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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: .fn \]rUv  
  \|n- O=}=2  
  一、实现方法 QpF;:YX^3  
AL[KpY  
  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: Tg7an&#  
FX;QG94!  
#pragma data_seg("shareddata") k}S :RK  
HHOOK hHook =NULL; //钩子句柄 goLL;AL  
UINT nHookCount =0; //挂接的程序数目 3_C|z,\:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pXtl 6K%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^Xz@`_I  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?#Ge.D~u  
static int KeyCount =0; c|f<u{'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l\f*d6o  
#pragma data_seg() J; S (>c  
C2.HMgL  
  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。 .7O*pJ2(H  
0q^>ZF-@  
  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: x!hh"x  
_PPy44r2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 2"COP>  
cKey,UCHAR cMask) MO[2~`,Q!  
{ q~rEq%tk  
 BOOL bAdded=FALSE; ]yV!  
 for(int index=0;index<MAX_KEY;index++){ Jf@H/luW  
  if(hCallWnd[index]==0){ HsxVZ.dS  
   hCallWnd[index]=hWnd; GmK^}=frj  
   HotKey[index]=cKey; +|*IZ:w)  
   HotKeyMask[index]=cMask; <:_wbVn-  
   bAdded=TRUE; 1kz\IQ{  
   KeyCount++; ] ;KJ6  
   break; i)\ L:qF5  
  } m.hkbet/R  
 } -6Z\qxKqZ  
 return bAdded; $5 >e  
} },uF 4M.K  
//删除热键 +20G>y=+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RXNn[A4xfY  
{ fAF1"4f  
 BOOL bRemoved=FALSE; S2E8G q9  
 for(int index=0;index<MAX_KEY;index++){ GeI-\F7b  
  if(hCallWnd[index]==hWnd){ Cwr~HY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^0Zf,40  
    hCallWnd[index]=NULL; N1}c9}  
    HotKey[index]=0; MlcR"gl*  
    HotKeyMask[index]=0; {vs uPY  
    bRemoved=TRUE; |U~<3.:m:  
    KeyCount--; lVd^ ^T*fh  
    break; 84$nT>c  
   } ?xA:@:l/  
  } XFg 9P}"  
 } Y21g{$~Q{  
 return bRemoved; `Nv=B1  
} [2>yYr s_=  
U] ~$g}!)  
3s5z UT;  
  DLL中的钩子函数如下: RPwbTAl}  
C,wL0Yj[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0;hqIJcE:\  
{ >f^r^P  
 BOOL bProcessed=FALSE; Y1L[;)Hn  
 if(HC_ACTION==nCode) Uq[>_"}  
 { uyO/55;HO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f0A{W/0n  
   switch(wParam) 'SO %)B  
   {  !NIhx109q  
    case VK_MENU: LuNc, n%  
     MaskBits&=~ALTBIT; E{`kaWmC&~  
     break; i 6R~`0>Q  
    case VK_CONTROL: vN Vox0V  
     MaskBits&=~CTRLBIT; ?fiIwF)  
     break; =MSr/O2  
    case VK_SHIFT: z-BXd  
     MaskBits&=~SHIFTBIT; \j+1V1t9  
     break; iMAfJ-oN  
    default: //judge the key and send message )5rb&M}  
     break; 6 uv#de  
   } bNm#tmSt  
   for(int index=0;index<MAX_KEY;index++){ ICpAt~3[M  
    if(hCallWnd[index]==NULL) jGJLSEe_  
     continue; .I$qCb|FP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kd>hhiz|  
    { j1^I+j)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1!ii;s^e  
     bProcessed=TRUE; R"4Vtww  
    } 1=r#d-\tR  
   } 4Fa~Aog  
  } "C }b%aO:  
  else if((lParam&0xc000ffff)==1){ //有键按下 Hek*R?M|  
   switch(wParam) 0[A[U_b  
   { t=rEt>n~L  
    case VK_MENU: j-0z5|*KE  
     MaskBits|=ALTBIT; $}RJ,%~'x  
     break; t 4PK}>QW  
    case VK_CONTROL: <S\jpB  
     MaskBits|=CTRLBIT; g~Z vA(`  
     break; Q8C_9r/:N>  
    case VK_SHIFT: gRrL[z  
     MaskBits|=SHIFTBIT; nv GF2(;l  
     break; T,7Y7c/3V  
    default: //judge the key and send message _?<|{O  
     break; ;>#wU'  
   } yGI;ye'U  
   for(int index=0;index<MAX_KEY;index++){ 4Z1ST;  
