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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: "M^mJl&*b  
  Y_~otoSoY  
  一、实现方法 *u< ZQq  
+/" \.wYv  
  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: ,K|UUosS-#  
2zuQeFsK  
#pragma data_seg("shareddata") Yvu?M8aK!  
HHOOK hHook =NULL; //钩子句柄 ,/!^ZS*  
UINT nHookCount =0; //挂接的程序数目 "z_},TCy  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 rFp>A`TJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?0qP6'nWx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \m:('^\6o  
static int KeyCount =0; . lNf.x#u  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 EG3u)}vI  
#pragma data_seg() Ynp#3 r  
0]^gT'  
  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。 Vjd>j; H  
iO2jT+i  
  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: wrsr U  
JC;&]S.  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  _~S[  
cKey,UCHAR cMask) %joU}G;"  
{ JU)k+:\a  
 BOOL bAdded=FALSE; =F %lx[9Ye  
 for(int index=0;index<MAX_KEY;index++){ U"~W3vwJ  
  if(hCallWnd[index]==0){ -zI9E!24  
   hCallWnd[index]=hWnd; Ka<J* k3  
   HotKey[index]=cKey; < Pi#-r.,  
   HotKeyMask[index]=cMask; .1_kRy2*.  
   bAdded=TRUE; \^jRMIM==  
   KeyCount++; wyXQP+9G  
   break; jdx T662q  
  } ~=|QPO(d  
 } J93xxj  
 return bAdded; 1xSG(!  
} #&%>kfeJ)<  
//删除热键 i?7 ?I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "b%FkD  
{ <;Tr   
 BOOL bRemoved=FALSE; Z#YNL-x  
 for(int index=0;index<MAX_KEY;index++){ R dNL f  
  if(hCallWnd[index]==hWnd){ |IS$Om  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F07X9s44E  
    hCallWnd[index]=NULL; p./0N.  
    HotKey[index]=0; aK 7 }}  
    HotKeyMask[index]=0; ~@#a*="  
    bRemoved=TRUE; +d(|Jid  
    KeyCount--; iq,rS"  
    break; e^$JGh2  
   } 15r=d  
  } {w7/M]m-  
 } ExeZj8U  
 return bRemoved; E=`/}2  
} c5: X$k\  
Z[eWey_  
2( m#WK7>F  
  DLL中的钩子函数如下: sz%_9;`dpL  
N,3iSH=cN[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cv7:5P  
{ fPPmUM^C9  
 BOOL bProcessed=FALSE; T''<yS  
 if(HC_ACTION==nCode) NB+/S;`  
 { m(0X_& &?z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !Lw]aHb  
   switch(wParam) .8T0OQ4  
   {  |=MhI5gsx  
    case VK_MENU: vo%"(!  
     MaskBits&=~ALTBIT; IDL0!cF  
     break; ml /S|`Drk  
    case VK_CONTROL: Yy6$q\@rV  
     MaskBits&=~CTRLBIT; HxcL3Bh$~}  
     break; M>}_2G]#F  
    case VK_SHIFT: Qkhor-f0  
     MaskBits&=~SHIFTBIT; $48 Z>ij?f  
     break; 1aCpeD4|)  
    default: //judge the key and send message q'TIN{\.{  
     break; &HtTh {  
   } o"_'cNAz  
   for(int index=0;index<MAX_KEY;index++){ r4<aEj;l  
    if(hCallWnd[index]==NULL) 0m"Ni:KEf  
     continue; 0G0(g,3p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hmnxm gx  
    { {^1''  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); AWKJ@&pA9m  
     bProcessed=TRUE; > >KCd  
    } j#Tl\S!m.I  
   } %l6E0[   
  } c*\;!dbP  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;mvVo-r*q  
   switch(wParam) +.OdrvN4)  
   { HrfS^B  
    case VK_MENU: 9%1J..c  
     MaskBits|=ALTBIT; 't5`Ni  
     break; m^=El7+  
    case VK_CONTROL: N/--6)5~0  
     MaskBits|=CTRLBIT; T[#q0bv  
     break; y%spI/(  
    case VK_SHIFT: n?;rWq"  
     MaskBits|=SHIFTBIT; xu%eg]  
     break; 1<5Ug8q  
    default: //judge the key and send message H Ix%c5^  
     break; ~_c1h@  
   } VxuV`Plf  
   for(int index=0;index<MAX_KEY;index++){ $mh\`  
    if(hCallWnd[index]==NULL) D9?.Ru0.  
