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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: hL/u5h%$  
  9rz$c, Y(  
  一、实现方法 'q:7PkN!p  
LRu*%3xx  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: yKj}l,i~8  
+zche  
#pragma data_seg("shareddata") 1K/ :  
HHOOK hHook =NULL; //钩子句柄 1HNP@9ga  
UINT nHookCount =0; //挂接的程序数目 qZ[HILh!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fTR6]i;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6:%lxG  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey tc`3-goX  
static int KeyCount =0; 4s:M}=]N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 *8,W$pe3  
#pragma data_seg() B`R@%US  
9kWI2cLzQt  
  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。 )N- '~<N  
64U|]g d$  
  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: Vv(buG  
FD E?O]^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .+XK>jl +  
cKey,UCHAR cMask) G.L}VpopM  
{ deYv&=SPl  
 BOOL bAdded=FALSE; cOdRb=?9  
 for(int index=0;index<MAX_KEY;index++){ b1#C,UWK  
  if(hCallWnd[index]==0){ rAHP5dx:  
   hCallWnd[index]=hWnd; oZ/"^5  
   HotKey[index]=cKey; GO2q"a  
   HotKeyMask[index]=cMask; 1QA/ !2E  
   bAdded=TRUE; 7)<Ib j<M  
   KeyCount++; *j&\5|^V  
   break; EmO[-W|2  
  } Heh&;c  
 } Jy}~ZY  
 return bAdded; 6 L4\UT r  
} <?IDCOt ?  
//删除热键 !4+Die X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {G vGV  
{ lq53 xT  
 BOOL bRemoved=FALSE; ^GM3nx$  
 for(int index=0;index<MAX_KEY;index++){ 3,v/zcV  
  if(hCallWnd[index]==hWnd){ 25`W"x_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N}VoO0I  
    hCallWnd[index]=NULL; 53aJnxX  
    HotKey[index]=0; q['D?)sy  
    HotKeyMask[index]=0; {9Qc\Ij  
    bRemoved=TRUE; ~cp=B>*(  
    KeyCount--; 3 xW:"  
    break; nkPlfH  
   } \9p.I?=  
  } +pT;; 9  
 } Jxe5y3* (  
 return bRemoved; U3B&3K} ~  
} "zNS6I?rzE  
qh6b;ae\x  
r1IvA^X  
  DLL中的钩子函数如下: d_$0  
-:d{x#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dL4VcUS.  
{ t*Ro2QZ  
 BOOL bProcessed=FALSE; f2gh|p`  
 if(HC_ACTION==nCode) vgtAJp+p*  
 { ;sYDs71y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 P]^8Enp  
   switch(wParam) B0yGr\KJ  
   {  . mO8 ~Z  
    case VK_MENU: }O crA/  
     MaskBits&=~ALTBIT; ?+=,t]`!m  
     break; p@Os  
    case VK_CONTROL: @Yb8CB  
     MaskBits&=~CTRLBIT; ']2d^'TH  
     break; <astIu Au  
    case VK_SHIFT:  Rh6CV  
     MaskBits&=~SHIFTBIT; Q`J U[nY  
     break; J|U~W kW  
    default: //judge the key and send message oq|o"n)~  
     break; \2El>>  
   } r%=a:GdAg  
   for(int index=0;index<MAX_KEY;index++){ AFsieJ  
    if(hCallWnd[index]==NULL) 6@# =z  
     continue; +|S)Mm8-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BR@gJ(2  
    { LC=M{\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  K%%Ow  
     bProcessed=TRUE; 3`SH-"{j%  
    } %jj-\Gz!  
