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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: fLg :+Ue<B  
  %:N;+1  
  一、实现方法 wnjAiIE5  
G#YBfPmr  
  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: oS^g "hQ`\  
GJIZu&C  
#pragma data_seg("shareddata") F/u i(4  
HHOOK hHook =NULL; //钩子句柄 . L9n  
UINT nHookCount =0; //挂接的程序数目 ]]9 VI0   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W4q |55  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Hq aay  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Ij2T h]  
static int KeyCount =0; a"m-&mN  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3?Fe( !@  
#pragma data_seg() -unQ 4G  
m+QZ|  
  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。 cJ#n<Rsz  
*r)dtI*  
  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: I{i6e'.jP  
E<'V6T9bi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5}TTf2&Xo#  
cKey,UCHAR cMask) "Pl.G[Buc-  
{ c)Ne/E{!0  
 BOOL bAdded=FALSE; s\e b  
 for(int index=0;index<MAX_KEY;index++){ ?tkl cYB  
  if(hCallWnd[index]==0){ a7sX*5t{R  
   hCallWnd[index]=hWnd; >Z>s R0s7  
   HotKey[index]=cKey; ^B$cfs@*  
   HotKeyMask[index]=cMask; M^{=&  
   bAdded=TRUE; 89UR w9  
   KeyCount++; {~`{bnx^]7  
   break; pfQ3Y$z  
  } YBL.R;^v  
 } Ac'pu,v  
 return bAdded; gjzU%{T ?  
} ,z~"Mst  
//删除热键 =g|5VXW5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !NMiWG4R  
{ S2 MJb  
 BOOL bRemoved=FALSE; z\-/R9E/5-  
 for(int index=0;index<MAX_KEY;index++){ Uf9L*Z'6il  
  if(hCallWnd[index]==hWnd){ ^t?vv;@}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ WsW]  1p  
    hCallWnd[index]=NULL; K!(hj '0.  
    HotKey[index]=0; U#`2~Qv/1  
    HotKeyMask[index]=0; ^qLesP#   
    bRemoved=TRUE; "~q~)T1Z  
    KeyCount--; S 59^$  
    break; tA^CuJR  
   } HV{W7)  
  }  0:$pJtx"  
 } NInZ~4:  
 return bRemoved; :xk+`` T  
} r-No\u_  
X/h|;C* 9  
MS\?+8|SV(  
  DLL中的钩子函数如下: kAs=5_?I  
"gt1pf~y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <vt}+uMzXv  
{ xy4P_  
 BOOL bProcessed=FALSE; 0xH&^Ia1B  
 if(HC_ACTION==nCode) ~9#'s'  
 { q4g)/x%nc  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 K%UjPzPWw  
   switch(wParam) W4(GI]`_+  
   {  6Zx5^f(qd  
    case VK_MENU: ~-UO^$M-  
     MaskBits&=~ALTBIT; h:i FLSf  
     break; /4;Sxx-  
    case VK_CONTROL: 3|%058bF  
     MaskBits&=~CTRLBIT; a7aj:.wi  
     break; "JE->iD  
    case VK_SHIFT: %~[@5<p  
     MaskBits&=~SHIFTBIT; pJIJ"o'>.9  
     break; uSv]1m_-]  
    default: //judge the key and send message H.[nr:  
     break; =t %;mi,M  
   } Ii!{\p!  
   for(int index=0;index<MAX_KEY;index++){ bX 6uGu 7  
    if(hCallWnd[index]==NULL) a% /D~5Z  
     continue; u/V&1In  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '7g]@Q7  
    { z:=E- +  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iNilk!d6Q3  
     bProcessed=TRUE; `dhBLAt  
    } YMVmpcz  
   } 6{I6'+K~  
  } ;U#=H9_  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^oR qu  
   switch(wParam) [=cYsW%WG  
   { Awr(}){  
    case VK_MENU: @"H7Q1Hg!*  
     MaskBits|=ALTBIT; s^m`qi(H  
     break; p0PK-e`@:  
    case VK_CONTROL: |.;]e[&  
     MaskBits|=CTRLBIT; H;0K4|I  
     break; KwgFh#e  
    case VK_SHIFT: 5n1`$T.WG  
     MaskBits|=SHIFTBIT; L`(\ud  
     break; VQ8Fs/Zt!  
