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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: F";FG 0  
  #pu}y,QN$  
  一、实现方法 o =9'  
YsAF{  
  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|#Zy,  
,h!X k  
#pragma data_seg("shareddata") 97x%w]kV  
HHOOK hHook =NULL; //钩子句柄 @}eNV~ROu  
UINT nHookCount =0; //挂接的程序数目 j-* TXog  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %CT!$Y'n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P^(.tr3t  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u33zceE8  
static int KeyCount =0; },6*Y*?{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 J~dTVBx  
#pragma data_seg() fq Y1ggL  
p\+6"28{_~  
  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。 pF='jj51  
@"8~Y|L93  
  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: 8_iHVc;<  
;](h2Z`3s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR m"-G6BKS  
cKey,UCHAR cMask) :r39wFi  
{ l;5`0N?QO  
 BOOL bAdded=FALSE; Uh\]?G[G  
 for(int index=0;index<MAX_KEY;index++){ ;o >WXw  
  if(hCallWnd[index]==0){ @ta?&Qf)  
   hCallWnd[index]=hWnd; m0Z7N5v)  
   HotKey[index]=cKey; "%kG RHq  
   HotKeyMask[index]=cMask; 6S_y%8Fv&[  
   bAdded=TRUE; 0UD"^zgY  
   KeyCount++; r|bPR!0  
   break; {]M>Y%j48  
  } )G4rJ~#@  
 } ;KS`,<^-  
 return bAdded; ZeTL$E[E}  
} FF@`+T  
//删除热键 irmwc'n]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3k{c$x}  
{ &(0N.=R  
 BOOL bRemoved=FALSE; L?.7\a@  
 for(int index=0;index<MAX_KEY;index++){  V IYV92[  
  if(hCallWnd[index]==hWnd){ ux&:Rw\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ) MBS  
    hCallWnd[index]=NULL; k.{G&]r{  
    HotKey[index]=0; }s6G!v^2""  
    HotKeyMask[index]=0; ;/aB)JZ5=  
    bRemoved=TRUE; +3HPA#A  
    KeyCount--; Z~R dFC  
    break; Mz}i[|U\  
   } 54wM8'+  
  } 4ac1m,Jlt  
 } ^yD"d =z  
 return bRemoved; \6LcVik  
} y&3TQ]f\  
%/md"S  
kdd7X bw-  
  DLL中的钩子函数如下: X}?ESjZJ  
@>CG3`?}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R ^^ 1/%  
{ L"9 Gc  
 BOOL bProcessed=FALSE; 1)gv%_  
 if(HC_ACTION==nCode) +/}_%Cf8  
 { !*8#jy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 PAr|1i)mB  
   switch(wParam) .f+9 A>  
   {  /evaTQPz  
    case VK_MENU: X,&xhSzg?  
     MaskBits&=~ALTBIT; {\luieG  
     break; VlV)$z_  
    case VK_CONTROL: < %/:w/  
     MaskBits&=~CTRLBIT; tPzM7 n|  
     break; "& Ff[ O*  
    case VK_SHIFT: 6yp+h  
     MaskBits&=~SHIFTBIT; |zb`&tv}  
     break; sxt`0oE  
    default: //judge the key and send message R;.d/U|av  
     break; &R0OeRToUb  
   } Jtpa@!M  
   for(int index=0;index<MAX_KEY;index++){ \ bC}&Iz6  
    if(hCallWnd[index]==NULL) n)Hk8)^8  
     continue; @n>{&^-c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GA7u5D"0  
    { =;g=GcVK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4 ;^g MI9  
     bProcessed=TRUE; 9ec0^T  
    } v<%]XHN  
   } XEa~)i{O  
  } \N4d_ fPj  
  else if((lParam&0xc000ffff)==1){ //有键按下 `)LIVi"(D  
   switch(wParam) v^;-@ddr  
   { P~o@9RV-  
    case VK_MENU: (}sDm ~;s  
     MaskBits|=ALTBIT; jjYM3LQcdP  
     break; _qEWu Do  
    case VK_CONTROL: { _-wG3f|  
     MaskBits|=CTRLBIT; 9y;y7i{>?  
