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
  • 7663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: fY6&PuDf.  
  Uh7kB`2  
  一、实现方法 !X,=RR `zT  
q= tDMK'h  
  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: ?^6RFbke+  
9EH%[wfv  
#pragma data_seg("shareddata") V1Fdt+#  
HHOOK hHook =NULL; //钩子句柄 LOOv8'%O8  
UINT nHookCount =0; //挂接的程序数目 )>?K:y8I~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 apYf,"|9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N(IUNL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey irL ehPX9  
static int KeyCount =0; iKdC2m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (yZ^Y'0  
#pragma data_seg() PmTA3aH  
:oZ30}  
  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。 L>PpXTWwy  
kdF# Nm  
  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: `5gcc7b  
x JepDCUJ>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T{ojla(  
cKey,UCHAR cMask) ]6(NeS+  
{ A\?O5#m:$  
 BOOL bAdded=FALSE; ;,F}!R  
 for(int index=0;index<MAX_KEY;index++){ *W0`+#Dcv  
  if(hCallWnd[index]==0){ DsP+#PX  
   hCallWnd[index]=hWnd; Nlo*vu  
   HotKey[index]=cKey; \K>6-0r|  
   HotKeyMask[index]=cMask; } $OQw'L[  
   bAdded=TRUE;  _@HMk"A  
   KeyCount++; _E?(cWC  
   break; W;o\}irep  
  } gjwp' GN  
 } .m4K ]^m  
 return bAdded; dvUJk<;w  
} jd$lu^>I  
//删除热键 x0 j$]$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g#H#i~E^  
{ hd '!f  
 BOOL bRemoved=FALSE; 0z%]HlPg  
 for(int index=0;index<MAX_KEY;index++){ 6>KDK<5NQ  
  if(hCallWnd[index]==hWnd){ 3s$m0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -\r*D#aHBN  
    hCallWnd[index]=NULL; VpD9!;S  
    HotKey[index]=0; N L~}  
    HotKeyMask[index]=0; iJ#sg+  
    bRemoved=TRUE; 2.CI^.5&  
    KeyCount--; Gm_Cq2PD(  
    break; 92S<TAdPP  
   } CjD2FnjT  
  } I|08[ mO  
 } yA6"8fr  
 return bRemoved; rH & ^SNc  
} I*'QD)  
S=o Ab&  
j'v2m6/  
  DLL中的钩子函数如下: xeZ,}YP)  
A]W`r}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?-Oy/Y K  
{ 2pZ|+!xc+  
 BOOL bProcessed=FALSE; 6\ (\  
 if(HC_ACTION==nCode) $Y>LUZ)b&8  
 { v k<By R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;ML21OjgN  
   switch(wParam) .( 75.^b2)  
   {  2#p6.4h=  
    case VK_MENU: rq+E"Uj?  
     MaskBits&=~ALTBIT; )x8Izn  
     break; P1)9OE  
    case VK_CONTROL: Azu$F5G!n  
     MaskBits&=~CTRLBIT; R ]HHbD&;  
     break; & [4Gv61  
    case VK_SHIFT: _g 3hXsA  
     MaskBits&=~SHIFTBIT; Un7jzAvQ  
     break; MdCEp1Z  
    default: //judge the key and send message :+en8^r%  
     break; f%d7?<rw  
   } U%"v7G-  
   for(int index=0;index<MAX_KEY;index++){ sJMT _yt;  
    if(hCallWnd[index]==NULL) ]iYjS  
     continue; : 3*(kb1)&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tP7l ;EX4  
    { IJ[#$I+Z%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z[[|'02{  
     bProcessed=TRUE; F"~uu9u  
    } ?!cUAa>iH  
   } f)/Yru. ;  
  } j<e`8ex?  
  else if((lParam&0xc000ffff)==1){ //有键按下 I6zKvP8pb  
   switch(wParam) ':6`M  
   { &*A7{76x  
    case VK_MENU: 5Z1b9.;.,  
     MaskBits|=ALTBIT; Y!"LrkC  
     break; 0c /xE<h  
    case VK_CONTROL: \"|E8A6/  
     MaskBits|=CTRLBIT; 6f{Kj)  
     break; ):kDWc  
    case VK_SHIFT: l/#;GYB]  
     MaskBits|=SHIFTBIT; 48W$ ,  
     break; p^MV< }kk  
    default: //judge the key and send message 8<{)|GoqB  
     break; 6XKiVP;h%  
   } bw&8"k>D?  
