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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: eo*u(@  
  w]Ko/;;^2  
  一、实现方法 CX ]\Q-y  
*v nxP9<  
  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: 5ih"Nds[H  
@+\S!o3m  
#pragma data_seg("shareddata") c<h!QnJ  
HHOOK hHook =NULL; //钩子句柄 ic0v*Y$  
UINT nHookCount =0; //挂接的程序数目 'f?&EsIV?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 n@07$lY@;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?y*+^E0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _[{:!?-?  
static int KeyCount =0; D"x$^6`c}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 PZ!dn%4jy  
#pragma data_seg() DYT -#Ht  
N{hF [F  
  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。 qzH qj;  
Z?~d']XD  
  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: 9"HmHy&:E  
C>:/(O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Yf!*OGF  
cKey,UCHAR cMask) wSJ]3gJM`  
{ l\=-+'Y  
 BOOL bAdded=FALSE; SA(UD   
 for(int index=0;index<MAX_KEY;index++){ Nr]8P/[~  
  if(hCallWnd[index]==0){ pe!dm}!h[  
   hCallWnd[index]=hWnd; L'\/)!cEd  
   HotKey[index]=cKey; rZ!Yi*? f  
   HotKeyMask[index]=cMask; uFm+Y]h  
   bAdded=TRUE; gP %|:"  
   KeyCount++; ,\S pjE  
   break; o/dMm:TF  
  } K{ zCp6  
 } aW=By)S!Y  
 return bAdded; J~iOP  
} 4#@W;'  
//删除热键 |ilv|UV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oTF^<I-C  
{ uO ?Od  
 BOOL bRemoved=FALSE; Gq0]m  
 for(int index=0;index<MAX_KEY;index++){ $*AC>i\  
  if(hCallWnd[index]==hWnd){ wUK7um  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eC>"my`  
    hCallWnd[index]=NULL; y^mWG1"O  
    HotKey[index]=0; 9@#h}E1$  
    HotKeyMask[index]=0; X!7VyE+n  
    bRemoved=TRUE; /B,:<&_-  
    KeyCount--; 4-7kS85  
    break; uq!;  
   } 6WE&((r ^  
  } $N}/1R^?r  
 } 6%gB E  
 return bRemoved; jFuC=6aF  
} SUH mBo"}  
4AY _#f5u  
{J,6iP{>ZN  
  DLL中的钩子函数如下: ex` xkZ+  
xl+DRPzl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0$eyT-:d  
{ [ME}Cv`?<E  
 BOOL bProcessed=FALSE; XJx,9trH  
 if(HC_ACTION==nCode) L@{!r=%_>  
 {  ?YqJ.F;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 QU^/[75Ea0  
   switch(wParam) u(pdP"  
   {  |Z`M*.d+  
    case VK_MENU: I?_E,.)[ I  
     MaskBits&=~ALTBIT; Xh.+pJl,*  
     break; [_y9"MMwn  
    case VK_CONTROL: PUbaS{J7  
     MaskBits&=~CTRLBIT; 8{R_6BS  
     break; yWj9EHQU[  
    case VK_SHIFT: Dh2:2Rz=#7  
     MaskBits&=~SHIFTBIT; i(Ip(n  
     break; UF@IBb}0  
    default: //judge the key and send message I2TD.wuIW  
     break; ![^EsgEB*  
   } )46 0 Ed  
   for(int index=0;index<MAX_KEY;index++){ #|qm!aGs  
    if(hCallWnd[index]==NULL) cu[!D}tVU  
     continue; P3'2IzNw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jja{*PZ6H  
    { `kv1@aQPL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M'yO+bu  
     bProcessed=TRUE; ^9&b+u=X  
    } )-=2w-ZX  
   } CN$I:o04C  
  } (# JMB)  
  else if((lParam&0xc000ffff)==1){ //有键按下  ?qk@cKS  
   switch(wParam) l iw,O 6  
   { mO#I nTO  
    case VK_MENU: >&bv\R/  
     MaskBits|=ALTBIT; p1+7 <Y:  
     break; aK]7vp+  
    case VK_CONTROL:  cp$.,V  
     MaskBits|=CTRLBIT; zQ,f5x  
     break; ,{?wKXJ}L!  
