社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 4804阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: E42eOGp9i  
  dr{y0`CCN  
  一、实现方法 -[OXSaf6  
Omi^>c4G  
  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: ?EU\}N J  
|wox1Wt|E  
#pragma data_seg("shareddata") 8h<ehNX ^I  
HHOOK hHook =NULL; //钩子句柄 $6F)R|  
UINT nHookCount =0; //挂接的程序数目 24Z]%+b*E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Pv<FLo%u<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Jdy <w&S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }j1!j&&  
static int KeyCount =0; IMnP[WA!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ecOy6@UDY  
#pragma data_seg() d7cg&9+  
+pH@oFNK  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 n:U>Fj>q  
0Q593F  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: DWt*jX*  
7&O`p(j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )4xu^=N&as  
cKey,UCHAR cMask) %~j2 ('Y  
{ 6|J'>)  
 BOOL bAdded=FALSE; a;$P:C{gj?  
 for(int index=0;index<MAX_KEY;index++){ I8H%=Kb?9  
  if(hCallWnd[index]==0){ IMQ]1uq0$  
   hCallWnd[index]=hWnd; *m+5Pr`7  
   HotKey[index]=cKey; U-0#0}_  
   HotKeyMask[index]=cMask; )a=/8ofe  
   bAdded=TRUE; ^D@b;EyK  
   KeyCount++; ig0u^BC  
   break; b'ml=a#i 0  
  } V 'X;jC  
 } f>$h@/-*  
 return bAdded; &~B5.sppnB  
} 5)zn:$cz  
//删除热键 (1pEEq84  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8_d -81Dd  
{ 1Q}mf!Y  
 BOOL bRemoved=FALSE; TO;.eN!sv  
 for(int index=0;index<MAX_KEY;index++){ g^kx(p<u`  
  if(hCallWnd[index]==hWnd){ ? 8 1X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,pq{& A  
    hCallWnd[index]=NULL; W v!<bT8r  
    HotKey[index]=0; N0n^L|(R  
    HotKeyMask[index]=0; d~ng6pA  
    bRemoved=TRUE; nY `2uN~9  
    KeyCount--; g"Q h]:  
    break; 5;)*T6Y  
   } %Hi~aRz  
  } |!d"*.Q@F  
 } v| z08\a[  
 return bRemoved; %K 4  
} 2 Tvvq(?T  
h5|.Et  
+rNkN:/L  
  DLL中的钩子函数如下: TrE3S'EU#R  
tn/T6C^)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <XQ.A3SG!  
{ cJn HW  
 BOOL bProcessed=FALSE; mnF}S5[9  
 if(HC_ACTION==nCode) }xn_6  
 { vxN0,l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h3u1K>R)  
   switch(wParam) ]_*S~'x  
   {  ED![^=  
    case VK_MENU: ARh6V&Hi-  
     MaskBits&=~ALTBIT; OQlG+|  
     break; KA]*ox6j;  
    case VK_CONTROL: p4X{"Z\mn  
     MaskBits&=~CTRLBIT; =G-N` 39  
     break; 1M%S gV-#  
    case VK_SHIFT: }4%/pOi:f  
     MaskBits&=~SHIFTBIT; ]Ql 0v"` F  
     break; us)*2`?6t  
    default: //judge the key and send message H5wb_yBQ+  
     break; H!IDV }dn  
   } %4>x!{jwV  
   for(int index=0;index<MAX_KEY;index++){ >tRHNB_  
    if(hCallWnd[index]==NULL) i 6no;}j  
     continue; d-!<C7O}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8zQfY^/{M  
    { !ZtSbOC'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MW Wu@SY  
     bProcessed=TRUE; Ar, 9U9  
    } Edt}",s7  
   } $v;dV@tB  
  } P-z`c\Rt  
  else if((lParam&0xc000ffff)==1){ //有键按下 8IY19>4'5J  
   switch(wParam) yOHXY&  
   { 3" Vd==oK~  
    case VK_MENU: e(\I_  
     MaskBits|=ALTBIT; _Sj}~ H  
     break; ;q#]-^  
    case VK_CONTROL: 32XS`Z  
     MaskBits|=CTRLBIT; ^nDal':*  
     break; OOy}]uYF`  
    case VK_SHIFT:  u>cC O'q  
     MaskBits|=SHIFTBIT; 6p<`h^  
     break; ?{J!#`tfV  
    default: //judge the key and send message :.IN?X  
     break; ):6 -  
   } {E,SHh   
   for(int index=0;index<MAX_KEY;index++){ )3E,D~1e%  
    if(hCallWnd[index]==NULL) cwtD@KC[B  
     continue; H:oQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SX+RBVZU  
    { 8:g!w:$x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); k khE}qSD  
     bProcessed=TRUE; -Wo15O"  
    } ]EL\)xCr  
   } RtF8A5ys  
  } -Wjh**  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4~u9B/v  
   for(int index=0;index<MAX_KEY;index++){ G!-J$@P  
    if(hCallWnd[index]==NULL) 13f<0wg  
     continue; ,ECAan/@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .gD km^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Enj_tJs  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LM,fwAX  
   } !*a[jhx  
  } f]_mzF=&  
 } w7Dt1axB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F1u)i  
} #\FT EY!  
