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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: 2A|mXWG}~  
  \kKd:C{  
  一、实现方法 z|],s]F>G  
-]}#Z:&  
  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: lmUCrs37  
5`&@3 m9/  
#pragma data_seg("shareddata") 4`o0?_.'  
HHOOK hHook =NULL; //钩子句柄 vq9O|E3  
UINT nHookCount =0; //挂接的程序数目 IDpLf*vSG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @ g`|ob]9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )(.g~Q:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8cvSA&l(D  
static int KeyCount =0; 0iC5,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @N[<<k7g  
#pragma data_seg() -#;ZZ \fdj  
L$"x*2[A  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 BE&8E\w  
*1-0s*T  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: JgHYuLB  
dg*xo9Xi`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR EJz!#f~  
cKey,UCHAR cMask) . WJ  
{ Q~ Nq5[  
 BOOL bAdded=FALSE; +B8oW3v# )  
 for(int index=0;index<MAX_KEY;index++){ {=Ji2k0U'  
  if(hCallWnd[index]==0){ rFt +Y})  
   hCallWnd[index]=hWnd; gkTwGI+w  
   HotKey[index]=cKey; -;6uN\gq  
   HotKeyMask[index]=cMask; r$M<vo6C  
   bAdded=TRUE; &xUCXj2-z  
   KeyCount++; Wn=I[K&&  
   break; t:oq't  
  } BINHCZ  
 } =^Ws/k  
 return bAdded; (7,Q4T  
} c3rj :QK6I  
//删除热键 opn6 C )  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wNl6a9#  
{ *'-C/  
 BOOL bRemoved=FALSE; /_expSPHl  
 for(int index=0;index<MAX_KEY;index++){ v`'Iew }  
  if(hCallWnd[index]==hWnd){ h(~of (  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4/\Ynb.L  
    hCallWnd[index]=NULL; }h/7M  
    HotKey[index]=0; Ap"%%D^{:  
    HotKeyMask[index]=0; Q;y4yJ$wI  
    bRemoved=TRUE; 5>e<|@2 X  
    KeyCount--; YsiH=x  
    break; dKXzFyW  
   } J?t(TW6E  
  } ow`F 7  
 } 9T$%^H9  
 return bRemoved; &.yX41R  
} dpge:Qhr  
Zn*W2s^^{  
(}T},ygQ  
  DLL中的钩子函数如下: |V}tTx1  
?qHQ#0 @y]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :KRNLhWb  
{ I_?R(V[9  
 BOOL bProcessed=FALSE; dF! B5(  
 if(HC_ACTION==nCode) 41.xi9V2  
 { X?u=R)uG  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 xr Ne:Aj  
   switch(wParam) &F;bg  
   {  n^55G>"0|  
    case VK_MENU: jC>mDnX  
     MaskBits&=~ALTBIT; U"UsQYa_  
     break; @kT@IQkri  
    case VK_CONTROL: i-WP#\s  
     MaskBits&=~CTRLBIT; &>Y.$eW_  
     break; |yj0Rv  
    case VK_SHIFT: wwR}h I(  
     MaskBits&=~SHIFTBIT;  fOsvOC  
     break; |,TBP@  
    default: //judge the key and send message /-^{$$eu  
     break; XMI5j7C L  
   } F$|d#ny  
   for(int index=0;index<MAX_KEY;index++){ 8OS^3JS3"  
    if(hCallWnd[index]==NULL) _\@zq*E  
     continue; ,N_V(Cx5pt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5[*8C Y  
    { *[jq&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nD 4C $  
     bProcessed=TRUE; |XQ\c.A  
    } By*YBZ  
   } e!w{ap8u  
  } tk 5 p@l  
  else if((lParam&0xc000ffff)==1){ //有键按下 .k up[d(  
   switch(wParam) Y)GU{  
   { . Wd0}?}  
    case VK_MENU: ?c_:S]^  
     MaskBits|=ALTBIT; oj?y_0}:^  
     break; "9vL+Hh  
    case VK_CONTROL: UH(w, R`  
     MaskBits|=CTRLBIT; v y-(:aH7U  
     break; R:^jQ'1  
    case VK_SHIFT: }U}ppq0Eo  
     MaskBits|=SHIFTBIT; 0E3;f;'X  
     break; QQ =tiW  
    default: //judge the key and send message W=HHTvK9Hh  
     break; ]_!NmB_3  
   } \x\(36\u  
   for(int index=0;index<MAX_KEY;index++){ @,G\` ;Ma  
    if(hCallWnd[index]==NULL) LH@Kn?R6  
     continue; 2>CR]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HB<>x  
    { +n &8" )  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F,mStw:  
     bProcessed=TRUE; 5VVU%STP  
    } >B$ IrM7J  
   } lEQj62zIQ  
  } iK5[P  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }-Nc}%5  
   for(int index=0;index<MAX_KEY;index++){ i\4YT r,  
