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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: m6BIQ(l  
  SRl:+!@.  
  一、实现方法 Z!TLWX "  
u>Z0ug6x  
  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: N[ %^0T$  
DLYk#d: q?  
#pragma data_seg("shareddata") h+k:G9;sS  
HHOOK hHook =NULL; //钩子句柄 ^$):Xz  
UINT nHookCount =0; //挂接的程序数目 'CT 8vt;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O:fv1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !>B|z=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8LP L4l  
static int KeyCount =0; ;BV1E|j  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /TTmMx*  
#pragma data_seg() B$aA=+<S  
SxLu<  
  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。 "d'D:>z]%  
Rh-e C6P  
  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: :ND5po#(  
@Otom'O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =Mb!&qq  
cKey,UCHAR cMask) fu3/n@L  
{ >3V{I'^^-  
 BOOL bAdded=FALSE; q.0a0 /R  
 for(int index=0;index<MAX_KEY;index++){ / %}Xiqlrd  
  if(hCallWnd[index]==0){ EnXNTat})  
   hCallWnd[index]=hWnd; 6q ._8%  
   HotKey[index]=cKey; Al="ss&2  
   HotKeyMask[index]=cMask; mG2*s ^$  
   bAdded=TRUE; $pK2H0c  
   KeyCount++; JQQP!]%}  
   break; Fyy)665x/  
  } [(U:1&x &  
 } X>^St&B}fC  
 return bAdded; (j;s6g0  
} L.XGD|m  
//删除热键 x 5vvY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >%k:+ +b{  
{ _|`~CLE[  
 BOOL bRemoved=FALSE; ,)3%@MwO  
 for(int index=0;index<MAX_KEY;index++){ [k-Q89  
  if(hCallWnd[index]==hWnd){ %EA|2O.D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s(W]>Ib  
    hCallWnd[index]=NULL; '+LbFGrO3  
    HotKey[index]=0; ca/AScL  
    HotKeyMask[index]=0; fQcJyX  
    bRemoved=TRUE; S%zn {1F  
    KeyCount--; :/ ,h)h)|  
    break; 7M*&^P\}es  
   } zi l^^wT0J  
  } hw/ :  
 } ]cvP !  
 return bRemoved;  }t}y  
}  nen(  
+6tj w 6  
mOG;[CB  
  DLL中的钩子函数如下: \^O&){q(9  
1sgI,5liUs  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OKs1irt5  
{ *;7~aM  
 BOOL bProcessed=FALSE; K*^3FO}JG  
 if(HC_ACTION==nCode) CN4Q++{  
 { JgQ,,p_V?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4X tIMa28  
   switch(wParam) EaaLN<i@0  
   {  : p# 5nYi  
    case VK_MENU: 'jAX&7G`  
     MaskBits&=~ALTBIT; qKu/~0a/  
     break; JB.f7-  
    case VK_CONTROL: M?mPi 3  
     MaskBits&=~CTRLBIT; .YYfba#{  
     break; ,@1rP55  
    case VK_SHIFT: ZoJ_I >uv  
     MaskBits&=~SHIFTBIT; J:g4ES-/   
     break; ?`ETlFtD4  
    default: //judge the key and send message .|Unq`ll  
     break; 6v(?Lr`D  
   } 1vw [{.wC  
   for(int index=0;index<MAX_KEY;index++){ z2'3P{#s  
    if(hCallWnd[index]==NULL) aQzDOeTi  
     continue; ,gAa9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (JV [7u -  
    { ZBYFQTEE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A=8%2U wI  
     bProcessed=TRUE; WUnz  
    } e$'|EE.=q+  
   } |6@s6]%X}  
  } <k59Ni9  
  else if((lParam&0xc000ffff)==1){ //有键按下 )Iu0MN&  
   switch(wParam) >1luLp/,$  
   { klpYtQ  
    case VK_MENU: })~M}d2LXB  
     MaskBits|=ALTBIT; yR?S]   
     break; {v CB$@/o  
    case VK_CONTROL: ;1x(~pD*o  
     MaskBits|=CTRLBIT; =+>cTV  
     break; Cn6<I{`\  
    case VK_SHIFT: R^u 1(SF  
     MaskBits|=SHIFTBIT; O7DaVlln  
     break; n{'LF #4l  
    default: //judge the key and send message f8ucJ.{"  
     break; >#pZ`oPEAv  
   } {v3?.a$ u  
   for(int index=0;index<MAX_KEY;index++){ P _e9>t@  
    if(hCallWnd[index]==NULL) >+}yI}W;e  
     continue; Tfsx&k\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Lt'FA  
