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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: ~H[  
  V$y6=Q <c  
  一、实现方法 ao4"=My*G  
!N\<QRb\q  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: R+'$V$g\X  
T&M*sydA  
#pragma data_seg("shareddata") [E9V#J89  
HHOOK hHook =NULL; //钩子句柄 kq;1Ax0 {  
UINT nHookCount =0; //挂接的程序数目 5a$Q}!6E.Y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 UDjmXQ2,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 W62 $ HI  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (IlHg^"  
static int KeyCount =0; #nK38W#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fkLI$Cl  
#pragma data_seg() C$"N)6%q  
RJpH1XQ j  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 T:v.]0l~  
4@2<dw|*h  
  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: =mVWfFL  
jZjWz1+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6`K R  
cKey,UCHAR cMask) 12 8aJ  
{ ?q^o|Y/  
 BOOL bAdded=FALSE; 4Zz%vY  
 for(int index=0;index<MAX_KEY;index++){ fL0dy[Ch@  
  if(hCallWnd[index]==0){ %bu$t,  
   hCallWnd[index]=hWnd; {e'P* j  
   HotKey[index]=cKey; F$L2bgQR?'  
   HotKeyMask[index]=cMask; mS\ gh)<h  
   bAdded=TRUE; D4@).%  
   KeyCount++; 2C6o?*RjyY  
   break; qPI\Y3ZU  
  } 0bG[pp$[  
 } gmdJ8$  
 return bAdded; /+V}.  
} mu#I F'|b  
//删除热键 M =/+q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pZE}<EX  
{ [b2KBww\  
 BOOL bRemoved=FALSE; [Rj_p&'  
 for(int index=0;index<MAX_KEY;index++){ yL2sce[  
  if(hCallWnd[index]==hWnd){ '99rXw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %bN+Y'  
    hCallWnd[index]=NULL; (Q]Ww_r~  
    HotKey[index]=0; ?-Qq\D^+  
    HotKeyMask[index]=0; ;[qA?<GJ  
    bRemoved=TRUE; 1bz%O2U-(  
    KeyCount--; ?l> <?i  
    break; u=6LPwiI  
   } VQ R E ]  
  } &@v&5EXOw  
 } [QwBSq8)  
 return bRemoved; ]$7yB3S,B  
} 5cUz^ >  
=x xN3Ay  
kTW[)  
  DLL中的钩子函数如下: ^)nIf)9}7  
C8Oh]JF4d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) B>;`$-  
{ XLgp.w;  
 BOOL bProcessed=FALSE; APJVD-  
 if(HC_ACTION==nCode) gLss2i.r  
 { c{"qrwLA  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 yC:C  
   switch(wParam) @$7'{*  
   {  Op_(10|  
    case VK_MENU: b Y2:g )  
     MaskBits&=~ALTBIT; f-BPT2U+  
     break; shZEE2Dr  
    case VK_CONTROL: g=na3^PL6  
     MaskBits&=~CTRLBIT; <~bvf A=  
     break; {9XN\v=$"*  
    case VK_SHIFT: [*K.9}+G_  
     MaskBits&=~SHIFTBIT; h( DmSW  
     break; )i^ S:2  
    default: //judge the key and send message Krd0Gc~\|  
     break; ="('  #o  
   } @@3%lr71   
   for(int index=0;index<MAX_KEY;index++){ O +u? Y  
    if(hCallWnd[index]==NULL) S }3?  
     continue; 7P bwCRg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4*&2D-8<K  
    { 'j9x(T1M1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =/ +f3  
     bProcessed=TRUE; tiPZ.a~k  
    } gX~lYdA  
   } Tl L,dPM  
  } Gm[XnUR7V  
  else if((lParam&0xc000ffff)==1){ //有键按下 nC}Y+_wo0  
   switch(wParam) Y~B-dx'V  
   { ew&"n2r  
    case VK_MENU: f~?kx41dq  
     MaskBits|=ALTBIT; ,R}9n@JI^Y  
     break; f<;eNN  
    case VK_CONTROL: P>hR${KE  
     MaskBits|=CTRLBIT; 0V+v)\4FE  
     break; 48)D%867.;  
    case VK_SHIFT: b"y4-KV  
     MaskBits|=SHIFTBIT; 7 &iav2q  
     break; hO2W!68  
    default: //judge the key and send message :{ Lihe~\  
     break; I`nC\%g  
   } PU-L,]K  
   for(int index=0;index<MAX_KEY;index++){ g~XR#vl$  
    if(hCallWnd[index]==NULL) AEd9H +I  
     continue; nP0rg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |`'WEe2  
    { _ZE&W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ud_0{%@  
     bProcessed=TRUE; M9.FtQhK/  
    } Uka(Vr:  
   } "}2I0tM  
  } U U3o (Yq  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oxug  
   for(int index=0;index<MAX_KEY;index++){  = Atyy  
    if(hCallWnd[index]==NULL) k54b@U52 h  
     continue; Lb~' I=9D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6$t+Q~2G!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r` sG!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 23X-h#w  
   } A]MX^eY  
  } aWY#gI{  
 } :464~tHI[`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jEm =A8q  
} sC_doh_M  
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  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: B.}j1 Bb  
G[]h1f!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tlgg~MViS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 71Y3.1+  
U:gvK 8n  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Q zY5S0  
(8(P12l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >6|Xvtf  
{ jpZ 7p ;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) x??H%'rP  
 { G@U}4' V9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :ay`Id_tm  
  SaveBmp(); -kb;h F}.  
