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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: 9 -7.4!]I  
  ;OjxEXaq  
  一、实现方法 a(>oQG8F  
4t3Y/X  
  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: 0N02E  
D|`O8o?)  
#pragma data_seg("shareddata") !Yuu~|  
HHOOK hHook =NULL; //钩子句柄 Ubtu?wRBW  
UINT nHookCount =0; //挂接的程序数目 n^Co  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 uA#uq^3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :ryyo$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3q7Z?1'o  
static int KeyCount =0; ]z5`!e)L  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Lo"w,p`n@  
#pragma data_seg() ]ADj 9  
,S.<qmf  
  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。 $ {29[hO  
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  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: ]P lD e8  
~dkN`1$v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %mLQ'$  
cKey,UCHAR cMask) =2;2_u?  
{ -"m4 A0  
 BOOL bAdded=FALSE; 0K/?8[#  
 for(int index=0;index<MAX_KEY;index++){ alu3CE  
  if(hCallWnd[index]==0){ ?[~"$  
   hCallWnd[index]=hWnd; j*2Q{ik>J  
   HotKey[index]=cKey; pO^goo V\  
   HotKeyMask[index]=cMask; b|7c]l  
   bAdded=TRUE; %"#%/>U4  
   KeyCount++; 5\hJ&  
   break; JIeKp7;^  
  } Aj| Gqw>  
 } e)Q{yO  
 return bAdded; C*O648yz[  
} /]pBcb|<  
//删除热键 .Pz( 0Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x\/N09  
{ 3]Jl\<0  
 BOOL bRemoved=FALSE; VXr'Z  
 for(int index=0;index<MAX_KEY;index++){ (N6 3k1M  
  if(hCallWnd[index]==hWnd){ []opPQ 1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Vaj4p""\F  
    hCallWnd[index]=NULL; a~#MMl  
    HotKey[index]=0; P<&-8QA  
    HotKeyMask[index]=0; i7@qfe$fR  
    bRemoved=TRUE; cL/ 6p0S  
    KeyCount--; hEG-,   
    break; ?9jl8r>  
   } `$V7AqX(  
  } V4c$V]7  
 } >GRL5Iow  
 return bRemoved; e+Qq a4  
} Z' cQ< f  
cY&SKV#  
/{|<3CEe  
  DLL中的钩子函数如下: kVu8/*Q  
bwH l}3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G8Hj<3`  
{ Q<TD5t9  
 BOOL bProcessed=FALSE; y]1:IJL2;  
 if(HC_ACTION==nCode) TRB)cJZ?  
 { d=?Kk4Ag  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 KC@F"/h`/  
   switch(wParam) aD5jy  
   {  AGxtmBB;  
    case VK_MENU: Y\CR*om!W  
     MaskBits&=~ALTBIT; _,S L;*G4|  
     break; RL0#WBR  
    case VK_CONTROL: 014p= W  
     MaskBits&=~CTRLBIT; P<Wtv;Z1Z  
     break; hYm$Sx(=  
    case VK_SHIFT: ] qT\z<}  
     MaskBits&=~SHIFTBIT; N#C"@,}Y  
     break; eVRFb#EU0e  
    default: //judge the key and send message `jl 1Q,~2r  
     break; irqNnnMGEa  
   } cQ:Y@f 9  
   for(int index=0;index<MAX_KEY;index++){ d[h2Y/AR  
    if(hCallWnd[index]==NULL) K6vF}A|  
     continue; hqEn D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PQ}q5?N  
    { ;4E.Yr*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M$|r8%z1  
     bProcessed=TRUE; 1h.Ypz u  
    } wI\ n%#  
   } YX||\  
  } ["5Z =4  
  else if((lParam&0xc000ffff)==1){ //有键按下 k]J!E-yI8  
   switch(wParam) - v\n0Jt  
   { &4g]#A>@  
    case VK_MENU: !8cS1(a  
     MaskBits|=ALTBIT; H l'za  
     break; eRI'pi[#.  
    case VK_CONTROL: i5oV,fiZo  
     MaskBits|=CTRLBIT; :?!kZD!  
     break; u!NY@$Wc  
    case VK_SHIFT: |nfFI  
     MaskBits|=SHIFTBIT; H@!\?5I  
     break; A6?+$ Hr  
    default: //judge the key and send message a}oFL%=?  
     break; v37TDY3;  
   } L^}i7nJ  
   for(int index=0;index<MAX_KEY;index++){ xwSi}.  
