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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: b5u8j  
  L^{1dVGWNa  
  一、实现方法 YXi'^GU@  
UBm L:Qv  
  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: +'ZJ]  
Jx jP'8  
#pragma data_seg("shareddata") +~x'1*A_  
HHOOK hHook =NULL; //钩子句柄 UK7pQt}9  
UINT nHookCount =0; //挂接的程序数目 S /kM#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4*D'zJsJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $\w<.)"#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <Pm!#)-g9  
static int KeyCount =0; b:M1P&R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5p}ri,Y<  
#pragma data_seg() 0{q>'dv  
zJ=lNb?q  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 NR6wNz&81  
+&*D7A>~p  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ILU7Yhk  
S <RbC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR n?[JPG2X  
cKey,UCHAR cMask) Mxmo}tt  
{ 5Qh$>R4!"  
 BOOL bAdded=FALSE; VK]cZ%)  
 for(int index=0;index<MAX_KEY;index++){ 5{"v/nXV  
  if(hCallWnd[index]==0){ l+vD`aJ3  
   hCallWnd[index]=hWnd; wqnHaWd*  
   HotKey[index]=cKey; ^c-8~r|y,  
   HotKeyMask[index]=cMask; <l.l6okp  
   bAdded=TRUE; I""zg^Rq  
   KeyCount++; i!a. 6Gq  
   break; )/y7Fh  
  } $0mR_pA\fW  
 } .DX-biX,  
 return bAdded; x@)G@'vV|  
} F{*h~7D-|  
//删除热键 s;ivoGe}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6L!/#d0  
{ \2c 3Nsra  
 BOOL bRemoved=FALSE; x_+-TC4IXn  
 for(int index=0;index<MAX_KEY;index++){ k',#T932x1  
  if(hCallWnd[index]==hWnd){ %4QpDt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;}dvc7  
    hCallWnd[index]=NULL; F<+!28&h  
    HotKey[index]=0; [X%Wg:K  
    HotKeyMask[index]=0; TlEd#XQgf&  
    bRemoved=TRUE; j%`% DQ  
    KeyCount--; 4F`&W*x  
    break; _t/~C*=:=  
   } BI|TM2oa  
  } P{ K;vEp  
 }  CK"OHjR  
 return bRemoved; tgVMgu  
} 7@1GSO:Yf  
]i:_^z)R  
[2P6XoI#  
  DLL中的钩子函数如下: N*`qsv 0  
H,3WdSL`K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0#S#v2r5  
{ _m.w5nJ  
 BOOL bProcessed=FALSE; x>bGxDtu*  
 if(HC_ACTION==nCode) q21l{R{Y  
 { QMhvyzkS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5<>"d :9  
   switch(wParam) ^ 7SE2Zi  
   {  bk=ee7E7>  
    case VK_MENU: >\o._?xSA  
     MaskBits&=~ALTBIT; Ab In\,x  
     break; kj>!&W57  
    case VK_CONTROL: sW,JnR  
     MaskBits&=~CTRLBIT; i,B<k 0W9  
     break; dJjkH6%}  
    case VK_SHIFT: M-8`zA2  
     MaskBits&=~SHIFTBIT; #I"s{*  
     break; _M) G  
    default: //judge the key and send message 2j;9USZ p  
     break; F;L8FL-  
   } 'N3)>!Y:8  
   for(int index=0;index<MAX_KEY;index++){ Fy$f`w_H@  
    if(hCallWnd[index]==NULL) 2 oo/KndU  
     continue; `tPVNO,l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (2Z k fN  
    { [Qqomm.[\w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6E-AfY'<  
     bProcessed=TRUE; -.OZ  
    } 3c=>;g  
   } 6]sP"  
  } cSTF$62E  
  else if((lParam&0xc000ffff)==1){ //有键按下 (6*  
   switch(wParam) yu>o7ie+;Y  
   { .%EYof  
    case VK_MENU: NZ"nG<;5  
     MaskBits|=ALTBIT; r])V6 ^U  
     break; 82M` sk3.  
    case VK_CONTROL: SU5O+;{`'  
     MaskBits|=CTRLBIT; G1fC'6$3  
     break; ka_(8  
    case VK_SHIFT: +# 3e<+!F  
     MaskBits|=SHIFTBIT; !(HPx@_  
     break; D&{CC  
    default: //judge the key and send message T I|h  
     break; v1rTl5H  
   } tv_&PIu]L  
   for(int index=0;index<MAX_KEY;index++){ bXi!_'z$  
    if(hCallWnd[index]==NULL) P~M[i9 V  
     continue; 1,(WS F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PX*}.L *x  
    { 1\a.o[g3e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W\2 ']7}e  
     bProcessed=TRUE; V}Ee1C  
    } :,ucJ|  
   } #g/m^8n?s  
  } \10KIAQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3 "iBcsLn  
   for(int index=0;index<MAX_KEY;index++){ O 6ph_$nt.  
    if(hCallWnd[index]==NULL) [MuZ^'dR  
     continue; ?t5<S]'r$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UqD ]@s`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /i~x.i3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 zI0d  
   } S Rk%BJ? ~  
  } NBL%5!'  
