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
  • 5140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: yO}RkRA  
  pdCn98}%-  
  一、实现方法 &%3$zgvR  
Fl)p^uUtl  
  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: f%r0K6p  
[>+}2-#  
#pragma data_seg("shareddata") pZ4]K xX@  
HHOOK hHook =NULL; //钩子句柄 ' *hy!f]  
UINT nHookCount =0; //挂接的程序数目 i"|="O0v5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L%4[,Rsw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P%HvL4R  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o&M2POI~q  
static int KeyCount =0; Ut"~I)S{LT  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  -)  
#pragma data_seg() n27df9L  
=R+z\`2  
  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。 dMkDNaH,  
NR3]MGBKv  
  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: xDtq@Rb}  
=apcMW(zn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #H]b Xr  
cKey,UCHAR cMask) +%yVW f  
{ !YUMAp/  
 BOOL bAdded=FALSE; #XSs.i{  
 for(int index=0;index<MAX_KEY;index++){ }*vUOQQp*  
  if(hCallWnd[index]==0){ 8Q $fXB  
   hCallWnd[index]=hWnd; )na 8a!  
   HotKey[index]=cKey; 7PE3>cD  
   HotKeyMask[index]=cMask; Vq[L4  
   bAdded=TRUE; GJlkEWs  
   KeyCount++; r8PXdNg  
   break; ;uw`6 KJ  
  } p4} ,xQzB  
 } 2Eq?^ )s  
 return bAdded; ];@"-H  
} WSA;p=_  
//删除热键 ~`J/618  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dOm`p W^  
{ Z.9 ?u;  
 BOOL bRemoved=FALSE; aDJ\%  
 for(int index=0;index<MAX_KEY;index++){ lgR;V]^YX  
  if(hCallWnd[index]==hWnd){ B^4D`0G[4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Yt^<^l77D  
    hCallWnd[index]=NULL; ym*,X@Qg^  
    HotKey[index]=0; (#zSVtZ  
    HotKeyMask[index]=0; Rx';P/F0C  
    bRemoved=TRUE; R7'a/  
    KeyCount--; Vp3r  
    break; |Ld/{&Qr  
   } vfb~S~|U6g  
  } z}XmRc_Ko  
 } <hG=0Zcr  
 return bRemoved; KIt:ytFx  
} dQhh,}  
DK2m(9/`3  
?sF<L/P0 F  
  DLL中的钩子函数如下: $i# 1<Qj  
"T>74bj_|Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K@Z K@++  
{ :]?y,e%xu,  
 BOOL bProcessed=FALSE; RRYm.dMIw  
 if(HC_ACTION==nCode) `o7m)T')  
 { 8<z]rLQw?%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }(}+I}&~  
   switch(wParam) zj G>=2  
   {  We^! (G  
    case VK_MENU: dV{N,;z  
     MaskBits&=~ALTBIT; M>Y ge~3  
     break; 1$cX` D`  
    case VK_CONTROL: [8Zq 1tU;G  
     MaskBits&=~CTRLBIT; RI,Z&kXj2o  
     break; V{51wnxT  
    case VK_SHIFT: ppv/ A4Kv  
     MaskBits&=~SHIFTBIT; Ave{ `YD  
     break; C[cNwvz  
    default: //judge the key and send message NzRpI5\.  
     break; Q~/TqG U  
   } P\"|b\O1  
   for(int index=0;index<MAX_KEY;index++){ Kv**(~FNnH  
    if(hCallWnd[index]==NULL) WU}?8\?U%  
     continue; \Qa6mt2h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^QX3p,Y  
    { WM8 Ce0E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W'2a1E  
     bProcessed=TRUE; $6p_`LD0  
    } n0o'ns  
   } \k6Ho?PL  
  } +.i?UHNB  
  else if((lParam&0xc000ffff)==1){ //有键按下 J{98x zb  
   switch(wParam) =F>@z4[P-  
   { MGUzvSf  
    case VK_MENU: 7 S^iGe  
     MaskBits|=ALTBIT; ?sb Ob  
     break; p h[ ^ve  
    case VK_CONTROL: z"`q-R }m  
     MaskBits|=CTRLBIT; 3`9H  
     break; D;@*  
    case VK_SHIFT: zu6Y*{$>g  
     MaskBits|=SHIFTBIT;  T~I5W=y  
     break; =ytB\e  
    default: //judge the key and send message '\[o>n2  
     break; kNX"Vo]1  
   } :*GLLjS;  
   for(int index=0;index<MAX_KEY;index++){ !P*1^8b`f  
    if(hCallWnd[index]==NULL) E;l|I A/7  
     continue; [qhQj\cK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +J`EBoIo  
    { \ Y[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $4yv)6G  
     bProcessed=TRUE; v?Q|;<   
    } Vc!` BiH  
   } 0Xmp)_vba  
  } !2dA8b  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a}N m;5K  
   for(int index=0;index<MAX_KEY;index++){ u!in>]^  
    if(hCallWnd[index]==NULL) 79:Wo>C3-  
     continue; mmC&xZ5f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YmP`Gg#> p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3JuWG\r)l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 dQfVdqg  
   } i#I+   
  } hdB.u^!  
