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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: n:/!{.  
  v/rBjUc+X  
  一、实现方法 \L~^c1s3r  
$ MH;v_'a  
  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: s)]T"87H'_  
x cAs}y}  
#pragma data_seg("shareddata") 7AT8QC`u  
HHOOK hHook =NULL; //钩子句柄 qK d ="PR}  
UINT nHookCount =0; //挂接的程序数目 .G\](%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4sQm"XgE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5wx~QV=Hh  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 57{T p:|  
static int KeyCount =0; "Ux(nt  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U?f-/@fc  
#pragma data_seg() )2ShoFF  
<#?dPDMG.*  
  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。 r/AOgS  
[>a3` 0M  
  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: PbZ%[F  
0*5Jq#5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR NN'pBU R  
cKey,UCHAR cMask) qCcLd7`$  
{ ddKP3}  
 BOOL bAdded=FALSE; F<p`)?  
 for(int index=0;index<MAX_KEY;index++){ "A+7G5  
  if(hCallWnd[index]==0){ |}:}14ty  
   hCallWnd[index]=hWnd; mm +V*L{x  
   HotKey[index]=cKey; "i#g [x  
   HotKeyMask[index]=cMask; jXf@JxQ  
   bAdded=TRUE; K1J |\!o  
   KeyCount++; IKP_%R8.  
   break; ])F+ C/Px1  
  } .lb]Xa*n  
 } sS ?A<D  
 return bAdded; =Mwuhk|*  
} f?/OV*  
//删除热键 #2U#h-vI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {f`Y\_r$@  
{ }WFI /W'  
 BOOL bRemoved=FALSE; hzM;{g>t  
 for(int index=0;index<MAX_KEY;index++){ 2qE_SSXn  
  if(hCallWnd[index]==hWnd){ O DN_i  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Yz0fOX  
    hCallWnd[index]=NULL; !J;Bm,Xn6  
    HotKey[index]=0; ck0%H#BYY  
    HotKeyMask[index]=0; D1-/#QN$1  
    bRemoved=TRUE; TPBQfp%HU  
    KeyCount--; J i@q7qkC  
    break; ?:`sE"  
   } ps2j]g  
  } bR"4:b>K  
 } :]F66dh+  
 return bRemoved; a_}C*+D  
} \K\eq>@6  
R7(XDX=[ s  
&PV%=/ -J  
  DLL中的钩子函数如下:  N#9N ^#1  
a+lNXlh=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %$zak@3%'  
{ ;5X~"#%U_  
 BOOL bProcessed=FALSE; AFL'Ox]0  
 if(HC_ACTION==nCode) t^MTR6y+8  
 { p%*s3E1.D  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 &AxtSIpucP  
   switch(wParam) W"@'}y  
   {  "ADI .  
    case VK_MENU:  tM\BO0  
     MaskBits&=~ALTBIT; w?u3e+  
     break; 7WSP0Xyz  
    case VK_CONTROL: xF3FY0U[  
     MaskBits&=~CTRLBIT; H%l-@::+$  
     break; iNkN'("  
    case VK_SHIFT: zMpvS rc  
     MaskBits&=~SHIFTBIT; _XP}f x7$C  
     break; CB>W# P%  
    default: //judge the key and send message X(E`cH |  
     break; [[T6X9  
   } Kh=\YN\E<  
   for(int index=0;index<MAX_KEY;index++){ c0e[vrP:  
    if(hCallWnd[index]==NULL) |) ~-Wy  
     continue; z0\ $# r^I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9C?SEbC  
    { e^@ZN9qQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V/\Y(Mxc  
     bProcessed=TRUE; $ s1/Rmw  
    } '")'h  
   } uHacu<$=  
  } yy/'B:g  
  else if((lParam&0xc000ffff)==1){ //有键按下 0OG 3#pE  
   switch(wParam) 40 u tmC  
   { V[%IU'{:  
    case VK_MENU: o8:9Y js  
     MaskBits|=ALTBIT; ))dqC l  
     break; E71H=C 4  
    case VK_CONTROL: *wx%jbJo  
     MaskBits|=CTRLBIT; /,~]1&?}1  
     break; aUa+]H[  
    case VK_SHIFT: QPp31o.!5  
     MaskBits|=SHIFTBIT; sF :pwI5^  
     break; UzSDXhzObf  
    default: //judge the key and send message =os!^{p7>  
     break; @b 17jmq{  
   } J3oUtu  
   for(int index=0;index<MAX_KEY;index++){ o@ ^^;30  
    if(hCallWnd[index]==NULL) EGv]K|  
     continue; 9i_@3OVl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IY!.j5q8  
    { 5IzCQqOPgX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mPPB"uQ  
     bProcessed=TRUE; PmsZ=FY  
    } 1xkk5\3]  
   } 9+ve0P7$  
  } Sa)L=5Nr  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sng6U;Z  
   for(int index=0;index<MAX_KEY;index++){ IAb.Z+ig  
    if(hCallWnd[index]==NULL) c"CR_  
     continue; i,RbIZnJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JY:Fu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sT iFh"8d>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vP'!&}  
   } s^)(.e_  
  }  %>zG;4  
 } &l`_D?{<#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :ba4E[@  
} AGwdM-$iT  
2XUIC^<@s  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: lxD~l#)^ln  
_E0yzkS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2C"i2/NH'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]CU)#X<J  
[zP}G?(  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: LoJEchRK  
"tmu23xQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .;bU["fn)  
{ b/T k$&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) pXQ$n:e  
 { (yEU9R$I"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 71<4q {n  
  SaveBmp(); tmoclK-  
  return FALSE; ?a, `{1m0\  
 } ?)Gb=   
 …… //其它处理及默认处理 %qrUP\rn  
} GX.a!XQ@!  
