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
  • 6457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: m&yHtnt  
  y|=KrvMHJ  
  一、实现方法 R;pIi/yDRe  
BNe>Lko  
  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: ~^'WHuz Py  
U{qwhz(  
#pragma data_seg("shareddata") ^q`RaX)  
HHOOK hHook =NULL; //钩子句柄 /;vHAtt;f  
UINT nHookCount =0; //挂接的程序数目 IwBO#HR~)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D<:zw/IRE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 X,c`,B03  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "_2;+@+  
static int KeyCount =0; c>3j $D+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Nf)SR#;  
#pragma data_seg() "&{.g1i9  
5(GVwv  
  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。 :;c`qO4  
gW^4@q  
  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: W7;RQ  
Al]*iw{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR O\gVB!x  
cKey,UCHAR cMask) 6Eus_aP  
{ jcjl q-x  
 BOOL bAdded=FALSE; ~1aM5Ba{  
 for(int index=0;index<MAX_KEY;index++){ 8)2M%R\THn  
  if(hCallWnd[index]==0){ OO'zIC<z  
   hCallWnd[index]=hWnd; A2p%Y},  
   HotKey[index]=cKey; C9_[ke[1D  
   HotKeyMask[index]=cMask; xB]^^ NYE=  
   bAdded=TRUE; 6oFA=CjU{  
   KeyCount++; oIQ$98M  
   break; #2lvRJB  
  } GHo mk##0E  
 } u/NcX  
 return bAdded; I-=Ieq"R9  
} _k;HhLj`  
//删除热键 2G<XA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u%6b|M@P  
{ LM 1Vsh<  
 BOOL bRemoved=FALSE; sl"H!cwF  
 for(int index=0;index<MAX_KEY;index++){ tK?XU9o  
  if(hCallWnd[index]==hWnd){ [>U2!4=$M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pe>?m^gz[  
    hCallWnd[index]=NULL; Jw>na _FJ  
    HotKey[index]=0; TA8  
    HotKeyMask[index]=0; O OXP1L  
    bRemoved=TRUE; -%Ce  
    KeyCount--; +G\i$d;St  
    break; |f\WVGH  
   } ZD7qw*3+  
  } ~3&hvm[IQ  
 } OT$++cj^  
 return bRemoved; \KS.A 4  
} qq_ZkU@xg  
CJDNS21m  
HIt9W]koO  
  DLL中的钩子函数如下: o9yUJ@ :i  
OEX\]!3_Fm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LPZ\T} <l  
{ d{7)_Sbky  
 BOOL bProcessed=FALSE; 0P!Fci/t  
 if(HC_ACTION==nCode) KfPgj  
 { $dWYu"2C D  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~;YkR'q0_  
   switch(wParam) _3NH"o d  
   {  OF )*kiJ  
    case VK_MENU: [Q\(k d*4  
     MaskBits&=~ALTBIT; 3xmPY.  
     break; D #7q3s  
    case VK_CONTROL: P2 qC[1hYH  
     MaskBits&=~CTRLBIT; *cCj*Zr]  
     break; :h/v"2uDN  
    case VK_SHIFT: eAqpP>9n  
     MaskBits&=~SHIFTBIT; hy@b/Y![M  
     break; .<xD'54  
    default: //judge the key and send message ?A24h !7  
     break; F\ GNLi  
   } -N6ek`  
   for(int index=0;index<MAX_KEY;index++){ :XoR~syT  
    if(hCallWnd[index]==NULL) IS`ADDU[S  
     continue; baL<|& c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =P_ *.SgR  
    { Sfp-ns32%A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y+V>,W)r7  
     bProcessed=TRUE; cM4{ e^  
    } rY&#g%B6Fp  
   } (ip3{d{CT]  
  } pp{GaCi  
  else if((lParam&0xc000ffff)==1){ //有键按下 3`RI[%AN~  
   switch(wParam) G )`gn  
   { 3+ 2&9mm  
    case VK_MENU: \hb$v  
     MaskBits|=ALTBIT; Ts|;5ya5m  
     break; [-81s!#mkw  
    case VK_CONTROL: W^S]"N0u  
     MaskBits|=CTRLBIT; VR A+p?7-  
     break; A/fM30  
    case VK_SHIFT: S v#,L8f  
     MaskBits|=SHIFTBIT; MZh?MaBz06  
     break; SQ]M"&\{y  
    default: //judge the key and send message -V[!qI  
     break; R6:m@  
   } 8Bh micU  
   for(int index=0;index<MAX_KEY;index++){ hd[t&?{=  
    if(hCallWnd[index]==NULL) P"t Dq&  
     continue; k,8^RI07@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~V?\@R:g  
    { }<w9Jfr"X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %qqeL   
     bProcessed=TRUE; tB4yj_ZF  
    } }w2Et  
   } D0MW~Y6{  
  } gS`Z>+V5!c  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 G `B=:s]  
   for(int index=0;index<MAX_KEY;index++){ cWo__EE  
    if(hCallWnd[index]==NULL) $2blF)uYE  
     continue; u6IM~kk>5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a40>_;}:x  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ae2SU4Jx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z:V<P,N  
   } $ 9E"{6;@  
  } ER@RWV 2  
 } *P5/S8c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {a9.0N:4  
} >Rb jdM5K4  
0dI7{o;<|  
  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: ,OP\^  
4!-R&<TLve  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z@$'fX?~9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )nK+`{;@!  
