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
  • 5322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: iKJqMES  
  "j,vlG  
  一、实现方法 g}D)MlXRq  
@GQfBV|3  
  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: `HXv_9  
'!7>*<  
#pragma data_seg("shareddata") D~ Y6%9  
HHOOK hHook =NULL; //钩子句柄  c2M  
UINT nHookCount =0; //挂接的程序数目 BL16?&RK  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^py=]7[I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ya8p 4N{_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9Sxr9FLW~  
static int KeyCount =0; 6Qt(Yu*s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [_(J8~ va  
#pragma data_seg() 06f%{mAZS  
aX;>XL4  
  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。 M x#L|w`r  
]wU/yc)e  
  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: 6Lq`zU^  
nZ(]WPIN"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR CE`]X;#y  
cKey,UCHAR cMask) .s*N1 U?h  
{ F8?2+w@P  
 BOOL bAdded=FALSE; x'x5tg  
 for(int index=0;index<MAX_KEY;index++){ xj>P5\mW#  
  if(hCallWnd[index]==0){ bt)C+|i  
   hCallWnd[index]=hWnd; U+x^!{[/  
   HotKey[index]=cKey; %%s)D4sW  
   HotKeyMask[index]=cMask; 9efey? z  
   bAdded=TRUE; <.n,:ir  
   KeyCount++; D:U6r^c  
   break; EyA ny\"  
  } <}{<FXk[  
 } )-)rL@s.  
 return bAdded; 2lpPN[~d  
} ))|d~m  
//删除热键 /GO-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F%|P#CaB  
{ |gO7`F2  
 BOOL bRemoved=FALSE; >S7t  
 for(int index=0;index<MAX_KEY;index++){  k;+TN9  
  if(hCallWnd[index]==hWnd){ h8`On/Ur_8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l&+O*=#Hh  
    hCallWnd[index]=NULL; BJux5Nh  
    HotKey[index]=0; r{R<J?Y  
    HotKeyMask[index]=0; );d07\V  
    bRemoved=TRUE; .t1:;H b  
    KeyCount--; w{*kbGB8s7  
    break; >fXtu:C-!J  
   } qKfUm:7Q_  
  } +Pl)E5W!=`  
 } :6nD"5(  
 return bRemoved; &Uam4'B6-  
} bQautRW  
U3a2wK  
UXBWCo;-  
  DLL中的钩子函数如下: 1,+<|c)T?  
#MA6eE'R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sWr;%<K  
{ B<SE|~\2  
 BOOL bProcessed=FALSE; Ux=~-}<-w  
 if(HC_ACTION==nCode) o(SPT?ao~  
 { ih0a#PB8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 tVAo o-%  
   switch(wParam) &<e18L 7a  
   {  (uvQ/!  
    case VK_MENU: MT~^wI0a  
     MaskBits&=~ALTBIT; ]!{S2x&"  
     break; ]M*`Y[5"  
    case VK_CONTROL: D5c 8sB  
     MaskBits&=~CTRLBIT; u @Ze@N%  
     break; =l43RawAmu  
    case VK_SHIFT: W9%v#;2  
     MaskBits&=~SHIFTBIT; -13}]Gls7Q  
     break; 9-T<gYl  
    default: //judge the key and send message >XgJo7u  
     break; Pb'(Y  
   } x;7l>uR  
   for(int index=0;index<MAX_KEY;index++){ Qf( A  
    if(hCallWnd[index]==NULL) uM`i!7}  
     continue; jlj ge=#c2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )ovAGO  
    { .b]s Q'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "KP]3EyPc  
     bProcessed=TRUE; [y9a.*]u/@  
    } .gg0rTf=-  
   } (BLxK)0<"  
  } vd lss|  
  else if((lParam&0xc000ffff)==1){ //有键按下 EU[eG^/0@  
   switch(wParam) dB_0B .  
