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
  • 5544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: ^ZV xBQKg  
  KYeA=  
  一、实现方法 A 7sej  
E dU3k'z$  
  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: 6Qo6 T][  
iff U}ce  
#pragma data_seg("shareddata") "=RB #  
HHOOK hHook =NULL; //钩子句柄 p3Gj=G  
UINT nHookCount =0; //挂接的程序数目 N[mOJa:  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ea3tF0{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G{s ,Y^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey M0]fh5O  
static int KeyCount =0; 11)~!in  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vi=yR  
#pragma data_seg() IAtZ-cM<  
H;Bj\-Pa  
  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。 bM!`C|,[s  
mki=.l$O  
  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: Kp99y  
EZ=M^0=Hpf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?e ~*,6  
cKey,UCHAR cMask) gF:wdcO  
{ A^m hPBT_  
 BOOL bAdded=FALSE; ROfmAc  
 for(int index=0;index<MAX_KEY;index++){ .Kv@p jOr  
  if(hCallWnd[index]==0){ x~mXtqg  
   hCallWnd[index]=hWnd; %?cPqRHJ ~  
   HotKey[index]=cKey; "JGaw_o  
   HotKeyMask[index]=cMask; NR3IeTd  
   bAdded=TRUE; )-sEm`(`I9  
   KeyCount++; eygyVhJ  
   break; ES+&e/G"ds  
  } >0m-S :lk  
 } .)o5o7H  
 return bAdded; nd?m+C&W  
} .p5*&i7  
//删除热键 <^&'r5H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sO*6F`eiZ  
{ HY42G#^  
 BOOL bRemoved=FALSE; SHaZ-d  
 for(int index=0;index<MAX_KEY;index++){ vuK 5DG4  
  if(hCallWnd[index]==hWnd){ QO%LSRw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ar{e<&Bny  
    hCallWnd[index]=NULL; >Te{a*`"m:  
    HotKey[index]=0; Comu c  
    HotKeyMask[index]=0; i<T`]g  
    bRemoved=TRUE; eFx*lYjA  
    KeyCount--; k{;:KW|  
    break; 44]ae~@a  
   } zZy>XHR H  
  } M\]E;C'"U  
 } DnTM#i:  
 return bRemoved; [C&c;YNp  
} I/(`<s p  
[R~HhM  
ZWFH5#=  
  DLL中的钩子函数如下: J d`NS3;*p  
*"4ltWS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b_LzG_n!   
{ %GIla *  
 BOOL bProcessed=FALSE; N Lo>"<Xb  
 if(HC_ACTION==nCode) Z,2uN!6  
 {  Wi|.Z/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 CUtk4;^y#  
   switch(wParam) ?,!qh  
   {  O=mJ8W@  
    case VK_MENU: :r6 bw  
     MaskBits&=~ALTBIT; >,y QG+  
     break; 6D+9f{~r  
    case VK_CONTROL: t2E_y6  
     MaskBits&=~CTRLBIT; K>q,?x b  
     break; $@<\$I2s  
    case VK_SHIFT: U-Iwda8v  
     MaskBits&=~SHIFTBIT; D/)xe:  
     break; _Ih~'Y Fd  
    default: //judge the key and send message \ pq]q  
     break; i.#s'm.9  
   } IQ|~d08}  
   for(int index=0;index<MAX_KEY;index++){ HS2)vd@)  
    if(hCallWnd[index]==NULL) )oNomsn  
     continue; |GsLcUv6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qejzp/2  
    { yZ2,AR%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w?R6$n`  
     bProcessed=TRUE; 4f1*?HX&  
    } ZE1#{u~[y  
   } 2{%BQq>C  
  } 3sL#_@+yz  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~vt8|OOo0  
   switch(wParam) h?SUDk:2^  
   { -@QLE}~k[  
    case VK_MENU: ':fVb3A[*d  
     MaskBits|=ALTBIT;  [g/g(RL  
     break; H<q:+  
    case VK_CONTROL: > vahj,CZZ  
     MaskBits|=CTRLBIT; r"4:aKF>  
     break; AvwX 2?tc  
    case VK_SHIFT: T|=8 jt,  
     MaskBits|=SHIFTBIT; }b{N[  
     break; 1\3n   
    default: //judge the key and send message 1,/oS&?E  
     break; )i?wBxq'MA  
   } rzex"}/ly  
   for(int index=0;index<MAX_KEY;index++){ ?$gEX@5h  
    if(hCallWnd[index]==NULL) Axcm~ !uf  
     continue; i\3`?d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;\H2U .  
