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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: n\8;4]n  
  DK8eFyG^2  
  一、实现方法  AnK-\4  
5g9lO]WDI  
  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: 4FK|y&p4r  
$89hkUuTu^  
#pragma data_seg("shareddata") q3a`Y)aVB  
HHOOK hHook =NULL; //钩子句柄 4 [2^#t[  
UINT nHookCount =0; //挂接的程序数目 R%)ZhG*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 [J4 Aig  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P70\ |M0~y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey DA'A-C2  
static int KeyCount =0; f>$Ld1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;Ml??B]C  
#pragma data_seg() M{#  
!Z +4FwF  
  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。 {k.Dy92  
>iefEv\  
  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: 1T(:bM_t`7  
3QlV,)}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6*3J3Lc_<  
cKey,UCHAR cMask) ^+Ho#]  
{ t[Dg)adc  
 BOOL bAdded=FALSE; }1<_  
 for(int index=0;index<MAX_KEY;index++){ 2,.%]U  
  if(hCallWnd[index]==0){ FwU*]wx|{  
   hCallWnd[index]=hWnd; gY'w=(/`  
   HotKey[index]=cKey; P e_mX*0  
   HotKeyMask[index]=cMask; {=]1]IWt  
   bAdded=TRUE; ,0ZkE}<=w  
   KeyCount++; \wW'Hk=  
   break; (x7AV$N  
  } Y@WCp  
 } ? U~}uG^  
 return bAdded; Ta;'f7Oz  
} 5r1{l%?  
//删除热键 >Xz P'h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +^!;J/24  
{ HD"Pz}k4  
 BOOL bRemoved=FALSE; mQ#E{{:H+  
 for(int index=0;index<MAX_KEY;index++){ CS[[TzC=5  
  if(hCallWnd[index]==hWnd){ P $4h_dw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vwZd@%BO  
    hCallWnd[index]=NULL; B/#tR^R  
    HotKey[index]=0; ofe SGx  
    HotKeyMask[index]=0; OE,uw2uaT  
    bRemoved=TRUE; >?b<)Q*<  
    KeyCount--; utk'joo  
    break; slSQ\;CDA  
   } 2I!STP{!l  
  } `? ayc/TK  
 } 8ut:cCrmg  
 return bRemoved; z0ULB? *"  
} u+7B-l=u*  
YLc 2:9  
`V N $ S  
  DLL中的钩子函数如下: EA )28]Y.  
A/kRw'6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w3j51v` 0'  
{ Z,~"`9>Ss  
 BOOL bProcessed=FALSE; IEb"tsel  
 if(HC_ACTION==nCode) .:eNL]2%:  
 { ]V9z)uz  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .BLF7> M1  
   switch(wParam) fneg[K  
   {  Z  Mp  
    case VK_MENU: ![H!Y W'  
     MaskBits&=~ALTBIT; {bF95Hs-  
     break; .;gK*`G2W)  
    case VK_CONTROL: ;1Kxqp z_i  
     MaskBits&=~CTRLBIT; IT \Pj_  
     break; oYWcX9R  
    case VK_SHIFT: [.e Y xZ{=  
     MaskBits&=~SHIFTBIT; :sT\-MpQvn  
     break; <,S0C\la=  
    default: //judge the key and send message !*8x>,/>  
     break; s }P-4Sg  
   } A=X2zm>9  
   for(int index=0;index<MAX_KEY;index++){ {V& 2k9*  
    if(hCallWnd[index]==NULL) Up|\&2_  
     continue; ZB-+ bY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -"L)<J@gQ?  
    { h-VpX6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 13s0uyYU<m  
     bProcessed=TRUE;  YM9oVF-  
    } A[juzOn\  
   } h3^ &,U  
  } amI$0  
  else if((lParam&0xc000ffff)==1){ //有键按下 &lYKi3}x  
   switch(wParam) Zp|LCE"  
   { "i$uV3d  
    case VK_MENU: }vOUf# ^k  
     MaskBits|=ALTBIT; /*GRE#7S  
     break; cK.T=7T  
    case VK_CONTROL: S fE^'G\  
     MaskBits|=CTRLBIT; W-Cf#o  
     break; >/Z#{;kOz  
    case VK_SHIFT: Meh?FW||5  
     MaskBits|=SHIFTBIT; A%u@xL,_  
     break; v |/IN  
    default: //judge the key and send message +4emkDTdR  
     break;  U4#[>*  
   } t;+6>sTu  
   for(int index=0;index<MAX_KEY;index++){ QjfQoT F  
    if(hCallWnd[index]==NULL) |Iy55~hK`  
     continue; OwGl&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t/cj z/]  
    { 1r}fnT<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =+gp~RR,  
     bProcessed=TRUE; NF=FbvNe  
    } 6Rn_@_Nn)f  
   } $;*YdZ`q  
  } vx=I3o  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n5_r 3{  
   for(int index=0;index<MAX_KEY;index++){ '3uj6Wq2  
    if(hCallWnd[index]==NULL) zx\N^R;Jq  
     continue; :>lica_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R<mLG $  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WfVkewuPo  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 amf=uysr  
   } MBCA%3z08  
  } h Ia{s)  
 } 9frx60  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r @~T}<I  
} )61CrQiY  
~4Is   
  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: S[UHx}.  
