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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: ~fBtQGdX  
  IW)()*8;/  
  一、实现方法 ~ {?_p@&n  
/Y*WBTV'  
  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: 7@#>b E6  
4]rnY~  
#pragma data_seg("shareddata") pny11C  
HHOOK hHook =NULL; //钩子句柄 ylUrLQ\  
UINT nHookCount =0; //挂接的程序数目 #ml S}~n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Hh%I0#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Okgv!Nt8)A  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w _u\pa  
static int KeyCount =0; rJd,Rdt.  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NnO~dRx{  
#pragma data_seg() zqd@EF6/bz  
LU+3{O5y  
  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。 t^VwR=i  
OBgkpx*Q  
  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: 6T>mW#E&  
he#J|p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H1 2Fw'2  
cKey,UCHAR cMask) h-g+g#*  
{ 2^XGGB0  
 BOOL bAdded=FALSE; 7;u e  
 for(int index=0;index<MAX_KEY;index++){ fTzvmC:g7  
  if(hCallWnd[index]==0){ h,QKd>4:CF  
   hCallWnd[index]=hWnd; 9*$t!r{B@  
   HotKey[index]=cKey; .\ K_@M  
   HotKeyMask[index]=cMask; tWo{7)Eb  
   bAdded=TRUE; ^m L@e'r  
   KeyCount++; 3sc+3-TF  
   break; *RT>`,t/  
  } T} `x-  
 } y@]_+2Vo  
 return bAdded; Ulhk$CPA  
} }L &^xe  
//删除热键 X#d~zk[r2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \:R%4w#Jv  
{ $v,dz_O*\  
 BOOL bRemoved=FALSE; ai}mOyJs  
 for(int index=0;index<MAX_KEY;index++){ 8][nmjk0  
  if(hCallWnd[index]==hWnd){ X$%'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QU#w%|  
    hCallWnd[index]=NULL; d^/3('H6  
    HotKey[index]=0; -HQQw$  
    HotKeyMask[index]=0; Yi .u"sh]  
    bRemoved=TRUE; TP VVck-T8  
    KeyCount--; BMhy=+\  
    break; [vge56h  
   } 832v"k CD  
  } ,/[6e\0~  
 } |b[+I?X  
 return bRemoved; L9-h;] x!  
} ~7Y+2FZ  
V=)_yIS  
jN e`;o  
  DLL中的钩子函数如下: 8m5p_\&  
P D4Tz!F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $ oTdfb  
{ & SiP\65N  
 BOOL bProcessed=FALSE; MRQ.`IoS  
 if(HC_ACTION==nCode) _AYXc] 4%  
 { OtSL*'7>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 c/Qt Ot  
   switch(wParam) J~=n`pW  
   {  >oea{u  
    case VK_MENU: )S`jFQ1  
     MaskBits&=~ALTBIT; ktI/3Mb@  
     break; n 9\ C2r  
    case VK_CONTROL: )i q-yjO6  
     MaskBits&=~CTRLBIT; j0Bu-sO$w  
     break; W8Q|$ZJ88F  
    case VK_SHIFT: iM2W]  
     MaskBits&=~SHIFTBIT; dG@"!!,  
     break; `{,Dy!rL  
    default: //judge the key and send message @|LBn6q  
     break; =,%CLS,6w  
   } $4-$pL6"  
   for(int index=0;index<MAX_KEY;index++){ I[b}4M6E  
    if(hCallWnd[index]==NULL) ?/TSi0R  
     continue; rJFc({ 0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qNI, 62  
    { YiYV>gaf"H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vK(i 9>;7  
     bProcessed=TRUE; lW<PoT  
    } |4 v0:ETb$  
   } -D xL0:E  
  } -<Hu!V`+  
  else if((lParam&0xc000ffff)==1){ //有键按下 C(S'#cm  
   switch(wParam) ]"+95*B  
   { Q#^Qv.s?K  
    case VK_MENU: )=\# UE+W  
     MaskBits|=ALTBIT; J~%K_~Li  
     break; XIvn_&d;G  
    case VK_CONTROL: jxiC Kx,G  
     MaskBits|=CTRLBIT; ;?W|#*=R  
     break; H1I{/g  
    case VK_SHIFT: (&&4J{`W9  
     MaskBits|=SHIFTBIT; y[>;]R7'  
     break; )v]/B+  
    default: //judge the key and send message ng:kA%! Q  
     break; n$U#:aQE  
   } "~=mG--I  
   for(int index=0;index<MAX_KEY;index++){ ;WgJ<&33  
    if(hCallWnd[index]==NULL) 0~HKiH-  
     continue; GQ*wc?f3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u4.ngjJ  
    { ,B08i o-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SaC d0. h  
     bProcessed=TRUE; 7uT:b!^f[  
    } 76>7=#m0u'  
   } [v$0[IuY,  
  } #BJG9DFP4`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 cHcmgW\4  
   for(int index=0;index<MAX_KEY;index++){ T_X6Ulp  
    if(hCallWnd[index]==NULL) mK[)mC _8  
     continue; e2z h&j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'D6T8B4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gq_-Val]"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ` L >  
   } 76V 6cI=+  
  } xBUya4w  
 } HODz*pI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /R~1Zj2&  
} *4U^0e  
?6(I V]  
  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: UJ0<%^f  
Dw=gs{8D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WZazJ=27}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3= DNb+D!  