    { -W oZwqh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #\"5:.H Oz  
     bProcessed=TRUE; &^Xm4r%u_  
    } `fL$t0 "  
   } a]Lr<i8#%  
  } YlYTH_L>E  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )cvC9gt  
   for(int index=0;index<MAX_KEY;index++){ +Oxl1fDf  
    if(hCallWnd[index]==NULL) P3:hGmk8|j  
     continue; 1p tPey  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7y60-6r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); y)=Xo7j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \:Nbl<9(9  
   } [3\}Ca1  
  } ul:jn]S*  
 } m*(8I=]q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ed617J  
} HID;~Ne  
9iv!+(ni  
  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: i JQS@2=A  
:0]KIybt  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); , n+dB2\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Dl7#h,GTc<  
JU~l  
  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: F &uU ,);  
Va{`es)hky  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _kar5B$  
{ PB`94W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6.k2,C4dT<  
 { 9 Z4H5!:(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T%:}/@  
  SaveBmp(); YUc&X^O  
  return FALSE; qEywExdiu  
 } J0{0B=d;  
 …… //其它处理及默认处理 l.&6|   
} 0uj3kr?cv  
pV1~REk$&  
;8ugI  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 QYg2'`(  
x=9drKIw>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 B>JRta;hj  
f>Ij:b`Z2  
  二、编程步骤 X)'uTf0  
oo /#]a  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; aiz_6@Qfz*  
7q(RQQp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -`A6K!W&~p  
['{mW4i  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 0Pbv7)=XL  
2o6%P}C  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; _57i[U r  
}2G'3msx  
  5、 添加代码,编译运行程序。 ?*Jv&f#  
&,bJ]J)8O  
三、程序代码 !x&/M*nBE  
B1\}'g8%f  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Yz[^?M%(D  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) IY+P Yad  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +$ P0&YaQ  
#if _MSC_VER > 1000 hg |DpP  
#pragma once 2y,f  
#endif // _MSC_VER > 1000 yv&&x.!.Z  
#ifndef __AFXWIN_H__ rZ *}jD[  
#error include 'stdafx.h' before including this file for PCH !hEt UF  
#endif )$Mgp *?  
#include "resource.h" // main symbols Ia[e 7  
class CHookApp : public CWinApp <Azv VSA,  
{ MsfY|(/m  
 public: @/7tN3O  
  CHookApp(); eR =P  
  // Overrides Hh,q)(Wo  
  // ClassWizard generated virtual function overrides L%Me wU0TZ  
  //{{AFX_VIRTUAL(CHookApp) oS, %L  
 public: lor jMS  
  virtual BOOL InitInstance(); >DPC}@Wl  
  virtual int ExitInstance(); fgq#Oi}  
  //}}AFX_VIRTUAL L`tr7EEr  
  //{{AFX_MSG(CHookApp) [>v.#:YM^  
  // NOTE - the ClassWizard will add and remove member functions here. %r?Y!=0  
  // DO NOT EDIT what you see in these blocks of generated code ! 7]62=p2R  
  //}}AFX_MSG ]w"r4HlCx  
  DECLARE_MESSAGE_MAP() 0)+F}SyyD  
}; gm(`SC?a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3+0 $=ef  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R>yoMk/u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /n&w|b%  
BOOL InitHotkey(); G D$o |l]\  
BOOL UnInit(); up#W"`"  
#endif  GMrjZ  
B&VruOP0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jzo|$W  
#include "stdafx.h" (~#{{Ja  
#include "hook.h" t*iKkV^aE  
#include <windowsx.h> B!4chxzUZ  
#ifdef _DEBUG 9aHV~5  
#define new DEBUG_NEW g Q6_]~4  
#undef THIS_FILE V+(1U|@~  
static char THIS_FILE[] = __FILE__; !0i  
#endif "@#^/m)  
#define MAX_KEY 100 Rq|7$O5  
#define CTRLBIT 0x04 59 R;n.Q  
#define ALTBIT 0x02 !#Ub*qY1Z  
#define SHIFTBIT 0x01 i^f*Em1  
#pragma data_seg("shareddata") @ l41'?m  
HHOOK hHook =NULL; N8#wQ*MM>  
UINT nHookCount =0; tZB" (\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 'S;INs2|->  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  At @H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey eVGO6 2|!  
