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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: I_N"mnn@Nr  
  G!%1<SLi.  
  一、实现方法 I'J=I{p*  
/I: d<A  
  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: u\>Ed9^  
^${-^w@,%V  
#pragma data_seg("shareddata") 011 _(v  
HHOOK hHook =NULL; //钩子句柄 ptrLnJ|%  
UINT nHookCount =0; //挂接的程序数目 <y~`J`-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Lt=#tu&d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 AvhmN5O =  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey {Uu7@1@n  
static int KeyCount =0; tpA7"JD  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 u5%.T0 P  
#pragma data_seg() l6)*u[}E   
i1u & -#k  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 d(R3![:  
{s 4:V=J  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: [|uAfp5R  
<L:v28c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6`F_js.a  
cKey,UCHAR cMask) {8b6A~/  
{ +-HaYB|p  
 BOOL bAdded=FALSE; `N2zeFG  
 for(int index=0;index<MAX_KEY;index++){ 5Ss=z  
  if(hCallWnd[index]==0){ .wYx_  
   hCallWnd[index]=hWnd; %z1WdiC  
   HotKey[index]=cKey; IOt!A  
   HotKeyMask[index]=cMask; RM QlciG  
   bAdded=TRUE; [bE9Y;  
   KeyCount++; -s4qm)\  
   break; zn@tLLX  
  } R (4 :_ xc  
 } {Pu\KRU  
 return bAdded; _?`3zm4  
} (;cbgHo%}  
//删除热键 %vn rLt$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fE7[Sk  
{ GT2;o  
 BOOL bRemoved=FALSE; ;V`~'357%  
 for(int index=0;index<MAX_KEY;index++){ C %y AMQ  
  if(hCallWnd[index]==hWnd){ N CX!ss  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6-<,1Q'D  
    hCallWnd[index]=NULL; Gz$DsaG  
    HotKey[index]=0; ;nSaZ$`5  
    HotKeyMask[index]=0; T3!l{vG \O  
    bRemoved=TRUE; "l2_7ZXsPT  
    KeyCount--; x@(91f  
    break; @ttcFX1:W  
   } 5-aCNAF2  
  } Q!|. ,?V  
 } rOH8W  
 return bRemoved; I)9;4lix  
} +g\u=&< 6  
a+,)rY9  
6BNOF66kH  
  DLL中的钩子函数如下: ~ia#=|1}  
a)[tkjU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0;r+E*`DA  
{ - C8 h$P  
 BOOL bProcessed=FALSE; (F~eknJ  
 if(HC_ACTION==nCode) T?NwSxGo  
 { q'd6\G0 }  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "k5 C?~  
   switch(wParam) ?OlYJ/!z3  
   {  ]D%D:>9|/  
    case VK_MENU: <-X)<k  
     MaskBits&=~ALTBIT; ($[pCdY  
     break; GS\-  
    case VK_CONTROL: 0t6s20*q  
     MaskBits&=~CTRLBIT; Kx$?IxZ  
     break; (m~MyT#S  
    case VK_SHIFT: +X"TiA7{j  
     MaskBits&=~SHIFTBIT; 6e/2X<O  
     break; 4s.wQ2m  
    default: //judge the key and send message X-6Se  
     break; =-`X61];M  
   } `N ;!=7y7Y  
   for(int index=0;index<MAX_KEY;index++){ p*n$iroy_{  
    if(hCallWnd[index]==NULL) ,$7LMTVDrE  
     continue; e2k!5O S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _sJp"4?  
