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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: 5}a"?5J^  
  N8+P  
  一、实现方法 ndOfbu;mf  
 Tb#  
  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: w:Q|?30  
2a[9h #  
#pragma data_seg("shareddata") AMk~dzNt  
HHOOK hHook =NULL; //钩子句柄 pT=2e&  
UINT nHookCount =0; //挂接的程序数目 xv0M  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $!`L"szqD*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5G? .T?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W/v|8-gcK  
static int KeyCount =0; `s}BXKIv}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "T*I|  
#pragma data_seg() F!~l MpuE  
)vHi|~(   
  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。 V} bM!5 H  
R=35 7^[R  
  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: %N{sD[^  
MFTC6L+T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J~dTVBx  
cKey,UCHAR cMask) o>!JrH  
{ N5\{yV21",  
 BOOL bAdded=FALSE; $Q4=37H+  
 for(int index=0;index<MAX_KEY;index++){ nW&$~d  
  if(hCallWnd[index]==0){ rv?!y8\  
   hCallWnd[index]=hWnd; 2nx9#B*/T  
   HotKey[index]=cKey; WF)s*$'uz;  
   HotKeyMask[index]=cMask; r~[B _f!  
   bAdded=TRUE; K\X: G-C9  
   KeyCount++; Mdky^;qq3;  
   break; 9cOx@c+/  
  } E$T(Qu<-  
 } A\C'dZ <N  
 return bAdded; 'bm:u  
} IHVMHOq}'  
//删除热键 tw86:kYEz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yjeL9:jH[  
{ q u:To7  
 BOOL bRemoved=FALSE; %Qd3BZ  
 for(int index=0;index<MAX_KEY;index++){ ZeTL$E[E}  
  if(hCallWnd[index]==hWnd){ FF@`+T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (j=DD6fC  
    hCallWnd[index]=NULL; hfh.eL  
    HotKey[index]=0; x3;jWg~'  
    HotKeyMask[index]=0; s7|3zqi  
    bRemoved=TRUE; R2Yl)2 D  
    KeyCount--; ni0LQuBp  
    break; Y^5"qd|`  
   } j]HE>  
  } uTw|Q{f  
 } {jhcZ"#>\  
 return bRemoved; Z~R dFC  
} Mz}i[|U\  
+_-Y`O!Q  
b_mWu@$  
  DLL中的钩子函数如下: 2*YP"Ryh  
\6LcVik  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {9'hOi50  
{ :f]!O@.~  
 BOOL bProcessed=FALSE; 7%YYr^d  
 if(HC_ACTION==nCode) kc|>Q7~{  
 { (n}%a6M  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?N2X)Y@yi  
   switch(wParam) /KP_Vc:g2_  
   {  b.,$# D{p  
    case VK_MENU: L"9 Gc  
     MaskBits&=~ALTBIT; 7BK46x  
     break; 776 nWw)  
    case VK_CONTROL: !*8#jy  
     MaskBits&=~CTRLBIT; PAr|1i)mB  
     break; .f+9 A>  
    case VK_SHIFT: RSFJu\0}N  
     MaskBits&=~SHIFTBIT; jDJ.  
     break; ^ `E@/<w8  
    default: //judge the key and send message aulaX/'-_  
     break; [[&)cbv  
   } WRY~fM  
   for(int index=0;index<MAX_KEY;index++){ F*X%N_n  
    if(hCallWnd[index]==NULL) w. vY(s  
     continue; G ;jF9i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rBS2>?  
    { ] 'E}   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w2@"PGR  
     bProcessed=TRUE; o6:45  
    } +&?'KZ+Z_v  
   } rQ &S<  
  } FQQ@kP$.  
