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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 *n?hN  
  bV@5B#] 2R  
  一、实现方法 *qIns/@  
*nUa0Zg4q6  
  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: jN7Z} 1`  
\WVY@eB  
#pragma data_seg("shareddata") AlgVsE%Va  
HHOOK hHook =NULL; //钩子句柄 VD=F{|^  
UINT nHookCount =0; //挂接的程序数目 xoE,3Sn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0j 'k%R[l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @|~D?&<\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey MP8s}  
static int KeyCount =0; GlXzH1wZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U3c!*i  
#pragma data_seg() (]<G)+*  
SY2((!n._  
  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。 R&}{_1dj8  
sE(mK<{pk  
  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: pC)S9Kl  
j%*<W> O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |:`gjl_Nf  
cKey,UCHAR cMask) RAEiIf!3  
{ vnz}Pr! c  
 BOOL bAdded=FALSE; jCt[I5"+z  
 for(int index=0;index<MAX_KEY;index++){ 9n".Q-V;k  
  if(hCallWnd[index]==0){ ;|K(6)  
   hCallWnd[index]=hWnd; 3+%L[fW`/  
   HotKey[index]=cKey; |G-o&m"  
   HotKeyMask[index]=cMask; 'P-FeN^  
   bAdded=TRUE; :w c.V  
   KeyCount++; s0'Xihsw6  
   break; W3i X;-Z  
  } |fm"{$u  
 } Dr"F5Wbg  
 return bAdded; AyZBH &}RZ  
} ~48mCD  
//删除热键 9DmQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RFm9dHI27  
{ r+Y]S-o:  
 BOOL bRemoved=FALSE; 8,(5Q  
 for(int index=0;index<MAX_KEY;index++){ UBy:W^\g  
  if(hCallWnd[index]==hWnd){ 8c'E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V|dKKb[Lve  
    hCallWnd[index]=NULL; j2{ '!  
    HotKey[index]=0; %OsV(7  
    HotKeyMask[index]=0; BhJ~jV"  
    bRemoved=TRUE; YJrZ  
    KeyCount--; X?.LA7)CK  
    break; E|^~R}z)  
   } 1 Xu^pc  
  } +xtR`Y"  
 } s|&2QG0'7  
 return bRemoved; rB%acTCz=[  
} Q1@V?`rkS{  
Eq/%k $6#1  
G;pxB,4s5  
  DLL中的钩子函数如下: /!0{9F<  
jCbxI^3A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :j,e0#+sA  
{ |"a%S,I'  
 BOOL bProcessed=FALSE; o %tvwv  
 if(HC_ACTION==nCode) $PNIuC?=  
 {  kQm\;[R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 enJE#4Z5&s  
   switch(wParam) qu/59D  
   {  N;\by<snN  
    case VK_MENU: @7';bfsix  
     MaskBits&=~ALTBIT; ojd/%@+u+Y  
     break; R|AG N*.  
    case VK_CONTROL: l*yJU3PW  
     MaskBits&=~CTRLBIT; L$FLQyDR  
     break; r0\cgCn  
    case VK_SHIFT: ~3z10IG  
     MaskBits&=~SHIFTBIT; v ~%6!Tr  
     break; O-vvFl#4  
    default: //judge the key and send message kST  
     break; R:v`\  
   } 1)M>vdrP  
   for(int index=0;index<MAX_KEY;index++){ Ye_)~,{,p  
    if(hCallWnd[index]==NULL) %k3a34P@  
     continue; # 1,(I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a4! AvG  
    { EkqsE$52  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x3my8'h@  
     bProcessed=TRUE; KdOy3O_5N  
    } q-}J0vu\K  
   } hQgi--Msw'  
  } BY$%gIB6>  
  else if((lParam&0xc000ffff)==1){ //有键按下 R('44v5JQp  
   switch(wParam) PTvP;  
   { |nj%G<  
    case VK_MENU: <H~  (iQ  
     MaskBits|=ALTBIT; ZUMzWK5Th  
     break; iffRGnN^e  
    case VK_CONTROL: 4>Q6!"  
