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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: j\`EUC  
  r zMFof  
  一、实现方法 yV:EK{E  
:DdBn.  
  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: _{LN{iqDv  
yn/?= ?0  
#pragma data_seg("shareddata") I*A0?{  
HHOOK hHook =NULL; //钩子句柄 3Q'[Ee2-3  
UINT nHookCount =0; //挂接的程序数目 }W:*aU  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \7Gg2;TA6o  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V#'26@@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey e2AN[Ar  
static int KeyCount =0; I 1b  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 $J QWfGwR  
#pragma data_seg() Q_&}^  
hrs#ZZ:E  
  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。 m~)Fr8Wh6  
bZNIxkc[Dh  
  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: 9 wO/?   
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 7FmbV/&c  
cKey,UCHAR cMask) qwq/Xcv  
{ . i{>Z  
 BOOL bAdded=FALSE; .FIt.XPzv  
 for(int index=0;index<MAX_KEY;index++){ omM&{ }8g  
  if(hCallWnd[index]==0){ ~ X-)_zH  
   hCallWnd[index]=hWnd; p?+lAbe6H  
   HotKey[index]=cKey; Sa3I?+  
   HotKeyMask[index]=cMask; vk  @%R  
   bAdded=TRUE; 1)TK01R8  
   KeyCount++; dB@Wn!Y  
   break; , CJAzGBS  
  } 4. 1rJa  
 } [YC=d1F5  
 return bAdded; 9$7&URwSDI  
} Ts|--,  
//删除热键 +kjzn]} f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9[cp7 Rcb  
{ fCgBH~w,9  
 BOOL bRemoved=FALSE; eeuZUf+~]  
 for(int index=0;index<MAX_KEY;index++){ :GU,EDps  
  if(hCallWnd[index]==hWnd){ _& 8O~8tW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &qJPwO  
    hCallWnd[index]=NULL; ;~ W8v.EW  
    HotKey[index]=0; Zimh _  
    HotKeyMask[index]=0; SArfczoB  
    bRemoved=TRUE; G 1]"s@8(  
    KeyCount--; 8YNu<   
    break; TT'Ofvdc  
   } kf<c, 3A  
  } CY34X2F  
 } 81~Kpx  
 return bRemoved; A0G)imsW:_  
}  t?gJNOV  
a%Uw;6|{  
41u*w2j  
  DLL中的钩子函数如下: 1hl]W+9  
<0CzB"Ap  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Lp_$?MCD.  
{ `/z_rqJ0CL  
 BOOL bProcessed=FALSE; {jvOHu  
 if(HC_ACTION==nCode) EE+`i%  
 { UQ/qBbn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  s[3e=N  
   switch(wParam) y8G&Wg aCi  
   {  P Q7A~dw9  
    case VK_MENU: Y4d3n  
     MaskBits&=~ALTBIT; XMGx ^mn  
     break; /QQ8.8=5  
    case VK_CONTROL: LH4>@YPGE#  
     MaskBits&=~CTRLBIT; {3VZ3i  
     break; pD"YNlB^  
    case VK_SHIFT: /D]Kkm)  
     MaskBits&=~SHIFTBIT; *c{wtl@  
     break; J^ `hbP+2  
    default: //judge the key and send message 8O>}k  
     break; !<&m]K  
   } *n8%F9F  
   for(int index=0;index<MAX_KEY;index++){ 7W"/ N#G  
    if(hCallWnd[index]==NULL) x<)G( Xe*  
     continue;  >1A*MP4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OA[&Za#w  
    { P}0*{%jB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F*M|<E=  
     bProcessed=TRUE; moMYdArj  
    } >&OUGu|  
   } #/|75 4]]  
  } zrs<#8!Y_!  
  else if((lParam&0xc000ffff)==1){ //有键按下 d{f@K71*  
   switch(wParam) -T7%dLHY  
   { b/t  
    case VK_MENU: } ^i b  
     MaskBits|=ALTBIT; -_NC%iN#C  
     break; =VNSi K>F  
    case VK_CONTROL: Y2C9(Zk U  
     MaskBits|=CTRLBIT; b.s9p7:J  
     break; 3t)v %S|k  
    case VK_SHIFT: hrbo:8SL  
     MaskBits|=SHIFTBIT; {Hl[C]25X  
     break; UfO7+_2  
    default: //judge the key and send message <\" .L  
     break; (zG.aaz*C  
   } .-0%6] cFD  
   for(int index=0;index<MAX_KEY;index++){ $6T3y8  
    if(hCallWnd[index]==NULL) ' _dzcN,z  
     continue; K$H <}e3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) piOXo=9H.  
