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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: `K^j:fE7n  
  xfyUT^  
  一、实现方法 ~Uz1()ftz  
#I(Ho:b  
  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: JM-rz#;1  
M(_1'2  
#pragma data_seg("shareddata") WKB8k-.]ww  
HHOOK hHook =NULL; //钩子句柄 [Q=NGHB1/  
UINT nHookCount =0; //挂接的程序数目 7u9!:}Tu  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j>70AE3[8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dLs40 -R  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rcWr0q  
static int KeyCount =0; &>. w*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5#SD$^  
#pragma data_seg() (t\ F>A  
$Jt+>.44  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 SqF9#&F  
s$s]D\N  
  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: fq"<=  
B.-1wZl  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E4nj*Lp~+  
cKey,UCHAR cMask) `f9I#B  
{ zu~E}  
 BOOL bAdded=FALSE; x3JX}yCX  
 for(int index=0;index<MAX_KEY;index++){ E9L)dMZSpj  
  if(hCallWnd[index]==0){   vZQ'  
   hCallWnd[index]=hWnd; h* to%N  
   HotKey[index]=cKey; ~HH#aXh*  
   HotKeyMask[index]=cMask; ;be2sTo  
   bAdded=TRUE; wlM"Zt  
   KeyCount++; QQ5G?E  
   break; x[,HK{U|t  
  } lUR7zrwJ]o  
 } Q9`}dYf.  
 return bAdded; BihXYux*  
} BmRk|b  
//删除热键 p)$DpNL% p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L;7x2&  
{ q5irKT*Hs  
 BOOL bRemoved=FALSE; ]0VjVU-  
 for(int index=0;index<MAX_KEY;index++){ Ig hd,G-  
  if(hCallWnd[index]==hWnd){ ~ cKmf]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q)7iu  
    hCallWnd[index]=NULL; f\ wP}c'  
    HotKey[index]=0; dJZMzn  
    HotKeyMask[index]=0; R(?g+:eCpM  
    bRemoved=TRUE; w+P?JR!)+  
    KeyCount--; uIG,2u,  
    break; Qz+hS\yx  
   } C>d_a;pX  
  } [f'V pId8  
 } c&1:H1#  
 return bRemoved; `Ns$HV  
} 6iiH+Nc  
XNwZSW  
X  8V^  
  DLL中的钩子函数如下: ~mqiXr8  
?I6us X9$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nMK,g>wp  
{ e5!LbsJv  
 BOOL bProcessed=FALSE; TwlrncK*  
 if(HC_ACTION==nCode) t,mD{ENm&  
 { q;dg,Om  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  Pa .D+  
   switch(wParam) cr{;gP  
   {  ##gq{hgjb$  
    case VK_MENU: #S57SD  
     MaskBits&=~ALTBIT; Oy :;v7  
     break; Pg]&^d&$  
    case VK_CONTROL: @S/jVXA  
     MaskBits&=~CTRLBIT; CS;bm `8a  
     break; 3d qj:4[f  
    case VK_SHIFT: ^f:oKKaAW;  
     MaskBits&=~SHIFTBIT; R^`#xQ  
     break; mHqw,28}  
    default: //judge the key and send message 'N?,UtG R  
     break; sx;7  
   } b~khb!]  
   for(int index=0;index<MAX_KEY;index++){ >4gGb)  
    if(hCallWnd[index]==NULL) _raj b1!  