  else if((lParam&0xc000ffff)==1){ //有键按下 `TAcZl=8  
   switch(wParam) 6l<1A$BQ  
   { I=K[SY,]9  
    case VK_MENU: 4%%B0[Wo_O  
     MaskBits|=ALTBIT; OAY8,C=M  
     break; oAC^4-Ld  
    case VK_CONTROL: i@Vs4E[b  
     MaskBits|=CTRLBIT; U* 4{"  
     break; &1 oaZY w  
    case VK_SHIFT: >]^>gUmq  
     MaskBits|=SHIFTBIT; Io09W^  
     break; 98jD"*W5  
    default: //judge the key and send message .r(^h/IF  
     break; G~O" /WM  
   } 2[XltjO  
   for(int index=0;index<MAX_KEY;index++){ 0&f\7z  
    if(hCallWnd[index]==NULL) $}V7(wu 6@  
     continue; [Yn;G7cK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N*HH,m&  
    { u1wg C#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kz$(V(k<  
     bProcessed=TRUE; 9armirfV'P  
    } "h QV9 [2\  
   } S]vW&r3`  
  } 6xyY+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 KQ-,W8Q5  
   for(int index=0;index<MAX_KEY;index++){ a (P^e)<  
    if(hCallWnd[index]==NULL) P_v0))n{  
     continue; }FHw" {my  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3.B4(9:>,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `B:B7Cpvn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (/('nY  
   } u0wn=Dg  
  } S3b|wUf  
 } u mqLKf=x!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o; 6fvn  
} 9/FG,9  
keqr%:E8  
  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: :EYu 4Y  
56"#Syj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /*AJ+K._  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -*rHB&e  
 bkxk i@t  
  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: ?rky6  
]Jja  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vU?b"n  
{ GJ.kkTMT  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OiYNH~hv  
 { P\Ai|"=&]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j l}!T[5  
  SaveBmp(); Fecx';_1`  
  return FALSE; mx:J>SPA8  
 } 8e]z6:}'E  
 …… //其它处理及默认处理 >0kmRVd  
} Czq1 kz  
xX[?L9RGz  
<Z2(qZ^Z  
  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。 1 ,#{X3  
jB5>y&+  
  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。 I93 ~8wQ  
W^5<XX,ON  
  二、编程步骤 X\o/i\ C}  
-J-3_9I  
  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"; }DJ|9D^yf  
0m]~J_   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hTlnw[I  
%~][?Y ><  
  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; 3Gc ,I:\  
$o/0A  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ~gSwxGT7d  
'bZMh9|  
  5、 添加代码,编译运行程序。 YgO aZqN  
YtV |e|aD  
三、程序代码 fG X1y  
\Oi5=,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1M7\:te*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e} sc]MTM  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V?U%C%C|e  
#if _MSC_VER > 1000 JR H f.?  
#pragma once yjGGqz$  
#endif // _MSC_VER > 1000  %zA2%cq<  
#ifndef __AFXWIN_H__ A/ 7r:yO  
#error include 'stdafx.h' before including this file for PCH gJ<@;O8zu0  
#endif fBHkLRFH  
#include "resource.h" // main symbols = 4BLc  
class CHookApp : public CWinApp sN6 0o 7.  
{ 6V.awg,  
 public: 8#X?k/mzU  
  CHookApp(); y%{*uH}SL  
  // Overrides qk_p}l-F1  
  // ClassWizard generated virtual function overrides _#/!s]$d#  
  //{{AFX_VIRTUAL(CHookApp) [ c ~LY4:  
 public: H.jLGe>  
  virtual BOOL InitInstance(); :5TXA  
  virtual int ExitInstance(); 0C lX  
  //}}AFX_VIRTUAL #)W8.  
  //{{AFX_MSG(CHookApp) ?)Tz'9l  
  // NOTE - the ClassWizard will add and remove member functions here. ?l)}E  
  // DO NOT EDIT what you see in these blocks of generated code ! ^Nd|+}  
  //}}AFX_MSG dH ^b)G4  
  DECLARE_MESSAGE_MAP() 1<XiD 3H;  
}; kA7~Yu5|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c%q}"Y0oh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )ZS:gD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K*([9VZ  
BOOL InitHotkey(); _7-"Vo X  
BOOL UnInit(); W HlD %u  
#endif |#DC.Ga!  
7bgnZ]r8t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <7vIh0  
#include "stdafx.h" ",MK'\E  
#include "hook.h" r~S!<9f  
#include <windowsx.h> mp&Le YYn  
#ifdef _DEBUG K $Mx}m7l  
#define new DEBUG_NEW F'V +2,.  
#undef THIS_FILE c7FfI"7HR  
static char THIS_FILE[] = __FILE__; #Pb7EL#c  
#endif DBj;P|L_  
#define MAX_KEY 100 _4~ng#M*  
#define CTRLBIT 0x04 m NUN6qVP~  
#define ALTBIT 0x02 LU-#=1Q  
#define SHIFTBIT 0x01 qP7&LtU  
#pragma data_seg("shareddata") . 1{vpX  
HHOOK hHook =NULL; 1Y H4a|bc  
UINT nHookCount =0; N:UDbLjw~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ROJ'-Vde9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y9V;IXhDc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "ay,Lr  
static int KeyCount =0; /7UovKKbz  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "<cB73tY  
#pragma data_seg() oiTMP`Y  
HINSTANCE hins; )z ?&" I  
void VerifyWindow(); ~|aeKtCs(.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) USnD7I/b  
//{{AFX_MSG_MAP(CHookApp) `@u+u0  
// NOTE - the ClassWizard will add and remove mapping macros here. EWu iaw.  