    case VK_SHIFT: HtxLMzgz<<  
     MaskBits|=SHIFTBIT; h ~ $&  
     break;  AlO,o[0  
    default: //judge the key and send message 3 h#s([uL  
     break; '<TD6jBs  
   } Hw Z^D= A  
   for(int index=0;index<MAX_KEY;index++){ 0z/h+,  
    if(hCallWnd[index]==NULL) g;8M<`qvf  
     continue; UmJUt|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zp`~}LV{  
    { PNf&@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +4Q[N;[+*  
     bProcessed=TRUE; XTV0Le\f  
    } B$ui:R/ t  
   } ;TtaH  
  } XJUEwX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 b7bSTFZxC  
   for(int index=0;index<MAX_KEY;index++){ bZ/ hgqS  
    if(hCallWnd[index]==NULL) h0|[etaf  
     continue; qmEoqU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z OtkC3hY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f3 !n$lj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 h6g:(3t6m  
   } L/BHexOB  
  } !}ilN 1>  
 } {gsW(T>)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `mrCu>7  
} |"Z-7@/k$i  
D ZVXz|g  
  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: 3)Zu[c[%'J  
Vb2\/e:k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZW>o5x__b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4Q;<Q"  
Lx%:t YZ  
  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: HcA[QBh  
#pX8{Tf[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v;Es^ YI  
{ WHP;Neb6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RK-x?ZYH'  
 { !3h{lE B  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Je^Y&a~  
  SaveBmp(); vevf[eO-  
  return FALSE; 4f!dY o4L  
 } N+NK`  
 …… //其它处理及默认处理 BhLZ7*  
} ^#;RLSv   
 //<:k8  
N`HSE=u>  
  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。  DwXU  
pw3 (t  
  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。 S;8.yj-  
6}ftBmv  
  二、编程步骤  ;1@C_5C  
';6X!KY+]  
  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"; q[P~L`h S  
-KiRj!v|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; EL7T'zJ$  
2 5Q+1  
  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; @V$I?iXV  
&$F[/[Ds+  
  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; 3p_b8K_bG  
@bT3'K-4  
  5、 添加代码,编译运行程序。 dQ<(lzS~  
g5}lLKT  
三、程序代码 ]YsR E>  
T`?n,'!(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @^!\d#/M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \!<"7=(J{4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b/nOdFO@  
#if _MSC_VER > 1000 Q2"WV  
#pragma once gLD{1-v  
#endif // _MSC_VER > 1000 f*<ps o  
#ifndef __AFXWIN_H__ !!WJn}  
#error include 'stdafx.h' before including this file for PCH c;wA  
#endif MqdB\OW&  
#include "resource.h" // main symbols -2 x E#r  
class CHookApp : public CWinApp &DLhb90  
{ ~ M*gsW$  
 public: 1"O&40l  
  CHookApp(); 4)^vMG&  
  // Overrides RL*]g*  
  // ClassWizard generated virtual function overrides TT7PQf >  
  //{{AFX_VIRTUAL(CHookApp)  P?J kP  
 public: /PqUXF  
  virtual BOOL InitInstance(); :G 5C ]'t  
  virtual int ExitInstance(); +i=p5d5  
  //}}AFX_VIRTUAL C8.W5P[U  
  //{{AFX_MSG(CHookApp) e!Br>^8l  
  // NOTE - the ClassWizard will add and remove member functions here. JT)k  
  // DO NOT EDIT what you see in these blocks of generated code ! :!O><eQw  
  //}}AFX_MSG pds*2p)2  
  DECLARE_MESSAGE_MAP() 3]^'  
}; <Oa9oM},d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Nd!c2`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r?^"6 5 =  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2r;GcjezH  
BOOL InitHotkey(); 6vobta^w  
BOOL UnInit(); \Yq0 zVol  
#endif "0-y*1/m  
qlUzr.^-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 76u{!\Jo/{  
#include "stdafx.h" FJwt?3\u5  
#include "hook.h" 7`fY*O6   
#include <windowsx.h> Dtt-|_EMS  
#ifdef _DEBUG X *O9JGh  
#define new DEBUG_NEW N09KVz2Q  
#undef THIS_FILE =dGKF`tR  
static char THIS_FILE[] = __FILE__; -:S IS`0s  
#endif El (/em  
#define MAX_KEY 100 8l23%iWxe  
#define CTRLBIT 0x04 JZ=5Bpw  
#define ALTBIT 0x02 {ma;G[!  