    default: //judge the key and send message xVRxKM5 {  
     break; 8#[2]1X^8  
   } v]rbm}uU9  
   for(int index=0;index<MAX_KEY;index++){ /PbMt  
    if(hCallWnd[index]==NULL) 7}e5ac  
     continue; z]D/Qr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {$ > .I  
    { BAi`{?z$<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FAX[| p  
     bProcessed=TRUE; }z,9!{~`  
    } nJ$2RN  
   } TpI8mDO\W  
  } C-g,uARX(r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Z<QNzJ D  
   for(int index=0;index<MAX_KEY;index++){ pH(X;OC 9S  
    if(hCallWnd[index]==NULL) .hUlI3z9  
     continue; ,3!TyQ \m'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3!%-O:!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ""Oir!4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,5j3(Lk  
   } j& ykce  
  } f$vU$>+[  
 } 3i\Np =  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |kD69 }sG  
} |nm}E_  
(xKypc+j  
  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: }^VikT]>1  
\.>7w 1p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zF|c3ap  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iP@ FXJJ  
,v`03?8l(  
  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: ?9>wG7cps7  
]68 FGH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `\'V]9wS  
{ PHJHW#sv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C6Cr+TScH  
 { G6l C[eK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Xk1uCVUe5  
  SaveBmp();  \< dg  
  return FALSE; "zkQu  
 } YV} "#  
 …… //其它处理及默认处理 l]j;0i  
} EPR85[k  
[Jj@A(Cz  
$$EEhy  
  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。 1Oq VV?oz  
o+)y!  
  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。 <L<^uFB  
u /DE  
  二、编程步骤 q*tGlM@R?  
Ep:hObWG)  
  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"; Bs|Xq'1M!;  
C%{2 sMJz  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 78 ]Kv^l^_  
;?q}98-2  
  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; < Wp)Y  
k_uI&,  
  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;  \S1W,H|  
sKJr34  
  5、 添加代码,编译运行程序。 $M/1pZ  
8 nL9#b  
三、程序代码 4jGN:*kZ  
t0r0{:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _l1"X^Aa  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g-B{K "z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g^x=y  
#if _MSC_VER > 1000 C`.eJF  
#pragma once G e5Yz.Q v  
#endif // _MSC_VER > 1000 byMy- v;  
#ifndef __AFXWIN_H__ 0pG + yec  
#error include 'stdafx.h' before including this file for PCH ^,F G 9  
#endif U@CAQ?  
#include "resource.h" // main symbols w w[|| =  
class CHookApp : public CWinApp #XB3Wden2  
{ TU58  
 public: WRwx[[e6z  
  CHookApp(); Hc[@c)DH  
  // Overrides uqU&k@  
  // ClassWizard generated virtual function overrides yla- X|>  
  //{{AFX_VIRTUAL(CHookApp) t_*x.{x-  
 public: `& h-+  
  virtual BOOL InitInstance(); e+F $fQt>  
  virtual int ExitInstance(); [\Nmm4  
  //}}AFX_VIRTUAL ZJc{P5a1J  
  //{{AFX_MSG(CHookApp) r:$*pC&{  
  // NOTE - the ClassWizard will add and remove member functions here. m#i4_F=^b  
  // DO NOT EDIT what you see in these blocks of generated code ! xx|D#Z}G  
  //}}AFX_MSG |yz o|%]3  
  DECLARE_MESSAGE_MAP() ;\6@s3  
}; 60 cQ3.e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); mEu2@3^E }  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N ~fE&@-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i*$~uuY  
BOOL InitHotkey(); =wW M\f`=  
BOOL UnInit(); `(`-S md  
#endif JbJ!,86  
cruBJZr*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. =:zPT;K  
#include "stdafx.h" x X[WX#'f  
#include "hook.h" XjP &  
#include <windowsx.h> 6xwjKh:9  
#ifdef _DEBUG e$WAf`*  
#define new DEBUG_NEW 6({)O1Z  
#undef THIS_FILE Nnr[@^M5  
static char THIS_FILE[] = __FILE__; "Nb2[R  
#endif Y .cjEeL@  
#define MAX_KEY 100 6 C O5:\  
#define CTRLBIT 0x04 9 nY|S{L  
#define ALTBIT 0x02 B$YoglEW:  
#define SHIFTBIT 0x01 rx 74v!  
