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
  • 5988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: )+|Y;zC9  
  2'u%  
  一、实现方法 fZrh_^yH  
LGK@taw^  
  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: |-L7qZu%  
^h^.;Iqr=  
#pragma data_seg("shareddata") in6*3C4  
HHOOK hHook =NULL; //钩子句柄 (e Ssx/  
UINT nHookCount =0; //挂接的程序数目 ")<5 VtV  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /36gf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %j.n^7i]^:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I-#7Oq:Np  
static int KeyCount =0; )D ~ 5  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >wb Uxl%{5  
#pragma data_seg() b0Dco0U(  
RFoCM^  
  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。  ?tA%A  
f-p$4%(  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: -iKoQkHt  
_ s*p$/V\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .><-XJ  
cKey,UCHAR cMask) -Aojk8tc  
{ Y&H<8ez  
 BOOL bAdded=FALSE; +lb&_eD  
 for(int index=0;index<MAX_KEY;index++){ nW}jTBu_K+  
  if(hCallWnd[index]==0){ i%[+C  
   hCallWnd[index]=hWnd; [+Fajo;0  
   HotKey[index]=cKey; a~ dgf:e`  
   HotKeyMask[index]=cMask; !o1IpTN  
   bAdded=TRUE; 83 <CDjD  
   KeyCount++; HQ]mDo  
   break; )Xa_ry7  
  } 05g %5vHF  
 } ]|tR8`DGZ%  
 return bAdded; 5z =}o/?  
} I]hjv  
//删除热键 H]7bqr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sO}CXItC+j  
{ KA{&NFx  
 BOOL bRemoved=FALSE; *<X1M~p$  
 for(int index=0;index<MAX_KEY;index++){ ',K:.$My  
  if(hCallWnd[index]==hWnd){ i I`vu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rVP{ ^Jdo  
    hCallWnd[index]=NULL; 'v9M``  
    HotKey[index]=0; zw+RDo  
    HotKeyMask[index]=0; at4JLbk  
    bRemoved=TRUE; D,Gv nfY  
    KeyCount--; h3-^RE5\`S  
    break; b.v +5=)B  
   } OF03]2j7<|  
  } }xBDyr63  
 } S~)`{ \  
 return bRemoved; 6VVxpDAi:  
} mPHto-=fB  
c@Br_ -  
qYJ<I'Ux O  
  DLL中的钩子函数如下: +Gg|BTTL/  
~_Fx2T:X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _VVq&t}  
{ _",< at  
 BOOL bProcessed=FALSE; 6<T:B[a-  
 if(HC_ACTION==nCode) Il Qk W<  
 { ;S \s&.u  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /_})7I52  
   switch(wParam) 0KTO )K  
   {  j#~~_VA~  
    case VK_MENU: /Ry% K4$  
     MaskBits&=~ALTBIT; ]E$NJq|  
     break; v bn=ywz  
    case VK_CONTROL: kDDC@A $  
     MaskBits&=~CTRLBIT; W=3#oX.GsU  
     break; #4./>}G  
    case VK_SHIFT: ^lt2,x   
     MaskBits&=~SHIFTBIT; ZE-vroh  
     break; A]TEs)#*7)  
    default: //judge the key and send message  V?1[R  
     break; =yz"xWH  
   } fge h;cD  
   for(int index=0;index<MAX_KEY;index++){ ti (Hx  
    if(hCallWnd[index]==NULL) 57EX#:a  
     continue; w%s];EE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :L@n(bu RN  
    { s .<.6t:G4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '(rD8 pc  
     bProcessed=TRUE; r{^43g?  
    } CgmAxcK  
   } a6j& po  
  } b>VV/j4!/  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^3BPOK[*gB  
   switch(wParam) i%[gNh  
   { *asv^aFpS  
    case VK_MENU: ,dR.Sac v  
     MaskBits|=ALTBIT; z=) m6\  
     break; V:'F_/&X?  
    case VK_CONTROL: q)L4*O  
     MaskBits|=CTRLBIT; *Z^`H!&  
     break; A&)2m  
    case VK_SHIFT: }oA>0Nw$K  
     MaskBits|=SHIFTBIT; )WbWp4  
     break; KILX?Pt[7  
    default: //judge the key and send message U 7.kYu  
     break; eG1V:%3  
   } `WN80d\)&  
   for(int index=0;index<MAX_KEY;index++){ >5#}/G&  
    if(hCallWnd[index]==NULL) NLY=o@<  
     continue; Lc5zu7ncg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &Ap9h# dK  
    { Vy I\Jmr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bsDA&~)s  
     bProcessed=TRUE; 38D5vT)n  
    } E I(e3  
   } w~)tEN>  
  } )xccs'H  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 JJ7A` ;  
   for(int index=0;index<MAX_KEY;index++){ \ c4jGJ  
    if(hCallWnd[index]==NULL) Q5T3  
     continue; d\nXK#)Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^;<d<V}*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QMz=e  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c0'ryS_Z9  
   } D<d, 9S,)  
  } 8 5X}CCQ  
 } 4r7F8*z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rAfz?  