    if(hCallWnd[index]==NULL) _|iSF2f,X  
     continue; MPCBT!o4Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M:XSQ["6>V  
    { U [*FCD!~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qT ,Te  
     bProcessed=TRUE; fg s!v7  
    } 5"^en# ?9  
   } : imW\@u  
  } ?QsQnQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 'GB. UKlR  
   for(int index=0;index<MAX_KEY;index++){ YbR!+ 0\g  
    if(hCallWnd[index]==NULL) |P[w==AAf  
     continue; 0x'#_G65y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZNJ@F<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %+f>2U4I  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >,TUZ  
   } V:qSy#e  
  } ,3?Q(=j  
 } S\4tzz @  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B&\IGWG(  
} FR$:"  
OPwtV9%  
  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: .}^g!jm~h  
ao%NK<Lt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L\Aq6q@c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9`wZz~hL"  
JX -' mV`  
  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: R?68*} `7  
BZ:H`M`n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -- PtZ]Z  
{ A$<.a'&T!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @AG n{q  
 { X59: C3c  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0":ib0=  
  SaveBmp(); T29Dt  
  return FALSE; YX=a#%vrl  
 } @Gk ILFN  
 …… //其它处理及默认处理 ? K ;dp  
} sA/pVU  
%oq{L]C(rf  
+Fuqch jq  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 M%Ji0v38  
GYJ80k|  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 *194{ ep  
@<&5J7fb  
  二、编程步骤 j2ve^F:Q  
~T9/#-e>BF  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; QFw  +cy  
* vflscgt  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _I:~@  
e^d0zl{  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Ai:BEPKe  
{/"2Vk<H8  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; qLw{?sH}J/  
#i@;J]x(  
  5、 添加代码,编译运行程序。 gGr^@=;YC  
|k+8<\  
三、程序代码 ?,p;O  
+,2:g}5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL plUZ"Tr  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) M\sN@+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]+(6,ct&.  
#if _MSC_VER > 1000 3x5JFM  
#pragma once [baiH|5>  
#endif // _MSC_VER > 1000 !+1<E*NQ S  
#ifndef __AFXWIN_H__ uZc`jNc\  
#error include 'stdafx.h' before including this file for PCH .l>77zM6  
#endif #z&& M"*a|  
#include "resource.h" // main symbols X*M#FT-  
class CHookApp : public CWinApp |kw)KEi}H  
{ M*z~gOZ  
 public: U@gn;@\  
  CHookApp(); d\p,2  
  // Overrides ;gBRCZ  
  // ClassWizard generated virtual function overrides 0*rQ3Z  
  //{{AFX_VIRTUAL(CHookApp) N03HQp)g  
 public: 2r!s*b\Ix  
  virtual BOOL InitInstance(); Zw*v  
  virtual int ExitInstance(); )^ m%i]L _  
  //}}AFX_VIRTUAL aa?w:3  
  //{{AFX_MSG(CHookApp) ,$+lFv3LE  
  // NOTE - the ClassWizard will add and remove member functions here. c\iA89msp  
  // DO NOT EDIT what you see in these blocks of generated code ! =; ^%(%Y{m  
  //}}AFX_MSG gXYI\.  
  DECLARE_MESSAGE_MAP() T.@aep\"  
}; WX=Jl<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); '$|[R98  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 33#0J$j7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &{>cZh}\  
BOOL InitHotkey(); ~p1j`r;  
BOOL UnInit(); ]%|GmtqZs,  
#endif #bMuvaP~  
|UK}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K<pV  
#include "stdafx.h" hCCiD9gz  
#include "hook.h" }2(,K[?  
