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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: !U]V?Jpi"  
  \E.t=XBn  
  一、实现方法 ^e8R 43w:!  
{549&]/o  
  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: QN-n9f8  
}Iub{30mp  
#pragma data_seg("shareddata") &+`l $h  
HHOOK hHook =NULL; //钩子句柄 ^g[\.Q  
UINT nHookCount =0; //挂接的程序数目 *NV`6?o@6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <E@ 7CG.=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 UVu"meZX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #2DH_P  
static int KeyCount =0; zx(j6  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~<, \=;b/  
#pragma data_seg() D4'? V Iz  
}p t5.'l  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 fY=iQ?{/[  
joDfvY*[  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Z;S*fS-_  
p{Pa(Z]G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T<54qe4`p  
cKey,UCHAR cMask) -xXNzC   
{ ejo4mQ]a  
 BOOL bAdded=FALSE; ,_rarU)[J  
 for(int index=0;index<MAX_KEY;index++){ jT: :o  
  if(hCallWnd[index]==0){ eiEZtu  
   hCallWnd[index]=hWnd; +7 F7Kh  
   HotKey[index]=cKey; *, *"G?  
   HotKeyMask[index]=cMask; gn%#2:=pVu  
   bAdded=TRUE; `8FC&%X_  
   KeyCount++; GJO/']k  
   break; iZMsN*9[  
  } 1AE/ILGo  
 } C2<y(GU[Bh  
 return bAdded; 5.?O PK6  
} ,;+\!'lS  
//删除热键 mApn(&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "fpj"lf-  
{ 1r~lh#_8  
 BOOL bRemoved=FALSE; (X!/tw,.  
 for(int index=0;index<MAX_KEY;index++){ izFu&syv)  
  if(hCallWnd[index]==hWnd){ M8[YW|VkP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VdeK~#k  
    hCallWnd[index]=NULL; W$'pUhq\H  
    HotKey[index]=0; m6;Xo}^w  
    HotKeyMask[index]=0; K,IOD t  
    bRemoved=TRUE; # Jdip)  
    KeyCount--; J.<eX=<  
    break; {t=Nnc15K  
   } 7Ck;LF}>0  
  } :/~vaCZ  
 } d:pp,N~2o  
 return bRemoved; B4|`Z'U#;  
} y5Pw*?kn  
Ap!UX=HBb  
`|/|ej]$P  
  DLL中的钩子函数如下: !r LHPg  
b8]oI"&G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %x927I>  
{ 8PEOi  
 BOOL bProcessed=FALSE; 6U&Uyd)  
 if(HC_ACTION==nCode) J:(Shd'4D  
 { jSG jv>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z=K5~nU  
   switch(wParam) M:I,j  
   {  LqUvEq  
    case VK_MENU: ~qqtFjlG^  
     MaskBits&=~ALTBIT; `+f\Q2]Z  
     break; 'I<j`)4`d  
    case VK_CONTROL: I"!gzI`Sd  
     MaskBits&=~CTRLBIT; (D l"s`UH~  
     break; D/:)rj14b  
    case VK_SHIFT: UpIf t=@P  
     MaskBits&=~SHIFTBIT; ?+|tPjg $  
     break; h7y*2:l6  
    default: //judge the key and send message =#V11j  
     break; 0sUc6_>e  
   } SW; b E  
   for(int index=0;index<MAX_KEY;index++){ )F$Stg3e  
    if(hCallWnd[index]==NULL) }fCM_w  
     continue; j |i6/Pk9J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ua[\npz5  
    { AO]lXa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E^YbyJ=1  
     bProcessed=TRUE; 9@1W=sl  
    } ' " tieew  
   } M[{Cy[ta  
  } Yq Fzbm{\  
  else if((lParam&0xc000ffff)==1){ //有键按下 b5|p#&YK~  
   switch(wParam) y?JbJ  
   { 9F+bWo_m  
    case VK_MENU: AFFLnLA<L  
     MaskBits|=ALTBIT; TkBBHg;  
     break; [>:gwl _\  
    case VK_CONTROL: L)+ eM&W  
     MaskBits|=CTRLBIT; bVx]r[  
     break; 5QSmim  
    case VK_SHIFT: etoE$2c  
     MaskBits|=SHIFTBIT; L C7LO  
     break; )q^vitkjup  
    default: //judge the key and send message mr1}e VM~!  