    { ,w{m3;]_%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6-B 9na  
     bProcessed=TRUE; m*Lo|F  
    } #]9hTa IR  
   } 9AHSs,.t  
  } - hzjV|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +Ng0WS_0  
   for(int index=0;index<MAX_KEY;index++){ ahJ1n<  
    if(hCallWnd[index]==NULL) B<7/,d'  
     continue; 2| B[tt1Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >E:<E'L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eWvo,4  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 MAqLIf<G  
   }  QV qK  
  } 0)|Q6*E>  
 } S:q$?$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [3N[i(Wlk  
} Ri#H.T<'  
B@O@1?c[  
  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: at6149B\)  
]"F5;p; y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /qU>5;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k%P;w1  
fQ 7vL~E  
  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: Q6 ?z_0  
@*MC/fe  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) FB:<zmwR  
{ #z!^ <,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) aRJcSV  
 { Jq ]:<TQ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ZDx@^P y  
  SaveBmp(); V-!"%fO.s  
  return FALSE; Kmz7c|  
 } DNkWOY#{  
 …… //其它处理及默认处理 eKN$jlg  
} Bfr'Zdw  
F7MzCZvu  
]XA4;7  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ,FZT~?  
06*rWu9P3  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 `zpbnxOL$T  
^YvB9XN  
  二、编程步骤 g~S)aU\:,  
% ."@Q$lA  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; N^w'Hw0  
1tMQqI`N  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !k&Q 5s:  
@}s$]i$|-  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 7v7G[n  
_:`!DIz~9}  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; CO?Xt+1hR  
Y+~g\z-]c  
  5、 添加代码,编译运行程序。 x9W(cKB'S  
/mM2M-  
三、程序代码 O 5 Nb  
}(XdB:C8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL v$wBxCY  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) q<#>HjC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ vuQ%dDxI  
#if _MSC_VER > 1000 -e u]:4  
#pragma once \5)htL1F  
#endif // _MSC_VER > 1000 :_kAl? eJ  
#ifndef __AFXWIN_H__ ]i*](UQ  
#error include 'stdafx.h' before including this file for PCH ,`A?!.K$  
#endif " =] -%B  
#include "resource.h" // main symbols QK`i%TXJ  
class CHookApp : public CWinApp P u0uKE  
{ !0,Mp@ j/  
 public: ,TJ D$^  
  CHookApp(); ;z~n.0'  
  // Overrides >q~l21dUi  
  // ClassWizard generated virtual function overrides ,Gk}"w  
  //{{AFX_VIRTUAL(CHookApp) mTNVU@TY=  
 public: 2[fN\e{  
  virtual BOOL InitInstance(); MZJ]Dwt]  
  virtual int ExitInstance(); &w 8)* T  
  //}}AFX_VIRTUAL clw%B  
  //{{AFX_MSG(CHookApp) A"5z6A4WB  
  // NOTE - the ClassWizard will add and remove member functions here. 9@ 16w  
  // DO NOT EDIT what you see in these blocks of generated code ! 9Z5D\yv?H  
  //}}AFX_MSG 3q:n'PC)C  
  DECLARE_MESSAGE_MAP() !R-z%  
}; 6[E|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ] b9-k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6]zd.W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =qy=-j]  
BOOL InitHotkey(); 4_v]O  
BOOL UnInit(); {O<l[|Ip  
#endif C:8_m1Y{  
:,b iyJt  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {gNV[45  
#include "stdafx.h" >gwz,{  
#include "hook.h" 5}$b0<em~  
#include <windowsx.h> ;Vik5)D2D  
#ifdef _DEBUG *=V7@o  
#define new DEBUG_NEW *'Y@3vKE  
#undef THIS_FILE m!z|h9Ed  
static char THIS_FILE[] = __FILE__; )}vNOE?X~  
#endif ps .]N   
#define MAX_KEY 100 'J&f%kx"  
#define CTRLBIT 0x04 v[plT2"s  
#define ALTBIT 0x02 mGUO6>g  
#define SHIFTBIT 0x01 OA/WtQ5  
#pragma data_seg("shareddata") cKb)VG^  
HHOOK hHook =NULL; $D v\ e  
UINT nHookCount =0; r_e7a6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =0;}K@(J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4'4\ ,o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey iy.2A!f^.  
