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
  • 5331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: ^;\6ju2  
  ~+RrL,t#  
  一、实现方法 *_Pkb.3R  
jlUT9Zp  
  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: s <$*A;t  
s>>lf&7  
#pragma data_seg("shareddata") ,d=Dicaz  
HHOOK hHook =NULL; //钩子句柄 RzLeR%O  
UINT nHookCount =0; //挂接的程序数目 Z%r8oj\n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 : 9zEne4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :4"b(L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  M[R'  
static int KeyCount =0; 1JI7P?\B  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $"=0{H.?  
#pragma data_seg() w %6 L"  
Fy_~~nI0  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ??P3gA  
[t5 Dd  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: L>57eF)7  
UC00zW<Z@"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  3+M+5  
cKey,UCHAR cMask) XR#?gx.}  
{ >Y:veEa6v6  
 BOOL bAdded=FALSE; (1Jc-`  
 for(int index=0;index<MAX_KEY;index++){ KDDx[]1Q  
  if(hCallWnd[index]==0){ A2fuNV_  
   hCallWnd[index]=hWnd; C$v !emu  
   HotKey[index]=cKey; |B),N f|a  
   HotKeyMask[index]=cMask; '1 \UFz  
   bAdded=TRUE; f{]W*!VV-  
   KeyCount++; )L,Nh~  
   break; ~@D!E/hZx  
  } l~*d0E-$  
 } M3)Id?|]6  
 return bAdded; Vt4,?"  
} y#lg)nB  
//删除热键 VZA>ErB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FvBnmYn W  
{ N$8"X-na?  
 BOOL bRemoved=FALSE; s! sG)AR.J  
 for(int index=0;index<MAX_KEY;index++){ Lez]{%+.`[  
  if(hCallWnd[index]==hWnd){ KVpQ,x&q~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8RVeKnpXTV  
    hCallWnd[index]=NULL; |c,'0V,"cH  
    HotKey[index]=0; E0Kt4%b  
    HotKeyMask[index]=0; _eaK:EW  
    bRemoved=TRUE; ]=]`Mnuxb  
    KeyCount--; HR?a93  
    break; '494^1"io  
   } G0x!:[  
  } CH=k=)() ]  
 } 7{ QjE  
 return bRemoved; V%J_iY/BUb  
} -$y/*'  
O'W[/\A56M  
2fdC @V  
  DLL中的钩子函数如下: 5 |oi*b  
yrrP#F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y2y = P  
{ ]i'gU(+;`  
 BOOL bProcessed=FALSE; +r__>V,  
 if(HC_ACTION==nCode) 5cC)&}I  
 { %0eVm   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p{rzP,Pb&  
   switch(wParam) Pill |4c<  
   {  6 Zv~c(   
    case VK_MENU: LGC3"z\=  
     MaskBits&=~ALTBIT; M4}zRr([.5  
     break; &uu69)u  
    case VK_CONTROL: f1/i f:~6  
     MaskBits&=~CTRLBIT; C;rK16cn  
     break; xo(3<1mD  
    case VK_SHIFT: p/&s-G F  
     MaskBits&=~SHIFTBIT; d0 yZ9-t  
     break; %@[ ~s,6<  
    default: //judge the key and send message CLY>M`%?+p  
     break; 1`EkN0iZ  
   } fmk(}  
   for(int index=0;index<MAX_KEY;index++){ -gLU>I7wV  
    if(hCallWnd[index]==NULL) * n>YS  
     continue; |K$EULzz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]Y6y ]u  
    { i.>d#S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 17;qJ_T)  
     bProcessed=TRUE; Gv }~  
    } e{IwFX  
   } $PKUcT0N9  
  } Y\7/`ty  
  else if((lParam&0xc000ffff)==1){ //有键按下 aboA9pwH  
   switch(wParam) l#%G~c8x  
   { *Y9'tHI  
    case VK_MENU: MG0d&[  
     MaskBits|=ALTBIT; ]AdL   
     break; 5B+I\f&  
    case VK_CONTROL: q#1Cm Kt4R  
     MaskBits|=CTRLBIT; U~[ tp1Z)  
     break; wE09%  
    case VK_SHIFT: ?O#,|\v?]  
     MaskBits|=SHIFTBIT; V']1j  
     break; u-#J!Z<T8  
    default: //judge the key and send message !5h@uar  
     break; I)cA:Ip  
   } u1i ?L'  
   for(int index=0;index<MAX_KEY;index++){ ++M%PF [ {  
    if(hCallWnd[index]==NULL) Z"g6z#L&  
     continue; bjGQ04da  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C*,PH!$k  
    { 7W\aX*]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dRnO5 7+{  
     bProcessed=TRUE; fIg~[VN"  
    } Av^<_`L :  
   }  k8ej.  
