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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: +&*D7A>~p  
  !<8-juY  
  一、实现方法 zFba("E Z  
:]rb}1nLB  
  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: p|gzU$FWbk  
+QZ}c@'r  
#pragma data_seg("shareddata") W0 n?S "  
HHOOK hHook =NULL; //钩子句柄 i!a. 6Gq  
UINT nHookCount =0; //挂接的程序数目 ].Sz2vI  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $1E'0M`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 F{*h~7D-|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lM |}K-2  
static int KeyCount =0; n6xJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ++=f7y u  
#pragma data_seg() 28! ke  
#aua6V!"  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Ct<]('Hm(  
3-PqUJT$   
  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: 0Xw$l3@N^  
(B^rW,V[R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4aGVIQ  
cKey,UCHAR cMask) zCe[+F  
{ N*`qsv 0  
 BOOL bAdded=FALSE; r6Qsh CA"  
 for(int index=0;index<MAX_KEY;index++){ @dyh: 2!  
  if(hCallWnd[index]==0){ {6tj$&\)  
   hCallWnd[index]=hWnd; `6:B0-r  
   HotKey[index]=cKey; II'"Nkxd  
   HotKeyMask[index]=cMask; (UB?UJc  
   bAdded=TRUE; 0g`$Dap  
   KeyCount++; rQD^O4j R  
   break; 2;w`W58  
  } j>`-BN_  
 } vk4Q2P  
 return bAdded; zMXQfR   
} YvG=P<_xw  
//删除热键 |JLXgwML  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f}t8V% ^E  
{ 3oOr*N3R  
 BOOL bRemoved=FALSE; Nl'@Y^8N  
 for(int index=0;index<MAX_KEY;index++){ ;O7Vl5R  
  if(hCallWnd[index]==hWnd){ RG.wu6Av  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D&{CC  
    hCallWnd[index]=NULL; I.[Lv7U-  
    HotKey[index]=0; iax0V  
    HotKeyMask[index]=0; G*f\ /  
    bRemoved=TRUE; 5P{[8PZxbV  
    KeyCount--; #U(kK(uO  
    break; 1\a.o[g3e  
   } Ms#rvn!J  
  } \ZA@r|=$  
 } !z1\ #|>  
 return bRemoved; LS$zA>:  
} "AP$)xM-:  
GC~nr-O  
!zfKj0^  
  DLL中的钩子函数如下: PthgxB^  
|R2p^!m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) & 'CUc/,  
{ as(/ >p  
 BOOL bProcessed=FALSE; WvZt~x&2  
 if(HC_ACTION==nCode) \(RD5@=!4#  
 { a^8PB|G  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 UwxszEHC  
   switch(wParam) @qpj0i+>*  
   {  "BVp37 m;?  
    case VK_MENU: W4,'?o  
     MaskBits&=~ALTBIT; H,c`=Ii3  
     break; qW`?,N)r  
    case VK_CONTROL: L6ap |u  
     MaskBits&=~CTRLBIT; ap8q`a{j^  
     break; $ x:N/mMu`  
    case VK_SHIFT: 9a @rsyX  
     MaskBits&=~SHIFTBIT; 1_b*j-j  
     break; @dUN3,}  
    default: //judge the key and send message Vm[F~2+HX  
     break; C5~n^I|  
   } ! Sw=ns7  
   for(int index=0;index<MAX_KEY;index++){ $}.+}'7$  
    if(hCallWnd[index]==NULL) x5CMP%}d  
     continue; lWe cxD$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n\M8>9c  
    { *`rfD*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <:Mz2Rg  
     bProcessed=TRUE; @TQ/Z$y  
    } 9|lLce$  
   } d!UxFY@  
  } i!RfUod  
  else if((lParam&0xc000ffff)==1){ //有键按下 .9J}Z^FD  
   switch(wParam) TZ+ p6M8G  
   { ,l6,k<   
    case VK_MENU: x+j@YWDpG"  
     MaskBits|=ALTBIT; 3LT~- SvL  
     break; .1q}mw   
    case VK_CONTROL: |1 "&[ .  
     MaskBits|=CTRLBIT; b _<n]P*)  
     break; 1*yxSU@uY  
    case VK_SHIFT: p<{P#?4 g  
     MaskBits|=SHIFTBIT; v2E<~/|  
     break; mEbI\!}H0  
    default: //judge the key and send message \yu7,v  
     break; Q"ZpT  
   } 0F@~[W|2  
   for(int index=0;index<MAX_KEY;index++){  [#C6K '  
    if(hCallWnd[index]==NULL) Hf@4p'  
     continue; ~1%*w*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cZQ8[I  
    { L7Hv)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); aZ4?! JW.  
     bProcessed=TRUE; ^S 3G%{"  
    } 0\{dt4nW&O  
   } gK QJ^a\!  
