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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: d*d:-f~q  
  $UH:r  
  一、实现方法 DH?n~qKpC  
P! +Gwm{  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: (2# Xa,pb  
0 MK}  
#pragma data_seg("shareddata") Q0R05*  
HHOOK hHook =NULL; //钩子句柄 %jjPs .  
UINT nHookCount =0; //挂接的程序数目 9-T<gYl  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 2]mV9B   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 BwWSztJ+B  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey uM`i!7}  
static int KeyCount =0; P_A@`eU0  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 N4+Cg t(  
#pragma data_seg() ]oV{JR]  
Nf )YG!  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 vd lss|  
%cSx`^`6j  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: fG'~@'P~  
k 3m_L-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR IADHe\.  
cKey,UCHAR cMask) S3Y.+. 0U  
{ {nwoJ'-V  
 BOOL bAdded=FALSE; @G2# Z  
 for(int index=0;index<MAX_KEY;index++){ 0beP7}$  
  if(hCallWnd[index]==0){ j $q5m 24L  
   hCallWnd[index]=hWnd; > mO*.'Gm  
   HotKey[index]=cKey; cZBXH*-M!  
   HotKeyMask[index]=cMask;  !vf:mMo  
   bAdded=TRUE; OlCqv-B2&  
   KeyCount++; @KL&vm(F$  
   break; MG vz-E1e  
  } I/njyV)H  
 } ~".@mubt1$  
 return bAdded; :u,.(INB  
} 7zH2dqrj  
//删除热键 F~6]II  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U&#` <R_0  
{ =T9h7c R  
 BOOL bRemoved=FALSE; ?\8aT"o  
 for(int index=0;index<MAX_KEY;index++){ 62HA[cr&)  
  if(hCallWnd[index]==hWnd){ YAc:QVT87  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X\Bl? F   
    hCallWnd[index]=NULL; HMF2sc$N  
    HotKey[index]=0; fc3nQp7  
    HotKeyMask[index]=0; 3l?|+sU >O  
    bRemoved=TRUE; ;"nO'wN:h  
    KeyCount--;  ,RR{Y-  
    break; ;F258/J  
   } 7=Muq]j2  
  } `6VnL)  
 } A:(|"<lA  
 return bRemoved; k3$'K}=d  
} i6V$mhL  
vSnVq>-q&  
,CyX*k8o  
  DLL中的钩子函数如下:  )58O9b  
?IAu,s*u  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /=;,lC  
{ qkhre3  
 BOOL bProcessed=FALSE; c]E pg)E  
 if(HC_ACTION==nCode) AF#: *<Ev  
 { nCi ]6;Y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vE )N6Ss  
   switch(wParam) GPHb-  
   {  +1T>Ob;hk  
    case VK_MENU: t}R!i-D|HB  
     MaskBits&=~ALTBIT; _\d|`3RM  
     break; ^)9/Wz _x  
    case VK_CONTROL: tM"vIz 05  
     MaskBits&=~CTRLBIT; B7uK:J:c*H  
     break; >;Hx<FKxP  
    case VK_SHIFT: ?-c|c_|$  
     MaskBits&=~SHIFTBIT; :(XyiF<Ud  
     break; YWn""8p;P  
    default: //judge the key and send message f0 g/`j@Up  
     break; (m2%7f.I  
   } bji#ID2]%  
   for(int index=0;index<MAX_KEY;index++){ <2]h$53y!  
    if(hCallWnd[index]==NULL) g sm%4>sc  
     continue; 0\!Bh^++1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tkV[^OeU>  
    { }'Ap@4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A~Sc ] M  
     bProcessed=TRUE; d"n>Q Tn\  
    } h i!K-_Uy  
   } sBZn0h@  
  } =* 'yGB[x)  
  else if((lParam&0xc000ffff)==1){ //有键按下 eWqS]cM#  
   switch(wParam) g"n>v c7  
   { #tZ!D^GQHq  
    case VK_MENU: {Yxvb**  
     MaskBits|=ALTBIT; (QIU3EN  
     break; >A D!)&c  
    case VK_CONTROL: huv|l6   
     MaskBits|=CTRLBIT; 9K}DmS  
     break; Po=:-Of:  
    case VK_SHIFT: s@~3L  
     MaskBits|=SHIFTBIT; MX~h>v3_R4  
     break; c),UO^EqV  
    default: //judge the key and send message !jl^__ .DR  
     break; x=>dmi3  
   } l1zPL3"u_^  
   for(int index=0;index<MAX_KEY;index++){ S".|j$  
    if(hCallWnd[index]==NULL) 4;~xRg;u&*  
     continue; @;9KP6d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4?@5JpC9VA  
    { )Mq4p'*A[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )xc1Lsrr9  
     bProcessed=TRUE; '2l[~T$*  
    } hFoeVM[h  
   } t@lTA>;U@  
  } #pRbRT9  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |7|'J Ty  
   for(int index=0;index<MAX_KEY;index++){ M GC=L .  