$"dR SysB  
  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: uA,>a>xYI  
+zrAG 24q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AgOp.~*Z~V  
{ 5~Cakd ]>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I#m-g-J  
 { SF}<{x_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 U7doU'V/  
  SaveBmp(); i:rFQ8 I  
  return FALSE; 90|7ArM_[  
 } 6lk l7zm  
 …… //其它处理及默认处理 .fN"@l  
} 8~90 30>Q  
`(v='$6}  
|u0( t,T  
  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。 AtU v71D:  
TT50(_8  
  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。 *.~6S3}  
X/z6"*(|/  
  二、编程步骤 s7g(3<(  
/CuXa%Ci^  
  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"; 1BAgtd$3  
1rKlZsZ#*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; D'L'#/hK  
4J;-Dq  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; zG' "9kJx  
r|PFw6  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /&CmO>^e  
d)@<W1;  
  5、 添加代码,编译运行程序。 1x @qkL6  
gzjR 6uz  
三、程序代码 rgSOS-ox  
uC8L\UXk  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL CbPuoOl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) K =C!b?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ oY1';&BO9  
#if _MSC_VER > 1000 rj6tZJZ#o0  
#pragma once '"<6.,Ae  
#endif // _MSC_VER > 1000 =Zu^80/  
#ifndef __AFXWIN_H__ /n5F(5<  
#error include 'stdafx.h' before including this file for PCH %q!8={J8  
#endif Ypeiy `.  
#include "resource.h" // main symbols U~} U\_  
class CHookApp : public CWinApp HDda@Jy  
{ uch>AuF:  
 public: p8kr/uMP ;  
  CHookApp(); R)M_|ca  
  // Overrides ?lbH02P{v  
  // ClassWizard generated virtual function overrides ;<$H)`*  
  //{{AFX_VIRTUAL(CHookApp) !/^-;o7  
 public: Sr&515  
  virtual BOOL InitInstance(); -6tgsfEr  
  virtual int ExitInstance(); 4Ue_Y 'LmM  
  //}}AFX_VIRTUAL a 4=N9X  
  //{{AFX_MSG(CHookApp) <+^6}8-  
  // NOTE - the ClassWizard will add and remove member functions here. 1iX)d)(b  
  // DO NOT EDIT what you see in these blocks of generated code ! Nru7(ag1~  
  //}}AFX_MSG qw7@(R'"  
  DECLARE_MESSAGE_MAP() DUL4noq{  
}; jn%!AH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ot`%*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aM@z^<Ub  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FuUD 61JHY  
BOOL InitHotkey(); S#-wl2z  
BOOL UnInit(); %'xb%`t  
#endif Y 2Q=rj  
*?z0$Kz<,[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _(d.!qGz  
#include "stdafx.h" cooUE<a  
#include "hook.h"  6\u!E~zy  
#include <windowsx.h> h)6GaJ=  
#ifdef _DEBUG *\wp?s>-t  
#define new DEBUG_NEW d{3@h+zL  
#undef THIS_FILE oT{@_U{*J  
static char THIS_FILE[] = __FILE__; QJ F=UB  
#endif 1=|7mehL%  
#define MAX_KEY 100 {^ m(,K_  
#define CTRLBIT 0x04 ?_oF:*~\  
#define ALTBIT 0x02 [F_/2+e  
#define SHIFTBIT 0x01 [97KBoSU  
#pragma data_seg("shareddata") c9\2YKo  
HHOOK hHook =NULL; anj#@U;!  
