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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: \iru7'S  
  zA s&%OjG  
  一、实现方法 9tK>gwb  
p@ygne 4  
  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: b9Y_!Qe  
#cU^U#;=r  
#pragma data_seg("shareddata") gn ?YF`  
HHOOK hHook =NULL; //钩子句柄 *HE^1IEl  
UINT nHookCount =0; //挂接的程序数目 k_aW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +xp]:h|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?n]FNjd  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iW;i!,  
static int KeyCount =0; eLfvMPVo  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 rh%m;i<b  
#pragma data_seg() ^Ga&}-  
2f{T6=SK  
  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。 xA h xD|4_  
pQWHG#?7  
  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: G[Tl%w  
{]kaJ{U>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cCi I{  
cKey,UCHAR cMask) gfy19c 9  
{  8=;k"  
 BOOL bAdded=FALSE; A\QJLWBv^$  
 for(int index=0;index<MAX_KEY;index++){ x/mp=  
  if(hCallWnd[index]==0){ qlsQ|/'D  
   hCallWnd[index]=hWnd; |L::bx(  
   HotKey[index]=cKey;  !HK^AwNY  
   HotKeyMask[index]=cMask; UiQEJXwnz  
   bAdded=TRUE; nFM@@oA  
   KeyCount++; H!)=y  
   break; 2/7_;_#vJ%  
  } E167=BD9<  
 } A??@AP[7M  
 return bAdded; ~i~%~doa  
} C~4PE>YtTv  
//删除热键 ,Zf 9RM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .Y*f2A.v  
{ gTf|^?vd  
 BOOL bRemoved=FALSE; <a^Oj LLU  
 for(int index=0;index<MAX_KEY;index++){ kkCZNQ~I  
  if(hCallWnd[index]==hWnd){ r[txlQI9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !>$4]FkV  
    hCallWnd[index]=NULL; 4QHS{tj  
    HotKey[index]=0; I f-_?wZe  
    HotKeyMask[index]=0; :t("L-GPW  
    bRemoved=TRUE; GqKsK r2%  
    KeyCount--; \2C`<h$fN  
    break; PWr(*ZP>hI  
   } 39i9wrP  
  } B4Y(?JTx  
 } G$M9=@Ug  
 return bRemoved; P9Q~r<7n  
} ]T:;Vo  
|N/G'>TS  
23\RJpKb  
  DLL中的钩子函数如下: &a0r%L()X  
6xK[34~ 6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uQ1@b-e`5  
{ J3RB]O_  
 BOOL bProcessed=FALSE; W_|0y4QOo  
 if(HC_ACTION==nCode) =='Td[  
 { YIRZ+H<Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xw5d|20b  
   switch(wParam) |SZo' 6  
   {  =8Jfgq9E  
    case VK_MENU: V9yl4q-bL  
     MaskBits&=~ALTBIT; D/ybFk  
     break; N "tFP9;K  
    case VK_CONTROL: `r"+644  
     MaskBits&=~CTRLBIT; ZUm?*.g\^  
     break; :ue:QSt(u  
    case VK_SHIFT: LkruL_E>  
     MaskBits&=~SHIFTBIT; 1$/MrPT(b  
     break; (IqZ@->nw  
    default: //judge the key and send message x&sI=5l  
     break; K7knK  
   } 6 gL=u-2  
   for(int index=0;index<MAX_KEY;index++){ pIV-kI:w  
    if(hCallWnd[index]==NULL) C@ZK~Y_g  
     continue; O|IG_RL]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ks^6.)  
