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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: 8 1K G1i)  
  1|EU5<  
  一、实现方法 -m'3L7:  
jdg ~!<C  
  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: Nzi/3r7m  
R3{*v =ov  
#pragma data_seg("shareddata") [mB(GL  
HHOOK hHook =NULL; //钩子句柄 rxgVT4  
UINT nHookCount =0; //挂接的程序数目 tY$ty0y-e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]k`Fl,"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4'{hI;&a&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3^A/`8R7K  
static int KeyCount =0; ,F?~'-K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 28Ssb|  
#pragma data_seg() ;x3 ]4^  
J<($L}T*$  
  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。 nhQ44qRgQ  
AeY$.b  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Bsu=^z  
! F;<xgw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =wlm  
cKey,UCHAR cMask) o9T@uWh+  
{ cdJ`Gk  
 BOOL bAdded=FALSE; (@WDvgi(  
 for(int index=0;index<MAX_KEY;index++){ 8MeO U  
  if(hCallWnd[index]==0){ .i3lG( YG  
   hCallWnd[index]=hWnd; 6h:?u4  
   HotKey[index]=cKey; Ql: b1C,  
   HotKeyMask[index]=cMask; /8WpX  
   bAdded=TRUE; DUuC3^R  
   KeyCount++; {glqWFT  
   break; 2iR:*}5  
  } tJ h3$K\  
 } v/aPiFlw  
 return bAdded; KT lP:pB;  
} *m| t =9E  
//删除热键 ph8Jn+|E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |>IUtUg\  
{ 0?6 If+AC  
 BOOL bRemoved=FALSE; :?$Sb8OuIL  
 for(int index=0;index<MAX_KEY;index++){ ){:q;E]^fB  
  if(hCallWnd[index]==hWnd){ /H%<oAjp6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3I;xU(rv  
    hCallWnd[index]=NULL; a*W_fxb  
    HotKey[index]=0; %<=w[*i  
    HotKeyMask[index]=0; .o\;,l2  
    bRemoved=TRUE; \`P2Yq  
    KeyCount--; clq~ ;hx  
    break; DYT@BiW{  
   } M}=s3[d(,  
  } #7-kL7 MK]  
 }  \8>  
 return bRemoved; 0\EpH[m}-  
} bRK CY6  
wuBlFUSg  
z<yNG/M1>U  
  DLL中的钩子函数如下: e>?_)B4  
v9t4 7>V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^)9MzD^_nV  
{ "RV`L[(P*k  
 BOOL bProcessed=FALSE; }&Wp3EWw  
 if(HC_ACTION==nCode) |8DH4*y!  
 { Z^'?|qFj!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )KaLSL>  
   switch(wParam) wVvqw/j*f  
   {  P7'oXtW{o  
    case VK_MENU: KrdZEi vb  
     MaskBits&=~ALTBIT; }@rg5$W  
     break; 9S:{  
    case VK_CONTROL: dN]Zs9]  
     MaskBits&=~CTRLBIT; inr%XS/m  
     break; (C-,ljY  
    case VK_SHIFT: DD12pL{QA  
     MaskBits&=~SHIFTBIT; zz(!t eBC  
     break; 2~G,Ia  
    default: //judge the key and send message X zi'Lu `  
     break; $zk^yumdE  
   } L,Ao.?j  
   for(int index=0;index<MAX_KEY;index++){ {h/OnBwG  
    if(hCallWnd[index]==NULL) %XEKhy  
     continue; 0On? {Bw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qYgwyj=4  
    { kfMhw M8kP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QHHW(InG<  
     bProcessed=TRUE; ZdE>C   
    } a)3O? Y  
   } Vl5SL{+D  
  } _o@(wGeu#  
  else if((lParam&0xc000ffff)==1){ //有键按下 G$?|S@I,  
   switch(wParam) 4zo4H~@gk  
   { ~q0I7M  
    case VK_MENU: [,OJX N-4s  
     MaskBits|=ALTBIT; W]@gQ (Ef  
     break; 'GEBxNH:  
    case VK_CONTROL: ;;EDN45  
     MaskBits|=CTRLBIT; wF|0n t  
     break; Yw$a{5g  
    case VK_SHIFT: {l&Ltruhz  
     MaskBits|=SHIFTBIT; l^DINZU@  
     break; (Oxz'#TX  
    default: //judge the key and send message A[u)wX^`f^  
     break; Vk MinE  
   } l,*yEkU  
   for(int index=0;index<MAX_KEY;index++){ JP{UgcaF  
    if(hCallWnd[index]==NULL) 5SoZ$,a<e  
     continue; NoFs-GGGh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dO>k5!ge|:  
    { <Vz<{W3t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i0k+l  
     bProcessed=TRUE; hnp`s%e,  
    } XXa(305  
   } a{<p '_  
  } >Y7r \  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 y bo#K  
   for(int index=0;index<MAX_KEY;index++){ YniZ( ~^K  
    if(hCallWnd[index]==NULL) |ZS 57c:  
     continue; 7%{R#$F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Hze-Ob8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G 6Wx3~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 nqZA|-}  
   } W3^zIj  
  } `d75@0:  
 } c5X`_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q:vz?G  
} 1*Sr5N[=  
. _1jk  
  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: g d z  
aRbx   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lkV6qIj   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,VPbUo@  
S3SV.C:z>  
  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: 'I&|1I^  
,`;jvY~Ec  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ./#e1m?.  