  } p3z%Y$!Tm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 N"o+;yR  
   for(int index=0;index<MAX_KEY;index++){ @)p?!3{"  
    if(hCallWnd[index]==NULL) O_ /|Wx  
     continue; ~l>2NY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,*'aH z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #`{L_n$c  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 j+>&~  
   } - -H%FYF`  
  } :~+m9r  
 } w?zY9Fs=s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tR% &.,2  
} i$W=5B>SO  
>4eZ%</D5  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: R?GF,s<j  
ZpQ8KY$ 5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 04cNi~@m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r:uW(<EP^  
Di8;Tq  
  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: \mp5G&+/Q  
[xsiSt?6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) iKN800^u  
{ ck4g=QpD{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) tM;S )S(=  
 { P_3U4J  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 G`r*)pdm  
  SaveBmp(); [E/}-m6g  
  return FALSE; )!(etB=`y  
 } JqmKD4p  
 …… //其它处理及默认处理 /Jci1o  
} 9 ]W4o"  
w_eUU)z  
o|0QstSCl  
  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。 9F"Q2^l'  
/*yPy?  
  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。 a2N4Jg@  
@ag*zl  
  二、编程步骤 @n:.D9  
D&r2k 9  
  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"; J=qPc}+  
H0.,h;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }8cX0mZ1j  
$1$T2'C~+  
  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; ;BMm47<  
rCa2$#Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; z7P] g C$\  
=q-HR+  
  5、 添加代码,编译运行程序。 Rr>h8Ni <  
hPHrq{YZ  
三、程序代码 Du2v,n5@  
!HP/`R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL P?P))UB5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) j L[ hB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ J6Q}a7I#  
#if _MSC_VER > 1000 DfQD!}=  
#pragma once az2CFd^M  
#endif // _MSC_VER > 1000 8fwM)DKS  
#ifndef __AFXWIN_H__ .xp|w^  
#error include 'stdafx.h' before including this file for PCH Ew kZzVuX  
#endif t846:Z%[  
#include "resource.h" // main symbols a:3f>0_t  
class CHookApp : public CWinApp ;c_pa0L  
{ w+0Ch1$  
 public: /o_h'l|PS  
  CHookApp(); )4P5i b  
  // Overrides Qe )#'$T  
  // ClassWizard generated virtual function overrides axW4 cS ?  
  //{{AFX_VIRTUAL(CHookApp) hj.Du+1  
 public: sR1 &2hB  
  virtual BOOL InitInstance(); Z|kMoB  
  virtual int ExitInstance(); >O{/%(9  
  //}}AFX_VIRTUAL uF=xo`=|  
  //{{AFX_MSG(CHookApp) yNb :zoT  
  // NOTE - the ClassWizard will add and remove member functions here. sC .R.  
  // DO NOT EDIT what you see in these blocks of generated code ! {PCf'n  
  //}}AFX_MSG 'Na/AcRdg  
  DECLARE_MESSAGE_MAP() .{|AHW&0<  
}; !cWnQRIt_F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j>0~"A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9#;UQ.qA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); igW>C2J  
BOOL InitHotkey(); rpNe8"sh  
BOOL UnInit(); *G{Zo*2< i  
#endif G Riu]   
Q4;br ?2H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. RO"*&o'K'  
#include "stdafx.h" y=jTS  
