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用Visual C++实现屏幕抓图程序

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 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: *Ym+xu_5  
  Wx8;+!2Q/  
  一、实现方法 O:dUzZR['  
7[}WvfN8#  
  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: zaE!=-U  
*mN8Qd  
#pragma data_seg("shareddata") ;47=x1j i  
HHOOK hHook =NULL; //钩子句柄 "&mwrjn"T  
UINT nHookCount =0; //挂接的程序数目 HZ\=NDz  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +H!aE}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  GU xhn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I#zL-RXT  
static int KeyCount =0; YDEb MEMd/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 *#'&a(h B!  
#pragma data_seg() >SD?MW 1E  
v\XO?UEJ2  
  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。 Xd&oERJj  
K%/g!t)  
  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: Ge76/T%{Q  
"(:8 $Fb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR wee5Nirw6  
cKey,UCHAR cMask) b/=>'2f  
{ ?;go5f+X  
 BOOL bAdded=FALSE; 0LP>3"Sm  
 for(int index=0;index<MAX_KEY;index++){ r \} O{ZO  
  if(hCallWnd[index]==0){ /(i~Hpp  
   hCallWnd[index]=hWnd; S's I[?\x  
   HotKey[index]=cKey; ZXWm?9uw  
   HotKeyMask[index]=cMask; o6r ^  
   bAdded=TRUE; A{52T]9X  
   KeyCount++; ^ =H 10A  
   break; e4 cWi  
  } 1qwJPM  
 } Aac7k m  
 return bAdded; ' PmBNT  
} 4WQ 96|F  
//删除热键 }i\_`~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;{g>Z|  
{ S,C/l1s  
 BOOL bRemoved=FALSE; zc>LwX}<  
 for(int index=0;index<MAX_KEY;index++){ pz/vvH5  
  if(hCallWnd[index]==hWnd){ !(N,tZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N3Z6o.k  
    hCallWnd[index]=NULL; e73zpF  
    HotKey[index]=0; W-vEh  
    HotKeyMask[index]=0; <*$IZl6I  
    bRemoved=TRUE; o31pF  
    KeyCount--; <9?`zo$y  
    break; ;3sJ7%`v  
   } d^XRkB:h  
  } cX48?srG  
 } kn6X I*  
 return bRemoved; y~+U(-&.  
} y1Yrf,E m=  
g U v`G  
0 oHnam  
  DLL中的钩子函数如下: {`[u XH?3d  
P.]O8r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AW`+lE'?  
{ X FvPc  
 BOOL bProcessed=FALSE; 2aW"t.[j  
 if(HC_ACTION==nCode) I~7eu&QZ  
 { n0=[N'Tw3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JA^Y:@<{/  
   switch(wParam) b/'RJQSAc  
   {  a(eUdGJ  
    case VK_MENU: l":Z. J  
     MaskBits&=~ALTBIT; A(qy>x-BI  
     break; Kj*:G!r0.:  
    case VK_CONTROL: %!Ak]|[7  
     MaskBits&=~CTRLBIT; P 4jg]g  
     break; 4 O~zkg  
    case VK_SHIFT: wLH[rwPr  
     MaskBits&=~SHIFTBIT; n$(_(&  
     break; O8WLulo  
    default: //judge the key and send message nHmi%R7k  
     break; RU GhhK  
   } npdpKd+*K"  
   for(int index=0;index<MAX_KEY;index++){ {!7 ^ w  
    if(hCallWnd[index]==NULL) +"2IQme5  
     continue; i^u5j\pfY*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l+i9)Fc<i  
    { !3#*hL1fy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "]D2}E>U;  
     bProcessed=TRUE; 6/eh~ME=  
    } F;_L/8Ov1  
   } ?W4IAbT\G  
  } :g=z}7!s  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ym "Nj  
   switch(wParam) X'h J&-[P  
   { w>$2  
    case VK_MENU: xQ7-4 N,  
     MaskBits|=ALTBIT; sDvtk]4o-4  
     break; 4V0j1 k&'  
    case VK_CONTROL: HX:rVHY  
     MaskBits|=CTRLBIT; }[*BC5{>  
     break; o  w<.Dh  
    case VK_SHIFT: ] 6rr;S  
     MaskBits|=SHIFTBIT; y9L:2f\  
     break; Wo+'j $k  
    default: //judge the key and send message rN%aP-sa<  
     break; 2Aq%;=+*  
   } X"qC&oZmf  
   for(int index=0;index<MAX_KEY;index++){ :TzHI    
    if(hCallWnd[index]==NULL) d*xKq"+ &E  
     continue; 6P KH%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4RV5:&ALLS  
    { U[UjL)U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !mLY W  
     bProcessed=TRUE; 5>'1[e45  
    } }2eP~3  
   } Ou<Vg\Mu  
  } 2qD80W<1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a,sU-w!X'  
   for(int index=0;index<MAX_KEY;index++){ h&}XG\ioNA  
    if(hCallWnd[index]==NULL) F7zBm53  
     continue; REvY`   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Cp 2$I<T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @< @\CiM  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^q0Ox&X  
   } $pm5G} .  