UINT nHookCount =0; +vNZW@_$D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ari7iF ~j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^A][)*SZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey YXU|h  
static int KeyCount =0; $B#6tk~u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift B d^"=+c4  
#pragma data_seg() Fhv2V,nZ<  
HINSTANCE hins; T1` |~Z?g-  
void VerifyWindow(); C@Nv;;AlU  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +&X%<S W  
//{{AFX_MSG_MAP(CHookApp) -w;(cE  
// NOTE - the ClassWizard will add and remove mapping macros here. v}sY|p"  
// DO NOT EDIT what you see in these blocks of generated code!  Og2vGzD  
//}}AFX_MSG_MAP p1D[YeF4  
END_MESSAGE_MAP() K. %U  
t ?h kL  
CHookApp::CHookApp() FVB;\'/  
{ \eGKkSy  
 // TODO: add construction code here, @)>D))+  
 // Place all significant initialization in InitInstance uK ("<u|  
} mv atUe  
x lsqj`=  
CHookApp theApp; 4g}FB+[u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZkP {[^6d\  
{ >#}2J[2HQ  
 BOOL bProcessed=FALSE; .}k(L4T|=  
 if(HC_ACTION==nCode) M wab!Ya  
 { R//$r%a  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2oZ9laJO  
   switch(wParam) X 6 lH|R  
   { ;' nL:\  
    case VK_MENU: >sD4R}\})  
     MaskBits&=~ALTBIT; w-b' LP  
     break; Vvt  ;  
    case VK_CONTROL: Kzb`$CGK  
     MaskBits&=~CTRLBIT; R0;ef D  
     break; x1gx$P  
    case VK_SHIFT: 6*nAo8gl  
     MaskBits&=~SHIFTBIT; HPQ/~0$  
     break; %d m-?`  
    default: //judge the key and send message 1|ZhPsD.}g  
     break; ++}\v9Er  
   } GIftrYr  
   for(int index=0;index<MAX_KEY;index++){ *U=]@I}J  
    if(hCallWnd[index]==NULL) {ub/3Uh  
     continue; :%JC^dV(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T#!lPH :&h  
    { T;\^#1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); C}?0`!Cc%  
     bProcessed=TRUE; lFUWV)J\  
    } h(B,d,q"  
   } TFR( 4W  
  } 9Bdt(}0A  
  else if((lParam&0xc000ffff)==1){ //Key down E2AW7f(/  
   switch(wParam) Nt:8ogk/  
   { ukuo:P<a  
    case VK_MENU: Jqr)V2Y  
     MaskBits|=ALTBIT; _M,lQ~  
     break; ciMM^ZRIb  
    case VK_CONTROL: D H^T x  
     MaskBits|=CTRLBIT; J$9:jE-4  
     break; u/Fj'*M  
    case VK_SHIFT: V &Mf:@y  
     MaskBits|=SHIFTBIT; PfG`C5 d  
     break; Nf9fb?  
    default: //judge the key and send message y69J%/c ra  
     break; P2 0|RvE  
   } k_GP> b\"k  
   for(int index=0;index<MAX_KEY;index++) YCy22@C  
   { PoShQR<  
    if(hCallWnd[index]==NULL) t~M $%)h  
     continue; c 5`US  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 68R1AqU_  
    { ~V)?>)T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~S; Z\  
     bProcessed=TRUE; % *z-PT22  
    } mzD^ Y<LTd  
   } uXQ >WI@eF  
  } "DSPPE&[c  
  if(!bProcessed){ 5V-jMB  
   for(int index=0;index<MAX_KEY;index++){ $R^AEa7  
    if(hCallWnd[index]==NULL) Q;h3v1GC\P  
     continue; |@j _2Q,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +&ZX$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .~=HgOJ  
   } ,smF^l   
  } Psa@@'w  
 } znZ7*S >6\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~# 7wdP  
} uCzii o`S  
Y:x/!-  
BOOL InitHotkey() V*65b(q)  
{ AxCI 0  
 if(hHook!=NULL){ 0y %L-:/c|  
  nHookCount++; *]s&8/Gmb  
  return TRUE; ';RI7)<  
 } x:5dC I  
 else  ?RD *1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); . p^xS6e{  
  if(hHook!=NULL) A8?[6^%O|  
   nHookCount++; ^uaFg`S  
  return (hHook!=NULL); 0,FC YTtj$  
} Ie'P#e'  
BOOL UnInit() X;fy\HaU  
{ 45}v^|Je\  
 if(nHookCount>1){  s&*yk p  
  nHookCount--; ilEi")b=  
  return TRUE; b;9n'UX\  
 } :kw0y  
 BOOL unhooked = UnhookWindowsHookEx(hHook); O|v (5 8A  
 if(unhooked==TRUE){ J(h3]J/Yw  
  nHookCount=0; Q e1oT)  
  hHook=NULL; FMu!z  
 } ;Gm>O7"|@  
 return unhooked; r(uP!n1+  
} `?o=*OS7Y  
:%_q[}e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6 ,N6jaW  
{ Li`hdrO'ii  
 BOOL bAdded=FALSE; ]TK=>;&  
 for(int index=0;index<MAX_KEY;index++){ 3n(*E_n  
  if(hCallWnd[index]==0){ t]m!ee8*X<  
   hCallWnd[index]=hWnd; 02 f9 wV  
   HotKey[index]=cKey; TGWdyIk  
   HotKeyMask[index]=cMask; (:$9%,x  
   bAdded=TRUE; BpT"~4oV5  
   KeyCount++; qj?2%mK`  
   break; Sa]Ek*  
  } V 4qtaHf  
 } 5RA<Z.  
