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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: %z_PEqRj  
  -0{"QhdE%  
  一、实现方法 j(;o   
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ^j1WF[GiSO  
lR9~LNK?  
#pragma data_seg("shareddata") abVz/R/o  
HHOOK hHook =NULL; //钩子句柄 Y`x54_32  
UINT nHookCount =0; //挂接的程序数目 f[b x|6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 jo-qP4w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 c-2##Pf_8O  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey K`25G_Y3@  
static int KeyCount =0; ftqi>^i  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2bB&/Uumsd  
#pragma data_seg() z}" Xt=G?  
&mM[q 'V  
  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。 k3 65.nc  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: $ +`   
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &4%j   
cKey,UCHAR cMask) )i;o\UU  
{ #Zm%U_$<  
 BOOL bAdded=FALSE; \*5_gPj!d  
 for(int index=0;index<MAX_KEY;index++){ T =l4Vb{>  
  if(hCallWnd[index]==0){ j>5D4}*]f  
   hCallWnd[index]=hWnd; L b'HM-d  
   HotKey[index]=cKey; zdwr5k  
   HotKeyMask[index]=cMask; )T=cd   
   bAdded=TRUE; M] +FTz  
   KeyCount++; Ier0F7]I  
   break; DKjkO5R\  
  } 0V5 RZ`.  
 } 2xchjU-  
 return bAdded; >l\?K8jL9  
} >lo,0oG  
//删除热键 K#B)@W?9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6NO_S  
{ -N')LY  
 BOOL bRemoved=FALSE; m#E%, rT  
 for(int index=0;index<MAX_KEY;index++){ _pX y}D  
  if(hCallWnd[index]==hWnd){ 8( ^;h2O!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #'qEm=%  
    hCallWnd[index]=NULL; .@Z-<P"  
    HotKey[index]=0; PKT/U^2X]  
    HotKeyMask[index]=0; BwN65_5p  
    bRemoved=TRUE; 6wzTX8  
    KeyCount--; !,mv 7Yj  
    break; I e#LZti  
   } [jD.l;jF  
  } ?mK`Wleh?  
 } 7Ca+Pe}/n,  
 return bRemoved; ,= ;d<O8  
} o%+8.Tx6wT  
7/ "g} F}Q  
!N4?>[E  
  DLL中的钩子函数如下: D&0@k'  
Y7{9C*>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I/ pv0  
{ K<HF!YU#I2  
 BOOL bProcessed=FALSE; S C8r.  
 if(HC_ACTION==nCode) 7b,5*]oZ  
 { : QK )Ym  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t7rz]EN  
   switch(wParam) }c>[m,lz  
   {  D\~*| J  
    case VK_MENU: /( /)nYAjk  
     MaskBits&=~ALTBIT; -q9`Btz  
     break; `ySmzp  
    case VK_CONTROL: C F2*W).+  
     MaskBits&=~CTRLBIT; nVqFCBB  
     break; k_rtsN  
    case VK_SHIFT: x0ZEVa0`4  
     MaskBits&=~SHIFTBIT; p{knQ],   
     break; E\5cb[Y  
    default: //judge the key and send message ':kj\$U  
     break; A$K>:Tt>  
   } (fc /"B-  
   for(int index=0;index<MAX_KEY;index++){ r-#23iT.~  
    if(hCallWnd[index]==NULL) f)xHSF"  
     continue; gDP\u<2!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O]OZt,k(  
    { tBNkVh(c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %Lec\(-4L  
     bProcessed=TRUE; $a|DR  
    } \;w+_<zE5{  
   } #!wL0 p  
  } o|\0IG(\  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?QGAiu0  
   switch(wParam) \de82 4  
   { JzA`*X[  
    case VK_MENU: IfHB+H   
     MaskBits|=ALTBIT; /n= %#{  
     break; iyw "|+  
    case VK_CONTROL: 4%Q8>mEvT  
     MaskBits|=CTRLBIT; {/]Ks8`Dm  
     break; f n9[Li  
    case VK_SHIFT: q' };.tv  
     MaskBits|=SHIFTBIT; hcEU kD  
     break; P 0xInW F  
    default: //judge the key and send message \`N%77A  
     break; VXforI  
   } 7xAzd# c?=  
   for(int index=0;index<MAX_KEY;index++){ zi~_[l-  
    if(hCallWnd[index]==NULL) "Jw6.q+  
     continue; VmLV:"P}^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A&#P=m j  
    { %;UEyj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2.=3:q!H<%  
     bProcessed=TRUE; rA9BY :N@  
    } eWvL(2`Tx  
   } 30 Vv Zb  
  }  k~#F@_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >W,1s  
   for(int index=0;index<MAX_KEY;index++){ h>,yqiY4p  
    if(hCallWnd[index]==NULL) "j5b$T0P>  
     continue; A~ugx~S0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .YquOCc(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \>NjeMuWU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 j%R}  
   } )--v> *,V  
  } L^:+8g  
 } 8fzmCRFH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >Z k$q~'+  
} >#z*gCO5,  
