社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 4731阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: KFG^vmrn  
  _BaS\U%1(  
  一、实现方法 " yl"A4p S  
`X03Q[: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: n&{N't  
R,Uy3N  
#pragma data_seg("shareddata") g {wPw  
HHOOK hHook =NULL; //钩子句柄 j`M<M[C*4N  
UINT nHookCount =0; //挂接的程序数目 %pKs- n`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (&x\,19U$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 J3E:r_+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u+FftgA  
static int KeyCount =0; aVL%-Il}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xH-k~#  
#pragma data_seg() (?wKBUi  
*njB fH'  
  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。 bv"({:x  
Bm>(m{sX>  
  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: iEO2Bil]  
EB<tX`Wp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR f3|=T8"t  
cKey,UCHAR cMask) Q#bo!]H{t  
{ *3oQS"8  
 BOOL bAdded=FALSE; oQB1fs  
 for(int index=0;index<MAX_KEY;index++){ 'B:De"_(N  
  if(hCallWnd[index]==0){ Q%d[ U4@  
   hCallWnd[index]=hWnd; *#9kFz-  
   HotKey[index]=cKey; Ykq }9  
   HotKeyMask[index]=cMask; X2kLbe  
   bAdded=TRUE; {D.0_=y~2  
   KeyCount++; teALd~;  
   break; < VsZ$  
  } ~/[N)RFD  
 } ds[~Cp   
 return bAdded; ZWW}r~d{  
} pDN,(Ip  
//删除热键 #>NZN1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1S@k=EKM  
{ (G'ddZAJV  
 BOOL bRemoved=FALSE; ,urkd~  
 for(int index=0;index<MAX_KEY;index++){ :Dm@3S$4<  
  if(hCallWnd[index]==hWnd){ 8)ol6Mi{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l8li@K  
    hCallWnd[index]=NULL; j* ja)  
    HotKey[index]=0; DzOJ{dF  
    HotKeyMask[index]=0; :fUmMta  
    bRemoved=TRUE; ?7s  
    KeyCount--; M" \y2   
    break; ovVU%2o1b  
   } AIo;\35  
  } |%9~W^b  
 } [a6lE"yr  
 return bRemoved; 3F3?be  
} >0$5H]1u  
>H! 2Wflm  
bsVOO9.4-  
  DLL中的钩子函数如下: L2tmo-]nw  
%QkvBg*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XRin~wz|S  
{ b6VAyTa  
 BOOL bProcessed=FALSE; 1Qkuxw  
 if(HC_ACTION==nCode) 3g?T,| 2K  
 { 8ttw!x69)_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Ric$Xmu  
   switch(wParam) #SOe &W5  
   {  4QDzG~N4)|  
    case VK_MENU: 9`b3=&i\  
     MaskBits&=~ALTBIT; o!&*4>tF  
     break; )A"7l7?.n)  
    case VK_CONTROL: :W55JD'  
     MaskBits&=~CTRLBIT; BJTljg( {o  
     break; XoOe=V?I )  
    case VK_SHIFT: c Ix(;[U  
     MaskBits&=~SHIFTBIT; KcE=m\h  
     break; J0o[WD$A x  
    default: //judge the key and send message U[u6UG  
     break; tL|Q{+i yE  
   } W[ DB !ue  
   for(int index=0;index<MAX_KEY;index++){ [ j_jee  
    if(hCallWnd[index]==NULL) YN3uhd[2  
     continue; p`0Tpgi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l0V@19Ec  
    { N*;/~bt7 P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H(|v  
     bProcessed=TRUE; #{a<{HX  
    } (C|%@61S  
   } zyE yZc?  
  } v%w]Q B  
  else if((lParam&0xc000ffff)==1){ //有键按下 fk_i~K  
   switch(wParam) .l!Z=n|  
   { Adm`s .  
