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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: n@  lf+  
  SYd4 3P A  
  一、实现方法 ^.)oQo SE  
rpH ,c[D  
  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: lYldq)qB{  
Q.X)QCp#r  
#pragma data_seg("shareddata") ;"46H'>!  
HHOOK hHook =NULL; //钩子句柄 {Qbg'|HO=l  
UINT nHookCount =0; //挂接的程序数目 >Lj0B%^EvM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &7_xr.c7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 -J*BY2LU3f  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vFm8T58 7  
static int KeyCount =0; a(RTb<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^k6 A,Ak  
#pragma data_seg() =REMSe j  
ci*rem  
  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。 {7swE(N  
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  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: hB/4.K]8  
8AL`<8$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR vOIK6-   
cKey,UCHAR cMask) &iR3]FNI  
{ UW%zR5q  
 BOOL bAdded=FALSE; EQ< qN<uW  
 for(int index=0;index<MAX_KEY;index++){ r ,I';vm<`  
  if(hCallWnd[index]==0){ ;PM(q<@\  
   hCallWnd[index]=hWnd; DmzK* O{  
   HotKey[index]=cKey; 'w//d $+G_  
   HotKeyMask[index]=cMask; S&(MR%".  
   bAdded=TRUE; *} @Y"y  
   KeyCount++; UF37|+"E  
   break; [ye!3h&]  
  } [0vgA#6I  
 } A#NJ8_  
 return bAdded; i/UDda"E  
} VPOzt7:  
//删除热键 aia`mO]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (j<FS>##  
{ 0F48T<i  
 BOOL bRemoved=FALSE; 5PF?Eq   
 for(int index=0;index<MAX_KEY;index++){ mQL8ec_c  
  if(hCallWnd[index]==hWnd){  vVvx g0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %vF,wQC  
    hCallWnd[index]=NULL; \vg(@)$q   
    HotKey[index]=0; Oly"ll*K  
    HotKeyMask[index]=0; |!t &ZpdD  
    bRemoved=TRUE; FR*CiaD1  
    KeyCount--; zEM  c)  
    break; <O<Kf:i&c1  
   } M~/Pk7CC  
  } {*yFTP"93  
 } JRgrg &#  
 return bRemoved; FZFYwU\~.L  
} 3{:AG,G  
/H (55^EMZ  
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  DLL中的钩子函数如下: ,5*Z<[*  
?Z^?A^; }$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "FD`1  
{ @n|Mr/PAj  
 BOOL bProcessed=FALSE; hw 5NHZ I'  
 if(HC_ACTION==nCode) 5S9i>B  
 { jm ORKX+)  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !l6Ez_'  
   switch(wParam) '@0Z#A  
   {  8_W=)w6  
    case VK_MENU: SAVA6 64  
     MaskBits&=~ALTBIT; !l(D0 C  
     break; 6y+_x'  
    case VK_CONTROL: NZb}n`:  
     MaskBits&=~CTRLBIT; #zf,%IYF  
     break; r5,V-5b  
    case VK_SHIFT: u+7S/9q8  
     MaskBits&=~SHIFTBIT; QjlQsN!  
     break; vZiuElxKi  
    default: //judge the key and send message n 9>**&5L  
     break; AAXlBY6Y-  
   } wo+ b":  
   for(int index=0;index<MAX_KEY;index++){ 8@ZZ[9kt  
    if(hCallWnd[index]==NULL) gf ?_tB0C  
     continue; !qu/m B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) { 1eW*9  
    { P @Jo[J<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); RW`j^q,c3  
     bProcessed=TRUE; 6!Q,X Hs  
    } y9Q #%a8V  
   } h/oC9?v  
  } <*Gd0 v%  
  else if((lParam&0xc000ffff)==1){ //有键按下 Cut7  
   switch(wParam) O#@G .~n?  
   { diWi0@  
    case VK_MENU: -Hh.8(!XoO  
     MaskBits|=ALTBIT; $L4h'(s  
     break; |}o6N5)  
    case VK_CONTROL: ^~1Z"kAnT  
     MaskBits|=CTRLBIT; J#DN2y <  
     break; zCdcwTe  
    case VK_SHIFT: hHk9O?  
