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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: {<o_6 z`$  
  =o;8xKj  
  一、实现方法 Zsc710_  
*=mtt^yZ  
  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: k?3NF:Yy7  
_@;t^j+l  
#pragma data_seg("shareddata") <XiHQ B!  
HHOOK hHook =NULL; //钩子句柄 !#` .Mv Z  
UINT nHookCount =0; //挂接的程序数目 QI'ule  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Pqli3(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w2_$>z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pZUckQ  
static int KeyCount =0; x;dyF_*;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WM$}1:O  
#pragma data_seg() ~CCRs7V/L  
"MQy>mD6  
  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。 3Cmbt_WV  
X|fl_4NC>  
  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: _>+!&_h  
|N/Grk4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @?lmho?  
cKey,UCHAR cMask) j\k|5 ="w-  
{ _[u&}i  
 BOOL bAdded=FALSE; GcaLP*%>B  
 for(int index=0;index<MAX_KEY;index++){ e=&,jg?K  
  if(hCallWnd[index]==0){ FOVghq@  
   hCallWnd[index]=hWnd; n4\UoKq  
   HotKey[index]=cKey; d"o5uo  
   HotKeyMask[index]=cMask; ,|6 O}E&  
   bAdded=TRUE; ~Gm<F .(+  
   KeyCount++; U27YH1OK  
   break; + 2 v6fan  
  } 5IE3[a%X  
 } j}O~6A>|  
 return bAdded; $2uk;&"?A=  
} nX%b@cOXj  
//删除热键 U|SF;T .  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -!i1xR (;h  
{ 9MP_#M7  
 BOOL bRemoved=FALSE; 8*o*?1.  
 for(int index=0;index<MAX_KEY;index++){ BV)o F2b:  
  if(hCallWnd[index]==hWnd){ ~ +DPq|-O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z 0&=Lw  
    hCallWnd[index]=NULL; :Y wb  
    HotKey[index]=0; @A32|p}  
    HotKeyMask[index]=0; 1OI/!!t1$  
    bRemoved=TRUE; =T"R_3[NC  
    KeyCount--; TL u+5f  
    break; MX Qua:&HW  
   } g{PEplk  
  } (~S=DFsP  
 } ? nx3# <  
 return bRemoved; {BV0Y.O  
} (4]M7b[S$  
PU8>.9x  
|m{u]9  
  DLL中的钩子函数如下: 709/'#- ^  
P=3mLz-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }jE [vVlRw  
{ 7:/gO~g I  
 BOOL bProcessed=FALSE; lV%oIf[OB  
 if(HC_ACTION==nCode) Xz,fjKUnN  
 { KXrZ:4bg  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +/+>:  
   switch(wParam) m3T=x =  
   {  deLLqdZa  
    case VK_MENU: WwDd62g  
     MaskBits&=~ALTBIT; TXL!5, X_  
     break; x-nO; L-2p  
    case VK_CONTROL: 7l(GBr  
     MaskBits&=~CTRLBIT; px${ "K<  
     break; k~%j"%OB  
    case VK_SHIFT: sP:nTpTsC  
     MaskBits&=~SHIFTBIT; 8sus$:Ry  
     break; B6kc9XG  
    default: //judge the key and send message ,,G[360  
     break; gpw,bV  
   } 9%Eo<+my h  
   for(int index=0;index<MAX_KEY;index++){ ;kD UQw  
    if(hCallWnd[index]==NULL) a^o'KN{  
     continue; v<3KxP'a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a%nf )-}|  
    { % * k`z#b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;rRV=$y  
     bProcessed=TRUE; FG!2h&k  
    } pC~ M5(F_  
   } j:2TicHDC  
  } 6gs0Vm  
  else if((lParam&0xc000ffff)==1){ //有键按下 bWgRGJqt  
   switch(wParam) [XE\2Qa8e  
   { )b?$ 4<X^  
    case VK_MENU: ,njlKkFw^Z  
     MaskBits|=ALTBIT; \,xa_zeO  
     break; S6g_$ Q7  
    case VK_CONTROL: ^H0#2hFa  
     MaskBits|=CTRLBIT; ZkJLq[:cM  
     break; ?W>`skQ  
    case VK_SHIFT: 1xEFMHjy  
     MaskBits|=SHIFTBIT; A$M8w9  
     break; _\.4ofK(  
    default: //judge the key and send message P;`Awp?  
