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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: /$+ifiFT  
  CO 5?UgA  
  一、实现方法 'DRyOJnr  
&ATjDbW*(  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: }g>&l.2X  
]>*Z 1g;  
#pragma data_seg("shareddata") =GFlaGD  
HHOOK hHook =NULL; //钩子句柄 |w:7).P  
UINT nHookCount =0; //挂接的程序数目 ]U'KYrh  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 DQKhR sC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 LD]XN'?"W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey J&{E  
static int KeyCount =0;  Ur]5AJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9K FWa0G  
#pragma data_seg() L!-T`R8'c  
\CU.'|X  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 -DU[dU*~  
'OkF.bs  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: CW, Kw  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR OC"W=[Myl  
cKey,UCHAR cMask) J"I{0>@  
{ #L BZ%%v  
 BOOL bAdded=FALSE; !63x^# kg  
 for(int index=0;index<MAX_KEY;index++){ 9J0m  
  if(hCallWnd[index]==0){ U,aV {qz  
   hCallWnd[index]=hWnd; ^ 8egn|  
   HotKey[index]=cKey; gQ,PG  
   HotKeyMask[index]=cMask; /':kJOk<[  
   bAdded=TRUE;  A5Y z|  
   KeyCount++; S :9zz  
   break; UT]LF#.(  
  } #Z (B4YO  
 } LI"ghz=F  
 return bAdded; & 7JCPw  
} 95?$O~I  
//删除热键 ;]vE"Mx$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5BTQJa  
{ 4 K)P Yk  
 BOOL bRemoved=FALSE; CXvL`d"  
 for(int index=0;index<MAX_KEY;index++){ ~ hYG%  
  if(hCallWnd[index]==hWnd){ 60^dzi!vs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F7cv`i?2."  
    hCallWnd[index]=NULL; / u>")f  
    HotKey[index]=0; ndW? ?wiM  
    HotKeyMask[index]=0; PHZA?>Q7Z  
    bRemoved=TRUE; C+*: lLY  
    KeyCount--; NC@OmSR\0  
    break; z.P) :Er  
   } u= !?<Q  
  } &*[T  
 } iHWl%]7sN  
 return bRemoved; OpUC98p?@  
} trtI^^/%  
Z5_U D  
tE=P9 \4  
  DLL中的钩子函数如下: 6\/C]![%  
1i#M(u_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m7g; psg  
{ |HhUU1!  
 BOOL bProcessed=FALSE; h6 8sQd  
 if(HC_ACTION==nCode) ;la(Q~#  
 { G W|~sE +  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 NFU 5+X-c  
   switch(wParam) MXSPD# gN  
   {  gKn"e|A  
    case VK_MENU: 9.D'!  
     MaskBits&=~ALTBIT; L%U-MOS=  
     break; qL UbRp  
    case VK_CONTROL: Ej8EQ% P  
     MaskBits&=~CTRLBIT; >&Y8VLcK  
     break; iK= {pd  
    case VK_SHIFT: 3dQV5E.  
     MaskBits&=~SHIFTBIT; Jc(tV(z  
     break; yG2j!D  
    default: //judge the key and send message Z &/b p1  
     break; SA)}---"  
   } #3\F<AJ<VB  
   for(int index=0;index<MAX_KEY;index++){ u])N^AY"sj  
    if(hCallWnd[index]==NULL) 50uNgLs  
     continue; /i"L@t)\t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YeptYW@xfw  
    { _;L9&>!p6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i|)<#Ywl  
     bProcessed=TRUE; 1^b-J0  
    } _Cj u C`7  
   } AQQeLdTq  
  } s(r(! FZ  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]fnc.^{  
   switch(wParam) o!gl :izb  
   { =K- B I  
    case VK_MENU: BC 9rsb  
     MaskBits|=ALTBIT; E5/-?(N  
     break; M(0:>G  
    case VK_CONTROL: pg [F{T<  
     MaskBits|=CTRLBIT; xQ-]Iw5  
     break; -c~nmPEG6  
    case VK_SHIFT: BD\xUjd?)Q  
     MaskBits|=SHIFTBIT; TmvI+AY/  
     break; sas;<yh  
    default: //judge the key and send message D42Bm&JocO  
     break; #Bj.#5  
   } Z)~.OqRw]  
   for(int index=0;index<MAX_KEY;index++){ aP>%iRk'J!  