     MaskBits|=SHIFTBIT; *e25!#o1  
     break; RsW4 '5  
    default: //judge the key and send message |{ @BH  
     break; P,rD{ 0~  
   } 5m yQBKE  
   for(int index=0;index<MAX_KEY;index++){ /,,IM/(6^  
    if(hCallWnd[index]==NULL) D JZ$M  
     continue; !%'"l{R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z5J$".O`  
    { ?J@P0(M#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $x*(D|\'<  
     bProcessed=TRUE; W6s-epsRmT  
    } 74=zLDDS  
   } Mi} .  
  } /5Sd?pW;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \<HY'[gr  
   for(int index=0;index<MAX_KEY;index++){ %i.Prckrb  
    if(hCallWnd[index]==NULL) sDB,+1"Y$  
     continue; z22:O"UHa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u}.mJDL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f@ILC=c<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 FeNNzV=  
   } A">R-1R  
  } @1A.$:  
 } P  Ij  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z7NR%u_|[  
} Q*hXFayx  
eQwvp`@"  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Jflm-Hhsf  
J$U_/b.mk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g2?yT ?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p<<dj%  
V`8\)FFG  
  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: ME66BWg{  
CQPq5/@Y4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) * ,zrg%8  
{ \mL]xE-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #-o 'g!  
 { qLPuKIF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yJ="dEn>i"  
  SaveBmp(); {:|b,ep T  
  return FALSE; {.?pl]Zl6  
 } D"2bgw  
 …… //其它处理及默认处理 k?rJGc G  
} EywBT  
.K]Uk/W  
3~{0X-  
  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。 qi ">AQpp  
eL<jA9cJ9  
  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。 gZiwXb  
U~d%5?q  
  二、编程步骤 5,4m_fBoW  
sm;kg=  
  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"; |+KwyHE`9  
F+ 7*SImv6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "%b Gw v  
DN iH" 0%  
  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; %P{3c~?DH  
*<[zG7+&[  
  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; &E1m{gB(  
Yep~C %/}  
  5、 添加代码,编译运行程序。 "LSzF_mK  
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三、程序代码 8.>himL  
CB X}_]9X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,p#r; O<O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) oh@Ha?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `/?'^A%Ik  
#if _MSC_VER > 1000 "$aoIXv  
#pragma once L^zh|MEyzk  
#endif // _MSC_VER > 1000 tj*/%G{Y  
#ifndef __AFXWIN_H__ $7ix(WL<%  
#error include 'stdafx.h' before including this file for PCH 8O$ LY\G  
#endif c&x1aF "B  
#include "resource.h" // main symbols }-J0cV  
class CHookApp : public CWinApp 2Y<]X7Ch:  
{ $PI9vyS  
 public: ,QpFVlPU  
  CHookApp(); #0hqfs  
  // Overrides (Q @'fb9z  
  // ClassWizard generated virtual function overrides RKE"}|i +S  
  //{{AFX_VIRTUAL(CHookApp) 0:>hK\F#  
 public: @g4o8nH}  
  virtual BOOL InitInstance(); 5&h">_j  
  virtual int ExitInstance(); ~%C F3?e6  
  //}}AFX_VIRTUAL Wy*+8~@A  
  //{{AFX_MSG(CHookApp) n>R(e>  
  // NOTE - the ClassWizard will add and remove member functions here. HsUh5;  
  // DO NOT EDIT what you see in these blocks of generated code ! E1tCY.N{  
  //}}AFX_MSG IM7<z,*oF  
  DECLARE_MESSAGE_MAP() aidQ,(PDj  
}; -B9e&J {K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); beC%Tnb7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SOOJqC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1YJ?Y  
BOOL InitHotkey(); * Ogf6  
BOOL UnInit(); g2m* Q%  
#endif > *VvV/UU  
xO Aq!,|V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '?mF,C o{  
#include "stdafx.h" M?UUT8,  
#include "hook.h" jx}'M$TA  
#include <windowsx.h> N0-J=2  
#ifdef _DEBUG lZ.lf.{F  
#define new DEBUG_NEW kY'Wf`y(  
#undef THIS_FILE VOZxLyj^9  
static char THIS_FILE[] = __FILE__; op5 `#{  
#endif !C05;x8{  
#define MAX_KEY 100 9\<q =p~  
#define CTRLBIT 0x04 o2U5irU  
#define ALTBIT 0x02 }`Ya;  
#define SHIFTBIT 0x01 )J> dGIb  
#pragma data_seg("shareddata") iiMS3ueF  
HHOOK hHook =NULL; =g! Pw]  
UINT nHookCount =0; ;'8Wl  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k]5tU\;Yw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT qar{*>LCG  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3CjixXaA$  
static int KeyCount =0; D@gC(&U/6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +cqUp6x.  