   { y{@\8B]  
    case VK_MENU: oM!&S'M/  
     MaskBits|=ALTBIT; k 3m_L-  
     break; [=(8yUV'G  
    case VK_CONTROL: (Y)2[j  
     MaskBits|=CTRLBIT; OWewV@VXR  
     break; `CVkjLiy  
    case VK_SHIFT: &'>m;W  
     MaskBits|=SHIFTBIT; hEB5=~A_  
     break; z='%NZY  
    default: //judge the key and send message 0beP7}$  
     break; /X_L>or  
   } #Q!Xz2z2  
   for(int index=0;index<MAX_KEY;index++){ j2Dw7"f3  
    if(hCallWnd[index]==NULL) z+yq%O  
     continue; kZG.Id  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d MR?pbD  
    { 33DP?nI}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5=C?,1F$A  
     bProcessed=TRUE; kC.!cPd  
    } FB?~:7+'  
   } u$R5Q{H_  
  } 5c]:/9&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 I/njyV)H  
   for(int index=0;index<MAX_KEY;index++){ u"qVT9C$=  
    if(hCallWnd[index]==NULL) ]Kq<U%x$  
     continue; cRf F!EV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X~jdOaq{F:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  c`xNTr01  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,)[9RgsE  
   } b$DiDm  
  } U&#` <R_0  
 } VP A+/5TW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d2UidDU5qa  
} F NPu  
!*:g??[T  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: c7r( &h  
06]3+s{{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E'a OHSAg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hP+4{F*}-  
|s! _;6  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: jM$bWtq2  
qt@/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +4%~.,<_to  
{ ] x)>q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) lV^#[%  
 { R/v|ZvI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u&I c  
  SaveBmp(); D@La-K*5  
  return FALSE; veq3t$sj  
 } A8&@Vxdz  
 …… //其它处理及默认处理 ! :]_-DX  
} #$BFTlm|  
Cw(e7K7&  
Acw`ytV  
  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。 u9@B&  
,ho",y  
  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。 g,\kLTg  
qIuo8o}  
  二、编程步骤 3`reXms*{  
u9f^wn  
  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"; v<v;ZR)  
yb',nGl~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; h7+"*fN  
h&j2mv(  
  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; .rk5u4yK  
c]E pg)E  
  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; VkJ">0k  
4nm.ea|  
  5、 添加代码,编译运行程序。 ^rJTlh 9  
5.5kH$;>  
三、程序代码 |/K| Vwa  
l{7}3Am6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL x >ah,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {nmu(E P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g*b`o87PI  
#if _MSC_VER > 1000 - 2L(])t6  
#pragma once r:V bjmL  
#endif // _MSC_VER > 1000 L!xFhVA<  
#ifndef __AFXWIN_H__ Q(f0S  
#error include 'stdafx.h' before including this file for PCH 5L c@=,/0  
#endif H"/ J R  
#include "resource.h" // main symbols aaU4Jl?L  
class CHookApp : public CWinApp ]z'L1vQl7  
{ \L(jNN0_R  
 public: bWA_a]G  
  CHookApp(); 9!jF$  
  // Overrides I+ |uyc  
  // ClassWizard generated virtual function overrides %EU_OS(u.{  
  //{{AFX_VIRTUAL(CHookApp) F8?,}5j  
 public: iqR6z\p&  
  virtual BOOL InitInstance(); FBl,Mky  
  virtual int ExitInstance();  {8K  
  //}}AFX_VIRTUAL Z~SAlh T  
  //{{AFX_MSG(CHookApp) :? B4q#]N  
  // NOTE - the ClassWizard will add and remove member functions here. *N$XQ{o  
  // DO NOT EDIT what you see in these blocks of generated code ! u;9iuc` *  
  //}}AFX_MSG fh`Y2s|:7R  
  DECLARE_MESSAGE_MAP() Mk#r_:[BS  
}; nX:E(9q7c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "}_ J"%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,5zY1C==Ut  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1L::Qu%E  
BOOL InitHotkey(); A~Sc ] M  
BOOL UnInit(); (DvPdOT+3  
#endif Y[L,rc/j  
|5(un#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. o+hp#e  
#include "stdafx.h" %6(\Ki6I  
#include "hook.h" =k<b* 8  
#include <windowsx.h> "*#f^/LS  
#ifdef _DEBUG eWqS]cM#  
#define new DEBUG_NEW Pa{DB?P  
#undef THIS_FILE LIG@`  
static char THIS_FILE[] = __FILE__; /ZiMD;4@y  
#endif lB _9b_|2  
#define MAX_KEY 100 Z]Xa:[  
#define CTRLBIT 0x04 qGag{E5!  
