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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: g{K*EL <  
  C?6wIdp  
  一、实现方法 a4HUP*  
S]3K5Z|  
  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: #({0HFSC:j  
ZuIr=`"j  
#pragma data_seg("shareddata") Vae}:8'}  
HHOOK hHook =NULL; //钩子句柄 Pg[XIfBva  
UINT nHookCount =0; //挂接的程序数目 ZdbZ^DUR<(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4%L`~J4 wr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 * ^R?*vNs  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -r%4,4  
static int KeyCount =0; XO sPKq  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A[QUFk(  
#pragma data_seg() 6Yw;@w\  
cVjs-Xf7D%  
  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。 FncK#hZ.  
*?'nA{a)E  
  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: A&%vog]O  
dh r)ra]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR < GoUth.#  
cKey,UCHAR cMask) 5Vo8z8]t`  
{ 8,\toT7  
 BOOL bAdded=FALSE; hM~9p{O  
 for(int index=0;index<MAX_KEY;index++){ 2pR+2p`  
  if(hCallWnd[index]==0){ `I|$U)'  
   hCallWnd[index]=hWnd; (V2~txMh  
   HotKey[index]=cKey; K=|x"6\  
   HotKeyMask[index]=cMask; e1$T%?(&[  
   bAdded=TRUE; E.V#Bk=  
   KeyCount++; 5yPw[ EY  
   break; bup)cX^  
  } Db"jzMW.  
 } _ ;baZ-  
 return bAdded; O iRhp(  
} f9FJ:?  
//删除热键 &'{6_-kh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =6FA(R|QU  
{ z~b5K\/1B  
 BOOL bRemoved=FALSE; ^IgxzGD  
 for(int index=0;index<MAX_KEY;index++){ A1Tk6i<F1  
  if(hCallWnd[index]==hWnd){ eUP.:(E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nrqr p  
    hCallWnd[index]=NULL; F_>OpT  
    HotKey[index]=0; J3Ipk-'lx  
    HotKeyMask[index]=0; 64]_o/u5W4  
    bRemoved=TRUE; F+yu[Dh:  
    KeyCount--; O$ dz=)  
    break; DC?U +  
   } u#9H  
  } tkT:5O6  
 } zN2CI6  
 return bRemoved; 5>z`==N)  
} 8nzDLFxp_  
m-V_J`9"  
HCOv<k  
  DLL中的钩子函数如下: Nn/me  
)b^yAzL?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1F`1(MYt9  
{ {4B{~Qe;  
 BOOL bProcessed=FALSE; CUIFKM  
 if(HC_ACTION==nCode) +<#0V!DM  
 { Zy !^HS$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (jj=CLe  
   switch(wParam) sfb)iH|sW  
   {  "^/3?W>  
    case VK_MENU: U^aMh-  
     MaskBits&=~ALTBIT; 7p"4rL  
     break; '3B"@^]  
    case VK_CONTROL: ft |W  
     MaskBits&=~CTRLBIT; alr'If@7  
     break; .g Z1}2GF=  
    case VK_SHIFT: yU ?TdM\  
     MaskBits&=~SHIFTBIT; mn5y]:;`  
     break; 0\W6X;?  
    default: //judge the key and send message A7 U]wW9  
     break; g!/O)X3  
   } Ife/:v  
   for(int index=0;index<MAX_KEY;index++){ D==C"}J  
    if(hCallWnd[index]==NULL) 6ZvGD}/  
     continue; v#/k`x\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l1_hD ,4  
    { {lv@V*_Y0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jU~q~e7Te  
     bProcessed=TRUE; ,O`a_b]  
    } K+HP2|#6  
   } )DR/Xu;b  
  } <L!9as]w  
  else if((lParam&0xc000ffff)==1){ //有键按下 d@d\9*mn  
   switch(wParam) _]oNbcbt(  
   { {,:yZ&(  
    case VK_MENU: = Ob-'Syg>  
     MaskBits|=ALTBIT; `i~kW  
     break; o8uak*"{  
    case VK_CONTROL: \0)v5u  
     MaskBits|=CTRLBIT; r Uau? ?  
     break; =}F}XSvXH  
    case VK_SHIFT: <V} ec1  
     MaskBits|=SHIFTBIT; ,,}& Q%5  
     break; l~mC$>f  
    default: //judge the key and send message eMHBY6<~=  
     break; $U*b;'o  
   } Pp{Re|.  