    if(hCallWnd[index]==NULL) c|iTRco  
     continue; ,x3< a}J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VYH $em6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :yw(Co]f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -0k{O@l"  
   } 4zOFu/l6R  
  } C(xsMO'k,,  
 } #>z!ns  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;c@B+RquR  
} I34 1s0  
1:|o7`  
  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: Iy4 RE P|  
OzTR#`oey  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ( p CU:'"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^7:UC\_  
(2RuQgO  
  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: B\ZCJaMb  
^%U`|GBZp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +t]Ge >S  
{ J'I1NeK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +}mj;3i  
 { (K ]wk9a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,a0RI<D  
  SaveBmp(); fQw=z$  
  return FALSE; lm{4x~y$h  
 } VEL!-e^X&  
 …… //其它处理及默认处理 3r?T|>|  
} 3n_t^=  
K'K/}q<  
LF:~& m  
  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。 XHJ/211  
6jov8GIAt  
  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。 J0t_wM Ja  
*~UK5Brf1  
  二、编程步骤 z4]z3U<}3]  
AZ\f6r{  
  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"; `0 W+(9}  
$9 G".T  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; d]?fL&jr  
0yb9R/3.  
  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; YEB7X>p#  
VAdUd {  
  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; g/i.b&  
{3Dm/u%=9|  
  5、 添加代码,编译运行程序。 ')WS :\J  
2UBAk')O}  
三、程序代码 T-js*  
A#F6~QX(.9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL PFbkkQKsT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ++|e z{  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ btDTC 9O  
#if _MSC_VER > 1000 Izfq`zS+\s  
#pragma once O? 7hT!{  
#endif // _MSC_VER > 1000 _~y-?(46K  
#ifndef __AFXWIN_H__ mF>{cVTF  
#error include 'stdafx.h' before including this file for PCH {JfL7%  
#endif nbDjoZZ4  
#include "resource.h" // main symbols IY@N  
class CHookApp : public CWinApp OskQ[ e0  
{ H<*n5r(c  
 public: 5VGZ5,+<<  
  CHookApp(); 7e)j|a-!<  
  // Overrides }fhGofN$e  
  // ClassWizard generated virtual function overrides m9ky?A,  
  //{{AFX_VIRTUAL(CHookApp) PoRP]Q*n  
 public: 4`?WdCW8  
  virtual BOOL InitInstance(); 'SWK{t \4  
  virtual int ExitInstance(); +a+DiD>./  
  //}}AFX_VIRTUAL v#5hK<9  
  //{{AFX_MSG(CHookApp) 8'Q&FW3"  
  // NOTE - the ClassWizard will add and remove member functions here. ji5Nq+S2  
  // DO NOT EDIT what you see in these blocks of generated code ! $A98h -*x  
  //}}AFX_MSG k+eeVy  
  DECLARE_MESSAGE_MAP() 1<0Z@D~F  
}; B2)5Z]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <II>io ;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fV!~SX6S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?]_A~_J!  
BOOL InitHotkey(); - G=doP0  
BOOL UnInit(); U@}P]'`'f  
#endif `mS0]/AV/  
7aHP;X~0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. )s ?Hkn  
#include "stdafx.h" |tFg9RT  
#include "hook.h" ~#=70  
#include <windowsx.h> Ece=loV*l  
#ifdef _DEBUG hz-^9U  
#define new DEBUG_NEW U@LIw6B!KL  
#undef THIS_FILE }l5Q0'  
static char THIS_FILE[] = __FILE__; }#Kl6x  
#endif A aM~B`B  
#define MAX_KEY 100 1f$1~5Z  
#define CTRLBIT 0x04 X9YbTN  
#define ALTBIT 0x02 ;jmT5XzL  
#define SHIFTBIT 0x01 #*"I?B/fd8  
#pragma data_seg("shareddata") 8HWEObRY  
HHOOK hHook =NULL; fQ f5%  
UINT nHookCount =0; 3AcDW6x|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey EB p(^r j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2=n,{rkmj%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $N4i)>&T2  
static int KeyCount =0; cM=_i{c  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift M1K[6V!   
