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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: Dm.tYG  
  eT|"6WJ:{  
  一、实现方法 {hLS,Me  
)G">7cg;t  
  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: oNfNe^/T  
c G`R\ $  
#pragma data_seg("shareddata") sP+ZE>7  
HHOOK hHook =NULL; //钩子句柄 JN Ur?+g  
UINT nHookCount =0; //挂接的程序数目 # [0>wEq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v^;%Fz_Dr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~e)`D nJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 50S >`qi2x  
static int KeyCount =0; {U,q!<@mq  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 5l&9BS&  
#pragma data_seg() %Z"I=;=nxI  
#CaT0#v  
  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_=},a  
u\JYxNj1  
  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: MJ )aY2  
u{-J?t&`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fs=W(~"  
cKey,UCHAR cMask) N>'T"^S/  
{ QE.a2 }  
 BOOL bAdded=FALSE; B-<H8[GkG1  
 for(int index=0;index<MAX_KEY;index++){ PJCRvs|X  
  if(hCallWnd[index]==0){ C(^IX"9 #  
   hCallWnd[index]=hWnd; jd&kak  
   HotKey[index]=cKey; A{!D7kwTz~  
   HotKeyMask[index]=cMask; ;DkX"X+  
   bAdded=TRUE; v/Z!Wp1LV  
   KeyCount++; .\?)O+J!  
   break; UUlrfur~  
  } "[*W=6m0  
 } z}" Xt=G?  
 return bAdded; OC[+t6  
} ~S],)E1w  
//删除热键 k3 65.nc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SRixT+E  
{ #hOAG_a,  
 BOOL bRemoved=FALSE; ,MtN_V-  
 for(int index=0;index<MAX_KEY;index++){ {M5[gr%  
  if(hCallWnd[index]==hWnd){ W+'|zhn  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \.R+|`{tf  
    hCallWnd[index]=NULL; E_aDkNT  
    HotKey[index]=0; 22|a~"Z  
    HotKeyMask[index]=0; L0Fhjbc  
    bRemoved=TRUE; (oYM}#Q  
    KeyCount--; V=@M!;'<  
    break; YB}p`b42L  
   } ]Y%?kQ^  
  } 6n 2LG  
 } ~ [por  
 return bRemoved; er0hf2N]  
} >|Hd*pg))  
Gj.u /l  
M=57 d7  
  DLL中的钩子函数如下: ZkyH<Aa  
}538vFNi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4mG?$kCN  
{ gZFtV  
 BOOL bProcessed=FALSE; o771q}?&`  
 if(HC_ACTION==nCode) bGl5=`  
 { SLa\F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2xchjU-  
   switch(wParam) BJM_kKH  
   {  oM=Ltxv}  
    case VK_MENU: O;N QJ$^bI  
     MaskBits&=~ALTBIT; 2VNMz[W'  
     break; v$O%U[e<  
    case VK_CONTROL: 0<{+M`G/  
     MaskBits&=~CTRLBIT; ]yxRaW9f  
     break; Zz\e:/  
    case VK_SHIFT: fR=B/`  
     MaskBits&=~SHIFTBIT; mgB7l0)b  
     break; TZT1nj"n  
    default: //judge the key and send message +,xl_,Z6  
     break; |kHPk)}I]  
   } vKzq7E  
   for(int index=0;index<MAX_KEY;index++){ .}}w@NO  
    if(hCallWnd[index]==NULL) FM c9oyU~  
     continue; USKa6<:{W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2qb,bp1$  
    { ;xnJ+$//U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kp~@Ub @O3  
     bProcessed=TRUE; wX3x.@!:  
    } Z;^UY\&X  
   } A 'Q nL  
  } "]%.%$  
  else if((lParam&0xc000ffff)==1){ //有键按下 9tW=9<E  
   switch(wParam) Yy4? |wVl  
   { y%X{[F  
    case VK_MENU: ?(cbZ#( o  
     MaskBits|=ALTBIT; 3w=OvafT:  
     break; k+au42:r  
    case VK_CONTROL: tFvc~zz9  
     MaskBits|=CTRLBIT; Zhl}X!:c?\  
     break; Zd/ACZ[  
    case VK_SHIFT: cG|ihG5)  
     MaskBits|=SHIFTBIT; 8+Y+\XZG  
     break; .[v4'ww^  
    default: //judge the key and send message ,8KD-"l^g  
     break; 'V reO52  
   } H!y%FaTi  
   for(int index=0;index<MAX_KEY;index++){ ZiBTe,;  
    if(hCallWnd[index]==NULL) DK/xHIv8-  
     continue; \X5>HPB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Nw`}iR0i  
    { cxhS*"Ph  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qwlIz/j  
     bProcessed=TRUE; 7|A9  
    } /( /)nYAjk  
   } wG1A]OJl1  
  } Fd:A^]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -saisH6  
   for(int index=0;index<MAX_KEY;index++){ dMAd-q5{  
    if(hCallWnd[index]==NULL) -[cl]H)V  
     continue; 2Uf}gG)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1C[j:Ly/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~.;S>o[  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tL?nO#Qx  
   } i-(^t1c  
  } 6m_whGosi  
 } %&L]k>n^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #`tn:cP  
}  g?qh  
U*G9fpVy  
  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: [vuqH:Ln  
K)|#FRPM u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fmDU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fqaysy  
5>J{JW|  
  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: s6k,'`.  
