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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: XNU[\I  
  _=.f+1W  
  一、实现方法 TCd1JF0  
^BruRgc+  
  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: ~X/1%  
Z ?{;|Z5  
#pragma data_seg("shareddata") B0^0d*8t|@  
HHOOK hHook =NULL; //钩子句柄 B0KZdBRx}  
UINT nHookCount =0; //挂接的程序数目 7xOrG],E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wER>a (  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 JKkR963 O  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P*# H]Pv  
static int KeyCount =0; yBPaGZ{f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `.FvuwP  
#pragma data_seg() +##b}?S%  
&.Jp,Xt)  
  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。 dfDz/sD*  
x_JCH7-  
  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: L.[ H   
H-9%/e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Qn77ZpL:LJ  
cKey,UCHAR cMask) rmW,#  
{ ;-d }\f ,  
 BOOL bAdded=FALSE; ^+JpI*,  
 for(int index=0;index<MAX_KEY;index++){ }/yhwijg  
  if(hCallWnd[index]==0){ 1r?<1vh:z  
   hCallWnd[index]=hWnd; |8$x  
   HotKey[index]=cKey; \S)\~>.`y!  
   HotKeyMask[index]=cMask; NY'sZTM&  
   bAdded=TRUE; (o1*7_]e  
   KeyCount++; >C`b 4xQ  
   break; 1A4!zqT;  
  } K.Tfu"6  
 } ;J~NfL  
 return bAdded; 1Z +3=$P  
} [=Y@Ul  
//删除热键 1}C|Javkn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k;w1y(  
{ `4RraJj>0~  
 BOOL bRemoved=FALSE; @N,EoSb :  
 for(int index=0;index<MAX_KEY;index++){ $#g1Mx{  
  if(hCallWnd[index]==hWnd){ b<de)MG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?q(7avS9  
    hCallWnd[index]=NULL; BpL,<r,  
    HotKey[index]=0; ,c@^u6a  
    HotKeyMask[index]=0; *v[WJ"8@  
    bRemoved=TRUE; y#:_K(A" k  
    KeyCount--; krPwFp2[*  
    break; )QGj\2I  
   } 4|uh&4"*@W  
  } 6uCa iPV  
 } k[]B P4  
 return bRemoved; %X Jv;|  
} L\Uf+d:&}G  
!F*7Mif_E  
y]B?{m``6  
  DLL中的钩子函数如下: 7u!i)<pn  
)z/+!y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) P {x`eD0  
{ GqXnOmk  
 BOOL bProcessed=FALSE; bsw0+UY=9  
 if(HC_ACTION==nCode) )\C:|  
 { oZxC.;xJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Ll%CeP  
   switch(wParam) 5Xu2MY=  
   {  EX%KfWDr  
    case VK_MENU: c(. 2D  
     MaskBits&=~ALTBIT; wRn]  
     break; \0iF <0oy  
    case VK_CONTROL: VLuhURI)  
     MaskBits&=~CTRLBIT; gnW `|-:\  
     break; <=A1d\   
    case VK_SHIFT: D9M<>Xz)  
     MaskBits&=~SHIFTBIT; #5xK&qA  
     break; Y]aVa2!Wb  
    default: //judge the key and send message MzRws f  
     break; D.zEE-cGyb  
   } Vv4 w?K  
   for(int index=0;index<MAX_KEY;index++){ ~ztsR;iL  
    if(hCallWnd[index]==NULL) =B g  
     continue; -t_t3aU|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bT<if@h-  
    { n}MW# :eJe  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *Ppb;   
     bProcessed=TRUE; eXY*l>B  
    } =m.Lw  
   } v /{LC4BF  
  } =T'N6x5@  
  else if((lParam&0xc000ffff)==1){ //有键按下 NGIbUH1[  
   switch(wParam) i>YD_#w  
   { fr$E'+l)  
    case VK_MENU: q~68)D(  
     MaskBits|=ALTBIT; CM+Nm(|\,  
     break; o(GXv3L  
    case VK_CONTROL: p]/HZS.-b  
     MaskBits|=CTRLBIT; 'M>QA"*48E  
     break; LeDty_  
    case VK_SHIFT: ezn%*X y,  
     MaskBits|=SHIFTBIT; ]z EatY  
     break; 1*\JqCR  
    default: //judge the key and send message p R=FH#  
     break; z^z_!@7v   
   } \ s^a4l 2  
   for(int index=0;index<MAX_KEY;index++){ xT7JGQ[|  
    if(hCallWnd[index]==NULL) P` Hxj> {  
     continue; #nV F.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gf'qPLK0  
    { jnfktDV'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Atc<xp  
     bProcessed=TRUE; ^'j? { @  
    } h.PVRAwk  
   } o! W 71  
  } ol QT r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6%bZZTP`  
   for(int index=0;index<MAX_KEY;index++){ lXH?*  
    if(hCallWnd[index]==NULL) e P]L  
     continue; #=mLQSiQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {"T$j V:GB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tHAr9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 HriY-=ji>a  
   } :.wR*E  
  } *->2$uWP  
 } bBwQ1,c$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '4-J0S<<_  
} `|maf=SnY5  
{;uOc{~+  
  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: a*?bnw?  
