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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: 'W(+rTFf!  
  i ?&t@"'  
  一、实现方法 J3fk3d`2  
,m;S-Im_Xr  
  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: UbNA|`H  
,pM~Phmp  
#pragma data_seg("shareddata") ~b}a|K  
HHOOK hHook =NULL; //钩子句柄 5\gL+ qM0  
UINT nHookCount =0; //挂接的程序数目 R4"*<%1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Xb?:dlu3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >L\$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,V1/(|[h  
static int KeyCount =0; a8ya5EO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 I@Pp[AyG  
#pragma data_seg() -sO[,  
sU!h^N$  
  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。 (Q5rOrA"  
is~"yE7  
  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: #|PPkg%v<  
7MWd(n-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J.E Bt3  
cKey,UCHAR cMask) G]]"J c  
{ n!aA<  
 BOOL bAdded=FALSE; P"(VRc6x  
 for(int index=0;index<MAX_KEY;index++){ 45.<eWH$*(  
  if(hCallWnd[index]==0){ }Q2v~eD  
   hCallWnd[index]=hWnd; 7xF)\um  
   HotKey[index]=cKey; 18^#:=Z  
   HotKeyMask[index]=cMask; l4s*+H$vd?  
   bAdded=TRUE; jKh:}yl4  
   KeyCount++; }_/]f!]  
   break; D`|8Og  
  } $e~MKLd  
 } N#``(a  
 return bAdded; noNJ+0S  
} M)F_$ ICE-  
//删除热键 c,2OICj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tJG+k)EE  
{ aD(3.=[R  
 BOOL bRemoved=FALSE; `q9n`h1  
 for(int index=0;index<MAX_KEY;index++){ TU6(Q,Yi|  
  if(hCallWnd[index]==hWnd){ E^iShe  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +v2)'?BS  
    hCallWnd[index]=NULL; YQ$LU \:  
    HotKey[index]=0; {Gr"lOi*@  
    HotKeyMask[index]=0; A`--*$8\  
    bRemoved=TRUE; Kv9$c(~#  
    KeyCount--; Z0/$XS9|h;  
    break; qyBC1an5,  
   } 'fs tfk  
  } PNz]L  
 }  bUsX~R-  
 return bRemoved; EI9;J-c  
} rB|1<jR  
vX7U|zy  
;reBJk  
  DLL中的钩子函数如下: HUAbq }  
v.&c1hKHb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #bJp)&LO  
{ ?KB] /gT^  
 BOOL bProcessed=FALSE; v.- r %j{I  
 if(HC_ACTION==nCode) W ]$/qyc&J  
 { 4ClSl#X#i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 G|*&owJ  
   switch(wParam) i&1rf|  
   {  r#A*{4wz  
    case VK_MENU: !{4'=+  
     MaskBits&=~ALTBIT; M&jlUr&l  
     break; T, +=ka$  
    case VK_CONTROL: Y_}_)nE@m  
     MaskBits&=~CTRLBIT; !PA><F  
     break; 3GNcnb  
    case VK_SHIFT: jXVvVv  
     MaskBits&=~SHIFTBIT; 0K6My4d{  
     break; rq^%)tR  
    default: //judge the key and send message OTGy[jY"  
     break; #1C]ZV] B  
   } w=CzPNRHH!  
