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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: %y;Cgo[  
  |(a< b  
  一、实现方法 |JH1?n  
p)=Fi}#D\  
  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: #N"K4@]{  
9:l>FoXS  
#pragma data_seg("shareddata") `ynD-_fTN  
HHOOK hHook =NULL; //钩子句柄 w">p 8  
UINT nHookCount =0; //挂接的程序数目 efF>kcIC  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 N!F ;!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "J%/xj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey j*jO809%^  
static int KeyCount =0; hE>i~:~R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /xRPQ|  
#pragma data_seg() CCZ]`*wJ  
n.$wW =  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 @l:\Ka~TS  
JY tM1d  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: sX,oJIt  
64OgE!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )0JXUC e  
cKey,UCHAR cMask) RWi~34r  
{ wDV%.Cc  
 BOOL bAdded=FALSE; BJI R !J  
 for(int index=0;index<MAX_KEY;index++){ =?f\o*J)  
  if(hCallWnd[index]==0){ n1xN:A  
   hCallWnd[index]=hWnd; |:i``gFj  
   HotKey[index]=cKey; 6A]Ia4PL  
   HotKeyMask[index]=cMask; Svo gvn  
   bAdded=TRUE; GJY7vS^#  
   KeyCount++; 7usf^g[dh  
   break; 6 ztM(2[  
  } "$tP>PO{<  
 } D@(Y.&_  
 return bAdded; dkC[Jt  
} p`3pRrER  
//删除热键 {Ah\-{]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ||&EmH  
{ 0'm4 ) \  
 BOOL bRemoved=FALSE; }F1|& A  
 for(int index=0;index<MAX_KEY;index++){ ]3C&l+m$ot  
  if(hCallWnd[index]==hWnd){ X'Dg= |  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V11Zl{uOl  
    hCallWnd[index]=NULL; zM^ux!T=  
    HotKey[index]=0; )} y1  
    HotKeyMask[index]=0; eXI^9uH  
    bRemoved=TRUE; 2c.~cNx`q[  
    KeyCount--; /u }AgIb  
    break; E3\O?+ h#  
   } A`4j=OF\  
  } :mU,g|~55  
 } 9i8D_[  
 return bRemoved; D84`#Xbi  
} U<**Est  
`<h}Ygo>k/  
WVp7H  
  DLL中的钩子函数如下: dIG(7 ~  
)A a98Eu?2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {4g1Wr5=  
{ fMn7E8.  
 BOOL bProcessed=FALSE; z F'{{7o  
 if(HC_ACTION==nCode) -bK#&o,  
 { h:3`e`J<h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 HPAd@5d(  
   switch(wParam) vIrLG1EK  
   {  C G~ )`  
    case VK_MENU: [EDw0e  
     MaskBits&=~ALTBIT; >8~+[e  
     break; Lnnl++8Y  
    case VK_CONTROL: ` RUr/|S  
     MaskBits&=~CTRLBIT; yG5T;O&  
     break; "PBUyh-Z  
    case VK_SHIFT: t+k"$zR  
     MaskBits&=~SHIFTBIT; @ba5iIt  
     break;  s%Q pb{  
    default: //judge the key and send message -Rhxib|<  
     break; >+=)Q,|R  
   } \eE0Rnaf-  
   for(int index=0;index<MAX_KEY;index++){ BW}^n  
    if(hCallWnd[index]==NULL) M=$y_9#  
     continue; Cd.pMoS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !ec\8Tj  
    { jYet!l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); BYN<|=  
     bProcessed=TRUE; .}6 YKKqS  
    } 5@"&%8oeq0  
   } DNdwMSwp  
  } C:g2E[#  
  else if((lParam&0xc000ffff)==1){ //有键按下 >De\2gbJ  
   switch(wParam) y@J]busU  
   { lcij}-z:%e  
    case VK_MENU: 3ryIXC\v  
     MaskBits|=ALTBIT; W?!(/`J]  
     break; x2.G1  
    case VK_CONTROL: e =Vu;  
     MaskBits|=CTRLBIT; C_?L$3 U0  
     break; ]`&EB~K&NY  
    case VK_SHIFT: |C@)#.nm[  
     MaskBits|=SHIFTBIT; ho2o/>Ef3  
     break; n *%<!\gJ  
    default: //judge the key and send message 34 W#  
     break; 2i#wJ8vrF  
   } \pB"R$YZ6  
   for(int index=0;index<MAX_KEY;index++){ ?'p`Qv  
    if(hCallWnd[index]==NULL) eMVfv=&L<3  
     continue; b&A+`d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xvm.Un< N  
    { I+w3It  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |HJdpY>Uu  
     bProcessed=TRUE; q[Hx y  
    } Nhn5 iN1*  
   } ?@l9T)fF  
  } EXg\a#4['  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "?V4Tl~uu  
   for(int index=0;index<MAX_KEY;index++){ Qv,|*bf  