     continue; #$&!)13  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qNI2+<u)j  
    { xn49[T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -r%3"C=m  
     bProcessed=TRUE; sb"etc`w%-  
    } 0v%ZKvSID  
   } v(+9&  
  } A %iZ_h^  
  else if((lParam&0xc000ffff)==1){ //有键按下 xXpeo_y'  
   switch(wParam) (^fiw%#  
   { `GsFvxz  
    case VK_MENU: '.jr" 3u  
     MaskBits|=ALTBIT; F ] e]  
     break; x>5"7MR`  
    case VK_CONTROL: P&Vqr  
     MaskBits|=CTRLBIT; fiuF!<#;6  
     break; O s*B%,}  
    case VK_SHIFT: ' +6H=Qn  
     MaskBits|=SHIFTBIT; )/BI :)  
     break; %SW"{GnO ^  
    default: //judge the key and send message %:bTOw[4r  
     break; Q;]g9T[)  
   } 0/7y&-/(  
   for(int index=0;index<MAX_KEY;index++){ @D<q=:k  
    if(hCallWnd[index]==NULL) zKycd*X  
     continue; %E\&9,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8!a6)Zeux  
    { Jx# r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &/K:zWk3mx  
     bProcessed=TRUE; 6#egy|("nF  
    } }}AooziH9  
   } CRK%%;=>  
  } X2avo|6e  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 m&EJ @,H  
   for(int index=0;index<MAX_KEY;index++){ pkd#SY  
    if(hCallWnd[index]==NULL) m_{?py@tZ  
     continue; QLx]%E\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5r;M61  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uWs5 +  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m'|{AjH z6  
   } yDwG,)m 4s  
  } 9EryHV|  
 } ES~ykE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u`Ew^-">  
} Y9h~ hD  
4%h@K(iN  
  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: Q fI =  
dA;f`Bi;Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i3T]<&+j5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v!oXcHK/  
o $k1&hyH  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: o<\CA[   
/\=syl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X@$x(Zc  
{ hhu !'(j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) P{ AJH1  
 { 9v_B$F$_T  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'je=.{[lWt  
  SaveBmp(); l1X& Nw1W  
  return FALSE; : b^\O  
 } 1b)^5U ;  
 …… //其它处理及默认处理 ]AlRu(  
} <a@'Pcsk  
VH&6Tm1  
]=5nC)|  
  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。 YN Lc )  
$<jI<vD+:  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 )*[3Imq/  
=;(wBj  
  二、编程步骤 v1 h*/#  
n GE3O#fv  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 4%#C _pE9  
5Qb%g )jZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5;=,BWU  
Q`#Y_N-h+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; O9>& E;`5  
ADoxma@  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; o,a 3J:j]  
~2Jvb[IM  
  5、 添加代码,编译运行程序。 _1w?nN'  
HhfuHZ<  
三、程序代码 {9wBb`.n^  
:( A5 ,$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL f]F]wg\_f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /JPyADi  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }5#<`8  
#if _MSC_VER > 1000 't3/< h<  
#pragma once K9Dxb  
#endif // _MSC_VER > 1000 a%Ky;ys  
#ifndef __AFXWIN_H__ .Y.\D\>~  
#error include 'stdafx.h' before including this file for PCH "y@B|  
#endif Q>s>@hw  
#include "resource.h" // main symbols )ymd#?wq  
class CHookApp : public CWinApp _iBNy   
{ CA[-\>J7y  
 public: h amn9  
  CHookApp(); pNFL;k+p}  
  // Overrides nU$;W  
  // ClassWizard generated virtual function overrides =>".  
  //{{AFX_VIRTUAL(CHookApp) Mfjj+P  
 public: &-#!]T-P:E  
  virtual BOOL InitInstance(); 9I*zgM!F  
  virtual int ExitInstance(); mx  s=<  
  //}}AFX_VIRTUAL wPTXRq%  
  //{{AFX_MSG(CHookApp) a5o&6_  
  // NOTE - the ClassWizard will add and remove member functions here. @2sr/gX^  
  // DO NOT EDIT what you see in these blocks of generated code ! s0'6r$xj  
  //}}AFX_MSG v!#koqd1y.  
  DECLARE_MESSAGE_MAP() 2]Ei4%jo  
}; 2tS,q_-=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \)cbg#v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MADt$_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~BgNM O;|  
BOOL InitHotkey(); \"P$*y4Le  
BOOL UnInit(); >vDi,qmZ  
#endif lr=quWDY  
C|RC9b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. d~y]7h|  
#include "stdafx.h" !T.yv5ge'  
#include "hook.h" /5~j"| U'  
#include <windowsx.h> ,vB nr_D#  
#ifdef _DEBUG T/tCX[}  
#define new DEBUG_NEW juMHc$d17  
#undef THIS_FILE < Q6  
static char THIS_FILE[] = __FILE__; {w ]L'0ES[  
#endif j|VX6U   
#define MAX_KEY 100 (R!`Z%  
#define CTRLBIT 0x04 Z& bIjp  
#define ALTBIT 0x02 2 ;Q|h$ n  
#define SHIFTBIT 0x01 ;oOv~ YB7H  
#pragma data_seg("shareddata") ooj^Z%9P  
HHOOK hHook =NULL; [@0Hmd7  
UINT nHookCount =0; 5KW n>n  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey #yOeL3|b'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <o@__l.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -pQ0,/}K  
static int KeyCount =0; (]$&.gE.F  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift |9mGX9q  
#pragma data_seg() 9L>ep&u)^  
HINSTANCE hins; ~zFwSF  
void VerifyWindow(); b7HT<$Wg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) US&:UzI.  
