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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: -A\J:2a|  
  Q.dHg7+D  
  一、实现方法 5X'com?T  
DW,fh8w  
  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: A)X 'We  
o3mxtE]  
#pragma data_seg("shareddata") luEP5l2&  
HHOOK hHook =NULL; //钩子句柄 KT5"/fv  
UINT nHookCount =0; //挂接的程序数目  9kkYD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 09RJc3XE9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~ 3HI;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey sT^^#$ub  
static int KeyCount =0; wJb\Q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1HBdIWhHv.  
#pragma data_seg() 4/rd r80  
#&hu-gMV  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 l*l(QvN_  
~TGk`cAM>  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: N8Mq0Ck{$  
@Lj28&4:<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k?Bc^7l:  
cKey,UCHAR cMask)  ?2g\y@  
{ ` _+j+  
 BOOL bAdded=FALSE; L%7?o:  
 for(int index=0;index<MAX_KEY;index++){ kdWk{ZT^  
  if(hCallWnd[index]==0){ 9 J$z/j;X  
   hCallWnd[index]=hWnd; U =()T}b>  
   HotKey[index]=cKey; {FavF 9O  
   HotKeyMask[index]=cMask; qP"<vZ  
   bAdded=TRUE; 8-HMKD#V  
   KeyCount++; C7]K9  
   break; Ve4!MM@ti  
  } 8^H <dR  
 } tXocGM {6C  
 return bAdded; 4YVxRZ1[3  
} (> v1)*r  
//删除热键 >,8DwNuq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 27;t,Oq}  
{ !50Fue^JM  
 BOOL bRemoved=FALSE; S> f8j?n  
 for(int index=0;index<MAX_KEY;index++){ C#5z!z/:%  
  if(hCallWnd[index]==hWnd){ ~6nq$(#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kpkN GQ2  
    hCallWnd[index]=NULL; V9 pKb X  
    HotKey[index]=0; && }'  
    HotKeyMask[index]=0; &}1PH% 6  
    bRemoved=TRUE; #du!tx ( _  
    KeyCount--; 6 ]@H.8+  
    break; Ny;(1N|&3  
   } c%uX+\-$  
  } y@|gG&f T  
 } .1yp}&e#  
 return bRemoved; /=x) 9J  
} s!q6OVJ-  
Ksq{=q-T  
xQ `>\f  
  DLL中的钩子函数如下: zkdyfl5  
:bLLN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xj/ +Z!,9  
{ D]9I-|  
 BOOL bProcessed=FALSE; uvK1gJrA)  
 if(HC_ACTION==nCode) !\a'GO[  
 { Cwxy ~.mI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 F6gboo)SD  
   switch(wParam) RZ!-,|"cwL  
   {  21$YZlhJ  
    case VK_MENU: hsVf/%  
     MaskBits&=~ALTBIT; ;}b.gpG  
     break; 9PA\Eo|Yb  
    case VK_CONTROL: /q4<ZS#  
     MaskBits&=~CTRLBIT; fA u^%jiU  
     break; _MfB,CS  
    case VK_SHIFT: H|4O`I;~(  
     MaskBits&=~SHIFTBIT; Tp.0@aC  
     break; Uhc2`r#q  
    default: //judge the key and send message -{i;!XE$SR  
     break; @N`) Z3P+  
   } Y"&&=M#  
   for(int index=0;index<MAX_KEY;index++){ QvK-3w;=  
    if(hCallWnd[index]==NULL) vMsb@@O\\  
     continue; ">}l8MA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (gQ^jmZPG  
    { Kb~s'cTxIO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )+c4n]  
     bProcessed=TRUE; hL#5:~(  
    } Gb6t`dSzz  
   } 48CLnyYiF  
  } `}ak;^Me  
  else if((lParam&0xc000ffff)==1){ //有键按下 7z'l}*FRD  
   switch(wParam) PsTPGK#S  
   { 9FT;?~,  
    case VK_MENU: oHkF>B [  
     MaskBits|=ALTBIT; vgSs]g  
     break; )6#dxb9  
    case VK_CONTROL: TC1#2nE&T  
     MaskBits|=CTRLBIT; [ Y_6PR  
     break; |:SBkM,  
    case VK_SHIFT: W$7db%qFx  
     MaskBits|=SHIFTBIT; OPR+K ?  
     break; jk2h"):B>  
    default: //judge the key and send message . KJ EA #  
     break; 5|!x0H;  
   } UXVjRY`M.\  
   for(int index=0;index<MAX_KEY;index++){ M7 &u_Cn?  