     break; xp~YIeSg  
    case VK_SHIFT: #i@ACAgn;6  
     MaskBits|=SHIFTBIT; pEY>A_F  
     break; Q;=6ag'  
    default: //judge the key and send message }z8{B3K  
     break; {WIY8B'c  
   } ~@[(U!G  
   for(int index=0;index<MAX_KEY;index++){ 9=H}yiJz  
    if(hCallWnd[index]==NULL) aX:#'eDB  
     continue; jGJ.Pvc>i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;gdi=>S_  
    { S_ZLTcq<1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Al=(sHc'  
     bProcessed=TRUE; G]1(X38[si  
    } "^Y6ctw  
   } }7-7t{G  
  } 7&=-a|k~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sbs[=LW4  
   for(int index=0;index<MAX_KEY;index++){ o?;F.W_  
    if(hCallWnd[index]==NULL) <g] ou YHZ  
     continue; l t&$8jh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) OTnu{<.a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %3ou^mcj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _E3U.mV  
   } <>SR4  
  } Zlr{L]c  
 } xq#U 4E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~6\& y  
} nMTLD  
mx:J>SPA8  
  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: w9/nVu  
>0kmRVd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [0h* &  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xi;/^)r  
dK[*  
  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: ?s1u#'aO  
71JM [2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )3BR[*u*  
{ @TdQZZ}G\x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) v<{wA`'R+  
 { YCirOge  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @47[vhE  
  SaveBmp(); )>-77\  
  return FALSE; Rrh<mo(yj#  
 } m(8jSGV  
 …… //其它处理及默认处理 oNiToFbQu  
} := ]sq}IN  
^fFtI?.6jI  
W`w5jk'0^=  
  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。 A4~D#V  
"PZYgl  
  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。 pESB Il  
(~q#\  
  二、编程步骤 \Oi5=,  
1M7\:te*  
  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"; pg} ~vb"  
!w @1!Xpn1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =Jsg{vI  
P%.`c?olbs  
  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; Uuwq7oFub  
+vSCR (n  
  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; 6{b%Jfo  
-}=@ *See#  
  5、 添加代码,编译运行程序。 _fVh%_oH1  
)?!vJb"  
三、程序代码 3*CzXK>`M&  
7 JxE |G  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Z}sG3p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ):/<H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y_}K?  
#if _MSC_VER > 1000 ,ma Aw}=  
#pragma once ${jA+L<J  
#endif // _MSC_VER > 1000 nQ:ml  
#ifndef __AFXWIN_H__ DQ}_9?3  
#error include 'stdafx.h' before including this file for PCH @4G.(zW  
#endif X{0ax.  
#include "resource.h" // main symbols ZcUh[5:|  
class CHookApp : public CWinApp V-?sek{;  
{ P@gu~!  
 public: 8+*g4=ws  
  CHookApp(); ]&3s6{R  
  // Overrides *%ed;>6:Q  
  // ClassWizard generated virtual function overrides ;J,,f1Vw  
  //{{AFX_VIRTUAL(CHookApp) N+Q(V*:3v  
 public: g\ 8#:@at  
  virtual BOOL InitInstance(); nU=f<]S=  
  virtual int ExitInstance(); "7To c4  
  //}}AFX_VIRTUAL y8<lp+  
  //{{AFX_MSG(CHookApp) S(g<<Te  
  // NOTE - the ClassWizard will add and remove member functions here. "i!2=A8k  
  // DO NOT EDIT what you see in these blocks of generated code ! &LCUoTzj  
  //}}AFX_MSG NZfo`iHAN  
  DECLARE_MESSAGE_MAP() a}5vY  
}; _4~ng#M*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); gp#bQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LU-#=1Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qP7&LtU  
BOOL InitHotkey(); . 1{vpX  
BOOL UnInit(); 1Y H4a|bc  
#endif yDCooX0  
N}8HK^n*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K B`1%=  
#include "stdafx.h" qB+:#Yrx/  
#include "hook.h" ;a!h.8UJPI  
#include <windowsx.h> 5~`|)~FA  
#ifdef _DEBUG IQ(]66c ,  
#define new DEBUG_NEW $Nt=gSWw5  
#undef THIS_FILE 902!M65[rG  
static char THIS_FILE[] = __FILE__; +Op%,,Db  
#endif `@u+u0  
#define MAX_KEY 100 EWu iaw.  
