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
  • 6409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: +j_ ;(Gw7  
  96cJ8I8  
  一、实现方法 VZr>U*J[:  
`_I@i]i^  
  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: Qf M zF  
OVzt\V*+%W  
#pragma data_seg("shareddata") e~%  ;K4  
HHOOK hHook =NULL; //钩子句柄 !)"%),>}o  
UINT nHookCount =0; //挂接的程序数目 RcG0 8p.)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~)LH='|h\}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 E907fX[R~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey {R<Ea @LV+  
static int KeyCount =0; >zsid:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /-_=nf}w  
#pragma data_seg() ( 9!k#  
H`bSYjgM!  
  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。 u@'0Vk0zGH  
:NHH Dl  
  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: K5ZC:Ks  
l:0s2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;7]u!Q  
cKey,UCHAR cMask) 5,qj7HZF  
{ /tV/85r  
 BOOL bAdded=FALSE; 'FlJpA}  
 for(int index=0;index<MAX_KEY;index++){ 6=4wp?  
  if(hCallWnd[index]==0){ [yl sz?  
   hCallWnd[index]=hWnd; nkxzk$  
   HotKey[index]=cKey; WG*t ::NN  
   HotKeyMask[index]=cMask; >^q7c8]~g  
   bAdded=TRUE;  B[=(#W  
   KeyCount++; 7Dzuii?1  
   break; !-2R;yo12  
  } 'j^xbikr  
 } ]V %.I_  
 return bAdded; D0k 8^  
} \P} p5k[  
//删除热键 H1<>NWm!v7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3~,d+P  
{ h~&gIub  
 BOOL bRemoved=FALSE; UDhG :  
 for(int index=0;index<MAX_KEY;index++){ =9oP owq  
  if(hCallWnd[index]==hWnd){ I}e 3zf>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p.ANVA@:  
    hCallWnd[index]=NULL; !CX t*/~  
    HotKey[index]=0; ] 2 #  
    HotKeyMask[index]=0; bfB\h*XO  
    bRemoved=TRUE; NaVQ9ku7VW  
    KeyCount--; F(4?tX T  
    break; t*@2OW`!  
   } rg0m a  
  } V/ cP4{L  
 } bCref$|  
 return bRemoved; 3iw{SEY  
} Nx{$}  
>AoK/(yL.  
JdIlWJY  
  DLL中的钩子函数如下: CTWn2tpW  
t+5E#!y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jV.g}F+1m  
{ 4}_O`Uxh  
 BOOL bProcessed=FALSE; Gl1jxxd  
 if(HC_ACTION==nCode) o]nw0q?  
 { `cPywn@uGZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rl9. ]~  
   switch(wParam) g{W;I_P^9  
   {  x~.:64  
    case VK_MENU: R@Gq)P9?  
     MaskBits&=~ALTBIT; &] \X]p  
     break; ~/mw x8~  
    case VK_CONTROL: T+N|R  
     MaskBits&=~CTRLBIT; h;=6VgXZ  
     break; : ^ 8  
    case VK_SHIFT: Gpm{m:$L  
     MaskBits&=~SHIFTBIT; qo<&J f  
     break; *x)Ozfe  
    default: //judge the key and send message 763+uFx^  
     break; &/Ro lIHF  
   } K3\#E/Ox  
   for(int index=0;index<MAX_KEY;index++){ gp$Ucfu'  
    if(hCallWnd[index]==NULL) 8$(Dz]v|[&  
     continue; !61Pl/uQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SIbDj[s  
    { )c l5B{1P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Zy|Mz&  
     bProcessed=TRUE; "NgoaG~!YO  
    } sXd8rj:o  
   } gN)c  
  }  ;raN  
  else if((lParam&0xc000ffff)==1){ //有键按下 e/->_T(I  
   switch(wParam) -P&6L\V  
   { h3T9"w[  
    case VK_MENU: 9f\/\L  
     MaskBits|=ALTBIT; 9-]i.y  
     break; w8g,a]p  
    case VK_CONTROL: ,f1q)Qf  
     MaskBits|=CTRLBIT; >~K qg~  
     break; @ym/27cRE  
    case VK_SHIFT: jy]JiQ B  
     MaskBits|=SHIFTBIT; `DT3x{}_S  
     break; tzy'G"P|  
    default: //judge the key and send message )xb|3&+W  
     break; %,hV[[@.  
