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
  • 6286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: nq8XVT.m^\  
  d&raHF*  
  一、实现方法 )E*f30  
yF? O+9R A  
  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: 8FMxn{k2  
m*A b<$y  
#pragma data_seg("shareddata") \X _}\_c,d  
HHOOK hHook =NULL; //钩子句柄 -0#"<!N  
UINT nHookCount =0; //挂接的程序数目 s_XCKhN:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 t(6]j#5   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d"06 gp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +pwTM]bV  
static int KeyCount =0; \t&! &R#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =eUKpYI  
#pragma data_seg() |+W{c`KL  
C@eL9R;N1  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 -^2p@^  
WoN},oT[i  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: nPdkvs   
?'+]d;UO&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 2HmK['(  
cKey,UCHAR cMask) z$R&u=J  
{ F:T(-,  
 BOOL bAdded=FALSE; =VzJ>!0  
 for(int index=0;index<MAX_KEY;index++){ pxgf%P<7  
  if(hCallWnd[index]==0){ 2A; i  
   hCallWnd[index]=hWnd; 'g)f5n a[  
   HotKey[index]=cKey; PL{lYexJ  
   HotKeyMask[index]=cMask; ?D _4KFr  
   bAdded=TRUE; :rQDA =Ps  
   KeyCount++; 3 0[Xkz  
   break; oSD=3DQ;  
  } Lw,}wM5X  
 } {l,&F+W$C  
 return bAdded; T&dNjx  
} EQ,`6UT>  
//删除热键 H\oxj,+N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]jxyaE&%4  
{ jH9PD8D\  
 BOOL bRemoved=FALSE; @i!+Z  
 for(int index=0;index<MAX_KEY;index++){ <Y7j'n  
  if(hCallWnd[index]==hWnd){ /~u^@@.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @3KSoA"^  
    hCallWnd[index]=NULL; )VkVZf | S  
    HotKey[index]=0; klnNBo!  
    HotKeyMask[index]=0;  94PI  
    bRemoved=TRUE; 9)v]jk  
    KeyCount--; v)_c*+6u  
    break; .O1w-,=  
   } GqL&hbpi  
  } 5@%Gq)z5  
 } `aAE4Ry?  
 return bRemoved; Zt! $"N.,  
} e8("G[P >  
Z,2?TT|p  
@[9  
  DLL中的钩子函数如下: 'RKpMdoz  
,]wQ]fpt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xaVX@ 3r.3  
{ Kt*fQ `9  
 BOOL bProcessed=FALSE; aC2Vz9e  
 if(HC_ACTION==nCode) Yc]k<tQ  
 { 4)tY6ds)r|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Jw}t~m3  
   switch(wParam) S1^/W-yoc~  
   {  _]o7iqtv  
    case VK_MENU: iXo; e  
     MaskBits&=~ALTBIT; f|B\Y/*X  
     break; Xydx87L/-e  
    case VK_CONTROL: /!5ohQlPJ  
     MaskBits&=~CTRLBIT; i*N2@Z[  
     break; ]rj~3du\  
    case VK_SHIFT: RNw#s R  
     MaskBits&=~SHIFTBIT; - @>]iBl  
     break; |e@1@q(a[]  
    default: //judge the key and send message XLpn3sX$  
     break; siCi+Y  
   } *uRDB9#9,  
   for(int index=0;index<MAX_KEY;index++){ E*5aLT5!,  
    if(hCallWnd[index]==NULL) #M!$CGi (  
     continue; ^-PYP:*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'XKfKv >;  
    { A"M;kzAfHM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _0rt.NRD  
     bProcessed=TRUE; qzxWv5UH  
    } ? bWc<]  
   } k8}fKVU;  
  } /ojwOJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 a. D cmy{  
   switch(wParam) s3JzYDpy  
   { !`=iKe&%E  
    case VK_MENU: A'jL+dI.  