   } )ZLj2H<  
  } g$)0E<  
  else if((lParam&0xc000ffff)==1){ //有键按下 _+)OL-  
   switch(wParam) [?<v|k  
   { n3V$Xtxw  
    case VK_MENU: M-Vz$D/aed  
     MaskBits|=ALTBIT; R$}Hv  
     break; D8w.r"ne  
    case VK_CONTROL: c{D<+XM  
     MaskBits|=CTRLBIT; ]S?G]/k}  
     break; F3!6}u\F  
    case VK_SHIFT: &-NGVPk81`  
     MaskBits|=SHIFTBIT; ZI$P Qz2i  
     break; X0ugnQ6  
    default: //judge the key and send message S]fkA6v  
     break; }3Ke  
   } ~IO'"h'w  
   for(int index=0;index<MAX_KEY;index++){ U%1M?vT/  
    if(hCallWnd[index]==NULL) $ta"Ug.z  
     continue; h-Ks:pcR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1n2Pr'|s  
    { b?Q$UMAbH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w(+ L&IBC  
     bProcessed=TRUE; ?en-_'}~a  
    } fOSJdX0e|Q  
   } mBrZ{hqS  
  } h8M}}   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /;q 3Q#  
   for(int index=0;index<MAX_KEY;index++){ ;H%'K  
    if(hCallWnd[index]==NULL) m>[G-~0?kI  
     continue; j1Sjw6}GCH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %y>*9$<pXe  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'dQGb-<_<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $i8oLSRV  
   } rjfWty%6pX  
  } mDwuJf8}  
 } >PdrLwKS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pkG8g5(w  
} )<'2 vpz  
0V"(}!=2a  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: s&WE'  
Vfq-H/+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3M[d6@a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SJ8 ~:"\P  
lnMU5[g{  
  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~~  
HCktgL:E=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c0jTQMe4yl  
{ J~ @W":v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) -ImO y|  
 {  W>x.*K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 XI ><;#  
  SaveBmp(); Bz,Xg-k+  
  return FALSE; Y>nQ<  
 } gHL:XW^  
 …… //其它处理及默认处理 HuA4eJ(2  
} N1:)Z`r  
ZLP0SCkuR  
i-95>ff  
  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。 8*VQw?{Uee  
,Wd+&|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。 NS x-~)  
) TNG0[  
  二、编程步骤 b83m'`vRM  
*&_(kq z'1  
  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"; |U~\;m@  
&u2m6 r>W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r5lPO*?Df  
Aba%QQQ  
  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; z+_d*\  
[w  FK!?  
  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%_A^t7  
JsX}PVuL  
  5、 添加代码,编译运行程序。 (c3O> *M  
K[V#Pj9  
三、程序代码 @9]TjZd  
mX @xV*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *L<<S=g$2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C2hB7?UGN  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k1D|Cpnp  
#if _MSC_VER > 1000 6SAYe%e  
#pragma once zP!j {y4w  
#endif // _MSC_VER > 1000 dHn,;Vv^6  
#ifndef __AFXWIN_H__ R C!~eJG!  
#error include 'stdafx.h' before including this file for PCH ]>+ teG:4  
#endif o8A(Cg}  
#include "resource.h" // main symbols [;C*9Nl  
class CHookApp : public CWinApp 5S! !@P!,  
{ (x[z=_I%`  
 public: p@YbIn  
  CHookApp(); ]*rK;  
  // Overrides .g_Kab3?L  
  // ClassWizard generated virtual function overrides >bwq  
  //{{AFX_VIRTUAL(CHookApp) py/#h$eY  
 public: N71%l  
  virtual BOOL InitInstance(); k <LFH(  
  virtual int ExitInstance(); 7X/B9Hee  
  //}}AFX_VIRTUAL x)kp*^/  
  //{{AFX_MSG(CHookApp) YO.+ 06X  
  // NOTE - the ClassWizard will add and remove member functions here. 99Nm?$ g  
  // DO NOT EDIT what you see in these blocks of generated code ! `q y@Qo  
  //}}AFX_MSG Q,o"[ &Gp  
  DECLARE_MESSAGE_MAP() f Lns^  
}; oHethk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ) @f6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SUoUXh^!w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @ w,O1Xwj  
BOOL InitHotkey(); &X}i%etp^2  
BOOL UnInit(); N/B-u)?\:  
#endif O 0P4uq  
QIcc@PGT9a  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >\1j`/ :ZI  
#include "stdafx.h" [@$t35t~  
#include "hook.h" 7t% |s!~  
#include <windowsx.h> Ch&2{ ng  
#ifdef _DEBUG ?ieC>cr  
#define new DEBUG_NEW bqZ5GKUo  
#undef THIS_FILE [_tBv" z  
static char THIS_FILE[] = __FILE__; mw${3j~&  
#endif R6irL!akAd  
#define MAX_KEY 100 HAcC& s8  
#define CTRLBIT 0x04 g % 8@pjk  
#define ALTBIT 0x02 MF5o\-&dN  
#define SHIFTBIT 0x01 E^Z?X2Z  
#pragma data_seg("shareddata") >s ;dooZ  
HHOOK hHook =NULL; 7Y1FFw |  
UINT nHookCount =0; @_"Z]Y ,D0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Dgz^s^fxU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tNDv[IF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey srIt_Wq  
static int KeyCount =0; ^#z*   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift e6'y S81  
#pragma data_seg() ;<K#h9#*7  
HINSTANCE hins; C.VU"= -  
void VerifyWindow(); U!524"@%U`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) p,S/-ph  
//{{AFX_MSG_MAP(CHookApp) U;Q?Rh- W  
// NOTE - the ClassWizard will add and remove mapping macros here. Z2I2 [pA  
// DO NOT EDIT what you see in these blocks of generated code! G9 ra;.  
