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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: 21$^k5  
  RW>F %P  
  一、实现方法 "~C \Z} ;  
|RpZr!3V  
  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: qyyLU@hd  
i_6wD  
#pragma data_seg("shareddata") M]\"]H?  
HHOOK hHook =NULL; //钩子句柄 oQyMs>g  
UINT nHookCount =0; //挂接的程序数目 &m(eMX0lU  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5NSXSR9c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ziW[qH {  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 2b {Y1*  
static int KeyCount =0; EI9Yv>7d{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 + $~HRbo  
#pragma data_seg() AO$aWyI  
^1}ffE(3>  
  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。 (I`< ;  
hy"p8j7_  
  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: x2i`$iNhmP  
etW-gbr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /C<} :R  
cKey,UCHAR cMask) jP @t!=  
{ iEFS>kL8e  
 BOOL bAdded=FALSE; cNN_KA  
 for(int index=0;index<MAX_KEY;index++){ jM@@N.  
  if(hCallWnd[index]==0){ AM gvk`<f  
   hCallWnd[index]=hWnd; ;c~DBJg'|  
   HotKey[index]=cKey; F7x< V=4{  
   HotKeyMask[index]=cMask; p|Fhh\,*`X  
   bAdded=TRUE; G`!;RX  
   KeyCount++; uuh vd h=  
   break; 8DrKq]&  
  } Qe/=(P<  
 } Hi{!<e2  
 return bAdded; hG'2(Y!  
} I(WND/&  
//删除热键 $PbN=@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y@'1}=`J  
{ "ZVBn!  
 BOOL bRemoved=FALSE; 8<^6<c  
 for(int index=0;index<MAX_KEY;index++){ ^_ZQf  
  if(hCallWnd[index]==hWnd){ 1/q iE{NW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [laX~(ND{  
    hCallWnd[index]=NULL; .yj=*N.  
    HotKey[index]=0; kqAQrg]n  
    HotKeyMask[index]=0; c9E9Rx  
    bRemoved=TRUE; T{K+1SPy4  
    KeyCount--; o:Z*F0qm  
    break; 7 -V_)FK2c  
   } f4T-=` SO  
  } ?Ve5}N  
 } J=]w$e ?.P  
 return bRemoved; ")M.p_b[Z=  
} u= +  
!c`Q?aGV)  
0\}j[-`pF  
  DLL中的钩子函数如下: PuABS>.;  
Js#c9l{{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `TsfscN  
{ M!6bf  
 BOOL bProcessed=FALSE; TbU9 < mY  
 if(HC_ACTION==nCode)  Ez1*}  
 { <u($!ATb  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qV$',U*+T  
   switch(wParam) $X&OGTlw^  
   {  t_VHw'~"  
    case VK_MENU: :* /``  
     MaskBits&=~ALTBIT; C1rCKKh  
     break; :~)Q]G1Nj  
    case VK_CONTROL: $v oyXi`*  
     MaskBits&=~CTRLBIT; RBgkC+2  
     break; izW l5}+'B  
    case VK_SHIFT: ;09J;sf  
     MaskBits&=~SHIFTBIT; |]\bgh  
     break; +[ }]a3)  
    default: //judge the key and send message _&![s]  
     break; zB]T5]  
   } ;<X3AhF  
   for(int index=0;index<MAX_KEY;index++){ qK1V!a2  
    if(hCallWnd[index]==NULL) ze\~-0ks +  
     continue; a@r K%Iff  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D3lYy>~d5;  
    { 'IW+"o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kWz%v  
     bProcessed=TRUE; rqh,BkQ0t  
    } 1k%ko?  