  } p X{wEc6}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 NX,m6u  
   for(int index=0;index<MAX_KEY;index++){ t\hnnu`Pq  
    if(hCallWnd[index]==NULL) HoABo:  
     continue; 3fhY+$tq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ai1"UYk\\Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D9[19,2r`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ["<Xh0_  
   } y\Aa;pL)RQ  
  } r=5 S0  
 } !i)!|9e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S(Afo`  
} V ml 6\X  
U-9Aq  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: RJ'[m~yl5X  
!iKW1ks  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XnZ$ %?$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iHGVR  
bRxI7 '  
  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: ~j'D%:[+VH  
\{ @m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J:N(U0U  
{ VGc*aQYa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O~*i_t*i9{  
 { {P8d^=#q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *'-4%7C`1  
  SaveBmp(); T;92M}\  
  return FALSE; (<eLj Q  
 } v1,#7s AW'  
 …… //其它处理及默认处理 fWmc$r5n](  
} JB~^J5#[Oh  
'z. GAR  
._G ,uP$  
  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。 8M*+ |  
T]De{nHu  
  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。 T/3LJGnY  
e"t0 rScA  
  二、编程步骤 U3{<+vSR`  
\#HW.5  
  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"; 2T&MVl!%  
qS vV |G  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;d6Dm)/(  
SUc%dpXZa  
  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; }=/zG!+  
t(#9.b`W)  
  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; ?}KRAtJ8  
Op%OQ14$  
  5、 添加代码,编译运行程序。 ^v; )6a2  
ab2FK  
三、程序代码 c*)T4n[e  
5skN'*oG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]Lub.r  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "U}kp#)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?P'$Vxl  
#if _MSC_VER > 1000 SboHo({5VA  
#pragma once 3=.YQE0!dx  
#endif // _MSC_VER > 1000 0SI@`C*1o  
#ifndef __AFXWIN_H__ 4H#-2LV`  
#error include 'stdafx.h' before including this file for PCH +Uq|Yh'Q  
#endif ai_ve[A  
#include "resource.h" // main symbols <,M"kF:  
class CHookApp : public CWinApp U!(.i1^n  
{ KoERg&fY  
 public: 9^}&PEl  
  CHookApp(); |`LH|6/  
  // Overrides .?45:Ey~g  
  // ClassWizard generated virtual function overrides nQiZ6[L  
  //{{AFX_VIRTUAL(CHookApp) j9+4},>>CU  
 public: UGO#o`.G}  
  virtual BOOL InitInstance(); [J,.?'V  
  virtual int ExitInstance(); iww/s  
  //}}AFX_VIRTUAL [~9UsHfH  
  //{{AFX_MSG(CHookApp) 8qyEHUN2q  
  // NOTE - the ClassWizard will add and remove member functions here. |n 26[=\B  
  // DO NOT EDIT what you see in these blocks of generated code ! }X)vktE+|  
  //}}AFX_MSG MKBDWLCB  
  DECLARE_MESSAGE_MAP() K?uZIDo  
}; 1$&@wG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); a:cci?cb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b}K,wAx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pkn^K+<n,  
BOOL InitHotkey(); &D<R;>iI  
BOOL UnInit();  lbHgxZ  
#endif gQeQy  
WE) *~5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,CqWm9  
#include "stdafx.h" 83vMj$P  
#include "hook.h" 3x[C pg,  
#include <windowsx.h> ;C@mT;hR  
#ifdef _DEBUG PJ5}c!o[  
#define new DEBUG_NEW 0-Mzb{n5  
#undef THIS_FILE :{%[6lE^G  
static char THIS_FILE[] = __FILE__; Bv<gVt  
#endif &aRL}#U  
#define MAX_KEY 100 >5FTB e[D  
#define CTRLBIT 0x04 Fl`U{03  
#define ALTBIT 0x02 ng%[yY  
#define SHIFTBIT 0x01 dxX`\{E  
#pragma data_seg("shareddata") h.EI(Ev"GN  
HHOOK hHook =NULL; ,6>3aD1w~q  
UINT nHookCount =0; '[ #y|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey h3@tZL#g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT F vkyp"W3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &E&~9"^hQL  
static int KeyCount =0; CTNL->  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 99=~vNn  
#pragma data_seg() cUR :a @  
HINSTANCE hins; -.h)CM@L  
void VerifyWindow(); z8X7Y >+SA  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [^"*I.Z_  
//{{AFX_MSG_MAP(CHookApp) t.( `$  
// NOTE - the ClassWizard will add and remove mapping macros here. ~[Tcl  
// DO NOT EDIT what you see in these blocks of generated code! T~E;@weR  
//}}AFX_MSG_MAP m!xvWqY+  
END_MESSAGE_MAP() lUu0AZQmG  
'FXM7D   
CHookApp::CHookApp() a 8k2*u  
{ j-K[]$  
 // TODO: add construction code here, rDWAZ<;;  
 // Place all significant initialization in InitInstance a&%aads  
} U6&`s%mIa  
*p(_="J,  
CHookApp theApp; T1d@=&0"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p7|I>8ur.  