n sN n>{  
nC$ c.K'  
  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。 =(c.8d  
-~~R?,H'Z_  
  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。 U CFw+  
$_a/!)bP  
  二、编程步骤 8ce'G" b  
\:JY[s/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; "K|':3n|  
Bbb":c6w0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :$X dR:f}}  
K`|V1L.m  
  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; \\oa[nvL~  
_S &6XNV  
  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; F5UHkv"K&O  
[ f<g?w  
  5、 添加代码,编译运行程序。 4w 7vgB  
.",BLuce  
三、程序代码 b?M. 0{"H  
D iHj!tZN  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^h`rA"F\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Hp(41Eb,  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :q2RgZE  
#if _MSC_VER > 1000 :.-KM7tDI1  
#pragma once L&5zr_  
#endif // _MSC_VER > 1000 m+pK,D~{"  
#ifndef __AFXWIN_H__ WdJeh:h  
#error include 'stdafx.h' before including this file for PCH ?WS.RBe2  
#endif 3c`  
#include "resource.h" // main symbols mxc^IRj  
class CHookApp : public CWinApp Z0V6cikW6  
{ 54s90  
 public: 6l"4F6  
  CHookApp(); @'J~(#}  
  // Overrides tg%Sn+:  
  // ClassWizard generated virtual function overrides O15~\8#'  
  //{{AFX_VIRTUAL(CHookApp) &MONg=s3  
 public: p .~5k  
  virtual BOOL InitInstance(); `Y '-2Fv  
  virtual int ExitInstance();  $iH  
  //}}AFX_VIRTUAL 4;IZ}9|G  
  //{{AFX_MSG(CHookApp) >;xkiO>Y  
  // NOTE - the ClassWizard will add and remove member functions here. !0X"^VB  
  // DO NOT EDIT what you see in these blocks of generated code ! K_X(j$2Xc  
  //}}AFX_MSG jfa<32`0E  
  DECLARE_MESSAGE_MAP() 94rx4"AN8;  
}; N45@)s!F9j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uE#i3( J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8rz ,MsFR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f[OJ qk  
BOOL InitHotkey(); FT gt$I  
BOOL UnInit();  )Z:maz  
#endif MLDAr dvK  
Zc9S[ivq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. eQ#"-i  
#include "stdafx.h" LXc;`]  
#include "hook.h" _UF'Cf+Y  
#include <windowsx.h> kRiZ6mn  
#ifdef _DEBUG $yFR{_]  
#define new DEBUG_NEW Ojp|/yd^YL  
#undef THIS_FILE iA"H*0  
static char THIS_FILE[] = __FILE__; /'>ck2drjk  
#endif U}-hV@y  
#define MAX_KEY 100 eoiC.$~\  
#define CTRLBIT 0x04 /cD]m  
#define ALTBIT 0x02 w*4sT+ P  
#define SHIFTBIT 0x01 sR$/z9w  
#pragma data_seg("shareddata") aU] nh. a  
HHOOK hHook =NULL; c 8|&Q  
UINT nHookCount =0; 0gKSjTqo  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~Z97L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT R"71)ob4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vrsOA@ee3H  
static int KeyCount =0; pD6a+B\;k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '&y+,2?;Y[  
#pragma data_seg() Y;sN UX  
HINSTANCE hins; ,fs>+]UY3  
void VerifyWindow(); \mwxV!!b$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  !h* F58  
//{{AFX_MSG_MAP(CHookApp) wA%,_s/U  
// NOTE - the ClassWizard will add and remove mapping macros here. dM5N1$1,  
// DO NOT EDIT what you see in these blocks of generated code! QnH~' k  
//}}AFX_MSG_MAP I9cZZ`vs  
END_MESSAGE_MAP() ~0{F,R.$  
vqwSOh|P9  
CHookApp::CHookApp() G4f%=Z  
{ `]l[p+DO  
 // TODO: add construction code here, {/qq*0wa  
 // Place all significant initialization in InitInstance 9q<?xO  
} pH.&OW%  
I}/-zyx>=  
CHookApp theApp; "Ze<dB#,Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [PU0!W;  
{ !~f!O"n)3r  
 BOOL bProcessed=FALSE; #_fL[j&  
 if(HC_ACTION==nCode) ,09d"7`X  
 { =Wl}Pgo!  