#include <windowsx.h> JQV%fTHS  
#ifdef _DEBUG LA@w:Fg  
#define new DEBUG_NEW "]z-: \ V  
#undef THIS_FILE <%maDM^_\(  
static char THIS_FILE[] = __FILE__; 1abtgDL  
#endif fJ/e(t  
#define MAX_KEY 100 Q,p}:e  
#define CTRLBIT 0x04 SF&BbjBE0  
#define ALTBIT 0x02 *"D3E7AO  
#define SHIFTBIT 0x01 5"HV BfFk  
#pragma data_seg("shareddata") ?*E'^~,H)  
HHOOK hHook =NULL; t"k*PA  
UINT nHookCount =0; - M[$Zy^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey G]fRk^~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 29!q!g|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ? %`@ub$  
static int KeyCount =0; w S4.8iJ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RT)d]u  
#pragma data_seg() <z]cyXv/  
HINSTANCE hins; J13>i7]L%  
void VerifyWindow(); hJDi7P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) :Qumb  
//{{AFX_MSG_MAP(CHookApp) >iD )eB  
// NOTE - the ClassWizard will add and remove mapping macros here. pV20oSJNt  
// DO NOT EDIT what you see in these blocks of generated code! T'4z=Z]w  
//}}AFX_MSG_MAP *8#i$w11M  
END_MESSAGE_MAP() %1O;fQL  
p$h4u_  
CHookApp::CHookApp() _h X]%  
{ ;cPy1  
 // TODO: add construction code here, >)spqu]  
 // Place all significant initialization in InitInstance AI,(z;{P  
} Sg6"WV{<  
et,f_fd7v  
CHookApp theApp; ]T;EdK-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P5 K' p5}#  
{ *tgnYa[l  
 BOOL bProcessed=FALSE; | \'rP_I>  
 if(HC_ACTION==nCode) 2'_:S@  
 { Z$0 uH*h  
  if((lParam&0xc0000000)==0xc0000000){// Key up gA:5M  
   switch(wParam) ZHGC6a!a  
   { )=AHf?hn  
    case VK_MENU: b!sRk@LGZ  
     MaskBits&=~ALTBIT; :lB=L r)  
     break; 4F{)i  
    case VK_CONTROL: fcNL$U&-,i  
     MaskBits&=~CTRLBIT; .2>p3|F  
     break; >p.O0G gg  
    case VK_SHIFT: uoHNn7W  
     MaskBits&=~SHIFTBIT; %,D<O,N  
     break; &jsVw)Ue  
    default: //judge the key and send message 7PANtCFb&  
     break; 4g : >[q  
   } 5e$~)fL  
   for(int index=0;index<MAX_KEY;index++){ F8;dKyT?q  
    if(hCallWnd[index]==NULL) dl ~%MWAVb  
     continue; ?gJy3@D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6`]$qSTS  
    { A8pIs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D9FJ 1~  
     bProcessed=TRUE; vgUb{D  
    } Bx/L<J@  
   } `e(vH`VZ  
  } Xlb0/T<g!  
  else if((lParam&0xc000ffff)==1){ //Key down .Fnwm}  
   switch(wParam) UEozAY  
   { 9G+V;0Q  
    case VK_MENU: H&]gOs3So  
     MaskBits|=ALTBIT; M@?xa/E64  
     break; p;W.lcO`0  
    case VK_CONTROL: Td G!&:>  
     MaskBits|=CTRLBIT; /c2w/+ _  
     break; d4nH_?  
    case VK_SHIFT: L ]w/P|  
     MaskBits|=SHIFTBIT; GDD '[;  
     break; .h9l7 nZt  
    default: //judge the key and send message ")V130<  
     break; b|+wc6   
   } 2Z3('?\z~  
   for(int index=0;index<MAX_KEY;index++) i K12 pw  
   { Q5FM8Q  
    if(hCallWnd[index]==NULL) 'UMXq~RMe  
     continue; wg0 \_@3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rMUT_^  
    { xf b]b2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4dhvFGlW  
     bProcessed=TRUE; `67[O4$<  
    } z}{afEb  
   } x-?{E  
  } I =1+h  
  if(!bProcessed){ tUgEeh6  
   for(int index=0;index<MAX_KEY;index++){ PSPmO'C+  
    if(hCallWnd[index]==NULL) '3<fsK=  
     continue; 8Goh4T H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v>Mnl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NcP.;u;`  
   } -.T&(&>^  
  } S-YM%8A[  
 } KyzFnVH3)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C-Ht(x|  
} TOoQZTI  
$d,0=Ci  
BOOL InitHotkey() )=-0M9e.{  
{ (sQr X{~  
 if(hHook!=NULL){ bzvh%RsW  
  nHookCount++; ?gwUwOV"  
  return TRUE; mWyqG*-Hb  
 } cZ<A0  
 else /__PSK  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8X I?  
