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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: nYY U  
  tp"\  
  一、实现方法 "$_ypgRrSR  
1mqFnVkf&+  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: b,wO^07-3^  
[B Al  
#pragma data_seg("shareddata") u CXd% CzE  
HHOOK hHook =NULL; //钩子句柄 `XQ5>c  
UINT nHookCount =0; //挂接的程序数目 ?zEgN!\R)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 =0S7tNut  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \c)XN<HH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  `S|gfJ  
static int KeyCount =0; k95vgn%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &IPT$=u  
#pragma data_seg() hwJ.M4  
)%6v~,'3Y  
  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;`;"+B  
6tM{cK%v1  
  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: -kO=pYP*O  
%o-*~GQ@B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 8eNGPuoL)  
cKey,UCHAR cMask) eF9LZ"-s  
{ O`eNuQSv  
 BOOL bAdded=FALSE; v-o/zud]]  
 for(int index=0;index<MAX_KEY;index++){ B(~D*H2T[  
  if(hCallWnd[index]==0){ 9I9)5`d|Jn  
   hCallWnd[index]=hWnd; .|K5b]na  
   HotKey[index]=cKey; \hz)oC   
   HotKeyMask[index]=cMask; U1Oq"Ij~  
   bAdded=TRUE; |kn}iA@72p  
   KeyCount++; @0G} Q  
   break; O3Uu{'=0  
  } 8^T' a^Wt  
 } _Uq'eZol  
 return bAdded; R9HRbVBJf  
} "3K0 wR5  
//删除热键 <"-sN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |67UN U  
{ U[ed#9l>  
 BOOL bRemoved=FALSE; qQb8K+t  
 for(int index=0;index<MAX_KEY;index++){ ,F1$Of/'@\  
  if(hCallWnd[index]==hWnd){ "H({kmR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x-"7{@lz  
    hCallWnd[index]=NULL; N4Ym[l  
    HotKey[index]=0; ,i}"e(f  
    HotKeyMask[index]=0; Y9Pb  
    bRemoved=TRUE; !vU[V,~  
    KeyCount--; =LC5o2bLy  
    break; ,?}TSJKC  
   } :c\NBKHv*  
  } ',.Xn`c  
 } ."2V:;;  
 return bRemoved; .]" o-(gB  
} )}EwEM  
`hbM 2cM  
N7[~Y2i  
  DLL中的钩子函数如下: &CS=*)>$  
\"Np'$4eu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *Hs5MXNu  
{ Lczcz"t  
 BOOL bProcessed=FALSE; :r\<DVj  
 if(HC_ACTION==nCode) SXhJz=h  
 { (Fu9lW}n  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |i|O9^*%  
   switch(wParam) $wBUu   
   {  ;gF"o5/Q  
    case VK_MENU: ?HW*qD#k  
     MaskBits&=~ALTBIT; @+xQj.jNC  
     break; H;v*/~zl  
    case VK_CONTROL: {5,CW  
     MaskBits&=~CTRLBIT; 5EU3BVu&u  
     break; B%,0zb+-L  
    case VK_SHIFT: Aoj X)_"z  
     MaskBits&=~SHIFTBIT; 4|~o<t8  
     break; R_-.:n%.z  
    default: //judge the key and send message %rf<YZ.\  
     break; C 9DRVkjj  
   } CkOd>Kn  
   for(int index=0;index<MAX_KEY;index++){ f#!Ljjf$;  
    if(hCallWnd[index]==NULL) RW3&]l=  
     continue; s}5;)>3~@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B${Q Y)t  
    { RSp=If+4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M;V2O;  
     bProcessed=TRUE; m49)cK?  