1=!2|D:C)i  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: !YlEXaS  
&Fjyi"8(r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) : t75iB=  
{ m5HMtoU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) kGakdLl  
 { 8493O x4 O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 i=pfjC  
  SaveBmp(); </SO#g^r<  
  return FALSE; kE!ky\E  
 } qzLD  
 …… //其它处理及默认处理 xgM\6e  
} g2 mq?q(g  
zzh7 "M3Qn  
7uF @Xh  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 w !<-e>  
knb0_nA  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Mii&doU  
9y} J|z  
  二、编程步骤 NqFfz9G)  
v:>sS_^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; [biz[ fm  
+bb-uoZf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; wqap~X  
LcNI$g;}Yf  
  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; R? N+./{  
Nd@/U c  
  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; a"Ly9ovW  
O0bOv S  
  5、 添加代码,编译运行程序。 )|5mW  
=KD[#au6a  
三、程序代码 t#-4edB,  
l <Z7bo  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r&:yZN  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :6m"}8*q8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ RQ#9[6w!v  
#if _MSC_VER > 1000 iV\*7  
#pragma once - ku8n%u  
#endif // _MSC_VER > 1000 yZNg[KH  
#ifndef __AFXWIN_H__ 2Qc_TgWF  
#error include 'stdafx.h' before including this file for PCH 3RcnoXX_  
#endif Z*v`kl  
#include "resource.h" // main symbols }>3jHWxLc  
class CHookApp : public CWinApp TQ[J,  
{ _. EM])b  
 public: C8 }=fa3u  
  CHookApp(); vNZ"x)?  
  // Overrides ]~ S zb  
  // ClassWizard generated virtual function overrides nf:wJ-;*  
  //{{AFX_VIRTUAL(CHookApp) 2uF'\y  
 public: {W%XS E  
  virtual BOOL InitInstance(); J@IKXhb7_  
  virtual int ExitInstance(); *xKy^f  
  //}}AFX_VIRTUAL R+/kx#^  
  //{{AFX_MSG(CHookApp) V{\1qg{  
  // NOTE - the ClassWizard will add and remove member functions here. T$;BZ=_  
  // DO NOT EDIT what you see in these blocks of generated code ! fl4'dv  
  //}}AFX_MSG R4zOiBi'B  
  DECLARE_MESSAGE_MAP() Z]5xy_La  
}; gh `_{l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); E% Ko[G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fj9&J[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "tDB[?  
BOOL InitHotkey(); r $YEq5  
BOOL UnInit(); )2u_c=  
#endif R[m+s=+  
a\B?J  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. H6KBXMYO  
#include "stdafx.h" %.fwNS  
#include "hook.h" 5*Dh#FRp  
#include <windowsx.h> f Avh!g  
#ifdef _DEBUG  _BCq9/  
#define new DEBUG_NEW y"K[#&,0  
#undef THIS_FILE KR%NgV+}!0  
static char THIS_FILE[] = __FILE__; 'mF&`BN}b  
#endif c s:E^  
#define MAX_KEY 100 G1 I<B  
#define CTRLBIT 0x04 };gcM @]]E  
#define ALTBIT 0x02 i@%a!].I  
#define SHIFTBIT 0x01 6!=q+sw/X  
#pragma data_seg("shareddata") Vp1Nk#H  
HHOOK hHook =NULL; >yLdrf  
UINT nHookCount =0; y~VLa  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ItZ*$I1<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gXY]NWI  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SR<W3a\  
static int KeyCount =0; @Q!Tvw/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift qmNG|U&  
#pragma data_seg() ="AaC!E,W  
HINSTANCE hins; uw@-.N^  
void VerifyWindow(); fEGnI\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \(zUI  
//{{AFX_MSG_MAP(CHookApp) ^^YP kh6sS  
// NOTE - the ClassWizard will add and remove mapping macros here. QVl"l'e8  
// DO NOT EDIT what you see in these blocks of generated code! _!?a9  
//}}AFX_MSG_MAP iWkC: fQz  
END_MESSAGE_MAP() (SA^> r  
],'"iVh  
CHookApp::CHookApp() 3XncEdy_  
{ BJp~/H`vd  
 // TODO: add construction code here, ^t`0ul]c  
 // Place all significant initialization in InitInstance y6H`FFqK  
} [LV>z  
Su+[Q6oC@  
CHookApp theApp; 8LY^>.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )d{fDwrx1  
{ C[><m2T  
 BOOL bProcessed=FALSE; F8\JL %  
 if(HC_ACTION==nCode) 3k/X;:,.  