  return FALSE; c1<jY~U  
 } vofBS   
 …… //其它处理及默认处理 <1<0odB  
} tcD5"ALJ  
Kc`#~-`,(  
%-an\.a.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 cRSgP{hy  
<FwAV=}6p  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 LAuaowE\v  
!!6g<S7)  
  二、编程步骤 fz%e?@>q  
Hi&bNM>?O  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; o),@I#fM  
Mlo:\ST|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; c LfPSA  
=- !B4G$  
  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; *rC%nmJwk!  
{?X9juc/#  
  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; _r`(P#Hy  
} A}Vd:#  
  5、 添加代码,编译运行程序。 |9mGX9q  
fwSI"cfM  
三、程序代码 [pz1f!Wn  
^geY Ay  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "F?p Y@4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :!fU+2$`^(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ aL/7xa  
#if _MSC_VER > 1000 >viLvDng  
#pragma once hne}G._b  
#endif // _MSC_VER > 1000 Hm_&``='  
#ifndef __AFXWIN_H__ L/,M@1@R  
#error include 'stdafx.h' before including this file for PCH jtPHk*>^wu  
#endif *-@@t+3  
#include "resource.h" // main symbols 2 '8I/>-  
class CHookApp : public CWinApp -_f-j  
{ G.qjw]Llf  
 public: sX(rJLbD  
  CHookApp(); ) Hqn  
  // Overrides WISeP\:^  
  // ClassWizard generated virtual function overrides L F!S`|FF  
  //{{AFX_VIRTUAL(CHookApp) Zc=#Y  
 public: >"D0vj  
  virtual BOOL InitInstance(); <4*)J9V^s=  
  virtual int ExitInstance(); tA-p!#V<k1  
  //}}AFX_VIRTUAL a'7RzN ,]  
  //{{AFX_MSG(CHookApp) [UB]vPXm$  
  // NOTE - the ClassWizard will add and remove member functions here. D/tFN+|P  
  // DO NOT EDIT what you see in these blocks of generated code ! bJL,pe+u  
  //}}AFX_MSG r?WOum  
  DECLARE_MESSAGE_MAP() df9$k0Fx  
}; V.w!]{xm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B`|H }KU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B{NGrC`5)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S,#UA%V"  
BOOL InitHotkey(); !H`uN  
BOOL UnInit(); uD4$<rSHb  
#endif ExSy/^4f  
y&2O)z!B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y{QF#&lW  
#include "stdafx.h" hFDo{yI  
#include "hook.h" } BnPNc[I  
#include <windowsx.h> m"~),QwF9  
#ifdef _DEBUG fUB+9G(Bx  
#define new DEBUG_NEW %F]:nk`  
#undef THIS_FILE  -to3I  
static char THIS_FILE[] = __FILE__; 7G23D  
#endif n<MreKixE  
#define MAX_KEY 100 X1GM\*BE  
#define CTRLBIT 0x04 0zXF{5Up  
#define ALTBIT 0x02 _Zbgmasb  
#define SHIFTBIT 0x01 .Yxf0y?uv  
#pragma data_seg("shareddata") a`zw5  
HHOOK hHook =NULL; {_X&{dZLX  
UINT nHookCount =0; xBAASy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey .q9i10C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T :X A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]D|Hq4ug  
static int KeyCount =0; 3 ~\S]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;r3|EA35  
#pragma data_seg() 1)ZdkTF@H  
HINSTANCE hins; :tBZu%N/N  
void VerifyWindow(); F6-U{+KU$!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Nrk/_0^  
//{{AFX_MSG_MAP(CHookApp) BY??X=  