    { LT+QW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /:S&1'=  
     bProcessed=TRUE; 3` ,u^ w  
    } p;nRxi7'  
   } o'Rr2,lVi  
  } 3 UXaA;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7 LotN6H  
   for(int index=0;index<MAX_KEY;index++){ ^:hI bF4G  
    if(hCallWnd[index]==NULL) NgI n\) =0  
     continue; OoIs'S-Z#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4$W}6 v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .|?UqZ(,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c+a"sx\  
   } yyZs[5Q  
  } QVT|6znw  
 } )h0 3sv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B7QuSo//  
} {pJf ~  
|f+`FOliP  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /+ yIcE(&3  
58]C``u@Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OV>JmYe1{/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;*+wg5|  
^uCZO  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: -d+o\qp"#  
8?l/x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yq6Gyoi<  
{ TmEJ!)*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DH IC:6EY  
 { ja2BK\"1:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 eN,6p '&  
  SaveBmp(); 6B8g MO  
  return FALSE; &m5FYm\  
 } ^}Wk  
 …… //其它处理及默认处理 !pJd^|4A]  
} ?"@`SEdnU2  
]=Tle&yM+T  
59k[A~)~  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 XbaUmCuh  
*xV  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9YQYg@+R  
x?6 \C-i  
  二、编程步骤 br3r!Vuz/-  
fVvB8[(;~  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; k=&UV!J  
K| w\KX0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 07 E9[U[  
;${_eab ]  
  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; pP|LSr Y!  
A6S|pO1)3  
  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; L]e@. /C$  
\2#j1/d4  
  5、 添加代码,编译运行程序。 l>D!@`><I  
xf|vz|J?y  
三、程序代码 jCK 0+,;  
8M6wc394  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &P:2`\'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~TfN*0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @3v[L<S{  
#if _MSC_VER > 1000 EvGKcu  
#pragma once g3*J3I-O  
#endif // _MSC_VER > 1000 bAwFC2jO[  
#ifndef __AFXWIN_H__ }trQ<*D  
#error include 'stdafx.h' before including this file for PCH `:*O8h~i^8  
#endif ?#0m[k&`  
#include "resource.h" // main symbols 0J z|BE3Y  
class CHookApp : public CWinApp Qz4n%|  
{ h8 !(WO!  
 public: o |"iW" +  
  CHookApp(); ^&!iqK2o  
  // Overrides /cC4K\M  
  // ClassWizard generated virtual function overrides H[J5A2b  
  //{{AFX_VIRTUAL(CHookApp) OhW o  
 public: =IEei{  
  virtual BOOL InitInstance(); XGcl9FaO}  
  virtual int ExitInstance(); Mh@RO|F  
  //}}AFX_VIRTUAL LXq0hI  
  //{{AFX_MSG(CHookApp) S4C4_*~Vd  
  // NOTE - the ClassWizard will add and remove member functions here. njGZ#{"eC  
  // DO NOT EDIT what you see in these blocks of generated code ! q]rqFP0C  
  //}}AFX_MSG e13' dCG  
  DECLARE_MESSAGE_MAP() 78h!D[6  
}; AYHefAF<w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); J`'wprSBb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h=o%\F4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p/ au.mc  
BOOL InitHotkey(); Mh"vH0\Lj  
BOOL UnInit(); kJNu2S  
#endif c.{t +OR  
j|w_BO 9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  YF$nL(  
#include "stdafx.h" h { M=V  
#include "hook.h" W8N__  
#include <windowsx.h> s<'WTgy1i  
#ifdef _DEBUG #McX  
#define new DEBUG_NEW t2hI^J0y  
#undef THIS_FILE <d~IdK'\x  
static char THIS_FILE[] = __FILE__; F x3X  
#endif 7OdJ&Gzd  
#define MAX_KEY 100 /;;$9O9  
#define CTRLBIT 0x04 "}^}3"/.  