     MaskBits|=CTRLBIT; NPEs0|  
     break; .)mw~3]  
    case VK_SHIFT: 9oY%v7  
     MaskBits|=SHIFTBIT; 3&-BO%i  
     break; "Gxf[6B  
    default: //judge the key and send message q$s0zqV5  
     break; gKS0!U  
   } lG;sDR|)(  
   for(int index=0;index<MAX_KEY;index++){ hC8'6h  
    if(hCallWnd[index]==NULL) =2{^qvP  
     continue; nK6{_Y>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C (_xqn  
    { avk0pY(n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W!z=AL{  
     bProcessed=TRUE; f?_H02j`/E  
    } 810u +%fu  
   } t1.5hsp  
  } 0*8[m+j1  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <$HP"f+<S5  
   for(int index=0;index<MAX_KEY;index++){ f|_iHY  
    if(hCallWnd[index]==NULL) Ssr P  
     continue; 6546"sU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;e_n7>'#%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^'C1VQ%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ; eq^m,oz  
   } )}7rM6hv  
  } y#^d8 }+  
 } kL,AY-Iu{@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); SUfl`\O  
} +kQ$X{+;8  
Ah28D!Gor  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ,`MUd0 n  
xO6)lVd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zD-.bHo>.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 50Co/-)j  
=g$%.  
  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: 9#.nNv*z3  
a%sr*`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  -}{c;pT  
{ =x9zy]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e&E""ye  
 { n_hV;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &aaXw?/zr  
  SaveBmp(); ](@Tbm8  
  return FALSE; -D0kp~AO4N  
 } *<zfe.  
 …… //其它处理及默认处理 u:3~Ius  
} zVYX#- nv  
_CBG?  
[L"(flY(E  
  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。 Edc<  8-  
 J O`S  
  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。 :}v&TQ  
 ">*PH}b  
  二、编程步骤 ub6=^`>h  
kc\^xq~  
  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"; [&y{z-D>  
o4,W!^ n2  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kf>oZ*/  
^N _kiSr  
  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; 6+e@)[l.zc  
dmW0SK   
  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; YUat}-S  
ne4hR]:  
  5、 添加代码,编译运行程序。 G@ XKE17  
_K3?0<=4  
三、程序代码 ,n}X,#]  
xg k~y,F  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &[}b HX /  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =U!M,zw4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0$%:zHi5g  
#if _MSC_VER > 1000 dQQh$*IL?{  
#pragma once 6SIk?]u  
#endif // _MSC_VER > 1000 { ,qm=Xjq  
#ifndef __AFXWIN_H__ |vw0:\/ H  
#error include 'stdafx.h' before including this file for PCH Dx/BxqG6}_  
#endif D|@*HX@_Xp  
#include "resource.h" // main symbols G< l+94(  
class CHookApp : public CWinApp Jc"xH~,  
{ 61HU_!A8S  
 public: iF?4G^  
  CHookApp(); $rv&!/}]e  
  // Overrides ;z/Z(7<; ;  
  // ClassWizard generated virtual function overrides |T atRB3>  
  //{{AFX_VIRTUAL(CHookApp) )"q$g&  
 public: B>WAlmPA  
  virtual BOOL InitInstance(); +1~Y2   
  virtual int ExitInstance(); z;JyHC)  
  //}}AFX_VIRTUAL UmcPpZ  
  //{{AFX_MSG(CHookApp) @r^a/]5D  
  // NOTE - the ClassWizard will add and remove member functions here. fgK1+sW  
  // DO NOT EDIT what you see in these blocks of generated code ! +] >o@  
  //}}AFX_MSG Tz[ck 'k  
  DECLARE_MESSAGE_MAP() [QEV6 S]  
}; \wEHYz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c"Ddw'?e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $n\{6Rwb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1%68Pnqk  
BOOL InitHotkey(); c! vtQ<h-  
BOOL UnInit(); tAO,s ZW  
#endif W+d=BnOa8  
SK t&]H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +Kw:z?  
