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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: )`u17 {  
  kB7vc>@1  
  一、实现方法 !NXjax\r  
$%<{zWQm  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ?|nl93m  
7#V7D6j1  
#pragma data_seg("shareddata") IpP%WW u  
HHOOK hHook =NULL; //钩子句柄 wwUI ;g  
UINT nHookCount =0; //挂接的程序数目 P"YdB|I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 YW}$eW*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x.SfB[SZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey i'>6Qo  
static int KeyCount =0; vgfC{]v<W]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^_7|b[Bt  
#pragma data_seg() oV|O`n  
({f}Z-%  
  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。 !`69.v  
9:j?Jvw$  
  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: Ox3=1M0  
6FUW^dt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR YEL0h0gn  
cKey,UCHAR cMask) 2M %j-yG"  
{ W5*ldXXk  
 BOOL bAdded=FALSE; 5{ c;I<0  
 for(int index=0;index<MAX_KEY;index++){ @CprC]X  
  if(hCallWnd[index]==0){ aukcO ;oG<  
   hCallWnd[index]=hWnd; tpfgUZ{  
   HotKey[index]=cKey; JGs: RD'  
   HotKeyMask[index]=cMask; --yF%tRMP  
   bAdded=TRUE; h\s/rZg=r  
   KeyCount++; ] l,BUf-O  
   break; vygzL U^  
  } ' \JE>#  
 } ]#tB[G  
 return bAdded; !3Q0Ahf  
} ~#_~DqbMZ5  
//删除热键 :@A&HkF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y },E3<  
{ ~Y 6'sM|  
 BOOL bRemoved=FALSE; O<u=Vz3c~0  
 for(int index=0;index<MAX_KEY;index++){ S{c/3k~  
  if(hCallWnd[index]==hWnd){ _~kw^!p>Kr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'Wlbh:=$  
    hCallWnd[index]=NULL;  Nx}nOm  
    HotKey[index]=0; *PJH&g#Ge  
    HotKeyMask[index]=0; ZU4=&K  
    bRemoved=TRUE; v"*r %nCi  
    KeyCount--; a:FU- ^B4~  
    break; O-?rFNavxp  
   } IH|zNg{\Y  
  } qmS9*me {  
 } mF4W4~"  
 return bRemoved; 5ggyk0  
} qu=~\t1[6  
Jo?LPR \6  
^q7V%{54  
  DLL中的钩子函数如下: 2Q^ q$@L  
uEPp%&D.+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;6tra_  
{ g~lv/.CnA+  
 BOOL bProcessed=FALSE; ot0teNF  
 if(HC_ACTION==nCode) hkK>h  
 { ddn IKkOp  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 u I e^Me  
   switch(wParam) 7?.uAiM'zT  
   {  x:SjdT  
    case VK_MENU: w$]G$e  
     MaskBits&=~ALTBIT; kmQ:wf:  
     break; LdUz;sb  
    case VK_CONTROL: [2:d@=%.  
     MaskBits&=~CTRLBIT; ZO+RE7f*?c  
     break; SN6 QX!3  
    case VK_SHIFT: Ly= .  
     MaskBits&=~SHIFTBIT; A95f!a  
     break; Xdvd\H=  
    default: //judge the key and send message ;jP sS^X  
     break;  2&6D`{"P  
   } TTf j 5  
   for(int index=0;index<MAX_KEY;index++){ NdK`-RT  
    if(hCallWnd[index]==NULL) pb!2G/,.[  
     continue; :~-:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >a;a8EA<O  
    {  f<o|5r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 35h|?eN_m!  
     bProcessed=TRUE; `?VK(<w0q  
    } Gb')a/  
   } 9z,sn#-t  
  } O4rjGTRF  
  else if((lParam&0xc000ffff)==1){ //有键按下 &4Z8df!  
   switch(wParam) >d 5-if  
   { Ha v&vV  
    case VK_MENU: 7qC /a c  
     MaskBits|=ALTBIT; ;qmnG3;Q  
     break; GSA+A7sZ  
    case VK_CONTROL: :ez76oGyc  
     MaskBits|=CTRLBIT; [R]V4Hb  
     break; ~d*Q{v~3  
    case VK_SHIFT: AD;m[u7  
     MaskBits|=SHIFTBIT; Agd"m4!  
