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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: dLbSvK<(I  
  V*gh"gZ<  
  一、实现方法 PVaqKCj:6W  
5S 4 Bz  
  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: pEq }b+-  
4u= v  
#pragma data_seg("shareddata") 2= zw !  
HHOOK hHook =NULL; //钩子句柄 ,t +sw4  
UINT nHookCount =0; //挂接的程序数目 ,}/6Za  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Gz:ell$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Slv91c&md,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ]([^(&2  
static int KeyCount =0; c0Yc~&RF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \: Q)X$6  
#pragma data_seg() )Wy:I_F351  
ttA'RJ  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 &AnWMFo  
tE<'*o'  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'fPDODE  
u]Z;Q_=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^{a_:r"  
cKey,UCHAR cMask) zs.@=Z"  
{ d}<-G.&_  
 BOOL bAdded=FALSE; `r]C%Y4?  
 for(int index=0;index<MAX_KEY;index++){ =Q#d0Q  
  if(hCallWnd[index]==0){ 2H/{OQ$  
   hCallWnd[index]=hWnd; mo"1|Q&  
   HotKey[index]=cKey; elz0t<V  
   HotKeyMask[index]=cMask; ,</Kn~b  
   bAdded=TRUE; &l0 ,q=T  
   KeyCount++; 3z% W5[E)  
   break; `(M0I!t  
  } 0i(c XB  
 } Sq]QRI/  
 return bAdded; -tA_"q'^  
} YySo%\d  
//删除热键 *uoO#4g~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "KgNMNep  
{ *p0Kw>  
 BOOL bRemoved=FALSE; Sym}#F\s  
 for(int index=0;index<MAX_KEY;index++){ ]]P@*4!  
  if(hCallWnd[index]==hWnd){ Id=V\'$o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0ax ;Q[z2  
    hCallWnd[index]=NULL; Nx"|10gC  
    HotKey[index]=0; M9Xq0BBu  
    HotKeyMask[index]=0; + />f?+  
    bRemoved=TRUE; \. a7F4h  
    KeyCount--; $f=6>Kn|^]  
    break; sGx3O i   
   } 5 zz">-Q !  
  } >qZl s'  
 } o,RiAtdk  
 return bRemoved; P=.~LZZ]89  
} 9.BgsV .  
R>B6@|}?  
g3f; JB   
  DLL中的钩子函数如下: QUDpAW  
NAOCQDk{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MlR ]+]  
{ -vv_6Z L[  
 BOOL bProcessed=FALSE; W;?e@}  
 if(HC_ACTION==nCode) 9"zp>VR  
 { *U- :2uf  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T+oOlug  
   switch(wParam) @VQ<X4 Za  
   {  0 \V)DV.i  
    case VK_MENU: e,MgR\F}  
     MaskBits&=~ALTBIT; tX6_n%/L  
     break; qWJHb Dd  
    case VK_CONTROL: V''fmWo7  
     MaskBits&=~CTRLBIT; / ;+Mz*  
     break;  U4qk<!  
    case VK_SHIFT: R_b4S%jhx  
     MaskBits&=~SHIFTBIT; b! r%4Ah  
     break; qkqtPbQ 7  
    default: //judge the key and send message [Sj"gLj  
     break; A4(k<<xjE  
   } w c  
   for(int index=0;index<MAX_KEY;index++){ b,X+*hRt  
    if(hCallWnd[index]==NULL) "]|7%]  
     continue; 7A h   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p`EgMzVO,  
    { xQl}~G]!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bo\~PV[  
     bProcessed=TRUE; 8tVSai8[  
    } }rUAYr~VZ  
   } iH~A7e62OZ  
  } KTBtLUH]*F  
  else if((lParam&0xc000ffff)==1){ //有键按下 }I1j#d0.  