//{{AFX_MSG_MAP(CHookApp) |al'_s}I  
// NOTE - the ClassWizard will add and remove mapping macros here. *a` _,Q{x  
// DO NOT EDIT what you see in these blocks of generated code! y7LM}dH#m  
//}}AFX_MSG_MAP uP1]EA  
END_MESSAGE_MAP() e*39/B0S  
zI_pP?4;.q  
CHookApp::CHookApp() Pk^V6-  
{ tw<}7l_>Au  
 // TODO: add construction code here, 7 ;x to =  
 // Place all significant initialization in InitInstance UC!"1)~mt`  
} BUXlHh%<R  
GX N:=  
CHookApp theApp; "S psSQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }KV)F,`  
{ ki]i[cdk  
 BOOL bProcessed=FALSE; WISeP\:^  
 if(HC_ACTION==nCode) #3YYE5cB  
 { _:G>bU/^  
  if((lParam&0xc0000000)==0xc0000000){// Key up [-1Yyy1}  
   switch(wParam) $~T|v7Y%  
   { 6W)#F O`  
    case VK_MENU: ]u%Y8kBe  
     MaskBits&=~ALTBIT; `W u.wx  
     break; MwWN;_#EO)  
    case VK_CONTROL: LP} j0)n  
     MaskBits&=~CTRLBIT; OJs s  
     break; /%P,y+<}iG  
    case VK_SHIFT: 2~@Cj@P]  
     MaskBits&=~SHIFTBIT;  R'aA\k-  
     break; _x<7^^VT  
    default: //judge the key and send message /+f3jy:d  
     break; m!:sDQn{3  
   } La si)e=$<  
   for(int index=0;index<MAX_KEY;index++){ ?8$h%Ov-  
    if(hCallWnd[index]==NULL) SOvo%L@  
     continue; q`@8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u@kr;^m  
    { 27UnH: =  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3NrWt2?  
     bProcessed=TRUE; -aIB_  
    } 0y=lf+xA*  
   } ! p3vnOX6  
  } {Pe+d3Eoo  
  else if((lParam&0xc000ffff)==1){ //Key down fCi1JH;  
   switch(wParam) 3Oe\l[?$;  
   { TL([hR _  
    case VK_MENU: CK1gzIg>  
     MaskBits|=ALTBIT; UvVq#<-  
     break; Ai5D[ykX  
    case VK_CONTROL: mA6Nmq%{ F  
     MaskBits|=CTRLBIT; T$4Utd5[z'  
     break; tN&X1  
    case VK_SHIFT: tnC,1HV0[  
     MaskBits|=SHIFTBIT; 2$?j'i!  
     break; G":u::hR  
    default: //judge the key and send message qr?RU .W  
     break; r#WAS2.TP  
   } >FReGiK$T  
   for(int index=0;index<MAX_KEY;index++) p}h9>R  
   { ,%,.c^-  
    if(hCallWnd[index]==NULL) (?~*.g!  
     continue; >w|2 ~oK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $($SQZK&  
    { H\k5B_3OU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $ vjmW! O  
     bProcessed=TRUE; ^"l$p,P+  
    } J9 =gv0  
   } JgB# EoF  
  } J7_H.RPa  
  if(!bProcessed){ JJ~?ON.H  
   for(int index=0;index<MAX_KEY;index++){ HxMsH5;  
    if(hCallWnd[index]==NULL) ,![=_d  
     continue; 'MUrszOO.e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $a A.d^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); dvD<>{U,8  
   } `aUp&8{  
  } <C$<(Dw5  
 } X u_<4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Rpk`fxAO  
} eC$v0Gtq  
K|G $s  
BOOL InitHotkey() *jK))|%  
{ YP<]f>SBt  
 if(hHook!=NULL){  {K9E% ,w  
  nHookCount++; #FB>}:L{h*  
  return TRUE; m=MT`-:  
 } vy@Lu cB  
 else rl%Kn^JJ~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); TyWy5J< :+  
  if(hHook!=NULL) (g m^o{  
