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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: lH`TF_  
  J<+ f7L  
  一、实现方法 2aCf?l(  
jk&xzJH.  
  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: gN />y1{a  
wEM=Tr/h  
#pragma data_seg("shareddata") YPI,u7-  
HHOOK hHook =NULL; //钩子句柄 qe#5;#  
UINT nHookCount =0; //挂接的程序数目 GJZjQH-#P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 bY.VNA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #@OPi6.#!<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey GW'v\O  
static int KeyCount =0; +pme]V|<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 G\BZ^SwE  
#pragma data_seg() QEf@wv;T  
-*4*hHmb  
  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。 Ms,MXJtH  
dt:$:,"   
  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: nOL.%  
r9&m^,U  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR yD7}  
cKey,UCHAR cMask) kMurNA=  
{ tF} ^  
 BOOL bAdded=FALSE; F/BR#J1  
 for(int index=0;index<MAX_KEY;index++){ }R#W<4:  
  if(hCallWnd[index]==0){ Ve|:k5z  
   hCallWnd[index]=hWnd; f0 sGE5  
   HotKey[index]=cKey; "E\mj'k  
   HotKeyMask[index]=cMask; .gDq+~r8O  
   bAdded=TRUE; $Q8 &TM}E  
   KeyCount++; 5[SwF& zZ  
   break; S Dil\x  
  } ebI2gEu;a  
 } >*h+ N? m  
 return bAdded; `8W HVC$  
} O1\Hx8^  
//删除热键 [z2UfHpt~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _ C?Wk:Y@  
{ i cTpx#|=  
 BOOL bRemoved=FALSE; MXcW & b  
 for(int index=0;index<MAX_KEY;index++){ x+Xd7N1  
  if(hCallWnd[index]==hWnd){ XP?jsBE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0?>(H(D^/  
    hCallWnd[index]=NULL; zq{UkoME  
    HotKey[index]=0; I_v}}h{  
    HotKeyMask[index]=0; &N/t%q  
    bRemoved=TRUE; ?=M ?v;8  
    KeyCount--; 4)8VmCW  
    break; A)sYde(  
   } {m>ylE  
  } kaekH*m~  
 } D;V[9E=g/  
 return bRemoved; 6EyPZ{  
} ZK^cG'^2|  
rl%,9JD!  
&R<aRE:+R  
  DLL中的钩子函数如下: @!f4>iUy  
NgGMsE\C}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q%d G>!  
{   < v]  
 BOOL bProcessed=FALSE; p 4> ThpX  
 if(HC_ACTION==nCode) 70c]|5  
 { lJu^Bcrv  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ( 4L/I  
   switch(wParam) BM,hcT r?  
   {  v{a%TA9-  
    case VK_MENU: Q!1;xw~  
     MaskBits&=~ALTBIT; WZNq!K H  
     break; &[-(=43@  
    case VK_CONTROL: xeU|5-d'  
     MaskBits&=~CTRLBIT; ,O5X80'.g  
     break; yKV{V?h?  
    case VK_SHIFT: . |T=T0^  
     MaskBits&=~SHIFTBIT; B]"`}jn  
     break; ^_bG{du  
    default: //judge the key and send message `sCaGCp  
     break; ,-y9P  
   } V[nPTYO4  
   for(int index=0;index<MAX_KEY;index++){ g;63$_<  
    if(hCallWnd[index]==NULL) T(7`$<TQ  
     continue; w I_@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QE(.w dHP  
    { mgjJNzclL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); eTx9fx w  
     bProcessed=TRUE; ux&"TkEp  
    } W%g*sc*+  
   } I1E9E$m5\<  
  } .Az36wD  
  else if((lParam&0xc000ffff)==1){ //有键按下 E?XaU~cpc  
   switch(wParam) QPx5`{nN  
   { %vJHr!x  
    case VK_MENU: 46A sD  
     MaskBits|=ALTBIT; Sr aZxuPg>  
     break; qLDj\%~(  
    case VK_CONTROL: +{I_%SsG  
     MaskBits|=CTRLBIT; `uMEK>b  
     break; k <oB9J  
    case VK_SHIFT: |NfFe*q0;8  
     MaskBits|=SHIFTBIT; ^Qs}2%  
     break; '9V/w[mI  
    default: //judge the key and send message Q4"\k. ?  
