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
  • 6266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: ifA)Ppt<`  
  *gq~~(jH  
  一、实现方法 baD`k?](  
l(o#N'!j4  
  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: 7 )2Co[t  
_I"T(2Au  
#pragma data_seg("shareddata") <6 LpsM}  
HHOOK hHook =NULL; //钩子句柄 XIgGE)n  
UINT nHookCount =0; //挂接的程序数目 0Y%u[i/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 r34q9NFT5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )2Ru} -H  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N^)\+*tf1  
static int KeyCount =0; pyW&`(]S  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 BrWo/1b  
#pragma data_seg() XM9}ax  
W[+=_B  
  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。 X ^ ?M4  
#- l1(m  
  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: =B0#z]qu  
b3>`%?A  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5uVSbo.  
cKey,UCHAR cMask) pj~Ao+  
{ E{Tvjh+  
 BOOL bAdded=FALSE; TVkC pO,H  
 for(int index=0;index<MAX_KEY;index++){ F%Xj'=  
  if(hCallWnd[index]==0){ 8lI'[Y?3.  
   hCallWnd[index]=hWnd; &<oZl.T  
   HotKey[index]=cKey; )A@i2I  
   HotKeyMask[index]=cMask; /nbHin#we  
   bAdded=TRUE; 0R#T3K}  
   KeyCount++; sX8?U,u  
   break; TQor-Cymz  
  } @@?P\jv~  
 } I6q]bQ="  
 return bAdded; 5._=m"Pl  
} P5qY|_  
//删除热键 T6P9Icv?@7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) */T.]^  
{ ?3I93Bt7  
 BOOL bRemoved=FALSE; 8 2EH'C  
 for(int index=0;index<MAX_KEY;index++){ l]bCt b%_  
  if(hCallWnd[index]==hWnd){ shn{]Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @TvoCDeI  
    hCallWnd[index]=NULL; 8 [z<gxP`?  
    HotKey[index]=0; K}r@O"6*\  
    HotKeyMask[index]=0; |i}5vT78  
    bRemoved=TRUE; _ ?\4k{ET  
    KeyCount--; O%>FKU>(?  
    break; rA">< pH  
   } P B W.nm  
  } B9Ha6kj  
 } *c 0\<BI  
 return bRemoved; i uNBw]  
} tn"n~;Bh?:  
Hq>"rrVhx  
T|/B}srm  
  DLL中的钩子函数如下: }Q=@$YIesD  
0Rme}&$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uoryxKRjc~  
{ K|OowM4tv  
 BOOL bProcessed=FALSE; ]]InD N  
 if(HC_ACTION==nCode) 7AOjlC9R}  
 { 2I!L+j_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "!fvEE  
   switch(wParam) Qd{h3K^hlu  
   {  TB8a#bK4  
    case VK_MENU: &3o[^_Ti  
     MaskBits&=~ALTBIT; kW 7 $  
     break; ';CL;A;  
    case VK_CONTROL: ? >\JX  
     MaskBits&=~CTRLBIT; A3!xYG=+  
     break; :epjJ1mW  
    case VK_SHIFT: 9rCvnP=  
     MaskBits&=~SHIFTBIT; jP{W|9@ (  
     break; @S-p[u  
    default: //judge the key and send message cP]5Qz   
     break; SU {U+  
   } t$*V*gK{  
   for(int index=0;index<MAX_KEY;index++){ hPM:=@ N$  
    if(hCallWnd[index]==NULL) ff1Em.  
     continue; )(aj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zl:Z31  
    { }gfs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~@v<B I  
     bProcessed=TRUE; ?)60JWOJ1  
    } #wvmVB.5~  
   } :'t+*{ff  
  } t!u{sr{j=  
  else if((lParam&0xc000ffff)==1){ //有键按下 nJ ZQRRa:C  
   switch(wParam) ? eU=xO  
   { gmU0/z3&  
    case VK_MENU: Gp PlO]  
     MaskBits|=ALTBIT; ]h`<E~  
     break; k *#fN(_  
    case VK_CONTROL: Hy_}e"  
     MaskBits|=CTRLBIT; 2".^Ma^D!  