    if(hCallWnd[index]==NULL) AQDT6E:  
     continue; wm=!tx\`k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V<ziJ7H/  
    { >RG }u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nNSq6 Cj  
     bProcessed=TRUE; \/xWsbG\  
    } f-E]!\Pg  
   } :-fCyF)EI  
  } w[S2 ] <  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 kid3@  
   for(int index=0;index<MAX_KEY;index++){  Cdin"  
    if(hCallWnd[index]==NULL) uosFpa  
     continue; $8kc1Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G&I\Za;   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C4 H M  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 y)0r%=  
   } vUk <z*  
  } 5A g 4o  
 } [y7BHikX)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !_3R dS  
} dq+VW}[EO  
mJ2>#j;5f  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: k1e0kxn  
"94e-Nx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UA>UW!I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Mj&q"G  
j7IX"O%f\  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0 XxU1w8\V  
s"7wG!yf  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w] i&N1i  
{ 56Z 1jN^U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) B[%FZm$`M  
 { oKLL~X>!U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }1 = V`N(  
  SaveBmp(); oJE~dY$Q  
  return FALSE; TcPYDAa  
 } 5V;BimI  
 …… //其它处理及默认处理 b_+dNoB  
} 9*pH[vH  
3J%(2}{y  
4E/Q+^?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 uH!uSB2  
JKN0:/t7 Q  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 klmRU@D  
=~}\g;K1Q  
  二、编程步骤 KSe `G;{  
P1tc*2Z  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 5v >0$Y{  
q,w8ca 4~y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r`Y[XzT9  
*8{PoD   
  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; ByqB4Hv2  
wqEO+7)S  
  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; f_2tMiy 5  
P(D0ru  
  5、 添加代码,编译运行程序。 IhoV80b  
iPgewjx  
三、程序代码 29p`G1n  
\wwY?lOe  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wQ-pIi{G  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^NwXvp>7-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p B*8D  
#if _MSC_VER > 1000 2Hl0besm  
#pragma once I-<U u 2  
#endif // _MSC_VER > 1000 TJjcX?:(  
#ifndef __AFXWIN_H__ :)hS-*P  
#error include 'stdafx.h' before including this file for PCH +0) s {?  
#endif \ t4:(Jp 3  
#include "resource.h" // main symbols nQbF~   
class CHookApp : public CWinApp "5:^aC]  
{ X!#rw= Q  
 public: v0W w~4|],  
  CHookApp(); g$$i WC!S<  
  // Overrides M#ED49Dh>  
  // ClassWizard generated virtual function overrides D_mdX9-~  
  //{{AFX_VIRTUAL(CHookApp) U-!+Cxjs  
 public: Zt;3HY=y  
  virtual BOOL InitInstance(); B'<k*9=Nv8  
  virtual int ExitInstance(); [\+"<;m$  
  //}}AFX_VIRTUAL GIG\bQSv2  
  //{{AFX_MSG(CHookApp) i8t%v  
  // NOTE - the ClassWizard will add and remove member functions here. mNhVLB  
  // DO NOT EDIT what you see in these blocks of generated code ! .H;[s  
  //}}AFX_MSG Vm\ly;v'R  
  DECLARE_MESSAGE_MAP() QCjC|T9  
}; b'F#Y9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); R{={7.As+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8NU<lV`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I2"F2(>8K  
BOOL InitHotkey(); ;>%@  
BOOL UnInit(); P| c[EUT  
#endif g+'=#NS}  
ai|d`:;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D2<(V,h9  
#include "stdafx.h" #2AKO/  
#include "hook.h" XL SYE   
#include <windowsx.h> W:s`;8iM$  
#ifdef _DEBUG ++{,1wY\  
#define new DEBUG_NEW wNQhz.>y  
#undef THIS_FILE sv}k_6XgY  
static char THIS_FILE[] = __FILE__; MC=pN(l  
#endif Jw"fqr  
#define MAX_KEY 100 Q[sj/  
#define CTRLBIT 0x04 i b$2qy  
#define ALTBIT 0x02 |KH981  
#define SHIFTBIT 0x01 }C6RgE.6<  
#pragma data_seg("shareddata") ]nmVT~lBe"  
HHOOK hHook =NULL; =Rv!c+?  