   for(int index=0;index<MAX_KEY;index++){ KE$I!$zO  
    if(hCallWnd[index]==NULL) 9(-f)$u  
     continue; ~<Eu @8+_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t=(d, kf  
    { &9j*Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eDkJ+5b  
     bProcessed=TRUE; :{ 8,O-  
    } C-2{<$2k  
   } YY4XCkt  
  } =lb5 #  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }Od=WQv+  
   for(int index=0;index<MAX_KEY;index++){ #(Xv\OE  
    if(hCallWnd[index]==NULL) AHB_[i'>7  
     continue; z^,P2kqK_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %fJ~ 3mu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !c2<-3e  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 O su 75@3  
   } $^K12Wcp-  
  } lVptA3F  
 } ;Q.'u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _keI0ML-#  
} 8x~'fzf;Sq  
.]XBJc  
  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: f%[0}.wp  
U;w| =vM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (fqU73  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q1Sr#h|  
dy"7Wl]hi7  
  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: 9EFQo^ E  
o;[cApiQ,2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qu`F,OG  
{ r]3v.GZy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]H-5    
 { (F+]h]KSi  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9O4\DRe5c  
  SaveBmp(); |s!<vvp]  
  return FALSE; 16-1&WuY@  
 } Z,_EhEm  
 …… //其它处理及默认处理 Y 8Dn&W  
} nvInq2T 1  
]^>RBegJBO  
\Dx5=Lh  
  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。 GeFu_7u!|  
;659E_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。 hd>_K*oH  
%|(Cb!ySX  
  二、编程步骤 =38c}(  
p!/ *(TT  
  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"; .VA'W16  
KN< KZM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ecdM+kP  
&=[N{N?(  
  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; ?m bI6fYv  
*r/o \pyH  
  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; SO+J5,)HA  
.22}= z  
  5、 添加代码,编译运行程序。 'GF<_3I2l  
"ivSpec.V  
三、程序代码 ]N^>>k  
0f;`Zj0l8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL R^VmNj  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ae8P'FWB>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z}`A'#!  
#if _MSC_VER > 1000 rCsH 0:l8P  
#pragma once M?v`C>j  
#endif // _MSC_VER > 1000 wDt9Lf O  
#ifndef __AFXWIN_H__ 82P#C4c+d  
#error include 'stdafx.h' before including this file for PCH fq(3uE]nC  
#endif g0 k{b  
#include "resource.h" // main symbols rd ]dD G  
class CHookApp : public CWinApp .2f0e[J  
{  q^Ui2  
 public: g{e@I;F  
  CHookApp(); %df[8eX{  
  // Overrides >>.4@  
  // ClassWizard generated virtual function overrides #gSIa6z1W  
  //{{AFX_VIRTUAL(CHookApp) 9xRor<  
 public: {1}p+dEK  
  virtual BOOL InitInstance(); f^[u70c82  
  virtual int ExitInstance(); w)<h$ <tU  
  //}}AFX_VIRTUAL '/GZ/$a_l  
  //{{AFX_MSG(CHookApp) ia*Bcx_RW+  
  // NOTE - the ClassWizard will add and remove member functions here. h,x'-]q  
  // DO NOT EDIT what you see in these blocks of generated code ! O[5u6heNMr  
  //}}AFX_MSG JL=s=9N;3  
  DECLARE_MESSAGE_MAP() &\5%C\0Z<  
}; A)HV#T`N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;@/vKA3l.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Lw<%?F (  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iX6'3\Q3A  
BOOL InitHotkey(); #vPf$y6jCI  
BOOL UnInit(); 8C4v  
#endif m%.7l8vT  
UEH+E&BCC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^~DClZ  
#include "stdafx.h" X+'B*K$  
#include "hook.h" /9<62F@zJ"  
#include <windowsx.h> WV,j <x9w  
#ifdef _DEBUG ]-8yZWal  
#define new DEBUG_NEW 7b hJt_`Q  
#undef THIS_FILE $@eFSA5k,7  
static char THIS_FILE[] = __FILE__; ^2eH0O!  
#endif Yg! xlrxA  
#define MAX_KEY 100 K&;;{~md.  
#define CTRLBIT 0x04 ]GmXZi  
#define ALTBIT 0x02 j9 O"!9$vQ  
#define SHIFTBIT 0x01 T?EFY}f  
#pragma data_seg("shareddata") tS sDW!!M  
HHOOK hHook =NULL; *:,y`!F=y  
UINT nHookCount =0; _Bq[c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey q:3HU<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT lk%W2N5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /F_(&H!m  
static int KeyCount =0; q":0\ar&QT  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T UO*w  
#pragma data_seg() ]oE:p  
HINSTANCE hins; B+n(K+  
void VerifyWindow(); 89l{h8R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T]y^PT<8?  
