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用Visual C++实现屏幕抓图程序

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 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: 12a #]E  
  OKVYpf  
  一、实现方法 {+:XVT_+  
&>{>k<z  
  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: sdWl5 "  
:ct+.#  
#pragma data_seg("shareddata") \gkajY-?  
HHOOK hHook =NULL; //钩子句柄 dWy1=UQfP  
UINT nHookCount =0; //挂接的程序数目 Z]f2&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L'Zud,JKg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3c3Z"JV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^j %UZ  
static int KeyCount =0; nS4S[|w"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 q#`^EqtUF  
#pragma data_seg() f zO8by  
I={{VQ  
  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。 ArYF\7P  
];;w/$zke  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ([*t.  
W<VHv"?V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR g-FZel   
cKey,UCHAR cMask) T6$<o\g'  
{ cloI 6%5r  
 BOOL bAdded=FALSE; NO^t/(Z  
 for(int index=0;index<MAX_KEY;index++){ J"rwWIxO*  
  if(hCallWnd[index]==0){ <h=M Rw,l  
   hCallWnd[index]=hWnd; ?<'W~Rm6n  
   HotKey[index]=cKey; % eRwH >  
   HotKeyMask[index]=cMask; J36@Pf]h  
   bAdded=TRUE; S(i(1Hs.  
   KeyCount++; sV[Z|$&Z  
   break; Xb* _LZAU  
  } hhAC@EGG  
 } )uvFta<(  
 return bAdded; rj~ian  
} Mqp68%  
//删除热键 (dF;Gcw+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QJWES%m`  
{ ?w/nZQWi  
 BOOL bRemoved=FALSE; ; ZV^e  
 for(int index=0;index<MAX_KEY;index++){ acY[?L_6J  
  if(hCallWnd[index]==hWnd){ v:MS0]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2TEeP7  
    hCallWnd[index]=NULL; K)&XQ`&  
    HotKey[index]=0; "n }fEVJ,  
    HotKeyMask[index]=0; Q+(:n)G_6E  
    bRemoved=TRUE; /'6[*]IZP  
    KeyCount--; 9Fx z!-9m  
    break; Ko)T>8:  
   } T zYgH  
  } NB5B$q_'#  
 } ?]D+H%3[$i  
 return bRemoved; ;}~Bv<#  
} YwWTv  
So%1RY{ )  
G@EjWZQ  
  DLL中的钩子函数如下: J7;n;Mx  
V C'-h~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !a(qqZ|s  
{ V)QR!4De  
 BOOL bProcessed=FALSE; |~LjH|*M  
 if(HC_ACTION==nCode) KH>sCEt  
 { <S@mQJS!y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3dDQz#  
   switch(wParam) t0H=NUP8  
   {  P8,jA<W  
    case VK_MENU: , )pt_"-XA  
     MaskBits&=~ALTBIT; G>S1Ld'MV  
     break; _8pkejg  
    case VK_CONTROL: s*/ G- lY  
     MaskBits&=~CTRLBIT; `Mn{bd  
     break; NvHy'  
    case VK_SHIFT: 7TPLVa=hO  
     MaskBits&=~SHIFTBIT; a~>0JmM+N  
     break; 4*XP;`  
    default: //judge the key and send message ZX6=D>)u  
     break; q\ y#  
   } Y_3YO 2K]  
   for(int index=0;index<MAX_KEY;index++){ `[` *@O(y  
    if(hCallWnd[index]==NULL) A;j$rGx  
     continue; sFM>gG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n[:AV  
    { Q0uO49sg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YZ:'8<  
     bProcessed=TRUE; m\Fb ,  
    } 5`'au61/2  
   } ?Gv!d  
  } `) !2E6 =  
  else if((lParam&0xc000ffff)==1){ //有键按下 +6)kX4  
   switch(wParam) 9 roth  
   { j X!ftm2  
    case VK_MENU: UFAMbI  
     MaskBits|=ALTBIT; hPi :31-0  
     break; 0R5^p  
    case VK_CONTROL: X`v79`g_  
     MaskBits|=CTRLBIT; FlA\Ad;v  
     break; l)PFzIz=V  
    case VK_SHIFT: b, **$  
     MaskBits|=SHIFTBIT; CE7pg&dJ)i  
     break; 5A]LNA4i  
    default: //judge the key and send message `MYKXBM  
     break; `Y({#U  
   } HD8"=7zJk  
   for(int index=0;index<MAX_KEY;index++){ grfdvN  
    if(hCallWnd[index]==NULL) VDu .L8  
     continue; aU]O$Pg{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z=Y_;dS9  