static int KeyCount =0; jb|al[p\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0Q`Dp;a5&  
#pragma data_seg() UP'~D]J  
HINSTANCE hins; jJml[iC  
void VerifyWindow(); V:s$V.{!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  ltK\ )L  
//{{AFX_MSG_MAP(CHookApp) 0}$Zr*|;Y  
// NOTE - the ClassWizard will add and remove mapping macros here. B<zoa=  
// DO NOT EDIT what you see in these blocks of generated code! C0(?f[/(M  
//}}AFX_MSG_MAP OX-t#R`  
END_MESSAGE_MAP() P{-j ^'y  
G)t_;iNL|  
CHookApp::CHookApp() g 0O~5.f  
{ F>RL&i  
 // TODO: add construction code here, piULIZ0  
 // Place all significant initialization in InitInstance n@[_lNa4GD  
} Se{x-vn?p  
_3~/Z{z8  
CHookApp theApp; qQ6rF nA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @G,pM: t  
{ ^hiIMqY_{`  
 BOOL bProcessed=FALSE; D~P3~^  
 if(HC_ACTION==nCode) hg4d]R,  
 { 1cq"H/N  
  if((lParam&0xc0000000)==0xc0000000){// Key up `1 A,sXfa  
   switch(wParam) Gj!9#on$7R  
   { C.4r`F$p  
    case VK_MENU: ]ie38tX$  
     MaskBits&=~ALTBIT; u a%@Ay1|  
     break; ,Pi!%an w  
    case VK_CONTROL: v]{F.N  
     MaskBits&=~CTRLBIT; ( f]@lNmx  
     break; Jui:Ms  
    case VK_SHIFT: }$%j}F{  
     MaskBits&=~SHIFTBIT; J'}G~rB<<  
     break; ~?#>QN\\c  
    default: //judge the key and send message F \0>/  
     break; n#$sLXVy  
   } 5ir Ffr  
   for(int index=0;index<MAX_KEY;index++){ OEi u,Y|@l  
    if(hCallWnd[index]==NULL) >f$N G  
     continue; zbY2gq@?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7XzhKA6  
    { 2i0 .x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3']a1\sy^  
     bProcessed=TRUE; <$z6:4uN_  
    } W>#[a %R  
   } 0{Uc/  
  } Eqizx~eqq  
  else if((lParam&0xc000ffff)==1){ //Key down  m#K)%0  
   switch(wParam) }Wlm#t  
   { L h@0|k  
    case VK_MENU: = -bGH   
     MaskBits|=ALTBIT; )_C+\K*  
     break; qTZ\;[CrP"  
    case VK_CONTROL: amTeT o]Tg  
     MaskBits|=CTRLBIT; ml,FBBGq|-  
     break; u}r>?/V!  
    case VK_SHIFT: ]y0bgKTK  
     MaskBits|=SHIFTBIT; epN!+(v  
     break; JkShtLEr  
    default: //judge the key and send message \<ko)I#%  
     break; p~'iK4[&6  
   } VdL*"i  
   for(int index=0;index<MAX_KEY;index++) ~ECIL7,  
   { pl }nb Y  
    if(hCallWnd[index]==NULL) C]EkVcKFA  
     continue; o|kiwr}Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {'8td^JEE  
    { -.@dA'j[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /PZx['g  
     bProcessed=TRUE;  Zh  
    } Iip%er%b  
   } dl]pdg<  
  } 5bB\i79$  
  if(!bProcessed){ &x9>8~   
   for(int index=0;index<MAX_KEY;index++){ &2,3R}B/  
    if(hCallWnd[index]==NULL) .}9Lj  
     continue; ^r=Wj@`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @>fsg-|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TUBpRABH  
   } {=%,NwPs  
  } aP$it 6Z  
 } TTa$wiW7'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HKL/ D  
} !F:ANoaS  
vX@T Zet0  
BOOL InitHotkey() H@xHkqan  
{ #My14u  
 if(hHook!=NULL){ K'Y/0:"*  
  nHookCount++; Uiv4'v Yg  
  return TRUE; u{-@,-{  
 } q4#$ca[_ak  
 else ))%f"=:wt  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U)[LKO1  
  if(hHook!=NULL) C: AD ZJL  
   nHookCount++; A` ~R\j  
  return (hHook!=NULL); i/ .#`  
} $d-$dM?R5  
BOOL UnInit() 4^Ss\$*  
{ w/z o  
 if(nHookCount>1){ (_%l[:o6  
  nHookCount--; s\zY^(v4  
  return TRUE; "XQ3mi`y  
 } =Vm3f^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5e3p9K`5  
 if(unhooked==TRUE){ gvFJ~lL  
  nHookCount=0; z:a7)z  
  hHook=NULL; =2t=Zyp0Y  
 } Kf-XL ),3l  
 return unhooked; G} f9:G  
} O3V.4tp  
tQ *?L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~GE|,Np  
{ F EUfskv  
 BOOL bAdded=FALSE; AGl#f\_^  
 for(int index=0;index<MAX_KEY;index++){ /X]gm\x7s  
  if(hCallWnd[index]==0){ uO>x"D5tZ:  
   hCallWnd[index]=hWnd; 7Ll? #eun  
   HotKey[index]=cKey; Q45gC28x  
   HotKeyMask[index]=cMask; 9Af nMD  
   bAdded=TRUE; K?nQsT;3p  
   KeyCount++; J&Db-  
   break; ?)ct@,Ek$  
  } .i {yW  
 } 2TG2<wqvE  
 return bAdded; 1M.#7;#B3  
} 2$o#b .  
