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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: ?|,-Bft3  
  asd3J  
  一、实现方法 y$6~&X  
/_.1f|{B  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 1b4/  
&2\^S+4  
#pragma data_seg("shareddata") 7ts`uI<E@7  
HHOOK hHook =NULL; //钩子句柄 X8Y)5,`s  
UINT nHookCount =0; //挂接的程序数目 (>a8h~Na  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^DH*\ee  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vn Ol-`Z ~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey M'-Z"  
static int KeyCount =0; I5mtr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D,sb {N  
#pragma data_seg() c|KN@)A  
ll8Zo+-[  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 (dgBI}Za  
<yxy ;o  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 3tu:Vc.:M  
49d02AU%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \~~y1.,U.  
cKey,UCHAR cMask) S&Szc0-|k  
{ 5vo5t0^o  
 BOOL bAdded=FALSE; %&Q9WMo  
 for(int index=0;index<MAX_KEY;index++){ S2,tv  
  if(hCallWnd[index]==0){ #[$zbZ(I>:  
   hCallWnd[index]=hWnd; Iq["(!7E5  
   HotKey[index]=cKey; }ofx?s}  
   HotKeyMask[index]=cMask; aRE%(-5  
   bAdded=TRUE;  ; V)jC  
   KeyCount++; zPn 2  
   break; q\]"}M 8  
  } 2vh@KnNU  
 } UZJ<|[  
 return bAdded; (YC{BM}  
} ![H{ndH!Q  
//删除热键 c[<>e#s+;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Wkj0z ]]?  
{ [8v>jQ)  
 BOOL bRemoved=FALSE; .mwB'Ll  
 for(int index=0;index<MAX_KEY;index++){ T;`2t;  
  if(hCallWnd[index]==hWnd){ vzH"O=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Iy8fN"I9D  
    hCallWnd[index]=NULL; |zCT~#  
    HotKey[index]=0; Z;M th#  
    HotKeyMask[index]=0; " .<>(bE  
    bRemoved=TRUE; A-*y[/  
    KeyCount--; }8&?  
    break; ##r9/`A  
   } unD.t  
  } Ygs:Ox"[-G  
 } 3$f+3/l  
 return bRemoved; zz* *HwRt  
} ]TX"BH"2  
V7(-<})8  
@t{`KB+ ^  
  DLL中的钩子函数如下: r<9G}9  
sEzl4I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YU,fx<c  
{ KJP}0|[  
 BOOL bProcessed=FALSE; (\M#Ay t)  
 if(HC_ACTION==nCode) GJTakhj3  
 { [M/0Qx[,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,`,1s 9\&t  
   switch(wParam) j{&$_  
   {  ,Z$!:U  
    case VK_MENU: p>9|JMk  
     MaskBits&=~ALTBIT; W87kE?,  
     break; [MXyOE  
    case VK_CONTROL: ,,=VF(@G  
     MaskBits&=~CTRLBIT; Ou7nk:I@  
     break; des.TSZ  
    case VK_SHIFT: qe2@bG%2+F  
     MaskBits&=~SHIFTBIT; 'PWX19  
     break; 2|\WaH9P  
    default: //judge the key and send message S8k<}5  
     break; KD^n7+w%  
   } *4OB 88$  
   for(int index=0;index<MAX_KEY;index++){ UZRN4tru6  
    if(hCallWnd[index]==NULL) vw w>]Z}  
     continue; 9}A\Bh tiM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Bg.  
    { ?M B Od9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z>PS>6  
     bProcessed=TRUE; Fk`|?pQm  
    } p)Fi{%bc  
   } ^y.|KA3[  
  } vI \8@97  
  else if((lParam&0xc000ffff)==1){ //有键按下 !uW;Ea?  
   switch(wParam) rH$M6S  
   { o3cE.YUF  
    case VK_MENU: 5$&',v(  
     MaskBits|=ALTBIT; YVLK X}$)(  
     break; ;Iax \rQ  
    case VK_CONTROL: 4L/nEZ!Nsu  
     MaskBits|=CTRLBIT; 'OI(MuSn  
     break; Jp"[` m  
    case VK_SHIFT: 9c{T|+ ]  
     MaskBits|=SHIFTBIT; F/u i(4  
     break; ijACfl{!:t  
    default: //judge the key and send message dR!x)oO=  
     break; )(+q~KA}  
   } U8OVn(qV  
   for(int index=0;index<MAX_KEY;index++){ \ 0/m$V.  