    { q,,>:]f#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $s(4?^GP  
     bProcessed=TRUE; t"bPKFRy9E  
    } b}*@=X=4o  
   } I1 R\Ts@  
  } c;8"vJ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -f;j1bQ  
   for(int index=0;index<MAX_KEY;index++){ K-Dk2(x  
    if(hCallWnd[index]==NULL) sa gBmA~  
     continue; s?;<F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {{[jC"4AY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ic{.#R.BY  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &0 )xvZ  
   } -G<2R"Q#N  
  } )av'u.]%c  
 } IU'!?XVo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N" Jtg@w  
} iI@Gyq=  
am'p^Z @  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: `\4JwiPo  
Wh'_ slDH+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7~l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #nf%ojh  
vu'!-K=0  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: SL\y\G aV  
?ZuD _L-i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lF}$`6  
{ i h$@:^\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vPl6Das r  
 { WVT5VJ7*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $6&GAJe  
  SaveBmp(); K.iH  
  return FALSE; Yr"!&\[oz  
 } .M53, 8X  
 …… //其它处理及默认处理 &b@!DAwAJ  
} 9p\wTzA  
hA1gkEM2o  
{7![3`%7  
  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。 ?<yq 2`\4O  
peTO-x^a-  
  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。 n"<GJ.{  
jQ_|z@OV  
  二、编程步骤 4z0R\tjT  
w1"gl0ga$  
  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";  fBWJ%W  
5Du>-.r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hDD~,/yVxs  
y5AXL5  
  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; c2\rjK   
&t*8oNwSs  
  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; TH(Lzrbg  
Z*vpQBbu  
  5、 添加代码,编译运行程序。 l`M5'r]l  
d[>N6?JA/  
三、程序代码 {Z?$Co^R  
+.gf]|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL UU;-q_H6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f?>-yMR|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;oY(I7  
#if _MSC_VER > 1000 s7UhC.>'@  
#pragma once L`HH);Ozw  
#endif // _MSC_VER > 1000 BudWbZ5>Ep  
#ifndef __AFXWIN_H__ Fyh?4!/.  
#error include 'stdafx.h' before including this file for PCH T) Zt'M  
#endif yjOu]K:X  
#include "resource.h" // main symbols 1W}nYU  
class CHookApp : public CWinApp kh>SrW]B%  
{ '!yS72{$2  
 public: g@k#J"Q '[  
  CHookApp(); q(jkit~`A  
  // Overrides 6Bq~\b^  
  // ClassWizard generated virtual function overrides ?LV-W  
  //{{AFX_VIRTUAL(CHookApp) B::4Qme  
 public: LpiHoavv  
  virtual BOOL InitInstance(); x8pbO[_|  
  virtual int ExitInstance(); S`W'G&bCj  
  //}}AFX_VIRTUAL }W__ffH  
  //{{AFX_MSG(CHookApp) J2oWssw"  
  // NOTE - the ClassWizard will add and remove member functions here. 8=n9hLhqo  
  // DO NOT EDIT what you see in these blocks of generated code ! lZS_n9Sc  
  //}}AFX_MSG M8#*zCp{5  
  DECLARE_MESSAGE_MAP() !HdvCYB>  
}; j2 o1"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); n2jvXLJq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r{_B:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ax72ehL}  
BOOL InitHotkey(); ~_l6dDJ  
BOOL UnInit(); i!1ho T$  
#endif _\4`  
D8@n kSP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. EZ%w=  
#include "stdafx.h" *793H\  
#include "hook.h" ~<2 IIR$H  
#include <windowsx.h> hr_9;,EPh  
#ifdef _DEBUG ^8';8+$  
#define new DEBUG_NEW $IxU6=ajn  
#undef THIS_FILE #90[PASx  
static char THIS_FILE[] = __FILE__; mX<Fuu}E*Z  
#endif AK@`'$  
#define MAX_KEY 100 \ifK~?  
