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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: 02;'"EmP$  
  mv:@D  
  一、实现方法 ;~:Z~8+{c  
,^c-}`!K  
  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: Uz_ob9l<#H  
D.{vuftu  
#pragma data_seg("shareddata") qbq2Bi'a  
HHOOK hHook =NULL; //钩子句柄 HLDv{G'7  
UINT nHookCount =0; //挂接的程序数目 \[{8E}_"^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 P{K\}+9F   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5 ,MM`:{{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey yO7H!}y_  
static int KeyCount =0; :!Q(v(M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JJ)  
#pragma data_seg() VO:  
Cj~e` VRhk  
  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。 W895@  
e"^WXP.t&  
  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: /'DAB**  
+sn0bi/rG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR xM<aQf\j  
cKey,UCHAR cMask) OCdX'HN5Y  
{ ;U?=YSHk7  
 BOOL bAdded=FALSE; 0AWxU?$A4  
 for(int index=0;index<MAX_KEY;index++){ "B__a(  
  if(hCallWnd[index]==0){ }o!b3*#  
   hCallWnd[index]=hWnd; sYXLVJ>b  
   HotKey[index]=cKey; ?E!M%c@,  
   HotKeyMask[index]=cMask; ]#shuZ##>0  
   bAdded=TRUE; \ky oA Z  
   KeyCount++; OjffN'a+N  
   break; -:_3N2U=+  
  } b)Nd}6}<?  
 } a U.3  
 return bAdded; %u9 Q`  
} Mj>Q V(L8t  
//删除热键 /V+7:WDj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k}g4?  
{ G L0P&$h  
 BOOL bRemoved=FALSE; aO inD  
 for(int index=0;index<MAX_KEY;index++){ R$u1\r1I  
  if(hCallWnd[index]==hWnd){ F7C+uG Ts  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4Hf'/%kW  
    hCallWnd[index]=NULL; ux^rF  
    HotKey[index]=0; 5#f_1 V  
    HotKeyMask[index]=0; fGe ie m  
    bRemoved=TRUE; 1 Lg{l  
    KeyCount--; &k*oG: J3  
    break; = =pQ V[  
   } )g8Kicox5  
  } $HOe){G  
 } b (H J|  
 return bRemoved; wG s'qL"z  
} _M8'~$Sg  
EVqqOp1$v4  
eW<NDI&b  
  DLL中的钩子函数如下: )xU+M{p-os  
6X'0 T}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k f Y;  
{ Xajt][  
 BOOL bProcessed=FALSE; wU'+4N".  
 if(HC_ACTION==nCode) J=kf KQV  
 { fA1{-JzV<4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 VPO~veQ  
   switch(wParam) L"1AC&~ u  
   {  =`(W^&|  
    case VK_MENU: P(b~3NB)  
     MaskBits&=~ALTBIT; $rQ7"w J  
     break; } @3q;u)  
    case VK_CONTROL: \goiW;b  
     MaskBits&=~CTRLBIT; Zonn  
     break; PL31(!`@d  
    case VK_SHIFT: N8x&<H  
     MaskBits&=~SHIFTBIT; .P5' \  
     break; MR4k#{:w  
    default: //judge the key and send message Y>c+j  
     break; 73u97oe>1  
   } }3WP:Et  
   for(int index=0;index<MAX_KEY;index++){ Ht}?=ZzW  
    if(hCallWnd[index]==NULL) v`Y{.>[H[  
     continue; Vy/G-IASb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $mAyM+ ph[  
    { dqB N_P%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /9SoVU8  
     bProcessed=TRUE; \AI-x$5R*  
    } 7$0bgWi  
   } o+k*ia~Fa  
  } =_N $0  
  else if((lParam&0xc000ffff)==1){ //有键按下 !w/fw Oo  
   switch(wParam) u!+;Iy7  
   { o)b-fAd@$  
    case VK_MENU: `l70i2xcj  
     MaskBits|=ALTBIT; V#Y"0l+~  
     break; V4Qy^nn1  
    case VK_CONTROL: "85)2*+  
     MaskBits|=CTRLBIT; e1V1Ae  
     break; u^'X>n)oL#  
    case VK_SHIFT: +o,f:Ih  
     MaskBits|=SHIFTBIT; %)d7iT~M  
     break; ' qT\I8%  
    default: //judge the key and send message 9zx9t  
     break; p74Nd4U$s  
   } Hd-g|'^K  
   for(int index=0;index<MAX_KEY;index++){ 805oV(-  
    if(hCallWnd[index]==NULL) 4kV$JV.l  
     continue;  (t@!0_5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C*RPSk  
    { e`JWY9%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N3KI6p6\  
     bProcessed=TRUE; hhU\$'0B-  
    } 5}5oj37x  
   } z wwJyy%/  
  } nu|,wE!i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 C(>g4.-p8  
   for(int index=0;index<MAX_KEY;index++){ XXwo(trs~=  
    if(hCallWnd[index]==NULL) g&. OJ  
     continue; NTCFmdbs 6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZcHIk{|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t1yfSStp  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >@a7Zzl0H  
   } 77+3CME{'  
  } @x[A ^  