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  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: rf"%D<bb  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f $MVgX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <>,V> k|  
eiB5 8b3  
  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: mA:NAV $!s  
`X8AM=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^\kv> WBE  
{ wrq0fHwM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /g3U,?qP  
 { lgTavs  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 oXG,8NOdC  
  SaveBmp(); %of#VSk  
  return FALSE; -R 4 t  
 } "J(#|v0  
 …… //其它处理及默认处理 iivuH2/~?[  
} pX ]K-  
mc_`:I=  
D\8~3S'd  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 :(EU\yCzK  
x0wy3+GZc  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 dxlaoyv:  
E 5PefD\m  
  二、编程步骤 7-81,ADv(  
HABMFv  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; (l : ;p&[  
_|.q?;C]$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; n0#HPI"  
;wCp j9hir  
  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; q: . URl  
:`6E{yfM  
  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; WZaOw w  
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  5、 添加代码,编译运行程序。 v|~ yIywf  
SEQ bw](ss  
三、程序代码 {q%&~  
QSf{V(fs  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL az3rK4g  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \M M(w&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9|O#+_=+v  
#if _MSC_VER > 1000 hRZ9[F[[  
#pragma once 5S:#I5Wa  
#endif // _MSC_VER > 1000 a?%X9 +1A  
#ifndef __AFXWIN_H__ GbG!vo  
#error include 'stdafx.h' before including this file for PCH )6dvWK  
#endif FCU~*c8Cs  
#include "resource.h" // main symbols dL5u-<y&  
class CHookApp : public CWinApp ; 1K[N0xE  
{ 'bj$ZM9  
 public: ZiodJ"r  
  CHookApp(); X<J NwjM%  
  // Overrides FQSepUl  
  // ClassWizard generated virtual function overrides )y-y-B=+T  
  //{{AFX_VIRTUAL(CHookApp) 4;8 Z?.  
 public: C#X|U2$  
  virtual BOOL InitInstance(); =if5$jE3  
  virtual int ExitInstance(); OL&ku &J_  
  //}}AFX_VIRTUAL L2Uk/E  
  //{{AFX_MSG(CHookApp) TGu`r>N51  
  // NOTE - the ClassWizard will add and remove member functions here. T:S+P t~  
  // DO NOT EDIT what you see in these blocks of generated code !  g!5`R`7  
  //}}AFX_MSG x]6OE]]8L  
  DECLARE_MESSAGE_MAP() Zuod1;qIh  
}; t>><|~wp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); tn201TDZ]=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j.X3SQb4G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YuXq   
BOOL InitHotkey(); 'cJHOd  
BOOL UnInit(); hb7H- Z2  
#endif C0;c'4(  
zuR!,-W  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >lxhXYp  
#include "stdafx.h" HjUs}#</  
#include "hook.h" n\&[^Q#b|  
#include <windowsx.h> CGvU{n,"  
#ifdef _DEBUG he;;p="!*  
#define new DEBUG_NEW DU#6%8~  
#undef THIS_FILE S !cc%  
static char THIS_FILE[] = __FILE__; U bT7  
#endif #WlIH7J8Tc  
#define MAX_KEY 100 k2muHKBlk  
#define CTRLBIT 0x04 n%? bMDS  
#define ALTBIT 0x02 jD9 ^DzFx  
#define SHIFTBIT 0x01 gy/z;fB  
#pragma data_seg("shareddata") yU3fM?a  
HHOOK hHook =NULL; uqPagt<  
UINT nHookCount =0; Lh0Pvq0C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vFXih'=_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @D&VOJV  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .p&4]6  
static int KeyCount =0; uG@Nubdwuy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m[,! orq  
#pragma data_seg() xpt*S~  
HINSTANCE hins; OF'y]W&  
void VerifyWindow(); $NzD&b$7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) v)>R)bzqe  
//{{AFX_MSG_MAP(CHookApp) <[Ae 0UK  
// NOTE - the ClassWizard will add and remove mapping macros here.  RSXYz8{  
// DO NOT EDIT what you see in these blocks of generated code! yZ=wT,Y  
//}}AFX_MSG_MAP |13UJ vR  
END_MESSAGE_MAP() @#$5_uU8\(  
a,IE;5kG  
CHookApp::CHookApp() 6hQ?MYX  
{ <rV3(qb#]J  
 // TODO: add construction code here, 3G|n`dj  
 // Place all significant initialization in InitInstance pq$`T|6^  
} 8C3oj  
+gh6eY8  
CHookApp theApp;  chW 1UE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) y`!~JL*  
{ }stc]L{79  
 BOOL bProcessed=FALSE; ~]P_Yd-|  
 if(HC_ACTION==nCode) =B_vQJF2  
 { 4% )I[-sH  
  if((lParam&0xc0000000)==0xc0000000){// Key up )J#7:s]eo  
   switch(wParam) 0L1NZY^!  