    { OVzt\V*+%W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "xI"  
     bProcessed=TRUE; 94uN I8  
    } Xazo 9J  
   } e1(Q(3  
  } XgN` 7!Z  
  else if((lParam&0xc000ffff)==1){ //有键按下 : JzI>/  
   switch(wParam) EKEjv|_)  
   { ,u }XW V  
    case VK_MENU: 5,qj7HZF  
     MaskBits|=ALTBIT; =!O*/6rz  
     break; ptatzp]c#  
    case VK_CONTROL: yzw mT  
     MaskBits|=CTRLBIT; 8KB>6[H!wE  
     break; <?-YTY|  
    case VK_SHIFT:  B[=(#W  
     MaskBits|=SHIFTBIT; (fNUj4[  
     break; F>tQn4  
    default: //judge the key and send message  ~\,w {  
     break; ](tx<3h  
   } 3 &u_A?;  
   for(int index=0;index<MAX_KEY;index++){ m }a|FS  
    if(hCallWnd[index]==NULL) mK+IEZV<3  
     continue; !TZhQiorC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D']ZlB 'K  
    { P 71(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~!s-o|N_\  
     bProcessed=TRUE; 5w%_$x  
    } s2?T5oWU  
   } Fc~'TBf,,`  
  } rG#Z=*b%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }I 3gU  
   for(int index=0;index<MAX_KEY;index++){ b'VV'+|  
    if(hCallWnd[index]==NULL) gu#-O?B  
     continue; mj|)nOd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4}_O`Uxh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2*(Z==XC7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |mdi]TL  
   } 0|R# Tb;Y  
  } [ W2fd\4  
 } 4}`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h;=6VgXZ  
} OB[o2G<0  
N`)$[&NG]  
  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: \Mg`(,kwe  
>iS`pb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8$(Dz]v|[&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )tCX y4  
Zy|Mz&  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: RI68%ZoL  
rr#K"SP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V5p= mmnA,  
{ -P&6L\V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Lm@vXgMD  
 { "V&+7"Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `"qP  
  SaveBmp(); 0 IQ'3_  
  return FALSE; {.yStB. T  
 }  ]xguBh]  
 …… //其它处理及默认处理 E*#]**  
} ?$e9<lsQq)  
VUI|.76g  
6a;v&5  
  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。 nFe%vu8a  
)sho*;_o  
  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。 TYI7<-Mp:[  
K |DWu8  
  二、编程步骤  JHf  
W>q HFoKa  
  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"; }du XC[6  
CRbdAqofV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &W f3~hmo  
@iEA:?9uX  
  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; rHP%0f 9:  
u*qV[y5Bl  
  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; d|T!v  
"*,XL uv>  
  5、 添加代码,编译运行程序。 &qS[%K )  
[!%![E  
三、程序代码 M>M`baM1  
_gD pKEaY  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +:3*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 5MzFUv0)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0@2mXO9f"  
#if _MSC_VER > 1000 9o>8o  
#pragma once yjJ5P`j]  
#endif // _MSC_VER > 1000 OLI$1d_  
#ifndef __AFXWIN_H__ nYbhy} y  
#error include 'stdafx.h' before including this file for PCH w1UA?+43  
#endif w,Ee>cV]a  
#include "resource.h" // main symbols v:+ ~9w+  
class CHookApp : public CWinApp !45.puL0  
{ 7 bDHXn  
 public: wu"&|dt  
  CHookApp(); b=3H  
  // Overrides _,</1~.  
  // ClassWizard generated virtual function overrides nNXgW  
  //{{AFX_VIRTUAL(CHookApp) *'"^NSJ  
 public: <, 3ROo76  
  virtual BOOL InitInstance(); c^`]`xiX  
  virtual int ExitInstance(); %7O?JI [  
  //}}AFX_VIRTUAL uIU5.\"s  
  //{{AFX_MSG(CHookApp) ki>~H!zB  
  // NOTE - the ClassWizard will add and remove member functions here. #2iD'>bQ  
  // DO NOT EDIT what you see in these blocks of generated code ! wp7!>% s{  
  //}}AFX_MSG |a{Q0:  
  DECLARE_MESSAGE_MAP() )/t?!T.[  
}; C ;(t/zh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 42L @w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "`asF g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UU8pz{/  
BOOL InitHotkey(); HK+/:'P u  
BOOL UnInit(); jSc#+_y  
#endif (@WA1oNG  
0EJ(.8hwm  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5JhdV nT_  
#include "stdafx.h" Zf5`XslA.  
#include "hook.h" K R"M/#  
#include <windowsx.h> oq*N_mP0  
#ifdef _DEBUG UJs$q\#RO  
#define new DEBUG_NEW  JMdPwI  
#undef THIS_FILE r < cVp^  
static char THIS_FILE[] = __FILE__; 3Tq\BZ  
#endif ^9-&o  
#define MAX_KEY 100 X>?b#Eva  
#define CTRLBIT 0x04 Mc!Xf[  
#define ALTBIT 0x02 )#F]G$51r  
#define SHIFTBIT 0x01 q64k7<C,  
#pragma data_seg("shareddata") 16SOIT  
HHOOK hHook =NULL; /s];{m|>  
UINT nHookCount =0; >&!RWH9*q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vy,&N^P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $)H@|< K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,YhdY 6  
static int KeyCount =0; Cye$H9 2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ={?v Ab:  
#pragma data_seg() 7H>@iI"?  