 } .8->n aj|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J&iSS9c  
} #aQQd8   
2EO x],(|  
  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"XwO8yhM  
fy$?~Ji &  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?N(<w?Gat  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .1}1e;f-  
84!Hd.H  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: UiVGOQq  
d_Jj&:"l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z5 p [*LMO  
{ Gj?$HFa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6?Kl L [~  
 {  !TivQB  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 l/,la]!T  
  SaveBmp(); qW`?,N)r  
  return FALSE; fwvwmZW  
 } &)jq3  
 …… //其它处理及默认处理 _RIlGs\.  
} bZ_TW9mq  
'J$@~P  
9GRQ^E  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 zn>+ \  
wBvVY3VQ^  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 =P%&]5ts  
;{aGEOP'U  
  二、编程步骤 `U=Jbdc l3  
Af\  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Vm[F~2+HX  
*NG\3%}%|@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Xo:Mar  
2e-`V5{)b  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; x0b=r!Duu  
v$D U q+  
  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; x5CMP%}d  
tXqX[Td`0g  
  5、 添加代码,编译运行程序。 2n$Wey[  
}h=PW'M{  
三、程序代码 M\/hK2J# #  
]BUirJ,2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL eXMIRus(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -r_,#LR!l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ x. #E3xI  
#if _MSC_VER > 1000 gXlcB~!  
#pragma once x9AFN  
#endif // _MSC_VER > 1000 $btu=_|f  
#ifndef __AFXWIN_H__ cS'{h  
#error include 'stdafx.h' before including this file for PCH EK5$z>k>m  
#endif 0>8w On  
#include "resource.h" // main symbols uorX;yekC  
class CHookApp : public CWinApp %S"85#R5E  
{ tRpY+s~Fq  
 public: araXE~Ac  
  CHookApp(); 7f}uRXBV$A  
  // Overrides 14" 57Jt8  
  // ClassWizard generated virtual function overrides J jm={+@+  
  //{{AFX_VIRTUAL(CHookApp) eZ+6U`^t  
 public: w|6/i/X  
  virtual BOOL InitInstance(); q" f65d4c  
  virtual int ExitInstance(); vc&v+5Y  
  //}}AFX_VIRTUAL pY@QR?F\  
  //{{AFX_MSG(CHookApp) !6 L!%Oi  
  // NOTE - the ClassWizard will add and remove member functions here. Pmo<t6  
  // DO NOT EDIT what you see in these blocks of generated code ! :SS \2  
  //}}AFX_MSG 5 ty2e`~K  
  DECLARE_MESSAGE_MAP() I`_I^C3  
}; Y X^c}t}U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j<P;:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s~].iQJ{B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W2#<]]-  
BOOL InitHotkey();  [#C6K '  
BOOL UnInit(); GdcXU:J /  
#endif rHTZM,zM=H  
!8[T*'LJ-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4`,7 tj  
#include "stdafx.h" DtFHh/X  
#include "hook.h" 9xO@_pkX  
#include <windowsx.h> K^U ="  
#ifdef _DEBUG A1INaL  
#define new DEBUG_NEW ZX` \so,&,  
#undef THIS_FILE DH yv^  
static char THIS_FILE[] = __FILE__; 2t9UJu4  
#endif mmbe.$73  
#define MAX_KEY 100 @t~y9UfF  
#define CTRLBIT 0x04 h@Ea5x  
#define ALTBIT 0x02 mpug#i6q  
#define SHIFTBIT 0x01 CYLab5A  
#pragma data_seg("shareddata") .@E5dw5  
HHOOK hHook =NULL; DPjs? M<  
UINT nHookCount =0; Lo%vG{yTr  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vI I{i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT U8 Zb&6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @k&6\1/U  
static int KeyCount =0; \^*:1=|7u]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift $j.;$~F  
#pragma data_seg() 1oej<67PdJ  
HINSTANCE hins; I09 W=  
void VerifyWindow(); O{_t*sO9q*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [M[<'+^*  
//{{AFX_MSG_MAP(CHookApp) 8Y.q P"s  
// NOTE - the ClassWizard will add and remove mapping macros here. v*?8:>:}  
// DO NOT EDIT what you see in these blocks of generated code! !i)!|9e  
//}}AFX_MSG_MAP v?OVhV  
END_MESSAGE_MAP() lG\uJxV  
'RV96lX<  
CHookApp::CHookApp() =S`h/fru  
{ Ohk\P;}  
 // TODO: add construction code here, <rj'xv  
 // Place all significant initialization in InitInstance 7DJEx~"!2-  
} 5[Vr {^)  
B=TUZ)  
CHookApp theApp; oI{.{]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hK3-j;eg  
{ x<gmDy*  
 BOOL bProcessed=FALSE; yws'}{8  
 if(HC_ACTION==nCode) <E4(KE  
 { Tse#{  
  if((lParam&0xc0000000)==0xc0000000){// Key up GIM/T4!)  
