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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: vKDRjrF-  
  _5.^A&Y*  
  一、实现方法 5FnWlFc  
z:|4S@9  
  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: Uw5z]Jck  
&?/h#oF@\  
#pragma data_seg("shareddata") #Z}\;a{vZ  
HHOOK hHook =NULL; //钩子句柄 ju(&v*KA  
UINT nHookCount =0; //挂接的程序数目 h{yqNl  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  s6 w</  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4)-LlYS_d<  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;p/RS#  
static int KeyCount =0; G1vWHa7n;f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >tqLwC."'  
#pragma data_seg() Ezm ~SY  
MV H^["AeR  
  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。 d5%A64?  
"MKgU[t  
  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: q.t>:`  
0eQyzn*98  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ykxjT@[  
cKey,UCHAR cMask) ]0zXpMNI  
{ ?z171X0  
 BOOL bAdded=FALSE;  s6rdQI]  
 for(int index=0;index<MAX_KEY;index++){ M/ 0!B_(R  
  if(hCallWnd[index]==0){ P8Fq %k  
   hCallWnd[index]=hWnd; EMmNlj6  
   HotKey[index]=cKey; 1[a;2x A~  
   HotKeyMask[index]=cMask; b"t!nfgo  
   bAdded=TRUE; $VhUZGuG>  
   KeyCount++; ,;'9PsIS^  
   break; v}IkY  
  } { o=4(RC  
 } A /,7%bB1  
 return bAdded; wZ,9~P 7  
} ^vLHs=<  
//删除热键 q[nX<tO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .KGW#Qk8  
{ _+S`[:;a  
 BOOL bRemoved=FALSE; O$E3ry+?  
 for(int index=0;index<MAX_KEY;index++){ ^UZEdR;  
  if(hCallWnd[index]==hWnd){ KO<Yc`Fs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H ZIJKk(  
    hCallWnd[index]=NULL; 3lqR(Hh3  
    HotKey[index]=0; V{O,O,*  
    HotKeyMask[index]=0; .%h.b6^  
    bRemoved=TRUE; B9/x?Jv1  
    KeyCount--; '%yWz)P  
    break; s@E "EWp0  
   } X5cl'J(j9  
  } bBc<yaN  
 } 0R >M_|  
 return bRemoved; [iwn"e  
} [bIdhG  
M])Y|}wv8  
((\s4-   
  DLL中的钩子函数如下: 81fpeoNO  
G%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) En&ESW N  
{ Pq>r|/~_  
 BOOL bProcessed=FALSE; {v}f/ cu  
 if(HC_ACTION==nCode) o> WH;EBL  
 { 8xs[{?|:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .vj`[?T  
   switch(wParam) S " R]i  
   {  PGsXB"k<8  
    case VK_MENU: iE, I\TY[  
     MaskBits&=~ALTBIT; r ioNP(  
     break; .dt7b4.kd  
    case VK_CONTROL: #Sr_PEo _  
     MaskBits&=~CTRLBIT; E'?yI' ~=  
     break; t?L;k+sMM  
    case VK_SHIFT: %kS+n_*  
     MaskBits&=~SHIFTBIT; U,yU-8z/  
     break; $(H%|Oyn  
    default: //judge the key and send message 2K'3ry)[y  
     break; [h+MA>%!  
   } ZWQrG'$?o8  
   for(int index=0;index<MAX_KEY;index++){ k]!Fh^O~,  
    if(hCallWnd[index]==NULL) r9sW:cM:e  
     continue; \Y_2Z /  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jxU1u"WU  
    { %Wkvo-rOq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;t{Ew+s  
     bProcessed=TRUE; dFFJw[$8w  
    } nR-`;lrF~  
   } Mdsn"Y V  
  } MU4/arXy  
  else if((lParam&0xc000ffff)==1){ //有键按下 m{  .'55  
   switch(wParam) (ec?_N0=  
   { abh='5H|^|  
    case VK_MENU: .p  NWd  
     MaskBits|=ALTBIT; <UOx>=h  
     break; <[ />M  
    case VK_CONTROL: Z|K+{{C  
     MaskBits|=CTRLBIT; 5:6as^i:b  
     break; v*SSc5gFG  
    case VK_SHIFT: AA"?2dF  
     MaskBits|=SHIFTBIT; obKWnet  
     break; 9bR lSb@  
    default: //judge the key and send message U:ggZ`.  
     break; 0f}zm8p7.  