} babL.Ua8o  
OyVP_Yx,V  
  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: 9Z!n!o7D  
F0p=|W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X':FFD4h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6T'UWh0S  
=DJ:LmK  
  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: EN\cwa#FU  
,\iHgsZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0(wu  
{ (Fon!_$:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~q}L13^k  
 { (g@\QdH`|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !i~(h&z  
  SaveBmp(); *lvADW5e  
  return FALSE; cVW7I  
 } BYXc 'K  
 …… //其它处理及默认处理 :vb5J33U  
} }W8A1-UF  
B6 (\1  
0>Snps3*Z  
  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。 .)b<cH~%  
<`uu e  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 [oV M9 Q  
Pd~=:4  
  二、编程步骤 2$5">%?  
+FqD.=8  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]"Uzn  
XLt/$Caf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; qisvGHo  
AJ7^'p9Y  
  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; xyL)'C  
B#S8j18M  
  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; 0fXMY-$I  
NUYKMo1ze  
  5、 添加代码,编译运行程序。 G-T^1?  
* ) <+u~  
三、程序代码 8F8?1  
S[3"?$3S  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,~naKd.ZY  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e9{0hw7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dgpE3 37Lt  
#if _MSC_VER > 1000 "jum*<QZz  
#pragma once PiKP.  
#endif // _MSC_VER > 1000 o@zxzZWg  
#ifndef __AFXWIN_H__ 6]b"n'G  
#error include 'stdafx.h' before including this file for PCH aNEah  
#endif uKP4ur@1  
#include "resource.h" // main symbols FSA%,b; U  
class CHookApp : public CWinApp y<Q"]H.CkQ  
{ uVn"L:_  
 public: ce\d35x!  
  CHookApp(); RH;ulAD6(~  
  // Overrides Dhn7N8(LF!  
  // ClassWizard generated virtual function overrides nUP, Yd  
  //{{AFX_VIRTUAL(CHookApp) b!@PS$BTxq  
 public: ^7spXfSAd  
  virtual BOOL InitInstance(); HXa[0VOx  
  virtual int ExitInstance(); 7x6 M]1F  
  //}}AFX_VIRTUAL X>[i<ei  
  //{{AFX_MSG(CHookApp) (0NffM1  
  // NOTE - the ClassWizard will add and remove member functions here. mp8GHV  
  // DO NOT EDIT what you see in these blocks of generated code ! "5V;~}=S  
  //}}AFX_MSG 60!%^O =  
  DECLARE_MESSAGE_MAP() _eiqs  
}; 6/8K2_UeoW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (NvjX})eh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PK2;Ywk`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6h>#;M  
BOOL InitHotkey(); 5U~KYy^v  
BOOL UnInit(); hi[nUG(OI  
#endif '|SO7}`;Q  
+-@n}xb@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. =Pl@+RgK+  
#include "stdafx.h" 2nkA%^tR  
#include "hook.h" =8T!ldVxES  
#include <windowsx.h> nv:Qd\UM  
#ifdef _DEBUG v]V N'Hs?  
#define new DEBUG_NEW k\#;  
#undef THIS_FILE cpjwc@UMe  
static char THIS_FILE[] = __FILE__; H:c5 q0O^x  
#endif 9i5?J]o^  
#define MAX_KEY 100 UUV5uDe>i  
#define CTRLBIT 0x04 F<I*?${[  
#define ALTBIT 0x02 ;98&5X\u<  
#define SHIFTBIT 0x01 Xk4wU$1F  
#pragma data_seg("shareddata") l)[|wPf  
HHOOK hHook =NULL; tS2 &S 6u  
UINT nHookCount =0; (kLaXayn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {Ge{@1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT UN.;w3`Oc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey py'vD3Q  
static int KeyCount =0; <==uK>pET  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift g3$'G hf  
#pragma data_seg() j hm3:;Z  
HINSTANCE hins; z{L'7  
void VerifyWindow(); "#O9ij  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %b^4XTz  
//{{AFX_MSG_MAP(CHookApp) 6j|Ncv  
// NOTE - the ClassWizard will add and remove mapping macros here. !XtG6ON=  
// DO NOT EDIT what you see in these blocks of generated code! rC-E+%y  
//}}AFX_MSG_MAP 3}H{4]*%_  
END_MESSAGE_MAP() ^+P.f[  
MIZdk'.U  
CHookApp::CHookApp() |!PL"]?  