    } 7{p,<Uz<"U  
   } + 5 05  
  } G-Y8<mEh  
  else if((lParam&0xc000ffff)==1){ //有键按下 Baq&>]  
   switch(wParam) s01n[jQ  
   { x]F:~(P  
    case VK_MENU: N^O.P  
     MaskBits|=ALTBIT; V ] Z{0  
     break; ,Q^.SHP8  
    case VK_CONTROL: }4$UlTA'  
     MaskBits|=CTRLBIT; 1"i/*}M  
     break; H=*;3gM,'  
    case VK_SHIFT: l{kum2DT  
     MaskBits|=SHIFTBIT; |_Vlw&qu+  
     break; f- _~rQ  
    default: //judge the key and send message 1;>J9  
     break; sVGyHA  
   } m'Ran3rp  
   for(int index=0;index<MAX_KEY;index++){ Ug/b;( dJ'  
    if(hCallWnd[index]==NULL) qg|SBQ?6  
     continue; ]c*&5c$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aK 'BC>uFI  
    { =ove#3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /op8]y  
     bProcessed=TRUE; E<0Y;tR  
    } "Ln)v   
   } j2V^1  
  } WxFVbtw  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HG{OkDx]fl  
   for(int index=0;index<MAX_KEY;index++){ 2|m461   
    if(hCallWnd[index]==NULL) |SCO9,Fs  
     continue; '};pu;GA7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2WqjNqx)6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^`ny]3JA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?8pRRzV$  
   } K;Fy&p^d  
  } L)kwMk  
 } :GK]"sNC  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G{)2f &<  
} l1nrJm8  
: W^ k3/t  
  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: 9[T}cN=|  
rQCj^=cf;~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ju# - >]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Dz8)u:vRS  
',~,hJ0  
  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: I~|.Re9a  
y$'(/iyz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ApR>b%  
{ *{ 6{ZKM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) xO{yr[x"L  
 { DYx3 NDX7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 it \3-  
  SaveBmp(); oUoDj'JN{  
  return FALSE; yHe%e1  
 } rjz$~(&m6  
 …… //其它处理及默认处理 :A"GO c,  
} 4;=+qb  
741Sd8  
*6<<6f`(  
  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。 ,Tjc\;~%  
_ ZMoPEW  
  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。 Q3T@=z2j%  
@X5F$=aqZr  
  二、编程步骤 g\:(1oY  
&]tZ6  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0w)Gb}o$  
' >4 H#tu  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WS6'R    
V^apDV\AV  
  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; /6QwV->  
*> LA30R*v  
  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; n 'gU  
ir !/{IQx  
  5、 添加代码,编译运行程序。 p?PK8GL  
vnc- W3N  
三、程序代码 b1\.hi  
F!ZE4S_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ^ZuwUuuf  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ebfT%_N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 05hjC  
#if _MSC_VER > 1000 LD/NMb  
#pragma once ~>SqJ&-moo  
#endif // _MSC_VER > 1000 :Y>FuE  
#ifndef __AFXWIN_H__ hh#p=Y(f  
#error include 'stdafx.h' before including this file for PCH 9X/]O<i,Es  
#endif Kjzo>fIC{  
#include "resource.h" // main symbols PUcxlD/a}  
class CHookApp : public CWinApp "Rc Ny~  
{ i24t$7q  
 public: eCFMWFhC  
  CHookApp(); ma TQ 0GX  
  // Overrides 4 ))ZBq?  
  // ClassWizard generated virtual function overrides A*^aBWFR  
  //{{AFX_VIRTUAL(CHookApp) /F@CrNFb(  
 public: e|> 5 R  
  virtual BOOL InitInstance(); &Ql$7: r  
  virtual int ExitInstance(); #|8Ia:=s  
  //}}AFX_VIRTUAL >UNx<=ry  
  //{{AFX_MSG(CHookApp) z* k(` '  
  // NOTE - the ClassWizard will add and remove member functions here. h>k[  
  // DO NOT EDIT what you see in these blocks of generated code ! < #FxI  
  //}}AFX_MSG h(C@IIO^;G  
  DECLARE_MESSAGE_MAP() ]"ou?ot }  
}; s k_TKN`+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); y90wL U9f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =hY9lxW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,i)wS1@  
BOOL InitHotkey(); zCji]:  
BOOL UnInit(); 18nT Iz_  
#endif @k+ K_gR  
/Ixv{H)H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. f*o+g:]3  
#include "stdafx.h" :_k5[KT.]9  
#include "hook.h" |tN:o= 6  
#include <windowsx.h> hg7^#f95u  
#ifdef _DEBUG Zz/ z7~{  
#define new DEBUG_NEW WYJH+"@%j  
#undef THIS_FILE F ~SA3M:  
static char THIS_FILE[] = __FILE__; L%;fYi;n  
#endif 45Hbg  
#define MAX_KEY 100 q\Q'9Rl0(  
#define CTRLBIT 0x04 7K5 tBUNQ  
#define ALTBIT 0x02 `NySTd)\  
#define SHIFTBIT 0x01 B_mT[)ut  
#pragma data_seg("shareddata") *[Im].  
HHOOK hHook =NULL; rHiBW!  