     break; clcj5=:  
    case VK_SHIFT: 4)IRm2G  
     MaskBits|=SHIFTBIT; %"1*,g{  
     break; QIcg4\d%s  
    default: //judge the key and send message 9T#JlV  
     break; EE^ N01<"\  
   } cSkJlhwNn  
   for(int index=0;index<MAX_KEY;index++){ }'FNGn.~#  
    if(hCallWnd[index]==NULL) C8J3^ ?7E  
     continue; >`@c9 m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tR;? o,T  
    { s*XwU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); itp$c|{  
     bProcessed=TRUE; :Hn*|+'  
    } ^LO`6,   
   } \k8|3Y~g  
  } 9qqzCMrI0e  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 d- wbZ)BR  
   for(int index=0;index<MAX_KEY;index++){ &>0ape  
    if(hCallWnd[index]==NULL) +mr\AAFn  
     continue; @`hnp:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @ZD/y %e  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T9c=As_EM  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n1Y3b~E?E  
   } UT^-!L LB]  
  } w^.^XK4v.  
 } dV5aIj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S!u`V3-s  
} Ky qFeR  
!JkH$~  
  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: X+: >&&9  
`D#3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <K#]1xCA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [q MFLY$  
v7L} I[f  
  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: K~?M?sa  
Tt0:rQ.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) => PBdW  
{ * MJl(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @k~_ w#  
 { frYPC Irj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6]#\|lds1  
  SaveBmp(); E8:4Z$|c  
  return FALSE; $p} /&  
 } E2PMcT{)_  
 …… //其它处理及默认处理 >-~2:d\M3  
} )ny,vcU]  
_>/T<Db  
T%Vg0Y)P;  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 D-/aS5wM  
Cw=wU/)  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 'pUJlPGx  
lu GEBPi  
  二、编程步骤 owA0I'|V-A  
a-`OE"  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; %Ps DS  
]Tje6i F  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Se o3a6o  
i>Cxi ZT  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ")q{>tV  
~/@5&ajz  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; "! yKX(aTX  
 9"@P.8_  
  5、 添加代码,编译运行程序。 yqg&dq  
/f_c?|  
三、程序代码 J.`z;0]op  
KAR XC,z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~dIb>[7wy  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :Rs% (Z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iwHy!Vi-5  
#if _MSC_VER > 1000 /12D >OK  
#pragma once ;x[F4d  
#endif // _MSC_VER > 1000 ,RkL|'1l  
#ifndef __AFXWIN_H__ x04JU$@  
#error include 'stdafx.h' before including this file for PCH L"i B'=  
#endif nP9@yI*7  
#include "resource.h" // main symbols ~YIGOL"?  
class CHookApp : public CWinApp oCLs"L-r{  
{ %j].' ;  
 public: 2p(M`@  
  CHookApp(); '~-Lxvf'  
  // Overrides !;SpQ28  
  // ClassWizard generated virtual function overrides WC!bB  
  //{{AFX_VIRTUAL(CHookApp) *&j)"hX  
 public: kRs24 =  
  virtual BOOL InitInstance(); zS Yh ?NB5  
  virtual int ExitInstance(); LhZWK^!{S  
  //}}AFX_VIRTUAL /H)K_H#|;  
  //{{AFX_MSG(CHookApp) o W)M&$oS  
  // NOTE - the ClassWizard will add and remove member functions here. n'/w(o$&  
  // DO NOT EDIT what you see in these blocks of generated code ! :x*8*@kC  
  //}}AFX_MSG Co2* -[R  
  DECLARE_MESSAGE_MAP() Yx_[vLm  
}; AgsMk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )Oq N\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {cF7h)j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \?,'i/c-  
BOOL InitHotkey(); _tfZg /+)  
BOOL UnInit(); Fj9/@pe1  
#endif @<]xbWhuw  
XpzdvR1  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. w;.'>ORC  
#include "stdafx.h" ZQvpkO7}M  
#include "hook.h" mMqT-jT  
#include <windowsx.h> $+IE`(Ckf  
#ifdef _DEBUG z8 bDBoD6  
#define new DEBUG_NEW q+{-p?;;  
#undef THIS_FILE U[zY0B  
static char THIS_FILE[] = __FILE__; \lKiUy/  
#endif ?Z@FxW  
#define MAX_KEY 100 XA~Rn>7&H  
#define CTRLBIT 0x04 oZ1#.o{  
#define ALTBIT 0x02 ;lST@>  
#define SHIFTBIT 0x01 z_#B 4  
#pragma data_seg("shareddata") d"nz/$  
HHOOK hHook =NULL; NyD[9R?  