HINSTANCE hins; OIl#DV.  
void VerifyWindow(); ;+1RU v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) XhsTT2B   
//{{AFX_MSG_MAP(CHookApp) ~ 8aJ S,u  
// NOTE - the ClassWizard will add and remove mapping macros here. X0*QV- RN  
// DO NOT EDIT what you see in these blocks of generated code! nL:SG{7  
//}}AFX_MSG_MAP <5=JE*s$NS  
END_MESSAGE_MAP() ^t7x84jhL  
>%E([:$A  
CHookApp::CHookApp() #yI.nzA*  
{ e?bYjJ q  
 // TODO: add construction code here, JY!l!xH(6  
 // Place all significant initialization in InitInstance m5G\}8|  
} j PnM>=  
PA w-6;  
CHookApp theApp; 4 g. bR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a(]`F(L  
{ I]!^;))  
 BOOL bProcessed=FALSE; E2L(wt}^  
 if(HC_ACTION==nCode) }IEb yb  
 { )6~1 ^tD  
  if((lParam&0xc0000000)==0xc0000000){// Key up P6,7]6bp  
   switch(wParam) :R):b  
   { Jw~( G9G  
    case VK_MENU: ,@z4I0cTi\  
     MaskBits&=~ALTBIT; n]+W 3[i  
     break; aAu>Tn86D.  
    case VK_CONTROL: l<(Y_PE:  
     MaskBits&=~CTRLBIT; r3rxC&  
     break; qW 1V85FG  
    case VK_SHIFT: W(fr<<hL  
     MaskBits&=~SHIFTBIT; Da$r`  
     break;  g/UaYCjM  
    default: //judge the key and send message Y,8KPg@W  
     break; P\CDd=yWc  
   } )Z+{|^`kJ  
   for(int index=0;index<MAX_KEY;index++){ 2}?wYI*:5|  
    if(hCallWnd[index]==NULL) l:]Nn%U(>  
     continue; ~8|t*@D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :T3/yd62N  
    { &4dz}zz90  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #[MJ|^\i  
     bProcessed=TRUE; iA_8(Yo  
    } ydv3owN  
   } 7nzGAz_W  
  } M9!AIHq4  
  else if((lParam&0xc000ffff)==1){ //Key down a:YI"*S  
   switch(wParam) !2:3MbtR  
   { iAMtejw  
    case VK_MENU: 6{d6s#|%  
     MaskBits|=ALTBIT; U-wLt(Y<  
     break; t"j|nz{m  
    case VK_CONTROL: h  x6;YV  
     MaskBits|=CTRLBIT; !S%6Uzsj  
     break; zm9TvoC%}  
    case VK_SHIFT: CBf7]n0H  
     MaskBits|=SHIFTBIT; CLKov\U\  
     break; CGw--`#\  
    default: //judge the key and send message pO<-.,  
     break; O$`UCq  
   } x}$e}8|8YL  
   for(int index=0;index<MAX_KEY;index++) *p ? e.%nd  
   { $3=:E36K  
    if(hCallWnd[index]==NULL) H]<]^Zmjy  
     continue; (UNtRz'=;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B6Ej{q^k,  
    { ~fz[x9\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $N$ FtpB  
     bProcessed=TRUE; 1-I Swd'u  
    } *5%*|>  
   } D}Ilyk_uUw  
  } puJ#w1!x`  
  if(!bProcessed){ !/K8xD$  
   for(int index=0;index<MAX_KEY;index++){ :<#`_K~'  
    if(hCallWnd[index]==NULL) gM;}#>6  
     continue; XM Vq-8B0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [AEBF2OIv  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TY;U2.Ud  
   } LE?u`i,e=+  
  } -jg (GGJ  
 } sPNfbCOz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ( g :p5Rl  
} M/V(5IoP (  
$mco0 %$  
BOOL InitHotkey() zvv:dC/p<  
{ d_}a`H  
 if(hHook!=NULL){ HW=xvA+  
  nHookCount++; "C%!8`K{a*  
  return TRUE; D1,O:+[;.  