Gt^d;7x]  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~$aTM_4  
n9}RW;N+u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YF[$Q=7.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \|+/0 USn  
>[3X]n,0  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: r,'O ).7  
/7p>7q 9g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #( uj$[o  
{ <'*4j\*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) G(OFr2M  
 { z\Ui8jo:;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Ml`vx  
  SaveBmp(); i>GdRG&q  
  return FALSE; )/%S=c  
 } 84`rbL!M  
 …… //其它处理及默认处理 GXeAe}T  
} HF4Lqh'oco  
XS/n>C  
V*qY"[   
  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。 .uDM_ 34  
fv==Gu%{  
  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。 @36S}5Oa  
YX;nMyD?~  
  二、编程步骤 FzhT$7Gw  
A'g,:8Ou  
  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"; C_-E4I Z)  
W8* 2;F]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; BJIQ zn3  
0zV 4`y  
  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; W78o*z[O  
wgZrrq/W|  
  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; $^$ECDOTB  
HDj$"pS  
  5、 添加代码,编译运行程序。 Tk+DPp^  
$c9=mjwH  
三、程序代码 #WEq-0L   
kIM C~Z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL x7gjG"V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ak2dn]]D  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ CKC0{J8g  
#if _MSC_VER > 1000 4<Kgmy  
#pragma once F@<MT<TRf  
#endif // _MSC_VER > 1000 _80ns&q  
#ifndef __AFXWIN_H__ vf_OQ4'G,  
#error include 'stdafx.h' before including this file for PCH 2FT-}w0;  
#endif AfE%a-;:  
#include "resource.h" // main symbols ZY Kd  
class CHookApp : public CWinApp G+C} <S}  
{ n_;S2KM  
 public: ,aO@.<"  
  CHookApp(); y< ud('D  
  // Overrides Bm<^rhJ9  
  // ClassWizard generated virtual function overrides 9l l|JeNi  
  //{{AFX_VIRTUAL(CHookApp) J0qXtr%h\  
 public: qb$_xIQpDL  
  virtual BOOL InitInstance(); 8r^j P.V  
  virtual int ExitInstance(); MCd F!{  
  //}}AFX_VIRTUAL i* gKtjx  
  //{{AFX_MSG(CHookApp) "aA_(Ydzj  
  // NOTE - the ClassWizard will add and remove member functions here. <?4cWp|i  
  // DO NOT EDIT what you see in these blocks of generated code ! -pX|U~a[  
  //}}AFX_MSG jJ-d/"(  
  DECLARE_MESSAGE_MAP() a 8-;   
}; MLeX;He  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `:3&@.{T(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {g@A>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j`Nh7+qs  
BOOL InitHotkey(); ITQ9(W Un  
BOOL UnInit(); _/ Tlqzp  
#endif 25&nwz  
-$m@*L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g z`*|h  
#include "stdafx.h" z+Z%H#9e  
#include "hook.h" ' 3VqkQ4  
#include <windowsx.h> @ AggznA8  
#ifdef _DEBUG O(Td:Zdp  
#define new DEBUG_NEW '2xcce#  
#undef THIS_FILE wzbz }P>  
static char THIS_FILE[] = __FILE__; _f66>a<  
#endif a+'}XEhSC:  
#define MAX_KEY 100 R( GmU4  
#define CTRLBIT 0x04 O&=KlnI:  
#define ALTBIT 0x02 FdM<;}6T  
#define SHIFTBIT 0x01 g~|y$T  
#pragma data_seg("shareddata") R9q0,yQW  
HHOOK hHook =NULL; ;x16shH  
UINT nHookCount =0; 6~3jn+K$1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -O /T?H  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "Whwc   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~R$[n.Vpk  
static int KeyCount =0; a>?p.!BM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bZK+9IR  
#pragma data_seg() YPG,9iZ&f  
HINSTANCE hins; hw|t8 ShW  
void VerifyWindow(); cp|:8 [  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) n{z8Ao%  
//{{AFX_MSG_MAP(CHookApp) iA&oLu[y3  
// NOTE - the ClassWizard will add and remove mapping macros here. ^+URv  
// DO NOT EDIT what you see in these blocks of generated code! >mew"0Q  
//}}AFX_MSG_MAP KZZOi:  
END_MESSAGE_MAP() L1rA T  
Pwg/Vhfh  
CHookApp::CHookApp() gINwvzW{  
{ "B~WcC  
 // TODO: add construction code here, _Ws#UL+Nq  
 // Place all significant initialization in InitInstance sl%#u9r=  
} zF=#6  
&b!vWX1N  
CHookApp theApp; L2<+#O#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Mc!2mE%47m  
{ dA|Lufy#  
 BOOL bProcessed=FALSE; !2#\| NJk  
 if(HC_ACTION==nCode) Q|Nzbmwh  
 { 4p?+LdL  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,T/GW,?  