     break; '}^qz#w   
   } 43 vF(<r&f  
   for(int index=0;index<MAX_KEY;index++){ k!ID  
    if(hCallWnd[index]==NULL) %:s+5*SKe  
     continue; '&+]85_&$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jddhX]>I  
    { eEBo:Rc9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 78\j  
     bProcessed=TRUE; !1Hs;K  
    } KL6B!B{;  
   } ?7]G )8G6  
  } '?jsH+j+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 L+S)hgUH  
   for(int index=0;index<MAX_KEY;index++){ t`="2$NO  
    if(hCallWnd[index]==NULL) l$Vy\CfK3n  
     continue; &09&;KJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) wfv\xHG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5E]iv^q%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oI!"F=?&6  
   } sv!zY= 6  
  } \FUMfo^  
 } O,Tp,w T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); i\_LLXc  
} tz8 fZ*n  
gV-*z}`U  
  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: P z~jW):E  
|{Ex)hkw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ? )h8uf4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F3qCtx *N  
|gWA'O0S  
  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: G pI4QzR  
/@|iI<|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `<|tC#<z  
{ Ge/K.]>i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) eAo+w*D(  
 { UOFb.FRP>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 up+0-!AH  
  SaveBmp(); ~&<t++ g  
  return FALSE; 2 F>Y{3&  
 } "{r8'qn  
 …… //其它处理及默认处理 .;Mb4"7=  
} SzIzQR93&  
_?:jZ1wZ  
m5iCvOP  
  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。 [.^ol6  
+WAkBE/  
  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。 }ymW};W  
$K!Jm7O\  
  二、编程步骤 ~Ni  
nhdZC@~E0  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; L /:^;j`c  
}3A~ek#*~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >G8I X^*sG  
w$/lq~zU  
  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; r}&&e BY f  
rbnAC*y8'L  
  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; , + G  
ij!d-eM/b  
  5、 添加代码,编译运行程序。 {N>ju  
{ PX&#,_  
三、程序代码 +HBizJ9K  
7tXy3-~biz  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {QM rgyQ E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1R3,Z8j'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 3nG.ah  
#if _MSC_VER > 1000 ( ne[a2%>  
#pragma once 0: a2ER|J  
#endif // _MSC_VER > 1000  s[{[pIH  
#ifndef __AFXWIN_H__ ;O% H]oN  
#error include 'stdafx.h' before including this file for PCH aaig1#a@1b  
#endif tO{{ci$-T  
#include "resource.h" // main symbols Ny2 Z <TW  
class CHookApp : public CWinApp ]5jS6 @Vl*  
{ '";#v.!  
 public: &'$Bk5D@G  
  CHookApp(); mFF4qbe  
  // Overrides 3T8d?%.l  
  // ClassWizard generated virtual function overrides *sOb I(&  
  //{{AFX_VIRTUAL(CHookApp) +#MXeUX"  
 public: gMI%!Y  
  virtual BOOL InitInstance(); #zTy7ZS,0  
  virtual int ExitInstance(); 86OrJdD8  
  //}}AFX_VIRTUAL H[u9C:}9b  
  //{{AFX_MSG(CHookApp) /IWA U)A0  
  // NOTE - the ClassWizard will add and remove member functions here. )]j3-#  
  // DO NOT EDIT what you see in these blocks of generated code ! VkFh(Br<{  
  //}}AFX_MSG 8{jXSCP#  
  DECLARE_MESSAGE_MAP() [*^.$s(  
}; 6p4BsWPx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >8_y-74  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QCW4gIp  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YbU8 xq  
BOOL InitHotkey(); Nu6NyYs  
BOOL UnInit(); Cq!eAc  
#endif QT,T5Q%JP:  
zbxW U]<S?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QEs$9a5TE  
#include "stdafx.h" ;stuTj@vH  
#include "hook.h" 'hjEd.  
