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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: ][`%vj9r  
  X}B ]0z>  
  一、实现方法 AH?4F"  
<d~si^*\ch  
  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: {fa3"k_ke  
52t6_!y+V  
#pragma data_seg("shareddata") cV:Ak~PKl  
HHOOK hHook =NULL; //钩子句柄 e-*-91D  
UINT nHookCount =0; //挂接的程序数目 l;i /$Yu7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T( fcE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fi  [4F  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey OxqkpK&  
static int KeyCount =0; odWK\e  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KZ@'NnQ  
#pragma data_seg() XeX` h_  
A\<W x/  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 8p_6RvG  
pv]" 2'aQ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ]i\;#pj}  
bX>R9i$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '9!J' [W  
cKey,UCHAR cMask) L}6!D zl  
{ g cb6*@u!  
 BOOL bAdded=FALSE; X}H?*'-  
 for(int index=0;index<MAX_KEY;index++){ U1O8u-X  
  if(hCallWnd[index]==0){ +`tk LvM  
   hCallWnd[index]=hWnd; LkXho>y  
   HotKey[index]=cKey; sO{TGk]*  
   HotKeyMask[index]=cMask; |#yH,f  
   bAdded=TRUE; 5bBCI\&sam  
   KeyCount++; 1>Q4&1Vn  
   break; psUT2  
  } J4u>77I  
 } 9}5o> iR  
 return bAdded; |-L7qZu%  
} 3S" /l  
//删除热键 gloJ;dE B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /36gf  
{ -iL:D<!Cb_  
 BOOL bRemoved=FALSE; ;GIA`=a %  
 for(int index=0;index<MAX_KEY;index++){ OX%#8Lx  
  if(hCallWnd[index]==hWnd){ W/g_XQ   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2M=h:::W  
    hCallWnd[index]=NULL; 4AMe>s  
    HotKey[index]=0; sNM ]bei  
    HotKeyMask[index]=0; D -d  
    bRemoved=TRUE; zwz_K!229  
    KeyCount--; hfw+n<  
    break; `]^W#6l  
   } *2pf> UzL  
  } @JGFG+J}  
 } sC0u4w>Y  
 return bRemoved; `][vaLd`Q  
} I]hjv  
Wf^ sl  
*V4%&&{  
  DLL中的钩子函数如下: @yo6w}3+-  
==Xy'n9'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '~ H`Ffd.  
{ h8X[*Wme  
 BOOL bProcessed=FALSE; at4JLbk  
 if(HC_ACTION==nCode) *@p"  
 { ~(8fUob  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 HNCu:$Wr@  
   switch(wParam) ="v`W'Pd  
   {  8|^&~Rl4  
    case VK_MENU: 3n)$\aBE  
     MaskBits&=~ALTBIT; |'z24 :8  
     break; l i)6^f#  
    case VK_CONTROL: 1Iy1xiP  
     MaskBits&=~CTRLBIT; IT{c:jo1{`  
     break; [N Afy~X*  
    case VK_SHIFT: ^2);*X>  
     MaskBits&=~SHIFTBIT; v bn=ywz  
     break; n}_}#(a  
    default: //judge the key and send message tH4 q*\U  
     break; DxwR&S{  
   } n~]"sTC}&  
   for(int index=0;index<MAX_KEY;index++){ =yz"xWH  
    if(hCallWnd[index]==NULL) KE ?NQMU  
     continue; yQMwt|C4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sOlnc6  
    { +<.o,3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r{^43g?  