   switch(wParam) &+,:u*%  
   { P:>'   
    case VK_MENU: iF8@9m  
     MaskBits&=~ALTBIT; #gF2(iK6  
     break; ^uM_b  
    case VK_CONTROL: BB0g}6M  
     MaskBits&=~CTRLBIT; /G{&[X<4U  
     break; 8NxUx+]  
    case VK_SHIFT: 4bPqmEE  
     MaskBits&=~SHIFTBIT; Kq8 (d`g}  
     break; sC!1B6:  
    default: //judge the key and send message >,kL p|gA  
     break; F9v)R #u~  
   } "OVi /:*B  
   for(int index=0;index<MAX_KEY;index++){ 0 -!?W  
    if(hCallWnd[index]==NULL) ^M [#^wv,  
     continue; =A$Lgk>|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GA(OK-WUd  
    { AL(n *,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^dheJ]n=k  
     bProcessed=TRUE; [y_yPOv  
    } /4(Z`e;0  
   } 'lxLnX  
  } }!eF  
  else if((lParam&0xc000ffff)==1){ //Key down \moZ6J  
   switch(wParam) !p-'t]  
   { 2;3x,<Cg  
    case VK_MENU: M\9at\$  
     MaskBits|=ALTBIT; l#tS.+B7  
     break; ?OdV1xB  
    case VK_CONTROL: UB5}i('L  
     MaskBits|=CTRLBIT; 1d=0q?nH  
     break; j~X j  
    case VK_SHIFT: 6.k^m&-A  
     MaskBits|=SHIFTBIT; qw6EPC  
     break; UIO6|*ka  
    default: //judge the key and send message ^xzE^"G6  
     break; an-\k*w  
   } [t {vYo  
   for(int index=0;index<MAX_KEY;index++) _e;N'DZ  
   { O\LjtMF  
    if(hCallWnd[index]==NULL) !1D%-=dWX  
     continue; FAH[5VD r%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "ugX /r$_  
    { :yd=No@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5wT' ,U"+  
     bProcessed=TRUE; l0eANB%Y=@  
    } 9"m, p  
   } qJ#L)  
  } |3s.;w K  
  if(!bProcessed){ *K]>}  
   for(int index=0;index<MAX_KEY;index++){ eUX@9eML  
    if(hCallWnd[index]==NULL) iSnIBs9\  
     continue; }K#iCby4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vww@eK%5Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;+S2h-4  
   } plzE  
  } pA*D/P-  
 } zfk'>_'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); EG'7}W  
} +J\L4ri k  
p*A^0DN'Fn  
BOOL InitHotkey() .q AQP L  
{ >:3xi{  
 if(hHook!=NULL){ e-nWD  
  nHookCount++; Rh wt<  
  return TRUE; $xKg }cO  
 } i n[n A a  
 else }`+O$0A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dL1~]Z y  
  if(hHook!=NULL) _Ym&UY.u#  
   nHookCount++; >VpP/Qf  
  return (hHook!=NULL); ^G ]KE8  
} 0S)"Q^6n y  
BOOL UnInit() Hj}g1"RA  
{ z'5;f;  
 if(nHookCount>1){ ^4n2 -DvG  
  nHookCount--; Ws2prh^e(  
  return TRUE;  9OrA9r  
 } >WGX|"!"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m]+X }|  