#pragma data_seg() =BeJ.8$@VC  
HINSTANCE hins; 6PLdzZ{  
void VerifyWindow(); \Bl`;uXb  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i >BQRbU  
//{{AFX_MSG_MAP(CHookApp) p '=XW#2 >  
// NOTE - the ClassWizard will add and remove mapping macros here. R1Q~UX]d=  
// DO NOT EDIT what you see in these blocks of generated code! or[!C %  
//}}AFX_MSG_MAP 2'}/aL|G  
END_MESSAGE_MAP() w2V:g$~,  
2&2t8.<  
CHookApp::CHookApp() q=26($  
{ U)_x(B3d/  
 // TODO: add construction code here, 0He^r &c3  
 // Place all significant initialization in InitInstance hhJs$c(  
} BHS8MV L@  
@KU^B_{i  
CHookApp theApp; (_Rl f$D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;@<e]Ft  
{ gzp]hh@4  
 BOOL bProcessed=FALSE; if+97^Oy  
 if(HC_ACTION==nCode) @[O|n)7  
 { P2 z~U  
  if((lParam&0xc0000000)==0xc0000000){// Key up [:l=>yJ{(  
   switch(wParam) KK/siG~O  
   { 2Jt*s$  
    case VK_MENU: F2',3  
     MaskBits&=~ALTBIT; %5<Xa  
     break; y+M9{[ i/O  
    case VK_CONTROL: @zig{b8  
     MaskBits&=~CTRLBIT; >8gb/?z  
     break; Q\z9\mMG-  
    case VK_SHIFT: F?4&qbdD  
     MaskBits&=~SHIFTBIT; i5czm?x  
     break; UQJ  
    default: //judge the key and send message 3moDu  
     break; o#V{mm,{Pm  
   } ,BlNj^5f  
   for(int index=0;index<MAX_KEY;index++){ knRs{1}Pw{  
    if(hCallWnd[index]==NULL) ^x}k1F3  
     continue; B?;P:!/1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Jy-V\.N>s  
    { 8LGNV&Edg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OJ<V<=MYZ  
     bProcessed=TRUE; l'Uj"9r,  
    } {\n?IGP?wd  
   } uiaZ@  
  } P:m6:F@hO  
  else if((lParam&0xc000ffff)==1){ //Key down N[sJ5oF  
   switch(wParam) Rrp-SR?O  
   { A 7zL\U4  
    case VK_MENU: nZ# 0L`@"Y  
     MaskBits|=ALTBIT; _O`s;oc  
     break; J QA]O/|N  
    case VK_CONTROL: P u,JR  
     MaskBits|=CTRLBIT; +?GsIp@>jh  
     break; rpv<'$6  
    case VK_SHIFT: b yX)4&  
     MaskBits|=SHIFTBIT; e0`5PVJ  
     break; &>vfm9  
    default: //judge the key and send message Z \;{e'#o  
     break; 1raq;^e9  
   } @ gjA8mL  
   for(int index=0;index<MAX_KEY;index++) e^orqw/I  
   { oN=>U"<\1  
    if(hCallWnd[index]==NULL) bA/'IF+  
     continue; Z4D[nPm$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t+A9nvj)  
    { QJU\YH%}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A%.ZesjAx  
     bProcessed=TRUE; >]ZW.?1h  
    } uQz!of%x  
   } 1F{,Zr  
  } K8fC>iNbH  
  if(!bProcessed){ ]eo%eaA   
   for(int index=0;index<MAX_KEY;index++){ >4nQ&b.u  
    if(hCallWnd[index]==NULL) B;J8^esypD  
     continue; b}Xh|0`b+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) nc.:Wm6Mj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p4z thdN[  
   } Qv1cf  
  } ria.MCe\!  