    case VK_MENU: 9`{cX  
     MaskBits|=ALTBIT; 'rgV]Oy  
     break; vJs /ett  
    case VK_CONTROL: 7 #`:m|$  
     MaskBits|=CTRLBIT; O5w\oDhMb  
     break; *{bqHMd4L  
    case VK_SHIFT: 7dRU7p>  
     MaskBits|=SHIFTBIT; uq_SF.a'v  
     break; "k/x+%!Spc  
    default: //judge the key and send message nNr3'6lz  
     break; BH1To&ol  
   } Kk#@8h>  
   for(int index=0;index<MAX_KEY;index++){ wO9<An  
    if(hCallWnd[index]==NULL) Z'~FZRF  
     continue; t<=L&:<N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I&9B^fF6  
    { 1['A1 ,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c1f6RCu$b  
     bProcessed=TRUE; '_%Jw:4k  
    } 1Ppzch7  
   } }9JPSl28Jr  
  } -K{ID$!p  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !~#31kL&  
   for(int index=0;index<MAX_KEY;index++){ q]aRJ`9f  
    if(hCallWnd[index]==NULL) [S%  
     continue; t+VPX2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _e W*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  S_atEmQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ZL Aq8X  
   } 3 ren1   
  } U7N<!6  
 } HD>{UU?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); utXcfKdt  
} e:]$UAzp  
!WmpnPr1  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 9z?F_=PB!  
K':f!sZ&2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RDbA"e5x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _gHJ4(?w  
KRQ/wuv  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: |cacMgly  
>; Bhl|r~z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F&\o1g-L  
{ {XAKf_Cg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H0S7k`.  
 { #r C% \  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 K{c^.&6D  
  SaveBmp(); 2;3q](d   
  return FALSE; N=kACEo  
 } ^s-3U  
 …… //其它处理及默认处理 kF5}S8B  
} xiiZ'U  
p ,!`8c6  
DI\^ +P  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 9f "*O j  
CfAqMH*ip  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 0t~--/lA  
x8H)m+AW  
  二、编程步骤 Hi9]M3Ub  
l/]P6 @N  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Kfi A 7W  
cb+!H>+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; R#t~i&v/  
<:p&P  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; /[IK [  
P_;oSN|>  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; LZeR .8XM>  
;rFa I^  
  5、 添加代码,编译运行程序。 srC jq  
1yo@CaW[\  
三、程序代码 ;RrfE8mGj  
# a3Q<%V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL H/b(dbs  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) yP@= x!$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ } E=mZZ)  
#if _MSC_VER > 1000 lIf Our  
#pragma once j6\{j#q  
#endif // _MSC_VER > 1000 o)$sZ{` ="  
#ifndef __AFXWIN_H__ 67e1Y@Xu  
#error include 'stdafx.h' before including this file for PCH ]KfHuYjM  
#endif ,Ya&M@^Z  
#include "resource.h" // main symbols 0YS*=J"7z  
class CHookApp : public CWinApp q*T+8 O  
{ cc>h=%s`  
 public: -{O2Nv-]]  
  CHookApp(); oyHjdPdY#  
  // Overrides  j>6{PDaT  
  // ClassWizard generated virtual function overrides H;^6%HV1  
  //{{AFX_VIRTUAL(CHookApp) h'bxgIl'`  
 public: @/9> /?JP  
  virtual BOOL InitInstance(); zIL.R#|D=  
  virtual int ExitInstance(); {3;4=R3  
  //}}AFX_VIRTUAL W&"FejD  
  //{{AFX_MSG(CHookApp) f; 22viE  
  // NOTE - the ClassWizard will add and remove member functions here. WN0^hDc-  
  // DO NOT EDIT what you see in these blocks of generated code ! m?csake.Me  
  //}}AFX_MSG wiutUb Y  
  DECLARE_MESSAGE_MAP() ' ft  |  
}; X9P-fF?0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); R(:q^?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )a.U|[:y[+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `a J[ !O  
