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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: `{yD\qDyX  
  k,OxGG  
  一、实现方法 \\Zsxya1  
U1yspHiZ  
  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: -hF!_);{  
oQ Vm)Bn'R  
#pragma data_seg("shareddata") y q2AZ@}"  
HHOOK hHook =NULL; //钩子句柄 we}5'bS>  
UINT nHookCount =0; //挂接的程序数目 CyVi{"aF3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pi;fu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4ke.p<dG  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a~VW?wq  
static int KeyCount =0; $Y$s*h_-/<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 nJgN2Z  
#pragma data_seg() j$u  
N>s3tGh  
  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。 cjLA7I.O  
\ z*<^ONq  
  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: 0jXDjk5'<  
1_xkGc-z<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4 q % Gc  
cKey,UCHAR cMask) u3 +]3!BQ  
{ , P1m#  
 BOOL bAdded=FALSE; J| 46i  
 for(int index=0;index<MAX_KEY;index++){ DDT]A<WUV  
  if(hCallWnd[index]==0){ lS2 `#l>  
   hCallWnd[index]=hWnd; } ?+0s=Z  
   HotKey[index]=cKey; _+~jZ]o N  
   HotKeyMask[index]=cMask; q|lP?-j  
   bAdded=TRUE; d n%'bt  
   KeyCount++; {)Zz4  
   break; g p9;I*!  
  } +5GC?cW  
 } djdSD  
 return bAdded; D+BflI~9mP  
} *|+$7j  
//删除热键 ;]BNc"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  )DW".c  
{ *xeJ4h  
 BOOL bRemoved=FALSE; 0!c/4^  
 for(int index=0;index<MAX_KEY;index++){ kmJ<AnK  
  if(hCallWnd[index]==hWnd){ H]dN'c-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K(NP%:  
    hCallWnd[index]=NULL; hR>`I0|p&  
    HotKey[index]=0; ZTGsZ}{5   
    HotKeyMask[index]=0; tQMz1$  
    bRemoved=TRUE; A,#z_2~  
    KeyCount--; vMXn#eR  
    break; p8CaD4bE  
   } 3=Xvl 58k  
  } I=E\=UTG,5  
 } ;$r!eFY;  
 return bRemoved; cnDBT3$~Z  
} 'F1<m^  
Hc0V4NHCaL  
x;7p75Wm  
  DLL中的钩子函数如下: <Lle1=qQ  
@a]`C $ 6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "+&@iL  
{ M7gqoJM'Q  
 BOOL bProcessed=FALSE; m}m|(;T  
 if(HC_ACTION==nCode) {X\FS   
 { |z)7XK  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 61b<6 r0o  
   switch(wParam) 'Te'wh=Y  
   {  |L)qH"Eo  
    case VK_MENU: kgX"I ?>d  
     MaskBits&=~ALTBIT; 0M}Ql5+h,  
     break; 5e'**tbKH  
    case VK_CONTROL: i,y{*xBT  
     MaskBits&=~CTRLBIT; :y!{=[>M(  
     break; *ul-D42!U  
    case VK_SHIFT: ^X*l&R_=R  
     MaskBits&=~SHIFTBIT; p!(]`N   
     break; K!G/iz9SB  
    default: //judge the key and send message Kku@!lv  
     break; xAf?E%_pi  
   } %(1y  
   for(int index=0;index<MAX_KEY;index++){ oFu( J  
    if(hCallWnd[index]==NULL) erV&N,cI  
     continue; $O9#4A;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M[Jy?b)  
    { i:^ 8zW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *pGbcBQ  
     bProcessed=TRUE; y(r(q  
    } `b5pa`\4  
   } a3_pF~Qx  
  } G7HvA46  
  else if((lParam&0xc000ffff)==1){ //有键按下 .!1E7\  
   switch(wParam) o PA m*  
   { s.!gsCQme  
    case VK_MENU: V#-8[G6Ra  
     MaskBits|=ALTBIT; 4L2TsuLw  
     break; a&`Lfw"  
    case VK_CONTROL: ]u >~:  
     MaskBits|=CTRLBIT; )}\J    
     break; n6GB2<y  
    case VK_SHIFT: z0tm3ovp  
     MaskBits|=SHIFTBIT; {,o 0N\(  
     break; Kx,<-]4  
    default: //judge the key and send message R M`iOV,Y  
     break; *i7|~q/u  
   } K&iU+  
   for(int index=0;index<MAX_KEY;index++){ rge/qUr/^  
    if(hCallWnd[index]==NULL) :LR>U;2  
