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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: sg6w7fp>  
  Yr"!&\[oz  
  一、实现方法 C`th^dqBV  
B:A1W{l  
  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: k.=S+#"}  
(|a$N.e&K  
#pragma data_seg("shareddata") x+*L5$;h  
HHOOK hHook =NULL; //钩子句柄 o~.o^0Y  
UINT nHookCount =0; //挂接的程序数目 $YGIN7_Gg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mb~=Xyk&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ox\B3U%`p}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &W)+8N,L  
static int KeyCount =0; [;IDTo!<>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 hDD~,/yVxs  
#pragma data_seg() y5AXL5  
+%le/Pg@  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 X~)V)'R  
\A3>c|  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: x(3 I?#kE  
x,w`OMQ}c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 32bkouq  
cKey,UCHAR cMask) ]g8i>,G  
{ gM;)  
 BOOL bAdded=FALSE; Q&.IlVB[  
 for(int index=0;index<MAX_KEY;index++){ gGI#QPT`X  
  if(hCallWnd[index]==0){ @^:7UI_  
   hCallWnd[index]=hWnd; Z*)y.i`  
   HotKey[index]=cKey; r_V2 J{B  
   HotKeyMask[index]=cMask; EYJi6#  
   bAdded=TRUE; Ot2zhR )  
   KeyCount++; 94'k 7_q  
   break; )S wG+k,  
  } V$Xl^#tN  
 } /:Z~"Q*r  
 return bAdded; _8NEwwhc  
} ;1R?9JN"  
//删除热键 FUzMc1zy|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Dc&9emKI  
{ _r<zSH%  
 BOOL bRemoved=FALSE; _,Rsl$Tk'  
 for(int index=0;index<MAX_KEY;index++){ -e`oW.+  
  if(hCallWnd[index]==hWnd){ IB#iJ# ,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1|l)gfcP  
    hCallWnd[index]=NULL; VT5cxB<  
    HotKey[index]=0; <>T&ab@dE(  
    HotKeyMask[index]=0; =;k+g?.@I  
    bRemoved=TRUE; ni"$[8U  
    KeyCount--; tkdBlG]!  
    break; k binf  
   } :p\(y  
  }  zU4V^N'  
 } wzDk{4U  
 return bRemoved; c+Q.?vJ  
} t4jd KYA  
j5,^9'  
y} $ P,  
  DLL中的钩子函数如下: KTLbqSS\  
l?o-!M{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !Ig|m+  
{ ##EB; Y  
 BOOL bProcessed=FALSE; zldfRo\wl  
 if(HC_ACTION==nCode) )y%jLiQv  
 { ]< s\V-y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R%Ui6dCLo  
   switch(wParam) `FzYvd"N  
   {  d4y9AE@k  
    case VK_MENU: FUyB"-<  
     MaskBits&=~ALTBIT; s.R-<Y 3  
     break; 68koQgI[^  
    case VK_CONTROL: ( K6~Tj  
     MaskBits&=~CTRLBIT; `x{.z=xC  
     break; Sc4obcw%  
    case VK_SHIFT: N"Qg\PS_  
     MaskBits&=~SHIFTBIT; tT@w%Sz57N  
     break; MG7 ?N #  
    default: //judge the key and send message ~|y^\U@  
     break; ` j&0VIU>>  
   } T}L^CU0  
   for(int index=0;index<MAX_KEY;index++){ Ci7P%]9  
    if(hCallWnd[index]==NULL) 7K>D@O  
     continue; "EcX_>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C%}]"0Q1  
    { &dhcKO<4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %Y cxC0S[  
     bProcessed=TRUE; kf%&d}2to  
    } 9 3W  
   } .N~PHyXZR  
  } .>mH]/]m  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]>R`;"(  
   switch(wParam) AW,v  
   { V;h=8C5J  
    case VK_MENU: e/"yGQu  
     MaskBits|=ALTBIT; X q}Ucpj  
     break; mF[o*N*  
    case VK_CONTROL: lZ|L2Yg3uB  
     MaskBits|=CTRLBIT; ||-nmOy  
     break; Vs#"SpH{'  
    case VK_SHIFT: 8 uDerJ!  