//}}AFX_MSG_MAP ?Lquf&`vP  
END_MESSAGE_MAP() z7O$o/E-*  
s>e)\9c  
CHookApp::CHookApp() m+dJ3   
{ 9.l*#A^  
 // TODO: add construction code here, [Pz['q L3t  
 // Place all significant initialization in InitInstance k:`yxxYIh  
} .QM>^(o$Z  
}m.45n/  
CHookApp theApp; GsNZr=;C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &^K,"a{  
{ t`"pn <  
 BOOL bProcessed=FALSE; & ]1gx#  
 if(HC_ACTION==nCode) GNI:k{H@"?  
 { Ou2p^:C(  
  if((lParam&0xc0000000)==0xc0000000){// Key up 6fw2 ;$x"  
   switch(wParam) -h,?_d>  
   { Y/,Cy0!  
    case VK_MENU: N9BfjT}  
     MaskBits&=~ALTBIT; DYW&6+%,hO  
     break; !,cfA';S  
    case VK_CONTROL: ?%i~~hfH#N  
     MaskBits&=~CTRLBIT; 1C<@QrT  
     break; t'bhA20Z\  
    case VK_SHIFT: ~>>^7oq  
     MaskBits&=~SHIFTBIT; 7) Qq  
     break; )&.Zxo;q=  
    default: //judge the key and send message ;a~ e  
     break;  t'e5!Ma  
   } wp>L}!  
   for(int index=0;index<MAX_KEY;index++){ \~I>@SG2W+  
    if(hCallWnd[index]==NULL) zIbrw9G  
     continue; h~u|v[@{J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vW`[CEm^X  
    { +E }q0GV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $3^Cp_p6  
     bProcessed=TRUE; MW|:'D`  
    } DAx 1  
   } CjUYwAy$k  
  } Yp;?Zq9  
  else if((lParam&0xc000ffff)==1){ //Key down 7Nlk:f)*-  
   switch(wParam) >AUzsQ  
   { `z<I<  
    case VK_MENU: A\)~y{9bQ  
     MaskBits|=ALTBIT; BKd?%V8:Q  
     break; +W}6o3x~  
    case VK_CONTROL: V5bB$tL}3  
     MaskBits|=CTRLBIT; LHd9q ^D  
     break; *w[0uQL5Z  
    case VK_SHIFT: NbUbLzE  
     MaskBits|=SHIFTBIT; M.fA5rJ^  
     break; $9?<mP2-*  
    default: //judge the key and send message hf< [$B  
     break; @5*$yi 'Cp  
   } dc,qQM  
   for(int index=0;index<MAX_KEY;index++) b-HELS`nX  
   { C,VvbB  
    if(hCallWnd[index]==NULL) E5g|*M.+f  
     continue; &ZI-#(P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zAH6SaI$  
    { b r\_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); IRT0   
     bProcessed=TRUE; n|eM}ymF+  
    } b>L?0p$ej  
   } r&Qq,koE  
  } V3q [ $~9  
  if(!bProcessed){ 5odXT *n  
   for(int index=0;index<MAX_KEY;index++){ tYCVVs`?  