&q&~&j'[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $Zr \$z2  
{ &pQ[(|=(  
 BOOL bRemoved=FALSE; h3bQ<?m  
 for(int index=0;index<MAX_KEY;index++){ ?0'e_s  
  if(hCallWnd[index]==hWnd){ *LMzq9n3o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =0L%<@yA  
    hCallWnd[index]=NULL; `YUeVz>q?  
    HotKey[index]=0; *8Su:=*b  
    HotKeyMask[index]=0; &zd@cr1  
    bRemoved=TRUE; [p' A?-  
    KeyCount--; 7;c^*"Ud  
    break; a"i(.(9$J  
   } 9@ 4]t6h[  
  } x+DETRLP  
 } ;GE6S{~-  
 return bRemoved; !?R#e`}  
} k`o8(zPb  
:_<&LO]Q  
void VerifyWindow() H | C3{9  
{ 3dz{" hV  
 for(int i=0;i<MAX_KEY;i++){ A;5_/ 2  
  if(hCallWnd!=NULL){ H s$HeAp;  
   if(!IsWindow(hCallWnd)){ n*ROlCxV  
    hCallWnd=NULL; HE{UgU:tY  
    HotKey=0; E,F^!4 rJ$  
    HotKeyMask=0; Rp;"]Q&b  
    KeyCount--; "@5qjLz]  
   } _k : BY  
  } '4 It>50b  
 } ePZ Ai"k  
} 'gXD?ARW  
]&;In,z  
BOOL CHookApp::InitInstance() Yn$: |$  
{ JB%_&gX)v  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); MLlvsa0  
 hins=AfxGetInstanceHandle(); V FM!K$_  
 InitHotkey(); |Eh2#K0x4G  
 return CWinApp::InitInstance(); CzY18-L@EX  
} !VaC=I^{  
}z#M!~  
int CHookApp::ExitInstance() Q>$lf.)  
{ 1ni72iz\  
 VerifyWindow(); FA>.1EI  
 UnInit(); n&o"RE 0~0  
 return CWinApp::ExitInstance(); t*; KxQ+'?  
} am !ssF5s  
2D:,(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H)h^|A/vO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7x77s  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `\|@w@f|;  
#if _MSC_VER > 1000 Nmd{C(^o  
#pragma once St(jrZb  
#endif // _MSC_VER > 1000 $&qLr KJ  
 *  ]  
class CCaptureDlg : public CDialog r\#nBoo(  
{ k q]E@tE*3  
 // Construction {]U \HE1w  
 public: [3sZ=)G  
  BOOL bTray; E<}sGzMc  
  BOOL bRegistered; ev0>j4Q  
  BOOL RegisterHotkey(); ~(^pGL3<  
  UCHAR cKey; 6;\1bP?  
  UCHAR cMask;  0Gc:+c7{  
  void DeleteIcon(); YM#MfL#  
  void AddIcon(); wfe4b  
  UINT nCount; w N`Nj m9!  
