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
  • 6134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: C\*4q8(  
  MTOy8 Im  
  一、实现方法 \ck+GW4&  
qfoD  
  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: \tN-(=T  
!?!C'-ps  
#pragma data_seg("shareddata") t2BL( yB  
HHOOK hHook =NULL; //钩子句柄 D5,P)[  
UINT nHookCount =0; //挂接的程序数目 &--ej|n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &#yR;{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7msAhz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /Q{P3:k  
static int KeyCount =0; O1'm@ q)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 OEx^3z^  
#pragma data_seg() $*R/tJ.  
RsJ6OFcWV  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 \ZU1J b1c  
umi5Wb<  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: s?R2B)a  
u8GMUN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR kOo~%kcQ'  
cKey,UCHAR cMask) `;l.MZL!  
{ .iX# A<E}  
 BOOL bAdded=FALSE; ?>"Yr,b?  
 for(int index=0;index<MAX_KEY;index++){ #~O b)q|  
  if(hCallWnd[index]==0){ 0tg8~H3yy  
   hCallWnd[index]=hWnd; *3/T;x.  
   HotKey[index]=cKey; mZz="ZLa:  
   HotKeyMask[index]=cMask; M-V&X&?j  
   bAdded=TRUE; ^z6_Uw[  
   KeyCount++; O3DmNq$dz  
   break; /zDi9W*~1  
  } y\dEk:\)  
 } :+Om]#`Vls  
 return bAdded; n_ lo`  
} ^sN (  
//删除热键 $Iv2j">3)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #jA[9gWI  
{ . 8N.l^0,  
 BOOL bRemoved=FALSE; FIxFnh3~  
 for(int index=0;index<MAX_KEY;index++){ =0uAE7q(9  
  if(hCallWnd[index]==hWnd){ m<FOu<y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ] e. JNo  
    hCallWnd[index]=NULL; +)o}c"P!  
    HotKey[index]=0; EBz}|GY;  
    HotKeyMask[index]=0; $/!{OU.t`  
    bRemoved=TRUE; H"ZZ.^"5FV  
    KeyCount--; 5p.rwNE  
    break; r'QnX;99T  
   } q[`j`8YY!R  
  } fd-q3 _f  
 } J{^RkGF  
 return bRemoved; Uf}\p~;  
} p-.n3AL  
UfS%71l.$  
p+)YTzzc  
  DLL中的钩子函数如下: 3U_2!zF3_  
a7N!B'y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q.,JVGMS  
{ -B86U6^s  
 BOOL bProcessed=FALSE; M1KqY:9E  
 if(HC_ACTION==nCode) -D6exTxh"  
 { B&D}F=U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^Q+g({  
   switch(wParam) qucq,Yw  
   {  x c{hC4^V  
    case VK_MENU: x?&$ci  
     MaskBits&=~ALTBIT; ,}K<*t[I  
     break; [jmd  
    case VK_CONTROL: !.d@L6  
     MaskBits&=~CTRLBIT; 9k{PBAP  
     break; 2RSt)3!},  
    case VK_SHIFT: ;G%R<Z  
     MaskBits&=~SHIFTBIT; yn#X;ja-  
     break; l ok=  
    default: //judge the key and send message \L"kV!>  
     break; )ZN|t?|  
   } u*hSj)vr1  
   for(int index=0;index<MAX_KEY;index++){ Z?\>JM >;  
    if(hCallWnd[index]==NULL) B ~OZ2-~  
     continue; 720DV +o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R?]02Q  
    { `]%|f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i>(e}<i  
     bProcessed=TRUE; T?X_c"{8M  
    } s_mS^`P7  
   } AvW:<}a,  
  } 2k=# om19  
  else if((lParam&0xc000ffff)==1){ //有键按下 vh$%9ed  
   switch(wParam) )= =Jfn y  
   { ?!+MM&c-n  
    case VK_MENU: BqT y~{)+  
     MaskBits|=ALTBIT; R6(oZph  
     break; @ta7"6p-i@  
    case VK_CONTROL: S_Wrw z  
     MaskBits|=CTRLBIT; ^0 -:G6H  
     break; pej|!oX  
    case VK_SHIFT: _ jsK}- \  
     MaskBits|=SHIFTBIT; "yS _s  
     break; c I4K+  
    default: //judge the key and send message qw^uPs7Uw  
     break; `7r@a  
   } h 5^Z2:#  
   for(int index=0;index<MAX_KEY;index++){ r[*Vqcz  
    if(hCallWnd[index]==NULL) k=jk`c{<[  
     continue; Rd#WMo2Xd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $ 69oV:  
    { H*r)Z 90  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2I,^YWR  
     bProcessed=TRUE; C)`Fv=]R  
    } \hx1o\  
   } 6 |PrX L&  
  } )84~ugs  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 l`f/4vy  
   for(int index=0;index<MAX_KEY;index++){ N$U$5;r~`  
    if(hCallWnd[index]==NULL) md"!33 @  
     continue; q-}Fvel u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3v1iy / /  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UdpF@Q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <4HDZ{"M  
   } gMzcTmbc8  
  } zdYy^8V|z  
 } 3`t%g[D1  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  PoxK{Y  
} ^rifRY-,yO  
xe^Gs]fm  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: e4>_v('  
.K1FKC$C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,g2ij  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xLK<W"%0  
V3^&oe%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ,F,X ,  
m}7iTDJR9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hhCrUn"  
{ EK6:~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Bu#VMk chJ  
 { wAf\|{Vn  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qVH1}9_  
  SaveBmp(); .\)U@L~  
  return FALSE; &m-PC(W+  
 } [OC5l>  
 …… //其它处理及默认处理 E2R&[Q"%  
} 6ZP(E^.  
