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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: 1 uKWvp0\  
  #!a}ZhIt  
  一、实现方法 4T]n64Yid  
VeLuL:4I  
  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: 6jdNQC$#B  
=Zg%& J  
#pragma data_seg("shareddata") qB%?t.k7  
HHOOK hHook =NULL; //钩子句柄 1:L _qL  
UINT nHookCount =0; //挂接的程序数目 t%xD epFQ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 h5vvizruy  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jJ(()EJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !R{C  
static int KeyCount =0; @' V=Vr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5]c'n  
#pragma data_seg() q4'Vb  
hcQky/c\#b  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 w=ZSyT-i  
Q db~I#}m'  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: GS!7HphR  
;rD M%S@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Rds_Cd C  
cKey,UCHAR cMask) 8IX:XDEQ  
{ ncF|wz  
 BOOL bAdded=FALSE; ^e<"`e  
 for(int index=0;index<MAX_KEY;index++){ Pz=x$aY  
  if(hCallWnd[index]==0){ U$-;^=;  
   hCallWnd[index]=hWnd; yA74Rxl*6  
   HotKey[index]=cKey; 9GH11B_A  
   HotKeyMask[index]=cMask; u{Z 4M3U  
   bAdded=TRUE; +lK?)77f  
   KeyCount++; G4VdJ(_  
   break; :n@j"-HA  
  } 9KqN .  
 } C(RZ09,.S  
 return bAdded; '+@q  
} gj\'1(Ju  
//删除热键  2s+ITPr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |oYqkP|  
{ `7f><p/q  
 BOOL bRemoved=FALSE; !9w;2Z]uum  
 for(int index=0;index<MAX_KEY;index++){ f&z@J,_=  
  if(hCallWnd[index]==hWnd){ 6}Iu~| 5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .Mn+Bd4f  
    hCallWnd[index]=NULL; eM3-S=R?<g  
    HotKey[index]=0; `|{6U"n  
    HotKeyMask[index]=0; {giKC)!  
    bRemoved=TRUE; 3G4N0{i  
    KeyCount--; -uE2h[X|  
    break; ??4#)n k  
   } LjE@[@d  
  } U\crp T`  
 } aJQx"6 c?  
 return bRemoved; Z#J cN quM  
} ~+JE l%  
XAn{xN pz  
ucVWvXCr  
  DLL中的钩子函数如下: qIO<\Y l  
s,tZi6Z=%E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]bPj%sb*@  
{ 1XwW4cZ>:  
 BOOL bProcessed=FALSE; ]VYv>o`2  
 if(HC_ACTION==nCode) R')D~JJ<8a  
 { O%w"bEr)N  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UG]]Vk1d]  
   switch(wParam) |=dmxfj@  
   {  d]kP@flOV  
    case VK_MENU: -G!W6$Y  
     MaskBits&=~ALTBIT; @[:JQ'R=  
     break; u{H'evv0O  
    case VK_CONTROL: 5|4=uoA<  
     MaskBits&=~CTRLBIT; st b)Tl^  
     break; -{ae  
    case VK_SHIFT: aMUy^>  
     MaskBits&=~SHIFTBIT; 8 |@WuD  
     break; %lr<;   
    default: //judge the key and send message i?*_-NAm  
     break; I6k S1  
   } lbRm(W(  
   for(int index=0;index<MAX_KEY;index++){ GaD]qeS-K  
    if(hCallWnd[index]==NULL) `u./2]n  
     continue; Ca&p;K9FR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #P)7b,3pe  
    { gwf *M3(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Mp8FYPjZ  
     bProcessed=TRUE; @,Re<%\  
    } N@oNg}D&:  
   } 7]i=eD8  
  } X_j=u1*5  
  else if((lParam&0xc000ffff)==1){ //有键按下 3eqVY0q  
   switch(wParam) >N&C-6W  
   { QGWfF,q  
    case VK_MENU: oAMB}a;  
     MaskBits|=ALTBIT; \Mujx3Fmvx  
     break; <@Lw '  
    case VK_CONTROL: Cb{n4xKW6  
     MaskBits|=CTRLBIT; .g|D  
     break; \:ELO[(#|{  
    case VK_SHIFT: 'CrBxaA]s  
     MaskBits|=SHIFTBIT; &$'=SL(Z  
     break; qkM<t?uS  
    default: //judge the key and send message x vi&d1  
     break; bIX'|=  
   } YivWvV  
   for(int index=0;index<MAX_KEY;index++){ Ar+<n 2;[  
    if(hCallWnd[index]==NULL) ]>K02SVT:  
     continue; nA!Xb'y&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ) <lpI';T  
    { E^RPK{zO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :HJ@/ s!J  
     bProcessed=TRUE; xnyp'O8yk  
    } WFOO6 kMz  
   } Kn#3^>D  
  } Esc*+}ck  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1pUIZ$@?`  
   for(int index=0;index<MAX_KEY;index++){ Oy @vh>RY  
    if(hCallWnd[index]==NULL) =<_ei|ME  
     continue; ~7N>tjB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ik92='Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); dIOj]5H3F  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 a ]PS`  
   } Jkc1ih`^  
  } Kg#5 @;  
 } ?pT\Ft V  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  Ji>  
} m &U $V  
o9tvf|+z  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: -rEg(@S %  
t`"]"Re  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `&)khxT/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Rwy<#9R[x  
Dn[iA~  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: \2rCT~x  
lL*k!lNs  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }F*u 9E  
{ '' @upZBJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8a\ Pjk  
 { 8:BPXdiK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 n ..9F$a  
  SaveBmp(); )/'y'd<r  
  return FALSE; e[3 rz%'Q  
 } x*)@:W!  
