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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: /4_}wi\  
  Hkg@M?(  
  一、实现方法 `W]a @\EYA  
J3:P/n&  
  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: /;OJ=x3i  
4 T^M@+&|  
#pragma data_seg("shareddata") m9L+|r  
HHOOK hHook =NULL; //钩子句柄 cYbO)?mC_  
UINT nHookCount =0; //挂接的程序数目 Ku&(+e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;Ly4Z*!2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o8s&n3mY}y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }rO4b>J  
static int KeyCount =0; *s%s|/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xje{ kx#  
#pragma data_seg() aNq Vs|H  
ise@,[!  
  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。 {;p /V\   
:+R5"my  
  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: Fn[~5/  
s &.Z;X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR qL'3MY.!  
cKey,UCHAR cMask) ux =a9  
{ CC)9Ks\  
 BOOL bAdded=FALSE; wz, \zh  
 for(int index=0;index<MAX_KEY;index++){ 'R'>`?Nh  
  if(hCallWnd[index]==0){ KDXo9FzF  
   hCallWnd[index]=hWnd; {xH \!!"T  
   HotKey[index]=cKey; ,7QnZ=F  
   HotKeyMask[index]=cMask; 3YLnh@-  
   bAdded=TRUE; NGze: gPmO  
   KeyCount++; TM"-X\e~{  
   break; 5=?&q 'i  
  } mD=?C  
 } $< aBawLZO  
 return bAdded; #ERn 8k  
} P\M+Z A ;  
//删除热键 cYp}$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @i`gR%  
{ {$EXI]f  
 BOOL bRemoved=FALSE; kl={L{r  
 for(int index=0;index<MAX_KEY;index++){ lyi}q"Kn*;  
  if(hCallWnd[index]==hWnd){ q@\_q!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )8<X6  
    hCallWnd[index]=NULL; fC-^[Af)  
    HotKey[index]=0; Ym6ec|9;  
    HotKeyMask[index]=0; H 0h  
    bRemoved=TRUE; ?k3b\E3  
    KeyCount--; l~=iUZW<  
    break; $` oA$E3  
   } bo*q{@Ue  
  } /Mk)H d  
 } UP`q6] P  
 return bRemoved; ry T8*}o  
} 4ku/3/ 6  
OM.^>=  
PWmz7*/  
  DLL中的钩子函数如下: F9<OKcXH  
7*5ctc!dG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yjr@v!o  
{ j~8+,:  
 BOOL bProcessed=FALSE; ku{aOV%  
 if(HC_ACTION==nCode) U\ L"\N7  
 { R#`itIYh  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 j*zK"n  
   switch(wParam) }ot _k-  
   {  9?:S:Sq  
    case VK_MENU: 6a@~;!GlI  
     MaskBits&=~ALTBIT; S?{5DxilO  
     break; ;FmSL#]I  
    case VK_CONTROL: 4 * OU  
     MaskBits&=~CTRLBIT; >ob/@  
     break; Z~uKT n  
    case VK_SHIFT: % n{W  
     MaskBits&=~SHIFTBIT; wI4;/w>  
     break; /OP*ARoC21  
    default: //judge the key and send message yRYWx` G  
     break; bxN;"{>Xz  
   } 3wE8y&  
   for(int index=0;index<MAX_KEY;index++){ lP e$AI  
    if(hCallWnd[index]==NULL) 6:,^CI|@ t  
     continue; mQs$7t[>t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (*ng$z Z$  
    { E8i:ER $$7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5\S7Va;W  
     bProcessed=TRUE; [*G2wP[$  
    } X{ =[q|P  
   } DSC4  
  } G|lI=Q3f  
  else if((lParam&0xc000ffff)==1){ //有键按下 h7$!wf!I  
   switch(wParam) (Pd>*G\  
   { l:eNu}{&  
    case VK_MENU: ='0!B]<G  
     MaskBits|=ALTBIT; !cb#fl  
     break; 0I((UA/7Zs  
    case VK_CONTROL: BcLt95;.\  
     MaskBits|=CTRLBIT; sQZ8<DpB  
     break; 1%"` =$q%  
    case VK_SHIFT: }^[@m#  
     MaskBits|=SHIFTBIT; Bs?F*,zDJ  
     break; [MS.5+1Y  
    default: //judge the key and send message QNXxpoS#  
     break; zfb _ )  
   } 1RbYPX  
   for(int index=0;index<MAX_KEY;index++){ !h!9SE  
    if(hCallWnd[index]==NULL) 3.X0!M;x  
     continue; %KF:- w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *]WXM.R8  
    { %>2t=)T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <y!r~?  