{ eC!=4_lx)  
 // TODO: add construction code here, oK\zyNK  
 // Place all significant initialization in InitInstance G+<XYkz*  
} 0zH-g  
B r#{  
CHookApp theApp; F$a s#.7FF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yI: ;+K  
{ x2B8G;6u  
 BOOL bProcessed=FALSE; DJ"PP 5d  
 if(HC_ACTION==nCode) ,m#  
 { 3lp'U&3`5  
  if((lParam&0xc0000000)==0xc0000000){// Key up Lm4`O %  
   switch(wParam) J>A9]%M  
   {  +|LM"  
    case VK_MENU: 5C!zEI)  
     MaskBits&=~ALTBIT; }%u #TwZ  
     break; r ]7: ?ir  
    case VK_CONTROL: X9Ch(nWX  
     MaskBits&=~CTRLBIT; O^MI073Q>t  
     break; \t!~s^Oox  
    case VK_SHIFT: vS8& ,wJ!  
     MaskBits&=~SHIFTBIT; 7%  D4  
     break; &gp&i?%X9b  
    default: //judge the key and send message i{6&/TBnr  
     break; N\PdX$  
   } Ur])*#  
   for(int index=0;index<MAX_KEY;index++){ b{<?E };%  
    if(hCallWnd[index]==NULL) YCDH0M  
     continue; SI!A?34  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |P>7C  
    { # sw4)*v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); T<B}Z11R  
     bProcessed=TRUE; 4QA~@pBX^{  
    } a.V5fl0?I@  
   } s/7Z.\  
  } *tUOTA 3L  
  else if((lParam&0xc000ffff)==1){ //Key down J#$U<`j*G  
   switch(wParam) ^bv^&V&IB  
   { 3jAr"xc  
    case VK_MENU: O t)}:oG  
     MaskBits|=ALTBIT; &4:R(]|  
     break; =cEsv&i  
    case VK_CONTROL: 3mHzOs\jU  
     MaskBits|=CTRLBIT; }b\hRy~=r  
     break; }nlS&gew^  
    case VK_SHIFT: =Dq&lm,n  
     MaskBits|=SHIFTBIT; _qa]T'8  
     break; T [SK>z  
    default: //judge the key and send message )$!b`u  
     break; *S}@DoXS  
   } $Lp [i <O]  
   for(int index=0;index<MAX_KEY;index++) WutPy_L<  
   { 6nL^"3@S!  
    if(hCallWnd[index]==NULL) FoetP`   
     continue; 01'>[h#_n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MDlH[PJ@i  
    { ]CzK{-W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u#Ig!7iUu  
     bProcessed=TRUE; zr|DC] 3  
    } PLkS-B  
   }  8oJl ]  
  } [#Qf#T%5h  
  if(!bProcessed){ uN)c!='I  
   for(int index=0;index<MAX_KEY;index++){ o-rX4=T  
    if(hCallWnd[index]==NULL) M{L- V  
     continue; iAz0 A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  i"<W6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (\F9_y,6*\  
   } VW\S>=O99  
  } b$b;^nly  
 } bA)nWWSg=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [OCjYC`  
} e{E\YEc  
2fTuIS<yr  
BOOL InitHotkey() osXEzr(  
{ Vkg0C*L_  
 if(hHook!=NULL){ X]=eC6M}:V  
  nHookCount++; GTR*3,rw  
  return TRUE; d^=)n-!T  
 } tu}!:5xi  
 else xE 8?%N U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "K(cDVQ  
  if(hHook!=NULL) ^s{Ff+]W  
   nHookCount++; 0#WN2f, <:  
  return (hHook!=NULL); ?b+Y])SJK  
} 4:/V|E\D  
BOOL UnInit() y^C5_w(^jZ  
{ h^ Cm\V  
 if(nHookCount>1){ D3 C7f'  
  nHookCount--; fQ5v?(  
  return TRUE; rn|]-^ku/  
 } fB+h( 2N~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -~]H5er`  
 if(unhooked==TRUE){ 6bPxEILm  
  nHookCount=0; UDJjw  
  hHook=NULL; S($/Ov  
 } @%,~5{Ir  
 return unhooked; Fl_}Auj{&(  
} fn,n'E]  
\x-2qlZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1%v6d !  
