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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: ;^}cZ  
  :@_CQc*yB  
  一、实现方法 ~,R_  
ErB6fl  
  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: LLgN%!&  
ZH_ J+  
#pragma data_seg("shareddata") GOH@|2N  
HHOOK hHook =NULL; //钩子句柄 :Iwe>;}  
UINT nHookCount =0; //挂接的程序数目 XpOsnvW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d7Q. 'cyQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k6[t$|lMy  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <6p{eGAQV  
static int KeyCount =0; tDEpR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 sdS<-! %u4  
#pragma data_seg() W@"M/<r@/  
}}grJh>tGg  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 o1zc`Ibd  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: hpWAQ#%oHm  
|[!xLqG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 56?U4wj7{  
cKey,UCHAR cMask) ?\$77k  
{ axU!o /m>  
 BOOL bAdded=FALSE; .RJvu$U2j  
 for(int index=0;index<MAX_KEY;index++){ seAkOIc  
  if(hCallWnd[index]==0){ 7jts;H=  
   hCallWnd[index]=hWnd; EW2e k^  
   HotKey[index]=cKey; pPQ]#v  
   HotKeyMask[index]=cMask; PK3T@Qv89  
   bAdded=TRUE; 1Lj\"+.  
   KeyCount++; .fo.mC@a  
   break; :Oq!.uO  
  } +/Y )s5@<  
 } F;q I^{m2  
 return bAdded; L>@0Nne7  
} |C>Yd*E,C  
//删除热键 Vx* =  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Mqw&%dz'_  
{ puXJ:yo(  
 BOOL bRemoved=FALSE; "]MF =-v  
 for(int index=0;index<MAX_KEY;index++){ ]BAF  
  if(hCallWnd[index]==hWnd){ Ih,~h[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IHxX:a/iv  
    hCallWnd[index]=NULL; hC6$>tl  
    HotKey[index]=0; !7%L%~z^  
    HotKeyMask[index]=0; >2VB.f  
    bRemoved=TRUE; -pqShDar|  
    KeyCount--; JvHJ*E   
    break; /-BplU*"9  
   } PFEi=}Y@((  
  } a |z{B b  
 } qQpR gzw  
 return bRemoved; deeOtco$LT  
} 2d$hgR#v  
3)Paf`mr  
?]3`WJOj  
  DLL中的钩子函数如下: Z71"d"  
[eWB vAiW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H,H'bd/  
{ KbwWrf>  
 BOOL bProcessed=FALSE; pOH_ CXw  
 if(HC_ACTION==nCode) ]^Q`CiKd  
 { ;AG5WPI  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 aNXu"US+Sp  
   switch(wParam) |n6nRE wW  
   {  zD)2af  
    case VK_MENU: w #1l)+  
     MaskBits&=~ALTBIT; m! p'nP  
     break; dAAE2}e  
    case VK_CONTROL: ]MB ^0:F-  
     MaskBits&=~CTRLBIT; $,h*xb.  
     break; ]Ff&zBJ  
    case VK_SHIFT: 39m#  
     MaskBits&=~SHIFTBIT; TSuHY0. cp  
     break; O'idS`   
    default: //judge the key and send message MR+ndB<  
     break; C=hE@  
   } gCwg ;c-  
   for(int index=0;index<MAX_KEY;index++){ fMLm_5(H  
    if(hCallWnd[index]==NULL) \:" s*-  
     continue; WVwNjQ2PM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5RlJybN"o  
    { LClPAbr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); < ^J!*>  
     bProcessed=TRUE; zo]7#  
    } gQ/zk3?k  
   } JLg_oK6  
  } \h #vL  
  else if((lParam&0xc000ffff)==1){ //有键按下 QZ{:#iuig  
   switch(wParam) 0]NsT0M  
   { WJJ!No P  
    case VK_MENU: K<|eZhp~  
     MaskBits|=ALTBIT; S!g&&RDx  
     break; 0HG*KW  
    case VK_CONTROL: Q7#Q6-Q  
     MaskBits|=CTRLBIT; M)3h 4yQ  
     break; T]E$H, p  
    case VK_SHIFT: pGsVO5M?  
     MaskBits|=SHIFTBIT; ]HCt%5  
     break; ]`UJwq  
    default: //judge the key and send message Grw_SVa^  
     break; (>)Y0ki}  
   } $'[( DwLS  
   for(int index=0;index<MAX_KEY;index++){ 8qBw;A)  
    if(hCallWnd[index]==NULL) LY^BkH'  
     continue; ?mF-zA'4]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zHx?-Q&3  
    { &O!d!Pf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [!aHP ?-  
     bProcessed=TRUE; =#>P !  
