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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: Xx;4  
  WY`hNT6M  
  一、实现方法 -'F? |  
[(D^`K<b  
  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: =c1t]%P,  
0f]LOg  
#pragma data_seg("shareddata") u''~nSR3&  
HHOOK hHook =NULL; //钩子句柄 k\wcj^"cb  
UINT nHookCount =0; //挂接的程序数目 ^a?H "  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \}9GK`oR  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 J[7|Ul1 <  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey {I"`(  
static int KeyCount =0; <RPy   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6d%'>^`(o-  
#pragma data_seg() [T>a}}@  
<-%OXEG  
  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。 7$HN5T\!  
P3u,)P&  
  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: 1~_&XNb&  
w=K!U]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR tMnwY'  
cKey,UCHAR cMask) Rd|xw%R\mb  
{ @!MhVNS_<  
 BOOL bAdded=FALSE; /'uFX,  
 for(int index=0;index<MAX_KEY;index++){ SPEDN}/^  
  if(hCallWnd[index]==0){ [ta3sEPjs  
   hCallWnd[index]=hWnd; @ApX43U(  
   HotKey[index]=cKey; ),#hBB`ZA  
   HotKeyMask[index]=cMask; )?qH#>mD6  
   bAdded=TRUE; tMQz'3,X  
   KeyCount++; Qk_` IlSd  
   break; $Afw]F$  
  } [tEHr  
 } e|&}{JP{[  
 return bAdded; #Emz9qTsce  
} o7B }~;L  
//删除热键 @*{sj`AS '  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [Dou%\  
{ )VoQ/ch<  
 BOOL bRemoved=FALSE; <6L=% \X{*  
 for(int index=0;index<MAX_KEY;index++){ 1;$8=j2  
  if(hCallWnd[index]==hWnd){ $,v[<T`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F')fi0=  
    hCallWnd[index]=NULL; sM0o,l(5  
    HotKey[index]=0; oPVyLD  
    HotKeyMask[index]=0; D3i`ehh  
    bRemoved=TRUE; 5lp};  
    KeyCount--; IQ3]fLb  
    break; R]8^ @i1  
   } $k= 5nJ  
  } SF#Rc>v  
 } K,o@~fj  
 return bRemoved; 'CkN  
} -'jPue2\  
WI+ 5x  
w6w'Jx  
  DLL中的钩子函数如下: cHO8%xu`  
! !9l@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V`;$Ua;y  
{ Ml Bw=Nr  
 BOOL bProcessed=FALSE; !`VC4o  
 if(HC_ACTION==nCode) tq^d1b(j4  
 { wWU5]v  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 o"5[~$O  
   switch(wParam) oF9c>^s  
   {  C"=^ (HU  
    case VK_MENU: HvSYE[Zt|  
     MaskBits&=~ALTBIT; Edi`x5"l  
     break; }[%d=NY  
    case VK_CONTROL: Gd08RW  
     MaskBits&=~CTRLBIT; m=7Z8@sX},  
     break; vKCgtk  
    case VK_SHIFT: !R/- |Kjy  
     MaskBits&=~SHIFTBIT; ZKT~\l  
     break; O*d4zBT  
    default: //judge the key and send message NX5A{  
     break; d|, B* N(w  
   } ~.,h12  
   for(int index=0;index<MAX_KEY;index++){ G',*"mZQ[  
    if(hCallWnd[index]==NULL) _\y%u_W  
     continue; ,*w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BL&D|e  
    { QlFt:?7f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H^e0fm  
     bProcessed=TRUE; kQY+D1  
    } E*F)jP,yo  
   } ^ew<|J2,B  
  } =:;KY uTr  
  else if((lParam&0xc000ffff)==1){ //有键按下 xn)eb#r  
   switch(wParam) l`}Ag8Q  
   { $)fybn Y  
    case VK_MENU: EC6Q<&]Iw  
     MaskBits|=ALTBIT; Wveba)"$  
     break; ydyGPZ t  
    case VK_CONTROL: L`!M3c@u  
     MaskBits|=CTRLBIT; i47xF7y\  
     break;   ps*dO  
    case VK_SHIFT: 1`X- O>  
     MaskBits|=SHIFTBIT; {ta0dS;1  
     break; j+>#.22+  
    default: //judge the key and send message sMikTwR/^  
     break; O73 /2=1V  
   } 3w B03\P  
   for(int index=0;index<MAX_KEY;index++){ S24wv2Uw i  
    if(hCallWnd[index]==NULL) j$K[QSn  
     continue; -q-/0d<l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 27NhYDo  
    { F$QAWs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5*d  