#include <windowsx.h> 8TFQ%jv  
#ifdef _DEBUG m`-);y  
#define new DEBUG_NEW X%'z  
#undef THIS_FILE #SHeK 4  
static char THIS_FILE[] = __FILE__; JJd qdX;  
#endif  pX_#Y)5  
#define MAX_KEY 100 =:&xdphZ+  
#define CTRLBIT 0x04 mLuNl^)3  
#define ALTBIT 0x02 W<)P@_+-  
#define SHIFTBIT 0x01 rw'+2\  
#pragma data_seg("shareddata") =IC.FT}  
HHOOK hHook =NULL; ,/w*sE  
UINT nHookCount =0; :/T\E\Qr  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \C3I6Qx  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ljd`)+`D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rM7qBt  
static int KeyCount =0; p/<DR |  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 13s/m&  
#pragma data_seg() (L/>LZn|  
HINSTANCE hins; >R F|Q  
void VerifyWindow(); }/a%-07R  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) oN1D&*  
//{{AFX_MSG_MAP(CHookApp) V.*TOU{{xh  
// NOTE - the ClassWizard will add and remove mapping macros here. 0VNLhM(LM  
// DO NOT EDIT what you see in these blocks of generated code! =K`.$R  
//}}AFX_MSG_MAP G}pFy0W\S  
END_MESSAGE_MAP() ^o3,YH  
bCw{9El!K4  
CHookApp::CHookApp() kG>jb!e@(  
{ a#j,0FKv  
 // TODO: add construction code here, 4EqThvI{  
 // Place all significant initialization in InitInstance ^>IP"kF  
} Yj&Sb  
jaoZ}}V_$  
CHookApp theApp; hObL=^F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  \(\a=  
{ _RIU,uJs  
 BOOL bProcessed=FALSE; huC{SzXM  
 if(HC_ACTION==nCode) *E/Bfp1LIe  
 { ;b{#$#`=  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4eHSAN"$  
   switch(wParam) ;_cTrjMv\  
   { ETHcZ  
    case VK_MENU: Ixxs(  
     MaskBits&=~ALTBIT; TWRP|i!i  
     break; G)7U &B  
    case VK_CONTROL: H~j@n!)  
     MaskBits&=~CTRLBIT; :'p)xw4K|  
     break; 7%^G ]AFi  
    case VK_SHIFT: <Q|\mUS6  
     MaskBits&=~SHIFTBIT; SxRJ{m~  
     break; 7h 54j  
    default: //judge the key and send message << 6 GE  
     break; $Z G&d  
   } v,-Tk=qP  
   for(int index=0;index<MAX_KEY;index++){ .RxTz9(  
    if(hCallWnd[index]==NULL) {xTq5`&gT  
     continue; Nn05me"X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0nwi5  
    { Xw4Eti._D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9+ 1{a.JO  
     bProcessed=TRUE; X?_rD'3  
    } ~wa4kS<>  
   } <X8Urum  
  } ,j%\3g`  
  else if((lParam&0xc000ffff)==1){ //Key down G+c&e:ip<  
   switch(wParam)  V(&L  
   { (ks>F=vk*  
    case VK_MENU: E'WXi!>7p  
     MaskBits|=ALTBIT; o-8{C0>:  
     break; wC{sP"D  
    case VK_CONTROL: lD0p=`.  
     MaskBits|=CTRLBIT; ]ae(t`\l^  
     break; *Dg@fxCQ  
    case VK_SHIFT: J*zzjtY( 1  
     MaskBits|=SHIFTBIT; 0!\gK <,z  
     break; [E9iuym  
    default: //judge the key and send message vU>^  
     break; Mk*4J]PP  
   } L0![SE>  
   for(int index=0;index<MAX_KEY;index++) ]t 0o%w  
   { }U7IMONU  
    if(hCallWnd[index]==NULL) )q<VZ|V  
     continue; dy6zrgxygP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !~E/Rp  
    { )?72 +X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g (&cq  
     bProcessed=TRUE; #eJfwc1JY  
    } EE'2<"M  
   } ika*w  
  } <Y)14w%  
  if(!bProcessed){ NCk-[I?R  
   for(int index=0;index<MAX_KEY;index++){ K\-N'M!Z  
    if(hCallWnd[index]==NULL) 1sXCu|\q  
     continue; J^"_H:1[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VESvCei  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z.${WZW  
   } D*.3]3-I  
  } s4Ja y!A  
 } X0j\nXk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !8p>4|VM  
} >9w^C1"  
s $(%]~P  
BOOL InitHotkey() nDn+lWA=g  
{ S*Ea" vBA  
 if(hHook!=NULL){ jZIT[HM  
  nHookCount++; tM5(&cQ!d  
  return TRUE; wQ(DX!   
 } ~ T}D#}  
 else C 9%bD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 54z`KX 73  
  if(hHook!=NULL) f?Ex$gnI  
   nHookCount++; Ps0 Cc_  
  return (hHook!=NULL); UW":&`i  
} 0faf4LzU!  
