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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: &]A0=h2{P*  
  kjOkPp  
  一、实现方法 1F+JyZK}w  
3BF3$_u)o  
  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: GNHWbC6_m  
!HP=Rgh  
#pragma data_seg("shareddata") S&D8Rao5  
HHOOK hHook =NULL; //钩子句柄 cJM.Q_I}Y  
UINT nHookCount =0; //挂接的程序数目 ^f,%dM=i=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9g.5:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7?);wh7`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey kE[R9RS!  
static int KeyCount =0; $H&:R&Us  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~]'yUd1gSZ  
#pragma data_seg() JBLh4c3  
:-(qqC:  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 8q:# '  
o*oFCR]j  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: VssWtL  
k-)Ls~#+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \: B))y?}d  
cKey,UCHAR cMask) fX>y^s?y  
{ aY6F4,7/B  
 BOOL bAdded=FALSE; )l`VE_(|  
 for(int index=0;index<MAX_KEY;index++){ e_cK#9+  
  if(hCallWnd[index]==0){ HuQdQ*Q  
   hCallWnd[index]=hWnd; 3UUN@Tx  
   HotKey[index]=cKey; WF2t{<]^e  
   HotKeyMask[index]=cMask; }XqC'z  
   bAdded=TRUE; ;<nJBZB9u  
   KeyCount++; y! QYdf?  
   break; P?zaut  
  } x@[6u  
 } _>8Q{N\- {  
 return bAdded; rd)W+W9  
} KleiX7  
//删除热键 MT$)A:"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q{yjIy/b  
{ yM,Y8^  
 BOOL bRemoved=FALSE; sa"}9IE*8  
 for(int index=0;index<MAX_KEY;index++){ X}g3[  
  if(hCallWnd[index]==hWnd){ )lq+Gv[%F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~qK/w0=j  
    hCallWnd[index]=NULL; 2IUd?i3~l  
    HotKey[index]=0; BO%'/2eV  
    HotKeyMask[index]=0; F07X9s44E  
    bRemoved=TRUE; ;V?d;O4u  
    KeyCount--; usC$NVdm  
    break; +oL@pp0  
   } bR8`Y(=F9b  
  } e*U6^Xex  
 } )V&hS5P=S  
 return bRemoved; |--Jd$ dj  
} 8;# yXlf  
l,zhBnD  
8)ng> l  
  DLL中的钩子函数如下: sV\K[4HG  
C7DwA/$D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Rz[3cN)?q  
{ e6^}XRyf  
 BOOL bProcessed=FALSE; Iga#,k+%  
 if(HC_ACTION==nCode) nd7g8P9p  
 { `*D"=5G+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 l@ (:Q!Sk  
   switch(wParam) D3%2O`9  
   {  M |f V7g  
    case VK_MENU: 0%4OmLBT  
     MaskBits&=~ALTBIT; D2=zrU3Y64  
     break;  WjCxTBI  
    case VK_CONTROL: < fV][W  
     MaskBits&=~CTRLBIT; q6<P\CSHy<  
     break; a6 1!j>Kx  
    case VK_SHIFT: o{^`Y   
     MaskBits&=~SHIFTBIT; KHgn  
     break; d ez4g  
    default: //judge the key and send message ]}p<P):hO  
     break; ge<D}6GQ  
   } ._Ww  
   for(int index=0;index<MAX_KEY;index++){ N"suR}9%  
    if(hCallWnd[index]==NULL) '2ZvK  
     continue; i'4.w?OZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R<(xWH  
    { 4 Tw~4b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >[;=c0(  
     bProcessed=TRUE; $*T?}r>  
    } >P&1or)e%  
   } 1@JusS0^K  
  } $EX(-!c  
  else if((lParam&0xc000ffff)==1){ //有键按下 _(I6o  
   switch(wParam) 7D4tuXUq2  
   { NzTF2ve(  
    case VK_MENU: i^V(LGQF  
     MaskBits|=ALTBIT; ODhq `?(N  
     break; xwi6#>  
    case VK_CONTROL: c+ByEP4EG  
     MaskBits|=CTRLBIT; :7mHPe }(  
     break; -a&<Un/  
    case VK_SHIFT: G$%F`R[  
     MaskBits|=SHIFTBIT; w6WPfy(/2  
     break; )%3T1 D/  
    default: //judge the key and send message j@ D,2B;  
     break; C4P<GtR9  
   } 0bT[05.  