// DO NOT EDIT what you see in these blocks of generated code! _0DXQS\  
//}}AFX_MSG_MAP *pcbwd!/  
END_MESSAGE_MAP() ZaukMEq  
?L<UOv7;t  
CHookApp::CHookApp() S7Iu?R_I  
{ vOvxQS}dBp  
 // TODO: add construction code here, tj"v0u?zW  
 // Place all significant initialization in InitInstance H#1*'e>  
} HKEop  
k$UzBxR  
CHookApp theApp; Mm>zpB`qP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +LQs.*  
{ :=iM$_tp'  
 BOOL bProcessed=FALSE; W(u6J#2  
 if(HC_ACTION==nCode) /ygUd8@  
 { SU_] C+  
  if((lParam&0xc0000000)==0xc0000000){// Key up [T}%q"<  
   switch(wParam) %#S"~)  
   { D]G'R5H  
    case VK_MENU: ?c=R"Yg$  
     MaskBits&=~ALTBIT; Pv{,aV\I}  
     break; Z?.p%*>`T=  
    case VK_CONTROL: T>%uRK$  
     MaskBits&=~CTRLBIT; 0%A(dJA6  
     break; ;EE&~&*w  
    case VK_SHIFT: wB1|r{  
     MaskBits&=~SHIFTBIT; dCoi>PO  
     break; ^B&ahk  
    default: //judge the key and send message )"pxry4v7J  
     break; ery?G-  
   } c]g<XVI  
   for(int index=0;index<MAX_KEY;index++){ >'2w\Uk~:  
    if(hCallWnd[index]==NULL) aowPji$H  
     continue; W[1f]w3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) PtPGi^  
    { (N~zJ .o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8Y{}p[UFT  
     bProcessed=TRUE; wH(vX<W-E  
    } G+ $)W u  
   } 5KC\1pe i  
  } $8X tI  
  else if((lParam&0xc000ffff)==1){ //Key down |`)V^e_  
   switch(wParam) %/6e"o  
   { xnhDW7m  
    case VK_MENU: }(g+:]p-  
     MaskBits|=ALTBIT; i)ES;b4  
     break; \ ]kb&Qw  
    case VK_CONTROL: bzj!d|T`  
     MaskBits|=CTRLBIT; {g!exbVf  
     break; _Pfx_+  
    case VK_SHIFT: ~ ];6hxv  
     MaskBits|=SHIFTBIT; Q#J>vwi=  
     break; R>e3@DQ~  
    default: //judge the key and send message >arO$|W  
     break; .Kh(F 6 s  
   } ok\/5oz  
   for(int index=0;index<MAX_KEY;index++) ) v[Knp'  
   { {>UMw>T[  
    if(hCallWnd[index]==NULL) &, Zz  
     continue; -u3SsU)_%N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V'.eesN  
    { b W C~Hv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1EAVMJ  
     bProcessed=TRUE; jy__Y=1}  
    }  'QekQ];  
   } FSYjp{z5  
  } @]ptY*   
  if(!bProcessed){ 8x^H<y=O  
   for(int index=0;index<MAX_KEY;index++){ v_@#hf3  
    if(hCallWnd[index]==NULL) r"u(!~R  
     continue; 'Qs 3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %:be{Y6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RZ/+ K=  
   } ]=86[A-2N  
  } UTK.tg  
 } ;qVEI/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "-j@GCme  
} I 3zitI;  
Pdo5 sve  
BOOL InitHotkey() lc$@Jjg9  
{ A^r [_dyZ  
 if(hHook!=NULL){ 9tc@   
  nHookCount++; C!/8e (!N  
  return TRUE; `i>B|g-  
 } ^?^|Y?f2P?  
 else  I^(o3B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); J\dhi{0  
  if(hHook!=NULL) 4G;`KqR@  
   nHookCount++; dS;|Kl[Om  
  return (hHook!=NULL); 4}_w4@(  
} H'= i  
BOOL UnInit() y/sWy1P7  
{ Y^*$PED?  
 if(nHookCount>1){ ,f /IG.  
  nHookCount--; ?j4,^K3  
  return TRUE; )oxP.K8q)U  
 } sei!9+bZr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bU4+P A@$  
 if(unhooked==TRUE){ "$:y03V  
  nHookCount=0; /?dQUu ^z  
  hHook=NULL; RY/ Z~]  
 } A Fm*60C  
 return unhooked; BE2\?q-  
} LN6JH!  
