCUh#uw  
  if(hCallWnd[index]==0){ @-HG`c ct  
   hCallWnd[index]=hWnd; xtfBfA  
   HotKey[index]=cKey; x/!5K|c  
   HotKeyMask[index]=cMask; q%Yn;g|_  
   bAdded=TRUE; Djq!P  
   KeyCount++; 3^?ZG^V  
   break; A9BX_9}]  
  } ,m_WR7!$E  
 } Lfog {Vzs  
 return bAdded; #]P9b@@e  
} nUS| sh  
//删除热键 !3X0FNGq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D^ Jk@<*  
{ T 20&F  
 BOOL bRemoved=FALSE;  -I.d}[  
 for(int index=0;index<MAX_KEY;index++){ t.p~\6Yi  
  if(hCallWnd[index]==hWnd){ 5 Xn.CBd]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8[vc?+>&  
    hCallWnd[index]=NULL; @$9'@")  
    HotKey[index]=0; F$BbYf2i  
    HotKeyMask[index]=0; */:uV B,b2  
    bRemoved=TRUE; >-8cU_m7s  
    KeyCount--; Zf$Np50@(  
    break; qz?mh4Oh  
   } M(x$xAiD  
  } >P6BW  
 } 7%f&M>/  
 return bRemoved; L){iA-k;Ec  
} Q7Iw[=;\  
fGhn+8VfX  
,R%q}IH#  
  DLL中的钩子函数如下:  ]^'@ [<  
[e[<p\]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I9h ?;(  
{ #Cpd9|  
 BOOL bProcessed=FALSE; ;OqB5qd  
 if(HC_ACTION==nCode) 1 zw*/dp  
 { Ym%xx!9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wE+${B03  
   switch(wParam) h8Yx#4  
   {  7 d LuX   
    case VK_MENU: #(An6itl  
     MaskBits&=~ALTBIT; IxLhU45  
     break; OnQdq^UB  
    case VK_CONTROL: .7K7h^*F  
     MaskBits&=~CTRLBIT; `]Q:-h  
     break; 'AN>`\mR$  
    case VK_SHIFT: =[b)1FUp  
     MaskBits&=~SHIFTBIT; q`-;AG|xF  
     break;  (x/k.&  
    default: //judge the key and send message =UUU$hq2  
     break; , ]bB9tid  
   } |$?bc3  
   for(int index=0;index<MAX_KEY;index++){ _ODbY;M  
    if(hCallWnd[index]==NULL) .o) `m9/  
     continue; C74a(Bk}H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /c uLc^(X  
    { }zhGS!fO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wgCa58H76  
     bProcessed=TRUE; M#(+c_(r  
    } *G* k6.9W!  
   } 8Z(Mvq]f&  
  } : q#Xq;Wp  
  else if((lParam&0xc000ffff)==1){ //有键按下 6I@h9uIsze  
   switch(wParam) n{6G"t:^l  
   { g+J-Zg6  
    case VK_MENU: 0u\GO;  
     MaskBits|=ALTBIT; ?@E!u|]K  
     break; E? _Z`*h  
    case VK_CONTROL: gNt(,_]ZR  
     MaskBits|=CTRLBIT; ZYC<Wb)I  
     break; 1t)il^p4[;  
    case VK_SHIFT: FCnm1x#  
     MaskBits|=SHIFTBIT; #B4%|v;`E?  
     break; 6i1LjLB  
    default: //judge the key and send message #Y$hNQQ$F  
     break; h*-Pr8  
   } PYGRsrcFd#  
   for(int index=0;index<MAX_KEY;index++){ ~]QHk?[wc  
    if(hCallWnd[index]==NULL) /5u<78GW1  
     continue; 4O35 "1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =3L;Z[^9  
    { x QIq^/F0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -3Hy*1A.  
     bProcessed=TRUE; 2 B  
    } zG(\+4GE!  
