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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: ER.}CM6{[  
  hM@>q&q_  
  一、实现方法 j|#Bo:2km  
=Jb>x#Y  
  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: QhJiB%M  
P+/e2Y  
#pragma data_seg("shareddata") oYH-wQj  
HHOOK hHook =NULL; //钩子句柄 z-)O9PV  
UINT nHookCount =0; //挂接的程序数目 \ }G> 8^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 20Wg=p9L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?.BC#S)q1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey xU`p|(SS-  
static int KeyCount =0; vy I!]p  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $6SW;d+>n  
#pragma data_seg() /IMFO:c  
U # qK.  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 j&qub_j"xX  
ZPYS$Ydy  
  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: II,8O  
c{w2Gt!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR NTs aW}g  
cKey,UCHAR cMask) {I't]Qj_e  
{ e+fN6v5pU  
 BOOL bAdded=FALSE; ?4T-@~~*`=  
 for(int index=0;index<MAX_KEY;index++){ "3Y0`&:D  
  if(hCallWnd[index]==0){ QoT;WM Z  
   hCallWnd[index]=hWnd; x7 ,5  
   HotKey[index]=cKey; "f OV^B  
   HotKeyMask[index]=cMask; `'7R,  
   bAdded=TRUE; eTcd"Kd/  
   KeyCount++; 9_/:[N6|c|  
   break; '!B&:X)  
  } +ami?#Sz*;  
 } U|R_OLWAg  
 return bAdded; !R`{ TbN  
} 7WzxA=*#  
//删除热键 j^RmrOg ,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dioGAai'  
{ sc#qwQ#  
 BOOL bRemoved=FALSE; 19%i mf  
 for(int index=0;index<MAX_KEY;index++){ E|shs=I  
  if(hCallWnd[index]==hWnd){ *.w 9c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U- k`s[dv  
    hCallWnd[index]=NULL; >uEzw4w  
    HotKey[index]=0; /PXzwP_(A  
    HotKeyMask[index]=0; )MT}+ai  
    bRemoved=TRUE; YKK*ER0  
    KeyCount--; Q\sK"~@3  
    break; Xne1gms  
   } BDQsP$'6QT  
  } [AJJSd/:  
 } !^G\9"4A  
 return bRemoved; QIFgQ0{  
} w7&A0M  
+R75v)  
J C}D` h  
  DLL中的钩子函数如下: {R{=+2K!|k  
_ jlRlt  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9H1rO8k  
{ gbD KE{  
 BOOL bProcessed=FALSE; H3oFORh  
 if(HC_ACTION==nCode) gI|~|-'  
 { %E;'ln4h&,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 MomwX  
   switch(wParam) Q22 GIr  
   {  K wVbbC3  
    case VK_MENU: P[fq8lDA  
     MaskBits&=~ALTBIT; wVtwx0|1  
     break; lH~[f  
    case VK_CONTROL: WUTowr  
     MaskBits&=~CTRLBIT; I)HPO,7  
     break; ;722\y(Y  
    case VK_SHIFT: |;{6& S  
     MaskBits&=~SHIFTBIT; o^wqFX(Y  
     break; 3o/[t  
    default: //judge the key and send message .x&%HA  
     break; L-&\\{ X  
   } llDkJ)\  
   for(int index=0;index<MAX_KEY;index++){ 9;If&uM  
    if(hCallWnd[index]==NULL) *qpSXmOz  
     continue; M D#jj3y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2st3  
    { /BL4<T f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )QJUUn#  
     bProcessed=TRUE; HjwE+:w  
    } K:WDl;8 (d  
   } MnHNjsO#  
  } DVeE1Q  
  else if((lParam&0xc000ffff)==1){ //有键按下 o5)<$P43  
   switch(wParam) f%8C!W]Dm  
   { \ B%+fw  
    case VK_MENU: HK% 7g  
     MaskBits|=ALTBIT; 1xx}~|F?|  
     break; l}P=/#</T  
    case VK_CONTROL: ?&uu[y  
     MaskBits|=CTRLBIT; o#N+Y?O  
     break; wdoR%b{M  
    case VK_SHIFT: bhs _9ivw  
     MaskBits|=SHIFTBIT; c[s4EUG  
     break; GKeU%x  
    default: //judge the key and send message A?0Nm{O;3v  
     break; '0,^6'VWOV  
   } 0IWf!Sk ]  
   for(int index=0;index<MAX_KEY;index++){ 23jwAsSo  
    if(hCallWnd[index]==NULL) $Z>'Jp  
     continue; MfkN]\Jyw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fd9k?,zM  
    { bs1Rvx1:J%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :MDKC /mC  
     bProcessed=TRUE; ]JR +ayk7  
    } *n"{J(Jt`  
   } /wlEe>i  
  } .o}v#W+st  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]{>,rK[So  
   for(int index=0;index<MAX_KEY;index++){ 9Gz=lc[!7  
    if(hCallWnd[index]==NULL) R/a*LSe@&  
     continue; %N_%JK\{@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9MqGIOQ${j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BD7N i^qI$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,"0 :3+(8;  
   } N4HqLh23H  
  } |vzl. ^"-  
 } M"To&?OI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); QSf|nNT  
} rQ snhv  
f|oh.z_R  
  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: '/%H3A#L  
/2VJX@h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M rb)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); caX< n>  
7Fsay+a  
  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: is@?VklnB  
|(^PS8wG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }W,[/)MO  
{ oe~b}:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Wh{tZ~c  
 { 8*a&Jl  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 iDrZc  
  SaveBmp(); Ny)X+2Ae  
  return FALSE; lqpp)Cq  
 } seeB S/%  
 …… //其它处理及默认处理 jmW7)jT8:  
} lU8Hd|@-  
,5<Cd,`*  
iO; 7t@]-  
  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。 8DaL,bi*.  