   } Yh%wf3 UEO  
  } *wF:Q;_<z  
  else if((lParam&0xc000ffff)==1){ //有键按下 g4$%)0x%  
   switch(wParam) 1W!n"3#  
   { 0 De M  
    case VK_MENU: mVL,J=2  
     MaskBits|=ALTBIT; E;d 5$  
     break; CC-:dNb  
    case VK_CONTROL: z|?R=;,u`  
     MaskBits|=CTRLBIT; Po4cbFZ  
     break; O`0$pn  
    case VK_SHIFT: x[^A9  
     MaskBits|=SHIFTBIT; r;T/  
     break; ry]7$MQyV  
    default: //judge the key and send message v#+w<gRq  
     break; Y-c~"#  
   } IP;@unBl  
   for(int index=0;index<MAX_KEY;index++){ xA5$!Oq7  
    if(hCallWnd[index]==NULL) G-^ccdT  
     continue; W=\dsdnu*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _TXV{<E6  
    { omA*XXUx=8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y#Vy:x[  
     bProcessed=TRUE; G\p; bUF  
    } ZAH<!@qh  
   } U?lu@5 ^Z  
  } O]g+z$2o  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -9*WQU9R  
   for(int index=0;index<MAX_KEY;index++){ eztk$o  
    if(hCallWnd[index]==NULL) B;~agr  
     continue; _Lb& 2 PAG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) EDQJ>c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `^ _:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @Kr)$F  
   } `k| nf9_  
  } `s_TY%&_}g  
 } QMxz@HGa|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~+C#c,Nw  
} uRy6~'  
|)-:w?  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: UQcmHZ+lf  
V6{xX0'b*m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c6m,oS^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w;$+7  
qU n>  
  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: -N(MEzAE  
">9CN$]J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y4L9Cxvs  
{ NFc8"7Mz}  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ksaC[G;}:  
 { A,e^bM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _MEv*Q@o  
  SaveBmp(); 'X,V  
  return FALSE; \veL5  
 } EG.C2]Fi  
 …… //其它处理及默认处理 R7{hoqI2  
} 4"{wga~%/  
.Cus t  
(Qm;]?/  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 UG_0Y8$  
k>CtWV5B  
  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。 3Q}Y?rkJ5  
*$$V, 6O.  
  二、编程步骤 >[@d&28b%  
j2Y(Q/i  
  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"; ;#i$0~lRl  
@GtZK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kwR@oVR^  
vNSf:5H$  
  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; TMCA?r%Y\  
w0Y%}7  
  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; RWo B7{G  
B-|Zo_7  
  5、 添加代码,编译运行程序。 UYOn p7R<  
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三、程序代码 <;e#"(7  
XE*bRTEw  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *^Y0}?]qT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) se HbwO3 b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iGMONJRO  
#if _MSC_VER > 1000 ZG<!^tj  
#pragma once pd3&AsU  
#endif // _MSC_VER > 1000  Vb 9N~v  
#ifndef __AFXWIN_H__ a4RFn\4?  
#error include 'stdafx.h' before including this file for PCH b1]_e'jj  
#endif k& s7 -yY  
#include "resource.h" // main symbols # :w2Hf6Q  
class CHookApp : public CWinApp u/c3omY"#  
{ ]Hy PJ  
 public: )"uG*}\?b  
  CHookApp(); <,4(3 >js  
  // Overrides veg!mY2&  
  // ClassWizard generated virtual function overrides /$,=>  
  //{{AFX_VIRTUAL(CHookApp) D#1~]d  
 public: 1T,PC?vr{  
  virtual BOOL InitInstance(); by[i"!RCu  
  virtual int ExitInstance(); UiZp -Y%ki  
  //}}AFX_VIRTUAL i(iP}: 3  
  //{{AFX_MSG(CHookApp) ?(8%SPRk  
  // NOTE - the ClassWizard will add and remove member functions here. TF-Ty  
  // DO NOT EDIT what you see in these blocks of generated code ! So.P @CCd  
  //}}AFX_MSG mS}x2 &  
  DECLARE_MESSAGE_MAP() ,GU/l)os`  
}; ]UT|BE4v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B~z g"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .<^Y E%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /'fDXSdP  
BOOL InitHotkey(); {WeXURp&nF  
BOOL UnInit(); @[lc0_ b  
#endif 7O{O')o!  
89#0vG7m  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?lN8~Ze  
#include "stdafx.h" M2Fj)w2   
#include "hook.h" '#PqI)P  
#include <windowsx.h> wKS-O%?  
#ifdef _DEBUG gam#6 s  
#define new DEBUG_NEW &MZy;Sq  
#undef THIS_FILE lN>C#e<]  
static char THIS_FILE[] = __FILE__; `Uj?PcS_  
#endif )NmlV99q  
#define MAX_KEY 100 Wo+CQH6(  
#define CTRLBIT 0x04 <Iyot]E  
#define ALTBIT 0x02 DbU;jorwu  
#define SHIFTBIT 0x01 ,]_(-tyN|  
#pragma data_seg("shareddata") v#]v,C-*  
HHOOK hHook =NULL; EQ63VF  
UINT nHookCount =0; xf"5<PTW</  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E+ 3yN\X(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Df:7P>  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A a} o*  
static int KeyCount =0; kefv=n*]l  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift I#E(r>KW*  
#pragma data_seg() l()MYuLNV  
HINSTANCE hins; 2, "q_d'V  
void VerifyWindow(); ,,gLrV k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) N46$EsO!h  
//{{AFX_MSG_MAP(CHookApp) vd7N&c9  
// NOTE - the ClassWizard will add and remove mapping macros here. 0$L0fhw.  
