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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: cJ G><'  
  ?"p:6%GFz  
  一、实现方法 Phsdn`,  
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  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: PMJe6*(x/  
f:k3j}&  
#pragma data_seg("shareddata") iQczvn)"m  
HHOOK hHook =NULL; //钩子句柄 APT'2 -I_  
UINT nHookCount =0; //挂接的程序数目  `x"0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &z-f,`yG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @L%9NqE`O  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rl^_RI  
static int KeyCount =0; \ A\a=A[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 MOJ-q3H^W  
#pragma data_seg() ex8mA6g  
kb?QQ\e  
  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。 }Po&6^  
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  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: +]Oq{v:e  
=5EG}@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR pR8]HNY0  
cKey,UCHAR cMask) t;9f7~  
{ %-+lud  
 BOOL bAdded=FALSE; +MKr.k2  
 for(int index=0;index<MAX_KEY;index++){ }%EQ  
  if(hCallWnd[index]==0){ 8jxgSB",  
   hCallWnd[index]=hWnd; WlVC0&  
   HotKey[index]=cKey; [3s,U4a  
   HotKeyMask[index]=cMask; o}p6qB=;1  
   bAdded=TRUE; x%ZjGDFm  
   KeyCount++; -OZRSjmY  
   break; H~+D2A  
  } #;U_ L`q  
 } vBd^=O  
 return bAdded;  OvU]|4h  
} F]3iL^v  
//删除热键  *5 FSq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }U'fPYYi8  
{ h2+vl@X  
 BOOL bRemoved=FALSE; e9h T  
 for(int index=0;index<MAX_KEY;index++){ wH[@#UP3l  
  if(hCallWnd[index]==hWnd){ MP?9k)f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |_a E~_  
    hCallWnd[index]=NULL; .O'S@ %]  
    HotKey[index]=0; ]j0v.[SX  
    HotKeyMask[index]=0; ?gjM]Ki%:  
    bRemoved=TRUE; Zb`}/%\7  
    KeyCount--; BCF- lrZ&  
    break; E0}`+x  
   } 0 8vA;6zt  
  } ?s(%3_h  
 } ="3Hc=1?R  
 return bRemoved; 2}1(j  
} di`Ql._M  
lu_ y9o^  
QvK/31*QG  
  DLL中的钩子函数如下: o87. (  
g^"",!J/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #B|`F?o  
{ ~!j1</$_  
 BOOL bProcessed=FALSE; w``t"v4  
 if(HC_ACTION==nCode) p+#J;.  
 { K 4I ?1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 a3ve%b  
   switch(wParam) '@RlKMnN  
   {  }m/aigA[1  
    case VK_MENU: ;%odN d  
     MaskBits&=~ALTBIT; 7*d}6\ %  
     break; P~iu|j  
    case VK_CONTROL: ,\4@Ao  
     MaskBits&=~CTRLBIT; c, \TL ]  
     break; ^o,Hu#  
    case VK_SHIFT: ]K?z|&N|HK  
     MaskBits&=~SHIFTBIT; yC4JYF]JN  
     break; .l"_f  
    default: //judge the key and send message 2X;,s`)  
     break; A!H6$-W|p  
   } 37x2fnC  
   for(int index=0;index<MAX_KEY;index++){ AF ZHS\  
    if(hCallWnd[index]==NULL) "T?%4^:g  
     continue; KQaw*T[Q3w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SC74r?N FA  
    { G+ Y`65  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DY^q_+[V  
     bProcessed=TRUE; 52/^>=t  
    } 'g^;_=^G  
   } kM*f9x  
  } ;" '` P[  
  else if((lParam&0xc000ffff)==1){ //有键按下 + B%fp*  
   switch(wParam) pY!@w0.  
   { -OZXl  
    case VK_MENU: &Ph@uZ\  
     MaskBits|=ALTBIT; pq#Hca[  
     break; POfvs]  
    case VK_CONTROL: Y b]eWLv  
     MaskBits|=CTRLBIT; 4&!`Yi_1L  
     break; >1T=Aw2Z.  
    case VK_SHIFT: Q9q:HGXxv  
     MaskBits|=SHIFTBIT; {[61LQ6V9  
     break; i|*(vH&D.  
    default: //judge the key and send message 0diQfu)Fi  
     break; |0ACapp!  