UINT nHookCount =0; F/ o }5H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?[?;%Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;vG%[f`K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 7y4jk  
static int KeyCount =0; \&/V p`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X6<Ds'I  
#pragma data_seg() l#IN)">1  
HINSTANCE hins; YJGP8  
void VerifyWindow(); otA'+4\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G4rd<V0[D  
//{{AFX_MSG_MAP(CHookApp) ^u(-v/D9  
// NOTE - the ClassWizard will add and remove mapping macros here. "% l``  
// DO NOT EDIT what you see in these blocks of generated code! [nA1WFfM  
//}}AFX_MSG_MAP %0Ibi  
END_MESSAGE_MAP() BEtFFi6ot  
!LM9  
CHookApp::CHookApp() FQBE1h@k0u  
{ @d|3c7` A  
 // TODO: add construction code here, 2Q%*` vCuV  
 // Place all significant initialization in InitInstance U4=m>Ty  
}  qC6@  
n|fKwWB\  
CHookApp theApp; *b7evU *1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) % oJH 6F  
{ ]TVc 'G;  
 BOOL bProcessed=FALSE; _1G;!eO  
 if(HC_ACTION==nCode) 'i <%kL@  
 { &$bcB]C\3  
  if((lParam&0xc0000000)==0xc0000000){// Key up '>cZ7:  
   switch(wParam) 068DC_  
   { & LhQr-g  
    case VK_MENU: T]x]hQ  
     MaskBits&=~ALTBIT; k%R(Qga  
     break; qnFg7X>C,  
    case VK_CONTROL: c+{ ar^)*  
     MaskBits&=~CTRLBIT; W2 {4s 1  
     break; .On3ZN  
    case VK_SHIFT: vddl9"V)  
     MaskBits&=~SHIFTBIT; C<#_1@^:8e  
     break; h t3P@;  
    default: //judge the key and send message =6a=`3r!I  
     break; G/ H>M%M  
   } b ,x$wP+  
   for(int index=0;index<MAX_KEY;index++){ b#-=Dbe  
    if(hCallWnd[index]==NULL) E|3[$?=R  
     continue; / hg)=p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r{{5@  
    { .P#t"oW}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); + B<7]\\M  
     bProcessed=TRUE; N6Dv1_c,  
    } MU4BAN   
   } 87F]a3  
  } e=+q*]>  
  else if((lParam&0xc000ffff)==1){ //Key down G\R6=K:f7  
   switch(wParam) %Z8wUG  
   { T|p%4hH  
    case VK_MENU: r6&+pSA>  
     MaskBits|=ALTBIT; @=OX7zq\h-  
     break; _7b4+ L  
    case VK_CONTROL: h.\p+Qw.  
     MaskBits|=CTRLBIT; a4XK.[O  
     break; MoXai0d%  
    case VK_SHIFT: jX .' G   
     MaskBits|=SHIFTBIT; Gd`s01GKQ  
     break; +TAyCxfmt  
    default: //judge the key and send message ]c1#_MW  
     break; kzVK%[/  
   } wlQ @3RN>  
   for(int index=0;index<MAX_KEY;index++) p+228K ;H  
   { .l,]yWwfK  
    if(hCallWnd[index]==NULL) Y4+iNdd  
     continue; *x_e] /}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )X3 |[4R  
    { V@+X4`T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h1y3gl[;TD  
     bProcessed=TRUE; {mY=LaS<  
    } 2UopGxrPKw  
   } =3nA5'UZ  
  } vR (nd  
  if(!bProcessed){ vuZ'Wo:S{  
   for(int index=0;index<MAX_KEY;index++){ W6RjQ1  
    if(hCallWnd[index]==NULL) ?w&?P}e +  
     continue; dkW7k^g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pgW^hj\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %jJIR88  
   } Q9c*I,O j  
  } QRx9;!~b}  
 } 3vkzN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "MD 6<H  
} A@;{ #.O  
mKoDy`s  
BOOL InitHotkey() ['Qh#^p  
{ If8Lt}-  
 if(hHook!=NULL){ ]z]=?;ty%  
  nHookCount++; \TLfLqA  
  return TRUE; Jpy~5kS  
 } pq%inSY  
 else ol~ tfS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~i.rk#{?D  
  if(hHook!=NULL) EN__C$  
   nHookCount++; KpIY>k  
  return (hHook!=NULL); fm$Qd^E|e  
} !^EA}N.u  
BOOL UnInit() N'PK4:  
{ ~Lq`a@]A  
 if(nHookCount>1){ %.wx]:o  
  nHookCount--; )LNKJe+  
  return TRUE; P`S'F_IN  
 } l3y}nh+ 8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3BAQ2S}  
 if(unhooked==TRUE){ 7%&e4'SZO  
  nHookCount=0; Od~ e*gA8  
  hHook=NULL; *q;83\  
 } qW /&.  