     MaskBits|=SHIFTBIT; jd%Len&p  
     break; YSR mt/  
    default: //judge the key and send message !_CX2|  
     break; kz ZDtI)  
   } q"gqO%Wb|  
   for(int index=0;index<MAX_KEY;index++){ qP~WEcH`[  
    if(hCallWnd[index]==NULL) ,?l~rc  
     continue; G'ij?^?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R)0N0gH  
    { \~JNQ&_o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +h0PR?  
     bProcessed=TRUE; s kN9O"^A  
    } $> "J"IX  
   } k: b/Gq`  
  } Q~Ay8L+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 v,/[&ASz  
   for(int index=0;index<MAX_KEY;index++){ yXJ]U \ %  
    if(hCallWnd[index]==NULL) J|V K P7  
     continue; X}ZlWJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XD PL;(?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :P3{Nxa  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +c^_^Z$_4o  
   } s|Z:}W?{  
  } PG{i,xq_B{  
 } ?b||Cr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =43I1&_   
} 0cHfxy3  
O^5UB~  
  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: KAd_zkUA  
+7,8w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Zy^=fM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DH 6q7"@  
 n;wwMMBM  
  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: yL0f1nS  
f|OI`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) RFw(]o,9cR  
{ Z&_y0W=t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) PK_s#uC  
 { otO j^xU  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qAoAUD m  
  SaveBmp(); 'T\dkSJv;V  
  return FALSE; )2xE z  
 } vxZg &SRK  
 …… //其它处理及默认处理 > 2#%$lX6  
} '"y}#h__T  
Yc^%zxub  
R (G2qi  
  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。 +a%xyD:.?  
3gAR4  
  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。 xq}-m!nX  
\[yr=X  
  二、编程步骤 j&5G\6:  
)zU:  
  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"; ]*qU+&  
axmsrj W#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7paUpQit  
 EIr@g  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _a](V6  
@Mm/C?#*O  
  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; jpRBER_X  
%SAw;ZtQ:  
  5、 添加代码,编译运行程序。 `Oq M8U @  
;j{7!GeKa  
三、程序代码 lwc5S `"  
MaO"#{i  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL gH[,Xx?BN!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ojq]HM6f  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ zJ+3g!  
#if _MSC_VER > 1000 mzWP8Hlw  
#pragma once l _+6=u  
#endif // _MSC_VER > 1000 O sQkA2=  
#ifndef __AFXWIN_H__ #uSK#>H_!  
#error include 'stdafx.h' before including this file for PCH Us,)]W.S  
#endif =!BobC- [b  
#include "resource.h" // main symbols afHaB/t{R  
class CHookApp : public CWinApp ks*Y9D*=  
{ q*, Q5  
 public: uRE*%d>  
  CHookApp(); )P?IqSEA%  
  // Overrides re^Hc(8M  
  // ClassWizard generated virtual function overrides >c4/ ?YV  
  //{{AFX_VIRTUAL(CHookApp) 'cV?i&;  
 public: yhpz5[AuO  
  virtual BOOL InitInstance(); rEdY>\'  
  virtual int ExitInstance(); `9Yn0B.  
  //}}AFX_VIRTUAL (luKn&826  
  //{{AFX_MSG(CHookApp) w&Y{1rF>  
  // NOTE - the ClassWizard will add and remove member functions here. +`B'r '  
  // DO NOT EDIT what you see in these blocks of generated code ! 3uV4/% U  
  //}}AFX_MSG w7FoL  
  DECLARE_MESSAGE_MAP() 8Hi!kc;f6>  
}; ^rL_C}YBj-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KB!5u9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 87V1#U^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UL( lf}M  
BOOL InitHotkey(); {hQ6K)s  
BOOL UnInit(); I9Eu',  
#endif Kc #|Z  
ecj7BT[mLI  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Dzl;-]S  
#include "stdafx.h" o%`Xa#*Ly  
#include "hook.h" im]g(#GnKh  
#include <windowsx.h> +pf5\#l?  
#ifdef _DEBUG 6?qDdVR~]  
#define new DEBUG_NEW #DFV=:|~  
#undef THIS_FILE <@G8ni  
static char THIS_FILE[] = __FILE__; KVPR}qTP;  
#endif wJeG(h  
#define MAX_KEY 100 Md,pDWb  
#define CTRLBIT 0x04 v .=/Y(J  
#define ALTBIT 0x02 h1[WhBL-O  
#define SHIFTBIT 0x01 QJn`WSw$_-  
#pragma data_seg("shareddata") DWU`\9xA*  
HHOOK hHook =NULL; ff e1lw%  
UINT nHookCount =0; fY,|o3#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >Kivuc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT sbj";h=E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L?5f+@0.  
static int KeyCount =0; \( )# e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }7s>B24J  
#pragma data_seg() HfB@vw^  
HINSTANCE hins; HN6}R|IH  
void VerifyWindow(); El- ? %  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) e5?PkFV^a1  
//{{AFX_MSG_MAP(CHookApp) a.@qGsIH  
// NOTE - the ClassWizard will add and remove mapping macros here. ~Rpm-^  
// DO NOT EDIT what you see in these blocks of generated code! ~+G#n"Pn  
//}}AFX_MSG_MAP P[ r];e  
END_MESSAGE_MAP() ?wb+L  
X^@ I].  