     break; (lnQ!4LK  
   } xS}H483h6W  
   for(int index=0;index<MAX_KEY;index++){ AWDjj\Q4  
    if(hCallWnd[index]==NULL) Pc7: hu  
     continue; uJ`&hX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DPwSg\*)  
    { PWMaB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9CNHjs+-}s  
     bProcessed=TRUE; l(5-Cr  
    } `Ek!;u>  
   } ^ ?=K)  
  } 8j'*IRj*q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3+-(;>>\  
   for(int index=0;index<MAX_KEY;index++){ 8w&rj-  
    if(hCallWnd[index]==NULL) *r`Yz}  
     continue; {K:Utdu($q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %wf|nnieZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); iy]}1((hR  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 kYB <FwwB  
   } `0i3"06lr  
  }  YBD{l  
 } F[ EblJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6p " c ^  
} Jg:-TK/  
sZ"U=6R  
  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: XijLS7Aw|  
Q: O>kCDV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pxxFm~"d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~TH5>``;gF  
Qu,k  
  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: z#VpS=  
ik *)j  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wzPw; xuG  
{ U 0RfovJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "Y]ZPFh#.  
 { r^t{Ii ~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b 0b9#9x  
  SaveBmp(); ;q; C ^l  
  return FALSE; ig}e@]  
 } 66<\i ltUQ  
 …… //其它处理及默认处理 r0deBRM  
} [ 5W#1 &  
.w_`d'}  
"O[76}I+.q  
  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。 g>xUS_d>  
+.]}f}Y  
  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。 *+j{9LK  
p@Y$eZ:O  
  二、编程步骤 SMO%sZ]  
8Wx@[!  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ^D;D8A.  
L4pjh&+8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Tn0l|GRuZA  
0BB @E(*  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; D}/=\J/  
"qTC(F9N$.  
  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; DRW.NL o  
Ik5jwfz  
  5、 添加代码,编译运行程序。 V$<G)dwUG5  
iQ!  
三、程序代码 H='9zqYZ<W  
]jVSsSv  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL kE_@5t7O{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) mU+FQX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,AbKxT f2  
#if _MSC_VER > 1000 :uwRuPI  
#pragma once lDJd#U'V  
#endif // _MSC_VER > 1000 V1`5D7Z  
#ifndef __AFXWIN_H__ 2Ph7qEBQ22  
#error include 'stdafx.h' before including this file for PCH HcBH!0  
#endif )YnI !v2T  
#include "resource.h" // main symbols e.}3OK  
class CHookApp : public CWinApp CS;W)F  
{ 3_oD[ ])A  
 public: XW~ BEa  
  CHookApp(); lNaez3  
  // Overrides 64!ame}n+  
  // ClassWizard generated virtual function overrides {FJX  
  //{{AFX_VIRTUAL(CHookApp) }r~v,KDb  
 public: XY!{g(  
  virtual BOOL InitInstance(); c#n4zdQd]5  
  virtual int ExitInstance(); Tw}?(\ya  
  //}}AFX_VIRTUAL @vdc)vN[ /  
  //{{AFX_MSG(CHookApp) ?79SPp)oo  
  // NOTE - the ClassWizard will add and remove member functions here. ^/%o%J&Hz  
  // DO NOT EDIT what you see in these blocks of generated code ! z^P* :  
  //}}AFX_MSG AJ>BF.>  
  DECLARE_MESSAGE_MAP() 5y(t`Fmt  
}; vNC$f(cQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); L,L ~ .E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IYfV~+P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zj9bSDVL(  
BOOL InitHotkey(); BP[CR1Gs  
BOOL UnInit(); C`NBHRa>  
#endif ;/?Z<[B  
N?a1sdR  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QH7V_#6bKP  
#include "stdafx.h" ~{7zm"jN  
#include "hook.h" vz;7} Zj]  
#include <windowsx.h> nc3ltT,R  
#ifdef _DEBUG 79{.O`v  
#define new DEBUG_NEW K-2o9No?j`  
#undef THIS_FILE 1N!Oslum  
static char THIS_FILE[] = __FILE__; )g9)IF  
#endif :(bdI]  
