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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: F C=N}5u  
  $ ]^Io)}f@  
  一、实现方法 ~P*{%=a  
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  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:  ]l  
SUsdX[byb  
#pragma data_seg("shareddata") _0Y?(}  
HHOOK hHook =NULL; //钩子句柄 #aKUD  
UINT nHookCount =0; //挂接的程序数目 JPg^h  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \e%%ik,<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (>*L-&-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &uf|Le4  
static int KeyCount =0; =}SLQdT  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Hig.` P  
#pragma data_seg() W/%9=g$m  
)k4&S{=  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ~!/agLwY  
 ?H8dyQ5"  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Z07n>|WF-  
LvL2[xh%&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7<X!Xok  
cKey,UCHAR cMask) X0LC:0+  
{ Yv"B-oy  
 BOOL bAdded=FALSE; NK%Ok  
 for(int index=0;index<MAX_KEY;index++){ ,lb}&uZo  
  if(hCallWnd[index]==0){ ]Z [0xs  
   hCallWnd[index]=hWnd; hE4qs~YB!  
   HotKey[index]=cKey; ^Qxv5HS2  
   HotKeyMask[index]=cMask; 5wv7]F<  
   bAdded=TRUE; !'Hd:oD<  
   KeyCount++; =RofC9,  
   break; /9?yw!  
  } 0XA0 b1VX  
 } CH5>u  
 return bAdded; d?/>Qqw:#  
} [4;G^{ bX  
//删除热键 6DC+8I<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =pnQ?2Og  
{ 1buO&q!vn  
 BOOL bRemoved=FALSE; YuoIhT  
 for(int index=0;index<MAX_KEY;index++){ `9acR>00$  
  if(hCallWnd[index]==hWnd){ -NA2+].  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O5*3 qJp  
    hCallWnd[index]=NULL; *\`<=,H6<  
    HotKey[index]=0; ?5j~"  
    HotKeyMask[index]=0; $1k@O@F(4  
    bRemoved=TRUE; <%=<9~e  
    KeyCount--; .(yJ+NU  
    break; nB4+*=$E+-  
   } #jPn7  
  } caV DV  
 } OLqynY  
 return bRemoved; ^RYq !l$  
} qtFHA+bO  
?R4%z2rcW  
n`T4P$pt  
  DLL中的钩子函数如下: Bz>5OuOVS\  
U+!&~C^y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WDt6{5T  
{ S[N9/2  
 BOOL bProcessed=FALSE; ff00s+  
 if(HC_ACTION==nCode) +R;s< pZ^  
 { _SU6Bd/>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 BteeQ&A|~  
   switch(wParam) v <OZ # L$  
   {  a`LkP%  
    case VK_MENU: 3h}i="i   
     MaskBits&=~ALTBIT; 8U!$()^?  
     break; ; {v2s;  
    case VK_CONTROL:  #J  
     MaskBits&=~CTRLBIT; S7~HBgS<  
     break; Mu6DT p~k  
    case VK_SHIFT: >G As&\4hs  
     MaskBits&=~SHIFTBIT; 9q\_UbF  
     break; CW]Th-xc  
    default: //judge the key and send message @\W-=YKLg  
     break; NnaO!QW%  
   } bc>&Qj2Z7c  
   for(int index=0;index<MAX_KEY;index++){ xT!<x({  
    if(hCallWnd[index]==NULL) QH?sx k2  
     continue; QuC_sFP10  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _7dp(R  
    { ,,lR\!>8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jWdZ ]0m  
     bProcessed=TRUE; )RQQhB  
    } pX1Us+%  
   } 0;hn;(V]"  
  } UKPr[  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,RP9v*  
   switch(wParam)  {@k , e  
   { (;-_j /  
    case VK_MENU: 3jHg9M23[^  
     MaskBits|=ALTBIT; J|<C;[du>  
     break; Np/vPaAk  
    case VK_CONTROL: ;WhRDmT  
     MaskBits|=CTRLBIT; (*AJ6BQWa  
     break; "{zqXM}:C  
    case VK_SHIFT: ,qNbo 11  
     MaskBits|=SHIFTBIT; </aQ  
     break;  2IGU{&s  
    default: //judge the key and send message sd =bw  
     break; m)Wq*&,o  
   } }c>vk  
   for(int index=0;index<MAX_KEY;index++){ >P//]nn  
    if(hCallWnd[index]==NULL) xC}'"``s  
     continue; n^*,JL 9@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oA@c.%&  
    { B![:fiR`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {SD%{  
     bProcessed=TRUE; ekqS=KfWl;  
    } A;o({9VH`Z  
   } e>bARK<  
  } ~ H/ZiBL@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 p"j &s  
   for(int index=0;index<MAX_KEY;index++){ DfVJ~,x~  
    if(hCallWnd[index]==NULL) $8SSu|O+x  
     continue; M}q;\}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y/T-q<ag8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PWkSl  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c;zk{dP   
   } |nGv:= H@  
  } O,S>6o)?  
