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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: K+$c,1wb  
  H62*8y8  
  一、实现方法 2nie I*[  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: yEqmB4^-  
yaR;  
#pragma data_seg("shareddata") V= *J9~K  
HHOOK hHook =NULL; //钩子句柄 -5 W0K}  
UINT nHookCount =0; //挂接的程序数目 kL|Y-(FPo%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qRGb3l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C[&&.w8Pm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v_@_J!s  
static int KeyCount =0; 6uXYZ.A  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :d2u?+F  
#pragma data_seg() KE&}*Nf[  
qtH&]Suu,  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 pz IMj_  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: omA*XXUx=8  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G\p; bUF  
cKey,UCHAR cMask) CzEn_ZMb  
{ Mqtp}<*@-  
 BOOL bAdded=FALSE; +r!h*4  
 for(int index=0;index<MAX_KEY;index++){ ?W|IC8~d')  
  if(hCallWnd[index]==0){ MHYf8HN  
   hCallWnd[index]=hWnd; 2,;t%GB  
   HotKey[index]=cKey; !Cy2>6v7  
   HotKeyMask[index]=cMask; *pD;AU  
   bAdded=TRUE; `^ _:  
   KeyCount++; @Kr)$F  
   break; D)sEAfvX  
  } `s_TY%&_}g  
 } QMxz@HGa|  
 return bAdded; a*[\edcHU  
} e d*AU,^@v  
//删除热键 X[~CLKH(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UQcmHZ+lf  
{ V6{xX0'b*m  
 BOOL bRemoved=FALSE; =|%T E   
 for(int index=0;index<MAX_KEY;index++){ W7o/  
  if(hCallWnd[index]==hWnd){ {|E7N"Qzg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ui{_w @o  
    hCallWnd[index]=NULL; {LD8ie|x1`  
    HotKey[index]=0; KTEis!w  
    HotKeyMask[index]=0; VT7NWT J,  
    bRemoved=TRUE; "'#Hh&Us  
    KeyCount--; &Kp+8D*  
    break; U}0/V c26  
   } DS2$w9!  
  } JrAc]=  
 } @#tSx  
 return bRemoved; T_Y}1n|7[  
} {@$3bQ  
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  DLL中的钩子函数如下: -*M:OF"Zh  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m^.C(}  
{ %p60pn[(  
 BOOL bProcessed=FALSE; 1F,_L}=o1s  
 if(HC_ACTION==nCode) y21uvp'  
 { 2AW{qwk7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 q_&IZ,{Vk  
   switch(wParam) Vgn1I(Gj4  
   {  ZRm\d3x4  
    case VK_MENU: 3p W MS&  
     MaskBits&=~ALTBIT; AZy2Pu56  
     break; []0~9,u  
    case VK_CONTROL: :a@z53X@M  
     MaskBits&=~CTRLBIT; $SVGpEw  
     break; )+,jal^7  
    case VK_SHIFT: 9`{2h$U  
     MaskBits&=~SHIFTBIT; 8w[EyVHA  
     break; 9Ol_z\5  
    default: //judge the key and send message CM1a<bV<  
     break; *KH@u  
   } eBIR *TZ):  
   for(int index=0;index<MAX_KEY;index++){ "%t`I)  
    if(hCallWnd[index]==NULL) r_E)HL/A  
     continue; U.'@S8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n;`L5  
    { 5z ^UQ q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9%14k  
     bProcessed=TRUE; ~{G: ,|`  
    } c.Z4f 7  
   } 9lJj/  
  } \=_q{  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^(*O$N*#  
   switch(wParam) )6 <byO  
   { !cwVJe  
    case VK_MENU: W? ||9  
     MaskBits|=ALTBIT; S5KYZ W  
     break; _l=  
    case VK_CONTROL: ;w(1Ydo  
     MaskBits|=CTRLBIT; z xUj1  
     break; jsd]7C  
    case VK_SHIFT: 'a^tL[rLP1  
     MaskBits|=SHIFTBIT; =Fy8rTdk6r  
     break; 8I0T u  
    default: //judge the key and send message otD?J= B  
     break; *yq]  
   } zn1Rou]6  
   for(int index=0;index<MAX_KEY;index++){ qU*&49X  
    if(hCallWnd[index]==NULL) ]\,uF8gg)  
     continue; UH-uU~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s[@>uP  
    { 2\B9o `Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A=d$ir K[  
     bProcessed=TRUE; n o+tVm|  
    } )2Ru!l#  
   } S} Cp&}G{P  
  } R 0HVLQI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .]s( c!{y  
   for(int index=0;index<MAX_KEY;index++){ 2 RUR=%C  
    if(hCallWnd[index]==NULL) EvQwGt1)P  
     continue; ZNpExfGEU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yPh2P5}H>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ca@=s  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QsJW"4d  
   } 'F"Y?y:!  
