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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: o)n8,k&nm  
  hXS'*vO"  
  一、实现方法 Q3%a=ba)h  
DMcvu*A  
  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: M4M 4*o  
.}ZX~k&P  
#pragma data_seg("shareddata") ` 2|~Z H  
HHOOK hHook =NULL; //钩子句柄 Ndi'b_Sh\  
UINT nHookCount =0; //挂接的程序数目 F~a5yW:R=)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &.kg8|s{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .5L/<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 23+6u{   
static int KeyCount =0; P?n!fA>!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 e^~t52]  
#pragma data_seg() < Q\`2{  
 g/+M&k$  
  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。 sLbz@54  
)2YU|  
  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: *-+~H1tP  
1sc #!^Oo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR HT?`PG  
cKey,UCHAR cMask) 2!68W X  
{ &[cL%pP  
 BOOL bAdded=FALSE; JPQ02&e  
 for(int index=0;index<MAX_KEY;index++){ \<lV),  
  if(hCallWnd[index]==0){ "G6d'xkP  
   hCallWnd[index]=hWnd; 3{MIBMA  
   HotKey[index]=cKey; .e.vh:Sz  
   HotKeyMask[index]=cMask; R~RY:[5?w  
   bAdded=TRUE; ~w]1QHA'f  
   KeyCount++; 5 @[%P=  
   break; =Bo0Oei  
  } @D"|Jq=6P  
 } S"3g 1yU^_  
 return bAdded; P#ru-0DD  
} G#@<bg3  
//删除热键 I}:>M!w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3;:xEPb._6  
{ ui 2RTAb  
 BOOL bRemoved=FALSE; <Isr  
 for(int index=0;index<MAX_KEY;index++){ eHnC^W}|s  
  if(hCallWnd[index]==hWnd){ 8#Z$}?W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &OzJ^G\o  
    hCallWnd[index]=NULL; |um)vlN;9  
    HotKey[index]=0; Jb tbW &EH  
    HotKeyMask[index]=0; *;gi52tM  
    bRemoved=TRUE;  &R^mpV5  
    KeyCount--; Y(A?ib~K  
    break; sJM}p5V  
   } fZ %ZV  
  } YYM  
 } 'M'LJ.,"/  
 return bRemoved; A,=l9hE'  
} +M.|D,wg2  
0?`#ko7~d  
HE,wEKp  
  DLL中的钩子函数如下: u8,T>VNVw  
]g)%yuox9F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \@F{Q-  
{  /KV@Ce\  
 BOOL bProcessed=FALSE; zO\"$8q*  
 if(HC_ACTION==nCode) :iWV:0)P  
 { ;;`KkNys m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qzmZ/z96  
   switch(wParam) }`g*pp*  
   {  ^IId =V=2  
    case VK_MENU: mcR!P~"i  
     MaskBits&=~ALTBIT; p_nrua?  
     break; [a Z)*L ;  
    case VK_CONTROL: D2mB4  
     MaskBits&=~CTRLBIT; M<L<mP}  
     break; So 5{E 4[  
    case VK_SHIFT: tw(2V$J  
     MaskBits&=~SHIFTBIT; *>#cs#)  
     break; 97 g-*K  
    default: //judge the key and send message G?g7G,|d  
     break; x~z 2l#ow  
   } 8]L.E  
   for(int index=0;index<MAX_KEY;index++){ Eg:p_F*lr  
    if(hCallWnd[index]==NULL) x?F{=\z/o  
     continue; ;|%r!!#-t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pJ(l=a  
    { FSB$D)4z>b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); oF^BJ8%Lm  
     bProcessed=TRUE; PLyu1{1" z  
    } lyPXlt  
   } utE:HD.PN  
  } [4t KJ+v  
  else if((lParam&0xc000ffff)==1){ //有键按下 #(H_w4  
   switch(wParam) 5a&w M  
   { }X?*o `sW  
    case VK_MENU: E6gEP0b  
     MaskBits|=ALTBIT; ww2Qa-K  
     break; +g[B &A!d+  
    case VK_CONTROL: S#9SAX [  
     MaskBits|=CTRLBIT; C"{on%  
     break; LA+MX 0*  
    case VK_SHIFT: ["M >  
     MaskBits|=SHIFTBIT; 75HL  
     break; 8iNAs#s  
    default: //judge the key and send message z,)sS<t(  
     break; 6~S0t1/t?  