 } -)R =p"-w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $xcZ{C  
} {L [   
[JV?Mdzu  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: S\!vDtD@  
s!>9od6^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W=OryEV?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +;M 5Sp  
< RtyW  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: m9+?>/R  
PZlPC#E-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bm4Bq>*=U  
{ MU\Pggs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #)]/wqPoW  
 { 1b2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =E^/gc%X  
  SaveBmp(); %s^1de  
  return FALSE; uX]]wj-R3  
 } <K,X5ctM}  
 …… //其它处理及默认处理 PsD)]V9%:  
} 0rm(i*Q  
o[i*i<jv-  
'2|P-/jU  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Mc!LC .8  
(U_HX2f  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  yK$aVK"  
,KU%"{6  
  二、编程步骤 'hV(1Mw  
62y:i  
  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"; R0LWuE%eD  
OK YbEn#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; %d%?\jVb  
aAG']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; E'5KJn;_7  
3d4A~!Iz  
  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; O'{kNr{u  
~*<`PDO?  
  5、 添加代码,编译运行程序。 9Oo`4  
q/d?c Lgl  
三、程序代码 yPs6_Qo!p  
>yHtGIHe-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5SmJ'zFO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }maD8,:t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iHK.hs;  
#if _MSC_VER > 1000 1eEML"  
#pragma once }pnp._j  
#endif // _MSC_VER > 1000 " Up(Vj@  
#ifndef __AFXWIN_H__ u3E =r  
#error include 'stdafx.h' before including this file for PCH MI(;0   
#endif ^S?f"''y3  
#include "resource.h" // main symbols }xi?vAaTl  
class CHookApp : public CWinApp V{w &RJ  
{ )Q>Ao.  
 public: 5`gVziS!S  
  CHookApp(); }V`_ (%Q-e  
  // Overrides 7YK6e  
  // ClassWizard generated virtual function overrides >]C/ Q6  
  //{{AFX_VIRTUAL(CHookApp) CDsl)  
 public: noEl+5uY  
  virtual BOOL InitInstance(); V0W4M%  
  virtual int ExitInstance(); " a,4E{7  
  //}}AFX_VIRTUAL !$>b}w'  
  //{{AFX_MSG(CHookApp) *+2_!=4V  
  // NOTE - the ClassWizard will add and remove member functions here. @!O(%0 =  
  // DO NOT EDIT what you see in these blocks of generated code ! |@yYM-;6  
  //}}AFX_MSG  ;Q4,I[?%  
  DECLARE_MESSAGE_MAP() 9=}[~V n  
}; `h'=F(v(}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [{Q$$aV1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f?ibyoXL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8oXp8CC  
BOOL InitHotkey(); ,J-|.ER->  
BOOL UnInit(); p]/[ji  
#endif r|jM;  
$!y^t$u$@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. J YA>Q&  
#include "stdafx.h" hvNK"^\p  
#include "hook.h" m%>}T 75C^  
#include <windowsx.h> ^cSfkBh  
#ifdef _DEBUG $Bl51Vj N  
#define new DEBUG_NEW UnYb}rF#%  
#undef THIS_FILE }4H}*P>+  
static char THIS_FILE[] = __FILE__; WBkx!{\z  
#endif \_6  
#define MAX_KEY 100 75R#gQ]EV  
#define CTRLBIT 0x04 s/s&d pT*  
#define ALTBIT 0x02 wU<j=lY?f  
#define SHIFTBIT 0x01 n:) [ %on  
#pragma data_seg("shareddata") GKSF(Tnj  
HHOOK hHook =NULL; KG9-ac  
UINT nHookCount =0; _~ei1 G.R  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey dv3u<XM~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT W*#5Sk  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G$&jP:2q  
static int KeyCount =0; \[.qN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5|N`:h'9M  
#pragma data_seg() ^Jq('@  
HINSTANCE hins; o$Nhx_F  
void VerifyWindow(); e*PUs  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $Cfp1#  
//{{AFX_MSG_MAP(CHookApp) JMo r[*  