#define ALTBIT 0x02 Z_ (P^/  
#define SHIFTBIT 0x01 p"|0PlW  
#pragma data_seg("shareddata") ?F^O7\rw  
HHOOK hHook =NULL; $0,lE+7*  
UINT nHookCount =0; z|v/h UrD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5-! Zm]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q=?YY-*$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \qw1\-q  
static int KeyCount =0; q vGP$g  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [W Ud9fUL  
#pragma data_seg() z+{Q(8'b]  
HINSTANCE hins; v<:/u(i  
void VerifyWindow(); _r?.%] \.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) m~RMe9Qi  
//{{AFX_MSG_MAP(CHookApp) I'c rH/z9  
// NOTE - the ClassWizard will add and remove mapping macros here. )~C+nb '6/  
// DO NOT EDIT what you see in these blocks of generated code! 4O '%$6KR(  
//}}AFX_MSG_MAP ,jJbQIu#  
END_MESSAGE_MAP() WVdF/H  
@XN*H- |  
CHookApp::CHookApp() ;t \C!A6  
{ # 5b   
 // TODO: add construction code here, 6g 5Lf)yG  
 // Place all significant initialization in InitInstance V!zU4!@qP  
} m/p:W/0L  
eD)@:K  
CHookApp theApp; :$^cY>o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ( P\oLr9  
{ &w{: qBa  
 BOOL bProcessed=FALSE; a]t| /Mq  
 if(HC_ACTION==nCode) wvPS0]  
 { ^-g-]?q  
  if((lParam&0xc0000000)==0xc0000000){// Key up B j z@X  
   switch(wParam) j% Wip j;c  
   { m:]60koz]o  
    case VK_MENU: dw3H9(-lp  
     MaskBits&=~ALTBIT;  `s~[q  
     break; u$ a7  
    case VK_CONTROL: ';KZ.D  
     MaskBits&=~CTRLBIT; P$Fq62;}r4  
     break; DlxL:  
    case VK_SHIFT: <>R\lPI2  
     MaskBits&=~SHIFTBIT; 66l+cb  
     break; IaYaIEL-  
    default: //judge the key and send message g n 6@x  
     break; C o,"  
   } `FRdo  
   for(int index=0;index<MAX_KEY;index++){ arb'.:[z^  
    if(hCallWnd[index]==NULL) !b?`TUt   
     continue; gbT1d:T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H57wzG{xG  
    { `8b4P>';O'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n|) JhXQ  
     bProcessed=TRUE; p#>d1R1&  
    } MxLi'R=  
   } N6w!V]b  
  } i ?]`9z  
  else if((lParam&0xc000ffff)==1){ //Key down (dQsR sA  
   switch(wParam) B; r` 1 G  
   { sg8j}^VI  
    case VK_MENU: +.IncY8C$  
     MaskBits|=ALTBIT; 3GM9ZPeN:  
     break; Km!~zG7<  
    case VK_CONTROL: NzG] nsw  
     MaskBits|=CTRLBIT; *s6(1 S  
     break; rk< 3QXv  
    case VK_SHIFT: p$}1V2h;  
     MaskBits|=SHIFTBIT; #KwK``XC 4  
     break; :za:gs0  
    default: //judge the key and send message W ,|JocDq  
     break; e)2w&2i`(F  
   } -b'a-?  
   for(int index=0;index<MAX_KEY;index++) B;^YHWJ6i  
   { d/l>~%bR  
    if(hCallWnd[index]==NULL) D:fLQ8a  
     continue; ebIRXUF}>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C$7dmGjZ  
    { (x/xqDpmBS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *7^w}v+.  
     bProcessed=TRUE; p[:E$#W~;  
    } {/q4W; D  
   } xF7q9'/F  
  } E2( {[J  
  if(!bProcessed){ C~8;2/F7  
   for(int index=0;index<MAX_KEY;index++){ f<Xi/ (  
    if(hCallWnd[index]==NULL) A)641"[  
     continue; 6 i'kc3w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) );1UbqVPD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '-vzQd@y  
   } <XH,kI(%  
  } u8Oo@xf0Fr  
 } on)$y&lu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); BOWR}n!g  
} `m=u2kxY  
9q>rUoK^  
BOOL InitHotkey() @%4tWE  
{ i3U_G^8  
 if(hHook!=NULL){ Ztj~Q9mu  
  nHookCount++; Z=[?T f  
  return TRUE; !R3ZyZcX  
 } Y!fgc<]'&  
 else xL} ~R7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); m$80D,3  
  if(hHook!=NULL) #ByrX\  
   nHookCount++; sX|bp)Nw  
  return (hHook!=NULL); 8mv}-;  
} qN(,8P\90  
BOOL UnInit() ]n^TN r7  
{ (cdtUE8  
 if(nHookCount>1){ taqmtXU=(  
  nHookCount--; :2E?|}`7\  
  return TRUE; /6nj 4.xxc  
 } t{o&$s93  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ob m%\h  
 if(unhooked==TRUE){ Y(Q!OeC  
  nHookCount=0; OpxJiu=W  
  hHook=NULL; al{}p  
 } &]P1IQ  
 return unhooked; =`KV),\  
} G_)(?  