  } RrdtU7i3  
 } 0/@ X!|X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xTFrrmxOf  
} tK}p05nPhl  
7Ljj#!`lUp  
  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: =/JF-#n/MA  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _pko]F|()  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {hRie+  
,,gLrV k  
  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: vF6*c  
J2< QAX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q6JW@GT  
{ Xu94v{u3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DwY<qNWT  
 { X0Z-1bs  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wEnuUC4j  
  SaveBmp(); O0wCb  
  return FALSE; ?t0zsq  
 } tG2OVRx8u  
 …… //其它处理及默认处理 ' q<EZ {  
} \btR^;_\A  
#>m, Cm  
 ;[KriW  
  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。 `o8{qU,*]N  
=6Sj}/   
  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。 Wd` QpW  
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  二、编程步骤 Xvj=*wg\Y  
f UF;SqT  
  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"; r ctSS:1  
s |gD  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; u2-@?yt  
nz(q)"A  
  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; A` o?+2s_  
;j>Vt?:Pw  
  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; v=.z|QD^1  
grCO-S|j^  
  5、 添加代码,编译运行程序。 (!VMnLlXRK  
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三、程序代码 Xm8Z+}i  
I51oG:6fR?  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @bW[J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v-;XyVx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \%Ah^U)gS  
#if _MSC_VER > 1000 rI<nUy P?  
#pragma once ?wLdW1&PpX  
#endif // _MSC_VER > 1000 c/=y*2,zo  
#ifndef __AFXWIN_H__ Y0PGT5].@'  
#error include 'stdafx.h' before including this file for PCH 9jMC |oE  
#endif  H\=LE  
#include "resource.h" // main symbols LGo2^Xx  
class CHookApp : public CWinApp cNuHXaWp  
{ k~1j/VHv  
 public: oT|P1t.  
  CHookApp(); p`ADro*  
  // Overrides S?Bc~y  
  // ClassWizard generated virtual function overrides lP@)   
  //{{AFX_VIRTUAL(CHookApp) C,{F0-D  
 public: xA&  
  virtual BOOL InitInstance(); Cgz&@@j,]  
  virtual int ExitInstance(); :J Gl>V  
  //}}AFX_VIRTUAL [Y22Wi  
  //{{AFX_MSG(CHookApp) 5>ADw3z'  
  // NOTE - the ClassWizard will add and remove member functions here. 0Oc}rRH(C  
  // DO NOT EDIT what you see in these blocks of generated code ! >lraYMc<rZ  
  //}}AFX_MSG ` y^zM/Ib  
  DECLARE_MESSAGE_MAP() _oJ2]f6KX  
}; X`fhln9N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [;?"R-V"z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JFG",09]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f`hyYp`d5  
BOOL InitHotkey(); egI{!bZg'\  
BOOL UnInit(); ,pyQP^u-  
#endif iY ^{wi~?  