   } 2nR[Xh?L  
  }  5~>z h  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZzSz%z_sE  
   for(int index=0;index<MAX_KEY;index++){ 8uWa=C)  
    if(hCallWnd[index]==NULL) 97}OL`y  
     continue; "'t0h{W r8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oz,e/v8~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C#Na&m  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ; #&yn=^  
   } +mn ,F};  
  } Le\?+h42>  
 } HhvdqvIEG  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x^y'P<ypw  
} Eea*s'  
Dy:|g1>  
  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: FY#C.mL  
sG F aL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]x(!&y:h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {0WHn.,2Y  
$42{HFGq  
  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: ~XO Ts  
c}2jmwq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eQ]~dA8>  
{ 0 eDHu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) m)'=G%y  
 { $w`=z<2yo1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wY[+ZT  
  SaveBmp(); NU5.o$  
  return FALSE; OG>}M$ Ora  
 } ,,q10iF  
 …… //其它处理及默认处理 9-fLz?J  
}  &7K?w~  
cWe"%I  
KV0]m^@x  
  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。  2*^j  
xD~5UER  
  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。 J^Wa8Q;9lX  
9,:l8  
  二、编程步骤 F^];U+J  
"W955?4m  
  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"; W *),y:  
<^5Z:n!q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; t*1fLumXR  
klT@cO-9  
  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; HMh"}I2n  
l*d(;AR  
  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; T?ZRiR)@  
n'E(y)9|  
  5、 添加代码,编译运行程序。 f Sa"%8%  
1SCR.@ k<  
三、程序代码 l~w2B>i)  
U@uGNMKR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;;6uw\6 O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !Fd~~v  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a%/9v"}  
#if _MSC_VER > 1000 s@K4u^$A  
#pragma once .$+#1-  
#endif // _MSC_VER > 1000 &m)6J'q3k  
#ifndef __AFXWIN_H__ /<|%yE&KhJ  
#error include 'stdafx.h' before including this file for PCH #P0&ewy  
#endif Whm,F^  
#include "resource.h" // main symbols ) l:[^$=,  
class CHookApp : public CWinApp uKUiV%p!  
{ g| I6'K!<  
 public: $5aV:Z3P  
  CHookApp(); e> e}vZlX  
  // Overrides dxMOn  
  // ClassWizard generated virtual function overrides "n(hfz0y%  
  //{{AFX_VIRTUAL(CHookApp) >UiYL}'br6  
 public: ^ *k?pJ5  
  virtual BOOL InitInstance(); rWa2pO  
  virtual int ExitInstance(); !Qu"BF   
  //}}AFX_VIRTUAL &=] ~0$  
  //{{AFX_MSG(CHookApp) N8F~8lTi  
  // NOTE - the ClassWizard will add and remove member functions here. IP xiV]c  
  // DO NOT EDIT what you see in these blocks of generated code !  ]hk  
  //}}AFX_MSG )r xX+k+b/  
  DECLARE_MESSAGE_MAP() K*K,}W&}  
}; D#cyOrzy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); RzE_K'M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lb4Pcd j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~ =M7 3U#  
BOOL InitHotkey(); SJb&m-  
BOOL UnInit(); . qO@Q=  
#endif }YGV\Nu  
B~MU^ |v  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &^ 1$^=  
#include "stdafx.h" +" .X )avF  
#include "hook.h" snE8 K}4  
#include <windowsx.h> [=6]+V83M  
#ifdef _DEBUG x<tb  
#define new DEBUG_NEW s~ a"4~f  
#undef THIS_FILE f-vCm 5f  
static char THIS_FILE[] = __FILE__; le|~BG hL  
#endif 89pEfl j2  
#define MAX_KEY 100 UZ\u;/}  
#define CTRLBIT 0x04 4":KoS`,j  
#define ALTBIT 0x02 K[YI4pt7  
#define SHIFTBIT 0x01 kCWV r  
#pragma data_seg("shareddata") QwW&\h[8?  
HHOOK hHook =NULL; y-'$(x  
UINT nHookCount =0; ]7W&JKmA&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :~&~y-14  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT FH?U(-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  VA6}  
static int KeyCount =0; at#ja_ hd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift D=j-!{zB  
#pragma data_seg() BKCA <  
HINSTANCE hins; I0D(F i  
void VerifyWindow(); x9UX!Z5*>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L iN$ pwm  
//{{AFX_MSG_MAP(CHookApp) e'6/` Evqz  
// NOTE - the ClassWizard will add and remove mapping macros here. aH)}/n  
// DO NOT EDIT what you see in these blocks of generated code! JU1~e@/'%  
//}}AFX_MSG_MAP PxWT1 !  
END_MESSAGE_MAP() e24WW^S  
,1~"eGl!  
