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
  • 7785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: 9*a=iL*Nw  
  `hb%+-lj+  
  一、实现方法 '} $Dgp6e  
N$[{8yil^w  
  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: \<g*8?yFs  
p}cw{  
#pragma data_seg("shareddata") y '!m4-  
HHOOK hHook =NULL; //钩子句柄 .?l\g-;=  
UINT nHookCount =0; //挂接的程序数目 :>=\.\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Q1+dCCY#F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 v;)..X30  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @9"J|}  
static int KeyCount =0; y:6; LZ9[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 f!JS= N?3  
#pragma data_seg() Qubp9C#r  
^#sU*trr  
  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。 >vA2A1WhW  
Jkek-m  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: gg8Uo G  
Y0X-Zqk'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR z[;z>8|c  
cKey,UCHAR cMask) k5T,990  
{ R2 V4#  
 BOOL bAdded=FALSE; Bi{$@n&?f  
 for(int index=0;index<MAX_KEY;index++){ (P$H<FtH  
  if(hCallWnd[index]==0){ CvD "sHVq%  
   hCallWnd[index]=hWnd; &#iTQD  
   HotKey[index]=cKey; B $mX3B+a  
   HotKeyMask[index]=cMask; eow'K 821A  
   bAdded=TRUE; )vSRHE  
   KeyCount++; LEtG|3Dx  
   break; k`N^Vdr  
  } 5s]. @C8  
 } >:b Q  
 return bAdded; @/31IOIV]`  
} OE-gC2&Bm  
//删除热键 ~Rr~1I&mR,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3p'I5,}  
{ Cid ;z  
 BOOL bRemoved=FALSE; gdQvp=v]  
 for(int index=0;index<MAX_KEY;index++){ zOiu5  
  if(hCallWnd[index]==hWnd){ :*KHx|Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L'kmNVvYN  
    hCallWnd[index]=NULL; P ! _rEV  
    HotKey[index]=0; ;&)-;l7M  
    HotKeyMask[index]=0; q?8| [.  
    bRemoved=TRUE; 8#g1P4  
    KeyCount--; 0ik7v<:  
    break; 9_5ow  
   } |/)${*a4n  
  } :n-]>Q>5=k  
 } ;4pYK@9w_  
 return bRemoved; q0zr E5  
} sjV!5Z  
n~V ]Z  
uu>Pkfo  
  DLL中的钩子函数如下: @8I4[TE  
:Cj OPl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (R("H/6xs  
{ v p/yG   
 BOOL bProcessed=FALSE; U3dwI:cG  
 if(HC_ACTION==nCode) K>@+m  
 { Ptdpj)oi&Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 e(<st r>  
   switch(wParam) [wzb<"kW  
   {  N <Xq]! K-  
    case VK_MENU: z.;ez}6%V  
     MaskBits&=~ALTBIT; 71t* %  
     break; ]&Rx@&e*  
    case VK_CONTROL: u@cYw:-C  
     MaskBits&=~CTRLBIT; =D<PVGo9  
     break; Rw0qcM\>|  
    case VK_SHIFT: |3KLk?2  
     MaskBits&=~SHIFTBIT; XMu9Uk{|  
     break; ?m\t| /0Q  
    default: //judge the key and send message aq@8"b(.  
     break; #$8% w  
   } ", KCCis  
   for(int index=0;index<MAX_KEY;index++){ $cU!m(SILQ  
    if(hCallWnd[index]==NULL) i=oU;7~zK  
     continue; 5l UF7:A>#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .0`m\~L  
    { !'9Feoez  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9~/J35  
     bProcessed=TRUE; v : OR   
    } o9dY9o+Z  
   } '$ t  
  } I!Z_ [M  
  else if((lParam&0xc000ffff)==1){ //有键按下 lrIjJ V  
   switch(wParam) EZ`te0[  
   { Zm_UR*"  
    case VK_MENU: 8&qZ0GLaT  
     MaskBits|=ALTBIT; i\rDu^VQ  
     break; e9U9Uu[  
    case VK_CONTROL: ?Yth0O6?sb  
     MaskBits|=CTRLBIT; Ku} Z  
     break; ^<a t'jk6  
    case VK_SHIFT: gL *>[@RO  
     MaskBits|=SHIFTBIT; FWG6uKv  
     break; 3@$,s~+ 3  
    default: //judge the key and send message .ufTQ?Fe  
     break; (jRm[7H  
   } ?En O"T.  