LG9+y  
l1BtI_7p  
  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。 1H6<[iHW  
 : y%d  
  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。 #h` V>;  
wl#@lOv-P  
  二、编程步骤 (|klSz_4LM  
>0ow7Uw;  
  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"; 8%A#`)fb  
'>-gi}z7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; m qMHL2~  
A%KDiIA  
  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; CDQW !XHc  
=8AO:  
  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; K,+LG7ec  
n"G&ENN"$  
  5、 添加代码,编译运行程序。 }`% *W`9b  
J&W)(Cf  
三、程序代码 3@dL /x4A  
v0z5j6)-1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7z JRJ*NB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }$SavB#SBP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ PgtJ3oq [}  
#if _MSC_VER > 1000 hT`J1nNt  
#pragma once 42G)~lun-d  
#endif // _MSC_VER > 1000 :XZU&Sr"  
#ifndef __AFXWIN_H__ [j=yMP38!:  
#error include 'stdafx.h' before including this file for PCH + B B@OW  
#endif s4A43i'g!h  
#include "resource.h" // main symbols *>7>g"  
class CHookApp : public CWinApp m% -g~q  
{ f$e[u E r  
 public: 7puFz4+f  
  CHookApp(); Dfg2`l  
  // Overrides X[]m _@v  
  // ClassWizard generated virtual function overrides We$:&K0  
  //{{AFX_VIRTUAL(CHookApp) v$7QIl_/7  
 public: Mm.<r-b  
  virtual BOOL InitInstance(); _aGOb;h  
  virtual int ExitInstance(); WA)yfo0A  
  //}}AFX_VIRTUAL l?Udn0F  
  //{{AFX_MSG(CHookApp) LlX{#R  
  // NOTE - the ClassWizard will add and remove member functions here. x$5) ^ud?  
  // DO NOT EDIT what you see in these blocks of generated code ! DFZkh^PFd  
  //}}AFX_MSG {XR6>]  
  DECLARE_MESSAGE_MAP() x+ Ttl4  
}; H?<N.Dq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C'\- @/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k1w_[w [  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6& e3Nt  
BOOL InitHotkey(); i2E )P x  
BOOL UnInit(); ehzM) uK  
#endif 60P#,o@G  
]R h#g5X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |=Eo?Q_  
#include "stdafx.h" qLn/2  
#include "hook.h" QdT}wkX  
#include <windowsx.h> z>58dA@f  
#ifdef _DEBUG N60rgSzI  
#define new DEBUG_NEW _4"mAPt  
#undef THIS_FILE }Lc-7[/  
static char THIS_FILE[] = __FILE__; nzd2zY>V  
#endif Wk~W Ozr}^  
#define MAX_KEY 100 0h#l JS*  
#define CTRLBIT 0x04 _ky,;9G]  
#define ALTBIT 0x02 5]KW^sL  
#define SHIFTBIT 0x01 |^:cG4e  
#pragma data_seg("shareddata") B~]k#Ot)  
HHOOK hHook =NULL; Aydm2!l1  
UINT nHookCount =0; xSktg]u Se  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7C,&*Ax,9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O@u?h9?cf>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]op}y0  
static int KeyCount =0; 7mI:| G  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift D^yRaP*|7  
#pragma data_seg() =5J7Hw&K  
HINSTANCE hins; e<3K;Q  
void VerifyWindow();  aC$B2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) aZ2!i  
//{{AFX_MSG_MAP(CHookApp) ]NUl9t*N4  
// NOTE - the ClassWizard will add and remove mapping macros here. /1"(cQ%?  
