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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: pd7NF-KD  
  WP+oFkw>  
  一、实现方法 a]/>ra5{  
%i-c0|,T4  
  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: #9xd[A : N  
.5,(_p^  
#pragma data_seg("shareddata") &[/w_| b  
HHOOK hHook =NULL; //钩子句柄 [[Fx[  
UINT nHookCount =0; //挂接的程序数目 M|qteo  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 dhr3,&+T2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 M&U j^K1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;YX4:OBqr  
static int KeyCount =0; ez^@NK  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _/!y)&4"  
#pragma data_seg() NchXt6$i9  
 &8_gRP  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 &n?^$LTPY  
o=?C&f{  
  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: M9@ri^x  
>W`4aA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR xA$nsZ]  
cKey,UCHAR cMask) @reeO=  
{ 1/-43B  
 BOOL bAdded=FALSE; ICkp$u^  
 for(int index=0;index<MAX_KEY;index++){ tAte)/0C  
  if(hCallWnd[index]==0){ Pgus42f%  
   hCallWnd[index]=hWnd; q**G(}K  
   HotKey[index]=cKey; OYmR<x5y/  
   HotKeyMask[index]=cMask; j;3[KLmuK%  
   bAdded=TRUE; `Ru3L#@  
   KeyCount++; F[[TWf/  
   break; 7{qy7,Gp  
  } 1u(.T0j7f  
 } .?e\I`Kk^'  
 return bAdded; MFm"G  
} $Gv9m  
//删除热键 .h5[Q/*h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P7MeX(Tay  
{ HcV"X,7S  
 BOOL bRemoved=FALSE; Xo*%/0q'  
 for(int index=0;index<MAX_KEY;index++){ uDSxTz{  
  if(hCallWnd[index]==hWnd){ OP|8Sk6 r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z(_ZAB%+D  
    hCallWnd[index]=NULL; 5-0{+R5v  
    HotKey[index]=0; B7<Kc  
    HotKeyMask[index]=0; %ck]S!}6  
    bRemoved=TRUE; Bk\Gj`"7  
    KeyCount--; &0(  
    break; Y.U[wL>  
   } 0`A~HH}  
  } !i%"7tQ3$  
 } 3LTcEd  
 return bRemoved; e$uiJNS2  
} B8%{}[q  
P#/HTu5q7  
-,{-bi  
  DLL中的钩子函数如下: ?9=9C"&s  
j$Je6zq0x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n?urE-_  
{ JiU9CeD3  
 BOOL bProcessed=FALSE; 3y~r72J  
 if(HC_ACTION==nCode) S#Sb]  
 { ~ Yngkt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y&=ALx@  
   switch(wParam) $Qy7G{XJ[^  
   {  %-AE]-/HI  
    case VK_MENU: k8uvNLA)a  
     MaskBits&=~ALTBIT; 0% #<c p  
     break; PeE/iZ.  
    case VK_CONTROL: e=QK}gzX  
     MaskBits&=~CTRLBIT; @b3#X@e}  
     break; N#_GJSG_|  
    case VK_SHIFT: >xn}N6Rj2~  
     MaskBits&=~SHIFTBIT; awUx=%ERtA  
     break; fQ=MJ7l  
    default: //judge the key and send message ^p/Ob'!  
     break; b4""|P?L  
   } *cg( ?yg  
   for(int index=0;index<MAX_KEY;index++){ 3u\;j; Td!  
    if(hCallWnd[index]==NULL) GzTq5uU&  
     continue; ]}6w#)]"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;u(Du-Os!  
    { Y05P'Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [J0 v&{)?  