    if(hCallWnd[index]==NULL) w!~%v #  
     continue; | rY.IbL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wHGiN9A+  
    { (:JX;<-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Pfy2PpA  
     bProcessed=TRUE; |AY`OVgcKD  
    } l4 @  
   } :/F=j;o  
  } }sbh|#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Eb9 eEa<W  
   for(int index=0;index<MAX_KEY;index++){ K^H{B& b8  
    if(hCallWnd[index]==NULL) =Gka;,n  
     continue; -pWnO9q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cc LTA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O$'BJKj-4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?*2DR:o>@  
   } v'x)AbbC  
  } ~Y- !PZ  
 } X\?PnD`,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8M{-RlR  
} qs96($  
XkG:1H;Q%  
  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: x,f=J4yco  
i|- 6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]n8 5.DF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xJ/<G$LNJ0  
1qEpQ.:](  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: KW3Dr`A  
`v]|x,l+C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'p%\fb6`  
{ a>3#z2#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hKZ<PwBi  
 { PrA?e{B5m  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;zMZ+GZ?;+  
  SaveBmp(); SN${cs%  
  return FALSE; [,s{/32s  
 } B=4xZJ Py  
 …… //其它处理及默认处理 Dz<"eyB\  
} _$&C$q$1y  
7P& O{tl(  
,KT[ }P7  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 K *<+K<Tp  
5_|Sm=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 4,nUCT  
V^v?;f?  
  二、编程步骤 f WUFCbSU  
z5V~m_RO  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; RDX$Wy$@L  
E%B:6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;x]CaG)f  
OMl<=;^:|  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6RA4@bIG  
*OX;ZQg0  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "@P)  
m1d*Lt>F@  
  5、 添加代码,编译运行程序。 |%V-|\GJ~j  
)<<}8Fs  
三、程序代码 e-4 Qw #cw  
jcC "S qL  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL uR;m<wPH,f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) T>$S&U  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ GKT^rc-YT-  
#if _MSC_VER > 1000 nm8XHk]  
#pragma once n7CwGN%  
#endif // _MSC_VER > 1000 ;J]Lzh  
#ifndef __AFXWIN_H__ lRy^Wp  
#error include 'stdafx.h' before including this file for PCH 2r =8&~9z  
#endif \$Jz26 -n  
#include "resource.h" // main symbols ./Y5Vk#Rp\  
class CHookApp : public CWinApp P+9%(S)L3  
{ IP#?$X  
 public: B1u.aa$  
  CHookApp(); x_X%| f  
  // Overrides [ST,/<?0  
  // ClassWizard generated virtual function overrides MBjo9P(  
  //{{AFX_VIRTUAL(CHookApp) T@{ }!  
 public: y)Y0SY1\j  
  virtual BOOL InitInstance(); q'% cVM  
  virtual int ExitInstance(); = Ff2  
  //}}AFX_VIRTUAL $G,#nh2 oD  
  //{{AFX_MSG(CHookApp) n'i~1pM,?  
  // NOTE - the ClassWizard will add and remove member functions here. 1kX>sajp~  
  // DO NOT EDIT what you see in these blocks of generated code ! ,; 81FK  
  //}}AFX_MSG bvR0?xn q  
  DECLARE_MESSAGE_MAP() {&I3qk2(  
}; 6 _Cc+}W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `S&.gPE2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UA%tI2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [f8mh88 r  
BOOL InitHotkey(); )C1ihm!7\  
BOOL UnInit(); GIs *;ps7w  
#endif gO9\pI 2  
K:<0!C!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #rps2nf.j  
#include "stdafx.h" v}>5!*  
#include "hook.h" 0v"h /  
#include <windowsx.h> [VL+X^  
#ifdef _DEBUG 5GHW~q!Zo\  
#define new DEBUG_NEW FN>ns,  
#undef THIS_FILE usFhcU  
static char THIS_FILE[] = __FILE__; 2Nau]y]=  
#endif $+%eLx*  
#define MAX_KEY 100 r ?e''r  
#define CTRLBIT 0x04 !#b8QER  
#define ALTBIT 0x02 DV6B_A{kI  
#define SHIFTBIT 0x01 0|L%)'F  
#pragma data_seg("shareddata") o&PPW~D+h@  
HHOOK hHook =NULL; c]OK)i-{l  
UINT nHookCount =0; aj\ zc I  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7hq$vI%0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT :krdG%r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey m7n8{J1O2  
static int KeyCount =0; EPn0ZwnS:M  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ra~|;( %d  
#pragma data_seg() {~=Z%Cj2Q  
HINSTANCE hins; BT3X7Cx  
void VerifyWindow(); (G#QRSXc\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s2N~p^  
//{{AFX_MSG_MAP(CHookApp) 1P '_EJ]M  
// NOTE - the ClassWizard will add and remove mapping macros here. UbDRE[^P  
// DO NOT EDIT what you see in these blocks of generated code! Q=}U  
//}}AFX_MSG_MAP Nfdh0v  
END_MESSAGE_MAP() o'hwyXy/S  
\-F F[:|J  
CHookApp::CHookApp() ky^u.+cZ  
{ {CVn&|}J  
 // TODO: add construction code here, Zf [#~4  
 // Place all significant initialization in InitInstance V9SkB3-'  
} ndB [f  
\l d{Z;e  
CHookApp theApp; C3#mmiL-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qe@ctHpn  
{ 7G 3*@cl  
 BOOL bProcessed=FALSE; y wf@G; fK  
 if(HC_ACTION==nCode) rO;Vr},3\%  
 { +j">Ju6Q;.  