    } s'5 jvlG  
   } wePMBL1P*  
  } :!aFfb["  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {`1zVTp[<  
   for(int index=0;index<MAX_KEY;index++){ {O!fV<Vx 9  
    if(hCallWnd[index]==NULL) n287@Y4Ru  
     continue; o]k[l ;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8@Y@5)Oc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 12k)Ek9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7GPBn}{W  
   } -|ee=BV  
  } ozGK -$  
 } !X#=Pt[,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I *}:C  
} cvc.-7IO  
_s=[z$EN&  
  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: "w|GIjE+  
e4?}#6RF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9]kWM]B)o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0ED(e1K#B  
&Cdd  
  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: p%,JWZ[  
/S|Pq!4<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7e u7ie6  
{ )|2g#hH5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xx41Qw>\W  
 { !m^WtF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9BHl 2<&V  
  SaveBmp(); ~omX(kPzK  
  return FALSE; WXGLo;+>I  
 } d)q{s(<;  
 …… //其它处理及默认处理 (+T|B E3*#  
} 3pl.<;9r  
m T\]  
JqFFI:Q5a  
  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。 R#Ss_y  
YMm Fpy  
  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。 ~sk 4v:-  
v`no dI  
  二、编程步骤 bC"#.e  
qzV:N8+,`  
  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"; o3%+FWrVTS  
u,/PJg-(!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i) :Q{[D  
_L&C4 <e'  
  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; YZ'gd10T  
j >P>MdZtk  
  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; GndF!#?N(  
<!4'?K-N  
  5、 添加代码,编译运行程序。 Vx?a&{3]-  
T4w`I;&v  
三、程序代码 _`ot||J  
cojuU=i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 'N'EC`R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #O`n Q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ opdi5 e)jK  
#if _MSC_VER > 1000 `"/@LUso  
#pragma once WM*7p;t@)  
#endif // _MSC_VER > 1000 {6v+ Dz>  
#ifndef __AFXWIN_H__ +d Ig&}Tr  
#error include 'stdafx.h' before including this file for PCH dt ;R  
#endif |P~TZ  
#include "resource.h" // main symbols s_p?3bKu  
class CHookApp : public CWinApp <C]s\ "o-`  
{ # l}Y1^PDd  
 public: vvdC.4O  
  CHookApp(); \vojF\  
  // Overrides -*+7-9A I  
  // ClassWizard generated virtual function overrides -:>Mi5/ s  
  //{{AFX_VIRTUAL(CHookApp) |Y2u=B  
 public: i>>_S&!9p  
  virtual BOOL InitInstance(); lYD-U8  
  virtual int ExitInstance(); mI?AI7DqK  
  //}}AFX_VIRTUAL ^%*%=LJm  
  //{{AFX_MSG(CHookApp) 0zdH6 &  
  // NOTE - the ClassWizard will add and remove member functions here. EXoT$Wt{$  
  // DO NOT EDIT what you see in these blocks of generated code ! VbJGyjx  
  //}}AFX_MSG n: Ka@  
  DECLARE_MESSAGE_MAP() AfFF u\  
}; aJK8G,Vk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4GeWo@8h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B]0`b1t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jQ(qaX&  
BOOL InitHotkey(); 0P&rTtU6  
BOOL UnInit(); Fdzs Wm  
#endif ( *UMpdj  
Pr<.ld\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Gpo(Zf?  
#include "stdafx.h" DMsxHAE1  
#include "hook.h" Mp}aJzmkB;  
#include <windowsx.h> iO>2#p8$NR  
#ifdef _DEBUG vRYfB{~  
#define new DEBUG_NEW pma'C\b>  
#undef THIS_FILE b~WiE?  
