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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: B]@25  
  DY9]$h*y  
  一、实现方法 OZ+v ~'oD  
t&:L?K)j  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: [:FiA?O]  
a&V;^ /  
#pragma data_seg("shareddata") DU0/if9.  
HHOOK hHook =NULL; //钩子句柄 fGO\f;P  
UINT nHookCount =0; //挂接的程序数目 ^lAM /  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4(|yl^w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 nYFrp)DLK  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3+15 yEeA  
static int KeyCount =0; ! 5NuFLOf  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >mai v;  
#pragma data_seg() :n QlS  
]"lB!O~  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 7jgj;%  
w4vV#C4X  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Rd&DH_<+^  
,/D}a3JD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Z*q9vX  
cKey,UCHAR cMask) gf1+yJ^d!  
{ Dlq !:dF{&  
 BOOL bAdded=FALSE; KWZhCS?[(  
 for(int index=0;index<MAX_KEY;index++){ #<S*MGp!=  
  if(hCallWnd[index]==0){ qh:Bc$S  
   hCallWnd[index]=hWnd; 2lCFE)  
   HotKey[index]=cKey; 3f] ;y<Km  
   HotKeyMask[index]=cMask; pK@=]K~l0  
   bAdded=TRUE; USEb} M`  
   KeyCount++; 0z8?6~M;<  
   break; Jsysk $R  
  } !R"W2Z4h  
 } \gk.[={^P  
 return bAdded; 8HQ.MXKP  
} TK fN`6  
//删除热键 *y!O\-\S#>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I5_HaC>  
{ /\c'kMAW!  
 BOOL bRemoved=FALSE; Z*i p=FYR  
 for(int index=0;index<MAX_KEY;index++){ P"8Ix  
  if(hCallWnd[index]==hWnd){ jYFJk&c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [/CGV8+  
    hCallWnd[index]=NULL; a:fP  
    HotKey[index]=0; b,E?{uG  
    HotKeyMask[index]=0; D&" D[|@  
    bRemoved=TRUE; m{/( 3  
    KeyCount--; %bAQ>E2;m  
    break; N-\N\uN  
   } :<t=??4m  
  } MLu!8dgI  
 } O\ZC$XF  
 return bRemoved; G aV&y  
} IWQ0I&tzdx  
k*\Bl4g  
wSN9`"  
  DLL中的钩子函数如下: m$fEk,d  
cm(*F 0<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C/!.VMl^  
{ YV<y-,Io  
 BOOL bProcessed=FALSE; ,Uz8_r  
 if(HC_ACTION==nCode) ]>t~Bcn m  
 { LE\=Y;%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ->8Kd1^F  
   switch(wParam) "XR=P> xk  
   {  wlT8|  
    case VK_MENU: STp9Gh-  
     MaskBits&=~ALTBIT; RpQeQM=  
     break; vR!+ 8sy$  
    case VK_CONTROL: QQM:[1;RT  
     MaskBits&=~CTRLBIT; @- STo/  
     break; H648[H[k  
    case VK_SHIFT: d:@+dS  
     MaskBits&=~SHIFTBIT; <+_XGOt0<  
     break; >R+-mP!nj  
    default: //judge the key and send message D\acA?d`  
     break; {^WK#$]  
   } RdYmh>c  
   for(int index=0;index<MAX_KEY;index++){ EtKq.<SJ  
    if(hCallWnd[index]==NULL) +/~]fI  
     continue; 2R[v*i^S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /jG?PZ=m  
    { }a7d(7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mn7I# ~  
     bProcessed=TRUE; J~m$7T3Af  
    } b/M/)o!C  
   } r5}p .  
  } um.ZAS_kmc  
  else if((lParam&0xc000ffff)==1){ //有键按下 D&G6^ME  
   switch(wParam) .a.H aBBV  
   { rH3U;K!  
