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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: _x:K%1_[  
  ve>8vw2  
  一、实现方法 Sy8Og] a  
"z qt'b0bW  
  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: R; IB o  
gDA hl  
#pragma data_seg("shareddata") yXkgGY5  
HHOOK hHook =NULL; //钩子句柄 X`22Hf4ct  
UINT nHookCount =0; //挂接的程序数目 Q8P;AN_JS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 !?KY;3L:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x|Q6[Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3Y=S^*ztd  
static int KeyCount =0; Obw uyhjQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =]D##R  
#pragma data_seg() '; qT  
Hv%a\WNS1  
  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。 & MAIm56~  
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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: H kg0;)  
M+ H$Jjcs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $1w8GI\J  
cKey,UCHAR cMask) $[z*MQ  
{ 'SuYNA)  
 BOOL bAdded=FALSE; 1sgoT f%  
 for(int index=0;index<MAX_KEY;index++){ &)wQ|{P~k  
  if(hCallWnd[index]==0){ v7g-M  
   hCallWnd[index]=hWnd; QN0Ik 2L  
   HotKey[index]=cKey; #$8tBo  
   HotKeyMask[index]=cMask; y(q1~73s  
   bAdded=TRUE; ]CTu |  
   KeyCount++; #-@dc  
   break; K%Rx5 S  
  } ' rXkTm1{  
 } r^]0LJ  
 return bAdded; &^z~wJ,]  
} G;tIhq[$Vb  
//删除热键 YAO.Ccz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 44n^21k  
{ uD+;5S]us  
 BOOL bRemoved=FALSE; V57^0^Zp`  
 for(int index=0;index<MAX_KEY;index++){ MRiETd"  
  if(hCallWnd[index]==hWnd){ lfCoL@$6D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;KnnAZJ  
    hCallWnd[index]=NULL; )[/+j"F   
    HotKey[index]=0; ov?>ALRg  
    HotKeyMask[index]=0; 7=JiL=  
    bRemoved=TRUE; -]N/P{=L  
    KeyCount--; $ biCm$a  
    break; vuD tEz  
   } "F0,S~tZZ  
  } hLBX,r)u  
 } }|x]8zL8G  
 return bRemoved; 6 Iup4sP  
} d,$[633It}  
Rk"_4zJk  
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  DLL中的钩子函数如下: 398%16}  
R|Ykez!D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x; :[0(st}  
{ ZY {,//  
 BOOL bProcessed=FALSE; m!v`nw]  
 if(HC_ACTION==nCode) f^nogw<z!  
 { iS02uVmBZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Mq6"7L  
   switch(wParam) ~uV.jh  
   {  YKj7~yK?  
    case VK_MENU: 4,uH 4[7  
     MaskBits&=~ALTBIT; \+ K ^G  
     break; 4F/Q0"  
    case VK_CONTROL: In]h+tG?rN  
     MaskBits&=~CTRLBIT; pnVtjWrbG  
     break; IspY%UMl  
    case VK_SHIFT: Rg' 1 F  
     MaskBits&=~SHIFTBIT; / EWF0XV!  
     break; #O G_O I  
    default: //judge the key and send message 1!,lI?j,  
     break; Ib]{rmaP  
   } 84|Hn|4t  
   for(int index=0;index<MAX_KEY;index++){ D @T,j4o  
    if(hCallWnd[index]==NULL) #Mi>f4T;  
     continue; \Q]2Zq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1 aIJ0#nE  
    { TVYO`9:CW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?. CA9!|   
     bProcessed=TRUE; @| r*yi  
    } 1)M3*h3  
   } L{osh0  
  } 6 70g|&v.  
  else if((lParam&0xc000ffff)==1){ //有键按下 Pgb<;c:4  
   switch(wParam) 1P&c:n  
   { R$NH [Tz  
    case VK_MENU: WCU[]A  
     MaskBits|=ALTBIT; z]~B@9l  
     break; YpXUYNy  
    case VK_CONTROL: w0VJt<e*  
     MaskBits|=CTRLBIT; YI&7s_% -  
     break; 389T6sP]  
    case VK_SHIFT: irpO(>LK  
     MaskBits|=SHIFTBIT; 5,;{<\c  
     break; ll73}v  
    default: //judge the key and send message @yqy$I   
     break; |fq1Mn8  
   } N!aV~\E  
   for(int index=0;index<MAX_KEY;index++){ E WOn"   
    if(hCallWnd[index]==NULL) &QLCij5:  
     continue; hG; NJx-=R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F< Qjoaz  
    { ~%(r47n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 61b,+'-  
     bProcessed=TRUE; MiAXbo#\  
    } eRv3qK{`  
   } cKdy)T%;  
  } ~cQP4 kBD]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i$$\}2m{L  
   for(int index=0;index<MAX_KEY;index++){ >\[sNCkf  
    if(hCallWnd[index]==NULL) ^o65sM  
     continue; wE;??'O'l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @C7#xGD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,NPU0IDG>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 2r<UYB  
   } K4snp u hC  
  } GAEz :n  
 } vNHM e{,u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +u:8#!X$RD  
} 'l)@MX bGL  
?}bSQ)b  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: WUMx:a0!  