     continue; SDW!9jm>R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @(e/Y/  
    { TP)}1 @  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lLL)S  
     bProcessed=TRUE; yKOC1( ~  
    } flU?6\_UC  
   } wb-_CQ  
  } Mg {=(No  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1&YkRCn0  
   for(int index=0;index<MAX_KEY;index++){ pU@ &-  
    if(hCallWnd[index]==NULL) @w[HXb  
     continue; bjs{_?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) D +9l$**a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *f+DV[DF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 HS 1zA  
   } +@yTcz  
  } ~0gHh  
 } e:WKb9nT  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @avG*Mr^  
} n]WVT@  
X~g~U|B@  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: V0F&a~Q  
p+1kU1F0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Sa$-Yf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Eg#WR&Uq"  
ksli-Px  
  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: e:RgCDWL  
XRWy#Pj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IM~2=+  
{ eq$.np  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) yK:b $S  
 { B["C~aF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +T]D\];D  
  SaveBmp(); X?OH//co  
  return FALSE; [#C(^J*@c  
 } .L}k-8  
 …… //其它处理及默认处理 5'[b:YC  
} #qdfr3  
/gq VXDY+`  
c\(CbC  
  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。 45tQ$jr`1  
j.7BoV  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 O3["5  
4oRDvn7f&  
  二、编程步骤 UB|}+WA3  
nK9?|@S*'  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; o",J{  
#\$AB_[ot>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y^hCO:`l3  
aqN6.t  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; c R6:AGr  
._US8  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +I r  
C7 T}:V](q  
  5、 添加代码,编译运行程序。 zqa7!ky  
FWDAG$K@0  
三、程序代码 v<t r1cUT  
jkfc=O6^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL RD0=\!w*5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4b :q84  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <e@+w6Kp'7  
#if _MSC_VER > 1000 QL`Hb p  
#pragma once MPD<MaW$  
#endif // _MSC_VER > 1000 xv>]e <":  
#ifndef __AFXWIN_H__ Al pk5o5B  
#error include 'stdafx.h' before including this file for PCH =' <789wT  
#endif QNm8`1  
#include "resource.h" // main symbols Ud'/ 9:P  
class CHookApp : public CWinApp `ehcj G1nY  
{ \d}>@@U&  
 public: .h[yw$z6  
  CHookApp(); Vo8gLX]a  
  // Overrides NNP ut$.  
  // ClassWizard generated virtual function overrides MC;2.e`  
  //{{AFX_VIRTUAL(CHookApp) h@yn0CU3.  
 public: k?;B1D8-n  
  virtual BOOL InitInstance(); j NkobJ1  
  virtual int ExitInstance(); YzVhNJWpw  
  //}}AFX_VIRTUAL ![j?/376  
  //{{AFX_MSG(CHookApp) ;30SnR/  
  // NOTE - the ClassWizard will add and remove member functions here. nb_$g@ 03  
  // DO NOT EDIT what you see in these blocks of generated code ! ` D={l29H  
  //}}AFX_MSG b,uu dtlH  
  DECLARE_MESSAGE_MAP() i-gN< 8\v  
}; G#nZ%qQ:I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~X!Z+Vg  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _mc-CZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~Y/o9x0  
BOOL InitHotkey(); 0*yD   
BOOL UnInit(); b .|k j  
#endif 6w)a.^yx7  
xSy`VuSl  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \x;`8H  
#include "stdafx.h" Bw25+l Px  
#include "hook.h" 25{-GaB  
#include <windowsx.h>  aK33bn'j  
#ifdef _DEBUG ^c|_%/  