1m>^{u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. I%}L@fZ  
#include "stdafx.h" <AI>8j6#B  
#include "hook.h" v}F4R $  
#include <windowsx.h> &gGs) $f[  
#ifdef _DEBUG 7_Ba3+9jpa  
#define new DEBUG_NEW ='dLsh4P2N  
#undef THIS_FILE 3:[!t%Yb  
static char THIS_FILE[] = __FILE__; YVB% kKv{  
#endif (px*R~}  
#define MAX_KEY 100 Sc&)~h}YF  
#define CTRLBIT 0x04 lx{.H,1~  
#define ALTBIT 0x02 &GdL 9!hH  
#define SHIFTBIT 0x01 r]k*7PK  
#pragma data_seg("shareddata") B*?ZE4`  
HHOOK hHook =NULL; Hva2j<h  
UINT nHookCount =0; &l. x:eD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y$IaXr5L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (O8,zqP9l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L!;^ #g  
static int KeyCount =0; y#S1c)vU  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift M!N` Orz  
#pragma data_seg() 6IEUJ-M Z  
HINSTANCE hins; ycgfZ 3K  
void VerifyWindow(); L]k*QIn:h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `OKo=e~,  
//{{AFX_MSG_MAP(CHookApp) CN.6E<9'kK  
// NOTE - the ClassWizard will add and remove mapping macros here. e7@li<3>d  
// DO NOT EDIT what you see in these blocks of generated code! %{R _^Y8t  
//}}AFX_MSG_MAP p`>AnfG  
END_MESSAGE_MAP() 3<c*v/L{C\  
ow2M,KU6Z  
CHookApp::CHookApp() 6xQ"bFm  
{ \#PP8  
 // TODO: add construction code here, B/jrYT$;m  
 // Place all significant initialization in InitInstance Ln ~4mN^  
} 0TTIaa$  
DpA\r_D  
CHookApp theApp; f%2%T'Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hzaLx8L  
{ 9;=q=O/  
 BOOL bProcessed=FALSE; U r^YG4(  
 if(HC_ACTION==nCode) 9[z'/ U.Bn  
 { /@&(P#h  
  if((lParam&0xc0000000)==0xc0000000){// Key up `$J'UXtGc  
   switch(wParam) /^w"' '  
   { I+0c8T(:  
    case VK_MENU: 3PfiQ|/b  
     MaskBits&=~ALTBIT; B ,V( LTE  
     break; +.w[6  
    case VK_CONTROL: 8)N0S% B  
     MaskBits&=~CTRLBIT; c#=&!FRe  
     break; X(IyvfC  
    case VK_SHIFT: D899gGe  
     MaskBits&=~SHIFTBIT; 43KaL(  
     break; FyCBN tCv  
    default: //judge the key and send message e\`wlaP,  
     break; [ L  
   } p` $fTgm  
   for(int index=0;index<MAX_KEY;index++){ Iq+2mQi*/k  
    if(hCallWnd[index]==NULL) I?^aCnU  
     continue; &a.']!$^"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !?jK1{E3  
    { +<&E3Or  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nt7|f,_J  
     bProcessed=TRUE; P"b8!k?  
    } d>Un J)V}  
   } R0{Qy*YQ`  
  } V]Sgx00;  
  else if((lParam&0xc000ffff)==1){ //Key down ze&#i6S  
   switch(wParam) vruD U#  
   { 5`"iq "5Cf  
    case VK_MENU: Qe_+r(3)k  
     MaskBits|=ALTBIT; R6 ;jY/*#  
     break; \fTTkpM  
    case VK_CONTROL: "c6<zP  
     MaskBits|=CTRLBIT; a_Jb> }  
     break; 8+ov(B;(  
    case VK_SHIFT: 22z1g(; @  
     MaskBits|=SHIFTBIT; DacN {r"3  
     break; >E, Q  
    default: //judge the key and send message yX`#s]M  
     break; 1DUb [W8  
   } q]K'p,'  
   for(int index=0;index<MAX_KEY;index++) "rsSW 3_  
   { n!ZMTcK8  
    if(hCallWnd[index]==NULL) ^ESUMXb  
     continue; K!p,x;YX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R }1W  
    { . @@an;C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +,z) #  
     bProcessed=TRUE; $%=G[/i'  
    } / $_M@>  
   } tj[c#@[B  
  } Apmw6cc  
  if(!bProcessed){ K U $`!h  
   for(int index=0;index<MAX_KEY;index++){ SyAo, )j  
    if(hCallWnd[index]==NULL) E4=qh1d  
     continue; n&$/Q$d&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z?4=h Sy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4Ac}(N5D@  
   } > VP5vkv=  
  } b:1 L@8s;  
 } /[%w*v*'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); okstY4f'  
} ?pqU3-knH  
cAb>2]M5V  
BOOL InitHotkey() q4/909x=  
{ UA0F):  
 if(hHook!=NULL){ a fx'  
  nHookCount++; 4@h;5   
  return TRUE; gX^ PSsp  
 } %&h c"7/k  
 else J#''q"rZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W&YU^&`Yr  
  if(hHook!=NULL) _lX8K:C(  
   nHookCount++; ALXTR%f  
  return (hHook!=NULL); zW5C1:.3K  
} b1xpz1  
BOOL UnInit() &))\2pl  
{ |NJ}F@t/5  
 if(nHookCount>1){ vQgq]mA?  