   } VT?J TW  
   for(int index=0;index<MAX_KEY;index++){ xV}E3Yj2#  
    if(hCallWnd[index]==NULL) `]#DdJ_|  
     continue; )/HSt%>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +IK~a9t  
    { \'&:6\-fw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -i:Zi}f  
     bProcessed=TRUE; 4M*UVdJ;  
    } l6:k|hrm;  
   } &7,Kv0j}  
  } ^j[>.D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =&U JFu  
   for(int index=0;index<MAX_KEY;index++){ Z`o}xV  
    if(hCallWnd[index]==NULL) /PE3>"|wE  
     continue; 0V{-5-.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Yl% Ra1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e57}.pF^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "KcSOjvJ  
   } 2BS2$#c>  
  } b&"=W9(V  
 } >7!4o9)c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *P5Xy@:  
} oil s;*q  
usZmf=p-r  
  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: {oy(08 `6  
# 5v 2`|)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :aV(i.LW  
R;.zS^LL  
  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: KRd.Ubs -  
sI, T"D?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) r50}j  
{ YT+fOndjaF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @`G_6 <.`  
 { Wo&MHMP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 '!]ry<  
  SaveBmp(); "[L[*>[9!  
  return FALSE; 9w[7X"#n  
 } pa N )t  
 …… //其它处理及默认处理 3;Kv9i<~LE  
} kLU$8L  
- U!:.  
z\*ii<- @  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 {-2I^Ym 5i  
'b]GcAL  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 !R-M:|  
|Kky+*  
  二、编程步骤 }o0R`15dA  
<%#M&9d)E  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; (s4w0z  
4`)`%R$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *>h"}e41  
U2\g Kg[-Q  
  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; f;!1=/5u-  
;| ##~Y.9  
  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; @Iia>G @Rz  
lZ.x@hDS  
  5、 添加代码,编译运行程序。 \< <u  
v: cO+dQ  
三、程序代码 Uh'3c"  
jw?/@(AC6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;:,hdFap  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k(+ EY%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ K??%Qh5l+C  
#if _MSC_VER > 1000 lCLz!k2di  
#pragma once v!27q*;8H  
#endif // _MSC_VER > 1000 7tP?([o%F  
#ifndef __AFXWIN_H__ 9G_bM(q'^2  
#error include 'stdafx.h' before including this file for PCH 8VQJUwf;  
#endif Gu}|CFL\  
#include "resource.h" // main symbols /.9j$iK#  
class CHookApp : public CWinApp  ;)s$Et%  
{ wkOo8@J\  
 public: E;.<'t>  
  CHookApp(); lM`M70~  
  // Overrides _tTtq/z<  
  // ClassWizard generated virtual function overrides Gl}[1<~o  
  //{{AFX_VIRTUAL(CHookApp) Ox7v*[x'  
 public: "aIiW VQ  
  virtual BOOL InitInstance(); qL.1N~$2  
  virtual int ExitInstance(); JV(qTb W  
  //}}AFX_VIRTUAL De%WT:v  
  //{{AFX_MSG(CHookApp) `[3Iz$K=  
  // NOTE - the ClassWizard will add and remove member functions here. _U(b  
  // DO NOT EDIT what you see in these blocks of generated code ! 3TVp oB`  
  //}}AFX_MSG B38_1X7  
  DECLARE_MESSAGE_MAP() |=L~>G  
}; ^2%_AP0=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); F$QN>wPpM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B{$4s8XU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j&,,~AZm  
BOOL InitHotkey(); A;7p  
BOOL UnInit(); 0O<g) %Vz>  
#endif xpCzx=n3.m  
+EjH9;gx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q]]}8l2  
#include "stdafx.h" <@6K(  
#include "hook.h" 3>Y G  
#include <windowsx.h> S L<P`H|  
#ifdef _DEBUG Vp{! Ft8>  
#define new DEBUG_NEW A:PQIcR;V  
#undef THIS_FILE Fka&\9i  
static char THIS_FILE[] = __FILE__; QH@?.Kb_qU  
#endif G8dC5+h  
#define MAX_KEY 100 JJ`RF   
#define CTRLBIT 0x04 I4 {uw ge  