    case VK_MENU: P`biHs8O  
     MaskBits|=ALTBIT; *;fTiL  
     break; i#[8I-OtN/  
    case VK_CONTROL: g8<ODU0[g  
     MaskBits|=CTRLBIT; h>/teHy /  
     break; ?zW'Hi  
    case VK_SHIFT: A2|Bbqd  
     MaskBits|=SHIFTBIT; KD kGQh#9  
     break; V<QpC5  
    default: //judge the key and send message ~}.C*;J  
     break; x?Abk  
   } y, l[v39  
   for(int index=0;index<MAX_KEY;index++){ Kh]es,$D  
    if(hCallWnd[index]==NULL) @t%da^-HS"  
     continue; -9b=-K.y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;_,jy7lf  
    { 7Qd4L.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .]v>LsbhF  
     bProcessed=TRUE; dn(!wC]  
    } w2s`9  
   } WLUgiW(0$  
  } U% h.l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :zHSy&i`  
   for(int index=0;index<MAX_KEY;index++){ q"VmuQ  
    if(hCallWnd[index]==NULL) MhMiSsZ  
     continue; o?baiOkH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) . >"xp6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '12m4quO  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qs]W2{-4~  
   } y\FQt];z)  
  } u$\.aWol  
 } #{6VdWZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xWxHi6U(  
} *~PB  
mdc?~??8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 1)z'-dQ-5$  
f(Xin3#'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +~5Lo'^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o?a2wY^_  
{sw|bLo|+  
  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: 0~nX7  
S Qmn*CW  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {!I`EN]  
{ mI&3y9; (  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) rEa(1(I  
 { `wi+/^);  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1uo- ?k  
  SaveBmp(); -M{s zH  
  return FALSE; XRPJPwes]  
 } G#7*O`  
 …… //其它处理及默认处理 $O|Xq7dp  
} z 0?MeH#  
[J2evi?  
hC$e8t60  
  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。 Es[3Ppz  
`{#""I^_  
  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。 AF:_&gF  
3o rSk  
  二、编程步骤 Hcf"u&%  
z>!./z]p  
  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"; Y1 Ql_  
{MtJP:8Jp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r*{.|>me  
7{r7  
  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; k)+{Y v*  
}hn?4ny  
  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; #66i!}  
Ku'a,\7z  
  5、 添加代码,编译运行程序。 `Am|9LOT  
t ]BG)]  
三、程序代码 "smU5 s,P  
/ B!j`UK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \4 b^*`d  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?8753{wk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ %g?M?D8Ud3  
#if _MSC_VER > 1000 }oD^tU IK  
#pragma once 61_PSScSY  
#endif // _MSC_VER > 1000 6GuTd  
#ifndef __AFXWIN_H__ MgiW9@_(  
#error include 'stdafx.h' before including this file for PCH ^C K!=oO  
#endif |21V OPBS  
#include "resource.h" // main symbols DlzL(p@r  
class CHookApp : public CWinApp X}GX6qAdt  
{ pauO_'j_1p  
 public: zeGWM,!  
  CHookApp(); |K. I%B  
  // Overrides xjp0w7L)J  
  // ClassWizard generated virtual function overrides B}7j20:Z  
  //{{AFX_VIRTUAL(CHookApp) Ifp8oL?S;  
 public: Lum=5zDo  
  virtual BOOL InitInstance(); 1!zd#TX  
  virtual int ExitInstance(); EwBrOq`C  
  //}}AFX_VIRTUAL F*G]Na@6D  
  //{{AFX_MSG(CHookApp) :"y2u   
  // NOTE - the ClassWizard will add and remove member functions here. h7eb/xEto  
  // DO NOT EDIT what you see in these blocks of generated code ! RSAGSGp  
  //}}AFX_MSG +184|nJ<2  
  DECLARE_MESSAGE_MAP() /Igz[P^\9  
}; h8WM4 PK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); X!V#:2JY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <mJ8~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0=+feB1T  
BOOL InitHotkey(); z$ QoMq]  
BOOL UnInit(); &am<_Tn*3  
#endif P:Q&lnC  
dOaOWMrfdf  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2(uh7#Q  
#include "stdafx.h" y=Eb->a){  
#include "hook.h" |QZ E  
#include <windowsx.h> *QN,w BQ  
#ifdef _DEBUG XnYX@p  
#define new DEBUG_NEW <XrXs  
#undef THIS_FILE ?yG[VW  
static char THIS_FILE[] = __FILE__; a,fcKe&B  
#endif `j3 OFC{7E  
#define MAX_KEY 100 xm=Gt$>.o  
#define CTRLBIT 0x04 sw9ri}oc  
#define ALTBIT 0x02 6lpJ+A57#  
#define SHIFTBIT 0x01 n"?*"Ya  
#pragma data_seg("shareddata") ~|<'@B!6  
HHOOK hHook =NULL; B W)@.!C  