 return unhooked; {].]`#4Jx  
} nGsFt.  
q^uCZnkb=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NZlCn:"  
{ [!Djs![O  
 BOOL bAdded=FALSE; >;#rK@*&  
 for(int index=0;index<MAX_KEY;index++){ Y5P9z{X=  
  if(hCallWnd[index]==0){ ERIF#EY  
   hCallWnd[index]=hWnd; Js.G hTs  
   HotKey[index]=cKey; +HjSU2  
   HotKeyMask[index]=cMask; Zad>i w}  
   bAdded=TRUE; S_^;#=_c  
   KeyCount++; =iB$4d2  
   break; ;Zc0imYL  
  } qxcTY|&  
 } N8,g~?r^  
 return bAdded; "Z~@"JLb%  
} t3*.Bm:^  
}2^qM^,0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W e*uZ?+  
{ $@w ,9J\  
 BOOL bRemoved=FALSE; ^E)8Sb9t  
 for(int index=0;index<MAX_KEY;index++){ Galh _;=  
  if(hCallWnd[index]==hWnd){ m|;gl|dTB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m8eoD{  
    hCallWnd[index]=NULL; y3bL\d1  
    HotKey[index]=0; +Y2D @K?)  
    HotKeyMask[index]=0; :GFK |  
    bRemoved=TRUE; I]42R;Sc  
    KeyCount--; q"WfKz!U  
    break; D( y c  
   } #TV #*  
  } o=PW)37>  
 } AG#Mj(az!  
 return bRemoved; 1;!dTh  
} Pa=xc>m^  
L>lxkq8!Q  
void VerifyWindow() [h>A<O  
{ k^#*x2b  
 for(int i=0;i<MAX_KEY;i++){ ^f 0-w`D  
  if(hCallWnd!=NULL){ iG"1~/U  
   if(!IsWindow(hCallWnd)){ E_P,>f  
    hCallWnd=NULL; Pj*]%V  
    HotKey=0; |h&okR+_,  
    HotKeyMask=0; ezhfKt]j  
    KeyCount--; G7KOJZb+D  
   } %|ioNXMu  
  } UMMGT6s,E8  
 } IR&b2FTcU  
} 6BZi4:PDx  
L+mHeS l  
BOOL CHookApp::InitInstance() #KuBEHr  
{ :bCswgd[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wzcv[C-x  
 hins=AfxGetInstanceHandle(); :H]MMe  
 InitHotkey(); LG{50sP`  
 return CWinApp::InitInstance(); $O fZp<M  
} .&Sjazk0XO  
0IHAoV60  
int CHookApp::ExitInstance() \5a;_N[Ed  
{ AbQ nx%$u  
 VerifyWindow(); Fr<tk^~/  
 UnInit(); ~wcp&D  
 return CWinApp::ExitInstance(); K_;?Sr=  
} [<}W S} .  
zFY$^Oz"_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +x?8\  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) };'~@%U]/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .R#<Q  
#if _MSC_VER > 1000 kt7Emb}  
#pragma once aU#r`D@0  
#endif // _MSC_VER > 1000 !, sQB_09C  
'oM=ZU8wo  
class CCaptureDlg : public CDialog NFG~PZ`6R  
{ YpG6p0 nd  
 // Construction M"Z/E>ne  
 public: @udc/J$  
  BOOL bTray; kk OjAp{<t  
  BOOL bRegistered; '*`1uomeo  
  BOOL RegisterHotkey(); zQB1C  
  UCHAR cKey; sdKm@p|/|  
  UCHAR cMask; [vnxp/v/<  
  void DeleteIcon(); |-%dN }O  
  void AddIcon(); yb\!4ml  
  UINT nCount; :>jzL8  
  void SaveBmp(); ']H*f2y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0OnqKgf  
  // Dialog Data n8q%>.i7  
  //{{AFX_DATA(CCaptureDlg) Z5*O\kJv  
  enum { IDD = IDD_CAPTURE_DIALOG };   [ L  
  CComboBox m_Key;  ,0i72J  
  BOOL m_bControl; MB6lKLy6~  
  BOOL m_bAlt; nFefDdP  
  BOOL m_bShift; @-ir  
  CString m_Path; Q.V+s   
  CString m_Number;  ~!e(e2  
  //}}AFX_DATA ApcE)mjpc  
  // ClassWizard generated virtual function overrides ^~3{n  
  //{{AFX_VIRTUAL(CCaptureDlg) !F2JT@6  
 public: kPSi6ci  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >^v,,R8j  
 protected: }To-c'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7!e kINQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /g!X[rn7Q  
  //}}AFX_VIRTUAL D6'-c#  
  // Implementation o KY0e&5  
 protected: 2W/*1K}  
  HICON m_hIcon; l5U^lc  
  // Generated message map functions r90R~'5x9  
  //{{AFX_MSG(CCaptureDlg) +1eb@b X  
  virtual BOOL OnInitDialog(); wFJ*2W:  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y )7;"3Q<  
  afx_msg void OnPaint(); = d!YM6G  
  afx_msg HCURSOR OnQueryDragIcon(); C`aUitL}  
  virtual void OnCancel(); OjK+`D_C  
  afx_msg void OnAbout(); Tq%##  
  afx_msg void OnBrowse(); ~-A"M_n ?  