CHookApp::CHookApp() (y=C_wvqZ  
{ % L$bf#  
 // TODO: add construction code here, {f/~1G[M  
 // Place all significant initialization in InitInstance k9sh @ENy  
} vYwYQG  
1gL2ia  
CHookApp theApp; RIWxs Zt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dyz2.ZY~2  
{ EizKoHI-z  
 BOOL bProcessed=FALSE; ` 06;   
 if(HC_ACTION==nCode) jl4rbzse  
 { }|0^EWL  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2J7:\pR^  
   switch(wParam) %aG5F}S2~  
   { 9vuyv*-}e  
    case VK_MENU: ]l_\71  
     MaskBits&=~ALTBIT; %". HaI]  
     break; }NHaCG[,  
    case VK_CONTROL: 5;tD"/nz  
     MaskBits&=~CTRLBIT; mitHT :%r2  
     break; 8g@<d ^8@  
    case VK_SHIFT: 1OGx>J6  
     MaskBits&=~SHIFTBIT; |s7s6k)mm  
     break; ^bGNq X  
    default: //judge the key and send message LM:vsG  
     break; ]R+mKUZ9  
   } {2O1"|s ,  
   for(int index=0;index<MAX_KEY;index++){ 6KXtcXQ  
    if(hCallWnd[index]==NULL) /hr7NT{e%v  
     continue; 8bTn^!1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RuL i,'u  
    { Sj%u)#Ub  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >{q]&}^U  
     bProcessed=TRUE; 'F+C4QAq  
    } [<lHCQXJ/  
   } G,&<<2{(f;  
  } 7-bd9uVK  
  else if((lParam&0xc000ffff)==1){ //Key down m|SUV  
   switch(wParam) Rvqq.I8aC  
   { RD!&LFz/}  
    case VK_MENU: &jS>UsGh  
     MaskBits|=ALTBIT; z Xg3[orF  
     break; |XaIx#n  
    case VK_CONTROL: 3 ]5^r}  
     MaskBits|=CTRLBIT; #3i3G(mQ  
     break; [;n9:Qxf  
    case VK_SHIFT: Lu?C-$a C  
     MaskBits|=SHIFTBIT; .p<:II:6  
     break; nD_GL  
    default: //judge the key and send message hE-h`'ha`  
     break; @x*c1%wg  
   } +%+tr*04O  
   for(int index=0;index<MAX_KEY;index++) KoOz#,()  
   { l.q&D< _  
    if(hCallWnd[index]==NULL) vLv@&lMW  
     continue; kjTduZ/3 "  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u0JB\)(-/h  
    { UFXaEl}R   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); QmQ=q7  
     bProcessed=TRUE; %6|nb:Oa  
    } iFd+2S%  
   } TJ10s%,V  
  } 8H%;WU9-  
  if(!bProcessed){ EEEh~6?-e  
   for(int index=0;index<MAX_KEY;index++){ =2`[&  
    if(hCallWnd[index]==NULL) Kr?TxhUHd  
     continue; 5#HW2"7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F6|TP.VY_.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4GkWRu1  
   } ew>XrT=Zm  
  } ()Y~Q(5ji  
 } UE8kpa)cQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vk}n,ecl  
} OSRp0G20k\  
_~'=C#XI)  
BOOL InitHotkey() hCi60%g/n  
{ 1$xNUsD2  
 if(hHook!=NULL){ R|6Cv3:  
  nHookCount++; M92dZ1+6  
  return TRUE; @3>u@  
 } f/U`  
 else rlMLW  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j b!x:  
  if(hHook!=NULL) >BV^H.SO|1  
   nHookCount++; x) ,eI'mf  
  return (hHook!=NULL); bHY=x}Hv  
} }fp-pe69z  
BOOL UnInit() +KF^Z$I  
{ Q7HRzA^-  
 if(nHookCount>1){ T.])diuvj-  
  nHookCount--; 6Pz4\uE=  
  return TRUE; n7zm>&  
 } hwPw]Ln/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %41m~Wh2  
 if(unhooked==TRUE){ F|IAiE  
  nHookCount=0; [u =+3b  
  hHook=NULL; X1DF*wI  
 } qSM|hHDo)  
 return unhooked; cutuDZ  
} Q$a{\*[:+  
+! ]zA4x  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DEBB()6,  
{ &u]8IEv}u  
 BOOL bAdded=FALSE; f&=AA@jLv  