UINT nHookCount =0; lz!F{mR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s-eC')w~E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0s = h*"[  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey iTU 8WWY<  
static int KeyCount =0; Xj^6ZJc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G7k0P-r,0  
#pragma data_seg() UA[2R1}d  
HINSTANCE hins; ,\;;1Kq  
void VerifyWindow(); 'Y+AU#1~H  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?lv{;4BC  
//{{AFX_MSG_MAP(CHookApp) zCD?5*7  
// NOTE - the ClassWizard will add and remove mapping macros here. 07"dU  
// DO NOT EDIT what you see in these blocks of generated code! \5^#5_<  
//}}AFX_MSG_MAP lKs*KwG  
END_MESSAGE_MAP() v]g/ 5qI&  
e-4XNL[F  
CHookApp::CHookApp() ~R.8r-kD`  
{ B&0^3iKFi  
 // TODO: add construction code here, m?-3j65z  
 // Place all significant initialization in InitInstance 05:`(vl  
} &0Zn21q  
UYH;15s  
CHookApp theApp; ]RmQ*F-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -6MgC9]  
{ 4-[L^1%S[  
 BOOL bProcessed=FALSE; 8WU UE=p  
 if(HC_ACTION==nCode) @EzSosmF  
 { )t{oyBT  
  if((lParam&0xc0000000)==0xc0000000){// Key up chsjY]b  
   switch(wParam) P}o:WI4.cB  
   { euM7> $`  
    case VK_MENU: $]4^ENkI  
     MaskBits&=~ALTBIT; ll {jE  
     break; e#K =SV!H  
    case VK_CONTROL: H,qIHQW#  
     MaskBits&=~CTRLBIT; p5^,3&  
     break; h&J6  
    case VK_SHIFT: ^_JD 7-g  
     MaskBits&=~SHIFTBIT; ;Jt*s  
     break; ]{V q;  
    default: //judge the key and send message ~oI7TP  
     break; [JFmhLP9  
   } `pF|bZ?v  
   for(int index=0;index<MAX_KEY;index++){ \pZ,gF;y  
    if(hCallWnd[index]==NULL) z 8M^TV  
     continue; \4I1wdd|^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9iWDEk  
    { $j^Jj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); goi.'8M|/b  
     bProcessed=TRUE; <CJua1l\  
    } gF1q Z=<  
   } vpx8GiV  
  } `h12  
  else if((lParam&0xc000ffff)==1){ //Key down {zBf*x  
   switch(wParam) r00waw>C\  
   { C$\|eC j  
    case VK_MENU: <OF7:f  
     MaskBits|=ALTBIT; jcQ{,9 H`l  
     break; l2>G +t(,  
    case VK_CONTROL: ^8aj\xe(  
     MaskBits|=CTRLBIT; _{&znXf>?6  
     break; _n_lO8mK  
    case VK_SHIFT: -;'8#"{`^  
     MaskBits|=SHIFTBIT; QJp _>K  
     break; .pQH>;k]K  
    default: //judge the key and send message ?:Y{c#w>  
     break; JpE4 o2  
   } zJ7vAL  
   for(int index=0;index<MAX_KEY;index++) zcD&xoL\H  
   { 9H ?er_6Yf  
    if(hCallWnd[index]==NULL) bT}P":*y  
     continue; CQ2{5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EtJyI&7VK  
    { z71.5n!C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `?{QCBVj  
     bProcessed=TRUE; D61CO-E(D  
    } y%k\=:m  
   } $6h:j#{JE  
  } =C 8 t5BZ"  
  if(!bProcessed){ U?JZ23>bbw  
   for(int index=0;index<MAX_KEY;index++){ >- ]tOH,0  
    if(hCallWnd[index]==NULL) ,Cj1S7GFR  
     continue; /K2VSj3\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tYiK#N7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w"$CV@AJ  
   } MhNzmI&`  
  } %5RY Ea  
 } U .hV1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mJRvC%  
} <Bb $d@c  
y.2_5&e/  
BOOL InitHotkey() +:?-Xd:p  
{ DCM ,|FE  
 if(hHook!=NULL){ @Z~lM5n$8  
  nHookCount++; BKfcK>%g  
  return TRUE; ?1i>b->  
