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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:  4I7}  
  &g R+D  
  一、实现方法 B1>aR 7dsf  
G(F }o]  
  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: 2xvTijO0  
rvZXK<@#+  
#pragma data_seg("shareddata") WpE\N0Yg  
HHOOK hHook =NULL; //钩子句柄 yTWP1  
UINT nHookCount =0; //挂接的程序数目 K'.aQ&2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T+7O+X#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 oJJ2y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey GGcN aW'  
static int KeyCount =0; X TpYf  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 VSa\X~  
#pragma data_seg() W'x/Kg,w-  
]6NpHDip1  
  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。 4(>|f_$  
e[f}Lxln  
  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: :,03)[u{8  
HV@ C@wmg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR LY b@0O<w  
cKey,UCHAR cMask) Pu dIb|V2  
{ XnmQp)nyV  
 BOOL bAdded=FALSE; L=4%MyZ.e  
 for(int index=0;index<MAX_KEY;index++){ Tg|0!0qD]F  
  if(hCallWnd[index]==0){ 7M*&^P\}es  
   hCallWnd[index]=hWnd; zi l^^wT0J  
   HotKey[index]=cKey; ;5qZQ8`4  
   HotKeyMask[index]=cMask; oUrNz#U  
   bAdded=TRUE; 2mj?&p?  
   KeyCount++; F)_zR  
   break; {2Jo|z  
  } 555j@  
 } NO5\|.,Z  
 return bAdded; KECo7i=e  
} z+IBy+  
//删除热键 {%W'Zx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y/57 >.3  
{ I;xrw?=\L  
 BOOL bRemoved=FALSE; g,Z8I;A^  
 for(int index=0;index<MAX_KEY;index++){ IzPnbnS}  
  if(hCallWnd[index]==hWnd){ qyzmjV6J2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d>[=]  
    hCallWnd[index]=NULL; H/"$#8-/  
    HotKey[index]=0; Q-<N)K$F(4  
    HotKeyMask[index]=0; ayR=GqZ1  
    bRemoved=TRUE; Q!7il<S  
    KeyCount--; RV^ N4q4  
    break; lezX-5Z  
   } E(]39B"i  
  } IiW*'0H:/  
 } 0;9X`z J  
 return bRemoved; )5n*4A  
} l*eJa38  
DJ)Q,l*|N9  
e$'|EE.=q+  
  DLL中的钩子函数如下: GHeucG} ?  
%l{0z<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ndW]S7  
{ 9R$0[HbI3  
 BOOL bProcessed=FALSE; =+>cTV  
 if(HC_ACTION==nCode) `^_c&y K  
 { ]J|]IP Xy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T$ w`=7  
   switch(wParam) j _]#Ew\q  
   {  T,G38  
    case VK_MENU: j >pv@D  
     MaskBits&=~ALTBIT; /:S&1'=  
     break; $)or{Z$&  
    case VK_CONTROL: 6l Suzu  
     MaskBits&=~CTRLBIT; MKiP3kt8  
     break; \tCxz(vKz  
    case VK_SHIFT: 2Q bCH}  
     MaskBits&=~SHIFTBIT; W"3YA+qpI  
     break;  (zIWJJw  
    default: //judge the key and send message {KQ]"a 6  
     break; W=-:<3XL  
   } cmcR @zv  
   for(int index=0;index<MAX_KEY;index++){ I \Luw*:  
    if(hCallWnd[index]==NULL) .I h'&  
     continue; CpGy'Ia  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "@s</HGo  
    { :<QmG3F  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a8w/#!^34  
     bProcessed=TRUE; /TEE<\"  
    } j'IZetT  
   } @1c[<3xJ T  
  } g.,_E4L  
  else if((lParam&0xc000ffff)==1){ //有键按下 q0t}  
   switch(wParam) \bXusLI!l  
   { Y'&rSHI"  
    case VK_MENU: /^M|$JRI  
     MaskBits|=ALTBIT; {e]ktj#+{  
     break; ;N(9nX}%)  
    case VK_CONTROL: 7gnrLc$]O  
     MaskBits|=CTRLBIT; U*Sjb% Qb  
     break; n[E/O}3& /  
    case VK_SHIFT: bI?uV;m>  
     MaskBits|=SHIFTBIT; HI\V29 a  
     break; ;0"p)O@s04  
    default: //judge the key and send message 'nQQqx%v  
     break; lnQfpa8j  
   } JmBe1"hs  
   for(int index=0;index<MAX_KEY;index++){ ^.g BHZ  
    if(hCallWnd[index]==NULL) :iEIo7B  
     continue; R!z32 <5k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wdMVy=SS  
    { ehTRw8"R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v$d^>+Y#  
     bProcessed=TRUE; `z1E]{A  
    } -]~KQvIH!  