nBw4YDR!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _m.u@+g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DX>Yf}  
VfWU-lJ  
  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: /J''`Tf  
LpCJfQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KE>|,U r  
{ v_M-:e3`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) WzD=Ol  
 { 1iNq|~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Qh*"B  
  SaveBmp(); En01LrC?  
  return FALSE; MIa#\tJj  
 } {k BHZ$/  
 …… //其它处理及默认处理 j#:IG/)GL  
} 7A6Qrfw  
1dDK(RBbQ  
AA=zDB<N  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 !1G6ZC:z  
L@9@3?  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 =PU! hZj"L  
`sW+R=  
  二、编程步骤 zt&"K0X|  
yN-o?[o  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; X5[.X()M4  
%?<Y&t  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i7rO 5<  
p;#@#>h  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; \ @XvEx%  
4FwtC"G3  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; `Vph=`0  
h 8Shf"  
  5、 添加代码,编译运行程序。 g$X4ZRSel  
h{xq  
三、程序代码 8v{0=9,Z  
}Pi}? 41!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M N-j$-y}  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) iO$Z?Dyg9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9 5cIdF 6m  
#if _MSC_VER > 1000 c+dmA(JC  
#pragma once =:neGqd\_E  
#endif // _MSC_VER > 1000 >)`yG'[  
#ifndef __AFXWIN_H__ HNXMM  
#error include 'stdafx.h' before including this file for PCH LVHIQ9  
#endif 6gr?#D -F  
#include "resource.h" // main symbols b*5Yy/U  
class CHookApp : public CWinApp {>EM=ZZfg  
{ RaT.%:CRm  
 public: nDG41)|  
  CHookApp(); { $ a $m  
  // Overrides Qqm$Jl!  
  // ClassWizard generated virtual function overrides 9:\#GOg  
  //{{AFX_VIRTUAL(CHookApp) @wVq%GG}  
 public: P5?M"j0/^  
  virtual BOOL InitInstance(); qoZUX3{  
  virtual int ExitInstance(); $3yzB9\a"  
  //}}AFX_VIRTUAL %imI.6   
  //{{AFX_MSG(CHookApp) ve3-GWT{C  
  // NOTE - the ClassWizard will add and remove member functions here. tBB\^xq:  
  // DO NOT EDIT what you see in these blocks of generated code ! `8x.Mv  
  //}}AFX_MSG {OIktG2gZ  
  DECLARE_MESSAGE_MAP() {tKi8O^Rb  
}; rjaG{ i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OYYk[r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); au+6ookT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a ]b%v9  
BOOL InitHotkey(); "gIjU~'A  
BOOL UnInit(); A#;TY:D2  
#endif KkK !E  
Q[6<Y,}(pd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5~!&x@  
#include "stdafx.h" 7my7|s[  
#include "hook.h" ;o#wK>pk%M  
#include <windowsx.h> T[(4z@d`5  
#ifdef _DEBUG :qAF}|6  
#define new DEBUG_NEW S\jIs[Dz  
#undef THIS_FILE 9coN >y  
static char THIS_FILE[] = __FILE__; }57d3s  
#endif +$CO  
#define MAX_KEY 100 #Y_v0.N  
#define CTRLBIT 0x04 qA;!Pql`  
#define ALTBIT 0x02 y+aL5$x6  
#define SHIFTBIT 0x01 b<E0|VW  
#pragma data_seg("shareddata") 9JtPP  
HHOOK hHook =NULL; (~U1 X4  
UINT nHookCount =0; M[:},?ah0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [&MhAzF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hLo'q^mGr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .9uw@ Eq  
static int KeyCount =0; be+]kp  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {Gi:W/jJ  
#pragma data_seg() E|9'{3$  
HINSTANCE hins; w8KVs\/  
void VerifyWindow(); nW"ml$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sry`EkS  
//{{AFX_MSG_MAP(CHookApp) A< *G;  
// NOTE - the ClassWizard will add and remove mapping macros here. w~|z0;hC  
// DO NOT EDIT what you see in these blocks of generated code! *.P3fVlZ  
//}}AFX_MSG_MAP (X|`|Y  
END_MESSAGE_MAP() S(NUuu}S  
_/pdZM,V  
CHookApp::CHookApp() %YLyh?J  
{ u.!<)VIJx  
 // TODO: add construction code here, 8]2j*e0xV  
 // Place all significant initialization in InitInstance ^`f( Pg!  