{Ny\9r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &)Z8Qu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  >p!d(J?  
(H9%a-3  
  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: bxP>  
;?;D(%L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |bDN~c:/  
{ K G~](4JE(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O#A1)~  
 { S6H=(l58  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qce#  
  SaveBmp(); q 9qmz[  
  return FALSE; k=Ef)'  
 } lg;Y}?P  
 …… //其它处理及默认处理 `<t{NJ&f  
} e%G- +6  
~0?p @8  
S$]:3  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ORa!84L  
&F\J%#{  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 6f=/vRAh$  
p'k stiB  
  二、编程步骤 @Risab n  
,@!8jar@w}  
  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"; xpyb&A  
*NV`6?o@6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uYL6g:]+ZC  
)F? 57eh  
  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; /+RNPQO O  
*wp'`3y}  
  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; !U>"H8}dv  
aJMh>  
  5、 添加代码,编译运行程序。 qx{.`AaZW  
&7Ixf?e!K  
三、程序代码 `#fOY$#XB  
2xe_Q70II  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B\|>i~u(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v}z o v Ei  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ LO.4sO  
#if _MSC_VER > 1000 T9Vyj3!i_  
#pragma once QY+#Vp<`  
#endif // _MSC_VER > 1000 #2ZXYH}  
#ifndef __AFXWIN_H__ &t%CuU]/@  
#error include 'stdafx.h' before including this file for PCH B<1*p,z  
#endif { r&M  
#include "resource.h" // main symbols -xXNzC   
class CHookApp : public CWinApp 8tA.d.8  
{ wt2S[:!p  
 public: + y.IDn^  
  CHookApp(); ,_rarU)[J  
  // Overrides CG9X3%xO%  
  // ClassWizard generated virtual function overrides )[oU|!@  
  //{{AFX_VIRTUAL(CHookApp) <O5;w  
 public: RMC|(Q<  
  virtual BOOL InitInstance(); `N(.10~  
  virtual int ExitInstance(); xxkP4,(p  
  //}}AFX_VIRTUAL *`}_e)(k  
  //{{AFX_MSG(CHookApp) ? |8&!F  
  // NOTE - the ClassWizard will add and remove member functions here. ,zXL8T  
  // DO NOT EDIT what you see in these blocks of generated code ! #EHBS~^  
  //}}AFX_MSG phXVuQ  
  DECLARE_MESSAGE_MAP() ZX'{o9+w5  
}; TP{a*ke^5,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); V2VsJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h!K B%4V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IJ4"X#Q/  
BOOL InitHotkey(); %- A8`lf<  
BOOL UnInit(); 2)j\Lg_M  
#endif 1.,mNY^UN  
d`~#uN {  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1xguG7  
#include "stdafx.h" c+a f=ac  
#include "hook.h" f{AgKW9"  
#include <windowsx.h> ,dVCbAS@  
#ifdef _DEBUG (la<X <w  
#define new DEBUG_NEW sx]?^KR:  
#undef THIS_FILE uTl:u  
static char THIS_FILE[] = __FILE__; /kw4":{]  
#endif yN>"r2   
#define MAX_KEY 100 MT6kJDyLu  
#define CTRLBIT 0x04 ,o9)ohw  
#define ALTBIT 0x02 !5B9:p~-  
#define SHIFTBIT 0x01 G4x.''r&Sl  
#pragma data_seg("shareddata") Z;>~<#!4  
HHOOK hHook =NULL; J`RNik*>  
UINT nHookCount =0; IN%>46e`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }2NH>qvY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT =fsaJ@q ,R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d:pp,N~2o  
static int KeyCount =0; h.?[1hT4R  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "L8V!M_e  
#pragma data_seg() zl: u@!'  