 } ?`+46U%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P.bBu  
} cnm&o C 6  
:Mz$~o<  
  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: S1Q2<<[  
\79KU   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); voRr9E*n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cP[3p :  
*2O4*Q1  
  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: F.P4c:GD  
!;'. mMO&%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r&AX  
{ =2HR+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) & [)1LRt_  
 { e|:#Y^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N>z<v\`  
  SaveBmp(); b2;+a(  
  return FALSE; k/+-Tq;  
 } u|m>h(O  
 …… //其它处理及默认处理 [n/'JeG5  
} 19od# d3+  
D3#/*Ky  
%JBFG.+  
  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。 +hdD*}qauC  
4&r+K`C0  
  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。 8D[8(5  
Jd_w:H.  
  二、编程步骤 h>v;1Q O9D  
s^KUe%am0  
  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"; HC,YmO:df"  
1 h(oty2p  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uWw4l"RK`  
Skgvnmk[U  
  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; 41luFtE9  
@DgJxY|  
  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; 6Q]c]cCu  
a`5ODW+  
  5、 添加代码,编译运行程序。 D`]Lm24_]  
%OWLM  
三、程序代码 u}u;jTi> 2  
uLV@D r   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~@ZdO+n?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (uG.s%I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ QF/A-[V  
#if _MSC_VER > 1000 +pU\;x  
#pragma once =PXQ X(_  
#endif // _MSC_VER > 1000 n`";ctQT  
#ifndef __AFXWIN_H__ fsa  
#error include 'stdafx.h' before including this file for PCH D8P<mIu}Y  
#endif `_Bvae j?,  
#include "resource.h" // main symbols %lZ++?&^  
class CHookApp : public CWinApp j.MpQ^eJ7  
{ 8%s ^>.rG  
 public: eCB(!Y|  
  CHookApp(); a p-\R  
  // Overrides $"[1yQ<p  
  // ClassWizard generated virtual function overrides P+pL2BA  
  //{{AFX_VIRTUAL(CHookApp) mIVnc`3s  
 public: P<b.;Oz__-  
  virtual BOOL InitInstance(); )'8DK$.  
  virtual int ExitInstance(); ,)mqd2)+"  
  //}}AFX_VIRTUAL 6|U0"C#]  
  //{{AFX_MSG(CHookApp) BCV<( @c  
  // NOTE - the ClassWizard will add and remove member functions here. ,eq[X\B>  
  // DO NOT EDIT what you see in these blocks of generated code ! +5Z0-N@  
  //}}AFX_MSG o)'u%m  
  DECLARE_MESSAGE_MAP() $ wGDk  
}; y'?|#%D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /G$8j$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J<x?bIetj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U,"lOG'  
BOOL InitHotkey(); i:`ur  
BOOL UnInit(); ? lC. Pq  
#endif A#~"Gp  
zmkqqiDp_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. v(^{ P  
#include "stdafx.h" @AUx%:}0Y:  
#include "hook.h" )c=R)=N  
#include <windowsx.h> xZjl_ b J  
#ifdef _DEBUG 7|3Qcn7P)@  
#define new DEBUG_NEW wsp&U .z  
#undef THIS_FILE xN wKTIK$  
static char THIS_FILE[] = __FILE__; R? Y#>K  
#endif YK*2  
#define MAX_KEY 100 &T?>Kx  
#define CTRLBIT 0x04 HM%n`1ZU  
#define ALTBIT 0x02 v0!>":  
#define SHIFTBIT 0x01 >B$ZKE  
#pragma data_seg("shareddata") A+%oE  
HHOOK hHook =NULL; F\ !;}z  
UINT nHookCount =0; =W)Fa6P3j(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey hGi"=Oud2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT MfUG@  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xkR--/f  
static int KeyCount =0; "- xm+7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r{qM!(T  
#pragma data_seg() SeAokz>  
HINSTANCE hins; uEQH6~\{Nl  
void VerifyWindow(); I@P[}XS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $Tu%dE(OF  
//{{AFX_MSG_MAP(CHookApp) \FN"0P(G  
// NOTE - the ClassWizard will add and remove mapping macros here. ,c"_X8Fkx$  
// DO NOT EDIT what you see in these blocks of generated code! k$kq|  
//}}AFX_MSG_MAP {snLiCl  
END_MESSAGE_MAP() N'R^S98x  
?RGL0`Lg  
CHookApp::CHookApp() GutH}Kz"&  
{ yA*~O$~Y  
 // TODO: add construction code here, 2|F.JG^  
 // Place all significant initialization in InitInstance dT8m$}h9  
} M= !Fb  
Mt)~:V+:  
CHookApp theApp; p,}-8#K[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yrO'15TB  
{ x!bFbi#!"  