#pragma data_seg() JJ ?'<)EF  
HINSTANCE hins; 1xd6p  
void VerifyWindow(); 6>rz=yAM_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ca5#'3Eh  
//{{AFX_MSG_MAP(CHookApp) 8|=C/k  
// NOTE - the ClassWizard will add and remove mapping macros here. GI/NouaNfm  
// DO NOT EDIT what you see in these blocks of generated code! h7q{i|5  
//}}AFX_MSG_MAP 8I RKCuV  
END_MESSAGE_MAP() T?m@`"L,  
bUm%#a  
CHookApp::CHookApp() {+hABusq  
{ 8`urkEI^r  
 // TODO: add construction code here, W j^@Zq#  
 // Place all significant initialization in InitInstance BLt58LYGX  
} sV,Yz3E<u$  
# euG$(  
CHookApp theApp; M.t,o\xl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $M,<=.oT  
{ c,.@Cc2  
 BOOL bProcessed=FALSE; qS @3:R  
 if(HC_ACTION==nCode) !>> A@3  
 { 9 ;p5z[jI  
  if((lParam&0xc0000000)==0xc0000000){// Key up n4S`k%CI  
   switch(wParam) TG$ #aX\'  
   { AZc= Bbh  
    case VK_MENU: GkI'.  
     MaskBits&=~ALTBIT; ~nU9j"$  
     break; G`O*AQ}[  
    case VK_CONTROL: ,4t6Cq!  
     MaskBits&=~CTRLBIT; r/'!#7dLG-  
     break; {:!>Y1w>  
    case VK_SHIFT: hQ<7k'V  
     MaskBits&=~SHIFTBIT; xH:L6K/c  
     break; FqA4 O U  
    default: //judge the key and send message R)JH D7 1  
     break; %6uZb sa  
   } IxCesh  
   for(int index=0;index<MAX_KEY;index++){ s2SV   
    if(hCallWnd[index]==NULL) &Jj|+P-lY  
     continue; :Q("  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F ><_gIT  
    { 1k4\zVgi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i,<'AL )  
     bProcessed=TRUE; Rk g8  
    } J^jd@E  
   } $3 -QM  
  } KF+r25uy[+  
  else if((lParam&0xc000ffff)==1){ //Key down EQ~<NzRp=  
   switch(wParam) <DR|r  
   { |8CxMs  
    case VK_MENU: g&y (-  
     MaskBits|=ALTBIT; o{#aF=`{  
     break; 46D`h!7L  
    case VK_CONTROL: !38KHq^|&  
     MaskBits|=CTRLBIT; v%cCJ SO#  
     break; lM4Z7mT /  
    case VK_SHIFT: >eG<N@13p  
     MaskBits|=SHIFTBIT; b-VtQ%Q  
     break; ugTsI~aE  
    default: //judge the key and send message C\5G43`  
     break; hQj@D\}  
   } <">epbV6  
   for(int index=0;index<MAX_KEY;index++) &^#iS<s1  
   { * rlV E  
    if(hCallWnd[index]==NULL) Up?RN%gq  
     continue; $?W2'Xm!V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [nig^8  
    { \O "`o4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  ]Pe>T&  
     bProcessed=TRUE; o 7kg.w|  
    } j8Z;}Ps  
   } gQ0,KYmI3_  
  } [A =0fg5  
  if(!bProcessed){ I?g}q,!]  
   for(int index=0;index<MAX_KEY;index++){ HBe*wkPd  
    if(hCallWnd[index]==NULL) d]s^?=gM  
     continue; g=nb-A{#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Hh;lT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _-({MX[3k<  
   } B;N<{Gb  
  } ZAfuW^r  
 } *KDTBd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #<[&Lw  
} 1Z c=QJw@  
kE<CuO  
BOOL InitHotkey() %r1#G.2YW  
{ W !j-/ql  
 if(hHook!=NULL){ QG?!XWz  
  nHookCount++; &Iy5@8  
  return TRUE; +7w5m  
 } 5n2!Y\  
 else ?SgFD4<~P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); mM&P&mz/D  
  if(hHook!=NULL) xP'0a  
   nHookCount++; nm#23@uZ4K  
  return (hHook!=NULL); X <8|uP4  
} btEyvqs~X  
BOOL UnInit() c6vJ;iz  
{ h#4n  
 if(nHookCount>1){  Rw0|q  
  nHookCount--; ~*1>)P8]#  
  return TRUE; -&7? !<f  
 } %OgK{h  
 BOOL unhooked = UnhookWindowsHookEx(hHook); UZs '[pm)  
 if(unhooked==TRUE){ -y!Dg6 A  
  nHookCount=0; =nCA=-Jv  
  hHook=NULL; QxW+|Gt._  
 } GYQ:G=  
 return unhooked; K!CVS7  
} H6`k%O*  
5PeYQ-B|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3LfF{ED@  
{ Vc9Bg2f5  
 BOOL bAdded=FALSE; X8Z) W?vu  
 for(int index=0;index<MAX_KEY;index++){ :a)RMp+^0  
  if(hCallWnd[index]==0){ ^V;r  
   hCallWnd[index]=hWnd; :MF`q.:X  
   HotKey[index]=cKey; IQ\!wWKmY  
   HotKeyMask[index]=cMask; kIS )*_  
   bAdded=TRUE; 9J7yR}2-F  
   KeyCount++; >mA]2gV<a  
   break; yWRIh*>nE  
  } Jm CHwyUK?  
