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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: O(I^:_eH  
  %w^*7Oi  
  一、实现方法 /C8}5)  
iQ" LIeD  
  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: 3g4=as4w  
fJr EDj4(  
#pragma data_seg("shareddata") ;\w3IAa|V  
HHOOK hHook =NULL; //钩子句柄  b+a+OI D  
UINT nHookCount =0; //挂接的程序数目 k{mBG9[z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3*I\#Z4p1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^gcB+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5)< Y3nU~  
static int KeyCount =0; xF{%@t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _h<rVcl!wX  
#pragma data_seg() KNmU2-%l  
T^;b98*  
  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。 #8h7C8]&  
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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: PR"x&JG@  
fof}I:vO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Y#c439&  
cKey,UCHAR cMask) MtL<)?HQ  
{ %j^QK>%  
 BOOL bAdded=FALSE; @K!JE w\  
 for(int index=0;index<MAX_KEY;index++){ pG"wQ  
  if(hCallWnd[index]==0){ nT> v  
   hCallWnd[index]=hWnd; ke2dQ^kc4  
   HotKey[index]=cKey; 9xbT?$^  
   HotKeyMask[index]=cMask; xy:Mb =r  
   bAdded=TRUE; FQ 0&{ulb  
   KeyCount++; A4,%l\di<  
   break; BlpyE[h T  
  } JE}VRMNr  
 } 5, ,'hAq_  
 return bAdded; !@lx|= #  
} a!bW^?PcK  
//删除热键 6MM\nIU)/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BR|0uJ.M  
{ ].rKfv:  
 BOOL bRemoved=FALSE; 5 <k)tF%  
 for(int index=0;index<MAX_KEY;index++){ w\i]z1  
  if(hCallWnd[index]==hWnd){ U3_O}X+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *eHa4I  
    hCallWnd[index]=NULL; rSv,;v  
    HotKey[index]=0; *DIY;)K  
    HotKeyMask[index]=0; *=oO3c0|b,  
    bRemoved=TRUE; 4AEw[(t  
    KeyCount--; 'GezIIaH  
    break; Jd/d\P  
   } $B?8\>_?  
  } EeMKo  
 } =7e!'cF[  
 return bRemoved; Ze>R@rK  
} P Ptmh. }e  
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Lp-$Ie  
  DLL中的钩子函数如下: &ic'!h"  
3ux7^au  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d8;kM`U  
{ i tNuY<"  
 BOOL bProcessed=FALSE; Fk49~z   
 if(HC_ACTION==nCode) cEa8l~GC<  
 { Fy\q>(v.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 n@tt.n!{l  
   switch(wParam) xGyl7$J  
   {  *bo| F%NAz  
    case VK_MENU: +pgHCzwJE  
     MaskBits&=~ALTBIT;  ^[SW07o~  
     break; aPlEM_escS  
    case VK_CONTROL: uxn+.fA  
     MaskBits&=~CTRLBIT; mC@v,"  
     break; H0&wn#);6R  
    case VK_SHIFT: *~GI-h  
     MaskBits&=~SHIFTBIT; :ILpf+`yY  
     break; f|(9+~K/7&  
    default: //judge the key and send message Il4]1d|  
     break; MOh&1]2j5  
   } 9b >+ehjB  
   for(int index=0;index<MAX_KEY;index++){ 4z P"h0  
    if(hCallWnd[index]==NULL) mf g>69,w  
     continue; Fc[vs52  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P !f{U;B  
    { \mLEwNhRY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `W}pA mhj  
     bProcessed=TRUE; ? ch?q~e)  
    } oU,8?( }'~  
   } 9O&m7]3  
  } z*.G0DFw  
  else if((lParam&0xc000ffff)==1){ //有键按下 423%K$710  
   switch(wParam) cvy 5|;-u  
   { LhKbZ oPp  
    case VK_MENU: q !9;JrX  
     MaskBits|=ALTBIT; 00D.Jn  
     break; ;bG?R0a  
    case VK_CONTROL: jMBM qQNU  
     MaskBits|=CTRLBIT; ?J + jv  
     break; #Pk{emYW  
    case VK_SHIFT: JAKs [@:  
     MaskBits|=SHIFTBIT; 3mofp`e  
     break; /-!Fr:Ox>  
    default: //judge the key and send message l8(9?!C  
     break; #Tzs9Bkaca  
   } p#w8$Qjp  
   for(int index=0;index<MAX_KEY;index++){ u9Adu`  
    if(hCallWnd[index]==NULL) @ NDcO,]  
     continue; h-Y>>l>PW0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~D5FnN9  
    { ]:@{tX 7c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6X9$T11Vc  
     bProcessed=TRUE; An#[ +?  