     bProcessed=TRUE; X@[)jWs  
    } { fmY_T[Q8  
   } $m:4'r  
  } D<m+M@u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D=Pv:)*]  
   for(int index=0;index<MAX_KEY;index++){ a V4p0s6ZZ  
    if(hCallWnd[index]==NULL) u*<G20~A  
     continue; K^_Mt!%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jb~/>I^1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H$/r{gfg^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 h]#wwJF  
   } 7fOk]Yl[  
  } tv+H4/  
 } N~%F/`Z<+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~alC5|wCUQ  
} g`skmHS89  
r9a?Y!(  
  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: {[&_)AW6m%  
-[I}"Glz:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \9S&j(I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KvM}g2"  
cN{-&\ 6L  
  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: Dw@0P  
B>11  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +P&;cCV`S3  
{ 'e3[m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =H F||p@  
 { {iv!A=jld  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r#K;@wu2  
  SaveBmp(); |Q'l&Gt6  
  return FALSE; D&xb tJd  
 } u'?yc"d>#  
 …… //其它处理及默认处理 U*Hw t\  
} f&\v+'[p  
qGE?[\t[6  
)7e[o8O_6  
  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。 H nRd  
0wmz2zKV  
  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。 j]#-DIL  
ZjE!? '(ef  
  二、编程步骤 [S}o[v\  
_%)v9}D  
  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"; ~ "] 6  
T4\F=iw4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7DU"QeLeb  
1,p[4k~Ww  
  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; S >PTD@  
Lmy ^/P%  
  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; ugM,wT&~Y  
dz',!|>  
  5、 添加代码,编译运行程序。 v@43 %`"Gj  
tNskB`541  
三、程序代码 V01-n{~G  
X^PR];V:$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0;Y|Ua[G+~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x+}6qfc$9k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :eK;:pN  
#if _MSC_VER > 1000 QES[/i +  
#pragma once %5=XszS  
#endif // _MSC_VER > 1000 D cN s`2  
#ifndef __AFXWIN_H__ G_wzUk=L  
#error include 'stdafx.h' before including this file for PCH V}#2pP  
#endif  H4HWr6  
#include "resource.h" // main symbols fz`+j -u  
class CHookApp : public CWinApp "tga FtC=w  
{ |M?yCo  
 public: =H_|007C  
  CHookApp(); )+[{MR '  
  // Overrides YQ`GOP#/  
  // ClassWizard generated virtual function overrides 8F(_Vqu  
  //{{AFX_VIRTUAL(CHookApp) eZ]4,,m  
 public: P5+FZzQ  
  virtual BOOL InitInstance(); 0Ts[IHpg&E  
  virtual int ExitInstance(); 5@$b@jTd  
  //}}AFX_VIRTUAL M]?#]3XBNo  
  //{{AFX_MSG(CHookApp) "+js7U-  
  // NOTE - the ClassWizard will add and remove member functions here. -f.<s!a  
  // DO NOT EDIT what you see in these blocks of generated code ! Tc6H%itV  
  //}}AFX_MSG PrIS L[@  
  DECLARE_MESSAGE_MAP() V~+{douq  
}; 6g*B=d(j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cH()Ze-B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yfS`g-j{~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jXO*_R  
BOOL InitHotkey(); -WIT0F4o;  
BOOL UnInit(); M"OX NPkc  
#endif {89F*  
R{~Yh.)~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T!uK _  
#include "stdafx.h" fiSc\C~  
#include "hook.h" Q:\I %o  
#include <windowsx.h> ) MFa~/x  
#ifdef _DEBUG bQlShVJL  
#define new DEBUG_NEW JVAJL q  
#undef THIS_FILE (]Z%&>*  
static char THIS_FILE[] = __FILE__; iHo2=Cz  
#endif &|7pu=  
#define MAX_KEY 100 )1a3W7  
#define CTRLBIT 0x04 Oo<^~d2=  
#define ALTBIT 0x02 r"OVu~ND  
#define SHIFTBIT 0x01 *yqEl O  