#define new DEBUG_NEW &r)[6a$fW  
#undef THIS_FILE Yh2[ nF_  
static char THIS_FILE[] = __FILE__; G[$g-NU+  
#endif !N'HL-oT  
#define MAX_KEY 100 |Q?^Ba  
#define CTRLBIT 0x04 xTg=oq  
#define ALTBIT 0x02 N`et]'_A}  
#define SHIFTBIT 0x01 5L\&"['  
#pragma data_seg("shareddata") "kd)dy95H  
HHOOK hHook =NULL; =bJ7!&  
UINT nHookCount =0; zy(NJ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey TP{2q51yM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B"?ivxM:U  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +o-jMvK9  
static int KeyCount =0; o&ETs)n|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift TQ5*z,CkS  
#pragma data_seg() ,8 G6q_ud  
HINSTANCE hins; a]nK!;>$  
void VerifyWindow(); 1Y'NG<d _  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h5<eU;Rw+  
//{{AFX_MSG_MAP(CHookApp) G4](!f!Kv  
// NOTE - the ClassWizard will add and remove mapping macros here. h0a|R4J  
// DO NOT EDIT what you see in these blocks of generated code! @|([b r|O  
//}}AFX_MSG_MAP #pcgfVl  
END_MESSAGE_MAP() W`v$-o-  
)k.}>0K |  
CHookApp::CHookApp() zd|n!3;  
{ 5y8VA4L/o  
 // TODO: add construction code here, %%FzBbWAO  
 // Place all significant initialization in InitInstance QTC!vKM  
} a'Yi^;2+\  
%z~=Jz^  
CHookApp theApp; ,0a\Ka {^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) * }) W>  
{ GRh430V [  
 BOOL bProcessed=FALSE; 50""n7I<%  
 if(HC_ACTION==nCode) H)+QkQb}  
 { z3I |jy1  
  if((lParam&0xc0000000)==0xc0000000){// Key up .tcdqL-'  
   switch(wParam) T.}Y&,n$$5  
   { @ Fkhida  
    case VK_MENU: s@IgaF {  
     MaskBits&=~ALTBIT; }`.d4mm  
     break; 2F :8=_sA  
    case VK_CONTROL: gCq'#G\Z  
     MaskBits&=~CTRLBIT; L3=5tuQ[5  
     break; lHAWZyO  
    case VK_SHIFT: U0Uy C  
     MaskBits&=~SHIFTBIT; 8W Etm}  
     break; 10_#Z~aU  
    default: //judge the key and send message 1xI  
     break; $C{,`{=  
   } pO92cGJ8  
   for(int index=0;index<MAX_KEY;index++){ R,ZG?/#uM9  
    if(hCallWnd[index]==NULL) nF B]#LLv  
     continue; !_P&SmK3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;SIWWuk  
    { u4j"U6"]M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Y>6N2&Q  
     bProcessed=TRUE; -Xx4:S  
    } pX+4B=*  
   } V503  
  } Y (p Ud3y  
  else if((lParam&0xc000ffff)==1){ //Key down TV=K3F5)M  
   switch(wParam) McpQ7\*h  
   { dci<Rz`h  
    case VK_MENU: 5th?m>  
     MaskBits|=ALTBIT; ,x$^^  
     break; 7=%Oev&0g-  
    case VK_CONTROL: .$@+ / @4  
     MaskBits|=CTRLBIT; dIfy!B"  
     break; )k;;O7C k  
    case VK_SHIFT: m*jTvn  
     MaskBits|=SHIFTBIT; HuJc*op-6  
     break; c?N,Cd~q  
    default: //judge the key and send message XO+rg&Pu  
     break; /,`OF/%  
   } "([/G?QAG  
   for(int index=0;index<MAX_KEY;index++) h+ud[atk.  
   { Z?xRSi2~7  
    if(hCallWnd[index]==NULL) IVY)pS"pR"  
     continue; xHMFYt+0$G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) | kP utB  
    { u"4 B5D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PD&gC88  
     bProcessed=TRUE; hHHQmK<r  
    } -n8d#Qm)  
   } 9:P]{}  
  } W.NZ%~|+e/  
  if(!bProcessed){ <{GVA0nr  
   for(int index=0;index<MAX_KEY;index++){ c_8<N7 C  
    if(hCallWnd[index]==NULL) A; wT`c  
     continue; UWidT+'Sa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sQe GT)/|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m7DKC,  
   } J\P6  
  } G;$; $gM  
 } 'qvj[lpGr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?w+ V:D  
} _OC@J*4.  