 for(int index=0;index<MAX_KEY;index++){ XPavReGf  
  if(hCallWnd[index]==0){ +vw\y  
   hCallWnd[index]=hWnd; \S"isz  
   HotKey[index]=cKey; .r|tSfm6  
   HotKeyMask[index]=cMask; j%Y#(Q>  
   bAdded=TRUE; =Z{O<xw'  
   KeyCount++; )\1@V+!E%  
   break; '50OgF'  
  } K='z G*$l  
 } r7RIRg_  
 return bAdded; R8Wr^s>'  
} 0%32=k7O[  
/,BD#|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #%pI(,o=  
{ h8x MI  
 BOOL bRemoved=FALSE; AgWa{.`f:  
 for(int index=0;index<MAX_KEY;index++){ _F4Ii-6  
  if(hCallWnd[index]==hWnd){ Wjo[ENHM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M=8.Bp|Ye  
    hCallWnd[index]=NULL; ZFi ee|,q  
    HotKey[index]=0; ](Xb _xMf  
    HotKeyMask[index]=0; ,L|%"K]yM  
    bRemoved=TRUE; t*=CZE-  
    KeyCount--; EH- sZAv  
    break; w_aknt T  
   }  03L]  
  } %p Ynnfr  
 } SUMrFd~  
 return bRemoved; MOQ6 :  
} |-b#9JQ[A  
4`lLf  
void VerifyWindow() N&.H|5  
{ `:ArT}F  
 for(int i=0;i<MAX_KEY;i++){ Yc`o5Q\>  
  if(hCallWnd!=NULL){ Fh)IgzFj  
   if(!IsWindow(hCallWnd)){ 48J@C vU  
    hCallWnd=NULL; >>QY'1Eu  
    HotKey=0; T tfo^ksw  
    HotKeyMask=0; @T@< _ ?)  
    KeyCount--; v>6"j1Z  
   } ~Sdb_EZ  
  } loEPr5 bL  
 } v|Pv 03%?7  
} bYcV$KJk  
R]JT&p|w.1  
BOOL CHookApp::InitInstance() -5)H<dAQZ  
{ %{7|1>8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >d(~# Z`  
 hins=AfxGetInstanceHandle(); EW}Bzh>b  
 InitHotkey(); ##q2mm:a9P  
 return CWinApp::InitInstance(); zU,9T  
} 3Lfqdqj  
SDC4L <!  
int CHookApp::ExitInstance() R1s`z|?  
{ AKY1o.>z  
 VerifyWindow(); Mhm@R@  
 UnInit(); 1]d!~  
 return CWinApp::ExitInstance(); ,D5cjaX<  
} QpF;:YX^3  
AL[KpY  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Tg7an&#  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FX;QG94!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O 5!7'RZ  
#if _MSC_VER > 1000 _;W.q7 b]  
#pragma once {k(g]#pP  
#endif // _MSC_VER > 1000 hMa]B*o/-  
y>S.?H:P  
class CCaptureDlg : public CDialog W}nlRbN?  
{ x" 7H5<  
 // Construction n"$jG:A QJ  
 public: R%Hi+#/dr-  
  BOOL bTray; +[Dx?XM  
  BOOL bRegistered; M+-*QyCFK  
  BOOL RegisterHotkey(); &C:IX\  
  UCHAR cKey; QfmJn((  
  UCHAR cMask; "N;`1ce  
  void DeleteIcon(); ?K1/ <PE+  
  void AddIcon(); "H2EL}3/]  
  UINT nCount; WEAT01  
  void SaveBmp(); mR!1DQ.\<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e*sfPHt  
  // Dialog Data HsxVZ.dS  
  //{{AFX_DATA(CCaptureDlg) &g#@3e1>  
  enum { IDD = IDD_CAPTURE_DIALOG }; }?lrU.@zg  
  CComboBox m_Key; sm9k/(-  
  BOOL m_bControl; _qU4Fadgm  
  BOOL m_bAlt; C=-=_>Q,L<  
  BOOL m_bShift; 3W V"U  
  CString m_Path; 3\AU 72-  
  CString m_Number; '-wj9OU  
  //}}AFX_DATA ( B!uy`  
  // ClassWizard generated virtual function overrides <xup'n^7C  
  //{{AFX_VIRTUAL(CCaptureDlg) f0!))/rSD  
 public: ~cWAl,(B<F  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %Celc#v  
 protected:  Ii6<b6-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rr/B= O7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "<6G6?sz  
  //}}AFX_VIRTUAL P)"noG_'i  
  // Implementation C^s^D:   
 protected: {ba q+  
  HICON m_hIcon; yZAS#ko}}  
  // Generated message map functions T=<@]$?  