} d@QC[$qXj  
|]=s  
CHookApp theApp; ,\CG}-v@CN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ( L ]C  
{ }'c@E0"  
 BOOL bProcessed=FALSE; z@tIC^s  
 if(HC_ACTION==nCode) y&(R1Y75  
 { ,/1[(^e  
  if((lParam&0xc0000000)==0xc0000000){// Key up iosL&*'8  
   switch(wParam) :G/.h[\R|  
   { Op 0Qpn  
    case VK_MENU: W^T6^q5;H  
     MaskBits&=~ALTBIT; Hphfqdh0`  
     break; Ks/Uyu. X  
    case VK_CONTROL: G ]JWd  
     MaskBits&=~CTRLBIT; IA(+}V  
     break; A1kqWhg\  
    case VK_SHIFT: l ]CnLqf&  
     MaskBits&=~SHIFTBIT; jHx)q|2\  
     break; ?S0gazZm  
    default: //judge the key and send message y^tp^  
     break; 5#}wI~U;  
   } $?Yw{%W  
   for(int index=0;index<MAX_KEY;index++){ A6AIkKjzq  
    if(hCallWnd[index]==NULL) ffibS0aM  
     continue; u EE#A0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yq,% ey8  
    { )u}MyFl.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !vwx0  
     bProcessed=TRUE; >G<.^~o  
    } ,].S~6IM  
   } RXWS,rF  
  } oP`yBX  
  else if((lParam&0xc000ffff)==1){ //Key down 38HnW  
   switch(wParam) 6JZ$; x{j  
   { 6~y7A<[^  
    case VK_MENU: w@Gk#  
     MaskBits|=ALTBIT; :d`8:gv?  
     break; 6H:'_|G  
    case VK_CONTROL: Xw<5VIAHm;  
     MaskBits|=CTRLBIT; bR&<vrMmrA  
     break; FK!UUy;  
    case VK_SHIFT: )WR*8659e  
     MaskBits|=SHIFTBIT; {WYmO1  
     break; *JmU",X  
    default: //judge the key and send message <Q%:c4N  
     break; ?[~)D}] j  
   } x}*Y =Xh  
   for(int index=0;index<MAX_KEY;index++) vo3[)BDbT  
   { -7\6j#;l  
    if(hCallWnd[index]==NULL) ypA)G/;  
     continue; (g 9G!I   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /&Vgo ~.J  
    { a"|\n_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u*C"d1v=  
     bProcessed=TRUE; `<x|< ey  
    } VjhwafYC  
   } *d/,Y-tl  
  } |= U(8t  
  if(!bProcessed){ 8~s-@3J  
   for(int index=0;index<MAX_KEY;index++){ AcCM W@e  
    if(hCallWnd[index]==NULL) `h+1u`FJ  
     continue; u, Rhm-`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vo-]&u&cr  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4}t&AW4  
   } x|oa"l^JZ"  
  } 2`]_c=  
 } Qx%]u8s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W;9Jah.  
} %G>|u/:U  
k3FpD=N  
BOOL InitHotkey() 0-{l4;o  
{ G*$a81dAX  
 if(hHook!=NULL){ !&=%#i  
  nHookCount++; D8I)3cXa'  
  return TRUE; zcTY"w\b  
 } {Q@pF  
 else <(<19t5.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B%e#u.'6  
  if(hHook!=NULL) %M_5C4&6  
   nHookCount++; <0hJo=6a8  
  return (hHook!=NULL); uY5Gn.Y  
} ;n-IpR#|  
BOOL UnInit() /^>yDG T,0  
{ N;BS;W5I  
 if(nHookCount>1){ J@I-tS  
  nHookCount--; mK2M1r  
  return TRUE; [Y^1}E*  
 } <fLk\ =  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I$7TnMug  
 if(unhooked==TRUE){ !Ho=(6V  
  nHookCount=0; D;l)&"|r?  