UINT nHookCount =0; Q)vf>LwC2S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )o4B^kq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +b O]9* g]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  NW$_w  
static int KeyCount =0; ~%.<rc0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C|or2  
#pragma data_seg() #>[BSgW  
HINSTANCE hins; .r=F'i}-j*  
void VerifyWindow(); _o,Mji|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0Z{;sW  
//{{AFX_MSG_MAP(CHookApp) |/!3N  
// NOTE - the ClassWizard will add and remove mapping macros here. Lt 8J^}kwl  
// DO NOT EDIT what you see in these blocks of generated code! YC,)t71l{  
//}}AFX_MSG_MAP Wycood*  
END_MESSAGE_MAP() Nj~3FL  
ePD~SO9*  
CHookApp::CHookApp() '+8`3['  
{ 4n}tDHvd  
 // TODO: add construction code here, <,:p?36  
 // Place all significant initialization in InitInstance "CH3\O\  
} L_ &`  
^}VAH#c  
CHookApp theApp; ph5rS<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CN(}0/  
{ @cc4]>4  
 BOOL bProcessed=FALSE; CRpMpPi@}  
 if(HC_ACTION==nCode) +c+i~5B4  
 { j2dptM3t{  
  if((lParam&0xc0000000)==0xc0000000){// Key up Wjf,AjL\  
   switch(wParam) J/T$.*X  
   { |:[ [w&R  
    case VK_MENU: IXA3G7$)  
     MaskBits&=~ALTBIT; )c; YR}tC  
     break; 3$TU2-x;g  
    case VK_CONTROL: }={TVs^  
     MaskBits&=~CTRLBIT; Pjvzefp  
     break; !=/wpsH  
    case VK_SHIFT: ;kE|Vx  
     MaskBits&=~SHIFTBIT; Of@ LEEh6  
     break; \x(ILk|'c  
    default: //judge the key and send message [v%j?  
     break; p$S\l] ,  
   } f[wA ]&  
   for(int index=0;index<MAX_KEY;index++){ |L}1@0i  
    if(hCallWnd[index]==NULL) )0\"8}!  
     continue; |``rSEXYs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L9"yQD^R7?  
    { gS VWv9+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 78u9> H  
     bProcessed=TRUE; iYPlgt/Y!  
    } vGST{Lz;  
   } *IGCFZbp41  
  } Lo{g0~?x*  
  else if((lParam&0xc000ffff)==1){ //Key down ORdS|y;:  
   switch(wParam) 26K sP .-  
   { e]!`Cl-f80  
    case VK_MENU: 9P 7^*f:E  
     MaskBits|=ALTBIT; AJJa<c+j  
     break; P #PRzt  
    case VK_CONTROL: 7kT&}`g.  
     MaskBits|=CTRLBIT; G*y! Q  
     break; 50E?K!  
    case VK_SHIFT: l>t0 H($  
     MaskBits|=SHIFTBIT; +m>)q4e  
     break; :4\=xGiY  
    default: //judge the key and send message J]-z7<j']  
     break; B3';Tcs  
   } aS $ J `  
   for(int index=0;index<MAX_KEY;index++) q RbU@o.3  
   { 4DTT/ER'qA  
    if(hCallWnd[index]==NULL) C{<dzooz  
     continue; +9fQ YJBA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f_m~_`m  
    { Uv|?@zy#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <0h,{28  
     bProcessed=TRUE; {^ jRV@  
    } FpYeuH%  
   } JjC& io  
  } iTu~Y<'m  
  if(!bProcessed){ FPC^-mD  
   for(int index=0;index<MAX_KEY;index++){ 4))5l9kc.  
    if(hCallWnd[index]==NULL) *U}cj A:ZN  
     continue; W|I<hY\X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :G8:b.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); * ujJpJZ2  
   } E=&":I6O  
  } =3H*%  
 } AK_,$'f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]ME2V  
} 5\jzIB_?  
ZQ)vvD<  
BOOL InitHotkey() v"v-c!k  
{ v~AD7k2{8  
 if(hHook!=NULL){ kBlk^=h<:w  
  nHookCount++; :< *xG&  
  return TRUE; C(J+tbk  
 } Evy_I+l  
 else 'u84d=*l  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 2,^ U8/  
  if(hHook!=NULL) i[O{ M`Z%  
   nHookCount++; 14S_HwX  
  return (hHook!=NULL); {=Z _L?j  
} Id<O/C  
BOOL UnInit() k"pN  
{ *a2-Vte  
 if(nHookCount>1){ C lWxL#L6~  
  nHookCount--; gnWEsA\!  