    { 3-~_F*%ST  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]:Ocu--  
     bProcessed=TRUE; J1P82=$,  
    } {Km|SG[-q  
   } XR]]g+Z  
  } .lTU[(qwu  
  else if((lParam&0xc000ffff)==1){ //有键按下 +TA(crD  
   switch(wParam) q1`uS^3`  
   { 7H++ pOF  
    case VK_MENU: Q->'e-\E<"  
     MaskBits|=ALTBIT; ~\Fde^1  
     break; &I<R|a  
    case VK_CONTROL: 2mVH*\D  
     MaskBits|=CTRLBIT; o7&Z4(V  
     break; !5Z?D8dcx  
    case VK_SHIFT: J6rXb ui$  
     MaskBits|=SHIFTBIT; :G,GHU'/78  
     break; rOS fDv  
    default: //judge the key and send message zxTm`Dh;[  
     break; xL=g(FN(6L  
   } U~!97,|ic  
   for(int index=0;index<MAX_KEY;index++){ fh:=ja?bM3  
    if(hCallWnd[index]==NULL) X NnsMl  
     continue; **dGK_^T0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mWta B>f  
    { hFs0qPVY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u,4,s[  
     bProcessed=TRUE; ,TeDJ\k  
    } ^ D?;K8a-l  
   } _Ev"/ %  
  } X*}S(9cg\i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &h8+ -  
   for(int index=0;index<MAX_KEY;index++){ M'R^?Jjb  
    if(hCallWnd[index]==NULL) cD-\fRBGK  
     continue; 5H""_uw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C7eaioW$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0 l G\QT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^k t#[N  
   } DZ(e^vq  
  } X}h{xl   
 } c|hKo[r)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Xj?j1R>GB  
} ezC55nm  
E!C~*l]wJx  
  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: jFbz:aUF  
Eki7bT@/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @_h/%>0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nYTI\f/8v  
6pxj9@X+  
  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: S!up2OseW  
`"Tx%>E(U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3,S5>~R=  
{ O BF5Tl4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \[ +ZKj:  
 { #oJ9BgDry  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 akrEZ7A  
  SaveBmp(); N;;!ObVHnP  
  return FALSE; Z!^iPB0~D  
 } d+[hB4!l2  
 …… //其它处理及默认处理 YmNBtGhT  
} WVf;uob{  
@;JT }R H-  
3 3s.p'  
  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。 5 S7\m5  
P=(\3ok  
  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。 adHHnH`,  
_+.z2} M  
  二、编程步骤 b?h"a<7  
r6*0H/*  
  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"; i,$*+2Z  
D{PO!WzW  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u`R  
_lu.@IX-  
  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; GriL< =?t  
CIYTs,u#  
  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; kplyZ  
y =G  
  5、 添加代码,编译运行程序。 |!flR? OU  
wNcf7/ky  
三、程序代码 11%^K=dq  
)xT_RBR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |A[Le ;,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -8#Of)W  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;UArDwH  
#if _MSC_VER > 1000 OAc+LdT  
#pragma once r }pYm'e  
#endif // _MSC_VER > 1000 pc:~_6S  
#ifndef __AFXWIN_H__ 0waQw7 E  
#error include 'stdafx.h' before including this file for PCH [1G4he%  
#endif DLJu%5F  
#include "resource.h" // main symbols Y[ a$~n^:n  
class CHookApp : public CWinApp Vdh5s292h  
{ &NB[:S =  
 public: Ag#p )  
  CHookApp(); W5HC7o\4  
  // Overrides <G}>Gk8x  
  // ClassWizard generated virtual function overrides '!b1~+PV  
  //{{AFX_VIRTUAL(CHookApp) Nq9@^ E-{M  
 public: =uMoX -  
  virtual BOOL InitInstance(); L&.9.Ll  
  virtual int ExitInstance(); E{(7]Wri  
  //}}AFX_VIRTUAL pN1W|Wv2  
  //{{AFX_MSG(CHookApp) xzAyE5GL>  
  // NOTE - the ClassWizard will add and remove member functions here. `:R8~>p  