BOOL InitHotkey(); 2@ad! h  
BOOL UnInit(); -Oo$\=d  
#endif ;c'jBi5W  
F8pLA@7[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. | o?@Eh  
#include "stdafx.h" /5o~$S  
#include "hook.h" /q>"">  
#include <windowsx.h> @M(vaJB8u  
#ifdef _DEBUG hGpaHY>My  
#define new DEBUG_NEW L 0|u^J  
#undef THIS_FILE rR7}SEa  
static char THIS_FILE[] = __FILE__; m1(rAr1  
#endif dkXK0k  
#define MAX_KEY 100 )'qZ6%  
#define CTRLBIT 0x04 s^ 6S{XJ  
#define ALTBIT 0x02 Tx!mW-Lt  
#define SHIFTBIT 0x01 K <0ItN v  
#pragma data_seg("shareddata") p1Els /|  
HHOOK hHook =NULL; S]<Hx_[}  
UINT nHookCount =0; NZ Xmrc{S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :+u?A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT U*6r".sz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [1s B  
static int KeyCount =0; rc"Z$qU?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U#Ud~Q q  
#pragma data_seg() t]Oxo`h=  
HINSTANCE hins; kefQH\<X  
void VerifyWindow(); ?&N JN/+%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #vIF]Y  
//{{AFX_MSG_MAP(CHookApp) xL mo?Y*  
// NOTE - the ClassWizard will add and remove mapping macros here. fFsA[@5tul  
// DO NOT EDIT what you see in these blocks of generated code! lc*<UZR  
//}}AFX_MSG_MAP aK,G6y  
END_MESSAGE_MAP() P2lj#aQLS  
KF-n_:Bd+  
CHookApp::CHookApp() E")82I  
{ |n~- LH++  
 // TODO: add construction code here, -{ZRk[>Z  
 // Place all significant initialization in InitInstance <Q%\ pAP}b  
} (pAGS{{  
l2$6ojpo  
CHookApp theApp; Peb;XI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dC)@v]#h  
{ GUMO;rZs  
 BOOL bProcessed=FALSE;  snX5mD  
 if(HC_ACTION==nCode) z0c_&@uj*  
 { rR/PnVup  
  if((lParam&0xc0000000)==0xc0000000){// Key up >R :Bkf-  
   switch(wParam) Z5+qb  
   { './s'!Lj  
    case VK_MENU: (A?/D!y  
     MaskBits&=~ALTBIT; 3C5<MxtK  
     break; edA.Va|0  
    case VK_CONTROL: )y._]is)b  
     MaskBits&=~CTRLBIT; x%0Q W  
     break; iEnDS@7  
    case VK_SHIFT: m&fm<?|  
     MaskBits&=~SHIFTBIT; 58WL8xu  
     break; ?&"-y)FG  
    default: //judge the key and send message q*52|?  
     break; @<;0 h|  
   } O9jqeF`L=  
   for(int index=0;index<MAX_KEY;index++){ ]x?`&f8i  
    if(hCallWnd[index]==NULL) RH~KaV3  
     continue; 10t9Qv/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S)p1[&" M  
    { 3s"x{mtH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 81`-xVd  
     bProcessed=TRUE; ;jS~0R  
    } I)T]}et  
   } Ub0g{   
  } iku) otUc  
  else if((lParam&0xc000ffff)==1){ //Key down aO6w :IO  
   switch(wParam) {4\(HrGNk  
   { %i$]S`A}  
    case VK_MENU: 'f]\@&Np  
     MaskBits|=ALTBIT; BlMc<k  
     break; k\I+T~~xD  
    case VK_CONTROL: S}mqK|!  
     MaskBits|=CTRLBIT; Q`'w)aV  
     break; g"^<LX-  
    case VK_SHIFT: fn]f$n*`  
     MaskBits|=SHIFTBIT; ``DS?pUY  
     break; F^z&s]^~  
    default: //judge the key and send message 9F@Q  
     break; CB\E@u,  
   } n](Q)h'nlo  
   for(int index=0;index<MAX_KEY;index++) "'~55bG  
   { .gzNdSE  
    if(hCallWnd[index]==NULL) ZxLgV$U  
     continue; {L4ta~2/T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E:!?A@Fy  
    { 5Z@OgR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *;5P65:u$>  
     bProcessed=TRUE; cA m>f[  
    } /J9|.];%r  
   } {d|e@`"T  
  } 2guWWFS  
  if(!bProcessed){ %L,mj  
   for(int index=0;index<MAX_KEY;index++){ L/t'|<m  
    if(hCallWnd[index]==NULL) iK%%  
     continue; lpi^<LQ@l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) __O@w.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w7+3?'L  
   } OXAr..  