     bProcessed=TRUE; >~nr,V.q  
    } ^8_yJ=~V  
   } Ln2FG4{  
  } / Ws>;0  
  else if((lParam&0xc000ffff)==1){ //有键按下 z=) m6\  
   switch(wParam) /'aqQ K<  
   { '~Cn+xf4]  
    case VK_MENU: cM3B5Lp  
     MaskBits|=ALTBIT; M:GpyE%  
     break; f)j*P<V  
    case VK_CONTROL: )~)l^0X  
     MaskBits|=CTRLBIT; Y(bB7tR  
     break; RrvC}9ar  
    case VK_SHIFT: ""jW'%wR  
     MaskBits|=SHIFTBIT; [#mk TY  
     break; @;`'s  
    default: //judge the key and send message 8T9 s:/%  
     break; JJ7A` ;  
   } x<M::")5!V  
   for(int index=0;index<MAX_KEY;index++){ 9D+k71"+  
    if(hCallWnd[index]==NULL) OcO/wA(&{  
     continue; 4pf@.ra,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]sqLGmUL  
    { #55:qc>m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D\&S {  
     bProcessed=TRUE; xws{"m,NX~  
    } %L*EB;nK  
   } !e$ZOYe  
  } MGsQF#6]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 'z5jnI  
   for(int index=0;index<MAX_KEY;index++){ } LS8q  
    if(hCallWnd[index]==NULL) :>{!%-1Z  
     continue; NGSts\D'}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ~q}L13^k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q+\<%$:u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0|Fx Sc  
   } HTT&T9]  
  } fV|uKs(W  
 } 88v8lt;R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2P^|juc)sU  
} [oV M9 Q  
wK-VA$;:  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: UgGa]b[9A  
XLt/$Caf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ih".y3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @@H_3!B%4v  
0fXMY-$I  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: p?y2j  
W+!UVUpW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |T""v_q  
{ q7Hf7^a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t<Yi!6  
 { ;yomaAr  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hJ{u!:4  
  SaveBmp(); Fn@`Bi?#q  
  return FALSE; cZxY,UvYa  
 } y<Q"]H.CkQ  
 …… //其它处理及默认处理 9KU&M"Yq&i  
} >;I8w(  
-p_5T*R  
:,0(aB  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 <3{MS],<<  
?"9h-g3`x}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 !{.CGpS ]  
[ @eA o>  
  二、编程步骤 ,XO@ZBOM  
xUdGSr50  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; `xBoNQai  
;bB#P g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; SUUNC06V  
+Umsr  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; !#)t<9]fv  
k)n b<JW|r  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; h+1|.d  
RJWO h  
  5、 添加代码,编译运行程序。 cb9-~*1  
+-<G(^  
三、程序代码 M(I%y0  
v@Uk% O/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL o%?)};o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) UN.;w3`Oc  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LIcc0w3  
#if _MSC_VER > 1000 vdq=F|&  
#pragma once AabQ)23R2  
#endif // _MSC_VER > 1000 X,v.1#[  
#ifndef __AFXWIN_H__ dxs5woP  
#error include 'stdafx.h' before including this file for PCH H[~ D]RG}'  
#endif d%8n   
#include "resource.h" // main symbols ynIC (t  
class CHookApp : public CWinApp 44ty,M3  
{ `yv?PlKL  
 public: oPmz$]_Z  
  CHookApp(); 2&4nf/sE  
  // Overrides 1VgGF^cYR  
  // ClassWizard generated virtual function overrides +\T8`iCFB  
  //{{AFX_VIRTUAL(CHookApp) 3<^Up1CaZ  
 public: xQFY/Z  
  virtual BOOL InitInstance(); f]/2uUsg %  
  virtual int ExitInstance(); f7_( C0d  
  //}}AFX_VIRTUAL s>J5.Z7"'j  
  //{{AFX_MSG(CHookApp) dun`/QKV  
  // NOTE - the ClassWizard will add and remove member functions here. dC({B3#e{  
  // DO NOT EDIT what you see in these blocks of generated code ! qf x*a88  
  //}}AFX_MSG sG u.G  
  DECLARE_MESSAGE_MAP() PGP#$JC  
}; O6G\0o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KHAc!4lA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~!Nj DDk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;g!rc#z2g  
BOOL InitHotkey(); Q-oDmjU  
BOOL UnInit(); '.bf88D  
#endif Gm B&TD m  
,&UKsrs_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. a dqS.xs  
#include "stdafx.h" `7=$I~`  
#include "hook.h" 9w=7A>.U  
#include <windowsx.h> +F)-n2Bi  
#ifdef _DEBUG OE@[a  
#define new DEBUG_NEW N\PdX$  
#undef THIS_FILE c7XBZ%D  
static char THIS_FILE[] = __FILE__; SI!A?34  
#endif 9A"s7iJ)  
#define MAX_KEY 100 <<0sv9qw1  
#define CTRLBIT 0x04 `<nxXsLe  
#define ALTBIT 0x02 =%m{|HQ`  
#define SHIFTBIT 0x01 +aOdaNcI  
#pragma data_seg("shareddata") R/oi6EKv  
HHOOK hHook =NULL; wtYgHC}X  
UINT nHookCount =0; tB4mhX|\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~X3g_<b_8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT k' st^1T  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey T [SK>z  
static int KeyCount =0; Jc#D4e1#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift NT+.E[J6  
#pragma data_seg() u!K1K3T6k  
HINSTANCE hins;  ;2C  
void VerifyWindow(); zFjz%:0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W0f^!}f(  
//{{AFX_MSG_MAP(CHookApp) aZb\uMePK  
// NOTE - the ClassWizard will add and remove mapping macros here. ,m{R m0  
// DO NOT EDIT what you see in these blocks of generated code! D./{f8  
//}}AFX_MSG_MAP / dJz?0  
END_MESSAGE_MAP() ?y? 9;;  
<L]Gk]k_R  
CHookApp::CHookApp() 8._uwA<[  
{ {'M<dI$  
 // TODO: add construction code here, bA)nWWSg=  
 // Place all significant initialization in InitInstance VO0:4{-  
} dx@dnWRT,  
;z4J)qw  
CHookApp theApp; bo|THS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =Ydrct  
{ yP{ 52%|+  
 BOOL bProcessed=FALSE; r]!#v{#.  