{ 'dkXYtKCB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #2h+dk$1  
 { Ds {{J5Um%  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 i\(\MzW*'  
  SaveBmp(); M(qxq(#{U  
  return FALSE; 3rxo,pX94  
 } CXTt(-FT  
 …… //其它处理及默认处理 kGpV;F==*  
} Ee&hG[sx  
} <SNO)h3  
vKU`C?,L  
  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。 :bwM]k*$  
=g@R%NDNV  
  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。 zu52 p4  
CE{z-_{ ^  
  二、编程步骤 D,k(~  
I[ai:   
  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"; g]za"U|g  
9ftN8Svw  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fCB:733H  
DMB"Y,  
  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; cFLd)mt/  
O:1DOUYXs  
  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; NUMi])HkN  
3@G;'|z  
  5、 添加代码,编译运行程序。 WE")xhV6  
)%s +?  
三、程序代码 B#]_8svO  
tVunh3-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL S."7+g7Ar  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) X:Q$gO?[4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ gA_krK ,Z  
#if _MSC_VER > 1000 vVAb'`ysv  
#pragma once 7$ d}!S  
#endif // _MSC_VER > 1000 qbXz7s*{  
#ifndef __AFXWIN_H__ fE^uF[-7?  
#error include 'stdafx.h' before including this file for PCH job[bhK'Jt  
#endif sAVefL?  
#include "resource.h" // main symbols @&5A&(  
class CHookApp : public CWinApp 4b4QbJ$  
{ aM$\#Cx  
 public: eaQ90B4  
  CHookApp(); f/ajejYo?,  
  // Overrides AliRpxxd  
  // ClassWizard generated virtual function overrides ~n6[$WjZA  
  //{{AFX_VIRTUAL(CHookApp) ;-Ss# &  
 public: 1~'_K9eE  
  virtual BOOL InitInstance(); |q_ !. a  
  virtual int ExitInstance(); ('t kZt%8  
  //}}AFX_VIRTUAL >!}`%pk(  
  //{{AFX_MSG(CHookApp)  QsOhz  
  // NOTE - the ClassWizard will add and remove member functions here. =E y`M#t;  
  // DO NOT EDIT what you see in these blocks of generated code ! n>P! u71  
  //}}AFX_MSG Noh?^@T`Ov  
  DECLARE_MESSAGE_MAP() A:eG5K}  
}; _R7 w?!t8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t}Ss=0dJO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :mpiAs<%U"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =OYQM<q  
BOOL InitHotkey(); W/r^ugDV  
BOOL UnInit(); I]X  
#endif cOkgoL" 4  
H?uukmZl  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4 \p -TPM  
#include "stdafx.h" x l0DN{PG  
#include "hook.h" aX^+ O,  
#include <windowsx.h> Pdw#o^Iq^  
#ifdef _DEBUG 4<.O+hS  
#define new DEBUG_NEW r~8;kcu7  
#undef THIS_FILE DZe}y^F  
static char THIS_FILE[] = __FILE__; 5 lTD]d  
#endif .^[_ V  
#define MAX_KEY 100 .$ Bwb/a  
#define CTRLBIT 0x04 %9o+zg? RJ  
#define ALTBIT 0x02 M^6$ MMx  
#define SHIFTBIT 0x01 W&(f&{A  
#pragma data_seg("shareddata") LmQ/#Gx  
HHOOK hHook =NULL; Z)&D`RCf  
UINT nHookCount =0; z/1{OL  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 9cd8=][  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K)S;:MLG=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey z856 nl  
static int KeyCount =0; >|3a 9S  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0@)%h&mD  
#pragma data_seg() frN3S  
HINSTANCE hins; r7 VXeoX  
void VerifyWindow(); NP/>H9Q2%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) zoP%u,XL  
//{{AFX_MSG_MAP(CHookApp) @Z;1 g  
// NOTE - the ClassWizard will add and remove mapping macros here. F Z!J  
// DO NOT EDIT what you see in these blocks of generated code! Y-p<qL|_  
//}}AFX_MSG_MAP \k@Z7+&7  
END_MESSAGE_MAP() +;q.Y?  