     continue; R=F_U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]V_A4Df  
    { :2&"ak>N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z# bO}!  
     bProcessed=TRUE; D W^Zuu/)  
    } c+ByEP4EG  
   } :7mHPe }(  
  } 14jN0\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 G$%F`R[  
   for(int index=0;index<MAX_KEY;index++){ .Y"F3 R  
    if(hCallWnd[index]==NULL) 32j}ep.*  
     continue; ,v,rY'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0H]{,mVs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a @d 15CN  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9dBxCdpu  
   } ,&qC R sw  
  } t(9q 6x3|e  
 } }m~MN4 l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @un+y9m[C  
} S2_(lS+R  
L+(ng  
  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: zsJermF,O  
|ns?c0rM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )>S,#_e*b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %W)pZN}  
$(Mz@#%  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 7.6L1srV  
?s3S$Ih  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `fTM/"  
{ ,"XiI$Le  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O#^H.B  
 { d]" 4aS  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 4=MjyH|[Jx  
  SaveBmp(); CgrQ" N5  
  return FALSE;  J}:.I>  
 } lM{ fld  
 …… //其它处理及默认处理 xZlCFu   
} (6Z^0GL  
+E_yEH7_)  
{svo!pN:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。  mPk'a  
XW" 0:}`J  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ]| +M0:2?  
>([,yMIY  
  二、编程步骤 3m` >D e  
~IS8DW$;  
  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"; fyA-*)oHv  
kMMgY?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }Mt1C~{(  
7K:V<vX5  
  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; HP1QI/*v  
(r kg0  
  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; bAGKi.  
G9 O6Fi  
  5、 添加代码,编译运行程序。 ow.!4kx{d  
wz*iwd-  
三、程序代码 RbXR/Rd  
O6R)>Y4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ElV!C}g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) PD-&(ka.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "8{A4N1B5  
#if _MSC_VER > 1000 }: HG)V  
#pragma once .'gm2  
#endif // _MSC_VER > 1000 x9 %=d  
#ifndef __AFXWIN_H__ 4^F%bXJ)  
#error include 'stdafx.h' before including this file for PCH N+rU|iMa.  
#endif '#Au~5  
#include "resource.h" // main symbols =I@t%Y  
class CHookApp : public CWinApp r(46jV.sD:  
{ "+- 'o+  
 public: K+F"VW*?  
  CHookApp(); _!@:@e)yB{  
  // Overrides czuIs|_K*  
  // ClassWizard generated virtual function overrides  p;w&}l{{  
  //{{AFX_VIRTUAL(CHookApp) +*:mKx@Nw  
 public: /[.V(K D  
  virtual BOOL InitInstance(); -HG .GA  
  virtual int ExitInstance(); : ~vodh  
  //}}AFX_VIRTUAL At4\D+J{Vs  
  //{{AFX_MSG(CHookApp) 1x:W 3.  
  // NOTE - the ClassWizard will add and remove member functions here. 9Yv:6@.F  
  // DO NOT EDIT what you see in these blocks of generated code ! VP~2F E  
  //}}AFX_MSG d?2ORr|m=  
  DECLARE_MESSAGE_MAP() Cp6S2v I  
}; T8x)i\<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Og/aTR<;=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $`E?=L`$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); % /VCjuV  
BOOL InitHotkey(); &uK(. @  
BOOL UnInit(); 6*q1%rs:w  
#endif ^{4BcM7eH  
;7QXs39S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Mh.1KI[t  
#include "stdafx.h" 10Ik_L='  
#include "hook.h" <\~v$=G  
#include <windowsx.h> _SAM8!q4,  
#ifdef _DEBUG ,X4+i8Yc  
#define new DEBUG_NEW &*=!B9OBI  
#undef THIS_FILE U]=yCEb8p  
static char THIS_FILE[] = __FILE__; z'EQdQ)  
#endif hul,Yd) Z  
#define MAX_KEY 100  Sfz1p  
#define CTRLBIT 0x04 +[!S[KE  
#define ALTBIT 0x02 vW1^  
#define SHIFTBIT 0x01 Y 3BJ@sqz  
#pragma data_seg("shareddata")  $3^M-w  
HHOOK hHook =NULL; \yr9j$  
UINT nHookCount =0; p%I'd^}.!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey N}?|ik  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  GfE>?mG  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d:(Ex^^  
static int KeyCount =0; hv|a8=U!R  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift = :gKh  
#pragma data_seg() QnWE;zN[7A  
HINSTANCE hins; 5H0qMt P  
void VerifyWindow(); @:C)^f"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ca g5w~Px  
//{{AFX_MSG_MAP(CHookApp) Lq2Q:w'  
// NOTE - the ClassWizard will add and remove mapping macros here. e= IdqkJ%  
// DO NOT EDIT what you see in these blocks of generated code! ]F4QZV( M  
//}}AFX_MSG_MAP ,|:.0g[n  
END_MESSAGE_MAP() qzUiBwUi@  
*#T: _  
CHookApp::CHookApp() S hI1f  
{ .~f )4'T 9  
 // TODO: add construction code here, mr\,"S-`  
 // Place all significant initialization in InitInstance (p-q>@m  
} Kjd3!%4mB  
Qr$'Q7  
CHookApp theApp; :y-;V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .<%tu 0  
{ xE:jcA d$}  
 BOOL bProcessed=FALSE; 1=R$ RI  
 if(HC_ACTION==nCode) 9zwD%3Ufn  
 { L|CdTRgRCB  
  if((lParam&0xc0000000)==0xc0000000){// Key up $ZM'dIk?  