     bProcessed=TRUE; ,xT?mt}P  
    } kz S=g|_  
   } l@hjP1o  
  } [|3>MZ2/  
  else if((lParam&0xc000ffff)==1){ //有键按下 a3 >zoN  
   switch(wParam) ^:jN3@ Q%  
   { xyE1Gw`V  
    case VK_MENU:  l"zUv  
     MaskBits|=ALTBIT; lRP1&FH0  
     break; VNtPKtx\  
    case VK_CONTROL: x4#T G  
     MaskBits|=CTRLBIT; 7.+#zyF  
     break; Sm2>'C  
    case VK_SHIFT: KZBrE$@%5  
     MaskBits|=SHIFTBIT; RP`2)/sMT  
     break; m2Uc>S  
    default: //judge the key and send message ozr9>b>M  
     break; U^Tp6vN d  
   } 'iLH `WE  
   for(int index=0;index<MAX_KEY;index++){ &wetzC )  
    if(hCallWnd[index]==NULL) t%r :4,  
     continue; ARfRsPxr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :Ld!mRZF  
    { cxYfZ4++m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )Os Lrq/  
     bProcessed=TRUE; (HN4g;{  
    } Yp4c'Zk  
   } [W,-1.$!dM  
  } ;#G%U!p  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /LQ:Sv7  
   for(int index=0;index<MAX_KEY;index++){ !1uzX Kb  
    if(hCallWnd[index]==NULL) Ld|V^9h1;  
     continue; !)Rr] ~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]wuy_+$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4o9$bv  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $'[q4wo<  
   } r5/R5Ga^  
  } P l{QOR  
 }  9|S`ub'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); " B@jfa%  
} ad`_>lA4Lp  
? 4)v`*  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Vul+]h[!h  
ZcryAm:I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f3 ]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oVB"f  
I/UQ'xx  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: I*1S/o_xI  
uf@U:V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wy4q[$.4v  
{ e4qj .b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) IvW@o1Q  
 { %3a|<6  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }BN\/;<A  
  SaveBmp(); >v0:qN7|  
  return FALSE; G+Dpma ]  
 } MMD<I6Iyv  
 …… //其它处理及默认处理 '.p? 6k!K  
} TV{)n'aA  
$+:(f{Va*  
6d{j0?mM  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 L=7rDW)aa  
& QY#3yj=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Y5jYmP<  
'H=weH  
  二、编程步骤 AQci,j"  
*:arva5  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; t]TyXAr~  
qB JRS'6'9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~Ob8i1S>  
.k]#XoE  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 4 10:%WGc  
m,NMTyJoz  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; aii'}c  
POBpJg  
  5、 添加代码,编译运行程序。 VC=6uB  
>RR<eYu7m  
三、程序代码 4Vx+[8W  
/w~C~6z @!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9N}W(>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) kGD|c=K}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4!2SS  
#if _MSC_VER > 1000 A[ 1)!e  
#pragma once lCE2SKj  
#endif // _MSC_VER > 1000 XZ@ >]P  
#ifndef __AFXWIN_H__ ? -{IsF^  
#error include 'stdafx.h' before including this file for PCH X RRJ)}P  
#endif eG^z*`**  
#include "resource.h" // main symbols l\U*sro<  
class CHookApp : public CWinApp ype"7p\  
{ 6bJ"$o  
 public: <NL+9lR  
  CHookApp(); 4[H,3}p9H  
  // Overrides *dVD  
  // ClassWizard generated virtual function overrides c'lIWuL)  
  //{{AFX_VIRTUAL(CHookApp) !pS~'E&q  
 public: *(VbPp_H_  
  virtual BOOL InitInstance(); s7Qyfe&>  
  virtual int ExitInstance(); h *waRD  
  //}}AFX_VIRTUAL YUS?]~XC7x  
  //{{AFX_MSG(CHookApp) r1hD %a  
  // NOTE - the ClassWizard will add and remove member functions here. s KCGuw(mh  
  // DO NOT EDIT what you see in these blocks of generated code ! wL'C1Vr  
  //}}AFX_MSG UNY@w=]<  
  DECLARE_MESSAGE_MAP() iDR6?fP  
}; rUvwpP"k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]kH}lr yG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YrKFa%k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |N6mTB2  
BOOL InitHotkey(); >2t cEz%  
BOOL UnInit(); iGyVG41U  
#endif %)dI2 J^Xf  
?P YNE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TwwIt5_fN  
#include "stdafx.h" c_[ JjG^?P  
#include "hook.h" =G[ H,;W  
#include <windowsx.h> Cea"qNq=k  
#ifdef _DEBUG {z-NlH  
#define new DEBUG_NEW Xv]*;Bq:SK  
#undef THIS_FILE H7J`]nr6  
static char THIS_FILE[] = __FILE__; ZG!x$ yi$  
#endif _i.({s&_9  
#define MAX_KEY 100 -D$3!ccX  
#define CTRLBIT 0x04 8\P JSr  
#define ALTBIT 0x02 9c:5t'Qt5.  