     MaskBits|=ALTBIT; Q" h]p  
     break; mv:@D  
    case VK_CONTROL: u-iQ  
     MaskBits|=CTRLBIT; \Qah*1  
     break; jm<^WQ%Cc  
    case VK_SHIFT: Ry X11XU  
     MaskBits|=SHIFTBIT; *(yw6(9%  
     break; ;hq_}.  
    default: //judge the key and send message ? 3fnt"  
     break; N7"cMAs\G  
   } 2Xv}JPS2As  
   for(int index=0;index<MAX_KEY;index++){ }rmr0Bh  
    if(hCallWnd[index]==NULL) Dz~^AuD6  
     continue; S;Sy.Lp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l H_pG~  
    { Cj~e` VRhk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W895@  
     bProcessed=TRUE; >Vq07R  
    } /'DAB**  
   } 4uO88[=  
  } xM<aQf\j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 OCdX'HN5Y  
   for(int index=0;index<MAX_KEY;index++){ 3n7>qZ.d  
    if(hCallWnd[index]==NULL) 0AWxU?$A4  
     continue; "B__a(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H?r~% bh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sYXLVJ>b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tE-bHu370  
   } ]#shuZ##>0  
  } \ky oA Z  
 } OjffN'a+N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -:_3N2U=+  
} /PaS <"<P@  
a U.3  
  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: J3aom,$o  
}KUK|p5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /V+7:WDj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g/$RuT2U  
G L0P&$h  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: \bF<f02P  
R$u1\r1I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3; z1Hp2X  
{ ? }ff O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) m=h/A xW  
 { !sI^Lh,Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 P*;[&Nn4  
  SaveBmp(); 9wfE^E1  
  return FALSE; ?Mo)&,__  
 } F# 9^RA)9  
 …… //其它处理及默认处理 ZGh6- /  
} <n k/w5nKL  
#o~C0`8!B=  
J( ]b1e  
  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。 v\9f 8|K  
*\:sHVyG(  
  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。 a6h+?Q7uF  
t 4M-;y  
  二、编程步骤 a6 :hH@,  
,tZL"  
  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"; EY)?hJS,  
"+O/OKfR0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HI:1Voy  
GK6~~ga=  
  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; *7*cWO=  
*=O3kUoL  
  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; UnVa`@P^:G  
>u0XV"g$  
  5、 添加代码,编译运行程序。 4yTgH0(T  
\goiW;b  
三、程序代码 Zonn  
d7X7_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL mg._c  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QaE!?R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (8ct'Q;  
#if _MSC_VER > 1000 )J yB  
#pragma once LrdED[Z  
#endif // _MSC_VER > 1000 >U\P^yU  
#ifndef __AFXWIN_H__ ]T5\LNyN  
#error include 'stdafx.h' before including this file for PCH |DsT $ ~D  
#endif By[M|4a  
#include "resource.h" // main symbols 5(1c?biP&  
class CHookApp : public CWinApp eFy {VpO+  
{ >*B59+1P  
 public: -e"kJd&V  
  CHookApp(); xp^Jp  
  // Overrides GHi'ek<?^  
  // ClassWizard generated virtual function overrides @+Nf@LJ  
  //{{AFX_VIRTUAL(CHookApp) VL"Cxs  
 public: M;AvOk|&  
  virtual BOOL InitInstance(); pIpdVKen  
  virtual int ExitInstance(); M|@@ LJ'  
  //}}AFX_VIRTUAL m%;LJ~R  
  //{{AFX_MSG(CHookApp) -~J5aG[@~>  
  // NOTE - the ClassWizard will add and remove member functions here. 3TV4|&W;  
  // DO NOT EDIT what you see in these blocks of generated code ! * _usVg  
  //}}AFX_MSG x<w-j[{k_K  
  DECLARE_MESSAGE_MAP() 6e.l# c!1}  
}; l*CCnqE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); h{\S'8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ($UUgjv F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >^,?0HP  
BOOL InitHotkey(); "Il) _Ui  
BOOL UnInit(); i;qij[W.z  
#endif q!><:"#[G  
5mL4Zq"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *(wxNsK  
#include "stdafx.h" dqgr98  
#include "hook.h" &+hk5?c /  
#include <windowsx.h> fpO2bD%$8  
#ifdef _DEBUG l  LBzY`j  
#define new DEBUG_NEW G|t0no\f  
#undef THIS_FILE H<nA*Zf2@R  
static char THIS_FILE[] = __FILE__; XN\rq=  
#endif 23ho uS   
#define MAX_KEY 100 spQr1hx<  
#define CTRLBIT 0x04 ^)`e}}  
#define ALTBIT 0x02 2"}Vfy  
#define SHIFTBIT 0x01 Ed_Fx'  
#pragma data_seg("shareddata") 5~[][VV^  
HHOOK hHook =NULL; [T [] U   
UINT nHookCount =0; >@a7Zzl0H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey F_/ra?WVH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @x[A ^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey k %sxA  
static int KeyCount =0; \j.l1O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T.%yeJiE  
#pragma data_seg() JXt_  
HINSTANCE hins; Ck m:;q  
void VerifyWindow(); f\RTO63|O  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "?iyvzo  
//{{AFX_MSG_MAP(CHookApp) )@tHS-Jf  
// NOTE - the ClassWizard will add and remove mapping macros here. -~_|ZnuM9  
// DO NOT EDIT what you see in these blocks of generated code! 96; gzG@1!  