  if(hHook!=NULL) O)Y?=G)  
   nHookCount++; r)i>06Hd  
  return (hHook!=NULL); <a[Yk 2  
} 4[BG#  
BOOL UnInit() ?_ dIIQ  
{ J@OB`2?Zv  
 if(nHookCount>1){ uio@r^Xz  
  nHookCount--; Q6XRsFc  
  return TRUE; o}<4*qlI  
 } ]r-C1bKD`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); EaWS. eK  
 if(unhooked==TRUE){ ;A'":vXmc  
  nHookCount=0; >y}M.Mm  
  hHook=NULL; sg8/#_S1i  
 } JICawj:I  
 return unhooked; F {B\kq8  
}  ru`U'  
E7Ulnvd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $ -c!W!H  
{ A"aV'~>  
 BOOL bAdded=FALSE; M gC:b-&5_  
 for(int index=0;index<MAX_KEY;index++){ m] W5+  
  if(hCallWnd[index]==0){ .)+h H y  
   hCallWnd[index]=hWnd; qiZO _=0  
   HotKey[index]=cKey; 5"/J^"!h  
   HotKeyMask[index]=cMask; 0[F:'_  
   bAdded=TRUE; ZbT/$\0(6  
   KeyCount++; +`sv91c  
   break; .^bft P\  
  } vm'5s]kdh  
 } >I<r)w]  
 return bAdded; U;n*j3wT  
} U#n#7G6fRp  
@VN&t:/l  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O8] 'o*<]  
{ 2Sq_Tw3^  
 BOOL bRemoved=FALSE; J>^\oAgpE  
 for(int index=0;index<MAX_KEY;index++){ |e a~'N1  
  if(hCallWnd[index]==hWnd){ &vovA} F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2S8P}$mM  
    hCallWnd[index]=NULL; >3gi yeJ  
    HotKey[index]=0; UA~RK2k?  
    HotKeyMask[index]=0; CAT.4GM  
    bRemoved=TRUE; Jd,)a#<j  
    KeyCount--; ?k[p<Uo  
    break; __@zTSVb  
   } j$da8] !  
  } K\^ 0_F K  
 } $^ 'aCU0C  
 return bRemoved; aS}1Q?cU  
} ?4CNkk=v  
D^U: ih  
void VerifyWindow() d/74{.  
{ 0lM{l?  
 for(int i=0;i<MAX_KEY;i++){ }<jb vCeK  
  if(hCallWnd!=NULL){ Zs2-u^3&  
   if(!IsWindow(hCallWnd)){ rC_*sx r^  
    hCallWnd=NULL; l$*=<tV  
    HotKey=0; >\<*4J$PZ  
    HotKeyMask=0; QMo}W{D  
    KeyCount--; Z.i{i^/#(  
   } _)$PKOzbb  
  } r$wZt  
 } ~e@>zoM'^  
} MYe HS   
v=I|O%  
BOOL CHookApp::InitInstance() /q\_&@  
{ .r+hERcB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wyxGe<1  
 hins=AfxGetInstanceHandle(); Dbx~n#nG  
 InitHotkey(); l]2r)!Q7  
 return CWinApp::InitInstance(); iF+RnWX\  
} =wi*Nd7L  
*oI*-C  
int CHookApp::ExitInstance() P ,eH5w"  
{ 3UUGblg`~  
 VerifyWindow(); L3(^{W]|  
 UnInit(); c:M$m3Cs?  
 return CWinApp::ExitInstance(); 02JL*  
} vOI[Z0Lq9h  
ps:f=6m2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P`1EPF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _DPOyR2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  PWgDFL?  
#if _MSC_VER > 1000 ;%q39U}  
#pragma once J?:[$C5  
#endif // _MSC_VER > 1000 YJ7V`N p  
~H@+D}J?  