  if((lParam&0xc0000000)==0xc0000000){// Key up +dK;\wT  
   switch(wParam) U\tujK1  
   { )u5+<OG}=  
    case VK_MENU: p GSS   
     MaskBits&=~ALTBIT; B#x.4~YX  
     break; @RI\CqFHR  
    case VK_CONTROL: RD'i(szi?  
     MaskBits&=~CTRLBIT; O8w|!$Q.  
     break; G9a6 $K)b  
    case VK_SHIFT: {rZ )!  
     MaskBits&=~SHIFTBIT; JXF@b-c  
     break; Q>>II|~;J  
    default: //judge the key and send message l=t$ XWh!  
     break; q{oppali  
   } \MFjb IL  
   for(int index=0;index<MAX_KEY;index++){ 1mz72K  
    if(hCallWnd[index]==NULL) By}>h6`[  
     continue; BjCg!6`XF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <bgFc[Z  
    { 6 VuMx7W1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  $"x~p1P  
     bProcessed=TRUE; .uu[MzMIu  
    } XSz)$9~hk  
   } ~i/K7qZ  
  } .Zv uhOn^  
  else if((lParam&0xc000ffff)==1){ //Key down G^/8lIj  
   switch(wParam) dgM@|&9*m  
   { 4z>SI\Ss  
    case VK_MENU: <;nhb  
     MaskBits|=ALTBIT; [&a=vE  
     break; YhNO{4D  
    case VK_CONTROL: /%w3(e  
     MaskBits|=CTRLBIT; GbN|!,X1m  
     break; YB'BAX<lI  
    case VK_SHIFT: xnD"LK  
     MaskBits|=SHIFTBIT; M[7$cfp-Y~  
     break; ,fW%Qv  
    default: //judge the key and send message C{8(ew  
     break; z1 P=P%F  
   } 2io~pk>  
   for(int index=0;index<MAX_KEY;index++) MF/@Efjn ]  
   { tEHgQto  
    if(hCallWnd[index]==NULL) ae|j#!~oi  
     continue; K/ 5U;oC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1=Nh<FuQ  
    { ct![eWsuB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~zT743  
     bProcessed=TRUE; R\d)kcy4  
    } sW]fPa(cn,  
   } aJ^RY5  
  } ]KE"|}B  
  if(!bProcessed){ B(h%>mT[  
   for(int index=0;index<MAX_KEY;index++){ TdWatvY5p  
    if(hCallWnd[index]==NULL) .7|Iausv  
     continue; %uy5la  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 24Uvi:B?~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $I }k>F  
   } .DG`~Fpk  
  } R /0zB  
 } p]erk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /Mmts=^Ja  
} GP{$w_'!J0  
!ZrU@T  
BOOL InitHotkey() %UokR"  
{ Uon^z?0A  
 if(hHook!=NULL){ @K=C`N_22  
  nHookCount++; f )Ef-o  
  return TRUE; 3P2x%Gp  
 } "1HKD  
 else j9^V)\6)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _-5|"oJ  
  if(hHook!=NULL) ,zVS}!jRhy  
   nHookCount++; Z b}U 4  
  return (hHook!=NULL); P}8cSX9  
} $QB/n63  
BOOL UnInit() 2D)B%nM[  
{ L-eO_tTh0  
 if(nHookCount>1){ 5u=>~yK+  
  nHookCount--; yB2}[1  
  return TRUE; ( we)0AxF'  
 } 7 tQ?av  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i# bcjH  
 if(unhooked==TRUE){ #sM`>KG6T1  
  nHookCount=0; [PX%p ;"D  
  hHook=NULL; _Nacqa  
 } A"i $.dR{  