 { hdH3Jb_hl(  
  if((lParam&0xc0000000)==0xc0000000){// Key up FgR9$ is+  
   switch(wParam) B& 5Md.h  
   { u!t<2`:h  
    case VK_MENU: Xs~IoU  
     MaskBits&=~ALTBIT; }yd!UU  
     break; 1`~.!yd8(  
    case VK_CONTROL: xE*. ,:,&  
     MaskBits&=~CTRLBIT; 5d-rF:#  
     break; &WS'Me  
    case VK_SHIFT: ;RMevVw|  
     MaskBits&=~SHIFTBIT; Q+O./1x*,  
     break; J2$,'(!(  
    default: //judge the key and send message ^bLFY9hSC  
     break; o76{;Bl\O  
   } iUZV-jl2/  
   for(int index=0;index<MAX_KEY;index++){ . \8"f]~  
    if(hCallWnd[index]==NULL) &QFc)QP{  
     continue; Fnd_\`9{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4MCj*ok<  
    { 0="wxB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g#G ]}8C  
     bProcessed=TRUE; ezS@`_pR;  
    } N).'>  
   } X]=8Oa  
  } RxVZn""  
  else if((lParam&0xc000ffff)==1){ //Key down HI[Pf%${  
   switch(wParam) WfYG#!}x  
   { N%)q.'M  
    case VK_MENU: l;B  
     MaskBits|=ALTBIT; `(E$-m-~jH  
     break; bzECNi5^  
    case VK_CONTROL: a&7uRR26  
     MaskBits|=CTRLBIT; VDiW9]  
     break; p@oz[017/J  
    case VK_SHIFT: b&9~F6aM  
     MaskBits|=SHIFTBIT; StiWa<"c  
     break; [n3@*)q's  
    default: //judge the key and send message D J7U6{KLq  
     break; s? 2ikJq  
   }  hV fANbs  
   for(int index=0;index<MAX_KEY;index++) @E>I<j,D  
   { D[Q/:_2l  
    if(hCallWnd[index]==NULL) +fQJ#?N2n  
     continue; dZ4c!3'F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZzxWKIE'c  
    { eYevj[c;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YdN]Tqc  
     bProcessed=TRUE; beNy5~M$  
    } ~y,m7%L  
   } '1~;^rU  
  } 3^-\=taN<m  
  if(!bProcessed){ 7;pQ'FmZJ  
   for(int index=0;index<MAX_KEY;index++){ b Rr3:"=sE  
    if(hCallWnd[index]==NULL) F45-M[z  
     continue; I__ a}|T%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M C y~~DL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PZI6{KOis  
   } jsP+,brO  
  } ')Y1c O  
 } e$&n)>%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5<P6PHdY  
} *U`R<mV\  
LCuz_LTFq{  
BOOL InitHotkey() 2rb@Md]dx  
{ =q*c}8R_0  
 if(hHook!=NULL){ yq[@Cw  
  nHookCount++; by\Sq}  
  return TRUE; DcE4r>8B  
 } |7${E^u  
 else #aiI]'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &=XK:+  
  if(hHook!=NULL) | /n  
   nHookCount++; <,X=M6$0n  
  return (hHook!=NULL); 3$.#\*s_4  
} Mq_P'/  
BOOL UnInit() ? 51i0~O=  
{ "]OROJGa  
 if(nHookCount>1){ 9TwKd0AT$&  
  nHookCount--; I1I-,~hO  
  return TRUE; 5Vai0Qfcu:  
 } Z;njSw%:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *,~L_)vWO  
 if(unhooked==TRUE){ 4um^7Ns)7  
  nHookCount=0; unKgOvtj  
  hHook=NULL; ?]o(cz  
 } L\V`ou  
 return unhooked; - FJLM  
} &xp]9$  
l=x(   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E'NS$,h  
{ 2jxIr-a1G  
 BOOL bAdded=FALSE; = |2F?  