  // DO NOT EDIT what you see in these blocks of generated code !  gX.4I;  
  //}}AFX_MSG }Q/xBC)  
  DECLARE_MESSAGE_MAP() JY4 +MApN  
}; QEm6#y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Z_ak4C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #e{l:!uS\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bCy.S.`jHQ  
BOOL InitHotkey(); F3;UH%L1  
BOOL UnInit(); : v<|y F  
#endif 3{]csZvW  
cRI&cN"o  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !n@Yg2w  
#include "stdafx.h" Ro$l/lXl8t  
#include "hook.h" f*aYS  
#include <windowsx.h> b: +.Y$%F-  
#ifdef _DEBUG j^Bo0{{  
#define new DEBUG_NEW ?2aglj*"v,  
#undef THIS_FILE ||0mfb  
static char THIS_FILE[] = __FILE__; SB:-zQ5  
#endif kOs_]  
#define MAX_KEY 100 M(jSv  
#define CTRLBIT 0x04 [qI, $ +  
#define ALTBIT 0x02 !QSL8v@c  
#define SHIFTBIT 0x01 Jx.Jx~  
#pragma data_seg("shareddata") Y'DI@  
HHOOK hHook =NULL; ?2E@)7  
UINT nHookCount =0; N0vr>e`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey K*d+pImrV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \L<Hy)l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Pz:,q~  
static int KeyCount =0; LW{7|g  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 9V9K3xWn  
#pragma data_seg() Kn?>XXAc  
HINSTANCE hins; oDrfzm|[Y  
void VerifyWindow(); !w(J]<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;mjk`6p  
//{{AFX_MSG_MAP(CHookApp) [K9l>O  
// NOTE - the ClassWizard will add and remove mapping macros here. LeF Z%y)F  
// DO NOT EDIT what you see in these blocks of generated code! Z[[q W f  
//}}AFX_MSG_MAP )4bBR@QM  
END_MESSAGE_MAP() jL<:N 8  
"fU=W|lY  
CHookApp::CHookApp() B#OnooJI  
{ &l/2[>D%4  
 // TODO: add construction code here, &&nvv&a  
 // Place all significant initialization in InitInstance hV)D,oN3  
} }N&}6U  
SRRqIQz  
CHookApp theApp; !NuiVC]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LkK%DY  
{ Tuo`>ZA  
 BOOL bProcessed=FALSE; I~-W4{  
 if(HC_ACTION==nCode) @ 4#q  
 { 0r*E$|zZ  
  if((lParam&0xc0000000)==0xc0000000){// Key up onI%Jl sq  
   switch(wParam) iV58 m  
   { ^KM' O8  
    case VK_MENU: wDVKp['  
     MaskBits&=~ALTBIT; &CpxD."8x  
     break; G%jgr"]\z  
    case VK_CONTROL: 'JU(2mF  
     MaskBits&=~CTRLBIT; nm`[\3R  
     break; M ~z A  
    case VK_SHIFT: !ow:P8K?  
     MaskBits&=~SHIFTBIT; 07P/A^Mkx  
     break; {E@Fk,  
    default: //judge the key and send message %M]%[4eC  
     break; ="Zr.g~8  
   } gFizw:l  
   for(int index=0;index<MAX_KEY;index++){ GL-v</2'U  
    if(hCallWnd[index]==NULL) :PE{2*  
     continue; Qz=F nR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WYSqnmi  
    { opU=49 b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @.0>gmY;:  
     bProcessed=TRUE;  Fku~'30  
    } Z-z^0QO  
   } N?hQ53#3  
  } *?x$q/a  
  else if((lParam&0xc000ffff)==1){ //Key down zl^ %x1G  
   switch(wParam) &kUEnwQ -  
   { `<2k.aW4e8  
    case VK_MENU: Q3[MzIk 4  
     MaskBits|=ALTBIT; =(2y$,6g?  
     break; I$7|?8  
    case VK_CONTROL: b"Hc==`  
     MaskBits|=CTRLBIT; \@&oK2f  
     break; "\cDSiD  
    case VK_SHIFT: JZI)jIh  
     MaskBits|=SHIFTBIT; 2[ = =  
     break;  DA]<30 w  
    default: //judge the key and send message (VV5SvdE  
     break; 6 <XQ'tM]N  
   } N-Fs-uB  
   for(int index=0;index<MAX_KEY;index++) h;cl+c|B  
   { -FpZZ8=,M2  
    if(hCallWnd[index]==NULL) -@L7! ,j  
     continue; tg-U x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IJa6W`}  
    { 17P5Dr&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q)te/J@  
     bProcessed=TRUE; E)sC:oO  
    } J=7.-R|t  
   } u_H=Xm)9  
  } Z*/{^ zsE  
  if(!bProcessed){ -Pt.  