 if(unhooked==TRUE){ Y!K^-Y}  
  nHookCount=0; 9+WY@du+  
  hHook=NULL; *Y| lO  
 } Bbn832iMUY  
 return unhooked; #o(?g-3  
} *!-}lc^4  
h$#4ebp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (.jO:#eE%  
{ I v 80,hW  
 BOOL bAdded=FALSE; z|t.y.JX  
 for(int index=0;index<MAX_KEY;index++){ lW{I`r\]  
  if(hCallWnd[index]==0){ *so6]+)cU  
   hCallWnd[index]=hWnd; ,*9#c*'S  
   HotKey[index]=cKey; =RCfibT!C  
   HotKeyMask[index]=cMask; ; /6:lL  
   bAdded=TRUE; {,nd_3"Vq  
   KeyCount++; @LwVmR |{  
   break; %8bFQNd  
  } ~FK+bF?%  
 } 7LyV`6{70  
 return bAdded; cOj +}Hz58  
} V^/h;/! ^  
BP7<^`i&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yKX:Z4I/  
{ vZ1D3ytfG  
 BOOL bRemoved=FALSE; QjW~6Z.tI  
 for(int index=0;index<MAX_KEY;index++){ *YiD B?Si  
  if(hCallWnd[index]==hWnd){ H4K(SGx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ m\R@.jkZ  
    hCallWnd[index]=NULL; 8ESkG  
    HotKey[index]=0; _BeX7  
    HotKeyMask[index]=0; gn;nS{A  
    bRemoved=TRUE; f"} 0j|Gg  
    KeyCount--; ;I0yQlx|U  
    break; a8lo!e9q  
   } 'xu7AKpU)  
  } N@%xLJF=N>  
 }  ^qSf  
 return bRemoved; qB` 0^V  
} qqO10~Xc  
8&`T<ECq>  
void VerifyWindow() v]d?6g  
{ I%VV4,I&pK  
 for(int i=0;i<MAX_KEY;i++){ 7@e[:>e  
  if(hCallWnd!=NULL){ U3VsMV*Y  
   if(!IsWindow(hCallWnd)){ N?`GZ+5  
    hCallWnd=NULL; R[ +]d|L  
    HotKey=0; MOH,'@&6^  
    HotKeyMask=0; do :RPZ!  
    KeyCount--; 5BGv^Qb_2  
   } `siy!R  
  } xr1I8 5kM  
 } 0lJBtk9wn  
} N|^!"/  
5u=U--  
BOOL CHookApp::InitInstance() 1nX68fS.9  
{ S quqaX+<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z)Xq!]~/g  
 hins=AfxGetInstanceHandle(); pqNoL* H  
 InitHotkey(); Di5Op(S((  
 return CWinApp::InitInstance(); w-q=.RSTn=  
} CsQ}P)  
_#\5]D~""  
int CHookApp::ExitInstance() N]<~NG:6b  
{ F0o18k_"  
 VerifyWindow(); Ov{B-zCA  
 UnInit(); J3!k*"P  
 return CWinApp::ExitInstance(); f|HgLFx  
} 8mQd*GGu1  
mSvTnd8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EZu  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "}azC|:5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ R}=]UOqH-  
#if _MSC_VER > 1000 m<VL19o>R  
#pragma once B+e~k?O]1  
#endif // _MSC_VER > 1000 xX67bswG  
0$dY;,Q.  
class CCaptureDlg : public CDialog 'rcsK  
{ | Y,X=Ed  
 // Construction XQ?)  
 public: a6K$omu  
  BOOL bTray; 4QN6BZJ5  
  BOOL bRegistered; v |hKf6  
  BOOL RegisterHotkey(); Bg 8t'dw?K  
  UCHAR cKey; O'?lW~CD.>  
  UCHAR cMask; M3xi 0/.  