   switch(wParam) (\o4 c0UzK  
   { =R"LB}>h}  
    case VK_MENU: _l+C0lQl=  
     MaskBits|=ALTBIT; tEt46]{  
     break; w O Ou/Y  
    case VK_CONTROL: P-<1vfThH  
     MaskBits|=CTRLBIT;  n (|rs  
     break; :^U>n{   
    case VK_SHIFT: y06xl:iQwF  
     MaskBits|=SHIFTBIT; @v3)N[|d  
     break; z$L e,+  
    default: //judge the key and send message qHT73_R  
     break; }=Xlac_U  
   } )5n:UD{f[#  
   for(int index=0;index<MAX_KEY;index++){ !2>@:CKX  
    if(hCallWnd[index]==NULL) B&_Z&H=  
     continue; I0qJr2[X~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [$td:N *  
    { jo3(\Bq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0+u >"7T  
     bProcessed=TRUE; 3V7WIj<  
    } R+_!FnOJ  
   } pjl>ZoOM  
  } e7bMK<:r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #c":y5:  
   for(int index=0;index<MAX_KEY;index++){ v+}${h9  
    if(hCallWnd[index]==NULL) :LlZ#V2  
     continue; 9C=*>I27?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) IZ\fvYp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); / DP0K @%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8_ o~0lb  
   } gf?N(,  
  } i=1crJ:  
 } i+pQ 7wx  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c&,q`_t  
} 29CzG0?B  
A\W) uwyN  
  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: z 2jC48~  
Ftd,dqd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7WUv  O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nA{yH}D4  
C|2|OTtQ  
  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: &,=FPlTC=  
QPh3(K1w^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UvM4-M%2JN  
{ C/H;|3.X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) bwcr/J( Nb  
 { LAY:R{vI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _*n `*"  
  SaveBmp(); fms(_Q:R?  
  return FALSE; cA|vH^:  
 } yimK"4!j5A  
 …… //其它处理及默认处理 e /1x/v'  
} =FI[/"476  
bC~I}^i\  
l5~O}`gfh  
  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。 ml Cg&fnDB  
~MXhp5PI   
  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。 bo(w$& VW  
MJrPI a[pN  
  二、编程步骤 U^BM5b  
O1)\!=& .  
  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"; T ,jb%uPcE  
rZcSG(d`53  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; KV$4}{  
FvG?%IFM  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 3"< 0_3?W  
"^!y>]j#A  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 6y1\ar(A  
yTh%[k  
  5、 添加代码,编译运行程序。 (x?Tjyzw  
"a}fwg9Y  
三、程序代码 z6rT<~xZtu  
)7[#Ti  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL u"m(a:jQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^Il*`&+?P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ rf%VSxD9  
#if _MSC_VER > 1000 p\F%Nj,  
#pragma once -ucgET`  
#endif // _MSC_VER > 1000 8D,*_p  
#ifndef __AFXWIN_H__ s;=C&N5g  
#error include 'stdafx.h' before including this file for PCH -u4")V>  
#endif +4 Pes  
#include "resource.h" // main symbols {7c'%e  
class CHookApp : public CWinApp #^Pab^Y3r-  
{ #p55/54ZI  
 public: iU37LODa2T  
  CHookApp(); yjMN>L'  
  // Overrides deVnAu =  
  // ClassWizard generated virtual function overrides kd\Hj~*  
  //{{AFX_VIRTUAL(CHookApp) l'aCpzf  
 public: ;^0rY)&  
  virtual BOOL InitInstance(); 4#7*B yvf  
  virtual int ExitInstance(); QIlZZ  
  //}}AFX_VIRTUAL "}`)s_rt  
  //{{AFX_MSG(CHookApp) S4[ #[w`=  
  // NOTE - the ClassWizard will add and remove member functions here. EwU)(UK  
  // DO NOT EDIT what you see in these blocks of generated code ! k.K#i /t  
  //}}AFX_MSG ;b~\ [  
  DECLARE_MESSAGE_MAP() % @+j@i`&  
}; QIevps*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 'L-DMNxBr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N$IA~)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *B}O  
BOOL InitHotkey(); 3 V>$H\H  
BOOL UnInit(); e0(aRN{W  
#endif Cl9nmyf   
3Jlap=]68S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4oueLT(zc  
#include "stdafx.h" 6hv.;n};  
#include "hook.h" Bt(<Xj D  
#include <windowsx.h> h9CTcWGt  
#ifdef _DEBUG $7c,<=  
#define new DEBUG_NEW 3\Q9>>  
#undef THIS_FILE ZV+tHgzlv5  
static char THIS_FILE[] = __FILE__; :v;U7  
#endif ~IjID  
#define MAX_KEY 100 dpsc gW{M  
#define CTRLBIT 0x04 )7NI5x^$  
#define ALTBIT 0x02 dXQC}JA  
#define SHIFTBIT 0x01 F.5fasdX'  
#pragma data_seg("shareddata") #Xox2{~  
HHOOK hHook =NULL; FE&:?  