HINSTANCE hins; \Flq8S/t^  
void VerifyWindow(); Ap!UX=HBb  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +XpRkX&-  
//{{AFX_MSG_MAP(CHookApp) ]UgA z  
// NOTE - the ClassWizard will add and remove mapping macros here. ~JZ Lfw  
// DO NOT EDIT what you see in these blocks of generated code! /yykOvUO  
//}}AFX_MSG_MAP '|d (<.[  
END_MESSAGE_MAP() `%ENGB|  
O"#`i{^?2  
CHookApp::CHookApp() Q?"[zX1  
{ /6q/`vx@  
 // TODO: add construction code here, E`?BaCrG~  
 // Place all significant initialization in InitInstance cEqh|Q  
} P);Xke  
)K?GAj]Pq  
CHookApp theApp; ! 4oIx`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5t<]|-i!  
{ #>- rKv.A  
 BOOL bProcessed=FALSE; 6VE >$`m  
 if(HC_ACTION==nCode) ##s !-.T  
 { i3%~Gc63  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~qqtFjlG^  
   switch(wParam) q~w;C([k_  
   { pbzbh&Y  
    case VK_MENU: ^&6NB)6  
     MaskBits&=~ALTBIT; L3GJq{t  
     break; 'D/AL\1{p(  
    case VK_CONTROL: +.N;h-'  
     MaskBits&=~CTRLBIT; 4z*_,@OA  
     break; @[FFYVru  
    case VK_SHIFT: UpIf t=@P  
     MaskBits&=~SHIFTBIT; u}:O[DG  
     break; Tb)x8-0  
    default: //judge the key and send message {30<Vc=  
     break; CYn}wkz  
   } c|.:J]  
   for(int index=0;index<MAX_KEY;index++){ PaDT)RrEM  
    if(hCallWnd[index]==NULL) 0iL8i#y*  
     continue; FRg6-G/S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )F$Stg3e  
    { 41zeN++  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZbrE m  
     bProcessed=TRUE; IRU2/Ycg  
    } R/wSGP`W  
   } s{,e^T  
  } /,>.${,;u  
  else if((lParam&0xc000ffff)==1){ //Key down X<QE]RZ  
   switch(wParam) J6%op{7/  
   { ^KaMi_--  
    case VK_MENU: 8;'n.SC{  
     MaskBits|=ALTBIT; UA9LI<Y  
     break; K$]QzPXS  
    case VK_CONTROL: zh.c_>jS  
     MaskBits|=CTRLBIT; lET)<V(Y  
     break; P X0#X=$  
    case VK_SHIFT: }dHiW:J>  
     MaskBits|=SHIFTBIT; u#,]>;  
     break; 4bBxZY  
    default: //judge the key and send message :I $2[K  
     break; {S}@P~H =  
   } Yo(B8}?0!  
   for(int index=0;index<MAX_KEY;index++) i\ Vpp8<B  
   { NN:TT\!v  
    if(hCallWnd[index]==NULL) ;MMFF{  
     continue; </=PN1=A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c[y8"M5  
    { =_H39)|T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); { &'TA  
     bProcessed=TRUE; l xfdJNb  
    } :A'!u r=\  
   } <S}qcjG  
  } kW~F*  
  if(!bProcessed){ ry\']\k  
   for(int index=0;index<MAX_KEY;index++){ o{he) r6)_  
    if(hCallWnd[index]==NULL) q"Md)?5N  
     continue; #K l2K4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +o3g]0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8bGq"!w-  
   } 8<kme"% s  
  } '=H^m D+gl  
 } qck/b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +B m+Pj>  
} ) G{v>Z ,  
3XnXQ/({  
BOOL InitHotkey() $"8k|^Z3  
{ TUaK:*x*  
 if(hHook!=NULL){ [:QMnJ  
  nHookCount++; (*RybKoaA  
  return TRUE; zvf]}mNx  
 } ;Wa{q.)  
 else E5(Y*m!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p.9v<I%0  
  if(hHook!=NULL) y]l"u=$Tr{  
   nHookCount++; <J)A_Kx[57  
  return (hHook!=NULL); c-.>C)  
} #H[ 4?4r  
BOOL UnInit() _PM<25Y,@  
{ nnG2z@$-  
 if(nHookCount>1){ a~* V  
  nHookCount--; hwzUCh 5!  