#include "hook.h" \O7?!i  
#include <windowsx.h> Tcglt>tj"  
#ifdef _DEBUG Ht'jm(  
#define new DEBUG_NEW '\2lWR]ndd  
#undef THIS_FILE Z)U#5|sf  
static char THIS_FILE[] = __FILE__; ;')T}wuq  
#endif 0CD2o\`8  
#define MAX_KEY 100 G"BoD5m  
#define CTRLBIT 0x04 ):_x  
#define ALTBIT 0x02 d%istFL)  
#define SHIFTBIT 0x01 Z0~}'K   
#pragma data_seg("shareddata") 995^[c1o6  
HHOOK hHook =NULL; ,K'}<dm|x  
UINT nHookCount =0; Lu~e^Ul   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey GZN@MK*co  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z^f-MgWG  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey CDcs~PR@B  
static int KeyCount =0; h,@x5q>g  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Wb4%=2Qn  
#pragma data_seg() \4SFD 3$&  
HINSTANCE hins; uK?T <3]'  
void VerifyWindow(); $Q:5KNF+p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 7<=7RPWmD  
//{{AFX_MSG_MAP(CHookApp) i#jCf3%+ h  
// NOTE - the ClassWizard will add and remove mapping macros here. ^saJfr x  
// DO NOT EDIT what you see in these blocks of generated code!  5m+:GiI  
//}}AFX_MSG_MAP / N@0qQ  
END_MESSAGE_MAP() pg~`NN  
} V4"-;P  
CHookApp::CHookApp()  *ihg'  
{ w?AE8n$8  
 // TODO: add construction code here, Oz9k.[j(  
 // Place all significant initialization in InitInstance ubhem(p#  
} oh;F]*k6  
b>%I=H%g  
CHookApp theApp; ^3`98y.Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s 8``U~D   
{ is}Fy>9i  
 BOOL bProcessed=FALSE; na FZ<'t>&  
 if(HC_ACTION==nCode) Q9[dUdQm  
 { U[S;5xeF.j  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^;YD3EZw  
   switch(wParam) i[ BR"(  
   { 2|~& x~  
    case VK_MENU: ?<  w +{  
     MaskBits&=~ALTBIT; "VWxHRVg4M  
     break; s=huOjKL]  
    case VK_CONTROL: k#%19B  
     MaskBits&=~CTRLBIT; |y%pP/;&!  
     break; 0;TMwE  
    case VK_SHIFT: sZ'3PNpCP  
     MaskBits&=~SHIFTBIT; ?NI)3-l  
     break; !00%z  
    default: //judge the key and send message ,XP9NHE  
     break; i=2+1 ;K  
   } #U/B,`= >  
   for(int index=0;index<MAX_KEY;index++){ [uRsB5  
    if(hCallWnd[index]==NULL) g{$&j*Q9  
     continue; (oJ#`k:&n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2 ;B[n;Q{  
    { rMlbj2T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XB;;OP12  
     bProcessed=TRUE; 73xI8  
    } l}AB):<Z  
   } ^:-%tpB#!  
  } Gz*U?R-T  
  else if((lParam&0xc000ffff)==1){ //Key down dm$:xE":  
   switch(wParam) kd \G>  
   { .yWdlq##  
    case VK_MENU: Fr%KO)s2  
     MaskBits|=ALTBIT; udc9$uO  
     break; `%ymg8^  
    case VK_CONTROL: 0/KNXz  
     MaskBits|=CTRLBIT; &U 'Ds!  
     break; g1J]z<&  
    case VK_SHIFT: f\(Kou$  
     MaskBits|=SHIFTBIT; jv0e&rt  
     break; >8NQ8i=]V1  
    default: //judge the key and send message >Ft jrEB  
     break; `Ze fSmb  
   } FpRK^MEkG  
   for(int index=0;index<MAX_KEY;index++) #3CA  
   { hV8A<VT  
    if(hCallWnd[index]==NULL) Pq4sv`q)S  
     continue; SyYa_=En  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ve7Is`/  
    { -`?V8OwY]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d'-^ VxO0  
     bProcessed=TRUE; Dkdm~~Rr  
    } \aW5V:?  