  hHook=NULL; Q(e3-a  
 } 0Q_@2  
 return unhooked; yt-F2Z&  
} wc ! v /A  
ErDt~FH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )5M9Ro7  
{ /`Wd+  
 BOOL bAdded=FALSE; 9ywPWT[^  
 for(int index=0;index<MAX_KEY;index++){ .+"SDt oX  
  if(hCallWnd[index]==0){ T'TxC)  
   hCallWnd[index]=hWnd; s`$px2Gw  
   HotKey[index]=cKey; -}?ud3f<  
   HotKeyMask[index]=cMask; tt7l%olw  
   bAdded=TRUE; 4gNF;  
   KeyCount++; Cq0S8Or0  
   break; \I4*|6kA  
  } ;_^ "}  
 } (n~ e2tZ/  
 return bAdded; 7 i |_PP_  
} L,F )l2  
G*f5B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2 #+g4  
{ ?+bDFM}  
 BOOL bRemoved=FALSE; [-bT_X  
 for(int index=0;index<MAX_KEY;index++){ vKX $Nf  
  if(hCallWnd[index]==hWnd){ wPl!}HNf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Qs*6wF  
    hCallWnd[index]=NULL; M!s@w%0?'  
    HotKey[index]=0; \q8D7/q  
    HotKeyMask[index]=0; =lf&mD _/  
    bRemoved=TRUE; >Tm|}\qEb  
    KeyCount--; zJfoU*G/B  
    break; TZ7{cekQ  
   } h4GR:`  
  } 2Q,8@2w;  
 } :K3nJ1G&  
 return bRemoved; c9dH ^t  
} ~la=rh3  
Q1Jkt  
void VerifyWindow() :q2tda  
{ cJ%u&2J_  
 for(int i=0;i<MAX_KEY;i++){ gJy Ft8Z<  
  if(hCallWnd!=NULL){ QPH2TXw  
   if(!IsWindow(hCallWnd)){ 042sjt  
    hCallWnd=NULL; =9 TAs? =  
    HotKey=0; *yv@-lP5s  
    HotKeyMask=0; ]x hmM1$  
    KeyCount--; 2wWL]`(E  
   } z:aT5D  
  } COw]1 R  
 } 9 GdrJ~h  
} S!GjCog^J  
'U)|m  
BOOL CHookApp::InitInstance() #pxc6W /  
{ @5%cP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !P, 9Sg&5)  
 hins=AfxGetInstanceHandle(); <:u)C;  
 InitHotkey(); H7e/6t<x  
 return CWinApp::InitInstance(); fuQ|[tpvQG  
} Musz+<]  
]u_^~  
int CHookApp::ExitInstance() `F>1xMm  
{ n ?%3=~9  
 VerifyWindow(); #N|)hBz9-  
 UnInit(); JlF0L%Rc  
 return CWinApp::ExitInstance(); %<e\s6|P:  
} HRx%m1H  
BEM+FG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'nNw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) : 5@cj j  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %>uGzQ61  
#if _MSC_VER > 1000 j\nnx8`7  
#pragma once RGGP6SDc  
#endif // _MSC_VER > 1000 &50Kn[  
)S$!36Ni[  
class CCaptureDlg : public CDialog E0c5c  
{ }TRr*] P<%  
 // Construction fV3!x,H  
 public: AAsl )  
  BOOL bTray; P,!k^J3:l  
  BOOL bRegistered; >R?EJ;h  
  BOOL RegisterHotkey(); 181-m7W  
  UCHAR cKey; {Gs&u>>R"^  
  UCHAR cMask; 4yC{BRbi  
  void DeleteIcon(); VG'oy  
  void AddIcon(); /D_8uTS>d[  
  UINT nCount; 0.nS306  
  void SaveBmp(); q+32|k>)  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~Xnq(}?ok  
  // Dialog Data dCcV$BX,K  
  //{{AFX_DATA(CCaptureDlg) P _t8=d  
  enum { IDD = IDD_CAPTURE_DIALOG }; o><~.T=d&  
  CComboBox m_Key; _c%]RE  
  BOOL m_bControl;  UJoWTx  
  BOOL m_bAlt; c?d+>5"VX  
  BOOL m_bShift; 4i[3|hv'  
  CString m_Path; +I2P{7  
  CString m_Number; pM\)f  
  //}}AFX_DATA B4&@PX"'>,  
  // ClassWizard generated virtual function overrides r{kV*^\E  
  //{{AFX_VIRTUAL(CCaptureDlg) tqrvcnQr^  
 public: =[`wyQe`_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U;KHF{Vm  
 protected: j2#Vdw|j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qo.~5   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6(oGU4  
  //}}AFX_VIRTUAL h GS";g[?  