    if(hCallWnd[index]==NULL) ts3%cRN r  
     continue; 5UR$Pn2a2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V< 0gD?Kx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f3s0.G#l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N VzR2  
   } X^#48*"a  
  } bV&/)eqv  
 } FZz\z p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ot(U_rJCi  
} /sH3Rk.>  
m;lwMrY\7>  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ?UoA'~=  
afv? z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -]R7[5C:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fzRzkn:=  
ouK&H|'  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: P49lE  
97e fWYj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2BBGJE  
{ 7qV_QZ!.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) g}@_ @  
 { -7*,}xV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 /}-]n81m  
  SaveBmp(); Am%zEt$c  
  return FALSE; sAfSI<L_  
 } p@/!+$^{  
 …… //其它处理及默认处理 FEw51a+V  
} ;#I(ucB<  
dY68wW>d|  
`+1+0?9  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ooref orr  
mm'n#%\G  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 `MlQPLH  
&OK(6o2m;  
  二、编程步骤 #+|{l*>  
cP`f\\c  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; )\l}i%L:  
@zB{Ig  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GN?^7kI  
vXLiYWo  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; |3/=dG  
YH&`+ +  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; f%` =>l  
z*>"I  
  5、 添加代码,编译运行程序。 SN(:\|f 2  
)9 5&-Hs  
三、程序代码 {'E%SIRZ)  
1T!b# x4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "n," >  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) xmb]L:4F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ IkFrzw p  
#if _MSC_VER > 1000 v*<hE>J0  
#pragma once jxL} tS{j  
#endif // _MSC_VER > 1000 |sMRIW,P  
#ifndef __AFXWIN_H__ lPSyFb"  
#error include 'stdafx.h' before including this file for PCH {3@f(H m  
#endif v{$X2z_$w  
#include "resource.h" // main symbols /qed_w.p  
class CHookApp : public CWinApp ;"-(QE?Mv  
{ .C$S DhJ~  
 public: wUW^ O  
  CHookApp(); 4Pe%*WTX  
  // Overrides x5YW6R.<t  
  // ClassWizard generated virtual function overrides $[T^ S  
  //{{AFX_VIRTUAL(CHookApp) 'Xoif"  
 public: " JFx  
  virtual BOOL InitInstance(); [5e}A&  
  virtual int ExitInstance(); vP`Sz}FU  
  //}}AFX_VIRTUAL I;<0v@  
  //{{AFX_MSG(CHookApp) jOa . h  
  // NOTE - the ClassWizard will add and remove member functions here. 7"@^JxYN  
  // DO NOT EDIT what you see in these blocks of generated code ! d&4 ve Lu  
  //}}AFX_MSG JGOry \  
  DECLARE_MESSAGE_MAP() ,dhJ\cQ~  
}; m_zl*s*6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Ck d@|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u,AP$+Qk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ukpbx;O:hc  
BOOL InitHotkey(); i'OFun+-,  
BOOL UnInit(); 1K?RA*aj  
#endif gI "ZhYI  
x? tC2L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g= ~Y\$&  
#include "stdafx.h" CuC1s>  
#include "hook.h" M<^]Ywq*p  
#include <windowsx.h> +wc8rE6+W  
#ifdef _DEBUG qmqWMLfC  
#define new DEBUG_NEW u^|c_5J(  
#undef THIS_FILE {,NGxqhE  
static char THIS_FILE[] = __FILE__; *;t\!XDgp  
#endif ,`PC^`0c}o  
#define MAX_KEY 100 .2"-N5Z  
#define CTRLBIT 0x04 ?C)a0>L  
#define ALTBIT 0x02 7]W6\Z  
#define SHIFTBIT 0x01 8C]K36q  
#pragma data_seg("shareddata") ~hD!{([  
HHOOK hHook =NULL; -fpe  
UINT nHookCount =0; WX .Ax$fT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey scX'>\w&c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT pHQrjEF*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 94^)Ar~O  
static int KeyCount =0; V%h,JA  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XSk*w'xO  
#pragma data_seg() 2[|52+zhc  
HINSTANCE hins; =mR~\R( I  
