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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: V/d/L3p  
  }n_p$g[Nj/  
  一、实现方法 ;Q;[*B=kE  
l_tw<`Ep  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: %V`F!D<D  
#H?t!DU  
#pragma data_seg("shareddata") !$;a[Te  
HHOOK hHook =NULL; //钩子句柄 YgUH'P-  
UINT nHookCount =0; //挂接的程序数目 *l+OlQI0+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B/JO~;{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 -t2T(ha  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "9EE1];NT  
static int KeyCount =0; *OJ/V O  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -|k)tvAm  
#pragma data_seg() LQ11ba  
WtulTAfN  
  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。 [#Lc]$  
#11NPo9  
  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: eN? Y7  
TL$EV>Nr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7hW+T7u?  
cKey,UCHAR cMask) ._w8J"E5  
{ =L|tp%!  
 BOOL bAdded=FALSE; J_;N:7'p  
 for(int index=0;index<MAX_KEY;index++){ aNn"X y\ k  
  if(hCallWnd[index]==0){ /M;#_+VK<  
   hCallWnd[index]=hWnd; aI(7nJ=R  
   HotKey[index]=cKey; 8$s9(n-_Y  
   HotKeyMask[index]=cMask; UJfT!==U  
   bAdded=TRUE; >d"3<S ; b  
   KeyCount++; n\Fp[9+Z\  
   break; &AVpLf:?  
  } Aa0b6?Jm  
 } wbDM5%  
 return bAdded; FLg*R/  
} Z/x*Y#0@n  
//删除热键 f<=Fsl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p.}Ls)I  
{ ]5~s "fnG  
 BOOL bRemoved=FALSE; \!IMaB]  
 for(int index=0;index<MAX_KEY;index++){ _lzyMEdr  
  if(hCallWnd[index]==hWnd){ LMi:%i%\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9a\nszwa  
    hCallWnd[index]=NULL; JO=[YoTr  
    HotKey[index]=0; |(m oWY=  
    HotKeyMask[index]=0; 2?m.45`  
    bRemoved=TRUE; :j|IP)-f  
    KeyCount--; gqXS~K9t  
    break; 2!&&|Mh}  
   } j'[m:/  
  } ^ -FX  
 } gBT2)2]  
 return bRemoved; 7n]65].t  
} I;5R2" 3  
8[r9HC  
)jWO P,|  
  DLL中的钩子函数如下: [7(-T?_  
j!7`]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D=:04V}2+  
{ !D!~ ^\  
 BOOL bProcessed=FALSE; hA\K</h.  
 if(HC_ACTION==nCode) [."[pY  
 { `V)Z)uN{0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 pa}*E  
   switch(wParam) Z_\C*^  
   {  ?JL7=o X  
    case VK_MENU: J=.`wZQkS  
     MaskBits&=~ALTBIT; y_xnai  
     break; u%'\UmE w  
    case VK_CONTROL: .2J L$"  
     MaskBits&=~CTRLBIT; VMoSLFp^R  
     break; jx acg^c  
    case VK_SHIFT: v]__%_  
     MaskBits&=~SHIFTBIT; ?+T^O?r|O  
     break; >]o}}KF?  
    default: //judge the key and send message .0R v(Y  
     break; s2j['g5  
   } ngj,x7t  
   for(int index=0;index<MAX_KEY;index++){ )%!XSsY.N|  
    if(hCallWnd[index]==NULL) u?s VcD[  
     continue; ng:Q1Q9N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wts=[U`(  
    { uEc<}pV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); - 0?^#G}3}  
     bProcessed=TRUE; GUslPnG  
    } cb5,P~/q  
   } 52upoU>}2  
  } [ sd;`xk  
  else if((lParam&0xc000ffff)==1){ //有键按下 qj cp65^  
   switch(wParam) =^ T\Xs;GK  
   { P{Q=mEQ  
    case VK_MENU: FKe,qTqa  
     MaskBits|=ALTBIT; s;UH]  
     break; PRNoqi3sY  
    case VK_CONTROL: ~ %B<  
     MaskBits|=CTRLBIT; ]Qm]I1P  
     break; @ 49nJi  
    case VK_SHIFT: fDx9iHGv  
     MaskBits|=SHIFTBIT; Mi~(aah  
     break; eT2*W$  
    default: //judge the key and send message qRbf2;  
     break; h*u`X>!!  