 } WO[O0!X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nt7z ]F`  
} Uh3N#O  
6-f-/$B  
BOOL InitHotkey() ,7SqR Y,+  
{ :rEZR`  
 if(hHook!=NULL){ #E4|@}30`  
  nHookCount++; PgYIQpV  
  return TRUE; &|fWtl;43  
 } 'oF('uR  
 else oe[f2?-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :O]US)VSj  
  if(hHook!=NULL) aJ J63aJ  
   nHookCount++; f;obK~b[  
  return (hHook!=NULL); 4,?WNPqo  
} q;QE(}.g  
BOOL UnInit() & DhdB0Hjf  
{ .T#}3C/  
 if(nHookCount>1){ E*d UJ.>  
  nHookCount--; jm,cVo  
  return TRUE; Sn[/'V^$a  
 } )&93YrHgC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v>0} v)<v  
 if(unhooked==TRUE){ wx_j)Wij6  
  nHookCount=0; - 9a4ej5  
  hHook=NULL; fxc?+<P  
 } "0J;H#Y"#  
 return unhooked; o~26<Lk  
} &o'$uLF~Y  
c uHF^l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^#4Ah[:XA  
{ Oe lf^&m  
 BOOL bAdded=FALSE; <yw56{w,  
 for(int index=0;index<MAX_KEY;index++){ XCyrr 2^  
  if(hCallWnd[index]==0){ M[ ON2P;  
   hCallWnd[index]=hWnd; ^SW0+O  
   HotKey[index]=cKey; B{>x  
   HotKeyMask[index]=cMask; Y-~ M kB  
   bAdded=TRUE; OOnhT  
   KeyCount++; zEYQZywc  
   break; HSEz20s  
  } ]E#W[6'VtB  
 } #{@qC2!2/  
 return bAdded; _,3%)sn-)  
} z[0tM&pv  
yacN=]SW5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $ J!PSF8PL  
{ X~Hm.qIR  
 BOOL bRemoved=FALSE; >~L0M  
 for(int index=0;index<MAX_KEY;index++){ .H Pa\b\L>  
  if(hCallWnd[index]==hWnd){ ~#7uNH2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H/ar: j  
    hCallWnd[index]=NULL; \w)ddc!ZS  
    HotKey[index]=0; VXl|AA<OG  
    HotKeyMask[index]=0; t\f[->f  
    bRemoved=TRUE; v[O?7Np  
    KeyCount--; -@.FnFa  
    break; `bF4/iBW  
   } 2IXtIE  
  } ywA7hm  
 }  vPAL,  
 return bRemoved; hP$5>G(3  
} 5 hW#BB  
jOm7:+H  
void VerifyWindow() cJzkA^T9  
{ |nBZ:$D  
 for(int i=0;i<MAX_KEY;i++){  '3xK1Am  
  if(hCallWnd!=NULL){ l YpoS  
   if(!IsWindow(hCallWnd)){ Ru4M7 %  
    hCallWnd=NULL; u@t~*E5BpM  
    HotKey=0; YI2x*t!  
    HotKeyMask=0; 4<Kxo\\S  
    KeyCount--; svtqX-Vj"  
   } ?%$~Bb _  
  } yYdh+x  
 } d '\ ^S}  
} 0 gR_1~3  
S }qGf%  
BOOL CHookApp::InitInstance() rA}mp]  
{ _%(.OR  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *0'< DnGW  
 hins=AfxGetInstanceHandle(); 3 6t^iV*3  
 InitHotkey(); BDLJDyf B  
 return CWinApp::InitInstance(); g!^mewtd  
} _} K3}}  
P3v4!tR  
int CHookApp::ExitInstance() PW\me7iCz  
{ 3gtKD9RL:  
 VerifyWindow(); -B#K}xL|x  
 UnInit(); 1 ]ePU8  
 return CWinApp::ExitInstance(); m$7C{Mr'  
} +'_ peT.8  
,\N4tG1\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MHJRBn{}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O+]'*~a  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1C0' Gf)3  
#if _MSC_VER > 1000 XW~a4If  
#pragma once LMuDda  
#endif // _MSC_VER > 1000 #Y'ewu;qJ  
p-H}NQ\  
class CCaptureDlg : public CDialog T[MDjhv'  
{ I]BhkJ  
 // Construction ZO>)GR2S  
 public: [}l#cG6 k  
  BOOL bTray; RDEK=^J  
  BOOL bRegistered; c )=a;_h  
  BOOL RegisterHotkey(); 4vV\vXT*  
  UCHAR cKey; KY?ujeF  
  UCHAR cMask; .yD5>iBh  
  void DeleteIcon(); 4'Y a-x x  
  void AddIcon(); s\p 1EL(  
  UINT nCount; _%#Uh#7P$  
  void SaveBmp(); NMUF)ksjN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [3x},KM  
  // Dialog Data i*@ZIw  
  //{{AFX_DATA(CCaptureDlg) 00@F?|-j  
  enum { IDD = IDD_CAPTURE_DIALOG }; =sF4H_B  
  CComboBox m_Key; r_kaS als  
  BOOL m_bControl; f,ZJFb98  
  BOOL m_bAlt; .o]9 HbIk5  
  BOOL m_bShift; 6C\WX(@4  
  CString m_Path; A (H2Gt D  
  CString m_Number; U>@AE  
  //}}AFX_DATA u"m TS&  
  // ClassWizard generated virtual function overrides BCtKxtbS  
  //{{AFX_VIRTUAL(CCaptureDlg) wN^^_  
 public: Ao#bREm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); { SDnVV  
 protected: C_yNSD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .[Qi4jm>`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \fp'=&tp~a  
  //}}AFX_VIRTUAL  cp0yr:~  
  // Implementation A4Q{(z-?  