#define CTRLBIT 0x04 n2xLgK=  
#define ALTBIT 0x02 s.R-<Y 3  
#define SHIFTBIT 0x01 68koQgI[^  
#pragma data_seg("shareddata") |b$>68:  
HHOOK hHook =NULL; F}6DB*  
UINT nHookCount =0; }XGMa?WR  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Z{,GZT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cQ3W;F8|n  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0|fb< "  
static int KeyCount =0; n) _dH/"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift E(QZ!'%K+m  
#pragma data_seg() PJxak3  
HINSTANCE hins; Snc; p  
void VerifyWindow(); "*++55  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) .N~PHyXZR  
//{{AFX_MSG_MAP(CHookApp) .>mH]/]m  
// NOTE - the ClassWizard will add and remove mapping macros here. ]>R`;"(  
// DO NOT EDIT what you see in these blocks of generated code! AW,v  
//}}AFX_MSG_MAP V;h=8C5J  
END_MESSAGE_MAP() ,:#,}w_HyO  
qj~flw1:  
CHookApp::CHookApp() c;:">NR  
{ \)OZUch  
 // TODO: add construction code here, u*t,i`  
 // Place all significant initialization in InitInstance /9x{^  
} g$*/ XSr(  
_ztZ> '  
CHookApp theApp; ,op]-CY 5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  ]{f^;y8  
{ ==QWwPpA  
 BOOL bProcessed=FALSE; N$\ bg|v  
 if(HC_ACTION==nCode) YCa@R!M*O  
 { KQG-2oW  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7d&DrI@~  
   switch(wParam) 1R0ffP]  
   { r\$6'+Si  
    case VK_MENU: w)+wj[6 E  
     MaskBits&=~ALTBIT; A6Ghj{~  
     break; ?PBa'g  
    case VK_CONTROL: QGs1zfh*  
     MaskBits&=~CTRLBIT; uh]"(h(>  
     break; z$JX'(<Z7  
    case VK_SHIFT: S~KS9E~\  
     MaskBits&=~SHIFTBIT; a q3~!T;W  
     break; 3lo;^KX !  
    default: //judge the key and send message J|V K P7  
     break; X}ZlWJ  
   } ;B&^yj&;  
   for(int index=0;index<MAX_KEY;index++){ BjJ,"sT  
    if(hCallWnd[index]==NULL) c_ La^HS  
     continue; r55qmPhg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z;i4N3-:  
    { Fi mN?s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >_XOc  
     bProcessed=TRUE; *IC^IC:  
    } A_!QrM  
   } ')B =|T)  
  } >T<6fpXuk2  
  else if((lParam&0xc000ffff)==1){ //Key down >^a$  
   switch(wParam) YEzU{J  
   { 6cJ<9i &  
    case VK_MENU: H2_/,n  
     MaskBits|=ALTBIT; 0,HqE='w  
     break; JnfqXbE  
    case VK_CONTROL: 4-mVB wq  
     MaskBits|=CTRLBIT; >~_J q|KBB  
     break; 6+.>5e  
    case VK_SHIFT: a:85L!~:l  
     MaskBits|=SHIFTBIT; n.*3,4.]  
     break; PU W[e%  
    default: //judge the key and send message i+g~ Uj}h  
     break; ,V,f2W 4  
   } =I2@/,  
   for(int index=0;index<MAX_KEY;index++) 4SgF,ac3r  
   { nqT>qS[Z  
    if(hCallWnd[index]==NULL) RctU'T  
     continue; 6?N4l ]l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O|QUNr9  
    { X0`j-*,FX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m6^ 5S  
     bProcessed=TRUE; j&5G\6:  
    } >c<pDNt?  
   } ]*qU+&  
  } axmsrj W#  
  if(!bProcessed){ LheFQ A  
   for(int index=0;index<MAX_KEY;index++){ $.pTB(tO  
    if(hCallWnd[index]==NULL) ?WQNIX4  
     continue; $B\ H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1BJ<m5/1%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6B0# 4Qrv  
   } 2-~|Z=eGW  
  } F/>*If s  
 } nZfs=@w:y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vA=Z=8  
} yGxv?%%2  
ow$q7uf  
BOOL InitHotkey() kY"KD22a  
{ ]jyM@  
 if(hHook!=NULL){ @Br {!#Wf  
  nHookCount++; En(7(qP6}  
  return TRUE; .wmnnvtl,  
 } wd[eJcQ,  
 else a d9CsvW  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4WC9US-k  
  if(hHook!=NULL) C-m*?))go  
   nHookCount++; `5q ;ssu  
  return (hHook!=NULL); yEq#Dr  
} 5Fm av5  
BOOL UnInit() 8TE>IPjm  
{ {CtR+4KD  
 if(nHookCount>1){ d|XmasGN  
  nHookCount--; "xe=N  
  return TRUE; Mo D?2J  
 } v!9i"@<!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D8%AV; -Y  
 if(unhooked==TRUE){ qi(*ty  
  nHookCount=0; b7HffO O  
  hHook=NULL; MPIlSMe  
 } X8i(~ B  
 return unhooked; ySe$4deJ  
} w\Mnu}<e$  
er2cQS7R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .m;G$X|3U  
{ pXu/(&?  