void VerifyWindow(); z]_2lx2e  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L$L/5/  
//{{AFX_MSG_MAP(CHookApp) yPY}b_W  
// NOTE - the ClassWizard will add and remove mapping macros here. '8%jA$o\g  
// DO NOT EDIT what you see in these blocks of generated code! Y TpiOPf  
//}}AFX_MSG_MAP PAng(tubl  
END_MESSAGE_MAP() 8tfM,.]_i  
&O +?#3  
CHookApp::CHookApp() OQW%nF9~  
{ Kzwbr?&z  
 // TODO: add construction code here, "DaE(S&  
 // Place all significant initialization in InitInstance "&Hr)yyWG  
} 1lo. X_  
Q$ +6f,m#W  
CHookApp theApp; P:D;w2'Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8\WV.+  
{ RW~!)^  
 BOOL bProcessed=FALSE; m tU{d^B  
 if(HC_ACTION==nCode) {zX]4 1T  
 { Fn>KdoByN  
  if((lParam&0xc0000000)==0xc0000000){// Key up nQGl]2  
   switch(wParam) Ft E5H  
   { Zd5Jz+f  
    case VK_MENU: '9{`Czc(Gb  
     MaskBits&=~ALTBIT; R2Es~T  
     break; T:T`M:C.  
    case VK_CONTROL: K|pg'VT"  
     MaskBits&=~CTRLBIT; /< k&[  
     break; e ,kxg^  
    case VK_SHIFT: E5aRTDLq  
     MaskBits&=~SHIFTBIT; IR2=dQS  
     break; O&dBLh!G  
    default: //judge the key and send message f=k_U[b4>  
     break; }y%c.  
   } apOXcZ   
   for(int index=0;index<MAX_KEY;index++){ +7\d78U  
    if(hCallWnd[index]==NULL) pMHF u/|Pr  
     continue; InI>So%e|<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Brts ig,4  
    { X+1Mv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u,V_j|(e  
     bProcessed=TRUE; T;G<62`.h  
    } 6r|=^3{  
   } 7fI2b,~  
  } cJMi`PQ;  
  else if((lParam&0xc000ffff)==1){ //Key down +4$][3.  
   switch(wParam) PYBE?td  
   { \TZSn1isZX  
    case VK_MENU: v,C~5J3h)  
     MaskBits|=ALTBIT; a^={X<K|/  
     break; I8a3:)  
    case VK_CONTROL: ollsB3]]  
     MaskBits|=CTRLBIT; 'W,*mfB  
     break; 1fvN[  
    case VK_SHIFT: LSo*JO6  
     MaskBits|=SHIFTBIT; jST4O"DjM  
     break; [YP{%1*RM  
    default: //judge the key and send message $ay!'MK0d  
     break; W]oa7VAq  
   } T/A2Y+@N;  
   for(int index=0;index<MAX_KEY;index++) &r.M~k >  
   { 9dw* ++  
    if(hCallWnd[index]==NULL) p^|6 /b  
     continue; w >2sr^!y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |.,]0CRg  
    { pHuR_U5*?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^B0Qk:%P^N  
     bProcessed=TRUE; t7l{^d_L  
    } 5F+G8  
   } T60pw  
  } jz`3xFy *]  
  if(!bProcessed){ 7Q]c=i cg  
   for(int index=0;index<MAX_KEY;index++){ `LNhamp  
    if(hCallWnd[index]==NULL) iGSA$U P|  
     continue; Y/6>OD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `!t-$i  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~|9VVeE  
   } #CPLvg#  
  } 7UY4* j|[C  
 } 5[g\.yi2_]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ' Ut4=@)  
} ) [?xT  
#D/*<:q5  
BOOL InitHotkey() e@qH!.g)  
{ i^e8.zgywF  
 if(hHook!=NULL){ =w}JAEE|(i  
  nHookCount++; /q+;!EM  
  return TRUE; (M"rpG>L  
 } ,[IDC3.4^R  
 else mE`qA*=?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C+uW]]~I)  
  if(hHook!=NULL) %0}^M1  
   nHookCount++; zxx\jpBBk  
  return (hHook!=NULL); CxeW5qc  
} hiBsksZRnk  
BOOL UnInit() DrKB;6  
{ tnaFbmp  
 if(nHookCount>1){ 'St6a*  
  nHookCount--; h# "$W;(  
  return TRUE; {@ vnKyf^K  
 } 7jIBE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Nwz?*~1  
 if(unhooked==TRUE){ 4[@YF@_=M  
  nHookCount=0; s6@mXO:H^  
  hHook=NULL; E Izy  
 } }VZExqm)  
 return unhooked; m9oOH5@K~  
} @2/|rq  
Q}|K29Y:p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s{Y4wvQyB  
{ A vq+s.h  
 BOOL bAdded=FALSE; M/quswn1  
 for(int index=0;index<MAX_KEY;index++){ o]4\Geg$  
  if(hCallWnd[index]==0){ ^" X.aksA  
   hCallWnd[index]=hWnd; Os@b8V 8,A  
   HotKey[index]=cKey; 'ZW(Hjrd  
   HotKeyMask[index]=cMask; WJOoDS!i  
   bAdded=TRUE;  ~2"hh$  
   KeyCount++; qK a}O*  
   break; GYfOwV!zB  
  } [|OII!"  
