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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: V$^jlWdR  
  }cKB)N BJb  
  一、实现方法 \o9 \i kR  
)9QtnM  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: \;LDE`Q_x  
7>vm?a^D2&  
#pragma data_seg("shareddata") #&Sr;hAJ  
HHOOK hHook =NULL; //钩子句柄 *XVwTW[a  
UINT nHookCount =0; //挂接的程序数目 A4K.,bZ   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {$*N1$(%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |c_qq Bd  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey jc} G+|`  
static int KeyCount =0; TJ|Jv8j<s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 7s9h:/Lu  
#pragma data_seg() B /? L$m  
?pDr"XH~  
  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。 PnlI {d  
d=!:UB  
  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: Cy/&KWLenf  
U|(+-R8Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR -N *L1Zj  
cKey,UCHAR cMask) EY}:aur  
{ em$pU*`P  
 BOOL bAdded=FALSE; y_]+;%w:  
 for(int index=0;index<MAX_KEY;index++){ 1<@SMcj>  
  if(hCallWnd[index]==0){ mkl{Tp*  
   hCallWnd[index]=hWnd; ,$P,x  
   HotKey[index]=cKey; FR&`R  
   HotKeyMask[index]=cMask; 1H)mJVIKkB  
   bAdded=TRUE; ~Bd=]a$mj  
   KeyCount++; $o^Z$VmL  
   break; JzHG5nmB  
  } NW3 c_]`=  
 } eim+oms  
 return bAdded; my=f}%k=  
} RaZ>.5 D  
//删除热键 92+8zX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c\bL_  
{ {pzj@b 1S  
 BOOL bRemoved=FALSE; ZykMri3bi  
 for(int index=0;index<MAX_KEY;index++){ W :w~ M'o  
  if(hCallWnd[index]==hWnd){ s}D>.9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]BQYVx/  
    hCallWnd[index]=NULL; @ [$_cGR7  
    HotKey[index]=0; y4V:)@ P  
    HotKeyMask[index]=0; s0kp(t!fiu  
    bRemoved=TRUE; gT+/nSrLV  
    KeyCount--; enoj4g7em^  
    break; : Mf"   
   } a QH6akH  
  } gr=h!'m  
 } %x)b Z=An  
 return bRemoved; +2tQ FV;  
} ==[,;g x  
+^)v"@,VP  
/@os*c|je  
  DLL中的钩子函数如下: +SJ.BmT  
{K(mfTqm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) IG-\&  
{ 5pO|^G j1  
 BOOL bProcessed=FALSE; X1L@ G  
 if(HC_ACTION==nCode) K %^n.  
 { Rx%S<i;9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^5mc$~1`  
   switch(wParam) L9x-90'q,  
   {  v gN!9  
    case VK_MENU: !>UlvT-  
     MaskBits&=~ALTBIT; {Gxe%gu6K  
     break; /--p#Gh'  
    case VK_CONTROL: t6+m` Kq  
     MaskBits&=~CTRLBIT; )?n'ZhsX  
     break; "Fz.# U  
    case VK_SHIFT: "gM^o  
     MaskBits&=~SHIFTBIT; >rnVT K  
     break; Z$oy;j99y  
    default: //judge the key and send message h}bfZL  
     break; E?m~DYnU  
   } "LyD  
   for(int index=0;index<MAX_KEY;index++){  cby#  
    if(hCallWnd[index]==NULL) i`,FXF)  
     continue;  ;C]Ufk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h}b:-a  
    { xNz(LZ.c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #-hO\ QdC  
     bProcessed=TRUE;  *kr/,_K  
    } x2"iZzQlD  
   } LQ0/oYmNc  
  } yNu_>!Cp5  
  else if((lParam&0xc000ffff)==1){ //有键按下 {.Tx70kn  
   switch(wParam) ^l &lwSRVt  
   { 6( HF)z  
    case VK_MENU: UD I{4+z  
     MaskBits|=ALTBIT; n:j'0WW  
     break; %>_[b,  
    case VK_CONTROL: GAGS-G#  
     MaskBits|=CTRLBIT; f^c+M~\JKj  
     break; qsj{0Go  
    case VK_SHIFT: p [O6  
     MaskBits|=SHIFTBIT; !iXRt")  
     break; sXKkZ+2q  
    default: //judge the key and send message lU WXXuO]  
     break; 7Z-j'pq  
   } Z%T Ajm  
   for(int index=0;index<MAX_KEY;index++){ |diI(2w  
    if(hCallWnd[index]==NULL) %E?Srs}j  
     continue; Vns3859$8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~^t@TMk$  
    { H DVimoOq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bMH~vR  
     bProcessed=TRUE; y@P%t9l  
    } De$AJl  
   } "W<Y1$Y=Y  
  } 'uPAG;)m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 P5S ]h  
   for(int index=0;index<MAX_KEY;index++){ %&ejO= r  
    if(hCallWnd[index]==NULL) cx}Yu8  
     continue; J8|MK.oD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "CJVtO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j50vPV8m  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 MJn-] E  
   } _k84#E0  
  } O&%'j  
 } +ikSa8)*i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %L|fTndKH  
} \Lx=iKs<  
rb?7i&-  
  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: fv+]iK<{  
>7U/TVd&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1HJ: ?]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .35(MFvq!  
