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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: hi!`9k  
  .;9jdGBf  
  一、实现方法 {V}qwm?  
W;4Lkk$  
  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: Ejv%,q/T(  
xOythvO  
#pragma data_seg("shareddata") {3LA%xO  
HHOOK hHook =NULL; //钩子句柄 #b'N}2'p#V  
UINT nHookCount =0; //挂接的程序数目 Wbe0ZnM]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z Ct\o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ld.7`)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey joqWh!kv7U  
static int KeyCount =0; uMvb-8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D?^Y`G$.  
#pragma data_seg() (ew} gJ  
b^x07lO  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Y&K <{\vE  
@xS]!1-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: [F+,YV%t  
:$?Q D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR w d/G|kNO  
cKey,UCHAR cMask) 3Hw[s0[$  
{ WWNu:,  
 BOOL bAdded=FALSE; mk%b9Ko<F  
 for(int index=0;index<MAX_KEY;index++){ PnA?+u2m  
  if(hCallWnd[index]==0){ =s;M]:  
   hCallWnd[index]=hWnd; 7NJFWz!  
   HotKey[index]=cKey; wO7t!35  
   HotKeyMask[index]=cMask; 4/'N|c.  
   bAdded=TRUE; XV>@B $hu  
   KeyCount++; 'Dath>Y=  
   break; }$&xTW_  
  } D<bI2  
 } G(/DtY]  
 return bAdded; %?9Ok  
} T/l1qcf`wT  
//删除热键 Lg4YED9#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v*z(@<Y  
{ {:bN/zV#  
 BOOL bRemoved=FALSE; )#C mQXgG  
 for(int index=0;index<MAX_KEY;index++){ qM",( Bh  
  if(hCallWnd[index]==hWnd){ jAC78n,Fi@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z(e ^iH  
    hCallWnd[index]=NULL; ~}'F887f  
    HotKey[index]=0; X:EEPGE  
    HotKeyMask[index]=0; D//=m=  
    bRemoved=TRUE; HbM0TXo  
    KeyCount--; Mzkkc QLK  
    break; M:n6BC>t"  
   } I[d]!YI}F  
  } 2'|8Q\,:4Z  
 } QA?oJ_}y  
 return bRemoved; fDh] tua  
} eKG2*CV  
/Vww?9U;  
=:=/Gz1  
  DLL中的钩子函数如下: `s"d]/85VW  
MsOs{2 )2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w5,Mb  
{ [sy j#  
 BOOL bProcessed=FALSE; hH>``gK  
 if(HC_ACTION==nCode) G$bJ+  
 { 2eb1 lJdS  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ZVih=Y-w  
   switch(wParam) 5l{Ts04k%  
   {  Q@S-f:!  
    case VK_MENU: eE(b4RCM  
     MaskBits&=~ALTBIT; cn`iX(ZgR  
     break; t;NV $!!  
    case VK_CONTROL: ny*i+4Mb  
     MaskBits&=~CTRLBIT; O.QK"pKD\  
     break; FX}Gt=  
    case VK_SHIFT: ezm&]F`  
     MaskBits&=~SHIFTBIT; 5,)vJ,fs  
     break; (xpn`NA  
    default: //judge the key and send message 4aUiXyr*2  
     break; = QO g 6  
   } 5(m(xo6  
   for(int index=0;index<MAX_KEY;index++){ "ju'UOcS/  
    if(hCallWnd[index]==NULL) iE].&>w  
     continue; w@-M{?R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6.WceWBR  
    { eWs&J24  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;i<jhNA  
     bProcessed=TRUE; }G V X>p  
    } 3gEMRy*+  
   } i^msjA  
  } u=x+ J=AH  
  else if((lParam&0xc000ffff)==1){ //有键按下 YJV%a  
   switch(wParam) T{v>-xBRy  
   { a_~=#]a  
    case VK_MENU: 6%G-Vs]*2  
     MaskBits|=ALTBIT; h^UKT`9vt  
     break; Q\ppfc{,  
    case VK_CONTROL: Y f@e=:  
     MaskBits|=CTRLBIT; zP\7S}p7%  
     break; )!:sFa 1  
    case VK_SHIFT: zi9[)YqxPH  
     MaskBits|=SHIFTBIT; NPa\Cg[  
     break; co8"sz0(U  
    default: //judge the key and send message SRIA*M.B}  
     break; ypOLp SYk  
   } kYzKU2T\W  
   for(int index=0;index<MAX_KEY;index++){ "Jq8?FoT  
    if(hCallWnd[index]==NULL) (V`Md\NL`  
     continue; i%m"@7.kk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `F YjQ e"p  
    { =@&cHY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s$ENFp7P  
     bProcessed=TRUE; AlE8Xu9UB  
    } b?X.U}62_  
   } FY{e2~gi  
  } RGKYW>$0RR  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 a8k;(/  
   for(int index=0;index<MAX_KEY;index++){ nn/?fIZN4  
    if(hCallWnd[index]==NULL) yZr M.%V  
     continue; 9I27TKy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sV"UI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i<kD  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 q;g>t5]a  
   } ^hNgm.I  
  } Z;Ez"t&U  
 } V&8Vw F^-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); klg25#t  
} gxz-R?.  