    if(hCallWnd[index]==NULL) &B\tcF  
     continue; EOu\7;kE9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h V@C|*A  
    { o0b}:`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >cEc##:5  
     bProcessed=TRUE; RwMK%^b  
    } AAjsb<P  
   } B5>h@p-UV  
  } $E@L{5Yt  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \x i wp.  
   for(int index=0;index<MAX_KEY;index++){ ooY2"\o  
    if(hCallWnd[index]==NULL) K^bzZa+a  
     continue; _4iTP$7[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bE _=L=NG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #/zPAcV:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ml)~%ZbF  
   } OI"vC1.5  
  } <:)T7yVq  
 } pIdJ+gu(s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $e#p -z  
} R4G$!6Ld  
[$)C(1zY  
  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: fyIL/7hzf4  
D4[1CQ@}4D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); elCDPZTf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lj $\2 B  
i,NU%be  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: /%Lj$]S7[4  
Z.+-MNWV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WmTSxneo  
{ (KR$PLxDK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) es@_6ol.@  
 { u"r~5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \D(6t!Ox  
  SaveBmp(); PLR[nB7K  
  return FALSE; RWtD81(oC'  
 } ]5W0zNb*  
 …… //其它处理及默认处理 a9PSg/p  
} PV vNu5k  
Bsi HVr  
Wf/Gt\?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 &gxRw l  
#4"(M9kf  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 2C^/;z  
Q{6Bhx *>  
  二、编程步骤 P]:r'^Yn  
<CIJ g*  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; mw%do&e  
YKq,`7"%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; v 0mc1g+9  
>oi`%V  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; =zBcfFii`w  
8<ZxE(v  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; }I<r=?  
(3YCe{  
  5、 添加代码,编译运行程序。 6KPM4#61o  
nPh 5(&E  
三、程序代码 pMM,ox"  
BYuF$[3ya&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Xwy0dXko  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V8ka*VJ(B  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ j#d=V@=a  
#if _MSC_VER > 1000 vcs=!Ace  
#pragma once GlYNC&,VL  
#endif // _MSC_VER > 1000 x>vC;E${"  
#ifndef __AFXWIN_H__ 9,\b$?9  
#error include 'stdafx.h' before including this file for PCH d:*,HzG  
#endif R=P=?U.  
#include "resource.h" // main symbols tcyami6D4  
class CHookApp : public CWinApp 5Z/xY &  
{ 7K3S\oPej  
 public: 4E]w4BG)  
  CHookApp(); 1o\P7P Le  
  // Overrides >aXyi3B  
  // ClassWizard generated virtual function overrides U 2am1}  
  //{{AFX_VIRTUAL(CHookApp) 8enlF\I8g  
 public:  (`PgvBL:  
  virtual BOOL InitInstance();  4b]/2H  
  virtual int ExitInstance(); i356m9j  
  //}}AFX_VIRTUAL 9}4P%>_  
  //{{AFX_MSG(CHookApp) mne4uW  
  // NOTE - the ClassWizard will add and remove member functions here. `Yn:fL7S  
  // DO NOT EDIT what you see in these blocks of generated code ! |kJ'FZZd  
  //}}AFX_MSG 8A/"ia  
  DECLARE_MESSAGE_MAP() 6Mu_9UAl`  
}; RGFanP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;0DT f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0dxEV]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q qGf*  
BOOL InitHotkey(); S]&f+g}&w  
