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
  • 5317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: }lfn0 %(@  
  )H+kB<n  
  一、实现方法 t[2i$%NVM  
<t}?$1  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: /`+7_=-  
~:2K#q5C  
#pragma data_seg("shareddata") 8:{ q8xZ=k  
HHOOK hHook =NULL; //钩子句柄 tWk{1IL  
UINT nHookCount =0; //挂接的程序数目 zM59UQU;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yGEb7I$h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9X]f[^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey D/s?i[lb  
static int KeyCount =0; D'L{wm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  ;Qa;@  
#pragma data_seg() detLjlE  
;.s: X  
  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。 t)I0lnbs  
\"d?=uFe  
  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: =Ahw%`/&}]  
v*r9j8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z[} $n-V  
cKey,UCHAR cMask) "$8w.C  
{ p>p'.#M  
 BOOL bAdded=FALSE; gpAHC   
 for(int index=0;index<MAX_KEY;index++){ s*JE)  
  if(hCallWnd[index]==0){ Qp!J:YV  
   hCallWnd[index]=hWnd; o}~3JBn T  
   HotKey[index]=cKey; &=zU611,  
   HotKeyMask[index]=cMask; sXB+s  
   bAdded=TRUE; V2<i/6~  
   KeyCount++; >&hX&,hG  
   break; m2b`/JW  
  } w3bIb$12  
 } u^=@DO'  
 return bAdded; YMu)  
} a8JN19}D  
//删除热键 },PBqWe  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UC|JAZL  
{ hTTfJDF  
 BOOL bRemoved=FALSE; G (\Ckf:  
 for(int index=0;index<MAX_KEY;index++){ RgGA$HN/  
  if(hCallWnd[index]==hWnd){ p >aw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8]C1K Zs  
    hCallWnd[index]=NULL; 7) 0q--B  
    HotKey[index]=0; D5` (}  
    HotKeyMask[index]=0; b1=pO]3u  
    bRemoved=TRUE; p7UTqKi  
    KeyCount--; @L;C_GEa  
    break; XS|mKuMc C  
   } J px'W  
  } f)^t')  
 } B] i:)   
 return bRemoved; M(5D'4.  
} m!Af LSlwm  
/*P7<5n0  
b-nYxd  
  DLL中的钩子函数如下: mV zu~xym  
*<k&#D"m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O+FBQiv  
{ N84qcc  
 BOOL bProcessed=FALSE; t/ eo]  
 if(HC_ACTION==nCode) PYieD}'  
 { + *a7GttU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 IJIQ" s  
   switch(wParam) o?dR\cxj  
   {  la702)N{  
    case VK_MENU: PP-kz;|  
     MaskBits&=~ALTBIT; hbnS~sva  
     break; >zR14VO`_|  
    case VK_CONTROL: +H}e)1^ I  
     MaskBits&=~CTRLBIT; D3.VXuKn6  
     break; T6=-hA^A  
    case VK_SHIFT: ;eh/_hPM  
     MaskBits&=~SHIFTBIT; ]xrD<  
     break; " $=qGHA~  
    default: //judge the key and send message SG`)PW?  
     break; #eLN1q&Z  
   } )* 3bkKVB  
   for(int index=0;index<MAX_KEY;index++){ ,s? dAy5  
    if(hCallWnd[index]==NULL) fq(5Lfe}  
     continue; ITc `]K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8[HZ@@  
    { @g\;` #l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _BwKY#09Zp  
     bProcessed=TRUE; yoW> BX  
    } 5)*6V&  
   } 4:`[qE3  
  } raHVkE{<  
  else if((lParam&0xc000ffff)==1){ //有键按下 2Oi'E  
   switch(wParam) Y^3)!>  
   { m&cvU>lC  
    case VK_MENU: Hf_'32e3<  
     MaskBits|=ALTBIT; H;wR  
     break; >{F!ntEj  
    case VK_CONTROL: os_WYQ4>j  
     MaskBits|=CTRLBIT; dyl 0]Z  
     break; LYNZP4(R  
    case VK_SHIFT: @<5Tba>SC  
     MaskBits|=SHIFTBIT; sDAK\#z  
     break; k}<<bm*f  
    default: //judge the key and send message 2_N/wR#=&  
     break; w&C1=v -h  
   } #%WCL'6B  
   for(int index=0;index<MAX_KEY;index++){ [DhEh@  
    if(hCallWnd[index]==NULL) 1t#XQ?8  
     continue; .FJ j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -%=RFgU4  
    { N"~ qoJO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); GoL|iNW`  
     bProcessed=TRUE; YM8rJ-  
    } (GNEYf|  
   } L ]*`4 L  
  } 7@@<5&mN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 LU G9 #.  
   for(int index=0;index<MAX_KEY;index++){  feN!_ -  
    if(hCallWnd[index]==NULL) j%u8=  
     continue; E@mkm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) HT-PWk>2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !U[:5@s06  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Pv[ykrm/  
   } FH[#yq.Pr  
  } + "zYn!0  
 } )r pD2H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {s9<ej~<R  
} I3An57YV].  