!U9|x\BqJ2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: h,aAw#NE*  
ryF7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  McH>"`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y&}E~5O  
A1'hlAGF  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ?Nf>]|K:Q  
"Ve.cP,7(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MFTk qbc  
{ zJP6F.Ov!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X[`bMa7IB(  
 { b2aF 'y/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 EVp,Q"V]  
  SaveBmp(); `>0MNmu  
  return FALSE; B`*ZsS=R-  
 } p&+;w  
 …… //其它处理及默认处理 5^']+5_vb  
} *.L81er5~  
eSWL rryY  
/|#&px)G  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 7+X:LA~U  
d ;vT ~;  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 W;bu2ym&Q  
3)-/`iy#  
  二、编程步骤 j83p)ido  
u6>?AW1~  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; G!K]W:m  
l @^3Exwt  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )* 4fzo  
dJT]/g  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; |D, +P  
@d Jr/6Yx  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; a=M\MZK>  
;"(foY"L  
  5、 添加代码,编译运行程序。 Wu4Lxv]B4  
I%- " |]$  
三、程序代码 j'9"cE5_  
K>*a*[t0Sy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 7AYd!n&S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0-~\ W(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X]\ \,  
#if _MSC_VER > 1000 :_!8 WB  
#pragma once N<QXmgqx  
#endif // _MSC_VER > 1000 c478P=g=5  
#ifndef __AFXWIN_H__ Yjx|9_|Xn  
#error include 'stdafx.h' before including this file for PCH v) vkn/:  
#endif h/~n\0,J/  
#include "resource.h" // main symbols N[kwO1  
class CHookApp : public CWinApp iD<(b`S  
{ 3p0LN'q]A  
 public: %Gt .m  
  CHookApp(); J,Ks0M A  
  // Overrides =[F<7pvE  
  // ClassWizard generated virtual function overrides d&Ef"H  
  //{{AFX_VIRTUAL(CHookApp) \ Y"Wu  
 public: 2WU@*%sk"  
  virtual BOOL InitInstance(); =Zi2jL?On  
  virtual int ExitInstance(); Z!hafhcX  
  //}}AFX_VIRTUAL um9_ru~  
  //{{AFX_MSG(CHookApp) R {-5Etv  
  // NOTE - the ClassWizard will add and remove member functions here. {&"N%;`Q  
  // DO NOT EDIT what you see in these blocks of generated code ! kF/9-[]$g,  
  //}}AFX_MSG rETRTp0HT  
  DECLARE_MESSAGE_MAP() cJ54s}  
}; #dM9pc jh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P2bZ65>3y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $@UN4B?y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aH^RoG}  
BOOL InitHotkey(); &^W|iXi#  
BOOL UnInit(); I1PuHf Qs  
#endif =}.EY iD  
Dk?\)lD`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4'0Dr++  
#include "stdafx.h" _cXqAo  
#include "hook.h" } \ZaE~  
#include <windowsx.h> ]CoeSA`j  
#ifdef _DEBUG &L^+BQ`O?  
#define new DEBUG_NEW 9uGrk^<t  
#undef THIS_FILE qAw x2fPu  
static char THIS_FILE[] = __FILE__; fFc/ d(  
#endif Uw 47LP  
#define MAX_KEY 100 St e=&^  
#define CTRLBIT 0x04 )E~ 79!  
#define ALTBIT 0x02 rwGKfoKI  
#define SHIFTBIT 0x01 ,T2G~^0  
#pragma data_seg("shareddata") s0PrbL%_`  
HHOOK hHook =NULL; ^Vpq$'!  