   } aR,}W\6M  
   for(int index=0;index<MAX_KEY;index++){ cBo{/Tn:  
    if(hCallWnd[index]==NULL) v)2M1  
     continue; ' B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PMfkA!.Y  
    { W>q HFoKa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lN9=TxH1(;  
     bProcessed=TRUE; c)@>zto#  
    } 1heS*Fwn'  
   } "B_K XL  
  } lV.F,3  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 H3Se={5h\A  
   for(int index=0;index<MAX_KEY;index++){ 5e sQ;  
    if(hCallWnd[index]==NULL) *xp\4;B  
     continue; O5H9Y}i]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q5>v'ZSo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); F@R1:M9*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~tOAT;g}q  
   } Q[+ac*F=Y  
  } >Z1q j>  
 } &qS[%K )  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4mn&4e  
} y>*xVK{D  
S$2b>#@UJ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: I |# 5NE6  
W+*5"h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UX]L;kI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F#|: `$ t  
gIA@l `"  
  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: sBV 4)xM  
1Z{ZV.!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O$IjN x  
{ m^x6>9,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) D~o$GW%  
 { N41R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 /O ]t R  
  SaveBmp(); D5~n/.B"  
  return FALSE; pH`44KAuM  
 } k1VT /u  
 …… //其它处理及默认处理 (|wz7 AY2  
} R0oKbs{  
:{(w3<i  
$<ld3[l i  
  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。 ~^+0  
W d0NT@  
  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。 ]tY ^0a  
Dde]I_f}  
  二、编程步骤 M4xi1M#%  
0-{t FN  
  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"; #M A4  
e L.(p k^<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uIU5.\"s  
ki>~H!zB  
  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; #2iD'>bQ  
wp7!>% s{  
  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; xUfbW;;]UU  
)/t?!T.[  
  5、 添加代码,编译运行程序。 C ;(t/zh  
42L @w  
三、程序代码 eSW{Cb  
$`Ix:gi  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M@W[Bz  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _w*}\~`=^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I5h[%T  
#if _MSC_VER > 1000 [%&ZPJT%i  
#pragma once @]bPVG?d  
#endif // _MSC_VER > 1000 g:0#u;j^7  
#ifndef __AFXWIN_H__ Zf5`XslA.  
#error include 'stdafx.h' before including this file for PCH 2c?qV  
#endif d,$d~alY  
#include "resource.h" // main symbols ,.gQ^^+=  
class CHookApp : public CWinApp 'EFyIVezg9  
{ z4E|Ai  
 public: id?h>g  
  CHookApp(); xooY' El*#  
  // Overrides yUPIY:0  
  // ClassWizard generated virtual function overrides jjM{]  
  //{{AFX_VIRTUAL(CHookApp) pKS {6P  
 public: {-BRt)L[  
  virtual BOOL InitInstance(); f3|@|' ;  
  virtual int ExitInstance(); fqu}Le  
  //}}AFX_VIRTUAL \n9zw'  
  //{{AFX_MSG(CHookApp) rxme(9M  
  // NOTE - the ClassWizard will add and remove member functions here. MQ)L:R` L  
  // DO NOT EDIT what you see in these blocks of generated code ! sdCvG R e  
  //}}AFX_MSG P=1I<Pew  
  DECLARE_MESSAGE_MAP() J9T3nTfL  
}; .vG,fuf8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7Ol}EPf#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H:H6b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OCy0#aPRS  
BOOL InitHotkey(); BnRN;bu  
BOOL UnInit(); E\m5%bK\B  
#endif M,}|tsL  
.@Ut?G  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pWu LfX  
#include "stdafx.h" lO:. OZu  
#include "hook.h" jp' K%P  
#include <windowsx.h>  lWm'  
#ifdef _DEBUG Nm):9YQ/  
#define new DEBUG_NEW 1N2,mo?2  
#undef THIS_FILE fSDi- I  
static char THIS_FILE[] = __FILE__; ~:km]?lz0  
#endif SE7WF18A  
#define MAX_KEY 100 ASPy  
#define CTRLBIT 0x04 h d~$WV0#  
#define ALTBIT 0x02 U:F/ iXz  
#define SHIFTBIT 0x01 4.RG4Jq  
#pragma data_seg("shareddata") ~XeFOM q  
HHOOK hHook =NULL; *Ei|fe$sa  
UINT nHookCount =0; PA w-6;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _7DkS}NJs  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT CQ;]J=|<_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A8A ~!2V  
static int KeyCount =0; oUQ07z\C  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @Mvd'.r<;  
#pragma data_seg() a^5^gId5l!  