#define ALTBIT 0x02 Bd jo3eX  
#define SHIFTBIT 0x01 *@/1]W  
#pragma data_seg("shareddata") 1Q"w)Ta  
HHOOK hHook =NULL; &oI;^|  
UINT nHookCount =0; L;N)l2m.\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey mR U-M|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT cK4Q! l6O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 'X_8j` ]#  
static int KeyCount =0; is}6cR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T9w;4XF  
#pragma data_seg() eH,r%r,  
HINSTANCE hins; {JTO Q 8&  
void VerifyWindow(); TbX#K:l  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) e/hA>  
//{{AFX_MSG_MAP(CHookApp) f'&30lF  
// NOTE - the ClassWizard will add and remove mapping macros here. ]S;^QZ  
// DO NOT EDIT what you see in these blocks of generated code! d S]TTU1  
//}}AFX_MSG_MAP ,l/~epx4v)  
END_MESSAGE_MAP() hG51jVYtw  
L c4\i  
CHookApp::CHookApp() ?# ~3%$>  
{ lZ]x #v  
 // TODO: add construction code here, tQ0iie1Ys  
 // Place all significant initialization in InitInstance ?.Mw  
} ERD( qL.J  
f$#--*  
CHookApp theApp; r+%:rFeX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2..b/  
{ /$ Gp<.z  
 BOOL bProcessed=FALSE; zURxXo/\V  
 if(HC_ACTION==nCode) cV^r_E\m  
 { 6[ }~m\cY  
  if((lParam&0xc0000000)==0xc0000000){// Key up r9nH6 Md\  
   switch(wParam) ,dn6z#pb+  
   { tgmG#b*  
    case VK_MENU: RW| LL@r  
     MaskBits&=~ALTBIT; mHCp^g4Q  
     break; (Z(O7X(/  
    case VK_CONTROL: U8TH}9Q  
     MaskBits&=~CTRLBIT; U9^o"vT  
     break; z}?*1c  
    case VK_SHIFT: |dNJx<-  
     MaskBits&=~SHIFTBIT; FvpaU\D  
     break; <ua`WRQr  
    default: //judge the key and send message @CGci lS=  
     break; yQ$Q{,S9  
   } |NuX9!S  
   for(int index=0;index<MAX_KEY;index++){ ueI1O/Mi  
    if(hCallWnd[index]==NULL) me-Tv7WL  
     continue; .Ukejx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) | e{F;8  
    {  l Ozi|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zgre&BV0q  
     bProcessed=TRUE; @o4+MQFn  
    } n-ZOe]3  
   } bu[PQsT  
  } Pnf|9?~$H  
  else if((lParam&0xc000ffff)==1){ //Key down udw>{3>  
   switch(wParam) : L}Fm2^  
   { t~_j+k0K#  
    case VK_MENU: `zf,$67>1  
     MaskBits|=ALTBIT; 2 I:x)  
     break; wxC&KrRF  
    case VK_CONTROL: (4:&tm/;  
     MaskBits|=CTRLBIT; Y]>!uwn  
     break; 4}0DEH.Vx  
    case VK_SHIFT: U|tUX)9O  
     MaskBits|=SHIFTBIT; aqL#g18  
     break; 3JhT  
    default: //judge the key and send message f@JMDJ  
     break; UqVcN$^b  
   } GM]" $  
   for(int index=0;index<MAX_KEY;index++) %Xe#'qNq)  
   { 73/DOF  
    if(hCallWnd[index]==NULL) $H\[yg>4  
     continue; PSCzeR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6(#fGH&[  
    { RP!!6A6:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #fB&Hv #s7  
     bProcessed=TRUE; U(xN}Y ?  
    } RLy2d'DS  
   } 0}LB nV  
  } ~!V5Ug_2  
  if(!bProcessed){ =f48[=  
   for(int index=0;index<MAX_KEY;index++){ 9E`WZo^.  
    if(hCallWnd[index]==NULL) LWH(b s9U  
     continue; Kjw==5)}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Myj 5qh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5(9SIj^O  
   } 8{0=tOXx{  
  } FYwMmb ~3  
 }  Tt;h?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l]g /rs  
} \\ZR~f!<  
Rgstk/1  
BOOL InitHotkey() TRLz>mQ  
{ mGZJ$|  
 if(hHook!=NULL){ e6G=Bq$  
  nHookCount++; 1gK<dg  
  return TRUE; c> SFt tbU  
 } 5Z8Zb.  
 else +qPpPjG;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,\){-H/n  
  if(hHook!=NULL) J#1-Le8@  
   nHookCount++; U-~6<\Mf  
  return (hHook!=NULL); $ ,:3I*}be  
}  w^Mj[v#  
BOOL UnInit() 2SjH7 '  
{ p :v'"A}  
 if(nHookCount>1){ 4n9".UHh  
  nHookCount--; !O*'mX  
  return TRUE; `EBI$;!  