  return TRUE; W/>?1+r.Z  
 } iy]}1((hR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $3TTHS o  
 if(unhooked==TRUE){ !I[n|r"  
  nHookCount=0; 7fay:_  
  hHook=NULL; 32iI :u  
 } JF*g!sV%  
 return unhooked; >, E$bm2  
} V,+[XB  
xp&!Cl>C3\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S=}~I  
{ 9oP{Al  
 BOOL bAdded=FALSE; *d@Hnu"q  
 for(int index=0;index<MAX_KEY;index++){ /[? F1Q  
  if(hCallWnd[index]==0){ ~vGtNMQg  
   hCallWnd[index]=hWnd; `z_7[$\~  
   HotKey[index]=cKey; &HK s >  
   HotKeyMask[index]=cMask; !C#RW=h9  
   bAdded=TRUE; ~ ZL`E  
   KeyCount++; Fnpn_O XlH  
   break; t^,Qy.L0  
  } 358/t/4 {p  
 } Pm^N0L9?q  
 return bAdded; @;fE%N  
} ^\&g^T%  
;a&:r7]=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oKi1=d+T  
{ el?V2v[  
 BOOL bRemoved=FALSE; } +4Bf+u:  
 for(int index=0;index<MAX_KEY;index++){ &a_kJ)J  
  if(hCallWnd[index]==hWnd){ m@.{zW7bO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @$P!#z  
    hCallWnd[index]=NULL; ig}e@]  
    HotKey[index]=0; A+*oT(`  
    HotKeyMask[index]=0; 5%+}rSn7  
    bRemoved=TRUE; 1=Zw=ufqV  
    KeyCount--; \Byk`} 9  
    break; B  bw1k  
   } SECQVA_y`  
  } 5TneuGD  
 } Tud1xq  
 return bRemoved; y,?G75wij  
} J md ?  
`b")Bx|  
void VerifyWindow() b8Rh|"J)d  
{ : W^\ mH  
 for(int i=0;i<MAX_KEY;i++){ J7ekIQgR  
  if(hCallWnd!=NULL){ 5^K#Tj ;2  
   if(!IsWindow(hCallWnd)){ fq'Xy9L  
    hCallWnd=NULL; A dEbyL  
    HotKey=0; @JEmybu  
    HotKeyMask=0; CQHp4_  
    KeyCount--; h ^h-pd  
   } GR ?u?-  
  } ^:!(jiH  
 } ; Uqx&5P}  
} g!p_c  
G;HlII9x[  
BOOL CHookApp::InitInstance() 2c~?UK[1  
{ A>t!/_"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zI&4k..4  
 hins=AfxGetInstanceHandle(); zQ5jx5B":  
 InitHotkey(); O;0<^M/0G  
 return CWinApp::InitInstance(); H='9zqYZ<W  
} GHJ=-9{YL  
< mK  
int CHookApp::ExitInstance() ' ?G[T28  
{ 3y=<w|4F  
 VerifyWindow(); y8hg8J|  
 UnInit(); .x!7  
 return CWinApp::ExitInstance(); StZRc\k  
} X;6r $   
nqxq@.L2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file BgWz<k}5M  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o`K^Wy~+k#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3.<6;?  
#if _MSC_VER > 1000 8<-oJs_o+  
#pragma once (L0 hS'  
#endif // _MSC_VER > 1000 _%Jl&0%q  
UI<PNQvo9  
class CCaptureDlg : public CDialog n E,gQHw  
{ 6Sb'Otw.  
