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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: B'fb^n<  
  o_'p3nD  
  一、实现方法 h=:Q-?n-  
JfR %L q~  
  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: }2e? ?3  
Z4lO?S5%J  
#pragma data_seg("shareddata") ?Orxmxc 2  
HHOOK hHook =NULL; //钩子句柄 7x@A%2J  
UINT nHookCount =0; //挂接的程序数目 ^Y'HaneoM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >k'c' 7/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 kO}AxeQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey L|,!?cSAT  
static int KeyCount =0; -YCOP0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8|" XSN  
#pragma data_seg() 0|a(]a}V*j  
tQjLOv+?=  
  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。 :AE&Ny4  
{j7uv"|X7  
  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: ]bK=FIK2  
`5C,N!d8X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gntxNp[9T  
cKey,UCHAR cMask) TTKs3iTXz  
{ Ba!J"b]  
 BOOL bAdded=FALSE; PBp^|t]E>  
 for(int index=0;index<MAX_KEY;index++){ 7:2WgL o  
  if(hCallWnd[index]==0){ gy_>`16K  
   hCallWnd[index]=hWnd; sNLs\4v  
   HotKey[index]=cKey; |g//g\dd  
   HotKeyMask[index]=cMask; K|Di1)7=/  
   bAdded=TRUE; s mnS DS  
   KeyCount++; tfGHea)M  
   break; EUxGAj$-  
  } ;t|Ii8Ne  
 } zlEX+=3  
 return bAdded; o/+13C  
} ayfFVTy1d  
//删除热键 =,UWX3`f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MZT23 [+  
{ , T8>}U(  
 BOOL bRemoved=FALSE; "\3B^ e,  
 for(int index=0;index<MAX_KEY;index++){ [@5Ytv H  
  if(hCallWnd[index]==hWnd){ ])nPPf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Mw;sLsu  
    hCallWnd[index]=NULL; 3G(miP6  
    HotKey[index]=0; TZY3tUx0|G  
    HotKeyMask[index]=0; <psZQdH  
    bRemoved=TRUE; D"a~ #^  
    KeyCount--; ~x ]jB  
    break; L2[f]J%  
   } &FF"nE*  
  } #~<0t(3Q  
 } C,NJb+J  
 return bRemoved; T>NDSami  
} ZOZ+Y\uU  
;,?KI$K  
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  DLL中的钩子函数如下: `#;e)1  
`wDl<[V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XBp?w  
{ *U P@9D  
 BOOL bProcessed=FALSE; !X;1}  
 if(HC_ACTION==nCode) tF{D= ;G  
 { w tiny,6  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [< &oF  
   switch(wParam) Bg|5KOnd  
   {  B>0]. CK`  
    case VK_MENU: !'cl"\h  
     MaskBits&=~ALTBIT; xUa{1!Y8  
     break; P_Gw-`L5T  
    case VK_CONTROL: F!]lU`z)=  
     MaskBits&=~CTRLBIT; d~JKH&x<  
     break; $h*L=t(  
    case VK_SHIFT: VB, ?Mo}R  
     MaskBits&=~SHIFTBIT; qa0 yg8,<  
     break; yL2o}ZbS  
    default: //judge the key and send message hHT_V2*  
     break; Stu4t==U  
   } <U!`J[n%  
   for(int index=0;index<MAX_KEY;index++){ $**r(HV  
    if(hCallWnd[index]==NULL) w-t8C=Z  
     continue; 'U\<IL#U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6y9t(m  
    { !3*(N8_|#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 98uV6b~g  
     bProcessed=TRUE; aD=A^ktx  
    } :[hgxJu+  
   } '>' wK.  
  } b-{=s +:  
  else if((lParam&0xc000ffff)==1){ //有键按下 iX2]VRNxl  
   switch(wParam) cM$P`{QrM  
   { ).sRv6/c  
    case VK_MENU: @jsDq Ln  
     MaskBits|=ALTBIT; #nK>Z[  
     break; `O[};3O&  
    case VK_CONTROL: w (/aiV  
     MaskBits|=CTRLBIT; t\%HX.8[;%  
     break; R}4So1  
    case VK_SHIFT: s3R(vd  
     MaskBits|=SHIFTBIT; [`c^ 4 E  
     break; $0lD>yu  
    default: //judge the key and send message pJt,9e6  
     break; OVhE??#  
   } y6[IfcN  
   for(int index=0;index<MAX_KEY;index++){ .xH5fMj,"  
    if(hCallWnd[index]==NULL) v,4pp@8rv  
     continue; %|oJ>+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m6[0Kws&  
    { znaUBv_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^ml'?  