   {  2bwf(  
    case VK_MENU: 'Y{fah  
     MaskBits&=~ALTBIT; fF37P8Ir  
     break; ={y Mk  
    case VK_CONTROL: < TJzp  
     MaskBits&=~CTRLBIT; ],9%QE  
     break; Xc -'&"  
    case VK_SHIFT: FB3C'!'<)  
     MaskBits&=~SHIFTBIT; E!w%oTx{OR  
     break; `''\FPhh  
    default: //judge the key and send message V(n7hpS  
     break; ^%tmHDNL.  
   } G$&SlJZEk  
   for(int index=0;index<MAX_KEY;index++){ +x$GwX  
    if(hCallWnd[index]==NULL) ~p^&` FA  
     continue; o_hk!s^4m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =NxT9$V  
    { ~YO99PP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zX{K\yp  
     bProcessed=TRUE; F @ lJk|*_  
    } gSS2)Sd}  
   } ^Rriu $\  
  } q_K8vGm4e  
  else if((lParam&0xc000ffff)==1){ //Key down A7,TM&  
   switch(wParam) R,?7|x  
   { U 1!6%x  
    case VK_MENU: k_$:?$  
     MaskBits|=ALTBIT; ^F/gJ3_;  
     break; 4sOo>.<x  
    case VK_CONTROL: <]#'6'  
     MaskBits|=CTRLBIT; 7jP C{W  
     break; @%mJw u  
    case VK_SHIFT: YD1 :m3l!  
     MaskBits|=SHIFTBIT; X,dOF=OJL  
     break; iX,| ;J|]  
    default: //judge the key and send message V*HkF T  
     break; w4w[qxV>  
   } GqB]^snh  
   for(int index=0;index<MAX_KEY;index++) t_cNH@^3<3  
   { !*#2~$:  
    if(hCallWnd[index]==NULL) I[u%k ir  
     continue; $2N)m:X0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uh#"4-v  
    { HAJK%zLc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CYD&#+o  
     bProcessed=TRUE; 8wJfG Y  
    } w+c%Y\:  
   } ]Q-*xho  
  } CtiTXDc_  
  if(!bProcessed){ $<&N#  
   for(int index=0;index<MAX_KEY;index++){ HX\^ecZ#E  
    if(hCallWnd[index]==NULL) iOk^RDG+  
     continue; ;#a^M*e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zyb>PEd.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); znm3b8ns  
   } v%8.o%G  
  } Bg.~#H  
 } kOi@QLdN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Hg<d%7.  
