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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: zl8O @g  
  pK/r{/>r  
  一、实现方法 v__n>*x  
3azyqpwU$  
  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: |qe[`x; %  
`b.KMOn  
#pragma data_seg("shareddata") ]=Im0s  
HHOOK hHook =NULL; //钩子句柄 SLI(;, s  
UINT nHookCount =0; //挂接的程序数目 /Mq9~oC  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .T;:6/??1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $#2zxpr,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o_=t9\:  
static int KeyCount =0; /qf(5Bm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2;&K*>g&.  
#pragma data_seg() B<^yT@Wc  
ITpo:"X g  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 )T2V< 3l  
w4I&SLm-b  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \.!+'2!m  
e3T&KyPm?+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5D9n>K4|  
cKey,UCHAR cMask) ?xkw~3Yfi  
{ `4GEq2%  
 BOOL bAdded=FALSE; ^LAP*R  
 for(int index=0;index<MAX_KEY;index++){ lQ5d.}O&  
  if(hCallWnd[index]==0){ o;w 5;TkY  
   hCallWnd[index]=hWnd; !Q/oj Q  
   HotKey[index]=cKey; U1oZ\Mh  
   HotKeyMask[index]=cMask; K14FY2"  
   bAdded=TRUE; u?Pec:3%  
   KeyCount++; [2~^~K  
   break; d`eX_]Z  
  } b({K6#?'[  
 } S1d^mu  
 return bAdded; :`jB1rI  
} goa@ e  
//删除热键 w?;j5[j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]{.iv_I  
{ @la/sd4`  
 BOOL bRemoved=FALSE; 8rV"? m`S  
 for(int index=0;index<MAX_KEY;index++){ zeqwmV=  
  if(hCallWnd[index]==hWnd){ v,}Mn7:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x`3F?[#l  
    hCallWnd[index]=NULL; ab-z 7g  
    HotKey[index]=0; `#g62wb,HY  
    HotKeyMask[index]=0; ~-J!WC==U  
    bRemoved=TRUE; d+m}Z>iQ1O  
    KeyCount--; }Mv$Up  
    break; u)X]]6YJ  
   } :ebu8H9f%  
  } #aHJ|[[(n  
 } $V/Hr/0  
 return bRemoved; i #pBzJ  
} qpt},yn)C  
Cf~ vT"  
LdH23\  
  DLL中的钩子函数如下:  U))2?#  
#B$r|rqamq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s!g06F  
{ 59R%g .2Y  
 BOOL bProcessed=FALSE; ;:WM^S  
 if(HC_ACTION==nCode) uge~*S  
 { r*F^8_YMK  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +sY8<y@%  
   switch(wParam) z JBcz,  
   {  +<})`(8  
    case VK_MENU:  gl$}t H  
     MaskBits&=~ALTBIT;  9M]%h  
     break; 6&,{"N0 T  
    case VK_CONTROL: , tEd>  
     MaskBits&=~CTRLBIT; ~9We)FvU4  
     break; S\poa:D`  
    case VK_SHIFT: [Dq@(Q s'  
     MaskBits&=~SHIFTBIT; hJc^NU5  
     break; ;5dA  
    default: //judge the key and send message bxc!x>)  
     break; SuJa?VU1w  
   } fD* ?JzVY  
   for(int index=0;index<MAX_KEY;index++){ qx'F9I  
    if(hCallWnd[index]==NULL) #;(Q \  
     continue; F'^y?UP[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `Q1;Y  
    { h 7/wkv\y9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O>c2*9PM  
     bProcessed=TRUE; BD_"w]bqD  
    } )b=m|A GX  
   } T/Bx3VWL  
  } S-7ryHH*0  
  else if((lParam&0xc000ffff)==1){ //有键按下 c#L.I  
   switch(wParam) sUl _W"aQ  
   { D/`b ~Yl  
    case VK_MENU: gyT3[*eh  
     MaskBits|=ALTBIT; |h 3`z  
     break; :c3'U_H^  
    case VK_CONTROL: p5V.O20  
     MaskBits|=CTRLBIT; +eVm+4WK  
     break; ":vF[6K6  
    case VK_SHIFT: 3bK=Q3N  
     MaskBits|=SHIFTBIT; EJm*L6>@R&  
     break; 1\LK[tvh  
    default: //judge the key and send message @tfatq+q  
     break; /I@`B2  
   } Y{`hRz`  
   for(int index=0;index<MAX_KEY;index++){ *USzzLq  
    if(hCallWnd[index]==NULL) XJguw/[wm  
     continue; q6T>y%|FZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Pm=i(TBS/  
    { eFz!`a^dX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 52v@zDY  
     bProcessed=TRUE; A5 <T7~U  
    } rXF=/  
   } (@3?JJ]1  
  } r34 GO1d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 J]gtgt^   
   for(int index=0;index<MAX_KEY;index++){ ZK?:w^Z  