{ @ [;'b$T$  
 BOOL bProcessed=FALSE; l'l&Zqd  
 if(HC_ACTION==nCode) 2Ug_3ZuU  
 { fOMaTnm'  
  if((lParam&0xc0000000)==0xc0000000){// Key up h_ t`)]-  
   switch(wParam) 3fLdceT  
   { % (h6m${j  
    case VK_MENU: ;^:8F  
     MaskBits&=~ALTBIT; k:n{AoUc  
     break; PZ/ tkw  
    case VK_CONTROL: ~xG/yPl  
     MaskBits&=~CTRLBIT; V(cU/Aia^  
     break; l8E))oz1T  
    case VK_SHIFT: t5 >ma:^j  
     MaskBits&=~SHIFTBIT; Ju>QQOxi|  
     break; %rB,Gl:)g  
    default: //judge the key and send message 1a9' *[  
     break; [`tOhL  
   } ;ZB=@@l(  
   for(int index=0;index<MAX_KEY;index++){ 1o5kP,)  
    if(hCallWnd[index]==NULL) 0VvY(j:hp  
     continue; ~d&&\EZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &DGqY5=  
    { G!`%.tH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =X(N+(1~  
     bProcessed=TRUE; 'sAkrl8kt  
    } ty!DMg#  
   } 6\l F  
  } t _ CMsp  
  else if((lParam&0xc000ffff)==1){ //Key down #>_t[9;  
   switch(wParam) .;31G0<w2  
   { u"5/QB{  
    case VK_MENU: J4]"@0?6  
     MaskBits|=ALTBIT; Hd4 ~v0eS  
     break; iM!V4Wih6  
    case VK_CONTROL: 3T(ft^~  
     MaskBits|=CTRLBIT; !_Y%+Rkp0  
     break; &=t~_ Dc  
    case VK_SHIFT: MZV bOcSAd  
     MaskBits|=SHIFTBIT; bBINjs8C_  
     break; }vZfp5Y  
    default: //judge the key and send message Kez0Bka  
     break; fV9+FOZn  
   } )2"WC\%  
   for(int index=0;index<MAX_KEY;index++) 7/&taw%i  
   { !rgXB(  
    if(hCallWnd[index]==NULL) zx)}XOYf  
     continue; <O) if^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L]=mQo  
    { s j-oaWt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =WN8> <K!  
     bProcessed=TRUE; $o9^b Z  
    } oTk\r$4eb  
   } f`vWCb  
  } vy [7I8f{  
  if(!bProcessed){ c-zW 2;|61  
   for(int index=0;index<MAX_KEY;index++){  l  
    if(hCallWnd[index]==NULL) FM3.z)>  
     continue; 0<A*I{,4L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fC"? r6d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <> HI(6\@Z  
   } gRs @T<k2  
  } %>nAPO+e  
 } F6{ O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _0[s]  
} QBmARQ  
c&#Q`m  
BOOL InitHotkey() GwgY{-|`  
{  pb<eg,  
 if(hHook!=NULL){ Q_/UC#I8  
  nHookCount++; Oc~<`C~  
  return TRUE; ,X| >d  
 } kFQo[O]  
 else G{pF! q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  ]x1ba_  
  if(hHook!=NULL) K\}qY dPF  
   nHookCount++; C^JtJv  
  return (hHook!=NULL); U0|wC,7"  
} WO69Wo\C  
BOOL UnInit() M$v\7vBgO!  