 if(HC_ACTION==nCode) &x1A {j_  
 { xq((]5Py  
  if((lParam&0xc0000000)==0xc0000000){// Key up xqX3uq  
   switch(wParam) iE''>Z  
   { -~]H5er`  
    case VK_MENU: "s0,9; }  
     MaskBits&=~ALTBIT; DKj iooD  
     break; %C/p+Tg  
    case VK_CONTROL: -yf8  
     MaskBits&=~CTRLBIT; q TJ0}F  
     break; ],weqs  
    case VK_SHIFT: `^[k8Z(  
     MaskBits&=~SHIFTBIT; KVOV<uDCj  
     break; _3aE]\O[  
    default: //judge the key and send message t)&U'^  
     break; .zgh,#=  
   } xS1|t};  
   for(int index=0;index<MAX_KEY;index++){ m+!.H\  
    if(hCallWnd[index]==NULL) 8H4NNj Oy  
     continue; tBGLEeL/.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *<sc[..)  
    { )9nW`d+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b,^ "-r  
     bProcessed=TRUE; D U\ytD`u  
    } Sh(ys*y>  
   } dM;\)jm  
  } wnC} TWxX  
  else if((lParam&0xc000ffff)==1){ //Key down S' $;  
   switch(wParam) 684& H8  
   { hV(^Y)f  
    case VK_MENU: 0;l~B  
     MaskBits|=ALTBIT; D>y5&`  
     break; "<=4]Z  
    case VK_CONTROL: $l*?Ce:  
     MaskBits|=CTRLBIT; >T]9.`xhK  
     break; n$C- ^3 c  
    case VK_SHIFT: HDV-qYD|O~  
     MaskBits|=SHIFTBIT; JH\:9B+:L  
     break; i?!9%U!z4  
    default: //judge the key and send message \(pwHNSafk  
     break; 1Rd|P<y  
   } b\0>uU  
   for(int index=0;index<MAX_KEY;index++) NWn*_@7;  
   { R:f!ywj%  
    if(hCallWnd[index]==NULL) le \f:  
     continue; #HgN wM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )l`Ks  
    { 4,;*sc6*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )>1}I_1j)  
     bProcessed=TRUE; 82@^vX  
    } =;-C;gn:w  
   } _$R=F/88  
  } 4"@;.C""  
  if(!bProcessed){ %w^*7Oi  
   for(int index=0;index<MAX_KEY;index++){ MZ}0.KmaZ  
    if(hCallWnd[index]==NULL) {A==av  
     continue; Cdz?+hb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ei4LE XQ16  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `R2Iw I&  
   } bdWdvd:  
  } X[$h &]  
 } tn$TyCzckW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^5s7mls  
} <5G(Y#s/?  
n5C,Z!)z  
BOOL InitHotkey() MtL<)?HQ  
{ -ZE YzZqY  
 if(hHook!=NULL){  7V5c`:"  
  nHookCount++; MDytA0M  
  return TRUE; oIO@#   
 } s/hgWW$  
 else *KNfPh#wi}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?Ojv<L-f.:  
  if(hHook!=NULL) J\@g3oGw  
   nHookCount++; 9_wDh0b~p  
  return (hHook!=NULL); a_!H_J  
} K W&muD  
BOOL UnInit() WA2NjxYz  
{ *DIY;)K  
 if(nHookCount>1){ 1Z ~C3)T=  
  nHookCount--; s``a{ HZ  
  return TRUE; $B?8\>_?  