    } Y?1T XsvF  
   } uSYI X  
  } Y*pXbztP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 V?*fl^f  
   for(int index=0;index<MAX_KEY;index++){ b=BNbmX  
    if(hCallWnd[index]==NULL) 8J&9}@y  
     continue; z[ ;n2o|s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +C;;4s)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [4C_iaE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2k=|p@V n~  
   } %pWJ2J@  
  } }R}M>^(R4  
 } >0:3CpO*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O[$X36z  
} ?glx8@  
N:Q.6_%^  
  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: `L$Av9X\  
QZ(O2!Mg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~sn3_6{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NG3:=  
>A]l|#Rz  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: :j3^p8]  
J ?aJa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) > .}G[C  
{ X} V]3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~0024B[G  
 { mpD.x5jm<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 h`! 4`eI  
  SaveBmp(); K)x6F 15r  
  return FALSE; nm\f$K>Pg  
 } q("l?'  
 …… //其它处理及默认处理 Am3j:|>*  
} f%_$RdU  
Z%ZOAu&p  
)CoFRqz<h  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 dk1q9Tx  
nTsV>lQY,  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 WxD$k3U  
`0W"[BY  
  二、编程步骤 `lm'_~=`&  
Y:+:>[F  
  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"; %r6_['T  
D->E&#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fh_:ung  
H/[(T%]o  
  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; 1Zk1!> ?  
N1g;e?T ':  
  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; k}kwr[  
wp8-(E^  
  5、 添加代码,编译运行程序。 VIGLl'8p  
=&-.]| t  
三、程序代码 aVV E 2:M  
gjK: a@{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL tculG|/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) s$9ow<oi]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ sX>|Y3S\U  
#if _MSC_VER > 1000 yTbtS-  
#pragma once K; hP0J  
#endif // _MSC_VER > 1000 }Dcpe M?  
#ifndef __AFXWIN_H__ OmK0-fa/  
#error include 'stdafx.h' before including this file for PCH O*/Utl  
#endif Tf$>^L  
#include "resource.h" // main symbols / L$q8+  
class CHookApp : public CWinApp 3- d"-'k  
{ R(y`dQy<K  
 public: nx`W!|g$`  
  CHookApp(); lr)MySsu#H  
  // Overrides <.lN'i;(  
  // ClassWizard generated virtual function overrides t':*~b{V@7  
  //{{AFX_VIRTUAL(CHookApp) 70*yx?TV  
 public: &SZAe/3+  
  virtual BOOL InitInstance(); "lA$;\&  
  virtual int ExitInstance(); YP"%z6N@v  
  //}}AFX_VIRTUAL #/`MYh=!W  
  //{{AFX_MSG(CHookApp) {az LtTh  
  // NOTE - the ClassWizard will add and remove member functions here. OB(~zUe.R  
  // DO NOT EDIT what you see in these blocks of generated code ! DVs$3RL  
  //}}AFX_MSG ?|2m0~%V=  
  DECLARE_MESSAGE_MAP() yYk?K<ou  
}; T8T,G4Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6xh -m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XxB%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (|6!pQ7  
BOOL InitHotkey(); 7S&O {Q7)  
BOOL UnInit(); v"sU87+  
#endif MS|1Q@S9  
s5d[sx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tUfze9m  
#include "stdafx.h" odcrP\S  
#include "hook.h" 8fWnKWbbjw  
#include <windowsx.h> blbzh';0}  
#ifdef _DEBUG pek5P4W_  
#define new DEBUG_NEW kc2E4i  
#undef THIS_FILE 8p~[8}  
static char THIS_FILE[] = __FILE__; t nmz5Q  
#endif ? zic1i  
#define MAX_KEY 100 y(K:,CI  
#define CTRLBIT 0x04 b$Bq#vdg:  
#define ALTBIT 0x02 5oD%~Fk l  
#define SHIFTBIT 0x01 P!~&Ei  
#pragma data_seg("shareddata") [nsTO5G$u  
HHOOK hHook =NULL; [S`Fm>,  