    if(hCallWnd[index]==NULL) b/.EA' /  
     continue; 9ox5,7ZQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M"c=_5P  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |C./gdq  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 U{EcV%C2  
   } Dp*:oMATx0  
  } uUaDesz~=  
 } pPsTgGai  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W"/,<xHuh  
} FFwu$S6e  
%QDAog  
  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: Yc[vH=gV}  
A5fzyG   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?aaYka]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,|+{C~Ojx  
'U@Ep  
  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: IwXQbJ3v_  
SPT x-b[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1N]-WCxQ  
{ Ktuv a3=>N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Xhyc2DKa_  
 { V+' zuX  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 29@m:=-}7  
  SaveBmp(); ?)qm=mebY  
  return FALSE; qi_uob  
 } z5^Se!`5  
 …… //其它处理及默认处理 sN[<{;K4  
} k fOd|-  
OlW5k`B  
Ov:U3P?%  
  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。 q|B.@Ng.  
4GJx1O0Ol  
  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。 1- GtZ2  
`+(JwQC4  
  二、编程步骤 /ubGa6N  
O[}2  
  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"; cpq0' x\  
>tkU+$;-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Qmv8T ^+  
Ip,0C8T`Q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; yrMakT=  
L~M6 ca"  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +P*,i$MV  
a^L'-(  
  5、 添加代码,编译运行程序。 t2-bw6U  
M)nf(jw#G  
三、程序代码 SP|Dz,o  
F>q%~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &2Cu"O'.i  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @ao Hz8K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ nR?m,J  
#if _MSC_VER > 1000 y-7$HWn  
#pragma once >\ym{@+*  
#endif // _MSC_VER > 1000 u $T'#p1  
#ifndef __AFXWIN_H__ JA?P jo  
#error include 'stdafx.h' before including this file for PCH Dmk~t="Y  
#endif 0V#eC  
#include "resource.h" // main symbols wW;!L =j  
class CHookApp : public CWinApp dLu3C-.(  
{ 6n.C!,Zmn  
 public: JMYM}G  
  CHookApp(); D)LqkfJ}z^  
  // Overrides F;dUqXUu  
  // ClassWizard generated virtual function overrides x42m+5/  
  //{{AFX_VIRTUAL(CHookApp) H!{Cr#=  
 public: %xI,A'#  
  virtual BOOL InitInstance(); v.I>B3bEg  
  virtual int ExitInstance(); (%EhkTb  
  //}}AFX_VIRTUAL > jvi7  
  //{{AFX_MSG(CHookApp) du4Q^-repC  
  // NOTE - the ClassWizard will add and remove member functions here. wp8ocZ-Gj  
  // DO NOT EDIT what you see in these blocks of generated code ! cw{[% 7  
  //}}AFX_MSG as6YjE.Yy  
  DECLARE_MESSAGE_MAP() Z:}d\~`x$%  
}; Rm!Iv&{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ZMXIKN9BF#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g"sW_y_O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +V6N/{^ 5  
BOOL InitHotkey(); QR($KW(  
BOOL UnInit(); GoNX\^A  
#endif q\g|K3V)  
&iDX+*(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. cvvba 60  
#include "stdafx.h" \{[Gdj`  
#include "hook.h" Y_49UtJIg  
#include <windowsx.h> mmG+"g$|  
#ifdef _DEBUG %g4G&My@J  
#define new DEBUG_NEW jn9KQe\3  
#undef THIS_FILE e" f/  
static char THIS_FILE[] = __FILE__; r4h4A w{  
#endif v(/T<^{cuk  
#define MAX_KEY 100 g2v 0!  