 }  Kn+=lCk  
 else wCZO9sU:6=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  *2u E  
  if(hHook!=NULL) 8dT'xuch  
   nHookCount++; FYPz 4K  
  return (hHook!=NULL); AZFWuPJo  
} o}8{Bh^  
BOOL UnInit() 0/]_nd  
{ ^[h2%c$  
 if(nHookCount>1){ =.m6FRsU  
  nHookCount--; 2]jPv0u  
  return TRUE; "2n;3ByR  
 } ){Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !"4w&bQ  
 if(unhooked==TRUE){ !awh*Xj6  
  nHookCount=0; PN F4>)  
  hHook=NULL; RJ J1  
 } [J\DB)V/  
 return unhooked; ui.'^F<  
} Y4~vC[$ x'  
G_oX5:J*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }6~)bLzI}  
{ jOv"<  
 BOOL bAdded=FALSE; q&M:17+:Q  
 for(int index=0;index<MAX_KEY;index++){ <GWR7rUH  
  if(hCallWnd[index]==0){ lC9S\s  
   hCallWnd[index]=hWnd; AF#_nK) @  
   HotKey[index]=cKey; {*=E?oF@  
   HotKeyMask[index]=cMask; j8 H Oc(  
   bAdded=TRUE; WEa>)@  
   KeyCount++; rnvQ<671W  
   break; S!j^|!  
  } ?R?Grw)`H  
 } `mErF%b  
 return bAdded; ^tE_LL+ji|  
} vj3isI4lU  
R`He^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?vu|o'$T,  
{ qyv"Wb6+  
 BOOL bRemoved=FALSE; N#Ag'i4HF  
 for(int index=0;index<MAX_KEY;index++){ >~&(P_<b  
  if(hCallWnd[index]==hWnd){ Xu]h$%W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +Jw{qQR/*  
    hCallWnd[index]=NULL; P0#`anUr1  
    HotKey[index]=0; zUQe0Gc.b^  
    HotKeyMask[index]=0; XM!M%.0WS  
    bRemoved=TRUE; "]<}Hy  
    KeyCount--; F"BL #g66  
    break; nO_!:6o".  
   } 6F ;Or  
  } 7)PJ:4IqS  
 } K`gc 4:A  
 return bRemoved; n!?r }n8  
} uo 4xnzc  
P!>g7X  
void VerifyWindow() i puo}  
{  QT_^M1%  
 for(int i=0;i<MAX_KEY;i++){ L<E/,IdE  
  if(hCallWnd!=NULL){ QRagz, c  
   if(!IsWindow(hCallWnd)){ cKpQr7]ur  
    hCallWnd=NULL; ! OfO:L7-  
    HotKey=0; <{ # <5 8  
    HotKeyMask=0; gUb "3g0  
    KeyCount--; +U=KXv  
   } 2$DSBQEx  
  } ?1$\pq^  
 } Re\o v x9  
} AgCs;k&IG  
 h.D^1  
BOOL CHookApp::InitInstance() 5C65v:Q`N  
{ `r9^:TMN  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /=- h:0{M  
 hins=AfxGetInstanceHandle(); 7H?! RYrx  
 InitHotkey(); @aUZ#,(<  
 return CWinApp::InitInstance(); Hq-v@@0 *  
} _]_LF[  
O E]~@eU  
int CHookApp::ExitInstance() (Otur  
{ XJ _%!  
 VerifyWindow(); _&=9Ke  
 UnInit(); ?qIGQ/af&  
 return CWinApp::ExitInstance(); r=|vad$  
} $ JuLAqq  
3} l;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Upu%.[7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {YfYIt=.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;wp W2%&  
#if _MSC_VER > 1000 w[|y0jtw  
#pragma once i'9e K O  
#endif // _MSC_VER > 1000 |})rt5|f1!  
%"{?[!C ?  
class CCaptureDlg : public CDialog )y5iH){ !  