 return unhooked; s a{x.2/o}  
} >["X( %&w  
2$TwD*[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8h,=yAn5  
{ .s-*aoj  
 BOOL bAdded=FALSE; w:aV2  
 for(int index=0;index<MAX_KEY;index++){ 7_ s7 );  
  if(hCallWnd[index]==0){ \=uD)9 V  
   hCallWnd[index]=hWnd; 08G${@D+X0  
   HotKey[index]=cKey; U(/8dCyyY  
   HotKeyMask[index]=cMask; V@o#" gZ  
   bAdded=TRUE; {5 Sy=Y  
   KeyCount++; fUq:`#Q  
   break; J_7#UjGA,  
  } g&I|@$\  
 } ; ,n}>iTE  
 return bAdded; =z!/:M  
} unc8WXW  
L<k(stx~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RA1K$D ?A  
{ nxMZd=Y  
 BOOL bRemoved=FALSE; BU.O[?@64  
 for(int index=0;index<MAX_KEY;index++){ IoZ _zz0  
  if(hCallWnd[index]==hWnd){ bF'Jm*f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DT3"uJTt  
    hCallWnd[index]=NULL; ~,7Tj  
    HotKey[index]=0; ?7uK:'8  
    HotKeyMask[index]=0; x %W%  
    bRemoved=TRUE; X`28?  
    KeyCount--; Yk0/f|>O  
    break; +CN!3(r  
   } ~9Qd83`UH  
  } .iYp9?t  
 } W. BX6  
 return bRemoved; ? =G{2E.  
} 'x6rU"e$J  
wOg#J  
void VerifyWindow() '| p"HbJ  
{ L~Y^O`c  
 for(int i=0;i<MAX_KEY;i++){ RTr"#[  
  if(hCallWnd!=NULL){ I]a [Ngj  
   if(!IsWindow(hCallWnd)){ f7/M_sx  
    hCallWnd=NULL; OlP1Zd/l  
    HotKey=0; q $PO. #  
    HotKeyMask=0; _+,>NJ  
    KeyCount--; i0F6eqe=J  
   } Qs ysy  
  } j'`-3<k  
 } KW!+Ws  
} gx8i|]  
m- bu{  
BOOL CHookApp::InitInstance() }W0_eQ  
{ NMS+'GRW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); YC(X= D  
 hins=AfxGetInstanceHandle(); wxJoWbn  
 InitHotkey(); kB.CeG]tk  
 return CWinApp::InitInstance(); 2!R+5^Iy  
} PD~vq^@Q  
s|I$c;>  
int CHookApp::ExitInstance() CEAmb[h  
{ vNju|=Lo  
 VerifyWindow(); 9_O6Sl  
 UnInit(); |w{C!Q8l  
 return CWinApp::ExitInstance(); CB#B!;I8v  
} 3$S~!fh  
7AlL,&+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6F5g2hBz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) WIabQ_fX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Tp|>(~;ai  
#if _MSC_VER > 1000 Y]7 6y>|e  
#pragma once bFSs{\zE  
#endif // _MSC_VER > 1000 Ym.{ {^=  
{eVv%sbq  
class CCaptureDlg : public CDialog `O5427Im  
{ v#EFklOP  
 // Construction [8Fn0A  
 public: ?aI. Z+#  
  BOOL bTray; M:dH>  
  BOOL bRegistered; !f]kTs]j~  
  BOOL RegisterHotkey(); &8I }q]'k  
  UCHAR cKey; SLRF\mh!L  
  UCHAR cMask; +cM~|  
  void DeleteIcon(); %C rTO(  
  void AddIcon(); BwrX.!M  
  UINT nCount; n5z|@I`S_  
  void SaveBmp(); \_YDSmjy  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor wbvOf X  
  // Dialog Data ksTK'7*  
  //{{AFX_DATA(CCaptureDlg) 4)8e0L*[B?  
  enum { IDD = IDD_CAPTURE_DIALOG }; HYL['B?Wid  
  CComboBox m_Key; 0Y:)$h2?  