   for(int index=0;index<MAX_KEY;index++){ @eZBwFe  
    if(hCallWnd[index]==NULL) qDTdYf  
     continue; D66NF;7q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fJP *RVz  
    { &qK:LHhj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JQ;.+5 N<K  
     bProcessed=TRUE; gkX7,J-0  
    } 6yBd9=3K  
   } Z ^}[CQ&Am  
  } {/(.Bpld  
  else if((lParam&0xc000ffff)==1){ //有键按下 (t\U5-w  
   switch(wParam) IRdR3X56  
   { 6O/c%1VHA3  
    case VK_MENU: )Fp$ *]|  
     MaskBits|=ALTBIT; S8B?uU  
     break; ?E_;[(Mcr  
    case VK_CONTROL: nbB*d@"  
     MaskBits|=CTRLBIT; ,  O/IY  
     break; : 5['V#(o  
    case VK_SHIFT: u;]xAr1  
     MaskBits|=SHIFTBIT; 6" <(M@  
     break; ;X a N  
    default: //judge the key and send message q2r$j\L%  
     break; .heU Ir,  
   } }zS5o [OE  
   for(int index=0;index<MAX_KEY;index++){ 2NJ\`1HZ\  
    if(hCallWnd[index]==NULL) liG|#ny{  
     continue; 1<fW .Q)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) : 8j7}'  
    { )[cuYH>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K,JK9)T  
     bProcessed=TRUE; !zm;C@}ln  
    } Xz)qtDN|(  
   } Cl9rJ oT  
  } dWQB1Y*N  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (5E09K$  
   for(int index=0;index<MAX_KEY;index++){ _~MX~M3MB  
    if(hCallWnd[index]==NULL) ;2\6U;  
     continue; \'<P~I&p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JBLUX,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rjiHP;-t1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Zhv%mUj~  
   } '<YBoU{ e*  
  } a;^lOU|L{  
 } {l5fKVb\C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HzKY2F(,  
} Y)]C.V,~  
Vs{\ YfF  
  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: 4p-"1 c$  
L@/IyQ[H1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z]R#F0"U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "g#%d  
fqY'Uq$=  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 'Etq;^H  
b=xn(HE8|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1AN$s  
{ V" 8 G-dK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _<{<b  
 { dr}PjwW%  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PZJ9f8 V  
  SaveBmp(); f+hHc8g  
  return FALSE; );VuZsmi  
 } T]Ai{@i  
 …… //其它处理及默认处理 _K!.TM+9  
} |idw?qCn  
2nC,1%kxhq  
DBB&6~;?  
  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。 fglfnx0{  
A]5];c  
  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。 YS){ N=g&'  
^iJyo&I  
  二、编程步骤 1=z[U|&R  
%b<W]HwA  
  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"; _p%n%Oce  
pv sa?z;rP  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M*ZN]9{^.  
Y 0Fq -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; isd-b]@:Lc  
1w(3!Ps+  
  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; j|wN7@Zc  
[8IO0lul+  
  5、 添加代码,编译运行程序。 wB[f%mHs  
c+e?xXCEAz  
三、程序代码 W"_<SYVJ  
M1xsGa9h&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `MuX/ [q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 65qqs|&w;[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ _Iav2= 0Wi  
#if _MSC_VER > 1000 ^ex\S8j  
#pragma once -yc YQ~R  
#endif // _MSC_VER > 1000 mc8Q2eQat}  
#ifndef __AFXWIN_H__ &`v?oN9$  
#error include 'stdafx.h' before including this file for PCH {~&Q"8 }G  
#endif ;]Q6K9.d8  
#include "resource.h" // main symbols =dDPQZEin  
class CHookApp : public CWinApp X:g5;NT  
{ Fy Ih\  
 public: _8u TK%|  
  CHookApp(); %eg+ .  
  // Overrides <n]PD;.4  
  // ClassWizard generated virtual function overrides ^gvTc+|  
  //{{AFX_VIRTUAL(CHookApp) HS{Vohy>  
 public: Ge-Bk)6  
  virtual BOOL InitInstance(); s__xBY  
  virtual int ExitInstance(); [M~tH *4"  
  //}}AFX_VIRTUAL S \]O8#OX  
  //{{AFX_MSG(CHookApp) 2wY|E<E  
  // NOTE - the ClassWizard will add and remove member functions here. b/:wpy+9Z  
  // DO NOT EDIT what you see in these blocks of generated code ! f|q/2}Bqb  
  //}}AFX_MSG `_OrBu[  
  DECLARE_MESSAGE_MAP() e6j1Fa9  
}; FefroaJ:u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $YEm(:v$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T3z ovnR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?<!q F:r:  
BOOL InitHotkey(); 1$vGQ  
BOOL UnInit(); )xV37]  
#endif 8eS(gKD  
ewk7:zS/?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zx}+Q B0  
#include "stdafx.h" z:#]P0  
#include "hook.h" `-pwP  
#include <windowsx.h> kPs?  