H9` f0(H  
CHookApp::CHookApp() xd8 *<,Wj  
{ )ofm_R'q*  
 // TODO: add construction code here, #tjmWGo,  
 // Place all significant initialization in InitInstance t`G)b&3_O  
} :eOR-}p'  
nrpI5t.b  
CHookApp theApp; 8g*hvPc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *7" L]6  
{ 4_LQ?U>$  
 BOOL bProcessed=FALSE; #Qbl=o4  
 if(HC_ACTION==nCode) '#Dg8/r!  
 { {J]-<:XD  
  if((lParam&0xc0000000)==0xc0000000){// Key up YQgNv` l}  
   switch(wParam) ],lV}Mlg*  
   { |d7$*7TvV  
    case VK_MENU: G> \T bx  
     MaskBits&=~ALTBIT; LdTdQ,s<  
     break; wAYB RY[  
    case VK_CONTROL: C+%K6/J(  
     MaskBits&=~CTRLBIT; lIf(6nm@  
     break; ^0tw%6:  
    case VK_SHIFT: KJh,,xI>by  
     MaskBits&=~SHIFTBIT; mm[SBiFO\  
     break; otr>3a*'  
    default: //judge the key and send message B@t'U=@7  
     break; .Q>!B?)  
   } 61_f3S(u  
   for(int index=0;index<MAX_KEY;index++){ 2cf' ,cv@8  
    if(hCallWnd[index]==NULL) 2~c~{ jl\  
     continue; ?Zz'|.l@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [@"wd_f{l  
    { cxP6-tV%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c ~F dx  
     bProcessed=TRUE; naNyGE7)  
    } TJy4<rb  
   } }$g mK  
  } M>l^%`  
  else if((lParam&0xc000ffff)==1){ //Key down R,Oe$J<  
   switch(wParam) {6 .o=EyM{  
   { \cuS>G  
    case VK_MENU: } /:\U p  
     MaskBits|=ALTBIT; Yrn"saVc,  
     break; Jx|I6 y  
    case VK_CONTROL: HIf{Z* mb  
     MaskBits|=CTRLBIT; #^rU x.  
     break; 2KI!af[I  
    case VK_SHIFT: ]hTb@.  
     MaskBits|=SHIFTBIT; v{;7LXy0  
     break; RL}KAGK  
    default: //judge the key and send message YQ(Po!NI\'  
     break; 2t1I3yA'{z  
   } `/Y+1 aD  
   for(int index=0;index<MAX_KEY;index++) q'S =Eav8  
   { cd.brM  
    if(hCallWnd[index]==NULL) .%xzT J=!  
     continue; %_gho  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >q7 %UK]&  
    { 68t}w^=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j+^L~, S  
     bProcessed=TRUE; )\ 0F7Z  
    } 5/I_w0  
   } WDx Mo`zT  
  } ?Zcj}e.r  
  if(!bProcessed){ \pY^^ l*  
   for(int index=0;index<MAX_KEY;index++){ -50AX1h31:  
    if(hCallWnd[index]==NULL) G'#41>q+  
     continue; ..KwTf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?m"|QS!!K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N$alUx*  
   } V@ :20m  
  } ~&VN_;j_  
 } F0dI/+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cFZCf8:zB  
} BzbDZV  
,Og4 ?fS  
BOOL InitHotkey() ^toAw8A=@0  
{ uJow7-FD  
 if(hHook!=NULL){ FY#!N L  
  nHookCount++; H;KDZO9W  
  return TRUE; Ax<\jW<  
 } t[C1z  
 else @}LZ! y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); w:ULi3  
  if(hHook!=NULL) [ygF0-3ND  
   nHookCount++;  <!'M} s  
  return (hHook!=NULL); UpUp8%fCU  
} :Jxh2  
BOOL UnInit() <,8l *1C  
{ ;j} yB  
 if(nHookCount>1){ 6m`{Z`c$  
  nHookCount--; -l*g~7|j  
  return TRUE; F9Z @x)  
 } +]!lS7nsW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #MgvG,  
 if(unhooked==TRUE){ nkY@_N  
  nHookCount=0; bI ITPxz  
  hHook=NULL; l?E|R Kp  
 } 2V gP  
 return unhooked; cvo[s, p  
} +1`t}hO  