UINT nHookCount =0; X+{brvM<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey C6gp}%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  zv"NbN  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SWtqp(h]'  
static int KeyCount =0; C`ZU.|R  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OGW3Pe0Z'  
#pragma data_seg() aQHR=.S]X  
HINSTANCE hins; vMY!Z1.*  
void VerifyWindow(); CY=lN5!J  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g'!"klS93  
//{{AFX_MSG_MAP(CHookApp) N*[b 26  
// NOTE - the ClassWizard will add and remove mapping macros here. XlXt,  
// DO NOT EDIT what you see in these blocks of generated code! Pc?"H!Hkn  
//}}AFX_MSG_MAP fJNK@F  
END_MESSAGE_MAP() leF!Uog  
g3Q;]8Y&  
CHookApp::CHookApp() hKg +A  
{ IPn!iv)  
 // TODO: add construction code here, r?~_^  
 // Place all significant initialization in InitInstance J3'q.Pc  
} "([gN:   
"1\GU1x  
CHookApp theApp; ]>Dbta.2 7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Xn~\Vb  
{ +P 9eE,WR  
 BOOL bProcessed=FALSE; r(>812^\  
 if(HC_ACTION==nCode) B&7:=t,m(  
 { !Mgo~h"]#  
  if((lParam&0xc0000000)==0xc0000000){// Key up eU)QoVt  
   switch(wParam) G]$EIf'  
   { UvU@3[fw  
    case VK_MENU: $KT)Kz8tF  
     MaskBits&=~ALTBIT; T++q.oFc  
     break; @#^Y# rxb  
    case VK_CONTROL: iD cYyNE  
     MaskBits&=~CTRLBIT; "J*>g(H53  
     break; q77qdm q7  
    case VK_SHIFT: |aU8WRq  
     MaskBits&=~SHIFTBIT; Q(Yn8t  
     break; cDYO Ju.  
    default: //judge the key and send message .*n*eeD,  
     break;  2rC&  
   } e?7NW  
   for(int index=0;index<MAX_KEY;index++){ :,yC\,H^  
    if(hCallWnd[index]==NULL) >\~Er@  
     continue; %TAS4hnu%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,o0Kevz  
    { `<P:l y.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FjizPg/|!  
     bProcessed=TRUE; @@-TW`G7  
    } ]ZP!y  
   } FSz<R*2  
  } -da: j-_  
  else if((lParam&0xc000ffff)==1){ //Key down K } T=j+  
   switch(wParam) @d^DU5ats>  
   { RO3q!+a$/  
    case VK_MENU: cL%"AVsj >  
     MaskBits|=ALTBIT; >hSu1s:  
     break; Jqgm>\y  
    case VK_CONTROL: 0;)Q  
     MaskBits|=CTRLBIT; - q(a~Ge  
     break; Yv)c\hm(7j  
    case VK_SHIFT: m6^#pqSL  
     MaskBits|=SHIFTBIT; \ntUxPox.  
     break; [n&ES\o#(  
    default: //judge the key and send message Zl'/Mx g  
     break; h-O;5.m-P  
   } @vib54G  
   for(int index=0;index<MAX_KEY;index++) ?7lW@U0  
   { SHB'g){P  
    if(hCallWnd[index]==NULL) av5a2r0W1  
     continue; BHU$QX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /ece}7M  
    { x)N QRd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VR1[-OE  
     bProcessed=TRUE; ? F!c"+C  
    } &w`DF,k|  
   } V?0IMc  
  } A)j!Wgs^z  
  if(!bProcessed){ ^~vM*.j~j  
   for(int index=0;index<MAX_KEY;index++){ 2A";o E  
    if(hCallWnd[index]==NULL) T%FW|jKw  
     continue; Z]tQmV8e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XHdhSFpm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f[R~oc5P0  
   } bWlY Q  
  } Y-st2r[,  
 } 4{vEW(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3` oOoKX  
} fE)o-q6Z  
6ce-92n  
BOOL InitHotkey() 3O Ks?i3A  
{ T>b"Gj/  
 if(hHook!=NULL){ \o72VHG66  
  nHookCount++; -&]!ig5v  
  return TRUE; l\Ww^   
 } XR[=W(m}  
 else E^ c *x^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ol h{<~Fv  
  if(hHook!=NULL) '|yCDBu  
   nHookCount++; @OFxnF`  
  return (hHook!=NULL); X6(s][Wn  
} a]%s ks  
BOOL UnInit() u8%X~K\  
{ -])=\n!=  
 if(nHookCount>1){ |6^%_kO!|  
  nHookCount--; 75> Ok/  
  return TRUE; F&7|`o3  
 } -r3 s{HO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); GP %hf{  
 if(unhooked==TRUE){ ]e7?l/N[  
  nHookCount=0; L@zhbWY  
  hHook=NULL; h7T),UL  
 } D `V.gV]  
 return unhooked; u,d5/`E  
} UuF(n$B  
y:Of~ ]9@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z_S{$D  
{ Gky^S#  
 BOOL bAdded=FALSE; nu~]9~)I  
 for(int index=0;index<MAX_KEY;index++){ $)8,dS  
  if(hCallWnd[index]==0){ dVHbIx  
   hCallWnd[index]=hWnd; R1w5,Zt  
   HotKey[index]=cKey; :{lP9%J-  
   HotKeyMask[index]=cMask; B@6L<oZ  
   bAdded=TRUE; g*LD}`X/-  
   KeyCount++; 8 Zp^/43  
   break; wD{c$TJ?{F  
  } pz)>y&_o  
 } G-RDQ  
 return bAdded; :lvBcFw  
} Qr7v^H~E4.  
