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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: 9T2_2  
  <:(;#&<  
  一、实现方法 dj5|t~&  
LdOqV'&r  
  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: D\ZH1C!d  
|61ns6i!  
#pragma data_seg("shareddata") H{_D#It  
HHOOK hHook =NULL; //钩子句柄 [Ous|a[)o  
UINT nHookCount =0; //挂接的程序数目 +MYrNR.p  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 irw5<l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ORqqzy +  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (VkO[5j  
static int KeyCount =0; ,6^Xn=o #  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Y1AZ%{^0a  
#pragma data_seg() tpzh  
z<P?p  
  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。 }/tf^@  
D@5h$ m5  
  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: ZLVgK@l  
]p4?nT@]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >^W6'Q$P<  
cKey,UCHAR cMask) : maBec)  
{ Nv0a]Am  
 BOOL bAdded=FALSE; /EHO(d!<  
 for(int index=0;index<MAX_KEY;index++){ >'m&/&h  
  if(hCallWnd[index]==0){ LH`$<p2''r  
   hCallWnd[index]=hWnd; [SKDsJRPP  
   HotKey[index]=cKey; ~Sf'bj;(  
   HotKeyMask[index]=cMask; Gys-Im6>~@  
   bAdded=TRUE; GaJE(N  
   KeyCount++; C\Ob!sv%H  
   break; iz[IK%K  
  } W4#DeT  
 } R:'&>.AUw  
 return bAdded; UH7?JF-D  
} Az(,Q$"|5  
//删除热键 @qWClr{`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -)&lsFF  
{ -W/D Cj<  
 BOOL bRemoved=FALSE; 8"LM:0x  
 for(int index=0;index<MAX_KEY;index++){ [P6A $HC<  
  if(hCallWnd[index]==hWnd){ e<8KZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ TR `C|TV>  
    hCallWnd[index]=NULL; iYdg1  
    HotKey[index]=0; "NEKz  
    HotKeyMask[index]=0; Gw6Od j  
    bRemoved=TRUE; ^[+2P?^K  
    KeyCount--; ::GW  
    break; G7GKO  
   } " :[;}f;  
  } )Fqtb;W=  
 } 8MU7|9 Q  
 return bRemoved; z)eNM}cF  
} !6#.%"{-  
:.{d,)G  
gtY7N>e  
  DLL中的钩子函数如下: WhFE{-!gX  
/L]@k`.q@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) tp ky  
{ 2]x,joB  
 BOOL bProcessed=FALSE; ^"uD:f)  
 if(HC_ACTION==nCode) MP )nQ  
 { <P*7u\9&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3EA_-?  
   switch(wParam) D51O/.:U2  
   {  A-^B ?E  
    case VK_MENU: _?$')P|  
     MaskBits&=~ALTBIT; b+dmJ]c  
     break; ]r#NjP  
    case VK_CONTROL: v9gaRqi8  
     MaskBits&=~CTRLBIT; h7xgLe@  
     break; nxm*.&#p?  
    case VK_SHIFT: ;ae6h [  
     MaskBits&=~SHIFTBIT; ~X;sa,)L1+  
     break; ,z((?h,nm  
    default: //judge the key and send message '&]6(+I>  
     break; 27F:-C~.9  
   } x;4m@)Mu  
   for(int index=0;index<MAX_KEY;index++){ 5a&gdqg]  
    if(hCallWnd[index]==NULL) ILHn~d IC  
     continue; =wl0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ((BdT:T\_  
    { &k(tDP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h`tf!MD]  
     bProcessed=TRUE; 0 zjGL7  
    } 1@+&6UC  
   } '?$< k@mJW  
  } ]go.IfH  
  else if((lParam&0xc000ffff)==1){ //有键按下 m .En!~t  
   switch(wParam) V* ,u;*  
   { :yOJL [x  
    case VK_MENU: 5YiBPB")  
     MaskBits|=ALTBIT; G<~P||Lu^  
     break; kPnuU!  
    case VK_CONTROL: 7z8   
     MaskBits|=CTRLBIT; H_%ae' W  
     break; Ap}`Q(.  
    case VK_SHIFT: EOGz;:b&  
     MaskBits|=SHIFTBIT; h{PJ4U{W  
     break; u3PM 7z!~  
    default: //judge the key and send message uD`Z\@Z  
     break; 1| xKb (_l  
   } 3TKl  
   for(int index=0;index<MAX_KEY;index++){ d5=yAn-+=  
    if(hCallWnd[index]==NULL) \@7 4I7  
     continue; W jBtL52  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b$B-LvHd1  
    { j)jt&Gg'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N)YoWA>#bF  
     bProcessed=TRUE; uq]E^#^  
    } .zdmUS :  
   } Uetna!ABB  
  } XP@&I[J3sI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 U9//m=_  
   for(int index=0;index<MAX_KEY;index++){ sO&eV68 [  
    if(hCallWnd[index]==NULL) .1""U ']  
     continue; I#CS;Yh95  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 95-%>?4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1h?:gOig  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ze#ncnMo  
   } fH_Xm :%  
  } {?uswbk.  
