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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: ZUQ1\Iw  
  H_ .@{8I  
  一、实现方法 C;oP"K]4=  
)U>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: @8DB Ln w  
4Mi*bN,  
#pragma data_seg("shareddata") bo <.7  
HHOOK hHook =NULL; //钩子句柄 l4O}>#  
UINT nHookCount =0; //挂接的程序数目 I=x   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pHsp]a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %~4R)bsJ'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7xVI,\qV  
static int KeyCount =0; bo$xonV@y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b}9K"GT  
#pragma data_seg() Xleoh2&M  
:)q/8 0@  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 r*>XkM& M  
y{? 6U>_  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: j Z3N+_J1  
*;m5^i<,;S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5[al^'y  
cKey,UCHAR cMask) x|U]x  
{ ti`z:8n7  
 BOOL bAdded=FALSE; m589C+7  
 for(int index=0;index<MAX_KEY;index++){ )cUc}Avg}  
  if(hCallWnd[index]==0){ bNFX+GA/  
   hCallWnd[index]=hWnd; &Km?(%?  
   HotKey[index]=cKey; c<A@Op"A  
   HotKeyMask[index]=cMask; \qUmdN{FU  
   bAdded=TRUE; b&*^\hY9b  
   KeyCount++; NqkRR$O  
   break; ?qHW"0Tjn  
  } _R8)%<E  
 } :&2RV_$>=  
 return bAdded; .o:Pe2C  
} QP7EPaW  
//删除热键 s8WA@)L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z/F(z*'v  
{ QD+dP nZu  
 BOOL bRemoved=FALSE; w<J$12 "p+  
 for(int index=0;index<MAX_KEY;index++){ 2(5wFc  
  if(hCallWnd[index]==hWnd){ `2J6Dz"W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `;hsOfo  
    hCallWnd[index]=NULL; oE"!  
    HotKey[index]=0; _Y|k \|'  
    HotKeyMask[index]=0; )}~k7bb}Y  
    bRemoved=TRUE; NX@TWBn%  
    KeyCount--; .m;1V6  
    break; WQv~<]1J F  
   } @-kzSm  
  } iq5h[  
 } +m:U9K(\h  
 return bRemoved; !b rN)b)f  
} =XQ3sk6U  
n6O1\}YB  
P;MS%32  
  DLL中的钩子函数如下: HpDU:m  
zST# X}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %Q1v8l.}  
{ R@=ve %a-  
 BOOL bProcessed=FALSE; Rk"VFe>r  
 if(HC_ACTION==nCode) [jD O8n/  
 { #ZCgpg$wM  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 67 7p9{:  
   switch(wParam) 0w8Id . ,  
   {  <rRm bFH#  
    case VK_MENU: 15iCJ p  
     MaskBits&=~ALTBIT; >kz5azV0  
     break; e~'y%|D  
    case VK_CONTROL: 2i |wQU5w  
     MaskBits&=~CTRLBIT; 9{70l539  
     break; /-^gK^  
    case VK_SHIFT: W E|L{  
     MaskBits&=~SHIFTBIT; fS1N(RZ 1  
     break; y"cK@sOo  
    default: //judge the key and send message `Wn0v2@a(~  
     break; Ea!}r| ~]0  
   } #8;^ys1f  
   for(int index=0;index<MAX_KEY;index++){ tI*u"%#t  
    if(hCallWnd[index]==NULL) >|6[uKrO  
     continue; Y'Wj7P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _#f/VE  
    { q,aWF5m@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `r_qvrC  
     bProcessed=TRUE; iBN,YPo~  
    } 9^v|~f  
   } "Z &qOQg%3  
  } ^yy\CtG  
  else if((lParam&0xc000ffff)==1){ //有键按下 O4 \GL  
   switch(wParam) |rW}s+Kcr  
   { "SLN8x49(  
    case VK_MENU: w]tv<U={  
     MaskBits|=ALTBIT; Eqp?cKrji  
     break; u$t*jw\fHg  
    case VK_CONTROL: LP@Q8{'  
     MaskBits|=CTRLBIT; XXuU@G6Z7$  
     break; cX7xG U  
    case VK_SHIFT: L.U [eH  
     MaskBits|=SHIFTBIT; gWy 2$)  
     break; 87~. |nu  
    default: //judge the key and send message ]hF[f|V  
     break; a=p3oh?%-O  
   } pUwx`"DrR  
   for(int index=0;index<MAX_KEY;index++){ MA(\ r  
    if(hCallWnd[index]==NULL) wA.YEI|CSj  
     continue; 4)JrOe&k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (LL4V 3)  
    { n@T4z.*~lA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m`nv4i#o  
     bProcessed=TRUE; u\Fq\_  
    } _m3PAD4  
   } s,K @t_J  
  } (mt,:hX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [g=yuVXNZZ  
   for(int index=0;index<MAX_KEY;index++){ }4cLU.L8O  
    if(hCallWnd[index]==NULL) U g]6i+rp  
     continue; d";+8S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cFGP3Q4{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !uO|1b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ywr^uy1V,/  
   } +Y)rv6}m  
  } J24UUZ9&$  
 } H&mw!=FV0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ReZ|q5*  
} "E/F{6NH  
wF?THkdFo  
  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: TL]2{rf~  
>/1.VT\E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "JJ )w0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aODOc J N  
qFe|$rVVIl  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 1@CI7j  
?Q9/C|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :'1ePq  
{ hJhdHy=U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) FK@rZP  
 { j\@s pbE@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iknBc-TLD  
  SaveBmp(); )3h=V^rm  
  return FALSE; hd/5*C{s  
 } qIA!m .GC  
 …… //其它处理及默认处理 f IQ$a >  
} !?O:%QG  
z[z'.{;D  
p*#SSR9<  
  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。 [7|}h/  
;op+~@*!  
