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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: ~'[0-_]=f  
  K>tubLYh  
  一、实现方法 BXCB/:0  
r^m8kYezQ  
  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: `k 5'nnyP  
zree}VqD;5  
#pragma data_seg("shareddata") fnwhkL#8  
HHOOK hHook =NULL; //钩子句柄 O_M2Axm  
UINT nHookCount =0; //挂接的程序数目 vIL'&~C\y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L>&o_bzp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ODbEL/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m=hlim;P,  
static int KeyCount =0; v|WTm#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [T(XwA)  
#pragma data_seg() gtV^6(Y  
?51Y&gOEZ  
  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。 !6R;fD#^s  
"zn<\z$l  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \%qzTk.&r  
TspuZR@2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR su/!<y  
cKey,UCHAR cMask) Cm~Pn "K_]  
{ g p2S   
 BOOL bAdded=FALSE; 2+2Gl7" s  
 for(int index=0;index<MAX_KEY;index++){ /{[Y l[{"<  
  if(hCallWnd[index]==0){ DxFmsjX[L  
   hCallWnd[index]=hWnd; cL]vJ`?Ih  
   HotKey[index]=cKey; .;1tu+S  
   HotKeyMask[index]=cMask; 8,0WHivg  
   bAdded=TRUE; Ly7|:IbC  
   KeyCount++; Hz*5ZIw  
   break; /Vg=+FEO  
  } eNwF<0}  
 } CWTPf1?eB  
 return bAdded; x'4q`xDa  
} .d JX,^  
//删除热键 [dQL6k";b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kgq"b)  
{ Xiy9Oeq2uh  
 BOOL bRemoved=FALSE; <? Z[X{  
 for(int index=0;index<MAX_KEY;index++){ \ r^#a  
  if(hCallWnd[index]==hWnd){ |8bqn^@$t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zA ; 7Nv$3  
    hCallWnd[index]=NULL; &zxqVI$4  
    HotKey[index]=0; / bxu{|.  
    HotKeyMask[index]=0; IpJMq^ Z  
    bRemoved=TRUE; klwC.=?(j"  
    KeyCount--; PQkFzyk  
    break; 4P406,T]r  
   } 6ka, FjJ\  
  } VIXY?Ua  
 } e={X{5z0  
 return bRemoved; xzZ2?z Wi  
} e2~$=f-  
bvxol\7;  
@%oHt*u  
  DLL中的钩子函数如下: X6hp}  
8l?mNapy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _+OnH!G0  
{ 8(6(,WwP}  
 BOOL bProcessed=FALSE; <WHu</  
 if(HC_ACTION==nCode) A>?_\<Gp  
 { .qN|.:6a  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Yq$KYB j  
   switch(wParam) ""; Bq*Y#  
   {  nmH1Wg*aW  
    case VK_MENU: .~nk' m  
     MaskBits&=~ALTBIT; y:m ;_U,%c  
     break; z(8:7 G  
    case VK_CONTROL: gXNlnh%?S  
     MaskBits&=~CTRLBIT; \W,,@ -  
     break; :aIS>6  
    case VK_SHIFT: /S9(rI<'  
     MaskBits&=~SHIFTBIT; `/"rs@  
     break; 17 k9h?s*  
    default: //judge the key and send message Sj[iKCEKtv  
     break; =T?:b8yV  
   } R2e":`0I  
   for(int index=0;index<MAX_KEY;index++){ *N C9S,eSP  
    if(hCallWnd[index]==NULL) /.1yxb#Z?,  
     continue; >!D^F]CH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SJ4+s4!l <  
    { HGwSsoS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `X:o]t@  
     bProcessed=TRUE; A(2\Gfe  
    }  y[C++Q  
   } A"V($:>U  
  } /O^aFIxk  
  else if((lParam&0xc000ffff)==1){ //有键按下 '[Ue0r<jn  
   switch(wParam) c SV`?[a  
   { Jp d|<\Ml  
    case VK_MENU: F3%8E<QZd;  
     MaskBits|=ALTBIT; _K4E6c_  
     break; 7xhBdi[ dQ  
    case VK_CONTROL: yMd<<:Ap  
     MaskBits|=CTRLBIT; o#^(mGj_.  
     break; Bh#?:h&f  
    case VK_SHIFT: KkIgyLM  
     MaskBits|=SHIFTBIT; 6XFLWN-)  
     break; 9i=HZ\s3  
    default: //judge the key and send message 6w"_sK?  