  if((lParam&0xc0000000)==0xc0000000){// Key up Lfj]Y~*z  
   switch(wParam) Ic,V ,#my  
   { O>~ozW &  
    case VK_MENU: X1J'  
     MaskBits&=~ALTBIT; |."thTO  
     break; u,f$cR  
    case VK_CONTROL: 9-6E(D-ux  
     MaskBits&=~CTRLBIT; rf[w&~R  
     break; NMCMY<o  
    case VK_SHIFT: _go1gf7  
     MaskBits&=~SHIFTBIT; dK^WZQ  
     break; z}sBx 9;  
    default: //judge the key and send message 8`4Z%;1  
     break; 8<w8"B.i  
   } to%n2^^K  
   for(int index=0;index<MAX_KEY;index++){ E5EAk6  
    if(hCallWnd[index]==NULL) 2dpTU=K4  
     continue; 8`? vWJS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `~S ; UG   
    { ~,: FZ1wh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gb,X"ODq  
     bProcessed=TRUE; g5,Bj  
    } DFUW^0N  
   } qyl9#C(a  
  } /"LcW"2;N  
  else if((lParam&0xc000ffff)==1){ //Key down d0"Xlle ld  
   switch(wParam) v? VNWK2  
   { '*XX|\.  
    case VK_MENU: g,,'Pdd7Pn  
     MaskBits|=ALTBIT; $RJpn]d j  
     break; qL 0{w7  
    case VK_CONTROL: J<'7z%2w  
     MaskBits|=CTRLBIT; N-Jp; D  
     break; teDO,$  
    case VK_SHIFT: N7WQ{/PSG  
     MaskBits|=SHIFTBIT; nYF;.k  
     break; )vcyoq  
    default: //judge the key and send message tI-u@ g  
     break; l^,"^ vz  
   } W.O]f.h  
   for(int index=0;index<MAX_KEY;index++) fkjo  
   { FLE2]cL-  
    if(hCallWnd[index]==NULL) 8F#z)>q~  
     continue; /GQN34RD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JXa5snh{h  
    { LaolAqU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); S7fX1y[  
     bProcessed=TRUE; ]= EYju@  
    } @UG%B7  
   } o[ua$+67E  
  } kbHfdA  
  if(!bProcessed){ JJ=%\j  
   for(int index=0;index<MAX_KEY;index++){ 7B"*< %<  
    if(hCallWnd[index]==NULL) +uD4$Wt_F  
     continue; y))) {X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BWHH:cX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); " F3M  m  
   } ;I5u"MDHGI  
  } F#S )))#  
 } W? ^ ?Kx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2U Q&n`A  
} i;GF/pi  
%Uz 5Ve  
BOOL InitHotkey() c'gV  
{ Z<2j#rd  
 if(hHook!=NULL){ 3{j&J-  
  nHookCount++; )^^Eh=Kbj  
  return TRUE; $afE= qC*  
 } E/6@>.T?'  
 else q]qKU`m!Q`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {|Pg]#Wi&  
  if(hHook!=NULL) \F }s"#  
   nHookCount++; OlwORtWzZ  
  return (hHook!=NULL); |sIr}}  
} f#mcW L1}  
BOOL UnInit() u#c3T'E  
{ (> {CwtH][  
 if(nHookCount>1){ MkCq$MA  
  nHookCount--;  erW[q  
  return TRUE; mTsl"A>  
 } X-$\DXRIo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M ~uX!bDH  
 if(unhooked==TRUE){ ?;dfA/  
  nHookCount=0; `7))[._  
  hHook=NULL; BnL[C:|  
 } S.#IC lV  
 return unhooked; k-`5T mW  
} ZI0C%c.~  
t;?TXAA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f L}3I(VK  
{ IB sQaxt.  