{ Ai%Wt-  
 if(nHookCount>1){ ! .Pbbs%  
  nHookCount--; H5vg s2R  
  return TRUE; 1.2qh"#  
 } sNG 7fi.|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t`6~ ud>  
 if(unhooked==TRUE){ `j2|aX %Z*  
  nHookCount=0; `,FA3boE  
  hHook=NULL; (<`> B  
 } M;g"rpM  
 return unhooked; ) fuAdG  
} 4,`t9f^:  
ZDK+>^A)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FKtCUq,:  
{ CW@EQ3y0  
 BOOL bAdded=FALSE; W)2k>cS  
 for(int index=0;index<MAX_KEY;index++){ KVC18"|f  
  if(hCallWnd[index]==0){ aB&a#^5CI  
   hCallWnd[index]=hWnd; gW G>}M@  
   HotKey[index]=cKey; \= 6dF,V  
   HotKeyMask[index]=cMask; oj6=.   
   bAdded=TRUE; )CH\]>-FO  
   KeyCount++; aE]RVyG@L  
   break; t:'^pYN:g  
  } 'eQ*?a43  
 } ;x)f;!e+  
 return bAdded; 9D5v0Qi  
} h^zcM_  
)x,-O#"A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )\e0L/K@  
{ uMFV^&ZF  
 BOOL bRemoved=FALSE; BC%V<6JBu(  
 for(int index=0;index<MAX_KEY;index++){ 2Zq_zvKUt  
  if(hCallWnd[index]==hWnd){ ;k1VY Ie}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #%CB`l  
    hCallWnd[index]=NULL; Re;[S[D7  
    HotKey[index]=0; (^|vN ;  
    HotKeyMask[index]=0; 0;5qo~1  
    bRemoved=TRUE; utdus:B#0  
    KeyCount--; 0d,&)  
    break; |@D%y&  
   } CrGDo9JdvT  
  } U4NA'1yo  
 } + VhD]!  
 return bRemoved; N@? z&urQi  
} R"`<ZY6(Ou  
0$R}_Ok  
void VerifyWindow() Nk\/lK\  
{ I~M@v59C  
 for(int i=0;i<MAX_KEY;i++){ F{17K$y  
  if(hCallWnd!=NULL){ X5)].[d  
   if(!IsWindow(hCallWnd)){ yEL5U{  
    hCallWnd=NULL; @vi;P ^1!  
    HotKey=0; F PAj}as  
    HotKeyMask=0; p?<T _9e  
    KeyCount--; x]"N:t  
   } L# .vbf  
  } Ap(>mUs!i  
 } Qv;^nj{\qV  
} 3r2e_?m  
F`f8q\Fc  
BOOL CHookApp::InitInstance() rV/! VJ6x  
{ %\ !3tN  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4:s!mHcz  
 hins=AfxGetInstanceHandle(); .Nd_p{   
 InitHotkey(); $0 ~_)$i :  
 return CWinApp::InitInstance(); ^,fMs:  
} u3vw[k  
$gcC}tX  
int CHookApp::ExitInstance() YLNJ4nE  
{ \BdQ(rm  
 VerifyWindow(); /s`8=+\9  
 UnInit(); ~hQTxLp  
 return CWinApp::ExitInstance(); Q[%+y.  
} ^' b[#DG>F  
V%w]HIhq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file x)2ZbIDB:"  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4q`e<!MP)q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,6T3:qkkvF  
#if _MSC_VER > 1000 ET=-r  
#pragma once {r[g.@  
#endif // _MSC_VER > 1000 li)shp)  
:}~B;s0M\  
class CCaptureDlg : public CDialog [G}l;  
{ zqGo7;;#  
 // Construction m^YYdyn]M  
 public: Cq%1j[  
  BOOL bTray; $tca: b}Mk  
  BOOL bRegistered; v?#W/].C+  
  BOOL RegisterHotkey(); Pu0O6@Rg  
  UCHAR cKey; I(0 *cWO  
  UCHAR cMask; a*UxRi8  
  void DeleteIcon(); !L55S 0 3  
  void AddIcon(); ty)~]!tA  
  UINT nCount; ]n&Eb88  
  void SaveBmp(); d7!,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #s]`jdc  
  // Dialog Data H.s:a#l?  