 for(int index=0;index<MAX_KEY;index++){ X#zp,7j?  
  if(hCallWnd[index]==0){ 0& ?L%Y  
   hCallWnd[index]=hWnd; M27H{} v  
   HotKey[index]=cKey; {WQ6=wGpS  
   HotKeyMask[index]=cMask; vKfjP_0$  
   bAdded=TRUE; NK'@.=$  
   KeyCount++; -!K&\hEjj  
   break; k|{ 4"4r  
  } /_YTOSZjm  
 } y|zIu I-p  
 return bAdded; >]o>iOz;]  
} v["_t/_  
!~V^GlY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h4+*ssnYV  
{ d24_,o\_  
 BOOL bRemoved=FALSE; ?'tRu !~  
 for(int index=0;index<MAX_KEY;index++){ >(.Y%$9"E  
  if(hCallWnd[index]==hWnd){ 7 |GSs=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1N<n)>X4  
    hCallWnd[index]=NULL; $\|Q+7lQ  
    HotKey[index]=0; p}5413z5Z=  
    HotKeyMask[index]=0; oB~V~c}8x  
    bRemoved=TRUE; @;N(3| n7  
    KeyCount--; i% , 't  
    break; j(k}NWPH  
   } b*/Mco 9O  
  } #=;vg  
 } /Gn0|]KI  
 return bRemoved; X{<taD2~  
} ]Qa|9G,b  
WW2hwB (  
void VerifyWindow() i0J`{PbI  
{ :,g]Om^  
 for(int i=0;i<MAX_KEY;i++){ sZEa8  
  if(hCallWnd!=NULL){ S _ UAz  
   if(!IsWindow(hCallWnd)){ =LGSywWM9  
    hCallWnd=NULL; g/i%XTX>  
    HotKey=0; 1 -C~C]&  
    HotKeyMask=0; Ob}XeN(L3  
    KeyCount--; L u'<4 R  
   } B*w]yL(  
  } X8-x$07)  
 } ect$g#  
} `S.I,<&  
B2a#:E,6  
BOOL CHookApp::InitInstance() /Ov1eQBNG  
{ W/}_y8q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); L#J2J$ =  
 hins=AfxGetInstanceHandle(); &`m$Zzl;  
 InitHotkey(); nh"dPE7^  
 return CWinApp::InitInstance(); E.+%b;Eqe  
} 9NNXj^7  
i5&,Bpfo-  
int CHookApp::ExitInstance() $EEn]y  
{ ST;o^\B  
 VerifyWindow(); `w`F-ke]I  
 UnInit(); 9* huO#  
 return CWinApp::ExitInstance(); _zi| GD  
} 8R:Glif  
O0s!3hKu  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 08D:2 z1z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FSAX , Y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ C"%B >e  
#if _MSC_VER > 1000 (|rf>=B+H  
#pragma once /oLY\>pD  
#endif // _MSC_VER > 1000 MLg{Y?@  
%u_dxpx  
class CCaptureDlg : public CDialog kytHOn#  
{ C'R6mz%Q?  
