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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: ;Zj(**#H  
  S-ZN}N{,6  
  一、实现方法 w)RedJnf  
_Y/*e<bU  
  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: HZ}Igw.Z  
=J]EVD   
#pragma data_seg("shareddata") A+frKoi  
HHOOK hHook =NULL; //钩子句柄 ZZHzC+O#^  
UINT nHookCount =0; //挂接的程序数目 @V:Y%#%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z}.6yHS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Rm79mh9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -Ah&|!/  
static int KeyCount =0; 2eeFaFif  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 O^ui+44wp  
#pragma data_seg() Xdl dUK[  
t+q;}ZvG  
  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。 ;hV|W{=w  
MEJX5qG6m  
  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: Lccy~2v>  
Y'bz>@1(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR MP<]-M'|<  
cKey,UCHAR cMask) W[qy4\.B  
{ sLJ]N0t  
 BOOL bAdded=FALSE; /V`SJ"  
 for(int index=0;index<MAX_KEY;index++){ `-{? !  
  if(hCallWnd[index]==0){ :dRC$?f4  
   hCallWnd[index]=hWnd; E i>GhvRM  
   HotKey[index]=cKey; WiB~sIp  
   HotKeyMask[index]=cMask; %n8CK->  
   bAdded=TRUE; 6OAEAIh  
   KeyCount++; )ZBNw{nh  
   break; g6P^JW}.  
  } ? daxb  
 } TF5jTpGq  
 return bAdded; -K(d]-yv  
} Yb_HvP  
//删除热键 D)DD6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  ;Ss!OFK  
{ /\uopa  
 BOOL bRemoved=FALSE; {X{S[(|  
 for(int index=0;index<MAX_KEY;index++){ m&D I2he  
  if(hCallWnd[index]==hWnd){ CDXN%~0h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vM!2?8bEFd  
    hCallWnd[index]=NULL; .-mIU.Nwi  
    HotKey[index]=0; DO~[VK%|  
    HotKeyMask[index]=0; )?{!7/H F@  
    bRemoved=TRUE; b]Kb ~y|  
    KeyCount--; 9L3P'!Z  
    break; ~o|sma5.  
   } o@_i&4[MW  
  } =EM<LjO  
 } 5@ td0  
 return bRemoved; :t9![y[=|  
} 5}Ge  
^ <`SUBI  
8!3q:8y8  
  DLL中的钩子函数如下: OHj>ufwVq  
rl~Rbi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +r//8&  
{ rtQ{  
 BOOL bProcessed=FALSE; b?Uk%Z]+v  
 if(HC_ACTION==nCode) rw3tU0j  
 { $gz8! f?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 F?]J`F\I  
   switch(wParam) Ta/zDc"e  
   {  2|i1}  
    case VK_MENU: z;2& d<h  
     MaskBits&=~ALTBIT; ?V+\E2  
     break; 5S!j$_(  
    case VK_CONTROL: :p@jslD  
     MaskBits&=~CTRLBIT; `Npo|.?=  
     break; 1@ &J"*  
    case VK_SHIFT: dmv0hof  
     MaskBits&=~SHIFTBIT; =54D#,[B  
     break; hCF_pt+  
    default: //judge the key and send message F%&lM[N%  
     break; s-'~t#h  
   } EA1&D^nT  
   for(int index=0;index<MAX_KEY;index++){ }~PG]A  
    if(hCallWnd[index]==NULL) `v)'(R7){  
     continue; &8Vh3QLEx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &\~*%:C  
    { D]aQt%TL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HWB\}jcA6u  
     bProcessed=TRUE; !jU{ }RCR  
    } "(p/3qFY  
   } @&&} J  
  } iHf):J?8 y  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^>!&]@  
   switch(wParam) *S}CiwW>/  
   { K0C"s 'q  
    case VK_MENU: k}E_1_S(  
     MaskBits|=ALTBIT; \o2l;1~  
     break; I+.U.e^gx  
    case VK_CONTROL: LEtGrA/%@b  
     MaskBits|=CTRLBIT; 4gev^/^^  
     break; ^[}W}j>  
    case VK_SHIFT: .o]I^3tf c  
     MaskBits|=SHIFTBIT; "M/) LXn:0  
     break; Q(aNa!  
    default: //judge the key and send message sq(5k+y*J  
     break; r r\u)D#)  
   } tN4&#YK<  
   for(int index=0;index<MAX_KEY;index++){ Sw; kUJ  
    if(hCallWnd[index]==NULL) K;rgLj0m  
     continue; yS4VgP'W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qrj f  
    { e1JH N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }Rh%bf7,  
     bProcessed=TRUE; 'U ZzH$h  
    } "s]  
   } XRQ1Uh6  
  } O gQ8yKfDB  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i%<NKE;v7m  
   for(int index=0;index<MAX_KEY;index++){ 0QPY+6  
    if(hCallWnd[index]==NULL) A Y<L8  
     continue; *,:2O&P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RFFbS{U*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g@s`PBF7`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,YBO}l  
   } X )Tyxppf'  
  } +e*C`uP!  