 // Construction Ef`5fgp? S  
 public: sK 1m9  
  BOOL bTray; [B ~zoB(  
  BOOL bRegistered; !UBDx$]^  
  BOOL RegisterHotkey(); c,+(FQ9  
  UCHAR cKey; F%.9f Uo  
  UCHAR cMask; HcBH!0  
  void DeleteIcon(); j,56Lh%1  
  void AddIcon(); Vr-3M+l=O  
  UINT nCount; L`\`NNQC  
  void SaveBmp(); *mQDS.'AB@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor RC8)f8n  
  // Dialog Data ^KZAYB9C  
  //{{AFX_DATA(CCaptureDlg) *)NR$9lGv  
  enum { IDD = IDD_CAPTURE_DIALOG }; B)DC,+@$  
  CComboBox m_Key; Jl> at  
  BOOL m_bControl; D){"fw+b  
  BOOL m_bAlt; 2[LX\  
  BOOL m_bShift; gl9pgY1ni  
  CString m_Path; ,dZ H$  
  CString m_Number; (]}x[F9l  
  //}}AFX_DATA cPx ~|,)l  
  // ClassWizard generated virtual function overrides \ L9?69B~  
  //{{AFX_VIRTUAL(CCaptureDlg) V8nz-DL{  
 public: g^z5fFLg/8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Tw}?(\ya  
 protected: D0#T-B\#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2%5^Fi  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?79SPp)oo  
  //}}AFX_VIRTUAL !qTpQ5Dm  
  // Implementation n~,]KdU]  
 protected: 8sR  
  HICON m_hIcon; UU.mdSL  
  // Generated message map functions  \Z\IK  
  //{{AFX_MSG(CCaptureDlg) npO@Haw  
  virtual BOOL OnInitDialog(); ?v"K1C1.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +(z_"[l"  
  afx_msg void OnPaint(); wsf Hd<Z_  
  afx_msg HCURSOR OnQueryDragIcon(); aT?p>  
  virtual void OnCancel(); y/X:=d6"  
  afx_msg void OnAbout(); -t%{"y  
  afx_msg void OnBrowse(); Iuu<2#gb8"  
  afx_msg void OnChange(); NoJnchiU  
 //}}AFX_MSG &h7smZO5j  
 DECLARE_MESSAGE_MAP() _@#uIOcE  
}; _OJ0 < {E  
#endif '<?v:pb9  
]^*_F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *`+<x  
#include "stdafx.h" ;!l*7}5X=  
#include "Capture.h" $ ] W[y=  
#include "CaptureDlg.h" hF{x')(#l  
#include <windowsx.h> jU]]:S4xD/  
#pragma comment(lib,"hook.lib") `P^u:  
#ifdef _DEBUG &547`*  
#define new DEBUG_NEW BaWQ<T8p8  
#undef THIS_FILE Gg=aK~q6  
static char THIS_FILE[] = __FILE__; ch0oFc$  
#endif aPD?Bh>JU  
#define IDM_SHELL WM_USER+1 $f<eq7rRe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;g: UE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l~]hGLviJE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [Krm .)  
class CAboutDlg : public CDialog t4f (Y,v  
{ zB#_:(1qK  
 public: LyuSZa]  
  CAboutDlg(); MekT?KPQ{L  
  // Dialog Data -TzI>Fz  
  //{{AFX_DATA(CAboutDlg) hsTFAfa'  
  enum { IDD = IDD_ABOUTBOX }; }mKGuCoH>  
  //}}AFX_DATA OwG6i|q  
  // ClassWizard generated virtual function overrides +={  
  //{{AFX_VIRTUAL(CAboutDlg) *F\T}k7  
 protected: mJ0}DJiX$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZR!cQ oV=  
  //}}AFX_VIRTUAL  OLk9A  
  // Implementation l5FuMk-  
 protected: ki;!WhF~  
  //{{AFX_MSG(CAboutDlg) B;xZ% M]  
  //}}AFX_MSG iEiu%T>  
  DECLARE_MESSAGE_MAP() W<\kf4Y  
}; TpJg-F  
Zg)_cRR   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )ZT6:)  
{ =d go!k  
 //{{AFX_DATA_INIT(CAboutDlg) Q^$ghZ6V  
 //}}AFX_DATA_INIT ZhhI@_sz  
} 6uu^A9x  
^y&q5p jj  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;\<""Yj@l  
{ \p5|}<Sr)  
 CDialog::DoDataExchange(pDX); zb"rMzCH  
 //{{AFX_DATA_MAP(CAboutDlg) SQh+5  
 //}}AFX_DATA_MAP :d;[DYFLxb  
} G;2R]H#p  
-Nsk}Rnk*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) siZr@g!L  
 //{{AFX_MSG_MAP(CAboutDlg) KKLR'w,A>  
 // No message handlers ]YCPyc:  
 //}}AFX_MSG_MAP $T"h";M)s  
END_MESSAGE_MAP() _R EqT  
`+roQX.p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) C1h#x'k  
: CDialog(CCaptureDlg::IDD, pParent) }czsa_  
{ A5sf  
 //{{AFX_DATA_INIT(CCaptureDlg) 9wAA. -"  
  m_bControl = FALSE; 9.xvV|Sp  
  m_bAlt = FALSE; Z8&4z.6_  