   nHookCount++; v)yimIHzo  
  return (hHook!=NULL); "Cc"y* P  
} :*@|"4  
BOOL UnInit() ge?-^s4M  
{ ? sW`**j  
 if(nHookCount>1){ =BS'oBn^6  
  nHookCount--; ?Q)Z..7  
  return TRUE; ~It+|X=Kx  
 } }qv-lO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); uAs*{:4n  
 if(unhooked==TRUE){ ~{YgM/c|dt  
  nHookCount=0; f#kevf9zc  
  hHook=NULL; 9yo[T(8  
 } !>y}Xq{bm3  
 return unhooked; /Q8A"'Nk  
} `_U0>Bfg;  
Zk#i9[g9*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0Eu$-)  
{ R9/xC7l@  
 BOOL bAdded=FALSE; SP7g qM  
 for(int index=0;index<MAX_KEY;index++){ %C6zXiO"  
  if(hCallWnd[index]==0){ 'Y{ux>  
   hCallWnd[index]=hWnd; `$Flgp0P  
   HotKey[index]=cKey; ?VZXJO{^  
   HotKeyMask[index]=cMask; R}X_2""  
   bAdded=TRUE; B"8JFf}"q  
   KeyCount++; 8N* -2/P&  
   break; 0 ,Qj:  
  } d<GG (  
 } Gx_`|I{P  
 return bAdded; 3b)T}g  
} s.`%ZDl@Y  
|z|)r"*\4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #1dTM-  
{ -)a_ub  
 BOOL bRemoved=FALSE; QjjJtKz  
 for(int index=0;index<MAX_KEY;index++){ CDwIq>0j  
  if(hCallWnd[index]==hWnd){ 2PP-0 E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yCkW2p]s,K  
    hCallWnd[index]=NULL; B,vHn2W  
    HotKey[index]=0; oj(A`[  
    HotKeyMask[index]=0; <x0uO  
    bRemoved=TRUE; JIbzh?$aD  
    KeyCount--; N<Z)b!o%u  
    break; l`FR.)2h  
   } C*y6~AYN#  
  } *VC4s`<  
 } ;TV'PJ  
 return bRemoved; G9'YgW+$7  
} J'&B:PZObB  
H&yFSz}6a  
void VerifyWindow() Fe& n,  
{ \p@nH%@v  
 for(int i=0;i<MAX_KEY;i++){ ^tg6JB;s  
  if(hCallWnd!=NULL){ uU[[[LQq  
   if(!IsWindow(hCallWnd)){ h*\TCl)  
    hCallWnd=NULL; ^{fi^lL=  
    HotKey=0; 9B#)h)h(=  
    HotKeyMask=0; 'x45E.wYw  
    KeyCount--; #}t 1   
   } Ic{'H2~4,  
  } C;)Xwm>e  
 } J psPNa  
} OGl$W>w1  
`n$5+a+  
BOOL CHookApp::InitInstance() ?4H i-  
{ AU-n&uX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); w =. Fj  
 hins=AfxGetInstanceHandle(); xss`Y,5?  
 InitHotkey(); z1^gDjkZ  
 return CWinApp::InitInstance(); /Uo y/}!  
} "#(T  
>``MR%E:<  
int CHookApp::ExitInstance() GA7}K:LP'k  
{ v1a6?-  
 VerifyWindow(); G$ _yy:  
 UnInit(); hs tbz  
 return CWinApp::ExitInstance(); Or !+._3i  
} f!O{%ev  
Sz H"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GnP|x}YM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) D#&q&6P{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ooUk O  
#if _MSC_VER > 1000 sP^R/z|Y  
#pragma once 5jUYN-$GO  
#endif // _MSC_VER > 1000 Gs3LB/8?  
)T;?^kho  
class CCaptureDlg : public CDialog [o F|s-"9!  
{ ~I{n^Q/a  
 // Construction h6} lpd  
 public: 5Ri6Z#qm  
  BOOL bTray; _E@ :O+K  
  BOOL bRegistered; EvOJ~'2 Y%  
  BOOL RegisterHotkey(); SJIOI@\b  
  UCHAR cKey; R'S0 zp6  
  UCHAR cMask; sg+uBCGB  
  void DeleteIcon(); -eX5z  
  void AddIcon(); <!pY$  
  UINT nCount; 26xXl|I  
  void SaveBmp(); It{;SKeo  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =zyC-;r!  
  // Dialog Data dDF .qXq.  