{ |<u+Xi ~  
 BOOL bAdded=FALSE; cANt7  
 for(int index=0;index<MAX_KEY;index++){ cTq@"v di  
  if(hCallWnd[index]==0){ or*{P=m+R  
   hCallWnd[index]=hWnd; gHPJiiCv  
   HotKey[index]=cKey; @mCe{r*`  
   HotKeyMask[index]=cMask; MSmr7%g3D  
   bAdded=TRUE; .zgh,#=  
   KeyCount++; )7 Mss/2T  
   break;  g!}]FQBb  
  } r,JQR)l0@V  
 } J!l/.:`6  
 return bAdded; N)"8CvQL  
} [_JdV(]$  
n0lOq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *<sc[..)  
{ ~pZ0B#K J  
 BOOL bRemoved=FALSE; &{? M} 2I  
 for(int index=0;index<MAX_KEY;index++){ sbmtx/%U  
  if(hCallWnd[index]==hWnd){ +bE{g@%@ +  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %4LoEm=U  
    hCallWnd[index]=NULL; jQ V[zcM  
    HotKey[index]=0; p9)YRLOh.  
    HotKeyMask[index]=0; 'd~(=6J  
    bRemoved=TRUE; VZt%cq  
    KeyCount--; Wo "s;Z  
    break; S' $;  
   } CK[8y&  
  } P4#i]7%  
 } 3Rb#!tx9  
 return bRemoved; ,cNe-KJk  
} NVx>^5QV  
7n#-3#_mG  
void VerifyWindow() R>0[w$  
{ SEM?vQ 0"}  
 for(int i=0;i<MAX_KEY;i++){ HTYyX(ya  
  if(hCallWnd!=NULL){ X|a{Z*y;r*  
   if(!IsWindow(hCallWnd)){ q~}oU5  
    hCallWnd=NULL; Tv"T+!Z  
    HotKey=0; UDI\o1Rbp  
    HotKeyMask=0; $_F_%m"\  
    KeyCount--; j;`pAN('  
   } 5@xR`g-  
  } oT\K P  
 } Ga 5s9wC  
} cjL)M=pIS  
a_c(7bQ  
BOOL CHookApp::InitInstance() DujVV(+I  
{ B<I(t"s  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d0)]^4HT|y  
 hins=AfxGetInstanceHandle(); q%x i>H.:{  
 InitHotkey(); +A?P4}  
 return CWinApp::InitInstance(); @.7/lRr@bp  
} }W'j Dz7O  
 [p6:uNo  
int CHookApp::ExitInstance() ]B )nN':  
{ c ?CD;Pk  
 VerifyWindow(); D`@a*YIq  
 UnInit(); wKpBH}  
 return CWinApp::ExitInstance(); Q$ew.h  
} N~flao^  
Xr K29a  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^<!R%"o-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ULt5Zi  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ WkiT,(i  
#if _MSC_VER > 1000 6agq^wI  
#pragma once 6#Z] yk+p  
#endif // _MSC_VER > 1000  lPZ>#  
FQ4R>@@5  
class CCaptureDlg : public CDialog n,FyK`x  
{ o:{Sws(=  
 // Construction dI\_I]  
 public: `:=1*7)?  
  BOOL bTray; ;J|t-$Z  
  BOOL bRegistered; Az@@+?,%Y  
  BOOL RegisterHotkey(); X[$h &]  
  UCHAR cKey; he~8V.$  
  UCHAR cMask; tn$TyCzckW  
  void DeleteIcon(); z6U'"T"a  
  void AddIcon(); 4tkT\.  