  m_bShift = FALSE; WHp97S'd  
  m_Path = _T("c:\\"); LMAmpVo  
  m_Number = _T("0 picture captured."); 4F}Pu<;  
  nCount=0; (V$Zc0  
  bRegistered=FALSE; 9 0X?1  
  bTray=FALSE; HwB {8S?sm  
 //}}AFX_DATA_INIT 6tOCZ'f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Dq?E\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fZ[kh{|  
} y&1%1 #8F  
uCw>}3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2$M,*Dnr  
{ 24/ /21m  
 CDialog::DoDataExchange(pDX); XAkK:}h  
 //{{AFX_DATA_MAP(CCaptureDlg) wAw42{M  
  DDX_Control(pDX, IDC_KEY, m_Key); ^uia`sOP4  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a*D,*C5}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); v9u<F6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \,2gTi,=  
  DDX_Text(pDX, IDC_PATH, m_Path); w"{bp  
  DDX_Text(pDX, IDC_NUMBER, m_Number); & B}Lo  
 //}}AFX_DATA_MAP >L^xlm%7o  
} | z:Q(d06  
@!e~G'j%VD  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O]t\B *%}  
//{{AFX_MSG_MAP(CCaptureDlg) %Ys$@dB  
 ON_WM_SYSCOMMAND() `AR"!X  
 ON_WM_PAINT() #>=8w9]  
 ON_WM_QUERYDRAGICON() VKy5=2&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Gu5~ DyT`G  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GMz8B-vk  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PkTf JQP8  
//}}AFX_MSG_MAP [cDbaq,T  
END_MESSAGE_MAP() b\:~;  
ZP-dW|<[ x  
BOOL CCaptureDlg::OnInitDialog() !K[/L< Kv  
{ |8bE9qt.P  
 CDialog::OnInitDialog(); e8oKn&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f e|g3>/|  
 ASSERT(IDM_ABOUTBOX < 0xF000); >:2}V]/ ;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "qawq0P8Z  
 if (pSysMenu != NULL) (VyA6a8  
 { T '.[F  
  CString strAboutMenu; rIVvO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )Ob]T{GY  
  if (!strAboutMenu.IsEmpty()) X'f)7RbT  
  { \b$<J.3  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5X0QxnnV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); wZ jlHe  
  } fp{G|.SA  
 } 8.yCA  
 SetIcon(m_hIcon, TRUE); // Set big icon c_#*mA"+  
 SetIcon(m_hIcon, FALSE); // Set small icon Rv<L#!; t  
 m_Key.SetCurSel(0); JdiP>KXV  
 RegisterHotkey(); ?W!ry7gXO  
 CMenu* pMenu=GetSystemMenu(FALSE); _42Z={pZZq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); F}D3,&9N  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); eRs&iK2y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ox[ .)v  
 return TRUE; // return TRUE unless you set the focus to a control (0OM "`j  
} 3V}(fnv  
$e BQH  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) v5T`K=qC  
{ \,R!S/R#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) MU1E_"Z)  
 { 1[SA15h  
  CAboutDlg dlgAbout; &cc9}V)M  
  dlgAbout.DoModal(); mw4JQ\  
 } -w]/7cH  
 else (~&w-w3  
 { BqB |Fo  
  CDialog::OnSysCommand(nID, lParam); Ns<?b;aK  
 } q jz3<`7-  
} hbI;Hd  
!^iwQ55e2A  
void CCaptureDlg::OnPaint() _{$fA6C  
{ 4&{!M _  
 if (IsIconic()) &s8<6P7  
 { #by Jqy&e  
  CPaintDC dc(this); // device context for painting ?v4E<iXs  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); K(VW%hV1  
  // Center icon in client rectangle d2~l4IL)~  
  int cxIcon = GetSystemMetrics(SM_CXICON); vd (?$  
  int cyIcon = GetSystemMetrics(SM_CYICON); [jrqzB  
  CRect rect; T@P!L  
  GetClientRect(&rect); N*_"8LIfi_  
  int x = (rect.Width() - cxIcon + 1) / 2; >b48>@~bY  
  int y = (rect.Height() - cyIcon + 1) / 2; SE)nD@:  
  // Draw the icon 514Z<omrK  
  dc.DrawIcon(x, y, m_hIcon); mb1Vu  
 } JoJukoy}F  
 else g1{/ 5{XI  
 { ?#BV+#(  
  CDialog::OnPaint(); \|%E%Yc  
 } OCNPi4  
} BvK QlT  
I9 &lO/c0  
HCURSOR CCaptureDlg::OnQueryDragIcon() dJi|D  
{ -Sz_mr  
 return (HCURSOR) m_hIcon; n@ [  
} AnMV <  
dZ]Rqr _!  