#define CTRLBIT 0x04 wh@;$s"B  
#define ALTBIT 0x02 @m[r0i0J"  
#define SHIFTBIT 0x01 A~6:eappH  
#pragma data_seg("shareddata") 2\M^ _x$N  
HHOOK hHook =NULL; ("k.5$  
UINT nHookCount =0; lXS.,#lp  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E1'HdOh&z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "$*&bC#dE  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #,1Kum bG3  
static int KeyCount =0; _Jc[`2Uv_c  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Oozt&* F  
#pragma data_seg() 9""e*-;Mi  
HINSTANCE hins; ?[}r& f  
void VerifyWindow(); f\}fUg 2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) P"LbWZ6Nj  
//{{AFX_MSG_MAP(CHookApp) a'zf8id  
// NOTE - the ClassWizard will add and remove mapping macros here. Fcc\hV;  
// DO NOT EDIT what you see in these blocks of generated code! ruG5~dm>  
//}}AFX_MSG_MAP =G%k|  
END_MESSAGE_MAP() ua%$r[  
0Z{f!MOh  
CHookApp::CHookApp() ]kQ*t{\  
{ I dsPB)k_  
 // TODO: add construction code here, O9#8%p% )  
 // Place all significant initialization in InitInstance )A}u)PH4O  
} |UN0jR  
KErQCBeJ  
CHookApp theApp; IvFxI#.ju  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :nZVP_d+  
{ uz6S7I  
 BOOL bProcessed=FALSE; E)l0`83~^  
 if(HC_ACTION==nCode) |kPjjVGF{  
 { AM4lAq_  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,Q8[Ur? G  
   switch(wParam) 1PD{m{  
   { @kCFc}  
    case VK_MENU: a\60QlAk~  
     MaskBits&=~ALTBIT; fk5xIW  
     break; ^Oy97Y  
    case VK_CONTROL: \':'8:E  
     MaskBits&=~CTRLBIT; >?/Pl"{b  
     break; 1 !N+hf  
    case VK_SHIFT: I d6H~;  
     MaskBits&=~SHIFTBIT; I8R#EM%C#  
     break; &\8qN_`  
    default: //judge the key and send message J?]wA1  
     break; Wt|IKCx   
   } M3m!u[6|  
   for(int index=0;index<MAX_KEY;index++){ 5L6_W -n{  
    if(hCallWnd[index]==NULL) )k)HQcfjD  
     continue; w$Zi'+&*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (_h=|VjK(I  
    { h$p]M^Z7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a8D7n Ea  
     bProcessed=TRUE; (}Q(Ux@X  
    } -|0nZ  
   } US5 ]@!  
  } K/xn4N_UX  
  else if((lParam&0xc000ffff)==1){ //Key down S T#9auw  
   switch(wParam) nHAET  
   { hkS0ae  
    case VK_MENU: ~ _ ogeD  
     MaskBits|=ALTBIT; >6Y @8 )  
     break; kYbqb?  
    case VK_CONTROL: Qt-7jmZw1  
     MaskBits|=CTRLBIT; \9 ,a"g  
     break; 3jSt&+  
    case VK_SHIFT: kq| r6uE  
     MaskBits|=SHIFTBIT; Q]/ZVcoqo  
     break; p.wed% O.  
    default: //judge the key and send message {KQ-QKxxS  
     break; !wbO:py[8>  
   } v2w|?26Lf  
   for(int index=0;index<MAX_KEY;index++) olm0O  (9  
   { #VM+.75o1  
    if(hCallWnd[index]==NULL) &`@S_YLr  
     continue; d- X6yRjnj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o,r72>|  
    { %C[#:>'+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -!@]z2uU  
     bProcessed=TRUE; ke2zxX2 f  
    } .1{:Q1"S  
   } 6Qc *:(GE  
  } \wjT|z1+Y  
  if(!bProcessed){ PJfADB7Y  
   for(int index=0;index<MAX_KEY;index++){ ^X]rFY1  
    if(hCallWnd[index]==NULL) As{Q9o5j/  
     continue; $?Km3N\?v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i'cGB5-j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h5)4Z^n  
   } $)YalZ  
  } C.|.0^5  
 } O*SJx.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X-4(oE  