     break; <bcf"0A  
    default: //judge the key and send message 0\mf1{$"!7  
     break; Laj/~Ru6  
   } L*0YOE%=]  
   for(int index=0;index<MAX_KEY;index++){ pH~\~  
    if(hCallWnd[index]==NULL) 4LSs WO<@  
     continue; |W@ ~mrO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g;l K34{  
    { kNuvJ/St  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6(rm%c  
     bProcessed=TRUE; 8\J$\Edv  
    } ju2H 0AQ  
   } ZayJllaq^  
  } Y3@+aA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~/^fdGr  
   for(int index=0;index<MAX_KEY;index++){ !(*&P  
    if(hCallWnd[index]==NULL) lDS y$  
     continue; LWrYK i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FM]clC;X?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +|C@B`h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 :6n4i$  
   } 3MQHoxX  
  } WUS%4LL(  
 } yLRe'5#m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0>[]Da}  
} fR1L VLU  
b>5* G1  
  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: D;sG9Hky  
}$)~HmZw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4KH'S'eR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (-<hx~  
wOH:'sk["  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Q g/Rw4[  
x(?Rm,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E8C8kH]  
{ (XK,g;RoEn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) QRQ{Bq}#  
 { gY+d[3N  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p3_ Qx  
  SaveBmp(); SX,$ $43  
  return FALSE; <gPM/ 4$G  
 } k7uX!}  
 …… //其它处理及默认处理 ~,,r\Y+  
} c{^1`(#?  
=t N}4  
oVK?lQ~y  
  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。 E}Cz(5  
,RV>F_  
  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。 nLL2/!'n  
.QY>@b\  
  二、编程步骤 i59 }6u_f  
-|x7<$Hw  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; -.Wwo(4  
drpx"d[c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G!%m~+",  
n)N!6u  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; @Ez>?#z  
#ChTel  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 2fdN@iruB  
9q]f]S.L  
  5、 添加代码,编译运行程序。 `*[Kmb\  
PY|zN|  
三、程序代码 ZQ"dAR/y  
P%B|HnG^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL mN-O{k0\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +:Xg7H*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ e"1mdw"  
#if _MSC_VER > 1000 ^/%o I;O{  
#pragma once a<*+rGI  
#endif // _MSC_VER > 1000 '*[7O2\%/  
#ifndef __AFXWIN_H__ 5NkF_&S_1  
#error include 'stdafx.h' before including this file for PCH eP (*.  
#endif Uhu?G0>O  
#include "resource.h" // main symbols 8K^#$,.."  
class CHookApp : public CWinApp xlcCL?qQj  
{  }<kl3{)  
 public: ;0Ua t  
  CHookApp(); N[9o6Nl|a  
  // Overrides Ri"rT] '  
  // ClassWizard generated virtual function overrides ^WU[+H ;  
  //{{AFX_VIRTUAL(CHookApp) xJ#O|7N  
 public: 5X8 i=M;  
  virtual BOOL InitInstance(); ?taC !{  
  virtual int ExitInstance(); 'h ?  
  //}}AFX_VIRTUAL /@Jg [na  
  //{{AFX_MSG(CHookApp) ^G qO>1U  
  // NOTE - the ClassWizard will add and remove member functions here. i=5!taxu}E  
  // DO NOT EDIT what you see in these blocks of generated code ! krGIE}5  
  //}}AFX_MSG O-0 5.  
  DECLARE_MESSAGE_MAP() 'RwfW|~6  
}; ^?|4<Rm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); BgN^].z&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t(<k4ji,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /?BTET  
BOOL InitHotkey(); IUAe6  
BOOL UnInit();  irh Z  
#endif 2K3j3|T  
l_2Xao$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6x5Q*^w  
#include "stdafx.h" -7oIphJ=\  
#include "hook.h" Z9H2! Cp  
#include <windowsx.h> Cm5L99Y  
#ifdef _DEBUG DmWa!5  
#define new DEBUG_NEW S^q^=q0F  
#undef THIS_FILE C-_u`|jQ  
static char THIS_FILE[] = __FILE__; r:rPzq1  
#endif Bd*Ok]  
#define MAX_KEY 100 ^69(V LK  
#define CTRLBIT 0x04 TN Z -0  
#define ALTBIT 0x02 Y 8}y0]V  
#define SHIFTBIT 0x01 9k4z__Ke  
#pragma data_seg("shareddata") p  Dg!Cs  
HHOOK hHook =NULL; %X}D(_  
UINT nHookCount =0; XiV*d06{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J*ofa>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  Z a,o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0(C[][a*u  
static int KeyCount =0; (gdzgLHy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3p-SpUvp  
#pragma data_seg() .: wg@Z  
HINSTANCE hins; rD6NUS  
void VerifyWindow(); cEXd#TlY~X  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <`q-#-V@  
//{{AFX_MSG_MAP(CHookApp) w3iX "w  
// NOTE - the ClassWizard will add and remove mapping macros here. ^^V+0 l  
// DO NOT EDIT what you see in these blocks of generated code! zWN]#W`  
//}}AFX_MSG_MAP 0LGHSDb  
END_MESSAGE_MAP() -0'< 7FSQ  
@6[aLF]F  
CHookApp::CHookApp() aR)UHxvX  
{ *?Oh%.HgF  
 // TODO: add construction code here, Mu.tq~b >  
 // Place all significant initialization in InitInstance 8u*Q^-fpo0  
} xt@v"P2Ok  
(RUc>Qi  
CHookApp theApp; )-6>!6hZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) SXXO#  
{ \HMuV g'Q  
 BOOL bProcessed=FALSE; yqJ>Z%)hf  
 if(HC_ACTION==nCode) ?t;,Nk`jx  
 { "SKv'*\b  
  if((lParam&0xc0000000)==0xc0000000){// Key up !!6@r|.  