  //{{AFX_DATA(CCaptureDlg) W"H*Ad(V  
  enum { IDD = IDD_CAPTURE_DIALOG }; ,mvU`>Ry  
  CComboBox m_Key; s% (|z  
  BOOL m_bControl; `&)uuLn|  
  BOOL m_bAlt; ~*^aCuq\  
  BOOL m_bShift; >Byxb./*  
  CString m_Path; 47^R  
  CString m_Number; UZ 6:vmcT  
  //}}AFX_DATA Ab)X/g-I @  
  // ClassWizard generated virtual function overrides Hyz:i)2  
  //{{AFX_VIRTUAL(CCaptureDlg) + Awo\;@,  
 public: ~&T%u.u 7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); lX|d:HFtP  
 protected: " midC(rTm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^q)s  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m\ (crkN  
  //}}AFX_VIRTUAL #TKByOcD2!  
  // Implementation 3Ay<2v  
 protected: -|3feYb'  
  HICON m_hIcon; }E](NvCq  
  // Generated message map functions xe!6Pgcb  
  //{{AFX_MSG(CCaptureDlg) ` @Tl7I\  
  virtual BOOL OnInitDialog(); /.%AE|0+X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tU >?j1  
  afx_msg void OnPaint(); H.]rH,8  
  afx_msg HCURSOR OnQueryDragIcon(); 4ai|*8.  
  virtual void OnCancel(); _|vY)4B 4U  
  afx_msg void OnAbout(); <gbm 1iEe  
  afx_msg void OnBrowse(); YgW 50)q^  
  afx_msg void OnChange(); 2<8JY4]!]  
 //}}AFX_MSG ' lMPI@C6r  
 DECLARE_MESSAGE_MAP() `\5u/i'Ca!  
}; ?*2Uw{~}  
#endif zDx*R3%  
};s8xGW:k3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7xy[;  
#include "stdafx.h" 1;N5@0%p  
#include "Capture.h" E [b6k&A  
#include "CaptureDlg.h" l5esx#([*R  
#include <windowsx.h> zY&/^^y  
#pragma comment(lib,"hook.lib") qA5PIEvdq  
#ifdef _DEBUG Ij9ezNZT=  
#define new DEBUG_NEW %[H|3  
#undef THIS_FILE [BzwQ 4  
static char THIS_FILE[] = __FILE__; YVS~|4hu?i  
#endif SdQ"S-H  
#define IDM_SHELL WM_USER+1 rq_0"A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4vbtB2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G [$u`mxV^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Bi$nYV)-l  
class CAboutDlg : public CDialog G[M{TS3&Ds  
{ 2 rx``,7Q  
 public: [|"{a  
  CAboutDlg(); ;{hE]jReH  
  // Dialog Data nH7i)!cI~  
  //{{AFX_DATA(CAboutDlg) BEnIyVU;L  
  enum { IDD = IDD_ABOUTBOX }; k9vzxZ%s:  
  //}}AFX_DATA m6^n8%  
  // ClassWizard generated virtual function overrides <maY S2  
  //{{AFX_VIRTUAL(CAboutDlg) '\I!RAZ  
 protected: urA kV#d#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i"J`$u  
  //}}AFX_VIRTUAL &R;Cm]jt  
  // Implementation K \_JG $(9  
 protected: lD\vq2  
  //{{AFX_MSG(CAboutDlg) r\DA&b  
  //}}AFX_MSG /yNLFL"  
  DECLARE_MESSAGE_MAP() }hyl)?*~  
}; pGdo:L?  
( !=^(Nd  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z}&JapJ  
{ MclW!CmJ  
 //{{AFX_DATA_INIT(CAboutDlg) rwSmdJ~  
 //}}AFX_DATA_INIT h k.Zn.6A'  
} |;k@Zlvc  
oZSPdk  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a1yGgT a?D  
{ }10ZPaHjl+  
 CDialog::DoDataExchange(pDX); 0$A7"^]  
 //{{AFX_DATA_MAP(CAboutDlg) %RX}sS  
 //}}AFX_DATA_MAP ?'I pR  
} n+9rx]W,  
-K*&I!  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !au%D?w  
 //{{AFX_MSG_MAP(CAboutDlg) N497"H</  
 // No message handlers 0;  BX  
 //}}AFX_MSG_MAP qGrUS_~q*  
END_MESSAGE_MAP() .T|1l$Jn  
i_M0P12  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~rICPR  
: CDialog(CCaptureDlg::IDD, pParent) [+4/M3J%  
{ 5w$\x+no  
 //{{AFX_DATA_INIT(CCaptureDlg) 0` \!O(jJ  
  m_bControl = FALSE; dAkJ5\=*  
  m_bAlt = FALSE; >hsvRX\_ `  
  m_bShift = FALSE; (f `zd.  