     bProcessed=TRUE; ok[=1gA#h  
    } &|}IBu:T  
   } |nN/x<v  
  } FH8mK)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )V3(nZY  
   for(int index=0;index<MAX_KEY;index++){ cl{W]4*$  
    if(hCallWnd[index]==NULL) oh~ vo!  
     continue; /dt!J `:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jHH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "GI&S%F  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6 v^  
   } <C%-IZv$  
  } 8$ZSF92C  
 } WWW#s gM%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \Z20fh2  
} 3C=clB9<  
h5rP]dbhXU  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: otf%kG w  
BddECY,z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N5s|a5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6BU0hV  
ZT"|o\G^Q  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ](>7h _2B  
)_*a7N!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eM=)>zl  
{ @gSFvb bc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) D4Y!,7WEVt  
 { LQ\ ELJj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;Z1U@2./  
  SaveBmp(); * \o$-6<  
  return FALSE; e=o{Zo?H=  
 } {L4>2rF  
 …… //其它处理及默认处理 r@[VY g~  
} _Sgk^i3v  
M=[q+A  
b q3fiT9  
  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。 5m.KtnT)  
+yb$[E*  
  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。 qIGu#zXW  
J'ZFIT_>  
  二、编程步骤 6"Lsui??  
~"q,<t  
  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"; 40Qzo%eL  
hG~]~ )  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $;2eH  
52MCUl  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ra%R:xX  
A_jB|<bjTP  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; < [S1_2b.t  
I*W9VhIOV  
  5、 添加代码,编译运行程序。 -S,ir  
Ukx/jNyYv  
三、程序代码 7"n1it[RJ8  
c. TB8Ol  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL otz_nF;E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) lv00sa2z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yF/< :  
#if _MSC_VER > 1000 (Gi+7GMV'  
#pragma once ,"N3k(g  
#endif // _MSC_VER > 1000 i_0 ,BV C  
#ifndef __AFXWIN_H__ :!I)r$  
#error include 'stdafx.h' before including this file for PCH !#c[~erNZ  
#endif s-GleX<  
#include "resource.h" // main symbols @cu}3>  
class CHookApp : public CWinApp kj{rk^x  
{ 5:l*Ib:s7  
 public: EtR@sJ<  
  CHookApp(); V#zhG AMy.  
  // Overrides /OhaERv  
  // ClassWizard generated virtual function overrides xH"W}-#[  
  //{{AFX_VIRTUAL(CHookApp) D%jD 8p  
 public: |D;"D  
  virtual BOOL InitInstance(); 6+Wr6'kuH  
  virtual int ExitInstance(); ol?z<53X]  
  //}}AFX_VIRTUAL :7$\X[  
  //{{AFX_MSG(CHookApp) t,=@hs hN  
  // NOTE - the ClassWizard will add and remove member functions here. wR Xn9  
  // DO NOT EDIT what you see in these blocks of generated code ! X(r)Z\  
  //}}AFX_MSG $Yx6#m}[M  
  DECLARE_MESSAGE_MAP() (#j2P0B  
}; <\1}@?NGC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Ad]<e?oN=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x{NNx:T1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U`bC>sCp  
BOOL InitHotkey(); i{ t TUA  
BOOL UnInit(); =2RhPD  
#endif ASzzBR;?_  
CB*`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Y )u_nn'[  
#include "stdafx.h" e9~cBG|  
#include "hook.h" ' "ZRD_"  
#include <windowsx.h> Y<p zy8z  
#ifdef _DEBUG JqI6k6~Q^  
#define new DEBUG_NEW IF&g.R  
#undef THIS_FILE -yX.Jv  
static char THIS_FILE[] = __FILE__; ~In{lQ[QX  
#endif 0Jm]f/iZ  
#define MAX_KEY 100 tA`mD>[  
#define CTRLBIT 0x04 *Rz{44LP&  
#define ALTBIT 0x02 {l0,T0  
#define SHIFTBIT 0x01 ftYR,!&  
#pragma data_seg("shareddata") _MM   
HHOOK hHook =NULL; 8ivRp<9  
UINT nHookCount =0; 'RDWU7c9]  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0zeUP {MQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p>k]C:h  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vP3K7En  
static int KeyCount =0; tO?21?AD D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "DVt3E  
#pragma data_seg() uew0R;+oa  
HINSTANCE hins; {iA^rv|  
void VerifyWindow(); :fxWz%t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >?S\~Y  
//{{AFX_MSG_MAP(CHookApp) rs[?v*R74  
// NOTE - the ClassWizard will add and remove mapping macros here. :&Qb>PH[  
// DO NOT EDIT what you see in these blocks of generated code! &g*klt'B  
//}}AFX_MSG_MAP .D+RLO z  
END_MESSAGE_MAP() WI,40&<  
;LHDh_.pX  
CHookApp::CHookApp() W;^N8ap%  
{ t Y{; U#9  
 // TODO: add construction code here, fucUwf\_  
 // Place all significant initialization in InitInstance N1PECLS?  