 } n;Tpf<*U  
 else x)l}d3   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s;X"E =  
  if(hHook!=NULL) !!4_x  
   nHookCount++; x;S v&  
  return (hHook!=NULL); bgGd  
} jI(~\`  
BOOL UnInit() r9 'lFj  
{ (%"M% Qko  
 if(nHookCount>1){ P0S ;aE  
  nHookCount--; rA&|!1q"B  
  return TRUE; mf6?8!O}>  
 }  y$7Fq'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); z+FhWze  
 if(unhooked==TRUE){ /E$"\md  
  nHookCount=0; 7g_:Gv~v  
  hHook=NULL; ?JDZDPVJ)  
 } X{\>TOk   
 return unhooked; OEy'8O$  
} lBh|+K N  
vC[)/w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S9}P 5;u  
{ g4!zH};n  
 BOOL bAdded=FALSE; \ }>1$kH;  
 for(int index=0;index<MAX_KEY;index++){ XWZ *{/u  
  if(hCallWnd[index]==0){ ^;n,C+  
   hCallWnd[index]=hWnd; bEP-I5j1t  
   HotKey[index]=cKey; ?dlQE,hB$  
   HotKeyMask[index]=cMask; KB <n-'  
   bAdded=TRUE; Teu4;  
   KeyCount++; qyGVyi3  
   break; pL8+gL  
  } YuSe~~F)j  
 } w' K\}G~  
 return bAdded; 1uz9zhG><  
} Kc_QxON4  
YOwo\'|=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :M9'wg  
{ n^'ip{  
 BOOL bRemoved=FALSE; .5|AX6p+^  
 for(int index=0;index<MAX_KEY;index++){ t Krr5SRb  
  if(hCallWnd[index]==hWnd){ #qT97NQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]H0BUg  
    hCallWnd[index]=NULL; o Q I3Yz  
    HotKey[index]=0; B5*{85p(u  
    HotKeyMask[index]=0; +u' ?VBv  
    bRemoved=TRUE; U0t/(Jyg  
    KeyCount--; OJ\IdUZ   
    break; B2:6=8<  
   } 1U.se` L  
  } YW9 [^  
 } x+l.04a@  
 return bRemoved; ~b/lr  
} @|(mR-Jj  
Y*;Z(W.V#  
void VerifyWindow() >t7xa]G  
{ \NKf$"x}  
 for(int i=0;i<MAX_KEY;i++){ 'x{g P?.  
  if(hCallWnd!=NULL){ <iunDL0  
   if(!IsWindow(hCallWnd)){ i%+cPQ^o  
    hCallWnd=NULL; 9V`/zq?  
    HotKey=0; SLpB$puS  
    HotKeyMask=0; $r*7)/  
    KeyCount--; LOpn PH`  
   } qEPvV  
  } yjvzA|(YC  
 } A#M#JI-Y  
} p#hs8xz  
DxR__  
BOOL CHookApp::InitInstance() &!]$#  
{ ^qs=fF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )a.Y$![  
 hins=AfxGetInstanceHandle(); E ;65kZ  
 InitHotkey(); y[Zl,v7  
 return CWinApp::InitInstance(); S-WD?BF C  
} 7S LJLn3d  
Ac'[(  
int CHookApp::ExitInstance() f305yo  
{ &1YqPk  
 VerifyWindow(); PN[ `p1F  
 UnInit(); 1%Xwk2l,8b  
 return CWinApp::ExitInstance(); U:m[* }+<  
} fs+l  
(xpj?zlmM  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =`[08  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =Ig'Aw$x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^5j|   
#if _MSC_VER > 1000 mv|eEz)r  
#pragma once W!8g.r4u+,  
#endif // _MSC_VER > 1000 V$%%nG uE  
Pj>r(Cv  
class CCaptureDlg : public CDialog _ fha9`  
{ B~QX{  
 // Construction EQ'iyXhEe  
 public: .^j #gE&B  
  BOOL bTray; >Lp^QP1gU  
  BOOL bRegistered; 2ikY.Xi6  
  BOOL RegisterHotkey(); 0{#,'sc;  
  UCHAR cKey; #Mw|h^ Wm  
  UCHAR cMask; xr+K: bw  
  void DeleteIcon(); |E-/b6G  
  void AddIcon(); } NW^?37  
  UINT nCount; NH$%g\GPs  
  void SaveBmp(); <h:>:%#k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _+YCwg  
  // Dialog Data 6Ae<W7  
  //{{AFX_DATA(CCaptureDlg) n#t{3qzpD  
  enum { IDD = IDD_CAPTURE_DIALOG }; .ii9-+_  
  CComboBox m_Key; l_GvdD  
  BOOL m_bControl; By(:%=.  
  BOOL m_bAlt; a5ZU"6Hi  
  BOOL m_bShift; { 2G9>'  
  CString m_Path; Yh)yp?  