  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。 qO&:J\d  
?v8RY,Q30  
  二、编程步骤 -Zocu<Rs  
RX?Nv4-  
  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"; Zp- Av8  
g 4Vt"2|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1swh7  
/~J#c=  
  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; 0/{-X[z  
aJI>qk h?]  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /A|ofAr)  
"^22 Y}VB  
  5、 添加代码,编译运行程序。 ;\4}Hcg  
5xTm]  
三、程序代码 _V-@95fK  
;[g v-H  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +Nc|cj  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?P{C=Td2z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ N5%~~JRO  
#if _MSC_VER > 1000 EJdq"6S  
#pragma once 3"I 1'+  
#endif // _MSC_VER > 1000 Tk.MtIs)V}  
#ifndef __AFXWIN_H__ Q}\,7l  
#error include 'stdafx.h' before including this file for PCH 7 &GhJ^Ku  
#endif pfZn<n5p  
#include "resource.h" // main symbols 6S"bW)O  
class CHookApp : public CWinApp =*"Amd,  
{ uW Q`  
 public: wqA5GK>m2  
  CHookApp(); )ckx&e  
  // Overrides &[R&@l Y  
  // ClassWizard generated virtual function overrides ( 5_oH  
  //{{AFX_VIRTUAL(CHookApp) AWD &K!  
 public: ={={ W  
  virtual BOOL InitInstance(); vQu) uml  
  virtual int ExitInstance(); tQo"$ JN}  
  //}}AFX_VIRTUAL W=I%3F_C"R  
  //{{AFX_MSG(CHookApp) oUltr  
  // NOTE - the ClassWizard will add and remove member functions here. :T%,.sH  
  // DO NOT EDIT what you see in these blocks of generated code ! n9cWvy&f  
  //}}AFX_MSG -}4H'%Z(i  
  DECLARE_MESSAGE_MAP() Yk?ux Z4)H  
}; e!eWwC9u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rLh490@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cX *  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "pMXTRb  
BOOL InitHotkey(); .N/4+[2p(  
BOOL UnInit(); u+8_et5T  
#endif R;I}#b cJ  
6<rc]T'|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "i_tO+  
#include "stdafx.h" iLv"ZqGrw  
#include "hook.h" ^4 es  
#include <windowsx.h> 5>h2WL  
#ifdef _DEBUG //H+S q66  
#define new DEBUG_NEW _or$^.='  
#undef THIS_FILE -?LSw  
static char THIS_FILE[] = __FILE__; Z#7HuAF{]  
#endif +1h^9 Y'  
#define MAX_KEY 100 bTHJbpt*-  
#define CTRLBIT 0x04 GN=F-*2  
#define ALTBIT 0x02 ?em)om  
#define SHIFTBIT 0x01 <KHB/7  
#pragma data_seg("shareddata") O}IS{/^7  
HHOOK hHook =NULL; bsqoR8  
UINT nHookCount =0; Q6Jb]>g\H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey G!0|ocE}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O}#*U+j  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M 80Us.  