    if(hCallWnd[index]==NULL) p0Pmmp7r  
     continue; G * =>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VQ;'SY:`  
    { }CM#jN?(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %$'Z"njO&  
     bProcessed=TRUE; }poLH S/  
    } *nB-] w/  
   } m:Fdgu9  
  } 0-:dzf  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3,0b<vfSv  
   for(int index=0;index<MAX_KEY;index++){ HdRwDW@7=  
    if(hCallWnd[index]==NULL) Ys]cJ]  
     continue; nT9Hw~f<j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PQ2rNY6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {~`{bnx^]7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?OFfU  4  
   } M>ntldV#g%  
  } 'HJ<"<  
 } ,z~"Mst  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r0s(MyI  
} qNWSDZQ  
?Xj@Sx  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: umN4|X  
^t?vv;@}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LKgo(&mY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {7Hc00FM  
C8%MKNPd  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: %awr3h>$  
S 59^$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lE$(*1H  
{ S^iT &;,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) O-ppR7edh  
 { R-tZC9 @  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r-No\u_  
  SaveBmp(); UAGh2?q2  
  return FALSE; gOr%N!5  
 } U+[h^M$U  
 …… //其它处理及默认处理 qfqL"G  
} ]U&<y8Q_6  
q+ `QiPj  
5 p ,HkV  
  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。 Y*sw;2Z;a  
"A0y&^4B@  
  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。 |>b;M ,`OO  
y"k %Wa`*  
  二、编程步骤 /4;Sxx-  
vXg^K}a#  
  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"; <j1r6.E)  
qL5~Wr m-W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +&G]\WX<  
T(Ji%S >  
  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; Js^(mRv=  
[x'D+!  
  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; >J#/IjCW  
N~P1^x~  
  5、 添加代码,编译运行程序。 mV+9*or  
v6ei47-  
三、程序代码 n. vrq-  
)Myx(w"S  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL '7g]@Q7  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) lYmxd8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $xis4/2  
#if _MSC_VER > 1000 9CAu0N5<  
#pragma once i(kx'ua?  
#endif // _MSC_VER > 1000 ;U#=H9_  
#ifndef __AFXWIN_H__ -/Zy{2 <u  
#error include 'stdafx.h' before including this file for PCH -@@ O<M^  
#endif DB}v..  
#include "resource.h" // main symbols +No` 89Y  
class CHookApp : public CWinApp ibLx'<  
{ pG22Nx  
 public: WWC&-Ni  
  CHookApp(); ~[=d{M!$W  
  // Overrides +U4';[LG1C  
  // ClassWizard generated virtual function overrides VQ8Fs/Zt!  
  //{{AFX_VIRTUAL(CHookApp) #CcEI  
 public: t{,e{oZx  
  virtual BOOL InitInstance(); pu_?) U  
  virtual int ExitInstance(); c}s#!|E0v  
  //}}AFX_VIRTUAL z]D/Qr  
  //{{AFX_MSG(CHookApp) !s:_>P`MQ  
  // NOTE - the ClassWizard will add and remove member functions here. B>c2 *+Bk  
  // DO NOT EDIT what you see in these blocks of generated code ! V+r&Z<&  
  //}}AFX_MSG '}:(y$9.`  
  DECLARE_MESSAGE_MAP() TpI8mDO\W  
}; 0|g@; Pc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D5:|CMQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0O>M/ *W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %<8r`BMo  
BOOL InitHotkey(); 3!%-O:!  
BOOL UnInit(); E!uQ>'iq.  
#endif *3s-=.U~  
|oSqy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. K_k'#j~*?  