} @vc9L  
c9ye[81  
BOOL InitHotkey() u Vth&4dh9  
{ `w8Ejm?n  
 if(hHook!=NULL){ d[F3"b%  
  nHookCount++; ~XeWN^l(Ov  
  return TRUE; Kj7 ?_o{  
 } 9]L4`.HM  
 else : uxJGx  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <B Vx%  
  if(hHook!=NULL) :Z[|B(U  
   nHookCount++; j'uzjs[  
  return (hHook!=NULL); NwcRH9};i  
} H2S/!Q;K  
BOOL UnInit() Z!+n/ D-1  
{ %jo,Gv  
 if(nHookCount>1){ 6fm oI K{  
  nHookCount--; :u,Ji9 u  
  return TRUE; yHo#v:>?p  
 } no$X0ia  
 BOOL unhooked = UnhookWindowsHookEx(hHook); J[{ R:l\  
 if(unhooked==TRUE){ 03n+kh  
  nHookCount=0; /[qLf:rGI  
  hHook=NULL; W5uC5C*,l  
 } -]Ny-[P  
 return unhooked; e +Ikw1y"f  
} Z5V_?bm$  
kr\#CW0?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V 7oE\cxr  
{ Z817f]l  
 BOOL bAdded=FALSE; |fB/hs \  
 for(int index=0;index<MAX_KEY;index++){ nGM;|6x"8|  
  if(hCallWnd[index]==0){ )b~+\xL5J  
   hCallWnd[index]=hWnd; ?BX}0RWMh7  
   HotKey[index]=cKey; 7*kTu0m  
   HotKeyMask[index]=cMask; uO((Mg  
   bAdded=TRUE; A6 I^`0/  
   KeyCount++; !S'!oinV  
   break; kp Rk.Q*  
  } ]*X z~Ox2  
 } *^iSP(dg  
 return bAdded; "H9q%S,FH  
} K}DrJ/s  
IC6'>2'=T  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q26 qY5D  
{ uvRX{q 4  
 BOOL bRemoved=FALSE; F;MACu;x  
 for(int index=0;index<MAX_KEY;index++){ Ml,in49  
  if(hCallWnd[index]==hWnd){ YB_fy8Tfx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ri3*au/Q  
    hCallWnd[index]=NULL; Q yhu=_&  
    HotKey[index]=0; `Bb32L   
    HotKeyMask[index]=0; ~wu\j][2  
    bRemoved=TRUE; g77:92  
    KeyCount--; PB)vE  
    break; gX`C76P!  
   } }((P)\s  
  } Q$5%9  
 } E;YD5^B  
 return bRemoved; sT,*<^  
} ^[6#Kw&E  
./<giTR:p  
void VerifyWindow() Of-8n-  
{ :|-^et]a8  
 for(int i=0;i<MAX_KEY;i++){ i&-g  
  if(hCallWnd!=NULL){ 9fYof  
   if(!IsWindow(hCallWnd)){ +.v+Opp,  
    hCallWnd=NULL; 59(kk;  
    HotKey=0; YXg^t$  
    HotKeyMask=0; Xif>ZL?aXb  
    KeyCount--; Z ?ATWCa  
   } @vO~'Xxq!  
  } id)J;!^;J  
 } aNgJm~K0P  
} 'X~CrgQl  
k;<F33v;Mh  
BOOL CHookApp::InitInstance() Gb.}af#v  
{ L> rW S-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); F<O<=Ww  
 hins=AfxGetInstanceHandle(); a fB?js6  
 InitHotkey(); 1]aya(  
 return CWinApp::InitInstance(); n>YgL}YZ?  
} U8eU[|-8O/  
%1M!4**W  
int CHookApp::ExitInstance() ~Q)Dcit-  
{ ,UfB{BW  
 VerifyWindow(); .VkLF6  
 UnInit(); ):V)Hrq?x  
 return CWinApp::ExitInstance(); 0Hr)h{!F"  
} ;nb>IL  
Mvk#$:8e  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nz`"f,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }S9uh-j6l  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;_1 >nXh  
#if _MSC_VER > 1000 Jh%k:TrBm  
#pragma once ^ |>)H  
#endif // _MSC_VER > 1000 aT=V/Xh}d  
X6oY-4O  
class CCaptureDlg : public CDialog NmV][0(BS  
{ S4%MnT6Uy  
 // Construction m A|"  
 public: mh~n#bah  
  BOOL bTray; @"`{Sh`Y$  
  BOOL bRegistered; (d-j/v*4  
  BOOL RegisterHotkey(); jqy?Od )  
  UCHAR cKey; Xqas[:)7+  
  UCHAR cMask; Q$2^m(?;  
  void DeleteIcon(); }u~r.=  
  void AddIcon(); XXZ$^W&  
  UINT nCount; :6frx=<  
  void SaveBmp(); !_[^%7"S1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor D\V (r\i  
  // Dialog Data lb`2a3W/  
  //{{AFX_DATA(CCaptureDlg) x20sB  