static int KeyCount =0; iDHmS6_c  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r)U9u 0  
#pragma data_seg() ;#r tV;  
HINSTANCE hins; `z+:Z>>  
void VerifyWindow(); U?xl%qF`)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G>#L  
//{{AFX_MSG_MAP(CHookApp) k E6\G}zj  
// NOTE - the ClassWizard will add and remove mapping macros here. g\ <Lb  
// DO NOT EDIT what you see in these blocks of generated code! ^9cqT2:t  
//}}AFX_MSG_MAP {Z-5  
END_MESSAGE_MAP() tC|5;'m.2  
IO v4Zx<)  
CHookApp::CHookApp() G@,qO#5&  
{ Lc<Gn y^  
 // TODO: add construction code here, F!zZIaB]  
 // Place all significant initialization in InitInstance ,aawtdt/  
} Ix1ec^?f  
Zh3]bg5  
CHookApp theApp; LNg[fF^:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }c&Zv#iO6  
{ $5il]D`  
 BOOL bProcessed=FALSE; }"q1B  
 if(HC_ACTION==nCode) 0qR;Z{k  
 { H~x0-q<8  
  if((lParam&0xc0000000)==0xc0000000){// Key up I>9rfmmTI  
   switch(wParam) ;YK^&!N  
   { 6@Eip[e  
    case VK_MENU: v6oZD;;~  
     MaskBits&=~ALTBIT; Dk ]Y\:  
     break; -#)xe W.d  
    case VK_CONTROL: p9l&K/  
     MaskBits&=~CTRLBIT; K;[V`)d'  
     break; XUW~8P  
    case VK_SHIFT: n6|}^O7  
     MaskBits&=~SHIFTBIT; r}*2~;:pW  
     break; 9H.E15B  
    default: //judge the key and send message Z)6bqU<LQE  
     break; $Fd9iJ!k  
   } H Qf[T@  
   for(int index=0;index<MAX_KEY;index++){ .bL{fBTT~  
    if(hCallWnd[index]==NULL) LR9dQ=fHS  
     continue; T(ponLh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `33h4G  
    { %o^'(L@z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6pr}A  
     bProcessed=TRUE; OaU$ [Z'8  
    } &?zJ|7rh@|  
   } @iWIgL  
  } Q#:,s8TW[  
  else if((lParam&0xc000ffff)==1){ //Key down To=1B`@-  
   switch(wParam) v]_{oj_(-  
   { +=O8t0y n  
    case VK_MENU: rl4daV&,U  
     MaskBits|=ALTBIT; v,p/r )E  
     break; vQBfT% &Q-  
    case VK_CONTROL: WdIr 3  
     MaskBits|=CTRLBIT; hnE@+(d=qJ  
     break;  $7|0{Dw  
    case VK_SHIFT: #kma)_X  
     MaskBits|=SHIFTBIT; j g$%WAEb  
     break; >@T ZYdl  
    default: //judge the key and send message V=E9*$b]  
     break; #a}fI  
   } =A=er1~%  
   for(int index=0;index<MAX_KEY;index++) c*1B*_08  
   { 3(FJ<,"D}  
    if(hCallWnd[index]==NULL) 7%)4cHZ^$?  
     continue; 0YIvE\-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )(75dUl  
    { 7b'XQ/rs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `n5|4yaG~  
     bProcessed=TRUE; "p$`CUtI  
    } ] J:^$]  
   } hnG'L*HooE  
  } Z;??j+`Eo  
  if(!bProcessed){ 9>%f99n  
   for(int index=0;index<MAX_KEY;index++){ v*3ezf\  
    if(hCallWnd[index]==NULL) Lxd*W2$3_  
     continue; {f3T !e{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lBPZB%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t0}3QGf;c  
   } 5 QMu=/  
  } dw Aju:-H  
 } i:{a-Bd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y.Gr(]tk  
} tr/S*0$  
KY4|C05 ,  
BOOL InitHotkey() atW;S99#  
{ f4X?\eGT  
 if(hHook!=NULL){ })T_D\2M  
  nHookCount++; xmq~:fcU=  
  return TRUE; ^*}L9Ot~  
 } M^+~r,D1u  
 else = #ocp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8 +uOYNXsA  
  if(hHook!=NULL) H#wn3O  
   nHookCount++; Ld+}T"Z&M>  
  return (hHook!=NULL); pBmacFP  
} Mb?6c y[  
BOOL UnInit() Eiz\Nb  
{ (x?A#o>%  
 if(nHookCount>1){ $IB@|n  
  nHookCount--; rq2XFSXn  
  return TRUE; nm\n\j~  
 } { -<h5_h@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &\c$s  
 if(unhooked==TRUE){ JUwP<C[  
  nHookCount=0; hDVD@b  
  hHook=NULL; ("H:T?4Qs  
 } {b]WLBy  
 return unhooked; T6AFwo,Q  
} Jq?ai8  
##R]$-<4dQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ct"h.rD]  
{ 8+gSn  
 BOOL bAdded=FALSE; o+6Y/6Xp@  
 for(int index=0;index<MAX_KEY;index++){ #4d 0/28b  
  if(hCallWnd[index]==0){ B.{0,b W?  