 // Construction |0?v4%g  
 public: ]61HQ  
  BOOL bTray; 3D1y^I  
  BOOL bRegistered; Bq1}"092  
  BOOL RegisterHotkey(); ewHs ]V+U  
  UCHAR cKey; !n P4S)A  
  UCHAR cMask; ?Zsh\^k.g  
  void DeleteIcon(); ^8J`*R8CL  
  void AddIcon(); 6EO@ Xf7,  
  UINT nCount; VX>j2Z'  
  void SaveBmp(); 5Pxx)F9]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .Eb]}8/}E  
  // Dialog Data ~PpDrJ; Va  
  //{{AFX_DATA(CCaptureDlg) 4*Gv0#dga  
  enum { IDD = IDD_CAPTURE_DIALOG }; 41s\^'^&  
  CComboBox m_Key; v Y0ESc{  
  BOOL m_bControl; 8DY:a['-d  
  BOOL m_bAlt; pek=!nZ  
  BOOL m_bShift; V*5v JF0j  
  CString m_Path; !c1M{klP  
  CString m_Number; ".waCt6  
  //}}AFX_DATA ?6{g7S%  
  // ClassWizard generated virtual function overrides kS=nH9  
  //{{AFX_VIRTUAL(CCaptureDlg) dUt4] ar  
 public: F",TP,X  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ",J&UTUh  
 protected: 12m-$/5n+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Uzc p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %KkC1.yu<  
  //}}AFX_VIRTUAL au/LoO#6Ro  
  // Implementation VJT /9O)Z|  
 protected: Y_n3O@,  
  HICON m_hIcon; {"%a-*@%  
  // Generated message map functions kh:_,g  
  //{{AFX_MSG(CCaptureDlg) 3\ ,t_6}  
  virtual BOOL OnInitDialog(); x[Hx.G}5+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); peT91b  
  afx_msg void OnPaint(); _DT,iF*6  
  afx_msg HCURSOR OnQueryDragIcon(); dJQK|/  
  virtual void OnCancel(); 19c_=$mV  
  afx_msg void OnAbout(); &qWB\m  
  afx_msg void OnBrowse(); ,(zV~-:9  
  afx_msg void OnChange(); \w>Rmf'|  
 //}}AFX_MSG 1K<}  
 DECLARE_MESSAGE_MAP() HKI\i)c  
}; &Tj7qlP\  
#endif FQ1B%u|  
s }OL)rW=}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9+PAyI#w  
#include "stdafx.h" |iX>hJSl  
#include "Capture.h" xW*Lceb  
#include "CaptureDlg.h" kWVk^ ,  
#include <windowsx.h> D4|Ajeo;1  
#pragma comment(lib,"hook.lib") [ }Tb2|  
#ifdef _DEBUG r@qLG"[\c  
#define new DEBUG_NEW 9_iwikD  
#undef THIS_FILE wWfj#IB;R  
static char THIS_FILE[] = __FILE__; vmrs(k "d#  
#endif {*TB }Xsr,  
#define IDM_SHELL WM_USER+1 cs*E9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); czpu^BT;;T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <tZZ]Y]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j/=Tj'S?D  
class CAboutDlg : public CDialog *($,ay$&H  
{ |N% l at  
 public: F[yofR N  
  CAboutDlg(); <!XunXh  
  // Dialog Data +6P[TqR  
  //{{AFX_DATA(CAboutDlg) Skg/iH"(  
  enum { IDD = IDD_ABOUTBOX }; D&2NO/ R  
  //}}AFX_DATA o{fYoBgr  
  // ClassWizard generated virtual function overrides U5H%wA['m  
  //{{AFX_VIRTUAL(CAboutDlg) TK[[6IB  
 protected: L6Brs"9B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zGyRzxFN  
  //}}AFX_VIRTUAL C$~ly=@  
  // Implementation 1Q!^*D  
 protected: 2EZ7Vdz2  
  //{{AFX_MSG(CAboutDlg) !#W>x49}  
  //}}AFX_MSG 0F%8d@Y2  
  DECLARE_MESSAGE_MAP() d=%NFCIV  
}; `iM%R3&  
l&U$L N$*e  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8 b~  
{ SO(BkxV@  
 //{{AFX_DATA_INIT(CAboutDlg) yq[/9PciA  
 //}}AFX_DATA_INIT 9RHDkK{5  
} ^Cp2#d*  
N\B&|;-V  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) h ~yTkN]  
{ #)xlBq4cZ  
 CDialog::DoDataExchange(pDX); fuv{2[N V  
 //{{AFX_DATA_MAP(CAboutDlg) d;0]xG?%=  
 //}}AFX_DATA_MAP `N.:3]B t  
} WQ[n K5#  
'@hUmrl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =FV(m S  
 //{{AFX_MSG_MAP(CAboutDlg) R2a99#J  
 // No message handlers iz^uj  
 //}}AFX_MSG_MAP -V}xvSVg  
END_MESSAGE_MAP() _.V5-iN  
~5%3]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) JZ`h+fAt  
: CDialog(CCaptureDlg::IDD, pParent) g =Xy{Vm  
{ UCfouQCj  
 //{{AFX_DATA_INIT(CCaptureDlg) )1M2}11uS  
  m_bControl = FALSE; ,3T"fT-(  
  m_bAlt = FALSE; Uoe;=P@  
  m_bShift = FALSE; P658 XKE  
  m_Path = _T("c:\\"); -sKtT 9o  
  m_Number = _T("0 picture captured."); *nJ,|T  
  nCount=0; 7`t"fS  
  bRegistered=FALSE; >| ,`E  
  bTray=FALSE; _v0iH   
 //}}AFX_DATA_INIT E]/2 u3p  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .x,y[/[[)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OzrIiahz/  
} {TpbUj0  
76@W:L*J$J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `G\Gk|4; 2  
{ BQ Vro;#Jc  
 CDialog::DoDataExchange(pDX); l`N#~<.  