v%91k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]n v( aM?d  
{ tS?lB05TOR  
 BOOL bAdded=FALSE; BGWAh2w6  
 for(int index=0;index<MAX_KEY;index++){ < K %j  
  if(hCallWnd[index]==0){ X"*^l_9-v  
   hCallWnd[index]=hWnd; H5xzD9K;/C  
   HotKey[index]=cKey; _6LoVS  
   HotKeyMask[index]=cMask; pj{\T?(  
   bAdded=TRUE; v,1F-- v  
   KeyCount++;  .5Z_E O  
   break; ,0?!ov|  
  } =!0I_L/  
 } NGTe4Crx  
 return bAdded; RUXCq`)"<  
} Dkw7]9Qm  
hnxc`VX>g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JLm @Ag  
{ WH$HI/%*m  
 BOOL bRemoved=FALSE; +;gsRhWk  
 for(int index=0;index<MAX_KEY;index++){ {d!Y3+I%G  
  if(hCallWnd[index]==hWnd){ Ijo(^v@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8;zDg$ (  
    hCallWnd[index]=NULL; *xH\)|3,  
    HotKey[index]=0; RU_L<Lpi  
    HotKeyMask[index]=0; R]L2(' B  
    bRemoved=TRUE; =_-C%<4  
    KeyCount--;  s>[{}7ca  
    break; 8LrK94  
   } 2p< Aj!  
  } iuAq.$oi{  
 } Sb"2Im>  
 return bRemoved; t4K56H.L?  
} km 5E)_]  
S/Oxr%H  
void VerifyWindow() >FFVY{F  
{ #A<"4#}  
 for(int i=0;i<MAX_KEY;i++){ U^$E'Q-VK  
  if(hCallWnd!=NULL){ @ss):FwA  
   if(!IsWindow(hCallWnd)){ J$[Q?8 ka  
    hCallWnd=NULL; m&El)  
    HotKey=0; i21QJ6jPcI  
    HotKeyMask=0; ukihx?5  
    KeyCount--; kk_zVrQ<  
   } nCaLdj?  
  } NMXM[Ukb  
 } QJXdb]Y^;  
} Pj!%ym3A  
R^tcr)(  
BOOL CHookApp::InitInstance() 0wvU?z%WK  
{ VGJDqm!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,nYZxYLf+  
 hins=AfxGetInstanceHandle(); `d`&R.'  
 InitHotkey(); ETelbj;0  
 return CWinApp::InitInstance(); ^!uO(B&  
} q/'MS[C  
yJJ8 "s~i  
int CHookApp::ExitInstance() `A{'s %$?!  
{ gKQ@!U U8  
 VerifyWindow(); 2np-Fc{S  
 UnInit(); =t.F2'<[Z  
 return CWinApp::ExitInstance(); .v l="<  
} U_Y;fSl>  
opnkmM&[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file f#c BQ~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9/H^t* 5t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ R\ e#$"a5  
#if _MSC_VER > 1000 %w@ig~vD'  
#pragma once :|fl?{E  
#endif // _MSC_VER > 1000 3H <`Z4;  
o HRbAE^  
class CCaptureDlg : public CDialog Nc:U4  
{ !$XO U'n  
 // Construction T/ Ez*iQW  
 public: ?e2Y`0  
  BOOL bTray; ]Y$&78u8t  
  BOOL bRegistered; *fOIq88  
  BOOL RegisterHotkey(); '[xut1{  
  UCHAR cKey; ~Gwas0e Na  
  UCHAR cMask; @OrXbG7&>#  
  void DeleteIcon(); 6yi/&#YM  
  void AddIcon(); Xe> ~H4I9  
  UINT nCount; ~.!?5(AH8z  
  void SaveBmp(); f`bIQ9R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H|x k${R`  
  // Dialog Data P@-R5GK  
  //{{AFX_DATA(CCaptureDlg) <vO8_2,V-  
  enum { IDD = IDD_CAPTURE_DIALOG }; wsna5D6i  
  CComboBox m_Key; =7H.F:BBG  
  BOOL m_bControl; }% FDm@+  
  BOOL m_bAlt; ~c9vdK  
  BOOL m_bShift; #{?m  
  CString m_Path; R|6RI}  
  CString m_Number; ByC1I.B`  
  //}}AFX_DATA WJBW:2=;  
  // ClassWizard generated virtual function overrides (#CB q  
  //{{AFX_VIRTUAL(CCaptureDlg) EPR(i#xU  
 public: Qdh"X^^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )3+xsnv  
 protected: m]  EDuW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {lTR/  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); he_HVRpB  