#define SHIFTBIT 0x01 2kC^7ZAwu  
#pragma data_seg("shareddata") ~S! L!qY  
HHOOK hHook =NULL; jf2y0W>6s  
UINT nHookCount =0; ?! _u,sT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey s%FP6u7[i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT kzW\z4f  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -Zttj/K  
static int KeyCount =0; IBzHR[#,^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift EmYO5Whi  
#pragma data_seg() 5wy;8a  
HINSTANCE hins; @_G` Ok4  
void VerifyWindow(); GsR-#tV@  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) , &-S?|  
//{{AFX_MSG_MAP(CHookApp) Hu[8HzJo  
// NOTE - the ClassWizard will add and remove mapping macros here. sn2r >m3  
// DO NOT EDIT what you see in these blocks of generated code! #^"hqNwA  
//}}AFX_MSG_MAP Cq TH!'N  
END_MESSAGE_MAP() 7^`RP e^a+  
9 J$Y,Z  
CHookApp::CHookApp() X9p+a,  
{ }3bQ>whF  
 // TODO: add construction code here, ;|2U f   
 // Place all significant initialization in InitInstance 2#,8evH  
} Vj#%B.#Zbf  
~:R4))qpg  
CHookApp theApp; oBhL}r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -Mit$mFn  
{ <m-Ni  
 BOOL bProcessed=FALSE; ^[k6]1h  
 if(HC_ACTION==nCode) hnH)Jy;>  
 { dO Y lI`4  
  if((lParam&0xc0000000)==0xc0000000){// Key up +#&el//  
   switch(wParam) O8!!UA8V  
   { = ?y^O0v  
    case VK_MENU: 8 ))I$+  
     MaskBits&=~ALTBIT; d#x8O4S%i2  
     break; O e0KAn  
    case VK_CONTROL: y}3 `~a  
     MaskBits&=~CTRLBIT; EU`' 8*4  
     break; c80"8r  
    case VK_SHIFT: \ x>NB  
     MaskBits&=~SHIFTBIT; wWp?HDl"M  
     break; Fj[ dO&  
    default: //judge the key and send message UHTb61Gs  
     break; j@kRv@  
   } 2b{@]Fp  
   for(int index=0;index<MAX_KEY;index++){ bQ${8ZO  
    if(hCallWnd[index]==NULL) krnvFZRTQ  
     continue; !XG/,)A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gl3 `e&7  
    { EbHUGCMO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @U7U?.p  
     bProcessed=TRUE; )wyu+_:  
    } ;h*"E(P p  
   } 8trm`?>  
  } 7z0;FW3>9  
  else if((lParam&0xc000ffff)==1){ //Key down X"]mR7k  
   switch(wParam) FQv02V+&<  
   { o =jX  
    case VK_MENU: ?Mgt5by  
     MaskBits|=ALTBIT; &**.naSo  
     break; K~9 jin  
    case VK_CONTROL: r;5 AY  
     MaskBits|=CTRLBIT; }K qw\]`  
     break; SO8|]Fk  
    case VK_SHIFT: AmrJ_YP/t~  
     MaskBits|=SHIFTBIT; l.Lc]ZpB  
     break; ,sy / r V  
    default: //judge the key and send message &El[  
     break; '<U[;H9\  
   } +eH=;8  
   for(int index=0;index<MAX_KEY;index++) v@<lEG#$"|  
   { 's%ct}y\J  
    if(hCallWnd[index]==NULL) b_"V%<I  
     continue; Qcy+ {j]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =-#iXP@  
    { TO;]9`~;Mu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x Ps& CyI  
     bProcessed=TRUE; YC+ZVp"v  
    } LO Yyj?^7  
   }  _j?=&tc  
  } >LRaIU>  
  if(!bProcessed){ YP@ ?j  
   for(int index=0;index<MAX_KEY;index++){ #|2g{7 g*  
    if(hCallWnd[index]==NULL) q@=#`746e  
     continue; ABS BtH ?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5juCeG+Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z8rh*Rfxd  
   } B3i=pcef  
  } Q'V,?#  
 } ^9m^#"ZW`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6CzvRvA*P  
} 9dhFQWz"  
+[go7A$5  
BOOL InitHotkey() ;z=C^'  
{ e?'k[ES^  
 if(hHook!=NULL){ GCmVmOdKr  
  nHookCount++; %#;(]7Zq  
  return TRUE; aABE= 9Y  
 } fn"jYSy  
 else nD{;4$xP`  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6T aT_29  
  if(hHook!=NULL) f0s<Y  
   nHookCount++; 7G #e~,M5  
  return (hHook!=NULL); !t [%'!v  
} k?*DBXJv  
BOOL UnInit() w6%CB E2  
{ 1x5CsmS  
 if(nHookCount>1){ #esu@kMU`  
  nHookCount--; H@bmLq  
  return TRUE; )#TJw@dNf^  
 } ?p\II7   
 BOOL unhooked = UnhookWindowsHookEx(hHook); %QcG^R  
 if(unhooked==TRUE){ ? Gu_UW  
  nHookCount=0;  /o3FK  
  hHook=NULL; Hr.JZ>~<  
 } 4Og GZ  
 return unhooked; V$]a&wM<5  
} s)ajy^6'M  
/bj`%Q.n  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AZ@Zo'  
{ rsj}hS$  
 BOOL bAdded=FALSE; |gxB; GG  
 for(int index=0;index<MAX_KEY;index++){ D&lXi~Z%.  