UINT nHookCount =0; # zd}xla0]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *i7-_pT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT V3pn@'pr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =8qhK=&]  
static int KeyCount =0; =PBJ+"DQs  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^dhtc% W>  
#pragma data_seg() \w{fq+G  
HINSTANCE hins; =)6|lz^  
void VerifyWindow(); BxxqzN+  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) t9 id^  
//{{AFX_MSG_MAP(CHookApp) {K=[Fu=  
// NOTE - the ClassWizard will add and remove mapping macros here. {}PBYX R  
// DO NOT EDIT what you see in these blocks of generated code! DGAg#jh  
//}}AFX_MSG_MAP ORV'dr  
END_MESSAGE_MAP() q*>|EJR^Rw  
A56aOI=  
CHookApp::CHookApp() xaSiG  
{ oP<E)  
 // TODO: add construction code here, eY$Q}BcW  
 // Place all significant initialization in InitInstance 0ipYXbC  
} ^yF2xJ)9-  
f=MR.\  
CHookApp theApp; !3at(+4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Lr(wS {  
{ KI<Vvc m  
 BOOL bProcessed=FALSE; BtWm ZaKi  
 if(HC_ACTION==nCode) j\@|oW0  
 { ~hA;ji|I  
  if((lParam&0xc0000000)==0xc0000000){// Key up oakm{I|k}  
   switch(wParam) L@5g#mSl  
   { \?.M1a[  
    case VK_MENU: o{QPW  
     MaskBits&=~ALTBIT; !}uev  
     break; ;,_c1x/F  
    case VK_CONTROL: J 9k~cz  
     MaskBits&=~CTRLBIT; 9_S>G$9D  
     break; |a Ht6F  
    case VK_SHIFT: *8QGv6*vQ  
     MaskBits&=~SHIFTBIT; 8[z& g%u  
     break; ,7Lu7Q  
    default: //judge the key and send message QVrMrm+vRv  
     break; MU&P+Wr  
   } rU1{a" {  
   for(int index=0;index<MAX_KEY;index++){ $y*[" ~TJ  
    if(hCallWnd[index]==NULL) 5/{gY{  
     continue; %g&i.2v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -@_V|C'?  
    { AJH-V 6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ep"54o5=d  
     bProcessed=TRUE; 9Lxj ]W2^  
    } q^w3n2  
   } NCysYmt  
  } Ijj]_V{,  
  else if((lParam&0xc000ffff)==1){ //Key down 9Ic~F^  
   switch(wParam) vN4g#,<  
   { s*j0uAq)up  
    case VK_MENU: M%2 F7 FY  
     MaskBits|=ALTBIT; .@ElfPP(L  
     break; #G ZGk?  
    case VK_CONTROL: APksY!  
     MaskBits|=CTRLBIT; &ExYul  
     break; !Q5ip'L  
    case VK_SHIFT: `#~HCl  
     MaskBits|=SHIFTBIT; q[SUYb;,  
     break; sj@'C@oK  
    default: //judge the key and send message :3Z"Qk$uR  
     break; fOyLBixR  
   } m<;&B   
   for(int index=0;index<MAX_KEY;index++) sf5koe  
   { az]S&\i7T  
    if(hCallWnd[index]==NULL) IZ6[|Ach6  
     continue; +H L]t'UEg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;0VE *  
    { UujFZg[-P9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NN W*  
     bProcessed=TRUE; OC]_b36v  
    } 6!n%SUt  
   } b1;80P/:D  
  } ^4yFLqrC  
  if(!bProcessed){ [ Q6v#I  
   for(int index=0;index<MAX_KEY;index++){ (HkMubnqg  
    if(hCallWnd[index]==NULL) A %s"WSx,  
     continue; vx_v/pD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >p 7e6%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RSY{IY  
   } cwxO| .m  
  } G =+sW  
 } i=<N4Vx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b&Sk./ J6  
} bg)yl iX  
9c1n  
BOOL InitHotkey() DPNUm<>  
{ q*<Df=+B  
 if(hHook!=NULL){ t$Z#zx X  
  nHookCount++; !f \y3p*j  
  return TRUE; E0}jEl/{  
 } bd2"k;H<o  
 else `1KZ14K  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;o#R(m@Lx  
  if(hHook!=NULL) eRa1eR gP  
   nHookCount++; '7{0k{  
  return (hHook!=NULL); !R WX1Z  
} yl%F}kBR  
BOOL UnInit() 56m|gZcC  
{ $vdGkz@6  
 if(nHookCount>1){ Z;W`deA  
  nHookCount--; fmvv q1G&  
  return TRUE; '+ |{4-V  
 } m(8t |~S  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @fbB3  
 if(unhooked==TRUE){ H0s,tTK8  
  nHookCount=0; g!O(@Sqp1  
  hHook=NULL; m4 *Rr  
 } cV5Lp4wY?  