    if(hCallWnd[index]==NULL) ,/Yo1@U  
     continue; Lv<)Dur0K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _n12Wx{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FX&)~)  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p}MH LM  
   } e)Pm{:E  
  } fK1^fzV  
 } J?[}h&otQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G&,2>qxK R  
} EWp'zbWP  
NVG`XL  
  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: IEQ6J}L  
12S[m~L%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N,?D<NjXl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dY$jg  
*rmwTD"  
  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: 9 :FzSD  
uTIl} N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l EsE]f  
{ 1IeB_t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) n,o;:c  
 { idGhWV'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J%ue{PL7  
  SaveBmp(); Ku<_N]9  
  return FALSE; }< m@82\  
 } 1Jn:huV2  
 …… //其它处理及默认处理 ~\~XD+jy"  
} yL%k5cO$N  
}c;h:CE#  
L}.V`v{zc  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 :taRCh5  
[.*o< KP  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 P(XNtQ=K  
fH[:S9@  
  二、编程步骤 !|;w(/  
2apQ4)6#[H  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";  i'NN  
:rX/I LAr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; n$YCIW )0  
@V5'+^O  
  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; G[[NDK  
^bckl tSo  
  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; pgU4>tyD  
9KLhAYaq  
  5、 添加代码,编译运行程序。 }dSxrT  
J"O#w BM9  
三、程序代码 j,CMcP7A -  
m[!AOln)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL >6cENe_@t  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :fE*fU@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `<kV)d%xEF  
#if _MSC_VER > 1000 MB] Y|Vee  
#pragma once +gsk}>"  
#endif // _MSC_VER > 1000 DU: sQS4  
#ifndef __AFXWIN_H__ d8T,33>T  
#error include 'stdafx.h' before including this file for PCH #p^r)+\3=  
#endif B\ a#Vtyut  
#include "resource.h" // main symbols  !B\[Q$  
class CHookApp : public CWinApp QWWoj[d#  
{ NurbioFL  
 public: j[o5fr)L  
  CHookApp(); q;a#?Du o  
  // Overrides DUK.-|a7  
  // ClassWizard generated virtual function overrides ;q&\>u:  
  //{{AFX_VIRTUAL(CHookApp) UZUG ?UUM  
 public: -?AaRwZ,  
  virtual BOOL InitInstance(); m%?b"kxL[  
  virtual int ExitInstance(); |Zo_x} 0  
  //}}AFX_VIRTUAL _*w}"\4_  
  //{{AFX_MSG(CHookApp) 4D\+_Ic3  
  // NOTE - the ClassWizard will add and remove member functions here. ,Uv8[ci%9  
  // DO NOT EDIT what you see in these blocks of generated code ! f{[,!VG  
  //}}AFX_MSG e`Z3{H}  
  DECLARE_MESSAGE_MAP() YJ{d\j  
}; 1yIo 'i1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .DkDMg1US  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L5*,l`lET  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  8E!I9z  
BOOL InitHotkey(); TAt9+\'  
BOOL UnInit(); ,`JXBI~  
#endif ^D0BGC&&  
"@[xo7T  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .W+ F<]r  
#include "stdafx.h" WPM<Qv L  
#include "hook.h" XU#nqvS`.  
#include <windowsx.h> :`ysq  
#ifdef _DEBUG w5(GRAH  
#define new DEBUG_NEW Z0e+CEzq  
#undef THIS_FILE C4P7,  
static char THIS_FILE[] = __FILE__; /fM6%V=Y  
#endif jdYv*/^  
#define MAX_KEY 100 |k4ZTr]?  
#define CTRLBIT 0x04 q61 rNOw_  
#define ALTBIT 0x02 )>LC*_v  
#define SHIFTBIT 0x01 r4c3t,L*$I  
#pragma data_seg("shareddata") G r;~P*  
HHOOK hHook =NULL; \[+\JWJj  
UINT nHookCount =0; "Rp]2'?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey dkQA[/k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nA]dQ+5sT  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey BVC{Zq6hi  
static int KeyCount =0; Fq5);sX=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0OMyE9jJJ  
#pragma data_seg() B|O/h! H.  