#define CTRLBIT 0x04 _0DXQS\  
#define ALTBIT 0x02 *pcbwd!/  
#define SHIFTBIT 0x01 ;55tf l  
#pragma data_seg("shareddata") sx;V,"Y  
HHOOK hHook =NULL; vWnHC  
UINT nHookCount =0; 6nY )D6$JG  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey # `N6<nb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT q5?rp|7D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey buq *abON  
static int KeyCount =0; dVj'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;JPbBwm  
#pragma data_seg() Vz7w{HY  
HINSTANCE hins; H 'WFORso[  
void VerifyWindow(); P-E'cb%ub  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h-?q6O/|  
//{{AFX_MSG_MAP(CHookApp) `&|l;zsS  
// NOTE - the ClassWizard will add and remove mapping macros here. '-nuH;r  
// DO NOT EDIT what you see in these blocks of generated code! C$AIP\j- )  
//}}AFX_MSG_MAP 3]:p!Y`$  
END_MESSAGE_MAP() )|{1&F1  
w]o:c(x@  
CHookApp::CHookApp() ^|F Vc48{  
{ j{7ilo(i  
 // TODO: add construction code here, )CwMR'LV  
 // Place all significant initialization in InitInstance M f%^\g.}  
} .(MbP  
Hg gR=>s  
CHookApp theApp; gJcXdv=]2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {E3<GeHw4  
{ PO1:9  
 BOOL bProcessed=FALSE; ={mPg+Ei'  
 if(HC_ACTION==nCode) Dho[{xJ46  
 { S2At$47v  
  if((lParam&0xc0000000)==0xc0000000){// Key up YaY;o^11/  
   switch(wParam) QigoRB!z#9  
   { Ads<-.R  
    case VK_MENU: ^;Hi/KvM\  
     MaskBits&=~ALTBIT; 3G%XG{dg  
     break; !Z+*",]_  
    case VK_CONTROL: 5ykk11!p$  
     MaskBits&=~CTRLBIT; U'h[ {ek  
     break; )L(d$N=Bd  
    case VK_SHIFT: vs'L1$L'c  
     MaskBits&=~SHIFTBIT; J1c&"Oh  
     break; {P<BJ52=  
    default: //judge the key and send message (8@h F#N1  
     break; :ET3&J L  
   } [)J49  
   for(int index=0;index<MAX_KEY;index++){ Vlp*'2VO  
    if(hCallWnd[index]==NULL) "j.oR}s9?#  
     continue; $3]E8t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "zeJ4f  
    { oQ-|\?{;A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hD6ur=G8u  
     bProcessed=TRUE; Jc"$p\ $-  
    } FB =  
   } ^qId]s  
  } `!Ge"JB6   
  else if((lParam&0xc000ffff)==1){ //Key down qy42Y/8'  
   switch(wParam) Zjp5\+hHV  
   { >QZt)<[  
    case VK_MENU: OB*Xb*HN  
     MaskBits|=ALTBIT; iRj x];:Vu  
     break; lU50.7<08  
    case VK_CONTROL: f@;>M9)<  
     MaskBits|=CTRLBIT; zZ+LisSs&  
     break; Q:fUM[  
    case VK_SHIFT: YP\4XI  
     MaskBits|=SHIFTBIT; Xb+if  
     break; \}4#**]  
    default: //judge the key and send message 2=/g~rp*  
     break; tO+%b=Z^  
   } Og;$P 'U  
   for(int index=0;index<MAX_KEY;index++) C5sN[  
   { ;qVEI/  
    if(hCallWnd[index]==NULL) >;'1k'  
     continue; ;@ll  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,QHx*~9  
    { M#lVPXS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5rHnU<H@y  
     bProcessed=TRUE; s=y9!rr  
    } Ei p~ ~2  
   } l=-d K_ I?  
  } \")YKN=W  
  if(!bProcessed){ wkZ2Y-#='  
   for(int index=0;index<MAX_KEY;index++){ v4k=NH+w  
    if(hCallWnd[index]==NULL) :DX/r  
     continue; [[66[;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) t6L^ #\'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [@. jL0>  
   } ">D(+ xr!)  
  } |Qt`p@W  
 } c;|&>Fp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pqQdr-aR=  
} <>*''^  
]-s`#  
BOOL InitHotkey() _9O }d  
{ Uwm[q+sTp  
 if(hHook!=NULL){ sm&rR=b  
  nHookCount++; h'YcNkM 2>  
  return TRUE; Aya;ycsgE  
 } A Fm*60C  
 else BE2\?q-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); LN6JH!  
  if(hHook!=NULL) 0&rH 9  
   nHookCount++; VGDEP!)-8  
  return (hHook!=NULL); z5*O@_r+.b  
} 5W]N]^v  
BOOL UnInit() f $@".  