HINSTANCE hins; A[WV'!A,  
void VerifyWindow(); |#l=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z>)][pL  
//{{AFX_MSG_MAP(CHookApp) G;3~2^lB\  
// NOTE - the ClassWizard will add and remove mapping macros here. #y|V|nd  
// DO NOT EDIT what you see in these blocks of generated code! ?[x49Ux,P  
//}}AFX_MSG_MAP {K#NB_*To  
END_MESSAGE_MAP() ~el3I=KC}  
P'MY[&|mM'  
CHookApp::CHookApp() Jw~( G9G  
{ ``ekR6[8c  
 // TODO: add construction code here, *Ywpz^2?:  
 // Place all significant initialization in InitInstance T!W~n ZC  
} ^w~23g.  
.yENM[-bQ  
CHookApp theApp; G#Ou[*O'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #GaxZ  
{ |lH;Fq{\  
 BOOL bProcessed=FALSE; j'i0*"x  
 if(HC_ACTION==nCode) ZtVAEIZ)  
 { y$hp@m'@C  
  if((lParam&0xc0000000)==0xc0000000){// Key up :ug4g6;#H0  
   switch(wParam) fx8EB8A7K7  
   { QCPID:  
    case VK_MENU: >s3gqSDR  
     MaskBits&=~ALTBIT; ENh!N4vbO  
     break; @xsCXCRWVV  
    case VK_CONTROL: Z['\61  
     MaskBits&=~CTRLBIT; M\b")Tu{0  
     break; PN+G:Qv  
    case VK_SHIFT: z=&z_}M8  
     MaskBits&=~SHIFTBIT; \RQ='/H*  
     break; }Vu\(~  
    default: //judge the key and send message 6I_Hd>4  
     break; N?dvuB  
   } {5*|C-WWtG  
   for(int index=0;index<MAX_KEY;index++){ XS~- vF  
    if(hCallWnd[index]==NULL) 0^'B3$>  
     continue; 0i[zup  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \bCX=E-  
    { 8 6QE /M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Kt>X3m,  
     bProcessed=TRUE; @&1Wy p  
    } 9@ $,oM=  
   } N^VD=<#T  
  } /RLq>#:h**  
  else if((lParam&0xc000ffff)==1){ //Key down `nR%Cav,U  
   switch(wParam) CBf7]n0H  
   { CLKov\U\  
    case VK_MENU: CGw--`#\  
     MaskBits|=ALTBIT; pO<-.,  
     break; 6)\dBOz  
    case VK_CONTROL: m xw dugr`  
     MaskBits|=CTRLBIT; "HM{b?N  
     break; u!N{y,7W)  
    case VK_SHIFT: h06ku2Q  
     MaskBits|=SHIFTBIT; =R*Gk4<Y  
     break; v;y0jD#b  
    default: //judge the key and send message xa( m5P  
     break; 2}}?'PwwT  
   } Ja]o GT=e  
   for(int index=0;index<MAX_KEY;index++) &Y@#g9G  
   { 3HyhEVR-#~  
    if(hCallWnd[index]==NULL) O\;=V`z-  
     continue; YC_3n5F%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #iSFf  
    { u%O-;>J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]Pn !nSg  
     bProcessed=TRUE; f7}"lG]q  
    } z/&;{J  
   } ,gnQa  
  } LE?u`i,e=+  
  if(!bProcessed){ !a1i Un9  
   for(int index=0;index<MAX_KEY;index++){ VS?@y/\In  
    if(hCallWnd[index]==NULL) ]6tkEyuq  
     continue; t qOi x/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ccfwax+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~!%0Z9>ap  
   } iZ[tHw||  
  } Q"a2.9Eo  
 } Z#`0txCF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); SP 2 8  