// NOTE - the ClassWizard will add and remove mapping macros here. 8>6<GdGL<n  
// DO NOT EDIT what you see in these blocks of generated code! %N&W_.F6  
//}}AFX_MSG_MAP ID! S}D  
END_MESSAGE_MAP() <)T~_s  
_@[W[= |H  
CHookApp::CHookApp() 6 R})KIG  
{ ilHf5$  
 // TODO: add construction code here, NCG;`B`i  
 // Place all significant initialization in InitInstance 92A9gY  
} #OM)71kB8  
<OKc?[  
CHookApp theApp; 4;CI< &S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SJMbYjn0J  
{ 3W_7xLA  
 BOOL bProcessed=FALSE; q/54=8*h0  
 if(HC_ACTION==nCode) nXoDI1<[  
 { l 'wu-  
  if((lParam&0xc0000000)==0xc0000000){// Key up nqUnDnP2c  
   switch(wParam) r<!nU&FPD:  
   { a|oh Ad  
    case VK_MENU: Yk|.UuXT  
     MaskBits&=~ALTBIT; `67i1w`  
     break; {z0iWY2Xw  
    case VK_CONTROL: Ng*-Bw)p]  
     MaskBits&=~CTRLBIT; aGi`(|shW  
     break; |m"Gr)Gm  
    case VK_SHIFT: ?Z?(ky!  
     MaskBits&=~SHIFTBIT; x4L3Z__  
     break; q{f\_2[  
    default: //judge the key and send message >(.|oT\Tb  
     break; =#y;J(>~|  
   } z |~+0  
   for(int index=0;index<MAX_KEY;index++){ h4|}BGO  
    if(hCallWnd[index]==NULL) K[OOI~"C  
     continue; 4m91XD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nQ+5jGP1  
    { FjtS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); k_wcol,W  
     bProcessed=TRUE; 5 m-/N ?c  
    } $`/UG0rdC  
   } yF.Gz`yi  
  } Pvi2j&W84  
  else if((lParam&0xc000ffff)==1){ //Key down jI*@&3  
   switch(wParam) wS#Uw_[  
   { 2sk7E'2(  
    case VK_MENU: ``:[Jr &  
     MaskBits|=ALTBIT; uyB2   
     break; TaHcvjhR  
    case VK_CONTROL: _LC*_LT_  
     MaskBits|=CTRLBIT; v G\J8s  
     break; 37a1O>A  
    case VK_SHIFT: z+6PVQ  
     MaskBits|=SHIFTBIT; IjRUr\l  
     break; WH1 " HO  
    default: //judge the key and send message GF% /q:9  
     break; uK"FopUJ4i  
   } o^UOkxs.  
   for(int index=0;index<MAX_KEY;index++) sRT H_]c  
   { ppvlU H5;  
    if(hCallWnd[index]==NULL) !8[A;+o3P  
     continue; }s<;YC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?z l<"u  
    { -wV2 79^b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iz`>'wpC  
     bProcessed=TRUE; hB.8\-}QMq  
    } s_fe4K  
   } @!! u>1  
  } ZlMT) ~fM&  
  if(!bProcessed){ n~|?)EL  
   for(int index=0;index<MAX_KEY;index++){ ki@C}T5  
    if(hCallWnd[index]==NULL) H8 ? Y{H  
     continue; ui#nN   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .Hqq!&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); o)@nnqa  
   } kG!hqj  
  } 8_HBcZWs  
 } Nr2,m"R{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i) X~L4gn  
} +<F3}]]  
+<[q"3  
BOOL InitHotkey() uE9,N$\L_  
{ 7R:Ij[dV  
 if(hHook!=NULL){ y _"V=:  
  nHookCount++; Q}lCQK/g  
  return TRUE; P<vU!`x% q  
 } @- |G_BZ  
 else S 4 17.n  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U~7udUR  
  if(hHook!=NULL) V^[&4  
   nHookCount++; wW\@^5  
  return (hHook!=NULL); P* 0kz@  
} {zm8`  
BOOL UnInit() A"b31*_  
{ qQ3Q4R\  
 if(nHookCount>1){ q/I( e  
  nHookCount--; ;2`6eyr  
  return TRUE; 7A(4`D J  
 } 0Pf88'6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); p$1 'e,G  
 if(unhooked==TRUE){ "ufSHrZv  
  nHookCount=0; Z@Q*An  
  hHook=NULL; LS<+V+o2%  
 } k"DZ"JC  
 return unhooked; CA`V)XIsP  
} }O@>:?U  
GyQFR?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /K&9c !]$C  
{ O5p$ A @  
 BOOL bAdded=FALSE; e3CFW_p  
 for(int index=0;index<MAX_KEY;index++){ ky[Cx!81C  
  if(hCallWnd[index]==0){ z[_Y,I  
   hCallWnd[index]=hWnd; C$+Q,guM  
   HotKey[index]=cKey; Z!|r>  
   HotKeyMask[index]=cMask; c{y'&3\  
   bAdded=TRUE; |f$+|9Q?  