//}}AFX_MSG_MAP IQd~` G  
END_MESSAGE_MAP() r1=j$G  
b8%TwYp  
CHookApp::CHookApp() #l9sQ-1Q  
{ &(p5z4Df  
 // TODO: add construction code here, `q  | )_  
 // Place all significant initialization in InitInstance hc9 ON&L\>  
} 4OAR ["f  
O^ &m  
CHookApp theApp; 3-Xd9ou  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BT3yrq9  
{ "|,KXv')  
 BOOL bProcessed=FALSE; ~GJ;;v1b2  
 if(HC_ACTION==nCode) /74h+.amg  
 { ru1^. (W2  
  if((lParam&0xc0000000)==0xc0000000){// Key up f1U8 b*F<  
   switch(wParam) v7hw%9(=  
   { nC?Lz1re  
    case VK_MENU: VT~%);.#  
     MaskBits&=~ALTBIT; (KPD`l8.  
     break; oSYbx:2wo  
    case VK_CONTROL: 68<W6z  
     MaskBits&=~CTRLBIT; _sL;E<)y(  
     break; U(OkTJxv+  
    case VK_SHIFT: 7@k3-?q  
     MaskBits&=~SHIFTBIT; G-:7,9  
     break; Qs#;sy W@~  
    default: //judge the key and send message n`jG[{3t&  
     break; 6T_Ya)  
   } .SSyW{a3w  
   for(int index=0;index<MAX_KEY;index++){ |]Hr"saO0  
    if(hCallWnd[index]==NULL) ug"4P.wI  
     continue; )7#3n(_np  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kaIns  
    { \PG_i'R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X Vo+ <&  
     bProcessed=TRUE; 2\#$::B9  
    } (4C)] RHQ  
   } 0 xvSi9  
  } bJ6H6D>  
  else if((lParam&0xc000ffff)==1){ //Key down ,R7j9#D  
   switch(wParam) Fo~q35uB  
   { 4L97UhLL  
    case VK_MENU: F~OQ'59!Pf  
     MaskBits|=ALTBIT;  <pD  
     break; ?s)6 YF  
    case VK_CONTROL: V|awbff:  
     MaskBits|=CTRLBIT; Tks1gN^^  
     break; -H|!KnR  
    case VK_SHIFT: YV>&v.x0;  
     MaskBits|=SHIFTBIT; W+4Bx=Mj  
     break; (Gapv9R  
    default: //judge the key and send message @LS%uqs  
     break; [a~@6*=  
   } 3Q7PY46  
   for(int index=0;index<MAX_KEY;index++) q@ wX=  
   { kK:Wr&X0H  
    if(hCallWnd[index]==NULL) E7w^A  
     continue; . _Jypk8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F8/n;  
    { Qs8yJH`v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g 4 $  
     bProcessed=TRUE; O9ro{ k  
    } Pj BBXI1i  
   } Znh;#%n|  
  } Y9st3  
  if(!bProcessed){ yWT1CID  
   for(int index=0;index<MAX_KEY;index++){ CC$rt2\e  
    if(hCallWnd[index]==NULL) F/:%YR;  
     continue; ~xws5n}F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )U]q{0`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :DuEv:;v  
   } ;/IX w>O(/  
  } VuK>lY &  
 } 0r!F]Rm-^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p`52  
} ~[BGKq h  
PB BJ.!Pb  
BOOL InitHotkey() '[_.mx|cd`  
{ FBzsM7]j  
 if(hHook!=NULL){ a6It1%a+  
  nHookCount++; MFWkJbZV  
  return TRUE; k!WeE#"(  
 } 2$o\`^dy  
 else x>A[~s"|N  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "kIlxf3  
  if(hHook!=NULL) a`eb9o#  
   nHookCount++; {Dy,u%W?  