   } NBuibL  
   for(int index=0;index<MAX_KEY;index++){ 1{i)7 :Y  
    if(hCallWnd[index]==NULL) Kv^ez%I  
     continue; fNNkc[YTZI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^I=c]D]);  
    { !qsk;Vk7Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s!esk%h{K  
     bProcessed=TRUE; !'o5X]s  
    } XW w=3$  
   } '^)Ve:K-.  
  } w?)v#]<-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6ziiV _p  
   for(int index=0;index<MAX_KEY;index++){ l2QO\O I9m  
    if(hCallWnd[index]==NULL) ]fvU}4!  
     continue; 4nQk*:p(X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i_Dv+^&zV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pXf!8X&y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ZqT?7|i  
   } 4bLk+EY4A  
  } SIv8EMGo  
 } "jqC3$DKI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^-?5=\`5  
} S=H<5*]g  
++n"` ]o,  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 6nqG;z-IXJ  
2\h}6DGx2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .V G$`g"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kY*3)KCp  
,S 5tkTa  
  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: M24FuS  
V9[-# Ti  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k>y68_  
{ =r=[e}&9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Pz#D9.D0  
 { eSo/1D  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [,[;'::=o4  
  SaveBmp(); }6ObQa43   
  return FALSE; Rp$t;=SMD  
 } MF:]J  
 …… //其它处理及默认处理 VN`T:!&  
} =!u9]3)  
Tap=K|b ]  
b* Ny  
  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。  $0>>Z  
,_;+H*H>"  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 l^aG"")TH.  
RzCC>-  
  二、编程步骤 rI34K~ P  
zK`fX  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 4np,"^c  
#RAez:BI  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?w6zq|  
w@RVg*`%7D  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; kx,9n)  
VeK^hz R^Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; GyI(1O AW  
"8MG[$Y  
  5、 添加代码,编译运行程序。 ^2Sa_.  
B;xw @:H  
三、程序代码 <tkxE!xF`J  
AffVah2o:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL B;Pws$J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W:D'k^u  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^9*FYV  
#if _MSC_VER > 1000 EWuuNf  
#pragma once xxxM  
#endif // _MSC_VER > 1000 0sq?;~U  
#ifndef __AFXWIN_H__ 3Mw\}q  
#error include 'stdafx.h' before including this file for PCH ^.bYLF  
#endif Zwy8 SD'L  
#include "resource.h" // main symbols Sh'>5z2  
class CHookApp : public CWinApp rmpx8C Y"  
{ k8fvg4  
 public: o=i)s2   
  CHookApp(); +E8 \g  
  // Overrides )6mx\t  
  // ClassWizard generated virtual function overrides 8 tq6.%\  
  //{{AFX_VIRTUAL(CHookApp) f1GV6/| m  
 public: <L|eY(:  
  virtual BOOL InitInstance(); s/[15  
  virtual int ExitInstance(); 0tbximmDb  
  //}}AFX_VIRTUAL i*3 4/  
  //{{AFX_MSG(CHookApp) :&D>?{b0  
  // NOTE - the ClassWizard will add and remove member functions here. |Y' xtOMX  
  // DO NOT EDIT what you see in these blocks of generated code ! U 7mA~t2E  
  //}}AFX_MSG mNkS!(L6  
  DECLARE_MESSAGE_MAP() L B`=+FD  
}; }G^Bc4@b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 0CXh|AU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p\lS ) 9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S%KY%hUt  
BOOL InitHotkey(); *p!K9$4  
BOOL UnInit(); bz!9\D|h  
#endif hKq <e%oVH  
W\09h Z6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^]mwL)I}  
#include "stdafx.h" tln*Baq  
#include "hook.h" vd7%#sHH&  
#include <windowsx.h> { ?p55o  
#ifdef _DEBUG !(\OT  
#define new DEBUG_NEW 'VA\dpa{J  
#undef THIS_FILE ""`> v`\  
static char THIS_FILE[] = __FILE__; e*5TZ7.  
#endif =Ny&`X#F  
#define MAX_KEY 100 zA+&V7bvy  
#define CTRLBIT 0x04 nLK%5C  
#define ALTBIT 0x02 L \0nO i  
#define SHIFTBIT 0x01 WBTdQG Q6  
#pragma data_seg("shareddata") <3\t J  
HHOOK hHook =NULL; $47cKit|k:  
UINT nHookCount =0; \(UEjlo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey GCx1lm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Jp)>Wd  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 'Y23U7 n0B  
static int KeyCount =0; hpJ[VKe  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift MGn:Gj"d  
#pragma data_seg() O+Z[bis`  
HINSTANCE hins; h%e}4U@X  
void VerifyWindow(); yjCY2T E  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9G(.=aOj,  
//{{AFX_MSG_MAP(CHookApp) Hb&-pR@e\?  