  } AU0pJB'  
 } 8A}cxk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @|BaZq,g  
} Po_y7 8ZD  
`o4alK\  
BOOL InitHotkey() qp;eBa  
{ G |033(j  
 if(hHook!=NULL){ Y)lYEhF  
  nHookCount++; DPqk~KCM  
  return TRUE; RzgA;ZC'  
 } .ww~'5b0  
 else :|%k*z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %zsY=qT  
  if(hHook!=NULL) ,}?x!3  
   nHookCount++; c%tb6@C  
  return (hHook!=NULL); % s&l^&ux  
} 1<766  
BOOL UnInit() h0ml#A`h  
{ uI lm!*0  
 if(nHookCount>1){ F`))qCgg]  
  nHookCount--; OpWTw&B"+  
  return TRUE; \%[sv@P9s  
 } $S Kax#[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _3YZz$07  
 if(unhooked==TRUE){ jjLx60|{  
  nHookCount=0; oU"!"t  
  hHook=NULL; ~FCkr&Ky3  
 } u2\QhP 9  
 return unhooked; apy9B6%PJ+  
} j AXKp b  
9+S$,|9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KUD&vqx3  
{ d%?$UnQ  
 BOOL bAdded=FALSE; v%^"N_]  
 for(int index=0;index<MAX_KEY;index++){ dA 03,s  
  if(hCallWnd[index]==0){ lW6$v* s9  
   hCallWnd[index]=hWnd; xfegi$  
   HotKey[index]=cKey; EnW}>XN  
   HotKeyMask[index]=cMask; [P_@-:(O  
   bAdded=TRUE; g  Z!q  
   KeyCount++; Fw.df<  
   break; mQd L"caA  
  } z.Y`"B'j`  
 } K)DpC*j  
 return bAdded; J> Z.2  
} !pT i.3  
@'IRh9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5TynAiSD_>  
{ 1|bg;X9+  
 BOOL bRemoved=FALSE; ^GL>xlZ(  
 for(int index=0;index<MAX_KEY;index++){ Ar{7H)V:  
  if(hCallWnd[index]==hWnd){ Rq@M~;p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (Y!{ UNq5  
    hCallWnd[index]=NULL; +YD_ L  
    HotKey[index]=0; 0)Nu  
    HotKeyMask[index]=0; +%sMd]$,n  
    bRemoved=TRUE; /Pv dP#!  
    KeyCount--; CNMcQP  
    break; VPi*9(LS  
   } &d sXK~9M>  
  } KATu7)e&~^  
 } oU`{6 ~;  
 return bRemoved; 2p|ed=ly%  
} )JA9bR <  
y?Cq{(  
void VerifyWindow() ,azBk`$iQr  
{ v{r,Wy3  
 for(int i=0;i<MAX_KEY;i++){ nI_UL  
  if(hCallWnd!=NULL){ 0+{CN|0  
   if(!IsWindow(hCallWnd)){ 8.WZC1N  
    hCallWnd=NULL; [x[ nTIg  
    HotKey=0; ;)Fc@OXN>  
    HotKeyMask=0; W @ ?*~  
    KeyCount--; Fswr @du  
   } Qo\+FkhYq  
  } 1[:tiTG|C  
 } ,hSTR)  
} +?9. &<?  
O_ 4 j"0  
BOOL CHookApp::InitInstance() G0h/]%I  
{ A<p6]#t#X)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qxbGUyH==  
 hins=AfxGetInstanceHandle(); T/$hN hQK  
 InitHotkey(); FKWL{"y  
 return CWinApp::InitInstance(); wN]]t~K)Q  
} ]5a,%*f+  
1fMl8[!JLu  
int CHookApp::ExitInstance() XMlcY;W  
{ b|Sjh;  
 VerifyWindow(); ?v,4seRuz  
 UnInit(); S;tv4JY  
 return CWinApp::ExitInstance(); lvp8{]I<  
} >Q#\X=a>  
zvOSQxGQ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file + 'V ,z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HDHC9E6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ihy76_OZ  
#if _MSC_VER > 1000 ~0V,B1a  
#pragma once ,Pj UlcO_  
#endif // _MSC_VER > 1000 I?OnEw  
Y^2]*e%  
class CCaptureDlg : public CDialog  ovsI2  
{ w%?6s3   
 // Construction AQgagE^  
 public: z8JdA%YBM  
  BOOL bTray;  j|owU  
  BOOL bRegistered; \O=t5yS  
  BOOL RegisterHotkey(); }@TtX\7(D  
  UCHAR cKey; @+&QNI06S  
  UCHAR cMask; A(1d q  
  void DeleteIcon(); P$i d?  
  void AddIcon(); w,VUWja  
  UINT nCount; 1kczlTF  
  void SaveBmp(); ~]78R!HJ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <G60R^o  
  // Dialog Data DAVgP7h'  
  //{{AFX_DATA(CCaptureDlg) ^3lEfI<pBm  
  enum { IDD = IDD_CAPTURE_DIALOG }; !Ct'H1J-  
  CComboBox m_Key; 94'0X  
  BOOL m_bControl; ^GC 8^f  
  BOOL m_bAlt; s)5W:`MH?  
  BOOL m_bShift; ueP a4e!  