#include "stdafx.h" |kD69 }sG  
#include "hook.h" 5,-:31(j\  
#include <windowsx.h> H[}lzL)  
#ifdef _DEBUG ?zfm"o  
#define new DEBUG_NEW Pz\ByD  
#undef THIS_FILE iP@ FXJJ  
static char THIS_FILE[] = __FILE__; s3  fQGbU  
#endif ` TH\0/eE  
#define MAX_KEY 100 /qMiv7m~Q  
#define CTRLBIT 0x04 ]z#)XW3#i  
#define ALTBIT 0x02 C6Cr+TScH  
#define SHIFTBIT 0x01 %m [l/,2x  
#pragma data_seg("shareddata") IusZYB  
HHOOK hHook =NULL; CIf@G>e-  
UINT nHookCount =0; Jfo'iNOu  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l]j;0i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT M8$e MS1  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 947;6a%$  
static int KeyCount =0; :X:s'I4J D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift u~>G8y)k9O  
#pragma data_seg() <L<^uFB  
HINSTANCE hins; ><xmw=  
void VerifyWindow(); Ep:hObWG)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5Ar gM%  
//{{AFX_MSG_MAP(CHookApp) Z>3m-:-e  
// NOTE - the ClassWizard will add and remove mapping macros here. *e<}hm Dr  
// DO NOT EDIT what you see in these blocks of generated code! 'X6Z:dZY  
//}}AFX_MSG_MAP 4O.R=c2}7>  
END_MESSAGE_MAP() HF"TS*  
*$`N5;7'`  
CHookApp::CHookApp() G!wb|-4<$  
{ 1Kr$JIcd  
 // TODO: add construction code here, 2 |JEGyDS-  
 // Place all significant initialization in InitInstance k+*pg4 '  
} _l1"X^Aa  
oI'& &Bt  
CHookApp theApp; .lM]>y)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ul6|LTY  
{ '.<c[Mp  
 BOOL bProcessed=FALSE; byMy- v;  
 if(HC_ACTION==nCode) A{M7   
 { "K$c9Z8  
  if((lParam&0xc0000000)==0xc0000000){// Key up d R=0K  
   switch(wParam) <&2<>*/.y  
   { m{$}u@a  
    case VK_MENU: <mj/P|P@  
     MaskBits&=~ALTBIT; l9OpaOVfJ  
     break; QgQclML1|  
    case VK_CONTROL: ;yyR_N S  
     MaskBits&=~CTRLBIT; sC.r$K+k5  
     break; O[{/P:a  
    case VK_SHIFT: /xcXd+k]  
     MaskBits&=~SHIFTBIT; 'Bxj(LaV-  
     break; .tppCy  
    default: //judge the key and send message K=E+QvSG  
     break; m#i4_F=^b  
   } AzSu_  
   for(int index=0;index<MAX_KEY;index++){ B~| ]gd  
    if(hCallWnd[index]==NULL) MkjB4:"  
     continue; 5S_fvW;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N ~fE&@-  
    { (5,x5l]-N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5f?GSHA}  
     bProcessed=TRUE; |)" y  
    } 023uAaI^3r  
   } =:zPT;K  
  } c q[nqjC=  
  else if((lParam&0xc000ffff)==1){ //Key down TJZ/lJU  
   switch(wParam) qY'+@^<U;  
   { eThFRU3 F  
    case VK_MENU: l6 }+,v@#  
     MaskBits|=ALTBIT; _+nk3-yQw  
     break; '+ZJf&Ox  
    case VK_CONTROL: Yw]$/oP`  
     MaskBits|=CTRLBIT; B$YoglEW:  
     break; D&I/Tbc  
    case VK_SHIFT: /5z,G r  
     MaskBits|=SHIFTBIT; BD;T>M  
     break; EJMd[hMhe  
    default: //judge the key and send message TwVkI<e0s?  
     break; B!;:,(S~  
   } Mis B&Ok`k  
   for(int index=0;index<MAX_KEY;index++) _9H]:]1QH  
   { Z 4i5,f  
    if(hCallWnd[index]==NULL) .-![ ra  
     continue; l4.ql1BX@y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MRK=\qjD  
    { (*=>YE'V{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lY(_e#  
     bProcessed=TRUE; maY.Z<lN  
    } 0^nF : F  
   } M!mw6';k  
  } kksffzG  
  if(!bProcessed){ 6}Tftw$0z  
   for(int index=0;index<MAX_KEY;index++){ K]Vp! G  
    if(hCallWnd[index]==NULL) o<txm?+N  
     continue; LyNmn.nN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) iGz*4^ %  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9}a$0H h  
   } 'J-a2oiM(  
  } B(vCi^  
 } rc<Ix  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :_:)S  
} ?Js4 \X!uJ  
MUv#8{+F'/  
BOOL InitHotkey() ,7:-V<'Yv  
{ !sEhjJV^7  
 if(hHook!=NULL){ 4e.19H9  
  nHookCount++; 8#tuB8>  
  return TRUE; 1n}#54  
 } ~_"V7  
 else  <82&F  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); SCe$v76p#  
  if(hHook!=NULL) 8! !h6dQgI  
   nHookCount++; @mxaZ5Vv}  
  return (hHook!=NULL); _deEs5i  
} 6| o S 5  
BOOL UnInit() C96*,.j~'  
{ 4e eh+T  
 if(nHookCount>1){ cN?/YkW?]  