 return unhooked; @qH<4`y.^  
} c)M_&?J!5  
-~ `5kO~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2Fce| Tn  
{ It4J \S  
 BOOL bAdded=FALSE; Kl$!_$  
 for(int index=0;index<MAX_KEY;index++){ s"G6aM  
  if(hCallWnd[index]==0){ ^=wG#!#V"1  
   hCallWnd[index]=hWnd; ~OEP)c\k  
   HotKey[index]=cKey; g0^%X9s  
   HotKeyMask[index]=cMask; G)?O!(_  
   bAdded=TRUE; 0QDm3V0n  
   KeyCount++; J%;TK6  
   break; R)#D{/#FW  
  } XWbe|K!e  
 } /cr.}D2O  
 return bAdded; gR(*lXm5w  
} M,PZ|=V6a  
Bj J$I^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t.>vLzrU  
{ >'8.>f  
 BOOL bRemoved=FALSE; 1DGVAIcD  
 for(int index=0;index<MAX_KEY;index++){ ~/h P6*  
  if(hCallWnd[index]==hWnd){ -X Bh\w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7k:}9M~  
    hCallWnd[index]=NULL; ?PSm) ~ Oa  
    HotKey[index]=0; rBkf@  
    HotKeyMask[index]=0; Q4Q*5>  
    bRemoved=TRUE; 'j!7 O+7y  
    KeyCount--; 6pQ#Zg()vp  
    break; ^[8e|,U  
   } ^owEB%  
  } X{ZBS^M  
 } >GgX-SZ%  
 return bRemoved; abCcZ<=|b  
} ?4_^}B9  
|jaUVE_2[  
void VerifyWindow() &|26x >  
{ U\ y?P:yy  
 for(int i=0;i<MAX_KEY;i++){ Om{[ <tL  
  if(hCallWnd!=NULL){ >wM%|j'  
   if(!IsWindow(hCallWnd)){ +8Zt<snG  
    hCallWnd=NULL; q=}Lm;r  
    HotKey=0; ALwkX"AN  
    HotKeyMask=0; *n2Q_o  
    KeyCount--; yI bz\3  
   } M0x5s@  
  } o 1#XM/Z  
 } sN 7I~  
} _4rb7"b1  
L;5j hVy  
BOOL CHookApp::InitInstance() co<){5zOT  
{ T8ZBQ;o  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FymA_Eq  
 hins=AfxGetInstanceHandle(); OgS6#X  
 InitHotkey(); qw0tw2|  
 return CWinApp::InitInstance(); z(>{"t<C  
} #v')iR"  
{`KgyC W:  
int CHookApp::ExitInstance() =6j  5,  
{ 91%+Bf()J6  
 VerifyWindow(); q[1H=+  
 UnInit(); 1U~AupHE  
 return CWinApp::ExitInstance(); -Z<e`iFQS  
} n@5pS3qZ  
brNe13d3~"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V@8 4Cb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u sR19_E-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sxO_K^eD  
#if _MSC_VER > 1000 rNqJL_!  