#include "stdafx.h" ?55t0  
#include "hook.h" GKTt!MK  
#include <windowsx.h> 7v3'JG1r-  
#ifdef _DEBUG d(9ZopJrQ  
#define new DEBUG_NEW @&#k['c  
#undef THIS_FILE  L_3Ao'SA  
static char THIS_FILE[] = __FILE__; $L7Z_JD5  
#endif YEH /22  
#define MAX_KEY 100 p'{B|ujj6  
#define CTRLBIT 0x04 o{7wPwQ;*  
#define ALTBIT 0x02 n@xC?D:t*  
#define SHIFTBIT 0x01 Y S/x;  
#pragma data_seg("shareddata") jD1/`g%  
HHOOK hHook =NULL; .\XFhOsa  
UINT nHookCount =0; viB'ul7o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey A?i ~*#wE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `Y>'*4a\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *:S_v.Y3"  
static int KeyCount =0; $p:RnH\H1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift DSjEoWj   
#pragma data_seg() X5@+M!`  
HINSTANCE hins; ovm109fTx  
void VerifyWindow(); V>D8l @  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) dt&m YSZ}  
//{{AFX_MSG_MAP(CHookApp) (7Su{tq  
// NOTE - the ClassWizard will add and remove mapping macros here. P/i{_r  
// DO NOT EDIT what you see in these blocks of generated code! ~(i#A>   
//}}AFX_MSG_MAP >-U'mkIH  
END_MESSAGE_MAP() }huj%Pnk )  
3-x ;_  
CHookApp::CHookApp() B' }h6ZH  
{ 9U~fc U6  
 // TODO: add construction code here,  ac  
 // Place all significant initialization in InitInstance 8J|2b; Vf  
} O|%03q(  
|H-%F?<{  
CHookApp theApp; a',6WugIP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OlRtVp1  
{ Z p8\n:  
 BOOL bProcessed=FALSE; y7pwYRY  
 if(HC_ACTION==nCode) Z~R7 G  
 { ]R%[cr  
  if((lParam&0xc0000000)==0xc0000000){// Key up s0r::yO  
   switch(wParam) Ckd j|  
   { \Lu aI  
    case VK_MENU: ^m0nInH  
     MaskBits&=~ALTBIT; \f~m6j$D_  
     break; 3dO~Na`S  
    case VK_CONTROL: uoJ@Jt'j  
     MaskBits&=~CTRLBIT; [B~*88T  
     break; de7 \~$  
    case VK_SHIFT: &/dYJv$[9  
     MaskBits&=~SHIFTBIT; mok94XuK)  
     break; o3b=)E  
    default: //judge the key and send message X1DE   
     break; /q1k)4?E  
   } YV%y KD  
   for(int index=0;index<MAX_KEY;index++){ eX`wQoV%  
    if(hCallWnd[index]==NULL) }2xgm9j<  
     continue; ?D>%+rK8c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `JQw]\f4>  
    { >EE}P|=-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M./1.k&@  
     bProcessed=TRUE; p1F{ v^  
    } y{>T['"@  
   } S\76`Ot  
  } u~rPqBT{d3  
  else if((lParam&0xc000ffff)==1){ //Key down <JUumrEo  
   switch(wParam) c,>y1%V*S{  
   { "L4ZE4|)  
    case VK_MENU: %CoO-1@C  
     MaskBits|=ALTBIT; ^8.s"4{  
     break; J497 >w[  
    case VK_CONTROL: hMCf| e.UY  
     MaskBits|=CTRLBIT; #W$6[#7=I  
     break; tt&#4Z  
    case VK_SHIFT: `d c&B  
     MaskBits|=SHIFTBIT; /,d]`N!  
     break; c T21  
    default: //judge the key and send message f;D(X/"f]  
     break; @\U;?N~k  
   } a``/x_EZMn  
   for(int index=0;index<MAX_KEY;index++) 5J-slNNCQ  
   { |@W|nbAfX  
    if(hCallWnd[index]==NULL) SA{noM  
     continue; :|\[a0ZL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QXI#gA  =  
    { q}P UwN6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mX/'Fta  
     bProcessed=TRUE; 0g8ykGyx  
    } \B4f5 L8k  
   } _ <Ip0?N  
  } U| T}0  
  if(!bProcessed){ k1'd';gQ  
   for(int index=0;index<MAX_KEY;index++){ wY]ejK$0R  
    if(hCallWnd[index]==NULL) `\beQ(g  
     continue; bblEZ%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t5CJG'!ql  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .Te GA;  
   } Skl:~'W.&|  
  } 5X PoQ^  
 } 5Lm-KohT'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;.66phe  
} dvE~EZcS  
aH7@:=B  
BOOL InitHotkey() G>edJPfQ  
{ QsX`IYk  
 if(hHook!=NULL){ M1z ?E@kz  
  nHookCount++; :FUxe kz  
  return TRUE; Qo/pz2N  
 } .PD_Vv>C/>  
 else B.A;1VE5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qP[_!C.  