 } `?=3[  
 return bAdded; mr}o0@5av  
} 2i6=g<   
b&`~%f-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `TO Xkt j  
{ cu}(\a  
 BOOL bRemoved=FALSE; 5: gpynE|  
 for(int index=0;index<MAX_KEY;index++){ moFrNcso  
  if(hCallWnd[index]==hWnd){ ;C*2Djb*n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^n~Kr1}nj  
    hCallWnd[index]=NULL; BDfMFH[1  
    HotKey[index]=0; Y~*p27@fR  
    HotKeyMask[index]=0; Nk -xnTZ"  
    bRemoved=TRUE;  =AaF$R  
    KeyCount--; z@IG"D  
    break; n5 ~Dxk  
   } _`=qc/-0  
  } t9<BQg  
 } bl!pKOY  
 return bRemoved; gLt6u|0q  
} V$DB4YM1k  
7n .A QII  
void VerifyWindow() uHquJQ4  
{ <k1muSe  
 for(int i=0;i<MAX_KEY;i++){ .sit5BX  
  if(hCallWnd!=NULL){ !2AD/dtt   
   if(!IsWindow(hCallWnd)){ OF1^_s;  
    hCallWnd=NULL; [YlRz  
    HotKey=0; >Q=e9L=  
    HotKeyMask=0; .&]3wB~  
    KeyCount--; >N! Xey  
   } B7C<;`5TiD  
  } =4x6v<  
 } _0naqa!JyH  
} ]Y$Wv9 S6  
fMf;  
BOOL CHookApp::InitInstance() k:/Z6TLk3  
{ |;V-;e*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BuM #&]s  
 hins=AfxGetInstanceHandle(); ]Y?ZUSCJ  
 InitHotkey(); 5R.jhYAj  
 return CWinApp::InitInstance(); pT+OPOSR  
} ZiKO|U@/  
=?Co<972Z  
int CHookApp::ExitInstance() hb1h .F  
{ Qj /H$  
 VerifyWindow(); 8M3DG=D  
 UnInit(); K7x;/O  
 return CWinApp::ExitInstance(); :L:] 3L  
} ?gU - a  
@ajdO/?(Y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file WM$Z?CN%KB  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]EN&EA"<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ CO ZfR~}  
#if _MSC_VER > 1000 hms Aim9i  
#pragma once ~PpU'[  
#endif // _MSC_VER > 1000 hn6'$P  
*mn9CVZ(}M  
class CCaptureDlg : public CDialog Kzt:rhiB  
{ "j&p3  
 // Construction o2YHT \P n  
 public: D][I#v h  
  BOOL bTray; 6>)KiigZ\  
  BOOL bRegistered; lzFg(Ds!f  
  BOOL RegisterHotkey(); uRuu!{$  
  UCHAR cKey; 2l+'p[b0>  
  UCHAR cMask; h52+f  
  void DeleteIcon(); 7 oYD;li$k  
  void AddIcon(); Uq%|v  
  UINT nCount; sSiZG  
  void SaveBmp(); 2gvS`+<TP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor I2z7}*<u  
  // Dialog Data |~Awm"  
  //{{AFX_DATA(CCaptureDlg) 0icB2Jm:D}  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z +<Y.*6  
  CComboBox m_Key; >NpW$P{'  
  BOOL m_bControl; >X>]QMfh  
  BOOL m_bAlt; k]TJL9Q  
  BOOL m_bShift; eEmLl(Lb  
  CString m_Path; A}"uEk(R  
  CString m_Number; zcEpywNP  
  //}}AFX_DATA <(qdxdUp  
  // ClassWizard generated virtual function overrides ,=%c e  
  //{{AFX_VIRTUAL(CCaptureDlg) ws]d,]  
 public: !<-+}X+o8$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~3Z(0 gujD  
 protected: V/"41  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LR17ilaa'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &)~LGWBdC  
  //}}AFX_VIRTUAL P_@ty~u  
  // Implementation NXE1v~9V  
 protected: 8wS9%+  
  HICON m_hIcon; t6+>Zr  
  // Generated message map functions C|ou7g4'p  
  //{{AFX_MSG(CCaptureDlg) 6z67%U*8r  