} 6dF$?I&  
<e'P%tG'  
CHookApp theApp; 2*+ 3Rr J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BRe{1i 6  
{ F vj{@B!  
 BOOL bProcessed=FALSE; .FuA;:@%\  
 if(HC_ACTION==nCode) /Z:N8e  
 { $9G3LgcS  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zotz?j VVr  
   switch(wParam) f:xUPH?+  
   { iDZrK%f l  
    case VK_MENU: !~kEtC  
     MaskBits&=~ALTBIT; ,aI,2U91  
     break; xFOBF")  
    case VK_CONTROL: !;i*\ a  
     MaskBits&=~CTRLBIT; h9)RJSF4  
     break; Po> e kz_E  
    case VK_SHIFT: PJCnud F  
     MaskBits&=~SHIFTBIT; |Td_S|:d  
     break; |H:<:*=6c  
    default: //judge the key and send message ai4PM b$p  
     break; d^tVD`Fm  
   } VQ2Fnb4  
   for(int index=0;index<MAX_KEY;index++){ =:4?>2)  
    if(hCallWnd[index]==NULL) QeL{Wa-2F  
     continue; WJAYM2 6\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fqo&3+J4  
    { d4J<,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u)7*Rj^  
     bProcessed=TRUE; zwnw'  
    } IdF$Ml#[h  
   } 0rcjorWI  
  } or7pJy%4"  
  else if((lParam&0xc000ffff)==1){ //Key down IQIbz{bMx  
   switch(wParam) _e*c  
   { AQe!Sqg'  
    case VK_MENU: XoJgs$3B  
     MaskBits|=ALTBIT; /tP7uVL R  
     break; b"t")U==  
    case VK_CONTROL: )=Zsv40O  
     MaskBits|=CTRLBIT; AeaPK  
     break; 9 Va40X1  
    case VK_SHIFT: P% Q@9kO>  
     MaskBits|=SHIFTBIT;  \dTQQ  
     break; awFhz 6   
    default: //judge the key and send message ywEDy|Wn$~  
     break; 6Hwxx5>r  
   } fe';b[q)#  
   for(int index=0;index<MAX_KEY;index++) #d% vT!Bz~  
   { UQ~4c,  
    if(hCallWnd[index]==NULL) s@s/ '^`  
     continue; P_}/#N{C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )tD6=Iz^5  
    { ~0ooRUWU7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ft) lp>3gv  
     bProcessed=TRUE; Af9+HI O  
    } "5}%"-#  
   } ]n5"Z,K  
  } # kEOKmO  
  if(!bProcessed){ TP{Gt.e  
   for(int index=0;index<MAX_KEY;index++){ t:=k)B  
    if(hCallWnd[index]==NULL) \TUE<<?1s  
     continue; sPy2/7Wqd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) } L <,eV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); { 5-zyE  
   } qg4fR' i  
  } ~ezCu_  
 } /$:U$JVb?l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Sdx Y>;  
} LN^UC$[tk  
m?;$;x~Dj  
BOOL InitHotkey() ` 8UWE {  
{ j#VIHCzlr  
 if(hHook!=NULL){ E:w:4[neh  
  nHookCount++; JKy#j g:#  
  return TRUE; Us-A+)r*!  
 } Hbk&6kS  
 else C(o.Cy6  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h!e2 +4{4{  
  if(hHook!=NULL) .45^=2NGmQ  
   nHookCount++; RqLNp?V%  
  return (hHook!=NULL); bxwkTKr'  
} 7Ms90oE/c  
BOOL UnInit() V7C1FV2  
{ C),7- ?  
 if(nHookCount>1){ #)] c0]p  
  nHookCount--; 62kb2C  
  return TRUE; %LQ/q 3?_  
 } >vujZw_0>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _faJB@a_  
 if(unhooked==TRUE){ 2*u.3,aW  
  nHookCount=0; J#aVo &.Y  
  hHook=NULL; U -EhPAB@  
 } ia4k:\  
 return unhooked; O k7zpq  
} QU/3X 1W  
eOnT W4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Oq+E6"<y;?  