 } z.h;}QRJ,@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \j.l1O  
} T.%yeJiE  
JXt_  
  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: Ck m:;q  
aehB,l0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "?iyvzo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K,PN:  
-~_|ZnuM9  
  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: y>T>  
s`v$r,N0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y La E]  
{ M U '-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ,@M<O!%Cs  
 {  r/)ZKO,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Azr|cKu]  
  SaveBmp(); d}|z+D  
  return FALSE; rAqS;@]0  
 } QaA?UzB  
 …… //其它处理及默认处理 5xj8^W^G9  
} ?V~vP%1  
+RiI5.$=Z  
q^ &r<i  
  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。 z/WGL  
X -=M>H^  
  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。 c|k(_#\B  
Ff =%eg]  
  二、编程步骤 VKlC`k8L  
7G Erh,  
  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"; `6#s+JA[  
BbL]0i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GZuWA a  
BT$Oh4y4  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; KP>1%ap6  
2r+nr  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;  %(K}1[  
'|Lv -7  
  5、 添加代码,编译运行程序。 f|/ ,eP$  
g"c7$  
三、程序代码 H,7!"!?@N  
(_3'nFg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wQ9@ l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) LZ&I<ID`-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ udc9KuR@  
#if _MSC_VER > 1000 1#fR=*ZM"  
#pragma once TnKOr~@*  
#endif // _MSC_VER > 1000 PJ<qqA`!  
#ifndef __AFXWIN_H__ ,Qo:]Mj  
#error include 'stdafx.h' before including this file for PCH xwHE,ykE  
#endif c7WOcy@M  
#include "resource.h" // main symbols d6??OO=~>M  
class CHookApp : public CWinApp A9J{>f  
{ ]F;1l3I-  
 public: \F+".X#jh  
  CHookApp(); Ul 85-p  
  // Overrides LN5q_ZvR  
  // ClassWizard generated virtual function overrides ~6QV?j  
  //{{AFX_VIRTUAL(CHookApp) OJM2t`}_t  
 public: 9q[[ ,R  
  virtual BOOL InitInstance(); Are0Nj&?  
  virtual int ExitInstance(); \CS4aIp  
  //}}AFX_VIRTUAL n!Y}D:6c6  
  //{{AFX_MSG(CHookApp) xbHI 4A"Z  
  // NOTE - the ClassWizard will add and remove member functions here. hKnV=Ha(  
  // DO NOT EDIT what you see in these blocks of generated code ! !tx.2m*5  
  //}}AFX_MSG mjk<FXW  
  DECLARE_MESSAGE_MAP() ![]6| G&  
}; ip*^eS^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4/ q BD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +Oo-8f*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;'[?H0Jw'  
BOOL InitHotkey(); y~M 6  
BOOL UnInit(); %t74*cX  
#endif M[-/&;`f@  
fwUF5Y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $DnR[V}rR!  
#include "stdafx.h" `/i/AZ{  
#include "hook.h" ^AXH}g  
#include <windowsx.h> _c:th{*  
#ifdef _DEBUG 8A-*MU`+  
#define new DEBUG_NEW 9.#")%_p  
#undef THIS_FILE #8BI`.t)j  
static char THIS_FILE[] = __FILE__;  R; &k/v  
#endif hD,|CQ  
#define MAX_KEY 100 D+q z`  
#define CTRLBIT 0x04 [;:ocy  
#define ALTBIT 0x02 CkV -L4Jq  
#define SHIFTBIT 0x01 NH=@[t) P,  
#pragma data_seg("shareddata") iex]J@=e  
HHOOK hHook =NULL; =n@\m <  
UINT nHookCount =0; W,!7_nl"u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey i!(5y>I_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT J?4dafkw  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey CalW J  
static int KeyCount =0; %*gg6Q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |'x"+x   
#pragma data_seg() muFWFq&yP  
HINSTANCE hins; BmYX8j]  
void VerifyWindow(); }%42Ty  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *#?9@0b@  
//{{AFX_MSG_MAP(CHookApp) ;DKJ#tS}"  
// NOTE - the ClassWizard will add and remove mapping macros here. 6Tm7|2R  
// DO NOT EDIT what you see in these blocks of generated code! dAOJ: @y  
//}}AFX_MSG_MAP Kf,AnKkn'  
END_MESSAGE_MAP() hm<:\(q  
?Ho>  
CHookApp::CHookApp() cqm:[0Xf5>  
{ jj ' epbA  
 // TODO: add construction code here, [?$tu%Q(Z  
 // Place all significant initialization in InitInstance 23Q 88z   
} K,*z8@  
CqU^bVs  
CHookApp theApp; :n%&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $_\x}`c~.  
