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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: uv}[MXOP  
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  一、实现方法 pRD8/7@(B{  
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  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: @/ wJW``;  
T c4N\Cy  
#pragma data_seg("shareddata") h2zuPgz,  
HHOOK hHook =NULL; //钩子句柄 A /,7%bB1  
UINT nHookCount =0; //挂接的程序数目 jnYFA[Ab  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 hUcG3IOBf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ot]E\g+!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey A{Z=[]r1`E  
static int KeyCount =0; / ,f*IdB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 DHW;*A-  
#pragma data_seg() DT8|2"H  
>0=`3X|Y7  
  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。 tEf_XBjKV  
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  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: Q_euNoA0  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =GTltFqI1  
cKey,UCHAR cMask) GNA:|x  
{ Rgw\qOb  
 BOOL bAdded=FALSE; H*!j\|v0  
 for(int index=0;index<MAX_KEY;index++){ d%\ {,  
  if(hCallWnd[index]==0){ wLPL 9  
   hCallWnd[index]=hWnd; F"#bCnS  
   HotKey[index]=cKey; fKf5i@CvB@  
   HotKeyMask[index]=cMask; G\?fWqx  
   bAdded=TRUE; "@RLS~Ej  
   KeyCount++; a=&a)FR  
   break; j` 9pZAF  
  } '`#2'MXG  
 } ^!L'Ao y;E  
 return bAdded; Ka&[ Oz<w  
} q%w\UAqA  
//删除热键 W^i ct,t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nKp='>Th  
{ 5*xk8*  
 BOOL bRemoved=FALSE; ( YF`#v6  
 for(int index=0;index<MAX_KEY;index++){ 'xm_oGWE  
  if(hCallWnd[index]==hWnd){ SG2s!Ht  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~EG`[cv  
    hCallWnd[index]=NULL; {O*WLZ{0  
    HotKey[index]=0; "GEJ9_a[  
    HotKeyMask[index]=0; M%7{g"J*  
    bRemoved=TRUE; N0oBtGb  
    KeyCount--; t>.mB@se|  
    break;  `@b+'L  
   } ykH?;Xu  
  } Eg-3GkC  
 } B\wH`5/KW  
 return bRemoved; 7c1xB.g   
} Gy hoo'<  
r`pg`ChHv  
%<CahzYc6  
  DLL中的钩子函数如下: Wp`wIe6  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QU_O9 BN  
{ WLd{+y5#  
 BOOL bProcessed=FALSE; Fd":\7p  
 if(HC_ACTION==nCode) R"EX$Zj^E  
 { $-[V)]h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q<3=s6@T  
   switch(wParam) XZLo*C!MG  
   {  @tWyc%t  
    case VK_MENU: cJd~UQ<k  
     MaskBits&=~ALTBIT; t8DyS FT  
     break;  iUJqAi1o  
    case VK_CONTROL: {5QIQ  
     MaskBits&=~CTRLBIT; IqJ7'X  
     break; uIvy1h9m  
    case VK_SHIFT: NJ^`vWi  
     MaskBits&=~SHIFTBIT; ce{(5IC  
     break; m_\w)  
    default: //judge the key and send message S Cs@Q  
     break; T3,"g=  
   } 8Eyi`~cAiH  
   for(int index=0;index<MAX_KEY;index++){ 1O>wXq7q  
    if(hCallWnd[index]==NULL) Xp@8 vu  
     continue; A9' [x7N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fq>=0 )  
    { R5c Ya  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 47.c  
     bProcessed=TRUE; GoP,_sd\O  
    } ,)e&u1'  
   } &Ed7|k]H  
  } fCdd,,,}  
  else if((lParam&0xc000ffff)==1){ //有键按下 Kq e,p{=  
   switch(wParam) r!N)pt<g  
   { HgPRz C  
    case VK_MENU: kNP.0  
     MaskBits|=ALTBIT; |7XSC,"  
     break; j}7as&  
    case VK_CONTROL: ||a 5)D  
     MaskBits|=CTRLBIT; dqMt6b\}  
     break; pXf!8X&y  
    case VK_SHIFT: x%ju(B>  
     MaskBits|=SHIFTBIT; }CnqJ@>C5  
     break; R("g ]  
    default: //judge the key and send message SQhk)S  
     break; w DswK "T  
   } T+ey>[  
   for(int index=0;index<MAX_KEY;index++){ .}n,  
    if(hCallWnd[index]==NULL) WPi^;c8  
     continue; W iqlc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u; \:#721  
    { mX3~rK>@~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <`,pyvR Kv  
     bProcessed=TRUE; 4A^=4"BCV  
    } {U1 j@pKm  
   } >Y=HP&A<  
  } ~SgW+sDF u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 tgXIj5z  
   for(int index=0;index<MAX_KEY;index++){ {j i;~9'Q  
    if(hCallWnd[index]==NULL) i1k(3:ay<  
     continue; yQ5&S]Xk$$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W`_pjld  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qI;"yG-x-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $Y.Z>I;  
   } 7OY<*ny  
  } iU3)4(R  
 } 0vOt. LC/S  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -6a4H?L  
} b* Ny  
to{/@^ D  
  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: eQ _dO]Q  
sf )ojq6s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eAKK uML  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z0*Lm+d9z  
y57]q#k  
  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: H }w"4s  
EV{kd.=f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '{=dEEi  
{ 5N "fD{v{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) gM_z`H 5[!  