BOOL UnInit(); o))z8n?b  
#endif 8qGK"%{ ~  
1!_$HA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P{j2'gg3  
#include "stdafx.h" A\p'\@f  
#include "hook.h" ,:POo^!/fT  
#include <windowsx.h> xl [3*K   
#ifdef _DEBUG E~vM$$O$  
#define new DEBUG_NEW ;hb;%<xqT  
#undef THIS_FILE _b8&$\>  
static char THIS_FILE[] = __FILE__; Ji4xor  
#endif jp=z ^l  
#define MAX_KEY 100 2"+8NfFl  
#define CTRLBIT 0x04 4po zTe  
#define ALTBIT 0x02 q5C(/@)^  
#define SHIFTBIT 0x01 FG/".dU  
#pragma data_seg("shareddata") ^o&3+s} M  
HHOOK hHook =NULL; &?N1-?BjM  
UINT nHookCount =0; R-8>,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey pu#h:nb>88  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ZlQ@k{Es~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~ 8L]!OQ9=  
static int KeyCount =0; kI7c22OJ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "B`k  
#pragma data_seg()  `{w.OK  
HINSTANCE hins; 2;h4$^`dt  
void VerifyWindow(); q?} /q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |R$V[  
//{{AFX_MSG_MAP(CHookApp) .j"iJ/  
// NOTE - the ClassWizard will add and remove mapping macros here. .Z%y16)T  
// DO NOT EDIT what you see in these blocks of generated code! P^9y0Q  
//}}AFX_MSG_MAP x!5b" "  
END_MESSAGE_MAP() oz3N 8^M  
yOR]r+8  
CHookApp::CHookApp() sa8JN.B  
{ $ 9bIUJ  
 // TODO: add construction code here, "#zSk=52z  
 // Place all significant initialization in InitInstance ?VCdT`6=  
} sG-$d\ 1d  
<Y%km[Mh  
CHookApp theApp; {"{kWbXZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "&h{+DHS  
{ '-9B`O,&  
 BOOL bProcessed=FALSE; [+ ,%T;d;  
 if(HC_ACTION==nCode) - Q3jK)1  
 { 0"l*8%g  
  if((lParam&0xc0000000)==0xc0000000){// Key up oDz%K?29%  
   switch(wParam) O^|:q  
   { {qxFRi#\k  
    case VK_MENU: j v9DQr  
     MaskBits&=~ALTBIT; Pw c)u&  
     break; 9$ GA s  
    case VK_CONTROL: |,YyuCQcL[  
     MaskBits&=~CTRLBIT; C8ss6+k&  
     break; `FS)i7-o6  
    case VK_SHIFT: $D;/b+a  
     MaskBits&=~SHIFTBIT; #63)I9>  
     break; <'(O0  
    default: //judge the key and send message LPuc&8lGWf  
     break; w3,DsEXu  
   } KWuc*!  
   for(int index=0;index<MAX_KEY;index++){ ~>2DA$Ec  
    if(hCallWnd[index]==NULL) [[vu#'bc  
     continue; {7EnM1]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NT(gXEZ  
    { }jL_/gvgy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $a / jfpV  
     bProcessed=TRUE; D,$!.5OA  
    } r0MUv}p#|L  
   } ~vL7$-:  
  } 0EWov~Y?  
  else if((lParam&0xc000ffff)==1){ //Key down o 8fB  
   switch(wParam) R\i8O^[  
   { !u)>XS^E  
    case VK_MENU: SynL%Y9)|,  
     MaskBits|=ALTBIT; He&7(mQ0^  
     break; U2hPsF4f  
    case VK_CONTROL: 4?eO1=a  
     MaskBits|=CTRLBIT; 0cGO*G2Xr  
     break; tccw0  
    case VK_SHIFT: W#|30RU.G  
     MaskBits|=SHIFTBIT; [nSlkl   
     break; >JSk/]"  
    default: //judge the key and send message  5yA1<&z  
     break; )># Y,/q  
   } v8{ jEAK  
   for(int index=0;index<MAX_KEY;index++) So6ZNh9  
   { DHI%R<  
    if(hCallWnd[index]==NULL) +ConK>;  
     continue; a9f!f %9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) to2#PXf]y  
    { aLo^f= S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CIt%7 \c  
     bProcessed=TRUE; ?cyBF*o  
    } r%:Q(|v?  