hGkJ$QT  
BOOL InitHotkey() 7B)1U_L0H  
{ 5VJe6i9;  
 if(hHook!=NULL){ }opw_h+/F  
  nHookCount++; Ulx]4;uzf  
  return TRUE; ^ H&U_  
 } > K?OsvX  
 else [}]yJ+)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); GX0zirz  
  if(hHook!=NULL) n}j6gN!O  
   nHookCount++; y pyKRsx  
  return (hHook!=NULL); uZZRFioX|  
} Px&_6}YWy  
BOOL UnInit() 1I{8 |  
{ Zskj?+1  
 if(nHookCount>1){ -5 8q 6yA  
  nHookCount--; -rn6ZSD)  
  return TRUE; N -]/MB 8  
 } !~yBz H;K  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bi^?SH\  
 if(unhooked==TRUE){ n{i,`oQ"  
  nHookCount=0; *67K_<bp]  
  hHook=NULL; fjVy;qJ32S  
 } g (WP  
 return unhooked; //_H _ue$  
} S YDE`-  
r:;.?f@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H=Ilum06  
{ KVJ, a  
 BOOL bAdded=FALSE; OU"%,&J  
 for(int index=0;index<MAX_KEY;index++){ fj)) Hnt(|  
  if(hCallWnd[index]==0){ 8M@'A5]  
   hCallWnd[index]=hWnd; [d8Q AO1;)  
   HotKey[index]=cKey; RGE(#   
   HotKeyMask[index]=cMask; {X&lgj  
   bAdded=TRUE; p*&0d@'r  
   KeyCount++; ?UZt30|1  
   break; ?)y^ [9  
  } dw3Hk$"h  
 } z8'1R6nq  
 return bAdded; M{Z ;7n'  
} `}$o<CJ  
%KXiB6<4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {VL@U$'oI  
{ pX ^^0  
 BOOL bRemoved=FALSE; o[T+/Ej&  
 for(int index=0;index<MAX_KEY;index++){ !6T"J!F#  
  if(hCallWnd[index]==hWnd){ ~?AEtl#&"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PmRvjSIG  
    hCallWnd[index]=NULL; J+J,W5t^  
    HotKey[index]=0; #uw&u6*\q  
    HotKeyMask[index]=0; *L$2M?xkY  
    bRemoved=TRUE; Zn'tNt/  
    KeyCount--; E5d$n*A  
    break; Z0jgUq`r  
   } /}(d'@8p  
  } +t+<?M B  
 } :q]9F4im  
 return bRemoved; ^k;]"NR  
} fq]PKLW'  
RhH 1nf2UR  
void VerifyWindow() |zYOCDFf  
{ o)/Pr7Qn  
 for(int i=0;i<MAX_KEY;i++){ 4=xi)qF/@  
  if(hCallWnd!=NULL){ !qj[$x-ns  
   if(!IsWindow(hCallWnd)){ <4"-tYa  
    hCallWnd=NULL; La;G S  
    HotKey=0; Aw |;C  
    HotKeyMask=0; }OL"38P  
    KeyCount--; l9Ir@.m  
   } @#)` -]g  
  } "y,YC M`  
 } kg[%Q]]  
} /Hyz]46  
^Tm`motzh  
BOOL CHookApp::InitInstance() Ki\.w~Qs  
{ *h!fqT%9  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _U<fS  
 hins=AfxGetInstanceHandle(); /|1p7{km  
 InitHotkey(); /Vn>(;lo  
 return CWinApp::InitInstance(); !Qe ;oMqy}  
} aa`(2%(:  
?Gki0^~J  
int CHookApp::ExitInstance() ?;XEb\Kf  
{ t'rN7.d  
 VerifyWindow(); kI^* '=:  
 UnInit(); _\}'5nmw\  
 return CWinApp::ExitInstance(); d,V#5l-6  
} ,Of^xER`  
^dHQ<L3.*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N1c=cZDV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) i2~uhGJ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f"QiVJq  
#if _MSC_VER > 1000 (+> 2&@@<  
#pragma once [1VA`:?W  
#endif // _MSC_VER > 1000 QPJ \Iu@D$  
d(T4Kd$r  
class CCaptureDlg : public CDialog {r,U ik-nL  
{ wA=r ]BT  
 // Construction ,#A(I#wL~  
 public: $ J`O-"M  
  BOOL bTray; h:YD $XE  
  BOOL bRegistered; \k.`xG?  