{ rW%'M#! =  
 if(nHookCount>1){ ~tj7zI6  
  nHookCount--; P2:Q+j:PX  
  return TRUE; qf&a<[p~  
 } \q`+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?xTeio44  
 if(unhooked==TRUE){ IO&#)Ft  
  nHookCount=0; k2tX$\E  
  hHook=NULL; -WW!V(~p  
 } ]'ApOp  
 return unhooked; CD<u@l,1  
} g-V\ s&}  
rgZ rE;*;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @Kb|  
{ e/% ;  
 BOOL bAdded=FALSE; 1yRd10  
 for(int index=0;index<MAX_KEY;index++){ W4rw;(\  
  if(hCallWnd[index]==0){ cV!/  
   hCallWnd[index]=hWnd; (_n8$3T75  
   HotKey[index]=cKey; l<K.!z<-:8  
   HotKeyMask[index]=cMask; h }%M  
   bAdded=TRUE; MVL }[J  
   KeyCount++; tA u|8aL  
   break; B?YfOSF=5  
  } "vRqtEBO@  
 } gMK3o8B/  
 return bAdded; #/v_ h6$  
} Tx?@* Q  
nPIR 1Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3^-)gK  
{ /G{3p&9  
 BOOL bRemoved=FALSE; yExyx?j.  
 for(int index=0;index<MAX_KEY;index++){ oD}FJvV  
  if(hCallWnd[index]==hWnd){ =$zr t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A`/7>'k/q[  
    hCallWnd[index]=NULL; BMj&*p8R  
    HotKey[index]=0; ;WAu]C|  
    HotKeyMask[index]=0; _ktSTzH0  
    bRemoved=TRUE; ?d#(ian  
    KeyCount--; PaeafL65=  
    break; Pk]9.e1_  
   } Ay6rUN1ef  
  } ?# c@Ag %  
 } `V_/Cz_}D  
 return bRemoved; 9a Ps_|C  
} !skWe~/  
+~k,4  
void VerifyWindow() 257;@;  
{ iR5soIR  
 for(int i=0;i<MAX_KEY;i++){ E|uXi)!.x  
  if(hCallWnd!=NULL){ \*"0wR;[K  
   if(!IsWindow(hCallWnd)){ 4sE=WPKF#  
    hCallWnd=NULL; -^ ayJ73  
    HotKey=0; $I0a2Z=dP  
    HotKeyMask=0; W2(=m!:U  
    KeyCount--; xs`gN  
   } %7wzGtM]ps  
  } 2}Plr{s9  
 } AX Jj"hN  
} *ik)>c_  
W",jZ"7  
BOOL CHookApp::InitInstance() >Ez}r(QQ^  
{ daJ-H  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); so&3A&4cL  
 hins=AfxGetInstanceHandle(); (qONeLf%  
 InitHotkey(); os ud  
 return CWinApp::InitInstance(); i1&noRGl  
} e/D\7Pf  
, ZW.P`  
int CHookApp::ExitInstance() L`@&0Zk  
{ ?gP/XjToMg  
 VerifyWindow(); "MP{z~M mj  
 UnInit(); \`9|~!,Ix7  
 return CWinApp::ExitInstance(); { 3P!b|V>  
} 9JeGjkG,  
*<5lx[:4/x  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file TEyPlSGG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #{`NJ2DU]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {"(|oIo{  
#if _MSC_VER > 1000 k ZEy  
#pragma once uH h2>Px  
#endif // _MSC_VER > 1000 -xEg"dY/  
9.}3RAB(cv  
class CCaptureDlg : public CDialog <sG>[\i  
{ =n?@My?;  
 // Construction H t$%)j9  
 public: au~gJW-  
  BOOL bTray; b|'LtL$Y  
  BOOL bRegistered; jXva ?_  
  BOOL RegisterHotkey(); gz:c_HJ  
  UCHAR cKey; mM~Q!`Nf.  
  UCHAR cMask; n!orM5=:O  
  void DeleteIcon(); Y(mwJud|  
  void AddIcon(); LYKm2C*d  
  UINT nCount; t~#+--(  
  void SaveBmp(); `b$I)UUm  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -0){C|,6  
  // Dialog Data *g.,[a0  
  //{{AFX_DATA(CCaptureDlg) CA~S$H\"  
  enum { IDD = IDD_CAPTURE_DIALOG }; yE/I)GOQjs  
  CComboBox m_Key; %['F[Mo  
  BOOL m_bControl; Nq1RAM  
  BOOL m_bAlt; ~z"->.u  
  BOOL m_bShift; x6P^IkL:  
  CString m_Path; 2!`Z3>Oa  
  CString m_Number; A[Xw|9  
  //}}AFX_DATA !LESRh?  