     bProcessed=TRUE; b{]z w pf  
    } @]-jl}:]  
   } fv9V7  
  } ZGYr$C~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t-0a7 1#e  
   for(int index=0;index<MAX_KEY;index++){ >V*mr{/1  
    if(hCallWnd[index]==NULL) !VI]oRgP  
     continue; hnc@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |qmu _x\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); % Cv D-![0  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y[K*57fs  
   } zN:K%AiGxe  
  } +L9Eqll  
 } c;n *AK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N,;5{y1;J  
} 6Qy@UfB  
,Qnd3[2[  
  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: 7|[mz> "d  
Ju :CMkv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8W#heW\-]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7TDy.]  
U2wbvXr5-  
  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: =MLcm^b  
yRfSJbzaf\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J1:1B ,^y  
{ W>p-u6u%E|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Wv/%^3  
 { t[oT-r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8_6Q~  
  SaveBmp();  OP x`u  
  return FALSE; j(k: @  
 } fI~Xmw+}}  
 …… //其它处理及默认处理 frT]5?{  
} \u>"s   
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%ve:hym*  
  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。 h}cy D7Wn  
f' aVV!  
  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。 S!3S4:]B^  
Ffv`kn@  
  二、编程步骤 isZAoYVu  
[5MJwRM^!;  
  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"; B{C??g8/  
J<dVT xK12  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yLdVd P  
Z]j*9#G1s  
  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; lobGj8uxq  
},>pDeX^P  
  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; 9lW;Nk*j:  
' )?f{  
  5、 添加代码,编译运行程序。 ghX|3lI\q  
Y))u&*RuT0  
三、程序代码 Mc%Nf$XQ  
#&m0WI1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $n+w$CI)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 7"w2$*4'0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +tk{"s^r*  
#if _MSC_VER > 1000 HaYE9/xS  
#pragma once }f8Uc+  
#endif // _MSC_VER > 1000 a(9L,v#?  
#ifndef __AFXWIN_H__ { Q`QX`#  
#error include 'stdafx.h' before including this file for PCH rZfN+S,g  
#endif 1QU:?_\6@t  
#include "resource.h" // main symbols ?}RSwl  
class CHookApp : public CWinApp ]Qfn(u=o  
{ bV8!"{  
 public: m"fNK$_d  
  CHookApp(); 20iq2  
  // Overrides @H7Wb}  
  // ClassWizard generated virtual function overrides +AHUp)  
  //{{AFX_VIRTUAL(CHookApp) ;3kj2}  
 public: =ZDAeVz3w  
  virtual BOOL InitInstance(); N^pJS6cJkl  
  virtual int ExitInstance(); sp5eVAd  
  //}}AFX_VIRTUAL &/uu)v  
  //{{AFX_MSG(CHookApp) nD)K}4  
  // NOTE - the ClassWizard will add and remove member functions here. <YOLxR  
  // DO NOT EDIT what you see in these blocks of generated code ! dd\n8f  
  //}}AFX_MSG 1 29q`u;  
  DECLARE_MESSAGE_MAP() cu%C"  
}; g"?Y+j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); {.De4]ANh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z%e8K(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3q'&j, ,^  
BOOL InitHotkey(); 59!Fkd3  
BOOL UnInit(); Ci<ATho  
#endif E[*Fz1>  
CWNx4)ZGw  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,daKC  
#include "stdafx.h" raCi 8  
#include "hook.h" _x? uU  
#include <windowsx.h> &CIVL#];e  
#ifdef _DEBUG g=2Rqi5  
#define new DEBUG_NEW Q^q1 ns;r  
#undef THIS_FILE OzQ -7|m'J  
static char THIS_FILE[] = __FILE__; ?@6/E<-Z$  
#endif >A<bBK#  
#define MAX_KEY 100 i-'9AYyw  
#define CTRLBIT 0x04 qpsv i.S  
#define ALTBIT 0x02 v $7EvFS  
#define SHIFTBIT 0x01 IR-dU<<9O  
#pragma data_seg("shareddata") g"L|n7_b  
HHOOK hHook =NULL; *0}3t <5  
UINT nHookCount =0; y8 KX<2s1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !Yw3 d   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9&2Vm;F_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey MzP7Py 8.  