 return bAdded; o+)A'S  
} /)1v9<vM"  
]XrE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (zah890//  
{ Uu2N9.5  
 BOOL bRemoved=FALSE; ha'qIT 3&  
 for(int index=0;index<MAX_KEY;index++){ 2uu[52H8d%  
  if(hCallWnd[index]==hWnd){ [V< 1_zqt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5~\Kj#PBx  
    hCallWnd[index]=NULL; N+>'J23d!  
    HotKey[index]=0; O@`J_9  
    HotKeyMask[index]=0; c2b6B.4  
    bRemoved=TRUE; _:,.yRez  
    KeyCount--; w yD%x(  
    break; +Hy4s[_|  
   } xw%)rm<t  
  } GAJ~$AiwHH  
 } x*mc -&N  
 return bRemoved; mq`5w)S)\o  
} T0L+z/N_m.  
A#:8X1w  
void VerifyWindow() u&3EPu  
{ YeIe\3x!N  
 for(int i=0;i<MAX_KEY;i++){ ]N\6h(**wy  
  if(hCallWnd!=NULL){ $5/\Z  
   if(!IsWindow(hCallWnd)){ >)%#V<{<  
    hCallWnd=NULL; 7&t~R}&|  
    HotKey=0; &|,s{?z2  
    HotKeyMask=0; 3LfTGO  
    KeyCount--; C5B=NAc  
   } kbq:U8+k  
  } _SF!T6A  
 } XWF7#xM  
} Rkr^Z?/GH  
1nXqi)&?;  
BOOL CHookApp::InitInstance() 1,u{&%yL"w  
{ QJM(UfHUD  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (wlfMiO  
 hins=AfxGetInstanceHandle(); r03I*b  
 InitHotkey(); ho|  8U  
 return CWinApp::InitInstance(); '^lUL) R  
} 8 DL hk  
4^MSX+zt  
int CHookApp::ExitInstance() ^^Bm$9  
{ Uf[T_  
 VerifyWindow(); )6C`&Mj  
 UnInit(); $:]tcY-L9  
 return CWinApp::ExitInstance(); $nc, ?)i!  