  nHookCount--; w^Ag]HZN  
  return TRUE; 6Hk="$6K  
 } ~>g+2]Bn>$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); hO \/  
 if(unhooked==TRUE){ s1 bU  
  nHookCount=0; hO3 {  
  hHook=NULL; Wo!;K|~P  
 } u h )o  
 return unhooked; CW p#^1F  
} 1'Rmg\(  
[9AM\n>g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F?BS717qS%  
{ <( EyXV  
 BOOL bAdded=FALSE; 6e.[,-eU  
 for(int index=0;index<MAX_KEY;index++){ UFw](%=&M  
  if(hCallWnd[index]==0){ mlB~V3M'G  
   hCallWnd[index]=hWnd; YG`? o  
   HotKey[index]=cKey; KP{3iUqvO  
   HotKeyMask[index]=cMask; y3JMbl[S0  
   bAdded=TRUE; Ac`;st%l.  
   KeyCount++; {$33B'wk  
   break; ^_W40/c3  
  } >g}G}=R~3  
 } 6pp$-uS  
 return bAdded; S)7/0N79A  
} ix&'0IrX*  
lP3h<j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) orqJ[!u)`  
{ y' [LNp V  
 BOOL bRemoved=FALSE; cU8xUpq  
 for(int index=0;index<MAX_KEY;index++){ ||Y<f *  
  if(hCallWnd[index]==hWnd){ Ryv_1gR!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S&wzB)#'  
    hCallWnd[index]=NULL; U\vY/6;JI  
    HotKey[index]=0; ` >U?v  
    HotKeyMask[index]=0; cG_Vc[  
    bRemoved=TRUE; >{nH v)  
    KeyCount--; rt}^4IqL  
    break; ?lKhzH.T  
   } G3a7`CD  
  } 5jZiJw(  
 } 1m)M;^_  
 return bRemoved; [>Fm [5x  
} _ck[&Q  
xaW{I7FfG  
void VerifyWindow() i=rH7k  
{ >2lwWXA  
 for(int i=0;i<MAX_KEY;i++){ +>tUz D  
  if(hCallWnd!=NULL){ Fr [7  
   if(!IsWindow(hCallWnd)){ ;gB`YNL  
    hCallWnd=NULL; yWb4Ify  
    HotKey=0; q-_' W,  
    HotKeyMask=0; Z a(|(M H  
    KeyCount--; 3CZS)  
   } z9 ($.  
  } uM S*(L_  
 } sn{tra  
} ?9xu{B>6  
y{=>$C[  
BOOL CHookApp::InitInstance() ZA820A>2!  
{ |5MbAqjzC  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `^6 ,kI-c  
 hins=AfxGetInstanceHandle(); @dEiVF`4:  
 InitHotkey(); 75NRCXh.  
 return CWinApp::InitInstance(); AK@L32-S  
} ."6[:MF  
<]d LX}C)  
int CHookApp::ExitInstance() E=w3=\JP  
{ nc?B6IV  
 VerifyWindow(); lm0N5(XP  
 UnInit(); Tv$sqVe9  
 return CWinApp::ExitInstance(); $[ z y  
} wT_h!W  
$kPHxD!"  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^3~e/PKM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^?GmrHC)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]l;*$2w)  
#if _MSC_VER > 1000 1[PMDS_X  
#pragma once a`c:`v2o  
#endif // _MSC_VER > 1000 $B .Qc!m  
|J>WC}g@n  
class CCaptureDlg : public CDialog s V  }+eU  
{ :dnJY%/q  
 // Construction bF-"tm  
 public: VaLs`q&3>  
  BOOL bTray; Qa4MZj ;$K  
  BOOL bRegistered; EgM*d)X  
  BOOL RegisterHotkey(); JL^2l$up  
  UCHAR cKey; ',=g;  
  UCHAR cMask; ~ 'Vxg}  
  void DeleteIcon(); C9~~O~7x  
  void AddIcon(); #Dy?GB08  
  UINT nCount; X#p Wyo~  
  void SaveBmp(); TqAPAHg  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor BmBz}:xMez  
  // Dialog Data )!W45"l-3M  
  //{{AFX_DATA(CCaptureDlg) CIC[1,  
  enum { IDD = IDD_CAPTURE_DIALOG }; Lx[ ,Z,kD  
  CComboBox m_Key; KZ:hKY@q  
  BOOL m_bControl; h<l1U'Bn7  
  BOOL m_bAlt; %,q. ),F  
  BOOL m_bShift; anN#5jt  