{ xU}M;4kH~  
 BOOL bAdded=FALSE; [U.v:tR   
 for(int index=0;index<MAX_KEY;index++){ ;S JF%@x  
  if(hCallWnd[index]==0){ i8~ r  
   hCallWnd[index]=hWnd; [w+Q^\%bN  
   HotKey[index]=cKey; )X5(#E  
   HotKeyMask[index]=cMask; hz\WZ^  
   bAdded=TRUE; `#6x=24  
   KeyCount++; T?npQA07=  
   break; Sj-[%D*  
  } #$'FSy#  
 } 6>DLp}d  
 return bAdded; Bo r7]#  
} kNPDm6m  
;%zC@a~{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;h~er6&   
{ ^o d<JD4  
 BOOL bRemoved=FALSE; AhxGj+  
 for(int index=0;index<MAX_KEY;index++){ q`Q}yE> 9  
  if(hCallWnd[index]==hWnd){ 9.&mz}q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v01#>,R  
    hCallWnd[index]=NULL; >I<PO.c!  
    HotKey[index]=0; $}tjS3klr  
    HotKeyMask[index]=0; uZ(? >  
    bRemoved=TRUE; (V?@?25  
    KeyCount--; <KQ(c`KW7  
    break; @Zm J z  
   } ?CY1]d  
  } 8eyl,W=dn  
 } u^4h&fL  
 return bRemoved; #I%s 3  
} z~Na-N  
Q_O*oT(0  
void VerifyWindow() '*R%^RK  
{ -]XP2}#d  
 for(int i=0;i<MAX_KEY;i++){ &88oB6$D^q  
  if(hCallWnd!=NULL){ Rs7 |}Dl}  
   if(!IsWindow(hCallWnd)){ tcL2J.  
    hCallWnd=NULL; ebM{OI  
    HotKey=0; =+oZtP-+o  
    HotKeyMask=0; &Lt@} 7$8  
    KeyCount--; ]vo_gKZ  
   } =~|:t&v=c  
  } 3f&|h^\nD  
 } %l$W*.j|;  
} &; >4N"]  
;n*J$B  
BOOL CHookApp::InitInstance() h$fe -G#  
{ +jV_Wz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )2.)3w1_4  
 hins=AfxGetInstanceHandle(); @8gEH+r  
 InitHotkey(); EUcKN1  
 return CWinApp::InitInstance(); -:`V<   
} JwP:2-o  
_T*AC.  
int CHookApp::ExitInstance() geGeZ5+B  
{ `X -<$x  
 VerifyWindow(); 8cdsToF(e.  
 UnInit(); !7 _\P7M  
 return CWinApp::ExitInstance(); #n7Yr,|Z  
} FvXqggfGv  
pP.'wSj  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lLiQ;@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nSS=%,?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ m<@z}%v-  
#if _MSC_VER > 1000 /A07s[L  
#pragma once RKuqx:U  
#endif // _MSC_VER > 1000 ];FtS>\x  
xRxy|x[  
class CCaptureDlg : public CDialog 3S"] u}  
{ oXgdLtsu  
 // Construction jk7 0u[\  
 public:  (^: p  
  BOOL bTray; BIMKsF Zt  
  BOOL bRegistered; \}dyS8  
  BOOL RegisterHotkey(); ~W{-Q.  
  UCHAR cKey; _vl}*/=Hc  
  UCHAR cMask; nWaNT-  
  void DeleteIcon(); =G${[V \  
  void AddIcon();  ^jyD#  
  UINT nCount; |>1hu1  
  void SaveBmp(); npH?4S-8G  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .<&s%{EW  
  // Dialog Data O)#U ^  
  //{{AFX_DATA(CCaptureDlg) 6"QEJ  
  enum { IDD = IDD_CAPTURE_DIALOG }; aV|9H  
  CComboBox m_Key; *e{PxaF!C  
  BOOL m_bControl; o0I9M?lP  
  BOOL m_bAlt; jRj=Awy  
  BOOL m_bShift; ` \ZqgX4  
  CString m_Path; 6X_\Ve  
  CString m_Number; "(TkJbwC[  
  //}}AFX_DATA b2) \ MNH  
  // ClassWizard generated virtual function overrides X0$@Ik  
  //{{AFX_VIRTUAL(CCaptureDlg) <bUe/m  
 public: B3 zk(RNZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); w{,4rk;Hr  
 protected: @WOM#Kc  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l-)B ivoi  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [EZYsOr.  