 { R\k= CoJJ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 pwo5Ij,~q  
  SaveBmp(); F F<xsoZJ  
  return FALSE; KNT(lA0s  
 } a)J3=Z-  
 …… //其它处理及默认处理 9l) .L L  
} v Yt-Nx  
7L~LpB  
EH))%LY1y  
  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。 ?w'a^+H  
fDy Fkhc  
  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。 bl@0+NiM  
59K%bz5t  
  二、编程步骤 @V{s'V   
Tdtn-  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Y@x }b{3  
jO xH' 1I  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; n5CjwLgu\b  
MG ,exN @  
  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; #?%akQ+w  
KWtLrZ(j  
  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; .w5#V|   
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  5、 添加代码,编译运行程序。 o=i)s2   
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三、程序代码 (2J_Y*N~>  
BDoL)}bRE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +~, qb1aZ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6J. [9#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ AQkH3p/W  
#if _MSC_VER > 1000 {!5"Y(>X  
#pragma once XVwaX2=L  
#endif // _MSC_VER > 1000 ga0>J_  
#ifndef __AFXWIN_H__ 7^$PauAv  
#error include 'stdafx.h' before including this file for PCH N<c98  
#endif  E~oQ%X~  
#include "resource.h" // main symbols #N%ATV  
class CHookApp : public CWinApp ]D|sQPi]F  
{ tY$ .(2Ua  
 public: "0x"X w#I  
  CHookApp(); !wH7;tU  
  // Overrides @ k+Z?Hp  
  // ClassWizard generated virtual function overrides 4T#B7wVoM  
  //{{AFX_VIRTUAL(CHookApp) P(?i>F7s  
 public: g7*cwu  
  virtual BOOL InitInstance(); q~*3Bk~  
  virtual int ExitInstance(); Mf0!-bu  
  //}}AFX_VIRTUAL H':dLR  
  //{{AFX_MSG(CHookApp) lK;/97Ze  
  // NOTE - the ClassWizard will add and remove member functions here.  V[D[MZ  
  // DO NOT EDIT what you see in these blocks of generated code ! gQy {OU  
  //}}AFX_MSG x`N _tWZ  
  DECLARE_MESSAGE_MAP() jR~2mf!h*e  
}; e*5TZ7.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); QuFcc}{<]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'G1~\CT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0l#{7^e  
BOOL InitHotkey(); L \0nO i  
BOOL UnInit(); WBTdQG Q6  
#endif s8w7/*<d  
-:9E+b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~F7 +R   
#include "stdafx.h" ~doOt  
#include "hook.h" # Sfz^  
#include <windowsx.h> #fg RF  
#ifdef _DEBUG @kU{  
#define new DEBUG_NEW !>XG$-$`Z  
#undef THIS_FILE B ;Zsp  
static char THIS_FILE[] = __FILE__; 6itp Mck  
#endif ^bpxhf x  
#define MAX_KEY 100 ', -4o-  
#define CTRLBIT 0x04 v=Ep  
#define ALTBIT 0x02 y- S]\tu  
#define SHIFTBIT 0x01 x Lht6%o*  
#pragma data_seg("shareddata") b 62 o  
HHOOK hHook =NULL; .<JD'%?"  
UINT nHookCount =0; j^A0[:2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey gE8=#%1<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT + >o/Ob  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey e-<fkU9^W  
static int KeyCount =0; q 4_&C&7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,ry2J,IT7  
#pragma data_seg() zo66=vE!  