CHookApp::CHookApp() 17|np2~  
{ pI.+"Hz  
 // TODO: add construction code here, Sv'y e  
 // Place all significant initialization in InitInstance l"(6]Z 4  
} e`K)_>^n#  
Zg~nlO2  
CHookApp theApp; ]m4OIst  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1L nyWZ  
{ dRi5hC$  
 BOOL bProcessed=FALSE; ememce,Np  
 if(HC_ACTION==nCode) _ oFs #kW  
 { 2xwlKmI N  
  if((lParam&0xc0000000)==0xc0000000){// Key up e@#kRklV&  
   switch(wParam) 5J2=`=FK  
   { 1ocJ+  
    case VK_MENU: ;CHi\+` 5  
     MaskBits&=~ALTBIT; ~utJB 'gr  
     break; BvD5SBa}"  
    case VK_CONTROL: tV;`fV   
     MaskBits&=~CTRLBIT; Y&HK1>M_  
     break; o%E;3l  
    case VK_SHIFT: uI~S=;o  
     MaskBits&=~SHIFTBIT; px;/8c-  
     break; U]|agz>  
    default: //judge the key and send message E.`U`L  
     break; qZv =  
   } laKuOx}  
   for(int index=0;index<MAX_KEY;index++){ Pmg)v!"  
    if(hCallWnd[index]==NULL) .@q-B+Eg  
     continue; ?, r~=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X-LA}YH=tS  
    { 8.J( r(;>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;%C'FV e]  
     bProcessed=TRUE; v``-F(i$  
    } )E#2J$TD  
   } =sJ _yq0#R  
  } [, RI-#n  
  else if((lParam&0xc000ffff)==1){ //Key down -]uUYe c  
   switch(wParam) I<td1Y1q  
   { y&m0Lz53Z  
    case VK_MENU: # ]?bLm<!  
     MaskBits|=ALTBIT; I04jjr:<  
     break; cF)/^5Z  
    case VK_CONTROL: B+d<F[ |  
     MaskBits|=CTRLBIT; F>je4S;  
     break; |{r$jZeE  
    case VK_SHIFT: A>`945|  
     MaskBits|=SHIFTBIT; 51C2u)HE  
     break; `:m!~  
    default: //judge the key and send message '_\;jFAM  
     break; $''?HjB}T  
   } }9HmTr|  
   for(int index=0;index<MAX_KEY;index++) j(:I7%3&(*  
   { f3j{VN  
    if(hCallWnd[index]==NULL) =]`lN-rYw  
     continue; u]-_<YZ'B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1n5(S<T  
    { @`opDu!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :2 >hoAJJ  
     bProcessed=TRUE; 0Sq][W=  
    } '>$EOg"  
   } X,aYK;q%z  
  } `afIYXP  
  if(!bProcessed){ U[L9*=P;  
   for(int index=0;index<MAX_KEY;index++){  VGHWNMT  
    if(hCallWnd[index]==NULL) s>k Uh  
     continue; 7|\@zQ h   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `\`>0hlu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *L6PLe  
   } PWRy7d  
  } ;8WZx  
 } T{qTj6I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H1GRMDNXOA  
} Jj~EiA  
 T9)nQ[  
BOOL InitHotkey() &cWjE x  
{ NjPDX>R\K  
 if(hHook!=NULL){ 8dD2  
  nHookCount++; <!-sZ_qq  
  return TRUE; W?yd#j  
 } b*a2,MiM  
 else |Fm6#1A@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BqDKT  
  if(hHook!=NULL) dkgSvi :!  