   } Hh@mIusj  
  } v5$zz w  
  if(!bProcessed){ A`r&"i OKA  
   for(int index=0;index<MAX_KEY;index++){ Y2$ % %@  
    if(hCallWnd[index]==NULL) 3]VTQl{P  
     continue; t1~*q)!Mo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #-V Kk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w|5}V6WD  
   } Z=H f OC  
  } i([A8C_A  
 } etDB|(,z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |]]fcJOBP  
} H+0 *  
Aqm0|GlJ  
BOOL InitHotkey() Y|lMa?\E  
{ Kc{wv/6}T  
 if(hHook!=NULL){ T@S+5(  
  nHookCount++; ]jYl:41yI  
  return TRUE; dvj`%?=  
 } ,,iQG' *  
 else r-V./M@L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); l;;:3:  
  if(hHook!=NULL) W.CIyGK  
   nHookCount++; >3Y&jsh<  
  return (hHook!=NULL); Je*gMq:D  
} [,e_2<   
BOOL UnInit() rj5:Y QEH;  
{ -FPl",f=r  
 if(nHookCount>1){ F% |(pHk  
  nHookCount--; kR_[p._  
  return TRUE; PRUGUHY  
 } CRf^6k_;(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); {M$8V~8D  
 if(unhooked==TRUE){ %q!nTG U~  
  nHookCount=0; 7)]G"m{  
  hHook=NULL; A6Qi^TI  
 } 4@Qq5kpk*  
 return unhooked; l-npz)EM  
} }Ag2c; aaq  
2-CK:)n/#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2]'ozs$|v  
{ w])Sz*J  
 BOOL bAdded=FALSE; 9!OpW:bR|  
 for(int index=0;index<MAX_KEY;index++){ KG?]MVXA  
  if(hCallWnd[index]==0){ T<?;:MO88  
   hCallWnd[index]=hWnd; D;E&;vP6%  
   HotKey[index]=cKey; >9klh-f  
   HotKeyMask[index]=cMask; = G_6D  
   bAdded=TRUE; j?,$*Fi  
   KeyCount++; 0jyokER  
   break; 2,fB$5+  
  } R3<+z  
 } $200?[  
 return bAdded; Ylf4q/-  
} npF[J x[  
f0uiNy(r$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^m7PXY  
{ YUH/ tl  
 BOOL bRemoved=FALSE; AX)zSrXn  
 for(int index=0;index<MAX_KEY;index++){ BOG )JaDW  
  if(hCallWnd[index]==hWnd){ x{- caOH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +1y#=iM{  
    hCallWnd[index]=NULL; yqU++;6  
    HotKey[index]=0; I@B7uFj  
    HotKeyMask[index]=0; bM'AD[  
    bRemoved=TRUE; Ob6vg^#  
    KeyCount--; ibq@0CR  
    break; rx"zqm9 }u  
   } Gg+>_b{S5T  
  } 4j*}|@x  
 } WAEKvM4*i0  
 return bRemoved; : )z_q!$j  
} :s5g6TR  
O<hHo]jLF  
void VerifyWindow() 3,[2-obmi  
{ qq` RfZjL  
 for(int i=0;i<MAX_KEY;i++){ \z{Y(dS  
  if(hCallWnd!=NULL){ |bk*Lgkzw  
   if(!IsWindow(hCallWnd)){ U!5@$Fu  
    hCallWnd=NULL; anvj{1  
    HotKey=0; xI@~Ig  
    HotKeyMask=0; d.Z]R&X08  
    KeyCount--; r~TT c)2  
   } MXy{]o_H~  
  } aI<~+]  
 } 1gE`_%?K  
} !2Orklzd1  
A0XFu}  
BOOL CHookApp::InitInstance() U,=K_oBAq  
{ x6t;=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y!L jy [/  
 hins=AfxGetInstanceHandle(); E;qwoTmul  
 InitHotkey(); 1bBK1Uw  
 return CWinApp::InitInstance(); JvDsr0]\#  
} WdT|xf.Q&  
_(hwU>.  
int CHookApp::ExitInstance() vf2K2\fn  
{ |(S W  
 VerifyWindow(); 7'|PHQ?S  
 UnInit(); j#&  
 return CWinApp::ExitInstance(); >=V+X"\Z  
} 6"GpE5'*  
~K9U0ypH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xeI{i{8  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e0L;V@R  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a5-\=0L~  
#if _MSC_VER > 1000 my1kF%?  
#pragma once a%dx\&K  
#endif // _MSC_VER > 1000 pd#/;LT  
b5DrwX{Ff  
class CCaptureDlg : public CDialog L,6Y=?  
{ HhL%iy1  
 // Construction |=LkV"_v  
 public: FT~^$)8=  
  BOOL bTray; 4i,SiFKB  
  BOOL bRegistered; Bu1z$#AC  
  BOOL RegisterHotkey(); #lF<="y%X  
  UCHAR cKey; K(gj6SrjV  
  UCHAR cMask; *3$,f>W^  
  void DeleteIcon(); HhvG#Sam!  
  void AddIcon(); {<kG{i/  
  UINT nCount; z(3"\ ^T  
  void SaveBmp(); 8|({ _Z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor MxRU6+a  
  // Dialog Data _ ^{Ep/ME=  
  //{{AFX_DATA(CCaptureDlg) f[b YjIX  
  enum { IDD = IDD_CAPTURE_DIALOG }; N-gRfra+8L  
  CComboBox m_Key; 6<Z: Xw  
  BOOL m_bControl; E: GJ$I  
  BOOL m_bAlt; $J6.a!5IE  
  BOOL m_bShift; .jp]S4~  
  CString m_Path; \#aVu^`eX  
  CString m_Number; 9$&e~^&B  
  //}}AFX_DATA ~t={ \,X\  
  // ClassWizard generated virtual function overrides F"xO0t  
  //{{AFX_VIRTUAL(CCaptureDlg) ~-5@- V  
 public: iIE(zw)H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <^U(ya  
 protected: _sVs6AJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $]kg_l)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [.X%:H+  
  //}}AFX_VIRTUAL  2JP?6N  
  // Implementation KeB4Pae|V  
 protected: _m],(J=,z  
  HICON m_hIcon; )\-";?sYky  
  // Generated message map functions Zjg\jo  
  //{{AFX_MSG(CCaptureDlg) "ILWIzf.]  