  nHookCount--; U{Oo@ztT  
  return TRUE; <-b9 )>  
 } Qk>U=]U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g[t paQ  
 if(unhooked==TRUE){ Sw"h!\c`  
  nHookCount=0;  $RRX-  
  hHook=NULL; ~$C<^?"b  
 } f(blqO.@l  
 return unhooked; %xG<hNw/  
} 1L'Q;?&2H,  
yp^k;G?_d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ok:L]8UN 3  
{ IzUpkwN  
 BOOL bAdded=FALSE; {47l1wV]  
 for(int index=0;index<MAX_KEY;index++){ X=abaKl  
  if(hCallWnd[index]==0){ Cd=$XJ-b  
   hCallWnd[index]=hWnd; 0L8fpGJ  
   HotKey[index]=cKey; "+7E9m6I  
   HotKeyMask[index]=cMask; 9_jiUZFje  
   bAdded=TRUE; WwZ3hd  
   KeyCount++; 7=u Gf$/  
   break; czu9a"M>X  
  } JrLh=0i9  
 } t$Ff $(  
 return bAdded; jVN06,3z  
} .81Y/Gad_  
~&RrlFh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x*'H@!!G  
{ v&/H6r#E.  
 BOOL bRemoved=FALSE; BgUp~zdo  
 for(int index=0;index<MAX_KEY;index++){ tN\I2wm  
  if(hCallWnd[index]==hWnd){ oOvQA W8`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eIF6f& F  
    hCallWnd[index]=NULL; j\bp# +  
    HotKey[index]=0; 5fiWo^s}  
    HotKeyMask[index]=0; )fIG4#%\  
    bRemoved=TRUE; uQx/o ^  
    KeyCount--; n&P~<2^M#  
    break; uI?Z_  
   } iEr?s-or  
  } %CvVu)tc  
 } n YUFRV$  
 return bRemoved; Lp(`m=;O  
} 9{Etv w  
wL, -"  
void VerifyWindow() `|Di?4+6%  
{ D QxuV1  
 for(int i=0;i<MAX_KEY;i++){ '/03m\7  
  if(hCallWnd!=NULL){ :n{{\SSIgX  
   if(!IsWindow(hCallWnd)){ _z BfNz9D  
    hCallWnd=NULL; !a:e=b7g  
    HotKey=0; ElB[k<  
    HotKeyMask=0; XL aD#J  
    KeyCount--; c;X,-Q9  
   } H,GjPIG  
  } OOXSJE1  
 } "h[)5V{  
} e CN:  
5m0lk|`  
BOOL CHookApp::InitInstance() w*/@|r39  
{ aAGV\o{^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .(cpYKFX  
 hins=AfxGetInstanceHandle(); l P=I0A-  
 InitHotkey(); &Lt$~}*&6  
 return CWinApp::InitInstance(); uyk;]EYjHZ  
} 0%L:jq{5  
H.;}%id  
int CHookApp::ExitInstance() DMch88W  
{ FA{Q6fi:2  
 VerifyWindow(); ZpOME@9,  
 UnInit(); 2>k*9kyp  
 return CWinApp::ExitInstance(); wS9V@  
} I9+h-t  
fUWrR1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H{5,  -x  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1irSI,j%z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [@VzpVhXz  
#if _MSC_VER > 1000 J Hm Pa  
#pragma once q|]CA  
#endif // _MSC_VER > 1000 H3R{+7  
XtZd% #2},  
class CCaptureDlg : public CDialog 8[X"XThj  
{ 3]JJCaf  
 // Construction  NnHaHX  
 public: )b]wpEFl  
  BOOL bTray; [efU)O&  
  BOOL bRegistered; hO.b?>3NL  
  BOOL RegisterHotkey(); ,T zlW\?\  
  UCHAR cKey; ;DnUeE8  
  UCHAR cMask; >Q@y8*E\F  
  void DeleteIcon(); *@#Gc%mGu  
  void AddIcon(); nF]R "  
  UINT nCount; @#W4?L*D  
  void SaveBmp(); +l)t5Mg\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor %SIll  
  // Dialog Data Qu'#~#L`  
  //{{AFX_DATA(CCaptureDlg) \VOv&s;h  
  enum { IDD = IDD_CAPTURE_DIALOG }; lv!j  
  CComboBox m_Key; *?1\S^7R  
  BOOL m_bControl; S{e3aqT#N  
  BOOL m_bAlt; `G: 1  
  BOOL m_bShift; '9.@r\g  
  CString m_Path; #Ox@[Z1I  
  CString m_Number; H6K8.  