  } [LJ1wBMw  
 } T};fy+iq  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E#=slj @  
} r!vSYgee  
`kd P)lI `  
  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: 3tlA! e  
7#BpGQJQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hw [G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K2glkGK  
_pv<_ Sm  
  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: R8 lBh Ls  
45;{tS.z,B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CYZx/r<  
{ ?=;dNS@i@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OJL?[<I  
 { /M;A)z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yI 6AafS~  
  SaveBmp(); p Rn vd|  
  return FALSE; *hp3w  
 } HV ^*_  
 …… //其它处理及默认处理 N!}r(Dd*  
} jc|"wN]  
W^Jh'^E  
0N~AQu  
  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。 8uR4ZE*  
8Ilg[Drj*  
  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。 0# D4;v  
2V0gj /&  
  二、编程步骤 0\*6U H  
%z&=A%'a  
  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"; ]R8}cbtU  
ROr..-[u  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +IiL(\ew  
~7tG%{t%  
  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; u:Q_XXT5  
S"iz fQ@  
  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; UGNFWZ c  
{]aB3  
  5、 添加代码,编译运行程序。 &n.7~C]R  
[WDtr8L  
三、程序代码 AKVll  
gu[3L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h^h!OQKQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) DbdxHuKa>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !YlyUHD  
#if _MSC_VER > 1000 jj,Y:  
#pragma once FfnW  
#endif // _MSC_VER > 1000 821@qr|`e  
#ifndef __AFXWIN_H__ mJaWzR  
#error include 'stdafx.h' before including this file for PCH }];8v+M  
#endif + j._NRXRH  
#include "resource.h" // main symbols /h=:heS4$  
class CHookApp : public CWinApp V/Q~NX N  
{ t'bzhPQO)f  
 public: H1H+TTZr  
  CHookApp(); * _puW x  
  // Overrides &}P{w  
  // ClassWizard generated virtual function overrides D=U"L-rRs  
  //{{AFX_VIRTUAL(CHookApp) t0*JinK I  
 public: yp=(wcJ  
  virtual BOOL InitInstance(); D&f(h][hH?  
  virtual int ExitInstance(); }4PIpDL  
  //}}AFX_VIRTUAL XY]|OZ7(  
  //{{AFX_MSG(CHookApp) xeqAFq=9?  
  // NOTE - the ClassWizard will add and remove member functions here. 0s"g%gq|  
  // DO NOT EDIT what you see in these blocks of generated code ! ppt`5F O  
  //}}AFX_MSG  R ^Wed  
  DECLARE_MESSAGE_MAP() ad).X:Qs  
}; >qjQ;z[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ULq#2l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d>z?JD t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =6Dz<Lq  
BOOL InitHotkey(); Z[Gs/D  
BOOL UnInit(); E"D+CD0  
#endif Sq,ZzMw  
s7?Q[vN  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t1,sG8Z  
#include "stdafx.h" LHjGlBy  
#include "hook.h" Y4]USU!PA  
#include <windowsx.h> zK`z*\  
#ifdef _DEBUG \K+LKa)  
#define new DEBUG_NEW /xmUu0H$R  
#undef THIS_FILE >1[Hk0 <x  
static char THIS_FILE[] = __FILE__; ^zPa^lo-  
#endif ;Ub;AqY  
#define MAX_KEY 100 u%FG% j?C  
#define CTRLBIT 0x04 &h.E B  
#define ALTBIT 0x02 ^NB @wuf7  
#define SHIFTBIT 0x01 E\2|  
#pragma data_seg("shareddata") )J&1uMp{  
HHOOK hHook =NULL; FI1R7A  
UINT nHookCount =0; &CCp@" +  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (B@:0}>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT H tIl;E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Fv \yhR  
static int KeyCount =0; w) o^?9T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d(RSn|[0  
#pragma data_seg()  GU99!.$  
HINSTANCE hins; 6@`Y6>}$_  