   } c v 9 6F  
   for(int index=0;index<MAX_KEY;index++){ fz3*oJ'  
    if(hCallWnd[index]==NULL) o0L#39`' g  
     continue; jh G7sS|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dWy1=UQfP  
    { Anv8)J!9u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d@tr]v5 B  
     bProcessed=TRUE; H~i],WD  
    } G,-OH-M!  
   } JWL J<z  
  } "~<~b2Y"5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zIFL?8!H9{  
   for(int index=0;index<MAX_KEY;index++){ %b;+/s2W  
    if(hCallWnd[index]==NULL) J"rwWIxO*  
     continue; \T9UbkR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hH}/v0_jb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0)5Sx /5'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Xb* _LZAU  
   } )uvFta<(  
  } zDyeAxh4  
 } e0HP~&BRs  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )`mF.87b&h  
} .~L4#V{c~  
rVy\,#|  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: H$amt^|zQ4  
:QV6 z*#zD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~^~RltY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [V, ;X  
T zYgH  
  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: @^cgq3H'  
$S8bp3)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) So%1RY{ )  
{ %@93^q[\2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I%>]!X  
 { 8;\tP29  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 up3<=u{>  
  SaveBmp(); 8/?uU]#Q  
  return FALSE; t0H=NUP8  
 } ?>jArzI  
 …… //其它处理及默认处理 jQeE07g  
} n3g WM C  
zRoEx1  
Bj($_2M%+  
  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。 (Zn3-t*  
:$Q]U2$mPS  
  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。  Ox*T:5  
Qn)[1v  
  二、编程步骤 %802H%+  
:G=1$gb  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; X:-bAu}D  
MY*>)us\  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K<  
'`~(Fkj  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; \v P2B  
_E<O+leWf  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; (VI* c!N  
[(P[qEY  
  5、 添加代码,编译运行程序。 f+aS2k(e>  
,iv%^C",)  
三、程序代码 IfmIX+t?  
M|E2&ht  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL q,,>:]f#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Iam-'S5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Y=Ar3O*F  
#if _MSC_VER > 1000 GE8D3V;*V  
#pragma once Or#+E2%1E  
#endif // _MSC_VER > 1000 %=mwOoMk0L  
#ifndef __AFXWIN_H__ xBE RCO^  
#error include 'stdafx.h' before including this file for PCH 8&A|)ur4  
#endif =.f +}y  
#include "resource.h" // main symbols 5) n:<U*  
class CHookApp : public CWinApp -2jBs-z  
{ v!{'23`87  
 public: !%RJC,X  
  CHookApp(); ?(NT!es  
  // Overrides mA] 84zO  
  // ClassWizard generated virtual function overrides ?ZuD _L-i  
  //{{AFX_VIRTUAL(CHookApp) 6(q`Oj  
 public: : ` 6$/DK  
  virtual BOOL InitInstance(); ug6f   
  virtual int ExitInstance(); G_,t\  
  //}}AFX_VIRTUAL mp+\!  
  //{{AFX_MSG(CHookApp) 6aF'^6+a  
  // NOTE - the ClassWizard will add and remove member functions here. 1nlE3Y?AV  
  // DO NOT EDIT what you see in these blocks of generated code ! 1l|A[ G  
  //}}AFX_MSG }2BH_  2  
  DECLARE_MESSAGE_MAP() K@j^gF/0B  
}; leb^,1/D6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  IB.'4B7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jY#(A23  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |!xfIR>=F  
BOOL InitHotkey(); &t*8oNwSs  
BOOL UnInit(); {7Gx9(  
#endif 8F`BJ6='  
#EQx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :9x084ESR)  
#include "stdafx.h" ;oY(I7  
#include "hook.h" 5;K-,"UQ  
#include <windowsx.h> ~g K-5}%!  
#ifdef _DEBUG cpF1XpvT  
#define new DEBUG_NEW 5}d/8tS  
#undef THIS_FILE K5)yM @cq  
static char THIS_FILE[] = __FILE__; =UB*xm%!  
#endif ]4 K1%ZV  
#define MAX_KEY 100 "3Xv%U9@  
#define CTRLBIT 0x04 0x>/6 <<  
#define ALTBIT 0x02 ,. 6J6{  
#define SHIFTBIT 0x01 $xUzFLh=`  
#pragma data_seg("shareddata") e$ XY\{  
HHOOK hHook =NULL;  zU4V^N'  
UINT nHookCount =0; { /F rs*AF  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m<FWv2)^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 56bud3CVs  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l?o-!M{  
static int KeyCount =0; #LN5&i;s  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift x!"SD3r=4>  
#pragma data_seg() !y qa?\v9  
HINSTANCE hins; [w&#+h-q  
void VerifyWindow(); l\T!)Ql  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) _4.]A 3;}  
//{{AFX_MSG_MAP(CHookApp) ( K6~Tj  
// NOTE - the ClassWizard will add and remove mapping macros here. kvW|=  
// DO NOT EDIT what you see in these blocks of generated code! {uaZ<4N.  