   } ;gC|  
   for(int index=0;index<MAX_KEY;index++){ fwzb!"!.@  
    if(hCallWnd[index]==NULL) V.wqZ {G  
     continue; 64:fs?H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) mo~*C   
    { p}[zt#v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =_YG#yS  
     bProcessed=TRUE; 0ZQ'_g|%  
    } $=?@*p  
   } [pVamE  
  } $ cj>2.   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `K ,1K  
   for(int index=0;index<MAX_KEY;index++){ G\NPV'  
    if(hCallWnd[index]==NULL)  *.)tG  
     continue; ^&g=u5 d0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wcDRH)AW.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !bV5Sr^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 u{["50~  
   } ] }f9JNf$  
  } Pz$R(TV  
 } y\{%\$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ax 41N25  
} DNP13wp@  
C* nB  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: }MUn/ [x  
gk`zA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +**!@uY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '=P7""mN5  
%,ngRYxT#  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Le%Z V%,  
BL&LeSa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KD^N)&k^Kp  
{ k%^lF?_0I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ytNO*XoR  
 { &HSq(te  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 vzmc}y G  
  SaveBmp(); x`6<m!d`  
  return FALSE; ]vuwkn+)  
 } r_;9' #&'  
 …… //其它处理及默认处理 /rSH"$  
} Ks}Xgc\  
TwgrRtj'  
F`9]=T0  
  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。 U!Ek'  
H:"ma S\I  
  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。 =N 5z@;!  
1!>Jpi0  
  二、编程步骤 2h%z ("3/  
@O[5M2|r  
  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"; N]RZbzK_5G  
=Fdg/X1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; @Vu(XG  
~H!S,"n^,P  
  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; "+unS)M;Y  
N<DGw?Rl  
  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; \(%Y%?dy  
'? jlH0;  
  5、 添加代码,编译运行程序。 )XWP\ h  
|.wEm;Bz  
三、程序代码 DfKr[cqLM  
`7H4Y&E  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]n-:Yv5 W  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9Vf1Xz  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o: ;"w"G  
#if _MSC_VER > 1000 0 Us5  
#pragma once zz& ?{vJ  
#endif // _MSC_VER > 1000 +E1h#cc)  
#ifndef __AFXWIN_H__ @/ k@WhFZ  
#error include 'stdafx.h' before including this file for PCH Onwp-!!.  
#endif  @Pt="*g  
#include "resource.h" // main symbols GH[wv<  
class CHookApp : public CWinApp \m1~jMz*>k  
{ 6"}?.E$  
 public: be +4junf  
  CHookApp(); %RDI!e<e}  
  // Overrides P 3'O/!  
  // ClassWizard generated virtual function overrides x.q+uU$^  
  //{{AFX_VIRTUAL(CHookApp) )&!&AlLn  
 public: ?Ae ve n  
  virtual BOOL InitInstance(); 4rrSb*  
  virtual int ExitInstance(); /d%=E  
  //}}AFX_VIRTUAL >KJ+-QuO&  
  //{{AFX_MSG(CHookApp) ) Yd?m0m*  
  // NOTE - the ClassWizard will add and remove member functions here. r\/+Oa'  
  // DO NOT EDIT what you see in these blocks of generated code ! v,ju!I0.  
  //}}AFX_MSG F+u|HiYG  
  DECLARE_MESSAGE_MAP() ,{c?ymw?  
}; ^_m9KA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); YY!Rz[/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 71\xCSI1w&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4t)/  
BOOL InitHotkey(); ~ yX2\i"  
BOOL UnInit(); KGg3 !jY  
#endif e;(0(rI  
y99mC$"Ee`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. )P+7PhE{J  
#include "stdafx.h" !50[z:  
#include "hook.h" & \f{E\A#  
#include <windowsx.h> [Vma^B$7Vj  
#ifdef _DEBUG ,{mCf ^  
#define new DEBUG_NEW ?Ec7" hK  
#undef THIS_FILE )Eo)t>  
static char THIS_FILE[] = __FILE__; K>{T_){  
#endif `*shF9.\C  
#define MAX_KEY 100 :ijAqfX  
#define CTRLBIT 0x04 " W|%~h  
#define ALTBIT 0x02 87YyDWTn  
#define SHIFTBIT 0x01 )+6MK(<"  
#pragma data_seg("shareddata") ->V<DZK  
HHOOK hHook =NULL; =&:Y6XP  
UINT nHookCount =0; Ywwu0.H<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey '  <=+;q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?5 {>;#0Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :eCU/BC4  
static int KeyCount =0; gN"7be&J  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o !U 6?  