6~Y-bn"%D5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "(uEcS2<  
{ hjB G`S#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4}:a"1P"  
 { o#X|4bES  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _ri1RK,  
  SaveBmp(); 1LTl=tS#  
  return FALSE; F&r+"O)^-R  
 } J1I"H<}-6  
 …… //其它处理及默认处理 8iTX}$t\{  
} mOj6 4}_`"  
V 0Ul`  
<(Ub(  
  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。 mmrx*sr=  
=W1`FbR  
  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。 3lc'(ts %  
xU/Eu;m  
  二、编程步骤 ]| oh1q  
[TiOh'  
  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"; 9W ng(ef6G  
`nA_WS  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U88-K1G  
YYDLFt r2  
  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; m2[q*k]AtS  
v~>^c1:  
  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; ^ q]BCOfJ(  
GWZ0!V  
  5、 添加代码,编译运行程序。 41y}n{4n8  
k'uN2m  
三、程序代码 :]%z8,6k  
,bRvj8"M  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _5I" %E;S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ,^ MA,"8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ gd>Op  
#if _MSC_VER > 1000 |r"1 &ow5  
#pragma once 7<V(lX.{  
#endif // _MSC_VER > 1000 Ic 4>kKh  
#ifndef __AFXWIN_H__ Zfyr& ]"  
#error include 'stdafx.h' before including this file for PCH jIx5_lFe  
#endif cT abZc  
#include "resource.h" // main symbols s8T} ah!  
class CHookApp : public CWinApp @DYxxM-  
{ @&;y0N1xo  
 public: <>,V> k|  
  CHookApp(); T)Byws  
  // Overrides [xT2c.2__J  
  // ClassWizard generated virtual function overrides noiUi>G;:  
  //{{AFX_VIRTUAL(CHookApp) ^\kv> WBE  
 public: {l= !  
  virtual BOOL InitInstance(); Q7O8']~n  
  virtual int ExitInstance(); N%{&%C6{  
  //}}AFX_VIRTUAL lJ!+n<K+  
  //{{AFX_MSG(CHookApp) {uEu ^6a5  
  // NOTE - the ClassWizard will add and remove member functions here. &) 7umdSgi  
  // DO NOT EDIT what you see in these blocks of generated code ! iJ_FJ[ U  
  //}}AFX_MSG =/MAKi}g  
  DECLARE_MESSAGE_MAP() is`Eqcj`dr  
}; iQpKcBx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); CMa~BOt#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E 5PefD\m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L- [<C/`;t  
BOOL InitHotkey(); ^y"Rdv  
BOOL UnInit(); (l : ;p&[  
#endif _|.q?;C]$  
n0#HPI"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;wCp j9hir  
#include "stdafx.h" q: . URl  
#include "hook.h" :`6E{yfM  
#include <windowsx.h> VJ P]Jy_  
#ifdef _DEBUG R?g qPi-  
#define new DEBUG_NEW UPgjf  
#undef THIS_FILE R iid,n  
static char THIS_FILE[] = __FILE__; RrSo`q-h+  
#endif C,:3z  
#define MAX_KEY 100 Oa=0d;_  
#define CTRLBIT 0x04 o|G.tBpKg  
#define ALTBIT 0x02 N?0T3-/K  
#define SHIFTBIT 0x01 ?1 $.^  
#pragma data_seg("shareddata") @qH{;  
HHOOK hHook =NULL; H"f%\'  
UINT nHookCount =0; 0hK)/!Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5% C-eB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?}y?e}y*xZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey uNV (r"  
static int KeyCount =0; pulE6T7 x  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \:C@L&3[  
#pragma data_seg() 6JBE=9d-Q  
HINSTANCE hins; I0oM\~#  
void VerifyWindow(); - 8&M^-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) t5 n$sF  
//{{AFX_MSG_MAP(CHookApp) jI0gQ [  
// NOTE - the ClassWizard will add and remove mapping macros here. B@dA?w.x  
// DO NOT EDIT what you see in these blocks of generated code! p;Kw$fQ?  