// DO NOT EDIT what you see in these blocks of generated code! _OU.JrqC  
//}}AFX_MSG_MAP ;i9<y8Dha  
END_MESSAGE_MAP() W({TC  
j-`X_8W  
CHookApp::CHookApp() ''OInfd?  
{ wYO"znd  
 // TODO: add construction code here, b}Hl$V(uD  
 // Place all significant initialization in InitInstance }i7U}T  
} Gk"L%Zt)  
koEX4q  
CHookApp theApp; UcLNMn|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VMZ]n%XRXW  
{ }pE~85h4M  
 BOOL bProcessed=FALSE; zP(=,)d  
 if(HC_ACTION==nCode) v V6Lp  
 { K+@eH#Cv,(  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]8m_*I!  
   switch(wParam) s |gD  
   { $rpTs?j*K$  
    case VK_MENU: ]r6BLZ[%  
     MaskBits&=~ALTBIT; leES YSY:  
     break; A` o?+2s_  
    case VK_CONTROL: ;j>Vt?:Pw  
     MaskBits&=~CTRLBIT; _m7U-;G  
     break; grCO-S|j^  
    case VK_SHIFT: vf'cx:m  
     MaskBits&=~SHIFTBIT; OVUs]uK  
     break; Xm8Z+}i  
    default: //judge the key and send message S}w.#tyEn  
     break; @bW[J  
   } v-;XyVx  
   for(int index=0;index<MAX_KEY;index++){ S@}B:}2  
    if(hCallWnd[index]==NULL) rI<nUy P?  
     continue; ?wLdW1&PpX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c/=y*2,zo  
    { Y0PGT5].@'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); UROj9CO v  
     bProcessed=TRUE; ^0Q=#p  
    } EO].qN-8  
   } P('t6MVl T  
  } "s>fV9YyZ  
  else if((lParam&0xc000ffff)==1){ //Key down 2fzKdkJhe  
   switch(wParam) OHHNWg_5  
   { ," C[Qg(  
    case VK_MENU: $K?T=a;z  
     MaskBits|=ALTBIT; )pjjW"C+  
     break; lHcZi  
    case VK_CONTROL: # 5y9L  
     MaskBits|=CTRLBIT; {}g %"mi#  
     break; &N"'7bK6n  
    case VK_SHIFT: jB%"AvIX  
     MaskBits|=SHIFTBIT; 0Oc}rRH(C  
     break; >lraYMc<rZ  
    default: //judge the key and send message ` y^zM/Ib  
     break; *U;4t/(  
   } X`fhln9N  
   for(int index=0;index<MAX_KEY;index++) Jtp>m?1Ve  
   { [;?"R-V"z  
    if(hCallWnd[index]==NULL) JFG",09]  
     continue; f`hyYp`d5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) egI{!bZg'\  
    { ,pyQP^u-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iY ^{wi~?  
     bProcessed=TRUE; 1m>^{u  
    } I%}L@fZ  
   } <AI>8j6#B  
  } v}F4R $  
  if(!bProcessed){ &gGs) $f[  
   for(int index=0;index<MAX_KEY;index++){ 7_Ba3+9jpa  
    if(hCallWnd[index]==NULL) (]3ERPn#y  
     continue; 3:[!t%Yb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cxXbo a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); W!/vm  
   } L289'Gzg  
  } 1z~k1usRK  
 } /7k.r}6\R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zBk_-'z  
} Kajkw>z  
y)3~]h\a  
BOOL InitHotkey() 4? m/*VV  
{ 5-8]N>/b!  
 if(hHook!=NULL){ `*e4m  
  nHookCount++; L!;^ #g  
  return TRUE; 6P;o 6s  
 } M!N` Orz  
 else 4 ,p#:!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ycgfZ 3K  
  if(hHook!=NULL) L]k*QIn:h  
   nHookCount++; `OKo=e~,  
  return (hHook!=NULL); CN.6E<9'kK  
} e7@li<3>d  
BOOL UnInit() Mjb 1  
{ p`>AnfG  
 if(nHookCount>1){ 5oz>1  
  nHookCount--; ow2M,KU6Z  
  return TRUE; 6xQ"bFm  
 } \#PP8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); B/jrYT$;m  
 if(unhooked==TRUE){ Ln ~4mN^  
  nHookCount=0; 0TTIaa$  
  hHook=NULL; DpA\r_D  
 } "_ LkZBW.  
 return unhooked; hzaLx8L  
} :3*`IB !  