#define MAX_KEY 100 $z2 xZqe  
#define CTRLBIT 0x04 ZL4l (&"  
#define ALTBIT 0x02 %uGleY]~  
#define SHIFTBIT 0x01 'DCKD4@C/  
#pragma data_seg("shareddata") .)i O Du  
HHOOK hHook =NULL; ~rgf{oGz  
UINT nHookCount =0; -Q<z1vz  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $i,6B9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j>$=SMc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yxaT7Oqh%  
static int KeyCount =0; Ne &Xf  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hH <6E  
#pragma data_seg() DC?21[60  
HINSTANCE hins; Rro?q  
void VerifyWindow(); i{TIm}_\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /hm84La  
//{{AFX_MSG_MAP(CHookApp) 5z1\#" B[  
// NOTE - the ClassWizard will add and remove mapping macros here. Mam8\  
// DO NOT EDIT what you see in these blocks of generated code! - *:p.(c  
//}}AFX_MSG_MAP \ V[;t-  
END_MESSAGE_MAP()  EX[B/YH  
a$C2}  
CHookApp::CHookApp() d>lt  
{ Wyy^gJl  
 // TODO: add construction code here, &?SX4c~?u  
 // Place all significant initialization in InitInstance FWuw/b$  
} TRF]i/Bs  
8h*t55  
CHookApp theApp; h7bPAW=(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8<YX7e  
{ j(0Ilx|7v  
 BOOL bProcessed=FALSE; seu ~'s-  
 if(HC_ACTION==nCode) 6D/uo$1Y  
 { ;c1relR2  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7sXy`+TZ->  
   switch(wParam) M0RRmW@f.a  
   { ,%A)"doaG  
    case VK_MENU: 6tOCZ'f  
     MaskBits&=~ALTBIT; r)gCTV(kb  
     break; y&1%1 #8F  
    case VK_CONTROL: Z+NF(d  
     MaskBits&=~CTRLBIT; Dt W*n1Bt  
     break; 9Hu d|n  
    case VK_SHIFT: `q%U{IR  
     MaskBits&=~SHIFTBIT; Tak t_N  
     break; Ks#A<! ;=  
    default: //judge the key and send message cI2Fpf`2Wj  
     break; #S%4?   
   } y>$1 UwQ  
   for(int index=0;index<MAX_KEY;index++){ <x0)7xX  
    if(hCallWnd[index]==NULL) S"zk!2@C  
     continue; :-)GNf yGz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q8;#_HE  
    { q%>7L<r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G%S6$@:  
     bProcessed=TRUE; PkTf JQP8  
    } cg,Ua!c  
   } ZP-dW|<[ x  
  } }g>kpa0c  
  else if((lParam&0xc000ffff)==1){ //Key down 80|onP\L  
   switch(wParam) $ADPV,*gG  
   { P'sfi>A  
    case VK_MENU: T '.[F  
     MaskBits|=ALTBIT; RAV^D.  
     break; kae2 73"  
    case VK_CONTROL: lkb2?2\+  
     MaskBits|=CTRLBIT; wZ jlHe  
     break; z$|;-u|  
    case VK_SHIFT: 4@6 <  
     MaskBits|=SHIFTBIT; }%$OU =T  
     break; Q/py qe G  
    default: //judge the key and send message <#y*h8IZ@t  
     break; :=9<  
   } oSY7IIf%L  
   for(int index=0;index<MAX_KEY;index++) K\(6 rS}N  
   { } Gr&w-v  
    if(hCallWnd[index]==NULL) P`EgA  
     continue; ;'}'5nO=$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H -,TS^W  
    { zT7"VbP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hsz^rZ  
     bProcessed=TRUE; Ns<?b;aK  
    } &RW`W)0;  
   } !^iwQ55e2A  
  } > aG=T{  
  if(!bProcessed){ w{`Acu  
   for(int index=0;index<MAX_KEY;index++){ g*y/j]  
    if(hCallWnd[index]==NULL) 59 <hV?  
     continue; tuLH}tkNY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \GL*0NJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,?(ciO)  
   } Z5B/|{  
  } <bUXC@3W  
 } l^W uS|G[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uv]{1S{tb  
} l5k?De_(x  
=K(JqSw+M  
BOOL InitHotkey() ,h&a9:+i  
{ -Sz_mr  
 if(hHook!=NULL){ aQUGNa0+d  
  nHookCount++; I^_NC&m  
  return TRUE; VEs5;]#<2D  
 } "3}<8 c  
 else g^l RG3a  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); vtyx`F f  
  if(hHook!=NULL) %>zjGF<  
   nHookCount++; wL3,g2-L  
  return (hHook!=NULL); 89H sPB1"t  
} >c~RI7uu  
BOOL UnInit() ?djQZ *  
{ z9DcnAs  
 if(nHookCount>1){ sg AzL  
  nHookCount--; ;:]\KJm}?  