//{{AFX_MSG_MAP(CHookApp) C^9bur/  
// NOTE - the ClassWizard will add and remove mapping macros here. `t Zw(Z=h  
// DO NOT EDIT what you see in these blocks of generated code! }Oe9Zq  
//}}AFX_MSG_MAP tRmH6  
END_MESSAGE_MAP() ^<v]x; 3  
gB}UzEj^<  
CHookApp::CHookApp() $LJCup,1"  
{ b:YyzOqEu  
 // TODO: add construction code here, #RVN 7-x  
 // Place all significant initialization in InitInstance vF .Ml  
} .Eg[[K_iD  
"V:E BR  
CHookApp theApp; 1ZRSeh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ['\ u?m  
{ PP!} w  
 BOOL bProcessed=FALSE; mqKr+  
 if(HC_ACTION==nCode) ZfSAXr "(  
 { z|WDqB%/I  
  if((lParam&0xc0000000)==0xc0000000){// Key up Nh+ZSV4WJ:  
   switch(wParam) 4<l&cP  
   { p WLFJH}N  
    case VK_MENU: Ukg iSv+  
     MaskBits&=~ALTBIT; /+{1;}AT  
     break; O>Ao#_*hOb  
    case VK_CONTROL: +EP=uV9t  
     MaskBits&=~CTRLBIT; > @n?W"  
     break; )+v' @]r  
    case VK_SHIFT: { , zg  
     MaskBits&=~SHIFTBIT; ;&U! g&  
     break; 1`l10fqU  
    default: //judge the key and send message WoX,F1o  
     break; ~JSa]6:_+  
   } i~;Yrc%AEX  
   for(int index=0;index<MAX_KEY;index++){ <|c[ #f  
    if(hCallWnd[index]==NULL) r^$WX@ t&  
     continue; $ZfoJR]%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UWW_[dJr   
    { hwB>@r2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M$+2f.(>k)  
     bProcessed=TRUE; Y|y X]\,  
    } B4ky%gF4  
   } 8jm\/?k|  
  } M,/{53  
  else if((lParam&0xc000ffff)==1){ //Key down =3<@{^Eg  
   switch(wParam) N[8y+2SZ  
   { [" nDw<U  
    case VK_MENU: ?R\:6x<  
     MaskBits|=ALTBIT; ]Q*eCt;l"K  
     break; dRPX`%J  
    case VK_CONTROL: &~a/Upz0]_  
     MaskBits|=CTRLBIT; u|uPvbM  
     break; (H-Y-Lk+  
    case VK_SHIFT: KvfZj  
     MaskBits|=SHIFTBIT; $][$ e  
     break; QP0[  
    default: //judge the key and send message " H; i Av  
     break; +Rb0:r>kU  
   } aIW W[xZ  
   for(int index=0;index<MAX_KEY;index++) P},d`4Ty@  
   { {fAj*,pzl  
    if(hCallWnd[index]==NULL) 4KCJ(<p|  
     continue; Ceco^Mw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (b4;c=<[{  
    { 4.}J'3 .  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z 8\;XR  
     bProcessed=TRUE; Ss c3uo0  
    } U2)y fhI  
   } >Pw ZHY  
  } \`$RY')9|!  
  if(!bProcessed){ sCw X|  
   for(int index=0;index<MAX_KEY;index++){ R6/vhze4L2  
    if(hCallWnd[index]==NULL) 'q9='TOk  
     continue; 990sE t?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K^fH:pV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -+w^"RBV  
   } XVNJ3/  
  } GO=3<Q{;  
 } )OgQ&,#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PDH00(#;+  
} 6m!%X GZ T  
N0 F|r8xS  
BOOL InitHotkey() !JE=QG"  
{ qD?-&>dBWi  
 if(hHook!=NULL){ <4QOjW  
  nHookCount++;  T%p/(  
  return TRUE; )i{B:w\ ^  
 } 35X4] t  
 else >7^i>si  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |)\{Rufb  
  if(hHook!=NULL) 4_B1qN  
   nHookCount++; BO 3%p  
  return (hHook!=NULL); Lavm  
} Q'n]+%YN  
BOOL UnInit() !mtq?LV  
{ XexslzI  
 if(nHookCount>1){ PK7 kpC  
  nHookCount--; %.3] F2_Q  
  return TRUE; _]~= Kjp  
 } jQLiqi`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c _faW  
 if(unhooked==TRUE){ "Ooc;xD3<  
  nHookCount=0; (aa}0r5  
  hHook=NULL; Wu9))Ir  
 } 3Az7urIY  
 return unhooked; !1s^TB>N  
} Rh.CnCbM  
5,n{-V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m:A1wL4c6  
{ hB:}0@l6p=  
 BOOL bAdded=FALSE; 9V5d=^  
 for(int index=0;index<MAX_KEY;index++){ K)d]3V!  