  // ClassWizard generated virtual function overrides ~$ Yuxo  
  //{{AFX_VIRTUAL(CCaptureDlg) z`6KX93  
 public: xBd% e-r  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]sIFK  
 protected: ]z@]Fi33Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R|yTUGY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); HM x9M$  
  //}}AFX_VIRTUAL /;[')RO`  
  // Implementation !2,.C+,  
 protected: 3c"{Wu-}  
  HICON m_hIcon; v8=MO:>{R  
  // Generated message map functions 8;bOw  
  //{{AFX_MSG(CCaptureDlg) 4K,&Q/Vdd7  
  virtual BOOL OnInitDialog(); N* QI>kzU  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #`EMK   
  afx_msg void OnPaint(); <Z wEdq  
  afx_msg HCURSOR OnQueryDragIcon();  yw^, @'  
  virtual void OnCancel(); _z< q9:  
  afx_msg void OnAbout(); Cr"hu;  
  afx_msg void OnBrowse(); <]J5AdJ  
  afx_msg void OnChange(); [:Y^0[2  
 //}}AFX_MSG {rr\hl-$  
 DECLARE_MESSAGE_MAP() ?/g(Y  
}; R2gax;  
#endif m{" zFD/  
fe,CY5B{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H$HhB8z3  
#include "stdafx.h" !ym5' h  
#include "Capture.h" ng\S%nA&J  
#include "CaptureDlg.h" U$%w"k7^(  
#include <windowsx.h> B.b)YE '  
#pragma comment(lib,"hook.lib") 3x$#L!VuU  
#ifdef _DEBUG O5"80z38[  
#define new DEBUG_NEW VzNH%  
#undef THIS_FILE r,\(Y@I  
static char THIS_FILE[] = __FILE__; *+ayC{!  
#endif pwQ."2x  
#define IDM_SHELL WM_USER+1 v?t+%|dzA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0J B"@U&-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v\Gu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; QUO?q+  
class CAboutDlg : public CDialog epePx0N%x$  
{ :2+:(^l  
 public: owB)+  
  CAboutDlg(); pQ JZE7S  
  // Dialog Data W@LR!EW)  
  //{{AFX_DATA(CAboutDlg) hHQt4 r'd  
  enum { IDD = IDD_ABOUTBOX }; #=c%:{O{4R  
  //}}AFX_DATA \qPrY.-  
  // ClassWizard generated virtual function overrides \(s ";@  
  //{{AFX_VIRTUAL(CAboutDlg) 3Hr%G4  
 protected: mNzZ/*n:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e78}  
  //}}AFX_VIRTUAL 6I<`N  
  // Implementation ^  +G> N  
 protected: xae7#d0  
  //{{AFX_MSG(CAboutDlg) j@f(cRAf#  
  //}}AFX_MSG `3Y+:!q  
  DECLARE_MESSAGE_MAP() q^)(p' X  
}; Spb'jAKj'  
?M);wBe(  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -b<+Ra  
{ 1{qg@xlj  
 //{{AFX_DATA_INIT(CAboutDlg) Y2fs$emv  
 //}}AFX_DATA_INIT A}o1I1+  
} H3b`)k sFr  
"7d_$.Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) MH-,+-Eq  
{ ! `o =2b=N  
 CDialog::DoDataExchange(pDX); ] N8V?.|:  
 //{{AFX_DATA_MAP(CAboutDlg) }0o0"J-$  
 //}}AFX_DATA_MAP NoT oLt\  
} lH 8?IkK,g  
CS  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *^]ba>  
 //{{AFX_MSG_MAP(CAboutDlg) W0Vjs|/  
 // No message handlers 78kk"9h'  
 //}}AFX_MSG_MAP X|:O`b$G  
END_MESSAGE_MAP() C.|MA(7  
Zv_<*uzKZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fQ@["b   
: CDialog(CCaptureDlg::IDD, pParent) o5d)v)Rx=  
{ 9 (Z)c  
 //{{AFX_DATA_INIT(CCaptureDlg) QGa"HG5NF  
  m_bControl = FALSE; -3C~}~$>`  
  m_bAlt = FALSE; . Hw^Nx  
  m_bShift = FALSE; -Cl0!}P4I  
  m_Path = _T("c:\\"); iD9GAe}x  
  m_Number = _T("0 picture captured."); kE1u-EA  
  nCount=0; R~o?X ^^O  
  bRegistered=FALSE; qohUxtnTK>  
  bTray=FALSE; ay2.C BF  
 //}}AFX_DATA_INIT pAYuOk9n  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {chl+au*l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `%VrT`  
} #gP\q?5Ov  
Ec|#i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d+kIof,  