UINT nHookCount =0; \yFUQq:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey wW1\{<hgr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4C%pKV  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >h#w~@e::  
static int KeyCount =0; Es)|#0m\x@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3^~J;U!3  
#pragma data_seg() \#t)B J2  
HINSTANCE hins; X(MS!RV  
void VerifyWindow(); :op_J!;  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ],S {?!'1  
//{{AFX_MSG_MAP(CHookApp) F]?] |nZZ  
// NOTE - the ClassWizard will add and remove mapping macros here.  =g M@[2  
// DO NOT EDIT what you see in these blocks of generated code! BLO ]78  
//}}AFX_MSG_MAP ?z&%VU"  
END_MESSAGE_MAP() lV %1I@[M  
_W_< bI34  
CHookApp::CHookApp() SeDk/}/~e  
{ Cp"7R&s  
 // TODO: add construction code here, z|D*ymz*EY  
 // Place all significant initialization in InitInstance OM&GypP6&  
} 4}v|^_x-i  
;-kDJ i  
CHookApp theApp; \rzMgR$/rj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uHSnZ"#  
{ qx[c0X!  
 BOOL bProcessed=FALSE; #o4tG  
 if(HC_ACTION==nCode) -dBWpT  
 { ]kTxVe  
  if((lParam&0xc0000000)==0xc0000000){// Key up U|%}B(  
   switch(wParam) +jwHYfAK)  
   { `w\P- q  
    case VK_MENU: VDbbA\  
     MaskBits&=~ALTBIT; jJNCNH*0  
     break; y"q>}5  
    case VK_CONTROL: y7fy9jQ 8.  
     MaskBits&=~CTRLBIT; yvoz 3_!  
     break; 7\,9Gcv1  
    case VK_SHIFT: bC1G5`v_D  
     MaskBits&=~SHIFTBIT; iI";m0Ny  
     break; Gw$5<%sB  
    default: //judge the key and send message ~<n.5q%Z  
     break; #Ir?v  
   } 0O>ClE~P  
   for(int index=0;index<MAX_KEY;index++){ R8Vf6]s_  
    if(hCallWnd[index]==NULL) Q'jw=w!|g  
     continue; ikV;]ox  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ={zTQ+7S`  
    { 3EICdC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uI/ wR!  
     bProcessed=TRUE; G#GZt\)F  
    } %NxQb'  
   } SI+Uq(k  
  } KRC"3Qt  
  else if((lParam&0xc000ffff)==1){ //Key down znwKwc8,  
   switch(wParam) Nb`qM]&  
   { -m%`Di!E  
    case VK_MENU: ` z0q:ME  
     MaskBits|=ALTBIT; c:Nm!+5_(  
     break; 8$ u"92  
    case VK_CONTROL: ' 1gfXC  
     MaskBits|=CTRLBIT; N8dxgh!,  
     break; R/ZScOW[  
    case VK_SHIFT: Pp tuXq%U  
     MaskBits|=SHIFTBIT; P$#:$U @  
     break; 6D`n^uoP  
    default: //judge the key and send message ~E7IU<B  
     break; =,#--1R7g  
   } d/&> `[i  
   for(int index=0;index<MAX_KEY;index++) UgC65O2  
   { \}?X5X>  
    if(hCallWnd[index]==NULL) $0E+8xE  
     continue; 8'8`xu$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bHe' U>  
    { nm,LKS7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #Or;"}P>fB  
     bProcessed=TRUE; o6k#neB>=.  