#define ALTBIT 0x02  je$H}D  
#define SHIFTBIT 0x01 ~Zsj@d  
#pragma data_seg("shareddata") (+v':KH3_  
HHOOK hHook =NULL; 7a9">:~  
UINT nHookCount =0; D>jtz2y=D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8#$HKWUK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT BD]J/o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,9G'1%z,  
static int KeyCount =0; xytWE:=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift agfDx ^,  
#pragma data_seg() L$c 1<7LU  
HINSTANCE hins; B> E4,"  
void VerifyWindow(); 7Q{&L#;  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b [HnhAI  
//{{AFX_MSG_MAP(CHookApp) x=>dmi3  
// NOTE - the ClassWizard will add and remove mapping macros here. 0>j0L8#^p  
// DO NOT EDIT what you see in these blocks of generated code! ds(X[7XGW  
//}}AFX_MSG_MAP / P@P1l|I  
END_MESSAGE_MAP() Uot(3p!S6  
D A=LR  
CHookApp::CHookApp() W\B@0Iso  
{ DOtz  
 // TODO: add construction code here, H$?MPA-c  
 // Place all significant initialization in InitInstance 2A  
} ~L&z? 'V  
G?F!Z"S  
CHookApp theApp; Ke^/aGi}O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) IrRy1][Qr  
{ "T /$K  
 BOOL bProcessed=FALSE; &O+S [~  
 if(HC_ACTION==nCode) |b@`ykD  
 { /b{@']  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z-t qSw8n  
   switch(wParam) qK;J:GT>  
   { GKg #nXS  
    case VK_MENU: JqLPJUr  
     MaskBits&=~ALTBIT; *RJD^hu  
     break; A\mSS  
    case VK_CONTROL: SKf;Fe  
     MaskBits&=~CTRLBIT; ^K`PYai  
     break; " ?aE3$/  
    case VK_SHIFT: 7h/Mkim$5  
     MaskBits&=~SHIFTBIT; d>J +7ex+  
     break; KDg%sgRu}  
    default: //judge the key and send message /FXb,)1t  
     break; 1h(n}u  
   } ;(E]mbV'=  
   for(int index=0;index<MAX_KEY;index++){ 1| WDbk  
    if(hCallWnd[index]==NULL) D {E,XOi  
     continue; 0RdW.rZJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hT =E~|O  
    { O:V.;q2]U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *W |  
     bProcessed=TRUE; Q.4+"JoG  
    } {3os9r,  
   } $!'Vn)Z7  
  } (Ms #)E  
  else if((lParam&0xc000ffff)==1){ //Key down ?aaYka]  
   switch(wParam) ]S(nA!]  
   { }cW8B"_"  
    case VK_MENU: hHEn  
     MaskBits|=ALTBIT; QWm g#2'  
     break; Rz>@G>b:  
    case VK_CONTROL: p*$=EomY  
     MaskBits|=CTRLBIT; (8S+-k?  
     break; 4nd)*0{ f  
    case VK_SHIFT: >PWDo  
     MaskBits|=SHIFTBIT; :`yW^b  
     break; !=vsY]  
    default: //judge the key and send message KdlUa^}D  
     break; %MtaWZ  
   } :q1j?0 {2N  
   for(int index=0;index<MAX_KEY;index++) bneP>Bd  
   { A{{rNbCK  
    if(hCallWnd[index]==NULL) q2Gm8>F1y.  
     continue; iF##3H$c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L!5="s[}  
    { F ww S[ 3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); J=t}N+:F`b  
     bProcessed=TRUE; LD|T1 .  
    } *bcemH8f  
   } ywjD.od"v  
  } 4}Os>M{k  
  if(!bProcessed){ >4lA+1JYk  
   for(int index=0;index<MAX_KEY;index++){ ] C_$zbmi  
    if(hCallWnd[index]==NULL) /#x0?d {5  
     continue; 4GJx1O0Ol  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^7kYG7/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -k,}LJjo  
   } D#ED?Lqf  
  } PVq y\i  
 } #R= 6$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g>?,,y6/w  
} (=53WbOh/t  
cpq0' x\  
BOOL InitHotkey() O,&p"K&Z  
{ %[?{H} y  
 if(hHook!=NULL){ S`spUq1o  
  nHookCount++; 8 =3#S'n  
  return TRUE; o2y #Yk  
 } SsL>K*t5  
 else tdi}P/x  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,-1taS  
  if(hHook!=NULL) AIQ]lQ(  
   nHookCount++; I} ]s(  
  return (hHook!=NULL); oM}P Wf-  