  enum { IDD = IDD_CAPTURE_DIALOG }; s)|l-I  
  CComboBox m_Key; :#p!&Fi  
  BOOL m_bControl; ]6EXaf#  
  BOOL m_bAlt; ppM^&6x^  
  BOOL m_bShift; ?HaUT(\j  
  CString m_Path; !P b39[f  
  CString m_Number; [+v}V ,jb  
  //}}AFX_DATA @y`7csb p  
  // ClassWizard generated virtual function overrides <ba+7CK] w  
  //{{AFX_VIRTUAL(CCaptureDlg) '|N9xL m  
 public: 79Vp^GG7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qbe9 CF'@_  
 protected: jP|(y]!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H"> }y D  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ceqYyVy  
  //}}AFX_VIRTUAL T5di#%: s  
  // Implementation u.sn"G-c  
 protected: 1(z+*`"WB&  
  HICON m_hIcon; g:nU&-x#R  
  // Generated message map functions o\YF_235  
  //{{AFX_MSG(CCaptureDlg) D2}nJFR ]  
  virtual BOOL OnInitDialog(); oXkxd3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); A">A@`}  
  afx_msg void OnPaint();  ,M&[c|  
  afx_msg HCURSOR OnQueryDragIcon(); i bwnK?ZA  
  virtual void OnCancel(); u)fmXoQ  
  afx_msg void OnAbout(); <C_FI` wk  
  afx_msg void OnBrowse(); H A(e  
  afx_msg void OnChange(); YEx7 6  
 //}}AFX_MSG yegTKoY  
 DECLARE_MESSAGE_MAP() -*EK-j  
}; glppb$oB\  
#endif nP>*0Fq  
Y@Kp'+t(!  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N5=; PZub  
#include "stdafx.h" lS(?x|dO  
#include "Capture.h" x1kb]0s<-  
#include "CaptureDlg.h" X|7Y|0o  
#include <windowsx.h> }GCt)i_  
#pragma comment(lib,"hook.lib") Whq@>pX8  
#ifdef _DEBUG r='"X#CmV/  
#define new DEBUG_NEW A8R}W=  
#undef THIS_FILE ZAPT5  
static char THIS_FILE[] = __FILE__; Xo*=iD$Jys  
#endif )vK %LmP  
#define IDM_SHELL WM_USER+1 DT@6Q.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '%`W y@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?*z#G'3z1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  (Ia}]q  
class CAboutDlg : public CDialog E VBB:*q6  
{ HhaUC?JtSK  
 public: J..>ApX  
  CAboutDlg(); ']+-u{+#  
  // Dialog Data 2hRaYX,g  
  //{{AFX_DATA(CAboutDlg) ]iuM2]  
  enum { IDD = IDD_ABOUTBOX }; 3I?? K)Yl  
  //}}AFX_DATA D!~-53f@  
  // ClassWizard generated virtual function overrides "| <\\HR  
  //{{AFX_VIRTUAL(CAboutDlg) '@u/] ra:  
 protected: Ak$gh b  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b$nXljV4?  
  //}}AFX_VIRTUAL 9LGJ-gL  
  // Implementation o)7gKWjujP  
 protected: PqIGc  
  //{{AFX_MSG(CAboutDlg) s,Cm}4L6  
  //}}AFX_MSG 4?X#d)L(  
  DECLARE_MESSAGE_MAP() J56+eC(  
}; Z xLjh  
dx@#6Fhy  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5DfAL;o!  
{ :QsGwhB  
 //{{AFX_DATA_INIT(CAboutDlg) |8h<Ls_  
 //}}AFX_DATA_INIT  c/I.`@  
} hNXPm~OK\  
?^us(o7-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r:y *l4  
{ SHPaSq'&N  
 CDialog::DoDataExchange(pDX); ]YZ+/:#U7  
 //{{AFX_DATA_MAP(CAboutDlg) abUn{X+f~  
 //}}AFX_DATA_MAP "TKf" zc  
} *~fZ9EkD  
3Qe:d_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) O: sjf?z  
 //{{AFX_MSG_MAP(CAboutDlg) MwL' H<  
 // No message handlers m~#S76!w  
 //}}AFX_MSG_MAP cn=~}T@~Z  
END_MESSAGE_MAP() `|i #)  
%WCA?W0:4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) yyrCO"eh  
: CDialog(CCaptureDlg::IDD, pParent) q~r )B}  
{ 7(eWBJfTo  
 //{{AFX_DATA_INIT(CCaptureDlg) 6!/e_a  
  m_bControl = FALSE; $ # @G!  