// NOTE - the ClassWizard will add and remove mapping macros here. `_{'qqRhe  
// DO NOT EDIT what you see in these blocks of generated code! sW%U3,j  
//}}AFX_MSG_MAP S<^*jheO5  
END_MESSAGE_MAP() )W^Wqa8mG|  
,aI 6P-  
CHookApp::CHookApp() #;. tVo I  
{ F5Ce:+h  
 // TODO: add construction code here, xR5jy|2JJ  
 // Place all significant initialization in InitInstance $-""=O|"   
} ~7PPB|XY  
w-Zb($_  
CHookApp theApp; }N; c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :32  
{ M ,.++W\  
 BOOL bProcessed=FALSE; 9:0JWW^so  
 if(HC_ACTION==nCode) yO Cv-zm  
 { `X?l`H;#  
  if((lParam&0xc0000000)==0xc0000000){// Key up %XGwQB$zk8  
   switch(wParam) IQ$l!)  
   { Nx4_Oc^hY  
    case VK_MENU: PN0l#[{EN  
     MaskBits&=~ALTBIT; N*JWd  
     break; WE$Pi;q1  
    case VK_CONTROL: w?kdM1T  
     MaskBits&=~CTRLBIT; Zcd!y9]#  
     break; 31mY]Jve"  
    case VK_SHIFT: pE >~F  
     MaskBits&=~SHIFTBIT; U+sAEN_e k  
     break; O?Xg%k#  
    default: //judge the key and send message Z[8{V  
     break; pKO\tkMJ  
   } vG WX=O  
   for(int index=0;index<MAX_KEY;index++){ Y604peUF  
    if(hCallWnd[index]==NULL) k!E`Xeob  
     continue; SPA_a\6_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A S;ra,x  
    { q[]EVs0$ew  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (1\!6  
     bProcessed=TRUE; jM1|+o*Wr  
    } $5nOiaQL  
   } rly3f  
  } Q%4>okj,  
  else if((lParam&0xc000ffff)==1){ //Key down ) ^PY-~o[  
   switch(wParam) aE.T%xR  
   { !!f)w!wW  
    case VK_MENU: 7 ]a6dMh  
     MaskBits|=ALTBIT; R:YX{Tq  
     break; !]q wRB$5  
    case VK_CONTROL: CD1}.h  
     MaskBits|=CTRLBIT; Ty\&ARjb 8  
     break; Nb\4Mv`  
    case VK_SHIFT: A"`6 2  
     MaskBits|=SHIFTBIT; h$|K vS  
     break; xin<.)!E  
    default: //judge the key and send message (A`/3Aq+  
     break; M$A"<5  
   } 1fwCQM   
   for(int index=0;index<MAX_KEY;index++) e $QX?y .  
   { $A6'YgK  
    if(hCallWnd[index]==NULL) VR5$[-E3  
     continue; $Hqm 09w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S:{hgi,T*  
    { [r_,BH\nu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m *8[I  
     bProcessed=TRUE; O?NAbxkp  
    } lwPK^)|}  
   } I"*g-ji0  
  } /HH5Mn*  
  if(!bProcessed){ (qHI>3tpY  
   for(int index=0;index<MAX_KEY;index++){ T#?KY  
    if(hCallWnd[index]==NULL) {y=H49  
     continue; oz%ZEi \bW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "XMTj <D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N8:?Z#z  
   } nU%rSASu  
  } [(}f3W&  
 } 6 grJoim|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tUv@4<~,/  
} t`03$&Cx7  
rs2~spN;h  
BOOL InitHotkey() %stZ'IX  
{ a?E]-Zf  
 if(hHook!=NULL){ ?sDm~]Z  
  nHookCount++; 6N\~0d>5m  
  return TRUE; L <]j&  
 } D:'|poH  
 else 34U/"+|z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /78gXHv  
  if(hHook!=NULL) ')I/D4v  
   nHookCount++; My'M ~#kO,  
  return (hHook!=NULL); & PrV+Lv  
} =K{$?%"  
BOOL UnInit() YFOK%7K  
{ -QCo]:cp  
 if(nHookCount>1){ Z'<=06  
  nHookCount--; ^*'|(Cv  
  return TRUE; j#y_#  
 } z^I"{eT8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Qpiv,n  
 if(unhooked==TRUE){ wcP0PfY  
  nHookCount=0; ~ C6< 75  
  hHook=NULL; C,z7f"  
 } EaFd1  
 return unhooked; `zRgP#  
} ja70w:ja  
MX6*waQ-<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <M=U @  
{ cH'*J/  
 BOOL bAdded=FALSE; F%bv vw*(  
 for(int index=0;index<MAX_KEY;index++){ 8dq{.B?  
