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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: -sP9E|/:'3  
  lTn;3'  
  一、实现方法 5fU!'ajaN7  
)URwIe{  
  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: g+:$X- r  
#N; $  
#pragma data_seg("shareddata") ;_x2 Ymw  
HHOOK hHook =NULL; //钩子句柄 C#Y,r)l  
UINT nHookCount =0; //挂接的程序数目 4DvdE t  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <MRC%!.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G?>qd}]y0L  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K3Huu!Tr  
static int KeyCount =0; [0K=I64 z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2q12y Y f  
#pragma data_seg() $Xf~# uH  
X>2? `8M  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 4\v~HFsv  
Z&TD+fT<  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: i"/r)>"b  
)sqaR^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8^i\Y;6  
cKey,UCHAR cMask) 'zE: fLo  
{ F/)f,sZF  
 BOOL bAdded=FALSE; KUbJe)}g  
 for(int index=0;index<MAX_KEY;index++){ K/DH / r  
  if(hCallWnd[index]==0){ XnD0eua#  
   hCallWnd[index]=hWnd; 5Qb;2!  
   HotKey[index]=cKey; Pv#KmSA9  
   HotKeyMask[index]=cMask; 6s'[{Ov  
   bAdded=TRUE; 7Ez}k}aR<  
   KeyCount++; GM:, CJ?  
   break; x 96}#0'  
  } l+oDq'[q"  
 } X#VEA=4{  
 return bAdded; A5+q^t}  
} ;.\g-`jb  
//删除热键 ~'(9?81d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yz2(_@R  
{ sbzeY 1  
 BOOL bRemoved=FALSE; 9-B@GFB;8  
 for(int index=0;index<MAX_KEY;index++){ D^N[=q99&e  
  if(hCallWnd[index]==hWnd){  X@cSP7b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^Wf S\M`  
    hCallWnd[index]=NULL; g/x_m.  
    HotKey[index]=0; B .El a  
    HotKeyMask[index]=0; FZeP<Ban  
    bRemoved=TRUE; U8E0~[y'  
    KeyCount--; *jGPGnSo  
    break; (yfXMp,x  
   } %t q&  
  } Kf|0*c  
 } (s&ORoVGn  
 return bRemoved; '\@WN]  
} hUBF/4s\  
_'&k#Q  
2,+d|1(4o  
  DLL中的钩子函数如下:  70{RDj6{  
|l$ u<3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f]c <9Q>*  
{ UB a-  
 BOOL bProcessed=FALSE; bZu$0IG  
 if(HC_ACTION==nCode) L,6MF,vx  
 { 5|5=Y/   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ad9EG#mD#  
   switch(wParam) f:S}h-AL&  
   {  A3j"/eKi2  
    case VK_MENU: )x)gHY8;  
     MaskBits&=~ALTBIT; % ^e@`0L  
     break; 3<+z46`?  
    case VK_CONTROL: z[*zuo  
     MaskBits&=~CTRLBIT; KA?v.s  
     break; & wOE\TCL  
    case VK_SHIFT: 8'+7i8e  
     MaskBits&=~SHIFTBIT; (,shiK[5f  
     break; TKd6MZhT  
    default: //judge the key and send message Gj)uy jct  
     break; Zct!/u9 Q  
   } z1#oW f{*  
   for(int index=0;index<MAX_KEY;index++){ <vL}l:r  
    if(hCallWnd[index]==NULL) f*v1J<1#  
     continue; {|Bd?U;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2HSb.&7-G  
    { l`* ( f9Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4Q$!c{Y r  
     bProcessed=TRUE; 2!BsEvB(  
    } 6oYIQ'hc  
   } pG~'shD~Dn  
  } 7pz\ScSe  
  else if((lParam&0xc000ffff)==1){ //有键按下 @\!ww/QT  
   switch(wParam) K0LbZMn,/  
   { :4U0I:J#  
    case VK_MENU: 4'` C1a  
     MaskBits|=ALTBIT; X'jr|s^s  
     break; {-J:4*`  
    case VK_CONTROL: 3hLqAj  
     MaskBits|=CTRLBIT; 72u db^  
     break; v:?o3 S  
    case VK_SHIFT: 9Eu #lV  
     MaskBits|=SHIFTBIT; ]r!QmWw~V  
     break; 6A.P6DW  
    default: //judge the key and send message {79qtq%W{  
     break; Rh[Ibm56  
   } vn``0!FX  
   for(int index=0;index<MAX_KEY;index++){ z$66\/V']  
    if(hCallWnd[index]==NULL) 8nodV 9  