   } *S= c0  
  } VRQD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 hVGK%HCz&  
   for(int index=0;index<MAX_KEY;index++){ @9AK!I8f  
    if(hCallWnd[index]==NULL) Ljs4^vy <J  
     continue; v!WkPvU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _C4N6YdU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |!6<L_31%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .~AQxsGH  
   } QLLMSa+! \  
  } H"b}lf  
 } ?#0m[k&`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '7yVvd  
} x%J.$o[<_  
[}Z!hq  
  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: jccSjGX@w  
bNh~=[E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hi0-Sw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wQw&.)T  
kE[Hq-J=N  
  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: S2PPwCU  
 %G>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :zK\t5  
{ FCIA8^}s  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N /Fa^[  
 { cM Z-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6}JW- sA  
  SaveBmp(); f7v|N)  
  return FALSE; []<N@a6VA>  
 } @!KG;d:l  
 …… //其它处理及默认处理 UZ-[vD1n  
} Wagb|B\  
/I~(*X  
$,8}3R5}  
  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。 8;<3Tyjzu  
"NvB@>S  
  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。 G_v^IM#B=  
HLb`'TC3r+  
  二、编程步骤 |_u|Td(n  
\H {UJ  
  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"; $Ma*qEB  
KYM%U" jD  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A|<i7QVY  
/#Lm)-%G  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; a_(fqoW  
^X| Bzz)  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; bZCNW$C3l  
ZRn!z`.0  
  5、 添加代码,编译运行程序。 f5P@PG]{  
9iM[3uyO  
三、程序代码 6QX2&[qWS  
z|v/h UrD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M d.^r5r  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Q=?YY-*$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \qw1\-q  
#if _MSC_VER > 1000 ,T0q.!d  
#pragma once [W Ud9fUL  
#endif // _MSC_VER > 1000 z+{Q(8'b]  
#ifndef __AFXWIN_H__ \xjI=P'-25  
#error include 'stdafx.h' before including this file for PCH _r?.%] \.  
#endif ]EfM;'j[  
#include "resource.h" // main symbols 9/dI 6P7  
class CHookApp : public CWinApp |*y'H*  
{ }~!KjFbs  
 public: k.?@qCs[  
  CHookApp(); qt=nN-AC(  
  // Overrides b0aV?A}th  
  // ClassWizard generated virtual function overrides 0I7 r{T  
  //{{AFX_VIRTUAL(CHookApp) cL^r^kL("  
 public: HImQ.y!B  
  virtual BOOL InitInstance(); rtT*2k*  
  virtual int ExitInstance(); ueLdjASJ  
  //}}AFX_VIRTUAL >vZ^D  
  //{{AFX_MSG(CHookApp) {O5(O oDa  
  // NOTE - the ClassWizard will add and remove member functions here. c;doxNd6  
  // DO NOT EDIT what you see in these blocks of generated code ! R=<uf:ca  
  //}}AFX_MSG @WTzFjv@?4  
  DECLARE_MESSAGE_MAP() @ayrI]m#>,  
}; Z ItS(o J.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); nEfQLkb[|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i _YJq;(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5uO.@0  
BOOL InitHotkey(); @%gth@8  
BOOL UnInit(); J?oEzf;M  
#endif 8Uoqj=5F  
aB2t/ua  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g;\_MbfP  
#include "stdafx.h" \!df)qdu  
#include "hook.h" H&=fD` Xq  
#include <windowsx.h> VL8yL`~zc.  