 } P[ WkW#  
 return bAdded; Gv &G2^  
} +QU>D:l  
E(P 6s;LZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FKTF?4+\U  
{ ;"Kgg:K>W  
 BOOL bRemoved=FALSE; 5, 1<A@H  
 for(int index=0;index<MAX_KEY;index++){ z}ar$}T  
  if(hCallWnd[index]==hWnd){ cK+TE8ao  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y=P*   
    hCallWnd[index]=NULL; 'd+fGx7i  
    HotKey[index]=0; =Z  
    HotKeyMask[index]=0; Nnl3r@  
    bRemoved=TRUE; YpDJ(61+  
    KeyCount--; |nZ^RCHog  
    break; aDK b78 1d  
   } TC?B_;a  
  } P9bM+@5e  
 } X ha9x,  
 return bRemoved; :3n@].  
} #[#evlr=  
jW\:+Taq  
void VerifyWindow() {R!yw`#^B  
{ ZwS:Te9-  
 for(int i=0;i<MAX_KEY;i++){  ma~#E$i&  
  if(hCallWnd!=NULL){ \b"rf697 ,  
   if(!IsWindow(hCallWnd)){ E$)|Kv^  
    hCallWnd=NULL; WR)=VE   
    HotKey=0; %xg+UW }  
    HotKeyMask=0;  2h   
    KeyCount--; Mj MDD  
   } KGy 3#r;Q  
  } G%erh}0~  
 } ep"[; $Eb  
} il5C9ql$  
f+^6.%  
BOOL CHookApp::InitInstance() m1X7zUCy  
{ &u.{]Yjx  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \)6glAtN  
 hins=AfxGetInstanceHandle(); x%}D+2ro-t  
 InitHotkey(); u#@/^h;  
 return CWinApp::InitInstance(); W%!(kN&d  
} hpAdoy[  
$N=&D_Q  
int CHookApp::ExitInstance() R |c=I }@F  
{ xm{]|~^JG  
 VerifyWindow(); OyZR&,q  
 UnInit(); JN0h3nZ_  
 return CWinApp::ExitInstance(); + Q-b}  
} z qeQ  
j>\c > U  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file IL].!9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z+El(f x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h<G4tjtk  
#if _MSC_VER > 1000 i.Rl&t  
#pragma once jSY[Y:6md  
#endif // _MSC_VER > 1000 VsQ|t/|#  
] 3{t}qY$A  
class CCaptureDlg : public CDialog 5*YoK)2J  
{ |p6d]#z3  
 // Construction rwF$aR>9  
 public: TEC^|U`G  
  BOOL bTray; c{=Sy;i@  
  BOOL bRegistered; $o[-xNn1  
  BOOL RegisterHotkey(); J/je/PC  
  UCHAR cKey; &h334N|4{  
  UCHAR cMask; h Qn?qJy%W  
  void DeleteIcon(); <~ smBd  
  void AddIcon(); p;+O/'/j  
  UINT nCount; N[I@}j  
  void SaveBmp(); RQ,#TbAe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor D\Ak-$kJ^  
  // Dialog Data QL/KY G  
  //{{AFX_DATA(CCaptureDlg) A[Mke  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~:a1ELqVw  
  CComboBox m_Key; UM7@c7B?  