  virtual BOOL OnInitDialog(); RQn3y-N]  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MD+ eLA7  
  afx_msg void OnPaint(); g{7?#.7  
  afx_msg HCURSOR OnQueryDragIcon(); C4C!-12  
  virtual void OnCancel(); l?beqw:  
  afx_msg void OnAbout(); l)0yv2[h  
  afx_msg void OnBrowse(); z<<aT  
  afx_msg void OnChange(); D <Fl7QAb  
 //}}AFX_MSG IG@@CH  
 DECLARE_MESSAGE_MAP() 4_Rv}Y d  
}; j)O8&[y=  
#endif yj`xOncE}  
OoAZ t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (WS<6j[q  
#include "stdafx.h" n<sA?T  
#include "Capture.h" <=~'Pd-f(  
#include "CaptureDlg.h" TGPHjSZ1  
#include <windowsx.h> 7m 9T'  
#pragma comment(lib,"hook.lib") ]GHx<5Q:\  
#ifdef _DEBUG }pPt- k  
#define new DEBUG_NEW O/4)aW3B  
#undef THIS_FILE 4> [tjz.?k  
static char THIS_FILE[] = __FILE__; ^TY8,qDA  
#endif P~*v}A  
#define IDM_SHELL WM_USER+1 TsZX'Yn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N_8L8ds5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]G2%VKkr  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; cE]#23  
class CAboutDlg : public CDialog $L$GI~w/  
{ 8 K>Ejr  
 public: 7llEB*dSA  
  CAboutDlg(); k+&1?]   
  // Dialog Data S{ !m})1?  
  //{{AFX_DATA(CAboutDlg)  SjO Iln  
  enum { IDD = IDD_ABOUTBOX }; 'r?OzFtxh  
  //}}AFX_DATA su]ywVoRT  
  // ClassWizard generated virtual function overrides h!>NS ?X7  
  //{{AFX_VIRTUAL(CAboutDlg) z'}?mE3i  
 protected: A&fh0E (t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V.274e  
  //}}AFX_VIRTUAL 1&}^{ Ys  
  // Implementation ed)!Snz   
 protected: 0=J69Yd  
  //{{AFX_MSG(CAboutDlg) /waZ9  
  //}}AFX_MSG Y:="vWWG  
  DECLARE_MESSAGE_MAP() 9Fh(tzz  
}; ;42D+q=s  
8m"5J-uIi  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xR;-qSl7Ms  
{ :O}<Q  
 //{{AFX_DATA_INIT(CAboutDlg) aw:0R=S,>  
 //}}AFX_DATA_INIT #8d$%F))  
} NeyGIEP  
MXhRnVz"W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S.OGLLprp  
{ \ o&i63u  
 CDialog::DoDataExchange(pDX); 8Lpy`He  
 //{{AFX_DATA_MAP(CAboutDlg) h@D4~(r  
 //}}AFX_DATA_MAP ] H[FZY  
} br'/>Un"  
<cz~q=%v2&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v+=_  
 //{{AFX_MSG_MAP(CAboutDlg) P5P<-T{-c  
 // No message handlers [ @/[#p  
 //}}AFX_MSG_MAP KXFa<^\o  
END_MESSAGE_MAP() 0\U28zbMJw  
|E]YP~h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <`9:hPp0  
: CDialog(CCaptureDlg::IDD, pParent) |T"{q  
{ m%E7V{t  
 //{{AFX_DATA_INIT(CCaptureDlg) E|Grk  
  m_bControl = FALSE; y K&)H+v  
  m_bAlt = FALSE; j{P,(-  
  m_bShift = FALSE; rd 1&?X  
  m_Path = _T("c:\\"); s}9aZ  
  m_Number = _T("0 picture captured."); aTs_5q  
  nCount=0; TCF[i E{  
  bRegistered=FALSE; m x,X!}  
  bTray=FALSE; knBT(x'+  
 //}}AFX_DATA_INIT n5]<|>U vx  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >8tE`2[i*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R4JO)<'K&  
} `u-VGd\  
,?#-1uIGL>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c/2OR#$t  
{ @3S2Xb{ra1  