  if(hCallWnd[index]==0){ 01 6l$K4  
   hCallWnd[index]=hWnd; /L'm@8  
   HotKey[index]=cKey; ;r>?V2,tm  
   HotKeyMask[index]=cMask; ui`xgR\6Rh  
   bAdded=TRUE; =1)yI>2e%}  
   KeyCount++; 3SVI|A5(d  
   break; O\pqZ`E=s  
  } kmNY ;b6Y$  
 } nCh9IF[BL/  
 return bAdded; p=\DZU~1  
} 4?g~GI3  
z|F>+6l"Y7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tc\LK_@$/F  
{ j{>E.F2.  
 BOOL bRemoved=FALSE; 8^&)A b  
 for(int index=0;index<MAX_KEY;index++){ lF5;K c  
  if(hCallWnd[index]==hWnd){ B o.x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I:u xj%  
    hCallWnd[index]=NULL; F}<&@7kF  
    HotKey[index]=0; D}px=?  
    HotKeyMask[index]=0; n_AW0i .  
    bRemoved=TRUE; Y1+4ppZ  
    KeyCount--; ygS*))7 r  
    break; $$<9tqA  
   } SG |!wH^  
  } t*zve,?}  
 } N+\#k*n?  
 return bRemoved; 7xB#)o53  
} QE)I7(  
IJxdbuKg  
void VerifyWindow() *pw:oTO  
{ )FT~gl%  
 for(int i=0;i<MAX_KEY;i++){ 5H:NY|  
  if(hCallWnd!=NULL){ -]~U_J]  
   if(!IsWindow(hCallWnd)){ >pO[ S[  
    hCallWnd=NULL; j\q1b:pE  
    HotKey=0; ?*K;+@EH  
    HotKeyMask=0; f'\I52;FB  
    KeyCount--; {}N*e"<O  
   } wJ1qJ!s@  
  } lg&"=VXx51  
 } =r3Yt9  
} !;pmql  
V%dMaX>^i  
BOOL CHookApp::InitInstance() LPb43  
{ FT/H~|Z>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Dd<gYPC  
 hins=AfxGetInstanceHandle(); ] $$ciFM  
 InitHotkey(); -WE pBt7*  
 return CWinApp::InitInstance(); m@.4Wrv  
} #l2wF>0  
f,d @*E  
int CHookApp::ExitInstance()  S&]+r<  
{ 35) ]R`f  
 VerifyWindow(); dwv xV$Nt  
 UnInit(); #p&iH9c_  
 return CWinApp::ExitInstance(); 91E!4t}I  
} e%`gD*8  
VvSD &r^qI  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6S])IA&VJ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Xp1xhb*^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Zg5@l3w  
#if _MSC_VER > 1000 M7Cq)cT  
#pragma once :35J<oG  
#endif // _MSC_VER > 1000 .^I,C!O#  
u]@``Zb|  
class CCaptureDlg : public CDialog 8^\DQ&D  
{ '|':W6m,  
 // Construction YTL [z:k}  
 public: Cq !VMl>hP  
  BOOL bTray; 8II-'%S6q  
  BOOL bRegistered; -0YS$v%au>  
  BOOL RegisterHotkey(); 0@C`QW%m  
  UCHAR cKey; g % q7  
  UCHAR cMask; ppN96-]^0  
  void DeleteIcon(); 3T# zxu  
  void AddIcon(); Ayc}uuu  
  UINT nCount; }/x `w  
  void SaveBmp(); a ^iefwsNc  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %((F} 9_6  
  // Dialog Data 3*CF!Y%  
  //{{AFX_DATA(CCaptureDlg) & oZI. Qeo  
  enum { IDD = IDD_CAPTURE_DIALOG }; h\Op|#gIT  
  CComboBox m_Key; ']u w,b  
  BOOL m_bControl; Y gQ_P4B;  
  BOOL m_bAlt; } !pC}m  
  BOOL m_bShift; RSG4A>%!mI  
  CString m_Path; g (ZeGNV8  
  CString m_Number; =4\|'V15  
  //}}AFX_DATA K*'(;1AiW  
  // ClassWizard generated virtual function overrides 2[[ pd&MJZ  
  //{{AFX_VIRTUAL(CCaptureDlg) }KCXo/y  
 public: VeA;zq  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _p?lRU8  
 protected: tB&D~M6[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BEg%u)"([  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `8xmM A_l  
  //}}AFX_VIRTUAL 3xsC"c>  
  // Implementation '-D-H}%;}M  
 protected: :)g=AhBF  
  HICON m_hIcon; ` R!0uRu  
  // Generated message map functions r,2x?Qi  
  //{{AFX_MSG(CCaptureDlg) ;s3"j~5m)  
  virtual BOOL OnInitDialog(); -869$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); REW *6:  
  afx_msg void OnPaint(); {b<p~3%+Hc  
  afx_msg HCURSOR OnQueryDragIcon(); ZUQ1\Iw  
  virtual void OnCancel(); N1\u~%AT"  
  afx_msg void OnAbout(); \x(J v Dt  
  afx_msg void OnBrowse(); d5T0#ue/e  