   switch(wParam) q$:7j5E  
   { 5_aj]"x  
    case VK_MENU: +PjTT6  
     MaskBits&=~ALTBIT; QQS*r}>  
     break; YWK0.F,8a  
    case VK_CONTROL: `/PBZnj  
     MaskBits&=~CTRLBIT; ;[}OZt  
     break; f%,S::%Ea  
    case VK_SHIFT: \Nt 5TG_  
     MaskBits&=~SHIFTBIT; K9#kdo1 2  
     break; ?Ts]zO%%Z  
    default: //judge the key and send message Gk*u^J(  
     break; uaF-3  
   } R^.PKT2E  
   for(int index=0;index<MAX_KEY;index++){ &))d],tJX  
    if(hCallWnd[index]==NULL) YCD |lL#  
     continue; /P*XB%y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t2o{=!$WH  
    { Ojc Tu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o~~;I  
     bProcessed=TRUE; }QCnN2bV  
    } X[o+Y@bc  
   } !0,q[|m  
  } Wlhh0uy  
  else if((lParam&0xc000ffff)==1){ //Key down T]De{nHu  
   switch(wParam) SA +d4P_T  
   { +c))fPuV  
    case VK_MENU: O`~#X w  
     MaskBits|=ALTBIT; OJcS%-~  
     break; YRlfU5  
    case VK_CONTROL: KEOk%'c,  
     MaskBits|=CTRLBIT; +>#SNZ[  
     break; ;qgo=  
    case VK_SHIFT: 2R&\qZ<  
     MaskBits|=SHIFTBIT; 4=^_VDlpd  
     break; ~S/oW89  
    default: //judge the key and send message r%.k,FzGZY  
     break; r @4A% ql<  
   } t(#9.b`W)  
   for(int index=0;index<MAX_KEY;index++) ?XHQdN3e  
   { e]RzvWq  
    if(hCallWnd[index]==NULL) a<<4gXx  
     continue; ]@#9B>v=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^v; )6a2  
    { Y)1/f EM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )%K<pIk  
     bProcessed=TRUE; !zX() V  
    } #hxYB  
   } 5skN'*oG  
  } 9-;-jnDy  
  if(!bProcessed){ 4aS}b3=n  
   for(int index=0;index<MAX_KEY;index++){ Z\nDR|3  
    if(hCallWnd[index]==NULL) A9.TRKb=8  
     continue; ^O_Z5NbC3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xsH1)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M@cFcykK  
   } |T|m5V'l  
  } CeYhn\m5K0  
 } 4-yK!LR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CVfV    
} x(Bt[=,K3  
ZM.'W}J{ *  
BOOL InitHotkey() PQ 4mNjXN  
{ RsZj  
 if(hHook!=NULL){ sUG!dwqqd  
  nHookCount++; Y :!L  
  return TRUE; 2`4m"DtA  
 } Oh! {E5!)  
 else [[$C tqLg  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;:6\w!fc  
  if(hHook!=NULL) \V>5)R n  
   nHookCount++; N{v)pu.  
  return (hHook!=NULL); 0nb%+],pX  
} TF8#I28AD  
BOOL UnInit() ^p3 GT6  
{ j9+4},>>CU  
 if(nHookCount>1){ B->AY.&j  
  nHookCount--; 4C*ywP  
  return TRUE; (.4lsKN<  
 } Tvx1+0Z%z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); d6J/)nl  
 if(unhooked==TRUE){ v6*0@/L M  
  nHookCount=0; aFTWzz  
  hHook=NULL; Zonjk%tC  
 } ;QBS0x\f@  
 return unhooked; &en. m>9,  
} O&l4/RtQ\)  
$r!CQ 2S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~7 i{~<?  