 } 4"V6k4i5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &. "ltB  
} { *Wc`ZBY  
`b[@GGv  
  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: S2 YxA  
G#z9=NF~V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?*U:=|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1);E!D[  
8"x\kSMb  
  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=Y(rb  
Qkg([q4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N_y#Y{c{(  
{ ~fly6j|u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )0 i$Bo  
 { d>1#|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @|Hx >|p  
  SaveBmp(); ~RnBs`&!  
  return FALSE; >tV:QP]Y  
 } 4ak} "Z  
 …… //其它处理及默认处理 U,^jN|v  
} HlX2:\\  
H AMps[D[  
yI*h"?7T  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 l)91v"vJ  
~DK=&hCd!  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 LfG$?<}hR  
Fk&A2C}$b  
  二、编程步骤 /Oa.@53tK6  
Y]HtO^T2  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ;JR_z'<  
%v1*D^))  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ZUeA&&{  
m}fY5r<<;/  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; m_>~e}2'A  
<=!|U0YV  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 7#iT33(3  
4 {3< `  
  5、 添加代码,编译运行程序。 fm^)u"  
5[>N[}Ck>  
三、程序代码 h5m6 )0"  
%Z6\W; (n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5v-o2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f%TP>)jag!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ rwep e5  
#if _MSC_VER > 1000 ZlsdO.G  
#pragma once v D4<G{  
#endif // _MSC_VER > 1000 h}(GOY S)  
#ifndef __AFXWIN_H__ "]{"4qV1=  
#error include 'stdafx.h' before including this file for PCH dq$C COC^F  
#endif 1`8(O >5  
#include "resource.h" // main symbols @V# wYt  
class CHookApp : public CWinApp >iB-gj}>X  
{ f@= lK?Pfh  
 public: X~Vr}  
  CHookApp(); )VCRbz"[g  
  // Overrides ='|HUxFi  
  // ClassWizard generated virtual function overrides #pw=HHq*(  
  //{{AFX_VIRTUAL(CHookApp) Zr@G  
 public: auT$-Ki8  
  virtual BOOL InitInstance(); O1K~]Nt  
  virtual int ExitInstance(); N8:&v  
  //}}AFX_VIRTUAL 0NWtu]9QC  
  //{{AFX_MSG(CHookApp) E$8 4c+  
  // NOTE - the ClassWizard will add and remove member functions here. = g)G!  
  // DO NOT EDIT what you see in these blocks of generated code ! VpMPTEZ*L  
  //}}AFX_MSG spt='!)4  
  DECLARE_MESSAGE_MAP() xd`!z`X!,s  
}; ~_Mz05J-\_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); NQ(}rr'.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f@a@R$y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Li;(~_62a]  
BOOL InitHotkey(); (e;9 ,~u)  
BOOL UnInit(); {1ic* cZS  
#endif |E)IJj 3  
+t XOP|X  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ly] n2RK  
#include "stdafx.h" #TX=%x6  
#include "hook.h" H-,RzL/  
#include <windowsx.h> *AU"FI> V  
#ifdef _DEBUG {E~ MqrX  
#define new DEBUG_NEW sR. ecs+  
#undef THIS_FILE ?=uw0~O[  
static char THIS_FILE[] = __FILE__; z<F.0~)jb  
#endif Ng} AEAFp  
#define MAX_KEY 100 Q`}n; DV  
#define CTRLBIT 0x04 y[l19eU  
#define ALTBIT 0x02 NX(.Lw}  
#define SHIFTBIT 0x01 4%I(Z'*Cx  
#pragma data_seg("shareddata") yv<0fQ  
HHOOK hHook =NULL; X=p~`Ar M{  
UINT nHookCount =0; .#b!#   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \8!&X cA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /N ^%=G#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey nV0"q|0K;  
static int KeyCount =0; M#qZ0JT4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift snBC +`-  
#pragma data_seg() [D H@>:"dd  
HINSTANCE hins;  /y,~?  