  //{{AFX_DATA(CCaptureDlg) C`5  
  enum { IDD = IDD_CAPTURE_DIALOG }; :>+s0~  
  CComboBox m_Key; +|tC'gCnV  
  BOOL m_bControl; |Pg@M  
  BOOL m_bAlt; Uh][@35 p  
  BOOL m_bShift;  Br` IW  
  CString m_Path; 8>7& E-  
  CString m_Number; 9'r:~ O  
  //}}AFX_DATA zA[0mkC?$  
  // ClassWizard generated virtual function overrides s+Q~~]HJM  
  //{{AFX_VIRTUAL(CCaptureDlg) %Qj;,#z  
 public: vsa92c@T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); J9=m]R8T  
 protected: # vry0i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;X?mmv'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l&[;rh  
  //}}AFX_VIRTUAL p ZZc:\fJ  
  // Implementation hXA6D)   
 protected: &8z[`JW,T  
  HICON m_hIcon; +). 0cs0k5  
  // Generated message map functions 'D @-  
  //{{AFX_MSG(CCaptureDlg) xKFn.qFr  
  virtual BOOL OnInitDialog(); r fq;%C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &\Amn?Iq  
  afx_msg void OnPaint(); Op_RzZP`  
  afx_msg HCURSOR OnQueryDragIcon(); 0C>%LJ8r  
  virtual void OnCancel(); Q_t`.jus  
  afx_msg void OnAbout(); HcqfB NM  
  afx_msg void OnBrowse(); f/V 2f].  
  afx_msg void OnChange(); LA`*_|}qcR  
 //}}AFX_MSG ##4GK08!  
 DECLARE_MESSAGE_MAP() ndeebXw*  
}; ;v$4$D]L  
#endif B` k\EL'  
A$w4PVS  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vPD] hs  
#include "stdafx.h" f{FDuIl n  
#include "Capture.h" 3Oi nK['  
#include "CaptureDlg.h" YiPoYlD*n<  
#include <windowsx.h> 3:C oZ  
#pragma comment(lib,"hook.lib") q5#J~n8Wr  
#ifdef _DEBUG qcN'e.A  
#define new DEBUG_NEW -*XCxU'  
#undef THIS_FILE D)d~3`=#  
static char THIS_FILE[] = __FILE__; B4mR9HMh  
#endif $bsG]  
#define IDM_SHELL WM_USER+1 >2Kh0rIH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PZ*pQ=`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D &/L:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iURk=*Z=  
class CAboutDlg : public CDialog 19j+lCSvH  
{ GO^_=EMR[  
 public: 2^l[(N  
  CAboutDlg(); Ba/Yl  
  // Dialog Data GPGm]Gt  
  //{{AFX_DATA(CAboutDlg) tz&y*e&  
  enum { IDD = IDD_ABOUTBOX }; .3MIcj=p  
  //}}AFX_DATA |lkNi  
  // ClassWizard generated virtual function overrides &w1P\4?G  
  //{{AFX_VIRTUAL(CAboutDlg) k+DR]icv  
 protected: ;asP4R=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !ki.t  
  //}}AFX_VIRTUAL ?IGVErnJJC  
  // Implementation XQ~Ke-QW)  
 protected: :bC40@  
  //{{AFX_MSG(CAboutDlg) Jyqc2IH  
  //}}AFX_MSG f0BdXsV#g  
  DECLARE_MESSAGE_MAP() m:/ wG& !  
}; _X'"w|0  
^tCd L@$AS  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z%x\~ )~  
{ ?2g`8[">  
 //{{AFX_DATA_INIT(CAboutDlg) V.{H9n]IO  
 //}}AFX_DATA_INIT izx#3u$P  
} @, Wvvh  
e@ \p0(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -^ C=]Medl  
{ w&%~3Cz.  
 CDialog::DoDataExchange(pDX); FSRj4e1y1  
 //{{AFX_DATA_MAP(CAboutDlg) G2^et$<{uU  
 //}}AFX_DATA_MAP (S v~2  
} bcZf>:gVf  
IEcf  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q pmsOp|  
 //{{AFX_MSG_MAP(CAboutDlg) =lu/9 i6  
 // No message handlers (k|_J42[  
 //}}AFX_MSG_MAP YXI'gn2b#  
END_MESSAGE_MAP() m{7(PHpw  
nw6+.pOy  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nYJTKU  
: CDialog(CCaptureDlg::IDD, pParent) "kA*Vc#  
{ ]7rj/l$ u  
 //{{AFX_DATA_INIT(CCaptureDlg) /AQMFx4-5  
  m_bControl = FALSE; ?]4>rl}  
  m_bAlt = FALSE; 0pSmj2/,.  
  m_bShift = FALSE; %/rMg"f:  
  m_Path = _T("c:\\"); &EpAg@9!  
