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
  • 5377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: {/8Q)2*>0  
  TO#Pz.)>B6  
  一、实现方法 V5mTu)tp5  
u{e-G&]^;  
  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: r4XH =  
0C$vS`s&  
#pragma data_seg("shareddata") 7 hw .B'7  
HHOOK hHook =NULL; //钩子句柄 .*/Fucr  
UINT nHookCount =0; //挂接的程序数目 #"*e+.j[;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L>9R4:g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 G}zZQy  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey uGP(R=H  
static int KeyCount =0; &#w=7L3AW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -ysn&d\rV  
#pragma data_seg() =:I+6PlF@  
(p)!Mq "^  
  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。 UQ?%|y*Kc  
dJk9@u  
  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: _lxco=qd=%  
f'Mop= .  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,. EBOUW^  
cKey,UCHAR cMask) Dm0a.J v  
{ !cX[-}Q  
 BOOL bAdded=FALSE;  H`QQG!  
 for(int index=0;index<MAX_KEY;index++){ PAF8W lg  
  if(hCallWnd[index]==0){ 7(a2L&k^  
   hCallWnd[index]=hWnd; dY!Z  
   HotKey[index]=cKey; nHXX\i  
   HotKeyMask[index]=cMask; :!TI K1  
   bAdded=TRUE; Xl-e !  
   KeyCount++; 3lxc4@Zmd  
   break; 6<'K~1do:  
  }  $)~   
 } S~OhtHwK  
 return bAdded; bZwnaM4"F  
} KW3+luI6  
//删除热键 b7:0#l$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2tQ`/!m>v$  
{ Z}6^ve  
 BOOL bRemoved=FALSE; Q / x8 #X  
 for(int index=0;index<MAX_KEY;index++){ $% k1fa C  
  if(hCallWnd[index]==hWnd){ 6QQfQ,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >!6JKL~=  
    hCallWnd[index]=NULL; *?p|F&J  
    HotKey[index]=0;  Ukz;0q  
    HotKeyMask[index]=0; ?)4?V\$  
    bRemoved=TRUE; ;t#]2<d*  
    KeyCount--; {tP%epQ  
    break; p<Z3tD;Z  
   } },$0&/>ft  
  } g=@_Z"  
 } |,C#:"z;  
 return bRemoved; j{++6<tr  
} r),PtI0X  
[I*! lbt  
iP@6hG`:  
  DLL中的钩子函数如下: #s-iy+/1oN  
z,SYw &S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6aft$A}XnD  
{ 3Hi+Z}8  
 BOOL bProcessed=FALSE; tl yJmdl  
 if(HC_ACTION==nCode) PyC0Q\$%  
 { ~"x5U{K48S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y^>Q/H\  
   switch(wParam) F0Jx(  
   {  6]cryf&b  
    case VK_MENU: upn~5>uCP  
     MaskBits&=~ALTBIT; ;!>Wz9  
     break; IXLO>>`  
    case VK_CONTROL: w&h 2y4  
     MaskBits&=~CTRLBIT; dIwe g=x  
     break; :Sg&0Wj+#j  
    case VK_SHIFT: 'fV%Z  
     MaskBits&=~SHIFTBIT; jR ~DToQ  
     break; f7urJ'!V  
    default: //judge the key and send message F t&+vS  
     break; 7u.|XmUz  
   } < E|s\u  
   for(int index=0;index<MAX_KEY;index++){ pE]?x $5U  
    if(hCallWnd[index]==NULL) -F/st  
     continue;  ,*id'=S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `1` f*d v  
    { 6SM:x]`##,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); od<b!4k~s  
     bProcessed=TRUE; qZk'tRv  
    } FjfN3#qlg  
   } \kIMDg3}  
  } le)DgIT>=  
  else if((lParam&0xc000ffff)==1){ //有键按下 _;9!  