  m_Path = _T("c:\\"); _,{R3k  
  m_Number = _T("0 picture captured."); g\ q*,1  
  nCount=0; PG*:3![2  
  bRegistered=FALSE; I' TprT  
  bTray=FALSE; asd3J  
 //}}AFX_DATA_INIT Xah-*]ET  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H". [&VP5Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); gUtxyW  
} `@)>5gW&p  
9~ JeI/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7ts`uI<E@7  
{ ,wPvv(b]a  
 CDialog::DoDataExchange(pDX); .Qz412  
 //{{AFX_DATA_MAP(CCaptureDlg) \mGo k<b4  
  DDX_Control(pDX, IDC_KEY, m_Key); .qAlPe L:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yirQ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9w:9XziT  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bj$VYS"kY  
  DDX_Text(pDX, IDC_PATH, m_Path); 1Q>D^yPI[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y `ySNC  
 //}}AFX_DATA_MAP E@%9u#  
} Tw+V$:$$  
nXFPoR)T  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (`me}8  
//{{AFX_MSG_MAP(CCaptureDlg) xq-TT2}<L  
 ON_WM_SYSCOMMAND() pf[m"t6G~  
 ON_WM_PAINT() %Z]c[V.  
 ON_WM_QUERYDRAGICON() b"7L ;J5|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) PRQEk.C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6#za\[  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yHNx,ra   
//}}AFX_MSG_MAP )g ; !IL  
END_MESSAGE_MAP() o`+$h:zm@  
@r=v*hu  
BOOL CCaptureDlg::OnInitDialog() Z0#&D&2sV  
{ nC2e^=^  
 CDialog::OnInitDialog(); &&$,BFY4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); TcKt   
 ASSERT(IDM_ABOUTBOX < 0xF000); PqVz ^(Wz  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N6UPD11}6  
 if (pSysMenu != NULL) ` 5lW  
 { @:%p#$V  
  CString strAboutMenu; ![H{ndH!Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c[<>e#s+;  
  if (!strAboutMenu.IsEmpty()) 8o%g2 P9.  
  { rGIf/=G^r  
   pSysMenu->AppendMenu(MF_SEPARATOR); $z48~nu@ j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TkyP_*  
  } XSoHh-  
 } 4Mck/i2  
 SetIcon(m_hIcon, TRUE); // Set big icon t$zeB OI)  
 SetIcon(m_hIcon, FALSE); // Set small icon c%x9.s<+1  
 m_Key.SetCurSel(0); 4157!w'\y  
 RegisterHotkey(); U *K6FWqiB  
 CMenu* pMenu=GetSystemMenu(FALSE); VAnP3:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -~=?g9fGm6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (T 8In  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _-c1" Kl  
 return TRUE; // return TRUE unless you set the focus to a control 6haw\ *  
} Ygs:Ox"[-G  
 JcJc&cG  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)  up==g  
{ PL|zm5923  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &@[pJ2  
 { nBkzNb{"AZ  
  CAboutDlg dlgAbout; LTlbrB  
  dlgAbout.DoModal(); r<9G}9  
 } 8_:j.(n  
 else  Jk>!I\  
 { G<:gNWXd\  
  CDialog::OnSysCommand(nID, lParam); `)WC|=w2  
 } -,a@bF:  
} K'\Jnn  
>i!y[F  
void CCaptureDlg::OnPaint() v9"|VhZ  
{ PP&9ORG  
 if (IsIconic()) [x8_ax} w  
 { 1G<S'd+N  
  CPaintDC dc(this); // device context for painting .Q5zmaA]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )j\9IdkU;y  
  // Center icon in client rectangle T-a [  
  int cxIcon = GetSystemMetrics(SM_CXICON); [MXyOE  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5hj _YqQ7  
  CRect rect; ;FnU[Q`M#L  
  GetClientRect(&rect); C/#?S=w`4  
  int x = (rect.Width() - cxIcon + 1) / 2; ;6}> Shs  
  int y = (rect.Height() - cyIcon + 1) / 2; 1uco{JX<S  
  // Draw the icon *)D$w_06S  
  dc.DrawIcon(x, y, m_hIcon); 2|\WaH9P  
 } O<()T6  
 else \&\U&^?  
 { D5"Xjo*  
  CDialog::OnPaint(); MN^d28^/  
 } )K!!Zq3;|  
} iiLDl  
{M ^5w  
HCURSOR CCaptureDlg::OnQueryDragIcon() >J) 9&?  