  afx_msg void OnChange(); )U>q><  
 //}}AFX_MSG +VdYT6{p  
 DECLARE_MESSAGE_MAP() )Y\},O  
}; #h /-  
#endif Rr^<Q:#"<|  
r}WV"/]p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8niQG']  
#include "stdafx.h" }z,4IHNn  
#include "Capture.h" "#rlL^9v  
#include "CaptureDlg.h" 5G_*T  
#include <windowsx.h> <& 8cq@<  
#pragma comment(lib,"hook.lib") 2"'0OQN0\  
#ifdef _DEBUG TA`*]*O(  
#define new DEBUG_NEW GTYGm  
#undef THIS_FILE D(~6h,=m  
static char THIS_FILE[] = __FILE__; *=MC+4E  
#endif 8/-GrdyE  
#define IDM_SHELL WM_USER+1 \kzxt/Ow  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?fnJ`^|-r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k>K23(X  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g/lv>*+gS  
class CAboutDlg : public CDialog ~fAdOh  
{ ^^}  
 public: 67}y/C]<  
  CAboutDlg(); d{9rEB?  
  // Dialog Data F{[2|u(4  
  //{{AFX_DATA(CAboutDlg) [bJ"*^M)  
  enum { IDD = IDD_ABOUTBOX }; 4eU};Pv  
  //}}AFX_DATA '@AK0No\W  
  // ClassWizard generated virtual function overrides  3iV/7~ O  
  //{{AFX_VIRTUAL(CAboutDlg) ah"2^x  
 protected: YXg:cXE8e  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _:c8YJEG{  
  //}}AFX_VIRTUAL < hZA$.W3  
  // Implementation hNyYk(t^  
 protected: d7It}7@9  
  //{{AFX_MSG(CAboutDlg) HzQ6KYAMq  
  //}}AFX_MSG @-qxNw  
  DECLARE_MESSAGE_MAP() )!|K3%9  
}; w/d9S(  
e|):%6#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2~2  
{ @gE +T37x2  
 //{{AFX_DATA_INIT(CAboutDlg) ok-sm~bp  
 //}}AFX_DATA_INIT R|$=Pfg~4  
} }&y>g0$@  
m3F.-KPO  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8$v17 3  
{ F!|Z_6\tv:  
 CDialog::DoDataExchange(pDX); HpDU:m  
 //{{AFX_DATA_MAP(CAboutDlg) @2CYv>  
 //}}AFX_DATA_MAP l"IBt:  
} %Q1v8l.}  
R@=ve %a-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7xwS  .|  
 //{{AFX_MSG_MAP(CAboutDlg) BG-uKJ ^  
 // No message handlers <H}"xp)j0  
 //}}AFX_MSG_MAP nl*{@R.q @  
END_MESSAGE_MAP() #n{wK+lz  
_AI2\e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7Q 0 M3m  
: CDialog(CCaptureDlg::IDD, pParent) H<}<f:  
{ /B|#GJ\\3  
 //{{AFX_DATA_INIT(CCaptureDlg) #c+N}eX{  
  m_bControl = FALSE; /-^gK^  
  m_bAlt = FALSE; W E|L{  
  m_bShift = FALSE; fS1N(RZ 1  
  m_Path = _T("c:\\"); y"cK@sOo  
  m_Number = _T("0 picture captured."); S N?jxQ  
  nCount=0; g}ciG!0  
  bRegistered=FALSE; xfkG&&  
  bTray=FALSE; '[qG ,^f  
 //}}AFX_DATA_INIT 'bY^=9&|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;l4rg!r(S  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]8+%57:E  
} Arir=q^2  
0Hff/~J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H",yVD  
{ 73Mh65  
 CDialog::DoDataExchange(pDX); r$k *:A$%  
 //{{AFX_DATA_MAP(CCaptureDlg) 6\4oHRJC  
  DDX_Control(pDX, IDC_KEY, m_Key); >^|\wy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /y@$|DI1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); B(Y{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~M(K{6R  
  DDX_Text(pDX, IDC_PATH, m_Path); [xO^\oQa=c  
  DDX_Text(pDX, IDC_NUMBER, m_Number); x"8(j8e  
 //}}AFX_DATA_MAP mC>7l7%  
} Q`5jEtu#,  
UQ'D-eK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %CF(SK2w  
//{{AFX_MSG_MAP(CCaptureDlg) -T4?5T_  
 ON_WM_SYSCOMMAND() C.8]~MP  
 ON_WM_PAINT() ?.\ CUVK  
 ON_WM_QUERYDRAGICON() 3c@Cb`w@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) kL*Q})  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S;+bQ.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *N\U{)b\  
//}}AFX_MSG_MAP zclt2?  