{ JIySe:p3  
 BOOL bAdded=FALSE; ^ }7O|Y7  
 for(int index=0;index<MAX_KEY;index++){ A8m06  
  if(hCallWnd[index]==0){ 1$&@wG  
   hCallWnd[index]=hWnd; fp [gKRSF  
   HotKey[index]=cKey; 4'O,xC  
   HotKeyMask[index]=cMask; ?9~^QRLT  
   bAdded=TRUE; u}5CzV`  
   KeyCount++; {,%&}kd>  
   break; cwmS4^zt8  
  } ME)Tx3d  
 } qfDG.Zee#  
 return bAdded; aZmN(AJ8v  
} QC+ Z6WS;  
&r1(1<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %66="1z0@  
{ t /+;#-  
 BOOL bRemoved=FALSE;  cyl%p$  
 for(int index=0;index<MAX_KEY;index++){ ,';|CGI cP  
  if(hCallWnd[index]==hWnd){ {+J{t\`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PJ5}c!o[  
    hCallWnd[index]=NULL; 3]*Kz*i  
    HotKey[index]=0; ? "I %K%  
    HotKeyMask[index]=0; tl 0|.Q,  
    bRemoved=TRUE; hE&6;3">  
    KeyCount--; es)^^kGj6f  
    break; tkj-.~@g0'  
   }  >. K  
  } flmQNrC.8  
 } \FsA-W\X  
 return bRemoved; 0/GBs~P  
}  @lN\.O  
\W*L9azr  
void VerifyWindow() $*0-+h  
{ ^\}qq>_  
 for(int i=0;i<MAX_KEY;i++){ qZd*'ki<  
  if(hCallWnd!=NULL){ aKj|gwo!  
   if(!IsWindow(hCallWnd)){ ]RT  
    hCallWnd=NULL; s 47R,K$  
    HotKey=0; wKM9fs  
    HotKeyMask=0; =|?`5!A  
    KeyCount--; P73GH  
   } qX@e+&4P0  
  } 99=~vNn  
 } NH/A`Wm  
} Tx.N#,T|  
?#z$(upQ  
BOOL CHookApp::InitInstance() Py;5z  
{ 6}6Q:V|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *)E${\1'<  
 hins=AfxGetInstanceHandle(); d"FB+$  
 InitHotkey(); G0 )[(s  
 return CWinApp::InitInstance(); V ?Jy  
} $S#Z>d*1!  
^2k jO/  
int CHookApp::ExitInstance() Rt#QW*h\|i  
{ YmC}q20;  
 VerifyWindow(); CP7Fe{P  
 UnInit(); 8B G Z  
 return CWinApp::ExitInstance(); <U3X4)r  
} @vl$[Z|  
!8G)` '  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &Gt{9#  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B'yjMY![  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [BE_^d5&  
#if _MSC_VER > 1000 => (g_\  
#pragma once  R0Vt_7  
#endif // _MSC_VER > 1000 Eg)24C R 4  
(%B{=w}8  
class CCaptureDlg : public CDialog H\>{<`sD;f  
{ ^{}G4BEY  
 // Construction NTu |cX\R  
 public: j=O+U _w  
  BOOL bTray; T1d@=&0"  
  BOOL bRegistered; vFk@  
  BOOL RegisterHotkey(); lAN&d;NU6Z  
  UCHAR cKey; > Z+*tq  
  UCHAR cMask; 9Vt ^q%DC  
  void DeleteIcon(); 3'uXU<W!  
  void AddIcon(); pbx*Y`v  
  UINT nCount; 63 oe0T&  
  void SaveBmp(); PLz{EQ[cV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {?`rGJ{f  
  // Dialog Data (7g"ppf  
  //{{AFX_DATA(CCaptureDlg) _mqU:?Q5  
  enum { IDD = IDD_CAPTURE_DIALOG }; bL7Gkbs&|  
  CComboBox m_Key; Cu+p!hV  
  BOOL m_bControl; ;U'\"N9  
  BOOL m_bAlt; 3= =["hO  
  BOOL m_bShift; ,!{8@*!=s  
  CString m_Path; =p;cJ%#2]'  
  CString m_Number; d_`MS@2  
  //}}AFX_DATA ":/c|!  