#pragma once WMZa6cH  
#endif // _MSC_VER > 1000 HQaKG4Z  
[lQp4xgxi  
class CCaptureDlg : public CDialog ,ye>D='  
{ %g0"Kj5  
 // Construction HHCsWe-  
 public: Fx0K.Q2Y0  
  BOOL bTray; 8b(UqyV  
  BOOL bRegistered; ;MCv  
  BOOL RegisterHotkey(); dj?.Hc7od  
  UCHAR cKey; u-pE ;|  
  UCHAR cMask; A86#7  
  void DeleteIcon(); |>A1J:  
  void AddIcon(); u$&7fmZ  
  UINT nCount; aAwnkQ$  
  void SaveBmp(); }o=R7n%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Gc4N)oq)}b  
  // Dialog Data =@binTC4  
  //{{AFX_DATA(CCaptureDlg) cIja^xD  
  enum { IDD = IDD_CAPTURE_DIALOG }; %6L!JN  
  CComboBox m_Key;  ~ceGx  
  BOOL m_bControl; gJ c5Y  
  BOOL m_bAlt; mv SNKS  
  BOOL m_bShift; KHcf P7  
  CString m_Path; ^P:9iu)+]~  
  CString m_Number; `\q4z-<-  
  //}}AFX_DATA A]BG*  
  // ClassWizard generated virtual function overrides . ~G>vVb  
  //{{AFX_VIRTUAL(CCaptureDlg) h}z^NX  
 public: zEF3B  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 15 uVvp/  
 protected: qp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /I$g.f/#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); F]z xx  
  //}}AFX_VIRTUAL ;r- \h1iA'  
  // Implementation ]Vl * !,(i  
 protected: %I(N  
  HICON m_hIcon; =^q:h<  
  // Generated message map functions O<iE,PN)  
  //{{AFX_MSG(CCaptureDlg) r&1N8o  
  virtual BOOL OnInitDialog(); e@Z(z^V  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Nh]eZ3O  
  afx_msg void OnPaint(); a%;$l_wVT:  
  afx_msg HCURSOR OnQueryDragIcon(); *J8j_-i,R  
  virtual void OnCancel(); 2y ~]Uo  
  afx_msg void OnAbout(); eAu3,qoM  
  afx_msg void OnBrowse(); rNfua   
  afx_msg void OnChange(); 0}PW?t76  
 //}}AFX_MSG 0D|^S<z6  
 DECLARE_MESSAGE_MAP() o*f7/ZP1o  
}; (IIOKx_  
#endif d|j3E  
26 o68U8&y  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ` B : Ydf  
#include "stdafx.h" g?^o++  
#include "Capture.h" HP. j.  
#include "CaptureDlg.h" 6;I&{9  
#include <windowsx.h> UG&/0{j5XV  
#pragma comment(lib,"hook.lib") G}BO!Z6  
#ifdef _DEBUG qK.8^{b  
#define new DEBUG_NEW jf*M}Q1jHE  
#undef THIS_FILE a`q">T%q  
static char THIS_FILE[] = __FILE__; cEve70MV  
#endif h+,zfVJu  
#define IDM_SHELL WM_USER+1 2B=yT8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [% |i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  Cj_cu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UR1U; k  
class CAboutDlg : public CDialog WkXa%OZ  
{ 2P!Pbl<  
 public: s7(mNpo  
  CAboutDlg(); R\A5f\L9  
  // Dialog Data iW-w?!>|m  
  //{{AFX_DATA(CAboutDlg) 2[r#y1ro  
  enum { IDD = IDD_ABOUTBOX }; k U*\Fa*E  
  //}}AFX_DATA d=xU f`^  
  // ClassWizard generated virtual function overrides O6Xu/X]  
  //{{AFX_VIRTUAL(CAboutDlg) 4}W*,&_  
 protected: #&1mc_`/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,D+pGxbr   
  //}}AFX_VIRTUAL g>/,},jv[x  
  // Implementation /XS}<!)%  
 protected: P3on4c  
  //{{AFX_MSG(CAboutDlg) 'r(}7>~fC  
  //}}AFX_MSG -XkCbxZ  
  DECLARE_MESSAGE_MAP() !RFlv  
}; ,K+K`"Oy  
(/v(.t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9{'GrL  
{ Jq<&`6hn  
 //{{AFX_DATA_INIT(CAboutDlg) Ad9'q!_en  
 //}}AFX_DATA_INIT $ze%! C  
} (](:0H  
,m8l /wG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -% 5*c61  
{ (pREo/T  
 CDialog::DoDataExchange(pDX); < :<E~anH  
 //{{AFX_DATA_MAP(CAboutDlg) 9Fv1D  
 //}}AFX_DATA_MAP XBF#ILJ  
} owmV7E1  
|@sUN:G4k  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CS:j->  
 //{{AFX_MSG_MAP(CAboutDlg) k9 .@S  
 // No message handlers vCFMO3  
 //}}AFX_MSG_MAP ^UEI`_HO0  
END_MESSAGE_MAP() t}c ymX~  
g.SFl  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (}V.xi  
: CDialog(CCaptureDlg::IDD, pParent) '.c [7zL  
{ Ldf<  
 //{{AFX_DATA_INIT(CCaptureDlg) :+bQPzL  
  m_bControl = FALSE; F7Mf>."  
  m_bAlt = FALSE; !X` 5  
  m_bShift = FALSE; SBzJQt@Hs  
  m_Path = _T("c:\\"); W[AX?  