  CString m_Number; S/G6NBnbS  
  //}}AFX_DATA 4zs1BiMG  
  // ClassWizard generated virtual function overrides ,}2yxo;i  
  //{{AFX_VIRTUAL(CCaptureDlg) RQ}(}|1+\  
 public: %7%7 W*0d  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  {I+   
 protected: 6I GUp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support / 1 lIV_Z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); s `fIeP  
  //}}AFX_VIRTUAL |@? B%sY  
  // Implementation a3e<< <Z>R  
 protected: |6w.m<p  
  HICON m_hIcon; c9imfA+e  
  // Generated message map functions ~L(=-B`Ow  
  //{{AFX_MSG(CCaptureDlg) 0yr=$F(]s  
  virtual BOOL OnInitDialog(); .}>d[},F  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,g2|8>sJP  
  afx_msg void OnPaint(); Z3?,r[   
  afx_msg HCURSOR OnQueryDragIcon(); V{@ xhW0  
  virtual void OnCancel(); Z_Jprp{3h  
  afx_msg void OnAbout(); :=vB|Ch:~  
  afx_msg void OnBrowse(); HSGM&!5mW  
  afx_msg void OnChange(); c=]qUhnH  
 //}}AFX_MSG l0AgW_T  
 DECLARE_MESSAGE_MAP() Ry>c]\a]  
}; @r4ZN6Wn  
#endif =<w6yeko  
d!kiWmw,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6, \i0y5n  
#include "stdafx.h" JR{3n*  
#include "Capture.h" <ABN/nH  
#include "CaptureDlg.h" RB<LZHZI  
#include <windowsx.h> | n5F_RL  
#pragma comment(lib,"hook.lib") @Aa$k:_  
#ifdef _DEBUG !]1X0wo\  
#define new DEBUG_NEW k_%2Ok   
#undef THIS_FILE #R$d6N[H  
static char THIS_FILE[] = __FILE__; |d^r"wbs3  
#endif +;~JHx.~X  
#define IDM_SHELL WM_USER+1 _h>S7-X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rr ! PU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ofbNg_K>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @/h_v#W  
class CAboutDlg : public CDialog S6-)N(3|  
{ @k:f(c  
 public: 9z7^0Ruw  
  CAboutDlg(); P\ \4 w)C  
  // Dialog Data 2`>/y  
  //{{AFX_DATA(CAboutDlg) TY~8`+bJ  
  enum { IDD = IDD_ABOUTBOX }; N1$lG? )+  
  //}}AFX_DATA V_f}Y8>e  
  // ClassWizard generated virtual function overrides #PUvrA2Zl  
  //{{AFX_VIRTUAL(CAboutDlg) Uf )?sz  
 protected: dA >=#/"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9n{tbabJ  
  //}}AFX_VIRTUAL hZ2!UW4'  
  // Implementation F{}mlQg  
 protected: iTsmUq<b]l  
  //{{AFX_MSG(CAboutDlg) >B(%$jG Z  
  //}}AFX_MSG !GI*R2<W  
  DECLARE_MESSAGE_MAP() cmgI,n-o?  
}; ?:l3O_U 5  
,9<}V;(  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2%4dA$H#4w  
{ _[;>V*?zp5  
 //{{AFX_DATA_INIT(CAboutDlg) <>$`vuU  
 //}}AFX_DATA_INIT ^2E\{$J  
} fkE4 [X7f  
p\I,P2on  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jn vJ`7zFP  
{ :e>y= s>  
 CDialog::DoDataExchange(pDX); *(6vO{  
 //{{AFX_DATA_MAP(CAboutDlg) wY|&qX,  
 //}}AFX_DATA_MAP H_)\:gTG  
} m[ *)sm  
 jL8[;*^G  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )W9W8>Cc5_  
 //{{AFX_MSG_MAP(CAboutDlg) @Ee{ GH^-  
 // No message handlers H59}d oKH  
 //}}AFX_MSG_MAP @igGfYy  
END_MESSAGE_MAP() \Z9+U:n  
O{Bll;C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;okFm  
: CDialog(CCaptureDlg::IDD, pParent) ({ 'I;]AQ  
{ {3=M-U~r  
 //{{AFX_DATA_INIT(CCaptureDlg) am.}2 QZU  
  m_bControl = FALSE; #4S">u  
  m_bAlt = FALSE; z%cq%P8g  
  m_bShift = FALSE; T0BFit6  
  m_Path = _T("c:\\"); [kwVxaI  
  m_Number = _T("0 picture captured."); ,!+>/RlJ  
  nCount=0; -w nlJi1f  
  bRegistered=FALSE; <#AS[Q[N  
  bTray=FALSE; %^){Z,}M}  
 //}}AFX_DATA_INIT P0O5CaR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )X-b|D4O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g4USKJ19.  