   switch(wParam) #n>U7j9`O  
   { 4z0gyCAC A  
    case VK_MENU: .l1x~(  
     MaskBits&=~ALTBIT; Nn LK!Q  
     break; oy^-?+   
    case VK_CONTROL: $hhXsu=  
     MaskBits&=~CTRLBIT; XV]N}~h o`  
     break; sgfqIe1  
    case VK_SHIFT: z &EDW 5I  
     MaskBits&=~SHIFTBIT; @]l|-xGCWn  
     break; $6rm;UH  
    default: //judge the key and send message W%L'nR~w$  
     break; wQ+pVu?6_  
   } J!uG/ Us  
   for(int index=0;index<MAX_KEY;index++){ "ko*-FrQ  
    if(hCallWnd[index]==NULL) fsL9d}  
     continue; @+b$43 ^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Msqqjhoy  
    { 9\Jc7[b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1K Fd ~U  
     bProcessed=TRUE; LYD iqOrx  
    } 4 Ej->T.  
   } TKB8%/_p  
  } \3JCFor/  
  else if((lParam&0xc000ffff)==1){ //Key down 1 /M^7Vb.  
   switch(wParam) Tb i?AJa}  
   { YV.' L  
    case VK_MENU: `K{}  
     MaskBits|=ALTBIT; 1>Sfv|ZP,  
     break; )'+[,z ;s  
    case VK_CONTROL: 2;v:Z^&  
     MaskBits|=CTRLBIT; w+)${|N?  
     break; <:9 ts@B  
    case VK_SHIFT: .LDZqWr-  
     MaskBits|=SHIFTBIT; //7YtK6  
     break; fd'kv  
    default: //judge the key and send message +``vnC  
     break; rCPIz<  
   } %'KRbY  
   for(int index=0;index<MAX_KEY;index++) HMd?`  
   { Nc\DXc-N  
    if(hCallWnd[index]==NULL) *Jsb~wta  
     continue; XDPR$u8hM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,Cr%2Wg-  
    { &>jz[3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q!l(2nva  
     bProcessed=TRUE; Y$JVxly  
    } /8l-@P. o  
   } +=($mcw#[  
  } "'v+*H 3  
  if(!bProcessed){ s<YN*~  
   for(int index=0;index<MAX_KEY;index++){ M/o?D <'  
    if(hCallWnd[index]==NULL) BN9e S   
     continue; =8]`-(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x=DxD&I!J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Bp^LLH  
   } wkp2A18n  
  } hz:7W8  
 } ~@'wqGTp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +xYu@r%R  
} YS|Dw'%g /  
$Tbsre\MJ  
BOOL InitHotkey() 5;)^o3X>  
{ u9"kF  
 if(hHook!=NULL){ 0F)v9EK(W4  
  nHookCount++; $mJv\;t  
  return TRUE; .z#eYn% d  
 } }; '@'   
 else B:"D)/\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7NvKp inQ  
  if(hHook!=NULL) gv67+Mf  
   nHookCount++; `3\aX|4@  
  return (hHook!=NULL); 2K:A4)jZ  
} AS;Sz/YP  
BOOL UnInit() yY#h 1  
{ EXSJ@k6=8s  
 if(nHookCount>1){ 6{)pF  
  nHookCount--; _^_3>}y5op  
  return TRUE; og";mC  
 } xT> 9ZZcE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); V|YQhd0kv  
 if(unhooked==TRUE){ 6:8s,a3&[k  
  nHookCount=0; GN_L"|#)=  
  hHook=NULL; FAM{p=t]HT  
 } Au2?f~#Fv  
 return unhooked; Htgo=7!?\3  
} YrL(4 Nt8  
UBL{3s^"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z1fY' f  
{ ()aCE^C  
 BOOL bAdded=FALSE; U`6|K$@  
 for(int index=0;index<MAX_KEY;index++){ e=&~6bs1U  
  if(hCallWnd[index]==0){ ~xqiasE#K  
   hCallWnd[index]=hWnd; &PJ;B)b  
   HotKey[index]=cKey; !.UE}^TV  
   HotKeyMask[index]=cMask; $`lWW6>P  