  //{{AFX_MSG(CCaptureDlg) iyN:%ofh  
  virtual BOOL OnInitDialog(); oL-]3TY~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cmu@4j&  
  afx_msg void OnPaint(); ) g0%{dfJ  
  afx_msg HCURSOR OnQueryDragIcon(); U] ~$g}!)  
  virtual void OnCancel(); (DJ"WG  
  afx_msg void OnAbout(); RPwbTAl}  
  afx_msg void OnBrowse(); C,wL0Yj[  
  afx_msg void OnChange(); 0;hqIJcE:\  
 //}}AFX_MSG +00b)TF  
 DECLARE_MESSAGE_MAP() UMv.{iEj  
}; DP[IZ C  
#endif s:?SF.  
+ndaLhj'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Y)1PB+  
#include "stdafx.h" lvdf^b/ j  
#include "Capture.h" A8xvo/n$  
#include "CaptureDlg.h" P|^f0Rw3.  
#include <windowsx.h> 09|K>UC)v  
#pragma comment(lib,"hook.lib") imo$-}A  
#ifdef _DEBUG #TeG-sFJg@  
#define new DEBUG_NEW ]"r&]qx7  
#undef THIS_FILE 4hO!\5-w:  
static char THIS_FILE[] = __FILE__; :D euX  
#endif ]99|KQ<s  
#define IDM_SHELL WM_USER+1 u6?Q3 bvI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XYjV.j\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H  >j  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +j#+8Ze  
class CAboutDlg : public CDialog c7<wZ  
{ u$h 4lIl  
 public: .RE:;<|w  
  CAboutDlg(); kd>hhiz|  
  // Dialog Data j1^I+j)  
  //{{AFX_DATA(CAboutDlg) 1!ii;s^e  
  enum { IDD = IDD_ABOUTBOX }; R"4Vtww  
  //}}AFX_DATA 1=r#d-\tR  
  // ClassWizard generated virtual function overrides 5rwu!Y;7*  
  //{{AFX_VIRTUAL(CAboutDlg) -] L6=  
 protected: v;BV@E0}x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ld\R:{M"  
  //}}AFX_VIRTUAL aL*&r~`&e'  
  // Implementation Mh~q//  
 protected: Olt `:;j-  
  //{{AFX_MSG(CAboutDlg) ) dn(G@5  
  //}}AFX_MSG T m,b,hi$  
  DECLARE_MESSAGE_MAP() 2- &k^Gl!:  
}; nx@=>E+a  
g~Z vA(`  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 56}U8X  
{ NYyh|X:m  
 //{{AFX_DATA_INIT(CAboutDlg) gRrL[z  
 //}}AFX_DATA_INIT J\/cCW-rF  
} w&X<5'GM  
ccB&O _  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pSoiH<33  
{ +GG9^:<yr  
 CDialog::DoDataExchange(pDX); ;>#wU'  
 //{{AFX_DATA_MAP(CAboutDlg) < nXL  
 //}}AFX_DATA_MAP ht7l- AK  
} 00'%EYO  
:X0k]p  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %WSo b@f8  
 //{{AFX_MSG_MAP(CAboutDlg) TBs|r#  
 // No message handlers 3Iua*#<m,  
 //}}AFX_MSG_MAP wE[]6\_x1  
END_MESSAGE_MAP() ]"J~:{, d  
rk&IlAE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) N6>(;ugJ1-  
: CDialog(CCaptureDlg::IDD, pParent) f) znTJL  
{ N|1M1EBOu>  
 //{{AFX_DATA_INIT(CCaptureDlg) QU4h8}$  
  m_bControl = FALSE; #J@[Wd  
  m_bAlt = FALSE; s2teym,uG  
  m_bShift = FALSE; 0x'#_G65y  
  m_Path = _T("c:\\"); ZNJ@F<  
  m_Number = _T("0 picture captured."); %+f>2U4I  
  nCount=0; uH/J]zKR  
  bRegistered=FALSE; Z&#('Z  
  bTray=FALSE; 0M*Z'n +  
 //}}AFX_DATA_INIT rw: c  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $RYa6"`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q(@U2a8  
} 3cFf#a#  
AZ0;3<FfLp  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H+1-]'g`  
{ ,X#2\r<|  
 CDialog::DoDataExchange(pDX); 9G9fDG#F\I  
 //{{AFX_DATA_MAP(CCaptureDlg) "k/;[ Wt]  