} -oc@$*t  
U-/-aNJ]U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @+II@[ _lT  
{ |9>?{ B\a  
 CDialog::DoDataExchange(pDX); _kUf[&  
 //{{AFX_DATA_MAP(CCaptureDlg) z5G<h  
  DDX_Control(pDX, IDC_KEY, m_Key); <)n8lIK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); # \9sCnb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #T<<{ RA  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); EIZSV>  
  DDX_Text(pDX, IDC_PATH, m_Path); sLiKcR8^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ',GWH:B  
 //}}AFX_DATA_MAP :SFcnYv0  
} UjLZ!-}  
RbB y8ZVM  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Zp'c>ty=  
//{{AFX_MSG_MAP(CCaptureDlg) ;M{@|z[Nv  
 ON_WM_SYSCOMMAND() j2O?]M  
 ON_WM_PAINT() 9x;CJhX  
 ON_WM_QUERYDRAGICON() !Ra.DSL  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) EfA*w/y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dx['7l;I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) R'R LF =  
//}}AFX_MSG_MAP Hq9yu*!u  
END_MESSAGE_MAP() ;xF5P'T?|  
~=HrD?-99p  
BOOL CCaptureDlg::OnInitDialog() 4+&4  
{ Q/[|/uNw?  
 CDialog::OnInitDialog(); <P&~k\BuF{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H9nVtS{x  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^8dd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !Ld0c4  
 if (pSysMenu != NULL) JU^ {!u  
 { Vk%[N>  
  CString strAboutMenu; L ;5R*)t  
  strAboutMenu.LoadString(IDS_ABOUTBOX); q{D_p[q  
  if (!strAboutMenu.IsEmpty()) b0W~*s [4  
  { `I*W}5  
   pSysMenu->AppendMenu(MF_SEPARATOR); /)I:C z/f  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); CZ2&9Vb9I  
  } S!!i  
 } /H 3u^  
 SetIcon(m_hIcon, TRUE); // Set big icon |eS5~0<`  
 SetIcon(m_hIcon, FALSE); // Set small icon p H&Tb4  
 m_Key.SetCurSel(0); W vh3Y,|3  
 RegisterHotkey(); Q1tZ]Q.6  
 CMenu* pMenu=GetSystemMenu(FALSE); ?VC[%sjwn  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5 :O7cBr  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m$nT#@l5bH  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); C1=7.dPr  
 return TRUE; // return TRUE unless you set the focus to a control ^R\et.W`s  
} !OwRx5  
:4 9ttJl  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R.n:W;^`  
{ _@U?;73"5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]Tmx;[D  
 { jSMvZJX3n  
  CAboutDlg dlgAbout; *n9t~t6GHg  
  dlgAbout.DoModal(); J:6wFmU  
 } {}F?eI  
 else j ys1Ki  
 { {&tbp Bl#  
  CDialog::OnSysCommand(nID, lParam); U)IW6)q  
 } R7~H}>uaF  
} L,!3  
cEkf9:_La  
void CCaptureDlg::OnPaint() fq^D<c{3  
{ 7A7=~:l\G  
 if (IsIconic()) *}BaO*A  
 { z}I4m  
  CPaintDC dc(this); // device context for painting $nR1AOm}.B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =4RXNWkud  
  // Center icon in client rectangle V6)e Jy  
  int cxIcon = GetSystemMetrics(SM_CXICON); qJq49}2  
  int cyIcon = GetSystemMetrics(SM_CYICON); z#qlu=  
  CRect rect; #vk-zx*v7=  
  GetClientRect(&rect); 1pe eecE  
  int x = (rect.Width() - cxIcon + 1) / 2; Pba 6Ay6B  
  int y = (rect.Height() - cyIcon + 1) / 2; wps`2`z  
  // Draw the icon c.5?Q >!+  
  dc.DrawIcon(x, y, m_hIcon); 6=V&3|"  
 } pJM~'tlHV  
 else U`gQ7  
 { W/*2I3a  
  CDialog::OnPaint(); b"U{@  
 } *E"QFirk0  
} 8K qrB!  
Z i-)PK^  
HCURSOR CCaptureDlg::OnQueryDragIcon() $JKR,   
{ Q;p?.GI?-  
 return (HCURSOR) m_hIcon; F,2)Udim  
} f.?p"~!  