   for(int index=0;index<MAX_KEY;index++){ Jvgx+{Xu  
    if(hCallWnd[index]==NULL) Q6]SsV?x  
     continue; o@XhL9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p0>W}+8fF  
    { *FmY4w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v[A)r]"j"M  
     bProcessed=TRUE; ^FIpkhw  
    } J7c(qGJI2  
   } .T#h5[S2x  
  } bM+}j+0  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0X !A'  
   for(int index=0;index<MAX_KEY;index++){ |eU{cK~e^  
    if(hCallWnd[index]==NULL) au1uFu-  
     continue; !EB<e5}8wK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F4`ud;1H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4|ML#aRz  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _H} 8eU  
   } ?:H4Xd7  
  } e5W 8YNA  
 } W+k SL{0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #R-l2OO^]  
} : M=0o<  
U["'>&B  
  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: (kCzz-_\  
w&8N6gA14  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5%Hw,h   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qT5q3A(8  
Bi:%}8STH  
  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: 62)Qr  
avxr|uk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FN0)DN2d}  
{ waT'|9{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Kg4\:A7Sa.  
 { bys5IOP{]o  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 KW`^uoY$  
  SaveBmp(); 9EHhVi  
  return FALSE; g3B%}!|  
 } zZR_&z<  
 …… //其它处理及默认处理 pL 2P .  
} = hL;Q@inb  
~XU%_Hz  
y=.`:EB9b  
  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。 ktF\f[  
a=@]Ov/  
  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。 C%&A9(jG  
wGy`0c]v?  
  二、编程步骤 K@U[x,Sx  
uW;[FTcqy$  
  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"; > oh7f|  
f"9aL= 3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2PZ#w(An&  
S*PcK>  
  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; bAOL<0RS9`  
@-zL"%%dw'  
  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; N_L~oX_  
_Fe%Ek1Yy  
  5、 添加代码,编译运行程序。 wB'GV1|jL  
=^ZDP1h/}  
三、程序代码 IE]? WW5  
9 696EQ,I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL fj"1TtPq#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V) xwlvX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U-+o6XX  
#if _MSC_VER > 1000 'wyS9^F  
#pragma once l;7T.2J'Z  
#endif // _MSC_VER > 1000 qL2!\zt>g  
#ifndef __AFXWIN_H__ E>_N|j)9  
#error include 'stdafx.h' before including this file for PCH 1#tFO  
#endif n Nu~)X  
#include "resource.h" // main symbols {gT4Oq__  
class CHookApp : public CWinApp {3Y R_^>?  
{ = q \TWz  
 public: yjE $o?A  
  CHookApp(); emT/5'y  
  // Overrides \gCh'3  
  // ClassWizard generated virtual function overrides nz2`YyR  
  //{{AFX_VIRTUAL(CHookApp) W79Sz}):  
 public: FHbyL\Q  
  virtual BOOL InitInstance(); K]SsEsd  
  virtual int ExitInstance(); OV2/?  
  //}}AFX_VIRTUAL +,xluwv$9  
  //{{AFX_MSG(CHookApp) xyzYY}PS  
  // NOTE - the ClassWizard will add and remove member functions here. 2p %j@O  
  // DO NOT EDIT what you see in these blocks of generated code ! M!tR>NMH  
  //}}AFX_MSG _~Id~b  
  DECLARE_MESSAGE_MAP() GHWt3K:*w  
}; mE"(d*fe'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); :@@aIFRv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]621Z1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4$oDq  
BOOL InitHotkey(); TTagZI$  
BOOL UnInit(); 0<FT=tKm  
#endif EQ [K  
L/ g8@G ;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zFi)R }Ot  
#include "stdafx.h" W\EvMV"  
#include "hook.h" l6T^e@*  
#include <windowsx.h> y0]"qB  
#ifdef _DEBUG \ gO!6  
#define new DEBUG_NEW ZHM NG~!  
#undef THIS_FILE Xk] uXx:TN  
static char THIS_FILE[] = __FILE__; !&adO,jN+=  
#endif %`bn=~T^  
#define MAX_KEY 100 +v+Dkyf:V  
#define CTRLBIT 0x04 y$8S+N?>  
#define ALTBIT 0x02 GLp~SeF#  
#define SHIFTBIT 0x01 1<G,0Lt  
#pragma data_seg("shareddata") )vD:  
HHOOK hHook =NULL; i~"lcgoO  
UINT nHookCount =0; U! $/'Xi9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qDS~|<Y5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <5!)5+G  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \_)[FC@  
static int KeyCount =0; M{t/B-'4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XUVBD;"f!  