BOOL UnInit() ky !Z JR  
{ 5{-Hg[+9  
 if(nHookCount>1){ E `N`  
  nHookCount--; igOX0  
  return TRUE; ]9 @4P$I  
 } Wda?$3!^q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); N_D=j 6B  
 if(unhooked==TRUE){ G,A?yM'Vw  
  nHookCount=0; 70avr)OM  
  hHook=NULL; e|A=sCN-  
 } Rq1 5AR  
 return unhooked; -)J*(7F(6^  
} p!DdX  
tqA-X[^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6+sz4  
{ '!X`X=  
 BOOL bAdded=FALSE; U-?r>K2  
 for(int index=0;index<MAX_KEY;index++){ VIWH~UR)&!  
  if(hCallWnd[index]==0){ :SFf}  
   hCallWnd[index]=hWnd; \.P'8As  
   HotKey[index]=cKey; :qXREF@h  
   HotKeyMask[index]=cMask; _u-tRHh|A  
   bAdded=TRUE; #5;4O{  
   KeyCount++; (|W6p%(  
   break; !/2kJOSp  
  } M|{KQ3q:9  
 } $LR~c)}1I  
 return bAdded; ,DKW_F|  
} s/?(G L+Ae  
U&kdR+dB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #;2mP6a[  
{ 9Lt3^MKa"  
 BOOL bRemoved=FALSE; ;).QhHeg>  
 for(int index=0;index<MAX_KEY;index++){ 9MRe?  
  if(hCallWnd[index]==hWnd){ #r&yH^-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^-# :T  
    hCallWnd[index]=NULL; p<a~L~xH6  
    HotKey[index]=0; 1g!%ej jd  
    HotKeyMask[index]=0; k<*1mS8  
    bRemoved=TRUE; -J!k|GK#MX  
    KeyCount--; qB3& F pgW  
    break; TGPdi5Eq  
   } 78z/D|{"  
  } 2\}6b4  
 } p'SY 2xq-,  
 return bRemoved; +Y~,1ai 5^  
} h 7\EN  
Y%rC\Ij/i  
void VerifyWindow() 6mrfkYK  
{ am WIA`n=  
 for(int i=0;i<MAX_KEY;i++){ #5kg3OO  
  if(hCallWnd!=NULL){ cRPy5['E  
   if(!IsWindow(hCallWnd)){ 5[qx5|O  
    hCallWnd=NULL; l$p"%5 ]_  
    HotKey=0; 2L2)``*   
    HotKeyMask=0; =dC5q{  
    KeyCount--; M\9p-%"L  
   }  - zEQ/6  
  } z2V_nkI  
 } -/qu."9(B  
} \h/aD1 &g  
x:Tm4V{  
BOOL CHookApp::InitInstance() tdRnRoB  
{ 0j~C6 vp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); T xwZ3E  
 hins=AfxGetInstanceHandle(); R75np^  
 InitHotkey(); b!|c:mE9|  
 return CWinApp::InitInstance(); G0h7MO%x  
} ;-sF%c  
;lo!o9`<  
int CHookApp::ExitInstance() ;,]Wtmu)7  
{ B1gBvss  
 VerifyWindow(); 5SY(:!  
 UnInit(); G&*2h2,]  
 return CWinApp::ExitInstance(); =:=uV0jX\  
} ?\Jl] {i2  
<yrl_vl{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ygp NMq#?X  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "(d7:!%  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VSt)~  
#if _MSC_VER > 1000 O%kX=6  
#pragma once /e}NZo{)g  
#endif // _MSC_VER > 1000 MkG*6A  
F .JvMy3  
class CCaptureDlg : public CDialog ',p`B-dw  
{ 1e#}+i!a  
 // Construction 3"hPplE  
 public: qMe$Qr8  
  BOOL bTray; (a i&v  
  BOOL bRegistered; }A%Sx!7~  
  BOOL RegisterHotkey(); T/&4lJ^2l^  
  UCHAR cKey; H?>R#Ds-  
  UCHAR cMask;  + >oA@z  
  void DeleteIcon(); x;Jy-hMNl  
  void AddIcon(); ^i^/d#  
  UINT nCount; zj^Ys`nl  
  void SaveBmp(); LMrb 1lg$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <x),HTJ  
  // Dialog Data N?h=Zl|  
  //{{AFX_DATA(CCaptureDlg) PSQ5/l?\>  
  enum { IDD = IDD_CAPTURE_DIALOG }; PI#xRKt  