   for(int index=0;index<MAX_KEY;index++){ \]<e Lw- v  
    if(hCallWnd[index]==NULL) *U>"_h T0  
     continue; qW+'#Jh@TV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %hDx UZ#0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nilis-Bk_  
   } I]Ev6>=;  
  } Q\Wh]=}  
 } mxD]`F  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K|L&mL&8  
} =r|e]4  
idsBw!DB  
BOOL InitHotkey() !ZNirvk  
{ J([Y4Em5  
 if(hHook!=NULL){ Y*VF1M,2_  
  nHookCount++; :m.6a4vx  
  return TRUE; )R6h 1  
 } =z >d GIT1  
 else +FomAs1*f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jkAWRpOc)  
  if(hHook!=NULL) ]31>0yj[Q  
   nHookCount++; 4 .Kl/b;  
  return (hHook!=NULL); 9*~bAgkWI  
} I]GGmN  
BOOL UnInit() !0-KB#  
{ u00w'=pe)  
 if(nHookCount>1){ Ic2Q<V}oq  
  nHookCount--; 3JYhF)G  
  return TRUE; 7N:3  
 } TOT#l6yqdd  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M( w'TE@  
 if(unhooked==TRUE){ O06 2c)vIY  
  nHookCount=0; /U$5'BoS  
  hHook=NULL; ,3XlX(P  
 } 6v"WI@b4  
 return unhooked; '/="bSF  
} [~NJf3c"  
A@uU*]TqJ8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f/7on| bv  
{ &u`EYxT  
 BOOL bAdded=FALSE; )J^5?A  
 for(int index=0;index<MAX_KEY;index++){ @7HHi~1JK  
  if(hCallWnd[index]==0){ F8H4R7 8>;  
   hCallWnd[index]=hWnd; 8:t!m>(*  
   HotKey[index]=cKey; c,CcKy;+  
   HotKeyMask[index]=cMask; <)$&V*\  
   bAdded=TRUE; jOUM+QO  
   KeyCount++; 1.0:  
   break; a = *'  
  } Ztl?*zL  
 } s(Y2]X4 (  
 return bAdded; $E/N  
} } ~NM\rm  
CCHGd&\Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Nl]_Ie6  
{ aD^jlt  
 BOOL bRemoved=FALSE; NufRd/q  
 for(int index=0;index<MAX_KEY;index++){ ="p,~ivrz  
  if(hCallWnd[index]==hWnd){ }j$tFFVi~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MgO_gFr  
    hCallWnd[index]=NULL; < ]"Uy p  
    HotKey[index]=0; bL`># M_^  
    HotKeyMask[index]=0; ;nq"jm  
    bRemoved=TRUE; bvW3[ V  
    KeyCount--; ,(i`gH{D  
    break; q2 b>Z6!5  
   } 8vkCmV  
  } >,x&L[3  
 } 'yo-`nNFD  
 return bRemoved; T mK[^  
} K 0e*K=UM  
|.KB  
void VerifyWindow() |.z4VJi4  
{ {uDH-b(R  
 for(int i=0;i<MAX_KEY;i++){ qTrM*/m:]L  
  if(hCallWnd!=NULL){ 8-_atL  
   if(!IsWindow(hCallWnd)){ .],:pL9d  
    hCallWnd=NULL; *Sg6VGP  
    HotKey=0; 4|&_i)S-Y  
    HotKeyMask=0; ::p%R@?  
    KeyCount--; QE|x[?7e,!  
   } (gRTSd T ?  
  } LC7%Bfn!  
 } o2D;EUsNX  
} ,|g&v/WlC%  
x) jc  
BOOL CHookApp::InitInstance() ?8qN8rk^+  
{ %Rt 5$+dNT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  :yw8_D3  
 hins=AfxGetInstanceHandle(); "!Qi$ ]  
 InitHotkey(); b@S~ =  
 return CWinApp::InitInstance(); 7{tU'`P>  
} wg+[T;0S  
-FF#+Z$  
int CHookApp::ExitInstance() <(t{C8>g%  
{ bt*  
 VerifyWindow(); o@m7@$7  
 UnInit(); !K-qoBqKM  
 return CWinApp::ExitInstance(); X$Shi *U[  
} N\"Hf=Y(~  
X?YT>+g;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file % *ng *  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'l<Oj&E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :-_"[:t 5Z  
#if _MSC_VER > 1000 -_xTs(;|8  
#pragma once [!C!R$AMa  
#endif // _MSC_VER > 1000 |No9eZ8>.  
_?]W%R|  
class CCaptureDlg : public CDialog |!81M|H  
{ DUSQh+C  
 // Construction ? o&goiM  
 public: v^J']p  
  BOOL bTray; (}5};v  
  BOOL bRegistered; mPF<2:)wv  
  BOOL RegisterHotkey(); 4B9D  
  UCHAR cKey;  9mW   
  UCHAR cMask; {e$ @i  
  void DeleteIcon(); z6Fl$FFP  
  void AddIcon(); ZA&bp{}D  
  UINT nCount; mBEMwJ}O`  
  void SaveBmp(); ]Exbuc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor k]A =Q  
  // Dialog Data n<P&|RTZ  
  //{{AFX_DATA(CCaptureDlg) qm<-(Qc(W  
  enum { IDD = IDD_CAPTURE_DIALOG }; R|k:8v{V=  
  CComboBox m_Key; Pv=]7> e  
  BOOL m_bControl;  @EURp  
  BOOL m_bAlt; Y[|9 +T  
  BOOL m_bShift; ahdwoB   
  CString m_Path; 2%v6h  
  CString m_Number; p' 6h9/  
  //}}AFX_DATA O6vHo3k  
  // ClassWizard generated virtual function overrides DJ0jtv6nQ-  
  //{{AFX_VIRTUAL(CCaptureDlg) )gz]F_  
 public: gL~3z'$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $VjMd f  
 protected: 1Q=L/k eP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r:PYAb=g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &1Y7Ne  
  //}}AFX_VIRTUAL uJ=d!Kn  
  // Implementation WZn"I& Z  
 protected: KSJ+3_7 ]k  
  HICON m_hIcon; nI4oQE  
  // Generated message map functions z0x^HDAeC  
  //{{AFX_MSG(CCaptureDlg) ^?_MIS`4N  
  virtual BOOL OnInitDialog(); (/^?$~m"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S'`G7ht  
  afx_msg void OnPaint(); |'lNR)5  
  afx_msg HCURSOR OnQueryDragIcon(); -aLM*nIoe  
  virtual void OnCancel(); mN l[D  
  afx_msg void OnAbout(); PZvc4  
  afx_msg void OnBrowse(); AHMvh 7O?  