     break; Ue=Je~Ri;9  
   } a7? )x])e  
   for(int index=0;index<MAX_KEY;index++){ x @a3STKT  
    if(hCallWnd[index]==NULL) J [k,S(Y  
     continue; G0izZWc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PX} ~  
    { nB &[R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z>6hK:27  
     bProcessed=TRUE; a(eKb2CX  
    } \Fs+H,S<  
   } - K@mjN  
  } LwI A4$d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <73dXTZ0  
   for(int index=0;index<MAX_KEY;index++){ \C&[BQ\  
    if(hCallWnd[index]==NULL) OpNxd]"T  
     continue; DO^ J=e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 38 -vt,|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eXYf"hU,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 TdCC,/c 3  
   } Qms,kX  
  } QMz6syn4u  
 } M SnRx*-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g0Ff$-#7  
} wAvnj  
*6` };ASK  
  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: ^E#i5d+'N  
. XVW2ISv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); it#,5#Y:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,u<oAI`  
gB)Cmw*  
  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: 9*<=K  
PsMp &~^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0D s W1  
{ jR_o!n~5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #$^vP/"$  
 { O u-/dE%  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 yU{Q`6u T  
  SaveBmp(); Jqp;8DV}  
  return FALSE; v] ?zG&Jh  
 } "G[yV>pxv  
 …… //其它处理及默认处理 %`# HGji)  
} ]Uu:t  
6/=0RTd  
b)(rlX  
  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。 d$gT,+|vu  
$SbgdbX  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 nkxv,_)ZT  
"8#EA<lsS  
  二、编程步骤 F*, e,s  
|nMg.t`8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; yP^C)  
 T1\@4x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; O!U8"Yr$  
`:Bm@eN  
  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; {2v,J]v_[  
SmUj8?6"  
  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; !LX)  
$[xS>iuD  
  5、 添加代码,编译运行程序。 r1A<XP|1?I  
Pl\r|gS;  
三、程序代码 QUO'{;,  
Yf?hl  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL csd~)a nb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) GD -cP5$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_  v[+ ]  
#if _MSC_VER > 1000  {S$61ut  
#pragma once @r*w 84  
#endif // _MSC_VER > 1000 Q{:=z6&  
#ifndef __AFXWIN_H__ U(rY,4'  
#error include 'stdafx.h' before including this file for PCH nSr_sD6"  
#endif gtwUY$  
#include "resource.h" // main symbols {y%cTuC=  
class CHookApp : public CWinApp @d1YN]ede  
{ 3Jh!YzI8  
 public: t[4V1:  
  CHookApp(); $l=&  
  // Overrides R8%%EEB  
  // ClassWizard generated virtual function overrides Rh,a4n?W  
  //{{AFX_VIRTUAL(CHookApp) 'o]kOp@q  
 public: Q`m9I  
  virtual BOOL InitInstance(); xa[)fk$6  
  virtual int ExitInstance(); _C54l  
  //}}AFX_VIRTUAL M/J?$j  
  //{{AFX_MSG(CHookApp) }`uFLBG3  
  // NOTE - the ClassWizard will add and remove member functions here. )jPIBzMys  
  // DO NOT EDIT what you see in these blocks of generated code ! : =f!>_r+  
  //}}AFX_MSG i1 >oRT{Z  
  DECLARE_MESSAGE_MAP() rT"3^,,  
}; kQw%Wpuq[/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #;])/8R%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NyR,@n1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H{et2J<H  
BOOL InitHotkey(); ^iqy|zNtn  
BOOL UnInit(); |*%i]@V=  
#endif + usB$=kJ  
bamQ]>0|>!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _zK ~9/5  
#include "stdafx.h" P\ia ?9  
#include "hook.h" ]RxJ^'a63  
#include <windowsx.h> qHl>d*IZ  