)fNGB]%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C/F@ ]_y  
{ L)q`D2|'  
 BOOL bAdded=FALSE; @&?a]>L  
 for(int index=0;index<MAX_KEY;index++){ W|;nJs:e  
  if(hCallWnd[index]==0){ C@%iQ]=  
   hCallWnd[index]=hWnd; jEUx q%BH  
   HotKey[index]=cKey; B-!guf rnY  
   HotKeyMask[index]=cMask; 8NnhT E  
   bAdded=TRUE; z>6.[Z(T  
   KeyCount++; c  Qld$  
   break; 1'NhjL  
  } o g_Ri$x8  
 } RNGO~:k?r  
 return bAdded; y k?SD1hj  
} j7f5|^/x3  
Ll,I-BQ 9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mHKJ  
{ t-_#Q bzE{  
 BOOL bRemoved=FALSE; XmP;L(wa   
 for(int index=0;index<MAX_KEY;index++){ avlqDi1l  
  if(hCallWnd[index]==hWnd){ I$n+DwKcN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^>-+@+( r  
    hCallWnd[index]=NULL; qtO1hZ  
    HotKey[index]=0; Ujf,6=M  
    HotKeyMask[index]=0; W:WQaF`2x  
    bRemoved=TRUE; cI5N"U@yN  
    KeyCount--; Tj=gRQ2v  
    break; UL&} s_  
   } -(!uC +BZX  
  } K k7GZ  
 } *t^eNUA  
 return bRemoved; NN^QUB  
} "c6<zP  
bV_j`:MD  
void VerifyWindow() W;qP=DK2  
{ C?/r;  
 for(int i=0;i<MAX_KEY;i++){ J2m"1gq,  
  if(hCallWnd!=NULL){ <P- $RX  
   if(!IsWindow(hCallWnd)){ Q |%-9^  
    hCallWnd=NULL; C ck#Y  
    HotKey=0; Y.7}  
    HotKeyMask=0; n[|6khOL-  
    KeyCount--; Y,'%7u  
   } E$ {J  
  } 6.[)`iF+#  
 } ?H`j>]%&  
} 6F(hY !}5  
vHS2q >  
BOOL CHookApp::InitInstance() guU=NQZ  
{ $(3uOsy   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [P{a_(  
 hins=AfxGetInstanceHandle(); )AI?x@  
 InitHotkey(); 40u7fojg2  
 return CWinApp::InitInstance(); !~)90Z!  
} u\f3qc,]F  
B_hPcmB  
int CHookApp::ExitInstance() mg`j[<wp  
{ tU{\ev$x  
 VerifyWindow(); ;= a_B1"9u  
 UnInit(); B[CA 5Ry  
 return CWinApp::ExitInstance(); 44~hw:   
} zZ: xEc  
w-ALCh8o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Fwb5u!_,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) aZ6'|S;  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <6/= y1QC)  
#if _MSC_VER > 1000 0'`S,  
#pragma once 6lsEGe  
#endif // _MSC_VER > 1000 `Ug tvo  
$Zxt&a  
class CCaptureDlg : public CDialog  t!jYu<P  
{ "TNVD"RLY  
 // Construction QXs8:;T  
 public: q6R Eh;$  
  BOOL bTray; B)M& \: _  
  BOOL bRegistered; &pL/ @2+  
  BOOL RegisterHotkey(); 6T_K9  
  UCHAR cKey; 6Cv.5V hx  
  UCHAR cMask; IB8gDP2  
  void DeleteIcon(); gqfDa cDJL  
  void AddIcon(); 6J\fF tB@V  
  UINT nCount; >La><.z~  
  void SaveBmp(); q(Hip<6p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O[FZq47  
  // Dialog Data 'C^;OjAg  
  //{{AFX_DATA(CCaptureDlg) p?JQ[K7i  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z/g]o#  
  CComboBox m_Key; >?I/;R.-  
  BOOL m_bControl; 5$%XvM  
  BOOL m_bAlt; doR4nRl9  
  BOOL m_bShift; '#q4Bc1  
  CString m_Path; n1,S_Hs  
  CString m_Number; JRY_ nX  
  //}}AFX_DATA Zj!Abji=O  
  // ClassWizard generated virtual function overrides Ys3uPs  
  //{{AFX_VIRTUAL(CCaptureDlg) 35_)3 R)  
 public: e>AXXUEf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |@wyC0k!  