 BOOL bAdded=FALSE; bUZ_UW  
 for(int index=0;index<MAX_KEY;index++){ `pL^}_>|GM  
  if(hCallWnd[index]==0){ Zp&@h-%YoD  
   hCallWnd[index]=hWnd; Tde0~j}  
   HotKey[index]=cKey; !lTda<;]  
   HotKeyMask[index]=cMask; ('C7=u&F  
   bAdded=TRUE; eS'yGY0b  
   KeyCount++; fKHE;A*>%  
   break; GaekFbW)  
  } t 9^A(Vh"-  
 } uLQ  
 return bAdded; cK@jmGj+  
} "B{ECM;  
0:=ZkEEeU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l>6@:nq|R  
{ x[(?#  
 BOOL bRemoved=FALSE; o31Nmy Ni  
 for(int index=0;index<MAX_KEY;index++){ `y^sITr  
  if(hCallWnd[index]==hWnd){ -F\qnsZ2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %0,-.(h  
    hCallWnd[index]=NULL; +oc >S  
    HotKey[index]=0; Wht(O~F  
    HotKeyMask[index]=0; 2;$ k(x]  
    bRemoved=TRUE; )JD(`  
    KeyCount--; ;`dh fcU  
    break; 4/e60jA  
   } egk7O4zwP  
  } -c%dvck^,  
 } uH@FU60  
 return bRemoved; f )Z%pgB  
} t<j^q`;@v  
amWD-0V  
void VerifyWindow() =IU*}>#  
{ \.uc06  
 for(int i=0;i<MAX_KEY;i++){ wQ+8\ s=  
  if(hCallWnd!=NULL){ Zg~nlO2  
   if(!IsWindow(hCallWnd)){ ]m4OIst  
    hCallWnd=NULL; 1L nyWZ  
    HotKey=0; dRi5hC$  
    HotKeyMask=0; ememce,Np  
    KeyCount--; ObG|o1b  
   } (`BSVxJH  
  } Q`%R[#  
 } T?Fcohz(  
} g(C|!}ex/  
|X19fgk  
BOOL CHookApp::InitInstance() k]A8% z  
{ 7.Kc:7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #A7jyg":  
 hins=AfxGetInstanceHandle(); 23!;}zHp  
 InitHotkey(); o|BP$P8V  
 return CWinApp::InitInstance(); MJ`3ta  
} kc `V4b%  
uC3:7  
int CHookApp::ExitInstance() O81X ;JdP3  
{ errH>D~  
 VerifyWindow(); o Y}]UB>  
 UnInit(); DZS]AC*  
 return CWinApp::ExitInstance(); BYrZEVM9  
} G oM ip8'u  
!y:%0{l  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @|}BXQNd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )E#2J$TD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =sJ _yq0#R  
#if _MSC_VER > 1000 [, RI-#n  
#pragma once 3REx45M2  
#endif // _MSC_VER > 1000 DQ#H,\ ^<  
H9)m^ *  
class CCaptureDlg : public CDialog  p?D2)(  
{ N==ZtKj F  
 // Construction &,\=3 '  
 public: V r(J+1@  
  BOOL bTray; ?~"bR%  
  BOOL bRegistered; <h).fX  
  BOOL RegisterHotkey(); PNOGN|D  
  UCHAR cKey; "\W-f  
  UCHAR cMask; =J-5.0Q\_\  
  void DeleteIcon(); ]uj=:@  
  void AddIcon(); kd`0E-QU  
  UINT nCount; D_mL,w  
  void SaveBmp(); 7?8wyk|x  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {5r0v#;  
  // Dialog Data >T2LEW  
  //{{AFX_DATA(CCaptureDlg) .d;Iht,[  
  enum { IDD = IDD_CAPTURE_DIALOG }; @ V08U!  