#define SHIFTBIT 0x01 GV8)Kor%  
#pragma data_seg("shareddata") kA^A mfba  
HHOOK hHook =NULL; a,n93-m(m  
UINT nHookCount =0; jNc<~{/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m}5q]N";x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^|?1_r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )gXTRkmw  
static int KeyCount =0; 4AHL3@x  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C:GvP>  
#pragma data_seg() Y<Q\d[3^F  
HINSTANCE hins; M#a&\cqC  
void VerifyWindow(); YPszk5hn  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) UX_I6_&  
//{{AFX_MSG_MAP(CHookApp) 3LW[H+k  
// NOTE - the ClassWizard will add and remove mapping macros here. _7@z_i_c  
// DO NOT EDIT what you see in these blocks of generated code! }V]eg,.BJ  
//}}AFX_MSG_MAP hYb9`0G"2  
END_MESSAGE_MAP() S$O,] @)  
uV~e|X "9s  
CHookApp::CHookApp() gs`> C(  
{ a+?~;.i~  
 // TODO: add construction code here,  Oh`2tc-  
 // Place all significant initialization in InitInstance R0<< f]  
} <xn;bp[  
HC7JMj  
CHookApp theApp; ez*jjm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -3hCiKq  
{ GDPo`# ~  
 BOOL bProcessed=FALSE; \!H{Ks{#R.  
 if(HC_ACTION==nCode) g:gB`8w?  
 { {$fsS&aPg  
  if((lParam&0xc0000000)==0xc0000000){// Key up QIV%6q+*R  
   switch(wParam) >;nS8{2o  
   { HomN/wKh  
    case VK_MENU: C5n?0I9  
     MaskBits&=~ALTBIT; xjq0D[  
     break; ($WE=biZ&  
    case VK_CONTROL: E _iO@  
     MaskBits&=~CTRLBIT; qtzRCA!9(Z  
     break; aqr!oxn?t  
    case VK_SHIFT: z{?4*Bq  
     MaskBits&=~SHIFTBIT; !T'X 'Q  
     break; _V@P-Ye  
    default: //judge the key and send message ]k+m=OR{/  
     break; zWIeHIt  
   } V(mn yI  
   for(int index=0;index<MAX_KEY;index++){ LSkk;)'2K  
    if(hCallWnd[index]==NULL) JBcY!dy-d  
     continue; =n0*{~r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2)\vj5<~$  
    { ^7u#30,}3~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K.DXJ UR  
     bProcessed=TRUE; )5yj/0oT  
    } Alz~-hqQ  
   } )=H{5&e#u  
  } 3] 76fF\^[  
  else if((lParam&0xc000ffff)==1){ //Key down R^8B3-aA`  
   switch(wParam) /iC_!nu  
   { *fhX*e8y  
    case VK_MENU: e4.&aIC[  
     MaskBits|=ALTBIT; oR %agvc^^  
     break; Rd! 2\|  
    case VK_CONTROL: U e*$&VlT  
     MaskBits|=CTRLBIT; +ld;k/  
     break; |.w;r   
    case VK_SHIFT: K{L.ZH>7  
     MaskBits|=SHIFTBIT; \P?A7vuhLs  
     break; z="L4  
    default: //judge the key and send message 'ZnIRE,N  
     break; %v4 [{ =fE  
   } dlD}Ub  
   for(int index=0;index<MAX_KEY;index++) wkikD  
   { 6P+DnS[]  
    if(hCallWnd[index]==NULL) X8CVY0<o  
     continue; POGw`:)A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ` clB43 i  
    { 3k{ @.V ?]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `K?1L{p'4  
     bProcessed=TRUE; _T]>/}}p  
    } D'L{wm  
   } _A-V@%3  
  } 4<}A]BQVkJ  
  if(!bProcessed){ \"d?=uFe  
   for(int index=0;index<MAX_KEY;index++){ qG9qN.|dC  
    if(hCallWnd[index]==NULL) ,F: =(21  
     continue; &;v!oe   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) OCW+?B;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t _\MAK  
   } Y:pRcO.4g  
  } NG9vml  
 } 0w3b~RJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .B$h2#i1  
} ]u=Ca#!'  