  //}}AFX_VIRTUAL JK)qZ=  
  // Implementation s] au/T6b  
 protected: E^V |  
  HICON m_hIcon; w"zE_9I\  
  // Generated message map functions $yb@ Hhx>  
  //{{AFX_MSG(CCaptureDlg) d8x%SQ!V  
  virtual BOOL OnInitDialog(); W>-B [5O&[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); WlVl[/qt  
  afx_msg void OnPaint(); p{tK_ZBy]c  
  afx_msg HCURSOR OnQueryDragIcon(); p,!$/Q+l  
  virtual void OnCancel(); ZxHJ<2oD  
  afx_msg void OnAbout(); oy\B;aAK  
  afx_msg void OnBrowse(); Y`ihi,s`H  
  afx_msg void OnChange(); vmZ"o9-{#X  
 //}}AFX_MSG ?dq#e9  
 DECLARE_MESSAGE_MAP() $:bih4 @>  
}; \~DM   
#endif Le#spvV3J|  
FfFak@H  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :0~QRc-u  
#include "stdafx.h" {|<"C?  
#include "Capture.h" *dsX#Iz  
#include "CaptureDlg.h" 7&%^>PU7  
#include <windowsx.h> c:4P%({  
#pragma comment(lib,"hook.lib") TwahR:T   
#ifdef _DEBUG 5J.0&Dda  
#define new DEBUG_NEW zF&=U`v  
#undef THIS_FILE MQTdk*L_]  
static char THIS_FILE[] = __FILE__; q9*MNHg }  
#endif smy}3k  
#define IDM_SHELL WM_USER+1 L ^J- ("e_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dF@)M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YZwaD b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [ !%R#+o=F  
class CAboutDlg : public CDialog p3x?[ Ww  
{ Tx>K:`oB  
 public: O l@_(U  
  CAboutDlg(); 2KJ1V+g@a6  
  // Dialog Data <z)m%*lvU  
  //{{AFX_DATA(CAboutDlg) ]N)DS+V/  
  enum { IDD = IDD_ABOUTBOX }; z~oDWANP  
  //}}AFX_DATA kdrod[S  
  // ClassWizard generated virtual function overrides ]7YNIS  
  //{{AFX_VIRTUAL(CAboutDlg) 9^ed-h Bf  
 protected: iLX_T]1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "M H6fF  
  //}}AFX_VIRTUAL zqySm) o]  
  // Implementation C*kK)6v `  
 protected: LF<wt2?*  
  //{{AFX_MSG(CAboutDlg) Hh[Tw&J4  
  //}}AFX_MSG nD6G  
  DECLARE_MESSAGE_MAP() :7.Me ;RA  
}; S;\R!%t_  
{3\R|tZh,`  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Pcd *">v  
{ e{w>%)rcP  
 //{{AFX_DATA_INIT(CAboutDlg) Ty4S~ClO#'  
 //}}AFX_DATA_INIT A#@_V'a8  
} Qs 2.ef?  
;O#g"8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |`rJJFA  
{ ~W#sTrK  
 CDialog::DoDataExchange(pDX); !X^Ce)1K  
 //{{AFX_DATA_MAP(CAboutDlg) &Z("D7.G  
 //}}AFX_DATA_MAP 8/%6@Y"Y*  
} Y}G_Z#-!  
v syWm.E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3c'#6virz  
 //{{AFX_MSG_MAP(CAboutDlg) #Z,E><t  
 // No message handlers rxZi8w>}  
 //}}AFX_MSG_MAP QV|>4^1D  
END_MESSAGE_MAP() db72W x0>  
t;qP']2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [3/VCYje  
: CDialog(CCaptureDlg::IDD, pParent) (GK pA}~R  
{ :%r S =f  
 //{{AFX_DATA_INIT(CCaptureDlg) w`HI]{hE~N  
  m_bControl = FALSE; R=)55qu  
  m_bAlt = FALSE; [j,txe?n  
  m_bShift = FALSE; <O~WB  
  m_Path = _T("c:\\"); %CnxjtTo  
  m_Number = _T("0 picture captured."); =6 r:A<F!n  
  nCount=0; *<4Em{rZ5  
  bRegistered=FALSE; a|j%n  
  bTray=FALSE; qi[Z,&  
 //}}AFX_DATA_INIT `u'bRp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %8.J=B  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |pZUlQbb  
} Gc tsp2ndW  
afEF]i  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;\;M =&{}  
{ []kN16F  
 CDialog::DoDataExchange(pDX); 9]'&RyH=#  
 //{{AFX_DATA_MAP(CCaptureDlg) D1s4`V -  
  DDX_Control(pDX, IDC_KEY, m_Key); N!&:rK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); F'm(8/A$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1=}qBR#scY  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bJ /5|E?  