\Y}8S/]  
  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。 SMK_6?MZ  
^pk7"l4Xm  
  二、编程步骤 U~7c+}:c  
0_t!T'jr7  
  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"; L_iFt!  
@U}1EC{A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; FzC'G57Kl  
7Hu3>4<  
  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; 8}| (0mC  
jrh43 \$*  
  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; Thit  
VyGJ=[ ]  
  5、 添加代码,编译运行程序。 }RqK84K  
65^9  
三、程序代码 < c/5b]No  
!%0 * z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL IPo?:1x]s  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) W5MTD]J   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ pz>>)c`  
#if _MSC_VER > 1000 ]z9=}=If  
#pragma once czd~8WgOa  
#endif // _MSC_VER > 1000 3m)y|$R  
#ifndef __AFXWIN_H__ !C: $?oU  
#error include 'stdafx.h' before including this file for PCH '!$Rw"K.  
#endif TRq6NB  
#include "resource.h" // main symbols XpJ7o=?W3  
class CHookApp : public CWinApp IO-Ow!  
{ 6NHX2Ja  
 public: wAW5 Z0D  
  CHookApp(); =C.$ UX  
  // Overrides <UQbt N-B\  
  // ClassWizard generated virtual function overrides N ?"]  
  //{{AFX_VIRTUAL(CHookApp) n6a`;0f[R  
 public: /I0%Z+`=  
  virtual BOOL InitInstance(); Y0 -n\|  
  virtual int ExitInstance(); X}\:_/  
  //}}AFX_VIRTUAL ~R92cH>L  
  //{{AFX_MSG(CHookApp) mL: sJf  
  // NOTE - the ClassWizard will add and remove member functions here. "LTad`]<Ro  
  // DO NOT EDIT what you see in these blocks of generated code ! 0KOgw*>_  
  //}}AFX_MSG `+Q%oj#FF  
  DECLARE_MESSAGE_MAP() WI-1)1t  
}; *bA.zmzM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); SI-Ops~e  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gSQJJxZ{?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9mTJ|sN:e  
BOOL InitHotkey(); Y`S vMkP)+  
BOOL UnInit(); :G%61x&=Zc  
#endif SNI)9k(T{  
q5)O%l!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. | h#u^v3  
#include "stdafx.h" kL"2=7m;  
#include "hook.h" @t_=Yl2;  
#include <windowsx.h> j+  0I-p  
#ifdef _DEBUG v #j$;  
#define new DEBUG_NEW ?2Py_gkf  
#undef THIS_FILE Dwfu.ZJa  
static char THIS_FILE[] = __FILE__; XuM'_FN`A<  
#endif J{fH ['tzO  
#define MAX_KEY 100 6G""I]uT  
#define CTRLBIT 0x04 4u})+2W  
#define ALTBIT 0x02 _^%,x  
#define SHIFTBIT 0x01 q9r[$%G  
#pragma data_seg("shareddata") x-&@wMqkc  
HHOOK hHook =NULL; CdjI`  
UINT nHookCount =0; .jjG(L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^yN&ZI3P&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT x)O!["'"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey mb^~qeRQ  
static int KeyCount =0; N~zdWnSZ@G  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift UJ')I`zuI  
#pragma data_seg() @O^6&\s>  
HINSTANCE hins; >V8-i`  