UINT nHookCount =0; gvL f|+m  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey nw-I|PVTNa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  ]C) 4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?mwD*LN3o  
static int KeyCount =0; )b:7-}d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z l*X?5u  
#pragma data_seg() KQ~i<1&j  
HINSTANCE hins; 7AObC4 g  
void VerifyWindow(); mya_4I m  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SLh(9%S;  
//{{AFX_MSG_MAP(CHookApp) /kfgx{jZ  
// NOTE - the ClassWizard will add and remove mapping macros here. ['T:ea6B  
// DO NOT EDIT what you see in these blocks of generated code! ;aw=MV  
//}}AFX_MSG_MAP _'(,  
END_MESSAGE_MAP() uuQ(&  
o93`|yWl  
CHookApp::CHookApp() 0zi~p>*nJC  
{ $C `;fA  
 // TODO: add construction code here, Z4lO?S5%J  
 // Place all significant initialization in InitInstance YGrg  
} ;72T|e  
gXjV?"^kUl  
CHookApp theApp; <kCU@SK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3? HhG  
{ UX dUO@  
 BOOL bProcessed=FALSE; h@[R6G|  
 if(HC_ACTION==nCode) R00eisd  
 { kO}AxeQ  
  if((lParam&0xc0000000)==0xc0000000){// Key up .,OVzW  
   switch(wParam) sD=n95`v  
   { h-%R<[  
    case VK_MENU: nX=$EQiH  
     MaskBits&=~ALTBIT; t]YC"%[S  
     break; 0|a(]a}V*j  
    case VK_CONTROL: v-PXZ'7~  
     MaskBits&=~CTRLBIT; {|'E  
     break; ~/P&Tub^  
    case VK_SHIFT: \ioH\9  
     MaskBits&=~SHIFTBIT; {j7uv"|X7  
     break; ^pYxKU_O  
    default: //judge the key and send message 4y+< dw  
     break; yr lf+tl  
   } Y 1t\iU  
   for(int index=0;index<MAX_KEY;index++){ 'hs2RSq  
    if(hCallWnd[index]==NULL) @w?P7P<O`  
     continue; 2* 2wY=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }yz (xH  
    { *3?'4"B{8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Dp':oJC  
     bProcessed=TRUE; 2n|K5FR()  
    } 3J5!oF{H  
   } 'JRvP!]  
  } 2'W<h)m)z  
  else if((lParam&0xc000ffff)==1){ //Key down >Vwc3d  
   switch(wParam) k<" oiCE  
   { aP/T<QZ~  
    case VK_MENU: rsy'q(N[  
     MaskBits|=ALTBIT; hUF5fZqii  
     break; ~FN9 [aJF+  
    case VK_CONTROL: ,.7*Hpa  
     MaskBits|=CTRLBIT; lb3]$Da  
     break; LS917ci-  
    case VK_SHIFT: -&-Ma,M?  
     MaskBits|=SHIFTBIT; +>r/0b  
     break; c\Q7"!e  
    default: //judge the key and send message SF>c\eTtx  
     break; c5u@pvSP  
   } ?]}8o}G  
   for(int index=0;index<MAX_KEY;index++) CL+}| 7O(  
   { #N`~xZ|$  
    if(hCallWnd[index]==NULL) =_:et 0  
     continue; d%o&+l#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <kx&w(=  
    { tV{ 4"Ij9[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6 BCf:mqP  
     bProcessed=TRUE; O R;uqV@  
    } o}* hY"&  
   } 3G(miP6  
  } %y@Hh=  
  if(!bProcessed){ 50o~ P!Lz|  
   for(int index=0;index<MAX_KEY;index++){ <psZQdH  
    if(hCallWnd[index]==NULL) x;8A!8w  
     continue; AD|2q M))  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ce7CcHQ?B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Yo|,]X>/  
   } w.\&9]P3~  
  } ~,i-8jl,  
 } 1q,{0s_kp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 23DiW#o'  
} (aH'h1,G  
9R7 A8  
BOOL InitHotkey() z}MP)|aH:  
{ n:{qC{D-qS  
 if(hHook!=NULL){ 'coV^~qy  
  nHookCount++; ;,?KI$K  
  return TRUE; t},/}b  
 } _t^{a]/H  
 else j4cwI90=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &2{ tF  
  if(hHook!=NULL) 0sfr d  
   nHookCount++;  ~Hr}]  
  return (hHook!=NULL); *q-['"f  
} ' <@3i[M  
BOOL UnInit() SUU !7Yd|  
{ Z|lq b=  
 if(nHookCount>1){ |bO"_U  
  nHookCount--; f)^_|8  
  return TRUE; ~wkj&yVT  
 } Ljp%CI[i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); % a@>_  
 if(unhooked==TRUE){ w%JTTru  
  nHookCount=0; e,Uo#T6J  
  hHook=NULL; =5(>q5Z*  
 } $w);5o  
 return unhooked; yFtd=AI'E  
} %nV]ibp2)  
`Ch9~*p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q+W1lv8R  
{ LC'{p  
 BOOL bAdded=FALSE; q)^Jj ?W  
 for(int index=0;index<MAX_KEY;index++){ A m>cd;  
  if(hCallWnd[index]==0){ Fd[zDz  
   hCallWnd[index]=hWnd; jhb6T ?}  
   HotKey[index]=cKey; 3%(N[&LU  
   HotKeyMask[index]=cMask; id2j7|$,  
   bAdded=TRUE; F7O(Cy"1  
   KeyCount++; i5CK*"$Q  
   break; Nw1#M%/!r!  