HINSTANCE hins; q t}[M|Q^r  
void VerifyWindow(); qpl"j-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ~j\/3;^s   
//{{AFX_MSG_MAP(CHookApp) CW=-@W7  
// NOTE - the ClassWizard will add and remove mapping macros here. EtH)E)  
// DO NOT EDIT what you see in these blocks of generated code! "A:wWb<m  
//}}AFX_MSG_MAP Ffm Q$>S  
END_MESSAGE_MAP() | ~G;M*q  
=P+S]<O  
CHookApp::CHookApp() vAJfMUlP  
{ z~oGd,  
 // TODO: add construction code here, _+8$=k2nM  
 // Place all significant initialization in InitInstance }# -N7=h  
} J 6S  
<v('HLA  
CHookApp theApp; r`cCHZo/V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b@f. Kd7I  
{ b}$m!c:<8  
 BOOL bProcessed=FALSE; Te> 7I  
 if(HC_ACTION==nCode) qgca4VV|z  
 { y( MF_'l  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7@DinA!  
   switch(wParam) jq["z<V )x  
   { @/JGC%!  
    case VK_MENU: PSHs<Z47  
     MaskBits&=~ALTBIT; A}\Rms 2  
     break; ^%d+nKx9nL  
    case VK_CONTROL: \FTv N  
     MaskBits&=~CTRLBIT; hP,1;`[1  
     break; ,h]N*Z-I"  
    case VK_SHIFT: ?k_=?m  
     MaskBits&=~SHIFTBIT; _'AIXez7q  
     break; V_}`2.Pg  
    default: //judge the key and send message y::;e#.  
     break; ORx,n7-  
   } =QyO$:t  
   for(int index=0;index<MAX_KEY;index++){ IFPywL{K  
    if(hCallWnd[index]==NULL) ~ilbW|s?=k  
     continue; (p14{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N"t, 6tH  
    { .(S,dG0P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /p>"|z  
     bProcessed=TRUE; 6XQ)Q)  
    } 66'TdF]"  
   } }C#YR( ]  
  } 6w}:w?=6  
  else if((lParam&0xc000ffff)==1){ //Key down MO#%w  
   switch(wParam) m2|0<P@k!  
   { !gf&l ^)  
    case VK_MENU: 'KQu z)-  
     MaskBits|=ALTBIT; 5Cy)#Z{  
     break; VY _(0  
    case VK_CONTROL: 2 yP#:T/z  
     MaskBits|=CTRLBIT; $LRFG(  
     break; Ya9uu@F  
    case VK_SHIFT: q]Qgg  
     MaskBits|=SHIFTBIT; i]$d3J3  
     break; 82)d.>  
    default: //judge the key and send message ]K9 x<@!  
     break; j9u-C/Q\r  
   } ?>o39|M_w  
   for(int index=0;index<MAX_KEY;index++) LOida#R  
   { "W+4`A(/l  
    if(hCallWnd[index]==NULL) .X2mEnh  
     continue; c>UITM=!I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2CxdNj  
    { C}1(@$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0KDDAkR5R  
     bProcessed=TRUE; ,Fr{i1Ky  
    } z|b4w7 I  
   } &6\rKOsn  
  } y ph  
  if(!bProcessed){ p[o2F5 T2  
   for(int index=0;index<MAX_KEY;index++){ #^v5Eo  
    if(hCallWnd[index]==NULL) E?XA/z !  
     continue; >leOyBEAR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r>)\"U#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g(5s{njL  
   } Oy|9po  
  } lHGv:TN  
 } zWY6D4   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @W @L%<  
} g{J3Ba  
9M7P]$^  
BOOL InitHotkey() ev?>Nq+Z  
{ d;;=s=j  
 if(hHook!=NULL){ )nJ>kbO~8  
  nHookCount++; _?r+SRFn  
  return TRUE; 2d>PN^x  
 } ifgaBXT55  
 else ~b7Nzzfo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s=q+3NTv  
  if(hHook!=NULL) -xcz+pHQ  
   nHookCount++; e+6~JbMV  
  return (hHook!=NULL); FFQF0.@EBi  
} 2)8lJXM$L  
BOOL UnInit() Sc0ZT/Lm  
{ MYx*W7X  
 if(nHookCount>1){ F@I_sGCcb  
  nHookCount--; $o@?D^  
  return TRUE; uVO9r-O8p  
 } JV/,QWar  
 BOOL unhooked = UnhookWindowsHookEx(hHook); { &qBr&kg  
 if(unhooked==TRUE){ b R6bS7$  
  nHookCount=0; aFSZYyPxwv  
  hHook=NULL; ,f1wN{P  
 } I&xRK'  
 return unhooked; Q.|2/6hD7[  
} {'ZnxK'  
|-|BM'Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A |&EI-In  
{ r"Bf@va  
 BOOL bAdded=FALSE; _ xC~44  
 for(int index=0;index<MAX_KEY;index++){ -12v/an]L7  
  if(hCallWnd[index]==0){ 1=D!C lcb  
   hCallWnd[index]=hWnd; g/@CESfm'  
   HotKey[index]=cKey; 67g/(4&  
   HotKeyMask[index]=cMask; qQ_B[?+W  
   bAdded=TRUE; i Bi/9  
   KeyCount++; L9kP8&&KK  
   break; )} #r"!  