  return TRUE; G]k+0&X  
 } xhw0YDGzf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3cSP1=$*  
 if(unhooked==TRUE){ x4Wu`-4^  
  nHookCount=0; wN2D{Jj  
  hHook=NULL; zS/1v+  
 } A2p]BW&  
 return unhooked; ?C`&*+  
} "*HVL  
-A(]U"@n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ('oA{,#L  
{ n qC@dHP  
 BOOL bAdded=FALSE; j9g0k<eg  
 for(int index=0;index<MAX_KEY;index++){ ?d5_{*]+v  
  if(hCallWnd[index]==0){  8\Uy  
   hCallWnd[index]=hWnd; gaC [%M  
   HotKey[index]=cKey; .qfU^AHA  
   HotKeyMask[index]=cMask; Zk<Y+!  
   bAdded=TRUE; 8k9q@FSln  
   KeyCount++; 0 ~^l*  
   break;  <6STw  
  } 4sM9~zC5  
 } pdq5EUdS  
 return bAdded; SpA-E/el  
} *OU&`\bmE  
fI"OzIJV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S '(K  
{ 8o\KF(I  
 BOOL bRemoved=FALSE; B.F~/PET  
 for(int index=0;index<MAX_KEY;index++){ T;1aL4w"  
  if(hCallWnd[index]==hWnd){ f|NWn`#bY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ tBtmqxx  
    hCallWnd[index]=NULL; #VU>Z|$@N  
    HotKey[index]=0; 3,dIW*<**  
    HotKeyMask[index]=0; PE&$2(  
    bRemoved=TRUE; d8N4@3CkL  
    KeyCount--; N@3&e;y  
    break; Tr$37suF  
   } 3hPp1wZd   
  } -Zfq:Kr  
 } `6FH@" |I  
 return bRemoved; f =kt0  
} [t+qYe8  
P,*yuF|bk  
void VerifyWindow() 4#&w-W  
{ N D1'XCN  
 for(int i=0;i<MAX_KEY;i++){ z:W|GDD1  
  if(hCallWnd!=NULL){ ,#8H9<O9t  
   if(!IsWindow(hCallWnd)){ .-?Txkwb  
    hCallWnd=NULL; x#jJ 0T  
    HotKey=0; yGE)EBH  
    HotKeyMask=0; 3!Cab/T  
    KeyCount--; &2//\Qz  
   } }@<Ru  
  } L',7@W  
 } @M=\u-jJ.  
} wak`Jte=}m  
q?=_{oH9  
BOOL CHookApp::InitInstance() Ox^VU2K;&.  
{ KF}_|~~T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sHm :G_  
 hins=AfxGetInstanceHandle(); 4R28S]Gb  
 InitHotkey(); B/gI~e0  
 return CWinApp::InitInstance(); :r+F95e  
} J  7]LMw7  
K?gO ]T{6  
int CHookApp::ExitInstance() Z/+H  
{ 22gh,e2o  
 VerifyWindow(); 6bd{3@   
 UnInit(); N7#,x9+E  
 return CWinApp::ExitInstance(); yq,%<%+  
} .v[!_bk8C  
(Z#j^}G_l  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {9|S,<9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Hr!%L*h?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5Tiap8x+<  
#if _MSC_VER > 1000 0khAi|PY  
#pragma once drd5o Z  
#endif // _MSC_VER > 1000 uYMH5Om+i  
8c'5P  
class CCaptureDlg : public CDialog )( W%Hmi  
{ an,JV0  
 // Construction +{[E Ow  
 public: Oz4yUR  
  BOOL bTray; u=& $Z  
  BOOL bRegistered;  R7ExMJw  
  BOOL RegisterHotkey(); VNHt ]Ewj  
  UCHAR cKey; eJ_$Etc  
  UCHAR cMask; 4{#0ci{  
  void DeleteIcon(); -|( q 9B  
  void AddIcon(); Vh8RVFi;c  
  UINT nCount; ](SqLTB+?  
  void SaveBmp(); ]tc Cr;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .y2np  
  // Dialog Data 0uhIJc'2  
  //{{AFX_DATA(CCaptureDlg) Q0(3ps~H  
  enum { IDD = IDD_CAPTURE_DIALOG }; k?`Q\  
  CComboBox m_Key; /9(8ML#E  
  BOOL m_bControl; laA3v3*  
  BOOL m_bAlt; B5MEE  
  BOOL m_bShift; F?hGt]o  
  CString m_Path; >IEc4  
  CString m_Number; zD): yEc  
  //}}AFX_DATA \5R>+[n!  