  void SaveBmp(); FfxD=\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r~JGs?GH  
  // Dialog Data )t3`O$J  
  //{{AFX_DATA(CCaptureDlg) C-)d@LWI  
  enum { IDD = IDD_CAPTURE_DIALOG }; PH&Qw2(Sx  
  CComboBox m_Key; tl{{Vc[  
  BOOL m_bControl; >itNa.K  
  BOOL m_bAlt; ;~L,Aqn7  
  BOOL m_bShift; 5073Q~  
  CString m_Path; 7.Z-  
  CString m_Number; h)fsLzn]Tf  
  //}}AFX_DATA x#&_/oqAk  
  // ClassWizard generated virtual function overrides jjQDw=6  
  //{{AFX_VIRTUAL(CCaptureDlg) z. X hE \  
 public: M9o/6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X`EVjK  
 protected: bcvm]aPu  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ^|zag  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qy.$5-e:[9  
  //}}AFX_VIRTUAL UCjx   
  // Implementation JIw?]xa*  
 protected: MRXw)NAw  
  HICON m_hIcon; yGNpx3H  
  // Generated message map functions ^n<YO=|u  
  //{{AFX_MSG(CCaptureDlg) U^|T{g+O  
  virtual BOOL OnInitDialog(); U}DE9e{/!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %FM26^  
  afx_msg void OnPaint(); ab2Cn|F  
  afx_msg HCURSOR OnQueryDragIcon(); -BI!ZsC'  
  virtual void OnCancel(); G u_\ySV/y  
  afx_msg void OnAbout(); &*'^uCna  
  afx_msg void OnBrowse(); Fbu4GRgJ3  
  afx_msg void OnChange(); Mh2b!B  
 //}}AFX_MSG =H8FV09x}  
 DECLARE_MESSAGE_MAP() hu} vYA7ZH  
}; :j .:t  
#endif tY]?2u%)  
;+(_stxqV9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file DZ\ '7%c  
#include "stdafx.h" wu eDedz\  
#include "Capture.h" n{<}<SVY  
#include "CaptureDlg.h" 5,oLl {S'  
#include <windowsx.h> A?lR[`'u\  
#pragma comment(lib,"hook.lib") 3M+rFB}tS  
#ifdef _DEBUG 4)OOj14-V  
#define new DEBUG_NEW !wQ?+ :6  
#undef THIS_FILE Al6%RFt  
static char THIS_FILE[] = __FILE__; 3u[8;1}7Q  
#endif mjg@c|rTG  
#define IDM_SHELL WM_USER+1 ]UEA"^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %qo.n v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J^CAQfcx  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; eR>8V8@  
class CAboutDlg : public CDialog %AtT(G(n  
{ L7aVj&xM  
 public: s@iY'11  
  CAboutDlg(); o6;  
  // Dialog Data Z2yO /$<  
  //{{AFX_DATA(CAboutDlg) +>1?ck  
  enum { IDD = IDD_ABOUTBOX }; t3?I4HQ  
  //}}AFX_DATA #9r}Kr=P  
  // ClassWizard generated virtual function overrides 2)}*'_E9  
  //{{AFX_VIRTUAL(CAboutDlg) zSD_t  
 protected: %{4 U\4d@'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F(."nUrf  
  //}}AFX_VIRTUAL _0gdt4  
  // Implementation ,g}$u'A+d  
 protected: "= %"@"<)  
  //{{AFX_MSG(CAboutDlg) jUNt4  
  //}}AFX_MSG ](Wa:U}Xs  
  DECLARE_MESSAGE_MAP() l3ogMRq@  
}; Kw;gQk~R!  
"0Z /|&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =y@0i l+V  
{ $\vNST E  
 //{{AFX_DATA_INIT(CAboutDlg) x:~XZX\mwH  
 //}}AFX_DATA_INIT Rvu5#_P  
} %Rf9 KQ  
=^rp= Az  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $V`1<>4  
{ csLbzDg  
 CDialog::DoDataExchange(pDX); 1Dc6v57  
 //{{AFX_DATA_MAP(CAboutDlg) KMkD6g  
 //}}AFX_DATA_MAP d9U)O6=  
} kZF<~U  
CUG"2K9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +%,oq ]<[,  
 //{{AFX_MSG_MAP(CAboutDlg) F1_,V?  
 // No message handlers )P b$  
 //}}AFX_MSG_MAP h9im S\gfr  
END_MESSAGE_MAP() W!\%v"  
kiN,N]-V  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Spx%`O<  
: CDialog(CCaptureDlg::IDD, pParent) j7Y7&x"  
{ v!ai_d^  
 //{{AFX_DATA_INIT(CCaptureDlg) fU ;H  
  m_bControl = FALSE; % JiF269  
  m_bAlt = FALSE; CP; <B1  
  m_bShift = FALSE; WHv6E!^\_  
  m_Path = _T("c:\\"); @{fwM;me]P  
  m_Number = _T("0 picture captured."); oz.z>+Q  
  nCount=0; bcy  
  bRegistered=FALSE; j2IK\~W?-  
  bTray=FALSE; BI-'&kPk  
 //}}AFX_DATA_INIT o[ks-C>jw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 y7!&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); K n1;=k  
} L)\<7  
'Z.C&6_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Zqe$S +u  
{ f1'X<VA  
 CDialog::DoDataExchange(pDX); C@:X9NU  
 //{{AFX_DATA_MAP(CCaptureDlg) F."ZCEb  
  DDX_Control(pDX, IDC_KEY, m_Key); e4Qjx*[G  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); PPySOkmS3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); T6\]*mlr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _6c/,a8;*J  
  DDX_Text(pDX, IDC_PATH, m_Path); B@ufrQ#Y.  