  virtual BOOL OnInitDialog(); ?Z>.G{Wm@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "!tw ,Gp  
  afx_msg void OnPaint(); AiZFvn[n8  
  afx_msg HCURSOR OnQueryDragIcon(); A+I&.\QAR  
  virtual void OnCancel(); 4_+Pv6  
  afx_msg void OnAbout(); K//T}-Uub  
  afx_msg void OnBrowse(); VA'X!(Cv  
  afx_msg void OnChange(); }4SSo)Uv/  
 //}}AFX_MSG Y/H^*1  
 DECLARE_MESSAGE_MAP() _wNPA1q0J  
}; b`W*vduf  
#endif LUck>l\l  
wy {>gvqK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Z=@)  
#include "stdafx.h" 6 ]Oxx{|}  
#include "Capture.h" d&uTiH?0  
#include "CaptureDlg.h" m > (h_j  
#include <windowsx.h> .dT;T%3fO  
#pragma comment(lib,"hook.lib") xGfD z*t  
#ifdef _DEBUG R9h>I3F=c  
#define new DEBUG_NEW 4q13xX  
#undef THIS_FILE c1kxKxE  
static char THIS_FILE[] = __FILE__; W@,p9=425  
#endif KC:4  
#define IDM_SHELL WM_USER+1  YX`=M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T:dm0iau  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _AYC|R|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; EWIc|b:  
class CAboutDlg : public CDialog 3]<re{)J9O  
{ *frJ^ Ws{  
 public: liqR#<  
  CAboutDlg(); iN_D8dI  
  // Dialog Data =5~F6to  
  //{{AFX_DATA(CAboutDlg) <m,yFk  
  enum { IDD = IDD_ABOUTBOX }; K;p<f{PE  
  //}}AFX_DATA BD7@Mj*|  
  // ClassWizard generated virtual function overrides Pzp+I}  
  //{{AFX_VIRTUAL(CAboutDlg) pXh~#o6 V  
 protected: K\+}q{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &4Con%YU[  
  //}}AFX_VIRTUAL d:hL )x  
  // Implementation sD8 m<   
 protected: NOr <,  
  //{{AFX_MSG(CAboutDlg) }{xN`pZ  
  //}}AFX_MSG <;cE/W}}  
  DECLARE_MESSAGE_MAP() _/}Hqh  
}; ;Q=GJ5`B  
U`8 |9v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^2^|AXNES  
{ 5!F\h'E  
 //{{AFX_DATA_INIT(CAboutDlg) ZBmXaP[9  
 //}}AFX_DATA_INIT #RM3^]h  
} F|l`YtZZd  
=6L*!JP<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `{U%[$<[W  
{ y[p$/$bgC5  
 CDialog::DoDataExchange(pDX); q{cp|#m#G  
 //{{AFX_DATA_MAP(CAboutDlg) 3z)"U  
 //}}AFX_DATA_MAP LxlbD#<V  
} 7~"(+f  
J+b!6t}mZn  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /3Nb  
 //{{AFX_MSG_MAP(CAboutDlg) Pc)VK>.fc  
 // No message handlers U2V^T'Y[  
 //}}AFX_MSG_MAP g[s\~MF@s  
END_MESSAGE_MAP() /^LH  
*)bd1B#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B9e.-Xaf  
: CDialog(CCaptureDlg::IDD, pParent) |Vwc/9`t]>  
{ g T XW2S  
 //{{AFX_DATA_INIT(CCaptureDlg) +K;Y+ K&;2  
  m_bControl = FALSE; X#DL/#z k  
  m_bAlt = FALSE; ')5L_$  
  m_bShift = FALSE; wfDp,T3w7  
  m_Path = _T("c:\\"); lMwk.#  
  m_Number = _T("0 picture captured."); [.;%\>Qk<  
  nCount=0; Kr/h`RM  
  bRegistered=FALSE; N(:nF5>_  
  bTray=FALSE; 4e@&QOo`Cu  
 //}}AFX_DATA_INIT H+VO.s.a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _7lt(f[S  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); HX3D*2v":  
} ],\sRQbv&  
wKk 3)@il  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hu P^2*c  
{ &^&$!Xmu9  
 CDialog::DoDataExchange(pDX); [O7w =  
 //{{AFX_DATA_MAP(CCaptureDlg) DhLr^Z!h3;  