  // Implementation KbH#g>.oB  
 protected: ?4q6>ipx  
  HICON m_hIcon; ls,gQ]B:P  
  // Generated message map functions ]xf{.z  
  //{{AFX_MSG(CCaptureDlg) 7%8,*T  
  virtual BOOL OnInitDialog(); `R8~H7{I6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (H+'sf^h  
  afx_msg void OnPaint(); Lq LciD  
  afx_msg HCURSOR OnQueryDragIcon(); m |,ocz  
  virtual void OnCancel(); I~"-  
  afx_msg void OnAbout(); 6%ID*  
  afx_msg void OnBrowse(); pZGs o  
  afx_msg void OnChange(); 8pDJz_F!{  
 //}}AFX_MSG 8dUwJ"<5  
 DECLARE_MESSAGE_MAP() |MMr}]`  
}; lyZof_/*  
#endif guSgTUJ}  
F f& VBm  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +zs;>'Sf  
#include "stdafx.h" \I,<G7!0  
#include "Capture.h" 7=T0Sa*;  
#include "CaptureDlg.h" J~<:yBup}  
#include <windowsx.h> d&?B/E^  
#pragma comment(lib,"hook.lib") 43:~kCF[s  
#ifdef _DEBUG Li Qs;$V  
#define new DEBUG_NEW OU9=O>  
#undef THIS_FILE J;"XRE[%5  
static char THIS_FILE[] = __FILE__; =q[3/'2V$?  
#endif o|alL-  
#define IDM_SHELL WM_USER+1 ":"M/v%F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <2H 0m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {(7. X4\x  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |}q0 G~l  
class CAboutDlg : public CDialog o,Ha-z]f  
{ Q6%m}R  
 public: 0<v~J9i  
  CAboutDlg(); C)#:zv m  
  // Dialog Data FAE>N-brQ  
  //{{AFX_DATA(CAboutDlg) 1 ,D2][  
  enum { IDD = IDD_ABOUTBOX }; C _[jQTr  
  //}}AFX_DATA A7|"0*62  
  // ClassWizard generated virtual function overrides 1oX"}YY1  
  //{{AFX_VIRTUAL(CAboutDlg) }(M<sEK~  
 protected: yo (&~r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '` [nt25N  
  //}}AFX_VIRTUAL 2[M:WZ.1  
  // Implementation X dB#+"[  
 protected: yg\A&0I  
  //{{AFX_MSG(CAboutDlg) /B1< N}  
  //}}AFX_MSG ~ xf9 ml  
  DECLARE_MESSAGE_MAP() >t*zY~R.  
}; {b/AOR o  
i7fpl  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) w0*6GCP  
{ Mh_jlgE'd#  
 //{{AFX_DATA_INIT(CAboutDlg) ` GPK$ue  
 //}}AFX_DATA_INIT tvb hWYe  
} XkdNWR0  
} doj4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5>A3;P  
{ 31b-r[B{%  
 CDialog::DoDataExchange(pDX); 1Kc* MS  
 //{{AFX_DATA_MAP(CAboutDlg) UBC[5E$  
 //}}AFX_DATA_MAP `+zr PpX  
} -h.YQC`  
3tLh{S?uJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) B r pin  
 //{{AFX_MSG_MAP(CAboutDlg) Vx0V6{JX  
 // No message handlers j/Bzbjq"  
 //}}AFX_MSG_MAP 2_F`ILCML  
END_MESSAGE_MAP() 8sbS7*#  
OH)SdSBz  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zNXk dw  
: CDialog(CCaptureDlg::IDD, pParent) ) Fm  
{ 8u+ (+25  
 //{{AFX_DATA_INIT(CCaptureDlg) Rf%ver  
  m_bControl = FALSE; ~^5uOeTZ~  
  m_bAlt = FALSE; o9eK7*D  
  m_bShift = FALSE; /VJ@`]jhDf  
  m_Path = _T("c:\\"); k8*=1kl"  
  m_Number = _T("0 picture captured."); qx!IlO  
  nCount=0; }%XNB1/`  
  bRegistered=FALSE; y|lP.N/  
  bTray=FALSE; {O^1WgGc[  
 //}}AFX_DATA_INIT +ZZiZ&y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KR522YW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^WD [>E~  
} Y":hb;&  
uP* >-s'm  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |x kixf4zz  
{  UNhD  
 CDialog::DoDataExchange(pDX); G3OQbqn  