#ifdef _DEBUG *x@.$=NF"  
#define new DEBUG_NEW XpT+xv1`;  
#undef THIS_FILE eK =v<X  
static char THIS_FILE[] = __FILE__; +OfHa\Nz  
#endif #OVS]Asn}  
#define MAX_KEY 100 YjzGF=g#  
#define CTRLBIT 0x04 C~c|};&%  
#define ALTBIT 0x02 cb`ik)=K%  
#define SHIFTBIT 0x01 A9kn\U92  
#pragma data_seg("shareddata") ]z"7v  
HHOOK hHook =NULL; n|) JhXQ  
UINT nHookCount =0; p#>d1R1&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,`U'q|b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9e0t  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 63T4''bwu  
static int KeyCount =0; 0<u(!iL  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4rH:`494  
#pragma data_seg() F+285JK  
HINSTANCE hins; ?7\$zn)v#  
void VerifyWindow(); (x1 #_~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FGu#Pa  
//{{AFX_MSG_MAP(CHookApp) 3GM9ZPeN:  
// NOTE - the ClassWizard will add and remove mapping macros here. #s0Wx47~  
// DO NOT EDIT what you see in these blocks of generated code! cOb ,Md  
//}}AFX_MSG_MAP `c/mmS  
END_MESSAGE_MAP() >m4HCs>  
l]F)]>AE  
CHookApp::CHookApp() C>Cb  
{ :za:gs0  
 // TODO: add construction code here, W ,|JocDq  
 // Place all significant initialization in InitInstance ]udH`{]  
} N5Ih+8zT  
(laVmU?I7  
CHookApp theApp; P>qDQ1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Bw4 _hlm  
{ V@`A:Nc_>  
 BOOL bProcessed=FALSE; Z lR2  
 if(HC_ACTION==nCode) QRlrcauM  
 { z~\Y*\f^Y3  
  if((lParam&0xc0000000)==0xc0000000){// Key up  3;f}w g  
   switch(wParam) }J(o!2.  
   { 9y`Vg  
    case VK_MENU: IpKpj"eoLy  
     MaskBits&=~ALTBIT; Oi,:q&  
     break; +|6 u 0&R^  
    case VK_CONTROL: ]=jpqxlx  
     MaskBits&=~CTRLBIT; 0` UrB:  
     break; -"/l)1ox,  
    case VK_SHIFT: t+2,;G  
     MaskBits&=~SHIFTBIT; TRku(w1f  
     break; 2sYOO>  
    default: //judge the key and send message m 4V0e~]  
     break; U_ *K%h\m  
   } V J]S"  
   for(int index=0;index<MAX_KEY;index++){ X$9 "dL  
    if(hCallWnd[index]==NULL) C252E  
     continue; NG\^>.8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xL} ~R7  
    { 7N}==T89[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); WQ)vu&;  
     bProcessed=TRUE; qN(,8P\90  
    } +w9X$<?_  
   } BiCC72oig  
  } "t:9jU  
  else if((lParam&0xc000ffff)==1){ //Key down w6@8cNXK  
   switch(wParam) l@<yC-Xd  
   { &b!|Y  
    case VK_MENU: #*x8)6Ct  
     MaskBits|=ALTBIT; J6J|&Z~UT,  
     break; ~#nbD-*#  
    case VK_CONTROL: [FN4_  
     MaskBits|=CTRLBIT; f1 TYQ?e  
     break; MfK}DEJK,  
    case VK_SHIFT: uM74X^U  
     MaskBits|=SHIFTBIT; y5$AAas  
     break; P=PVOt@ b  
    default: //judge the key and send message JmJNq$2#c  
     break; Xi"<'E3_  
   } 5_E,x  
   for(int index=0;index<MAX_KEY;index++) K %Qj<{)  
   { C ehz]C  
    if(hCallWnd[index]==NULL) {>8u/  
     continue; pjrzoMF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3iv;4e ;  
    { lMRy6fzI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /Lt Lu  
     bProcessed=TRUE; w;8VD`>[|  
    } 3,$G?auW  
   } SVj4K \F  
  } ;1Zz-@  
  if(!bProcessed){ ~$:=hT1  
   for(int index=0;index<MAX_KEY;index++){ NkL>ru!b9  
    if(hCallWnd[index]==NULL) D?6ah=:&R  
     continue; yjB.-o('  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8>l#F<@5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C Ch38qBp  
   } MaQ`7U5 |e  
  } XX;MoE~MM  
 } (Aw!K`0Y1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q~S3d  
} 4M{]YZMw8  
fkW TO"f-  
BOOL InitHotkey() JtGBNz!"  