M#T#:wf~  
  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: qzHU)Ns(_  
~.H~XK w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *F..ZS'$[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Onyh1  
n5\}KZh  
  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: <dS5|||  
> '.[G:b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vuW-}fY;  
{ _1\poAy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?ff [$ab  
 { %VS 2M #f  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c l9$g7  
  SaveBmp(); SlT7L||Ww  
  return FALSE; ;tXY =  
 } hWm0$v 1p  
 …… //其它处理及默认处理 @x*.5:[  
} EFD?di)s  
b( 1 :w"wD  
d96fjj~  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 S,VyUe4P4  
YLE/w@*  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 IOS^|2:,  
G-ZhGbAI7  
  二、编程步骤 e]Puv)S>{8  
x?gQ\ 0S<  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; K,]woNxaw  
r\B"?oqC  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y%FYXwR{  
gz#+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; =~ '^;D  
zNwc((  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; !9PX\Xbn  
*iYMX[$  
  5、 添加代码,编译运行程序。 vU7&'ca  
EFeAr@nj  
三、程序代码 T"IW Jpc  
1B(G]o_>!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL zv,\@Z9.($  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i:{:xKiCa  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ PQi }Evxa  
#if _MSC_VER > 1000 fmBkB8  
#pragma once >r~|1kQ.  
#endif // _MSC_VER > 1000 /K[]B]1NE  
#ifndef __AFXWIN_H__ ^SgN(-QH  
#error include 'stdafx.h' before including this file for PCH $.;iu2iyo  
#endif K(' 9l& A  
#include "resource.h" // main symbols k 5t{  
class CHookApp : public CWinApp 'Z y{mq\  
{ +<z7ds{Z  
 public: fs7~NY  
  CHookApp(); pRb<wt7v  
  // Overrides x~%\y  
  // ClassWizard generated virtual function overrides u6f4yQ  
  //{{AFX_VIRTUAL(CHookApp) A_aO }oBX  
 public: =I7[L{+~Y  
  virtual BOOL InitInstance(); RZ<.\N (M  
  virtual int ExitInstance(); raSF3b/0  
  //}}AFX_VIRTUAL ,Io0ZE>`V  
  //{{AFX_MSG(CHookApp) ` 4OMZMq  
  // NOTE - the ClassWizard will add and remove member functions here. p0   
  // DO NOT EDIT what you see in these blocks of generated code ! V@Ax}<$A  
  //}}AFX_MSG KLON;  
  DECLARE_MESSAGE_MAP() Z`|>tbOfZ  
}; 2UQN*_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); FX cc1X/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O0-> sR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wQ@Zw bx  
BOOL InitHotkey(); &:-GI)[o  
BOOL UnInit(); C"(_mW{@  
#endif B5 D3_ iX]  
9#Z zE/  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <. ezw4ju  
#include "stdafx.h" r!CA2iK`  
#include "hook.h" $tEdBnf^ca  
#include <windowsx.h> F|9a}(-7  
#ifdef _DEBUG Ca$y819E2  
#define new DEBUG_NEW x-tm[x@;o  
#undef THIS_FILE u6]gQP">I  
static char THIS_FILE[] = __FILE__; { 576+:*  
#endif  PE^eP}O1  
#define MAX_KEY 100 9+W!k^VWq  
#define CTRLBIT 0x04 /@6E3lh S  
#define ALTBIT 0x02 P>>f{3e.  