  if(hCallWnd[index]==0){ U`h>[9  
   hCallWnd[index]=hWnd; b08s610fk  
   HotKey[index]=cKey; x!@P|c1nKC  
   HotKeyMask[index]=cMask; "/MA.zEl0,  
   bAdded=TRUE; v1Wz#oP  
   KeyCount++; 1 6N+  
   break; WMw]W&  
  } 4`Z8EV  
 } |-SImxV  
 return bAdded; CYCG5)<9  
} L[s8`0  
KnjowK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4v("qNw#  
{ "\l O1D  
 BOOL bRemoved=FALSE; RN0=jo!58  
 for(int index=0;index<MAX_KEY;index++){ Z<,$Xv L  
  if(hCallWnd[index]==hWnd){ <#r/4a"V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [V-OYjPAx  
    hCallWnd[index]=NULL; ao(lj  
    HotKey[index]=0; |{G GATni  
    HotKeyMask[index]=0; YrWC\HR_  
    bRemoved=TRUE; jQc.@^#+x  
    KeyCount--; It .`  
    break; ;[~:Y[N  
   } ZLRAiL  
  } g)@d(EYY  
 } UZ"jQJQ  
 return bRemoved; ueM[&:g&MU  
} e<;^P(g`E  
I3wv6xZ2  
void VerifyWindow() X\a*q]"_  
{ X>`5YdT~+  
 for(int i=0;i<MAX_KEY;i++){ Bh\>2]~@a  
  if(hCallWnd!=NULL){ <7;AK!BH  
   if(!IsWindow(hCallWnd)){ !PIpvx{aX  
    hCallWnd=NULL; )GpH5N'EI  
    HotKey=0; lwU$*?yv  
    HotKeyMask=0; xc HG5bg |  
    KeyCount--; ojA i2uz  
   } 10 D6fkjf  
  } GvCB3z  
 } 8 FqhSzw  
} 1sT%g}w@|  
foOwJ}JU  
BOOL CHookApp::InitInstance() x/pM.NZF1  
{ }bg_?o;X}  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =Bq3O58+  
 hins=AfxGetInstanceHandle(); RrPo89o  
 InitHotkey(); WE hDep:  
 return CWinApp::InitInstance(); )t-Jc+*A>  
} {B_pjs  
cxNb!G  
int CHookApp::ExitInstance()  d Xiv8B1  
{ V*bX>D/  
 VerifyWindow(); 0xe!tA  
 UnInit(); {4@+ 2)l  
 return CWinApp::ExitInstance(); *nPB+@f  
} DD4fV`:kG  
fW,,@2P  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b& l/)DU  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &%ZiI@O-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *XCid_{(  
#if _MSC_VER > 1000 ,bQbj7  
#pragma once qXH\e|  
#endif // _MSC_VER > 1000 @vC7j>*4B  
45u\v2,C3  
class CCaptureDlg : public CDialog %L\buwjy$  
{ *r&q;ER  
 // Construction },d`<^~  
 public: XU3v#Du  
  BOOL bTray; c~1X/,biA  
  BOOL bRegistered; nS53mLU)  
  BOOL RegisterHotkey(); *,UD&N_)*6  
  UCHAR cKey; i"h '^6M1  
  UCHAR cMask; ,1s,G]%M  
  void DeleteIcon(); y$]gmg  
  void AddIcon(); 4a&*?=GG  
  UINT nCount; TaZw_)4c  
  void SaveBmp(); XYOPX>$T  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor @Y~R*^n"}  
  // Dialog Data yJheni  
  //{{AFX_DATA(CCaptureDlg)  fn1G^a=  
  enum { IDD = IDD_CAPTURE_DIALOG }; `o.DuvQ E  
  CComboBox m_Key; ~is$Onf99#  
  BOOL m_bControl; q:y_#r"_y  
  BOOL m_bAlt; /lC&'hT  
  BOOL m_bShift; sUfYEVjr  
  CString m_Path; }[[  
  CString m_Number; vu&%e\gM  
  //}}AFX_DATA Zj*kHjn"  
  // ClassWizard generated virtual function overrides L+c7.l.yT  
  //{{AFX_VIRTUAL(CCaptureDlg) qNLG-m,n<  
 public: ~1NK@=7T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2 f" =f^rf  
 protected: }w#Ek=,s#o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9'qU4I  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Y SvZ7G(m>  
  //}}AFX_VIRTUAL '%u7XuU-]  
  // Implementation [Ipg",Su;f  
 protected: r@2{>j8  
  HICON m_hIcon; LxM.z1  
  // Generated message map functions 6evW O!  