#pragma data_seg("shareddata") [X.sCl|  
HHOOK hHook =NULL; -r_/b  
UINT nHookCount =0; &eQF[8 ,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B Mh 949;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT uh UC m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lHwQ'/r  
static int KeyCount =0; e,qc7BJzK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F/[vg  
#pragma data_seg() ^'=J'Q  
HINSTANCE hins; I\O<XJO)_  
void VerifyWindow(); ^$aj,*Aj~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) . gK*Jpmx  
//{{AFX_MSG_MAP(CHookApp) s@C@q(i6  
// NOTE - the ClassWizard will add and remove mapping macros here. i,BE]w  
// DO NOT EDIT what you see in these blocks of generated code! F>,kKR-  
//}}AFX_MSG_MAP Z 4uft  
END_MESSAGE_MAP() $ u`y  
zq g4@" p  
CHookApp::CHookApp() w%Tcx^:  
{ Wyf+xr'Ky  
 // TODO: add construction code here, v;X'4/ M  
 // Place all significant initialization in InitInstance 87zsV/  
} -C wx %  
ZYoWz(  
CHookApp theApp;  q&0Jl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -A>1L@N  
{ *P&ZE   
 BOOL bProcessed=FALSE;  Hq h  
 if(HC_ACTION==nCode) *p{wC r  
 { D}l^ow  
  if((lParam&0xc0000000)==0xc0000000){// Key up 89:Ys=  
   switch(wParam) f5+a6s9  
   { QfJ?'*  
    case VK_MENU: P ?dE\Po7  
     MaskBits&=~ALTBIT; "gXz{$q  
     break; /i|T\  
    case VK_CONTROL: R_ojK&%  
     MaskBits&=~CTRLBIT; b>AFhj:  
     break; &Ib8xwb:  
    case VK_SHIFT: >h/J{T(P>h  
     MaskBits&=~SHIFTBIT; xt@zP)6G  
     break; ~HsPYc8Fz  
    default: //judge the key and send message .,[zI@9  
     break; ;w@PnY  
   } HONrt|c  
   for(int index=0;index<MAX_KEY;index++){ ;JMd(\+-  
    if(hCallWnd[index]==NULL) j"*ZS'0  
     continue; Pp1HOJYJp0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `<2y [<y  
    { MK 7S*N1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 't \:@-tQ  
     bProcessed=TRUE; ,9gyHQ~  
    } TOV531   
   } {~ ZSqd  
  } FLJdnL  
  else if((lParam&0xc000ffff)==1){ //Key down k6-Q3W[+a  
   switch(wParam) vRYQ4B4o  
   { -J4?Km  
    case VK_MENU: ^EE 3E'  
     MaskBits|=ALTBIT; Y[9x\6 _E  
     break; >I Aw Nr  
    case VK_CONTROL: l2KR=& SX/  
     MaskBits|=CTRLBIT; a0OH  
     break; Asicf{HaX  
    case VK_SHIFT: :BG/]7>|V  
     MaskBits|=SHIFTBIT; 9VdVom|e  
     break; ma>{((N  
    default: //judge the key and send message "0Uh(9Fv  
     break; ?as)vYP  
   } KHKf+^uu  
   for(int index=0;index<MAX_KEY;index++) x(h(a#,r  
   { D+d\<":  
    if(hCallWnd[index]==NULL) +Ck F#H ~  
     continue; h=um t<&D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rxjMCMF  
    { Mh>H5l.1i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ufm`h)N  
     bProcessed=TRUE; $+)2CXQe5  
    } ;|e{J$  
   } qYc]Y9fi  
  } 72@raA#y  
  if(!bProcessed){ \k_0wt2x1  
   for(int index=0;index<MAX_KEY;index++){ :<4:h.gO8  
    if(hCallWnd[index]==NULL) FW(y#Fmqs  
     continue; :Eq=wbAw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S#dkJu]]#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2628 c`  
   } Fyoy)y*  
  } gE]) z*tqX  
 } tpj({   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T (]  
} "knSc0 ,u  
W+V#z8K  
BOOL InitHotkey() Es6b~ #  
{ c%w@-n`  
 if(hHook!=NULL){ DesvnV'{`  
  nHookCount++; aN{C86wx  
  return TRUE; y-O# +{7  
 } 1[o] u:m9U  
 else ?#ue:O1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +lmMBjDa  
  if(hHook!=NULL) He="S3XON  
   nHookCount++; '$*d:1  
  return (hHook!=NULL); 1BUdl=o>S  
} {ecmOxKP}  
BOOL UnInit() 0{g@j{Lbz  
{ I^ sWf3'db  
 if(nHookCount>1){ TDXLxoC?  