   for(int index=0;index<MAX_KEY;index++){ KIag(!&  
    if(hCallWnd[index]==NULL) RjVmHhX  
     continue; |_>^vW1f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q=V'pML  
    { x!\q69ndv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q2uV/M1?  
     bProcessed=TRUE; 5j6`W?|q  
    } ~!!| #A)W  
   } f'H|K+bO  
  } >]z^.U7=  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M +r!63T  
   for(int index=0;index<MAX_KEY;index++){ : -d_  
    if(hCallWnd[index]==NULL) :dAd5v2f  
     continue; q!?*M?Oz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a6^_iSk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2vX $:4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8W?dWj  
   } 7t:tS7{}  
  } stBe ^C  
 } 13`Mt1R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |K06H ?6X  
} qq]Iy=  
>3Q|k{97  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y!.jpF'uI  
RZ xwr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =R|XFZ,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y`Io}h G$  
vIbM@Y4 '?  
  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: dK4rrO  
]L7A$sTUQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2R.L LE  
{ 5UO+c( T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KP>9hEh  
 { ^}B,0yUu'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }$4z$&  
  SaveBmp(); +8T^q,  
  return FALSE; v|o{AL:ei  
 } ~~Ezt*lH  
 …… //其它处理及默认处理 yi>A ogQ,  
} .  yg#  
Cl]?qH*:  
d6YXITL)\>  
  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。 2_+>a"8Y  
6 AGZ)gX  
  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。 hN &?x5aC>  
Bhd)# P  
  二、编程步骤 JHt U"  
y~@zfJ5/^  
  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"; EN2SI+  
vjlN@ "  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; '#Au~5  
_wS=*-fT  
  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; L2ydyXIsd  
#e|o"R;/`  
  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'{DKR  
D3X4@sM  
  5、 添加代码,编译运行程序。 L ,dh$F  
d*0 RBgn  
三、程序代码 VNHce H  
: ~vodh  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL At4\D+J{Vs  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1x:W 3.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \}s/<Q  
#if _MSC_VER > 1000 !i^"3!.l,]  
#pragma once d?2ORr|m=  
#endif // _MSC_VER > 1000 Cp6S2v I  
#ifndef __AFXWIN_H__ T8x)i\<  
#error include 'stdafx.h' before including this file for PCH Og/aTR<;=  
#endif $`E?=L`$  
#include "resource.h" // main symbols q[,p#uJ]  
class CHookApp : public CWinApp yu6{6 [  
{ 6*q1%rs:w  
 public: ^{4BcM7eH  
  CHookApp(); =cS&>MT  
  // Overrides jtP*C_Scv/  
  // ClassWizard generated virtual function overrides 10Ik_L='  
  //{{AFX_VIRTUAL(CHookApp) <\~v$=G  
 public: _SAM8!q4,  
  virtual BOOL InitInstance(); ,X4+i8Yc  
  virtual int ExitInstance(); [-])$~WfW  
  //}}AFX_VIRTUAL w={q@. g%  
  //{{AFX_MSG(CHookApp) z'EQdQ)  
  // NOTE - the ClassWizard will add and remove member functions here. c\{N:S>  
  // DO NOT EDIT what you see in these blocks of generated code ! +[!S[KE  
  //}}AFX_MSG ?,>3uD#  
  DECLARE_MESSAGE_MAP() lFjz*g2'  
}; dFy$w=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); s5nw<V9$]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -3{Q`@F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )!2@v@SQ  
BOOL InitHotkey(); kGYpJg9=  
BOOL UnInit(); 0Z1ksfLU  
#endif  ES~b f  
u}[ a  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q!y.cyL  
#include "stdafx.h" aDF@A S  
#include "hook.h" P}v ;d]  
#include <windowsx.h> u 2 s  
#ifdef _DEBUG ,t9EL 21  
#define new DEBUG_NEW @N4_){s*  
#undef THIS_FILE ws'e  
static char THIS_FILE[] = __FILE__; .Vbd-jr'M  
#endif n1."Qix0  
#define MAX_KEY 100 .SD-6GVD  