  BOOL RegisterHotkey(); ?Z7`TnG$uf  
  UCHAR cKey; GM%+yS}(P  
  UCHAR cMask; 3 !"N;Q"  
  void DeleteIcon(); 9-KhJq%  
  void AddIcon(); C82_ )@96  
  UINT nCount; 0 &zp  
  void SaveBmp(); EKwQ$?I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \G" S7  
  // Dialog Data M&Ka ^h;N  
  //{{AFX_DATA(CCaptureDlg) LVj 1NP  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2$JGhgDI  
  CComboBox m_Key; eqo0{e  
  BOOL m_bControl; !eLj + 0  
  BOOL m_bAlt; ti\ ${C3  
  BOOL m_bShift; 1 em,/> "  
  CString m_Path; 9y7N}T6  
  CString m_Number; J D\tt-  
  //}}AFX_DATA tE7jTe  
  // ClassWizard generated virtual function overrides m&UP@hUV-  
  //{{AFX_VIRTUAL(CCaptureDlg) zM9#1^X  
 public: =)[m[@,c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); v= 55{  
 protected: HN5m%R&`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I"07x'Ahq3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^\\3bW9}H  
  //}}AFX_VIRTUAL nw+~:c  
  // Implementation Xn6#q3;^|  
 protected: A6N6e\*  
  HICON m_hIcon; XE}gl&\  
  // Generated message map functions 25Dl4<-Z  
  //{{AFX_MSG(CCaptureDlg) ~M C|  
  virtual BOOL OnInitDialog(); k ut=( ;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZZw`8 E  
  afx_msg void OnPaint(); :xh{SsW@  
  afx_msg HCURSOR OnQueryDragIcon(); {Su?*M2y  
  virtual void OnCancel(); i"2OsGT  
  afx_msg void OnAbout(); "TV'}HH  
  afx_msg void OnBrowse(); 4CNrIF@  
  afx_msg void OnChange(); $*yYmF  
 //}}AFX_MSG *]6g-E?:@  
 DECLARE_MESSAGE_MAP() o.+;]i}D  
}; |VBt:dd<  
#endif Yh":>~k?SY  
{ZJO5*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m|a9T#B(  
#include "stdafx.h" :RaQ =C  
#include "Capture.h" >rSjP1-F  
#include "CaptureDlg.h" (o^tmH*  
#include <windowsx.h> "HMEoZ  
#pragma comment(lib,"hook.lib") {keZ_2  
#ifdef _DEBUG "[bkdL<  
#define new DEBUG_NEW L$ZjMJ  
#undef THIS_FILE d>NGCe  
static char THIS_FILE[] = __FILE__; 7FB?t<x  
#endif B VBn.ut  
#define IDM_SHELL WM_USER+1 8:ubtB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Kb.qv)6i*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D!<F^mtl  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; gD,&TW  
class CAboutDlg : public CDialog ?YhDjQs  
{ L.Y3/H_  
 public: 8Sbz)X  
  CAboutDlg(); ,UNb#=it  
  // Dialog Data ZoW1Cc&p  
  //{{AFX_DATA(CAboutDlg) z+"tAVB[i  
  enum { IDD = IDD_ABOUTBOX }; uZqL'l+/y  
  //}}AFX_DATA B=_w9iVN  
  // ClassWizard generated virtual function overrides t*{L[c9.Uq  
  //{{AFX_VIRTUAL(CAboutDlg) ,+=9Rp`md  
 protected: }V?m =y [  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %b6$N_M{H1  
  //}}AFX_VIRTUAL 6x+ujUBkK  
  // Implementation i_Kwxn$  
 protected: i2F7O"f.  
  //{{AFX_MSG(CAboutDlg) d t/AAk6  
  //}}AFX_MSG 0YH5B5b  
  DECLARE_MESSAGE_MAP() =7Ln&tZ  
}; }0'=}BE  
xQoZ[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) u?osX;'w  
{ L\:|95Yq  
 //{{AFX_DATA_INIT(CAboutDlg) H4$qM_N  
 //}}AFX_DATA_INIT 'o AmA=  
} GABZsdFZ!  
xL}i9ozZ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5cSiV7#Y:  
{ b?H"/Mu.  