#pragma data_seg() }B1!gz$YNO  
HINSTANCE hins; Ct>GYk$  
void VerifyWindow(); UNBH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) HZ:6zH   
//{{AFX_MSG_MAP(CHookApp) g?ULWeZg5  
// NOTE - the ClassWizard will add and remove mapping macros here. _D+J!f^  
// DO NOT EDIT what you see in these blocks of generated code! ^cuc.g)c$?  
//}}AFX_MSG_MAP d}4Y(   
END_MESSAGE_MAP() ZEx}$<)_  
% S os  
CHookApp::CHookApp() <q@a~'Ai?!  
{ sL$:"=  
 // TODO: add construction code here, )<tI!I][j  
 // Place all significant initialization in InitInstance zld#qG6  
} c.e2M/  
@ rc{SB  
CHookApp theApp; %B.yW`,X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) HKUn`ng  
{ b"{'T]"*j  
 BOOL bProcessed=FALSE; N=7pK&NHSG  
 if(HC_ACTION==nCode) #n8IZ3+  
 { &*aIEa^  
  if((lParam&0xc0000000)==0xc0000000){// Key up w}YlVete  
   switch(wParam) Nb'''W-iu  
   { H|HYo\@F#  
    case VK_MENU: av|g}xnj  
     MaskBits&=~ALTBIT; ?snp8W-WB  
     break; \}|o1Xh2  
    case VK_CONTROL: Sxh]R+Xb  
     MaskBits&=~CTRLBIT; |0f>aZ  
     break; r<d_[?1N  
    case VK_SHIFT: jIyB  
     MaskBits&=~SHIFTBIT; mUik A9u5=  
     break; "L&#lfOKG  
    default: //judge the key and send message /PSd9N*=y  
     break; ?BZPwGMs  
   } I<6P;  
   for(int index=0;index<MAX_KEY;index++){ j=r P:#  
    if(hCallWnd[index]==NULL) @pRlxkvV  
     continue; ][p>Y>:b-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *(T:,PY  
    { /$p6'1P8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dx@-/^.  
     bProcessed=TRUE; m()RU"WY  
    } 2HsLc*9{4  
   } (bH`x]h#  
  } gq'Y!BBQy  
  else if((lParam&0xc000ffff)==1){ //Key down y1+*6|  
   switch(wParam) z?*w8kU&>  
   { 7\s"o&G  
    case VK_MENU: >]vlkA(  
     MaskBits|=ALTBIT; 2OVRf0.R~  
     break; waj0"u^#  
    case VK_CONTROL: _ =VqrK7T  
     MaskBits|=CTRLBIT; vkEiOFU!u  
     break; Lo N< oj5  
    case VK_SHIFT: T~##,qQ  
     MaskBits|=SHIFTBIT; DrY:9[LP  
     break; ^Dn D>h@q  
    default: //judge the key and send message  :7]Sa`  
     break; [R^i F  
   } (Fhs"  
   for(int index=0;index<MAX_KEY;index++) WGZ9B^A  
   { kr9*,E9cv  
    if(hCallWnd[index]==NULL) _8F`cuyW  
     continue; aGtf z)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oF1,QQ^dg  
    {  VoWNW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jk[1{I/  
     bProcessed=TRUE; Zy?Hi`  
    } ?En O"T.  
   } n%.7h3  
  } /YMj-S_b~  
  if(!bProcessed){ m!tbkZHQn0  
   for(int index=0;index<MAX_KEY;index++){ :2rZcoNb.  
    if(hCallWnd[index]==NULL) 8"8t-E#?  