  //}}AFX_VIRTUAL [%7IQ4`{  
  // Implementation iRkOH]+K  
 protected: (4E.Li<O  
  HICON m_hIcon; Y!Usce  
  // Generated message map functions !Q<8c =f  
  //{{AFX_MSG(CCaptureDlg) !tm|A`<g#<  
  virtual BOOL OnInitDialog(); g%Th_=qy  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _ +0uju?o}  
  afx_msg void OnPaint(); ".Tf< F  
  afx_msg HCURSOR OnQueryDragIcon(); Y*h`),  
  virtual void OnCancel(); l;"ub^AH  
  afx_msg void OnAbout(); 6C@0[Q\ER  
  afx_msg void OnBrowse(); 6kgCS{MZ  
  afx_msg void OnChange(); mkKRC;  
 //}}AFX_MSG 'Y,+D`&i)  
 DECLARE_MESSAGE_MAP() dw=Xjyk?h  
}; \1eKY^)2  
#endif >Rx8 0  
P\Pc/[ Z7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /zDSlj<c  
#include "stdafx.h" h$:&1jVY{  
#include "Capture.h" od|N-R  
#include "CaptureDlg.h" s /k  
#include <windowsx.h> {H~8'K-  
#pragma comment(lib,"hook.lib") +c~O0U1  
#ifdef _DEBUG q70YNk}  
#define new DEBUG_NEW Q>#)LHX  
#undef THIS_FILE qHcY 2LV  
static char THIS_FILE[] = __FILE__; ;m M\, {Z  
#endif ={wjeRp  
#define IDM_SHELL WM_USER+1 3P<Zzt%eT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?45K%;.9Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J$eZLj  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oPCIlH  
class CAboutDlg : public CDialog ijR*5#5h  
{ Z7k1fv:S^  
 public: ]h`E4B  
  CAboutDlg(); yA`]%U((  
  // Dialog Data yx`r;|ds}  
  //{{AFX_DATA(CAboutDlg) ]#WX|0''^  
  enum { IDD = IDD_ABOUTBOX }; t9=|* =;9)  
  //}}AFX_DATA }I'>r(K  
  // ClassWizard generated virtual function overrides q>Ar.5&M_  
  //{{AFX_VIRTUAL(CAboutDlg) lD+y, ";  
 protected: F".IB^} $  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support joSr,'x  
  //}}AFX_VIRTUAL 1)c=15^  
  // Implementation Vq;{+j(  
 protected: N5I W@?4  
  //{{AFX_MSG(CAboutDlg) B@~eBU,$  
  //}}AFX_MSG - KoA[UJ  
  DECLARE_MESSAGE_MAP() o<eWg  
}; x]jdx#'  
6iA c@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dwsy(g7  
{ pCud` :o"  
 //{{AFX_DATA_INIT(CAboutDlg) ZLFdnC@  
 //}}AFX_DATA_INIT J{'zkR?Lr  
} l1.Aw|'D  
|M{,}.*CU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ysw6hVb  
{ ?X5glDZ$  
 CDialog::DoDataExchange(pDX); `HZHVV$~  
 //{{AFX_DATA_MAP(CAboutDlg) hdNZ":1s  
 //}}AFX_DATA_MAP bI6V &Dd  
} \T#(rt\j  
nms<6kfzL  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p Z|nn  
 //{{AFX_MSG_MAP(CAboutDlg) ,"lBS?  
 // No message handlers 1:~m)"?I_^  
 //}}AFX_MSG_MAP p<^/T,&I  
END_MESSAGE_MAP()  TVEF+t  
2>_LX!kyP]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) n4 6PQm%p  
: CDialog(CCaptureDlg::IDD, pParent) .4m3@!qo)E  
{ )]e d;V  
 //{{AFX_DATA_INIT(CCaptureDlg) QIxJFr;>  
  m_bControl = FALSE; ]t!}D6p  
  m_bAlt = FALSE; '-1jWw:8  
  m_bShift = FALSE; <45dy5!Tz  
  m_Path = _T("c:\\"); 2K7:gd8Ru  
  m_Number = _T("0 picture captured."); aN);P>  
  nCount=0; ]oZ,{Q5~  
  bRegistered=FALSE; CSg5i&A=  
  bTray=FALSE; m{=~| I  
 //}}AFX_DATA_INIT :!it7vZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +^% &8<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9#$V1(}?  