#pragma data_seg() v%muno,  
HINSTANCE hins; .4J7 ^l  
void VerifyWindow(); 9fy[%M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b5)1\ANq  
//{{AFX_MSG_MAP(CHookApp) &q>C  
// NOTE - the ClassWizard will add and remove mapping macros here. 3!op'X!  
// DO NOT EDIT what you see in these blocks of generated code! Y41b8.|P+  
//}}AFX_MSG_MAP k x%\Cz  
END_MESSAGE_MAP() o&$Of  
T@xaa\bzg  
CHookApp::CHookApp() V'FKgzd  
{ uquY z_2  
 // TODO: add construction code here, .6c Bx  
 // Place all significant initialization in InitInstance OIs!,G|  
} {)I&&fSz  
 eIj2(q9  
CHookApp theApp; GdM|?u&s"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Mtaky=l8~I  
{ ,&iEn}xG7i  
 BOOL bProcessed=FALSE; /b]+RXvxj  
 if(HC_ACTION==nCode) #y8Esik  
 { }XD=N#p@z  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0.wNa~_G|  
   switch(wParam) bE!z[j]  
   { b63DD(  
    case VK_MENU: XnKf<|j6k  
     MaskBits&=~ALTBIT; [:/mjO K  
     break; ky{@*fg.  
    case VK_CONTROL: 1()pKBHf  
     MaskBits&=~CTRLBIT; T"e"?JSRJ  
     break; )TcD-Jr  
    case VK_SHIFT: 'soll[J  
     MaskBits&=~SHIFTBIT; C:_-F3|]cJ  
     break; MKh}2B#S  
    default: //judge the key and send message &8dj*!4H  
     break; TU1W!=Z  
   } ikb;,Js  
   for(int index=0;index<MAX_KEY;index++){ p#N2K{E  
    if(hCallWnd[index]==NULL) )0\D1IFJ  
     continue; "td ,YVK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ] u\-_PP  
    { K_Kz8qV.?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nj#kzD[n>  
     bProcessed=TRUE; 7yal  T.  
    }  [33=+C a  
   } #[]B: n6  
  } K8uqLSP '  
  else if((lParam&0xc000ffff)==1){ //Key down 6RfS_  
   switch(wParam) MFz6y":~  
   { +.a->SZ5"  
    case VK_MENU: *iUR1V Y  
     MaskBits|=ALTBIT; ?s]?2>p  
     break; ;y;UgwAM  
    case VK_CONTROL: M1eM^m8U  
     MaskBits|=CTRLBIT; :m0 pm@  
     break; { 3Qlx/6<  
    case VK_SHIFT: g6H`uO  
     MaskBits|=SHIFTBIT; t; @T~%  
     break; Dc3bG@K*G  
    default: //judge the key and send message @Ll^ze&HI  
     break; b~;M&Y  
   } {tuGkRY2 ~  
   for(int index=0;index<MAX_KEY;index++) *>T@3G.{Rm  
   { zCrM~  
    if(hCallWnd[index]==NULL) JD ~]aoH  
     continue; KkSv2 3In  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #;\tgUQ  
    { in>?kbaG+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Np?/r}  
     bProcessed=TRUE; >Ft:&N9L{  
    } RaA7 U   
   } ={I(i6  
  } [ z{ }?  