 BOOL bAdded=FALSE; <:t D m  
 for(int index=0;index<MAX_KEY;index++){ b# RTHe&X  
  if(hCallWnd[index]==0){ }0 BKKU+  
   hCallWnd[index]=hWnd; -x)zyq6  
   HotKey[index]=cKey; 7Y?=ijXXx\  
   HotKeyMask[index]=cMask; 3S97hn{|=  
   bAdded=TRUE; av.L%l&d  
   KeyCount++; c@]_V  
   break; sr*3uI-)L  
  } m/`"~@}&  
 } Y9K$6lz  
 return bAdded; -S7y1 )7  
} NdlJdq  
7P!Hryy  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %v_w"2x;  
{ iLyJ7zby  
 BOOL bRemoved=FALSE; A{3?G -]*  
 for(int index=0;index<MAX_KEY;index++){ ju AUeGT  
  if(hCallWnd[index]==hWnd){ _W3>Km-A=/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -ST[!W V  
    hCallWnd[index]=NULL; Y5Ub[o  
    HotKey[index]=0; c~0hu*&  
    HotKeyMask[index]=0; r/32pY  
    bRemoved=TRUE; #RG/B2  
    KeyCount--; )0Lno|l  
    break; (1|_Nr  
   } xD#r5  
  } ;ZSJ-r  
 } 9MmAoLm  
 return bRemoved; *&m{)cTs  
} '|9fDzW"]  
rerl-T<3  
void VerifyWindow() S\F;b{S1  
{ e{~3&  
 for(int i=0;i<MAX_KEY;i++){ 0rjH`H]M  
  if(hCallWnd!=NULL){ UZ`GS$D@  
   if(!IsWindow(hCallWnd)){ +-VkRr#  
    hCallWnd=NULL; %]zaX-2dm!  
    HotKey=0; %DKQ   
    HotKeyMask=0; 5c W2  
    KeyCount--; "i}?jf {a  
   } !5/jDvh  
  } }aPx28:/  
 } FBR]) h'Z  
} 7LQLeQvB  
-j6&W`  
BOOL CHookApp::InitInstance() ZP]l%6\.  
{ <ah!!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BaLvlB  
 hins=AfxGetInstanceHandle(); RbY=O OQ  
 InitHotkey(); |@rPd=G^(/  
 return CWinApp::InitInstance(); 78iu<L+If  
} 5$(qnOi  
ncGg@$E  
int CHookApp::ExitInstance() L*rND15  
{ *gJ:irah  
 VerifyWindow(); # -0}r  
 UnInit(); }AZ0BI,TI  
 return CWinApp::ExitInstance(); aMxg6\8  
} Q1?0R<jOU  
k4:e0Wd  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file zB8 @Wl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) " ^t3VjN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u+&t"B  
#if _MSC_VER > 1000 -UHa;W H  
#pragma once @F+zME   
#endif // _MSC_VER > 1000 7u9]BhcFv?  