 CDialog::DoDataExchange(pDX); p-; ]O~^  
 //{{AFX_DATA_MAP(CCaptureDlg) Hab9~v ]  
  DDX_Control(pDX, IDC_KEY, m_Key); sq)Nn&5A  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?I/,r2ODLh  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^LC5orO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U0N[~yW(t1  
  DDX_Text(pDX, IDC_PATH, m_Path);  BW\R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); IW BVfN->}  
 //}}AFX_DATA_MAP j^!J: Bj  
} 4 |5ekwk  
w pCS]2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0`ib_&yI  
//{{AFX_MSG_MAP(CCaptureDlg) 3P\I;xM  
 ON_WM_SYSCOMMAND() MA-$aN_(  
 ON_WM_PAINT() @i)tQd!s  
 ON_WM_QUERYDRAGICON() t=e0z^2i+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D@JHi'F  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [X~X?By>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q3P3euK3  
//}}AFX_MSG_MAP yauP j&^R  
END_MESSAGE_MAP() O@=mN*<gg0  
"4?hK  
BOOL CCaptureDlg::OnInitDialog() .$OInh  
{ .N+xpxdG,  
 CDialog::OnInitDialog(); PvB?57wkF  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mpF_+Mn  
 ASSERT(IDM_ABOUTBOX < 0xF000); X%F9.<4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /1>  
 if (pSysMenu != NULL) jN<]yhqf  
 { Em]T.'y  
  CString strAboutMenu; 8|tm`r`*Az  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `k\1vum  
  if (!strAboutMenu.IsEmpty()) N^ET qg  
  { Z{CL!  
   pSysMenu->AppendMenu(MF_SEPARATOR); `x#~ -  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z$V8<&q  
  }  !fV6KkV  
 } }n 7e_qy4  
 SetIcon(m_hIcon, TRUE); // Set big icon RQ'c~D)X  
 SetIcon(m_hIcon, FALSE); // Set small icon 7w$R-Y/E  
 m_Key.SetCurSel(0); 4>Y\2O?**  
 RegisterHotkey(); [ O)Zof  
 CMenu* pMenu=GetSystemMenu(FALSE); $^XPk#$m  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &e)p6Egl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); U`Ag|R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :y %~9=  
 return TRUE; // return TRUE unless you set the focus to a control WuQYEbap  
} R _Y&Y-  
Tz-cN  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k$ M4NF~$  
{ M0e|G.S&_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T> 'Vaxo  
 { V<pqc&f .  
  CAboutDlg dlgAbout; UmE{>5Pt  
  dlgAbout.DoModal(); q{ 1U  
 } [Z+,)-ke  
 else .%<&W1  
 { oMe]dK  
  CDialog::OnSysCommand(nID, lParam); 4<K`yU]"  
 } T6r~OV5  
} z{jAt6@7  
gWo~o]f  
void CCaptureDlg::OnPaint() W>bW1h  
{ ;wxt<   
 if (IsIconic()) `6$b1qv,  
 { j1C.#-P[  
  CPaintDC dc(this); // device context for painting Umt ia~x=&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `VE&Obp[  
  // Center icon in client rectangle \KXEw2S  
  int cxIcon = GetSystemMetrics(SM_CXICON); I yN9 +  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'uzv\[  
  CRect rect; F s\P/YX  
  GetClientRect(&rect); L,pSdeq  
  int x = (rect.Width() - cxIcon + 1) / 2; ejY5n2V#=  
  int y = (rect.Height() - cyIcon + 1) / 2; JW [\"`x!  