  if(!bProcessed){ qJK6S4O]  
   for(int index=0;index<MAX_KEY;index++){ "4CO^ B  
    if(hCallWnd[index]==NULL) ei @$_w*TH  
     continue; 8ZNwo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X1="1{8H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `8D'r|=`Eh  
   } bKQ-PM&I/t  
  } fK4NmdTV  
 } `<?((l%;R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FD.L{  
} Lmc"q FzK  
lmx'w  
BOOL InitHotkey() O*1la/~m  
{ fn.}LeeS>  
 if(hHook!=NULL){ t7/a5x  
  nHookCount++; !I Byv%m&\  
  return TRUE; b|U3\Fmc  
 } b(_PV#@$  
 else 8cbgP$X  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); - P'c0I9z  
  if(hHook!=NULL) #rx@ 2zi  
   nHookCount++; Bz6Zy)&sAL  
  return (hHook!=NULL); B0!W=T\  
} Gx-tPW}  
BOOL UnInit() IJ6&*t wT  
{ ETaLE[T%1  
 if(nHookCount>1){ ~ym-Szo  
  nHookCount--; ?Q: KW  
  return TRUE; zg{  
 } 1y.!x~Pi,  
 BOOL unhooked = UnhookWindowsHookEx(hHook); SI;SnF'[7  
 if(unhooked==TRUE){ _UUp+Hz  
  nHookCount=0; lLZ?&z$  
  hHook=NULL; sX]ru^F3  
 } C6c]M@6  
 return unhooked; @W!cC#u  
} D?P1\<A~  
#zKF/H|_R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -;U3$[T,J7  
{ yQ+C}8r5  
 BOOL bAdded=FALSE; {pEbi)CF,}  
 for(int index=0;index<MAX_KEY;index++){ U=ie| 3  
  if(hCallWnd[index]==0){ nNcmL/(  
   hCallWnd[index]=hWnd; u/4|Akui  
   HotKey[index]=cKey; zbP#y~[  
   HotKeyMask[index]=cMask; ~[ x}  
   bAdded=TRUE; !S[7IBk%  
   KeyCount++; sme!!+Rd  
   break; G 4 C 7  
  } i)+2? <]  
 } +FYhDB~m  
 return bAdded; eX9H/&g  
} -_~T;cj6  
6Er%td)f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2bt2h.a  
{ ;Z}V}B  
 BOOL bRemoved=FALSE; S-)%#  
 for(int index=0;index<MAX_KEY;index++){ \S"YLRn"  
  if(hCallWnd[index]==hWnd){ f m'Qif q^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ( O/+.qb  
    hCallWnd[index]=NULL; `xd{0EvF  
    HotKey[index]=0; 0x8aKq\'  
    HotKeyMask[index]=0; P6o-H$ a+  
    bRemoved=TRUE;  IQCIc@5  
    KeyCount--; 6WX+p3Kv  
    break; ue#Y h  
   } @@Vf"o+S  
  } ~<w9a]  
 } }u8D5Q<(  
 return bRemoved; GHo=)NTjy  
} (eJYv: ^  
-4'yC_8t  
void VerifyWindow() _J`q\N K  
{ pZe:U;bb  
 for(int i=0;i<MAX_KEY;i++){ zq&,KZ  
  if(hCallWnd!=NULL){ 0YVkq?1x9  
   if(!IsWindow(hCallWnd)){ xt"GO  b  
    hCallWnd=NULL; b<mxf\b  
    HotKey=0; /=2  
    HotKeyMask=0; YPqp#X*  
    KeyCount--; rocG;$[  
   } e6WKZ~ v o  
  } 6v}WdK  
 } QGV~Y+  
} >E`p@ e+  
2u|} gZts  
BOOL CHookApp::InitInstance() fdRw:K8  
{ G' 'l,\3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h_:|H8t;w  
 hins=AfxGetInstanceHandle(); QBiLH]qa  
 InitHotkey(); &r Lg/UEV-  
 return CWinApp::InitInstance(); $zuemjW3p  
} ?Em*yc@WD  
GP\Pk/E  
int CHookApp::ExitInstance() -w:F8k ~  
{ 7J@D})si  
 VerifyWindow(); =+j>?Yi  
 UnInit(); *PjW,   
 return CWinApp::ExitInstance(); aD:vNX  
} KW.QVBuVO#  
(C EXPf  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 30v 3C7o=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uZ(j"y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vQpR0IEf]e  
#if _MSC_VER > 1000 idr,s\$>  
#pragma once `Vqp o/  
#endif // _MSC_VER > 1000 aGY F\7  
51k^?5cO  
class CCaptureDlg : public CDialog 4(f4 4' ^  
{ |Skk1 #  
 // Construction 5B'};AQ  
 public: Zom7yI  
  BOOL bTray; tj_+0J$sw:  
  BOOL bRegistered; &[hq !v  
  BOOL RegisterHotkey(); &k+'TcWm  
  UCHAR cKey; 6n.W5 1g(s  
  UCHAR cMask; *M_Gu{xc  
  void DeleteIcon(); t3)nG8> )  
  void AddIcon(); j&. MT@  
  UINT nCount; 0?",dTf3i  
  void SaveBmp(); wcT0XXh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor jK^'s6i#  
  // Dialog Data =-c"~4  
  //{{AFX_DATA(CCaptureDlg) `"<} B"s  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6/Coi,om  
  CComboBox m_Key; &1DU]|RoT&  
  BOOL m_bControl; e'c~;Z\A  
  BOOL m_bAlt; FN&.PdRT  
  BOOL m_bShift; Q4_+3-g<7L  
  CString m_Path; 0 pH qNlb  
  CString m_Number; 12Hy.l  
  //}}AFX_DATA EQkv&k5X  
  // ClassWizard generated virtual function overrides \Om< FH}  
  //{{AFX_VIRTUAL(CCaptureDlg) iG1vy'J#o  
 public: ncluA~8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /?jAG3"  
 protected: $:%?-xy(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T/" 6iv\1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %<oey%ue  
  //}}AFX_VIRTUAL 9LkP*$2"M<  
  // Implementation uOqWMRsoi  
 protected: 1CiK&fQ'  
  HICON m_hIcon; tIgKnKr^)  
  // Generated message map functions aD~3C/?aW  
  //{{AFX_MSG(CCaptureDlg) m>gok0{pm  
  virtual BOOL OnInitDialog(); -O2ZrJ!q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); CqUK[#kW(  
  afx_msg void OnPaint(); a(X?N.w  
  afx_msg HCURSOR OnQueryDragIcon(); 'Dq!o[2y  
  virtual void OnCancel(); BC0T[o(f8  
  afx_msg void OnAbout(); x8 sSb:N  
  afx_msg void OnBrowse(); (L?fYSP!  