  return TRUE; rs]I  
 } |V|+lx'sc  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~L{l+jK$p  
 if(unhooked==TRUE){ q \O Ou  
  nHookCount=0; (D7$$!}  
  hHook=NULL; vt1lR5  
 } lH2wG2  
 return unhooked; QyGnDomQ  
} )D/ 6%]O  
(9C<K<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ke%pZ 7{u  
{ A.En+-[\  
 BOOL bAdded=FALSE; gl7|H&&xV  
 for(int index=0;index<MAX_KEY;index++){ fU+Pn@'  
  if(hCallWnd[index]==0){ d 6t:hn  
   hCallWnd[index]=hWnd; nwmW.(R4  
   HotKey[index]=cKey; cWLqU  
   HotKeyMask[index]=cMask; ;\{`Ci\  
   bAdded=TRUE; /*rhtrS)  
   KeyCount++; rwf^,r"r  
   break; d~9!,6XM  
  } #FH[hRo=6  
 } dl~|Izm  
 return bAdded; OW@\./nM  
} tTanW2C  
F]+~x/!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \6!W05[ Q  
{ H/fUM  
 BOOL bRemoved=FALSE; z(13~38+  
 for(int index=0;index<MAX_KEY;index++){ s:>\/[*>0c  
  if(hCallWnd[index]==hWnd){ 5h{`<W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ s60 TxB  
    hCallWnd[index]=NULL; BS 1Ap  
    HotKey[index]=0; nH-V{=**  
    HotKeyMask[index]=0; ,,4 GNbBC  
    bRemoved=TRUE; n/4i|-^  
    KeyCount--; 9Ul(GI(  
    break; gl%`qf6:O  
   } ;2xO`[#  
  } N.do "  
 } SU.ythU2,c  
 return bRemoved; gABr@>Vv  
} } ^kL|qmjR  
]d}0l6  
void VerifyWindow() w3T]H_V  
{ Wr?'$:  
 for(int i=0;i<MAX_KEY;i++){ 0Q5^C!K  
  if(hCallWnd!=NULL){ jM)C4ii.-$  
   if(!IsWindow(hCallWnd)){ p *w$:L  
    hCallWnd=NULL; ""iaGH+Cxw  
    HotKey=0; V ~{fB~  
    HotKeyMask=0; cC{"<fYF  
    KeyCount--; gb|Q%LS9R  
   } )?! [}t  
  } "2ru7Y"  
 } $.%rAa_H  
} J9~i%hzr  
l`9t}  
BOOL CHookApp::InitInstance() 4'1m4Ugg  
{ tz NlJ~E  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e.d #wyeX  
 hins=AfxGetInstanceHandle(); xGk6n4Gg  
 InitHotkey(); w*9br SK  
 return CWinApp::InitInstance(); K$ }a8rH  
} "UFs~S|e  
KL,/2 (  
int CHookApp::ExitInstance() hB;VCg8  
{ ^"\s eS  
 VerifyWindow(); 5Z/7kU= I  
 UnInit(); iSLGwTdLn  
 return CWinApp::ExitInstance(); Jb_1LZ) ]  
} C BYX]  
)::>q5c  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E_z;s3AXQ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {PU!=IkTS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B<?[Mrdxw  
#if _MSC_VER > 1000 ~T7B$$  
#pragma once h Ov={:  
#endif // _MSC_VER > 1000 N;oQ^B'  
/&#XhrT  
class CCaptureDlg : public CDialog POI.]1i  
{ e1myH6$W  
 // Construction h5_G4J{1  
 public: *.-.iY.a]  
  BOOL bTray; w>fdQ!RdP  
  BOOL bRegistered; IzOYduJ.  
  BOOL RegisterHotkey(); bu7'oB~:V^  
  UCHAR cKey; Y}*\[}l:&x  
  UCHAR cMask; KOq;jH{$  
  void DeleteIcon(); gF=jf2{YX  
  void AddIcon(); 1LJuCI=~  
  UINT nCount; O%~jop7# 6  
  void SaveBmp(); s&kQlQ=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor W W2Ob*  
  // Dialog Data WL,&-*JAW  
  //{{AFX_DATA(CCaptureDlg) b i y4 d  
  enum { IDD = IDD_CAPTURE_DIALOG }; HW4 .zw  
  CComboBox m_Key; G|w=ez  
  BOOL m_bControl; eivtH P  
  BOOL m_bAlt; `i) 2nNJ"  
  BOOL m_bShift; c3*t_!@oC  
  CString m_Path; B&+`)E{KB  
  CString m_Number; $mmup|;(  
  //}}AFX_DATA mME 4 l  
  // ClassWizard generated virtual function overrides W6T|iZoV"r  
  //{{AFX_VIRTUAL(CCaptureDlg) /){KOCBl;  
 public: {Sl57!U5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <^~FLjsfg  
 protected: <e]Oa$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {qW~"z*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 'bGX-C  
  //}}AFX_VIRTUAL w;}@'GgL  
  // Implementation "Td`AuP@,  
 protected: I$NhXZ)KT  
  HICON m_hIcon; K3uG2g(>2  
  // Generated message map functions IEjP<pLe  
  //{{AFX_MSG(CCaptureDlg) N"/-0(9[  
  virtual BOOL OnInitDialog(); CycUeT  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (Rk_-9_E.  
