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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: FSB$D)4z>b  
  aD^MoB3  
  一、实现方法 @88 efF  
SM<kE<q#  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: C G7 LF  
",+uvJT1O  
#pragma data_seg("shareddata") 2=|IOkY  
HHOOK hHook =NULL; //钩子句柄 GwV FD%  
UINT nHookCount =0; //挂接的程序数目 @W,Y_8:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y>%NuL|s  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  %!S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P&YaJUq.u  
static int KeyCount =0; .s?OKy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4s8E:I=K  
#pragma data_seg() LNb![Rq  
525 >=h  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ba ?k:b  
vB{b/xmah  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 0_EF7`T  
f#t^<`7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR a8 1%M  
cKey,UCHAR cMask) @rMW_7[y  
{ 9|`@czw  
 BOOL bAdded=FALSE; #j JcgR<  
 for(int index=0;index<MAX_KEY;index++){ YMd&+J`  
  if(hCallWnd[index]==0){ ?Sqm`)\>4  
   hCallWnd[index]=hWnd; ["M >  
   HotKey[index]=cKey; F~AS(sk  
   HotKeyMask[index]=cMask; 7y\g~?5N  
   bAdded=TRUE; m0"\3@kB  
   KeyCount++; 6T s`5$e  
   break; "=(;l3-o  
  } {Jc!T:vJ  
 } aiHr2x6  
 return bAdded; B`aAvD`7  
} }}_uN-m  
//删除热键 &>{>k<z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sdWl5 "  
{ :ct+.#  
 BOOL bRemoved=FALSE; \gkajY-?  
 for(int index=0;index<MAX_KEY;index++){ VZoOdR:d  
  if(hCallWnd[index]==hWnd){ }v,THj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bEKLameKv  
    hCallWnd[index]=NULL; DO1{r/Ib.{  
    HotKey[index]=0; Oy&'zigJ  
    HotKeyMask[index]=0; p#d UL9  
    bRemoved=TRUE; W wha?W>  
    KeyCount--; j%;)CV G"  
    break; F21[r!3  
   } HH?*"cKF~  
  } r<v%Zp  
 } jVIpbG4 4  
 return bRemoved; ~S6{VK.  
} [R>   
][nUPl  
@UX@puK`/  
  DLL中的钩子函数如下: ;vdgF  
@W8}N|jek  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DZRxp,  
{ l`&6W?C  
 BOOL bProcessed=FALSE; :$aW@?zAY  
 if(HC_ACTION==nCode) [r8 d+  
 { SWb5K0YRn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >EtP^Lu~f_  
   switch(wParam) lg >AWTW[  
   {  lM*O+k  
    case VK_MENU: `uA&w}(G  
     MaskBits&=~ALTBIT; Nh9!lBm*]  
     break; =bWq 3aP)P  
    case VK_CONTROL: }!V<"d,!  
     MaskBits&=~CTRLBIT; !d .>r 7w  
     break; )`mF.87b&h  
    case VK_SHIFT: dY<#a,eS  
     MaskBits&=~SHIFTBIT; >;v0zE  
     break; ;|QR-m2/  
    default: //judge the key and send message acY[?L_6J  
     break; v:MS0]  
   } 2TEeP7  
   for(int index=0;index<MAX_KEY;index++){ RCYbRR4y  
    if(hCallWnd[index]==NULL) "n }fEVJ,  
     continue; [9om"'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /'6[*]IZP  
    { lhl 0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ko)T>8:  
     bProcessed=TRUE; .oj"ru  
    } 3b@1Zahz  
   } jA4v?(AO}#  
  } $L8s/1up  
  else if((lParam&0xc000ffff)==1){ //有键按下 K)UOx#xe1  
   switch(wParam) l0\>zWLZZ9  
   { /%9p9$kFot  
    case VK_MENU: AdOAh y2H  
     MaskBits|=ALTBIT; oy bzD  
     break; ( L\G!pP.  
    case VK_CONTROL: w9<FX>@  
     MaskBits|=CTRLBIT; f^sb0nU  
     break; HcVs(]tIW  
    case VK_SHIFT: F>kn:I"X)  
     MaskBits|=SHIFTBIT; +1jqCW  
     break; %GCd?cFF  
    default: //judge the key and send message D.R|HqZ  
     break; |uwteG5?$s  
   } TL{pc=eBo  
   for(int index=0;index<MAX_KEY;index++){ ku9F N  
    if(hCallWnd[index]==NULL) {_ho!OS>  
     continue; #'Y6UGJ\n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ; :\,x  
    { 8tRh V2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Qn)[1v  
     bProcessed=TRUE; S%s|P=u  
    } \BcJDdL  
   } ]AA*f_!  