   } 6H ]rO3[8  
  } 2`Dqu"TWh  
  if(!bProcessed){ U{`Q_Uw@$:  
   for(int index=0;index<MAX_KEY;index++){ HpXQ D;  
    if(hCallWnd[index]==NULL) " Y1]6 Zu  
     continue; k vu SE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^i"~6QYE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bmid;X|  
   } !^Ly#$-X  
  } <2.87:  
 } {M_*hR;lL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q  *]d[  
} `F(ghC  
L2 ybL#dz  
BOOL InitHotkey() x$SxGc~4gb  
{ uc~/l4~N  
 if(hHook!=NULL){ z+5ZUS2~&  
  nHookCount++; `GpOS_;  
  return TRUE; 23(j<  
 } ;h"St0   
 else qH=<8Iu  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y3 V9  
  if(hHook!=NULL) 0[ BPmO6  
   nHookCount++; sC}p_'L  
  return (hHook!=NULL); !T|q/ri  
} prdc}~J8{  
BOOL UnInit() @CB&*VoB  
{ i"_@iN0N  
 if(nHookCount>1){ vyA `Z1  
  nHookCount--; E2nsBP=5C  
  return TRUE; + g*s%^(E  
 } 2=%R>&]*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); AY(z9 &;6  
 if(unhooked==TRUE){ L ,/(^0;  
  nHookCount=0; ,_iR  
  hHook=NULL; ! N!A%  
 } ;1MRBk,  
 return unhooked; K2o\+t  
} 6rll0c~  
} \?]uNH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q}+Fm?B   
{ V4CL% i  
 BOOL bAdded=FALSE; MXP3Z N'  
 for(int index=0;index<MAX_KEY;index++){ v1`*}.#  
  if(hCallWnd[index]==0){ {Q(R#$)5+  
   hCallWnd[index]=hWnd; 1w$X;q"  
   HotKey[index]=cKey; -}G>{5.A  
   HotKeyMask[index]=cMask; +M{A4nYY|1  
   bAdded=TRUE; #wS/QrRE  
   KeyCount++; g;eoH  
   break; R^f-j-$o]  
  } [dIlt"2fV  
 } 0_f6Qrcj  
 return bAdded; N]dsGvX  
} W }  
3$n O@rOS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6mml96(  
{ Ls2g#+  
 BOOL bRemoved=FALSE; ]w5j?h"b  
 for(int index=0;index<MAX_KEY;index++){ sKniqWi  
  if(hCallWnd[index]==hWnd){ KM9)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "V3f"J?  
    hCallWnd[index]=NULL; ]m=2 $mK  
    HotKey[index]=0; -R BH5+SS2  
    HotKeyMask[index]=0; ;56mkP  
    bRemoved=TRUE; M@a=|N~  
    KeyCount--; OaF[t*]D3  
    break; :YUQKy  
   } :(TOtrK@  
  } LQ{z}Ay  
 } /DxeG'O  
 return bRemoved; "eH.<&  
} )2&y;{]  
@#1T-*  
void VerifyWindow() d#cEAy  
{ Y q(CD!  
 for(int i=0;i<MAX_KEY;i++){ \wb0%> 0  
  if(hCallWnd!=NULL){ }HLV'^"k  
   if(!IsWindow(hCallWnd)){ d3&l!DoX  
    hCallWnd=NULL; 9~|hGo  
    HotKey=0; zcCGR Ee=  
    HotKeyMask=0; ( SiwO.TZ  
    KeyCount--; $/|2d4O:{  
   } c W^  
  } |S.;']t+  
 } BW{&A&j  
} h/xV;oj  
?Vo/mtbY5X  
BOOL CHookApp::InitInstance() k3VRa|Y")  
{ z$b'y;k  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T(q/$p&q  
 hins=AfxGetInstanceHandle(); iT,Ya-9"  
 InitHotkey(); 4&}dA^F  
 return CWinApp::InitInstance(); e;r?g67  
} )D8V;g(7F  
Yu e#  
int CHookApp::ExitInstance() 4VI'd|Ed  
{ ~`!{5:v  
 VerifyWindow(); D]*<J"/]d  
 UnInit(); CU_8 `}  
 return CWinApp::ExitInstance(); 4) z*Vux  
} /;V:<mekf  
dA[S@ysvG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a8v9j3.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v7#`b}'W  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O]-s(8Oo3  
#if _MSC_VER > 1000 _2wH4^Vb  
#pragma once =BVBCh  
#endif // _MSC_VER > 1000 [`_-;/Gx2  
6[S-%|f  
class CCaptureDlg : public CDialog Og/@w&  
{ y8/+kn +  
 // Construction *jrQ-'<T  
 public: JzZ@Z8%a;  
  BOOL bTray; BU=;rz!;  
  BOOL bRegistered; ' "I-! +  
  BOOL RegisterHotkey();  zPW_  
  UCHAR cKey; ~F^7L5d}C  
  UCHAR cMask; "S^ ""5  
  void DeleteIcon(); 6sz:rv}  
  void AddIcon(); OTV$8{  
  UINT nCount; XyrQJ}WR|  
  void SaveBmp(); CoTe$C7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor w+G+&ak<  
  // Dialog Data rlP?Uh  
  //{{AFX_DATA(CCaptureDlg) Lf0Wc'9{  
  enum { IDD = IDD_CAPTURE_DIALOG }; zOsk'ZE&  
  CComboBox m_Key; j=y{ey7Fd  
  BOOL m_bControl; ;^9y#muk  
  BOOL m_bAlt; {qbx iL-  
  BOOL m_bShift; q-R'5p\C?|  
  CString m_Path; "fZWAGDBO\  
  CString m_Number; ~%Xs"R1c ,  
  //}}AFX_DATA ,); -v4$  
  // ClassWizard generated virtual function overrides O]%Vh l  
  //{{AFX_VIRTUAL(CCaptureDlg) AH'4k(-  
 public: L1u(\zw  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %Q y9X+N:  
 protected: [a!*m<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MVXy)9q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3JXKp k?   