#ifdef _DEBUG r]=Z :  
#define new DEBUG_NEW eqSCE6r9x  
#undef THIS_FILE qx1+'  
static char THIS_FILE[] = __FILE__; ufn% sA  
#endif N#p%^GH  
#define MAX_KEY 100 CxD=8X9m  
#define CTRLBIT 0x04 fl}! V4  
#define ALTBIT 0x02 ZKTY1JW_  
#define SHIFTBIT 0x01 8.zYa(< 2  
#pragma data_seg("shareddata") :ggXVwpe  
HHOOK hHook =NULL; `>Ms7G9S~e  
UINT nHookCount =0; d<cqY<y VA  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey W P9PX  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \gFV6 H?`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3jx/1VV  
static int KeyCount =0; }1EtM/Ni{!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -nQ(.#-n  
#pragma data_seg() x8o/m$[,=u  
HINSTANCE hins; +n>p"+c  
void VerifyWindow(); ix_&os]L_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) GMlJM  
//{{AFX_MSG_MAP(CHookApp) 8gxo{<,9  
// NOTE - the ClassWizard will add and remove mapping macros here. lFN|)(X  
// DO NOT EDIT what you see in these blocks of generated code! 64qqJmG 3  
//}}AFX_MSG_MAP q&2L@l3A  
END_MESSAGE_MAP() UB,0c)   
`b KJ  
CHookApp::CHookApp() KU^|T2s%  
{ jx#9  
 // TODO: add construction code here, L0;XzZ S  
 // Place all significant initialization in InitInstance B8~bx%)3T  
} zyB>peAp6j  
4YgO1}%G  
CHookApp theApp; UCo`l~K)qg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z]XjN@j"  
{ {8"Uxj_6V  
 BOOL bProcessed=FALSE; > zfFvx_q  
 if(HC_ACTION==nCode) 3/ '5#$  
 { '<U4D  
  if((lParam&0xc0000000)==0xc0000000){// Key up AAF']z<4_"  
   switch(wParam) B:VGa<lx5  
   { ](^FGz  
    case VK_MENU: zm mkmTp  
     MaskBits&=~ALTBIT; CT/>x3o  
     break; 5fy{!  
    case VK_CONTROL: a$3] `  
     MaskBits&=~CTRLBIT; +E']&v$  
     break; Z^c\M\`7  
    case VK_SHIFT: O4cBn{Dq9  
     MaskBits&=~SHIFTBIT; sD$K<nyz  
     break; G2&,R{L6w  
    default: //judge the key and send message :W#?U yo  
     break; (QS 0  
   } {s0!hp  
   for(int index=0;index<MAX_KEY;index++){ |$C fm}  
    if(hCallWnd[index]==NULL) \olY)b[  
     continue; Z>[n~{-,p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0|kH0c,T-  
    { gnadx52FP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [QIQpBL  
     bProcessed=TRUE; 7- |N&u  
    } uFuP%f!yY  
   } ?CldcxM#  
  } 9&zQ 5L>  
  else if((lParam&0xc000ffff)==1){ //Key down sJMpF8   
   switch(wParam) IEe;ygL#  
   { 'vV+Wu#[  
    case VK_MENU: 'Hsd7Dpi}  
     MaskBits|=ALTBIT; n5y0$S/ D  
     break; y+ 4#Iy  
    case VK_CONTROL: K j~!E H"  
     MaskBits|=CTRLBIT; &7 9F Uac  
     break; >D Ai-`e  
    case VK_SHIFT: ]GDjR'[z  
     MaskBits|=SHIFTBIT; fg/hUUl  
     break; 4KR$sKq$q  
    default: //judge the key and send message Rm}G4Pq  
     break; \hdil`{>  
   } ;(rK^*`fO  
   for(int index=0;index<MAX_KEY;index++) Lb?0<  
   { o(C;;C(*{  
    if(hCallWnd[index]==NULL) jW{bP_,"  
     continue; ZAgtVbO7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >`<qa!9  
    { o7^0Lo5Z?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .LGA0  
     bProcessed=TRUE; xyHv7u%*  
    } z'*{V\  
   } \wR\i^  
  } bc;?O`I<  
  if(!bProcessed){ o*3\xg  
   for(int index=0;index<MAX_KEY;index++){ -"I9`  
    if(hCallWnd[index]==NULL) 3_>=Cv}  
     continue; CSH*^nk':O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DT_%Rz~<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @+a}O  
   } nd[Ja_h  
  } \(}pm#O  
 } Wiyiq )^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `/9I` <y  
} {"*_++|  
pb G5y7  
BOOL InitHotkey() j=c< Lo`  
{ LP/SblE  
 if(hHook!=NULL){ a*t>Ks'C  
  nHookCount++; ZiRCiQ/?  