static char THIS_FILE[] = __FILE__; ggXg4~WL  
#endif M')f,5i&$  
#define MAX_KEY 100 '%l<33*  
#define CTRLBIT 0x04 josc  
#define ALTBIT 0x02 &X }GJLC3  
#define SHIFTBIT 0x01 G;>b}\Ng  
#pragma data_seg("shareddata") 3g0[( ;  
HHOOK hHook =NULL; 'UUIY$V[  
UINT nHookCount =0; Uf 1i "VY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Z9E[RD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q+ $+{g-8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .m9s+D]fI  
static int KeyCount =0; u|BD=4*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift xi %u)p  
#pragma data_seg() iLIH |P%  
HINSTANCE hins; Oc}4`?oy<O  
void VerifyWindow(); B>AmH%f/  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  ") q  
//{{AFX_MSG_MAP(CHookApp) g+bc4eU  
// NOTE - the ClassWizard will add and remove mapping macros here. -iLp3m<ai  
// DO NOT EDIT what you see in these blocks of generated code! /xUTm=w7u  
//}}AFX_MSG_MAP #/=s74.b  
END_MESSAGE_MAP() 5 <X.1 T1  
AvfSR p  
CHookApp::CHookApp() 'avzESe~'  
{ ABuK`(f.  
 // TODO: add construction code here, )*}2L_5]  
 // Place all significant initialization in InitInstance W|XW2`3p  
} 1MkQ$v7m  
UFr ]$m&  
CHookApp theApp; P-[6'mw`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jNd."[IrO  
{ %{?EfULg  
 BOOL bProcessed=FALSE; 5?9K%x'b  
 if(HC_ACTION==nCode) ,l+lokD-#  
 { 2K[Y|.u8>q  
  if((lParam&0xc0000000)==0xc0000000){// Key up >r J9^rS  
   switch(wParam) #e|G!'wdj  
   { >1q W*  
    case VK_MENU: ' 5`w5swbc  
     MaskBits&=~ALTBIT; MKMWHGN  
     break; $o2H#"  
    case VK_CONTROL: )(V|d$n  
     MaskBits&=~CTRLBIT; .K%1{`.|  
     break; Y_'3pX,  
    case VK_SHIFT: y:,Ro@H%  
     MaskBits&=~SHIFTBIT; zmaf@T  
     break; b/"&E'5-`\  
    default: //judge the key and send message +||y/}1  
     break; .{r0Szm.  
   } Z'=:Bo{  
   for(int index=0;index<MAX_KEY;index++){ E "9`  
    if(hCallWnd[index]==NULL) t,H=;U#  
     continue; ul@G{N{L   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IP<]a5  
    { w1>uD]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Lh`B5  
     bProcessed=TRUE; 3'3E:}o|  
    } f0Wbc\L[  
   } < KB V  
  } b&]_5 GGc  
  else if((lParam&0xc000ffff)==1){ //Key down PqUjBP\  
   switch(wParam) ^/c v8M=  
   { Hst]}g' .  
    case VK_MENU: k9Pwf"m|](  
     MaskBits|=ALTBIT; ZH<: g6  
     break; LeP;HP|  
    case VK_CONTROL: 5ub|r0&M  
     MaskBits|=CTRLBIT; >`{B  
     break; IZ2(F,{o  
    case VK_SHIFT: gdr"34%vbM  
     MaskBits|=SHIFTBIT; D_s0)|j$cy  
     break; SHcFnxEAIH  
    default: //judge the key and send message v^A4%e<8^r  
     break; @*>kOZ(3  
   } ]:"<if gp$  
   for(int index=0;index<MAX_KEY;index++) c2E*A+V#u  
   { -6KNMk   
    if(hCallWnd[index]==NULL)  Q{K '#  
     continue; ue8"_N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qz_'v{uAj  
    { F x 4s)(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G>@KX  
     bProcessed=TRUE; ^osXM`  
    } lq'MLg  
   } i$?$X,  
  } NpPuh9e{  
  if(!bProcessed){ uCB>".'kM  
   for(int index=0;index<MAX_KEY;index++){ > a?K ![R  
    if(hCallWnd[index]==NULL) 'zo] f  
     continue; <@4 48,9&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yw@kh^L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #Ch*a.tI@  
   } Ea,L04K  
  } I5%#A/|z  
 } qdCcMcGt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d8!yV~Ka  
} ;07>ZH%  
u5Tu~  
BOOL InitHotkey() Y W9+.Dc`  
{ P Y&(ObC  
 if(hHook!=NULL){ nDU=B.?E{O  
  nHookCount++; je#OV,uHM  
  return TRUE; m%s&$  
 } T1*%]6&V|  
 else Q1[3C(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y#<>N-X|kA  
  if(hHook!=NULL) ]. E/s(p  
   nHookCount++; p!Xn iY  
  return (hHook!=NULL); @,^c?v  
} zg>)Lq|VsT  
BOOL UnInit() +Y! P VMF  
{ ks|c'XQb  
 if(nHookCount>1){ .+ d.~jHX  
  nHookCount--; h1 npaD!  