  DDX_Text(pDX, IDC_NUMBER, m_Number); z a_0-G%C2  
 //}}AFX_DATA_MAP Tq )hAZ  
} \}.bTca  
j} /).O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `W+-0F@Y?@  
//{{AFX_MSG_MAP(CCaptureDlg) bfncO[Q,?  
 ON_WM_SYSCOMMAND() j5:4/vD  
 ON_WM_PAINT() ~F,Y BX  
 ON_WM_QUERYDRAGICON() d`flYNg4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) TW(X#T@Z6I  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) { ?jXPf  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ]R}(CaT1  
//}}AFX_MSG_MAP 4[kyzz x  
END_MESSAGE_MAP() N;-%:nC  
BxV>s+o&]  
BOOL CCaptureDlg::OnInitDialog() u ynudO  
{ n CX{tqy   
 CDialog::OnInitDialog(); p9 ,[kb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5RWqHPw+  
 ASSERT(IDM_ABOUTBOX < 0xF000); cH5  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fB7Jx6   
 if (pSysMenu != NULL) MS#*3Md&y  
 { nu1XT 1q1  
  CString strAboutMenu; Xr8fmJtg'  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3J 5,V  
  if (!strAboutMenu.IsEmpty()) S},Cz  
  { hG#2}K_  
   pSysMenu->AppendMenu(MF_SEPARATOR); >\:GFD{z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xq,ql@7  
  } rA?< \*  
 } ]v>[r?X#V  
 SetIcon(m_hIcon, TRUE); // Set big icon 6qTMHRI  
 SetIcon(m_hIcon, FALSE); // Set small icon <+ [N*  
 m_Key.SetCurSel(0); =$y J66e  
 RegisterHotkey(); )nj fqg  
 CMenu* pMenu=GetSystemMenu(FALSE); Q=DMfJ"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); rf@47H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S~fP$L5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m(9I+`  
 return TRUE; // return TRUE unless you set the focus to a control D{\o*\TN  
} |X XO0  
}xBO;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zd$?2y8  
{ Hu6Qr  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) . IY@Q  
 { ey9hrRMR  
  CAboutDlg dlgAbout; mP6}$ D  
  dlgAbout.DoModal(); 5+oY c-  
 } (91ts$jH  
 else .nVY" C&  
 { c*zeO@AAn  
  CDialog::OnSysCommand(nID, lParam); 4t%Lo2v!X%  
 } K2n#;fY %  
} DQ/rx`BG  
u$5.GmKm  
void CCaptureDlg::OnPaint() 8Ara^Xh}q  
{ pYAKA1F  
 if (IsIconic()) K$}K2w  
 { $?z} yx$  
  CPaintDC dc(this); // device context for painting +'93%/:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YG= :lf  
  // Center icon in client rectangle ZWS:-]P.  