 protected: 5rmQ:8_5  
  HICON m_hIcon; | GN/{KH]  
  // Generated message map functions 'p@m`)Z  
  //{{AFX_MSG(CCaptureDlg) )0g!lCfb  
  virtual BOOL OnInitDialog(); `gyk e2n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /F6"uZSt4  
  afx_msg void OnPaint(); 5K-,k^T}  
  afx_msg HCURSOR OnQueryDragIcon(); *Uy;P>8  
  virtual void OnCancel(); WD! " $  
  afx_msg void OnAbout(); RxNLn/?d@  
  afx_msg void OnBrowse(); c6AwO?x/  
  afx_msg void OnChange(); fzOh3FO+  
 //}}AFX_MSG mA"[x_  
 DECLARE_MESSAGE_MAP() piqh7u3~  
}; Ya(3Z_f+VZ  
#endif vU(fd!V ?  
v*c"SI=@M=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7|jy:F,w%  
#include "stdafx.h" VLJ]OW8cO  
#include "Capture.h" 1/&^~'  
#include "CaptureDlg.h" J #jFX F\  
#include <windowsx.h> 2cSc 8  
#pragma comment(lib,"hook.lib") B I=57  
#ifdef _DEBUG !;P[Y"h@r  
#define new DEBUG_NEW 0d1!Q!PH3  
#undef THIS_FILE S!b?pl  
static char THIS_FILE[] = __FILE__; kUfbB#.5L  
#endif N(3Bzd)   
#define IDM_SHELL WM_USER+1 kDxI7$]E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EBiLe;=X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sH'0utD#Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IiJ$Ng  
class CAboutDlg : public CDialog t=|}?lN<  
{ gZBKe!@a|  
 public: ]7oo`KcQ|  
  CAboutDlg(); ?GqH/ (O  
  // Dialog Data $yq76  
  //{{AFX_DATA(CAboutDlg) QpRk5NeLe  
  enum { IDD = IDD_ABOUTBOX }; H9(UzyN>i  
  //}}AFX_DATA W39J)~D^@  
  // ClassWizard generated virtual function overrides 6q!Q(_  
  //{{AFX_VIRTUAL(CAboutDlg) o6:bmKWE  
 protected: ] SLeWs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AEDBr<  
  //}}AFX_VIRTUAL 6y57m;JW/  
  // Implementation (ti!Y"e2  
 protected: o*2Mjd]r  
  //{{AFX_MSG(CAboutDlg) 9U4[o<G]=  
  //}}AFX_MSG Z9q4W:jyS  
  DECLARE_MESSAGE_MAP() `Q#)N0  
}; NeP  
+XW1,ly~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) qg|ark*1u  
{ Gm\)1b  
 //{{AFX_DATA_INIT(CAboutDlg)  Z'l!/l!  
 //}}AFX_DATA_INIT U<>@)0~7g!  