   nHookCount++; YprH wL  
  return (hHook!=NULL); }+o:j'jB  
} MV_Srz  
BOOL UnInit() dY?`f<*  
{ }bN%u3mHws  
 if(nHookCount>1){ )"zvwgaW  
  nHookCount--; 73{'k K  
  return TRUE; Q9}dHIe1E  
 } DRqZ,[!+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); o1&:ry  
 if(unhooked==TRUE){ -<jL~][S  
  nHookCount=0; Fhv/[j^X  
  hHook=NULL; g  %K>  
 } } VJfJ/  
 return unhooked; vZ/6\Cz  
} }X GEX:1K  
3nT Z)L }  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \s3]_1F;t  
{ *  tCS  
 BOOL bAdded=FALSE; JN^ &S  
 for(int index=0;index<MAX_KEY;index++){ U\/5;Txy(  
  if(hCallWnd[index]==0){ DG4 d"Jy  
   hCallWnd[index]=hWnd; G}5#l  
   HotKey[index]=cKey; 4Mk-2 Dx  
   HotKeyMask[index]=cMask; gaA<}Tp,  
   bAdded=TRUE; 5es[Ph|K5  
   KeyCount++; yc|VJ2R*  
   break; 1@u2im-O  
  } k = ?h~n0M  
 } WI]o cF  
 return bAdded; ^[%%r3"$C  
} V8eB$in  
S'oGt&Z<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OD' ]:  
{ $$:ZX  
 BOOL bRemoved=FALSE; $/6;9d^  
 for(int index=0;index<MAX_KEY;index++){ 2[0JO.K 4  
  if(hCallWnd[index]==hWnd){ *:i1Lv@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VG/3xR&y  
    hCallWnd[index]=NULL; U hIDRR  
    HotKey[index]=0; K)TrZ 2  
    HotKeyMask[index]=0; 7~#:>OjW  
    bRemoved=TRUE; E\gim<]  
    KeyCount--; \{Q?^E  
    break; S+TOSjfis  
   } \om%Q[F7a  
  } {3N'D2N  
 }  L4uFNM]  
 return bRemoved; u?s VcD[  
} ng:Q1Q9N  
wts=[U`(  
void VerifyWindow() uEc<}pV  
{ - 0?^#G}3}  
 for(int i=0;i<MAX_KEY;i++){ GUslPnG  
  if(hCallWnd!=NULL){ cb5,P~/q  
   if(!IsWindow(hCallWnd)){ 2Z20E$Cb  
    hCallWnd=NULL; {'16:dTJ  
    HotKey=0; EUsI%p  
    HotKeyMask=0; D&HV6#  
    KeyCount--; hHqh{:q{v  
   } Kx_h1{  
  } ]Qm]I1P  
 } @ 49nJi  
} VLBE'3Qg 1  
5k|9gICyd*  
BOOL CHookApp::InitInstance() i-yy/y-N  
{ @ P|LLG'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); OFje+S  
 hins=AfxGetInstanceHandle(); 1Bxmm#  
 InitHotkey(); eAPXWWAZJ1  
 return CWinApp::InitInstance(); ~ ihI_q"  
} ,vW:}&U  
pLv$\ MiZ  
int CHookApp::ExitInstance() fib}b? vk  
{ 3> /K0N|$  
 VerifyWindow(); 5q "ON)x  
 UnInit(); DWdW,xG  
 return CWinApp::ExitInstance(); +l=r#JF  
} mZ1)wH,  
%LYnxo7#C  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xq"Jy=4Q*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #97h6m?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Fs[aa#v4B  
#if _MSC_VER > 1000 Vb BPB5 $q  
#pragma once u{["50~  
#endif // _MSC_VER > 1000 ax 41N25  
!nAX$i~  
class CCaptureDlg : public CDialog ? `J[[",  
{ ~}Rj$%_  
 // Construction r H~" 4  
 public: 3]?#he  
  BOOL bTray; %Qk/_ R1   
  BOOL bRegistered; LkQX?2>]  
  BOOL RegisterHotkey(); O9:U8$*  
  UCHAR cKey; Ali9pvE  
  UCHAR cMask; y!]CJigpZ  
  void DeleteIcon(); ExRe:^yU\  
  void AddIcon(); ?k(\ApVHj  
  UINT nCount; ws^4?O  
  void SaveBmp(); sUE?v9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &>H!}"Yk  
  // Dialog Data !Ra*)b "  
  //{{AFX_DATA(CCaptureDlg) =~p>`nV  
  enum { IDD = IDD_CAPTURE_DIALOG }; -\#0]F:-  
  CComboBox m_Key; r_;9' #&'  
  BOOL m_bControl; /rSH"$  
  BOOL m_bAlt; Ks}Xgc\  
  BOOL m_bShift; ,-z9 #t  
  CString m_Path; KF4PJi;*  
  CString m_Number; z5TuGY b<  
  //}}AFX_DATA %6_AM  
  // ClassWizard generated virtual function overrides qTQBt}  
  //{{AFX_VIRTUAL(CCaptureDlg) +Jr|z\  
 public: p<:!)kt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3MRc 4UlB  
 protected: Y3O#Q)-j$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -kbg\,PW  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [LRLJ_~g5  
  //}}AFX_VIRTUAL M`S0u~#tI  
  // Implementation %Z*sU/^  
 protected: bu51$s?B  
  HICON m_hIcon; V\6]n2  
  // Generated message map functions \}]!)}G  
  //{{AFX_MSG(CCaptureDlg) O`vTnrY  
  virtual BOOL OnInitDialog(); Zkf0p9h\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VsA'de!V4[  
  afx_msg void OnPaint(); WVLHfkN  
  afx_msg HCURSOR OnQueryDragIcon(); 1IVuSp`{FU  
  virtual void OnCancel(); tY <Z'xA?  