  afx_msg void OnPaint(); 50TA :7  
  afx_msg HCURSOR OnQueryDragIcon(); L%v^s4@  
  virtual void OnCancel(); BR^7_q4q  
  afx_msg void OnAbout(); gj\)CBOv  
  afx_msg void OnBrowse(); wiaX&-c]8  
  afx_msg void OnChange(); 2)#K+O3c  
 //}}AFX_MSG l$K,#P<)  
 DECLARE_MESSAGE_MAP() xvzr:p P  
}; P o jmC  
#endif e{;OSk`x  
O3N0YGhJ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'Y$R~e^Y?  
#include "stdafx.h" +jg9$e"  
#include "Capture.h" 8ul&x~2;X  
#include "CaptureDlg.h" uj%skOD6Z  
#include <windowsx.h> OA:%lC!  
#pragma comment(lib,"hook.lib") mrm^e9*Z  
#ifdef _DEBUG d!KsNkk  
#define new DEBUG_NEW 22kpl)vbU  
#undef THIS_FILE 7'wS\/e4a  
static char THIS_FILE[] = __FILE__; Cv$ SJc  
#endif 2&+#Vsm`V  
#define IDM_SHELL WM_USER+1 =n^!VXaL]]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _3]][a,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); st"{M\.p  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5L:1A2Z?c  
class CAboutDlg : public CDialog  tvXW  
{ #jAqra._b  
 public: x^"E S%*  
  CAboutDlg(); IHgeQ F ~  
  // Dialog Data K:' q>D@  
  //{{AFX_DATA(CAboutDlg) )CX4kPj  
  enum { IDD = IDD_ABOUTBOX }; t_ksvWUo  
  //}}AFX_DATA O62b+%~F  
  // ClassWizard generated virtual function overrides p8s:g~ W  
  //{{AFX_VIRTUAL(CAboutDlg) X1 ZgSs+i  
 protected: -XRn~=5   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +(uYwdcN  
  //}}AFX_VIRTUAL :'aAZegQY  
  // Implementation Soie^$ Y  
 protected: p3/*fH98  
  //{{AFX_MSG(CAboutDlg) CG'.:` t  
  //}}AFX_MSG H+ h07\? %  
  DECLARE_MESSAGE_MAP() B?$ "\;&  
}; {JV@"t-X3"  
FWH}j0Gj|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) A:<;M@q !  
{ bCZ g cN  
 //{{AFX_DATA_INIT(CAboutDlg) K[chjp!$l  
 //}}AFX_DATA_INIT 1FtM>&%4  
} 56 l@a{  
w&4~Q4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {cpEaOyOM  
{ CF|]e:  
 CDialog::DoDataExchange(pDX); nA?Hxos  
 //{{AFX_DATA_MAP(CAboutDlg) Y!6/[<r$~k  
 //}}AFX_DATA_MAP *5<Sr q'  
} , @m@S ^  
`.y}dh/+0W  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) S osj$9E  
 //{{AFX_MSG_MAP(CAboutDlg) >:=|L%]s;\  
 // No message handlers $8l({:*q0  
 //}}AFX_MSG_MAP "m{,~'x  
END_MESSAGE_MAP() .oEmU+  
Nr2C@FU:0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Gu=STb  
: CDialog(CCaptureDlg::IDD, pParent) Ax oD8|  
{ E1;@=#t2i  
 //{{AFX_DATA_INIT(CCaptureDlg) #S%Q*k<hw  
  m_bControl = FALSE; %AF5=  
  m_bAlt = FALSE; {b]aC  
  m_bShift = FALSE; fAZiC+  
  m_Path = _T("c:\\"); JO14KY*%  
  m_Number = _T("0 picture captured."); |%~+2m  
  nCount=0; 39 {{7(hh  
  bRegistered=FALSE; K.gEj*@  
  bTray=FALSE; T ^A b!O  
 //}}AFX_DATA_INIT .I3?7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c62=*] ,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~f|Z%&l|  
} ?}Z1(it0  
\b[9ebME  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hP J4Oj1O  
{ 0oy-os  
 CDialog::DoDataExchange(pDX); O7']  
 //{{AFX_DATA_MAP(CCaptureDlg) 3p?KU-  
  DDX_Control(pDX, IDC_KEY, m_Key); @1zQce>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~.PP30 '  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dBO@6*N4c  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); m?s}QGSka  