     break; < xy@%  
   } q`<:CfCt  
   for(int index=0;index<MAX_KEY;index++){ P9cx&Hk9  
    if(hCallWnd[index]==NULL) 2^WJ1: A  
     continue; d+JK")$9C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l'+3 6  
    { 'c s(gc 0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j?.F-ar  
     bProcessed=TRUE; YvU%OO-+,  
    } xPm. TPj  
   } fc9;ZX7  
  } Ap dXsL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R{#< NE  
   for(int index=0;index<MAX_KEY;index++){ l$;"yVdks  
    if(hCallWnd[index]==NULL) {[o NUzcd  
     continue; ff#7}9_mh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \Z]+j@9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X8|H5Y:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pr0X7 #_E5  
   } .{1$;K @  
  } H`JFXMa<  
 } b' o]Y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x o"GNFh!  
} ZLkl:'E_  
DK4yAR,g  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 1X?ro;  
.Mq#88o.*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &K9;GZS?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &uNec( c  
_ .vG)  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: } !m43x/&  
o^"+X7)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  q#K{~:  
{ -N45ni87  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w+br)  
 { gmL~n7m:K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E`IXBI  
  SaveBmp(); Vm[Rp, "  
  return FALSE; .a*?Pal@@  
 } U: 9&0`k(  
 …… //其它处理及默认处理 ,MY7h 8V/  
} %6m/ve  
uwNJM  
|#TU"$;  
  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。 @?,x3\N-  
8 1,N92T5  
  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。 ZoG@"vr2  
9c>i>Vja!  
  二、编程步骤 zwfft  
HXLnjXoe  
  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"; 6>vR5pn  
sf> E  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;  >G]JwO  
Ebnb-Lze,  
  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; 7H6Ts8^S  
UUt"8]@[  
  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; yZleots1  
e=sc$1|4=  
  5、 添加代码,编译运行程序。 mxv ?PP  
}je<^]a  
三、程序代码 .p#kW:zspA  
]*2),H1 c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c#OxI*,+/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ? x%s j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b;i*}4h!  
#if _MSC_VER > 1000 jB LTEb  
#pragma once 22l'kvo4"  
#endif // _MSC_VER > 1000 72<9xNcB!}  
#ifndef __AFXWIN_H__ x5lVb$!G  
#error include 'stdafx.h' before including this file for PCH Fy=GU<&AI  
#endif EmNVQ1w  
#include "resource.h" // main symbols Za|7gt];l  
class CHookApp : public CWinApp q*hn5K*  
{ m06'T2I  
 public: VI! \+A  
  CHookApp(); V._-iw]v  
  // Overrides 9 [eiN  
  // ClassWizard generated virtual function overrides $@AJg  
  //{{AFX_VIRTUAL(CHookApp) yzS]FwW7  
 public: *6s_7{;  
  virtual BOOL InitInstance(); {*_Ln  
  virtual int ExitInstance(); (}A$4?  
  //}}AFX_VIRTUAL ,1]UOQ>AP  
  //{{AFX_MSG(CHookApp) '}OdF*L  
  // NOTE - the ClassWizard will add and remove member functions here. X5)D[aE6  
  // DO NOT EDIT what you see in these blocks of generated code ! 529; _|  
  //}}AFX_MSG K; #FU  
  DECLARE_MESSAGE_MAP() m<gdyY   
}; }+,Q&]>~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W|PAI [N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BtJkvg(2]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l)u%`Hcn  
BOOL InitHotkey(); |IAx!Z-P  
BOOL UnInit(); ndSu-8?L  
#endif E>fY,*0  
nW=6nCyvo  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. x;mw?B[  
#include "stdafx.h" 9{pT)(Wnb  
#include "hook.h" 8lF9LZ8  
#include <windowsx.h> )~'UJPK  
#ifdef _DEBUG mR0`wrt  
#define new DEBUG_NEW !?,, ZD  
#undef THIS_FILE 7K"3[.  