  afx_msg void OnChange(); S?zP; iFj  
 //}}AFX_MSG Q@|"xKa  
 DECLARE_MESSAGE_MAP() >sdF:(JV&  
}; #S] O|$&*  
#endif *%\Xw*\0  
Xg l %2'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mhM;`dl  
#include "stdafx.h" Y O|hwhe_  
#include "Capture.h" M?Fv'YE  
#include "CaptureDlg.h" #V)l>  
#include <windowsx.h> W9{;HGWS  
#pragma comment(lib,"hook.lib") =jA.INin4  
#ifdef _DEBUG c (29JZ  
#define new DEBUG_NEW Zx`/88!x[  
#undef THIS_FILE ~.6% %1?  
static char THIS_FILE[] = __FILE__; N A_8<B^  
#endif c6 .j$6t  
#define IDM_SHELL WM_USER+1 Zl>wWJ3y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {t4':{Y+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3DxgfP%n  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WZjR^ 6  
class CAboutDlg : public CDialog lYS "  
{ @Z7s3b  
 public: vXZP>  
  CAboutDlg(); ?%%vQ ?  
  // Dialog Data 3 g:P>(  
  //{{AFX_DATA(CAboutDlg) SmRFxqtN  
  enum { IDD = IDD_ABOUTBOX }; unRFcjEa  
  //}}AFX_DATA J7`;l6+Gb  
  // ClassWizard generated virtual function overrides 4uh~@Lv  
  //{{AFX_VIRTUAL(CAboutDlg) ks69Z|D  
 protected: 1d842pt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @\:@_}Z`_}  
  //}}AFX_VIRTUAL /cVZ/"  
  // Implementation VD $PoP  
 protected: >s!k"s,  
  //{{AFX_MSG(CAboutDlg) Y9 Bk$$#\  
  //}}AFX_MSG asE.!g?  
  DECLARE_MESSAGE_MAP()  z).&0K  
}; fh66Gn,  
\F\xZ.r  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Gm> =s  
{ I~E&::,  
 //{{AFX_DATA_INIT(CAboutDlg) &|h9L'mr  
 //}}AFX_DATA_INIT z_#HJ}R=  
} X{[$4\di{  
ug'^$geM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E(z|LS*3  
{ k py)kS  
 CDialog::DoDataExchange(pDX); /!.]Y8yEH  
 //{{AFX_DATA_MAP(CAboutDlg) GO*D4<#u  
 //}}AFX_DATA_MAP Nx+5rp  
}  XF>!~D  
5Q:49S47  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t\PSB  
 //{{AFX_MSG_MAP(CAboutDlg) >6W#v[  
 // No message handlers 7Bd=K=3u  
 //}}AFX_MSG_MAP n 4co s  
END_MESSAGE_MAP() HX,i{aWWy  
~0o>B$xJ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) IFZw54  
: CDialog(CCaptureDlg::IDD, pParent) sO!m,pK(  
{ |9BX  ~`{  
 //{{AFX_DATA_INIT(CCaptureDlg) c>T)Rc  
  m_bControl = FALSE; LF)wn -C}  
  m_bAlt = FALSE; 7VdxQ T  
  m_bShift = FALSE; ] yWywa\  
  m_Path = _T("c:\\"); D{q r N6g#  
  m_Number = _T("0 picture captured."); uJ fXe  
  nCount=0; ]l3Y=Cl  
  bRegistered=FALSE; T-iQ!D~  
  bTray=FALSE; V}~',o<m  
 //}}AFX_DATA_INIT |N3#of(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %sPq*w.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $Y\7E/T  
} %Na` \`L{F  
cBU3Q<^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hBifn\dFr  
{ ah(k!0PV  
 CDialog::DoDataExchange(pDX); d DAl n+  
 //{{AFX_DATA_MAP(CCaptureDlg) DeeV;?:  
  DDX_Control(pDX, IDC_KEY, m_Key); JuOCOl\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); S\GxLW@x  
