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
  • 7283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: h:U#F )  
  C^5 V  
  一、实现方法 v`jHd*&6)  
bq8Wvlv04  
  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: >M!LC  
Jw&Fox7p  
#pragma data_seg("shareddata") Ziub%C[oV  
HHOOK hHook =NULL; //钩子句柄 (fr=N5   
UINT nHookCount =0; //挂接的程序数目 ^c >Bh[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;"ESN)*|i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]NI CQ9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <5 OUk  
static int KeyCount =0; :vx<m_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T9!NuKfur  
#pragma data_seg() om9'A=ZU  
e=s85!  
  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。 &zJ\D`\,O  
L;y BZLM  
  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: #qR6TM&;  
4zt:3bW U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @V:Y%#%  
cKey,UCHAR cMask) GA/afc,V  
{ } XhL`%  
 BOOL bAdded=FALSE; \=[j9'N>  
 for(int index=0;index<MAX_KEY;index++){ QtXiUx^ k<  
  if(hCallWnd[index]==0){ W[a"&,okqO  
   hCallWnd[index]=hWnd; YTmHht{j#  
   HotKey[index]=cKey; Y'bz>@1(  
   HotKeyMask[index]=cMask; &WL::gy_S  
   bAdded=TRUE; r}^1dO  
   KeyCount++; L6i|5 P  
   break; /':64#'  
  } X%&7-PO  
 } XEagN:  
 return bAdded; /{jt]8/;7  
} >;Vfs{Z(q  
//删除热键 OI"g-+~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -$:*!55:j  
{ Skr0WQ  
 BOOL bRemoved=FALSE; jAue+ tB  
 for(int index=0;index<MAX_KEY;index++){ jb,a>9 ]p  
  if(hCallWnd[index]==hWnd){ 0'.z|Jg=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +F60_O `  
    hCallWnd[index]=NULL; j[FB*L1!D  
    HotKey[index]=0; !L q'o ?  
    HotKeyMask[index]=0; }7b{ZbDI  
    bRemoved=TRUE; g-_=$#&{  
    KeyCount--; frW\!r{LT  
    break; `w`N5 !  
   } (Fuu V{x|  
  } ZI qXkD  
 } X=Ar"Dx}}s  
 return bRemoved; Q&w_kz.  
} 4&%H;Q  
f(eXny@Y  
vO&X<5?Qc  
  DLL中的钩子函数如下: kONn7Itbu  
7][fciZN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #I.~+M  
{ }vx,i99W?  
 BOOL bProcessed=FALSE; kdlmj[=  
 if(HC_ACTION==nCode) fp\mBei  
 { P]y{3y:XxM  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <YEKbnw$o  
   switch(wParam) O-)[!8r  
   {  wb(S7OsMO  
    case VK_MENU: s_RK x)w@  
     MaskBits&=~ALTBIT; E<u(Yw6=  
     break; }fkdv6mz  
    case VK_CONTROL: z"\w9 @W  
     MaskBits&=~CTRLBIT; Qbjm,>H/^  
     break; 1y6<gptx  
    case VK_SHIFT: htL1aQ.  
     MaskBits&=~SHIFTBIT; hEZo{0:b"  
     break; 9I [:#,zdf  
    default: //judge the key and send message 50Gu~No6  
     break; !\d~9H%`B  
   } ^>!&]@  
   for(int index=0;index<MAX_KEY;index++){ *S}CiwW>/  
    if(hCallWnd[index]==NULL) )m8Gbkj<  
     continue; ar,v/l>d4N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SFtcO  
    { MZf?48"f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N}NKQ]=  
     bProcessed=TRUE; a?GXVQ  
    } &Z!y>k%6  
   } yih|6sd$F  
  } 2Og5e  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,xrA2  
   switch(wParam) i<>%y*+@  
   { L>E;cDB  
    case VK_MENU: \?Z7|   
     MaskBits|=ALTBIT; 1pG|jT+Bi  
     break; dZf1iFCP  
    case VK_CONTROL: bc~WJ+  
     MaskBits|=CTRLBIT; pV (Mh[ }P  
     break; YU+P+m2X  
    case VK_SHIFT: N#RC;  
     MaskBits|=SHIFTBIT; 1,$"'lKwt  
     break; X[$|I9  
    default: //judge the key and send message %g5#q64  
     break; J!6w9,T_  
   } >b9J!'G,(  
   for(int index=0;index<MAX_KEY;index++){ *q,nALs  
    if(hCallWnd[index]==NULL) E $\nb]JQ  
     continue; %O#zE-H"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L>g6 9D !  