  BOOL m_bControl; {[H_Vl@  
  BOOL m_bAlt; C*Vm}|)  
  BOOL m_bShift; {D4FYr J  
  CString m_Path; 6@N,'a8r  
  CString m_Number; *2/Jg'de  
  //}}AFX_DATA axC|,8~tq  
  // ClassWizard generated virtual function overrides ,;g%/6X  
  //{{AFX_VIRTUAL(CCaptureDlg) P@7>R7gS  
 public: <0CjEsAB]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); NHd@s#@  
 protected: KL&/Yt   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2 *NPK}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Rt8[P6e"q  
  //}}AFX_VIRTUAL B.8B1MFm  
  // Implementation 6 4_}"fU  
 protected: V?{d<Ng~J  
  HICON m_hIcon; nrl?<4 _  
  // Generated message map functions ,h*gd^i  
  //{{AFX_MSG(CCaptureDlg) N*Aw-\Bk  
  virtual BOOL OnInitDialog(); N<)CG,/w[M  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @>8(f#S%  
  afx_msg void OnPaint(); 7Nq< o5  
  afx_msg HCURSOR OnQueryDragIcon(); Vebv!  
  virtual void OnCancel(); YdhTjvx  
  afx_msg void OnAbout(); r[L.TX3Ah=  
  afx_msg void OnBrowse(); 9Dx~! (  
  afx_msg void OnChange(); ._}}@V_/  
 //}}AFX_MSG LqWiw24#  
 DECLARE_MESSAGE_MAP() E|@C:ghG  
}; 4S_f2P2J  
#endif S2$E`' J  
qezWfR`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,?GwA@~$k:  
#include "stdafx.h" Sy8t2lk  
#include "Capture.h" =3bk=vy  
#include "CaptureDlg.h" ;8]HCC@:  
#include <windowsx.h> s%jBIeh  
#pragma comment(lib,"hook.lib") J n.7W5v  
#ifdef _DEBUG iXWHI3  
#define new DEBUG_NEW uKJ:)oyaCP  
#undef THIS_FILE 4$Ai!a  
static char THIS_FILE[] = __FILE__; B {Cm`f8E  
#endif R$:-~<O  
#define IDM_SHELL WM_USER+1 @@ Q4{o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zIc6L3w$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FQWjL>NB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; UFB|IeX?q  
class CAboutDlg : public CDialog YgEd%Z%4  
{  /~"-q  
 public: .eJKIck  
  CAboutDlg(); Vl5r~+$|  
  // Dialog Data Igo`\JY  
  //{{AFX_DATA(CAboutDlg) 5U?O1}P  
  enum { IDD = IDD_ABOUTBOX }; QV[&2&&^<<  
  //}}AFX_DATA yX&# rI  
  // ClassWizard generated virtual function overrides 0LQRQuh1  
  //{{AFX_VIRTUAL(CAboutDlg) #}~tTL  
 protected: 9wL2NC31Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7ZUN;mr  
  //}}AFX_VIRTUAL 0F$|`v"0  
  // Implementation | R,dsBd  
 protected: PF4[;E S'  
  //{{AFX_MSG(CAboutDlg) UynGG@P@  
  //}}AFX_MSG A;U c&G  
  DECLARE_MESSAGE_MAP() QYA4C1h'  
}; cj>@Jx}]M  
sUF$eVAT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h[(YH ;Y  
{ ^A ]4  
 //{{AFX_DATA_INIT(CAboutDlg) Ijh RSrCv  
 //}}AFX_DATA_INIT AH,?B*zGj  
} K'&,]r#  
fN9{@)2Mz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !WyJ@pFU^  
{ r6S  
 CDialog::DoDataExchange(pDX); TXB!Y!RG#  
 //{{AFX_DATA_MAP(CAboutDlg) Z_ElLY  
 //}}AFX_DATA_MAP \%r#>8c8  
} r'i99 ~  
Rxy|Ag/I;V  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) kHK<~srB  
 //{{AFX_MSG_MAP(CAboutDlg) $ DN.  