{!=2<-Aq  
BOOL InitHotkey() ,so4Lb(vG  
{ hW%p#g;  
 if(hHook!=NULL){ 7) 0q--B  
  nHookCount++; ^<;w+%[MT  
  return TRUE; q\H7& w  
 } z!CD6W1n  
 else -N z}DW>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t w!.%_1^  
  if(hHook!=NULL) :t>Q:mX(N  
   nHookCount++; }17bV, t  
  return (hHook!=NULL); m!Af LSlwm  
} #!d]PH746  
BOOL UnInit() b-nYxd  
{ mV zu~xym  
 if(nHookCount>1){ @?/\c:cp  
  nHookCount--; DV,DB\P$  
  return TRUE; Jvj=I82  
 } {^wdJZ~QLK  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rfTe  
 if(unhooked==TRUE){ XnY"oDg^>  
  nHookCount=0; ]) n0MF)p  
  hHook=NULL; g7Z9F[d  
 } la702)N{  
 return unhooked; PP-kz;|  
} xt))]aH  
kY!C_kFcn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i4VK{G~g"  
{ XnA6/^  
 BOOL bAdded=FALSE; 8.2`~'V  
 for(int index=0;index<MAX_KEY;index++){ %EoH4LzT  
  if(hCallWnd[index]==0){ H),RA]S  
   hCallWnd[index]=hWnd; CJA+v-  
   HotKey[index]=cKey; KZ3B~#oQ  
   HotKeyMask[index]=cMask; F[`vH  
   bAdded=TRUE; W.$6 pzB(  
   KeyCount++; ee<H@LeG  
   break; J@<!q  
  } G>0)I  
 } KpGUq0d@  
 return bAdded; TkT-$=i  
} %~\  
gvo?([j-m  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _ n_sfT6)B  
{ |."G?*  
 BOOL bRemoved=FALSE; h0XH`v  
 for(int index=0;index<MAX_KEY;index++){ Bb_Q_<DTs  
  if(hCallWnd[index]==hWnd){ $_bZA;EMQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $rTu6(i1  
    hCallWnd[index]=NULL; 6$(0Ty  
    HotKey[index]=0; h--45`cE  
    HotKeyMask[index]=0; nNs .,J)  
    bRemoved=TRUE; QQ~23TlA  
    KeyCount--; O+vcs4  
    break; kF2Qv.5!  
   } N(BiOLZL6  
  } G1p'p&x.  
 } J7m`]!*t  
 return bRemoved; ,`"K  
} sW'6} ^Q  
idz9YpW  
void VerifyWindow() m0C{SBn-M  
{ @E(P9zQ/zy  
 for(int i=0;i<MAX_KEY;i++){ L ]*`4 L  
  if(hCallWnd!=NULL){ _'lmCj8L  
   if(!IsWindow(hCallWnd)){  feN!_ -  
    hCallWnd=NULL; dFMAh&:>  
    HotKey=0; |Q6h /"2  
    HotKeyMask=0; OF-WUa4t  
    KeyCount--;  `~h0?g  
   } L?Tu)<Mn  
  } #@q1Ko!NZ  
 } lfgtcR{l5  
} !^-OfqIHfV  
L,W:,i/C  
BOOL CHookApp::InitInstance() EO"6Dq(  
{ |C4o zl=O?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); dXDXRY.FMQ  
 hins=AfxGetInstanceHandle(); 18rp; l{  
 InitHotkey(); | F8]Xnds  
 return CWinApp::InitInstance(); IF e+ B"  
} ,A?{~?u.  
tStJ2-5*t  
int CHookApp::ExitInstance() w#rVSSXQ3  
{ 3jS7 uU  
 VerifyWindow(); >-eS&rma  
 UnInit(); Zg2]GJP  
 return CWinApp::ExitInstance(); ]An_5J  
} <ipWMZae0F  
[)0 R'xL6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file mfz"M)1p1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) N|o> %)R  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !9PX\Xbn  
#if _MSC_VER > 1000 sN=KRqe  
#pragma once y{?Kao7Ij  
#endif // _MSC_VER > 1000 88#N~j~P  
dt0T t  
class CCaptureDlg : public CDialog \Me"'.F?  
{ vyujC`61d  
 // Construction N7a[B>+`  
 public: y1nP F&_  
  BOOL bTray; vWuyft*  
  BOOL bRegistered; 2G H)iUmc  
  BOOL RegisterHotkey(); b13nE .  