   for(int index=0;index<MAX_KEY;index++){ :fZ}o|t7  
    if(hCallWnd[index]==NULL) QLiu2U o  
     continue; 8y.wSu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7>))D'l57  
    { b)qoh^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ki$MpA3j   
     bProcessed=TRUE; &-Gqdnc  
    } Pama#6?OPh  
   } SBfT20z[  
  } yDegcAn?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Kzm+GW3o[  
   for(int index=0;index<MAX_KEY;index++){ -~v2BN/  
    if(hCallWnd[index]==NULL) R\G0'?h >  
     continue; bU2Z[sn.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YA_c N5p/@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IID-k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 v,-HU&/*B  
   } RL@VSHXc  
  } d\|?-hY`[  
 } JP!~,mdS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R6kD=JY/!  
} r")`Ph@yp  
"!ug_'VW  
  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: ( u\._Gwsx  
%In A+5s`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c4^ks&)'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |@ s,XS  
C.Kh [V\Ut  
  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: i]YV {  
%,}A@H ,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -w}]fb2Q>  
{ C'.L20qW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) z"-u95H  
 { * K D I}B>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Oj3.q#)`Z  
  SaveBmp(); ~=6xyc/c  
  return FALSE; +eK"-u~K  
 } fzb29 -  
 …… //其它处理及默认处理 jET{Le8i  
} hIs4@0  
~962i#&4  
ao1(]64X"  
  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。 `1$@|FgyC  
"55skmD.P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 RI 5yF  
=[cS0Sy  
  二、编程步骤 (|:M&Cna]  
7Bzq,2s  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; pfA|I*`XV  
v &Yi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ai=s e2  
N kb|Fd/s  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; G'Q-An%z  
fTS5 yb%  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; JQ8fdP A  
r@h5w_9  
  5、 添加代码,编译运行程序。 q<[P6}.  
xW)2<m6C&  
三、程序代码 ;qafT@ }C  
.h@rLorm>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4B =7:r  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nm5cpnNl  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~dgDO:)  
#if _MSC_VER > 1000 ?I_s0k I  
#pragma once %GjM(;Tk  
#endif // _MSC_VER > 1000 V:In>u$QJ!  
#ifndef __AFXWIN_H__ ); !eow  
#error include 'stdafx.h' before including this file for PCH W=^#v  
#endif n$x c];j  
#include "resource.h" // main symbols vM*-D{  
class CHookApp : public CWinApp y~ AVei&  
{ VRWAm>u  
 public: fHE <(  
  CHookApp(); S!jTyY7e  
  // Overrides `5cKA;j>b  
  // ClassWizard generated virtual function overrides [,t*Pfq'W8  
  //{{AFX_VIRTUAL(CHookApp) xu/cq9  
 public: 1an^1!  
  virtual BOOL InitInstance(); R&8Iz yM  
  virtual int ExitInstance(); H[s(e5 6z  
  //}}AFX_VIRTUAL 8ndYV>{f  
  //{{AFX_MSG(CHookApp) 7 E r23Q  
  // NOTE - the ClassWizard will add and remove member functions here. V+* P2|  
  // DO NOT EDIT what you see in these blocks of generated code ! YSr9VpqWV  
  //}}AFX_MSG ]fx"4qKM  
  DECLARE_MESSAGE_MAP() T*8VDY7  
}; [YRz*5   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #|Y5,a ,{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ][gq#Vx@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3GaQk-  
BOOL InitHotkey(); 2Nu=/tMN  
BOOL UnInit(); "Gfh,e  
#endif 6}gls}[0{e  
1L%CJ+Q#0i  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ocqU=^ta  
#include "stdafx.h" g`{;(/M+  
#include "hook.h" wKtl+}}  
#include <windowsx.h> kw >v:F<M  
#ifdef _DEBUG W]"zctE  
#define new DEBUG_NEW rHC>z7+z.  
#undef THIS_FILE )M,Of Xa  
static char THIS_FILE[] = __FILE__; c(3~0Yr  
#endif ]e"=$2d$  
#define MAX_KEY 100 9Tg IB  
#define CTRLBIT 0x04 'DY`jVwa  
#define ALTBIT 0x02 (Mo*^pVr  
#define SHIFTBIT 0x01 K SbKEA  
#pragma data_seg("shareddata") y6ECdVF  
HHOOK hHook =NULL; PlU*X8  
UINT nHookCount =0; IpINH3odT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B-?6M6#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT yCd-9zb=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *rM^;4Zt  
static int KeyCount =0; <;9 I@VYK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0IwA#[m1`  
#pragma data_seg() :#LLo}LKp  
HINSTANCE hins; 2KB\1&N  
void VerifyWindow(); !*s?B L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) iqC|G/  
//{{AFX_MSG_MAP(CHookApp) RY]#<9>M  
// NOTE - the ClassWizard will add and remove mapping macros here. `> 7; !  