void VerifyWindow(); sfSM7f  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) mAkR<\?iTF  
//{{AFX_MSG_MAP(CHookApp) *Z*4L|zT  
// NOTE - the ClassWizard will add and remove mapping macros here. d5gYJ/Qv  
// DO NOT EDIT what you see in these blocks of generated code! ?ic7M  
//}}AFX_MSG_MAP ^J3\ U{B  
END_MESSAGE_MAP() qF m=(J%  
9s\;,!b  
CHookApp::CHookApp() N>?R,XM V  
{ lYkm1  
 // TODO: add construction code here, ;W6P$@'zs  
 // Place all significant initialization in InitInstance ?[>+'6  
} KD9Y  
1?\ #hemL  
CHookApp theApp; G*_$[|H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @N?A 0S/  
{ MsMNP[-l  
 BOOL bProcessed=FALSE; Y_n^6 ;  
 if(HC_ACTION==nCode) eIjn~2^  
 { qiQS:0|_  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zf~Em'g"3  
   switch(wParam) YNCQPN\v`1  
   { s^Lg*t 3I  
    case VK_MENU: %jKbRiz1u  
     MaskBits&=~ALTBIT; #8P9}WTno.  
     break; T0xU}  
    case VK_CONTROL: swv 1>52{  
     MaskBits&=~CTRLBIT; 9$7tB  
     break; %dMq'j  
    case VK_SHIFT: aW-'Jg=@H^  
     MaskBits&=~SHIFTBIT; X_Vj&{  
     break; .JIn(  
    default: //judge the key and send message X PnN"Y"y  
     break; ,B ]kX/W  
   } p`ai2`qC`  
   for(int index=0;index<MAX_KEY;index++){ DDh$n?2fd  
    if(hCallWnd[index]==NULL) QEIu}e6b  
     continue; ;C,D1_20Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {Muw4DV  
    { ng $`<~=)\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SB R=  
     bProcessed=TRUE; A7!!kR":  
    } :=u Ku'~  
   } 5!Y51R^c  
  } A<esMDX  
  else if((lParam&0xc000ffff)==1){ //Key down FV|/o%XqK  
   switch(wParam) ]i\C4*  
   { Gz)]1Z{%$  
    case VK_MENU: ,zmGKn#n2  
     MaskBits|=ALTBIT; z7X[$T$V  
     break; _:4n&1{.E  
    case VK_CONTROL: #Pi}2RBRu  
     MaskBits|=CTRLBIT; :|i jCg+  
     break; V$O{s~@ti  
    case VK_SHIFT: ~Y^ UP  
     MaskBits|=SHIFTBIT; qE73M5L&  
     break; %,Fx qw  
    default: //judge the key and send message /(-X[[V  
     break; 03aa>IO  
   } 4#H~g @  
   for(int index=0;index<MAX_KEY;index++) C]{:>= K  
   { k[3J5 4`g1  
    if(hCallWnd[index]==NULL) Y'6GY*dL  
     continue; /8 /2#`3R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ptXCM[Z+  
    { 1RC(T{\x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u'"VbW3u n  
     bProcessed=TRUE; >W%tEc  
    } #SiOx/  
   } B=K& +  
  } FbRq h|  
  if(!bProcessed){ Dk&@AjJga  
   for(int index=0;index<MAX_KEY;index++){ {L 7O{:J  
    if(hCallWnd[index]==NULL)  p]z *  
     continue; kae &,'@JF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L' w }  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c=]z%+,b]  
   } u*/.   
  } Ar@" K!TS  
 } ]<\Ft H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (h;4irfX  
} zX+NhTTB  
G[7Z5)2B  
BOOL InitHotkey() AN ;SRl  
{ .H,v7L,~88  
 if(hHook!=NULL){ uzA"+cV5  
  nHookCount++; U2  0@B`<  
  return TRUE; I@x^`^+l  
 } l_ /q/8-l  
 else go^?F- dZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); IyvJwrO  
  if(hHook!=NULL) f=%k9Y*)  
   nHookCount++; <1~5l ~  
  return (hHook!=NULL); ]+RBykr  
} .32]$vx  
BOOL UnInit() Nrp0z:  
{ ,[6N64fy  
 if(nHookCount>1){ no_(J>p^&  
  nHookCount--; #Fx$x#Gc@y  
  return TRUE; v`i9LD0(  
 } :]&O  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KtWn08D!  
 if(unhooked==TRUE){ Kfho:e,  
  nHookCount=0; Dk$[b9b  
  hHook=NULL; wm>I;|gA)  
 } ZuV/!9qU  
 return unhooked; e RiPC  
} /ekeU+j  
1+\ZLy!5:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 04eE\%?  