{ \E05qk_;K  
 BOOL bProcessed=FALSE; tk:G6Bkid  
 if(HC_ACTION==nCode) Bc b '4*:  
 { XCXX(8To0=  
  if((lParam&0xc0000000)==0xc0000000){// Key up "zqa:D26  
   switch(wParam) QWC C  
   { A.$P1zwC  
    case VK_MENU: )N\B C  
     MaskBits&=~ALTBIT; /paZJ}Pr.  
     break; G}}Lp~  
    case VK_CONTROL: sEL0h4  
     MaskBits&=~CTRLBIT; ]-;JHB5A_:  
     break; zq3f@xOK  
    case VK_SHIFT: 'jy e*  
     MaskBits&=~SHIFTBIT; "Rtt~["%  
     break; <HpUP!q8v  
    default: //judge the key and send message Ufor>  
     break; W!+=`[Ff  
   } ;Uy}(  
   for(int index=0;index<MAX_KEY;index++){ r-]%R:U*  
    if(hCallWnd[index]==NULL) )?6%d  
     continue; ={o)82LV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '0I>  
    { O+=}x]q*y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :C={Z}t/F  
     bProcessed=TRUE; |~rKDc  
    } {yd(n_PqY  
   } D )Jac@,0  
  } <P]%{msGH  
  else if((lParam&0xc000ffff)==1){ //Key down O+[s4]  
   switch(wParam) _U^G*EqL*  
   { vCOtED*<  
    case VK_MENU: 2gEF$?+q?  
     MaskBits|=ALTBIT; kcMg`pJ4<  
     break; z"FxKN~Z  
    case VK_CONTROL: %<U0  
     MaskBits|=CTRLBIT; )gAqWbkB  
     break; Kt/:caD  
    case VK_SHIFT: RfT)dS+rAh  
     MaskBits|=SHIFTBIT; 4<f^/!9w  
     break; g\iSc~%?  
    default: //judge the key and send message Lnq CHe  
     break; .4<lw  
   } f<'D?d)L^  
   for(int index=0;index<MAX_KEY;index++) HJlxpX$_  
   { _|;{{8*?  
    if(hCallWnd[index]==NULL) z 8#{=e  
     continue; 7>AM zNj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D^f;X.Qm  
    { ,,7hVw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4VC8#x1  
     bProcessed=TRUE; q_"w,28  
    } Ies` !W^  
   } \}YAQ'T  
  } m5, &;~  
  if(!bProcessed){ \H1t<B,  
   for(int index=0;index<MAX_KEY;index++){ Tiimb[|  
    if(hCallWnd[index]==NULL) #GUD^#Jh  
     continue; ]AN%#1++U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wb##|XyK<c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <vxTfE@>bp  
   } }2Y`Lr  
  } (''w$qq"D  
 } 7=qvu&{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9j5-/   
} 3[ xHY@c  
K=pG,[ChA  
BOOL InitHotkey() ^nDa-J$  
{ ~4mRm!DP  
 if(hHook!=NULL){ UoSc<h|  
  nHookCount++; 8~|v:qk  
  return TRUE; VAe[x `  
 } >Qg-dJt[  
 else D/,(xWaT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1Cw$^jd  
  if(hHook!=NULL) q &S@\b  
   nHookCount++; O2U}jHsd  
  return (hHook!=NULL); pkTVQdtRG  
} b%d,X-3  
BOOL UnInit() `v'yGsIV  
{ ^E~1%Md.  