 } %-nYK3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); X  jPPgI  
 if(unhooked==TRUE){ J\@ r ~x5G  
  nHookCount=0; ,0hk)Vvr3  
  hHook=NULL; _DDknQP  
 } c[IT?6J4  
 return unhooked; `s )- lI  
} |2L|Zp&  
o"kVA;5<G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `j#zwgUs  
{ g36:OK"  
 BOOL bAdded=FALSE; cVV@MC  
 for(int index=0;index<MAX_KEY;index++){ wo#,c(  
  if(hCallWnd[index]==0){ v[7iWBqJ  
   hCallWnd[index]=hWnd; s'7PHP)LOJ  
   HotKey[index]=cKey; lRk)  
   HotKeyMask[index]=cMask; g)3HVAT  
   bAdded=TRUE; Vx Vpl@  
   KeyCount++; (^{tu89ab  
   break; '3i,^g0?t0  
  } ]2_b_ok  
 } _ww>u""B~  
 return bAdded; $yn7XonS  
} (yJY/|  
U}yq*$N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e7_.Xr~[  
{ u# TNW.  
 BOOL bRemoved=FALSE; 21T#NYfew  
 for(int index=0;index<MAX_KEY;index++){ *+ i1m `6Q  
  if(hCallWnd[index]==hWnd){ Y:?cWO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }O + a  
    hCallWnd[index]=NULL; Tqf:G4!  
    HotKey[index]=0; +GYO<N7  
    HotKeyMask[index]=0; ,J$XVvwxF  
    bRemoved=TRUE; **G5fS.^W  
    KeyCount--; k#g` n3L  
    break; f,}(= u  
   } /!i`K{  
  } w=QlQ\  
 } m{w'&\T  
 return bRemoved; BNw};.lO  
} XsEo tW  
3LkcK1x.  
void VerifyWindow() De-hHY{>  
{ gX%"Ki7.  
 for(int i=0;i<MAX_KEY;i++){ 6(1S_b=a  
  if(hCallWnd!=NULL){ ?Tlt(%f  
   if(!IsWindow(hCallWnd)){ d}w}VL8l  
    hCallWnd=NULL; 3a\De(;  
    HotKey=0; Oxp!G7qfo  
    HotKeyMask=0; "- ?uB Mz  
    KeyCount--; n1Wo<$#  
   } v[2N-  
  } +^cjdH*  
 } j[RY  
} z 0}JiWR  
^$AJV%3wI  
BOOL CHookApp::InitInstance() %TeH#%[g>\  
{ %MM)5MsB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `9Rj;^NJ  
 hins=AfxGetInstanceHandle(); 9 _b_O T  
 InitHotkey(); BO,xA-+  
 return CWinApp::InitInstance(); Be~ '@  
} aN;c.1TY  
-`A+Qp)  
int CHookApp::ExitInstance() W]oILL"d  
{  8+,I(+  
 VerifyWindow(); 47=YP0r?>T  
 UnInit(); Qx_]oz]NY  
 return CWinApp::ExitInstance(); }Pm; xHnf&  
} 8Q(A1U  
:\]qB&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 98rO]rg  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) i*)BFV_-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tc|PN+v;  
#if _MSC_VER > 1000 C klIrD{  
#pragma once `uof\D<']  
#endif // _MSC_VER > 1000 ^4~?]5Y\  
]^0mh["  
class CCaptureDlg : public CDialog ANRZQpnXQ  
{ s}<i[hY>  
 // Construction | vPU]R>6  
 public: WjsmLb:5  
  BOOL bTray; 6ltV}Wt-  
  BOOL bRegistered; Ms=N+e$n  
  BOOL RegisterHotkey(); $YiG0GK<"  
  UCHAR cKey; )agrx76]3w  
  UCHAR cMask; v:gdG|n"  
  void DeleteIcon(); M%#F"^8v  
  void AddIcon(); +[` )t/   
  UINT nCount; m^o?{ (K  
  void SaveBmp(); 9yK\<6}}QH  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7P:/ (P  
  // Dialog Data NpH:5hi  
  //{{AFX_DATA(CCaptureDlg) hiEosI C  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5p>rQq0  
  CComboBox m_Key; ;--p/h*.  