#ifdef _DEBUG JFm@jc  
#define new DEBUG_NEW cr!W5+r  
#undef THIS_FILE H1kI+YJ@  
static char THIS_FILE[] = __FILE__; x'`{#bKD  
#endif I </P_:4G  
#define MAX_KEY 100 ?CQE6ch  
#define CTRLBIT 0x04 bN. G%1  
#define ALTBIT 0x02 i86:@/4~F  
#define SHIFTBIT 0x01 2 L4[~>  
#pragma data_seg("shareddata") Qt+D ,X  
HHOOK hHook =NULL; 4@-tT;$  
UINT nHookCount =0; h(/? 81:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _  Lh0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT pKc!sd C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Og7yT{h_  
static int KeyCount =0; $?PI>9g!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift jum"T\  
#pragma data_seg() <=7nTcO~  
HINSTANCE hins; vTK%8qoZ  
void VerifyWindow(); F6q=W#~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JU>~[yAP  
//{{AFX_MSG_MAP(CHookApp) qIZ+%ZOu  
// NOTE - the ClassWizard will add and remove mapping macros here. \|Af26  
// DO NOT EDIT what you see in these blocks of generated code! Z {^!z  
//}}AFX_MSG_MAP s5@BVD'}E  
END_MESSAGE_MAP() FFw(`[A_  
arm_SyL0  
CHookApp::CHookApp() Bo "9;F  
{ W]D YfR,  
 // TODO: add construction code here, bPFGQlmIO  
 // Place all significant initialization in InitInstance 8`*5[ L~~/  
} ;I*t5{  
kc2B_+Y1  
CHookApp theApp; t08U9`w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MM32\}Y6  
{ :5~Dca_iU4  
 BOOL bProcessed=FALSE; 1/9*c *w  
 if(HC_ACTION==nCode) N9/k`ZGC  
 { F7=9> ,  
  if((lParam&0xc0000000)==0xc0000000){// Key up vX }iA|`#  
   switch(wParam) ^ `yhN  
   { @sn:%/x_  
    case VK_MENU: "Y+VNS  
     MaskBits&=~ALTBIT; `?$-T5Rr  
     break; QgU]3`z"  
    case VK_CONTROL: W@AHE?s6g  
     MaskBits&=~CTRLBIT; r B+ (  
     break; Hj >fg2/  
    case VK_SHIFT: Hi[lN7ma8  
     MaskBits&=~SHIFTBIT; [s^p P2  
     break; z#Jw?K_  
    default: //judge the key and send message \>:t={>;  
     break; jY9tq[~/  
   } oVuIHb0w  
   for(int index=0;index<MAX_KEY;index++){ fm^tU0DY  
    if(hCallWnd[index]==NULL) LCRWC`%&  
     continue; 1\-lAk!   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5FJ%"5n&  
    { z 4. |N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x6T$HN/2  
     bProcessed=TRUE; ! , ]Fx  
    } V'.gE6we  
   } Rp zuSh  
  } K~&3etQF  
  else if((lParam&0xc000ffff)==1){ //Key down |<]wM(GxE  
   switch(wParam) |[V6R\l39  
   { '6WZi|(a  
    case VK_MENU: w0>5#j q#r  
     MaskBits|=ALTBIT; K=sk1<>)m  
     break; O>wGJ.  
    case VK_CONTROL: +ZwTi!W  
     MaskBits|=CTRLBIT; UBwYwm0  
     break; Sr6iQxE  
    case VK_SHIFT: <p_2&& ?  
     MaskBits|=SHIFTBIT; ='/#G0W  
     break; 8r.MODZG/  
    default: //judge the key and send message huin?,eGz  
     break; sGMnm  
   } 78mJ3/?rC  
   for(int index=0;index<MAX_KEY;index++) Xp|$z~  
   { . }tpEvAw}  
    if(hCallWnd[index]==NULL) G~lnX^46"  
     continue; YBk* CW9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -fz(]d  
    { H#`&!p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,+_gx.H2j  
     bProcessed=TRUE; 6 1K:SXj  
    } ^F"eHUg  
   } =?B[oq  
  } 6nk.q|n:g  