END_MESSAGE_MAP() jGR_EE  
wXuHD<<  
BOOL CCaptureDlg::OnInitDialog() (W=z0Lqu  
{ OjJlGElw  
 CDialog::OnInitDialog(); +wD--24!(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ZS>}NN  
 ASSERT(IDM_ABOUTBOX < 0xF000); &p8K0 |  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W qci51y>#  
 if (pSysMenu != NULL) )P:TVe9`  
 { R/ l1$}  
  CString strAboutMenu; ouVR[w>V  
  strAboutMenu.LoadString(IDS_ABOUTBOX); kn+`2-0  
  if (!strAboutMenu.IsEmpty()) +c}fDrr)  
  { T>vHZZiO  
   pSysMenu->AppendMenu(MF_SEPARATOR); Nf-IDK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9y.C])(2  
  } tz1iabZ{  
 } .Ks&r  
 SetIcon(m_hIcon, TRUE); // Set big icon \w^U<_zq  
 SetIcon(m_hIcon, FALSE); // Set small icon qa`bR%eH  
 m_Key.SetCurSel(0); NZ7a^xT_)  
 RegisterHotkey(); /}#z/m@bN  
 CMenu* pMenu=GetSystemMenu(FALSE); ofcoNLX5c  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #`y7L4V*o  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6dC!&leNi  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qIA!m .GC  
 return TRUE; // return TRUE unless you set the focus to a control f IQ$a >  
} :E4i@ O7%  
sw{EV0&>m  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D~NH 4B  
{ dfc-#I p?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FEU$D\1y  
 { ,dzbI{@6  
  CAboutDlg dlgAbout; 78dmXOZ'_h  
  dlgAbout.DoModal(); (zk'i13#6  
 } Sh2q#7hf  
 else >,uof?  
 { Xw9,O8}C7  
  CDialog::OnSysCommand(nID, lParam); e)!X9><J  
 } A ;Z%-x  
} q Z`@Ro  
kj@#oLd%  
void CCaptureDlg::OnPaint() Qs#v/r  
{ ^a<=@0|  
 if (IsIconic()) CM9+h;Zm  
 { &>L\unS  
  CPaintDC dc(this); // device context for painting ,o*b-Cv/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $'?CY)h{  
  // Center icon in client rectangle YCw^u  
  int cxIcon = GetSystemMetrics(SM_CXICON); Be8Gx  
  int cyIcon = GetSystemMetrics(SM_CYICON); @8n0GCv  
  CRect rect; Tk.MtIs)V}  
  GetClientRect(&rect); !G`w@E9M)  
  int x = (rect.Width() - cxIcon + 1) / 2; 2ZIf@C{P.  