 //{{AFX_DATA_MAP(CCaptureDlg) bpU^|r^W  
  DDX_Control(pDX, IDC_KEY, m_Key); i&bttSRNV  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); , 1`eH[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W&p-Z"=)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); U 9 k}y  
  DDX_Text(pDX, IDC_PATH, m_Path); q&W#nWBV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); % vP{C  
 //}}AFX_DATA_MAP W%$p,^@S5  
} -u9{R\S  
.g|pgFM?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (PB|.`_<H  
//{{AFX_MSG_MAP(CCaptureDlg) [Q$"+@jw  
 ON_WM_SYSCOMMAND() <Jvr mm[  
 ON_WM_PAINT() ER|5_  
 ON_WM_QUERYDRAGICON() iL\\JuY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j1d=$'a "  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v~xG*e  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +V7p?iEY  
//}}AFX_MSG_MAP HL!-4kN <$  
END_MESSAGE_MAP() 2KzKNe(  
\Lc]6?,R  
BOOL CCaptureDlg::OnInitDialog() kO9yei  
{ k&?QeXW  
 CDialog::OnInitDialog(); T-x`ut7c  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $zbg  
 ASSERT(IDM_ABOUTBOX < 0xF000); oC?b]tzj  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Df4n9m}E  
 if (pSysMenu != NULL) :@3d  
 { v EX <9  
  CString strAboutMenu; vLC&C-f  
  strAboutMenu.LoadString(IDS_ABOUTBOX); # K-Q/*  
  if (!strAboutMenu.IsEmpty()) 9wwvh'T&NK  
  { JBg>E3*N  
   pSysMenu->AppendMenu(MF_SEPARATOR); '1{~y3  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); C1nQZtF R  
  } Vw#07P#A  
 } #&/*ll)  
 SetIcon(m_hIcon, TRUE); // Set big icon 8<G@s`*  
 SetIcon(m_hIcon, FALSE); // Set small icon VEn%_9(]  
 m_Key.SetCurSel(0); nDo|^{!L`  
 RegisterHotkey(); un/R7 "  
 CMenu* pMenu=GetSystemMenu(FALSE); Z*Y?"1ar  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Q2 edS|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ga h e-%J  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  OkQSqL  
 return TRUE; // return TRUE unless you set the focus to a control aL`pvsnF  
} {P3,jY^  
] x Kmz  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rm cy-}e  
{ PNG'"7O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [|>.iH X  
 { w_ Ls.K5"  
  CAboutDlg dlgAbout;  {jl4`  
  dlgAbout.DoModal(); m$ JQ[vgh  
 } V&>7i9lEz  
 else WGO=@jkf  
 { ~9n@MPS^!  
  CDialog::OnSysCommand(nID, lParam); ^ 1g6(k'  
 } YnMph0\Y^  
} B}jZ~/D}  
8R z=)J  
void CCaptureDlg::OnPaint() [sad}@R7  
{ h>n;A>k@N  
 if (IsIconic()) -R8RAwsLG  
 { QO k%Q$^G  
  CPaintDC dc(this); // device context for painting ooq>/OI0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UO&S6M]v7  
  // Center icon in client rectangle 99eS@}RC  
  int cxIcon = GetSystemMetrics(SM_CXICON); %_u3Np  
  int cyIcon = GetSystemMetrics(SM_CYICON); g7H;d  
  CRect rect; 4*54"[9Hr#  
  GetClientRect(&rect); <E ^:{J95  
  int x = (rect.Width() - cxIcon + 1) / 2; @fY!@xSf  
  int y = (rect.Height() - cyIcon + 1) / 2; QL)UPf>Kp  
  // Draw the icon Wm A:"!~M  
  dc.DrawIcon(x, y, m_hIcon); z#\Z|OKU  
 } L.GpQJ8u  
 else 6 Ym[^U  
 { *<UQ/)\  
  CDialog::OnPaint(); ,Bta)  
 } NBeGmC|  
} YcGqT2oLP  
"L ,FUo^&  
HCURSOR CCaptureDlg::OnQueryDragIcon() e"b F"L  
{ `KL`^UqR  
 return (HCURSOR) m_hIcon; b+C>p2%  