#define SHIFTBIT 0x01 :vw0r`  
#pragma data_seg("shareddata") 1<;\6sg  
HHOOK hHook =NULL; c]S+70!n  
UINT nHookCount =0; U<K|jsFo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *Rz!i m|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT jQO* oq}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pHigxeV2  
static int KeyCount =0; u<$S>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \dC.%#  
#pragma data_seg() 9zmD6G!}t  
HINSTANCE hins; =`rppO  
void VerifyWindow(); <yis  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4 `j,&=  
//{{AFX_MSG_MAP(CHookApp) 6\%r6_.d  
// NOTE - the ClassWizard will add and remove mapping macros here. 4F}g(  
// DO NOT EDIT what you see in these blocks of generated code! -/@|2!d  
//}}AFX_MSG_MAP MX"A@p~H  
END_MESSAGE_MAP() cb\jrbj6  
^- u[q- !  
CHookApp::CHookApp() 0~Um^q*'3  
{ +oE7~64LL  
 // TODO: add construction code here, 5w]DncdQ~  
 // Place all significant initialization in InitInstance &19l k   
} L[`R8n1C  
SJso'6 g  
CHookApp theApp; )e @01l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z|V"8jE  
{ C3&17O6  
 BOOL bProcessed=FALSE; "bv,I-\  
 if(HC_ACTION==nCode) EI[e+@J  
 { xgZV0!%  
  if((lParam&0xc0000000)==0xc0000000){// Key up SH .9!lQv  
   switch(wParam) Gw{Gt]liq  
   { b #o}=m  
    case VK_MENU: =>gyc;{2K<  
     MaskBits&=~ALTBIT; }IxY(`:qs  
     break; Bl>_&A)  
    case VK_CONTROL: ho?|j"/7  
     MaskBits&=~CTRLBIT;  Oz"@yL}  
     break; e-L5=B  
    case VK_SHIFT: `V?x xq\  
     MaskBits&=~SHIFTBIT; XLkL#&Ir  
     break; x.jYip  
    default: //judge the key and send message K0d-MC   
     break; 9^6|ta0;0  
   } GN"M:L ^k`  
   for(int index=0;index<MAX_KEY;index++){ $)kk8Q4+K  
    if(hCallWnd[index]==NULL) jx^|2  
     continue; Q `J,dzY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L,s|gt v  
    { o=mq$Z:}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hNu>s  
     bProcessed=TRUE; T4%i`<i  
    } WZ-4^WM=!  
   } r[C3u[  
  } D#vn {^c8O  
  else if((lParam&0xc000ffff)==1){ //Key down S!`4Bl  
   switch(wParam) @d8&3@{R^  
   { :F!dTD$  
    case VK_MENU: EM>c%BH<N  
     MaskBits|=ALTBIT; eONeWY9  
     break; BN<#x@m$]  
    case VK_CONTROL: V0SW 5 m  
     MaskBits|=CTRLBIT; =)"NE>  
     break; pfJVE  
    case VK_SHIFT: Im0+`9Jw  
     MaskBits|=SHIFTBIT; a'*5PaXU@/  
     break; *IMF4 x5M  
    default: //judge the key and send message >oM9~7f  
     break; a"v"n$  
   } y]~+`9  
   for(int index=0;index<MAX_KEY;index++) |!jYv'%  
   { 7?n* t  
    if(hCallWnd[index]==NULL) (hRgYwUa<  
     continue; 89:?.'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #cSw"A  
    { e)ZyTuj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mip m&5R  
     bProcessed=TRUE; U5@TaGbx  
    } S*2L4Uj`|  
   } $ ufSNx(F  
  } 9H !B)  
  if(!bProcessed){ dw{#||  
   for(int index=0;index<MAX_KEY;index++){ d[P>jl%7  
    if(hCallWnd[index]==NULL) n)1  
     continue; IGF37';;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xVh\GU855  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Cn6n4, 0  
   } )<]w23i  
  } q>(I*=7  
 } 1?e>x91  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @'F8|I 6  
} Oo3qiw  
`a/PIc"  
BOOL InitHotkey() 1drqWI~  
{ WIH4Aw  
 if(hHook!=NULL){ fY,@2VxyfA  