HINSTANCE hins; [uOW\)`  
void VerifyWindow(); yC. ve;lG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) B.2F\ub g  
//{{AFX_MSG_MAP(CHookApp) wc-H`S|@  
// NOTE - the ClassWizard will add and remove mapping macros here. iN%\wkx*N  
// DO NOT EDIT what you see in these blocks of generated code! x#yL&+'?Mj  
//}}AFX_MSG_MAP ]>h2h?2te  
END_MESSAGE_MAP() S9X~<!]  
$^R[t;  
CHookApp::CHookApp() x9r5 ;5TI  
{ n y6-_mA]  
 // TODO: add construction code here, *au&ODa  
 // Place all significant initialization in InitInstance FY"!%)TV  
} v ?@Ys+V  
 8.D$J  
CHookApp theApp; \~ O6S`,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <Q)6N!Tp^  
{ (n7 v $A  
 BOOL bProcessed=FALSE; ai"Kd=R  
 if(HC_ACTION==nCode) -05zcIVo  
 { GRz`fO  
  if((lParam&0xc0000000)==0xc0000000){// Key up eN]0]9JO  
   switch(wParam) s]Z/0:`  
   { *,1^{mb  
    case VK_MENU: #p~tkQ:'1  
     MaskBits&=~ALTBIT; k!E`Xeob  
     break; SPA_a\6_  
    case VK_CONTROL: A S;ra,x  
     MaskBits&=~CTRLBIT; ?}^e,.M0?s  
     break; Q1V4bmM  
    case VK_SHIFT: Pz3jc|Ga  
     MaskBits&=~SHIFTBIT; :,<e  
     break; V/i&8UMw  
    default: //judge the key and send message ,vP9oY[n  
     break; G`E%uyjG$j  
   } E@QsuS2&  
   for(int index=0;index<MAX_KEY;index++){ }8 A]  
    if(hCallWnd[index]==NULL) drT X  
     continue; -Zfzl`r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "^~f.N  
    { o2?[*pa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l'-dB  
     bProcessed=TRUE; UMUr"-l =  
    } * EOIgQp  
   } hBDPz1<  
  } /yn1MW[.  
  else if((lParam&0xc000ffff)==1){ //Key down y6Xfddd61  
   switch(wParam) FCQIfJ#  
   { 8^j u=  
    case VK_MENU: w#k'RuOw5  
     MaskBits|=ALTBIT; ~$w-I\Q!  
     break; R(@7$  
    case VK_CONTROL: %,%s09tO  
     MaskBits|=CTRLBIT; cF_`m  
     break; 5{qFKo"g@,  
    case VK_SHIFT: [r_,BH\nu  
     MaskBits|=SHIFTBIT; m *8[I  
     break; O?NAbxkp  
    default: //judge the key and send message @u3K.}i:g  
     break; 7)G- EAF  
   } f5zxy!dhKS  
   for(int index=0;index<MAX_KEY;index++) H?ssV^k  
   { 4\<[y]pv  
    if(hCallWnd[index]==NULL) `Q6@,-(3  
     continue; HB`u@9le  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c ;`  
    { 7 }(LO^,A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); > taT;[Oa  
     bProcessed=TRUE; 4 W}8?&T  
    } 4%2QF F @  
   } (.7_`T6QG  
  } 9ET2uDZpL  
  if(!bProcessed){ <QT u"i  
   for(int index=0;index<MAX_KEY;index++){ ,6PV"E)_  
    if(hCallWnd[index]==NULL) Y TxUKE:  
     continue; Rj9ME,u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2?rg&og6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3toY#!1Ch  
   } a9Lf_/w{&  
  } |//cA2@.  
 } <I'kJ{"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7qA);N  
} N8 }R<3/  
K$(&Qx}  
BOOL InitHotkey() Z'<=06  
{ ^*'|(Cv  
 if(hHook!=NULL){ j#y_#  
  nHookCount++; z^I"{eT8  
  return TRUE; ~|@aV:k  
 } gt6*x=RCrQ  
 else \ntmD?kA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O:Bfbna  
  if(hHook!=NULL) U#1T HO`  
   nHookCount++; `zRgP#  
  return (hHook!=NULL); VkhZt7]K}B  
} u*{hXR-"  
BOOL UnInit() +jO1?:Lr  
{ B`<(qPD  
 if(nHookCount>1){ -\\}K\*MJ  
  nHookCount--; 7J./SBhB  
  return TRUE; )mxY]W+  
 } neJNMdv@T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g}|a-  
 if(unhooked==TRUE){ Hkg^  
  nHookCount=0; 6G7B&"&  
  hHook=NULL; z,}1K!  