//}}AFX_MSG_MAP :~BY[")  
END_MESSAGE_MAP() X.V7od>  
G&MI@Hq  
CHookApp::CHookApp() E`.dU<8HE  
{ XEM i~L+  
 // TODO: add construction code here, U}(*}Ut  
 // Place all significant initialization in InitInstance 8)3g!3S  
} |RX u O  
lCg'K(|"  
CHookApp theApp; eZs34${fN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YuXq   
{ 'cJHOd  
 BOOL bProcessed=FALSE; hb7H- Z2  
 if(HC_ACTION==nCode) C0;c'4(  
 { zuR!,-W  
  if((lParam&0xc0000000)==0xc0000000){// Key up >lxhXYp  
   switch(wParam) ^'r/;(ZF*/  
   { n\&[^Q#b|  
    case VK_MENU: dN J2pfvv  
     MaskBits&=~ALTBIT; h{I)^8,M  
     break; BKe~ y  
    case VK_CONTROL: &^^zm9{  
     MaskBits&=~CTRLBIT; ?)k;.<6  
     break; 0m_c43+^  
    case VK_SHIFT: r8rU+4\8<  
     MaskBits&=~SHIFTBIT; K1 a$ m2  
     break; 2ku\R7  
    default: //judge the key and send message + |MHiC  
     break; o7E?A  
   } 6}A1^RB+w  
   for(int index=0;index<MAX_KEY;index++){ 8@ck" LUzD  
    if(hCallWnd[index]==NULL) a=\r~Z7E  
     continue; }7E2,A9_"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GL'zs8AKf  
    { !},_,J~(|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0|n1O)>J  
     bProcessed=TRUE; 0dA'f0Uy\X  
    } sI/Jhw)  
   } zl\mBSBx"  
  } x\!Q[  
  else if((lParam&0xc000ffff)==1){ //Key down b&X- &F  
   switch(wParam) >8+:{NW  
   { j-@3jFu  
    case VK_MENU: fEF1&&8^  
     MaskBits|=ALTBIT; j u`x   
     break; x;2tmof=L  
    case VK_CONTROL: u{maE ,  
     MaskBits|=CTRLBIT; 4~=/CaG~  
     break; V9qA.NV2  
    case VK_SHIFT: ,[ &@?  
     MaskBits|=SHIFTBIT; [f,; +Ze  
     break; ZW n j-  
    default: //judge the key and send message JlJy3L8L  
     break; W>+\A"  
   } >.N?y@  
   for(int index=0;index<MAX_KEY;index++) VeidB!GyP  
   { cLn&b}8'  
    if(hCallWnd[index]==NULL) IY2ca Xu  
     continue; JSCe86a7<E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hDI_qZ  
    { 0@ []l{N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #@Yw]@5M  
     bProcessed=TRUE; uH S)  
    } &u0JzK  
   } HTuv_kE  
  } 4`Qu+&4J  
  if(!bProcessed){ 6Pc3;X~  
   for(int index=0;index<MAX_KEY;index++){ E!w%oTx{OR  
    if(hCallWnd[index]==NULL) `''\FPhh  
     continue; xG i,\K\:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CL oc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +@>K]hdr  
   } n!e4"|4~z  
  } hOjy$Z  
 } o8c4h<,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Cc7PhoPK  
} ~YO99PP  
9`eu&n@Z  
BOOL InitHotkey() 3:1 h:Yc<  
{ Xi`K`Cu+  
 if(hHook!=NULL){ }DiMt4!ZC!  
  nHookCount++; 9B gR@b  
  return TRUE; QQ^P IQj  
 } v?Q&06PMRc  
 else -:]_DbF  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); M:i;;)cq  
  if(hHook!=NULL) swEE >=  
   nHookCount++; QyN<o{\FD!  