  BOOL m_bControl; Hbl&)!I  
  BOOL m_bAlt; 0O?\0k;o  
  BOOL m_bShift; #('GGzL6c  
  CString m_Path; tI<6TE'!p#  
  CString m_Number; N *,[(q  
  //}}AFX_DATA m>^vr7  
  // ClassWizard generated virtual function overrides %F87"v~  
  //{{AFX_VIRTUAL(CCaptureDlg) xQ! Va  
 public: IqFmJs|C  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i 2 ='>  
 protected: p+;;01Z+_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5Y>fVq{U?;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b(~#CHg  
  //}}AFX_VIRTUAL -HvJ&O.V$  
  // Implementation Zm vtUma  
 protected: DFQ`<r&!  
  HICON m_hIcon; &-L9ws  
  // Generated message map functions ao"Z%#Jb~  
  //{{AFX_MSG(CCaptureDlg) pQoZDD@B$  
  virtual BOOL OnInitDialog(); RREl($$p  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zbJ}@V  
  afx_msg void OnPaint(); ]Na;b  
  afx_msg HCURSOR OnQueryDragIcon(); Ch)E:Dvq6  
  virtual void OnCancel(); : cPV08i  
  afx_msg void OnAbout(); fS3%  
  afx_msg void OnBrowse(); XCT3:db  
  afx_msg void OnChange(); %3yrX>Js  
 //}}AFX_MSG m A('MS2  
 DECLARE_MESSAGE_MAP() n T7]PhJ  
}; F$S/zh$)0  
#endif y]g5S-G  
[W99}bi$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g,B@*2Uj  
#include "stdafx.h" } x Kv N  
#include "Capture.h" SC--jhDZ  
#include "CaptureDlg.h" >#y1(\e  
#include <windowsx.h> ;?Q0mXr  
#pragma comment(lib,"hook.lib") v 8TNBsEL  
#ifdef _DEBUG v}=pxWhm  
#define new DEBUG_NEW S[CWrPaDQ  
#undef THIS_FILE g&\;62lV%  
static char THIS_FILE[] = __FILE__; AMN`bgxW  
#endif _ucixM#  
#define IDM_SHELL WM_USER+1 ^97[(89G9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ky*xAx:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [$M l;K  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dKmPKeJM  
class CAboutDlg : public CDialog Lr Kx  
{ RN$q,f[#  
 public: MEOfVh  
  CAboutDlg(); E O"  
  // Dialog Data M"foP@  
  //{{AFX_DATA(CAboutDlg) Mo]iVj8~  
  enum { IDD = IDD_ABOUTBOX }; }Qh%Z)  
  //}}AFX_DATA knzQ)iv&&  
  // ClassWizard generated virtual function overrides yMOYTN@]  
  //{{AFX_VIRTUAL(CAboutDlg) D >kkA|>  
 protected: UMH~Q`"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tPDB'S:&3  
  //}}AFX_VIRTUAL )>]SJQ!k  
  // Implementation @h5Q?I  
 protected: m|[cEZxHB  
  //{{AFX_MSG(CAboutDlg) }mS Q!"f:  
  //}}AFX_MSG _k5$.f:Yj<  
  DECLARE_MESSAGE_MAP() f5R%F ~  
}; bBQHxH}vi  
9lX[rBZ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9Dyw4'W.N  
{ NM1TFs2Y*  
 //{{AFX_DATA_INIT(CAboutDlg) :~p_(rE  
 //}}AFX_DATA_INIT 6wb M$|yFj  
} nTsPX Tat  
3]>YBbXvE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) nZ`=Up p)  
{ z.W1Za  
 CDialog::DoDataExchange(pDX); 7KtgR=-Lb  
 //{{AFX_DATA_MAP(CAboutDlg) 4-\4G"4  
 //}}AFX_DATA_MAP /sVmQqVY  
} K,*IfHi6[  
QzYaxNGv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) JV! }"[  
 //{{AFX_MSG_MAP(CAboutDlg) U}{\qs-zt  
 // No message handlers !zxq9IhWR  
 //}}AFX_MSG_MAP R~bLEo  
END_MESSAGE_MAP() tOPk x(  
d%Ku 'Jy  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :$QwOz^N*  
: CDialog(CCaptureDlg::IDD, pParent) CF5%&B  
{ N]|U-fN\  
 //{{AFX_DATA_INIT(CCaptureDlg) $-)y59w"  
  m_bControl = FALSE; 7RgnL<t~:8  
  m_bAlt = FALSE; P2)g%$ME  
  m_bShift = FALSE; vw` '9~  
  m_Path = _T("c:\\"); 3iiOxg?j  
  m_Number = _T("0 picture captured."); ,aa %{  
  nCount=0; i{PX=  
  bRegistered=FALSE; ]o_E]5"jO  
  bTray=FALSE; p-/}@r3Z+  
 //}}AFX_DATA_INIT 2aQ}| `  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U7G|4(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Vb2")+*:  
} *c@]c~hY,  
&J=x[{R  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S*rcXG6Q^  
{ t*Wxvoxk  
 CDialog::DoDataExchange(pDX); gOk^("@  
 //{{AFX_DATA_MAP(CCaptureDlg) n6*; ~h5  
  DDX_Control(pDX, IDC_KEY, m_Key); q5w)i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /h@rLJ)o>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); @HXXhYH  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %$!EjyH9  
  DDX_Text(pDX, IDC_PATH, m_Path); <JJi  
  DDX_Text(pDX, IDC_NUMBER, m_Number); P+3)YO1C  
 //}}AFX_DATA_MAP sQT,@'"  
} Jaf=qwZ/`  
dGc>EZSdj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5xG/>f n  
//{{AFX_MSG_MAP(CCaptureDlg) K9Pw10g'  
 ON_WM_SYSCOMMAND() t{/ EN)J  
 ON_WM_PAINT() 14\!FCe)!  