  DDX_Text(pDX, IDC_PATH, m_Path); AvJ,SQt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &K+0xnUH  
 //}}AFX_DATA_MAP !]` #JAL7  
} -Sv"gLB  
n'FwM\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R,2P3lv1v@  
//{{AFX_MSG_MAP(CCaptureDlg) v 4/-b4ET  
 ON_WM_SYSCOMMAND() (7FW9X;  
 ON_WM_PAINT() RI n9(r  
 ON_WM_QUERYDRAGICON() Ard]147  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Y4.Eq+$gh  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e$)300 o  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {No L  
//}}AFX_MSG_MAP 'T=~jA7SkT  
END_MESSAGE_MAP() o|pT;1a"  
eJCjJ)  
BOOL CCaptureDlg::OnInitDialog() ~X(UcZ2  
{ aolN<u3G  
 CDialog::OnInitDialog(); _6@hTen`  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 58xnB!h\}  
 ASSERT(IDM_ABOUTBOX < 0xF000);  u6u=2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); yL4 T  
 if (pSysMenu != NULL) K5t0L!6<+  
 { 'J)2g"T@  
  CString strAboutMenu; oEz%={f  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0JuD ^  
  if (!strAboutMenu.IsEmpty()) RkEN ,xWE  
  { U5HKRO  
   pSysMenu->AppendMenu(MF_SEPARATOR); -Ng'<7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); U:6W+p8  
  } h0vob_Fdl  
 } b,TiMf9},h  
 SetIcon(m_hIcon, TRUE); // Set big icon F|bYWYED;  
 SetIcon(m_hIcon, FALSE); // Set small icon 2aA`f7  
 m_Key.SetCurSel(0); Uh1NO&i.W  
 RegisterHotkey(); "[p@tc?5  
 CMenu* pMenu=GetSystemMenu(FALSE); P>Euq'ajX  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); v60^4K>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3-Dt[0%{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6 9y;`15  
 return TRUE; // return TRUE unless you set the focus to a control V! |qYM.  
} %#L]]-%  
gd/H``x|Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "<+ih0Ma  
{ G.'+-v=\]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Mp$@`8X`  
 { (m[bWdANnW  
  CAboutDlg dlgAbout; E`H$YS3o  
  dlgAbout.DoModal(); hJz):d>Im  
 } f ).1]~  
 else 5v)(8|.M  
 { ^I6^g  
  CDialog::OnSysCommand(nID, lParam); }U w&Ny  
 } $/1c= Y@  
} ;{[>&4  
R =Ws#'  
void CCaptureDlg::OnPaint() /%aiEhL  
{ # {fTgq  
 if (IsIconic()) 8.=\GV  
 { dUznxZB  
  CPaintDC dc(this); // device context for painting NCqo@vE  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j;_c+w!P  
  // Center icon in client rectangle CRve.e8J  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZR v"h/~  
  int cyIcon = GetSystemMetrics(SM_CYICON); e pCLM_yA  
  CRect rect; (R~]|?:wt  
  GetClientRect(&rect); 8n BL\{'B[  
  int x = (rect.Width() - cxIcon + 1) / 2; am_gH  
  int y = (rect.Height() - cyIcon + 1) / 2; |wEN`#.;b  
  // Draw the icon e^YHJ>@  
  dc.DrawIcon(x, y, m_hIcon); Hd7,ZHj3 ^  
 } (KZHX5T=  
 else ,h\sF#|  
 { WnwhSr2  
  CDialog::OnPaint(); >R{qESmP=  
 } @pI5lh  
} _{vkX<s  
%S` v!*2  
HCURSOR CCaptureDlg::OnQueryDragIcon() "TV(H+1,z  
{ GSoZx0  
 return (HCURSOR) m_hIcon; H+}"q$  
} {wF&+kH3  
6<,dRn  
void CCaptureDlg::OnCancel() n 26Y]7N  
{ -"Y{$/B  
 if(bTray) w:Jrmx  
  DeleteIcon(); 22<0DhJ  
  CDialog::OnCancel(); m+{K^kr[  
} &AuF]VT  
< _$%@4 L  
void CCaptureDlg::OnAbout() H_!4>G@  
{ Glq85S  
 CAboutDlg dlg; 6qe*@o  
 dlg.DoModal(); p_ Fy >j  
} P+t#4J  
/:<IIqO.  