  if(!bProcessed){ ~qW"v^<  
   for(int index=0;index<MAX_KEY;index++){ TP/bPZY  
    if(hCallWnd[index]==NULL) H,1I z@W1  
     continue; k*T&>$k}^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8g 2'[ci$q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !:dhK  
   } y=WCR*N  
  } nqujT8  
 } W QyMM@#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =hKu85  
} I#t# %!InH  
U| 1&=8l  
BOOL InitHotkey() }D#[yE,=\  
{ H h;o<N>U  
 if(hHook!=NULL){ U[l{cRT   
  nHookCount++; & MfnH  
  return TRUE; |Q~5TL>b  
 } T`^LWc"  
 else Fm.IRu<\`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); g(zoN0~  
  if(hHook!=NULL) "/U~j4O  
   nHookCount++; <3aW3i/jTc  
  return (hHook!=NULL); c:G0=5  
} vJ!<7 l&  
BOOL UnInit() 0Z~G:$O/i  
{ q1o)l  
 if(nHookCount>1){ \wo'XF3:  
  nHookCount--; W(UrG]J*l  
  return TRUE; |h1 Y3  
 } lw 9 rf4RF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >5=uq _QY  
 if(unhooked==TRUE){ wrt^0n'r)c  
  nHookCount=0; erZ%C <  
  hHook=NULL; l 7=WO#Pb  
 } 5oI gxy  
 return unhooked; HvVS<Ke  
} @8 GW?R  
'uA$$~1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mq~L1< f  
{ *6%r2l'kZ  
 BOOL bAdded=FALSE; '@+a]kCMev  
 for(int index=0;index<MAX_KEY;index++){ d#G H4+C  
  if(hCallWnd[index]==0){ o8lwwM*  
   hCallWnd[index]=hWnd; -nrfu)G  
   HotKey[index]=cKey; v/lQ5R1  
   HotKeyMask[index]=cMask; B&)o:P7h  
   bAdded=TRUE; !;^TW$ G  
   KeyCount++; %]i("21  
   break; u9%)_Q!14  
  } }7jg>3ng(  
 } oU m"qt_  
 return bAdded; bf `4GD(  
} M[0@3"}}  
67Ai.3dR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) PCs+` WP!M  
{ #nc{MR#R  
 BOOL bRemoved=FALSE; .h^."+TJ  
 for(int index=0;index<MAX_KEY;index++){ GP uAIoBo  
  if(hCallWnd[index]==hWnd){ X;T(?,,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6tM CpSJ  
    hCallWnd[index]=NULL; :JSOj@s  
    HotKey[index]=0; Xb42R1  
    HotKeyMask[index]=0; A1p;Ye>o~  
    bRemoved=TRUE; NrTQ}_3)  
    KeyCount--; VuFH >8n  
    break; b:>(U.   
   } j3~:\H  
  } o\8yYX  
 } g^1M]1.f  
 return bRemoved; $CO^dFf  
}  AMvM H  
8|?$KLz?F>  
void VerifyWindow() \<~[uv'  
{ V$-IRdb  
 for(int i=0;i<MAX_KEY;i++){ y&A*/J4P  
  if(hCallWnd!=NULL){ y`=A$>A  
   if(!IsWindow(hCallWnd)){ 4_`+&  
    hCallWnd=NULL; K3TMTY<p  
    HotKey=0; CO1D.5  
    HotKeyMask=0; [z`U 9J  
    KeyCount--; on+ c*#  
   } vj^vzFbK  
  } AU$W=Z*  
 } 6Ez}A|i  
} wCvtw[6  
J(h=@cw  
BOOL CHookApp::InitInstance() 7f'9Dm`  
{ |~W!Y\l-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G1vWHa7n;f  
 hins=AfxGetInstanceHandle(); &2MW.,e7s  
 InitHotkey(); "Q#/J)N  
 return CWinApp::InitInstance(); WtFv"$V  
} FlRbGg^  
Ej ip%m  
int CHookApp::ExitInstance() }f<.07  
{ f$NudG!S  
 VerifyWindow(); G{i}z^n  
 UnInit(); !t{3IE  
 return CWinApp::ExitInstance(); 6?Rm>+2>v  
} %7Z _Hw  
Gb<)U[Hfd  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <jQ?l% \  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ioIUIp+B~u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @/ wJW``;  
#if _MSC_VER > 1000 _LFZ0  
#pragma once +T+f``RcK  