 // No message handlers U`*we43  
 //}}AFX_MSG_MAP _kD5pC =  
END_MESSAGE_MAP() lg|6~=aQ  
h#zm+([B*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) i}T* | P  
: CDialog(CCaptureDlg::IDD, pParent) xbiprhdv  
{ M.g2y&8  
 //{{AFX_DATA_INIT(CCaptureDlg) wGO-Z']i  
  m_bControl = FALSE; H;=yR]E  
  m_bAlt = FALSE; Yyk~!G/@  
  m_bShift = FALSE; sD3Ts;k  
  m_Path = _T("c:\\"); }%KQrlbHJl  
  m_Number = _T("0 picture captured."); "|6(.S+o  
  nCount=0; S%RxYJ(  
  bRegistered=FALSE; b8a (.}8*  
  bTray=FALSE; 6Emn@Mn=  
 //}}AFX_DATA_INIT uNf'Zeo  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <@7j37,R7V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); za6 hyd^  
} R655@|RT  
R/{h4/+vJ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .3EEi3z6z  
{ 3g7]$}  
 CDialog::DoDataExchange(pDX); 1=]#=)+  
 //{{AFX_DATA_MAP(CCaptureDlg) $bp'b<jx  
  DDX_Control(pDX, IDC_KEY, m_Key); D u<P^CE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); X}B] 5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &Zz&VwWR  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8h ol4'B  
  DDX_Text(pDX, IDC_PATH, m_Path); 0,0WdJAe  
  DDX_Text(pDX, IDC_NUMBER, m_Number); y1`%3\  
 //}}AFX_DATA_MAP T3b0"o27  
} }5EH67  
,$]m1|t@z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +^:uPW^U  
//{{AFX_MSG_MAP(CCaptureDlg) ufR|V-BWx  
 ON_WM_SYSCOMMAND() d Np%=gIj  
 ON_WM_PAINT() #W:.Fsq  
 ON_WM_QUERYDRAGICON() &'\-M6GW  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) pTAm}  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UHJro9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ZV Ko$q:F  
//}}AFX_MSG_MAP ycN!N  
END_MESSAGE_MAP() PR;Bxy  
''2:ZXX  
BOOL CCaptureDlg::OnInitDialog() 6@Q; LV+  
{ .WglLUJ:Z  
 CDialog::OnInitDialog(); L <  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s#~VN;-I  
 ASSERT(IDM_ABOUTBOX < 0xF000); &IQNsJL!e  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r0z8?  
 if (pSysMenu != NULL) .yDR2 sW  
 { CS%ut-K<5M  
  CString strAboutMenu; ZrYRLg  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 1xxTI{'g[  
  if (!strAboutMenu.IsEmpty()) BDN}`F[F  
  { p7},ymQ|YQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 7\dt<VV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Sn97DCdk  
  } B4OFhtYE  
 } }T%E;m-  
 SetIcon(m_hIcon, TRUE); // Set big icon 1% @i4  
 SetIcon(m_hIcon, FALSE); // Set small icon gC6Gm':c  
 m_Key.SetCurSel(0); ~Q- /O~  
 RegisterHotkey(); i&HU7mP/  
 CMenu* pMenu=GetSystemMenu(FALSE); W__$ i<1  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); UXa%$gwFw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B_!S\?}$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Xk^<}Ep)c  
 return TRUE; // return TRUE unless you set the focus to a control "97sH_ ,  
} f`}u9!jVR  
Kd}%%L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .Sm 8t$  
{ RaiYq#X/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {s@&3i?ZiC  
 {  LWo)x  
  CAboutDlg dlgAbout; JpQV7}$  
  dlgAbout.DoModal(); lfoPFJ Z  
 } 8yr-X!eF  
 else 3&X5*-U  
 { 'fb&3  
  CDialog::OnSysCommand(nID, lParam); ]<},[s  
 } 7CT446  
} .j!:Hp(z}  
2V @ pt  
void CCaptureDlg::OnPaint()  @C'qbO{  
{ nCldH|>5w  
 if (IsIconic()) RZvRV?<bR  
 { ~N2 [j  
  CPaintDC dc(this); // device context for painting i;2V   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B(@uJ^N  
  // Center icon in client rectangle q!d7Ms{q  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]VVx2ERs  
  int cyIcon = GetSystemMetrics(SM_CYICON); iA2TvP#  
  CRect rect; m,J9:S<5;  
  GetClientRect(&rect); FOa2VP%  
  int x = (rect.Width() - cxIcon + 1) / 2; s 4 Uk5<  
  int y = (rect.Height() - cyIcon + 1) / 2; Si;eBPFH  
  // Draw the icon kKQD$g.z6  
  dc.DrawIcon(x, y, m_hIcon); %e: hVU  
 } l) Cg?9  
 else g C@=]Y  
 { 1 RyvPP  
  CDialog::OnPaint(); AQ-R^kT  
 } O sIvW'$\  
} &53LJlL Co  
G*VcAJ [  
HCURSOR CCaptureDlg::OnQueryDragIcon() Yu%ZwTvw  
{ A*{V%7hs&  
 return (HCURSOR) m_hIcon; r2;+ACwWf_  
} ;>p{|^X0D  
uoY]@.  