//}}AFX_MSG_MAP [5? 4c'Ev  
END_MESSAGE_MAP() S' (cqO}=F  
Ci7P%]9  
CHookApp::CHookApp() M#\  <  
{ #gW /qJ  
 // TODO: add construction code here, :jt;EzCLg%  
 // Place all significant initialization in InitInstance A9\]3 LY  
} y*VQ]aJ  
,hpH!J'5f/  
CHookApp theApp; heE}_,$|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) > 63)z I  
{ lZ|L2Yg3uB  
 BOOL bProcessed=FALSE; K3vseor  
 if(HC_ACTION==nCode) prNhn:j  
 { :]P~.PD5,  
  if((lParam&0xc0000000)==0xc0000000){// Key up <Rcu%&;i  
   switch(wParam) (C8 U   
   { 7d&DrI@~  
    case VK_MENU: _j:UGMTi(U  
     MaskBits&=~ALTBIT; NFk}3w:  
     break; Nls83 W  
    case VK_CONTROL: "+=Pp  
     MaskBits&=~CTRLBIT; BdN8 ^W  
     break; A /q2g7My  
    case VK_SHIFT: D Irgq|8  
     MaskBits&=~SHIFTBIT; e^j<jV`1  
     break; I Byf_E;r  
    default: //judge the key and send message ?Bo?JMV  
     break; 9n1ZVP.ag  
   } ldA!ou7  
   for(int index=0;index<MAX_KEY;index++){ ;{|X,;s  
    if(hCallWnd[index]==NULL) z{ptm7  
     continue; ^>C 11v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rwiw Rh  
    { HF"Eys  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9B /s  
     bProcessed=TRUE; 8z Y)J#  
    } 93j{.0]X  
   } JIzY,%`\  
  } +a%xyD:.?  
  else if((lParam&0xc000ffff)==1){ //Key down 3gAR4  
   switch(wParam) xq}-m!nX  
   { \[yr=X  
    case VK_MENU: j&5G\6:  
     MaskBits|=ALTBIT; iOXZ ]Xj5  
     break; i[\w%(83Fi  
    case VK_CONTROL: r'/\HWNP  
     MaskBits|=CTRLBIT; Hkdf$$\  
     break; B`fH^N  
    case VK_SHIFT: 2 nv[1@M  
     MaskBits|=SHIFTBIT; x?#I4RJH;  
     break; U&X2cR &a  
    default: //judge the key and send message YutQ]zYA.  
     break; @5xu>gKn  
   } (Yv{{mIy  
   for(int index=0;index<MAX_KEY;index++) B MM--y@  
   { T-'~?[v  
    if(hCallWnd[index]==NULL) ow$q7uf  
     continue; kY"KD22a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v5_7r%Hiw  
    { >!L&>OOx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); XVt/qb%)r  
     bProcessed=TRUE; 8-m 3e  
    } K/txD20 O|  
   } ~2@Lx3t$  
  } (9 sIA*,}  
  if(!bProcessed){ wJe?t$ac?  