void VerifyWindow(); )]%GNdU  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) eb)S<%R/  
//{{AFX_MSG_MAP(CHookApp) >Tld:  
// NOTE - the ClassWizard will add and remove mapping macros here. +mP3 y~|-j  
// DO NOT EDIT what you see in these blocks of generated code! 1Ly?XNS  
//}}AFX_MSG_MAP P$)9osr  
END_MESSAGE_MAP() 4\?I4|{pC  
4.3Bz1p&#  
CHookApp::CHookApp() V&_5q`L  
{  IjDG  
 // TODO: add construction code here, VYhZ0;' '  
 // Place all significant initialization in InitInstance }b YiyG\  
} zu}h3n5  
%f@VOSs  
CHookApp theApp; ?#\?&uFJ}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Lvc*L6  
{ }d)>pH  
 BOOL bProcessed=FALSE; +gOCl*L  
 if(HC_ACTION==nCode) =? xA*_^  
 { Ckvm3r\i2  
  if((lParam&0xc0000000)==0xc0000000){// Key up U$pHfNTH  
   switch(wParam) q01zN:|-1  
   { _qmB PUx  
    case VK_MENU: $+ZO{ (  
     MaskBits&=~ALTBIT; ^$_a_ft#  
     break; }{Lf 4|8  
    case VK_CONTROL: N`grr{*_  
     MaskBits&=~CTRLBIT; slHlfWHq  
     break; @}x)>tqD  
    case VK_SHIFT: _q=$L eO5  
     MaskBits&=~SHIFTBIT; [ WZ<d^L  
     break; OR( )D~:n  
    default: //judge the key and send message X<(h)&E  
     break; ZH`6>:  
   } o&?Tz*"l  
   for(int index=0;index<MAX_KEY;index++){ 8R:H{)o~s}  
    if(hCallWnd[index]==NULL) _>A])B ^  
     continue; 9))%tYN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F)_Rs5V:(  
    { K~@-*8%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n`68<ybl5  
     bProcessed=TRUE; rEdr8qw  
    } QD<^VY6  
   } f;pR8  
  } N!"GwH  
  else if((lParam&0xc000ffff)==1){ //Key down 5HL JkOV5  
   switch(wParam) 9|Jmj @9  
   { 9T|7edl  
    case VK_MENU: YIfPE{,  
     MaskBits|=ALTBIT; n1uJQt  
     break; KzeA+PI  
    case VK_CONTROL: \ fU{$  
     MaskBits|=CTRLBIT; '|4/aHU  
     break; 2{XQDOyA  
    case VK_SHIFT: ?_W "=WpC  
     MaskBits|=SHIFTBIT; yKOf]m>#  
     break; AWQwpaj-  
    default: //judge the key and send message 2;[75(l6|}  
     break; 1oj7R7  
   } V[+ Pb]  
   for(int index=0;index<MAX_KEY;index++) cKF02?)TX  
   { ^bL.|vB  
    if(hCallWnd[index]==NULL) k%NY,(:(  
     continue; 3'u%[bx E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0NpxqeIDY  
    { 5[X^1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Zf]d'oW{/  
     bProcessed=TRUE; *[W!ng  
    } MZ+8wr/y  
   } t}nZrD  
  } evg i\"  
  if(!bProcessed){ cy^6g? ew  
   for(int index=0;index<MAX_KEY;index++){ %Dsa ~{  
    if(hCallWnd[index]==NULL) JYm@Llf)$  
     continue; X-oou'4<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 79:x>i=  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X@af[J[cQ  
   } a_QO)  
  } kfm8F8sxl  
 } R\0]\JEc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); VC>KW{&J0  
} ;13lu1  
<diI*H<G  
BOOL InitHotkey() _jU6[y|XLh  
{ D\j1`  
 if(hHook!=NULL){ L\y,7@1%AT  
  nHookCount++; /d'^ XYOC  
  return TRUE; QE< 63|  
 } z56W5g2  
 else u4z]6?,"e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); qhF/iUE  
  if(hHook!=NULL) e *;"$7o9  
   nHookCount++; kwGj 7'  
  return (hHook!=NULL);  <MvFAuAT  
} vuDp_p*]S  
BOOL UnInit()  @tDVW *!  