   hCallWnd[index]=hWnd; %{o5 }TqD  
   HotKey[index]=cKey; ?^,GaZ^V  
   HotKeyMask[index]=cMask; M# S:'WN  
   bAdded=TRUE; gEPCXf  
   KeyCount++; <lv:mqV  
   break; J+Y&a&j.  
  } 9$#2+G!J  
 } \N/T^,  
 return bAdded; -FE5sW  
} EeL~`$f  
7J0 PO}N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &=_YL  
{ lc[\ S4  
 BOOL bRemoved=FALSE; :@YZ6?hf  
 for(int index=0;index<MAX_KEY;index++){ sowkxw.^Q  
  if(hCallWnd[index]==hWnd){ iCz,|;w%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dR $@vDm  
    hCallWnd[index]=NULL; |%b'L.$4  
    HotKey[index]=0; *:GoS?Ma  
    HotKeyMask[index]=0; MPM_/dn-  
    bRemoved=TRUE; X0P<ifIv  
    KeyCount--; C]eb=rw$  
    break; P#76ehR]K  
   } shP,-Vs #  
  } (QqKttL:  
 } =BNmuAY7  
 return bRemoved; #l{qb]n]  
} *-` /A  
m#'u;GP]k  
void VerifyWindow() ii{5z;I]X  
{ ,X9Y/S l  
 for(int i=0;i<MAX_KEY;i++){ CX\# |Q8q  
  if(hCallWnd!=NULL){ LTFA2X&E=  
   if(!IsWindow(hCallWnd)){ y{"8VT)  
    hCallWnd=NULL; :c<C;.  
    HotKey=0; mezP"N=L~  
    HotKeyMask=0; qj=12;  
    KeyCount--; C2DNyMu  
   } W}JJaZR*X  
  } njvmf*A?S  
 } 'B6D&xn'%&  
} O+z-6:`  
%Z.>)R4  
BOOL CHookApp::InitInstance() cl14FrpYu  
{ ?XW+&!ar  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3}Uae#oy  
 hins=AfxGetInstanceHandle(); HLTz|P0JZ  
 InitHotkey(); 2Ni2Gkf@  
 return CWinApp::InitInstance(); =}_c=z?UY  
} uXtfP?3Vy  
=C5 [75z#+  
int CHookApp::ExitInstance() h:j-Xd$H+  
{ nD E5A  
 VerifyWindow(); T>W(Caelq  
 UnInit(); tAYu|\]  
 return CWinApp::ExitInstance(); fZXd<Fg+  
} @HaWd 3  
2u#{K9g  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +O9l@X$l=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X @r5^A[9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ QWfwoe&;R:  
#if _MSC_VER > 1000 rpy`Wz/[  
#pragma once Q_M2!qj  
#endif // _MSC_VER > 1000 *>Om3[D  
Z1OX9]##r  
class CCaptureDlg : public CDialog -XD\,y%zi  
{ Q7`zrCh  
 // Construction .8fOc.h8h  
 public: W 6~<7  
  BOOL bTray; ou96 P<B  
  BOOL bRegistered; N tg#-_]  
  BOOL RegisterHotkey(); 0^{zq|%Q!  
  UCHAR cKey; M!mTNIj8~  
  UCHAR cMask; A5 8i}G9  
  void DeleteIcon(); z?FZu,h}  
  void AddIcon(); `p'L3u5H-  
  UINT nCount; Y5Ey%M m6  
  void SaveBmp(); M> 1V3 sM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor b%T-nY2  
  // Dialog Data @{XN}tWDOp  
  //{{AFX_DATA(CCaptureDlg) (7-K4j`   
  enum { IDD = IDD_CAPTURE_DIALOG }; QAcvv 0Hv  
  CComboBox m_Key; #`}g?6VHo  
  BOOL m_bControl; P,tN;c  
  BOOL m_bAlt; $?I ^Dk  
  BOOL m_bShift; 6S ]GSS<  
  CString m_Path; [yjC@docH  
  CString m_Number; iY.~N#Q  
  //}}AFX_DATA `M"b L|[R  
  // ClassWizard generated virtual function overrides p 4(-  
  //{{AFX_VIRTUAL(CCaptureDlg) r|rV1<d  
 public: cC WOG d  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -hhE`Y  
 protected: E39:}_IV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >-+MWu=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); lL%7lO   
  //}}AFX_VIRTUAL G{ F>=z"(l  
  // Implementation r_ r+&4n  
 protected: 2c9@n9Vx3a  
  HICON m_hIcon; {zmo7~=  
  // Generated message map functions ed*=p l3.  