#define CTRLBIT 0x04 .\R9tt}  
#define ALTBIT 0x02 mWT+15\5r(  
#define SHIFTBIT 0x01 o5o myMN  
#pragma data_seg("shareddata") P%aqY~yF3  
HHOOK hHook =NULL; xsZG(Tz  
UINT nHookCount =0; e*7O!Z=O  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vB8$Qx\J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,|A^ <R`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SGWb*grt  
static int KeyCount =0; ]<;7ZNG"Y5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7g\v (P  
#pragma data_seg() MzIDeZ  
HINSTANCE hins; .G{cx=;  
void VerifyWindow(); 1<r!9x9G  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5whW>T  
//{{AFX_MSG_MAP(CHookApp) ,hn#DJ)  
// NOTE - the ClassWizard will add and remove mapping macros here.  XIInI  
// DO NOT EDIT what you see in these blocks of generated code! 7;EDU  
//}}AFX_MSG_MAP qUJ"* )S  
END_MESSAGE_MAP() ;g0Q_F@;p  
Q,3kaR@O  
CHookApp::CHookApp() ~ WWhCRq  
{ tvI<Why\p  
 // TODO: add construction code here, Ei!Z]jeK  
 // Place all significant initialization in InitInstance k&$ov  
} d&+]@ Ii  
& FhJ%JK  
CHookApp theApp; t1w5U+z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zZCl]cql  
{ >+M[!;m}  
 BOOL bProcessed=FALSE; FRQ.ix2  
 if(HC_ACTION==nCode) {-4+=7Sg1  
 { 9O;Sn+  
  if((lParam&0xc0000000)==0xc0000000){// Key up L7rgkxI7k*  
   switch(wParam) /wJ#-DZ  
   { & =[!L0{  
    case VK_MENU: @z1QoZ^w  
     MaskBits&=~ALTBIT; \zBi-GI7  
     break; <P h50s4  
    case VK_CONTROL: Wk%|%/:  
     MaskBits&=~CTRLBIT; I3Vu/&8f|  
     break; %1i:*~g  
    case VK_SHIFT: cq I $9  
     MaskBits&=~SHIFTBIT; 'nTlCYT  
     break; vi##E0,N'^  
    default: //judge the key and send message tWIOy6`  
     break; hEZvi   
   } *K/K97  
   for(int index=0;index<MAX_KEY;index++){ 5iA>Z!sP[  
    if(hCallWnd[index]==NULL) 50_[hC&C)  
     continue; l U/Xi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IC cr  
    { cGV%=N^BE<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KQf WpHwfj  
     bProcessed=TRUE; xuXPVJdi  
    } <XLae'R  
   } $g>bp<9v4  
  } syX?O'xJ  
  else if((lParam&0xc000ffff)==1){ //Key down DTezG':  
   switch(wParam) ~+\=X`y  
   { H$I~Vz[\yb  
    case VK_MENU: r2RJb6  
     MaskBits|=ALTBIT; * :L"#20:R  
     break; Z<X=00,wg  
    case VK_CONTROL: ~J].~^[  
     MaskBits|=CTRLBIT; #*iUZo  
     break; ~0PzRS^o  
    case VK_SHIFT: >$m<R &  
     MaskBits|=SHIFTBIT; _Raf7W  
     break; hz:7W8  
    default: //judge the key and send message KrGl}|  
     break; wpZ"B+oK!  
   } YS|Dw'%g /  
   for(int index=0;index<MAX_KEY;index++) $Tbsre\MJ  
   { 5;)^o3X>  
    if(hCallWnd[index]==NULL) S`s]zdUTP  
     continue; u9"kF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :rb;*nY!  
    { W8& )UtWQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 01mu6)  
     bProcessed=TRUE; 9k6s  
    } cO5F=ZxR  
   } );!ND %  
  } \TP$2i%W  
  if(!bProcessed){ Q:P)g#suc  
   for(int index=0;index<MAX_KEY;index++){ V(`]hH0;T  
    if(hCallWnd[index]==NULL) g (w/  
     continue; ?'k_K:_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n-9xfn0U~#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XM\\Imw  
   } }d%CZnY&7  
  } V lx.C~WYn  
 } }TTghE!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )BJkHED{  
} 6:8s,a3&[k  
GN_L"|#)=  
BOOL InitHotkey() FAM{p=t]HT  
{ Au2?f~#Fv  
 if(hHook!=NULL){ qx#M6\L!  
  nHookCount++; YrL(4 Nt8  
  return TRUE; UBL{3s^"  
 } Z1fY' f  
 else ()aCE^C  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); GQ1/pys  
  if(hHook!=NULL) e=&~6bs1U  
   nHookCount++; ~xqiasE#K  
  return (hHook!=NULL); &PJ;B)b  
} !.UE}^TV  
BOOL UnInit() $`lWW6>P  
{ W`x.qumN  
 if(nHookCount>1){ UNDl&C2vz  
  nHookCount--; p$,G`'l  
  return TRUE; }#s{."  