  nHookCount++; OI]K_ m3  
  return TRUE; IgHs&=  
 } 61s2bt#  
 else &4[#_(pk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~Uwr68 9N  
  if(hHook!=NULL) rlUdAa3  
   nHookCount++; Up!ZCZ$RC  
  return (hHook!=NULL); <x>k3bD  
} 5m%baf2_  
BOOL UnInit() dc\u$'F@S  
{ Yt O@n@1  
 if(nHookCount>1){ 0T{c:m~QXe  
  nHookCount--; {'=Nb 5F  
  return TRUE; "t%1@b*u  
 } O0=,&=i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); z6L>!=  
 if(unhooked==TRUE){ %Zv(gI`A  
  nHookCount=0; I 1VEm?CQ  
  hHook=NULL; ?-.Ep0/  
 } {g:/ BFLr#  
 return unhooked; U~){$kpI#  
} l6}b{e  
o?Tp=Ge  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  Vgru, '  
{ _/z)&0DO  
 BOOL bAdded=FALSE; m|e*Jc  
 for(int index=0;index<MAX_KEY;index++){ D"( 3VIglq  
  if(hCallWnd[index]==0){ ;+TF3av0zq  
   hCallWnd[index]=hWnd; g.`t!6Hc  
   HotKey[index]=cKey; 1 ">d|oC  
   HotKeyMask[index]=cMask; i Ks,i9j  
   bAdded=TRUE; 3>@qQ_8%~  
   KeyCount++; _?(hWC"0  
   break; _1>(GK5[  
  } >m_ p\$_  
 } ;SlS!6.W-  
 return bAdded; jN'fm  
} VATXsD  
^b|Nw:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) abJ@>7V  
{ 3qxG?G N  
 BOOL bRemoved=FALSE; jFPE>F7-M  
 for(int index=0;index<MAX_KEY;index++){ }JpslY*aS  
  if(hCallWnd[index]==hWnd){ Edn$0D68u_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0P%|)Ae  
    hCallWnd[index]=NULL; + k(3+b$S-  
    HotKey[index]=0; ) R a/  
    HotKeyMask[index]=0; RwE*0 T  
    bRemoved=TRUE; Cf1wM:K|8  
    KeyCount--; YL&b9e4  
    break; 1UA~J|&gi^  
   }  /nD0hb  
  } M5ySs\O4  
 } Y4 ~wNs6  
 return bRemoved; !>kv.`|7~  
} Zh~Lm  
n.8A Ka6  
void VerifyWindow() g%q?2Nv  
{ +VpE-X=T  
 for(int i=0;i<MAX_KEY;i++){ d;jJe0pH  
  if(hCallWnd!=NULL){ Z\gg<Q  
   if(!IsWindow(hCallWnd)){ 9snyX7/!L  
    hCallWnd=NULL; '__3[D  
    HotKey=0; ZNH*[[Pf  
    HotKeyMask=0; RzY`^A6G6  
    KeyCount--; NV:XPw/  
   }  eS@!\H x  
  } '*LN)E> d  
 } hZ\W ?r  
} 9bcyPN  
E[Ws} n.  
BOOL CHookApp::InitInstance() fF-\TW  
{ #+ lq7HJ1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Sc"4%L  
 hins=AfxGetInstanceHandle(); vL=--#  
 InitHotkey(); D@b<}J>0'  
 return CWinApp::InitInstance(); T~~$=vP9  
} `Py= ?[cD  
3_eml\CY  
int CHookApp::ExitInstance() ?o(X0  
{ b\Xu1>  
 VerifyWindow(); +_XbHjhN/  
 UnInit(); *ZSp9g"Z  
 return CWinApp::ExitInstance(); u+tb83 ~[=  
} e'?d oP  
~ ew**@N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^(m6g&$(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Ccd7|L1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q}f}Jf3P  
#if _MSC_VER > 1000 N5an9r&z(1  
#pragma once n\ ',F  
#endif // _MSC_VER > 1000 .]ZuG  
lbuW*)  
class CCaptureDlg : public CDialog =UKR<@QrK  
{ .gkPG'm[  
 // Construction AoOG[to7  
 public: SnF[mN'  
  BOOL bTray; _Il9s#NA%  
  BOOL bRegistered; *I1W+W`G  
  BOOL RegisterHotkey(); 3w:Z4]J  
  UCHAR cKey; jUR #  
  UCHAR cMask; Z2j*%/  
  void DeleteIcon(); A"3&EuvU  
  void AddIcon(); \NQ)Po@z  
  UINT nCount; g Wv+i/,  
  void SaveBmp(); [QqNsco)  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q]g4gj  
  // Dialog Data GxDF7 z%&  
  //{{AFX_DATA(CCaptureDlg) ?nSp?m;  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6p6Tse]  
  CComboBox m_Key; P$qkb|D,  
  BOOL m_bControl; F)iG D~  
  BOOL m_bAlt;  nIDsCu=A  