0x]?rd+q8Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hh%?E\qM  
{ f^u-Myk  
 BOOL bRemoved=FALSE; kmt1vV.9  
 for(int index=0;index<MAX_KEY;index++){ bJD$!*r\%!  
  if(hCallWnd[index]==hWnd){ ysp`(n=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NsM`kZM4H  
    hCallWnd[index]=NULL; b l+g7g;  
    HotKey[index]=0; +`{OOp=  
    HotKeyMask[index]=0; q}VdPt>X/  
    bRemoved=TRUE; + Hv'u  
    KeyCount--; (1GU  
    break; +Y~5197V  
   } kL0K[O  
  } |vGHhzZ|  
 } Pgy[\t2K  
 return bRemoved; 6W=V8  
} E0&d*BI2  
fbbbTZy  
void VerifyWindow() Dat',5  
{ |Rhqi  
 for(int i=0;i<MAX_KEY;i++){ Q% d1n*;+  
  if(hCallWnd!=NULL){ Bi :!"Nw[X  
   if(!IsWindow(hCallWnd)){ |}UkVLc_^  
    hCallWnd=NULL; c-Yd> 4+ 1  
    HotKey=0; #eJ<fU6Da  
    HotKeyMask=0; V(DY!f_%  
    KeyCount--; j4!O,.!T  
   } {)!>e  
  } 1,bE[_  
 } ,#&7+e!]>P  
} 5Lej_uqF   
T>L?\-  
BOOL CHookApp::InitInstance()  +)e|>  
{ y;8&J{dd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); bP#!U'b"=  
 hins=AfxGetInstanceHandle(); A0k?$ko  
 InitHotkey(); <EN9s  
 return CWinApp::InitInstance(); }58MDpOF1  
} \ I523$a  
!%('8-x%  
int CHookApp::ExitInstance() 5ct&fjmR_  
{ )rG4Nga5}  
 VerifyWindow(); W [K.|8ho  
 UnInit(); Xw!\,"{s  
 return CWinApp::ExitInstance(); %%uE^nX>  
} 1d]F$ >  
u YT$$'S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  G7a l@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) JDE_*xaUV  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VLkAsM5}%  
#if _MSC_VER > 1000 [{BY$"b#:  
#pragma once bD:0k.`  
#endif // _MSC_VER > 1000 g]2L[4  
l$/lbwi%  
class CCaptureDlg : public CDialog wL 4Y%g  
{ '=fk;AiQ  
 // Construction %'HDP3  
 public: I_u/  
  BOOL bTray; N6}/TbfAR  
  BOOL bRegistered; jj2\;b:a0  
  BOOL RegisterHotkey(); k_0@,b 3  
  UCHAR cKey; !#O [RS  
  UCHAR cMask; Hn(1_I%zF  
  void DeleteIcon(); AO|9H`6U6F  
  void AddIcon(); U"p</Q  
  UINT nCount; V\<2oG  
  void SaveBmp(); R54[U  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X(nyTR8  
  // Dialog Data K=v:qY4Z  
  //{{AFX_DATA(CCaptureDlg) ^Q$OzsEk  
  enum { IDD = IDD_CAPTURE_DIALOG }; #T^2=7 w  
  CComboBox m_Key; y-1e(:GF  
  BOOL m_bControl; AT~,  
  BOOL m_bAlt; E3wL n/<  
  BOOL m_bShift; M }d:B)cz  
  CString m_Path; M[YFyM(  
  CString m_Number; A:r?#7 Ma  
  //}}AFX_DATA ~&73f7  
  // ClassWizard generated virtual function overrides "/i$_vl  
  //{{AFX_VIRTUAL(CCaptureDlg) ?s^3 o{!<W  
 public: TD}<U8I8_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 'YNdrvz  
 protected: 1" cv5U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1w^wa_qx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &HM-UC|  
  //}}AFX_VIRTUAL qM(}|fMbN  
  // Implementation k*hl"oL"X  
 protected: lZcNio  
  HICON m_hIcon; /^BC Qaj  
  // Generated message map functions E s5: S#  
  //{{AFX_MSG(CCaptureDlg) 'Be'!9K*d  