  nHookCount--; "&%: 9O  
  return TRUE; 5*~Mv<#  
 } $8h^R#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |^Nz/PN  
 if(unhooked==TRUE){ p"f=[awp  
  nHookCount=0; -q\5)nY  
  hHook=NULL; 4Waot  
 } ^:W.R7|  
 return unhooked; %Uybp  
} gE%{#&*  
@@K@;Jox  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `X]TIMc:Ad  
{ betN-n-  
 BOOL bAdded=FALSE; ) \Mwv&k1  
 for(int index=0;index<MAX_KEY;index++){ K[Bq,nPo  
  if(hCallWnd[index]==0){ pZp|F  
   hCallWnd[index]=hWnd; qW[p .jN  
   HotKey[index]=cKey; ]C^D5(t/cd  
   HotKeyMask[index]=cMask; =A&x d"  
   bAdded=TRUE; NKB,D$!~&  
   KeyCount++; Y\luz`v  
   break; &n+3^JNl  
  } j%Mz;m4y  
 } P]gksts9f.  
 return bAdded; BFmYbK  
} i|+ EC_^<  
8`}(N^=}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z\6&5r=  
{ -=,%9r  
 BOOL bRemoved=FALSE; [?$ZB),L8  
 for(int index=0;index<MAX_KEY;index++){ t] LCe\#  
  if(hCallWnd[index]==hWnd){ |j53' >N[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -Qx:-,.a  
    hCallWnd[index]=NULL; 50% |9D0?Y  
    HotKey[index]=0; !U.Xb6  
    HotKeyMask[index]=0; 6T{Zee  
    bRemoved=TRUE; Z#YkAQHv5  
    KeyCount--; ! )$ PD@  
    break; O~F/{: U  
   } R>H*MvN  
  } <r]7xsr  
 } 2f(5C*~  
 return bRemoved; o8\@R  
} _l,?Y;OF  
c\~H_ ~F  
void VerifyWindow() bA\TuB  
{ Q/r0p>  
 for(int i=0;i<MAX_KEY;i++){ }ny ,Nl  
  if(hCallWnd!=NULL){ L'=2Uk#.D  
   if(!IsWindow(hCallWnd)){ ?P4@U9i  
    hCallWnd=NULL; -IhFPjQ  
    HotKey=0; $~c?qU  
    HotKeyMask=0; 3?I^D /K^  
    KeyCount--; 0/P!rH9  
   } iOz<n z  
  } yo*c& >  
 } MN\/F4Io  
} g/,fjM_  
oZ95)'L,  
BOOL CHookApp::InitInstance() KpBh@S  
{ I$0JAy  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7onMKMktM%  
 hins=AfxGetInstanceHandle(); Xm`s=5%  
 InitHotkey(); I7b(fc-r  
 return CWinApp::InitInstance(); ZxkX\gl91  
} )}L*8 LV  
YAnt}]u!"  
int CHookApp::ExitInstance() M iIH&z  
{ ;:1d<Q|  
 VerifyWindow(); 6W$ #`N>  
 UnInit(); `84pql,  
 return CWinApp::ExitInstance(); -'+|r]  
} eCdx(4(\a  
mLX1w)=r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |8}f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,}F2l|x_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *FDz20S  
#if _MSC_VER > 1000 QxvxeK!Y  
#pragma once ut%t`Y( ]  
#endif // _MSC_VER > 1000 2pFOC;tl  
c/ %5IhX?  