  return TRUE; FGey%:p9$  
 } +5i~}Q!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T0e- X  
 if(unhooked==TRUE){ o|V`/sW{  
  nHookCount=0; [,0[\NC  
  hHook=NULL; dJ(<zz+;b  
 } j;yKL-ycB  
 return unhooked; X#Sgf|$  
} M/a40uK  
80GBkFjV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) : *8t,f~s^  
{ +R2+?v6  
 BOOL bAdded=FALSE;  P y!$r  
 for(int index=0;index<MAX_KEY;index++){ ^JM O POm  
  if(hCallWnd[index]==0){ RRUv_sff  
   hCallWnd[index]=hWnd; /e;E+   
   HotKey[index]=cKey; d=C&b]  
   HotKeyMask[index]=cMask; OPuty/^!Gw  
   bAdded=TRUE; ?1.W F}X'  
   KeyCount++; _Kwp8_kTr  
   break; =&t]R? F  
  } 6PyW(i(bs  
 } t2LX@Q"  
 return bAdded; tjg?zlj  
} gwyX%9  
85:KlBe%+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lx{ ' bzv  
{ z 4qEC  
 BOOL bRemoved=FALSE; ]4onY >  
 for(int index=0;index<MAX_KEY;index++){ 6L<QKE=  
  if(hCallWnd[index]==hWnd){ 25Uw\rKeO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #b9V&/ln  
    hCallWnd[index]=NULL; Oy_%U*  
    HotKey[index]=0; 9]%2Yb8SC  
    HotKeyMask[index]=0; 7{lWg x  
    bRemoved=TRUE; NjbIt=y  
    KeyCount--; %n^ugm0B  
    break; i`}!<{k  
   } 3Z}v%=5 "  
  } 0at['zw  
 } kgHZaQnD  
 return bRemoved; s`en8%  
} pIHpjx  
88KQ) NU  
void VerifyWindow() 3b?8<*  
{ f^)iv ]p  
 for(int i=0;i<MAX_KEY;i++){ qVW3oj<2  
  if(hCallWnd!=NULL){ z |8zNt Ug  
   if(!IsWindow(hCallWnd)){ [jR >.H'  
    hCallWnd=NULL; /?NfU.+K  
    HotKey=0; eD|"?@cE  
    HotKeyMask=0; O%f{\Fr  
    KeyCount--; T"3:dkQw  
   } w7c0jIf{  
  } &2nICAN[  
 } uO>pl37@  
} \M;cF "e-S  
"R\D:Olb#  
BOOL CHookApp::InitInstance() 'p[*2J"K4  
{ ^CK D[s  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *v$j n  
 hins=AfxGetInstanceHandle(); {:#c1d2@8  
 InitHotkey(); "E@A~<RKP  
 return CWinApp::InitInstance(); DzIV5FG  
} JS/~6'uB  
>a bp se  
int CHookApp::ExitInstance() 'Ck:=V%}g  
{ 55ft ,a  
 VerifyWindow(); ,$ Cr9R&/  
 UnInit(); DVt^O [  
 return CWinApp::ExitInstance(); J+T tM>  
} /9,y+"0SQz  
kjDmwa+91T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ++eT 0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d@tf+_Ih  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o;21|[z  
#if _MSC_VER > 1000 \E'z+0  
#pragma once 8|nc( $}~  
#endif // _MSC_VER > 1000 5j v*C]z  
7uf5w0]  
class CCaptureDlg : public CDialog T oT('  
{ 1p$*N  
 // Construction P$]K  
 public: lavy?tFer  
  BOOL bTray; IgRi(q^b-  
  BOOL bRegistered; x=-(p}0o;<  
  BOOL RegisterHotkey(); <g&.UW4  
  UCHAR cKey; ]E)D})r`#  
  UCHAR cMask; ~~O4!|t  
  void DeleteIcon(); f\r"7j  
  void AddIcon(); mM~&mAa+Z  
  UINT nCount; }57Jn5&'  
  void SaveBmp(); 3dJiu  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Vvp{y  
  // Dialog Data D2J)qCK1)  
  //{{AFX_DATA(CCaptureDlg) i3pOGa<  
  enum { IDD = IDD_CAPTURE_DIALOG }; `sA xk  
  CComboBox m_Key; KdD~;Ap$  
  BOOL m_bControl; ^/cqE[V~,  
  BOOL m_bAlt; [e_<UF@A*  
  BOOL m_bShift; .Yvy37n((  
  CString m_Path; zl|+YjR  
  CString m_Number; ;$8ptB.  