  m_bAlt = FALSE; /Yc!m$uCW  
  m_bShift = FALSE; hyL3fkMJ,  
  m_Path = _T("c:\\"); t qbS!r  
  m_Number = _T("0 picture captured."); ,m!j2H}8  
  nCount=0; m1VyYG  
  bRegistered=FALSE; ._=Pa)T  
  bTray=FALSE; `Qv7aY  
 //}}AFX_DATA_INIT zrE ~%YR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oGly|L>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d37l/I  
} WO)rJr!C  
ME1lQ7E4B  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KB7CO:  
{ \S}&QV  
 CDialog::DoDataExchange(pDX); Dz]&|5'N  
 //{{AFX_DATA_MAP(CCaptureDlg) Gk8"fs  
  DDX_Control(pDX, IDC_KEY, m_Key); > z h  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); IQoz8!guh:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 7h<Q{X<A  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 23qTmh  
  DDX_Text(pDX, IDC_PATH, m_Path); i15uHl  
  DDX_Text(pDX, IDC_NUMBER, m_Number); NUEy0pLw  
 //}}AFX_DATA_MAP kG &.|  
} -$?xR](f  
WHqp7NPl  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G7pj.rQ  
//{{AFX_MSG_MAP(CCaptureDlg) wZh&w<l'  
 ON_WM_SYSCOMMAND() r{$ip"f  
 ON_WM_PAINT() m-dne/%_  
 ON_WM_QUERYDRAGICON() R?(0:f  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i RS )Z )  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _,=A\C_b@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) KFdV_e5lU  
//}}AFX_MSG_MAP 9loWh5_1Z  
END_MESSAGE_MAP() dfiA- h  
\kvd;T#t6  
BOOL CCaptureDlg::OnInitDialog() he wX)  
{ ^L+*}4Dr  
 CDialog::OnInitDialog(); y!6B Gz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \s<{V7tq  
 ASSERT(IDM_ABOUTBOX < 0xF000); d `>M-:dF  
 CMenu* pSysMenu = GetSystemMenu(FALSE); wP/&k`HQ#i  
 if (pSysMenu != NULL) LpGplD lB  
 { KF|+# qCN  
  CString strAboutMenu; 1LZ?!Lw  
  strAboutMenu.LoadString(IDS_ABOUTBOX); YxlV2hcX;  
  if (!strAboutMenu.IsEmpty()) ,u#uk7V  
  { u&/q7EBfP  
   pSysMenu->AppendMenu(MF_SEPARATOR); LUl6^JU  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HlqCL1\<  
  } r )ZUeHt}w  
 } =\B{)z7@6D  
 SetIcon(m_hIcon, TRUE); // Set big icon \6-x~%xK  
 SetIcon(m_hIcon, FALSE); // Set small icon ,G!M?@Q  
 m_Key.SetCurSel(0); &8_]omuNV  
 RegisterHotkey(); OKNA36cU'  
 CMenu* pMenu=GetSystemMenu(FALSE); h8Q+fHDYv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^ ~:f02[D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (8TB*BhQ_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); F^ 7qLvh  
 return TRUE; // return TRUE unless you set the focus to a control h$)(-_c3  
} -$f~V\M  
}=z_3JfO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uM h[Ht^.  
{ I@+h| n  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J 05@SG':  
 { ym9Z:2g  
  CAboutDlg dlgAbout; 1uZ[Ewl]  
  dlgAbout.DoModal(); N:GSfM@g  
 } z}.y ?#  
 else QO0}-wZR  
 { Ehi)n)HhG"  
  CDialog::OnSysCommand(nID, lParam); (9% ki$=}+  
 } Nz_c]3_j  
}  n0F.Um  
lT#&\JQ  
void CCaptureDlg::OnPaint() @wy|l)%  
{ 7K,Quq.%+  
 if (IsIconic()) /ts=DxCC;  
 { LSQWveZz  
  CPaintDC dc(this); // device context for painting [zl@7X1{_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :i_818h!?[  
  // Center icon in client rectangle g@wF2=  
  int cxIcon = GetSystemMetrics(SM_CXICON); g}"`@H(9r3  
  int cyIcon = GetSystemMetrics(SM_CYICON); Se<]g$eK?5  
  CRect rect; k4fc 5P  
  GetClientRect(&rect); 'KB\K)cD=3  
  int x = (rect.Width() - cxIcon + 1) / 2; aDmyr_f$  
  int y = (rect.Height() - cyIcon + 1) / 2; SF$7WG3Q  
  // Draw the icon 2+zE|I.  