 …… //其它处理及默认处理 ~(TS>ck@  
} ;K'1dsA  
bd n{Y  
y=L9E?  
  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。 H:~41f[  
Q~5!c#r  
  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。 Cq7EdK;x  
'xO^2m+N;  
  二、编程步骤 Vx]{<}(gr  
94=aVM\>>  
  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"; Z/z(P8#U\  
u>G#{$)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; FyXz(l:  
K22'XrN  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; [6bK>w"v  
|JpLMUG  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; k5>K/;*9  
oSb,)k@  
  5、 添加代码,编译运行程序。 9s5PJj"u  
-3M6[`/  
三、程序代码 '`$US;5  
Min^EAG@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %8?s3^ o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e3+'m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1 :xN)M,s  
#if _MSC_VER > 1000 G<1awi  
#pragma once xDf<@  
#endif // _MSC_VER > 1000 6%mF iX  
#ifndef __AFXWIN_H__ SX$Nef9p  
#error include 'stdafx.h' before including this file for PCH I_Q*uH.Y5  
#endif M PMa  
#include "resource.h" // main symbols e ;4y5i  
class CHookApp : public CWinApp QyJ2P{z  
{ (6C%w)8'  
 public: FFTh}>>  
  CHookApp(); k+^-;=u 6<  
  // Overrides t3TnqA  
  // ClassWizard generated virtual function overrides a0Y/,S*K  
  //{{AFX_VIRTUAL(CHookApp) ! H)D@,@&  
 public: !6t ()]  
  virtual BOOL InitInstance(); N'L3Oa\%  
  virtual int ExitInstance(); K-$gTV  
  //}}AFX_VIRTUAL l \=M'D  
  //{{AFX_MSG(CHookApp) LB<,(dyh  
  // NOTE - the ClassWizard will add and remove member functions here. l vuoVINEp  
  // DO NOT EDIT what you see in these blocks of generated code ! c}nXMA^^  
  //}}AFX_MSG L0_qHLY  
  DECLARE_MESSAGE_MAP() OUY 65K  
}; ( }DCy23  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); :*wnO;eN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jk0Ja@8PK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C0\A  
BOOL InitHotkey(); AiXxn'&i  
BOOL UnInit(); zwAkXj  
#endif _kR,R"lh  
7o$4ov;T  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. l$%mZl  
#include "stdafx.h" r)jj]$0  
#include "hook.h" _rQM[{Bkg  
#include <windowsx.h> 90%alG 1>y  
#ifdef _DEBUG z6tH2Wxf  
#define new DEBUG_NEW U>^u!1X  
#undef THIS_FILE N?d4Pu1m  
static char THIS_FILE[] = __FILE__; s=lkK / [  
#endif $ ]/a/!d  
#define MAX_KEY 100 Z3K~C_0Cnu  
#define CTRLBIT 0x04 lFT_J?G$'  
#define ALTBIT 0x02 +zpmy3Q  
#define SHIFTBIT 0x01 9/LI[{  
#pragma data_seg("shareddata") ,|4%YaN.3  
HHOOK hHook =NULL; 1mw<$'pm0  
UINT nHookCount =0; ~=5vc''  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~F`t[p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT J4 yT|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey v)(tB7&`=  
static int KeyCount =0;  *$nz<?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4_3 DQx9s  