 } MUbKlX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |a03S Zx  
 if(unhooked==TRUE){ 3U^Vz9LW  
  nHookCount=0; lF64g  
  hHook=NULL; _'w:Sx?d7  
 } DNZ,rL:h  
 return unhooked; Psf'^42(v  
} :q3w;B~  
"0%K3d+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A5F (-  
{ MJX4;nbl  
 BOOL bAdded=FALSE; kntY2FM  
 for(int index=0;index<MAX_KEY;index++){ yKUxjb^b\  
  if(hCallWnd[index]==0){ )SP"V~^Wn  
   hCallWnd[index]=hWnd; t0fgG/f'  
   HotKey[index]=cKey; ?,7!kTRH  
   HotKeyMask[index]=cMask; > }f!. i  
   bAdded=TRUE; dH5*%  
   KeyCount++; z*.G0DFw  
   break; P9m  
  } Zgh~7Z/  
 } >'Lkn2WI  
 return bAdded; C.ynOo,W  
} } Ifa5Lq)  
}%}$h2:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~q+AAWL  
{ [)}P{y [&  
 BOOL bRemoved=FALSE; 0kCo0{+n  
 for(int index=0;index<MAX_KEY;index++){ B&B4 P  
  if(hCallWnd[index]==hWnd){ 5Q%)|(U'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3pML+Y|ij  
    hCallWnd[index]=NULL; %S"z9@  
    HotKey[index]=0; clyp0`,7  
    HotKeyMask[index]=0; %CnVK1u!  
    bRemoved=TRUE; 8J&9}@y  
    KeyCount--; >{(c\oMD  
    break; i[LnU#+  
   } 3/usgw1  
  } ^W=hs9a+F  
 } rD$5]%Y  
 return bRemoved; `L$Av9X\  
} !XjZt  
m4W (h6  
void VerifyWindow() Uu+ibVM$  
{ jTqJ(M}L  
 for(int i=0;i<MAX_KEY;i++){ h&i(Kfv*  
  if(hCallWnd!=NULL){  Q'cWqr  
   if(!IsWindow(hCallWnd)){ 4J`-&05O  
    hCallWnd=NULL; L-U4 8 i  
    HotKey=0; g qORE/[  
    HotKeyMask=0; f%_$RdU  
    KeyCount--; A #SO}c  
   } fA?Wf[`x  
  } Y ?~n6<  
 } D`Vb3aNB=L  
} 'bZw-t!M@  
"Ltp]nCR  
BOOL CHookApp::InitInstance() cEp/qzAiD%  
{ }Gb^%1%M  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %#4;'\'5  
 hins=AfxGetInstanceHandle(); Vm@VhCsp  
 InitHotkey(); =&-.]| t  
 return CWinApp::InitInstance(); _}\KC+n8  
} t3}_mJ  
sX>|Y3S\U  
int CHookApp::ExitInstance() S]T71W<i  
{ *3RD\.jPX  
 VerifyWindow(); O*/Utl  
 UnInit(); { ~{D(k  
 return CWinApp::ExitInstance(); |1!|SarM{B  
} A ?~4Pe  
V^.Z&7+E`_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file # 6?2 2Os  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >4>. Ycp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )i39'0a  
#if _MSC_VER > 1000 #/`MYh=!W  
#pragma once eon(C|S7eK  
#endif // _MSC_VER > 1000 @$QtY(a  
r!>=G%  
class CCaptureDlg : public CDialog \n#l+R23  
{  q _;#EV  
 // Construction \q-["W34  
 public: )d {8Cu6  
  BOOL bTray; RKs_k`N0  
  BOOL bRegistered; 8fWnKWbbjw  
  BOOL RegisterHotkey(); 'i/"D8  
  UCHAR cKey; C}XB%:5H5  
  UCHAR cMask; 1*@Q~f:Uk  
  void DeleteIcon(); MhFj>t   
  void AddIcon(); ok&v+A  
  UINT nCount; jI}{0LW&F&  
  void SaveBmp(); 9fSX=PVRmQ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E&W4`{6K4  
  // Dialog Data P/9|mYmsq  
  //{{AFX_DATA(CCaptureDlg) 7.^1I7O  
  enum { IDD = IDD_CAPTURE_DIALOG }; "0"8Rp&V|  
  CComboBox m_Key; |TBKsx8  
  BOOL m_bControl; G!ryW4  
  BOOL m_bAlt; zgpv I~Ck  
  BOOL m_bShift; !%C&hH\  
  CString m_Path; @(tiPV  
  CString m_Number; f%d =X>_  
  //}}AFX_DATA o648 xUP  
  // ClassWizard generated virtual function overrides <J1$s_^`  
  //{{AFX_VIRTUAL(CCaptureDlg) U &W}c^#  
 public: oxqD/fY  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .3,Ow(3l  
 protected: 0 .t1p(x;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \?.M1a[  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _UeIzdV9  
  //}}AFX_VIRTUAL 3D7phq>.q  
  // Implementation {5:V hW}  
 protected: ^Ul *Nm  
  HICON m_hIcon; |a Ht6F  
  // Generated message map functions x~O_v  
  //{{AFX_MSG(CCaptureDlg) ~rU{Q>c  
  virtual BOOL OnInitDialog(); fL1EQ)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s%qK<U4@;Q  
  afx_msg void OnPaint(); 5/{gY{  
  afx_msg HCURSOR OnQueryDragIcon(); [R[Suf  
  virtual void OnCancel(); IC7S +v  
  afx_msg void OnAbout(); u>-!5=D8  
  afx_msg void OnBrowse(); ?l<u%o  
  afx_msg void OnChange(); ddD $ 4+  
 //}}AFX_MSG ! =c&U.B  
 DECLARE_MESSAGE_MAP() s*j0uAq)up  
}; wKAc ;!  