{ [!5l0{0  
 // Construction ]KzJ u`O%G  
 public: OY$7`8M[  
  BOOL bTray; A03I-^0g+  
  BOOL bRegistered; $F<%Jl7_Z  
  BOOL RegisterHotkey(); zab w!@]  
  UCHAR cKey; t<8z08  
  UCHAR cMask; v)TUg0U=,  
  void DeleteIcon(); (1OW6xtfG  
  void AddIcon(); tYF$#Nor#k  
  UINT nCount; }`?7\\6  
  void SaveBmp(); EC0zH#N  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7ucx6J]c  
  // Dialog Data 6_x}.bkIx=  
  //{{AFX_DATA(CCaptureDlg) ^"PfDTyA  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8a_ UxB  
  CComboBox m_Key; 3#7ENV`  
  BOOL m_bControl; `e4o1 *  
  BOOL m_bAlt; Jx)~kK  
  BOOL m_bShift; 6hR^qdHg  
  CString m_Path; I=Gr^\x=  
  CString m_Number; X^u4%O['  
  //}}AFX_DATA uv?8V@x2  
  // ClassWizard generated virtual function overrides &E} I  
  //{{AFX_VIRTUAL(CCaptureDlg) +qE,<c}}  
 public: 2(@LRl>:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); y^5T/M  
 protected: B:B0p+$I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -Y5YCY!`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); g/fp45s  
  //}}AFX_VIRTUAL OaX HJ^k  
  // Implementation Krt$=:m|1  
 protected: o6`Y7,]  
  HICON m_hIcon; ^Tb}]aHg  
  // Generated message map functions 3'|Uqf8  
  //{{AFX_MSG(CCaptureDlg) 9/@FADh  
  virtual BOOL OnInitDialog(); LG"BfYy6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); gPF}aaB6  
  afx_msg void OnPaint(); )*q7pO\cty  
  afx_msg HCURSOR OnQueryDragIcon(); a/wUeW  
  virtual void OnCancel(); F(?Fz8  
  afx_msg void OnAbout(); OqAh4qa,$  
  afx_msg void OnBrowse(); W)G2Cs?p  
  afx_msg void OnChange(); `</=AY>  
 //}}AFX_MSG N>W;0u!  
 DECLARE_MESSAGE_MAP() 1R^XWAb  
}; a>;3 j  
#endif }.fZy&_  
N2+mN0k;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wR 5\^[GN  
#include "stdafx.h" C}M0XW  
#include "Capture.h" ^VM"!O;h{  
#include "CaptureDlg.h" ^?sSsH z  
#include <windowsx.h> !3b|*].B  
#pragma comment(lib,"hook.lib") KNO*)\   
#ifdef _DEBUG L@d]RMNv  
#define new DEBUG_NEW wI1M0@}PV  
#undef THIS_FILE .P |+oYT&g  
static char THIS_FILE[] = __FILE__; k8Su/U  
#endif !>a&`j2:W  
#define IDM_SHELL WM_USER+1 {y+v-v/#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !.tL"U~4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y4)ZUv,}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #Of<1  
class CAboutDlg : public CDialog p3,(*eZ  
{ eE#81]'6a  
 public: l"~h1xk~  
  CAboutDlg(); }5fI*v  
  // Dialog Data /jK17}j  
  //{{AFX_DATA(CAboutDlg) z$8e6*  
  enum { IDD = IDD_ABOUTBOX }; F| ,Vw{  
  //}}AFX_DATA O;&yA<  
  // ClassWizard generated virtual function overrides lyOrM7Gs  
  //{{AFX_VIRTUAL(CAboutDlg) z</XnN  
 protected: ]/<Qn-BbU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V fE^g\Ia  
  //}}AFX_VIRTUAL K_<lO,[S  
  // Implementation g O\f:Pg  
 protected: ]VHdE_7)  
  //{{AFX_MSG(CAboutDlg) LNyL>VHkK  
  //}}AFX_MSG :`Zl\!]E`o  
  DECLARE_MESSAGE_MAP() /%}YuN  
}; ^c[CyZ:a  
&a2V-|G',  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #IL~0t  
{ wzLiVe-  
 //{{AFX_DATA_INIT(CAboutDlg) &s6(3k  
 //}}AFX_DATA_INIT .@/z-OgXg  
} oN1wrf}Sh  
Do[ F+Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a s<q  
{ 40l#'< y;  
 CDialog::DoDataExchange(pDX); |]]pHC_/W  
 //{{AFX_DATA_MAP(CAboutDlg) 2}xFv2X  
 //}}AFX_DATA_MAP !tFU9Zt  
} w3]0 !) t1  
[#3Cg%V  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {]/Jk07  
 //{{AFX_MSG_MAP(CAboutDlg) oRJP5Y5na  
 // No message handlers xz Gsfd  
 //}}AFX_MSG_MAP W<Vzd4hR  
END_MESSAGE_MAP() 7gR;   
dO4U9{+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,*}g r  
: CDialog(CCaptureDlg::IDD, pParent) w$_'xX(  
{ X-2S*L'  
 //{{AFX_DATA_INIT(CCaptureDlg) 9|kEq>d  
  m_bControl = FALSE; ?D$b%G{  
  m_bAlt = FALSE; s%TO(vT  
  m_bShift = FALSE; !^"!fuoNC  
  m_Path = _T("c:\\"); ]@<3 6ByM  
  m_Number = _T("0 picture captured."); da86Jj=k  
  nCount=0; $nd-[xV  
  bRegistered=FALSE; GzZ|T7fm  
  bTray=FALSE; RT+30Q?  