{ ^_dYE]t  
 BOOL bAdded=FALSE; &m@~R|  
 for(int index=0;index<MAX_KEY;index++){ E3bS Q  
  if(hCallWnd[index]==0){ [gK (x%  
   hCallWnd[index]=hWnd; px!lJtvgo  
   HotKey[index]=cKey; 8*O]  
   HotKeyMask[index]=cMask; zNe>fZ  
   bAdded=TRUE; pF~[  
   KeyCount++; u(W%snl  
   break; .qBL.b_`  
  } E .2b@  
 } /:-8 ,`  
 return bAdded; &%."$rC/0b  
}  WW5AD$P*  
* !4r}h`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ? OrRTRW  
{ zd1X(e<|{  
 BOOL bRemoved=FALSE; F/BB]gUB  
 for(int index=0;index<MAX_KEY;index++){ 5r#0/1ym!  
  if(hCallWnd[index]==hWnd){ EA@p]+P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7GN>o@t  
    hCallWnd[index]=NULL; O>P792)  
    HotKey[index]=0; )TNAgTmqK  
    HotKeyMask[index]=0; @f<q&K%FJ  
    bRemoved=TRUE; :_ _z?<?(  
    KeyCount--; y7[D9ZvZ  
    break; !/pE6)a  
   } ySyA!Z  
  } gmG M[c\  
 } =pQ'wx|>|  
 return bRemoved; Uy8r !9O  
} {FV_APL9_  
Ja$Ple*XU8  
void VerifyWindow() k%UE^  
{ //9M~qHa"  
 for(int i=0;i<MAX_KEY;i++){ tbbZGyg5b  
  if(hCallWnd!=NULL){ P+tnXT>nE  
   if(!IsWindow(hCallWnd)){ 83rtQ ;L  
    hCallWnd=NULL; O3Jp:.ps  
    HotKey=0; ;MD6iBD  
    HotKeyMask=0; GEJEhwO;H  
    KeyCount--; eBw6k09C+  
   } 9 gt$z}oU  
  } =u M2l  
 } lFHj]%Y  
} R*m=V{iu`  
h_O6Z2J1  
BOOL CHookApp::InitInstance() LEnm6  
{ 5v&mK 5zZ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lPA:aHcj  
 hins=AfxGetInstanceHandle(); >]DnEF&  
 InitHotkey(); /5@4}m>Z@  
 return CWinApp::InitInstance(); :Taequk  
} 6 w"-&  
+4<Ij/}p  
int CHookApp::ExitInstance() &~ =q1?  
{ 8T3j/ D<r  
 VerifyWindow(); 3vs;ZBM  
 UnInit(); zq(R!a6  
 return CWinApp::ExitInstance(); Q& p'\6~  
} K x7'm1  
\\\%pBT7]\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $JH_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #0yU K5J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *{}Y :  
#if _MSC_VER > 1000 xW`,@a }  
#pragma once Tnw0S8M  
#endif // _MSC_VER > 1000 Xi^#F;@sU  
y]dA<d?u  
class CCaptureDlg : public CDialog e!+_U C  
{ Hzd tR  
 // Construction #;l~Y}7'  
 public: 9d4Agj M  
  BOOL bTray; 0~.OMG:=  
  BOOL bRegistered; x  RV@ _  
  BOOL RegisterHotkey(); Ne6]?\Z  
  UCHAR cKey; !1g2'  
  UCHAR cMask; <,r(^Ntz  
  void DeleteIcon(); G}MJWf Hl  
  void AddIcon(); l$j/Ye]  
  UINT nCount; '"# W!p  
  void SaveBmp(); zUw=e}?:  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e MX?x7  
  // Dialog Data "oZ$/ap\  
  //{{AFX_DATA(CCaptureDlg) /wF*@/PTH  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z?IwR  
  CComboBox m_Key; GqYE=Q  
  BOOL m_bControl; (]wd8M  
  BOOL m_bAlt; .?C-J  
  BOOL m_bShift; cjTV~(i'4A  
  CString m_Path; . fZ*N/  
  CString m_Number; AD_aI %7  
  //}}AFX_DATA 8SJi~gV  
  // ClassWizard generated virtual function overrides j?5s/  
  //{{AFX_VIRTUAL(CCaptureDlg) C(t >ZR  
 public: }ioHSkCD  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0vu$dxb[  
 protected: BQWe8D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .{pc5eUf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :$=r^LSH  
  //}}AFX_VIRTUAL  4[\[Ho  
  // Implementation WfnBWSA2 T  
 protected: ynWF Y<VX  
  HICON m_hIcon; ukZ>_ke`+  
  // Generated message map functions G-vBJlt=t  
  //{{AFX_MSG(CCaptureDlg) vMDX  
  virtual BOOL OnInitDialog(); T B!z:n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Y Ib=rR[ $  
  afx_msg void OnPaint(); 3k5C;5  
  afx_msg HCURSOR OnQueryDragIcon();  L=Pz0  
  virtual void OnCancel(); 3,x|w  
  afx_msg void OnAbout(); n"p|tEK  
  afx_msg void OnBrowse(); Stw%OP@?  