#{973~uj  
void CCaptureDlg::OnCancel() Wj2s+L7,  
{ 21Z}Zj  
 if(bTray) Lf+M +^l  
  DeleteIcon(); <gU^#gsGra  
  CDialog::OnCancel(); plL##?<D<  
} rCGyr}(NC  
#]nH$Kq  
void CCaptureDlg::OnAbout() GX4HW \>a  
{ &A=>x  
 CAboutDlg dlg; %T:~N<8)  
 dlg.DoModal(); 6?-vj2,  
} Kyy CS>  
" S6'<~s  
void CCaptureDlg::OnBrowse() o!TG8aeb  
{ mjdZ^  
 CString str; CRy;>UI  
 BROWSEINFO bi; r+8%oWj  
 char name[MAX_PATH]; r5ONAa3.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /A3tY"Vn  
 bi.hwndOwner=GetSafeHwnd(); N*.JQvbnr  
 bi.pszDisplayName=name; zZ3Ko3L%g_  
 bi.lpszTitle="Select folder"; UEeD Nl$^u  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V:?exJg9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?+Sjt  
 if(idl==NULL) D[) Z$+D4f  
  return; c`]_Q1'30w  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {Lj]++`fB]  
 str.ReleaseBuffer(); f?O?2g  
 m_Path=str; ~m~<xtoc  
 if(str.GetAt(str.GetLength()-1)!='\\') Wi3:;`>G<p  
  m_Path+="\\"; jOs&E^">&B  
 UpdateData(FALSE); B%95M|  
} x:bJ1%  
o"F=3b~:n  
void CCaptureDlg::SaveBmp() 1`1U'ibhe  
{ H.sHXuu  
 CDC dc; JTuU}nm+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <uUHr,#  
 CBitmap bm; @di mZsi1  
 int Width=GetSystemMetrics(SM_CXSCREEN); . IBy'  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y#3<w  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E0XfM B]+  
 CDC tdc; b(8#*S!U  
 tdc.CreateCompatibleDC(&dc); \W5fcxf  
 CBitmap*pOld=tdc.SelectObject(&bm); .Y}~2n  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *g =ey?1S  
 tdc.SelectObject(pOld); 0pT?qsM2  
 BITMAP btm; $q`650&S*  
 bm.GetBitmap(&btm); rt+%&% wt  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \v(}@zcB|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gkDyWZG B  
 BITMAPINFOHEADER bih; \XaKq8uE  
 bih.biBitCount=btm.bmBitsPixel; Y<lJj"G  
 bih.biClrImportant=0; _U%a`%tU.  
 bih.biClrUsed=0; Bi7QYi/  
 bih.biCompression=0; '8+<^%c  
 bih.biHeight=btm.bmHeight; 1m$:Rn^  
 bih.biPlanes=1; 2l5>>yY  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0fhz7\a^_<  
 bih.biSizeImage=size; QkJAjmB  
 bih.biWidth=btm.bmWidth; fi*@m,-  
 bih.biXPelsPerMeter=0; nCF1i2*6|"  
 bih.biYPelsPerMeter=0; LadE4:oy  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); df}DJB  
 static int filecount=0; nH*JR  
 CString name; R"NR-iU  
 name.Format("pict%04d.bmp",filecount++); J[6`$$l0  
 name=m_Path+name; Ke0j8|  
 BITMAPFILEHEADER bfh; &rY73qfP'  
 bfh.bfReserved1=bfh.bfReserved2=0; 'C iV=&3/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); .W[ 9G\  
 bfh.bfSize=54+size; hV,)u3  
 bfh.bfOffBits=54; ~(Wq 5<v  
 CFile bf; /"w%?Ea  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CmyCne   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); d~NvS-u7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Ae,P&(  
  bf.WriteHuge(lpData,size); |KF_h^  
  bf.Close(); )erI3?k  
  nCount++; QMUmPx&  
 } 6\jhDP@`9  
 GlobalFreePtr(lpData); neN #Mo'A  
 if(nCount==1) V\U,PNkZQ  
  m_Number.Format("%d picture captured.",nCount); 7noxUGmFw  
 else wxy. &a]  
  m_Number.Format("%d pictures captured.",nCount); pY75S5h:  
  UpdateData(FALSE); Gt >*y.]  