  if(hCallWnd[index]==0){ <'yC:HeAwD  
   hCallWnd[index]=hWnd; BY2txLLB  
   HotKey[index]=cKey; z Clm'X/  
   HotKeyMask[index]=cMask; YuW\GSV00  
   bAdded=TRUE; E MbI\=>yS  
   KeyCount++; F n Rxc  
   break; !6`nN1A  
  } i3!$M/_]  
 } OnPLz"-  
 return bAdded; G U/k^ Qy  
} 2\W<EWJ@  
M L_J<|,J  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /9^0YC;Y*  
{ y#W8] <dS"  
 BOOL bRemoved=FALSE; s+t eYL#Zi  
 for(int index=0;index<MAX_KEY;index++){ KFrmH  
  if(hCallWnd[index]==hWnd){ n;Wf|>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ GM92yi!8  
    hCallWnd[index]=NULL; r_CN/a  
    HotKey[index]=0; VL1z$<vVXt  
    HotKeyMask[index]=0; ?(hQZR 0e  
    bRemoved=TRUE; mT$tAwzTC{  
    KeyCount--; ,;& PKY  
    break; ^^(ZK 6d  
   } oW9rl]+  
  } FAGVpO[  
 } vDb}CQ\  
 return bRemoved; ;]ew>P)  
} d'J?QH!N0  
|"*:ZSj  
void VerifyWindow() : \`MrI^  
{ bHG>SW\]`?  
 for(int i=0;i<MAX_KEY;i++){ CK#PxT?"  
  if(hCallWnd!=NULL){ T}On:*&  
   if(!IsWindow(hCallWnd)){ "61n?Z#,M[  
    hCallWnd=NULL; :S2MS{>Mo  
    HotKey=0; >FhBl\oIi  
    HotKeyMask=0; 7dW&|U  
    KeyCount--; ;sJ2K"c  
   } (]dZ+"O{  
  } GDntGTE~sk  
 } o%7yhCY  
} XcneH jpR  
] lTfi0}g_  
BOOL CHookApp::InitInstance() \`x'g)z(i  
{ 34+}u,=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6U]7V  
 hins=AfxGetInstanceHandle(); IA!Kp g W  
 InitHotkey(); lvffQ_t  
 return CWinApp::InitInstance(); Ss}0.5Bq  
} OkXOV   
&Gl&m@-j  
int CHookApp::ExitInstance() ?a(3~dh|  
{ g?sFmD  
 VerifyWindow(); W,+91rup  
 UnInit(); Pl>t\`1:|A  
 return CWinApp::ExitInstance(); R~([  
} tDVdl^#  
:gC2zv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file egvWPht'_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zq&lxySa  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gw^+[}U#  
#if _MSC_VER > 1000 !8].Z"5J  
#pragma once $Tza<nA  
#endif // _MSC_VER > 1000 *q BZi;1  
biD7(AK  
class CCaptureDlg : public CDialog hd' n"  
{ }rZp(FG@*  
 // Construction CXA8V"@&b/  
 public: &9>d  
  BOOL bTray; v;7u"9t  
  BOOL bRegistered; $G[##j2  
  BOOL RegisterHotkey(); > %,tyJ~  
  UCHAR cKey; +l\Dp  
  UCHAR cMask; `1gsrHi4N  
  void DeleteIcon(); ~c"c9s+o  
  void AddIcon(); th{h)( +H  
  UINT nCount; -u{:39y{n  
  void SaveBmp(); HYS7=[hv6  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CDhk!O..  
  // Dialog Data B=7L+6  
  //{{AFX_DATA(CCaptureDlg) Rx.0P6s  
  enum { IDD = IDD_CAPTURE_DIALOG }; tti.-  
  CComboBox m_Key; n >'}tT)U  
  BOOL m_bControl; (0r6_8e6xv  
  BOOL m_bAlt; 3 0Z;}<)9  
  BOOL m_bShift; ak zb<aT  
  CString m_Path; Z)<>d.  