    { X )Tyxppf'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +e*C`uP!  
     bProcessed=TRUE; /=AFle2(  
    } 3)o>sp)Ji$  
   } RyukQY~<W  
  } 3]lq#p:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RdyKd_0`Q  
   for(int index=0;index<MAX_KEY;index++){ }|) N5bGQe  
    if(hCallWnd[index]==NULL) 4ME$Z>eN  
     continue; fH_l2b[-3@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;r6YIS4@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q27q/q8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `EvO^L   
   } <o3I<ci6  
  } FJ!`[.t1AU  
 } ;vPFRiFK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4Y3@^8h&=  
} xhho{  
0[<' ygu  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: cV@^<  
rr(kFQ"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <vV"abk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a=y%+E'a '  
X@Zt4)2#  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: eNi#% ?=WB  
Tmu2G/yi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G,P k3>I'  
{ *\}$,/m['  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6|n3Q$p  
 { sGNHA( ;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 vRW;{,d  
  SaveBmp(); QQ{*j7i)  
  return FALSE; ;w]1H&mc*A  
 } 9eP*N(m<  
 …… //其它处理及默认处理 L>WxAeyu1K  
} AB+lM;_>  
>$CNR*}@  
~l] w=[ z  
  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。 {6Nbar@3  
L7GNcV]c  
  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。 /u9 0)x  
(vi^ t{k  
  二、编程步骤 y,1U]1TP  
,|?#+O{  
  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"; x5smJ__/  
lB/ ^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;*FY+jM  
F g):>];<9  
  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; N.]~%)K:{  
Yc~lYz+b  
  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; z(O*DwY#  
*0L3#. i  
  5、 添加代码,编译运行程序。 `}uM91;  
}uaFmXy3  
三、程序代码 e?07o!7[;  
.`J*l=u$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5\}Y=Pa  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %RF$Y=c'C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wouk~>Jft  
#if _MSC_VER > 1000 n!X%i+|4x  
#pragma once HpUJ_pZ  
#endif // _MSC_VER > 1000 o.|36#Fa  
#ifndef __AFXWIN_H__ o>d0R w4h  
#error include 'stdafx.h' before including this file for PCH b%@9j;  
#endif N.E{6_{S  
#include "resource.h" // main symbols  ('BB9#\t  
class CHookApp : public CWinApp ;$$w`LyP  
{ ds+2z=!!e  
 public: _(io8zqe{j  
  CHookApp(); }7{( o-  
  // Overrides ##F$8d)q  
  // ClassWizard generated virtual function overrides mAIl)mq|g  
  //{{AFX_VIRTUAL(CHookApp) 4XJ']M(5;  
 public: G\k&s F  
  virtual BOOL InitInstance(); KMfRMc&  
  virtual int ExitInstance(); Td7Q%7p:  
  //}}AFX_VIRTUAL ;"9Ks.  
  //{{AFX_MSG(CHookApp) 'h~IbP  
  // NOTE - the ClassWizard will add and remove member functions here. l9+CJAmq  
  // DO NOT EDIT what you see in these blocks of generated code !  >}]bKq  
  //}}AFX_MSG .v+J@Y a  
  DECLARE_MESSAGE_MAP() QJR},nZ3  
}; O)&ME  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); GuL0:,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]0%{ IgB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3&c'3y:b  
BOOL InitHotkey();  myOW^  
BOOL UnInit(); }> C?Zx*  
#endif t)k;5B`> &  
LSXsq}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5OO XCtIKf  
#include "stdafx.h" ,?%Y*?v  
#include "hook.h" )ytP$,r![S  
#include <windowsx.h> :AuKQ`c  
#ifdef _DEBUG P&Xy6@%[Z  
#define new DEBUG_NEW DSp~k)  
#undef THIS_FILE :c )R6=v  
static char THIS_FILE[] = __FILE__; UaQW<6+  
#endif z1tCSt}7f  
#define MAX_KEY 100 ^n4aoj  
#define CTRLBIT 0x04 wu{%gtx/;^  
#define ALTBIT 0x02 -H_#et3&i  
#define SHIFTBIT 0x01 k!+v*+R+V  
#pragma data_seg("shareddata") 7pep\  
HHOOK hHook =NULL; }PDtx:T-  
UINT nHookCount =0; AtAu$"ue  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6*>vie  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT q %tq9%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i{Q,>Rt  
static int KeyCount =0; juM~X5b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P^lRJB<$Q  
#pragma data_seg() S4(?= ,^-  
HINSTANCE hins; ,L>{(Q)  
void VerifyWindow(); 9 v ,y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~Z#\f5yv@  
//{{AFX_MSG_MAP(CHookApp) [fkt3fS  
// NOTE - the ClassWizard will add and remove mapping macros here. |-GbHfz  
// DO NOT EDIT what you see in these blocks of generated code! 0BjP|API  
//}}AFX_MSG_MAP duCXCX^n T  
END_MESSAGE_MAP() }J\7IsM&  
C^U>{jf !  