d\z6Ob"t  
  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: =j7Du[?Vu  
dab]>% M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]>3Y~KH(  
{ w,{h9f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6j E.X  
 { &OR(]Wt0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;$p!dI\-Q  
  SaveBmp(); IUMv{2C  
  return FALSE; Pwh}hG1s a  
 } fI.|QD*$b  
 …… //其它处理及默认处理 Y2|i>5/|<  
} 9#8vPjXW}.  
)>a~%~:  
RQ+,7Ir  
  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。 !V|{(>+<  
(m]l -Re  
  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。 8PI%Z6  
d)%WaM%V  
  二、编程步骤 ~id6^#&>  
4,RPidv%O  
  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"; E^8|xT'h6  
xd Z$|{,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Z)!8a$M~  
i'Y8-})  
  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; %ms%0%  
U-|]A\`)I  
  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; ly0R'4j \  
;hj lRQ\  
  5、 添加代码,编译运行程序。 F^Ut ZG+  
h5?^MRZS  
三、程序代码 MU<(O}  
6?Ncgj &@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Om3Ayk}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) InPE_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ >?g@Nt8  
#if _MSC_VER > 1000 j^G=9r[,  
#pragma once >%/x~UFc5  
#endif // _MSC_VER > 1000 :!gNOR6Lh  
#ifndef __AFXWIN_H__ CmEqo;Is  
#error include 'stdafx.h' before including this file for PCH 'g#%>  
#endif )~2\4t4|g  
#include "resource.h" // main symbols \J LGw1F  
class CHookApp : public CWinApp Bdo{zv&A  
{ `}X3f#eO&  
 public: 5F kdGF  
  CHookApp(); F5)`FM^R  
  // Overrides x&B&lFmo 8  
  // ClassWizard generated virtual function overrides }#z1>y!#  
  //{{AFX_VIRTUAL(CHookApp) ?v^NimcZ  
 public: M/S~"iD  
  virtual BOOL InitInstance(); <q63?Ms'  
  virtual int ExitInstance(); Vl.,e1)6  
  //}}AFX_VIRTUAL :Cq73:1\B  
  //{{AFX_MSG(CHookApp) NuZ2,<~9  
  // NOTE - the ClassWizard will add and remove member functions here. Dfs^W{YA  
  // DO NOT EDIT what you see in these blocks of generated code ! =VC18yA  
  //}}AFX_MSG I}f`iBG  
  DECLARE_MESSAGE_MAP() @SfQbM##%  
}; IDct!53~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 96WzgHPWo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xGs}hVlZiC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <kB:`&X<\  
BOOL InitHotkey(); =D<0&M9C  
BOOL UnInit(); !GOaBs  
#endif j~v`q5X  
@SX%q&-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Ak[X`e T  
#include "stdafx.h" {FI zoR"  
#include "hook.h" )uqzu%T  
#include <windowsx.h> c 4z&HQd  
#ifdef _DEBUG %H{pU:[5*  
#define new DEBUG_NEW ]r`;89:s>  
#undef THIS_FILE -K{R7  
static char THIS_FILE[] = __FILE__; "vGh/sXW  
#endif H cmW  
#define MAX_KEY 100 1>(EvY}Y\  
#define CTRLBIT 0x04 R"ON5,E  
#define ALTBIT 0x02 G,C`+1$*  
#define SHIFTBIT 0x01 *6I$N>1  
#pragma data_seg("shareddata") d4o ^+\  
HHOOK hHook =NULL; (MGg r  
UINT nHookCount =0; J[lC$X[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Hq.rG-,p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT eV7;#w<]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Vr2A7kq  
static int KeyCount =0; gP_N|LuF"  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  : (UK'i  
#pragma data_seg() uFr12ZFgK  
HINSTANCE hins; "FHJ_$!  