  CString m_Path; '%;\YD9  
  CString m_Number; #x@eDnb_  
  //}}AFX_DATA =Lp7{09u  
  // ClassWizard generated virtual function overrides 3$/ 4wH^  
  //{{AFX_VIRTUAL(CCaptureDlg) ~Y!kB:D5;~  
 public: MuI2?:~:*4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .*/Fucr  
 protected: nk=$B (h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \2e0|)aF6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  zGlZ!t:  
  //}}AFX_VIRTUAL 8Ogv9  
  // Implementation F -gE<<  
 protected: =;L*<I  
  HICON m_hIcon; {6Au3gt/  
  // Generated message map functions rofNZ;nu  
  //{{AFX_MSG(CCaptureDlg) q_fam,9  
  virtual BOOL OnInitDialog(); }JgYCsF/f  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7jG(<!,  
  afx_msg void OnPaint(); ROb\Rx m  
  afx_msg HCURSOR OnQueryDragIcon(); 19U]2D/z  
  virtual void OnCancel(); !{%:qQiA  
  afx_msg void OnAbout(); $jzFc!rs  
  afx_msg void OnBrowse(); hZ$t$3  
  afx_msg void OnChange(); dp5cDF}l  
 //}}AFX_MSG ku&k'V  
 DECLARE_MESSAGE_MAP() LlYTv% I  
}; 2I'~2o  
#endif gzn^#3b  
a2@c%i  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K7)kS  
#include "stdafx.h" &#{dWObh  
#include "Capture.h" Y3U9:VB  
#include "CaptureDlg.h"  H`QQG!  
#include <windowsx.h> D-p.kA3MJ  
#pragma comment(lib,"hook.lib") 5Rv+zQ#GR  
#ifdef _DEBUG N"7]R[*  
#define new DEBUG_NEW t0E51Ic@  
#undef THIS_FILE 0\QR!*'$  
static char THIS_FILE[] = __FILE__; ;{Ux_JEg  
#endif Kq6jw/T  
#define IDM_SHELL WM_USER+1 mI1H!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p*3; hGp6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Sv[5NZn0&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J$ut_N):N  
class CAboutDlg : public CDialog *ZCn8m:-+  
{ _2ef LjXQ  
 public: $.E6S<(h  
  CAboutDlg(); -G|a*^  
  // Dialog Data 9J-b6,  
  //{{AFX_DATA(CAboutDlg) %VNlXHO.  
  enum { IDD = IDD_ABOUTBOX }; 3`.P'Fh(k  
  //}}AFX_DATA 4@  3[  
  // ClassWizard generated virtual function overrides % ZU/x d  
  //{{AFX_VIRTUAL(CAboutDlg) 0#p/A^\#7M  
 protected: e]8,:Gd(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Am4lEvb  
  //}}AFX_VIRTUAL 6sfwlT  
  // Implementation oYM3Rgxf9Q  
 protected: hVpCB,  
  //{{AFX_MSG(CAboutDlg) TD@v9  
  //}}AFX_MSG :$3oFN*g  
  DECLARE_MESSAGE_MAP() WgQBGch,!  
}; rS XzBi{  
T]9\VW4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) es:2M |#O  
{ 6QQfQ,  
 //{{AFX_DATA_INIT(CAboutDlg) qCQ./"8  
 //}}AFX_DATA_INIT 15\Ph[6g  
} uZjC c M  
io2)1cE&f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R!\EK H  
{ .p` pG3  
 CDialog::DoDataExchange(pDX); u'~;Y.@i'  
 //{{AFX_DATA_MAP(CAboutDlg) 5`+5{p  
 //}}AFX_DATA_MAP ~%k?L4%  
} ~p1EF;4#  
X@2-*so<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _"a=8a06G  
 //{{AFX_MSG_MAP(CAboutDlg) pJIv+  
 // No message handlers 3(E $I5  
 //}}AFX_MSG_MAP (]2H7X:b  
END_MESSAGE_MAP() PXKJ^fa  
<cN~jv-w$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .x83Ah`  
: CDialog(CCaptureDlg::IDD, pParent) Pt,ebL~  
{ CB\{!  