  CString m_Number; $Fj7'@1(  
  //}}AFX_DATA ;_!;D#:  
  // ClassWizard generated virtual function overrides '4iu0ie>D  
  //{{AFX_VIRTUAL(CCaptureDlg) 5ym =2U  
 public: 4-MA!&  
  virtual BOOL PreTranslateMessage(MSG* pMsg); s$;v )w$  
 protected: ofJ@\xS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sx;1V{|g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); wC19  
  //}}AFX_VIRTUAL #X+)  
  // Implementation *7ox_ R@  
 protected: fXN;N&I  
  HICON m_hIcon; YG_3@`-<  
  // Generated message map functions ZHT.+X:_  
  //{{AFX_MSG(CCaptureDlg) iiu\_ a=0b  
  virtual BOOL OnInitDialog(); ty ~U~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f`Nu]#i  
  afx_msg void OnPaint(); rv+"=g  
  afx_msg HCURSOR OnQueryDragIcon(); VH/_0  
  virtual void OnCancel(); lH[N*9G(  
  afx_msg void OnAbout(); ?Gb 18m  
  afx_msg void OnBrowse(); vCJjZ%eO%D  
  afx_msg void OnChange(); wS4zAu  
 //}}AFX_MSG 2 IGAZ%%  
 DECLARE_MESSAGE_MAP() 7Y-GbG.'  
}; n%Fa;!S  
#endif P _9O8"W  
n`6vM4rM)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c7'Pzb)'  
#include "stdafx.h" !e?\> '  
#include "Capture.h" ']V 2V)t  
#include "CaptureDlg.h" oD.f/hi0|  
#include <windowsx.h> wi!Ml4Sb  
#pragma comment(lib,"hook.lib") qYE-z( i  
#ifdef _DEBUG MSA*XDnN  
#define new DEBUG_NEW ]5^u^  
#undef THIS_FILE QDU^yVa_  
static char THIS_FILE[] = __FILE__; 1iUy*p65:  
#endif ]p~XTZgW  
#define IDM_SHELL WM_USER+1 M$w^g8F27H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +!X^E9ra  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9%4rO\q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lGxG$0`;;  
class CAboutDlg : public CDialog Ji=E 1R  
{ )%*uMuF  
 public: _9<Ko.GVq  
  CAboutDlg(); )J 0'We  
  // Dialog Data D.RHvo~6  
  //{{AFX_DATA(CAboutDlg) !dZHG R  
  enum { IDD = IDD_ABOUTBOX }; =!7yX ;|  
  //}}AFX_DATA $Cte$ jg{;  
  // ClassWizard generated virtual function overrides k+&|*!j  
  //{{AFX_VIRTUAL(CAboutDlg) )=~1m85+5B  
 protected: sC/T)q2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \i{=%[c  
  //}}AFX_VIRTUAL )4j#gHN\  
  // Implementation Y1+f(Q  
 protected: mgS%YG  
  //{{AFX_MSG(CAboutDlg) Hf#/o{=~}  
  //}}AFX_MSG QQqWJq~  
  DECLARE_MESSAGE_MAP() m@OgT<E]_  
}; N~SG=\rP;o  
^}9Aq $R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6zyozJA  
{ ,rQznE1e  
 //{{AFX_DATA_INIT(CAboutDlg) zL1H[}[z+  
 //}}AFX_DATA_INIT w+P bT6;  
} *2@Ne[dYEF  
\07 s'W U  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UA}k"uM  
{ Aj-}G^>#  
 CDialog::DoDataExchange(pDX); w+ bMDp  
 //{{AFX_DATA_MAP(CAboutDlg) "{|9Yis=  
 //}}AFX_DATA_MAP 74QWGw`,  
} )'92{-A0  
wOINcEdx  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6M F%$K3  
 //{{AFX_MSG_MAP(CAboutDlg) &`{%0r[UD#  
 // No message handlers .hnGHX  
 //}}AFX_MSG_MAP s>^*GQw  
END_MESSAGE_MAP() J7$5<  
yjc:+Y{5'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .BuY[,I+  
: CDialog(CCaptureDlg::IDD, pParent) anHP5gD  
{ dX` _Y  
 //{{AFX_DATA_INIT(CCaptureDlg) 8&B{bS  
  m_bControl = FALSE; -_v[oqf$  
  m_bAlt = FALSE; zAS&L%^tV  
  m_bShift = FALSE; h$y1"!N(  
  m_Path = _T("c:\\"); G ? H`9*y  