  //}}AFX_DATA Sy]W4%  
  // ClassWizard generated virtual function overrides JpZ_cb`<E'  
  //{{AFX_VIRTUAL(CCaptureDlg) x iz+ R9p  
 public: !? H:?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 4"\x#  
 protected: @$Yk#N;&(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !Pt4\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O9m sPb:  
  //}}AFX_VIRTUAL _ nz^+  
  // Implementation 7HQL^Q  
 protected: 6, |>;,U7  
  HICON m_hIcon; ! &cfX/y8  
  // Generated message map functions WncHgz  
  //{{AFX_MSG(CCaptureDlg) epG]$T![  
  virtual BOOL OnInitDialog(); OH@gwC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v;-0^s/P  
  afx_msg void OnPaint(); !vVW8hbp  
  afx_msg HCURSOR OnQueryDragIcon(); :fnJp9c  
  virtual void OnCancel(); :'xZF2  
  afx_msg void OnAbout();  DZ4gp  
  afx_msg void OnBrowse(); Dx=RLiU9  
  afx_msg void OnChange(); y+=s/c  
 //}}AFX_MSG T XT<6(  
 DECLARE_MESSAGE_MAP() &x=_n'  
}; L@jpid95  
#endif PW iuM=E  
'4D7:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  Hyenn  
#include "stdafx.h" he@Y1CY  
#include "Capture.h" Fe+(+ S  
#include "CaptureDlg.h" M+^ NF\  
#include <windowsx.h> LNrM`3%2-  
#pragma comment(lib,"hook.lib") O/$41mK+!  
#ifdef _DEBUG k {vd1,HZ  
#define new DEBUG_NEW XiV K4sD8  
#undef THIS_FILE U3-MvI,Q  
static char THIS_FILE[] = __FILE__; mey -Bn  
#endif +?*.Emzl@  
#define IDM_SHELL WM_USER+1 %rf6 >  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QFN9j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U%Hcc k'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g z uWhQo  
class CAboutDlg : public CDialog #c"05/=A  
{ &j/,8 Z*  
 public: gNZ"Kr o6  
  CAboutDlg(); 6' \M:'<0e  
  // Dialog Data qF-Fc q  
  //{{AFX_DATA(CAboutDlg) !>wu7u-  
  enum { IDD = IDD_ABOUTBOX }; lPC{R k.\C  
  //}}AFX_DATA +W$uHQq  
  // ClassWizard generated virtual function overrides 0F6@aQ\y3  
  //{{AFX_VIRTUAL(CAboutDlg) S$P=;#r  
 protected: wlh%{l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +z#+}'mT%  
  //}}AFX_VIRTUAL n=0^8QQ  
  // Implementation 4PR&67|AH_  
 protected: m;IKV,  
  //{{AFX_MSG(CAboutDlg) ACFEM9 [=  
  //}}AFX_MSG &oJ[ *pQ  
  DECLARE_MESSAGE_MAP() cRCji^,KJ  
}; 0R0_UvsXU  
iAPGP -<6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %U .x9UL  
{ M\Wg|gpy  
 //{{AFX_DATA_INIT(CAboutDlg) 2#CN:b]+  
 //}}AFX_DATA_INIT hYA1N&yz@  
} L$ ^ew0C  
/}%C'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9Uz2j$p7  
{ :xO43z  
 CDialog::DoDataExchange(pDX); 7|[Dr@.S  
 //{{AFX_DATA_MAP(CAboutDlg) &$#NV@  
 //}}AFX_DATA_MAP $RHw6*COG  
} 4(Y-TFaf  
[iyhrc:@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hh.`Yu L  
 //{{AFX_MSG_MAP(CAboutDlg) naeppBo  
 // No message handlers B[f:T%  
 //}}AFX_MSG_MAP }XRfHQk  
END_MESSAGE_MAP() ]/%CTD(O  
5g'aNkF6>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Xg;<?g?k  
: CDialog(CCaptureDlg::IDD, pParent) N>g6KgX{K  
{ `d x.<R#,  
 //{{AFX_DATA_INIT(CCaptureDlg) 63t'|9^5  
  m_bControl = FALSE; })q8{Qj!  