  afx_msg void OnAbout(); VcoOeAKL  
  afx_msg void OnBrowse(); *_?dVhxf  
  afx_msg void OnChange(); 0:b2(^]bg  
 //}}AFX_MSG RVeEkv[qp  
 DECLARE_MESSAGE_MAP() _/O25% l  
}; +k`!QM>e-  
#endif @]ao"ui@/  
: "1XPr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Onwp-!!.  
#include "stdafx.h"  @Pt="*g  
#include "Capture.h" GH[wv<  
#include "CaptureDlg.h" +5XpzZ{#Wa  
#include <windowsx.h> yBI'djL~>  
#pragma comment(lib,"hook.lib") &~W:xg(jN  
#ifdef _DEBUG q&d~ \{J  
#define new DEBUG_NEW 6&/T@LQYrh  
#undef THIS_FILE RZ+`T+zL  
static char THIS_FILE[] = __FILE__; p QizJ6  
#endif __.+s32SS$  
#define IDM_SHELL WM_USER+1 4^URX >nx8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QVtQx>K`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~s5SZK*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RSo& (Uv  
class CAboutDlg : public CDialog 9:M` j  
{ ^_m9KA  
 public: YY!Rz[/  
  CAboutDlg(); 71\xCSI1w&  
  // Dialog Data "&3h2(#%  
  //{{AFX_DATA(CAboutDlg) ~ yX2\i"  
  enum { IDD = IDD_ABOUTBOX }; KGg3 !jY  
  //}}AFX_DATA e;(0(rI  
  // ClassWizard generated virtual function overrides y99mC$"Ee`  
  //{{AFX_VIRTUAL(CAboutDlg)  #B\" '8#  
 protected: AA7C$;Z15~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pa# IJ  
  //}}AFX_VIRTUAL s;A@*Y;v  
  // Implementation cb}[S:&|  
 protected: uS^Ipxe\  
  //{{AFX_MSG(CAboutDlg) ye MB0Z*r  
  //}}AFX_MSG ZMq6/G*fD  
  DECLARE_MESSAGE_MAP() s)pbS}L  
}; Sm5H_m!  
' MxrQ;|S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,S!azN=  
{ }+sT4'Ah>  
 //{{AFX_DATA_INIT(CAboutDlg) Er{>p|n =  
 //}}AFX_DATA_INIT yNTK .  
} ej"+:. "\e  
0vw4?>Jf@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VTH> o>g  
{ >qF CB\(  
 CDialog::DoDataExchange(pDX); ^- d%r  
 //{{AFX_DATA_MAP(CAboutDlg) -(=eM3o-9m  
 //}}AFX_DATA_MAP 3p'I5,}  
} Cid ;z  
GmP@;[H"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8Q'0h m?  
 //{{AFX_MSG_MAP(CAboutDlg) {yExQbN  
 // No message handlers %QP0  
 //}}AFX_MSG_MAP 2=^m9%  
END_MESSAGE_MAP() n<u $=H  
X)% A6M  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [D4Es  
: CDialog(CCaptureDlg::IDD, pParent) >j QWn@  
{ J7g8D{4  
 //{{AFX_DATA_INIT(CCaptureDlg) \QCJ4}\CS  
  m_bControl = FALSE; Dbz3;t  
  m_bAlt = FALSE; ^t#&@-'(d  
  m_bShift = FALSE; $\U 4hHOo  
  m_Path = _T("c:\\"); c-0#w=  
  m_Number = _T("0 picture captured."); >o=-$gz`  
  nCount=0; # }y2)g  
  bRegistered=FALSE; BGX.U\uc  
  bTray=FALSE; sdo [D  
 //}}AFX_DATA_INIT k1D@fiz  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3(,?S$>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rQ qW_t%  
} w {3<{  
)z28=%g  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ptdpj)oi&Q  
{ e(<st r>  
 CDialog::DoDataExchange(pDX); [wzb<"kW  
 //{{AFX_DATA_MAP(CCaptureDlg) s|y "WDyx5  
  DDX_Control(pDX, IDC_KEY, m_Key); ZG&>:Si;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mmk=97  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #iHs* /85  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); O[ef#R!  