} 9C1b^^Kb  
^(m0M$Wk*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {*nEKPq(_*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _3KZME  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ z qO$  
#if _MSC_VER > 1000 Lkp&;+  
#pragma once v+7*R)/  
#endif // _MSC_VER > 1000 9g+UJ\u^  
m\} =4b  
class CCaptureDlg : public CDialog !a)s`  
{ $*aE$O6l  
 // Construction xrX?ZJ  
 public: Dwk$CJb3-  
  BOOL bTray; /\TlO.B=  
  BOOL bRegistered; rN'.&;Y5  
  BOOL RegisterHotkey(); &V FjH W  
  UCHAR cKey; |Pj9ZG#  
  UCHAR cMask; ]#M/$?!]g2  
  void DeleteIcon(); B{N=0 cSi  
  void AddIcon(); 1 O- E],  
  UINT nCount; ^h"n03VFA  
  void SaveBmp(); XzN-slu!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [ArO$X3\  
  // Dialog Data bA0uGLc  
  //{{AFX_DATA(CCaptureDlg) O '@m4@L   
  enum { IDD = IDD_CAPTURE_DIALOG }; D'85VZEFyo  
  CComboBox m_Key; oFwG+W /  
  BOOL m_bControl; widI s[ )  
  BOOL m_bAlt; )fy <P;g  
  BOOL m_bShift; ;4R =eI  
  CString m_Path; A &;EV#]ge  
  CString m_Number; Y]M^n&f  
  //}}AFX_DATA ;*"!:GR%h  
  // ClassWizard generated virtual function overrides ''%;EW>  
  //{{AFX_VIRTUAL(CCaptureDlg) #efqG=q  
 public: %h3L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); k>$FT `  
 protected: EI%M Azj}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %e(9-M4*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); k62$:9`5  
  //}}AFX_VIRTUAL QR|XV%$  
  // Implementation A4}JZi6@  
 protected: IsWcz+1n  
  HICON m_hIcon; ^#}dPGm  
  // Generated message map functions [U% .Gi  
  //{{AFX_MSG(CCaptureDlg) ef^Cc)S-Q  
  virtual BOOL OnInitDialog(); 1mY+0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0I(uddG3  
  afx_msg void OnPaint(); ntDRlX  
  afx_msg HCURSOR OnQueryDragIcon(); %GNUnr$  
  virtual void OnCancel(); Z={D0`  
  afx_msg void OnAbout(); [..,(  
  afx_msg void OnBrowse(); xcAF  
  afx_msg void OnChange(); V@ LN 1|  
 //}}AFX_MSG `WP@ZSC6  
 DECLARE_MESSAGE_MAP() |R[v@c`pn  
}; d*]Dv,#X  
#endif d'x<- l9  
&NlS  =  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -B<O_*wOj  
#include "stdafx.h" }g%KvYB_  
#include "Capture.h" _ .-o%6  
#include "CaptureDlg.h" u-8X$aJ  
#include <windowsx.h> "sz.v<F0:s  
#pragma comment(lib,"hook.lib") y|FBYcn#F  
#ifdef _DEBUG v@F|O8t:s  
#define new DEBUG_NEW E_ o{c5N  
#undef THIS_FILE %kF TnXHK  
static char THIS_FILE[] = __FILE__; 200L  
#endif ./7&_9| <  
#define IDM_SHELL WM_USER+1 }<6oFUZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T][-'0!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bbE bf !E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D2>hMc  
class CAboutDlg : public CDialog 4.,KEt'H  
{ <K=@-4/Bp  
 public: Eqz4{\   
  CAboutDlg(); ?|%\<h@;  
  // Dialog Data TBoM{s=.  
  //{{AFX_DATA(CAboutDlg) z Y$X|= f  
  enum { IDD = IDD_ABOUTBOX }; "3U{h]  
  //}}AFX_DATA j;ff } b  
  // ClassWizard generated virtual function overrides 4iYgs-,  
  //{{AFX_VIRTUAL(CAboutDlg) o(B<!ji~'  
 protected: J=f:\]@Oy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v_?s1+w  
  //}}AFX_VIRTUAL owfp^hla  
  // Implementation B2ek&<I7N  
 protected: g:G%Ei~sF  
  //{{AFX_MSG(CAboutDlg) "N?%mCPI  
  //}}AFX_MSG #i`A4D  
  DECLARE_MESSAGE_MAP() d,GtH)(s  
}; [u`17hyX  
o 2[vM$]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z5|e\Z  
{ hLDch5J5~  
 //{{AFX_DATA_INIT(CAboutDlg) c+,7Zu!  
 //}}AFX_DATA_INIT x>1iIpBv^  
} aB$y+`f)@  
]Ssw32yn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VJ~X#Q  
{ k"Z"$V2i  
 CDialog::DoDataExchange(pDX); QN{}R;s  
 //{{AFX_DATA_MAP(CAboutDlg) Q1O_CC}  
 //}}AFX_DATA_MAP p=mCK@  
} v!pj v%  
l|R<F;|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N$=(1`zM=  
 //{{AFX_MSG_MAP(CAboutDlg) ;~'cITL  
 // No message handlers 7- *( a  
 //}}AFX_MSG_MAP }[=xe(4]D  
END_MESSAGE_MAP() I =tyQ`  
4 ~MJ4:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Zq\RNZ}  
: CDialog(CCaptureDlg::IDD, pParent) 2$j Ot}  
{ AHp830\  
 //{{AFX_DATA_INIT(CCaptureDlg) :{TmR3.  
  m_bControl = FALSE; lRa 3v Ng  
  m_bAlt = FALSE; Q`@$j,v  
  m_bShift = FALSE; '%n<MTL  
  m_Path = _T("c:\\"); w (vE2Y ?  