  } A^y|J ` k|  
 } }wHW7SJ  
 return bAdded; 6{^E{go  
} Is{KN!Hw  
5*,f Fib  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9 mmCp&~Z  
{ LQngK7>  
 BOOL bRemoved=FALSE; 8q,6}mV  
 for(int index=0;index<MAX_KEY;index++){ <c qbUL  
  if(hCallWnd[index]==hWnd){ A*}.EClH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `CgaS#  
    hCallWnd[index]=NULL; P dhEQ}H  
    HotKey[index]=0; n8".XS  
    HotKeyMask[index]=0; >VN5`Zlw\C  
    bRemoved=TRUE; '>' wK.  
    KeyCount--; NqDHCI  
    break; 9.a3&*tV[  
   } #]ypHVE  
  } :n.f_v}6  
 } j]aoR  
 return bRemoved; :uK? 4  
} RIY,K*f.  
enSXP~9w  
void VerifyWindow() Z(ACc9k6:'  
{ `O[};3O&  
 for(int i=0;i<MAX_KEY;i++){ =1Oj*x@*4  
  if(hCallWnd!=NULL){ Ns7(j-  
   if(!IsWindow(hCallWnd)){ Q2F+?w;,  
    hCallWnd=NULL; &iA?+kV  
    HotKey=0; ~s]iy9i  
    HotKeyMask=0; 8p@Piy{p  
    KeyCount--; [g:$K5\64  
   } /M3Y~l$  
  } /qy-qUh3h  
 } pJt,9e6  
} JSTuXW  
O"c;|zCc>  
BOOL CHookApp::InitInstance() EB2!HpuQ3  
{ -wSg2'b4E  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1>E<8&2[L  
 hins=AfxGetInstanceHandle(); ZRg;/sX]  
 InitHotkey(); SVB\  
 return CWinApp::InitInstance(); ~,5gUl?Il  
} oIb|*gX^  
Vc2A  
int CHookApp::ExitInstance() n 3D;"a3  
{ d [V;&U  
 VerifyWindow(); o8-^cP1  
 UnInit(); LS88.w\=S@  
 return CWinApp::ExitInstance(); 8$;=Uf,x  
} ]2\VweV  
_PlKhv}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )Ccq4i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pXtXjb  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j{9D{  
#if _MSC_VER > 1000 nAjO6g6E  
#pragma once 2|}+T6_q  
#endif // _MSC_VER > 1000 Q^e}?v%=%3  
Y<Fz)dQo  
class CCaptureDlg : public CDialog {O`w,dMOI  
{ '4|-9M3f  
 // Construction }9W4"e2)  
 public: #R.-KUW:  
  BOOL bTray; p%R  
  BOOL bRegistered; @)4]b+8Z  
  BOOL RegisterHotkey(); $}jssnoU  
  UCHAR cKey; p~,]*y:XT  
  UCHAR cMask; kAC&S!n  
  void DeleteIcon(); +i2}/s@JJ  
  void AddIcon(); @>)r}b  
  UINT nCount; yX0dbW~@y  
  void SaveBmp(); P:aJ#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "t_-f7fS7  
  // Dialog Data R]btAu;Z  
  //{{AFX_DATA(CCaptureDlg) a8 mVFm  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?`#/ 8PN  
  CComboBox m_Key; ,}))u0q+:  
  BOOL m_bControl; iMP]W _  
  BOOL m_bAlt; nw<&3k(g}  
  BOOL m_bShift; <RG|Dx[:=  
  CString m_Path; DFd%9*N  
  CString m_Number; NF0%}II&xK  
  //}}AFX_DATA o)2W`i&  
  // ClassWizard generated virtual function overrides  )8UWhl=  
  //{{AFX_VIRTUAL(CCaptureDlg) AbYqf%~7`l  
 public: .On|uC)!  