x]J{EA{+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XBdC/DM[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); No!P?  
y2o?a6`  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: !nC Z,  
B$_F)2%m;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l&^9<th  
{ DTI+VY .W^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^s_E|~U  
 { _|x%M}O},  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %t`a-m  
  SaveBmp(); coiTVDwA  
  return FALSE; j"yL6Q9P  
 } S\MD]>4  
 …… //其它处理及默认处理 LX!16a@SxA  
} -;_NdL@  
+TfMj1Zx  
WQ|d;[E  
  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。 lKxv SyD  
hnmFhJ !g  
  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。 Fu(e4E  
&l-g3l[  
  二、编程步骤 4cTJ$" v  
0`3ey*  
  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"; &W)k s  
Z#3wMK~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *<OWd'LI  
w[n|Sauy,  
  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; p$0;~1vH  
6WzE'0Nyr  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; VgN`' iC`I  
VABrw t  
  5、 添加代码,编译运行程序。 gh['T,  
 QSmE:Y  
三、程序代码 *B#<5<T  
,iB)8Km@U  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [="moh2*f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) GL.& g{$#+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ kS[k*bN0  
#if _MSC_VER > 1000 pzCD' !*  
#pragma once _Oh;._PS  
#endif // _MSC_VER > 1000 _|g(BK2}  
#ifndef __AFXWIN_H__ Xa Yx avq  
#error include 'stdafx.h' before including this file for PCH >OBuHqC  
#endif U3&*,xeU@H  
#include "resource.h" // main symbols I^qk`5w  
class CHookApp : public CWinApp /1gKc}rB2  
{  7=6p  
 public: VQ$=F8ivG  
  CHookApp(); mdoy1a  
  // Overrides D-8%lGS  
  // ClassWizard generated virtual function overrides ouPwhB,bg  
  //{{AFX_VIRTUAL(CHookApp) ~i=/@;wRp  
 public: Q{0-pHr}  
  virtual BOOL InitInstance(); ZL+{?1&-  
  virtual int ExitInstance(); Wu2#r\  
  //}}AFX_VIRTUAL T=A7f6`  
  //{{AFX_MSG(CHookApp) LrsP4G  
  // NOTE - the ClassWizard will add and remove member functions here. 7?]gUrE  
  // DO NOT EDIT what you see in these blocks of generated code ! jcYI"f"~  
  //}}AFX_MSG :2 n5;fp  
  DECLARE_MESSAGE_MAP() [64K?l0&  
}; C;OU2,c,T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); tv,^ Q}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YL;ZZ2A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @lc1Ipfk"  
BOOL InitHotkey(); X.o[=E  
BOOL UnInit(); VjMd&>G  
#endif fFqK.^Tn  
.]k(7F!W  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %Jq(,u  
#include "stdafx.h" q}M^i7IE  
#include "hook.h" C' o4Su#  
#include <windowsx.h> 3Nsb@0  
#ifdef _DEBUG Ni(D[?mZ  
#define new DEBUG_NEW K}1>n2P  
#undef THIS_FILE tPDV"Md#m<  
static char THIS_FILE[] = __FILE__; !Z<GUbl t  
#endif 'N,x=1R5  
#define MAX_KEY 100 )tz8(S  
#define CTRLBIT 0x04 Y~,[9:SR  
#define ALTBIT 0x02 XqyfeY5t  
#define SHIFTBIT 0x01 VCX})sp  
#pragma data_seg("shareddata") 0d9rJv}~  
HHOOK hHook =NULL; \@*cj8e  
UINT nHookCount =0; RIC'JLWQ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &dbX>u q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6(ju!pE`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /7h}_zs6  
static int KeyCount =0; n 'ZlIh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift c5mv4 MC  
#pragma data_seg() &pZ]F=.r+  
HINSTANCE hins; Zdr +{-  
void VerifyWindow(); U@BVVH?,o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <*3wnpj_  
//{{AFX_MSG_MAP(CHookApp) < ;Qle  
// NOTE - the ClassWizard will add and remove mapping macros here. n?YGX W/  
// DO NOT EDIT what you see in these blocks of generated code! ]Q6,,/nn  