  return (hHook!=NULL); <Uf?7  
} ^"N]i`dIF  
BOOL UnInit() W=j  
{ H.#<&5f  
 if(nHookCount>1){ R@_i$Df|  
  nHookCount--; |c,,*^  
  return TRUE;  uaN0X"  
 } iX,| ;J|]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v.Wkz9 w}  
 if(unhooked==TRUE){ w4w[qxV>  
  nHookCount=0; GqB]^snh  
  hHook=NULL; t_cNH@^3<3  
 } !*#2~$:  
 return unhooked; I[u%k ir  
} G`3/${ti  
AB92R/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HAJK%zLc  
{ $A"C1)d;  
 BOOL bAdded=FALSE; t/xWJW2  
 for(int index=0;index<MAX_KEY;index++){ ^ 'W<|  
  if(hCallWnd[index]==0){  vU(2[  
   hCallWnd[index]=hWnd; <pzCpF<  
   HotKey[index]=cKey; /~RY{ c@#L  
   HotKeyMask[index]=cMask; _)AX/%^%  
   bAdded=TRUE; ##Jg>HL'  
   KeyCount++; xfYDjf :<  
   break; %DH2]B? 0  
  } e%_2n=p~)%  
 } RQ}0f5~t  
 return bAdded; 6Ap-J~4  
} kOi@QLdN  
BVAxeXO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (/6~*<ZGT  
{ k$j4~C'$  
 BOOL bRemoved=FALSE; Kxs_R#k  
 for(int index=0;index<MAX_KEY;index++){ >6xZF'4  
  if(hCallWnd[index]==hWnd){ >drG,v0qh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }',/~T6  
    hCallWnd[index]=NULL; "`;$wA  
    HotKey[index]=0; ;VVKn=X=S=  
    HotKeyMask[index]=0; $mf Z{  
    bRemoved=TRUE; `a *_b9  
    KeyCount--; 7OSk0%Q,  
    break; -DWyKR= j"  
   } ;A^Ii>`  
  } t2V|moG  
 } w Q!C9Gp3e  
 return bRemoved; ,ru2C_LQ  
} PX7@3Y  
X)P;UVR0  
void VerifyWindow() [N] 5)n  
{ l\+^.ezD  
 for(int i=0;i<MAX_KEY;i++){ )bCw~'h*  
  if(hCallWnd!=NULL){ @APv?>$)  
   if(!IsWindow(hCallWnd)){ Ll 4/P[7:?  
    hCallWnd=NULL; $H}G'LqiG  
    HotKey=0; [1Cs  
    HotKeyMask=0; 4KH8dau.fF  
    KeyCount--; .;),e#  
   } ']]C zze  
  } N$cm;G=]  
 } fGK=lT$  
} /K!&4mK  
UEkn@^&bg  
BOOL CHookApp::InitInstance() K ?R* )_  
{ ep|>z#1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6k569c{7  
 hins=AfxGetInstanceHandle(); v D"4aw  
 InitHotkey(); RRXnj#<g  
 return CWinApp::InitInstance(); -|Z[GN:  
} V5ve  
ST'eJ5P7!5  
int CHookApp::ExitInstance() ^ud-N;]MKs  
{ T'W)RYnwl  
 VerifyWindow(); ,0j7qn@tm  
 UnInit(); =rH' \7T  
 return CWinApp::ExitInstance(); dXwfOC\\  
} H[H+s!)"  
+MHsdeGU1W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _>:R]2Ew  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &`]Lg?J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DjzHEqiH  
#if _MSC_VER > 1000 a| w.G "W  
#pragma once W8bh49   
#endif // _MSC_VER > 1000 Vr%>'XN>"  
hDPZj#(c  
class CCaptureDlg : public CDialog >"Tivc5  
{ -L zx3"  
 // Construction tsGt,]O30  
 public: h!@t8R  
  BOOL bTray; GPyr;FV!s  
  BOOL bRegistered; K'/,VALp  
  BOOL RegisterHotkey(); S_ELZO#7  
  UCHAR cKey; c)L1@qdZ  
  UCHAR cMask; NOzAk%s3I  
  void DeleteIcon(); ,tZJSfHB  
  void AddIcon(); WD`z\{hcom  
  UINT nCount; 45?aV@  
  void SaveBmp(); 'r/+z a:2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]6)~Sj$ 5  
  // Dialog Data WR5@S&fU`  
  //{{AFX_DATA(CCaptureDlg) $9~6M*  
  enum { IDD = IDD_CAPTURE_DIALOG }; H YA<  
  CComboBox m_Key; _BC%98:WP  
  BOOL m_bControl; ,}8|[)"  
  BOOL m_bAlt; )\xDo<@  
  BOOL m_bShift; >0^oC[ B  
  CString m_Path; \:7G1_o  
  CString m_Number; n:TWZ.9  