    } V^5d5Ao  
   } Km8aHc]O~  
  } Ptv'.<-  
  if(!bProcessed){ T+F]hv'  
   for(int index=0;index<MAX_KEY;index++){ 0\ = du  
    if(hCallWnd[index]==NULL) TB! I  
     continue; -$Hu $Y}>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7t:RQ`$:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yQD>7%x  
   } _xp8*2~-  
  } Mz(Vf1pi%  
 } ?1SsF>|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +y?Ilkk;j  
} Z,.Hz\y1D  
Yg^ &4ZF  
BOOL InitHotkey() Y#ZgrziYM  
{ xf]K  
 if(hHook!=NULL){ ]$@D=g,r  
  nHookCount++; ;mG*Rad  
  return TRUE; `.W2t5 Y  
 } `x`[hJ?i  
 else + O.-o/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2M-[x"\1/  
  if(hHook!=NULL) >5t%_/yeB  
   nHookCount++; 64zOEjra  
  return (hHook!=NULL); q*l4h u%3  
} tg/UtE`V  
BOOL UnInit() ZNX38<3h  
{ l4oyF|oJTH  
 if(nHookCount>1){ |1~n<=`Z  
  nHookCount--; 'p&,'+x  
  return TRUE; qUkM No3  
 } 6:7[>|okQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ;=ddv@  
 if(unhooked==TRUE){ ,_Z(!| rW  
  nHookCount=0; /uwi$~Ed  
  hHook=NULL; _qxI9Q}<"  
 } J~k9jeq9  
 return unhooked; 5 8bW  
} v 3I^81  
,yYcjs!=o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4N,mcV  
{ y>P+"Z.K%}  
 BOOL bAdded=FALSE; $oK&k}Q  
 for(int index=0;index<MAX_KEY;index++){ *|fF;-#v  
  if(hCallWnd[index]==0){ !qt2,V  
   hCallWnd[index]=hWnd; Pb#M7=J/  
   HotKey[index]=cKey; mH'~pR>t  
   HotKeyMask[index]=cMask; KUAzJ[>  
   bAdded=TRUE; U#` e~d t<  
   KeyCount++; hy5[ L`B  
   break; 5I622d  
  } @%]A,\  
 } 4I$Y(E}  
 return bAdded; AI-*5[w#A  
} 2*|T)OA`m,  
k {*QU(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +WH\,E  
{ &]nx^C8V;  
 BOOL bRemoved=FALSE; %;,fI'M  
 for(int index=0;index<MAX_KEY;index++){ ci~#G[_$S  
  if(hCallWnd[index]==hWnd){ z%82Vt!a5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7z b^Z]  
    hCallWnd[index]=NULL; b dgkA  
    HotKey[index]=0; H@Z_P p?  
    HotKeyMask[index]=0; ;)(g$r^_i  
    bRemoved=TRUE; D@O `"2  
    KeyCount--; 4ba*Nc*Yc  
    break; cMw<3u\  
   } 6>a6;[  
  } m9 h '!X<  
 } > N~8#C  
 return bRemoved; f!9i6  
} 4<y   
8QrpNSj4  
void VerifyWindow() j[G`p^ul  
{ }aZuCe_  
 for(int i=0;i<MAX_KEY;i++){ k?+ 7%A]  
  if(hCallWnd!=NULL){ l|P"^;*zq  
   if(!IsWindow(hCallWnd)){ Yj/afn(Jt  
    hCallWnd=NULL; 'NEl`v*<P  
    HotKey=0; u^" I3u8$  
    HotKeyMask=0; \Z[1m[{  
    KeyCount--; d1<";b2Jt^  
   } -50DGA,K6  
  } ;CYoc4e  
 } <^5!]8*O  
} 2{-29bq  
bdg6B7%Q  
BOOL CHookApp::InitInstance() ^#9385  
{ X0lPRk53(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); u_(~zs.N]  
 hins=AfxGetInstanceHandle(); ;tjOEmIiU  
 InitHotkey(); "o5]:]h)  
 return CWinApp::InitInstance(); [jMN*p?  
} cb}"giXQTB  
(Xd8'-G$m  
int CHookApp::ExitInstance() ujU,O%.n  
{ Fc~G*Gz~Z|  
 VerifyWindow(); _f1o!4ocx  
 UnInit(); Ar`+x5  
 return CWinApp::ExitInstance(); De?VZ2o9"  
} ON :t"z5  
`Ij@;=(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^q:-ZgM>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y6` xb`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1EyN |m|  
#if _MSC_VER > 1000 k# [!; <  
#pragma once m2(>KMbi  
#endif // _MSC_VER > 1000 S,#1^S  
OW7  
class CCaptureDlg : public CDialog  YKyno?m  
{ ;J%:DD  
 // Construction o`bch? ]  
 public: F-_u/C]  
  BOOL bTray; d>QFmsh-  
  BOOL bRegistered; HBlk~eZ  
  BOOL RegisterHotkey(); ^P) f]GQx  
  UCHAR cKey; D|- ]<r1"  
  UCHAR cMask; L5&M@YTH  
  void DeleteIcon(); 1- 2hh)  
  void AddIcon(); n(: <pz  
  UINT nCount; Q+:y  
  void SaveBmp(); ] ; w 2YR  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P`Np +E#I  
  // Dialog Data %Bs. XW,  
  //{{AFX_DATA(CCaptureDlg) hlzB cz*  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]3KeAJ  
  CComboBox m_Key; }A)\bffH  
  BOOL m_bControl; spEdq}  
  BOOL m_bAlt; e;]tO-Nu  
  BOOL m_bShift; =rjU=3!&(  
  CString m_Path; "#Rh\DQ  
  CString m_Number; %w;qu1j  
  //}}AFX_DATA &V].,12x  
  // ClassWizard generated virtual function overrides yW_yHSx;  
  //{{AFX_VIRTUAL(CCaptureDlg) 0=Z[6Q@:  
 public: c+Q'4E0 |  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n;g'?z=hy  
 protected: 5ZCu6 A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CIudtY(:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); NR4+&d  
  //}}AFX_VIRTUAL 8wU$kK  
  // Implementation p.DQ|?  