  virtual BOOL PreTranslateMessage(MSG* pMsg); t{WzKy  
 protected: O2BDL1o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LM-J !44  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *]VFvh  
  //}}AFX_VIRTUAL bdibaN-h  
  // Implementation CCWg{*og  
 protected: n_(/JE>  
  HICON m_hIcon; PX n;C/  
  // Generated message map functions AG?dGj^  
  //{{AFX_MSG(CCaptureDlg) y1bbILWej  
  virtual BOOL OnInitDialog(); $a"n1ou  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h}cy D7Wn  
  afx_msg void OnPaint(); N 0= ac5  
  afx_msg HCURSOR OnQueryDragIcon(); ?hWwj6i&  
  virtual void OnCancel(); 9=V:&.L  
  afx_msg void OnAbout(); HOE_S!N  
  afx_msg void OnBrowse(); a8i]]1Blz  
  afx_msg void OnChange(); W034N[9  
 //}}AFX_MSG |<.lW  
 DECLARE_MESSAGE_MAP() +{W>i;U  
}; Ie`13 L2  
#endif X90J!  
PV/7 7{'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \a6^LD}B  
#include "stdafx.h" Z]j*9#G1s  
#include "Capture.h" .72S oT  
#include "CaptureDlg.h" sh`s /JRf  
#include <windowsx.h> \e'R @  
#pragma comment(lib,"hook.lib") :SGF45>B@  
#ifdef _DEBUG I S#FiH  
#define new DEBUG_NEW zOqn<Y@  
#undef THIS_FILE !>e5z|1   
static char THIS_FILE[] = __FILE__; }c`fW&  
#endif _;~,Cgfi  
#define IDM_SHELL WM_USER+1 I]&#Dl/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); we;G]`@?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wm$}Pch  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1I<rXY(a`  
class CAboutDlg : public CDialog {6c2{@  
{ r!HwXeEn/  
 public: JoN\]JL\,  
  CAboutDlg(); -xDGH  
  // Dialog Data L.2/*H#  
  //{{AFX_DATA(CAboutDlg) QzzW x2  
  enum { IDD = IDD_ABOUTBOX }; " 9^j.  
  //}}AFX_DATA )6Ny1x+  
  // ClassWizard generated virtual function overrides 00SbH$SU  
  //{{AFX_VIRTUAL(CAboutDlg) :)_~w4&  
 protected: l*kPOyB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zuw?58RE\  
  //}}AFX_VIRTUAL A Q+]|XYo_  
  // Implementation _-9@qe  
 protected: ?}RSwl  
  //{{AFX_MSG(CAboutDlg) 6C]1Q.f;  
  //}}AFX_MSG u9}1)9  
  DECLARE_MESSAGE_MAP() B]Y}Hu  
}; j^;I3_P  
jGEt+\"/QJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D!.+Y-+Xzu  
{ P~G1EK|4  
 //{{AFX_DATA_INIT(CAboutDlg) ;z IP,PMM  
 //}}AFX_DATA_INIT spGB)k,^  
} |/2y-[;:  
yI ld75S`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eXK o.JL  
{ B|4X}*@SX  
 CDialog::DoDataExchange(pDX); hlJq-*6'  
 //{{AFX_DATA_MAP(CAboutDlg) PB/IFsJ  
 //}}AFX_DATA_MAP Qum9A   
} :L1dyVA{  
HVP"A3}KC  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) BvR-K\rx  
 //{{AFX_MSG_MAP(CAboutDlg) 91q8k=p  
 // No message handlers /qx0TDB  
 //}}AFX_MSG_MAP n%k!vJ)]  
END_MESSAGE_MAP() %c [F;ug  
BwBm[jtP  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YQpSlCCo 3  
: CDialog(CCaptureDlg::IDD, pParent) h~p>re  
{ o4%y>d)  
 //{{AFX_DATA_INIT(CCaptureDlg) g"?Y+j  
  m_bControl = FALSE; 59%tXiO  
  m_bAlt = FALSE; wmTq` XH)  
  m_bShift = FALSE; l"!Ko G7  
  m_Path = _T("c:\\"); p8\zG|b5  
  m_Number = _T("0 picture captured."); PC[c/CoD  
  nCount=0; B';6r4I-  
  bRegistered=FALSE; XP1~d>j  
  bTray=FALSE; XvE9 b5}  
 //}}AFX_DATA_INIT ooV3gj4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rN%F) q#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7hi"6,  
} aS pWsT  
#F*1V(!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,daKC  
{ ^~$)F_`"  
 CDialog::DoDataExchange(pDX); ']>Mp#j  
 //{{AFX_DATA_MAP(CCaptureDlg) E6,4RuCK  
  DDX_Control(pDX, IDC_KEY, m_Key); Z0*ljT5|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  wAz&"rS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); qR8u$2}NY  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); +{/*z  