 BOOL bProcessed=FALSE; +U&aK dQs  
 if(HC_ACTION==nCode) ?H1I,]Di  
 { h!56?4,%Y  
  if((lParam&0xc0000000)==0xc0000000){// Key up Gxv@a   
   switch(wParam) F.c`0u;=  
   { bTZ/$7pp9  
    case VK_MENU: M $#zvcp  
     MaskBits&=~ALTBIT; i+T#z  
     break; G T#hqt'1x  
    case VK_CONTROL: 2D`@$)KL  
     MaskBits&=~CTRLBIT; NylN-X7[#  
     break; P, !si#  
    case VK_SHIFT: I9N?zmH  
     MaskBits&=~SHIFTBIT; =Z_\8qc  
     break; L~A"%T,/h  
    default: //judge the key and send message T[>h6d  
     break; ,GXwi|Y  
   } &H,5f#  
   for(int index=0;index<MAX_KEY;index++){ q a#Fa)g*  
    if(hCallWnd[index]==NULL) 6FG h=~{3,  
     continue; t ),~w,7(J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &W fs6g  
    { <&TAN L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iZ#dS}VlJ  
     bProcessed=TRUE; Zoj.F  
    } {g\Yy(r  
   } w=d#y )1  
  } :k8>)x] )  
  else if((lParam&0xc000ffff)==1){ //Key down `x$d8(1J`#  
   switch(wParam) S%uH*&`  
   { sR,]eo<p&  
    case VK_MENU: *X\i= K!  
     MaskBits|=ALTBIT; 1i#uKKwE  
     break; :s+AIo6  
    case VK_CONTROL: rxCEOG  
     MaskBits|=CTRLBIT; jV8mn{<  
     break; +`9 ]L]J]4  
    case VK_SHIFT: 2<>n8K  
     MaskBits|=SHIFTBIT; X}p#9^%N  
     break; %Fq"4%  
    default: //judge the key and send message -[i9a:eRM  
     break; SSycQ4[{o  
   } } IFZ$Y  
   for(int index=0;index<MAX_KEY;index++) xy46].x-  
   { wx -NUTRim  
    if(hCallWnd[index]==NULL) z %{>d#rw  
     continue; Z"'rc.>a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [VIdw 92  
    { 1qbd6D|t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (7`goi7M  
     bProcessed=TRUE; 'IBs/9=ZC  
    } Dk|S`3  
   } (~xFd^W9o  
  } '?t]iRCeI7  
  if(!bProcessed){ k#R}^Q  
   for(int index=0;index<MAX_KEY;index++){ #9}KC 9f  
    if(hCallWnd[index]==NULL) QD]Vfj4+  
     continue; mu)?SGpyE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4Ub_;EI>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *$/7;CLq  
   } yw"FI!M  
  } >WE3$Q>bi  
 } >Mj :'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); En8-Hc#NC  
} qqT6C%Q`kG  
hD{+V!{  
BOOL InitHotkey() B<DvH"+$  
{ l@Ma{*s6=5  
 if(hHook!=NULL){ &WN4/=QW-J  
  nHookCount++; bB3Mpaw@  
  return TRUE; /@R|*7K;9  
 } 'Kxs>/y3  
 else -en:81a#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); WqqrfzlM  
  if(hHook!=NULL) OJ8W'"`L&  
   nHookCount++; NSHWs%Zc  
  return (hHook!=NULL); NLw#b?%  
} 'P32G?1C&p  
BOOL UnInit() $5r[YdnY<  
{ #tN)OZA  
 if(nHookCount>1){ (S0MqX*  
  nHookCount--; s#;|8_L M  
  return TRUE; 4pV.R5:  
 } ` B) ~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); XD{U5.z>y  
 if(unhooked==TRUE){ 1""9+4  
  nHookCount=0; !tCw)cou  
  hHook=NULL; 6xr$  
 } gC;y>YGP  
 return unhooked; Z}f$ KWj  
} X/lLM`  
i96Pel  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xU@YBzbk  
{ tS#EqMf&o  
 BOOL bAdded=FALSE; LkMhS0?(T  
 for(int index=0;index<MAX_KEY;index++){ gsI"G  
  if(hCallWnd[index]==0){  }XaO~]  
   hCallWnd[index]=hWnd; Nz#T)MGO`  
   HotKey[index]=cKey; cbsy&U  
   HotKeyMask[index]=cMask; zBay 3a  
   bAdded=TRUE; Vi23pDZ5  
   KeyCount++; V;L^q?v !  