  // ClassWizard generated virtual function overrides ^/"2s}+  
  //{{AFX_VIRTUAL(CCaptureDlg) 3TF'[(K=  
 public: DPylc9[-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +Q&CIo  
 protected:  H;Cv] -  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k*o>ZpjNH  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2br~Vn0N  
  //}}AFX_VIRTUAL V<0J j  
  // Implementation 7!('+x(>  
 protected: )d7U3i  
  HICON m_hIcon; "j%L*J)  
  // Generated message map functions aKk0kC   
  //{{AFX_MSG(CCaptureDlg) "-A@d&5.  
  virtual BOOL OnInitDialog(); oPC qv  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &WHK|bl  
  afx_msg void OnPaint(); U_1N*XK6$  
  afx_msg HCURSOR OnQueryDragIcon(); 02mu%|"  
  virtual void OnCancel(); B+2Jea,N  
  afx_msg void OnAbout(); .MI 5?]_  
  afx_msg void OnBrowse(); am# (ms  
  afx_msg void OnChange(); [*v- i%U}  
 //}}AFX_MSG nCPIpw,]M  
 DECLARE_MESSAGE_MAP()  q a}=p  
}; ~)%DiGW&  
#endif t0+D~F(g  
^ Mw=!n[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file '~OKt`SfIo  
#include "stdafx.h" :?z E@Ct  
#include "Capture.h" # PZBh  
#include "CaptureDlg.h" kYU!6t1  
#include <windowsx.h> TTm  
#pragma comment(lib,"hook.lib") D0@d}N  
#ifdef _DEBUG ]R6Z(^XT,E  
#define new DEBUG_NEW vH/ Y]Am  
#undef THIS_FILE O*-sSf   
static char THIS_FILE[] = __FILE__; ^=Egf?|[  
#endif <PTi>C8;r  
#define IDM_SHELL WM_USER+1  cvO;xR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .Af H>)E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #Q$`3rr  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; m`H9^w%W  
class CAboutDlg : public CDialog QliP9-im3  
{ XaR(~2  
 public: %LBT:Aw  
  CAboutDlg(); rK r2 K'  
  // Dialog Data ff<ad l-  
  //{{AFX_DATA(CAboutDlg) i*ji   
  enum { IDD = IDD_ABOUTBOX }; ?Qdp#K]WX  
  //}}AFX_DATA -[-Ry6G  
  // ClassWizard generated virtual function overrides W!4xE  
  //{{AFX_VIRTUAL(CAboutDlg) v m)'C C  
 protected: atWB*kqI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6Rc%P)6  
  //}}AFX_VIRTUAL Z'|A>4\  
  // Implementation S[L2vM)  
 protected: OCYC Dn  
  //{{AFX_MSG(CAboutDlg) ybgAyJ{J<  
  //}}AFX_MSG Dd$CN&Ca  
  DECLARE_MESSAGE_MAP() Oky9G C.a  
}; 0fU^  
X]AbBzy  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) } P/ x@N  
{ "Go)t + -  
 //{{AFX_DATA_INIT(CAboutDlg) lp%i%*EQ*  
 //}}AFX_DATA_INIT U&<w{cuA  
} }doJ= lc  
=OU]<%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XqK\'8]\Mw  
{ t4CI+fqy  
 CDialog::DoDataExchange(pDX); PbN"+qM  
 //{{AFX_DATA_MAP(CAboutDlg) 3+| {O  
 //}}AFX_DATA_MAP ]z_C7Y"4BR  
} 1[r;  
{qkd63 X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) o= N_0.  
 //{{AFX_MSG_MAP(CAboutDlg) ,Jh('r7  
 // No message handlers HRZ3}8Qj  
 //}}AFX_MSG_MAP O.~@V(7ah  
END_MESSAGE_MAP() d*TpHLm  
SK_i 3?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +i.b&PF'H  
: CDialog(CCaptureDlg::IDD, pParent) bLpGrGJs  
{ ?{M!syD<  
 //{{AFX_DATA_INIT(CCaptureDlg) 9dXtugp|  
  m_bControl = FALSE; a?QDf5C q  
  m_bAlt = FALSE; 6 w:@i_2^  
  m_bShift = FALSE; jt8% L[  
  m_Path = _T("c:\\"); C/je5  
  m_Number = _T("0 picture captured."); ~'2im[f J  
  nCount=0; Nd.Tda!Kg  
  bRegistered=FALSE; 1WMwTBHy+  
  bTray=FALSE; !%_H1jk  
 //}}AFX_DATA_INIT ua!g}m~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h2C1'+Q{9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0kB!EJ<OdG  
} ,-[dr|.  