//}}AFX_MSG_MAP Q5Y4@  
END_MESSAGE_MAP() k#5S'sCF<  
Rdwr?:y(]  
CHookApp::CHookApp() &rq7;X  
{ pE^LQi  
 // TODO: add construction code here, oHxaa>C>  
 // Place all significant initialization in InitInstance 1mFc]1W  
} $gJMF(  
Y xGIv8O]  
CHookApp theApp; !MTm4Ls  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AZI%KM[  
{ pn{.oXomf  
 BOOL bProcessed=FALSE; $qP9EZ]JC  
 if(HC_ACTION==nCode) s,]6Lri`\  
 { nC_<pq^tr  
  if((lParam&0xc0000000)==0xc0000000){// Key up  vF]?i  
   switch(wParam) ,HUs MCXQ  
   { b3#c0GL  
    case VK_MENU: :>F:G%(DK  
     MaskBits&=~ALTBIT; 85w D<bN27  
     break; |uj1T=ZY  
    case VK_CONTROL: DS=kSkW^&5  
     MaskBits&=~CTRLBIT; ~ Y4H)r  
     break; h:a5FK@  
    case VK_SHIFT: 8p-5.GU)<e  
     MaskBits&=~SHIFTBIT; R+]Fh4t  
     break; P-7!\[];te  
    default: //judge the key and send message wAF>C[<\  
     break; 96}/;e]@  
   } `w[0q?}"`  
   for(int index=0;index<MAX_KEY;index++){ FGy7KVR  
    if(hCallWnd[index]==NULL) AWh{dM  
     continue; m&Ms[X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qWw@6VvoQ  
    { "h2;65@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6Ck?O/^  
     bProcessed=TRUE; dK|MQ <  
    } [0m'a\YE9  
   } o:f=dBmoX  
  } 7M3q|7 ?  
  else if((lParam&0xc000ffff)==1){ //Key down ^ }U{O A  
   switch(wParam) : b $ M  
   { ;yBq'_e3  
    case VK_MENU: Y 0$m~}j  
     MaskBits|=ALTBIT; wD22@uM#]  
     break; rnmWw#  
    case VK_CONTROL: H+zQz8zMC  
     MaskBits|=CTRLBIT; O JvEq@  
     break; uLe+1`Y5Ux  
    case VK_SHIFT: dbB2/RI  
     MaskBits|=SHIFTBIT; hy W4=  
     break; 4JU#3  
    default: //judge the key and send message RNl%n}   
     break; s ~(qO|d  
   } zw\"!=r^  
   for(int index=0;index<MAX_KEY;index++) v:JFUn}  
   { \@MGO aR]  
    if(hCallWnd[index]==NULL) +\"@2mOH{+  
     continue; WuSRA<{P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o1GWcxu*\  
    { }{=%j~V;&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qW;nWfkYC  
     bProcessed=TRUE; gA" =so  
    } UrN$nhH  
   } >Q[]i4*A  
  } ;#~rd8Z52  
  if(!bProcessed){ hCQ{D|/  
   for(int index=0;index<MAX_KEY;index++){ q'C'S#qqn  
    if(hCallWnd[index]==NULL) q^"P_pV\  
     continue; -S)HB$8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :bLGDEC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S9U9;>g  
   } k(u W( 6  
  } Y($"i<rN  
 } /e4hB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Qy0bp;V/  
} !%T@DT=l&  
&b"PjtU.X  
BOOL InitHotkey() /5U?4l(6[f  
{ /3FC@?l w4  
 if(hHook!=NULL){ 5IVASqYp  
  nHookCount++; r[EN`AxDb  
  return TRUE; <0JW[m  
 } <9\_b 6  
 else zh*NRN  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hh:0m\@<  
  if(hHook!=NULL) _Xsn1  
   nHookCount++; i"Ct}7i  
  return (hHook!=NULL); "W\ #d  
} &NHIX(b6  
BOOL UnInit() D2>=^WP6+  
{ e)cmZ8~S  
 if(nHookCount>1){ w`F}3zm  
  nHookCount--; top3o{ 4  
  return TRUE; EBK\.[  
 } Zt[ P kBi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4A|5eg9N  
 if(unhooked==TRUE){ \-V  
  nHookCount=0; TQID-I  
  hHook=NULL; `A&64D  
 } XImb"7|  
 return unhooked; xQWZk`6~L  
} `4\H'p  
]#3=GFs/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ms{v;fT  
{ -_b}b)2iYN  
 BOOL bAdded=FALSE; 42Kzdo|}  
 for(int index=0;index<MAX_KEY;index++){ @105 @9F  
  if(hCallWnd[index]==0){ CIO&VK  
   hCallWnd[index]=hWnd; r IS \#j  
   HotKey[index]=cKey; ~y B[}BPf  
   HotKeyMask[index]=cMask; pZjyzH{~  
   bAdded=TRUE; ,((5|MbM/  
   KeyCount++; >qcir~ &  
   break; iCc@N|~  
  } K<Iz5+oD  
 } A3Ltk 2<  
 return bAdded; ``>WFLWTn  
} Bz /NFNi[p  
`(*5yXC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a)y8MGx?  