{ Uu[dx}y  
 return (HCURSOR) m_hIcon; \5P 5N]]  
} x T1MW  
X 4CiVV  
void CCaptureDlg::OnCancel() Z9q1z~qSQ  
{ ac%x\e$  
 if(bTray) L ARMZoyi  
  DeleteIcon(); 3g87ir  
  CDialog::OnCancel(); a[=;6!  
} }fZ~HqS2w  
P!u0_6  
void CCaptureDlg::OnAbout() g&r3 ;  
{ K^e4w`F|  
 CAboutDlg dlg; ~FnuO!C  
 dlg.DoModal(); pmc)$3u  
} UK5u"@T  
aNUM F  
void CCaptureDlg::OnBrowse() p}p}!M|  
{ }6"l`$=Ev  
 CString str; FBeo@  
 BROWSEINFO bi; Nnq r{ub  
 char name[MAX_PATH]; V;d<S@$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U8OVn(qV  
 bi.hwndOwner=GetSafeHwnd(); $CDRIn50  
 bi.pszDisplayName=name; nhy:5eSK  
 bi.lpszTitle="Select folder"; #H;1)G(/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; m+QZ|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); cJ#n<Rsz  
 if(idl==NULL) *r)dtI*  
  return; I{i6e'.jP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }poLH S/  
 str.ReleaseBuffer(); 1vinO!  
 m_Path=str; GG %*d]  
 if(str.GetAt(str.GetLength()-1)!='\\') ^G14Z5.  
  m_Path+="\\"; <9]J/w+  
 UpdateData(FALSE); eCjyx|:J  
} [&sabM`Ul  
Ys]cJ]  
void CCaptureDlg::SaveBmp() -_BX\iP{  
{ cq~~a(IS  
 CDC dc; 2oo\SmO]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); J\hqK*/8  
 CBitmap bm; Ze?n Q-  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?{%"v\w  
 int Height=GetSystemMetrics(SM_CYSCREEN); 'HJ<"<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .UYhj8  
 CDC tdc; =g|5VXW5  
 tdc.CreateCompatibleDC(&dc); !NMiWG4R  
 CBitmap*pOld=tdc.SelectObject(&bm); D< 0))r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VV"w{#XKw  
 tdc.SelectObject(pOld); 1L%$\0B4hm  
 BITMAP btm; 3LZvlcLb  
 bm.GetBitmap(&btm); mhI   
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9B/iQCFtj$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7c83g2|%   
 BITMAPINFOHEADER bih; d%:J-UtG"  
 bih.biBitCount=btm.bmBitsPixel; eq@-J+  
 bih.biClrImportant=0; 63QF1*gPH  
 bih.biClrUsed=0; Q@[(0R1  
 bih.biCompression=0; U~w8yMxX  
 bih.biHeight=btm.bmHeight; KG GJ\r6  
 bih.biPlanes=1; $!^C|,CS  
 bih.biSize=sizeof(BITMAPINFOHEADER); +5Ju `Z  
 bih.biSizeImage=size; U$WGe >,  
 bih.biWidth=btm.bmWidth;  S8O,{  
 bih.biXPelsPerMeter=0; &aPR"X  
 bih.biYPelsPerMeter=0; "gt1pf~y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _6 @GT  
 static int filecount=0; 0nZQ" {x  
 CString name; [U:P&)  
 name.Format("pict%04d.bmp",filecount++); <Qt9MO`a  
 name=m_Path+name; \46*4?pP  
 BITMAPFILEHEADER bfh; cNMDI  
 bfh.bfReserved1=bfh.bfReserved2=0; HMhdK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,z#S=I  
 bfh.bfSize=54+size; 0,B"p  
 bfh.bfOffBits=54; ]"'1-h91  
 CFile bf; Bm  4$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3|%058bF  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); a7aj:.wi  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); P1R[M|Fx  
  bf.WriteHuge(lpData,size); yp)D"w4@  
  bf.Close(); h)^|VM   
  nCount++; zU'7x U-  
 } Y]!&, e,  
 GlobalFreePtr(lpData); +Jm[IN  
 if(nCount==1) pTT00`R  
  m_Number.Format("%d picture captured.",nCount); N~P1^x~  
 else :q~5Xw/  
  m_Number.Format("%d pictures captured.",nCount); :i|Bz6Ht4  
  UpdateData(FALSE); v8zOY#?  