 if(nHookCount>1){ W[>qiYf^b  
  nHookCount--; e-VGJxR  
  return TRUE; 7=&+0@R#/d  
 } ;*=7>"o'`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K%u>'W  
 if(unhooked==TRUE){ v`p@djM  
  nHookCount=0; (aq-aum-I  
  hHook=NULL; 4i<GqG  
 } #wkSru&LS  
 return unhooked; QcjsQTAbk  
}  2 av=W  
}U%T6~_wR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c}H}fyu%n  
{ j'lC]}kH  
 BOOL bAdded=FALSE;  D@]/%;  
 for(int index=0;index<MAX_KEY;index++){ u('`.dwkc  
  if(hCallWnd[index]==0){ {z9z#8`C;  
   hCallWnd[index]=hWnd; o'Y/0hkh  
   HotKey[index]=cKey; Fr2F&NN`D  
   HotKeyMask[index]=cMask; $ % B  
   bAdded=TRUE; C]h_co2eI  
   KeyCount++; :lK8i{o  
   break; Mq#Hi9SKY  
  } .LbAR u  
 } 46B'Ec  
 return bAdded; Q:'r p  
} BH}M]<5  
tGSX TF}G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *_H]?&  
{ ][XCpJ)8  
 BOOL bRemoved=FALSE; 5@pLGMHT  
 for(int index=0;index<MAX_KEY;index++){ (CAkzgTfc  
  if(hCallWnd[index]==hWnd){ 6 B7 F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7I;0 %sVQ{  
    hCallWnd[index]=NULL; BA8!NR|  
    HotKey[index]=0; =F5zU5`i  
    HotKeyMask[index]=0; Tr;&bX5]H  
    bRemoved=TRUE; 7g%\+%F I  
    KeyCount--; nHU}OGzW  
    break; E!>MJlA:k6  
   } /"^XrVi-  
  } +k0UVZZX?  
 } ?30pNF|  
 return bRemoved; ,D&-.`'E  
} D z[ ,;  
Ylgr]?Db*  
void VerifyWindow() Zlygx  
{ R0G!5>1i  
 for(int i=0;i<MAX_KEY;i++){ qca=a }  
  if(hCallWnd!=NULL){ Pu'NSNT  
   if(!IsWindow(hCallWnd)){ K@{R?j/+  
    hCallWnd=NULL; xqauSW  
    HotKey=0; (UTA3Db  
    HotKeyMask=0; WmRu3O  
    KeyCount--;  @l&{ j  
   } #vAqqAS`,  
  } V?-2FK]  
 } E?VOst&  
} 5v sn'=yN  
'aS: Azb  
BOOL CHookApp::InitInstance() V >~\~H2Y  
{ Zv9%}%7p  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7ZUS  
 hins=AfxGetInstanceHandle(); ~ NO7@m uw  
 InitHotkey(); !FvL2L  
 return CWinApp::InitInstance(); G+\&8fi0  
} i?|u$[^=+  
m @)Ya*=<  
int CHookApp::ExitInstance() =GiN~$d  
{ phwBil-vUU  
 VerifyWindow(); Fc|N6I'o  
 UnInit(); #eF k  
 return CWinApp::ExitInstance(); O(:/ &`)  
} $&i8/pD  
^+kymZ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  xS="o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G'wyH[ d/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &z>iqm"Ww  
#if _MSC_VER > 1000 eQMa9_  
#pragma once nB}eJD|  
#endif // _MSC_VER > 1000 PtGFLM9R  
ke)<E98DC  
class CCaptureDlg : public CDialog ,pUB[w\  
{ N{6-a  
 // Construction Q<yvpT(  
 public: t"5ZYa  
  BOOL bTray; R?Ch8mW.!  