 } `23&vGk}  
 return unhooked; )y'`C@ijI  
} r vVU5zA4H  
b|n%l5 1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }b2U o&][  
{ -w=rNlj  
 BOOL bAdded=FALSE; *_b4j.)ax,  
 for(int index=0;index<MAX_KEY;index++){ b* qkox;j  
  if(hCallWnd[index]==0){ %~J90a  
   hCallWnd[index]=hWnd; g$kK)z  
   HotKey[index]=cKey; UtG@0(6C  
   HotKeyMask[index]=cMask; v<_}Br2I[  
   bAdded=TRUE; I:u xj%  
   KeyCount++; F}<&@7kF  
   break; D}px=?  
  } }\=9l<|  
 } !V$nU8p|  
 return bAdded; s ,\w00-:  
} Hs~M!eK  
_A kc7"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,ZV<o!\  
{ _s (0P*  
 BOOL bRemoved=FALSE; : RnjcnR  
 for(int index=0;index<MAX_KEY;index++){ 7xB#)o53  
  if(hCallWnd[index]==hWnd){ QE)I7(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IJxdbuKg  
    hCallWnd[index]=NULL; *pw:oTO  
    HotKey[index]=0; rI o`n2  
    HotKeyMask[index]=0; \% !]qv  
    bRemoved=TRUE; 6g29!F`y  
    KeyCount--;  Us k@{  
    break; q`E6hm  
   } 0aSN 8  
  } (' /S~  
 } djqSW9  
 return bRemoved; c%>t(ce`Tl  
} h eZJ(mR  
KCq qwGM  
void VerifyWindow() ,;;M69c[ x  
{ 7 ;|jq39  
 for(int i=0;i<MAX_KEY;i++){ N'Ywn}!js  
  if(hCallWnd!=NULL){ F0o7XUt  
   if(!IsWindow(hCallWnd)){ ly%$>BRU  
    hCallWnd=NULL; g10$pf+L  
    HotKey=0; 99G/(Z}  
    HotKeyMask=0; Df||#u=n  
    KeyCount--; m/=,O_  
   } 8<0H(lj7_  
  } E,shTh%&~  
 } K:z|1V  
} x^8xz5:O  
I?J$";A  
BOOL CHookApp::InitInstance() #p&iH9c_  
{ 91E!4t}I  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e%`gD*8  
 hins=AfxGetInstanceHandle(); VvSD &r^qI  
 InitHotkey(); :RzcK>Gub=  
 return CWinApp::InitInstance(); 5ap}(bO  
} Y~dRvt0_w  
3%{XJV   
int CHookApp::ExitInstance() |Q`}a %  
{ }C"EkT!F  
 VerifyWindow(); G'MYTq  
 UnInit(); FlOKTY   
 return CWinApp::ExitInstance(); Ooc,R(  
} Zla5$GM  
$n(?oyf  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g}{Rk>k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bnUpH3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7XT2d=)"  
#if _MSC_VER > 1000 BqvOi~ l  
#pragma once )_ NQ*m  
#endif // _MSC_VER > 1000 FfI $3:9  
m=z-}T5y!T  
class CCaptureDlg : public CDialog -kq=W_  
{ o ]2=5;)  
 // Construction KqcelI?-I  
 public: !\JG]2 \  
  BOOL bTray; OQ 5{#  
  BOOL bRegistered; 1{_tV^3@  
  BOOL RegisterHotkey(); fxI>FhU_  
  UCHAR cKey; \s`'3y  
  UCHAR cMask; yf*MG&}  
  void DeleteIcon(); }%| (G[  
  void AddIcon(); yb*SD!  