  int cxIcon = GetSystemMetrics(SM_CXICON); - uO(qUa#  
  int cyIcon = GetSystemMetrics(SM_CYICON); *6AqRE  
  CRect rect; 45[,LJaMd  
  GetClientRect(&rect); <Dgf'Gr J  
  int x = (rect.Width() - cxIcon + 1) / 2; gq*W 0S  
  int y = (rect.Height() - cyIcon + 1) / 2; T@P~A)>yo  
  // Draw the icon )OFN0'  
  dc.DrawIcon(x, y, m_hIcon); : 4-pnn  
 } Dmy=_j?ej  
 else :~W(#T,$E  
 { [9 :9<#?o^  
  CDialog::OnPaint(); ju;OQC~[L]  
 } XI$W  
} f9Xa}*  
[X]hb7-&  
HCURSOR CCaptureDlg::OnQueryDragIcon() wxJ"{(;  
{ [hH>BEtm  
 return (HCURSOR) m_hIcon; $gYGnh_,Q  
} kxyOe[7 S  
8q6Le{G  
void CCaptureDlg::OnCancel() bxL'k/Y$  
{ q^^R|X1  
 if(bTray) m;xa}b{(i  
  DeleteIcon(); v)|a}5={  
  CDialog::OnCancel(); xfX|AC  
} T1Z*>(M  
 Glx{Zu=  
void CCaptureDlg::OnAbout() 6?.S-.Mr  
{ Y^d#8^cP  
 CAboutDlg dlg; +.^pAz U}R  
 dlg.DoModal(); $}S0LZ_H  
} e8:O2!HW  
@44*<!da  
void CCaptureDlg::OnBrowse() jG& 8`*|*  
{ :iE`=( o  
 CString str; T 8 ]*bw  
 BROWSEINFO bi; kt_O=  
 char name[MAX_PATH]; ! ,H6.IH;S  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nI(w7qhub  
 bi.hwndOwner=GetSafeHwnd(); "^{Hta  
 bi.pszDisplayName=name; >Q"3dw  
 bi.lpszTitle="Select folder"; wfu`(4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =I&BO[d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); g%^/^<ei  
 if(idl==NULL) NgsEEPu?  
  return; ,SdxIhL  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); *'M+oi  
 str.ReleaseBuffer(); zd$iD i($  
 m_Path=str; In:V.'D/>t  
 if(str.GetAt(str.GetLength()-1)!='\\') 0%HAa|L,,  
  m_Path+="\\"; KC9VQeSc  
 UpdateData(FALSE); Wq1OYZ,  
} ~@<o-|#  
d0%Wz5Np  
void CCaptureDlg::SaveBmp() 4~oRcO8!Y  
{ =1!.g"0  
 CDC dc; wM;=^br  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {A ,w%  
 CBitmap bm; -cn`D2RP  
 int Width=GetSystemMetrics(SM_CXSCREEN); {H9g&pfv  
 int Height=GetSystemMetrics(SM_CYSCREEN); '?NMQ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); , .=7{y~  
 CDC tdc; 2p 7;v7)y  
 tdc.CreateCompatibleDC(&dc); f` -vnh^+  
 CBitmap*pOld=tdc.SelectObject(&bm); t(.vX  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l`X?C~JhJ  
 tdc.SelectObject(pOld); r~,3  
 BITMAP btm; 9]G~i`QQ  
 bm.GetBitmap(&btm); vGJw/ij'X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; vt(}8C+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XS&;8 PO  
 BITMAPINFOHEADER bih; 9 MQwc  
 bih.biBitCount=btm.bmBitsPixel; |KPNl\%ID  
 bih.biClrImportant=0; /Gb)BJk!  
 bih.biClrUsed=0; }LEasj  
 bih.biCompression=0; Lew 2Z  
 bih.biHeight=btm.bmHeight; 7N vRZ!  
 bih.biPlanes=1; |VyN>&r~6  
 bih.biSize=sizeof(BITMAPINFOHEADER); B'vIL'  
 bih.biSizeImage=size; kxAT  
 bih.biWidth=btm.bmWidth; U =g&c `  
 bih.biXPelsPerMeter=0; 0d~?|Nv -  
 bih.biYPelsPerMeter=0; /a-s9<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3a U4Z|f~  
 static int filecount=0; wA,-!m  
 CString name; &g*1If  
 name.Format("pict%04d.bmp",filecount++); @l_rB~  
 name=m_Path+name; c5Kc iTD^  
 BITMAPFILEHEADER bfh; w'xPKO$bzR  
 bfh.bfReserved1=bfh.bfReserved2=0; 1guiuR4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]D2 d=\  
 bfh.bfSize=54+size; fv* $=m  
 bfh.bfOffBits=54; p>T  
 CFile bf; |x _jpR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *9F{+)A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); awQB0ow'$P  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 28}L.>5k  
  bf.WriteHuge(lpData,size); 8yZs>Og?  