#endif \TBY)_[ {  
o93A:fc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FLekyJmw~  
#include "stdafx.h" MoP 0qNk  
#include "Capture.h" A5ps|zidI  
#include "CaptureDlg.h" ~FV Z0%+,  
#include <windowsx.h> \YBY"J  
#pragma comment(lib,"hook.lib") Gv}h/zu-  
#ifdef _DEBUG COK7 i^  
#define new DEBUG_NEW =p)Wxk  
#undef THIS_FILE OC]_b36v  
static char THIS_FILE[] = __FILE__; 8BZDaiE"  
#endif B6b {hsO  
#define IDM_SHELL WM_USER+1 1vQj` F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %h%^i   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WVf>>E^1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5sq#bvfJ o  
class CAboutDlg : public CDialog `?VB)  
{ b&Sk./ J6  
 public: _6 ~/`_(KP  
  CAboutDlg();  3y?ig2  
  // Dialog Data eID"&SSU  
  //{{AFX_DATA(CAboutDlg) toEmIa~o6  
  enum { IDD = IDD_ABOUTBOX }; Hdh'!|w  
  //}}AFX_DATA BS#@ehdig  
  // ClassWizard generated virtual function overrides ET`;TfqM  
  //{{AFX_VIRTUAL(CAboutDlg) h2Z Gh  
 protected: RCq_FY  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;%#@vXH[Oo  
  //}}AFX_VIRTUAL #IP<4"Hf  
  // Implementation mYN|)QVKy  
 protected: $N=A,S  
  //{{AFX_MSG(CAboutDlg) vF;%#P  
  //}}AFX_MSG ,bCPO` 45  
  DECLARE_MESSAGE_MAP() S3Tww]q  
}; h"')D  
UGPD5wX?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) uM0 z%z5b  
{ *IGgbg[0  
 //{{AFX_DATA_INIT(CAboutDlg) b#.hw2?a`  
 //}}AFX_DATA_INIT h?DMrYk_%#  
} l\*}  
L;'+O u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) atFj Vk^  
{ }{S W~yW  
 CDialog::DoDataExchange(pDX); a$FELlMv  
 //{{AFX_DATA_MAP(CAboutDlg) y^:g"|q  
 //}}AFX_DATA_MAP Ne.W-,X^cL  
} fdzD6K ZI  
  ]5'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -rlxxLT+  
 //{{AFX_MSG_MAP(CAboutDlg) !o&Mw:d  
 // No message handlers kN;l@>  
 //}}AFX_MSG_MAP /H,!7!6>?  
END_MESSAGE_MAP() +tOBt("5/  
abCcZ<=|b  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) kkFE9:[-c&  
: CDialog(CCaptureDlg::IDD, pParent) %n9}P , ?  