} VnqgN  
_Ec9g^I10  
BOOL InitHotkey() Kxs_R#k  
{ >6xZF'4  
 if(hHook!=NULL){ >drG,v0qh  
  nHookCount++; CHxu%- g  
  return TRUE; ! *Snx  
 } 4H@:|  
 else #w_cos[I  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7mG/f  
  if(hHook!=NULL) 1yHlBeEC  
   nHookCount++;  {*!L[)  
  return (hHook!=NULL); V}c3}'_U]  
} 53>y<  
BOOL UnInit() tS|gQUF17  
{ DbDi n  
 if(nHookCount>1){ Z]U"i1lA  
  nHookCount--; k0[b4cr`  
  return TRUE; 'vbrzI5m  
 } $,Q0ay  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Vu6$84>-,  
 if(unhooked==TRUE){ A{3VTe4TV  
  nHookCount=0; 3.[ fTrzJ  
  hHook=NULL; #6w\r&R6  
 } %NH#8#';2  
 return unhooked; /Z':wu\  
} 3QNu7oo  
|"t)#BUtL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1>5l(zK!9  
{  hsYS<]  
 BOOL bAdded=FALSE; U tb"6_   
 for(int index=0;index<MAX_KEY;index++){ L;jzDng<  
  if(hCallWnd[index]==0){ :x85:pa  
   hCallWnd[index]=hWnd; `[.b>ztqgJ  
   HotKey[index]=cKey; %ae|4u#b  
   HotKeyMask[index]=cMask; ddR*&.Y!a  
   bAdded=TRUE; \q2:1X |  
   KeyCount++; @D$^- S6  
   break; Tvdg:[V<  
  } s @AGU/v  
 } )w3?o#@  
 return bAdded; =8`!Ph@(  
} _[J @w.l(  
\OR=+\].9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .K I6<k/  
{ e,*E`ol  
 BOOL bRemoved=FALSE; _c[Bjip  
 for(int index=0;index<MAX_KEY;index++){ Wd9y8z;  
  if(hCallWnd[index]==hWnd){ OPi><8x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2L\}  
    hCallWnd[index]=NULL; Nu}x`Qkmr  
    HotKey[index]=0; F@4TD]E0^  
    HotKeyMask[index]=0; TU-aL  
    bRemoved=TRUE; .X2fu/}  
    KeyCount--; `;X~$uS  
    break; rf}@16O$'  
   } 'aj97b;lpG  
  } mI$<+S1!  
 } "#<P--E9  
 return bRemoved; #RfNk;kaA  
} cJp:0'd  
2kG(\+\  
void VerifyWindow() '+ %<\.$  
{ G&2UXr3  
 for(int i=0;i<MAX_KEY;i++){ q$#5>5&  
  if(hCallWnd!=NULL){ E[IjeJB5  
   if(!IsWindow(hCallWnd)){ h\]D:S  
    hCallWnd=NULL; 8:D|[u;iG  
    HotKey=0; `1O<UJX  
    HotKeyMask=0; 397IbZ\  
    KeyCount--; l*l?aI  
   } 3vcKK;qCB  
  } ]x;*Z&  
 } =I(F(AE  
} yUUg8xbpxF  
|IN{8  
BOOL CHookApp::InitInstance() IF>dsAAI<  
{ *F4"mr|\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yX`5x^wVw  
 hins=AfxGetInstanceHandle(); q:iB}ch5R  
 InitHotkey(); -XuRQ_)nG  
 return CWinApp::InitInstance(); .zm/GtOV@  
} `]u!4pP"  
/"q wC  
int CHookApp::ExitInstance() AbqeZn  
{ pgp@Zw)r)k  
 VerifyWindow(); %1\MW+  
 UnInit(); "W"2 Y(  
 return CWinApp::ExitInstance(); \ytF@"7  
} NZ{)&ObBRt  
!@.9>"FU  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 5*~]=(BE  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) PN(P$6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7{"urs7 T  
#if _MSC_VER > 1000 3zr95$Mt  
#pragma once t9C.|6X  
#endif // _MSC_VER > 1000 XA1gV>SJ  
V"A*k^}  
class CCaptureDlg : public CDialog tAi ~i;?  
{ 3?n2/p 7=  
 // Construction b$*1!a  
 public: G C#s;X  
  BOOL bTray; #8{U0 7]"  
  BOOL bRegistered; [9-&Lq_ g  
  BOOL RegisterHotkey(); M15jwR!:M  
  UCHAR cKey; ^9jrI  
  UCHAR cMask; <SPT2NyX  
  void DeleteIcon(); G (Ky7S Z  
  void AddIcon(); ! 0}SZ  
  UINT nCount; NKyKsu  
  void SaveBmp(); "ZHA.M]`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor h<1pGQV  
  // Dialog Data F{'lF^Dc  
  //{{AFX_DATA(CCaptureDlg) o@5zf{-  
  enum { IDD = IDD_CAPTURE_DIALOG }; btG+Ak+K*  
  CComboBox m_Key; #?3oGrS Y  
  BOOL m_bControl; ]cKxYX)J  
  BOOL m_bAlt; u`ezQvrcy  
  BOOL m_bShift; o*r 2T4 8  
  CString m_Path; "/#=8_f  
  CString m_Number; .)Wqo7/Gx  
  //}}AFX_DATA .%x1%TN  
  // ClassWizard generated virtual function overrides W Z_yaG$U  
  //{{AFX_VIRTUAL(CCaptureDlg) 3hD\6,@  
 public: 9w"kxAN  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  mS]&  
 protected: u]<_6;_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +[lv `tr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); uE;bNs'  
  //}}AFX_VIRTUAL o<\u Hr3  
  // Implementation ua8Burl7  
 protected: )%(V.?eW  
  HICON m_hIcon; Q7{/ T0  
  // Generated message map functions X<8   
  //{{AFX_MSG(CCaptureDlg) O8mmS!  