  return TRUE; k"6v& O  
 } ?J-D6;  
 else \YHl(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +|H,N7a<  
  if(hHook!=NULL) GiKhdy  
   nHookCount++; .*Bd'\:F/q  
  return (hHook!=NULL); ~%h&ELSw  
} >U(E \`9D  
BOOL UnInit() ! %B-y 9\  
{ oi8M6l  
 if(nHookCount>1){ U;*O7K=P  
  nHookCount--; ce*?crOV  
  return TRUE; s#(7D3Pr#  
 } L* ScSxw  
 BOOL unhooked = UnhookWindowsHookEx(hHook); cH5RpeP  
 if(unhooked==TRUE){ $j \jT  
  nHookCount=0; ]=59_bkD:s  
  hHook=NULL; "1`w>(=  
 } %-B wK  
 return unhooked; yZ]?-7  
} [[xnp;-;  
I:0dz:T7*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a-AA$U9hj  
{ [ua[A;K  
 BOOL bAdded=FALSE; V{ ~~8b1E  
 for(int index=0;index<MAX_KEY;index++){ c7R&/JV  
  if(hCallWnd[index]==0){ z2Z}mktP  
   hCallWnd[index]=hWnd; .EvP%A m  
   HotKey[index]=cKey; B1]FB|0's  
   HotKeyMask[index]=cMask; =1xVw5^F  
   bAdded=TRUE; Cq3Au%7  
   KeyCount++; cQsSJBZ[v5  
   break; ]:m4~0^#-(  
  } MP.ye|i4Q  
 } Kjpsz];  
 return bAdded; ,XI=e=  
} g4{0  
F~~9/#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F%4N/e'L  
{ %Aa_Bumf*:  
 BOOL bRemoved=FALSE; )6eFYt%c  
 for(int index=0;index<MAX_KEY;index++){ K92M9=>  
  if(hCallWnd[index]==hWnd){ @, AB 2D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rv<qze;?|  
    hCallWnd[index]=NULL; T5}5uk9  
    HotKey[index]=0; g|h;*  
    HotKeyMask[index]=0; Z_7TD)  
    bRemoved=TRUE; Fq`@sM $  
    KeyCount--; %NfH`%`  
    break; 02)Ybp6y  
   } +UX} "m~W  
  } 2sVDv@2  
 } c8HETs1  
 return bRemoved; qk>M~,  
} t;:Yf  
$Rn9*OKr  
void VerifyWindow() C;#gy-  
{ P7REE_<1  
 for(int i=0;i<MAX_KEY;i++){ }=.C~f]A  
  if(hCallWnd!=NULL){ ca,c+5  
   if(!IsWindow(hCallWnd)){ c{39,oF  
    hCallWnd=NULL; ]7RK/Zu i  
    HotKey=0; n A%8 bZ+  
    HotKeyMask=0; XpA|<s  
    KeyCount--; )Y"t$Iw"  
   } uKB V`I  
  } : qV|rih_Q  
 } '#~Sb8   
} z6h/C {  
]BTISaL-R  
BOOL CHookApp::InitInstance() u'gsIuRJ  
{ Q5IN1 ^=HF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); QUF1_Sa  
 hins=AfxGetInstanceHandle(); " Lh XR  
 InitHotkey(); |/Y!R>El  
 return CWinApp::InitInstance(); }:1qK67S  
} VTi; y{  
@&9< )1F  
int CHookApp::ExitInstance() 84s:cO  
{ 2P{! n#"  
 VerifyWindow(); \lyHQ-gWhc  
 UnInit(); = N:5#A  
 return CWinApp::ExitInstance(); .TNJuuO  
} Zc*#LsQh.`  
pBn;:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P(3$XMx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n@S|^cH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^ ,[gO#hgz  
#if _MSC_VER > 1000 };*&;GFe  
#pragma once A-eCc#I  
#endif // _MSC_VER > 1000 =,&{ &m)  
e'=#G$S?g  
class CCaptureDlg : public CDialog `qZ@eGZ z  
{ Rn{X+b.  
 // Construction Bu{%mm(  
 public: RhE|0N=  
  BOOL bTray; zP/SDW   
  BOOL bRegistered; 0 4oMgH>Vd  
  BOOL RegisterHotkey(); XHY,;4  
  UCHAR cKey; L rV|Y~  
  UCHAR cMask; "\M3||.!  
  void DeleteIcon(); s5X51#J#~  
  void AddIcon(); En0hjXa  
  UINT nCount; 0,iG9D 7  
  void SaveBmp(); ? :F Jc[J  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kn2W{*wD  
  // Dialog Data _cJ\A0h^  
  //{{AFX_DATA(CCaptureDlg) x7xQrjE  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1z@ ncqe  
  CComboBox m_Key; 5rJ7CfVq  
  BOOL m_bControl; _$oE'lat  
  BOOL m_bAlt; ~Q=^YZgn8  
  BOOL m_bShift; :K!L-*>A9  
  CString m_Path; |8{ \j*3  
  CString m_Number; 2,.8 oa(  
  //}}AFX_DATA 4*UKR!sr  
  // ClassWizard generated virtual function overrides R]o2_r7N"}  
  //{{AFX_VIRTUAL(CCaptureDlg) q-e3;$  
 public: Su'l &]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T\Jm=+]c!  