void CCaptureDlg::OnBrowse() o]{uc,  
{ \ 6EKgC1  
 CString str; { 74mf'IW  
 BROWSEINFO bi; biozZ  
 char name[MAX_PATH]; Z=4{Vv*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); B .TB\j  
 bi.hwndOwner=GetSafeHwnd(); Gc.P,K/hr  
 bi.pszDisplayName=name; .t&R>9cZ^  
 bi.lpszTitle="Select folder"; n\I#CH0V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x 5dWBGH  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [ rNXQ` /  
 if(idl==NULL) } B396X  
  return; :[@ k<8<]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &2-L. Xb  
 str.ReleaseBuffer(); 4> ^K:/y  
 m_Path=str; wn>edn  
 if(str.GetAt(str.GetLength()-1)!='\\') !@u>A_  
  m_Path+="\\"; C^t(^9  
 UpdateData(FALSE); dX8hpQ  
} w(L>#?  
@ P@c.*}s  
void CCaptureDlg::SaveBmp() c/L>>t  
{ k~%<Ir1V]  
 CDC dc; VhT= l  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); xE}VTHFo'  
 CBitmap bm; x\?;=@AW  
 int Width=GetSystemMetrics(SM_CXSCREEN); c4e_6=Iv  
 int Height=GetSystemMetrics(SM_CYSCREEN); U%7i=Z{^Ks  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *BD=O@  
 CDC tdc; W$JebW<z(  
 tdc.CreateCompatibleDC(&dc); ?^' 7+8C*J  
 CBitmap*pOld=tdc.SelectObject(&bm); $d+DDm1o  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0s#vwK13  
 tdc.SelectObject(pOld); ?#0snlah|  
 BITMAP btm; )f+U~4G&  
 bm.GetBitmap(&btm); _a_xzv'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {^{p,9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $=sXAK9   
 BITMAPINFOHEADER bih; ;E~4)^  
 bih.biBitCount=btm.bmBitsPixel; 6*9}4`  
 bih.biClrImportant=0; -]C c  
 bih.biClrUsed=0; -B#yy]8  
 bih.biCompression=0; W$dn_9W  
 bih.biHeight=btm.bmHeight; d-bqL:/  
 bih.biPlanes=1; @RD+xYm  
 bih.biSize=sizeof(BITMAPINFOHEADER); Dz!fpE'L  
 bih.biSizeImage=size; y`e4;*1  
 bih.biWidth=btm.bmWidth; l=`L7| ^/d  
 bih.biXPelsPerMeter=0; ;vhyhP.oM  
 bih.biYPelsPerMeter=0; D0Z\Vvy  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *y`%]Hy<  
 static int filecount=0; p6EDQwlf  
 CString name; /9Q3iV$I]  
 name.Format("pict%04d.bmp",filecount++); nU+tM~C%a  
 name=m_Path+name; va/m~k|i  
 BITMAPFILEHEADER bfh; 0)YbI!  
 bfh.bfReserved1=bfh.bfReserved2=0; v8>v.}y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); (-7ZI"Ku  
 bfh.bfSize=54+size; fBBa4"OK=  
 bfh.bfOffBits=54; TAL/a*7\  
 CFile bf; 3[p_!eoW  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #Z=tJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )/4(e?%=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F}Mhs17!|  
  bf.WriteHuge(lpData,size); @e~]t}fH  
  bf.Close(); :/YO ni1h  
  nCount++; MFJE6ei  
 } f<i7@%  
 GlobalFreePtr(lpData); Auy".br'  
 if(nCount==1) k1z$e*u&r  
  m_Number.Format("%d picture captured.",nCount); 1`f_P$&Z_J  
 else ;y?);!g  
  m_Number.Format("%d pictures captured.",nCount); %k f>&b,Mi  
  UpdateData(FALSE); ~>G]_H]?  