  return (hHook!=NULL); N\?__WlBK7  
} 0Xn,q]@Z  
BOOL UnInit() pDhUD}1G  
{ ^bdXzjf  
 if(nHookCount>1){ N{M25ucAHl  
  nHookCount--; dAOJ: @y  
  return TRUE; 3e\IRF xzb  
 } ^\yz`b(A0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?T|0"|\"'  
 if(unhooked==TRUE){ EyBTja(4  
  nHookCount=0; /{I-gjovy  
  hHook=NULL; + kF%>F]  
 } cw0uLMqr`  
 return unhooked; DC_k0VBn  
} :TV`uUE  
LA/Qm/T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :vaVghN\  
{ Wu8zK=Ve(  
 BOOL bAdded=FALSE; ^.~e  
 for(int index=0;index<MAX_KEY;index++){ Jv]$@>#  
  if(hCallWnd[index]==0){ wqzpFPk(  
   hCallWnd[index]=hWnd; 6UqDpL7^U  
   HotKey[index]=cKey; 13Q87i5B  
   HotKeyMask[index]=cMask; Q0ba;KPm  
   bAdded=TRUE; X_,R!$wbg:  
   KeyCount++; (FGH t/!  
   break; V <ilv<  
  } xv%]g= Q  
 } iYlkc  
 return bAdded; W}%[i+  
} 6%wlz%Fp  
"t-9q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W!+=`[Ff  
{ ;Uy}(  
 BOOL bRemoved=FALSE; r-]%R:U*  
 for(int index=0;index<MAX_KEY;index++){ w:=:D=xH2  
  if(hCallWnd[index]==hWnd){ ~Ra8(KocD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :wUi&xw  
    hCallWnd[index]=NULL; 8 ~Pdr]5  
    HotKey[index]=0; D$TpT X\  
    HotKeyMask[index]=0; O+=}x]q*y  
    bRemoved=TRUE; z('t#J!b  
    KeyCount--; |~rKDc  
    break; {yd(n_PqY  
   } qc' ;<  
  } HTm`_}G9  
 } >8$Lqj^i  
 return bRemoved; ::cI4D  
} L{&Yh|}  
>>8{N)c5E  
void VerifyWindow() ?<Mx*l  
{ nm %7e!{m  
 for(int i=0;i<MAX_KEY;i++){ Re*~C:  
  if(hCallWnd!=NULL){ \,lIPA/L  
   if(!IsWindow(hCallWnd)){ ;(K"w*  
    hCallWnd=NULL; ,<s:* k  
    HotKey=0; e :T9f('  
    HotKeyMask=0; GSfU*@L3  
    KeyCount--; >CHb;*U  
   } T?tZ?!6  
  } jTW8mWNk]  
 } _({wJ$aYC  
} # 00?]6`z  
gplrJaH@  
BOOL CHookApp::InitInstance() i#*lK7  
{ 7[0CVWs,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); nXjSf  
 hins=AfxGetInstanceHandle(); }n"gX>e~  
 InitHotkey(); BhiOV_}Hn  
 return CWinApp::InitInstance(); :" JEC'  
} PM&NY8|Zy  
QpS7 nGev  
int CHookApp::ExitInstance() jI<_(T  
{ {*<%6?  
 VerifyWindow(); 82o|(pw  
 UnInit(); :H:+XIgoR  
 return CWinApp::ExitInstance(); -e0?1.A$  
} WKwYSbs(  
vw-y:,5`t8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h&~9?B  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2~V"[26t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \zOsq5}  
#if _MSC_VER > 1000 k(@W z>aCv  
#pragma once ]a[2QQ+g  
#endif // _MSC_VER > 1000 :0bjPQj  
P=s3&NDD  
class CCaptureDlg : public CDialog 4`Jf_C  
{ J]Rh+@r.  