 //}}AFX_DATA_INIT 'r?HL;,q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 I>4Tbwy.-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pfn#~gC_=  
} Vwh&^{Eh  
m=y,_Pz>U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $v}8lBCr3  
{ 4;~lpty  
 CDialog::DoDataExchange(pDX); L4A/7Ep  
 //{{AFX_DATA_MAP(CCaptureDlg) (LvOsr~  
  DDX_Control(pDX, IDC_KEY, m_Key); X|n[9h:%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :>-sITeY  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !m O] zn  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [F-u'h< *l  
  DDX_Text(pDX, IDC_PATH, m_Path); &8YI)G%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =`.5b:e  
 //}}AFX_DATA_MAP DBh/V#* D  
} BHBT=,sI  
K}*p(1$u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) LVcy.kU@]  
//{{AFX_MSG_MAP(CCaptureDlg) xp;8p94   
 ON_WM_SYSCOMMAND() aKU8" 5  
 ON_WM_PAINT() ZYt"=\_  
 ON_WM_QUERYDRAGICON() DBrzw+;e3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) &l}xBQAL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T7Qd I[K%b  
 ON_BN_CLICKED(ID_CHANGE, OnChange) X%\6V;zR#  
//}}AFX_MSG_MAP 8P y_Y>  
END_MESSAGE_MAP() DdZ_2B2  
`YU:kj<6  
BOOL CCaptureDlg::OnInitDialog() .$}zw|,q  
{ FZ.Yn   
 CDialog::OnInitDialog(); !rmo*-=^=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T[9jTO?W2  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2i'-lM=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]be2jQx3  
 if (pSysMenu != NULL) \c^jaK5  
 { O NzdCgY  
  CString strAboutMenu; kk./-G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %1d6j<7  
  if (!strAboutMenu.IsEmpty()) Gg,k  
  { {_N(S]Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4)Wzj4qW  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0+`*8G)  
  } $,v+i -  
 } Z42Suy  
 SetIcon(m_hIcon, TRUE); // Set big icon r\- k/0  
 SetIcon(m_hIcon, FALSE); // Set small icon T1W9@9,s  
 m_Key.SetCurSel(0); vh.tk^&  
 RegisterHotkey(); "YU~QOGx@  
 CMenu* pMenu=GetSystemMenu(FALSE); [?o v J  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {'bkU9+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); TZ_'nB~  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); QL!+.y%  
 return TRUE; // return TRUE unless you set the focus to a control ;xC~{O  
} HQj4h]O#  
a_MnQ@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) QF6JZQh<  
{ F&j|Y>m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) p" W0$t.  
 { z`{zqP:  
  CAboutDlg dlgAbout; gM[ J'DMW  
  dlgAbout.DoModal(); otVdx&%]  
 } ,colGth 54  
 else ~g|0uO}.  
 { B{7/A[$%C  
  CDialog::OnSysCommand(nID, lParam); 5Jd {Ev  
 } W 9MZ  
} m&c(N  
Olh-(u:9+O  
void CCaptureDlg::OnPaint() mK&9p{4#U  
{ 6HQwL\r79  
 if (IsIconic()) A{T@O5ucj  
 { m|gd9m $,?  
  CPaintDC dc(this); // device context for painting JJ06f~Iw[  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `r$WInsDu  
  // Center icon in client rectangle UoT}m^ G  
  int cxIcon = GetSystemMetrics(SM_CXICON); ITPp T  
  int cyIcon = GetSystemMetrics(SM_CYICON); {/!"}{G1e  
  CRect rect; ]Y! Vyn  
  GetClientRect(&rect); #$T"QL@  
  int x = (rect.Width() - cxIcon + 1) / 2; md LJ,w?{  
  int y = (rect.Height() - cyIcon + 1) / 2; >5W"a?(  
  // Draw the icon L 'Rapu  
  dc.DrawIcon(x, y, m_hIcon); 1caod0gor  
 } [m&ZAq  
 else PX/0  jv  
 { ?2>v5p  
  CDialog::OnPaint(); .Sw'Bo!Ee  
 } =xP{f<`   
} .Q@'Ob`  
nOzT Hg8  
HCURSOR CCaptureDlg::OnQueryDragIcon() |H@p^.;  
{ glIIJ5d|,  
 return (HCURSOR) m_hIcon; IcA~f@  
} eZ$1|Sj]j  
cYS+XBz  
void CCaptureDlg::OnCancel() eR;0pWVl  
{ ?MB nnyo6  
 if(bTray) sUMn (@r  
  DeleteIcon(); ^C T}i'  
  CDialog::OnCancel(); 8nR,GW\  
} P#oV ^  
{Oszq(A  
void CCaptureDlg::OnAbout() >:|q J$J.  