  m_Number = _T("0 picture captured."); p^pOuy8  
  nCount=0; t>uN'oCyC  
  bRegistered=FALSE; XduV+$ 03  
  bTray=FALSE; /P 2[:[w  
 //}}AFX_DATA_INIT ai0Ut   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ts8+V<g  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |> _!eS\=<  
} h/,${,}J  
_kY#D;`:r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7^Yk`Z?|a  
{ L-9~uM3@\  
 CDialog::DoDataExchange(pDX); ZKdeB3D  
 //{{AFX_DATA_MAP(CCaptureDlg) mP(kcMT "  
  DDX_Control(pDX, IDC_KEY, m_Key); 10#f`OPC  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); NxLXm,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); XhPe]P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aceZ3U>W  
  DDX_Text(pDX, IDC_PATH, m_Path); *;XWLd#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wlPx,UqZ  
 //}}AFX_DATA_MAP |0,vQv  
} o5n^!gi4  
1LY8Ma]E  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NOS>8sy  
//{{AFX_MSG_MAP(CCaptureDlg) @K:N,@yq  
 ON_WM_SYSCOMMAND() BJS-Jy$-  
 ON_WM_PAINT() efY8M2  
 ON_WM_QUERYDRAGICON() 3! ~K^Z]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [>|FB'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @WKzX41'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1R. 4:Dn_  
//}}AFX_MSG_MAP Pe2wsR"_U  
END_MESSAGE_MAP() :ZDMNhUl &  
|0z;K:5s  
BOOL CCaptureDlg::OnInitDialog() 7_# 1Ec|;  
{ {>bW>RO)  
 CDialog::OnInitDialog(); wJlX4cT4YV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \sA*V%n  
 ASSERT(IDM_ABOUTBOX < 0xF000); $M:3XAN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); iL7VFo:Q  
 if (pSysMenu != NULL) F6hmku>\1  
 { 3u33a"nL8  
  CString strAboutMenu; :3$}^uzIq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); -xD*tf*  
  if (!strAboutMenu.IsEmpty()) $Q+s/4\  
  { >b.^kc  
   pSysMenu->AppendMenu(MF_SEPARATOR); J`*iZvW#Bx  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lHB) b}7E  
  } KTEZ4K^o=  
 } (3dPLp:K  
 SetIcon(m_hIcon, TRUE); // Set big icon #;# 3%?  
 SetIcon(m_hIcon, FALSE); // Set small icon UMN*]_'+;b  
 m_Key.SetCurSel(0); n,O5".aa<  
 RegisterHotkey(); |3? 8)z\n  
 CMenu* pMenu=GetSystemMenu(FALSE); bqx0d=Z~[  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @uH#qg7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2-0$FQ@/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); smQVWs>  
 return TRUE; // return TRUE unless you set the focus to a control H0"=Vs,n  
} 9tg)Mo%  
Tx%VU8\?n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DDd|T;8  
{ Bf4%G,o5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u2(eaP8d  
 { /b,TpuM^  
  CAboutDlg dlgAbout; [*m2  
  dlgAbout.DoModal(); 'YSuQP>  
 } !~-6wN"k  
 else Dmdy=&G  
 { uM(UO,X  
  CDialog::OnSysCommand(nID, lParam); Z%gx%$  
 } IJU0[EA]F  
} 5 ZfP  
,,=apyr#&  
void CCaptureDlg::OnPaint() s* j fMY  
{ #NRh\Wj|  
 if (IsIconic()) X21dX`eMN  
 { w>~M}Ahj  
  CPaintDC dc(this); // device context for painting RM*f|j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rU#li0 >  
  // Center icon in client rectangle 5@u~3jPd  
  int cxIcon = GetSystemMetrics(SM_CXICON); u@.>WHQN  
  int cyIcon = GetSystemMetrics(SM_CYICON); QYThW7S  
  CRect rect; *i<\iMoW  
  GetClientRect(&rect); "2Op[~V  
  int x = (rect.Width() - cxIcon + 1) / 2; nwM)K  
  int y = (rect.Height() - cyIcon + 1) / 2; M1u{A^d.Z  
  // Draw the icon b7h+?!H]R  
  dc.DrawIcon(x, y, m_hIcon); G{c#\?12C  
 } mrZ`Lm#>pS  
 else -fIc4u[  
 { !E& MBAKy  
  CDialog::OnPaint(); b1!@v+  
 } x,Y 5U+]E  
} C}CKnkMMD  
.RRlUWu  
HCURSOR CCaptureDlg::OnQueryDragIcon() Q~ 0Dfo w?  