void VerifyWindow(); a'yK~;+_9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |[ai JR[Q  
//{{AFX_MSG_MAP(CHookApp) 3K0A)W/YEs  
// NOTE - the ClassWizard will add and remove mapping macros here. CU2*z(]&  
// DO NOT EDIT what you see in these blocks of generated code! Gm^U;u}=f  
//}}AFX_MSG_MAP '$]97b7G  
END_MESSAGE_MAP() O`t&ldU  
V#gK$uv  
CHookApp::CHookApp() HJ[cM6$2  
{ [MM~H0=s  
 // TODO: add construction code here, ~ =2PU$u  
 // Place all significant initialization in InitInstance O ^duZ*b  
} w;:*P  
B7E:{9l~s{  
CHookApp theApp; j@3Q;F0ba  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ShP^A"Do  
{ ag;pN*z  
 BOOL bProcessed=FALSE; kxIF#/8  
 if(HC_ACTION==nCode) 1FL~ndJs  
 { u(F_oZ~  
  if((lParam&0xc0000000)==0xc0000000){// Key up h_3E)jc  
   switch(wParam) ]dmrkZz:  
   { :zke %Yx  
    case VK_MENU: sfugY (m  
     MaskBits&=~ALTBIT; RmeD$>7  
     break; Ed df2;-.  
    case VK_CONTROL: 6@F9G 4<Z  
     MaskBits&=~CTRLBIT; t: ;Pj9  
     break; u5b|#&-mX  
    case VK_SHIFT: |tMWCA  
     MaskBits&=~SHIFTBIT; g63(E,;;J  
     break; vm7z,FfN  
    default: //judge the key and send message rCbDu&k]  
     break; }t=!(GOb}  
   } m{cGK`/\  
   for(int index=0;index<MAX_KEY;index++){ Ru!iR#s)!  
    if(hCallWnd[index]==NULL) g-</ua(j  
     continue; 5o'FS{6U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) */^q{PsN  
    { 6"5A%{ J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); { VfXsI  
     bProcessed=TRUE; Zd}9O jz5  
    } }1c|gQ  
   } /h H  
  } I7vz+>Jr  
  else if((lParam&0xc000ffff)==1){ //Key down t?-n*9,#S  
   switch(wParam) =9boya,>  
   { 0$)>D==  
    case VK_MENU: (ybI\UI  
     MaskBits|=ALTBIT; ~Z?TFg  
     break; t~EPn.  
    case VK_CONTROL: L~rBAIdD  
     MaskBits|=CTRLBIT; Is)u }  
     break; k"T}2 7  
    case VK_SHIFT: k}kQI~S9  
     MaskBits|=SHIFTBIT; ;4^Rx  
     break; Yz/md1T$  
    default: //judge the key and send message 7Oa#c<2]  
     break; g1/[eoZzk  
   } n.`($yR_  
   for(int index=0;index<MAX_KEY;index++) J6s`'gFns  
   { QT< }] 0  
    if(hCallWnd[index]==NULL) EyD=q! ZVZ  
     continue; X<`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hl7bzKO*w  
    { i&Tbz!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b8`)y<7  
     bProcessed=TRUE; 'RQ+g}|Ba!  
    } j^j1  
   } /og=IF2:  
  } < Mn ;  
  if(!bProcessed){ /yDz/>ID\  
   for(int index=0;index<MAX_KEY;index++){ @Q ]=\N:  
    if(hCallWnd[index]==NULL) (lBCO?`fx  
     continue; ^pAAzr"hv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KQaxvU)L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |"X*@s\'  
   } c?f4Q,%|  
  } Fh?gNSWq6  
 } 25nt14Y 0u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jiV<+T?  