  DDX_Text(pDX, IDC_PATH, m_Path); K\$J4~EtG  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ma\Gb+>  
 //}}AFX_DATA_MAP Tzn tO9P+  
} 0%Z]h?EYy|  
y /BJIQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xritonG/F  
//{{AFX_MSG_MAP(CCaptureDlg) #~=hn8  
 ON_WM_SYSCOMMAND() <]T`3W9  
 ON_WM_PAINT() qKE:3g35  
 ON_WM_QUERYDRAGICON() 9!Ar`Io2@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) \MmI`$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w 1Ec_y{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +8#_59;x  
//}}AFX_MSG_MAP -CR?<A4mud  
END_MESSAGE_MAP() 2l F>1vH  
2Y>~k{AN%  
BOOL CCaptureDlg::OnInitDialog() $YXMI",tt<  
{ 7 As|Ns`  
 CDialog::OnInitDialog(); v9D22,K-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x&`~R>5/  
 ASSERT(IDM_ABOUTBOX < 0xF000); Da v PYg  
 CMenu* pSysMenu = GetSystemMenu(FALSE); d5>H3D{49  
 if (pSysMenu != NULL) (C\hVy2X?N  
 { jC3Vbm&ZZ  
  CString strAboutMenu; P{5-Mx!{&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6}(J6T46M[  
  if (!strAboutMenu.IsEmpty()) p<&Xd}]"^W  
  { @0eHS +  
   pSysMenu->AppendMenu(MF_SEPARATOR); <N`J`J-[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #_|sgS?1  
  } K3' niGT  
 } p?2Y }9  
 SetIcon(m_hIcon, TRUE); // Set big icon d~?X/sJ t  
 SetIcon(m_hIcon, FALSE); // Set small icon (s1k$@d  
 m_Key.SetCurSel(0); Z{ u a=0  
 RegisterHotkey(); $F/EJ>  
 CMenu* pMenu=GetSystemMenu(FALSE); [tH-D$V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); A 5+rd{k/  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8UMF q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *5wu   
 return TRUE; // return TRUE unless you set the focus to a control hx f'5uc  
} A#W?2k9  
g1UGd  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) UDe |Sb  
{ Bcjx>#3?L  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `xc^_781\  
 { .iQT5c  
  CAboutDlg dlgAbout; -\y-qHgb/  
  dlgAbout.DoModal(); 'Vr$MaO  
 } o d7]tOK9  
 else xESjM1A)  
 { _6k*'aT~FK  
  CDialog::OnSysCommand(nID, lParam); 2~*Ez!.3  
 } X<MO7I  
} c=[O `/f  
O$g_@B0E1  
void CCaptureDlg::OnPaint() ZKz,|+X0G  
{ Cv*x2KF G  
 if (IsIconic()) 2iU7 0(H  
 { cNKUu~C+  
  CPaintDC dc(this); // device context for painting Y9=(zOqv  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6MG9a>=  
  // Center icon in client rectangle {0@& OO:w  
  int cxIcon = GetSystemMetrics(SM_CXICON); y')RT R{>M  
  int cyIcon = GetSystemMetrics(SM_CYICON); k;EPpr-{  
  CRect rect; c.|l-zAeX  
  GetClientRect(&rect); 1TM~*<Jb  
  int x = (rect.Width() - cxIcon + 1) / 2; teW6;O_  
  int y = (rect.Height() - cyIcon + 1) / 2; )%X;^(zKM  
  // Draw the icon #$1og=  
  dc.DrawIcon(x, y, m_hIcon); IF +i3#$  
 } 6ATtW+sN]  
 else Ox#Q2W@Uy  
 { KT.?Xp:z  
  CDialog::OnPaint(); ]=EM@  
 } 7 JDN{!jT  
} ]O` {dnP  
{&[9iIf  
HCURSOR CCaptureDlg::OnQueryDragIcon() j.i#*tN//  
{ BT_tOEL#  
 return (HCURSOR) m_hIcon; : 5U"XY x@  
} PU {uE[  
1 Vy,&[c~"  
void CCaptureDlg::OnCancel() &5%dhc4&!&  
{ cDrebU  
 if(bTray) npDIX  
  DeleteIcon(); @-)tM.8~  
  CDialog::OnCancel(); #RMI&[M  
} 2`a q**}  
SMf+qiM-E  
void CCaptureDlg::OnAbout() F=)&98^v$_  
{ j+8TlVur  
 CAboutDlg dlg; :+%Zh@u\  
 dlg.DoModal(); D%7kBfCb  
} Kv{8iAB#c  
}4>JO""  
void CCaptureDlg::OnBrowse() WV"jH9"[  
{ 6] z}#"  
 CString str; )B!d,HKt;  
 BROWSEINFO bi; kJ(A,s|  
 char name[MAX_PATH]; *zWWmxcJa  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8z<r.joxC  
 bi.hwndOwner=GetSafeHwnd(); DXQi-+?  