  } 2a(yR >#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Ldj^O9p(  
   for(int index=0;index<MAX_KEY;index++){ 2]RH)W86;  
    if(hCallWnd[index]==NULL) I cA\3j  
     continue; 9g5{3N3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~K#_'Ldrd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4f[M$xU&h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m *bKy;'8  
   } xKLcd+hCZ  
  } i =fOdp  
 } xVz -_z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u:H 3.5)%  
} zV(tvt  
i~Ob( YIH  
  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: 2N8sq(LK{  
<\9Ijuq}k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \ NSw<.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fRa-bqQ  
ah"MzU)  
  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: 9q)nNX<$)  
M|E2&ht  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p9 ,\{Is  
{ bb0McEQy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $s(4?^GP  
 { t"bPKFRy9E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b}*@=X=4o  
  SaveBmp(); I1 R\Ts@  
  return FALSE; c;8"vJ  
 } a2=uM}Hsp  
 …… //其它处理及默认处理 %)hIpxOrX  
} Or#+E2%1E  
vH?+JN"A  
. I&)MZ>n  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 C|~JPcl  
"K$Wh1<7  
  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。 ~iR!3+yg4  
si!9Gz;  
  二、编程步骤 Rw ao5l=x  
cM<hG:4%wX  
  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"; 0@e}hv;  
W "\tkh2  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; CWe>jlUQ  
Zc\h15+P  
  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; Rr;LV<q+  
q~' K9  
  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; Jyz$&jqyr'  
?(NT!es  
  5、 添加代码,编译运行程序。 L3=YlX`UL  
fF9oYOh|  
三、程序代码 ^I0GZG  
>]XaUQ-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ND55`KT4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "J[i=~(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ : ` 6$/DK  
#if _MSC_VER > 1000 400Tw`AiJ  
#pragma once tp0!,ne*  
#endif // _MSC_VER > 1000 e"s{_V  
#ifndef __AFXWIN_H__ w{zJE]7  
#error include 'stdafx.h' before including this file for PCH q{De&Bu  
#endif " ,aT<lw.  
#include "resource.h" // main symbols 9p\wTzA  
class CHookApp : public CWinApp 1nlE3Y?AV  
{ {7![3`%7  
 public: {?>bblw/d  
  CHookApp(); peTO-x^a-  
  // Overrides n"<GJ.{  
  // ClassWizard generated virtual function overrides $kD`$L@U  
  //{{AFX_VIRTUAL(CHookApp) 4z0R\tjT  
 public: leb^,1/D6  
  virtual BOOL InitInstance(); zmL~]! ~&  
  virtual int ExitInstance();  fBWJ%W  
  //}}AFX_VIRTUAL 5Du>-.r  
  //{{AFX_MSG(CHookApp) hDD~,/yVxs  
  // NOTE - the ClassWizard will add and remove member functions here. y5AXL5  
  // DO NOT EDIT what you see in these blocks of generated code ! c2\rjK   
  //}}AFX_MSG &t*8oNwSs  
  DECLARE_MESSAGE_MAP() n2y/zP>TC  
}; Z*vpQBbu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S`2mtg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (4{ C7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); srChY&h?<  
BOOL InitHotkey(); ll<9f)  
BOOL UnInit(); L%o65  
#endif Lr24bv\  
.y;\puNq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9OQ0Yc!3  
#include "stdafx.h" ]lB3qEn<  
#include "hook.h" .X LV:6  
#include <windowsx.h> 2*-ENW2  
#ifdef _DEBUG -M>K4*%K  
#define new DEBUG_NEW 5}d/8tS  
#undef THIS_FILE SN[L4}{  
static char THIS_FILE[] = __FILE__; 0,~6TV<K  
#endif GOZQ5m -  
#define MAX_KEY 100 |B1; l<|`  
#define CTRLBIT 0x04 FQ_%)Ty2  
#define ALTBIT 0x02 O'!r]0Q  
#define SHIFTBIT 0x01 "3Xv%U9@  
#pragma data_seg("shareddata") <9d-Hz  
HHOOK hHook =NULL; -e`oW.+  
UINT nHookCount =0; IB#iJ# ,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1|l)gfcP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT VT5cxB<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,>QMyI hv  