 } J?dz>3Rhx9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RyukQY~<W  
} _w %:PnO  
??P\v0E  
  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: L aA<`  
Hhk`yX c_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .{?; #Cdn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yX{7<\x   
<P0 P*>M  
  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: eg?p)|  
fr04nl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;vPFRiFK  
{ U=j`RQ 9,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) <vV"abk  
 { a=y%+E'a '  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 X@Zt4)2#  
  SaveBmp(); :8}Qt^p  
  return FALSE; Tmu2G/yi  
 } G,P k3>I'  
 …… //其它处理及默认处理 R=, pv'  
} xW9R -J \W  
+/[Rvh5WZ  
5W|wDy  
  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。 FYE(lEjxi  
\r{wNqyv  
  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。 ThW9=kzQW  
mAW(j@5sp  
  二、编程步骤 aQY.96yo  
_dAn/rj   
  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"; G.@K#a9  
cp~6\F;c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; TxN+-< f  
zPHx\z"  
  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; i,Z-UA|f=T  
.=G3wox3  
  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; s[UV(::E  
5%V(eR  
  5、 添加代码,编译运行程序。 qM 1ZCt  
aL;zN%Tw  
三、程序代码 jpR]V86G  
,aP5)ZN-  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL A0;{$/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fU%Ys9:wU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ };"_Ku4#-  
#if _MSC_VER > 1000 . 8ikcs  
#pragma once ^!k_"C)B  
#endif // _MSC_VER > 1000 %RF$Y=c'C  
#ifndef __AFXWIN_H__ wouk~>Jft  
#error include 'stdafx.h' before including this file for PCH 1B&XM^>/  
#endif sRcS-Yw[S  
#include "resource.h" // main symbols Mg8ciV}\xY  
class CHookApp : public CWinApp ~p{YuW[e  
{ ]{{%d4  
 public: Rc D5X{qS#  
  CHookApp(); fwzyCbks  
  // Overrides Yh"9,Z&wiR  
  // ClassWizard generated virtual function overrides 7TypzgXNe  
  //{{AFX_VIRTUAL(CHookApp) ds+2z=!!e  
 public: |d6/gSiF  
  virtual BOOL InitInstance(); *M:p[.=1  
  virtual int ExitInstance(); 67}8EV!/k  
  //}}AFX_VIRTUAL qQo*:3/];  
  //{{AFX_MSG(CHookApp) (k"0/*F4_  
  // NOTE - the ClassWizard will add and remove member functions here. 'zMmJl}\vd  
  // DO NOT EDIT what you see in these blocks of generated code ! ~=HPqe8  
  //}}AFX_MSG F8tMZ,:  
  DECLARE_MESSAGE_MAP() 4z~;4   
}; l$l6,OzS@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /J!hKK^k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +@8, uL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `2V{]F  
BOOL InitHotkey(); :(3'"^_NA  
BOOL UnInit(); g?}h*~<b  
#endif Vz!{nL0Q(  
!rqs!-cCQ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ff fWvf  
#include "stdafx.h" CJ)u#PmkJ  
#include "hook.h" hmb=_W  
#include <windowsx.h> *(i%\  
#ifdef _DEBUG 0CX9tr2J  
#define new DEBUG_NEW 9nlj{(  
#undef THIS_FILE PT&qys 2k  
static char THIS_FILE[] = __FILE__; Z.aeE*Hs$  
#endif $mf6!p4  
#define MAX_KEY 100 PIQd=%?'  