{ z4iZE*ZS  
 if(hHook!=NULL){ RY9h^q*  
  nHookCount++; N9jSiRJ  
  return TRUE; Q]"u?Q]  
 } h Lv_ER?  
 else ,!'L~{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  1@p'><\  
  if(hHook!=NULL) M@?,nzs K  
   nHookCount++; =!Ce#p?h,  
  return (hHook!=NULL); jo ^+  
} cBz_L"5vr[  
BOOL UnInit() Hb|y`Ok  
{ PS3%V_2  
 if(nHookCount>1){ DC6xet{  
  nHookCount--; +ZU@MOni  
  return TRUE; NP< {WL#  
 } $(JB"%S8c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -&3mOn& (1  
 if(unhooked==TRUE){ )mvD2]fK  
  nHookCount=0; |uRZT3bGyj  
  hHook=NULL; cJ#|mzup  
 } !w #x@6yq  
 return unhooked; QXg9ah~  
} wS%aN@ay3  
,oS<9kC68  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @/yJTMcf  
{  Lkl+f~m  
 BOOL bAdded=FALSE; ;&8  
 for(int index=0;index<MAX_KEY;index++){ i$b Het  
  if(hCallWnd[index]==0){ hfQx$cv6  
   hCallWnd[index]=hWnd; +kN/-UsB  
   HotKey[index]=cKey; w,qYT -R  
   HotKeyMask[index]=cMask; _(.,<R5  
   bAdded=TRUE; ~D$?.,=l  
   KeyCount++; %A ^qm  
   break; '"QN{ja  
  } U#{^29ik=o  
 } '4J];Nj0  
 return bAdded; d9>k5!  
} }jWZqIqj  
1P1"xT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~Vf+@_G8`  
{ M^twD*  
 BOOL bRemoved=FALSE; *6b$l.Vs  
 for(int index=0;index<MAX_KEY;index++){ *4<Kz{NF  
  if(hCallWnd[index]==hWnd){ 6;8Jy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z/&2Se:  
    hCallWnd[index]=NULL; Yo$NE  
    HotKey[index]=0; 8p)*;Y  
    HotKeyMask[index]=0; RHOEyXhOA  
    bRemoved=TRUE; ds9L4zfO  
    KeyCount--; +o94w^'^$b  
    break; Z F&aV?  
   } AO "pm  
  } gBZ1Weu-'  
 } RO10$1IW.2  
 return bRemoved; u_~*)w+mS@  
} },@1i<Bb  
5C^oqUZ  
void VerifyWindow() @C34^\aH+  
{ ^A"TY  
 for(int i=0;i<MAX_KEY;i++){ ci~pM<+  
  if(hCallWnd!=NULL){ 00d<V:Aoy  
   if(!IsWindow(hCallWnd)){ DL:wiQ  
    hCallWnd=NULL; B-`,h pp  
    HotKey=0; q\fZ Q  
    HotKeyMask=0; 0s#`H  
    KeyCount--; P$=BmBq18`  
   } ?%Pd:~4D  
  } lNw8eT~2  
 } Hi{1C"%  
} (E.,kcAJ  
OE4hG xG  
BOOL CHookApp::InitInstance() <,S5(pZ  
{ vg6 ' ^5S7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @TTB$  
 hins=AfxGetInstanceHandle(); TrBBV]4  
 InitHotkey(); ",hPy[k  
 return CWinApp::InitInstance(); 9ne13 qVm+  
} 37S  bF,G  
-/O_wqm#  
int CHookApp::ExitInstance() JQt Bt2  
{ s$,gM,|cK  
 VerifyWindow(); 0F495'*A  
 UnInit(); T|{1,wP  
 return CWinApp::ExitInstance(); `<z"BGQ  
} TI9]v(  
%%dQIlF  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file aU)NbESu  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ZB5:FtW4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *QIlh""6  
#if _MSC_VER > 1000 5ZXP$.  
#pragma once D[NJ{E.{  
#endif // _MSC_VER > 1000 k[`9RGT  
W8$ky[2R  
class CCaptureDlg : public CDialog v%=@_`Ht  
{ 0^L>J "o  
 // Construction :U}.  