  afx_msg void OnChange(); =05jjR1  
 //}}AFX_MSG Qqp=  
 DECLARE_MESSAGE_MAP() Nu><r  
}; 3IoN.  
#endif \~T&C5  
G%%5lw!y'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c}2"X,  
#include "stdafx.h" )2F%^<gZ#  
#include "Capture.h" hM8FN  
#include "CaptureDlg.h" T 0?9F2  
#include <windowsx.h> (V`ddP-  
#pragma comment(lib,"hook.lib") ~b 9fk)z!  
#ifdef _DEBUG .zJZ*\2ob  
#define new DEBUG_NEW WwLV^m]  
#undef THIS_FILE &Z+.FTo  
static char THIS_FILE[] = __FILE__; NDG?X s [2  
#endif "ZG2olOqLI  
#define IDM_SHELL WM_USER+1 [t]q#+Zs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n%{oFTLCo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *#B"%;Ln  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V|;os  
class CAboutDlg : public CDialog D ~NWP%H  
{ ASr3P5/  
 public: x' 3kHw  
  CAboutDlg(); %;O# y3,  
  // Dialog Data okBaQH2lUl  
  //{{AFX_DATA(CAboutDlg) B,A\/%<  
  enum { IDD = IDD_ABOUTBOX }; '~pZj"uy  
  //}}AFX_DATA ^!K 8nW{*  
  // ClassWizard generated virtual function overrides E{'\(6z_  
  //{{AFX_VIRTUAL(CAboutDlg) (=tu~ ^  
 protected: 8qs8QK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rU7t~DKS  
  //}}AFX_VIRTUAL 9|>5;Ej  
  // Implementation T{Yk/Z/}?  
 protected: *35o$P46  
  //{{AFX_MSG(CAboutDlg) wtfM }MW\  
  //}}AFX_MSG D!bi>]Yd  
  DECLARE_MESSAGE_MAP() <-!' V,c  
}; [Ib17#74  
u6/;=]0   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0Pg@%>yb~  
{ n:%A4*  
 //{{AFX_DATA_INIT(CAboutDlg) !jN$U%/,%.  
 //}}AFX_DATA_INIT SXmh@a"*\  
} Cx8  H  
.Mzrj{^Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vpu   
{ NqN9  
 CDialog::DoDataExchange(pDX);  83:qIfF  
 //{{AFX_DATA_MAP(CAboutDlg) \3cg\Q+~  
 //}}AFX_DATA_MAP OLDEB.@  
} UG,n q  
{ALOs^_-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Y67i\U>?  
 //{{AFX_MSG_MAP(CAboutDlg) CdiL{zH\3  
 // No message handlers _B\X&!G.  
 //}}AFX_MSG_MAP #M8>)oc  
END_MESSAGE_MAP() Jl89}Sf  
Y1 6pT  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) =L}$#Y8?  