   bAdded=TRUE; W`x.qumN  
   KeyCount++; ,7wYa&  
   break; xKu#O H  
  } znrO~OK  
 } {F<0e^*  
 return bAdded; 2Hd\>{*  
} /l<(i+0  
Vit-)o{zr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EV( F!&  
{ n3p@duC4  
 BOOL bRemoved=FALSE; )%^l+w+&  
 for(int index=0;index<MAX_KEY;index++){ h\!8*e;RAW  
  if(hCallWnd[index]==hWnd){ G' U_I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]$2 yV&V&  
    hCallWnd[index]=NULL; e 6mZ;y5_  
    HotKey[index]=0; r|l?2 eO~  
    HotKeyMask[index]=0; \ ITd\)F%N  
    bRemoved=TRUE; ec ;  
    KeyCount--; zTc;-,  
    break; l>;hQh  
   } 4$iS@o|  
  } (xG%H:6,  
 } "mQp#d/'  
 return bRemoved; a]p9 [Nk  
} o-bH3Jkb]&  
6>]  
void VerifyWindow() g**!'T4&o  
{ MFROAVPZ5  
 for(int i=0;i<MAX_KEY;i++){ 6:(s8e  
  if(hCallWnd!=NULL){ o9}\vN0F  
   if(!IsWindow(hCallWnd)){ {}s/p9F4  
    hCallWnd=NULL; A l?%[-u  
    HotKey=0; %?[gBf[y  
    HotKeyMask=0; c!E{fSP  
    KeyCount--; YC1Bgz  
   } \Vme\Ke*v)  
  } +q pW"0[  
 } ymm]+v5S.]  
} dU9;sx  
_&]7  
BOOL CHookApp::InitInstance() 6 rnFXZ\  
{ Md4Q.8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?EC\ .{  
 hins=AfxGetInstanceHandle(); ;~0q23{+;U  
 InitHotkey(); (9`dLw5  
 return CWinApp::InitInstance(); deAV:c  
} l<1zLA~G  
]$drBk86bh  
int CHookApp::ExitInstance() z-MQGq xR  
{ 2,:{ 5]Q$  
 VerifyWindow(); BI%^7\HZ  
 UnInit(); {#kCqjWG  
 return CWinApp::ExitInstance(); I3 "6"  
} z]9t 5I  
<( OHX3~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E2M<I;:EA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) QqQhQGV  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f$FO 1B)  
#if _MSC_VER > 1000 ~R[ k^i.Y  
#pragma once l)\Q~^cxd  
#endif // _MSC_VER > 1000 {_b2!!p  
ueJ^Q,-t  
class CCaptureDlg : public CDialog Ug+ K:YUq  
{ cD]H~D}M  
 // Construction DY#195H  
 public: w4P;Z-Cd  
  BOOL bTray; I8! .n  
  BOOL bRegistered; /)kJ iV  
  BOOL RegisterHotkey(); ?lkB{-%rQ  
  UCHAR cKey; @2T8H  
  UCHAR cMask; IoL P*D  
  void DeleteIcon(); *f 7rLM*  
  void AddIcon(); 5Xr})%L  
  UINT nCount; 6/ 5c|  
  void SaveBmp(); nl}LT/N  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |yz[mP*;o  
  // Dialog Data FaCW +9B  
  //{{AFX_DATA(CCaptureDlg) 0 7Yak<+~  
  enum { IDD = IDD_CAPTURE_DIALOG }; w)|9iL8  
  CComboBox m_Key; pfZ[YC-  
  BOOL m_bControl; FdE?uw  
  BOOL m_bAlt; hrnE5=iY  
  BOOL m_bShift; &Y^4>y%  
  CString m_Path; PESvx>:  
  CString m_Number; Je|:\Qk  
  //}}AFX_DATA ?GH/W#{o)  
  // ClassWizard generated virtual function overrides x%s1)\^A  
  //{{AFX_VIRTUAL(CCaptureDlg) .tKBmq0xo"  
 public: Xps \+l%i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); WyOav6/*K^  
 protected: 1n<4yfJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8o+:|V~X  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hdWVvN  
  //}}AFX_VIRTUAL K6-)l isf  
  // Implementation 0 \ U*  
 protected: a>l,H#w*vW  
  HICON m_hIcon; Tv1oy%dK  
  // Generated message map functions s<LnUF1b  