 //{{AFX_DATA_INIT(CCaptureDlg) =3xE:  
  m_bControl = FALSE; QP@<)`1t9  
  m_bAlt = FALSE; iI1n2>V3y  
  m_bShift = FALSE; /u<nLj1  
  m_Path = _T("c:\\"); {}~:&.D  
  m_Number = _T("0 picture captured."); YvL?j  
  nCount=0; Aj>[z8!,  
  bRegistered=FALSE; }GwVKAjP  
  bTray=FALSE; Ka!I`Yf  
 //}}AFX_DATA_INIT I<oL}f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >`RRP}u=u  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ut@RGg+f8  
} >H][.@LyR  
\*T"M*;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) OR6ML- |  
{ jyS=!ydn+  
 CDialog::DoDataExchange(pDX); fK}h"iH+K  
 //{{AFX_DATA_MAP(CCaptureDlg) -Yi,_#3{  
  DDX_Control(pDX, IDC_KEY, m_Key); )Q;978:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); M)-6T{[IT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \ gwXH  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); J97R0  
  DDX_Text(pDX, IDC_PATH, m_Path); koG{ |elgB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]$-cMX  
 //}}AFX_DATA_MAP w&h 2y4  
} &7mW9]  
.1 )RW5|c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I5ss0JSl/  
//{{AFX_MSG_MAP(CCaptureDlg) LwqC ~N  
 ON_WM_SYSCOMMAND() 1 k8x%5p  
 ON_WM_PAINT() Pz_Oe,{.I  
 ON_WM_QUERYDRAGICON() /lhz],w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }Rvm &?~O  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sfT+i;p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,:n| ?7  
//}}AFX_MSG_MAP yY{kG2b,  
END_MESSAGE_MAP() 66&EBX}  
>zvY\{WY  
BOOL CCaptureDlg::OnInitDialog() IV16d  
{ RSfM]w}Hq#  
 CDialog::OnInitDialog(); Ji'(`9F&a  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F'P Qqb{  
 ASSERT(IDM_ABOUTBOX < 0xF000); >T3H qYX5W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G`h+l<  
 if (pSysMenu != NULL) 'vV$]/wBF  
 { x+5p1sv6  
  CString strAboutMenu; o?Nu:&yE  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +Lm4kA+aE5  
  if (!strAboutMenu.IsEmpty()) 'Ye v} QM  
  { `|O yRU"EK  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3k$[r$+"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2/P"7A=<  
  } t !`Jse>  
 } y7\"[<E`(V  
 SetIcon(m_hIcon, TRUE); // Set big icon Fqq6^um  
 SetIcon(m_hIcon, FALSE); // Set small icon nt1CTWKM8^  
 m_Key.SetCurSel(0);  v9RW5  
 RegisterHotkey(); 0BPMmk  
 CMenu* pMenu=GetSystemMenu(FALSE); IakKi4(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `g ''rfk}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9<E g}Ic  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mdih-u(T|  
 return TRUE; // return TRUE unless you set the focus to a control m4w ') r~  
} )emOKS  
t@oK~ Nr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `iKj  
{ l3o#@sz:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u0)7i.!M  
 { p0p4Xh1 e  
  CAboutDlg dlgAbout; 'XOX@UH d  
  dlgAbout.DoModal(); 8iQ[9  
 } Cr/`keR  
 else EOKzzX7 S  
 { faXx4A2"  
  CDialog::OnSysCommand(nID, lParam); Tpp&  
 } ?^#lWx q  
} 's x\P[a  
qOV[TP,  
void CCaptureDlg::OnPaint() ;Q0bT`/X  
{ =1;=  
 if (IsIconic()) 9W`Frx'h1  
 { NmIHYN3  
  CPaintDC dc(this); // device context for painting B6P|Z%E;D6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); V}w;Y?] J  
  // Center icon in client rectangle a T  l c  
  int cxIcon = GetSystemMetrics(SM_CXICON); :c[n\)U[aa  
  int cyIcon = GetSystemMetrics(SM_CYICON); uwIc963  
  CRect rect; uYG^Pc^v  
  GetClientRect(&rect); WP **a Bp  
  int x = (rect.Width() - cxIcon + 1) / 2; KLQTKMNv  
  int y = (rect.Height() - cyIcon + 1) / 2; B@v\eF;  