  // ClassWizard generated virtual function overrides C98F?uo%Q  
  //{{AFX_VIRTUAL(CCaptureDlg) ?g ,s<{  
 public: !gkr?yhE  
  virtual BOOL PreTranslateMessage(MSG* pMsg); A;d@NOI#,K  
 protected: |qX ?F`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a[K&;)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L/u|90) L  
  //}}AFX_VIRTUAL +ay C 0  
  // Implementation LaJvPOQ  
 protected: >>{):r Z  
  HICON m_hIcon; J2Dn  
  // Generated message map functions @(#vg\UH  
  //{{AFX_MSG(CCaptureDlg) U,U=udsi  
  virtual BOOL OnInitDialog(); pb97S^K[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UCVYO. 9"  
  afx_msg void OnPaint(); "pDU v^ie  
  afx_msg HCURSOR OnQueryDragIcon(); 2 ,nhs,FZ  
  virtual void OnCancel(); Ic&~iqQ  
  afx_msg void OnAbout(); uj3`M9  
  afx_msg void OnBrowse(); #2^0z`-\_z  
  afx_msg void OnChange(); F${sEtH  
 //}}AFX_MSG Qf_N,Bq{a  
 DECLARE_MESSAGE_MAP() |mH* I  
}; ya2sS9^T[  
#endif 4XAB_Q  
j55_wx@cA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C|]c#X2t3  
#include "stdafx.h" VrW]|jIu*  
#include "Capture.h" ]|3hK/  
#include "CaptureDlg.h" Cj>HMB}  
#include <windowsx.h> &n1Vv_Lb  
#pragma comment(lib,"hook.lib") }Q`+hJ0  
#ifdef _DEBUG Hdyl]q-(P  
#define new DEBUG_NEW ;> 7~@ K  
#undef THIS_FILE ZRjM^ d;  
static char THIS_FILE[] = __FILE__; aA?Qr&]M  
#endif 7u"Q1n(h/  
#define IDM_SHELL WM_USER+1 %i\rw*f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CNRSc 4Le  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XgxO:"B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W<q<}RSn  
class CAboutDlg : public CDialog % i?  
{ Py*WHHO  
 public: bg|$1ue  
  CAboutDlg(); j*QdD\)  
  // Dialog Data ZW;Ec+n_K  
  //{{AFX_DATA(CAboutDlg) Qy9_tvq X  
  enum { IDD = IDD_ABOUTBOX }; :0@0muo  
  //}}AFX_DATA |r+ x/,2-  
  // ClassWizard generated virtual function overrides 4]1/{</B|  
  //{{AFX_VIRTUAL(CAboutDlg) 6?,qysm06  
 protected: xtGit}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J;>;K6pW  
  //}}AFX_VIRTUAL B}04E^  
  // Implementation ILCh1=?{9r  
 protected: al#(<4sJ  
  //{{AFX_MSG(CAboutDlg) ;\th.!'rn  
  //}}AFX_MSG .J-k^+-  
  DECLARE_MESSAGE_MAP() 1V`-D8-?  
}; 6OE xAn8  
CY?J$sN  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EC\@$Fg  
{ D<v< :  
 //{{AFX_DATA_INIT(CAboutDlg) :'r* 5EX  
 //}}AFX_DATA_INIT |gV~U~A]  
} 3\Amj}RJ  
iJOoO"Ai  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) xlZh(pf  
{ J-+mdA  
 CDialog::DoDataExchange(pDX); 3F, M{'q  
 //{{AFX_DATA_MAP(CAboutDlg) ;jxX/c  
 //}}AFX_DATA_MAP 2+ u+9rW  
} @~gPZm  
d%}?%VH  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $/^Y(0  
 //{{AFX_MSG_MAP(CAboutDlg) GQg 2!s(  
 // No message handlers DvhF CA}z  
 //}}AFX_MSG_MAP 1[OY- G  
END_MESSAGE_MAP() "#Z e3Uy\  
:[l}Bb,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $-DW+|p.?^  
: CDialog(CCaptureDlg::IDD, pParent) A23K!a2u&  
{ \@PMj"p|:  
 //{{AFX_DATA_INIT(CCaptureDlg) ~V(>L=\V;  
  m_bControl = FALSE; 8/2Wq~&  
  m_bAlt = FALSE; UK OhsE  
  m_bShift = FALSE; F$>#P7ph\a  
  m_Path = _T("c:\\"); .;31G0<w2  
  m_Number = _T("0 picture captured."); u"5/QB{  
  nCount=0; J4]"@0?6  
  bRegistered=FALSE; Hd4 ~v0eS  
  bTray=FALSE; iM!V4Wih6  
 //}}AFX_DATA_INIT 7r,GdP.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V@+sNM  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jA8Bmwt;w  
} MZV bOcSAd  
bBINjs8C_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~~Cd9Hzi  
{ +Q"s!\5  
 CDialog::DoDataExchange(pDX); &K!0yR  
 //{{AFX_DATA_MAP(CCaptureDlg) _&(Wz0  
  DDX_Control(pDX, IDC_KEY, m_Key); 7/&taw%i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #l>r9Z71  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^XyC[ G@[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &7kLSb&|;  
  DDX_Text(pDX, IDC_PATH, m_Path); bZSt<cH3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =?L16mu1&  
 //}}AFX_DATA_MAP =WN8> <K!  