  //{{AFX_MSG(CCaptureDlg) =ngu*#?c4  
  virtual BOOL OnInitDialog(); ^<sX^V+{  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f~W.i]  
  afx_msg void OnPaint();  '6 w|z^  
  afx_msg HCURSOR OnQueryDragIcon(); zCPjuS/~ Q  
  virtual void OnCancel(); 1NJ*EzJ~?  
  afx_msg void OnAbout(); Ya\G/R  
  afx_msg void OnBrowse(); _%<7!|"  
  afx_msg void OnChange(); b*.)m  
 //}}AFX_MSG #v~zf@<KLB  
 DECLARE_MESSAGE_MAP() |!IJ/ivEgw  
}; L{ .r8wSrI  
#endif 9YB~1 M  
\^':(Gu4o  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7+=j]+O  
#include "stdafx.h" MS,H12h  
#include "Capture.h" bYG}CO  
#include "CaptureDlg.h" Rra(/j<rQ  
#include <windowsx.h> nb?bx{M  
#pragma comment(lib,"hook.lib") 4+l7v?:Pr  
#ifdef _DEBUG 1~Pht:,t  
#define new DEBUG_NEW REFisH-  
#undef THIS_FILE ls #O0  
static char THIS_FILE[] = __FILE__; '[Nu;(>a  
#endif .%~ L  
#define IDM_SHELL WM_USER+1 dbnH#0i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <8-I:o]mF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I|iI ,l/9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; swlxV@NQ  
class CAboutDlg : public CDialog f ( UcJx  
{ Fi*6ud\n!  
 public: r@s, cCK9?  
  CAboutDlg(); Uc7X)  
  // Dialog Data li NPXS+  
  //{{AFX_DATA(CAboutDlg) H]@Zp"7  
  enum { IDD = IDD_ABOUTBOX }; (m.]0v*&c  
  //}}AFX_DATA b/ZX}<s(1=  
  // ClassWizard generated virtual function overrides :(I)+;M}P  
  //{{AFX_VIRTUAL(CAboutDlg) @JN%P} 4)  
 protected: )t)tk=R9N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dqd Qt_  
  //}}AFX_VIRTUAL B%'Np7  
  // Implementation mc9$"  
 protected: <-FZ-asem  
  //{{AFX_MSG(CAboutDlg) kC LeHH|K  
  //}}AFX_MSG j|+B|   
  DECLARE_MESSAGE_MAP() r("7 X2f  
}; Wy4v~]xd%  
~zYp(#0op  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 'HOcK8}b  
{ E*RP8  
 //{{AFX_DATA_INIT(CAboutDlg) 1d-j_ H`s  
 //}}AFX_DATA_INIT PB }$.8  
} -Ca.:zX  
;5y!,OF6  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5]'iSrp  
{ n7{1m$/  
 CDialog::DoDataExchange(pDX); !kmo% +  
 //{{AFX_DATA_MAP(CAboutDlg) (v(_ XlMK  
 //}}AFX_DATA_MAP `bt]v$  
} zxwpS  
A3 j>R477A  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5{cAawU.  
 //{{AFX_MSG_MAP(CAboutDlg) qZ8lU   
 // No message handlers rV2}> k  
 //}}AFX_MSG_MAP n,xK7icYNQ  
END_MESSAGE_MAP() 1l1X1  
vLpE|QZs  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /dWuHS  
: CDialog(CCaptureDlg::IDD, pParent) j}h50*6KO  
{ a&Z|3+ZA  
 //{{AFX_DATA_INIT(CCaptureDlg) m=%W<8[V  
  m_bControl = FALSE; 94K ;=5h  
  m_bAlt = FALSE; (y(V,kXwa8  
  m_bShift = FALSE; TXrC5AJx  
  m_Path = _T("c:\\"); ](8XC_-U'  
  m_Number = _T("0 picture captured."); QW~o+N~~  
  nCount=0; N#ex2c  
  bRegistered=FALSE; EH4WR/x  
  bTray=FALSE; :_^9.`  
 //}}AFX_DATA_INIT %J+$p\c  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "gK2!N|#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); YZ*Si3L   
} 1X#`NUJ?2  
w8@MUz}/#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) XtQ3$0{*%  
{ uiiA)j*!  