  UINT nCount; E+dr\Xhv  
  void SaveBmp(); DvF`KHsy  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  .r[DqC  
  // Dialog Data szF[LRb  
  //{{AFX_DATA(CCaptureDlg) %.pX!jL  
  enum { IDD = IDD_CAPTURE_DIALOG }; (=CV")tF  
  CComboBox m_Key; *^=`HE89S  
  BOOL m_bControl; llhJ,wD  
  BOOL m_bAlt; 7Nh6 `  
  BOOL m_bShift; _I<eJ\  
  CString m_Path; [ k^6#TQcn  
  CString m_Number; $bF.6  
  //}}AFX_DATA Y{1IRP?S  
  // ClassWizard generated virtual function overrides JiDX|Q<c  
  //{{AFX_VIRTUAL(CCaptureDlg) kFHqQs aG  
 public: /e|`mu%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1FjA   
 protected: ]r$S{<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 702&E(rx,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -1Lh="US  
  //}}AFX_VIRTUAL i:&Y{iPQp  
  // Implementation ZUQ1\Iw  
 protected: ~ I]kY%  
  HICON m_hIcon; H_ .@{8I  
  // Generated message map functions 9:!n'mn  
  //{{AFX_MSG(CCaptureDlg) (5_l7hWY  
  virtual BOOL OnInitDialog(); uWG'AmK_#E  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); isj<lnQ  
  afx_msg void OnPaint(); NlU:e}zGR  
  afx_msg HCURSOR OnQueryDragIcon(); 16keCG\  
  virtual void OnCancel(); q_g'4VZv  
  afx_msg void OnAbout(); $T^O38$  
  afx_msg void OnBrowse(); 8|dl t$  
  afx_msg void OnChange(); j08 G-_Gjn  
 //}}AFX_MSG :V HJD  
 DECLARE_MESSAGE_MAP() uB 6`e!Q  
}; tJUMLn?  
#endif U/&?rY^|  
TA`*]*O(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file GTYGm  
#include "stdafx.h" D(~6h,=m  
#include "Capture.h" |LcN_ ,}6  
#include "CaptureDlg.h" cwz %LKh  
#include <windowsx.h> \kzxt/Ow  
#pragma comment(lib,"hook.lib") G( nT.\  
#ifdef _DEBUG LdU, 32  
#define new DEBUG_NEW wQ2'%T|t  
#undef THIS_FILE y 8];MTl  
static char THIS_FILE[] = __FILE__; 'hVOK(o 0  
#endif :?RooJ~#  
#define IDM_SHELL WM_USER+1 3.Ni%FF`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qX0IHe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); er+m:XuV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; XsQ<ye un  
class CAboutDlg : public CDialog cI?dvfU?  
{ S@Yb)">ZQ  
 public: JXftQOn  
  CAboutDlg(); ah"2^x  
  // Dialog Data UQPd@IVu6  
  //{{AFX_DATA(CAboutDlg) :QUZ7^u  
  enum { IDD = IDD_ABOUTBOX }; Dd!MG'%hlb  
  //}}AFX_DATA M_T$\z;,  
  // ClassWizard generated virtual function overrides 7w @.)@5  
  //{{AFX_VIRTUAL(CAboutDlg) Vhz?9i6|g^  
 protected: `2J6Dz"W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `;hsOfo  
  //}}AFX_VIRTUAL oE"!  
  // Implementation  n1y#gC  
 protected: r7C  m  
  //{{AFX_MSG(CAboutDlg) yHCQY4/  
  //}}AFX_MSG G+m|A*[>  
  DECLARE_MESSAGE_MAP() I = qd\  
}; W5 fO1F  
R|$=Pfg~4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }&y>g0$@  
{ m3F.-KPO  
 //{{AFX_DATA_INIT(CAboutDlg) }-V .upl  
 //}}AFX_DATA_INIT 4D$$KSa  
} , j'=sDl  
k#JFDw\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S?OK@UEJ  
{ s]5wzbFO  
 CDialog::DoDataExchange(pDX); @K4} cP  
 //{{AFX_DATA_MAP(CAboutDlg) J0d +q!  
 //}}AFX_DATA_MAP ,BW ^j.7  
} 89`AF1  
_<pG}fmR  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |ng[s6uf  
 //{{AFX_MSG_MAP(CAboutDlg) 9C|T/+R  
 // No message handlers x@v,qF$K  
 //}}AFX_MSG_MAP WB6g i2  
END_MESSAGE_MAP() gSZ NsiH  
>kz5azV0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V/"0'H\"1  
: CDialog(CCaptureDlg::IDD, pParent) /B|#GJ\\3  
{ #c+N}eX{  
 //{{AFX_DATA_INIT(CCaptureDlg) QMy;?,  
  m_bControl = FALSE; *ErTDy(   
  m_bAlt = FALSE; aZ*b"3  
  m_bShift = FALSE; U[U$1LSS  
  m_Path = _T("c:\\"); +'uF3- +WY  
  m_Number = _T("0 picture captured."); 6M"J3\ x  
  nCount=0; dvyE._/v  
  bRegistered=FALSE; u\^<V)  
  bTray=FALSE; I y8gQdI  
 //}}AFX_DATA_INIT @o9EX }  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [ ]3xb`<&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #mk#&i3"k  
} hB P]^~(  
7R7g$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Te$/[`<U  
{ S &s7]  
 CDialog::DoDataExchange(pDX); U6jlv3  
 //{{AFX_DATA_MAP(CCaptureDlg) -CtA\< 7I  
  DDX_Control(pDX, IDC_KEY, m_Key); BB--UM{7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %lv2;-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6}C4 SZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U+@yx>!  