} $o9^b Z  
:hO B  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y<gRl/e  
//{{AFX_MSG_MAP(CCaptureDlg) '3^_:E5y  
 ON_WM_SYSCOMMAND() c-zW 2;|61  
 ON_WM_PAINT() jB -A d8  
 ON_WM_QUERYDRAGICON() D7R;IA-w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) % A 5s?J?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fC"? r6d  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <> HI(6\@Z  
//}}AFX_MSG_MAP D0\*WK$  
END_MESSAGE_MAP() 7.{+8#~nV  
J%Y-3{TQK  
BOOL CCaptureDlg::OnInitDialog() %eF=;q  
{ TH>uL;?=  
 CDialog::OnInitDialog();  pb<eg,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q_/UC#I8  
 ASSERT(IDM_ABOUTBOX < 0xF000); Oc~<`C~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ,X| >d  
 if (pSysMenu != NULL) kFQo[O]  
 { G{pF! q  
  CString strAboutMenu;  ]x1ba_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K\}qY dPF  
  if (!strAboutMenu.IsEmpty()) C^JtJv  
  { U0|wC,7"  
   pSysMenu->AppendMenu(MF_SEPARATOR); <_8eOL<X  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1Xcj=I- 4  
  } Mj0jpP<uf  
 } ?/3{gOgI$`  
 SetIcon(m_hIcon, TRUE); // Set big icon H5vg s2R  
 SetIcon(m_hIcon, FALSE); // Set small icon H(?+-72KX  
 m_Key.SetCurSel(0); B*`[8kb,  
 RegisterHotkey(); DbI)tDi5D  
 CMenu* pMenu=GetSystemMenu(FALSE); "@+Z1k-8U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CC6]AM(i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m,5m'9 dj  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "V:RKH`  
 return TRUE; // return TRUE unless you set the focus to a control /.mx\_$   
} | v>W  
N#OO{`":Z`  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $W;r S7b  
{ 2e,cE6r  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |em_l$oGc  
 { BN`tiPNEp  
  CAboutDlg dlgAbout; Zz|et206  
  dlgAbout.DoModal(); }!kvoV)]1  
 } 7Or?$  
 else 3cqc<  
 { M%13b$i~f  
  CDialog::OnSysCommand(nID, lParam); J"eE9FLM  
 } 0CeBU(U+|R  
} NljcHe}Qy  
!{r@ H+Kf  
void CCaptureDlg::OnPaint() 'cN3Vv k  
{ Rs]Y/9F;{  
 if (IsIconic()) 1b7Q-elG  
 { 06af{FXsGb  
  CPaintDC dc(this); // device context for painting G`v(4`tA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); uMFV^&ZF  
  // Center icon in client rectangle 9j5k=IXg#a  
  int cxIcon = GetSystemMetrics(SM_CXICON); Y>i Qp/k:  
  int cyIcon = GetSystemMetrics(SM_CYICON); %B>>J%  
  CRect rect; #3C] "  
  GetClientRect(&rect); \!)1n[N  
  int x = (rect.Width() - cxIcon + 1) / 2; LqQ&4I  
  int y = (rect.Height() - cyIcon + 1) / 2; V'N]u (^  
  // Draw the icon \ 0F ey9c  
  dc.DrawIcon(x, y, m_hIcon); 3 lKBwjW  
 } CTB qX  
 else 30cb+)h(  
 { %Bnn\{Az  
  CDialog::OnPaint(); 0#sf,ja>  
 } bhjJH,%_>  
} r*Z p-}  
pr \OjpvD  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2G/CN"  
{ @oRo6Y<-  
 return (HCURSOR) m_hIcon; f2P2wt.$  
} n~yhX%=_Du  
`g'9)Xf4KT  
void CCaptureDlg::OnCancel() TwZmZE ?!  