  void DeleteIcon(); )-6[ Bw  
  void AddIcon(); wE=8jl*  
  UINT nCount; NIcNL(]  
  void SaveBmp(); v(WL 3[y;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor u>-uRz<)t  
  // Dialog Data rBL_]\$7}  
  //{{AFX_DATA(CCaptureDlg) D/!G]hx  
  enum { IDD = IDD_CAPTURE_DIALOG }; :O2v0Kx  
  CComboBox m_Key; )-7(Hv1  
  BOOL m_bControl; ?(XX  
  BOOL m_bAlt; UW~tS  
  BOOL m_bShift; JO;` Kz_$  
  CString m_Path; TTjjyZ@  
  CString m_Number; )}k`X<~k  
  //}}AFX_DATA >?Y3WPB<F  
  // ClassWizard generated virtual function overrides !-Tmu  
  //{{AFX_VIRTUAL(CCaptureDlg) ~o\]K  
 public: WW Kr & )  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "Mu $3 w  
 protected: .cn w?EI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support jq]\oY8y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]{l O  
  //}}AFX_VIRTUAL ;Q%19f3,6  
  // Implementation ckkM)|kK  
 protected: L``mF(R^  
  HICON m_hIcon; =dJEcC_J  
  // Generated message map functions Mdq'> <ajL  
  //{{AFX_MSG(CCaptureDlg) N_~Wu  
  virtual BOOL OnInitDialog(); v,O&UrZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vmQ DcCw  
  afx_msg void OnPaint(); Ymh2qGcj]8  
  afx_msg HCURSOR OnQueryDragIcon(); UHm+5%ZC  
  virtual void OnCancel(); L&F\"q9q71  
  afx_msg void OnAbout(); wz2)seZY  
  afx_msg void OnBrowse(); Lzb [%?  
  afx_msg void OnChange(); DL/*t.)"et  
 //}}AFX_MSG W!Os ci  
 DECLARE_MESSAGE_MAP() kO O~%|1CP  
}; O#ajoE  
#endif xo@/k   
{hp@j#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S+=@d\S}"  
#include "stdafx.h" D"><S<C\C  
#include "Capture.h" &rE l  
#include "CaptureDlg.h" oz7udY=]0  
#include <windowsx.h> OTbjZ(  
#pragma comment(lib,"hook.lib") {d5ur@G1  
#ifdef _DEBUG G7#~=W 2M  
#define new DEBUG_NEW xn#I7]]G  
#undef THIS_FILE -)c"cgx.  
static char THIS_FILE[] = __FILE__; yvnrZ&x :  
#endif oHGf |  
#define IDM_SHELL WM_USER+1 E;*TRr><  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C3 c|@7FU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h3 ZL0Fi*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G?X,Y\Lp  
class CAboutDlg : public CDialog [}Yci:P_ +  
{ j;c ^pLUP  
 public: Y@xeyMzE  
  CAboutDlg(); 9(\N+  
  // Dialog Data I;PO$T  
  //{{AFX_DATA(CAboutDlg) d3hTz@JY  
  enum { IDD = IDD_ABOUTBOX }; BwA~*5TFu  
  //}}AFX_DATA N1zrfn-VU  
  // ClassWizard generated virtual function overrides LWR &(p.%  
  //{{AFX_VIRTUAL(CAboutDlg) -|UX}t*  
 protected: }E] &13>r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2G*#Czr"  
  //}}AFX_VIRTUAL `e:RZ  
  // Implementation UmMYe4LQR  
 protected: rb4g<f|  
  //{{AFX_MSG(CAboutDlg) "pJ EzC  
  //}}AFX_MSG N>#P 1!eP  
  DECLARE_MESSAGE_MAP() (4gQe6tA  
}; dQoMAsxzM  
H_^u_ %:e  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `SpS?mWA  
{ 00 ,j neF  
 //{{AFX_DATA_INIT(CAboutDlg) [WSIC *|;  
 //}}AFX_DATA_INIT X"r$,~  
} V)?g4M3}  
JqIv&W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ya {1/AaM  
{ L{ ^@O0S  
 CDialog::DoDataExchange(pDX); }Bg<Fm  
 //{{AFX_DATA_MAP(CAboutDlg) icbYfgQ  
 //}}AFX_DATA_MAP YZ+g<HXB  
} sX?7`n1U  
UjK&`a ;V  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^d=@RTyo/  
 //{{AFX_MSG_MAP(CAboutDlg) Jm^jz  
 // No message handlers nf^k3QS\  
 //}}AFX_MSG_MAP t|,Ex7  
END_MESSAGE_MAP() e;Z`&  
+ opN\`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9`VF [* 9  
: CDialog(CCaptureDlg::IDD, pParent) VZ!$'??  
{ u$^` hzfI  
 //{{AFX_DATA_INIT(CCaptureDlg) jiD8|%}v  
  m_bControl = FALSE; a#j^gu$m  
  m_bAlt = FALSE; xJ.!Q)[  
  m_bShift = FALSE; q/G5aO*  
  m_Path = _T("c:\\"); CzbNG^+  
  m_Number = _T("0 picture captured."); +u)$o  
  nCount=0; s$G8`$+i1  
  bRegistered=FALSE; OlFn<:V K  
  bTray=FALSE; jv^ L~<u  
 //}}AFX_DATA_INIT .DsYR/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^aMdbB  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~n\ea:.  