   KeyCount++; jH<Sf: Y(  
   break; # 2^H{7  
  } #`|Nm3b  
 } V9"R8*@-  
 return bAdded; 3R%JmLM+R9  
} w(ZZTVW-  
R)Mkt8v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O[MFp  
{ RNB&!NC  
 BOOL bRemoved=FALSE; }9\6!GY0  
 for(int index=0;index<MAX_KEY;index++){ e Fz$h2*B  
  if(hCallWnd[index]==hWnd){ 4_QfM}Fyp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t.;._'  
    hCallWnd[index]=NULL; =T2SJ)  
    HotKey[index]=0; aanS^t0  
    HotKeyMask[index]=0; oz=ULPZ%  
    bRemoved=TRUE; O8\f]!O(  
    KeyCount--; :~"m yn,  
    break; d"-I^|[OM  
   } Ff/Ap&0+  
  } mTX:?>  
 } GV1Ol^  
 return bRemoved; (VM CVZ  
} Q<V1`e  
XTF[4#WO  
void VerifyWindow() RA<ky*^dr  
{ nn:'<6"oV  
 for(int i=0;i<MAX_KEY;i++){ dX1jn;7  
  if(hCallWnd!=NULL){ SceHdx(]  
   if(!IsWindow(hCallWnd)){ $)ka1L"N  
    hCallWnd=NULL; I[K4/91  
    HotKey=0; AH'c:w]~  
    HotKeyMask=0; Fw-Rv'\  
    KeyCount--; w"[T  
   } Ar >JQ@0  
  } %zGv+H?  
 } ~Oq _lM  
} 7M~/ q.  
?C fQwY#N  
BOOL CHookApp::InitInstance() }W 5ks-L6  
{ u5Z yOZ;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @u/CNx,`X  
 hins=AfxGetInstanceHandle(); 9;{(.K  
 InitHotkey(); c8mh#T bl  
 return CWinApp::InitInstance(); <]G'& iv>  
} "A Bt  
T_Tu>wQX  
int CHookApp::ExitInstance() !~?/D  
{ "0PsCr}!  
 VerifyWindow(); {u y^Bui}  
 UnInit(); b?`2LAgn  
 return CWinApp::ExitInstance(); #|je m   
} $6UU58>n  
; ,sNRES3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .E^w, o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 80Hi v  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g!_#$az3  
#if _MSC_VER > 1000 cFq<x=S  
#pragma once VV1sadS:S`  
#endif // _MSC_VER > 1000 &D{!zF  
ZlC+DXg#S  
class CCaptureDlg : public CDialog Hm'fK$y(  
{ "TaLvworb4  
 // Construction *8,W$pe3  
 public: B`R@%US  
  BOOL bTray; )N- '~<N  
  BOOL bRegistered; L$O\fhO?  
  BOOL RegisterHotkey(); |0}Xb|+  
  UCHAR cKey; T\p>wiY2|F  
  UCHAR cMask; `!N}u  
  void DeleteIcon(); ? Pi|`W   
  void AddIcon(); 5%9Uh'y#  
  UINT nCount; Go c*ugR  
  void SaveBmp(); %.`u2'^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor a"YVr'|  
  // Dialog Data 9jf9 u0  
  //{{AFX_DATA(CCaptureDlg) V]J"v#!{  
  enum { IDD = IDD_CAPTURE_DIALOG }; D<FQVdP  
  CComboBox m_Key; WynTU?  
  BOOL m_bControl; .F@Lx45  
  BOOL m_bAlt; en{p<]H  
  BOOL m_bShift; `qmwAT  
  CString m_Path; 6 L4\UT r  
  CString m_Number; <?IDCOt ?  