// DO NOT EDIT what you see in these blocks of generated code! chcbd y>C  
//}}AFX_MSG_MAP 14Xqn8uOW  
END_MESSAGE_MAP() 6_J$UBT  
^Ew]uN>,  
CHookApp::CHookApp() 8UXjm_B^'  
{ oiF}?:7Q7  
 // TODO: add construction code here, ^ssK   
 // Place all significant initialization in InitInstance lW+\j3?Z$  
} ;+e}aER&9  
O!m vJD  
CHookApp theApp; 5QW=&zI`=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8>trS=;n  
{ (n*^4@"2  
 BOOL bProcessed=FALSE; #^`4DhQ/ 1  
 if(HC_ACTION==nCode) $Z!`Hb  
 { ~qcNEl\-y  
  if((lParam&0xc0000000)==0xc0000000){// Key up .R) D3NZp  
   switch(wParam) j|4<i9^}  
   { D8inB+/-  
    case VK_MENU: KX76UW   
     MaskBits&=~ALTBIT; T m_bz&Q  
     break; yWg@v +  
    case VK_CONTROL: T_s _p  
     MaskBits&=~CTRLBIT; 1{r3#MVL  
     break; -(~.6WnhS  
    case VK_SHIFT: [="e ziM{  
     MaskBits&=~SHIFTBIT;  ~3Lg"I  
     break; Lrta/SU*  
    default: //judge the key and send message .\[`B.Q  
     break; xAqb\|$^  
   } YNLV9.P6  
   for(int index=0;index<MAX_KEY;index++){ K0H'4' I  
    if(hCallWnd[index]==NULL) NE"@Bk cm  
     continue; I3=%h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xO$lsZPG  
    { $:cE ^8K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  tR}MrM  
     bProcessed=TRUE; I~q#eO)  
    } ~8~aJ^[  
   } c2h{6;bfY  
  } fRrvNj0{ V  
  else if((lParam&0xc000ffff)==1){ //Key down w:%o?pKet1  
   switch(wParam) )2pbpbWX>  
   { ~rlB'8j(  
    case VK_MENU: XF Patd  
     MaskBits|=ALTBIT; UM!ENI|  
     break; VbJiZw(aR  
    case VK_CONTROL: ~o82uw?  
     MaskBits|=CTRLBIT; ~c8? >oN(  
     break; !Nu<xq@!  
    case VK_SHIFT: ?p9VO.^5  
     MaskBits|=SHIFTBIT; {!.(7wV\  
     break; VO,!x~S!  
    default: //judge the key and send message 2>|dF~"  
     break; L; T8?+x  
   } g$7{-OpB  
   for(int index=0;index<MAX_KEY;index++)  !;EjB*&  
   { Fgkajig  
    if(hCallWnd[index]==NULL) , `wXg  
     continue; us ;YV<)d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y)F;zW<+  
    { _wC3kAO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <A<{,:5C  
     bProcessed=TRUE; (hTCK8HK  
    } x4g3 rmp  
   } NS9B[*"Jl  
  }  :l~ I  
  if(!bProcessed){ <:(6EKJAq}  
   for(int index=0;index<MAX_KEY;index++){ ;KOLNi-B&  
    if(hCallWnd[index]==NULL) RSr %n1  
     continue; I[=j&rK`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @|Fg,N<Y]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )!Jc3%(B  
   } 3,>0a  
  } pwO>h>ik  
 } CEXyrs<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /|r^W\DV&x  
} =7-9[{  
TK5K_V*7  
BOOL InitHotkey() j;%-fvd;  
{ oE<`VY|  
 if(hHook!=NULL){ I'\kFjc  
  nHookCount++; QZ4v/Ou  
  return TRUE; x1Lb*3Fe  
 } +~'865{  
 else ICuF %  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4A@NxihH  
  if(hHook!=NULL) 3j,Q`+l/6d  
   nHookCount++; #OBJzf*p  
  return (hHook!=NULL); 6S\C}U/   
} >C7r:%  
BOOL UnInit() E>&n.%  
{ %dJX-sm@  
 if(nHookCount>1){ P6E3-?4j  
  nHookCount--; bIGHGd  
  return TRUE; 4Yxo~ m(  
 } ML:Q5 ^`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x HoKo  
 if(unhooked==TRUE){ W [Of|?  