} -L3RzX  
^@> Qiy  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +Ea X S  
{ X Y?@^  
 CDialog::DoDataExchange(pDX); )o,0aGo>Of  
 //{{AFX_DATA_MAP(CCaptureDlg) CT`X~y10  
  DDX_Control(pDX, IDC_KEY, m_Key); }Elce}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); cW%O-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jg/<"/E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .k(_ j.v  
  DDX_Text(pDX, IDC_PATH, m_Path); md s\~l73  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !d )i6W?  
 //}}AFX_DATA_MAP ?5gpk1  
} EF~PM  
pdu  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2J;CiEB  
//{{AFX_MSG_MAP(CCaptureDlg) +.uk#K0o  
 ON_WM_SYSCOMMAND() '1nU[,Wj  
 ON_WM_PAINT() |Q;1;QXd  
 ON_WM_QUERYDRAGICON() T`;M!-)2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V0(ABi:d  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1\kehCt  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PTqS L]  
//}}AFX_MSG_MAP TR20{8"  
END_MESSAGE_MAP() <ZdNPcT<s  
}aIf IJ  
BOOL CCaptureDlg::OnInitDialog() 'kK%sE   
{ ,:{+ H  
 CDialog::OnInitDialog(); SsZzYj.d  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3!W&J  
 ASSERT(IDM_ABOUTBOX < 0xF000); RkM!BcB  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b>WT-.b0  
 if (pSysMenu != NULL) )P])0Y-  
 { 8m0sEV>  
  CString strAboutMenu; >S]')O$c  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;{20Heuz  
  if (!strAboutMenu.IsEmpty()) tTt~W5lo  
  { TQH#sx  
   pSysMenu->AppendMenu(MF_SEPARATOR); +Eg# 8/q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); * vD<6qf  
  } P!EX;+7+x  
 } g7-K62bb  
 SetIcon(m_hIcon, TRUE); // Set big icon ^Quy64M  
 SetIcon(m_hIcon, FALSE); // Set small icon RJD3o_("K  
 m_Key.SetCurSel(0); U4JN,`p{  
 RegisterHotkey(); ] fB{  
 CMenu* pMenu=GetSystemMenu(FALSE); GAKJc\o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <rs]@J'p  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 470Pig>I8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); DAi[3`C  
 return TRUE; // return TRUE unless you set the focus to a control t1S~~FLE  
} Qt 2hb  
^p/mJ1/s7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cO9Aw!  
{ 2hP8ZfvIR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .VT,,0  
 { 6np wu5!  
  CAboutDlg dlgAbout; >wwEa4   
  dlgAbout.DoModal(); 5JXLfYTUI  
 } (WvA9s{/  
 else aT#|mk=\  
 { 0 M?}S~p]  
  CDialog::OnSysCommand(nID, lParam); ><~hOK?v  
 } I5]zOKlVR  
} w0iE x1i  
rB]/N,R   
void CCaptureDlg::OnPaint() u.6%n. g  
{ F ReK  
 if (IsIconic()) T*m_rDDt  
 { 9`AQsZ2  
  CPaintDC dc(this); // device context for painting U^D7T|P$V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b8&9pLl  
  // Center icon in client rectangle 6s;x@g]  
  int cxIcon = GetSystemMetrics(SM_CXICON); |(5=4j]  
  int cyIcon = GetSystemMetrics(SM_CYICON); z?xd\x  
  CRect rect; |1o]d$3m  
  GetClientRect(&rect); 8z"Yo7no  
  int x = (rect.Width() - cxIcon + 1) / 2; [@;Z xs  
  int y = (rect.Height() - cyIcon + 1) / 2; :|Cf$2k7  
  // Draw the icon 9tO_hhEQ@  
  dc.DrawIcon(x, y, m_hIcon); Ai;Pht9qi  
 } _1ins;c52  
 else Qs a2iw{  
 { \z 'noc  
  CDialog::OnPaint(); yr?\YKV)I  
 } 566EMy|  
} -/X-.#}-  
2ip~qZNw><  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9}N*(PI  
{ zPe .  