  DDX_Control(pDX, IDC_KEY, m_Key); uZ\wwYY#M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^E$(1><-a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sK@Y!oF}\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _k_>aG23  
  DDX_Text(pDX, IDC_PATH, m_Path); rToaGQh  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "[*S?QO(L  
 //}}AFX_DATA_MAP /WgPXEB  
} =Y &9 qt  
}UKgF.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WVS$O99Y  
//{{AFX_MSG_MAP(CCaptureDlg) LBmM{Gu  
 ON_WM_SYSCOMMAND() 9DOkQnnc  
 ON_WM_PAINT() UU iNR  
 ON_WM_QUERYDRAGICON() %1\v7Xw{9  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D[89*@v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZT) !8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Cf0|Z  
//}}AFX_MSG_MAP *$i;o3  
END_MESSAGE_MAP() 6| *(dE2x(  
7q%|4Z-~  
BOOL CCaptureDlg::OnInitDialog() ^^7L"je]g  
{ euV$2Fg  
 CDialog::OnInitDialog(); @s%X  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i}PK $sa#c  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?}'N_n ys  
 CMenu* pSysMenu = GetSystemMenu(FALSE); J?UA:u  
 if (pSysMenu != NULL) [)#u<lZ<~  
 { /Jxq 3D)v  
  CString strAboutMenu; m$fQ`XzU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); h@*lWi2K7  
  if (!strAboutMenu.IsEmpty()) qDnCn H  
  { nnt8 sf@\  
   pSysMenu->AppendMenu(MF_SEPARATOR); O87"[c`>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); { p1lae  
  } v:r D3=M-  
 } 6exI_3A4jh  
 SetIcon(m_hIcon, TRUE); // Set big icon YBX)eWslK  
 SetIcon(m_hIcon, FALSE); // Set small icon (U|)xA]y!  
 m_Key.SetCurSel(0); XC|*A$x,  
 RegisterHotkey(); )v%l0_z{  
 CMenu* pMenu=GetSystemMenu(FALSE); z,pNb%*O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6xH;: B)d  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X=v~^8M7%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5>k>L*5J  
 return TRUE; // return TRUE unless you set the focus to a control wgY6D!Y   
} ?gLR<d_  
zlH28V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9s! 2 wwh  
{ vO\:vp4fH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t]s94 R q  
 { ~?#~Ar  
  CAboutDlg dlgAbout; 8r,9OM  
  dlgAbout.DoModal(); m_a^RB(  
 } gaQ[3g  
 else NW z9C=y  
 { N 0+hejz  
  CDialog::OnSysCommand(nID, lParam); Da-u-_~  
 } B@ -|b  
} A9 U5,mOz  
k+FMZ, D|  
void CCaptureDlg::OnPaint() s(teQ\  
{ p-.Ri^p   
 if (IsIconic()) cZqfz  
 { *kP;{Cb`  
  CPaintDC dc(this); // device context for painting Pp ,Um(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "tqnx?pM  
  // Center icon in client rectangle yahAD.Xuo@  
  int cxIcon = GetSystemMetrics(SM_CXICON); R.K?  
  int cyIcon = GetSystemMetrics(SM_CYICON); Hi^35  
  CRect rect; J*5hf:?i  
  GetClientRect(&rect); 14mf}"z\  
  int x = (rect.Width() - cxIcon + 1) / 2; Q4RpK(N  
  int y = (rect.Height() - cyIcon + 1) / 2; k@S)j<  
  // Draw the icon '=VH6@vZ_'  
  dc.DrawIcon(x, y, m_hIcon); 9I85EcT^4"  
 } ton1oq  
 else %NNj9Bl<VV  
 { DKX/W+#a  
  CDialog::OnPaint(); kP@H G<~  
 } IXnb]q.  
} TN5>"? ?"  
oz LH]*  
HCURSOR CCaptureDlg::OnQueryDragIcon() eNtf#Rqym  
{ ]DO&x+Rb  
 return (HCURSOR) m_hIcon; e,(a6X  
} t<Ot|Ex  
xk& NAB  
void CCaptureDlg::OnCancel() )i;un.  