    if(hCallWnd[index]==NULL) #i=k-FA)H  
     continue; |Jny0a/0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YU/?AQg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nG0R1<  
   } (0^ZZe`# j  
  } )_SpY\J  
 } :?SD#Vvrh.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !TLJk]7uC  
} W}M 3z  
cr~.],$Om  
BOOL InitHotkey() U[W &D%'  
{ W(Rp@=!C  
 if(hHook!=NULL){ /o9 0O&  
  nHookCount++; l;}3J3/qq]  
  return TRUE; #O^%u,mJj  
 } sq;3qbz  
 else -mLS\TFS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #M@~8dAH}M  
  if(hHook!=NULL) 5Kw?#  
   nHookCount++; i7%`}t  
  return (hHook!=NULL); B0D  
} jGe%'A N\  
BOOL UnInit() ]D[\l$(  
{ T}59m;I  
 if(nHookCount>1){ "w3%BbIx  
  nHookCount--; ]EqwDw4  
  return TRUE; ji.T7wn1u  
 } 5:(/k\9+yv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "<&) G{  
 if(unhooked==TRUE){ DcN!u6sJ  
  nHookCount=0; ~]SCf@pRk  
  hHook=NULL; 63/a 0Yn  
 } st)qw]Dn;Y  
 return unhooked;  w>\_d  
} WaSZw0U}y  
06]"{2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) slAR<8  
{ ]EdZ,`B4  
 BOOL bAdded=FALSE; B_ bZa  
 for(int index=0;index<MAX_KEY;index++){ &cwN&XBY  
  if(hCallWnd[index]==0){ `RXlqj#u  
   hCallWnd[index]=hWnd; k%V YAON  
   HotKey[index]=cKey; p4D.nB8  
   HotKeyMask[index]=cMask; K #}t\  
   bAdded=TRUE; /h8100  
   KeyCount++; r+;k(HMY}[  
   break; h.q9p!  
  } Zxh<pd25Y  
 } %F\.1\&eE  
 return bAdded; 7[I +1  
} 2"_5Yyb  
*Sps^Wl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h s_x @6  
{ zI4d|P  
 BOOL bRemoved=FALSE; 9 !$&1|,*  
 for(int index=0;index<MAX_KEY;index++){ ~BMUea(  
  if(hCallWnd[index]==hWnd){ i6<uj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MV]`[^xQ5  
    hCallWnd[index]=NULL; C-XJe~  
    HotKey[index]=0; 6q^\pJY%&7  
    HotKeyMask[index]=0; hbEqb{#}@  
    bRemoved=TRUE; #4<=Ira5  
    KeyCount--; 6-FM<@H{  
    break; RK=Pm7L:`y  
   } Iw?*y.z|  
  } Q]e]\J  
 } @km4qJZ  
 return bRemoved; e$/y ~!  
} kU,g=+ 2J  
F}=_"IkZ  
void VerifyWindow() udmLHc  
{ n|Ts:>`V  
 for(int i=0;i<MAX_KEY;i++){ %xr'96d  
  if(hCallWnd!=NULL){ t~ <HFY*w  
   if(!IsWindow(hCallWnd)){ \Foo:jON  
    hCallWnd=NULL; r6GXmr  
    HotKey=0; =cO5Nt  
    HotKeyMask=0; ;hF}"shJN  
    KeyCount--; c\/-*OYr<  
   } c-_1tSh}  
  } Kp^"<%RT  
 } 4ETHaIiWp  
} TU': Rt  
{{?MO{Mh*  
BOOL CHookApp::InitInstance() |=07n K2  
{ bR,Es~n  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \iaZV.#f  
 hins=AfxGetInstanceHandle();  A@9\Qd  
 InitHotkey(); %!eRR  
 return CWinApp::InitInstance(); G|RBwl  
} =CO) Q2  
B!&y>Z^$  
int CHookApp::ExitInstance() K1o>>388G  
{ r+h%a~A#>  
 VerifyWindow(); Xu E' %;:  
 UnInit(); g9CedD%40  
 return CWinApp::ExitInstance(); rIb~@cR)  
} y4l-o  
H4sW%nZ0  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m(o`;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) { ^^5FE)%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ OQ4Pk/-'  
#if _MSC_VER > 1000 }a#T\6rY  
#pragma once ||fw!8E  
#endif // _MSC_VER > 1000 yYSmmgrX0  
Ghc U ~  
class CCaptureDlg : public CDialog %?, 7!|Ls  
{ !#~KSO}zW2  
 // Construction Uk*(C(  
 public: v_Df+  
  BOOL bTray; Z=Cw7E  
  BOOL bRegistered; w>8kBQ?b  
  BOOL RegisterHotkey(); &-{%G=5~e%  
  UCHAR cKey; M$Bb,s  
  UCHAR cMask; QmSMDWkh  
  void DeleteIcon(); zyO=x 4U8  
  void AddIcon(); ?@Q0;LG  
  UINT nCount; <T;V9(66  