  UINT nCount; \C$e+qb~{  
  void SaveBmp(); In1{&sS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }169]!R  
  // Dialog Data RVA ku  
  //{{AFX_DATA(CCaptureDlg) _b<;n|^  
  enum { IDD = IDD_CAPTURE_DIALOG }; KyrZ&E.`  
  CComboBox m_Key; A@>/PB6n  
  BOOL m_bControl; :lXY% [!6P  
  BOOL m_bAlt; ,+df=>$W  
  BOOL m_bShift; t|'%0 W  
  CString m_Path; hk=[v7  
  CString m_Number; 0JtM|Mg  
  //}}AFX_DATA DU6j0lz  
  // ClassWizard generated virtual function overrides LN+x!#:e  
  //{{AFX_VIRTUAL(CCaptureDlg) bJn&Y  
 public: /%;J1 {O  
  virtual BOOL PreTranslateMessage(MSG* pMsg); BeFyx"NBg  
 protected: wKi#5k2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^S`hKv&87  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2n3&uvf'TL  
  //}}AFX_VIRTUAL f5F-h0HF`[  
  // Implementation bz>\n"'  
 protected: K W&muD  
  HICON m_hIcon; HsTY*^V  
  // Generated message map functions R=.?el  
  //{{AFX_MSG(CCaptureDlg) xY]q[a?cy  
  virtual BOOL OnInitDialog(); 9^DAlY,x.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w>*Jgc@A*  
  afx_msg void OnPaint(); YT?Lt!cl=  
  afx_msg HCURSOR OnQueryDragIcon(); g^ ?G)>  
  virtual void OnCancel(); atpHv**D<i  
  afx_msg void OnAbout(); <eEIR  
  afx_msg void OnBrowse(); c<Cf|W  
  afx_msg void OnChange(); 9]+zZP_#  
 //}}AFX_MSG lwfS$7^P  
 DECLARE_MESSAGE_MAP() 4*Hzys[{  
}; BDf M4  
#endif F)~>4>hPr  
/TsXm-g#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lF64g  
#include "stdafx.h" Iq%<E:+GL  
#include "Capture.h" $yi:0t8t  
#include "CaptureDlg.h" G0!6rDu2,  
#include <windowsx.h> Jf4` 2KN\  
#pragma comment(lib,"hook.lib") q`PA~C];  
#ifdef _DEBUG 1|8Bv0-b  
#define new DEBUG_NEW *Zg=cI@)(  
#undef THIS_FILE m19\H  
static char THIS_FILE[] = __FILE__; c/88|k  
#endif JYj*.Q0  
#define IDM_SHELL WM_USER+1 e 1XKlgl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .f0qgmIyL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hpXW t Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /[lEZ['^  
class CAboutDlg : public CDialog Il4]1d|  
{ MOh&1]2j5  
 public: 9b >+ehjB  
  CAboutDlg(); 4z P"h0  
  // Dialog Data >{ {ds--  
  //{{AFX_DATA(CAboutDlg) t0fgG/f'  
  enum { IDD = IDD_ABOUTBOX }; @D-I@Cyl  
  //}}AFX_DATA 7WH'GoBh  
  // ClassWizard generated virtual function overrides ? ch?q~e)  
  //{{AFX_VIRTUAL(CAboutDlg) oU,8?( }'~  
 protected: 5uG^`H@X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L/Kb\\f  
  //}}AFX_VIRTUAL a$?d_BX  
  // Implementation z\<,}x}V  
 protected: ma-GvWD2  
  //{{AFX_MSG(CAboutDlg) Lk]|;F-2i  
  //}}AFX_MSG 9h+Hd&=  
  DECLARE_MESSAGE_MAP() ,j>FC j>  
}; @7"n X  
9=$ pV==  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ' *XIp:  
{ l?"^2in .  