#pragma data_seg("shareddata") 'DNxc  
HHOOK hHook =NULL; kB=B?V~#  
UINT nHookCount =0; >)='.aR<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey H&%oHyK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TwVkI<e0s?  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey e`H>}O/ai  
static int KeyCount =0; O[eU{ ;P  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X }i2qv  
#pragma data_seg() US3)+6  
HINSTANCE hins; 9I2&Vx=DSt  
void VerifyWindow(); .-![ ra  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ],[<^=|  
//{{AFX_MSG_MAP(CHookApp) 7I#C[:7x  
// NOTE - the ClassWizard will add and remove mapping macros here. ?e4H{Y/M  
// DO NOT EDIT what you see in these blocks of generated code! U`8Er48X  
//}}AFX_MSG_MAP WagL8BpLx  
END_MESSAGE_MAP() 3c7i8b$  
&A.0(s  
CHookApp::CHookApp() {r$Ewc$Yb7  
{ 1aV32oK  
 // TODO: add construction code here, iGz*4^ %  
 // Place all significant initialization in InitInstance  E>i<2  
} FG{,l=Z0  
CLe{9-o  
CHookApp theApp; s8 MQ:eAP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4X7J~  
{ a#i|)[  
 BOOL bProcessed=FALSE; hGw}o,g  
 if(HC_ACTION==nCode) .9=4Af  
 { `q* p-Ju'  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~x/ka43  
   switch(wParam) @#hvQ6u  
   { = M4:nt  
    case VK_MENU: +Ek1~i.  
     MaskBits&=~ALTBIT; 9W]OtSG  
     break; |<,0*2  
    case VK_CONTROL: ti6X=@ P:  
     MaskBits&=~CTRLBIT; koS?UYF`  
     break; )u28:+8  
    case VK_SHIFT: &4}=@'G@  
     MaskBits&=~SHIFTBIT; ot2zY dWAz  
     break; 42tZBz&  
    default: //judge the key and send message vqQ)Pu?T  
     break; ILl~f\xG)  
   } ! l0"nPM=  
   for(int index=0;index<MAX_KEY;index++){ nK+ke)'Zv=  
    if(hCallWnd[index]==NULL) ,ayJgAD  
     continue; !9YCuHj!p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !X$19"  
    { Xx[,n-rA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }2e s"  
     bProcessed=TRUE; cuumQQ  
    } *c=vEQn-  
   } f(blqO.@l  
  } <]KQ$8dtD  
  else if((lParam&0xc000ffff)==1){ //Key down cLwnV.  
   switch(wParam) mIDVN  
   { *s" OqTM]x  
    case VK_MENU: ABe25Sus  
     MaskBits|=ALTBIT; IzUpkwN  
     break; f.^|2T I1g  
    case VK_CONTROL: 7)[Ve1;/N  
     MaskBits|=CTRLBIT; +[MHl  
     break; tu$rVwgM  
    case VK_SHIFT: DUl+Jqn4B  
     MaskBits|=SHIFTBIT; "+7E9m6I  
     break; 1:^Xd~X  
    default: //judge the key and send message r,Xyb`  
     break; OaY89ko  
   } ){#INmsF  
   for(int index=0;index<MAX_KEY;index++) V>Z4gZp5sc  
   { U_izKvEh  
    if(hCallWnd[index]==NULL) :Z2997@Y  
     continue; @#N7M2/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3Og}_  
    { ;n*|AL7(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~&RrlFh  
     bProcessed=TRUE; ?<W|Ya  
    } F:P2:s<d-  
   } rb4;@&  
  } `o }+2Cb  
  if(!bProcessed){ ^M q@} 0  
   for(int index=0;index<MAX_KEY;index++){ [pm IQ228  
    if(hCallWnd[index]==NULL) qWWt5rJ  
     continue; lOeX5%$Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F@q9UlfB-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /Mw;oP{&b  
   } )fIG4#%\  
  } r"{jrBK$  
 } ,<#Rk 'y$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ys`oHS f  
} 3T0-RP*  
iEr?s-or  
BOOL InitHotkey() ilJ`_QN  
{ 0k16f3uI   
 if(hHook!=NULL){ *<67h*|)  
  nHookCount++; <&) hg:  
  return TRUE; V,Nu!$)J  