 //{{AFX_DATA_MAP(CCaptureDlg) %\sE\]K  
  DDX_Control(pDX, IDC_KEY, m_Key); YCltS!k  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d[,Rgdd@I  
  DDX_Check(pDX, IDC_ALT, m_bAlt); G>0d^bx;E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \|QB;7u  
  DDX_Text(pDX, IDC_PATH, m_Path);  d9k`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); v9Ii8{ca|  
 //}}AFX_DATA_MAP pMHl<HH  
} CE96e y  
9]lI?j]o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6_QAE6A  
//{{AFX_MSG_MAP(CCaptureDlg) ~&T U  
 ON_WM_SYSCOMMAND() 5Ex[}y9L`  
 ON_WM_PAINT() JFX}))7  
 ON_WM_QUERYDRAGICON() ~^a>C  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) T[1iZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V.*M;T\i  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *1kFy_Gx  
//}}AFX_MSG_MAP aHuMm&  
END_MESSAGE_MAP() qK d ="PR}  
jGz~}&B  
BOOL CCaptureDlg::OnInitDialog() l9Ol|Cb&  
{ n8;p]{  
 CDialog::OnInitDialog();  EG`AkWy  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); cb]X27uww  
 ASSERT(IDM_ABOUTBOX < 0xF000); q#mL-3OQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); JZ-@za6u  
 if (pSysMenu != NULL) ^-q{:lx  
 { n5UUoBv  
  CString strAboutMenu; /fb}]e]N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); sGhw23  
  if (!strAboutMenu.IsEmpty()) Cfmd*,  
  { e_Hpai<b  
   pSysMenu->AppendMenu(MF_SEPARATOR); iu8Q &Us0P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 96~y\X@x  
  } LJPJENtFIs  
 } J~WT;s  
 SetIcon(m_hIcon, TRUE); // Set big icon iQ:eR]7X  
 SetIcon(m_hIcon, FALSE); // Set small icon %?].( Lc  
 m_Key.SetCurSel(0); L%Zr3Ct  
 RegisterHotkey(); P7=`P  
 CMenu* pMenu=GetSystemMenu(FALSE); (["kbPma  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pu/5#[MC)^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;.sYE/ZVi  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^_@[1'^  
 return TRUE; // return TRUE unless you set the focus to a control 'a+^= c  
} {Dl@/fz  
z;oia!9z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TIiYic!_~  
{ "i#g [x  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4y3c=L No  
 { v"yu7tZ3N  
  CAboutDlg dlgAbout; B2]52Fg-"  
  dlgAbout.DoModal(); V{oFig 6  
 } VNT?  
 else bLG7{qp  
 { ])F+ C/Px1  
  CDialog::OnSysCommand(nID, lParam); B7'#8heDh  
 } $%bd`d*S  
} kEC^_sO"  
"*<vE7  
void CCaptureDlg::OnPaint() "}xIt)n%;  
{ +u$JMp  
 if (IsIconic()) lBFKfLp&  
 { v.8kGF  
  CPaintDC dc(this); // device context for painting n4dNGp7\`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H}~K51  
  // Center icon in client rectangle l VD{Y`)  
  int cxIcon = GetSystemMetrics(SM_CXICON); P-2DBNB7  
  int cyIcon = GetSystemMetrics(SM_CYICON); lq_UCCnv5  
  CRect rect; C=o-3w  
  GetClientRect(&rect); 9;6)b 0=$  
  int x = (rect.Width() - cxIcon + 1) / 2; 0M;El2 P$  
  int y = (rect.Height() - cyIcon + 1) / 2; QnS^ G{  
  // Draw the icon ._tEDY/1m  
  dc.DrawIcon(x, y, m_hIcon);  ;303fS  
 } cSYCMQ1ro  
 else 2_u+&7  
 { Z ;rM@x  
  CDialog::OnPaint(); H*k\C  
 } KH?6O%d  
} }[z7V  
sz270k%[  
HCURSOR CCaptureDlg::OnQueryDragIcon() U=KUx  
{ PUO7Z2  
 return (HCURSOR) m_hIcon; S>T ;`,  
} +|dL R*s  
~ 2Hw\fx  
void CCaptureDlg::OnCancel() HN367j2e  
{ Ln&~t(7  
 if(bTray) Z+U -+eG  
  DeleteIcon(); ',`Qx{tQ)  
  CDialog::OnCancel(); aE)1LP  
} Rq+7&%dy  
BV@q@C  
void CCaptureDlg::OnAbout() W*S4gPGM  
{ 7P3/Ky@6  
 CAboutDlg dlg; .yfp-n4H  
 dlg.DoModal(); %,vq@..^  
} x f{`uHa8  
9O&gR46.  