  DDX_Text(pDX, IDC_PATH, m_Path); XcUwr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y<%@s}zc  
 //}}AFX_DATA_MAP  UWo]s.  
} P&^;656r  
wLnf@&jQ%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9eQxit7  
//{{AFX_MSG_MAP(CCaptureDlg) dx@-/^.  
 ON_WM_SYSCOMMAND() m()RU"WY  
 ON_WM_PAINT() 8p:e##%  
 ON_WM_QUERYDRAGICON() 9~/J35  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <"my^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R[hzMU}KB  
 ON_BN_CLICKED(ID_CHANGE, OnChange) z?*w8kU&>  
//}}AFX_MSG_MAP N@Uy=?)ZJ  
END_MESSAGE_MAP() LAS'u "c|  
2so!  
BOOL CCaptureDlg::OnInitDialog() 8b;1F Q'  
{ f@|A[>"V  
 CDialog::OnInitDialog(); J`].:IOh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oUQ,61H  
 ASSERT(IDM_ABOUTBOX < 0xF000); t^G"f;Ra+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %UERc{~o*,  
 if (pSysMenu != NULL) e9U9Uu[  
 { ?Yth0O6?sb  
  CString strAboutMenu; Ku} Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^<a t'jk6  
  if (!strAboutMenu.IsEmpty()) gL *>[@RO  
  { _8F`cuyW  
   pSysMenu->AppendMenu(MF_SEPARATOR); q %"VYt4  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~lsl@  
  } g'n7T|h ~  
 } 9\mLW"  
 SetIcon(m_hIcon, TRUE); // Set big icon &&8IU;J  
 SetIcon(m_hIcon, FALSE); // Set small icon `n @*{J8  
 m_Key.SetCurSel(0); 6"J? #  
 RegisterHotkey(); q!u~jI9 j  
 CMenu* pMenu=GetSystemMenu(FALSE); n%o5kVx0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >\P@^ h]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wc}5m Hs  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); E%,^Yvh/  
 return TRUE; // return TRUE unless you set the focus to a control FE (ev 9@  
} PIoLywpRn  
87 $dBb{  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .yqM7U_  
{ f=r<nb'H  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) AicBSqUke  
 { 3yU.& k  
  CAboutDlg dlgAbout; (mTE;s(  
  dlgAbout.DoModal(); ~O oidKT  
 } $Y/9SV,  
 else ( +Q&[E"87  
 { g4=pnK8  
  CDialog::OnSysCommand(nID, lParam); /-_h1.!   
 } )f[ B6Y  
} =C8?M  
EIf5(/jo  
void CCaptureDlg::OnPaint() kwo3`b  
{ KyYMfC  
 if (IsIconic()) gM u"2I5  
 { t!W(_8j  
  CPaintDC dc(this); // device context for painting CUBEW~X}M  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :OhHb #D  
  // Center icon in client rectangle ^6MU 0Q2  
  int cxIcon = GetSystemMetrics(SM_CXICON); p'*>vk  
  int cyIcon = GetSystemMetrics(SM_CYICON); G\Cp7:j}  
  CRect rect; vgH3<pDiU6  
  GetClientRect(&rect); mGJKvJF   
  int x = (rect.Width() - cxIcon + 1) / 2; 6;\I))"[  
  int y = (rect.Height() - cyIcon + 1) / 2; (a.z9nqGA  
  // Draw the icon w[zjerH3  
  dc.DrawIcon(x, y, m_hIcon); =hC,@R>;  
 } 93("oBd[s(  
 else [65 `$x-  
 { ~962i#&4  
  CDialog::OnPaint(); ao1(]64X"  
 } 8*#R]9  
} s%nUaWp~  
%et } A93  
HCURSOR CCaptureDlg::OnQueryDragIcon() .oYl-.E>&  
{ :8=ikwQ  
 return (HCURSOR) m_hIcon; &_dt>.  