 ON_WM_QUERYDRAGICON() o-t!z'\lO  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) yDw^xGws  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) D%.<} vG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5{6ebq55"  
//}}AFX_MSG_MAP nzu 3BVv  
END_MESSAGE_MAP() H %PIE1_  
;:gx;'dm5  
BOOL CCaptureDlg::OnInitDialog() Eb9M;u  
{ U 0S}O(Ptr  
 CDialog::OnInitDialog(); z9KsSlS ^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dkbKnY&  
 ASSERT(IDM_ABOUTBOX < 0xF000); F[OBPPQ3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [h2V9>4:  
 if (pSysMenu != NULL) @KYmkx W  
 { -OP5v8c f  
  CString strAboutMenu; 2!Ex55  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zphStiwIQ  
  if (!strAboutMenu.IsEmpty()) ~9ILN~91  
  { v6?<)M%  
   pSysMenu->AppendMenu(MF_SEPARATOR); @)8C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h-h}NCP  
  } Jh:-<xy)  
 } 3'2}F%!Mv  
 SetIcon(m_hIcon, TRUE); // Set big icon oAp I/o  
 SetIcon(m_hIcon, FALSE); // Set small icon l@YpgyqaL  
 m_Key.SetCurSel(0); #$%gs]  
 RegisterHotkey(); 9/|i. 2&  
 CMenu* pMenu=GetSystemMenu(FALSE); #Ryu`b  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k07) g:_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VVje|T^{Z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }fs;yPl,  
 return TRUE; // return TRUE unless you set the focus to a control ]R{=|  
}  Q-&]Vg  
M>k7 '@G  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) w02HSQ  
{ (;h]'I@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5cQBqH]  
 { 9tC8|~Q  
  CAboutDlg dlgAbout; UwQ3q  
  dlgAbout.DoModal(); Vt4}!b(O  
 } 3B "rI  
 else Q<``}:y|>  
 { fhn0^Qc"+  
  CDialog::OnSysCommand(nID, lParam); Tm^zo Vi  
 } AjANuyUaP  
} Fk(0q/b  
z_l3=7R  
void CCaptureDlg::OnPaint() [l5 "'{x  
{ ?\F,}e  
 if (IsIconic()) {nOK*7+ "  
 { T[q-$8U  
  CPaintDC dc(this); // device context for painting r5iO%JFg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @#H{nj Z  
  // Center icon in client rectangle 0I?3@Nz6  
  int cxIcon = GetSystemMetrics(SM_CXICON); a\m10Ih:  
  int cyIcon = GetSystemMetrics(SM_CYICON);  2 5ZGuM  
  CRect rect; Da-(D<[0  
  GetClientRect(&rect); Ef`LBAfOO  
  int x = (rect.Width() - cxIcon + 1) / 2; $'FPst8Q<  
  int y = (rect.Height() - cyIcon + 1) / 2; :g9z^ $g  
  // Draw the icon ]:E]5&VwV}  
  dc.DrawIcon(x, y, m_hIcon); '\*Rw]bR|  
 } r rwsj`  
 else Nyqm0C6m^  
 { 4+ k:j=x  
  CDialog::OnPaint(); '7*=m^pc  
 } UXk8nH  
} }5tn  
AYZds >#Q  
HCURSOR CCaptureDlg::OnQueryDragIcon() -6tF   
{ x(7K3(#|  
 return (HCURSOR) m_hIcon; NxX1_d  
} N[+dX_h  
=;/h{ t  
void CCaptureDlg::OnCancel() usTCn3u  
{ V!<#E)-?<  
 if(bTray) l*:p==  
  DeleteIcon(); -% f DfjP  
  CDialog::OnCancel(); cT0g, ^&  
} }t-r:R$,  
N~ozyIP,  
void CCaptureDlg::OnAbout() _gGy(`  
{ ? sewU9*  
 CAboutDlg dlg; L2h+[f  
 dlg.DoModal(); \4p<;$'  
} G\NCEE'A  
anwn!Eqk"  
void CCaptureDlg::OnBrowse() 7z,M`14  
{ hB+ t pa  
 CString str; |}|;OG  
 BROWSEINFO bi; 9,c>H6R7  
 char name[MAX_PATH]; HYH!;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6e*b;{d  
 bi.hwndOwner=GetSafeHwnd(); n|*V 8VaL  