} ^%0^DN  
Hc-up.?v'v  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) z:=E- +  
{ c]"w0a-`^@  
 if(pMsg -> message == WM_KEYDOWN) j /@<=  
 { tJ .Ln  
  if(pMsg -> wParam == VK_ESCAPE) Z29LtKr  
   return TRUE; ! F<::fN  
  if(pMsg -> wParam == VK_RETURN) ]|u7P{Z"R  
   return TRUE; X^rFRk  
 } mY]o_\`  
 return CDialog::PreTranslateMessage(pMsg); cPkP/3I]h  
} S VypR LVB  
5}a.<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K+ ~1z>&  
{ RK p9[^/?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ihekON":  
  SaveBmp(); +U4';[LG1C  
  return FALSE; \-sW>LIA  
} s>%.bAxc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d[Zx [=h  
 CMenu pop; f4VdH#eng`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /PbMt  
 CMenu*pMenu=pop.GetSubMenu(0); 7}e5ac  
 pMenu->SetDefaultItem(ID_EXITICON); 5Pf)&iG  
 CPoint pt; % bKy  
 GetCursorPos(&pt); gLg.mV1<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <$ qT(3w<y  
 if(id==ID_EXITICON) y}?PyPz  
  DeleteIcon(); [("2=Uz;  
 else if(id==ID_EXIT) .m.Ga|;  
  OnCancel(); O8Z+g{  
 return FALSE; D5:|CMQ  
} DK20}&RQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :4)(Qa(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n5)ml)m  
 AddIcon(); Ti7 @{7>  
 return res; PPh<9$1\g  
} =RZ PDu  
ZXXJ!9-&+J  
void CCaptureDlg::AddIcon() ]Inu'p\  
{ ))<vCfuz2  
 NOTIFYICONDATA data;  S9^S W3  
 data.cbSize=sizeof(NOTIFYICONDATA); (xKypc+j  
 CString tip; }^VikT]>1  
 tip.LoadString(IDS_ICONTIP); /%gMzF  
 data.hIcon=GetIcon(0); \UX9[5|  
 data.hWnd=GetSafeHwnd(); +3sbpl2}  
 strcpy(data.szTip,tip); s3  fQGbU  
 data.uCallbackMessage=IDM_SHELL; YT,yRV9#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *rB@[ (/  
 data.uID=98; !yr4B "kz  
 Shell_NotifyIcon(NIM_ADD,&data); f'*/IG  
 ShowWindow(SW_HIDE); (?TK P 7  
 bTray=TRUE; /F46Ac}I  
} <H{K&,Z(ZM  
lnK  
void CCaptureDlg::DeleteIcon() k7j[tB#  
{ CD5% iFy  
 NOTIFYICONDATA data; My Ky*wD  
 data.cbSize=sizeof(NOTIFYICONDATA); 6uKP BL@,  
 data.hWnd=GetSafeHwnd(); ; 6PRi/@  
 data.uID=98; R_>.O?U4  
 Shell_NotifyIcon(NIM_DELETE,&data); hwA&SS  
 ShowWindow(SW_SHOW); KP 6vb@(6  
 SetForegroundWindow(); O#p_rfQ  
 ShowWindow(SW_SHOWNORMAL); 9XKqsvdS  
 bTray=FALSE; Ep:hObWG)  
} Bs|Xq'1M!;  
%yd(=%)fMB  
void CCaptureDlg::OnChange() !%$,S=_F  
{ (nXnP{yb  
 RegisterHotkey(); ,In%r`{i  
} s {^wr6B  
;$e)r3r`LV  
BOOL CCaptureDlg::RegisterHotkey() mSvSdKKKlI  
{ &#KN"uPW  
 UpdateData(); \)6bLB!  
 UCHAR mask=0; wLb:FB2  
 UCHAR key=0; 4jGN:*kZ  
 if(m_bControl) t0r0{:  
  mask|=4; +@yU `  
 if(m_bAlt) oI'& &Bt  
  mask|=2; Ab>Kfr#  
 if(m_bShift) ]mz'(t  
  mask|=1; qkz|r?R)  
  key=Key_Table[m_Key.GetCurSel()]; [h !i{QD  
 if(bRegistered){ X Q CE`m  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); cB36w$n8  
  bRegistered=FALSE; "K$c9Z8  
 } &[ ],rT  
 cMask=mask; ru6M9\h*  
 cKey=key; nK)1.KVN  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TU58  
 return bRegistered; gK@`0/k{  
} !3\$XK]5ZT  
M d8(P23hS  
  四、小结 sC.r$K+k5  
Vh2uzG  
  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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