} =DtM.oQ>  
p7k0pSt  
void CCaptureDlg::OnCancel() +<iw|vr  
{ ;6]+/e7O  
 if(bTray) qvt~wJf<  
  DeleteIcon(); n8iN/Y<%U  
  CDialog::OnCancel(); 9+/<[w7  
} X+*| nvq]  
mr/^lnO  
void CCaptureDlg::OnAbout() ,wq.C6;&  
{ tVe*J@i\$  
 CAboutDlg dlg; Og,,s{\  
 dlg.DoModal(); KavRW.w  
} 0]WM:6 h  
[<%yUy  
void CCaptureDlg::OnBrowse() Bf7RW[ -v  
{ l"MEX/   
 CString str; MTF:mLJ  
 BROWSEINFO bi; pa+ y(!G  
 char name[MAX_PATH]; $EtZ5?qS  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :n>h[{ o%  
 bi.hwndOwner=GetSafeHwnd(); PGybX:L  
 bi.pszDisplayName=name; +/Z:L$C6  
 bi.lpszTitle="Select folder"; #v`G4d  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ")LF;e  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); VRxBi!d  
 if(idl==NULL) {o]OxqE@  
  return; 2{ptV\f]D  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); SKYS6b  
 str.ReleaseBuffer(); } HvVL}7  
 m_Path=str; ^&,{  
 if(str.GetAt(str.GetLength()-1)!='\\') Bz24U wcZ  
  m_Path+="\\"; 7{b|+0W  
 UpdateData(FALSE); S>'wb{jj!  
} %;zA_Wg  
-m__I U  
void CCaptureDlg::SaveBmp() T? =jKLPC  
{ pZWp2hj{X  
 CDC dc; ;z[yNW8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3FS:]|oC  
 CBitmap bm; #4|?;C)u\  
 int Width=GetSystemMetrics(SM_CXSCREEN); 'Oq}BVR&  
 int Height=GetSystemMetrics(SM_CYSCREEN); l,d8% \  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fCTjTlh  
 CDC tdc; ?n_Y _)9  
 tdc.CreateCompatibleDC(&dc); Oo#wPT;1^(  
 CBitmap*pOld=tdc.SelectObject(&bm); 8HWY]:| oh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "#p)Z{v"!  
 tdc.SelectObject(pOld); EKDv3aFQZ#  
 BITMAP btm; _o`'b80;  
 bm.GetBitmap(&btm); )\s:.<?EQ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K7y}R%Q F  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5:AAqMa  
 BITMAPINFOHEADER bih; nhy3E  
 bih.biBitCount=btm.bmBitsPixel; ?C4a,%  
 bih.biClrImportant=0; 9,F(f}(t  
 bih.biClrUsed=0; yCQpqh  
 bih.biCompression=0; N-5lILuJJ  
 bih.biHeight=btm.bmHeight; Pl 5+Oo  
 bih.biPlanes=1; m6JIq}CMb  
 bih.biSize=sizeof(BITMAPINFOHEADER); 45_zO#  
 bih.biSizeImage=size; {wd.aUB  
 bih.biWidth=btm.bmWidth; ukZL  
 bih.biXPelsPerMeter=0; D@f%&|IZ  
 bih.biYPelsPerMeter=0; 4S9AXE6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jIEK[vJ`  
 static int filecount=0; {9)LHX7dN  
 CString name; T$k) ^'  
 name.Format("pict%04d.bmp",filecount++); wCkkfTO  
 name=m_Path+name; z[7U>q[E  
 BITMAPFILEHEADER bfh; fEM8/bhq  
 bfh.bfReserved1=bfh.bfReserved2=0; kH{axMNc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2o{Fp7l  
 bfh.bfSize=54+size; }-Zfl jj  
 bfh.bfOffBits=54; ?SS?I  
 CFile bf; Vg2s~ce{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X3q'x}{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); gBrIqM i5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `< VoZ/v  
  bf.WriteHuge(lpData,size); B_:K.]DK`  
  bf.Close(); BPC$ v\a  
  nCount++; {U&Mo97rzX  
 } :e gSW2"5S  
 GlobalFreePtr(lpData); F-2HE><+  
 if(nCount==1) 3"q%-M|+Q  
  m_Number.Format("%d picture captured.",nCount); zQ7SiRt7*  
 else :vc[ iZ  
  m_Number.Format("%d pictures captured.",nCount); B<_T"n'#b  