  DDX_Text(pDX, IDC_PATH, m_Path); ^=OjsN  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  t Z\  
 //}}AFX_DATA_MAP f:Nfw+/q  
} F m h;d*IT  
Q`5jEtu#,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UQ'D-eK  
//{{AFX_MSG_MAP(CCaptureDlg) %CF(SK2w  
 ON_WM_SYSCOMMAND() -T4?5T_  
 ON_WM_PAINT() C.8]~MP  
 ON_WM_QUERYDRAGICON() Haj`mc!<D0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >bz}IcZP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IJS9%m#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .A\9|sRZ5  
//}}AFX_MSG_MAP T6O Ib  
END_MESSAGE_MAP() Tud[VS?99  
&:akom8  
BOOL CCaptureDlg::OnInitDialog() 0e q>  
{ 9S=9m[#y'  
 CDialog::OnInitDialog(); YOGw Q  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K+ufcct  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y<w2_+(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); yHr/i) c  
 if (pSysMenu != NULL) /  DeI s  
 { EZ1H0fm  
  CString strAboutMenu; SQ>.P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~S"G~a(&j  
  if (!strAboutMenu.IsEmpty()) #4%,09+  
  { k-e_lSYk&c  
   pSysMenu->AppendMenu(MF_SEPARATOR); /Wg$.<!5 }  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g@MTKqs  
  } {n$9o  
 } eW\7X%I  
 SetIcon(m_hIcon, TRUE); // Set big icon e_k1pox]l  
 SetIcon(m_hIcon, FALSE); // Set small icon fcnbPO0M  
 m_Key.SetCurSel(0); a3R#Bg(  
 RegisterHotkey(); }k\a~<'X  
 CMenu* pMenu=GetSystemMenu(FALSE); qFe|$rVVIl  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1@CI7j  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |5e/.T$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -$dnUXFsj[  
 return TRUE; // return TRUE unless you set the focus to a control RBt"7'  
} /}#z/m@bN  
ofcoNLX5c  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #`y7L4V*o  
{ =;dupz\7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) n U$Lp`  
 { [5a`$yaQ  
  CAboutDlg dlgAbout; j,EE`g&  
  dlgAbout.DoModal(); sKn>K/4JZ  
 } :E4i@ O7%  
 else cU%#oEMf<  
 { uZm<:d2%)  
  CDialog::OnSysCommand(nID, lParam); `5[VO  
 } ^L]+e  
} 2NIK0%6  
;oob TW{  
void CCaptureDlg::OnPaint() 78dmXOZ'_h  
{ .Pxb9mW  
 if (IsIconic())  EvTdwX.H  
 { 'PV,c|f>  
  CPaintDC dc(this); // device context for painting JS({au  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WQiEQ>6(t(  
  // Center icon in client rectangle .LnXKRd{  
  int cxIcon = GetSystemMetrics(SM_CXICON); *% Vd2jW/  
  int cyIcon = GetSystemMetrics(SM_CYICON); s) V7$D  
  CRect rect; KM< M^l_Q  
  GetClientRect(&rect); si3i#l&.b_  
  int x = (rect.Width() - cxIcon + 1) / 2; )bi*y`UM]  
  int y = (rect.Height() - cyIcon + 1) / 2; @hl5^d"l  
  // Draw the icon N<"_5  
  dc.DrawIcon(x, y, m_hIcon); c)iQ3_&=  
 } >hB]T%'  
 else sGMC$%e}  
 { [gIStKe  
  CDialog::OnPaint(); |I)xK@7  
 } iu*u|e  
} h-lMrI)U?h  
+;FF0_   
HCURSOR CCaptureDlg::OnQueryDragIcon() "Q2[A]4E  
{ 6$fC R  
 return (HCURSOR) m_hIcon; cl:*Q{(Cjk  
} AGK+~EjL@  
g@B9i =  
void CCaptureDlg::OnCancel() #\%Gr tM  
{ t~sW]<qjp  
 if(bTray) aOWbIS[8  
  DeleteIcon(); ,dZ 9=]  
  CDialog::OnCancel(); <`-"K+e!J  
} CEqfsKrsxE  
1hi^  
void CCaptureDlg::OnAbout() \&ERSk2  
{ @_N -> l  
 CAboutDlg dlg; hl6al:Y  
 dlg.DoModal(); C:EF(/>+-  
} ~NU~jmT2  
q_cqjly<  