  m_bAlt = FALSE; sebm  
  m_bShift = FALSE; AvuGAlP  
  m_Path = _T("c:\\"); - s{&_]A~  
  m_Number = _T("0 picture captured."); _?bF;R  
  nCount=0; 6$csFW3R  
  bRegistered=FALSE; m (kKUv  
  bTray=FALSE; o_ixdnc  
 //}}AFX_DATA_INIT Z^KWYe'w  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iRv \:.aQ.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )o&}i3~Q  
} C [8='i26  
]*{tno  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) w'mn O'%  
{ I Vw'YtZ  
 CDialog::DoDataExchange(pDX); ;jlI>;C;V  
 //{{AFX_DATA_MAP(CCaptureDlg) k4"O} jQO  
  DDX_Control(pDX, IDC_KEY, m_Key); )G#O#Yy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xP'"!d4^i  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K2tOt7M!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )Oj{x0{\Q  
  DDX_Text(pDX, IDC_PATH, m_Path); A{DE7gp!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WxtB:7J  
 //}}AFX_DATA_MAP 1ZWr@,\L  
} P Qi=  
? 8S~R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NnY+=#j7L  
//{{AFX_MSG_MAP(CCaptureDlg) ^X:g C9  
 ON_WM_SYSCOMMAND() sB'~=1m^  
 ON_WM_PAINT() -8t&&fIA  
 ON_WM_QUERYDRAGICON() x!?$y_t  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h]o{> |d9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) uC 2{ Mmy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =~k#<q1^  
//}}AFX_MSG_MAP -{$L`{|G  
END_MESSAGE_MAP() 4zqO!nk  
% +M,FgW  
BOOL CCaptureDlg::OnInitDialog() {9nH#yv  
{ j$z!kd+%  
 CDialog::OnInitDialog(); OX{2@+f#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (;++a9GK  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q\2~^w1V  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *p^*>~i9)  
 if (pSysMenu != NULL) &W>%E!F  
 { .;;:t0PB  
  CString strAboutMenu; cN]g^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); mGc i >)2  
  if (!strAboutMenu.IsEmpty()) Twk,R. O  
  { wD $sKd  
   pSysMenu->AppendMenu(MF_SEPARATOR); -JXCO <~k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -1]8f  
  } "> Y(0^^  
 } JP6+h>ft  
 SetIcon(m_hIcon, TRUE); // Set big icon T<u QhPMw  
 SetIcon(m_hIcon, FALSE); // Set small icon SbD B[O%  
 m_Key.SetCurSel(0); p</V_BIW  
 RegisterHotkey(); `4t*H>:y  
 CMenu* pMenu=GetSystemMenu(FALSE);  dm{/  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); o/I`L  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `"eIzLc%o6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); e]3b0`E  
 return TRUE; // return TRUE unless you set the focus to a control 9S<at MB  
} h@D!/PS  
ac/<N%  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Hni?r!8r  
{ @-aMj  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ::p(ViYG  
 { )'axJ  
  CAboutDlg dlgAbout; L9,O,f  
  dlgAbout.DoModal(); <P pW.1w  
 } eq7>-Dmi@  
 else ?;CMsO*q  
 { rLI );!^-  
  CDialog::OnSysCommand(nID, lParam); })5I/   
 } Aiqn6BX{  
} &&`-A6`p  
M I R))j;  
void CCaptureDlg::OnPaint() >1NE6T  
{ >vfbXnN  
 if (IsIconic()) p JM&R<i:  
 { L(_bf/ @3  
  CPaintDC dc(this); // device context for painting {7LNQGiJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~zL DLr=  
  // Center icon in client rectangle t4r%EP|Zt  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7uxUqM  
  int cyIcon = GetSystemMetrics(SM_CYICON); \EQCR[7qu7  
  CRect rect; =4:]V\o):'  
  GetClientRect(&rect); m 9.BU2.  