{ _6ZzuVv3/  
 if(bTray) +p9- .YM  
  DeleteIcon(); I_ONbJ9]  
  CDialog::OnCancel(); vv+km+  
} }MP>]8Aq  
]Ko^G_Rm  
void CCaptureDlg::OnAbout() )IHG6}<  
{ Nb0Ik/:<  
 CAboutDlg dlg; k@yh+v5  
 dlg.DoModal(); 3A_G=WaED  
} \^jjK,OK  
C0QM#"[  
void CCaptureDlg::OnBrowse() /,!<Va;~  
{ Q^L) Vp"  
 CString str; 3f"C!l]Xu  
 BROWSEINFO bi; + ~ "5!  
 char name[MAX_PATH]; jXixVNw  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e?b)p5g  
 bi.hwndOwner=GetSafeHwnd(); 5Q W}nRCZ  
 bi.pszDisplayName=name; ZWS2q4/S  
 bi.lpszTitle="Select folder"; 802H$P^ps  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V C-d0E0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =>qTNh*'  
 if(idl==NULL) A{N\)  
  return; eNbpwne  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2VA!&`I  
 str.ReleaseBuffer(); [KSH~:h:NR  
 m_Path=str; )qv2)a!H  
 if(str.GetAt(str.GetLength()-1)!='\\') ,beS0U]  
  m_Path+="\\"; QOH<]~3J  
 UpdateData(FALSE); Ke!'gohv  
} X3',vey  
dxK9:IX  
void CCaptureDlg::SaveBmp() k=$AhT=e}n  
{ 1yM r~Fo  
 CDC dc; 7VAJJv3  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b5<okICD  
 CBitmap bm; ~Wei|,w'<  
 int Width=GetSystemMetrics(SM_CXSCREEN); /`3 #4=5-  
 int Height=GetSystemMetrics(SM_CYSCREEN); FQk!d$BG  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?{6s58Q{  
 CDC tdc; &l m#  
 tdc.CreateCompatibleDC(&dc); Ab2Q \+,  
 CBitmap*pOld=tdc.SelectObject(&bm); I-kWS 4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KnGTcoXg_  
 tdc.SelectObject(pOld);  .t =  
 BITMAP btm; V%*b@zv  
 bm.GetBitmap(&btm); T7[NcZ:I  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; WF[bO7:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); F'FP0t!S  
 BITMAPINFOHEADER bih; O6X"RsI}  
 bih.biBitCount=btm.bmBitsPixel; C h19h8M  
 bih.biClrImportant=0; 1& ^?U{  
 bih.biClrUsed=0; '#.#$8l  
 bih.biCompression=0; "g0(I8  
 bih.biHeight=btm.bmHeight; 0 ipN8Pg+  
 bih.biPlanes=1; Hr^3`@}#1  
 bih.biSize=sizeof(BITMAPINFOHEADER); g9~]s 9  
 bih.biSizeImage=size; r|eZv<6  
 bih.biWidth=btm.bmWidth; @kxel`,$e  
 bih.biXPelsPerMeter=0; IeP WOpj3  
 bih.biYPelsPerMeter=0; TB!(('  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); T^:fn-S}=  
 static int filecount=0; }r%X`i|  
 CString name; O"Q7Rx  
 name.Format("pict%04d.bmp",filecount++); sOpep  
 name=m_Path+name; <%P2qgz5  
 BITMAPFILEHEADER bfh; D +RiM~LH8  
 bfh.bfReserved1=bfh.bfReserved2=0; y(i Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); h&;t.Gdf  
 bfh.bfSize=54+size; nB5zNyY4  
 bfh.bfOffBits=54; k XrlSaIc  
 CFile bf; KOh A)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ fuMJdAuY7d  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^5; `-Ky  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2VoKr)  
  bf.WriteHuge(lpData,size); _>yoX  
  bf.Close(); Uz dc  
  nCount++; aG%, cQ1  
 } f-SuM% S_  
 GlobalFreePtr(lpData); JSr$-C fH  
 if(nCount==1) Qdf=XG5  
  m_Number.Format("%d picture captured.",nCount); S1S;F9F  
 else = 1.9/hW  
  m_Number.Format("%d pictures captured.",nCount); bt$)Xu<R  
  UpdateData(FALSE); y*23$fj(  
} k{I 01  
. (}1%22  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \ck+GW4&  
{ (Pbg[AY  
 if(pMsg -> message == WM_KEYDOWN) y3G `>  
 { bZ1 78>J]  
  if(pMsg -> wParam == VK_ESCAPE) r] Lc9dL  
   return TRUE; ~Z'w)!h  
  if(pMsg -> wParam == VK_RETURN) sN6N >{  
   return TRUE; T~:|!`  
 } 4\M.6])_   
 return CDialog::PreTranslateMessage(pMsg); EYX$pz(x;  
} -E4XIn  
Sa1 l=^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) iyta;dw9  
{ >>{FzR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %9oYw9 H!  