 } Rw'}>?k]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 8&EJ. CQ  
 if(unhooked==TRUE){ 3k'Bje?9~  
  nHookCount=0; [63\2{_^v  
  hHook=NULL; 4. R(`#f  
 } ,&BNN]k  
 return unhooked; +2iD9X{$MX  
} 1{N+B#*<[X  
.2%t3ul[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =AO (  
{ O|t>.<T?  
 BOOL bAdded=FALSE; mh8fJ6j29N  
 for(int index=0;index<MAX_KEY;index++){ aL:|Dr3SX  
  if(hCallWnd[index]==0){ T U6s~  
   hCallWnd[index]=hWnd; >5t! Xt  
   HotKey[index]=cKey; eWFkUjz  
   HotKeyMask[index]=cMask; XR..DVab  
   bAdded=TRUE; 4`8s]X  
   KeyCount++; Rrh6-]A  
   break; 4bk`i*-O  
  } [RXLR#  
 } Fv]6 a n.  
 return bAdded; uzH MQp  
} az ZtuDfv  
O84:ejro  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (G F}c\=T7  
{ ''auu4vF  
 BOOL bRemoved=FALSE; K/zb6=->  
 for(int index=0;index<MAX_KEY;index++){ zr!7*, p  
  if(hCallWnd[index]==hWnd){ OB.rETg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yBy7d!@2  
    hCallWnd[index]=NULL; _. 9 5>`  
    HotKey[index]=0; dU3A:uS^  
    HotKeyMask[index]=0; T^4 dHG-(  
    bRemoved=TRUE; ;B@#,6t/  
    KeyCount--; \:+\H0Bz  
    break; :!_l@=l  
   } 8gavcsVE[  
  } 0U7Gl9~  
 } [~8U],?1  
 return bRemoved; 'd2 :a2C]  
} -+[Lc_oNPx  
X| \`\[  
void VerifyWindow() :;_}Gxx  
{ B& @ pZYl  
 for(int i=0;i<MAX_KEY;i++){ 81E EYf  
  if(hCallWnd!=NULL){ ,f^fr&6jb  
   if(!IsWindow(hCallWnd)){ g)6>=Qo`8E  
    hCallWnd=NULL; (2eS:1+'8  
    HotKey=0; Z7bJ<TpZ  
    HotKeyMask=0; ?wHhBh-Q  
    KeyCount--; 85!]N F  
   } 7RDmvWd-'?  
  } H{n:R *  
 } no8\Oees  
} "_&ZRcd*  
Y$>NsgQn6  
BOOL CHookApp::InitInstance() <-.@,HQ+  
{ sl-wNIQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]r#b:W\  
 hins=AfxGetInstanceHandle(); D9TjjA|zS  
 InitHotkey(); Ja~8ZrcY  
 return CWinApp::InitInstance(); ; =n}61  
} =RHtugwy  
f_)#  
int CHookApp::ExitInstance() ng/h6 S  
{ ?;oJ=.T  
 VerifyWindow(); [z"E"_r~%Y  
 UnInit(); FaCW +9B  
 return CWinApp::ExitInstance(); ftpPrtaP  
} <cOjtq,0  
2FZ T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %T$>E7]!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |Ogh-<|<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ v)np.j0V7  
#if _MSC_VER > 1000 : j kO  
#pragma once [;Ih I  
#endif // _MSC_VER > 1000 iT:i '\~  
0 \ U*  
class CCaptureDlg : public CDialog +EjXoW7V  
{ zgz!"knVx  
 // Construction C[.Xi  
 public: -ysNo4#e&  
  BOOL bTray; AmC9qk8Q  
  BOOL bRegistered; Rd HCbk  
  BOOL RegisterHotkey(); p@O Ip  
  UCHAR cKey; :[+8(~| za  
  UCHAR cMask; 5eL b/,R  
  void DeleteIcon(); OIj.K@Kr  
  void AddIcon(); c*B< - l<5  
  UINT nCount; q)9n%- YgP  
  void SaveBmp(); ilQ}{p6I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L754odc  
  // Dialog Data =v^#MU{k?  