#define CTRLBIT 0x04 TDg<&ND3  
#define ALTBIT 0x02 *8%uXkMm  
#define SHIFTBIT 0x01 Ln\Gv/)  
#pragma data_seg("shareddata") OMYbCy^  
HHOOK hHook =NULL; { M[iYFg=  
UINT nHookCount =0; gMZrtK`<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey pMUUF5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT W7~OU(}[`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey B&*`A&^y  
static int KeyCount =0; -&v0JvTJ9j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P{2ED1T\  
#pragma data_seg() XwU1CejP0  
HINSTANCE hins; nvodP"iV  
void VerifyWindow(); w>RwEU+w=@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >7W8_6sC<  
//{{AFX_MSG_MAP(CHookApp) Gh%dVP9B@P  
// NOTE - the ClassWizard will add and remove mapping macros here. 8<E U|/O  
// DO NOT EDIT what you see in these blocks of generated code! f=4q]y#& X  
//}}AFX_MSG_MAP d,j)JnY3V  
END_MESSAGE_MAP() gG(9&}@(  
# .OCoc  
CHookApp::CHookApp() kCoEdQ_  
{ ah!RQ2hDrV  
 // TODO: add construction code here, 8D^ iQBA  
 // Place all significant initialization in InitInstance |hu9)0 P  
} F22]4DLHO  
+~lPf.  
CHookApp theApp; "#%9dWy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) L N'})CI8m  
{ L9z5o(Aa  
 BOOL bProcessed=FALSE; pM!cF  
 if(HC_ACTION==nCode) Y#U0g|UDn  
 { W[73q>'  
  if((lParam&0xc0000000)==0xc0000000){// Key up #'y^@90R  
   switch(wParam) N\hHu6  
   { \ERHnh  
    case VK_MENU: ]XfROhgP=  
     MaskBits&=~ALTBIT; R}OjSiS\  
     break; w~e$ul(IQM  
    case VK_CONTROL: 6ZGw 3p)  
     MaskBits&=~CTRLBIT; IU]@%jA_:A  
     break; eGbjk~,f'  
    case VK_SHIFT: DwXSlsN3v  
     MaskBits&=~SHIFTBIT; (xBWxeL~  
     break; DpL|aRdbK  
    default: //judge the key and send message "j}fcrlG9  
     break; @iYr<>iDZ  
   } a 0qDRB  
   for(int index=0;index<MAX_KEY;index++){ *{e,< DV  
    if(hCallWnd[index]==NULL) re@OPiXa v  
     continue; P"+K'B7K3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qu|<1CrZj]  
    { CX>QP&Gj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `u;4Z2Lr0  
     bProcessed=TRUE; dJmr!bN\;  
    } gBXbB9  
   } Gii1|pLZ1  
  } r5!Sps3B  
  else if((lParam&0xc000ffff)==1){ //Key down w"E.Va  
   switch(wParam) ?)/&tk9.n  
   { 82=>I*0Q  
    case VK_MENU: mH4Jl1S&  
     MaskBits|=ALTBIT; 59a7%w  
     break; Jn1(-  
    case VK_CONTROL: 0tN/P+!|  
     MaskBits|=CTRLBIT; p=f8A71  
     break; _^] :tL6  
    case VK_SHIFT: &8Oy*'  
     MaskBits|=SHIFTBIT; XZpF<7l  
     break; |%Ssb;M  
    default: //judge the key and send message Ky[-ZQQo=5  
     break; 8lT2qqlr  
   } *W1:AGpz  
   for(int index=0;index<MAX_KEY;index++) X&|y|  
   { /A%31WE&1  
    if(hCallWnd[index]==NULL) C;eM:v0A[  
     continue; roWg~U(S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2?9gf,U  
    { Y:K1v:Knw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?_G?SQ  
     bProcessed=TRUE; qMmhmH)Gp  
    } 1n+JHXR\  
   } tc)4$"9)  
  } VrZ6m  
  if(!bProcessed){ ?\T):o;/  
   for(int index=0;index<MAX_KEY;index++){ ?h|w7/9  
    if(hCallWnd[index]==NULL) XZ1<sm8t."  