  } LH_2oJ\  
 } CeJ|z {F\  
 return bAdded;  A:!{+  
} >r*Zm2($MR  
j;y|Ys)I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c1 <g!Q&E  
{ 7/1S5yUr|  
 BOOL bRemoved=FALSE; #SXXYh-e  
 for(int index=0;index<MAX_KEY;index++){ B%pvk.`  
  if(hCallWnd[index]==hWnd){ ]@P*&FRcZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w#1dO~  
    hCallWnd[index]=NULL; t}tKm  
    HotKey[index]=0; @$*c0 . |z  
    HotKeyMask[index]=0; 96.Wfx  
    bRemoved=TRUE; <#Lw.;(U;k  
    KeyCount--; h>/ViB@"W|  
    break; vuZ<'?Nm  
   } L~$RF {$  
  } xH0/R LK3J  
 } 9VByFQgM  
 return bRemoved; :1=?/8h  
} _"bx#B*  
d5\1-d_uz  
void VerifyWindow() op*+fJHD  
{ }';&0p2Z  
 for(int i=0;i<MAX_KEY;i++){ kT1lOP-Bg  
  if(hCallWnd!=NULL){ VJ"3G;;  
   if(!IsWindow(hCallWnd)){ ~<%cc+;`  
    hCallWnd=NULL; U)!AH^{32  
    HotKey=0; 8if"U xV(  
    HotKeyMask=0; v(^rq  
    KeyCount--; f+6l0@K2  
   } GCKl [<9*  
  } US|vYd}u+  
 } 0o]K6 b  
} >+#[O"  
JW\"S  
BOOL CHookApp::InitInstance() +Xp;T`,v  
{ -AT@M1K7%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zT% kx:Fk  
 hins=AfxGetInstanceHandle(); rYJ ))@  
 InitHotkey(); R}>Do=hAO  
 return CWinApp::InitInstance(); B`F82_O  
} yjq )}y,tF  
D'h2 DP!  
int CHookApp::ExitInstance() 6{ Nbe=  
{ [1C#[Vla  
 VerifyWindow(); f#~Re:7.c  
 UnInit(); ge[i&,.&z  
 return CWinApp::ExitInstance(); ?5Fj]Bk]  
} 0Nu]N)H5<l  
,&=`T 7i  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h 3&:"*A2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )rj mJ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [}2.CM  
#if _MSC_VER > 1000 Pb,^UFa=  
#pragma once  o,yvi  
#endif // _MSC_VER > 1000 yLx.*I^6  
[ q&J"dt  
class CCaptureDlg : public CDialog q,DX{:  
{ dX*>?a  
 // Construction zmFFBf"<  
 public: o0'av+e7  
  BOOL bTray; xgz87d/<:  
  BOOL bRegistered; |^Es6 .~  
  BOOL RegisterHotkey(); 2M?lgh4"  
  UCHAR cKey; {nefS\#{  
  UCHAR cMask; .6 NSt  
  void DeleteIcon(); hYn'uL^~[  
  void AddIcon(); 6bNW1]rD  
  UINT nCount; ,[\(U!Z7:%  
  void SaveBmp(); tZ^;{sM  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aA`q!s.%A  
  // Dialog Data L{f>;[FR  
  //{{AFX_DATA(CCaptureDlg) $kma#7  
  enum { IDD = IDD_CAPTURE_DIALOG }; \z9?rvT:  
  CComboBox m_Key; X{}#hyYk"  
  BOOL m_bControl; 4E>(Y98  
  BOOL m_bAlt; _,FoXf7  
  BOOL m_bShift; ~8(X@~Tn*  
  CString m_Path; nY9qYFw  
  CString m_Number; Nr9[Vz?$P  
  //}}AFX_DATA %g&,]=W\N  
  // ClassWizard generated virtual function overrides u;Eu<jU1  
  //{{AFX_VIRTUAL(CCaptureDlg) prN(V1O  
 public: U.U.\   
  virtual BOOL PreTranslateMessage(MSG* pMsg); es[5B* 5  
 protected: KeI:/2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CLEG'bZa,  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e:LZs0  
  //}}AFX_VIRTUAL $ud>Z;X=P  
  // Implementation 'w[d^L   
 protected: $`{q[{  
  HICON m_hIcon; Q!X_&ao )O  
  // Generated message map functions 51qIo4$  
  //{{AFX_MSG(CCaptureDlg) ^-GX&ODa  
  virtual BOOL OnInitDialog(); uV_)JZ W,L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i*R:WTw#  
  afx_msg void OnPaint(); |OZ>/l {  
  afx_msg HCURSOR OnQueryDragIcon(); O'-Zn]@.]  