     continue; wW^Zb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  9|<Be6  
    { y)tYSTJK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I.-v?1>,  
     bProcessed=TRUE; 9N^+IZ@l  
    } :SK<2<8h  
   } BD4`eiu"  
  } #%4=)M>^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &lq^dFP&Su  
   for(int index=0;index<MAX_KEY;index++){ + LS3T^  
    if(hCallWnd[index]==NULL) p0Z:Wkz]  
     continue; #>XeR>T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]{Z8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %2}C'MqS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 EDtCNqBS~2  
   } viJJ e'\2  
  } z(rK^RT  
 } l^ Rm0t_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JCNk\@0i*  
} l 1|~  
}I]W'<jY  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: /h7.oD8CU  
P2t_T'R}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mTJ"l(,3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jFG5)t<D  
EavX8r  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: _F^$aZt?e  
@UV{:]f~e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BKX 9 SL]  
{ xG8`'SNY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6< >SHw  
 { *%I[ ke *  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 4~Dax)  
  SaveBmp(); `zY!`G  
  return FALSE; DRp&IP<  
 } gvGi %gq  
 …… //其它处理及默认处理 c_Tzyh7l4  
} d@Q][7  
r ^ Y~mq  
Ok*Z  
  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。 >T QZk4$  
Hit Ac8  
  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。 4#7Umj  
9qre|AA  
  二、编程步骤 +aj^Cs1$  
i5VG2S  
  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"; nEyI t&> 9  
SY|Ez!tU:N  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uOre,AQR  
6"+8M 3M l  
  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; /BT1oWi1y  
!LiQ 1`V{  
  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; -;U3w.-  
EX+,:l\^  
  5、 添加代码,编译运行程序。 gB >pd?d  
H]]c9`ayt  
三、程序代码 fnWsm4  
S/fW/W*/}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL CL1 oAk  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [%?y( q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +sRP<as  
#if _MSC_VER > 1000 `s%QeAde  
#pragma once / gu3@@h  
#endif // _MSC_VER > 1000 'in@9XO  
#ifndef __AFXWIN_H__ hbfsHT  
#error include 'stdafx.h' before including this file for PCH ;_N"Fdl  
#endif :3 y_mf>  
#include "resource.h" // main symbols ?@DNsVwb  
class CHookApp : public CWinApp nj  
{ E(;i>   
 public: ??(Kwtx{  
  CHookApp(); qv uxhzF  
  // Overrides &[~[~m|  
  // ClassWizard generated virtual function overrides # 66e@  
  //{{AFX_VIRTUAL(CHookApp) >XnO&hW  
 public: -njQc:4W,-  
  virtual BOOL InitInstance(); ;ctU&`  
  virtual int ExitInstance(); ;cLUnsB\  
  //}}AFX_VIRTUAL 3~<}bee5|q  
  //{{AFX_MSG(CHookApp) i. M2E$b|  
  // NOTE - the ClassWizard will add and remove member functions here. G0/>8_Q>Nr  
  // DO NOT EDIT what you see in these blocks of generated code ! !oGQ8 e  
  //}}AFX_MSG ?+\E3}:  
  DECLARE_MESSAGE_MAP() ($S Lb6  
}; {*$9,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); i-.c= M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N~| t!G*9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {R8=}Qo  
BOOL InitHotkey(); :Eo8v$W\RB  
BOOL UnInit(); 8gI\zgS  
#endif 5(#-)rlGj  
VMF|iB  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t%$@fjz  
#include "stdafx.h" o\goE^,aeR  
#include "hook.h" 8(Fu  
#include <windowsx.h> f'_M0x  
#ifdef _DEBUG \iga Q\~  
#define new DEBUG_NEW oCuV9dA.  