#pragma data_seg() y0Pr[XZ  
HINSTANCE hins; i%7b)t[y  
void VerifyWindow(); gt5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b??k|q  
//{{AFX_MSG_MAP(CHookApp) ;C8'7  
// NOTE - the ClassWizard will add and remove mapping macros here. *)c,~R^  
// DO NOT EDIT what you see in these blocks of generated code! g->cgExj  
//}}AFX_MSG_MAP gt3;Xi  
END_MESSAGE_MAP() >pKu G#  
=N-,.{`  
CHookApp::CHookApp() oWVlHAPj  
{ fu/v1Nhm  
 // TODO: add construction code here, w, u`06  
 // Place all significant initialization in InitInstance [c@14]e  
} v4}kmH1  
4  |$|]E  
CHookApp theApp; gIR{!'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Yt"&8N]  
{ ~%9ofXy  
 BOOL bProcessed=FALSE; #NM .g  
 if(HC_ACTION==nCode) #`6A}/@.+  
 { h<oQ9zW)  
  if((lParam&0xc0000000)==0xc0000000){// Key up o6^^hc\  
   switch(wParam) "M*Pt  
   { 8$!/Zg  
    case VK_MENU: B9;-Blh  
     MaskBits&=~ALTBIT; DiF=<} >x  
     break; `vJ+ sRf  
    case VK_CONTROL: CtwMMZXX3  
     MaskBits&=~CTRLBIT; |[x) %5F  
     break; W! FmC$Kc  
    case VK_SHIFT: }Y(yDg;"  
     MaskBits&=~SHIFTBIT; iYj+NL  
     break; B$b'bw.  
    default: //judge the key and send message 1!. CfQi  
     break; 8Ua ;< h%  
   } Do}mCv  
   for(int index=0;index<MAX_KEY;index++){ S5ofe]tS@  
    if(hCallWnd[index]==NULL) T!o 4k  
     continue; 4*9y4"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5B{O!SNd  
    { G0Wzx)3]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _p vL b  
     bProcessed=TRUE; _s./^B_w!  
    } j;fmmV@  
   } K,YKU? z6  
  } F"9f6<ge  
  else if((lParam&0xc000ffff)==1){ //Key down )J+vmY~&  
   switch(wParam) 7 \aLK#  
   { 9viQ<}K<  
    case VK_MENU: r=dFk?8XbC  
     MaskBits|=ALTBIT; S86%o,Saq\  
     break; '\dau>  
    case VK_CONTROL: V)\|I8"  
     MaskBits|=CTRLBIT; 7>EjP&l  
     break; k*\=IacX0  
    case VK_SHIFT: E)%]?/w  
     MaskBits|=SHIFTBIT; GeN8_i[  
     break; o >{+vwK  
    default: //judge the key and send message 95giqQ(N  
     break; -\@&^e  
   } t#mW`rGE_  
   for(int index=0;index<MAX_KEY;index++) hqVx%4s*J  
   { &#Sg1$/+  
    if(hCallWnd[index]==NULL) .L%_#A  
     continue; ni gp83:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6.|f iQs ]  
    { vyT$IdV2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CqDMq!  
     bProcessed=TRUE; HPs$R [  
    } 5:SfPAx  
   } w}pFa76rm  
  } @)iv'   
  if(!bProcessed){ P-ma~g>I  
   for(int index=0;index<MAX_KEY;index++){ :NHh`@0F  
    if(hCallWnd[index]==NULL) '3eP<earRP  
     continue; MId\ dFu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u2'xM0nQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >4=sEj  
   } < 2w@5qL  
  } BvpGP  
 } ymybj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !8ub3oj)  
} =!r9;L,?  