   break; x8.7])?w  
  } 15r,_Gp8  
 } hdW",Bf'  
 return bAdded; }+#-\a2  
} qg:R+`z  
*GbC`X)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) # ,u7lAz  
{ ,IA0n79  
 BOOL bRemoved=FALSE; ~;aSX1   
 for(int index=0;index<MAX_KEY;index++){ '{\VO U  
  if(hCallWnd[index]==hWnd){ Hhr/o~?;}#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j;<Yje&Wz  
    hCallWnd[index]=NULL; -2o4v#d  
    HotKey[index]=0; WfBA5  
    HotKeyMask[index]=0; l?NRQTG  
    bRemoved=TRUE; *I`Sc|A  
    KeyCount--; "u Xl  
    break; <(6@l@J|6  
   } 699z@>$}  
  } Z8(1QU,~2  
 } = PcmJG]  
 return bRemoved; 1s-k=3)  
} IQMk:  
A@j;H|  
void VerifyWindow() Ljq/f& c  
{ $@FD01h.t3  
 for(int i=0;i<MAX_KEY;i++){ jRm:9`.Q  
  if(hCallWnd!=NULL){ ]NNLr;p  
   if(!IsWindow(hCallWnd)){ pM@|P,w {  
    hCallWnd=NULL; |]RV[S3v  
    HotKey=0; /gL(40  
    HotKeyMask=0; 49bzHEqZ  
    KeyCount--; !(*mcYA*W  
   } gq*- v:P>  
  } R s_@L}U..  
 } -\6tVF11z  
} %'kaNpBz  
v$K`C;  
BOOL CHookApp::InitInstance() 'v* =}k  
{ }$hxD9z  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^5qX+!3r{  
 hins=AfxGetInstanceHandle(); ; @ h{-@  
 InitHotkey(); -?!|W-}@G=  
 return CWinApp::InitInstance(); "L1cHP~d  
} ]3 YJE P  
;y%lOYm  
int CHookApp::ExitInstance() F_/]9tz?;  
{ _K )B  
 VerifyWindow(); zawU  
 UnInit(); 7fLLV2  
 return CWinApp::ExitInstance(); mk~i (Ee  
} K%Mm'$fTw  
WiH%URFB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m( C7Fa  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S]KcAz(fX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @BbZ(cZ*  
#if _MSC_VER > 1000 i@6MO'y  
#pragma once xQ>c.}J/i  
#endif // _MSC_VER > 1000 ~cz] Rhq  
Dn) =V.  
class CCaptureDlg : public CDialog &9$0v"`H  
{ fa=#S  
 // Construction B~cq T/\?  
 public: p.n]y=o.)  
  BOOL bTray; F:%= u =  
  BOOL bRegistered; /u<lh. hPW  
  BOOL RegisterHotkey(); VQZ3&]o  
  UCHAR cKey; Nv,[E+a2  
  UCHAR cMask; a_^3:}i~D  
  void DeleteIcon(); mn{8"@Z  
  void AddIcon(); f~jx2?W  
  UINT nCount; u6'vzLmM  
  void SaveBmp(); @CP"AYB #  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor jC*(ZF1B  
  // Dialog Data q]0a8[]3  
  //{{AFX_DATA(CCaptureDlg) ';+;  
  enum { IDD = IDD_CAPTURE_DIALOG }; nSz Fs(]f  
  CComboBox m_Key; V5i_\A  
  BOOL m_bControl; D7X-|`kH  
  BOOL m_bAlt; `. /[/ z-g  
  BOOL m_bShift; %/,PY>:|  
  CString m_Path; XLwbA4ORq  
  CString m_Number; `4.Wdi-Si  
  //}}AFX_DATA s24-X1d(9  
  // ClassWizard generated virtual function overrides GI WgfE?  