  m_Number = _T("0 picture captured."); ,w9#%=xE  
  nCount=0; O X5Co <u  
  bRegistered=FALSE; zAkc 67:  
  bTray=FALSE; `wn<3#  
 //}}AFX_DATA_INIT 0i5T] )r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 a=:{{\1o  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); EMVoTW)z  
} =ELDJt  
*MnG-\{j  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pr[B$X .V  
{ i&}zcGC  
 CDialog::DoDataExchange(pDX); tn:/pPap  
 //{{AFX_DATA_MAP(CCaptureDlg) ~7,2N.vO2  
  DDX_Control(pDX, IDC_KEY, m_Key); azR;*j8Q'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); QKUBh-QFK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6 h0U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9rpg10/T  
  DDX_Text(pDX, IDC_PATH, m_Path); He0N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `\RX~ $^  
 //}}AFX_DATA_MAP nyl8=F:V  
} 3gPD(r1g  
E.H,1 {  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .@8m\  
//{{AFX_MSG_MAP(CCaptureDlg) %X0NHta ~@  
 ON_WM_SYSCOMMAND() l~Ie#vak  
 ON_WM_PAINT() 9A* ?E  
 ON_WM_QUERYDRAGICON() <.AC=4@V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YjX!q]56  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ; $ ?jR c  
 ON_BN_CLICKED(ID_CHANGE, OnChange) oM18aR&  
//}}AFX_MSG_MAP -hU>1ux&V  
END_MESSAGE_MAP() {l*&l2  
?sjZ13 SUa  
BOOL CCaptureDlg::OnInitDialog() :cmI"Bo  
{ aCYm$6LmA  
 CDialog::OnInitDialog(); w ~L\Ebg  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); JK:mQ_  
 ASSERT(IDM_ABOUTBOX < 0xF000); mNnw G);$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \AtwO  
 if (pSysMenu != NULL) Ddm76LS  
 { ~f]r>jQM  
  CString strAboutMenu; syC"eH3{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2 l[A=Z  
  if (!strAboutMenu.IsEmpty()) iw~V_y4  
  { VM2@{V/=~  
   pSysMenu->AppendMenu(MF_SEPARATOR); HgSmAziv  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >Xh(`^}SQ*  
  } )-6s7  
 } '4^V4i  
 SetIcon(m_hIcon, TRUE); // Set big icon _;J9q}X  
 SetIcon(m_hIcon, FALSE); // Set small icon a7v[l04  
 m_Key.SetCurSel(0); CyK$XDHa  
 RegisterHotkey(); w /W Cj4`  
 CMenu* pMenu=GetSystemMenu(FALSE); fN"oa>X  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -'H+lrmv  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Br ^rK}|l  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !OZh fMVd  
 return TRUE; // return TRUE unless you set the focus to a control ^ ]6  80h  
} ~&[P` Z$  
n?P 5pJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $?/Xk%d+  
{ @)2V"FE4i  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @R OY}CZ{/  
 { $R$c1C'oX  
  CAboutDlg dlgAbout; CI,`R&=xO  
  dlgAbout.DoModal(); evmEX<N  
 } wD?=u\% &  
 else |jaY[_ .@  
 { n;k97>m${x  
  CDialog::OnSysCommand(nID, lParam); 9+is?Pj  
 } jC Kt;lj  
} ^/d^$  
y~A7pzBZ=  
void CCaptureDlg::OnPaint() NKUI! [  
{ $vGEY7,  
 if (IsIconic()) Ni@e/| 2b  
 { :UhFou_D4l  
  CPaintDC dc(this); // device context for painting 6kF uMtjc  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'G3OZj8  
  // Center icon in client rectangle $m: a-.I  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0rm;)[SjF  
  int cyIcon = GetSystemMetrics(SM_CYICON); F;Xq:e8  
  CRect rect; xXU/m|  
  GetClientRect(&rect); +|"n4iZ!)  
  int x = (rect.Width() - cxIcon + 1) / 2; DN 8pJa  
  int y = (rect.Height() - cyIcon + 1) / 2; &!YH"{b  
  // Draw the icon qnfRN'  
  dc.DrawIcon(x, y, m_hIcon); ?n9$,-^v  
 } ma-Y'  
 else pTX'5   
 { !VJa$>,  
  CDialog::OnPaint(); yxP?O@(  
 } \lbiz4^>  
} \IZ4( Z  
Tvx8l m '  
HCURSOR CCaptureDlg::OnQueryDragIcon() (&]15 FJ$1  
{ &G,o guo  
 return (HCURSOR) m_hIcon; 6 % y)  
} vS t=Ax3]  
$9i5<16  
void CCaptureDlg::OnCancel() XX[Wwt  
{ F",abp!  
 if(bTray) $9_.Q/9>  
  DeleteIcon(); j5Wx*~@(  
  CDialog::OnCancel(); 3F'dT[;  
} x>9EVa)  
yzNX2u1  
void CCaptureDlg::OnAbout() ]ifHA# z`~  
{ D_ZBx+/_?  