  //}}AFX_DATA r2t|,%%N7  
  // ClassWizard generated virtual function overrides 9V]{q  
  //{{AFX_VIRTUAL(CCaptureDlg) Vn7FbaO^  
 public: E2hy%y9Tp  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *#{V ^}  
 protected: \Uz7ar#,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d3,%Z &  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~tw#Q  
  //}}AFX_VIRTUAL |8m2i1XG  
  // Implementation D]P_tJI  
 protected: 7,^.h<@K  
  HICON m_hIcon; O6 :GE'S  
  // Generated message map functions lMn1e6~K  
  //{{AFX_MSG(CCaptureDlg) h vC gd^M  
  virtual BOOL OnInitDialog(); KR49Y>s<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); d9qA\ [  
  afx_msg void OnPaint(); cPx] :sC  
  afx_msg HCURSOR OnQueryDragIcon(); s|cL mL[  
  virtual void OnCancel(); k'(d$;Jgr  
  afx_msg void OnAbout(); &"_5?7_N  
  afx_msg void OnBrowse(); v@qU<\Y>  
  afx_msg void OnChange(); ;$il_xA)\>  
 //}}AFX_MSG aAT!$0H  
 DECLARE_MESSAGE_MAP() CC,f*I  
}; +VE ] .*T  
#endif { /u}  
qD] &&"B  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Exu5|0AAE  
#include "stdafx.h" }=7? & b  
#include "Capture.h" 2:8p>^g=  
#include "CaptureDlg.h" CyHaFUbZ  
#include <windowsx.h> _NwB7@ e  
#pragma comment(lib,"hook.lib") D#8uj=/%  
#ifdef _DEBUG ^yl)c \`  
#define new DEBUG_NEW $vC}Fq  
#undef THIS_FILE ^8z~`he=_J  
static char THIS_FILE[] = __FILE__; p?6`mH  
#endif EFk9G2@_  
#define IDM_SHELL WM_USER+1 ,NA _pvH)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I1Jhvyd?$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6Fe$'TP  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ` !um )4  
class CAboutDlg : public CDialog i 6DcLE  
{ _ Vo35kA  
 public: g)L?C'BG  
  CAboutDlg(); ZcQ@%XY3~  
  // Dialog Data bJWPr  
  //{{AFX_DATA(CAboutDlg) L-,C5^  
  enum { IDD = IDD_ABOUTBOX }; }Dc7'GZ  
  //}}AFX_DATA w>TlM*3D/  
  // ClassWizard generated virtual function overrides Zf,9 k".'C  
  //{{AFX_VIRTUAL(CAboutDlg) rBLcj;,  
 protected: uE;bNs'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o<\u Hr3  
  //}}AFX_VIRTUAL ua8Burl7  
  // Implementation )%(V.?eW  
 protected: Q7{/ T0  
  //{{AFX_MSG(CAboutDlg) X<8   
  //}}AFX_MSG O8mmS!  
  DECLARE_MESSAGE_MAP() O]1aez[  
}; -Uj3?W  
x("V +y*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1SwKd*aRR?  
{ phc9esz  
 //{{AFX_DATA_INIT(CAboutDlg) JNx;/6'd,  
 //}}AFX_DATA_INIT 3~ptD5@WF  
} ^sP-6 ^  
"<=HmE-;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |jhu  
{ m\DI6O"u'  
 CDialog::DoDataExchange(pDX); \Ctl(uj  
 //{{AFX_DATA_MAP(CAboutDlg) Vx#n0z  
 //}}AFX_DATA_MAP UVUoXv)N  
} ,ozgnhZY  
eKv{N\E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u$MXO].Q  
 //{{AFX_MSG_MAP(CAboutDlg) 4\pUA4  
 // No message handlers Tw]].|^f-  
 //}}AFX_MSG_MAP n#dvBK0M  
END_MESSAGE_MAP() t/KH`  
ETMF.-P  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "oLY";0(=  
: CDialog(CCaptureDlg::IDD, pParent) AEw~LF2w  
{ T4e-QEH  
 //{{AFX_DATA_INIT(CCaptureDlg) IwZe2$f  
  m_bControl = FALSE; $:u5XJx  
  m_bAlt = FALSE; <fm<UO,%  
  m_bShift = FALSE; D\LXjEm e.  
  m_Path = _T("c:\\"); mh :eUFe  
  m_Number = _T("0 picture captured."); ^!j,d_)b!  