  BOOL bRegistered; };f^*KZ=0  
  BOOL RegisterHotkey(); Kp!A ay  
  UCHAR cKey; UlPGB2B  
  UCHAR cMask; 3PkU>+.6  
  void DeleteIcon(); 08g2? 5w"  
  void AddIcon(); >x ]{c b/m  
  UINT nCount; =%B}8$.|  
  void SaveBmp(); *o<|^,R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O>9-iqP>`d  
  // Dialog Data v9Lf|FXo&  
  //{{AFX_DATA(CCaptureDlg) 2;w> w#}>  
  enum { IDD = IDD_CAPTURE_DIALOG }; iT+t  
  CComboBox m_Key; AdzdYZiM_  
  BOOL m_bControl; /XdLdA!v  
  BOOL m_bAlt; &3itBQF  
  BOOL m_bShift; =p dLh  
  CString m_Path; 474 oVdGx  
  CString m_Number; 1k{H,p7  
  //}}AFX_DATA (@bq@0g  
  // ClassWizard generated virtual function overrides QoMa+QTuc  
  //{{AFX_VIRTUAL(CCaptureDlg) 9Fg:   
 public: .Y }k@T40a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5D mSgP:  
 protected: cs4IO O$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }|j#C[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vorb?iVf>  
  //}}AFX_VIRTUAL G)gb5VW k  
  // Implementation n>)h9q S  
 protected: v7f[$s$m  
  HICON m_hIcon; )"63g   
  // Generated message map functions V5 Gy|X  
  //{{AFX_MSG(CCaptureDlg) 8< J3Xe  
  virtual BOOL OnInitDialog(); PK&X | h  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]1I-e2Q-J  
  afx_msg void OnPaint(); (R9"0WeF  
  afx_msg HCURSOR OnQueryDragIcon(); /sqfw,h@  
  virtual void OnCancel(); f*^bV_  
  afx_msg void OnAbout(); SjcX|=S  
  afx_msg void OnBrowse(); ;R3o$ZlY  
  afx_msg void OnChange(); "kKIv|`  
 //}}AFX_MSG 4I.)>+8V  
 DECLARE_MESSAGE_MAP() \@zoM:[sN  
}; \[/}Cy  
#endif Yfy";C7X  
QHtN_Q_F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file uI3oPP> $  
#include "stdafx.h" { 3 "jn  
#include "Capture.h" i;:}{G<  
#include "CaptureDlg.h" |:`)sx3@#  
#include <windowsx.h> lGJ&\Lv:  
#pragma comment(lib,"hook.lib") v2YU2-X[  
#ifdef _DEBUG BLm}mb#/{  
#define new DEBUG_NEW 1\/~>  
#undef THIS_FILE AU;Iif6  
static char THIS_FILE[] = __FILE__; V h5\'Sn  
#endif  gA19f  
#define IDM_SHELL WM_USER+1 x$pz(Q&v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I,r0K]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]UZP dw1D  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YDgG2hT/2  
class CAboutDlg : public CDialog !HXyvyDN  
{ -1ci.4F&  
 public: IcNZUZGE  
  CAboutDlg(); _&]Gw, ~/i  
  // Dialog Data ;h#Q!M&e#  
  //{{AFX_DATA(CAboutDlg) vJ;0%;eu[!  
  enum { IDD = IDD_ABOUTBOX }; }hXmK.['  
  //}}AFX_DATA khQ fLA  
  // ClassWizard generated virtual function overrides `'pfBVBz  
  //{{AFX_VIRTUAL(CAboutDlg) eGWwPSIp  
 protected: "M,Hm!j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w!}kcn<  
  //}}AFX_VIRTUAL X& XD2o"rt  
  // Implementation 59V8cO+qH  
 protected: U?EXPi61Z  
  //{{AFX_MSG(CAboutDlg) Bo0T}P~  
  //}}AFX_MSG V]Uc@7S/  
  DECLARE_MESSAGE_MAP() 9rM#w"E?<  
}; _# &_`bZH  
_OK!/T*FBt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m5W':vM  
{ %B\VY+  
 //{{AFX_DATA_INIT(CAboutDlg) W>[TFdH?  
 //}}AFX_DATA_INIT s2#}@b6'.  