9QryW\6.@z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 'L0{Ed+9  
{ 4$<-3IP,  
 CDialog::DoDataExchange(pDX); ^>fjURR  
 //{{AFX_DATA_MAP(CCaptureDlg) 7,N>u8cTh  
  DDX_Control(pDX, IDC_KEY, m_Key); #Zy-X_r  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DG $._  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "x$RTuWA9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); KGI0|Z]n~  
  DDX_Text(pDX, IDC_PATH, m_Path); 7VwLyy  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wh<s#q`  
 //}}AFX_DATA_MAP ] x_WO_  
} Aa;s.:?  
d.3O1TXK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6hs2B5)+  
//{{AFX_MSG_MAP(CCaptureDlg) j!H\hj/]  
 ON_WM_SYSCOMMAND() `y!6(xI  
 ON_WM_PAINT() gB?~!J?  
 ON_WM_QUERYDRAGICON() .h8%zB#|i  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) tT;=l[7%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) = ?hx+-'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]8XY "2b  
//}}AFX_MSG_MAP vQ}'4i8(  
END_MESSAGE_MAP() fYzOT, c  
yEfV8aY'*  
BOOL CCaptureDlg::OnInitDialog() |,ZmRW^2K  
{ {m/\AG)1I  
 CDialog::OnInitDialog(); hL,+wJ+A  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7gV"pa  
 ASSERT(IDM_ABOUTBOX < 0xF000); `[;b#.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6_wf $(im  
 if (pSysMenu != NULL) @lP<Mq~]  
 { [[PUK{P0  
  CString strAboutMenu; Eqg(U0k0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); LyB$~wZx~@  
  if (!strAboutMenu.IsEmpty()) &!{wbm@  
  { ZN2g(  
   pSysMenu->AppendMenu(MF_SEPARATOR); >_biiW~x:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); nJ|8#U7  
  } .wD>0Ig  
 } #(53YoV_8  
 SetIcon(m_hIcon, TRUE); // Set big icon "kKIVlC  
 SetIcon(m_hIcon, FALSE); // Set small icon 6SMGXy*]^  
 m_Key.SetCurSel(0); e_wz8]K)n  
 RegisterHotkey(); o4b!U%  
 CMenu* pMenu=GetSystemMenu(FALSE); ogX'3L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4><b3r;T'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )CzWq}:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); In0kP"  
 return TRUE; // return TRUE unless you set the focus to a control *a@pZI0'  
} .Jz$)R  
"9 -duDg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y'n TyH  
{ HB4Hz0Fa  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [ed%"f  
 { %TUljX K}  
  CAboutDlg dlgAbout; ! G%LYHx  
  dlgAbout.DoModal(); 8Us5Oi  
 } k})Ag7c  
 else 9BGPq)#  
 { Jr18faEZw  
  CDialog::OnSysCommand(nID, lParam); .e2u)YqA  
 } ?r QMOJR  
} ,sk;|OAI  
~u&3Ki*x  
void CCaptureDlg::OnPaint() 0*%j6*XDq9  
{ 3R?7&oXvH  
 if (IsIconic()) 5( lE$&   
 { WIo^=?%  
  CPaintDC dc(this); // device context for painting 1{%EQhNd  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,LXuU8sB  
  // Center icon in client rectangle &tKs t,UR8  
  int cxIcon = GetSystemMetrics(SM_CXICON); <}%>a@  
  int cyIcon = GetSystemMetrics(SM_CYICON); &j/ WjZPF  
  CRect rect; +b] g;  
  GetClientRect(&rect); 6:B[8otQ  
  int x = (rect.Width() - cxIcon + 1) / 2; cW,wN~  
  int y = (rect.Height() - cyIcon + 1) / 2; *&B*/HAN  
  // Draw the icon :x97^.eW~  
  dc.DrawIcon(x, y, m_hIcon); bG>pm|/  
 } .bvB8VOrW  
 else $6:j3ZTXrt  
 { |Gjd  
  CDialog::OnPaint(); nD.4c-hd$q  
 } @.-g  
} ,:-S<]fS{_  
(^eSm]<  
HCURSOR CCaptureDlg::OnQueryDragIcon() IR>^U  
{ .F.4fk  
 return (HCURSOR) m_hIcon; I?"cEp   
} _{,e-_hYM  
MyuFZ7Q4$  
void CCaptureDlg::OnCancel() mY.[AIB  
{ sRo%=7Z  
 if(bTray) [S":~3^B6  
  DeleteIcon(); >E?626*  
  CDialog::OnCancel(); W)V"QrFK  
} [Y*p I&f  
d>NElug  
void CCaptureDlg::OnAbout() r M'snW)  
{ #:{PAt  