  //}}AFX_VIRTUAL KreF\M%Ke  
  // Implementation }&Kl)2:O  
 protected: U?&&yynK  
  HICON m_hIcon; .V.ga2+  
  // Generated message map functions m'YYkq(5%Z  
  //{{AFX_MSG(CCaptureDlg) oa2v/P1`  
  virtual BOOL OnInitDialog(); hjx= ?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ' i<}/l  
  afx_msg void OnPaint(); 6hAMk<kx?i  
  afx_msg HCURSOR OnQueryDragIcon(); @8"cT-  
  virtual void OnCancel(); -I*NS6  
  afx_msg void OnAbout(); g ^4<ve  
  afx_msg void OnBrowse(); *Y<1KXFU  
  afx_msg void OnChange(); WR5W0!'Tf  
 //}}AFX_MSG }4XXNYH  
 DECLARE_MESSAGE_MAP() *wu|(t_ A  
}; Eq6. s)10  
#endif 1YJ@9*l  
q~G@S2=}0}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \z[L=  
#include "stdafx.h" SnFAv7_  
#include "Capture.h" <0!)}O  
#include "CaptureDlg.h" ZP;WXB`  
#include <windowsx.h> qY$]^gS  
#pragma comment(lib,"hook.lib") J*m ~fZ^  
#ifdef _DEBUG 5~\GAjf  
#define new DEBUG_NEW ]o2 Z 14  
#undef THIS_FILE JxLSQ-"  
static char THIS_FILE[] = __FILE__; H:!pFj  
#endif >v1ajI>O&{  
#define IDM_SHELL WM_USER+1 t# <(Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |tdsg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +MvO+\/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |$ &v)  
class CAboutDlg : public CDialog E0aJ~A(Hv  
{ qJYEsI2M  
 public: h7cE"m  
  CAboutDlg(); -cL wjI  
  // Dialog Data *@zya9y9q  
  //{{AFX_DATA(CAboutDlg) zIy&gOX  
  enum { IDD = IDD_ABOUTBOX }; ,pR.HCR#Y  
  //}}AFX_DATA .kZ<Q]Vk  
  // ClassWizard generated virtual function overrides |P(8T'  
  //{{AFX_VIRTUAL(CAboutDlg) uL9O_a;!  
 protected: `&5_~4T7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C[Nh>V7=  
  //}}AFX_VIRTUAL Fd1jElt  
  // Implementation  MKZq*  
 protected: A? T25<}  
  //{{AFX_MSG(CAboutDlg) [[' (,,r  
  //}}AFX_MSG 9 gWqs'  
  DECLARE_MESSAGE_MAP() 0W!S.]^1  
}; MoMxKmI  
S9lT4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hd~0qK  
{ 4'GosQ85  
 //{{AFX_DATA_INIT(CAboutDlg) v#b(0G  
 //}}AFX_DATA_INIT H rI(uZ]  
} lOu&4Kq{g  
+ 3c (CTz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yLEA bd%+  
{  re@;6o  
 CDialog::DoDataExchange(pDX); `*w!S8}m;  
 //{{AFX_DATA_MAP(CAboutDlg) _l{_n2D-  
 //}}AFX_DATA_MAP NEff`mwm5)  
} G}#p4 \/  
]Pf!wv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )kvrQ6  
 //{{AFX_MSG_MAP(CAboutDlg) RLR\*dL1  
 // No message handlers MD>xRs   
 //}}AFX_MSG_MAP KU 98"b5  
END_MESSAGE_MAP() ?eOw8Rom  
WWN2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]qO*(m:}o  
: CDialog(CCaptureDlg::IDD, pParent) [,Fu2j]  
{ Y?xc#'  
 //{{AFX_DATA_INIT(CCaptureDlg) xy+hrbD)j  
  m_bControl = FALSE; 't'2z  
  m_bAlt = FALSE; K-4o_:F  
  m_bShift = FALSE; RKD$'UWX  
  m_Path = _T("c:\\"); e1Bqd+  
  m_Number = _T("0 picture captured."); |^C35 6M>  
  nCount=0; Fr)6<9%xVm  
  bRegistered=FALSE; #@}wl  
  bTray=FALSE; :YM1p&|fS  
 //}}AFX_DATA_INIT k293 wS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !;E{D  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Dgm"1+  
} 3h**y %^  
@|d+T"f  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ChRCsu~  
{ rH9[x8e  
 CDialog::DoDataExchange(pDX); *s$:"g-  
 //{{AFX_DATA_MAP(CCaptureDlg) UqNUP+K  
  DDX_Control(pDX, IDC_KEY, m_Key); Nc:0opPM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qv)%)n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b{a\j%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5~{s-Ms  
  DDX_Text(pDX, IDC_PATH, m_Path); e~PAi8B5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); kS< 9cy[O  
 //}}AFX_DATA_MAP ,nSapmg  
} sDP8!  