  //}}AFX_DATA %E@o8  
  // ClassWizard generated virtual function overrides c.LRS$o/j  
  //{{AFX_VIRTUAL(CCaptureDlg) iT{4-j7|P4  
 public: `. JW_F)1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); y>t:flD*  
 protected: &uE )Vr4R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N`IXSE  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~),%w*L  
  //}}AFX_VIRTUAL /y{fDCC  
  // Implementation ?,riwDI 2  
 protected: ;0kAm Vy  
  HICON m_hIcon; V*s\~h)  
  // Generated message map functions nHbi{,3  
  //{{AFX_MSG(CCaptureDlg) T=pP  
  virtual BOOL OnInitDialog(); _J \zj  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U3B&3K} ~  
  afx_msg void OnPaint(); X1P1 $RdkR  
  afx_msg HCURSOR OnQueryDragIcon(); 4.,|vtp  
  virtual void OnCancel(); ^kcuRJ0*$  
  afx_msg void OnAbout(); 8i;drvf  
  afx_msg void OnBrowse(); {ST8'hY  
  afx_msg void OnChange(); ZMMx)}hS  
 //}}AFX_MSG ec#`9w$  
 DECLARE_MESSAGE_MAP()  gh[q*%#  
}; 3O*iv{-&  
#endif *>qc6d@'  
%KO8 i)n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5s^vC2$)  
#include "stdafx.h" Wx3DWY;  
#include "Capture.h" r]xN&Ne5Q  
#include "CaptureDlg.h" N9d^;6;i  
#include <windowsx.h> [-l>f P0  
#pragma comment(lib,"hook.lib") 8g{Mv#b%  
#ifdef _DEBUG <!G /&T  
#define new DEBUG_NEW sdCG}..`  
#undef THIS_FILE V}<<?_  
static char THIS_FILE[] = __FILE__; fFbJE]jW  
#endif P]}:E+E<.I  
#define IDM_SHELL WM_USER+1 11QZ- ^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j^b &Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \M.?*p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4Yok,<  
class CAboutDlg : public CDialog dbEXl m  
{ -}T7F+  
 public: K'8?%&IQ  
  CAboutDlg(); 4IW90"uc  
  // Dialog Data 7lF;(l^Z>}  
  //{{AFX_DATA(CAboutDlg) l<=k#d  
  enum { IDD = IDD_ABOUTBOX }; tq}sedYhee  
  //}}AFX_DATA 6v:L8 t$"  
  // ClassWizard generated virtual function overrides * wqR.n?  
  //{{AFX_VIRTUAL(CAboutDlg) _G-6G=q  
 protected: VWdTnu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Tg@G-6u0c  
  //}}AFX_VIRTUAL .Gr"| uII  
  // Implementation 3nhQ^zqf  
 protected: . &}x[~g  
  //{{AFX_MSG(CAboutDlg) J:uFQWxZ   
  //}}AFX_MSG D6e?J.  
  DECLARE_MESSAGE_MAP() 0[ "CP:u  
}; hA/Es?U]  
3VMaD@nYa  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _]'kw [  
{ U<XfO'XJ  
 //{{AFX_DATA_INIT(CAboutDlg) GfP'  
 //}}AFX_DATA_INIT ?6vGE~ MuR  
} 7!`1K_v6  
%CQa8<q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gJwX  
{ UjunIKX+  
 CDialog::DoDataExchange(pDX); M^l%*QF[,q  
 //{{AFX_DATA_MAP(CAboutDlg) !T)_(}|6}  
 //}}AFX_DATA_MAP mg70%=qM0f  
} j4@6`[n:  
*R4=4e2#S  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .u7grC C  
 //{{AFX_MSG_MAP(CAboutDlg) v%`k*n':  
 // No message handlers E<B/5g!  