  int y = (rect.Height() - cyIcon + 1) / 2; .Zf#L'Rf  
  // Draw the icon 8N ci1o  
  dc.DrawIcon(x, y, m_hIcon); ` mALx! `  
 } qLA  
 else Fypqf|  
 { MI',E?#yB  
  CDialog::OnPaint(); 4\Y=*X  
 } [RC|W%<Z>  
} ~z32%k  
>=C)\Yfu)  
HCURSOR CCaptureDlg::OnQueryDragIcon() XRP/E_4  
{ 7D9R^\K  
 return (HCURSOR) m_hIcon; r-4I{GPb  
} 0 I;>du  
"9kEqz4a  
void CCaptureDlg::OnCancel() |06J4H~k  
{ zrnc~I+  
 if(bTray) asPD>jc  
  DeleteIcon(); 4J94iI>S.l  
  CDialog::OnCancel(); jD H)S{k  
} I`Rxijz  
RM%l hDFY  
void CCaptureDlg::OnAbout() PeT A:MW  
{ 6Oo'&3@  
 CAboutDlg dlg; rUx%2O|qu  
 dlg.DoModal(); 6JK;]Ah  
} tC|5;'m.2  
jWP(7}U  
void CCaptureDlg::OnBrowse() %[NefA(  
{ ~a/yLI"'g  
 CString str; aASnk2DFd  
 BROWSEINFO bi; Y`lC4*g  
 char name[MAX_PATH]; b!7"drge:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $JX_e  
 bi.hwndOwner=GetSafeHwnd(); #i)h0ML/e  
 bi.pszDisplayName=name; >OiC].1   
 bi.lpszTitle="Select folder"; Eq'{uV:  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \ZCc~muR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v6oZD;;~  
 if(idl==NULL) j}0*`[c  
  return; [gQ~B1O  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \%^<Ll  
 str.ReleaseBuffer(); fFSW\4JD=  
 m_Path=str; !H?#~{ W}  
 if(str.GetAt(str.GetLength()-1)!='\\') (">!vz  
  m_Path+="\\"; DPy"FQYZb  
 UpdateData(FALSE); 9dKrE_zK:  
} atl0#FBd  
!u4oo-  
void CCaptureDlg::SaveBmp() "8{u_+_B*  
{ ^IQC:2 1  
 CDC dc; dzbzZ@y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); D5AKOM!`  
 CBitmap bm; Y*J`Wf(w  
 int Width=GetSystemMetrics(SM_CXSCREEN); ly, d =  
 int Height=GetSystemMetrics(SM_CYSCREEN); !t;$n!7<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (qB$I\  
 CDC tdc; $lV0TCgba8  
 tdc.CreateCompatibleDC(&dc); N15{7 ,   
 CBitmap*pOld=tdc.SelectObject(&bm); \Sm.]=b r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QD"V=}'?  
 tdc.SelectObject(pOld); n:k~\-&WJ  
 BITMAP btm; ,`-6!|:  
 bm.GetBitmap(&btm); '%K,A-7W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; eJ7A.O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u!{P{C  
 BITMAPINFOHEADER bih; )5yZSdA  
 bih.biBitCount=btm.bmBitsPixel; {u9VHAXCf  
 bih.biClrImportant=0; }Qg9l|  
 bih.biClrUsed=0; 9"MC<  
 bih.biCompression=0; }.` ycLW'  
 bih.biHeight=btm.bmHeight; p|AIz3  
 bih.biPlanes=1; j##IJm  
 bih.biSize=sizeof(BITMAPINFOHEADER); %)q5hB  
 bih.biSizeImage=size; LvW9kL+WiQ  
 bih.biWidth=btm.bmWidth; `n5|4yaG~  
 bih.biXPelsPerMeter=0; (A(d]l  
 bih.biYPelsPerMeter=0; i ]F,Y;&|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $!KV]]  
 static int filecount=0; Cww$ A %}  
 CString name; fE_QB=9 cz  
 name.Format("pict%04d.bmp",filecount++); \[Rh\v&  
 name=m_Path+name; 5 QMu=/  
 BITMAPFILEHEADER bfh; q] ,&$d^@  
 bfh.bfReserved1=bfh.bfReserved2=0; 4-cnkv\~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4[+n;OI  
 bfh.bfSize=54+size; y4M<L. RO  
 bfh.bfOffBits=54; CS6,mX  
 CFile bf; r 97 VX>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M^+~r,D1u  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *qKwu?]?>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M}M.  