static int KeyCount =0; PNA\ TXT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w,Lvt }  
#pragma data_seg() IZm(`b;t^  
HINSTANCE hins; %rF?dvb;?  
void VerifyWindow(); Hsihytdj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) RiTa \  
//{{AFX_MSG_MAP(CHookApp) C:uz6i1  
// NOTE - the ClassWizard will add and remove mapping macros here. _9?I A  
// DO NOT EDIT what you see in these blocks of generated code! Qq@G\eRo  
//}}AFX_MSG_MAP TeWMp6u,r  
END_MESSAGE_MAP() 9XHz-+bQ  
X5]TY]  
CHookApp::CHookApp() HoLv`JA  
{ h8Xg`C\  
 // TODO: add construction code here, #CnHf  
 // Place all significant initialization in InitInstance +MB!B9M@  
} g >'p>}t  
[J C:  
CHookApp theApp; !{82D[5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D!oc>K$B  
{ 3G meD/6  
 BOOL bProcessed=FALSE; e.*%K!(  
 if(HC_ACTION==nCode) O0:)X)b  
 { i z~ pGkt  
  if((lParam&0xc0000000)==0xc0000000){// Key up yCXrVN:`,  
   switch(wParam) AWjm~D-?  
   { Cv*x2KF G  
    case VK_MENU: [<,~3oRu  
     MaskBits&=~ALTBIT; Y9=(zOqv  
     break; *1'`"D~  
    case VK_CONTROL: y')RT R{>M  
     MaskBits&=~CTRLBIT; \NG C$p n  
     break; 1TM~*<Jb  
    case VK_SHIFT: a6h>=uT [  
     MaskBits&=~SHIFTBIT; 6ATtW+sN]  
     break; Qe'g3z>  
    default: //judge the key and send message kJAn4I.l  
     break; J@ L9p46,  
   } ;oNhEB:F  
   for(int index=0;index<MAX_KEY;index++){ &(a(W22O  
    if(hCallWnd[index]==NULL) '&FjW-`" G  
     continue; 3pXLSdxB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cM&2SRBZ  
    { &6j<ca  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /_\#zC[  
     bProcessed=TRUE; K?4FT$9G  
    } A;J MV+2N  
   } W><dYy=z5  
  } mF09U(ci  
  else if((lParam&0xc000ffff)==1){ //Key down QR> Y%4 ;h  
   switch(wParam) o:Zd1"Z  
   { 9]>iSG^H  
    case VK_MENU: M0c 9pE  
     MaskBits|=ALTBIT; }#v{`Sn%^C  
     break; C*I(|.i@  
    case VK_CONTROL: XTeb9h)3  
     MaskBits|=CTRLBIT; sLcFt1  
     break; )2Hff.  
    case VK_SHIFT:  jAND7&W  
     MaskBits|=SHIFTBIT; XjE>k!=I  
     break; =3 +l  
    default: //judge the key and send message &*&?0ov^"  
     break; cE{ =(OQ  
   } . -"E^f  
   for(int index=0;index<MAX_KEY;index++) 8V$3b?]  
   { {6d b{ ay_  
    if(hCallWnd[index]==NULL) d'l$$%zJ  
     continue; ArI]`h'W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^ie^VY($  
    { *o' 4,+=am  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ae?e 70bY  
     bProcessed=TRUE; ^+R:MBK  
    } 4Z)DDz-}V  
   } hxC!+ArVe  
  } GIv){[i  
  if(!bProcessed){ 2D([Z-<i  
   for(int index=0;index<MAX_KEY;index++){ ~ E=\t9r  
    if(hCallWnd[index]==NULL) m]IysyFFK  
     continue; (Btv ClZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,fnsE^}.U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TK>{qxt:=  
   } 1]\TI7/ n  
  } +#]|)V Z  
 } g-yi xU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~F#A Pt  
} gvnj&h.GV  
HP a|uDVv  
BOOL InitHotkey() LxT rG)4  
{ FBsn;,3<W  
 if(hHook!=NULL){ P 4;{jG  
  nHookCount++; =p&sl;PsLw  
  return TRUE; el'j&I  
 } acOJ]]  
 else * Zd_ HJi  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); St>`p-  
  if(hHook!=NULL) kb|eQtH  
   nHookCount++; Z~3u:[x";  
  return (hHook!=NULL); aed+C:N  
} "E>t, D  
BOOL UnInit() ARx0zI%N  
{ 3#Y3Dz`  
 if(nHookCount>1){ $o^e:Y , a  
  nHookCount--; `)[dVfxA  
  return TRUE; -3mgza  
 } /84bv=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); F^'v{@C  
 if(unhooked==TRUE){ #'>?:k  
  nHookCount=0; 4uX(_5#j  
  hHook=NULL; >%c*Xe  
 } 8U^D(jrz  
 return unhooked; d,R6` i  
} :l~EE!  