 CAboutDlg dlg; S,tVOxs^  
 dlg.DoModal(); E)_!Hi0<s  
} \HQb#f,  
*-!ndbf  
void CCaptureDlg::OnBrowse() H6JMN1#t$  
{ Jx9%8Ek  
 CString str; vzm4  
 BROWSEINFO bi; E|4XQ|B@  
 char name[MAX_PATH]; 2V"gqJHv  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); n`KXJ?t  
 bi.hwndOwner=GetSafeHwnd(); |AfQ_iT6c  
 bi.pszDisplayName=name; \\G6c4 fC  
 bi.lpszTitle="Select folder"; ,M h/3DPgE  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; O/^w! :z'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dDn4nwH  
 if(idl==NULL) PRlo"kN  
  return; 8v=47G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); IC-xCzR  
 str.ReleaseBuffer(); y{?jr$js<  
 m_Path=str; FuiW\=^  
 if(str.GetAt(str.GetLength()-1)!='\\') {uM{5GSL  
  m_Path+="\\"; ;_\  
 UpdateData(FALSE); pbvEIa-Y4  
} 5)v^ cR?&  
gwz _b  
void CCaptureDlg::SaveBmp() Qn3+bF4  
{ ;,})VoC\!  
 CDC dc; %dU'$)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =+=|{l?F  
 CBitmap bm; RH4n0 =2  
 int Width=GetSystemMetrics(SM_CXSCREEN); "l,EcZRjTz  
 int Height=GetSystemMetrics(SM_CYSCREEN); Lm{ o=v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 99>yaW  
 CDC tdc; H.[&gm}p>  
 tdc.CreateCompatibleDC(&dc); F}.TT =((8  
 CBitmap*pOld=tdc.SelectObject(&bm); 2_\|>g|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %` [`I>  
 tdc.SelectObject(pOld); +\oHQ=s>}\  
 BITMAP btm; molowPI  
 bm.GetBitmap(&btm); hJ*E"{xs  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gO%i5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); > ,Bu^] C  
 BITMAPINFOHEADER bih; Xl+a@Ggtq  
 bih.biBitCount=btm.bmBitsPixel; =l'_*B8  
 bih.biClrImportant=0; "#k(V=y  
 bih.biClrUsed=0; #*M$,ig  
 bih.biCompression=0; RS02>$jo  
 bih.biHeight=btm.bmHeight; ye7&y4v+  
 bih.biPlanes=1; N,,2 VSUr  
 bih.biSize=sizeof(BITMAPINFOHEADER); <_q/ +x]8  
 bih.biSizeImage=size; Q4 :r$ &  
 bih.biWidth=btm.bmWidth; 0a%ui2k  
 bih.biXPelsPerMeter=0; 9S1V! Jp  
 bih.biYPelsPerMeter=0; OjEA;;qq  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @VS5Mg8  
 static int filecount=0; knzED~ v@(  
 CString name; )-"L4TC)  
 name.Format("pict%04d.bmp",filecount++); *dTf(J  
 name=m_Path+name; o5 XUDDi  
 BITMAPFILEHEADER bfh; uPv?Hq  
 bfh.bfReserved1=bfh.bfReserved2=0; SfFR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); F^G`Jf  
 bfh.bfSize=54+size; Qu\l$/  
 bfh.bfOffBits=54; 5o ^=~  
 CFile bf; qWRMwvN{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FOG+[v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L [M8[~Hy  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {$:13AnK   
  bf.WriteHuge(lpData,size); h#ot)m|I  
  bf.Close(); E+Mdl*  
  nCount++; b}*bgx@<  
 } &Q+V I/p  
 GlobalFreePtr(lpData); ',j-n$Z^=  
 if(nCount==1) BD#;3?|  
  m_Number.Format("%d picture captured.",nCount); d$~b`  
 else L/LN X{|  
  m_Number.Format("%d pictures captured.",nCount); l>?vjy65  
  UpdateData(FALSE); DkKD~  
}  /?xn  
9cj-v}5j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \^LR5S&  
{ {/!Gh\i  
 if(pMsg -> message == WM_KEYDOWN) vkgL"([_  
 { 2A ,36,  
  if(pMsg -> wParam == VK_ESCAPE) BVp.A]  
   return TRUE; K3D $ hb  
  if(pMsg -> wParam == VK_RETURN) '+zsj0!A  
   return TRUE; ahv=HWX k  
 } oA@^N4PD  
 return CDialog::PreTranslateMessage(pMsg); k ,(:[3J  
} i~L7h=__  
;_&L^)~P$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3*JybMo"  
{ >G~;2K[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MA6%g} o  
  SaveBmp(); S c Kfr  
  return FALSE; tb\pjLB][  
} 8!>pFVNJf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AR3=G>hO,  
 CMenu pop; L"/ato  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D9C; JD  
 CMenu*pMenu=pop.GetSubMenu(0); CnYX\^Ow  
 pMenu->SetDefaultItem(ID_EXITICON); rWqA)j*!  