// DO NOT EDIT what you see in these blocks of generated code! {G U&a  
//}}AFX_MSG_MAP .>= (' -  
END_MESSAGE_MAP() <e Th  
7&t-pv92*  
CHookApp::CHookApp() <'qeXgi  
{ !nqUBa  
 // TODO: add construction code here, ykl .1(  
 // Place all significant initialization in InitInstance rSZd!OQ  
} 'FqQzx"r  
Huy5-[)15  
CHookApp theApp; k.5u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xQ}pu2@d  
{ 5:pM 4J  
 BOOL bProcessed=FALSE; QKyo`g7  
 if(HC_ACTION==nCode) 'qZW,],5  
 { 2)G %)'  
  if((lParam&0xc0000000)==0xc0000000){// Key up C"6?bg5N  
   switch(wParam) ^N7e76VwR  
   { XG}C+;4Aw  
    case VK_MENU: kStnb?nk  
     MaskBits&=~ALTBIT; %SX|o-B~.o  
     break; PH1p2Je  
    case VK_CONTROL: *!q1Kr6r  
     MaskBits&=~CTRLBIT; C`$n[kCJ  
     break; l n{e1':$"  
    case VK_SHIFT: 4]yOF_8h  
     MaskBits&=~SHIFTBIT; dYT%  
     break; YM1'L\^  
    default: //judge the key and send message p2ogn}`  
     break; K~AR*1??[  
   } '10oK {m$  
   for(int index=0;index<MAX_KEY;index++){ j}%ja_9S  
    if(hCallWnd[index]==NULL) W}m)cn3@  
     continue; CLRiJ*U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a6D &/8  
    { /35R u}c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4i6q{BeHn  
     bProcessed=TRUE; u$>4F|=T  
    } /RNIIY~w  
   } wfNk=)^$  
  } RX>xB  
  else if((lParam&0xc000ffff)==1){ //Key down dYG,_ji  
   switch(wParam) v'U{/ ,x  
   { + ,%&e  
    case VK_MENU: `);AW(Q  
     MaskBits|=ALTBIT; ]^Qn  
     break; 6hlc1?  
    case VK_CONTROL: >[9J?H  
     MaskBits|=CTRLBIT; ukIQr/k  
     break; o^^rJk  
    case VK_SHIFT: GR +[UG  
     MaskBits|=SHIFTBIT; z2MWN\?8  
     break; T V<'8 L  
    default: //judge the key and send message |bq$xp  
     break; v9:9E|,U+  
   } lhYe;b(  
   for(int index=0;index<MAX_KEY;index++) '9S8}q  
   { P#R R9>Q  
    if(hCallWnd[index]==NULL) ^Y@\1fX 4e  
     continue; SLkhCR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VRI0W`  
    { Jbjmv: db  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); **$LR<L  
     bProcessed=TRUE; 6%t1bM a  
    } W yB3ls~  
   } qu-B| MuOa  
  } PMN jn9d  
  if(!bProcessed){ )CuZDf@  
   for(int index=0;index<MAX_KEY;index++){ N):tOD@B  
    if(hCallWnd[index]==NULL)  Of"  
     continue; 4(|cG7>9-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +_; l|uhT;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JTr vnA  
   } SSPHhAeH8  
  } }])oM|fgO  
 } b\3Oyp>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); luo   
} ()5[x.xK@  
X;i~ <Tq  
BOOL InitHotkey() EH256f(&  
{ UmKI1l  
 if(hHook!=NULL){ eM$sv9?  