b%nkIPA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S\|^ULrH  
{ bag&BHw  
 BOOL bAdded=FALSE; 5OB]x?4]  
 for(int index=0;index<MAX_KEY;index++){ \/,g VT  
  if(hCallWnd[index]==0){ Wg(bD,  
   hCallWnd[index]=hWnd; ZT9IMihV  
   HotKey[index]=cKey; !BRcq~-.  
   HotKeyMask[index]=cMask; 6_U |(f  
   bAdded=TRUE; q2!'==h2i  
   KeyCount++; n4>cERf a  
   break; L*O>IQh2  
  } MW]8;`|jC  
 } p!GZCf,   
 return bAdded; {{E jMBg{  
} [` 'd#pR  
/:Y9sz uW`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f N0bIE Y  
{ i>"dBJh]b  
 BOOL bRemoved=FALSE; O3+)qb!X  
 for(int index=0;index<MAX_KEY;index++){ &Y=.D:z<  
  if(hCallWnd[index]==hWnd){ SKJW%(|3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N<"`ShCNM  
    hCallWnd[index]=NULL; _vIO !*h0  
    HotKey[index]=0; 1uC;$Aj6:  
    HotKeyMask[index]=0; 8{@`kyy|  
    bRemoved=TRUE; q\U4n[Zk  
    KeyCount--; od(:Y(4  
    break; fD(7F N8  
   } nF j-<!  
  } SJOmeN}4)  
 } 'f6PjI  
 return bRemoved; H%cp^G  
} CfY7<o1>  
V*~423  
void VerifyWindow() '&)D>@g  
{ FbBX}n  
 for(int i=0;i<MAX_KEY;i++){ 3XGB+$]C  
  if(hCallWnd!=NULL){ ;'hi9L  
   if(!IsWindow(hCallWnd)){ +]_nbWL(%  
    hCallWnd=NULL; J& )#G@fRX  
    HotKey=0; eB7>t@ED  
    HotKeyMask=0; H lF}   
    KeyCount--; `>\4"`I  
   } +/w(K,  
  } ^ePsIl1E  
 } O!yakU+  
} d>;2,srUf  
}ymc5-  
BOOL CHookApp::InitInstance() D-~G|8g  
{ e"PMvQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E;xMPK$  
 hins=AfxGetInstanceHandle(); VOg/VGJ  
 InitHotkey();  *[VEF  
 return CWinApp::InitInstance(); 0FTRm2(  
} jjX'_E  
w/O<.8+  
int CHookApp::ExitInstance() 6mi$.' qP  
{ 9ptZVv=O  
 VerifyWindow(); H/pcX j  
 UnInit(); L)1C'8 ).  
 return CWinApp::ExitInstance(); 70duk:Ri0  
} w[e0wh`.  
m';#R9\Fz  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \ibCR~W4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) jk K#e$7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }Z"28?  