  m_Number = _T("0 picture captured."); 8jMw7ti  
  nCount=0; %qV=PC  
  bRegistered=FALSE; 4sP0oe[h  
  bTray=FALSE; PL@hsZty~c  
 //}}AFX_DATA_INIT vCb3Ra~L`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0 x4Xs  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); K``MS  
} #OqQD6  
plh.-"   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I ^?TabL  
{ Z[)t34EY"  
 CDialog::DoDataExchange(pDX); $k,Z)2  
 //{{AFX_DATA_MAP(CCaptureDlg) Ckj2$c~  
  DDX_Control(pDX, IDC_KEY, m_Key); g1@zk $  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Q]S~H+eRy  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l<ag\ d  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2RFYnDN  
  DDX_Text(pDX, IDC_PATH, m_Path); ylUxK{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )iNM jg  
 //}}AFX_DATA_MAP 9s>q4_D  
} WldlN?[j  
}rj.N98  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4c_TrNwP  
//{{AFX_MSG_MAP(CCaptureDlg) V: fz  
 ON_WM_SYSCOMMAND() =ps3=D  
 ON_WM_PAINT() 9.{u2a\  
 ON_WM_QUERYDRAGICON() ({v$!AAv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^ |z|kc  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TD'RvTpl  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *T-+Pm-Cq  
//}}AFX_MSG_MAP FIL?nkYEO  
END_MESSAGE_MAP() (0/,R  
LBq~?Q.e  
BOOL CCaptureDlg::OnInitDialog() DJVH}w}9_P  
{ 4/;hA z  
 CDialog::OnInitDialog(); jVC`38|  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;PCnEs  
 ASSERT(IDM_ABOUTBOX < 0xF000); NoTEbFrV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Se.\wkl#Y  
 if (pSysMenu != NULL) #k&"R v;,  
 { VCSHq&p8  
  CString strAboutMenu; wzVx16Rvc  
  strAboutMenu.LoadString(IDS_ABOUTBOX); B 7zyMh   
  if (!strAboutMenu.IsEmpty()) 4nK\gXz19  
  { {;4Y5kj  
   pSysMenu->AppendMenu(MF_SEPARATOR); )e(Rf!P{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UbNA|`H  
  } jfP2n5X83  
 } \3JZ =/  
 SetIcon(m_hIcon, TRUE); // Set big icon m \o<a|  
 SetIcon(m_hIcon, FALSE); // Set small icon %X7R_>.   
 m_Key.SetCurSel(0); Y~gDS^8  
 RegisterHotkey(); d[E~}Dq3#  
 CMenu* pMenu=GetSystemMenu(FALSE); }Qyuy~-&^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~P8 6=Vw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^,*ED Yz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ` Fnl<C<  
 return TRUE; // return TRUE unless you set the focus to a control t2skg  
} !~Gx@Ro  
:)o 4fOJ8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O=~8+sa  
{ ZKy)F-yX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s~ ||Vv!  
 { nr7#}pzo  
  CAboutDlg dlgAbout; Yv<' QC  
  dlgAbout.DoModal(); ]L+YnZ?6  
 } PP)iw@9j  
 else RfH.WXi  
 { ~QgyhJM_h=  
  CDialog::OnSysCommand(nID, lParam); TRP#b 7nC  
 } q.0Evr:  
} !~Vo'ykwx'  
4<}!+X7m  
void CCaptureDlg::OnPaint() POvxZU  
{ 8=QOp[w   
 if (IsIconic()) /kV3[Rw+  
 { z"#iG&>a,  
  CPaintDC dc(this); // device context for painting )3K#${p  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .c__<I<G<  
  // Center icon in client rectangle wJyrF  
  int cxIcon = GetSystemMetrics(SM_CXICON); tpu2e*n-|  
  int cyIcon = GetSystemMetrics(SM_CYICON); URU,&gy=  
  CRect rect; 0U|t@&q  
  GetClientRect(&rect); j/.$ (E   
  int x = (rect.Width() - cxIcon + 1) / 2; \ #<.&`8B  
  int y = (rect.Height() - cyIcon + 1) / 2; EQe!&;   
  // Draw the icon "NEg]LB5  
  dc.DrawIcon(x, y, m_hIcon); 8T6LD  
 } ^*s DJ #  
 else wcr3ugvT  
 { b-? wJSf|  
  CDialog::OnPaint(); eS#kDa/ %  
 } 5Ku=Xzvq  
} & -r^Q  
krqz;q-p~  
HCURSOR CCaptureDlg::OnQueryDragIcon() S!+c1q: ].  