// NOTE - the ClassWizard will add and remove mapping macros here. {&.?u1C.\  
// DO NOT EDIT what you see in these blocks of generated code! S{c;n*xf  
//}}AFX_MSG_MAP &BQ%df<y\  
END_MESSAGE_MAP() TS;?>J-  
Dhp|%_>  
CHookApp::CHookApp()  WfkP  
{ zNJ-JIo%  
 // TODO: add construction code here, BI 0 A0  
 // Place all significant initialization in InitInstance u YJL^I8M'  
} ^0T[V-PgiD  
T>pz?e^5&  
CHookApp theApp; Zcxj.F(,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V tJyE}  
{ D^\2a;[AxA  
 BOOL bProcessed=FALSE; iU a `<  
 if(HC_ACTION==nCode) ob"yz}  
 { hS +R /7  
  if((lParam&0xc0000000)==0xc0000000){// Key up xsSX~`  
   switch(wParam) ^ l9NF  
   { Q1?0 ]5  
    case VK_MENU: K^+}__;]  
     MaskBits&=~ALTBIT; dX5|A_Ex  
     break; 9U~sRj=D  
    case VK_CONTROL: bdkxCt  
     MaskBits&=~CTRLBIT; lF.yQ  
     break; T&~7*j(|e  
    case VK_SHIFT: I 6Mr[#*  
     MaskBits&=~SHIFTBIT; >PMLjXK  
     break; u3@v  
    default: //judge the key and send message _f@, >l  
     break; zV"oB9\9O  
   } k?'<f  
   for(int index=0;index<MAX_KEY;index++){ O\KSPy7YQ  
    if(hCallWnd[index]==NULL) [p[C45d=<  
     continue; y<A%&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rE&+fSBD  
    { Ig M_l=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O)Mf/P'  
     bProcessed=TRUE; N"q C-h  
    } dw]wQ\4B  
   } hCKx%&[^7  
  } zS+_6s  
  else if((lParam&0xc000ffff)==1){ //Key down  V_-{TGKX  
   switch(wParam) dT*8I0\+  
   { y:3d`E4Xw  
    case VK_MENU: EU"J'?  
     MaskBits|=ALTBIT; -*r]9f6 x  
     break; .&Ok53]b  
    case VK_CONTROL: # \)tz z  
     MaskBits|=CTRLBIT; r9d dVD  
     break; $ZOKB9QccC  
    case VK_SHIFT: p>@S61 & [  
     MaskBits|=SHIFTBIT; OnKPD=<  
     break; j |tu|Q  
    default: //judge the key and send message =!cI@TI  
     break; qm&Z_6Pw  
   } Ft)Z'&L   
   for(int index=0;index<MAX_KEY;index++) 6b8@6;&LI  
   { \O7Vo<B&D  
    if(hCallWnd[index]==NULL) K9J"Q4pEC  
     continue; njy^<7 ;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Iu -CXc  
    { 1xkU;no  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q$(0Nx<  
     bProcessed=TRUE; *!gj$GK@%  
    } X}5aE4K/  
   } b:iZ.I  
  } Q:x:k+O-  
  if(!bProcessed){ &z\]A,=T c  
   for(int index=0;index<MAX_KEY;index++){ yT>t[t60/S  
    if(hCallWnd[index]==NULL) v0dFP0.;&  
     continue; O&:0mpRZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N&0MA  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Bn"r;pqWiT  
   } #dLp<l)  
  } r $du-U  
 } #c0 dZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hao0_9q+  
} r]{fjw(~  
I@=h|GM  
BOOL InitHotkey() axY-Vj  
{ MGO.dRy_  
 if(hHook!=NULL){ LC/w".oq?  
  nHookCount++; 3_atv'I  
  return TRUE; ."Yub];H  
 } fJ Ch  
 else L-d8bA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0;)6ZU  
  if(hHook!=NULL) 7[-jr;v  
   nHookCount++; 0<L@f=i  
  return (hHook!=NULL); S iw9_c  
} tji,by#E/%  
BOOL UnInit() cLl fncI  
{  W4CI=94  
 if(nHookCount>1){ (nrrzOax  
  nHookCount--; {K'SOh H4?  