   for(int index=0;index<MAX_KEY;index++){ %%%S"$t  
    if(hCallWnd[index]==NULL) {T=52h=e  
     continue; fiVHRSX60  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jfD1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]dSK wxk  
   } qTT,U9]:  
  } (luKn&826  
 } S,''>`w  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d H? ScXM=  
} * RWm47  
a8pY[)^c  
BOOL InitHotkey() y7: tr  
{ {hQ6K)s  
 if(hHook!=NULL){ PFM' & ;V  
  nHookCount++; 6BocGo({  
  return TRUE; TW7:q83{l  
 } pu+ur=5&  
 else d;7 uFh|o  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bl;zR  
  if(hHook!=NULL) n((vY.NDV  
   nHookCount++; \L # INP4~  
  return (hHook!=NULL); A(8n  
} c)}2K0  
BOOL UnInit() w8Vw1wW  
{ !2tW$BP^  
 if(nHookCount>1){ sbj";h=E  
  nHookCount--; kM/Te{<  
  return TRUE; +*}{`L- :  
 } HN6}R|IH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6/Fzco#N  
 if(unhooked==TRUE){ ;`dh fcU  
  nHookCount=0; QAPu<rdJP  
  hHook=NULL; ~rD={&0  
 } ememce,Np  
 return unhooked; e>}}:Ud  
} V\]" }V)"  
ORN6vX(1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4|?{VQ  
{ I$t3qd{H&  
 BOOL bAdded=FALSE; CZ<~3bEF  
 for(int index=0;index<MAX_KEY;index++){ d[D&J  
  if(hCallWnd[index]==0){ nH|,T%  
   hCallWnd[index]=hWnd; l_rn++  
   HotKey[index]=cKey; %dST6$Z  
   HotKeyMask[index]=cMask; !7bw5H  
   bAdded=TRUE; Lw1EWN6}_&  
   KeyCount++; fvq,,@23  
   break; |RkcDrB~  
  } H( jXI  
 } N2'qpxOLI  
 return bAdded; &MZ$j46  
} H9)m^ *  
~[WF_NU1y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l_'[27  
{ +  @9.$6N  
 BOOL bRemoved=FALSE; D]a:@x`+Bz  
 for(int index=0;index<MAX_KEY;index++){ $?G"GQ!.  
  if(hCallWnd[index]==hWnd){ f/,>%j=Ms  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "@A![iP  
    hCallWnd[index]=NULL; TL$EV>Nr  
    HotKey[index]=0; kd`0E-QU  
    HotKeyMask[index]=0; K;hh&sTB  
    bRemoved=TRUE; 2aw&YZ&Xo  
    KeyCount--; '^BV_QQ  
    break; g]c[O*NTL  
   } 1OLqL  
  } u]NZ`t%AP  
 } 7|\@zQ h   
 return bRemoved; 3f " %G\  
} uwf 5!Z:>  
XqRJr%JH  
void VerifyWindow() D4eTTfQ  
{ &cWjE x  
 for(int i=0;i<MAX_KEY;i++){ !Cgx.   
  if(hCallWnd!=NULL){ -K,-h[ o  
   if(!IsWindow(hCallWnd)){ CQ`=V2:"ON  
    hCallWnd=NULL; )VL96did  
    HotKey=0; >Rvx[`|O!m  
    HotKeyMask=0; ;6@r-r  
    KeyCount--; ~DRmON5 M  
   } ES~^M840f  
  } alh >"9~!  
 } t }IkK=f  
} g%F"l2M  
l`kWz5[~  
BOOL CHookApp::InitInstance() >hBxY]< \  
{ L9pvG(R%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); M8H5K  
 hins=AfxGetInstanceHandle(); |KB0P@=a  
 InitHotkey(); `%+ mO88o  
 return CWinApp::InitInstance(); D7Y)?Z5A;  
} @(P=Eh  
M"%Q&o/I  
int CHookApp::ExitInstance() hcVJBK  
{ m}>F<;hQ  
 VerifyWindow(); UAR5^  
 UnInit(); ThPE 0V  
 return CWinApp::ExitInstance(); ,-x!$VqS  
} zF5uN:-s  
1ygpp0IGJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *[=bR>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8|E'>+ D_-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qV5DW0.  
#if _MSC_VER > 1000 E\gim<]  
#pragma once 7'NwJ,$6\  
#endif // _MSC_VER > 1000 GGhM;%H_99  
 L4uFNM]  
class CCaptureDlg : public CDialog cyxuK*x<  
{ XZw6Xtn  
 // Construction x `V;Y]7'  
 public: JG{j)O|L  
  BOOL bTray; (KvROV);  
  BOOL bRegistered; -,K!  
  BOOL RegisterHotkey(); 8kP3+  
  UCHAR cKey; ?\8?%Qk  
  UCHAR cMask; 6_N(;6kx(  
  void DeleteIcon(); /?'; nGq  
  void AddIcon(); ; S xFp  
  UINT nCount; Mi~(aah  
  void SaveBmp(); xkOpa,=FI  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !mXxAo  
  // Dialog Data r! Ay :r  
  //{{AFX_DATA(CCaptureDlg) \.mI  
  enum { IDD = IDD_CAPTURE_DIALOG }; W2uOR{ '?  
  CComboBox m_Key; g/13~UM\  
  BOOL m_bControl; dg4vc][  
  BOOL m_bAlt; $ cj>2.   
  BOOL m_bShift; Z,iHy3`  
  CString m_Path; tpuYiL  
  CString m_Number; t43)F9!  