 bi.pszDisplayName=name; gLL\F1|0x  
 bi.lpszTitle="Select folder"; nPkZHIxuD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &*&?0ov^"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .1QgK  
 if(idl==NULL) 3|rn] yZ  
  return; (vJ2z =z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R[1BfZ6s  
 str.ReleaseBuffer(); me\cLFw  
 m_Path=str; "%@uO)A /  
 if(str.GetAt(str.GetLength()-1)!='\\') fA! 6sB  
  m_Path+="\\"; q6wr=OWD  
 UpdateData(FALSE); G_Ay   
} o0p T6N)  
WA)Ij(M8 p  
void CCaptureDlg::SaveBmp() ecX/K.8l  
{ !]S=z^"<  
 CDC dc; -qebQv  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l SkEuN  
 CBitmap bm; x7RdZC  
 int Width=GetSystemMetrics(SM_CXSCREEN); hxC!+ArVe  
 int Height=GetSystemMetrics(SM_CYSCREEN); M0-,M/]l  
 bm.CreateCompatibleBitmap(&dc,Width,Height); QMk+RM8U  
 CDC tdc; 2D([Z-<i  
 tdc.CreateCompatibleDC(&dc); BN@,/m9OQ%  
 CBitmap*pOld=tdc.SelectObject(&bm); mEQ!-p   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {$^SP7qV#>  
 tdc.SelectObject(pOld); !Zbesp KZ  
 BITMAP btm; >sj bK%  
 bm.GetBitmap(&btm); U&y`-@A4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "L3Xd][  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); TRKgBK$,  
 BITMAPINFOHEADER bih; %HSl)zEo>C  
 bih.biBitCount=btm.bmBitsPixel; u{bL-a8}  
 bih.biClrImportant=0; L"rcv:QWZa  
 bih.biClrUsed=0; [}3cDR  
 bih.biCompression=0; agd)ag4"[u  
 bih.biHeight=btm.bmHeight; F* #h9 Y  
 bih.biPlanes=1; PM4>ThQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^p_u.P  
 bih.biSizeImage=size; 135vZ:S  
 bih.biWidth=btm.bmWidth; 9DEh*%q  
 bih.biXPelsPerMeter=0; jxy1  
 bih.biYPelsPerMeter=0; kd;'}x=5yP  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); P 4;{jG  
 static int filecount=0; A1*4*  
 CString name; agaq`^[(P  
 name.Format("pict%04d.bmp",filecount++); 7CrpUh  
 name=m_Path+name; o@d y:AR  
 BITMAPFILEHEADER bfh; 5a(<%Q <"  
 bfh.bfReserved1=bfh.bfReserved2=0; CtT~0Y|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;o$;Z4:.D  
 bfh.bfSize=54+size; MB* u-N0v  
 bfh.bfOffBits=54; 4^O w^7N?  
 CFile bf; HR3_@^<7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v3JPE])/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); F$*3@Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j;2<-{  
  bf.WriteHuge(lpData,size); n6d^>s9J  
  bf.Close(); *\LyNL(  
  nCount++; ARx0zI%N  
 } m{&w{3pQk  
 GlobalFreePtr(lpData); C(,=[Fi-  
 if(nCount==1) O}gX{_|6  
  m_Number.Format("%d picture captured.",nCount); g8yN% )[  
 else 3 Lje<KzL  
  m_Number.Format("%d pictures captured.",nCount); 3C"_$?y"  
  UpdateData(FALSE); u3Do~RyL[  
} 7C5pAb:  
X&\o{w9%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) id?_>9@P  
{ 4uX(_5#j  
 if(pMsg -> message == WM_KEYDOWN) a{_ KSg  
 { O|UxFnB}  
  if(pMsg -> wParam == VK_ESCAPE) 8U^D(jrz  
   return TRUE; IT1P Pm  
  if(pMsg -> wParam == VK_RETURN) nC~fvyd<P  
   return TRUE; :l~EE!  