Mi/'4~0Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GLKN<2|2@y  
{ 5W]N]^v  
 BOOL bAdded=FALSE; f $@".  
 for(int index=0;index<MAX_KEY;index++){ rW%'M#! =  
  if(hCallWnd[index]==0){ ~tj7zI6  
   hCallWnd[index]=hWnd; P2:Q+j:PX  
   HotKey[index]=cKey; X"khuyT_  
   HotKeyMask[index]=cMask; \q`+  
   bAdded=TRUE; ?xTeio44  
   KeyCount++; >'1Q"$;  
   break; +!V%Q  
  }  DIu72\  
 } q!oZ; $  
 return bAdded; 4#7@KhK}  
} g`8 mh&u%  
dBq,O%$oq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h9n<ped`A;  
{ ?L#SnnE  
 BOOL bRemoved=FALSE; c{4nW|/W  
 for(int index=0;index<MAX_KEY;index++){ F=T.*-oS3  
  if(hCallWnd[index]==hWnd){ (b 2^d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pu)9"Ad[ G  
    hCallWnd[index]=NULL; BK\~I  
    HotKey[index]=0; "$"mWF-  
    HotKeyMask[index]=0; MVL }[J  
    bRemoved=TRUE; tA u|8aL  
    KeyCount--; B?YfOSF=5  
    break; "vRqtEBO@  
   } gMK3o8B/  
  } #/v_ h6$  
 } Tx?@* Q  
 return bRemoved; nPIR 1Z  
} 4!s k3Cw{  
e"H+sM26-  
void VerifyWindow() {)[g  
{ Umwg iw  
 for(int i=0;i<MAX_KEY;i++){ ;o@`l$O   
  if(hCallWnd!=NULL){ [c!vsh]^  
   if(!IsWindow(hCallWnd)){  iIEIGQx  
    hCallWnd=NULL; ~ V- o{IA  
    HotKey=0; }]GK@nn7  
    HotKeyMask=0; +p}Xmn  
    KeyCount--; "u]Fl+c  
   } 8}0y)aJ  
  } wG[l9)lz  
 } F5Q. Vh  
} kuud0VWJ  
adE0oXQH"  
BOOL CHookApp::InitInstance() Ay6rUN1ef  
{ IguG0 3:.N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @dKf]&h%%  
 hins=AfxGetInstanceHandle(); S_-mmzC(  
 InitHotkey(); 6)<oO(  
 return CWinApp::InitInstance(); -Izg&u &  
} jW$f(qAbm  
hgr ,v"  
int CHookApp::ExitInstance() $I0a2Z=dP  
{ W2(=m!:U  
 VerifyWindow(); z}N^`_ *  
 UnInit(); ~4` ec   
 return CWinApp::ExitInstance(); yWk:u 5  
} C)^\?DH  
h?tV>x/Fu  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {Om3fSk:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^g){)rz|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %LlKi5u]  
#if _MSC_VER > 1000 E :g ArQ  
#pragma once A"ph!* i{  
#endif // _MSC_VER > 1000 kRa$jD^?  
"m)O13x  
class CCaptureDlg : public CDialog .7Bav5 ;  
{ A_ z:^9  
 // Construction p 8Hv7*  
 public: Y tj>U  
  BOOL bTray; _r)nbQm&  
  BOOL bRegistered; 4IE#dwZW  
  BOOL RegisterHotkey(); )4~XZt1r  
  UCHAR cKey; Jpnp'  
  UCHAR cMask; Y k6WSurw  
  void DeleteIcon(); RXvcy<  
  void AddIcon(); H$iMP.AK  
  UINT nCount; (X'K)*G#  
  void SaveBmp(); }33Au-%*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .%h_W\M<l  
  // Dialog Data U]&%EqLS  
  //{{AFX_DATA(CCaptureDlg) ",GC\#^v  
  enum { IDD = IDD_CAPTURE_DIALOG }; mYRR==iDL  
  CComboBox m_Key; r~a}B.pj  
  BOOL m_bControl; [/^g) ^s:  
  BOOL m_bAlt; H t$%)j9  
  BOOL m_bShift; au~gJW-  
  CString m_Path; ArKrsI#H-  
  CString m_Number; zMg^2{0L  
  //}}AFX_DATA ~2 ;y4%K  
  // ClassWizard generated virtual function overrides Dp'af4+%$  
  //{{AFX_VIRTUAL(CCaptureDlg) ;b2>y>?[  
 public: Raqr VC  
  virtual BOOL PreTranslateMessage(MSG* pMsg); TU6EE  
 protected: ~a)2 0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r|$g((g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "d*  
  //}}AFX_VIRTUAL dQ o$^?  