} )Vy}oFT\  
BOOL UnInit() 6:bvq?5a5  
{ Ga"<qmLMc  
 if(nHookCount>1){ Zg;Ht  
  nHookCount--; bu\D*-  
  return TRUE; g;nPF*(  
 } ?P2 d 9b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OB+I.qlHP  
 if(unhooked==TRUE){ sgeME^v  
  nHookCount=0; rI]n4>k{  
  hHook=NULL; D7N` %A8   
 } "OKsl2e  
 return unhooked; yc$8X sns  
} }'TZ)=t{J  
TSd;L u%hr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !B*d,_9 c  
{ :B_ itl0{e  
 BOOL bAdded=FALSE; !8%{(;(  
 for(int index=0;index<MAX_KEY;index++){ aQfrDM<*XS  
  if(hCallWnd[index]==0){ (XA]k%45  
   hCallWnd[index]=hWnd; h,Tsb:Q"M  
   HotKey[index]=cKey; 1QDAfRx  
   HotKeyMask[index]=cMask; (/_Z^m9   
   bAdded=TRUE; )Chx,pcx<  
   KeyCount++; /aMeKM[L`  
   break; TCO^9RP<  
  } O7Awti-X  
 } WXE{uGc  
 return bAdded; DvXbbhp  
} \C E8S+Z%  
.SSj=q4?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @y\M8C8  
{ @7B!(Q  
 BOOL bRemoved=FALSE; .zyi'Kj  
 for(int index=0;index<MAX_KEY;index++){ y>m=A41:g  
  if(hCallWnd[index]==hWnd){ XS"lR |  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yu62$ d  
    hCallWnd[index]=NULL; 9k!#5_ M  
    HotKey[index]=0; (A8X|Y  
    HotKeyMask[index]=0; `_&7-;)i*\  
    bRemoved=TRUE; !xh.S#B  
    KeyCount--; V,Br|r$l(  
    break; 4qEeN-6h  
   } GCPSe A~cx  
  } [VwoZX:  
 } (%EhkTb  
 return bRemoved; IE9A _u*  
} i(XqoR-x  
7L&=z$U@m  
void VerifyWindow() G8oOFBQD  
{ {oN7I'>  
 for(int i=0;i<MAX_KEY;i++){ i50^%,  
  if(hCallWnd!=NULL){ }M9L,O*^   
   if(!IsWindow(hCallWnd)){ {e8.E<f-  
    hCallWnd=NULL; 9y"*H2$#  
    HotKey=0; 7w{>bYP  
    HotKeyMask=0; lGZ^ 8  
    KeyCount--; JB= L\E}  
   } u=h/l!lR  
  } W.u}Q@  
 } vL7 JzSU_  
} eu|cQ^>  
gaw/3@  
BOOL CHookApp::InitInstance() }@:vq8%Q  
{ q\g|K3V)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !'^gqaF+  
 hins=AfxGetInstanceHandle(); 0X3kVm <  
 InitHotkey(); [MKL>\U  
 return CWinApp::InitInstance(); m[FH>  
} Yl#r9TM  
EBN'u&zX  
int CHookApp::ExitInstance() @9^ozgg  
{ ~vIQ-|8r:  
 VerifyWindow(); ^SKuX?f\  
 UnInit(); HW(cA}$  
 return CWinApp::ExitInstance(); Q<V?rPAcx  
}  *w538Vb  
V '4sOn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q}M% \v  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) r0)X]l7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \j]i"LpWb  
#if _MSC_VER > 1000 }?=$?3W  
#pragma once .* xaI+:  
#endif // _MSC_VER > 1000 wh@;$s"B  
Ul@yXtj  
class CCaptureDlg : public CDialog + AyrKs?h  
{ &i,xod6$  
 // Construction gzthM8A  
 public: ?HBNd&gZ1G  
  BOOL bTray; 0;j)rmt  
  BOOL bRegistered; ~P85Or  
  BOOL RegisterHotkey(); hYMo5?  
  UCHAR cKey; V!F# ek:  
  UCHAR cMask; <m#ov G6  
  void DeleteIcon(); "$*&bC#dE  
  void AddIcon(); B#_<?  
  UINT nCount; Vs)Pg\B?  
  void SaveBmp(); d tw4cG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  ((}T^  
  // Dialog Data tN=B9bm3j  
  //{{AFX_DATA(CCaptureDlg) R(sPU>`MX  
  enum { IDD = IDD_CAPTURE_DIALOG }; p#UrZKR  
  CComboBox m_Key; _>8ZL)NQQ  
  BOOL m_bControl; W4Ey]y"  
  BOOL m_bAlt; wtCz%!OYB  
  BOOL m_bShift; WCc,RI0   
  CString m_Path; %># VhK  
  CString m_Number; %(IkUD  
  //}}AFX_DATA oZkjg3  
  // ClassWizard generated virtual function overrides YzqUOMAt"V  
  //{{AFX_VIRTUAL(CCaptureDlg) I65W^b4y  
 public: gUs.D_*  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ao]Dm#HiO  
 protected: ua%$r[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SM2QF  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9@LL_r`?<  
  //}}AFX_VIRTUAL N|OI~boV%  
  // Implementation oz(V a!  