{ /)V4k:#b  
 return (HCURSOR) m_hIcon; uu}-"/<~7  
} yr4ou  
W (& 6  
void CCaptureDlg::OnCancel() +8^_D?*\n  
{ -i_En^Fi  
 if(bTray) ')nnWlK  
  DeleteIcon(); 8wF#e\Va0  
  CDialog::OnCancel(); \p6 }  
} &`@M8-m#F  
KU2$5[~j  
void CCaptureDlg::OnAbout() *bZ\@Qm  
{ f9'] jJ+  
 CAboutDlg dlg; !Z/$}xxj  
 dlg.DoModal(); Vj!WaN_  
} %N{sD[^  
z~.9@[LG]  
void CCaptureDlg::OnBrowse() :QKb#4/8;  
{ oEAfowXSqk  
 CString str; & s-VSu7  
 BROWSEINFO bi; k5X b}@  
 char name[MAX_PATH]; WF)s*$'uz;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); K\X: G-C9  
 bi.hwndOwner=GetSafeHwnd(); (C~dkR?  
 bi.pszDisplayName=name; m0Z7N5v)  
 bi.lpszTitle="Select folder"; ji##$xC  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [|<EDR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T?e9eYwS  
 if(idl==NULL) oeGS  
  return; ]Wy.R6  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lA4hm4"i(,  
 str.ReleaseBuffer(); 'Q`C[*c  
 m_Path=str; `5<1EGJsD  
 if(str.GetAt(str.GetLength()-1)!='\\') DvJB59:_}  
  m_Path+="\\"; uTw|Q{f  
 UpdateData(FALSE); 1 mHk =J~  
} D1! {S7  
.xnQd^qoac  
void CCaptureDlg::SaveBmp() z'e1"Y.  
{ CLktNR(45  
 CDC dc; 7%YYr^d  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kDg{ >mf  
 CBitmap bm; 1!f2*m  
 int Width=GetSystemMetrics(SM_CXSCREEN); rr)9Y][l}  
 int Height=GetSystemMetrics(SM_CYSCREEN); I1~G$)w#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); }8 \|1@09  
 CDC tdc; @92gb$xT  
 tdc.CreateCompatibleDC(&dc); (%^Bp\.02!  
 CBitmap*pOld=tdc.SelectObject(&bm); q[T='!Z\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Xh*p\ $  
 tdc.SelectObject(pOld); PN @[k:5(  
 BITMAP btm; $IB>a  
 bm.GetBitmap(&btm); Tx!c }  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; d/3 k3HdL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XkJzt  
 BITMAPINFOHEADER bih; ]'a9>o  
 bih.biBitCount=btm.bmBitsPixel; d}e/f)(  
 bih.biClrImportant=0; M.QXwIT  
 bih.biClrUsed=0; v\gCgx=%j  
 bih.biCompression=0; 0tl  
 bih.biHeight=btm.bmHeight; mDo]5 i<  
 bih.biPlanes=1; jIEK[vJ`  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2Ejs{KUj  
 bih.biSizeImage=size; |_2O:7qe  
 bih.biWidth=btm.bmWidth; wCkkfTO  
 bih.biXPelsPerMeter=0; n2T vPt\  
 bih.biYPelsPerMeter=0; S__ o#nf`%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,.E:mm  
 static int filecount=0; s=28.  
 CString name; ) I@gy  
 name.Format("pict%04d.bmp",filecount++);  EI+.Q  
 name=m_Path+name; ? Bk"3{hl  
 BITMAPFILEHEADER bfh; kR'!;}s  
 bfh.bfReserved1=bfh.bfReserved2=0; @P)GDB7A  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bk"` hq  
 bfh.bfSize=54+size; ww[STg  
 bfh.bfOffBits=54; S6K aw  
 CFile bf; |~'{ [?a*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :p OX,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zQ7SiRt7*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  #p\sw  
  bf.WriteHuge(lpData,size); 2 0hE)!A  
  bf.Close(); D<nTo&m_  
  nCount++; 7 +?  