  m_Number = _T("0 picture captured."); uG~%/7Qt{  
  nCount=0; ybcQ , e  
  bRegistered=FALSE; ~%m-}Sxc  
  bTray=FALSE; -7>vh|3  
 //}}AFX_DATA_INIT &$|k<{j[<f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s9zdg"c'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UPA))Iv>  
} 0(h *< g:  
 Jcy  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mq do@  
{ 8 }nA8J  
 CDialog::DoDataExchange(pDX); % =br-c  
 //{{AFX_DATA_MAP(CCaptureDlg) 26&^n Uy  
  DDX_Control(pDX, IDC_KEY, m_Key); pu=Q;E_f[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gs7H9%j{U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `dx+Qp  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9co1+y=i{  
  DDX_Text(pDX, IDC_PATH, m_Path); iO(9#rV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); kb Odg:  
 //}}AFX_DATA_MAP ;XRLp:y  
} 1B}6 zJ  
#92 :h6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VrrCW/ o  
//{{AFX_MSG_MAP(CCaptureDlg) .YKQ6  
 ON_WM_SYSCOMMAND() N yFa2Ihd  
 ON_WM_PAINT() R4%!W~K  
 ON_WM_QUERYDRAGICON() OIe {Sx{y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bo4 :|Z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q+[gGe JUF  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,yNPD}@v>  
//}}AFX_MSG_MAP IF(W[J  
END_MESSAGE_MAP() EL;IrtU  
@q}.BcSg  
BOOL CCaptureDlg::OnInitDialog() o5-oQ_ j  
{ 'RC(ss1G  
 CDialog::OnInitDialog(); b`usRoD{+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Eo!1 WRruF  
 ASSERT(IDM_ABOUTBOX < 0xF000); MLG%+@\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @{:E&K1f  
 if (pSysMenu != NULL) kS%FV;9>(  
 { ;^^u_SuH  
  CString strAboutMenu; Kzb&aOw  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;oH17  
  if (!strAboutMenu.IsEmpty()) s*>s;S?{|  
  { .DMeW i  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2G=Bav\n+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); y+)][Wa0  
  } ~*GJO74  
 } hc4<`W{  
 SetIcon(m_hIcon, TRUE); // Set big icon Zrr3='^s  
 SetIcon(m_hIcon, FALSE); // Set small icon {OL*E0  
 m_Key.SetCurSel(0); I3uaEv7OZc  
 RegisterHotkey(); RY8;bUSR  
 CMenu* pMenu=GetSystemMenu(FALSE); ;]D@KxO$dJ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); tKjPLi71  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w}c1zpa  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [=z1~dXKb  
 return TRUE; // return TRUE unless you set the focus to a control 3k` "%R.H  
} >pW8K[  
Z3<>Z\6D  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mT <4@RrB  
{ E3<jH  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >9'G>~P~I=  
 { v`A^6)U#M  
  CAboutDlg dlgAbout; \bw71( Q  
  dlgAbout.DoModal(); " ;_bB"q*  
 } UTGR{>=>  
 else <W2}^q7F^  
 { =;-/( C  
  CDialog::OnSysCommand(nID, lParam); $Q{)AN;m  
 } LyH8T'C~  
} yH#zyO4fD-  
i[`nu#n/  
void CCaptureDlg::OnPaint() Z $ Fh4  
{ GMU.Kt  
 if (IsIconic()) Q:& ,8h[  
 { oUIa/}}w5  
  CPaintDC dc(this); // device context for painting Wp/!;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PwU}<Hrl]  
  // Center icon in client rectangle C18pK8-  
  int cxIcon = GetSystemMetrics(SM_CXICON); %Qgo0  
  int cyIcon = GetSystemMetrics(SM_CYICON); RXh0hD  
  CRect rect; M p:c.  