  UCHAR cKey; }&C dsCM>2  
  UCHAR cMask; yX`J7O{=  
  void DeleteIcon(); \6Xn]S  
  void AddIcon(); y>4p~  
  UINT nCount; lu3Q,W  
  void SaveBmp(); \Ec X!aC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5%'o%`?i  
  // Dialog Data Zi ma^IL  
  //{{AFX_DATA(CCaptureDlg) _@7(g(pY 3  
  enum { IDD = IDD_CAPTURE_DIALOG }; $f9 ,##/  
  CComboBox m_Key; ta@ ISRK  
  BOOL m_bControl; xJ$Rs/9C  
  BOOL m_bAlt; Sio1Q0  
  BOOL m_bShift; Q:kwQg:~  
  CString m_Path; wE)] ah:  
  CString m_Number; HhzkMJR8  
  //}}AFX_DATA w' .'Yu6  
  // ClassWizard generated virtual function overrides ShsJ_/C2  
  //{{AFX_VIRTUAL(CCaptureDlg) gfV]^v  
 public: Tq.MubaO  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <1TlW ~q<  
 protected: 1<;\6sg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pHigxeV2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \dC.%#  
  //}}AFX_VIRTUAL Cm99?K  
  // Implementation v`@5enr  
 protected: P)a("XnJ`  
  HICON m_hIcon; 7}.#Z  
  // Generated message map functions Z'7 c^c7_  
  //{{AFX_MSG(CCaptureDlg) sURUQ  H  
  virtual BOOL OnInitDialog(); x.jYip  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6n2Vx1b  
  afx_msg void OnPaint(); Zkwy.Hq^  
  afx_msg HCURSOR OnQueryDragIcon(); AAIyr703cQ  
  virtual void OnCancel(); L,s|gt v  
  afx_msg void OnAbout(); u5  [1Z|O  
  afx_msg void OnBrowse(); G%V=idU*"  
  afx_msg void OnChange(); L8,H9T#e  
 //}}AFX_MSG -o=P85 V  
 DECLARE_MESSAGE_MAP() -D.B J(  
}; 9,Crmbw8  
#endif w>H%[\Qs  
N7RG5?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .{'Uvn  
#include "stdafx.h" pIU#c&%<9  
#include "Capture.h" T U"K#V&u  
#include "CaptureDlg.h" i_oro "%yL  
#include <windowsx.h> 4)x3!Ol  
#pragma comment(lib,"hook.lib") G#9o?  
#ifdef _DEBUG a<a&6 3  
#define new DEBUG_NEW V7K tbL#  
#undef THIS_FILE j. ks UJ  
static char THIS_FILE[] = __FILE__; ^C,/T2>  
#endif 7gZVg@   
#define IDM_SHELL WM_USER+1 thlpj*|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o2 T/IJP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4 _c:Vl  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; = C$ @DNEc  
class CAboutDlg : public CDialog LX(iuf+l  
{ &kXGWp  
 public: E,ZB;  
  CAboutDlg(); ZF/J/;uI  
  // Dialog Data \gJapx(  
  //{{AFX_DATA(CAboutDlg) QYf/tQg$  
  enum { IDD = IDD_ABOUTBOX }; NbQMWU~7  
  //}}AFX_DATA 4}r\E,`*X  
  // ClassWizard generated virtual function overrides r[UyI3(i^  
  //{{AFX_VIRTUAL(CAboutDlg) N18diP[C  
 protected: ]"2 v7)e  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ga 2Q3mV  
  //}}AFX_VIRTUAL Z)6nu)  
  // Implementation \KnD"0KW   
 protected: 1K*f4BnDr~  
  //{{AFX_MSG(CAboutDlg) <De3mZb  
  //}}AFX_MSG Ls$g-k%c@Q  
  DECLARE_MESSAGE_MAP() ~H yyq-  
}; \0^rJ1*  
sJHy=z0m  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) yTq(x4]  
{ q_T?G e  
 //{{AFX_DATA_INIT(CAboutDlg) eN2k8=  
 //}}AFX_DATA_INIT esC\R4he  
} Fgc:6<MGM  
J.1ln = Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n[MIa]dK  
{ Y+"hu2aPkY  
 CDialog::DoDataExchange(pDX); u{{xnyl?  