  dc.DrawIcon(x, y, m_hIcon); Rt:k4Q   
 } XI:8_F;Q  
 else Z:DEET!c'k  
 { yI/2 e[  
  CDialog::OnPaint(); PPk\W7G  
 } oFM\L^Y?$$  
} D X GClH  
<k?ofE1o  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7 K.&zn  
{ `Fa49B|`D  
 return (HCURSOR) m_hIcon; WA}<Zme3[  
} mAMi-9  
B?A c  
void CCaptureDlg::OnCancel() U"$Q$ OFs  
{ n X4R  
 if(bTray) bHVAa#  
  DeleteIcon(); &7z79#1NS  
  CDialog::OnCancel(); h07Z.q ;  
} |T?wM/  
AzAD76iNv  
void CCaptureDlg::OnAbout() V ij P;  
{ XndGe=O  
 CAboutDlg dlg; x{4Rm,Dxn  
 dlg.DoModal(); L#sw@UCK  
} RrrW0<Ed  
Z|;<:RKWY  
void CCaptureDlg::OnBrowse() "<o[X ?u  
{ } 8ZCWmd  
 CString str; =B4,H=7Spf  
 BROWSEINFO bi; W}m-5L  
 char name[MAX_PATH]; s2f9 5<B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /2}o:vLj  
 bi.hwndOwner=GetSafeHwnd(); iEx.BQ+  
 bi.pszDisplayName=name; ]=\Mf<  
 bi.lpszTitle="Select folder"; ZeewGa^r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^0"^Xk*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3t<XbHF9  
 if(idl==NULL) BiGB<Jr  
  return; 9$,x^Qx  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *9:oTN  
 str.ReleaseBuffer(); Eu/~4:XN  
 m_Path=str; yM dEH-?/  
 if(str.GetAt(str.GetLength()-1)!='\\') x._IP,vRx^  
  m_Path+="\\"; ?^Sk17G  
 UpdateData(FALSE); yXU-@~  
} { 3``To$  
_&S?uz m  
void CCaptureDlg::SaveBmp() Bvzu{B%  
{ B$~oZ'4v  
 CDC dc; 8N<0|u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \s<7!NAE4  
 CBitmap bm; Ol,;BZHc\  
 int Width=GetSystemMetrics(SM_CXSCREEN); cBf9-k  
 int Height=GetSystemMetrics(SM_CYSCREEN); \PS{/XK  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3wXmX  
 CDC tdc; KTn,}7vZ  
 tdc.CreateCompatibleDC(&dc); @|Z:7n6S  
 CBitmap*pOld=tdc.SelectObject(&bm); P.*J'q 28  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `|K,E  
 tdc.SelectObject(pOld); )6|7L)Dk  
 BITMAP btm; Zu(eYH=Q  
 bm.GetBitmap(&btm); /64jO?mp  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; VM{`CJ2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); AH`n  
 BITMAPINFOHEADER bih; rQiX7  
 bih.biBitCount=btm.bmBitsPixel; :T~Aa(%(  
 bih.biClrImportant=0; xGbr>OqkTX  
 bih.biClrUsed=0; '!`%!Xg  
 bih.biCompression=0; M0!;{1  
 bih.biHeight=btm.bmHeight; #!p=P<4M  
 bih.biPlanes=1; 8+vZ9!7  
 bih.biSize=sizeof(BITMAPINFOHEADER); 51yI W*  
 bih.biSizeImage=size; 7L)1mB.  
 bih.biWidth=btm.bmWidth;  f])?Gw  
 bih.biXPelsPerMeter=0; C("PCD   
 bih.biYPelsPerMeter=0; )/k0*:OMyO  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); M9Gs^  
 static int filecount=0; 1?)iCe  
 CString name; BqZ^I eC$  
 name.Format("pict%04d.bmp",filecount++); ~^/zCPy[w  
 name=m_Path+name; WtI1h`Fo  
 BITMAPFILEHEADER bfh; C%d 4ItB >  
 bfh.bfReserved1=bfh.bfReserved2=0; 2&91C[da0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); PpMZ-f@  
 bfh.bfSize=54+size; &_FNDJ>MCk  
 bfh.bfOffBits=54; q0WW^jwQ  
 CFile bf; a?'3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ zjgK78!<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qG"|,bA  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hZnT`!iFE^  
  bf.WriteHuge(lpData,size); 4W8rb'B!Ay  
  bf.Close(); A/N*Nc  
  nCount++; FtN1ZZ"<*  
 } lEi,duS)  
 GlobalFreePtr(lpData); >V(>2eD'S  
 if(nCount==1) 1_:1cF{w  
  m_Number.Format("%d picture captured.",nCount);  N>`+{  
 else RBx`<iBe  
  m_Number.Format("%d pictures captured.",nCount); i]GBu  
  UpdateData(FALSE); Y~1}B_  
} 'R*gSqx~  
n? "ti  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #%VprcEK  
{ L*tXy>&b.  