class CCaptureDlg : public CDialog VU!w!GN]Y  
{ CidM(  
 // Construction QYE7p\  
 public: zz$q5[n  
  BOOL bTray; T*q"N?/4  
  BOOL bRegistered; nX%AeDBAT  
  BOOL RegisterHotkey(); FJM;X-UOY  
  UCHAR cKey; ,WTTJN  
  UCHAR cMask; X.|Ygx  
  void DeleteIcon(); (hZ:X)E>  
  void AddIcon(); <ZPZk'53<f  
  UINT nCount; cHvF*A  
  void SaveBmp(); =LH}YUmd  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m24v@?*  
  // Dialog Data &,W$-[  
  //{{AFX_DATA(CCaptureDlg) ij)Cm]4(2  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2 g`[u|  
  CComboBox m_Key; }B!cv{{  
  BOOL m_bControl; p%RUHN3G[  
  BOOL m_bAlt; hFb fNB3  
  BOOL m_bShift; jqoPLbxT  
  CString m_Path; 4Z%Y"PL(K  
  CString m_Number; .;Y x*]  
  //}}AFX_DATA j]> uZalr  
  // ClassWizard generated virtual function overrides t3F?>G#y  
  //{{AFX_VIRTUAL(CCaptureDlg) 6&!l'[hU  
 public: P1d,8~;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); LDX*<(  
 protected: LcUlc)YH5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support el@XK}<dr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?n*fy  
  //}}AFX_VIRTUAL m6so]xr  
  // Implementation h(:<(o@<  
 protected: p{H0dj^|  
  HICON m_hIcon; wc[c N+p  
  // Generated message map functions Qb@eK$wo}  
  //{{AFX_MSG(CCaptureDlg) |zMqJ.qu  
  virtual BOOL OnInitDialog(); KS! iL=i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PNmF}"  
  afx_msg void OnPaint(); m`9^.>]P  
  afx_msg HCURSOR OnQueryDragIcon(); eY3=|RR  
  virtual void OnCancel(); <d! 6[,W;  
  afx_msg void OnAbout(); <9 },M  
  afx_msg void OnBrowse(); !GNXt4D  
  afx_msg void OnChange(); )5i* /I\  
 //}}AFX_MSG  ~^7  
 DECLARE_MESSAGE_MAP() Kw*~W i  
}; Ld~4nc$H8  
#endif Y UZKle  
`(T!>QVW+g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .nPL2zO  
#include "stdafx.h" 2lJZw@  
#include "Capture.h" Qg{WMlyOP  
#include "CaptureDlg.h" +/Z0  
#include <windowsx.h> W^|J/Y48  
#pragma comment(lib,"hook.lib") /fC\K_<N  
#ifdef _DEBUG ] j1 vbk  
#define new DEBUG_NEW mrReast  
#undef THIS_FILE 1w) fu  
static char THIS_FILE[] = __FILE__; 7uA\&/ ,  
#endif '{W3j^m7  
#define IDM_SHELL WM_USER+1 p  .aE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 9yz~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #rq?f  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H CuK  
class CAboutDlg : public CDialog @dl<-  
{ QP<FCmt8  
 public: 6.UKB<sV  
  CAboutDlg(); 1::LN(`<  
  // Dialog Data ] EV`dIk  
  //{{AFX_DATA(CAboutDlg) ~RCg.&[ou  
  enum { IDD = IDD_ABOUTBOX }; M0 L-u  
  //}}AFX_DATA [^Q&suy  
  // ClassWizard generated virtual function overrides .CvFE~  
  //{{AFX_VIRTUAL(CAboutDlg) +|M{I= 8  
 protected: 8LeK wb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $BaK'7=3*  
  //}}AFX_VIRTUAL PMsC*U,oe  
  // Implementation _4Ii5CNNU  
 protected: ~Q_F~0y  
  //{{AFX_MSG(CAboutDlg) T&!ZD2I  
  //}}AFX_MSG M.t@@wq  
  DECLARE_MESSAGE_MAP() z2ds8-z  
}; pbFYiu+  
lf;~5/%wMG  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) b<8q 92F  
{ >0 7shNX  
 //{{AFX_DATA_INIT(CAboutDlg) >waN;&>/  
 //}}AFX_DATA_INIT k5g@myb-  
} =_uol8v  
?|)rv  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gDMAc/V`l  
{ 6g8M7<og9R  
 CDialog::DoDataExchange(pDX); K^8@'#S  
 //{{AFX_DATA_MAP(CAboutDlg) mUiOD$rO  
 //}}AFX_DATA_MAP 8Y7 @D$=w  
} srhFEmgN7)  
6G$/NW=L  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t+jIHo  
 //{{AFX_MSG_MAP(CAboutDlg) hO%Y{Gg  
 // No message handlers we }#Ru*  
 //}}AFX_MSG_MAP )'=V!H#U*  
END_MESSAGE_MAP() _J` |<}?t;  
> Z]P]e  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e7h\(`J0lj  
: CDialog(CCaptureDlg::IDD, pParent) H a90  
{ TdNsyr}JG  
 //{{AFX_DATA_INIT(CCaptureDlg) \N6<BS  
  m_bControl = FALSE; 1x8(I&i  
  m_bAlt = FALSE; U>bP}[&S  
  m_bShift = FALSE; <Ak:8&$O  
  m_Path = _T("c:\\"); 6(,ItMbI  