 CDialog::DoDataExchange(pDX);  JTz1M~  
 //{{AFX_DATA_MAP(CCaptureDlg) @&h<jM{D  
  DDX_Control(pDX, IDC_KEY, m_Key); 0*tEuJ7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); * z{D}L-&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); S6]D;c8GE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 's&Vg09D,  
  DDX_Text(pDX, IDC_PATH, m_Path); 3&2,[G04  
  DDX_Text(pDX, IDC_NUMBER, m_Number); U ][.ioc  
 //}}AFX_DATA_MAP bF B;N+>  
} xn6E f"  
QjZ}*p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NWoZDsu  
//{{AFX_MSG_MAP(CCaptureDlg) +S3'ms  
 ON_WM_SYSCOMMAND() XP{ nf9&  
 ON_WM_PAINT() ;gW~+hW^  
 ON_WM_QUERYDRAGICON() {P = {)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ybYSz@7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) MTLcLmdO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) v,>q]! |a  
//}}AFX_MSG_MAP br'~SXl  
END_MESSAGE_MAP() RA\H?1;8C  
e3(0L I  
BOOL CCaptureDlg::OnInitDialog() n,AN&BZ  
{ ^//N-?Fx  
 CDialog::OnInitDialog(); u2Rmp4]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (:[><-h.  
 ASSERT(IDM_ABOUTBOX < 0xF000); T-<^mX[}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;$|+H"g|  
 if (pSysMenu != NULL) -u8@ .  
 { ?B h}  
  CString strAboutMenu; ~t#'X8.)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [r]USCq  
  if (!strAboutMenu.IsEmpty()) 9Ft)VX  
  { 59EAqz[:  
   pSysMenu->AppendMenu(MF_SEPARATOR); o'H$g%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); FWD9!M K  
  } )hQ`l d7B  
 } mTs[3opg  
 SetIcon(m_hIcon, TRUE); // Set big icon ^[ id8  
 SetIcon(m_hIcon, FALSE); // Set small icon 4|XE f,  
 m_Key.SetCurSel(0); hs/nM"V  
 RegisterHotkey(); +x+H(of.  
 CMenu* pMenu=GetSystemMenu(FALSE); "bw4 {pa+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m6 IZG l7%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); kSI,Q!e\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j l7e6#zu  
 return TRUE; // return TRUE unless you set the focus to a control M5%xp.B  
} wvUph[j}J  
"CZ`hx1|^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `qfVgT=2  
{ jj.yB#T  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >,~JQ%1  
 { xJO[pT v  
  CAboutDlg dlgAbout; G`)I _uO  
  dlgAbout.DoModal(); _xmM~q[c7p  
 } ]-ZD;kOr  
 else y:W$~<E`p  
 { bk>M4l61  
  CDialog::OnSysCommand(nID, lParam); w5&UG/z%l  
 } q.g!WLiI  
} M8g=t[\  
*XNvb ^<  
void CCaptureDlg::OnPaint() MJ7!f+!5  
{ J@R+t6$3O  
 if (IsIconic()) SSH/q/  
 { 8:0l5cZE  
  CPaintDC dc(this); // device context for painting /}M@MbGMM  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Rf8|-G-}#  
  // Center icon in client rectangle H5qa7JMZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); \k g2pF[V  
  int cyIcon = GetSystemMetrics(SM_CYICON); J 0s8vAs  
  CRect rect; p*dez!  