{ /oe="/y6  
 BOOL bRemoved=FALSE; b*?="%eE(  
 for(int index=0;index<MAX_KEY;index++){ sNS! /  
  if(hCallWnd[index]==hWnd){  '=%vf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $Iqt c)DA  
    hCallWnd[index]=NULL; T][\wyLx1  
    HotKey[index]=0; Q\ro )r  
    HotKeyMask[index]=0; 33"{"2==`  
    bRemoved=TRUE; B1*%pjy  
    KeyCount--; "xnek8F  
    break; a&PoUwG  
   } (Ozb+W?  
  } L7a+ #mGE  
 } H'Z[3e  
 return bRemoved; T'f E4}rY  
} P9X/yZ42  
^[^uDE <  
void VerifyWindow() =0x[Sa$&,  
{ )0qXZ gs  
 for(int i=0;i<MAX_KEY;i++){ VPtA %1  
  if(hCallWnd!=NULL){ ;uR8pz e  
   if(!IsWindow(hCallWnd)){ Yx XDRb\kW  
    hCallWnd=NULL; 78}iNGf  
    HotKey=0; 7<-D_$SrU  
    HotKeyMask=0; X Uh)z  
    KeyCount--; O6k[1C  
   } HYW+,ts'  
  } 1Voo($q.  
 } j_p.KF'[?  
} d~GT w:  
nCXIWLw  
BOOL CHookApp::InitInstance() o?/N4$&5l  
{ 9Z7o?S";  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [4t_ 83  
 hins=AfxGetInstanceHandle(); f[h=>O  
 InitHotkey(); =We}&80 x  
 return CWinApp::InitInstance(); n# Z6d`  
} U/|B IF  
 LDwu?"P!  
int CHookApp::ExitInstance() j0:F E  
{ ~mmI] pC  
 VerifyWindow(); 0+cRUH9Ew  
 UnInit(); vEn12s(lj  
 return CWinApp::ExitInstance();  {l_R0  
} 4/Ok/I  
%# J8cB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |Q.?<T:wt=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /$I&D}uR`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F N(&3Ull  
#if _MSC_VER > 1000  ,ulTZV  
#pragma once Xo{Ce%L  
#endif // _MSC_VER > 1000 q'q'v S  
*A c~   
class CCaptureDlg : public CDialog nSgg'I(  
{ Y:*mAv;&  
 // Construction 9OXrz}8C  
 public: shnfH   
  BOOL bTray; HT kce,dQ  
  BOOL bRegistered; Oh<Z0M)  
  BOOL RegisterHotkey(); ~''qd\.f$  
  UCHAR cKey; '2:Ily,S@  
  UCHAR cMask; }6m5MH$7q  
  void DeleteIcon(); >nvreis  
  void AddIcon(); $0iz;!w  
  UINT nCount; URJ"  
  void SaveBmp(); "wexG]R=5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &&JI$x0;  
  // Dialog Data Y6^lKw  
  //{{AFX_DATA(CCaptureDlg) (WN'wp  
  enum { IDD = IDD_CAPTURE_DIALOG }; >2>xr"  
  CComboBox m_Key; 5 BcuLRId:  
  BOOL m_bControl; fIWQ+E  
  BOOL m_bAlt; %>5Ht e<  
  BOOL m_bShift; = eTI@pN`  
  CString m_Path; +apIp(E+  
  CString m_Number; "LXLUa03  
  //}}AFX_DATA My_fm?n  
  // ClassWizard generated virtual function overrides 4ol=YGCI_  
  //{{AFX_VIRTUAL(CCaptureDlg) k]; <PF  
 public: sks_>BM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >i@gR  
 protected: k 2;m"F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A 7DdUNR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l_^>spF  
  //}}AFX_VIRTUAL Z0`?  