  void SaveBmp(); *C0a,G4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8EMBqhl  
  // Dialog Data 'wtb"0 }  
  //{{AFX_DATA(CCaptureDlg) {&XTa`C  
  enum { IDD = IDD_CAPTURE_DIALOG }; tzfyS#E  
  CComboBox m_Key; B9[vv;lzu  
  BOOL m_bControl; ~cyKPg6  
  BOOL m_bAlt;  ^#C+l  
  BOOL m_bShift; cMF)2^w}  
  CString m_Path; |d-x2M[  
  CString m_Number; xQU//kNL  
  //}}AFX_DATA H }]Zp  
  // ClassWizard generated virtual function overrides H C,5j)1  
  //{{AFX_VIRTUAL(CCaptureDlg) 1h(IrV5g  
 public: ,A7:zxnc.V  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Pz[UAJ  
 protected: mdyl;e{0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >N2kWSa  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $]Ix(7@W  
  //}}AFX_VIRTUAL tu"-]^  
  // Implementation 5z9hcQAS  
 protected: p`rjWpH  
  HICON m_hIcon; U, 7  
  // Generated message map functions jnbR}a=fJ  
  //{{AFX_MSG(CCaptureDlg) >~Gy+-  
  virtual BOOL OnInitDialog(); ;?@Rq"*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 8(l0\R,%+z  
  afx_msg void OnPaint(); 5'+g[eNyBV  
  afx_msg HCURSOR OnQueryDragIcon(); g!' x5#]n  
  virtual void OnCancel(); y9]7LETv\M  
  afx_msg void OnAbout(); 8{!|` b'f  
  afx_msg void OnBrowse(); H^5,];  
  afx_msg void OnChange(); lP)n$?u  
 //}}AFX_MSG k{lo'  
 DECLARE_MESSAGE_MAP() w'A*EWO  
}; V6](_w!  
#endif :RukW.MR  
$xdo=4;|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file pfIK9>i  
#include "stdafx.h" xzOvc<u  
#include "Capture.h" A'7Y{oPHX  
#include "CaptureDlg.h" EPLHw  
#include <windowsx.h> {fDRVnI?  
#pragma comment(lib,"hook.lib") \p( 0H6  
#ifdef _DEBUG BeQ'\#q,  
#define new DEBUG_NEW -zMvpe-am&  
#undef THIS_FILE $*$4DG1gaR  
static char THIS_FILE[] = __FILE__; "%+||IyW  
#endif 4[gbRn'  
#define IDM_SHELL WM_USER+1 ": BZZ\!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f/Y7@y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `>g\gaQ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3BGcDyYE  
class CAboutDlg : public CDialog dc4XX5Z  
{ aM1WC 'c&)  
 public: Qj1%'wWG  
  CAboutDlg(); Lg,ObVt!  
  // Dialog Data jg'"?KSU~  
  //{{AFX_DATA(CAboutDlg) f. >[ J  
  enum { IDD = IDD_ABOUTBOX }; T"3LO[j+  
  //}}AFX_DATA 8YE4ln  
  // ClassWizard generated virtual function overrides YU 0pWM  
  //{{AFX_VIRTUAL(CAboutDlg) Iurz?dt4w  
 protected: BR?DW~7J j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W ^Fkjqpv  
  //}}AFX_VIRTUAL fV7 k{dR  
  // Implementation YGM7?o  
 protected: p=eSJ*  
  //{{AFX_MSG(CAboutDlg) "k  
  //}}AFX_MSG ;nbEV2Y<  
  DECLARE_MESSAGE_MAP() e@vZg8Ie  
}; |}e"6e%  
uEr.LCAS  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R\n@q_!`X  
{  PBW_9&d  
 //{{AFX_DATA_INIT(CAboutDlg) CE  
 //}}AFX_DATA_INIT muF&t'k  
} ow 6\j:$?  
 -L2 +4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @ YWuWF  
{ 2Hx*kh2  
 CDialog::DoDataExchange(pDX); yB *aG  
 //{{AFX_DATA_MAP(CAboutDlg) /8`9SS  
 //}}AFX_DATA_MAP FMn|cO.vEP  
} E=S_1  
#')] ~Xa  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U v>^ Z2  
 //{{AFX_MSG_MAP(CAboutDlg) ! @Vj&>mH$  
 // No message handlers w^HI lA  
 //}}AFX_MSG_MAP o](ORS$~  
END_MESSAGE_MAP() !IC .0I`  
H&F2[j$T  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xDekC~ Zq  
: CDialog(CCaptureDlg::IDD, pParent) Bqa_l|  
{ @W(,|xES  
 //{{AFX_DATA_INIT(CCaptureDlg) jL5O{R[ x:  
  m_bControl = FALSE; rk ,64(  
  m_bAlt = FALSE; V_v+i c^  
  m_bShift = FALSE; wod{C!  