static int KeyCount =0; *b6I%MZn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }o!#_N0T  
#pragma data_seg() Xew1LPI  
HINSTANCE hins; * Y%<b86U  
void VerifyWindow(); XYK1-m}2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) A'~%_}  
//{{AFX_MSG_MAP(CHookApp) f- k|w%R@  
// NOTE - the ClassWizard will add and remove mapping macros here. { /F rs*AF  
// DO NOT EDIT what you see in these blocks of generated code! 0U~;%N+lv  
//}}AFX_MSG_MAP _Ra<|NVQh  
END_MESSAGE_MAP() #4P3xa  
n ,&/D  
CHookApp::CHookApp() {XDY:`vZ}  
{ !e:iB7<  
 // TODO: add construction code here, {;Y 89&*R  
 // Place all significant initialization in InitInstance k"q!|+&Fs  
} E,<\T6/%q  
Bg 7j5  
CHookApp theApp; L= :d!UF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j]!7BHC  
{ +&7[lsD*  
 BOOL bProcessed=FALSE; '#,e @v  
 if(HC_ACTION==nCode) DD/>{kff  
 { _4.]A 3;}  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z#OhYm+y  
   switch(wParam)  /i-xX*  
   { `?zg3GD_  
    case VK_MENU: o[bE  
     MaskBits&=~ALTBIT; s FQ4O- SM  
     break; M1/M}~  
    case VK_CONTROL: MG7 ?N #  
     MaskBits&=~CTRLBIT; "wnpiB}  
     break; }pl]9  
    case VK_SHIFT: ? fbgU  
     MaskBits&=~SHIFTBIT; @pF fpHq?>  
     break; ZR;8r Z](  
    default: //judge the key and send message M#\  <  
     break; (|0.m8D~D  
   } BR& Aq  
   for(int index=0;index<MAX_KEY;index++){ sJ))<,e5I  
    if(hCallWnd[index]==NULL) [K cki+  
     continue; AfbB~LlBq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }J ei$0x  
    { mQd4#LJ_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W>5vRwx00  
     bProcessed=TRUE; ,hpH!J'5f/  
    } ~ON1Zw[+  
   } *#&k+{a^2  
  } ^CZCZ,v  
  else if((lParam&0xc000ffff)==1){ //Key down d5@X#3Hd  
   switch(wParam) ADv^eJJ|  
   { &a%WM   
    case VK_MENU: a|DsHZ^6^  
     MaskBits|=ALTBIT; C5O5S:|'  
     break; w5F4"nl#O}  
    case VK_CONTROL: ./'~];&  
     MaskBits|=CTRLBIT; GXDC@+$14  
     break; mu6039qy  
    case VK_SHIFT: s<[A0=LH  
     MaskBits|=SHIFTBIT; ,O:EX0  
     break; :a_BD  
    default: //judge the key and send message ?z2jk  
     break; ?QCmSK=L  
   } w)+wj[6 E  
   for(int index=0;index<MAX_KEY;index++) A6Ghj{~  
   { =N YgGEFq.  
    if(hCallWnd[index]==NULL) QGs1zfh*  
     continue; T>}0) s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )y9;OA  
    { Y/. AUN Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &+mV7o  
     bProcessed=TRUE; yJ!OsD  
    } Z[",$Lt  
   } 21r= = H$  
  } T vrk^!  
  if(!bProcessed){ (GCG/8s  
   for(int index=0;index<MAX_KEY;index++){ K(<$.  
    if(hCallWnd[index]==NULL) 8zhBA9Y#~  
     continue; y }\r#"Z`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rRB~=J"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \HAJ\9*w)  
   } 95=g Y  
  } kOw=c Gt  
 } ^_v[QV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AY#wVy  
} t)YUPDQ@J  
6X/wd k  
BOOL InitHotkey() qE )Y}oN  
{ f|OI`  
 if(hHook!=NULL){ Vclr)}5  
  nHookCount++; Z&_y0W=t  
  return TRUE; PK_s#uC  
 } otO j^xU  
 else t/}L36@+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 'It?wB W  
  if(hHook!=NULL) O~V1Ywfq7^  
   nHookCount++; A (Bk@;  
  return (hHook!=NULL); u*2fP]n  
} kw*)/$5]  
BOOL UnInit() P0^c?s"I  
{ 8{dEpV*  
 if(nHookCount>1){ ;HDZ+B  
  nHookCount--; S}[l*7  
  return TRUE; "'m)VG  
 } |6aJwe+*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tQWWgLM  
 if(unhooked==TRUE){ v:E;^$6Vn  
  nHookCount=0; Yu'a<5f  
  hHook=NULL; i[\w%(83Fi  
 } r'/\HWNP  
 return unhooked; e@E17l-  
} dL-i)F  
Vtr3G.P^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ly;I,)w  
{ tJNIr5o  
 BOOL bAdded=FALSE; zh\$t]d<I  
 for(int index=0;index<MAX_KEY;index++){ bNGCOj  
  if(hCallWnd[index]==0){ w5`#q&?  