{ kN7 J Z12  
 return (HCURSOR) m_hIcon; _y>mmE   
} SeuC7!q{  
+cH,2^&  
void CCaptureDlg::OnCancel() di.yh3N$  
{ -R %T Dx  
 if(bTray) 9mE6Cp.Wv  
  DeleteIcon(); LSewMj  
  CDialog::OnCancel(); pK`1pfih  
} W X"iDz.  
r<'ni  
void CCaptureDlg::OnAbout() G47(LE"2b  
{ !8g419Yg  
 CAboutDlg dlg; L`'#}#O l  
 dlg.DoModal(); 8;PS>9<  
} rA+UftC:p6  
SEfRU`  
void CCaptureDlg::OnBrowse() r]q;>\T'  
{ f^JiaU4 [  
 CString str; 5(wmy-x\  
 BROWSEINFO bi; @!p bR(8  
 char name[MAX_PATH]; LZ#=Ks  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); pbCj ^  
 bi.hwndOwner=GetSafeHwnd(); 7gWT[  
 bi.pszDisplayName=name; j1zrjhXI  
 bi.lpszTitle="Select folder"; DWv(|gO  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Lql2ry$Wa  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4^r4O#  
 if(idl==NULL) TWzlF>4N  
  return; J`6IH#54  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zH"a>+st=  
 str.ReleaseBuffer(); }K .Rv(m  
 m_Path=str; R*[X. H  
 if(str.GetAt(str.GetLength()-1)!='\\') 9Lus,l\  
  m_Path+="\\"; :g%hT$,]3b  
 UpdateData(FALSE); WCNycH+1  
} zA%YaekJ  
mkE_ a>  
void CCaptureDlg::SaveBmp() Sp7VH+  
{ R$XHjb)  
 CDC dc; _0cCTQE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); A<h^.{  
 CBitmap bm; O2pntKI  
 int Width=GetSystemMetrics(SM_CXSCREEN); q t(+X  
 int Height=GetSystemMetrics(SM_CYSCREEN); Hs:0j$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); sL Kk1A  
 CDC tdc; L< XAvg  
 tdc.CreateCompatibleDC(&dc); =K)[3mX X  
 CBitmap*pOld=tdc.SelectObject(&bm); -F. c<@*E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eA{ nwtN  
 tdc.SelectObject(pOld); a8WWFAC[  
 BITMAP btm; Y#,&Tu  
 bm.GetBitmap(&btm); Pz^C3h$5_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  -uKTEG[  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~'V&[]nh8  
 BITMAPINFOHEADER bih; 0 k.\o"y  
 bih.biBitCount=btm.bmBitsPixel; >D jJ*vM  
 bih.biClrImportant=0; E2xK GK   
 bih.biClrUsed=0; PglSQ2P  
 bih.biCompression=0;  )[S#:PP  
 bih.biHeight=btm.bmHeight; r>e1IG  
 bih.biPlanes=1; $7QGi|W*k  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,i jB3J  
 bih.biSizeImage=size; k vpkWD;  
 bih.biWidth=btm.bmWidth; l4gF.-.GYF  
 bih.biXPelsPerMeter=0; 2tb+3K1  
 bih.biYPelsPerMeter=0; HA J[Y3d<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gSa!zQN6  
 static int filecount=0; {/FdrS  
 CString name; >\!G43Q=  
 name.Format("pict%04d.bmp",filecount++); /Rf,Rjs  
 name=m_Path+name; (@1>G ^%  
 BITMAPFILEHEADER bfh; CnpQdI  
 bfh.bfReserved1=bfh.bfReserved2=0; fsl ZJE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~.tl7wKkR/  
 bfh.bfSize=54+size; \.aKxj5  
 bfh.bfOffBits=54; 4tEAi4H|`@  
 CFile bf; NXk~o!D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -Qn l)JB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4VHWoN"U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VFrp7;z43  
  bf.WriteHuge(lpData,size); v8YF+N  
  bf.Close(); }4g$ aTc  
  nCount++; J(G-c5&=  
 } y| 0!sNg  
 GlobalFreePtr(lpData); <vE|QxpR  
 if(nCount==1) yH(3 m#  
  m_Number.Format("%d picture captured.",nCount); q@G}Hjn  
 else bv;. 6C(T<  
  m_Number.Format("%d pictures captured.",nCount); NEUr w/  