 protected: @^&7$#jq%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mlB~V3M'G  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); moZm0` WR  
  //}}AFX_VIRTUAL D"^'.DL@wG  
  // Implementation e)b%`ntF  
 protected: gi$XB}L+X  
  HICON m_hIcon; I]9 C_  
  // Generated message map functions \f%.n]>  
  //{{AFX_MSG(CCaptureDlg) 8EI:(NE*J  
  virtual BOOL OnInitDialog(); "%@v++4y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6pp$-uS  
  afx_msg void OnPaint(); S)7/0N79A  
  afx_msg HCURSOR OnQueryDragIcon(); ix&'0IrX*  
  virtual void OnCancel(); lP3h<j  
  afx_msg void OnAbout(); Jzex]_:1~  
  afx_msg void OnBrowse(); <cj{Qk  
  afx_msg void OnChange(); I 8z G~L%"  
 //}}AFX_MSG u-:Ic.ZV  
 DECLARE_MESSAGE_MAP() '3Q3lM'lh  
};  "r$/  
#endif )];aIA$  
tJ'iX>9I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file snC/H G7  
#include "stdafx.h" FnE6?~xa  
#include "Capture.h" UQPU"F7.  
#include "CaptureDlg.h" 24B<[lSK  
#include <windowsx.h> %u!b& 5]e  
#pragma comment(lib,"hook.lib") `q_<Im%I  
#ifdef _DEBUG xaW{I7FfG  
#define new DEBUG_NEW d1G8*YO@  
#undef THIS_FILE Cy@ cLdV  
static char THIS_FILE[] = __FILE__; g7n "  
#endif ;gB`YNL  
#define IDM_SHELL WM_USER+1 yWb4Ify  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rQr!R$t/[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,Eu?JH&}u  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U(,.D}PG  
class CAboutDlg : public CDialog :_HF j.JW  
{ 7lA:)a_!]  
 public: `hUHel;6  
  CAboutDlg(); k;KdW P  
  // Dialog Data r\qz5G *6  
  //{{AFX_DATA(CAboutDlg) /.Q4~Hw%}  
  enum { IDD = IDD_ABOUTBOX }; eR;!(Oy=A  
  //}}AFX_DATA 5/@UVY9_  
  // ClassWizard generated virtual function overrides uQ3[Jz`y  
  //{{AFX_VIRTUAL(CAboutDlg) orfp>B) 0  
 protected: <Ef[c@3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h-QLV[^  
  //}}AFX_VIRTUAL :Li/=>R^  
  // Implementation {vVTv SC  
 protected: : ]II-$/8  
  //{{AFX_MSG(CAboutDlg) Ed-M7#wY  
  //}}AFX_MSG D/ Dt   
  DECLARE_MESSAGE_MAP() Vw~\H Gs/~  
}; @PSLs *  
w/m:{cHk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l,`!rF_  
{ ^4pto$#@O:  
 //{{AFX_DATA_INIT(CAboutDlg) rx!=q8=0R  
 //}}AFX_DATA_INIT n7! H:{L  
} [TTSA2  
WNy3@+@GZ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 46No%cSiG  
{ A)NkT`<)  
 CDialog::DoDataExchange(pDX); 2`bdrRD0  
 //{{AFX_DATA_MAP(CAboutDlg) =RKSag&  
 //}}AFX_DATA_MAP f.xA_Y>  
} 8dO?K*J,H'  
0.;}]v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;[ 'a  
 //{{AFX_MSG_MAP(CAboutDlg) MesRa(  
 // No message handlers ,o#kRWRG  
 //}}AFX_MSG_MAP HdX2YPYn;  
END_MESSAGE_MAP() 8%:]W^  
))T>jh   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WAPhv-6  
: CDialog(CCaptureDlg::IDD, pParent)  $xgBKD  
{ \'v(Xp6  
 //{{AFX_DATA_INIT(CCaptureDlg) Z-X?JA\&  
  m_bControl = FALSE; {?8B,G2r  
  m_bAlt = FALSE; 7E7dSq  
  m_bShift = FALSE; @cD uhK"U}  
  m_Path = _T("c:\\"); TO#Pz.)>B6  
  m_Number = _T("0 picture captured."); .~D>5 JnEk  
  nCount=0; !8RwO%c(  
  bRegistered=FALSE; tWPO]3hW  
  bTray=FALSE; {D`T0qPT[  
 //}}AFX_DATA_INIT osP\D iQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G| m4m.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H9 tXSh  
} A\sI<WrH  
7 hw .B'7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 04@cLDX8uB  
{ =xN= #  
 CDialog::DoDataExchange(pDX); -:Rp'SJ  
 //{{AFX_DATA_MAP(CCaptureDlg) EL{vFP  