 protected: x roo_  
  HICON m_hIcon; ~.?,*q7  
  // Generated message map functions iX]Vkx  
  //{{AFX_MSG(CCaptureDlg) t%$>  
  virtual BOOL OnInitDialog(); nCZ&FNi{O~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam);  x w8 e  
  afx_msg void OnPaint(); X!,2/WT  
  afx_msg HCURSOR OnQueryDragIcon(); |kPjjVGF{  
  virtual void OnCancel(); AM4lAq_  
  afx_msg void OnAbout(); ,Q8[Ur? G  
  afx_msg void OnBrowse(); Y[l*>}:w  
  afx_msg void OnChange(); #)&kF+  
 //}}AFX_MSG :C*7 DS  
 DECLARE_MESSAGE_MAP() +>b~nK>M  
};  uIOnP  
#endif v803@9@  
(7l'e=J0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cn62:p]5  
#include "stdafx.h" ?RyeZKf  
#include "Capture.h" 0x&-/qce6W  
#include "CaptureDlg.h" *E*= ;BG  
#include <windowsx.h> Ah5`Cnv  
#pragma comment(lib,"hook.lib") [Yr }:B <  
#ifdef _DEBUG 3K2B7loD)~  
#define new DEBUG_NEW 'MLp*3djF,  
#undef THIS_FILE 0!<qfT a  
static char THIS_FILE[] = __FILE__; u^HC1r|%  
#endif dwd5P7  
#define IDM_SHELL WM_USER+1 z'=8U@P'#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lyY\P6 X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e[<vVe!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; B 2p/  
class CAboutDlg : public CDialog gD}lDK6N  
{ 00jWs@K  
 public: Q&j-a;L  
  CAboutDlg(); z TYHwx  
  // Dialog Data +ZFw3KEkz  
  //{{AFX_DATA(CAboutDlg) 7+_TdDBYs  
  enum { IDD = IDD_ABOUTBOX }; }q<p;4<\F  
  //}}AFX_DATA 0&M~lJ  
  // ClassWizard generated virtual function overrides uDhe )  
  //{{AFX_VIRTUAL(CAboutDlg) "Y%fk/v8  
 protected: '%Cc!63t*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :1>h,NKC>  
  //}}AFX_VIRTUAL ~ _ ogeD  
  // Implementation 2/XrorV  
 protected: b 6kDkE  
  //{{AFX_MSG(CAboutDlg) bSa%?laS  
  //}}AFX_MSG } Xbmb8  
  DECLARE_MESSAGE_MAP() j<"@ Y7  
}; /e/%mo  
E}?n^Zf  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _}bs0 kIz  
{  cs+;ijp  
 //{{AFX_DATA_INIT(CAboutDlg) b |SDg%e  
 //}}AFX_DATA_INIT 5;WESk  
} s fD@lW3  
S vTd#>ke  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~Up5+7k@  
{ -!o*A>N  
 CDialog::DoDataExchange(pDX); Pz\4#E]  
 //{{AFX_DATA_MAP(CAboutDlg) (G1KMy  
 //}}AFX_DATA_MAP 8jBrD1  
} @:,B /B;  
f.yvKi.Cm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) k^VL{z:EWB  
 //{{AFX_MSG_MAP(CAboutDlg) ,> Ya%;h2k  
 // No message handlers zR@4Z>6   
 //}}AFX_MSG_MAP azhilUD8  
END_MESSAGE_MAP() \#50; 8VJ  
~F [V  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %C[#:>'+  
: CDialog(CCaptureDlg::IDD, pParent) g=#Cc( q  
{ 4{PN9i E  
 //{{AFX_DATA_INIT(CCaptureDlg) O)N$nBnp  
  m_bControl = FALSE; ,xSNTOJ  
  m_bAlt = FALSE; e1<9:h+  
  m_bShift = FALSE; =EJ8J;y_f  
  m_Path = _T("c:\\"); |WkWZZ^  
  m_Number = _T("0 picture captured."); V;pR w`  
  nCount=0; 1tZ7%0R\g]  
  bRegistered=FALSE; X%C`('"R  
  bTray=FALSE; ZVX1@p  
 //}}AFX_DATA_INIT B4 k5IS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *A&A V||q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); PF+F^;C  
} wI5(`_l{G  
I K9plsd*  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Oj=g;iY  
{ wZUZ"Y}9  
 CDialog::DoDataExchange(pDX); #]rfKHW9  
 //{{AFX_DATA_MAP(CCaptureDlg) G;ihm$Cad  
  DDX_Control(pDX, IDC_KEY, m_Key); $~3?nib"j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); O*SJx.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FOyANN'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); R$Rub/b6  