  nHookCount=0; 1lq(PGX)  
  hHook=NULL; %F\?R[^5  
 } Acnl^x7Y1  
 return unhooked; e .]KL('  
}  i7]4W  
GRGzP&}@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^sa#8^,K  
{ jL(qf~c_  
 BOOL bAdded=FALSE; =3|O %\  
 for(int index=0;index<MAX_KEY;index++){ c05TsMF&O  
  if(hCallWnd[index]==0){ 7Ok;Lt!x  
   hCallWnd[index]=hWnd; 2}YOcnB  
   HotKey[index]=cKey; aJYgzr,  
   HotKeyMask[index]=cMask; z)'Mk[  
   bAdded=TRUE; n_$ :7J  
   KeyCount++; I3 .x9  
   break; KQacoUHrK?  
  } X'%E\/~u  
 } M9EfU  
 return bAdded; Lk~ho?^`  
} OTC!wI g  
K|Ld,bq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k spTp>~  
{ ^m?KRm2  
 BOOL bRemoved=FALSE; P9=?zh 6G.  
 for(int index=0;index<MAX_KEY;index++){ W)9K`hM6  
  if(hCallWnd[index]==hWnd){ d_4T}% q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ne#WI'  
    hCallWnd[index]=NULL; +lJG(Qd  
    HotKey[index]=0; p+l!6  
    HotKeyMask[index]=0; EPS={w$'s  
    bRemoved=TRUE; ~vs}.kb  
    KeyCount--; QF{4/y^j{  
    break; %{YN70/  
   } -M%_\;"de  
  } [`p=(/I&L  
 } MxWy*|J}  
 return bRemoved; bSsh^Z  
} *\=.<|HZ  
~GTz:nC*  
void VerifyWindow() u@~JiiC%  
{ 4$qWiG~  
 for(int i=0;i<MAX_KEY;i++){ jZh';M8"  
  if(hCallWnd!=NULL){ ;FBUwR}  
   if(!IsWindow(hCallWnd)){ 0|2%vh>J  
    hCallWnd=NULL; $wmvKQc{lx  
    HotKey=0; uIcn{RZ_z  
    HotKeyMask=0; A'G66ei  
    KeyCount--; " Om[~-31  
   } ktj]:rCkF  
  } 2rmSo&3@s  
 } Yiry["[]Q  
} T _sTC)&a  
:/:.Kb  
BOOL CHookApp::InitInstance() 8aO~/i:(.  
{ s_x:T<]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @7n/Q(  
 hins=AfxGetInstanceHandle(); @kk4]:,w  
 InitHotkey();  -QOw8vm  
 return CWinApp::InitInstance(); {LX.iH9}l  
}  Mu2  
Sl-v W  
int CHookApp::ExitInstance() 4Fp0ZVT  
{ z74in8]  
 VerifyWindow(); ~vXaqCX  
 UnInit(); 4D[ '^q  
 return CWinApp::ExitInstance(); =Vy`J)z9  
} &8%e\W\K:/  
<,3^|$c%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Swp;HW7x  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~.A)bp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &krwf ]|  
#if _MSC_VER > 1000 0@G")L Ue0  
#pragma once b7!Qn}  
#endif // _MSC_VER > 1000 rA2 g&  
6b%WHLUeT  
class CCaptureDlg : public CDialog ^xh}I5  
{ .mDM[e@'  
 // Construction t]$P1*I  
 public: Eq$&qV-?(  
  BOOL bTray; w4W_iaU  
  BOOL bRegistered; v z^<YZMu  
  BOOL RegisterHotkey(); q-]`CW]n  
  UCHAR cKey; *H?!;u=8  
  UCHAR cMask; ,Y|^^?'j Q  
  void DeleteIcon(); bx]N>k J  
  void AddIcon(); IX*idcxR  
  UINT nCount; XK|R8rhg8`  
  void SaveBmp(); si&S%4(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f 1w~!O9  
  // Dialog Data  emK$`9  
  //{{AFX_DATA(CCaptureDlg) Kl2lbe7  
  enum { IDD = IDD_CAPTURE_DIALOG }; 356>QW'm  
  CComboBox m_Key; Cl ^\OZN\=  
  BOOL m_bControl; 0{dz5gUde  
  BOOL m_bAlt; Lb;zBmwB  
  BOOL m_bShift; N@O8\oQG  
  CString m_Path; p"l3e9&'j  
  CString m_Number; 3l3+A+ n  
  //}}AFX_DATA YyTSyP4  
  // ClassWizard generated virtual function overrides e =4+$d  
  //{{AFX_VIRTUAL(CCaptureDlg) oI}kH=<,  
 public: DA2}{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); UilMv~0  
 protected: R,9[hNHWGs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Row)hx8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S+'rG+NJ  
  //}}AFX_VIRTUAL L]d-hs  
  // Implementation ]Ar\c["  