} {JZZZY!n2  
&5fJPv &  
void CCaptureDlg::OnCancel() c'>/  
{ f_jo+z{-ik  
 if(bTray) >z{d0{\  
  DeleteIcon(); XHK<AO^  
  CDialog::OnCancel(); }Jy8.<Gd^  
} AS'R?aX|C  
/Y W>*?"N  
void CCaptureDlg::OnAbout() CrC^1K  
{ ]@j*/IP  
 CAboutDlg dlg; %Gz0^[+  
 dlg.DoModal(); ^84G%)`&  
} rzhWw-GY  
J%v=yBC2  
void CCaptureDlg::OnBrowse() +%T\`6  
{ \qdHX  
 CString str; Bu<M\w?7Y  
 BROWSEINFO bi; ;4R$g5-4X  
 char name[MAX_PATH]; wSzv|\ G  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y!~49<;  
 bi.hwndOwner=GetSafeHwnd(); $+8cc\fq  
 bi.pszDisplayName=name; Pk{_(ybaY  
 bi.lpszTitle="Select folder"; =9y[1t  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?26I,:;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); A!s`[2 Z  
 if(idl==NULL) jSh5!6O  
  return; ddJQC|xR}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >kj`7GA  
 str.ReleaseBuffer(); qON|4+~u%  
 m_Path=str; R&8Iz yM  
 if(str.GetAt(str.GetLength()-1)!='\\') H[s(e5 6z  
  m_Path+="\\"; kO.%9wFbz  
 UpdateData(FALSE); =x%dNf$e{W  
} 2h|MXI\g  
b#uL?f  
void CCaptureDlg::SaveBmp() @| M|+k3  
{ @Lpq~ 1eZB  
 CDC dc; \\PjKAsh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $UMFNjL  
 CBitmap bm; Ygm`ZA y  
 int Width=GetSystemMetrics(SM_CXSCREEN); eJF5n#  
 int Height=GetSystemMetrics(SM_CYSCREEN); 8p^bD}lN7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); cv-PRH#  
 CDC tdc; ?]|\4]zV  
 tdc.CreateCompatibleDC(&dc); / ;$#d}R  
 CBitmap*pOld=tdc.SelectObject(&bm); {C 6=[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QwNly4  
 tdc.SelectObject(pOld); !O+) sbd<  
 BITMAP btm; "cE7 5  
 bm.GetBitmap(&btm); dsb`xw  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^=BTz9QM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 63q^ $I  
 BITMAPINFOHEADER bih; ]e"=$2d$  
 bih.biBitCount=btm.bmBitsPixel; 9Tg IB  
 bih.biClrImportant=0; 'DY`jVwa  
 bih.biClrUsed=0; CY 4gSe?  
 bih.biCompression=0; R@58*c:U(  
 bih.biHeight=btm.bmHeight; w j*,U~syB  
 bih.biPlanes=1; Jj>?GAir  
 bih.biSize=sizeof(BITMAPINFOHEADER); NO7J!k?  
 bih.biSizeImage=size; r@72|:,  
 bih.biWidth=btm.bmWidth; Ed0QQyC@9  
 bih.biXPelsPerMeter=0; ^ZvWR%  
 bih.biYPelsPerMeter=0; sv: 9clJ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); nno}e/zqf  
 static int filecount=0; hv`~?n)D66  
 CString name; N|8P)  
 name.Format("pict%04d.bmp",filecount++); 9v;Vv0k_  
 name=m_Path+name; Od)Uv1  
 BITMAPFILEHEADER bfh; qW$<U3u}  
 bfh.bfReserved1=bfh.bfReserved2=0; <6EeD5{*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :By?O"LQ  
 bfh.bfSize=54+size; L6t+zIUc-~  
 bfh.bfOffBits=54; Vi>,kF.f V  
 CFile bf; TTeH `  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8;d:-Cp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W3]_m8,Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8qk?E6  
  bf.WriteHuge(lpData,size); .GsV>H  
  bf.Close(); m;H.#^b*  
  nCount++; X@$f$=  
 } j2Cks_$:  
 GlobalFreePtr(lpData); (n*^4@"2  
 if(nCount==1) > A Khf  
  m_Number.Format("%d picture captured.",nCount); $Z!`Hb  
 else ~qcNEl\-y  
  m_Number.Format("%d pictures captured.",nCount); NaPt"G  
  UpdateData(FALSE); ;9[fonk  