 } =j- ,yxBvJ  
 else <7rj,O1=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =$gBWS  
  if(hHook!=NULL) #;^UW  
   nHookCount++; `Ji WS  
  return (hHook!=NULL); =Hd#"9-  
} ^JMG'@x  
BOOL UnInit() |,oLZC Na  
{ T!y 9v5  
 if(nHookCount>1){ EwV$2AK  
  nHookCount--; H,GjPIG  
  return TRUE; ,C><n kx  
 } \a|~#N3?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); lGR0-Gh2  
 if(unhooked==TRUE){ EZI#CLT[  
  nHookCount=0; $<2d|;7r  
  hHook=NULL; SZ[?2z  
 } 2 G*uv+=  
 return unhooked; aAGV\o{^  
} C^4,L \E  
3fQ`}OcNr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }cCIYt\RK  
{ YU[#4f~  
 BOOL bAdded=FALSE; 0wVM% Dng  
 for(int index=0;index<MAX_KEY;index++){ tl!dRV92  
  if(hCallWnd[index]==0){ #9[>  
   hCallWnd[index]=hWnd; xcmg3:s  
   HotKey[index]=cKey; s6!&4=ZA  
   HotKeyMask[index]=cMask; "~ $i#  
   bAdded=TRUE; ZpOME@9,  
   KeyCount++; uQdy  
   break; =gJ{75tV3  
  } fUWrR1  
 } JmR2skoV,  
 return bAdded; %Y;^$%X%_  
} [@VzpVhXz  
{X?1}5ry  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !<~.>5UQ  
{ + <E zv  
 BOOL bRemoved=FALSE; :ZB.I(v  
 for(int index=0;index<MAX_KEY;index++){ +8?18@obp  
  if(hCallWnd[index]==hWnd){ ,qp8Rg|3j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3]JJCaf  
    hCallWnd[index]=NULL; ."BXA8c;A  
    HotKey[index]=0; ;4b=/1M'  
    HotKeyMask[index]=0; ^ /G ;  
    bRemoved=TRUE; d-Z2-89K  
    KeyCount--; +VW8{=$  
    break; ,T zlW\?\  
   } 08^f|K  
  } `!I/6d?A  
 } )=K8mt0qob  
 return bRemoved; YV|_y:-  
} A+dx7anUz  
@#W4?L*D  
void VerifyWindow() Ieq_XF]U  
{ :^{KY(3  
 for(int i=0;i<MAX_KEY;i++){ Nk\ni>Du3  
  if(hCallWnd!=NULL){ ,ps?@lD  
   if(!IsWindow(hCallWnd)){ OZf@cOTWK  
    hCallWnd=NULL; ai?J  
    HotKey=0; 2Ul8<${c{  
    HotKeyMask=0; EHf,VIC8  
    KeyCount--; V~/@KU8cH  
   } '9.@r\g  
  } NV/paoyx:*  
 } iOv>g-t:  
} =e#h;x2  
:PN%'~}n  
BOOL CHookApp::InitInstance() Q~wS2f`)  
{ J`[jub  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wI 7gHp  
 hins=AfxGetInstanceHandle(); =kwz3Wv  
 InitHotkey(); tF/Ni*\^rV  
 return CWinApp::InitInstance(); #=y)Wuo=  
} ESoC7d&.K{  
'Y ,2CN  
int CHookApp::ExitInstance() x5PM ]~"p  
{ ,Il) tH  
 VerifyWindow(); ^}vf  
 UnInit(); @UdF6 :T  
 return CWinApp::ExitInstance(); q+8de_"]  
} AHuIA{AdUR  
[+b8 !'|&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #0h}{y E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) a)r["*bTx  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hTEb?1CXU  
#if _MSC_VER > 1000 [6g$;SicT  
#pragma once 4Lk<5Ho  
#endif // _MSC_VER > 1000 Dl0{pGK~  
Z~94<*LEp  
class CCaptureDlg : public CDialog C"5P7F{  
{ ;?iu@h  
 // Construction @ls/3`E/5E  
 public: 1|G\&T   
  BOOL bTray; nJv=kk1|o  
  BOOL bRegistered; T<Y*();Zo  
  BOOL RegisterHotkey(); 2<8l&2}7]  
  UCHAR cKey; s1[.L~;J  
  UCHAR cMask; ~e,l2 <  
  void DeleteIcon(); ~cO iv  
  void AddIcon(); b1'849i'y=  
  UINT nCount; `IBNBJy  
  void SaveBmp(); 5cA:;{z];g  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v]Pyz<+  
  // Dialog Data R%2.N!8v  
  //{{AFX_DATA(CCaptureDlg) 7>MG8pf3a  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z6Mjc/  
  CComboBox m_Key; W)f=\.7  
  BOOL m_bControl; vmNI$ KZM  
  BOOL m_bAlt; b5%<},ySq  
  BOOL m_bShift; l0t(t*[Mj  
  CString m_Path; l*wGKg"x3  