  //{{AFX_MSG(CCaptureDlg) x"sbm  
  virtual BOOL OnInitDialog(); D7nK"]HG;l  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); T%oJmp?0  
  afx_msg void OnPaint(); 8Tg1 >q<  
  afx_msg HCURSOR OnQueryDragIcon();  K!ILO  
  virtual void OnCancel(); 3Qd/X&P  
  afx_msg void OnAbout(); T O]7cC  
  afx_msg void OnBrowse(); }J6:D]Q  
  afx_msg void OnChange(); ^;ZpK@Luk  
 //}}AFX_MSG -HGRrWS  
 DECLARE_MESSAGE_MAP() 4 .c1  
}; QOK,-  
#endif >yKz8SV#  
QGI@5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %0 {_b68x  
#include "stdafx.h" x*:VE57,z  
#include "Capture.h" EUs9BJFP  
#include "CaptureDlg.h" :l"B NT[/  
#include <windowsx.h> U"/T`f'H z  
#pragma comment(lib,"hook.lib") ^[.}DNR95(  
#ifdef _DEBUG \]4EAKJE  
#define new DEBUG_NEW 7_PY%4T"  
#undef THIS_FILE lx4p Tw1  
static char THIS_FILE[] = __FILE__; 9]Ue%%vM  
#endif "f 89   
#define IDM_SHELL WM_USER+1 2]?=\_T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,\iXZ5"R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E9mu:T  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h2x9LPLBxT  
class CAboutDlg : public CDialog baD063P;  
{ bK!h{Rr  
 public: C_>XtcU  
  CAboutDlg(); oh:9v+  
  // Dialog Data %\,9S`0  
  //{{AFX_DATA(CAboutDlg) _BA; H+M  
  enum { IDD = IDD_ABOUTBOX }; LI@BB:)[  
  //}}AFX_DATA s}". po]  
  // ClassWizard generated virtual function overrides D'u7"^=  
  //{{AFX_VIRTUAL(CAboutDlg) l0^cdl-  
 protected: ,vmn{gz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )bih>>H  
  //}}AFX_VIRTUAL qD*y60~]zz  
  // Implementation .-iW T4Dn  
 protected: [/q Bvuun  
  //{{AFX_MSG(CAboutDlg) sQA_6]`  
  //}}AFX_MSG AB\Ya4O"9  
  DECLARE_MESSAGE_MAP() 2DPv7\fW  
}; RHBQgD$  
&-qQF`7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m W>Iib|  
{ >v, si].  
 //{{AFX_DATA_INIT(CAboutDlg) pl3ap(/  
 //}}AFX_DATA_INIT Lu6g`O:['  
} ?e6>dNw  
wdP(MkaV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E"VF BKB  
{ rxX4Cw]\"y  
 CDialog::DoDataExchange(pDX); hsrf2Xw[  
 //{{AFX_DATA_MAP(CAboutDlg) ^?H|RAp  
 //}}AFX_DATA_MAP $m#^0%  
} dq.U#Rhrx  
.B<Bqr@?8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]w>o=<?b  
 //{{AFX_MSG_MAP(CAboutDlg) ]i(/T$?~  
 // No message handlers 4@{?4k-cq  
 //}}AFX_MSG_MAP _b%)  
END_MESSAGE_MAP() W;=Ae~  
/;(ji?wN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) kd!?N  
: CDialog(CCaptureDlg::IDD, pParent) @k h<b<a4  
{ 4 j=K3m  
 //{{AFX_DATA_INIT(CCaptureDlg) JqMF9|{H  
  m_bControl = FALSE; 6Jq[]l"v  
  m_bAlt = FALSE; ,k~' S~w.  
  m_bShift = FALSE; 1UJrPM%  
  m_Path = _T("c:\\"); V6P-?Nd  
  m_Number = _T("0 picture captured."); Dh8'og)7  
  nCount=0; siI%6Gn;  
  bRegistered=FALSE; `WXlq#:K  
  bTray=FALSE; 8 5ET$YV  
 //}}AFX_DATA_INIT qJ`:$U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f%.Ngf9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z mip  
} 4zS0kk;+  
=[]6NjKS,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ciODTq?  