  UpdateData(FALSE); e^<'H  
} gyQPQ;"H$2  
!4a#);`G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S"VO@)d  
{ G|*&owJ  
 if(pMsg -> message == WM_KEYDOWN) 67;6nXG0K  
 { l^XOW- ;u  
  if(pMsg -> wParam == VK_ESCAPE) No8-Hm  
   return TRUE; d A'0'M  
  if(pMsg -> wParam == VK_RETURN) Bq;GO  
   return TRUE; d[{!^,%x"  
 }  ZC%;5O`  
 return CDialog::PreTranslateMessage(pMsg); o!ZG@k?#  
}  m^\&v0  
<-mhz`^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NBXhcfF  
{ 0x,**6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2z.~K&+x  
  SaveBmp(); )QW hzY  
  return FALSE; a)4%sX*I  
} .EPv4[2%F8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Qqi?DW1)-  
 CMenu pop; Z4X, D`s  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l1#.r g  
 CMenu*pMenu=pop.GetSubMenu(0); qqJghV$Oj  
 pMenu->SetDefaultItem(ID_EXITICON); hH9~.4+*`g  
 CPoint pt; eZ$M#I=o  
 GetCursorPos(&pt); Sgr. V)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^D]J68)#a  
 if(id==ID_EXITICON) blWtC/!Aq;  
  DeleteIcon(); H|0-Al.{  
 else if(id==ID_EXIT) /k[8xb  
  OnCancel(); ?S'aA !/;  
 return FALSE; >S-JAPuO  
} v`c;1?=,q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); eh%{BXW[p  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @`#x:p:  
 AddIcon(); hj&~Dn(  
 return res; z` YC3_d  
} 5*f54g"'  
mlCBstt{  
void CCaptureDlg::AddIcon() L }3eZ-  
{ d``wx}#Uk  
 NOTIFYICONDATA data; tot~\S  
 data.cbSize=sizeof(NOTIFYICONDATA); 6uv~.-T<l  
 CString tip; *Ojl@N  
 tip.LoadString(IDS_ICONTIP); L+VQtp &"  
 data.hIcon=GetIcon(0); ?E_;[(Mcr  
 data.hWnd=GetSafeHwnd(); nbB*d@"  
 strcpy(data.szTip,tip); 0WfnX>(C7R  
 data.uCallbackMessage=IDM_SHELL; 1hlU 6 =Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]DU?N7J  
 data.uID=98; $M j\ 3  
 Shell_NotifyIcon(NIM_ADD,&data); [Y$ TVwFwX  
 ShowWindow(SW_HIDE); mBJr*_p  
 bTray=TRUE; R8:5N3Fx  
} jV9oTH-  
qp)Wt6 k?  
void CCaptureDlg::DeleteIcon() BVj(Q}f8  
{ liG|#ny{  
 NOTIFYICONDATA data;  sa&`CEa  
 data.cbSize=sizeof(NOTIFYICONDATA); O_ZYm{T[7  
 data.hWnd=GetSafeHwnd(); : 8j7}'  
 data.uID=98; p!8phS#iP  
 Shell_NotifyIcon(NIM_DELETE,&data); Xtfs)"  
 ShowWindow(SW_SHOW); +Z2XP76(4A  
 SetForegroundWindow(); x;sc?5_`  
 ShowWindow(SW_SHOWNORMAL); u#rbc"  
 bTray=FALSE; a|= ^   
} vG.KSA  
 BdiV  
void CCaptureDlg::OnChange() ~ +>e hU  
{ S6_:\Q  
 RegisterHotkey(); a$h^<D ^  
} mhX66R  
WR`NISSp  
BOOL CCaptureDlg::RegisterHotkey() J^ewG  
{ 7H?xp_D  
 UpdateData(); 4Ngp  -  
 UCHAR mask=0; j}B86oX  
 UCHAR key=0; yci}#,nb  
 if(m_bControl) +}M3O]?4  
  mask|=4; `'^o45  
 if(m_bAlt) ;x 2o|#`b  
  mask|=2; oGB|k]6]|  
 if(m_bShift) {l5fKVb\C  
  mask|=1; <xF]ca  
  key=Key_Table[m_Key.GetCurSel()]; $2}#):`  
 if(bRegistered){ JB].ht  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @{q<"hT  
  bRegistered=FALSE; !zx8I7e4  
 } *!JB^5(H  
 cMask=mask; L@/IyQ[H1  
 cKey=key; 5-$D<}Z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); b=1E87i@W  
 return bRegistered; \lm]G7h  
} @tY]=pqn_  
'fGKRd|)  
  四、小结 UOf\pG  
7n.Oem  
  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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