  if(hHook!=NULL) I)\{?LdHR  
   nHookCount++; v}5||s!=  
  return (hHook!=NULL); 18^K!:Of  
} wG&Z7C b  
BOOL UnInit() |w"G4J6ha  
{ =}" P;4:  
 if(nHookCount>1){ a8YFH$Xh  
  nHookCount--; !a4`SjOgu  
  return TRUE; ')T*cLQ><  
 } ]`q]\EH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); y*Gq VA[  
 if(unhooked==TRUE){ ^V~^[Yp  
  nHookCount=0; R5 i xG9  
  hHook=NULL; d};[^q6X  
 } 9ec>#Vxx  
 return unhooked; z57q |  
} $a|>>?8  
)EK\3q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S c ijf 9  
{ gj7'4 3 ?W  
 BOOL bAdded=FALSE; VtzBYza  
 for(int index=0;index<MAX_KEY;index++){ tl 9`  
  if(hCallWnd[index]==0){ Jt:)(&-t   
   hCallWnd[index]=hWnd; } rX)A\ g6  
   HotKey[index]=cKey; (&=3Y8  
   HotKeyMask[index]=cMask; 4Wu(Tps  
   bAdded=TRUE; DoNN;^H  
   KeyCount++; HJ!!"  
   break; 2eRv{_  
  } ?pdN!zOeL  
 } bZ#KfR  
 return bAdded; th{ie2$  
} E9w"?_A)  
IrIW>r} -  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l*Q OM  
{ V`0Y p  
 BOOL bRemoved=FALSE; iA|n\a~ny,  
 for(int index=0;index<MAX_KEY;index++){ hh$i1n  
  if(hCallWnd[index]==hWnd){ 4}Y? :R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?Ld:HE  
    hCallWnd[index]=NULL; >[N6_*K]  
    HotKey[index]=0; _PLZ_c:O  
    HotKeyMask[index]=0; e< G[!m  
    bRemoved=TRUE; J|@O4 g   
    KeyCount--; )h]tKYx  
    break; f[*g8p  
   } vl!o^_70(  
  } \'X-><1  
 } sHPlNwyy  
 return bRemoved; "^ aSONz  
} 5k c?:U&  
p m<K6I  
void VerifyWindow() _ t.E_K  
{ ^U^K\rq 1u  
 for(int i=0;i<MAX_KEY;i++){ 3*F|`js"  
  if(hCallWnd!=NULL){ K<k\A@rv8H  
   if(!IsWindow(hCallWnd)){ ~iIFe+6  
    hCallWnd=NULL; K#N5S]2yb  
    HotKey=0; ZftucD|ZY/  
    HotKeyMask=0; 8/}S/$  
    KeyCount--; Y3ypca&P9  
   } J! "m{ 8-  
  } ;xSlRTNT=6  
 } ug/P>0  
} Ko!a`I2M}  
]E*xn  
BOOL CHookApp::InitInstance() 6J965eM'[  
{ bv``PSb3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A&d_! u>  
 hins=AfxGetInstanceHandle(); BA9;=orx  
 InitHotkey(); CHdYY7\{  
 return CWinApp::InitInstance(); ;p"#ZS7  
} <^+&A7 Q-_  
V oyRB2t  
int CHookApp::ExitInstance() M2A3]wd2a  
{ oMxpdG3y-  
 VerifyWindow(); S,s") )A1  
 UnInit(); (9)uZ-BF,  
 return CWinApp::ExitInstance(); [C3wjYi  
} U9Lo0K  
tbB.n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^J@ Xsl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;?gR,AKZ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ G[ q<P  
#if _MSC_VER > 1000 '<wZe.Q!  
#pragma once kqCUr|M.P  
#endif // _MSC_VER > 1000 m.U&O=]5  
V^\b"1X7N  
class CCaptureDlg : public CDialog ?aZ\D g{  
{ <2\Q Y  
 // Construction d 8z9_C-  
 public: L @8[.  
  BOOL bTray; c- [IgX e  
  BOOL bRegistered; WWA!_  
  BOOL RegisterHotkey(); )IuwI#pm  
  UCHAR cKey; Lf,C5 0  
  UCHAR cMask; 3UcOpq2i\  
  void DeleteIcon(); UvGX+M,z'  
  void AddIcon(); CasFj9,  
  UINT nCount; } d7o-  
  void SaveBmp(); 2yV {y#\   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor VjSA& R  
  // Dialog Data s3)T}52  
  //{{AFX_DATA(CCaptureDlg) >kV=h?]Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; P1ynCe  
  CComboBox m_Key; w.Kp[  
  BOOL m_bControl; w'Jo).OW~  
  BOOL m_bAlt; 6o GF6C  
  BOOL m_bShift; g1q%b%8T  
  CString m_Path; rgu7g  
  CString m_Number; M,eq-MEK  
  //}}AFX_DATA s`L>mRw`  
  // ClassWizard generated virtual function overrides c`V~?]I>  
  //{{AFX_VIRTUAL(CCaptureDlg) M'xG.'  