 protected: >)>f~>  
  HICON m_hIcon; ?uWUs )9  
  // Generated message map functions ,81%8r  
  //{{AFX_MSG(CCaptureDlg)  vy<W4  
  virtual BOOL OnInitDialog(); +|A`~\@N  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C:QB=?%;  
  afx_msg void OnPaint(); OVg&?fiP  
  afx_msg HCURSOR OnQueryDragIcon(); ;%tFi  
  virtual void OnCancel(); odv2(\  
  afx_msg void OnAbout(); S 'a- E![  
  afx_msg void OnBrowse(); kDmm  
  afx_msg void OnChange(); R9XU7_3B  
 //}}AFX_MSG t{md&k4  
 DECLARE_MESSAGE_MAP() Kk3+ ]W<  
}; }EK{UM9y  
#endif <,i4Ua  
5'2kP{;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file RSX27fb4  
#include "stdafx.h" 9YzV48su#  
#include "Capture.h" #;[G>-tC  
#include "CaptureDlg.h" [vg&E )V  
#include <windowsx.h> oC0ndp~+&  
#pragma comment(lib,"hook.lib") TnrBHaxbo4  
#ifdef _DEBUG ;mQj2Bwr  
#define new DEBUG_NEW #]` uH{  
#undef THIS_FILE fBSa8D3}`  
static char THIS_FILE[] = __FILE__;  a"Qf  
#endif 4~fYG|a  
#define IDM_SHELL WM_USER+1 NL2 1se  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %M6 OLq!K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4G&`&fff]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 01cBAu   
class CAboutDlg : public CDialog Q\Ek U.[I  
{ /%@;t@BK4  
 public: >eJ <-3L;  
  CAboutDlg(); 1J?v\S$ma`  
  // Dialog Data RGW@@  
  //{{AFX_DATA(CAboutDlg) 'I[?R&j$G  
  enum { IDD = IDD_ABOUTBOX }; fz'qB-F Y  
  //}}AFX_DATA vDjH $ U  
  // ClassWizard generated virtual function overrides 2 bc&sU)X  
  //{{AFX_VIRTUAL(CAboutDlg) hU?DLl:bXF  
 protected: I8xdE(o8+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ( t&RFzE?G  
  //}}AFX_VIRTUAL K_i|cYGV  
  // Implementation a5*r1,  
 protected: AuNUW0/ 7  
  //{{AFX_MSG(CAboutDlg) 4f LRl-)  
  //}}AFX_MSG \xYVnjG,  
  DECLARE_MESSAGE_MAP() hD6BP  
}; d NACE*g;q  
lF}[ YL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nY'V,v[F  
{ @16GF!.  
 //{{AFX_DATA_INIT(CAboutDlg) rN0<y4)!  
 //}}AFX_DATA_INIT sJ6.3= c  
} F8pA)!AH  
=uP? ?E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ( bwD:G9  
{ )+ .=z  
 CDialog::DoDataExchange(pDX); yRXML\Ge  
 //{{AFX_DATA_MAP(CAboutDlg) X%Ok ">  
 //}}AFX_DATA_MAP Be6Yh~m  
} R1];P*>%gZ  
BT7{]2?&V  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gInh+XZs  
 //{{AFX_MSG_MAP(CAboutDlg) * EWWN?d  
 // No message handlers "\|P6H  
 //}}AFX_MSG_MAP JP#S/kJ%3  
END_MESSAGE_MAP() 6tKrR{3#A  
QLqtE;;)JK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?=1eHnP!R  
: CDialog(CCaptureDlg::IDD, pParent) qb>ULP0  
{ r:*G{m-  
 //{{AFX_DATA_INIT(CCaptureDlg) zxR]+9Zh  
  m_bControl = FALSE; j=r1JV @  
  m_bAlt = FALSE; IeYYG^V<A  
  m_bShift = FALSE; g~hMOI?KK^  
  m_Path = _T("c:\\"); omE- c  
  m_Number = _T("0 picture captured."); ,s8/6n#  
  nCount=0; nI:M!j5s`  
  bRegistered=FALSE; !"^Zr]Qt+\  
  bTray=FALSE; /,\V}`Lx"  
 //}}AFX_DATA_INIT -^_2{i  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /7}pReUj  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fyQOF ItM  
} (b25g!  