void CCaptureDlg::OnBrowse() R[\1Kk(Zo  
{ ylczM^@  
 CString str;  o%j?}J7y  
 BROWSEINFO bi; C1_0 9Vc  
 char name[MAX_PATH]; [7 PC\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); fWA# n  
 bi.hwndOwner=GetSafeHwnd(); >F7HKwg}Z  
 bi.pszDisplayName=name; H%l-@::+$  
 bi.lpszTitle="Select folder"; d:>^]5cE&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~v\ W[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zMpvS rc  
 if(idl==NULL) t=}]4&Yp  
  return; rZ(#t{]=!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hx@@[sKF7  
 str.ReleaseBuffer(); "__)RHH:8  
 m_Path=str; u0+F2+ I  
 if(str.GetAt(str.GetLength()-1)!='\\') L;*7p9  
  m_Path+="\\"; Xe&9| M  
 UpdateData(FALSE); %`s#p` Ol1  
} om`B:=+  
\Cq4r4'  
void CCaptureDlg::SaveBmp() ;&|I/MVm  
{ ]SAY\;,_  
 CDC dc; qm/>\4eLt  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); + @fEw  
 CBitmap bm; :](#W@ r  
 int Width=GetSystemMetrics(SM_CXSCREEN); sM)1w-  
 int Height=GetSystemMetrics(SM_CYSCREEN); :!t4.ko  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i^:#*Q-co  
 CDC tdc; a8)2I~j  
 tdc.CreateCompatibleDC(&dc); ]Zh$9YK  
 CBitmap*pOld=tdc.SelectObject(&bm); ,aezMbg  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?QKD YH(  
 tdc.SelectObject(pOld); 9xJtDdy-O  
 BITMAP btm; ]Kjt@F";  
 bm.GetBitmap(&btm); J?#vL\8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7wWx8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5V(#nz  
 BITMAPINFOHEADER bih; dKEy6C"@  
 bih.biBitCount=btm.bmBitsPixel; w2b(,w  
 bih.biClrImportant=0; (5Q<xJ  
 bih.biClrUsed=0; RgH 6l2  
 bih.biCompression=0; v9@_ DlV\  
 bih.biHeight=btm.bmHeight; Lbrn8,G\  
 bih.biPlanes=1; (FGy"o%TP'  
 bih.biSize=sizeof(BITMAPINFOHEADER); onmkg}&_  
 bih.biSizeImage=size; E71H=C 4  
 bih.biWidth=btm.bmWidth; @^ta)Ev  
 bih.biXPelsPerMeter=0; $A5O>  
 bih.biYPelsPerMeter=0; _VgFuU$h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o@PvA1  
 static int filecount=0; !!ZGNZ_  
 CString name; v]@ XyF\j8  
 name.Format("pict%04d.bmp",filecount++); oVP,a r0G  
 name=m_Path+name; T[e+iv<8j  
 BITMAPFILEHEADER bfh; sF :pwI5^  
 bfh.bfReserved1=bfh.bfReserved2=0; g2?W@/pa  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &?p( UY7'"  
 bfh.bfSize=54+size; b-VQn5W  
 bfh.bfOffBits=54; Q~f]?a`  
 CFile bf; xv147"w'v  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p)Q5fh0-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )Z4iM;4]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $; _{|{Yj  
  bf.WriteHuge(lpData,size); 5ad@}7&  
  bf.Close(); _-{=Z=?6}  
  nCount++; 1+3-Z>^e  
 } 3TjyKB *!  