} <co:z<^lqu  
+}BKDEb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) C *7x7|z  
{ 9q2x}  
 CDialog::DoDataExchange(pDX); Seq ^o=  
 //{{AFX_DATA_MAP(CAboutDlg) ]DZ~"+LaG  
 //}}AFX_DATA_MAP `*B6T7p1  
} ^Jc|d,u;s  
OSwum!hzN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M0]J `fL@  
 //{{AFX_MSG_MAP(CAboutDlg) XFi9qL^  
 // No message handlers 2l~qzT-  
 //}}AFX_MSG_MAP pQ8f$I#v  
END_MESSAGE_MAP() r\q|DZ7  
i1Y<[s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  o%$R`;  
: CDialog(CCaptureDlg::IDD, pParent) p`'3Il3  
{ )0=H)k0  
 //{{AFX_DATA_INIT(CCaptureDlg) ]zI*}(adu  
  m_bControl = FALSE; ;NGSJfn  
  m_bAlt = FALSE; 66po SZR@  
  m_bShift = FALSE; k?_uv  
  m_Path = _T("c:\\"); k:&B b"  
  m_Number = _T("0 picture captured."); ]'z 5%'  
  nCount=0; `a@YbuLd  
  bRegistered=FALSE; ];QX&";Z  
  bTray=FALSE; +t(Gt0+  
 //}}AFX_DATA_INIT !{A#\~,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 EEHTlqvR  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $;)A:*e  
} rt\.|Hr4s  
+0:]KG!Zs.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c >xHaA:V  
{ x. /WP~I  
 CDialog::DoDataExchange(pDX); {=+'3p  
 //{{AFX_DATA_MAP(CCaptureDlg) BD M"";u  
  DDX_Control(pDX, IDC_KEY, m_Key); F*y7 4j,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); I0_>ryA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =ibKdPtTh^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L; <Pod  
  DDX_Text(pDX, IDC_PATH, m_Path); IkQ,#Bsb[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); bFJ>+ {#  
 //}}AFX_DATA_MAP 9Wdx"g52_D  
} r$,Xv+}  
zOis}$GR  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Z jXn,W]~  
//{{AFX_MSG_MAP(CCaptureDlg) 35fj-J$8  
 ON_WM_SYSCOMMAND() 2>xEE  
 ON_WM_PAINT() H$6;{IUz~  
 ON_WM_QUERYDRAGICON() M4t:)!dji?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ZD4:'m`T/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sTxbh2  
 ON_BN_CLICKED(ID_CHANGE, OnChange) mwF{z.t"  
//}}AFX_MSG_MAP !" @<!  
END_MESSAGE_MAP() S]gV!Q4%  
]'0}fuV  
BOOL CCaptureDlg::OnInitDialog() <Q_E3lQy/  
{ 48.4GwL7  
 CDialog::OnInitDialog(); 1CS\1[E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); i8=+ <d  
 ASSERT(IDM_ABOUTBOX < 0xF000); *^ua2s.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2 yRUw  
 if (pSysMenu != NULL) ixB"6O  
 { 'lOpoWDL  
  CString strAboutMenu; c']m5q39'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :{ai w?1  
  if (!strAboutMenu.IsEmpty()) +O7GgySx  
  { HzAw rC  
   pSysMenu->AppendMenu(MF_SEPARATOR); _DYe<f.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Pt/F$A{Cj  
  } b\UE+\a&  
 } )vGxF}I3  
 SetIcon(m_hIcon, TRUE); // Set big icon O*>`md?MH  
 SetIcon(m_hIcon, FALSE); // Set small icon ~8)l/I=`);  
 m_Key.SetCurSel(0); I-W ,C &J>  
 RegisterHotkey(); D*g K,`  
 CMenu* pMenu=GetSystemMenu(FALSE); w$jSlgUHy)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :bq UA(k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HHT8_c'CC#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,9$|"e&  
 return TRUE; // return TRUE unless you set the focus to a control ?',GRaD  
} !fJy7Y  
, Q)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GGsAisF"N  
{ MKX58y{+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  4Gj  
 { Fh}GJE   
  CAboutDlg dlgAbout; !_-Uwg  
  dlgAbout.DoModal();  H@sM$8  
 } #`%V/#YK  
 else JHJ]BMm  
 { 3.h0  
  CDialog::OnSysCommand(nID, lParam); m~gcc  
 } X#ud_+6x  
} B_"PFWwg  
|J~A )Bw?  