$@q)IK%FDL  
BOOL InitHotkey() +\9Y;N y  
{ 5B| iBS l  
 if(hHook!=NULL){ uYiM~^ 0  
  nHookCount++; Mq]~Ka3q7  
  return TRUE; z7F~;IB*u  
 } iUqL /  
 else >:5/V0;,  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !<}<HR^ )  
  if(hHook!=NULL) S|Wv1H>  
   nHookCount++; j2 "j Cv  
  return (hHook!=NULL); nm 66U4.@  
} }NDw3{zn  
BOOL UnInit() J\XYUs  
{ )DuOo83n["  
 if(nHookCount>1){ ws4a(1  
  nHookCount--; 5#+!|S[PK  
  return TRUE; t#oJr2  
 } zzy%dc  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %WHue  
 if(unhooked==TRUE){ R@t?!`f!+  
  nHookCount=0; (Ac ' }O  
  hHook=NULL; Z2`(UbG}  
 } o <8L, u(U  
 return unhooked; $zq`hI!1  
} 9)s=%dL  
MsCY5g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IX;u+B  
{ d_Ll,*J9  
 BOOL bAdded=FALSE; 30g-J(Zg  
 for(int index=0;index<MAX_KEY;index++){ )Z0pU\  
  if(hCallWnd[index]==0){ <oTIzj7f  
   hCallWnd[index]=hWnd; `TKe+oS)  
   HotKey[index]=cKey; a /X@5kr{  
   HotKeyMask[index]=cMask; "#d}S)GlXM  
   bAdded=TRUE; ^,'!j/w5  
   KeyCount++; L~SM#?z:ue  
   break; HS]|s':  
  } "zR+}  
 } f$9V_j-K+  
 return bAdded; ?%(8RQ  
} Q/r9r*>z  
bl(rCbj(w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V[Fzh\2n  
{ Xm*gH, '  
 BOOL bRemoved=FALSE; z#GZvB/z)  
 for(int index=0;index<MAX_KEY;index++){ 3,e^; {w  
  if(hCallWnd[index]==hWnd){ Hn0 ,LH$/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ y^=\w?d  
    hCallWnd[index]=NULL; WMZ&LlB%  
    HotKey[index]=0; BdB/`X*  
    HotKeyMask[index]=0; zn&NLsA  
    bRemoved=TRUE; qYZX, x  
    KeyCount--; BftW<1,U^  
    break; 0Jz'9  
   } ` *x;&.&v  
  } I/rq@27o  
 } * Ibl+  
 return bRemoved; X a#`VDh  
} g:`V:kbY$  
Wcl@ H @  
void VerifyWindow() 8-UlbO6  
{ PYPs64kNC]  
 for(int i=0;i<MAX_KEY;i++){ !]7Z),s  
  if(hCallWnd!=NULL){ i]a0 "  
   if(!IsWindow(hCallWnd)){ kJq8"Klg  
    hCallWnd=NULL; L;H(I@p(e  
    HotKey=0; 7NV1w*> /  
    HotKeyMask=0; L|EvI.f  
    KeyCount--; 4!,x3H'  
   } O8"kIDr-  
  } y|Tb&XPD  
 } :w:hqe|_  
} w4<1*u@${  
j8WnXp_  
BOOL CHookApp::InitInstance() u.x>::i&  
{ Co&#mVY4,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qd(C%Wk  
 hins=AfxGetInstanceHandle(); oOUL<ihe?  
 InitHotkey(); ,1EyT>  
 return CWinApp::InitInstance(); u;H SX  
} Eb{Zm<TP  
i[sHPEml(5  
int CHookApp::ExitInstance() xCz(qR  
{ _@;t^j+l  
 VerifyWindow(); K[PH#dF5,x  
 UnInit(); UUc{1"z{  
 return CWinApp::ExitInstance(); R$k4}p  
} _Je<_pl!D  
BSYJ2   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wZ6LiYiHl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |jH- bm  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kL\ FY  
#if _MSC_VER > 1000 cm@q{(r  
#pragma once O@6iG  
#endif // _MSC_VER > 1000 Pp3<K649  
*cz nokq6  
class CCaptureDlg : public CDialog <V0]~3  
{ '`&gSL.1a@  
 // Construction nh"nSBRxk  
 public: UUJbF$@;  
  BOOL bTray; oP;"`^_  
  BOOL bRegistered; 109dB$+$  
  BOOL RegisterHotkey(); -b"mx"'?  
  UCHAR cKey; 5RXZ$/  
  UCHAR cMask; fT.18{'>  
  void DeleteIcon(); pyYm<dn  
  void AddIcon(); ^0p y  
  UINT nCount; N}Q%y(O^  
  void SaveBmp(); 0Am&:kX't  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor uP2e/a  
  // Dialog Data dU<\ FW_  
  //{{AFX_DATA(CCaptureDlg) 8Q ba4kgL  
  enum { IDD = IDD_CAPTURE_DIALOG }; }vzP\  
  CComboBox m_Key; _b|mSo,{Y  
  BOOL m_bControl; j>Wb$p6S  
  BOOL m_bAlt; c u*8,*FU  
  BOOL m_bShift; 6RV42r^pf  
  CString m_Path; IA I!a1e!  