  SaveBmp(); O1'm@ q)  
  return FALSE; 2lVHZ\G  
} "Wo,'8{v  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NnT g3:.  
 CMenu pop; $~;D9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -E"GX  
 CMenu*pMenu=pop.GetSubMenu(0); /X'(3'a  
 pMenu->SetDefaultItem(ID_EXITICON); G 2!xPHz  
 CPoint pt; fw6UhG  
 GetCursorPos(&pt); ^= 0m-/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q[F}r`  
 if(id==ID_EXITICON) ^ vilgg~  
  DeleteIcon();  rl2&^N  
 else if(id==ID_EXIT) :GpDg  
  OnCancel(); UMl#D >:C<  
 return FALSE; NKb1LbnZ*y  
} \*f;Xaa  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); e [_m< e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) : j }fC8'  
 AddIcon(); zOgTQs"ZH  
 return res; 03E4cYxt5  
} 4k-+?L!/G  
*jIqAhs0{  
void CCaptureDlg::AddIcon() mE%$HZ}  
{ _j?e~w&0b  
 NOTIFYICONDATA data; _WXtB#  
 data.cbSize=sizeof(NOTIFYICONDATA); l>*"mh  
 CString tip; 2owEw*5jl/  
 tip.LoadString(IDS_ICONTIP); o]:3H8  
 data.hIcon=GetIcon(0); Bw%Qbs0Q  
 data.hWnd=GetSafeHwnd(); xj5;: g#!  
 strcpy(data.szTip,tip); U8qtwA9t  
 data.uCallbackMessage=IDM_SHELL; W"^wnGa@a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t58e(dgi  
 data.uID=98; b306&ZVEk  
 Shell_NotifyIcon(NIM_ADD,&data); B(xN Gs  
 ShowWindow(SW_HIDE); <S?ddp2  
 bTray=TRUE; < -W*$?^  
} MUfG?r\t  
Q'_z<V  
void CCaptureDlg::DeleteIcon() J Ro?s~Ih  
{ B#/Q'V  
 NOTIFYICONDATA data; 0c K{  
 data.cbSize=sizeof(NOTIFYICONDATA); E|'h]NY  
 data.hWnd=GetSafeHwnd(); M@0;B30L  
 data.uID=98; )jrV#/m9  
 Shell_NotifyIcon(NIM_DELETE,&data); /|6;Z}2  
 ShowWindow(SW_SHOW); g~(E>6Y  
 SetForegroundWindow(); 0d8%T<=J  
 ShowWindow(SW_SHOWNORMAL); \+aC"#+0  
 bTray=FALSE; 5onm]V]  
} V3 ~~  
P ;IrBq6|o  
void CCaptureDlg::OnChange() y WV#Up  
{ AL>$HB$  
 RegisterHotkey(); qOIW(D  
} q.,JVGMS  
23 ~ Sjr  
BOOL CCaptureDlg::RegisterHotkey() Aq3}Ng  
{ 5^^XQ?"  
 UpdateData(); 8\:NMP8W\  
 UCHAR mask=0; p<M\U"5Ye  
 UCHAR key=0; Y>'|oygHA  
 if(m_bControl) cM&{+el  
  mask|=4; 5mb]Q)f9-  
 if(m_bAlt) EkziAON  
  mask|=2; jH_JmYd  
 if(m_bShift) BcI |:qv|  
  mask|=1; xyI}y(CN1  
  key=Key_Table[m_Key.GetCurSel()]; /7gOSwY  
 if(bRegistered){ q$=#A7H>3)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); (<^yqH?  
  bRegistered=FALSE; w*R$o  
 } XQw>EZdj_N  
 cMask=mask; L|p Z$HB  
 cKey=key; Ol!ntNhXm  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _%QhOY5tv"  
 return bRegistered; nqLA}u4IM  
} }iuWAFZbGS  
j_Yp>=+[  
  四、小结 I_RsYw  
qgfi\/$6  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
10+5=?,请输入中文答案:十五