   hCallWnd[index]=hWnd; CEuWw:)  
   HotKey[index]=cKey; sYJL-2JX  
   HotKeyMask[index]=cMask; C5|db{=\.*  
   bAdded=TRUE; <47k@Ym   
   KeyCount++; OF[?Z  
   break; &iNwvA%9D  
  } gV8"V Zg2  
 } O sQkA2=  
 return bAdded; #uSK#>H_!  
} .wmnnvtl,  
=!BobC- [b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) afHaB/t{R  
{ ks*Y9D*=  
 BOOL bRemoved=FALSE; wJe?t$ac?  
 for(int index=0;index<MAX_KEY;index++){ %%%S"$t  
  if(hCallWnd[index]==hWnd){ UUeB;'E+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /@hJpz|+   
    hCallWnd[index]=NULL; )tS-.PrA-  
    HotKey[index]=0; .h4\{|  
    HotKeyMask[index]=0;  4*TmlY  
    bRemoved=TRUE; &SH1q_&BQ  
    KeyCount--; ` J]xP$)  
    break; +L0w;wT  
   } zvY+R\,in  
  } MuwQZ]u  
 } Ha%F"V*  
 return bRemoved; 2?W7I/F  
} .Pe9_ZH$W  
ZtK\HDdp  
void VerifyWindow() Gh}yb-$N`&  
{ o:"anHs  
 for(int i=0;i<MAX_KEY;i++){ :P$#MC  
  if(hCallWnd!=NULL){ 6.5wZN9<|  
   if(!IsWindow(hCallWnd)){ =>|C~@C?  
    hCallWnd=NULL; $d/&k`  
    HotKey=0; (&[[46  
    HotKeyMask=0; +H_MV=A^  
    KeyCount--; )55\4<ty  
   } bUZ_UW  
  } pu+ur=5&  
 } i%-Ld Ka}"  
} Tde0~j}  
<@G8ni  
BOOL CHookApp::InitInstance() KVPR}qTP;  
{ wJeG(h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Md,pDWb  
 hins=AfxGetInstanceHandle(); v .=/Y(J  
 InitHotkey(); maNW{"1  
 return CWinApp::InitInstance(); %g3,qI  
} DWU`\9xA*  
ff e1lw%  
int CHookApp::ExitInstance() fY,|o3#  
{ :K':P5i  
 VerifyWindow(); =8Ehrlq  
 UnInit(); }tG3tz0%fX  
 return CWinApp::ExitInstance();  fvEAIs  
} nwA8ALhE  
hePPxKQ-  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OtTBErQNF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5GQLd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9zBMlc$X  
#if _MSC_VER > 1000 X[](Kj^`<  
#pragma once nXA\|c0  
#endif // _MSC_VER > 1000 QAPu<rdJP  
g&Vcg`  
class CCaptureDlg : public CDialog `.%JjsD<  
{ !ABiy6d  
 // Construction eq[Et +  
 public: &QNY,Pj  
  BOOL bTray; aG+j9Q_  
  BOOL bRegistered; 5D Y\:AF  
  BOOL RegisterHotkey(); W_`A"WdT.  
  UCHAR cKey; HYK!}&  
  UCHAR cMask; ]Mi.f3QlO6  
  void DeleteIcon(); h3* x[W  
  void AddIcon(); )IL #>2n?  