  DDX_Check(pDX, IDC_ALT, m_bAlt); +D[C.is>]}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5`lVC$cP  
  DDX_Text(pDX, IDC_PATH, m_Path); T.B7QAI. H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wbk$(P'gN  
 //}}AFX_DATA_MAP obv_?i1  
} S)'&+HamI  
ELg$tc  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) sXT8jLIf  
//{{AFX_MSG_MAP(CCaptureDlg) ixoN#'y<"  
 ON_WM_SYSCOMMAND() 7{k?" NF  
 ON_WM_PAINT() SL\15`[{  
 ON_WM_QUERYDRAGICON() fP8bWZ{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) PCa0I^d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) K$s{e0 79  
 ON_BN_CLICKED(ID_CHANGE, OnChange) SLH;iqPT  
//}}AFX_MSG_MAP rd24R-6  
END_MESSAGE_MAP() 8o).q}>&  
<K>qK]|C  
BOOL CCaptureDlg::OnInitDialog() m,6[;  
{ fEt BodA)  
 CDialog::OnInitDialog(); T{N8 K K  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _Kh8 <$h  
 ASSERT(IDM_ABOUTBOX < 0xF000); mtw{7 E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); IJ:JH=8  
 if (pSysMenu != NULL) V@EyU/VJ  
 { 5yj6MaqJ  
  CString strAboutMenu; .ezZ+@LI+#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _fHj8- s/  
  if (!strAboutMenu.IsEmpty()) ;E!] /oY<  
  { YM.  
   pSysMenu->AppendMenu(MF_SEPARATOR); G c ,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mgodvX  
  } :o~ ]d  
 } SP>&+5AydX  
 SetIcon(m_hIcon, TRUE); // Set big icon N-Bw&hEZ  
 SetIcon(m_hIcon, FALSE); // Set small icon K!2%8Ej,J  
 m_Key.SetCurSel(0); w6-<HPW<S  
 RegisterHotkey(); g@>93j=cZU  
 CMenu* pMenu=GetSystemMenu(FALSE); myd:"u,}9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nyOmNvZf  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6uk}4bdvq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I= cayR  
 return TRUE; // return TRUE unless you set the focus to a control ~~m(CJ4S  
} =8"xQ>D62  
r029E-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^7t1'A8e<  
{ */|<5X;xIA  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d7:=axo,  
 { Ka%#RNW  
  CAboutDlg dlgAbout; i.KRw6  
  dlgAbout.DoModal(); kjOkPp  
 } lg{/5gQG  
 else !-&;t7R  
 { )@=fGNDt  
  CDialog::OnSysCommand(nID, lParam); [dqh-7  
 } ''q#zEf6  
} P{: 5i%qC  
k%aJ%(  
void CCaptureDlg::OnPaint() SO<9?uk.  
{ 8,e%=7h_e  
 if (IsIconic()) dOKe}?}==  
 { Q|U [|U  
  CPaintDC dc(this); // device context for painting T {=&>pNK[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @%fL*^yr;C  
  // Center icon in client rectangle 6* 0vUy*"  
  int cxIcon = GetSystemMetrics(SM_CXICON); >Nx4 +|  
  int cyIcon = GetSystemMetrics(SM_CYICON); p9S>H  
  CRect rect; [| N73m,&  
  GetClientRect(&rect); !\^W*nQ>l  
  int x = (rect.Width() - cxIcon + 1) / 2; oR3t vw.  
  int y = (rect.Height() - cyIcon + 1) / 2; CW.T`F  
  // Draw the icon !;${2Q  
  dc.DrawIcon(x, y, m_hIcon); ocZ^rqo2w  
 } mMO]l(a&  
 else FchO 6O  
 { $e{}SQ;fW  
  CDialog::OnPaint(); 2lqy<o  
 } ),^pi?  