void CCaptureDlg::OnBrowse() PJO;[: .I  
{ 0S/&^  
 CString str; mUcHsCszH  
 BROWSEINFO bi; L?Wl#wP\;*  
 char name[MAX_PATH]; -s:JD J*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); sDJ5'ul  
 bi.hwndOwner=GetSafeHwnd(); Br \/7F  
 bi.pszDisplayName=name; V&h ,v%$  
 bi.lpszTitle="Select folder"; eA{,=, v)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6K?+adKlc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); &/=xtO/Z{  
 if(idl==NULL) zx#d _SVi  
  return; <XCH{Te1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 47$JN}qI0  
 str.ReleaseBuffer(); >s[}f6*2@  
 m_Path=str; c{||l+B  
 if(str.GetAt(str.GetLength()-1)!='\\') +1h^9 Y'  
  m_Path+="\\"; bTHJbpt*-  
 UpdateData(FALSE); GN=F-*2  
} ~;bwfp_  
w<\N-J|m  
void CCaptureDlg::SaveBmp() dn%/SJC  
{ bsqoR8  
 CDC dc; Q6Jb]>g\H  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); G!0|ocE}  
 CBitmap bm; O}#*U+j  
 int Width=GetSystemMetrics(SM_CXSCREEN); M 80Us.  
 int Height=GetSystemMetrics(SM_CYSCREEN); iDHmS6_c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ag|d_;  
 CDC tdc; r'xa' 6&  
 tdc.CreateCompatibleDC(&dc);  pSV 8!  
 CBitmap*pOld=tdc.SelectObject(&bm); z81I2?v[Jr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BtU,1`El5  
 tdc.SelectObject(pOld); El"XF?OgpP  
 BITMAP btm; DU}q4u@ )  
 bm.GetBitmap(&btm); M7jDV|Go  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; R8":1 #&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); c!w4N5aM  
 BITMAPINFOHEADER bih; !ZSC"  
 bih.biBitCount=btm.bmBitsPixel; c{FvMV2em  
 bih.biClrImportant=0; >A2& Mjo  
 bih.biClrUsed=0; Ge(r6"%7  
 bih.biCompression=0; hrEKmRmF-  
 bih.biHeight=btm.bmHeight; B<:i[~`7t  
 bih.biPlanes=1; b!7"drge:  
 bih.biSize=sizeof(BITMAPINFOHEADER); CZwZ#WV6  
 bih.biSizeImage=size; I&1Mh4yu  
 bih.biWidth=btm.bmWidth; i}+dctg/  
 bih.biXPelsPerMeter=0; (_<ruwV]`  
 bih.biYPelsPerMeter=0; :Tj,;0#/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); He j0l^  
 static int filecount=0; VMen:  
 CString name; +k8><_vr}  
 name.Format("pict%04d.bmp",filecount++); 9;h 1;9sC|  
 name=m_Path+name; EWH'x$z_q  
 BITMAPFILEHEADER bfh; 7J$ ^R6rh  
 bfh.bfReserved1=bfh.bfReserved2=0; xvpS%MS  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Oe2Tmvl  
 bfh.bfSize=54+size; E.6^~'/  
 bfh.bfOffBits=54; U$0#j  
 CFile bf; __3Cjo^6&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @["Vzg!I6"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y}#bCRy~.A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $Fd9iJ!k  
  bf.WriteHuge(lpData,size); H Qf[T@  
  bf.Close();  kQX,MP(  
  nCount++; G=~T)e  
 } U%w-/!p  
 GlobalFreePtr(lpData); `33h4G  
 if(nCount==1) %o^'(L@z  
  m_Number.Format("%d picture captured.",nCount); 6pr}A  
 else -R6z/P (}  
  m_Number.Format("%d pictures captured.",nCount); ?*}V>h 8m)  
  UpdateData(FALSE); Z(Q?epyT  
} p?Yovckm  
&Hh%pY"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) yDy3;*lE  
{ 27,WP-qie  
 if(pMsg -> message == WM_KEYDOWN) U R@'J@V#:  
 { 2!&:V]  
  if(pMsg -> wParam == VK_ESCAPE) ,$}v_-:[l  
   return TRUE; $lV0TCgba8  
  if(pMsg -> wParam == VK_RETURN) \>,{)j q;  
   return TRUE; <=19KSGFt  
 } \Sm.]=b r  
 return CDialog::PreTranslateMessage(pMsg); [lyB@) 6.  