  nCount=0; ui!MQk+D9  
  bRegistered=FALSE; n]< >$  
  bTray=FALSE; Xf/qUao  
 //}}AFX_DATA_INIT _Z0O]>KH  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #[ TOe  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]7/6u.G7R  
} mNDd>4%H_  
*f*o ,~8V1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \-nbV#{  
{ 1R"?X'w  
 CDialog::DoDataExchange(pDX); H]<@\g*l@P  
 //{{AFX_DATA_MAP(CCaptureDlg) >J['so2Bf  
  DDX_Control(pDX, IDC_KEY, m_Key); RK\$>KFE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); nN*:"F/^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); av:9kPKm  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `;v5o4.`  
  DDX_Text(pDX, IDC_PATH, m_Path); Xt$o$V  
  DDX_Text(pDX, IDC_NUMBER, m_Number); C#tY};t  
 //}}AFX_DATA_MAP 277Am*2  
} hTS?+l  
[39  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [R%Pf/[Fr  
//{{AFX_MSG_MAP(CCaptureDlg) Ra-%,cS  
 ON_WM_SYSCOMMAND() RKtU@MX49  
 ON_WM_PAINT() .DN)ck:e;  
 ON_WM_QUERYDRAGICON() Y| 2Gj(*8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 5m\T~[`%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +m]Kj3-z@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ;+NU;f/WM  
//}}AFX_MSG_MAP fZNWJo# `.  
END_MESSAGE_MAP() %VsIg  
NA-)7i*>J  
BOOL CCaptureDlg::OnInitDialog() ^E}};CsT  
{ LmjzH@3  
 CDialog::OnInitDialog(); ;cfmMt!QWJ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); aS)Gj?Odf  
 ASSERT(IDM_ABOUTBOX < 0xF000); W*jwf@ 0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4lsg%b6_%,  
 if (pSysMenu != NULL) 3?Tk[m1b  
 { rL3 f%L  
  CString strAboutMenu; M # ) @!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .j l|? o  
  if (!strAboutMenu.IsEmpty())  X0&[cyP!  
  { D%,AdR"m  
   pSysMenu->AppendMenu(MF_SEPARATOR); fKQq]&~ H  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n~C!PXE  
  } "qxu9Hg!  
 } ;RW0 24  
 SetIcon(m_hIcon, TRUE); // Set big icon N~0~1 WQn  
 SetIcon(m_hIcon, FALSE); // Set small icon KL^hYjC  
 m_Key.SetCurSel(0); '\4 @  
 RegisterHotkey(); q-5U,!!W/  
 CMenu* pMenu=GetSystemMenu(FALSE); E,$5 V^ 9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6ntduXeNVh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); g|V md  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); HTw7l]]  
 return TRUE; // return TRUE unless you set the focus to a control kY.3x# w  
} *c{X\!YBh  
M_Z(+k{Gy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %D $+Z(  
{ %[J|n~8_Z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /AhN$)(O  
 { Api<q2@R  
  CAboutDlg dlgAbout; us$=)m~v+  
  dlgAbout.DoModal(); 's7 (^1hH  
 } {6Qd,CX  
 else ! 1wf/C;=  
 { I] vCra  
  CDialog::OnSysCommand(nID, lParam); 0k):OVfm=  
 } :o=a@Rqx  
} TW)~&;1l  
j _p|>f<}  
void CCaptureDlg::OnPaint() 2PVtyV3;  
{ &vHfuM`  
 if (IsIconic()) $CP_oEb  
 { T(4OPiKu  
  CPaintDC dc(this); // device context for painting A2{s ?L,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [)KLmL%  
  // Center icon in client rectangle u~\I  
  int cxIcon = GetSystemMetrics(SM_CXICON); s$PPJJT{b  
  int cyIcon = GetSystemMetrics(SM_CYICON); XPd@>2  
  CRect rect; WB(Gx_o3  
  GetClientRect(&rect); \9 5O  
  int x = (rect.Width() - cxIcon + 1) / 2; Qs1e0LwA9  
  int y = (rect.Height() - cyIcon + 1) / 2; lq*{2M{[  
  // Draw the icon EI!e0 V1!  