 protected: r*$Ner  
  HICON m_hIcon; n) k1  
  // Generated message map functions ({JHZ6uZ  
  //{{AFX_MSG(CCaptureDlg) TjQvAkT  
  virtual BOOL OnInitDialog(); ,WJH}(h"D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vC1v"L;[o/  
  afx_msg void OnPaint(); qduWzxB  
  afx_msg HCURSOR OnQueryDragIcon(); nBHnkbKoy  
  virtual void OnCancel(); UW9?p}F  
  afx_msg void OnAbout(); 5aln>1x>hn  
  afx_msg void OnBrowse(); F)+{AQL  
  afx_msg void OnChange(); Pu"R,a  
 //}}AFX_MSG EhO|~A*R  
 DECLARE_MESSAGE_MAP() E<C&Cjz:H  
}; U Z|HJ8_  
#endif dbOdq  
FXzFHU/dP  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'ihhoW8  
#include "stdafx.h" Qu} W/j|3  
#include "Capture.h" 1Wm)rXW[x  
#include "CaptureDlg.h" *+uHQgn(  
#include <windowsx.h> 3&6#F"7  
#pragma comment(lib,"hook.lib") M/):e$S  
#ifdef _DEBUG ?0YCpn  
#define new DEBUG_NEW x.3J[=z=>  
#undef THIS_FILE lu#LCG-.  
static char THIS_FILE[] = __FILE__; ={5#fgK>  
#endif \0mb 3Q'  
#define IDM_SHELL WM_USER+1 ~(pmLZ<GW}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lY{FSGp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G7)Fk%>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3,]gEE3  
class CAboutDlg : public CDialog RjWqGr;bO  
{ -i4&v7"  
 public: =egW  
  CAboutDlg(); 8}fu,$$5  
  // Dialog Data 05snuNt]-  
  //{{AFX_DATA(CAboutDlg) iJZ/jCI  
  enum { IDD = IDD_ABOUTBOX }; ukvtQz)  
  //}}AFX_DATA /}Lt,9  
  // ClassWizard generated virtual function overrides UK1_0tp]x  
  //{{AFX_VIRTUAL(CAboutDlg) /DqLrA  
 protected: 4#5:~M }  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w.lAQ5)I%\  
  //}}AFX_VIRTUAL =xNv\e  
  // Implementation /Nr*`l  
 protected: hgLj<  
  //{{AFX_MSG(CAboutDlg) %e`$p=m  
  //}}AFX_MSG 5Q 'i2*j  
  DECLARE_MESSAGE_MAP() zfwS  
}; &BtK($  
@#P,d5^G  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) vjQb%/LWl  
{ ?Q-h n:F)  
 //{{AFX_DATA_INIT(CAboutDlg) Hew d4k  
 //}}AFX_DATA_INIT RPIyO  
} ,SQZD,3v4  
_>=L>*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f{"8g"[[)(  
{ 'Fs)Rx}\0  
 CDialog::DoDataExchange(pDX); KAsS [  
 //{{AFX_DATA_MAP(CAboutDlg) *1 G>YH  
 //}}AFX_DATA_MAP p_UlK8rb  
} uA$<\fnz  
m85WA # `  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?x+Z)`w_  
 //{{AFX_MSG_MAP(CAboutDlg) O/.Uh`T`6  
 // No message handlers 6m VuyI  
 //}}AFX_MSG_MAP t ^[8RhD  
END_MESSAGE_MAP() xB@|LtdO9;  
{ .*y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) uP<0WCN  
: CDialog(CCaptureDlg::IDD, pParent) =56T{N  
{ pSm $FBW h  
 //{{AFX_DATA_INIT(CCaptureDlg) % , N<  
  m_bControl = FALSE; 0<8XI>.3D  
  m_bAlt = FALSE; UjOB98Du  
  m_bShift = FALSE; }?&k a$rI  
  m_Path = _T("c:\\"); e#,~,W.H  
  m_Number = _T("0 picture captured."); ]$p{I)d&  
  nCount=0; P7 PB t  
  bRegistered=FALSE; OiAJ[L  
  bTray=FALSE; =1P6Vk  
 //}}AFX_DATA_INIT ?KITC;\\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4*aZ>R2hO  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4J?t_)  
} Y3h/~bM%  
]c&<zeX,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4GR!y)  
{ ,jC3Fcly  
 CDialog::DoDataExchange(pDX); !r`,=jK"  
 //{{AFX_DATA_MAP(CCaptureDlg) 1Nu1BLPm  
  DDX_Control(pDX, IDC_KEY, m_Key); uZZU{U9h  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7},)]da>,'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); w=|GJ 0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); YPzU-:3  