 if(pMsg -> message == WM_KEYDOWN) Qpd-uC_Ni  
 { B%6bk.  
  if(pMsg -> wParam == VK_ESCAPE) N&NOh|YS  
   return TRUE; 'R_U,9y`  
  if(pMsg -> wParam == VK_RETURN) r0G#BPgdR  
   return TRUE; hgj#VY$B  
 } fEs957$  
 return CDialog::PreTranslateMessage(pMsg); wlqV1.K  
} XBhWj\`(T  
{+c/$4 <  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *p?b"{_a  
{ ;TSnIC)c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X2@mQ&n  
  SaveBmp(); UEo,:zeN[  
  return FALSE; {EJVZG:&  
} }=A6Jv(j  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 37p0*%a":  
 CMenu pop; ]+0-$t7Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~b\7 qx_a9  
 CMenu*pMenu=pop.GetSubMenu(0); PL~k `L  
 pMenu->SetDefaultItem(ID_EXITICON); =@pm-rI|-  
 CPoint pt; XyS#6D  
 GetCursorPos(&pt); iN<5[ztd  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {DN c7G  
 if(id==ID_EXITICON) {J})f>x<xM  
  DeleteIcon(); 7P/j\frW  
 else if(id==ID_EXIT)  p<*-B  
  OnCancel();  QN_5q5  
 return FALSE; h83ho  
} _Fl]zs<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 74gU 4T  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WY 2b  
 AddIcon(); ?[!.TU?4N  
 return res; IUd>jHp`6  
} aS~k.^N  
fS#/-wugOB  
void CCaptureDlg::AddIcon() x?CjRvT $  
{ @2$PU{dH  
 NOTIFYICONDATA data; f~Kln^  
 data.cbSize=sizeof(NOTIFYICONDATA); oeIB1DaI  
 CString tip; @Jm$<E  
 tip.LoadString(IDS_ICONTIP); :@: R4Ac  
 data.hIcon=GetIcon(0); s #L1:L  
 data.hWnd=GetSafeHwnd(); 8.k"kXU@n  
 strcpy(data.szTip,tip); Fi5,y;]R  
 data.uCallbackMessage=IDM_SHELL; BOwkC;Q[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D VSYH{U4  
 data.uID=98; =Rb,`%  
 Shell_NotifyIcon(NIM_ADD,&data); -8 &f=J)  
 ShowWindow(SW_HIDE); {g/\5Z\b  
 bTray=TRUE; B|extWwu  
} _"WQi}Mm  
I*lq0&  
void CCaptureDlg::DeleteIcon() W!tP sPM  
{ q,:\i+>K*  
 NOTIFYICONDATA data; 6bb=;  
 data.cbSize=sizeof(NOTIFYICONDATA); JC=Bxv  
 data.hWnd=GetSafeHwnd(); 6 Dg[ b  
 data.uID=98; |qI_9#M\(  
 Shell_NotifyIcon(NIM_DELETE,&data); 8kMMQES  
 ShowWindow(SW_SHOW); _&F6As !{  
 SetForegroundWindow(); m k -" U7;  
 ShowWindow(SW_SHOWNORMAL); "r"Y9KODm  
 bTray=FALSE; <EBp X   
} ];uvE? 55  
h+Q ==  
void CCaptureDlg::OnChange() aaaC8;.  
{ Pi8U}lG;  
 RegisterHotkey(); R8],}6,;E}  
} 'kh%^_FH7  
cOUO_xp(  
BOOL CCaptureDlg::RegisterHotkey() Szg<;._J  
{ q!AS}rV  
 UpdateData(); K/%aoTO}  
 UCHAR mask=0; }>Os@]*'^(  
 UCHAR key=0; <|2_1[,sl  
 if(m_bControl) CiMy_`H  
  mask|=4; !o.g2  
 if(m_bAlt) ;bAy 7  
  mask|=2; s#d# *pgzh  
 if(m_bShift) ax 3:rl  
  mask|=1; Mb<KZ_wYOX  
  key=Key_Table[m_Key.GetCurSel()]; @8CD@SDv  
 if(bRegistered){ qA"?5j32  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); MiSFT5$v6  
  bRegistered=FALSE; CLYcg$V  
 } EI_J7J+  
 cMask=mask; X,OxvmDm  
 cKey=key; N!v@!z9Mu  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1Q%.-vs  
 return bRegistered; /;0>*ft4  
} "tark'  
)k1,oUx  
  四、小结 <d^7B9O?&w  
P=@lkF!\#  
  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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