  DDX_Text(pDX, IDC_PATH, m_Path); H\%^n<]#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); MZrLLnl6\  
 //}}AFX_DATA_MAP dz6&TdEl  
} Lo<WK  
?]%ZJd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i,h)V Cc  
//{{AFX_MSG_MAP(CCaptureDlg) T^ )\  
 ON_WM_SYSCOMMAND() 9^?2{aP%  
 ON_WM_PAINT() SuR+Vv  
 ON_WM_QUERYDRAGICON() d53Eu`QW?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w#d7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !U7}?i&H  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sC'PtFK8z  
//}}AFX_MSG_MAP ).32Im!;#R  
END_MESSAGE_MAP() >6KwZr BB  
aCRiW;+'  
BOOL CCaptureDlg::OnInitDialog() #Zg pm"MW  
{ ~hxW3e  
 CDialog::OnInitDialog(); YB+My~fw{l  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2!)|B ;y  
 ASSERT(IDM_ABOUTBOX < 0xF000); g#iRkz%l)&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Vl^p3f[  
 if (pSysMenu != NULL) 3^Q;On|  
 { {_G_YL[  
  CString strAboutMenu; 5(>ux@[qI:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); cd&sAK"  
  if (!strAboutMenu.IsEmpty()) 8kf5u#,'  
  { V8O-|7H$ v  
   pSysMenu->AppendMenu(MF_SEPARATOR); Eo`'6 3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); BhUGMK  
  } m0i,Zw{eM  
 } g [u*`]-;v  
 SetIcon(m_hIcon, TRUE); // Set big icon :bq$ {  
 SetIcon(m_hIcon, FALSE); // Set small icon *L&|4|BF2  
 m_Key.SetCurSel(0); r,<p#4(>_  
 RegisterHotkey(); W5uC5C*,l  
 CMenu* pMenu=GetSystemMenu(FALSE); bXz*g`=;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _<6E>"*m  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hRQw]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $ghlrV;:ct  
 return TRUE; // return TRUE unless you set the focus to a control b:PzqMh{G  
} B un^EJ)  
Xf;_r+;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mwMcAUD]2  
{ ,`ba?O?*G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?>1wZ  
 { i'B$Xr  
  CAboutDlg dlgAbout; Ou_2UT  
  dlgAbout.DoModal(); 2U`!0~pod  
 } ^v&"{2  
 else F]L96&  
 { ?BX}0RWMh7  
  CDialog::OnSysCommand(nID, lParam); '};mBW4z  
 } \Ez&?yb/  
} '=+gwe M  
^U6VJ(58P  
void CCaptureDlg::OnPaint() gg.lajX  
{ U]&/F{3 im  
 if (IsIconic()) K1=j7  
 { ?L|Ai\|  
  CPaintDC dc(this); // device context for painting 0Q~\1D 9g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^)o#/"JA  
  // Center icon in client rectangle k]9y+WC2  
  int cxIcon = GetSystemMetrics(SM_CXICON); }ww`Y&#  
  int cyIcon = GetSystemMetrics(SM_CYICON); :(K JLa]  
  CRect rect; j|>^wB  
  GetClientRect(&rect); B2:GGZ|jS  
  int x = (rect.Width() - cxIcon + 1) / 2; v\g1 w&PN  
  int y = (rect.Height() - cyIcon + 1) / 2; EeQ2\'t  
  // Draw the icon w0O(>  
  dc.DrawIcon(x, y, m_hIcon); _&M^}||UH  
 } yBCLS550  
 else BQ=JZ4&  
 { ezA&cZ5  
  CDialog::OnPaint(); ,b<m],p  
 } mYqLqezAA  
} A>f rf[fAW  
*|^|| bd  
HCURSOR CCaptureDlg::OnQueryDragIcon() RS|*3 $1  
{ `Bb32L   
 return (HCURSOR) m_hIcon; ~ %Ij5PD  
} Z6nQW53-  
FP")$ ,=s  
void CCaptureDlg::OnCancel() Ih[k{p  
{ ltv ~Kh  
 if(bTray) ctPT=i60  
  DeleteIcon(); ~i]4~bkH2  
  CDialog::OnCancel(); s w50lId  
} YlXqj\a  
`[h&Q0Du6  
void CCaptureDlg::OnAbout() braI MIQ`  
{ FzF#V=9lP  
 CAboutDlg dlg; %v0;1m  
 dlg.DoModal(); ky'G/ z  
} &{bNa:@  
(/S6b  
void CCaptureDlg::OnBrowse() TCK#bJ  
{ {]iM5?  