} *Uw#  
:?of./Df|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WaZ@  
{ w<^2h}5  
 CDialog::DoDataExchange(pDX); @'| 6lG  
 //{{AFX_DATA_MAP(CCaptureDlg) E/Gs',Y  
  DDX_Control(pDX, IDC_KEY, m_Key); n<(5B|~y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); UBk 5O&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U3R`mHr0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :|6D@  
  DDX_Text(pDX, IDC_PATH, m_Path); .$E~.6J %i  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8 $*cfOC  
 //}}AFX_DATA_MAP TKs@?Q,J  
} rgY?X$1q_  
@42lpreT  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }n&JZ`8<s  
//{{AFX_MSG_MAP(CCaptureDlg) ~}9H<K3V  
 ON_WM_SYSCOMMAND() KV&_^xSoh|  
 ON_WM_PAINT() v lnUN  
 ON_WM_QUERYDRAGICON() $;j6 *,H  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VDI S`E  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >IydXmTy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Spw=+z<<Ub  
//}}AFX_MSG_MAP |Btx&'m  
END_MESSAGE_MAP() Q~8&pP8 I!  
Env}gCX  
BOOL CCaptureDlg::OnInitDialog() a9q?9X  
{  C(Gb  
 CDialog::OnInitDialog(); T/.y(8!0I8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ra#)*fG,~  
 ASSERT(IDM_ABOUTBOX < 0xF000); aNf3 R;*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); n7YWc5:CaL  
 if (pSysMenu != NULL) OG$iZiuf  
 { E$zq8-p|  
  CString strAboutMenu; {(:)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .`8,$"`4)  
  if (!strAboutMenu.IsEmpty()) ?g1 .-'  
  { DB= cc  
   pSysMenu->AppendMenu(MF_SEPARATOR); #3ro?w  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); nf@u7*# 6  
  } M/`z;a=EP  
 } gJfL$S'w  
 SetIcon(m_hIcon, TRUE); // Set big icon 8Nq Iz  
 SetIcon(m_hIcon, FALSE); // Set small icon K OHH74}_  
 m_Key.SetCurSel(0); {mr)n3  
 RegisterHotkey(); JM4`k8mM  
 CMenu* pMenu=GetSystemMenu(FALSE); )C0X]?   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  l e/#J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?d`+vHK]>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Vt2=rD4oJk  
 return TRUE; // return TRUE unless you set the focus to a control AS-t][m#  
} XA^:n+Yo  
X#C7r@H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X{5DPhB,  
{ $GK m`I"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) e<wj5:M|  
 { dM$G)9N)K  
  CAboutDlg dlgAbout; /XK`v=~(l{  
  dlgAbout.DoModal(); w!k4&Rb3  
 } J0 z0%p   
 else ">^]^wa08  
 { >~8Df61o`  
  CDialog::OnSysCommand(nID, lParam); b4OR`dd*J  
 } 31\^9w__8  
} I*ni)Px  
rKO*A7vE  
void CCaptureDlg::OnPaint() %QZ!Tb  
{ <"P '"SC  
 if (IsIconic()) S; <?nz3  
 { 3@bjIX`=H  
  CPaintDC dc(this); // device context for painting ]xeyXw84k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \ } Szb2  
  // Center icon in client rectangle 85~h+Q;  
  int cxIcon = GetSystemMetrics(SM_CXICON); zt%Fvn4/pF  
  int cyIcon = GetSystemMetrics(SM_CYICON); [gY__  
  CRect rect; UR=s{nFd  
  GetClientRect(&rect); 'GoeVq  
  int x = (rect.Width() - cxIcon + 1) / 2; *N+aZV}`Z  
  int y = (rect.Height() - cyIcon + 1) / 2; q%&7J<   
  // Draw the icon c324@o^V  
  dc.DrawIcon(x, y, m_hIcon); [|Pe'?zkf  
 } W,J,h6{F  
 else k.Nu(j"z  
 { i^KYZ4/%  
  CDialog::OnPaint(); %dR./{txT  
 } wLSYzz  
} -$ft `Ih  
[\F,\  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ox'.sq4  
{ ?LFSR  
 return (HCURSOR) m_hIcon; <LZvh8  
} @ ]3Rw[% z  
z1 px^#  
void CCaptureDlg::OnCancel() LK5H~FK  
{ a];g  
 if(bTray) :*nBo  
  DeleteIcon(); K)@Buu&,p  
  CDialog::OnCancel(); tAi9mm;k  
} X*q C:]e  
R/YL1s  
void CCaptureDlg::OnAbout() 3?(p;  
{ !AHm+C_=Lg  
 CAboutDlg dlg; /Q_\h+ `  
 dlg.DoModal(); nd1*e  
} ,~iAoxD5jY  
0GVok$r@  
void CCaptureDlg::OnBrowse() f}!26[_9{  
{ t"Hrn3w  
 CString str; rT)R*3  
 BROWSEINFO bi; 'E,Yht=/}  
 char name[MAX_PATH]; r8.v0b"1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \LXC269  
 bi.hwndOwner=GetSafeHwnd(); i% lB U 1  
 bi.pszDisplayName=name; qm8RRDG  
 bi.lpszTitle="Select folder"; d2C:3-4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d(Ou\7  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); UQ~rVUo.c  
 if(idl==NULL) =h;!#ZC  
  return; t}gqk'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R<Tzt' z  
 str.ReleaseBuffer(); bb/MnhB  
 m_Path=str; A'EA!  