  BOOL m_bControl; 2x<!>B  
  BOOL m_bAlt; z{&z  
  BOOL m_bShift; =k>fW7e  
  CString m_Path; A!Tm[oqu  
  CString m_Number; 3 NFo=Z8  
  //}}AFX_DATA _z J /z  
  // ClassWizard generated virtual function overrides OL%}C*Zq  
  //{{AFX_VIRTUAL(CCaptureDlg) r*dNta<  
 public: P)#h4|xZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); W 1u!&:O  
 protected: 3y,2RernK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {3.n!7+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (#Xs\IEVF  
  //}}AFX_VIRTUAL Zd88+GS,#  
  // Implementation |sY  
 protected: *[m:4\  
  HICON m_hIcon; t{QQ;'  
  // Generated message map functions *l;S"}b*,_  
  //{{AFX_MSG(CCaptureDlg) I~^Xw7  
  virtual BOOL OnInitDialog(); $VB dd~f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); EeT 69o  
  afx_msg void OnPaint(); 3fA+{Y8S  
  afx_msg HCURSOR OnQueryDragIcon(); 8};kNW^2m  
  virtual void OnCancel(); i]J.WFu  
  afx_msg void OnAbout(); i7Cuc+ j8  
  afx_msg void OnBrowse(); _C (fz CK  
  afx_msg void OnChange(); {}rnn$HQe  
 //}}AFX_MSG 5Zd oem  
 DECLARE_MESSAGE_MAP() {M7`"+~w  
}; .6LRg  
#endif D9NQ3[R 9  
5gII|8>rQ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mRm}7p  
#include "stdafx.h" 0kNKt(_  
#include "Capture.h" D4C:%D  
#include "CaptureDlg.h" 7qZC+x6_L  
#include <windowsx.h> Sc#3<nVg  
#pragma comment(lib,"hook.lib") @}:E{J#g  
#ifdef _DEBUG r>7 +&s*yk  
#define new DEBUG_NEW Aj=GekX{  
#undef THIS_FILE 1KbZ6Msy  
static char THIS_FILE[] = __FILE__; %P M#gnt@  
#endif 9#m3<oSJ  
#define IDM_SHELL WM_USER+1 KO%$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W$2 \GPJt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2K{'F1"RM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _x1W\#  
class CAboutDlg : public CDialog /CMgWGI  
{ 09 trFj$L  
 public: 7(uz*~Z?`0  
  CAboutDlg(); dP +wcl4  
  // Dialog Data Shn=Q  
  //{{AFX_DATA(CAboutDlg) vz>9jw:Y  
  enum { IDD = IDD_ABOUTBOX }; a!/\:4-uc  
  //}}AFX_DATA X 6tJ  
  // ClassWizard generated virtual function overrides ;6D3>Lm  
  //{{AFX_VIRTUAL(CAboutDlg) p5tb=Zg_  
 protected: (QL:7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :o8|P  
  //}}AFX_VIRTUAL 4hLk+z<n  
  // Implementation @/ |g|4  
 protected: <#4""FO*  
  //{{AFX_MSG(CAboutDlg) -CuuO=h  
  //}}AFX_MSG hczDu8  
  DECLARE_MESSAGE_MAP() P+ CdqOL  
}; Maq`Or|4  
L+p}%!g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Q{?\qCrrYl  
{ dNNXMQ0"  
 //{{AFX_DATA_INIT(CAboutDlg) m;\nMdn  
 //}}AFX_DATA_INIT F'OO{nF  
} t-o,iaPG3  
/3Gq&[R{  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ZO cpF1y  
{ ej@4jpHQN  
 CDialog::DoDataExchange(pDX); U5TkgHN{y  
 //{{AFX_DATA_MAP(CAboutDlg) tpEy-"D&  
 //}}AFX_DATA_MAP wpt$bqs|1  
} (]T[n={Y  
w8R7Ksn(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gd]S;<Jh  
 //{{AFX_MSG_MAP(CAboutDlg) HcJ!(  
 // No message handlers )W>$_QxbN  
 //}}AFX_MSG_MAP T#i;=NP"  
END_MESSAGE_MAP() x {Utf$|  
 nOd;Zw  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H"(#Tp ZTE  
: CDialog(CCaptureDlg::IDD, pParent) O8b#'f~  
{ cW_wIy\]&  
 //{{AFX_DATA_INIT(CCaptureDlg) f S/:OnH  
  m_bControl = FALSE; M>Tg$^lm  
  m_bAlt = FALSE; }2LWDQ;po  
  m_bShift = FALSE; % &&)[  
  m_Path = _T("c:\\"); D (8Z90  
  m_Number = _T("0 picture captured."); UkpTK8>&  
  nCount=0; *]NfT}}  
  bRegistered=FALSE; "_\"S  
  bTray=FALSE; 6vAZLNG3  
 //}}AFX_DATA_INIT X/cb1#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BJb,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &V$cwB  
} =pi,]m  
NfPWcK [  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) MD;Z UAX<  
{ fh3uo\`@  
 CDialog::DoDataExchange(pDX); XPqGv=CN  
 //{{AFX_DATA_MAP(CCaptureDlg) =v?P7;T  
  DDX_Control(pDX, IDC_KEY, m_Key); R&;x_4dr^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GiX3c^V"1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); MGMJeq vr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {*F =&D  
  DDX_Text(pDX, IDC_PATH, m_Path); 9x!kvB6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); YW6a?f^!  