     continue; S79;^X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eoG$.M"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I%j|D#qY:T  
   } i/`m`qdg  
  } # Oc] @  
 } j2StXq3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7` zHX&-W  
} qh|_W(`y  
c]n1':FT"  
BOOL InitHotkey() 7'W%blg!V  
{ `tA" }1;ka  
 if(hHook!=NULL){ iXVe.n  
  nHookCount++; 1AM!8VR2  
  return TRUE; U4C 9<h&  
 } SwTL|+u  
 else }J:U=HJ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :~tAUy":_*  
  if(hHook!=NULL) #FCnA  
   nHookCount++; $0>60<J  
  return (hHook!=NULL); %7IugHH9y  
} p93r'&Q  
BOOL UnInit() t\k$};qJ  
{  #~2%)  
 if(nHookCount>1){ 7byK{{/z  
  nHookCount--; Cz\e w B  
  return TRUE; t(NI-UXBp  
 } g(qJN<R C/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~=6xyc/c  
 if(unhooked==TRUE){ +eK"-u~K  
  nHookCount=0; aW)-?(6>  
  hHook=NULL; mD$A4Y-'p  
 } hIs4@0  
 return unhooked; -.u]GeMy  
} :t8b39  
8*#R]9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s%nUaWp~  
{ %et } A93  
 BOOL bAdded=FALSE; k;AD`7(=  
 for(int index=0;index<MAX_KEY;index++){ Sq/ qu-%X  
  if(hCallWnd[index]==0){ =jOv] /  
   hCallWnd[index]=hWnd; c[wla<dO*  
   HotKey[index]=cKey; a eFe!`F  
   HotKeyMask[index]=cMask; 6}[I2F_^  
   bAdded=TRUE; :cem,#(=  
   KeyCount++; la0BiLzb]  
   break; ([T>.s  
  } "d#Y}@*~o  
 } lT(WD}OS  
 return bAdded; V@e?#iz  
} LrM=*R h,O  
DCIxRPw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oTU!R ,  
{ jnKWZ/R  
 BOOL bRemoved=FALSE; y&q*maa[  
 for(int index=0;index<MAX_KEY;index++){ Fq~yL!#!  
  if(hCallWnd[index]==hWnd){ ,Ys %:>?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZRh~`yy  
    hCallWnd[index]=NULL; 5[k/s}g  
    HotKey[index]=0; Xx."$l  
    HotKeyMask[index]=0; :DrWq{4  
    bRemoved=TRUE; `w#Oih!6A|  
    KeyCount--; [R(`W#W  
    break; Y!~49<;  
   } $+8cc\fq  
  } Pk{_(ybaY  
 } =9y[1t  
 return bRemoved; ?26I,:;  
} p4.wh|n  
Se :.4<  
void VerifyWindow() 2,$8icM  
{ Cc+t}"^  
 for(int i=0;i<MAX_KEY;i++){ l2zFKCGF(  
  if(hCallWnd!=NULL){ @Owb?(6?  
   if(!IsWindow(hCallWnd)){ we~[] \  
    hCallWnd=NULL; :q$.,EZ4#n  
    HotKey=0; V)Z}En["1  
    HotKeyMask=0; >Wm `v.-  
    KeyCount--; q8X feoUV  
   } ]fx"4qKM  
  } 2iY3Lsna  
 } [YRz*5   
} #|Y5,a ,{  
][gq#Vx@  
BOOL CHookApp::InitInstance() 3GaQk-  
{ 5,3'=mA6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hm84Aq= f  
 hins=AfxGetInstanceHandle(); q+H%)kF  
 InitHotkey(); 6]V4muz#c  
 return CWinApp::InitInstance(); bU>U14ix<  
} *g:4e3Iy  
Fsmycr!R  
int CHookApp::ExitInstance() E ]A#Uy  
{ >BR(Wd.  
 VerifyWindow(); oX#Q<2z*  
 UnInit(); `slL %j^"  
 return CWinApp::ExitInstance(); Yl4^AR&  
} M>wYD\oeg  
nOt&pq7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file zvYq@Mhr  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =e/9&993  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s>B5l2Q4  
#if _MSC_VER > 1000 j`JMeCG=Ee  
#pragma once V, Z|tB^  
#endif // _MSC_VER > 1000 0IwA#[m1`  
(7mAt3n k  
class CCaptureDlg : public CDialog (|[2J3ZET  
{ @oNH@a j%  
 // Construction *?5*m+  
 public: ;X8yFq  
  BOOL bTray; EY^1Y3D w0  
  BOOL bRegistered; opY@RJ]  
  BOOL RegisterHotkey(); F|d\k Q  
  UCHAR cKey; +DW~BS3  
  UCHAR cMask; j-4VB_N@  
  void DeleteIcon(); AYt%`Y.!  