{ 3E*m.jX  
 CDialog::DoDataExchange(pDX); [s[ZOi!;I  
 //{{AFX_DATA_MAP(CCaptureDlg) & V>rq'~;  
  DDX_Control(pDX, IDC_KEY, m_Key); 1}a4AGAp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); R]X 0D.  
  DDX_Check(pDX, IDC_ALT, m_bAlt); vb]kh _  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uEJ8Lmi  
  DDX_Text(pDX, IDC_PATH, m_Path); xA(z/%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); lh'S_p8g  
 //}}AFX_DATA_MAP y8s!sO  
} _xv3UzD  
exhU!p8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @T\n@M]  
//{{AFX_MSG_MAP(CCaptureDlg) _Z[0:4  
 ON_WM_SYSCOMMAND() z5$Q"Y.D  
 ON_WM_PAINT() j~{cT/5Y_  
 ON_WM_QUERYDRAGICON() mF\!~ag|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) \wA:58 -j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -%"PqA/1zj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V_gKl;Kfe8  
//}}AFX_MSG_MAP 7C7.}U  
END_MESSAGE_MAP() ~i;{+j6Ho!  
t([}a ~1}  
BOOL CCaptureDlg::OnInitDialog() e9[72V  
{ J;obh.}u"{  
 CDialog::OnInitDialog(); dW4jkjap  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); wUCxa>h'  
 ASSERT(IDM_ABOUTBOX < 0xF000); q5R| ^uf  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }?9&xVh?\  
 if (pSysMenu != NULL) ZEI,9`t!  
 { jj[6oNKE1  
  CString strAboutMenu; fYUV[Gm  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l{Df{1b.  
  if (!strAboutMenu.IsEmpty()) L_!ShE  
  { oVy{~D=  
   pSysMenu->AppendMenu(MF_SEPARATOR); FoK2h!_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _F%`7j  
  } 4c< s"2F  
 } uem-fTG  
 SetIcon(m_hIcon, TRUE); // Set big icon ).5 X  
 SetIcon(m_hIcon, FALSE); // Set small icon x>[]Qk^?q  
 m_Key.SetCurSel(0); Io.RT+slB  
 RegisterHotkey(); D8Fi{?A#FV  
 CMenu* pMenu=GetSystemMenu(FALSE); d{4;qM#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); GHGyeqNM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); iwJ_~   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2HFn\kjj.s  
 return TRUE; // return TRUE unless you set the focus to a control 1'<C-[1  
} v~Q'm1!O4\  
oa:YAq T  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /J#(8p  
{ \A[l(aB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kCTf>sJe  
 { tNT Sy =  
  CAboutDlg dlgAbout; YGyv)\  
  dlgAbout.DoModal(); ps 3 )d  
 } 3 39q%j$  
 else bGWfMu=n  
 { )J S6W  
  CDialog::OnSysCommand(nID, lParam); >-A@6Qe_  
 } f(5(V %  
} p +i 1sY  
5^Qa8yA>7  
void CCaptureDlg::OnPaint() !y _{mE?V(  
{ d<a|dwAeh  
 if (IsIconic()) O{LCHtN  
 { '}_r/l]K  
  CPaintDC dc(this); // device context for painting C27:ty V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {]^Ixm-,f  
  // Center icon in client rectangle ?mg@zq8  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0\%g@j-aD  
  int cyIcon = GetSystemMetrics(SM_CYICON); -G,}f\Cg  
  CRect rect; 9wWBE<}>u  
  GetClientRect(&rect); $"kPzo~B_  
  int x = (rect.Width() - cxIcon + 1) / 2; lME>U_E  
  int y = (rect.Height() - cyIcon + 1) / 2; T0w_d_aS  
  // Draw the icon aas.-N T  
  dc.DrawIcon(x, y, m_hIcon); v=N?(6T  
 } GDxv2^4  
 else =j,WQ66r3  
 { Nwi|>'\C  
  CDialog::OnPaint(); yn62NyK  
 } &P?2H66s  
} j<<d A[X  
Urr%SIakvM  
HCURSOR CCaptureDlg::OnQueryDragIcon() PE%$g\#?  
{ }g}Eh>U  
 return (HCURSOR) m_hIcon; !a@)6or  
} %T/@/,7h  
K!-OUm5A  
void CCaptureDlg::OnCancel() 9|+6@6VY!  