  afx_msg void OnChange(); JU7EC~7|2c  
 //}}AFX_MSG kne{Tp  
 DECLARE_MESSAGE_MAP() g(\FG  
}; 63d' fgVp  
#endif L[d 7@  
P+sxlf:0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )~<8j  
#include "stdafx.h" .,pGW8Js  
#include "Capture.h" zA&lJD $0  
#include "CaptureDlg.h" Kc*h@#`~oL  
#include <windowsx.h> i6zfr|`@  
#pragma comment(lib,"hook.lib") e`#c[lbAAM  
#ifdef _DEBUG Y?2I /  
#define new DEBUG_NEW f~u]fpkz  
#undef THIS_FILE 4}{HRs?  
static char THIS_FILE[] = __FILE__; ;f7(d\=y  
#endif q@ >s#  
#define IDM_SHELL WM_USER+1 jd$uOn.r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [ds:LQq)/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a[:0<Ek  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; n^|n6(EZ  
class CAboutDlg : public CDialog /lSz8h2  
{ -y{o@  
 public: VpJ/M(UD-  
  CAboutDlg(); ln7{c #lE  
  // Dialog Data @8TD^ub  
  //{{AFX_DATA(CAboutDlg) aD,sx#g0  
  enum { IDD = IDD_ABOUTBOX }; yVm~5Y&Z  
  //}}AFX_DATA bE2^sx`(  
  // ClassWizard generated virtual function overrides k~u$&a  
  //{{AFX_VIRTUAL(CAboutDlg) xT I&X9P  
 protected: )eNR4nF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support maLKUSgo  
  //}}AFX_VIRTUAL uYlC*z{  
  // Implementation }u&.n pc  
 protected: ewqfs/  
  //{{AFX_MSG(CAboutDlg) ^0 R.U+?+  
  //}}AFX_MSG d_*'5Eia6  
  DECLARE_MESSAGE_MAP() F kp;G  
}; lvIKL!;H  
>C~-*M9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D*Y4B ?,  
{ (b Q1,y  
 //{{AFX_DATA_INIT(CAboutDlg) ^ad p<?q4  
 //}}AFX_DATA_INIT g]R }w@nJ  
} M-u:8dPu  
<k'=_mC_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +qe!KPk2  
{ sTO*  
 CDialog::DoDataExchange(pDX); ci>+Zi6  
 //{{AFX_DATA_MAP(CAboutDlg) * c] :,5  
 //}}AFX_DATA_MAP  R:98'`X=  
} D[m;rcl  
U7.3`qd"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~]DGf(   
 //{{AFX_MSG_MAP(CAboutDlg) Qj? +R F6(  
 // No message handlers [y| "iSD  
 //}}AFX_MSG_MAP GFOd9=[  
END_MESSAGE_MAP() _e$15qW+  
A^_BK(EY  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Mf%0Cx `  
: CDialog(CCaptureDlg::IDD, pParent) ^!-*xH.dK  
{ .oYUA}  
 //{{AFX_DATA_INIT(CCaptureDlg) rIg1]q  
  m_bControl = FALSE; rG1l:Z)  
  m_bAlt = FALSE; Y@N}XH<4R  
  m_bShift = FALSE; 1`N q K  
  m_Path = _T("c:\\"); }3F8[Td.~N  
  m_Number = _T("0 picture captured."); FyX\S=  
  nCount=0; 4mJ4)  
  bRegistered=FALSE; ~`c?&YixU  
  bTray=FALSE; -Zd!0HNW1  
 //}}AFX_DATA_INIT <<gk< _7`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YYHtd,0\+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2e zQX2q  
} CN@bJo2  
<\GP\G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2J =K\ L  
{ LFob1HH*8  
 CDialog::DoDataExchange(pDX); Z:W6@j-~  
 //{{AFX_DATA_MAP(CCaptureDlg) *{8K b>D  