  m_Number = _T("0 picture captured."); iY}QgB< M  
  nCount=0; |^>u<E5  
  bRegistered=FALSE; IC\E,m  
  bTray=FALSE; V;P1nL4L  
 //}}AFX_DATA_INIT hJ<:-u+yk}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R !jhwY$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c 3}x)aQ  
} cgzy0$8dj\  
L,O>6~9:^1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]X/O IfdWe  
{ ,!jR:nApE  
 CDialog::DoDataExchange(pDX); <` #,AVH  
 //{{AFX_DATA_MAP(CCaptureDlg) MPqY?KF  
  DDX_Control(pDX, IDC_KEY, m_Key); m9%yR"g9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  {`tHJ|8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); H&w(]PDh  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8 f|9W%jt  
  DDX_Text(pDX, IDC_PATH, m_Path); G,+xT}@wu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +}&pVe\t  
 //}}AFX_DATA_MAP t;h+Cf4  
} gQu\[e%mVo  
eB)UXOu1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o`oRG)QC  
//{{AFX_MSG_MAP(CCaptureDlg) 3D{82*&  
 ON_WM_SYSCOMMAND() XSD"/_xD  
 ON_WM_PAINT() Fp wlV}:  
 ON_WM_QUERYDRAGICON() [SKP|`I>I  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $_ST:h&C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "vv$%^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) |:~("rA+v  
//}}AFX_MSG_MAP 6-D%)Z(  
END_MESSAGE_MAP() yjeqv-7  
e!TG< (S  
BOOL CCaptureDlg::OnInitDialog() =ltbSf7  
{ TXA. 6e  
 CDialog::OnInitDialog(); <{3q{VW*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7Ntjx(b$"h  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0 =3FO}[u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T^rz!k{  
 if (pSysMenu != NULL) ['Hp?Q|k  
 { Ej-=y2j{g  
  CString strAboutMenu; ;JMOsn}8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $_4oN(WSz  
  if (!strAboutMenu.IsEmpty()) jI@bTS o  
  { U/}AiCdj@  
   pSysMenu->AppendMenu(MF_SEPARATOR); l=Vowx.$2f  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); nC-c8y  
  } AaJ,=eQ  
 } @SX%? mk8G  
 SetIcon(m_hIcon, TRUE); // Set big icon iuvtj]/  
 SetIcon(m_hIcon, FALSE); // Set small icon WiPM <'  
 m_Key.SetCurSel(0); ;}UIj{sj*  
 RegisterHotkey(); v'mJ~tz  
 CMenu* pMenu=GetSystemMenu(FALSE); V#n?&-{V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3Yn:fsy  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7vB9K_wCI  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ctnAVm  
 return TRUE; // return TRUE unless you set the focus to a control \c5#\1<  
} 'p4da2%  
BaNU}@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &!3VqHQ`  
{ `kaR@t  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a!s.850@  
 { ' lQ  
  CAboutDlg dlgAbout; 3j[w -Lfp  
  dlgAbout.DoModal(); e<ism?WG  
 } (h'$3~  
 else [wXwKr  
 { /6Jy'"+'0  
  CDialog::OnSysCommand(nID, lParam); ]%vGC^  
 } t-?KKU8  
} uIVTs9\  
*!wO:< -  
void CCaptureDlg::OnPaint() N]O{T_5-0  
{ GN~[xXJU  
 if (IsIconic())  0jip::x  
 { Q"l"p:n%n  
  CPaintDC dc(this); // device context for painting &r 5&6p  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /)eNx  
  // Center icon in client rectangle B.CH9M  
  int cxIcon = GetSystemMetrics(SM_CXICON); YUP%K!k  
  int cyIcon = GetSystemMetrics(SM_CYICON); i-Ge *?  
  CRect rect; FVvv   
  GetClientRect(&rect); 'p|Iwtjn>  
  int x = (rect.Width() - cxIcon + 1) / 2; oF 1W}DtA  
  int y = (rect.Height() - cyIcon + 1) / 2; rU2YMghE  
  // Draw the icon R &1mo  
  dc.DrawIcon(x, y, m_hIcon); [~Z'xY y  
 } $Hl+iF4j<  
 else 2Be?5+  
 { JsWq._O{/  
  CDialog::OnPaint(); W>t&N  
 } 1DI"LIL  
} R9|2&pfm(M  
T9U2j-lA?  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6x (L&>F  
{ buxI-wv  
 return (HCURSOR) m_hIcon; {m*V/tX  
} :!Y?j{sGU  
!?us[f=g%  
void CCaptureDlg::OnCancel() oZ\qT0*eb  
{ pJ)+}vascR  
 if(bTray) ]Lb?#S  
  DeleteIcon(); iA^+/Lt  
  CDialog::OnCancel(); f2SU5e2  
} +UpMMh q  
7am/X.  