} -7'#2P<)  
9CUimZ  
BOOL InitHotkey() #:3r4J%+~  
{ 4lc)&  
 if(hHook!=NULL){ KGZ?b2N?Va  
  nHookCount++; _J?SIm  
  return TRUE; zW{ 6Eg  
 } ;'RFo?u K  
 else yt.c5> B^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); VmQh$&h  
  if(hHook!=NULL) @kngI7=E  
   nHookCount++; 1TqF6`;+  
  return (hHook!=NULL); P`s(kIe  
} !>;w!^U  
BOOL UnInit() %|3e.1oX  
{ }IUP5O6  
 if(nHookCount>1){ <z#BsnjW{  
  nHookCount--; j.-VJo)   
  return TRUE; Rag iV6c  
 } 2?i\@r@E|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ZcPUtun  
 if(unhooked==TRUE){ g"t^r3  
  nHookCount=0; V*B0lI7`B  
  hHook=NULL; 4".J/I5u  
 } %u]6KrG18b  
 return unhooked; #t71U a  
} RJ J1  
sV0Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l%"`{   
{ <4F7@q, V  
 BOOL bAdded=FALSE; ;:#U 6?=t  
 for(int index=0;index<MAX_KEY;index++){ c]Unbm^w  
  if(hCallWnd[index]==0){ O OlTrLL  
   hCallWnd[index]=hWnd; +!&$SNLh(  
   HotKey[index]=cKey; :B#EqeI  
   HotKeyMask[index]=cMask; y~#\#w {  
   bAdded=TRUE; ZW ye> ]  
   KeyCount++; 2o{@nN8%  
   break; %= u/3b:o  
  } $>vy(Y  
 } m^$5K's&  
 return bAdded; qMgfMhQ7DU  
} hN4VlNKu  
&zN@5m$k;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `!c,y~r[  
{ .K9l*-e[=  
 BOOL bRemoved=FALSE; cqQRU  
 for(int index=0;index<MAX_KEY;index++){ GfsBQY/  
  if(hCallWnd[index]==hWnd){ *m_93J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Fn,k!q  
    hCallWnd[index]=NULL; vnsSy33K  
    HotKey[index]=0; (DJvi6\H  
    HotKeyMask[index]=0; cb+y9wA  
    bRemoved=TRUE; QaMDGD  
    KeyCount--; z}5<$K_U  
    break; )bW5yG!  
   } fcAIg(vW  
  } ]t/f<jKN^  
 } *caLN,G  
 return bRemoved; M'u=H  
} ,RK3eQ  
?vu|o'$T,  
void VerifyWindow() ZO7bSxAN-  
{ Ex,JB +  
 for(int i=0;i<MAX_KEY;i++){ O_CT+Ou  
  if(hCallWnd!=NULL){ x}"Q8kD  
   if(!IsWindow(hCallWnd)){ >~&(P_<b  
    hCallWnd=NULL; xYT}>#[  
    HotKey=0; 3_J>y  
    HotKeyMask=0; +Jw{qQR/*  
    KeyCount--; i| xt f  
   } P0#`anUr1  
  } ;QidDi_s>  
 } IxP^i{/1?  
} v' 0!=r  
:VFTVmr  
BOOL CHookApp::InitInstance() b?k4InXh  
{ a%n'%*0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); PPgW ^gj  
 hins=AfxGetInstanceHandle(); px [~=$F  
 InitHotkey(); )VY10 R)$  
 return CWinApp::InitInstance(); 5+y`P$K@  
} "A7<XN<  
jM\ %$_/  
int CHookApp::ExitInstance() DyX0 xx^  
{ @ KJV1t`  
 VerifyWindow(); ?>)yKa#U  
 UnInit(); /| f[us-w  
 return CWinApp::ExitInstance(); uo 4xnzc  
} "UpOY  
,eK2I Ao  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b]K>vhQV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) WY.5K =}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U3VT*nj'  
#if _MSC_VER > 1000 S>EDL  
#pragma once E!dp~RwZu  
#endif // _MSC_VER > 1000 /hfUPO5  
wi BuEaUkW  
class CCaptureDlg : public CDialog fM9xy \.  