class CCaptureDlg : public CDialog 7r?O(0>  
{ K0 .f4 o  
 // Construction LB%_FT5  
 public: KY/}jJW  
  BOOL bTray; w~M5)b  
  BOOL bRegistered; KTxdZt  
  BOOL RegisterHotkey(); Nk=F.fp|/  
  UCHAR cKey; quk~z};R>\  
  UCHAR cMask; ^qqP):0y1V  
  void DeleteIcon(); RGYky3mQK  
  void AddIcon(); HRi~TZ?\  
  UINT nCount; $+Ke$fq.>  
  void SaveBmp(); E (tdL,m'  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor g(<02t!OT=  
  // Dialog Data d}tn/Eu?B  
  //{{AFX_DATA(CCaptureDlg) 9x.vz  
  enum { IDD = IDD_CAPTURE_DIALOG }; OqUEj 0X  
  CComboBox m_Key; ie^:PcU  
  BOOL m_bControl; >1:s.[&  
  BOOL m_bAlt; f|Kd{ $VO  
  BOOL m_bShift; 65AXUTg  
  CString m_Path; U,)Ngnd  
  CString m_Number; _v4TyJ  
  //}}AFX_DATA D.)$\Caq  
  // ClassWizard generated virtual function overrides k6rX/ocu  
  //{{AFX_VIRTUAL(CCaptureDlg) * JGm  
 public: iQ*JU2;7 t  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d+~c$(M)  
 protected: Gdnk1_D>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wE3^6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ba|x?kz  
  //}}AFX_VIRTUAL )/2* <jr  
  // Implementation jo=XxA  
 protected: y=YD4m2W  
  HICON m_hIcon; ? Ldw\  
  // Generated message map functions mU:C{<Z  
  //{{AFX_MSG(CCaptureDlg) tp$NT.z  
  virtual BOOL OnInitDialog(); >#dNXH]9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VA4vAF  
  afx_msg void OnPaint(); 5b9_6L6  
  afx_msg HCURSOR OnQueryDragIcon(); aAO[Y"-:,Y  
  virtual void OnCancel(); qhVDC  
  afx_msg void OnAbout(); KL*ZPKG  
  afx_msg void OnBrowse(); N^q*lV#kob  
  afx_msg void OnChange(); oTo'? E#  
 //}}AFX_MSG #0`2wuo {  
 DECLARE_MESSAGE_MAP() 6k"Wy3/  
}; xXH%7%W'f  
#endif l0Jpf9Aue  
l W'6rat  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KXcG;b[7n  
#include "stdafx.h" 7^Uv1ezDR  
#include "Capture.h" R+lKQAyC0=  
#include "CaptureDlg.h" hU5[k/ q  
#include <windowsx.h> )vO Zp&  
#pragma comment(lib,"hook.lib") ?yddr`?W  
#ifdef _DEBUG )z3mS2  
#define new DEBUG_NEW ^R1 nOo/  
#undef THIS_FILE  \A:m<::  
static char THIS_FILE[] = __FILE__; al=Dy60|z  
#endif bj(U?$  
#define IDM_SHELL WM_USER+1 eJE?H]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2f`u?T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gm8L5c V  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; BMU~1[r  
class CAboutDlg : public CDialog IvetQ+  
{ gd.P%KC!g  
 public: @z$V(}(O^  
  CAboutDlg(); ) !3XM  
  // Dialog Data Cst\_j  
  //{{AFX_DATA(CAboutDlg) Bcrd}'no  
  enum { IDD = IDD_ABOUTBOX }; zF<*h~  
  //}}AFX_DATA v[CX-CBZ?  
  // ClassWizard generated virtual function overrides -x3QgDno  
  //{{AFX_VIRTUAL(CAboutDlg) {#uX   
 protected: TuwH?{ FzK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o; 6\  
  //}}AFX_VIRTUAL Po&gr@e.V  
  // Implementation $J[h(>-X  
 protected: FOB9CsMe  
  //{{AFX_MSG(CAboutDlg) 1>b kVA  
  //}}AFX_MSG Y%p"RB[  
  DECLARE_MESSAGE_MAP() tb AN{pX  
}; ~zRUJ2hD!  
PmvTCfsg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ho#] ?Z#  
{ B^U5= L[:p  
 //{{AFX_DATA_INIT(CAboutDlg) HYLU]9aH8  
 //}}AFX_DATA_INIT ?F*gFW_k  
} ^o!K0 t*  
f|?i6.N> f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V;=SncUb  
{ RK/SeS  
 CDialog::DoDataExchange(pDX); ma~WJ0LM\  
 //{{AFX_DATA_MAP(CAboutDlg) y_qFXd  
 //}}AFX_DATA_MAP J\_tigd   
} (o{QSk\  
vb9G_Pfz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "pdG%$  
 //{{AFX_MSG_MAP(CAboutDlg) _zJY1cr  
 // No message handlers "6 dC  
 //}}AFX_MSG_MAP + R])u5c'  
END_MESSAGE_MAP() 4xT(Uj  