{ S0g5Ym ia  
 //{{AFX_DATA_INIT(CCaptureDlg) +?(2-RBd  
  m_bControl = FALSE; 7##nY3",^  
  m_bAlt = FALSE; c:51In|~{C  
  m_bShift = FALSE; wr8n*Du  
  m_Path = _T("c:\\"); |z|5j!Nfh  
  m_Number = _T("0 picture captured."); rFn;z}J2  
  nCount=0; o'%F*>#v  
  bRegistered=FALSE; Uz\B^"i|  
  bTray=FALSE; iH( K[F /  
 //}}AFX_DATA_INIT qw0tw2|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +:~&"U^ z&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `t:7&$>T  
} 91%+Bf()J6  
7|T5N[3?l,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Nj.(iBmr  
{ brNe13d3~"  
 CDialog::DoDataExchange(pDX); .?_wcp=  
 //{{AFX_DATA_MAP(CCaptureDlg) |VlAt#E  
  DDX_Control(pDX, IDC_KEY, m_Key); V_~}7~ I  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); vP3Fb;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q]w;o&eo  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); jY:(Tv3~  
  DDX_Text(pDX, IDC_PATH, m_Path); L1Fn;nR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); nPfVZGt  
 //}}AFX_DATA_MAP W]_+3qvZ  
} H<%7aOwO2  
iyu%o9_0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xh @H@Q\  
//{{AFX_MSG_MAP(CCaptureDlg) doP4N6   
 ON_WM_SYSCOMMAND() A! <R?  
 ON_WM_PAINT() eOD;@4lR  
 ON_WM_QUERYDRAGICON() _xAdvr' W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) lV`y6{o#T  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1b;Aru~l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0UWLs_k:  
//}}AFX_MSG_MAP 0FjSa\ZH  
END_MESSAGE_MAP() w^p 'D{{  
11X-X  
BOOL CCaptureDlg::OnInitDialog() E^1uZI\z  
{ ?_m;~>C  
 CDialog::OnInitDialog(); ;{q7rsE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f&8&UL>e`  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4'Vuhqk  
 CMenu* pSysMenu = GetSystemMenu(FALSE); YANg2L>MK  
 if (pSysMenu != NULL) /qo.Z  
 { 5U3="L  
  CString strAboutMenu; 8\. #  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Z?XE~6aP>  
  if (!strAboutMenu.IsEmpty()) \P}~ICZA  
  { e0j*e7$  
   pSysMenu->AppendMenu(MF_SEPARATOR); l K}('7\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eO (VSjo'`  
  } UG&/0{j5XV  
 } G:c)e ,pD  
 SetIcon(m_hIcon, TRUE); // Set big icon zg)Z2?K|;u  
 SetIcon(m_hIcon, FALSE); // Set small icon )3'/g`c  
 m_Key.SetCurSel(0); ?%;7k'0"  
 RegisterHotkey();  Cj_cu  
 CMenu* pMenu=GetSystemMenu(FALSE); Rw^4S@~T  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IA$:r@QNx8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D7[ 8*^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B6MMn.  
 return TRUE; // return TRUE unless you set the focus to a control !j%vUe;t  
} %$`pD I)  
x}AWWmXv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) BNQ~O^R0  
{ P3on4c  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) nI|jUD +y  
 { Iy8Ehwejd  
  CAboutDlg dlgAbout; 8nt:peJ$+  
  dlgAbout.DoModal(); c[3sg  
 } jU@qQ@|  
 else *-3K],^a  
 { hG uRV|`  
  CDialog::OnSysCommand(nID, lParam); zp!{u{  
 } jXSo{  
} i0v;mc  
$FNj>1  
void CCaptureDlg::OnPaint() CS:j->  
{ S'9T>&<Kn  
 if (IsIconic()) ;&s`g   
 { g.SFl  
  CPaintDC dc(this); // device context for painting % E3  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ">v76%>Z7  
  // Center icon in client rectangle k_ UY^vz.  