  BOOL m_bShift; >/`c mNmb  
  CString m_Path; bq&S?! =s  
  CString m_Number; GuY5 % wr  
  //}}AFX_DATA <w2NJ ~M^  
  // ClassWizard generated virtual function overrides 6.7 Kp  
  //{{AFX_VIRTUAL(CCaptureDlg) |{LaZXU&  
 public: XM@i|AK M0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 898wZ{9  
 protected: 9-iB?a7{.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E!~2\qKT  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &b6@_C9  
  //}}AFX_VIRTUAL 42LXL*-4  
  // Implementation j.N\U#3KK  
 protected: 8*PAgPj a  
  HICON m_hIcon; hSKH#NS  
  // Generated message map functions Nu2]~W&  
  //{{AFX_MSG(CCaptureDlg) U9[A(  
  virtual BOOL OnInitDialog(); ec[[OIO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /\$|D&e  
  afx_msg void OnPaint(); KeHE\Fq^V  
  afx_msg HCURSOR OnQueryDragIcon(); KB *#t  
  virtual void OnCancel(); YB1DL ^ :  
  afx_msg void OnAbout(); _ * s  
  afx_msg void OnBrowse(); vG_v89t!ex  
  afx_msg void OnChange(); rJQ|Oi&1i  
 //}}AFX_MSG K/d &c]  
 DECLARE_MESSAGE_MAP() ^W[`##,{Od  
}; NE%yv,B  
#endif S!!\!w>N  
O8N0]Mz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h:;eh  
#include "stdafx.h" Z*aU2Kr`;  
#include "Capture.h" ` "":   
#include "CaptureDlg.h" ,zw=&)W1  
#include <windowsx.h> _v=WjN  
#pragma comment(lib,"hook.lib") |b~g^4  
#ifdef _DEBUG a&aIkD  
#define new DEBUG_NEW wvaIgy%z  
#undef THIS_FILE safS>wM]  
static char THIS_FILE[] = __FILE__; ?!j/wV_H  
#endif rZQHB[^3  
#define IDM_SHELL WM_USER+1 lbU+a$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y9y*" :&%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d*(Bs $De  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; i{[H3p8  
class CAboutDlg : public CDialog E/P53CD  
{ r_sl~^* :  
 public: 7^ {hn_%;  
  CAboutDlg(); u,SZ-2K!7~  
  // Dialog Data dB)hW'J?  
  //{{AFX_DATA(CAboutDlg) ;~$ $WU  
  enum { IDD = IDD_ABOUTBOX }; 7:q-NzE\6  
  //}}AFX_DATA Or) c*.|\  
  // ClassWizard generated virtual function overrides n]c,0N  
  //{{AFX_VIRTUAL(CAboutDlg) *xTquV$  
 protected: JU1; /3(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #&c;RPac!6  
  //}}AFX_VIRTUAL HFWm}vA:  
  // Implementation Ns8NaD  
 protected: WzbN=& C]h  
  //{{AFX_MSG(CAboutDlg) VD`2lGdF  
  //}}AFX_MSG p)&\>   
  DECLARE_MESSAGE_MAP() l"y9XO|  
}; [ \n.[4gq"  
`3P62M<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K5rj!*x.o  
{ \1'R}B@;  
 //{{AFX_DATA_INIT(CAboutDlg) I>~BkR+u%o  
 //}}AFX_DATA_INIT 7:E#c"S q  
} "hY^[@7 W  
[m[~A|S  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Dx*oSP.qX  
{ GJfNO-  
 CDialog::DoDataExchange(pDX); 'c(Y")QP  
 //{{AFX_DATA_MAP(CAboutDlg) jV&W[xKa  
 //}}AFX_DATA_MAP E?D{/ k,zZ  
} FGhrf  
0M2+?aKif  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Xtnmh)'K~#  
 //{{AFX_MSG_MAP(CAboutDlg) 'z!#E!i  
 // No message handlers f|1FqL+T]  
 //}}AFX_MSG_MAP <f{`}drp/  
END_MESSAGE_MAP() Cy'W!qH  
<%uZwk>#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &YP>" <  
: CDialog(CCaptureDlg::IDD, pParent) k\Tm?^L)  
{ `9{C/qB  
 //{{AFX_DATA_INIT(CCaptureDlg) sc>)X{eb  
  m_bControl = FALSE; u`,R0=<4  
  m_bAlt = FALSE; A_U0HVx_  
  m_bShift = FALSE; K :ptfD  
  m_Path = _T("c:\\"); N ] /d  
  m_Number = _T("0 picture captured."); 3"D00~  
  nCount=0; x+`3G.  