 protected: Owh:(EJ"d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7}tXF  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /8P7L'Rb  
  //}}AFX_VIRTUAL <V#]3$(S  
  // Implementation #O7phjzgD  
 protected: @j%7tfW  
  HICON m_hIcon; xI~c~KC  
  // Generated message map functions "b`3   
  //{{AFX_MSG(CCaptureDlg) 1#2L9Bi  
  virtual BOOL OnInitDialog(); ;|oem\dKv  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,LL=b-Es  
  afx_msg void OnPaint(); xJFxrG'c  
  afx_msg HCURSOR OnQueryDragIcon(); E FBvi  
  virtual void OnCancel(); "h&[6-0'  
  afx_msg void OnAbout(); qc6d,z/  
  afx_msg void OnBrowse(); \u6/nvZ]N  
  afx_msg void OnChange(); 6{ pg^K  
 //}}AFX_MSG jYW-}2L  
 DECLARE_MESSAGE_MAP() 2JHV*/Q  
}; a3:1`c/~\  
#endif D5!I{hp"  
Q*/jQC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5"Y:^_8  
#include "stdafx.h" hP jL  
#include "Capture.h" )N&95\ u  
#include "CaptureDlg.h" ; VQ:\f G  
#include <windowsx.h> L0ZAF2O  
#pragma comment(lib,"hook.lib") 85+w\KuEY  
#ifdef _DEBUG M|7{ZE`Y  
#define new DEBUG_NEW <ol? 9tm  
#undef THIS_FILE +^%0/0e  
static char THIS_FILE[] = __FILE__; XZ|\|(6Cc  
#endif {.r9l  
#define IDM_SHELL WM_USER+1 H8!lSRq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0|(6q=QK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _No<fz8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0Rh*SoYrC  
class CAboutDlg : public CDialog A&Cs (e  
{ E |=]k  
 public: i6E~]&~.v  
  CAboutDlg();  ;.~D!  
  // Dialog Data [Y6ZcO/-i  
  //{{AFX_DATA(CAboutDlg) =%+xNOdN7?  
  enum { IDD = IDD_ABOUTBOX }; L#/<y{  
  //}}AFX_DATA ,*;g+[Bhpl  
  // ClassWizard generated virtual function overrides ~&+8m=   
  //{{AFX_VIRTUAL(CAboutDlg) G\*`%B_ n  
 protected: A)nE+ec1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {CGk9g" `  
  //}}AFX_VIRTUAL ymA8`k5>@  
  // Implementation `(@{t:L  
 protected: w#;y  
  //{{AFX_MSG(CAboutDlg) SdJkno  
  //}}AFX_MSG t},71Ry  
  DECLARE_MESSAGE_MAP() 8|rlP  
}; 7*47mJyc  
}kk[lvhJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N!13QI H  
{ `W4Is~VVv  
 //{{AFX_DATA_INIT(CAboutDlg) 6yMaW eT  
 //}}AFX_DATA_INIT K)9f\1\  
} V_T~5%9Fy  
qWI8 >my11  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BU%gXr4Ra  
{ Gk<6+.c~  
 CDialog::DoDataExchange(pDX); 4pFoSs?\  
 //{{AFX_DATA_MAP(CAboutDlg) e]smnf  
 //}}AFX_DATA_MAP 6+yA4pRSd  
} R%;dt<Dh  
8jgamG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !GZ{UmwA  
 //{{AFX_MSG_MAP(CAboutDlg) tnw6[U!rh=  
 // No message handlers CSMx]jbb  
 //}}AFX_MSG_MAP t` zPx#])  
END_MESSAGE_MAP() 'tq4-11xB  
FdMTc(>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e:=+~F(f  
: CDialog(CCaptureDlg::IDD, pParent) .OD{^Kq2  
{ 4% 2MY\  
 //{{AFX_DATA_INIT(CCaptureDlg) (APGz,^9#  
  m_bControl = FALSE;  6Xt c3  
  m_bAlt = FALSE; $`Aps7A  
  m_bShift = FALSE; 2QV|NQSl  
  m_Path = _T("c:\\"); Iyt.`z  
  m_Number = _T("0 picture captured."); !Bb^M3iA  
  nCount=0; ngH_p>  
  bRegistered=FALSE; h=ko_/<  
  bTray=FALSE; ^1[u'DW4  
 //}}AFX_DATA_INIT 6 kAXE\T  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s!/Q>A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fMRMQR=6B  
} UjS,<>fm  
/@K1"/fqH  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o,=dm@j  
{ &y:SK)  
 CDialog::DoDataExchange(pDX); 6>/g`%`N  