  //}}AFX_DATA |p$spQ  
  // ClassWizard generated virtual function overrides Q]p(u\*  
  //{{AFX_VIRTUAL(CCaptureDlg) 2Pc%fuC  
 public: :x_'i_w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); kA7mLrON  
 protected: Z4IgBn(Z_}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NWxUn.Gy9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [5Lz/ix=  
  //}}AFX_VIRTUAL }B~If}7  
  // Implementation KD^N)&k^Kp  
 protected: RoAlf+&Qb  
  HICON m_hIcon; )& u5IA(  
  // Generated message map functions :T9< d er,  
  //{{AFX_MSG(CCaptureDlg) P'Q+GRpSw  
  virtual BOOL OnInitDialog(); 'w1YFdW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qY[xpm  
  afx_msg void OnPaint(); %\i9p]=  
  afx_msg HCURSOR OnQueryDragIcon(); "--t e  
  virtual void OnCancel(); +Jr|z\  
  afx_msg void OnAbout(); d:yqj:  
  afx_msg void OnBrowse(); N]RZbzK_5G  
  afx_msg void OnChange(); T9s2bC.z55  
 //}}AFX_MSG 8mQmi`  
 DECLARE_MESSAGE_MAP() ;t+ub8  
}; t]X w{)T  
#endif f|sFlUu&  
>$2V%};  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]n-:Yv5 W  
#include "stdafx.h" _SA5e3#  
#include "Capture.h" E }ZJ)V7  
#include "CaptureDlg.h" ":_vK}5  
#include <windowsx.h> tr7<]Hm:  
#pragma comment(lib,"hook.lib") >a}f{\Q  
#ifdef _DEBUG Bm]8m=p  
#define new DEBUG_NEW &d|r~NhP  
#undef THIS_FILE ~}<DG1!  
static char THIS_FILE[] = __FILE__; 8.[SU  
#endif ?@V[#.  
#define IDM_SHELL WM_USER+1 K#"O a h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x.q+uU$^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L5,NP5RC  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; HbW0wuI  
class CAboutDlg : public CDialog w}=5ElB  
{ ` Jdb;  
 public: y '!m4-  
  CAboutDlg(); p/h Rk<K6  
  // Dialog Data YY!Rz[/  
  //{{AFX_DATA(CAboutDlg) @9"J|}  
  enum { IDD = IDD_ABOUTBOX }; p|]\P%,\  
  //}}AFX_DATA KVJ_E!i  
  // ClassWizard generated virtual function overrides =W'Ae,&  
  //{{AFX_VIRTUAL(CAboutDlg) C 9t4#"  
 protected: k1!@^A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?Ec7" hK  
  //}}AFX_VIRTUAL R2 V4#  
  // Implementation Ih"XV  
 protected: $ , u+4h  
  //{{AFX_MSG(CAboutDlg) /gG"v5]  
  //}}AFX_MSG dN$Tf  
  DECLARE_MESSAGE_MAP() '  <=+;q  
}; 9th,VnD0  
qo|WXwP2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) b1( $R[  
{ *I0T{~  
 //{{AFX_DATA_INIT(CAboutDlg) p}~qf  
 //}}AFX_DATA_INIT mrjswF27$o  
} q*>&^V$M  
O`<KwUx !  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N}t 2Nu-  
{ {Ja!~N;3  
 CDialog::DoDataExchange(pDX);  v%iflCK  
 //{{AFX_DATA_MAP(CAboutDlg) :n-]>Q>5=k  
 //}}AFX_DATA_MAP H7DJ~z~J  
} MpR2]k#n<  
sc,vj'r  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2_Z ? #Y  
 //{{AFX_MSG_MAP(CAboutDlg) 5f 5f0|ok  
 // No message handlers ilqy /fL#  
 //}}AFX_MSG_MAP Ptdpj)oi&Q  
END_MESSAGE_MAP() &eX!#nQ_.  