  bRegistered=FALSE; R:x04!}  
  bTray=FALSE; c}s3c >`d  
 //}}AFX_DATA_INIT m?G+#k;K  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O'U,|A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ys6"Q[B  
} cty#@?"e  
g]JI}O*5  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4<Y[L'UaA@  
{ c2:kZxT  
 CDialog::DoDataExchange(pDX); _tJURk%  
 //{{AFX_DATA_MAP(CCaptureDlg) qqre d>K  
  DDX_Control(pDX, IDC_KEY, m_Key); qZ1PC>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d0E5;3tQ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ED&KJnquWJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W\Y 4%y}  
  DDX_Text(pDX, IDC_PATH, m_Path); q`zR6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); PP|xIAc  
 //}}AFX_DATA_MAP $& gidz/w  
} w`f~Ht{wYR  
!&%bl  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o!0a8i  
//{{AFX_MSG_MAP(CCaptureDlg) NH6!|T  
 ON_WM_SYSCOMMAND() czi!q1<vg  
 ON_WM_PAINT() <)rH8]V  
 ON_WM_QUERYDRAGICON() !gQ(1u|r  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W7> _nK+g?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %'5wwl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ~,1X>N"  
//}}AFX_MSG_MAP <rxem(PPu  
END_MESSAGE_MAP() 1H@F>}DP  
$R36`wk  
BOOL CCaptureDlg::OnInitDialog() `o'sp9_3  
{ `&JA7UD>  
 CDialog::OnInitDialog(); Py<vN!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <-7Ha_#  
 ASSERT(IDM_ABOUTBOX < 0xF000); x9s`H)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 13 p0w  
 if (pSysMenu != NULL) ]2 N';(R  
 { K 2v)"|T)  
  CString strAboutMenu; {a%cU[q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); hUc |Xm  
  if (!strAboutMenu.IsEmpty()) ?"Q6;np*  
  { lph_cY3p  
   pSysMenu->AppendMenu(MF_SEPARATOR); P~>nlm82]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); EJY:C9W  
  } @Q5^Q'!  
 } 3E:<  
 SetIcon(m_hIcon, TRUE); // Set big icon EatDT*!  
 SetIcon(m_hIcon, FALSE); // Set small icon vUA`V\  
 m_Key.SetCurSel(0); ]z NL+]1_  
 RegisterHotkey(); xSZw,  
 CMenu* pMenu=GetSystemMenu(FALSE); t F( mD=[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yB[ LO( i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); '.yr8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ] "_'o~  
 return TRUE; // return TRUE unless you set the focus to a control |V]E8Qt  
} f}3bYF  
(avaTUMOqy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rR;Om1 -,  
{ FA,CBn5%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) " WL  
 { _bsfM;u.%  
  CAboutDlg dlgAbout; H8U*oLlc  
  dlgAbout.DoModal(); x$sQ .aT  
 } 6, ~aV  
 else gUQCKNw  
 { ?c*d z{  
  CDialog::OnSysCommand(nID, lParam); &2^V<(19  
 } Sj+#yct-  
} cFQa~  
*x!5I$~J  
void CCaptureDlg::OnPaint() I}x*AM 7+  
{ B$j,:^  
 if (IsIconic()) =r8(9:F!  
 { q ~lW  
  CPaintDC dc(this); // device context for painting <u\G&cd_tA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); A}# Mrb  
  // Center icon in client rectangle -B!pg7>'##  
  int cxIcon = GetSystemMetrics(SM_CXICON); rKxk?}  
  int cyIcon = GetSystemMetrics(SM_CYICON); ," v%  
  CRect rect; |n/id(R+  
  GetClientRect(&rect); 1??RX}8[L+  
  int x = (rect.Width() - cxIcon + 1) / 2; !b=$FOC>  
  int y = (rect.Height() - cyIcon + 1) / 2; ^&%?Q_]  
  // Draw the icon iV=#'yY  
  dc.DrawIcon(x, y, m_hIcon); L3\{{QOA  
 } "G:>}cs%?  
 else AS;{{^mM(  
 { ~XRr }z_Lq  
  CDialog::OnPaint(); suwj1qYJ4  
 } 7[\B{N9&W  
} `{":*V   
To+{9"$,  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8*ysuL#  
{ xPv&(XZR  
 return (HCURSOR) m_hIcon; nq;)!Wry  
} W` V  
w,7 GC5j\  
void CCaptureDlg::OnCancel() V{r@D!}  
{ A{vG@Pwc:  
 if(bTray) E}u\{uY  
  DeleteIcon(); B#}RMFIj  
  CDialog::OnCancel(); s zg1.&  
} rO~D{)Nu  
t30V_`eQ  
void CCaptureDlg::OnAbout() A(B2XBS!?  