  DDX_Control(pDX, IDC_KEY, m_Key); w0ht  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); S)lkz'tdk  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #EO9UW5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); t=|evOz]  
  DDX_Text(pDX, IDC_PATH, m_Path); p rYs $j  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &{ay=Mj  
 //}}AFX_DATA_MAP 5XO;N s  
} Q7*SE%H  
JF # # [O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mZk]l5Lc  
//{{AFX_MSG_MAP(CCaptureDlg) ,ek_R)&[o  
 ON_WM_SYSCOMMAND() D6%J\C13`  
 ON_WM_PAINT() c0PIc^R(@  
 ON_WM_QUERYDRAGICON() |*:'TKzNS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $@"l#vJPfc  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) os,* 3WO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }#.L7SIJ<J  
//}}AFX_MSG_MAP y603$Cv  
END_MESSAGE_MAP() ^X0P'l &D2  
YwteZSbp6M  
BOOL CCaptureDlg::OnInitDialog() iEd\6EZ  
{ 1HXjN~XF  
 CDialog::OnInitDialog(); DAS/43\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ozAS[B6  
 ASSERT(IDM_ABOUTBOX < 0xF000); '{E@*T /<.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 8WtsKOno  
 if (pSysMenu != NULL) X<i^qoV  
 { 7{e% u#  
  CString strAboutMenu; !>v2i"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {wO3<9  
  if (!strAboutMenu.IsEmpty()) L0* nm.1X  
  { u\ #"L  
   pSysMenu->AppendMenu(MF_SEPARATOR); a&tSj35*6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); H(bs$C4F  
  } F5?m6`g?  
 } 'd.EC#  
 SetIcon(m_hIcon, TRUE); // Set big icon  5V6G=H  
 SetIcon(m_hIcon, FALSE); // Set small icon pNOwDJtK  
 m_Key.SetCurSel(0); qC}-_u7s  
 RegisterHotkey(); DBPRGQ  
 CMenu* pMenu=GetSystemMenu(FALSE); y<HO:kZ8`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >_e]C}QUr  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K&nE_.kbl  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f%Ns[S~r  
 return TRUE; // return TRUE unless you set the focus to a control n1JRDw"e$$  
} q;QbUO  
sp#p8@Cj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) e}Cif2#d~  
{ >ZPsjQuf"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )Gj8X}DM  
 { i;NUAmx  
  CAboutDlg dlgAbout; |o{:ZmzM  
  dlgAbout.DoModal(); /`f^Y>4gD  
 } B-.gI4xa  
 else )>.&N[v  
 { sArhZ[H  
  CDialog::OnSysCommand(nID, lParam); Y<mej][  
 } E}Y!O"CAV  
} )f}YW/'  
R<[qGt|L  
void CCaptureDlg::OnPaint() :A1{d?B  
{ Qy.w=80kf  
 if (IsIconic()) "5-^l.CKH  
 { &QDW9 Mi  
  CPaintDC dc(this); // device context for painting /e7O$L)   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^.#jF#u~  
  // Center icon in client rectangle J/\V%~ 1F  
  int cxIcon = GetSystemMetrics(SM_CXICON); JQ,1D`?.a  
  int cyIcon = GetSystemMetrics(SM_CYICON); *RXbc~ H  
  CRect rect; L!rw[x  
  GetClientRect(&rect); L{hnU7sY  
  int x = (rect.Width() - cxIcon + 1) / 2; VTG9$rQZ  
  int y = (rect.Height() - cyIcon + 1) / 2; n;(\5{a  
  // Draw the icon ]F;f`o  
  dc.DrawIcon(x, y, m_hIcon); o=21|z  
 } MZlk0o2  
 else BnCbon)  
 { OlAs'TE^  
  CDialog::OnPaint(); Q?3Gk%T0[  
 } Qk\A c  
} \=uKHNP?#  
"ul {d(K3  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]3VI|f$$  
{ <1FC%f/  
 return (HCURSOR) m_hIcon; E0u~i59Z  
} D[^m{ 9_  
5!l0zLQP o  
void CCaptureDlg::OnCancel() _{r=.W+ w  
{ %%NlTE8*  
 if(bTray) -sw  .  