} E\RQm}Z09  
n:k~\-&WJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [!bTko>rSB  
{ <niHJ*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '%K,A-7W  
  SaveBmp(); %li'j|  
  return FALSE; <([o4%  
} u!{P{C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nM}X1^PiK"  
 CMenu pop; #C !8a  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {u9VHAXCf  
 CMenu*pMenu=pop.GetSubMenu(0); V3I&0P k  
 pMenu->SetDefaultItem(ID_EXITICON); O a-Z eCq  
 CPoint pt; 9"MC<  
 GetCursorPos(&pt); E;-R<X5n  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^dqyX(  
 if(id==ID_EXITICON) p|AIz3  
  DeleteIcon(); oSy[/Y44a  
 else if(id==ID_EXIT) 5F <zW-;  
  OnCancel(); ;t*45  
 return FALSE; ,ci tzh  
} Ce`{M&NSWX  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jsi\*5=9p<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *W# x#0j  
 AddIcon(); 9>%f99n  
 return res; v*3ezf\  
} Lxd*W2$3_  
{f3T !e{  
void CCaptureDlg::AddIcon() lBPZB%  
{ fdp/c wd  
 NOTIFYICONDATA data; oD!72W_:  
 data.cbSize=sizeof(NOTIFYICONDATA); N,Y<mX  
 CString tip; *K m%Vl  
 tip.LoadString(IDS_ICONTIP); 6 D~b9 e  
 data.hIcon=GetIcon(0); 4[+n;OI  
 data.hWnd=GetSafeHwnd(); -?'u"*#1,  
 strcpy(data.szTip,tip); m=j7 vb  
 data.uCallbackMessage=IDM_SHELL; CS6,mX  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =b !f  
 data.uID=98; 5:56l>0  
 Shell_NotifyIcon(NIM_ADD,&data); #l:qht  
 ShowWindow(SW_HIDE); ]j_S2lt  
 bTray=TRUE; hc~--[1c:  
} Hh54&YKZ  
Ybd){Je"z  
void CCaptureDlg::DeleteIcon() 5O*. qp?  
{ BnAia3z  
 NOTIFYICONDATA data; Eiz\Nb  
 data.cbSize=sizeof(NOTIFYICONDATA); LFg<j1Gk`  
 data.hWnd=GetSafeHwnd(); Pme`UcE3H  
 data.uID=98; _=4Dh/Dv  
 Shell_NotifyIcon(NIM_DELETE,&data); yfuvU2nVH  
 ShowWindow(SW_SHOW); y;#p=,r  
 SetForegroundWindow(); Isoqs(Oi  
 ShowWindow(SW_SHOWNORMAL); <qHwY.  
 bTray=FALSE; s u![ST(  
}  dsJ}C|N  
$WTu7lVV[1  
void CCaptureDlg::OnChange() #2x\d  
{ ~Bj-n6QDE  
 RegisterHotkey(); \? MuORg  
} eFZ`0V0  
f9OVylm  
BOOL CCaptureDlg::RegisterHotkey() VbA#D4;  
{ 9{ciD "!&V  
 UpdateData(); (AR-8  
 UCHAR mask=0; f N t  
 UCHAR key=0; rmWG9&coW  
 if(m_bControl) B8[H><)o\y  
  mask|=4; jC; XY!d6  
 if(m_bAlt) ^$rt|]  
  mask|=2; V^?+|8_(  
 if(m_bShift) 183'1Z$KA  
  mask|=1; p &XbXg-  
  key=Key_Table[m_Key.GetCurSel()];  "FG6R'  
 if(bRegistered){ VWbgusxJ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); iM}cd$r{  
  bRegistered=FALSE; Vs9fAAXS4  
 } LH<--#K  
 cMask=mask; zjVb+Z\n  
 cKey=key; SznNvd <  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^@L  
 return bRegistered; y"2#bq  
} 9$#2+G!J  
V3F2Z_VH2  
  四、小结 p[g!LD  
HM ^rk  
  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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