} _wbF>z  
VuhGx:Xl  
BOOL InitHotkey() =\&;Fi]  
{ NR 5gj-B[  
 if(hHook!=NULL){ 'NXN& {  
  nHookCount++; }W C[$Y_@  
  return TRUE; b$d;Qx  
 } 7{e  4c  
 else Ex Y]Sdx  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); zsEc(  
  if(hHook!=NULL) :KSV4>X[%a  
   nHookCount++; CTB~Yj@d+  
  return (hHook!=NULL); u:6Ic)7'  
} e8>})  
BOOL UnInit() y2Q&s 9$Do  
{ .KB^3pOpx  
 if(nHookCount>1){ GvtG(u~  
  nHookCount--; 1![!+X:w  
  return TRUE; 4M=]wR;  
 } \#2Z)Kz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c?(4t67|  
 if(unhooked==TRUE){ YquI$PV _  
  nHookCount=0; *<$*"p  
  hHook=NULL; (+w*[qHe  
 } bQzZy5,  
 return unhooked; 2prU  
} A9KET$i@v  
DzAg"6=CS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?(@ 7r_j  
{ JinUV6cr  
 BOOL bAdded=FALSE; e[{0)y>=  
 for(int index=0;index<MAX_KEY;index++){ N~nziY*C,*  
  if(hCallWnd[index]==0){ !4ocZmj\  
   hCallWnd[index]=hWnd; 6iry6wcHm  
   HotKey[index]=cKey; z 4e7PW|  
   HotKeyMask[index]=cMask; u4*BX&  
   bAdded=TRUE; Fx]WCQo  
   KeyCount++; lne|5{h  
   break; vO H4#  
  } SJlr53  
 } Oz75V|D  
 return bAdded; %HhBt5w  
} ^Y?k0z  
/m!BY}4W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^L,K& Jd  
{ +i6GHBn~J  
 BOOL bRemoved=FALSE; v1#otrf  
 for(int index=0;index<MAX_KEY;index++){ vJLK,[  
  if(hCallWnd[index]==hWnd){ 3 #n_?-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q8$}@iA[  
    hCallWnd[index]=NULL; W Tcw4  
    HotKey[index]=0; w$>u b@=  
    HotKeyMask[index]=0; 4XL^D~V  
    bRemoved=TRUE; av(6wht8  
    KeyCount--; lPe&h]@ >  
    break; Yz9owe8}[  
   } Hkg2P ,2  
  } *j|~$e}C  
 } ~kV/!=  
 return bRemoved; :S]\0;8]  
} a6 ekG YW  
JT~4mT  
void VerifyWindow() HGl|-nW>  
{ &L3M]  
 for(int i=0;i<MAX_KEY;i++){ s$IDLs,WM  
  if(hCallWnd!=NULL){ xKbXt;l2  
   if(!IsWindow(hCallWnd)){ g/4[N{Xf  
    hCallWnd=NULL; y-Fo=y  
    HotKey=0; >:SHV W  
    HotKeyMask=0; k``_EiV4t  
    KeyCount--; aI'&O^w+  
   } )',R[|<  
  } ip\sXVR  
 } 7K12 G!)  
} JhYe6y[q  
@b\$yB@z  
BOOL CHookApp::InitInstance() 7lTC{7C57  
{ xl{=Y< ;  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); , };& tR  
 hins=AfxGetInstanceHandle(); G+9,,`2  
 InitHotkey(); 39c2pV[  
 return CWinApp::InitInstance(); 'JtBZFq  
} "37lx;CH  
oE @a'*.\  
int CHookApp::ExitInstance() +SzU  
{ SZ7:u895E  
 VerifyWindow(); BX/8O<s0  
 UnInit(); #&+{mCjs  
 return CWinApp::ExitInstance(); wKh4|Ka  
} PxX 4[ P  
 y`iBFC;_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file _ >?\DgjH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) fy1|$d{'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E*& vy  
#if _MSC_VER > 1000 810|Tj*U%  
#pragma once - nm"of\o  
#endif // _MSC_VER > 1000 TvoyZW\?w  
3ZuZ/=  
class CCaptureDlg : public CDialog >dXGee>'M  
{ :9afg  
 // Construction te`$%NRl  
 public: b#c:u2  
  BOOL bTray; HdI8f!X'TG  
  BOOL bRegistered; [|wZ77\  
  BOOL RegisterHotkey(); p>,|50|  
  UCHAR cKey; n6=By|jRh  
  UCHAR cMask; &<g|gsG`  
  void DeleteIcon(); 8LJ8 }%*  
  void AddIcon(); O^PKn_OJ  
  UINT nCount; a~`eQ_N D  
  void SaveBmp(); ;<Sd~M4f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2>9C-VL2  
  // Dialog Data .~db4d]  
  //{{AFX_DATA(CCaptureDlg) <V'@ks%  
  enum { IDD = IDD_CAPTURE_DIALOG }; \&:nFb%=  
  CComboBox m_Key; ~G p [_ %K  
  BOOL m_bControl; mM~qBrwL  
  BOOL m_bAlt; 0 JS?;fk  
  BOOL m_bShift; P{`C^W$J^  
  CString m_Path; v~+(GqR=+  
  CString m_Number; LrfVh-}|:Y  
  //}}AFX_DATA FZ QP%]FX  
  // ClassWizard generated virtual function overrides 68|E9^`l  
  //{{AFX_VIRTUAL(CCaptureDlg) urc| D0n  
 public:  7Die FZ?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )}R0Y=e  
 protected: o|^3J{3G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B IEO,W|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pad*oPH,  
  //}}AFX_VIRTUAL P8 c`fbkX2  
  // Implementation pX<`+t[  
 protected: g/_5unI}u  
  HICON m_hIcon; ^e5=hH-%  
  // Generated message map functions _ye |Y  
  //{{AFX_MSG(CCaptureDlg) :G=fl)!fE  
  virtual BOOL OnInitDialog(); o[4}h:> dq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UgRiIQMq.  