  afx_msg void OnChange(); #&L[?jEn  
 //}}AFX_MSG xEX"pd  
 DECLARE_MESSAGE_MAP() {6V;$KqH6  
}; aGUKpYF  
#endif `i'72\(  
SCXH{8SS  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &mG1V  
#include "stdafx.h" Xm#E99  
#include "Capture.h" nDt1oM H  
#include "CaptureDlg.h" %fv;C  
#include <windowsx.h> |H!kU.f]  
#pragma comment(lib,"hook.lib") =\t%U5  
#ifdef _DEBUG m1](f[$  
#define new DEBUG_NEW x4r=ENO)q  
#undef THIS_FILE V3^=Mj2"  
static char THIS_FILE[] = __FILE__; R]s\s[B  
#endif E{Gkq:  
#define IDM_SHELL WM_USER+1 Nb[zm|.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R:Pw@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #Tr>[ZC  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M/O4JZEqh  
class CAboutDlg : public CDialog &p."` C  
{ 4| 6<nk_  
 public: }D/O cp~o  
  CAboutDlg(); ]8Eci^i  
  // Dialog Data =V)88@W  
  //{{AFX_DATA(CAboutDlg) BA1|%:.   
  enum { IDD = IDD_ABOUTBOX }; 1$Jria5n  
  //}}AFX_DATA FEdWe\E  
  // ClassWizard generated virtual function overrides m!Iax]D{  
  //{{AFX_VIRTUAL(CAboutDlg) tA*hh"9  
 protected: KGVAP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iyj,0T  
  //}}AFX_VIRTUAL ?Re6oLm<B  
  // Implementation J ejDF*Q  
 protected: ?u*gKI  
  //{{AFX_MSG(CAboutDlg) U',.'"m  
  //}}AFX_MSG j@j%)CCM  
  DECLARE_MESSAGE_MAP() E[z8;A^:0  
}; mnZS](>  
TA x9<'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l'pu?TP{a  
{ tHvc*D  
 //{{AFX_DATA_INIT(CAboutDlg) HQpw2bdy  
 //}}AFX_DATA_INIT c h_1 -  
} li U=&wM>  
5|4=uoA<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) st b)Tl^  
{ -{ae  
 CDialog::DoDataExchange(pDX); aMUy^>  
 //{{AFX_DATA_MAP(CAboutDlg) 8 |@WuD  
 //}}AFX_DATA_MAP %lr<;   
} |GDf<\  
[(hB%x_"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Oq7R^t`b  
 //{{AFX_MSG_MAP(CAboutDlg) oj8_e xx  
 // No message handlers Sxj _gn  
 //}}AFX_MSG_MAP 86]})H  
END_MESSAGE_MAP() S%+$  
YTQom!O  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )Mtw9[  
: CDialog(CCaptureDlg::IDD, pParent) UL46%MFQ\  
{ 0+i\j`O&  
 //{{AFX_DATA_INIT(CCaptureDlg) &WqKsH$  
  m_bControl = FALSE; 6I)1[tU  
  m_bAlt = FALSE; dzK]F/L]  
  m_bShift = FALSE; j:JM v  
  m_Path = _T("c:\\"); vlHE\%{  
  m_Number = _T("0 picture captured."); x6d0yJ <  
  nCount=0; h`_@eax  
  bRegistered=FALSE; @V9qbr= Z  
  bTray=FALSE; TQcEe@$)  
 //}}AFX_DATA_INIT (>E}{{>2r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ap{2*o  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); RpAtd^I  
} P3due|4M  
#4?(A[]>H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ndsu}:my  
{ |5ifgSZ  
 CDialog::DoDataExchange(pDX); f;Iaf#V_  
 //{{AFX_DATA_MAP(CCaptureDlg) H-*"%SJ  