 //{{AFX_DATA_MAP(CCaptureDlg) e}W|wJ):j@  
  DDX_Control(pDX, IDC_KEY, m_Key); MrpT5|t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  76EMS?e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >3y:cPTM5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !a9/8U_>XF  
  DDX_Text(pDX, IDC_PATH, m_Path); >66v+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @Yh%.#\i%  
 //}}AFX_DATA_MAP &, WQr  
} YW^sf,zQ  
%ZJ;>a#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $U}GX'1LZ  
//{{AFX_MSG_MAP(CCaptureDlg) bF? {  
 ON_WM_SYSCOMMAND() O.OSLezTQ  
 ON_WM_PAINT() R(DlJ  
 ON_WM_QUERYDRAGICON() Z=>#|pW,)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) EB[B0e 7}  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xX{gm'3UYa  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 47 9yG/+\  
//}}AFX_MSG_MAP g2GHsVS  
END_MESSAGE_MAP() c=~FXV!  
Vw b6QIs  
BOOL CCaptureDlg::OnInitDialog() /}RW~ax  
{ $rmfE  
 CDialog::OnInitDialog(); @# &y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mdukl!_x  
 ASSERT(IDM_ABOUTBOX < 0xF000); f#zm}+,`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kY`L[1G$  
 if (pSysMenu != NULL) _0qp!-l}  
 { DsF<P@O6  
  CString strAboutMenu; ffS]%qa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R3@$ao  
  if (!strAboutMenu.IsEmpty()) Fs;_z9ej-u  
  {  .'^Pg  
   pSysMenu->AppendMenu(MF_SEPARATOR); L:RMZp*bK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G,h=5y9_J  
  } ^`oyf{w@  
 } Ra^GbT|Z  
 SetIcon(m_hIcon, TRUE); // Set big icon nn6&`$(Q~  
 SetIcon(m_hIcon, FALSE); // Set small icon Cw&U*H  
 m_Key.SetCurSel(0); Tjza3M  
 RegisterHotkey(); 8yn}|Y9Fu  
 CMenu* pMenu=GetSystemMenu(FALSE); =$awUy  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); g:CMIe4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); RS[>7-9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m8<l2O=m  
 return TRUE; // return TRUE unless you set the focus to a control /l$>W<}@  
}  K na  
KcNh3CR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tu0agSpU  
{ e-e*%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,xsFBNCC  
 { )%]`uj>*[  
  CAboutDlg dlgAbout;  w#\*{EN  
  dlgAbout.DoModal(); uj9IK  
 } ) v^;"q"  
 else qx<h rC0Z&  
 { \-~TW4dYe  
  CDialog::OnSysCommand(nID, lParam); Uk|(VR9  
 } @XFy^?  
} r__Y{&IO  
=dT sGNz  
void CCaptureDlg::OnPaint() b(|1DE0Cv  
{ mu}T,+9\  
 if (IsIconic()) Kn+m9  
 { JVeb$_0k  
  CPaintDC dc(this); // device context for painting Ju.B!)uS#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WaYT7 :  
  // Center icon in client rectangle +Q6}kbDI  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1Ydym2  
  int cyIcon = GetSystemMetrics(SM_CYICON); maR5hgWCHe  
  CRect rect; ([a[ fi  
  GetClientRect(&rect); f|X./J4Bl  
  int x = (rect.Width() - cxIcon + 1) / 2; ?oO<PR}y  
  int y = (rect.Height() - cyIcon + 1) / 2; n; fUwon  
  // Draw the icon 9>na3ISh  
  dc.DrawIcon(x, y, m_hIcon); +Pm yFJH  
 } (r+#}z}  
 else ?Wz rv&E2  
 { |VRzIA4M\  
  CDialog::OnPaint(); *Af:^>mh  
 } [exIK  
} jLu`DKB  
K}p!W"!o  
HCURSOR CCaptureDlg::OnQueryDragIcon() &E&e5(&$  
{ 8Qt'Y9|  
 return (HCURSOR) m_hIcon;  iI(7{$y  
} 1"5-doo  
R"`7aa6  
void CCaptureDlg::OnCancel() wa*/Am9;~  
{ 5??\[C^"}  
 if(bTray) }- P ='AyL  
  DeleteIcon(); "=97:H{!  