  CString m_Number; I<<1mEk  
  //}}AFX_DATA *K?UWi#$  
  // ClassWizard generated virtual function overrides d:A'|;']  
  //{{AFX_VIRTUAL(CCaptureDlg) E+<GsN]  
 public: _XY(Qd  
  virtual BOOL PreTranslateMessage(MSG* pMsg); cQd?,B3#F  
 protected: *v8daF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MK Sw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lq3D!+ m  
  //}}AFX_VIRTUAL `mD!z.`U  
  // Implementation F"M/gy  
 protected: jp4-w(  
  HICON m_hIcon; 54WX#/<Yik  
  // Generated message map functions ,S(Z\[x0  
  //{{AFX_MSG(CCaptureDlg) Hq>hnCT  
  virtual BOOL OnInitDialog(); c]U+6JH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Jh%SenP_oP  
  afx_msg void OnPaint(); 9o?\*{'KT  
  afx_msg HCURSOR OnQueryDragIcon(); pQ^V<6z}  
  virtual void OnCancel(); ct,;V/Dx  
  afx_msg void OnAbout(); F}[!OYyg  
  afx_msg void OnBrowse(); i-wWbZ-  
  afx_msg void OnChange(); x _-V{ k  
 //}}AFX_MSG )@Y< <9'2  
 DECLARE_MESSAGE_MAP() \pI {b9  
}; nW\W<[O9  
#endif !^NZp%Yd  
Hiwij,1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oz]3 Tx  
#include "stdafx.h" v/~&n  
#include "Capture.h" 8[AU`F8W  
#include "CaptureDlg.h" "G*$#  
#include <windowsx.h> S"^'ksL\  
#pragma comment(lib,"hook.lib") jd5kkX8=  
#ifdef _DEBUG sieC7raO  
#define new DEBUG_NEW 9qGba=}Ey  
#undef THIS_FILE :,$"Gk  
static char THIS_FILE[] = __FILE__; E^{!B]/oP  
#endif *+6iXMwe  
#define IDM_SHELL WM_USER+1 (5:pHX`P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f9y+-GhaD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 92D~trn  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r.Z g<T  
class CAboutDlg : public CDialog e9Gu`$K  
{ ?+Vi !eS  
 public: H13\8Te{  
  CAboutDlg(); J2oh#TGp  
  // Dialog Data u+6D|  
  //{{AFX_DATA(CAboutDlg) KC:6^h'.  
  enum { IDD = IDD_ABOUTBOX }; sHPeAa22  
  //}}AFX_DATA 74 )G.!  
  // ClassWizard generated virtual function overrides Tu}EAr  
  //{{AFX_VIRTUAL(CAboutDlg) =\)zb'\=d  
 protected: Rq?t=7fX)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /d"@$+  
  //}}AFX_VIRTUAL PX23M|$!  
  // Implementation V)5,E>;EN  
 protected: SE i\H$ !  
  //{{AFX_MSG(CAboutDlg) ?< yYm;B  
  //}}AFX_MSG 8vR'<_>Q  
  DECLARE_MESSAGE_MAP() 0/!0W%f[}  
}; <ycR/X  
o F_{oV '  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Y1ca=ewFx  
{ d9jD?HgM(  
 //{{AFX_DATA_INIT(CAboutDlg) }?6;;d#  
 //}}AFX_DATA_INIT pz/W#VN  
} !v%>W< 3Q  
!.pcldx  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) } C/+zF6q  
{ h|Qb:zEP,  
 CDialog::DoDataExchange(pDX); O<@L~S]  
 //{{AFX_DATA_MAP(CAboutDlg) ,(sE|B#s  
 //}}AFX_DATA_MAP *h).V&::O  
} qq[Dr|%7  
&0G9v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) EX, {1^h  
 //{{AFX_MSG_MAP(CAboutDlg) @ %q>Jd  
 // No message handlers ve.P{;;Ky  
 //}}AFX_MSG_MAP c\ ZnGI\|  
END_MESSAGE_MAP() 7\nXJ381  
S&[9Vb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) glROT@  
: CDialog(CCaptureDlg::IDD, pParent) ij3W8i9'  
{ ^liW*F"UY  
 //{{AFX_DATA_INIT(CCaptureDlg) |tLD^`bt  
  m_bControl = FALSE; 3q@JhB  
  m_bAlt = FALSE; (ToD u@p  
  m_bShift = FALSE; lS p"(&  
  m_Path = _T("c:\\"); w0H#M)c  
  m_Number = _T("0 picture captured."); :1bDkoK  
  nCount=0; (@^ySiU  
  bRegistered=FALSE; H;tE=  
  bTray=FALSE; fsnZHL}=n  