{ rJj~cPwL"  
 CAboutDlg dlg; Rj= Om  
 dlg.DoModal(); 8"^TWzg}L  
} feHAZ.8rp+  
6%1o<{(%f  
void CCaptureDlg::OnBrowse() RjHpC7b*%  
{ Jx?>1q=M  
 CString str; W<l(C!{  
 BROWSEINFO bi; brot&S2P><  
 char name[MAX_PATH]; JFdzA  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Okc*)crw  
 bi.hwndOwner=GetSafeHwnd(); NDG Bvb  
 bi.pszDisplayName=name; ywte \}  
 bi.lpszTitle="Select folder"; zf u78  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ry3 f'gx  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Ba~Iy2\x  
 if(idl==NULL) Wno5B/V  
  return; A>yIH)b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D3ad2vH  
 str.ReleaseBuffer(); `;@4f |N9  
 m_Path=str; nsk 6a  
 if(str.GetAt(str.GetLength()-1)!='\\') E~^'w.1  
  m_Path+="\\"; A4h/oMis  
 UpdateData(FALSE); TaG-^bX8B  
} q5PYc.E([  
n Lb 9$&  
void CCaptureDlg::SaveBmp() Y?cw9uYB  
{ fO nvC*  
 CDC dc; ]+P &Y:   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +6atbbe}   
 CBitmap bm; 6Tnzg`0I  
 int Width=GetSystemMetrics(SM_CXSCREEN); t;3.;  
 int Height=GetSystemMetrics(SM_CYSCREEN); R3A^VE;qP  
 bm.CreateCompatibleBitmap(&dc,Width,Height); g!ww;_  
 CDC tdc; :_*Q IyW  
 tdc.CreateCompatibleDC(&dc); ,jmG!qJb  
 CBitmap*pOld=tdc.SelectObject(&bm); ^cm^JyS)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !4:,,!T  
 tdc.SelectObject(pOld); v!Z9T  
 BITMAP btm; $(U|JR@  
 bm.GetBitmap(&btm); ): 6d_g{2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8vK&d>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h;->i]  
 BITMAPINFOHEADER bih; D2bUSRrb  
 bih.biBitCount=btm.bmBitsPixel; k9n93I|Cm  
 bih.biClrImportant=0; Ay]5GA!W+  
 bih.biClrUsed=0; {W]jVh p  
 bih.biCompression=0; hr5)$qZW  
 bih.biHeight=btm.bmHeight; d/1XL[&  
 bih.biPlanes=1; \"SI-`x  
 bih.biSize=sizeof(BITMAPINFOHEADER); ,v"A}g0"  
 bih.biSizeImage=size; }MNm>3  
 bih.biWidth=btm.bmWidth; (]:G"W8f  
 bih.biXPelsPerMeter=0; jkq+j^  
 bih.biYPelsPerMeter=0; Nu'rn*Y_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); uT1x\Rt|e  
 static int filecount=0; @UKd0kxPN{  
 CString name; O%r<I*T^r  
 name.Format("pict%04d.bmp",filecount++); VI?[8@*Z  
 name=m_Path+name; U:Y?2$#  
 BITMAPFILEHEADER bfh; t`  Sh!e  
 bfh.bfReserved1=bfh.bfReserved2=0; {#vo^& B  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?U |lZ~o  
 bfh.bfSize=54+size; 3r\QLIr L8  
 bfh.bfOffBits=54; b}fH$.V@  
 CFile bf; .qZ<ROZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mS0W@#|K  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Oe$C5KA>LW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $Ix^Rm9c  
  bf.WriteHuge(lpData,size); /W9=7&R0  
  bf.Close(); FB@G.f  
  nCount++; \21!NPXH2  
 } Z1Wra-g  
 GlobalFreePtr(lpData); L,i-T:Z~=  
 if(nCount==1) 1W U-gQki!  