sN41Bz$q.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y4-kuMYR  
{ .}==p&(  
 CDialog::DoDataExchange(pDX); f-%M~:  
 //{{AFX_DATA_MAP(CCaptureDlg) QjTSbHtH  
  DDX_Control(pDX, IDC_KEY, m_Key); /U;j-m&   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {JE [  
  DDX_Check(pDX, IDC_ALT, m_bAlt); IkCuw./  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "6B@V=d  
  DDX_Text(pDX, IDC_PATH, m_Path); %8*:VR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); PaCC UF  
 //}}AFX_DATA_MAP BA@E  
} 56;u 7  
"&6vFmr  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^/C\:hw  
//{{AFX_MSG_MAP(CCaptureDlg) }3 xkA  
 ON_WM_SYSCOMMAND() h/EIFve  
 ON_WM_PAINT() X1#Ar)  
 ON_WM_QUERYDRAGICON() s~M$Wo8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8~Cmn%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) VYG@_fd!x  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <6UXk[y  
//}}AFX_MSG_MAP PUR,r%K`  
END_MESSAGE_MAP() 63l3WvoK  
NLy4Z:&{  
BOOL CCaptureDlg::OnInitDialog() }UPC~kC+Z  
{ t^01@ejM+  
 CDialog::OnInitDialog(); 3](hMk,}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /.]u%;%r[  
 ASSERT(IDM_ABOUTBOX < 0xF000);  2%@tnk|@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &5W;E+Pub  
 if (pSysMenu != NULL) T}fo  
 { &gCGc?/R#  
  CString strAboutMenu; y3~`qq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Q(& @ra!{  
  if (!strAboutMenu.IsEmpty()) Ark]>4x>  
  { qPDNDkjDD  
   pSysMenu->AppendMenu(MF_SEPARATOR); Xb"i/gfxt  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eoiz]L  
  } 5,Fq:j)MxW  
 } aC1z.?!U  
 SetIcon(m_hIcon, TRUE); // Set big icon (L(7)WbH  
 SetIcon(m_hIcon, FALSE); // Set small icon OxHcoNrz  
 m_Key.SetCurSel(0); nM[yBA  
 RegisterHotkey(); I=!kPuw  
 CMenu* pMenu=GetSystemMenu(FALSE); NBk0P*SI  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?I+{S  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hF'VqJS  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); u@Hz7Q} P  
 return TRUE; // return TRUE unless you set the focus to a control 5} %R  
} 5zK,(cF0-  
)LGVR 3#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) . 1kB8&}  
{ OBWb0t5H?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) D!.c??   
 { Y(UK:LZ'  
  CAboutDlg dlgAbout; ,`f]mv l  
  dlgAbout.DoModal(); in>+D|q c  
 } v0 C+DKi  
 else |]G%b[  
 { <|r|s  
  CDialog::OnSysCommand(nID, lParam);  }u8(7  
 } uWJJ\  
} u8c@q'_  
Sr \y1nt  
void CCaptureDlg::OnPaint() ;"M6}5dQ4  
{ 2"D4q(@  
 if (IsIconic()) k A3K   
 { t oGiG|L  
  CPaintDC dc(this); // device context for painting iq' PeVo  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?^U?ua6  
  // Center icon in client rectangle jSjC43lh  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0/v]YK.  