 //}}AFX_DATA_INIT J 48$l(l3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (64es)B}"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ${wp}<u_  
} &?xmu204  
/yY}.S  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +NvpYz  
{ L=HnVgBs  
 CDialog::DoDataExchange(pDX); x`IWo:j  
 //{{AFX_DATA_MAP(CCaptureDlg) 5~2_wWjX  
  DDX_Control(pDX, IDC_KEY, m_Key); g$hEVT  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); b<"jmB{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); WMWMb3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); v Lq%k+D#  
  DDX_Text(pDX, IDC_PATH, m_Path); SlT>S1`rnG  
  DDX_Text(pDX, IDC_NUMBER, m_Number); cQBc6eAi  
 //}}AFX_DATA_MAP #QSSpsF@  
} Sx0{]1J  
@k'V`ZQF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j]R[;8g  
//{{AFX_MSG_MAP(CCaptureDlg) T VSCjI  
 ON_WM_SYSCOMMAND() Ux=B*m1@{  
 ON_WM_PAINT() 0mmHN`<  
 ON_WM_QUERYDRAGICON() gnxD'1_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) alNn(0MG  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  _X=6M gU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) zA3r&stN+  
//}}AFX_MSG_MAP IQ-l%x[fue  
END_MESSAGE_MAP() kFyp;=d:K  
Lg#(?tMp,'  
BOOL CCaptureDlg::OnInitDialog() {7%HK2='  
{ \\Q){\S  
 CDialog::OnInitDialog(); 3=Rk(%:;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); R1%J6wZq  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q%J,: J  
 CMenu* pSysMenu = GetSystemMenu(FALSE); S}]B|Q  
 if (pSysMenu != NULL) OZ"76|H1`  
 { !g=b=YK  
  CString strAboutMenu; R2 J A(Hn  
  strAboutMenu.LoadString(IDS_ABOUTBOX); = 8y,7u)  
  if (!strAboutMenu.IsEmpty()) jWh)bsqI!  
  { !)W#|sys&  
   pSysMenu->AppendMenu(MF_SEPARATOR); [EZ=tk  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y(?SE< 4R  
  } |68/FJZ,5  
 } -O-?hsV)y  
 SetIcon(m_hIcon, TRUE); // Set big icon ObS#aRq  
 SetIcon(m_hIcon, FALSE); // Set small icon &uBf sa$  
 m_Key.SetCurSel(0); B8.}9  
 RegisterHotkey(); a+a6P5kJ  
 CMenu* pMenu=GetSystemMenu(FALSE); co^h2b  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zzW$F)X  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); l]&x~K}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rw gj]  
 return TRUE; // return TRUE unless you set the focus to a control ^L7!lzyo  
} &1`Y&x:p  
H/;AlN|!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;<GxonIV  
{ JV'aqnb.8\  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j*4:4B%  
 { 5tLb o  
  CAboutDlg dlgAbout; |Sua4~yL(  
  dlgAbout.DoModal(); 3/]FT#l]i  
 } y"U)&1 c%  
 else CY[3%7 fv  
 { $4)L~g|  
  CDialog::OnSysCommand(nID, lParam); 1~LfR  
 } v*<rNZI  
} koD}o^U#  
0]=Bqyg  
void CCaptureDlg::OnPaint() r_ B.b K  
{ 734n1-F?I%  
 if (IsIconic()) " *W# z  
 { e-\/1N84  
  CPaintDC dc(this); // device context for painting 3MKu!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ucU7 @j  
  // Center icon in client rectangle N`N?1!fM<}  
  int cxIcon = GetSystemMetrics(SM_CXICON); Zkqq<  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~ L>M-D4o  
  CRect rect; Q1|zX@,  
  GetClientRect(&rect); PDCb(5  
  int x = (rect.Width() - cxIcon + 1) / 2; Ze#DFe$  
  int y = (rect.Height() - cyIcon + 1) / 2; 7-}5 W  
  // Draw the icon EIyFGCw|U  
  dc.DrawIcon(x, y, m_hIcon); uZ>q$ F  
 } *">CEQ[MT  
 else 9d(#/n  
 { C+5X8  
  CDialog::OnPaint(); U0{)goN.  