 public: Lw{'mtm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); HTP~5J  
 protected: t<qXXQ&5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CHM+@lD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); GV SVNT}I  
  //}}AFX_VIRTUAL Y;8.(0r/  
  // Implementation BeM|1pe.  
 protected: !7uFH PK-  
  HICON m_hIcon; h{Y#. j~aS  
  // Generated message map functions oSoU9_W  
  //{{AFX_MSG(CCaptureDlg) /7b$C]@k  
  virtual BOOL OnInitDialog(); 3q1u9`4;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V7>{,  
  afx_msg void OnPaint(); <V*M%YWs  
  afx_msg HCURSOR OnQueryDragIcon(); ;<v9i#K5  
  virtual void OnCancel(); oFS)3.  
  afx_msg void OnAbout(); .w~zW*M0  
  afx_msg void OnBrowse(); ,:3Di (  
  afx_msg void OnChange(); v&u8Ks  
 //}}AFX_MSG =A^VzIj(  
 DECLARE_MESSAGE_MAP() Y.8mgy>   
}; mr`EcO0  
#endif gx6$:j;   
?;Ge/~QU5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b%I2ig  
#include "stdafx.h" .sbV<ulbc  
#include "Capture.h" M{~KT3c  
#include "CaptureDlg.h" 4N{^niq7  
#include <windowsx.h> b~m|mb$  
#pragma comment(lib,"hook.lib") %-[U;pJe;  
#ifdef _DEBUG AY%Y,< a  
#define new DEBUG_NEW Og<UW^VR  
#undef THIS_FILE YS&Q4nv-  
static char THIS_FILE[] = __FILE__; ^1+&)6s7V  
#endif wz 5*?[4  
#define IDM_SHELL WM_USER+1 t>%J3S>'ZV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (B;rjpK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V|bN<BYJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MQGR-WV=5  
class CAboutDlg : public CDialog mkt%|Kb.  
{ /bv4/P  
 public: {AqPQeNgz  
  CAboutDlg(); "4qv yVOE  
  // Dialog Data 6}e"$Ee}9  
  //{{AFX_DATA(CAboutDlg) m-!Uy$yM  
  enum { IDD = IDD_ABOUTBOX }; @C6.~OiP  
  //}}AFX_DATA :w 4Sba3  
  // ClassWizard generated virtual function overrides NX:i]t  
  //{{AFX_VIRTUAL(CAboutDlg) 2M+'9 +k~  
 protected: k M' :.QT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E:ocx2dp  
  //}}AFX_VIRTUAL = eDi8A*~  
  // Implementation ]Syr{|  
 protected: AIFI@#3  
  //{{AFX_MSG(CAboutDlg) 6'qC *r   
  //}}AFX_MSG m%km@G$  
  DECLARE_MESSAGE_MAP() TwXqk>J  
}; uVw|fT  
-?68%[4lm_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -.X-02  
{ <Xr {1M D  
 //{{AFX_DATA_INIT(CAboutDlg) J.QFrIB{]+  
 //}}AFX_DATA_INIT DJf!{:b)  
} `V[{,!l;X  
r .b!3CoQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \`M8Mu9~w  
{ _}-Ed,.=  
 CDialog::DoDataExchange(pDX); !z]2+  
 //{{AFX_DATA_MAP(CAboutDlg) J M,ndl  
 //}}AFX_DATA_MAP ?ydqmj2[F  
} m|w-}s,  
>HY( Ij<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^5 sO;vf  
 //{{AFX_MSG_MAP(CAboutDlg) v5;V$EGD&  
 // No message handlers G>);8T%l  
 //}}AFX_MSG_MAP K`?",G?_  
END_MESSAGE_MAP() Q-}yZ  
{"uLV{d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q5H! ^RQm  
: CDialog(CCaptureDlg::IDD, pParent)  iFy_ D  
{ /!mF,oR!  