#undef THIS_FILE Hm4bN\%  
static char THIS_FILE[] = __FILE__; ;RHNRVP  
#endif e "n|jRh  
#define MAX_KEY 100 hDvpOIUL1  
#define CTRLBIT 0x04 Gkmsaf>  
#define ALTBIT 0x02 gl "_:atW  
#define SHIFTBIT 0x01 " '[hr$h3  
#pragma data_seg("shareddata") }dKLMNqPA  
HHOOK hHook =NULL; @ae>b  
UINT nHookCount =0; >{t+4p4k.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l"5y?jT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT u5F}(+4r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (3W&A M  
static int KeyCount =0; j|(:I:]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift v|&s4x?D  
#pragma data_seg() =<.F3lo\s  
HINSTANCE hins; D:m#d.m  
void VerifyWindow(); 4U{m7[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +*.1}r&  
//{{AFX_MSG_MAP(CHookApp) 0Cq!\nzz  
// NOTE - the ClassWizard will add and remove mapping macros here.  d1bhJK  
// DO NOT EDIT what you see in these blocks of generated code! 61|B]ei/  
//}}AFX_MSG_MAP mf2Mx=oy  
END_MESSAGE_MAP() p:tN642  
U|?,N0%Z1  
CHookApp::CHookApp() kFwxK"n@C  
{ L[]BzsIv  
 // TODO: add construction code here, -_|]N/v\  
 // Place all significant initialization in InitInstance oIxH3T  
} x8/us  
O^NP0E  
CHookApp theApp; WK4@:k m6)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \O? u*  
{ -)RJ\V^{9  
 BOOL bProcessed=FALSE; ]]/lC  
 if(HC_ACTION==nCode) zt?H~0$LB  
 { #HG&[Ywi  
  if((lParam&0xc0000000)==0xc0000000){// Key up DqlK.  
   switch(wParam) 2LK]Q/WG,+  
   { ]3+``vL  
    case VK_MENU: o(Kcs-W2  
     MaskBits&=~ALTBIT; 9-93aC.|}  
     break; Ux_<d?p  
    case VK_CONTROL: GX5W^//}  
     MaskBits&=~CTRLBIT; xYwkFB$$*  
     break; `xIh\q  
    case VK_SHIFT: tW(+xu36  
     MaskBits&=~SHIFTBIT; S&01SX6  
     break; `Cg^in\  
    default: //judge the key and send message !tBeuemN%  
     break; r<|nwFJ  
   } ~p.%.b;~t  
   for(int index=0;index<MAX_KEY;index++){ \JU{xQMB  
    if(hCallWnd[index]==NULL) (: OHyeNt  
     continue; N&x:K+Zm .  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v.b5iv5  
    { 0!_*S )  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d$[8w/5Of  
     bProcessed=TRUE; BSDk9Oc  
    } 7E\gxQ(vU  
   } f3t. T=S  
  } B1+ZFQo  
  else if((lParam&0xc000ffff)==1){ //Key down ugxw!cj  
   switch(wParam) m}pL`:e!  
   { f~*K {7  
    case VK_MENU: l5HWZs^  
     MaskBits|=ALTBIT; HlRAD|]\  
     break; oLP]N$'#  
    case VK_CONTROL: ppFYc\&=  
     MaskBits|=CTRLBIT; n ,1tD  
     break; ZqP7@fO_%  
    case VK_SHIFT: #TATqzA  
     MaskBits|=SHIFTBIT; MWhwMj!:m  
     break; 1|/'"9v  
    default: //judge the key and send message Rf:<-C0T  
     break; Pw  xIz  
   } o&,Y<$!:VH  
   for(int index=0;index<MAX_KEY;index++) R9vY:oN%  
   { {XHk6w *-  
    if(hCallWnd[index]==NULL) 8f-:d]  
     continue; Cya5*U0=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3 Ta>Ki  
    { ~},~c:fF?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r{Z[xWIX  
     bProcessed=TRUE; Q"'V9m7 i  
    } zDd5cxFdZ  
   } OHhs y|W  
  } I+~bCcgPi  
  if(!bProcessed){ 9 `INC~h  
   for(int index=0;index<MAX_KEY;index++){ z5pc3:  
    if(hCallWnd[index]==NULL) OAVQ`ek  
     continue; E*^ 9|Y[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !;+U_j'Pg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (H1lqlVWV#  
   } fkG##!  
  } "uhV|Lk*7  
 } h>|u:]I>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h ~fWE  
} r w\D>} \  
{U6"]f%  
BOOL InitHotkey() [ro t  
{ 1I \tu  
 if(hHook!=NULL){ yLB~P7K  
  nHookCount++; `oVB!eapl  
  return TRUE; 48k 7/w\  
 } Uz $ @(C  
 else RJ*F>2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); f8#*mQ  
  if(hHook!=NULL) $`v+4]   
   nHookCount++; :o l6%Z's  
  return (hHook!=NULL); O4N-_Kfp/  
} y7La_FPrl  
BOOL UnInit() Wxs>osq  
{ uOFnCy 4  
 if(nHookCount>1){ ArL-rJ{}  
  nHookCount--; V4EM5 Z\k  
  return TRUE; E\iJP^n  
 } A!4VjE>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5A,=vE  
 if(unhooked==TRUE){ 3`ml; L?D  
  nHookCount=0; 9fMSAB+c%  
  hHook=NULL; .?Auh2nr  
 } Q]T BQ&  
 return unhooked; qg)qjBQwA  
} @`Wt4<  
6W:1>,xS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #!L%J<MX  
{ 6J"(xT  
 BOOL bAdded=FALSE; qPUA!-'  
 for(int index=0;index<MAX_KEY;index++){ x,f>X;04  
  if(hCallWnd[index]==0){ Mlwdha0  
   hCallWnd[index]=hWnd; !3 ?yG  
   HotKey[index]=cKey; +0dT^Jkqg  
   HotKeyMask[index]=cMask; .OV-`TNWj  
   bAdded=TRUE; ,m3":{G:t.  