  CDialog::OnCancel(); OPsg3pW!]  
} =Vm"2g,aA  
T2^0Q9E?  
void CCaptureDlg::OnAbout() ) ]x/3J@  
{ 43 h0i-%1  
 CAboutDlg dlg; (d2|r)O  
 dlg.DoModal(); RiX~YL eM  
} u79,+H@ep  
ZfYva(zP{Q  
void CCaptureDlg::OnBrowse() ^ A`@g4!  
{ O8drR4 Pt  
 CString str; /X_g[*]?  
 BROWSEINFO bi; `pzXh0}|  
 char name[MAX_PATH]; 05cyWg9a  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \Gk4J<  
 bi.hwndOwner=GetSafeHwnd(); E8=8OX/{Y  
 bi.pszDisplayName=name; u'BuZF  
 bi.lpszTitle="Select folder"; :"4Pr/}rT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; c{dge/2yb  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8(EK17rE `  
 if(idl==NULL) 6.!Cm$l  
  return; 8- U1Y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Qwm#6{5  
 str.ReleaseBuffer(); ;/Z9M"!u[  
 m_Path=str; `Y~EL?  
 if(str.GetAt(str.GetLength()-1)!='\\') lnk`D(>W  
  m_Path+="\\"; Gz9w1[t  
 UpdateData(FALSE); `N69xAiy  
} A1A/OU<Vb  
%ur_DQ  
void CCaptureDlg::SaveBmp() Z`=[hu  
{ ,r-l^I3<  
 CDC dc; lj4D: >Ov  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); UtebSQ+h\  
 CBitmap bm; 1j7sJ" *  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?/ @~ d  
 int Height=GetSystemMetrics(SM_CYSCREEN); K5fL{2V?  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IP 9{vk  
 CDC tdc; .%(Q*ioDh  
 tdc.CreateCompatibleDC(&dc); cCoa3U/  
 CBitmap*pOld=tdc.SelectObject(&bm); ]H4T80wm&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 61W ms@D%  
 tdc.SelectObject(pOld); ;%j1'VI  
 BITMAP btm; _rz*7-ks=  
 bm.GetBitmap(&btm); ]}~[2k.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; H~IN<3ko  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I-QaR  
 BITMAPINFOHEADER bih; .9<  i  
 bih.biBitCount=btm.bmBitsPixel; x! A.**  
 bih.biClrImportant=0; >Bj+!)96q  
 bih.biClrUsed=0; _djr>C=H"  
 bih.biCompression=0; oTPPYi[r  
 bih.biHeight=btm.bmHeight; 1,tM  
 bih.biPlanes=1; f"=1_*eH  
 bih.biSize=sizeof(BITMAPINFOHEADER); s:6pPJL  
 bih.biSizeImage=size; py9HUyr5eZ  
 bih.biWidth=btm.bmWidth; 'ow`ej  
 bih.biXPelsPerMeter=0; B4yC"55  
 bih.biYPelsPerMeter=0; *[-% .=[7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >>ncq$  
 static int filecount=0; lAxbF  
 CString name; 0 s-IW  
 name.Format("pict%04d.bmp",filecount++); r pv`%  
 name=m_Path+name; gRk%ObJGqm  
 BITMAPFILEHEADER bfh; hf/6VlZ  
 bfh.bfReserved1=bfh.bfReserved2=0; t_-1sWeA!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [q/tKdo@  
 bfh.bfSize=54+size; \Qh{uk[  
 bfh.bfOffBits=54; x>?jfN,e  
 CFile bf; {g:I5 A#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ndIf1}   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 39|4)1e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1@j0kTJ~m  
  bf.WriteHuge(lpData,size); c Bl F  
  bf.Close(); =,/08Cs  
  nCount++; D{]t50a.  