  CComboBox m_Key; 1/YWDxo,  
  BOOL m_bControl; l(@UpV-  
  BOOL m_bAlt; RS~jHwIh  
  BOOL m_bShift; ~% QVjzMC  
  CString m_Path; N(W ;(7  
  CString m_Number;  # xS8  
  //}}AFX_DATA [ENm(e$sI  
  // ClassWizard generated virtual function overrides  T^ ^o  
  //{{AFX_VIRTUAL(CCaptureDlg) >?q()>l  
 public: uf (`I  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Wej8YF@  
 protected: eEIa=MB*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $4y;F]  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); d([NU;  
  //}}AFX_VIRTUAL CCOd4  
  // Implementation r(IQ)\GR  
 protected: `)FSJV1  
  HICON m_hIcon; |>(;gr/5(  
  // Generated message map functions 7c9-MP)  
  //{{AFX_MSG(CCaptureDlg) O<Rm9tZ8  
  virtual BOOL OnInitDialog(); `Pv[A  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0Kxc$c  
  afx_msg void OnPaint(); t8,s]I&  
  afx_msg HCURSOR OnQueryDragIcon(); Tp&03  
  virtual void OnCancel(); jemg#GB8  
  afx_msg void OnAbout(); z!quA7s<]  
  afx_msg void OnBrowse(); b/='M`D}#G  
  afx_msg void OnChange(); r<38; a  
 //}}AFX_MSG FV>LD% uu  
 DECLARE_MESSAGE_MAP() |T~C($9  
}; ({g7{tUy^H  
#endif ,c#=qb8""  
~{hcJ:bI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @sRUl ,M;Z  
#include "stdafx.h" 4i>sOP3 B  
#include "Capture.h" #y }{ 'rF?  
#include "CaptureDlg.h" /(Se:jH$>  
#include <windowsx.h> z{w!yMp"  
#pragma comment(lib,"hook.lib") vkWh2z  
#ifdef _DEBUG $bRakF1'S  
#define new DEBUG_NEW &o>ctf.x  
#undef THIS_FILE mrR~[533j  
static char THIS_FILE[] = __FILE__; 48JD >=@7  
#endif A` x_M!m  
#define IDM_SHELL WM_USER+1 <\< [J0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yES+0D5<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XS5*=hv:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I;]Q}SUsm  
class CAboutDlg : public CDialog \M-}(>Pfk  
{ u/3[6MIp  
 public: ?YzOA${  
  CAboutDlg(); 5|>FM&  
  // Dialog Data M}|<# i7u  
  //{{AFX_DATA(CAboutDlg) Fp52 |w_  
  enum { IDD = IDD_ABOUTBOX }; zi7,?bD  
  //}}AFX_DATA <u2rb6  
  // ClassWizard generated virtual function overrides E_-3G<rt  
  //{{AFX_VIRTUAL(CAboutDlg) B2\R#&X.  
 protected: V3 j1M?>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5 Z+2  
  //}}AFX_VIRTUAL jU\vg;nr  
  // Implementation 7p'L(dq  
 protected: ?}4 =A&][  
  //{{AFX_MSG(CAboutDlg) ))Ws{  
  //}}AFX_MSG d7 )&Z:  
  DECLARE_MESSAGE_MAP() 8zv=@`4@G  
}; #-b0U[,.  
J ik+t\A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /[Oo*}Dc=F  
{ 9aYDi)  
 //{{AFX_DATA_INIT(CAboutDlg) %Q9 iR5?  
 //}}AFX_DATA_INIT y5;l?v94  
} ~Pq(Ta  
`NIc*B4q.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t?J Y@hT*  
{ r[>4b}4s  
 CDialog::DoDataExchange(pDX); 1<Fh aK  
 //{{AFX_DATA_MAP(CAboutDlg) . C_\xb  
 //}}AFX_DATA_MAP |3\$\qa  
} ?' F>DN  
/">A3bq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2,.%]U  
 //{{AFX_MSG_MAP(CAboutDlg) `uRf*-   
 // No message handlers VO"f=gFg  
 //}}AFX_MSG_MAP =Kdd+g!  