  int cyIcon = GetSystemMetrics(SM_CYICON); Z5t^D|  
  CRect rect; _y4O2n[e  
  GetClientRect(&rect); F0!Z1S0g  
  int x = (rect.Width() - cxIcon + 1) / 2; 9"#C%~=+  
  int y = (rect.Height() - cyIcon + 1) / 2; v~ >Bbe  
  // Draw the icon ,:mL\ZED  
  dc.DrawIcon(x, y, m_hIcon); `,}7LfY  
 } ^BA I/WP  
 else A:m+v{*`4  
 {  qNJc*@s  
  CDialog::OnPaint(); Ph yIea  
 } V 1'otQH2l  
} N**)8(  
`df!-\#  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3CD#OCz7&  
{ yeiIP  
 return (HCURSOR) m_hIcon; Erw1y,mF  
} sFM$O232  
&|x7T<,)  
void CCaptureDlg::OnCancel() \Y!#Y#c  
{ cF 5|Pf  
 if(bTray) |$\K/]q -  
  DeleteIcon(); 1["i,8zB  
  CDialog::OnCancel(); w=#'8ZuU  
} \-yI dKj  
].s;Yxz  
void CCaptureDlg::OnAbout() >B6* `3v  
{ vv.E6D^x(  
 CAboutDlg dlg; =mXC,<]  
 dlg.DoModal(); Z[Tou  
} u\Cf@}5(  
M{ncWq*_j  
void CCaptureDlg::OnBrowse() <&m50pq  
{ jfG of*  
 CString str; {wC*61@1  
 BROWSEINFO bi; G4'Ia$  
 char name[MAX_PATH]; pa46,q&M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ah*{NR)  
 bi.hwndOwner=GetSafeHwnd(); {dZ]+2Z~+  
 bi.pszDisplayName=name; +(2$YJ35  
 bi.lpszTitle="Select folder"; 'i%r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; OjhX:{"59  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t+a.,$U  
 if(idl==NULL) ^i|R6oO_5  
  return; MsXw 8D  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nYSe0w  
 str.ReleaseBuffer(); :.5l  
 m_Path=str; ) (YNNu  
 if(str.GetAt(str.GetLength()-1)!='\\') kqCsEtm]  
  m_Path+="\\"; A'#d:lOA  
 UpdateData(FALSE); -gvfz&Lz  
} ?# w} S%  
v \i"-KH  
void CCaptureDlg::SaveBmp() OTF/Pu$  
{ LWCFCkx%  
 CDC dc; IW~wO  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); HThZ4Kg+  
 CBitmap bm; w W\[#Ku  
 int Width=GetSystemMetrics(SM_CXSCREEN); Zp)=l Td  
 int Height=GetSystemMetrics(SM_CYSCREEN); $w*L' <  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4|K\pCw  
 CDC tdc; O &<p 8  
 tdc.CreateCompatibleDC(&dc); ]L~NYe9  
 CBitmap*pOld=tdc.SelectObject(&bm); {_N9<i{T  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wPM&N@Pf  
 tdc.SelectObject(pOld); s)- ;74(  
 BITMAP btm; wj6u,+  
 bm.GetBitmap(&btm); Hk*1Wrs*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bY#BK_8 :  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Dy.i^`7\  
 BITMAPINFOHEADER bih; N" L&Z4Z  
 bih.biBitCount=btm.bmBitsPixel; ?=9'?K/~a  
 bih.biClrImportant=0; 4`i8m  
 bih.biClrUsed=0; )I&.6l!#  
 bih.biCompression=0; ~)f^y!PMQ  
 bih.biHeight=btm.bmHeight; +vy fhw4  
 bih.biPlanes=1; FGi7KV=N  
 bih.biSize=sizeof(BITMAPINFOHEADER); U5kKT.M  
 bih.biSizeImage=size; ['o ueOg  
 bih.biWidth=btm.bmWidth; 94-BcN  
 bih.biXPelsPerMeter=0; l L;5*@  
 bih.biYPelsPerMeter=0; Nbr$G=U  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4fs d5#  
 static int filecount=0; 'yPKQ/y$x  
 CString name; l(NQk> w  
 name.Format("pict%04d.bmp",filecount++); hY.i`sp*/  
 name=m_Path+name; 3q'AgiW  
 BITMAPFILEHEADER bfh; d~~kJKK  
 bfh.bfReserved1=bfh.bfReserved2=0; e4` L8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 3A`Gx#  
 bfh.bfSize=54+size; YTyrX  
 bfh.bfOffBits=54; At\(/Z y  
 CFile bf; 1<G+KC[F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ x.-d)]a!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?Ujg.xo\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RKP, w %  
  bf.WriteHuge(lpData,size); jae9!W i  
  bf.Close(); /-p!|T}w  