  int cxIcon = GetSystemMetrics(SM_CXICON); g"`BNI]Qp  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ha[Bf*  
  CRect rect; O B_g:T  
  GetClientRect(&rect); O7g ?x3  
  int x = (rect.Width() - cxIcon + 1) / 2; 0 x4Xs  
  int y = (rect.Height() - cyIcon + 1) / 2; GXr9J rs.e  
  // Draw the icon b" 1a7   
  dc.DrawIcon(x, y, m_hIcon); }cn46 L%/  
 } Ckj2$c~  
 else kl?U 2A.=  
 { ]e$mTRi*  
  CDialog::OnPaint(); sG=D(n1  
 } n!2"pRIi  
} }rj.N98  
.__XOd} K  
HCURSOR CCaptureDlg::OnQueryDragIcon() =3]}87  
{ ({v$!AAv  
 return (HCURSOR) m_hIcon; 1p[C5j3  
} jV2L;APCq  
(0/,R  
void CCaptureDlg::OnCancel() umaF}}-Q{  
{ wN>k&J  
 if(bTray) P"Lk(gY  
  DeleteIcon(); )r3}9J  
  CDialog::OnCancel(); V(I!HT5.W  
} 'r~,~A I  
9^6E> S{=  
void CCaptureDlg::OnAbout() Zyt,D|eWj  
{ 0{^@kxV  
 CAboutDlg dlg; d[E~}Dq3#  
 dlg.DoModal(); xP#vAR  
} }{T9`^V:h  
\UA\0p  
void CCaptureDlg::OnBrowse() Cuu yG8  
{ rH*1bDL  
 CString str; pRWEBd1U  
 BROWSEINFO bi; nGQc;p5;  
 char name[MAX_PATH]; +Ysm6n '  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -AnQZy  
 bi.hwndOwner=GetSafeHwnd(); yHhx- `  
 bi.pszDisplayName=name; p)6!GdT  
 bi.lpszTitle="Select folder"; 'NJGez'b ,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; BIGln`;,f  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G&,1 NjSi  
 if(idl==NULL) [.J&@96,b  
  return; _gU:!:}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EQe!&;   
 str.ReleaseBuffer(); W>f q 9  
 m_Path=str; H#H@AY3Y  
 if(str.GetAt(str.GetLength()-1)!='\\') ~o{GQ>  
  m_Path+="\\"; H<_BnT #  
 UpdateData(FALSE); Y-2IAJHS8  
} S!+c1q: ].  
]oT8H?%*Y  
void CCaptureDlg::SaveBmp() q4u,pm,@  
{ 7 ~b=G  
 CDC dc; jfmHc(fX4  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S]!s)q-- z  
 CBitmap bm; /{1sU}k-  
 int Width=GetSystemMetrics(SM_CXSCREEN); h/oRWl0r  
 int Height=GetSystemMetrics(SM_CYSCREEN); J?6.yL;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Fl0(n #L  
 CDC tdc; rA+UftC:p6  
 tdc.CreateCompatibleDC(&dc); )6+Z99w  
 CBitmap*pOld=tdc.SelectObject(&bm); MzEeDN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); u<L<o 2  
 tdc.SelectObject(pOld); 8y:/!rRN  
 BITMAP btm; :1 *q}R   
 bm.GetBitmap(&btm); _V2^0CZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; iGq%|o>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cI Sugk~  
 BITMAPINFOHEADER bih; 9sP;s^#t7U  
 bih.biBitCount=btm.bmBitsPixel; 5)5$h]Nz>  
 bih.biClrImportant=0; J\@|c.ws  
 bih.biClrUsed=0; m+UWvUB)  
 bih.biCompression=0; ^VC /tJ  
 bih.biHeight=btm.bmHeight; y+\kZIqX  
 bih.biPlanes=1; O2pntKI  
 bih.biSize=sizeof(BITMAPINFOHEADER); l4s*+H$vd?  
 bih.biSizeImage=size; SFu]*II;{  
 bih.biWidth=btm.bmWidth; ,`Keqfx  
 bih.biXPelsPerMeter=0; &Fiesi!tET  
 bih.biYPelsPerMeter=0; _:N=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8Y]% S9.  
 static int filecount=0; ^4b;rLfk@  
 CString name; ) $`}~  
 name.Format("pict%04d.bmp",filecount++); *{_N*p\{  
 name=m_Path+name; mEm=SpO[$o  
 BITMAPFILEHEADER bfh; |}7!'f\M  
 bfh.bfReserved1=bfh.bfReserved2=0; X-=4Z9  
 bfh.bfType=((WORD)('M'<< 8)|'B'); M(^_/ 1Z  
 bfh.bfSize=54+size; hW!2C6  
 bfh.bfOffBits=54; eJ*u]GH U  
 CFile bf; /78zs-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |oWl9j]Z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S$O5jX 0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "MvSF1  
  bf.WriteHuge(lpData,size); _/czH<   
  bf.Close(); kwXUjn p  
  nCount++; 0 <E2^  
 } Z%Pv,h'Q  
 GlobalFreePtr(lpData); CnpQdI  
 if(nCount==1) y>#_LhTX-  
  m_Number.Format("%d picture captured.",nCount); x?UAj8z6  
 else csd9[=HW/Q  
  m_Number.Format("%d pictures captured.",nCount); vM@8&,;  
  UpdateData(FALSE);  0ij YE  
} HUAbq }  
$bDaZGy  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P L7(0b%  
{ cL<,]%SkE  
 if(pMsg -> message == WM_KEYDOWN) i[?VF\Y(  
 { D^QL.Du,  
  if(pMsg -> wParam == VK_ESCAPE) b^STegz  
   return TRUE; C2aA])7 D  
  if(pMsg -> wParam == VK_RETURN) 67;6nXG0K  
   return TRUE; [_KV;qS%/  
 } .VR ~[aD  
 return CDialog::PreTranslateMessage(pMsg); d[{!^,%x"  
} cij8'( "+!  