  DDX_Control(pDX, IDC_KEY, m_Key); nt :N!suP3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K_&MoyJJ9f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3Ofc\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &#w=7L3AW  
  DDX_Text(pDX, IDC_PATH, m_Path); E-2 eOT  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @{HrJ/4%:&  
 //}}AFX_DATA_MAP aUopNmN  
} vqdX^m^PY  
I PCGt{B~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \XzM^K3  
//{{AFX_MSG_MAP(CCaptureDlg) DXR:1w[^  
 ON_WM_SYSCOMMAND() R9o-`Wz  
 ON_WM_PAINT() ,<Kx{+ [h  
 ON_WM_QUERYDRAGICON() i@P}{   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jLVl4h&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W;_E4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) kUl  
//}}AFX_MSG_MAP g=8un`]7  
END_MESSAGE_MAP() !q"cpL'4  
42C<1@>zO  
BOOL CCaptureDlg::OnInitDialog() !cX[-}Q  
{ YTaLjITG  
 CDialog::OnInitDialog(); R^&q-M=O[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8Cx^0  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1Y j~fb(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); YK#fa2ng  
 if (pSysMenu != NULL) Dl\`  
 { b1?xeG#  
  CString strAboutMenu; =d`5f@'rl  
  strAboutMenu.LoadString(IDS_ABOUTBOX); t*S." q  
  if (!strAboutMenu.IsEmpty()) hGTV;eU  
  { Xl-e !  
   pSysMenu->AppendMenu(MF_SEPARATOR); :l\V'=%9'@  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :l u5Uu~  
  } O6s.<` \  
 } $.E6S<(h  
 SetIcon(m_hIcon, TRUE); // Set big icon -G|a*^  
 SetIcon(m_hIcon, FALSE); // Set small icon 9J-b6,  
 m_Key.SetCurSel(0); %VNlXHO.  
 RegisterHotkey(); r7m D{0s*  
 CMenu* pMenu=GetSystemMenu(FALSE); 'Prxocxq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Li{~=S@N*  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2[yBD-":  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); N:5[,O<m_  
 return TRUE; // return TRUE unless you set the focus to a control |UUdz_i!:  
} P5 <vf  
aoW6U{\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <yUstz,Xu^  
{ v $({C  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) KA s1(oG  
 { \3YO<E!t  
  CAboutDlg dlgAbout; (g!p>m!Z  
  dlgAbout.DoModal(); 8MwK.H[U  
 } ts~{w; c  
 else [1G^/K"  
 { >!6JKL~=  
  CDialog::OnSysCommand(nID, lParam); NZLAk~R;0  
 } BRRj$)u  
} d9^E.8p$  
30j|D3-  
void CCaptureDlg::OnPaint() ?=Pd  
{ vw>jJ  
 if (IsIconic()) n$L51#'  
 { @ EuFJ=h  
  CPaintDC dc(this); // device context for painting LJlZ^kh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f:JlZ&  
  // Center icon in client rectangle V&{MQWy  
  int cxIcon = GetSystemMetrics(SM_CXICON); S_(d9GK<  
  int cyIcon = GetSystemMetrics(SM_CYICON); KFRw67^  
  CRect rect; (]2H7X:b  
  GetClientRect(&rect); PXKJ^fa  
  int x = (rect.Width() - cxIcon + 1) / 2; <cN~jv-w$  
  int y = (rect.Height() - cyIcon + 1) / 2; m:QG}{<.h  
  // Draw the icon B^ 7eoW  
  dc.DrawIcon(x, y, m_hIcon); r),PtI0X  
 } 7*+]wEs  
 else >p\e 0n  
 { )(M7lq.e7  
  CDialog::OnPaint(); &]6) LFm  
 } gxNL_(A  
} ~#K@ADYr  
gk0.zz([  
HCURSOR CCaptureDlg::OnQueryDragIcon() 6aft$A}XnD  
{ _o3e]{  
 return (HCURSOR) m_hIcon; &?,U_)x/  
}  (t^n'V  
~:4kU/]  
void CCaptureDlg::OnCancel() -NGK@Yk22  
{ N3BL3:@O  
 if(bTray) 8,T4lb<<  
  DeleteIcon(); v5}X+'  
  CDialog::OnCancel(); >TL^>D  
} kh$_!BT  
g\fhp{gWB  
void CCaptureDlg::OnAbout() ;!>Wz9  
{ Xf'=+f2p  
 CAboutDlg dlg; q6#<[ 4?  