#endif // _MSC_VER > 1000 Ti!j  
/);cl;"  
class CCaptureDlg : public CDialog _0 USe  
{ x1]^].#Eo  
 // Construction >0=`3X|Y7  
 public: PtCwr)B,  
  BOOL bTray; zJOjc/\  
  BOOL bRegistered; B9/x?Jv1  
  BOOL RegisterHotkey(); gd R wh  
  UCHAR cKey; {^1GHU  
  UCHAR cMask; ;+g p#&i`  
  void DeleteIcon(); h-=3 b  
  void AddIcon(); h)"PPI  
  UINT nCount; j#"?Oe{_1  
  void SaveBmp(); =LL5E}xP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ji="vs=y  
  // Dialog Data )d bi  
  //{{AFX_DATA(CCaptureDlg) S " R]i  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^<'5 V)  
  CComboBox m_Key; ce\]o^4  
  BOOL m_bControl; fmXA;^%  
  BOOL m_bAlt; rJ4 O_a5/  
  BOOL m_bShift; %kS+n_*  
  CString m_Path; 9Ruj_U  
  CString m_Number; ZMy0iQ@  
  //}}AFX_DATA k)UF.=$d  
  // ClassWizard generated virtual function overrides %g{m12  
  //{{AFX_VIRTUAL(CCaptureDlg) 4P( Y34j  
 public: tI|?k(D  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8Gzc3  
 protected: 3 k py3z[%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vcy}ZqWBO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v=EV5#A  
  //}}AFX_VIRTUAL nR-`;lrF~  
  // Implementation +VkhM;'"C  
 protected: dElOy?v  
  HICON m_hIcon; abh='5H|^|  
  // Generated message map functions 9}Ud'#E  
  //{{AFX_MSG(CCaptureDlg) x+x 6F  
  virtual BOOL OnInitDialog(); 1P:r=Rt/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0W<:3+|n4  
  afx_msg void OnPaint(); tT'*Uu5  
  afx_msg HCURSOR OnQueryDragIcon(); sy=M#WGS  
  virtual void OnCancel(); NBuibL  
  afx_msg void OnAbout(); l)< '1dqe  
  afx_msg void OnBrowse(); q{5wx8_U  
  afx_msg void OnChange(); YQ9@Dk0R  
 //}}AFX_MSG Kq@nBkO4  
 DECLARE_MESSAGE_MAP() 0)`{]&  
}; la:i!q AH  
#endif ~s{yh-B  
h@}KBK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i_Dv+^&zV  
#include "stdafx.h" +e?mKLw14  
#include "Capture.h" +ntrp='7O7  
#include "CaptureDlg.h" SQhk)S  
#include <windowsx.h> bCr) 3,  
#pragma comment(lib,"hook.lib") GO{o #}  
#ifdef _DEBUG WJbdsPs  
#define new DEBUG_NEW DG,CL8bv  
#undef THIS_FILE Oa~|a7`o  
static char THIS_FILE[] = __FILE__; f_a.BTtNO  
#endif .|[ZEXq  
#define IDM_SHELL WM_USER+1 v-M3/*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NSH20$A<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WBD e`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _9!*laR!2  
class CAboutDlg : public CDialog P=PcO>  
{ 7OY<*ny  
 public: Jlw%t!Kx  
  CAboutDlg(); [ fvip_Pt  
  // Dialog Data gZ%wm Y  
  //{{AFX_DATA(CAboutDlg) sf )ojq6s  
  enum { IDD = IDD_ABOUTBOX }; Z0*Lm+d9z  
  //}}AFX_DATA CBw/a0Uck  
  // ClassWizard generated virtual function overrides 9s\(yC8h  
  //{{AFX_VIRTUAL(CAboutDlg) jY>|>]4X  
 protected: R\k= CoJJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support par| j]  
  //}}AFX_VIRTUAL ,FR FH8p  
  // Implementation #v!(uuq,  
 protected: d'ddxT$GG  
  //{{AFX_MSG(CAboutDlg) .BN~9w  
  //}}AFX_MSG v,t;!u,40  
  DECLARE_MESSAGE_MAP() #U45H.Rz  
}; EWuuNf  
mUW|4zl i}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YI05?J}  
{ i'&KoR ?  