  //{{AFX_DATA(CCaptureDlg) U2?R&c;b  
  enum { IDD = IDD_CAPTURE_DIALOG }; eYP^.U)  
  CComboBox m_Key; 1K#[Ef4  
  BOOL m_bControl; ]VQd *~ -  
  BOOL m_bAlt; QY4;qA  
  BOOL m_bShift; X+sKG5nS  
  CString m_Path; K" VcPDK  
  CString m_Number; 9,~7,Py}  
  //}}AFX_DATA V*PL_|Q5  
  // ClassWizard generated virtual function overrides q 8sfG;)  
  //{{AFX_VIRTUAL(CCaptureDlg) ;<m*ASM.3  
 public: )EB+(c~E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -a@e28Y  
 protected: UFT JobU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6QA`u*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); OnE%D|Tq=  
  //}}AFX_VIRTUAL 'u x!:b"  
  // Implementation d'Bxi"K  
 protected: L!*+: L DL  
  HICON m_hIcon; }\S'oC\[  
  // Generated message map functions @Q,Q"c2  
  //{{AFX_MSG(CCaptureDlg) e(/F:ZEh  
  virtual BOOL OnInitDialog(); ;PC!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 66F?exr  
  afx_msg void OnPaint(); nS3Aadm  
  afx_msg HCURSOR OnQueryDragIcon(); V'{\g|)  
  virtual void OnCancel(); ,DE>:ARZ  
  afx_msg void OnAbout(); /;(ji?wN  
  afx_msg void OnBrowse(); XfE9QA[  
  afx_msg void OnChange(); 4 j=K3m  
 //}}AFX_MSG 9h6Oq(0b8  
 DECLARE_MESSAGE_MAP() bKmwXDv'  
}; 5\z<xpJ  
#endif 5z 0VMt  
7Q&-ObW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Kw`CN  
#include "stdafx.h" \X&8EW  
#include "Capture.h" 2rT^OGw6  
#include "CaptureDlg.h" -c]AS[(  
#include <windowsx.h> @~$"&B  
#pragma comment(lib,"hook.lib") gep#o$P  
#ifdef _DEBUG J6s]vV q"  
#define new DEBUG_NEW {,sqUq (  
#undef THIS_FILE *'{-!Y  
static char THIS_FILE[] = __FILE__; 0)Ephsw  
#endif k2v:F  
#define IDM_SHELL WM_USER+1 ?< b{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T8A(W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z5$Q"Y.D  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; u|t l@_  
class CAboutDlg : public CDialog a)ry}E =f  
{ 0pMN@Cz6  
 public: _|GbU1Hz  
  CAboutDlg(); ~i;{+j6Ho!  
  // Dialog Data P!|Z%H  
  //{{AFX_DATA(CAboutDlg) i WD|F-  
  enum { IDD = IDD_ABOUTBOX }; wUCxa>h'  
  //}}AFX_DATA [o#% Eg;  
  // ClassWizard generated virtual function overrides I2*rtVAP'j  
  //{{AFX_VIRTUAL(CAboutDlg) ~I5hV}ZT  
 protected: b&F9<XLqq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `RnWh9  
  //}}AFX_VIRTUAL Ldjz-  
  // Implementation t 6nRg  
 protected: 7tcadXk0  
  //{{AFX_MSG(CAboutDlg) pjFO0h_Y  
  //}}AFX_MSG ^MvuFA ,C  
  DECLARE_MESSAGE_MAP() EpAgKzVpJ  
}; d>hv-n D  
{zAI-?#*u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Zigv;}#  
{ )cJ>&g4]  
 //{{AFX_DATA_INIT(CAboutDlg) } jj)  
 //}}AFX_DATA_INIT YGyv)\  
} <PpvVDy3  
@zg}x0]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !B3TLe h  
{ Q>%n&;:  
 CDialog::DoDataExchange(pDX); GF ux?8A:%  
 //{{AFX_DATA_MAP(CAboutDlg) YqX$a~  
 //}}AFX_DATA_MAP &j 4pC$Dj  
} *V6| FU  
r9 @=d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) bT.q@oU  
 //{{AFX_MSG_MAP(CAboutDlg) h+ [6i{  
 // No message handlers O_:l;D#i  
 //}}AFX_MSG_MAP _nbr%PD,  
END_MESSAGE_MAP() q?(] Y*  
Yb+A{`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) OT{"C"%5t  
: CDialog(CCaptureDlg::IDD, pParent) *1dDs^D#|  
{ ~sk p}g]  
 //{{AFX_DATA_INIT(CCaptureDlg) v=N?(6T  
  m_bControl = FALSE; GDxv2^4  
  m_bAlt = FALSE; A8Ju+  
  m_bShift = FALSE; A0DGDr PD  
  m_Path = _T("c:\\"); /\8I l+0  
  m_Number = _T("0 picture captured."); T`EV uRJ  
  nCount=0; *|A QV:  
  bRegistered=FALSE; ;/K2h_=3z  