 bi.pszDisplayName=name; DJW1kR  
 bi.lpszTitle="Select folder"; I.<#t(io  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;hZ@C!S:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5nn*)vK {  
 if(idl==NULL) Bm7GU`j"  
  return; -?'CUm*Od  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "}EbA3  
 str.ReleaseBuffer(); WE7l[<b  
 m_Path=str; |#B"j1D,H  
 if(str.GetAt(str.GetLength()-1)!='\\') 3*TS 4xX  
  m_Path+="\\"; By_Ui6:D  
 UpdateData(FALSE); nJya1AH;  
} )AoFd>  
MnI $%  
void CCaptureDlg::SaveBmp() s?E:]  
{ F1=+<]!  
 CDC dc; e`rY]X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); WI,=?~-   
 CBitmap bm; B<RONQj_  
 int Width=GetSystemMetrics(SM_CXSCREEN); xVyUUzXs  
 int Height=GetSystemMetrics(SM_CYSCREEN); zef,*dQY   
 bm.CreateCompatibleBitmap(&dc,Width,Height); |Q;o538  
 CDC tdc; ,H?p9L; qp  
 tdc.CreateCompatibleDC(&dc); l}2WW1b(  
 CBitmap*pOld=tdc.SelectObject(&bm); gsp 7N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gNd J=r4  
 tdc.SelectObject(pOld); S8RB0^Q7  
 BITMAP btm; ]EnaZWyO]  
 bm.GetBitmap(&btm); TH!8G,(w  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NLl~/smMS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); d/>,U7eS[+  
 BITMAPINFOHEADER bih; 3>" h*U#  
 bih.biBitCount=btm.bmBitsPixel; srLr~^$j[  
 bih.biClrImportant=0; 2>k)=hl:  
 bih.biClrUsed=0; [BBKj)IK  
 bih.biCompression=0; 7]j-zv  
 bih.biHeight=btm.bmHeight; 7nz+n#  
 bih.biPlanes=1; 0gD0}nH  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8!GLw-kb  
 bih.biSizeImage=size; H| U/tU-  
 bih.biWidth=btm.bmWidth; ..!-)q'?  
 bih.biXPelsPerMeter=0; X^5"7phI@  
 bih.biYPelsPerMeter=0; ?myXG92  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N08n/u&cr,  
 static int filecount=0; P{!:pxu[  
 CString name; *h:EE6|  
 name.Format("pict%04d.bmp",filecount++); q'U5QyuC  
 name=m_Path+name; mN 6`8 [  
 BITMAPFILEHEADER bfh; }%ThnFFBw  
 bfh.bfReserved1=bfh.bfReserved2=0; ON0+:`3\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); S "Pj 1  
 bfh.bfSize=54+size; +~ Ay h[V  
 bfh.bfOffBits=54; !u}3H|6~  
 CFile bf; J*!:ar  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;-GzGDc~0  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pHB35=p28  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y9li<u<PF  
  bf.WriteHuge(lpData,size); bV*zMoD#  
  bf.Close(); ('q vYQ  
  nCount++; /2Lo{v=0[  
 } 6QXQ<ah"  
 GlobalFreePtr(lpData); 6.s?  
 if(nCount==1) wrYQ=u#Z  
  m_Number.Format("%d picture captured.",nCount); rDX'oP:  
 else {IHK<aW  
  m_Number.Format("%d pictures captured.",nCount); 5MY}(w  
  UpdateData(FALSE); ;nKHm  
} B8AzN9v&"N  
SM+fG:4d  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kdh9ftm*\  
{ @1?]$?u&  
 if(pMsg -> message == WM_KEYDOWN) [Cqqjv;_  
 { uQ]]]Z(H'  
  if(pMsg -> wParam == VK_ESCAPE) 36x:(-GFq  
   return TRUE; !5%5]9'n@*  
  if(pMsg -> wParam == VK_RETURN) asN }  
   return TRUE; $>ZP%~O  
 } s.^9HuM  
 return CDialog::PreTranslateMessage(pMsg); #2R%H.*t  
} w<e;rKr   
=l4\4td9p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NS4'IR=;E!  