  GetClientRect(&rect); 3Um\?fj>}(  
  int x = (rect.Width() - cxIcon + 1) / 2; o >W}1_  
  int y = (rect.Height() - cyIcon + 1) / 2; ?j $z[_K  
  // Draw the icon ,q:6[~n  
  dc.DrawIcon(x, y, m_hIcon); : ;d&m  
 } #s]]\  
 else #}B~V3UD  
 { KIuYWr7&  
  CDialog::OnPaint(); rW1 > t+  
 } \!631FcQ   
} :jUd?(  
%n-LDn  
HCURSOR CCaptureDlg::OnQueryDragIcon() yyiZV\ /  
{ [F6=JZ  
 return (HCURSOR) m_hIcon; @B1rtw6  
} 5))?,YkrrI  
|5Z@7  
void CCaptureDlg::OnCancel() ff{ESFtD  
{ #b{otc)  
 if(bTray) LoTq2/  
  DeleteIcon(); GLk7# Y  
  CDialog::OnCancel(); 3S.rIai+  
} .j;My%)?p  
us5`?XeX]  
void CCaptureDlg::OnAbout() O'!k$iJNb  
{ CBO8^M<K  
 CAboutDlg dlg; #" f:m`  
 dlg.DoModal(); |1t30_ /gS  
} WQ6E8t)  
bggSYhJ?\#  
void CCaptureDlg::OnBrowse() os#j;C]l  
{ r]8B6iV  
 CString str; 4RdpROK  
 BROWSEINFO bi; B8;ZOLAU  
 char name[MAX_PATH]; 1{u;-pg  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qOk4qbl[  
 bi.hwndOwner=GetSafeHwnd(); 2{&|%1Jg  
 bi.pszDisplayName=name; IG#=}q  
 bi.lpszTitle="Select folder"; g\X"E>X  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; R;,&CQUl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); rl6vt*g  
 if(idl==NULL) VT+GmS  
  return; i{ %~&!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); f\|33)k  
 str.ReleaseBuffer(); GR|Vwxs<@P  
 m_Path=str; p 6jR,m8S  
 if(str.GetAt(str.GetLength()-1)!='\\') i:W oT4  
  m_Path+="\\"; YF."D%?  
 UpdateData(FALSE); K=!J=R;  
} G\Sd!'?p  
|e+I5  
void CCaptureDlg::SaveBmp() 46$u}"E  
{ S Xgpj  
 CDC dc; <QszmE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fHwh6|  
 CBitmap bm; ;9;.!4g/T  
 int Width=GetSystemMetrics(SM_CXSCREEN); [KCh,'&  
 int Height=GetSystemMetrics(SM_CYSCREEN); (:@qn+ a  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2{{M{#}S.  
 CDC tdc; C~6aX/:  
 tdc.CreateCompatibleDC(&dc); [*50Ng>P`  
 CBitmap*pOld=tdc.SelectObject(&bm); v[HxO?x^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .8wR;^  
 tdc.SelectObject(pOld); *rW]HNz  
 BITMAP btm; ko  ~iDT  
 bm.GetBitmap(&btm); } |sP;Rpu  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *D`,z3/*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~L4"t_-  
 BITMAPINFOHEADER bih; ?(ks=rRK  
 bih.biBitCount=btm.bmBitsPixel; m6g+ B>  
 bih.biClrImportant=0; |!&,etu  
 bih.biClrUsed=0; ~1}NQa(  
 bih.biCompression=0; vwP516EM  
 bih.biHeight=btm.bmHeight; Zso .3FR,  
 bih.biPlanes=1; EB>laZy>  
 bih.biSize=sizeof(BITMAPINFOHEADER); >~XX'}  
 bih.biSizeImage=size; '+-R 7#  
 bih.biWidth=btm.bmWidth; yqCy`TK8  
 bih.biXPelsPerMeter=0; y.mojx%?a  
 bih.biYPelsPerMeter=0; />+JK5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^DIN(0u)  
 static int filecount=0; }g(aZ  
 CString name; ?#]c{Tlpz  
 name.Format("pict%04d.bmp",filecount++); >5]Xl*{H)  
 name=m_Path+name; vA+RZ  
 BITMAPFILEHEADER bfh; `W|2Xi=^5  
 bfh.bfReserved1=bfh.bfReserved2=0; +IJpqFH  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /&ph-4\i  
 bfh.bfSize=54+size; A$|> Jt  
 bfh.bfOffBits=54; Npq=jlj  
 CFile bf; ]c$%;!ZE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6bfk4k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zwAuF%U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); YS~\Gls%  
  bf.WriteHuge(lpData,size); !y*V;J  
  bf.Close(); "hQV\|!\  
  nCount++; v*#Z{)r  
 } )vy<q/o+  
 GlobalFreePtr(lpData); O|av(F9  
 if(nCount==1) <!=TxV>}A  
  m_Number.Format("%d picture captured.",nCount); U>X06T  
 else <2,@rYe/  
  m_Number.Format("%d pictures captured.",nCount); d6(qc< /!r  
  UpdateData(FALSE); IO,kP`Wcx  
} 36lIV,YnU  
m,=$a\UC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) yP[GU| >(  
{ (U-p&q>z  
 if(pMsg -> message == WM_KEYDOWN) hWDgMmo7  
 { PqvwM2}4  
  if(pMsg -> wParam == VK_ESCAPE) $aGK8%.O  
   return TRUE; 5%G++oLXf  
  if(pMsg -> wParam == VK_RETURN) $\a;?>WA"  
   return TRUE; Bt.W_p  
 } =U@*adgw  
 return CDialog::PreTranslateMessage(pMsg); U7:~@eYy  
} y@hdN=-  
A7: oq7b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *~fN^{B'!  