PQ@(p%   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [rU8%  
: CDialog(CCaptureDlg::IDD, pParent) ?.|qRzWL  
{ )oG_x{  
 //{{AFX_DATA_INIT(CCaptureDlg) GUmOK=D >  
  m_bControl = FALSE; M^mS#<!y  
  m_bAlt = FALSE; oQ8W0`bZa  
  m_bShift = FALSE; @luv;X^%  
  m_Path = _T("c:\\"); 3 _:yHwkD  
  m_Number = _T("0 picture captured."); j?/T7a^  
  nCount=0; W)<us?5Ec5  
  bRegistered=FALSE; $4>K2  
  bTray=FALSE; p:k>!8.Qho  
 //}}AFX_DATA_INIT Wh(V?!^@5  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2<fG= I8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?b2"~A  
} -nN}8&l  
 s4;SA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) q3T'rw%Eh  
{ ?5'UrqYSW  
 CDialog::DoDataExchange(pDX); 1`5d~>fV  
 //{{AFX_DATA_MAP(CCaptureDlg) qW][Q%'lt  
  DDX_Control(pDX, IDC_KEY, m_Key); vNd4Fn)H  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); TTmNPp4q  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `DC)U1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); G~8C7$0z  
  DDX_Text(pDX, IDC_PATH, m_Path); ~7 C` a$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fph*|T&R  
 //}}AFX_DATA_MAP epW;]> l  
} -2K`:}\y&  
9w}A7('  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8D)*~C'85E  
//{{AFX_MSG_MAP(CCaptureDlg) -HP [IJP  
 ON_WM_SYSCOMMAND() $?(fiFC  
 ON_WM_PAINT() ss236&  
 ON_WM_QUERYDRAGICON() x76<u:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) '2/48j X5  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }7X85@jC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]|Vm*zO  
//}}AFX_MSG_MAP wB?;3lTS  
END_MESSAGE_MAP() 7od!:<v/  
{#zJx(2yG  
BOOL CCaptureDlg::OnInitDialog() C \H%4p1r  
{ fE|([ ` !  
 CDialog::OnInitDialog(); M!,$i  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Y=x]'3}^  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7zgU>$i  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .^l;3*X@  
 if (pSysMenu != NULL) ?X]7jH<iw;  
 { d; oaG (e  
  CString strAboutMenu; H^B/ '#mO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^WVH z;  
  if (!strAboutMenu.IsEmpty()) (4>k+ H  
  { j Bl I^  
   pSysMenu->AppendMenu(MF_SEPARATOR); +g/y)]AP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |B;:Ald  
  } V!DQ_T+a  
 } Fj7cI +  
 SetIcon(m_hIcon, TRUE); // Set big icon (m-(5 CaJ  
 SetIcon(m_hIcon, FALSE); // Set small icon D5]T.8kX(7  
 m_Key.SetCurSel(0); O6YYOmt3  
 RegisterHotkey(); .?<,J  
 CMenu* pMenu=GetSystemMenu(FALSE); -wW%+wH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U5Q `r7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7$\;G82_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wX<)Fj'  
 return TRUE; // return TRUE unless you set the focus to a control bv4lgRE6Y  
} }Rt?p8p  
=sG  C  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B7fURL Rqr  
{ Z<0M_q9?MO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'eLO#1Ipf  
 { wg<DV!GZ  
  CAboutDlg dlgAbout; H`9E_[  
  dlgAbout.DoModal(); Wepa;  
 } E/Q[J.$o  
 else z$QYl*F1  
 { TF^Rh4  
  CDialog::OnSysCommand(nID, lParam); # yAt `  
 } {}s7q|$  
} K!).QB'  
("}TW-r~  
void CCaptureDlg::OnPaint() }(hx$G^M  
{ 2x"&8Bg3  
 if (IsIconic()) 4@.qM6 \\q  
 { 7Fh%jRHZ`  
  CPaintDC dc(this); // device context for painting G9 ;X=c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N*f?A$u/I  
  // Center icon in client rectangle lOCMKaCD  
  int cxIcon = GetSystemMetrics(SM_CXICON); 'hf#Q9W5  
  int cyIcon = GetSystemMetrics(SM_CYICON); >j4;{r+eQw  
  CRect rect; fx_7X15  
  GetClientRect(&rect); VEkv JX.  