  void AddIcon(); 3C?f(J}  
  UINT nCount; xHUsFm s  
  void SaveBmp(); `n#H5Oyn  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Pj#<K%Bz  
  // Dialog Data Gy9$wH@8  
  //{{AFX_DATA(CCaptureDlg) ]mo-rhDsM  
  enum { IDD = IDD_CAPTURE_DIALOG }; eK6hS_E  
  CComboBox m_Key; |8&,b`Gfo  
  BOOL m_bControl; :Ux?,  
  BOOL m_bAlt; Qi ua  
  BOOL m_bShift; V@B__`y7  
  CString m_Path; -|J"s$yO4  
  CString m_Number; HKU~UTRnZ  
  //}}AFX_DATA nim*/LC[:  
  // ClassWizard generated virtual function overrides %z /hf  
  //{{AFX_VIRTUAL(CCaptureDlg) ~k\fhx  
 public: zjJ *n8l  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9E zj"  
 protected: 6TQoqH8@U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UR%/MV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?+_Gs;DGVE  
  //}}AFX_VIRTUAL txJr;  
  // Implementation 8e*,jH3  
 protected: @XgKYm   
  HICON m_hIcon; w zYzug  
  // Generated message map functions 7F zA*  
  //{{AFX_MSG(CCaptureDlg) Of- Rx/  
  virtual BOOL OnInitDialog(); p6 ]7&{>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); xO$lsZPG  
  afx_msg void OnPaint(); $:cE ^8K  
  afx_msg HCURSOR OnQueryDragIcon(); 9*2[B"5  
  virtual void OnCancel(); C\3y {s  
  afx_msg void OnAbout(); ~8~aJ^[  
  afx_msg void OnBrowse(); c2h{6;bfY  
  afx_msg void OnChange(); &qMPq->  
 //}}AFX_MSG M2HomO/X)  
 DECLARE_MESSAGE_MAP() iWRH{mK  
}; $h5xH9x ;  
#endif I CZ4 A{I  
VYu~26Zr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XF Patd  
#include "stdafx.h" UM!ENI|  
#include "Capture.h" VbJiZw(aR  
#include "CaptureDlg.h" ~o82uw?  
#include <windowsx.h> ~c8? >oN(  
#pragma comment(lib,"hook.lib") @E^~$-J5j  
#ifdef _DEBUG sc|_Q/`\.  
#define new DEBUG_NEW o]+z)5zC  
#undef THIS_FILE 3[\iQ*d }B  
static char THIS_FILE[] = __FILE__; J{l1nHQZSu  
#endif )hd@S9Z.Y  
#define IDM_SHELL WM_USER+1 [OjF[1I)u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @AK n@T5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `k=bL"T>\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  :l~ I  
class CAboutDlg : public CDialog {kp-h2I,  
{ RSr %n1  
 public: X'wE7=29M  
  CAboutDlg(); V_>\ 9m  
  // Dialog Data !zux z  
  //{{AFX_DATA(CAboutDlg) /d0K7F  
  enum { IDD = IDD_ABOUTBOX }; il}%7b-  
  //}}AFX_DATA A3rPt&<a  
  // ClassWizard generated virtual function overrides nnCG g+l  
  //{{AFX_VIRTUAL(CAboutDlg) ^:K3vC[h;c  
 protected: unshH<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m*ISa(#(,  
  //}}AFX_VIRTUAL Yb:\a/ y  
  // Implementation P#pn*L*"T  
 protected: E>&n.%  
  //{{AFX_MSG(CAboutDlg) %dJX-sm@  
  //}}AFX_MSG 7x#Ckep:I  
  DECLARE_MESSAGE_MAP() bIGHGd  
}; 4Yxo~ m(  
ML:Q5 ^`  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^=C{.{n  
{ ?bPRxR  
 //{{AFX_DATA_INIT(CAboutDlg) "XB[|#&  
 //}}AFX_DATA_INIT 0rh]]kj  
} O>SLOWgha  
x6(~;J  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t]>Lh>G  
{ &Q+Ln,(&L  
 CDialog::DoDataExchange(pDX); z|=}1; (.  
 //{{AFX_DATA_MAP(CAboutDlg) kV?y0J.  
 //}}AFX_DATA_MAP 9w"h  
} M>DaQ`b  
kz{/(t  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "Weg7mc#  
 //{{AFX_MSG_MAP(CAboutDlg) +hvO^?4j  
 // No message handlers `1'6bp`Z  
 //}}AFX_MSG_MAP &@%W29:  
END_MESSAGE_MAP() UH]l9Aq$P  
TS/.`.gT  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P6!jRC"52'  
: CDialog(CCaptureDlg::IDD, pParent) X'%E\/~u  
{ M9EfU  
 //{{AFX_DATA_INIT(CCaptureDlg) .zS?9MP  
  m_bControl = FALSE; 8*8Zc/{  
  m_bAlt = FALSE; pF&(7u  
  m_bShift = FALSE; pcau}5 .  