  // Draw the icon ,3DXFV'uxb  
  dc.DrawIcon(x, y, m_hIcon); Fig&&b a  
 } )u ?' ;  
 else O%!5<8Xrb  
 { u'A#%}3  
  CDialog::OnPaint(); 9a$56GnW1  
 } kdx y\ jA  
} 2 +5e0/_V  
ZUXr!v/R:1  
HCURSOR CCaptureDlg::OnQueryDragIcon() #%3rTU  
{ W1aa:hEf  
 return (HCURSOR) m_hIcon; C.  MoKa3  
} vC;]jJb:  
'BMy8  
void CCaptureDlg::OnCancel() %WFu<^jm  
{ S*)1|~pRvQ  
 if(bTray) n}-3o]ku  
  DeleteIcon(); 7B9`<{!h  
  CDialog::OnCancel(); >?W[PQ5yx  
} &Bb<4R  
@+,pN6}g  
void CCaptureDlg::OnAbout() L];y}]:F*  
{ DrW#v-d  
 CAboutDlg dlg; [|`U6 8}u  
 dlg.DoModal(); 0"k |H&  
} donw(_=  
bEuaOBc  
void CCaptureDlg::OnBrowse() R! s6% :Yg  
{ oSb, :^Wl  
 CString str; >n5:1.g  
 BROWSEINFO bi; ;)0w:Zn/[  
 char name[MAX_PATH]; PG5- ;i/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0pe3L   
 bi.hwndOwner=GetSafeHwnd(); +0z 7KO%^^  
 bi.pszDisplayName=name; d?,M/$h  
 bi.lpszTitle="Select folder"; :B *}^g  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; uUR~&8ERX  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); M<?Q4a'Q  
 if(idl==NULL) 2h30\/xkU  
  return; ?`?T7w|3 y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); JMBK{JK>  
 str.ReleaseBuffer(); 5wtTP ;P  
 m_Path=str; o@>? *=  
 if(str.GetAt(str.GetLength()-1)!='\\') ?@6b>='!  
  m_Path+="\\"; q(^Q3  
 UpdateData(FALSE); v *hRz;  
} .] 4W!])9  
em@EDMvI  
void CCaptureDlg::SaveBmp() jZfx Jm  
{ U$&hZ_A  
 CDC dc; iGXI6`F"  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `xS{0P{uj  
 CBitmap bm; t-%Q`V=[  
 int Width=GetSystemMetrics(SM_CXSCREEN); I{0 k  
 int Height=GetSystemMetrics(SM_CYSCREEN); n;XWMY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); I~eSZ?$s#  
 CDC tdc; Z-=YM P ]Q  
 tdc.CreateCompatibleDC(&dc); <S"~vKD'  
 CBitmap*pOld=tdc.SelectObject(&bm); &7?R+ZGo  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }$su4A@0  
 tdc.SelectObject(pOld); OV CR0  
 BITMAP btm; 3cl9wWlJ_E  
 bm.GetBitmap(&btm); 1pp -=$k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; WUdKLx %F  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e= P  
 BITMAPINFOHEADER bih; "HMP$)d  
 bih.biBitCount=btm.bmBitsPixel; G*[P <<je_  
 bih.biClrImportant=0; cRvvzX  
 bih.biClrUsed=0; 2R-A@UE2  
 bih.biCompression=0; $.6K!x{(  
 bih.biHeight=btm.bmHeight; ihL/n  
 bih.biPlanes=1; 9W*+SlH@ !  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6Q|k7*,B  
 bih.biSizeImage=size; $*[{J+t_  
 bih.biWidth=btm.bmWidth; dBC bL.!  
 bih.biXPelsPerMeter=0; |BMV.Zi  
 bih.biYPelsPerMeter=0; @# P0M--X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vP!GJX &n5  
 static int filecount=0; &Jc_Fc(M  
 CString name; -XoPia2  
 name.Format("pict%04d.bmp",filecount++); pI`?(5iK6|  
 name=m_Path+name; ~.Ik#At  
 BITMAPFILEHEADER bfh; <M?:  
 bfh.bfReserved1=bfh.bfReserved2=0; |Q~cX!;  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6bc3 37b  
 bfh.bfSize=54+size; 1a0kfM$  
 bfh.bfOffBits=54; UsVMoX^  
 CFile bf; USJ- e  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D bX{#4lx  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {aKqXL[UP  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); b}ODWdJ1  
  bf.WriteHuge(lpData,size); z1OFcqm  
  bf.Close(); EfLO5$?rm  
  nCount++; td2/9|Q  
 } @=S}=cl  
 GlobalFreePtr(lpData); ^yviV Y  
 if(nCount==1) 10Wz,vW,n  
  m_Number.Format("%d picture captured.",nCount); ]T! }XXK  
 else #1'\.v  
  m_Number.Format("%d pictures captured.",nCount); a[bBT@f  
  UpdateData(FALSE); CLD-mx|?  