 public: TBGN',,  
  BOOL bTray; _=wu>h&7  
  BOOL bRegistered; B`)gXqBt  
  BOOL RegisterHotkey(); I)B+h8l72<  
  UCHAR cKey; K>tubLYh  
  UCHAR cMask; "\x<Zg;  
  void DeleteIcon(); #'@pL0dj  
  void AddIcon(); 8{t^< j$n  
  UINT nCount; zree}VqD;5  
  void SaveBmp(); / X #4  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O_M2Axm  
  // Dialog Data vIL'&~C\y  
  //{{AFX_DATA(CCaptureDlg) *K<|E15 ,  
  enum { IDD = IDD_CAPTURE_DIALOG }; !m* YPY31  
  CComboBox m_Key; =Z3{6y}3p  
  BOOL m_bControl; xejQ!MAB  
  BOOL m_bAlt; R0l5"l*@+  
  BOOL m_bShift; TvbkvK  
  CString m_Path; V?.')?'V  
  CString m_Number; =41g9UQ  
  //}}AFX_DATA UcHe"mn  
  // ClassWizard generated virtual function overrides ]r^/:M  
  //{{AFX_VIRTUAL(CCaptureDlg) #}8l9[Q|M  
 public: w[5uX>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /{[Y l[{"<  
 protected: DxFmsjX[L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S^Lu RF]F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rW8.bMmM  
  //}}AFX_VIRTUAL *Va;ra(V2  
  // Implementation =Ts3O0"[  
 protected: x e~lV  
  HICON m_hIcon; *WHQ1geI8  
  // Generated message map functions x?aNK$A~X  
  //{{AFX_MSG(CCaptureDlg) n7J6YtUwP  
  virtual BOOL OnInitDialog(); eVXlQO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g?e$B}%  
  afx_msg void OnPaint(); &$1ifG   
  afx_msg HCURSOR OnQueryDragIcon(); ;yvx-  
  virtual void OnCancel(); !R;NV|.eI6  
  afx_msg void OnAbout(); Z4^O`yS9+  
  afx_msg void OnBrowse(); YT*_ vmJV  
  afx_msg void OnChange(); [eb?Fd~WB]  
 //}}AFX_MSG s#8mD !T|  
 DECLARE_MESSAGE_MAP() pdz_qj!Z  
}; 5a`f % h%  
#endif hnk,U:7}  
LXZ0up-B-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :"vW;$1 }  
#include "stdafx.h" o4%H/|Oq.  
#include "Capture.h" /e2CB"c   
#include "CaptureDlg.h"  ^n5rUwS>  
#include <windowsx.h> nE 2w ?  
#pragma comment(lib,"hook.lib") O ;34~k   
#ifdef _DEBUG fAMk<?  
#define new DEBUG_NEW #{m~=1%;Ya  
#undef THIS_FILE 8l?mNapy  
static char THIS_FILE[] = __FILE__; _+OnH!G0  
#endif qM$4c7'4P6  
#define IDM_SHELL WM_USER+1 <WHu</  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A>?_\<Gp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j5rB+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; am'11a@*  
class CAboutDlg : public CDialog TbUouoc  
{ Qb.Ve7c  
 public: H n^)Xw  
  CAboutDlg(); *&=sL  
  // Dialog Data u . xUM  
  //{{AFX_DATA(CAboutDlg) k Y}r^NaQA  
  enum { IDD = IDD_ABOUTBOX }; W<QMUu  
  //}}AFX_DATA q)m0n237P  
  // ClassWizard generated virtual function overrides RjcU0$Hi  
  //{{AFX_VIRTUAL(CAboutDlg) )V6Bzn}9  
 protected: fLtN-w6t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vj_[LFE  
  //}}AFX_VIRTUAL sU|\? pJ  
  // Implementation M_OvIU(E  
 protected: }MCh$  
  //{{AFX_MSG(CAboutDlg) D(' w<9.  
  //}}AFX_MSG i40'U?eG~6  
  DECLARE_MESSAGE_MAP() )w t mc4'  
}; R7nT,7k.  
 1?oX"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dbE]&w`?d  
{ K1gZ>FEY|N  
 //{{AFX_DATA_INIT(CAboutDlg) ?ZqvR^  
 //}}AFX_DATA_INIT P[G.LO  
} As y&X  
"CX@a"  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |= o)|z2  
{ Q[wTV3d  
 CDialog::DoDataExchange(pDX); g5YDRL!Wh  
 //{{AFX_DATA_MAP(CAboutDlg) @MoBR.  
 //}}AFX_DATA_MAP P<tHqN !q  
} 1GaM!OC9  
YLx4qE  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) AgBXB%).  