 //{{AFX_DATA_INIT(CCaptureDlg) CQx#Xp>=s  
  m_bControl = FALSE; >3a<#s{%  
  m_bAlt = FALSE; (}u2) 9  
  m_bShift = FALSE; ]l WEdf+  
  m_Path = _T("c:\\"); _c 4kj  
  m_Number = _T("0 picture captured."); 93*MY7j}  
  nCount=0; (/r l\I  
  bRegistered=FALSE; 9zKrFqhNo  
  bTray=FALSE; r2]KP(T8|  
 //}}AFX_DATA_INIT  ]%L?b-e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `i,l)X]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *Jy'3o  
} ZYy?JDAO  
|aovZ/b4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) :Ej#qYi  
{ W5^m[,GU'  
 CDialog::DoDataExchange(pDX); w+NdEE4H9z  
 //{{AFX_DATA_MAP(CCaptureDlg) MM*B.y~TxZ  
  DDX_Control(pDX, IDC_KEY, m_Key); .A. VOf_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "[rChso  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Hq*\,`b&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); uwcm%N;I"  
  DDX_Text(pDX, IDC_PATH, m_Path); Gb\Nqx(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8AK=FX&@&  
 //}}AFX_DATA_MAP 0Y81B;/F  
} }9GD'N?4  
|ZAR!u&0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j[Y$)HF  
//{{AFX_MSG_MAP(CCaptureDlg) WDC+Jmlgp  
 ON_WM_SYSCOMMAND() a$*)d($  
 ON_WM_PAINT() oXef<- :  
 ON_WM_QUERYDRAGICON() Qt@_C*,P  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +y$%S4>0tp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;p !|E3o.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0'IV"eH2  
//}}AFX_MSG_MAP (|EnRk-E  
END_MESSAGE_MAP() ]{Ytf'bG  
4Y)rgLFj  
BOOL CCaptureDlg::OnInitDialog() *,:>EcDr  
{ y\Z$8'E5W  
 CDialog::OnInitDialog(); 5*ip}wA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G>/Gw90E  
 ASSERT(IDM_ABOUTBOX < 0xF000); -.>b7ui  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Nm.H  
 if (pSysMenu != NULL) K\7\  
 { [<+A?M=  
  CString strAboutMenu; 'edd6yTd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); RpAqnDX)  
  if (!strAboutMenu.IsEmpty()) L|wD2iw  
  { -_bnGY%,  
   pSysMenu->AppendMenu(MF_SEPARATOR); *f[nge&.  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G^`IfF-j  
  } sw={bUr6G`  
 } Li jisE  
 SetIcon(m_hIcon, TRUE); // Set big icon QgZwU$`p0  
 SetIcon(m_hIcon, FALSE); // Set small icon o"te7nBI  
 m_Key.SetCurSel(0); hmRnr=2N  
 RegisterHotkey(); =ZE]jmD4P  
 CMenu* pMenu=GetSystemMenu(FALSE); Df\~ ZWs!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v-k~Q$7~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); PgeC\#;9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -K 7jigac  
 return TRUE; // return TRUE unless you set the focus to a control b'!t\m  
} J4yL"iMt  
\>T+\?M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [z2XK4\e1T  
{ bjQp6!TsZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u?(@hUV.  
 { TY(B]Q_o  
  CAboutDlg dlgAbout; raWs6b4Q  
  dlgAbout.DoModal(); 66P'87G  
 } #y<KO`Es  
 else iYqZBLf{S  
 {  kYls jM  
  CDialog::OnSysCommand(nID, lParam); 0pO{{F  
 } T<hS  
} s$cr|p;7#  
'MM%Sm,  
void CCaptureDlg::OnPaint() 81gcM?  