END_MESSAGE_MAP() 3m1]Ia -9  
Y@WCp  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) XEd|<+P1  
: CDialog(CCaptureDlg::IDD, pParent) b"x[+&%i  
{ DoV<p?U  
 //{{AFX_DATA_INIT(CCaptureDlg) 1 o5DQ'~n  
  m_bControl = FALSE; .O9 A[s<  
  m_bAlt = FALSE; vwZd@%BO  
  m_bShift = FALSE; qkX}pQkG)h  
  m_Path = _T("c:\\"); BzFD_A>j;_  
  m_Number = _T("0 picture captured."); sDV*k4  
  nCount=0; 4 I}xygV  
  bRegistered=FALSE; .;6G?8`  
  bTray=FALSE; 0:K4,  
 //}}AFX_DATA_INIT eM)E3~K:2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 CV <@Rgoa  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); rTJv>Jjld  
} _H#l&bL@C  
bJ8~/d]+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *ml&}9  
{ K*&?+_v :  
 CDialog::DoDataExchange(pDX); I W_:nm6  
 //{{AFX_DATA_MAP(CCaptureDlg) 9A]XuPAlh  
  DDX_Control(pDX, IDC_KEY, m_Key); ![H!Y W'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~'/I[y4t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ;1Kxqp z_i  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0(9]m)e  
  DDX_Text(pDX, IDC_PATH, m_Path); [.e Y xZ{=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;9cBlthh  
 //}}AFX_DATA_MAP 9T*%CI  
} A=X2zm>9  
ag6hhkj A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  *,9.Bx*  
//{{AFX_MSG_MAP(CCaptureDlg) (n{sp  
 ON_WM_SYSCOMMAND() $"Oy }  
 ON_WM_PAINT() B7Um G)C  
 ON_WM_QUERYDRAGICON() A:"J&TbBx  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wEK@B&DV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ed/@&52z0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) G@Dw  
//}}AFX_MSG_MAP Y =3:Q%X  
END_MESSAGE_MAP() @Kri)U i  
Qi^MfHW  
BOOL CCaptureDlg::OnInitDialog() 06bl$%  
{ M%7H-^{  
 CDialog::OnInitDialog(); HF-Msu6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NEQcEUd?  
 ASSERT(IDM_ABOUTBOX < 0xF000); SEY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *VT@  
 if (pSysMenu != NULL) H[%F o  
 { sY,!Ir`/`  
  CString strAboutMenu; 3mn0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7p}G!]`  
  if (!strAboutMenu.IsEmpty()) zOq~?>Ms6  
  { R<mLG $  
   pSysMenu->AppendMenu(MF_SEPARATOR); }+`W[h&u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {+[~;ISL  
  } 3nBbPP_  
 } v8Ncquv  
 SetIcon(m_hIcon, TRUE); // Set big icon RVfRGc^lK  
 SetIcon(m_hIcon, FALSE); // Set small icon =y7]9SOq  
 m_Key.SetCurSel(0); 1W;3pN  
 RegisterHotkey(); k>{i_`*  
 CMenu* pMenu=GetSystemMenu(FALSE); my")/e  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a<Pi J?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *Kt7"J  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _u}v(!PI  
 return TRUE; // return TRUE unless you set the focus to a control 6__@?XzJ  
} MAR kTxzi  
$XFG1?L!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `<t{NJ&f  
{ [p@NzS/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }M/w 0U0o  
 { h_]3L/  
  CAboutDlg dlgAbout; +nd'Uf   
  dlgAbout.DoModal(); iyOd&|.  
 } nx=#QLi  
 else K_`*ZV{r  
 { 6u7 (}K  
  CDialog::OnSysCommand(nID, lParam); <-Q0WP_^  
 } z$G?J+?J  
} W _b $E =  
|]A{8BBC  
void CCaptureDlg::OnPaint() sNvT0  
{ g)$Pvfc  
 if (IsIconic()) EyNI]XEj  
 { h9+ylHW_cp  
  CPaintDC dc(this); // device context for painting g8XGZW!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QVn0!R{  
  // Center icon in client rectangle 5F2+o#*h  
  int cxIcon = GetSystemMetrics(SM_CXICON); X 3L9j(  
  int cyIcon = GetSystemMetrics(SM_CYICON); 3N+P~v)T'  
  CRect rect; Z55,S=i  
  GetClientRect(&rect); eiEZtu  
  int x = (rect.Width() - cxIcon + 1) / 2; +7 F7Kh  
  int y = (rect.Height() - cyIcon + 1) / 2; U_}$QW0'  
  // Draw the icon CI{]o&Tf  
  dc.DrawIcon(x, y, m_hIcon); ";s5It  
 } .?I!/;=[  
 else Wlg(z%  
 { Sa,N1r  
  CDialog::OnPaint(); =_":Z!_  
 } +crAkb}i  
} WKah$l  
2)j\Lg_M  
HCURSOR CCaptureDlg::OnQueryDragIcon() iLmU|jdE  
{ ys#M* {?  