  DDX_Text(pDX, IDC_PATH, m_Path); >XOiu#kC  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l~D N1z6`  
 //}}AFX_DATA_MAP >6oOZbUY0  
} |A%<Z(  
:QWq"cBem  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  J*l4|^i<  
//{{AFX_MSG_MAP(CCaptureDlg) oQv3GpO  
 ON_WM_SYSCOMMAND() Ne $"g[uFU  
 ON_WM_PAINT() ?=VOD#)  
 ON_WM_QUERYDRAGICON() p~.8\bI=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hoT/KWD,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .))v0   
 ON_BN_CLICKED(ID_CHANGE, OnChange) +525{Tj  
//}}AFX_MSG_MAP @Kf_z5tm:  
END_MESSAGE_MAP() hLDA]s  
Z4){ 7|~a  
BOOL CCaptureDlg::OnInitDialog() t8+_/BXv  
{ k<RZKwQc  
 CDialog::OnInitDialog(); H'MJ{r0,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); QI]Ih  
 ASSERT(IDM_ABOUTBOX < 0xF000); Sa"9^_.2#  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Dfd-^N!  
 if (pSysMenu != NULL) SlSM+F  
 { k|BHnj  
  CString strAboutMenu; vA)O {W\o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); q~L^au8  
  if (!strAboutMenu.IsEmpty()) w_ {,<[#  
  { ~Ph\Sbp  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0aoHKeP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v+e|o:o#  
  } l;sy0S"DO]  
 } Bm\qxQ  
 SetIcon(m_hIcon, TRUE); // Set big icon _5MNMV LwW  
 SetIcon(m_hIcon, FALSE); // Set small icon \v6 M:KR5/  
 m_Key.SetCurSel(0); l%Gw_0.?e  
 RegisterHotkey(); AF43$6KZP$  
 CMenu* pMenu=GetSystemMenu(FALSE); ubu?S%`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &TG5rUUg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7O`o ovW$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uY< H#k  
 return TRUE; // return TRUE unless you set the focus to a control |3+m%;X  
} 83cW=?UgA  
.D4bqL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) w[_x(Ojq;  
{ =SD\Q!fA  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) \<vNVz7.D  
 { fbFX4?-  
  CAboutDlg dlgAbout; hI pKJ&hm  
  dlgAbout.DoModal(); F?m?UQS'u  
 } zq1mmFIO  
 else hh~n#7w~IR  
 { FuX 8v  
  CDialog::OnSysCommand(nID, lParam); dY" }\v6  
 } $|KaBx1  
} ;NV'W]  
L:M0pk{T  
void CCaptureDlg::OnPaint()  q{die[J  
{ )' xETA  
 if (IsIconic()) ?3Ij*}_O2  
 { #Fu>|2F|  
  CPaintDC dc(this); // device context for painting .+y>8h3{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $KjTa#[RX7  
  // Center icon in client rectangle kCUT ^  
  int cxIcon = GetSystemMetrics(SM_CXICON); w6 2=06`@  
  int cyIcon = GetSystemMetrics(SM_CYICON); Q,Z*8FH=  
  CRect rect; `(0LK%w  
  GetClientRect(&rect); bXYA5wG  
  int x = (rect.Width() - cxIcon + 1) / 2; h{ lDxOH*  
  int y = (rect.Height() - cyIcon + 1) / 2; 44\>gI<  
  // Draw the icon AGYm';z3  
  dc.DrawIcon(x, y, m_hIcon); `>D9P_Y"jI  
 } P6Bl *@G  
 else 6zIgQ4Bp24  
 { *m+5Pr`7  
  CDialog::OnPaint(); U-0#0}_  
 } HNa]H;-+5  
} NYABmI/0c  
Ip}Vb6}  
HCURSOR CCaptureDlg::OnQueryDragIcon() rVQX7l#YI  
{ rOD1_X-  
 return (HCURSOR) m_hIcon; _SZ5P>GIU  
} -~)OF  
+Ra3bjl  
void CCaptureDlg::OnCancel() L;W.pe0  
{ ql5x2n  
 if(bTray) OMihXt[  
  DeleteIcon(); Uz%Z&K  
  CDialog::OnCancel(); `-B+JQmen  
} :f'&z47  
3Dm8[o$Z  
void CCaptureDlg::OnAbout() }8'&r(cN4  
{ |0bc$ZY:  
 CAboutDlg dlg; 2aw&F Z?  