static int KeyCount =0; ,lA.C%4au~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P}ok*{"J<>  
#pragma data_seg() Z[\ O=1E,  
HINSTANCE hins; pD]0`L-HJU  
void VerifyWindow(); )irRO8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Y HSYu  
//{{AFX_MSG_MAP(CHookApp) "8^5>EJWv  
// NOTE - the ClassWizard will add and remove mapping macros here. u]u[(K5F  
// DO NOT EDIT what you see in these blocks of generated code! OouPj@r  
//}}AFX_MSG_MAP ac kqH+'  
END_MESSAGE_MAP() P`s  
-/{ 4Jf Wf  
CHookApp::CHookApp() x3qW0K8  
{ jdE5~a+  
 // TODO: add construction code here, -C(b,F%%  
 // Place all significant initialization in InitInstance 9% l%  
} Yt|6 X:l  
8]4U`\k4  
CHookApp theApp; 63`{.yZ*z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V-n&oCS+f  
{ SS`qJZ|w  
 BOOL bProcessed=FALSE; +w@M~?>  
 if(HC_ACTION==nCode) 2C{H$ A,pW  
 { U9D!GKVp  
  if((lParam&0xc0000000)==0xc0000000){// Key up ? (*t@ {k  
   switch(wParam) &E xYXI  
   { x+f2GA$  
    case VK_MENU: 5JEbe   
     MaskBits&=~ALTBIT; DvvT?K  
     break; `n$5+a+  
    case VK_CONTROL: :l|%17N  
     MaskBits&=~CTRLBIT; '47P|t  
     break; 2I*;A5$N1  
    case VK_SHIFT: fDG0BNLY  
     MaskBits&=~SHIFTBIT; |6=p{ y  
     break; xI>A6  
    default: //judge the key and send message &Tl 0Pf  
     break; ^rvx!?zO  
   } O6IB. >T  
   for(int index=0;index<MAX_KEY;index++){ vSi_t K4  
    if(hCallWnd[index]==NULL) WTImRXK4  
     continue; K'K2X-E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6[OzU2nB  
    { 3~nnCR[R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N3u((y/  
     bProcessed=TRUE; >#,G}xf  
    } 6#IU*  
   } /axIIfx-  
  } ui(^k $  
  else if((lParam&0xc000ffff)==1){ //Key down 0b4R  
   switch(wParam) %Y!Yvw^&P(  
   { /dv<qp  
    case VK_MENU: el:9wq  
     MaskBits|=ALTBIT; 5@^ dgq  
     break; bdGIF'p%  
    case VK_CONTROL: p_rN1W Dd'  
     MaskBits|=CTRLBIT; Qh)|FQ[s$r  
     break; _7-"Vo X  
    case VK_SHIFT: QV nO  
     MaskBits|=SHIFTBIT; I ybl;u  
     break; &*jxI[  
    default: //judge the key and send message dAu^{1+2  
     break; Q\&AlV  
   } ki[;ZmQq Y  
   for(int index=0;index<MAX_KEY;index++) r~S!<9f  
   { mp&Le YYn  
    if(hCallWnd[index]==NULL) K $Mx}m7l  
     continue; 3Eb nZb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [(D}%+2   
    { NZfo`iHAN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1Qp1Es<)  
     bProcessed=TRUE; W+#}~2&Dv  
    } 4FfwpO3,Ku  
   } ?c|`R1D  
  } U6/m_`nc  
  if(!bProcessed){ :0J-ek.;  
   for(int index=0;index<MAX_KEY;index++){ jw`&Np2Q  
    if(hCallWnd[index]==NULL) pl jV|.?  
     continue; ]ro1{wm!WU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *eJhd w*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oyKt({  
   } a z:~{ f*-  
  } ?:#>^eWYe7  
 } Ez7V>FNX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); M^|"be~{'  
} Q9Y9{T  
MFc=B`/X  
BOOL InitHotkey() !7O=<  
{ z/eU^2V  
 if(hHook!=NULL){ FT|/ WZR  
  nHookCount++; 9,iq"dQ  
  return TRUE; sx;V,"Y  
 } vWnHC  
 else vOvxQS}dBp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &J5-'{U|0  
  if(hHook!=NULL) u7WTSL%  
   nHookCount++; HKEop  
  return (hHook!=NULL); !#@4xeBPo  
} Mm>zpB`qP  
BOOL UnInit() 3/A[LL|  
{ 6k@%+<1  
 if(nHookCount>1){ T!=20!I  
  nHookCount--; I:uQB!  