} <LmIK  
O}+.U<V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) NO~*T?&  
{ T_i:}ul  
 if(pMsg -> message == WM_KEYDOWN) $*SW8'],`  
 { AJf4_+He  
  if(pMsg -> wParam == VK_ESCAPE) 00G%gQXk,  
   return TRUE; S/}2;\Xm  
  if(pMsg -> wParam == VK_RETURN) gwOa$f%O  
   return TRUE; E=jNi  
 } 8qY79)vD4E  
 return CDialog::PreTranslateMessage(pMsg); %b%-Ogz;4  
} >z/#_z@LV  
r;B8i!gD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \.C +ue  
{ TlXI|3Ip  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B:dB,3,`(  
  SaveBmp(); 'z0:Ccbj  
  return FALSE; sR(9IW-  
} 1 9&<|qTz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ j.C`U(n}`  
 CMenu pop; :9O#ObFR  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {E p0TVj`  
 CMenu*pMenu=pop.GetSubMenu(0); A'j;\ `1  
 pMenu->SetDefaultItem(ID_EXITICON); 52Sa KA[  
 CPoint pt; cWEE%  
 GetCursorPos(&pt); f*!j[U/r_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =q>'19^Jx  
 if(id==ID_EXITICON) >/:" D$  
  DeleteIcon(); JI?rL  
 else if(id==ID_EXIT) I, -hf=-  
  OnCancel(); VLS0XKI)  
 return FALSE; ;Yx)tWQI  
} 8}c$XmCM  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?{\nf7Y  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^$%S &W  
 AddIcon(); Ky|88~}:C9  
 return res; 8I-u2Y$Sr  
} `NnUyQ;T  
:j5n7s?&=y  
void CCaptureDlg::AddIcon() o 4`hY/<t  
{ 0)%YNaskj  
 NOTIFYICONDATA data; P<PJ)>  
 data.cbSize=sizeof(NOTIFYICONDATA); $$D}I*^Dt  
 CString tip; +awW3^1Ed  
 tip.LoadString(IDS_ICONTIP); Da&vb D-Bg  
 data.hIcon=GetIcon(0); ,LTH;<zB)  
 data.hWnd=GetSafeHwnd(); VGfMN|h  
 strcpy(data.szTip,tip); @x9a?L.48  
 data.uCallbackMessage=IDM_SHELL; 0Oi,#]F  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P7J>+cm  
 data.uID=98; {FO;Yg'  
 Shell_NotifyIcon(NIM_ADD,&data); E'v _#FLvR  
 ShowWindow(SW_HIDE); {kp-h2I,  
 bTray=TRUE; %u`8minCt  
} J1/?JfF  
BHd&yIyI  
void CCaptureDlg::DeleteIcon() k ]W[`  
{ GT~)nC9f  
 NOTIFYICONDATA data; ZtV9&rd7  
 data.cbSize=sizeof(NOTIFYICONDATA); ]Oh@,V8  
 data.hWnd=GetSafeHwnd(); <p}R~zk  
 data.uID=98; aHs^tPg  
 Shell_NotifyIcon(NIM_DELETE,&data); {n(b{ ibl  
 ShowWindow(SW_SHOW); ;6gDV`Twy  
 SetForegroundWindow(); j Yx38_5e  
 ShowWindow(SW_SHOWNORMAL); -#0qV:D  
 bTray=FALSE; tna .52*/  
} @xQgY*f#  
*n; !G8\  
void CCaptureDlg::OnChange() wQv'8A_}  
{ $@sEn4h  
 RegisterHotkey(); aY3^C q(r  
} 6$fHtJD:  
m*ISa(#(,  
BOOL CCaptureDlg::RegisterHotkey() ]P#XVDn+;  
{ H70LhN  
 UpdateData(); 8j Mk)-  
 UCHAR mask=0; H]Cy=Zi"  
 UCHAR key=0; P6E3-?4j  
 if(m_bControl) &/mA7Vf>eR  
  mask|=4; nS/)P4z  
 if(m_bAlt) d1T,eJ}  
  mask|=2; x HoKo  
 if(m_bShift) W [Of|?  
  mask|=1; / rg*p  
  key=Key_Table[m_Key.GetCurSel()]; ]NjX?XdX<  
 if(bRegistered){ O>SLOWgha  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x6(~;J  
  bRegistered=FALSE; t]>Lh>G  
 } &Q+Ln,(&L  
 cMask=mask; z|=}1; (.  
 cKey=key; kV?y0J.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9w"h  
 return bRegistered; MA;1 ;uI,  
} U2{ dN>  
Z&ZP"P4  
  四、小结 =NOH:#iQ  
[OHxonU  
  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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