  return TRUE; kXC.rgal  
 } 'w%N(Ntq  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !9"R4~4  
 if(unhooked==TRUE){ q rbF@{  
  nHookCount=0; g]xZ^M+  
  hHook=NULL; t%z7#}9$  
 } ud:?~?j&w  
 return unhooked; 1TQ $(bI  
} tL+8nTL  
[Pp#l*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =zA=D.D2  
{ H>XbqIkL@  
 BOOL bAdded=FALSE; QBsDO].J<  
 for(int index=0;index<MAX_KEY;index++){ Xs?7Whc6  
  if(hCallWnd[index]==0){ f9- |! ]s  
   hCallWnd[index]=hWnd; >KY\Bx  
   HotKey[index]=cKey; xN"KSQpu  
   HotKeyMask[index]=cMask; <vt^=QA'  
   bAdded=TRUE; 0K3FH&.%  
   KeyCount++; 3}:pD]`h  
   break; J#V `W&\,6  
  } K[sM)_I  
 } T %a]3  
 return bAdded; c0G/irK  
} jZ D\u%  
iKabo,~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bOz\-=au  
{  ,O~2 R  
 BOOL bRemoved=FALSE; ,IJNuu\  
 for(int index=0;index<MAX_KEY;index++){ j [U0,]  
  if(hCallWnd[index]==hWnd){ ^LU[{HZV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @$+[IiP  
    hCallWnd[index]=NULL; 1M;)$m:  
    HotKey[index]=0; :s'%IGy>:  
    HotKeyMask[index]=0; O[L8(+Sn  
    bRemoved=TRUE; ;5|EpoM  
    KeyCount--; 78QFaN$  
    break; =-VV`  
   } $GO'L2oLwn  
  } fBLd5  
 } PRz oLzr  
 return bRemoved; GC\/B0!  
} kN$70N7I;  
QNJG}Upl  
void VerifyWindow() ?@#}%<yEq  
{ UUU^YT \  
 for(int i=0;i<MAX_KEY;i++){ .4Ny4CMHZ  
  if(hCallWnd!=NULL){ | fI%L9  
   if(!IsWindow(hCallWnd)){ wwAT@=X*}  
    hCallWnd=NULL; .E}});l  
    HotKey=0; }1W$9\%  
    HotKeyMask=0; rka:.#!  
    KeyCount--; K`X2N  
   } 2>!ykUw^O  
  } kxmS   
 } sR 9F:  
} ~JNuy"8  
F:@Ixk?E  
BOOL CHookApp::InitInstance() VxFy[rP  
{ P8VU&b\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xKr,XZu  
 hins=AfxGetInstanceHandle(); c'B"Onu@m*  
 InitHotkey(); ( 7?%Hg  
 return CWinApp::InitInstance(); f lB,_  
} _Nn!SE   
u .2sB6}  
int CHookApp::ExitInstance() u7=[~l&L  
{ 0c5_L6_z  
 VerifyWindow(); H+;wnI>@  
 UnInit(); *02( J  
 return CWinApp::ExitInstance(); cMl%)j-  
} 1pb;A;F,A  
}SV3PdE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y2X1!Em>B  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) QB[s8"S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QC4T=E]` j  
#if _MSC_VER > 1000 Z~(XyaN  
#pragma once ~qS/90,  
#endif // _MSC_VER > 1000 c Vn+~m_%  
[!&k?.*;<  
class CCaptureDlg : public CDialog pNlisS  
{ >y9o&D  
 // Construction aHC;p=RQ\A  
 public: ?i~/gjp  
  BOOL bTray; f4S@lyYF  
  BOOL bRegistered; nEm7&Gb  
  BOOL RegisterHotkey(); `&_k\/  
  UCHAR cKey; kkBU<L2  
  UCHAR cMask; %5*#c*)R  
  void DeleteIcon(); ;n!X% S<z*  
  void AddIcon(); winJ@IYW  
  UINT nCount; Z]TVH8%|k  
  void SaveBmp(); dCP Tpm  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r$FM8$cJ  
  // Dialog Data (u&yb!`  
  //{{AFX_DATA(CCaptureDlg) O{#Cddt:r  
  enum { IDD = IDD_CAPTURE_DIALOG }; mzB#O;3=  
  CComboBox m_Key; kA<r:/  
  BOOL m_bControl; iwJ-<v_:h  
  BOOL m_bAlt; %_MR.J+m2  
  BOOL m_bShift; 3Z:!o$  
  CString m_Path; &H1D!N  
  CString m_Number; THgzT\_zq  
  //}}AFX_DATA W lQ=CRY  
  // ClassWizard generated virtual function overrides f_h"gZWV  