 //{{AFX_DATA_MAP(CAboutDlg) 4-}A'fTU8  
 //}}AFX_DATA_MAP "ZJ1`R=Mj  
} !+|N<`  
2 Zjb/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K+\0}qn  
 //{{AFX_MSG_MAP(CAboutDlg) cJ(zidf_$  
 // No message handlers M;vlQ"Yl'  
 //}}AFX_MSG_MAP 5(MZ%-~l  
END_MESSAGE_MAP() M:1F@\<  
,0<F3h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +O!M>  
: CDialog(CCaptureDlg::IDD, pParent) }Cq9{0by?a  
{ }2!5#/^~  
 //{{AFX_DATA_INIT(CCaptureDlg) Mp=kZs/  
  m_bControl = FALSE; "TH-A6v1  
  m_bAlt = FALSE; ZNH*[[Pf  
  m_bShift = FALSE; divZJc  
  m_Path = _T("c:\\"); o YI=p3l  
  m_Number = _T("0 picture captured."); |<Dx  
  nCount=0; L};;o+5uJD  
  bRegistered=FALSE; 4-nr_ WCm4  
  bTray=FALSE; l^eNZ3:H  
 //}}AFX_DATA_INIT bmq XP  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8,H5G`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `Py= ?[cD  
} W!4V: (T  
Xx<&6 4W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3f2Hjk7,d  
{ u+tb83 ~[=  
 CDialog::DoDataExchange(pDX); sr($Bw  
 //{{AFX_DATA_MAP(CCaptureDlg) Y/ac}q  
  DDX_Control(pDX, IDC_KEY, m_Key); =&*QT&e  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Lv5 ==w}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]E8<;t)#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); io33+/  
  DDX_Text(pDX, IDC_PATH, m_Path); I&NpN~AU  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .gkPG'm[  
 //}}AFX_DATA_MAP H{A| ~V)  
} _Il9s#NA%  
ch8w'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UV8r&O  
//{{AFX_MSG_MAP(CCaptureDlg) c+i`Zd.m<  
 ON_WM_SYSCOMMAND() QKaj4?p$|S  
 ON_WM_PAINT() ?kFCYZK|"  
 ON_WM_QUERYDRAGICON() S{)n0/_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [dF=1E>W_J  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w{O3P"N2  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n ua8y(W  
//}}AFX_MSG_MAP I~ ]mX;  
END_MESSAGE_MAP() MbFe1U]B  
#|_UA}Y  
BOOL CCaptureDlg::OnInitDialog() AW;) _|xM  
{ GuY5 % wr  
 CDialog::OnInitDialog(); <w2NJ ~M^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6.7 Kp  
 ASSERT(IDM_ABOUTBOX < 0xF000); |mE +f]7$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); H|:)K^o  
 if (pSysMenu != NULL) <^q"31f  
 { =ObtD"  
  CString strAboutMenu; ~q|e];tA  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <W%Z_d&Xv  
  if (!strAboutMenu.IsEmpty()) xv%USm  
  { iai4$Y(%  
   pSysMenu->AppendMenu(MF_SEPARATOR); u,,WD  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Hi" n GH  
  } tc2GI6]e'  
 } tP(bRQ>  
 SetIcon(m_hIcon, TRUE); // Set big icon ee0>B86tE  
 SetIcon(m_hIcon, FALSE); // Set small icon 'U{: zBh  
 m_Key.SetCurSel(0); 3jeV4|  
 RegisterHotkey(); v4##(~Tu  
 CMenu* pMenu=GetSystemMenu(FALSE); n_&)VF#n(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %s :  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ow$l!8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;AB,:*  
 return TRUE; // return TRUE unless you set the focus to a control sr@XumT  
} }_/h~D9-T#  
&c9Fw:f;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !=:MG#p  
{ <H@!Xw;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -LK(C`gB  
 { f=O>\  
  CAboutDlg dlgAbout; g+r{>x  
  dlgAbout.DoModal(); BCZnF /Zo  
 } PZg]zz=V4  
 else uvv-lAbjw  
 { [%,=0P}  
  CDialog::OnSysCommand(nID, lParam); RkP|_Bf8)  
 } $5CY<,f  
} 9x^ /kAB  
m:Cx~  
void CCaptureDlg::OnPaint() 'L59\y8H  
{ "v(]"L  
 if (IsIconic()) `/ReJj&~  
 { uWtS83i  
  CPaintDC dc(this); // device context for painting 2pNJWYW"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JU \J  
  // Center icon in client rectangle |=}~>!!  
  int cxIcon = GetSystemMetrics(SM_CXICON); m:O2_%\l  
  int cyIcon = GetSystemMetrics(SM_CYICON); I"<. h'  
  CRect rect; ]sP9!hup  
  GetClientRect(&rect); [#6Esy8|  
  int x = (rect.Width() - cxIcon + 1) / 2; F8;4Oj  
  int y = (rect.Height() - cyIcon + 1) / 2; WM )g(i~(  
  // Draw the icon !;C(pnE  
  dc.DrawIcon(x, y, m_hIcon); R{A/ +7!  
 } H08YM P>dc  
 else f/i,Zw  
 { +9rbQ? '  
  CDialog::OnPaint(); 6U9Fa=%>}  
 } rWpfAE)!  