{ JO+ hD4L  
 if(nHookCount>1){ "vU:qwm  
  nHookCount--; NYR^y \u  
  return TRUE; [u)^QgP  
 } Uy_`=JZ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7OC ,KgJ3  
 if(unhooked==TRUE){ CzNSJVE5  
  nHookCount=0; u^ngD64  
  hHook=NULL; 8.Y6r  
 } /Pg66H#RUf  
 return unhooked; L8R|\Bx  
} 1|z>} xP  
OWOj|jM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AU-/-h=Mr  
{ ua4QtDSs  
 BOOL bAdded=FALSE; Qo;$iLt  
 for(int index=0;index<MAX_KEY;index++){ NwT3e&u%|  
  if(hCallWnd[index]==0){ V)N9V|O'  
   hCallWnd[index]=hWnd; z${B|  
   HotKey[index]=cKey; w? !@fu  
   HotKeyMask[index]=cMask; #FuOTBNvB  
   bAdded=TRUE;  U]e;=T:3  
   KeyCount++; V\ARe=IWM  
   break; Eg  w?  
  } 3TtnLay.k  
 } 5Z`f)qE  
 return bAdded; ]dk~C?H  
} gtCd#t'(V  
Q4c>gds`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n/^wzG  
{ lD !^MqK  
 BOOL bRemoved=FALSE; p(U' c}@2  
 for(int index=0;index<MAX_KEY;index++){ lv$tp,+  
  if(hCallWnd[index]==hWnd){ _4.`$n/Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v9M ;W+J  
    hCallWnd[index]=NULL; 5OKbW!  
    HotKey[index]=0; G.T}^ xHmL  
    HotKeyMask[index]=0; Q3z-v&^E9  
    bRemoved=TRUE; T-|z18|!  
    KeyCount--; Sfh\4h$H  
    break; 6I_W4`<VeZ  
   } )ALf!E%{  
  } SB eb}LZ  
 } Ej6vGC.,  
 return bRemoved; kS=OX5  
} Zr oj-3-X~  
<A"}Krq?  
void VerifyWindow() WI}P(!h\J  
{ ;uDH&3W  
 for(int i=0;i<MAX_KEY;i++){ OU0\xx1/  
  if(hCallWnd!=NULL){ |*OS;FD5  
   if(!IsWindow(hCallWnd)){ =3/||b4c  
    hCallWnd=NULL; ~{U~9v^v (  
    HotKey=0; ur*1I/v  
    HotKeyMask=0; A9$q;8= <  
    KeyCount--; ETjlq]@j  
   } #/5jWH7U  
  } x*bM C&Ea  
 } m:Z=: -x  
} oDM}h +  
XP6R$0yN  
BOOL CHookApp::InitInstance() 0'z$"(6D  
{ 2x3&o|J  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,Iwri\  
 hins=AfxGetInstanceHandle(); x:@HtTX  
 InitHotkey(); EiIbp4*e  
 return CWinApp::InitInstance(); (ioi !p  
} BE}lzn=sF  
@ZD1HA,h"  
int CHookApp::ExitInstance() 8cR4@Hqx  
{ ykX}T6T  
 VerifyWindow(); p4HX83y{  
 UnInit(); LnrR#fF]Z  
 return CWinApp::ExitInstance(); Z"% =  
} +a nNpy  
}c%QF  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file jyLpe2 S  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \W}?4kz  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rc 9 \  
#if _MSC_VER > 1000 Bb8lklQ  
#pragma once $*L@y m  
#endif // _MSC_VER > 1000 ak0KrVF  
yxLGseD  
class CCaptureDlg : public CDialog MDl  
{ U#d&#",s  
 // Construction 8WfF: R;  
 public: 'zi5ihiT  
  BOOL bTray; ?Z*LTsPr  
  BOOL bRegistered; VO#]IXaP  
  BOOL RegisterHotkey(); ;:8_H0X'K  
  UCHAR cKey; 2O`uzT$  
  UCHAR cMask; mY#[D; mUe  
  void DeleteIcon(); HQ ^> ~  
  void AddIcon(); qRTxg%  
  UINT nCount; mNWmp_c,1  
  void SaveBmp(); uTBls8  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor o @~XX@5l  
  // Dialog Data =>4>Z_q  
  //{{AFX_DATA(CCaptureDlg) V ,*YM   
  enum { IDD = IDD_CAPTURE_DIALOG }; k]ptk^  
  CComboBox m_Key; ^HX={(ddK  
  BOOL m_bControl; 2 os&d|  
  BOOL m_bAlt; QYyF6ht=!  