  //{{AFX_VIRTUAL(CCaptureDlg) W:aAe%S  
 public: lN,b@;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y:^~KS=Uz  
 protected: b\7-u-   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {0lY\#qcE  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :bE ^b  
  //}}AFX_VIRTUAL P|v;'9  
  // Implementation  $hPAp}  
 protected: qDM/ 6xO  
  HICON m_hIcon; Wcz{": [  
  // Generated message map functions Ig'Y]%Z0  
  //{{AFX_MSG(CCaptureDlg) K)]7e?:Wu  
  virtual BOOL OnInitDialog(); A]Zp1XEG  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r[eZV"  
  afx_msg void OnPaint(); k*-_CO-h  
  afx_msg HCURSOR OnQueryDragIcon(); 8d-; ;V  
  virtual void OnCancel(); 25l6@7q.  
  afx_msg void OnAbout(); +>.plvZhu  
  afx_msg void OnBrowse(); fNFdZ[qOd  
  afx_msg void OnChange(); H.7gSB1  
 //}}AFX_MSG ?Gp~i]  
 DECLARE_MESSAGE_MAP() v>c[wg9P  
}; jm =E_86_  
#endif Oe'Nn250  
c#OZ=`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S&6}9r  
#include "stdafx.h" .hg<\-:_  
#include "Capture.h" H #J"'  
#include "CaptureDlg.h" 5w gtc~  
#include <windowsx.h> Q#}} 1}Ja  
#pragma comment(lib,"hook.lib") (i|`PA  
#ifdef _DEBUG -vGyEd7  
#define new DEBUG_NEW e=%7tK*  
#undef THIS_FILE (gNI6;P;}  
static char THIS_FILE[] = __FILE__; Vt5%A}.VQ  
#endif w(J-[t118  
#define IDM_SHELL WM_USER+1 @!Il!+^3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); teUCK(;23  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ar'}#6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BgA\l+  
class CAboutDlg : public CDialog 1HN_  
{ DOkEWqM!  
 public: }1`Rq?@J  
  CAboutDlg(); l'&l!D&   
  // Dialog Data  )"&-vg<  
  //{{AFX_DATA(CAboutDlg) ?p. dc ~tZ  
  enum { IDD = IDD_ABOUTBOX }; .'lc[iI9)d  
  //}}AFX_DATA Bo`fy/x#  
  // ClassWizard generated virtual function overrides go]d+lhFB  
  //{{AFX_VIRTUAL(CAboutDlg) |^S[Gr w  
 protected: G 8uX[-L1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J,;; `sf  
  //}}AFX_VIRTUAL 9*[!uu  
  // Implementation 3HO 4 h\mp  
 protected: S5" xb  
  //{{AFX_MSG(CAboutDlg) K^J;iu4  
  //}}AFX_MSG RT9fp(6*  
  DECLARE_MESSAGE_MAP() 56G5JSB=\  
}; %;yo\  
1|;WaO1Q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jn^i4f>N  
{ Q&MZ/Nnf  
 //{{AFX_DATA_INIT(CAboutDlg) 6aM`qz)  
 //}}AFX_DATA_INIT lDe9EJR  
} 2N5 N^S  
Cs^o- g!L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) HNY{%D  
{ r;y&Wa  
 CDialog::DoDataExchange(pDX); izY,t!  