void CCaptureDlg::OnPaint() +)_#j/  
{ _lfS"ae  
 if (IsIconic()) lr)9U 7  
 { cvjZ$Fcc%(  
  CPaintDC dc(this); // device context for painting .qCI!%fg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8`Tj*7Y=  
  // Center icon in client rectangle ksyQ_4^SO  
  int cxIcon = GetSystemMetrics(SM_CXICON); pV$A?b"?*  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7s 0pH+  
  CRect rect; )g ?'Nz  
  GetClientRect(&rect); ?v&2^d4C*F  
  int x = (rect.Width() - cxIcon + 1) / 2; -gv[u,R  
  int y = (rect.Height() - cyIcon + 1) / 2; %Lp#2?*  
  // Draw the icon PVrNS7 Rk/  
  dc.DrawIcon(x, y, m_hIcon); q,=YKw)*  
 } /mK]O7O7  
 else A $l  
 { }&^1")2t  
  CDialog::OnPaint(); pbG v\S F  
 } tQ)l4Y 8  
} >KJE *X@s  
A" IaFXB  
HCURSOR CCaptureDlg::OnQueryDragIcon() 27Vx<W  
{ CW,|l0i  
 return (HCURSOR) m_hIcon; e_3B\59k  
} "j=E8Dd}  
pJ/{X=y  
void CCaptureDlg::OnCancel() .G>~xm0  
{ t6~~s iQI'  
 if(bTray) b\H,+|i K  
  DeleteIcon(); xo{z4W  
  CDialog::OnCancel(); +; =XiB5R  
} nE4rB\  
}'h\;8y  
void CCaptureDlg::OnAbout() d,o|>e$  
{ Us3zvpy)o  
 CAboutDlg dlg; 3w+ +F@(  
 dlg.DoModal(); YOtzj a]~  
} :e\M~n+y  
9!6u Yf+  
void CCaptureDlg::OnBrowse() |wuN`;gc"  
{ CH$* =3M  
 CString str; 0bjZwC4J  
 BROWSEINFO bi; v 1 f^gde  
 char name[MAX_PATH]; b 2~5LZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <@;bxSUx  
 bi.hwndOwner=GetSafeHwnd(); _$KkSMA~_  
 bi.pszDisplayName=name; ;.7]zn.X]2  
 bi.lpszTitle="Select folder"; DO~~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @Suww@<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); kWgrsN+Z  
 if(idl==NULL) aUKa+"`S  
  return; F/"lJ/I  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2]H?q!l!O  
 str.ReleaseBuffer(); Xet} J@C  
 m_Path=str; T^Hq 5Oy  
 if(str.GetAt(str.GetLength()-1)!='\\') ?]>;Wr  
  m_Path+="\\"; R_#k^P^  
 UpdateData(FALSE); ,n$HTWa@0  
} 9<5ii  
h#u k-7  
void CCaptureDlg::SaveBmp() Cm-dos  
{ h2 >a_0"  
 CDC dc; MF +F8h>/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); x/%/MFK)>8  
 CBitmap bm; _;:B@Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^vTp.7o~5  
 int Height=GetSystemMetrics(SM_CYSCREEN); .xtam 8@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4!Lj\.!$  
 CDC tdc; * K0aR!  
 tdc.CreateCompatibleDC(&dc); 2 y& k  
 CBitmap*pOld=tdc.SelectObject(&bm); f5'vjWJ30  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :*J!  
 tdc.SelectObject(pOld); +<WNAmh   
 BITMAP btm; Z;6?,5OSc  
 bm.GetBitmap(&btm); `(~oZbErM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8>DX :`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x'V:qv*O  
 BITMAPINFOHEADER bih; y>ePCDR3  
 bih.biBitCount=btm.bmBitsPixel; .<6'*X R  
 bih.biClrImportant=0; K pmq C$  
 bih.biClrUsed=0; >eX9dA3X  
 bih.biCompression=0; cY.5z:7u~v  
 bih.biHeight=btm.bmHeight; 3GXmyo:o$  
 bih.biPlanes=1; aF.fd2k  
 bih.biSize=sizeof(BITMAPINFOHEADER); I%CrsEo  
 bih.biSizeImage=size; (1%A@ 4  
 bih.biWidth=btm.bmWidth; H~W=#Cx  
 bih.biXPelsPerMeter=0; GsIqUM#R  
 bih.biYPelsPerMeter=0; JY$;m3h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yRt7&,}zL  
 static int filecount=0; MkM`)g 5  
 CString name; #X0Y8:vj  
 name.Format("pict%04d.bmp",filecount++); 5zH_yZ@+  
 name=m_Path+name; 3/8<dc  
 BITMAPFILEHEADER bfh; Y5<W"[B!  
 bfh.bfReserved1=bfh.bfReserved2=0; :%IB34e  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^-(DokdBn  
 bfh.bfSize=54+size; 8#RL2)7Uy`  
 bfh.bfOffBits=54;  x(A6RRh  
 CFile bf; {Bb:\N8X  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2FEi-m}  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); w+hpi5OH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [f=Y*=u9,  
  bf.WriteHuge(lpData,size); 1/c+ug!y  
  bf.Close(); % ejq|i7  
  nCount++; BxesoB  
 } <6C:\{eo  
 GlobalFreePtr(lpData); )%HIC@MM6  
 if(nCount==1) RT[ E$H  
  m_Number.Format("%d picture captured.",nCount); E*QLw* H  
 else o>HGfr,N  
  m_Number.Format("%d pictures captured.",nCount); 0Q[;{}W}  
  UpdateData(FALSE); }`]Et99Q5  
} lDZ~  
l _zTpyOZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Cw~fP[5XMF  
{ t_\&LMD  
 if(pMsg -> message == WM_KEYDOWN) 5e&;f  
 { %.;;itB  
  if(pMsg -> wParam == VK_ESCAPE) ^t,haO4  
   return TRUE; V2$M`|E  
  if(pMsg -> wParam == VK_RETURN) '|G8yojz  
   return TRUE; [x -<O:r=P  
 } {N@Pk[!  