  bTray=FALSE; zU?O)w1'  
 //}}AFX_DATA_INIT /}?7Eni  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vx_33";S\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _M^.4H2  
} 5WQl?yMP  
kTvM,<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) D4=*yP  
{ X06Lr!-%  
 CDialog::DoDataExchange(pDX); I_J&>}V'  
 //{{AFX_DATA_MAP(CCaptureDlg) [*',pG  
  DDX_Control(pDX, IDC_KEY, m_Key); s6bsVAO>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bHwEd%f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); m^_=^z+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Jxe+LG  
  DDX_Text(pDX, IDC_PATH, m_Path); ~K;QdV=YX  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ":Dm/g  
 //}}AFX_DATA_MAP iQ)ydY a  
} W7>2&$  
+<7Oj s>o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =c[tHf  
//{{AFX_MSG_MAP(CCaptureDlg) Y9+_MxC"  
 ON_WM_SYSCOMMAND() S0,\{j  
 ON_WM_PAINT() HxG8 'G  
 ON_WM_QUERYDRAGICON() R?xb1yc7_  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `S {&gl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `geHSx_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @UD:zUT)F  
//}}AFX_MSG_MAP ~r--dU  
END_MESSAGE_MAP() W: ]FYC  
Ww7Ya]b.k  
BOOL CCaptureDlg::OnInitDialog() I~GF%$-G  
{ iM+` 7L'  
 CDialog::OnInitDialog(); =kd$??F  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9njl,Q:  
 ASSERT(IDM_ABOUTBOX < 0xF000); AcH-TIgM/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); H9cPtP~a)  
 if (pSysMenu != NULL) @]=40Yj~w  
 { WgtLKRZ\  
  CString strAboutMenu; <)VgGjZ-H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); f`9Mcli !  
  if (!strAboutMenu.IsEmpty()) V ;T :Q%  
  { A6&*VD  
   pSysMenu->AppendMenu(MF_SEPARATOR); /DYyl/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); X]0>0=^  
  } <L &EH@T  
 } * DL7p8  
 SetIcon(m_hIcon, TRUE); // Set big icon &k }f"TX2  
 SetIcon(m_hIcon, FALSE); // Set small icon "s+4!,k  
 m_Key.SetCurSel(0); r"7n2   
 RegisterHotkey(); 4DA34m(  
 CMenu* pMenu=GetSystemMenu(FALSE); ~^m Uu`@r  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [{x}# oRSE  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xnP!P2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V>{< pS  
 return TRUE; // return TRUE unless you set the focus to a control t[^$F,  
} ~3&{`9Y  
*3GV9'-P  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (f#(B2j  
{ =*mT{q@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~ Z\:Nx  
 { 8Lo#{`  
  CAboutDlg dlgAbout; f[^f/jGm  
  dlgAbout.DoModal(); %Sr+D{B  
 } G=zWhqieh  
 else =&HLz 7|  
 { J!I)G&:  
  CDialog::OnSysCommand(nID, lParam); %Tm*^  
 } G95,J/w  
} *ukyQZ9  
M^FY6TT4O  
void CCaptureDlg::OnPaint() 0 'QWa{dS\  
{ P15 H[<:Fz  
 if (IsIconic()) iG N\ >m}  
 { _fGTTw(  
  CPaintDC dc(this); // device context for painting cnv>&6a)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]-fkmnmWX  
  // Center icon in client rectangle S{@}ECla  
  int cxIcon = GetSystemMetrics(SM_CXICON); }U_ ' 7_JT  
  int cyIcon = GetSystemMetrics(SM_CYICON); k+3qX'fd  
  CRect rect; X#B b?Pv  
  GetClientRect(&rect); o2 14V\  
  int x = (rect.Width() - cxIcon + 1) / 2; wQkM:=t5  
  int y = (rect.Height() - cyIcon + 1) / 2; +.G"ool  
  // Draw the icon s{hKl0ds  
  dc.DrawIcon(x, y, m_hIcon); UO/sv2CN  
 } 2-&EkF4p'  
 else .KsR48g8  
 { B /? L$m  
  CDialog::OnPaint(); ?pDr"XH~  
 } PnlI {d  
} d=!:UB  
Cy/&KWLenf  
HCURSOR CCaptureDlg::OnQueryDragIcon() U|(+-R8Z  
{ o4(*nz  