static char THIS_FILE[] = __FILE__; z teu{0  
#endif ]3,'U(!+  
#define MAX_KEY 100 d6i}xnmC  
#define CTRLBIT 0x04 EjPR+m  
#define ALTBIT 0x02  ][ $UN  
#define SHIFTBIT 0x01 S>lP?2J  
#pragma data_seg("shareddata") *l7 `C)  
HHOOK hHook =NULL; P]+B}))  
UINT nHookCount =0; `,O7S9]R+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {z oGwB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6#=Iv X4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "im5Fnu  
static int KeyCount =0;  exWQ~&  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1j2U,_-  
#pragma data_seg() S'x ]c#  
HINSTANCE hins; rJ /HIda  
void VerifyWindow(); VwR\"8r3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !}=eXDn;A_  
//{{AFX_MSG_MAP(CHookApp) XT^=v6^H  
// NOTE - the ClassWizard will add and remove mapping macros here. ]}`t~#Irz  
// DO NOT EDIT what you see in these blocks of generated code! -jjB2xP  
//}}AFX_MSG_MAP 8:Hh;nl  
END_MESSAGE_MAP() 5OdsT-y  
i4YskhT  
CHookApp::CHookApp() r/h\>s+N  
{ }s2CND  
 // TODO: add construction code here, :(q4y-o6  
 // Place all significant initialization in InitInstance W6?=9].gc  
} |gkNhxzB  
<:-4GJH=  
CHookApp theApp; zC*FeqFL<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7FwtBO  
{ ".jO2GO^  
 BOOL bProcessed=FALSE; `0upm%A  
 if(HC_ACTION==nCode) WsTIdr36x  
 { O_ #++G  
  if((lParam&0xc0000000)==0xc0000000){// Key up v&:[?<6-  
   switch(wParam) 'D W|a  
   { g}~s"Sz  
    case VK_MENU: bK "I9T #  
     MaskBits&=~ALTBIT; DY`0 `T  
     break; 3Ei^WDJ  
    case VK_CONTROL: W[jg+|  
     MaskBits&=~CTRLBIT; 0\i\G|5  
     break; 6jpzyf=~  
    case VK_SHIFT: &>-'|(m+2  
     MaskBits&=~SHIFTBIT; u^Cl s!C  
     break; tM LiG4 |7  
    default: //judge the key and send message g9C-!X-<T  
     break; - ~z@W3\  
   } T4x%3-4 ;  
   for(int index=0;index<MAX_KEY;index++){ .XgY&5Qk  
    if(hCallWnd[index]==NULL) wPU5L*/*i  
     continue; Y6wr}U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $mxG-'x%K  
    { :{<|,3oNdR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q & /5B  
     bProcessed=TRUE; c@>ztQU*  
    } KXMf2)pa  
   } Lginps[la  
  } .*NPoW4Kv  
  else if((lParam&0xc000ffff)==1){ //Key down -3(*4)h7  
   switch(wParam) &pK0>2  
   { &zYQ H@  
    case VK_MENU: +1#;s!e  
     MaskBits|=ALTBIT; K^x{rn.Zf  
     break; Bc!<!  
    case VK_CONTROL: c Lyf[z)W  
     MaskBits|=CTRLBIT; *6JA&zj0B  
     break; 3MX#}_7A  
    case VK_SHIFT: pg5W`4-F  
     MaskBits|=SHIFTBIT; {]Mwuqn  
     break; uP4yJ/]  
    default: //judge the key and send message o2|#_tGNUy  
     break; nZiwR4kM  
   } T6y~iNd<  
   for(int index=0;index<MAX_KEY;index++) kRggVRM  
   { [vI ;A !  
    if(hCallWnd[index]==NULL) *v#V%_o  
     continue; :V$\y up  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RH,x);J|  
    { i&(1 <S>P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x7B;\D#`i/  
     bProcessed=TRUE; ebEI%8p g  
    } y?cN  
   } UZsvYy?  