{ as8<c4:v  
 CAboutDlg dlg; 7E'C o|  
 dlg.DoModal(); E {MSi"  
} \<%a`IA!*  
f&|SGD*  
void CCaptureDlg::OnBrowse() 5P4 >xv[  
{ Jor?;qo3  
 CString str; +}n]A^&I\E  
 BROWSEINFO bi; i F Ab"VA  
 char name[MAX_PATH]; 5`J. ic  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); h4C B1K  
 bi.hwndOwner=GetSafeHwnd(); aw`mB,5U  
 bi.pszDisplayName=name; M;OYh  
 bi.lpszTitle="Select folder"; Q1rwTg\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; .B@;ch,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0M"E6z)9  
 if(idl==NULL) IlVi1`]w  
  return; 6S(3tvUr  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %K%z<R8  
 str.ReleaseBuffer(); c-,/qn/  
 m_Path=str; LQe<mZ<  
 if(str.GetAt(str.GetLength()-1)!='\\') ]=/f`  
  m_Path+="\\"; _Z%C{~,7)x  
 UpdateData(FALSE); 8LL);"$  
} wR KGJ  
+W}f0@#)<  
void CCaptureDlg::SaveBmp() l\eq/yg_  
{ f%af.cR*  
 CDC dc; rRMC< .=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); vDemY"wz  
 CBitmap bm; S=o/n4@}  
 int Width=GetSystemMetrics(SM_CXSCREEN); E5rNC/Ul$$  
 int Height=GetSystemMetrics(SM_CYSCREEN); pD{Li\LY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1+]e?  
 CDC tdc; Vj_ $%0  
 tdc.CreateCompatibleDC(&dc); Uhf -}Jdw  
 CBitmap*pOld=tdc.SelectObject(&bm); c{[d@jt O  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); pq@ad\8  
 tdc.SelectObject(pOld); 5VI'hxU4Qg  
 BITMAP btm; +VJl#sc/;  
 bm.GetBitmap(&btm); qdOS=7]W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; W[YtNL;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); czj[U|eB}=  
 BITMAPINFOHEADER bih; S7V;sR"V2  
 bih.biBitCount=btm.bmBitsPixel; tY7u\Y;^  
 bih.biClrImportant=0; 49CMRO,T  
 bih.biClrUsed=0; sx9 N8T3n  
 bih.biCompression=0; jN[Z mJz'  
 bih.biHeight=btm.bmHeight; nQ mkDPjU  
 bih.biPlanes=1; kn! J`"b  
 bih.biSize=sizeof(BITMAPINFOHEADER); T+\BX$w/4e  
 bih.biSizeImage=size; PW}Yts7p  
 bih.biWidth=btm.bmWidth; d;>:<{z@CD  
 bih.biXPelsPerMeter=0; #2pgh?  
 bih.biYPelsPerMeter=0; sbRg=k&Ns  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); = zsXa=<  
 static int filecount=0; :Qf^@TS}O  
 CString name; 6D$xG"c  
 name.Format("pict%04d.bmp",filecount++); P~~RK& +i  
 name=m_Path+name; |(wx6H:  
 BITMAPFILEHEADER bfh; "k+QDQ3=  
 bfh.bfReserved1=bfh.bfReserved2=0; P)T:6K  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Dv$xP)./  
 bfh.bfSize=54+size; .EI/0"^  
 bfh.bfOffBits=54; J%nJO3,  
 CFile bf; CxO) d7c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X%;,r 2g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;m\E9ple  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3M^ /   
  bf.WriteHuge(lpData,size); <4Ak$ E %"  
  bf.Close(); !a0HF p$9  
  nCount++; U_w)*)F  
 } ':HV9]k  
 GlobalFreePtr(lpData); nkpQM$FW  
 if(nCount==1) $XJe)  
  m_Number.Format("%d picture captured.",nCount); |/q*Fg[f  
 else L)Kn8  
  m_Number.Format("%d pictures captured.",nCount); a+MC[aFr  
  UpdateData(FALSE); TiH(HW|:  
} $u>^A<TBN  
LG;xZQx'  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p{.EFa>H  
{ ?g9CeeH*  
 if(pMsg -> message == WM_KEYDOWN) [}FP_Su$6  
 { rt"\\sOlMB  
  if(pMsg -> wParam == VK_ESCAPE) ,O2Uj3"  
   return TRUE; K\ZKVn  
  if(pMsg -> wParam == VK_RETURN) 'Y[\[]3[8  
   return TRUE; -2f0CAh~  
 } m0 `wmM  
 return CDialog::PreTranslateMessage(pMsg); %F03cI,  
} /H\ZCIu/7  
$?0<rvGJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z2-=fIr.h  
{ KBXdr52"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  Wkf)4!  