} ZS=;)  
q&_\A0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @&%/<|4P5  
{ :UAcS^n7h"  
 CDialog::DoDataExchange(pDX); />pAZa  
 //{{AFX_DATA_MAP(CAboutDlg) k\9kOZW  
 //}}AFX_DATA_MAP QDVSFGwr  
} X.FoX  
~4O3~Y_+GN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 5wha _Yet  
 //{{AFX_MSG_MAP(CAboutDlg) I+SfZ:q ^  
 // No message handlers <#199`R  
 //}}AFX_MSG_MAP /q,=!&f2  
END_MESSAGE_MAP() H8B2{]HAt  
;uv$>F auk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !VsdKG)  
: CDialog(CCaptureDlg::IDD, pParent) Sa0IRC<LV  
{ TTbJ9O<43  
 //{{AFX_DATA_INIT(CCaptureDlg) s&Al4>}.f  
  m_bControl = FALSE; cIC/3g}]  
  m_bAlt = FALSE; {'B(S/Z 7  
  m_bShift = FALSE; >j*0fb!:]  
  m_Path = _T("c:\\"); s{{8!Q  
  m_Number = _T("0 picture captured."); 'tcve2Tt  
  nCount=0; zAvI f  
  bRegistered=FALSE; @<X[,Mj  
  bTray=FALSE; ,fN <I  
 //}}AFX_DATA_INIT ZNpC& "`G  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 A$n.'*gK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >{-rl@^H:  
} 6ecx!uc$  
)8'v@8;-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  vILB$%I  
{ mwN "Cu4t  
 CDialog::DoDataExchange(pDX); y4aT-^C'  
 //{{AFX_DATA_MAP(CCaptureDlg) %e)vl[:}  
  DDX_Control(pDX, IDC_KEY, m_Key); Y,EF'Ot  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +JY8"a97>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); UV av^<_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (Q ^=^s|  
  DDX_Text(pDX, IDC_PATH, m_Path); w5rtYT I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6c27X/'Z  
 //}}AFX_DATA_MAP ="f-I9y  
} Io>U-Zd\>  
"}ur"bU1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gB+CM? LKq  
//{{AFX_MSG_MAP(CCaptureDlg) ygX!'evY  
 ON_WM_SYSCOMMAND() ,,6lQ]wG  
 ON_WM_PAINT() ;-l^X%r  
 ON_WM_QUERYDRAGICON() |nr;OM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }H saJ=1U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RBg2iG$ 8|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $G9E=wn  
//}}AFX_MSG_MAP d{) =E8wE  
END_MESSAGE_MAP() &B=z*m  
'J!Gip ,  
BOOL CCaptureDlg::OnInitDialog() yB=R7E7  
{ 2 n2,MB  
 CDialog::OnInitDialog(); rg#/kd<?[V  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;~WoJlEK3  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7}~nQl2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .x/H2r'1  
 if (pSysMenu != NULL) !vc 5NKv#n  
 { 4ji'6JHPg  
  CString strAboutMenu; xaV3N[Zd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +l!.<:sp  
  if (!strAboutMenu.IsEmpty()) ,zH\P+*  
  { 3,{;wJ Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); NwQ$gDgu t  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3UZ_1nY  
  } 4`cfFowK~  
 } {ehYE^%N  
 SetIcon(m_hIcon, TRUE); // Set big icon x^Qij!mB%  
 SetIcon(m_hIcon, FALSE); // Set small icon gvo5^O+)HH  
 m_Key.SetCurSel(0); uH7rt  
 RegisterHotkey(); 1DL+=-  
 CMenu* pMenu=GetSystemMenu(FALSE); Wf%)::G*uR  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (Ia:>ocE0  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HM"(cB(n`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); RU=g|TL  
 return TRUE; // return TRUE unless you set the focus to a control ^YfAsBs&  
} 3/& |Z<f  
Z/v )^VR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B>z^W+Unyn  
{ Ae2Y\sAV  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @E h(GZN  
 { Q&%gpa ).W  
  CAboutDlg dlgAbout; zJ ;]z0O  
  dlgAbout.DoModal(); <Nc9F['&#  
 } *laFG <;  
 else 3O2vY1Y2  
 { QV*la=j/  
  CDialog::OnSysCommand(nID, lParam); 0TICv2l!  
 } '=Jz}F <  
} >qGWDCKr  
20`XklV  
void CCaptureDlg::OnPaint() L]BTX]  
{ 73tjDO7d  
 if (IsIconic()) d)XT> &  
 { r8FAV9A  
  CPaintDC dc(this); // device context for painting ^<v.=7cL0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  60f%J1u  
  // Center icon in client rectangle ?6I`$ &OA  
  int cxIcon = GetSystemMetrics(SM_CXICON); A^0-%Ygl  
  int cyIcon = GetSystemMetrics(SM_CYICON); gB,Q4acjj  
  CRect rect; 4xFAFK~lx  
  GetClientRect(&rect); @:!%Z`  
  int x = (rect.Width() - cxIcon + 1) / 2; mt e3k=17  
  int y = (rect.Height() - cyIcon + 1) / 2; XoMgb DC  
  // Draw the icon HBk5 p>&  
  dc.DrawIcon(x, y, m_hIcon); R\$6_  
 } 40-/t*2Ly  
 else ]Rp<64I o  
 { v{\~>1J{  
  CDialog::OnPaint(); |ZCv>8?n  
 } P5"B7>L:  
} "[Tr"nI  
Kj6+$l   
HCURSOR CCaptureDlg::OnQueryDragIcon() 6e}T zc\@(  
{ A?)(^  
 return (HCURSOR) m_hIcon; nRX<$OzTV  
} 8@T0]vH&  
G~Y#l@8M+  
void CCaptureDlg::OnCancel() Xa&:Hg<  
{ AJzm/,H  
 if(bTray) lWf(!=0m  
  DeleteIcon(); ?:zMrlX  
  CDialog::OnCancel(); Ox'K C  
} :n x;~f  
SBw'z(U  
void CCaptureDlg::OnAbout() _,-\;  
{ [~Z#yEiW^  
 CAboutDlg dlg; ' 94HVag  
 dlg.DoModal(); C|QJQ@bj0  
} tfe'].uT  
Z@Qf0 c  
void CCaptureDlg::OnBrowse() 2"Y=*s  
{ 1fF\k#BE-%  
 CString str; ;{n*F=%uC  
 BROWSEINFO bi; 0upZ4eN  
 char name[MAX_PATH]; , -Lv3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |:SXN4';?  