 //{{AFX_DATA_MAP(CAboutDlg) CLQ\Is^]  
 //}}AFX_DATA_MAP %p/Qz|W  
} nkS6A}i3o  
(^qcX;-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *7ap[YXZ\w  
 //{{AFX_MSG_MAP(CAboutDlg) 8ji!FZf  
 // No message handlers ,G"?fQ7zR  
 //}}AFX_MSG_MAP m]Z+u e  
END_MESSAGE_MAP() >7vSN<w~m  
-3wg9uZ &  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) SQvicZAN)`  
: CDialog(CCaptureDlg::IDD, pParent) y3 LWh}~E  
{ 4J!1$   
 //{{AFX_DATA_INIT(CCaptureDlg) cC"7Vt9b  
  m_bControl = FALSE; 'V4.umj1~  
  m_bAlt = FALSE; VEpIAC4  
  m_bShift = FALSE; &4O"Xs`ka  
  m_Path = _T("c:\\"); CS50wY  
  m_Number = _T("0 picture captured."); S&_ZQLiQ$  
  nCount=0; _]j=[|q 9  
  bRegistered=FALSE; cn<9!2a  
  bTray=FALSE; `WWf?g  
 //}}AFX_DATA_INIT 4yQ4lU,r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 twf;{lZ(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +ywWQ|V  
} m;K Mr6sO  
d^ipf*aLC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) x[WT)  
{ OTN"XKa$  
 CDialog::DoDataExchange(pDX); U=Z@Ipu5T  
 //{{AFX_DATA_MAP(CCaptureDlg) %04>R'mN  
  DDX_Control(pDX, IDC_KEY, m_Key); Y +HVn0~qz  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `"GD'Oa  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (cC5zv*E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); fN0D\Mu!)b  
  DDX_Text(pDX, IDC_PATH, m_Path); aR}NAL_`w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #xYkG5`lm  
 //}}AFX_DATA_MAP BzTm[`(h  
} $T;3*D90  
YyK9UZjI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) aFIet55o  
//{{AFX_MSG_MAP(CCaptureDlg) #g~~zwx/N  
 ON_WM_SYSCOMMAND() @{+*ea7M(`  
 ON_WM_PAINT() u>k;P UH4  
 ON_WM_QUERYDRAGICON() &_q;X;}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) um&N|5lHb  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5mER&SX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Rv.W~FE^  
//}}AFX_MSG_MAP (ter+rTv  
END_MESSAGE_MAP() O- |RPW}  
CdWGb[uI  
BOOL CCaptureDlg::OnInitDialog() qaw5<  
{ G?3S_3J2  
 CDialog::OnInitDialog(); OX8jCW  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q{>9Dg  
 ASSERT(IDM_ABOUTBOX < 0xF000); p&vQ* }  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y,Dfqt  
 if (pSysMenu != NULL) [USXNe/  
 { 7:bqh$3!s  
  CString strAboutMenu; (9Hc`gd)p  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @3VL _g:  
  if (!strAboutMenu.IsEmpty()) =%2 E|/  
  { H{yPi7 P  
   pSysMenu->AppendMenu(MF_SEPARATOR); hzKfYJcQ|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (O?z6g  
  } <6v7_  
 } B-@f.NO/s  
 SetIcon(m_hIcon, TRUE); // Set big icon _NA]= #J  
 SetIcon(m_hIcon, FALSE); // Set small icon Ta9;;B?$  
 m_Key.SetCurSel(0); *D4H;P#  
 RegisterHotkey(); >4h4t/G  
 CMenu* pMenu=GetSystemMenu(FALSE); P-+^YN,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fK4laDB TO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8 eh C^Cg  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Xk7zXah  
 return TRUE; // return TRUE unless you set the focus to a control E62*J$wN@  
} TuaT-Z~U{  
zYls>fbp,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) r9b`3yr=  
{ K''b)v X4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) azE>uEsE  
 { &<tji8Dj  
  CAboutDlg dlgAbout; zQ)[re)  
  dlgAbout.DoModal(); {K[+nX =#  
 } 1$xt=*.u|  
 else *qz]vUb/0  
 { T}u'  
  CDialog::OnSysCommand(nID, lParam); 9F,jvCM63  
 } .3ic%u;|D  
} JmY"Ja,&  
f kP WGd  
void CCaptureDlg::OnPaint() #jDO?Y Sa  
{ 55,vmDd  
 if (IsIconic()) aQRZyE}  
 { rbP.N ?YU%  
  CPaintDC dc(this); // device context for painting vo0[Z,aH5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?d_<S0j-)  
  // Center icon in client rectangle aP"i_!\.aa  
  int cxIcon = GetSystemMetrics(SM_CXICON); q07rWPM "e  
  int cyIcon = GetSystemMetrics(SM_CYICON); L` Qiu@  
  CRect rect; 2<.}]yi  
  GetClientRect(&rect); nG8]c9\Q#  
  int x = (rect.Width() - cxIcon + 1) / 2; Crww\#E;  
  int y = (rect.Height() - cyIcon + 1) / 2; fF *a/\h %  
  // Draw the icon BA-n+WCWJ  
  dc.DrawIcon(x, y, m_hIcon); d]@9kG  
 } 0K#dWc}"a  
 else iqOd]H]v  
 { /iukiWeW  
  CDialog::OnPaint(); F,lQj7  
 } lzw r]J%|?  