{ 6zo'w Wc3  
 if (IsIconic()) *>lh2ssl L  
 { \~sc6ho  
  CPaintDC dc(this); // device context for painting |[/<[@\''  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); DChqcdx~~  
  // Center icon in client rectangle {XHAQ9'  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7# ~v<M6  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0rt@4"~~w  
  CRect rect; 7$;#-l  
  GetClientRect(&rect); y$ L@!r/s  
  int x = (rect.Width() - cxIcon + 1) / 2; k<.$7Pl3U  
  int y = (rect.Height() - cyIcon + 1) / 2; S}O>@ %  
  // Draw the icon [~3[Tu( C  
  dc.DrawIcon(x, y, m_hIcon); Fgx{ s%&-  
 } !cLdoX  
 else #.<Uy."z2  
 { ~  4v  
  CDialog::OnPaint(); WpPm|h  
 } 4LEWOWF}  
} r8.`W\SKX  
($Cy-p  
HCURSOR CCaptureDlg::OnQueryDragIcon() #%4XZ3j#j;  
{ "!V-@F$@N  
 return (HCURSOR) m_hIcon; 9H~2 iW,Q;  
} jGg,)~)Y  
wzXIEWJ  
void CCaptureDlg::OnCancel() ?QDHEC62  
{ L}~"R/iWCT  
 if(bTray) v qt#JdPp9  
  DeleteIcon(); 'n:|D7t  
  CDialog::OnCancel(); Vu0d\l^$  
} (yx^zW7  
S!Alno  
void CCaptureDlg::OnAbout() q9e(YX>  
{ X#ZQpo'h  
 CAboutDlg dlg; `"(FWK=8)"  
 dlg.DoModal(); j*.K|77WHj  
} \;!}z3Ww  
J?wCqA  
void CCaptureDlg::OnBrowse() h23"<  
{ Fy; sVB  
 CString str; ,Y:ET1:  
 BROWSEINFO bi; fY4I(~Q  
 char name[MAX_PATH]; ~ u)} /  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W)_|jpd[  
 bi.hwndOwner=GetSafeHwnd(); Bj=lUn`T:  
 bi.pszDisplayName=name; = 9Ow!(!@  
 bi.lpszTitle="Select folder"; x|b52<dLL&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Udi  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8l1s]K qr  
 if(idl==NULL) NmuzAZr  
  return; |rgp(;iO  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3s]aXz:  
 str.ReleaseBuffer(); <2n5|.:>  
 m_Path=str; vGCvJ*4!  
 if(str.GetAt(str.GetLength()-1)!='\\') 0P 5s'2w  
  m_Path+="\\";  )>=!</@  
 UpdateData(FALSE); oimM)Yo  
} F@tfbDO?  
_xefFy  
void CCaptureDlg::SaveBmp() 'mELW)S  
{ khc1<BBsT  
 CDC dc; n5DS  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fN_qJm#:$y  
 CBitmap bm; P=[_W;->}  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7es<%H  
 int Height=GetSystemMetrics(SM_CYSCREEN); Sx0/Dm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hCOCX_  
 CDC tdc; i V$TvD+  
 tdc.CreateCompatibleDC(&dc); `j1b5&N;7  
 CBitmap*pOld=tdc.SelectObject(&bm); [n2+`A  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~Ydm"G  
 tdc.SelectObject(pOld); f:K>o .  
 BITMAP btm; mo?*nO|-  
 bm.GetBitmap(&btm); Ki\\yK  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j|KjQ'9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 03/mB2|TF(  
 BITMAPINFOHEADER bih; KB"N',kG  
 bih.biBitCount=btm.bmBitsPixel; 9Q.@RO$%C  
 bih.biClrImportant=0; ;*G';VuT  
 bih.biClrUsed=0; ;/h&40&  
 bih.biCompression=0; &RHZ7T  
 bih.biHeight=btm.bmHeight; '8yCwk  
 bih.biPlanes=1; 9+iz+  
 bih.biSize=sizeof(BITMAPINFOHEADER); .6=;{h4cpB  
 bih.biSizeImage=size; i91 =h   
 bih.biWidth=btm.bmWidth; &7 K=  
 bih.biXPelsPerMeter=0; Vb8Qh601  
 bih.biYPelsPerMeter=0; q'Nafa&a)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E !9(6G4  
 static int filecount=0; )H>?K0I  
 CString name; Kqz+:E8D  
 name.Format("pict%04d.bmp",filecount++); @<jm+f"MP  
 name=m_Path+name; j"A<qI  
 BITMAPFILEHEADER bfh; rJT YCe1*  
 bfh.bfReserved1=bfh.bfReserved2=0; `-!kqJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GBl[s,g[|  
 bfh.bfSize=54+size; :jf/$]p  
 bfh.bfOffBits=54; q@^^jlHP  
 CFile bf; L)n_  Q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ | .gE9'"bv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ``-pjD(t  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \ iA'^69  