  return TRUE; }\PE {  
 } 'gk81@|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .236d^l  
 if(unhooked==TRUE){ 4'}_qAT  
  nHookCount=0; v$.JmL0^J  
  hHook=NULL; "lv:hz  
 } 1OiZNuI:E  
 return unhooked; j{7ilo(i  
} )CwMR'LV  
M f%^\g.}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .(MbP  
{ i#M a -0#  
 BOOL bAdded=FALSE; Y1U"HqNl*  
 for(int index=0;index<MAX_KEY;index++){ t9f4P^V`  
  if(hCallWnd[index]==0){ {.' ,%)  
   hCallWnd[index]=hWnd; ,<^tsCI  
   HotKey[index]=cKey; 4t%:O4 3e  
   HotKeyMask[index]=cMask; t]u(jX)  
   bAdded=TRUE; 7tf81*e  
   KeyCount++; 7(|3 OR+  
   break; JEm?26n X  
  } wH(vX<W-E  
 } G+ $)W u  
 return bAdded; zP{<0o  
} NU)`js  
UuOLv;v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6'No4[F 4n  
{ Gw\G+T?M-  
 BOOL bRemoved=FALSE; 'sjJSc  
 for(int index=0;index<MAX_KEY;index++){ =7J|KoKK  
  if(hCallWnd[index]==hWnd){ :C|>y4U&(s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g'}`FvADi  
    hCallWnd[index]=NULL; u]]5p[ |S  
    HotKey[index]=0; [)J49  
    HotKeyMask[index]=0; PPj6QJ]R0  
    bRemoved=TRUE; [o[v"e\w  
    KeyCount--; .Kh(F 6 s  
    break; ) v[Knp'  
   } {>UMw>T[  
  } '^-4{Y^2E  
 } RBK>Lws6  
 return bRemoved; cDQw`ORP*g  
} G0 nH Z6  
LDi ez i  
void VerifyWindow() o+X'(!Trw  
{ >QZt)<[  
 for(int i=0;i<MAX_KEY;i++){ OB*Xb*HN  
  if(hCallWnd!=NULL){ iRj x];:Vu  
   if(!IsWindow(hCallWnd)){ d4/`:?w  
    hCallWnd=NULL; KWigMh\r  
    HotKey=0; zZ+LisSs&  
    HotKeyMask=0; BJO~$/R?v  
    KeyCount--; _OknP2E  
   } Z:B Y*#B  
  } c&Su d, &  
 } T`w};]z^d2  
} *09\\ G  
qK6  uU9z  
BOOL CHookApp::InitInstance() 32-3C6f@oZ  
{ GdfK xSO  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'De'(I  
 hins=AfxGetInstanceHandle(); m[xf./@f{  
 InitHotkey(); ZoNNM4M+  
 return CWinApp::InitInstance(); QkCoW[sn  
} *p#YK|  
&;@b&p+  
int CHookApp::ExitInstance() X!M fJ^)q  
{ Xv5Ev@T  
 VerifyWindow(); &PQ{e8w  
 UnInit(); e/HX,sf_g  
 return CWinApp::ExitInstance(); ZAo)_za&mH  
} K}5 $;W#  
vu.S>2Wv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s!o<Pd yJK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X$9D0;L  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ R SWB!-  
#if _MSC_VER > 1000 48&KdbGX  
#pragma once fssL'DD  
#endif // _MSC_VER > 1000 4KSP81}/\  
$OFFH[_z  
class CCaptureDlg : public CDialog XUqE5[O%  
{ s<r.+zqW  
 // Construction _KkVI7a  
 public: x4m_(CtK  
  BOOL bTray; |_xiG~  
  BOOL bRegistered; "w|k\1D  
  BOOL RegisterHotkey(); Ppb2"Ik  
  UCHAR cKey; /wxxcq  
  UCHAR cMask; .IAHy)li"  
  void DeleteIcon(); 'xrbg]b%  
  void AddIcon(); IwgA A)H  
  UINT nCount; Wn,g!rB^@  
  void SaveBmp(); | C2.Zay  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CIik@O*  
  // Dialog Data tv=FFfQ  
  //{{AFX_DATA(CCaptureDlg) E?q'|f  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1'U%7#;E  
  CComboBox m_Key; p_40V%y^  
  BOOL m_bControl; ;k41+O:f@  
  BOOL m_bAlt; _]r)6RT  
  BOOL m_bShift; wgR@M[]o;  
  CString m_Path; l-h7ksRs  
  CString m_Number; "RJk7]p`*  
  //}}AFX_DATA TcKKI  
  // ClassWizard generated virtual function overrides 7E6?)bgh  
  //{{AFX_VIRTUAL(CCaptureDlg) 2,e|,N"zN  
 public: |xgCV@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8H`l"  