} 9ykmz (  
sq<y2j1oF  
HCURSOR CCaptureDlg::OnQueryDragIcon() }* BY!5  
{ ;{Ovqo|  
 return (HCURSOR) m_hIcon; ;dPLi4=o  
} cuSXv)  
A#8/:t1AW  
void CCaptureDlg::OnCancel() 'etCIl3  
{ TcGxm7T  
 if(bTray) Zu+Z7@$}/  
  DeleteIcon(); z6Mf>q  
  CDialog::OnCancel(); $ Q2|{*  
} kM9E)uT>(<  
.WtaU  
void CCaptureDlg::OnAbout() F] ~`57  
{ I[F.M}5:z  
 CAboutDlg dlg; uvm=i .  
 dlg.DoModal(); ]INbRytvc  
} v"bOv"!al  
yWX:`*GV  
void CCaptureDlg::OnBrowse() ^M,Q<HL  
{ g4-HUc zk  
 CString str; 7v=Nh  
 BROWSEINFO bi; /yH:ur  
 char name[MAX_PATH]; 4!E6|N%f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); . e]!i(5I  
 bi.hwndOwner=GetSafeHwnd(); 3S <5s}  
 bi.pszDisplayName=name; `FmI?:Cv  
 bi.lpszTitle="Select folder"; 6BMRl%3>Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T4Zp5m")  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); yfaXScbE  
 if(idl==NULL) UUA7m$F1  
  return; m >'o&Hj  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K_}vmB\2l  
 str.ReleaseBuffer(); IcaF 4#  
 m_Path=str;  ,?`$ ~8  
 if(str.GetAt(str.GetLength()-1)!='\\') .CmwR$u&  
  m_Path+="\\"; JEBx|U$'Y  
 UpdateData(FALSE); VT-&"Jn  
} KDCq::P<  
ybB/sShGM  
void CCaptureDlg::SaveBmp() 8"p>_K=  
{ r$0" Y-a  
 CDC dc; H!vvdp?Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); > Y[{m $-  
 CBitmap bm; 1UmV &  
 int Width=GetSystemMetrics(SM_CXSCREEN); o&X!75^G>  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9i9VDk{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); D^f;dT;-  
 CDC tdc; fxyPh  
 tdc.CreateCompatibleDC(&dc); lN^L#m*@  
 CBitmap*pOld=tdc.SelectObject(&bm); .|_+>){$w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rK"$@ tc  
 tdc.SelectObject(pOld); ]@Zj-n8  
 BITMAP btm; B"8^5#t4s  
 bm.GetBitmap(&btm); %>pglI  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *<BasP  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O </<  
 BITMAPINFOHEADER bih; 7@C :4c@0  
 bih.biBitCount=btm.bmBitsPixel; e;[/ytz"d'  
 bih.biClrImportant=0; 44b'40  
 bih.biClrUsed=0; +[D=2&tmk  
 bih.biCompression=0; Z7Mc.[C  
 bih.biHeight=btm.bmHeight; r@iGM Jx$  
 bih.biPlanes=1; X $cW!a  
 bih.biSize=sizeof(BITMAPINFOHEADER); U3p=H^MB.  
 bih.biSizeImage=size; "iOT14J!7  
 bih.biWidth=btm.bmWidth; x?f3XEA_  
 bih.biXPelsPerMeter=0; R$cg\DD  
 bih.biYPelsPerMeter=0; {n |Ra[9_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^oPf>\),C  
 static int filecount=0; gLu#M:4N  
 CString name; Mi:$<fEX  
 name.Format("pict%04d.bmp",filecount++); [N H[n#  
 name=m_Path+name; ZW*"Kok  
 BITMAPFILEHEADER bfh; W;u~}k<  
 bfh.bfReserved1=bfh.bfReserved2=0; +tlTHK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); m"jqHGFV  
 bfh.bfSize=54+size; J6&;pCAi  
 bfh.bfOffBits=54; `MEH/  
 CFile bf; O cm  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =|am=Q?Q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +D$\^ <#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,mjwQ6:Ny  
  bf.WriteHuge(lpData,size); qhiQ!fMQ  
  bf.Close(); uKhfZSx0 w  
  nCount++; JCS$Tm6y<_  
 } Vb0hlJb  
 GlobalFreePtr(lpData); |W{z,e01x  
 if(nCount==1) $t[`}I }  
  m_Number.Format("%d picture captured.",nCount); \6nWt6M  
 else |A}E/=HPU  
  m_Number.Format("%d pictures captured.",nCount); v#=-  
  UpdateData(FALSE); [4sbOl5yZ  
} R.+Q K6B&  
zFwp$K>{QY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IO|">a6  
{ (hdP(U77  
 if(pMsg -> message == WM_KEYDOWN) /GfC/)1_  
 { K)F;^)KDHf  
  if(pMsg -> wParam == VK_ESCAPE) [;#}BlbN  
   return TRUE; 3'*SSZmnOB  
  if(pMsg -> wParam == VK_RETURN) m9xO& @#vx  
   return TRUE; O`~T:N|D  
 } 36.L1!d)pE  
 return CDialog::PreTranslateMessage(pMsg); =U3 !D;XP  
} k`kmmb>  
%6dFACv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ; l+3l ez  
{ %w_h8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (g4.bbEm  
  SaveBmp(); D.U)R7(  
  return FALSE; B9Y "J  
} 9LzQp`In  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lhJT&  
 CMenu pop; g]z,*d  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); uiM*!ge  
 CMenu*pMenu=pop.GetSubMenu(0); rhwY5FD?  