  // Implementation gjyg`%  
 protected: ]WyV~Dzz<  
  HICON m_hIcon; eQ9{J9)?  
  // Generated message map functions ;$[o7Qm5r  
  //{{AFX_MSG(CCaptureDlg) U|U/B  
  virtual BOOL OnInitDialog(); fa5($jJ&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hO{@!H$l  
  afx_msg void OnPaint(); bp$8hUNYz-  
  afx_msg HCURSOR OnQueryDragIcon(); alHwN^GhP  
  virtual void OnCancel(); o)S>x0| [  
  afx_msg void OnAbout(); $V`O%Sz  
  afx_msg void OnBrowse(); Ldir'FW  
  afx_msg void OnChange(); B>a`mFM  
 //}}AFX_MSG ]~kqPw<R  
 DECLARE_MESSAGE_MAP() b39;Sv|#  
}; >k_Z]J6Pd  
#endif !v`q%JW(  
 s.GTY@t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  w8FZXL  
#include "stdafx.h" TSHp.ABf  
#include "Capture.h" ] ^  
#include "CaptureDlg.h" D8[&}D4  
#include <windowsx.h> ?ADk`ts~,}  
#pragma comment(lib,"hook.lib") 1T}|c;fc  
#ifdef _DEBUG +".&A#wU  
#define new DEBUG_NEW 3%|<U51  
#undef THIS_FILE r=&PUT+vt  
static char THIS_FILE[] = __FILE__; X<-]./  
#endif F)DL/';  
#define IDM_SHELL WM_USER+1 Av+ w>~/3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B*DH^";t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qc*+;Wi+5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rw+0<r3|K  
class CAboutDlg : public CDialog ]*zF#Voc  
{ mjs*Z{_F^  
 public: 2$1rS}}  
  CAboutDlg(); Ej.D!@   
  // Dialog Data :nZ*x=aq  
  //{{AFX_DATA(CAboutDlg) 0Vy* 0\{S  
  enum { IDD = IDD_ABOUTBOX }; j#!J hi  
  //}}AFX_DATA s/ZOA[Yux  
  // ClassWizard generated virtual function overrides fCEd :Kr  
  //{{AFX_VIRTUAL(CAboutDlg) _}JygOew  
 protected: G ROl9xp2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b[RBp0]x  
  //}}AFX_VIRTUAL ;?n*w+6<  
  // Implementation y)(SS8JR  
 protected: A9tQb:  
  //{{AFX_MSG(CAboutDlg) \N"K^kR4  
  //}}AFX_MSG BA t2m-  
  DECLARE_MESSAGE_MAP() VT'$lB%IK  
}; D4o?  
;iS}<TA  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zh50]tX  
{ R 8Iac[N  
 //{{AFX_DATA_INIT(CAboutDlg) ~{d94o.  
 //}}AFX_DATA_INIT \19XDqf8  
} N?87Bd  
G]&:">&R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9 lA YCsX  
{ U*a!Gn7l  
 CDialog::DoDataExchange(pDX); ={feN L  
 //{{AFX_DATA_MAP(CAboutDlg) k5}i^^.  