 //}}AFX_DATA_MAP )1B? <4  
} aaCRZKr  
\V!{z;.fA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8.. |-<w  
//{{AFX_MSG_MAP(CCaptureDlg) J^yqu{  
 ON_WM_SYSCOMMAND() X,aRL6>r  
 ON_WM_PAINT() 6`Y:f[VB  
 ON_WM_QUERYDRAGICON() }Vob)r{R@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HVoP J!K3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4)D~S4{E5  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  K];]  
//}}AFX_MSG_MAP F"k`PF*b  
END_MESSAGE_MAP()  B>:U  
i6k6l%  
BOOL CCaptureDlg::OnInitDialog() 2^ ]^Yc  
{ CN ( :  
 CDialog::OnInitDialog(); XXn3K BIf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xtD(tiqh.;  
 ASSERT(IDM_ABOUTBOX < 0xF000); T=u"y;&L  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p*42 @1,  
 if (pSysMenu != NULL) ,(Zxd4?y  
 { ; 8DtnnE  
  CString strAboutMenu; BRM `/s  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {g1"{  
  if (!strAboutMenu.IsEmpty()) Ul /m]b6-  
  { \1joW#  
   pSysMenu->AppendMenu(MF_SEPARATOR); u8KQV7E  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Dt[+HCCY:  
  } -.? @f tY  
 } b<4nljbx  
 SetIcon(m_hIcon, TRUE); // Set big icon !`H{jwH  
 SetIcon(m_hIcon, FALSE); // Set small icon /"st sF  
 m_Key.SetCurSel(0); jQm~F` z  
 RegisterHotkey(); NYP3u_ QX  
 CMenu* pMenu=GetSystemMenu(FALSE); ~Yg) 8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +@!\3a4!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fXWE4^jU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); BWxJ1ENM  
 return TRUE; // return TRUE unless you set the focus to a control "1^tVw|  
} y*X.DS 1(w  
6>#8 ^{[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Zl&ED{k<  
{ \ [OB.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J5Zz*'av'  
 { %G 2g @2  
  CAboutDlg dlgAbout; W`vPf  
  dlgAbout.DoModal(); ysG1{NOl  
 } :Bt,.uN C  
 else W[DoQ @q  
 { 1aS:bFi`  
  CDialog::OnSysCommand(nID, lParam); $dKfUlO  
 } ww7nQ}H5(  
} rQ_cH  
z(Uz<*h8  
void CCaptureDlg::OnPaint() xS%&l)dT  
{ IoJI|lP  
 if (IsIconic()) .wq j  
 { (nmsw6 X  
  CPaintDC dc(this); // device context for painting go yDG/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QOUyD;0IW  
  // Center icon in client rectangle !2HF|x$  
  int cxIcon = GetSystemMetrics(SM_CXICON); M0lJyz J  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0_ST2I"Ln  
  CRect rect; \.iejB  
  GetClientRect(&rect); p<'pqf  
  int x = (rect.Width() - cxIcon + 1) / 2; k"gm;,`  
  int y = (rect.Height() - cyIcon + 1) / 2; qzvht4  
  // Draw the icon QeFt WjlqC  
  dc.DrawIcon(x, y, m_hIcon); FO[ s;dmzu  
 } qonStIP  
 else uwI"V|g%a&  
 { $rk=#;6]v;  
  CDialog::OnPaint(); !ck~4~J  
 } :TP4f ?FA  
} +{=U!}3|  
$eT[`r  
HCURSOR CCaptureDlg::OnQueryDragIcon() ./3/3& 6  
{ HxW/t7Z(  
 return (HCURSOR) m_hIcon; {ixKc  
} 6(7{|iY  
Q~ Ad{yC  
void CCaptureDlg::OnCancel() z.RM85?T  
{ -a>CF^tH  
 if(bTray) LNR1YC1c  
  DeleteIcon(); k)D5>T  
  CDialog::OnCancel(); `a[fC9  
} ,Nw2cv}D  
&E0^Jz  
void CCaptureDlg::OnAbout() +RM!j9Rq  
{ MHt ~ZVH  
 CAboutDlg dlg; $v2t6wS,"  