  virtual void OnCancel(); m5w9l"U]H  
  afx_msg void OnAbout(); 9K46>_TyH  
  afx_msg void OnBrowse(); Cz r4 -#2  
  afx_msg void OnChange(); MLBg_<  
 //}}AFX_MSG kA%OF*%|6  
 DECLARE_MESSAGE_MAP() .k`*$1?73x  
}; 0DB<hpC:5  
#endif :.o=F`W  
=jIT"rk  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V`,[=u?c  
#include "stdafx.h" xd fvme[  
#include "Capture.h" X/-KkC  
#include "CaptureDlg.h" ZBR^[OXO  
#include <windowsx.h> 3>9dJx4I  
#pragma comment(lib,"hook.lib") #IaBl?}r^  
#ifdef _DEBUG $Kz\ h#}  
#define new DEBUG_NEW NB5L{Gf6-  
#undef THIS_FILE OF<n T  
static char THIS_FILE[] = __FILE__; @MZ6E$I  
#endif l~4e2xoT  
#define IDM_SHELL WM_USER+1 /;nO<X:XV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N~}v:rK>g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V\K m% vP  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;D"P9b]9$  
class CAboutDlg : public CDialog s$>m0^  
{ :+ 9Ft>  
 public: 8U2 wH  
  CAboutDlg(); y'!p>/%v  
  // Dialog Data Ot$cmBhw!  
  //{{AFX_DATA(CAboutDlg) r(1pvcWY-  
  enum { IDD = IDD_ABOUTBOX };  df4^C->:  
  //}}AFX_DATA >9tkx/J  
  // ClassWizard generated virtual function overrides >\7RIy3  
  //{{AFX_VIRTUAL(CAboutDlg) &lh_-@Xz  
 protected: |:=b9kv  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2x`xyR_Q.R  
  //}}AFX_VIRTUAL -{8Q= N  
  // Implementation im \ YL<  
 protected: a&s"# j  
  //{{AFX_MSG(CAboutDlg) QE#-A@c  
  //}}AFX_MSG DAMpR3  
  DECLARE_MESSAGE_MAP() hw ;dm  
}; 1s} ``1>  
=!S@tuY  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bOxjm`B<  
{ W_BAb+$aF  
 //{{AFX_DATA_INIT(CAboutDlg) ( #-=y~%  
 //}}AFX_DATA_INIT /[|}rqX(  
} GATP  
)| Vg/S  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dVVvG]  
{ Ife,h s  
 CDialog::DoDataExchange(pDX); XuFm4DEJ  
 //{{AFX_DATA_MAP(CAboutDlg) }U?gKlLg  
 //}}AFX_DATA_MAP p21=$?k!;  
} krr-ZiK  
mU?&\w=v$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3\p]esse  
 //{{AFX_MSG_MAP(CAboutDlg) p~, 3A:i  
 // No message handlers  zfjDb  
 //}}AFX_MSG_MAP t)oES>W1  
END_MESSAGE_MAP() (ciGLfNG  
K^,&ub.L)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) cu479VzPx:  
: CDialog(CCaptureDlg::IDD, pParent) Ql#W /x,e  
{ 1(:b{Bl  
 //{{AFX_DATA_INIT(CCaptureDlg) uD ?I>7  
  m_bControl = FALSE; p9&gEW  
  m_bAlt = FALSE; 3)C6OF>7  
  m_bShift = FALSE; nz&b5Xb2  
  m_Path = _T("c:\\"); dEQReD  
  m_Number = _T("0 picture captured."); |%:q hs,  
  nCount=0; )~?S0]j}  
  bRegistered=FALSE; [al(>Wr9  
  bTray=FALSE; 0i`v:Lq%  
 //}}AFX_DATA_INIT Y uw E 0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2pxWv )0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rY[3_NG%  
} hpqHllL  
,NaV [ "9$  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n~"g'Y  
{  EbBv}9g  
 CDialog::DoDataExchange(pDX); xS H6n  
 //{{AFX_DATA_MAP(CCaptureDlg) ,<Grd5em.  