void VerifyWindow(); Q,?_;,I}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /@:X0}L  
//{{AFX_MSG_MAP(CHookApp) >n7h%c  
// NOTE - the ClassWizard will add and remove mapping macros here. 0C zQel)L:  
// DO NOT EDIT what you see in these blocks of generated code! TdFU,  
//}}AFX_MSG_MAP *\ii +f-  
END_MESSAGE_MAP() I`_2Q:r  
(%_X{R'  
CHookApp::CHookApp() f:Pl Mv!{  
{ 8eqTA8$?  
 // TODO: add construction code here, T Q41i/{  
 // Place all significant initialization in InitInstance ElO|6kOBYG  
} ?G`m;S  
_E '?U  
CHookApp theApp; CL0 lMZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9NTNulD>P  
{ 8LV6E5Q  
 BOOL bProcessed=FALSE; /2Izj/Q  
 if(HC_ACTION==nCode) ?LMQz=  
 { y._'o7%  
  if((lParam&0xc0000000)==0xc0000000){// Key up @a 9.s  
   switch(wParam) UL[,A+X8D  
   { j]Gn\QF  
    case VK_MENU: !Z_+H<fi+I  
     MaskBits&=~ALTBIT; e!6yxL*[@[  
     break; !wp1Df[  
    case VK_CONTROL: =$OGHc  
     MaskBits&=~CTRLBIT; suEK;Bk9  
     break; Nu7>G  
    case VK_SHIFT: 7O1MC 8{  
     MaskBits&=~SHIFTBIT; '$FF/|{  
     break; ] SJ#:7  
    default: //judge the key and send message 7z? ;z<VJ  
     break; |d0ZB_ci  
   } Kx9u|fp5  
   for(int index=0;index<MAX_KEY;index++){ E2DfG^sGV  
    if(hCallWnd[index]==NULL) YR'F]FI  
     continue; l'I:0a 4T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )<5k+O~  
    { )j;^3LiV3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); L:HvrB~  
     bProcessed=TRUE; (z sG!v  
    } J~%43!X\K  
   } m%0 -3c(  
  } O9daeIF0#  
  else if((lParam&0xc000ffff)==1){ //Key down GDSV:]hL  
   switch(wParam) }=X: F1S  
   { o`f^m   
    case VK_MENU: ZLjAhd)  
     MaskBits|=ALTBIT; 3(e_2v  
     break; [9sEc  
    case VK_CONTROL: G&S2U=KdV%  
     MaskBits|=CTRLBIT; L{1sYR%s\  
     break; t:2DB)  
    case VK_SHIFT: $udhTI#,  
     MaskBits|=SHIFTBIT; 44KoOY_  
     break; N3"JouP  
    default: //judge the key and send message <0d2{RQ;  
     break; 40?RiwwD  
   } qyM/p.mP  
   for(int index=0;index<MAX_KEY;index++) J>(X0@eWz  
   { TuQGF$n@  
    if(hCallWnd[index]==NULL) xM%4/QE+  
     continue; tp`1S+'~j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ??F* Z" x  
    { |Gic79b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R;DU68R  
     bProcessed=TRUE; Sf S3}Tn[  
    } F! =l r  
   } +W4}&S  
  } OZ\6qMH3e  
  if(!bProcessed){ #Hrzk!&9   
   for(int index=0;index<MAX_KEY;index++){ Mj;V.Y  
    if(hCallWnd[index]==NULL) H,}&=SCk  
     continue; W6<oy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F! !HwI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >!Yuef <P  
   } ET.jjV  
  } c)#P}Ai  
 } X +!+&RAN*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JmCMFq B9  
} DFMpU.BN W  
gsL=_# ?  
BOOL InitHotkey() e!5} #6Kd  
{ w(@r-2D"  
 if(hHook!=NULL){ Jk*cuf `rq  
  nHookCount++; @` KYgjjH  
  return TRUE; , ;,B7g  
 } krfXvQJwJ  
 else .D W>c}1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); o-6d$c}{f  
  if(hHook!=NULL) `<9>X9.+  
   nHookCount++; LGt>=|=bj  
  return (hHook!=NULL); c`<2&ke  
} 3y)\dln  
BOOL UnInit() 2j+w5KvU  
{ C@XS  
 if(nHookCount>1){ }xsO^K  
  nHookCount--; k|-\[Yl.  
  return TRUE; 6 \8d6x>  
 } (fpz",[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D;+/ bll7  
 if(unhooked==TRUE){ IQJ"B6U)  
  nHookCount=0; [NSslVr  
  hHook=NULL; .?{no}u.  