  afx_msg void OnPaint(); g =hg%gRy"  
  afx_msg HCURSOR OnQueryDragIcon(); m~ABC#,2  
  virtual void OnCancel(); (x|T+c"bAX  
  afx_msg void OnAbout(); +E+p"7  
  afx_msg void OnBrowse();  dFc':|  
  afx_msg void OnChange(); Wi<m{.%\E  
 //}}AFX_MSG 0auYG><=  
 DECLARE_MESSAGE_MAP() By,eETU]  
}; (m}'4et~L  
#endif 1~FOgk1;  
I{&[[7H  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]0OR_'?,  
#include "stdafx.h" c#]4awHU  
#include "Capture.h" @4C% +-  
#include "CaptureDlg.h" M0"_^?  
#include <windowsx.h> B mb0cF Q  
#pragma comment(lib,"hook.lib") =I5>$}q_&,  
#ifdef _DEBUG 8W7J3{d  
#define new DEBUG_NEW VGN5<?PrN  
#undef THIS_FILE  > |=ts  
static char THIS_FILE[] = __FILE__;  }v{LRRi  
#endif 4"ZP 'I;  
#define IDM_SHELL WM_USER+1 `(;m?<%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6|=f$a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E]d. z6k  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W@IQ^ }E  
class CAboutDlg : public CDialog DCa^ u'f  
{ Nx;~@  
 public: j;r-NCBnz  
  CAboutDlg(); !BF; >f`  
  // Dialog Data wHLLu~m\  
  //{{AFX_DATA(CAboutDlg) N~gzDQ3  
  enum { IDD = IDD_ABOUTBOX }; Tidn-2L73O  
  //}}AFX_DATA djZqc5t  
  // ClassWizard generated virtual function overrides o-HT1Hc!  
  //{{AFX_VIRTUAL(CAboutDlg) re<{ >  
 protected: hfTY.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ax@$+/Z!  
  //}}AFX_VIRTUAL 3?yg\  
  // Implementation }8z?t:|S  
 protected: gD?l-RT>  
  //{{AFX_MSG(CAboutDlg) vr l-$ii  
  //}}AFX_MSG & .j&0WE  
  DECLARE_MESSAGE_MAP() 00y!K m_D  
}; $%Kf q[Q  
eByz-,{P  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) BxmWIItz  
{ A)!*]o>U  
 //{{AFX_DATA_INIT(CAboutDlg) 0d&6lqTo  
 //}}AFX_DATA_INIT ITBE|b  
} G` A4|+W"  
RqrdAkg  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) T^KKy0ZGM  
{  8nJpp  
 CDialog::DoDataExchange(pDX); t:Q*gW Rh  
 //{{AFX_DATA_MAP(CAboutDlg) j^JPZ{ej ?  
 //}}AFX_DATA_MAP ~ 7s!VR  
} n\53wh@+  
Gd=RyoJl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2ilQXy  
 //{{AFX_MSG_MAP(CAboutDlg) u#.2w)!D  
 // No message handlers GVn!O1jio  
 //}}AFX_MSG_MAP 3 0H?KAV  
END_MESSAGE_MAP() VONDc1%ga  
##*3bDf$-5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zF<R'XP  
: CDialog(CCaptureDlg::IDD, pParent) =H8;iS2R  
{ ,qxu|9L  
 //{{AFX_DATA_INIT(CCaptureDlg) *] X'( /b_  
  m_bControl = FALSE; &QgR*,5eo  
  m_bAlt = FALSE; iBa A9  
  m_bShift = FALSE; ga+dt  
  m_Path = _T("c:\\"); |{ip T SH  
  m_Number = _T("0 picture captured."); #6=  
  nCount=0; bH~dJFj/  
  bRegistered=FALSE; K"MX!  