  bf.Close(); L1@<7?@X  
  nCount++; j&8G tE1b  
 } -B7X;{  
 GlobalFreePtr(lpData); brqmi<*9"[  
 if(nCount==1) 6HVX4Z#VH  
  m_Number.Format("%d picture captured.",nCount); 4~nf~  
 else gKWUHlQY  
  m_Number.Format("%d pictures captured.",nCount); =|^R<#%/  
  UpdateData(FALSE); ~Hx>yn94e  
} KYg'=({x  
Kj4L PG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Yfz`or\@=  
{ i~4$V  
 if(pMsg -> message == WM_KEYDOWN) (ze9-!%  
 { K)n058PO  
  if(pMsg -> wParam == VK_ESCAPE) Ogh,  
   return TRUE; \K Kt& bKL  
  if(pMsg -> wParam == VK_RETURN) bNvc@oo  
   return TRUE; v//Drj  
 } `'bu8JK  
 return CDialog::PreTranslateMessage(pMsg); 1u }2}c|  
} uXG$YDKqC  
|F ~U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "p>kiNu  
{ Te^_gdf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Je K0><  
  SaveBmp(); 8ux  
  return FALSE; rZ RTQ  
} 7 3ABop  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ m^tf=O<  
 CMenu pop; %~lTQCPE  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zmFKd5  
 CMenu*pMenu=pop.GetSubMenu(0); ^'b\OUty-  
 pMenu->SetDefaultItem(ID_EXITICON); g- INhzMu  
 CPoint pt; 7Mh!@Rd_V  
 GetCursorPos(&pt); ]0}NF  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |B\76Nk  
 if(id==ID_EXITICON) {q);1Nnf  
  DeleteIcon(); {Sc*AE&Y  
 else if(id==ID_EXIT) .SWn/Kk  
  OnCancel(); OZ<fQf.Gh}  
 return FALSE; B/JMH 1r  
} MBol_#H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Fj&8wZ)v)  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ).MV1@s  
 AddIcon(); %w3tzE1Hq  
 return res; 7U&<{U<  
} `]/0&S  
q-+_Y `_\  
void CCaptureDlg::AddIcon() j 4(f1  
{ VY!A]S"  
 NOTIFYICONDATA data; _Vt CC/  
 data.cbSize=sizeof(NOTIFYICONDATA); ^/$U(4  
 CString tip; 2(9~G|C.  
 tip.LoadString(IDS_ICONTIP); ?y[i6yN9  
 data.hIcon=GetIcon(0); 4(8BWP~.y2  
 data.hWnd=GetSafeHwnd(); O<?.iF%  
 strcpy(data.szTip,tip); 7VfPS5se  
 data.uCallbackMessage=IDM_SHELL; U\"FYTC  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =MmAnjo  
 data.uID=98; jhka;m  
 Shell_NotifyIcon(NIM_ADD,&data); FaG&U  
 ShowWindow(SW_HIDE); srS5-fs  
 bTray=TRUE; FeZGPxc~  
} gJOD+~  
9*[!ux7h  
void CCaptureDlg::DeleteIcon() |7miT!y8  
{ z) "(&__  
 NOTIFYICONDATA data; ~ =$d>ZNQ  
 data.cbSize=sizeof(NOTIFYICONDATA); c 1{nOx  
 data.hWnd=GetSafeHwnd(); #b;TjnC5{$  
 data.uID=98; 19\ V@d^  
 Shell_NotifyIcon(NIM_DELETE,&data); i6:O9Km  
 ShowWindow(SW_SHOW); t8~isuiK  
 SetForegroundWindow(); 2t#[$2mg\0  
 ShowWindow(SW_SHOWNORMAL); 6lQP+! EF  
 bTray=FALSE; RJD(c#r$  
} 6eK7Jv\K  
m P./e8  
void CCaptureDlg::OnChange() m*>gG{3;  
{ }FkF1?C  
 RegisterHotkey(); :-T[)Q+-3  
} +,4u1`c|$  
nS^,Sq\Ak  
BOOL CCaptureDlg::RegisterHotkey() QM=Y}   
{ '#612iZo  
 UpdateData(); A+"'8%o9}  
 UCHAR mask=0; Es1T{<G|w  
 UCHAR key=0; *HQ>tvUh  
 if(m_bControl) FMqes5\ 3  
  mask|=4; \~>7n'd ]  
 if(m_bAlt) R9~c: A4G  
  mask|=2; f"G-',O<  
 if(m_bShift) j<d,7  
  mask|=1; p $,ZYF~  
  key=Key_Table[m_Key.GetCurSel()]; f;3k Yh^4  
 if(bRegistered){ kSjvY&n%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); B[7Fq[.mh  
  bRegistered=FALSE; aydf# [F  
 } *#o2b-[V  
 cMask=mask;  0gJ{fcI  
 cKey=key; ua%j}%G(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |k/;1.b!9(  
 return bRegistered; -^$IjK-N  
} sbq:8P#  
?#/~ BZR!  
  四、小结 O _^Y*!  
I=4G+h5p  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八