  GetClientRect(&rect); HK) $ls  
  int x = (rect.Width() - cxIcon + 1) / 2; QDYS}{A:V  
  int y = (rect.Height() - cyIcon + 1) / 2; 58,_  
  // Draw the icon t uo'4%]i  
  dc.DrawIcon(x, y, m_hIcon); UeV2`zIg`  
 } JM!rop^  
 else B;XFPQ#b  
 { d|k6#f-E  
  CDialog::OnPaint(); ?v PwI  
 } !SEHDRp  
} `~vqu69MF9  
KT~J@];Fb  
HCURSOR CCaptureDlg::OnQueryDragIcon() A(X~pP &oF  
{ ?6+GE_VZ  
 return (HCURSOR) m_hIcon; 1v!Xx+}  
} xfCq;?MupW  
S1(. AI~  
void CCaptureDlg::OnCancel() 7GY[l3arxv  
{ hPF9y@lh  
 if(bTray) =;!C7VS  
  DeleteIcon(); "P\k_-a'  
  CDialog::OnCancel(); ZGK*]o =)  
} VJ;n0*/  
mj=$[ y(  
void CCaptureDlg::OnAbout() oRFHq>-.g  
{ 2#~5[PtP^  
 CAboutDlg dlg; L$6{{Tw"2  
 dlg.DoModal(); %>`0hk88  
} L3iY Z>]  
W=41jw  
void CCaptureDlg::OnBrowse() jjL(=n<J<"  
{ 5jD2%"YUV  
 CString str; )%Z<9k  
 BROWSEINFO bi; }+G6`Zd  
 char name[MAX_PATH]; Q+'mBi}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); G/>upnA{w  
 bi.hwndOwner=GetSafeHwnd(); eE5U|y)_  
 bi.pszDisplayName=name; QyQ&xgS  
 bi.lpszTitle="Select folder"; Tu95qL~^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; uoR_/vol8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }D/0&<1  
 if(idl==NULL) uq~$HXdc  
  return; <3zA|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zC #[  
 str.ReleaseBuffer(); S]mXfB(mh  
 m_Path=str; ' _Ij9{M  
 if(str.GetAt(str.GetLength()-1)!='\\') IOmQ1X7,  
  m_Path+="\\"; 37Ux2t  
 UpdateData(FALSE); ts/ rV#s~  
} Q$Qs$  
d?^bCf+<  
void CCaptureDlg::SaveBmp() rdZk2\<  
{ <seb,> :  
 CDC dc; DjUif "v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); :"5'l>la  
 CBitmap bm; 1eQa54n  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0)n#$d>  
 int Height=GetSystemMetrics(SM_CYSCREEN); hvCX,^LoJ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :@# '&(#~  
 CDC tdc; L]I ;{Y  
 tdc.CreateCompatibleDC(&dc); ]`39E"zY  
 CBitmap*pOld=tdc.SelectObject(&bm); `7$0H]*6  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5/4N  Y  
 tdc.SelectObject(pOld); l2Z!;Wm(  
 BITMAP btm; DU(QQ53  
 bm.GetBitmap(&btm); TY}9;QL:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :MPWf4K2s  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tmEF7e`(o  
 BITMAPINFOHEADER bih;  V9\g?w  
 bih.biBitCount=btm.bmBitsPixel; @H[)U/.  
 bih.biClrImportant=0; L:UJur%  
 bih.biClrUsed=0; bso l>M[<  
 bih.biCompression=0; {`~uBz+dJq  
 bih.biHeight=btm.bmHeight; ? IgM=@  
 bih.biPlanes=1; @%Y$@Qb{  
 bih.biSize=sizeof(BITMAPINFOHEADER); fui;F"+1  
 bih.biSizeImage=size; ^y:!=nX^  
 bih.biWidth=btm.bmWidth; a{*r^m'N  
 bih.biXPelsPerMeter=0; eT 8(O36%  
 bih.biYPelsPerMeter=0; zIc%>?w  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <j CD^  
 static int filecount=0; a&oz<4oT  
 CString name; O#Y;s;)i"  
 name.Format("pict%04d.bmp",filecount++); $M%<i~VXe&  
 name=m_Path+name; qQ\&]  
 BITMAPFILEHEADER bfh; 4rkj$  
 bfh.bfReserved1=bfh.bfReserved2=0; \$;Q3t3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); \/=w \Tj  
 bfh.bfSize=54+size;  %T9'dcM  
 bfh.bfOffBits=54; JBzRL"|  
 CFile bf; es]S]}JV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v&}+ps_W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U Px7u%Do  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I !\;NVhv  
  bf.WriteHuge(lpData,size); q6E8^7RtS@  
  bf.Close(); J* V@huF  
  nCount++; jm~(OLg  