 if(str.GetAt(str.GetLength()-1)!='\\')  :i$Z  
  m_Path+="\\"; Fgk/Ph3r  
 UpdateData(FALSE); %"2B1^o>  
} lhTbgM  
_F E F+I  
void CCaptureDlg::SaveBmp() $)~]4n=  
{ x6tY _lzJ  
 CDC dc; ]H[\~J  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N-]n>E  
 CBitmap bm; N';lc:Ah~  
 int Width=GetSystemMetrics(SM_CXSCREEN); B)dynGF8i  
 int Height=GetSystemMetrics(SM_CYSCREEN); m`"s$\fah  
 bm.CreateCompatibleBitmap(&dc,Width,Height); KA#-X2U/  
 CDC tdc; Hkt'~ L*   
 tdc.CreateCompatibleDC(&dc); ]0le=Ee^%  
 CBitmap*pOld=tdc.SelectObject(&bm); +s}28U!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); E>D@#I>  
 tdc.SelectObject(pOld); swA"_A8>u  
 BITMAP btm; rl=_ "sd=  
 bm.GetBitmap(&btm); @~ L.m}GF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Y."[k&P-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ja2]VbB  
 BITMAPINFOHEADER bih; k5YDqG n'q  
 bih.biBitCount=btm.bmBitsPixel; W=m_G]"L  
 bih.biClrImportant=0; Fu/CX4R_|  
 bih.biClrUsed=0; ;|y,bo@sJJ  
 bih.biCompression=0; =qvU9p2o  
 bih.biHeight=btm.bmHeight; z wW9>Y  
 bih.biPlanes=1; Z}wAh|N-  
 bih.biSize=sizeof(BITMAPINFOHEADER); VJaL$Wv)H  
 bih.biSizeImage=size; \zwb>^  
 bih.biWidth=btm.bmWidth; L\[jafb_`  
 bih.biXPelsPerMeter=0; MC@cT^Z^  
 bih.biYPelsPerMeter=0; O 7sn>uO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); AF-.Nwp   
 static int filecount=0; R YNz TA  
 CString name; &Te:l-x  
 name.Format("pict%04d.bmp",filecount++); Y# #J  
 name=m_Path+name; ~Zm(p*\T  
 BITMAPFILEHEADER bfh; 4`F*] Ft  
 bfh.bfReserved1=bfh.bfReserved2=0; V2.K*CpZ7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #p >PNW-  
 bfh.bfSize=54+size; 5UbVg  
 bfh.bfOffBits=54; ceCshxTU  
 CFile bf; %XeU4yg\e  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .YkKIei  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >Z%^|S9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :xV&%Qa1  
  bf.WriteHuge(lpData,size); 4 #N#[;M  
  bf.Close();  lzuZv$K  
  nCount++; HChewrUAn  
 } 7d*<'k]{,  
 GlobalFreePtr(lpData); s7?kU3 y=s  
 if(nCount==1) ~6nQ-  
  m_Number.Format("%d picture captured.",nCount); N_0O"" d  
 else GZw<Y+/V"5  
  m_Number.Format("%d pictures captured.",nCount); wkGF&U  
  UpdateData(FALSE); 4 C:YEX~  
} Q8n?7JB  
^9nM)[/C?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2,\u Y}4  
{ &g`a [#  
 if(pMsg -> message == WM_KEYDOWN) pqK3u)  
 { u$"5SGI6  
  if(pMsg -> wParam == VK_ESCAPE) s"/8h#!zv  
   return TRUE; eD3F%wxz  
  if(pMsg -> wParam == VK_RETURN) gyK"#-/_d  
   return TRUE; K*<n<;W  
 } 9=SZL~#CE  
 return CDialog::PreTranslateMessage(pMsg); [xC (t]S-  
} L{ -w9(S`i  
<5q}j-Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ou%>Dd5|?  