$\vTiS'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~#nbD-*#  
{ uJu#Vr:m  
 BOOL bAdded=FALSE; 'X/(M<c  
 for(int index=0;index<MAX_KEY;index++){ 7MhN>a;A\  
  if(hCallWnd[index]==0){ XS`=8FQ  
   hCallWnd[index]=hWnd; $p~X"f?0  
   HotKey[index]=cKey; {p)=#Jd`.P  
   HotKeyMask[index]=cMask; ;SVAar4r  
   bAdded=TRUE; !1fAW! 8  
   KeyCount++; }8)iFP&"  
   break; +nm?+ F  
  } >%Nqgn$V  
 } khS >  
 return bAdded; boWaH}?0'  
} ~pve;(e=  
5_E,x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,'^^OLez  
{ `cn}}1Lg]  
 BOOL bRemoved=FALSE; i[rXs/]  
 for(int index=0;index<MAX_KEY;index++){ Lk:Sju  
  if(hCallWnd[index]==hWnd){ '1[Bbs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4j VFzO%.  
    hCallWnd[index]=NULL; #SIIhpjA(  
    HotKey[index]=0; K f}h{X  
    HotKeyMask[index]=0; >gGdzL  
    bRemoved=TRUE; L6IF0`M<,I  
    KeyCount--; eO?@K$I  
    break; - A)XYz  
   } " UxKG+   
  } M;zJ1  
 } M?m)<vMr*  
 return bRemoved; .C?rToCY  
} c/ s$*"  
^yp`<=  
void VerifyWindow() i)mQ?Y#o  
{ \*.u (8~2o  
 for(int i=0;i<MAX_KEY;i++){ $zYo~5M?i-  
  if(hCallWnd!=NULL){  SE D_^  
   if(!IsWindow(hCallWnd)){ d;WXlE;  
    hCallWnd=NULL; z57|9$h}w  
    HotKey=0; >4x~US[VB  
    HotKeyMask=0; rWnZIt"  
    KeyCount--; U1~6o"1H  
   } +u]L# ].;  
  } gaa;PX  
 } #(f- cK  
} @-H D9h  
_ tO:,%dL  
BOOL CHookApp::InitInstance() (Aw!K`0Y1  
{ Kta7xtu  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4M{]YZMw8  
 hins=AfxGetInstanceHandle(); 6$_//  
 InitHotkey(); A.>TD=Nz  
 return CWinApp::InitInstance(); F` "bMS  
} 2j( ]Bt:  
'D<84|w:1  
int CHookApp::ExitInstance() X4dXO5\  
{ H6/C7  
 VerifyWindow(); AW< z7B D  
 UnInit(); /%9CR'%*c  
 return CWinApp::ExitInstance(); sV5S>*A[  
} `(6g87h  
"Z70 jkW[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c>pbRUMH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W^Z#_{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @A;Ouu(  
#if _MSC_VER > 1000 Bgy?k K2[  
#pragma once ,)](h+zl_6  
#endif // _MSC_VER > 1000 l d@B  
|JRaskd  
class CCaptureDlg : public CDialog <$ oI  
{ ( V^C7ix:  
 // Construction b am*&E%0K  
 public: Z9vJF.clO  
  BOOL bTray; /\C5`>x  
  BOOL bRegistered; ? > 7SZiC`  
  BOOL RegisterHotkey(); R<AT}!mkR  
  UCHAR cKey; 6i.!C5YX]  
  UCHAR cMask; `-QY<STTP9  
  void DeleteIcon(); y4Fuh nb>  
  void AddIcon(); [yf&]0  
  UINT nCount; g?=|kp  
  void SaveBmp(); %}x$YD O  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =V(|3?N  
  // Dialog Data AKkr )VgY  
  //{{AFX_DATA(CCaptureDlg) |ZBHXv  
  enum { IDD = IDD_CAPTURE_DIALOG }; Rd^X.  