  virtual BOOL OnInitDialog(); `)n4I:)2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Pj-INc96  
  afx_msg void OnPaint(); \@:,A]  
  afx_msg HCURSOR OnQueryDragIcon(); EE!}$qOR  
  virtual void OnCancel(); [!A[oK9i C  
  afx_msg void OnAbout(); :-k|jt  
  afx_msg void OnBrowse(); `R[ZY!=+  
  afx_msg void OnChange(); &&X,1/  
 //}}AFX_MSG ,JV0ib,  
 DECLARE_MESSAGE_MAP() RU:Rt'  
}; e /JQ #A  
#endif %x$U(I}  
y~ =H`PAE  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `um,S  
#include "stdafx.h" ^hC'\09=c  
#include "Capture.h" MePD:;mm^  
#include "CaptureDlg.h" $>XeC}"x68  
#include <windowsx.h> ~t`s&t'c|  
#pragma comment(lib,"hook.lib") ?0VR2Yb${b  
#ifdef _DEBUG yJm"vN  
#define new DEBUG_NEW C|$q Vh>  
#undef THIS_FILE 6gg8 h>b  
static char THIS_FILE[] = __FILE__; $E\|\g  
#endif *Y m? gCig  
#define IDM_SHELL WM_USER+1 Dsg>~J'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I#M3cI!X?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fe?Z33V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RP&bb{Y  
class CAboutDlg : public CDialog 'jtC#:ePK  
{ K T}  
 public: 2d ! '9mA  
  CAboutDlg(); ` R6`"hx$  
  // Dialog Data \2i7\U  
  //{{AFX_DATA(CAboutDlg) #&&T1;z"#  
  enum { IDD = IDD_ABOUTBOX }; _>;Wz7  
  //}}AFX_DATA afEa@et'  
  // ClassWizard generated virtual function overrides fGo4&( U  
  //{{AFX_VIRTUAL(CAboutDlg) g>@JGzMLP  
 protected: 1sQIfX#2f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~7P)$[  
  //}}AFX_VIRTUAL W7i|uTM  
  // Implementation t;&XIG~  
 protected: ,S8K!  
  //{{AFX_MSG(CAboutDlg) @w[i%F,&`  
  //}}AFX_MSG y/lF1{}5  
  DECLARE_MESSAGE_MAP() *gbK :*_J  
}; \c=I!<9  
{*ak>Wud  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $cCC 1=dW  
{ V#t_gS  
 //{{AFX_DATA_INIT(CAboutDlg) T # \  
 //}}AFX_DATA_INIT "ZuuSi  
} &XP(D5lf`B  
ff"wg\O4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %@/^UE:  
{ J-F".6i5  
 CDialog::DoDataExchange(pDX); jVj5; }  
 //{{AFX_DATA_MAP(CAboutDlg) XIeLu"TSL  
 //}}AFX_DATA_MAP ~Iu!B Y  
} #%0V`BS7n  
~C.*Vc?|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0+1wi4wy/  
 //{{AFX_MSG_MAP(CAboutDlg) 1uw#;3<L  
 // No message handlers Ifj&S'():  
 //}}AFX_MSG_MAP VM"cpC_8  
END_MESSAGE_MAP() *Z5^WHwg  
[VCC+_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) tZrc4$D-  
: CDialog(CCaptureDlg::IDD, pParent) kNEEu! G  
{ _FLEz|%~  
 //{{AFX_DATA_INIT(CCaptureDlg) ^.SYAwL  
  m_bControl = FALSE; C_.9qo]DT7  
  m_bAlt = FALSE; \oQ]=dDCd%  
  m_bShift = FALSE; )*,/L <  
  m_Path = _T("c:\\"); @ D+ftb/  
  m_Number = _T("0 picture captured."); 'Wonz<{'  
  nCount=0; UkV?,P@l  
  bRegistered=FALSE; a^|DD#5  
  bTray=FALSE; dhl[=Y ` Q  
 //}}AFX_DATA_INIT BT$p~XB  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %\As  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \{,TpK.  