 //}}AFX_DATA_MAP !uHI5k,f  
} VQo7 se1P  
%Yd}},X_E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Y{p *$  
 //{{AFX_MSG_MAP(CAboutDlg) AA05wpu8  
 // No message handlers \uanQ|Nu  
 //}}AFX_MSG_MAP F7"Ihb^l  
END_MESSAGE_MAP() Gl1`Nx0  
J`"1DlH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dYr#  
: CDialog(CCaptureDlg::IDD, pParent) lfI[r|  
{ -@J;FjrXmP  
 //{{AFX_DATA_INIT(CCaptureDlg) c[",WB<9  
  m_bControl = FALSE; cUy6/x9&  
  m_bAlt = FALSE; Yn I   
  m_bShift = FALSE; da[l[b;  
  m_Path = _T("c:\\"); sDbALAp +  
  m_Number = _T("0 picture captured."); _0vXujz  
  nCount=0; Hs-NP#I  
  bRegistered=FALSE; _n{N3da  
  bTray=FALSE; j83p[qR7o  
 //}}AFX_DATA_INIT G_AAE#r`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 }#yRa Ip  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;W+.]_$6)T  
} w"l8M0$m  
spe9^.SI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <D4)gRRo  
{ +Z{ 4OJK  
 CDialog::DoDataExchange(pDX); T>?sPq  
 //{{AFX_DATA_MAP(CCaptureDlg) 7rhpIP2n  
  DDX_Control(pDX, IDC_KEY, m_Key); hc[GpZcw,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~i  &K,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Y%&6qt G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); XriVHb  
  DDX_Text(pDX, IDC_PATH, m_Path); cAktSoF  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^kXDEKm  
 //}}AFX_DATA_MAP y*7ht{B  
} :fj}J)9'xW  
; 9'*w=V  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vys*=48g  
//{{AFX_MSG_MAP(CCaptureDlg) <!w-op2@ir  
 ON_WM_SYSCOMMAND() 9r8{9h:  
 ON_WM_PAINT()  j, G/[V  
 ON_WM_QUERYDRAGICON() YJ75dXc&&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ueWG/`ig  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %[p[F~Z^Z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c6lEWC:  
//}}AFX_MSG_MAP kbMIMZC/G  
END_MESSAGE_MAP() gE$dz#t.  
L>@6lhD)x  
BOOL CCaptureDlg::OnInitDialog() 3\'.1p  
{ h hd n9n  
 CDialog::OnInitDialog(); @Qx;J<{+g  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,cm2uY  
 ASSERT(IDM_ABOUTBOX < 0xF000); W)9KYI9u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @u$oqjK  
 if (pSysMenu != NULL) <B`=oO%o  
 { ?Rl*5GRW  
  CString strAboutMenu; iSsy_ |  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <R !qOQI  
  if (!strAboutMenu.IsEmpty()) Hh qx)u  
  { + S%+Ku  
   pSysMenu->AppendMenu(MF_SEPARATOR); iT|+<h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -)$)<k  
  } <`N\FM^vo  
 } @:c 1+  
 SetIcon(m_hIcon, TRUE); // Set big icon I H:Hf v  
 SetIcon(m_hIcon, FALSE); // Set small icon AN.`tv  
 m_Key.SetCurSel(0); 2ag]p  
 RegisterHotkey(); c}{e,t  
 CMenu* pMenu=GetSystemMenu(FALSE); VKs$J)6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); UW>~C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tSO F7N/<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S`*al<m  
 return TRUE; // return TRUE unless you set the focus to a control 'Lm.`U  
} 5Y,e}+I>  
F]ALZxwkz  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gVI*`$  
{ -m+2l`DLy  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q5jP`<zWU  
 { Z]Qm64^I  
  CAboutDlg dlgAbout; Y@r#:BH )  
  dlgAbout.DoModal(); o 86}NqK  
 } kv'n W  
 else [6-l6W  
 { AX1\L |tJS  
  CDialog::OnSysCommand(nID, lParam); fI BLJ53  
 } cJhf{{_oR  
} lv\2vRYw-  
Q% dpGI  
void CCaptureDlg::OnPaint() RL&*.r&  
{ KlrKGmy,)  
 if (IsIconic()) N.&K"J  
 { w1GCjD*y  
  CPaintDC dc(this); // device context for painting ;nC+K z:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J%[K;WjrZJ  