  CString m_Path; + 0 |d2_]E  
  CString m_Number; G F17oMi  
  //}}AFX_DATA ?TMrnR/d  
  // ClassWizard generated virtual function overrides Al^h^ 9tJ  
  //{{AFX_VIRTUAL(CCaptureDlg) h e1=  
 public: \(;X3h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8/T,.<5  
 protected: l'FNp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M ]uO%2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I%tJLdL  
  //}}AFX_VIRTUAL zC|y"PTw  
  // Implementation (aX6jdvo  
 protected: xB|?}uS-  
  HICON m_hIcon; xC YL3hl  
  // Generated message map functions |#J!oBS!  
  //{{AFX_MSG(CCaptureDlg) JG*Lc@Q  
  virtual BOOL OnInitDialog(); M?.[Rr-uw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r8TNl@Z  
  afx_msg void OnPaint(); us>$f20T  
  afx_msg HCURSOR OnQueryDragIcon(); gaVQ3NqF  
  virtual void OnCancel(); cUD}SOW  
  afx_msg void OnAbout(); A5kz(pj  
  afx_msg void OnBrowse(); 'D[g{LkL  
  afx_msg void OnChange(); CAtdx!  
 //}}AFX_MSG TKrh3   
 DECLARE_MESSAGE_MAP() D)GD9MJ  
}; -iySU 6  
#endif vJfj1 f  
pa2cM%48  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *,#T&M7D  
#include "stdafx.h" [*z`p;n2D  
#include "Capture.h" o}6d[G>  
#include "CaptureDlg.h" B`/p[U5  
#include <windowsx.h> ,#hx%$f}d  
#pragma comment(lib,"hook.lib") BiI`oCX  
#ifdef _DEBUG {N`<TH PP  
#define new DEBUG_NEW c5AEn -Q  
#undef THIS_FILE L%5g]=  
static char THIS_FILE[] = __FILE__; }1? 2  
#endif /5r!Fhx  
#define IDM_SHELL WM_USER+1 yQdoy^d/4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I1fUV72  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e>Q_&6L  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; gvy c(d  
class CAboutDlg : public CDialog ~spfQV~  
{ 'J(B{B7|  
 public: SJsRHQ  
  CAboutDlg(); PNG!q}(c  
  // Dialog Data L0EF CQ7  
  //{{AFX_DATA(CAboutDlg) {/K_NSg+h  
  enum { IDD = IDD_ABOUTBOX }; ~[3B<^e  
  //}}AFX_DATA /p7-D;  
  // ClassWizard generated virtual function overrides `uLH3sr  
  //{{AFX_VIRTUAL(CAboutDlg) Qv/Kbw N{  
 protected: 6R';[um?q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d'*:2;)g^  
  //}}AFX_VIRTUAL (f>~+-IL  
  // Implementation qb?9i-(  
 protected: A i5|N  
  //{{AFX_MSG(CAboutDlg) d,*#yzO  
  //}}AFX_MSG zqs|~W]c  
  DECLARE_MESSAGE_MAP() Av"^uevfs  
}; EjFK zx  
Bv(c`JE~;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >Qold7 M  
{ Ln@n6*%(/  
 //{{AFX_DATA_INIT(CAboutDlg) &M2SqeR62;  
 //}}AFX_DATA_INIT L6f$ID:  
} mIm.+U`a2  
hkoCbR0}8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4.qW ~ W{  
{ yVl?gGgh  
 CDialog::DoDataExchange(pDX); _|} GhdYE  
 //{{AFX_DATA_MAP(CAboutDlg) J)"g`)\2+  
 //}}AFX_DATA_MAP 7^*[ XH  
} VmTPE5d  
Kfk/pYMDq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $*z>t*{7  
 //{{AFX_MSG_MAP(CAboutDlg) #t?tt,nc}  
 // No message handlers j/PNi@  
 //}}AFX_MSG_MAP Avr2MaY{h  
END_MESSAGE_MAP() ZINqIfc  
L0dj 76'M  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) iR6w)  
: CDialog(CCaptureDlg::IDD, pParent) cgF?[Z+x  
{ oRQJ YH  
 //{{AFX_DATA_INIT(CCaptureDlg)  b@m\ca  
  m_bControl = FALSE; -3T~+  
  m_bAlt = FALSE; t8\XO j  
  m_bShift = FALSE; U6 $)e.FO  
  m_Path = _T("c:\\"); U3 y-cgE  
  m_Number = _T("0 picture captured."); i! DO  
  nCount=0; yx&'W_Q@  
  bRegistered=FALSE; +c-?1j  
  bTray=FALSE; B?p18u$i#l  
 //}}AFX_DATA_INIT Yk!TQY4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 / +9o?Kxya  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ouf91<n  
} 64w4i)?eM[  
& U6bOH%P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )MlT=k6S  
{ - }2AXP2q  
 CDialog::DoDataExchange(pDX); @ZTsl ?  