  CComboBox m_Key; 9Jf)!o8  
  BOOL m_bControl; i,A#&YDl  
  BOOL m_bAlt; 4/kv3rv  
  BOOL m_bShift; `1*nL,i  
  CString m_Path; u]NZ`t%AP  
  CString m_Number; =*qD4qYA  
  //}}AFX_DATA &6 s) X  
  // ClassWizard generated virtual function overrides `@d<n  
  //{{AFX_VIRTUAL(CCaptureDlg) 8$s9(n-_Y  
 public: j"^ +oxH  
  virtual BOOL PreTranslateMessage(MSG* pMsg); znJhP}(  
 protected: XqRJr%JH  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G+xt5n.%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &8&d3EQ  
  //}}AFX_VIRTUAL .:p2Tbo  
  // Implementation /+*#pDx/zW  
 protected: R[z`:1lo  
  HICON m_hIcon; FGO[ |]7IN  
  // Generated message map functions l0&EZN0V2  
  //{{AFX_MSG(CCaptureDlg) J:uW`R  
  virtual BOOL OnInitDialog(); DFhXx6]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); e^4 p%  
  afx_msg void OnPaint(); sDr/k`>  
  afx_msg HCURSOR OnQueryDragIcon(); =S'%`]f?  
  virtual void OnCancel(); YprH wL  
  afx_msg void OnAbout(); 5uq3\a  
  afx_msg void OnBrowse(); fO'Wj`&a  
  afx_msg void OnChange(); 0]QRsVz+  
 //}}AFX_MSG ETp%s{8  
 DECLARE_MESSAGE_MAP() y@2epY?{  
}; I? THa<  
#endif alh >"9~!  
`Y-|H;z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $aHAv/&(5  
#include "stdafx.h" I;5R2" 3  
#include "Capture.h" 8[r9HC  
#include "CaptureDlg.h" g  %K>  
#include <windowsx.h> [7(-T?_  
#pragma comment(lib,"hook.lib") O}9KJU  
#ifdef _DEBUG }X GEX:1K  
#define new DEBUG_NEW 3nT Z)L }  
#undef THIS_FILE \s3]_1F;t  
static char THIS_FILE[] = __FILE__; *  tCS  
#endif JN^ &S  
#define IDM_SHELL WM_USER+1 SN4Q))dAU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  +`7KSwa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xq6cKtSv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,+`61J3W  
class CAboutDlg : public CDialog (-]r~Ol^  
{ 8WE{5#oi  
 public: Y(cN}44  
  CAboutDlg(); +&zYZA8v  
  // Dialog Data 6v,z@!b  
  //{{AFX_DATA(CAboutDlg)  ^p n(=4  
  enum { IDD = IDD_ABOUTBOX }; k = ?h~n0M  
  //}}AFX_DATA WI]o cF  
  // ClassWizard generated virtual function overrides ^[%%r3"$C  
  //{{AFX_VIRTUAL(CAboutDlg) V8eB$in  
 protected: ZmOfEg|h\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D\<y)kh  
  //}}AFX_VIRTUAL 8/)qTUx:  
  // Implementation Ii7QJ:^  
 protected: %uv?we7  
  //{{AFX_MSG(CAboutDlg) u%'\UmE w  
  //}}AFX_MSG .2J L$"  
  DECLARE_MESSAGE_MAP() VMoSLFp^R  
}; jx acg^c  
7~#:>OjW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E\gim<]  
{ \{Q?^E  
 //{{AFX_DATA_INIT(CAboutDlg) S+TOSjfis  
 //}}AFX_DATA_INIT \om%Q[F7a  
} n G_6oe*=I  
=^H4Yck/5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eZ"1gYqy  
{ Bgmn2-  
 CDialog::DoDataExchange(pDX); E}%hz*Q)(  
 //{{AFX_DATA_MAP(CAboutDlg) 5[j`6l  
 //}}AFX_DATA_MAP T~h5B(J;  
} JCAq8=zM  
<~ JO s2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3\T2?w9u(  
 //{{AFX_MSG_MAP(CAboutDlg) (KvROV);  
 // No message handlers &uC@|dbC5  
 //}}AFX_MSG_MAP [AV4m   
END_MESSAGE_MAP() Ltjbxw"Qd  
`jS T  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?\8?%Qk  
: CDialog(CCaptureDlg::IDD, pParent) j~j\\Y  
{ i#%aTRKHd6  
 //{{AFX_DATA_INIT(CCaptureDlg) G,;,D9jO7  
  m_bControl = FALSE; EyY.KxCB  
  m_bAlt = FALSE; wP,JjPUt  
  m_bShift = FALSE; ;[RZ0Uy=  
  m_Path = _T("c:\\"); nx0K$ Ptq  
  m_Number = _T("0 picture captured."); +cU>k}  
  nCount=0; sB69R:U;  
  bRegistered=FALSE; 8w({\=  
  bTray=FALSE; ;gC|  
 //}}AFX_DATA_INIT fwzb!"!.@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V.wqZ {G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g/13~UM\  
} &@ JvnO:  
(knp#   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9'hv%A:\3  
{ };'\~g,1  
 CDialog::DoDataExchange(pDX); nC{%quwh{  
 //{{AFX_DATA_MAP(CCaptureDlg) #97h6m?  