  } F<h+d917  
  if(!bProcessed){ /IcGJ&;  
   for(int index=0;index<MAX_KEY;index++){ 1z|bQ,5  
    if(hCallWnd[index]==NULL) qAd=i0{N  
     continue; )\D{5j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8 3/WWL }  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #^]vhnbN  
   } j `!Ge  
  } {9{X\|  
 } dR_6j}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NZZy^p&O  
} i5Sya]FN  
HnjA78%i  
BOOL InitHotkey() 9.xRDk  
{ 2 z#S| $  
 if(hHook!=NULL){ ?B e}{Qqlg  
  nHookCount++; EN[T3 Y  
  return TRUE; k{vbi-^6rf  
 } (y6}xOa(  
 else / yBrlf  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :2M&C+f[  
  if(hHook!=NULL) +XO\#$o>W  
   nHookCount++; OE0G*`m  
  return (hHook!=NULL); ;/Z-|+!IJt  
} +a N8l1  
BOOL UnInit() Q~0>GOq*  
{ U+>M@!=  
 if(nHookCount>1){ Nb9GrYIS  
  nHookCount--; pZ \7!rON  
  return TRUE; = &pLlG  
 } N8Zz6{rp  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OqciZ@#5n  
 if(unhooked==TRUE){ =$)M-;6  
  nHookCount=0; #z%D d{E  
  hHook=NULL; jZkc yx  
 } WG6 0  
 return unhooked; 4c(Em+ 4  
} `vOL3`P  
g;p} -=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7p2xst  
{ v ;}s`P\"  
 BOOL bAdded=FALSE; X|Y(*$?D7  
 for(int index=0;index<MAX_KEY;index++){ %EVgSF!r  
  if(hCallWnd[index]==0){ }]mx Kz  
   hCallWnd[index]=hWnd; ~I+MuI[  
   HotKey[index]=cKey; 3Y2~HuM  
   HotKeyMask[index]=cMask; 2 HQ3G~U  
   bAdded=TRUE; HW~-GcU-o  
   KeyCount++; : (X3?%  
   break; =iKl<CqI$E  
  } lcm [l  
 } io+V4m  
 return bAdded; :[_ms d  
} J,CwC)  
\*e\MOp6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9)'f)60^  
{ -g2l-N{&  
 BOOL bRemoved=FALSE; ZzupK^5Z  
 for(int index=0;index<MAX_KEY;index++){ m]AT-]*f  
  if(hCallWnd[index]==hWnd){ ^ U mYW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gd*Gn"  
    hCallWnd[index]=NULL; Wvr{l  
    HotKey[index]=0; MHK|\Z&e7  
    HotKeyMask[index]=0; kzRJzJquP  
    bRemoved=TRUE; tWIJ,_8l  
    KeyCount--; WrGnLE kiV  
    break; vW=L{8zu  
   } Y!CUUWM  
  } Y"MHs0O5>  
 } MY@&^71i4  
 return bRemoved; }<0N)dpT  
} %A$&9c%  
|R0f--;  
void VerifyWindow() IQ I8 v  
{ R{H[< s+n  
 for(int i=0;i<MAX_KEY;i++){ m|aK_  
  if(hCallWnd!=NULL){ + t5SrO!`  
   if(!IsWindow(hCallWnd)){ K] (*l"'U5  
    hCallWnd=NULL; A#=TR_@:  
    HotKey=0; {p84fR1P  
    HotKeyMask=0; m$W >~  
    KeyCount--; hGz_F/  
   } Ur(R[*2bx  
  } Mqr_w!8d  
 } P0n1I7|  
} G@k]rwub  
DW. w=L|5R  
BOOL CHookApp::InitInstance() \l~^dn}  
{ }5;4'l8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); GJeG7xtJKl  
 hins=AfxGetInstanceHandle(); m4mE7Wn.3  
 InitHotkey(); =nhY;pY3u  
 return CWinApp::InitInstance(); s@F&N9oh  
} $Nu{c;7"  
K./qu^+k  
int CHookApp::ExitInstance() |N)Ik8  
{ p*;!5;OUR  
 VerifyWindow(); ?qgQ)#6  
 UnInit(); =zkN63S  
 return CWinApp::ExitInstance(); 6'^_*n  
} I!lDKS,b  
yHeL&H  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0<,{poMM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V]7/hN-Y}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pY31qhoZ.  
#if _MSC_VER > 1000 & l>nzJ5?  
#pragma once 19E(Hsz  
#endif // _MSC_VER > 1000 ={g)[:(C.  
 LA3m,  
class CCaptureDlg : public CDialog U=Ps#  
{ =:H-9  
 // Construction 4MgN  
 public: fap`;AuwK  
  BOOL bTray; [l}H:%O,  
  BOOL bRegistered; ;uBGB h<  
  BOOL RegisterHotkey(); c!EA>:;(<  
  UCHAR cKey; %*D=ni#(sT  
  UCHAR cMask; nWd!ovd  
  void DeleteIcon(); ] K$YtM^  
  void AddIcon(); jPWONz(#  
  UINT nCount; %e iV^>  
  void SaveBmp(); yXNr[ 7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor irt9%w4"  
  // Dialog Data ]A5F}wV4  
  //{{AFX_DATA(CCaptureDlg) btW#ebm  
  enum { IDD = IDD_CAPTURE_DIALOG }; m{IlRf'  
  CComboBox m_Key; "qmSwdM  
  BOOL m_bControl; zL"e.  