 dlg.DoModal(); r ^*D8  
} /^jl||'H,:  
:oW 16m1`  
void CCaptureDlg::OnBrowse() XSN=0N!GB  
{ P8h|2,c%  
 CString str; JBHPI@Qt%  
 BROWSEINFO bi; @>$qb|j  
 char name[MAX_PATH]; O86p]Lr  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `?[,1   
 bi.hwndOwner=GetSafeHwnd(); q'y< UyT6  
 bi.pszDisplayName=name; J9tV|0  
 bi.lpszTitle="Select folder"; K/Y"oQ2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ( 1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 'J0I$-QYk  
 if(idl==NULL) W+8s>  
  return; r7V !M1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -{Ar5) ?='  
 str.ReleaseBuffer(); 2{BS `f  
 m_Path=str; )sK53O$  
 if(str.GetAt(str.GetLength()-1)!='\\') s{7bu|0  
  m_Path+="\\"; P"}"q ![  
 UpdateData(FALSE); ep},~tPZn  
} V8WSJ=-&  
Z*b l J5YC  
void CCaptureDlg::SaveBmp() B>cT <B  
{ Nc[N 11?O  
 CDC dc; t OJyj49^a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %ueD3;V  
 CBitmap bm; }.8yKj^p  
 int Width=GetSystemMetrics(SM_CXSCREEN); \i-CTv6f  
 int Height=GetSystemMetrics(SM_CYSCREEN); -CFy   
 bm.CreateCompatibleBitmap(&dc,Width,Height); ; }T+ImjA  
 CDC tdc; 9dAtQwGR"6  
 tdc.CreateCompatibleDC(&dc); `S-%}eUv  
 CBitmap*pOld=tdc.SelectObject(&bm); CGK]i. N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4,R"(ej  
 tdc.SelectObject(pOld); "WtYqXyd  
 BITMAP btm; ^jRX6  
 bm.GetBitmap(&btm); ` s+kYWg'Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \5j}6Wj  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0:I<TJ~P  
 BITMAPINFOHEADER bih; #ucb  
 bih.biBitCount=btm.bmBitsPixel; jy>?+hm?  
 bih.biClrImportant=0; 8b-mW>xsA  
 bih.biClrUsed=0; }:$ot18  
 bih.biCompression=0; NySa%7@CD  
 bih.biHeight=btm.bmHeight; -w"lW7  
 bih.biPlanes=1; :r "G Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;-"q;&1e  
 bih.biSizeImage=size; [lSQMoi3  
 bih.biWidth=btm.bmWidth; O x`K7$)  
 bih.biXPelsPerMeter=0; Sa@'?ApH  
 bih.biYPelsPerMeter=0; j+ L:Ao  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {' 0#<Z  
 static int filecount=0; ?VRsgV'$  
 CString name; ]2|fc5G'  
 name.Format("pict%04d.bmp",filecount++); 4e|N^h*!  
 name=m_Path+name; {SXSQ'=  
 BITMAPFILEHEADER bfh; ^\`a-l^  
 bfh.bfReserved1=bfh.bfReserved2=0; b3 =Z~iLv  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [MbbL  
 bfh.bfSize=54+size; +kE~OdZG  
 bfh.bfOffBits=54; aqQ+A:g  
 CFile bf; 8* #$ 3e  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Bv jsl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Eld[z{n"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o6~JAvw  
  bf.WriteHuge(lpData,size); \Z42EnJ  
  bf.Close(); `s UY$Q  
  nCount++; HIE8@Rv/3  
 } }><[6Uz%  
 GlobalFreePtr(lpData); 9MI9$s2y  
 if(nCount==1) 3X DU(#  
  m_Number.Format("%d picture captured.",nCount); }hg2}g99  
 else W4k$m 2  
  m_Number.Format("%d pictures captured.",nCount); s>\^dtG7  
  UpdateData(FALSE); ^"=G=* /  
} *ej< 0I{  
/~;!Ew|q  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kkb+qo  
{ J}8p}8eF,  
 if(pMsg -> message == WM_KEYDOWN) W|zPV`  
 { o_k)x3I?  