  nCount++; K#+?oFo:  
 } MoFM'a9  
 GlobalFreePtr(lpData); aB6xRn9  
 if(nCount==1) Y]SF0:v!n  
  m_Number.Format("%d picture captured.",nCount); o*H U^  
 else >>J3"XHX  
  m_Number.Format("%d pictures captured.",nCount); 5(H%Ia  
  UpdateData(FALSE); sA,bR|  
} bvtpqI QZ  
_H]^7`;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lBbb7*Ljt<  
{ P)K $+oo  
 if(pMsg -> message == WM_KEYDOWN) ]QaKXg)3q  
 { dO8 2T3T  
  if(pMsg -> wParam == VK_ESCAPE) LJ[zF~4#  
   return TRUE; B)Y[~4o  
  if(pMsg -> wParam == VK_RETURN) MOD&3>NI  
   return TRUE; l?*DGW(t{  
 } %(6IaqJ[  
 return CDialog::PreTranslateMessage(pMsg); 2'@m'4-N  
} 96^aI1:  
lndz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6&x\!+]F8  
{ '<o3x$6 *  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4SI~y;c)  
  SaveBmp(); W,@ F!8  
  return FALSE; V#oz~GMB  
} x{:U$[_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wGti |7Tu*  
 CMenu pop; vntJe^IaFd  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AU\=n,K7  
 CMenu*pMenu=pop.GetSubMenu(0); *Y(59J2  
 pMenu->SetDefaultItem(ID_EXITICON); b11I$b #  
 CPoint pt; K[y")ooE<j  
 GetCursorPos(&pt); }i!+d,|f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .rK0C)  
 if(id==ID_EXITICON) geR :FO;\  
  DeleteIcon(); yq-~5ui  
 else if(id==ID_EXIT) E /H%q|q  
  OnCancel(); K}CgFBk  
 return FALSE; ? uYO]!VC  
} ;NA5G:eQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `9r{z;UQ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )5b_>Uy  
 AddIcon(); \( s `=(t  
 return res; FFqK tj's  
} kD#n/R Bgf  
W+i^tmj  
void CCaptureDlg::AddIcon() c6[m'cy  
{ >B{qPrmI  
 NOTIFYICONDATA data; ]pvHsiI:  
 data.cbSize=sizeof(NOTIFYICONDATA); MZz9R*_VS  
 CString tip; Rmw=~NP5  
 tip.LoadString(IDS_ICONTIP); ]Uwp\2Bc  
 data.hIcon=GetIcon(0); "IU}>y>J  
 data.hWnd=GetSafeHwnd(); {P6Bfh7CZ  
 strcpy(data.szTip,tip); :Tpf8  
 data.uCallbackMessage=IDM_SHELL; z[f]mU  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *W8n8qG%T  
 data.uID=98; #1%@R<`  
 Shell_NotifyIcon(NIM_ADD,&data); X]y8-}Qf  
 ShowWindow(SW_HIDE); 7 {92_xRL  
 bTray=TRUE; Z)|~  
} aLg,-@  
4C`RxQJM  
void CCaptureDlg::DeleteIcon() "zq'nV=  
{ )3CM9P'0  
 NOTIFYICONDATA data; b;VIR,2  
 data.cbSize=sizeof(NOTIFYICONDATA); ''9]`B,:a0  
 data.hWnd=GetSafeHwnd(); G %sO{k7  
 data.uID=98; 6vK`J"d{~D  
 Shell_NotifyIcon(NIM_DELETE,&data); =CFjG)L  
 ShowWindow(SW_SHOW); O H>.N"IG  
 SetForegroundWindow(); 7SHllZ  
 ShowWindow(SW_SHOWNORMAL); 0G8@UJv6  
 bTray=FALSE; J6CSu7Voa  
} _5Lcr)  
|6Y:W$7k  
void CCaptureDlg::OnChange() 8~(,qU8-N  
{ \r IOnZ.WK  
 RegisterHotkey(); Hpix:To  
} +1wEoU.l2  
0cG[<\qT  
BOOL CCaptureDlg::RegisterHotkey() +~V_^-JG&  
{ ]izHn;+  
 UpdateData(); ) r.Wge  
 UCHAR mask=0; Y)k"KRW+  
 UCHAR key=0; Ze%S<xT!O  
 if(m_bControl) K ar!  
  mask|=4; 9C \}bT  
 if(m_bAlt) ;cVK2'  
  mask|=2; igQzL*X  
 if(m_bShift) j(y<oxh  
  mask|=1; dlo`](5m  
  key=Key_Table[m_Key.GetCurSel()]; +(DzE H |  
 if(bRegistered){ ,u|>%@h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); V<WWtu;3  
  bRegistered=FALSE; p|gVIsg[-e  
 } C1{Q 4(K%  
 cMask=mask; "S#$:92  
 cKey=key; [,U l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K-]) RIM  
 return bRegistered; WblH}  
} QyA^9@iVs  
Ia%cc L=  
  四、小结 e5AsX.kv B  
0dwD ?GG2  
  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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