  UINT nCount; .8WXC   
  void SaveBmp(); ({^9<Us  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor e>}}:Ud  
  // Dialog Data \ HZ9S=  
  //{{AFX_DATA(CCaptureDlg) Q`%R[#  
  enum { IDD = IDD_CAPTURE_DIALOG }; lrWQOYf2  
  CComboBox m_Key; FV39QG4b4  
  BOOL m_bControl; 4|?{VQ  
  BOOL m_bAlt; Oakb'  
  BOOL m_bShift; 7.Kc:7  
  CString m_Path; #A7jyg":  
  CString m_Number; C? 4JXW  
  //}}AFX_DATA d[D&J  
  // ClassWizard generated virtual function overrides S6d`ioi-  
  //{{AFX_VIRTUAL(CCaptureDlg) 7nU6k%_%  
 public: R\|lt)h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); SOZPZUUEJ  
 protected: %dST6$Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *?ITns W<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ih}1%Jq  
  //}}AFX_VIRTUAL pd[ncL  
  // Implementation LQYy;<K  
 protected: I6!5Yj]O"  
  HICON m_hIcon; 8eBOr9l+j  
  // Generated message map functions H)w(q^i  
  //{{AFX_MSG(CCaptureDlg) }x0- V8  
  virtual BOOL OnInitDialog(); ^Xb7[ +I6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); = &wmWy  
  afx_msg void OnPaint(); hU]HTX'R  
  afx_msg HCURSOR OnQueryDragIcon(); %V`F!D<D  
  virtual void OnCancel(); #H?t!DU  
  afx_msg void OnAbout(); !$;a[Te  
  afx_msg void OnBrowse(); YgUH'P-  
  afx_msg void OnChange(); *l+OlQI0+  
 //}}AFX_MSG ?>c=}I#Ui-  
 DECLARE_MESSAGE_MAP() -t2T(ha  
}; "9EE1];NT  
#endif 2& PPz}Sw  
iD38\XNMV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mW2,1}Jv  
#include "stdafx.h" J5p"7bc  
#include "Capture.h" 3.d"rl  
#include "CaptureDlg.h" Y9=K]GB  
#include <windowsx.h> )4>2IQ  
#pragma comment(lib,"hook.lib") J7D}%  
#ifdef _DEBUG f3j{VN  
#define new DEBUG_NEW "gtHTqheH  
#undef THIS_FILE [H<bh%  
static char THIS_FILE[] = __FILE__; O,bkQY$v  
#endif .nu @ o40  
#define IDM_SHELL WM_USER+1 T<3BT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VV4Gjc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %3q0(Xl  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /MMd`VrC2  
class CAboutDlg : public CDialog Migd(uw'  
{ Zn=T#o  
 public: \!vN   
  CAboutDlg(); Zv11uH-C  
  // Dialog Data DS-0gVYeDW  
  //{{AFX_DATA(CAboutDlg) ?[<Tx-L  
  enum { IDD = IDD_ABOUTBOX }; j"^ +oxH  
  //}}AFX_DATA znJhP}(  
  // ClassWizard generated virtual function overrides fj7|D'c  
  //{{AFX_VIRTUAL(CAboutDlg) -9 !.m  
 protected: }G o$ \Bk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vb 1@yQ  
  //}}AFX_VIRTUAL O%g $9-?F0  
  // Implementation 1g# #sSa6  
 protected: b`yZ|j'ikd  
  //{{AFX_MSG(CAboutDlg) SK1!thQy  
  //}}AFX_MSG b*a2,MiM  
  DECLARE_MESSAGE_MAP() |Fm6#1A@  
}; BqDKT  
dkgSvi :!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) iv`O /T  
{ }+o:j'jB  
 //{{AFX_DATA_INIT(CAboutDlg) MV_Srz  
 //}}AFX_DATA_INIT ~DRmON5 M  
} "mL++>ZSQ  
c4&'D;=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 73{'k K  
{ /525w^'pd  
 CDialog::DoDataExchange(pDX); f/WQ[\<!I  
 //{{AFX_DATA_MAP(CAboutDlg) iGB_{F~t4}  
 //}}AFX_DATA_MAP T=hho Gn  
} v_e9}yI   
J"=1/,AS  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;.xoN|Per  
 //{{AFX_MSG_MAP(CAboutDlg) J q{7R  
 // No message handlers xtPLR/Z  
 //}}AFX_MSG_MAP L9pvG(R%  
END_MESSAGE_MAP() lis/`B\x  
*  tCS  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) h)~=Dm  
: CDialog(CCaptureDlg::IDD, pParent)  Qk!;M |  
{  +`7KSwa  
 //{{AFX_DATA_INIT(CCaptureDlg) !O\;Nua  
  m_bControl = FALSE; N#lDW~e'  
  m_bAlt = FALSE; 'r(1Nj  
  m_bShift = FALSE; -a*K$rnB  
  m_Path = _T("c:\\"); DD" $1o"  
  m_Number = _T("0 picture captured."); 1/p*tZP8i  