   switch(wParam) `^g-2~  
   { |+-b#Sa9  
    case VK_MENU: Nog{w  
     MaskBits&=~ALTBIT; 3nq4Y'  
     break; 3"HEXJMc  
    case VK_CONTROL: Sw{rNzh%$  
     MaskBits&=~CTRLBIT; C:!&g~{cKi  
     break; X#W6;?Z\  
    case VK_SHIFT: B|>eKI  
     MaskBits&=~SHIFTBIT; I]#x0?D  
     break; QVb{+`.7  
    default: //judge the key and send message BL0xSNE**  
     break; kT^`j^Jr  
   } ? _[ q{i{  
   for(int index=0;index<MAX_KEY;index++){ H_iQR9Ak7  
    if(hCallWnd[index]==NULL) ?U:c\TA,m  
     continue; @q|c|X:I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (6)|v S  
    { Rs'mk6+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vN6)Szim  
     bProcessed=TRUE; 1<]?@[l<  
    } ;%AY#b4m  
   } T[ zEAj  
  } KrTlzbw&p\  
  else if((lParam&0xc000ffff)==1){ //Key down .%\R L/  
   switch(wParam) $-]9/Ct  
   { [ 7{cf`C  
    case VK_MENU: ! 4 "$O@U4  
     MaskBits|=ALTBIT; efyGjfoO  
     break; V' sq'XB  
    case VK_CONTROL: SphP@J<ONW  
     MaskBits|=CTRLBIT; w\JTMS$  
     break; &61h*s  
    case VK_SHIFT: -9 |)O:  
     MaskBits|=SHIFTBIT; 4?`*# DPl  
     break; :K*/  
    default: //judge the key and send message ;A?86o'?  
     break; :9|CpC`.  
   } [xDn=)`{V  
   for(int index=0;index<MAX_KEY;index++) C61E=$  
   { 7%|HtBXv^  
    if(hCallWnd[index]==NULL) X-yS9E  
     continue; fHF*#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C9%A?'`  
    { G Mg|#DV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); JGlp7wro  
     bProcessed=TRUE; (]"`>, ray  
    } >)F)@KAuN4  
   } YQ-V^e6  
  } S2V+%Z _J  
  if(!bProcessed){ *Fd(  
   for(int index=0;index<MAX_KEY;index++){ S8e?-rC  
    if(hCallWnd[index]==NULL) YB9)v5Nz(  
     continue; K &G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E**Hu9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UotLJa  
   } T\TKgO=)  
  } aslb^  
 } ~kZ? e1H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a^)@ }4  
} ZGS4P0$  
za5E{<0  
BOOL InitHotkey() a;G>56iw  
{ 0fw>/"v  
 if(hHook!=NULL){ Zx|VOl,;  
  nHookCount++; E7U.>8C  
  return TRUE; xQs._YY  
 } X<:Zx#J?i  
 else 7!g4`@!5M  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V4?]NFK  
  if(hHook!=NULL) U5;Y o+z  
   nHookCount++; LV]F?O[K=  
  return (hHook!=NULL); p=dM2>  
} ov Wm}!r  
BOOL UnInit() FQB6` M  
{ WHR6/H  
 if(nHookCount>1){ Hy2~D:34  
  nHookCount--; xtd1>|  
  return TRUE; AYoLpes  
 } ^%RIz!}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); f!}e*oX  
 if(unhooked==TRUE){ MJcWX|(y  
  nHookCount=0; i)M JP*  
  hHook=NULL; `_.(qg   
 } \x~},!l  
 return unhooked; O<+x=>_  
} Y-P?t+l  
xU;Q ~(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {xQ(xy  
{ "tU,.U  
 BOOL bAdded=FALSE; *qw//W   
 for(int index=0;index<MAX_KEY;index++){ n{z!L-x^b  
  if(hCallWnd[index]==0){ 3Ebkq[/*%  
   hCallWnd[index]=hWnd; 4nD U-P#f  
   HotKey[index]=cKey; CQET  
   HotKeyMask[index]=cMask; 82w=t  
   bAdded=TRUE; $+w-r#,  
   KeyCount++; fsV_>5I6  
   break; *|.-y->  
  } a(K^/BT  
 } NfXEW-  
 return bAdded; oedLe9!  