  DDX_Control(pDX, IDC_KEY, m_Key); Fs[aa#v4B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Vb BPB5 $q  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u{["50~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ] }f9JNf$  
  DDX_Text(pDX, IDC_PATH, m_Path); Pz$R(TV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q\\gpCgp  
 //}}AFX_DATA_MAP vFEQ7 qI  
} /  g 2b  
IHRGw  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) kA7mLrON  
//{{AFX_MSG_MAP(CCaptureDlg) IKie1!ZU{"  
 ON_WM_SYSCOMMAND() cyJG8f  
 ON_WM_PAINT() }^B6yWUN  
 ON_WM_QUERYDRAGICON() s`>[F@N7.o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [5Lz/ix=  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9P{;H usNw  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ?ve#} \  
//}}AFX_MSG_MAP imiR/V>N  
END_MESSAGE_MAP() 7 I>G{  
epgPT'^  
BOOL CCaptureDlg::OnInitDialog() sUPz/Z.h  
{ @?"h !fyu  
 CDialog::OnInitDialog(); KN-avu_Ix  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mS0udHod  
 ASSERT(IDM_ABOUTBOX < 0xF000); }`+B=h-dW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r_;9' #&'  
 if (pSysMenu != NULL) /rSH"$  
 { Ks}Xgc\  
  CString strAboutMenu; ,-z9 #t  
  strAboutMenu.LoadString(IDS_ABOUTBOX); KF4PJi;*  
  if (!strAboutMenu.IsEmpty()) z5TuGY b<  
  { %6_AM  
   pSysMenu->AppendMenu(MF_SEPARATOR); qTQBt}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z(!00^  
  } o6//IOZ  
 } "W(Q%1!Wi  
 SetIcon(m_hIcon, TRUE); // Set big icon jv&!Kw.Ug  
 SetIcon(m_hIcon, FALSE); // Set small icon fxT-j s#S  
 m_Key.SetCurSel(0); %w7]@VZ  
 RegisterHotkey(); /a6Xa&(B  
 CMenu* pMenu=GetSystemMenu(FALSE); '}Ri`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;t+ub8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |hr]>P1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (e"iO`H  
 return TRUE; // return TRUE unless you set the focus to a control ^n+!4(@=  
} [k-+AA>:  
B2ec@]uD`  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 36am-G  
{ EAeqLtFqs  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |<O9Sb_  
 { t:fFU1x  
  CAboutDlg dlgAbout; A2|Ud_  
  dlgAbout.DoModal(); )Y)pmjZaG  
 } _/O25% l  
 else +k`!QM>e-  
 { +E1h#cc)  
  CDialog::OnSysCommand(nID, lParam); <vwkjCA`  
 } Onwp-!!.  
} ~,*b }O  
@'GGm#<   
void CCaptureDlg::OnPaint() ]7e =fM9V;  
{ hqRw^2F  
 if (IsIconic()) ciMzf$+G$  
 { PiA0]>  
  CPaintDC dc(this); // device context for painting Q~T$N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {P*m;a`}  
  // Center icon in client rectangle |7zd%!  
  int cxIcon = GetSystemMetrics(SM_CXICON); nMJ#<'v^!2  
  int cyIcon = GetSystemMetrics(SM_CYICON); P+$:(I  
  CRect rect; QcpXn4/*  
  GetClientRect(&rect); l<);s  
  int x = (rect.Width() - cxIcon + 1) / 2; A,4fEmWM  
  int y = (rect.Height() - cyIcon + 1) / 2; ){UcS/GI=  
  // Draw the icon &-;5* lg)0  
  dc.DrawIcon(x, y, m_hIcon); .?l\g-;=  
 } :>=\.\  
 else Q1+dCCY#F  
 { ^`G}gWBx}w  
  CDialog::OnPaint(); l]5w$dded~  
 } O?|gp<=d  
} /i77  
#f+$Ddg*  
HCURSOR CCaptureDlg::OnQueryDragIcon()  =kuMWaD  
{ QqU!Najf  
 return (HCURSOR) m_hIcon; !/wtYI-`  
} C 9t4#"  
S9#)A->  
void CCaptureDlg::OnCancel() h2D>;k  
{ %Z1N;g0  
 if(bTray)  s~Te  
  DeleteIcon(); bcYF\@};  
  CDialog::OnCancel(); 6H7],aMg$A  
} 4#l o$#  
!@v7Zu43,  
void CCaptureDlg::OnAbout() @mfEKU!  