  BOOL m_bShift; ATk>:^n  
  CString m_Path; dkLc"$( O  
  CString m_Number; o/2\8   
  //}}AFX_DATA FFK79e/5  
  // ClassWizard generated virtual function overrides r-H~MisL  
  //{{AFX_VIRTUAL(CCaptureDlg) Z\6azhbI}  
 public: %:YON,1b=7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); leg@ia  
 protected: "Yq-s$yBi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #Z98D9Pv`o  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %n=!H  
  //}}AFX_VIRTUAL V-O49  
  // Implementation 2JUX29rER  
 protected: -r/#20Y  
  HICON m_hIcon; bhnm<RZ  
  // Generated message map functions eLL> ThMyW  
  //{{AFX_MSG(CCaptureDlg) toX4kmC  
  virtual BOOL OnInitDialog(); `m`jX|`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); rcOpOoU|  
  afx_msg void OnPaint(); !M)!  
  afx_msg HCURSOR OnQueryDragIcon(); gE`G3kgn{  
  virtual void OnCancel(); MS_&;2  
  afx_msg void OnAbout(); rs=wEMq/  
  afx_msg void OnBrowse(); PF1!aAvVb  
  afx_msg void OnChange(); 0A9x9l9Wd  
 //}}AFX_MSG ;7K5Bo  
 DECLARE_MESSAGE_MAP() E )09M%fe  
}; "z=A=~~<{  
#endif +}I[l,,xy  
b+[9) B)a?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file de[c3!#1d  
#include "stdafx.h" zVGjXuNa  
#include "Capture.h" A\i /@x5#  
#include "CaptureDlg.h" [WRs1$5  
#include <windowsx.h> r*0a43mC1  
#pragma comment(lib,"hook.lib") .gG<08Z  
#ifdef _DEBUG 7$8z}2  
#define new DEBUG_NEW 1AjsAi,7;2  
#undef THIS_FILE +r2E5s   
static char THIS_FILE[] = __FILE__; {5#P1jlT  
#endif  ^G~W}z?-  
#define IDM_SHELL WM_USER+1 0u'4kF!P!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9bMM-~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O->i>d  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Y)hLu:P]  
class CAboutDlg : public CDialog &Sa<&2W4S  
{ x +q"%9.c  
 public: 2 t< dCw  
  CAboutDlg(); >#$( M5&}-  
  // Dialog Data K.*?\)&  
  //{{AFX_DATA(CAboutDlg) )gmDxD ^C  
  enum { IDD = IDD_ABOUTBOX }; d?v#gW  
  //}}AFX_DATA 0 u,=OvU  
  // ClassWizard generated virtual function overrides wf=#w}f  
  //{{AFX_VIRTUAL(CAboutDlg) prlB9,3|C  
 protected: 5y(irbk7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;}A#ws_CD_  
  //}}AFX_VIRTUAL vk5pnCM^3  
  // Implementation kZU8s'C  
 protected: >m:.5][yu  
  //{{AFX_MSG(CAboutDlg) 79s6U^vv"  
  //}}AFX_MSG r[TS#hQ  
  DECLARE_MESSAGE_MAP() ' uo`-Y  
}; 8MX/GF;F  
6x]|IWvW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6zRJ5uI,/  
{ .x(&-  
 //{{AFX_DATA_INIT(CAboutDlg) Uf4QQ `c#  
 //}}AFX_DATA_INIT KfG%#2\G_  
} hX`WVVoF  
JV36@DVQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >:W)9o  
{ JEdtj1v{O  
 CDialog::DoDataExchange(pDX); ,H22;UV9  
 //{{AFX_DATA_MAP(CAboutDlg) 7KRc^ *pZs  
 //}}AFX_DATA_MAP c*RZbE9k  
} R:E6E@T  
@T;O^rE~N  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [O"i!AQ  
 //{{AFX_MSG_MAP(CAboutDlg) >B8)Wb :  
 // No message handlers X2 M<DeF:  
 //}}AFX_MSG_MAP Ef%8+_  
END_MESSAGE_MAP() ;cp-jY_U  
gW/H#T,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oxO}m7 ULH  
: CDialog(CCaptureDlg::IDD, pParent) "sT`Dhr  
{ &Ei dc .  