void CCaptureDlg::OnAbout() >TQBRA;'  
{ GP7) m  
 CAboutDlg dlg; 6iV"Tl{z-  
 dlg.DoModal(); HqnKpZ  
} F`ZIc7(.{  
'%]@a7w  
void CCaptureDlg::OnBrowse() Aa\=7  
{ \+evZ{Pu  
 CString str; KWn1%oGJ  
 BROWSEINFO bi; ou,=MpXx*  
 char name[MAX_PATH]; 8y 4D9_{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -'p@ lk  
 bi.hwndOwner=GetSafeHwnd(); GJ^]ER-K  
 bi.pszDisplayName=name; hB GGs  
 bi.lpszTitle="Select folder"; 9Qs"X7iH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yV+ E;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); PhI6dB`  
 if(idl==NULL) *3etxnQc  
  return; _ c(C;s3o  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); N|Cy!E=d  
 str.ReleaseBuffer(); #@\NdW\  
 m_Path=str; *|,ykb>  
 if(str.GetAt(str.GetLength()-1)!='\\') w;SH>Ax:  
  m_Path+="\\"; |q.:hWYFpM  
 UpdateData(FALSE); (Q+:N;  
} BHJ'[{U*w  
0@FM^ejA#  
void CCaptureDlg::SaveBmp() e ka@?`  
{ :?:j$ =nWN  
 CDC dc; ,O&PLr8cJ?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eE.5zXU3R  
 CBitmap bm; KZ<RDXVT  
 int Width=GetSystemMetrics(SM_CXSCREEN); )T};Q:  
 int Height=GetSystemMetrics(SM_CYSCREEN); cLyuCaH>c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f;tyoN0wHx  
 CDC tdc; mTuB*  
 tdc.CreateCompatibleDC(&dc); E][{RTs  
 CBitmap*pOld=tdc.SelectObject(&bm); &6^W% r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }fZ =T4r  
 tdc.SelectObject(pOld); y'2kV6TtqD  
 BITMAP btm; g<T`F  
 bm.GetBitmap(&btm); ?#EXG  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; J"2ODB5"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )D@n?qbG  
 BITMAPINFOHEADER bih; `F+x]<m!  
 bih.biBitCount=btm.bmBitsPixel; *A1TDc$  
 bih.biClrImportant=0; }jY[| >z  
 bih.biClrUsed=0; cVHE}0Xd(  
 bih.biCompression=0; r(in]7  
 bih.biHeight=btm.bmHeight; n-b<vEZw#  
 bih.biPlanes=1; P7k$^n  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4wj|  
 bih.biSizeImage=size; hp z*jyh8  
 bih.biWidth=btm.bmWidth; ^3)2]>pW  
 bih.biXPelsPerMeter=0; (~pEro]?+)  
 bih.biYPelsPerMeter=0; ~~:8Yv[(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~h^}W$pO  
 static int filecount=0; })0 7u  
 CString name; JJHvj=9'o  
 name.Format("pict%04d.bmp",filecount++); E#2k|TpH4  
 name=m_Path+name; v.2Vg  
 BITMAPFILEHEADER bfh; ]z q_gV8k  
 bfh.bfReserved1=bfh.bfReserved2=0; g\{! 21M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ?6YUb;  
 bfh.bfSize=54+size; 'iISbOM  
 bfh.bfOffBits=54; j]l}K*8(  
 CFile bf; FeeWZe0i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )< a8a@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G* ~*2>~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Is6']bYh  
  bf.WriteHuge(lpData,size); ^'I5]cRa  
  bf.Close(); >eTgP._  
  nCount++; oJJ k  
 } 2SPFjpG8n  
 GlobalFreePtr(lpData); =O'%)Y&  
 if(nCount==1) ]|La MMD  
  m_Number.Format("%d picture captured.",nCount); w$;*~Qc  
 else r=H\4%P4  
  m_Number.Format("%d pictures captured.",nCount); 2au(8IWu  
  UpdateData(FALSE); m3xj5]#^$  
} Fx99"3`3  
n25tr'=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) JX0_UU  
{ 9"lW"lG!  