 return (HCURSOR) m_hIcon; N.F5)04  
} JKfG/z|  
F L0uY0K  
void CCaptureDlg::OnCancel() yV30x9i!2  
{ I.2J-pu}  
 if(bTray) |{jT+  
  DeleteIcon(); Jd2.j?P=  
  CDialog::OnCancel(); s27IeF3  
} hsZ/Vnn`  
H}@:Bri  
void CCaptureDlg::OnAbout() gEA SYIQ  
{ \bA Yic  
 CAboutDlg dlg; Z:; }  
 dlg.DoModal(); Ucj?$=  
} D:)Wr, 26  
cs9^&N:w[  
void CCaptureDlg::OnBrowse() JTlk[ c  
{ |@qw  
 CString str; 3r\8v`^>  
 BROWSEINFO bi; d|`Ll  
 char name[MAX_PATH]; v* ;d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lW bu`y  
 bi.hwndOwner=GetSafeHwnd(); Dn- gP  
 bi.pszDisplayName=name; 8~sP{V%  
 bi.lpszTitle="Select folder"; )8Va%{j  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9 _d2u#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <N<Q9}`V  
 if(idl==NULL) x3@-E  
  return; 1GY2aZ@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hbjAxioA  
 str.ReleaseBuffer(); D}-.<  
 m_Path=str; XQ}Zr/f6  
 if(str.GetAt(str.GetLength()-1)!='\\') S{Y zHK  
  m_Path+="\\"; u8e_Lqx?  
 UpdateData(FALSE); jm_-f  
} !e$gp (4  
5J5si<v25  
void CCaptureDlg::SaveBmp() DE?v'7cmA  
{ &W `xZyb3  
 CDC dc; R>Ra~ b  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~%{2Z_t$  
 CBitmap bm; PnsBDf%v  
 int Width=GetSystemMetrics(SM_CXSCREEN); Jh[0xb  
 int Height=GetSystemMetrics(SM_CYSCREEN); Onmmcem  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (IJNBJb  
 CDC tdc; E?m~DYnU  
 tdc.CreateCompatibleDC(&dc); pYO =pL^Q  
 CBitmap*pOld=tdc.SelectObject(&bm); \& JZ >h  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jDzQw>T X  
 tdc.SelectObject(pOld); 1Pf(.&/9_  
 BITMAP btm; S_}`'Z )  
 bm.GetBitmap(&btm); Cj5mM[:s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :<% bAn  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nHK(3Z4G  
 BITMAPINFOHEADER bih; V\~.  
 bih.biBitCount=btm.bmBitsPixel; 5dBftTv?  
 bih.biClrImportant=0; %36x'Dn ?  
 bih.biClrUsed=0; }xZi Ct  
 bih.biCompression=0; &&ioGy}1  
 bih.biHeight=btm.bmHeight; %p Wn9  
 bih.biPlanes=1; 6iC>CY3CG  
 bih.biSize=sizeof(BITMAPINFOHEADER); bbm\y] !t  
 bih.biSizeImage=size; 5*0zI\  
 bih.biWidth=btm.bmWidth; jX53 owZ  
 bih.biXPelsPerMeter=0; &H(yLd[  
 bih.biYPelsPerMeter=0; I[z:;4W}L^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  Et>#&Nw8  
 static int filecount=0; qT O6I5u  
 CString name; Z\0Rw>#  
 name.Format("pict%04d.bmp",filecount++); 3;nOm =I  
 name=m_Path+name; Bous d  
 BITMAPFILEHEADER bfh; i1iP'`r  
 bfh.bfReserved1=bfh.bfReserved2=0; -@To<<`n  
 bfh.bfType=((WORD)('M'<< 8)|'B'); *4,Q9K_  
 bfh.bfSize=54+size; _ _Of0<  
 bfh.bfOffBits=54; =KRM`_QShg  
 CFile bf; TS<d?:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /-=fWtA  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); lFBdiIw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); QV4|f[Ki%  
  bf.WriteHuge(lpData,size); @SQsEq+A?\  
  bf.Close(); z*@eQauA  
  nCount++; b0P3S!E  
 } "gJ?LojB<  
 GlobalFreePtr(lpData); lH-VqkR\  
 if(nCount==1) )m%uSSx#  
  m_Number.Format("%d picture captured.",nCount); %1z;l.c  
 else MqmQ52HR  
  m_Number.Format("%d pictures captured.",nCount); Z~'t'.=z  
  UpdateData(FALSE); t;O)   
}  tm1 =  
r924!zdbR  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9u=A:n\  
{ 4;`z6\u9-  
 if(pMsg -> message == WM_KEYDOWN) ~/OY1~c  
 { w$2q00R>  
  if(pMsg -> wParam == VK_ESCAPE) 'g v0;L  
   return TRUE; \ovs[&  
  if(pMsg -> wParam == VK_RETURN) f}otIf  
   return TRUE; a[{$4JpK  
 } 3i^X9[.  