: CDialog(CCaptureDlg::IDD, pParent) aGmbB7[BZ  
{ 7 6S>xnN  
 //{{AFX_DATA_INIT(CCaptureDlg) rXnG"A  
  m_bControl = FALSE; GC~N$!*  
  m_bAlt = FALSE; +Z%8X!Q  
  m_bShift = FALSE; t Ow[  
  m_Path = _T("c:\\"); b/eo]Id]  
  m_Number = _T("0 picture captured."); avH3{V  
  nCount=0; Bh!J&SM:  
  bRegistered=FALSE; ^r~R]stE^  
  bTray=FALSE; i<{/r-w=E  
 //}}AFX_DATA_INIT Z/I`XPmk  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R]_fe4Y0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hFt~7R  
} 2pAshw1G  
QEl~uhc3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H3q L&xL  
{ :,=Z)e  
 CDialog::DoDataExchange(pDX); & /lmg!6  
 //{{AFX_DATA_MAP(CCaptureDlg) /M~rmIks  
  DDX_Control(pDX, IDC_KEY, m_Key); p2o6 6t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); IR*:i{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); xqaw00,s  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); hin6cac  
  DDX_Text(pDX, IDC_PATH, m_Path); OTwXc*2u]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h3kBNBI )  
 //}}AFX_DATA_MAP 1z=}`,?>  
} WFFpW{  
~uu~NTz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) " qrL:,   
//{{AFX_MSG_MAP(CCaptureDlg) %b`B.A  
 ON_WM_SYSCOMMAND() 0qD.OF)8  
 ON_WM_PAINT() .@]M'S^1  
 ON_WM_QUERYDRAGICON() ^b(> Bg )T  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MYeGr3V3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c9;oB|8|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) gc{5/U9H*  
//}}AFX_MSG_MAP .A Z+|?d  
END_MESSAGE_MAP() cOEzS  
FI(M 1iJ  
BOOL CCaptureDlg::OnInitDialog() K?aUIkVs  
{ V3}$vKQ  
 CDialog::OnInitDialog(); =6+j Po{F  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U HUO9h  
 ASSERT(IDM_ABOUTBOX < 0xF000); rzgzX  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Zu%oIk  
 if (pSysMenu != NULL) vW4N[ .+  
 { \Rvsy;7  
  CString strAboutMenu; Bn{0-5nj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?GKm_b]JC  
  if (!strAboutMenu.IsEmpty()) F`YxH*tO7  
  { Z'z~40Bda  
   pSysMenu->AppendMenu(MF_SEPARATOR); S~ 3|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _i{4 4zE  
  } VR0#"  
 } quw:4W>  
 SetIcon(m_hIcon, TRUE); // Set big icon oM#S.f?  
 SetIcon(m_hIcon, FALSE); // Set small icon ^7~w yAr  
 m_Key.SetCurSel(0); V/7?]?!xu  
 RegisterHotkey(); prg8Iq'w  
 CMenu* pMenu=GetSystemMenu(FALSE); $U/_8^6B0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  !#8=tO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4Vi&Y')f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); q! U'DDEP  
 return TRUE; // return TRUE unless you set the focus to a control 7?JcB?G4  
} }D eW2Jp  
m =2e1wc  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) LlG~aGhel  
{ 8?7:sfc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) iP~dH/B|v  
 { >w=xGb7  
  CAboutDlg dlgAbout; D?"TcA  
  dlgAbout.DoModal(); }~28UXb23  
 } f*SAbDE  
 else  g8_IZ(%:  
 { &vp0zYd+v  
  CDialog::OnSysCommand(nID, lParam); #FV(a~  
 } !Rw\k'<GKX  
} #i GRi!$h  
&c!=< <5M  
void CCaptureDlg::OnPaint() 8W_X&X?Q  
{ XOy#? X/`  
 if (IsIconic()) 'Kj8X{BSFb  
 { oos35xV .  
  CPaintDC dc(this); // device context for painting 5&r2a}K  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z[wk-a+w  
  // Center icon in client rectangle Kv:ih=?  