{ ^f(@gS}?  
 CAboutDlg dlg; V 0rZz  
 dlg.DoModal(); dN$Tf  
} R47\Y  
15sp|$&`  
void CCaptureDlg::OnBrowse() /~<@*-'  
{ |)*fRL,  
 CString str; cMOyo<F#^=  
 BROWSEINFO bi; LSRk7'0  
 char name[MAX_PATH]; o !U 6?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }B1!gz$YNO  
 bi.hwndOwner=GetSafeHwnd(); j}C}:\-fY  
 bi.pszDisplayName=name; Ct>GYk$  
 bi.lpszTitle="Select folder"; UNBH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; mrjswF27$o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); q*>&^V$M  
 if(idl==NULL) RVQh2'w  
  return; &e!7Z40w@&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); SBS3?hw  
 str.ReleaseBuffer(); kbe-1 <72  
 m_Path=str; {Ja!~N;3  
 if(str.GetAt(str.GetLength()-1)!='\\') 1|jt"Hz  
  m_Path+="\\"; ?pd8w#O  
 UpdateData(FALSE); aSnF KB  
} eYvWZJa4  
@ rc{SB  
void CCaptureDlg::SaveBmp() %B.yW`,X  
{ %xyou:~0zs  
 CDC dc; b"{'T]"*j  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N=7pK&NHSG  
 CBitmap bm; $F5 b  
 int Width=GetSystemMetrics(SM_CXSCREEN); bXNk%W[n  
 int Height=GetSystemMetrics(SM_CYSCREEN); H|HYo\@F#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); VB*oGG  
 CDC tdc; \}|o1Xh2  
 tdc.CreateCompatibleDC(&dc); k5kxQhPf  
 CBitmap*pOld=tdc.SelectObject(&bm); |0f>aZ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e-EUf  
 tdc.SelectObject(pOld); D1=((`v '  
 BITMAP btm; ys kO  
 bm.GetBitmap(&btm); Z '7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %Da1(bBh  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (O(}p~s  
 BITMAPINFOHEADER bih; jr:7?8cH0L  
 bih.biBitCount=btm.bmBitsPixel; SR |`!  
 bih.biClrImportant=0; @/ohg0  
 bih.biClrUsed=0; pz.JWCU1  
 bih.biCompression=0; JAem0jPC8  
 bih.biHeight=btm.bmHeight; }*S `qW;B  
 bih.biPlanes=1; yvO{:B8%  
 bih.biSize=sizeof(BITMAPINFOHEADER); YF>m$?;  
 bih.biSizeImage=size; #6HA\dE  
 bih.biWidth=btm.bmWidth; 2$ze= /l  
 bih.biXPelsPerMeter=0; wG-HF'0L  
 bih.biYPelsPerMeter=0; <"my^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o9dY9o+Z  
 static int filecount=0; '$ t  
 CString name; I!Z_ [M  
 name.Format("pict%04d.bmp",filecount++); lrIjJ V  
 name=m_Path+name; hJpxf,?'K  
 BITMAPFILEHEADER bfh; A"dR{8&0  
 bfh.bfReserved1=bfh.bfReserved2=0; P 'od`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ud'-;W  
 bfh.bfSize=54+size; "4{LN}`  
 bfh.bfOffBits=54; LQRQA[^  
 CFile bf; F7EKoDt  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ GQUe!G9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (Fhs"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); WGZ9B^A  
  bf.WriteHuge(lpData,size); kr9*,E9cv  
  bf.Close(); %|q>pin2  
  nCount++; q %"VYt4  
 } st:`y=F_  
 GlobalFreePtr(lpData); D!Pq4'd(  
 if(nCount==1) 0vD7v  
  m_Number.Format("%d picture captured.",nCount); _n50C"X=&(  
 else l:,'j@%  
  m_Number.Format("%d pictures captured.",nCount); ?!d&E ?9\  
  UpdateData(FALSE); QLiu2U o  
} 8y.wSu  
Enn"hdI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1;Cyz)  
{ b)qoh^  