 } %&EDh2w>  
 GlobalFreePtr(lpData); oqM(?3 yv  
 if(nCount==1) |Uf[x[  
  m_Number.Format("%d picture captured.",nCount); Wp5w}8g  
 else C|"BMam  
  m_Number.Format("%d pictures captured.",nCount); 2@!Ou$W  
  UpdateData(FALSE); oEfy{54  
} H#P)n R M  
Y;qA@|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *hugQh ]a  
{ kl4u]MyL#  
 if(pMsg -> message == WM_KEYDOWN) R^t )~\d  
 { f+A!w8E  
  if(pMsg -> wParam == VK_ESCAPE) #p<1@,  
   return TRUE; DdAs]e|D[  
  if(pMsg -> wParam == VK_RETURN) "XvM1G&s`  
   return TRUE; ,V$PV,G  
 } !\e&7sV~Q  
 return CDialog::PreTranslateMessage(pMsg); ^uG^XY&ItC  
} F|Y}X|x8Q  
$inpiO|s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "0BuQ{CQ  
{ , Oqd4NS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >$^v@jf  
  SaveBmp(); q ERdQ~M,  
  return FALSE; MSef2|"P#  
} '3n?1x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4q<LNvJA  
 CMenu pop; Z.!tp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); KDt@Xi 6||  
 CMenu*pMenu=pop.GetSubMenu(0); drv"I[}{A  
 pMenu->SetDefaultItem(ID_EXITICON); IiX`l6L~W  
 CPoint pt; u+U '|6)E  
 GetCursorPos(&pt); B Q) 1)8r  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >9?BJv2  
 if(id==ID_EXITICON) ux8:   
  DeleteIcon(); 7&I+mw/X  
 else if(id==ID_EXIT) lQ t&K1m  
  OnCancel(); 0u,OW  
 return FALSE;  ~\0uy3%  
} d-cK`pSB  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -Odk'{nW  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PA=.)8  
 AddIcon(); L%3m_'6QP  
 return res; /Dh[lgF0C  
} |G!PG6%1  
yP&SA+  
void CCaptureDlg::AddIcon() Dg:2*m_!j{  
{ )JYt zc  
 NOTIFYICONDATA data; hqPpRSv'  
 data.cbSize=sizeof(NOTIFYICONDATA); $d@_R^]X  
 CString tip; vZ<@m2  
 tip.LoadString(IDS_ICONTIP); e3|@H'~k  
 data.hIcon=GetIcon(0); g{]C@,W  
 data.hWnd=GetSafeHwnd(); uTSTBI4t  
 strcpy(data.szTip,tip); h3B s  
 data.uCallbackMessage=IDM_SHELL; l7g< $3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yUZ;keQ_Tw  
 data.uID=98; xe4F4FC'  
 Shell_NotifyIcon(NIM_ADD,&data); @D<KG  
 ShowWindow(SW_HIDE); ^p'iX4M  
 bTray=TRUE; cqr4P`Oj  
} EPY64 {  
U ?%1:-#F  
void CCaptureDlg::DeleteIcon() /1h 0 l;  
{ Do&em8i z  
 NOTIFYICONDATA data; AbWnDqv  
 data.cbSize=sizeof(NOTIFYICONDATA); Ym)8L.  
 data.hWnd=GetSafeHwnd(); ]#UyYgPk  
 data.uID=98; ;M<jQntqS{  
 Shell_NotifyIcon(NIM_DELETE,&data); [c{/0*  
 ShowWindow(SW_SHOW); T'n~Qf U  
 SetForegroundWindow(); \~3g*V  
 ShowWindow(SW_SHOWNORMAL); GMY"*J<E  
 bTray=FALSE; ddf# c,SQ  
} B{:JD^V!  
]3+xJz~=  
void CCaptureDlg::OnChange() DOr()X  
{ z[7j`J|Kk  
 RegisterHotkey(); b~M3j&  
} U[!x 0M  
m{U+aqAQK  
BOOL CCaptureDlg::RegisterHotkey() 5#v  
{ ,]OL[m  
 UpdateData(); L5E|1T  
 UCHAR mask=0; }'?N+MN  
 UCHAR key=0; o6FSSKM  
 if(m_bControl) /Dn,;@ZwAi  
  mask|=4; Y#'?3  
 if(m_bAlt) 7 TTU&7l~  
  mask|=2; Zcaec#  
 if(m_bShift) 1:.0^?Gz  
  mask|=1; sC8C><y  
  key=Key_Table[m_Key.GetCurSel()]; p4 \r`  
 if(bRegistered){ .?gpI Zv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4FmT.P  
  bRegistered=FALSE; $)L=MEdx  
 } mN_KAln  
 cMask=mask; JN{.-k4Ha  
 cKey=key; ~*Fbs! ;,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); DPrFBy  
 return bRegistered; @KM !g,f  
} E~=`Ac,G2  
REyk,s2"6  
  四、小结 KL2#Bm_  
J/M_cO*U  
  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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