  bf.WriteHuge(lpData,size); 6,s@>8n  
  bf.Close(); FV:{lC{h~  
  nCount++; 52-^HV  
 } _=4Dh/Dv  
 GlobalFreePtr(lpData); R.> /%o  
 if(nCount==1) E: XzX Fxx  
  m_Number.Format("%d picture captured.",nCount); oOQnV(I  
 else  h}+,]^  
  m_Number.Format("%d pictures captured.",nCount); (lEWnf=2h  
  UpdateData(FALSE); ~Bj-n6QDE  
} eMWY[f3  
f9OVylm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m}F1sRkdQ  
{ Ep?a1&b  
 if(pMsg -> message == WM_KEYDOWN) S/7D}hJ  
 { L>pP3[~DV  
  if(pMsg -> wParam == VK_ESCAPE) G ytI_an8  
   return TRUE; 1VJE+3  
  if(pMsg -> wParam == VK_RETURN) ab3" ?.3m  
   return TRUE; .hT^7|Jz[  
 } I uhyBo  
 return CDialog::PreTranslateMessage(pMsg); T[ky7\  
} y . AN0  
uOm fpgO  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ilzR/DJMa  
{ rQ~%SUM7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I#$u(2.H  
  SaveBmp(); B>9D@fmzs  
  return FALSE; _0Wd m*  
} H(n_g QAX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :Wb+&|dU  
 CMenu pop; KOw Ew~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @8V8gV? zm  
 CMenu*pMenu=pop.GetSubMenu(0); + Uj~zx@  
 pMenu->SetDefaultItem(ID_EXITICON);  !X |Tf  
 CPoint pt; I /> .P  
 GetCursorPos(&pt); ){8^l0b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kk^KaD4dA  
 if(id==ID_EXITICON) ]9b*!n<z  
  DeleteIcon();  q#MA A_  
 else if(id==ID_EXIT) p?6w/n  
  OnCancel(); P#76ehR]K  
 return FALSE; Lo9+#ITyx  
} ydoCoD w  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3#5sj >  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `?`\!uP"  
 AddIcon(); >f}rM20Vm  
 return res; +O\6p  
} !U=;e?o  
|bB..b  
void CCaptureDlg::AddIcon() lD 9'^J  
{ <qv:7@  
 NOTIFYICONDATA data;  UIhB  
 data.cbSize=sizeof(NOTIFYICONDATA); >/evL /  
 CString tip; LH0\SmhU  
 tip.LoadString(IDS_ICONTIP); ^Z2%b>  
 data.hIcon=GetIcon(0); H:p(C?tk{  
 data.hWnd=GetSafeHwnd(); 2nOQ48ha T  
 strcpy(data.szTip,tip); [+ 1([#  
 data.uCallbackMessage=IDM_SHELL; uXtfP?3Vy  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [(UQQa=+  
 data.uID=98; l3(k  
 Shell_NotifyIcon(NIM_ADD,&data); zBqr15  
 ShowWindow(SW_HIDE); #YjV3O5<  
 bTray=TRUE; ,!u^E|24  
} Z#^2F8,]  
^c.b@BE  
void CCaptureDlg::DeleteIcon() e|]g ?!  
{ >TK`s@jdSV  
 NOTIFYICONDATA data; 42Ql^ka  
 data.cbSize=sizeof(NOTIFYICONDATA); 574 b]  
 data.hWnd=GetSafeHwnd(); ,]20I _  
 data.uID=98; z?FZu,h}  
 Shell_NotifyIcon(NIM_DELETE,&data); WET $H,  
 ShowWindow(SW_SHOW); r\_aux^z  
 SetForegroundWindow(); @{XN}tWDOp  
 ShowWindow(SW_SHOWNORMAL); 'Y>!xm   
 bTray=FALSE; GTJ\APrH  
} %xWmzdn  
vWzNsWPK"{  
void CCaptureDlg::OnChange() ~5]AXi'e~  
{ P),%S9jP;  
 RegisterHotkey(); T73saeN  
} x"U/M ?l  
4zfgtg(  
BOOL CCaptureDlg::RegisterHotkey() E39:}_IV  
{ )mwY] !  
 UpdateData(); vad" N  
 UCHAR mask=0; !YAkHrF`[0  
 UCHAR key=0; +Y 3_)  
 if(m_bControl) h'T\gF E%  
  mask|=4; iHQFieZ.E  
 if(m_bAlt) 2ZLK`^S  
  mask|=2; h-!(O^M  
 if(m_bShift) [o|]>(tk  
  mask|=1; 5p"*n kF  
  key=Key_Table[m_Key.GetCurSel()]; 2NE/ZqREg  
 if(bRegistered){ #v~zf@<KLB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "B)DX*-\?  
  bRegistered=FALSE; XwlUkw "q  
 } ^JY R^X>_  
 cMask=mask; F fl`;M  
 cKey=key; |(y6O5Y.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TX;OA"3=\-  
 return bRegistered; o&I 0*~ sN  
} 9HP)@66  
vR+(7^Yy  
  四、小结 ilFM+x@  
APK@Oq  
  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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