  m_Path = _T("c:\\"); ~ W8 M3(^  
  m_Number = _T("0 picture captured."); gGA5xkA  
  nCount=0; 6rG7/  
  bRegistered=FALSE; U:MZN[Cc[  
  bTray=FALSE; TQ/#  
 //}}AFX_DATA_INIT _uJ6Vy  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R*LPwJuv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ebi~gGo  
} o!y<:CGL  
#&S<{75A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) B}p.fE  
{ "].TKF#yg  
 CDialog::DoDataExchange(pDX); j9RpYz  
 //{{AFX_DATA_MAP(CCaptureDlg) z=jzr=lP  
  DDX_Control(pDX, IDC_KEY, m_Key); j `3IizN2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); e2;=OoBK  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l<sWM$ez  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \B/( H)Cd*  
  DDX_Text(pDX, IDC_PATH, m_Path); (lYC2i_b#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l`0JL7  
 //}}AFX_DATA_MAP ao2o!-?!t  
} GLV`IkU %  
G8^b9xoA+.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Pj8Vl)8~NV  
//{{AFX_MSG_MAP(CCaptureDlg) }gX4dv B  
 ON_WM_SYSCOMMAND() 5/m*Lc+r  
 ON_WM_PAINT() Ai)Q(]  
 ON_WM_QUERYDRAGICON() Z$YG'p{S  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <bv9X?U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G Wj !n  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T~}g{q,tR  
//}}AFX_MSG_MAP X/Fip 0i  
END_MESSAGE_MAP() s\3ZE11L  
P8CIKoKCV  
BOOL CCaptureDlg::OnInitDialog() hE2{m{^A  
{ t `\l+L  
 CDialog::OnInitDialog(); o1]1I9  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -M[BC~!0;  
 ASSERT(IDM_ABOUTBOX < 0xF000); S|@ Y !  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 7#T@CKdUd  
 if (pSysMenu != NULL) &.0wPyw  
 { ROfke.N\'  
  CString strAboutMenu; 3i}$ ~rz]U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _1$+S0G;  
  if (!strAboutMenu.IsEmpty()) yAel4b/}  
  { 1&kf2\S  
   pSysMenu->AppendMenu(MF_SEPARATOR); {`L,F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !:g\Fe]  
  } 1tpt433  
 } .N#grk)C  
 SetIcon(m_hIcon, TRUE); // Set big icon .8|5;!`WB  
 SetIcon(m_hIcon, FALSE); // Set small icon '+S!>Lqb  
 m_Key.SetCurSel(0); O,I7M?dRf  
 RegisterHotkey(); hM(Hq4ed,  
 CMenu* pMenu=GetSystemMenu(FALSE); .M\0+,%/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *O Kve  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); = &U7:u  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); N9f;X{  
 return TRUE; // return TRUE unless you set the focus to a control 5hiuBf<  
} zjx'nK{eI  
QO,ge<N+N  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .7#04_aP  
{ UZc{ Av  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0j 'k%R[l  
 { C9T- 4o1  
  CAboutDlg dlgAbout; gD6BPW~0  
  dlgAbout.DoModal(); a4!6K  
 } -32.g \]  
 else +G!;:o  
 { A)^A2xZQ  
  CDialog::OnSysCommand(nID, lParam); ?[O Sy.6  
 } ><;.vP  
} QlxlT$o}  
FCYZ9L5uF  
void CCaptureDlg::OnPaint() iJu$&u  
{ UDa\*  
 if (IsIconic()) @L^30>?l  
 { 'cbD;+YH  
  CPaintDC dc(this); // device context for painting _~ 7cn  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =j1Q5@vS  
  // Center icon in client rectangle 3+%L[fW`/  
  int cxIcon = GetSystemMetrics(SM_CXICON); |G-o&m"  
  int cyIcon = GetSystemMetrics(SM_CYICON); 'P-FeN^  
  CRect rect; RK=YFE 0  
  GetClientRect(&rect); s0'Xihsw6  
  int x = (rect.Width() - cxIcon + 1) / 2; <QE/p0.  
  int y = (rect.Height() - cyIcon + 1) / 2; \hZ9in`YlR  
  // Draw the icon <.6$zcW  
  dc.DrawIcon(x, y, m_hIcon); 9hs7B!3pc>  
 } !1?Nc}T0Q&  
 else * @j#13.  