 //{{AFX_MSG_MAP(CAboutDlg) d :a*;F  
 // No message handlers RCL}bE  
 //}}AFX_MSG_MAP -](NMRqfN  
END_MESSAGE_MAP() 9i=HZ\s3  
Sb/`a~q ^  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xk#q_!(j  
: CDialog(CCaptureDlg::IDD, pParent) @{X<|,W9w  
{ &P0jRT3e#Y  
 //{{AFX_DATA_INIT(CCaptureDlg) X%Lhu6F  
  m_bControl = FALSE; t)i{=8 rq  
  m_bAlt = FALSE; $M0F~x  
  m_bShift = FALSE;  UZV\]Y  
  m_Path = _T("c:\\"); qdOUvf  
  m_Number = _T("0 picture captured."); _<8~CWo:  
  nCount=0; qDV t  
  bRegistered=FALSE; @mJ# ~@*(  
  bTray=FALSE; e2dg{n$6"  
 //}}AFX_DATA_INIT f i_'Ny>#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 r=J+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R/O>^s!Co  
} !bq3c(d  
Qms,kX  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,(@JNtx  
{ M SnRx*-  
 CDialog::DoDataExchange(pDX); g0Ff$-#7  
 //{{AFX_DATA_MAP(CCaptureDlg) :kU-ol$  
  DDX_Control(pDX, IDC_KEY, m_Key); #H5i$ o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); BKV,V/*p  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (*K=&e0O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?=dp]E{  
  DDX_Text(pDX, IDC_PATH, m_Path); MB!_G[R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [wO|P{8\"  
 //}}AFX_DATA_MAP blk4@pg  
} u^ 3,~:E  
JQ~[$OGH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SJJ[y"GvD  
//{{AFX_MSG_MAP(CCaptureDlg) SZ&I4-  
 ON_WM_SYSCOMMAND() 7:S4 Ur  
 ON_WM_PAINT() hHsN(v  
 ON_WM_QUERYDRAGICON() Po1/_# mu  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0XWhSrHM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mH,L,3R;R  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l} =@9A@  
//}}AFX_MSG_MAP %@~;PS3kd  
END_MESSAGE_MAP() TpH-_ft  
' O+)[D  
BOOL CCaptureDlg::OnInitDialog() DTMoZm  
{ F*['1eAmdY  
 CDialog::OnInitDialog(); 11g_!X -g@  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~ubcD6f  
 ASSERT(IDM_ABOUTBOX < 0xF000); v.q`1D1=t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "T4buTXJ  
 if (pSysMenu != NULL) *De}3-e1b  
 { \+T U{vr  
  CString strAboutMenu; _pN:p7l(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); n([9U0!gu  
  if (!strAboutMenu.IsEmpty()) )s~szmJoVD  
  { /n3Qcht  
   pSysMenu->AppendMenu(MF_SEPARATOR); u==`]\_@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A0l-H/l7  
  } ]F#}8$  
 } 1KMSBLx  
 SetIcon(m_hIcon, TRUE); // Set big icon "|^-Yk\U  
 SetIcon(m_hIcon, FALSE); // Set small icon !XqU'xxC  
 m_Key.SetCurSel(0); buu /Nz$  
 RegisterHotkey(); ,vh $G 7D  
 CMenu* pMenu=GetSystemMenu(FALSE); N87)rhXSo,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;ipT0*Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EZee kxs  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); WZQ EBXs  
 return TRUE; // return TRUE unless you set the focus to a control 6g-Q  
} >At* jg48  
@d1YN]ede  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) qGXY  
{ >|1$Pv?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) r?$ V;Z  
 { QnTKo&|9  
  CAboutDlg dlgAbout; ' 5xvR G  
  dlgAbout.DoModal(); t}wwRWo2?f  
 } dZ,IXA yB  
 else wsEOcaie  
 { &`%J1[dy  
  CDialog::OnSysCommand(nID, lParam); bn#'o(Lp  
 } 2/>u8j  
} F.cKg~E|e  
WdZ_^  
void CCaptureDlg::OnPaint() ]k# iA9I  
{ eD,'M  
 if (IsIconic()) .gclE~h.  
 { gski:C   
  CPaintDC dc(this); // device context for painting M3 &GO5<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); L6 IIk  
  // Center icon in client rectangle =fcM2O#$  
  int cxIcon = GetSystemMetrics(SM_CXICON); k4-S:kVo  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;W?mQUo:P8  
  CRect rect; ( &!RX.i  
  GetClientRect(&rect); PSHzB! H=n  
  int x = (rect.Width() - cxIcon + 1) / 2; ey@{Ng#  
  int y = (rect.Height() - cyIcon + 1) / 2; eqSCE6r9x  
  // Draw the icon 2Bz\Tsp  
  dc.DrawIcon(x, y, m_hIcon); ;Qi0j<dXd  
 } <  UD90}  
 else re)7h$f}  
 { E"zC6iYZ;  
  CDialog::OnPaint(); k!"6mo@rd  
 } [:gp_Z&  
} ,v#O{ma  
{HtW`r1)Tt  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4Ifz-t/  
{ `rest_vu  
 return (HCURSOR) m_hIcon; u\q(v D.  