 // Construction ZQ-6n1O  
 public: m SO7r F  
  BOOL bTray; sG^{ cn  
  BOOL bRegistered; .;(a;f+{;  
  BOOL RegisterHotkey(); 19%zcYTe  
  UCHAR cKey; C3 BoH&  
  UCHAR cMask; d vo|9 >  
  void DeleteIcon(); JcfGe4  
  void AddIcon(); ZzP&Zrm  
  UINT nCount; oqg +<m  
  void SaveBmp(); ^)aj, U[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _'n]rQ'  
  // Dialog Data 9XUk.Nek  
  //{{AFX_DATA(CCaptureDlg) b%0@nu4  
  enum { IDD = IDD_CAPTURE_DIALOG }; b7gN|Hw5 H  
  CComboBox m_Key; b.9[Vf_G  
  BOOL m_bControl; HJd{j,M  
  BOOL m_bAlt; xP27j_*m>  
  BOOL m_bShift; $-s8tc(  
  CString m_Path;  w U1[/  
  CString m_Number; XK;Vu#E*^  
  //}}AFX_DATA Mh{;1$j#  
  // ClassWizard generated virtual function overrides +k/=L9#e  
  //{{AFX_VIRTUAL(CCaptureDlg) "EE (O9q  
 public: 31QDN0o!~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <vb7X  
 protected: uWP0(6 %  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >ZU)bnndA  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [<d_#(]h'  
  //}}AFX_VIRTUAL +G,_|C2J  
  // Implementation Y)#,6\=U  
 protected: a :cfr*IsK  
  HICON m_hIcon; YtXd>@7  
  // Generated message map functions *&V"x=ba,  
  //{{AFX_MSG(CCaptureDlg) cyh ;1Q  
  virtual BOOL OnInitDialog(); Z&7Yl(|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !Fs<r)j  
  afx_msg void OnPaint(); ,8cVv->u/  
  afx_msg HCURSOR OnQueryDragIcon(); jzwHb'4B3  
  virtual void OnCancel(); aN!,\D  
  afx_msg void OnAbout(); ,kl``w|1M  
  afx_msg void OnBrowse(); 0oqOX  
  afx_msg void OnChange(); vJsg6oH  
 //}}AFX_MSG 7$8DMBqq  
 DECLARE_MESSAGE_MAP() -M4VC^_  
}; =-qYp0sVP  
#endif $if(n||  
rX)_!mR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file y'z9Ya  
#include "stdafx.h" Jid_&\  
#include "Capture.h" D u_ ;!E  
#include "CaptureDlg.h" D z[ ,;  
#include <windowsx.h> \6pQ&an  
#pragma comment(lib,"hook.lib") 0_=^#r4Mu  
#ifdef _DEBUG Kk|)N3AV:  
#define new DEBUG_NEW 8N3rYx;d~  
#undef THIS_FILE -MORd{GF  
static char THIS_FILE[] = __FILE__; Xo6zeLHO  
#endif st>%U9  
#define IDM_SHELL WM_USER+1 i@ 86Ez  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BL-7r=Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m6Qm }""  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m\_v{1g  
class CAboutDlg : public CDialog ME.!l6lm\  
{ p4 $4;)  
 public: .&h|r>*|J  
  CAboutDlg(); ll?Qg%V[t  
  // Dialog Data H|'n|\{lt  
  //{{AFX_DATA(CAboutDlg) $&i8/pD  
  enum { IDD = IDD_ABOUTBOX }; y(Em+YTD  
  //}}AFX_DATA ):n'B` f}z  
  // ClassWizard generated virtual function overrides u)%/df qzZ  
  //{{AFX_VIRTUAL(CAboutDlg) PtGFLM9R  
 protected: ^S(QvoaQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HHOqJb{8S  
  //}}AFX_VIRTUAL D4?cnwU  
  // Implementation 6zGeGW  
 protected: D}N4*L1  
  //{{AFX_MSG(CAboutDlg) F'@ 9kdp  
  //}}AFX_MSG sWi4+PAM0  
  DECLARE_MESSAGE_MAP() f?(g5o*2  
}; is^5TL%@  
4.>y[_vu  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7dOpJjv?)  
{ g\*2w @  
 //{{AFX_DATA_INIT(CAboutDlg) <<-BQ l~  
 //}}AFX_DATA_INIT &3itBQF  
} =p dLh  
474 oVdGx  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1k{H,p7  
{ l-SVI9|<0  
 CDialog::DoDataExchange(pDX); R''2o_F6  
 //{{AFX_DATA_MAP(CAboutDlg) Rhw+~gd*F  
 //}}AFX_DATA_MAP 7 4hRG~  
} 6t'.4SR  
-67!u;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /74)c~.W  
 //{{AFX_MSG_MAP(CAboutDlg) Gsz$H_  
 // No message handlers ]}.|b6\  
 //}}AFX_MSG_MAP ^Of\l:q*  
END_MESSAGE_MAP() g``S SU  
c4bvJy8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7Oi<_b  
: CDialog(CCaptureDlg::IDD, pParent) 7324#HwS  
{ 5JG`FRW!  