  //{{AFX_MSG(CCaptureDlg) g"60{  
  virtual BOOL OnInitDialog(); |HjoaN)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `ehZ(H}  
  afx_msg void OnPaint(); -7^A_!.  
  afx_msg HCURSOR OnQueryDragIcon(); Bc/'LI.%  
  virtual void OnCancel(); M<A*{@4$w&  
  afx_msg void OnAbout(); X_7cwPY  
  afx_msg void OnBrowse(); =?*6lS}gy  
  afx_msg void OnChange(); Lqt.S|  
 //}}AFX_MSG &nc 0stuL  
 DECLARE_MESSAGE_MAP() cmzu @zq  
}; 6O`s&T,t  
#endif D['z/r6F  
Y1?"Ut  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /-#1ys#F=  
#include "stdafx.h" !Od?69W, $  
#include "Capture.h" $#cZJ@;]  
#include "CaptureDlg.h" 'THcO*<  
#include <windowsx.h> X"hoDg  
#pragma comment(lib,"hook.lib") sG/mmZHYzr  
#ifdef _DEBUG 9(9+h]h+3  
#define new DEBUG_NEW .%.kEJh`  
#undef THIS_FILE JJ50(h)U  
static char THIS_FILE[] = __FILE__; ]%{.zl!  
#endif x2#5"/~4  
#define IDM_SHELL WM_USER+1 arCi$:-z@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !J5k?J&{=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X#qm wcF  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Nh I&wl  
class CAboutDlg : public CDialog D# $Fj  
{ "Ih>>|r  
 public: V)$y  
  CAboutDlg(); NZJ:@J=-  
  // Dialog Data jm-J_o;}z6  
  //{{AFX_DATA(CAboutDlg) hmA$gR_  
  enum { IDD = IDD_ABOUTBOX }; *H"IW0I  
  //}}AFX_DATA gaK m`#  
  // ClassWizard generated virtual function overrides @} nI$x.  
  //{{AFX_VIRTUAL(CAboutDlg) B?Vr9H7n  
 protected: sHqs)@D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fp jy[$8  
  //}}AFX_VIRTUAL #Ub"Ii  
  // Implementation wD|3Czc  
 protected: *4i)aj  
  //{{AFX_MSG(CAboutDlg) Zu4|1 W  
  //}}AFX_MSG L|y4u;-Q  
  DECLARE_MESSAGE_MAP() F{:ZHCm  
}; 0XrB+nt  
b7 pD#v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) X5@S LkJ-`  
{ ^w0V{qF{  
 //{{AFX_DATA_INIT(CAboutDlg) [79 eq=  
 //}}AFX_DATA_INIT (,5oqU9s@  
} O'6zV"<P  
p.r \|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Zz"b&`K  
{ uHBEpqC%  
 CDialog::DoDataExchange(pDX); ZP@or2No%  
 //{{AFX_DATA_MAP(CAboutDlg) Q9(J$_:  
 //}}AFX_DATA_MAP Qz T>h  
} bv.DW,l%'  
Q?f%]uGFQ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }(g`l)OX  
 //{{AFX_MSG_MAP(CAboutDlg) 1g_(xwUp+  
 // No message handlers 6sRe. ct<  
 //}}AFX_MSG_MAP C~do*rnM^  
END_MESSAGE_MAP() p!+7F\  
S?X2MX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Cm~h\+"  
: CDialog(CCaptureDlg::IDD, pParent) y8Q96zi  
{ =h?Q.vad  
 //{{AFX_DATA_INIT(CCaptureDlg) .Z,3:3,]  
  m_bControl = FALSE; 5yvaY "B  
  m_bAlt = FALSE; FmfPi .;1  
  m_bShift = FALSE; ?'xTSAn  
  m_Path = _T("c:\\"); ,BK6a'1J  
  m_Number = _T("0 picture captured."); ;l^4/BR  
  nCount=0; ?;{fqeJz  
  bRegistered=FALSE; v&6=(k{E@R  
  bTray=FALSE; -mSiZ  
 //}}AFX_DATA_INIT l!n<.tQW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]gN]Cw\L  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z_ Gb9  
} Xx;RH9YYz  
'%W'HqVcG1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U6hT*126  
{ 4Xna}7  
 CDialog::DoDataExchange(pDX); <OKzb3e  
 //{{AFX_DATA_MAP(CCaptureDlg) x+kP,v  