 //{{AFX_DATA_INIT(CCaptureDlg) GVn9=[r  
  m_bControl = FALSE; m9#u. Q*  
  m_bAlt = FALSE; "Y(S G  
  m_bShift = FALSE; :&?#~NFH  
  m_Path = _T("c:\\"); &=$8 v"&^  
  m_Number = _T("0 picture captured."); *ivbk /8  
  nCount=0; w2+RX-6Ie  
  bRegistered=FALSE; ( fdDFb#1  
  bTray=FALSE; Q.z2 (&  
 //}}AFX_DATA_INIT 1 _5[5K^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Wv=L_E_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $ZcmE<7k  
} D cus-,u~  
*k+QX   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /jj!DO#  
{ y{j>4g$:z  
 CDialog::DoDataExchange(pDX); N..9N$+(  
 //{{AFX_DATA_MAP(CCaptureDlg) yt!K|g  
  DDX_Control(pDX, IDC_KEY, m_Key); B2845~\.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .*Hv^_  
  DDX_Check(pDX, IDC_ALT, m_bAlt); tCc}}2bC&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1"v;w!uh  
  DDX_Text(pDX, IDC_PATH, m_Path); m.V mS7_I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); LR9'BUfFv  
 //}}AFX_DATA_MAP QtN0|q{af  
} cst=ms  
#(  kT  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _I$]L8hC  
//{{AFX_MSG_MAP(CCaptureDlg) >@oO7<WB  
 ON_WM_SYSCOMMAND() ][?GJ"O+U  
 ON_WM_PAINT() <m@U`RFm  
 ON_WM_QUERYDRAGICON() HH+rib'u  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @kqy!5)K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |9_e2OwH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .Bi7~*N  
//}}AFX_MSG_MAP IgFz[)  
END_MESSAGE_MAP() {|rwIRe  
ZT^PL3j+  
BOOL CCaptureDlg::OnInitDialog() *-P@|eg  
{ b%)a5H(  
 CDialog::OnInitDialog(); pAa{,,Qc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .S5&MNE  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0j_!)B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); D~mGv1t"  
 if (pSysMenu != NULL) }>0UaK  
 { ")sq?1?X  
  CString strAboutMenu; [6/ %ynlP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); IF1?/D"<  
  if (!strAboutMenu.IsEmpty()) aqyXxJS8  
  { a(J~:wgd  
   pSysMenu->AppendMenu(MF_SEPARATOR); pkxW19h*0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DAvAozM  
  } V'6%G:?0a  
 } \}<nXn!  
 SetIcon(m_hIcon, TRUE); // Set big icon #v~5f;[AAs  
 SetIcon(m_hIcon, FALSE); // Set small icon Z>X -ueV  
 m_Key.SetCurSel(0); sX**'cH  
 RegisterHotkey(); SgY>$gP9S  
 CMenu* pMenu=GetSystemMenu(FALSE); ;XTP^W!6f  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z#Zk)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \,_%e[g49  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9xWeVlfQ  
 return TRUE; // return TRUE unless you set the focus to a control )?_c7 R  
} YHAy+S  
VTV-$Du[}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) U,+=>ns>  
{ n\P{Mc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0<P -`|X  
 { IB?5y~+h  
  CAboutDlg dlgAbout; Qb SX'mx<  
  dlgAbout.DoModal(); Uh9$e  
 } V= .'Db2D  
 else 7d9%L}+q  
 { nNL9B~d  
  CDialog::OnSysCommand(nID, lParam); .IG(Y!cB  
 } Q *lZ;~R  
} -ff*,b$Q/  
gMgbqGF)  
void CCaptureDlg::OnPaint() \6sp"KqP  
{ 2>UyA.m0  
 if (IsIconic()) #^eviF8  
 { Jj([O2Eq$  
  CPaintDC dc(this); // device context for painting ^Ji5)c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5$jKw\FF=  
  // Center icon in client rectangle Z!ub`coV[  
  int cxIcon = GetSystemMetrics(SM_CXICON); cl{;%4$9  
  int cyIcon = GetSystemMetrics(SM_CYICON); q5QYp  
  CRect rect; a|66[  
  GetClientRect(&rect); #Ok*O r  
  int x = (rect.Width() - cxIcon + 1) / 2; *%Q!22?6F  
  int y = (rect.Height() - cyIcon + 1) / 2; -,p(PK  
  // Draw the icon ^S[Mg6J  
  dc.DrawIcon(x, y, m_hIcon); :;]6\/ky  
 } xy[R9_V  
 else o,u-%  
 { ` NcWy  
  CDialog::OnPaint(); r6j 3A  
 } _ea!psA0  
} IEO5QV:u:  
e6]u5;B r  
HCURSOR CCaptureDlg::OnQueryDragIcon() Q7f\ 5QjT  
{ up`!r;5-  
 return (HCURSOR) m_hIcon; !7Ta Vx}`(  
} ULAAY$o@5  