  nCount=0; {G <kA(Lm  
  bRegistered=FALSE; s yU9O&<  
  bTray=FALSE; Kp+CH7I*  
 //}}AFX_DATA_INIT Rqwzh@}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,q(&)L$S  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); b jAnaya  
} ThPE 0V  
7+x? " 4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]9}HEu;1M  
{ tm7u^9]  
 CDialog::DoDataExchange(pDX); sr@j$G#uW5  
 //{{AFX_DATA_MAP(CCaptureDlg) ;8!Z5H  
  DDX_Control(pDX, IDC_KEY, m_Key); %uv?we7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u%'\UmE w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "V{yi!D{<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); G:x*BH+  
  DDX_Text(pDX, IDC_PATH, m_Path); e><5Pr)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7~#:>OjW  
 //}}AFX_DATA_MAP # :T-hRu  
} pJN${  
0$7.g!h?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VqL.iZ-  
//{{AFX_MSG_MAP(CCaptureDlg) +[SgO}sF  
 ON_WM_SYSCOMMAND() 2pdvWWh3l  
 ON_WM_PAINT() pP(XIC  
 ON_WM_QUERYDRAGICON() eIl]oC7*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xBu1Ak8w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4&/j|9=X  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P0 `Mdk371  
//}}AFX_MSG_MAP Y(.OF Q  
END_MESSAGE_MAP() Xf)|Pu  
eY{+~|KZ  
BOOL CCaptureDlg::OnInitDialog() ;n|^1S<[  
{ ~4q5 k5.,  
 CDialog::OnInitDialog(); }I`a`0/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); iNwqF0  
 ASSERT(IDM_ABOUTBOX < 0xF000); <b/~.$a'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); FI"`DMb}  
 if (pSysMenu != NULL) s1?[7yC  
 { p4p@^@<>X  
  CString strAboutMenu; ~b {Gz6u>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;[RZ0Uy=  
  if (!strAboutMenu.IsEmpty()) nx0K$ Ptq  
  { E^U0f/5 m  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?5kHa_^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =2w4C_  
  } pm{|?R  
 } eAPXWWAZJ1  
 SetIcon(m_hIcon, TRUE); // Set big icon ~ ihI_q"  
 SetIcon(m_hIcon, FALSE); // Set small icon ,vW:}&U  
 m_Key.SetCurSel(0); lI>SUsQFfm  
 RegisterHotkey(); a<]B B$~  
 CMenu* pMenu=GetSystemMenu(FALSE); g/13~UM\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I(=V}s2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QRLt9L  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); OT'[:|x ;  
 return TRUE; // return TRUE unless you set the focus to a control > x IJE2  
} ja=F7Usb  
1~ $);US  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d#2$!z#  
{ ')GSAY7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'l,V*5L  
 { u^029sH6j  
  CAboutDlg dlgAbout; BB|?1"neg  
  dlgAbout.DoModal(); # p[',$cC  
 } wgd/(8d  
 else uYrfm:4S  
 { MQin"\  
  CDialog::OnSysCommand(nID, lParam); {nU=%w"\  
 } {}:ToIp  
} v@#b}N0n  
^k<o T'89  
void CCaptureDlg::OnPaint() %/updw#{B  
{ OT&k.!=  
 if (IsIconic()) Y2'cs~~$Ce  
 { ]~Y<o  
  CPaintDC dc(this); // device context for painting T6ENtp  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )?wJF<[_#  
  // Center icon in client rectangle ;2Q~0a|  
  int cxIcon = GetSystemMetrics(SM_CXICON); vX]Gf4,  
  int cyIcon = GetSystemMetrics(SM_CYICON); ytNO*XoR  
  CRect rect; &HSq(te  
  GetClientRect(&rect); vzmc}y G  
  int x = (rect.Width() - cxIcon + 1) / 2; x`6<m!d`  
  int y = (rect.Height() - cyIcon + 1) / 2; ]vuwkn+)  
  // Draw the icon _ 84ut  
  dc.DrawIcon(x, y, m_hIcon); XV^1tX>f{  
 } H ty0qr3  
 else A/`%/0e   
 { XkyKBg-  
  CDialog::OnPaint(); IUtx!.]4  
 } "--t e  
} >3&O::]3  
d|4}obCt  
HCURSOR CCaptureDlg::OnQueryDragIcon() `O'`eY1f  
{ 4V~?.  