  bTray=FALSE; S9.o/mr  
 //}}AFX_DATA_INIT KWHY4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 g 7H(PF?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hVY$;s  
} !Uo4,g6r+  
h_'*XWd@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yWSGi#)1  
{ z{QqY.Gu{G  
 CDialog::DoDataExchange(pDX); =s6 opL)  
 //{{AFX_DATA_MAP(CCaptureDlg) Bzf^ivT3L  
  DDX_Control(pDX, IDC_KEY, m_Key); 6gDN`e,@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _[BP 0\dPW  
  DDX_Check(pDX, IDC_ALT, m_bAlt); tw@X> G1z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9(Xn>G'iT  
  DDX_Text(pDX, IDC_PATH, m_Path); 8s@3hXD&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); |G<|F`Cj  
 //}}AFX_DATA_MAP m&3xJuKih  
} :3 mh@[V  
a<e[e>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) tH4B:Bgj!  
//{{AFX_MSG_MAP(CCaptureDlg) Ewz!O`  
 ON_WM_SYSCOMMAND() 6u6x  
 ON_WM_PAINT() [-w%/D%@  
 ON_WM_QUERYDRAGICON() o8MZiU1Xf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %BODkc Zh  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dE3) | %  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Id9TG/H7  
//}}AFX_MSG_MAP MdF2Gk-9  
END_MESSAGE_MAP() Fr-SvsNFB  
7yQ4*UB  
BOOL CCaptureDlg::OnInitDialog() l]SX@zTb  
{ z$sGv19pB  
 CDialog::OnInitDialog(); LzL So"n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =_^X3z0  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5)40/cBe  
 CMenu* pSysMenu = GetSystemMenu(FALSE); k5)om;.w  
 if (pSysMenu != NULL) n6 v6K1  
 { %TqC/c  
  CString strAboutMenu; &^nGtW%a 9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); U0+-W07>  
  if (!strAboutMenu.IsEmpty()) O6Y0XL  
  { O/LXdz0B  
   pSysMenu->AppendMenu(MF_SEPARATOR); HaYo!.(Fv  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >Q*Wi  
  } rN>R|].  
 } wIgS3K  
 SetIcon(m_hIcon, TRUE); // Set big icon mkpMfPt  
 SetIcon(m_hIcon, FALSE); // Set small icon y{Q {'De  
 m_Key.SetCurSel(0); d(K +);!  
 RegisterHotkey(); =~gvZV-<  
 CMenu* pMenu=GetSystemMenu(FALSE); i30!}}N8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7p[n  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <3 uNl  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m {}Lm)M  
 return TRUE; // return TRUE unless you set the focus to a control  !@sUj  
} gM]:Ma  
A@'OJRc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (k P9hcV  
{ Ort(AfW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) OrW  
 { JGZBL{8  
  CAboutDlg dlgAbout; V[V[~;Py  
  dlgAbout.DoModal(); ^rz_f{c]-  
 } [>9is=>o.  
 else IGgL7^MF  
 { s#MPX3itK  
  CDialog::OnSysCommand(nID, lParam); kGJC\{N5N  
 } fV~~J2IK  
} ykJ>*z  
O&&~NXI\  
void CCaptureDlg::OnPaint() L50n8s  
{ +ai< q>+  
 if (IsIconic()) fsXy"#mOkD  
 { 9JwPSAo;  
  CPaintDC dc(this); // device context for painting 1H9!5=Ff  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j1Ezf=N6`  
  // Center icon in client rectangle #z42C?V  
  int cxIcon = GetSystemMetrics(SM_CXICON); sRfcF`7  
  int cyIcon = GetSystemMetrics(SM_CYICON); WzWX E(  
  CRect rect; X{VOAcugr  
  GetClientRect(&rect); 0{mex4  
  int x = (rect.Width() - cxIcon + 1) / 2; Ca-j?bb!  
  int y = (rect.Height() - cyIcon + 1) / 2; !m$jk2<  
  // Draw the icon #E]59_  
  dc.DrawIcon(x, y, m_hIcon); Va8&Z  
 } Kpp_|2|@<  
 else ?ubro0F:  
 { 8Y?;x}  
  CDialog::OnPaint(); s^SJY{  
 } \NC3'G:Ii  
} 7z-[f'EIUI  
V.Mry`9-  
HCURSOR CCaptureDlg::OnQueryDragIcon() GthYzd:'hJ  
{ Pz^544\~ou  
 return (HCURSOR) m_hIcon; .V*^|UXbHi  
} Dh*n!7lD`  
W!<U85-#S  
void CCaptureDlg::OnCancel() /tLVX} &  
{ |hQ;l|SWg  
 if(bTray) =">NQ)98u  
  DeleteIcon(); I_BJH'!t  
  CDialog::OnCancel(); Debv4Gr;^  
} .^g p?  