 //}}AFX_MSG_MAP m#Z9wf] F  
END_MESSAGE_MAP() (mi=I3A(  
F @t\D?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B[w.8e5  
: CDialog(CCaptureDlg::IDD, pParent) h }&dvd  
{ WQw11uMt@q  
 //{{AFX_DATA_INIT(CCaptureDlg) r#ADxqkaV  
  m_bControl = FALSE; qS}{O0  
  m_bAlt = FALSE; ""V\hHdp  
  m_bShift = FALSE; :& $v.#  
  m_Path = _T("c:\\"); I`@>v%0  
  m_Number = _T("0 picture captured."); H_Hr=_8}-  
  nCount=0; Gyi0SM6v5&  
  bRegistered=FALSE; &kWT<*;J)  
  bTray=FALSE; M9VAs~&S  
 //}}AFX_DATA_INIT FDBNKQV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .gRb'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9XS>;<"2  
} `tHF}  
=VWH8w.3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) YyYp-0#  
{ 6x!iL\Y~  
 CDialog::DoDataExchange(pDX); %dmQmO,  
 //{{AFX_DATA_MAP(CCaptureDlg) I L&PN`#  
  DDX_Control(pDX, IDC_KEY, m_Key); u[wDOw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZZxt90YR'5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gHL:XW^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); A5}N[|z  
  DDX_Text(pDX, IDC_PATH, m_Path); ==KDr 0|G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y?oeP^V'u  
 //}}AFX_DATA_MAP 2I=4l  
} )h(=X&(d  
8-L -W[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) |a0@4 :  
//{{AFX_MSG_MAP(CCaptureDlg) p4uObK,  
 ON_WM_SYSCOMMAND() 2B6y1"B  
 ON_WM_PAINT() >"zN`  
 ON_WM_QUERYDRAGICON() +r"fv*g"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) lYm00v6y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0|\A5 eG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) nGJ+.z  
//}}AFX_MSG_MAP U; #v-'Z  
END_MESSAGE_MAP() 'vZWk eo  
|F =.NY  
BOOL CCaptureDlg::OnInitDialog() 0eA |Uq~  
{ Fv^>^txh  
 CDialog::OnInitDialog(); qssK0!-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); se_Oi$VZ{  
 ASSERT(IDM_ABOUTBOX < 0xF000); uqBVKE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T%PUV \LV  
 if (pSysMenu != NULL) HXB & 6  
 { nob}}w]~C  
  CString strAboutMenu; {*F8'6YQ$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >#;>6q9_  
  if (!strAboutMenu.IsEmpty()) `apCu  
  { i|!R*"  
   pSysMenu->AppendMenu(MF_SEPARATOR); BQgK<_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M;.:YkrUH  
  } 7Sycy#D  
 } p{0rHu[  
 SetIcon(m_hIcon, TRUE); // Set big icon "GxQ9=Z  
 SetIcon(m_hIcon, FALSE); // Set small icon N40DL_-  
 m_Key.SetCurSel(0); 6D4u?P,  
 RegisterHotkey(); `Z@qWB<  
 CMenu* pMenu=GetSystemMenu(FALSE); w/ID y Q  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Jd|E 4h~(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <5|:QLqy  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >/-Bg:  
 return TRUE; // return TRUE unless you set the focus to a control ,F|49i.K  
} %:-2P  
A22'qgKm@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dP/1E6*m  
{ ~NK|q5(I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8(:O5#  
 { `q y@Qo  
  CAboutDlg dlgAbout; Q,o"[ &Gp  
  dlgAbout.DoModal(); f Lns^  
 } UtB~joaR  
 else +4]f6Zz({  
 { SUoUXh^!w  
  CDialog::OnSysCommand(nID, lParam); R36A_  
 } ?[X^'zz}  
} 5.U|CL  
0*/[z~Z-1  
void CCaptureDlg::OnPaint() QyEoWKu;  
{ pc](  
 if (IsIconic()) `jGG^w3  
 { l4E0/ F  
  CPaintDC dc(this); // device context for painting cD<5~`l  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~5~Cpu2v7  
  // Center icon in client rectangle =%crSuP  
  int cxIcon = GetSystemMetrics(SM_CXICON); #t&L}=G{%  
  int cyIcon = GetSystemMetrics(SM_CYICON); @w;&:J9m  
  CRect rect; P[gYENQ   
  GetClientRect(&rect); kK]L(ZU +  
  int x = (rect.Width() - cxIcon + 1) / 2; T$Rf  
  int y = (rect.Height() - cyIcon + 1) / 2; to] ~$~Q|>  
  // Draw the icon Ij7[2V]c  
  dc.DrawIcon(x, y, m_hIcon); KA9v?_@{F  
 } D;oX*`  
 else E*UE?4FSw|  
 { ]6?6 k4@  
  CDialog::OnPaint(); @t#Ju1Y  
 } jH2_Ekgc;_  
} N MH'4R  
CGZ3-OW@E  
HCURSOR CCaptureDlg::OnQueryDragIcon() z dUSmb  
{ p,S/-ph  
 return (HCURSOR) m_hIcon; U;Q?Rh- W  
} Z2I2 [pA  
G9 ra;.  
void CCaptureDlg::OnCancel() ?Lquf&`vP  
{ `mDCX  
 if(bTray) 6"U$H$i.G  
  DeleteIcon(); `R_;n#3F0  
  CDialog::OnCancel(); iq`caoi  
} 5}'W8gV?  