  int x = (rect.Width() - cxIcon + 1) / 2; ko`.nSZ-k  
  int y = (rect.Height() - cyIcon + 1) / 2; ,?`Zrxe[  
  // Draw the icon |,WP)  
  dc.DrawIcon(x, y, m_hIcon); cxn*!TwDs  
 } %p8#pt\$7  
 else G"nGaFT~  
 { noQS bI @  
  CDialog::OnPaint(); e&ci\x%  
 } V D.T=(  
} xw~3x*{  
b!c2j   
HCURSOR CCaptureDlg::OnQueryDragIcon() y5`$Aa4~  
{ bDT@E,cSi  
 return (HCURSOR) m_hIcon; HCZVvsG  
} 4s7&*dJ  
ID8u&:  
void CCaptureDlg::OnCancel() ((mR' A|`  
{ Ula h!s  
 if(bTray) ,<!v!~Iy  
  DeleteIcon(); c, FZ{O@  
  CDialog::OnCancel(); Ktn:6=,  
} .1A/hAdU  
ND\M  
void CCaptureDlg::OnAbout() U~q2j#pJ  
{ H_d^Xk QZ  
 CAboutDlg dlg; BY`vs+]XY  
 dlg.DoModal(); /<T3^/ '  
} 0Q!/A5z  
kB-]SD#  
void CCaptureDlg::OnBrowse() J *;= f8  
{ >Q[3t79^  
 CString str; 1Ms_2  
 BROWSEINFO bi; T*jQzcm~?  
 char name[MAX_PATH]; i2l/y,UX  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); k\KI#.>  
 bi.hwndOwner=GetSafeHwnd(); XS=f>e1<W  
 bi.pszDisplayName=name; ^50\c$  
 bi.lpszTitle="Select folder"; ^"] ]rZ)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; PM`iqn)@  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =[nuesP'  
 if(idl==NULL) j] J-#J  
  return; x,LY fy"0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fxknfgbg  
 str.ReleaseBuffer(); t_w2J=2  
 m_Path=str; +,T z +!  
 if(str.GetAt(str.GetLength()-1)!='\\') /Csk"IfuO  
  m_Path+="\\"; q0L\{  
 UpdateData(FALSE); t 09-y  
} K@tELYb  
9xaieR  
void CCaptureDlg::SaveBmp() <kKuis6h  
{ I+W:}}"j  
 CDC dc; W<>R;~)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y 'Ah*h  
 CBitmap bm; NK6 ~qWsu  
 int Width=GetSystemMetrics(SM_CXSCREEN); @]7s`?  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5Zn:$?7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); OM?FpRVU8  
 CDC tdc; \1<8'at  
 tdc.CreateCompatibleDC(&dc); sq{=TB{  
 CBitmap*pOld=tdc.SelectObject(&bm); oc;4;A-;`c  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T'!p{Fbg;  
 tdc.SelectObject(pOld); 8(g}/%1mt3  
 BITMAP btm; $},_O8R  
 bm.GetBitmap(&btm); KzQuLD(e  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  lofP$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~DP5Qi  
 BITMAPINFOHEADER bih; GD% qrK?  
 bih.biBitCount=btm.bmBitsPixel; `*3;sq%`  
 bih.biClrImportant=0; v^aI+p6  
 bih.biClrUsed=0; 'm0_pM1:D  
 bih.biCompression=0; +]p/.- Uw  
 bih.biHeight=btm.bmHeight; T%4yPmY  
 bih.biPlanes=1; F},kfCFF  
 bih.biSize=sizeof(BITMAPINFOHEADER); r4Xaa<  
 bih.biSizeImage=size; SB,#y>Zv?  
 bih.biWidth=btm.bmWidth; !m8T< LtMl  
 bih.biXPelsPerMeter=0; Ml6}47n  
 bih.biYPelsPerMeter=0; Cz6bD$5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e!vWGnY  
 static int filecount=0; gfiFRwC`v  
 CString name; ;@qQ^!g2  
 name.Format("pict%04d.bmp",filecount++); 1BSn#Dnj  
 name=m_Path+name; ET(/h/r  
 BITMAPFILEHEADER bfh; ZEs^b  
 bfh.bfReserved1=bfh.bfReserved2=0; WO$8j2!~#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ']N\y6=fn9  
 bfh.bfSize=54+size; 2M)E1q|a  
 bfh.bfOffBits=54; 4kR;K !@k  
 CFile bf; 5?.!A 'zb  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :XOjS[wBm  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OZ/"W)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3zv0Nwb,  
  bf.WriteHuge(lpData,size); f|Nkk*9$  
  bf.Close(); DABV}@K"  
  nCount++; }\1V%c  
 } S<z8  
 GlobalFreePtr(lpData); &%tW  
 if(nCount==1) jOZ>^5}  
  m_Number.Format("%d picture captured.",nCount); xl Q]"sm1  
 else !&5|:96o  
  m_Number.Format("%d pictures captured.",nCount); Y=,9M  
  UpdateData(FALSE); VVfTFi<  
} u Yc}eMb  
?rziKT5OOC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Jl|^^?  