 if(pMsg -> message == WM_KEYDOWN) i[\u-TF  
 { = 4WZr  
  if(pMsg -> wParam == VK_ESCAPE) k mr 4cU5  
   return TRUE; No&[ \;  
  if(pMsg -> wParam == VK_RETURN) ApJf4D<V  
   return TRUE; xOyL2   
 } P5xmLefng  
 return CDialog::PreTranslateMessage(pMsg); 3pv1L~ ZI  
} L8tLW09  
^RAFmM#F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .QQI~p0:  
{ EbYH?hPo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O#5( U. E  
  SaveBmp(); 1LIV/l^}f  
  return FALSE; ftH%, /,  
} z(X6%p0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ j"sO<Q{6%  
 CMenu pop; qq_,"~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \ J:T]  
 CMenu*pMenu=pop.GetSubMenu(0); *=9#tYn~  
 pMenu->SetDefaultItem(ID_EXITICON); GXlg%  
 CPoint pt; MV d 3*  
 GetCursorPos(&pt); :@Dos'0Px  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'I>#0VRr  
 if(id==ID_EXITICON) [_hhC  
  DeleteIcon(); `DllW{l  
 else if(id==ID_EXIT) ~tuFjj^  
  OnCancel(); Z:$b)+2:\  
 return FALSE; _O,ZeES  
} Jv.R?1;8i  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y/6LMAI  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |B$\3,  
 AddIcon(); A y[L{!)2{  
 return res; bCe-0!Q  
} T`ZJ=gv  
VX[!Vh  
void CCaptureDlg::AddIcon() X@q1;J  
{ Lbp6I0&n  
 NOTIFYICONDATA data; k[)@I;m  
 data.cbSize=sizeof(NOTIFYICONDATA); E(LE*J  
 CString tip; Vot+gCZ  
 tip.LoadString(IDS_ICONTIP); %ys}Q!gR  
 data.hIcon=GetIcon(0); @5G7bY7Nz  
 data.hWnd=GetSafeHwnd(); Iw7r}G  
 strcpy(data.szTip,tip); I8;[DP9  
 data.uCallbackMessage=IDM_SHELL; F/>Pv q]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^tcBxDC"]  
 data.uID=98; X )s7_  
 Shell_NotifyIcon(NIM_ADD,&data); *Y0,d`  
 ShowWindow(SW_HIDE); H^:|`T|,  
 bTray=TRUE; T5_Cu9>ax  
} RAbq_^Q  
%<|KJb4?  
void CCaptureDlg::DeleteIcon() m e{SVG{  
{ HWOH8q{f!  
 NOTIFYICONDATA data; Z?' |9FM  
 data.cbSize=sizeof(NOTIFYICONDATA); ea>\.D-S  
 data.hWnd=GetSafeHwnd(); B&N&eRAE  
 data.uID=98; Z`c{LYP,y"  
 Shell_NotifyIcon(NIM_DELETE,&data); v nC&1  
 ShowWindow(SW_SHOW); !z 5d+ M  
 SetForegroundWindow(); wu&7#![,  
 ShowWindow(SW_SHOWNORMAL); *v/*_6f*  
 bTray=FALSE; l8Qi^<i/  
} Y<fXuj|&  
qJt gnk|  
void CCaptureDlg::OnChange() ZUW>{'[K  
{ #'h CohL  
 RegisterHotkey(); }?kO<)d  
} q:sR zX  
Vp{2Z9]}  
BOOL CCaptureDlg::RegisterHotkey() " <a|Q,!  
{ s2=X>,kz?  
 UpdateData(); S9oGf  
 UCHAR mask=0; ]X|G+[Ujv  
 UCHAR key=0; "]Td^Nxi  
 if(m_bControl) K({,]<l5  
  mask|=4; $Xc<K_Z  
 if(m_bAlt) ITlkw~'G  
  mask|=2; YH9] T,  
 if(m_bShift) }8#Czo jt  
  mask|=1; gj X1b2  
  key=Key_Table[m_Key.GetCurSel()]; 5K~6`  
 if(bRegistered){ Ib2pV2`h(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |R/50axI  
  bRegistered=FALSE; %([H*sLX  
 } UdJV;T'rm  
 cMask=mask; 8:fiO|~%  
 cKey=key; $7d"9s\$"  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /z:K#  
 return bRegistered; kq0m^`  
} %WN2 xCSf  
!;Nh7vG  
  四、小结 7*"LW  
F| Q#KwN  
  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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