  // Draw the icon .6F3;bg R7  
  dc.DrawIcon(x, y, m_hIcon); uW9M&"C~  
 } b[;3KmUB  
 else J\$l3i/I  
 { 3F}KrG  
  CDialog::OnPaint(); M9g\/]Io;  
 } m=,c,*>  
} C'2 =0oou  
y]_8. 0zM  
HCURSOR CCaptureDlg::OnQueryDragIcon() o'C.,ic?C  
{ ,HkhKbQ  
 return (HCURSOR) m_hIcon; e=UVsYNx  
} /B\-DP3K  
{/xs9.8:JX  
void CCaptureDlg::OnCancel() O)JUY *&I5  
{ I*S`I|{J  
 if(bTray) Z"|P(]A  
  DeleteIcon(); uEGPgYY(  
  CDialog::OnCancel(); tZCe?n]  
} WTYFtZD[yH  
m{.M,Lm:  
void CCaptureDlg::OnAbout() [ky6E*dV`  
{ qZsddll  
 CAboutDlg dlg; E5BgQ5'  
 dlg.DoModal(); tm1UH 4  
} n_n|^4 w  
,Zf!KQw  
void CCaptureDlg::OnBrowse() r82o[+$u0K  
{ IPR tm!  
 CString str; T|s0qQi  
 BROWSEINFO bi; +aw>p_\  
 char name[MAX_PATH]; f THun?Vn  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .e2A*9,  
 bi.hwndOwner=GetSafeHwnd(); 'cF%4F  
 bi.pszDisplayName=name; 7 Jx-W|  
 bi.lpszTitle="Select folder"; >`<2}Me6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; c\MsVH2 |  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); OW^2S_H5  
 if(idl==NULL) gGX0+L@E  
  return; {rvbo1t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ZutB_uW  
 str.ReleaseBuffer(); &u1g7# #  
 m_Path=str; 2>}\XKF).  
 if(str.GetAt(str.GetLength()-1)!='\\') ^~6]0$yJ  
  m_Path+="\\"; #jLaIXms  
 UpdateData(FALSE); [+l  
} OOBcJC  
O GFE*  
void CCaptureDlg::SaveBmp() !-5S8b  
{ W8,tl>(  
 CDC dc; crNjI`%tw  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .^LL9{?  
 CBitmap bm; uPFHlT  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9vp%6[  
 int Height=GetSystemMetrics(SM_CYSCREEN); `B'4"=(  
 bm.CreateCompatibleBitmap(&dc,Width,Height); A }-&C  
 CDC tdc; O5^J!(.O\Z  
 tdc.CreateCompatibleDC(&dc); >I d!I  
 CBitmap*pOld=tdc.SelectObject(&bm); <4Q12:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Vj=Xcn#*8  
 tdc.SelectObject(pOld); e$Bf[F#;-  
 BITMAP btm; Cfr<D3&,]  
 bm.GetBitmap(&btm); Xn/ n|[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {x[;5TM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7V} ]C>G  
 BITMAPINFOHEADER bih; CzSZ>E$%U  
 bih.biBitCount=btm.bmBitsPixel; jJUGZVM6)  
 bih.biClrImportant=0; B`*f(  
 bih.biClrUsed=0; $7UoL,N>  
 bih.biCompression=0; 3ximNQ} S  
 bih.biHeight=btm.bmHeight; Q sg/ V]  
 bih.biPlanes=1; d@4rD}_Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7$ =Y\ P  
 bih.biSizeImage=size; W-z90k4Z5  
 bih.biWidth=btm.bmWidth; P{S\pWZkk  
 bih.biXPelsPerMeter=0; rBD(2M  
 bih.biYPelsPerMeter=0; hj&fQ}X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j,C,5l=  
 static int filecount=0; x6^l6N  
 CString name; <&5m N  
 name.Format("pict%04d.bmp",filecount++); oTCzYY  
 name=m_Path+name; &|.hkR2k  
 BITMAPFILEHEADER bfh; iuC7Y|  
 bfh.bfReserved1=bfh.bfReserved2=0; p^1zIC>F  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +Qh[sGDdY  
 bfh.bfSize=54+size; \ ]   
 bfh.bfOffBits=54; :zdEq" )v  
 CFile bf; 9 Uha2o  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .xGo\aD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;} lT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O' +"d%2'  
  bf.WriteHuge(lpData,size); =)I"wR"v$  
  bf.Close(); EntF@ln!  
  nCount++; 7%}ay  
 } l{Jt sI  
 GlobalFreePtr(lpData); ZFS7{:  
 if(nCount==1) $. %L  
  m_Number.Format("%d picture captured.",nCount); "h=6Q+Ze  
 else AF^T~?t  
  m_Number.Format("%d pictures captured.",nCount); l~bKBz  
  UpdateData(FALSE); . yZm^&  
} &E bI Op  
 ep+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?Jt$a;  
{ 8|O=/m^]  
 if(pMsg -> message == WM_KEYDOWN) /X4yB"J>  
 { CI`N8 f=v  
  if(pMsg -> wParam == VK_ESCAPE) o`bo#A  
   return TRUE; xS'zZ%?  