  m_Path = _T("c:\\"); !g Z67  
  m_Number = _T("0 picture captured."); thV>j9'  
  nCount=0; RMX:9aQ3F  
  bRegistered=FALSE; 6;C3RU]  
  bTray=FALSE; :q=%1~Idla  
 //}}AFX_DATA_INIT #~SP)Ukp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1=#q5dZ]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /3;4#:Kkw  
} 7.C;NT  
*4_jA](  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !xP8# |1  
{ ^ s1Q*He  
 CDialog::DoDataExchange(pDX); a-l; vDs  
 //{{AFX_DATA_MAP(CCaptureDlg) $"0MU  
  DDX_Control(pDX, IDC_KEY, m_Key); HOw -]JSP2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m0LTx\w!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Nndddk`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j*F`"df  
  DDX_Text(pDX, IDC_PATH, m_Path); @.G[s)x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~7Ts_:E-  
 //}}AFX_DATA_MAP f>aEkh6u9  
} jZh';M8"  
;FBUwR}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R16'?,  
//{{AFX_MSG_MAP(CCaptureDlg) XpmS{nb  
 ON_WM_SYSCOMMAND() bA= |_Wt  
 ON_WM_PAINT() (:._"jp]  
 ON_WM_QUERYDRAGICON() 0dhF&*h|L  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ktj]:rCkF  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) C K:y?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Yiry["[]Q  
//}}AFX_MSG_MAP Q@ 2i~Qo[  
END_MESSAGE_MAP() 8#(Q_  
V+Cwzc^j  
BOOL CCaptureDlg::OnInitDialog() /DQc&.jK  
{ M%1}/!J3  
 CDialog::OnInitDialog(); _7IKzUn9g[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )N=NR2xBZ  
 ASSERT(IDM_ABOUTBOX < 0xF000); RQ'exc2x0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V6t,BJjS  
 if (pSysMenu != NULL) Xv< B1  
 { uwa~-xX6  
  CString strAboutMenu; vJ\pR~?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N` aF{3[  
  if (!strAboutMenu.IsEmpty()) b7!Qn}  
  { r`AuvwHPs[  
   pSysMenu->AppendMenu(MF_SEPARATOR); RE =`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2kdC]|H2?  
  } RY c!~Wh~Y  
 } t]$P1*I  
 SetIcon(m_hIcon, TRUE); // Set big icon Eq$&qV-?(  
 SetIcon(m_hIcon, FALSE); // Set small icon w4W_iaU  
 m_Key.SetCurSel(0); A3B56K  
 RegisterHotkey(); vk*=4}:  
 CMenu* pMenu=GetSystemMenu(FALSE); !PrwH;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _@ *+~9%8p  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wNQ*t-K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p3]_}Y D[#  
 return TRUE; // return TRUE unless you set the focus to a control X>NhZ5\  
}  1WY/6[  
Zm=(+ f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?CC"Yij  
{ )Psb>'X  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %^I88,$&L  
 { U+)xu>I  
  CAboutDlg dlgAbout; w" SoeU  
  dlgAbout.DoModal(); ogL EtqT  
 } cU{e`<xjA  
 else *Ho/ZYj3  
 { (T!9SU  
  CDialog::OnSysCommand(nID, lParam); BNd^qB ?  