  // Implementation ht!:e>z&4  
 protected: goWt!,&f  
  HICON m_hIcon; .SFwjriZ  
  // Generated message map functions R dzIb-  
  //{{AFX_MSG(CCaptureDlg) X,Q(W0-6$u  
  virtual BOOL OnInitDialog(); %j`]x -aOz  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); imuHSxcaV  
  afx_msg void OnPaint(); ~.SU$  
  afx_msg HCURSOR OnQueryDragIcon(); nW[aPQ[R   
  virtual void OnCancel(); +eat,3Ji  
  afx_msg void OnAbout();  %tjEVQa  
  afx_msg void OnBrowse(); Q'LU?>N)/  
  afx_msg void OnChange(); |0Kt@ AJY  
 //}}AFX_MSG +o5rR|)M+  
 DECLARE_MESSAGE_MAP()  KX@Fgs  
}; [)KfRk?};2  
#endif 32J  
r8E!-r}rno  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file LDNUywj@w  
#include "stdafx.h" &$ 9bC 't6  
#include "Capture.h" }0*7bb  
#include "CaptureDlg.h" a#@ opUn-  
#include <windowsx.h> |LhuZ_;1xo  
#pragma comment(lib,"hook.lib") V6o,}o&-  
#ifdef _DEBUG R'_[RHFC  
#define new DEBUG_NEW RAa1KOxZX  
#undef THIS_FILE -#hl& ^u$  
static char THIS_FILE[] = __FILE__; d@~)Wlje  
#endif #-8/|_*  
#define IDM_SHELL WM_USER+1 zoXF"Nz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EkPSG&6RZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R``qQ;cc  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; wjs7K|PK  
class CAboutDlg : public CDialog }\*|b@)]  
{ B!lw>rUMQ  
 public: .4-S|]/d,  
  CAboutDlg(); 4cL=f  
  // Dialog Data oWT0WS  
  //{{AFX_DATA(CAboutDlg) /$Jh5Bv  
  enum { IDD = IDD_ABOUTBOX }; e<pojb1Q  
  //}}AFX_DATA e&kg[jU  
  // ClassWizard generated virtual function overrides n+w>Qz'  
  //{{AFX_VIRTUAL(CAboutDlg) qyC"}y-  
 protected: [ ff.R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jKs8i$q  
  //}}AFX_VIRTUAL o! N@W  
  // Implementation *0tNun 5=3  
 protected: r>OE[C69  
  //{{AFX_MSG(CAboutDlg) 9)`wd&!  
  //}}AFX_MSG :\XD.n-n  
  DECLARE_MESSAGE_MAP() 6y5~Kh6  
}; UJ+JVj   
O\z%6:'M  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l,3tU|V  
{ uW|y8 BP $  
 //{{AFX_DATA_INIT(CAboutDlg) $1F9TfA  
 //}}AFX_DATA_INIT 4O'ho0w7  
} k3w#^ "i  
?2a gU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) C$ 5x*`y  
{ n1V*VQV  
 CDialog::DoDataExchange(pDX); $MR4jnTT  
 //{{AFX_DATA_MAP(CAboutDlg) :JmNy <  
 //}}AFX_DATA_MAP <7+.5iB3  
} e wR0e.g  
bL<cg tz7)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) sP#5l @  
 //{{AFX_MSG_MAP(CAboutDlg) *HUqW}_r  
 // No message handlers B:SRHd{*Wu  
 //}}AFX_MSG_MAP USY^ [@o[f  
END_MESSAGE_MAP() iQQJ`  
q^)(p' X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nDfDpP&  
: CDialog(CCaptureDlg::IDD, pParent) ?M);wBe(  
{ -b<+Ra  
 //{{AFX_DATA_INIT(CCaptureDlg) 1{qg@xlj  
  m_bControl = FALSE; %1<|.Dmd  
  m_bAlt = FALSE; +Y+kx"8  
  m_bShift = FALSE; H3b`)k sFr  
  m_Path = _T("c:\\"); "7d_$.Z  
  m_Number = _T("0 picture captured."); MH-,+-Eq  
  nCount=0; {1 mD(+pJ{  
  bRegistered=FALSE; n%}0hVu  
  bTray=FALSE; 7>TG ]&  
 //}}AFX_DATA_INIT ">7 bnOJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 A.Njn(z?Lz  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c s> W6  
} nN: i{t4f  
Gbhaibk O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )deuB5kz  