  DDX_Control(pDX, IDC_KEY, m_Key); PUQ_w  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); f*|8n$%   
  DDX_Check(pDX, IDC_ALT, m_bAlt); ub zb  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {h vQ<7b  
  DDX_Text(pDX, IDC_PATH, m_Path); fz<|+(_>J  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EBj,pk5M  
 //}}AFX_DATA_MAP d739UhKC  
} rSF;Lp)}  
m0%iw1OsH%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /^z/]!JG:V  
//{{AFX_MSG_MAP(CCaptureDlg) w L/p.@  
 ON_WM_SYSCOMMAND() oN&rq6eN  
 ON_WM_PAINT() fXF=F,!t  
 ON_WM_QUERYDRAGICON() =A0"0D{\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @sB}q 6>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Qb6QXjN Q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) u n?j  
//}}AFX_MSG_MAP 1kvPiV=X>  
END_MESSAGE_MAP() dt-Qu},8-  
0^<Skm27"  
BOOL CCaptureDlg::OnInitDialog() ~!3t8Hx6  
{ [0%yJH  
 CDialog::OnInitDialog(); NSMjr_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @b ::6n/u  
 ASSERT(IDM_ABOUTBOX < 0xF000); OQytgXED  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Edf=?K+\!i  
 if (pSysMenu != NULL) g33<qYxP  
 { 4DQ07w  
  CString strAboutMenu; bK_0NrXP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9D{u,Q V  
  if (!strAboutMenu.IsEmpty()) l#2r.q^$|  
  { #[k~RYS3  
   pSysMenu->AppendMenu(MF_SEPARATOR); o ;[C(OS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); YiIddQ  
  } sW]yuu!/  
 } vF.?] u  
 SetIcon(m_hIcon, TRUE); // Set big icon Vr&el  
 SetIcon(m_hIcon, FALSE); // Set small icon "fX_gN?  
 m_Key.SetCurSel(0); ;_?zB NW  
 RegisterHotkey(); x"(7t3xK  
 CMenu* pMenu=GetSystemMenu(FALSE); WX%h4)z*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); mC*W2#1pF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S F&M (=w<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p<of<YU)  
 return TRUE; // return TRUE unless you set the focus to a control ]Wy^VcqX  
} [ -9)T  
V9+xL 1U#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =Q/w%8G  
{ W;3 R;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1?D8|<  
 { " jl1.Ah  
  CAboutDlg dlgAbout; {&\J)oZ  
  dlgAbout.DoModal(); @K,2mhE~h  
 } ".~Mm F  
 else 5z9r S<  
 { T!m42EvIvE  
  CDialog::OnSysCommand(nID, lParam); $\0cJCQ3  
 } jHkyF`<+  
} fap|SMGt  
9l]UE0yTL/  
void CCaptureDlg::OnPaint() v?Z'[l  
{ i>ESEmb-  
 if (IsIconic()) cOzg/~\1  
 { ]uBT &  
  CPaintDC dc(this); // device context for painting !pd7@FwC  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x><zGXvvp|  
  // Center icon in client rectangle bajC-5R1k  
  int cxIcon = GetSystemMetrics(SM_CXICON); uuI3NAi~  
  int cyIcon = GetSystemMetrics(SM_CYICON); Bl kSWW/  
  CRect rect; .K $p`WQ{  
  GetClientRect(&rect); q6;OS.f  
  int x = (rect.Width() - cxIcon + 1) / 2; KcIc'G 9  
  int y = (rect.Height() - cyIcon + 1) / 2; T5 K-gz7A  
  // Draw the icon K%Usjezv&  
  dc.DrawIcon(x, y, m_hIcon); t!6\7Vm/  
 } gzl%5`DBw  
 else ^z[_U}N\}  
 { r:fwrC  
  CDialog::OnPaint(); P\D[n-&  
 } 68v xI|EZ  
} ?~F]@2)5w  
2"T8^r|U  
HCURSOR CCaptureDlg::OnQueryDragIcon() 98D{{j92  
{ X?KGb{  
 return (HCURSOR) m_hIcon; Y h^WTysBn  
} 2B6^ ]pSk  
EG F:xl  
void CCaptureDlg::OnCancel() 9|J8]m?x  
{ kA1RfSS  
 if(bTray) NJ >I%u*  
  DeleteIcon(); tH-gaDj_  
  CDialog::OnCancel(); @Djs[Cs<*  
} vg+r?4Q3  