  DeleteIcon(); >?6&c  
  CDialog::OnCancel(); !OBEM1~ 1  
} q0$ !y!~  
(>VX-Y/  
void CCaptureDlg::OnAbout() u#Z#)3P  
{ 0Uz\H0T1  
 CAboutDlg dlg; c.,2GwW  
 dlg.DoModal(); Rniq(FA x  
} NbC@z9Q  
#Yr9AVr}K  
void CCaptureDlg::OnBrowse() c:-!'l$ !  
{ Z2TL#@  
 CString str; g{8,Wx,,  
 BROWSEINFO bi; 1jN-4&  
 char name[MAX_PATH]; hg+X(0  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  :@%4  
 bi.hwndOwner=GetSafeHwnd(); y>72{  
 bi.pszDisplayName=name; DTa N"{  
 bi.lpszTitle="Select folder"; 89\n;5'f4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *Txl+zTY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !eEHmRgg4  
 if(idl==NULL) |`lzfe  
  return; 3=Cc.a/3  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oXxCXO,q  
 str.ReleaseBuffer(); &e;=cAXG  
 m_Path=str; F{eU";D  
 if(str.GetAt(str.GetLength()-1)!='\\') G`\f  
  m_Path+="\\"; Xb{ [c+.  
 UpdateData(FALSE); (xVsDAp=@  
} |P -8HlOr  
#$c Rkw  
void CCaptureDlg::SaveBmp() %kB8'a3  
{ 0JlZs]  
 CDC dc; o(:[r@Z0z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "Qja1TQ  
 CBitmap bm; CAcS~ "  
 int Width=GetSystemMetrics(SM_CXSCREEN); "\}@gV#r$A  
 int Height=GetSystemMetrics(SM_CYSCREEN); xER\ZpA :,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); rb1`UG"h$  
 CDC tdc; >TQH|}|6(y  
 tdc.CreateCompatibleDC(&dc); +m8!U=Zi  
 CBitmap*pOld=tdc.SelectObject(&bm); &_~+(  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); PI`jExL  
 tdc.SelectObject(pOld); q o\?o    
 BITMAP btm; _io+YzS  
 bm.GetBitmap(&btm); d!:6[7X6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xZ4~Oo@@_'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z00+!Tnd  
 BITMAPINFOHEADER bih; P?t" jKp'  
 bih.biBitCount=btm.bmBitsPixel; qIY~dQ|  
 bih.biClrImportant=0; =!`j7#:  
 bih.biClrUsed=0; h\nI!{A0  
 bih.biCompression=0; NGOqy+Ty{f  
 bih.biHeight=btm.bmHeight; \hhmVt@@  
 bih.biPlanes=1; ]3g?hM6  
 bih.biSize=sizeof(BITMAPINFOHEADER); EI:w aIr  
 bih.biSizeImage=size; D3)zk@N  
 bih.biWidth=btm.bmWidth; );Z1a&K5k  
 bih.biXPelsPerMeter=0; ")V130<  
 bih.biYPelsPerMeter=0; b|+wc6   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2Z3('?\z~  
 static int filecount=0; U2`'qsR1  
 CString name; :cGt#d6  
 name.Format("pict%04d.bmp",filecount++); {K9/H qH  
 name=m_Path+name; _>9.v%5cs(  
 BITMAPFILEHEADER bfh; Ti'}MC+0  
 bfh.bfReserved1=bfh.bfReserved2=0; -u? S=h}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !!Aj<*%  
 bfh.bfSize=54+size; |7X:TfJ  
 bfh.bfOffBits=54; `;)\u  
 CFile bf; ik!..9aB  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ " t7M3i_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LxpuhvIO  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7oq[38zB  
  bf.WriteHuge(lpData,size); '1$!jmY  
  bf.Close(); q*2N{  
  nCount++; RTv qls  
 } lWqrU1Sjl  
 GlobalFreePtr(lpData); # g_Bx  
 if(nCount==1) RB+N IoQQ|  
  m_Number.Format("%d picture captured.",nCount); hWKJ,r%9;  
 else |i ZfYi&^  
  m_Number.Format("%d pictures captured.",nCount); >2< 8kBF_  
  UpdateData(FALSE); '3<fsK=  
} w^LuIbA  
5!EJxP9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v@wb"jdFi$  
{ [+OnV&  
 if(pMsg -> message == WM_KEYDOWN) D<V~f B  
 { =e8bNg  
  if(pMsg -> wParam == VK_ESCAPE) 2'5]~  
   return TRUE; vq!_^F<  
  if(pMsg -> wParam == VK_RETURN) 7f~Sf  
   return TRUE; _L@2_#h!  