  BOOL m_bAlt; 4Mt3<W5  
  BOOL m_bShift; G5}_NS/  
  CString m_Path; { DYY9MG8  
  CString m_Number; +( LH!\{^  
  //}}AFX_DATA *!QmYH5r0  
  // ClassWizard generated virtual function overrides 5rsz2;#p  
  //{{AFX_VIRTUAL(CCaptureDlg) *AH `ob}  
 public: E !kN h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4C;;V m4~  
 protected: X!KX4H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W@R7CQE@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |"*P`C=  
  //}}AFX_VIRTUAL a%%7Ew ?  
  // Implementation ex>7f%\  
 protected: k4{!h?h  
  HICON m_hIcon; 7y Cf3  
  // Generated message map functions cH_qHXi[G  
  //{{AFX_MSG(CCaptureDlg) bxE~tsM"@Y  
  virtual BOOL OnInitDialog(); b7.7@Ly y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K|%Am4  
  afx_msg void OnPaint(); Snkb^Kt  
  afx_msg HCURSOR OnQueryDragIcon(); [n"eD4)K|  
  virtual void OnCancel(); utck{]P  
  afx_msg void OnAbout(); GCl *x:  
  afx_msg void OnBrowse(); 6,q0F*q  
  afx_msg void OnChange(); tddwnpnSw  
 //}}AFX_MSG <X*oW".  
 DECLARE_MESSAGE_MAP() 0>Y3xNb  
}; -6)nQNj|  
#endif qJG;`Ugl:  
Ta[2uv>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wR_mJMk_  
#include "stdafx.h" 5( <O?#P  
#include "Capture.h" gP>pb W_  
#include "CaptureDlg.h"  ?s,oH  
#include <windowsx.h> lw3H 8[  
#pragma comment(lib,"hook.lib") .=:f]fs  
#ifdef _DEBUG %oiF} >  
#define new DEBUG_NEW f r~Eb'8  
#undef THIS_FILE / =9Y(v  
static char THIS_FILE[] = __FILE__; c#x~x  
#endif jm%P-C @  
#define IDM_SHELL WM_USER+1 t,YRM$P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C]b:#S${  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7c\W&ZEmb-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; faOiNR7;h  
class CAboutDlg : public CDialog -W!M:8  
{ P4B|l:  
 public: $6m@gW]N  
  CAboutDlg(); c&PsT4Wh  
  // Dialog Data 4L>8RiiQE;  
  //{{AFX_DATA(CAboutDlg) eFsl  
  enum { IDD = IDD_ABOUTBOX }; B-g-T>8  
  //}}AFX_DATA UXji$|ET6  
  // ClassWizard generated virtual function overrides )ThNy:4  
  //{{AFX_VIRTUAL(CAboutDlg) Rir0^XqG  
 protected: NrS+N;i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \JPMGcL  
  //}}AFX_VIRTUAL Y nnK]N;\x  
  // Implementation A< .5=E,/  
 protected: yLf9cS6=  
  //{{AFX_MSG(CAboutDlg) :.=:N%3[  
  //}}AFX_MSG qJF'KHyU{l  
  DECLARE_MESSAGE_MAP() Pfs_tu  
}; Q=! lbW  
6<@ mB Z  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^6# yL6E,~  
{ F3V:B.C  
 //{{AFX_DATA_INIT(CAboutDlg) I]n X6=j5  
 //}}AFX_DATA_INIT l\0PwD  
}  MMk9rBf  
(~Bm\Jn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @|;[ ;:h@  
{ cFie;k  
 CDialog::DoDataExchange(pDX); H.M: cD:  
 //{{AFX_DATA_MAP(CAboutDlg) 8;`B3N7  
 //}}AFX_DATA_MAP o#"yFP1  
} #IGcQY  
8\E=p+C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :$VGqvO12W  
 //{{AFX_MSG_MAP(CAboutDlg) c|:EMYS  
 // No message handlers OqsuuE  
 //}}AFX_MSG_MAP el<Gd.p.d  
END_MESSAGE_MAP() rhzI*nwOT  
tYMr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _!|$i  
: CDialog(CCaptureDlg::IDD, pParent) Q(x=;wf5r  
{ fN{wP,jI  
 //{{AFX_DATA_INIT(CCaptureDlg) Q,9KLi3  
  m_bControl = FALSE; "r;cH53  
  m_bAlt = FALSE; I;AS.y  
  m_bShift = FALSE; m; =S]3P*  
  m_Path = _T("c:\\"); )( YJ6l  
  m_Number = _T("0 picture captured."); M`#g>~bI#R  
  nCount=0; `r&Ui%fk;0  
  bRegistered=FALSE; 6(\-aH'Ol  