  DDX_Control(pDX, IDC_KEY, m_Key); g4(B=G\j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); q' 77BRD3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); O^48c$Apv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); x):cirwkl  
  DDX_Text(pDX, IDC_PATH, m_Path); ";yCo0*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Io*`hA]  
 //}}AFX_DATA_MAP 4bqi&h3  
} Juj"cjob  
\Q<c Y<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7OX5"u!2  
//{{AFX_MSG_MAP(CCaptureDlg) PI(;t9]b  
 ON_WM_SYSCOMMAND() qz"di~7  
 ON_WM_PAINT() Enn7p9&  
 ON_WM_QUERYDRAGICON() IlJ6&9  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -?`^^ v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) = ;#?CAa:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6Y0k}+j|>E  
//}}AFX_MSG_MAP SuU,SE'TX  
END_MESSAGE_MAP() n=l>d#}$%T  
.ml24SeC  
BOOL CCaptureDlg::OnInitDialog() %N_5p'W  
{ DcA{E8Y  
 CDialog::OnInitDialog(); *,X;4?:,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ya3A^&:  
 ASSERT(IDM_ABOUTBOX < 0xF000); bmVksi2b  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ,\q9>cZ!  
 if (pSysMenu != NULL) 7{=/rbZT?  
 { FjqoO.  
  CString strAboutMenu; -jdS8n4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); HtB>#`'  
  if (!strAboutMenu.IsEmpty()) 0]=|3-n  
  {  -iWt~  
   pSysMenu->AppendMenu(MF_SEPARATOR); K>X#,lE-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ac}+U q  
  } Ecp]fUQK  
 } [ZU6z?Pf  
 SetIcon(m_hIcon, TRUE); // Set big icon ]3]I`e{  
 SetIcon(m_hIcon, FALSE); // Set small icon +<7~yZ[Z8  
 m_Key.SetCurSel(0);  u)PB@  
 RegisterHotkey(); #4iSQ$0  
 CMenu* pMenu=GetSystemMenu(FALSE); m`gH5vQa  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e/JbRbZX  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5xe} ljo  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \,)('tUE  
 return TRUE; // return TRUE unless you set the focus to a control L,c@Z@  
} =B@+[b0Z  
 P_6oMR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 42E]&=Cet  
{ F)_jW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) rpH ,c[D  
 { _SdO}AiG  
  CAboutDlg dlgAbout; ]:jP*0bLx  
  dlgAbout.DoModal(); ~``oKiPg@  
 } +U{8Mj  
 else ;"46H'>!  
 { RhR{EO  
  CDialog::OnSysCommand(nID, lParam);  PNY"Lqj  
 } V:HxRMF2X  
} @ -CZa^g  
l Os91+.%  
void CCaptureDlg::OnPaint() o0nd]"q?  
{ #&<>|m  
 if (IsIconic()) <y[LdB/a  
 { 4\ R2\  
  CPaintDC dc(this); // device context for painting z5`AJrj%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *Z'*^Y1le  
  // Center icon in client rectangle TtTp ,If  
  int cxIcon = GetSystemMetrics(SM_CXICON); =REMSe j  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4FUY1p  
  CRect rect; y"6;O0  
  GetClientRect(&rect); Z6C!-a  
  int x = (rect.Width() - cxIcon + 1) / 2; v&Xsyb0CaM  
  int y = (rect.Height() - cyIcon + 1) / 2; "=<T8M  
  // Draw the icon LG3D3{H(.  