  virtual BOOL OnInitDialog(); O]1aez[  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C1M @;  
  afx_msg void OnPaint(); )8_ x  
  afx_msg HCURSOR OnQueryDragIcon(); Q)s`~G({P  
  virtual void OnCancel(); K}feS(Ji  
  afx_msg void OnAbout(); 3~ptD5@WF  
  afx_msg void OnBrowse(); nf2[hx@=U  
  afx_msg void OnChange(); "<=HmE-;  
 //}}AFX_MSG |jhu  
 DECLARE_MESSAGE_MAP() m\DI6O"u'  
}; \Ctl(uj  
#endif UXdnN;0  
F, 39'<N[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -ld1o+'`v!  
#include "stdafx.h" JNL9t0 x  
#include "Capture.h" 4~DW7 (  
#include "CaptureDlg.h" ; `Vbl_"L  
#include <windowsx.h> `^G?+p2E  
#pragma comment(lib,"hook.lib") >OotgJnhC  
#ifdef _DEBUG Z'cL"n\9R]  
#define new DEBUG_NEW K1oSoD8c  
#undef THIS_FILE Qw@_.I  
static char THIS_FILE[] = __FILE__; u|Tg*B  
#endif ZR*Dl.GWY  
#define IDM_SHELL WM_USER+1 j96\({;k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,?KN;~t#vz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +>BD^[^^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; MRb6O!$`C  
class CAboutDlg : public CDialog '<!T'l:R:/  
{ wj$WE3Y  
 public: 4COo~d  
  CAboutDlg(); hVl^vw7o  
  // Dialog Data tYzpL   
  //{{AFX_DATA(CAboutDlg) JIh:IR(ta  
  enum { IDD = IDD_ABOUTBOX }; +m]Kj3-z@  
  //}}AFX_DATA S @tpd'  
  // ClassWizard generated virtual function overrides o"M h wh  
  //{{AFX_VIRTUAL(CAboutDlg) w\`u |f;Aq  
 protected: r zO5 3\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fKkH [  
  //}}AFX_VIRTUAL syB.Z-Cpd  
  // Implementation UWIw/(Mv/]  
 protected: yRtxh_wr9  
  //{{AFX_MSG(CAboutDlg) tMOhH #  
  //}}AFX_MSG ]IeyJ  
  DECLARE_MESSAGE_MAP() & G8tb>q<V  
}; <xO" E%t  
i&',g  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dHJ#xmE!pP  
{ G Z~W#*|V  
 //{{AFX_DATA_INIT(CAboutDlg) |x$2- RUP  
 //}}AFX_DATA_INIT TZ>_N;jTZ  
} wzNGL{3  
{~a+dEz  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }MCJ$=5  
{ xp;CYr"1}  
 CDialog::DoDataExchange(pDX); /AhN$)(O  
 //{{AFX_DATA_MAP(CAboutDlg) 5* 3T+OK  
 //}}AFX_DATA_MAP :o=a@Rqx  
} 04}" n  
,o68xfdZVW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e 0cVg  
 //{{AFX_MSG_MAP(CAboutDlg) ]s<}'&  
 // No message handlers EN/e`S$)  
 //}}AFX_MSG_MAP #24 eogo~  
END_MESSAGE_MAP() $#LR4 [Fq  
\9 5O  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J%SuiT$L&Y  
: CDialog(CCaptureDlg::IDD, pParent) i?D KKjN$  
{ G}ccf%  
 //{{AFX_DATA_INIT(CCaptureDlg) SZ3UR  
  m_bControl = FALSE; {(j1#9+9  
  m_bAlt = FALSE; N}5'Hk4+  
  m_bShift = FALSE; 3S h#7"K3  
  m_Path = _T("c:\\"); Kh,zp{  
  m_Number = _T("0 picture captured."); '%\FT-{  
  nCount=0; +x_9IvaW&?  