} W .7rHa  
m7 =$*1k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) GP|=4T}Bf  
{ R$awgSE  
 CDialog::DoDataExchange(pDX); IP~!E_e}\  
 //{{AFX_DATA_MAP(CCaptureDlg) Nkdv'e\  
  DDX_Control(pDX, IDC_KEY, m_Key); =8kmFXo  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); US6_5>/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FqKJids-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;t`  ?|  
  DDX_Text(pDX, IDC_PATH, m_Path); EP;/[O  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WeI+|V$  
 //}}AFX_DATA_MAP |.IH4 K  
} ^S9y7b^;r  
h`fVQN.3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) CUA @CZ6{  
//{{AFX_MSG_MAP(CCaptureDlg) mYBEjZ B  
 ON_WM_SYSCOMMAND() x%P|T3Qy5  
 ON_WM_PAINT() p|4qkJK8  
 ON_WM_QUERYDRAGICON() fn#8=TIDf  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }kbSbRH43  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -+9[X*VCc  
 ON_BN_CLICKED(ID_CHANGE, OnChange) adON&<  
//}}AFX_MSG_MAP bQll;U^A  
END_MESSAGE_MAP() ?Cq7_rq  
cw;wv+|k  
BOOL CCaptureDlg::OnInitDialog() ZO}Og&%  
{ #m+!<  
 CDialog::OnInitDialog(); l{3B }_,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t<%0eu|  
 ASSERT(IDM_ABOUTBOX < 0xF000); #c!:&9oU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Otn,UoeeB  
 if (pSysMenu != NULL) ?I.9?cQXZ  
 { x^f<G 6z  
  CString strAboutMenu; FB=oGgwwq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R{hX--|j  
  if (!strAboutMenu.IsEmpty()) 5:Qz  
  { o3ZN0j69|  
   pSysMenu->AppendMenu(MF_SEPARATOR); l/$GF|`U  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _Fb}zPU!  
  } JFq wC=-  
 } sE9FT#iE  
 SetIcon(m_hIcon, TRUE); // Set big icon 8 WP>u8&  
 SetIcon(m_hIcon, FALSE); // Set small icon $o6/dEKQ  
 m_Key.SetCurSel(0); Urj*V0^  
 RegisterHotkey(); C3AWXO ^  
 CMenu* pMenu=GetSystemMenu(FALSE); 2`yhxO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,m=F H?5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [+#m THX  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); e4X df>B  
 return TRUE; // return TRUE unless you set the focus to a control N&8TG  
} ?M2(8 0  
WxdQ^#AE  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )cf i@-J+#  
{ myx/|-V"F  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) !Jg;%%E3:i  
 { (Guzj*12  
  CAboutDlg dlgAbout; 4" @<bKx  
  dlgAbout.DoModal(); aCQtE,.  
 } N gNGq\!  
 else Hg+<GML  
 { z,HhSW?&^  
  CDialog::OnSysCommand(nID, lParam); }v(wjD  
 } 6*8Wtq  
} vr!J3H f  
91 jRIB  
void CCaptureDlg::OnPaint() Y~~Dg?e  
{ 9#LMK 1ge  
 if (IsIconic()) ,OZ  
 { .^YxhUH,G  
  CPaintDC dc(this); // device context for painting p_r`"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $QX$rN  
  // Center icon in client rectangle @xG&K{j  
  int cxIcon = GetSystemMetrics(SM_CXICON); | %_C$s%  
  int cyIcon = GetSystemMetrics(SM_CYICON); *% -<Ldv  
  CRect rect; PSrx !  
  GetClientRect(&rect); &\zYbGU  
  int x = (rect.Width() - cxIcon + 1) / 2; F<4rn  
  int y = (rect.Height() - cyIcon + 1) / 2; ;w{<1NH2+.  
  // Draw the icon `CK~x =  
  dc.DrawIcon(x, y, m_hIcon); uf(ayDE  
 } VA/2$5Wu  
 else 7KT*p&xm  
 { On C)f  
  CDialog::OnPaint(); Pz]WT1J0  
 } yUoR6w  
} ~f QrH%@  
r}U6LE?>  
HCURSOR CCaptureDlg::OnQueryDragIcon() C*`WMP*  
{ M!mL/*G@YE  
 return (HCURSOR) m_hIcon; Q G) s  
} j:9M${~  
HKN|pO3v  
void CCaptureDlg::OnCancel() %V_ XY+o  
{ Wzq W1<*`  
 if(bTray) 5C w( 4.  