  m_Number.Format("%d picture captured.",nCount); B-RaAiE@  
 else S7bSR?~L[  
  m_Number.Format("%d pictures captured.",nCount); r <U }lK  
  UpdateData(FALSE); }{$@|6)R   
} 9I,Trk@&  
 #u~8Txt  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aa|xZ  
{ OA_ %%A;o  
 if(pMsg -> message == WM_KEYDOWN) Cd4G&(=  
 { NunT1ved  
  if(pMsg -> wParam == VK_ESCAPE) J&Ah52  
   return TRUE; .m .v$(  
  if(pMsg -> wParam == VK_RETURN) Hxjh P(  
   return TRUE; zQ6otDZx  
 } o!Y7y1$  
 return CDialog::PreTranslateMessage(pMsg); jN'zNOV~  
} i]P]o)  
#soWX_>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N)QW$iw9  
{ s\@!J.Da  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T!8,R{V]4  
  SaveBmp(); lyP<&<Y5  
  return FALSE; KyjN'F$  
} 2gA6$s7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ OmsNo0OA  
 CMenu pop; ]'hz+V31%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `On%1%k8  
 CMenu*pMenu=pop.GetSubMenu(0); Ls( &.  
 pMenu->SetDefaultItem(ID_EXITICON); z&w@67 >j  
 CPoint pt; $. Ih-  
 GetCursorPos(&pt); GujmBb  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LqNsQu";  
 if(id==ID_EXITICON) 4h-tR  
  DeleteIcon(); {$Qw]?Yv  
 else if(id==ID_EXIT) " 5=Gu1  
  OnCancel(); ~OXPn9qPp  
 return FALSE; Mp}U>+8  
} }5EvBEv-)  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1jDN=hIl  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `2G 0B@  
 AddIcon(); 04o(05K  
 return res; Q/I/>6M7UZ  
} 5LR k)@t  
W;Ct[Y 8m  
void CCaptureDlg::AddIcon() Nzf tc  
{ n&Bgpt~  
 NOTIFYICONDATA data; BKi@c\Wb  
 data.cbSize=sizeof(NOTIFYICONDATA); wZ0RI{)s'  
 CString tip; 1 Qln|b8<  
 tip.LoadString(IDS_ICONTIP); Kqm2TMO]>V  
 data.hIcon=GetIcon(0); ) vn {?Ulj  
 data.hWnd=GetSafeHwnd(); 9!; /+P  
 strcpy(data.szTip,tip); G .NGS%v  
 data.uCallbackMessage=IDM_SHELL; \I (g70  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~ 6DaM!  
 data.uID=98; ,N93H3(  
 Shell_NotifyIcon(NIM_ADD,&data); ew?4;  
 ShowWindow(SW_HIDE); ~wvu7  
 bTray=TRUE; Q\rf J||  
} Q WcQtM  
f?W_/daP  
void CCaptureDlg::DeleteIcon() %vUY|3G  
{ pLSh +*F  
 NOTIFYICONDATA data; gamE^Ee  
 data.cbSize=sizeof(NOTIFYICONDATA); c^3,e/H  
 data.hWnd=GetSafeHwnd(); g-?@a  
 data.uID=98; z9Z4MXl  
 Shell_NotifyIcon(NIM_DELETE,&data); >jz9o9?8  
 ShowWindow(SW_SHOW); $O3.ex V  
 SetForegroundWindow(); Y O&@  
 ShowWindow(SW_SHOWNORMAL); pmRm&VgE.  
 bTray=FALSE; S#kYPe  
} (1 (~r"4I  
gu|=uW K  
void CCaptureDlg::OnChange() (@m/j2z  
{ H-\Ym}BGu  
 RegisterHotkey(); !#d5hjoX  
} &+ "<ia(  
`R;i1/  
BOOL CCaptureDlg::RegisterHotkey() L I*=T   
{ o%7-<\qS  
 UpdateData(); Jr5dw=B gw  
 UCHAR mask=0; DSQ2|{   
 UCHAR key=0; 9TX2h0U?  
 if(m_bControl)  LAkBf  
  mask|=4; PriLV4?  
 if(m_bAlt) @Bds0t  
  mask|=2; IdqCk0lVD  
 if(m_bShift) j"K^zh  
  mask|=1; C#-HWoSi  
  key=Key_Table[m_Key.GetCurSel()]; }{y)a<`  
 if(bRegistered){ EHN(K-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); OClG dFJ|  
  bRegistered=FALSE; 'Lq+ONX5  
 }  & .0A%  
 cMask=mask; {0~\T[qm  
 cKey=key; 4sRM" w;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fV@ [S  
 return bRegistered; z%S$~^=b  
} `JO>g=,4  
DQ(0:r  
  四、小结 7Xx3s@  
n]df)a  
  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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