KmF]\:sMD  
void CCaptureDlg::OnAbout() uq{ beC  
{ W8<%[-r  
 CAboutDlg dlg; ElXFeJ%[G  
 dlg.DoModal(); `x|?&Ytmf9  
} P*o9a  
3sk9`=[{$  
void CCaptureDlg::OnBrowse() #1[u (<AS  
{ 2?x4vI np;  
 CString str; ME dWLFf  
 BROWSEINFO bi; [gB+C84%%  
 char name[MAX_PATH]; 6nQq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Q20 %"&Xp]  
 bi.hwndOwner=GetSafeHwnd(); M?qy(zb  
 bi.pszDisplayName=name; Z}QB.$&  
 bi.lpszTitle="Select folder"; >V~E]P%@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; AR=]=8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); f<H2-(m  
 if(idl==NULL) #`IN`m|  
  return; =Uh$&m  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A's{j7  
 str.ReleaseBuffer(); PM+[,H  
 m_Path=str; ys~x $  
 if(str.GetAt(str.GetLength()-1)!='\\') wbHb;]  
  m_Path+="\\"; "fI6Cpc  
 UpdateData(FALSE); HhpDR  
} PdCEUh\>y  
(?c-iKGc  
void CCaptureDlg::SaveBmp() 2?5>o!C  
{ 99S ^f:t  
 CDC dc; ,'+kBZOv  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); : 'c&,oLY  
 CBitmap bm; G#CXs:1pd+  
 int Width=GetSystemMetrics(SM_CXSCREEN); N$DkX)Z  
 int Height=GetSystemMetrics(SM_CYSCREEN); xmX 4qtAL  
 bm.CreateCompatibleBitmap(&dc,Width,Height); G"6 !{4g  
 CDC tdc; B6"0OIDY"  
 tdc.CreateCompatibleDC(&dc); n ;Ei\\p!  
 CBitmap*pOld=tdc.SelectObject(&bm); ;,TFr}p`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Si7*& dw=  
 tdc.SelectObject(pOld); %;/P&d/  
 BITMAP btm; AdmC&!nH  
 bm.GetBitmap(&btm); JVJMgim)0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; d1*<Ll9K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I*&8^ r:A  
 BITMAPINFOHEADER bih; .N3mb6#[R  
 bih.biBitCount=btm.bmBitsPixel; DqPw#<"H  
 bih.biClrImportant=0; ~dSr5LUD  
 bih.biClrUsed=0; =-T]3!   
 bih.biCompression=0; Fs{*XKv&lH  
 bih.biHeight=btm.bmHeight; B[}6-2<>?C  
 bih.biPlanes=1; 7P T{lT  
 bih.biSize=sizeof(BITMAPINFOHEADER); LscGTs,  
 bih.biSizeImage=size; 5tnlrqC  
 bih.biWidth=btm.bmWidth; so; ]&  
 bih.biXPelsPerMeter=0; jylD6IT  
 bih.biYPelsPerMeter=0; KXrjqqXs  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u ?"Vm  
 static int filecount=0; =%7-ZH9  
 CString name; .X&9Q9T=#  
 name.Format("pict%04d.bmp",filecount++); Kq!3wb;  
 name=m_Path+name; 0"R|..l/  
 BITMAPFILEHEADER bfh; z{543~Og59  
 bfh.bfReserved1=bfh.bfReserved2=0;  k'YTpO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); FwK] $4*  
 bfh.bfSize=54+size; vI?, 47Hj+  
 bfh.bfOffBits=54; h;Qk @F  
 CFile bf; d5b%  W3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "tZe>>I  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); k+ /6$pI  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); MA\V[32H  
  bf.WriteHuge(lpData,size); ]|@^1we  
  bf.Close(); /1 dT+>  
  nCount++; ~Ei<Z`3}7"  
 } wL1MENzp*z  
 GlobalFreePtr(lpData); K"6vXv4QO  
 if(nCount==1) !Cs_F&l"j  
  m_Number.Format("%d picture captured.",nCount); s.rm7r@ #  
 else Ef\ -VKh  
  m_Number.Format("%d pictures captured.",nCount); LeQjvW9y  
  UpdateData(FALSE); / FII07V  
} n<,BmVQ  
~o(   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1 zZlC#V  