  //{{AFX_VIRTUAL(CCaptureDlg) Gu`Vk/&  
 public: hS{ *l9v7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +Z&&H'xD  
 protected: P .4b+9T x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G=!bM(]R~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [y[v]'  
  //}}AFX_VIRTUAL bNjaCK<  
  // Implementation @\`G & VB  
 protected: X,EYa>RSy_  
  HICON m_hIcon; J s<MJ4r>/  
  // Generated message map functions G\>\VA  
  //{{AFX_MSG(CCaptureDlg) JJ9e{~0 I  
  virtual BOOL OnInitDialog(); ENXW#{N.v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zg Y*|{4Sl  
  afx_msg void OnPaint(); 1X"H6j[w  
  afx_msg HCURSOR OnQueryDragIcon(); a^\- }4yR  
  virtual void OnCancel(); 8pL>wL &C  
  afx_msg void OnAbout(); mGpkM?Y"  
  afx_msg void OnBrowse(); HvgK_'  
  afx_msg void OnChange(); W[X!P)=w]  
 //}}AFX_MSG Hrg=sR  
 DECLARE_MESSAGE_MAP() -?w v}o  
}; TQ\wHJ  
#endif v(@+6#&  
zGL<m0C  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b8{h[YJL2  
#include "stdafx.h" 3@TG.)N4  
#include "Capture.h" G<u.+V  
#include "CaptureDlg.h" n?e@):  
#include <windowsx.h> jU4)zN/`r  
#pragma comment(lib,"hook.lib") ghobu}wuF  
#ifdef _DEBUG ??zABV  
#define new DEBUG_NEW \|pK Z6*s  
#undef THIS_FILE 9u7n/o&8v6  
static char THIS_FILE[] = __FILE__; }Cmj(k`~  
#endif !: EW21m  
#define IDM_SHELL WM_USER+1 bV )PT`-,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^=izqh5S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cfC;eRgq~  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PD}SPOA`U3  
class CAboutDlg : public CDialog _]=TFz2O  
{ t.>te'DK/  
 public: N1+4bR  
  CAboutDlg(); ."F'5eTT~  
  // Dialog Data ,Og[[0g  
  //{{AFX_DATA(CAboutDlg) *3F /Ft5  
  enum { IDD = IDD_ABOUTBOX }; B'KXQa-$O  
  //}}AFX_DATA liCCc;&B;  
  // ClassWizard generated virtual function overrides CFkW@\]  
  //{{AFX_VIRTUAL(CAboutDlg) N.5KPAvg%  
 protected: @wEKCn|}o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XC7Ty'#"KX  
  //}}AFX_VIRTUAL ^T}}4I_Y  
  // Implementation +;:aG6q+  
 protected: ~.4W,QLuD  
  //{{AFX_MSG(CAboutDlg) j h1bn  
  //}}AFX_MSG *@ <8&M9x  
  DECLARE_MESSAGE_MAP() +B`'P9Zk@  
}; RFZU}.*K$  
0gv3v@QO  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RWh9&O:6'  
{ + 4V1>e+  
 //{{AFX_DATA_INIT(CAboutDlg) ;l/}Or2  
 //}}AFX_DATA_INIT @pqY9_:P1  
} Y-Ziyy  
^ Hz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !7mvyc!'!  
{ ]/ZA/:Oa+  
 CDialog::DoDataExchange(pDX); #51 4a(6  
 //{{AFX_DATA_MAP(CAboutDlg) HsjELbH  
 //}}AFX_DATA_MAP RI[7M (  
} PmPyb>HK=P  
HO%E-5b9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2d5}`>  
 //{{AFX_MSG_MAP(CAboutDlg) R "/xne  
 // No message handlers pW*{Mx  
 //}}AFX_MSG_MAP ~8H&m,{j  
END_MESSAGE_MAP() m0x J05Zx  
>G-8FL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Eu`2w%qz  
: CDialog(CCaptureDlg::IDD, pParent) 2y9:'c|  
{ T@K7DkP@  
 //{{AFX_DATA_INIT(CCaptureDlg) w|!YoMk+o  
  m_bControl = FALSE; nV!2Dfd  
  m_bAlt = FALSE; Xk{!' 0  
  m_bShift = FALSE;  D rF  
  m_Path = _T("c:\\"); PtVo7zO ye  
  m_Number = _T("0 picture captured."); 86;+r'3p.  