{ !5zj+N  
 if(bTray) \S#![NC  
  DeleteIcon(); Q=498Y~x  
  CDialog::OnCancel(); ynq^ztBVe  
} $.Qq:(O:6  
d-UQc2r  
void CCaptureDlg::OnAbout() Eye.#~  
{ d r=h;[Q'  
 CAboutDlg dlg; OLJ|gunA#  
 dlg.DoModal(); H1ox>sC  
} UDgUbi^v|D  
%c&< {D}r  
void CCaptureDlg::OnBrowse() V(!-xu1,  
{ )K 0rPnYV  
 CString str; 8{%[|Ye  
 BROWSEINFO bi; ?h-:,icR  
 char name[MAX_PATH]; $2v{4WP7G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y7@$#/1  
 bi.hwndOwner=GetSafeHwnd(); ]%6XE)  
 bi.pszDisplayName=name; 2$> <rB  
 bi.lpszTitle="Select folder"; tb'O:/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Z-'xJq  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s+ ]6X*)  
 if(idl==NULL) lDtl6r/  
  return; Ix+\oq,O  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >f~y2YAr  
 str.ReleaseBuffer(); c ^+{YH;k  
 m_Path=str; }C{wGK+o[  
 if(str.GetAt(str.GetLength()-1)!='\\') -]Q6Ril  
  m_Path+="\\"; Xa=oEG  
 UpdateData(FALSE); uPL|3ACS  
} -*0U&]T  
|s[k= /~"  
void CCaptureDlg::SaveBmp() UV)!zgP  
{ vt2A/9_Z%  
 CDC dc; ~&8bVA= .  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sG k'G573  
 CBitmap bm; uKpWb1(  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6tT*b@/_o  
 int Height=GetSystemMetrics(SM_CYSCREEN); CDDOm8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E<4'4)FHuQ  
 CDC tdc; @]:GTrs  
 tdc.CreateCompatibleDC(&dc); ^U{SUWl  
 CBitmap*pOld=tdc.SelectObject(&bm); j |:{ B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =7%c*O <  
 tdc.SelectObject(pOld); A}(Q^|6  
 BITMAP btm; \9jvQV/y  
 bm.GetBitmap(&btm); uY$BZEuAZ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t8z=R6zX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (Q][d+} /  
 BITMAPINFOHEADER bih; 6n Hyd<o  
 bih.biBitCount=btm.bmBitsPixel; -@G,Ry-\t  
 bih.biClrImportant=0; S5xum_Dq  
 bih.biClrUsed=0; !:<n]-U  
 bih.biCompression=0; P4dhP-t  
 bih.biHeight=btm.bmHeight; ]^DNzqu=@h  
 bih.biPlanes=1; ~V!gHJ5M  
 bih.biSize=sizeof(BITMAPINFOHEADER); <(dg^;  
 bih.biSizeImage=size; L[.RV*sL  
 bih.biWidth=btm.bmWidth; ^q)s  
 bih.biXPelsPerMeter=0; l]__!X  
 bih.biYPelsPerMeter=0; u+,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z+qrsT/?L  
 static int filecount=0; qHra9yuSh  
 CString name; )Vnqz lI5  
 name.Format("pict%04d.bmp",filecount++); 2:Q2w3Xe  
 name=m_Path+name; tG(!d$^  
 BITMAPFILEHEADER bfh; )U u! x6  
 bfh.bfReserved1=bfh.bfReserved2=0; z(_#C s  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0fQMOTpOp  
 bfh.bfSize=54+size; J^<}fRw  
 bfh.bfOffBits=54; {Z{!tR?+  
 CFile bf; ~jn~M_}K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4ROuy+Ms'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q\[2BJo/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8k -l`O~  
  bf.WriteHuge(lpData,size); ^Jdji:  
  bf.Close(); vSG$ 2g=  
  nCount++; )l"py9STF  
 } ?*2Uw{~}  
 GlobalFreePtr(lpData); zDx*R3%  
 if(nCount==1) };s8xGW:k3  
  m_Number.Format("%d picture captured.",nCount); 7xy[;  
 else 1;N5@0%p  
  m_Number.Format("%d pictures captured.",nCount); `KUl XS(  
  UpdateData(FALSE); 1|/]bffg!c  
} iF'qaqHWY4  
!1cVg ls|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "kg;fF|  
{ `78)|a*R.  