void CCaptureDlg::OnCancel() Nrp1`qY  
{ 4!+IsT  
 if(bTray) j W|M)[KJN  
  DeleteIcon(); 9&4z4@on  
  CDialog::OnCancel(); CJLfpvV  
} j&?@:Zg v  
0bIhP,4&  
void CCaptureDlg::OnAbout() grCz@i  
{ yzCamm4~0  
 CAboutDlg dlg; o 3 G*   
 dlg.DoModal(); z!9w Lo^r  
} W GMEZx  
ADZU?7)  
void CCaptureDlg::OnBrowse() fH 5/  
{ JLxAk14lc  
 CString str; gM#]o QOGE  
 BROWSEINFO bi; X pf:I  
 char name[MAX_PATH]; X04JQLhy"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lGN{1djT  
 bi.hwndOwner=GetSafeHwnd(); [)p>pA2GZj  
 bi.pszDisplayName=name; I_h&35^t  
 bi.lpszTitle="Select folder"; 2HREO@._)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ON3~!Q)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); >^KO5N-:4  
 if(idl==NULL) r7:4| 6E  
  return; xcl8q:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pj'[ H  
 str.ReleaseBuffer(); v+`gQXJ"G  
 m_Path=str; .37Jrh0Iv  
 if(str.GetAt(str.GetLength()-1)!='\\') zC\L-i>G  
  m_Path+="\\"; !.5,RIf  
 UpdateData(FALSE); 4T:@W C  
} &Ukh  
_"c?[n  
void CCaptureDlg::SaveBmp() PeB7Q=d)K1  
{ ER$qL"H U  
 CDC dc; +dSO?Y]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Xkb\fR6<K  
 CBitmap bm; w97%5[-T  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2~*.X^dR  
 int Height=GetSystemMetrics(SM_CYSCREEN); S_56!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L(qQ,1VY  
 CDC tdc; r5aOQ  
 tdc.CreateCompatibleDC(&dc); *U^7MU0  
 CBitmap*pOld=tdc.SelectObject(&bm); Wi{ jC?2Q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !@kwHJkv  
 tdc.SelectObject(pOld); (\NZ)Ys  
 BITMAP btm; OAZ5I)D>  
 bm.GetBitmap(&btm); >FM2T<.;  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;V\l, u  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s8 0$   
 BITMAPINFOHEADER bih; ":N E I  
 bih.biBitCount=btm.bmBitsPixel; uz;z+Bd^  
 bih.biClrImportant=0; <2{-ey]  
 bih.biClrUsed=0; OB5`a,5dI  
 bih.biCompression=0; > hmBV7nR  
 bih.biHeight=btm.bmHeight; a@V`EEZ  
 bih.biPlanes=1; W~FM^xR?p  
 bih.biSize=sizeof(BITMAPINFOHEADER); z#elwL6  
 bih.biSizeImage=size; _"0Bg3Y  
 bih.biWidth=btm.bmWidth; +(3U_]Lu  
 bih.biXPelsPerMeter=0; K.K=\ Y2  
 bih.biYPelsPerMeter=0; uMe]].04  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hUGP3ExC*  
 static int filecount=0; }&O}t{gS*  
 CString name; S4FR=QuVQC  
 name.Format("pict%04d.bmp",filecount++); W #kOcw  
 name=m_Path+name; JQ)w/@Vu=  
 BITMAPFILEHEADER bfh; ;4ETqi9  
 bfh.bfReserved1=bfh.bfReserved2=0; m<uBRI*I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "WE*ED  
 bfh.bfSize=54+size; fTg^~XmJ  
 bfh.bfOffBits=54; +GqUI~a  
 CFile bf; hMvLx>q3)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ KN-)m ta&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Pwg?a  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0B?t:XU,  
  bf.WriteHuge(lpData,size); TmIw?#q^  
  bf.Close(); :N ~A7@  
  nCount++; L1J~D?q  
 } Y<0R5rO  
 GlobalFreePtr(lpData); .8EaFEd  
 if(nCount==1) XIJW$CY  
  m_Number.Format("%d picture captured.",nCount); B78e*nNS#2  
 else _)? 59  
  m_Number.Format("%d pictures captured.",nCount); n6]8W^g  
  UpdateData(FALSE); MYVgi{  