  DeleteIcon(); p^l#Wq5  
  CDialog::OnCancel(); uH_KOiF  
} '.}}k!#  
w7)pBsI  
void CCaptureDlg::OnAbout() ~Ps*i]n(  
{ G T>'|~e  
 CAboutDlg dlg; <J%qzt}  
 dlg.DoModal(); F)P:lvp<r  
} z*3b2nV  
o'Bd. B  
void CCaptureDlg::OnBrowse() 6:1`lsP  
{ tldT(E6  
 CString str; [i.@q}c~E  
 BROWSEINFO bi; vrn4yHoZ  
 char name[MAX_PATH]; t]c<HDCK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?pL|eS7  
 bi.hwndOwner=GetSafeHwnd(); tX*@r  
 bi.pszDisplayName=name; B=Hd:P|  
 bi.lpszTitle="Select folder"; ]&'!0'3`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; o.s'0xP]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (6,:X  
 if(idl==NULL) HOW<IZ^  
  return; X)g X9DA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |$.?(FZYu  
 str.ReleaseBuffer(); z:'m50'  
 m_Path=str; D@=]mh6vl  
 if(str.GetAt(str.GetLength()-1)!='\\') ~tUZQ5"  
  m_Path+="\\"; #1YMpL  
 UpdateData(FALSE); j/v>,MM  
} P0N/bp2Uy  
/Qgb t  
void CCaptureDlg::SaveBmp() :kZ]Swi 5  
{ *h^->+0n  
 CDC dc; lM-\:Q!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cGot0' mB  
 CBitmap bm; v[CR$@Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); qxRsq&_  
 int Height=GetSystemMetrics(SM_CYSCREEN); lL}6IZ5sb  
 bm.CreateCompatibleBitmap(&dc,Width,Height); jAQ{H  
 CDC tdc; zK0M WyXO  
 tdc.CreateCompatibleDC(&dc); %PW-E($o<  
 CBitmap*pOld=tdc.SelectObject(&bm); $W._FAAJ#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -e_fn&2,Y  
 tdc.SelectObject(pOld); F6{g{ B  
 BITMAP btm; 1N/4W6  
 bm.GetBitmap(&btm); <Qq {&,Le  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; TtJX(N~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); He_O+[sc  
 BITMAPINFOHEADER bih; H UJqB0D ?  
 bih.biBitCount=btm.bmBitsPixel; ~B<\#oO  
 bih.biClrImportant=0; eDd& vf  
 bih.biClrUsed=0; #y\O+\4e  
 bih.biCompression=0; &Vj @){  
 bih.biHeight=btm.bmHeight; $.,PteYK  
 bih.biPlanes=1; j;$f[@0o  
 bih.biSize=sizeof(BITMAPINFOHEADER); >iyNZ]."\  
 bih.biSizeImage=size; ``xm##K  
 bih.biWidth=btm.bmWidth; ?[Yn<|  
 bih.biXPelsPerMeter=0; |:)Bo<8  
 bih.biYPelsPerMeter=0; W83d$4\d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )St0}?I~  
 static int filecount=0; p{?duq=  
 CString name; fb f&bJT  
 name.Format("pict%04d.bmp",filecount++); Q}#4Qz~n  
 name=m_Path+name; Z@Rqm:e  
 BITMAPFILEHEADER bfh; /X8a3Eqp9  
 bfh.bfReserved1=bfh.bfReserved2=0; mtUiO p  
 bfh.bfType=((WORD)('M'<< 8)|'B'); COi15( G2  
 bfh.bfSize=54+size; m?-)SA  
 bfh.bfOffBits=54; V7$ m.P#uM  
 CFile bf; Yjg$o:M  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 3P_.SF  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1@Ba7>%'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Hc/7x).  
  bf.WriteHuge(lpData,size); e`Yj}i*bx]  
  bf.Close(); 4Q+,_iP  
  nCount++; _0[z xOI  
 } NK-}[!f  
 GlobalFreePtr(lpData); ,|f=2t+5X  
 if(nCount==1) 9^^\Z5  
  m_Number.Format("%d picture captured.",nCount); x ]VycS  
 else B"v*[p?  