} Vj[hT~{f  
'm TQ=1  
void CCaptureDlg::OnCancel() _-|+k  
{ & d_2WQ}  
 if(bTray) L]* 5cH  
  DeleteIcon(); G$[Hm\V  
  CDialog::OnCancel(); gx.\&W b  
} Yq>K1E|  
lFN|)(X  
void CCaptureDlg::OnAbout() Y~k,AJ{ ^  
{ q&2L@l3A  
 CAboutDlg dlg; t\WU}aKML  
 dlg.DoModal(); B8~bx%)3T  
} zyB>peAp6j  
INEE 37%  
void CCaptureDlg::OnBrowse() pnTz.)'46  
{ fXSuJ<G  
 CString str; u&Yd+');  
 BROWSEINFO bi; "$.B@[iY@  
 char name[MAX_PATH]; [0!*<%BgK'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); kjF4c6v  
 bi.hwndOwner=GetSafeHwnd(); }t*:EgfI  
 bi.pszDisplayName=name; +GEdVB  
 bi.lpszTitle="Select folder"; 'iU+mRLp  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -_M':  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 73l,PJ  
 if(idl==NULL) ~t<uX "K  
  return; a Z8f>t1Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k'NP+N<M  
 str.ReleaseBuffer(); q)3QmA~  
 m_Path=str; T>|Y_3YO_a  
 if(str.GetAt(str.GetLength()-1)!='\\') OHv4Yy]$B  
  m_Path+="\\"; Md&K#)9,(  
 UpdateData(FALSE); Dxe]LES\]  
} |$C fm}  
1}~ZsrF  
void CCaptureDlg::SaveBmp() oDWNOw  
{ Y,?kS dS  
 CDC dc; d~q7!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (6i4N2  
 CBitmap bm; 40O@a:q*  
 int Width=GetSystemMetrics(SM_CXSCREEN); q2U?EP{8~  
 int Height=GetSystemMetrics(SM_CYSCREEN); 32Wa{LG;2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7NkMr8[}F  
 CDC tdc; B r6tgoA  
 tdc.CreateCompatibleDC(&dc); <tW/9}@p9  
 CBitmap*pOld=tdc.SelectObject(&bm); sB!6"D5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :<v@xOzxx  
 tdc.SelectObject(pOld); YIF|8b\  
 BITMAP btm; aTkMg  
 bm.GetBitmap(&btm); CIVV"p`}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^iWJqpLe  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); g"N&*V2  
 BITMAPINFOHEADER bih; P?@o?  
 bih.biBitCount=btm.bmBitsPixel; p) ?6~\F:  
 bih.biClrImportant=0; Js(MzL  
 bih.biClrUsed=0; )"]( ?V  
 bih.biCompression=0; Mp(;PbVD  
 bih.biHeight=btm.bmHeight; ';m;K (g  
 bih.biPlanes=1; "5v^6R9e  
 bih.biSize=sizeof(BITMAPINFOHEADER); @O|`r(le  
 bih.biSizeImage=size; :`c@&WF8  
 bih.biWidth=btm.bmWidth; f?TS#jG4}  
 bih.biXPelsPerMeter=0; ( j:eky  
 bih.biYPelsPerMeter=0;  & [ ,*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dM-~Qo  
 static int filecount=0; n(.L=VuXn  
 CString name; \ 0Ba?  
 name.Format("pict%04d.bmp",filecount++); j Y(|z*|  
 name=m_Path+name; 89{`GKWX  
 BITMAPFILEHEADER bfh; zYM0?O8pJ~  
 bfh.bfReserved1=bfh.bfReserved2=0; e-nwR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $RYOj{1  
 bfh.bfSize=54+size; R[rOzoNp0  
 bfh.bfOffBits=54; FH{p1_kZ=  
 CFile bf; {{AZW   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hxt;sQAo{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); q3`~uTzk  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q. j$]?PQ  
  bf.WriteHuge(lpData,size); C=bQ2t=Z  
  bf.Close(); U;M !jj  
  nCount++; Gz4LjMQ &  
 } 7eW6$$ju,N  
 GlobalFreePtr(lpData); C}ASVywc,1  
 if(nCount==1) 4y!GFhMh  
  m_Number.Format("%d picture captured.",nCount); rxj#  
 else `XM0Mm%  
  m_Number.Format("%d pictures captured.",nCount); cYBjsN(!A|  
  UpdateData(FALSE); 6!8uZ>u%Vg  
} !r9rTS]  
?X Rl\V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !}sF#  
{ R+2~%|{d  
 if(pMsg -> message == WM_KEYDOWN) ],{M``]q  
 { ZZYtaVF:  
  if(pMsg -> wParam == VK_ESCAPE) w_DaldK*  
   return TRUE; s<oT,SPt  
  if(pMsg -> wParam == VK_RETURN) PS0/O k  
   return TRUE; cH5RpeP  
 } 221}xhn5  
 return CDialog::PreTranslateMessage(pMsg); Htfq?\ FD  
} P76gJ@#m  
<sX_hIA^Fx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ..w$p-1  
{ " t?44[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {1+meE  
  SaveBmp(); ":qS9vW  
  return FALSE; }h* j{b,  
} QU(Lv(/O  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #V$sb1u  
 CMenu pop; HZjuL.Tj  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `R!2N4|;  
 CMenu*pMenu=pop.GetSubMenu(0); FEX67A8 /;  
 pMenu->SetDefaultItem(ID_EXITICON); y|NY,{:]  
 CPoint pt; W@i|=xS?  