 } ,2j.<g&   
 return CDialog::PreTranslateMessage(pMsg); 5vw{b?  
} ^|TG$`M(w  
xCYE B}o9r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Gkp< o  
{ dlG=Vq&Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j S]><rm  
  SaveBmp(); =IUUeFv +r  
  return FALSE; ZKXo-~=>  
} fgBM_c&9T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .VkbYK  
 CMenu pop; cKn`/\.H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 'w14sr%  
 CMenu*pMenu=pop.GetSubMenu(0); 8,atX+tc  
 pMenu->SetDefaultItem(ID_EXITICON); r" K':O6y  
 CPoint pt; lRv eHB&V  
 GetCursorPos(&pt); g7&9"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); E=cwq"  
 if(id==ID_EXITICON) ;s~X  
  DeleteIcon();  :<Fe  
 else if(id==ID_EXIT) =L C:SFzF  
  OnCancel(); 5* 0y7K/D  
 return FALSE; XEdzpkB  
} #rY sj-2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HU9Sl*/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4[BG#  
 AddIcon(); QjC22lW-  
 return res; gl]E_%tH  
} cetvQAGXY  
#^4,GLIM  
void CCaptureDlg::AddIcon() Vur bW=~g  
{ P) uDLFp]  
 NOTIFYICONDATA data; 8o/}}=m$  
 data.cbSize=sizeof(NOTIFYICONDATA); 5r?m&28X  
 CString tip; NuYkz"O]  
 tip.LoadString(IDS_ICONTIP); 1]}#)-  
 data.hIcon=GetIcon(0); Y2O"]phi@  
 data.hWnd=GetSafeHwnd(); ;/0 Q1-  
 strcpy(data.szTip,tip); !o>H1#2l  
 data.uCallbackMessage=IDM_SHELL; /[9t`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e5OsI Vtjr  
 data.uID=98; sg8/#_S1i  
 Shell_NotifyIcon(NIM_ADD,&data); M{$j  
 ShowWindow(SW_HIDE); )LdyC`S\c  
 bTray=TRUE; .-JCwnP  
} Q//,4>JKf  
&<+ A((/i  
void CCaptureDlg::DeleteIcon() 3mSXWl^?  
{ &E M\CjKv"  
 NOTIFYICONDATA data; <&!v1yR  
 data.cbSize=sizeof(NOTIFYICONDATA); 7Su#Je]  
 data.hWnd=GetSafeHwnd(); *A~ G_0B  
 data.uID=98; ;3 F"TH  
 Shell_NotifyIcon(NIM_DELETE,&data); >+mD$:L  
 ShowWindow(SW_SHOW); )NO<s0?&  
 SetForegroundWindow(); M gC:b-&5_  
 ShowWindow(SW_SHOWNORMAL); T<I=%P)  
 bTray=FALSE; m] W5+  
} E( h<$w8s  
JMCW}bA  
void CCaptureDlg::OnChange() qiZO _=0  
{ NWd<+-pC6  
 RegisterHotkey(); 4Td{;Y="yF  
} :aG#~-Q  
5'Q|EIL  
BOOL CCaptureDlg::RegisterHotkey() .>(Q)"v  
{ 1RKW2RCaW_  
 UpdateData(); :0/q5_t  
 UCHAR mask=0; < Z|Ep1W  
 UCHAR key=0; oxj3[</'k  
 if(m_bControl) g!i45-n3gt  
  mask|=4; *FfMI  
 if(m_bAlt) up2+ s#  
  mask|=2; unJ R=~E  
 if(m_bShift) U#n#7G6fRp  
  mask|=1; KK,Z"){  
  key=Key_Table[m_Key.GetCurSel()]; zFQ&5@43  
 if(bRegistered){ &wU'p-V  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8_&CT :u>  
  bRegistered=FALSE; !;Jmg  
 } BI:k#jO!  
 cMask=mask; *0_yT$  
 cKey=key; 9=,uq;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zyg:nKQW  
 return bRegistered; m>}8'N)  
} nr)c!8  
63!rUB!  
  四、小结 ?+c`]gO7N  
ZvGgmLN  
  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