  nHookCount++; v3aYc:C  
  return TRUE; VKq=7^W  
 } x c/}#>ED  
 else M-1ngI0H;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fz\9 S  
  if(hHook!=NULL) t"= E^r  
   nHookCount++; 2nSSF x r  
  return (hHook!=NULL); >33=<~#n  
} |$vX<. S  
BOOL UnInit() {[+mpKq  
{ vhpNpgz  
 if(nHookCount>1){ ]L9s%]o  
  nHookCount--; VHCK2}ps  
  return TRUE; ~io szX  
 } 43mP]*=A  
 BOOL unhooked = UnhookWindowsHookEx(hHook); te3}d'9&|  
 if(unhooked==TRUE){ y9x w 9l'  
  nHookCount=0; `8AR_7i  
  hHook=NULL; hp#W 9@NR  
 } 8n'B6hi  
 return unhooked; :c8&N-`  
} E^vJ@O  
\#Pfj &*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .}OR  
{ _a6[{_Pc  
 BOOL bAdded=FALSE; ~yH?=:>U  
 for(int index=0;index<MAX_KEY;index++){ swM*k;$q{  
  if(hCallWnd[index]==0){ q(`/Vo4g(  
   hCallWnd[index]=hWnd; rEB @$C^  
   HotKey[index]=cKey; P(+&OoY2  
   HotKeyMask[index]=cMask; RloK,bg  
   bAdded=TRUE; Nv(9N-9r  
   KeyCount++; )n2 re?S  
   break; %Z):>'  
  } *=(lyx_O  
 } gDQ1?N'8{t  
 return bAdded; 9y<*8bI   
} 9~p[  
+y&Tf#.V/A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y%%}k  
{ bgK'{_o-  
 BOOL bRemoved=FALSE; 7R6ry(6N  
 for(int index=0;index<MAX_KEY;index++){ l)Crc-:}4j  
  if(hCallWnd[index]==hWnd){ .(^ ,z&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #vti+A~n,4  
    hCallWnd[index]=NULL; :_g$.h%%  
    HotKey[index]=0; 4lKq{X5<  
    HotKeyMask[index]=0; ?QFpv #4  
    bRemoved=TRUE; wVEm:/;z&  
    KeyCount--; AaWs}M  
    break; K i'Fn"  
   } 5@+,Xh,H|t  
  } ,N!o  
 } 2E}*v5b,  
 return bRemoved; P_*" dza  
} _V7r1fY:  
umt.Um.m2  
void VerifyWindow() YVHm{A1b0  
{ FB{KH .  
 for(int i=0;i<MAX_KEY;i++){ X]wRwG  
  if(hCallWnd!=NULL){ 3'cE\u  
   if(!IsWindow(hCallWnd)){ ]pH-2_  
    hCallWnd=NULL; %M7` Hwu  
    HotKey=0; k'Sp.  
    HotKeyMask=0; mP0yk|  
    KeyCount--; m^ tFi7c  
   } y:~ZLTAv  
  } ?~hHGf\^b6  
 } D-5VC9{  
} 1*9U1\z  
}]lr>"~y}  
BOOL CHookApp::InitInstance() L"o>wYx  
{ kXi6lh  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *>n;SuT_  
 hins=AfxGetInstanceHandle(); {>DE sO  
 InitHotkey(); qz0;p=$8Z  
 return CWinApp::InitInstance(); Y]/% t{Y  
} , udTvI  
}bdmomV  
int CHookApp::ExitInstance() W-?()dX{  
{ E5I"%9X0H  
 VerifyWindow(); 7 "20hAd  
 UnInit(); x{n`^;Y1  
 return CWinApp::ExitInstance(); 0K`#>}W#X  
} KKiE@_z  
BG6B :  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OY;*zk  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Gd-'Z_b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ mlJ!:WG  
#if _MSC_VER > 1000 5|o6v1bM  
#pragma once wr$M$i:  
#endif // _MSC_VER > 1000 j4jTSLQ\  
=g9*UzA"O  
class CCaptureDlg : public CDialog |=`~-i2W  
{ /aZ+T5O  
 // Construction VUPXO  
 public: 62 k^KO6Y  
  BOOL bTray; a yCY~=i  
  BOOL bRegistered; JtEo'As:[  
  BOOL RegisterHotkey(); 1IC~e^"  
  UCHAR cKey; 5ni~Q 9b  
  UCHAR cMask; mS(fgq6  
  void DeleteIcon(); UNom-  
  void AddIcon(); Ta(Y:*Ri  
  UINT nCount; [d(U38BI  
  void SaveBmp(); nbm&wa[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1FlX'[vh  
  // Dialog Data U+:m4a  
  //{{AFX_DATA(CCaptureDlg) _+K_5IO4  
  enum { IDD = IDD_CAPTURE_DIALOG }; }1Gv)l7  
  CComboBox m_Key; Cd,jDPrw  
  BOOL m_bControl; FbS|~Rp~  
  BOOL m_bAlt; gW>uR3Ca4  
  BOOL m_bShift;  gQ'zW  
  CString m_Path; oU056  
  CString m_Number; g!lWu[d  
  //}}AFX_DATA gl\\+VyU  
  // ClassWizard generated virtual function overrides N/ %WsQp  
  //{{AFX_VIRTUAL(CCaptureDlg) /178A;J y  
 public: 9 Vkb>yFX'  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Nl^;A> <u  