{ is,_r(S  
 CDialog::DoDataExchange(pDX); X#fI$9a  
 //{{AFX_DATA_MAP(CCaptureDlg) Cs<d\"+  
  DDX_Control(pDX, IDC_KEY, m_Key); $K hc?v  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5u8 YHv  
  DDX_Check(pDX, IDC_ALT, m_bAlt); hhpH)Bi=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); eG<32$I  
  DDX_Text(pDX, IDC_PATH, m_Path); i4l?q#X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6w' ^,V  
 //}}AFX_DATA_MAP D0~mu{;c$  
}  I2b[  
&WIPz\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D n^RZLRhy  
//{{AFX_MSG_MAP(CCaptureDlg) DLVf7/=3~  
 ON_WM_SYSCOMMAND() q~lmOT~E  
 ON_WM_PAINT() giv cq'L  
 ON_WM_QUERYDRAGICON() tkA '_dcIC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) crUXpD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dS-l2 $n  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2Tp.S3  
//}}AFX_MSG_MAP F"_SCA?9?  
END_MESSAGE_MAP() 9d v+u6)  
"&An9H'  
BOOL CCaptureDlg::OnInitDialog() $WDa} ~j~^  
{ (%".=x-  
 CDialog::OnInitDialog(); ?>e-6*.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lUDzf J}3  
 ASSERT(IDM_ABOUTBOX < 0xF000); 0h* AtZv_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 3K{'~?mM  
 if (pSysMenu != NULL) Bb m1&d#  
 { >n#Pq{7aF  
  CString strAboutMenu; .Sm7na K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i=Y#kL~f  
  if (!strAboutMenu.IsEmpty()) 0-7xcF@s  
  { w zF"^CJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); Nt/>RCh  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =OCHV+m  
  } '/mwXvl  
 } 'w DNP_  
 SetIcon(m_hIcon, TRUE); // Set big icon P9gIKOOx#4  
 SetIcon(m_hIcon, FALSE); // Set small icon ]R( =)  
 m_Key.SetCurSel(0); f"S^:F0  
 RegisterHotkey(); [H!V  
 CMenu* pMenu=GetSystemMenu(FALSE); M Su_*&j9T  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R{/nlS5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vU::dr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); J 5~bs*a8  
 return TRUE; // return TRUE unless you set the focus to a control 4]B(2FR[8  
} XB2[{XH,  
.(D-vkz'  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $Z #  
{ w18kTa!4@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) zbrDDkZ1  
 { >%t"VpvR  
  CAboutDlg dlgAbout; R'He(x  
  dlgAbout.DoModal(); W EZ)7H  
 } M1^pf<!s  
 else A^xD Axk  
 { +n7bbuxj(X  
  CDialog::OnSysCommand(nID, lParam); cZi/bIh  
 } qn:3s  
} @#;2P'KL  
t ?rUbN  
void CCaptureDlg::OnPaint() !gu# #MrJ9  
{ y\]:&)?&C^  
 if (IsIconic()) \G:\36l  
 { r1f##  
  CPaintDC dc(this); // device context for painting It&$R`k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mGb,oj7l  
  // Center icon in client rectangle um~U_&>  
  int cxIcon = GetSystemMetrics(SM_CXICON); T|[zk.8=E  
  int cyIcon = GetSystemMetrics(SM_CYICON); h{#Hwp  
  CRect rect; U,\3 !D0jt  
  GetClientRect(&rect); Qt` }$]  
  int x = (rect.Width() - cxIcon + 1) / 2; P`0}( '"U  
  int y = (rect.Height() - cyIcon + 1) / 2; @uXF(KDX  
  // Draw the icon ]hRCB=G  
  dc.DrawIcon(x, y, m_hIcon); jt=%oa  
 } \b6H4aQii  
 else M|xd9kA^  
 { <'f+ nC=2  
  CDialog::OnPaint(); UU~S{!*+L  
 } ^z>3+oi  
} DAa??/,x7  
JlR (U. "  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,6J]oX  
{ 2N B/&60<  
 return (HCURSOR) m_hIcon; (= #EJB1(  
} zT4SI'r?f  
ap,%)on^  
void CCaptureDlg::OnCancel() = wEU+R_#o  
{  xY v@  
 if(bTray) [M?'N w/[S  
  DeleteIcon(); :@K 1pAh4  
  CDialog::OnCancel(); zg>4/10P1q  
} O7vJ`K(!  