  bRegistered=FALSE; N&K`bmtD  
  bTray=FALSE; 1C]mxV=%  
 //}}AFX_DATA_INIT REc+@;B  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #V#sg}IhM?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c D0-g=&  
} u>-pg u  
\\{+t<?J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) NR|t~C+  
{ .sE5QRVc  
 CDialog::DoDataExchange(pDX); {IR-g,B  
 //{{AFX_DATA_MAP(CCaptureDlg) ro`2IE>  
  DDX_Control(pDX, IDC_KEY, m_Key); w4%yCp[,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <-rw>,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]sL)[o  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bxR6@  
  DDX_Text(pDX, IDC_PATH, m_Path); ^Pp2T   
  DDX_Text(pDX, IDC_NUMBER, m_Number); RW I7eC  
 //}}AFX_DATA_MAP ?vn9HhTD  
} (]gd$BgD  
m?)REE  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9qcA+gz:|  
//{{AFX_MSG_MAP(CCaptureDlg) YRRsbm{  
 ON_WM_SYSCOMMAND() o +KDK{MD  
 ON_WM_PAINT() DITo.PU  
 ON_WM_QUERYDRAGICON() 4SDUTRo a  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <g3)!VR^q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y5,[udF:O  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Md[M}d8  
//}}AFX_MSG_MAP x4=Sm0Ro|V  
END_MESSAGE_MAP() QMAineO  
]qpLaBD  
BOOL CCaptureDlg::OnInitDialog() pEp`Z,p  
{ l>){cI/D#  
 CDialog::OnInitDialog(); ewrs D'?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); o4PJ9x5R!  
 ASSERT(IDM_ABOUTBOX < 0xF000); !9p;%Ny`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c+A$ [  
 if (pSysMenu != NULL) 1XXuFa&  
 { s:ZYiZ-  
  CString strAboutMenu; DElrY)3O.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,*MA teD  
  if (!strAboutMenu.IsEmpty()) ;vuqI5k  
  { xmXuBp:M(R  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2&o jQhe  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 50jZu'z:  
  } +, |aIF  
 } ATzFs]~K;  
 SetIcon(m_hIcon, TRUE); // Set big icon iO@UzD #v  
 SetIcon(m_hIcon, FALSE); // Set small icon JEh(A=Eu>  
 m_Key.SetCurSel(0); SPN5H;{[]K  
 RegisterHotkey(); +S6(Fvp  
 CMenu* pMenu=GetSystemMenu(FALSE); #T3dfVWv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,[UK32KWI  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N5d)&a 7?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); aM7=>  
 return TRUE; // return TRUE unless you set the focus to a control Mj<T+Ohz  
} N}gPf i  
vN9R. R  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) C2}f'  
{ 'zhv#&O  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) L.?QZN%cN  
 { Lvd es.0|  
  CAboutDlg dlgAbout; c]%~X&Tg`  
  dlgAbout.DoModal(); ko{7^]gR  
 } ~YRG9TK  
 else )lZoXt_3  
 { x:$ xtu  
  CDialog::OnSysCommand(nID, lParam); of=N+ W  
 } \k 6'[ln  
} c> 0R_  
%zz,qs)Eu  
void CCaptureDlg::OnPaint() 4G2iT+X-  
{ ["^? vhv  
 if (IsIconic()) ")YD~ZA%)  
 { RJ1 @ a  
  CPaintDC dc(this); // device context for painting f]48-X,^6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UQ#t &  
  // Center icon in client rectangle ;-AC}jG  
  int cxIcon = GetSystemMetrics(SM_CXICON); b/"gUYo  
  int cyIcon = GetSystemMetrics(SM_CYICON); jS ?#c+9  
  CRect rect; NHiac(&*  
  GetClientRect(&rect); Z`<5SHQd  
  int x = (rect.Width() - cxIcon + 1) / 2; _9C,N2a{C  
  int y = (rect.Height() - cyIcon + 1) / 2; $p|Im,  
  // Draw the icon 7 !dj&?  