  bTray=FALSE;  o4 "HE*  
 //}}AFX_DATA_INIT P{s1NorKDh  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yrf?|,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);  S\ZCZ0  
} EhD%  
VwBw!,%Ab  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s(5(zcBK  
{ 6_8yQ  
 CDialog::DoDataExchange(pDX); 6V9r[,n  
 //{{AFX_DATA_MAP(CCaptureDlg) /QlzWson  
  DDX_Control(pDX, IDC_KEY, m_Key); B~Z61   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Grw[h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `{yD\qDyX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); / E!6]b/  
  DDX_Text(pDX, IDC_PATH, m_Path); &9Z@P[f  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l YdATM(h  
 //}}AFX_DATA_MAP Zq: }SU  
} !}`[s2ji  
MjBI1|*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )g&nI <Mh  
//{{AFX_MSG_MAP(CCaptureDlg) j$u  
 ON_WM_SYSCOMMAND() \/wk!mWV@  
 ON_WM_PAINT() B'B0e`  
 ON_WM_QUERYDRAGICON() A[Ce3m  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7k#>$sY+  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -e51 /lhpd  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _=[pW2p  
//}}AFX_MSG_MAP lS2 `#l>  
END_MESSAGE_MAP() +U1fa9NSn  
isnpSN"z  
BOOL CCaptureDlg::OnInitDialog() O#^qd0e'P!  
{ zEE:C|50  
 CDialog::OnInitDialog(); EN>a^B+!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); D+BflI~9mP  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1?TgI0HS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); L]X Lv9J0  
 if (pSysMenu != NULL) *= %`f=  
 { E_z,%aD[  
  CString strAboutMenu; K(NP%:  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wqE2n  
  if (!strAboutMenu.IsEmpty()) $0M7P5]N*G  
  { #)T'a  
   pSysMenu->AppendMenu(MF_SEPARATOR); '7]9q#{su  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1JGww]JZo  
  } ]VN1Y)  
 } ~vZ1.y4  
 SetIcon(m_hIcon, TRUE); // Set big icon ^sJp!hi4=)  
 SetIcon(m_hIcon, FALSE); // Set small icon e 7Sg-NWV  
 m_Key.SetCurSel(0); 4l{La}Aj  
 RegisterHotkey(); x;7p75Wm  
 CMenu* pMenu=GetSystemMenu(FALSE); IxWX2yJ]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "+&@iL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4 tt=u]:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]#rmk!VT?  
 return TRUE; // return TRUE unless you set the focus to a control ;UQ&yj%x  
} ;[,#VtD  
9\r5&#<(I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :r_/mzR#  
{ 5e'**tbKH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tgrZs8?  
 { %A@U7gqc  
  CAboutDlg dlgAbout; - :x6X$=  
  dlgAbout.DoModal(); mndNkK5o  
 } xAf?E%_pi  
 else `LWbL*;Y0  
 { ns[h_g!j;  
  CDialog::OnSysCommand(nID, lParam); |P"kJ45  
 } `]2y=f<{X  
} J s,.$t  
Dd,]Y}P  
void CCaptureDlg::OnPaint() ;uU 8$  
{ )|U+<r<  
 if (IsIconic()) e0o)Jo.P  
 { -fx$)d~  
  CPaintDC dc(this); // device context for painting `9VRT`e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); M0MvOO*ad  
  // Center icon in client rectangle {,o 0N\(  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ar$ Am  
  int cyIcon = GetSystemMetrics(SM_CYICON); K&iU+  
  CRect rect; f@xjNm*'Z  
  GetClientRect(&rect); xNxSgvco ,  
  int x = (rect.Width() - cxIcon + 1) / 2; DIc -"5~  
  int y = (rect.Height() - cyIcon + 1) / 2; /. @"wAw:  
  // Draw the icon flU?6\_UC  
  dc.DrawIcon(x, y, m_hIcon); ]A:G>K  
 } &o)eRcwH`  
 else :\G`}_db'  