 //{{AFX_DATA_INIT(CCaptureDlg) om6`>I*  
  m_bControl = FALSE; Vygh|UEo  
  m_bAlt = FALSE; (aB:P03  
  m_bShift = FALSE; ( v$ i  
  m_Path = _T("c:\\"); Qz$Wp*  
  m_Number = _T("0 picture captured.");  TZdJq  
  nCount=0; !yz3:Yzu  
  bRegistered=FALSE; ?iL-2I3*  
  bTray=FALSE; EH'eyC-B<  
 //}}AFX_DATA_INIT ^__ P;Gr`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QJI]@3 Y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ('.I)n  
} 8[a N5M]  
Ft_g~]kZo  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) FR\r/+n:t0  
{ _j~y;R)  
 CDialog::DoDataExchange(pDX); !|cM<}TF,  
 //{{AFX_DATA_MAP(CCaptureDlg) :\%hv>}|  
  DDX_Control(pDX, IDC_KEY, m_Key); B|=S-5pv*  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Qh]k)]+*|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]|[mwC4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7(H?3)%0  
  DDX_Text(pDX, IDC_PATH, m_Path); SE$l,Z"[*b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6}*4co  
 //}}AFX_DATA_MAP 4%6@MQ[  
} 0;w84>M  
^C}f|{J  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) U?Vik  
//{{AFX_MSG_MAP(CCaptureDlg) ]UZP dw1D  
 ON_WM_SYSCOMMAND() ghk"XJ|  
 ON_WM_PAINT() }$ a *XY1  
 ON_WM_QUERYDRAGICON() r/QI-Cf&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) I}awembw g  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v(,YqT>q@U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {RD9j1  
//}}AFX_MSG_MAP f3<253 1/}  
END_MESSAGE_MAP() dx.Jv/Mb  
%mOQIXr1s  
BOOL CCaptureDlg::OnInitDialog() aED73:b  
{ Z'd]oNF  
 CDialog::OnInitDialog(); m=w #l>!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'a~F'FN$  
 ASSERT(IDM_ABOUTBOX < 0xF000); =~q$k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `Y, Rk  
 if (pSysMenu != NULL) NYR:dH]N~d  
 { r_o\72  
  CString strAboutMenu; X#X/P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); F#RtU :R  
  if (!strAboutMenu.IsEmpty()) qporH]J-E  
  { Ze?H  
   pSysMenu->AppendMenu(MF_SEPARATOR); }xgs]\^,73  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yXf+dMv  
  } j3[kG#  
 } G420o}q  
 SetIcon(m_hIcon, TRUE); // Set big icon Q=epUHFs  
 SetIcon(m_hIcon, FALSE); // Set small icon dSS Ai |}  
 m_Key.SetCurSel(0); nr&9\lG]G  
 RegisterHotkey(); W^eQ}A+Z  
 CMenu* pMenu=GetSystemMenu(FALSE); UAC"jy1D  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I1p{(fJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); E:P_CDSd]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "a<:fEsSE  
 return TRUE; // return TRUE unless you set the focus to a control C~M,N|m+^  
} qI[AsM+  
Io('kCOR;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) unr`.}A2>  
{ mlz|KI~\F;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) HrRw  
 { V\AF%=6}  
  CAboutDlg dlgAbout; Z0M|Bv9_  
  dlgAbout.DoModal(); fyq %-Tj  
 } .RbPO#(  
 else hKe ms3  
 { NQN?CBFQ  
  CDialog::OnSysCommand(nID, lParam); zGP@!R`_  
 } f2ck=3  
} 6-\M }xq?  
6dRvx;d  
void CCaptureDlg::OnPaint() OZe`>Q6  
{ - P4X@s_;  
 if (IsIconic()) 5&]a8p{  
 { ?VyiR40-Cx  
  CPaintDC dc(this); // device context for painting EEHTlqvR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $;)A:*e  
  // Center icon in client rectangle rt\.|Hr4s  
  int cxIcon = GetSystemMetrics(SM_CXICON); +0:]KG!Zs.  
  int cyIcon = GetSystemMetrics(SM_CYICON); c >xHaA:V  
  CRect rect; uao#=]?)  
  GetClientRect(&rect); =!($=9  
  int x = (rect.Width() - cxIcon + 1) / 2; {=+'3p  
  int y = (rect.Height() - cyIcon + 1) / 2; x(:alG%#  
  // Draw the icon Kw`}hSE>o  
  dc.DrawIcon(x, y, m_hIcon); ~Vc`AcWP  
 } :]8!G- Z  
 else 2HDWlUTNVO  
 { yz%o?%@  
  CDialog::OnPaint(); mC'<Ov<eJ  
 } v/,,z+%-  
} "[CR5q9Pr  
Q776cj^L  
HCURSOR CCaptureDlg::OnQueryDragIcon() &E-q(3-  
{ @680.+Kw  
 return (HCURSOR) m_hIcon; T~d_?UAw$  
} UvL=^*tm  
2hb>6Z;r]K  
void CCaptureDlg::OnCancel() D#d/?\2  
{ 6<YAoo  
 if(bTray) t]ID  
  DeleteIcon(); 0 l+Jq  
  CDialog::OnCancel(); !" @<!  