  DDX_Control(pDX, IDC_KEY, m_Key); 0Hs\q!5Q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M"E ]r=1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); w""5T|  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HjX!a29Wf  
  DDX_Text(pDX, IDC_PATH, m_Path); *\UxdL 22  
  DDX_Text(pDX, IDC_NUMBER, m_Number); c|kQ3(  
 //}}AFX_DATA_MAP ;[)t*yAh  
} liYR8D |  
5M.KF;P  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 97$1na3gq  
//{{AFX_MSG_MAP(CCaptureDlg) #WOb&h  
 ON_WM_SYSCOMMAND() 7c:5 Ey  
 ON_WM_PAINT() jq4'=L$4  
 ON_WM_QUERYDRAGICON() 4z~%gt74O]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) &HPzm6.3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 33R_JM{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /,>@+^1  
//}}AFX_MSG_MAP ~-"<)XPe  
END_MESSAGE_MAP() OMr&f8  
,| \62B`  
BOOL CCaptureDlg::OnInitDialog() 0(uNFyIG  
{ xk1pZQ8c  
 CDialog::OnInitDialog(); ?~mw  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1I'ep\`"X  
 ASSERT(IDM_ABOUTBOX < 0xF000); aS7[s6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Ly0U')D:  
 if (pSysMenu != NULL) A.mIqu,:  
 { [M^ur%H  
  CString strAboutMenu; `=]I -5#.W  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Dn[iA~  
  if (!strAboutMenu.IsEmpty()) 9Q!X~L|\S  
  { ,W'?F9Y\  
   pSysMenu->AppendMenu(MF_SEPARATOR); {kLL&`ii  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?c vXuxCm  
  } &DqeO8?Q  
 } _ ]W }6?i  
 SetIcon(m_hIcon, TRUE); // Set big icon nUAs:Q  
 SetIcon(m_hIcon, FALSE); // Set small icon /r4QDwu  
 m_Key.SetCurSel(0); .js@F/H p  
 RegisterHotkey(); Iw ? M>'l  
 CMenu* pMenu=GetSystemMenu(FALSE); +sTZ) 5vQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nly`\0C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hBSci|*f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Lv;R8^n  
 return TRUE; // return TRUE unless you set the focus to a control ` "Gd/  
} V9v80e {n4  
t^|+|>S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]-6=+\]   
{ qR W WG&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lgxG:zAC  
 { ,{@,dw`lUz  
  CAboutDlg dlgAbout; !wws9   
  dlgAbout.DoModal(); _&/FO{F@m  
 } Q k`yK|(0=  
 else 4eSV( u)4  
 { Wr\rruH6  
  CDialog::OnSysCommand(nID, lParam); i;1EXM  
 } x5Sc+5?*  
} x<  Td  
F5CV<-jB  
void CCaptureDlg::OnPaint() lP@/x+6tg  
{ +^St"GWY  
 if (IsIconic()) 1U"Fk3  
 { @K 8sNPK  
  CPaintDC dc(this); // device context for painting t~xp&LQiY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [:HT=LX3  
  // Center icon in client rectangle ]-o0HY2  
  int cxIcon = GetSystemMetrics(SM_CXICON); GEg8\  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9(%ptnya  
  CRect rect; &Rgy/1  
  GetClientRect(&rect); /4\!zPPj.  
  int x = (rect.Width() - cxIcon + 1) / 2; =YPvh]][  
  int y = (rect.Height() - cyIcon + 1) / 2; P1f?'i ?J  
  // Draw the icon ")l_>y ?  