  CComboBox m_Key; -|aNHZr  
  BOOL m_bControl; sUEvL( %nY  
  BOOL m_bAlt; BiI}JEp4o  
  BOOL m_bShift; 0b~{l;  
  CString m_Path; NP?hoqeKs  
  CString m_Number; ;&8  
  //}}AFX_DATA O2 sAt3'  
  // ClassWizard generated virtual function overrides 4~YPLu  
  //{{AFX_VIRTUAL(CCaptureDlg)  q{*4BL'  
 public: 6}xFE]Df-Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^g eC?m  
 protected: }:f \!b  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |r%lJmBB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); xHo iu$i6  
  //}}AFX_VIRTUAL C. rLog#  
  // Implementation VvJ]*D+e  
 protected: *4oj' }  
  HICON m_hIcon; tH\ aHU[  
  // Generated message map functions U6M3,"?  
  //{{AFX_MSG(CCaptureDlg) oiL^$y/:;z  
  virtual BOOL OnInitDialog(); @& vtY._  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2^.qKY@g@  
  afx_msg void OnPaint(); ZN]LJ4|xu  
  afx_msg HCURSOR OnQueryDragIcon(); Am&PH(}L  
  virtual void OnCancel(); ?.%'[n>P  
  afx_msg void OnAbout(); ?}D|]i34  
  afx_msg void OnBrowse(); 1y)|m63&  
  afx_msg void OnChange(); >nA6w$  
 //}}AFX_MSG @+(TM5Ub  
 DECLARE_MESSAGE_MAP() Ebk_(Py\  
}; 5l ioL)  
#endif P.Uz[_&l6  
ck"lX[d1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file WUnmUW[/  
#include "stdafx.h" f#3U,n8:  
#include "Capture.h" aHzS>  
#include "CaptureDlg.h" R]y[n;aGC  
#include <windowsx.h> FPB O=?H.  
#pragma comment(lib,"hook.lib") \vR&-+8dk  
#ifdef _DEBUG +o94w^'^$b  
#define new DEBUG_NEW Z F&aV?  
#undef THIS_FILE a&*fk?o  
static char THIS_FILE[] = __FILE__; 43p0k&;-7  
#endif XKEd~2h<y  
#define IDM_SHELL WM_USER+1 )1!jv!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H*M)<"X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]IZn#gnM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ',<B o{  
class CAboutDlg : public CDialog =5QP'Qt{O  
{ 6JYVC>i  
 public: w?LDaSz\t  
  CAboutDlg(); Np?%pB!Q  
  // Dialog Data 6)B6c. 5o  
  //{{AFX_DATA(CAboutDlg) $%ts#56*  
  enum { IDD = IDD_ABOUTBOX }; I8RPW:B;B  
  //}}AFX_DATA xct{Tv[FO  
  // ClassWizard generated virtual function overrides y:>'1"2`  
  //{{AFX_VIRTUAL(CAboutDlg) @! gJOy  
 protected: Hi{1C"%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (E.,kcAJ  
  //}}AFX_VIRTUAL OE4hG xG  
  // Implementation SK @%r  
 protected: 7@@,4_q E  
  //{{AFX_MSG(CAboutDlg) ,(  ?q  
  //}}AFX_MSG I2R" Y<  
  DECLARE_MESSAGE_MAP() G?t<4MT v  
}; yK #9)W-  
jhN]1t /\X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :@H&v%h(u  
{ .*bu:FuDE  
 //{{AFX_DATA_INIT(CAboutDlg) MI,b`pQ  
 //}}AFX_DATA_INIT p[zKc2TPk  
} ?k*%r;e>  
 3~mi  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9Un3La8PX  
{ 86BY032H  
 CDialog::DoDataExchange(pDX); 2zz7/]?Q   
 //{{AFX_DATA_MAP(CAboutDlg) e[(XR_EY  
 //}}AFX_DATA_MAP mEUdJvSG(  
} 0L5 n<<7  
2{sx"/k\A  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^=lh|C\#  
 //{{AFX_MSG_MAP(CAboutDlg) rv\yS:2  
 // No message handlers P!apAr  
 //}}AFX_MSG_MAP wePhH*nQ>  
END_MESSAGE_MAP() *h `P+_Q7  
88GS Bg:YH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z!<X{& e  
: CDialog(CCaptureDlg::IDD, pParent) 0"vI6Lm  
{ %}nNwuJ  
 //{{AFX_DATA_INIT(CCaptureDlg) A=(<g";m  
  m_bControl = FALSE; VT;Vm3\  
  m_bAlt = FALSE; ?Bdhn{_  
  m_bShift = FALSE; \.`;p  
  m_Path = _T("c:\\"); Pr%Y!|  
  m_Number = _T("0 picture captured."); m@z.H;  
  nCount=0; YA:7^-Bv  
  bRegistered=FALSE; %ZajM  
  bTray=FALSE; w'/ Mn+  