{ bCF63(0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a srkuAS  
  SaveBmp(); 4$^=1ax  
  return FALSE; K02./ut-  
} 3,?y !  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ saV` -#  
 CMenu pop; /dqKFxB1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));  P/Z o  
 CMenu*pMenu=pop.GetSubMenu(0); 6 D O E6  
 pMenu->SetDefaultItem(ID_EXITICON); BzZy s  
 CPoint pt; *;m721#  
 GetCursorPos(&pt); 'e)t+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); m3D'7*U  
 if(id==ID_EXITICON) [D)A+  
  DeleteIcon(); d2Y5'A0X  
 else if(id==ID_EXIT) a AuQw  
  OnCancel(); !ZVMx*1Cf  
 return FALSE; Y5 dt?a  
} r0sd_@Oj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M3V[p9>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }Z6/b _kV  
 AddIcon(); ^o 5q- ;a  
 return res; pkoHi'}}$  
} ^:],JN k  
P7o6B,9  
void CCaptureDlg::AddIcon() F ;D_zo?  
{ 38#(ruv  
 NOTIFYICONDATA data; mf3G$=[  
 data.cbSize=sizeof(NOTIFYICONDATA); LP~$7a  
 CString tip; Rq 7ksTo  
 tip.LoadString(IDS_ICONTIP); "hvw2lyp3  
 data.hIcon=GetIcon(0); ZFzOW  
 data.hWnd=GetSafeHwnd(); Czp:y8YX-  
 strcpy(data.szTip,tip); uxcj3xE#d  
 data.uCallbackMessage=IDM_SHELL; !qR(Rn  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0KZ 3h|4lP  
 data.uID=98; ?tcbiXRG+  
 Shell_NotifyIcon(NIM_ADD,&data); /sai}r 1  
 ShowWindow(SW_HIDE); \rJk[Kec  
 bTray=TRUE; ZjcJYtD  
} S("bN{7nE  
& mWq'h  
void CCaptureDlg::DeleteIcon() YS]RG/'  
{ DlP}Fp{  
 NOTIFYICONDATA data; 4-m%[D |W  
 data.cbSize=sizeof(NOTIFYICONDATA); *<@  
 data.hWnd=GetSafeHwnd(); `/U:u9H9v  
 data.uID=98; Gc'H F"w  
 Shell_NotifyIcon(NIM_DELETE,&data); !cpBX>{w  
 ShowWindow(SW_SHOW); >|s=l`"Xz  
 SetForegroundWindow(); j@DyWm/7  
 ShowWindow(SW_SHOWNORMAL); |J\/U,nh  
 bTray=FALSE; B}(YD;7vJ  
} FD*y[A ?  
=k_u5@.Z  
void CCaptureDlg::OnChange() K!9=e7|P  
{ m$^7sFD$  
 RegisterHotkey(); '>6-ie^0  
} IFgF5VG6g  
, ^nUi c  
BOOL CCaptureDlg::RegisterHotkey() S `[8TZ  
{ aX|`G]PhdI  
 UpdateData(); _)|!.r&)63  
 UCHAR mask=0; ?Cws25G  
 UCHAR key=0; $5A XE;~{  
 if(m_bControl) vfjIpg%i  
  mask|=4; ]X5*e'  
 if(m_bAlt) +bSv-i-  
  mask|=2; n33SWE(  
 if(m_bShift) {ys_uS{c*  
  mask|=1; kO.rgW82  
  key=Key_Table[m_Key.GetCurSel()]; ._yr7uY[M  
 if(bRegistered){ 0Zq" -  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); uYl ?Q  
  bRegistered=FALSE; My ^pQ]@  
 } ^v},Sa/ot]  
 cMask=mask; z}&<D YD  
 cKey=key; eQc!@*:8U  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'W#<8eJo  
 return bRegistered; l]ZUKy  
} }Yj S v^  
0L6L_;o  
  四、小结 <7zpHSFBq  
V_~wWuZ-  
  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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