} e`t-:~'  
KqWt4{\8v`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f5vsxP)Y[  
{ X/<Q3AK  
 BOOL bRemoved=FALSE; }&/_ S  
 for(int index=0;index<MAX_KEY;index++){ +#7)'c  
  if(hCallWnd[index]==hWnd){ T']G:jkb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I :o.%5)  
    hCallWnd[index]=NULL; pa6-3c  
    HotKey[index]=0; F)uS2  
    HotKeyMask[index]=0; ]|K@0,  
    bRemoved=TRUE; -<@QR8:  
    KeyCount--; k`r`ZA(kQ-  
    break; =o,6iJ^?$m  
   } Qg gx:  
  } gP>`DPgb^  
 } KOVR=``"/  
 return bRemoved; R}0!F 2  
} mI3 \n  
8Rd*`]@[pk  
void VerifyWindow() (-hGb:  
{ 5c6?$v /  
 for(int i=0;i<MAX_KEY;i++){ yxL(mt8  
  if(hCallWnd!=NULL){ ~cW,B}  
   if(!IsWindow(hCallWnd)){ hD>cxo  
    hCallWnd=NULL; E9v_6d[  
    HotKey=0; F@kd[>/[  
    HotKeyMask=0; = GZ,P (  
    KeyCount--; >jg"y  
   } 2sahb#e )  
  } .L))EB  
 } 9\a;75a  
} "tg?V  
>Ef{e6  
BOOL CHookApp::InitInstance() vFl06N2  
{ ~Jx0#+z9V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); P^& =L&U  
 hins=AfxGetInstanceHandle(); (@;=[5+  
 InitHotkey(); #@K %Mx  
 return CWinApp::InitInstance(); 9 az{j 1  
} rCgoU xW`  
{K>}eO:K  
int CHookApp::ExitInstance() yDe#,|-p  
{ *BAR`+;U  
 VerifyWindow(); b&E9xD/;r  
 UnInit(); %H8s_O  
 return CWinApp::ExitInstance(); u%I |os]  
} ynU20g  
Gil mJ2<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Kz2s{y~?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s|o+ Im  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4~mmP.c  
#if _MSC_VER > 1000 ^Qa!{9o[  
#pragma once xHi.N*~D  
#endif // _MSC_VER > 1000 m}o4Vr;"  
;]sbz4?  