 return CDialog::PreTranslateMessage(pMsg); _U Y5  
} cuL/y$+EY  
u"DE?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CM)V^k*  
{ <>V~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ka$lNL3<j  
  SaveBmp(); s $ ?;C  
  return FALSE; [ZS.6{vr  
} x::d}PP7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )QI#szv6  
 CMenu pop; 7nZ3u _~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Nwk^r75lq  
 CMenu*pMenu=pop.GetSubMenu(0); \Npvm49  
 pMenu->SetDefaultItem(ID_EXITICON); ow#8oUf=  
 CPoint pt; ]N:Wt2  
 GetCursorPos(&pt); 0+AMN-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); N\Ab0mDOV.  
 if(id==ID_EXITICON) z</^qy  
  DeleteIcon(); 0R}hAK+| 4  
 else if(id==ID_EXIT) FhQb9\g  
  OnCancel(); ul!q)cPb{  
 return FALSE; X#o;`QM  
} _.SpU`>/f  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [<nd+3E  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )-25?B  
 AddIcon(); )*aAkM  
 return res; Bq tN=  
} p:3w8#)MZ  
wcGv#J],  
void CCaptureDlg::AddIcon() n/YnISt  
{ ulfs Z:  
 NOTIFYICONDATA data; lLI%J>b@  
 data.cbSize=sizeof(NOTIFYICONDATA); 6sT( t8[  
 CString tip; Y[W] YPs  
 tip.LoadString(IDS_ICONTIP); JX`>N(K4\  
 data.hIcon=GetIcon(0); BJ{?S{"6%G  
 data.hWnd=GetSafeHwnd(); oslj<  
 strcpy(data.szTip,tip); QRwOv  
 data.uCallbackMessage=IDM_SHELL; im F,8'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UI*&@!%bzp  
 data.uID=98; {a(<E8-^  
 Shell_NotifyIcon(NIM_ADD,&data); bb$1zSA  
 ShowWindow(SW_HIDE); E CPSE {  
 bTray=TRUE; ,Qj\_vr@  
} 8#HQ05q>  
0f9U:)1z  
void CCaptureDlg::DeleteIcon() x!u6LDq0  
{ e1hf{:&/G@  
 NOTIFYICONDATA data; ,Bj]j -\Y  
 data.cbSize=sizeof(NOTIFYICONDATA); vgi`.hk  
 data.hWnd=GetSafeHwnd(); ,_K:DSiB  
 data.uID=98; Uh'W d_?  
 Shell_NotifyIcon(NIM_DELETE,&data); >2NsBS(  
 ShowWindow(SW_SHOW); YB(8 T"  
 SetForegroundWindow(); k7M{+X6[  
 ShowWindow(SW_SHOWNORMAL); 7**zO3 H  
 bTray=FALSE; ::@JL  
} J!}R>mR  
m<!CF3g  
void CCaptureDlg::OnChange() #hXuGBZEI  
{ !04 ^E  
 RegisterHotkey(); }&%&0$%  
} |*L/ m0'L  
845\u&  
BOOL CCaptureDlg::RegisterHotkey() (@S 9>z4s  
{ &uI33=   
 UpdateData(); ER:K^ Za  
 UCHAR mask=0; (U:6vk3Q  
 UCHAR key=0; >E WK cocM  
 if(m_bControl) 3M>y.MS  
  mask|=4; milQxSpj  
 if(m_bAlt) |C>\k u*  
  mask|=2; -o57"r^x  
 if(m_bShift) 1U ='"  
  mask|=1; ~eUv.I/  
  key=Key_Table[m_Key.GetCurSel()]; oUB9)C~  
 if(bRegistered){ A@reIt  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?28)l 4 Ml  
  bRegistered=FALSE; {_ZbPPh;M"  
 } nFwdW@E9  
 cMask=mask; =.,XJIw&  
 cKey=key; :)Da^V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Me^L%%: @  
 return bRegistered; =q[ynZ8O\w  
} 1"T&B0G3l  
E cd~H+  
  四、小结 rK4 pYo  
?S.LGc  
  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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