void CCaptureDlg::OnCancel() %dW%o{  
{ |4mVT&63(  
 if(bTray) ag 8`O&+  
  DeleteIcon(); {eQWO.C{  
  CDialog::OnCancel(); GeV+/^u  
} .z-UOyer  
UpfZi9v?W  
void CCaptureDlg::OnAbout() g_aCHEFBv  
{ W5SNI>|E  
 CAboutDlg dlg; ,j178EX  
 dlg.DoModal(); 0<.R A%dj  
} "0Q1qZ  
O/b+CSS1  
void CCaptureDlg::OnBrowse() C:i|-te  
{ 7-* =|gl+  
 CString str; V%NeZ1{ e  
 BROWSEINFO bi; K_ke2{4Jm  
 char name[MAX_PATH]; UyiJU~r1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %3o`j<  
 bi.hwndOwner=GetSafeHwnd(); =&vFVIhWcf  
 bi.pszDisplayName=name; Ck'aHe22'  
 bi.lpszTitle="Select folder"; cb$-6ZE/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; vFQ,5n;fF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O0hu qF$K  
 if(idl==NULL) (Rd$VYuf  
  return; x({C(Q'O  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  tR)H~l7q  
 str.ReleaseBuffer(); )D/ 6%]O  
 m_Path=str; +Xy*?5E;C  
 if(str.GetAt(str.GetLength()-1)!='\\') PsnGXcj  
  m_Path+="\\"; ke%pZ 7{u  
 UpdateData(FALSE); 8P2 J2IU  
} )Gk`[*q ;  
s_Wyh !@M  
void CCaptureDlg::SaveBmp() `u XQ z7  
{ Y)|N"f;  
 CDC dc; .`p&ATg v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); fex,z%}p  
 CBitmap bm; ig+4S[L~n  
 int Width=GetSystemMetrics(SM_CXSCREEN); [[+ pMI  
 int Height=GetSystemMetrics(SM_CYSCREEN); +TJ EG?o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); eQDX:b  
 CDC tdc; 3EK9,:<Cf  
 tdc.CreateCompatibleDC(&dc); u2iXJmM*  
 CBitmap*pOld=tdc.SelectObject(&bm); s'\$t  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (gXN%rsY  
 tdc.SelectObject(pOld); Vba.uKNjk  
 BITMAP btm; (zcLx;N  
 bm.GetBitmap(&btm); M(Zc^P}N  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; I#rubAl  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _$s> c!t,#  
 BITMAPINFOHEADER bih; IV`%V+ f  
 bih.biBitCount=btm.bmBitsPixel; D(]E/k@ ;~  
 bih.biClrImportant=0; & ,hr8  
 bih.biClrUsed=0; YY5!_k  
 bih.biCompression=0; A1i!F?X  
 bih.biHeight=btm.bmHeight; DAO]uh{6  
 bih.biPlanes=1; %)(Cp-b!  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3n;K!L%zMT  
 bih.biSizeImage=size; K8I$]M   
 bih.biWidth=btm.bmWidth; v]VWDT `  
 bih.biXPelsPerMeter=0; 1iBP,:>*  
 bih.biYPelsPerMeter=0; jZ*WN|FK?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); s!B/WsK  
 static int filecount=0; ~O6\6$3b5E  
 CString name; nH-V{=**  
 name.Format("pict%04d.bmp",filecount++); $XnPwOj  
 name=m_Path+name; >3.X?  
 BITMAPFILEHEADER bfh; tJ0NPI56yP  
 bfh.bfReserved1=bfh.bfReserved2=0; r 2:2,5_  
 bfh.bfType=((WORD)('M'<< 8)|'B');  jN*:QI  
 bfh.bfSize=54+size; s^8u&y)3  
 bfh.bfOffBits=54; j2 %^qL  
 CFile bf; \cJa;WM>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ PkuTg";  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (5Nv8H8|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `'S0*kMT  
  bf.WriteHuge(lpData,size); 9 ; i\g=  
  bf.Close(); Cb;WZ3HR  
  nCount++; %;xOB^H^  
 } ~@W*r5/  
 GlobalFreePtr(lpData); Kg\R+i@#<  
 if(nCount==1) K }$&:nao  
  m_Number.Format("%d picture captured.",nCount); 0Q5^C!K  
 else !ZXUPH  
  m_Number.Format("%d pictures captured.",nCount); pv)`%<  
  UpdateData(FALSE); #I*QX%(H#  
} ` uCIXb  
/8'S1!zc  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5 `/< v^  
{ rf &M!d}!  