  dc.DrawIcon(x, y, m_hIcon); UB3b  
 } $K)9(DD  
 else 0|0<[:(hc  
 { 8:j8>K*6  
  CDialog::OnPaint(); u S$:J:Drx  
 } $-dz1}  
} 2 {lo  
`+~@VZ3m  
HCURSOR CCaptureDlg::OnQueryDragIcon() \ 9T;-]  
{ OzFA>FK0f;  
 return (HCURSOR) m_hIcon; WJG&`PP  
} L< MIl[z7  
OUY 65K  
void CCaptureDlg::OnCancel() ( }DCy23  
{ :*wnO;eN  
 if(bTray) jk0Ja@8PK  
  DeleteIcon(); C0\A  
  CDialog::OnCancel(); AiXxn'&i  
} i,=CnZCh  
-[kbHrl&  
void CCaptureDlg::OnAbout() b"+ J8W  
{ M1Jnn4w*d  
 CAboutDlg dlg; \R >!HY  
 dlg.DoModal(); iJg3`1@j  
} ]M|Iy~ X   
+jcg[|-' /  
void CCaptureDlg::OnBrowse() ,+0>p  
{ 9JHu{r"M  
 CString str; Sm2 |I6  
 BROWSEINFO bi; LTsG  
 char name[MAX_PATH]; +zpmy3Q  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W s!N%%g  
 bi.hwndOwner=GetSafeHwnd(); hP4*S^l  
 bi.pszDisplayName=name; G]fl33_}l  
 bi.lpszTitle="Select folder"; `[JX}<~i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Re <G#*^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v)(tB7&`=  
 if(idl==NULL) >$]SYF29  
  return; f#:7$:{F1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g;U f?  
 str.ReleaseBuffer(); ;Ry )^5Q  
 m_Path=str; z.f~wAT@<  
 if(str.GetAt(str.GetLength()-1)!='\\') 2}P<}-?6  
  m_Path+="\\"; q9j9"M'  
 UpdateData(FALSE); )-FQ_K%  
} 2M>Y3Q2Yv  
5b_[f(  
void CCaptureDlg::SaveBmp() RVmD&  
{ v*Qr(4  
 CDC dc; i[b?W$]7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pIh%5Z U  
 CBitmap bm; uy~KJn?Tu  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2nOoG/6 E  
 int Height=GetSystemMetrics(SM_CYSCREEN); K (yuL[p`  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0:^L>MO  
 CDC tdc; > m GO08X  
 tdc.CreateCompatibleDC(&dc); ?@ ei_<A{  
 CBitmap*pOld=tdc.SelectObject(&bm); z T|]!',  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .'Vjs2 2  
 tdc.SelectObject(pOld); 'J^E|1P  
 BITMAP btm; .S&S#}$/]  
 bm.GetBitmap(&btm); v_*E:E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ".z~c%'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !m"(SJn"  
 BITMAPINFOHEADER bih; `vJ+ sRf  
 bih.biBitCount=btm.bmBitsPixel; %gB 0\C  
 bih.biClrImportant=0; Z']D8>d  
 bih.biClrUsed=0; YcS }ug7  
 bih.biCompression=0; (o,&P9  
 bih.biHeight=btm.bmHeight; XfF Z;ul  
 bih.biPlanes=1; FAAqdK0  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6Cut[*lj^  
 bih.biSizeImage=size; I(r^q"  
 bih.biWidth=btm.bmWidth; [o)P  
 bih.biXPelsPerMeter=0; J;Az0[qMR  
 bih.biYPelsPerMeter=0; #2c-@),  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5-|fp(Ww_W  
 static int filecount=0; Qci<cVgP  
 CString name; N1ZHaZ  
 name.Format("pict%04d.bmp",filecount++); F kas*79  
 name=m_Path+name; $smzP.V  
 BITMAPFILEHEADER bfh; &$fe%1#  
 bfh.bfReserved1=bfh.bfReserved2=0; F"9f6<ge  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ek'  
 bfh.bfSize=54+size; iq`y  
 bfh.bfOffBits=54; zzfwI@4  
 CFile bf; f<ABs4w  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ STp}?Cb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VIL #q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); kStWsc$;+T  
  bf.WriteHuge(lpData,size); B[F,D  
  bf.Close(); x,"'\=|s*  
  nCount++; vB, X)  
 }  hM2^[8  
 GlobalFreePtr(lpData); 'j];tO6GfC  
 if(nCount==1) V|vU17Cgy  
  m_Number.Format("%d picture captured.",nCount); }pKHa'/\  
 else DJlY~}v#_  
  m_Number.Format("%d pictures captured.",nCount); /OaLkENgvf  
  UpdateData(FALSE); VmrW\rH@  
} 6o&{~SV3  
c$ Kn.<a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Qh-k[w0  
{ fRJSo%  
 if(pMsg -> message == WM_KEYDOWN) s%`o  
 { Rxld$@~-(]  
  if(pMsg -> wParam == VK_ESCAPE) ZWW:-3  
   return TRUE; Y'kD_T`f,  
  if(pMsg -> wParam == VK_RETURN) + oyW_!(  
   return TRUE; D .| h0gU  
 } $H^hK0?'  