  //}}AFX_DATA ;Krs*3 s  
  // ClassWizard generated virtual function overrides :PN%'~}n  
  //{{AFX_VIRTUAL(CCaptureDlg) Fyw X  
 public: fOSk > gK  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )O+Zbn  
 protected: af @a /  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tF/Ni*\^rV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;Qt/(/  
  //}}AFX_VIRTUAL nxuH22:  
  // Implementation Wm"#"l4  
 protected: P(@Q[XQ2  
  HICON m_hIcon; QwG_-  
  // Generated message map functions 7DK}c]js  
  //{{AFX_MSG(CCaptureDlg) d\3 %5Y  
  virtual BOOL OnInitDialog(); c9jS !uDMK  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (:E@kpK  
  afx_msg void OnPaint(); -U$;\1--  
  afx_msg HCURSOR OnQueryDragIcon(); )XSHKPTQ1  
  virtual void OnCancel(); ;Q vQ fV4  
  afx_msg void OnAbout(); t`hes $E  
  afx_msg void OnBrowse(); MYVVI1A  
  afx_msg void OnChange(); C"5P7F{  
 //}}AFX_MSG =?y0fLTc  
 DECLARE_MESSAGE_MAP() (r?hD*2r  
}; X8*~Cf73u  
#endif V73/q  
aLW3Ub{h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^.@%n1I"5y  
#include "stdafx.h" pV8tn!  
#include "Capture.h" Io IhQ  
#include "CaptureDlg.h" "S'Yn-  
#include <windowsx.h> v]Pyz<+  
#pragma comment(lib,"hook.lib") lcpiCZ  
#ifdef _DEBUG |/xA5_-N  
#define new DEBUG_NEW ,37<F XX,  
#undef THIS_FILE Q{=r9&&  
static char THIS_FILE[] = __FILE__; W58?t6! =  
#endif l*wGKg"x3  
#define IDM_SHELL WM_USER+1 !9r%d8!z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -:r<sv$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9L-jlAo<  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7>r[.g  
class CAboutDlg : public CDialog ~AaEa,LQ  
{ *v8daF  
 public: }JQy&V%  
  CAboutDlg(); A+H8\ew2,  
  // Dialog Data dJrUcZBr  
  //{{AFX_DATA(CAboutDlg) $E;Tj|W  
  enum { IDD = IDD_ABOUTBOX }; (4q/LuP^d  
  //}}AFX_DATA lZIJ[.  
  // ClassWizard generated virtual function overrides :F[s  
  //{{AFX_VIRTUAL(CAboutDlg) jp4-w(  
 protected: Z 369<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +]wM$bP  
  //}}AFX_VIRTUAL ` wj'  
  // Implementation (#85<|z  
 protected: byt$Wqdl  
  //{{AFX_MSG(CAboutDlg) 3 .j/D^  
  //}}AFX_MSG +CSv@ />3  
  DECLARE_MESSAGE_MAP() ?9eiT:2  
}; ~bzac2Rp  
)@Y< <9'2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /G]/zlUE  
{ =5^1Bl  
 //{{AFX_DATA_INIT(CAboutDlg) 4|Y1W}!0/  
 //}}AFX_DATA_INIT {!? M!/d  
} }|8^+V&  
8[AU`F8W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @aFk|.6  
{ 8n2;47 a  
 CDialog::DoDataExchange(pDX); {/5aF_0D.  
 //{{AFX_DATA_MAP(CAboutDlg) ra^%__N}  
 //}}AFX_DATA_MAP #k &#d9}  
} d5 {=<j  
y eIS}O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) O+< +yQl  
 //{{AFX_MSG_MAP(CAboutDlg) %c]N-  
 // No message handlers uxKO"  
 //}}AFX_MSG_MAP :?ZrD,D  
END_MESSAGE_MAP() ?+Vi !eS  
If&y 5C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )OQ<H.X  
: CDialog(CCaptureDlg::IDD, pParent) }{,Wha5\n  
{ ;[P>  
 //{{AFX_DATA_INIT(CCaptureDlg) y.8nzlkE{  
  m_bControl = FALSE; 74 )G.!  
  m_bAlt = FALSE; b-<@3N.9]  
  m_bShift = FALSE; /f oI.S  
  m_Path = _T("c:\\"); Q;q{1M>  
  m_Number = _T("0 picture captured."); iY,oaC~?"N  
  nCount=0; g$Vr9MH  
  bRegistered=FALSE; v}AjW%rB  
  bTray=FALSE; P&[&Dj  
 //}}AFX_DATA_INIT c 8Q2H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 XMP4YWuVc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~@@$-,}X   
} o F_{oV '  
- 3PLP$P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -jrAk  
{ : #n>Q1}x  
 CDialog::DoDataExchange(pDX); 0SIUp/.  