 GetCursorPos(&pt); MO|Pv j~[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,@I\'os  
 if(id==ID_EXITICON) J(A+mYr{:  
  DeleteIcon(); KFy|,@NI  
 else if(id==ID_EXIT) PZ#aq~>w  
  OnCancel(); mo,"3YW  
 return FALSE; L0w2qF  
} 4G hg~0  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L">m2/ HG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) er2;1TW3E  
 AddIcon(); EfkBo5@Qi  
 return res; M:L-j{?y_  
} v- p8~u1N  
# %'%LY=  
void CCaptureDlg::AddIcon() RRzLQ7J  
{ t~.^92]s|  
 NOTIFYICONDATA data; ad9u;uS  
 data.cbSize=sizeof(NOTIFYICONDATA); rrq7UJ;  
 CString tip; ;F"Tu  
 tip.LoadString(IDS_ICONTIP); [E"3 ?p  
 data.hIcon=GetIcon(0); .y0u"@iF  
 data.hWnd=GetSafeHwnd(); Yv2L0bUo:  
 strcpy(data.szTip,tip); >h~>7i(A  
 data.uCallbackMessage=IDM_SHELL; {hm-0Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *~w?@,}  
 data.uID=98; SpOSUpl%  
 Shell_NotifyIcon(NIM_ADD,&data); %e_){28 n  
 ShowWindow(SW_HIDE); +;Gvp=hk  
 bTray=TRUE; e@& 2q{Gi=  
} QUg<~q)Oq  
Hl*#iUq  
void CCaptureDlg::DeleteIcon() lTFo#p_(  
{ "{d[V(lE"  
 NOTIFYICONDATA data; 7M_GGjP  
 data.cbSize=sizeof(NOTIFYICONDATA); \jS^+Xf?^  
 data.hWnd=GetSafeHwnd(); f# hmMa  
 data.uID=98; s?fEorG  
 Shell_NotifyIcon(NIM_DELETE,&data); W)Y:2P<.  
 ShowWindow(SW_SHOW); uC6e2py<[  
 SetForegroundWindow(); 2z1r|?l  
 ShowWindow(SW_SHOWNORMAL); Ik@MIxLK  
 bTray=FALSE; 1F+nWc2b  
} ju4wU; Nu  
&4)PW\ioY  
void CCaptureDlg::OnChange() AJ6O>Euq  
{ I*mBU^<9V  
 RegisterHotkey(); =/4}!B/  
} 84s:cO  
2P{! n#"  
BOOL CCaptureDlg::RegisterHotkey() \lyHQ-gWhc  
{ = N:5#A  
 UpdateData(); .TNJuuO  
 UCHAR mask=0; 6)FM83zk)K  
 UCHAR key=0; pBn;:  
 if(m_bControl) P(3$XMx  
  mask|=4; n@S|^cH  
 if(m_bAlt) RER93:(  
  mask|=2; %WYveY  
 if(m_bShift) A-eCc#I  
  mask|=1; |>-0q~  
  key=Key_Table[m_Key.GetCurSel()]; zOJzQZ~  
 if(bRegistered){ W#wC  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZB5NTNf>  
  bRegistered=FALSE; u!b0 <E  
 } 3ZvQUH/{W  
 cMask=mask; v{8r46Y~Z)  
 cKey=key; /)rv Ndn  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a`Q-5* \;z  
 return bRegistered; SL_JA  
} Ppx4#j  
Wck WX]};S  
  四、小结 pwF])uf*{\  
y@Td]6|f  
  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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