  // Center icon in client rectangle WUHx0I  
  int cxIcon = GetSystemMetrics(SM_CXICON); p(U'Ydl~  
  int cyIcon = GetSystemMetrics(SM_CYICON); n&Al~-Q:^  
  CRect rect; kKjYMYT6  
  GetClientRect(&rect); /`'50C j  
  int x = (rect.Width() - cxIcon + 1) / 2; fO:*85 %}7  
  int y = (rect.Height() - cyIcon + 1) / 2; zY#U]Is  
  // Draw the icon ^QnVYTM  
  dc.DrawIcon(x, y, m_hIcon); %`}Qkb/Lyh  
 } wIY#TBu  
 else !W3Le$aL  
 { -bj1y2)n  
  CDialog::OnPaint(); D'2O#Rj4q  
 } Vl'=92t  
} tRXM8't   
l'o}4am  
HCURSOR CCaptureDlg::OnQueryDragIcon() P/ y-K0u  
{ ^X_%e|  
 return (HCURSOR) m_hIcon; )Z^( +  
} -9Can4  
w6cPd'  
void CCaptureDlg::OnCancel() _WSJg1  
{ bqe;) A7  
 if(bTray) lLg23k{'  
  DeleteIcon(); yV]-![`D  
  CDialog::OnCancel(); 2.NzB7c*CM  
} r@!~l1$s`  
a v`eA`)S  
void CCaptureDlg::OnAbout() Z>D7C?v:(  
{ bh_ALu^CSX  
 CAboutDlg dlg; )q=1<V44d  
 dlg.DoModal(); Ti'O 2k  
} &R8zuD`#  
OE[/sv  
void CCaptureDlg::OnBrowse() zO+nEsf^O  
{ Z os~1N]3  
 CString str; )WFUAzuN,  
 BROWSEINFO bi; \u)(+t{  
 char name[MAX_PATH]; 6 =kd4'yV  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]c5Shj5|p  
 bi.hwndOwner=GetSafeHwnd(); -\I0*L'$|\  
 bi.pszDisplayName=name; L8$7^muad  
 bi.lpszTitle="Select folder"; sVC5<?OW!p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @ J"1 !`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .:;i*  
 if(idl==NULL) ktS0  
  return; J[B8sa  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bX9}G#+U  
 str.ReleaseBuffer(); KcrF=cA  
 m_Path=str; o/[NUQSI  
 if(str.GetAt(str.GetLength()-1)!='\\') &/ zs Ix+  
  m_Path+="\\"; L3W ^ip4  
 UpdateData(FALSE); AI)9E=D%  
} dE^'URBiA  
NKMB,b  
void CCaptureDlg::SaveBmp() wHY;Y-(ZT  
{ e)iVX<qb  
 CDC dc; u.arkp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  /!9949XV  
 CBitmap bm; t=pG6U  
 int Width=GetSystemMetrics(SM_CXSCREEN); #uH1!UQb  
 int Height=GetSystemMetrics(SM_CYSCREEN); HD`%Ma Yhc  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I#mT#xs6  
 CDC tdc; 7 yi>G  
 tdc.CreateCompatibleDC(&dc); *&U9npN  
 CBitmap*pOld=tdc.SelectObject(&bm); T0SD|'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "RG.vo7b  
 tdc.SelectObject(pOld); &{ f5F7E@  
 BITMAP btm; FIS-xpv$  
 bm.GetBitmap(&btm); ~pw_*AN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; "~Eo=R0O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |[: `izW  
 BITMAPINFOHEADER bih; }8FP5Z'Cf%  
 bih.biBitCount=btm.bmBitsPixel; +&t{IP(?  
 bih.biClrImportant=0; ?ph"|LyL  
 bih.biClrUsed=0; 2T|L# #C  
 bih.biCompression=0; Fdzd!r1 v  
 bih.biHeight=btm.bmHeight; # ._!.P  
 bih.biPlanes=1; ybB}|4d&   
 bih.biSize=sizeof(BITMAPINFOHEADER); Z>{8FzP.F  
 bih.biSizeImage=size; cg$~.ytPK  
 bih.biWidth=btm.bmWidth; %TR->F  
 bih.biXPelsPerMeter=0; 8"4`W~ 3  
 bih.biYPelsPerMeter=0; H(g&+Wcu=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); T"0a&.TLj  
 static int filecount=0; 9!R!H&  
 CString name; cis ~]x%  
 name.Format("pict%04d.bmp",filecount++); 0 @ ,@  
 name=m_Path+name; d-  ]%  
 BITMAPFILEHEADER bfh; YnNei 7R  
 bfh.bfReserved1=bfh.bfReserved2=0; xqG` _S l  
 bfh.bfType=((WORD)('M'<< 8)|'B'); (V+(\<M  
 bfh.bfSize=54+size; -Rf|p(SJ,E  
 bfh.bfOffBits=54; adxJA}K}  
 CFile bf; bEy%S "\<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <n#JOjHV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); JD'/m hN0  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !k[ zUti  