CHookApp::CHookApp() q="ymx~  
{ += gU`<\  
 // TODO: add construction code here, we*E}U4  
 // Place all significant initialization in InitInstance >w\3.6A  
} }ri7@HCY4  
 @_WZZ  
CHookApp theApp; md : Wx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DC$> 5FDv  
{ j \ #y  
 BOOL bProcessed=FALSE; w/(2fU(  
 if(HC_ACTION==nCode) nAj +HLO  
 { y{tM|  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,|UwZ_.  
   switch(wParam) Di$++T8"  
   { oMq:4W,  
    case VK_MENU: ._'.F'd  
     MaskBits&=~ALTBIT; ~"R;p}5 "  
     break; ukD:4s v  
    case VK_CONTROL: 2Aa  
     MaskBits&=~CTRLBIT; kCoEdQ_  
     break; ah!RQ2hDrV  
    case VK_SHIFT: 2&o3OKt  
     MaskBits&=~SHIFTBIT; jgYe\dinM  
     break; YB]^Y^"e  
    default: //judge the key and send message {qSYe!`  
     break;  {qH+S/  
   } >-`-D=!V  
   for(int index=0;index<MAX_KEY;index++){ ai4ro"H  
    if(hCallWnd[index]==NULL) 2)q$HUIX  
     continue; +]C|y ,r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :pP l|"  
    { $f6wmI;<y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >lO]/3j1  
     bProcessed=TRUE; P&Hhq>@Z  
    } R}OjSiS\  
   } w~e$ul(IQM  
  } 6ZGw 3p)  
  else if((lParam&0xc000ffff)==1){ //Key down 5@i(pVWZ  
   switch(wParam) pr1>:0dg  
   { 7 /DDQ  
    case VK_MENU: "j}fcrlG9  
     MaskBits|=ALTBIT; Bjb8#n04  
     break; BUla2p  
    case VK_CONTROL: 95tHi re  
     MaskBits|=CTRLBIT; ::Di  
     break; P"+K'B7K3  
    case VK_SHIFT: QUc&f+~  
     MaskBits|=SHIFTBIT; nN[QUg  
     break; _w9 :([_  
    default: //judge the key and send message  }_?FmuU  
     break; gBXbB9  
   } z"{Ji{>%=  
   for(int index=0;index<MAX_KEY;index++) r5!Sps3B  
   { w"E.Va  
    if(hCallWnd[index]==NULL) ?)/&tk9.n  
     continue; \ 3l3,VYH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <\\,L@  
    { .W0;Vhw"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *U|2u+| F  
     bProcessed=TRUE; <%LN3T  
    } I h 19&D  
   } "nn>I}jK  
  } Q\Nz^~dQ:Y  
  if(!bProcessed){ >xm:?WR  
   for(int index=0;index<MAX_KEY;index++){ Eg]tDPN1  
    if(hCallWnd[index]==NULL) #)<WQZ)  
     continue; "3uPK$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pQBhheiM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9%bqY9NFd  
   } W}>wRy  
  } { Em fw9L  
 } 4jz2x #T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X>s'_F?  
} ! d" i  
P%kJq^&  
BOOL InitHotkey() X}j_k=,C  
{ ?\T):o;/  
 if(hHook!=NULL){ c_.4~>qw  
  nHookCount++; UP e@>  
  return TRUE; K<D=QweOon  
 }  *4{GI D  
 else .s>PDzM $  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2z=aP!9]  
  if(hHook!=NULL) ^CQVqa${]  
   nHookCount++; vKcc|#  
  return (hHook!=NULL); +Zo&c}  
} Kx5VR4f`J@  
BOOL UnInit() SXm Hn.?  
{ VA@t8H,  
 if(nHookCount>1){ Q.])En >i  
  nHookCount--; a2`|6M;  
  return TRUE; lG!We'?  