X tJswxw`K  
void CCaptureDlg::OnAbout() ^OHZ767v  
{ 'jh2**i 34  
 CAboutDlg dlg; Wl,%&H2S<  
 dlg.DoModal(); b2a'KczV  
}  ]a78tTi  
@; W<dJ<X  
void CCaptureDlg::OnBrowse() ?+3R^%`V  
{ 613/K`o  
 CString str; {]+ jL1  
 BROWSEINFO bi; ; qO@A1Hq  
 char name[MAX_PATH]; OZ eiH X!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8r2XGR  
 bi.hwndOwner=GetSafeHwnd(); Xyb8u})p'  
 bi.pszDisplayName=name; K3La9O)>  
 bi.lpszTitle="Select folder"; +nU',E  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Xfj)gPt}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); kBrvl^D{5  
 if(idl==NULL) `2pO5B50  
  return; jeY4yM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FL59  
 str.ReleaseBuffer(); l#b:^3  
 m_Path=str; 4+)Z k$E  
 if(str.GetAt(str.GetLength()-1)!='\\') 7 2`/d`  
  m_Path+="\\"; ymHKcQ  
 UpdateData(FALSE); bAUHUPe  
} ozVpfs  
*^n^nnCwp  
void CCaptureDlg::SaveBmp() DKR<W.!*t  
{ OdO{xG G@  
 CDC dc; {PL,VY)Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BeAk 21xb  
 CBitmap bm; SO7(K5H,  
 int Width=GetSystemMetrics(SM_CXSCREEN); C=8H)Ef,l  
 int Height=GetSystemMetrics(SM_CYSCREEN); AlUJ1^o)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]OUD5T  
 CDC tdc; Xe)Pg)J1  
 tdc.CreateCompatibleDC(&dc); r~I.F!{  
 CBitmap*pOld=tdc.SelectObject(&bm); RvWFF^,.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4 uShM0qa  
 tdc.SelectObject(pOld); #U\$@4D  
 BITMAP btm; t/A:k  
 bm.GetBitmap(&btm); ,bxz]S1W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; VcP:}a< B\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7Ez}k}aR<  
 BITMAPINFOHEADER bih; GM:, CJ?  
 bih.biBitCount=btm.bmBitsPixel; 4>l0V<  
 bih.biClrImportant=0; &/HoSj>HS  
 bih.biClrUsed=0; ;D:=XA%  
 bih.biCompression=0; )#C_mB$-#  
 bih.biHeight=btm.bmHeight; S45'j(S=  
 bih.biPlanes=1; OthG7+eF  
 bih.biSize=sizeof(BITMAPINFOHEADER); 61G|?Aax  
 bih.biSizeImage=size; -P2 @mx%  
 bih.biWidth=btm.bmWidth; {d8^@UL  
 bih.biXPelsPerMeter=0; k@7kNMl  
 bih.biYPelsPerMeter=0; !!9{U%s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .-J`d=Krp  
 static int filecount=0; S3;lKr  
 CString name; \{lE0j7}h  
 name.Format("pict%04d.bmp",filecount++); hX&-/fF+f  
 name=m_Path+name; #0(fOHPQ  
 BITMAPFILEHEADER bfh; Xp#~N_S$  
 bfh.bfReserved1=bfh.bfReserved2=0; @?m+Z"o|z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `nKJR'QC  
 bfh.bfSize=54+size; D$ej+s7  
 bfh.bfOffBits=54; OqtQA#uL  
 CFile bf; )q^(T1  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0Qt~K#mr/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R!9qQn?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3zbXAR*  
  bf.WriteHuge(lpData,size); v C^>p5F  
  bf.Close(); ATo}FL 2  
  nCount++; ci;&CHa  
 } -7&?@M,u  
 GlobalFreePtr(lpData); j+nv=p  
 if(nCount==1) (p^S~Ax  
  m_Number.Format("%d picture captured.",nCount); O 3G:0xF  
 else s~=g*99H  
  m_Number.Format("%d pictures captured.",nCount); D]jkR} t  
  UpdateData(FALSE); ZH!;z-R  
} ("b*? : B  
<M=';h^w2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?x'w~;9R/  
{ |ebvx?\  
 if(pMsg -> message == WM_KEYDOWN) *G\=i A  
 { X`D+jiQ(f  
  if(pMsg -> wParam == VK_ESCAPE) p x0Sy|  
   return TRUE; Nvhy3  
  if(pMsg -> wParam == VK_RETURN) =88t*dH(,"  
   return TRUE; 3Mur*tj#  
 } ERp{gB2U?  