 //{{AFX_DATA_MAP(CCaptureDlg) `/\Z{j0_  
  DDX_Control(pDX, IDC_KEY, m_Key); rXG?'jN  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); R0_O/o+{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )[d>?%vfd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "l.1 UB&  
  DDX_Text(pDX, IDC_PATH, m_Path); 41Htsj  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l-G] jXu  
 //}}AFX_DATA_MAP dzn[4  
} csNB  \  
Mpu8/i gX,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \.,qAc\[  
//{{AFX_MSG_MAP(CCaptureDlg) U-0A}@N  
 ON_WM_SYSCOMMAND() ^;=L|{Xl  
 ON_WM_PAINT() Ln C5"  
 ON_WM_QUERYDRAGICON() w!N?:}P<N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F,'rW:{HMt  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1@L|EFa  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :d,]BB  
//}}AFX_MSG_MAP j!;y!g  
END_MESSAGE_MAP() :^[HDI-[2  
Kfl#78$d  
BOOL CCaptureDlg::OnInitDialog() Z<^TO1xs9B  
{ 6 7{>x[  
 CDialog::OnInitDialog(); @ky<5r*JU(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  ]H_|E  
 ASSERT(IDM_ABOUTBOX < 0xF000); TEYn^/n~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {'e%Hx  
 if (pSysMenu != NULL) x{.+i'  
 { H@%Y"iIUP  
  CString strAboutMenu; W{z{AxS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4IH,:w=ofN  
  if (!strAboutMenu.IsEmpty()) p ! _\a  
  { H:jx_  
   pSysMenu->AppendMenu(MF_SEPARATOR); {ICW"R lcs  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d?Y|w3lB  
  } EBl?oN7E  
 } }aC@ov]2  
 SetIcon(m_hIcon, TRUE); // Set big icon j68_3zpl  
 SetIcon(m_hIcon, FALSE); // Set small icon 7\xGMCctM  
 m_Key.SetCurSel(0); ~vMdIZ.h  
 RegisterHotkey(); Nt5`F@;B  
 CMenu* pMenu=GetSystemMenu(FALSE); Hz6tk9;w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); r3_O?b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); q }'ww  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~?#B(t  
 return TRUE; // return TRUE unless you set the focus to a control +91j 1?  
} VvSe`E*  
*eLKD_D`!C  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X@ j.$0 eK  
{ k6b0&il  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @V>BG8Y  
 { jFr[T  
  CAboutDlg dlgAbout; d%wy@h  
  dlgAbout.DoModal(); bh&Wy<Y  
 } 8M,AFZ>F  
 else :psP|7%|  
 { ?n0Z4 8%  
  CDialog::OnSysCommand(nID, lParam); l1?$quM^V  
 } >&g^ `  
} 0!fT:Ra  
1;8%\r[|5^  
void CCaptureDlg::OnPaint() B2/d%B  
{ Q2(K+!Oe  
 if (IsIconic()) ^/V>^9CZ  
 { !`h^S)$  
  CPaintDC dc(this); // device context for painting >nqCUhS   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iS]4F_|vd  
  // Center icon in client rectangle jr`;H  
  int cxIcon = GetSystemMetrics(SM_CXICON); U-mZO7y!  
  int cyIcon = GetSystemMetrics(SM_CYICON); YooP HeQ  
  CRect rect; Vhi4_~W3j]  
  GetClientRect(&rect); DY(pU/q  
  int x = (rect.Width() - cxIcon + 1) / 2; h%*@82DKK  
  int y = (rect.Height() - cyIcon + 1) / 2; r|,_qNrw  
  // Draw the icon dvX[,*wz  
  dc.DrawIcon(x, y, m_hIcon); I)YUGA5  
 } j'QPJ(`~1l  
 else K}j["p<!  
 { aB*'DDlx"r  
  CDialog::OnPaint(); wdo(K.m  
 } 99G'`NO  
} gL(_!mcwu  
LjEG1$F>  
HCURSOR CCaptureDlg::OnQueryDragIcon() , R;k>'.  