 //}}AFX_DATA_INIT ][jW2;A  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 l=*60Ag\J~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); a%"27 n(M  
} !\DlX |  
|\lsTY&2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) / X #4  
{ O_M2Axm  
 CDialog::DoDataExchange(pDX); nF Mc'm  
 //{{AFX_DATA_MAP(CCaptureDlg) lD%Fk3  
  DDX_Control(pDX, IDC_KEY, m_Key); {c;][>l  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); r? w^#V  
  DDX_Check(pDX, IDC_ALT, m_bAlt); N '8u}WO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Y M <8>d  
  DDX_Text(pDX, IDC_PATH, m_Path); vH^6O:V  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 'K L" i  
 //}}AFX_DATA_MAP nI63Ns  
} AO R{Xm  
q$|Wxnz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vSOO[.=  
//{{AFX_MSG_MAP(CCaptureDlg)  MYD`P2F  
 ON_WM_SYSCOMMAND() wc%Wy|d  
 ON_WM_PAINT() h2b,(  
 ON_WM_QUERYDRAGICON() zXop@"(e  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) rY~!hZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,#u"$Hz8p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _DlX F  
//}}AFX_MSG_MAP _:B/XZ  
END_MESSAGE_MAP() hLqRF4>L  
A *$JF>`7  
BOOL CCaptureDlg::OnInitDialog() j;GH|22  
{ vpS&w  
 CDialog::OnInitDialog(); f6I$d<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *v' d1.Z  
 ASSERT(IDM_ABOUTBOX < 0xF000); @Nm;lZK  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qPn }$1+~  
 if (pSysMenu != NULL) kkyi`_ZKn  
 { 6cF~8  
  CString strAboutMenu; E=H>|FgS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); uX!5G:x]  
  if (!strAboutMenu.IsEmpty()) 5Hli@:B2s  
  { J@Qt(rRxi  
   pSysMenu->AppendMenu(MF_SEPARATOR); SWX[|sjdB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l8XgzaW  
  } p>g5WebBN  
 } kK0.j)(  
 SetIcon(m_hIcon, TRUE); // Set big icon VIXY?Ua  
 SetIcon(m_hIcon, FALSE); // Set small icon a'[Ah2}3r<  
 m_Key.SetCurSel(0); e2~$=f-  
 RegisterHotkey(); bvxol\7;  
 CMenu* pMenu=GetSystemMenu(FALSE); @d+NeS  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,EE,W0/zzM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); YR 5C`o  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ke*tLnO  
 return TRUE; // return TRUE unless you set the focus to a control 6D=9J%;  
} u%o]r9xl'  
d;4LHQ0yU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tRl01&0S  
{ g+X .8>=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Rz #&v  
 { ~yGD("X  
  CAboutDlg dlgAbout; #cnh ~O  
  dlgAbout.DoModal(); ($h`Y;4  
 } 2@A%;f0Q  
 else t-gLh(-.  
 { u6B,V  
  CDialog::OnSysCommand(nID, lParam); o4^|n1vN  
 } kK,Ne%}a2K  
} V!{}%;f  
fj7\MTy  
void CCaptureDlg::OnPaint() vhEqHjR:  
{ SU,#:s(  
 if (IsIconic()) ^n@dC?  
 { 5~pQ$-  
  CPaintDC dc(this); // device context for painting 1 +0-VRl  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eTeZ^G  
  // Center icon in client rectangle ef Moi'v  
  int cxIcon = GetSystemMetrics(SM_CXICON); l\HLlwYO  
  int cyIcon = GetSystemMetrics(SM_CYICON); O<RLw)nzg  
  CRect rect; 7gk}f%,3P  
  GetClientRect(&rect); ;v*J:Mn/=  
  int x = (rect.Width() - cxIcon + 1) / 2;  W0&x0  
  int y = (rect.Height() - cyIcon + 1) / 2; NrVE[Z#  
  // Draw the icon )'+ tb\g  
  dc.DrawIcon(x, y, m_hIcon); InAx;2'A:  
 } dr[sSBTY"  
 else xA&RMu&  
 { c)b/"  
  CDialog::OnPaint(); MR?5p8S#g  
 } mw\ z'  
} :j)v=qul  
v7h!'U[/  
HCURSOR CCaptureDlg::OnQueryDragIcon() f*:DH4g }B  
{ |h7 d #V>  
 return (HCURSOR) m_hIcon; B%.vEk)*  
} xk#q_!(j  
w|k?2 ?&  
void CCaptureDlg::OnCancel() x}tg/` .=z  
{ v>[U*E  
 if(bTray) w YEkWB^  
  DeleteIcon(); &c|3v!  