class CCaptureDlg : public CDialog 31k2X81;a  
{ Tt\G y  
 // Construction (|.rEaTA[1  
 public: oS Apa  
  BOOL bTray; <t"|wYAa_  
  BOOL bRegistered; wJu,N(U  
  BOOL RegisterHotkey(); vC>8:3Z aq  
  UCHAR cKey; eeu;A, @U  
  UCHAR cMask; aXRf6:\%  
  void DeleteIcon(); $I:&5o i  
  void AddIcon(); 1CpIK$/  
  UINT nCount; kNrN72qg  
  void SaveBmp(); s>1Wjz2M  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor IH$ZPux  
  // Dialog Data CKr5L  
  //{{AFX_DATA(CCaptureDlg) F<LRo}j"9Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; *^Xtorqo  
  CComboBox m_Key; B"=w9w]  
  BOOL m_bControl; XCUU(H  
  BOOL m_bAlt; ^QTtCt^:  
  BOOL m_bShift; 4g^Xe-  
  CString m_Path; ]@9ZUtU,;N  
  CString m_Number; 0mi$_Ld+  
  //}}AFX_DATA o2e gNTG  
  // ClassWizard generated virtual function overrides b_rHt s  
  //{{AFX_VIRTUAL(CCaptureDlg) ;kb);iT  
 public: :XaBCF*  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |h* rkLY  
 protected: b[os0D95  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R gTrj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o%sx(g=q6  
  //}}AFX_VIRTUAL 'jj|bN  
  // Implementation xmNs<mz  
 protected: e]q(fPK  
  HICON m_hIcon; 8m"jd+  
  // Generated message map functions '4]_~?&x  
  //{{AFX_MSG(CCaptureDlg) =dDr:Y<@*  
  virtual BOOL OnInitDialog(); r0(*]K:.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]o3K  
  afx_msg void OnPaint(); EaUO>S  
  afx_msg HCURSOR OnQueryDragIcon(); #d;/Me  
  virtual void OnCancel(); 4"~l^yK  
  afx_msg void OnAbout(); Z|6,*XEc   
  afx_msg void OnBrowse(); =Cg1I\  
  afx_msg void OnChange(); s{ dgUX  
 //}}AFX_MSG K0C3s  
 DECLARE_MESSAGE_MAP() x_$`#m{hL5  
}; Zj5B}[,l\  
#endif Ge+T[  
ibn(eu<uW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M" R= ;n  
#include "stdafx.h" `Tk GI0q  
#include "Capture.h" ;<N%D=;}@  
#include "CaptureDlg.h" $~r_&1  
#include <windowsx.h> <tT.m[qg  
#pragma comment(lib,"hook.lib") Z+g9!@'a  
#ifdef _DEBUG Q]hl+C$d"/  
#define new DEBUG_NEW g`r4f%O  
#undef THIS_FILE w:c9Z=KX  
static char THIS_FILE[] = __FILE__; Z,1b$:+  
#endif ~>B`T%=H  
#define IDM_SHELL WM_USER+1 r}i}4K[1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =:;K nS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0I['UL^!F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X<mlaXwrA  
class CAboutDlg : public CDialog k<}3_   
{ r<c&;*  
 public:  KGJ *h  
  CAboutDlg(); _:7:ixN[Ie  
  // Dialog Data fprP$MbI  
  //{{AFX_DATA(CAboutDlg) ae0t *;~  
  enum { IDD = IDD_ABOUTBOX }; (d>}Fp  
  //}}AFX_DATA DVz_;m6)  
  // ClassWizard generated virtual function overrides p-XO4Pc 6  
  //{{AFX_VIRTUAL(CAboutDlg) L25%KGg' o  
 protected: ]8/g[Ii  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0,5)L\{ R  
  //}}AFX_VIRTUAL -OXC;y  
  // Implementation V_/.]zQA  
 protected: TX).*%f [r  
  //{{AFX_MSG(CAboutDlg) N~~ sM"n  
  //}}AFX_MSG hMnm>  
  DECLARE_MESSAGE_MAP() ;b_l/T(  
}; \[&&4CN{  
,)M/mG?,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @UQ421Z`  
{ ]\m >N]P]  
 //{{AFX_DATA_INIT(CAboutDlg) qPoN 8>.  
 //}}AFX_DATA_INIT bCqTubbx!t  
} |Pi! UZB  
xO&qo8*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) " 6ScVa5)  
{ .,F`*JVFq  
 CDialog::DoDataExchange(pDX); aUk]wiwIR9  
 //{{AFX_DATA_MAP(CAboutDlg) 2#oU2si   
 //}}AFX_DATA_MAP _F},Wp:Oh  
} Lu CiO  
X^Fc^U8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?&?5x%|.<  
 //{{AFX_MSG_MAP(CAboutDlg) qs!A)H#  
 // No message handlers i2+_~$f  
 //}}AFX_MSG_MAP *Gul|Lp$<I  
END_MESSAGE_MAP() ]-;MY@  
spT$}F2n  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >R}G  
: CDialog(CCaptureDlg::IDD, pParent) NG_7jZzXA9  
{ a:Nf +t  
 //{{AFX_DATA_INIT(CCaptureDlg) 3,?LpdTS  
  m_bControl = FALSE; IG&twJR  
  m_bAlt = FALSE; D)tL}X$  
  m_bShift = FALSE; "!ks7:}v  
  m_Path = _T("c:\\"); foUB/&Ee  
  m_Number = _T("0 picture captured."); 0< 93i   
  nCount=0; -9Dr;2\  
  bRegistered=FALSE;  :!Nx'F9a  
  bTray=FALSE; #>6Jsnv1  
 //}}AFX_DATA_INIT X0Wx\xDg[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R@){=8%z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d hjX[7Bl9  
} SY.ZEJcv  
<nTZs`$LwL  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zx5#eMD  
{ |DYgc$2pN  
 CDialog::DoDataExchange(pDX); G=]ox*BY  
 //{{AFX_DATA_MAP(CCaptureDlg) td7Of(k'  
  DDX_Control(pDX, IDC_KEY, m_Key); &0i$Y\g  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Fw:_O2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); e07u@_'^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >gDeuye  
  DDX_Text(pDX, IDC_PATH, m_Path); !jvl"+_FV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3CH> !QOA  
 //}}AFX_DATA_MAP fN/;BT  
} (&Rql7](8  
7>=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0SQrz$y  
//{{AFX_MSG_MAP(CCaptureDlg) }Ogb|8  
 ON_WM_SYSCOMMAND() bh(} f.@ 9  
 ON_WM_PAINT() ?) T@qn+  
 ON_WM_QUERYDRAGICON() @]!9;?so  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6_:I~TTX  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Fv*Et-8tN5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e_"m\e#N  
//}}AFX_MSG_MAP D5!#c-Y-  
END_MESSAGE_MAP() 1_};!5$.  