 return (HCURSOR) m_hIcon; "?mJqA  
} 2U-3Q]/I}  
4 {9B9={  
void CCaptureDlg::OnCancel() @g G<le6  
{ ES40?o*]x  
 if(bTray) w|Nz_3tI  
  DeleteIcon(); In[Cr/&/Y  
  CDialog::OnCancel(); #h/Mbj~S  
} )XWP\ h  
|.wEm;Bz  
void CCaptureDlg::OnAbout() H'HSD,>(  
{ U#U]Pt  
 CAboutDlg dlg; ;`6^6p\p  
 dlg.DoModal(); @_z4tUP  
} ;,]P=Ey  
zz& ?{vJ  
void CCaptureDlg::OnBrowse() cYqfsd# B  
{ ~jsLqY*(+  
 CString str; "9n3VX)  
 BROWSEINFO bi; $HJwb-I  
 char name[MAX_PATH]; R"K#7{p9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); GaSPJt   
 bi.hwndOwner=GetSafeHwnd(); c*@G_rb  
 bi.pszDisplayName=name; QD%L0;j  
 bi.lpszTitle="Select folder"; <^$<#K d  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; NB<A>baL*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2+X\}s1vN  
 if(idl==NULL) *E{2J:`  
  return; \_B[{e7z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %RDI!e<e}  
 str.ReleaseBuffer(); Qca&E`~Q  
 m_Path=str; 7NJhRz`_  
 if(str.GetAt(str.GetLength()-1)!='\\') R+CM`4CD  
  m_Path+="\\"; O|w J)  
 UpdateData(FALSE); KIWe@e  
} %dY<=x#b  
xNbPsoK  
void CCaptureDlg::SaveBmp() r\/+Oa'  
{ []D@Q+1  
 CDC dc; oJfr +3I  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F;]%V%F.X  
 CBitmap bm; -a-(r'Qc(  
 int Width=GetSystemMetrics(SM_CXSCREEN); [Jv@J\  
 int Height=GetSystemMetrics(SM_CYSCREEN); #t+d iR  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YIjTL!bA"  
 CDC tdc; nvPwngEQm  
 tdc.CreateCompatibleDC(&dc); q`r**N+zn  
 CBitmap*pOld=tdc.SelectObject(&bm); l'eyq}&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6R^^.tCs  
 tdc.SelectObject(pOld); RU\/j%^  
 BITMAP btm; =AuR:Tx  
 bm.GetBitmap(&btm); k1!@^A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Sy 'Dp9!|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); o>VVsH  
 BITMAPINFOHEADER bih; zE_i*c"`  
 bih.biBitCount=btm.bmBitsPixel; D gaMO,  
 bih.biClrImportant=0; YD7Oao4:o  
 bih.biClrUsed=0; $ , u+4h  
 bih.biCompression=0; ~sXcnxLz  
 bih.biHeight=btm.bmHeight; )+6MK(<"  
 bih.biPlanes=1; ->V<DZK  
 bih.biSize=sizeof(BITMAPINFOHEADER); =&:Y6XP  
 bih.biSizeImage=size; Ywwu0.H<  
 bih.biWidth=btm.bmWidth; v;ZA 4c  
 bih.biXPelsPerMeter=0; wH@Ns~[MA  
 bih.biYPelsPerMeter=0; :eCU/BC4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *IM;tD+7Q~  
 static int filecount=0; )>Yu!8i  
 CString name; .p(T^ m2A*  
 name.Format("pict%04d.bmp",filecount++); J Px~VnE%%  
 name=m_Path+name; yYfs y?3  
 BITMAPFILEHEADER bfh; GmP@;[H"  
 bfh.bfReserved1=bfh.bfReserved2=0; 8Q'0h m?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 1Yn +<I  
 bfh.bfSize=54+size; S.f5v8  
 bfh.bfOffBits=54; %ALwz[~]  
 CFile bf; 1{JV}O  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;&)-;l7M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =z /dcC$r  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @!1x7%]G  
  bf.WriteHuge(lpData,size); 8#g1P4  
  bf.Close(); BT"XT5@  
  nCount++; 9_5ow  
 } ruld B,n  
 GlobalFreePtr(lpData); KGFv"u{  
 if(nCount==1) ;4pYK@9w_  
  m_Number.Format("%d picture captured.",nCount); ~5oPpTAe  
 else G2T|RT $_K  
  m_Number.Format("%d pictures captured.",nCount); gp\<p-}  
  UpdateData(FALSE); .~7FyLl$  
} Kh_Lp$'0uM  
2_Z ? #Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3(,?S$>  
{ rQ qW_t%  
 if(pMsg -> message == WM_KEYDOWN) EU+S^SyZi  
 { =aTv! 8</  
  if(pMsg -> wParam == VK_ESCAPE) h[@tZ( jrY  
   return TRUE; 9'X7w G  
  if(pMsg -> wParam == VK_RETURN) &eX!#nQ_.  