 return (HCURSOR) m_hIcon; i{2KMa{K  
} P;34Rd  
YQ/ *|  
void CCaptureDlg::OnCancel() z5I<,[`  
{ _PF><ODX2  
 if(bTray) q2y:b qLWl  
  DeleteIcon(); @p;4g_F  
  CDialog::OnCancel(); Dts:$PlCk  
} uw]Jm"=w  
ryN-d%t?  
void CCaptureDlg::OnAbout() |d K-r  
{ /+u*9ZR&1  
 CAboutDlg dlg; DWAU8>c+  
 dlg.DoModal(); H\T h4teE  
} `8I&(k<wLe  
@OpcS>:R  
void CCaptureDlg::OnBrowse() ; OsN^   
{ Hi Yx(hY  
 CString str; %}/)_RzQ  
 BROWSEINFO bi; 4J  s>yP  
 char name[MAX_PATH]; r"+ WUU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); kcle|B  
 bi.hwndOwner=GetSafeHwnd(); ;1KhUf;&F  
 bi.pszDisplayName=name; 3; A1[E6K  
 bi.lpszTitle="Select folder"; y$ WS;#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; IX}l)t[:(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); E] [DVY  
 if(idl==NULL) bpkn[K"(  
  return; GCrN:+E0FJ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); x;+,lP  
 str.ReleaseBuffer(); (H$eXW7  
 m_Path=str; \ys3&<;b  
 if(str.GetAt(str.GetLength()-1)!='\\') m+gVGK  
  m_Path+="\\"; aUnm9u r  
 UpdateData(FALSE); &IcDUr]L  
} -Je+7#P1  
rP'oU V_  
void CCaptureDlg::SaveBmp() &+\wYa,  
{ ;(XSw%Y H  
 CDC dc; SV.*Z|"^N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); m2;%|QE(  
 CBitmap bm; ;BqX=X+#  
 int Width=GetSystemMetrics(SM_CXSCREEN); E$cr3 t7Xy  
 int Height=GetSystemMetrics(SM_CYSCREEN); +wmfl:\^{H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); >,DR{A2hSB  
 CDC tdc; +"<f22cS1  
 tdc.CreateCompatibleDC(&dc); "-a>Uj")%  
 CBitmap*pOld=tdc.SelectObject(&bm); yH Cc@`1.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J(Bn  n  
 tdc.SelectObject(pOld); '&"7(8E} *  
 BITMAP btm; V #=N?p  
 bm.GetBitmap(&btm); 6c2fqAF>i  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; BjA|H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3yTBkFI!  
 BITMAPINFOHEADER bih; /fX]Yu  
 bih.biBitCount=btm.bmBitsPixel; $1axZ~8sS  
 bih.biClrImportant=0; O @w=  
 bih.biClrUsed=0; H:|yu  
 bih.biCompression=0; <a'j8pw9i  
 bih.biHeight=btm.bmHeight; |Oo WGVc  
 bih.biPlanes=1; f~]5A%=cZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); WYq, i}S  
 bih.biSizeImage=size; \UXQy{Ex  
 bih.biWidth=btm.bmWidth; PgVM>_nHk  
 bih.biXPelsPerMeter=0; ar6Z?v$  
 bih.biYPelsPerMeter=0; 3LEN~ N}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DU;]Q:r{  
 static int filecount=0; A) qOJ(OEz  
 CString name; '8dqJ`Gj  
 name.Format("pict%04d.bmp",filecount++); pPIH`Iq  
 name=m_Path+name; Va1|XQ<CL  
 BITMAPFILEHEADER bfh; I} j! !  