  UpdateData(FALSE); /X8b=:h  
} qk<tLvD_'  
sHAzg^n}r  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d<!bE(  
{ >)!"XFbb  
 if(pMsg -> message == WM_KEYDOWN) 1{"e'[ L  
 { =TyN"0@  
  if(pMsg -> wParam == VK_ESCAPE) As78yfK  
   return TRUE; ~Ge-7^Fo7  
  if(pMsg -> wParam == VK_RETURN) vsLn@k3  
   return TRUE; #B>Hq~ vrC  
 } {iHC;a5gb$  
 return CDialog::PreTranslateMessage(pMsg); Pbz-I3+66  
} ,TP^i 0  
@{~x:P5g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q"fK"H-j  
{ !+CRS9\D   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )|\72Z~eq  
  SaveBmp(); Z@j0J[s  
  return FALSE; 9e.n1  
} A2F+$N  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (\M&/X~q  
 CMenu pop; :m-HHWMN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6ffrV  
 CMenu*pMenu=pop.GetSubMenu(0); 2Xgn[oI{  
 pMenu->SetDefaultItem(ID_EXITICON); 5a-8/.}cP  
 CPoint pt; /ptIxe  
 GetCursorPos(&pt); i7*4hYY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^D/*Hp _  
 if(id==ID_EXITICON) 5GC{)#4  
  DeleteIcon(); +5 @8't  
 else if(id==ID_EXIT) <A+Yo3|7  
  OnCancel(); @l BR;B"  
 return FALSE; ~9 K4]5K-  
} O{LWQ"@y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H@'Y>^z?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) M="%NxuS  
 AddIcon(); c5^i5de  
 return res; T4._S:~  
} BL,YJM(y  
[+>$'Du  
void CCaptureDlg::AddIcon() v ;{s@CM m  
{ oZP:}= F  
 NOTIFYICONDATA data; HL*jRl  
 data.cbSize=sizeof(NOTIFYICONDATA); R6CxNPRJ  
 CString tip; JF!!)6!2#  
 tip.LoadString(IDS_ICONTIP);  8tLkJOu  
 data.hIcon=GetIcon(0); !!dNp5h`  
 data.hWnd=GetSafeHwnd(); LV'v7 2yUH  
 strcpy(data.szTip,tip); Ij/c@#q.  
 data.uCallbackMessage=IDM_SHELL; P}JA"V&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \)`\F$CF  
 data.uID=98; 42 8kC,  
 Shell_NotifyIcon(NIM_ADD,&data); =<R77rnY&  
 ShowWindow(SW_HIDE); V=.lpj9m  
 bTray=TRUE; aCy2 .Qn  
} =as]>?<  
rVFAwbR  
void CCaptureDlg::DeleteIcon() N!r@M."  
{ xlS t  
 NOTIFYICONDATA data; ~ia#=|1}  
 data.cbSize=sizeof(NOTIFYICONDATA); 980[]&(  
 data.hWnd=GetSafeHwnd(); $UO7AHk  
 data.uID=98; - C8 h$P  
 Shell_NotifyIcon(NIM_DELETE,&data); v"=^?5B  
 ShowWindow(SW_SHOW); lbTz  
 SetForegroundWindow(); q'd6\G0 }  
 ShowWindow(SW_SHOWNORMAL); "k5 C?~  
 bTray=FALSE; ?OlYJ/!z3  
} ]D%D:>9|/  
<-X)<k  
void CCaptureDlg::OnChange() u!X[xe;  
{ ]%F3 xzOk  
 RegisterHotkey(); |OuZaCJG  
} qvhTc6oH  
Kl\A&O*{  
BOOL CCaptureDlg::RegisterHotkey() l% K9Ke  
{ i#&]{]}Qv  
 UpdateData(); vQYd!DSh  
 UCHAR mask=0; Xy=|qu  
 UCHAR key=0; rsy'ZVLUj  
 if(m_bControl) n"d~UV^Uw  
  mask|=4; >"N\ZC^  
 if(m_bAlt) 1&U'pp|T  
  mask|=2; Vad(PS0  
 if(m_bShift) jHTaG%oh  
  mask|=1; nEyP Nm )  
  key=Key_Table[m_Key.GetCurSel()]; Q/-YLf.  
 if(bRegistered){ ,Ix7Yg[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7H++ pOF  
  bRegistered=FALSE; Q->'e-\E<"  
 } ~\Fde^1  
 cMask=mask; b]Oc6zR,,~  
 cKey=key; }a-ikFQ]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I)O%D3wfMW  
 return bRegistered; )"=BbMfhu  
} r]" >  
(a@cK,  
  四、小结 U7bG(?k)  
el 5F>)  
  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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