{ (uE_mEIsv  
 CDialog::DoDataExchange(pDX); 4?cg6WJ'6  
 //{{AFX_DATA_MAP(CCaptureDlg) f sMF46  
  DDX_Control(pDX, IDC_KEY, m_Key); uQ}kq7gd  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !{+(oDN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &^"m6  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u=5^xpI<D  
  DDX_Text(pDX, IDC_PATH, m_Path); k 'o?/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); `Bx CTwc  
 //}}AFX_DATA_MAP 4R.#=]F  
} )!Bv8&;e  
k K(,FB  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) e): &pqA  
//{{AFX_MSG_MAP(CCaptureDlg) ! d(,t[cV  
 ON_WM_SYSCOMMAND() mi+I)b=  
 ON_WM_PAINT() "&~Um U4CN  
 ON_WM_QUERYDRAGICON() GauIe0qV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (Qnn  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &7cy9Z~m  
 ON_BN_CLICKED(ID_CHANGE, OnChange) z]pH'c39  
//}}AFX_MSG_MAP #F kdcY  
END_MESSAGE_MAP() y}8j_r  
>A6lX)  
BOOL CCaptureDlg::OnInitDialog() 'k hJZ:  
{ L3S,*LnA  
 CDialog::OnInitDialog(); e |!i1e!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8Vp"}(Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); N gr7E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .Q7z<Q  
 if (pSysMenu != NULL) P<U{jkM\/  
 { eG<32$I  
  CString strAboutMenu; i4l?q#X  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6w' ^,V  
  if (!strAboutMenu.IsEmpty()) D0~mu{;c$  
  {  I2b[  
   pSysMenu->AppendMenu(MF_SEPARATOR); &WIPz\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9 HuE'(wQ  
  } #qzozQ4  
 } ^K8Ey#T  
 SetIcon(m_hIcon, TRUE); // Set big icon .- w*&Hd7b  
 SetIcon(m_hIcon, FALSE); // Set small icon e(b*T  
 m_Key.SetCurSel(0); VrHFM(RNe  
 RegisterHotkey(); Q%6*S!~  
 CMenu* pMenu=GetSystemMenu(FALSE); 0YKG`W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Gg/K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zKR_P{W>^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); z5?xmffB  
 return TRUE; // return TRUE unless you set the focus to a control U_+>4zdm  
} XWk^$"  
Xln'~5~)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \ /o`CV{O  
{ TMbj]Mso  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ) Limt<S  
 { =2< >dM#`  
  CAboutDlg dlgAbout; 75a3H`  
  dlgAbout.DoModal(); h_J 'dJS  
 } ,+f'%)s_x  
 else KV Mm<]Z  
 { m}k rG  
  CDialog::OnSysCommand(nID, lParam); Rh%x5RFFc  
 } P*_Q8I)Y  
} y'{0|Xj  
6j0!$q^  
void CCaptureDlg::OnPaint() 8[eH8m#~$  
{ cu |{cy-  
 if (IsIconic()) jGId)f!)  
 { 6B&':N98  
  CPaintDC dc(this); // device context for painting GSsot%B u"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~"8b\oLW  
  // Center icon in client rectangle i-$]Tg  
  int cxIcon = GetSystemMetrics(SM_CXICON); 60*=Bs%b  
  int cyIcon = GetSystemMetrics(SM_CYICON); l%U{Unwu  
  CRect rect; ) "'J]6  
  GetClientRect(&rect); }oU0J  
  int x = (rect.Width() - cxIcon + 1) / 2; 4Xlq Ym  
  int y = (rect.Height() - cyIcon + 1) / 2;  \:Q)Ef  
  // Draw the icon Y~,N,>nITu  
  dc.DrawIcon(x, y, m_hIcon); hl8[A-d(R  
 } zUWu5JI  
 else 8|gwH2 st~  
 { /K1YDq<=  
  CDialog::OnPaint(); v. !L:1@I.  
 } H_Vf _p?  