 } dn Sb}J  
} .jtv Hr}U  
]+B.=mO_  
HCURSOR CCaptureDlg::OnQueryDragIcon() BF;}9QebmS  
{ p|dn&<kd  
 return (HCURSOR) m_hIcon; SBDGms  
} ,&o^}TFkg  
_G'A]O/BZD  
void CCaptureDlg::OnCancel() x#zj0vI-8  
{ A,=> |&*  
 if(bTray) 1\Pjz Lj  
  DeleteIcon(); u^CL }t*  
  CDialog::OnCancel(); i1m>|[@k  
} F[!%,-*  
tm2lxt  
void CCaptureDlg::OnAbout() V`W']  
{ o)7Ot\:E  
 CAboutDlg dlg; Iw h0PfWJ  
 dlg.DoModal(); :M f8q!Q'  
} -o{ x ;:4  
n"D` =  
void CCaptureDlg::OnBrowse() =NI?Jk*iAq  
{ 1,Mm+_)B  
 CString str; &/)B d%  
 BROWSEINFO bi; UL>2gl4s/  
 char name[MAX_PATH]; ~/z%yg  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~w|h;*Bj  
 bi.hwndOwner=GetSafeHwnd(); 'gg <)Bd  
 bi.pszDisplayName=name; g`fMHU7  
 bi.lpszTitle="Select folder"; i^ |G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :l1-s]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); g0}jE%)  
 if(idl==NULL) {x_cgsn  
  return; ',t*:GBZCf  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Rt&5s)O'  
 str.ReleaseBuffer(); y@1QVt04  
 m_Path=str; .y3E @0a  
 if(str.GetAt(str.GetLength()-1)!='\\') Th*}U&  
  m_Path+="\\"; 0chpC)#Q3;  
 UpdateData(FALSE); l}/&6hI+d  
} 8TP~=qU  
'` 2MxRP  
void CCaptureDlg::SaveBmp() vD?D]8.F~Q  
{ $e--"@[Y  
 CDC dc; Gau@RX:O  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); EJb+yy6  
 CBitmap bm; q5z^y(Sv  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4\*:Lc,-  
 int Height=GetSystemMetrics(SM_CYSCREEN); w\eC{,00:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /4c`[  
 CDC tdc; 4Y2I'~'  
 tdc.CreateCompatibleDC(&dc); T6=|)UTe1  
 CBitmap*pOld=tdc.SelectObject(&bm); V+@}dJS  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,Tegrz&G  
 tdc.SelectObject(pOld); y"'p#j  
 BITMAP btm; KF1iYo>p  
 bm.GetBitmap(&btm); % -AcA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; wQjYH!u,YZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #\QW <I#/  
 BITMAPINFOHEADER bih; <g;,or#$  
 bih.biBitCount=btm.bmBitsPixel; I2*(v%.-  
 bih.biClrImportant=0; {f)aFGp  
 bih.biClrUsed=0; Kl%[fjI)  
 bih.biCompression=0; wCR! bZ w  
 bih.biHeight=btm.bmHeight; ecoI-@CAI  
 bih.biPlanes=1; T#E$sZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); YGLq ~A  
 bih.biSizeImage=size; v~T)g"_|  
 bih.biWidth=btm.bmWidth; i$@xb_  
 bih.biXPelsPerMeter=0; D6&P9e_5  
 bih.biYPelsPerMeter=0; ]BjY UTNm  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); HQ" trV  
 static int filecount=0; fDplYn#  
 CString name; *ls6k`ymL  
 name.Format("pict%04d.bmp",filecount++); . !Z5A9^  
 name=m_Path+name; FA)ot)]  
 BITMAPFILEHEADER bfh; Cb?  !+U  
 bfh.bfReserved1=bfh.bfReserved2=0; h9<PP2.(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); X1a~l|$h  
 bfh.bfSize=54+size; CrL9|78  
 bfh.bfOffBits=54; '/9j"mIA9$  
 CFile bf; U:n~S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CLVT5pj='  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); gT$WG$^i  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); FK~wr;[  
  bf.WriteHuge(lpData,size); rOt{bh6r  
  bf.Close(); %7aJSuQN%  
  nCount++; T&>65`L  
 } r"h09suZBW  
 GlobalFreePtr(lpData); 24? _k]Y  
 if(nCount==1) FZ+2{wIV^  
  m_Number.Format("%d picture captured.",nCount); W,Q>3y*  
 else  aY(s &  
  m_Number.Format("%d pictures captured.",nCount); [ij) k@.  