  CDialog::OnCancel(); 4X1!t   
} vOIzfwYG9  
- K@mjN  
void CCaptureDlg::OnAbout() lB(E:{6OZ  
{ <73dXTZ0  
 CAboutDlg dlg; \C&[BQ\  
 dlg.DoModal(); ~0 PR>QJ  
} YAc~,N   
dPm_jX  
void CCaptureDlg::OnBrowse() G2[? b2)8  
{ )@Vz,f\}  
 CString str; k$ORVU  
 BROWSEINFO bi; \{@n >Mh  
 char name[MAX_PATH]; Gkr]8J  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Od,P,t9  
 bi.hwndOwner=GetSafeHwnd(); Fs3rsig  
 bi.pszDisplayName=name; -_KO}_  
 bi.lpszTitle="Select folder"; 9'5`0$,|^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9*<=K  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); u^ 3,~:E  
 if(idl==NULL) JQ~[$OGH  
  return; SJJ[y"GvD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "C/X#y   
 str.ReleaseBuffer(); &Rp/y%9  
 m_Path=str; )ZQ>h{}D  
 if(str.GetAt(str.GetLength()-1)!='\\') gic!yhsS_  
  m_Path+="\\"; T!yI+<  
 UpdateData(FALSE); r-s9]0"7~  
} B*3<(eI  
,pHQv(K/  
void CCaptureDlg::SaveBmp() %@~;PS3kd  
{ TpH-_ft  
 CDC dc; L|*0 A=6  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Dga;GYx  
 CBitmap bm; (X3}&aLF  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9 \lSN5W  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~ubcD6f  
 bm.CreateCompatibleBitmap(&dc,Width,Height); DmA~Vj!a^y  
 CDC tdc; N+9W2n  
 tdc.CreateCompatibleDC(&dc); ?s-Z3{k  
 CBitmap*pOld=tdc.SelectObject(&bm); 5{Oq* |  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _pN:p7l(  
 tdc.SelectObject(pOld); *I6W6y;E=  
 BITMAP btm; wxc24y  
 bm.GetBitmap(&btm); /n3Qcht  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; u==`]\_@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }I3m8A  
 BITMAPINFOHEADER bih; ; "K"S[  
 bih.biBitCount=btm.bmBitsPixel; 1KMSBLx  
 bih.biClrImportant=0; "|^-Yk\U  
 bih.biClrUsed=0; [a[.tR38e  
 bih.biCompression=0; b$JrLZs$_  
 bih.biHeight=btm.bmHeight; 6>Z)w}x^  
 bih.biPlanes=1; N87)rhXSo,  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;ipT0*Y  
 bih.biSizeImage=size; #WlTE&  
 bih.biWidth=btm.bmWidth; WZQ EBXs  
 bih.biXPelsPerMeter=0; 6g-Q  
 bih.biYPelsPerMeter=0; >At* jg48  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @d1YN]ede  
 static int filecount=0; 3Jh!YzI8  
 CString name; l8~s#:v6X  
 name.Format("pict%04d.bmp",filecount++); r?$ V;Z  
 name=m_Path+name; QnTKo&|9  
 BITMAPFILEHEADER bfh; 4Nl3"@<$  
 bfh.bfReserved1=bfh.bfReserved2=0; "sUjJ|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); }Sr=|j  
 bfh.bfSize=54+size; 8n"L4jb(:  
 bfh.bfOffBits=54; ?e#bq]  
 CFile bf; xiy=D5N.=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /_[?i"GW  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /iw$\F |8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 35KRJY#  
  bf.WriteHuge(lpData,size); :lBw0{fP  
  bf.Close(); )C>8B`^S  
  nCount++; #;])/8R%  
 } NyR,@n1  
 GlobalFreePtr(lpData); H{et2J<H  
 if(nCount==1) <  UD90}  
  m_Number.Format("%d picture captured.",nCount); v];P| Fi  
 else j@s*hZ^J+  
  m_Number.Format("%d pictures captured.",nCount); 9U4 D$M  
  UpdateData(FALSE); g%_ 3  
} >K!$@]2F  