 protected: $ M`hh{ -  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M?Dfu .t  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); DI:]GED" =  
  //}}AFX_VIRTUAL NdMb)l)m  
  // Implementation nuk*.Su  
 protected: [fAV5U  
  HICON m_hIcon; GFeQ%l`7F  
  // Generated message map functions Qw-~>d  
  //{{AFX_MSG(CCaptureDlg) QEz? w}b*  
  virtual BOOL OnInitDialog(); dIN$)?aB0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {1 UQ/_  
  afx_msg void OnPaint(); iII=;:p  
  afx_msg HCURSOR OnQueryDragIcon(); -w9pwB  
  virtual void OnCancel(); }&cu/o4  
  afx_msg void OnAbout(); (gP)%  
  afx_msg void OnBrowse(); ^ DaBz\  
  afx_msg void OnChange(); ^hc!FD  
 //}}AFX_MSG OGK}EI  
 DECLARE_MESSAGE_MAP() ,]9P{k]O  
}; 9oYgl1}d  
#endif * @ 3Ag(  
K#6P}tf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &J[:awQX  
#include "stdafx.h" 63\/ * NNB  
#include "Capture.h" 7HIeJ  
#include "CaptureDlg.h" vB.E3r=  
#include <windowsx.h> ^2Fei.?T.  
#pragma comment(lib,"hook.lib") 2bJQTk_S  
#ifdef _DEBUG tSc Pa,(  
#define new DEBUG_NEW 0z1ifg&  
#undef THIS_FILE U' H$`$Ov  
static char THIS_FILE[] = __FILE__; U{2BVqM  
#endif t{xf:~B  
#define IDM_SHELL WM_USER+1 $xzAv{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #.rdQ,)<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b*a#<K$T_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dP3CG8w5  
class CAboutDlg : public CDialog Q# ~Q=T'<  
{ aI P  
 public: EMY/~bQW  
  CAboutDlg(); l4F%VR4KT  
  // Dialog Data 2BQ j  
  //{{AFX_DATA(CAboutDlg) Cn,d?H  
  enum { IDD = IDD_ABOUTBOX }; g;pcZ9o  
  //}}AFX_DATA ~xkeuU  
  // ClassWizard generated virtual function overrides )eUh=eW  
  //{{AFX_VIRTUAL(CAboutDlg) &XIt5<$~R  
 protected: [w0QZyUn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |XQIfW]A  
  //}}AFX_VIRTUAL O#ai)e_uQk  
  // Implementation @:+8?qcP  
 protected: KaPAa:Q  
  //{{AFX_MSG(CAboutDlg) :flx6,7D  
  //}}AFX_MSG @i 2E\}  
  DECLARE_MESSAGE_MAP() BF\XEm?!  
}; )(bW#-  
h;p>o75O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <c2E'U)X  
{ MI/MhkS ?  
 //{{AFX_DATA_INIT(CAboutDlg) 94h]~GqNi  
 //}}AFX_DATA_INIT &v56#lG  
} >")Tf6zw&  
z>LUH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /Lfm&;  
{ kjIAep0rT  
 CDialog::DoDataExchange(pDX); ^yWL,$  
 //{{AFX_DATA_MAP(CAboutDlg) r(:5kC8K  
 //}}AFX_DATA_MAP wo4;n9@I  
} h{%nC>m;  
e^8 O_VB  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]^yFaTfS  
 //{{AFX_MSG_MAP(CAboutDlg) 8[a=OP  
 // No message handlers <^VJy5>  
 //}}AFX_MSG_MAP [)H&'5 +F  
END_MESSAGE_MAP() ,|3MG",@@h  
^X=ar TE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nr95YSH  
: CDialog(CCaptureDlg::IDD, pParent) ,c;Kzp>e  
{ H3z: ZTI  
 //{{AFX_DATA_INIT(CCaptureDlg) {x|[p_?  
  m_bControl = FALSE; 8m-U){r!U^  
  m_bAlt = FALSE; RiDJ> 6S  
  m_bShift = FALSE; Pr3qo4t.L  
  m_Path = _T("c:\\"); *1 uKr9  
  m_Number = _T("0 picture captured."); 8L, 5Q9 $  
  nCount=0; Z?6%;n^ 54  
  bRegistered=FALSE; pV9IHs}  
  bTray=FALSE; o*b] p-  
 //}}AFX_DATA_INIT N@2dA*T,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ap.K=-H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IoxgjUa  
} bn#"?6Z2  
aT{_0m$G10  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;ic3).H  
{ ?Y$JWEPJ  
 CDialog::DoDataExchange(pDX); pM+ AjPr  
 //{{AFX_DATA_MAP(CCaptureDlg) \MA+f~)9  
  DDX_Control(pDX, IDC_KEY, m_Key); lNy.g{2f<m  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !02`t4Zc-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~Y`ldL  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4;w;'3zq  
  DDX_Text(pDX, IDC_PATH, m_Path); /sUYU (3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ghu#XJB?  