 CDialog::DoDataExchange(pDX); |;ztK[(  
 //{{AFX_DATA_MAP(CAboutDlg) c4JV~VS+  
 //}}AFX_DATA_MAP wi(Y=?=  
} ]vrZGX a+  
ER0 Yl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =|3BkmO  
 //{{AFX_MSG_MAP(CAboutDlg) "J VIkC  
 // No message handlers inP2y?j  
 //}}AFX_MSG_MAP c[dSO(=  
END_MESSAGE_MAP() gf|uZ9{  
u'YXI="(  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |z-f 8$  
: CDialog(CCaptureDlg::IDD, pParent) Y:^hd809  
{ Hon2;-:]{]  
 //{{AFX_DATA_INIT(CCaptureDlg) |'^s3i&w  
  m_bControl = FALSE; %iyc1]w{  
  m_bAlt = FALSE; 1\}vU  
  m_bShift = FALSE; F O!Td  
  m_Path = _T("c:\\"); A*JOp8\)  
  m_Number = _T("0 picture captured."); /{T&l*'  
  nCount=0; iaGA9l<b  
  bRegistered=FALSE; j=WxtMS  
  bTray=FALSE; coP->&(@U#  
 //}}AFX_DATA_INIT +m=b "g  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %(CC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f56yI]*N=<  
} $?= $F  
^q7V%{54  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %hB-$nE  
{ l.Q  
 CDialog::DoDataExchange(pDX); 3efOgP=L  
 //{{AFX_DATA_MAP(CCaptureDlg) Cxf K(F  
  DDX_Control(pDX, IDC_KEY, m_Key); ~7m`p3W@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ? <?Ogq"<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); XlppA3JON|  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c_/BS n  
  DDX_Text(pDX, IDC_PATH, m_Path); 5Rbl.5. A  
  DDX_Text(pDX, IDC_NUMBER, m_Number); FP@_V-  
 //}}AFX_DATA_MAP |t,sK aL  
} $BqiC!~  
(tK_(gO  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Sd+5Uf `  
//{{AFX_MSG_MAP(CCaptureDlg) qv!(In>u  
 ON_WM_SYSCOMMAND() K #3^GB3P  
 ON_WM_PAINT() :1'  
 ON_WM_QUERYDRAGICON() 7Cz~nin>7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 26V6Y2X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T(!1\TB  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *zrT;j G  
//}}AFX_MSG_MAP a>4/2#J  
END_MESSAGE_MAP() Dri6\/0  
u[a-9^&g  
BOOL CCaptureDlg::OnInitDialog() I?T !  
{ {^]qaQ[5N  
 CDialog::OnInitDialog(); UZdnsG7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hf`y_H+\7  
 ASSERT(IDM_ABOUTBOX < 0xF000); x39tnf/F  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N,`@Q7  
 if (pSysMenu != NULL) h ldZA  
 { c`E>7Hjr-  
  CString strAboutMenu; #MC#K{Xd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &;Ncc,jb  
  if (!strAboutMenu.IsEmpty()) O,$*`RZpx  
  { z#{Y>.b  
   pSysMenu->AppendMenu(MF_SEPARATOR); FZ*"^=)`G  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); " ityx?  
  } CD1Ma8I8  
 } R|?n  
 SetIcon(m_hIcon, TRUE); // Set big icon B`SX3,3  
 SetIcon(m_hIcon, FALSE); // Set small icon snbXAx1L  
 m_Key.SetCurSel(0); SSe;&Jk2d  
 RegisterHotkey(); +y| B"}x  
 CMenu* pMenu=GetSystemMenu(FALSE); Et6j6gmif  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ey@^gHku\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yg\QtWW M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); D+T/ Z)  
 return TRUE; // return TRUE unless you set the focus to a control =?]`Xo,v~  
} ,Yag! i>;  
RDps{),E;d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FSuC)Xg  
{ Fe8X@63  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3M#x)cW  
 { "&_+!TBg,  
  CAboutDlg dlgAbout; HT7,B(.}  
  dlgAbout.DoModal(); 1wgL^Qz@  
 } v.ZUYa|  
 else It*U"4lgi  
 { L15)+^4n  
  CDialog::OnSysCommand(nID, lParam); s}zR@ !`  
 } :3F[!y3b  
} ^EIuGz1@0  
0fc;H}B*  
void CCaptureDlg::OnPaint() xI,3(A.  
{ @!;A^<{ka  
 if (IsIconic()) PqspoH 0OI  
 { rtPo)#t  
  CPaintDC dc(this); // device context for painting 73qE!(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %[XP}L$  
  // Center icon in client rectangle =CzGI|pb  
  int cxIcon = GetSystemMetrics(SM_CXICON); :k9T`Aa]  
  int cyIcon = GetSystemMetrics(SM_CYICON); <?41-p-;  
  CRect rect; +G;<D@gSa0  
  GetClientRect(&rect); k$=L&id  
  int x = (rect.Width() - cxIcon + 1) / 2; le:}M M  
  int y = (rect.Height() - cyIcon + 1) / 2; R3g)LnN  
  // Draw the icon >VhZv75  
  dc.DrawIcon(x, y, m_hIcon); rB J`=oz  
 } Xl=RaV^X"  
 else $YJ 1P  
 { @ 5d^ C  
  CDialog::OnPaint(); 6{I7=.V  
 } &D<6Go/)_*  
} >p&"X 2 @  
&5}YTKe}|  
HCURSOR CCaptureDlg::OnQueryDragIcon() JCH9~n.  
{ UV(`.  
 return (HCURSOR) m_hIcon; x@ X2r  
} h<L_ =)lH  
G 1{m"1M  
void CCaptureDlg::OnCancel() wn"\ @QvG  
{ 4EYD5  
 if(bTray) fAh|43Y*a  
  DeleteIcon(); olv&K(-ccI  
  CDialog::OnCancel(); p$"~v A .  