 //{{AFX_DATA_INIT(CAboutDlg) JTbg8b  
 //}}AFX_DATA_INIT lr SdFJ%  
} *>Sb4:  
n';"c;Ye)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) lF-;h{   
{ `H+~LVH  
 CDialog::DoDataExchange(pDX); i*3 4/  
 //{{AFX_DATA_MAP(CAboutDlg) 7^$PauAv  
 //}}AFX_DATA_MAP ]~S,K}T  
} L B`=+FD  
5Pmmt&#/Z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VB6EM|bphl  
 //{{AFX_MSG_MAP(CAboutDlg) ! K? o H  
 // No message handlers v%Rc wVt|  
 //}}AFX_MSG_MAP q~*3Bk~  
END_MESSAGE_MAP() tln*Baq  
&8!* u3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BM bT:)%  
: CDialog(CCaptureDlg::IDD, pParent) "=)i'x"0"  
{ 2yqm$i9C  
 //{{AFX_DATA_INIT(CCaptureDlg) {2kw*^,l  
  m_bControl = FALSE; jxA`RSY  
  m_bAlt = FALSE; 2`4'Y.Qf  
  m_bShift = FALSE; ca>6r`  
  m_Path = _T("c:\\"); ,a_F[uK  
  m_Number = _T("0 picture captured."); G<.p".o4  
  nCount=0; ydp?%RB3w  
  bRegistered=FALSE; (WT0 j  
  bTray=FALSE; 9( ;lcOz  
 //}}AFX_DATA_INIT 9G(.=aOj,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 I!bzvPJ]xc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0:-i  
} oQJK}9QR  
R03V+t=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S-[]z*  
{ U85t !U  
 CDialog::DoDataExchange(pDX); $-""=O|"   
 //{{AFX_DATA_MAP(CCaptureDlg) +gb2>fei&  
  DDX_Control(pDX, IDC_KEY, m_Key); }N; c  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $I(2}u?1+d  
  DDX_Check(pDX, IDC_ALT, m_bAlt); z,XM|-"#<K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `X?l`H;#  
  DDX_Text(pDX, IDC_PATH, m_Path); x9r5 ;5TI  
  DDX_Text(pDX, IDC_NUMBER, m_Number); vPuPSE%M  
 //}}AFX_DATA_MAP N*JWd  
} )mO|1IDTN  
<Q)6N!Tp^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,lm.~%}P*  
//{{AFX_MSG_MAP(CCaptureDlg) =]x FHw8A  
 ON_WM_SYSCOMMAND() "El$Sat`  
 ON_WM_PAINT() *,1^{mb  
 ON_WM_QUERYDRAGICON() !?B9 0(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^!^8]u<Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4&/u1u 0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Pz3jc|Ga  
//}}AFX_MSG_MAP Mj5=t:MI  
END_MESSAGE_MAP() jTk !wm=  
aE.T%xR  
BOOL CCaptureDlg::OnInitDialog() +GMM&6<  
{ ==I:>+_ ^|  
 CDialog::OnInitDialog();  8YFfnk  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |;{^Mci%  
 ASSERT(IDM_ABOUTBOX < 0xF000); hBDPz1<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }_}C ^  
 if (pSysMenu != NULL) Z QND^a:  
 { sAS\-c'6  
  CString strAboutMenu; R(@7$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); bnLvJ]i)  
  if (!strAboutMenu.IsEmpty()) <jU[&~p  
  { msg&~" Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); @u3K.}i:g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); esmQ\QQ^1  
  } OtJYr1:y_  
 } Sai_rNRWB  
 SetIcon(m_hIcon, TRUE); // Set big icon uc~PKU?tO  
 SetIcon(m_hIcon, FALSE); // Set small icon F>&Q5Kl R  
 m_Key.SetCurSel(0); oH!sJ&"#_  
 RegisterHotkey(); f33'2PYl  
 CMenu* pMenu=GetSystemMenu(FALSE); )K>XLaG)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ("o <D{A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yyxGVfr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "?lirOD  
 return TRUE; // return TRUE unless you set the focus to a control 34U/"+|z  
} -QCo]:cp  
#wbaRx@rc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Fgxh?Wd9  
{ hFuS>Hx  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~ C6< 75  
 { C,z7f"  
  CAboutDlg dlgAbout; xRv1zHZ  
  dlgAbout.DoModal(); Zu$f-_"  
 } :?RooJ~#  
 else Fng":28o  
 { 7_E+y$i=  
  CDialog::OnSysCommand(nID, lParam); Y%^&aacZ  
 } >H ic tH  
} :&2RV_$>=  
aP cO9  
void CCaptureDlg::OnPaint() s)375jCga  
{ QD+dP nZu  
 if (IsIconic()) Y_p   
 { l#~Sh3@L(  
  CPaintDC dc(this); // device context for painting _Y|k \|'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Nq9Qsia&  
  // Center icon in client rectangle UB.FX  
  int cxIcon = GetSystemMetrics(SM_CXICON); n4>  
  int cyIcon = GetSystemMetrics(SM_CYICON); 8s?;<6  
  CRect rect; }-V .upl  
  GetClientRect(&rect); <Sm =,Sw  
  int x = (rect.Width() - cxIcon + 1) / 2; fk*JoR.o  
  int y = (rect.Height() - cyIcon + 1) / 2; ~b3xn T  
  // Draw the icon @K4} cP  
  dc.DrawIcon(x, y, m_hIcon); lLmVat(  
 } viD+~j18  
 else D4Uz@2_  
 { z\_q`43U7  
  CDialog::OnPaint(); 5>KAVtYvc  
 } e~'y%|D  
} ]=WJ%p1l  
 O7s0M?4  
HCURSOR CCaptureDlg::OnQueryDragIcon() Tl8S|Rg  
{ Hi,_qlc+  
 return (HCURSOR) m_hIcon; +]I;C  
} u5V<f;  
Arir=q^2  
void CCaptureDlg::OnCancel() 9^v|~f  
{ U6jlv3  
 if(bTray) 6\4oHRJC  
  DeleteIcon(); s3g$F23  
  CDialog::OnCancel(); |A'8'z&q  
} XLqS{r~?  