   KeyCount++; -~} tq]  
   break; D>Ua#<52q  
  } |mvM@V;^8{  
 } UFIjW[h  
 return bAdded; :~i+tD  
} i3d y  
LGfmUb-{]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iU XM( ]  
{ >+SZd7p  
 BOOL bRemoved=FALSE; >"b[r  
 for(int index=0;index<MAX_KEY;index++){ 8(^ ,r#Gy  
  if(hCallWnd[index]==hWnd){ u6pIdt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c(CJ{>F%  
    hCallWnd[index]=NULL; 'mUI-1GkT  
    HotKey[index]=0; 4@mso+tk  
    HotKeyMask[index]=0; /L$NE$D} "  
    bRemoved=TRUE; r*]uR /Z$  
    KeyCount--; _<3r'Y,  
    break; 1EuK, :x  
   } EzUPah  
  } (s ;zRb!4L  
 } 9':/Sab:7v  
 return bRemoved; oAaf)?8  
} ^9s"FdB]24  
E)Srj~$d  
void VerifyWindow() Z>&K&ttJ  
{ 97(n\Wt 2  
 for(int i=0;i<MAX_KEY;i++){ .5N Zf4:C  
  if(hCallWnd!=NULL){ TGtyJ3x\   
   if(!IsWindow(hCallWnd)){ }I)z7l.  
    hCallWnd=NULL; gLV^Z6eE  
    HotKey=0; LjCykk  
    HotKeyMask=0; g&XhQ.aa  
    KeyCount--; [*t U}9  
   } ,.h$&QFj;  
  } 1MpX] j8C#  
 } RRNH0-D1l  
} cT I,1U  
/XN*)m  
BOOL CHookApp::InitInstance() P.!;Uf}32  
{ [{?;c+[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *n,UOHlO  
 hins=AfxGetInstanceHandle(); m qpd  
 InitHotkey(); '/dTqg*W  
 return CWinApp::InitInstance(); ?N(u4atC  
} \DaLHC~  
{vjq y&?y  
int CHookApp::ExitInstance() \3M1.Q4$Gr  
{ D?%e"*>  
 VerifyWindow(); kv/(rKLp*  
 UnInit(); LK{a9` h  
 return CWinApp::ExitInstance(); uFWvtL?;_  
} lR, G;  
YyG~#6aCh  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~ J%m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \ x:_*`fU  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~yd%~|  
#if _MSC_VER > 1000 SK}HXG{?  