XU6SYC"t%~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8]&\FA8  
//{{AFX_MSG_MAP(CCaptureDlg) g96]>]A<{  
 ON_WM_SYSCOMMAND() r Fhi:uRV  
 ON_WM_PAINT() <~n%=^knE  
 ON_WM_QUERYDRAGICON() W3w$nV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H-t"Z}  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,$bK)|pGV  
 ON_BN_CLICKED(ID_CHANGE, OnChange) UAOH9*9*  
//}}AFX_MSG_MAP l^R1XBP  
END_MESSAGE_MAP()  |Fe*t  
Esdw^MGL2  
BOOL CCaptureDlg::OnInitDialog() cS RmC  
{ n7pjj  
 CDialog::OnInitDialog(); o?S!o}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?b xa k  
 ASSERT(IDM_ABOUTBOX < 0xF000); ca,U>'(y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); w:/QB-`%  
 if (pSysMenu != NULL) s_cur-  
 { E^? 3P'%^  
  CString strAboutMenu; X1o=rT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); =O>E>Q  
  if (!strAboutMenu.IsEmpty()) {~EPP .  
  { `gz/?q  
   pSysMenu->AppendMenu(MF_SEPARATOR); qL~|bfN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7uq^TO>9f  
  } 5U6b\jxX  
 } E(Zm6~  
 SetIcon(m_hIcon, TRUE); // Set big icon zj 2l&)N  
 SetIcon(m_hIcon, FALSE); // Set small icon wW|[Im&  
 m_Key.SetCurSel(0); VvTi>2(.  
 RegisterHotkey(); &;[e  
 CMenu* pMenu=GetSystemMenu(FALSE); zR5KC!xc  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .x][ _I>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); U:uF rb,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v)<|@TD)  
 return TRUE; // return TRUE unless you set the focus to a control )wCV]TdF  
} r=S,/N(1  
'Xu3]'m*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) s^HI%mdf  
{ Y7<(_p7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $lb$<  
 { KN".0WU  
  CAboutDlg dlgAbout; 2X6L'!=  
  dlgAbout.DoModal();  I}u&iV`  
 } qv3% v3\4  
 else <\oD4EE_  
 { m-lTXA(  
  CDialog::OnSysCommand(nID, lParam); U3BhoD#f\  
 } IC+!XZqS  
} fT.MglJcb  
J*t_r-z  
void CCaptureDlg::OnPaint() rY295Q  
{ UeU`U  
 if (IsIconic()) 6rMNp"!  
 { c+501's  
  CPaintDC dc(this); // device context for painting ["sm7yQ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9*2^2GR^;  
  // Center icon in client rectangle G{gc]7\=Cd  
  int cxIcon = GetSystemMetrics(SM_CXICON); f0+vk'Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); mb*|$ysPx  
  CRect rect; \e~5Dx1  
  GetClientRect(&rect); a;=IOQ  
  int x = (rect.Width() - cxIcon + 1) / 2; i9D<jkc  
  int y = (rect.Height() - cyIcon + 1) / 2; tv%B=E!r  
  // Draw the icon </D )i  
  dc.DrawIcon(x, y, m_hIcon); m^>v~Q~~  
 } czT]XF  
 else lPw`KW  
 { xc,Wm/[  
  CDialog::OnPaint(); 75;g|+  
 } 6 tl#AJ-  
} HNd? '  
]E^)d|_  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3,1HD_  
{ `o?PLE;)p  
 return (HCURSOR) m_hIcon; |z?c>.  