  CString m_Number; ~ (bY-6z  
  //}}AFX_DATA S^(OjS  
  // ClassWizard generated virtual function overrides w#mnab@  
  //{{AFX_VIRTUAL(CCaptureDlg) $X<O\Kna  
 public: l*~O;do  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?!TFoD2'  
 protected: {~q"Y]?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `u6CuH5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MIma:N_c  
  //}}AFX_VIRTUAL UtPFkase  
  // Implementation |2t g3m@  
 protected: ,yc_r= _  
  HICON m_hIcon; eA q/[(  
  // Generated message map functions xe?!UCUb@  
  //{{AFX_MSG(CCaptureDlg) VF[$hs  
  virtual BOOL OnInitDialog(); -([ ipg(r  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~ +DPq|-O  
  afx_msg void OnPaint(); j"=F\S&!  
  afx_msg HCURSOR OnQueryDragIcon(); mbT4K8<^  
  virtual void OnCancel(); vDI$ QUMD6  
  afx_msg void OnAbout(); t 7GK\B8:  
  afx_msg void OnBrowse(); 1%Hc/N-  
  afx_msg void OnChange(); jHjap:i`cI  
 //}}AFX_MSG Nl/^ga  
 DECLARE_MESSAGE_MAP() @cYb37)q=  
}; W D8  
#endif j=|cx+nb  
NzS(, F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pGZiADT  
#include "stdafx.h" kIl!n  
#include "Capture.h" >_XC  
#include "CaptureDlg.h" F(h jP  
#include <windowsx.h> (U@Ks )  
#pragma comment(lib,"hook.lib") _EPfeh;  
#ifdef _DEBUG ;::]R'F[  
#define new DEBUG_NEW |m{u]9  
#undef THIS_FILE zm>^!j !  
static char THIS_FILE[] = __FILE__; rfo7\'yk  
#endif m&S *S_c  
#define IDM_SHELL WM_USER+1 suKr//_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $?P5A E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ZZ'5BfI"I%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lo!^h]iE!  
class CAboutDlg : public CDialog +G: CR,Z>+  
{ :/A7Z<u,  
 public: Ymvd3>_  
  CAboutDlg(); a+mrsyM  
  // Dialog Data w?#s)z4}g  
  //{{AFX_DATA(CAboutDlg) Cb}I-GtO  
  enum { IDD = IDD_ABOUTBOX }; ehTrjb3k  
  //}}AFX_DATA c'|](vOd]  
  // ClassWizard generated virtual function overrides r=}v` R&  
  //{{AFX_VIRTUAL(CAboutDlg) sdp3geBYo  
 protected: #jj+/>ZOi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `;j@v8n$*  
  //}}AFX_VIRTUAL HQkK8'\LP  
  // Implementation nh XVc((  
 protected: 7q%xF#mK=  
  //{{AFX_MSG(CAboutDlg) ^sVr#T  
  //}}AFX_MSG 52,[dP,g  
  DECLARE_MESSAGE_MAP() Am ~P$dN  
}; B,S~Idr}  
bZ 0{wpeK=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C))x#P36  
{ Q{[l1:  
 //{{AFX_DATA_INIT(CAboutDlg) 6 2:FlW>  
 //}}AFX_DATA_INIT !jWE^@P/B  
} s$gR;su)g  
Xb<>AzEM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7Is:hx|:  
{ ]9 $iUA%Ef  
 CDialog::DoDataExchange(pDX); a^o'KN{  
 //{{AFX_DATA_MAP(CAboutDlg) -I ?8\  
 //}}AFX_DATA_MAP )FpizoVq0  
} a%nf )-}|  
dtj+ av G  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {8* d{0l  
 //{{AFX_MSG_MAP(CAboutDlg) x^zw1e,y  
 // No message handlers ;\g0* b(  
 //}}AFX_MSG_MAP "5HSCl$r%  
END_MESSAGE_MAP() oRZ98?Y\B  
"wy2u~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) j:2TicHDC  
: CDialog(CCaptureDlg::IDD, pParent) s_;o1 K0  
{ k{F]^VXQ  
 //{{AFX_DATA_INIT(CCaptureDlg) B#DnU;=O#+  
  m_bControl = FALSE; (kTu6t*  
  m_bAlt = FALSE; \ )WS^KR%  
  m_bShift = FALSE; $35C1"  
  m_Path = _T("c:\\"); )b?$ 4<X^  
  m_Number = _T("0 picture captured."); uv=a}U;  
  nCount=0; \Up~ "q>Kb  
  bRegistered=FALSE; b4qMTRnv  
  bTray=FALSE; YP Qix  
 //}}AFX_DATA_INIT mBeP" GS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 eDsB.^|l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B[3u,<opFU  
} q|{z9V<  
,!40\"A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z;<:=#  
{ KKq%'y)u^  
 CDialog::DoDataExchange(pDX); *Z$W"JP  
 //{{AFX_DATA_MAP(CCaptureDlg) yJ/YK  
  DDX_Control(pDX, IDC_KEY, m_Key); |}?H$d  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  + \]-"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sW-0G$,|  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <Umr2Vw-  
  DDX_Text(pDX, IDC_PATH, m_Path); K491QXG  
  DDX_Text(pDX, IDC_NUMBER, m_Number); XV}}A ^  
 //}}AFX_DATA_MAP 5sANF9o!  