 protected: qyBK\WqaP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )J6b:W  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fi4/@tV?$L  
  //}}AFX_VIRTUAL % /4_|@<'  
  // Implementation J%[N-  
 protected: T#^6u)  
  HICON m_hIcon; }9Dv\"t5  
  // Generated message map functions  B3+WOf5W  
  //{{AFX_MSG(CCaptureDlg) c%3 @J+z  
  virtual BOOL OnInitDialog(); 53&xTcv}x  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \utH*;J|x  
  afx_msg void OnPaint(); dv9Pb5i  
  afx_msg HCURSOR OnQueryDragIcon(); nu9k{owB T  
  virtual void OnCancel(); .idl@%  
  afx_msg void OnAbout(); +VW]%6 +  
  afx_msg void OnBrowse(); 2Ku#j ('  
  afx_msg void OnChange(); x2&! PpM  
 //}}AFX_MSG xY'YbHFz  
 DECLARE_MESSAGE_MAP() 1H[;7@o$e  
}; QEHZ=Yg%3  
#endif W6/p-e5y  
+#db_k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file z`:^e1vG  
#include "stdafx.h" gGdYh.K&e5  
#include "Capture.h" awW\$Q  
#include "CaptureDlg.h" `M<G8ob  
#include <windowsx.h> yhn $4;m  
#pragma comment(lib,"hook.lib") .p0n\ $r  
#ifdef _DEBUG 5F+ f'~  
#define new DEBUG_NEW !<PTsk F  
#undef THIS_FILE Z6AU%3]  
static char THIS_FILE[] = __FILE__; 3Co>3d_  
#endif Cwa0!y5%  
#define IDM_SHELL WM_USER+1 ^t%M   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i@j ?<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )ZU#19vr7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lz0]p  
class CAboutDlg : public CDialog >)Z2bCe  
{ cWy0N  
 public: 43Uy<%yb>}  
  CAboutDlg(); VQ;- dCV  
  // Dialog Data r$eL-jQmn  
  //{{AFX_DATA(CAboutDlg) 3K:Xxkk  
  enum { IDD = IDD_ABOUTBOX }; XBt0Ez  
  //}}AFX_DATA knZd}?I*  
  // ClassWizard generated virtual function overrides `/Jr8J_  
  //{{AFX_VIRTUAL(CAboutDlg) "lzg@=$|)  
 protected: 5e8-?w% e  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g\nL n#  
  //}}AFX_VIRTUAL A"ph!* i{  
  // Implementation kRa$jD^?  
 protected: "m)O13x  
  //{{AFX_MSG(CAboutDlg) .7Bav5 ;  
  //}}AFX_MSG kV%y%l(6  
  DECLARE_MESSAGE_MAP() ,^66`C[G  
}; P3FpU<OBwp  
2m}]z.w#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &|FG#.2yw  
{ yXl.Gq>]{  
 //{{AFX_DATA_INIT(CAboutDlg) 2-2LmxLG  
 //}}AFX_DATA_INIT 3lgy X/?o  
} h4xdE 0  
/ ^M3-5@Q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XxQ2g&USk  
{ =,Um;hU3r  
 CDialog::DoDataExchange(pDX); a #**96Av  
 //{{AFX_DATA_MAP(CAboutDlg) ^o<Nz8  
 //}}AFX_DATA_MAP F+^[8zK^  
} a2)*tbM 9\  
>'g60R[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ATewdq[C  
 //{{AFX_MSG_MAP(CAboutDlg) m{Xf_rQ w  
 // No message handlers T js{ )r9  
 //}}AFX_MSG_MAP d-&dA_ ?  
END_MESSAGE_MAP() o%Q'<0d  
cwU6}*_zn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p)] ^>-L  
: CDialog(CCaptureDlg::IDD, pParent) [o6<aE-  
{ uV\#J{'*  
 //{{AFX_DATA_INIT(CCaptureDlg) 3VgH* vAU}  
  m_bControl = FALSE; I`lH6hHp  
  m_bAlt = FALSE; \srOU|  
  m_bShift = FALSE; <"9Z7" >  
  m_Path = _T("c:\\"); P9~kN|  
  m_Number = _T("0 picture captured."); L )"w-,zy  
  nCount=0; 2a}_|#*  
  bRegistered=FALSE; @WUCv7U  
  bTray=FALSE; Gwk@X/q  
 //}}AFX_DATA_INIT ~t$VzL1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J sdEA  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ../(gG9  
} |'(IWU  
h 'CLf]  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) XwGJ 8&N  
{ t/c^hTT  
 CDialog::DoDataExchange(pDX); )2\a5iH  
 //{{AFX_DATA_MAP(CCaptureDlg) PkO(Y!  