Nan@SuKY  
class CCaptureDlg : public CDialog %`kO\q_  
{ 7V^\fh5~  
 // Construction W!R}eLf@  
 public: ,<pk&54.@'  
  BOOL bTray; ] BJ]  
  BOOL bRegistered; ~w&_l57  
  BOOL RegisterHotkey(); 8: x{  
  UCHAR cKey; Q*W`mFul  
  UCHAR cMask; -*Voui  
  void DeleteIcon(); SnK#YQCDt  
  void AddIcon(); P|>pm]>C  
  UINT nCount; 4H<@da}  
  void SaveBmp(); 8f""@TTp  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JDQ7  
  // Dialog Data ot"3 3I  
  //{{AFX_DATA(CCaptureDlg) E3):8>R;1  
  enum { IDD = IDD_CAPTURE_DIALOG }; N3_rqRd^  
  CComboBox m_Key; ]dx6E6A,  
  BOOL m_bControl; OwdA6it^f  
  BOOL m_bAlt; B.e3IM0  
  BOOL m_bShift; 3C+!Y#F  
  CString m_Path; qqmhh_[T  
  CString m_Number; G,VTFM6  
  //}}AFX_DATA }.nHT0l  
  // ClassWizard generated virtual function overrides IQ${2Dpg[  
  //{{AFX_VIRTUAL(CCaptureDlg) Znv3h  
 public: xJQ-k/`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &2~c,] 9C  
 protected: O?6ph4'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8"fZ>XQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7Vn;LW  
  //}}AFX_VIRTUAL 'zEmg}  
  // Implementation !)Y T_ib  
 protected: O}Ipg[h  
  HICON m_hIcon; @w%{yzr%  
  // Generated message map functions @w8MOT$  
  //{{AFX_MSG(CCaptureDlg) zlUXp0W  
  virtual BOOL OnInitDialog(); n<}t\<LG^c  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1Qc>A8SU  
  afx_msg void OnPaint(); 2|LgUA?<  
  afx_msg HCURSOR OnQueryDragIcon(); x&ngCB@O  
  virtual void OnCancel(); pj~Ao+  
  afx_msg void OnAbout(); +"u6+[E  
  afx_msg void OnBrowse(); i]>)'i  
  afx_msg void OnChange(); ?)8OC(B8q  
 //}}AFX_MSG yX-h|Cr"  
 DECLARE_MESSAGE_MAP() s+EJXox w  
}; :`pgdn  
#endif 0[f8Gb3  
_a~uIGN  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &<oZl.T  
#include "stdafx.h" ([mC!d@a  
#include "Capture.h" \:'|4D]'I  
#include "CaptureDlg.h" /nbHin#we  
#include <windowsx.h> ^an3&  
#pragma comment(lib,"hook.lib") Gkc.HFn(  
#ifdef _DEBUG *dTI4k  
#define new DEBUG_NEW o7qZy |\4S  
#undef THIS_FILE ai3wSUYJi  
static char THIS_FILE[] = __FILE__; i9QL}d  
#endif w7(jSPB  
#define IDM_SHELL WM_USER+1 1x"S^j   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I6q]bQ="  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jm~qD T,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S)$)AN<O  
class CAboutDlg : public CDialog zKnHo:SV  
{ %, U@ D4w  
 public: 55mDLiA  
  CAboutDlg(); l"C)Ia&/  
  // Dialog Data m(B,a,g<  
  //{{AFX_DATA(CAboutDlg) */T.]^  
  enum { IDD = IDD_ABOUTBOX }; L\CufAN  
  //}}AFX_DATA myR}~Cj;q  
  // ClassWizard generated virtual function overrides K&\3j-8^  
  //{{AFX_VIRTUAL(CAboutDlg) =b{!p|  
 protected: W=[.. d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /C'dW  
  //}}AFX_VIRTUAL 2[O\"a%  
  // Implementation &s+F+8"P+  
 protected: B{In "R8  
  //{{AFX_MSG(CAboutDlg) &!adW@y  
  //}}AFX_MSG ;;*'<\lP.j  
  DECLARE_MESSAGE_MAP() Q>G lA  
}; /5PV|o nO  
~O;'],#Co  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f&n6;N  
{ UC u4S >  
 //{{AFX_DATA_INIT(CAboutDlg) Ah_T tj  
 //}}AFX_DATA_INIT " ,qcqG(  
} b8>2Y'X  
na%DF@Rt#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !6yyX}%o  
{ 'ot,6@~x>  
 CDialog::DoDataExchange(pDX); OYj4G ?c  
 //{{AFX_DATA_MAP(CAboutDlg) viLK\>>  
 //}}AFX_DATA_MAP Ot^<:\< `G  
} #fuc`X3:HL  
>z,SN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6F@2:]W  
 //{{AFX_MSG_MAP(CAboutDlg) {m<NPtp910  
 // No message handlers EYsf<8cl  
 //}}AFX_MSG_MAP Z7Y+rP[l  
END_MESSAGE_MAP() U#7moS'r  
';CL;A;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ? >\JX  
: CDialog(CCaptureDlg::IDD, pParent) A3!xYG=+  
{ :epjJ1mW  
 //{{AFX_DATA_INIT(CCaptureDlg) 9rCvnP=  