 if(pMsg -> message == WM_KEYDOWN) [5sa1$n96G  
 { s'yT}XQ;r  
  if(pMsg -> wParam == VK_ESCAPE) b1ma(8{{{  
   return TRUE; qD<\U  
  if(pMsg -> wParam == VK_RETURN) wj#A#[e  
   return TRUE; S[5e,E w  
 } `hE@S |4  
 return CDialog::PreTranslateMessage(pMsg); W"*~1$vf  
} tunjV1 ,]  
Z@{e\sZ)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d\A!5/LG  
{ IIIP<nyc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =E10j.r  
  SaveBmp(); :B"Y3~I  
  return FALSE; 9L9+zs3 k  
} On4tK\l @  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ TIre,s)_  
 CMenu pop; Tkf JC|6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); k@/s-^ry3  
 CMenu*pMenu=pop.GetSubMenu(0); |w w@V<'/#  
 pMenu->SetDefaultItem(ID_EXITICON); 1a>TJdoa  
 CPoint pt; Q% LQP!Kg  
 GetCursorPos(&pt); UUaC@Rs2  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oVYW '~OID  
 if(id==ID_EXITICON) EX9os  
  DeleteIcon(); |v31weD8  
 else if(id==ID_EXIT) t1MK5B5jH  
  OnCancel(); B #zU'G*Y  
 return FALSE; MiB}10  
} ~gJJ@j 0n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <b$.{&K  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }6!*H!  
 AddIcon(); 40)Ti  
 return res;  4fa2_  
} Qy_! +q  
S<bsrS*$  
void CCaptureDlg::AddIcon() ;j^C35  
{ 8ZPjzN>c6  
 NOTIFYICONDATA data; 1NQstmd{  
 data.cbSize=sizeof(NOTIFYICONDATA); JuTIP6 /G  
 CString tip; 4%9 +="  
 tip.LoadString(IDS_ICONTIP); 1DT}_0{0Q  
 data.hIcon=GetIcon(0); 7r,h[9~e  
 data.hWnd=GetSafeHwnd(); deVbNg8gs  
 strcpy(data.szTip,tip); UG:S!w'  
 data.uCallbackMessage=IDM_SHELL; $ =GnoS  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; TM2pE/P  
 data.uID=98; %6eQ;Rp*  
 Shell_NotifyIcon(NIM_ADD,&data); +(l(|lQy$  
 ShowWindow(SW_HIDE); E[kf%\  
 bTray=TRUE; (Y>|P  
} pRrokYM d  
wseb]=U  
void CCaptureDlg::DeleteIcon() 7IUu] Fi  
{ Gbrc!3K2  
 NOTIFYICONDATA data; IP=."w  
 data.cbSize=sizeof(NOTIFYICONDATA); FhVoN}  
 data.hWnd=GetSafeHwnd(); h<I C d'!  
 data.uID=98; U,2H) {l/  
 Shell_NotifyIcon(NIM_DELETE,&data); (&^k''f  
 ShowWindow(SW_SHOW); ;N;['xcx;  
 SetForegroundWindow(); ('Doy1L  
 ShowWindow(SW_SHOWNORMAL); nkii0YB!  
 bTray=FALSE; 8^>qzaf 8  
} `D~wY^q{  
 "yA=Tw  
void CCaptureDlg::OnChange() I@jXW>$  
{ ,wPvv(b]a  
 RegisterHotkey(); ZtPnHs.x  
} uk=f /nT  
Zm+QhnY|  
BOOL CCaptureDlg::RegisterHotkey() iz @LS  
{ O/1:2G/`  
 UpdateData(); I5mtr  
 UCHAR mask=0; W&`{3L  
 UCHAR key=0; m(o^9R_=^9  
 if(m_bControl) NGq@x%T  
  mask|=4; lz >>{  
 if(m_bAlt) )E>nr Z  
  mask|=2; ~D1&CT#s  
 if(m_bShift) |w3b!  
  mask|=1; 6Ud6F t6  
  key=Key_Table[m_Key.GetCurSel()]; [ 30ta<-  
 if(bRegistered){ yZcnky  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); lZ>j:/R8^&  
  bRegistered=FALSE; ngI3.v/R  
 } cypb 6Q_  
 cMask=mask; ZW)_dg9  
 cKey=key; -gK*&n~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vn5O8sD  
 return bRegistered; odaCKhdk  
} L2<IG)oXU  
wJ Qm7n-+  
  四、小结 h5^qo ^;g7  
FBGe 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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