     continue; UP e@>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |gJI}"T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <a$'tw-8  
   } 9]*hP](  
  } 7V7iIbi  
 } (n~GKcA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); t3FfPV!P"  
} aEC&#Q(]q  
L[p[m~HjG^  
BOOL InitHotkey() >=3ay^(Y2D  
{ ^/v!hq_#%&  
 if(hHook!=NULL){ x[eho,6)  
  nHookCount++; 3h>5 6{P  
  return TRUE; :~dI2e\:  
 } Bis'59?U_  
 else pe7R1{2Q_s  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4l"oq"uc  
  if(hHook!=NULL) RS1c+]rr  
   nHookCount++; s*.&DN  
  return (hHook!=NULL); }SF<. A  
} c/ABBvd|  
BOOL UnInit() !$^LTBOH3  
{ m}>#s3KPA  
 if(nHookCount>1){ zD}2Zh]  
  nHookCount--; i slg5  
  return TRUE; [(4s\c  
 } 58.b@@T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); , aQ{  
 if(unhooked==TRUE){ ~OQ/ |ws  
  nHookCount=0; (cEjC`]  
  hHook=NULL; QGQ}I  
 } uf&Ke k,  
 return unhooked; K trR+ :  
} fp2.2 @[  
I2<t?c:Pn<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0!!z'm3  
{ >`!Lh`n7_  
 BOOL bAdded=FALSE; (}NKW  
 for(int index=0;index<MAX_KEY;index++){ r1QLSD]i6  
  if(hCallWnd[index]==0){ 8 ,<F102(  
   hCallWnd[index]=hWnd; ;Jq 7E  
   HotKey[index]=cKey; c2fbqM~  
   HotKeyMask[index]=cMask; %Ut7%obpi  
   bAdded=TRUE; Y)]x1I  
   KeyCount++; 6 P6Pl&  
   break; *#2]`G)  
  } ;/]v mgl2  
 } 9H4NvB{  
 return bAdded; 7Eett)4  
} Vy giR|f-  
kw Iw=8q~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?3{:[*  
{ A ^wIsAxT  
 BOOL bRemoved=FALSE; c$[cDf~  
 for(int index=0;index<MAX_KEY;index++){ & e~g}7  
  if(hCallWnd[index]==hWnd){ mU3 @|a/@0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,8MUTXd@ V  
    hCallWnd[index]=NULL; c O[Hr  
    HotKey[index]=0; .gK>O2hI  
    HotKeyMask[index]=0; S;]][h =  
    bRemoved=TRUE; /kKF|Hg`c  
    KeyCount--; yG<`7v  
    break; n_X)6 s  
   } ?$&iVN^UA  
  } iO_6>&(  
 } kX)Xo`^Ys  
 return bRemoved; 2PrUI;J$  
} l;C00ZBOc  
&6mXsx$  
void VerifyWindow() 5bKm)|4z6  
{ bF X0UE>  
 for(int i=0;i<MAX_KEY;i++){ {"x8 q  
  if(hCallWnd!=NULL){ K~B@8az  
   if(!IsWindow(hCallWnd)){ I"<ACM  
    hCallWnd=NULL; Z} Ld!Byz  
    HotKey=0; 9e*v&A2Y'  
    HotKeyMask=0; p%+uv\Ix  
    KeyCount--; `swf~  
   } :n} NQzs  
  } SZ[ ,(h  
 } sF`ELrR \  
} &n)=OConge  
^YLk&A)X  
BOOL CHookApp::InitInstance() g~i%*u,Y<  
{ +jPs0?}s  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [9S?  
 hins=AfxGetInstanceHandle(); R;68C6 4  
 InitHotkey(); U:n3V  
 return CWinApp::InitInstance(); w`")^KXi  
} e MT5bn  
@ !UuK;  
int CHookApp::ExitInstance() >w~Hq9  
{ nA#FGfZ{Ge  
 VerifyWindow(); *$eMM*4  
 UnInit(); sD[G?X  
 return CWinApp::ExitInstance(); Fuuy_+p@G  
} Ur/+nL{  
 @{|vW  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lSu\VCG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =83FCq"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gISG<!+X^  
#if _MSC_VER > 1000 "DniDA  
#pragma once M@=eWZ<  
#endif // _MSC_VER > 1000 zFn-V EJ)  
CPto?=*A  
class CCaptureDlg : public CDialog >*A"tk#oR  
{ AD ,  
 // Construction FXi"o $N  
 public: B7 ^*xskH  
  BOOL bTray; e{"r3*  
  BOOL bRegistered; mjwh40x.o  
  BOOL RegisterHotkey(); O"D0+BK79e  
  UCHAR cKey; <^APq8>  
  UCHAR cMask; hZ ve8J  
  void DeleteIcon(); dP0%<Q|  
  void AddIcon(); X{j`H\'L  
  UINT nCount; t%`GXJb  
  void SaveBmp(); t[ Zoe+&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {|;5P.,l  
  // Dialog Data ,W!v0*uxp&  
  //{{AFX_DATA(CCaptureDlg) <ETR6r  
  enum { IDD = IDD_CAPTURE_DIALOG }; d0Jaa1b~O  
  CComboBox m_Key; SGuLL+|W#8  
  BOOL m_bControl; *C (/ 2  
  BOOL m_bAlt; cM= ? {W7~  
  BOOL m_bShift; |NsrO8H   
  CString m_Path; aOj(=s  
  CString m_Number; 9F&s9(=\  
  //}}AFX_DATA p%8v+9+h2  
  // ClassWizard generated virtual function overrides h*2NFL~#  
  //{{AFX_VIRTUAL(CCaptureDlg) -f+U:/'.>v  
 public: ,'KQFC   
  virtual BOOL PreTranslateMessage(MSG* pMsg); <u 'q._m  
 protected: _h=kjc}[.O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M+mO4q6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); am$-1+iX  
  //}}AFX_VIRTUAL ^"g # !  