 pMenu->SetDefaultItem(ID_EXITICON); d%5QEVV  
 CPoint pt; rp.JYz,  
 GetCursorPos(&pt); 4AzS~5S  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SJj0*ry:  
 if(id==ID_EXITICON) IP/ zFbc  
  DeleteIcon(); Rr(,i%fu  
 else if(id==ID_EXIT) ~vBmW_j  
  OnCancel(); 3[aCy4O  
 return FALSE; P+,\x&Vr  
} Z!7#"wO9+V  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8H3|^J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :Uj+iYE8Z8  
 AddIcon(); W UDQb5k  
 return res; cYmMO[4YG'  
} l+y/Mq^QB  
q-X)tH_+w@  
void CCaptureDlg::AddIcon() WF-B=BRZ  
{ r4A%`sk@  
 NOTIFYICONDATA data; O0';j!?X  
 data.cbSize=sizeof(NOTIFYICONDATA); BTgL:  
 CString tip; @T>)fKCg  
 tip.LoadString(IDS_ICONTIP); \oLRNr[F  
 data.hIcon=GetIcon(0); b78'yM&  
 data.hWnd=GetSafeHwnd(); L:%; Fx2  
 strcpy(data.szTip,tip); $kvF]|<bu  
 data.uCallbackMessage=IDM_SHELL; Vb|DNl@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ld$LG6[PA  
 data.uID=98; a~DR$^m  
 Shell_NotifyIcon(NIM_ADD,&data); N-4LdC  
 ShowWindow(SW_HIDE); P ;PS+S9  
 bTray=TRUE; R0, Q`  
} UYD(++  
_(TavL>l =  
void CCaptureDlg::DeleteIcon() 2< w/GX.  
{ Xc"S"a^\%  
 NOTIFYICONDATA data; TY5<hPU=  
 data.cbSize=sizeof(NOTIFYICONDATA); 2?nK71c"  
 data.hWnd=GetSafeHwnd(); U}_l]gNn  
 data.uID=98; +#A >[,U  
 Shell_NotifyIcon(NIM_DELETE,&data); j'#W)dp(  
 ShowWindow(SW_SHOW); 9)3ok#pQ/  
 SetForegroundWindow(); ;WO/xA-#  
 ShowWindow(SW_SHOWNORMAL); Vq -!1.v3  
 bTray=FALSE; rwv_ RN  
} 2.Th29]  
tB8XnO_c  
void CCaptureDlg::OnChange() K q: +{'  
{ H&6lQ30/)  
 RegisterHotkey(); _t 'Kj \  
} #Kn=Q  
`6?r.;wj  
BOOL CCaptureDlg::RegisterHotkey() >-c;  
{ v|<Dc8i+  
 UpdateData(); 71m dU6Kq  
 UCHAR mask=0; blk ~r0.2  
 UCHAR key=0; :L&-  
 if(m_bControl) LoPWho[8  
  mask|=4; 3)Wi? -  
 if(m_bAlt) 7-nwfp&|$  
  mask|=2; ,H'O`oV!1E  
 if(m_bShift) & 2& K9R  
  mask|=1; o{(-jhR  
  key=Key_Table[m_Key.GetCurSel()]; Z; r}G m  
 if(bRegistered){ tE/j3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'd D d9  
  bRegistered=FALSE; ~^UQw? ;  
 } m%X~EwFc.  
 cMask=mask; v1 d]  
 cKey=key; K%Vl:2#F  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I)U|~N  
 return bRegistered; j$4Tot  
} H :}|UW  
&D\~-fOGb  
  四、小结 q UY;CEf  
4xjk^N9  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五