  dc.DrawIcon(x, y, m_hIcon); :cvT/xhO  
 } \`;1[m  
 else I(H9-!&  
 { uJ`:@Z^J  
  CDialog::OnPaint(); 0`V;;w8  
 } h S)lQl:^  
} {T-=&%||  
H'+3<t>  
HCURSOR CCaptureDlg::OnQueryDragIcon() N[A9J7}_R  
{ Vi`P &uPF  
 return (HCURSOR) m_hIcon;  SQ&}18Z~  
} m Uy>w  
>n3ig~0d  
void CCaptureDlg::OnCancel() sJ{r+wY  
{ EU7nS3K)O~  
 if(bTray) Ma4eu8  
  DeleteIcon(); ++n_$Qug  
  CDialog::OnCancel(); %l?*w~x  
} B@v (ZY  
r KYQ 8T  
void CCaptureDlg::OnAbout() hBaF^AWW  
{ >;lrH&  
 CAboutDlg dlg; #0?3RP  
 dlg.DoModal(); cc3/XBo  
} ?9%$g?3Z  
!L( )3=  
void CCaptureDlg::OnBrowse() M N (o  
{ -BSO$'{7  
 CString str; el\xMe^SY  
 BROWSEINFO bi; r9*6=*J|  
 char name[MAX_PATH]; 8H1&=)M=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nBLb1T  
 bi.hwndOwner=GetSafeHwnd();  [aG   
 bi.pszDisplayName=name; xs )jO+.  
 bi.lpszTitle="Select folder"; JP(0/?Q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tt CC] Q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); cltx(C>   
 if(idl==NULL) Ms5R7<O.7  
  return; ?o`:V|<v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k)[c!\a[i  
 str.ReleaseBuffer(); F(ZczwvR  
 m_Path=str; ]omBq<ox'Y  
 if(str.GetAt(str.GetLength()-1)!='\\') j<6+p r  
  m_Path+="\\"; ef!f4u\  
 UpdateData(FALSE); ggrkj0  
} 1|AY&u%fiP  
p$ETAvD  
void CCaptureDlg::SaveBmp()  -PU.Uw]  
{ ur7S K(#  
 CDC dc; &;`E3$>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l_8ibLyo  
 CBitmap bm; $~j9{*]5  
 int Width=GetSystemMetrics(SM_CXSCREEN); gzy|K%K  
 int Height=GetSystemMetrics(SM_CYSCREEN); Gm3`/!r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); g>#}(u!PH  
 CDC tdc; L "'d(MD  
 tdc.CreateCompatibleDC(&dc); UR S=1+  
 CBitmap*pOld=tdc.SelectObject(&bm); +JM@kdE5b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); w~jm0jK]  
 tdc.SelectObject(pOld); OF )*kiJ  
 BITMAP btm; fU\;\  
 bm.GetBitmap(&btm); "zzb`T[8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Vg :''!4t2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Sqyju3Yp  
 BITMAPINFOHEADER bih; ykH@kv Qt  
 bih.biBitCount=btm.bmBitsPixel; 9qB4\ONXZ  
 bih.biClrImportant=0; a;nYR5f  
 bih.biClrUsed=0; U.b|3E/^  
 bih.biCompression=0; #yU"n-eLR  
 bih.biHeight=btm.bmHeight; 2$VSH&  
 bih.biPlanes=1; ue4 {h  
 bih.biSize=sizeof(BITMAPINFOHEADER); ( z F_<  
 bih.biSizeImage=size; -}( o+!nl  
 bih.biWidth=btm.bmWidth; `*`ZgTV  
 bih.biXPelsPerMeter=0; <b\8<mTr  
 bih.biYPelsPerMeter=0; .7:ecFKk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R9D2cu,{  
 static int filecount=0; 6+"gk(  
 CString name; &p*rEs  
 name.Format("pict%04d.bmp",filecount++); 84i0h$ZZo  
 name=m_Path+name; & .#dZ}J  
 BITMAPFILEHEADER bfh; h?} S|>9  
 bfh.bfReserved1=bfh.bfReserved2=0; 8Bh micU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hd[t&?{=  
 bfh.bfSize=54+size; }odjaM}5Nc  
 bfh.bfOffBits=54; 2+p XtP@O  
 CFile bf; w>}n1Nc$G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )]<^*b>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hJw]hVYa  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &OEBAtc/  
  bf.WriteHuge(lpData,size); ;B(16&l=q  
  bf.Close(); wuXH'  
  nCount++; %da-/[  
 } zwP*7u$CH  
 GlobalFreePtr(lpData); -7o-d-d F  
 if(nCount==1) ac966<#  