  dc.DrawIcon(x, y, m_hIcon); f.Feo  
 } /+zzZnLl-M  
 else 7%F8  
 { 6>R|B?I%  
  CDialog::OnPaint(); 9aKt (g6  
 } c2fqueK|:W  
} ml\2%07  
,,o5hD0V9  
HCURSOR CCaptureDlg::OnQueryDragIcon() MbJ|6g99  
{ Jh!'"7  
 return (HCURSOR) m_hIcon; pon0!\ZT=  
} wr{ [4$O  
K! e51P  
void CCaptureDlg::OnCancel() ,'c?^ $J|z  
{ iciw 54;4  
 if(bTray) %FSY}65  
  DeleteIcon(); -ttH{SslM  
  CDialog::OnCancel(); 9:1[4o)~  
} ~ u',Way  
Tn"/EO^N  
void CCaptureDlg::OnAbout() lk`,s  
{ ),;O3:n  
 CAboutDlg dlg; 8DO3L "  
 dlg.DoModal(); 3,[#%}1(S  
} f\]splL  
`%nj$-W:  
void CCaptureDlg::OnBrowse() hH])0C  
{ &m8Z3+Ea  
 CString str; D g~L"  
 BROWSEINFO bi; dub %fs  
 char name[MAX_PATH]; [44C`x[8M+  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  V9cKl[  
 bi.hwndOwner=GetSafeHwnd(); =}^J6+TVL  
 bi.pszDisplayName=name; 4ht+u  
 bi.lpszTitle="Select folder"; RI</T3%~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +q-/~G'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); K]s*rPT/,  
 if(idl==NULL) ,"U_oa3  
  return; Eu)(@,]we  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }=T=Z#OgH  
 str.ReleaseBuffer(); `iT{H]po  
 m_Path=str; IyJHKDFk  
 if(str.GetAt(str.GetLength()-1)!='\\') nlsif  
  m_Path+="\\"; ~]LkQQ'  
 UpdateData(FALSE); 8\])p sb9  
} 6tKCY(#oO+  
>jH%n(TcC  
void CCaptureDlg::SaveBmp() h-+GS%  
{ ~f5g\n;  
 CDC dc; E Zh.*u@^r  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #BLmT-cl  
 CBitmap bm; 75?z" i  
 int Width=GetSystemMetrics(SM_CXSCREEN); H\!p%Y  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~P;KO40K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); m&!4*D  
 CDC tdc; RP|/rd]-k  
 tdc.CreateCompatibleDC(&dc); \#O}K  
 CBitmap*pOld=tdc.SelectObject(&bm); guc[du  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [ :*Jn}  
 tdc.SelectObject(pOld); 8AgKK=C =  
 BITMAP btm; kD.KZV  
 bm.GetBitmap(&btm); jSc!"Trl]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bxR6@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); BfOQ/k))  
 BITMAPINFOHEADER bih; H)VzPe#{  
 bih.biBitCount=btm.bmBitsPixel; NuQ l  
 bih.biClrImportant=0; <)am]+Lswy  
 bih.biClrUsed=0; ;2\+O"}4H  
 bih.biCompression=0; /.m &rS  
 bih.biHeight=btm.bmHeight; 6! .nj3$*  
 bih.biPlanes=1; HJ^SqSm  
 bih.biSize=sizeof(BITMAPINFOHEADER); yNU.<d 5  
 bih.biSizeImage=size; i$ CN{c*  
 bih.biWidth=btm.bmWidth; 7>,(QHl  
 bih.biXPelsPerMeter=0; o.|P7{v}  
 bih.biYPelsPerMeter=0; uzgQ_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JDp{d c  
 static int filecount=0; pB0p?D)n  
 CString name; O~~WP*N  
 name.Format("pict%04d.bmp",filecount++); RF$2p4=[  
 name=m_Path+name; |X6/Y@N  
 BITMAPFILEHEADER bfh; vv0+F6 @  
 bfh.bfReserved1=bfh.bfReserved2=0; Nt'6Y;m!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ckhU@C|=*  
 bfh.bfSize=54+size; E 8LA+dKN:  
 bfh.bfOffBits=54; F(}~~EtPHo  
 CFile bf; ;:DDz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QMAineO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2/F";tc\'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); i&_&4  
  bf.WriteHuge(lpData,size);  TG^?J`  
  bf.Close(); B/F6WQdZ  
  nCount++; -'%>Fon  
 } F)n^pT  
 GlobalFreePtr(lpData); g:rjt1w`D  
 if(nCount==1) F :p9y_W  
  m_Number.Format("%d picture captured.",nCount); =&~7Q"  