#pragma once 2=Jmi?k  
#endif // _MSC_VER > 1000 7f[8ED[4  
z(#=tC|  
class CCaptureDlg : public CDialog [rc'/@L  
{ UJ O]sD`i  
 // Construction 0:s8o@}  
 public: '8L(f w{k  
  BOOL bTray; :C> J-zY  
  BOOL bRegistered; o%$<LaQG5  
  BOOL RegisterHotkey(); =>P_mPP=  
  UCHAR cKey; |HNQ|r_5S  
  UCHAR cMask; p FXd4*  
  void DeleteIcon(); ~T;K-9R  
  void AddIcon(); X4XFu  
  UINT nCount; <nf=SRZ  
  void SaveBmp(); 9DmSs=A  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E*h0#m|)  
  // Dialog Data bU:V%B?=]  
  //{{AFX_DATA(CCaptureDlg) Z"4VH rA  
  enum { IDD = IDD_CAPTURE_DIALOG }; p_A5C?&  
  CComboBox m_Key; 4{g:^?1=  
  BOOL m_bControl; N"&$b_u[  
  BOOL m_bAlt; 8xc8L1;  
  BOOL m_bShift; Hxj'38Y  
  CString m_Path; O\3r%=TF  
  CString m_Number; LR hP7D+A  
  //}}AFX_DATA }rFThI  
  // ClassWizard generated virtual function overrides w/hh 4ir  
  //{{AFX_VIRTUAL(CCaptureDlg) 6vMDm0sv  
 public: Z3Bo@`&?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); (/To?`  
 protected: t*eleNYeS~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O7! fI'R  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =%:JjgKc*t  
  //}}AFX_VIRTUAL t%0r"bTi  
  // Implementation k\Yu5)  
 protected: Qfwwh`;  
  HICON m_hIcon; yLV2>kq  
  // Generated message map functions zojuH8  
  //{{AFX_MSG(CCaptureDlg) |2WxcW]U.%  
  virtual BOOL OnInitDialog(); Q9Q!9B @  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Z3LQl(  
  afx_msg void OnPaint(); c1gz #,  
  afx_msg HCURSOR OnQueryDragIcon(); YK(XS"Kl  
  virtual void OnCancel(); 0F-mROC=F  
  afx_msg void OnAbout(); ViCg|1c  
  afx_msg void OnBrowse(); -lnTYxo+]^  
  afx_msg void OnChange(); A/ox#(!v  
 //}}AFX_MSG 0G+L1a-  
 DECLARE_MESSAGE_MAP() v+|@}9|Z  
}; |`N$>9qN  
#endif ?v0A/68s#  
%ZJ),9+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ';i"?D?NAk  
#include "stdafx.h" \=HfO?$ Ro  
#include "Capture.h" @1/Q  
#include "CaptureDlg.h" $71i+h]_  
#include <windowsx.h> \VoB=Ac&  
#pragma comment(lib,"hook.lib") QwKky ^A  
#ifdef _DEBUG Ah(\%35&  
#define new DEBUG_NEW Ak<IHp^Q  
#undef THIS_FILE dj8F6\  
static char THIS_FILE[] = __FILE__; 48R]\B<R{  
#endif b'1/cY/!  
#define IDM_SHELL WM_USER+1 yffU% )  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?CcR 7l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vHZX9LQU0+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Rfkzv=<"X  
class CAboutDlg : public CDialog TmRrub  
{ 'LtgA|c=  
 public: Ek gZxT_&  
  CAboutDlg(); Pu/-Qpqh  
  // Dialog Data (cPeee%Q  
  //{{AFX_DATA(CAboutDlg) Hsd|ka$x>  
  enum { IDD = IDD_ABOUTBOX }; *l-Dh:  
  //}}AFX_DATA &>+I7Ts]  
  // ClassWizard generated virtual function overrides 6qz!M  
  //{{AFX_VIRTUAL(CAboutDlg) ,f-T1v"  
 protected: #QJ4o_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H]T2$'U6  
  //}}AFX_VIRTUAL R#[QoyJ  
  // Implementation ?15POY ?Z  
 protected: "jkw8UVz  
  //{{AFX_MSG(CAboutDlg) y<IZ|f  
  //}}AFX_MSG i'eYmm96Q  
  DECLARE_MESSAGE_MAP() . }-@;:yh  
}; M]%!n3Fb  
PVQ#>_~5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |j.KFu845  
{ / h 2*$  
 //{{AFX_DATA_INIT(CAboutDlg) 2@=cqD7x  
 //}}AFX_DATA_INIT <;TP@-a  
} ;XKo44%  
pqGf@24c<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c_D,MW\IC  
{ oHc-0$eMKY  
 CDialog::DoDataExchange(pDX); ,=q7}5o Y  
 //{{AFX_DATA_MAP(CAboutDlg) #XYLVee,  
 //}}AFX_DATA_MAP a!hI${Xn  
} =/!{<^0  
 \\E_W9.u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8CN7+V  
 //{{AFX_MSG_MAP(CAboutDlg) V29S*  
 // No message handlers eNlF2M  
 //}}AFX_MSG_MAP J*^,l`C/  
END_MESSAGE_MAP() 4N%2w(,+8  