  nCount=0; G*P[z'K=  
  bRegistered=FALSE; u#a%(  
  bTray=FALSE; A0cM(w{7_  
 //}}AFX_DATA_INIT 936Ff*%(l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4c5^7";P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); avu*>SB  
} Ij;==f~G  
x !#Ma  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @!z$Sp=  
{ 88Fb1!a5Z  
 CDialog::DoDataExchange(pDX); S+.21,  
 //{{AFX_DATA_MAP(CCaptureDlg) ri/t(m^{W  
  DDX_Control(pDX, IDC_KEY, m_Key); w8AJ#9W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); pchQ#GU  
  DDX_Check(pDX, IDC_ALT, m_bAlt); io1S9a(y  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bn0"M+7)f  
  DDX_Text(pDX, IDC_PATH, m_Path); B,~f "  
  DDX_Text(pDX, IDC_NUMBER, m_Number); MxM]( ew~7  
 //}}AFX_DATA_MAP 8fJR{jD(s  
} TqENaC#&  
D+| K%_Qq  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G*kE~s9R  
//{{AFX_MSG_MAP(CCaptureDlg) =]=B}L `  
 ON_WM_SYSCOMMAND() "-G&=(  
 ON_WM_PAINT() ljN zYg~-  
 ON_WM_QUERYDRAGICON() *0=fT}&!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Nc G,0K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R^jlEt\&P  
 ON_BN_CLICKED(ID_CHANGE, OnChange) GwgFi@itN  
//}}AFX_MSG_MAP k-{yu8*';  
END_MESSAGE_MAP() 2-B6IPeI  
.yZK.[x4  
BOOL CCaptureDlg::OnInitDialog() l\K%  
{ Cr' ! "F  
 CDialog::OnInitDialog(); kR<xtHW  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NY4!TOp  
 ASSERT(IDM_ABOUTBOX < 0xF000); (3e;"'k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WuBmdjZ  
 if (pSysMenu != NULL) !a' K &  
 { IkSX\*  
  CString strAboutMenu; e{v,x1Y_z(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L@7Qs6G2u  
  if (!strAboutMenu.IsEmpty()) gb.f%rlZ`  
  { Q{H17]W  
   pSysMenu->AppendMenu(MF_SEPARATOR); wY' "ab  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M%7`8KQ  
  } /yLzDCKn  
 } aXRv}WO$>k  
 SetIcon(m_hIcon, TRUE); // Set big icon +n@f'a">  
 SetIcon(m_hIcon, FALSE); // Set small icon JzHqNUn*M  
 m_Key.SetCurSel(0); Z1VC5* K  
 RegisterHotkey(); " <<A  
 CMenu* pMenu=GetSystemMenu(FALSE); 7sj<|g<h(_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U5|B9%:&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G1kDM.L  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); MB1sQReOO  
 return TRUE; // return TRUE unless you set the focus to a control 4O$mR  
}  pgC d  
A ?#]s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) # .~ga7Q  
{ 6a7vlo  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [m~b[ZwES  
 { >NJjS8f5  
  CAboutDlg dlgAbout; \s,Iz[0Vfz  
  dlgAbout.DoModal(); 7@FDBjq  
 } Kp8fh-4_  
 else R78!x*U}  
 { 3 t/ R2M  
  CDialog::OnSysCommand(nID, lParam); KA`0g=  
 } [}{w  
} I!61 K  
)X7e$<SU*  
void CCaptureDlg::OnPaint() :M@Mmp Ph  
{ 6 4?Pfir6  
 if (IsIconic()) U?^OD  
 { lco~X DI  
  CPaintDC dc(this); // device context for painting ^SEc./$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ])eOa%  
  // Center icon in client rectangle U9x4j_.q  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9H>BWjS  
  int cyIcon = GetSystemMetrics(SM_CYICON); g8KY`MBnC&  
  CRect rect; ,g%o  
  GetClientRect(&rect);  GaHA%  
  int x = (rect.Width() - cxIcon + 1) / 2; K*[9j 0  
  int y = (rect.Height() - cyIcon + 1) / 2; l(gJLjTH%  
  // Draw the icon Ah*wQow  
  dc.DrawIcon(x, y, m_hIcon); B#1:Y;Z  
 } %Nl`~Kz9U  
 else zkd3Z$Ce  
 { )^&,Dj   
  CDialog::OnPaint(); DTPay1]6  
 } ~ eHRlXL'  
} &D]&UQf  
Yhe+u\vGs\  
HCURSOR CCaptureDlg::OnQueryDragIcon() %Mh Q  
{ yji>*XG  
 return (HCURSOR) m_hIcon; ) 9MrdVNv  
} F,Q?s9s  
 QGXQ{  
void CCaptureDlg::OnCancel() J,RDTXqn  
{ \<X2ns@Tf  
 if(bTray) GYd]5`ri  
  DeleteIcon(); WK*S4c  
  CDialog::OnCancel(); YwGH G{?e  
} 8`*`nQhWa  
0potz]}  
void CCaptureDlg::OnAbout() Gbn4 *<N  
{ ,7<DGI_y  
 CAboutDlg dlg; U_l7CCK +  