h'%iY6!fA  
void CCaptureDlg::OnAbout() _[M*o0[@W  
{ Qu]F<H*Y|  
 CAboutDlg dlg; ?QR13l(  
 dlg.DoModal(); oy{ {d  
} .Aj4?AXWc  
GE?M. '!{{  
void CCaptureDlg::OnBrowse() &-.NkW@  
{ bMU0h,|]  
 CString str; $1KvL8  
 BROWSEINFO bi; dK.k,7R  
 char name[MAX_PATH]; t:$^iUrx  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~&{LMf  
 bi.hwndOwner=GetSafeHwnd(); NW?.Ge.!P  
 bi.pszDisplayName=name;  a>6@1liT  
 bi.lpszTitle="Select folder"; u]`ur#_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; | 6/ # H*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ZF@T,i9  
 if(idl==NULL) MbbKo-7F$  
  return; ]&+,`1_q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hsCts@R  
 str.ReleaseBuffer(); MVDEVq0  
 m_Path=str; ?R#?=<VkG  
 if(str.GetAt(str.GetLength()-1)!='\\') m0M;f+^  
  m_Path+="\\"; 2,T^L (]  
 UpdateData(FALSE); 8r{:d i*  
} ,2>nr goM  
K."%PdC  
void CCaptureDlg::SaveBmp() D2N<a=#  
{ u*w'.5l  
 CDC dc; {>r56 \!F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Lkf}+aY  
 CBitmap bm; K3*8-Be  
 int Width=GetSystemMetrics(SM_CXSCREEN); e<Bw duy  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0D==0n  
 bm.CreateCompatibleBitmap(&dc,Width,Height); e^%>_U  
 CDC tdc; V(#z{!  
 tdc.CreateCompatibleDC(&dc); oEJYAKN  
 CBitmap*pOld=tdc.SelectObject(&bm); P&kjtl68 Y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3q}fDM(@J  
 tdc.SelectObject(pOld); +-$Hx5  
 BITMAP btm; 4).i4]%LH  
 bm.GetBitmap(&btm); 6R=dg2tKT  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .ey=gI!x0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h+d  \u  
 BITMAPINFOHEADER bih; v{2euOFE  
 bih.biBitCount=btm.bmBitsPixel; IN!,|)8s  
 bih.biClrImportant=0; $>*TO1gb+  
 bih.biClrUsed=0; t^')ST  
 bih.biCompression=0; n`TXm g  
 bih.biHeight=btm.bmHeight; <$+Cd=71\  
 bih.biPlanes=1; 7SVq fWp  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;;{!wA+"D  
 bih.biSizeImage=size; Ex`!C]sQ  
 bih.biWidth=btm.bmWidth; &i{>Li  
 bih.biXPelsPerMeter=0; tgpg  
 bih.biYPelsPerMeter=0; ~jOn)jBRZ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2leTEs5aK`  
 static int filecount=0; 0; PV gO;9  
 CString name; _X/`7!f  
 name.Format("pict%04d.bmp",filecount++); #[LnDU8>9  
 name=m_Path+name; NpLO_-  
 BITMAPFILEHEADER bfh; 8~@?cy1j!  
 bfh.bfReserved1=bfh.bfReserved2=0; ~u^MRe|`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); jwQ(E  
 bfh.bfSize=54+size; y7Sey;  
 bfh.bfOffBits=54; :d{-"RAG"  
 CFile bf; SSH 1Ge5|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xZc].l6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UZDXv=r|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XUK!1}  
  bf.WriteHuge(lpData,size); RASPOc/]   
  bf.Close(); }Kt1mmo:`  
  nCount++;  ze_q+Z  
 } q  W"  
 GlobalFreePtr(lpData); duT'$}2@>  
 if(nCount==1) tX'2 $}  
  m_Number.Format("%d picture captured.",nCount); Mv%"aFC  
 else #fQ}8UxU,  
  m_Number.Format("%d pictures captured.",nCount); Op>l~{{{  
  UpdateData(FALSE); o1^Rx5  
} /t=Fx94  
gAxf5 A_x)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |%~Zo:Q<$>  
{ +B#+'  
 if(pMsg -> message == WM_KEYDOWN) |J+oz7l?-  
 { DV5K)m&G  
  if(pMsg -> wParam == VK_ESCAPE) ^Yg}>?0  
   return TRUE; j.:I{!R#  
  if(pMsg -> wParam == VK_RETURN) !Sj0!\  
   return TRUE; s"-gnW  
 } ?j^:jV  
 return CDialog::PreTranslateMessage(pMsg); P g.j]  
} j.O+e|kxU  
hg Pzx@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QTLGM-Z  
{ q>5 K:5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "xxt_  
  SaveBmp(); zNRR('B?  