  DDX_Control(pDX, IDC_KEY, m_Key); -ff|Xxar{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -{Lc?=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); kI|Vv90l  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); FiTP-~  
  DDX_Text(pDX, IDC_PATH, m_Path); <O`yM2/pS  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s\c*ibxM,  
 //}}AFX_DATA_MAP < q6z$c)K  
} R3MbTg  
o8!gV/oy  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) QN%w\ JXS  
//{{AFX_MSG_MAP(CCaptureDlg) ?/mkFDN  
 ON_WM_SYSCOMMAND() *. H1m{V  
 ON_WM_PAINT() "W_C%elg  
 ON_WM_QUERYDRAGICON() X(D$eV  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) go, Hfb  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N4 O'{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rm7$i9DH2  
//}}AFX_MSG_MAP jTNfGu0x  
END_MESSAGE_MAP() F&{RP>  
o<`)cb }  
BOOL CCaptureDlg::OnInitDialog() Sz\"*W;>  
{ ^wL n  
 CDialog::OnInitDialog(); )4d)G5{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t 6.hg3Y  
 ASSERT(IDM_ABOUTBOX < 0xF000); m){.{Vn]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l@+WGh  
 if (pSysMenu != NULL) E$z)$`"1  
 { nwwKef(  
  CString strAboutMenu; 5xZ*U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7wt2|$Qz  
  if (!strAboutMenu.IsEmpty()) !6eXJ#~[E  
  { 8^fkY'x  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9N9dQ}[:g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0phO1h]2S)  
  } zl>l.zJ  
 } #;bpxz1lR9  
 SetIcon(m_hIcon, TRUE); // Set big icon v1hrRf2<  
 SetIcon(m_hIcon, FALSE); // Set small icon #4(/#K 1j  
 m_Key.SetCurSel(0); {~*aXu 3  
 RegisterHotkey(); Te%'9-jk  
 CMenu* pMenu=GetSystemMenu(FALSE); R jO9E.nm  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I0 y+,~\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =<-tD<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o0-7#2  
 return TRUE; // return TRUE unless you set the focus to a control AL.zF\?  
} /o =V (  
K\ww,S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2Wlk]  
{ {~g(WxE  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6qA48:/F=  
 { _=c>>X  
  CAboutDlg dlgAbout; $9znRTFEj  
  dlgAbout.DoModal(); @l9qH1  
 } 0NLoqq  
 else <BIj a  
 { Vp $]  
  CDialog::OnSysCommand(nID, lParam); *|n::9  
 } { 7y.0_Y  
} P5;LM9W  
2e}${NZN  
void CCaptureDlg::OnPaint() 9I>+Q&   
{ Q]_3 #_'  
 if (IsIconic()) zr9o  
 { R9SJ;TsE  
  CPaintDC dc(this); // device context for painting '3Ir(]Wfd  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q# W|*kL3  
  // Center icon in client rectangle 7<Fp3N 3  
  int cxIcon = GetSystemMetrics(SM_CXICON); pv2_A   
  int cyIcon = GetSystemMetrics(SM_CYICON); . xT8@]  
  CRect rect; s)$N&0\  
  GetClientRect(&rect); -Iz&/u*}f  
  int x = (rect.Width() - cxIcon + 1) / 2; EAQg4N:D7L  
  int y = (rect.Height() - cyIcon + 1) / 2; nG;wQvc  
  // Draw the icon LOyL:~$  
  dc.DrawIcon(x, y, m_hIcon); 2 Mc/ah  
 } Sf>R7.lpP  
 else _//)|.6c3  
 { !Gu,X'#Ab  
  CDialog::OnPaint(); u49zc9  
 } tE0DST/  
} 3Oy-\09  
8tWOVLquJ  
HCURSOR CCaptureDlg::OnQueryDragIcon() yp=Hxf  
{ LTu cs }  
 return (HCURSOR) m_hIcon; 03*` T  
} aG7QLCL  
)r v5QH`i  
void CCaptureDlg::OnCancel() nAn/Vu  