Nb/Z+  
void CCaptureDlg::OnAbout() vqJq=\ .m  
{ }m.45n/  
 CAboutDlg dlg; >B+!fi'SS>  
 dlg.DoModal(); B5/"2i  
} 43BqNQ0  
D'\gy$9m1  
void CCaptureDlg::OnBrowse() GNI:k{H@"?  
{ Ou2p^:C(  
 CString str; 6fw2 ;$x"  
 BROWSEINFO bi; F+m;y  
 char name[MAX_PATH]; -h,?_d>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y/,Cy0!  
 bi.hwndOwner=GetSafeHwnd(); N9BfjT}  
 bi.pszDisplayName=name; ee .,D  
 bi.lpszTitle="Select folder"; !,cfA';S  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?%i~~hfH#N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1C<@QrT  
 if(idl==NULL) '"]U+aIg  
  return; (Ujry =f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7) Qq  
 str.ReleaseBuffer(); Amj'$G|+hj  
 m_Path=str; / yTPb  
 if(str.GetAt(str.GetLength()-1)!='\\')  t'e5!Ma  
  m_Path+="\\"; DDp\*6y3l  
 UpdateData(FALSE); t,308Z  
} h=MEQ-3jg  
- ~`)V`@  
void CCaptureDlg::SaveBmp() 18G=j@k7  
{ RfzYoBN  
 CDC dc; 9%^O-8!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); AkVgFQg" n  
 CBitmap bm; _'Hw` 0}s  
 int Width=GetSystemMetrics(SM_CXSCREEN); .CBb%onx  
 int Height=GetSystemMetrics(SM_CYSCREEN); E8b:MY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); aJ$({ZN\#  
 CDC tdc; jF0>w  m  
 tdc.CreateCompatibleDC(&dc); gE~LPwM  
 CBitmap*pOld=tdc.SelectObject(&bm); ow K)]t  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `-w;/A"MJ  
 tdc.SelectObject(pOld); CsiRM8  
 BITMAP btm; H[U"eS."  
 bm.GetBitmap(&btm); NWII?X#T}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; F4 =V* /7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >|g(/@IO  
 BITMAPINFOHEADER bih; a<l DT_2b  
 bih.biBitCount=btm.bmBitsPixel; 7&vDx=W  
 bih.biClrImportant=0; :r}C&3  
 bih.biClrUsed=0; )H[Pz.'ah0  
 bih.biCompression=0; Oc%W_Gb7  
 bih.biHeight=btm.bmHeight; *apkw5B}C  
 bih.biPlanes=1; ^D A<=C-[!  
 bih.biSize=sizeof(BITMAPINFOHEADER); t-)d*|2n}o  
 bih.biSizeImage=size; ;]^% 6B n  
 bih.biWidth=btm.bmWidth; dnCurWjdk  
 bih.biXPelsPerMeter=0; .g!K| c  
 bih.biYPelsPerMeter=0; ZFRKzPc {V  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 80 ckh  
 static int filecount=0; Oz Axnd\.N  
 CString name; 5 N:IH@  
 name.Format("pict%04d.bmp",filecount++); $Ahe Vps@@  
 name=m_Path+name; G]O5irsV  
 BITMAPFILEHEADER bfh; V$3`y=8  
 bfh.bfReserved1=bfh.bfReserved2=0; w L4P-4'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); q0VR&b`?>D  
 bfh.bfSize=54+size; QfRo`l/V9  
 bfh.bfOffBits=54; 63Z^ k(  
 CFile bf; !AN;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /^=8?wK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Nf)$K'/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); PUErvL t  
  bf.WriteHuge(lpData,size); >1RL5_US  
  bf.Close(); '>[Ut@lT;  
  nCount++; arN=OB  
 } % !Ih=DZ  
 GlobalFreePtr(lpData); -|4 Oq  
 if(nCount==1) R$i-%3  
  m_Number.Format("%d picture captured.",nCount); )8;At'q}  
 else du_~P"[  
  m_Number.Format("%d pictures captured.",nCount); N."x@mV  
  UpdateData(FALSE); d8K|uEHVz  
} . :~E.b  
40}7O<9*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [I`:%y  