 dlg.DoModal(); 2 Tvvq(?T  
} ZF#Rej?  
o%M<-l"!/  
void CCaptureDlg::OnBrowse() Bk|K%K  
{ Nq8@Nyp  
 CString str; >s*DrfX6  
 BROWSEINFO bi; iO!6}yJ*V  
 char name[MAX_PATH]; <64HveJ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tPuut\ee  
 bi.hwndOwner=GetSafeHwnd(); }0=<6\+:`  
 bi.pszDisplayName=name; lm'Zy"~::  
 bi.lpszTitle="Select folder"; z&nZ<ih  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7N2\8kP  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q"J-tP!  
 if(idl==NULL) :ipoD%@  
  return; m4ApHM2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -E&e1u,Mi  
 str.ReleaseBuffer(); ul5|.C  
 m_Path=str; !)NidG  
 if(str.GetAt(str.GetLength()-1)!='\\') ]Ql 0v"` F  
  m_Path+="\\"; OCyG_DLT$5  
 UpdateData(FALSE); !UV5zmS  
} N:+ taz-  
fW0$s`  
void CCaptureDlg::SaveBmp() /k:$l9C[  
{ 83 ]PA<R  
 CDC dc; 'bW5Fr>W  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]]iO- }  
 CBitmap bm; v:ER 4  
 int Width=GetSystemMetrics(SM_CXSCREEN); _; ]e@  
 int Height=GetSystemMetrics(SM_CYSCREEN); >cOei K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0x)dnq\  
 CDC tdc;  v%{0 Tyk  
 tdc.CreateCompatibleDC(&dc); WXUkuO  
 CBitmap*pOld=tdc.SelectObject(&bm); +p:Y=>bTj  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eE:&qy^  
 tdc.SelectObject(pOld); G`]w?Di4  
 BITMAP btm; aSaAC7sFk  
 bm.GetBitmap(&btm); u@ N~1@RT|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; k1N$+h ;\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); : iY$82wQ  
 BITMAPINFOHEADER bih; gb-{2p>}  
 bih.biBitCount=btm.bmBitsPixel; AO 0!liQ  
 bih.biClrImportant=0; @ Gjny BJ  
 bih.biClrUsed=0; X, fu!  
 bih.biCompression=0; A[/I#Im7  
 bih.biHeight=btm.bmHeight; ):6 -  
 bih.biPlanes=1; {E,SHh   
 bih.biSize=sizeof(BITMAPINFOHEADER); )3E,D~1e%  
 bih.biSizeImage=size; Z>A{i?#m  
 bih.biWidth=btm.bmWidth; g@nk.aRw  
 bih.biXPelsPerMeter=0; 3 (lVmfk  
 bih.biYPelsPerMeter=0; W"(u^}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); y8s=\`~PR  
 static int filecount=0; |'hLa  
 CString name; "G?9b  
 name.Format("pict%04d.bmp",filecount++); oh}^?p  
 name=m_Path+name; - @bp4Z=  
 BITMAPFILEHEADER bfh; a5wDm  
 bfh.bfReserved1=bfh.bfReserved2=0; M'jXve(=yF  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Dm{Ok#@r2  
 bfh.bfSize=54+size; T |"`8mG  
 bfh.bfOffBits=54; r?p{L F  
 CFile bf; 9Vh_[^bR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .)PqN s:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); CvTwBJy1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `^8*<+  
  bf.WriteHuge(lpData,size); |XcH]7Ai"  
  bf.Close(); -z C]^Ho@  
  nCount++; hLuJWjCV  
 } yFeeG3 n3  
 GlobalFreePtr(lpData); eK_*q -  
 if(nCount==1) ;) pl{_  
  m_Number.Format("%d picture captured.",nCount); ~$aTM_4  
 else n9}RW;N+u  
  m_Number.Format("%d pictures captured.",nCount); YF[$Q=7.  