{ o+W5xHe^1  
 if(bTray) ]=p@1  
  DeleteIcon(); 'iO?M'0gE#  
  CDialog::OnCancel(); &~P5 [[Q  
} }LS:f,1oGp  
8P r H"pI  
void CCaptureDlg::OnAbout() @ NGK2J  
{ *>!O2c  
 CAboutDlg dlg; Efi@hdEV  
 dlg.DoModal(); o.t$hv|  
} &LE,.Q34  
Zam.g>{]  
void CCaptureDlg::OnBrowse() ^yH!IRRAq  
{ s z  
 CString str; 2wE?O^J  
 BROWSEINFO bi; ]]{$X_0n  
 char name[MAX_PATH]; D3V5GQ\=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W B)<B  
 bi.hwndOwner=GetSafeHwnd(); WO W4c&  
 bi.pszDisplayName=name; 3jPua)=p  
 bi.lpszTitle="Select folder"; ~<Z;)e  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @'U9*:}U  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *)k}@tY  
 if(idl==NULL)  ZSq7>}  
  return; `_sc_Y|C!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pN/)$6=  
 str.ReleaseBuffer(); M}NmA  
 m_Path=str; &~U!X~PpB  
 if(str.GetAt(str.GetLength()-1)!='\\') T^u][I3*  
  m_Path+="\\"; W R@=[G#TJ  
 UpdateData(FALSE); h5WS<P  
} Y - 6 ?x  
e{8z1t20:  
void CCaptureDlg::SaveBmp() z]ZhvH7-  
{ vlth\ [  
 CDC dc; x\r7q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2?ac\c6"  
 CBitmap bm; ]Mi ~vG q  
 int Width=GetSystemMetrics(SM_CXSCREEN); ?P[uf  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z^,C><Yt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9ctvy?53H  
 CDC tdc; GHeJpS  
 tdc.CreateCompatibleDC(&dc); jr{C/B}  
 CBitmap*pOld=tdc.SelectObject(&bm); $$~x: iN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !7!xJ&/V  
 tdc.SelectObject(pOld); 8;;!2>N  
 BITMAP btm; uZ( I|N$  
 bm.GetBitmap(&btm); L+Yn}"gIs  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]kq{9b';  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a'f"Zdh%w  
 BITMAPINFOHEADER bih; Rk.YnA_J6  
 bih.biBitCount=btm.bmBitsPixel; Rkm1fYf  
 bih.biClrImportant=0; WS8m^~S@\  
 bih.biClrUsed=0; )%x oN<  
 bih.biCompression=0; emOd<C1A  
 bih.biHeight=btm.bmHeight; x/Se /C  
 bih.biPlanes=1; [H z_x(t26  
 bih.biSize=sizeof(BITMAPINFOHEADER); <qN0Q7  
 bih.biSizeImage=size; T!5m'Q.  
 bih.biWidth=btm.bmWidth; 8 $0D-z  
 bih.biXPelsPerMeter=0; sfi.zu G  
 bih.biYPelsPerMeter=0; <m9hM?^q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); |WH'aGG  
 static int filecount=0; QlJ cj+_h  
 CString name; h`dtcJ0  
 name.Format("pict%04d.bmp",filecount++); ,<F=\G_f  
 name=m_Path+name; &=H{ 36i@  
 BITMAPFILEHEADER bfh; q}>1Rr|U`  
 bfh.bfReserved1=bfh.bfReserved2=0; ?D-1xnxep  
 bfh.bfType=((WORD)('M'<< 8)|'B'); duB{ 1  
 bfh.bfSize=54+size; ;NH 5 L,  
 bfh.bfOffBits=54; 9Y!N\-x`  
 CFile bf; / pzdX%7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S-{[3$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); c^vP d]Ed  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \"B?'Ep;  
  bf.WriteHuge(lpData,size); 7l> |G,[c  
  bf.Close(); D].!u{##  
  nCount++; PVHJIB  
 } *LpEH,J  
 GlobalFreePtr(lpData); >_P7k5Y^  
 if(nCount==1) D-e0q)RSU  
  m_Number.Format("%d picture captured.",nCount); G%w.Z< qy  
 else )orVI5ti  
  m_Number.Format("%d pictures captured.",nCount); !s pp*Q)#\  
  UpdateData(FALSE); Ig75bZz   
} occ^bq  