} %:s+5*SKe  
*_Vv(H&  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C*}PL  
//{{AFX_MSG_MAP(CCaptureDlg) W#+f2 RR  
 ON_WM_SYSCOMMAND() -2[#1S*  
 ON_WM_PAINT() eEBo:Rc9  
 ON_WM_QUERYDRAGICON() ~N%+ZXh&E  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) r+d+gO.  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mW$Oi++'d  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :R`e<g~4  
//}}AFX_MSG_MAP 5 JlgnxRq  
END_MESSAGE_MAP() m lxtey6H3  
Y&1N*@YP  
BOOL CCaptureDlg::OnInitDialog() 3G[|4v?[<_  
{ $q*a}d[Q  
 CDialog::OnInitDialog(); 80=LT-%#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t`="2$NO  
 ASSERT(IDM_ABOUTBOX < 0xF000); "IB36/9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); LZb<-vK"y  
 if (pSysMenu != NULL) 3%+!qm  
 { X}xf_3N "  
  CString strAboutMenu; Wco2i m  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @t a:9wZ  
  if (!strAboutMenu.IsEmpty()) sv!zY= 6  
  { ; Xf1BG r  
   pSysMenu->AppendMenu(MF_SEPARATOR); c`/VYgcTqB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); soLW'8  
  } q9dplEe5  
 } {i+ o'Lw  
 SetIcon(m_hIcon, TRUE); // Set big icon lu00@~rx/  
 SetIcon(m_hIcon, FALSE); // Set small icon 8k3y"239t  
 m_Key.SetCurSel(0); 5S8>y7knQ  
 RegisterHotkey();  H~TuQ  
 CMenu* pMenu=GetSystemMenu(FALSE); L2p?] :-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 064k;|>D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); oNIYO*[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Yj'9|4%+|  
 return TRUE; // return TRUE unless you set the focus to a control I-}ms  
} U3C"o|   
QJj='+R>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) G pI4QzR  
{ cxQAp  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B~^*@5#0|  
 { h (q,T$7 W  
  CAboutDlg dlgAbout; +SF+$^T  
  dlgAbout.DoModal(); '#yqw%  
 } >DUTmJxv  
 else n 7i5A:  
 { 0TaI"/ai  
  CDialog::OnSysCommand(nID, lParam); ;<q 2  
 } ! d<R =L  
} =%<, ^2o  
eM{u>n+`F0  
void CCaptureDlg::OnPaint() ?QmtZG.$  
{ HHZw-/ s,%  
 if (IsIconic()) xVw@pR;  
 { ]\KVA)\  
  CPaintDC dc(this); // device context for painting ^8EW/$k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xxyc^\$  
  // Center icon in client rectangle _?:jZ1wZ  
  int cxIcon = GetSystemMetrics(SM_CXICON); Arg/ge.y  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5q*s_acQ  
  CRect rect; E a&NJ]& g  
  GetClientRect(&rect); JRi:MWR<r  
  int x = (rect.Width() - cxIcon + 1) / 2; Pc*lHoVL  
  int y = (rect.Height() - cyIcon + 1) / 2; S't9F  
  // Draw the icon .hu7JM+  
  dc.DrawIcon(x, y, m_hIcon); ?$K-f:?c  
 } V]; i$  
 else }2@Z{5sh)  
 { o5p{ O>D[z  
  CDialog::OnPaint(); O-HS)g$2  
 } <!g]q1  
} _qR?5;v  
YTFU# F  
HCURSOR CCaptureDlg::OnQueryDragIcon() Y ~g\peG7  
{ jan}}7Dly  
 return (HCURSOR) m_hIcon; 41Z@_J|&  
} *ma w`1  
5\# F5s}  
void CCaptureDlg::OnCancel() %SOXw 8-  
{ r@}`Sw]@  
 if(bTray) b6 %m*~  
  DeleteIcon();  NdRcA  
  CDialog::OnCancel(); _,!0_\+i  
} e2v`  
uUg;v/:  
void CCaptureDlg::OnAbout() 8 7(t<3V&  
{ { 7jim  
 CAboutDlg dlg; k7Bh[ ..!  
 dlg.DoModal(); {/]2~!  