  DDX_Control(pDX, IDC_KEY, m_Key); 6n4S$a  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); wIPDeC4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VJPPHJ[-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); UcIR0BYa  
  DDX_Text(pDX, IDC_PATH, m_Path); ku=q:ry O  
  DDX_Text(pDX, IDC_NUMBER, m_Number); zy5bDL -  
 //}}AFX_DATA_MAP 4K,&Q/Vdd7  
} o W [-?  
RR9s%>^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oOvbel`;  
//{{AFX_MSG_MAP(CCaptureDlg) \8H"lcj:  
 ON_WM_SYSCOMMAND() oOw"k*,h:S  
 ON_WM_PAINT() ^ `9OA`2  
 ON_WM_QUERYDRAGICON() g M.(BN  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) iE{SqX  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <]J5AdJ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [:Y^0[2  
//}}AFX_MSG_MAP {rr\hl-$  
END_MESSAGE_MAP() E_#&L({|@  
q9Wtu7/  
BOOL CCaptureDlg::OnInitDialog() tp0*W _<4  
{ =Ih_[$1dw  
 CDialog::OnInitDialog(); JaTW/~ TU  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S|i //I%_  
 ASSERT(IDM_ABOUTBOX < 0xF000); JD .z}2+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kSrzIq<xre  
 if (pSysMenu != NULL) QX/`s3N  
 { Y"U&3e,  
  CString strAboutMenu; 3J{'|3x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z5zm,Jw  
  if (!strAboutMenu.IsEmpty()) n$K_KU v  
  { $~l :l[Zs  
   pSysMenu->AppendMenu(MF_SEPARATOR); \>Q,AyL  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ZGBcy}U(k  
  } _=p|"~rN$  
 } gqamGLK  
 SetIcon(m_hIcon, TRUE); // Set big icon _;+&'=6.[  
 SetIcon(m_hIcon, FALSE); // Set small icon :I8t}Wg  
 m_Key.SetCurSel(0); 1,,:4 *)  
 RegisterHotkey(); ~M=`f{-$K  
 CMenu* pMenu=GetSystemMenu(FALSE); (nG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Si(?+bda0c  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }r[BME  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [\y>Gv%  
 return TRUE; // return TRUE unless you set the focus to a control TW$^]u~v  
} 0Oq1ay^  
mNzZ/*n:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) e78}  
{ 6I<`N  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^  +G> N  
 { [o "@*kf  
  CAboutDlg dlgAbout; q}lSnWY[[  
  dlgAbout.DoModal(); HvU)GJ u b  
 } yCVBG  
 else :nn'>  
 { xMu6PM<l  
  CDialog::OnSysCommand(nID, lParam); -`JY] H  
 } N_U D7P1  
} 7(-<x@e  
K>U &jH  
void CCaptureDlg::OnPaint() (G Y`O  
{ /nNHI34  
 if (IsIconic()) %1<|.Dmd  
 { +Y+kx"8  
  CPaintDC dc(this); // device context for painting H3b`)k sFr  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "7d_$.Z  
  // Center icon in client rectangle MH-,+-Eq  
  int cxIcon = GetSystemMetrics(SM_CXICON); ! `o =2b=N  
  int cyIcon = GetSystemMetrics(SM_CYICON); "|H0 X#  
  CRect rect; %vI]"a@  
  GetClientRect(&rect); &+p07  
  int x = (rect.Width() - cxIcon + 1) / 2; d #su  
  int y = (rect.Height() - cyIcon + 1) / 2; 8^~]Ym:  
  // Draw the icon G}g+2`  
  dc.DrawIcon(x, y, m_hIcon); C\Rd]P8\  
 } idQr^{  
 else OmW|\d PU  
 { $0 )K [K  
  CDialog::OnPaint(); @,hvXl-G*  
 } `O F\f  
} 43YusUv  
sj1x>  