 CAboutDlg dlg; ~LHG  
 dlg.DoModal(); Te2XQU2,F  
} ZSYXUFz  
j0o_``  
void CCaptureDlg::OnBrowse() 8;.WX  
{ R3&W.?C T  
 CString str; a`GoNh,  
 BROWSEINFO bi; -U"(CGb5  
 char name[MAX_PATH]; -sGfpLy<6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R#Id"O  
 bi.hwndOwner=GetSafeHwnd(); a)4.[+wnRf  
 bi.pszDisplayName=name; bWwc2##7jo  
 bi.lpszTitle="Select folder"; A[;R_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (C,PGjd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); V?HC\F-  
 if(idl==NULL) 3yDa5q{  
  return; jRXByi=9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); c5<M=$  
 str.ReleaseBuffer(); P$Xig  
 m_Path=str; k%/Z.4vQG  
 if(str.GetAt(str.GetLength()-1)!='\\') ?^2(|t9KU  
  m_Path+="\\"; n'1pNL:  
 UpdateData(FALSE); 28LjQ!  
} a~7`;Ar  
L$l'wz  
void CCaptureDlg::SaveBmp() G*mk 19Z  
{ {Aj}s3v  
 CDC dc; !tmY_[\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Dx/?0F7V  
 CBitmap bm; 4iRcmsP  
 int Width=GetSystemMetrics(SM_CXSCREEN); zOCru2/  
 int Height=GetSystemMetrics(SM_CYSCREEN); -JaC~v(0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); tV@!jaj\  
 CDC tdc; 7 \!t/<  
 tdc.CreateCompatibleDC(&dc); C* b!E:  
 CBitmap*pOld=tdc.SelectObject(&bm); :Y0*P  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -2w\8]u  
 tdc.SelectObject(pOld); 9EK5#_L[=  
 BITMAP btm; F.?^ko9d  
 bm.GetBitmap(&btm); >"{3lDyq-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; i(2s"Uww,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); n4Ry)O[.  
 BITMAPINFOHEADER bih; gE0k|Z(RF  
 bih.biBitCount=btm.bmBitsPixel; dMQtW3stY  
 bih.biClrImportant=0; ((N<2G)  
 bih.biClrUsed=0; C\j|+s  
 bih.biCompression=0; c# U!Q7J  
 bih.biHeight=btm.bmHeight; ^|Of  
 bih.biPlanes=1; |(*ReQ?=  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5<GC  
 bih.biSizeImage=size; =" #O1$  
 bih.biWidth=btm.bmWidth; a"0Xam  
 bih.biXPelsPerMeter=0; 8{8J(~  
 bih.biYPelsPerMeter=0; ,mhO\P96ik  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OSK 3X Qc  
 static int filecount=0; AwAUm 2^  
 CString name; - {>JF  
 name.Format("pict%04d.bmp",filecount++); u= 5&e)v3  
 name=m_Path+name; <6)Ogv",  
 BITMAPFILEHEADER bfh; &#F>%~<or  
 bfh.bfReserved1=bfh.bfReserved2=0; D4ESo)15'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z[R E|l{  
 bfh.bfSize=54+size; =[FNZ:3  
 bfh.bfOffBits=54; 200/  
 CFile bf; kKr7c4q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y>3Zh5=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3u^U\xB  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yJ c#y   
  bf.WriteHuge(lpData,size); 5(^&0c>P  
  bf.Close(); b<P9@h~:  
  nCount++; Q.>@w<[!L  
 } <[@AMdS  
 GlobalFreePtr(lpData); )/1AF^ E  
 if(nCount==1) >u ,Ac:  
  m_Number.Format("%d picture captured.",nCount); xqs{d&W  
 else JQj?+PI  
  m_Number.Format("%d pictures captured.",nCount); 4%LGP h  
  UpdateData(FALSE); %YlL-*7 L  
} L%}k.)yev  
z Xx HaM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d`5xd@p  
{ KaNi'=nW  
 if(pMsg -> message == WM_KEYDOWN) szu!*wc9  
 { Wl/oun~o  
  if(pMsg -> wParam == VK_ESCAPE) 7+0Kg'^+n  
   return TRUE; c3W9"  
  if(pMsg -> wParam == VK_RETURN) y4PR&^l?g  
   return TRUE; 'c*Q/C;  
 } ~,WG284  
 return CDialog::PreTranslateMessage(pMsg); _HW~sz|  
} epI&R)]   
@e8b'w3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5I`j'j  
{ 3} @3pVS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _dky+ E  
  SaveBmp(); I`^ 7Bk.r  
  return FALSE; Ua\]]<hj"  
} 47 xyS%X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ umhg O.!  