{3!v<CY'  
void CCaptureDlg::OnCancel() ,LU/xI0O  
{ rFdovfb   
 if(bTray) >H?8?a D  
  DeleteIcon(); K^w(WE;db  
  CDialog::OnCancel(); A=E1S{C  
} - x@mS2  
?r#e  
void CCaptureDlg::OnAbout() c`AtK s)u  
{ tec CU[O  
 CAboutDlg dlg; b=`h""u  
 dlg.DoModal(); Pf-k"7y  
} wjQu3 ,Cj  
^6oz3+  
void CCaptureDlg::OnBrowse() Hj$JXo[U  
{ HTvA]-AuM  
 CString str; LZ}C{M{=5A  
 BROWSEINFO bi; U"af3c^2  
 char name[MAX_PATH]; >2,x#RQs  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x{j|Tf3,G  
 bi.hwndOwner=GetSafeHwnd(); W{Ine> a'  
 bi.pszDisplayName=name; nB WVG  
 bi.lpszTitle="Select folder"; iE!\)7y  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; z*"zXL C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >7p?^*&7;  
 if(idl==NULL) SBg BZm}%  
  return; d.3-@^P  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \f5$L`  
 str.ReleaseBuffer(); db'Jl^  
 m_Path=str; v&;q4b4  
 if(str.GetAt(str.GetLength()-1)!='\\') m?V4r#t  
  m_Path+="\\"; "FwbhD0Gb  
 UpdateData(FALSE); -O:+?gG  
} W MU9tq[  
py6|uGN  
void CCaptureDlg::SaveBmp() ` <cB 6  
{ ?<STt 9  
 CDC dc; !-_0I:m  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Az8>^|@  
 CBitmap bm; NiQ`,Q$B  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~k'KS 7c  
 int Height=GetSystemMetrics(SM_CYSCREEN); N0,wT6.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YIvJN  
 CDC tdc; M,7A|?O  
 tdc.CreateCompatibleDC(&dc); =* oFs|v  
 CBitmap*pOld=tdc.SelectObject(&bm); FctqE/>}I  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w]J9Kv1)-  
 tdc.SelectObject(pOld); ouL/tt_~  
 BITMAP btm; dbQUW#<Q  
 bm.GetBitmap(&btm); ;P3sDN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L0H;y6&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hy3j8?66  
 BITMAPINFOHEADER bih; ze@NqCF  
 bih.biBitCount=btm.bmBitsPixel; iZ}  w>1  
 bih.biClrImportant=0; U` uP^  
 bih.biClrUsed=0; tpOMKh.`  
 bih.biCompression=0; 7 p}J]!Z  
 bih.biHeight=btm.bmHeight; osPJ%I`^  
 bih.biPlanes=1; #Drs=7w  
 bih.biSize=sizeof(BITMAPINFOHEADER); %5Hsd  
 bih.biSizeImage=size; y !)  
 bih.biWidth=btm.bmWidth; bw\fKZ  
 bih.biXPelsPerMeter=0; 3z';Zwz &X  
 bih.biYPelsPerMeter=0; = _X#JP79  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D/uGL t~D(  
 static int filecount=0; Dvbrpn!sk  
 CString name; |h$*z9bsf  
 name.Format("pict%04d.bmp",filecount++); |:BKexjHL  
 name=m_Path+name; 7N9~nEU  
 BITMAPFILEHEADER bfh; +aR.t@D+"Y  
 bfh.bfReserved1=bfh.bfReserved2=0; AlT41v~6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +y'V  
 bfh.bfSize=54+size; 3NAU|//J  
 bfh.bfOffBits=54; mO<sw  
 CFile bf; 8|*#r[x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |W4 \  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E^B*:w3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4gbi?UAmX  
  bf.WriteHuge(lpData,size); VtIPw&KHW  
  bf.Close(); -;9pZ'r  
  nCount++; kzU;24"K  
 } \9k$pC+l  
 GlobalFreePtr(lpData); FYq]-k{\  
 if(nCount==1) 9DcUx-   
  m_Number.Format("%d picture captured.",nCount); o_; pEe  
 else ;Yo9e~  
  m_Number.Format("%d pictures captured.",nCount); B^g+_;  
  UpdateData(FALSE); , Fo7E  
} 7oaa)  
E)z[@Np  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) juOOD   
{ b[p<kMTir  
 if(pMsg -> message == WM_KEYDOWN) nn>< k"  
 { (}E-+:vFU  
  if(pMsg -> wParam == VK_ESCAPE) at7|r\`?-  
   return TRUE; v\7k  
  if(pMsg -> wParam == VK_RETURN) w20E]4"  
   return TRUE; ER,,K._?B  
 } 'A@[a_  
 return CDialog::PreTranslateMessage(pMsg); 8was/^9;  
} Ch-56   
kcT?<r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rx`G* k{X  
{ {6MLbL{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 04-phEA2Q  
  SaveBmp(); #:Z"V8n'  
  return FALSE; bSHlR#!6  
} 2y; |6`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :()(P9?  