  bf.WriteHuge(lpData,size); jL7r1pu5  
  bf.Close(); D#D55X^6*  
  nCount++; &P,uK+C4  
 } ' Tk4P{  
 GlobalFreePtr(lpData); l>?f+70  
 if(nCount==1) HUChg{[  
  m_Number.Format("%d picture captured.",nCount); <L('RgA@X  
 else ' GUCXx  
  m_Number.Format("%d pictures captured.",nCount); :Xs4C%H;  
  UpdateData(FALSE); 4wN5x[vp  
} AtUtE#K  
#N$\d4q9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m^~5Xr"  
{ @uz(h'~  
 if(pMsg -> message == WM_KEYDOWN) s f.z(o  
 { MH|F<$42  
  if(pMsg -> wParam == VK_ESCAPE) O#k eoC4  
   return TRUE; O ^!Bc}$  
  if(pMsg -> wParam == VK_RETURN) (hBph+  
   return TRUE; o`Af6C;Q  
 } Qo!F?i/ n  
 return CDialog::PreTranslateMessage(pMsg); w~q ]&  
} H#u N&^+H  
W ' ~s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D59q/@  
{ UpPl-jeT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ZWni5uF-c  
  SaveBmp(); dC;&X g`  
  return FALSE; ts% n tnvI  
} &Dt=[yqeG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m] yUcj{F  
 CMenu pop;  .^2.h  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ZXN`8!]&  
 CMenu*pMenu=pop.GetSubMenu(0); `-e9#diQe  
 pMenu->SetDefaultItem(ID_EXITICON); ^s#+`Y05/  
 CPoint pt; BNF*1JO  
 GetCursorPos(&pt); 6oq5CDoq  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gj iFpW4  
 if(id==ID_EXITICON) ACy}w?D<  
  DeleteIcon(); >9mj/P D  
 else if(id==ID_EXIT) mK/E1a)AG3  
  OnCancel(); ?lfyC/  
 return FALSE;  iDx(qdla  
} pN)x,<M)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <CB%e!~.9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &Nh zEl1  
 AddIcon(); k ~Q 5Cs  
 return res; '7}2}KD  
} 5rfDm  
J[05T1  
void CCaptureDlg::AddIcon() -L4G)%L\  
{ HI{h>g T  
 NOTIFYICONDATA data; ~]#-S20  
 data.cbSize=sizeof(NOTIFYICONDATA); <Y6zJ#BD  
 CString tip; `K:n=hpF  
 tip.LoadString(IDS_ICONTIP); eEfGH  
 data.hIcon=GetIcon(0); tSux5 yV  
 data.hWnd=GetSafeHwnd(); ]l C2YD}  
 strcpy(data.szTip,tip); V']Z_$_  
 data.uCallbackMessage=IDM_SHELL; 'sXrtl7{^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; U?d  I  
 data.uID=98; _VRxI4q  
 Shell_NotifyIcon(NIM_ADD,&data); *N4/M%1P  
 ShowWindow(SW_HIDE); UmvnVmnv  
 bTray=TRUE; J<0d"'  
} )HC/J-  
ll1N`ke  
void CCaptureDlg::DeleteIcon() b !y  
{ z5oJQPPi  
 NOTIFYICONDATA data; \NMqlxp2  
 data.cbSize=sizeof(NOTIFYICONDATA); 0%< hj  
 data.hWnd=GetSafeHwnd(); 9-V'U\}L  
 data.uID=98; /t`,7y 3T  
 Shell_NotifyIcon(NIM_DELETE,&data); +ue1+#  
 ShowWindow(SW_SHOW); ',xUU{5?  
 SetForegroundWindow(); .>#O'Z&q9  
 ShowWindow(SW_SHOWNORMAL); g Oe!GnO  
 bTray=FALSE; KO7&dM  
} N*hV/"joZ  
7G^Q2w  
void CCaptureDlg::OnChange() *r[V[9+y-D  
{ kX+9U"` C  
 RegisterHotkey(); :*&c'  
} `"[qb ?z  
,`RX~ H=C  
BOOL CCaptureDlg::RegisterHotkey() VBix8|  
{ #R:&Irh  
 UpdateData(); S5u$I  
 UCHAR mask=0; cfilH"EK  
 UCHAR key=0; XVqkw@Ia4!  
 if(m_bControl) @8>bp#x/1  
  mask|=4; _k26(rdI@-  
 if(m_bAlt) .D ^~!A  
  mask|=2; =R' O5J  
 if(m_bShift) n42\ty9  
  mask|=1; _tX=xAO9  
  key=Key_Table[m_Key.GetCurSel()]; Y2XxfZ j  
 if(bRegistered){ ~-6_-Y|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); q4Wr$T$gs=  
  bRegistered=FALSE; M_Ag *?2I  
 } WA,D=)GP  
 cMask=mask; gSw4\R  
 cKey=key; vG'#5%,|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8Th,C{  
 return bRegistered; O1c:X7lHc  
} HV)aVkr/&  
&z1U0uk  
  四、小结 pZlsDM/=  
,pI9=e@O/z  
  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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