  int cxIcon = GetSystemMetrics(SM_CXICON); Zb7:qe<UN  
  int cyIcon = GetSystemMetrics(SM_CYICON); $0zH2W  
  CRect rect; gZs8BKO  
  GetClientRect(&rect); (7rG~d1iS  
  int x = (rect.Width() - cxIcon + 1) / 2; lFY;O !Y5\  
  int y = (rect.Height() - cyIcon + 1) / 2; f V.(v&  
  // Draw the icon prY9SQd  
  dc.DrawIcon(x, y, m_hIcon); ]X)EO49  
 } ^$y_~z3o#7  
 else BE }qwP^  
 { (IR'~ :W  
  CDialog::OnPaint(); k|7XC@i]%  
 } 'm=9&?0S  
} a;Y9wn  
(Rk g  
HCURSOR CCaptureDlg::OnQueryDragIcon() w`Dzk. 2  
{ EF{_-FXY  
 return (HCURSOR) m_hIcon; Q'^]lVY  
} -~h2^Oez  
.j4IW 3)  
void CCaptureDlg::OnCancel() 5aTyM_x  
{ mYk5f_}  
 if(bTray) 4>^ %_Xj[  
  DeleteIcon(); QE5 85s5  
  CDialog::OnCancel(); 2'J.$ h3  
} -K/' }I  
kc8T@5+I0  
void CCaptureDlg::OnAbout() *R>I%?]V3  
{ * #;rp~  
 CAboutDlg dlg; xTM&SVNbL_  
 dlg.DoModal(); <96ih$5D1  
} [:!#F7O-  
,9"</\]`  
void CCaptureDlg::OnBrowse() <S0!$.Kg*<  
{ TR@$$RrU  
 CString str; "O|fX\}5  
 BROWSEINFO bi; 6SsZK)X  
 char name[MAX_PATH]; t Q_}o[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); M42D5|tZc  
 bi.hwndOwner=GetSafeHwnd(); # dxlU/*  
 bi.pszDisplayName=name; g m],  
 bi.lpszTitle="Select folder"; s:cS 9A8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0tB9X9:,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Zk}e?Grc  
 if(idl==NULL) ?#D@e5Wf  
  return; YKl!M/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,^o^@SI)   
 str.ReleaseBuffer(); mXF pGo5 s  
 m_Path=str; <z)MV oa  
 if(str.GetAt(str.GetLength()-1)!='\\') zAB-kE\ )  
  m_Path+="\\"; [;5HI'px  
 UpdateData(FALSE); qg6Hk:^r  
} ,l7ty#j  
h2aJa@;S  
void CCaptureDlg::SaveBmp() Ok({Al1A,w  
{ 60AX2-sdJ,  
 CDC dc; o<P%|>qX  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); L +.K}w  
 CBitmap bm; G68N@g  
 int Width=GetSystemMetrics(SM_CXSCREEN); T:.J9  
 int Height=GetSystemMetrics(SM_CYSCREEN); n3b@ 6V1_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w6Tb<ja  
 CDC tdc; ~`_nw5y  
 tdc.CreateCompatibleDC(&dc); .#WF'  
 CBitmap*pOld=tdc.SelectObject(&bm); '}4[m>/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2#W%--  
 tdc.SelectObject(pOld); )vGRfFjw_  
 BITMAP btm; p7H*Ff`  
 bm.GetBitmap(&btm); >Q5E0 !]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^ad> (W  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 6o A0a\G'  
 BITMAPINFOHEADER bih; NK#Dq&W+&  
 bih.biBitCount=btm.bmBitsPixel; [EGE|   
 bih.biClrImportant=0; $X*$,CCIB  
 bih.biClrUsed=0; *bRH,u  
 bih.biCompression=0; ^QW%< X  
 bih.biHeight=btm.bmHeight; R!pV`N  
 bih.biPlanes=1; gi;V~>kh  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6u:5]e8  
 bih.biSizeImage=size; oS,<2Z  
 bih.biWidth=btm.bmWidth; Dh +^;dQ6  
 bih.biXPelsPerMeter=0; PL+fLCk,I  
 bih.biYPelsPerMeter=0; ={L:q8v)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,CM$A}7[  
 static int filecount=0; Tu/JhP/g,`  
 CString name; l3iL.?&Pa  
 name.Format("pict%04d.bmp",filecount++); 053W2Si   
 name=m_Path+name; H#Og0gEE}5  
 BITMAPFILEHEADER bfh; .=@M>TZM  
 bfh.bfReserved1=bfh.bfReserved2=0; dqKTF_+VhA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +Qc^A  
 bfh.bfSize=54+size; p Y>yJ)  
 bfh.bfOffBits=54; Ca1)>1 Vz  
 CFile bf; u5CT7_#)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o!\O)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ]B,S<*h  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); b0t];Gc%b  
  bf.WriteHuge(lpData,size); H8-,gV  
  bf.Close(); %] #; ~I%  
  nCount++; Yaa M-o  
 } q75F^AvH  
 GlobalFreePtr(lpData); 09%eaoW  
 if(nCount==1) %74 Ms  
  m_Number.Format("%d picture captured.",nCount); hU=J^Gi0  
 else Z(}x7jzW  
  m_Number.Format("%d pictures captured.",nCount); )uX:f8  
  UpdateData(FALSE); XIp9=jhSR  
} [#9ij3vxd  
C,I N+@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Gg.w-&  
{ v"F0$c  
 if(pMsg -> message == WM_KEYDOWN) {YGz=5^  
 { ?Y hua9  
  if(pMsg -> wParam == VK_ESCAPE) 3mm`8!R  
   return TRUE; IYQYW.`ly  
  if(pMsg -> wParam == VK_RETURN) Dh9-~}sW'  
   return TRUE; wyc,Ir  
 } ~AE034_N  
 return CDialog::PreTranslateMessage(pMsg); EhD|\WLx!  