}  I8?  
`jGeS[FhR  
void CCaptureDlg::OnBrowse() k}v`UiGM  
{ fr/EkL1Dl  
 CString str; ;:D-}t;  
 BROWSEINFO bi; Q"dq_8\`U  
 char name[MAX_PATH]; &Gjpc>d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /IWA U)A0  
 bi.hwndOwner=GetSafeHwnd(); PP$sdmo  
 bi.pszDisplayName=name; 04-_ K  
 bi.lpszTitle="Select folder"; Ob/)f)!!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;&&<zWq3h  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4>=M"D hB  
 if(idl==NULL) D+3?p  
  return; 7A\`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9>&zOITTaL  
 str.ReleaseBuffer(); t|iN Sy3  
 m_Path=str; G`zNCx.  
 if(str.GetAt(str.GetLength()-1)!='\\') qUd7O](b=?  
  m_Path+="\\"; Uw("+[5O0  
 UpdateData(FALSE); FB[b]+t`D{  
} @}H u)HO  
_li3cXE  
void CCaptureDlg::SaveBmp() %3a-@!|1<  
{ i]r(VKX  
 CDC dc; Ei_ ~ K';  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); P`lv_oV  
 CBitmap bm; f\hMTebma$  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7<xnE]jdq  
 int Height=GetSystemMetrics(SM_CYSCREEN);  pX_#Y)5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 'Tm1Mh0Fso  
 CDC tdc; ~A=zjkm  
 tdc.CreateCompatibleDC(&dc); P~trxp=k  
 CBitmap*pOld=tdc.SelectObject(&bm); 9~Dg<wQ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !"F;wg$  
 tdc.SelectObject(pOld); @PvO;]]%  
 BITMAP btm; "Au4&Fu  
 bm.GetBitmap(&btm); Y6v{eWtSn  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 2%pED xui  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P$obID  
 BITMAPINFOHEADER bih; mU #F>  
 bih.biBitCount=btm.bmBitsPixel; n4k q=Z%  
 bih.biClrImportant=0; m8fj\,X  
 bih.biClrUsed=0; ^Gk`n  
 bih.biCompression=0; h-P|O6@Ki  
 bih.biHeight=btm.bmHeight; 5.6tVr  
 bih.biPlanes=1; Y*c]C;%=  
 bih.biSize=sizeof(BITMAPINFOHEADER); -$Z1X_~;)<  
 bih.biSizeImage=size; P1mg;!tq  
 bih.biWidth=btm.bmWidth; >_?i)%+)  
 bih.biXPelsPerMeter=0; W"Ip]LJ  
 bih.biYPelsPerMeter=0; |q w0:c=7!  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~*iF`T6  
 static int filecount=0; GY]P(NU  
 CString name; N1~bp?$1  
 name.Format("pict%04d.bmp",filecount++); kZw"a*6  
 name=m_Path+name; 7_\sx7h{3  
 BITMAPFILEHEADER bfh; ;R*-cm  
 bfh.bfReserved1=bfh.bfReserved2=0; 9[.HWe,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); aRMlE*yW  
 bfh.bfSize=54+size; ^+m`mcsE  
 bfh.bfOffBits=54; *?X&Y8Kf  
 CFile bf; /L^g. ~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *E/Bfp1LIe  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); K}l3t2uk  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  ~71U s  
  bf.WriteHuge(lpData,size); 7H3v[ f^Q  
  bf.Close(); 8 Rj5~+5  
  nCount++; WN'AQ~qA  
 } c[Fc3  
 GlobalFreePtr(lpData); H+[?{+"#@l  
 if(nCount==1) MRLiiIrq,5  
  m_Number.Format("%d picture captured.",nCount); A%8 Q}s$<s  
 else +dCDk* /m  
  m_Number.Format("%d pictures captured.",nCount); JH.XZM&  
  UpdateData(FALSE); h[remR# 3\  
} 0nwi5  
1bV G%N  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X/4CXtX^  
{ X?_rD'3  