1tLEKSo+  
BOOL CCaptureDlg::OnInitDialog() --EDr>'D5P  
{ S+"Bq:u"  
 CDialog::OnInitDialog(); uW [yNwM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3b|=V  
 ASSERT(IDM_ABOUTBOX < 0xF000); Gu@C* .jj!  
 CMenu* pSysMenu = GetSystemMenu(FALSE); E*h!{)z@F  
 if (pSysMenu != NULL) YmpaLZJ  
 { AOJ[/YpM  
  CString strAboutMenu; !C h1q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,Js-'vX  
  if (!strAboutMenu.IsEmpty()) % m"Qg<  
  { ,,!P-kK$  
   pSysMenu->AppendMenu(MF_SEPARATOR); |]9L#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zk"8mTg  
  } 9)t[YE:U3!  
 } @]]&^ 7  
 SetIcon(m_hIcon, TRUE); // Set big icon 9g\;L:'  
 SetIcon(m_hIcon, FALSE); // Set small icon TyjZ  
 m_Key.SetCurSel(0); *AP"[W  
 RegisterHotkey(); F{.\i*$  
 CMenu* pMenu=GetSystemMenu(FALSE); mz+UkA'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fs?H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )ki Gk}2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^`B;SSV  
 return TRUE; // return TRUE unless you set the focus to a control l4dG=x}M]  
} Oi zj |'  
z1]nC]2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;rF[y7\  
{ r<4j;"lQK  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6ypLE@Mk  
 { .rITzwgB  
  CAboutDlg dlgAbout; 1= 7ASS9  
  dlgAbout.DoModal(); UhrRB  
 } m"'} {3$%  
 else CmV &+C$V%  
 { !\$V?*p7  
  CDialog::OnSysCommand(nID, lParam); W+/_0GgQ3  
 } (^(l=EN-<  
} >:4`y"0  
jCXBp>9$M  
void CCaptureDlg::OnPaint() &q@brX<,=  
{ .6T0d 4,1  
 if (IsIconic()) Q4hY\\Hi  
 { Rk[a|T&  
  CPaintDC dc(this); // device context for painting L~^5Ez6U  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q2s0g*z  
  // Center icon in client rectangle cdh0b7tj n  
  int cxIcon = GetSystemMetrics(SM_CXICON); r~2hTie  
  int cyIcon = GetSystemMetrics(SM_CYICON); UfPHV%Wd  
  CRect rect; 0Sz[u\w  
  GetClientRect(&rect); vg5_@7  
  int x = (rect.Width() - cxIcon + 1) / 2; ;kY~-Om  
  int y = (rect.Height() - cyIcon + 1) / 2; pu+Q3NfR  
  // Draw the icon "TJ*mN.i{}  
  dc.DrawIcon(x, y, m_hIcon); mLpM8~L  
 } m./PRV1$x  
 else amdgb,vh  
 { } c k <R  
  CDialog::OnPaint(); ruGeN  
 } ,`k&9o7  
} Dsp$Nr%*  
fggs ;Le  
HCURSOR CCaptureDlg::OnQueryDragIcon() D[#V  
{ Y)DX   
 return (HCURSOR) m_hIcon; =u?aP}zc  
} -YAtM-VL  
|oke)w=gn  
void CCaptureDlg::OnCancel() QxdC[t$Lp  
{ B ~N3k  
 if(bTray) Qj;{Z*l%+  
  DeleteIcon(); {x.0Yh7  
  CDialog::OnCancel(); V^&*y+  
} 5.oIyC^Ik  
1kKfFpN  
void CCaptureDlg::OnAbout() g+4y^x(X@1  
{ P3: t 4^  
 CAboutDlg dlg; TKv!wKI  
 dlg.DoModal(); I](a 5i  
} C[G+SA1&W  
|Rz.Pt6  
void CCaptureDlg::OnBrowse() DegbjqZ#  
{ O"+0 b|  
 CString str; GaG>0 x   
 BROWSEINFO bi; 8>,w8(Nt  
 char name[MAX_PATH]; `H6~<9r  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3>-h- cpMX  
 bi.hwndOwner=GetSafeHwnd(); #$- E5R;x  
 bi.pszDisplayName=name; T"W<l4i-  
 bi.lpszTitle="Select folder"; +IWH7qRtp  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; #YYJ4^":k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~cCMLK em  