 { nr{ }yQ u  
  CDialog::OnPaint(); KfNR)  
 } s^AZ)k~J(  
} 3sGe#s%  
}Rq-IRa'  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~7=w,+  
{ Wv)2dD2I  
 return (HCURSOR) m_hIcon; We#O' m  
} KY;E.D`  
W?auY_+P  
void CCaptureDlg::OnCancel() -zL xT  
{ (z<& PP  
 if(bTray) #bLeK$  
  DeleteIcon(); [kq+a] q  
  CDialog::OnCancel(); uH!;4@ uI  
} "7a;Ap q*  
rB%acTCz=[  
void CCaptureDlg::OnAbout() Q1@V?`rkS{  
{ LaiUf_W#X  
 CAboutDlg dlg; xo_Es?  
 dlg.DoModal(); uBC*7Mkm  
} %S4pkFR  
=zW.~(c{  
void CCaptureDlg::OnBrowse() PfVjfrI[  
{ D(<20b,  
 CString str; +Gvf5+ 5VR  
 BROWSEINFO bi; M3dNG]3E  
 char name[MAX_PATH]; Lv ,Ls  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xpVYNS{c+|  
 bi.hwndOwner=GetSafeHwnd(); @7';bfsix  
 bi.pszDisplayName=name; fM)RO7  
 bi.lpszTitle="Select folder"; u_U51C\rb  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; j^Z3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $ p{Q]|ww  
 if(idl==NULL) /CN^">|_  
  return; cB7=4:U  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G P/3r[MH  
 str.ReleaseBuffer(); ~8EG0F;t  
 m_Path=str; "-TIao#  
 if(str.GetAt(str.GetLength()-1)!='\\') Ey u?T  
  m_Path+="\\"; 52#@.Qa  
 UpdateData(FALSE); s&$Zgf6Z  
} Si]8*>}-B  
Fu(I<o+T-  
void CCaptureDlg::SaveBmp() asI:J/%+2  
{ 4o2 C=?@(  
 CDC dc; &sQtS  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `W[oLQ  
 CBitmap bm; q-}J0vu\K  
 int Width=GetSystemMetrics(SM_CXSCREEN); hQgi--Msw'  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,*V{g pC7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !g~xn2m$R  
 CDC tdc; |&TRN1  
 tdc.CreateCompatibleDC(&dc); l>M&S^/s j  
 CBitmap*pOld=tdc.SelectObject(&bm); @Tr8.4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); vf(\?Js ,  
 tdc.SelectObject(pOld); 2,<!l(X  
 BITMAP btm; =GjxqIv  
 bm.GetBitmap(&btm); )vk$]<$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t <#Yr%a  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8<uKzb(O:  
 BITMAPINFOHEADER bih; xFS`#1  
 bih.biBitCount=btm.bmBitsPixel; j=d@Ih*  
 bih.biClrImportant=0; 3&-BO%i  
 bih.biClrUsed=0; "Gxf[6B  
 bih.biCompression=0; Rj% q)aw'  
 bih.biHeight=btm.bmHeight; }o? @  
 bih.biPlanes=1; DP*[t8  
 bih.biSize=sizeof(BITMAPINFOHEADER); W6~B~L  
 bih.biSizeImage=size; mY3x (#I  
 bih.biWidth=btm.bmWidth; m`-{ V<(M  
 bih.biXPelsPerMeter=0; d7tH~9GX8  
 bih.biYPelsPerMeter=0; Z %MP:@z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); y)!K@  
 static int filecount=0; o$YL\ <qp  
 CString name; 3%xj-7z W  
 name.Format("pict%04d.bmp",filecount++); 9[B*CD |  
 name=m_Path+name; hM(|d@)  
 BITMAPFILEHEADER bfh; jzu1>*ok  
 bfh.bfReserved1=bfh.bfReserved2=0; *A O/$K@Ma  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,?7U Rx*  
 bfh.bfSize=54+size; ueYZM<],  
 bfh.bfOffBits=54; KaHjL&!  
 CFile bf; bY;ah;<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ oO>mGl36H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nYMdYt04sl  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); eEQ 4L\d  
  bf.WriteHuge(lpData,size); ; eq^m,oz  
  bf.Close(); )}7rM6hv  
  nCount++; >e"CpbZ'  
 } h4S,(*V$!  
 GlobalFreePtr(lpData); (J~n|hA2/D  
 if(nCount==1) +X0?bVT  
  m_Number.Format("%d picture captured.",nCount); i}+K;,Da:8  
 else sL XQ)Ce  
  m_Number.Format("%d pictures captured.",nCount); 4jj@"*^a  
  UpdateData(FALSE); xO6)lVd  
} grnlJ=  
50Co/-)j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =g$%.  