 } \e!vj.PU  
} fO0(Z  
F1jglH/MF)  
void CCaptureDlg::OnPaint() +n<k)E@>J  
{ w3=%*<  
 if (IsIconic()) AtF3%Z v2  
 { pGf@z:^{*-  
  CPaintDC dc(this); // device context for painting $aN-Y?U%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N@Y ljz|  
  // Center icon in client rectangle )RO<o O  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^ <Pq,u%k  
  int cyIcon = GetSystemMetrics(SM_CYICON); YnxRg  
  CRect rect; n| b5? 3  
  GetClientRect(&rect); ,y+$cM(  
  int x = (rect.Width() - cxIcon + 1) / 2; GN!qyT  
  int y = (rect.Height() - cyIcon + 1) / 2; F)+{AQL  
  // Draw the icon d}JP!xf%  
  dc.DrawIcon(x, y, m_hIcon); %]I ZLJ  
 } &^}6 9  
 else |1ST=O7.LH  
 { +)j1.X  
  CDialog::OnPaint(); wjh=Q  
 } _)]+hUw Y  
} N\HQN0d9  
tID%}Zv  
HCURSOR CCaptureDlg::OnQueryDragIcon() &}?$i7x5  
{ ;5tazBy&:C  
 return (HCURSOR) m_hIcon; zo[[>MA  
} ~mO62(8m  
ep=qf/vd<  
void CCaptureDlg::OnCancel() ~=KJzOS,S  
{ 0pJ ":Q/2)  
 if(bTray) ZTU&, 1Y;  
  DeleteIcon(); rAs,X  
  CDialog::OnCancel(); QHWBAGA  
} Pb8^ b  
$<^u^q37u  
void CCaptureDlg::OnAbout() "Kc>dJ@W  
{ ]S(%[|  
 CAboutDlg dlg; /[6j)HIS  
 dlg.DoModal(); ^bc;[x&N  
} em\ 9'L^  
KN?6;G{  
void CCaptureDlg::OnBrowse()  ;zYqsS  
{ a)S+8uU  
 CString str; ]~6_WE8L  
 BROWSEINFO bi; .\8X[%K9nc  
 char name[MAX_PATH]; &Ch#-CUE/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); FL8g5I  
 bi.hwndOwner=GetSafeHwnd(); m}8[#:  
 bi.pszDisplayName=name; >~`r:0',  
 bi.lpszTitle="Select folder"; I j$lDJS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,_X /Gb6)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 59zENUYl  
 if(idl==NULL) zH>hx5,k'X  
  return; @#P,d5^G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +J{0 E  
 str.ReleaseBuffer(); <c%W")0  
 m_Path=str; fx@j?*Qb  
 if(str.GetAt(str.GetLength()-1)!='\\') "H&"(=  
  m_Path+="\\"; j:}DBk  
 UpdateData(FALSE); H-3Eo#b#  
} B%KG3]  
6<N5_1  
void CCaptureDlg::SaveBmp() ?W( 6  
{ K]U;?h&CZc  
 CDC dc; M.nvB)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RGn!{=  
 CBitmap bm; Z0`T\ay  
 int Width=GetSystemMetrics(SM_CXSCREEN); eL4NB$Fb  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2_ :n  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  P\]B<  
 CDC tdc; 70lfb`  
 tdc.CreateCompatibleDC(&dc); n.sbr  
 CBitmap*pOld=tdc.SelectObject(&bm); fM #7y [  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); UG'bOF4  
 tdc.SelectObject(pOld); Wm H~m k"  
 BITMAP btm; F  q!fWl  
 bm.GetBitmap(&btm); y!5$/`AF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?6nF~9Z'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); y$3;$ R^  
 BITMAPINFOHEADER bih; $5v0m#[^  
 bih.biBitCount=btm.bmBitsPixel; dJv!Dts')C  
 bih.biClrImportant=0; 'S2bp4G  
 bih.biClrUsed=0; ,ZQZ}`x(  
 bih.biCompression=0; <BO)E(  
 bih.biHeight=btm.bmHeight; <BSc* 9Q  
 bih.biPlanes=1; P_c,BlfGMH  
 bih.biSize=sizeof(BITMAPINFOHEADER); oW^*l#v  
 bih.biSizeImage=size; gORJWQv  
 bih.biWidth=btm.bmWidth; VR  
 bih.biXPelsPerMeter=0; ltkI}h,e  
 bih.biYPelsPerMeter=0; RZe'Kw -  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); V97,1`  
 static int filecount=0; [w\9as/ E  
 CString name; mKT>,M  
 name.Format("pict%04d.bmp",filecount++); p-%|P ]&  
 name=m_Path+name; 2kv7UU#q2  
 BITMAPFILEHEADER bfh; `)qVF,Z}  
 bfh.bfReserved1=bfh.bfReserved2=0;  PlYm&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L{E^?iX  
 bfh.bfSize=54+size; %L [&,a  
 bfh.bfOffBits=54; pA;-v MpMj  
 CFile bf;  e(NLX`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /t6X(*xoy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /XudV2P-CA  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y7S4d~&  
  bf.WriteHuge(lpData,size); /m( =`aRt  
  bf.Close(); rCS#{x  
  nCount++; ^m/14MN|  
 } NxVw!TsR  
 GlobalFreePtr(lpData); a=XW[TY1  
 if(nCount==1) hk/! 'd  
  m_Number.Format("%d picture captured.",nCount); 1xU3#b&2tC  
 else GabYfUkO  
  m_Number.Format("%d pictures captured.",nCount); }<PxWZ`,\  
  UpdateData(FALSE); ?:|-Dq,  
} |v[Rp=?]  