 //{{AFX_DATA_INIT(CAboutDlg) sg-^ oy*^  
 //}}AFX_DATA_INIT /-!Fr:Ox>  
} O)V;na  
&8f/6dq  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jNx{*2._r  
{ $k )K}U  
 CDialog::DoDataExchange(pDX); kF'9@*?J  
 //{{AFX_DATA_MAP(CAboutDlg) qbSI98r w  
 //}}AFX_DATA_MAP g$C]ln>"9m  
} +d LUq2  
ShVR{gIs  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v&G9HiH  
 //{{AFX_MSG_MAP(CAboutDlg) ,&3+w ~Ua  
 // No message handlers Y(`Bc8h  
 //}}AFX_MSG_MAP *YH!L{y  
END_MESSAGE_MAP() ~pp< T  
.9Oj+:n  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !21G $ [H  
: CDialog(CCaptureDlg::IDD, pParent) %pWJ2J@  
{ CLZ j=J2  
 //{{AFX_DATA_INIT(CCaptureDlg) >0:3CpO*  
  m_bControl = FALSE; O[$X36z  
  m_bAlt = FALSE; ?glx8@  
  m_bShift = FALSE; N:Q.6_%^  
  m_Path = _T("c:\\"); 0sSBwG  
  m_Number = _T("0 picture captured."); NUb$PT  
  nCount=0; bA 0H  
  bRegistered=FALSE; ?s>_^xfD  
  bTray=FALSE; QqF*SaO>  
 //}}AFX_DATA_INIT zqU$V~5;rG  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 }\H. G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jtfC3E,U  
} cM9> V2:P  
<,p$eQ)T%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) x])j]k  
{ gktlwiCZ  
 CDialog::DoDataExchange(pDX); X ]&`"Z]  
 //{{AFX_DATA_MAP(CCaptureDlg) 82r{V:NCK)  
  DDX_Control(pDX, IDC_KEY, m_Key); !7~4`D c6U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o$->|k  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  8zRw\]?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4e\wC  
  DDX_Text(pDX, IDC_PATH, m_Path); fA?Wf[`x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4MDVR/Z7  
 //}}AFX_DATA_MAP 'HfI~wN  
} [7x;H  
'bZw-t!M@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) V6ECL6n  
//{{AFX_MSG_MAP(CCaptureDlg) Xo(W\Pes  
 ON_WM_SYSCOMMAND() JcP<@bb>B  
 ON_WM_PAINT() HL[V}m  
 ON_WM_QUERYDRAGICON() S.iUiS"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `ba<eT':  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) i)cG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) n&]J-^Tx  
//}}AFX_MSG_MAP Z>w@3$\z  
END_MESSAGE_MAP() :-+][ [  
E{-pkqx  
BOOL CCaptureDlg::OnInitDialog() _{^F8  
{ dUn]aS  
 CDialog::OnInitDialog(); [Z'4YXS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2>x[_  
 ASSERT(IDM_ABOUTBOX < 0xF000); /^{Q(R(X<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *a_QuEw _k  
 if (pSysMenu != NULL) .'+JA:3R  
 { b)XGr?  
  CString strAboutMenu; |1!|SarM{B  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c\P}Z Q  
  if (!strAboutMenu.IsEmpty()) *2pE39  
  { 4;H m%20g  
   pSysMenu->AppendMenu(MF_SEPARATOR); Y8s-cc(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @:'E9J06  
  } 26_PFHQu4  
 } ;$!0pxL)s  
 SetIcon(m_hIcon, TRUE); // Set big icon MD1d  
 SetIcon(m_hIcon, FALSE); // Set small icon <;+QK=f  
 m_Key.SetCurSel(0); Lrx"Hn{  
 RegisterHotkey(); |M<R{Tt}nf  
 CMenu* pMenu=GetSystemMenu(FALSE); } -hH2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \sVzBHy d  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EG=U](8T  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); },5LrX`L  
 return TRUE; // return TRUE unless you set the focus to a control [A!=Hv_$  
} H lFVc  
{![E)~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bDw\;bnG  
{ b1e)w?n  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :SF8t`4`  
 { R*dXbI&,e  
  CAboutDlg dlgAbout; |SJ%Myy  
  dlgAbout.DoModal(); ^CDh! )  
 } Bt\V1)  
 else I.6#>=  
 { =`(\]t"I  
  CDialog::OnSysCommand(nID, lParam); aQ 6T2bQ  
 } hA~5,K0b  
} ER]C;DYX  
ocp3JR_0  
void CCaptureDlg::OnPaint() |@>Zc5MY$  
{ M@.?l=1X  
 if (IsIconic()) :e_yOT}}  
 { lQ.3_{"s  
  CPaintDC dc(this); // device context for painting /KJWo0zo  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Tc;BE  
  // Center icon in client rectangle 6Vu??qBy  
  int cxIcon = GetSystemMetrics(SM_CXICON); @yPI$"Ma  
  int cyIcon = GetSystemMetrics(SM_CYICON); V3pn@'pr  
  CRect rect; =8qhK=&]  
  GetClientRect(&rect); Mr K?,7*Xi  
  int x = (rect.Width() - cxIcon + 1) / 2; #DTBdBh?I  
  int y = (rect.Height() - cyIcon + 1) / 2; EX3;|z@5;  
  // Draw the icon 'aZAWY d  
  dc.DrawIcon(x, y, m_hIcon); 97 !VH> MX  
 } 5i3 nz=~o  
 else ybm&g( -\  
 { n lvDMZ  
  CDialog::OnPaint(); TU8K\;l]  
 } `p^xdj}  
} `jFvG\aC  
a<D]Gz^h  
HCURSOR CCaptureDlg::OnQueryDragIcon() [;INVUwG^  
{ v[ y|E;B  
 return (HCURSOR) m_hIcon; E"H> [E  
} ;{>-K8=>$  
b WZ X  
void CCaptureDlg::OnCancel() vC5 (  
{ e-{4qt  
 if(bTray) BA0.B0+"  
  DeleteIcon(); V :4($  
  CDialog::OnCancel(); 5HbPS%^.  