} j7~Rw"(XQc  
X=V2^zrt  
void CCaptureDlg::OnCancel() Y6m:d&p=}  
{ \i3)/sZ?l  
 if(bTray) #wp~lW9!s9  
  DeleteIcon(); R p0^Gwa  
  CDialog::OnCancel(); GK1oS  
} V/BU(`~i  
avW33owb@  
void CCaptureDlg::OnAbout() g0#w 4rGF)  
{ fWyXy%Qq  
 CAboutDlg dlg; L| ;WE=  
 dlg.DoModal(); TT={>R[B  
} gv,1 CK  
sQn@:Gk  
void CCaptureDlg::OnBrowse() 6pbtE]  
{ "-S@R=bi  
 CString str; J~AmRo0!k  
 BROWSEINFO bi; A45!hhf  
 char name[MAX_PATH];  %e(DPX  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5,?^SK|'x  
 bi.hwndOwner=GetSafeHwnd(); Q9i[?=F:z  
 bi.pszDisplayName=name; q4Mv2SPT  
 bi.lpszTitle="Select folder"; Uh+6fE]p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \- 8aTF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); WZ=$c]gG  
 if(idl==NULL) %Z*N /nU  
  return; ~ 1~|/WG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |)S*RQb\  
 str.ReleaseBuffer(); b4 Pa5 w  
 m_Path=str; g]E3+:5dk  
 if(str.GetAt(str.GetLength()-1)!='\\') ?_eHvw  
  m_Path+="\\"; <GLn!~Px@5  
 UpdateData(FALSE); 6zI}?KZf  
} gBOF#"-  
nPk&/H%5hn  
void CCaptureDlg::SaveBmp() +[}<u--  
{ e xkPu-[W  
 CDC dc; 4hzdc ] a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); qB3E  
 CBitmap bm; $g),|[ x+(  
 int Width=GetSystemMetrics(SM_CXSCREEN); [_: GQ  
 int Height=GetSystemMetrics(SM_CYSCREEN); Nh\o39=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L_o/fTz4  
 CDC tdc; ""*g\  
 tdc.CreateCompatibleDC(&dc); M0$E_*  
 CBitmap*pOld=tdc.SelectObject(&bm); U$ ;UW3-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); t%StBq(q  
 tdc.SelectObject(pOld); dWdD^>8Ef  
 BITMAP btm; rU6A^p\,  
 bm.GetBitmap(&btm); fk!9` p'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r"|.`$:B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UG[r /w5(F  
 BITMAPINFOHEADER bih; k8r1)B4ab  
 bih.biBitCount=btm.bmBitsPixel; ]CPF7Hf  
 bih.biClrImportant=0; mF4y0r0  
 bih.biClrUsed=0; O{ 0it6  
 bih.biCompression=0; ^?*<.rsG  
 bih.biHeight=btm.bmHeight; /f drf  
 bih.biPlanes=1; hVAatn[  
 bih.biSize=sizeof(BITMAPINFOHEADER); hzT)5'_  
 bih.biSizeImage=size; %m+7$iD  
 bih.biWidth=btm.bmWidth; P#D|CP/Cu  
 bih.biXPelsPerMeter=0; Q>71uM%e`  
 bih.biYPelsPerMeter=0; VfUHqdg-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7C R6ew~  
 static int filecount=0;  0T^ 0)c  
 CString name; cICf V,j  
 name.Format("pict%04d.bmp",filecount++); UZ#oaD8H6  
 name=m_Path+name; x2'pl (^  
 BITMAPFILEHEADER bfh; LR';cR;  
 bfh.bfReserved1=bfh.bfReserved2=0; *f_A :`:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @_W13@|  
 bfh.bfSize=54+size; c=zSq%e   
 bfh.bfOffBits=54; 4c[/%e:\-  
 CFile bf; K)5j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Sp*4Z`^je  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); t#3 _M=L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AyPtbrO  
  bf.WriteHuge(lpData,size); qDU4W7|T`  
  bf.Close(); C|h Uyo  
  nCount++; (.X)=  
 } jOzi89  
 GlobalFreePtr(lpData); OzwJ 52  
 if(nCount==1) Hp>L}5 y[  
  m_Number.Format("%d picture captured.",nCount); C!ch !E#  
 else pb)kN%  
  m_Number.Format("%d pictures captured.",nCount); '.M4yif \g  
  UpdateData(FALSE); bE{Y K  
} MTKNIv|  
P$Oj3HD LM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -e_o p'`  
{ )WInPW  
 if(pMsg -> message == WM_KEYDOWN)  .FC+  
 { Z4rk$K'=1w  
  if(pMsg -> wParam == VK_ESCAPE) 3 ^K#\*P  
   return TRUE; g7a446QR\K  
  if(pMsg -> wParam == VK_RETURN) Q J-|zS.W  
   return TRUE; /|<S D.:  
 } V1pBKr)v  
 return CDialog::PreTranslateMessage(pMsg); Dh}(B$~Oz+  
} 79D~Mau#  
:`Ut.E~.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d4*SfzB  
{ ir"t@"Y;o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l#%7BGwzY  
  SaveBmp(); RV);^, b  
  return FALSE; ,B_c  
} ^g5E&0a`g  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ EwkSUA>Tm  
 CMenu pop; $;'M8L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .a7RGT3]m  
 CMenu*pMenu=pop.GetSubMenu(0); t$wbwP  
 pMenu->SetDefaultItem(ID_EXITICON); `-OzjbM  
 CPoint pt; 1dw{:X=j  
 GetCursorPos(&pt); @!u{>!~0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); } Z FoCMM  
 if(id==ID_EXITICON) q6w)zTpJGJ  
  DeleteIcon(); s\pukpf@  
 else if(id==ID_EXIT) ge:a{L  
  OnCancel(); ft1#f@b.  