} v#F .FK  
XK>B mq/]  
HCURSOR CCaptureDlg::OnQueryDragIcon() {qK>A?9  
{ )D Y?Y-n  
 return (HCURSOR) m_hIcon; @xR=bWY  
} 074)(X&:x  
kLK}N>v}X  
void CCaptureDlg::OnCancel() VXQ~PF]z0  
{ Bf.@B0\  
 if(bTray) "4Cb dD//  
  DeleteIcon(); 40+~;20  
  CDialog::OnCancel(); (k4>I"x)  
} Q! WXFS  
J'W6NitMr  
void CCaptureDlg::OnAbout() ?!KqDI  
{ e~oI0%xl^  
 CAboutDlg dlg; wP29 xV"5  
 dlg.DoModal(); dL!PpLR$2  
}  s'RE~,  
XX+%:,G  
void CCaptureDlg::OnBrowse() KFx4"f%  
{ "{Lp'+wNw  
 CString str; q &#f#Ou  
 BROWSEINFO bi; pKMy:j  
 char name[MAX_PATH]; P`0}( '"U  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @uXF(KDX  
 bi.hwndOwner=GetSafeHwnd(); Yv\>\?865  
 bi.pszDisplayName=name; N$i!25F`  
 bi.lpszTitle="Select folder"; yP. ,Dh s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !/2u O5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); B*W)e$  
 if(idl==NULL) k "7l\;N  
  return; RG4T9eZq  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VG'M=O{)3  
 str.ReleaseBuffer(); e'Njl?>3  
 m_Path=str; ,t2Mur  
 if(str.GetAt(str.GetLength()-1)!='\\') yy8h8{=g  
  m_Path+="\\"; 8iQ8s;@S&>  
 UpdateData(FALSE); ap,%)on^  
} = wEU+R_#o  
_9*3Mr)2N  
void CCaptureDlg::SaveBmp() ^VabXGzo#  
{ h)7hk*I  
 CDC dc; =MMU(0 E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /{il;/Vj  
 CBitmap bm; dz_~_|  
 int Width=GetSystemMetrics(SM_CXSCREEN); H}vq2|MN  
 int Height=GetSystemMetrics(SM_CYSCREEN); SA!P:Q?h  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ()%NotN;  
 CDC tdc; ?QR13l(  
 tdc.CreateCompatibleDC(&dc); VEFUj&t;xW  
 CBitmap*pOld=tdc.SelectObject(&bm); PaIE=Q4gJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O(pa;&"  
 tdc.SelectObject(pOld); U~H]w ,^  
 BITMAP btm; {-a8^IK,  
 bm.GetBitmap(&btm); ;XAj/6pm  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 20h+^R3{Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); II;   
 BITMAPINFOHEADER bih; <l>o6K  
 bih.biBitCount=btm.bmBitsPixel; ?9W2wqN>o  
 bih.biClrImportant=0; J7a_a>Y  
 bih.biClrUsed=0; rW),xfo0  
 bih.biCompression=0; oQ YmywY  
 bih.biHeight=btm.bmHeight; [ H|ifi  
 bih.biPlanes=1; Oc A;+}>  
 bih.biSize=sizeof(BITMAPINFOHEADER); A43 mX !g\  
 bih.biSizeImage=size; 'wA4}f  
 bih.biWidth=btm.bmWidth; @ (4$<><  
 bih.biXPelsPerMeter=0; P~xP@? I%  
 bih.biYPelsPerMeter=0; ZE393FnE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,Kl6vw8Htg  
 static int filecount=0; ~!//|q^ J]  
 CString name; #u]'3en  
 name.Format("pict%04d.bmp",filecount++); 3pU/Z bb,:  
 name=m_Path+name; {&3{_Ml  
 BITMAPFILEHEADER bfh; :9?y-X  
 bfh.bfReserved1=bfh.bfReserved2=0; u?xXZ]_u-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L JW0UF|  
 bfh.bfSize=54+size; C[c^zn  
 bfh.bfOffBits=54; W[BwHNxyg  
 CFile bf; K-X@3&X}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q&\(m[:)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ku*H*o~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 'j&+Pg)@  
  bf.WriteHuge(lpData,size); ^(79SOZC  
  bf.Close(); V)q|U6R  
  nCount++; ip)gI&kN`z  
 } HnlCEW,^o  
 GlobalFreePtr(lpData); P80mK-Iyv_  
 if(nCount==1) 4C]>{osv  
  m_Number.Format("%d picture captured.",nCount); V;@kWE>3  
 else qE:/~Q0  