L PS,\+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y_}_)nE@m  
{ C;5`G *e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -dWg1`;  
  SaveBmp(); v8WT?%  
  return FALSE; l1#.r g  
} fLpWTkr0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,J '_Vi  
 CMenu pop; `rXb:P7m{j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); s q;!5qK  
 CMenu*pMenu=pop.GetSubMenu(0); c^O&A\+;  
 pMenu->SetDefaultItem(ID_EXITICON); >S-JAPuO  
 CPoint pt; )+"5($~  
 GetCursorPos(&pt); &qK:LHhj  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z` YC3_d  
 if(id==ID_EXITICON) W mbIz[un  
  DeleteIcon(); Z)IF3{*  
 else if(id==ID_EXIT) W"*2,R[}%  
  OnCancel(); @)x*62r+  
 return FALSE; S8B?uU  
} MD*dq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); J2 /19'QE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :<s`)  
 AddIcon(); K@JaN/OM  
 return res; ML MetRP  
} {NQCe0S+p  
D)pTE?@W'  
void CCaptureDlg::AddIcon() j>e RV ol  
{ 0{uaSR  
 NOTIFYICONDATA data; 3u/AqL  
 data.cbSize=sizeof(NOTIFYICONDATA); Bu&9J(J1  
 CString tip; Xtfs)"  
 tip.LoadString(IDS_ICONTIP); =-_hq'il  
 data.hIcon=GetIcon(0); 'e*w8h  
 data.hWnd=GetSafeHwnd(); 9gdK&/ulR  
 strcpy(data.szTip,tip); AC'_#nPL#  
 data.uCallbackMessage=IDM_SHELL; -ycdg'v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |`Noj+T47I  
 data.uID=98; 7H?xp_D  
 Shell_NotifyIcon(NIM_ADD,&data); TTFs|T6`q  
 ShowWindow(SW_HIDE); jDqG9]  
 bTray=TRUE; m(?{#aaq  
} "&/2 @  
;9WUt,R  
void CCaptureDlg::DeleteIcon() N6of$p'N  
{ UKZ )Boo  
 NOTIFYICONDATA data; n}[S  
 data.cbSize=sizeof(NOTIFYICONDATA); 0^dYu /i5  
 data.hWnd=GetSafeHwnd(); QRK\74'uY  
 data.uID=98; ^9Cu?!xu0  
 Shell_NotifyIcon(NIM_DELETE,&data); uSRhIKy  
 ShowWindow(SW_SHOW); b=xn(HE8|  
 SetForegroundWindow(); ppNMXbXR  
 ShowWindow(SW_SHOWNORMAL); NU?<bIQ  
 bTray=FALSE; "O0xh_Nr  
} !&hqj$>-}  
Dol{y=(3e  
void CCaptureDlg::OnChange() GVJ||0D  
{ LtX53c  
 RegisterHotkey(); Y1I)w^}:  
} _fu <`|kc  
#"rK1Z  
BOOL CCaptureDlg::RegisterHotkey() 2vLun   
{ 9$z$yGjl  
 UpdateData(); sH;_U)ssH  
 UCHAR mask=0; N'9T*&o+  
 UCHAR key=0; dH;2OWM  
 if(m_bControl) [8IO0lul+  
  mask|=4; tkcs6uy  
 if(m_bAlt) 5!fYTo|G>  
  mask|=2; eBnx$  
 if(m_bShift) S<Gm*$[7  
  mask|=1; K_YOp1  
  key=Key_Table[m_Key.GetCurSel()]; m<-!~ ew  
 if(bRegistered){ &xN+a{&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); `3i>e<m~  
  bRegistered=FALSE; mu@J$\   
 } bV&9>fC  
 cMask=mask; 2{63:f1c`'  
 cKey=key; >h;]rMD!|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -Q@f),  
 return bRegistered; 5X)M)"rq;V  
}  jb&MC 2  
>x;\H(g  
  四、小结 4BCe;Q^6  
pN5kcvQ  
  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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