} 2Qy!Aa  
yZ!Eu#81  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }zobIfIF  
{ &J~S  $  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %~W}262  
  SaveBmp(); ?&GMp[  
  return FALSE; f^%E]ki  
} y1 }d(%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3tm z2JIb  
 CMenu pop; x# YOz7.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Czci6 Lz  
 CMenu*pMenu=pop.GetSubMenu(0); Sm Ei _u]'  
 pMenu->SetDefaultItem(ID_EXITICON); f<}!A$wd  
 CPoint pt; n]$vCP  
 GetCursorPos(&pt); 5AjK7[<L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |@@mq!>-  
 if(id==ID_EXITICON) ./fEx 'E  
  DeleteIcon(); ~F(+uJbO  
 else if(id==ID_EXIT) RV$+g.4  
  OnCancel(); "FXS;Jf  
 return FALSE; tAC,'im:*  
}  CMg83  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rvmI 8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KOmP-q=6  
 AddIcon(); ,X$Avdc2  
 return res; 6Ss{+MF|v  
} }agl:~C  
g-:)} 8d6  
void CCaptureDlg::AddIcon() kK1qFe?]  
{ {&<}*4D  
 NOTIFYICONDATA data; k0YsAa#6V  
 data.cbSize=sizeof(NOTIFYICONDATA); ~o%-\^oc  
 CString tip; N{`l?t0I  
 tip.LoadString(IDS_ICONTIP); FSQ&J|O  
 data.hIcon=GetIcon(0); 2s4=%l  
 data.hWnd=GetSafeHwnd(); DdQf %W8u  
 strcpy(data.szTip,tip); fM|g8(TK,  
 data.uCallbackMessage=IDM_SHELL; bK].qN  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !}P FiT^  
 data.uID=98; GY",AL8f  
 Shell_NotifyIcon(NIM_ADD,&data); kIfb!  
 ShowWindow(SW_HIDE); \G=E%aK  
 bTray=TRUE; dI 5sqM:  
} 8x9kF]=  
5"gRz9Ta`  
void CCaptureDlg::DeleteIcon() ATzNV=2s  
{ ZKR z=(  
 NOTIFYICONDATA data; (k5DbP[  
 data.cbSize=sizeof(NOTIFYICONDATA); wr$}AX  
 data.hWnd=GetSafeHwnd(); XF7W'^  
 data.uID=98; :HE]P)wz-  
 Shell_NotifyIcon(NIM_DELETE,&data); `;_tt_  
 ShowWindow(SW_SHOW); ^i8I 1@ =  
 SetForegroundWindow(); #w*pWD^  
 ShowWindow(SW_SHOWNORMAL); lQsQRp  
 bTray=FALSE; B![5+  
} YT5>pM-%  
4'd{H Rs  
void CCaptureDlg::OnChange() #LN I&5  
{ PD}R7[".>  
 RegisterHotkey(); _RW[]MN3*  
} psZeu*/r  
bF KP V%`  
BOOL CCaptureDlg::RegisterHotkey() >Y/[zf I2  
{ y\_S11{v  
 UpdateData(); p\{+l;`  
 UCHAR mask=0; X]yERaJ,i  
 UCHAR key=0; 87K)qsv8  
 if(m_bControl) ]v{fFmL  
  mask|=4; fMQ*2zGu95  
 if(m_bAlt) UC1!J =f  
  mask|=2; +r0eTP=zf  
 if(m_bShift) 4{DeF@@  
  mask|=1; yo*iv+l  
  key=Key_Table[m_Key.GetCurSel()]; /,Rca1W  
 if(bRegistered){ nFfCw%T?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ' 4~5ez|:  
  bRegistered=FALSE; )KqR8UO  
 } X}*o[;2G  
 cMask=mask; aVP|:OAj  
 cKey=key; >jX UO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Hk]BC  
 return bRegistered; VDTY<= Q  
} hf<$vRti>  
UPKi/)C;  
  四、小结 Y(y 9l{'  
W"kw>JEt  
  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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