 else 9S_PZH  
  m_Number.Format("%d pictures captured.",nCount); vOQ 3A%/  
  UpdateData(FALSE); l2Pry'3  
} aP&bW))CI  
8gn12._x  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d.3cd40Q  
{ @]F1J  
 if(pMsg -> message == WM_KEYDOWN) l.nd Wv  
 { o7i>D6^^  
  if(pMsg -> wParam == VK_ESCAPE) 5x?YFq6k  
   return TRUE; xmXuBp:M(R  
  if(pMsg -> wParam == VK_RETURN) w _ONy9  
   return TRUE; bo|3sN+D  
 } w]O [{3"  
 return CDialog::PreTranslateMessage(pMsg); 1Xn:B_pP  
} ` G- V %  
>h3m/aeNC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZULnS*V;5  
{ iO@UzD #v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ RzOcz=A}  
  SaveBmp(); tN1xZW:  
  return FALSE; zN3b`K. i  
} L'L[Vpx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !YVGT <  
 CMenu pop; -~] q?k?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A~)#  
 CMenu*pMenu=pop.GetSubMenu(0); AC&)FY  
 pMenu->SetDefaultItem(ID_EXITICON); %iR"eEE  
 CPoint pt; fK{m7?V  
 GetCursorPos(&pt); Em ;2fh  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )eD9H*mq  
 if(id==ID_EXITICON) (J 1:J  
  DeleteIcon(); 'B\7P*L"p  
 else if(id==ID_EXIT) f Hd|tl  
  OnCancel(); VS jt|F)t  
 return FALSE; cMK}BHOC  
} U-U"RC>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); /P%OXn$i/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) w&[&ZDsK  
 AddIcon(); ISHzlEY  
 return res; iu.v8I ;<  
} B? Z_~Bf&  
9T#${NK  
void CCaptureDlg::AddIcon() %EH{p@nM&-  
{ ^V7'S<  
 NOTIFYICONDATA data; |}><)}  
 data.cbSize=sizeof(NOTIFYICONDATA); NH'Dz6K5  
 CString tip; zvbO q  
 tip.LoadString(IDS_ICONTIP); bY UG4+rD  
 data.hIcon=GetIcon(0); \k 6'[ln  
 data.hWnd=GetSafeHwnd(); H):(8/> (  
 strcpy(data.szTip,tip); %WF]mF T_  
 data.uCallbackMessage=IDM_SHELL; ,n3e8qd  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _J"fgxW  
 data.uID=98; aY-7K._</  
 Shell_NotifyIcon(NIM_ADD,&data); 6o d^+>U  
 ShowWindow(SW_HIDE); PC!g?6J  
 bTray=TRUE; y|/[;  
} 1I?`3N  
2h:{6Gq8  
void CCaptureDlg::DeleteIcon() D/YMovH%  
{ i_e%HG  
 NOTIFYICONDATA data; Dv"HFQuF  
 data.cbSize=sizeof(NOTIFYICONDATA); oJ?,X^~_  
 data.hWnd=GetSafeHwnd(); < Dt/JA(p  
 data.uID=98; BUS4 T#D  
 Shell_NotifyIcon(NIM_DELETE,&data); = glF6a  
 ShowWindow(SW_SHOW); V}X>~ '%  
 SetForegroundWindow(); *3\*GatJ  
 ShowWindow(SW_SHOWNORMAL); =Hbf()cN)  
 bTray=FALSE; *7o@HBbF  
} w ZfY~  
Z`<5SHQd  
void CCaptureDlg::OnChange() bH.SUd)  
{ UZpQ%~/  
 RegisterHotkey(); 3 <)+)n  
} Z 4QL&?U  
Ao+6^z_  
BOOL CCaptureDlg::RegisterHotkey() R} X"di  
{ k8c(|/7d  
 UpdateData(); jwpahy;\WL  
 UCHAR mask=0; H<") )EJI  
 UCHAR key=0; v{SZ(;  
 if(m_bControl) uJ`:@Z^J  
  mask|=4; ua E,F^p  
 if(m_bAlt) rf+Z0C0WYi  
  mask|=2; hdeI/4 B  
 if(m_bShift) `ZU]eAV  
  mask|=1; iNr&;  
  key=Key_Table[m_Key.GetCurSel()]; ,N1pww?  
 if(bRegistered){ ~)pso7^:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); N[A9J7}_R  
  bRegistered=FALSE; ,bzC| AK  
 } IIN,Da;hD  
 cMask=mask; ,T*\9' Q  
 cKey=key; ,_ TE@ ]!$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6 2#@Y-5  
 return bRegistered; L*OG2liJ  
} bFhZSk )  
"U!Vdt2vp  
  四、小结 =~k}XB  
#(QS5J&Qq  
  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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