{ /#IH -2N  
 // Construction r]-+bR  
 public: {r{>?)O  
  BOOL bTray; hg#c[sZL  
  BOOL bRegistered; 0x4l5x$8  
  BOOL RegisterHotkey(); ~ a >S#S  
  UCHAR cKey; dgY5ccP  
  UCHAR cMask; ecT]p  
  void DeleteIcon(); s[Gswd  
  void AddIcon(); <)J55++  
  UINT nCount; Re\o v x9  
  void SaveBmp(); }6@%((9E 2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]gHLcr3  
  // Dialog Data w< mqe0  
  //{{AFX_DATA(CCaptureDlg) %Y 2G  
  enum { IDD = IDD_CAPTURE_DIALOG }; K /ZHJkJ7  
  CComboBox m_Key; } Ab _o#Zy  
  BOOL m_bControl; 6>lW5U^yA\  
  BOOL m_bAlt; 'F<Sf:?.p  
  BOOL m_bShift; 5E.vje{U;  
  CString m_Path; &&*wmnWCS{  
  CString m_Number; [[$Mh_MD  
  //}}AFX_DATA dL(4mR8  
  // ClassWizard generated virtual function overrides D0KELA cY  
  //{{AFX_VIRTUAL(CCaptureDlg) ]eD[4Y\#t  
 public: }M="oN~w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); YZ{;%&rB  
 protected: d>~`j8,B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e~*S4dKR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ss+F9J  
  //}}AFX_VIRTUAL LiF.w:}  
  // Implementation ^Wk0*.wg  
 protected: R1~7F{FW  
  HICON m_hIcon; BMF3XcH~G  
  // Generated message map functions  X)y*#U  
  //{{AFX_MSG(CCaptureDlg) MKe *f%  
  virtual BOOL OnInitDialog(); I'P.K| "R  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P1e5uJkd  
  afx_msg void OnPaint(); ~"\P~cg0J  
  afx_msg HCURSOR OnQueryDragIcon(); .;j"+Ef   
  virtual void OnCancel(); y "<JE<X  
  afx_msg void OnAbout(); . *Z#cq0  
  afx_msg void OnBrowse(); F-i&M1 \_  
  afx_msg void OnChange(); 78gob&p?  
 //}}AFX_MSG eNivlJ,K|@  
 DECLARE_MESSAGE_MAP() <%(f9j  
}; 7%X+O8  
#endif fA;x{0CAMX  
m9uUDq#GJ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file tPA"lBS !  
#include "stdafx.h" HN^w'I'bp  
#include "Capture.h" $*wu~  
#include "CaptureDlg.h" Km%8Yw0+  
#include <windowsx.h> sAf9rZt*'  
#pragma comment(lib,"hook.lib") ]KzJ u`O%G  
#ifdef _DEBUG Mru~<:9  
#define new DEBUG_NEW EyzY2>"^  
#undef THIS_FILE }&=uZ:  
static char THIS_FILE[] = __FILE__; 2Sv>C `FMU  
#endif miWw6!()  
#define IDM_SHELL WM_USER+1 +I?Qg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E:%>0FE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t<8z08  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *pY/5? g  
class CAboutDlg : public CDialog La@\q[U{@  
{ eO~eu]r  
 public: z)r8?9u  
  CAboutDlg(); \gjl^# ;  
  // Dialog Data Y{`3`Pg&N  
  //{{AFX_DATA(CAboutDlg) qNhH%tYQ  
  enum { IDD = IDD_ABOUTBOX }; P: jDB{  
  //}}AFX_DATA 7Z9.z 4\  
  // ClassWizard generated virtual function overrides "hJ7 Vv_  
  //{{AFX_VIRTUAL(CAboutDlg) {P,>Q4N  
 protected: aS2a_!f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V#+126  
  //}}AFX_VIRTUAL _3*: y/M_  
  // Implementation e_tZja2s  
 protected: iz,]%<_PE  
  //{{AFX_MSG(CAboutDlg) 8a_ UxB  
  //}}AFX_MSG c,+iU R<  
  DECLARE_MESSAGE_MAP() x4/T?4k  
}; USH@:c#t  
/YS@[\j4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jx)~kK  
{ $gXkx D  
 //{{AFX_DATA_INIT(CAboutDlg) ?=TL2"L  
 //}}AFX_DATA_INIT +!D=SnBGs  
} tuX =o  
@#'yPV1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z&\Il#'\m+  
{ uv?8V@x2  
 CDialog::DoDataExchange(pDX); YWybPD4\(  
 //{{AFX_DATA_MAP(CAboutDlg)  >cC Gx  
 //}}AFX_DATA_MAP 721{Ga4~S  
} v/QEu^C  
i/l!Cr2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Pm;x]Aj  
 //{{AFX_MSG_MAP(CAboutDlg) -9hp+0 <  
 // No message handlers Zb 12:?  