 CString str;  zj$Ve  
 BROWSEINFO bi; I/zI\PP,  
 char name[MAX_PATH]; #@ F   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); RLO<5L  
 bi.hwndOwner=GetSafeHwnd(); @o&UF-=MW(  
 bi.pszDisplayName=name; EvT"+;9/p  
 bi.lpszTitle="Select folder"; ($!g= 7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;)vs=DK:)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4O4}C#6(4  
 if(idl==NULL) z`YAOhD*h4  
  return; 8mC$p6Okd  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (S_1C,  
 str.ReleaseBuffer(); p::`1  
 m_Path=str; @vO~'Xxq!  
 if(str.GetAt(str.GetLength()-1)!='\\') Hn]6re  
  m_Path+="\\"; ItE)h[86  
 UpdateData(FALSE); @>F`;'_*z  
} !>fi3#Fi  
WHr:M/qD  
void CCaptureDlg::SaveBmp() v?o("I[ C  
{ pIPjTQ?cq  
 CDC dc; Gb.}af#v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^Yo2R  
 CBitmap bm; )o;n2T#O  
 int Width=GetSystemMetrics(SM_CXSCREEN); FX+^S?x.  
 int Height=GetSystemMetrics(SM_CYSCREEN); =%{E^z>1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); SJlL!<i$  
 CDC tdc; b~?3HY:t~K  
 tdc.CreateCompatibleDC(&dc); w ; PV &M  
 CBitmap*pOld=tdc.SelectObject(&bm); A QPzId*z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6-\C?w A  
 tdc.SelectObject(pOld); N::.o+1  
 BITMAP btm; 'EB5#  
 bm.GetBitmap(&btm); b{,vZhP-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j?(@x>HA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .p'\@@o5  
 BITMAPINFOHEADER bih; #B__-"cRv  
 bih.biBitCount=btm.bmBitsPixel; DCgiTT\  
 bih.biClrImportant=0; 7??j}ob>  
 bih.biClrUsed=0; ( `d_DQ  
 bih.biCompression=0; ah!fQLMH  
 bih.biHeight=btm.bmHeight; /4 .]L~  
 bih.biPlanes=1; 9$^v*!<z\  
 bih.biSize=sizeof(BITMAPINFOHEADER); KA."[dVa  
 bih.biSizeImage=size; +}C M2>M  
 bih.biWidth=btm.bmWidth; T_qh_L3  
 bih.biXPelsPerMeter=0; u73/#!(1=H  
 bih.biYPelsPerMeter=0; V6b)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Yt;@ @xe&  
 static int filecount=0; mZ.E;X& ,*  
 CString name; wQU-r|  
 name.Format("pict%04d.bmp",filecount++); r]%.,i7~8  
 name=m_Path+name; 30h1)nQ$h}  
 BITMAPFILEHEADER bfh; R[2h!.O8  
 bfh.bfReserved1=bfh.bfReserved2=0; `4"&_ltD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 9-?kamA  
 bfh.bfSize=54+size; y9Q"3LLic`  
 bfh.bfOffBits=54; e0<L^|S  
 CFile bf; ^j'vM\^`ml  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ntF#x.1Pm  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0.!Q 4bhD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); gR{.0e  
  bf.WriteHuge(lpData,size); q?oJ=]m"  
  bf.Close(); 7 P]Sc   
  nCount++; +e) RT<  
 } dYhLk2  
 GlobalFreePtr(lpData); mWU*}-M  
 if(nCount==1) Q$2^m(?;  
  m_Number.Format("%d picture captured.",nCount); |)Sx"B)  
 else tA9(N>[ *  
  m_Number.Format("%d pictures captured.",nCount); 1;9  %L@  
  UpdateData(FALSE); CYC6:g|)  
} Ox f,2r  
qzu%Pp6If  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }u'O<d~z?  