  // Implementation ]W-7 U_  
 protected: :j}]nS  
  HICON m_hIcon; )9.i'{{ 0  
  // Generated message map functions /Lf+*u>"  
  //{{AFX_MSG(CCaptureDlg) Z uh!{_x;  
  virtual BOOL OnInitDialog(); / p_mFA]@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u0)~Im,X  
  afx_msg void OnPaint(); zO)>(E?  
  afx_msg HCURSOR OnQueryDragIcon(); [HV>4,,3"  
  virtual void OnCancel(); 2Op\`Ht &  
  afx_msg void OnAbout(); wcdD i[E>i  
  afx_msg void OnBrowse(); w;RG*rv  
  afx_msg void OnChange(); ?W#>9WQi  
 //}}AFX_MSG RW#&f*  
 DECLARE_MESSAGE_MAP() Zr&~gXmVS  
}; jP]I>Tq  
#endif 3kl<~O|Fs  
f^tCD'Vmi  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rM sd)  
#include "stdafx.h" [%8t~zg  
#include "Capture.h" V8aLPJ0_  
#include "CaptureDlg.h" ((2 g  
#include <windowsx.h> NaR/IsN8%  
#pragma comment(lib,"hook.lib") 2W}f|\8MX  
#ifdef _DEBUG 3M;[.b  
#define new DEBUG_NEW FXHcy:)}G  
#undef THIS_FILE {Q&@vbw'  
static char THIS_FILE[] = __FILE__; zjzW;bo( d  
#endif Eagl7'x  
#define IDM_SHELL WM_USER+1 >O{[w'sWa  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7lo`)3mB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k3-'!dW<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;oKN8vI#7  
class CAboutDlg : public CDialog :f~[tox  
{ IsaL+elq|  
 public: 9rB,7%@EL  
  CAboutDlg(); AjTkQ)  
  // Dialog Data 44uM:;  
  //{{AFX_DATA(CAboutDlg) #hA]r.  
  enum { IDD = IDD_ABOUTBOX }; S690Y]:h$v  
  //}}AFX_DATA h\jV@g$  
  // ClassWizard generated virtual function overrides wTpjM@F?J|  
  //{{AFX_VIRTUAL(CAboutDlg) * 5H  
 protected: /``4!jU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [>B`"nyNQ  
  //}}AFX_VIRTUAL DE{tpN  
  // Implementation Kc6p||<  
 protected: )9^0Qk' ]  
  //{{AFX_MSG(CAboutDlg) BD)5br].  
  //}}AFX_MSG rQ^X3J*`  
  DECLARE_MESSAGE_MAP() y?ps+ce93  
}; V/=NIeSE  
{Z529Ns  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :GXD-6}^|  
{ A]z~Dw3  
 //{{AFX_DATA_INIT(CAboutDlg) M@G <I]\  
 //}}AFX_DATA_INIT PRs[! EB6  
} X&B2&e;  
$_j\b4]%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k/"^W.B aj  
{ kIm)Um  
 CDialog::DoDataExchange(pDX); .pP{;:Avpn  
 //{{AFX_DATA_MAP(CAboutDlg) o3_dHbdI  
 //}}AFX_DATA_MAP O4Wn+$AN  
} sHk,#EsKH  
'nK(cKDIG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) WBo|0(#  
 //{{AFX_MSG_MAP(CAboutDlg) .>5KwEK~  
 // No message handlers 7*!h:rg  
 //}}AFX_MSG_MAP /[[_}\xI%  
END_MESSAGE_MAP() rmX'Ym9#  
]BY^.!Y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H nKO  
: CDialog(CCaptureDlg::IDD, pParent) `^rN"\  
{ =~)J:x\F  
 //{{AFX_DATA_INIT(CCaptureDlg) X+'z@xpj  
  m_bControl = FALSE; NTnjVU }  
  m_bAlt = FALSE; Km5#$IiP;  
  m_bShift = FALSE; Js`xTH'  
  m_Path = _T("c:\\"); *5SOXrvhu6  
  m_Number = _T("0 picture captured."); "T*Sg  
  nCount=0; 20 j9~+  
  bRegistered=FALSE; ^ -s'Ad3  
  bTray=FALSE; i.eu$~F  
 //}}AFX_DATA_INIT U_/sY9gz(  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7^{M:kYC!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UDJ{ iZ  
} Ueq*R(9>  
6ty>0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) g]'RwI  
{ oKl^Ttr  
 CDialog::DoDataExchange(pDX); TRQ@=.  