{ V\WqA8  
 if(pMsg -> message == WM_KEYDOWN) 6<R!`N 6  
 { 2RidI&?c<  
  if(pMsg -> wParam == VK_ESCAPE)  -}{c;pT  
   return TRUE; =x9zy]  
  if(pMsg -> wParam == VK_RETURN) e&E""ye  
   return TRUE; +PY LKyS>  
 } &aaXw?/zr  
 return CDialog::PreTranslateMessage(pMsg); sUcx;<|BC  
} -D0kp~AO4N  
z'MOuz~Y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u:3~Ius  
{ ZPY#<^WOzr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _CBG?  
  SaveBmp(); p0UR5A>p  
  return FALSE; Y: oL  
} CbA!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9#iu#?*B  
 CMenu pop; diGPTV-?$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));  =h\,-8  
 CMenu*pMenu=pop.GetSubMenu(0); ;dNKe.`Dg  
 pMenu->SetDefaultItem(ID_EXITICON); &hEtVkK  
 CPoint pt; 7g cr$&+e  
 GetCursorPos(&pt); ]4yWcnf  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B{lBUv(B  
 if(id==ID_EXITICON) 'q8T*|/  
  DeleteIcon(); uMtq4.  
 else if(id==ID_EXIT) `[w:l[i  
  OnCancel(); CYmwT>P+*4  
 return FALSE; {xp/1? Mo*  
} &%}6&PW i  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iZB?5|*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S v$%-x^t  
 AddIcon(); *f=H#  
 return res; 1j "/}0fx  
} @S yGj#  
OW\r }  
void CCaptureDlg::AddIcon() gh|TlvnA  
{ 3G dWq*  
 NOTIFYICONDATA data; WrQe'ny  
 data.cbSize=sizeof(NOTIFYICONDATA); fa;\4#  
 CString tip; t{| KL<d]  
 tip.LoadString(IDS_ICONTIP); x-,+skZs  
 data.hIcon=GetIcon(0); v{"$:Z ow  
 data.hWnd=GetSafeHwnd(); /\hybx'  
 strcpy(data.szTip,tip); N2vSJ\u  
 data.uCallbackMessage=IDM_SHELL; kqYWa`eE  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; BYFvf(>  
 data.uID=98; eYMp@Cx  
 Shell_NotifyIcon(NIM_ADD,&data); 0 Ji>dr n  
 ShowWindow(SW_HIDE); (PE x<r1   
 bTray=TRUE; $+!/=8R)  
} SZW`|ajH  
B>WAlmPA  
void CCaptureDlg::DeleteIcon() +1~Y2   
{ 9`81br+~  
 NOTIFYICONDATA data; V)72]p  
 data.cbSize=sizeof(NOTIFYICONDATA); j BS$xW  
 data.hWnd=GetSafeHwnd(); w xKlBx7  
 data.uID=98; Jw)Uk< \  
 Shell_NotifyIcon(NIM_DELETE,&data); qR/~a  
 ShowWindow(SW_SHOW); J wL}|o6  
 SetForegroundWindow(); GSIRZJl  
 ShowWindow(SW_SHOWNORMAL); -/Pg[Lx7Pb  
 bTray=FALSE; w5w,jD[  
} L\)ssO uh  
)-%3;e<w  
void CCaptureDlg::OnChange() 9&}$C]`  
{ U,Ya^2h%  
 RegisterHotkey(); &#^^UT(nj  
} dE~]%fUFy-  
mZQW>A]iE  
BOOL CCaptureDlg::RegisterHotkey() ,c<&)6FU]  
{ T^> ST  
 UpdateData(); >7i&(6L  
 UCHAR mask=0; PTrKnuM\J_  
 UCHAR key=0; <fg~+{PA&  
 if(m_bControl) Ybo:2e  
  mask|=4; ce@1#}*  
 if(m_bAlt) #m=TK7*v  
  mask|=2; vVQwuV  
 if(m_bShift) )voJq\Y)%  
  mask|=1; S-l<+O1fy  
  key=Key_Table[m_Key.GetCurSel()]; RC'4%++Nz  
 if(bRegistered){ 2wLnRP`*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /j46`F  
  bRegistered=FALSE; ICA p  
 } U:"X *  
 cMask=mask; q{T [|(!  
 cKey=key; f?vbIc`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R8|H*5T?+  
 return bRegistered; M#%l}  
} L/\s~*:M  
])F*)U  
  四、小结 (iQ< [3C=  
0z&]imU  
  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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