 } f30J8n"k  
 return unhooked; ~A>fB2.pM  
} yz68g?"  
M5no4P<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =e6p v#  
{ -$8ew+  
 BOOL bAdded=FALSE; vh\i ^  
 for(int index=0;index<MAX_KEY;index++){ Ic(qA{SM  
  if(hCallWnd[index]==0){ `O6#-<>  
   hCallWnd[index]=hWnd; F;Q,cg M  
   HotKey[index]=cKey; s!(R  
   HotKeyMask[index]=cMask; MtJ-pa~n  
   bAdded=TRUE; :{a< ~n`  
   KeyCount++; pyhXET '  
   break; |mt W)  
  } ZxvH1qx8  
 } es7;eH*O9  
 return bAdded; 8$NVVw]2,  
} YNBM\Q  
=2&\<Q_Fi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b~zSsws.  
{ 'OnfU{Ai  
 BOOL bRemoved=FALSE; ,1ev2T  
 for(int index=0;index<MAX_KEY;index++){ .RpJZ[E  
  if(hCallWnd[index]==hWnd){ Xmr}$<<=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8xB-cE  
    hCallWnd[index]=NULL; u[)X="-e#  
    HotKey[index]=0; m4m-JD|v  
    HotKeyMask[index]=0; 58Ibje  
    bRemoved=TRUE; k'iiRRM  
    KeyCount--; J2qsZ  
    break; (1z"=NCp  
   } ]({ -vG\m  
  } 5qrD~D '  
 } b^HDN(v  
 return bRemoved; \=0;EI-j  
} ]1++$Ej  
)|*Qs${tF  
void VerifyWindow() <)ZQRE@  
{ |5vcT, A  
 for(int i=0;i<MAX_KEY;i++){ <ww D*t  
  if(hCallWnd!=NULL){ c+l1 l0BA  
   if(!IsWindow(hCallWnd)){ eKr>>4,-P  
    hCallWnd=NULL; [+o{0o>  
    HotKey=0; D|OGlP  
    HotKeyMask=0; #R5\k-I  
    KeyCount--; StJb-K/_cL  
   } -`' |z+V  
  } 8;gi8Y  
 } ; $rQ  
} N1'"7eg/  
Xy(QK2|  
BOOL CHookApp::InitInstance() c=u+X` Q  
{ 4 $R!)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [#GBn0BG)  
 hins=AfxGetInstanceHandle(); 3uYLA4[-B  
 InitHotkey(); =G}a%)?As\  
 return CWinApp::InitInstance(); [ bnu DS  
} \~#\ [r_  
Z8=?Hu  
int CHookApp::ExitInstance() b%lB&}uw}  
{ HwFg;r  
 VerifyWindow(); GXZ="3W |  
 UnInit(); ) k/&,J3  
 return CWinApp::ExitInstance(); 0#NMNZ  
} QD.5o S  
=OK#5r[UV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k5< n:dS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -o+t&m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P' VHga  
#if _MSC_VER > 1000 XEiVs\) G  
#pragma once \ZRII<k5)  
#endif // _MSC_VER > 1000 ()6% 1zCO  
A'w+Lc.2  
class CCaptureDlg : public CDialog "c[>>t  
{ 4(\1z6?D  
 // Construction :Ak^M~6a5  
 public: :P q&l.  
  BOOL bTray; -`4]u!A  
  BOOL bRegistered; ZJ{DW4#t  
  BOOL RegisterHotkey(); SGl|{+(A  
  UCHAR cKey; U)kyq  
  UCHAR cMask; mH,s!6j?Vp  
  void DeleteIcon(); 4>(K~v5;N  
  void AddIcon(); Mg\588cI  
  UINT nCount; #m|el@)  
  void SaveBmp(); 9,fV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Mzg'$]N  
  // Dialog Data DAq H  
  //{{AFX_DATA(CCaptureDlg) ai;!Q%B#Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; l]|&j`'O  
  CComboBox m_Key; bpsyO>lx/  
  BOOL m_bControl; TU?n;h#TZ  
  BOOL m_bAlt; k Fl* Im  
  BOOL m_bShift; %# uw8V  
  CString m_Path; Wqv7  
  CString m_Number; t'F$/mx.  