 //{{AFX_DATA_MAP(CCaptureDlg) [ n[!RddY  
  DDX_Control(pDX, IDC_KEY, m_Key); 9?VyF'r=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ]Iku(<*Ya  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wVI 1sR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); s Zan.Kc#  
  DDX_Text(pDX, IDC_PATH, m_Path); ; TaR1e0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); N;<.::x  
 //}}AFX_DATA_MAP d?j_L`?+  
} ~0mO<0~  
)c'5M]V  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ca: jN0  
//{{AFX_MSG_MAP(CCaptureDlg) T gpf0(  
 ON_WM_SYSCOMMAND() j,q8n`@  
 ON_WM_PAINT() V3<baxdE  
 ON_WM_QUERYDRAGICON() y*Egt`W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #6XN_<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) B{\cV-X$0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0JQ0lzk1  
//}}AFX_MSG_MAP &WSxg&YG)\  
END_MESSAGE_MAP() &<!DNXQ  
<,U=w[cH  
BOOL CCaptureDlg::OnInitDialog() 9y BENvq  
{ 6m#V=4e*  
 CDialog::OnInitDialog(); RUJkfi=$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); '8.r   
 ASSERT(IDM_ABOUTBOX < 0xF000); >900I4]I  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Cu5fp.OS7  
 if (pSysMenu != NULL) 5r=xhOe`  
 { vvJ{fi  
  CString strAboutMenu; s "KPTV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^CIO,I  
  if (!strAboutMenu.IsEmpty()) 2$>"4 N  
  { v/n4Lp$W^  
   pSysMenu->AppendMenu(MF_SEPARATOR); \a:#e%]qz9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &RRHmJI:  
  } g7($lt>  
 } sV8}Gv a  
 SetIcon(m_hIcon, TRUE); // Set big icon XcOfQ s  
 SetIcon(m_hIcon, FALSE); // Set small icon AXUSU(hU  
 m_Key.SetCurSel(0); _:hrm%^  
 RegisterHotkey(); W|IMnK-  
 CMenu* pMenu=GetSystemMenu(FALSE); %LeQpbyOR  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ' `0kW_'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Vej [wY-c  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pwg$% lv  
 return TRUE; // return TRUE unless you set the focus to a control X?,ly3,  
} VO _! +  
2V6=F[T  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c/l%:!A  
{ LRF_w)^['  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k)Y}X)\36  
 { OE{{,HFa`G  
  CAboutDlg dlgAbout; q=NI}k  
  dlgAbout.DoModal(); i/ED_<_ Vg  
 } 0GUm~zi1  
 else s@USJ4#  
 { @Q!Jzw#B  
  CDialog::OnSysCommand(nID, lParam); bSOxM /N  
 } gbb2!q6p  
}  %+\ PN  
mAycfa  
void CCaptureDlg::OnPaint() j]-0m4QF  
{ 3j'A.S  
 if (IsIconic()) ,EkzBVgo  
 { W[pOLc-  
  CPaintDC dc(this); // device context for painting I r8,=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]_Cm 5Z7  
  // Center icon in client rectangle Y7W xV>E  
  int cxIcon = GetSystemMetrics(SM_CXICON); b2}>{Li0  
  int cyIcon = GetSystemMetrics(SM_CYICON); W62 $ HI  
  CRect rect; N_dHPa  
  GetClientRect(&rect); uvN Lm]*  
  int x = (rect.Width() - cxIcon + 1) / 2; XRZj+muTZ  
  int y = (rect.Height() - cyIcon + 1) / 2; 1&zvf4  
  // Draw the icon cT2&nZ  
  dc.DrawIcon(x, y, m_hIcon); )gOVnA/M  
 } lSMv9 :N  
 else bve_*7CEM  
 { {WBe(dc_%  
  CDialog::OnPaint(); +iS'$2)@  
 } AYhWeI+  
} |u r/6{Oj1  
L-&N*   
HCURSOR CCaptureDlg::OnQueryDragIcon() )-98pp7~BB  
{ =mVWfFL  
 return (HCURSOR) m_hIcon; 7_OC&hhL  
} ^!Y]l  
MQs!+Z"m>  
void CCaptureDlg::OnCancel() #Tc]L<."  