 CMenu pop; #k? Rl  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [?TQ!l}8A  
 CMenu*pMenu=pop.GetSubMenu(0); OdX-.FFl  
 pMenu->SetDefaultItem(ID_EXITICON); e  iS~*@  
 CPoint pt; g*$ 0G  
 GetCursorPos(&pt); ^aVoH/q*C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =w &%29BYq  
 if(id==ID_EXITICON) mY"DYYR>  
  DeleteIcon(); +js3o@Ku{\  
 else if(id==ID_EXIT) L'=e /&  
  OnCancel(); Yo0%5 noz  
 return FALSE; m(JFlO  
} 6S?a57;&W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); !NuYx9L?L  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) oH~ZqX.3  
 AddIcon();  /bA\O   
 return res; rN#ydw:9  
}  I 0ycLx  
!v\m%t|.  
void CCaptureDlg::AddIcon() 5xW)nEV  
{ ;aYPv8s~,:  
 NOTIFYICONDATA data; ,-u | l  
 data.cbSize=sizeof(NOTIFYICONDATA); U,/NygB~  
 CString tip; WH :+HNl1d  
 tip.LoadString(IDS_ICONTIP); jeb<qi>  
 data.hIcon=GetIcon(0); V M[9!:  
 data.hWnd=GetSafeHwnd(); Avw"[~Xd  
 strcpy(data.szTip,tip); g-xbb&]  
 data.uCallbackMessage=IDM_SHELL; }]sI?&xB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :K{`0U&l5  
 data.uID=98; EVmQ"PKL'  
 Shell_NotifyIcon(NIM_ADD,&data); xD#PM |I  
 ShowWindow(SW_HIDE); >K#Z]k  
 bTray=TRUE; >VP\@xt(R[  
} YlOYgr^  
jM J[6qj  
void CCaptureDlg::DeleteIcon() | (P%<  
{ r5[om$|*  
 NOTIFYICONDATA data; f ;|[  
 data.cbSize=sizeof(NOTIFYICONDATA); GN{\ccej  
 data.hWnd=GetSafeHwnd(); Zx25H"5j  
 data.uID=98; ~bT0gIc  
 Shell_NotifyIcon(NIM_DELETE,&data); d%9I*Qo0,  
 ShowWindow(SW_SHOW); x@.iDP@(  
 SetForegroundWindow(); _5M!ec  
 ShowWindow(SW_SHOWNORMAL); IC[SJVH;  
 bTray=FALSE; +`f gn9p  
} x[nv+n ,  
WlP@Tm5g/  
void CCaptureDlg::OnChange() =pWpHbB.  
{ =B1t ?( "  
 RegisterHotkey(); O|,+@qtH  
} )ACa0V>*p  
)Tngtt D  
BOOL CCaptureDlg::RegisterHotkey() m'k`p5[=h  
{ : ` F>B  
 UpdateData(); 3D\.S j%  
 UCHAR mask=0; eJ{"\c(  
 UCHAR key=0; g ^)>-$=  
 if(m_bControl) S,AZrgh,"X  
  mask|=4; R ;5w*e}?5  
 if(m_bAlt) ?O4Dhu  
  mask|=2; y#AY+ >  
 if(m_bShift) 9[T#uh!DC  
  mask|=1; c'`7p/l.  
  key=Key_Table[m_Key.GetCurSel()]; q*{"6"4(  
 if(bRegistered){ idO3/>R [  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e@]cI/j  
  bRegistered=FALSE; n^&QOII@>  
 } cIM5;"gLP  
 cMask=mask; 8"8{Nf-"  
 cKey=key; Qg 6m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); W\~ZmA.  
 return bRegistered; 5jNBt>.0  
} )STt3.  
#s yP=  
  四、小结 DvOg|XUU0  
*y(2BrL>  
  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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