T%~w~stW  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 01N "  
{ w naP?|/  
 if(pMsg -> message == WM_KEYDOWN) {'VP_ZS1v  
 { r(xh5{^x  
  if(pMsg -> wParam == VK_ESCAPE) O6Bs!0,  
   return TRUE; )o)<5Iqh  
  if(pMsg -> wParam == VK_RETURN) }&D~P>1  
   return TRUE; C,7d  
 } s.I%[kada  
 return CDialog::PreTranslateMessage(pMsg); j78WPG  
} &v|Uy}h&%1  
=!T@'P?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !E!i`yF  
{ DhY.5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ d4KT wn5g  
  SaveBmp(); IWcgh`8  
  return FALSE; OV3l)73?t  
} v+uq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ HE58A.Q&  
 CMenu pop; D ]Q,~Y&'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wBZ=IMDu\  
 CMenu*pMenu=pop.GetSubMenu(0); 1O@ qpNm  
 pMenu->SetDefaultItem(ID_EXITICON); q/U(j&8W{  
 CPoint pt; n&ZA rJ  
 GetCursorPos(&pt); r(;oDdVc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +\g/KbV7  
 if(id==ID_EXITICON) X{4jyi-<  
  DeleteIcon(); /a.4atb0  
 else if(id==ID_EXIT) ?q a  
  OnCancel(); 't:$Lx  
 return FALSE; K ;\~otR^  
} 2 Ya)I k{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MuXp*s3[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +v.uP [H  
 AddIcon(); {<&i4;  
 return res; @_s`@ ,=  
} Ie{98  
Qt`hUyL  
void CCaptureDlg::AddIcon() #HFB* >  
{ p=%Vo@*]  
 NOTIFYICONDATA data; s}Phw2`1U  
 data.cbSize=sizeof(NOTIFYICONDATA); y4*i V;"  
 CString tip; K"u-nroHW  
 tip.LoadString(IDS_ICONTIP); HT&CbEa4'  
 data.hIcon=GetIcon(0); & $E[l'  
 data.hWnd=GetSafeHwnd(); uQh dg4  
 strcpy(data.szTip,tip); X[/>{rK  
 data.uCallbackMessage=IDM_SHELL; 0VsQ$4'V^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; o V"d%ks  
 data.uID=98; xxjg)rVuy  
 Shell_NotifyIcon(NIM_ADD,&data); B1<:nl  
 ShowWindow(SW_HIDE); D.d(D:  
 bTray=TRUE; ZrY #B8  
} p}q27<O*/  
D![42H+-Qd  
void CCaptureDlg::DeleteIcon() !5,>[^y3  
{ |^fubQs;2  
 NOTIFYICONDATA data; <xM$^r)  
 data.cbSize=sizeof(NOTIFYICONDATA); DfYOGs]@  
 data.hWnd=GetSafeHwnd(); 3ARvSz@5  
 data.uID=98; Gk_%WY*  
 Shell_NotifyIcon(NIM_DELETE,&data); Z] ?Tx2|7  
 ShowWindow(SW_SHOW); m$<LO%<~p  
 SetForegroundWindow(); HYVSi3[  
 ShowWindow(SW_SHOWNORMAL); MKVz'-`u  
 bTray=FALSE; ?bFP'.  
} k1tJ$}  
X&C&DTB  
void CCaptureDlg::OnChange() j("$qp v  
{ \H(r }D$u<  
 RegisterHotkey(); _vOV(#q2a  
} ,n\"zYf ]^  
_Z~cJIEU  
BOOL CCaptureDlg::RegisterHotkey() =KQQS6  
{ & Tz@lvOv%  
 UpdateData(); vBy t_X  
 UCHAR mask=0; }/tT=G]91  
 UCHAR key=0; 7$3R}=Z`\q  
 if(m_bControl) S1jI8 #z}_  
  mask|=4; m(0sG(A~  
 if(m_bAlt) 4I7B #{  
  mask|=2; \s_lB~"P!3  
 if(m_bShift) rJLn=|uR  
  mask|=1; 3V=(P.ATm  
  key=Key_Table[m_Key.GetCurSel()]; A:|dY^,:?*  
 if(bRegistered){ c:#<g/-{wM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); b#ga  
  bRegistered=FALSE; bVfFhfh*  
 } e^v5ai  
 cMask=mask; UN ;9h9  
 cKey=key; &O|!w&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2P\k;T(  
 return bRegistered; hxG=g6:G  
} V|6PKED  
+'fy%/  
  四、小结 w Vegr  
(!b_o A8V  
  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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