Sxh]R+Xb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mmk=97  
: CDialog(CCaptureDlg::IDD, pParent) fd.^h*'mU  
{   #^A*  
 //{{AFX_DATA_INIT(CCaptureDlg) (O(}p~s  
  m_bControl = FALSE; Jh!I:;/  
  m_bAlt = FALSE; }WH&iES@P  
  m_bShift = FALSE; JAem0jPC8  
  m_Path = _T("c:\\"); ,1+y/{S  
  m_Number = _T("0 picture captured."); rr02pM0  
  nCount=0; |}di&y@-JI  
  bRegistered=FALSE; z)r =+ -  
  bTray=FALSE; >E{";C)  
 //}}AFX_DATA_INIT >]vlkA(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4p,EBn9(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~yW4)4k;b  
} Oagsoik  
DrY:9[LP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  :7]Sa`  
{ Ay0U=#XP  
 CDialog::DoDataExchange(pDX); >8#X;0\Kj  
 //{{AFX_DATA_MAP(CCaptureDlg) FWG6uKv  
  DDX_Control(pDX, IDC_KEY, m_Key); p o2!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9\mLW"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l:,'j@%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Gsq00j &<Z  
  DDX_Text(pDX, IDC_PATH, m_Path); tne ST.  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7>))D'l57  
 //}}AFX_DATA_MAP E%,^Yvh/  
} ZJzt~ H  
YSic-6z0Ms  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2j}\3Pi  
//{{AFX_MSG_MAP(CCaptureDlg) _M`--.{\O[  
 ON_WM_SYSCOMMAND() v50bdj9}k  
 ON_WM_PAINT() qzKdQ&vO  
 ON_WM_QUERYDRAGICON() c|B.n]Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2a`o &S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kwo3`b  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^cP!\E-^  
//}}AFX_MSG_MAP q1"$<# t  
END_MESSAGE_MAP() l3Q(TH~I  
e478U$  
BOOL CCaptureDlg::OnInitDialog() `(ue63AZ  
{ irFMmIb  
 CDialog::OnInitDialog(); {GK;63`1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 75f"'nJ)  
 ASSERT(IDM_ABOUTBOX < 0xF000); -pf}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hKLCJ#T  
 if (pSysMenu != NULL) (:TjoXXiY  
 { K/j3a[.  
  CString strAboutMenu; Wz49i9e+d  
  strAboutMenu.LoadString(IDS_ABOUTBOX); VM GS[qrG  
  if (!strAboutMenu.IsEmpty()) Tc>   
  { :cem,#(=  
   pSysMenu->AppendMenu(MF_SEPARATOR); &:9c AIe]H  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `scR*]f1+  
  } xW)2<m6C&  
 } D[aCsaR  
 SetIcon(m_hIcon, TRUE); // Set big icon )t0$qd ]  
 SetIcon(m_hIcon, FALSE); // Set small icon 42{Ew8  
 m_Key.SetCurSel(0); %GjM(;Tk  
 RegisterHotkey(); TN!j13,  
 CMenu* pMenu=GetSystemMenu(FALSE); Bu<M\w?7Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R]c+?4J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); y~ AVei&  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Pk{_(ybaY  
 return TRUE; // return TRUE unless you set the focus to a control @r/#-?W  
} \HxT@UQ)~  
A-Sv;/yD_  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #%a;"w  
{ ]i&6c  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8ndYV>{f  
 { ~ -4{B  
  CAboutDlg dlgAbout;  8n#HFJ~  
  dlgAbout.DoModal(); @Lpq~ 1eZB  
 } f=(?JT  
 else ZXqSH${Tp  
 { ?i7%x,g(Z  
  CDialog::OnSysCommand(nID, lParam); XX7{-Y y  
 } jqWu  
}  8{wwd:6  
aE`c%T):`  
void CCaptureDlg::OnPaint() x[wq]q#*  
{ M>wYD\oeg  
 if (IsIconic()) "9ZID-~]  
 { K SbKEA  
  CPaintDC dc(this); // device context for painting v~f HYa>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iZ#!O* >  
  // Center icon in client rectangle [;r)9mh7  
  int cxIcon = GetSystemMetrics(SM_CXICON); j@W.&- _  
  int cyIcon = GetSystemMetrics(SM_CYICON); (7mAt3n k  
  CRect rect; p#01gB  
  GetClientRect(&rect); u!!Y=!y*<  
  int x = (rect.Width() - cxIcon + 1) / 2; -E^vLB)O  
  int y = (rect.Height() - cyIcon + 1) / 2; ?x$"+,  
  // Draw the icon 3B1XZm  
  dc.DrawIcon(x, y, m_hIcon); AYt%`Y.!  