 bi.hwndOwner=GetSafeHwnd(); i'#%t/ u  
 bi.pszDisplayName=name; 8mX:*$qm:  
 bi.lpszTitle="Select folder"; Io_7  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Z \ -  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <)@^TRS  
 if(idl==NULL) _&xkj8O  
  return; fAvB!e  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %';DBozZ   
 str.ReleaseBuffer(); |e3YTLsI  
 m_Path=str; RWn#"~  
 if(str.GetAt(str.GetLength()-1)!='\\') MpJx>0j/J  
  m_Path+="\\"; [@s5v  
 UpdateData(FALSE); bW'Y8ok[v  
} eA/}$.R  
a6o p  
void CCaptureDlg::SaveBmp() A?c?(~9O  
{ Gs}lw'pK  
 CDC dc; jg3['hTJT  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l02aXxT)]  
 CBitmap bm; .fY$$aD$4  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;Y(~'KF  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8@I.\u)0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); + V-&?E(  
 CDC tdc;  HYg7B  
 tdc.CreateCompatibleDC(&dc); K%vGfQ8Er-  
 CBitmap*pOld=tdc.SelectObject(&bm); UAdj [m61  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /B  
 tdc.SelectObject(pOld); jbTyM"Y  
 BITMAP btm; cACnBgLl  
 bm.GetBitmap(&btm); OL#RkD  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [dXRord  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h6(L22Hn  
 BITMAPINFOHEADER bih; .O.fD  
 bih.biBitCount=btm.bmBitsPixel; WJ]g7!Ks  
 bih.biClrImportant=0; :#W>lq@H  
 bih.biClrUsed=0; vYG$>*  
 bih.biCompression=0; Aj=c,]2  
 bih.biHeight=btm.bmHeight; R~BW=Dz,e  
 bih.biPlanes=1; W{;LI WsZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); d _koF-7  
 bih.biSizeImage=size; fP1fm  
 bih.biWidth=btm.bmWidth; mDU-;3OqF  
 bih.biXPelsPerMeter=0; qk(u5Z  
 bih.biYPelsPerMeter=0; *(<3 oIRS  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dtq]_HvTJ  
 static int filecount=0; yAVt[+0  
 CString name; v y F(k3W  
 name.Format("pict%04d.bmp",filecount++); &oiBMk`*  
 name=m_Path+name; z[_Gg8e  
 BITMAPFILEHEADER bfh; O<w7PS  
 bfh.bfReserved1=bfh.bfReserved2=0; pJwy ~ L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GP}+c8|2  
 bfh.bfSize=54+size; *|:]("i  
 bfh.bfOffBits=54; v_@&#!u`  
 CFile bf; k\M">K0E  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2c<phmiK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *r]#jY4qx  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~wRozV  
  bf.WriteHuge(lpData,size); Z7R+'OC  
  bf.Close(); 4'# _b  
  nCount++; OKzk\F6  
 } =t-503e.J  
 GlobalFreePtr(lpData); ::kpAE]  
 if(nCount==1) JTB5#S4W  
  m_Number.Format("%d picture captured.",nCount); aD3Q-a[  
 else 5($ '@u  
  m_Number.Format("%d pictures captured.",nCount); N DV_/BI  
  UpdateData(FALSE); S>p>$m, Q  
} DnPV Tp(>  
cj/FqU"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nyB~C7zR  
{ "A9 c]  
 if(pMsg -> message == WM_KEYDOWN) cb~m==G  
 { \>-%OcYlM  
  if(pMsg -> wParam == VK_ESCAPE) U z6XQskX  
   return TRUE; mCx6$jz  
  if(pMsg -> wParam == VK_RETURN) O k~\  
   return TRUE; zHCz[jlrMq  
 } U=bZy,FT$  
 return CDialog::PreTranslateMessage(pMsg); 7e&%R4{b  
} v<Ux+-  
[t`QV2um  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _/!IjB:(70  
{ c8jq.y v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ u5FlT3hY.  