{ :Q-QY)hH  
 return (HCURSOR) m_hIcon; =Sp+$:q*  
} FBP'AL|  
t3(~aH  
void CCaptureDlg::OnCancel() JLn)U4>z w  
{ Krw'|<  
 if(bTray) <<M1:1  
  DeleteIcon(); LyuA("xB#  
  CDialog::OnCancel(); &`^P O $  
} FD[o94`%  
3"O&IY<  
void CCaptureDlg::OnAbout() L}M%z9K` h  
{ fuQk}OW{  
 CAboutDlg dlg; Hq;*T3E  
 dlg.DoModal(); ?;xL]~Q~1  
} epm ~  
Mc@_[q!xY?  
void CCaptureDlg::OnBrowse() 6F8TiR&  
{ vi; yT.  
 CString str; _X]\#^UiO2  
 BROWSEINFO bi; 6'[gd  
 char name[MAX_PATH]; ]VcuD05"C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); l&Cy K#B:\  
 bi.hwndOwner=GetSafeHwnd(); F(DM$5z[  
 bi.pszDisplayName=name; ]]eI80u[  
 bi.lpszTitle="Select folder"; |QHIB?C?`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Bag_0.H&m  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Is[n7Q  
 if(idl==NULL) @=NTr  
  return; G vTA/zA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C-sFTf7  
 str.ReleaseBuffer(); ^9zlxs`<d  
 m_Path=str; U)6Ew4uRxV  
 if(str.GetAt(str.GetLength()-1)!='\\') \ !qe@h<  
  m_Path+="\\"; $g&_7SJ@  
 UpdateData(FALSE); yW]>v>l:Eg  
} H g04pZupN  
U9Gg#M4tY  
void CCaptureDlg::SaveBmp() vtw97G  
{ ecMpU8}rR  
 CDC dc; Ie7S'.Lmq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !%/2^  
 CBitmap bm; .Mxt F\  
 int Width=GetSystemMetrics(SM_CXSCREEN); 49tJ+J-N  
 int Height=GetSystemMetrics(SM_CYSCREEN); A)80qx:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Uo0[ZsFD  
 CDC tdc; =: =s  
 tdc.CreateCompatibleDC(&dc); sUk&NM%>  
 CBitmap*pOld=tdc.SelectObject(&bm); &~'^;hy=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P%y9fU2[  
 tdc.SelectObject(pOld); ?Ll1B3f  
 BITMAP btm; 95.s,'0  
 bm.GetBitmap(&btm); hH]oJ}H \  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t;b1<TLn0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5;CqGzgoP  
 BITMAPINFOHEADER bih; >>T,M@s-:  
 bih.biBitCount=btm.bmBitsPixel; nU23D@l  
 bih.biClrImportant=0; B,4 3b O  
 bih.biClrUsed=0; ,E &W{b  
 bih.biCompression=0; PnJA'@x  
 bih.biHeight=btm.bmHeight; !N74y%=M  
 bih.biPlanes=1; f3SAK!V+s  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8E|FFHNK<2  
 bih.biSizeImage=size; Bp/ k{7  
 bih.biWidth=btm.bmWidth; bo &QKK  
 bih.biXPelsPerMeter=0; 4hWFgk  
 bih.biYPelsPerMeter=0; TUX:[1~Nf[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q22@ZRw  
 static int filecount=0; ekCt1^5Y  
 CString name; &\W5|*`x-  
 name.Format("pict%04d.bmp",filecount++); /xb37,   
 name=m_Path+name; gJg%3K~,  
 BITMAPFILEHEADER bfh; $xK(bc'{  
 bfh.bfReserved1=bfh.bfReserved2=0; ,GMuq_H  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 50^CILKo7  
 bfh.bfSize=54+size; A"wso[{  
 bfh.bfOffBits=54; SN5Z@kK  
 CFile bf; rU_FRk  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 98Im/v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); SD.c 9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); K_}81|=  
  bf.WriteHuge(lpData,size); ^:2>I$  
  bf.Close(); b4CXif  
  nCount++; (Eo#oX  
 } D6:"k 2  
 GlobalFreePtr(lpData); ]ZS/9 $  
 if(nCount==1) uWkuw5;  
  m_Number.Format("%d picture captured.",nCount); 7 aN}l QM  
 else 1Ba.'~:  
  m_Number.Format("%d pictures captured.",nCount); w -5_Ru  
  UpdateData(FALSE); Qy\K oo  
} e^h4cC\^  
'<aFd)-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lTZcbaO?]  