 } "ll TVB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }6^d/nE*T  
 if(unhooked==TRUE){ j= Ebk;6p  
  nHookCount=0; Nh/B8:035  
  hHook=NULL; vB T]a  
 } uf&Ke k,  
 return unhooked; DAtZp%  
} K#<cuHGC  
Ct,|g =(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j @+QwZL|  
{ xHY#"   
 BOOL bAdded=FALSE; P% ZCACzV  
 for(int index=0;index<MAX_KEY;index++){ | ?])]F  
  if(hCallWnd[index]==0){ ;/]v mgl2  
   hCallWnd[index]=hWnd; a jyuk@  
   HotKey[index]=cKey; %nkP?gn"a  
   HotKeyMask[index]=cMask; exQU  
   bAdded=TRUE; !XJS"owr  
   KeyCount++; zw,=mpf3_  
   break; &>&UqWL  
  } DU>#eR0G  
 } iw ==q:$  
 return bAdded; ",gWO 8T  
} nVVQ^i}`G  
*/JMPw&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l;C00ZBOc  
{ M@b:~mI[sw  
 BOOL bRemoved=FALSE; ^dF?MQA<@  
 for(int index=0;index<MAX_KEY;index++){ CHPu$eu  
  if(hCallWnd[index]==hWnd){ OLS.0UEc  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a J&)-ge  
    hCallWnd[index]=NULL; i{ " g 7  
    HotKey[index]=0; |wFfVDp  
    HotKeyMask[index]=0; ev_4!+ko  
    bRemoved=TRUE; (dh{Gk4=+  
    KeyCount--; -U"h3Ye^  
    break; R!8qkG  
   } yRt>7'@X  
  } 1D/9lR,  
 } nA#FGfZ{Ge  
 return bRemoved; mDT"%I"4j  
} YA vOV-L  
QmpP_eS >  
void VerifyWindow() =83FCq"  
{ r#xq 8H=_m  
 for(int i=0;i<MAX_KEY;i++){ iVg3=R)[1  
  if(hCallWnd!=NULL){ ~RRp5x _  
   if(!IsWindow(hCallWnd)){ */ ~_3  
    hCallWnd=NULL; vl{G;[6  
    HotKey=0; K~ 6[zJ4  
    HotKeyMask=0; G2A^+R0\  
    KeyCount--; ~x:B@Ow  
   } drr n&y  
  } X?'v FC  
 } ,a&&y0,  
} xKl!{A9$w  
sfv{z!mo  
BOOL CHookApp::InitInstance() f`dQ $Kh  
{ Y30e7d* qr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); NR* s7>  
 hins=AfxGetInstanceHandle(); "5+x6/9b  
 InitHotkey(); 0KQDw  
 return CWinApp::InitInstance(); 8hK\Ya:mP  
} e95x,|.-_  
># {,(8\  
int CHookApp::ExitInstance() &ZmHR^Flz  
{ 91 ]"D;NN  
 VerifyWindow(); V@QWJZ"  
 UnInit(); xTy[X"sJ  
 return CWinApp::ExitInstance(); yMQZulCWE  
} @w H+,]xE  
VhWF(*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5V|D%t2N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <)vjoRv  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]%RX\~Q.4  
#if _MSC_VER > 1000 K|n$-WDG}  
#pragma once ^WZcM#~TL  
#endif // _MSC_VER > 1000 6WN1D W  
/n9yv  
class CCaptureDlg : public CDialog zj?^,\{A  
{ Y_H|Fl^  
 // Construction QL<uQ`>(  
 public: &g{b5x{iD  
  BOOL bTray; u9.x31^  
  BOOL bRegistered; :2qUel\PEC  
  BOOL RegisterHotkey(); Zi0B$3iOb  
  UCHAR cKey; :KJG3j?   
  UCHAR cMask; S-M| 6fv  
  void DeleteIcon(); |m^qA](M  
  void AddIcon(); @bc=O1vX~;  
  UINT nCount; 8b^v@|)N  
  void SaveBmp(); xS4B"/  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A 11w{`EM  
  // Dialog Data &s +DK `  
  //{{AFX_DATA(CCaptureDlg) <rO0t9OH  
  enum { IDD = IDD_CAPTURE_DIALOG }; qB`-[A9HPe  
  CComboBox m_Key; KNkVI K  
  BOOL m_bControl; &m>yY{ be  
  BOOL m_bAlt; TTJFF\$?  