  m_Number.Format("%d pictures captured.",nCount); 8r{:d i*  
  UpdateData(FALSE); BU;o$"L  
} xryXO(  
y*oH"]D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Ng,< 4;  
{ qL;u59  
 if(pMsg -> message == WM_KEYDOWN) K (px-jY  
 { LWX,u  
  if(pMsg -> wParam == VK_ESCAPE) HE BKRpt  
   return TRUE; jVdRy{MH  
  if(pMsg -> wParam == VK_RETURN) ?mq<#/qb  
   return TRUE; d$ f3 Cre  
 } aWg*f*2f  
 return CDialog::PreTranslateMessage(pMsg); Z4VNm1qs  
} md S`nhb  
r P1FM1"M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zLt7jxx  
{ SN<Dxa8Iy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |K(j XZ)  
  SaveBmp(); fg?4/]*T6  
  return FALSE; <13').F  
} -h%!#g  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z\g6E/%%  
 CMenu pop; yb4Jsk5%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LFwRTY,G  
 CMenu*pMenu=pop.GetSubMenu(0); $_5a1Lq1  
 pMenu->SetDefaultItem(ID_EXITICON); D^-6=@<3KD  
 CPoint pt; [Z -S0  
 GetCursorPos(&pt); a@?2T,$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +-$Hx5  
 if(id==ID_EXITICON) ~[*\YN);  
  DeleteIcon(); yH<a;@C  
 else if(id==ID_EXIT) 4+1aW BJ2  
  OnCancel(); g#}a?kTM@  
 return FALSE; kklM"Av  
} qPH=2k ,H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); DMXm$PU4V  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V7}3H2]^  
 AddIcon(); qZ=%r u  
 return res; lk(.zYaaN  
} f#>ubmuI^  
5,~Ju>y*  
void CCaptureDlg::AddIcon() {];8jdg/?  
{ r5wy]z^  
 NOTIFYICONDATA data; vQ_D%f4;  
 data.cbSize=sizeof(NOTIFYICONDATA); Y(U+s\X  
 CString tip; ;;{!wA+"D  
 tip.LoadString(IDS_ICONTIP); azKiXr#_(  
 data.hIcon=GetIcon(0); j-}WA"  
 data.hWnd=GetSafeHwnd(); 77?D ~N[  
 strcpy(data.szTip,tip); 7#pu(:T$  
 data.uCallbackMessage=IDM_SHELL; aMq|xHZ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]IQ`.:g=9  
 data.uID=98; 3;-P(G@  
 Shell_NotifyIcon(NIM_ADD,&data); ]f}#&]<(T  
 ShowWindow(SW_HIDE); iD"9,1@~n  
 bTray=TRUE; .$~zxd#zo  
} jM07&o]D  
:=cZ,?PQp1  
void CCaptureDlg::DeleteIcon() c7~>uNgJ  
{ @w[2 BaDt  
 NOTIFYICONDATA data; drkY~!a  
 data.cbSize=sizeof(NOTIFYICONDATA); bw[s<z|LKA  
 data.hWnd=GetSafeHwnd(); ZNN^  
 data.uID=98; u|eV'-R)s  
 Shell_NotifyIcon(NIM_DELETE,&data); mh7JPbX|  
 ShowWindow(SW_SHOW); a`t <R  
 SetForegroundWindow(); *wu:fb2[(  
 ShowWindow(SW_SHOWNORMAL); !ma%Zk  
 bTray=FALSE; 8~@?cy1j!  
} 'Z{_w s  
8p0ZIrD%  
void CCaptureDlg::OnChange() G\4*6iw:  
{ l2|[  
 RegisterHotkey(); T=~D>2C  
} GUH-$rA  
lXnzomU  
BOOL CCaptureDlg::RegisterHotkey() sngM4ikhs  
{ Bkaupvv9S  
 UpdateData(); UZDXv=r|  
 UCHAR mask=0; ]8~{C>ch$  
 UCHAR key=0; Y Z.? k4>  
 if(m_bControl) "> ]{t[Ib  
  mask|=4; xC}9W6  
 if(m_bAlt) l.3|0lopX)  
  mask|=2; IMT]!j&Y,  
 if(m_bShift) q  W"  
  mask|=1; JIH6!  
  key=Key_Table[m_Key.GetCurSel()]; =Ul{#R z  
 if(bRegistered){ kS)azV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); yZc_PC`  
  bRegistered=FALSE; 0*{ 2^\  
 } *rH# k?  
 cMask=mask; ;GF+0~5>  
 cKey=key; o1^Rx5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $AyE6j_1gX  
 return bRegistered; b>]MZhLJe  
} X={Z5Xxr"  
w;=g$Bn  
  四、小结 *%p`Jk-U  
JQ"R%g` 8  
  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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