} !S~)U{SSK  
D)MFii1J~  
void CCaptureDlg::OnAbout() (jKqwVs.:  
{ Az8b_:=  
 CAboutDlg dlg; cO:lpsKYQ  
 dlg.DoModal(); @Ez>?#z  
} ESviWCh0Fl  
JbEEI(Q>g  
void CCaptureDlg::OnBrowse() 9q]f]S.L  
{ `*[Kmb\  
 CString str; oW OR7)?r  
 BROWSEINFO bi; !I|_vJ@<  
 char name[MAX_PATH]; ; FI'nL  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); HRTNIx  
 bi.hwndOwner=GetSafeHwnd(); Qfp4}a=  
 bi.pszDisplayName=name; B<~AUf*y  
 bi.lpszTitle="Select folder"; wmpQF<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; qKSR5 #  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); iK2f]h  
 if(idl==NULL) WiH8j$;xu  
  return; !"FEp  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H/t0#  
 str.ReleaseBuffer(); \[!{tbK`2  
 m_Path=str; >07i"a  
 if(str.GetAt(str.GetLength()-1)!='\\') O0y0'P-rJq  
  m_Path+="\\"; 75>%!mhM  
 UpdateData(FALSE); Y"ta`+ VJ  
} `pv  
iwIn3R,  
void CCaptureDlg::SaveBmp() 3 85qQppz  
{ Cw^iA U  
 CDC dc; foPM5+.G  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); UV|{za$&/  
 CBitmap bm; W +Piqf*  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6r^ZMW  
 int Height=GetSystemMetrics(SM_CYSCREEN); o>*`wv  
 bm.CreateCompatibleBitmap(&dc,Width,Height); FoE}j   
 CDC tdc; [-`s`g-  
 tdc.CreateCompatibleDC(&dc); (4z_2a(Dl,  
 CBitmap*pOld=tdc.SelectObject(&bm); =f@71D1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2cu2S"r  
 tdc.SelectObject(pOld); wo62R&ac  
 BITMAP btm; A99;bf}"  
 bm.GetBitmap(&btm); Zk7!CJVM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;=0-B&+v  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P:J|![   
 BITMAPINFOHEADER bih; %-YWn`yEm  
 bih.biBitCount=btm.bmBitsPixel; G;u 6p  
 bih.biClrImportant=0; 3]iw3M  
 bih.biClrUsed=0; f7zB_hVDmE  
 bih.biCompression=0; o^5UHFxTCB  
 bih.biHeight=btm.bmHeight; g[y&GCKY!=  
 bih.biPlanes=1; Ce//; Op  
 bih.biSize=sizeof(BITMAPINFOHEADER); @@a#DjE%/  
 bih.biSizeImage=size; Bd*Ok]  
 bih.biWidth=btm.bmWidth; ^69(V LK  
 bih.biXPelsPerMeter=0; G(A7=8vW  
 bih.biYPelsPerMeter=0; Y 8}y0]V  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9k4z__Ke  
 static int filecount=0; <bn|ni|c"  
 CString name; EAh|$~X  
 name.Format("pict%04d.bmp",filecount++); b L.Xb y<Y  
 name=m_Path+name; '?90e4x3/  
 BITMAPFILEHEADER bfh; y)fz\wk  
 bfh.bfReserved1=bfh.bfReserved2=0; uR=*q a  
 bfh.bfType=((WORD)('M'<< 8)|'B'); N f?\O@  
 bfh.bfSize=54+size; s!W{ru  
 bfh.bfOffBits=54; {y|.y~vW  
 CFile bf; o7gZc/?n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .$f0!` t  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); , iEGf-!k  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8~!h8bkC  
  bf.WriteHuge(lpData,size); f&F9ImZ  
  bf.Close(); >y}> 5kv  
  nCount++; 7h. [eMLPB  
 } bTx4}>=5l  
 GlobalFreePtr(lpData); A\"4[PXpQ  
 if(nCount==1) | Eu#mN  
  m_Number.Format("%d picture captured.",nCount); Q(WfWifu-|  
 else 'mv|6Y  
  m_Number.Format("%d pictures captured.",nCount); _x-2tnIxXv  
  UpdateData(FALSE); $/u.F;  
} 6QHUBm2  
M"-53|#:w\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) eMOp}.zt|  