`>Ms7G9S~e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -x VZm8y  
{ tNG[|Bi#  
 if(pMsg -> message == WM_KEYDOWN) BIXbdo5F  
 { O<P(UT"  
  if(pMsg -> wParam == VK_ESCAPE) VVw5)O1'  
   return TRUE; EYRg,U&'  
  if(pMsg -> wParam == VK_RETURN) /d*[za'0  
   return TRUE; p5aqlYb6r  
 } $U4[a:  
 return CDialog::PreTranslateMessage(pMsg); Vtv~jJ{m  
} ]YrgkC35  
9T_fq56Oh6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `4-N@h  
{ RpwDOG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eX$RD9 H  
  SaveBmp(); kD me>E=  
  return FALSE; t\WU}aKML  
} ~~3*o  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :(YFIW`59  
 CMenu pop; tTb fyI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); UCo`l~K)qg  
 CMenu*pMenu=pop.GetSubMenu(0); Z]XjN@j"  
 pMenu->SetDefaultItem(ID_EXITICON); ~7w LnB  
 CPoint pt; 8[H bg  
 GetCursorPos(&pt); :;jRAjq"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); i8A-h6E  
 if(id==ID_EXITICON) ;]l`Q,*OXb  
  DeleteIcon(); ,B#*<_?E5  
 else if(id==ID_EXIT) [ D"5@  
  OnCancel(); uhU'm@JZ  
 return FALSE; =9;b|Y"aQ  
} >VppM  `  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +E']&v$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Z^c\M\`7  
 AddIcon(); c-**~tb(  
 return res; >c$3@$  
} ~U4Cf >  
Pa'N)s<  
void CCaptureDlg::AddIcon() |j4p  
{ i3cMRcS;  
 NOTIFYICONDATA data; K!8l!FFl  
 data.cbSize=sizeof(NOTIFYICONDATA); pf&U$oR4  
 CString tip; \c1>15  
 tip.LoadString(IDS_ICONTIP); bPIo9clq  
 data.hIcon=GetIcon(0); 9 ^=kt 2[  
 data.hWnd=GetSafeHwnd(); QJSi|&Rx&?  
 strcpy(data.szTip,tip); @<yYMo7  
 data.uCallbackMessage=IDM_SHELL; .I]EP-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %<|cWYM="z  
 data.uID=98; s_3a#I  
 Shell_NotifyIcon(NIM_ADD,&data); !p Q*m`Xo  
 ShowWindow(SW_HIDE); 9&zQ 5L>  
 bTray=TRUE; KB {IWu  
} Wf~PP;  
VAp 1{  
void CCaptureDlg::DeleteIcon() j_.tg7X  
{ aTkMg  
 NOTIFYICONDATA data; CIVV"p`}  
 data.cbSize=sizeof(NOTIFYICONDATA); oA8A @,-L  
 data.hWnd=GetSafeHwnd(); h!`KX2~  
 data.uID=98; yQ !keGj  
 Shell_NotifyIcon(NIM_DELETE,&data); N|%X/UjZ2.  
 ShowWindow(SW_SHOW); Js(MzL  
 SetForegroundWindow(); 6]mAtA`Y  
 ShowWindow(SW_SHOWNORMAL); d4)0G-|  
 bTray=FALSE; MkWbPm)  
} p*l=rni4  
H`,t"I  
void CCaptureDlg::OnChange() Z4g<Ys*  
{ K1w:JA6(  
 RegisterHotkey(); 0./Rdf=-1j  
} iI;np+uYk  
Rq`5ff3,  
BOOL CCaptureDlg::RegisterHotkey() `Ue5;<K-/  
{ j Y(|z*|  
 UpdateData(); ]MC5 uKn  
 UCHAR mask=0; cUO$IR)yL  
 UCHAR key=0; \}AJ)v*<  
 if(m_bControl) 4?]s%2U6  
  mask|=4; -wVuM.n(Z  
 if(m_bAlt) FH{p1_kZ=  
  mask|=2; {{AZW   
 if(m_bShift) sq@c?!'  
  mask|=1; xZ(d*/6E  
  key=Key_Table[m_Key.GetCurSel()]; a*t>Ks'C  
 if(bRegistered){ LYiIJAZ.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); D~M*]&  
  bRegistered=FALSE; ^>^h|$  
 } 0U !&|i\  
 cMask=mask; -j@IDd7  
 cKey=key; ^])s\a$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \odns  
 return bRegistered; $~\Tl:!#?  
} ' Er\ 68  
wh!8\9{g  
  四、小结 ZZ/k7(8  
cC]]H&'Hg+  
  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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