 CPoint pt; m/nn}+*C  
 GetCursorPos(&pt); $?{zV$r1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I GtH<0Du  
 if(id==ID_EXITICON) n_meJm.  
  DeleteIcon(); BZshTP[`  
 else if(id==ID_EXIT) 5xUPqW%3  
  OnCancel(); wJkkc9Rh'(  
 return FALSE; 2]ljm] \l  
} +]vl8, 4@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iW~f  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) vy?YA-  
 AddIcon(); e5KF~0`  
 return res; # t Ki6u  
} ,_zt? o\  
Mv =;+?z!  
void CCaptureDlg::AddIcon() \s'6)_  
{ ?0Zw ^a  
 NOTIFYICONDATA data; _ 0E,@[  
 data.cbSize=sizeof(NOTIFYICONDATA); xII!2.  
 CString tip; ]XyJ7esg  
 tip.LoadString(IDS_ICONTIP); So`"z[5  
 data.hIcon=GetIcon(0); R&xd ic!  
 data.hWnd=GetSafeHwnd(); g XMkI$ab  
 strcpy(data.szTip,tip); [?*^&[  
 data.uCallbackMessage=IDM_SHELL; L 3@wdC ~0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; heA\6W:u&  
 data.uID=98; jqedHn x  
 Shell_NotifyIcon(NIM_ADD,&data); |-D.  
 ShowWindow(SW_HIDE); 0fU>L^P_?  
 bTray=TRUE; "O "@HVF@  
} -',Y;0b%  
h%S#+t(Bf  
void CCaptureDlg::DeleteIcon() -wRzMT19MG  
{ d*HAKXd&:j  
 NOTIFYICONDATA data; JH#+E04#  
 data.cbSize=sizeof(NOTIFYICONDATA); cTp+M L  
 data.hWnd=GetSafeHwnd(); bxq`E!]  
 data.uID=98; cgOoQP/#  
 Shell_NotifyIcon(NIM_DELETE,&data); K? k`U,  
 ShowWindow(SW_SHOW); FG\?_G  
 SetForegroundWindow(); %xz02$k  
 ShowWindow(SW_SHOWNORMAL); # 95/,k  
 bTray=FALSE; q%Pnx_RB  
} m(Ynl=c  
[4yQ-L)]e  
void CCaptureDlg::OnChange() a\E]ueVD2j  
{ _A r ,]v  
 RegisterHotkey(); ;@hP*7Lm  
} Qafg/JU  
b87o6"j  
BOOL CCaptureDlg::RegisterHotkey() +\chHOsw  
{ C@i g3fhV  
 UpdateData(); s2WB4U k  
 UCHAR mask=0; ps{(UYM=b  
 UCHAR key=0; qcF{Kex"  
 if(m_bControl) ~Y[1Me  
  mask|=4; QCw<* Id+  
 if(m_bAlt) WAbhB A  
  mask|=2; l1 S1CS  
 if(m_bShift) K<tg+(3  
  mask|=1; m<4Lo0?nS  
  key=Key_Table[m_Key.GetCurSel()]; ZxW V ,s&p  
 if(bRegistered){ Op{Mc$5a  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $@Fj_ N  
  bRegistered=FALSE; j;.&+.  
 } a\MJbBXv  
 cMask=mask; 3Y8 V?* 1|  
 cKey=key; Z# 04 ]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Tw5BvB1  
 return bRegistered; }s[/b"%y  
} ]\U'_G2]  
\Wk$>?+#@  
  四、小结 [geY:v_B  
CiSG=obw  
  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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