Qu< Bu)`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T6pLoaKu  
{ *jMk/9oa<N  
 if(pMsg -> message == WM_KEYDOWN) D0mI09=GtQ  
 { v`V7OD#:j]  
  if(pMsg -> wParam == VK_ESCAPE) M7>(hVEAW'  
   return TRUE; P]i =r] i  
  if(pMsg -> wParam == VK_RETURN) V:/7f*n7  
   return TRUE; _SACqamo5s  
 } JlKM+UE :  
 return CDialog::PreTranslateMessage(pMsg); +,v-=~5  
} <!pQ  
mR8W]'gl.L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;pD)m/$h`  
{ q!f1~aG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ s4%(>Q  
  SaveBmp(); rdnRBFt   
  return FALSE; CSV;+,Vv  
} /U6% %%-D`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mp~{W  
 CMenu pop; `.#@@5e  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Qp2I[Ioz3  
 CMenu*pMenu=pop.GetSubMenu(0); 9_fePS|Z4  
 pMenu->SetDefaultItem(ID_EXITICON); wh:1PP  
 CPoint pt; aS|wpm)K>8  
 GetCursorPos(&pt); * MM[u75  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }X;U|]d  
 if(id==ID_EXITICON) qn"D#K'&(  
  DeleteIcon(); Dml*T(WM>  
 else if(id==ID_EXIT) XJ!(F#zc  
  OnCancel(); o{*ay$vA]  
 return FALSE; 0)9"M.AIvo  
} CK_(b"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); * n(> ^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u@p?  
 AddIcon(); VGw(6`|!  
 return res; :)jJge&^p  
} @c'|Iqy`  
.bf<<+'o  
void CCaptureDlg::AddIcon() 9kKnAf4Z  
{ D\^WXY5e%y  
 NOTIFYICONDATA data; xjdw'v+qZo  
 data.cbSize=sizeof(NOTIFYICONDATA); G6K  <  
 CString tip; [oc~iDx%W  
 tip.LoadString(IDS_ICONTIP); K?#]("De6  
 data.hIcon=GetIcon(0); ,pK| SL  
 data.hWnd=GetSafeHwnd(); NHw x:-RH  
 strcpy(data.szTip,tip); gM>=%/.  
 data.uCallbackMessage=IDM_SHELL; kW6%32  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +*&cz  
 data.uID=98; E)ugLluL  
 Shell_NotifyIcon(NIM_ADD,&data); Io2mWvu?5  
 ShowWindow(SW_HIDE); E?PGu!&u  
 bTray=TRUE;  .Qt4&B  
} )[&_scSa  
@\(vX]  
void CCaptureDlg::DeleteIcon() ?IX!+>.H  
{ OlxX.wP  
 NOTIFYICONDATA data; lEPAP|~uw  
 data.cbSize=sizeof(NOTIFYICONDATA); {OT:3SS7  
 data.hWnd=GetSafeHwnd(); j1Yq5`ia  
 data.uID=98; 7.<^j[?  
 Shell_NotifyIcon(NIM_DELETE,&data); ;]CVb`d  
 ShowWindow(SW_SHOW); 4ZT A>   
 SetForegroundWindow(); y?30_#[dN  
 ShowWindow(SW_SHOWNORMAL); L6 6-LMkH  
 bTray=FALSE; +TN9ujL6@  
} SQE[m9v  
,6<"  
void CCaptureDlg::OnChange() (}!C4S3#  
{ (#(O r  
 RegisterHotkey(); %-;b u|  
} yy2Ie  
# Oup^ o@  
BOOL CCaptureDlg::RegisterHotkey() ,D80/2U^  
{ `PI(%N  
 UpdateData(); XeUC0K[D  
 UCHAR mask=0; TUp%FJXA|  
 UCHAR key=0; 3Rl,GWK  
 if(m_bControl) ned2lC&'d>  
  mask|=4; t~K%.|'0  
 if(m_bAlt) #~?kYCtC)  
  mask|=2;  eIPG#A  
 if(m_bShift) ~@I@}n  
  mask|=1; m4ApHM2  
  key=Key_Table[m_Key.GetCurSel()]; NB8&   
 if(bRegistered){ 1M%S gV-#  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !)NidG  
  bRegistered=FALSE; ]Ql 0v"` F  
 } OCyG_DLT$5  
 cMask=mask; Lx|',6S  
 cKey=key; n l/UdgI  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I#A2)V0P)  
 return bRegistered; NVIWWX9?  
} c^I0y!  
#] KgUc5B  
  四、小结 8IY19>4'5J  
,8K'F  
  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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