 GlobalFreePtr(lpData); dzbbFvG  
 if(nCount==1) ; m |N 9'  
  m_Number.Format("%d picture captured.",nCount); kc$W"J@  
 else +|GHbwvp  
  m_Number.Format("%d pictures captured.",nCount); b(U5n"cdA  
  UpdateData(FALSE); wO!>kc<  
} Av n-Ug  
QYDI-<.(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p;, V  
{ )AieO-4*  
 if(pMsg -> message == WM_KEYDOWN) 6IK>v*<  
 { Z?[ R;V1j  
  if(pMsg -> wParam == VK_ESCAPE) u&={hJ&7  
   return TRUE; >_]Ov:5  
  if(pMsg -> wParam == VK_RETURN) # ^,8JRA  
   return TRUE; ;mD!8<~z.  
 } KU/QEeqbrp  
 return CDialog::PreTranslateMessage(pMsg); P^Og(F8;  
} B/Q>i'e  
e$ QMR.'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =7kn1G.(  
{ .& bc3cW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i,RbIZnJ  
  SaveBmp(); JY:Fu  
  return FALSE; sT iFh"8d>  
} vP'!&}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s^)(.e_  
 CMenu pop;  %>zG;4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {Eo Z }I  
 CMenu*pMenu=pop.GetSubMenu(0); X}={:T+6s  
 pMenu->SetDefaultItem(ID_EXITICON); `;R$Ji=>  
 CPoint pt; "\~>[on  
 GetCursorPos(&pt); M`=\ijUwN  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Fm&f  
 if(id==ID_EXITICON) '>bn94$  
  DeleteIcon(); =*-a c  
 else if(id==ID_EXIT) GM^H )8U  
  OnCancel(); !3c+}j-j  
 return FALSE; v?nGAn  
} ,B x0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =b)!l9TX  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8&+u+@H  
 AddIcon(); :*l\j"fX5  
 return res; tmoclK-  
} ?a, `{1m0\  
?)Gb=   
void CCaptureDlg::AddIcon() ,5~C($-t  
{ 9w0v?%%_  
 NOTIFYICONDATA data; &'i.W}Ib!  
 data.cbSize=sizeof(NOTIFYICONDATA); 3WGOftLzt  
 CString tip; f@Ve,i  
 tip.LoadString(IDS_ICONTIP); gm:Y@6W  
 data.hIcon=GetIcon(0); u  XZ;K.  
 data.hWnd=GetSafeHwnd(); 8 f~M6  
 strcpy(data.szTip,tip); :c}PW"0v  
 data.uCallbackMessage=IDM_SHELL; h6`VU`pPI  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \Yv4 4*I`  
 data.uID=98; md9JvbB  
 Shell_NotifyIcon(NIM_ADD,&data); 4/SltWU  
 ShowWindow(SW_HIDE); E.*wNah"U  
 bTray=TRUE; 6khm@}}  
} W8]?dL}|  
Qe9}%k6@E  
void CCaptureDlg::DeleteIcon() 7<8'7<X  
{ j\B taC  
 NOTIFYICONDATA data; `X&d:!}F  
 data.cbSize=sizeof(NOTIFYICONDATA); -@'RYY=  
 data.hWnd=GetSafeHwnd(); %vG;'_gM B  
 data.uID=98; D iHj!tZN  
 Shell_NotifyIcon(NIM_DELETE,&data); ^h`rA"F\  
 ShowWindow(SW_SHOW); Hp(41Eb,  
 SetForegroundWindow(); :q2RgZE  
 ShowWindow(SW_SHOWNORMAL); 5Ktll~+:#  
 bTray=FALSE; - ikq#L){  
} :de4Fje/4y  
WdJeh:h  
void CCaptureDlg::OnChange() ?WS.RBe2  
{ 3c`  
 RegisterHotkey(); mxc^IRj  
} ay{]Vqi9  
*`bES V :  
BOOL CCaptureDlg::RegisterHotkey() 6l"4F6  
{ @'J~(#}  
 UpdateData(); tg%Sn+:  
 UCHAR mask=0; hn&NypI  
 UCHAR key=0; 3Dh{#"88  
 if(m_bControl) 1iM(13jW  
  mask|=4; d-8g  
 if(m_bAlt)  $iH  
  mask|=2; 5VN~?#K  
 if(m_bShift) NfCo)C-t  
  mask|=1; O]25 {L  
  key=Key_Table[m_Key.GetCurSel()]; I|/|\  
 if(bRegistered){ eNFA.*p<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 85FzIX-F%  
  bRegistered=FALSE; Sn;q:e3i{A  
 } nu16L$ ]  
 cMask=mask; P^BSl7cT  
 cKey=key; 3[kl` *`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FT gt$I  
 return bRegistered;  )Z:maz  
} OtT*)8*c  
aMgg[g9>t  
  四、小结 EY:EpVin  
LXc;`]  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五