#if _MSC_VER > 1000 9jqO/_7R+  
#pragma once g&q]@m  
#endif // _MSC_VER > 1000 2rF?Q?$,B  
&K+  
class CCaptureDlg : public CDialog *&(2`#C;  
{ 2wGF-V  
 // Construction Y+!Ouc!$  
 public: hx*HY%\P  
  BOOL bTray; *Ao2j;  
  BOOL bRegistered; aMBL1d7  
  BOOL RegisterHotkey(); P8"6"}B;T  
  UCHAR cKey; } /[_  
  UCHAR cMask; 7WgIhQ~  
  void DeleteIcon(); 5?Uo&e  
  void AddIcon(); 3fm;r5  
  UINT nCount; -)4uYK*  
  void SaveBmp(); txj wZ_p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Po'-z<}wS  
  // Dialog Data oSN8Xn*qr  
  //{{AFX_DATA(CCaptureDlg) Q^*G`&w,  
  enum { IDD = IDD_CAPTURE_DIALOG }; mYiSR   
  CComboBox m_Key; di"C]" ;  
  BOOL m_bControl; LKIW*M  
  BOOL m_bAlt; gCg4;b6g  
  BOOL m_bShift; XyvZ&d6(d  
  CString m_Path; )?F $-~7  
  CString m_Number; y T[Lzv#  
  //}}AFX_DATA gsLr=  
  // ClassWizard generated virtual function overrides NS7@8 #C  
  //{{AFX_VIRTUAL(CCaptureDlg) oP+kAV#]  
 public: 's$A+8;L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }l,T~Pjb  
 protected: t)\D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C<r(-qO{5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A)hq0FPp  
  //}}AFX_VIRTUAL ]jHgo](%  
  // Implementation ]]\)=F`n77  
 protected: 4C l, Iw/;  
  HICON m_hIcon; wrz+2EP`  
  // Generated message map functions q,<n,0)K  
  //{{AFX_MSG(CCaptureDlg) :hC {5!|  
  virtual BOOL OnInitDialog(); (! xg$Kz@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g,00'z_D  
  afx_msg void OnPaint(); @/CRIei  
  afx_msg HCURSOR OnQueryDragIcon(); g2+l@$W  
  virtual void OnCancel(); 2>!_B\%)H  
  afx_msg void OnAbout(); e*Uz# w:  
  afx_msg void OnBrowse(); 9X 5*{f Y  
  afx_msg void OnChange(); ArNur~  
 //}}AFX_MSG  6'RZ  
 DECLARE_MESSAGE_MAP() @?<N +qdH>  
}; /Oq1q._9F  
#endif S% JNxT7'  
2uvQf&,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^m6k@VM  
#include "stdafx.h" ddUjs8VvJ  
#include "Capture.h" v+xgxQGYH  
#include "CaptureDlg.h" :)KTZ  
#include <windowsx.h> /2g)Z!&+L  
#pragma comment(lib,"hook.lib") cJU!zG  
#ifdef _DEBUG (t]lP/  
#define new DEBUG_NEW p{mxk)A  
#undef THIS_FILE >uBV  
static char THIS_FILE[] = __FILE__; ^>,< *p  
#endif Bg+<*z-?e  
#define IDM_SHELL WM_USER+1 h]J&A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K^!e-Xi6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |@o]X?^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <.PPs:{8#  
class CAboutDlg : public CDialog L Q I: ]d  
{ QOkE\ro  
 public: cCo07R  
  CAboutDlg(); "TBQNWZ  
  // Dialog Data W (=Wg|cr  
  //{{AFX_DATA(CAboutDlg) E1Ru)k{B  
  enum { IDD = IDD_ABOUTBOX }; veYsctK~  
  //}}AFX_DATA ,<uiitOo  
  // ClassWizard generated virtual function overrides .LXh]I *  
  //{{AFX_VIRTUAL(CAboutDlg) ; McIxvj  
 protected: H6%!v1 u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &xGfkCP.]  
  //}}AFX_VIRTUAL ooLnJ Y#  
  // Implementation )Dk0V!%N  
 protected: } #\;np  
  //{{AFX_MSG(CAboutDlg) 0j a  
  //}}AFX_MSG 'f=)pc#&g  
  DECLARE_MESSAGE_MAP() _SBp66 r  
}; X]JpS  
:|n>H+Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ? RR Srr1  
{ 66^1&D"  
 //{{AFX_DATA_INIT(CAboutDlg) h30QCk  
 //}}AFX_DATA_INIT c{m ;"ZCFS  
} RB lOTQjv  
uh C=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |g?/~%7  
{ Uf7F8JZmM  
 CDialog::DoDataExchange(pDX); ;G%wc!  
 //{{AFX_DATA_MAP(CAboutDlg) .UT,lqEkv  
 //}}AFX_DATA_MAP we:5gK &  
} u'$yYzBE  
8}"f|6Wm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A1k&` |k   
 //{{AFX_MSG_MAP(CAboutDlg) qSpa4W[  
 // No message handlers #U!(I#^3  
 //}}AFX_MSG_MAP sO{0hZkc  
END_MESSAGE_MAP() -KIVnV=&m  
|oBdryi  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qOcG|UgF  
: CDialog(CCaptureDlg::IDD, pParent) PBAz` y2  
{ 9aF..  