Z!s>AgH9u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) goBKr: &]w  
: CDialog(CCaptureDlg::IDD, pParent) @+T{M:&l  
{ 2F*Dkv  
 //{{AFX_DATA_INIT(CCaptureDlg) >M8^ Jgh  
  m_bControl = FALSE; 'JW_]z1  
  m_bAlt = FALSE; 3^iQe"P%a@  
  m_bShift = FALSE; l1iF}>F2  
  m_Path = _T("c:\\"); %BKR}  
  m_Number = _T("0 picture captured."); #h #mOJ5  
  nCount=0; #1,>Qnl  
  bRegistered=FALSE; EP*["fx  
  bTray=FALSE; !4b; >y=m  
 //}}AFX_DATA_INIT 7-G'8t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 709Uv5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); t?#vb}_  
} C[87f-g  
Hc_hO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U{za m  
{ `Q(]AG I2  
 CDialog::DoDataExchange(pDX); twJ|Jmd  
 //{{AFX_DATA_MAP(CCaptureDlg) >X\s[d&(  
  DDX_Control(pDX, IDC_KEY, m_Key); [M8qU$&?]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #%=vy\r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); e{rHO,#A>  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8wH41v67F  
  DDX_Text(pDX, IDC_PATH, m_Path); zDGg\cPj9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \4`saM /x  
 //}}AFX_DATA_MAP 8n."5,P  
} Ep,0Z*j  
5LhJ8$W  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x" :Bw;~  
//{{AFX_MSG_MAP(CCaptureDlg) =J[[>H'<d  
 ON_WM_SYSCOMMAND() GqK&'c   
 ON_WM_PAINT() G,mH!lSm,  
 ON_WM_QUERYDRAGICON() ;5JIY7t  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }TAGr 0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )2^/?jK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \aJ-q?=  
//}}AFX_MSG_MAP bTy' 5"  
END_MESSAGE_MAP() @y~BYiKs  
t$PnQ@xu  
BOOL CCaptureDlg::OnInitDialog() ym,Ot1  
{ @D=2Er\  
 CDialog::OnInitDialog(); l)!woOt  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^hYR5SX  
 ASSERT(IDM_ABOUTBOX < 0xF000); YK=#$,6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 65e Wu=T  
 if (pSysMenu != NULL) Ppo^qb  
 { ,ov v  
  CString strAboutMenu; (J;zkb  
  strAboutMenu.LoadString(IDS_ABOUTBOX); g]PLW3  
  if (!strAboutMenu.IsEmpty()) fE7a]R EK  
  { Rcx'a:k  
   pSysMenu->AppendMenu(MF_SEPARATOR); HTtGpTsF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v BeU  
  } C$re$9U  
 } yM#trqv5  
 SetIcon(m_hIcon, TRUE); // Set big icon 5, "^"*@<  
 SetIcon(m_hIcon, FALSE); // Set small icon -z~ V   
 m_Key.SetCurSel(0); y\f8Ird  
 RegisterHotkey(); *a0I  Z  
 CMenu* pMenu=GetSystemMenu(FALSE); >"$-VY6i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c:,{ O 0 #  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); PuoJw~^h  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .T$9Q Ar5  
 return TRUE; // return TRUE unless you set the focus to a control j C1^>D  
} aXid;v,  
*d,n2a#n5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]v,y(yl  
{ ]!Aze^7;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~JmxW;|_x)  
 { OD@A+"  
  CAboutDlg dlgAbout; O@(.ei*HJ!  
  dlgAbout.DoModal(); }${ZI  
 } ALt";8Oa  
 else ~\s &]L  
 { d8q$&(]<  
  CDialog::OnSysCommand(nID, lParam); fjZveH0  
 } zvs 2j"lb  
} wb Tg  
@LMV?  
void CCaptureDlg::OnPaint() !=Vh2UbC3  
{ 9(evHR7  
 if (IsIconic()) qA_DQ):  
 { /:L&uqA  
  CPaintDC dc(this); // device context for painting Kmf-l*7}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WxP4{T* <  
  // Center icon in client rectangle $6?KH7lA  
  int cxIcon = GetSystemMetrics(SM_CXICON); m4.V$U,H]  
  int cyIcon = GetSystemMetrics(SM_CYICON); /s0VyUV=  
  CRect rect; 1sJJ"dC.w  
  GetClientRect(&rect); ?(L? X&)v  
  int x = (rect.Width() - cxIcon + 1) / 2; Dlsa(  
  int y = (rect.Height() - cyIcon + 1) / 2; e$+? v2.  