  if(pMsg -> wParam == VK_RETURN) &lAQ &  
   return TRUE; A\K,_&x1Z  
 } )QmGsU}?  
 return CDialog::PreTranslateMessage(pMsg); 6*IpAIh  
} 57~Uqt  
V vu(`9u]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?O??cjiA@  
{ >1 @Ltvm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;DuXS y!g  
  SaveBmp(); y&"!m }  
  return FALSE; 7+}JgUh  
} #~^btL'dHF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dpwD8Q< U  
 CMenu pop; $I@GUtzjp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5IW8=$k~.)  
 CMenu*pMenu=pop.GetSubMenu(0); -ynBi;nH  
 pMenu->SetDefaultItem(ID_EXITICON); n@!wp/J,  
 CPoint pt; I&Jt> O4  
 GetCursorPos(&pt); c'Z: 9?#5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Nt]qVwUm'Y  
 if(id==ID_EXITICON) fW?sYC'  
  DeleteIcon(); ;+ azeW ^  
 else if(id==ID_EXIT) ju|]Qlek  
  OnCancel(); @x1 %)1  
 return FALSE; vJ"i.:Gf4  
}  G2`${aMS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); u%u&F^y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }aF  
 AddIcon(); 5RF4]$zT  
 return res; ;I}'}  
} h[kU<mU"T  
3J~0O2  
void CCaptureDlg::AddIcon() rn8cdM N  
{ O0T/#<Cn!  
 NOTIFYICONDATA data; Xc*U+M >U  
 data.cbSize=sizeof(NOTIFYICONDATA); 5\bJR0I@  
 CString tip; 5G[x}4U  
 tip.LoadString(IDS_ICONTIP); $A2n{  
 data.hIcon=GetIcon(0); p@~ic#X  
 data.hWnd=GetSafeHwnd(); Qd]we$ G  
 strcpy(data.szTip,tip); H4:&%"j7  
 data.uCallbackMessage=IDM_SHELL; Zd!U')5/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; edipA P~!  
 data.uID=98; Es!Q8.  
 Shell_NotifyIcon(NIM_ADD,&data); a~PK pw2%  
 ShowWindow(SW_HIDE); ;AX8aw,  
 bTray=TRUE; D+JAK!W  
} 29&bbfU  
:"Y*<=x#2  
void CCaptureDlg::DeleteIcon() Vi *e@IP/  
{ Kcy@$uF{2  
 NOTIFYICONDATA data; DF_X  
 data.cbSize=sizeof(NOTIFYICONDATA); Z hd#:d  
 data.hWnd=GetSafeHwnd(); ,WD X(  
 data.uID=98; jQS 6J+F]  
 Shell_NotifyIcon(NIM_DELETE,&data); dOFD5}_   
 ShowWindow(SW_SHOW); o`n$b(VZ  
 SetForegroundWindow(); 7fHc[,  
 ShowWindow(SW_SHOWNORMAL); q{0R=jb  
 bTray=FALSE; V5i*O3a~   
} ea'&xs#GK  
JH8}Ru%Z  
void CCaptureDlg::OnChange() cxIk<&i~(  
{ ]bZ(HC?KZr  
 RegisterHotkey(); PPkx4S_>  
} W,XTF  
>w+HHs/$wK  
BOOL CCaptureDlg::RegisterHotkey() 1vzb8.  
{ Q GZyL)Q  
 UpdateData(); 2ZcKK8X;7  
 UCHAR mask=0; y5r4+2B  
 UCHAR key=0; 7 aV%=_  
 if(m_bControl) qpIC{'A.  
  mask|=4; F+m }#p  
 if(m_bAlt) R :X0'zeRr  
  mask|=2; V#REjsf,t-  
 if(m_bShift) N@ \&1I`c$  
  mask|=1; ~6YMD  
  key=Key_Table[m_Key.GetCurSel()]; '2^7-3_1  
 if(bRegistered){ 21hv%CF\9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \K`L3*cBKK  
  bRegistered=FALSE; 0:w"M<80  
 } ,#MCn  
 cMask=mask; #$1Z  
 cKey=key; jTO), v:w  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); h2ytS^  
 return bRegistered; MZ+^-@X  
} }>)[<;M>%  
pRkP~ZISU  
  四、小结 <sK4#!K  
.<@8gNm3  
  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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