} CozKyt/r7  
m(D]qYwh  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,zcQS-e2  
{ QrD o|GtE  
 if(pMsg -> message == WM_KEYDOWN) %/"Oxi^G  
 { )!9Ifk0KH  
  if(pMsg -> wParam == VK_ESCAPE) gLD`wfZR  
   return TRUE; @54*.q$  
  if(pMsg -> wParam == VK_RETURN) #$S}3 o  
   return TRUE; ske@uzAz  
 } I"L;L?\S  
 return CDialog::PreTranslateMessage(pMsg); ~%w~-O2  
} :@ uIxa$[  
9V1cdb~?"T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xIbMs4'iEx  
{ ClW'W#*(Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [um&X=1V8  
  SaveBmp(); = Je>`{J  
  return FALSE; (Ha@s^?.C  
} /z."l!u6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \L!uHAE2a  
 CMenu pop; 9>m%`DG*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qX:B4,|ck  
 CMenu*pMenu=pop.GetSubMenu(0); =?@Q -(bp  
 pMenu->SetDefaultItem(ID_EXITICON); |fsm8t<~8  
 CPoint pt; 8"'x)y  
 GetCursorPos(&pt); UgHf*m  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2F_ R/{D  
 if(id==ID_EXITICON) SDJH;c0   
  DeleteIcon(); BW[5o3 i  
 else if(id==ID_EXIT) N?r>%4  
  OnCancel(); 9 wa,k  
 return FALSE; >X}{BDMb.  
} Os),;W0w4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); GrEs1M1]*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) To"dG& h  
 AddIcon(); 4z4v\IpB  
 return res; {5:Zl<0  
} 0Vv9BL{  
kN9yO5 h7  
void CCaptureDlg::AddIcon() J}g~uW  
{ =iz,S:[  
 NOTIFYICONDATA data; B:oF;~d/,  
 data.cbSize=sizeof(NOTIFYICONDATA); `_AM` >_  
 CString tip; 'UwI*EW2S  
 tip.LoadString(IDS_ICONTIP); iv%w!3#  
 data.hIcon=GetIcon(0); tiQ;#p7%  
 data.hWnd=GetSafeHwnd(); mMw;0/n  
 strcpy(data.szTip,tip); QEJGnl676  
 data.uCallbackMessage=IDM_SHELL; 9Ld9N;rWm#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; a% ,fXp>  
 data.uID=98; GG-[`!>.pw  
 Shell_NotifyIcon(NIM_ADD,&data); 'w<BJTQIL  
 ShowWindow(SW_HIDE); )qM|3],  
 bTray=TRUE; $3 8gs{+  
} P;91~``b-  
(i`(>I.(/  
void CCaptureDlg::DeleteIcon() L/r{xS  
{ tB6k|cPC  
 NOTIFYICONDATA data; U{1z;lJ  
 data.cbSize=sizeof(NOTIFYICONDATA); KsdG(.I+ek  
 data.hWnd=GetSafeHwnd(); iyM^[/-R6  
 data.uID=98; |qUrEGjiSS  
 Shell_NotifyIcon(NIM_DELETE,&data); pG yRX_;  
 ShowWindow(SW_SHOW); ijZ>:B2:  
 SetForegroundWindow(); >9(i)e  
 ShowWindow(SW_SHOWNORMAL); 3 ]}'TA`v  
 bTray=FALSE; :EHQ .^  
} v[#)GB _5  
'Ji+c  
void CCaptureDlg::OnChange() X , ZeD  
{ it}-^3A M  
 RegisterHotkey(); `BT*,6a  
} -J$g(sikt  
!Yh}H<w0  
BOOL CCaptureDlg::RegisterHotkey() 'U)8rR  
{ m^tNqJs8  
 UpdateData(); f!g<3X{=  
 UCHAR mask=0; 31XU7A  
 UCHAR key=0; Pz473d  
 if(m_bControl) iHz[Zw^.s  
  mask|=4; DP>mNE  
 if(m_bAlt) h([0,:\  
  mask|=2; :C%47qv  
 if(m_bShift) 5u,sx664  
  mask|=1; rSyaZ6#  
  key=Key_Table[m_Key.GetCurSel()]; :kp0EiJ  
 if(bRegistered){ 5-'vB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |~NeB"l{  
  bRegistered=FALSE; yX9B97XyC  
 } <xF?~7  
 cMask=mask; M {xie  
 cKey=key; 6FjVmje  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); raQYn?[  
 return bRegistered; ^Kw(& v  
} C4_t_N  
I7Zq}Pxa  
  四、小结 6Bdyf(t  
^<9)"9)m_  
  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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