  BOOL m_bShift; m_ |:tU(t  
  CString m_Path; (#dwIBBFt  
  CString m_Number; F|eKt/>e  
  //}}AFX_DATA A@-A_=a,  
  // ClassWizard generated virtual function overrides YkPc&&#  
  //{{AFX_VIRTUAL(CCaptureDlg) Ly?%RmHK  
 public: *@XJ7G[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;Y&<psQeb  
 protected: =`8%qh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z# +{ksU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lHV&8fny  
  //}}AFX_VIRTUAL QWo_Zg0"  
  // Implementation | JmEI9n2  
 protected: aaN|g{pX  
  HICON m_hIcon; w4:  
  // Generated message map functions 7 +RsZu  
  //{{AFX_MSG(CCaptureDlg) -|?I'~[#(  
  virtual BOOL OnInitDialog(); .=j]PckJO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y%y F34  
  afx_msg void OnPaint(); jLANv{"  
  afx_msg HCURSOR OnQueryDragIcon(); w3l+BUn:X  
  virtual void OnCancel(); P4M*vZq)  
  afx_msg void OnAbout(); 3$.R=MQ7  
  afx_msg void OnBrowse(); }mz6z<pJ_  
  afx_msg void OnChange(); P,$|.p d'  
 //}}AFX_MSG k *a?Ey$  
 DECLARE_MESSAGE_MAP() e~Oge  
}; N W/RQ(  
#endif PRs[! EB6  
X&B2&e;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $_j\b4]%  
#include "stdafx.h" k/"^W.B aj  
#include "Capture.h" kIm)Um  
#include "CaptureDlg.h" .pP{;:Avpn  
#include <windowsx.h> mSw$? >  
#pragma comment(lib,"hook.lib") l>KkK|!T^i  
#ifdef _DEBUG 0@FZQ$-  
#define new DEBUG_NEW }b// oe7  
#undef THIS_FILE (QO8_  
static char THIS_FILE[] = __FILE__; dG6 G  
#endif W[5a'}OV  
#define IDM_SHELL WM_USER+1 %n^jho5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F"3LG"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J 8/]&Ow  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #cN0ciCT'  
class CAboutDlg : public CDialog 7e{w)m:A  
{ 5hVp2 w-  
 public: GI&XL'K&  
  CAboutDlg(); B74L/h  
  // Dialog Data U]Iypl`l  
  //{{AFX_DATA(CAboutDlg) #].n0[  
  enum { IDD = IDD_ABOUTBOX }; R]0p L   
  //}}AFX_DATA `N+A8  
  // ClassWizard generated virtual function overrides bNUb  
  //{{AFX_VIRTUAL(CAboutDlg) mkA1Sh{hX>  
 protected: RXMzwk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u7rA8u|TO  
  //}}AFX_VIRTUAL eXHk6[%[  
  // Implementation +=XDNSw  
 protected: lJ+05\pE  
  //{{AFX_MSG(CAboutDlg) P/BWFN1  
  //}}AFX_MSG e<Hbm  
  DECLARE_MESSAGE_MAP() ;.=ZwM]C  
}; O!0YlIvWv  
r<Il;?S6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) we6kV-L.  
{ n=HId:XT  
 //{{AFX_DATA_INIT(CAboutDlg) `Qf$]Eoft  
 //}}AFX_DATA_INIT "bO\Wt#Mf  
} sh $mOy  
Z9:erKT   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dQ4VpR9|;  
{ %J*z!Fe8s  
 CDialog::DoDataExchange(pDX); 6} DGEHc1  
 //{{AFX_DATA_MAP(CAboutDlg) CM}1:o<<N  
 //}}AFX_DATA_MAP fl{wF@C6  
} o gcEv>0  
!"*!du28jo  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 54TW8y `h  
 //{{AFX_MSG_MAP(CAboutDlg) ]K]$FX<f  
 // No message handlers 2v ^bd^]u:  
 //}}AFX_MSG_MAP '#~$Od4&=  
END_MESSAGE_MAP() ?\GILB,  
hJqLH ?Ri  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) hXsd12  
: CDialog(CCaptureDlg::IDD, pParent) /~w!7n<7  
{ fS08q9,S/  
 //{{AFX_DATA_INIT(CCaptureDlg) 0?)U?=>]p  
  m_bControl = FALSE;  xc%\%8C}  
  m_bAlt = FALSE; I3;{II  
  m_bShift = FALSE; EXlmIY4  
  m_Path = _T("c:\\"); vvJ{fi  
  m_Number = _T("0 picture captured."); s "KPTV  
  nCount=0; ^CIO,I  
  bRegistered=FALSE; 2$>"4 N  
  bTray=FALSE; v/n4Lp$W^  
 //}}AFX_DATA_INIT (1~d/u?2\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9:|z^r  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); AlW0GK=N-p  
} V SJGp`  
tb^8jC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Nm{\?  