  UpdateData(FALSE); \ moLQ  
} {nUmlP=mS  
^\Q,ACkZb  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U,v`md@PX  
{ |UWIV  
 if(pMsg -> message == WM_KEYDOWN) Kb<c||2Nh5  
 { ]1d)jWG  
  if(pMsg -> wParam == VK_ESCAPE) _BJ:GDz>  
   return TRUE; A>upT'  
  if(pMsg -> wParam == VK_RETURN) d$bO.t5CLh  
   return TRUE; P![ZO6`:W'  
 } ,e;,+w=~E  
 return CDialog::PreTranslateMessage(pMsg); Tc||96%2^  
} vnQFq  
f~a 7E;y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) P[q>;Fx*  
{ %#v$d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6wwbH}*=?  
  SaveBmp(); ~( XaXu  
  return FALSE; \EoE/2"<  
} V'W*'wo   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ro<w8V9.a  
 CMenu pop; p.g>+7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Sq_.RU  
 CMenu*pMenu=pop.GetSubMenu(0); TsoxS/MI"  
 pMenu->SetDefaultItem(ID_EXITICON); c|9g=DjK  
 CPoint pt; a]V8F&)g#  
 GetCursorPos(&pt); h~Z &L2V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zc;kNkV#1Y  
 if(id==ID_EXITICON) KO#kIM-  
  DeleteIcon(); V )oXJL  
 else if(id==ID_EXIT) f['lY1#V1  
  OnCancel(); 6c-'CW  
 return FALSE; D3dh,&KO\  
} dO1 m  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PDA9.b<q0  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) E.NfVeq  
 AddIcon(); RxJbQs$Ph  
 return res; r`6f  
} K\xM%O?  
XBCHJj]k  
void CCaptureDlg::AddIcon() r^C(|Vx  
{ y< dBF[  
 NOTIFYICONDATA data; x  zF  
 data.cbSize=sizeof(NOTIFYICONDATA); YB4 ZI  
 CString tip; OQ_< Vxz  
 tip.LoadString(IDS_ICONTIP); YQ?hAAJ  
 data.hIcon=GetIcon(0); 2(3Q#3V  
 data.hWnd=GetSafeHwnd(); YB7A5  
 strcpy(data.szTip,tip); urx?p^c  
 data.uCallbackMessage=IDM_SHELL; Khi6z&B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P}gtJ;  
 data.uID=98; vjm? X  
 Shell_NotifyIcon(NIM_ADD,&data); 2'M5+[8y8  
 ShowWindow(SW_HIDE); ,#, K_oz  
 bTray=TRUE; ?87\_wL/j  
} Vfy@?x= &  
@aUNyyVP  
void CCaptureDlg::DeleteIcon() F1$XUos9  
{ ,WOCG 2h  
 NOTIFYICONDATA data; {{P 3Z[  
 data.cbSize=sizeof(NOTIFYICONDATA); =#9#unvE!  
 data.hWnd=GetSafeHwnd(); qG 20  
 data.uID=98; } #e=*8F7  
 Shell_NotifyIcon(NIM_DELETE,&data); _^b\#Jz4U3  
 ShowWindow(SW_SHOW); }6%\/d1~ 6  
 SetForegroundWindow(); t-C|x)J+  
 ShowWindow(SW_SHOWNORMAL); ]Bf1p  
 bTray=FALSE; >E4,zs@7t  
} Y)]VlV!`  
C/N;4  
void CCaptureDlg::OnChange() [O_5`X9|  
{ wAi7jCY%OY  
 RegisterHotkey(); ATc!c +  
} uQ[,^Ee&/  
A#I&&qZ  
BOOL CCaptureDlg::RegisterHotkey() ^C^I  
{ |/l] ]+  
 UpdateData(); By7lSbj  
 UCHAR mask=0; ;7qzQ{Km  
 UCHAR key=0; 6vNn;-gg.  
 if(m_bControl) %4x0^<k~  
  mask|=4; %{r3"Q=;W  
 if(m_bAlt) g]z k`R5  
  mask|=2; lW#2ox  
 if(m_bShift) Y9#dAI[Gce  
  mask|=1; {e2ZW]  
  key=Key_Table[m_Key.GetCurSel()]; MNe/H\  
 if(bRegistered){ ZyNgG9JL]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); O_2o/  
  bRegistered=FALSE; I(BJ1 8F$  
 } wY\,b*x  
 cMask=mask; dI7rx+L  
 cKey=key; ke W7pN?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r>bgCQ#-n  
 return bRegistered; O!dS;p-F  
} _8 K|2$X  
}eZ \~2  
  四、小结 Jg'#IM  
!WlL RkwO  
  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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