 if(idl==NULL) @)uV Fw"\  
  return; twq~.:<o  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jh)@3c  
 str.ReleaseBuffer(); (+epRC  
 m_Path=str; fDf[:A,8  
 if(str.GetAt(str.GetLength()-1)!='\\') DJL.P6-W  
  m_Path+="\\"; $VvgzjrH  
 UpdateData(FALSE); &]#L'D!"  
} $vfgYl4q  
R-S<7Q3E0=  
void CCaptureDlg::SaveBmp() #%\0][Xf  
{ {9U!0h-2"  
 CDC dc; /oHCV0!0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [jzsB:;XB&  
 CBitmap bm; O*~z@"\  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;na%*G`  
 int Height=GetSystemMetrics(SM_CYSCREEN); < ,*\t  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {g<D:"Q  
 CDC tdc; >ep<W<b  
 tdc.CreateCompatibleDC(&dc); 31a,i2Q4  
 CBitmap*pOld=tdc.SelectObject(&bm); \X:e9~  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); oT):#,s  
 tdc.SelectObject(pOld); M}x%'=Pox  
 BITMAP btm; **Ioy+  
 bm.GetBitmap(&btm); hr fF1 >A  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; G XVx/) H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vTO9XHc E  
 BITMAPINFOHEADER bih; );7 d_#  
 bih.biBitCount=btm.bmBitsPixel; ,G t!nm_  
 bih.biClrImportant=0; QDg5B6>$  
 bih.biClrUsed=0; @@Ybg6.+*  
 bih.biCompression=0; N3|:MMl  
 bih.biHeight=btm.bmHeight; MO8}i?u=z  
 bih.biPlanes=1; FOsd{Fw  
 bih.biSize=sizeof(BITMAPINFOHEADER); U`ttT5;  
 bih.biSizeImage=size; !H\o Qv-I  
 bih.biWidth=btm.bmWidth; M?eP1v:<+G  
 bih.biXPelsPerMeter=0; pT]hPuC  
 bih.biYPelsPerMeter=0; G+8)a$?v  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Nh.+woFq4  
 static int filecount=0; {Ya$Q#l  
 CString name; Uz^N6q  
 name.Format("pict%04d.bmp",filecount++); (BVqmi{  
 name=m_Path+name; C e-ru)  
 BITMAPFILEHEADER bfh; &-yRa45?  
 bfh.bfReserved1=bfh.bfReserved2=0; Fvl\.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5wx_ol}2  
 bfh.bfSize=54+size; Xfq`k/ W  
 bfh.bfOffBits=54; yS W$zA,  
 CFile bf; '^m.vS!/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3\XNOJH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .n]"vpWm[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j#5a&Z  
  bf.WriteHuge(lpData,size); ,=u;1  
  bf.Close(); sm/a L^4  
  nCount++; Jw;~$  
 } @*YF!LdU{M  
 GlobalFreePtr(lpData);  !Ld5Y$  
 if(nCount==1) =6[.||9  
  m_Number.Format("%d picture captured.",nCount); u?Ffqt9'  
 else SH?McBxS  
  m_Number.Format("%d pictures captured.",nCount); #Q8_:dPY  
  UpdateData(FALSE); x.+T65X~4  
} %Rc#/y  
xpR`fq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1&=)Bxg4  
{ XjGS.&'I  
 if(pMsg -> message == WM_KEYDOWN) >&PM'k  
 { k<<x}=  
  if(pMsg -> wParam == VK_ESCAPE) VhUWws3E  
   return TRUE; U#[&(  
  if(pMsg -> wParam == VK_RETURN) 1!v{#w{u7  
   return TRUE; S; % &X  
 } <a6pjx>y  
 return CDialog::PreTranslateMessage(pMsg); 6nW)2LV  
} zr.\7\v  
k: Pn.<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gXdMGO>  
{ kK[4uQQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Pao^>rj  
  SaveBmp(); u9hd%}9Qd?  