  m_Number.Format("%d picture captured.",nCount); _\= /~>Xl  
 else 4cJ/XgX  
  m_Number.Format("%d pictures captured.",nCount); *,*XOd:3TL  
  UpdateData(FALSE); gw%L M7yQR  
} Qw|y%Td8r  
RzFxO  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Jw^my4  
{ UlKg2p  
 if(pMsg -> message == WM_KEYDOWN) LfK/wSvWw  
 { SJi;_bVf  
  if(pMsg -> wParam == VK_ESCAPE) 8]O#L}"  
   return TRUE; ! L3|5:j  
  if(pMsg -> wParam == VK_RETURN) bki:u  
   return TRUE; F[0~{*/|G  
 } _F^NX%  
 return CDialog::PreTranslateMessage(pMsg); +&J1D8  
} bxBndxl  
m5HMtoU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kGakdLl  
{ 8493O x4 O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i=pfjC  
  SaveBmp(); cf*~G x_l  
  return FALSE; JS<w43/j  
} Ad>@8^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $?VYHkX  
 CMenu pop; qLKL*m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #SjCKQ~  
 CMenu*pMenu=pop.GetSubMenu(0); nrXKS&6  
 pMenu->SetDefaultItem(ID_EXITICON); "GJ.`Hj  
 CPoint pt; YB^m!A),I[  
 GetCursorPos(&pt); 6lkCLH  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'P4V_VMK  
 if(id==ID_EXITICON) 1|>bG#|  
  DeleteIcon(); f 9IqcCSW  
 else if(id==ID_EXIT) v |(N  
  OnCancel(); osLEH?iKW  
 return FALSE; MU:v& sk  
} h gwS_L  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HW'I$ .  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ' dv(  
 AddIcon(); s.KfMJ"u[  
 return res; w_LkS/  
} #G?",,&dM  
CWB<I  
void CCaptureDlg::AddIcon() |RqCI9N6  
{ 4$ah~E>,t  
 NOTIFYICONDATA data; LfCgvq6/pO  
 data.cbSize=sizeof(NOTIFYICONDATA); MI.OOoP3a  
 CString tip; U_E t  
 tip.LoadString(IDS_ICONTIP); i3Xo6!Q  
 data.hIcon=GetIcon(0); AP4s_X+=  
 data.hWnd=GetSafeHwnd(); Eq=JmO'gHs  
 strcpy(data.szTip,tip); Bi"cWO  
 data.uCallbackMessage=IDM_SHELL; e ^`La*n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8vfC  
 data.uID=98; <$#^)]Ts  
 Shell_NotifyIcon(NIM_ADD,&data); kKDf%=  
 ShowWindow(SW_HIDE); o4LVG  
 bTray=TRUE; C8 }=fa3u  
} vNZ"x)?  
e ]2GAJLI  
void CCaptureDlg::DeleteIcon() nf:wJ-;*  
{ 2uF'\y  
 NOTIFYICONDATA data; {W%XS E  
 data.cbSize=sizeof(NOTIFYICONDATA); oL!C(\ERh  
 data.hWnd=GetSafeHwnd(); 4Yt'I#*  
 data.uID=98; R+/kx#^  
 Shell_NotifyIcon(NIM_DELETE,&data); W*n|T{n  
 ShowWindow(SW_SHOW); /R6\_oM  
 SetForegroundWindow(); M~Er6Zg  
 ShowWindow(SW_SHOWNORMAL); _=cuOo"!  
 bTray=FALSE; 55,2eg#{O  
} %/!f^PIwX  
!RjC0,  
void CCaptureDlg::OnChange() ,Hp7`I>/  
{ r CUs  
 RegisterHotkey(); kn`O3cW/  
} #&z'?x^a  
$`lGPi(Jc  
BOOL CCaptureDlg::RegisterHotkey() SK*<H~2  
{ (S6>^:;=~  
 UpdateData(); ]IDhE{  
 UCHAR mask=0; V~Jt  
 UCHAR key=0; Tq6\oIBkV  
 if(m_bControl) e#WASHZN  
  mask|=4; OL@$RTh  
 if(m_bAlt) {"rL3Lk  
  mask|=2; gnf4H V~  
 if(m_bShift) 6J cXhlB`  
  mask|=1; wX!0KxR/Z  
  key=Key_Table[m_Key.GetCurSel()]; 8\PI1U  
 if(bRegistered){ b/E3Kse?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); SF"r</c[  
  bRegistered=FALSE; "od 2i\  
 } =t|,6Vp  
 cMask=mask; bY~V?yNgKM  
 cKey=key; I y5)SZ'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \"Qa)1 |  
 return bRegistered; f %q ?  
} o,$K=#Iv  
(SA^> r  
  四、小结 ],'"iVh  
dMI G2log  
  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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