HCURSOR CCaptureDlg::OnQueryDragIcon() (]L=$u4  
{ G!uxpZ   
 return (HCURSOR) m_hIcon; wS*UXF&f  
} bk|>a=o3  
I[/u5V_b'  
void CCaptureDlg::OnCancel() H Zc;.jJ  
{ iD9GAe}x  
 if(bTray) kE1u-EA  
  DeleteIcon(); R~o?X ^^O  
  CDialog::OnCancel(); [F e5a  
} vKxwv YDe  
GauIe0qV  
void CCaptureDlg::OnAbout() (Qnn  
{ &7cy9Z~m  
 CAboutDlg dlg; FD8Hx\oF  
 dlg.DoModal(); K(hf)1q  
} mOBS[M5*  
59|Tmf(dS;  
void CCaptureDlg::OnBrowse() MZ.Jkf(  
{ A-kI_&g\Og  
 CString str; +Z+]Tqo  
 BROWSEINFO bi; [>fE{ ~Y  
 char name[MAX_PATH]; iqpy5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); gs'( px  
 bi.hwndOwner=GetSafeHwnd(); Z+4J4Ka^!(  
 bi.pszDisplayName=name; <D?`*#K  
 bi.lpszTitle="Select folder"; uKplPze?  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u+N[Cgh  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); '<O& :  
 if(idl==NULL) :%{8lanO  
  return; ;G ?_^ 0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z^b1i`v  
 str.ReleaseBuffer(); R lv|DED$  
 m_Path=str; S;= D/)[mr  
 if(str.GetAt(str.GetLength()-1)!='\\') D`+'#%%x  
  m_Path+="\\"; 8"? t6Z;5  
 UpdateData(FALSE); 7@:uVowQ  
} 0 I,-1o|s  
%NKf@If)  
void CCaptureDlg::SaveBmp() d)LifsD)  
{ ~FJd{$2x`  
 CDC dc; u(P D+Gz  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N. uw2Y%  
 CBitmap bm; [b`k\~N4r  
 int Width=GetSystemMetrics(SM_CXSCREEN); yZ K j>P1  
 int Height=GetSystemMetrics(SM_CYSCREEN); nI-\HAX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); V`G]4}  
 CDC tdc; D(y=0),  
 tdc.CreateCompatibleDC(&dc); [/I4Pe1Yj%  
 CBitmap*pOld=tdc.SelectObject(&bm); arnu|paw  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n@xU5Q  
 tdc.SelectObject(pOld); 0@z78h=h  
 BITMAP btm; {epsiHK@tK  
 bm.GetBitmap(&btm); 3AWg43L7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &BP%~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M!,WU[mP  
 BITMAPINFOHEADER bih;  {sbQf7)  
 bih.biBitCount=btm.bmBitsPixel; V7.EDE2A3  
 bih.biClrImportant=0; NcdOzx>  
 bih.biClrUsed=0; mZmwCS8  
 bih.biCompression=0; '/mwXvl  
 bih.biHeight=btm.bmHeight; 'w DNP_  
 bih.biPlanes=1; P9gIKOOx#4  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]R( =)  
 bih.biSizeImage=size; f"S^:F0  
 bih.biWidth=btm.bmWidth; [H!V  
 bih.biXPelsPerMeter=0; M Su_*&j9T  
 bih.biYPelsPerMeter=0; R{/nlS5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vU::dr  
 static int filecount=0; J 5~bs*a8  
 CString name; ">|fB&~A  
 name.Format("pict%04d.bmp",filecount++); ?me0J3u_  
 name=m_Path+name; Bc$t`PI  
 BITMAPFILEHEADER bfh; +Bgy@.a?  
 bfh.bfReserved1=bfh.bfReserved2=0; ((#|>W\&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); , j7&(V~  
 bfh.bfSize=54+size; qXgg"k%A\  
 bfh.bfOffBits=54; \G2&   
 CFile bf; PKk_9Xd  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W EZ)7H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); sdrALl;w|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &W*9'vSm.  
  bf.WriteHuge(lpData,size); 7aS`S F  
  bf.Close(); yqZKn=1:  
  nCount++;  RCKb5p9  
 } n"* A.  