{ _ Td#C1g3  
 if(pMsg -> message == WM_KEYDOWN) c *i,z  
 { T8^l}Y B  
  if(pMsg -> wParam == VK_ESCAPE) js!C`]1  
   return TRUE; > w SI0N  
  if(pMsg -> wParam == VK_RETURN) IFW7MF9V  
   return TRUE; 9A87vs4[  
 } V9cj  
 return CDialog::PreTranslateMessage(pMsg); ;zd.KaS  
} zjSHa'9*  
@'y8* _  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) At !@Rc  
{ M"-.D;sa1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >_$_fB  
  SaveBmp(); TaF;P GjVw  
  return FALSE; B~b ='jN  
} 2*] [M,L0c  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yCkX+{ki  
 CMenu pop; G-,0mo  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wO6>jW 7  
 CMenu*pMenu=pop.GetSubMenu(0); L-zU%`1{M  
 pMenu->SetDefaultItem(ID_EXITICON); h 92KU  
 CPoint pt; u|k_OUTq  
 GetCursorPos(&pt); nzF2Waa-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1H-~+lf  
 if(id==ID_EXITICON) 1=e(g#Ajn\  
  DeleteIcon(); 8~T=p:z'  
 else if(id==ID_EXIT) 5 0a';!H  
  OnCancel(); ;=1[D  
 return FALSE; [.w`r>kZI  
} ='@ k>Ka+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); SLp nVD:'1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )1$H 7|  
 AddIcon(); =#A/d `2 b  
 return res; FYb]9MX  
} lkC|g%f  
`wr*@/P  
void CCaptureDlg::AddIcon() j?g#8L;W\w  
{ P + C5 s  
 NOTIFYICONDATA data; I3}]MAE  
 data.cbSize=sizeof(NOTIFYICONDATA); n xR\tBv  
 CString tip; G:` So  
 tip.LoadString(IDS_ICONTIP); m=Mk@xfQ#  
 data.hIcon=GetIcon(0); jhBfy|Ftu  
 data.hWnd=GetSafeHwnd(); P>$+XrTE  
 strcpy(data.szTip,tip); 4vND ~9d  
 data.uCallbackMessage=IDM_SHELL; ]z| 2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /LtbmV  
 data.uID=98; )-Z*/uF^  
 Shell_NotifyIcon(NIM_ADD,&data); }5}>B *  
 ShowWindow(SW_HIDE); rq\<zx]au  
 bTray=TRUE; hS>=p O+y  
} 66$ hdT$  
@ScC32X  
void CCaptureDlg::DeleteIcon() &JD^\+7U:  
{ +_QcLuV,  
 NOTIFYICONDATA data; UIU6rilB  
 data.cbSize=sizeof(NOTIFYICONDATA); 52^,qP'6  
 data.hWnd=GetSafeHwnd(); T)Q_dF.N  
 data.uID=98; ; 7QG]JX  
 Shell_NotifyIcon(NIM_DELETE,&data); G({VK  
 ShowWindow(SW_SHOW); IWI$@dng6  
 SetForegroundWindow(); ?FEh9l)d\  
 ShowWindow(SW_SHOWNORMAL); WP=uHg  
 bTray=FALSE; oa[O~z{~  
} %b~ND?nn-  
@\>7 wt_'  
void CCaptureDlg::OnChange() NLUO{'uUW  
{ 6E(..fo:"  
 RegisterHotkey(); Rm6i[y&  
} 4vkqe6  
H6Gs&yk3  
BOOL CCaptureDlg::RegisterHotkey() gA3f@7}d  
{ {XD':2E  
 UpdateData(); ?crK613 t  
 UCHAR mask=0; C)UU/4a;  
 UCHAR key=0; qv4r !x  
 if(m_bControl) -3 "<znv  
  mask|=4; $Il  
 if(m_bAlt) 7s;;2<k;_  
  mask|=2; B@ ms Gb C  
 if(m_bShift) Dd-a*6|x  
  mask|=1; NgF"1E  
  key=Key_Table[m_Key.GetCurSel()]; &5[+p{2  
 if(bRegistered){ kpNp}b8']  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); P8;1,?ou  
  bRegistered=FALSE; uc|ej9N  
 } 0O-"tP8o  
 cMask=mask; $D D esy3  
 cKey=key; $Zkk14  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rhly.f7N=A  
 return bRegistered; {+3g*s/HI  
} (.L?sDQ</z  
] ;CJ6gM~  
  四、小结 _A0X[}^K  
MD3iWgM  
  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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