MukPY2[Am  
void CCaptureDlg::OnAbout() >p\IC  
{ %j2YCV7  
 CAboutDlg dlg; *3S,XMS{O  
 dlg.DoModal(); lk6mu  
} S;+bQ.  
(}4tj4d  
void CCaptureDlg::OnBrowse() 6by5VESx  
{ _m3PAD4  
 CString str; %?X~,  
 BROWSEINFO bi; \ts:'  
 char name[MAX_PATH]; b'M g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); cFGP3Q4{  
 bi.hwndOwner=GetSafeHwnd(); ZS>}NN  
 bi.pszDisplayName=name; zhHQJcQ.  
 bi.lpszTitle="Select folder"; MCL?J,1?r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; J^n(WnM*F  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); E^A9u |x  
 if(idl==NULL) COJqVC(#  
  return; lsJ'dS  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {(ey!O  
 str.ReleaseBuffer(); ],qG!,V  
 m_Path=str; RBt"7'  
 if(str.GetAt(str.GetLength()-1)!='\\') lG%oqxJ+ L  
  m_Path+="\\"; +;:i,`Lmg  
 UpdateData(FALSE); n U$Lp`  
} )l[ +7  
:!g|0CF_  
void CCaptureDlg::SaveBmp() Wj.)wr!  
{ `5[VO  
 CDC dc; y ?4|jN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); W`6nMFg  
 CBitmap bm; lQi2ym?  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9e=F  
 int Height=GetSystemMetrics(SM_CYSCREEN); {< jLfL1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .LnXKRd{  
 CDC tdc; Yfxc$ub  
 tdc.CreateCompatibleDC(&dc); #3kR}Amow  
 CBitmap*pOld=tdc.SelectObject(&bm); 5xTm]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VI" ,E}  
 tdc.SelectObject(pOld); $'?CY)h{  
 BITMAP btm; |],{kUIXO  
 bm.GetBitmap(&btm); t8]u#bx"?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4?jhZLBU  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); HmbTV(lC  
 BITMAPINFOHEADER bih; =Q3Go8b4HJ  
 bih.biBitCount=btm.bmBitsPixel; .? !{.D  
 bih.biClrImportant=0; Fypqf|  
 bih.biClrUsed=0; uZd)o AB  
 bih.biCompression=0; ,dZ 9=]  
 bih.biHeight=btm.bmHeight; >=C)\Yfu)  
 bih.biPlanes=1; tQo"$ JN}  
 bih.biSize=sizeof(BITMAPINFOHEADER); P63z8^y  
 bih.biSizeImage=size; ;bP7|  
 bih.biWidth=btm.bmWidth; ~NU~jmT2  
 bih.biXPelsPerMeter=0; +-qD!(&-6  
 bih.biYPelsPerMeter=0; d 'x;]#S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Dih~5  
 static int filecount=0; /~g M,*  
 CString name; OK3B6T5w=  
 name.Format("pict%04d.bmp",filecount++); *DDfdn  
 name=m_Path+name; ^4 es  
 BITMAPFILEHEADER bfh; 8'`&f &  
 bfh.bfReserved1=bfh.bfReserved2=0; Y<a/(`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); c{||l+B  
 bfh.bfSize=54+size; .(1=iL_3e  
 bfh.bfOffBits=54; }Z0)FU +  
 CFile bf; Z PZ1 7-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ F^A1'J  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Haq23K  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .Ddl.9p5  
  bf.WriteHuge(lpData,size); F^`sIrZvs  
  bf.Close(); pxDZ}4mOh  
  nCount++; d=lZhqY  
 } &W.tjqmw  
 GlobalFreePtr(lpData); Y*w< ~m  
 if(nCount==1) %\:.rs^  
  m_Number.Format("%d picture captured.",nCount); 4~Lw:o1a  
 else mN@0lfk;  
  m_Number.Format("%d pictures captured.",nCount); Pw$'TE}  
  UpdateData(FALSE); yKDg ~zsh  
} P d*}0a~  
MzJ5_}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $JX_e  