 } V_0e/7}Ya  
 GlobalFreePtr(lpData); 3``$yWWg  
 if(nCount==1) RN!oflb  
  m_Number.Format("%d picture captured.",nCount); $yOfqr  
 else B<6*Ktc  
  m_Number.Format("%d pictures captured.",nCount); C[&L h_F\  
  UpdateData(FALSE); 0*h\/!e  
} vsLn@k3  
}1'C!]j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lHZf'P_Wx  
{ oXfLNe6>L  
 if(pMsg -> message == WM_KEYDOWN) F*hs3b0Db  
 { q"fK"H-j  
  if(pMsg -> wParam == VK_ESCAPE) zYF'XB]4  
   return TRUE; l6)*u[}E   
  if(pMsg -> wParam == VK_RETURN) DUY#RJf  
   return TRUE; =q>eoXp  
 } :* @=px  
 return CDialog::PreTranslateMessage(pMsg); ?6~RGg  
} XKMJsEP sW  
"jb?P$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U =T[-(:H  
{ RM QlciG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 82>zu}  
  SaveBmp(); qH"e: wgL  
  return FALSE; M="%NxuS  
} |PTL!>ym2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Kkdd}j  
 CMenu pop; =3""D{l  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N\ GBjr-d  
 CMenu*pMenu=pop.GetSubMenu(0); 8vc4J5  
 pMenu->SetDefaultItem(ID_EXITICON); ${mHbqN  
 CPoint pt; ;nSaZ$`5  
 GetCursorPos(&pt); .2Gn)dZU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fs7JA=?:  
 if(id==ID_EXITICON) 5-aCNAF2  
  DeleteIcon(); JFl@{6c  
 else if(id==ID_EXIT) A10/"Ec<u  
  OnCancel(); e2Ba@e-  
 return FALSE; p}O@ %*p .  
} J'Gn M?M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]r6,^"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (9@6M 8A  
 AddIcon(); f4]nz:2  
 return res; ]D%D:>9|/  
} OZ$u&>916  
\O72PC+  
void CCaptureDlg::AddIcon() Kx$?IxZ  
{ 0.bmVN<  
 NOTIFYICONDATA data; FpCj$y~3  
 data.cbSize=sizeof(NOTIFYICONDATA); X-6Se  
 CString tip; w,9$*=k  
 tip.LoadString(IDS_ICONTIP); NTls64AS.  
 data.hIcon=GetIcon(0); a'XCT@B  
 data.hWnd=GetSafeHwnd(); hH`yQGZ  
 strcpy(data.szTip,tip); phEM1",4T  
 data.uCallbackMessage=IDM_SHELL; 9akCvY#Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6HFA2~A  
 data.uID=98; enK4`+.7  
 Shell_NotifyIcon(NIM_ADD,&data); 7H++ pOF  
 ShowWindow(SW_HIDE); Z9 }qds6 y  
 bTray=TRUE; FL"IPX;S  
} ;m{[9i` 2  
c;B Q$je}  
void CCaptureDlg::DeleteIcon() 0XvMaQXQF  
{ +!'6:F  
 NOTIFYICONDATA data; J+w"{ O  
 data.cbSize=sizeof(NOTIFYICONDATA); XZJ}nXy  
 data.hWnd=GetSafeHwnd(); JwxI8Pi*y  
 data.uID=98; Jel%1'Dc^  
 Shell_NotifyIcon(NIM_DELETE,&data); ^k t#[N  
 ShowWindow(SW_SHOW); %[Ia#0'Y@  
 SetForegroundWindow(); HC+(FymV  
 ShowWindow(SW_SHOWNORMAL); #^%Rk'W  
 bTray=FALSE; ,K8PumM_  
} (~zdS.  
Eki7bT@/  
void CCaptureDlg::OnChange() Q^ bG1p//.  
{ |o|0qG@g  
 RegisterHotkey(); %~ZOQ%c1  
} gXc&uR0S  
O BF5Tl4  
BOOL CCaptureDlg::RegisterHotkey() M@ ! {m  
{ \Vr(P>  
 UpdateData(); J:5%ff~r\  
 UCHAR mask=0; ~KHp~Xs`  
 UCHAR key=0; ~Se/uL;*  
 if(m_bControl) e J2wK3R  
  mask|=4; G{YJ(6etZ  
 if(m_bAlt) .'L@$]!G  
  mask|=2; c3g\*)Jz"F  
 if(m_bShift) i,$*+2Z  
  mask|=1; &*T57tE  
  key=Key_Table[m_Key.GetCurSel()]; cQS}pQyYN  
 if(bRegistered){ `cMa Fc-y/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /J wQ5  
  bRegistered=FALSE; 7?Xfge%\  
 } mY |$=n5X  
 cMask=mask; %(,JBa:G  
 cKey=key; V: 2|l!l*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :M'3U g$t  
 return bRegistered; OI::0KOv  
} p`T7Y\\#!  
^Me__Y  
  四、小结 lH T?  
!sK{:6s  
  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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