 dlg.DoModal(); zFywC-my@  
} |:N>8%@6c  
~H u"yAR  
void CCaptureDlg::OnBrowse() +qhnP$vIe  
{ Y87XLvig}  
 CString str; Ssf+b!e]  
 BROWSEINFO bi; }"n7~|  
 char name[MAX_PATH]; PyFj@n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); h8jB=e, H  
 bi.hwndOwner=GetSafeHwnd(); -TTs.O8P|<  
 bi.pszDisplayName=name; mB`D}g$  
 bi.lpszTitle="Select folder"; )&,K94  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tFiR!f)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (i]Z|@|)  
 if(idl==NULL) ?Wa<AFXQ  
  return; L,$3Yj  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #uKWuGz]  
 str.ReleaseBuffer(); csDQva\  
 m_Path=str; ybE[B}pOeZ  
 if(str.GetAt(str.GetLength()-1)!='\\') '_ 0  
  m_Path+="\\"; k;Hnu  
 UpdateData(FALSE); Vo M6  
} B.*"Xfr8  
Y@%`ZPJ  
void CCaptureDlg::SaveBmp() c+2sT3).D  
{ +/y]h 0aa  
 CDC dc; ,{8v4b-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5g>wV  
 CBitmap bm; yFjVKp'P  
 int Width=GetSystemMetrics(SM_CXSCREEN); +s~.A_7)  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7@l<? (  
 bm.CreateCompatibleBitmap(&dc,Width,Height); smup,RNZRX  
 CDC tdc; !Lkm? (_  
 tdc.CreateCompatibleDC(&dc); 8+&JQ"UaB  
 CBitmap*pOld=tdc.SelectObject(&bm); 6/1$< !WH  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {/|qjkT&W  
 tdc.SelectObject(pOld); *_"u)<J  
 BITMAP btm; :1;Q(9:v  
 bm.GetBitmap(&btm); Q7GY3X*kA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K5`Rk" s  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 10O$'`  
 BITMAPINFOHEADER bih; )yj:PY]  
 bih.biBitCount=btm.bmBitsPixel; }C,O   
 bih.biClrImportant=0; m@\ZHbq  
 bih.biClrUsed=0; .~mCXz<x  
 bih.biCompression=0; f Iy]/  
 bih.biHeight=btm.bmHeight; hs(W;tR@W  
 bih.biPlanes=1; |" 7 Y52d  
 bih.biSize=sizeof(BITMAPINFOHEADER); _|zBUrN  
 bih.biSizeImage=size; :(p )1=I  
 bih.biWidth=btm.bmWidth; u #~ ;&D*q  
 bih.biXPelsPerMeter=0; XUS vhr$|  
 bih.biYPelsPerMeter=0; R#eg^7HfX  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4l @)K9F  
 static int filecount=0; :2y"3azxk  
 CString name; /k6fLn2;  
 name.Format("pict%04d.bmp",filecount++); ,}J_:\j  
 name=m_Path+name; XUmR{A  
 BITMAPFILEHEADER bfh; /3B6 Mtb  
 bfh.bfReserved1=bfh.bfReserved2=0; b$- e\XB!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o#D.9K(  
 bfh.bfSize=54+size; GEe`ZhG,  
 bfh.bfOffBits=54; z$[C#5+2  
 CFile bf; T ):SGW  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ r;gP}H ?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); FWY2s(5p  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #YK5WTn5  
  bf.WriteHuge(lpData,size); rU2iy"L  
  bf.Close(); <Kt3PyF  
  nCount++; J4aB Pq`  
 } uaw <  
 GlobalFreePtr(lpData); aGoE,5  
 if(nCount==1) R_kQPP  
  m_Number.Format("%d picture captured.",nCount); Q8qz*v]{  
 else IL!=mZ>2O  
  m_Number.Format("%d pictures captured.",nCount); jbmTmh1q  
  UpdateData(FALSE); B0Xl+JIR#  
} cQUC.TZ_  
!; v~^#M]~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K@:m/Z}|4  
{ q/gB<p9  
 if(pMsg -> message == WM_KEYDOWN) ra6o>lI(,  
 { 5#2 F1NX  
  if(pMsg -> wParam == VK_ESCAPE) {nMAm/kyj  
   return TRUE; |qN'P}L  
  if(pMsg -> wParam == VK_RETURN) q4 k@l  
   return TRUE; 0 P|&Pq&IH  
 } K_BPZ5w  
 return CDialog::PreTranslateMessage(pMsg); 7;}l\VXHm  
} L;6.r3bL  
TMVryb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D'[Uc6  
{ SpSnoVI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M>H=z#C>/A  
  SaveBmp(); s8gU7pT49  
  return FALSE; T-" I9kM  
} qE7R4>5xjO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x"4%(xBu  
 CMenu pop; =Agg_h   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B]iP't \~  
 CMenu*pMenu=pop.GetSubMenu(0); UlovXb  
 pMenu->SetDefaultItem(ID_EXITICON); RW7(r/C  
 CPoint pt; nCxAQ|P?  