 GlobalFreePtr(lpData); A\YP}sG1  
 if(nCount==1) uN2Ck  
  m_Number.Format("%d picture captured.",nCount); Ahm*_E2E  
 else d=`hFwD9  
  m_Number.Format("%d pictures captured.",nCount); ngE5$}UM  
  UpdateData(FALSE); qh{hpX)\D  
} Pi`}-GUe,  
+9M#-:qB  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) cE'MSB  
{ pwr,rAJ}$j  
 if(pMsg -> message == WM_KEYDOWN) z^bv)u  
 { *Mk5*_  
  if(pMsg -> wParam == VK_ESCAPE) NvY%sx,  
   return TRUE; X&b)E0]pR  
  if(pMsg -> wParam == VK_RETURN) um~U_&>  
   return TRUE; T|[zk.8=E  
 } "6o}g.  
 return CDialog::PreTranslateMessage(pMsg); l!5fuB8  
} /3{jeU.k  
.*+%-%CbP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {94qsVxQZ  
{ qf-0 | w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rZEL7{  
  SaveBmp(); Dn1aaN6  
  return FALSE; f5'Cq)Vw_  
} < j^8L^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %v5IR  
 CMenu pop; HJ~0_n&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rE)lt0mkv  
 CMenu*pMenu=pop.GetSubMenu(0); 9mZ[SQf  
 pMenu->SetDefaultItem(ID_EXITICON); (Rj'd>%c  
 CPoint pt; $DBJ"8n2  
 GetCursorPos(&pt); >|IUjv2L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >NDI<9<'0}  
 if(id==ID_EXITICON) Gf*|f"O  
  DeleteIcon(); hj[&.w  
 else if(id==ID_EXIT) <A"[Wk  
  OnCancel(); Xy0*1$IS]  
 return FALSE; k /srT<  
} Z7)la |  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xvU@,bzz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A0JlQE&U  
 AddIcon(); EbXWCD  
 return res; t*KgCk1  
} G*`Y~SJp  
-y]e`\+[  
void CCaptureDlg::AddIcon() u4hC/!  
{ ;d5d$Np@m&  
 NOTIFYICONDATA data; uf q9+}  
 data.cbSize=sizeof(NOTIFYICONDATA); Q6%dM'fR  
 CString tip; s 1~&PH^  
 tip.LoadString(IDS_ICONTIP); F)XO5CBK  
 data.hIcon=GetIcon(0); re[v}cB  
 data.hWnd=GetSafeHwnd(); *7cc4 wGQ  
 strcpy(data.szTip,tip); l<X8Ooan#{  
 data.uCallbackMessage=IDM_SHELL; =zBc@VTp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; c{4Y?SSx  
 data.uID=98; 0q}k"(9  
 Shell_NotifyIcon(NIM_ADD,&data); HFlMx  
 ShowWindow(SW_HIDE); ^I!u H1G  
 bTray=TRUE; 1!/WC.0  
} bMU0h,|]  
: ZehBu  
void CCaptureDlg::DeleteIcon() BeFCt;  
{ -aSj-  
 NOTIFYICONDATA data; f~a]og5|G  
 data.cbSize=sizeof(NOTIFYICONDATA); iTUOJ3V7i  
 data.hWnd=GetSafeHwnd(); _e4%<!1  
 data.uID=98; ( &N`N1  
 Shell_NotifyIcon(NIM_DELETE,&data); q#pD}Xe$  
 ShowWindow(SW_SHOW); 2":{3=oW~  
 SetForegroundWindow(); %OT} r  
 ShowWindow(SW_SHOWNORMAL); #z$g1\v  
 bTray=FALSE; :9?y-X  
} u?xXZ]_u-  
L JW0UF|  
void CCaptureDlg::OnChange() s[2>r#M  
{ s\/$`fuhx  
 RegisterHotkey(); J A!?vs  
} >/J!:Htk+K  
0*y|k1  
BOOL CCaptureDlg::RegisterHotkey() _|1m]2'9  
{ Wy:xiP  
 UpdateData(); Le,e,#hiY  
 UCHAR mask=0; 6Z ,GD  
 UCHAR key=0; ?R#?=<VkG  
 if(m_bControl) ^p7g[E&  
  mask|=4; ^t0Yh%V7  
 if(m_bAlt) pXPLTGY<R+  
  mask|=2; SobOUly5{  
 if(m_bShift) ;;f&aujSHD  
  mask|=1; n.L/Xp@gc  
  key=Key_Table[m_Key.GetCurSel()]; @T 5dPmn  
 if(bRegistered){ o%j[]P@4G  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E'KKR1t  
  bRegistered=FALSE; Q95`GuI@  
 } `PH]_]:%  
 cMask=mask; caH!(V}6  
 cKey=key; Aq3.%,X2H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zb_nU7Eg  
 return bRegistered; QY7Thnp1  
} lX)ZQY:=:  
SOg>0VH)  
  四、小结 aWg*f*2f  
<&47W  
  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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