 //}}AFX_DATA_MAP h`]Iy  
} \RNNg  
?ME6+Z\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [glLre^  
//{{AFX_MSG_MAP(CCaptureDlg) 35A|BD) q  
 ON_WM_SYSCOMMAND() ?8I?'\F;  
 ON_WM_PAINT() zkt+7,vI  
 ON_WM_QUERYDRAGICON() <->{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o15-ZzE-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1 8|m)(W  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  '<jyw   
//}}AFX_MSG_MAP u#Pa7_zBj]  
END_MESSAGE_MAP() sr r :!5  
|v`AA?@{8  
BOOL CCaptureDlg::OnInitDialog() } K7#Q  
{ GD&uQ`Y5  
 CDialog::OnInitDialog(); .!Qki@  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (iBNZ7sJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); aEFJ;n7m  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 68NYIyTW9  
 if (pSysMenu != NULL) |EIng0a  
 { 9/{(%XwX  
  CString strAboutMenu; ~,d,#)VE2q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Hn7_FOC  
  if (!strAboutMenu.IsEmpty()) Mz9 r5  
  { ~xbe~$$Q@  
   pSysMenu->AppendMenu(MF_SEPARATOR); %d 1,a$*3}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tnV/xk#!  
  } QHDXW1+|^  
 } BTl k Etm  
 SetIcon(m_hIcon, TRUE); // Set big icon NiNM{[3oS  
 SetIcon(m_hIcon, FALSE); // Set small icon p?{Xu4(  
 m_Key.SetCurSel(0); ED2a}Tt>Z  
 RegisterHotkey(); h2)yq:87  
 CMenu* pMenu=GetSystemMenu(FALSE); e h&IPU S  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); dWM'fg  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *!4Z#Y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rK@8/?y5  
 return TRUE; // return TRUE unless you set the focus to a control v V'EZ ?  
} ob+b<HFv  
aB*Bz]5;E  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5<iV2Hx  
{ Bz_^~b7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gD0eFTN  
 { OtY`@\hy  
  CAboutDlg dlgAbout; aFc1|.Nm  
  dlgAbout.DoModal(); .4_o>D  
 } A|CmlAW~^  
 else *]. 7dec/  
 { Kh"?%ZIa  
  CDialog::OnSysCommand(nID, lParam); N@;?CKU  
 } -<c=US  
} bADnW4N`6;  
pe0F0Ruy  
void CCaptureDlg::OnPaint() f& 0M*o,)  
{ ?RX3MUN  
 if (IsIconic()) ~fBtQGdX  
 { ^aIPN5CK  
  CPaintDC dc(this); // device context for painting qBU-~"2t  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 214Ml0/%  
  // Center icon in client rectangle t![7uU.W  
  int cxIcon = GetSystemMetrics(SM_CXICON); MV! {j;g1<  
  int cyIcon = GetSystemMetrics(SM_CYICON); +cWLjPD/}  
  CRect rect; fr,7rS/w{l  
  GetClientRect(&rect); x"eRJii?  