  DDX_Text(pDX, IDC_PATH, m_Path); _DRrznaw  
  DDX_Text(pDX, IDC_NUMBER, m_Number); -{h   
 //}}AFX_DATA_MAP =Cqv=   
} PR<||"03  
-#-p1^v}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) dQy>Nmfy  
//{{AFX_MSG_MAP(CCaptureDlg) (Lh#`L?x  
 ON_WM_SYSCOMMAND() ]IJRnVp%  
 ON_WM_PAINT() - ~O'vLG  
 ON_WM_QUERYDRAGICON() gPS&^EdxA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 59(U`X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9ykM3  
 ON_BN_CLICKED(ID_CHANGE, OnChange) A`O<6   
//}}AFX_MSG_MAP Kex[ >L10G  
END_MESSAGE_MAP() Ju@Q6J5  
89o)M5KQ  
BOOL CCaptureDlg::OnInitDialog() e2CV6F@a  
{ {5c]Mn"r  
 CDialog::OnInitDialog(); SEKN|YQV/t  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ba@ax3  
 ASSERT(IDM_ABOUTBOX < 0xF000); _i}wK?n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]T O/kl/  
 if (pSysMenu != NULL) b|^I<7  
 { K0+ ;b u  
  CString strAboutMenu; D)='8jV7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _17|U K|N  
  if (!strAboutMenu.IsEmpty()) j{#Wn !,  
  { B7Ntk MK  
   pSysMenu->AppendMenu(MF_SEPARATOR); z?8~[h{i%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h -_&MD/J  
  } 9 -h.|T2il  
 } bv?0.{Z  
 SetIcon(m_hIcon, TRUE); // Set big icon 5''*UFIF1  
 SetIcon(m_hIcon, FALSE); // Set small icon +R$?2  
 m_Key.SetCurSel(0); `ZHP1uQ<  
 RegisterHotkey(); g;F"7 ^sg  
 CMenu* pMenu=GetSystemMenu(FALSE); c $;\i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^. X[)U  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); J$uM 03  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a,'Cyv">  
 return TRUE; // return TRUE unless you set the focus to a control RcY[rnI6  
} 7-iIay1h"  
ka7uK][  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2V#6q,2  
{ =7[)'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dK?); *w]  
 { ft5DU/%  
  CAboutDlg dlgAbout; ryD%i"g<  
  dlgAbout.DoModal(); 3VCqp13  
 } oC dGQ7G}  
 else i3V/`)iz  
 { 6o}V@UzqV  
  CDialog::OnSysCommand(nID, lParam); vd~U@-C=R  
 } P;foK)AM  
} ^KHLBSc:  
~@c-*  
void CCaptureDlg::OnPaint() ySX/=T:<;  
{ Y^lQX~I2{  
 if (IsIconic()) wz#[:2  
 { n E :'Zxj  
  CPaintDC dc(this); // device context for painting DnyYMe!r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u*R7zY  
  // Center icon in client rectangle 4 eh=f!(+  
  int cxIcon = GetSystemMetrics(SM_CXICON); ??xlA-E  
  int cyIcon = GetSystemMetrics(SM_CYICON); =:K@zlO:  
  CRect rect; ;w6s<a@Zh  
  GetClientRect(&rect); W7e4pR?w  
  int x = (rect.Width() - cxIcon + 1) / 2; w!,QxrOV~  
  int y = (rect.Height() - cyIcon + 1) / 2; OXtBJYe  
  // Draw the icon mCk5B*Jy  
  dc.DrawIcon(x, y, m_hIcon); _EKF-&Q6  
 } z-Hkz  
 else # cWHDRLX  
 { I)[B9rbe  
  CDialog::OnPaint(); Y^eX@dE FR  
 } Q]i[.ME  
} BR3mAF  
)1z4q`  
HCURSOR CCaptureDlg::OnQueryDragIcon() YRa4W.&Yn  
{ pI^=B-7  
 return (HCURSOR) m_hIcon; 02M7gBS  
} d=n h  
`1,eX)S  
void CCaptureDlg::OnCancel() lZ a?Y@  
{ %F3}/2  
 if(bTray) = o+7xom  
  DeleteIcon(); \]a uSO  
  CDialog::OnCancel(); fk\5D[j^  
} 1Zq   
^Ezcy?  