  dc.DrawIcon(x, y, m_hIcon); C$?gt-tJ'  
 } L!G]i;=:  
 else `&y Qtj# '  
 { 3NU{7,F  
  CDialog::OnPaint(); # 4UKkd  
 } mU@pRjq=  
} k|V%*BvY>  
.kKU MyW(  
HCURSOR CCaptureDlg::OnQueryDragIcon() =hD@hQ i  
{ ZLm?8g6-  
 return (HCURSOR) m_hIcon; nk=+6r6  
} yu3: Hv}  
*|WS,  
void CCaptureDlg::OnCancel() \Gm$hTvB&  
{ D>tex/Of3  
 if(bTray) <% #Dwo}  
  DeleteIcon(); <&JK5$l<X  
  CDialog::OnCancel(); \cJ?2^Eq  
} Xc8r[dX  
Lv;% z  
void CCaptureDlg::OnAbout() xE>H:YPm  
{ Y$JGpeq8w  
 CAboutDlg dlg; b,C2(?hg  
 dlg.DoModal(); O_=2{k~s0  
} K9-;-{qb  
AzFd#P  
void CCaptureDlg::OnBrowse() u NmbR8Mx  
{ Ub[SUeBGH  
 CString str; !@>_5p>q*  
 BROWSEINFO bi; Vx'82CIC  
 char name[MAX_PATH]; :\hcl&W:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U-^qVlw  
 bi.hwndOwner=GetSafeHwnd();  vVvx g0  
 bi.pszDisplayName=name; P;~`%,+S  
 bi.lpszTitle="Select folder"; ?X $#J'U;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; l$[7 pM[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @QOlo -u  
 if(idl==NULL) 1f}YKT  
  return;  Y7*8 A,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  SXqWq  
 str.ReleaseBuffer(); FR*CiaD1  
 m_Path=str; BQWhTS7  
 if(str.GetAt(str.GetLength()-1)!='\\') yV"k:_O{  
  m_Path+="\\"; r_R( kns  
 UpdateData(FALSE); J!{"^^*  
} GgT 5'e;N  
b"4'*<=au  
void CCaptureDlg::SaveBmp() '%Fg+cZN\  
{ t+9[ki  
 CDC dc; K Eda6zZH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); I:|<};m m  
 CBitmap bm; Fw{:fFZC[  
 int Width=GetSystemMetrics(SM_CXSCREEN); S7!+8$2mc_  
 int Height=GetSystemMetrics(SM_CYSCREEN); /H (55^EMZ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); rgo#mTQ_  
 CDC tdc; $G\WW@*GE  
 tdc.CreateCompatibleDC(&dc); g2 RrBK,  
 CBitmap*pOld=tdc.SelectObject(&bm); z6'Cz}%EP'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1R-1#<a>&  
 tdc.SelectObject(pOld); IvZ,|R?  
 BITMAP btm; D;1?IeS  
 bm.GetBitmap(&btm); `GDWy^-Q+!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -G'U\EXT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nj1TX  
 BITMAPINFOHEADER bih; I8x,8}o>V  
 bih.biBitCount=btm.bmBitsPixel; wak:"B[  
 bih.biClrImportant=0; jm ORKX+)  
 bih.biClrUsed=0; WHF[l1  
 bih.biCompression=0; MiK -W  
 bih.biHeight=btm.bmHeight; k`we_$/Gw  
 bih.biPlanes=1; cMU"SO  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7y?aw`Sw:  
 bih.biSizeImage=size; |lDxk[  
 bih.biWidth=btm.bmWidth; b#%$y  
 bih.biXPelsPerMeter=0; CE5A^,EsB  
 bih.biYPelsPerMeter=0; &u`]Zn   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $.+_f,tU  
 static int filecount=0; kuq&8f~!  
 CString name; 42oW]b%P{;  
 name.Format("pict%04d.bmp",filecount++); B}(r>8?dm  
 name=m_Path+name; a Fh9B\n  
 BITMAPFILEHEADER bfh; !{1;wC(b  
 bfh.bfReserved1=bfh.bfReserved2=0; olv0w ;s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d6+$[4w  
 bfh.bfSize=54+size; 2RbK##`vC  
 bfh.bfOffBits=54; *SK`&V  
 CFile bf; $,.XPK5Q u  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1fH2obI~X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8@ZZ[9kt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?W 6 :$  
  bf.WriteHuge(lpData,size); Qx")D?u  
  bf.Close(); @?2ES@G+Ji  
  nCount++; )FdS;]  
 } )Fsc0_  
 GlobalFreePtr(lpData); ,*kh{lJ  
 if(nCount==1) tE8aL{<R  
  m_Number.Format("%d picture captured.",nCount); ]5O]=^ u0  
 else Zxw cqN  
  m_Number.Format("%d pictures captured.",nCount); @=ro/.  