 } &vf%E@<  
 GlobalFreePtr(lpData); +wAH?q8f  
 if(nCount==1) v[r5!,F  
  m_Number.Format("%d picture captured.",nCount); 1 h.=c  
 else )}-,4Iu%  
  m_Number.Format("%d pictures captured.",nCount); &B</^:  
  UpdateData(FALSE); S}/?L m}  
} ?Mb 'l4  
8b0!eB#_Ee  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !ys82  
{ 4xg7 oo0iJ  
 if(pMsg -> message == WM_KEYDOWN) /.'tfy $  
 { y|BRAk&n  
  if(pMsg -> wParam == VK_ESCAPE) 8E m X  
   return TRUE; "Dc6kn^}3  
  if(pMsg -> wParam == VK_RETURN) $c!cO" U  
   return TRUE; d+1q[,-  
 } 9 a ED6  
 return CDialog::PreTranslateMessage(pMsg); :|s!_G<  
} G8w<^z>pTg  
O>Vb7`z0<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \"]vSx>  
{ S1iF1X(+?X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ pZS0;T]W,  
  SaveBmp(); ZeUA  e  
  return FALSE; 03WLVP@  
} ewNzRH,b  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $*035f  
 CMenu pop; "k)}qI{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Osb#<9{}  
 CMenu*pMenu=pop.GetSubMenu(0); :u%Jrc (W  
 pMenu->SetDefaultItem(ID_EXITICON); 4,8=0[eRG  
 CPoint pt; N3D{t\hg  
 GetCursorPos(&pt); )jM' x&Vg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =l  %  
 if(id==ID_EXITICON) e/pZLj]M  
  DeleteIcon(); tevB2'3^  
 else if(id==ID_EXIT) i'GBj,:  
  OnCancel(); q~[@(+zP5  
 return FALSE; *} pl  
} W| z djb  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1Na*7|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4z^ ?3@:K  
 AddIcon(); >vDa`|g  
 return res; cmpT_51~O  
} Vv"JN?dHi  
aZ[ aZU  
void CCaptureDlg::AddIcon() 1:7 uS.  
{ +d7sy0  
 NOTIFYICONDATA data; n+C]&6-b  
 data.cbSize=sizeof(NOTIFYICONDATA); SLzxF uV  
 CString tip; 8 JOfx  
 tip.LoadString(IDS_ICONTIP); 'y(;:Kc  
 data.hIcon=GetIcon(0); ea"!:cL(g  
 data.hWnd=GetSafeHwnd(); }:5_vH0  
 strcpy(data.szTip,tip); Pc+8CuN?  
 data.uCallbackMessage=IDM_SHELL; mVJW"*}8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1o&] =(  
 data.uID=98; IFrq\H0  
 Shell_NotifyIcon(NIM_ADD,&data); %\5 wHT+)  
 ShowWindow(SW_HIDE); 3#{{+5G  
 bTray=TRUE; 83 O+`f  
} {u3eel  
lzJ[`i.  
void CCaptureDlg::DeleteIcon() "pP5;*^f  
{ X2X.&^  
 NOTIFYICONDATA data; So&an !  
 data.cbSize=sizeof(NOTIFYICONDATA); zh5$$*\  
 data.hWnd=GetSafeHwnd(); ]g#ur@Y%  
 data.uID=98; |'w_5?|4  
 Shell_NotifyIcon(NIM_DELETE,&data); S,9}p 1  
 ShowWindow(SW_SHOW); 8<,b5  
 SetForegroundWindow(); PNm WZW*  
 ShowWindow(SW_SHOWNORMAL); wA@y B"  
 bTray=FALSE; 'z'q)vcr  
} $$U Mc-Pq  
Who7{|M\'  
void CCaptureDlg::OnChange() jwm2ZJW  
{ h/I'9&J>*  
 RegisterHotkey(); I! s&m%s  
} ^tWt"GgC  
-8sm^A>C  
BOOL CCaptureDlg::RegisterHotkey() K+3dwQo  
{ yc./:t1at>  
 UpdateData(); >(v%"04|e  
 UCHAR mask=0; ?^F*M#%?  
 UCHAR key=0; K k 5 vC{  
 if(m_bControl) I)wjTTM5  
  mask|=4; 5|&:l8=  
 if(m_bAlt) Jr0D:  
  mask|=2; Oeua<,]Z~  
 if(m_bShift) ?vHow$  
  mask|=1; 4>q^W$  
  key=Key_Table[m_Key.GetCurSel()]; tTWeOAF  
 if(bRegistered){ ya!RiHj  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0((3q'[ <  
  bRegistered=FALSE; U}H2!et&,)  
 } kOv2E]  
 cMask=mask; [;bZQ6JR  
 cKey=key; ( K5w0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I\NiA>c  
 return bRegistered; Q.5C$I  
} gv&%2e}_  
nZ;h&N -_-  
  四、小结 +f{CfWIKs  
.'3&!#3  
  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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