  // Draw the icon n\)f.}YD8d  
  dc.DrawIcon(x, y, m_hIcon); 1bAp{u&  
 } *oJ>4S  
 else j9fL0$+FI  
 { zs^\z Cb8  
  CDialog::OnPaint(); 8lb `   
 } u H;^>`DT  
} s?I=}  
KUn5S&eB  
HCURSOR CCaptureDlg::OnQueryDragIcon() "dU#j,B2  
{ 8o5^H>  
 return (HCURSOR) m_hIcon; c+M@{EbuN  
} J0)WRn"h  
S gsR;)2  
void CCaptureDlg::OnCancel() =,;3z/k%  
{ `2~Ea_Z  
 if(bTray) ]CJ>iS!V  
  DeleteIcon(); (%IstR|u:  
  CDialog::OnCancel(); H.S|njn:r  
} Oes+na'^  
N P(?[W  
void CCaptureDlg::OnAbout() }z 2-|"H  
{ [eik<1=,~?  
 CAboutDlg dlg; V1V4 <Zj  
 dlg.DoModal(); rpI7W?hh  
} U`4Z j1y  
IHMyP~{  
void CCaptureDlg::OnBrowse()  2x J5  
{ >\Pj(,'  
 CString str; ]6 7wk  
 BROWSEINFO bi; lMf5F8  
 char name[MAX_PATH]; DL Q`<aU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }XE/5S}D  
 bi.hwndOwner=GetSafeHwnd(); {8Nd-WJ{  
 bi.pszDisplayName=name; lGgKzi9VD  
 bi.lpszTitle="Select folder"; c{P`oB8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; W n mRRq^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qq{N; C  
 if(idl==NULL) qk"=nAJX  
  return; jJnBwHp  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i58CA?  
 str.ReleaseBuffer(); Yx/~8K_%M?  
 m_Path=str; .`=PE&xq  
 if(str.GetAt(str.GetLength()-1)!='\\') JEkVj']?  
  m_Path+="\\"; 9r*T3=u.S  
 UpdateData(FALSE); D[y|y 3F  
} 3&2q\]Y,  
P@? '@.e  
void CCaptureDlg::SaveBmp() } dlNMW  
{ tzN;;h4C  
 CDC dc; 6$.Xj\zl  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); };sm8P{M  
 CBitmap bm; Nr+1N83S}  
 int Width=GetSystemMetrics(SM_CXSCREEN); |*a>6y  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^%@.Vvz<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fJV VW  
 CDC tdc; {vlh ,0~  
 tdc.CreateCompatibleDC(&dc); Oz7v hOU  
 CBitmap*pOld=tdc.SelectObject(&bm); :!\./z8v  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'gH#\he[Dh  
 tdc.SelectObject(pOld); $B/cj^3  
 BITMAP btm; e28#Yh@U  
 bm.GetBitmap(&btm); uV:;y}T^Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; p7tC~]r:L  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D:,<9%A  
 BITMAPINFOHEADER bih; j!H?dnE||  
 bih.biBitCount=btm.bmBitsPixel; 6&T1 ZY`  
 bih.biClrImportant=0; #XPU$=  
 bih.biClrUsed=0; #| Po&yu4R  
 bih.biCompression=0; +rX,Sl`/  
 bih.biHeight=btm.bmHeight; U#4W"1~iX  
 bih.biPlanes=1; %;J`dM  
 bih.biSize=sizeof(BITMAPINFOHEADER); DF =. G1  
 bih.biSizeImage=size; wQ.zj`?$(  
 bih.biWidth=btm.bmWidth; xI8*sTx 6  
 bih.biXPelsPerMeter=0; )Me&xQTn  
 bih.biYPelsPerMeter=0; XITQB|C??$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ITiw) M  
 static int filecount=0; t,6=EK*3T  
 CString name; 0w]?yqnE  
 name.Format("pict%04d.bmp",filecount++); B!anY}/U  
 name=m_Path+name; 2kve?/  
 BITMAPFILEHEADER bfh; \59hW%Di  
 bfh.bfReserved1=bfh.bfReserved2=0; u] b6>  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;_ton?bF  
 bfh.bfSize=54+size; _v,n~a}&  
 bfh.bfOffBits=54; g5[3[Z(.  
 CFile bf; lU& IS?^?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ iiscm\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DdgFBO  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h]$zub  
  bf.WriteHuge(lpData,size); &y+eE?j  
  bf.Close(); p04w 83 jX  
  nCount++; V5 w^Le_^  
 } R4;6Oi)  
 GlobalFreePtr(lpData); lHXH03  
 if(nCount==1) zYsGI<4  
  m_Number.Format("%d picture captured.",nCount); q[ZYlF,Ho  
 else }J`Gm  
  m_Number.Format("%d pictures captured.",nCount); j!rz@Y3  
  UpdateData(FALSE); )-oNy-YL  
} Sm5"Q  
ZAwl,N){  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w@We,FUJN  
{ j!dklQh0  
 if(pMsg -> message == WM_KEYDOWN) \ZH=$c*W  
 { ,s K-gw  
  if(pMsg -> wParam == VK_ESCAPE) }S4Fy3)  
   return TRUE; c,^-nH'X>  
  if(pMsg -> wParam == VK_RETURN) @<L.#gtP  
   return TRUE; CqV \:50g  
 } P/ 5r(l5  
 return CDialog::PreTranslateMessage(pMsg); E~ kmU{D  
} G y2XjO8b  
|99eDgK,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WYL.J5O  
{ Jt"Wtr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ XJ+sm^`vOf  
  SaveBmp(); 9q?gmAn.  