 //}}AFX_MSG_MAP Cmp{FN"o  
END_MESSAGE_MAP() R?1idl)  
oFX"F0rx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m 4wPuW  
: CDialog(CCaptureDlg::IDD, pParent) .~FKyP>[$  
{ #JHy[!4  
 //{{AFX_DATA_INIT(CCaptureDlg) cg>!<T*  
  m_bControl = FALSE; k8!hvJ)?  
  m_bAlt = FALSE; UUt~W  
  m_bShift = FALSE; ay!6 T`U`  
  m_Path = _T("c:\\"); <L[T'ZE+  
  m_Number = _T("0 picture captured."); yBU ZVqqDa  
  nCount=0; r@N39O*Wq  
  bRegistered=FALSE; Q"x`+?!  
  bTray=FALSE; L{+&z7M  
 //}}AFX_DATA_INIT &ryl$!!3H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oAIY=z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *93l${'  
} Tw`F?i~  
IBn'iE[>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TyxU6<>4J4  
{ 9;;]q?*  
 CDialog::DoDataExchange(pDX); &;SwLDF"1  
 //{{AFX_DATA_MAP(CCaptureDlg) ]<&B BQ  
  DDX_Control(pDX, IDC_KEY, m_Key); @]?? +f}#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :mCw.Jz<h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K|P9uHD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uK+9gTv  
  DDX_Text(pDX, IDC_PATH, m_Path); iX0]g45o  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }z9I`6[  
 //}}AFX_DATA_MAP 7UeE(=Hr5  
} ,n /SDEL  
)&b}^1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LS R_x$G+t  
//{{AFX_MSG_MAP(CCaptureDlg) ej)BR'*  
 ON_WM_SYSCOMMAND() ~Hp#6+  
 ON_WM_PAINT() A)O_es 2  
 ON_WM_QUERYDRAGICON() M6o xtt4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4eDmLC"Y *  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) C}M0XW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) hlSB7D"d  
//}}AFX_MSG_MAP (r#5O9|S  
END_MESSAGE_MAP() llTQ\7zP  
r_!{!i3B  
BOOL CCaptureDlg::OnInitDialog() LLXg  
{ Zpn*XG  
 CDialog::OnInitDialog(); tkm~KLWV&7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |IyM"UH  
 ASSERT(IDM_ABOUTBOX < 0xF000); rw40<SS"Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); vu !j{%GO  
 if (pSysMenu != NULL) 9XJ9~I?  
 { .P |+oYT&g  
  CString strAboutMenu; 7$Z)fkx.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T2/v}  
  if (!strAboutMenu.IsEmpty()) t wa(M?  
  { XC+F! R  
   pSysMenu->AppendMenu(MF_SEPARATOR); {y+v-v/#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #'G7mAoA  
  } 2yi*eR  
 } B J:E,P`_  
 SetIcon(m_hIcon, TRUE); // Set big icon 2ZTyo7P  
 SetIcon(m_hIcon, FALSE); // Set small icon #Of<1  
 m_Key.SetCurSel(0); #2ZrdD"5kQ  
 RegisterHotkey(); ;:8jxkx6%  
 CMenu* pMenu=GetSystemMenu(FALSE); e$p1Th*|]4  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  Xv? S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $w";*">:0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1%]{0P0?[  
 return TRUE; // return TRUE unless you set the focus to a control kp#c:ym  
} )Bm^aMVl3  
f//j{P[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) oJ4mxi@|#  
{ n{qa]3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "R\\\I7u  
 { ^Yf)lV&[  
  CAboutDlg dlgAbout; ino7!T`  
  dlgAbout.DoModal(); ^Xt]wl*]+  
 } H;b'"./  
 else P}.yEta  
 { ]/<Qn-BbU  
  CDialog::OnSysCommand(nID, lParam); y$r?t0  
 } ^)%wq@Hi  
} a-UD_|!  
(Ay4B*|!  