 { ncij)7c)u  
  CDialog::OnPaint(); ?xCWg.#l4V  
 } +C[%^G-:  
} ~0gHh  
(yhnv Z  
HCURSOR CCaptureDlg::OnQueryDragIcon() s ` +cQ  
{ #; >v,Jo  
 return (HCURSOR) m_hIcon; "?{=|%mf  
} /.[78:G\,  
Wc{/K6]f  
void CCaptureDlg::OnCancel() XRWy#Pj  
{ A>J,Bi  
 if(bTray) 1ihdH1rg[  
  DeleteIcon(); ,CQg6- [  
  CDialog::OnCancel(); sb*)K,U  
} :pgpE0  
`KmM*_a  
void CCaptureDlg::OnAbout() &^^V*O  
{ R"qxT.P(  
 CAboutDlg dlg; </jTWc'}  
 dlg.DoModal(); !"QvV6Lq\  
} uBfSS\SX|  
#w# :f  
void CCaptureDlg::OnBrowse() PFPZ]XI%F  
{ 'P3jUc)  
 CString str; +I r  
 BROWSEINFO bi; Q}:#H z?U  
 char name[MAX_PATH]; C{U"Nsu+1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0}I aWd^4  
 bi.hwndOwner=GetSafeHwnd(); k^*S3#"  
 bi.pszDisplayName=name; ZA6)@Mn  
 bi.lpszTitle="Select folder"; *'hJ5{U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; XMw*4j2E  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {#4F}@Q  
 if(idl==NULL) R*r;`x  
  return; \d}>@@U&  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8XdgtYm  
 str.ReleaseBuffer(); 6$A>%Jtwe  
 m_Path=str; EK$3T5e  
 if(str.GetAt(str.GetLength()-1)!='\\') g! DJ W  
  m_Path+="\\"; {>n\B~*,"C  
 UpdateData(FALSE); ;HoBLxb P  
} 6#(==}Sm+  
 w0`8el;  
void CCaptureDlg::SaveBmp() &Na,D7A:3I  
{ ~Y/o9x0  
 CDC dc; QSSA)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )uu1AbT +e  
 CBitmap bm; =C 7WQ  
 int Width=GetSystemMetrics(SM_CXSCREEN); dh S7}n  
 int Height=GetSystemMetrics(SM_CYSCREEN); (]N- HN]v  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1V:I }~\  
 CDC tdc; $* hqF1Q  
 tdc.CreateCompatibleDC(&dc); 2R];Pv  
 CBitmap*pOld=tdc.SelectObject(&bm); }ej>uZVe<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dpSNh1  
 tdc.SelectObject(pOld); B nUWg ^E  
 BITMAP btm; ]I'dnd3e  
 bm.GetBitmap(&btm); Ra/Pk G-7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o&ETs)n|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?!HU$>  
 BITMAPINFOHEADER bih; ,=V9 ?  
 bih.biBitCount=btm.bmBitsPixel; '8w>=9Xl  
 bih.biClrImportant=0; cp$GP*{@  
 bih.biClrUsed=0; <\EJ:  
 bih.biCompression=0; ohna1a^  
 bih.biHeight=btm.bmHeight; a(uZ}yS$  
 bih.biPlanes=1; y4)iL?!J~  
 bih.biSize=sizeof(BITMAPINFOHEADER); e2qSU[  
 bih.biSizeImage=size; QTC!vKM  
 bih.biWidth=btm.bmWidth; E.N  
 bih.biXPelsPerMeter=0; QtQbr*q@%  
 bih.biYPelsPerMeter=0; 7!Qu+R  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .F},Z[a&  
 static int filecount=0; f~ wgMp.W0  
 CString name; N@0cn q:"  
 name.Format("pict%04d.bmp",filecount++); ;2P  
 name=m_Path+name; }Xvm( ;  
 BITMAPFILEHEADER bfh; vb6kr?-i*  
 bfh.bfReserved1=bfh.bfReserved2=0; ,&.$r/x|?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); lhC hk7l  
 bfh.bfSize=54+size; QQJf;p7  
 bfh.bfOffBits=54; s  }Ql9  
 CFile bf; TJCE6QG  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3$wK*xK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); % Ai' 6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9l(T>B2a  
  bf.WriteHuge(lpData,size); H*e+ 2  
  bf.Close();  />6ECT  
  nCount++; 0SDnMij&bf  
 } ocu,qL)W  
 GlobalFreePtr(lpData); E>+>!On)b  
 if(nCount==1) ?lML+  
  m_Number.Format("%d picture captured.",nCount); k.z(.uc=  
 else 5|5p -B  
  m_Number.Format("%d pictures captured.",nCount); flT6y-d  
  UpdateData(FALSE); P V:J>!]  