} S]gV!Q4%  
< WQ ~X<1D  
void CCaptureDlg::OnAbout() ?p>m ;Aq  
{ Wyb+K)Tg  
 CAboutDlg dlg; z#d*Odc  
 dlg.DoModal(); $WsyAUl  
} 3k:`7E.  
t24.u+O  
void CCaptureDlg::OnBrowse() %D`j3cEp@  
{ QF$s([  
 CString str; (?[%u0%_  
 BROWSEINFO bi; _I0=a@3  
 char name[MAX_PATH]; +rka 5ts  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); n -xCaq  
 bi.hwndOwner=GetSafeHwnd(); S|m|ulB  
 bi.pszDisplayName=name; P o\d!  
 bi.lpszTitle="Select folder"; V"KuwM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `F_R J.g*p  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Y 9BKd78Y  
 if(idl==NULL) +[[^W;<.l  
  return; R'^J#"[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); WA#y&  
 str.ReleaseBuffer(); zuJ@@\75  
 m_Path=str; m=60a@o]  
 if(str.GetAt(str.GetLength()-1)!='\\') g2YE^EKU~  
  m_Path+="\\"; 4UMOC_  
 UpdateData(FALSE); z7&m,:M  
} =RHIB1  
l(8@?t^;  
void CCaptureDlg::SaveBmp() Xj<xen(  
{ 4@M`BH`  
 CDC dc; 9dva]$^:*1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); }eSrJgF4M  
 CBitmap bm; :,.HJ[Vg&  
 int Width=GetSystemMetrics(SM_CXSCREEN); jEL"Q?#  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3s#/d,+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :b,An'H  
 CDC tdc; `KieN/d%  
 tdc.CreateCompatibleDC(&dc); s@*i  
 CBitmap*pOld=tdc.SelectObject(&bm); _CizU0S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); nd{k D>a  
 tdc.SelectObject(pOld); )k81  
 BITMAP btm; OZ&SxR%q4  
 bm.GetBitmap(&btm); .lGN Fx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; D4T(Dce  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w3"%d~/[x  
 BITMAPINFOHEADER bih; n9V8A[QJ  
 bih.biBitCount=btm.bmBitsPixel; 5e^z]j1Yv  
 bih.biClrImportant=0; 5a:YzQ4  
 bih.biClrUsed=0; 7s 0pH+  
 bih.biCompression=0; "7w=LhzV[$  
 bih.biHeight=btm.bmHeight; 'T]Ok\  
 bih.biPlanes=1; -gv[u,R  
 bih.biSize=sizeof(BITMAPINFOHEADER); N({-&A.N  
 bih.biSizeImage=size; `_OB_F  
 bih.biWidth=btm.bmWidth; 4XSq\.@G  
 bih.biXPelsPerMeter=0; eRg;)[#0>$  
 bih.biYPelsPerMeter=0; >j&k:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R+9 hog  
 static int filecount=0; k>:\4uI|<\  
 CString name; &x/Z {ut  
 name.Format("pict%04d.bmp",filecount++); ,E2c9V'  
 name=m_Path+name; so A] f  
 BITMAPFILEHEADER bfh; zG<>-?q~'  
 bfh.bfReserved1=bfh.bfReserved2=0; b6@0?_n  
 bfh.bfType=((WORD)('M'<< 8)|'B'); J>fq5  
 bfh.bfSize=54+size; CT (HTu  
 bfh.bfOffBits=54; Wli!s~c5Fo  
 CFile bf; m(CsO|pz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ N"zl7.E  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L8KaK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CUj$ <ay=  
  bf.WriteHuge(lpData,size); u|(Iu}sE=  
  bf.Close(); ogoEtKi  
  nCount++; J4?SC+\  
 } xj JoWB  
 GlobalFreePtr(lpData); +; =XiB5R  
 if(nCount==1) /$j,p E=  
  m_Number.Format("%d picture captured.",nCount); z h%b<  
 else fbkAu  
  m_Number.Format("%d pictures captured.",nCount); f 2k~(@!h  
  UpdateData(FALSE); .~|[* q\  
} ;bFd*8?;  