 if(pMsg -> message == WM_KEYDOWN) Ch|jtVeuyJ  
 { &-Gqdnc  
  if(pMsg -> wParam == VK_ESCAPE) )I^7)x  
   return TRUE; SBfT20z[  
  if(pMsg -> wParam == VK_RETURN) .yqM7U_  
   return TRUE; f=r<nb'H  
 } gv- xm  
 return CDialog::PreTranslateMessage(pMsg); %4,O 2\0?&  
} _M`--.{\O[  
F`XP@Xx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `tA" }1;ka  
{ "8x8UgG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~5%W:qwQ  
  SaveBmp(); Vr`R>S,-  
  return FALSE; NflD/q/ L  
} ;S^'V  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ q$Zh@  
 CMenu pop; rrBsb -  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xSsa(b  
 CMenu*pMenu=pop.GetSubMenu(0); v4`"1Ss,K  
 pMenu->SetDefaultItem(ID_EXITICON); AQ,' 6F9  
 CPoint pt; .*Ct bGw  
 GetCursorPos(&pt); $j5K8Ad  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); emqZztccZ  
 if(id==ID_EXITICON) ^6MU 0Q2  
  DeleteIcon(); e478U$  
 else if(id==ID_EXIT) >>t@}F)  
  OnCancel(); `(ue63AZ  
 return FALSE; ~obqG!2m  
} 4U+xb>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7vrl'^1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S >X:ZYYC  
 AddIcon(); M3c$=>  
 return res; e.7EU  
} @s ?  
l1OE!W W  
void CCaptureDlg::AddIcon() 5 ZGNz1)?V  
{ jjw`Dto&  
 NOTIFYICONDATA data; Dwr)0nk  
 data.cbSize=sizeof(NOTIFYICONDATA); F;4vPbH+  
 CString tip; Wz49i9e+d  
 tip.LoadString(IDS_ICONTIP); bMg(B-uF7  
 data.hIcon=GetIcon(0); Ui_8)z _  
 data.hWnd=GetSafeHwnd(); |ef7bKU8  
 strcpy(data.szTip,tip); 5\5/  
 data.uCallbackMessage=IDM_SHELL; =.f-w0V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lT(WD}OS  
 data.uID=98; V@e?#iz  
 Shell_NotifyIcon(NIM_ADD,&data); &C, 'x4c"  
 ShowWindow(SW_HIDE); 7~^GA.92  
 bTray=TRUE; oTU!R ,  
} jnKWZ/R  
~:kZgUP_f  
void CCaptureDlg::DeleteIcon() GK )?YM  
{ BP'36?=Zo  
 NOTIFYICONDATA data; J>wt (] y  
 data.cbSize=sizeof(NOTIFYICONDATA); NO "xL,  
 data.hWnd=GetSafeHwnd(); 9YIM'q>`v  
 data.uID=98; :~e>Ob[,"  
 Shell_NotifyIcon(NIM_DELETE,&data); +Mo9kC  
 ShowWindow(SW_SHOW); ov ` h  
 SetForegroundWindow(); tZ: _ag)o  
 ShowWindow(SW_SHOWNORMAL); ^ =bu(L  
 bTray=FALSE; fi-WZ  
} a oD`=I*<  
z1PBMSG  
void CCaptureDlg::OnChange() Q]Y*K  
{ q0i(i.h  
 RegisterHotkey(); [,t*Pfq'W8  
} xu/cq9  
1an^1!  
BOOL CCaptureDlg::RegisterHotkey() R&8Iz yM  
{ H[s(e5 6z  
 UpdateData(); +%zAQeb  
 UCHAR mask=0; V)Z}En["1  
 UCHAR key=0; >Wm `v.-  
 if(m_bControl) j"ThEx0  
  mask|=4; Y;dz,}re  
 if(m_bAlt) Bn=by{i  
  mask|=2; f2Klt6"9  
 if(m_bShift) Uol|9F  
  mask|=1; B:b5UD  
  key=Key_Table[m_Key.GetCurSel()]; AF;)#T<  
 if(bRegistered){ rn/ /%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <r .)hT"0  
  bRegistered=FALSE; \8)U!9,$nn  
 } lP[w?O  
 cMask=mask; 5gH1.7i b  
 cKey=key; ,X[kt z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); QwNly4  
 return bRegistered; !O+) sbd<  
} aE`c%T):`  
_X^1IaL  
  四、小结 V]|^&A _c  
3 R=,1<  
  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。
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