  int x = (rect.Width() - cxIcon + 1) / 2; Xk:OL,c  
  int y = (rect.Height() - cyIcon + 1) / 2; _G_Cj{w  
  // Draw the icon ,K>I%_!1  
  dc.DrawIcon(x, y, m_hIcon); y6@0O%TDN  
 } Q0$8j-1I  
 else LU+3{O5y  
 { t^VwR=i  
  CDialog::OnPaint(); Bm.afsM;  
 } F^l[GdUosK  
} @(l^]9(V\  
|D'4uN8\  
HCURSOR CCaptureDlg::OnQueryDragIcon() lNNv|YiL  
{ sD<a+Lw}x  
 return (HCURSOR) m_hIcon; uvgdY  
} h}-3\8 >  
1ofKt=|=  
void CCaptureDlg::OnCancel() |o,YCzy|5  
{ d[[]P X  
 if(bTray) .=U#eHBdAQ  
  DeleteIcon(); J%8(kWQ|  
  CDialog::OnCancel(); _t:$XJ`bTk  
} ~Xr=4V:a+  
=Xm@YVf&ZD  
void CCaptureDlg::OnAbout() #XK2Ien)Z  
{ ?=>+LqP  
 CAboutDlg dlg; ?m![Pg%  
 dlg.DoModal(); Yi .u"sh]  
} "X2Vrn'  
-\+s#kE:  
void CCaptureDlg::OnBrowse() %mL-$*  
{ R5"K]~  
 CString str; $GYm6x\4  
 BROWSEINFO bi; 2*rH?dz8E  
 char name[MAX_PATH]; +nUy,S?43  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Qg^cf<X{i  
 bi.hwndOwner=GetSafeHwnd(); /`9sPR6e  
 bi.pszDisplayName=name; XttqO f  
 bi.lpszTitle="Select folder"; k $M]3}$U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Yaj0;Lo[wt  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); b6W2^tr-  
 if(idl==NULL) )_a~} U]=.  
  return; nJbtS#`G4  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `(T,+T4C5k  
 str.ReleaseBuffer(); _,q)hOI  
 m_Path=str; o5xAav"+>  
 if(str.GetAt(str.GetLength()-1)!='\\') )64@2 ~4y  
  m_Path+="\\"; #u2J;9P  
 UpdateData(FALSE); nv)2!mAh\  
} ;V^ 112|C  
BLN^ <X/  
void CCaptureDlg::SaveBmp() ilK-?@u+  
{ zs%Hb48V   
 CDC dc; vesJEaw7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); L{:9Cx!F  
 CBitmap bm; Nb?w|Ne(T  
 int Width=GetSystemMetrics(SM_CXSCREEN); CxGx8*<X  
 int Height=GetSystemMetrics(SM_CYSCREEN); lW<PoT  
 bm.CreateCompatibleBitmap(&dc,Width,Height); G,TM-l_uw  
 CDC tdc; qe#P?[  
 tdc.CreateCompatibleDC(&dc); qs|mj}?  
 CBitmap*pOld=tdc.SelectObject(&bm); . 7zK@6i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |M8WyW  
 tdc.SelectObject(pOld); t(GR)&>.2  
 BITMAP btm; =PUt&`1.a  
 bm.GetBitmap(&btm); ay1YOfa*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U;bK!&Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $f,n8]  
 BITMAPINFOHEADER bih; )v]/B+  
 bih.biBitCount=btm.bmBitsPixel; tS|9fBdCs  
 bih.biClrImportant=0; 1h>yu3O  
 bih.biClrUsed=0; '#LQN<"4  
 bih.biCompression=0; >:zK?(qu,N  
 bih.biHeight=btm.bmHeight; DvPlV q~  
 bih.biPlanes=1; h8 'v d3  
 bih.biSize=sizeof(BITMAPINFOHEADER); x&^_c0fn  
 bih.biSizeImage=size; tBNoI  
 bih.biWidth=btm.bmWidth; [v$0[IuY,  
 bih.biXPelsPerMeter=0; #BJG9DFP4`  
 bih.biYPelsPerMeter=0; p>vn7;s2#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I96C i2)m  
 static int filecount=0; !h(|\" }  
 CString name; \(VTt|}By$  
 name.Format("pict%04d.bmp",filecount++); 0OT\"O~S[  
 name=m_Path+name;  ]E_h  
 BITMAPFILEHEADER bfh; S5KEXnjm  
 bfh.bfReserved1=bfh.bfReserved2=0; fR)m%m  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <cZGxff01  
 bfh.bfSize=54+size; k4,BNJt'Z  
 bfh.bfOffBits=54; ?6(I V]  
 CFile bf; UJ0<%^f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Dw=gs{8D  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vy_D>tp  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '7D,m H  
  bf.WriteHuge(lpData,size); 4%2~Wi8  
  bf.Close(); !l|5z G  
  nCount++; ; l&4V  
 } I/M_p^  
 GlobalFreePtr(lpData); 4 SHU  
 if(nCount==1) Rop'e8Q  
  m_Number.Format("%d picture captured.",nCount); ZIPl7tTw  
 else _ ):d`O e  
  m_Number.Format("%d pictures captured.",nCount); |fxA|/ s[<  
  UpdateData(FALSE); 0q.Ujm=,z  
} vohoLeJTj  
SfJA(v@E  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) N>Eqj>G  
{ `(v='$6}  
 if(pMsg -> message == WM_KEYDOWN) O=v#{ [  
 { -od!J\ KCy  
  if(pMsg -> wParam == VK_ESCAPE) fbWFLS m;  
   return TRUE; KBXK0zWh7  
  if(pMsg -> wParam == VK_RETURN) xY+VyOUs  
   return TRUE; XW -2~?$  
 } X/z6"*(|/  
 return CDialog::PreTranslateMessage(pMsg); s7g(3<(  
} /CuXa%Ci^  
T<JwD[ (  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =8r 0 (c  
{  %ObLWH'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ AS E91T~  
  SaveBmp(); >ELlnE8  
  return FALSE; }"|"Q7H  
} e{X6i^% m_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Dfps gY)/?  