  SaveBmp(); Xc'yz 2B  
  return FALSE; SMnbI .0  
} O9!<L.X,%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]Dx5t&  
 CMenu pop; w^dB1Y7c(W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); x *(pr5k  
 CMenu*pMenu=pop.GetSubMenu(0); z]tvy).  
 pMenu->SetDefaultItem(ID_EXITICON); K2NnA  
 CPoint pt; IUwY/R9Q  
 GetCursorPos(&pt); 7n %QP  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~aBALD0D;  
 if(id==ID_EXITICON) S0\:1B  
  DeleteIcon(); R D)dw  
 else if(id==ID_EXIT) GK:*|jV  
  OnCancel(); &bTadd%0  
 return FALSE; yBeSvsm  
} V<+d o|@F  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ([s2F%S`@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >&p_G0-  
 AddIcon(); #t9&X8:U  
 return res; qxk1Rzm?x  
} $vicxE~-E  
O(CUwk  
void CCaptureDlg::AddIcon() 1#XMUbFc  
{ VYvHpsI  
 NOTIFYICONDATA data; *S*;rLH9c  
 data.cbSize=sizeof(NOTIFYICONDATA); I/fERnHM/+  
 CString tip; h}.0Ne  
 tip.LoadString(IDS_ICONTIP); g(|p/%H  
 data.hIcon=GetIcon(0); cLX~NPD/  
 data.hWnd=GetSafeHwnd(); C#;}U51:t  
 strcpy(data.szTip,tip); S__+S7]Nr  
 data.uCallbackMessage=IDM_SHELL; ^-rb&kW@:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <.~j:GbsE  
 data.uID=98; %WdAI,  
 Shell_NotifyIcon(NIM_ADD,&data); vfmKYiLp  
 ShowWindow(SW_HIDE); E+csK*A7  
 bTray=TRUE; . [*6W.X  
} ASPfzW2  
pZF`+6 42  
void CCaptureDlg::DeleteIcon() lZ'NL bK  
{ km.xy_v  
 NOTIFYICONDATA data; v"\Q/5p  
 data.cbSize=sizeof(NOTIFYICONDATA); o)srE5  
 data.hWnd=GetSafeHwnd(); k'EP->r  
 data.uID=98; Z-Zox-I1}-  
 Shell_NotifyIcon(NIM_DELETE,&data); ,253'53W)  
 ShowWindow(SW_SHOW); JoIffI?{(D  
 SetForegroundWindow(); k(!#^Mlz[  
 ShowWindow(SW_SHOWNORMAL); kC6J@t)  
 bTray=FALSE; BPtU]Bv-  
} Ig*!0(v5$  
enE8T3   
void CCaptureDlg::OnChange() /id(atiF^  
{ 6imDA]5N&  
 RegisterHotkey(); bv-s}UP0  
} ps^Z)x`GV  
sYgpK92  
BOOL CCaptureDlg::RegisterHotkey() D<C ZhYJ  
{ /mF%uI>:  
 UpdateData(); <LH(>  
 UCHAR mask=0; !/sXG\  
 UCHAR key=0; g/J ^ YT!  
 if(m_bControl) Q(>89*b&  
  mask|=4; XF'K dz>p  
 if(m_bAlt) BPwFcT)i!(  
  mask|=2; 6xvyhg#B  
 if(m_bShift) Em %"] B  
  mask|=1; ;y Wfb|!  
  key=Key_Table[m_Key.GetCurSel()]; ){ArZjG>  
 if(bRegistered){ [$ vAjP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ESL(Mf'  
  bRegistered=FALSE; V1,O7m+F2  
 } [C.Pzo  
 cMask=mask; ;WWUxrWif  
 cKey=key; VYMs`d[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c"H*9u:  
 return bRegistered; gfR B  
} WfL5. &  
u#ag|b/C:  
  四、小结 d*4fl.  
T\NvN&h-  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八