  m_bControl = FALSE; Dd=iYM m7  
  m_bAlt = FALSE; ITq$8  
  m_bShift = FALSE; _6"YWR  
  m_Path = _T("c:\\"); -f4>4@y  
  m_Number = _T("0 picture captured."); t$*V*gK{  
  nCount=0; hPM:=@ N$  
  bRegistered=FALSE; 0Xke26ga  
  bTray=FALSE; T VuDK  
 //}}AFX_DATA_INIT "%,KZI  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K<3$>/|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +RuPfw{z  
} |, Lp1  
a9w1Z4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) w<4,;FFlZ/  
{ Gx$rk<;ZW  
 CDialog::DoDataExchange(pDX); :.K#=ROP  
 //{{AFX_DATA_MAP(CCaptureDlg) v4YY6? 4  
  DDX_Control(pDX, IDC_KEY, m_Key); y{`aM(&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Hf ]w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (I) e-1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); '/h~O@Rw  
  DDX_Text(pDX, IDC_PATH, m_Path); nj@l5[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \N?,6;%xB  
 //}}AFX_DATA_MAP }'FNGn.~#  
} og! d  
$;ssW"7~Qn  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) */kX|Sur  
//{{AFX_MSG_MAP(CCaptureDlg) h /.^iT  
 ON_WM_SYSCOMMAND() \k8|3Y~g  
 ON_WM_PAINT() !GNLq.rQ  
 ON_WM_QUERYDRAGICON() p-6(>,+E[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Qxvj`Ge  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Yy_o*Ozq  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q,W6wM;,E  
//}}AFX_MSG_MAP LMV0:\>  
END_MESSAGE_MAP() bay7%[BLB  
HifU65"8  
BOOL CCaptureDlg::OnInitDialog() upJ|`,G{  
{ Fp`MX>F  
 CDialog::OnInitDialog(); [q MFLY$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SiM1Go}#  
 ASSERT(IDM_ABOUTBOX < 0xF000); gEE6O%]g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T.=du$  
 if (pSysMenu != NULL) jMT];%$[  
 { 0>E0}AvkT  
  CString strAboutMenu; I>]t% YKj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); r RfPq  
  if (!strAboutMenu.IsEmpty()) V&' :S{i  
  { [~ Wiy3n  
   pSysMenu->AppendMenu(MF_SEPARATOR); Rj/9\F3H  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); NW$C1(oT  
  } /eoS$q  
 } N'#Lb0`B  
 SetIcon(m_hIcon, TRUE); // Set big icon m-~eCFc  
 SetIcon(m_hIcon, FALSE); // Set small icon ,r,~1oV<"  
 m_Key.SetCurSel(0); lu GEBPi  
 RegisterHotkey(); ATeXOe  
 CMenu* pMenu=GetSystemMenu(FALSE); /R_*u4}iD  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); xTnd9'Pk`:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %Ps DS  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~okIiC]#  
 return TRUE; // return TRUE unless you set the focus to a control .?TPoqs7Z  
} `q ;79t  
pvz*(u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) a=55bEn  
{ ?|i6]y=D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I92c!`{  
 { :qx>P_&y}z  
  CAboutDlg dlgAbout; A~vZ}?*M  
  dlgAbout.DoModal(); )$#r6fQO  
 } cU y,q]PO  
 else [\hk_(}  
 { b&$ ?.z  
  CDialog::OnSysCommand(nID, lParam); xHml" Y1  
 } mGQgy[gX  
} [;c'o5M&  
h_ ^,|@C "  
void CCaptureDlg::OnPaint() CS 7"mE`{  
{ 5G~;g  
 if (IsIconic()) ~3 {C &c  
 { 5XNIX)H  
  CPaintDC dc(this); // device context for painting TtL2}Wdd.%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x8a?I T.  
  // Center icon in client rectangle h(,SAY_  
  int cxIcon = GetSystemMetrics(SM_CXICON); Co2* -[R  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~Od4( }/G  
  CRect rect; (K$K;f$"r  
  GetClientRect(&rect); nL}bCX{  
  int x = (rect.Width() - cxIcon + 1) / 2; UarU.~Uqi  
  int y = (rect.Height() - cyIcon + 1) / 2; >'i d/  
  // Draw the icon U*Z P>Vv  
  dc.DrawIcon(x, y, m_hIcon); ZQvpkO7}M  
 } ]MkZ1~f7  
 else oZ O 6J-ea  
 { hFw\uETu  
  CDialog::OnPaint(); R v9?<]  
 } Sf}>~z2  
} BoB2q(  
z_#B 4  
HCURSOR CCaptureDlg::OnQueryDragIcon() .>0e?A4,5?  