} A8:eA  
VssWtL  
HCURSOR CCaptureDlg::OnQueryDragIcon() K}'?#a(aX=  
{ Y.#fpG'  
 return (HCURSOR) m_hIcon; 10bv%ZX7  
} _c}# f\ +_  
E@AV?@<sc  
void CCaptureDlg::OnCancel() HK%W7i/k@  
{ j[dgY1yE:  
 if(bTray) NYzBfL x  
  DeleteIcon(); VSh&Y_%  
  CDialog::OnCancel(); Nu'ox. V  
} \eRct_  
Nx E=^ v  
void CCaptureDlg::OnAbout() QUh`kt(E  
{ 6` Aw!&{  
 CAboutDlg dlg; s%RG_"l  
 dlg.DoModal(); \5Y<UJ Ki  
} >5D;uTy u  
ViG>gMGv  
void CCaptureDlg::OnBrowse() \p]B8hLW  
{ #wZH.i #  
 CString str; @Y}G,i  
 BROWSEINFO bi; _>8Q{N\- {  
 char name[MAX_PATH]; $I4Wl:(~}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U"~W3vwJ  
 bi.hwndOwner=GetSafeHwnd(); KleiX7  
 bi.pszDisplayName=name; T8yMaC  
 bi.lpszTitle="Select folder"; io@f5E+?  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *.Z~f"SZy*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6qWWfm/6  
 if(idl==NULL) ,zxv>8Nt  
  return; \Pe+]4R-Xo  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P4+PY 8  
 str.ReleaseBuffer(); b/ h#{'  
 m_Path=str; rj4R/{h  
 if(str.GetAt(str.GetLength()-1)!='\\') {kr14 l*2  
  m_Path+="\\"; M5L/3qLh1  
 UpdateData(FALSE); ~qK/w0=j  
} \)ZCB7|  
}<*KM)%  
void CCaptureDlg::SaveBmp() tf[)| /M  
{ 3Vak C  
 CDC dc; i4XiwjCHN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ru4M=D  
 CBitmap bm; b`F]oQ_*  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2.MY8}&WBu  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2. v<pqn  
 bm.CreateCompatibleBitmap(&dc,Width,Height); > `0mn|+  
 CDC tdc; 15r=d  
 tdc.CreateCompatibleDC(&dc); 9Hd_sNUu\  
 CBitmap*pOld=tdc.SelectObject(&bm); y*p02\)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FW|_8q?}<  
 tdc.SelectObject(pOld); 9PMIF9"   
 BITMAP btm; \k^ojzJ  
 bm.GetBitmap(&btm); 8 VhU)fY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g!9|1z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); l[rK)PM   
 BITMAPINFOHEADER bih; h[Uo6`  
 bih.biBitCount=btm.bmBitsPixel; <1 ;pyw y  
 bih.biClrImportant=0; e+MQmW A'F  
 bih.biClrUsed=0; !Lw]aHb  
 bih.biCompression=0; <XN=v!2;  
 bih.biHeight=btm.bmHeight; NCl@C$W9q  
 bih.biPlanes=1; IDL0!cF  
 bih.biSize=sizeof(BITMAPINFOHEADER); ml /S|`Drk  
 bih.biSizeImage=size; Yy6$q\@rV  
 bih.biWidth=btm.bmWidth; ?Ygd|a5  
 bih.biXPelsPerMeter=0;  Lw%_xRn)  
 bih.biYPelsPerMeter=0; Qkhor-f0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $48 Z>ij?f  
 static int filecount=0; D3%2O`9  
 CString name; 1Kd6tnX  
 name.Format("pict%04d.bmp",filecount++); &HtTh {  
 name=m_Path+name; o"_'cNAz  
 BITMAPFILEHEADER bfh; r4<aEj;l  
 bfh.bfReserved1=bfh.bfReserved2=0; e[0"x. gu  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `csZ*$7  
 bfh.bfSize=54+size; p@[ fZj  
 bfh.bfOffBits=54; < fV][W  
 CFile bf; yc`*zLWh  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J0oeCb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +-,iC6kK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vjw u:M  
  bf.WriteHuge(lpData,size); JbQY{z!  
  bf.Close(); -3guuT3x\  
  nCount++; mCG&=Fx  
 } $L?KNXHAF!  
 GlobalFreePtr(lpData); d325Cw?  
 if(nCount==1) vm'ZA7f6  
  m_Number.Format("%d picture captured.",nCount); CPMGsW^  
 else RBBmGZ  
  m_Number.Format("%d pictures captured.",nCount); >k/cm3  
  UpdateData(FALSE); U4<c![Pp.  