  bf.WriteHuge(lpData,size); M 35}5+  
  bf.Close(); 6qw_|A&g  
  nCount++; [Y:HVr,  
 } k"n#4o:  
 GlobalFreePtr(lpData); e;gf??8}  
 if(nCount==1) )pzXC  
  m_Number.Format("%d picture captured.",nCount); BkC(9[Ei  
 else ``O\'{o&  
  m_Number.Format("%d pictures captured.",nCount); 3 $RII -}>  
  UpdateData(FALSE); 5= F-^  
} u}$U|Cw-;T  
p@^2 .O+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y /w vn8~C  
{ jRBx7|ON  
 if(pMsg -> message == WM_KEYDOWN) (* 2"dd  
 { x~(Ul\EX  
  if(pMsg -> wParam == VK_ESCAPE) U?}Maf  
   return TRUE; +wio:==  
  if(pMsg -> wParam == VK_RETURN) ?Z.YJXoKZ  
   return TRUE; JlH|=nIaj6  
 } XM)|v |  
 return CDialog::PreTranslateMessage(pMsg); fW\u*dMMZE  
} 'DIE#l`  
85X^T]zo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5 )C~L]  
{ TS%cTh'ItH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hgh1G7A&  
  SaveBmp(); 0zfrx-'zN  
  return FALSE; Le}q>>o;q  
} IAtZ-cM<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H;Bj\-Pa  
 CMenu pop; X)|%[aX}q  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BpK P]V  
 CMenu*pMenu=pop.GetSubMenu(0); +\E\&^ZQ  
 pMenu->SetDefaultItem(ID_EXITICON); (+ >n/I6  
 CPoint pt; 3b_#xr-  
 GetCursorPos(&pt); ]>:>":<:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LZ@^ A]U  
 if(id==ID_EXITICON) }^iE|YKz  
  DeleteIcon(); B 51LZP  
 else if(id==ID_EXIT) kiECJ@5p  
  OnCancel(); NR3IeTd  
 return FALSE; )-sEm`(`I9  
} vdo[qk\C  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \k* ]w_m-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Pgo5&SQb  
 AddIcon(); R52!pB0[  
 return res; Eod2vr =Q  
} oL~Yrb%R  
,`wxXU7  
void CCaptureDlg::AddIcon() ,iHt*SZ,*  
{ g>Z1ZK0;M  
 NOTIFYICONDATA data; <6`,)(dj  
 data.cbSize=sizeof(NOTIFYICONDATA); ?@u &3/&  
 CString tip; R@EFG%|`_  
 tip.LoadString(IDS_ICONTIP); Vt&I[osC  
 data.hIcon=GetIcon(0); *r_.o;6  
 data.hWnd=GetSafeHwnd(); Comu c  
 strcpy(data.szTip,tip); i<T`]g  
 data.uCallbackMessage=IDM_SHELL; eFx*lYjA  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k{;:KW|  
 data.uID=98; 44]ae~@a  
 Shell_NotifyIcon(NIM_ADD,&data); kj[[78  
 ShowWindow(SW_HIDE); U]P;X~$!  
 bTray=TRUE; vD*KJ3(c  
} [;b9'7j'  
a#{a{>  
void CCaptureDlg::DeleteIcon() ;J _d%  
{ J) (pGS@  
 NOTIFYICONDATA data; B[*i}k%i  
 data.cbSize=sizeof(NOTIFYICONDATA); n1LS*-@  
 data.hWnd=GetSafeHwnd(); d`xqs,0f  
 data.uID=98; 65}:2l2<  
 Shell_NotifyIcon(NIM_DELETE,&data); HsXFglQ  
 ShowWindow(SW_SHOW); ''(T3;^ +  
 SetForegroundWindow(); 0 Hq$h  
 ShowWindow(SW_SHOWNORMAL); 9 (&!>z  
 bTray=FALSE; kfHLjr.  
}  "3v%|  
d,>l;l  
void CCaptureDlg::OnChange() V2bod=&Lc  
{ ~:0h o  
 RegisterHotkey(); .=NK^  
} I 7TMv.  
W}e5 4-lu  
BOOL CCaptureDlg::RegisterHotkey() `j2z=5  
{ 6m{3GKaW~  
 UpdateData(); 63~i6  
 UCHAR mask=0; abK/!m[q  
 UCHAR key=0; B^OhL!*tI  
 if(m_bControl) fGxa~Unx  
  mask|=4; WT0U)x( m5  
 if(m_bAlt) b :+ X3  
  mask|=2; B>'\g O\2  
 if(m_bShift) C2VZE~U+  
  mask|=1; abF_i#  
  key=Key_Table[m_Key.GetCurSel()]; L2:C6Sc  
 if(bRegistered){ %URyGS]*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <;Xj4 J  
  bRegistered=FALSE; rUuM__;d  
 } 0lEIj/u  
 cMask=mask; 3j3AI 7c  
 cKey=key; -}>Q0d)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z2ZS5a  
 return bRegistered; c2i^dNp_  
} QTDI^ZeuF  
@Wv*`  
  四、小结 'E@D  
AvwX 2?tc  
  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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