{ .ZuRH_pI  
 CDialog::DoDataExchange(pDX); r(ej=aR  
 //{{AFX_DATA_MAP(CCaptureDlg) )E--E+j  
  DDX_Control(pDX, IDC_KEY, m_Key); )ZxDfRjL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Xb0$BAP  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 72hN%l   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); d|GQZAEJEt  
  DDX_Text(pDX, IDC_PATH, m_Path); (w31W[V'#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Gp0H[-oF  
 //}}AFX_DATA_MAP bRSE"B  
}  U 6((  
k)Y}X)\36  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^ olaq(z  
//{{AFX_MSG_MAP(CCaptureDlg) i$~2pr  
 ON_WM_SYSCOMMAND() N=1zhI:VaQ  
 ON_WM_PAINT() AJk0jh\.j%  
 ON_WM_QUERYDRAGICON() ao4"=My*G  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) dGxk ql  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )tH.P: 1~,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) J~=bW\^I  
//}}AFX_MSG_MAP +_.k\CRms  
END_MESSAGE_MAP() :}QBrd  
4CO"> :  
BOOL CCaptureDlg::OnInitDialog() _lWC)bv`  
{ [E9V#J89  
 CDialog::OnInitDialog(); v'R{lXE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); m5!~PG:_  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^/nj2"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^*CvKCS  
 if (pSysMenu != NULL) DuESLMhz  
 { iFJ2dFA  
  CString strAboutMenu; pkW }\r  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3V)ef$Y0  
  if (!strAboutMenu.IsEmpty()) 8nt3S m  
  { #nK38W#  
   pSysMenu->AppendMenu(MF_SEPARATOR); l(c2 B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lSMv9 :N  
  } bve_*7CEM  
 } {FYWQ!L  
 SetIcon(m_hIcon, TRUE); // Set big icon ;E Z5/"T  
 SetIcon(m_hIcon, FALSE); // Set small icon N$\'X<{  
 m_Key.SetCurSel(0); eWKFs)C]  
 RegisterHotkey(); p~Tp=d)/  
 CMenu* pMenu=GetSystemMenu(FALSE); glMYEGz6p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jZjWz1+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o!R.QI^2VT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,g69?w  
 return TRUE; // return TRUE unless you set the focus to a control B3x4sK s  
} t=,ZR}M1`  
b3/@$x<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #@ClhpLD  
{ ]><K8N3Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) oRf.34  
 { cyM9[X4rC  
  CAboutDlg dlgAbout; eUBf-xA  
  dlgAbout.DoModal(); %bu$t,  
 } C%2BDj  
 else _?]0b7X  
 { ~lBb%M  
  CDialog::OnSysCommand(nID, lParam); 6Zr_W#SE  
 } OQlmzg  
} u|;?FQ$M  
VI xGD#m  
void CCaptureDlg::OnPaint() [&_7w\m  
{ RIhu9W   
 if (IsIconic()) JD`IPQb~E  
 { Q6Ay$*y=D  
  CPaintDC dc(this); // device context for painting {6*$yLWK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \,UpFuU\  
  // Center icon in client rectangle {Ad4H[]|]  
  int cxIcon = GetSystemMetrics(SM_CXICON); gmdJ8$  
  int cyIcon = GetSystemMetrics(SM_CYICON); pUc N-WA  
  CRect rect; BiFU3FlTf  
  GetClientRect(&rect); s ;3k#-w  
  int x = (rect.Width() - cxIcon + 1) / 2; ?*oBevUnCY  
  int y = (rect.Height() - cyIcon + 1) / 2; 6tx5{Xl-o  
  // Draw the icon 4*AkUkP:T  
  dc.DrawIcon(x, y, m_hIcon); NO)Hi)$X6Y  
 } ]=gNA  
 else tTjadnX  
 { fwF&V^Dy  
  CDialog::OnPaint(); Mh =yIx</  
 } -yP|CZM  
} ~Q+E""  
;;4>vF#*  