 } T}Km?d  
 else X\]L=>]C  
 { \kp8S'qVo  
  CDialog::OnPaint(); Gy9$wH@8  
 } mPOGidxix  
} $yn];0$J  
V@B__`y7  
HCURSOR CCaptureDlg::OnQueryDragIcon() S'|,oUWDb  
{ KX76UW   
 return (HCURSOR) m_hIcon; ~k\fhx  
} $*SW8'],`  
-(~.6WnhS  
void CCaptureDlg::OnCancel() ?+_Gs;DGVE  
{ E=jNi  
 if(bTray) O- ew%@_  
  DeleteIcon(); OglEt["  
  CDialog::OnCancel(); p6 ]7&{>  
} f1`gdQ)H  
^"VJd[Hn  
void CCaptureDlg::OnAbout() {v=T [D  
{ %@wJ`F2a_  
 CAboutDlg dlg; A'j;\ `1  
 dlg.DoModal(); aK&b{d  
} qmnZAk  
QP@%(]fG  
void CCaptureDlg::OnBrowse() rx $mk  
{ Qt iDTr  
 CString str; ^$%S &W  
 BROWSEINFO bi; *'OxAfa#x  
 char name[MAX_PATH]; b o0^3]Z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2VF%@p  
 bi.hwndOwner=GetSafeHwnd(); C+?Hm1  
 bi.pszDisplayName=name; N96jJk  
 bi.lpszTitle="Select folder"; -u&6X,Oq\u  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :}yi -/_8!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0Oi,#]F  
 if(idl==NULL) wmk *h-  
  return; O#x*iI%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p`mS[bxv!  
 str.ReleaseBuffer(); @|Fg,N<Y]  
 m_Path=str; fXXr+Mor  
 if(str.GetAt(str.GetLength()-1)!='\\') ]Oh@,V8  
  m_Path+="\\"; 3b*cU}go  
 UpdateData(FALSE); \X<bH&x:z  
} \[BK1JP  
A3rPt&<a  
void CCaptureDlg::SaveBmp() x1Lb*3Fe  
{ $i&e[O7T;  
 CDC dc; 3Dg,GaRk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1)9sf0LyU  
 CBitmap bm; zw+B9PYqX  
 int Width=GetSystemMetrics(SM_CXSCREEN); Q<z_/ j9  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~oI1 zNz/  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  gG uZ8:f  
 CDC tdc; {xwm^p(f  
 tdc.CreateCompatibleDC(&dc); Uh.oErHQD  
 CBitmap*pOld=tdc.SelectObject(&bm); hD\rtW  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VK}fsOnj0  
 tdc.SelectObject(pOld); aF)1Nm[  
 BITMAP btm; r9X?PA0f  
 bm.GetBitmap(&btm); (]b!{kS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; M>DaQ`b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >G);j@Q  
 BITMAPINFOHEADER bih; S7=Bd[4  
 bih.biBitCount=btm.bmBitsPixel; n_$ :7J  
 bih.biClrImportant=0; xG}(5Tt  
 bih.biClrUsed=0; W4hbK9y  
 bih.biCompression=0; e&7JpT  
 bih.biHeight=btm.bmHeight; bx<RV7>0  
 bih.biPlanes=1; #6ri-n  
 bih.biSize=sizeof(BITMAPINFOHEADER); A~Y^VEn  
 bih.biSizeImage=size; ZPiq-q  
 bih.biWidth=btm.bmWidth; &Ts-a$Z7?S  
 bih.biXPelsPerMeter=0; szsk;a  
 bih.biYPelsPerMeter=0; EPS={w$'s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )A!>=2M `  
 static int filecount=0; 9&upu jVS  
 CString name; $"0MU  
 name.Format("pict%04d.bmp",filecount++); /b]oa !  