 CMenu pop; YY&l?*M<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S-7'it!1  
 CMenu*pMenu=pop.GetSubMenu(0); Ubh{!Y  
 pMenu->SetDefaultItem(ID_EXITICON); 1QcT$8HA  
 CPoint pt; gXonF'  
 GetCursorPos(&pt); R)F;py8)I  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >w-;Z>3Q@  
 if(id==ID_EXITICON) j. *VJazb;  
  DeleteIcon(); KhCzD[tf  
 else if(id==ID_EXIT) TMs,j!w?I  
  OnCancel(); Mva3+T  
 return FALSE; O(tX8P Q5N  
} }tH[[4tw,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nSF``pp+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PqyA1  
 AddIcon(); UA4J>1 i  
 return res; B3H|+  
} /;7y{(o  
|J+(:{ }~  
void CCaptureDlg::AddIcon() Z.W66\8~}^  
{ s[K^9wz  
 NOTIFYICONDATA data; RlqQ  
 data.cbSize=sizeof(NOTIFYICONDATA); &ISb~5  
 CString tip; :Xn7Ha[f  
 tip.LoadString(IDS_ICONTIP); !ALKSiSl  
 data.hIcon=GetIcon(0); Yk'9U-.mc  
 data.hWnd=GetSafeHwnd(); 3' ~gvi I  
 strcpy(data.szTip,tip); B|C/ Rk6?  
 data.uCallbackMessage=IDM_SHELL; +$$$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #'-Sh7ycW  
 data.uID=98; UK$ms~H  
 Shell_NotifyIcon(NIM_ADD,&data); `6[I^qG".  
 ShowWindow(SW_HIDE); -29gL_dk.  
 bTray=TRUE; 2u"7T_"2D  
} =/u% c!  
pG34Qw  
void CCaptureDlg::DeleteIcon() V7Z4T6j4  
{ o]ag"Q  
 NOTIFYICONDATA data; uGwJ K`!~  
 data.cbSize=sizeof(NOTIFYICONDATA); [6)UhS8  
 data.hWnd=GetSafeHwnd(); KjFK/Og.  
 data.uID=98; Ti2Ls5H}  
 Shell_NotifyIcon(NIM_DELETE,&data); !IC-)C,q  
 ShowWindow(SW_SHOW); ~`GhS<D  
 SetForegroundWindow(); kdxz!  
 ShowWindow(SW_SHOWNORMAL); WYIQE$SEv  
 bTray=FALSE; /erN;Oo%<  
} ~%/Wupf  
3)ma\+< 6  
void CCaptureDlg::OnChange() 28hHabd|  
{ !" JfOu  
 RegisterHotkey(); yMZHUd  
} QDTBWM%  
8>7RxSF  
BOOL CCaptureDlg::RegisterHotkey() b1gaj"]  
{ Fhv2V,nZ<  
 UpdateData(); T1` |~Z?g-  
 UCHAR mask=0; C@Nv;;AlU  
 UCHAR key=0; +&X%<S W  
 if(m_bControl) -w;(cE  
  mask|=4; v}sY|p"  
 if(m_bAlt)  Og2vGzD  
  mask|=2; p1D[YeF4  
 if(m_bShift)  cO\-  
  mask|=1; t ?h kL  
  key=Key_Table[m_Key.GetCurSel()]; $s4Wkq  
 if(bRegistered){ D?~8za`5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E"%2)  
  bRegistered=FALSE; ' JdkUhq1V  
 } WKr X,GF  
 cMask=mask; rZojY}dWJ  
 cKey=key; 6cdMS[_SD(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?sBh=Ds  
 return bRegistered; B/J>9||g  
} hH->%*  
>tG+?Y'{  
  四、小结 ? b[n|^wS  
C{Asp  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
10+5=?,请输入中文答案:十五