  int x = (rect.Width() - cxIcon + 1) / 2; 3T'9_v[Y  
  int y = (rect.Height() - cyIcon + 1) / 2; JpcG5gX^B  
  // Draw the icon p[!&D}&6h  
  dc.DrawIcon(x, y, m_hIcon); 7ykpDl^@  
 } Z_zN:BJ8L  
 else %u, H2 *  
 { Ovq-rI{  
  CDialog::OnPaint(); A% -*M 'J  
 } z|Q)^  
} }G]6Rip 3  
#e}Q|pF  
HCURSOR CCaptureDlg::OnQueryDragIcon() $>hPB[[  
{ `k+ci7;  
 return (HCURSOR) m_hIcon; `1=n H/E  
} H!y1&  
etMQy6E\  
void CCaptureDlg::OnCancel() 'P0:1">  
{ `WboM\u  
 if(bTray) Rp^k D ,*  
  DeleteIcon(); h#dp_#  
  CDialog::OnCancel(); *?zmo@-  
} _K<H*R  
A_tdtN<  
void CCaptureDlg::OnAbout() >=G;rs  
{ tda#9i[pkH  
 CAboutDlg dlg; -,)&?S  
 dlg.DoModal(); -y|>#`T/  
} &G\Vn,1v  
X4_1kY;  
void CCaptureDlg::OnBrowse() tg_xk+x  
{ ]0p] u d&  
 CString str; F0t-b%w,  
 BROWSEINFO bi; I<L  
 char name[MAX_PATH]; Y``50{7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -GJ~xcf0  
 bi.hwndOwner=GetSafeHwnd(); ~2PD%+e7]  
 bi.pszDisplayName=name; s;Q0  
 bi.lpszTitle="Select folder"; `|)V]<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; HL]8E}e\"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t6DgWKT6  
 if(idl==NULL) j #G4A%_  
  return; rE$0a-d2B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8s16yuM  
 str.ReleaseBuffer(); BpBMFEiP  
 m_Path=str; ~_6~Fi  
 if(str.GetAt(str.GetLength()-1)!='\\') cc- liY "  
  m_Path+="\\"; .)59*'0  
 UpdateData(FALSE); ,P ~jO  
} 'i+j;.  
\NU^Jc_k7  
void CCaptureDlg::SaveBmp() :%7y6V*  
{ T&+*dyNxMK  
 CDC dc;  UCV1{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !0!m |^c5  
 CBitmap bm; $ha,DlN  
 int Width=GetSystemMetrics(SM_CXSCREEN);  vX1 8 ]  
 int Height=GetSystemMetrics(SM_CYSCREEN); B6ee\23  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C$WUg<kcK'  
 CDC tdc; "'U+T:S  
 tdc.CreateCompatibleDC(&dc); N!!=9'fGF  
 CBitmap*pOld=tdc.SelectObject(&bm); opsjei@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xl2;DFiYt  
 tdc.SelectObject(pOld); %])U(  
 BITMAP btm; w_qX~d/  
 bm.GetBitmap(&btm); V1di#i:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o-i9 :AHs  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .3>`yL  
 BITMAPINFOHEADER bih; iOY: a  
 bih.biBitCount=btm.bmBitsPixel; uJ-Q]yQ  
 bih.biClrImportant=0; A\ARjSdb  
 bih.biClrUsed=0; '^B[Krs'Z`  
 bih.biCompression=0; Cq8.^=}_  
 bih.biHeight=btm.bmHeight; 8! eYax   
 bih.biPlanes=1; [GQn1ZLc  
 bih.biSize=sizeof(BITMAPINFOHEADER); FxU a5 n  
 bih.biSizeImage=size; Fi)(~ji:  
 bih.biWidth=btm.bmWidth; RK )1@Tz7!  
 bih.biXPelsPerMeter=0; 8k +^jj  
 bih.biYPelsPerMeter=0; |ht:_l 8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Lmsc ~~  
 static int filecount=0; tE'^O< K  
 CString name; DpQ\q;  
 name.Format("pict%04d.bmp",filecount++); Br4[hUV/  
 name=m_Path+name; Y % 9$!  
 BITMAPFILEHEADER bfh; B']-4X{SGa  
 bfh.bfReserved1=bfh.bfReserved2=0; fk&>2[^&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); rj}O2~W~4  
 bfh.bfSize=54+size; >PuQ{T I  
 bfh.bfOffBits=54; hZ_@U?^  
 CFile bf; q"(b}3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){  )OHGg  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #{_iNra9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (vP<}  
  bf.WriteHuge(lpData,size); 2$r8^}Nj?  