void CCaptureDlg::OnPaint() g O\f:Pg  
{ qI4R`P"  
 if (IsIconic()) }{w_>!ee  
 { +i q+  
  CPaintDC dc(this); // device context for painting JJbM)B@-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q%AS ;(d  
  // Center icon in client rectangle 2jrX  
  int cxIcon = GetSystemMetrics(SM_CXICON); am$-sh72  
  int cyIcon = GetSystemMetrics(SM_CYICON); =`7)X\i@z  
  CRect rect; T^=Ee?e  
  GetClientRect(&rect); UmP?}Xw6  
  int x = (rect.Width() - cxIcon + 1) / 2; _6QLnr&@j  
  int y = (rect.Height() - cyIcon + 1) / 2; J4K|KS7   
  // Draw the icon Is*0?9qU  
  dc.DrawIcon(x, y, m_hIcon); j .yr 5%  
 } A]~iuUHm  
 else 8en#PH }  
 { no\}aTx  
  CDialog::OnPaint(); ;>QK}#'  
 } WkU) I2oH  
} Tr}$Pb1  
 S9ak '  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9{]r+z:  
{ ay7+H7^|hZ  
 return (HCURSOR) m_hIcon; *{D:1S  
} W0uM?J\O  
f'zFg["aZS  
void CCaptureDlg::OnCancel() \PtC  
{ XR=c 8f  
 if(bTray) U%B]N@  
  DeleteIcon(); C}DG'z9  
  CDialog::OnCancel(); v,x%^gv0  
} e&a[k  
>aanLLO  
void CCaptureDlg::OnAbout() Spr:K,  
{ exrt|A] _[  
 CAboutDlg dlg; iw]B QjK  
 dlg.DoModal(); l.NkS   
} o._#=7|(  
qeO6}A"^|  
void CCaptureDlg::OnBrowse() %Cbc@=k  
{ 7yCx !P;  
 CString str; 9|kEq>d  
 BROWSEINFO bi; p6eDd"Y  
 char name[MAX_PATH]; c402pj  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); oe_[h]Hgl  
 bi.hwndOwner=GetSafeHwnd(); 5KPPZmO  
 bi.pszDisplayName=name; 0.+Z;j  
 bi.lpszTitle="Select folder"; g9r5t';  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; W0?Y%Da(4m  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 51(`wo>LS  
 if(idl==NULL) d=5}^v#4  
  return; WUOPYYW<o  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $P}]|/Yb  
 str.ReleaseBuffer(); F*jj cUk  
 m_Path=str; '>WuukC  
 if(str.GetAt(str.GetLength()-1)!='\\') /Geks/  
  m_Path+="\\"; Qmc;s{-r;  
 UpdateData(FALSE); .Mft+,"  
} `\u),$  
m=y,_Pz>U  
void CCaptureDlg::SaveBmp() z1KC$~{O  
{ u{lDof>  
 CDC dc; /*p?UW<*4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6Bq2?;5  
 CBitmap bm; Kd[`mkmS  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,DUQto  
 int Height=GetSystemMetrics(SM_CYSCREEN); A = Az[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @.]K6qC  
 CDC tdc; Px?At5  
 tdc.CreateCompatibleDC(&dc); MKh L^c-  
 CBitmap*pOld=tdc.SelectObject(&bm); 0-MasI&b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +mQC:B7>  
 tdc.SelectObject(pOld); g}og@UY7#  
 BITMAP btm;  IOES3  
 bm.GetBitmap(&btm); g #<?OFl  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; = ]HJa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &T/9y W[L  
 BITMAPINFOHEADER bih; -0J<R;cVs  
 bih.biBitCount=btm.bmBitsPixel; j]F3[gpc  
 bih.biClrImportant=0; E?5B>Jer#  
 bih.biClrUsed=0; Q_|S^hx Q  
 bih.biCompression=0; uM!r|X)8  
 bih.biHeight=btm.bmHeight; f!kdcr=/"  
 bih.biPlanes=1; iqKfMoy5  
 bih.biSize=sizeof(BITMAPINFOHEADER); Wes "t}[25  
 bih.biSizeImage=size; }PD(kk6fX  
 bih.biWidth=btm.bmWidth; J<:D~@qq  
 bih.biXPelsPerMeter=0; :bF2b..XOu  
 bih.biYPelsPerMeter=0; ,xM*hN3A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3'@jRK  
 static int filecount=0; >U Ich  
 CString name; g:6}zHK  
 name.Format("pict%04d.bmp",filecount++); )^2jsy -/  
 name=m_Path+name; g<0%-p  
 BITMAPFILEHEADER bfh; LFM5W&?  