  SaveBmp(); = 8%+$vX  
  return FALSE; bx<7@  
} /P|jHK|{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ FeFH_  
 CMenu pop; #VEHyz6P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I2'UC) 0  
 CMenu*pMenu=pop.GetSubMenu(0); _sCpyu  
 pMenu->SetDefaultItem(ID_EXITICON); P1ab2D  
 CPoint pt; *l^%7W rk  
 GetCursorPos(&pt); 4<&`\<jZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ABp/uJI)  
 if(id==ID_EXITICON) 5<ycF_  
  DeleteIcon(); u|D_"q~+6  
 else if(id==ID_EXIT) zW^@\kB0D  
  OnCancel(); NUH#  
 return FALSE; /P0%4aWu=  
} H;$OCDRC  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |ldRs'c{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K(HP PM\  
 AddIcon(); l8hOryB&  
 return res; [?hc.COE  
} o3l_&?^  
Xu:S h<:R  
void CCaptureDlg::AddIcon() OPwj*b:-m  
{ ( Qw"^lE3  
 NOTIFYICONDATA data; dg1h<]T"9  
 data.cbSize=sizeof(NOTIFYICONDATA); .Eg>)  
 CString tip; @vaK-&|#$  
 tip.LoadString(IDS_ICONTIP); Vj"B#  
 data.hIcon=GetIcon(0); v }ZQC8wL  
 data.hWnd=GetSafeHwnd(); eg-,;X#  
 strcpy(data.szTip,tip); K/jC>4/c/  
 data.uCallbackMessage=IDM_SHELL; {@oYMO~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kGMI ?  
 data.uID=98; 7PZ0  
 Shell_NotifyIcon(NIM_ADD,&data); rr# &0`]  
 ShowWindow(SW_HIDE); Khxl 'qj  
 bTray=TRUE; ALiXT8q  
} \5Jpr'mY5  
DxT8;`I%  
void CCaptureDlg::DeleteIcon() gX34'<Z  
{ *#,wV  
 NOTIFYICONDATA data; Jx@3zl  
 data.cbSize=sizeof(NOTIFYICONDATA); .4~n|d>z  
 data.hWnd=GetSafeHwnd(); \0m[Ch}~ey  
 data.uID=98; 70L{u+wIy  
 Shell_NotifyIcon(NIM_DELETE,&data); </|IgN$w`  
 ShowWindow(SW_SHOW);  `' 5(4j  
 SetForegroundWindow(); (AdQ6eGMb  
 ShowWindow(SW_SHOWNORMAL); Q%(LMq4UG  
 bTray=FALSE; W^q;=D6uh  
} |[?"$g9v  
".eD&oX{  
void CCaptureDlg::OnChange() Z*QsDS  
{ nJ4i[j8  
 RegisterHotkey(); Qsc%qt-l  
} /4]M*ls  
QOkPliX  
BOOL CCaptureDlg::RegisterHotkey() m-UI^M,@<  
{ nqt;Ge M  
 UpdateData(); &V[m{.  
 UCHAR mask=0; q7C>A`w  
 UCHAR key=0; XU .FLNe  
 if(m_bControl) WLEjRx  
  mask|=4; uHUicZf.  
 if(m_bAlt) V7!x-E/  
  mask|=2; C9U~lcIS  
 if(m_bShift) *S_eYKSl  
  mask|=1; Dg4 ?,{c9W  
  key=Key_Table[m_Key.GetCurSel()]; rm NqS+t  
 if(bRegistered){ p UWj,&t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Zycu3%JI  
  bRegistered=FALSE;  tQB+_q z  
 } =9e( )j  
 cMask=mask; 3ADT Yt".  
 cKey=key; ` IiAtS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]C-hl}iq  
 return bRegistered; ]%3o"|  
} g6k@E,cI_  
YsXP$y]g-  
  四、小结 z{cIG8z  
]n0kO&  
  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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