HCURSOR CCaptureDlg::OnQueryDragIcon() m|') A  
{ O/XG}G.x|  
 return (HCURSOR) m_hIcon; CF,-l B  
} #mIgk'kW<  
#EG W76 f  
void CCaptureDlg::OnCancel() dd+hX$,  
{ H{)DI(,Y^P  
 if(bTray) l|kGp~  
  DeleteIcon(); ftb .CPWI  
  CDialog::OnCancel(); &i(\g7%U  
} 8"'Z0 Ey  
xK*G'3Ge  
void CCaptureDlg::OnAbout() D(;jv="/  
{ X-,mNv z  
 CAboutDlg dlg; \m xi8Z w  
 dlg.DoModal(); 7 @W}>gnf  
} Io;x~i09K  
< )qJI'u|  
void CCaptureDlg::OnBrowse() ?&`PN<~2z  
{ Ad}Nc"O  
 CString str; ]|xfKDu  
 BROWSEINFO bi; AjYvYMA&  
 char name[MAX_PATH]; `{oFdvL~)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5cUz^ >  
 bi.hwndOwner=GetSafeHwnd(); ; b`kN;s  
 bi.pszDisplayName=name; e,?qwZK:y  
 bi.lpszTitle="Select folder"; MdC}!&W  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `i `F$;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +=Y[RCXT  
 if(idl==NULL) l cX'n8/3  
  return; >;K!yI?0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "Wb>y*S   
 str.ReleaseBuffer(); Q4Zw<IZv5  
 m_Path=str; H2jF=U"=  
 if(str.GetAt(str.GetLength()-1)!='\\') im-XP@<  
  m_Path+="\\"; _:1s7EC  
 UpdateData(FALSE); /;X+<Wj  
} 1 u~Xk?  
)KdEl9o  
void CCaptureDlg::SaveBmp() L eu93f2  
{ &cpqn2Z  
 CDC dc; -=InGm\Y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 20,}T)}Tm  
 CBitmap bm; \H4$9lPk  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1CR)1H  
 int Height=GetSystemMetrics(SM_CYSCREEN); F"^/R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f-BPT2U+  
 CDC tdc; T;M4NGmvd  
 tdc.CreateCompatibleDC(&dc); TFZxk  
 CBitmap*pOld=tdc.SelectObject(&bm); gWIb"l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Im!fZ g  
 tdc.SelectObject(pOld); D[ v2#2  
 BITMAP btm; J1u&Ga  
 bm.GetBitmap(&btm); o)L)|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; uPVO!`N3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0{'m":D9  
 BITMAPINFOHEADER bih; z.T>=C  
 bih.biBitCount=btm.bmBitsPixel; 0sP*ChY5S  
 bih.biClrImportant=0; N|2PW ~,  
 bih.biClrUsed=0; &5y|Q?  
 bih.biCompression=0;  rY CIU  
 bih.biHeight=btm.bmHeight; `'E(L&  
 bih.biPlanes=1; fzJ^`  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0: Nw8J  
 bih.biSizeImage=size; @@z5v bs'{  
 bih.biWidth=btm.bmWidth; &?H`MCv t  
 bih.biXPelsPerMeter=0; adtgNwg  
 bih.biYPelsPerMeter=0; %BwvA_T'Q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); M,vCAZ  
 static int filecount=0; ZK4d;oa",  
 CString name; 7P bwCRg  
 name.Format("pict%04d.bmp",filecount++); TtWWq5X|  
 name=m_Path+name; >sGiDK @  
 BITMAPFILEHEADER bfh; "rnVPHnQR  
 bfh.bfReserved1=bfh.bfReserved2=0; W|L#Q/ RX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !!<H*9]+W;  
 bfh.bfSize=54+size; ,UNnz&H+f  
 bfh.bfOffBits=54; !y&<IT(\4  
 CFile bf; ++!'6! l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0i>>CvAl}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <xlyk/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Tl L,dPM  
  bf.WriteHuge(lpData,size); LlcH#L$  
  bf.Close(); $ vBFs]h  
  nCount++; tx$`1KA  
 } b?j\YX[e  
 GlobalFreePtr(lpData); bo-lT-I  
 if(nCount==1) |Sv}/ P-  
  m_Number.Format("%d picture captured.",nCount); `hDH7u!U.  