 bfh.bfReserved1=bfh.bfReserved2=0; S`NH6?/uH  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ~sM334sQ  
 bfh.bfSize=54+size; zNB G;\ W  
 bfh.bfOffBits=54; qWWy}5SOm  
 CFile bf; C4b3ZcD2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *bR _ C"-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); FCg,p2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0hPm,H*Y]  
  bf.WriteHuge(lpData,size); .9`.\v6R  
  bf.Close(); 0py0zE6,,  
  nCount++; Sna7r~ j  
 } 2^|*M@3r  
 GlobalFreePtr(lpData); j3$KYf`T}  
 if(nCount==1) f1Rm9``  
  m_Number.Format("%d picture captured.",nCount); RNm/&F1C$  
 else _Wgg=A"G  
  m_Number.Format("%d pictures captured.",nCount); jML}{>Gy8S  
  UpdateData(FALSE); -`rz[";n  
} ](%-5G1<  
r1,RloyZS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,#s}nJ4  
{ 9D&ocV3QV  
 if(pMsg -> message == WM_KEYDOWN) grv 3aa@  
 { xNT[((  
  if(pMsg -> wParam == VK_ESCAPE) : G<1   
   return TRUE; OYe @P  
  if(pMsg -> wParam == VK_RETURN) .rwZ`MP  
   return TRUE; ,UY],;ib  
 } ^G5 _d"Gr  
 return CDialog::PreTranslateMessage(pMsg); [~$9n_O94  
} 42Z2Mjtk  
J.~$^-&!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N8:vn0ww  
{ Cfa?LgSz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KpSHf9!&[  
  SaveBmp(); Y@Ty_j~  
  return FALSE; [7$.)}Q-  
} '#^ONnSTn  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~]}7|VN.}  
 CMenu pop; PE3l2kr  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y+@7k3"  
 CMenu*pMenu=pop.GetSubMenu(0); =T!M`  
 pMenu->SetDefaultItem(ID_EXITICON); S?;&vs9j  
 CPoint pt; 9^ )=N=wV  
 GetCursorPos(&pt); #p0vrQ;5f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'r3I/qg*m  
 if(id==ID_EXITICON) zxXm9zrLo  
  DeleteIcon(); "`16-g97  
 else if(id==ID_EXIT) ]>&au8  
  OnCancel(); Rs7=v2>I  
 return FALSE; &d=j_9   
} ~fEgrF d  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c_+}`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q0$}MB6  
 AddIcon(); Xn4U!<RT"  
 return res; }VdohX-  
} jeC3}BL }  
DjtUX>e  
void CCaptureDlg::AddIcon() 1Qv5m^>vj  
{ ]r{y+g|  
 NOTIFYICONDATA data; Q R;Xj3]v  
 data.cbSize=sizeof(NOTIFYICONDATA);   "Qm  
 CString tip; e5C560  
 tip.LoadString(IDS_ICONTIP); }>>BKn   
 data.hIcon=GetIcon(0); V{ECDg P  
 data.hWnd=GetSafeHwnd(); a*! wiTGf  
 strcpy(data.szTip,tip); ux'!1mN  
 data.uCallbackMessage=IDM_SHELL; r:<UV^; 9l  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X& pK#=  
 data.uID=98; p Gzzv{H  
 Shell_NotifyIcon(NIM_ADD,&data); ,{=#  
 ShowWindow(SW_HIDE); < OCy  
 bTray=TRUE; eVn]/.d  
} 89@gYA"Su  
YqrieDFay!  
void CCaptureDlg::DeleteIcon() 3Jf_3c  
{ d A[I  
 NOTIFYICONDATA data; hgLwxJu  
 data.cbSize=sizeof(NOTIFYICONDATA); V!(Ty%7  
 data.hWnd=GetSafeHwnd(); V'^Hn?1^  
 data.uID=98; D!+d]A[r  
 Shell_NotifyIcon(NIM_DELETE,&data); .sgP3Ah  
 ShowWindow(SW_SHOW); .e~17}Ka}  
 SetForegroundWindow(); `~F=  
 ShowWindow(SW_SHOWNORMAL); *{/BPc0*  
 bTray=FALSE; txw:m*(%  
} 4DaLmQ2O  
9])dLL0  
void CCaptureDlg::OnChange() V)=!pT  
{ *xI0hFJIM  
 RegisterHotkey(); O'*KNJX  
} e3}`]  
V*"-@  
BOOL CCaptureDlg::RegisterHotkey() :'|%~&J  
{ F$F,I,$ "  
 UpdateData(); ?I6!m~  
 UCHAR mask=0; \ym3YwP4/:  
 UCHAR key=0; &;DK^ta*P  
 if(m_bControl) $i;%n1VBg  
  mask|=4; 1 \:5ow&a  
 if(m_bAlt) R<I)}<g(A3  
  mask|=2; bk44 qL;8  
 if(m_bShift) JmjqA Dex  
  mask|=1; Ko|nF-r_  
  key=Key_Table[m_Key.GetCurSel()]; 8GgZAu'X  
 if(bRegistered){ h(l4\)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]yiwdQ  
  bRegistered=FALSE; 2x<,R/}  
 } ;shhg z$  
 cMask=mask; UJ* D  
 cKey=key; qwM71B!r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ZxF RE#y~2  
 return bRegistered; F<39eDNpz  
} -|YG**i/  
)!z<q}i5  
  四、小结 n** W  
dZ K /v  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八