 return (HCURSOR) m_hIcon; f{AgKW9"  
} ;g*X.d  
tMAa$XrZj  
void CCaptureDlg::OnCancel() /kw4":{]  
{ Z}NAH`V`:+  
 if(bTray) &]LwK5SR  
  DeleteIcon(); ~5!ukGK_  
  CDialog::OnCancel(); {t=Nnc15K  
} A^K,[8VX  
+W;B8^imG  
void CCaptureDlg::OnAbout() _23sIUN c3  
{ ,O[vxN1X*  
 CAboutDlg dlg; mr('zpkRq  
 dlg.DoModal(); }MIH{CMH  
} 5z]dA~;*2  
$AXz/fGV  
void CCaptureDlg::OnBrowse() y:42H tS  
{ tLvli>y@  
 CString str; z!3Z^d`  
 BROWSEINFO bi; wP8R=T  
 char name[MAX_PATH];  Nl_;l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); M:I,j  
 bi.hwndOwner=GetSafeHwnd(); :mJM=FeJ  
 bi.pszDisplayName=name; :jUuw:\  
 bi.lpszTitle="Select folder"; H]-W$V   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; aDOH3Ri0K!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =TP>Y"  
 if(idl==NULL) P9>C!0 -x  
  return; z5vryhX_Z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); UpIf t=@P  
 str.ReleaseBuffer(); WuNu}Ibl}m  
 m_Path=str; {30<Vc=  
 if(str.GetAt(str.GetLength()-1)!='\\') f.f4<_v'h  
  m_Path+="\\"; ]bR'J\Fwl  
 UpdateData(FALSE); FRg6-G/S  
} +[qkG. O  
E, v1F!  
void CCaptureDlg::SaveBmp() 7 %|>7  
{ UF%5/SiVX  
 CDC dc; X3-1)|g !z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); x$Oz0[  
 CBitmap bm; UA9LI<Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); {+[gf:Ev  
 int Height=GetSystemMetrics(SM_CYSCREEN);  vXvV5Oq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -J30g\  
 CDC tdc; O.E0LCABC  
 tdc.CreateCompatibleDC(&dc); Y{yr-E #~M  
 CBitmap*pOld=tdc.SelectObject(&bm); q kKABow  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GMNb;D(>K  
 tdc.SelectObject(pOld); 6,)y{/ENC  
 BITMAP btm; c[y8"M5  
 bm.GetBitmap(&btm); &\H5*A.HkA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; OL'=a|g|c  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2|=_kN8;  
 BITMAPINFOHEADER bih; 0?7uqS#L  
 bih.biBitCount=btm.bmBitsPixel; d0=nAZZ  
 bih.biClrImportant=0; "qsNySI  
 bih.biClrUsed=0; 3k<#;(  
 bih.biCompression=0; (=/F=,w   
 bih.biHeight=btm.bmHeight; ,$]q2aL  
 bih.biPlanes=1; 16>uD;G  
 bih.biSize=sizeof(BITMAPINFOHEADER); p~.@8r(  
 bih.biSizeImage=size; 3XnXQ/({  
 bih.biWidth=btm.bmWidth; SRTpE,  
 bih.biXPelsPerMeter=0; BQU5[8l  
 bih.biYPelsPerMeter=0; l(5-Cr  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z~ H Gc"~  
 static int filecount=0; KVR}Tp/R  
 CString name; (<l2 ^H  
 name.Format("pict%04d.bmp",filecount++); ]#$kA9  
 name=m_Path+name; %5G BMMn  
 BITMAPFILEHEADER bfh; XNU qZ-M :  
 bfh.bfReserved1=bfh.bfReserved2=0; 4I-p/&Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); R`Lm"5w  
 bfh.bfSize=54+size; iy]}1((hR  
 bfh.bfOffBits=54; L0kNt &di  
 CFile bf; {h"\JI!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ JF*g!sV%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); BFO Fes`>~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }$U[5wL,_  
  bf.WriteHuge(lpData,size); ]M(mq`K  
  bf.Close(); \.c )^QQ  
  nCount++; zy[=OX+  
 } n@;x!c< +  
 GlobalFreePtr(lpData); 'pY;]^M  
 if(nCount==1) `yAo3A9vk  
  m_Number.Format("%d picture captured.",nCount); @MB _gt)7?  