{ -9(pOwN |m  
 if(pMsg -> message == WM_KEYDOWN) kbZpi`w  
 { ]Wtg.y6;  
  if(pMsg -> wParam == VK_ESCAPE) lESv  
   return TRUE; ^o4](l  
  if(pMsg -> wParam == VK_RETURN) &1ZUMc  
   return TRUE; u9N /9  
 } NiD_v  
 return CDialog::PreTranslateMessage(pMsg); 'zOB!QqA`v  
} HYl~)O>  
k5)a|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _fS4a134R  
{ 2 ])e}& i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |!{ Y:f;  
  SaveBmp(); `N8t2yF  
  return FALSE; }VeE4-p B  
} (#8B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z0@BBXQ`  
 CMenu pop; ox5WboL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); V&7NN=  
 CMenu*pMenu=pop.GetSubMenu(0); Q hdG(`PY~  
 pMenu->SetDefaultItem(ID_EXITICON); DhXV=Qw  
 CPoint pt; UjS+Ddp  
 GetCursorPos(&pt); YP>J'{?b*"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZmmX_!M  
 if(id==ID_EXITICON) zxkO&DGRbN  
  DeleteIcon(); ~I;|ipK4m  
 else if(id==ID_EXIT) %F\.1\&eE  
  OnCancel(); 7[I +1  
 return FALSE; 2"_5Yyb  
} zwk& 3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O_L>We@3E  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a[p$e?gka  
 AddIcon(); 2S-f5&o  
 return res; #_WkV  
} N5zx#g  
-F_c Bu81V  
void CCaptureDlg::AddIcon() `\GR Y @cg  
{ 3n~O&{  
 NOTIFYICONDATA data; qiH)J- ~GZ  
 data.cbSize=sizeof(NOTIFYICONDATA); J&&)%&h'I  
 CString tip; 88l1g,`**  
 tip.LoadString(IDS_ICONTIP); u;+8Jg+xH/  
 data.hIcon=GetIcon(0); RAWzQE }  
 data.hWnd=GetSafeHwnd(); _|T{2LvwT  
 strcpy(data.szTip,tip); \i+Ad@)  
 data.uCallbackMessage=IDM_SHELL; *Qyu QF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &4ndi=.#rg  
 data.uID=98; (I/ iD.A  
 Shell_NotifyIcon(NIM_ADD,&data); ]- _ ma  
 ShowWindow(SW_HIDE); "z*.Bk  
 bTray=TRUE; _}F _Q5)  
} }QBL{\E!  
Xk\IO0GF  
void CCaptureDlg::DeleteIcon() uh`5:V  
{ BS(jC  
 NOTIFYICONDATA data; ~'F.tB  
 data.cbSize=sizeof(NOTIFYICONDATA); (4?^X  
 data.hWnd=GetSafeHwnd(); =cO5Nt  
 data.uID=98; IwRP,MQ~  
 Shell_NotifyIcon(NIM_DELETE,&data); rgDl%X2B  
 ShowWindow(SW_SHOW); >@Pw{Zh$  
 SetForegroundWindow(); e4|a^lS;  
 ShowWindow(SW_SHOWNORMAL); c-_1tSh}  
 bTray=FALSE; P+BGCc%);B  
} Kp^"<%RT  
5h|aX  
void CCaptureDlg::OnChange() ix$ ^1(  
{ >'4$g7o,  
 RegisterHotkey(); B):ZX#  
} 9MH;=88q  
^+~ 5\c*  
BOOL CCaptureDlg::RegisterHotkey() (<rE1w2s:  
{ 'n=bQ"bQu  
 UpdateData(); yEk|(6+^  
 UCHAR mask=0; ^VW]Qr!  
 UCHAR key=0; Bh'!aipk  
 if(m_bControl) &xA>(|a\&-  
  mask|=4; vxOnv8(  
 if(m_bAlt) (E7"GJ  
  mask|=2; EIfqRRTA  
 if(m_bShift) y4l-o  
  mask|=1; H4sW%nZ0  
  key=Key_Table[m_Key.GetCurSel()]; m(o`;  
 if(bRegistered){  ;u [:J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #!E`%' s]  
  bRegistered=FALSE; nCQ".G  
 } E 0/>E  
 cMask=mask; #-PMREgO  
 cKey=key; |?ZU8I^vW  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mln4Vl(l2M  
 return bRegistered; WrcmC$ff  
}  + K`.ck  
crOSr/I$  
  四、小结 5*+DN U@  
'J3yJ{  
  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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