  //}}AFX_DATA >IQ&*Bb  
  // ClassWizard generated virtual function overrides #xmiUN,|  
  //{{AFX_VIRTUAL(CCaptureDlg) ^(&2  
 public: ^RnQX#+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y<;C>Rs  
 protected: >> cW0I/`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?4SYroXUX|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q[/g3D\G  
  //}}AFX_VIRTUAL _dd_Z40R  
  // Implementation KdR\a&[MA  
 protected: O#igH  
  HICON m_hIcon; 26~rEOgJ  
  // Generated message map functions ;s3@(OnjZ  
  //{{AFX_MSG(CCaptureDlg) Rb<| <D+  
  virtual BOOL OnInitDialog(); d '2JMdbc  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); :C;fEJN  
  afx_msg void OnPaint(); _$*-?*V&  
  afx_msg HCURSOR OnQueryDragIcon(); 'tTlBf7#  
  virtual void OnCancel(); Db2#QQ  
  afx_msg void OnAbout(); ?Ho$fGz  
  afx_msg void OnBrowse(); fXevr `  
  afx_msg void OnChange(); h`fZ 8|yw  
 //}}AFX_MSG "Io-%S u+  
 DECLARE_MESSAGE_MAP() NTJ,U2  
}; S ?t `/"O  
#endif vasw@Uto)  
toF6 Z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'NWvQR<X  
#include "stdafx.h" lU|ltnU  
#include "Capture.h" 6Hc25NuQZ  
#include "CaptureDlg.h" 7# 'j>]  
#include <windowsx.h> 3znhpHO)  
#pragma comment(lib,"hook.lib") M/V"Ke"N  
#ifdef _DEBUG F-Z>WC{+  
#define new DEBUG_NEW Q9y|1Wg1W  
#undef THIS_FILE *QW.#y>"j  
static char THIS_FILE[] = __FILE__; dY?l oFz  
#endif A f?&VD4K  
#define IDM_SHELL WM_USER+1 XF{2'x_R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LzXIqj'H7T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N0fE*xo  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'PMzm/;8st  
class CAboutDlg : public CDialog $.DD^ "9  
{ RW>F %P  
 public: m$Tt y[0  
  CAboutDlg(); /XRgsF  
  // Dialog Data ^umHuAAE  
  //{{AFX_DATA(CAboutDlg) Ahd{f!  
  enum { IDD = IDD_ABOUTBOX }; 8Pom^QopK  
  //}}AFX_DATA (`n*d3  
  // ClassWizard generated virtual function overrides tSDp>0yZ3  
  //{{AFX_VIRTUAL(CAboutDlg) E3Z>R=s  
 protected: -NG9?sI\U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =L$RY2S"  
  //}}AFX_VIRTUAL "z.!h(Eq  
  // Implementation y^p%/p%  
 protected: @Ng q+uXm  
  //{{AFX_MSG(CAboutDlg) j@Us7Q)A(  
  //}}AFX_MSG nkkGJV!  
  DECLARE_MESSAGE_MAP() suj}A  
}; jaThS!>v  
t[%=[pJHW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QL(}k)dB  
{ `).;W  
 //{{AFX_DATA_INIT(CAboutDlg) 0txSF^x  
 //}}AFX_DATA_INIT lSId<v?C>  
} x^F2Ywp%  
'.&,.E&{$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y(#F&^|  
{ hYCyc -W  
 CDialog::DoDataExchange(pDX); GLl@ 6S>v  
 //{{AFX_DATA_MAP(CAboutDlg) ZG)C#I1;O  
 //}}AFX_DATA_MAP Jf2:[ Mq  
} N_!Zn"J  
of<>M4/g4y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L3Q1az!Ct  
 //{{AFX_MSG_MAP(CAboutDlg) _Q;M$.[zyR  
 // No message handlers ;rta#pRn  
 //}}AFX_MSG_MAP YpZ 9h@,  
END_MESSAGE_MAP() 4d'tK^X  
sEfGf.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) NOmSLIgt7  
: CDialog(CCaptureDlg::IDD, pParent) j1toV$)P  
{ 1/q iE{NW  
 //{{AFX_DATA_INIT(CCaptureDlg) %@M/)"k  
  m_bControl = FALSE; fs]Zw mA^  
  m_bAlt = FALSE; &sA6o"h~  
  m_bShift = FALSE;  K[TMTn  
  m_Path = _T("c:\\"); &9] [ ~$  
  m_Number = _T("0 picture captured."); .J\U|r  
  nCount=0; M/sqOhg  
  bRegistered=FALSE; El&pu x2  
  bTray=FALSE; a( {`<F  