 //{{AFX_DATA_MAP(CCaptureDlg) G[_Z|Xi1  
  DDX_Control(pDX, IDC_KEY, m_Key); } C/+zF6q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #v~dhx=R  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >X:!Y[N  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -h ^MX  
  DDX_Text(pDX, IDC_PATH, m_Path); e$Yvy>I'tS  
  DDX_Text(pDX, IDC_NUMBER, m_Number); H{9P=l  
 //}}AFX_DATA_MAP Z1$U[Tsd  
} o.zP1n|G~r  
%{^|Av1Uz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) qJonzFp7  
//{{AFX_MSG_MAP(CCaptureDlg) d, ?GW  
 ON_WM_SYSCOMMAND() f TK84v"7_  
 ON_WM_PAINT() 8*B+@`  
 ON_WM_QUERYDRAGICON() $II ~tO  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) BKE?o^03  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >/}p{Tj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1#+|RL4o  
//}}AFX_MSG_MAP B *6 ncj  
END_MESSAGE_MAP() (@^ySiU  
H~Uy/22aQy  
BOOL CCaptureDlg::OnInitDialog() BjTgZ98J  
{ !SnLvW89Z  
 CDialog::OnInitDialog(); T9kc(i'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9Nv?j=*$  
 ASSERT(IDM_ABOUTBOX < 0xF000); v7#|%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); bd27])n(  
 if (pSysMenu != NULL) RDy&i  
 { +NvpYz  
  CString strAboutMenu; |:2B)X  
  strAboutMenu.LoadString(IDS_ABOUTBOX); q*a~9.i @  
  if (!strAboutMenu.IsEmpty()) GGhk`z  
  { *0V'rH)  
   pSysMenu->AppendMenu(MF_SEPARATOR); 61gyx6v  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v Lq%k+D#  
  } ! jDopE0L  
 } -rgdKA@)(  
 SetIcon(m_hIcon, TRUE); // Set big icon ,PJC FQMR  
 SetIcon(m_hIcon, FALSE); // Set small icon ouFKqRs;  
 m_Key.SetCurSel(0); 9~a5R]x2  
 RegisterHotkey(); T VSCjI  
 CMenu* pMenu=GetSystemMenu(FALSE); `2x.-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oaILh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /PR 4ILed  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?(Plb&kR  
 return TRUE; // return TRUE unless you set the focus to a control VUHf-bKl  
} .J+F H G'  
gLZJQubz 6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) utC^wA5U~  
{ cg9}T[A  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) b9-3  
 { @B(E&  
  CAboutDlg dlgAbout; CW/L(RQ  
  dlgAbout.DoModal(); L8 NZU*"  
 } `cN8AcRHP  
 else BTG_c_ ?]e  
 { `GCK%evLG  
  CDialog::OnSysCommand(nID, lParam); ocUBSK|K)  
 } Z d@B6R  
} ]Ge>S?u  
tw\1&*:  
void CCaptureDlg::OnPaint() %,ScGQE  
{ `Gl[e4U  
 if (IsIconic()) pm:-E(3#  
 { _RZ"WA^[  
  CPaintDC dc(this); // device context for painting a+a6P5kJ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); # kNp);  
  // Center icon in client rectangle @qx$b~%  
  int cxIcon = GetSystemMetrics(SM_CXICON); 87!m l  
  int cyIcon = GetSystemMetrics(SM_CYICON); =9 ^}>u  
  CRect rect; R1<$VR  
  GetClientRect(&rect); A2A_F|f  
  int x = (rect.Width() - cxIcon + 1) / 2; 1cRF0MI  
  int y = (rect.Height() - cyIcon + 1) / 2; hH%fWB2(  
  // Draw the icon Q&?0 ^;r  
  dc.DrawIcon(x, y, m_hIcon); 8$ #z>  
 } RQ^ \|+_  
 else X{6a  
 { ZBN,%P!P0  
  CDialog::OnPaint(); /_Ku:?{  
 } {{gt>"D,  
} ({!H ()  
u!F\`Gfm_  
HCURSOR CCaptureDlg::OnQueryDragIcon() g)|vS>^~  
{ [/ertB  
 return (HCURSOR) m_hIcon; pQC|_T#u  
} v '^}zO  
wrXn|aV  
void CCaptureDlg::OnCancel() @v&s|X '  
{ Q&^\YgkCf  
 if(bTray) -"H0Qafm  
  DeleteIcon(); PDCb(5  
  CDialog::OnCancel(); .c__T {<)[  
} }Ya! [tX  
,IE.8h)H  
void CCaptureDlg::OnAbout() TqfL Sm|  
{ 8Djki]  
 CAboutDlg dlg;  {d0-.  