void CCaptureDlg::OnAbout() Su4h'&xx  
{ /$*; >4=>f  
 CAboutDlg dlg; >Jiij  
 dlg.DoModal(); lxOqs:b  
} ;qG1r@o  
>0M:&NMda  
void CCaptureDlg::OnBrowse() wy\o*P9mG)  
{ C zpsqTQ  
 CString str; }!knU3J  
 BROWSEINFO bi; y3AL)  
 char name[MAX_PATH]; |w,^"j2R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); JchA=n  
 bi.hwndOwner=GetSafeHwnd(); lYdQB[l  
 bi.pszDisplayName=name; 9<~,n1b>x  
 bi.lpszTitle="Select folder"; QS%,7'EG  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; , Z4p0M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $uTlbAuv  
 if(idl==NULL) Lqq*Nr  
  return; X`tOO  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2}>go^#O/w  
 str.ReleaseBuffer(); h bdEw=r?  
 m_Path=str; B ;;cbY  
 if(str.GetAt(str.GetLength()-1)!='\\') YBeZN98Nt  
  m_Path+="\\"; 'bG1U`v=3  
 UpdateData(FALSE); ;7)OSGR  
} "1\(ZKG8^Q  
V9gVn?O0  
void CCaptureDlg::SaveBmp()  ,&4zKm  
{ l`oT:  
 CDC dc; O} (E(v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +-'`Q Ae  
 CBitmap bm; w# xncH:1  
 int Width=GetSystemMetrics(SM_CXSCREEN); =CGD ~p`  
 int Height=GetSystemMetrics(SM_CYSCREEN); rR3m' [  
 bm.CreateCompatibleBitmap(&dc,Width,Height); v5P*<U Ax  
 CDC tdc; ~}Kp  
 tdc.CreateCompatibleDC(&dc); `s#sE.=o  
 CBitmap*pOld=tdc.SelectObject(&bm); _ Eszr(zJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VoWA tNU  
 tdc.SelectObject(pOld); eR(\s_`  
 BITMAP btm; aViJ   
 bm.GetBitmap(&btm); k q/t]%(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;,()wH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \=$EmHF  
 BITMAPINFOHEADER bih; 0@JilGk1u  
 bih.biBitCount=btm.bmBitsPixel; fpI; `s  
 bih.biClrImportant=0; 6sO  
 bih.biClrUsed=0; z%++\.g_  
 bih.biCompression=0; m j'"Z75  
 bih.biHeight=btm.bmHeight; TB ;3`  
 bih.biPlanes=1; 0EcC  
 bih.biSize=sizeof(BITMAPINFOHEADER); ecM4]U  
 bih.biSizeImage=size; myEGibhK  
 bih.biWidth=btm.bmWidth; 8Pl+yiB/o`  
 bih.biXPelsPerMeter=0; `%KpTh  
 bih.biYPelsPerMeter=0; :<'i-Ur8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -G(3Y2  
 static int filecount=0; f)p>nW?Z  
 CString name; @>qx:jx(-S  
 name.Format("pict%04d.bmp",filecount++); x&Q+|b%  
 name=m_Path+name; GlXA-p<  
 BITMAPFILEHEADER bfh; 3ybK6!g`[  
 bfh.bfReserved1=bfh.bfReserved2=0; JUe K"|fA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 94Kuy@0:+  
 bfh.bfSize=54+size; /k4^&  
 bfh.bfOffBits=54; $.suu^>^w  
 CFile bf; (M+,wW[6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HPu/. oE  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); CVyx lc>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qcR|E`k-G  
  bf.WriteHuge(lpData,size); c4!c_a2pS  
  bf.Close(); tdMP,0u  
  nCount++; Ba"^K d`  
 } 1NE!=;VOl  
 GlobalFreePtr(lpData); _WRR 3  
 if(nCount==1) j]@ x Q,y  
  m_Number.Format("%d picture captured.",nCount); kR`6s  
 else ! 0>!tW  
  m_Number.Format("%d pictures captured.",nCount); X~IRpzC  
  UpdateData(FALSE); Ak %no3:9  
} twYB=68  
tu?Z@W/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "/ a*[_sV  