{ ?t;,Nk`jx  
 if(pMsg -> message == WM_KEYDOWN) i*xVD`x~  
 { dF|n)+C~R  
  if(pMsg -> wParam == VK_ESCAPE) #BEXj<m+J  
   return TRUE; Vs>e"czfm/  
  if(pMsg -> wParam == VK_RETURN) EE9eG31|r  
   return TRUE; yp hd'Pu"  
 } q@mZ0D-  
 return CDialog::PreTranslateMessage(pMsg); E)'T;%  
} u#ocx[  
'*U_!RmQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (e 2.Ru  
{ \*fXPJ4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ OK@yMGz1I  
  SaveBmp(); %Zeb#//Jz  
  return FALSE; <0/)v J- 9  
} 8M4GforP  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dphWxB  
 CMenu pop; s ldcI@Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f'j<v  
 CMenu*pMenu=pop.GetSubMenu(0); UOe@R|79q  
 pMenu->SetDefaultItem(ID_EXITICON); M(} T\R  
 CPoint pt; - Lsl  
 GetCursorPos(&pt); =m;cy0))  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HT_nxe`E  
 if(id==ID_EXITICON) r"7 !J[u  
  DeleteIcon(); .L)j ql%  
 else if(id==ID_EXIT) x` 4|^ u  
  OnCancel(); 4{$ L]toP  
 return FALSE; }y|_v^  
} 1LmbXH]%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h?QGJ^#8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) gE23C*!'&:  
 AddIcon(); +D h?MQt?  
 return res; =4/K#cQ  
} Z4k'c+  
9:!V":8q  
void CCaptureDlg::AddIcon() >(gbUW  
{ %zjyZ{=  
 NOTIFYICONDATA data; t4zKI~cO  
 data.cbSize=sizeof(NOTIFYICONDATA); H/0b3I^  
 CString tip; V4*/t#L/  
 tip.LoadString(IDS_ICONTIP); bM,%+9oz;  
 data.hIcon=GetIcon(0); _k)EqPYu@  
 data.hWnd=GetSafeHwnd(); tac_MtW?  
 strcpy(data.szTip,tip); `:gXQmt  
 data.uCallbackMessage=IDM_SHELL; m7cG ]a~a  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; fo;^Jg.  
 data.uID=98; q' t"  
 Shell_NotifyIcon(NIM_ADD,&data); @Bsvk9}  
 ShowWindow(SW_HIDE); 9 b&HqkXX  
 bTray=TRUE; PmUq~YZ7  
} VkC1\L6  
gue~aqtJ  
void CCaptureDlg::DeleteIcon() A2nL=9~   
{ FdxV#.BE  
 NOTIFYICONDATA data; bL%-9BG  
 data.cbSize=sizeof(NOTIFYICONDATA); "6WE6zq   
 data.hWnd=GetSafeHwnd(); &7w*=f8I  
 data.uID=98; r#mH[|@W~  
 Shell_NotifyIcon(NIM_DELETE,&data); G'iE`4`2  
 ShowWindow(SW_SHOW); #!j wn^yq  
 SetForegroundWindow(); pQCW6X  
 ShowWindow(SW_SHOWNORMAL); _o6Zj1p  
 bTray=FALSE; T\TKgO=)  
} +qa^K%K  
!$0ozDmD  
void CCaptureDlg::OnChange() X$< CIZ  
{ 70A* !v  
 RegisterHotkey(); /6'5uP   
} Ye\ &_w"  
[58qC:  
BOOL CCaptureDlg::RegisterHotkey() qD(dAU  
{ KhNE_. Z  
 UpdateData(); {G-y7y+E  
 UCHAR mask=0; Z"9D1Uk  
 UCHAR key=0; Oz5Ze/HBN  
 if(m_bControl) YZc{\~d  
  mask|=4; 1{CVd m<9  
 if(m_bAlt) $btk48a7  
  mask|=2; ^Zq3K  
 if(m_bShift) LHusy;<E[  
  mask|=1; $mst\]&;  
  key=Key_Table[m_Key.GetCurSel()]; Wl{}>F`W[  
 if(bRegistered){ !F)BTB7{<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); : UDh{GQ*  
  bRegistered=FALSE; j'LO '&sQ(  
 } @=6$ImU  
 cMask=mask; NvJ}|w,Z  
 cKey=key; ej]>*n  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'Fa~l'G7X  
 return bRegistered; Nj}-"R\u  
} hx!hI1   
iRI7x)^0"z  
  四、小结 s,8g^aF4  
SuJ4)f;'0  
  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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