 } ~|R[O^9B  
 return CDialog::PreTranslateMessage(pMsg); >I-g[*  
} G&o64W;-s  
,#aS/+;[)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Za!w#j%h  
{ 1D$::{h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d_iY&-gq/  
  SaveBmp(); pAg$oe#  
  return FALSE; l.7d$8'\  
} _>v0R'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5w-JPjH  
 CMenu pop; zKJ. Tj W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _[1^s$  
 CMenu*pMenu=pop.GetSubMenu(0); kV 1vb  
 pMenu->SetDefaultItem(ID_EXITICON); QV/";A3k  
 CPoint pt; QUPf *3Oy  
 GetCursorPos(&pt); hb! ln7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C*O ,rm}  
 if(id==ID_EXITICON) bpMl =_  
  DeleteIcon(); n{{ P 3f  
 else if(id==ID_EXIT) }Z-I2 =]  
  OnCancel(); taCCw2s-8*  
 return FALSE; m %Y( O  
} s$3`X(Pn  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l7Y8b`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) i>"dBJh]b  
 AddIcon(); v?%3~XoH  
 return res; .M+v?A d  
}  i_y:4  
sVcdj|j  
void CCaptureDlg::AddIcon() \c68n  
{ > i`8R  
 NOTIFYICONDATA data; !a4cjc(  
 data.cbSize=sizeof(NOTIFYICONDATA); gV.f*E1C  
 CString tip; Oc^m_U8>^  
 tip.LoadString(IDS_ICONTIP); 8{@`kyy|  
 data.hIcon=GetIcon(0); F8 ?uQP8  
 data.hWnd=GetSafeHwnd(); n7+aM@G  
 strcpy(data.szTip,tip); H`?* bG  
 data.uCallbackMessage=IDM_SHELL; ixzTJ]yu  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;ct)H* y  
 data.uID=98; QmHwn)Ly  
 Shell_NotifyIcon(NIM_ADD,&data); 7&px+155  
 ShowWindow(SW_HIDE); Q!x`M4   
 bTray=TRUE; tO4):i1  
} T\cR2ZT~  
CfY7<o1>  
void CCaptureDlg::DeleteIcon() O8$~*NFJf  
{ Ft$^x-d  
 NOTIFYICONDATA data; Nor`c+,4  
 data.cbSize=sizeof(NOTIFYICONDATA); N Z)b:~a  
 data.hWnd=GetSafeHwnd(); &PSTwZd  
 data.uID=98; 3XGB+$]C  
 Shell_NotifyIcon(NIM_DELETE,&data); blmmm(|~|  
 ShowWindow(SW_SHOW); 9H[/Tj-;  
 SetForegroundWindow(); )"F5lOA6  
 ShowWindow(SW_SHOWNORMAL); K{N%kk%F  
 bTray=FALSE; pEkOSG  
} E+Im~=m$  
-^R b7 g-  
void CCaptureDlg::OnChange() iz$FcA]  
{ + lP5XY{  
 RegisterHotkey();  *0-v!\{  
} [5!'ykZ  
U81;7L8  
BOOL CCaptureDlg::RegisterHotkey()  'X|v+ ?  
{ mHHzCKE,  
 UpdateData(); s1Okoxh/!V  
 UCHAR mask=0; m'SmN{(t  
 UCHAR key=0; y3IA '  
 if(m_bControl) RE*WM3QK~  
  mask|=4; ;fj9 n-  
 if(m_bAlt) ^aT;aP^l  
  mask|=2; Dw*Arc+3V  
 if(m_bShift) -}<d(c  
  mask|=1; u2\+?`Ox  
  key=Key_Table[m_Key.GetCurSel()];  *[VEF  
 if(bRegistered){ \ U Ax(;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [\88@B=jXP  
  bRegistered=FALSE; =p5?+3" @  
 } T6,V  
 cMask=mask; % <^[j^j}o  
 cKey=key; G{/;AK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pK<%<dIc  
 return bRegistered; ,;7`{Nab  
} z;U LQ  
70duk:Ri0  
  四、小结 Uld_X\;Q4  
yB=C5-\F  
  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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