  UpdateData(FALSE); pC^[[5A  
} >[3X]n,0  
uW[3G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dtW0\^ .L  
{ *TnzkNN_,  
 if(pMsg -> message == WM_KEYDOWN) qZ\ L  
 { YOw?'+8  
  if(pMsg -> wParam == VK_ESCAPE) "3y}F  
   return TRUE; k,_i#9 X  
  if(pMsg -> wParam == VK_RETURN) YN#XmX%  
   return TRUE; :WX0,-Gn  
 } !C`20,U  
 return CDialog::PreTranslateMessage(pMsg); +i)AS0?d  
} $%He$t  
,f<B}O  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^ KAG|r9  
{ zD_H yGf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ VD;j[~/Z  
  SaveBmp(); #]zhZW4  
  return FALSE; W8* 2;F]  
} QMb^&?;s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5b fb!7-[i  
 CMenu pop; 5c;En6W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AN10U;p/O  
 CMenu*pMenu=pop.GetSubMenu(0); uC[d%v`  
 pMenu->SetDefaultItem(ID_EXITICON); ;Q90Y&{L=$  
 CPoint pt; H-a^BZ&iU  
 GetCursorPos(&pt); x u,htx  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wP`sXPSmIu  
 if(id==ID_EXITICON)  coAW9=o}  
  DeleteIcon(); ;IhPvff  
 else if(id==ID_EXIT) 9HKf^+';n  
  OnCancel(); 3kw}CaZ6  
 return FALSE; xMsGs  
} \^s2W:c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]wf |PU~nr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u:5IjOb2^  
 AddIcon(); $3:X+X  
 return res; \_>?V5(  
} 7vNtv9  
UT;4U;a,m  
void CCaptureDlg::AddIcon() ~,Mr0  
{ xppkLoPK  
 NOTIFYICONDATA data; ;+9(;  
 data.cbSize=sizeof(NOTIFYICONDATA); EE9vk*[@C  
 CString tip; 3{q[q#"  
 tip.LoadString(IDS_ICONTIP); `oPLl0  
 data.hIcon=GetIcon(0); ?%;B`2 nDR  
 data.hWnd=GetSafeHwnd(); L5C2ng>  
 strcpy(data.szTip,tip); }{=8&gA0  
 data.uCallbackMessage=IDM_SHELL; /&QQ p3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x _|>n<Z  
 data.uID=98; qOgtGN}k  
 Shell_NotifyIcon(NIM_ADD,&data); bQV("~#  
 ShowWindow(SW_HIDE);  2$)mC9  
 bTray=TRUE; 1gk0l'.z  
} X#7}c5^Y  
PvuAg(?  
void CCaptureDlg::DeleteIcon() *k [kV  
{ _Z.;u0Zp8  
 NOTIFYICONDATA data; khS/'b  
 data.cbSize=sizeof(NOTIFYICONDATA); /x O{ .dr  
 data.hWnd=GetSafeHwnd(); Vku#;:yUb^  
 data.uID=98; p_gA/. v=  
 Shell_NotifyIcon(NIM_DELETE,&data); PS/W h  
 ShowWindow(SW_SHOW); -;<>tq'3`  
 SetForegroundWindow(); d}VALjXHX!  
 ShowWindow(SW_SHOWNORMAL); t .L4%1OF  
 bTray=FALSE; DA=qeVBg  
} &58 {  
V0S6M^\DK  
void CCaptureDlg::OnChange() #AvEH=:  
{ %A=|'6)k2  
 RegisterHotkey(); QSv^l-<  
} lT3|D?sF  
*LEu=3lp%>  
BOOL CCaptureDlg::RegisterHotkey() bkkSIl+Q  
{ *bU% @O  
 UpdateData(); ik1XGFy?  
 UCHAR mask=0; >F~ITk5`Oo  
 UCHAR key=0;  kMqD iJ  
 if(m_bControl) d[" x= [f  
  mask|=4; 3Cd<p[%3#,  
 if(m_bAlt) [xWEf#', !  
  mask|=2; mDlCt_h  
 if(m_bShift) W0U`Kt&~a  
  mask|=1; /t$*W\PL@  
  key=Key_Table[m_Key.GetCurSel()]; KZZOi:  
 if(bRegistered){ F6DxvyANr  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :+<t2^)rD  
  bRegistered=FALSE; EZ*t$3.T  
 } Dl&PL  
 cMask=mask; x g{VP7  
 cKey=key; f~U#z7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); G~`'E&/  
 return bRegistered; f%L:<4  
}  c,.0d  
l$=Gvb  
  四、小结 prqT(1  
u*U_7Uw$  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八