 return CDialog::PreTranslateMessage(pMsg); F%>$WN#2  
}  C=D*  
1ni+)p>]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XcR=4q|7  
{ ^'UM@dd?!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N['DqS =  
  SaveBmp(); 43=v2P0=Tj  
  return FALSE; !pU$'1D  
} fI.|QD*$b  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Y2|i>5/|<  
 CMenu pop; iOL$|Z(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l{By]S  
 CMenu*pMenu=pop.GetSubMenu(0); ?d')#WnC  
 pMenu->SetDefaultItem(ID_EXITICON); +NlnK6T/  
 CPoint pt; F>;Wbk&[|  
 GetCursorPos(&pt); U)}]Z@I-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )&Ii! tm3  
 if(id==ID_EXITICON) w OL,LU  
  DeleteIcon(); '|}A /`  
 else if(id==ID_EXIT) *A-_*A  
  OnCancel(); U%3N=M  
 return FALSE; 6v%yU3l  
} ^F^g(|(K  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |r9<aVlK  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) LI,wSTVjC  
 AddIcon(); ~Xi@#s~  
 return res; oEIpv;:_  
} Rv1W&s&  
 Y@,iDQ  
void CCaptureDlg::AddIcon() a~}q]o?j  
{ $4bc!  
 NOTIFYICONDATA data; F:j@JMpQ  
 data.cbSize=sizeof(NOTIFYICONDATA); ?sfqg gi  
 CString tip; *WE8J#]d  
 tip.LoadString(IDS_ICONTIP); Q%e<0t7  
 data.hIcon=GetIcon(0); ?m7:@GOE1  
 data.hWnd=GetSafeHwnd(); l 9K`+c+t  
 strcpy(data.szTip,tip); ZL|aB886  
 data.uCallbackMessage=IDM_SHELL; 8SRR)O[)}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n 0!8)Sth  
 data.uID=98; N8A)lYT]_u  
 Shell_NotifyIcon(NIM_ADD,&data); )JMqC+J3*t  
 ShowWindow(SW_HIDE); k4+vI1Cs  
 bTray=TRUE; 0U42QEG2  
} @yp0WB  
$8^Hk xy  
void CCaptureDlg::DeleteIcon() /wD f,Hduz  
{ bY_'B5$.^2  
 NOTIFYICONDATA data; C'R9Nn'  
 data.cbSize=sizeof(NOTIFYICONDATA); N0 {e7M  
 data.hWnd=GetSafeHwnd(); *'@O o  
 data.uID=98; *85N_+Wv!  
 Shell_NotifyIcon(NIM_DELETE,&data); z/t|'8f  
 ShowWindow(SW_SHOW); <2U#U;  
 SetForegroundWindow(); |q`NJ  
 ShowWindow(SW_SHOWNORMAL); VL%. maj  
 bTray=FALSE; =<]`'15"V  
} &V4Zm n?UU  
d$IROZK-D  
void CCaptureDlg::OnChange() H'A N osv  
{ Xhe& "rM  
 RegisterHotkey(); Emlj,c<?j  
} *)m:u:   
5c- P lm%  
BOOL CCaptureDlg::RegisterHotkey() Dka,v  
{ C-M_:kQ[U  
 UpdateData(); yan^\)HZ  
 UCHAR mask=0; \Qml~?$@lH  
 UCHAR key=0; Pps$=`  
 if(m_bControl) "i&)+dr-  
  mask|=4; B{Q}^Mcxy  
 if(m_bAlt) <rC%$tr  
  mask|=2; o.KnDY  
 if(m_bShift) ]4aPn  
  mask|=1; ?(ORk|)kU  
  key=Key_Table[m_Key.GetCurSel()]; Zue3Z{31T  
 if(bRegistered){ OP/DWf  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); JFv70rBe  
  bRegistered=FALSE; $dfc@Fn^x  
 } T//xxH]w-  
 cMask=mask; kn3w6]  
 cKey=key; RELNWr  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <4rnOQ:  
 return bRegistered; p)biOG  
} {-A|f  
$dM_uSt  
  四、小结 i{$-[*WHiV  
Vh-8pF t  
  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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