  return FALSE; ~M Mv+d88  
} 1wTPT,k  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LAjreC<W  
 CMenu pop; J)n^b  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2R=Fc@MXs  
 CMenu*pMenu=pop.GetSubMenu(0); K|V<e[X[V  
 pMenu->SetDefaultItem(ID_EXITICON); 2Sb68hJIE  
 CPoint pt; cD JeYduK  
 GetCursorPos(&pt); `c.P`@KA  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;t\oM7J|  
 if(id==ID_EXITICON) Je &O  
  DeleteIcon(); Bp9_\4  
 else if(id==ID_EXIT) %k =c9ll@:  
  OnCancel(); >HL$=J_K?  
 return FALSE; @ CNe)&U  
} 8m"(T-wb6{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {\p&?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;&OVV+y  
 AddIcon(); ttfCiP$  
 return res; U@:h';.  
} Q4e+vBECkq  
2Y1y;hCK  
void CCaptureDlg::AddIcon() \6L,jSoBl  
{ X')t6DQ(I  
 NOTIFYICONDATA data; ]9hXiY  
 data.cbSize=sizeof(NOTIFYICONDATA); GJj}|+|  
 CString tip; k\<8h%  
 tip.LoadString(IDS_ICONTIP); :/XWk %  
 data.hIcon=GetIcon(0); }O+`X) 9  
 data.hWnd=GetSafeHwnd(); oa<%R8T?@  
 strcpy(data.szTip,tip); M"!{Dx~  
 data.uCallbackMessage=IDM_SHELL; o ~`KOe  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; yBkcYHT  
 data.uID=98; d3jzGJrU}  
 Shell_NotifyIcon(NIM_ADD,&data); ?,  m_q+  
 ShowWindow(SW_HIDE); 5Ei4$T  
 bTray=TRUE; \PL0-.t,  
} 'aqlNBG*  
q#_<J1)z  
void CCaptureDlg::DeleteIcon() YMr2Dv\y  
{ _h^er+d!_  
 NOTIFYICONDATA data; ';zS0Yk  
 data.cbSize=sizeof(NOTIFYICONDATA); )uRR!<"~  
 data.hWnd=GetSafeHwnd(); f~ P~%  
 data.uID=98; 34c+70x7  
 Shell_NotifyIcon(NIM_DELETE,&data); K)N'~jCG  
 ShowWindow(SW_SHOW); S=_*<[W%4  
 SetForegroundWindow(); - jWXE  
 ShowWindow(SW_SHOWNORMAL); kHz?vVE/l  
 bTray=FALSE; BG^)?_69  
} =k\Qx),Ir  
EV[ BB;eb  
void CCaptureDlg::OnChange() %v)+]Ds{  
{ {&uN q^Ch  
 RegisterHotkey(); ap wA  
} F#KUu3;B  
WGA"e   
BOOL CCaptureDlg::RegisterHotkey() Nz;f| 2h  
{ L2> )HG  
 UpdateData(); [pX cKN  
 UCHAR mask=0; w:h([q4X  
 UCHAR key=0; ,u S)N6'b6  
 if(m_bControl) THy{r_dx  
  mask|=4; AYsiaSTRqW  
 if(m_bAlt) ,Q,3^v-  
  mask|=2; $J9/AFzO"  
 if(m_bShift) _jM+;=f  
  mask|=1; OMm'm\+/  
  key=Key_Table[m_Key.GetCurSel()]; &xE+PfX  
 if(bRegistered){ s8+{##"1 q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W(o#2;{ ln  
  bRegistered=FALSE; jZR2Nx}16  
 } v9MliD'  
 cMask=mask; XM~eocn  
 cKey=key; iLk"lcX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gQ$0 |0O  
 return bRegistered; 6QePrf  
} FV\$M6 _  
q'KXn0IY#  
  四、小结 ,% *Jm  
yC\!6pg  
  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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