{ 8fV.NCyE  
 if(bTray) @vsgmz  
  DeleteIcon(); nWfzwXP>_  
  CDialog::OnCancel(); oXC|q-(C  
} bjn: e!}  
#[ei/p  
void CCaptureDlg::OnAbout() /_WA F90R?  
{ $Hw w  
 CAboutDlg dlg; #&V7CYJ  
 dlg.DoModal(); &zuPt5G|  
} j,DF' h  
[ B{F(~O  
void CCaptureDlg::OnBrowse() o,-p[1b  
{ ;rggO0Y  
 CString str; jeKqS  
 BROWSEINFO bi; |j 9d.M  
 char name[MAX_PATH]; <z'Pj7c[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nt 9LBea  
 bi.hwndOwner=GetSafeHwnd(); zd%n)jlwR  
 bi.pszDisplayName=name; :B^YK].  
 bi.lpszTitle="Select folder"; X;e=d+pw  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _f5>r(1Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  Mi>!  
 if(idl==NULL) ZmLA4<  
  return; pZE}<EX  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); QN4{xf:}S  
 str.ReleaseBuffer(); BlLK6"gJT  
 m_Path=str; /9SEW!E  
 if(str.GetAt(str.GetLength()-1)!='\\') Y ~TR`y  
  m_Path+="\\"; `w&A;fR! H  
 UpdateData(FALSE); B$=oU   
} /)%$xi  
P O*;V<^  
void CCaptureDlg::SaveBmp() k.."_ 4  
{ _4#Mdnh}[  
 CDC dc; AvmI<U  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (DLk+N4UHA  
 CBitmap bm; ?-Qq\D^+  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5T*Uq>x0  
 int Height=GetSystemMetrics(SM_CYSCREEN); w3 n6md  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `49: !M$i  
 CDC tdc; }WowgY  
 tdc.CreateCompatibleDC(&dc); c-jE1y<  
 CBitmap*pOld=tdc.SelectObject(&bm); <E2n M,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 00 9[`Z  
 tdc.SelectObject(pOld); 1"\^@qRv#  
 BITMAP btm; !:]/MpQ ?  
 bm.GetBitmap(&btm); {4F=].!  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; QZh#&Qf;  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e2"<3  
 BITMAPINFOHEADER bih; WMw|lV r  
 bih.biBitCount=btm.bmBitsPixel; C vOH*K'  
 bih.biClrImportant=0; >g>L>{  
 bih.biClrUsed=0; T1-.+&<  
 bih.biCompression=0; \ u*R6z  
 bih.biHeight=btm.bmHeight; [ML|, kq!  
 bih.biPlanes=1; ;aj4V<@  
 bih.biSize=sizeof(BITMAPINFOHEADER); +=Y[RCXT  
 bih.biSizeImage=size; 3(oB[9]s  
 bih.biWidth=btm.bmWidth; J16t&Ha`  
 bih.biXPelsPerMeter=0; @<TC+M5!  
 bih.biYPelsPerMeter=0; QmKEl|/{u  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); nk*T x  
 static int filecount=0; g1H$wU3eu  
 CString name; ;f!}vo<;  
 name.Format("pict%04d.bmp",filecount++); (y^svXU}a  
 name=m_Path+name; SG4)kQ  
 BITMAPFILEHEADER bfh; ^XgBkC~  
 bfh.bfReserved1=bfh.bfReserved2=0; gcA,u)z}R  
 bfh.bfType=((WORD)('M'<< 8)|'B'); kgb:<{pJ  
 bfh.bfSize=54+size; Fv} Uq\v[  
 bfh.bfOffBits=54; @$7'{*  
 CFile bf; I3.cy i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Op_(10|  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3/{,}F$  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j5:/Gl8  
  bf.WriteHuge(lpData,size);  NZu2D  
  bf.Close(); Z ~3  
  nCount++; Q{o]^tN  
 } Z[G[.\0  
 GlobalFreePtr(lpData); W^,(we  
 if(nCount==1) 9dO. ,U*`  
  m_Number.Format("%d picture captured.",nCount); 7~qyz]KkE  
 else Yq-Vwh/  
  m_Number.Format("%d pictures captured.",nCount); YlC$L$%Zd.  