 CMenu pop; As }:~Jy|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;gLHSHEA  
 CMenu*pMenu=pop.GetSubMenu(0); Q1yMI8  
 pMenu->SetDefaultItem(ID_EXITICON); tPBr{  
 CPoint pt; _y*@Hj  
 GetCursorPos(&pt); Mrysy)x  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %N$,1=0*  
 if(id==ID_EXITICON) D!Pv`wm  
  DeleteIcon(); v W=$C  
 else if(id==ID_EXIT) HX%lL }E  
  OnCancel(); xl8=y  
 return FALSE; ]rGZ  
} 5Iinen3>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); N4]QmRX/j  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Fk=Sx<TX  
 AddIcon(); qM= $,s*  
 return res; /~~aK2{^X~  
} .< 7M4Z  
@SeInew;`l  
void CCaptureDlg::AddIcon() tIn dve  
{ B( r~Nvc  
 NOTIFYICONDATA data; go >*n\  
 data.cbSize=sizeof(NOTIFYICONDATA); b* k=  
 CString tip; _/(DEF+G  
 tip.LoadString(IDS_ICONTIP); OH.^m6Z  
 data.hIcon=GetIcon(0); Sggha~E2s  
 data.hWnd=GetSafeHwnd(); KZrg4TEVi  
 strcpy(data.szTip,tip); & \tD$g~"  
 data.uCallbackMessage=IDM_SHELL; 7[z^0?Pygf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5:y\ejU  
 data.uID=98; S:2M9nC  
 Shell_NotifyIcon(NIM_ADD,&data); _=0%3Sh  
 ShowWindow(SW_HIDE); &CBW>*B  
 bTray=TRUE; >f+qImH  
}  dpG l  
>=Bl/0YH  
void CCaptureDlg::DeleteIcon() lw+Y_;  
{ ASGV3r (  
 NOTIFYICONDATA data; {zzc/!|  
 data.cbSize=sizeof(NOTIFYICONDATA); SB~HHx09  
 data.hWnd=GetSafeHwnd(); )(bAi  
 data.uID=98; ]JDKoA{S0  
 Shell_NotifyIcon(NIM_DELETE,&data); <14,xYpE  
 ShowWindow(SW_SHOW); ^4MRG6G  
 SetForegroundWindow(); Q /D?U[G  
 ShowWindow(SW_SHOWNORMAL); JTGA\K  
 bTray=FALSE; D)shWJRlvW  
} wavyREK   
MpY/G%3  
void CCaptureDlg::OnChange() &[ oW"Q{  
{ 1. A@5*Q  
 RegisterHotkey(); efzS]1Jpz  
} hc7"0mVd{  
X%(1C,C(  
BOOL CCaptureDlg::RegisterHotkey() . -ihxEbzr  
{ qmmQH S  
 UpdateData(); ^.3(o{g  
 UCHAR mask=0; )<ig6b%  
 UCHAR key=0; U$,-F**  
 if(m_bControl) _*iy *:(o  
  mask|=4; B:mtl?69g  
 if(m_bAlt) om_UQgC@r  
  mask|=2; h]6m+oPW  
 if(m_bShift) j(aok5:e  
  mask|=1; kPRG^Ox8e  
  key=Key_Table[m_Key.GetCurSel()]; 6&oaxAp<s  
 if(bRegistered){ <Wr n/%tL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); I{nrOb1G(  
  bRegistered=FALSE; q,;8Ka )  
 } S?Y%}  
 cMask=mask; ]?p 9)d=%<  
 cKey=key; MS5X#B  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Yt]Y(  
 return bRegistered; d.e_\]o<@  
} N[=c|frho  
7a0T]  
  四、小结 c"*xw8|  
LI}@qLe  
  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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