{ i0uBb%GMT  
 return (HCURSOR) m_hIcon; LxkToO{  
} %zHNX4  
&nk6_{6 c  
void CCaptureDlg::OnCancel() \#5t%t  
{ AElx #` T  
 if(bTray) SGW2'  
  DeleteIcon(); \5^#5_<  
  CDialog::OnCancel(); bz_Zk  
} w>T1D  
?@9kVB*|  
void CCaptureDlg::OnAbout() :X[(ymWNE  
{ %}cGAHV  
 CAboutDlg dlg; &I.UEF2,  
 dlg.DoModal(); ^RG6h  
} .+7GecYz  
-@%*~^~z'  
void CCaptureDlg::OnBrowse() wKhuUZj{  
{ SsDz>PP  
 CString str; $}<+~JpGfP  
 BROWSEINFO bi; (yE?)s  
 char name[MAX_PATH]; 1TfK"\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); p5^,3&  
 bi.hwndOwner=GetSafeHwnd(); ~$>l@> xX  
 bi.pszDisplayName=name; 9|dgmEd  
 bi.lpszTitle="Select folder"; |")}p=   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V\@h<%{^%7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); rX6"w31  
 if(idl==NULL) K1Nhz'^=D  
  return; (,PO(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @(PYeXdV6&  
 str.ReleaseBuffer(); xL4qt=  
 m_Path=str; $b\`N2J-_  
 if(str.GetAt(str.GetLength()-1)!='\\') $78fR8|r-  
  m_Path+="\\"; o:_}=1nh  
 UpdateData(FALSE); ^8aj\xe(  
} ?b2  
>e*m8gm#  
void CCaptureDlg::SaveBmp() .pQH>;k]K  
{ 7*y_~H  
 CDC dc; elb|=J`M0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *. l,_68  
 CBitmap bm; Ol:&cX3G  
 int Width=GetSystemMetrics(SM_CXSCREEN); K+xiov-r?  
 int Height=GetSystemMetrics(SM_CYSCREEN); :kqJ~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); aM?Xi6 U5  
 CDC tdc; = ^:TW%O  
 tdc.CreateCompatibleDC(&dc); |\2z w _o  
 CBitmap*pOld=tdc.SelectObject(&bm); X>EwJ"q#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /K2VSj3\  
 tdc.SelectObject(pOld); %d*k3 f }  
 BITMAP btm; Y$!K<c k  
 bm.GetBitmap(&btm); U .hV1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; B#AAG*Ai8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G!k&'{2  
 BITMAPINFOHEADER bih; DCM ,|FE  
 bih.biBitCount=btm.bmBitsPixel; k_#ra7zP  
 bih.biClrImportant=0; KZzOs9 s  
 bih.biClrUsed=0; {S(?E_id5b  
 bih.biCompression=0; ! lgsV..R  
 bih.biHeight=btm.bmHeight; esx<feP)\  
 bih.biPlanes=1; Jf@M>BT^A  
 bih.biSize=sizeof(BITMAPINFOHEADER); wxVf6`  
 bih.biSizeImage=size; ibex:W^  
 bih.biWidth=btm.bmWidth; $q]((@i.  
 bih.biXPelsPerMeter=0; Ev%4}GwO4  
 bih.biYPelsPerMeter=0; g !w7Yv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @26H;  
 static int filecount=0; id@!kSR  
 CString name; {o< 4 ^  
 name.Format("pict%04d.bmp",filecount++); |/C>xunzz  
 name=m_Path+name; zg2A$Fd[j  
 BITMAPFILEHEADER bfh; S9}P 5;u  
 bfh.bfReserved1=bfh.bfReserved2=0; qlD+[`=b  
 bfh.bfType=((WORD)('M'<< 8)|'B'); pa Uh+"y>  
 bfh.bfSize=54+size; P!'Sx;C^f  
 bfh.bfOffBits=54; G*uy@s:  
 CFile bf; Fh9`8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Kf2*|ZHj  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]h~=lItTRZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zz 7 m\  
  bf.WriteHuge(lpData,size); g #u1.|s&p  
  bf.Close(); +"6_rbeuO  
  nCount++; zI8Q "b  
 } ]=of=T:  
 GlobalFreePtr(lpData); RxU6.5N  
 if(nCount==1) 7g}4gX's  
  m_Number.Format("%d picture captured.",nCount); U0t/(Jyg  
 else &10vdAnBRC  
  m_Number.Format("%d pictures captured.",nCount); > n Y<J  
  UpdateData(FALSE); _%w-y(Sqn  
} Q]Q i  
P;bl+a'gu  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ZXljCiNn+\  
{ g* F?  