 //}}AFX_DATA_INIT &<i>)Ss  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U7fE6&g  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g?o$:>c  
} /[#{#:lo2  
L@R%*-a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I0jEhg%JZ  
{ Iei4yDv ;  
 CDialog::DoDataExchange(pDX); J&:0ytG  
 //{{AFX_DATA_MAP(CCaptureDlg) +TX p;6pA  
  DDX_Control(pDX, IDC_KEY, m_Key); s_h <  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ow`c B  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ;1OTK6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); O,1u\Zy/  
  DDX_Text(pDX, IDC_PATH, m_Path); z06pX$Q.<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); SS~Txt75m  
 //}}AFX_DATA_MAP yxQAO_C  
} \&qVr1|  
^lMnwqx<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (U dDp"/  
//{{AFX_MSG_MAP(CCaptureDlg) f,a4LF  
 ON_WM_SYSCOMMAND() o_*|`E  
 ON_WM_PAINT() WE~3(rs#X#  
 ON_WM_QUERYDRAGICON() N$,)vb<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O-2H!58$)  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^9b `;}).  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +`Bn]e8O  
//}}AFX_MSG_MAP n _ez6{  
END_MESSAGE_MAP() GRV9s9^  
j1iC1=`ZM  
BOOL CCaptureDlg::OnInitDialog() a@r K%Iff  
{ D3lYy>~d5;  
 CDialog::OnInitDialog(); 80]TKf>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ];2eIe  
 ASSERT(IDM_ABOUTBOX < 0xF000); c`}X2u]k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); zXf+ieo  
 if (pSysMenu != NULL) =nL*/  
 { %Z5k8  
  CString strAboutMenu; jh0$:6 `C  
  strAboutMenu.LoadString(IDS_ABOUTBOX); B# H  
  if (!strAboutMenu.IsEmpty()) IFTW,9hh  
  { YXg uw7%\  
   pSysMenu->AppendMenu(MF_SEPARATOR); =K>Z{% i  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I2DmM"-|  
  } aQmL=9  
 } d=KOV;~);  
 SetIcon(m_hIcon, TRUE); // Set big icon *nW9)T  
 SetIcon(m_hIcon, FALSE); // Set small icon 8k`zMT  
 m_Key.SetCurSel(0); d,+n,;6Cf  
 RegisterHotkey(); jb![ Lp  
 CMenu* pMenu=GetSystemMenu(FALSE); i }g xq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t5Mo'*j =  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); d$,i?d,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -pGt ;  
 return TRUE; // return TRUE unless you set the focus to a control J3.Q8f  
} .M{[J]H`t  
.XB] X  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rlIEch^wZ  
{ t3>r f3v  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7h0'R k  
 { BD0-v`  
  CAboutDlg dlgAbout; fDqXM;a"  
  dlgAbout.DoModal(); =GVhAzD3  
 } $B?7u@>,  
 else D5m\u$~V  
 { VfcQibm  
  CDialog::OnSysCommand(nID, lParam); lmcDA,7  
 } `k| nf9_  
} `s_TY%&_}g  
QMxz@HGa|  
void CCaptureDlg::OnPaint() a*[\edcHU  
{ e d*AU,^@v  
 if (IsIconic()) X[~CLKH(  
 { g[jZ A[[  
  CPaintDC dc(this); // device context for painting ggTjd"|)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ibc/x v2  
  // Center icon in client rectangle Xh/av[Q  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,6S 8s  
  int cyIcon = GetSystemMetrics(SM_CYICON); Fb' wC  
  CRect rect; u" g p">  
  GetClientRect(&rect); dR+$7N$  
  int x = (rect.Width() - cxIcon + 1) / 2; kZ9pgdI  
  int y = (rect.Height() - cyIcon + 1) / 2; "\[>@_p h  
  // Draw the icon pzr-}>xrZ  
  dc.DrawIcon(x, y, m_hIcon); !~l%6Z5  
 } zNf5OItx  
 else UIj/Id  
 { dZgfls  
  CDialog::OnPaint(); NLGr=*dq  
 } ^e,RM_.  