} 0<C]9[l  
 &@h(6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QlCs ,bT  
{ VuWBWb?0Q  
 if(pMsg -> message == WM_KEYDOWN) R+y 9JE  
 { 7dbGUbT  
  if(pMsg -> wParam == VK_ESCAPE) ?(d<n   
   return TRUE; oi:!YVc  
  if(pMsg -> wParam == VK_RETURN) 6w Y6* R  
   return TRUE; )eaEc9o>  
 } :sL?jGk\  
 return CDialog::PreTranslateMessage(pMsg); 4V9S~^v|  
} 5:sk&0:@U  
$)6%LG_@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M6o"|\  
{ wYAi-gdOi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kMP3PS  
  SaveBmp(); |qFCzK9tD/  
  return FALSE; }5qpiS"V9  
} 1 ms(03dp  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oW \k%Vj  
 CMenu pop; $]t3pAI[H0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oDBv5  
 CMenu*pMenu=pop.GetSubMenu(0); +zf[Im%E  
 pMenu->SetDefaultItem(ID_EXITICON); 7U, [Ruu  
 CPoint pt; \]=''C=J  
 GetCursorPos(&pt); Z&W*@(dX  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); p.|NZXk%%a  
 if(id==ID_EXITICON) V>Vu)7  
  DeleteIcon(); X&14;lu%p  
 else if(id==ID_EXIT) y}bliN7;1e  
  OnCancel(); O~ ]3.b  
 return FALSE; y8arFG  
} y1c2(K>tu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); M!)~h<YL  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #M~6A^)  
 AddIcon(); a*(,ydF|L  
 return res; {|D7H=f  
} 8%Eau wAx  
]u<8j r  
void CCaptureDlg::AddIcon() xg8$ <Ut  
{ x>TIQU=\  
 NOTIFYICONDATA data; ziTE*rNJ  
 data.cbSize=sizeof(NOTIFYICONDATA); la}Xo0nq0+  
 CString tip; BDiN*.w5  
 tip.LoadString(IDS_ICONTIP); ^Ez`WP  
 data.hIcon=GetIcon(0); !/RL.`!>  
 data.hWnd=GetSafeHwnd(); QopA'm  
 strcpy(data.szTip,tip); ')#!M\1,HQ  
 data.uCallbackMessage=IDM_SHELL; ews{0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xjK@Q1MJ  
 data.uID=98; +ko-oZ7V  
 Shell_NotifyIcon(NIM_ADD,&data); # m;|QWW  
 ShowWindow(SW_HIDE); |\3X7)^8D  
 bTray=TRUE; E,p4R%:$@1  
} PyQ P K,  
/k O <o&  
void CCaptureDlg::DeleteIcon() 0n-S%e5  
{ {&,MkWgG  
 NOTIFYICONDATA data; fuao*L]  
 data.cbSize=sizeof(NOTIFYICONDATA); ~lH_d[  
 data.hWnd=GetSafeHwnd(); :-)H tyzf  
 data.uID=98; 'M!*Ge  
 Shell_NotifyIcon(NIM_DELETE,&data); ;@$v_i   
 ShowWindow(SW_SHOW); GA+#'R  
 SetForegroundWindow(); 8RaRXnJ  
 ShowWindow(SW_SHOWNORMAL); &r0U9J  
 bTray=FALSE; M>g%wg7Ah  
} i8|0zI  
bTepTWv  
void CCaptureDlg::OnChange() .6HHUy  
{ $3)Z>p   
 RegisterHotkey(); e.VR9O]G  
} -ztgirU  
_Qd C V`  
BOOL CCaptureDlg::RegisterHotkey() %D6HY^]ayw  
{ Bh ,GQHJ  
 UpdateData(); ZBsV  
 UCHAR mask=0; 'gv ~M_  
 UCHAR key=0; y1OpZ  
 if(m_bControl) _?rL7oTv  
  mask|=4; nv'YtmR  
 if(m_bAlt) q)Qg'l^f  
  mask|=2; *wp>a?sG\  
 if(m_bShift) _Y _v&  
  mask|=1; C2(VYw  
  key=Key_Table[m_Key.GetCurSel()]; wzf%~ats  
 if(bRegistered){ L<W2a(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &<oJw TC  
  bRegistered=FALSE; 2`P=ekF]  
 } `PS^o#  
 cMask=mask; v4Mn@e_#c  
 cKey=key; aaRc?b'/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uRCZGg&V?#  
 return bRegistered; 4#Cm5xAt6  
}  4"~F  
Zg=jDPt}  
  四、小结 HIsB)W&%@  
dh K<5E  
  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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