} 7{F9b0zwk  
9}$dwl(  
HCURSOR CCaptureDlg::OnQueryDragIcon()  !Ocg  
{ C\@YH]  
 return (HCURSOR) m_hIcon; L(P:n-^  
} J$*["y`+  
!rGI),  
void CCaptureDlg::OnCancel() G/44gKl  
{ A?KKZ{Pl  
 if(bTray) y/VmjsN}  
  DeleteIcon(); zGz'2, o3  
  CDialog::OnCancel(); B_jI!i{N%o  
} \J&#C(pn  
NfN6KDd]2L  
void CCaptureDlg::OnAbout() >Nl~"J|]q  
{ jAHn`Bxz  
 CAboutDlg dlg; OG.`\G|  
 dlg.DoModal(); QeK~A@|F&  
} sU>*S$X8  
|Q{l ]D  
void CCaptureDlg::OnBrowse() kmf4ax h1  
{ -V\33cA  
 CString str; 3 . @W.GG8  
 BROWSEINFO bi; kys?%Y1  
 char name[MAX_PATH]; {W-PYHZ;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); IJ!UKa*o%  
 bi.hwndOwner=GetSafeHwnd(); I++!F,pB  
 bi.pszDisplayName=name; g\ke,r6  
 bi.lpszTitle="Select folder"; ]fR 3f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V!oyC$eV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); = zsXa=<  
 if(idl==NULL) P<bA~%<7"[  
  return; 4m~\S)ad  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pDu~84!])  
 str.ReleaseBuffer(); Dv$xP)./  
 m_Path=str; ]xuq2MU,l  
 if(str.GetAt(str.GetLength()-1)!='\\') _onHe"%{  
  m_Path+="\\"; Y.-i;Mmu  
 UpdateData(FALSE); RvVnVcn^#  
} ?)9 6YX'  
U_w)*)F  
void CCaptureDlg::SaveBmp() ':HV9]k  
{ mCg5-E~;  
 CDC dc; LnBkd:>}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); __zsrIUJ  
 CBitmap bm; )sW1a  
 int Width=GetSystemMetrics(SM_CXSCREEN); Bq'hk<ns[  
 int Height=GetSystemMetrics(SM_CYSCREEN); FrB19  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Rq;R{a  
 CDC tdc;  p.zU9rID  
 tdc.CreateCompatibleDC(&dc); &fW;;>  
 CBitmap*pOld=tdc.SelectObject(&bm); -QRKDp  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &4 ]%&mX)-  
 tdc.SelectObject(pOld); fz:F*zT1  
 BITMAP btm; P afmHXx  
 bm.GetBitmap(&btm); 'Y[\[]3[8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -2f0CAh~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m0 `wmM  
 BITMAPINFOHEADER bih; %F03cI,  
 bih.biBitCount=btm.bmBitsPixel; py)V7*CgH  
 bih.biClrImportant=0;  pxP7yJL`  
 bih.biClrUsed=0; ] $5rh8  
 bih.biCompression=0; @%RDw*L(  
 bih.biHeight=btm.bmHeight; 8R)*8bb  
 bih.biPlanes=1; KBXdr52"  
 bih.biSize=sizeof(BITMAPINFOHEADER); !Qn:PSk  
 bih.biSizeImage=size; Xc'yz 2B  
 bih.biWidth=btm.bmWidth; SMnbI .0  
 bih.biXPelsPerMeter=0; O9!<L.X,%  
 bih.biYPelsPerMeter=0; ]Dx5t&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z. 7 UfLV9  
 static int filecount=0; _c`Gxt%  
 CString name; P4s:wuJ^  
 name.Format("pict%04d.bmp",filecount++); 64[j:t=N  
 name=m_Path+name; 7pkc*@t  
 BITMAPFILEHEADER bfh; n`CmbM@@  
 bfh.bfReserved1=bfh.bfReserved2=0; $+$+;1[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sjztT<{Q^-  
 bfh.bfSize=54+size; t@b';Cuv  
 bfh.bfOffBits=54; #*?a"  
 CFile bf;  ~B/|#o2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )5bhyzSZI  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R\6#J0&Y-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .0Cpqn,[  
  bf.WriteHuge(lpData,size); ?"J5~_U.  
  bf.Close(); ,~c:P>v=  
  nCount++; O(CUwk  
 } AM\`v'I*6  
 GlobalFreePtr(lpData); 9Lv`3J^~  
 if(nCount==1) 6D) vY  
  m_Number.Format("%d picture captured.",nCount); s}UPe)Vu  
 else 2g|+*.*`  
  m_Number.Format("%d pictures captured.",nCount); Gu9Ap<>!  