{ 4e*0kItC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %zX'u.}8#  
  SaveBmp(); )rj.WK.  
  return FALSE; f1\x>W4z~\  
} n1$##=wK]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R HF;AX n  
 CMenu pop; Yh"Z@D[d  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9Z#37)  
 CMenu*pMenu=pop.GetSubMenu(0); RRq*CLj  
 pMenu->SetDefaultItem(ID_EXITICON); EB\z:n5  
 CPoint pt; WqTW@-}ID  
 GetCursorPos(&pt); Q~*A`h#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ((X"D/F]  
 if(id==ID_EXITICON) MTqbQ69v  
  DeleteIcon(); %DRDe  
 else if(id==ID_EXIT) Ppx*  
  OnCancel(); ~2"|4  
 return FALSE; vtvr{Uqo@  
} H|,{^b@9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A.<X78!^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) SSI&WZ2a  
 AddIcon(); fM2[wh@  
 return res; bfa5X<8  
} S - 7JDE>  
DJ<e=F!  
void CCaptureDlg::AddIcon() kXG+zsT  
{ ^,`Lt *  
 NOTIFYICONDATA data; OU{PVF={   
 data.cbSize=sizeof(NOTIFYICONDATA); 9jvg[ H  
 CString tip; :0srFg?X  
 tip.LoadString(IDS_ICONTIP); e3[QM  
 data.hIcon=GetIcon(0); W>@+H"pZ  
 data.hWnd=GetSafeHwnd(); =`/X Wem  
 strcpy(data.szTip,tip); eyo)Su  
 data.uCallbackMessage=IDM_SHELL; iPkG=*Ip(%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ] c'owj  
 data.uID=98; *|`'L  
 Shell_NotifyIcon(NIM_ADD,&data); X;}_[ =-  
 ShowWindow(SW_HIDE); sI^1c$sBN  
 bTray=TRUE; Ex*g>~e  
} =%RDT9T.  
1pz6e8p:m  
void CCaptureDlg::DeleteIcon() gi"v$ {R  
{ 4CN8>J'-  
 NOTIFYICONDATA data; zu;Yw=cM)  
 data.cbSize=sizeof(NOTIFYICONDATA); ^_<pc|1  
 data.hWnd=GetSafeHwnd(); />n0&~k[h  
 data.uID=98; E!Ng=}G&_  
 Shell_NotifyIcon(NIM_DELETE,&data); 33u7  
 ShowWindow(SW_SHOW); QZwRg&d<o  
 SetForegroundWindow(); }D=h"\_=  
 ShowWindow(SW_SHOWNORMAL); `Cb$8;)z  
 bTray=FALSE; -(1e!5_-@  
} ltD:w{PO]  
,2?C^gxt  
void CCaptureDlg::OnChange() }  g  
{ #}jf TM  
 RegisterHotkey(); x K_$^c.  
} :z"Uw*  
E8-p ,e,  
BOOL CCaptureDlg::RegisterHotkey() "#m*`n  
{ zZE?G:isR  
 UpdateData(); -R\}Q"  
 UCHAR mask=0; )s^XVs.-  
 UCHAR key=0; L\"=H4r  
 if(m_bControl) s5z@`M5'm  
  mask|=4; :;|x'[JoE?  
 if(m_bAlt) a~{St v  
  mask|=2; 7,O^c +  
 if(m_bShift) oVsl,V  
  mask|=1; $[]=6.s  
  key=Key_Table[m_Key.GetCurSel()]; /\\C&Px  
 if(bRegistered){ cu""vtK   
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~S=hxKI  
  bRegistered=FALSE; fc\hQXYv  
 } g.9MPN  
 cMask=mask; wTTQIo 60  
 cKey=key; J7E/2Sl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gr-%9=Uq  
 return bRegistered; |]B]0J#_  
} $~9U-B\  
( NiuAy  
  四、小结 oYqC"g&4Z  
"\V:W%23W{  
  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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