 dlg.DoModal(); w42OF7f  
} zk_Eb?mhwV  
:Sg&0Wj+#j  
void CCaptureDlg::OnBrowse() .>g1 $rj  
{ 6aO2:|:yP  
 CString str; +\ _{x/u1  
 BROWSEINFO bi; eP1nUy=T  
 char name[MAX_PATH]; 5/><$06rq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ^?"\?M1  
 bi.hwndOwner=GetSafeHwnd(); b p<^R  
 bi.pszDisplayName=name; l(W[_ D  
 bi.lpszTitle="Select folder"; \`.F\ Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E8\XNG)V4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -[7O7'  
 if(idl==NULL) #U7_a{cn"M  
  return; )P&9A)8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y8Xv~4qQW  
 str.ReleaseBuffer(); F'8T;J7  
 m_Path=str; >T3H qYX5W  
 if(str.GetAt(str.GetLength()-1)!='\\') &Nl2s ey  
  m_Path+="\\"; 'vV$]/wBF  
 UpdateData(FALSE); x+5p1sv6  
} o?Nu:&yE  
 cc=gCE  
void CCaptureDlg::SaveBmp() l U]un&[N  
{ rsNf$v-*  
 CDC dc; J:dof:q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0X|_^"!  
 CBitmap bm; GV|9H]_,I  
 int Width=GetSystemMetrics(SM_CXSCREEN); shC;hR&;  
 int Height=GetSystemMetrics(SM_CYSCREEN); _;9!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Xt/Ksw"wn  
 CDC tdc; 8kL4~(hY  
 tdc.CreateCompatibleDC(&dc); R,2=&+ e  
 CBitmap*pOld=tdc.SelectObject(&bm); D>L2o88  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O>y'Nqz  
 tdc.SelectObject(pOld); MhEw _{?  
 BITMAP btm; !eR3@%4  
 bm.GetBitmap(&btm); r{Rg920  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; yTM3^R(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); V3N0Og3  
 BITMAPINFOHEADER bih; cR{>IH4^  
 bih.biBitCount=btm.bmBitsPixel; 4'pS*v  
 bih.biClrImportant=0; :PY tR  
 bih.biClrUsed=0; .lG5=Th!  
 bih.biCompression=0; PaB!,<A  
 bih.biHeight=btm.bmHeight; *4Fr&^M\  
 bih.biPlanes=1; -4#2/GXNO  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^n.WZUk  
 bih.biSizeImage=size; ws/63 d*  
 bih.biWidth=btm.bmWidth; EpPf _ \o  
 bih.biXPelsPerMeter=0; ^4Am %yyT  
 bih.biYPelsPerMeter=0; `b5 @}',  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >RI>J.~  
 static int filecount=0; GyI-)Bl DC  
 CString name; ~ AQp|  
 name.Format("pict%04d.bmp",filecount++); 3:/'n  
 name=m_Path+name; )vB2!H/  
 BITMAPFILEHEADER bfh; y %8op:'  
 bfh.bfReserved1=bfh.bfReserved2=0; H5>hx {  
 bfh.bfType=((WORD)('M'<< 8)|'B'); / jTT5  
 bfh.bfSize=54+size; :6kjEI  
 bfh.bfOffBits=54; h~Q)Uy5N(D  
 CFile bf; >-< 8N-@"n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R>@uY( >dJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Vn=qV3OE]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q/>L_S  
  bf.WriteHuge(lpData,size); I8Vb-YeS  
  bf.Close(); <3X7T6_:@  
  nCount++; Rhzn/\)|  
 } T5Eseesp  
 GlobalFreePtr(lpData); iX{G]< n  
 if(nCount==1) 1t[j"CG(o  
  m_Number.Format("%d picture captured.",nCount); 9a$56GnW1  
 else {NM+Oj,~'  
  m_Number.Format("%d pictures captured.",nCount); )QiQn=Ce  
  UpdateData(FALSE); ,SlN zR  
} 0o&MB Dp  
=4!nFi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U_yE& 6 T  
{ 7EhN u@5-  
 if(pMsg -> message == WM_KEYDOWN) %WFu<^jm  
 { E N^Uki`  
  if(pMsg -> wParam == VK_ESCAPE) RuW!*LI  
   return TRUE; |dE -^"_  
  if(pMsg -> wParam == VK_RETURN) >cmE t  
   return TRUE; !|?e7u7  
 } G28O%jD?  