  return FALSE; }$ der  
} 7=9jXNk Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]g :ZokU  
 CMenu pop; uwJkqlUOz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1+'3{m \5T  
 CMenu*pMenu=pop.GetSubMenu(0); +zvK/Fj2q  
 pMenu->SetDefaultItem(ID_EXITICON); z,WrLZC  
 CPoint pt; paY%pU  
 GetCursorPos(&pt); @z.!Dby  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); t{9Ph]e  
 if(id==ID_EXITICON) JYq} YG=%  
  DeleteIcon(); s0CRrMk  
 else if(id==ID_EXIT) .755-S  
  OnCancel(); M=%p$\x  
 return FALSE; 6._):[_2  
} R.@GLx_zpQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l_WY];a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [B Al  
 AddIcon(); u CXd% CzE  
 return res; :>=,sLfJ  
}  NNX/2  
53A=O gk8S  
void CCaptureDlg::AddIcon() (,>`\\  
{ bc-"If Z&  
 NOTIFYICONDATA data; _" n4SXhq  
 data.cbSize=sizeof(NOTIFYICONDATA); |Cm}%sgR\0  
 CString tip; (@zn[ Nq  
 tip.LoadString(IDS_ICONTIP); TocqoYX{{  
 data.hIcon=GetIcon(0); 5"+* c@L  
 data.hWnd=GetSafeHwnd(); a%kj)ah  
 strcpy(data.szTip,tip); !jm a --  
 data.uCallbackMessage=IDM_SHELL; G>b1No3%k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8}&cE#@  
 data.uID=98; eF9LZ"-s  
 Shell_NotifyIcon(NIM_ADD,&data); `#hy'S:e  
 ShowWindow(SW_HIDE); 2mRso.Ah  
 bTray=TRUE; B(~D*H2T[  
} 9I9)5`d|Jn  
.|K5b]na  
void CCaptureDlg::DeleteIcon() \hz)oC   
{ U1Oq"Ij~  
 NOTIFYICONDATA data; |kn}iA@72p  
 data.cbSize=sizeof(NOTIFYICONDATA); f' eKX7R  
 data.hWnd=GetSafeHwnd(); 1{*x+GC^/  
 data.uID=98; _Uq'eZol  
 Shell_NotifyIcon(NIM_DELETE,&data); R9HRbVBJf  
 ShowWindow(SW_SHOW); pP .   
 SetForegroundWindow(); -M4#dHR_!  
 ShowWindow(SW_SHOWNORMAL); E ?-K_p  
 bTray=FALSE; :?,& u,8  
} A /MOY@%G  
tU(6%zvR  
void CCaptureDlg::OnChange() @U}UCG7+  
{ ny}?+&K  
 RegisterHotkey(); \l`;]cA  
} +CACs7tV  
,i}"e(f  
BOOL CCaptureDlg::RegisterHotkey() Y9Pb  
{ tC;D4i  
 UpdateData(); |D\ ukml  
 UCHAR mask=0; ,?}TSJKC  
 UCHAR key=0; :c\NBKHv*  
 if(m_bControl) ',.Xn`c  
  mask|=4; `bi5#xR  
 if(m_bAlt) GRNH!:e  
  mask|=2; yfU1;MI  
 if(m_bShift) |1neCP@ng  
  mask|=1; E^  rN)  
  key=Key_Table[m_Key.GetCurSel()]; z w0p}  
 if(bRegistered){ ka(xU#;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3cnsJV]  
  bRegistered=FALSE; Y{jhT^tKK  
 } D=8=wT2 <  
 cMask=mask; @8 pRIS"V  
 cKey=key; N7NK1<vw2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zd}"8  
 return bRegistered; (Lc%G~{  
} i}Y:o}  
u`ZnxD>  
  四、小结 =Vi+wH{xM  
, vR4x:W  
  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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