{ ]i*ucW4  
 if(bTray) C%XO|sP  
  DeleteIcon(); /v R>.'  
  CDialog::OnCancel(); )j_El ]?  
} M5^Y W#e  
t2N W$ -E  
void CCaptureDlg::OnAbout() &3Zq1o  
{ 5f-b>=02  
 CAboutDlg dlg; ^dQ{vL@9b9  
 dlg.DoModal(); Y9+_MxC"  
} WTvUz.Et  
ot^pxun  
void CCaptureDlg::OnBrowse() @5%&wC  
{ "7B}hZ^)W  
 CString str; ?5C'9 V  
 BROWSEINFO bi; @UD:zUT)F  
 char name[MAX_PATH]; ~r--dU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W: ]FYC  
 bi.hwndOwner=GetSafeHwnd(); Ww7Ya]b.k  
 bi.pszDisplayName=name; I~GF%$-G  
 bi.lpszTitle="Select folder"; d?2V2`6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y %JQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); V'vR(Wx  
 if(idl==NULL) AcH-TIgM/  
  return; H9cPtP~a)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @]=40Yj~w  
 str.ReleaseBuffer(); ks4`h>i  
 m_Path=str; [?!I*=*b  
 if(str.GetAt(str.GetLength()-1)!='\\') '0+*  
  m_Path+="\\"; 0t <nH%N}^  
 UpdateData(FALSE); $83B10OQ&L  
} `AJ[g>py^|  
b^1QyX^?:  
void CCaptureDlg::SaveBmp() eVXXn)>  
{ F-yY(b]$  
 CDC dc; TQa}Ps  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3nxG>D7  
 CBitmap bm; U&5* >fd=  
 int Width=GetSystemMetrics(SM_CXSCREEN); Kgbm/L0XR*  
 int Height=GetSystemMetrics(SM_CYSCREEN); oUv26t~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); u!_l/'\  
 CDC tdc; $]v}X},,  
 tdc.CreateCompatibleDC(&dc); ^J'_CA  
 CBitmap*pOld=tdc.SelectObject(&bm); / ;]5X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ht3.e[%'b  
 tdc.SelectObject(pOld); ?8b19DMK6  
 BITMAP btm; !|cg=  
 bm.GetBitmap(&btm); yeo&Qz2vU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; h!EA;2yGKa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tq3Wga!5  
 BITMAPINFOHEADER bih; }r,\0Wm  
 bih.biBitCount=btm.bmBitsPixel; E[H  
 bih.biClrImportant=0; FKa";f"  
 bih.biClrUsed=0; X\|!  
 bih.biCompression=0; Tg\bpLk0=  
 bih.biHeight=btm.bmHeight; YDt+1Kw}D  
 bih.biPlanes=1; y>^a~}Zq  
 bih.biSize=sizeof(BITMAPINFOHEADER); G95,J/w  
 bih.biSizeImage=size; {Mx(|)WkL  
 bih.biWidth=btm.bmWidth; ^t;z;.g  
 bih.biXPelsPerMeter=0; M([#Py9h  
 bih.biYPelsPerMeter=0; o96C^y{~S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "W|A^@r}  
 static int filecount=0; wVf~FssN  
 CString name; d$dy6{/YD  
 name.Format("pict%04d.bmp",filecount++); ahB qYA K9  
 name=m_Path+name; V$^jlWdR  
 BITMAPFILEHEADER bfh; {28|LwmL  
 bfh.bfReserved1=bfh.bfReserved2=0; $XBK_ 5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); zG!nqSDG  
 bfh.bfSize=54+size; dAo;y.3  
 bfh.bfOffBits=54; Rj8%% G-pt  
 CFile bf; P]_d;\ !"v  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2eT?qCxqc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); dUI5,3*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'D\Q$q  
  bf.WriteHuge(lpData,size); )Fw/Cu  
  bf.Close(); _X6'u J  
  nCount++; &p0e)o~Ux  
 } &d#R'Z  
 GlobalFreePtr(lpData); 8.E"[QktZ  
 if(nCount==1) gYpMwC{*d  
  m_Number.Format("%d picture captured.",nCount); Ui{%q @  
 else v3tJtb^'!  