} i?/?{p$#a-  
$bosGG  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9p4U\hx  
{ ex+AT;o  
 return (HCURSOR) m_hIcon; 5Z,lWp2A  
} /,UkT*+>!  
j2Y(Q/i  
void CCaptureDlg::OnCancel() ;#i$0~lRl  
{ @GtZK  
 if(bTray) (d#Z-w-  
  DeleteIcon(); SXz([Z{)  
  CDialog::OnCancel(); 3p W MS&  
} ;/T-rVND  
UYOn p7R<  
void CCaptureDlg::OnAbout() 2oG|l!C  
{ I}IW!K  
 CAboutDlg dlg; se HbwO3 b  
 dlg.DoModal(); r![JPhei  
} K>6k@okO  
s*~o%emw  
void CCaptureDlg::OnBrowse() DZ.trtK  
{  0QqzS  
 CString str; u(Sz$eV  
 BROWSEINFO bi; a?~csP^?}  
 char name[MAX_PATH]; ONiI:Z>%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 9lJj/  
 bi.hwndOwner=GetSafeHwnd(); -$t,}3  
 bi.pszDisplayName=name; am+mXb  
 bi.lpszTitle="Select folder"; ha! "BR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9 /(c cj  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); iBC>w+t14  
 if(idl==NULL) !F#aodM1N  
  return; qjzW9yV+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H<}eoU.  
 str.ReleaseBuffer(); :&)/vq  
 m_Path=str; ld}$Tsy0  
 if(str.GetAt(str.GetLength()-1)!='\\') A i){,nh`0  
  m_Path+="\\"; >wO$Vu `t  
 UpdateData(FALSE); 8I0T u  
} oK:P@V6!  
%H@76NvEz  
void CCaptureDlg::SaveBmp() E2H<{Q   
{ WcO,4:  
 CDC dc; _j\=FJz[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); bXwoJ2  
 CBitmap bm; .r5oN+?e  
 int Width=GetSystemMetrics(SM_CXSCREEN); .4FcZJvy  
 int Height=GetSystemMetrics(SM_CYSCREEN); XuoEAu8]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); kseJm+Hc  
 CDC tdc; _I-VWDCk  
 tdc.CreateCompatibleDC(&dc); \nAHpF  
 CBitmap*pOld=tdc.SelectObject(&bm); 2 U`W[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); hUvuq,LH_  
 tdc.SelectObject(pOld); 3;S`<  
 BITMAP btm; S5u#g`I]  
 bm.GetBitmap(&btm); yL x .#kx6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; vSC0D7BlG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OrEuQ-,i@  
 BITMAPINFOHEADER bih; q,+kPhHEgy  
 bih.biBitCount=btm.bmBitsPixel; t`YZ)>Ws  
 bih.biClrImportant=0; aC~n:0 v  
 bih.biClrUsed=0; )1nCw  
 bih.biCompression=0; #3yw   
 bih.biHeight=btm.bmHeight; "=\_++  
 bih.biPlanes=1; 6eYf2sZ;J  
 bih.biSize=sizeof(BITMAPINFOHEADER); =l2Dm  
 bih.biSizeImage=size; _ c ]3nzIr  
 bih.biWidth=btm.bmWidth; 66@3$P%1p  
 bih.biXPelsPerMeter=0; s7nX\:Bw:  
 bih.biYPelsPerMeter=0; h<' 5q&y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Oqpl2Y"/  
 static int filecount=0; -jtC>_/  
 CString name; u@_!mjXQ  
 name.Format("pict%04d.bmp",filecount++); t_>bTcsU  
 name=m_Path+name; dEd]U49u  
 BITMAPFILEHEADER bfh; B5,QJ W*  
 bfh.bfReserved1=bfh.bfReserved2=0; TF0-?vBWh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ryba[Fz4Di  
 bfh.bfSize=54+size; 3 E!<p  
 bfh.bfOffBits=54; `o8{qU,*]N  
 CFile bf; .d~]e2x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !\#Wk0Ku  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %:w% o$  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "4ozlWx  
  bf.WriteHuge(lpData,size); "vOfAo]`  
  bf.Close(); `,Y[Z  
  nCount++; 0YpiHoM  
 } Yl&tkSw46  
 GlobalFreePtr(lpData); fQW_YQsb  
 if(nCount==1) IFrb}yH  
  m_Number.Format("%d picture captured.",nCount); GtM( Y  
 else 7}'A)C>J;  
  m_Number.Format("%d pictures captured.",nCount); Vv yrty  
  UpdateData(FALSE); 33<fN:J]f  
} `!omzE*bk5  
{nQ)4.e6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S}w.#tyEn  
{ @bW[J  
 if(pMsg -> message == WM_KEYDOWN) w~$c= JO#  
 { S@}B:}2  
  if(pMsg -> wParam == VK_ESCAPE) rI<nUy P?  