  if(pMsg -> wParam == VK_ESCAPE) r1vS~ 4Z  
   return TRUE; |nLq 4.  
  if(pMsg -> wParam == VK_RETURN) p"jze3mF  
   return TRUE; r7?nHF  
 } o37oRv]  
 return CDialog::PreTranslateMessage(pMsg); Pn.DeoHme  
} u=]*,,5<  
yk5K8D[tV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f##/-NG  
{ H%rNQxA2 +  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5|pF*8*  
  SaveBmp();  #$2/<  
  return FALSE; T2azHo7  
} LA 2/<:  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1t^9.!$@y  
 CMenu pop; 4J(-~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "sDs[Lcq  
 CMenu*pMenu=pop.GetSubMenu(0); SVd@- '-K  
 pMenu->SetDefaultItem(ID_EXITICON); >35w"a7S  
 CPoint pt; _$D!"z7i  
 GetCursorPos(&pt); h. ftl2>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }KIS_krs  
 if(id==ID_EXITICON) ,tyPZR_  
  DeleteIcon(); VEI ct{  
 else if(id==ID_EXIT) &s?uMWR  
  OnCancel(); 5}]+|d;  
 return FALSE; [ @"6:tTU  
} .%.7~Nu,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); SVn@q|N  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tH *|  
 AddIcon(); #wRhR>6  
 return res; _TsN%)m  
} 1t?OD_d!8  
#<e D  
void CCaptureDlg::AddIcon() 1>L'F8"  
{ `0M6<e]C  
 NOTIFYICONDATA data; G![4K#~NM  
 data.cbSize=sizeof(NOTIFYICONDATA); ~a`  xI  
 CString tip; CX\XaM)l  
 tip.LoadString(IDS_ICONTIP);  ^QJJ2jZ  
 data.hIcon=GetIcon(0); VzHrKI  
 data.hWnd=GetSafeHwnd(); H6j t[  
 strcpy(data.szTip,tip); x lqP%  
 data.uCallbackMessage=IDM_SHELL; o'(BL:8s  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6g" h}p\{S  
 data.uID=98; Ng W"wh  
 Shell_NotifyIcon(NIM_ADD,&data); ty[p5%L1  
 ShowWindow(SW_HIDE); MOCcp s*  
 bTray=TRUE; 0wV9Trp  
} HKT, 5  
%3#C0%{x  
void CCaptureDlg::DeleteIcon() "Z,T%]  
{ l,l6j";ohd  
 NOTIFYICONDATA data; H7;, Kr  
 data.cbSize=sizeof(NOTIFYICONDATA); Y2.zT6i  
 data.hWnd=GetSafeHwnd(); eXK3W2XF  
 data.uID=98; .f-=gZ* *  
 Shell_NotifyIcon(NIM_DELETE,&data); eh]sye KBj  
 ShowWindow(SW_SHOW); N_iy4W(NU  
 SetForegroundWindow(); 5<v1v&  
 ShowWindow(SW_SHOWNORMAL); ^5TVm>F@3  
 bTray=FALSE; q jc4IW t~  
} ;l @lA)i  
ivq(eKy  
void CCaptureDlg::OnChange() 6z6\xkr  
{ pXN'vP  
 RegisterHotkey(); ?H@<8Ra=3  
} s9nPxC&A  
p!uB8F  
BOOL CCaptureDlg::RegisterHotkey() {R@V  
{ Lkx~>U   
 UpdateData(); )&>W/56/  
 UCHAR mask=0; YMK ![ q-  
 UCHAR key=0; (Ll'j0]k>  
 if(m_bControl)  @,k5T51m  
  mask|=4; b$#b+G{y  
 if(m_bAlt) we^' R}d  
  mask|=2; +BL46 Bq  
 if(m_bShift) X"_ ^^d-  
  mask|=1; "zd_eC5  
  key=Key_Table[m_Key.GetCurSel()];   P3|s}&  
 if(bRegistered){ h ka_Fo  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); a <?~1pWtc  
  bRegistered=FALSE; vFntzN>#  
 } a oU"  
 cMask=mask; ^4"AWps  
 cKey=key; Q]N&^ E  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =|IlORf<  
 return bRegistered; [{u3g4`}  
} w@cW`PlF  
v]F4o1ckk  
  四、小结 t4v'X}7q]  
Q#SQ@oUzD  
  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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