  UpdateData(FALSE); eF"k"Ckt'  
} Yi?v |H<a  
,+4*\yI3l  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Yycfb  
{ a.z)m} +  
 if(pMsg -> message == WM_KEYDOWN) |1pD n7  
 { Cut7  
  if(pMsg -> wParam == VK_ESCAPE) \1He9~6  
   return TRUE; Y'^+ KU  
  if(pMsg -> wParam == VK_RETURN) <dGph  
   return TRUE; OWys`2W  
 } p:NIRs  
 return CDialog::PreTranslateMessage(pMsg); |yinVfZ0C  
} )61X,z  
/ q| o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *B)J(^M!q  
{ <y=+Gh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,p>@:C/M  
  SaveBmp(); 0z$::p$%u  
  return FALSE; hHk9O?  
} $KVCEe!X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ i7b^b>B|e  
 CMenu pop; :w<Ga8\tZ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r i/CLq^D  
 CMenu*pMenu=pop.GetSubMenu(0); dw>1Ut{"3  
 pMenu->SetDefaultItem(ID_EXITICON); z*)kK  
 CPoint pt; N(l  
 GetCursorPos(&pt); eakQZ-Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r3NdE~OAi  
 if(id==ID_EXITICON) l*w*e.ezQ  
  DeleteIcon(); hLr\;Swyp  
 else if(id==ID_EXIT) 4;2  
  OnCancel(); !%'"l{R  
 return FALSE; 6)veuA3]  
} /E-s g, k  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &0`i(l4]l  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3UX6Y]E3  
 AddIcon(); FN/siw(?3  
 return res; hCb2<_3CR  
}  r4M;]  
I8/tD|3  
void CCaptureDlg::AddIcon() c2u*<x  
{ {G+iobQdd  
 NOTIFYICONDATA data; 9S|a!9J  
 data.cbSize=sizeof(NOTIFYICONDATA); []$L"?]0uk  
 CString tip; VfFbZds8f  
 tip.LoadString(IDS_ICONTIP); $H`{wJ?2(  
 data.hIcon=GetIcon(0); v~A*?WU;n  
 data.hWnd=GetSafeHwnd(); sDB,+1"Y$  
 strcpy(data.szTip,tip); UP7?9\  
 data.uCallbackMessage=IDM_SHELL; |=:<[FU  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9&bJ]  
 data.uID=98; C~IE_E&Q`  
 Shell_NotifyIcon(NIM_ADD,&data); f@ILC=c<  
 ShowWindow(SW_HIDE); ,u=+%6b)A  
 bTray=TRUE; zHKx,]9b  
} 7]_zWx,r  
"r~/E|Da<  
void CCaptureDlg::DeleteIcon() :O7n*lwx  
{ je`Inn<  
 NOTIFYICONDATA data; Ro_jfM  
 data.cbSize=sizeof(NOTIFYICONDATA); \hWac%#  
 data.hWnd=GetSafeHwnd(); -zzoz x]S=  
 data.uID=98; dJe 3DW :  
 Shell_NotifyIcon(NIM_DELETE,&data); _SnD)k+TgJ  
 ShowWindow(SW_SHOW); 2;K2|G7  
 SetForegroundWindow(); &O5O@3:7]  
 ShowWindow(SW_SHOWNORMAL); J |w%n5Y  
 bTray=FALSE; 8O_yZ ~Z4  
} DKF` xuJP  
[$c"}=g[+  
void CCaptureDlg::OnChange() M0T z('~s  
{ h'+F'1=  
 RegisterHotkey(); 8#w%qij  
} '6cXCO-_P  
";;!c.!^  
BOOL CCaptureDlg::RegisterHotkey() of {K{(M7@  
{ "A> _U<Y  
 UpdateData(); \ B'AXv 6  
 UCHAR mask=0; S0tkqA4  
 UCHAR key=0; 0g;)je2_2?  
 if(m_bControl) Z]w?RL  
  mask|=4; |\>Ifv%{  
 if(m_bAlt) 1ASoH,D/  
  mask|=2; ?AH B\S  
 if(m_bShift) l.P;85/+  
  mask|=1; 91-[[<  
  key=Key_Table[m_Key.GetCurSel()]; tAPf#7{|   
 if(bRegistered){ .Q^V,[on1T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fRT4>So   
  bRegistered=FALSE; +`iJ+  
 } ((&5F!+\-  
 cMask=mask; os7xwI;T  
 cKey=key; hV+=hX<h  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^]D+H9Tl  
 return bRegistered; Sx8C<S5r<  
} MxH |yo[  
"lrQC`?  
  四、小结 ^ FM  
7?D?s!%\  
  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