{ e.>P8C<&  
 if(pMsg -> message == WM_KEYDOWN) e.C)jv6qr  
 { ~[ jQ!tz  
  if(pMsg -> wParam == VK_ESCAPE) J,hCvm  
   return TRUE; #WuBL_nZ~  
  if(pMsg -> wParam == VK_RETURN) 1\Xw3prH  
   return TRUE; /z!%d%"  
 } ]]mJ']l  
 return CDialog::PreTranslateMessage(pMsg); w xH7?tsf  
} 7_L;E~\  
XSDpRo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y*^[P,+J*}  
{ a[C@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ok[i<zl; '  
  SaveBmp(); vd ZW%-A&\  
  return FALSE; D- c4EV  
} i. "v4D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ . vV|hSc  
 CMenu pop; 3mgD(,(^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P?\6@_ Z  
 CMenu*pMenu=pop.GetSubMenu(0); Wri<h:1  
 pMenu->SetDefaultItem(ID_EXITICON);  Sf'CN8  
 CPoint pt; x4 yR8n(  
 GetCursorPos(&pt); 8r{.jFGv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ie_wHcM<  
 if(id==ID_EXITICON) uYN`:b8  
  DeleteIcon(); n[z+<VGwC  
 else if(id==ID_EXIT) X, n:,'  
  OnCancel(); Oz95  
 return FALSE; u[YGm:}  
} gJXaPJA{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); WE?5ehEme  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yAt ^;  
 AddIcon(); YWLj?+  
 return res; <YY14p  
} Ytkv!]"  
QV!up^Zso  
void CCaptureDlg::AddIcon() CrLrw T  
{ vzM ^$V  
 NOTIFYICONDATA data; aOp\91  
 data.cbSize=sizeof(NOTIFYICONDATA); r&CiSMS*  
 CString tip; b=vkiO`2  
 tip.LoadString(IDS_ICONTIP); n S=W1zf  
 data.hIcon=GetIcon(0); w{KavU5W  
 data.hWnd=GetSafeHwnd(); ]G\}k  
 strcpy(data.szTip,tip); q m}@!z^  
 data.uCallbackMessage=IDM_SHELL; { FkF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /wp6KXm  
 data.uID=98; >7|VR:U?B  
 Shell_NotifyIcon(NIM_ADD,&data); LoV<:|GTI  
 ShowWindow(SW_HIDE); ,bi^P>X  
 bTray=TRUE; Hs8>anVo[  
} A^g(k5M*  
TOt dUO  
void CCaptureDlg::DeleteIcon() N7"W{"3D  
{ }#fbbtd  
 NOTIFYICONDATA data; COlqcq'qAu  
 data.cbSize=sizeof(NOTIFYICONDATA); 'L'R9&o<X  
 data.hWnd=GetSafeHwnd(); 0kh6@y3  
 data.uID=98; ]^E?;1$f?  
 Shell_NotifyIcon(NIM_DELETE,&data); **%37  
 ShowWindow(SW_SHOW); P pb\6|*  
 SetForegroundWindow(); P:c w|Q  
 ShowWindow(SW_SHOWNORMAL); @"A4$`Xi3  
 bTray=FALSE; N8jIMb'<  
} ,+k\p5P  
)9g2D`a4  
void CCaptureDlg::OnChange() 9[4xFE?|  
{ e'~3oqSvR  
 RegisterHotkey(); A.SvA Yn  
} j2k"cmsKh  
{ 6il`>=C  
BOOL CCaptureDlg::RegisterHotkey() e~OpofJNb  
{ x2xRBkRg=  
 UpdateData(); rI\FI0zIp_  
 UCHAR mask=0; itz,m r P  
 UCHAR key=0; sHj/;  
 if(m_bControl) x}4q {P5$  
  mask|=4; '1[Ft03  
 if(m_bAlt) \fOEqe*5SM  
  mask|=2; :OT&  
 if(m_bShift) ]Wup/o  
  mask|=1; z{q`GwW  
  key=Key_Table[m_Key.GetCurSel()]; W9&=xs6  
 if(bRegistered){ w0. u\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g)-te+?6  
  bRegistered=FALSE; >P(.:_ ^p  
 } K/$KI7 P  
 cMask=mask; F|8 &  
 cKey=key; %#+Hl0,Tt  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `[A];]  
 return bRegistered; +@UV?"d  
} (FV >m  
%b0*H_ok7  
  四、小结 ZSw.U:ep$s  
Om&Dw |xG8  
  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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