 else dz|*n'd  
  m_Number.Format("%d pictures captured.",nCount); @;fE%N  
  UpdateData(FALSE); />Vx*^u8Hz  
} ~ n^G<iXLp  
R2aK5~   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,-3(^d\1F  
{ f_!`~`04  
 if(pMsg -> message == WM_KEYDOWN) 6I.mc  
 { 1=Zw=ufqV  
  if(pMsg -> wParam == VK_ESCAPE) mRH]'d lD7  
   return TRUE; y8vH?^:%<  
  if(pMsg -> wParam == VK_RETURN) V;-.38py  
   return TRUE; Sz|CreFK16  
 } }t2pIkF;  
 return CDialog::PreTranslateMessage(pMsg); P! Ed  
} bH/pa#G(  
2 dD<]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g]<Z]R`  
{ p=+*g.,O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "&#W Mi  
  SaveBmp(); 0BB @E(*  
  return FALSE; D}/=\J/  
} P5}[*k%DQw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [A9 ,!YY  
 CMenu pop; oPu|Q^I=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); a\69,%!:  
 CMenu*pMenu=pop.GetSubMenu(0); 0r-lb[n8i  
 pMenu->SetDefaultItem(ID_EXITICON); G 0QXf  
 CPoint pt; GoSWH2N  
 GetCursorPos(&pt); ?4>y2!OC9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); QHzX 5$IM  
 if(id==ID_EXITICON) I0HY#z%  
  DeleteIcon(); j]B $(pt  
 else if(id==ID_EXIT) {QS@Ugf  
  OnCancel(); mu6xL QdA  
 return FALSE; 3.<6;?  
} aY[0A_  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R_Gq8t$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4 ?@uF[  
 AddIcon(); JNFT6T)T15  
 return res; "26B4*  
} 6Sb'Otw.  
]v@tZ}  
void CCaptureDlg::AddIcon()  6I cM:x  
{ 3 2 1={\X  
 NOTIFYICONDATA data; OHP3T(Q5  
 data.cbSize=sizeof(NOTIFYICONDATA); +/3 Z  
 CString tip; /y](mu"!  
 tip.LoadString(IDS_ICONTIP); *mQDS.'AB@  
 data.hIcon=GetIcon(0); K_&c5(-(_  
 data.hWnd=GetSafeHwnd(); dx13vZ3[U  
 strcpy(data.szTip,tip); <Id1:  
 data.uCallbackMessage=IDM_SHELL; \Qi#'c$5+a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nrS[7~  
 data.uID=98; *K}z@a_  
 Shell_NotifyIcon(NIM_ADD,&data); {wp Mg  
 ShowWindow(SW_HIDE); c#n4zdQd]5  
 bTray=TRUE; Tw}?(\ya  
}  &6\r  
KO-Zz&2f  
void CCaptureDlg::DeleteIcon() oBRm\8 2|  
{ z<o E!1St  
 NOTIFYICONDATA data; Th~3mf #  
 data.cbSize=sizeof(NOTIFYICONDATA); d(X\B{  
 data.hWnd=GetSafeHwnd(); =wIdC3Ph  
 data.uID=98; )4!CR/ao  
 Shell_NotifyIcon(NIM_DELETE,&data); d^Zo35X  
 ShowWindow(SW_SHOW); *h*j%  
 SetForegroundWindow(); uv|eVT3jNs  
 ShowWindow(SW_SHOWNORMAL); _Sly7_  
 bTray=FALSE; ^I(oy.6?=p  
} I 9{40_  
:$M9XZ~\  
void CCaptureDlg::OnChange() $ ] W[y=  
{ U^[cYTG  
 RegisterHotkey(); `P^u:  
} DnNt@e2|  
Gg=aK~q6  
BOOL CCaptureDlg::RegisterHotkey() 4;BW  
{ %w'/n>]j  
 UpdateData(); io9y; S"+  
 UCHAR mask=0; ;g: UE  
 UCHAR key=0; _l24Ba$F6  
 if(m_bControl) t4f (Y,v  
  mask|=4; KjFZ  
 if(m_bAlt) f$1Gu  
  mask|=2; C<[d  
 if(m_bShift) t(J![wB}  
  mask|=1; q Z8|B  
  key=Key_Table[m_Key.GetCurSel()]; Jh37pI  
 if(bRegistered){ C6K|:IK{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ne &Xf  
  bRegistered=FALSE; 1.Haf  
 } pT("2:)x  
 cMask=mask; H!unIy|  
 cKey=key; ]$m#1Kj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); cr76cYq"Q  
 return bRegistered; @T<ad7g-2J  
} RDUT3H6~  
- *:p.(c  
  四、小结 X|X4L(i  
|RR"'o_E  
  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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