  m_Number.Format("%d pictures captured.",nCount); bOS)vt*V  
  UpdateData(FALSE); MK$u }G  
} 'M90Yia  
sp9gz~Kq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J=4>zQLW  
{ PNU(;&2<  
 if(pMsg -> message == WM_KEYDOWN) E-e(K8R  
 { U84W(X  
  if(pMsg -> wParam == VK_ESCAPE) P]E-Wp'p  
   return TRUE; j0jl$^  
  if(pMsg -> wParam == VK_RETURN) gv#\}/->4  
   return TRUE; Y +gY"  
 } _T=g?0 q  
 return CDialog::PreTranslateMessage(pMsg); VFHd2Ea(  
} LF<&gC  
,Kit@`P%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8`Ya7c>  
{ eim+oms  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ my=f}%k=  
  SaveBmp(); RaZ>.5 D  
  return FALSE; 92+8zX  
} c\bL_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {pzj@b 1S  
 CMenu pop; 0c_xPBbB+  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I`>U#x*  
 CMenu*pMenu=pop.GetSubMenu(0); v9$!v^U"D  
 pMenu->SetDefaultItem(ID_EXITICON); rr<E#w  
 CPoint pt; &4#Zi.]  
 GetCursorPos(&pt); [,%=\%5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l6viP}R  
 if(id==ID_EXITICON) 8xpplo8  
  DeleteIcon(); xNP_>Qa~  
 else if(id==ID_EXIT) D7Q+w  
  OnCancel(); En5oi  
 return FALSE; [3%mNNk  
} iyskADS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s?SspuV  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) x3@-E  
 AddIcon(); oFY!NMq}:  
 return res; ON?Y Df  
} D$>_W,*V  
,pNx(a  
void CCaptureDlg::AddIcon() R[WiW RfD  
{ |"H 2'L$  
 NOTIFYICONDATA data; ~z,o):q1 }  
 data.cbSize=sizeof(NOTIFYICONDATA); (!j#u)O  
 CString tip; 6CJMQi,kn  
 tip.LoadString(IDS_ICONTIP); 8;PkuJR_]  
 data.hIcon=GetIcon(0); yNTd_XPL  
 data.hWnd=GetSafeHwnd(); IThd\#=  
 strcpy(data.szTip,tip); . ,7bGY 1$  
 data.uCallbackMessage=IDM_SHELL; p!.~hw9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~%{2Z_t$  
 data.uID=98; PnsBDf%v  
 Shell_NotifyIcon(NIM_ADD,&data); Jh[0xb  
 ShowWindow(SW_HIDE); Onmmcem  
 bTray=TRUE; Bd>~F7VWs  
} @Mk`Tl  
>r.]a`  
void CCaptureDlg::DeleteIcon() YJi%vQ*]  
{ 8h )XULs2  
 NOTIFYICONDATA data; 2*Z2uV^  
 data.cbSize=sizeof(NOTIFYICONDATA);  8*ZsR)!  
 data.hWnd=GetSafeHwnd(); rIb+c=|F  
 data.uID=98; Vej$|nF  
 Shell_NotifyIcon(NIM_DELETE,&data); QFh1sb)]d)  
 ShowWindow(SW_SHOW); O*yxOb*  
 SetForegroundWindow(); M5xJ_yjG  
 ShowWindow(SW_SHOWNORMAL); Qm%F]nyy  
 bTray=FALSE; ^aFm6HS1  
} 9I/b$$?D  
MNT~[Z9L5G  
void CCaptureDlg::OnChange() rk=D5E7  
{ N2r zHK  
 RegisterHotkey(); .nV2 n@SR  
} Ebg8qDE  
5/H,UL  
BOOL CCaptureDlg::RegisterHotkey() ,'#TdLe  
{ 7y=>Wa?T[  
 UpdateData(); E-LkP;  
 UCHAR mask=0; Ob d n#Wm=  
 UCHAR key=0; $JE,u' JQ  
 if(m_bControl) !(s n9z#  
  mask|=4; e3~MU6  
 if(m_bAlt) > mGH4{H  
  mask|=2; 8\"<t/_ W  
 if(m_bShift) ZbnAAbfKH  
  mask|=1; Uqr>8|t?  
  key=Key_Table[m_Key.GetCurSel()]; jm0p%%z  
 if(bRegistered){ _=v#"l  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); +z >)'#  
  bRegistered=FALSE; ?H{[u rLn  
 } N(/)e  
 cMask=mask; [m~J6WB  
 cKey=key; .6?"<zdPU  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); igO>)XbsM  
 return bRegistered; MDMd$] CW  
} p6M9uu  
WhPP4 #  
  四、小结 tRjv  -  
`y8pwWo-o  
  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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