 if(pMsg -> message == WM_KEYDOWN) %3r:s`{  
 { KKe8 ly,  
  if(pMsg -> wParam == VK_ESCAPE) "tk-w{>  
   return TRUE; )?! [}t  
  if(pMsg -> wParam == VK_RETURN) s#9Ui#[=h  
   return TRUE; [{u(C!7L`  
 } ]e?x# <S  
 return CDialog::PreTranslateMessage(pMsg); -V.d?A4"  
} !D^c3d  
f9$xk|2g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +j14Q$  
{  l! bv^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i]{1^pKq  
  SaveBmp(); (5L-G{4  
  return FALSE; kS5_&#  
} :iWS\G^ U  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fh8j2S9J  
 CMenu pop; s"KJiQKGM  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,MPB/j^o5!  
 CMenu*pMenu=pop.GetSubMenu(0); Gbpw5n;e  
 pMenu->SetDefaultItem(ID_EXITICON); rZXrT}Xh{W  
 CPoint pt; 2S[-$9  
 GetCursorPos(&pt); 5Qwh(C^H  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y] oaO+  
 if(id==ID_EXITICON) Io`P,l:  
  DeleteIcon(); qy1F* kY  
 else if(id==ID_EXIT) &<TzG B*  
  OnCancel(); O Wp%v_y]  
 return FALSE; 4bVO9aUG{  
} VSX@e|Nj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); w'4AJ Q|;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n{0Ld - zH  
 AddIcon(); C BYX]  
 return res; PQmq5N6  
} $lA V6I.  
rf:XRJ <4  
void CCaptureDlg::AddIcon() VXBY8;+Yp  
{ 38ES($  
 NOTIFYICONDATA data; eDI= nSo  
 data.cbSize=sizeof(NOTIFYICONDATA); 8LkP)]4^sO  
 CString tip; IA zZ1#/3  
 tip.LoadString(IDS_ICONTIP); W<ZK,kv  
 data.hIcon=GetIcon(0); ^>x|z.  
 data.hWnd=GetSafeHwnd(); qVqRf.-\  
 strcpy(data.szTip,tip); u|#>32kV  
 data.uCallbackMessage=IDM_SHELL; 4LcX<B U9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lA(Q@yEW  
 data.uID=98; /'2O.d0}.  
 Shell_NotifyIcon(NIM_ADD,&data); ) /vhclkb  
 ShowWindow(SW_HIDE); 8F(h*e_?  
 bTray=TRUE; ocbB&  
} uP3_FX: e  
^)!F9h+  
void CCaptureDlg::DeleteIcon() w>fdQ!RdP  
{ /PBaIoJE  
 NOTIFYICONDATA data; eK_*2=;XRW  
 data.cbSize=sizeof(NOTIFYICONDATA); #t8{R~y"gv  
 data.hWnd=GetSafeHwnd(); `N//A}9  
 data.uID=98; 9h90huyKF  
 Shell_NotifyIcon(NIM_DELETE,&data); l ASL8O&\  
 ShowWindow(SW_SHOW); n]_[NR) i  
 SetForegroundWindow(); UV 4>N  
 ShowWindow(SW_SHOWNORMAL); RgdysyB  
 bTray=FALSE;  YpAg  
} :AdDLpk3j  
-~[9U,  
void CCaptureDlg::OnChange() /^{BUo  
{ *_Z#O,  
 RegisterHotkey(); SnlyUP~P  
} Pz#7h*;cw.  
qSqI7ptA\  
BOOL CCaptureDlg::RegisterHotkey() keW~ NM  
{ PP~rn fE  
 UpdateData(); -4rDbDsr  
 UCHAR mask=0; kd:$oS_*s  
 UCHAR key=0; c3*t_!@oC  
 if(m_bControl) SKuIF*"! S  
  mask|=4; )0vU k  
 if(m_bAlt) EFuvp8^y  
  mask|=2; W!blAkM%i  
 if(m_bShift) mME 4 l  
  mask|=1; n~V4nj&_T  
  key=Key_Table[m_Key.GetCurSel()]; B_U{ s\VY  
 if(bRegistered){ .#u_#=g?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,oxcq?7#4  
  bRegistered=FALSE; "vCM}F  
 } s5.AW8X=?*  
 cMask=mask; 5erc D  
 cKey=key; !MDNE*_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (BxJryXm  
 return bRegistered; +MbIB&fRCB  
} 'bGX-C  
> oA? 6x  
  四、小结 &C im!I  
"\Egs)\  
  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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