~l*[=0}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >P-'C^:V=  
{ )ZpMB  
 if(pMsg -> message == WM_KEYDOWN) uC2qP)m,^  
 { '~xiD?:  
  if(pMsg -> wParam == VK_ESCAPE) Sy^@v%P'A  
   return TRUE; kE1k@h#/  
  if(pMsg -> wParam == VK_RETURN) +[pJr-k  
   return TRUE; U:8cz=#  
 } "|/q4JN)7d  
 return CDialog::PreTranslateMessage(pMsg); /1.gv~`+  
} }+F@A`Bm&  
5Trc#i<\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Iz&<rL;s  
{ '<AE%i,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ aUKa+"`S  
  SaveBmp(); F/"lJ/I  
  return FALSE; 2]H?q!l!O  
} Xet} J@C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T^Hq 5Oy  
 CMenu pop; ?]>;Wr  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^%qQ)>I=j  
 CMenu*pMenu=pop.GetSubMenu(0); O)`ye5>v  
 pMenu->SetDefaultItem(ID_EXITICON); \4uj!LgTb  
 CPoint pt; P,k=u$  
 GetCursorPos(&pt); ngzQVaB9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); dDl_Pyg4K  
 if(id==ID_EXITICON) @`HW0Y_:  
  DeleteIcon(); U \jFB*U  
 else if(id==ID_EXIT) 0VIR =Pbp  
  OnCancel(); vSk1/  
 return FALSE; % xBQX  
} }1NNXxQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;s5JYR  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \3 O1o#=(  
 AddIcon(); ,N8SP 'R  
 return res; N^jr  
} ;B;wU.Y"  
R)%I9M,  
void CCaptureDlg::AddIcon() ~_ko$(;A  
{ && WEBQ  
 NOTIFYICONDATA data; S*H @`Do%d  
 data.cbSize=sizeof(NOTIFYICONDATA); \_/dfmlIZ  
 CString tip; MFqb_q+  
 tip.LoadString(IDS_ICONTIP); P} Y .  
 data.hIcon=GetIcon(0); 8[oZ>7LMzC  
 data.hWnd=GetSafeHwnd(); :PB W=W  
 strcpy(data.szTip,tip); m2Wi "X(I_  
 data.uCallbackMessage=IDM_SHELL; J?f7!F:8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B8zc#0!1  
 data.uID=98; ` bZgw  
 Shell_NotifyIcon(NIM_ADD,&data); ^C;ULUn3  
 ShowWindow(SW_HIDE); mEbj  
 bTray=TRUE; 'NDr$Qc3  
}  r^,"OM]  
#}[NleTVt  
void CCaptureDlg::DeleteIcon() KqXPxp^_Al  
{ Lo}zT-F  
 NOTIFYICONDATA data; iL'j9_w,  
 data.cbSize=sizeof(NOTIFYICONDATA); l^rQo_alk  
 data.hWnd=GetSafeHwnd(); ne=CN!=  
 data.uID=98; ]x6r P  
 Shell_NotifyIcon(NIM_DELETE,&data); =@MJEo`D  
 ShowWindow(SW_SHOW); iT</  
 SetForegroundWindow(); RIFTF R  
 ShowWindow(SW_SHOWNORMAL); LPkl16yZ  
 bTray=FALSE; |^gnT`+  
} MK <\:g  
P5v;o9B&  
void CCaptureDlg::OnChange() LVJn2t^  
{ ]vH:@%3U  
 RegisterHotkey(); &,$N|$yK}|  
} ra^"Vr  
%t]{C06w+{  
BOOL CCaptureDlg::RegisterHotkey() Z5[g[Q  
{ Ce} m_  
 UpdateData(); Uf~5Fc1d =  
 UCHAR mask=0; LB^xdMXi  
 UCHAR key=0; xn1, o MY=  
 if(m_bControl) {X-a6OQj  
  mask|=4; d/\ajQ1::  
 if(m_bAlt) !'>,37()  
  mask|=2; dHtEyF  
 if(m_bShift) +_ny{i`'  
  mask|=1; . $ HE  
  key=Key_Table[m_Key.GetCurSel()]; fD%20P`.  
 if(bRegistered){ 2j$~lI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Kr+#)S  
  bRegistered=FALSE; .L.9e#?3  
 } ?B<.d8i  
 cMask=mask; Myh?=:1~(c  
 cKey=key; f\H1$q\p\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -f"{%<Q  
 return bRegistered; /?*ut&hwv  
} &a'LOq+r'  
,vuC0{C^  
  四、小结 d1 lxz?r  
e /L([  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五