 //{{AFX_DATA_INIT(CCaptureDlg) 282+1X  
  m_bControl = FALSE; ~P]HG;$?n  
  m_bAlt = FALSE; K)h"G#NZM  
  m_bShift = FALSE; +%Bf y4F6  
  m_Path = _T("c:\\"); <D;H} ef  
  m_Number = _T("0 picture captured."); nIT^'  
  nCount=0; < o'7{  
  bRegistered=FALSE; ?(,5eg  
  bTray=FALSE; ir@N>_  
 //}}AFX_DATA_INIT MOqA$b  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +}(B856+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3Q*RR"3  
} l9ifUh e  
!7ZfT?&  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9A} kkMB:  
{ 3|83Jnh  
 CDialog::DoDataExchange(pDX); H%NLL4&wu  
 //{{AFX_DATA_MAP(CCaptureDlg) G7_"^r%c9;  
  DDX_Control(pDX, IDC_KEY, m_Key); :`>+f.)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j3rv2W\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o$blPTN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #H|j-RM2  
  DDX_Text(pDX, IDC_PATH, m_Path); (;2J(GZ:$U  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u'~b<@wHB  
 //}}AFX_DATA_MAP L yA(.  
} ^zWO[$n}tP  
dnX`F5zd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X,!OWz:[  
//{{AFX_MSG_MAP(CCaptureDlg) 0m+5Zn  
 ON_WM_SYSCOMMAND() L$TKO,T  
 ON_WM_PAINT() "PX3%II  
 ON_WM_QUERYDRAGICON() Ji}IV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }_kI>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eZ.0,A*1B1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3R=3\;  
//}}AFX_MSG_MAP X_sG6Q@  
END_MESSAGE_MAP() 1M~:]}*<  
#g`cih=QL  
BOOL CCaptureDlg::OnInitDialog() $L#Z?76v  
{ 9CU6o:'fW  
 CDialog::OnInitDialog(); ^`>Ysc(@&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G4exk5  
 ASSERT(IDM_ABOUTBOX < 0xF000); a@=36gx)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xZ'` _x9l  
 if (pSysMenu != NULL) ;AL@<,8  
 { k89gJ5B$  
  CString strAboutMenu; Ye=7Y57Nr  
  strAboutMenu.LoadString(IDS_ABOUTBOX); zUUxxS_?  
  if (!strAboutMenu.IsEmpty()) zS"zb  
  { zRJKIm  
   pSysMenu->AppendMenu(MF_SEPARATOR); iQ}sp64  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ??%T  
  } :: 72~'tw  
 } q;a*gqt   
 SetIcon(m_hIcon, TRUE); // Set big icon ~lalc ^  
 SetIcon(m_hIcon, FALSE); // Set small icon GwpBDM k  
 m_Key.SetCurSel(0); M Xt +  
 RegisterHotkey(); % K7EF_%  
 CMenu* pMenu=GetSystemMenu(FALSE); _:=OHURc  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;!Z7-OZX  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }`/n2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); KjfKo;T  
 return TRUE; // return TRUE unless you set the focus to a control M>H^<N}'A  
} @61N[  
'S D|ObBY  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) er7/BE&  
{ Y./}zCT  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]-Y]Q%A4  
 { E0B2>V  
  CAboutDlg dlgAbout; |&RX>UW$W  
  dlgAbout.DoModal(); }}bi#G:R+  
 } H6CGc0NS+  
 else *rFbehfH  
 { .L{+O6*c  
  CDialog::OnSysCommand(nID, lParam); *2C79hi1  
 } ,, #rv-*  
} jc~*#\N  
/R$x-7t)^(  
void CCaptureDlg::OnPaint() W!0  
{ TN@JPoH  
 if (IsIconic()) I 3,e)Z  
 { Sq8Q *  
  CPaintDC dc(this); // device context for painting W]Tt8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); c^)E:J/  
  // Center icon in client rectangle nMdN$E  
  int cxIcon = GetSystemMetrics(SM_CXICON); nV xMo_  
  int cyIcon = GetSystemMetrics(SM_CYICON); FITaL@{c  
  CRect rect; S9#N%{8P  
  GetClientRect(&rect); {UC<I.5X  
  int x = (rect.Width() - cxIcon + 1) / 2; F`V[G(f+r  
  int y = (rect.Height() - cyIcon + 1) / 2; OQ&D?2r  
  // Draw the icon 3b[+m}UWQ  
  dc.DrawIcon(x, y, m_hIcon); svRaU7<UDN  
 } *k]S{]Y  
 else YeVc,B'  
 { 7^TXlW n^G  
  CDialog::OnPaint(); 18tQWI$  
 } $yqq.#1  
} 8+cpNX  
]`H.qV  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~#km0<r?  