 return CDialog::PreTranslateMessage(pMsg); w?*j dwh,'  
} ^zHRSO  
J,9%%S8/C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;|;iCaD a+  
{ 1b8c67j[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Jb9F=s+  
  SaveBmp(); ~+=E"9Oo  
  return FALSE; UUGe"]V^g:  
} YlrB@mE0n$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qZ&a76t  
 CMenu pop; /-><k,mL?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); q P'[&h5Y  
 CMenu*pMenu=pop.GetSubMenu(0); Rh[Ibm56  
 pMenu->SetDefaultItem(ID_EXITICON); vn``0!FX  
 CPoint pt; (m/aV  
 GetCursorPos(&pt); 4 ]sCr+   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &/iFnYVhy  
 if(id==ID_EXITICON) >2u y  
  DeleteIcon(); lf6|.  
 else if(id==ID_EXIT) XO%~6Us^  
  OnCancel(); *<UGgnmLE  
 return FALSE; _Yy:s2I8B  
} [t$4Tdd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v[smQO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VE*j*U j  
 AddIcon(); _!%M%  
 return res; *Er? C;  
} ]H>+m 9  
h mds(lv7  
void CCaptureDlg::AddIcon() SYeE) mI  
{ }f]b't  
 NOTIFYICONDATA data; \@8*TS  
 data.cbSize=sizeof(NOTIFYICONDATA); ?d~]Wd!z  
 CString tip; -w\M-wc/$  
 tip.LoadString(IDS_ICONTIP); 5tMh/]IeS  
 data.hIcon=GetIcon(0); $HxS:3D%D  
 data.hWnd=GetSafeHwnd(); JdO)YlM-  
 strcpy(data.szTip,tip); e$ 32  
 data.uCallbackMessage=IDM_SHELL; W"|mpxp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8?kP*tmcZ  
 data.uID=98; j3{HkcjJG  
 Shell_NotifyIcon(NIM_ADD,&data); mTJ"l(,3  
 ShowWindow(SW_HIDE); jFG5)t<D  
 bTray=TRUE; EavX8r  
} _F^$aZt?e  
@UV{:]f~e  
void CCaptureDlg::DeleteIcon() BKX 9 SL]  
{ xG8`'SNY  
 NOTIFYICONDATA data; 0U%Xm[:  
 data.cbSize=sizeof(NOTIFYICONDATA); *%I[ ke *  
 data.hWnd=GetSafeHwnd(); 4~Dax)  
 data.uID=98; UUH;L  
 Shell_NotifyIcon(NIM_DELETE,&data); fx]eDA|$e  
 ShowWindow(SW_SHOW); nc&Jmo7  
 SetForegroundWindow(); HA1]M`&  
 ShowWindow(SW_SHOWNORMAL); O) 1E$#~  
 bTray=FALSE; BJgDo  
} Xo8DEr  
<}]{~y  
void CCaptureDlg::OnChange() C38%H  
{ /K@$#x_{  
 RegisterHotkey(); .yX>.>"T|  
} eG4>d^`c  
rFfy#e  
BOOL CCaptureDlg::RegisterHotkey() D'n L  
{ ?&xlT+JM  
 UpdateData(); K#wK1 Sv  
 UCHAR mask=0; 5j`v`[B;  
 UCHAR key=0; Yg&` U^7]B  
 if(m_bControl) z&>|*C.Y  
  mask|=4; ULIFSd Y  
 if(m_bAlt) :/i~y$t  
  mask|=2; @mNJ=mEV  
 if(m_bShift) Z7KXWu+6`m  
  mask|=1; .jargvAL*  
  key=Key_Table[m_Key.GetCurSel()]; {>h97}P  
 if(bRegistered){ R*\~k%Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); r :NH6tAL  
  bRegistered=FALSE; ABZ06S/  
 } 4w;~4#ZPp  
 cMask=mask; lLMPw}r<  
 cKey=key; lJ&y&N<O  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nP;;MX:B  
 return bRegistered; !k-` eJ|  
} 5 VKcV&D  
A0>x9XSkJ  
  四、小结 > H~6NBd5D  
. ,R4WA,  
  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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