 name=m_Path+name; |3F02  
 BITMAPFILEHEADER bfh; SfgU`eF%B  
 bfh.bfReserved1=bfh.bfReserved2=0; ?g?L3vRK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); rrQQZ5fhb  
 bfh.bfSize=54+size; XpmS{nb  
 bfh.bfOffBits=54; >2~+.WePu  
 CFile bf; Uu!f,L;ty  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @Gx.q&H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NLS%Sq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); r)Ap8?+  
  bf.WriteHuge(lpData,size); (Q%'N3gk  
  bf.Close(); d@ Y}SWTB  
  nCount++; _7IKzUn9g[  
 } m-H-6`]  
 GlobalFreePtr(lpData); `VKf3&|<A  
 if(nCount==1) la( <8  
  m_Number.Format("%d picture captured.",nCount); 4!+pc-}-  
 else Y]{ >^`G  
  m_Number.Format("%d pictures captured.",nCount); , #U .j  
  UpdateData(FALSE); &krwf ]|  
} SV:4GVf  
m>4ahue$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >tO`r.5u9  
{ /I)yU>o  
 if(pMsg -> message == WM_KEYDOWN) }:u~K;O87  
 { (S xR`QP?,  
  if(pMsg -> wParam == VK_ESCAPE) !PrwH;  
   return TRUE; j7sKsbb  
  if(pMsg -> wParam == VK_RETURN) Q-MQ9'  
   return TRUE; si&S%4(  
 } dFH$l  
 return CDialog::PreTranslateMessage(pMsg); )Psb>'X  
} WcHgBbNe  
T/^Hz4uA7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UNPezHaz  
{ i/~1F_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ jV? }9L^;  
  SaveBmp(); D[_|*9BC  
  return FALSE; mN!lo;m5  
} fO0(Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ SfJ./ny  
 CMenu pop; NZ/yBOD(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S,<EEtXQ  
 CMenu*pMenu=pop.GetSubMenu(0); TjQvAkT  
 pMenu->SetDefaultItem(ID_EXITICON); )RO<o O  
 CPoint pt; -RS7h  
 GetCursorPos(&pt); &VV~%jl;k  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :JfE QIN  
 if(id==ID_EXITICON) 4hAl-8~Q6  
  DeleteIcon(); K_2|_MLlZ  
 else if(id==ID_EXIT) rS4@1`/R  
  OnCancel(); +)j1.X  
 return FALSE; Zs}5Smjl;%  
} 3G uH857ov  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _~rI+lA  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X66VU  
 AddIcon(); Ma8_:7`>O  
 return res; x_c7R;C  
} )(tM/r4`c&  
[5uRS}!  
void CCaptureDlg::AddIcon() (tCUlX2  
{ /v/C<]  
 NOTIFYICONDATA data; wKi^C 8Z2  
 data.cbSize=sizeof(NOTIFYICONDATA); 7UL qo>j  
 CString tip; Ea?XT&,  
 tip.LoadString(IDS_ICONTIP); nPs7c %  
 data.hIcon=GetIcon(0); "=6v&G]U4  
 data.hWnd=GetSafeHwnd(); -s|}Rh?Y  
 strcpy(data.szTip,tip); w.lAQ5)I%\  
 data.uCallbackMessage=IDM_SHELL; OM|Fwr$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Pt&(npjN,  
 data.uID=98; %e`$p=m  
 Shell_NotifyIcon(NIM_ADD,&data); IBQ@{QB  
 ShowWindow(SW_HIDE); qwK2WE%T  
 bTray=TRUE; +J{0 E  
} Rb%%?*|  
(`6T&>(4  
void CCaptureDlg::DeleteIcon() ZxlAk+<]  
{ <)\y#N  
 NOTIFYICONDATA data; cZ(elZ0~  
 data.cbSize=sizeof(NOTIFYICONDATA); GEEW?8  
 data.hWnd=GetSafeHwnd(); V\})3i8  
 data.uID=98; _=q! BW  
 Shell_NotifyIcon(NIM_DELETE,&data); iSFuT7; %  
 ShowWindow(SW_SHOW); w|CZ7|6  
 SetForegroundWindow(); M @3"<[g  
 ShowWindow(SW_SHOWNORMAL); !q-f9E4`  
 bTray=FALSE; +uBLk0/)>  
} 0<8XI>.3D  
@x eAc0.^  
void CCaptureDlg::OnChange() P i Fm|  
{ P7 PB t  
 RegisterHotkey(); #-8\JEn  
} R(-<BtM!-  
}U SC1J  
BOOL CCaptureDlg::RegisterHotkey() BW"&6t#kA  
{ ,jC3Fcly  
 UpdateData(); +rIL|c}J  
 UCHAR mask=0; "+zCS|   
 UCHAR key=0; gORJWQv  
 if(m_bControl) +4\U)Z/\  
  mask|=4; ur vduE  
 if(m_bAlt) Yk42(!  
  mask|=2; |A%<Z(  
 if(m_bShift) t6BHGX{o  
  mask|=1; DfV~!bY  
  key=Key_Table[m_Key.GetCurSel()]; Y-'78BJk  
 if(bRegistered){ W5^.-B,(K  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /t6X(*xoy  
  bRegistered=FALSE; S!PzLTc  
 } .XkMk|t8  
 cMask=mask; $7QoMV8V  
 cKey=key; DAg58 =qJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); X[2[!)Rk  
 return bRegistered; \m=?xb8 f  
} A~Xq,BxCV  
bln/1iS  
  四、小结 m%"uPv\  
_/S?#   
  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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