 bfh.bfReserved1=bfh.bfReserved2=0; (IQ L`3f%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cw-JGqLx  
 bfh.bfSize=54+size; `0vy+T5  
 bfh.bfOffBits=54; K dQ|$t  
 CFile bf; ;%.k}R%O@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6!PX! UkF  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bIl0rx[`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]]QCJf@p  
  bf.WriteHuge(lpData,size); {_N(S]Z  
  bf.Close(); {.8)gVBmA  
  nCount++; -OGy-"  
 } #UnO~IE.m$  
 GlobalFreePtr(lpData); GM56xZ!2T  
 if(nCount==1) ~=gH7V  
  m_Number.Format("%d picture captured.",nCount); szs3x-g  
 else #Lt+6sa]2@  
  m_Number.Format("%d pictures captured.",nCount); -hV KPIb  
  UpdateData(FALSE); Q2WrB+/  
} FrM~6A_  
cx%9UK*c  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -r0\  
{ iYs?B0*JWK  
 if(pMsg -> message == WM_KEYDOWN) :hdh$}y  
 { %lW:8 ckL  
  if(pMsg -> wParam == VK_ESCAPE) l{x#*~g a  
   return TRUE; BQmafpp`  
  if(pMsg -> wParam == VK_RETURN) pY5HW2TsY|  
   return TRUE; @uD{`@[  
 } $>37PVVW  
 return CDialog::PreTranslateMessage(pMsg); !/9Sb1_~  
} EF{'J8AQ  
<g1hdF0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yFtf~8s3  
{ T:5%sN;#O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ siZ_JJW  
  SaveBmp(); B{7/A[$%C  
  return FALSE; 5Jd {Ev  
} hf5SpwxLiH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /3%xQK>%  
 CMenu pop; ~4gKA D  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zC;lfy{f=  
 CMenu*pMenu=pop.GetSubMenu(0); e[o ;l  
 pMenu->SetDefaultItem(ID_EXITICON); &8L\FAY0%9  
 CPoint pt; TTak[e&j3  
 GetCursorPos(&pt); 3Ya6yz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'U Cx^-  
 if(id==ID_EXITICON) Gf.o{  
  DeleteIcon(); JU+'UK630  
 else if(id==ID_EXIT) KftM4SFbK  
  OnCancel(); Pu*UZcXY  
 return FALSE; |W];v@b\y  
} X,CF Y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LMj'?SuH  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nECf2>Yp v  
 AddIcon(); N2Hb19/k  
 return res; \`# 0,pLr  
} o fv 1G=P  
%+J*oFwQu  
void CCaptureDlg::AddIcon() S*@0%|Q4r  
{ U MIZ:*j  
 NOTIFYICONDATA data; =xP{f<`   
 data.cbSize=sizeof(NOTIFYICONDATA); .Q@'Ob`  
 CString tip; V2skr_1  
 tip.LoadString(IDS_ICONTIP); [)c|oh%  
 data.hIcon=GetIcon(0); 84cH|j`w  
 data.hWnd=GetSafeHwnd(); =i %w_ e  
 strcpy(data.szTip,tip); RL8 wSK  
 data.uCallbackMessage=IDM_SHELL; ?saVk7Z[|5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ka2tr]+s  
 data.uID=98; <cjTn:w  
 Shell_NotifyIcon(NIM_ADD,&data); aBLb i  
 ShowWindow(SW_HIDE); L#b Q`t  
 bTray=TRUE; ay[*b_f  
} GQWTQIl]  
d'D\#+%> =  
void CCaptureDlg::DeleteIcon() ?"u-@E[m  
{ A2S9h,t  
 NOTIFYICONDATA data; S*:w\nXP~  
 data.cbSize=sizeof(NOTIFYICONDATA); >ON.ftZ i  
 data.hWnd=GetSafeHwnd(); &$im^0`r_  
 data.uID=98; Rj= Om  
 Shell_NotifyIcon(NIM_DELETE,&data); DlO;EH  
 ShowWindow(SW_SHOW); (LPD  
 SetForegroundWindow(); S`.-D+.68  
 ShowWindow(SW_SHOWNORMAL); F\72^,0  
 bTray=FALSE; IQv>{h}  
} F'*4:WD7  
- mXr6R?  
void CCaptureDlg::OnChange() =1Jo-!{{  
{ VHNiTp  
 RegisterHotkey(); }Cf[nGh|B  
} C>ZeG Vq  
!-~(*tn  
BOOL CCaptureDlg::RegisterHotkey() pdqh'+5  
{ mr.DP~O:9p  
 UpdateData(); _"`h~jB  
 UCHAR mask=0; f d5~'2  
 UCHAR key=0; 6>J #M  
 if(m_bControl) _gh7_P^H=d  
  mask|=4; 3/05ee;|  
 if(m_bAlt) Bk <P~-I  
  mask|=2; *h9vMks o  
 if(m_bShift) P^-9?u Bno  
  mask|=1; #IDCCD^1=  
  key=Key_Table[m_Key.GetCurSel()]; ^123.Ru|t  
 if(bRegistered){ w7u >|x!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^Yz05\  
  bRegistered=FALSE; Z Z7U^#RT  
 } d5hE!=  
 cMask=mask; s ~G{-)*  
 cKey=key; OK(d&   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4y.[tk5  
 return bRegistered; _Oq\YQb v  
} miqCUbcU  
xM\ApN~W  
  四、小结 K(S/D(\ FL  
n Lb 9$&  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五