} n#F:(MSOp  
E0 ~\ A;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _}4l4  
{ R5_xli%  
 if(pMsg -> message == WM_KEYDOWN) =ELl86=CG  
 { <Lz/J-w  
  if(pMsg -> wParam == VK_ESCAPE) fO6i  
   return TRUE; Pc"g  
  if(pMsg -> wParam == VK_RETURN) 8UY[$lc  
   return TRUE; |Nx7jGd:i  
 } Tf [o'=2  
 return CDialog::PreTranslateMessage(pMsg); #^|"dIZ_M  
} vumA W*  
#9Src\V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o Ho@rGU  
{ 9|y?jb5im  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pP JhF8Dt  
  SaveBmp(); h+,Eu7\88  
  return FALSE; %kB84dE  
} }@R*U0*E  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JL[xrK0  
 CMenu pop; WS17DsWW  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Y 6B7qp  
 CMenu*pMenu=pop.GetSubMenu(0); QU&LC  
 pMenu->SetDefaultItem(ID_EXITICON); >"}z % #  
 CPoint pt; i@Vi.oc4[  
 GetCursorPos(&pt); Qf HJZ7K.4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >x /;'Y.  
 if(id==ID_EXITICON) s/' ]* n  
  DeleteIcon(); v[P $c$Xi  
 else if(id==ID_EXIT) puE!7 :X7  
  OnCancel(); {,kA'Px)  
 return FALSE; nQy%av$  
} )SJ18 no|l  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ft} h&aYP  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ?4G/f<ou  
 AddIcon(); h!>K[*  
 return res; /EW1&  
} ~57.0?IK  
(P=q&]l[  
void CCaptureDlg::AddIcon() 'WF Ey>1#  
{ &\w:jI44Bs  
 NOTIFYICONDATA data; J 'qhY'te  
 data.cbSize=sizeof(NOTIFYICONDATA); %yr(i 6L  
 CString tip; 3b9SyU2  
 tip.LoadString(IDS_ICONTIP); k;)t}7(  
 data.hIcon=GetIcon(0); PG@Uygahu  
 data.hWnd=GetSafeHwnd(); \xtY\q,[  
 strcpy(data.szTip,tip); ;ty08D/  
 data.uCallbackMessage=IDM_SHELL; CAs8=N#H%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ONc-jU^  
 data.uID=98; Qv v~nGq$  
 Shell_NotifyIcon(NIM_ADD,&data); Aw7oyC!  
 ShowWindow(SW_HIDE); hXF#KVqx  
 bTray=TRUE; s,~p}A%0  
} 'f'zV@)  
Imv ]V6"D=  
void CCaptureDlg::DeleteIcon() J%|n^^ /un  
{ 1-!q,q  
 NOTIFYICONDATA data; p bRU"   
 data.cbSize=sizeof(NOTIFYICONDATA); |ORro r}  
 data.hWnd=GetSafeHwnd(); J ~"h&>T  
 data.uID=98; CVk.Ez6  
 Shell_NotifyIcon(NIM_DELETE,&data); q!r4"#Y"@Z  
 ShowWindow(SW_SHOW); L("zS%qr  
 SetForegroundWindow(); 8Qwn  
 ShowWindow(SW_SHOWNORMAL); #YEOY#  
 bTray=FALSE; uaiCyh1:  
} f&ZFG>)6  
.+.BNS   
void CCaptureDlg::OnChange() xD|/98  
{ =.<S3?  
 RegisterHotkey(); liU/O:Ap  
} IRq@~vdt)  
f>i" j  
BOOL CCaptureDlg::RegisterHotkey() ]&oQ6  
{ Pr>Pxsr&  
 UpdateData(); >I*Qc<X91  
 UCHAR mask=0; *{#l0My  
 UCHAR key=0; O /S:S  
 if(m_bControl) czp .q  
  mask|=4; rhr(uCp/  
 if(m_bAlt) v \xuq`  
  mask|=2; x!@3.$  
 if(m_bShift) B#Q=Fo 6  
  mask|=1; Lt<KRs  
  key=Key_Table[m_Key.GetCurSel()]; XFS"~{  
 if(bRegistered){ <E&[sQ|3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~WKcO&  
  bRegistered=FALSE; 94Hs.S)  
 } "{1SDbwmMo  
 cMask=mask; Ho_ 2zx:8b  
 cKey=key; m h5ozv$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +6i~Rx>  
 return bRegistered; ue/GB+U  
} $$GmundqB  
` 6'dhB  
  四、小结 0P%,1M3d  
|o5F%1o  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
10+5=?,请输入中文答案:十五