 if(pMsg -> message == WM_KEYDOWN) i%+cPQ^o  
 { ?Z {4iF  
  if(pMsg -> wParam == VK_ESCAPE) gN$.2+:  
   return TRUE; N[d*_KN.!  
  if(pMsg -> wParam == VK_RETURN) /cF 6{0XS9  
   return TRUE; p#hs8xz  
 } xOP%SF  
 return CDialog::PreTranslateMessage(pMsg); a_4Ny  
} =z'- B~  
^;@q^b)ZP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7S LJLn3d  
{ ' Dv `Gj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ U(3+*'8r,1  
  SaveBmp(); 8PB(<|}u  
  return FALSE; kLQPa[u4  
} &$tBD@7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W76K/A<h>  
 CMenu pop; QCQku\GLV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); e  p~3e5  
 CMenu*pMenu=pop.GetSubMenu(0); <uDEDb1|l  
 pMenu->SetDefaultItem(ID_EXITICON); _R<eWp  
 CPoint pt; eyf\j,xP&  
 GetCursorPos(&pt); zJWBovT/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2ikY.Xi6  
 if(id==ID_EXITICON) EGL1[7It`  
  DeleteIcon(); =fG c?PQ  
 else if(id==ID_EXIT) X> :@`}bq  
  OnCancel(); S%<RV6{aiM  
 return FALSE; <h:>:%#k  
} #-dfG.*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); azR<Y_tw  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8 7P{vf#  
 AddIcon(); ps=jGh[  
 return res; 8rwkux >  
} ?9xaBWf  
8 P85qa@w  
void CCaptureDlg::AddIcon() PhW< )B]  
{ eWzD'3h^  
 NOTIFYICONDATA data; q+f]E&':  
 data.cbSize=sizeof(NOTIFYICONDATA); l{F^"_U  
 CString tip; s `fIeP  
 tip.LoadString(IDS_ICONTIP); O^ZOc0<  
 data.hIcon=GetIcon(0); Q3> 3!FAO  
 data.hWnd=GetSafeHwnd(); ~L(=-B`Ow  
 strcpy(data.szTip,tip); yPrp:%PS  
 data.uCallbackMessage=IDM_SHELL; g3Q]W(F%$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; hNs970i  
 data.uID=98; p>4$&-  
 Shell_NotifyIcon(NIM_ADD,&data); c=]qUhnH  
 ShowWindow(SW_HIDE); T.O^40y  
 bTray=TRUE; rOQhS]TP*  
} ^(y=DJ7  
Ci6yH( RE  
void CCaptureDlg::DeleteIcon() <Z5ak4P  
{ e@'rY#:u  
 NOTIFYICONDATA data; m<)0 XE6w  
 data.cbSize=sizeof(NOTIFYICONDATA); H|_^T.n?E  
 data.hWnd=GetSafeHwnd(); {;0j9rr  
 data.uID=98; +;~JHx.~X  
 Shell_NotifyIcon(NIM_DELETE,&data); `3+yu' Q'  
 ShowWindow(SW_SHOW); U]j4Izq  
 SetForegroundWindow(); j~,7JJ (y  
 ShowWindow(SW_SHOWNORMAL); vRa|lGeW  
 bTray=FALSE; %^s;{aN*!  
} ModwJ w  
g+Vfd(e  
void CCaptureDlg::OnChange() 9 2_F8y*D  
{ -5,QrMM<  
 RegisterHotkey(); fy04/_,q  
} e^kccz2f  
' 7G'R  
BOOL CCaptureDlg::RegisterHotkey() ?:l3O_U 5  
{ Awl4*J~  
 UpdateData(); *KNj5>6=  
 UCHAR mask=0; o`S|  
 UCHAR key=0; <>$`vuU  
 if(m_bControl) )&:4//}a  
  mask|=4; =H6"\`W  
 if(m_bAlt) vaL+@Kq~&  
  mask|=2; (dD+?ZOO  
 if(m_bShift) #(& ! ^X3  
  mask|=1; usEd p  
  key=Key_Table[m_Key.GetCurSel()]; gQaBQq9  
 if(bRegistered){ <>/0 ;J1<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); IJHNb_Cku  
  bRegistered=FALSE; @ hH;d\W#  
 } 2[f8"'lUQ  
 cMask=mask; ?dMyhU}  
 cKey=key; z{:T~s  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P#-9{T   
 return bRegistered; y<mmv~=  
} $;NxO0$  
-q1vB8gjj  
  四、小结 ;okFm  
~]f+   
  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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