   return TRUE; R)m'lMi|  
 } \r+8qC[,  
 return CDialog::PreTranslateMessage(pMsg); +O?KNZ  
} ~o~!+`@q  
gK'1ZLdZ2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) OD!& .%  
{ <d$x.in  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ XcUwr  
  SaveBmp(); O*FUTZd(J  
  return FALSE; 7x%R:^*4  
} LHo3 Niy.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g0["^P1tV  
 CMenu pop; :BV6y|J9O^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m3/O.DY%0  
 CMenu*pMenu=pop.GetSubMenu(0); [UWd W  
 pMenu->SetDefaultItem(ID_EXITICON); 9j6QX ~,  
 CPoint pt; )O@]uY  
 GetCursorPos(&pt); M# %a(Y3K)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NdD`Hn -  
 if(id==ID_EXITICON) z)r =+ -  
  DeleteIcon(); E;R n`oxk  
 else if(id==ID_EXIT) fUA uqfj[  
  OnCancel(); 1`qMj0Y_  
 return FALSE; IvtJ0  
} 4p,EBn9(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '|8} z4/g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) GE%Z9#E  
 AddIcon(); P 'od`  
 return res; ud'-;W  
} &keR~~/  
eEv@}1~  
void CCaptureDlg::AddIcon() M:[ %[+6  
{ I7n"&{s"*  
 NOTIFYICONDATA data; (<xfCH F5  
 data.cbSize=sizeof(NOTIFYICONDATA); EWkLXU6t  
 CString tip; [QoK5Yw{  
 tip.LoadString(IDS_ICONTIP); GkTiDm?  
 data.hIcon=GetIcon(0); CU@Rob}s  
 data.hWnd=GetSafeHwnd(); [`"ZjkR_J  
 strcpy(data.szTip,tip); .ufTQ?Fe  
 data.uCallbackMessage=IDM_SHELL; (jRm[7H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?En O"T.  
 data.uID=98; n%.7h3  
 Shell_NotifyIcon(NIM_ADD,&data); /YMj-S_b~  
 ShowWindow(SW_HIDE); '6cWS'9"  
 bTray=TRUE; m4hg'<<V  
} 1;Cyz)  
b)qoh^  
void CCaptureDlg::DeleteIcon() Ch|jtVeuyJ  
{ f$Fhf ?'  
 NOTIFYICONDATA data; R5 - @  
 data.cbSize=sizeof(NOTIFYICONDATA); qGB{7-ru  
 data.hWnd=GetSafeHwnd(); iW%I|&  
 data.uID=98; H2jgO?l;!  
 Shell_NotifyIcon(NIM_DELETE,&data); AicBSqUke  
 ShowWindow(SW_SHOW); 3yU.& k  
 SetForegroundWindow(); YA_c N5p/@  
 ShowWindow(SW_SHOWNORMAL); 5A3xVN=  
 bTray=FALSE; 26I_YL,S  
} d\|?-hY`[  
JP!~,mdS  
void CCaptureDlg::OnChange() UU;(rS/  
{ J\:R|KaP<p  
 RegisterHotkey(); "!ug_'VW  
} [6%VRqY  
^cP!\E-^  
BOOL CCaptureDlg::RegisterHotkey() ;Q OBBF3HG  
{ g"p%C:NN  
 UpdateData(); 4~Vx3gEV:  
 UCHAR mask=0; =JK@z  
 UCHAR key=0; %,}A@H ,  
 if(m_bControl) 8QLj["   
  mask|=4; pz\ +U7  
 if(m_bAlt) Bn#?zI  
  mask|=2; j7$e28|_n  
 if(m_bShift) !sQY&*  
  mask|=1; {GK;63`1  
  key=Key_Table[m_Key.GetCurSel()]; j<V Fn~*_  
 if(bRegistered){ v1+3}5b'uF  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wsZF;8ut  
  bRegistered=FALSE; \IV1j)I"u  
 } H8Bs<2  
 cMask=mask; `>f6) C-  
 cKey=key; (:TjoXXiY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); DEG[Z7Ju  
 return bRegistered; S1Wj8P-  
} *`ua'"="k  
:8=ikwQ  
  四、小结 &_dt>.  
{JZZZY!n2  
  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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