 GetCursorPos(&pt); Q(@IK&v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `,Vv["^PB  
 if(id==ID_EXITICON) /Z%>ArAx  
  DeleteIcon(); XhW %,/<  
 else if(id==ID_EXIT) m <k!^jp  
  OnCancel(); \gO,hST   
 return FALSE; {rH9grb  
} *~VxC{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); E;(Rm>lB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A.%CAGU5w  
 AddIcon(); vK'?:}~  
 return res; % 4 ~l  
} nKh&-E   
lC?Icn|o  
void CCaptureDlg::AddIcon() /!&R9!6 :  
{ ~Pf5ORoe  
 NOTIFYICONDATA data; g@v s*xE  
 data.cbSize=sizeof(NOTIFYICONDATA);  z01>'  
 CString tip; d]v+mVAyE  
 tip.LoadString(IDS_ICONTIP); MXh "Y*}  
 data.hIcon=GetIcon(0); `iG,H[t+j  
 data.hWnd=GetSafeHwnd(); &*,:1=p  
 strcpy(data.szTip,tip); (M-ZQ -  
 data.uCallbackMessage=IDM_SHELL; %b!-~ Y.  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; '3(l-nPiG^  
 data.uID=98; Sr.;GS5i  
 Shell_NotifyIcon(NIM_ADD,&data); C;B}3g&  
 ShowWindow(SW_HIDE); 9uB(Mx(-:`  
 bTray=TRUE; JWO=!^  
} !dcwq;Ea  
quu*xJ;Ci  
void CCaptureDlg::DeleteIcon() x%> e)L<  
{ ZU2laqa_  
 NOTIFYICONDATA data; jx`QB')kX  
 data.cbSize=sizeof(NOTIFYICONDATA); Kp iF0K  
 data.hWnd=GetSafeHwnd(); bha?eN  
 data.uID=98; # '|'r+  
 Shell_NotifyIcon(NIM_DELETE,&data); YoODR  
 ShowWindow(SW_SHOW); Vd9@Dy  
 SetForegroundWindow(); T3&`<%,f  
 ShowWindow(SW_SHOWNORMAL); &Vk; VM`5  
 bTray=FALSE; 'Pltn{iq[  
} R!x: C!{  
q }C+tn"\  
void CCaptureDlg::OnChange() 72db[  
{ T5lQIr@a  
 RegisterHotkey(); &~sfYW  
} ^(x^6d  
`(4pu6uT  
BOOL CCaptureDlg::RegisterHotkey() BNGe exs@  
{ -7-['fX  
 UpdateData(); |01?w|  
 UCHAR mask=0; n]CbDbNw7)  
 UCHAR key=0; 7YIK9edP  
 if(m_bControl) ?[)S7\rP  
  mask|=4; do/)~9[4\  
 if(m_bAlt) $6f\uuTU2"  
  mask|=2; dx_6X!=.J  
 if(m_bShift) nY?  
  mask|=1; f>Td)s1 M  
  key=Key_Table[m_Key.GetCurSel()]; m@xi0t  
 if(bRegistered){ [pOg'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); n(Y%Vmy  
  bRegistered=FALSE; }2>"<)  
 } ak:v3cQR  
 cMask=mask; !%L,* '  
 cKey=key; y7u^zH6wj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); > R^@Ww;|q  
 return bRegistered; MLVB^<qkeH  
} j#A%q"]8  
]5CNk+`'  
  四、小结 *e.*=$  
;]D(33) (  
  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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