 dlg.DoModal(); d~h;|Bl[  
} u%I%4 gM  
DQ c\[Gq&  
void CCaptureDlg::OnBrowse() (~E-=+R[$&  
{ &rPAW V'v  
 CString str; *rHz/& ,  
 BROWSEINFO bi; >gM"*Laa?  
 char name[MAX_PATH]; #Er"i  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {~s\a2YH  
 bi.hwndOwner=GetSafeHwnd(); [/VpvQ'  
 bi.pszDisplayName=name; u GqeT#dP  
 bi.lpszTitle="Select folder"; u^CL }t*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %.l={B,i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `NEi/jB  
 if(idl==NULL) M5t.l (  
  return; k*\)z\f  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k)X\z@I'  
 str.ReleaseBuffer(); S7#dyAX8  
 m_Path=str; bX(/2_l  
 if(str.GetAt(str.GetLength()-1)!='\\') BGwD{6`U  
  m_Path+="\\"; [m 6+I9  
 UpdateData(FALSE); r)K5<[\r  
} 2k^rZ^^"  
$|3zsi2  
void CCaptureDlg::SaveBmp() op9vz[o#4  
{ .QwB7+V4  
 CDC dc; yG7H>LF?8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); i^ |G  
 CBitmap bm; 8e,F{>N  
 int Width=GetSystemMetrics(SM_CXSCREEN); Yh fQ pe  
 int Height=GetSystemMetrics(SM_CYSCREEN); i'"#{4I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @ F $}/  
 CDC tdc; 2/uZ2N |S  
 tdc.CreateCompatibleDC(&dc); 1EC;t1.7  
 CBitmap*pOld=tdc.SelectObject(&bm); NqNU:_}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @o^$/AE?  
 tdc.SelectObject(pOld); 8TP~=qU  
 BITMAP btm; -;&I S  
 bm.GetBitmap(&btm); SE6( 3f$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; .s!0S-RkC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M"/Jn[  
 BITMAPINFOHEADER bih; H^@Hco>|  
 bih.biBitCount=btm.bmBitsPixel; 4\*:Lc,-  
 bih.biClrImportant=0; B7|%N=S%/  
 bih.biClrUsed=0; oSkQ/5hg.  
 bih.biCompression=0; _od /)#  
 bih.biHeight=btm.bmHeight; x;E/  
 bih.biPlanes=1; H>;,r ,  
 bih.biSize=sizeof(BITMAPINFOHEADER); y"'p#j  
 bih.biSizeImage=size; Iz. h  
 bih.biWidth=btm.bmWidth; $;Iz7:#jN  
 bih.biXPelsPerMeter=0; y%61xA`#  
 bih.biYPelsPerMeter=0; 1r}i[5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I9>vm]  
 static int filecount=0; {f)aFGp  
 CString name; ZeU){CB  
 name.Format("pict%04d.bmp",filecount++); l5&5VC)  
 name=m_Path+name; vcp{Gf|^  
 BITMAPFILEHEADER bfh; ]sL.+.P  
 bfh.bfReserved1=bfh.bfReserved2=0; 3\ Mt+!1{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /Wjc\n$'  
 bfh.bfSize=54+size; @SiV3k  
 bfh.bfOffBits=54; <#nU 06 fN  
 CFile bf; }zsIp,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S Z/yijf  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); pV  u[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); KW[y+c u.#  
  bf.WriteHuge(lpData,size); #0uu19+}  
  bf.Close(); R%\3[  
  nCount++; 7vFmB  
 } Zy;jp*Q  
 GlobalFreePtr(lpData); CLVT5pj='  
 if(nCount==1) hZL!%sL7  
  m_Number.Format("%d picture captured.",nCount); W)/f5[L  
 else t,8?Tf+i  
  m_Number.Format("%d pictures captured.",nCount); f:&JKB)N  
  UpdateData(FALSE); eF.nNu  
} 1+N'cB!y  
7z1@XO<D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )$9w Kk\F  
{  ] ?D$n  
 if(pMsg -> message == WM_KEYDOWN) rA B=H*|6  