 return CDialog::PreTranslateMessage(pMsg); 5 x2Ay=s  
} ~q +[<xR\  
*v%rMU7,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L *[K>iW  
{ 3*S{;p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uZKP"Oy  
  SaveBmp(); ?ne_m:J[  
  return FALSE; 2LY=D L7  
} !{^\1QK  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O  OFVnu  
 CMenu pop; >n5:1.g  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xom<P+M!|  
 CMenu*pMenu=pop.GetSubMenu(0); {1 J&xoV"  
 pMenu->SetDefaultItem(ID_EXITICON); a)-FG P^  
 CPoint pt; w>?Un,K  
 GetCursorPos(&pt); _cDF{E+;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u8zbYd3  
 if(id==ID_EXITICON) }}{!u0N},V  
  DeleteIcon(); 6"j_iB  
 else if(id==ID_EXIT) {.e=qQ%P5)  
  OnCancel(); "R #k~R  
 return FALSE; woH)0v  
} =/Aj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %T`U^ Pnr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) s0UFym 8  
 AddIcon(); qd@&59zSh  
 return res; )4Q?aMm  
} o;F" {RZ  
a5'#j35  
void CCaptureDlg::AddIcon() ug 7o>PX  
{ XdEPbD-  
 NOTIFYICONDATA data; Vsq8H}K  
 data.cbSize=sizeof(NOTIFYICONDATA); DmqX"x%P  
 CString tip; zRl~^~sY  
 tip.LoadString(IDS_ICONTIP); DLPUqKL]  
 data.hIcon=GetIcon(0); +';>=hha  
 data.hWnd=GetSafeHwnd(); E|"=. T  
 strcpy(data.szTip,tip); =H7xD"'%R  
 data.uCallbackMessage=IDM_SHELL; i?;r7>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g8;D/  
 data.uID=98; mo]KCi  
 Shell_NotifyIcon(NIM_ADD,&data); `RQ#.   
 ShowWindow(SW_HIDE); 92W&x'  
 bTray=TRUE; 3cl9wWlJ_E  
} 1pp -=$k  
WUdKLx %F  
void CCaptureDlg::DeleteIcon() e= P  
{ JYqSL)Ta*t  
 NOTIFYICONDATA data; nCg66-3A  
 data.cbSize=sizeof(NOTIFYICONDATA);  EEy$w1ec  
 data.hWnd=GetSafeHwnd(); d4[(8} x$/  
 data.uID=98; 01a-{&   
 Shell_NotifyIcon(NIM_DELETE,&data); u8b2$D  
 ShowWindow(SW_SHOW); JEn3`B!*  
 SetForegroundWindow(); r WtZj}A  
 ShowWindow(SW_SHOWNORMAL); `<\}FS`'  
 bTray=FALSE; beY=g7|  
} Ru!He,k7  
@pV5}N[]  
void CCaptureDlg::OnChange() z(RL<N%  
{ {xcZ*m!B  
 RegisterHotkey(); 7;`o( [N  
} D8K-K]W@  
> Vb@[  
BOOL CCaptureDlg::RegisterHotkey() dHnR_.  
{ 6" T['6:j  
 UpdateData(); k ^'f[|}  
 UCHAR mask=0; HYr}wG  
 UCHAR key=0; UO`;&e-DB  
 if(m_bControl) AtS;IRN@  
  mask|=4; e`tLR- &  
 if(m_bAlt) H2gj=krK  
  mask|=2; QA!_} N4n  
 if(m_bShift) s,VXc/  
  mask|=1; |8_JY2 R  
  key=Key_Table[m_Key.GetCurSel()]; UAS@R`?cI  
 if(bRegistered){ Y+%sBqo @  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); < O*6 T%;  
  bRegistered=FALSE; ;d.K_P  
 } .uo.N   
 cMask=mask; C=Fzu&N}  
 cKey=key; |C \}P  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9V uq,dv  
 return bRegistered; 2U kK0ls  
} rf+:=|/_3  
RNVbcd  
  四、小结 ` D7C?M#j]  
w^k;D,h  
  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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