} o|a]Q  
n)teX.ck)  
void CCaptureDlg::OnAbout() A832z`  
{ pK2n'4 C  
 CAboutDlg dlg; ] yXrD`J!  
 dlg.DoModal(); J 9k~cz  
} ! XNTk]!  
9=^4p=1J  
void CCaptureDlg::OnBrowse() .l&<-l;UQ  
{ ~{O@tt)F  
 CString str; =gr3a,2  
 BROWSEINFO bi; {~d8_%:b  
 char name[MAX_PATH]; oG;;='*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); rU1{a" {  
 bi.hwndOwner=GetSafeHwnd(); ut^^,w{o>  
 bi.pszDisplayName=name; ViT$]Nv  
 bi.lpszTitle="Select folder"; VlFDMw.4.+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e_pyjaY!s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); M}6? |ir  
 if(idl==NULL) wms8z  
  return; U5wO;MA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cS1BB#N0  
 str.ReleaseBuffer(); |2~fOyA+  
 m_Path=str; >;@hA*<  
 if(str.GetAt(str.GetLength()-1)!='\\') eqE%ofW  
  m_Path+="\\"; lFL iW  
 UpdateData(FALSE); gobqS+c  
} Z66@@?`  
S}*%l)vfR  
void CCaptureDlg::SaveBmp() @=[ SsS  
{ )TcW.d6  
 CDC dc; $r=Ud >  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ` 5Qo*qx  
 CBitmap bm; 4 p(KdYc  
 int Width=GetSystemMetrics(SM_CXSCREEN); OW<5,h  
 int Height=GetSystemMetrics(SM_CYSCREEN); G" Fd]'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =#<TE~n2(  
 CDC tdc; #zcnc$x\  
 tdc.CreateCompatibleDC(&dc); [0e}%!%M  
 CBitmap*pOld=tdc.SelectObject(&bm); C[O \aW  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P1 `-OM  
 tdc.SelectObject(pOld); Gv}h/zu-  
 BITMAP btm; 9m fYB  
 bm.GetBitmap(&btm); e$^O_e  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7L:$Amb_F  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;-d :!*  
 BITMAPINFOHEADER bih; M -df Gk  
 bih.biBitCount=btm.bmBitsPixel; i'%:z]hp9  
 bih.biClrImportant=0; q|%(47}z  
 bih.biClrUsed=0; ^\<1Y''  
 bih.biCompression=0; xe6 2gaT  
 bih.biHeight=btm.bmHeight; daZY;_{"o  
 bih.biPlanes=1; ATU 2\Y  
 bih.biSize=sizeof(BITMAPINFOHEADER); =kvYE,,g_  
 bih.biSizeImage=size; WVf>>E^1  
 bih.biWidth=btm.bmWidth; ~l@SGHx  
 bih.biXPelsPerMeter=0; cwxO| .m  
 bih.biYPelsPerMeter=0; G =+sW  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); a[GlqaQy+-  
 static int filecount=0; b='YCa  
 CString name; "+ji`{  
 name.Format("pict%04d.bmp",filecount++); ukr a)>Y[|  
 name=m_Path+name;  3y?ig2  
 BITMAPFILEHEADER bfh; pr[[)[]/  
 bfh.bfReserved1=bfh.bfReserved2=0; T(^<sjOs  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &4yI]  
 bfh.bfSize=54+size; |vnfY; ;z1  
 bfh.bfOffBits=54; )*iSN*T8q  
 CFile bf; jn#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <5~} !N X`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ee##:I[z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X] /r'Tz  
  bf.WriteHuge(lpData,size); s Hu~;)  
  bf.Close(); '@iS5Fni  
  nCount++; x=bAR%i~  
 } xF_ Y7rw1w  
 GlobalFreePtr(lpData); xxm1Nog6  
 if(nCount==1) KwRO?G9&  
  m_Number.Format("%d picture captured.",nCount); % ;2x.  
 else Oav^BhUO  
  m_Number.Format("%d pictures captured.",nCount); cV5Lp4wY?  