  UpdateData(FALSE); ;p) gTQa  
} PJO +@+"{@  
`[[ A 7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) pM.>u/=X  
{ t hTY('m  
 if(pMsg -> message == WM_KEYDOWN) V&[|%jm&   
 { pvkru-i]  
  if(pMsg -> wParam == VK_ESCAPE) 0!\pS{$zB  
   return TRUE; *S`& X Pj  
  if(pMsg -> wParam == VK_RETURN) L7C!rS  
   return TRUE; !c'a<{d@  
 } *=)%T(^  
 return CDialog::PreTranslateMessage(pMsg); yn"8Ma*  
} eCdMDSFO3  
]#KZ W)M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  KGFmC[  
{ =l?5!f9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /mF%uI>:  
  SaveBmp(); cC b'z1  
  return FALSE; px" .pYr0  
} d%\en&:la  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ut fD$8UI  
 CMenu pop; ;y Wfb|!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); yIOoVi\m  
 CMenu*pMenu=pop.GetSubMenu(0); q>?uB4>^  
 pMenu->SetDefaultItem(ID_EXITICON); [C.Pzo  
 CPoint pt; h1q?kA  
 GetCursorPos(&pt); 4F^(3RKZ|  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5$`ihO?  
 if(id==ID_EXITICON) ":tQYo]d  
  DeleteIcon(); o&-q.;MY  
 else if(id==ID_EXIT) ?1JS*LQ$  
  OnCancel(); now\-XrS  
 return FALSE; T&j_7Q\;vI  
} LSs!U 3"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]KBzuz%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~L<q9B( @  
 AddIcon(); !:'%'@uc  
 return res; z|x0s0q?  
} f4@>7K]9TA  
0V }knR.l  
void CCaptureDlg::AddIcon() 'x$>h)t]  
{ >T'^&l(:  
 NOTIFYICONDATA data; CuR.a  
 data.cbSize=sizeof(NOTIFYICONDATA); Wz`MEyj  
 CString tip; oQ{(7.e7)  
 tip.LoadString(IDS_ICONTIP); 0sD"Hu  
 data.hIcon=GetIcon(0); ou0(C `  
 data.hWnd=GetSafeHwnd(); +vY8HQ|v  
 strcpy(data.szTip,tip); ]X ,f  
 data.uCallbackMessage=IDM_SHELL; gf$5pp-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; KU|dw^Yk  
 data.uID=98; sL[&y'+  
 Shell_NotifyIcon(NIM_ADD,&data); 1\X1G>60m  
 ShowWindow(SW_HIDE); *F42GiBZR  
 bTray=TRUE; URz$hcI8  
} Y &6vTU  
D~P I_*h.  
void CCaptureDlg::DeleteIcon() fo;Ftf0  
{ no~hYy W2  
 NOTIFYICONDATA data; 5|._K(M  
 data.cbSize=sizeof(NOTIFYICONDATA); f5.rzrU  
 data.hWnd=GetSafeHwnd(); +l+8Z:i<  
 data.uID=98; @doo2qqIe]  
 Shell_NotifyIcon(NIM_DELETE,&data); <x e=G]v  
 ShowWindow(SW_SHOW); $[x2L s~  
 SetForegroundWindow(); zZ@]Kq;.s  
 ShowWindow(SW_SHOWNORMAL); 2y s'q !  
 bTray=FALSE; By%mJ%$~  
} WqlX'tA  
 ky0Fm W  
void CCaptureDlg::OnChange() Lf`LFPKb  
{ 35|F?Jx.r  
 RegisterHotkey(); !$ItBn/_  
} }d?"i@[  
yhhW4rz  
BOOL CCaptureDlg::RegisterHotkey() =B-a]?lM  
{ B U |]4  
 UpdateData(); o&g-0!"  
 UCHAR mask=0; ~"6/OJA  
 UCHAR key=0; \D}K{P  
 if(m_bControl) )FVW/{NF@q  
  mask|=4; ,Wtod|vx\U  
 if(m_bAlt) n%yMf!M .:  
  mask|=2; |E/U(VS3l~  
 if(m_bShift) <!gq9  
  mask|=1; 6EfGJq  
  key=Key_Table[m_Key.GetCurSel()]; yU`"]6(@[  
 if(bRegistered){ g).k+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Lx6C fR  
  bRegistered=FALSE; p^S]O\;M7  
 } |wW_Z!fL  
 cMask=mask; cK6M8:KW  
 cKey=key; ZU\TA|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mVUDPMyZ  
 return bRegistered; VbQ9o  
} }g6:9%ZMu  
A& u"NgJ  
  四、小结 & c a-  
,QU2xw D[  
  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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