  UpdateData(FALSE); :^En\YcU  
} X( )yhe_  
4T>d%Tt+)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) [BTOs4f  
{ " Ng%"Nz  
 if(pMsg -> message == WM_KEYDOWN) oFi_ op  
 { [9C{\t  
  if(pMsg -> wParam == VK_ESCAPE) X|'[\v2ld  
   return TRUE; iu iVr$E  
  if(pMsg -> wParam == VK_RETURN) +C36OcmT~  
   return TRUE; ROr|n]aJj  
 } nIqNhJ+  
 return CDialog::PreTranslateMessage(pMsg); ts/Ha*h  
} [gIvB<Uv  
<{cf'"O7)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nu `R(2/  
{ xUF5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B!x7oD9  
  SaveBmp(); 5h l!zA?  
  return FALSE; #|QA_5  
} {nj`>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <u}[_  
 CMenu pop; E#~J"9k98  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ly-}HW(  
 CMenu*pMenu=pop.GetSubMenu(0); _Wtwh0[r*  
 pMenu->SetDefaultItem(ID_EXITICON); PVi0|  
 CPoint pt; qQwf#&  
 GetCursorPos(&pt); }vEMG-sxX  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); RZ0+Uu/J  
 if(id==ID_EXITICON) YS bS.tq  
  DeleteIcon(); A~ @x8  
 else if(id==ID_EXIT) pG^>y0  
  OnCancel(); v=~+o[  
 return FALSE; 2Ah B)8bG  
} ew&"n2r  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Pyp#'du>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f~?kx41dq  
 AddIcon(); J(5#fo{Q.g  
 return res; T2}X~A  
} =<X4LO)C  
XC!Y {lp  
void CCaptureDlg::AddIcon() }E^k*S  
{ !PfdY&.)  
 NOTIFYICONDATA data; Y;{(?0 s  
 data.cbSize=sizeof(NOTIFYICONDATA); Y?V.O  
 CString tip; X- j@#Qb  
 tip.LoadString(IDS_ICONTIP); ODxCD%L  
 data.hIcon=GetIcon(0); h,ipQ>  
 data.hWnd=GetSafeHwnd(); &&7&/   
 strcpy(data.szTip,tip); 07G'"=  
 data.uCallbackMessage=IDM_SHELL; r<[G~n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; hf:\^w  
 data.uID=98; hz+c]K  
 Shell_NotifyIcon(NIM_ADD,&data); Z=be ki]  
 ShowWindow(SW_HIDE); =J`M}BBx  
 bTray=TRUE; D$Ao-6QE W  
} bR<XQHl  
1Q7]1fRu  
void CCaptureDlg::DeleteIcon() 0*,] `A=  
{ d^Rea8  
 NOTIFYICONDATA data; m[nrr6 G"  
 data.cbSize=sizeof(NOTIFYICONDATA); o|APsQE  
 data.hWnd=GetSafeHwnd(); ~?Zm3zOCc2  
 data.uID=98; |`'WEe2  
 Shell_NotifyIcon(NIM_DELETE,&data); K(AZD&D  
 ShowWindow(SW_SHOW); #'97mg  
 SetForegroundWindow(); H`4KhdqR  
 ShowWindow(SW_SHOWNORMAL); riQ0'-p  
 bTray=FALSE; m$VCCDv  
} GO3KKuQ=  
qS?^(Vt|R  
void CCaptureDlg::OnChange() 5nXmaj  
{ t4UL|fI  
 RegisterHotkey(); V6&6I  
} 8M,$|\U  
%?BygG  
BOOL CCaptureDlg::RegisterHotkey() |#sY(1  
{ yeLd,M/I  
 UpdateData(); S;tvt/\!Z  
 UCHAR mask=0; _FkH;MGWS  
 UCHAR key=0; E-deXY  
 if(m_bControl) ,+v>(h>q  
  mask|=4; ^;[^L=}8$  
 if(m_bAlt) |Es,$  
  mask|=2; gkDXt^Ob  
 if(m_bShift) rQ(u@u;  
  mask|=1; C[CNJ66  
  key=Key_Table[m_Key.GetCurSel()]; $ve*j=p  
 if(bRegistered){ ft$!u-`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >]x%+@{|  
  bRegistered=FALSE; hX:yn:P~  
 } sj&1I.@,>  
 cMask=mask; z8j7K'vV1  
 cKey=key; W^i[7 r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A#gy[.Bb  
 return bRegistered; -PaR&0Tt  
} ;pqS|ayl  
v?l*jr1-2  
  四、小结 GQYB2{e>  
w& )ApfL  
  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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