{ Lic{'w&  
 if(pMsg -> message == WM_KEYDOWN) XudH  
 { C{d 8~6  
  if(pMsg -> wParam == VK_ESCAPE) MHpL$g=5_  
   return TRUE; rE bx%u7Q  
  if(pMsg -> wParam == VK_RETURN) h=i A;B^>  
   return TRUE; ~I/>i&|M1  
 } Y1yvI  
 return CDialog::PreTranslateMessage(pMsg); z1{E:~f  
} Hm.&f2|(  
WcZo+r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9" }^SI8  
{ -6em*$k^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _4XoUE\\  
  SaveBmp(); 4cErk)F4  
  return FALSE; ?C#F?N0  
} %(dV|,|v  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pZ@W6}  
 CMenu pop; YP .%CD(K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :Z*02JwK  
 CMenu*pMenu=pop.GetSubMenu(0); :) Fp B"  
 pMenu->SetDefaultItem(ID_EXITICON); @=MZ6q  
 CPoint pt; 'EH  
 GetCursorPos(&pt); N#-kk3!Z;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sa0^1$(<  
 if(id==ID_EXITICON) [# tT o;q  
  DeleteIcon(); _>_y@-b  
 else if(id==ID_EXIT) *+,Lc1|\  
  OnCancel(); 'wT./&Z  
 return FALSE; )z4kP09  
} hNR >Hy\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n/-p;#R  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <5!RAdaj+  
 AddIcon(); 1TD&&EC  
 return res; L F-+5`  
} 8G[Y9A(bmP  
p Yi=q  
void CCaptureDlg::AddIcon() G(Idiw#WT  
{ (Aov}I+  
 NOTIFYICONDATA data; Y(G*Yi?;  
 data.cbSize=sizeof(NOTIFYICONDATA); ;hfG$ {l;  
 CString tip; fB @pwmu  
 tip.LoadString(IDS_ICONTIP); I}g|n0o  
 data.hIcon=GetIcon(0); )8N)Z~h  
 data.hWnd=GetSafeHwnd(); aD2CDu  
 strcpy(data.szTip,tip); 6!}m$Dvt~  
 data.uCallbackMessage=IDM_SHELL; ]TTJrC:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WE Svkm;  
 data.uID=98; y 4,T  
 Shell_NotifyIcon(NIM_ADD,&data); ;uWI l  
 ShowWindow(SW_HIDE); o y%g{,V  
 bTray=TRUE; ;ZqD60%\  
} FDGKMGZ  
aY1#K6(y  
void CCaptureDlg::DeleteIcon() EBn:[2  
{ "*>QxA%c4  
 NOTIFYICONDATA data; raI~BIfe  
 data.cbSize=sizeof(NOTIFYICONDATA); <&m  
 data.hWnd=GetSafeHwnd(); +[l{C+p  
 data.uID=98; PRf\6   
 Shell_NotifyIcon(NIM_DELETE,&data); {*]= qSz  
 ShowWindow(SW_SHOW); 7[?}kG   
 SetForegroundWindow(); #<V'gE  
 ShowWindow(SW_SHOWNORMAL); %$-3fj7  
 bTray=FALSE; 5>k~yaju/  
} @m d^mss  
lV*&^Q8.  
void CCaptureDlg::OnChange() W;x LuKIG  
{ { dx yBDK  
 RegisterHotkey(); Y?SJQhN6W  
} Ita!07  
L$07u{Q  
BOOL CCaptureDlg::RegisterHotkey() XXdMppoR  
{ Tf]VcEF  
 UpdateData(); ]$k m  
 UCHAR mask=0; gYIYA"xN`  
 UCHAR key=0;  k`zK  
 if(m_bControl) ;."{0gq  
  mask|=4; 4'eVFu+62  
 if(m_bAlt) j3'/jk]\  
  mask|=2; K?<Odw'k  
 if(m_bShift) H_$f v_  
  mask|=1; WQ`P^5e  
  key=Key_Table[m_Key.GetCurSel()]; *>H'@gS  
 if(bRegistered){ .TU15AAc  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F>{uB!!L4  
  bRegistered=FALSE; 6E%k{ r  
 } e/~<\  
 cMask=mask; ep1Ajz.l  
 cKey=key; R1%T>2"~&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lt2& uYgp  
 return bRegistered; z>#$#:Z4  
} *VAi!3Rx;  
d`*vJ#$> 2  
  四、小结 KUV{]?'  
J\},o|WI  
  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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