 return CDialog::PreTranslateMessage(pMsg); MId\ dFu  
} 6sl*Ko[  
zEJ|;oL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r'fNQJ >  
{ N4"%!.Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e-f_ #!bW  
  SaveBmp(); Gk2\B]{  
  return FALSE; 0Ph,E   
} 4O[T:9mn0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &O(z|-&| x  
 CMenu pop; b #|M-DmT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |SXMd'<3`Z  
 CMenu*pMenu=pop.GetSubMenu(0); z7F~;IB*u  
 pMenu->SetDefaultItem(ID_EXITICON); '6u;KIG  
 CPoint pt; I'G$:GX  
 GetCursorPos(&pt); AEm?g$a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;5-Sn(G  
 if(id==ID_EXITICON) kc `Q- N}  
  DeleteIcon(); %VsuG A  
 else if(id==ID_EXIT) <pRb#G"  
  OnCancel(); J\XYUs  
 return FALSE; lKEdpF<  
} 9 8bmia&H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v#:#w.]-Y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) YS k,kU  
 AddIcon(); <T:u&Ic  
 return res; OUn,URI  
} R@t?!`f!+  
UO8#8  
void CCaptureDlg::AddIcon() Z2`(UbG}  
{ o <8L, u(U  
 NOTIFYICONDATA data; $zq`hI!1  
 data.cbSize=sizeof(NOTIFYICONDATA); 9)s=%dL  
 CString tip; I(ds]E ;_E  
 tip.LoadString(IDS_ICONTIP); Z6SM7? d  
 data.hIcon=GetIcon(0); z^S=ji U++  
 data.hWnd=GetSafeHwnd(); ;id0|x  
 strcpy(data.szTip,tip); K=VYR Y  
 data.uCallbackMessage=IDM_SHELL; VWd=7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; o6  
 data.uID=98; hT9fqH  
 Shell_NotifyIcon(NIM_ADD,&data); c3]ZU^  
 ShowWindow(SW_HIDE); F)) +a&O  
 bTray=TRUE; (F~i  
} FSd842O  
YmFJlMK  
void CCaptureDlg::DeleteIcon() uG&xtN8  
{ j*<H18^G  
 NOTIFYICONDATA data; =9FY;9  
 data.cbSize=sizeof(NOTIFYICONDATA); xl@l<  
 data.hWnd=GetSafeHwnd(); QRhR.:M\  
 data.uID=98; bNp RGhlV  
 Shell_NotifyIcon(NIM_DELETE,&data); > y"V%  
 ShowWindow(SW_SHOW); jTaEaX8+  
 SetForegroundWindow(); i}N'W V`!  
 ShowWindow(SW_SHOWNORMAL); & ,2XrXiFu  
 bTray=FALSE; `Q^G k{9P  
} >%x7-->IB  
] 7_ f'M1F  
void CCaptureDlg::OnChange() "zJ1vIZY  
{ _/MHi-]/.  
 RegisterHotkey(); 8-UlbO6  
} PYPs64kNC]  
!]7Z),s  
BOOL CCaptureDlg::RegisterHotkey() i]a0 "  
{ kJq8"Klg  
 UpdateData(); L;H(I@p(e  
 UCHAR mask=0; 7NV1w*> /  
 UCHAR key=0; Ly/"da  
 if(m_bControl) nJY#d;  
  mask|=4; 7"w r8  
 if(m_bAlt) y|Tb&XPD  
  mask|=2; :w:hqe|_  
 if(m_bShift) w4<1*u@${  
  mask|=1; j8WnXp_  
  key=Key_Table[m_Key.GetCurSel()]; \I1+J9Gl  
 if(bRegistered){ (e S4$$g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); v1<3y~'f  
  bRegistered=FALSE; M%5qx,JQY  
 } nAG2!2_8  
 cMask=mask; Y` Oz\W  
 cKey=key; 9lNO ~8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i[sHPEml(5  
 return bRegistered; A?<R9A  
} f1y3l1/  
f/&gR5  
  四、小结 vzM8U>M  
2Kovvh y#  
  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。
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