{ W3/Stt$D  
 return (HCURSOR) m_hIcon; r<"/P`r  
} .EZ{d  
TaO;r=2  
void CCaptureDlg::OnCancel() j/mp.'P1k  
{ Z3~*R7G8>  
 if(bTray) % j{pz  
  DeleteIcon(); ^o\p|f>f  
  CDialog::OnCancel(); w>BFgb?  
} 6|qvo+%  
CuO*>g^K[  
void CCaptureDlg::OnAbout() `v2l1CQ: ^  
{ JJ=is}S|  
 CAboutDlg dlg; D % ,yA  
 dlg.DoModal(); !Jn w_)  
} Vzm+Ew _  
5GL+j%7  
void CCaptureDlg::OnBrowse() IX?%H!i  
{ <FT\u{9$  
 CString str; cP=mJ1  
 BROWSEINFO bi; $uB(@Ft.  
 char name[MAX_PATH]; /G+gk0FW  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'c{]#E1}  
 bi.hwndOwner=GetSafeHwnd(); ByvqwJY  
 bi.pszDisplayName=name; BXw,Rz }  
 bi.lpszTitle="Select folder"; A0u:Fm{E  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; O t<%gj;^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <X&:tZ #/  
 if(idl==NULL) L([>yQZ  
  return; ''Ec-b6Q-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); svjFy/T(lL  
 str.ReleaseBuffer(); EZRZ)h  
 m_Path=str; >g0@ Bk  
 if(str.GetAt(str.GetLength()-1)!='\\') R3`W#`  
  m_Path+="\\"; tSa%ZkS  
 UpdateData(FALSE); ,#OG/r-H  
} Y!$ z7K  
]3jH^7[?  
void CCaptureDlg::SaveBmp() CoXL;\  
{ j&GKpt  
 CDC dc; JjML!;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); j/|qge4  
 CBitmap bm; o}Np}PE6  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1*b%C"C  
 int Height=GetSystemMetrics(SM_CYSCREEN); /loN Outw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); bA,D]  
 CDC tdc; $Ws2g*i  
 tdc.CreateCompatibleDC(&dc); Z@A1+kUS  
 CBitmap*pOld=tdc.SelectObject(&bm); M'7x:Uw;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); m uY^Fx  
 tdc.SelectObject(pOld); jzMGRN/67  
 BITMAP btm; kO4~N-&  
 bm.GetBitmap(&btm); ;0q6 bp(<H  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; f+AIxSw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ox#4|<qM  
 BITMAPINFOHEADER bih; S-|$sV^cG  
 bih.biBitCount=btm.bmBitsPixel; IxR:a(  
 bih.biClrImportant=0; CZ}tQx5ga  
 bih.biClrUsed=0; k"zHrn"$  
 bih.biCompression=0; &>+Z$ZD  
 bih.biHeight=btm.bmHeight; C( ;7*]  
 bih.biPlanes=1; y&]D2"I  
 bih.biSize=sizeof(BITMAPINFOHEADER); SoIMftX  
 bih.biSizeImage=size; N6'Y N10  
 bih.biWidth=btm.bmWidth; 9z}kkYk  
 bih.biXPelsPerMeter=0; i+3b)xtW7  
 bih.biYPelsPerMeter=0; }clNXtN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); WLH2B1_):  
 static int filecount=0; Ta$<#wb  
 CString name; -+/|  
 name.Format("pict%04d.bmp",filecount++); t[~i})yS  
 name=m_Path+name; \v Go5`  
 BITMAPFILEHEADER bfh; tWI hbt  
 bfh.bfReserved1=bfh.bfReserved2=0; 5GP' cE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ccAEN  
 bfh.bfSize=54+size; #*@Yil=1  
 bfh.bfOffBits=54; :Fl:bRH+  
 CFile bf; <o}t-Bgg  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4r$t}t gX  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); p9J(,}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Ye\%o[X  
  bf.WriteHuge(lpData,size); d[de5Xra  
  bf.Close(); akoILX~u  
  nCount++; l|9`22G  
 } 4 @h6|=  
 GlobalFreePtr(lpData); 5E}i<}sq5  
 if(nCount==1) UQ y+ &;#5  
  m_Number.Format("%d picture captured.",nCount); EIAT*l:NW  
 else ^m\n[<x^  
  m_Number.Format("%d pictures captured.",nCount); FS[CUoA  