{ xz){RkVzP  
 if(pMsg -> message == WM_KEYDOWN) @O| l A  
 { !$!"$-5  
  if(pMsg -> wParam == VK_ESCAPE) `r+`vJ$  
   return TRUE; ]64?S0p1c!  
  if(pMsg -> wParam == VK_RETURN) Q@- h  
   return TRUE; H1e^/JD)  
 } T;pe7"  
 return CDialog::PreTranslateMessage(pMsg); }^ZPah  
} 2rqYm6  
84y#L[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2KQpmNN  
{ dUP8[y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ RQW<Sp~  
  SaveBmp(); YA@OA$`E  
  return FALSE; 6@J)k V  
} p} i5z_tS  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ aWMEo`O%  
 CMenu pop; 3k* U/*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FQw@ @  
 CMenu*pMenu=pop.GetSubMenu(0); gro@+^DmT  
 pMenu->SetDefaultItem(ID_EXITICON); 7_]Bu<{f  
 CPoint pt; K Z Q `  
 GetCursorPos(&pt); ?OdJ t  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fMIKA72>{  
 if(id==ID_EXITICON) qW t 9Tr  
  DeleteIcon(); bS*oFm@u  
 else if(id==ID_EXIT) /;xmM 2B'  
  OnCancel(); T^.W'  
 return FALSE; `YPNVm<3)  
} =xPBolxm5U  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Y 9~z7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) usOIbrQ  
 AddIcon(); S<DS|qOo  
 return res; >TwL&la  
} P*6&0\af|  
M UqV$#4@I  
void CCaptureDlg::AddIcon() (C!33s1  
{ /@f3|L<1@V  
 NOTIFYICONDATA data; YJ~3eZQ  
 data.cbSize=sizeof(NOTIFYICONDATA); qJLtqv  
 CString tip; pax;#*QcQ  
 tip.LoadString(IDS_ICONTIP); C]DvoJmBs  
 data.hIcon=GetIcon(0); @G0j/@v  
 data.hWnd=GetSafeHwnd(); uNG?`>4>  
 strcpy(data.szTip,tip); 16n8[U!  
 data.uCallbackMessage=IDM_SHELL; [9xUMX^}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; EFS2 zU  
 data.uID=98; 3NC-)S  
 Shell_NotifyIcon(NIM_ADD,&data); (f?&zQ!+  
 ShowWindow(SW_HIDE); L\y>WR%s  
 bTray=TRUE; 2?nhkast#=  
} ;c;PNihg  
A+bU{oLr  
void CCaptureDlg::DeleteIcon() <e7  
{ [";<YR7iRN  
 NOTIFYICONDATA data; J;cTEB  
 data.cbSize=sizeof(NOTIFYICONDATA); oN " /w~  
 data.hWnd=GetSafeHwnd(); tQrkRg(E:  
 data.uID=98; xbhU:,o  
 Shell_NotifyIcon(NIM_DELETE,&data); Oa|'wh ug  
 ShowWindow(SW_SHOW);  QKtTy>5  
 SetForegroundWindow(); k-a3oLCR,  
 ShowWindow(SW_SHOWNORMAL); ,1&</R_  
 bTray=FALSE; d}RR!i`<N  
} 7!-y72qx  
63n<4VSH  
void CCaptureDlg::OnChange() Vpsv@\@J>  
{ pt+[BF6P  
 RegisterHotkey(); "8h7"WR  
} 2^C>orKQ0  
`+O7IyTM A  
BOOL CCaptureDlg::RegisterHotkey() q+Cq&|4 ?2  
{ o$_,2$>mn  
 UpdateData(); TEi~X 2u  
 UCHAR mask=0; ]M5w!O!  
 UCHAR key=0; Q`7.-di  
 if(m_bControl) ?O<D&CvB  
  mask|=4; cN\Fgbt  
 if(m_bAlt) {expx<+4F  
  mask|=2; QSq0{  
 if(m_bShift) v\:P _J  
  mask|=1; m'P,:S)=  
  key=Key_Table[m_Key.GetCurSel()]; `@07n]KB  
 if(bRegistered){ o7;#B)jWS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); jsOid5bs  
  bRegistered=FALSE; ]~1Xx:X-  
 } jjrhl  
 cMask=mask; KWH l+p L  
 cKey=key; q2C._{ 0'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `c~J&@|  
 return bRegistered; w `0m[*  
} o0'!u  
Au-h#YV  
  四、小结 WVfwt.Y  
H~Fb=.h]U  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八