  m_Number.Format("%d pictures captured.",nCount); mbAzn  
  UpdateData(FALSE); ~#g c{ C@  
} O!PGZuF  
U" @5R[=F-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jS,Pu%fR  
{ c[J 2;"SP  
 if(pMsg -> message == WM_KEYDOWN) gd[muR ~  
 { WjBml'^RY  
  if(pMsg -> wParam == VK_ESCAPE) U/c+j{=~  
   return TRUE; Iq|h1ie m+  
  if(pMsg -> wParam == VK_RETURN) HX.K{!5  
   return TRUE; Cq@7oi]W0  
 } %>&~?zrq  
 return CDialog::PreTranslateMessage(pMsg); a,rXG  
} _9oKW;7f7  
6I[*p0j5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mI2Gs) SO  
{ hLfWDf*T|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  2  
  SaveBmp(); I/'>MDB!  
  return FALSE; !fs ~ >  
} %g*nd#wG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7L+Wj }m  
 CMenu pop; *wAX&+);  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E[hSL#0  
 CMenu*pMenu=pop.GetSubMenu(0); /A5=L<T6F  
 pMenu->SetDefaultItem(ID_EXITICON); }51QUFhL0  
 CPoint pt; ^uo,LTq+  
 GetCursorPos(&pt); +R?E @S  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Gb2|e.z  
 if(id==ID_EXITICON) hzbvR~rn  
  DeleteIcon(); :qS~"@?<  
 else if(id==ID_EXIT) Qc33C A  
  OnCancel(); uWGp>;meO  
 return FALSE; *7*_QW%?A  
} TaF*ZT2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n4?;!p<F  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }?b\/l<  
 AddIcon(); U>Is mF>m  
 return res; TrZ!E`~  
} kW+>"3  
C\rT'!Uk\Q  
void CCaptureDlg::AddIcon() ZyDf@(z`  
{ DmoY],9I+p  
 NOTIFYICONDATA data; VK9E{~0=  
 data.cbSize=sizeof(NOTIFYICONDATA); [/ CB1//Y  
 CString tip; !d0$cF):  
 tip.LoadString(IDS_ICONTIP); ~#EXb?#uS  
 data.hIcon=GetIcon(0); gISA13  
 data.hWnd=GetSafeHwnd(); SFzoRI=qG  
 strcpy(data.szTip,tip); [:,|g;=Y}  
 data.uCallbackMessage=IDM_SHELL; uUl ;}W  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; c[1{>z{G  
 data.uID=98; jKP75jm  
 Shell_NotifyIcon(NIM_ADD,&data); [L7S`Z  
 ShowWindow(SW_HIDE); 2!f'l'}  
 bTray=TRUE; bil>;&h  
} 7ey|~u2  
57 Vn-  
void CCaptureDlg::DeleteIcon() 9U9ghWH8  
{ ILNghtm-  
 NOTIFYICONDATA data; aorL,l  
 data.cbSize=sizeof(NOTIFYICONDATA); AB!({EIi  
 data.hWnd=GetSafeHwnd(); T5@t_D>8  
 data.uID=98; +=`w  
 Shell_NotifyIcon(NIM_DELETE,&data); a Sm</@tO&  
 ShowWindow(SW_SHOW); yokZ>+jb  
 SetForegroundWindow(); \#h=pz+jb  
 ShowWindow(SW_SHOWNORMAL); Jx3a7CpX  
 bTray=FALSE; 7DW-brd   
} )W@  
4P2p|Gc3  
void CCaptureDlg::OnChange() ),<h6$  
{ "{{@N4^  
 RegisterHotkey(); PzjIM!>  
} 4/o9K*M+  
54JI/!a  
BOOL CCaptureDlg::RegisterHotkey() Z,3CMWHg  
{ DL_M#c`<  
 UpdateData(); xoSBMf  
 UCHAR mask=0; ;?o"{mbb  
 UCHAR key=0; ^J?2[(   
 if(m_bControl) KE)^S [Da  
  mask|=4; j{5oXW  
 if(m_bAlt) XF4NRs  
  mask|=2; 0O q5;5  
 if(m_bShift) m[5ed1+  
  mask|=1; lKirc2  
  key=Key_Table[m_Key.GetCurSel()]; UR`pZ.U?  
 if(bRegistered){ @[(%b{TE;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :Ea ]baM"  
  bRegistered=FALSE; {-IRX)m*  
 } YkV-]%c  
 cMask=mask; %D^j7`Z  
 cKey=key; :)e/(I]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [s!cc:JR  
 return bRegistered; )o_$AbPt  
} 87V XVI  
`tsqnw  
  四、小结 i];@e]   
X<"#=u(  
  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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