 if(pMsg -> message == WM_KEYDOWN) WzzA:X  
 {  ew1L+  
  if(pMsg -> wParam == VK_ESCAPE) e/D{^*~S  
   return TRUE; <,~OcJG(   
  if(pMsg -> wParam == VK_RETURN) SP%X@~d  
   return TRUE; #*.!J zOg  
 } i-CJ{l  
 return CDialog::PreTranslateMessage(pMsg);  V(&L  
} *u$aItx  
*Dp&;,b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %p}vX9U')  
{ )O[8 D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?IGp?R^j"  
  SaveBmp(); x@  =p  
  return FALSE; >fC&bab  
} lD0p=`.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NN4Z:6W5  
 CMenu pop; [piK"N  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !4p{ b f  
 CMenu*pMenu=pop.GetSubMenu(0); Kki(A 4;7F  
 pMenu->SetDefaultItem(ID_EXITICON); JT 7WZc)  
 CPoint pt; j e\!0{  
 GetCursorPos(&pt); pf8'xdExH)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8>C4w 5kF  
 if(id==ID_EXITICON) H9T~7e+  
  DeleteIcon(); _A,_RM$Y  
 else if(id==ID_EXIT) Mk*4J]PP  
  OnCancel(); 1GN^ui a7  
 return FALSE; 5HbHJ.|r  
} &y_t,8>5  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?\\wLZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8-G )lyfj  
 AddIcon(); Q6(~VvC-  
 return res; Y(,RJ&7  
} M ygCg(h  
Gpu[<Z4  
void CCaptureDlg::AddIcon() =i)%AnZ^9  
{ \92M\S  
 NOTIFYICONDATA data; q{9vY:`[  
 data.cbSize=sizeof(NOTIFYICONDATA); NO*, }aeG  
 CString tip; :a*>PMTn  
 tip.LoadString(IDS_ICONTIP); vC,FE )'  
 data.hIcon=GetIcon(0);  9tpyrGv  
 data.hWnd=GetSafeHwnd(); )>ff"| X  
 strcpy(data.szTip,tip); ?i<l7   
 data.uCallbackMessage=IDM_SHELL; }%XB*pzQ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; od!44p]  
 data.uID=98; ranem0KQ)]  
 Shell_NotifyIcon(NIM_ADD,&data); phDIUhL$z  
 ShowWindow(SW_HIDE); 1L <TzQ  
 bTray=TRUE; U 4d7-&U  
} _f!ko<52  
I[%IW4jJ  
void CCaptureDlg::DeleteIcon() 0L>3 i8'  
{ D*.3]3-I  
 NOTIFYICONDATA data; le5@WG/x  
 data.cbSize=sizeof(NOTIFYICONDATA); URVW5c  
 data.hWnd=GetSafeHwnd(); ^$oa`B^2JM  
 data.uID=98; ]{tWfv|Xg8  
 Shell_NotifyIcon(NIM_DELETE,&data); :Ou~?q%X  
 ShowWindow(SW_SHOW); 6@|!m'  
 SetForegroundWindow(); qBk[Afjgz  
 ShowWindow(SW_SHOWNORMAL); l i<9nMZ<  
 bTray=FALSE; 0@_8JB ?E  
} $l ,U)  
GIlaJ!/  
void CCaptureDlg::OnChange() z"6o|]9I  
{ z_(l]Ern}  
 RegisterHotkey(); #Shy^58$  
} 7Ydqg&  
N)(m^M(~0  
BOOL CCaptureDlg::RegisterHotkey() p7+{xXf  
{ 1 k!gR  
 UpdateData(); "pt[Nm76)8  
 UCHAR mask=0; ,q*|R O  
 UCHAR key=0; "0!#De  
 if(m_bControl) 6ud?US(  
  mask|=4; D?ic~-&  
 if(m_bAlt) z\v  
  mask|=2; xDe^>(,"  
 if(m_bShift) rE*yT(:w  
  mask|=1; `_yksh3zL4  
  key=Key_Table[m_Key.GetCurSel()]; og$dv 23  
 if(bRegistered){ igOX0  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); _U*R_2aV  
  bRegistered=FALSE; O4-#)#-)S~  
 } xpa+R^D5G  
 cMask=mask; tic3a1  
 cKey=key; jGLmgJG-P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Rq1 5AR  
 return bRegistered; ^Ip\`2^u  
} uEPm[oyX  
L e~D"d8  
  四、小结 o<b  
djf8FNnn  
  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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