 else #2dH2k\F  
  m_Number.Format("%d pictures captured.",nCount); (&1 56 5  
  UpdateData(FALSE); 6(/*E=bOKV  
} K*P:FCz  
)@],0yL  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) f<;eNN  
{ >{{0odBF  
 if(pMsg -> message == WM_KEYDOWN) !8I80 :e_~  
 { !>?*gc.<  
  if(pMsg -> wParam == VK_ESCAPE) ";Q}Gs}  
   return TRUE; 4vi [hiV   
  if(pMsg -> wParam == VK_RETURN) !}hG|Y6s  
   return TRUE; 0"l`M5-KP  
 } +' SG$<Xv  
 return CDialog::PreTranslateMessage(pMsg); &<EixDi4q  
} &&7&/   
07G'"=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r<[G~n  
{ )C$pjjo/`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l^2m7 7)  
  SaveBmp(); w7~cY=  
  return FALSE; 'F^1)Ga$  
} =C- b#4Q  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0D/7X9xg9+  
 CMenu pop; g~XR#vl$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |qf ef &  
 CMenu*pMenu=pop.GetSubMenu(0); ?&D.b$  
 pMenu->SetDefaultItem(ID_EXITICON); +ZR>ul-c  
 CPoint pt; ojx2[a\  
 GetCursorPos(&pt); 7.tIf <^$P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;+*/YTkC+P  
 if(id==ID_EXITICON) 9vBW CCf  
  DeleteIcon(); ,7)z avA  
 else if(id==ID_EXIT) Ud_0{%@  
  OnCancel(); xk7VuS *  
 return FALSE; \;1nEjIA  
} jt0f*e YE8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?(Xy 2%v  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) HHL7z,%f  
 AddIcon(); eyy%2> b  
 return res; L\q-Z..  
} y$9XHubu  
yeLd,M/I  
void CCaptureDlg::AddIcon() S;tvt/\!Z  
{ _FkH;MGWS  
 NOTIFYICONDATA data; IM_SZs  
 data.cbSize=sizeof(NOTIFYICONDATA); \F14]`i  
 CString tip; Y/f8rN  
 tip.LoadString(IDS_ICONTIP); $ncP#6  
 data.hIcon=GetIcon(0); XrJLlH>R4  
 data.hWnd=GetSafeHwnd(); ) 3ZkKv;zY  
 strcpy(data.szTip,tip); a28`)17z  
 data.uCallbackMessage=IDM_SHELL; [&)*jc16  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; QTU$mC]  
 data.uID=98; 8{)N%r  
 Shell_NotifyIcon(NIM_ADD,&data); ;P^}2i[q>[  
 ShowWindow(SW_HIDE); -YS9u [   
 bTray=TRUE; :464~tHI[`  
} 1]"S?  
Nk<H=kw+  
void CCaptureDlg::DeleteIcon() -PaR&0Tt  
{ ;pqS|ayl  
 NOTIFYICONDATA data; v?l*jr1-2  
 data.cbSize=sizeof(NOTIFYICONDATA); GQYB2{e>  
 data.hWnd=GetSafeHwnd(); w& )ApfL  
 data.uID=98; i^)JxEPr w  
 Shell_NotifyIcon(NIM_DELETE,&data); KB$Y8[  
 ShowWindow(SW_SHOW); Qp-P[Tc  
 SetForegroundWindow(); ,"5xKF+cS  
 ShowWindow(SW_SHOWNORMAL); ,U>G$G^  
 bTray=FALSE; \=H+m%  
} 7 iQa)8,  
U:gvK 8n  
void CCaptureDlg::OnChange() aZmac'cz{  
{ VDlP,Mm*  
 RegisterHotkey(); F1/BtGvQE  
} QwLSL<.  
eC_i]q&o|  
BOOL CCaptureDlg::RegisterHotkey() cA~bH 6  
{ FAq9G-\B  
 UpdateData(); 2+yti,s+/  
 UCHAR mask=0; :Aj[#4-=   
 UCHAR key=0; f.:0T&%G  
 if(m_bControl) !.7m4mKzo  
  mask|=4; \"P$*y4Le  
 if(m_bAlt) :ay`Id_tm  
  mask|=2; =00 sB  
 if(m_bShift) _Nf%x1m5s  
  mask|=1; =(Y+u  
  key=Key_Table[m_Key.GetCurSel()]; C|RC9b  
 if(bRegistered){ cXNR<`   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mcWN.  
  bRegistered=FALSE; b@B\2BT  
 } |AS9^w  
 cMask=mask; OpmPw4?}  
 cKey=key; OG^#e+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K<v:RbU|[1  
 return bRegistered; T+>W(w i  
} @Py?.H   
w}U'>fj  
  四、小结 cRSgP{hy  
%F(lq*8X  
  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:
3+5=?,请输入中文答案:八 正确答案:八