  UpdateData(FALSE); EBm\rM8  
} r38CPdE;}  
f,*e?9@;s  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +8"H%#~  
{ j*nCIxF  
 if(pMsg -> message == WM_KEYDOWN) 8dfx _kY`/  
 { )erPp@  
  if(pMsg -> wParam == VK_ESCAPE) 6|9fcIh]B  
   return TRUE; F7d f  
  if(pMsg -> wParam == VK_RETURN) ^`$KN0PY  
   return TRUE; mz''-1YY$  
 } >:Ec   
 return CDialog::PreTranslateMessage(pMsg); O<5bsKw'r  
} %3cBh v[q4  
4Y'qo M;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) azSS:=A  
{ -95 `.o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ' x|B'  
  SaveBmp(); iJAW| dw}  
  return FALSE; #"jWPe,d  
} rYT3oqpfT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N4r`czoj  
 CMenu pop; "dt3peH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9r!%PjNvE  
 CMenu*pMenu=pop.GetSubMenu(0); ,}[,]-nVx  
 pMenu->SetDefaultItem(ID_EXITICON); {.sF&(e   
 CPoint pt; \J6T:jeS,  
 GetCursorPos(&pt); }'3V(;9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _ ge3R3  
 if(id==ID_EXITICON) eL],\\q  
  DeleteIcon(); +I U]=qS  
 else if(id==ID_EXIT) tcs Z! #  
  OnCancel(); R8a xdV9(  
 return FALSE; NLj0\Pz|B  
} "C>KKs }  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  ^rI&BN@S  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -y~JNDS1]  
 AddIcon(); FQ[::*-  
 return res; y|X[NSA  
} *l|CrUa  
|_-FQ~Hf F  
void CCaptureDlg::AddIcon() 7eY*Y"GX  
{ D[<8(~VP  
 NOTIFYICONDATA data; R|_?yV[  
 data.cbSize=sizeof(NOTIFYICONDATA); :R _(+EK1  
 CString tip; KzhldMJ^zq  
 tip.LoadString(IDS_ICONTIP);  B} :[~R'  
 data.hIcon=GetIcon(0); K }r%OOn0  
 data.hWnd=GetSafeHwnd(); o rEo$e<  
 strcpy(data.szTip,tip); .n"aQ@!  
 data.uCallbackMessage=IDM_SHELL; <53~Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Lq yY??\@  
 data.uID=98; "g0L n5&  
 Shell_NotifyIcon(NIM_ADD,&data); hD;[}8qN{  
 ShowWindow(SW_HIDE); Z_S~#[\7^]  
 bTray=TRUE; h!$W^Tm2g  
} & %1XYpA.0  
-\LB>\;qn  
void CCaptureDlg::DeleteIcon() , !c.  
{ TfMuQi'>  
 NOTIFYICONDATA data; 4e9mN~  
 data.cbSize=sizeof(NOTIFYICONDATA); =6/0=a[  
 data.hWnd=GetSafeHwnd(); WPLAh_fe  
 data.uID=98; N[czraFBD}  
 Shell_NotifyIcon(NIM_DELETE,&data); U<*ZY`B3  
 ShowWindow(SW_SHOW); 5`0tG;  
 SetForegroundWindow(); faThXq8B  
 ShowWindow(SW_SHOWNORMAL); 7` &K=( .  
 bTray=FALSE; w$pBACX  
} \DpXs[1  
UT+B*?,h  
void CCaptureDlg::OnChange()  &+u$96  
{ F+|zCEc  
 RegisterHotkey(); *s<FEF  
} y$7<ZBG  
nJlrBf_Kj  
BOOL CCaptureDlg::RegisterHotkey() g6+}'MN:5  
{ Ydh]EO0'  
 UpdateData(); <T{PuS1<o  
 UCHAR mask=0; "^yTH/m  
 UCHAR key=0; IA! ( 'Ks  
 if(m_bControl) tGe|@.!  
  mask|=4; u-=%gx"Di  
 if(m_bAlt) '*|Wi}0R  
  mask|=2; \XD&0inv  
 if(m_bShift) j-ZKEA{:1  
  mask|=1; D^$Nn*i;U  
  key=Key_Table[m_Key.GetCurSel()]; Y&'Bl$`  
 if(bRegistered){ Ns?y) G>:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); dr'#  
  bRegistered=FALSE; ]G#og)z4  
 } .|;`qU o  
 cMask=mask; ]z;%%'gW6  
 cKey=key; tgKmC I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L]I)E` s  
 return bRegistered; |W<wPmW_{+  
} XOAZ  
IxHusB  
  四、小结 dnSjXyjFB  
|MY6vRJ(  
  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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