  return FALSE; yJ $6vmQ  
} Njc@5*rJ &  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VHD+NY/  
 CMenu pop; RpivO,   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lx:$EJ  
 CMenu*pMenu=pop.GetSubMenu(0); 6'Q{xJe?  
 pMenu->SetDefaultItem(ID_EXITICON); <L-F3Buu  
 CPoint pt; n~I-mR)"  
 GetCursorPos(&pt); >@2<^&K`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {<,%_pJR  
 if(id==ID_EXITICON) :<J7g`f  
  DeleteIcon(); ^9Pr`\   
 else if(id==ID_EXIT) :V'99Esv`  
  OnCancel(); "v1{  
 return FALSE; 5kiW@{m  
} 0caZ_-zU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1rm\u%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =tOB fRM  
 AddIcon(); FiUQ2w4  
 return res; ~[ufL25K  
} B0@ Tz39=  
e|]e\Or>  
void CCaptureDlg::AddIcon() a^ %iAe  
{ pm6#azQ  
 NOTIFYICONDATA data; p) 8S]p]  
 data.cbSize=sizeof(NOTIFYICONDATA); o$No@~%v  
 CString tip; 1h$?,  
 tip.LoadString(IDS_ICONTIP); ;'7(gAE  
 data.hIcon=GetIcon(0); 4?R979  
 data.hWnd=GetSafeHwnd(); N p"p*O  
 strcpy(data.szTip,tip); xb;{<~`71  
 data.uCallbackMessage=IDM_SHELL; l0Q5q)U1A  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E-z5mX.2  
 data.uID=98; Vu$m1,/  
 Shell_NotifyIcon(NIM_ADD,&data); +RooU?Aq  
 ShowWindow(SW_HIDE); 7:jLZ!mgi  
 bTray=TRUE; 7f>=-sv  
} B>53+GyMV  
ok:uTeJI  
void CCaptureDlg::DeleteIcon() 2&1mI>:F  
{ 2aYBcPFQh#  
 NOTIFYICONDATA data; ot}erC2~  
 data.cbSize=sizeof(NOTIFYICONDATA); mku@n;Hl_  
 data.hWnd=GetSafeHwnd(); v;]rFc#Px[  
 data.uID=98; _?~%+Oz/  
 Shell_NotifyIcon(NIM_DELETE,&data); T8^9*]:@c!  
 ShowWindow(SW_SHOW); f^F;`;z  
 SetForegroundWindow(); V 0Bl6  
 ShowWindow(SW_SHOWNORMAL); >d + }$dB  
 bTray=FALSE; b$_81i  
} 7gC?<;\0  
[}L~zn6>?a  
void CCaptureDlg::OnChange() jK w 96  
{ G2` z?);1b  
 RegisterHotkey(); ~5KcbGD~  
} b80#75Bj>  
Y(PCc}/\  
BOOL CCaptureDlg::RegisterHotkey() k\f _\pj6  
{ meX2Y;  
 UpdateData(); J2z/XHS  
 UCHAR mask=0;  /qLO/Mim  
 UCHAR key=0; $[|(&8+7  
 if(m_bControl) ]m+%y+  
  mask|=4; n5}]C{s'  
 if(m_bAlt) OC=&!<  
  mask|=2; d(q1 ?{zr4  
 if(m_bShift) p@tg pFt  
  mask|=1; 0AB a&'h  
  key=Key_Table[m_Key.GetCurSel()]; p'jc=bL E  
 if(bRegistered){ =5|7S&{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); p<fCGU  
  bRegistered=FALSE; TLwxP"  
 } RjW wsC~B  
 cMask=mask; V^_A{\GK  
 cKey=key; {-Y;!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :iE b^F}  
 return bRegistered; `ASDUgx Mq  
} JK/{Ik F  
:;{M0  
  四、小结 As,`($=  
6v)TCj/  
  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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