} _gNz9$S  
2U kK0ls  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rf+:=|/_3  
{ RNVbcd  
 if(pMsg -> message == WM_KEYDOWN) ` D7C?M#j]  
 { #(Or|\t  
  if(pMsg -> wParam == VK_ESCAPE) Id'RL2Kq*&  
   return TRUE; T<yP* b2E  
  if(pMsg -> wParam == VK_RETURN) l|`9:H  
   return TRUE; 1&=0Wg0ig  
 } ;.s l*q1A  
 return CDialog::PreTranslateMessage(pMsg); 4o:hyh   
} R$kpiqK  
=tTqN+4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2],_^XBvB  
{ z(uZF3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MjfFf} @  
  SaveBmp(); l*b)st_p%  
  return FALSE; PQW(EeQ  
} Gnm4gF!BI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iL{M+Ic  
 CMenu pop; o;"OSp  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *="8?Z  
 CMenu*pMenu=pop.GetSubMenu(0); Rx36?/  
 pMenu->SetDefaultItem(ID_EXITICON); 07T70[G  
 CPoint pt; [36,eK  
 GetCursorPos(&pt); u]^N&2UW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [mxTa\  
 if(id==ID_EXITICON) $5`!Z%>/  
  DeleteIcon(); +Z2MIC|Ud  
 else if(id==ID_EXIT) 3 vP(S IF  
  OnCancel(); {MAQ/5  
 return FALSE; u D 5%E7  
} 4Q=ftY<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jt~Qu-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `;,Pb&W~  
 AddIcon(); s}&bJ"!Z  
 return res; (fD ;g9  
} BIaDY<j90  
bok.j  
void CCaptureDlg::AddIcon() qJ!Z~-hS  
{ XB hb`AG  
 NOTIFYICONDATA data; Y/TlE?  
 data.cbSize=sizeof(NOTIFYICONDATA); FFhtj(hVgc  
 CString tip; .o%^'m"=D[  
 tip.LoadString(IDS_ICONTIP); A \rt6/  
 data.hIcon=GetIcon(0); &WXY'A=  
 data.hWnd=GetSafeHwnd(); P27%xV-n>  
 strcpy(data.szTip,tip); fjo{av~]y  
 data.uCallbackMessage=IDM_SHELL; 8GPIZh'0 h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &MmU  
 data.uID=98; D8{D [fJ;  
 Shell_NotifyIcon(NIM_ADD,&data); Eu}b8c  
 ShowWindow(SW_HIDE); 3>ex5  
 bTray=TRUE; {",MCu_V  
} D\~zS`}  
+ j+5ud`  
void CCaptureDlg::DeleteIcon() ?[TfpAtQ`  
{ JE 5  
 NOTIFYICONDATA data; qM4c]YIaSl  
 data.cbSize=sizeof(NOTIFYICONDATA); <E;pgw!  
 data.hWnd=GetSafeHwnd(); 3:/'t{ ^B  
 data.uID=98; t22;87&|  
 Shell_NotifyIcon(NIM_DELETE,&data); %z]U LEYrZ  
 ShowWindow(SW_SHOW); )O+}T5c=  
 SetForegroundWindow(); m8Vdb"0  
 ShowWindow(SW_SHOWNORMAL); sRVIH A ,  
 bTray=FALSE; ->z54 T  
} # M, 7  
)"(]Lf's  
void CCaptureDlg::OnChange() ql{(Lf$  
{ Jo(`zuLJ  
 RegisterHotkey(); 0X8t>#uF  
} yfQ5:X  
IH48|sa  
BOOL CCaptureDlg::RegisterHotkey() M6 9 w-  
{ vD/NgRBww  
 UpdateData(); 5[l8y ,  
 UCHAR mask=0; {U]H;~3 ?  
 UCHAR key=0; 0l*]L`]L#  
 if(m_bControl) w1x" c>1C  
  mask|=4; 'k;4j|<  
 if(m_bAlt) B0$:b !  
  mask|=2; _CBWb  
 if(m_bShift) <P ,~eX(r  
  mask|=1; @[<nQZw:  
  key=Key_Table[m_Key.GetCurSel()]; s..lK "b  
 if(bRegistered){ c@[:V  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WtQ8X|\`  
  bRegistered=FALSE; 4EI7W,y  
 } gXT9 r' k  
 cMask=mask; .xzEAu;  
 cKey=key; (YBMsh  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vE6mOM!_L  
 return bRegistered; ~0$NJrUy  
} -\ZcOXpMx=  
C`=p +2I]  
  四、小结 r;9 r!$d  
7*Qk`*Ii  
  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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