   return TRUE; ?wLdW1&PpX  
  if(pMsg -> wParam == VK_RETURN) :Dk@?o@2;C  
   return TRUE; Y0PGT5].@'  
 } E +Ujpd  
 return CDialog::PreTranslateMessage(pMsg); OS"{"P  
} ^s2m\Q(  
6i]Nr@1C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z[k#AgC)  
{ [EmOA.6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1J-Qh<Q   
  SaveBmp(); C '-zh\a  
  return FALSE; OHHNWg_5  
} aI={,\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $K?T=a;z  
 CMenu pop; )pjjW"C+  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); WO.0K5nfk  
 CMenu*pMenu=pop.GetSubMenu(0); b$v[@"1  
 pMenu->SetDefaultItem(ID_EXITICON); ntj`+7mw  
 CPoint pt; =|E 09  
 GetCursorPos(&pt); \m=-8KpU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); A \MfF  
 if(id==ID_EXITICON) ` /I bWu  
  DeleteIcon(); !f\?c7  
 else if(id==ID_EXIT) Gpdv]SON{  
  OnCancel(); c{mKra  
 return FALSE; >P\h,1  
} A,m4WO_q3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); DHm[8 Qp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~JwpNJs  
 AddIcon(); b8N[."~:  
 return res; ).NcLJw_  
} CJ9cCtA  
%XJQ0CE<(  
void CCaptureDlg::AddIcon() O->_/_  
{ GSz @rDGY  
 NOTIFYICONDATA data; k-WHHoU>o  
 data.cbSize=sizeof(NOTIFYICONDATA); Qj 6gg  
 CString tip; cc|CC Zl  
 tip.LoadString(IDS_ICONTIP); *.m{jgi1X  
 data.hIcon=GetIcon(0); w0Fwd  
 data.hWnd=GetSafeHwnd(); 1z~k1usRK  
 strcpy(data.szTip,tip); /7k.r}6\R  
 data.uCallbackMessage=IDM_SHELL; zBk_-'z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .vv5 t  
 data.uID=98; FOCoiocPi  
 Shell_NotifyIcon(NIM_ADD,&data); p!+L  
 ShowWindow(SW_HIDE); "_K}rI6(t  
 bTray=TRUE; m<FF$pTT  
} 87^:<\pp  
\npz .g^c_  
void CCaptureDlg::DeleteIcon() W\it+/  
{ ;".z[l*  
 NOTIFYICONDATA data; klgv{_b  
 data.cbSize=sizeof(NOTIFYICONDATA); Ro'jM0(KE  
 data.hWnd=GetSafeHwnd(); Md8(`@`o  
 data.uID=98; |Du,UY/  
 Shell_NotifyIcon(NIM_DELETE,&data); >vlQ|/C  
 ShowWindow(SW_SHOW); ?. zu2  
 SetForegroundWindow(); bK3B3r#$  
 ShowWindow(SW_SHOWNORMAL); |}_gA  
 bTray=FALSE; H1` rM^,%A  
} \#PP8  
<9ma(PFa  
void CCaptureDlg::OnChange() )K{o<m~WAo  
{ ;#3ekl{-g  
 RegisterHotkey(); \s=QiPK  
} Bu7A{DRf  
%6AYCN?Ih  
BOOL CCaptureDlg::RegisterHotkey() luW <V>  
{ h ZoC _\  
 UpdateData(); g-."sniP$g  
 UCHAR mask=0; p1Q/g Il  
 UCHAR key=0; MWM +hk1fs  
 if(m_bControl) |]^l^e 6m  
  mask|=4; R=`U4Ml;  
 if(m_bAlt) 0/ut:RV0  
  mask|=2; SK's!m:r=  
 if(m_bShift) B ,V( LTE  
  mask|=1; saatU;V  
  key=Key_Table[m_Key.GetCurSel()]; 1'NhjL  
 if(bRegistered){ o g_Ri$x8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); RNGO~:k?r  
  bRegistered=FALSE; P,(9cyS{  
 } ~\2;i]|  
 cMask=mask; ucw`;<d8  
 cKey=key; X*0k>j  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); wi>DZkR  
 return bRegistered; SijtTY#r  
} dIma{uv  
/x$}D=(CZ  
  四、小结 g{e/X~  
+<&E3Or  
  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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