 { Y,Z$U| U  
  if(pMsg -> wParam == VK_ESCAPE) ^\Q,ACkZb  
   return TRUE; D})/2O p   
  if(pMsg -> wParam == VK_RETURN) |UWIV  
   return TRUE; R=E4Sh  
 } %M'`K  
 return CDialog::PreTranslateMessage(pMsg); o4EY2  
} ;w"h n*  
3!gz^[!?EN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,e;,+w=~E  
{ *~U.36  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ua 6O~,\  
  SaveBmp(); #iv4L  
  return FALSE; U2<q dknB  
} @YH>|{S&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NcF>}f,}\  
 CMenu pop; $fD%18  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \:1$E[3v  
 CMenu*pMenu=pop.GetSubMenu(0); `Kf@<=  
 pMenu->SetDefaultItem(ID_EXITICON); $poIWJMc  
 CPoint pt; TsoxS/MI"  
 GetCursorPos(&pt); wdBB x\FP  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ew PJ|Z^  
 if(id==ID_EXITICON) <5pNFj}0;X  
  DeleteIcon(); >h#juO"  
 else if(id==ID_EXIT) yLfyLyO L  
  OnCancel(); f['lY1#V1  
 return FALSE; 8\' tfHL  
} ^ [m-PS(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); E2w-b^,5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u;rmqo1  
 AddIcon(); UsU Ri  
 return res; !w%c= V]tV  
} :M{ )&{D  
R0*P,~L;|  
void CCaptureDlg::AddIcon() t!/~_}eDJ  
{ S>(xx"Ia  
 NOTIFYICONDATA data; ">1wPq&  
 data.cbSize=sizeof(NOTIFYICONDATA); K3 BWj33  
 CString tip; 0R\.G1f%  
 tip.LoadString(IDS_ICONTIP); e#h&Xa  
 data.hIcon=GetIcon(0); %u&Vt"6m=  
 data.hWnd=GetSafeHwnd(); &(, &mE  
 strcpy(data.szTip,tip); 2D"my]FnF  
 data.uCallbackMessage=IDM_SHELL; f~P YK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eF{uWus  
 data.uID=98; 5p!{#r6m  
 Shell_NotifyIcon(NIM_ADD,&data); >m1b/J3#  
 ShowWindow(SW_HIDE); oz{X"jfu  
 bTray=TRUE; ~Uv#)  
} pn(i18 x  
c)^A|{,G  
void CCaptureDlg::DeleteIcon() ?87\_wL/j  
{ R-Lpgi<a"  
 NOTIFYICONDATA data; 13v`rK`7o  
 data.cbSize=sizeof(NOTIFYICONDATA); Y]`=cR`/"  
 data.hWnd=GetSafeHwnd(); D60quEe3%  
 data.uID=98; L{>rN`{  
 Shell_NotifyIcon(NIM_DELETE,&data); =#9#unvE!  
 ShowWindow(SW_SHOW); yY UAH-  
 SetForegroundWindow(); -th.(eAx  
 ShowWindow(SW_SHOWNORMAL); ti9e(Jt!O  
 bTray=FALSE; O ] !tK  
} Jf7H;ZM<  
LXby(|< j  
void CCaptureDlg::OnChange() CT|0KB&  
{ ZR3,dW6S  
 RegisterHotkey(); 6<S-o|Xw  
} <BBzv-?D  
Wq}6RdY$ZA  
BOOL CCaptureDlg::RegisterHotkey() A#I&&qZ  
{ 'J &R=MD  
 UpdateData(); UYZC% $5x  
 UCHAR mask=0; m)<+?Bv y  
 UCHAR key=0; R#~l[S8u^  
 if(m_bControl) =*ErN  
  mask|=4; LNk :PD0m  
 if(m_bAlt) zB+e;x f|  
  mask|=2; |-{ Hy(9  
 if(m_bShift) u?SwGXi~8  
  mask|=1;  8(K:2  
  key=Key_Table[m_Key.GetCurSel()]; {e2ZW]  
 if(bRegistered){ `g1?Q4h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); xV14Y9  
  bRegistered=FALSE; x{w|Hy  
 } JiXE{(  
 cMask=mask; k^K76mB  
 cKey=key; ke W7pN?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ( EJ1g^|"  
 return bRegistered; _,K[kVn  
} >ZPu$=[W  
Kzq^f=p  
  四、小结 t d\gk  
PuZzl%i P3  
  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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