{ ]*):2%f  
 if(pMsg -> message == WM_KEYDOWN) v[ F_r  
 { QD\S E  
  if(pMsg -> wParam == VK_ESCAPE) {/R4Q1  
   return TRUE; i$%;z~#wW  
  if(pMsg -> wParam == VK_RETURN) w :^b3@gd  
   return TRUE; _|*3uGo:  
 } U$0#j  
 return CDialog::PreTranslateMessage(pMsg); b3Y9  
} DPy"FQYZb  
H Qf[T@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C_'Ug  
{ BT`/O D@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ce+\D'q[  
  SaveBmp(); mnu7Y([2>  
  return FALSE; %v}:#_va]  
} p?Yovckm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I:mJWe  
 CMenu pop; puMpUY  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kw=+"U   
 CMenu*pMenu=pop.GetSubMenu(0); go{'mX)}u  
 pMenu->SetDefaultItem(ID_EXITICON); N15{7 ,   
 CPoint pt; B;G|2um:$  
 GetCursorPos(&pt); E\RQm}Z09  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wXNFL9F8  
 if(id==ID_EXITICON) z KJ6j]m  
  DeleteIcon(); L & PhABZ  
 else if(id==ID_EXIT) Fnll&TF  
  OnCancel(); )5yZSdA  
 return FALSE; 7 NJ1cQ-}t  
} -Frx{3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $:mCyP<y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =A=er1~%  
 AddIcon(); ! daXF&q  
 return res; ,h>0k`J:a  
} ChmPO|2F  
7i 6-Hq  
void CCaptureDlg::AddIcon() h-jea1m  
{ t3U*rr|A  
 NOTIFYICONDATA data; 6ng . =  
 data.cbSize=sizeof(NOTIFYICONDATA); Z8nNZ<k  
 CString tip; `wk#5[Y_  
 tip.LoadString(IDS_ICONTIP); Y Xn)?  
 data.hIcon=GetIcon(0); .sjM$#V=  
 data.hWnd=GetSafeHwnd(); ? )0U!)tK  
 strcpy(data.szTip,tip); y4M<L. RO  
 data.uCallbackMessage=IDM_SHELL; })T_D\2M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?~u"w OH'  
 data.uID=98; ~}wPiu,  
 Shell_NotifyIcon(NIM_ADD,&data); 8 +uOYNXsA  
 ShowWindow(SW_HIDE); /r}t  
 bTray=TRUE; PtmdUHvD  
} 3haY{CEr  
xN2{Vi{ad  
void CCaptureDlg::DeleteIcon() ,bJZs-P0  
{ e2/&X;2  
 NOTIFYICONDATA data; l+YpRx/T\  
 data.cbSize=sizeof(NOTIFYICONDATA); {kW!|h&'  
 data.hWnd=GetSafeHwnd(); $WTu7lVV[1  
 data.uID=98; &o:ZOD.  
 Shell_NotifyIcon(NIM_DELETE,&data); ;:"~utL7  
 ShowWindow(SW_SHOW); f9OVylm  
 SetForegroundWindow(); oPre$YT}h  
 ShowWindow(SW_SHOWNORMAL); 6RzTSb  
 bTray=FALSE; rmWG9&coW  
} ;~/  
#lV&U  
void CCaptureDlg::OnChange() 183'1Z$KA  
{ .hT^7|Jz[  
 RegisterHotkey(); hQHV]xW  
} ^R K[-tVV  
SU H^]4>  
BOOL CCaptureDlg::RegisterHotkey() .}a@OLJd  
{ B;?a. 81~  
 UpdateData(); .Jou09+  
 UCHAR mask=0; NIV&)`w  
 UCHAR key=0; ?uh7m 2l0D  
 if(m_bControl) MZ% P(5  
  mask|=4; s g6  
 if(m_bAlt) <0&];5 on  
  mask|=2; Z>Sv[Ec  
 if(m_bShift) sowkxw.^Q  
  mask|=1; I /> .P  
  key=Key_Table[m_Key.GetCurSel()]; Lqwc:%Y:_  
 if(bRegistered){ ?t?!)#X  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !aIIjWz]  
  bRegistered=FALSE; }ZR3  
 } 7!L"ef62o  
 cMask=mask; Lo9+#ITyx  
 cKey=key; kO/dZ%vj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]FsPlxk6  
 return bRegistered; ii{5z;I]X  
} W)j/[  
=`.9V<  
  四、小结 F<G.!Y8!&  
<qv:7@  
  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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