} >?rMMR+A  
h72CGA|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) " 0m4&K(3,  
{ h9#)Eo   
 if(pMsg -> message == WM_KEYDOWN) z^z`{B  
 { fc9@l a  
  if(pMsg -> wParam == VK_ESCAPE) ]5Dh<QY&.  
   return TRUE; Iy&,1CI"]  
  if(pMsg -> wParam == VK_RETURN) WqF$-rBJG^  
   return TRUE; 0!7p5  
 } ! Dj2/][  
 return CDialog::PreTranslateMessage(pMsg); V; CPn  
} S!+>{JyQ  
X6 N&:<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7 nFOV Z  
{ / *PHX@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  bLAHVi<.  
  SaveBmp(); 2#r4dr0  
  return FALSE; :tI F*pC  
} ,v,rY'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0H]{,mVs  
 CMenu pop; a @d 15CN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9dBxCdpu  
 CMenu*pMenu=pop.GetSubMenu(0); ,&qC R sw  
 pMenu->SetDefaultItem(ID_EXITICON); t(9q 6x3|e  
 CPoint pt; }m~MN4 l  
 GetCursorPos(&pt); @un+y9m[C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S2_(lS+R  
 if(id==ID_EXITICON) 5j6`W?|q  
  DeleteIcon(); ~!!| #A)W  
 else if(id==ID_EXIT) |ns?c0rM  
  OnCancel(); )>S,#_e*b  
 return FALSE; Z6A-i@  
} nSC2wTH!1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); F= %A9b_a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ?Ve I lD  
 AddIcon(); `fTM/"  
 return res; Y)+q[MZ R  
} +yHz7^6-5  
c38XM]Jeq  
void CCaptureDlg::AddIcon() 4=MjyH|[Jx  
{ CgrQ" N5  
 NOTIFYICONDATA data; mbGma  
 data.cbSize=sizeof(NOTIFYICONDATA); l-l7jq]R  
 CString tip; -!:5jfT"  
 tip.LoadString(IDS_ICONTIP); \ "$$c  
 data.hIcon=GetIcon(0); OTdijQLY  
 data.hWnd=GetSafeHwnd(); AyOibnoZ2E  
 strcpy(data.szTip,tip); rxH]'6kP  
 data.uCallbackMessage=IDM_SHELL; 1{ %y(?`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qS FtQ4  
 data.uID=98; jWv'`c  
 Shell_NotifyIcon(NIM_ADD,&data); F!wz{i6\h  
 ShowWindow(SW_HIDE); oSC'b%  
 bTray=TRUE; -4& i t:  
} NX.xE W@  
OmO#} k<  
void CCaptureDlg::DeleteIcon() $R1I(sJ  
{ ,0 q1Id  
 NOTIFYICONDATA data; ]MosiMJF  
 data.cbSize=sizeof(NOTIFYICONDATA); h0@a"DqK  
 data.hWnd=GetSafeHwnd(); %.<_+V#h  
 data.uID=98; W%-XN   
 Shell_NotifyIcon(NIM_DELETE,&data); U/QgO  
 ShowWindow(SW_SHOW); |#kY_d)10  
 SetForegroundWindow(); rUj\F9*5#  
 ShowWindow(SW_SHOWNORMAL); ]b!n ;{5  
 bTray=FALSE; G~YZ(+V%~  
} voRry6Q;  
)J}v.8   
void CCaptureDlg::OnChange() U5OX.0  
{ 9ziFjP+1  
 RegisterHotkey(); <78|~SKAV  
} _wS=*-fT  
(^m] 7l  
BOOL CCaptureDlg::RegisterHotkey() 0!_?\)X  
{ #e|o"R;/`  
 UpdateData(); 2 HEU  
 UCHAR mask=0; dD=$$( je  
 UCHAR key=0; a3tcLd|7J  
 if(m_bControl) 49$<:{~  
  mask|=4; 7upko9d/  
 if(m_bAlt) ]HuB%G|t1V  
  mask|=2; _9 ]:0bDUo  
 if(m_bShift) :Kwu{<rJ!(  
  mask|=1; <f>w"r  
  key=Key_Table[m_Key.GetCurSel()]; \7r0]& _  
 if(bRegistered){ Wye* ~t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]VRa4ZB{u  
  bRegistered=FALSE; Qs6Vu)U=  
 } 5M0Q'"`F:  
 cMask=mask; L(VFzPkY%  
 cKey=key; bOFzq>k_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7v ZD  
 return bRegistered; <gkE,e9  
} alaL/p{O  
Yi*F;V   
  四、小结 &>,;ye>A  
ctZ,qg*N  
  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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