  UpdateData(FALSE); swnov[0  
} -~ `5kO~  
>b0e"eGt  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n}yqpW!%n  
{ R/iw#.Yy  
 if(pMsg -> message == WM_KEYDOWN) u[^(s_  
 { ^m{kn8  
  if(pMsg -> wParam == VK_ESCAPE) (CH F=g  
   return TRUE; ue$\ i=jw  
  if(pMsg -> wParam == VK_RETURN) -[x^z5Ee`  
   return TRUE; Y=4,d4uu  
 } ~/h P6*  
 return CDialog::PreTranslateMessage(pMsg); h8O[xca/~  
} t}`|\*a  
Vl?R?K=`~J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d;(L@9HHD  
{ Tfgx>2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +tOBt("5/  
  SaveBmp(); JB'q_dS}  
  return FALSE; w=3@IW  
} v/Z}|dT"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ NJ 7N*   
 CMenu pop; 6$b"tdP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +?(2-RBd  
 CMenu*pMenu=pop.GetSubMenu(0); >&aFSL,f  
 pMenu->SetDefaultItem(ID_EXITICON); 2:/'  
 CPoint pt; +*d,non6v  
 GetCursorPos(&pt); ^Y ~ ,s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L;5j hVy  
 if(id==ID_EXITICON) ev#d1s|<S  
  DeleteIcon(); ,ibI@8;#~'  
 else if(id==ID_EXIT) yK0Q,   
  OnCancel(); Yq#I# 2RD  
 return FALSE; }vxb, [#  
} hX 9.%-@sR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0:h;ots'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RoLUPy9U  
 AddIcon(); m^O:k"+!  
 return res; McxJ C<  
} _W]2~9  
.?_wcp=  
void CCaptureDlg::AddIcon() N*lq)@smq  
{ #2I[F  
 NOTIFYICONDATA data; Fkz+Qz  
 data.cbSize=sizeof(NOTIFYICONDATA); R',|Jf=`  
 CString tip; YurK@Tq7  
 tip.LoadString(IDS_ICONTIP); |I7P 0JqP  
 data.hIcon=GetIcon(0); X`:(-3T  
 data.hWnd=GetSafeHwnd(); xp1 +C{  
 strcpy(data.szTip,tip); *WfOB2rU  
 data.uCallbackMessage=IDM_SHELL; + yS"pOT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q uv`~qn  
 data.uID=98; %zd1\We  
 Shell_NotifyIcon(NIM_ADD,&data); 7l7eUy/z  
 ShowWindow(SW_HIDE); vf~q%+UqK  
 bTray=TRUE; RXt`y62yK  
} } ~=53$+  
\Q*3/_}G  
void CCaptureDlg::DeleteIcon() f&ZxG,]H i  
{ >('L2]4\v  
 NOTIFYICONDATA data; :{LVS nG  
 data.cbSize=sizeof(NOTIFYICONDATA); &.=d,XKN  
 data.hWnd=GetSafeHwnd(); U-3KuR+0  
 data.uID=98; 1F/`*z  
 Shell_NotifyIcon(NIM_DELETE,&data); gUL`)t\}*  
 ShowWindow(SW_SHOW); ePIBg(  
 SetForegroundWindow(); =a?l@dI]  
 ShowWindow(SW_SHOWNORMAL); {.H}+@0  
 bTray=FALSE; |vTirZP  
} .-`7Av+7  
Rr4r[g#  
void CCaptureDlg::OnChange() vV#Jl) A  
{ +tdt>)a  
 RegisterHotkey(); w^p 'D{{  
} 0d`s(b54;O  
RE oFP;H~  
BOOL CCaptureDlg::RegisterHotkey() #TZYe4#f  
{ [_L:.,]g8  
 UpdateData(); %I(N  
 UCHAR mask=0; nrwb6wj  
 UCHAR key=0; 0l.+yr}PE  
 if(m_bControl) -q(,}/Xf  
  mask|=4; ;TMH.E,h:  
 if(m_bAlt) z6|P]u  
  mask|=2; E} Uy-  
 if(m_bShift) }/(fe`7:  
  mask|=1; .4_EaQ;jX  
  key=Key_Table[m_Key.GetCurSel()]; isDBNXV:  
 if(bRegistered){ 8\. #  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0D|^S<z6  
  bRegistered=FALSE; o*f7/ZP1o  
 } 4zpprh+`K  
 cMask=mask; /r[0Dw  
 cKey=key; 'e7<&wm ia  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8Th|'  
 return bRegistered; A37Z;/H~k  
} 3,oFT   
1-r1hZ-  
  四、小结 ]8d]nftY  
zJ3{!E}`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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五