} H@1}_d  
@fb"G4o`:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Re&"Q8I.8  
{ u"4 B5D  
 if(pMsg -> message == WM_KEYDOWN) p6Z|)1O]  
 { tva=DS  
  if(pMsg -> wParam == VK_ESCAPE) wZs 2 aa  
   return TRUE; `BVmuUMm  
  if(pMsg -> wParam == VK_RETURN) MqJ5|C.q  
   return TRUE; m7DKC,  
 } }B a_epM  
 return CDialog::PreTranslateMessage(pMsg); -Caj>K  
} K{{_qFj@<y  
*~>p;*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R<U]"4CBx  
{ a|"Uw `pX+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &7oL2 Wf  
  SaveBmp(); R3;%eyu  
  return FALSE; ZP5 !O[Ut  
} Fj(GyPFG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [orL.D]  
 CMenu pop; a eeor  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |-G2pu;  
 CMenu*pMenu=pop.GetSubMenu(0); nQoQNB  
 pMenu->SetDefaultItem(ID_EXITICON); xhOoZ-  
 CPoint pt; |/vJ+aKq  
 GetCursorPos(&pt); &iVdqr1,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P.qzP/Ny  
 if(id==ID_EXITICON) h='F,r5#2  
  DeleteIcon(); 31@Lr[!  
 else if(id==ID_EXIT) `/ayg:WSU  
  OnCancel();  +l/v`=C  
 return FALSE; 8M@'A5]  
} ~y2zl  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); EgU#r@7I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) qS2Nk.e]o  
 AddIcon(); 4] uj+J  
 return res; P=5+I+  
} _BmObXOp.  
c&!mKMrk  
void CCaptureDlg::AddIcon() > 'hM"4f  
{ ;,C]WZ.w  
 NOTIFYICONDATA data; -g]Rs!w'  
 data.cbSize=sizeof(NOTIFYICONDATA); M[gL7-%w\  
 CString tip; +ti ?7|bK<  
 tip.LoadString(IDS_ICONTIP); U8w_C\Q  
 data.hIcon=GetIcon(0); N);w~)MYh  
 data.hWnd=GetSafeHwnd(); B-R#?Xn:!I  
 strcpy(data.szTip,tip); ~vFa\7sf  
 data.uCallbackMessage=IDM_SHELL; u] };QR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1!~cPD'F  
 data.uID=98; BzP,Tu{,  
 Shell_NotifyIcon(NIM_ADD,&data); AQlB_ @ b  
 ShowWindow(SW_HIDE); %,kP_[!>Q  
 bTray=TRUE; &$F<]]&  
} [d6!  
Z[oEW>_A  
void CCaptureDlg::DeleteIcon() &0Yg:{k$  
{ .$%p0Yx+  
 NOTIFYICONDATA data; DH-M|~.sf^  
 data.cbSize=sizeof(NOTIFYICONDATA); sQvRupYRO  
 data.hWnd=GetSafeHwnd(); !Qe ;oMqy}  
 data.uID=98; h_vT A  
 Shell_NotifyIcon(NIM_DELETE,&data); rp||#v0l!w  
 ShowWindow(SW_SHOW); `}}:9d  
 SetForegroundWindow(); - {QU>`2  
 ShowWindow(SW_SHOWNORMAL); G^~[|a 4`  
 bTray=FALSE; O1J&Lwpk,  
}  5&&4-  
O?JJE8~']  
void CCaptureDlg::OnChange() qN)y-N.LI(  
{ IOcQI:4.`  
 RegisterHotkey(); elOeXYO0  
} H\67Pd(Z6  
G<;~nAo?f0  
BOOL CCaptureDlg::RegisterHotkey() W)In.?>]W  
{ z-5`6aE9<  
 UpdateData(); &A QqI  
 UCHAR mask=0; z)qYW6o%  
 UCHAR key=0; WQK<z!W5  
 if(m_bControl) $KiCs]I+  
  mask|=4; ,c p2Fac  
 if(m_bAlt) 0 &zp  
  mask|=2; ~[g(@Xt  
 if(m_bShift) <v_=k],W  
  mask|=1; )'_[R@ThB  
  key=Key_Table[m_Key.GetCurSel()]; >cu%Cs=m  
 if(bRegistered){ q$Gs;gz^(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KA5)]UF`l  
  bRegistered=FALSE; t]yxLl\  
 } 8i#  
 cMask=mask; BU O5g8m{  
 cKey=key; (vs<Fo|]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?\}Gi(VVE  
 return bRegistered; :!`"GaTy  
} MMM tB6  
25Dl4<-Z  
  四、小结 b_0THy.Z  
I{Zb/}k-  
  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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