{ r`R~{;oT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2HGD{;6>v{  
  SaveBmp(); +^DRto=  
  return FALSE; eSX[J6  
} !x$ :8R  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JkDPuTXD  
 CMenu pop; #;LMtDaL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xGEmrE<;  
 CMenu*pMenu=pop.GetSubMenu(0); ^ ]qV8  
 pMenu->SetDefaultItem(ID_EXITICON); OZ'.}((?n  
 CPoint pt; M2E87w  
 GetCursorPos(&pt); vk)0n=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0 \Yx.\X,  
 if(id==ID_EXITICON) =ym  
  DeleteIcon(); 4^[}]'w  
 else if(id==ID_EXIT) aaz"`,7_  
  OnCancel(); +'['HQ)  
 return FALSE; \q|7,S,5  
} (#B^Hyz!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6{+_T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }u-S j/K  
 AddIcon(); l IVxW+  
 return res; P"9@8aLB  
} vDW&pF_eI>  
4l ZJb  
void CCaptureDlg::AddIcon() HKiVEg  
{ H*{k4  
 NOTIFYICONDATA data; r=DHt&x=  
 data.cbSize=sizeof(NOTIFYICONDATA); PM-PP8h  
 CString tip; }kCn@  
 tip.LoadString(IDS_ICONTIP); P,/13tZ#3  
 data.hIcon=GetIcon(0); } }f_  
 data.hWnd=GetSafeHwnd(); m c\ C  
 strcpy(data.szTip,tip); M*O(+EM  
 data.uCallbackMessage=IDM_SHELL; IQw %|^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 974eY  
 data.uID=98; PPCTc|G  
 Shell_NotifyIcon(NIM_ADD,&data); GL 5^_`n  
 ShowWindow(SW_HIDE); i9;27tT~<  
 bTray=TRUE; }*.:Hv"  
} j!S1Y0CV  
w`j*W$82  
void CCaptureDlg::DeleteIcon() [T4 pgt'H  
{ lj EB  
 NOTIFYICONDATA data; Bzu(XQ  
 data.cbSize=sizeof(NOTIFYICONDATA); /1 US,  
 data.hWnd=GetSafeHwnd(); pymx\Hd,  
 data.uID=98; $!F&>=o  
 Shell_NotifyIcon(NIM_DELETE,&data); 7}d$*C  
 ShowWindow(SW_SHOW); K=tx5{V  
 SetForegroundWindow(); 8Da(tS  
 ShowWindow(SW_SHOWNORMAL); 18.Y/nZAgQ  
 bTray=FALSE; f^!11/Wv  
} Yz2{LW[K  
BZJKiiD  
void CCaptureDlg::OnChange() |I}A> XG  
{ Kd/[ Bs%  
 RegisterHotkey(); Ehb?CnV#J  
} T/wM(pr'   
TwM1M["3  
BOOL CCaptureDlg::RegisterHotkey() ,b6kTQq  
{ tg7C;rJ  
 UpdateData(); {5QosC+o6Q  
 UCHAR mask=0; H}h~~7E  
 UCHAR key=0; 0 OAqA?Z  
 if(m_bControl) M)"]$TM  
  mask|=4; ZI58XS+  
 if(m_bAlt) DYo<5^0  
  mask|=2; wi\z>'R  
 if(m_bShift) Y_[g_  
  mask|=1; 5ys #L&q'Z  
  key=Key_Table[m_Key.GetCurSel()]; oUQGLl!V  
 if(bRegistered){ ;'=VrE6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); X2 \E9hJg  
  bRegistered=FALSE; X)Dqeb6  
 } UsLh)#}h  
 cMask=mask; 9m\)\/V  
 cKey=key; S9G8aea/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BgJkrv7~  
 return bRegistered; %"l81z  
} M'cJ)-G  
oMh~5 W  
  四、小结 0\5M^:8i3  
g|ql 5jW  
  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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