 return FALSE; h`dQ OH#  
} T^(W _S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 !{X8>x  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (RV#piM  
 AddIcon(); q4&! mDU  
 return res; y<6c*e1  
} bxtH`^  
2#sFY/@  
void CCaptureDlg::AddIcon() B^r?N-Z A  
{ Q?1J<(oq9  
 NOTIFYICONDATA data; 6]~/`6Dub  
 data.cbSize=sizeof(NOTIFYICONDATA); )Uy%iE*  
 CString tip; U|V,&RlbR  
 tip.LoadString(IDS_ICONTIP); Tx!t3;Yz[  
 data.hIcon=GetIcon(0); Mms|jF oQ  
 data.hWnd=GetSafeHwnd(); peBHZJ``RX  
 strcpy(data.szTip,tip); $!MP0f\q g  
 data.uCallbackMessage=IDM_SHELL; eZqEFMBTm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; vt2. i$u  
 data.uID=98; }DS%?6}Sy  
 Shell_NotifyIcon(NIM_ADD,&data); #}+H  
 ShowWindow(SW_HIDE); W"\}##  
 bTray=TRUE; nJ]7vj,rB  
} =eUKpYI  
cx$h"  
void CCaptureDlg::DeleteIcon() UMe?nAC  
{ I9qFXvqL  
 NOTIFYICONDATA data; /MY's&D(  
 data.cbSize=sizeof(NOTIFYICONDATA); xb3G,F  
 data.hWnd=GetSafeHwnd(); bs?\ )R5/  
 data.uID=98; rzIWQFv  
 Shell_NotifyIcon(NIM_DELETE,&data); @jm+TW  
 ShowWindow(SW_SHOW); 2HmK['(  
 SetForegroundWindow(); zKGZg>q  
 ShowWindow(SW_SHOWNORMAL); Nh}-6|M  
 bTray=FALSE; 5\C(2naf  
} P dqvXc  
`gx\m=xG  
void CCaptureDlg::OnChange() R}gdN-941  
{ Dg.~"h5mT  
 RegisterHotkey(); e'A_4;~@s  
} K~,!IU_QG  
?D _4KFr  
BOOL CCaptureDlg::RegisterHotkey() h~\k;ca  
{ q"<=^vi  
 UpdateData(); CLzF84@W=  
 UCHAR mask=0; jmwN1Se>  
 UCHAR key=0; SoM,o]s#y  
 if(m_bControl) O}zHkcL  
  mask|=4; j0}wv~\  
 if(m_bAlt) 5?SE?VC=t  
  mask|=2; <b,WxR`  
 if(m_bShift) /~u^@@.  
  mask|=1; v1~l=^4&  
  key=Key_Table[m_Key.GetCurSel()]; nUpj+F#  
 if(bRegistered){  94PI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W9Azp8)p]  
  bRegistered=FALSE; y EfAa6  
 } NMK$$0U  
 cMask=mask; LF!KP  
 cKey=key; d9:I.SA)E  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -LRx}Mb9  
 return bRegistered; DZ2gnRg  
} pJ}U'*Z2  
Y GOkqI  
  四、小结 xaVX@ 3r.3  
g $Y]{VM.J  
  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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