  bf.Close(); G+7#!y Y  
  nCount++; |P0!dt7sQ  
 } n f.H0i;  
 GlobalFreePtr(lpData); ,>+B>lbJ*  
 if(nCount==1) *'w?j)}A9g  
  m_Number.Format("%d picture captured.",nCount); Zzn N"Si,  
 else 9$k0  
  m_Number.Format("%d pictures captured.",nCount); ~Y/:]&wF  
  UpdateData(FALSE); OEw#;l4 C  
} {ty)2  
%lq[,6?>5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9Js+*,t  
{ w)N~u%  
 if(pMsg -> message == WM_KEYDOWN) :a/l9 m(  
 { O NVhB  
  if(pMsg -> wParam == VK_ESCAPE) y%Rq6P=4Q  
   return TRUE; hsB3zqotF  
  if(pMsg -> wParam == VK_RETURN) `%A vn<  
   return TRUE; ]A%]W^G  
 } :W^\ } UX4  
 return CDialog::PreTranslateMessage(pMsg); CY~ S{w  
} 1-V"uLy@gC  
D*&#}c,*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) GJ5R <f9I  
{ s Poh\n  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J6 J">  
  SaveBmp(); ?wP/l  
  return FALSE; ]!q>@b  
} }7*|s+F(f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 'B:8tv  
 CMenu pop; (/7b8)g  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); o_8Wnx^  
 CMenu*pMenu=pop.GetSubMenu(0); &%]v0QK  
 pMenu->SetDefaultItem(ID_EXITICON); [*C%u_h  
 CPoint pt;  WD55(  
 GetCursorPos(&pt); x8w l  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2##;[  
 if(id==ID_EXITICON) *8r^!(Kj  
  DeleteIcon(); `>0%Ha   
 else if(id==ID_EXIT) 577#A,O  
  OnCancel(); 3n,jrX75u  
 return FALSE; cO$xT;kK  
} !>\&*h-Cm#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5^D094J|^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ZIN1y;dJ  
 AddIcon(); nll=Vd[  
 return res; i 50E#+E8  
} 7KesfH?  
G2<$to~{  
void CCaptureDlg::AddIcon() vHZq z<  
{ IaZmN.k*  
 NOTIFYICONDATA data; L{&>,ww  
 data.cbSize=sizeof(NOTIFYICONDATA); V0NLwl O  
 CString tip; wBDHhXi0  
 tip.LoadString(IDS_ICONTIP); 0!-'4+"  
 data.hIcon=GetIcon(0); ebn3r:IU-  
 data.hWnd=GetSafeHwnd(); E{0e5.{  
 strcpy(data.szTip,tip); 5vFM0  
 data.uCallbackMessage=IDM_SHELL;  zo1T`"Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; inY_cn?  
 data.uID=98; 0W0GSDx  
 Shell_NotifyIcon(NIM_ADD,&data); 3! #|hI>f  
 ShowWindow(SW_HIDE); ;A4qE W  
 bTray=TRUE; egK~w8`W%  
} "cyRzQ6EH  
iX o(  
void CCaptureDlg::DeleteIcon() Atb`Q'Yrw  
{ K@<*m!%<2  
 NOTIFYICONDATA data; IsmZEVuC  
 data.cbSize=sizeof(NOTIFYICONDATA); wFF,rUV  
 data.hWnd=GetSafeHwnd(); 3?K+wg s  
 data.uID=98; 6cd!;Ca  
 Shell_NotifyIcon(NIM_DELETE,&data); zMRa <G7  
 ShowWindow(SW_SHOW); tm/=Oc1p  
 SetForegroundWindow(); \=D+7'3  
 ShowWindow(SW_SHOWNORMAL); +oh|r'~  
 bTray=FALSE; Nyt*mbd5 {  
} ~j>yQ%[v  
9N `WT=  
void CCaptureDlg::OnChange() {+zG.1o^  
{ V:#rY5X  
 RegisterHotkey(); gg.]\#3g  
} & #JYh=#  
<THw l/a  
BOOL CCaptureDlg::RegisterHotkey() oi]XSh[_s  
{ gzlxkv-F{  
 UpdateData(); O&MH5^I  
 UCHAR mask=0; 5kGQf  
 UCHAR key=0; A@Q6}ESD  
 if(m_bControl) Td,d9M  
  mask|=4; 4qQE9f xdY  
 if(m_bAlt) s >:gL,%c  
  mask|=2; /Yb8= eM  
 if(m_bShift) tmOy"mq67  
  mask|=1; !KJA)znx;(  
  key=Key_Table[m_Key.GetCurSel()]; Y(t /=3c[  
 if(bRegistered){ X&HYWH'@,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); - . o,bg  
  bRegistered=FALSE; Rz&`L8Bz  
 } kQe<a1 8  
 cMask=mask; r&Nh>6<&/  
 cKey=key; w+"E{#N  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lX%-oRQ/os  
 return bRegistered; *= O]^|]2  
} 9+MW13?  
=dH=3iCG  
  四、小结 SHs [te[  
V,=5}qozQ  
  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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