{ Uf-`g>  
 if(pMsg -> message == WM_KEYDOWN) DYCXzFAa  
 { 1H,hw  
  if(pMsg -> wParam == VK_ESCAPE) 3yIC@>&y(8  
   return TRUE; ,6a }l;lv  
  if(pMsg -> wParam == VK_RETURN) d*<goBd  
   return TRUE; U_e e3KKA  
 } p%*! ]JRS  
 return CDialog::PreTranslateMessage(pMsg); |y7#D9m  
} %LZf= `:(  
d:=:l?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2BIOA#@t  
{ x20sB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >5-]Ur~  
  SaveBmp(); V %Rz(a+c  
  return FALSE; pi?U|&.1z  
} %GDs/9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Gnmxp%&}P|  
 CMenu pop; Yim`3>#t  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); eVy\)dCsU  
 CMenu*pMenu=pop.GetSubMenu(0); ]#oqum@Yf1  
 pMenu->SetDefaultItem(ID_EXITICON); (#k2S-5  
 CPoint pt; ^7% KS  
 GetCursorPos(&pt); B\Y !5$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S#, E)h/  
 if(id==ID_EXITICON) f<G:}I  
  DeleteIcon(); )haHI)xR  
 else if(id==ID_EXIT) *G0r4Ui$  
  OnCancel(); -* ;`~5  
 return FALSE; Fh$Xcz~i  
} ^!>o5Y)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @uI_4a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v:$Y |mh  
 AddIcon(); jP|(y]!  
 return res; TJp0^&Q  
} :j0r~*z-  
(s.S n(E  
void CCaptureDlg::AddIcon() {pNf& '  
{ 9}6^5f?|  
 NOTIFYICONDATA data; =24<d!R  
 data.cbSize=sizeof(NOTIFYICONDATA); yasKU6^R'  
 CString tip; 1(z+*`"WB&  
 tip.LoadString(IDS_ICONTIP); .EUOKPK4W  
 data.hIcon=GetIcon(0); YG6Kvc6T  
 data.hWnd=GetSafeHwnd(); (eAh8^)  
 strcpy(data.szTip,tip); UZ+FV;<  
 data.uCallbackMessage=IDM_SHELL; Bx32pY  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a<K@rgQ  
 data.uID=98; f<0nj?  
 Shell_NotifyIcon(NIM_ADD,&data); ~8G<Nw4*\  
 ShowWindow(SW_HIDE); L3- tD67oa  
 bTray=TRUE; :S5B3S@|  
} D;al(q  
vMOit,{  
void CCaptureDlg::DeleteIcon() jVpk) ;vC  
{ _'E,g@  
 NOTIFYICONDATA data; ` `R;x  
 data.cbSize=sizeof(NOTIFYICONDATA); {?9s~{Dl  
 data.hWnd=GetSafeHwnd(); 0BTLIV$d;  
 data.uID=98; Tfl4MDZb  
 Shell_NotifyIcon(NIM_DELETE,&data); 7)Rx-  
 ShowWindow(SW_SHOW); Y-WY Q{  
 SetForegroundWindow(); -*EK-j  
 ShowWindow(SW_SHOWNORMAL); KwiTnP!Dca  
 bTray=FALSE; KD7 RI3'?  
} cTeEND)  
It@ak6u?  
void CCaptureDlg::OnChange() nUvxO `2  
{ b%<i&YY#  
 RegisterHotkey(); 7=ZB?@bU~  
} NwdA@"YQ|  
@u2nG:FG  
BOOL CCaptureDlg::RegisterHotkey() 8vcV-+x  
{ XK>/i}y  
 UpdateData(); O`hOVHD Q  
 UCHAR mask=0; jo4*,B1x  
 UCHAR key=0; _KkLH\1g$  
 if(m_bControl) V4OhdcW{  
  mask|=4; ~a5p_xP  
 if(m_bAlt) [EJ[Gg0m  
  mask|=2; Kj_hCSvf3e  
 if(m_bShift) _azg 0.)  
  mask|=1; l*]*.?m/5  
  key=Key_Table[m_Key.GetCurSel()]; +BRmqJ3  
 if(bRegistered){ HX{O@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >]k'3|vV  
  bRegistered=FALSE; yjVPaEu]aU  
 } <"@~  
 cMask=mask; :sBg+MS  
 cKey=key; %jY /jp=R  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n@xDFa  
 return bRegistered; gC#PqK~  
} xh\{ dUPA  
Y$ ;C@I  
  四、小结 vb}; _/ #?  
+QIM~tt)  
  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:
3+5=?,请输入中文答案:八 正确答案:八