   switch(wParam) Lm*VN~2  
   { R,2=&+ e  
    case VK_MENU: 8^^[XbH  
     MaskBits|=ALTBIT; t@oK~ Nr  
     break; 5AeQQU  
    case VK_CONTROL: [dX`K`k  
     MaskBits|=CTRLBIT; e;YW6}'}  
     break; ^n.WZUk  
    case VK_SHIFT: '(+<UpG_Q}  
     MaskBits|=SHIFTBIT; X&m'.PA  
     break; A~ (l{g  
    default: //judge the key and send message %GEJnJ  
     break; SjEAuRDvUz  
   } !<@J6??a}s  
   for(int index=0;index<MAX_KEY;index++){ h&@R| N  
    if(hCallWnd[index]==NULL) :c[n\)U[aa  
     continue; eL D?jTi'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hIv@i\`  
    { K r`]_m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `<"m%>  
     bProcessed=TRUE; `D5HC  
    } 7Du1RuxP  
   } :VmHfOO  
  } Pi2|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K!AAGj`  
   for(int index=0;index<MAX_KEY;index++){ 1M3% fW  
    if(hCallWnd[index]==NULL) th5g\h%j*  
     continue; YA(@5CZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -|yb[~3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %i0?UpA  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4b]a&_-}  
   } @+,pN6}g  
  } _>o-UBb4]T  
 } Q-TV*FD.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s Wjy6;  
} _1Z=q.sC  
bEuaOBc  
  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=FQGWAUu  
L?&'xzt B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eBN)g^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wt }9B[  
@{ ;XZb^  
  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: }}{!u0N},V  
J<n+\F-s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^>4o$}  
{ *y[PNqyd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vW,snxK6y&  
 { }]P4-KqI  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <pLT'Y=  
  SaveBmp(); em@EDMvI  
  return FALSE; /x@RNdKv  
 } J<j&;:IRd  
 …… //其它处理及默认处理 m@Ev~~;  
} +';>=hha  
Nf,Z;5e  
.~lKBkS`!  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ~!6K]hB4  
aiCFH_H4;L  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ,0$)yZ3*3,  
'$|UwT`s  
  二、编程步骤 G*[P <<je_  
Aez2*g3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; D6D1S/:ij'  
JEn3`B!*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; zQy"m-Q  
:y]Omp  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Sywu=b  
R_P}~l  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Zzua17  
}SyxPXs  
  5、 添加代码,编译运行程序。 <M?:  
2 mjV~  
三、程序代码 _S0+;9fhY  
kW3E =pr  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL H2gj=krK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ,n,RFa  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Lju7,/UD  
#if _MSC_VER > 1000 =?0lA_ 0  
#pragma once w-B^ [<  
#endif // _MSC_VER > 1000 j '%4{n  
#ifndef __AFXWIN_H__ ]T! }XXK  
#error include 'stdafx.h' before including this file for PCH c{ZY,C&<  
#endif CLD-mx|?  
#include "resource.h" // main symbols d87vl13  
class CHookApp : public CWinApp n#Dv2 E=6  
{  n]W_e  
 public: }n,Zl>T9  
  CHookApp(); `i~ Y Fr  
  // Overrides fpyz'   
  // ClassWizard generated virtual function overrides Fh7'[>onw  
  //{{AFX_VIRTUAL(CHookApp) 4o:hyh   
 public: >M!xiQX  
  virtual BOOL InitInstance(); 2],_^XBvB  
  virtual int ExitInstance(); | aQ"3d  
  //}}AFX_VIRTUAL ` >!n  
  //{{AFX_MSG(CHookApp) fBtm%f  
  // NOTE - the ClassWizard will add and remove member functions here. v ]Sl<%ry  
  // DO NOT EDIT what you see in these blocks of generated code ! 6Z?j AXGSq  
  //}}AFX_MSG bSwWszd~  
  DECLARE_MESSAGE_MAP() B-.v0R`5  
}; " }gVAAvc7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %wV>0gQTf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a\uie$"cr]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iyZZ}M  
BOOL InitHotkey(); C.:=lo B  
BOOL UnInit(); y@bcYOh3  
#endif EY`H}S!xy  
38V3o`f  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. egR9AEJvz  
#include "stdafx.h" g3@Rl2yQJ  
#include "hook.h" RIM`omM  
#include <windowsx.h> h 6G/O`:  
#ifdef _DEBUG 9n]|PEoAB  
#define new DEBUG_NEW ~cAZB9Fa  
#undef THIS_FILE Oh.ZPG=  
static char THIS_FILE[] = __FILE__; YIt9M,5/Q  
#endif a^qNJ?R !  
#define MAX_KEY 100 FFhtj(hVgc  
#define CTRLBIT 0x04 q+SD6qM  
#define ALTBIT 0x02 }y%`)lz~;  
#define SHIFTBIT 0x01 ,7Y-k'7Kop  
#pragma data_seg("shareddata") E9j+o y  
HHOOK hHook =NULL; 3T\l]? z  
UINT nHookCount =0; eC DIwB28  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |9xI_(+{kP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ymY1o$qWB}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LVIAF0kX  
static int KeyCount =0; P47V:E%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 6[ qA`x#  
#pragma data_seg() foF19_2 ,  
HINSTANCE hins; w"m+~).U  
void VerifyWindow(); .%EL\2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) o!TQk{0  
//{{AFX_MSG_MAP(CHookApp) rsn.4P=  
// NOTE - the ClassWizard will add and remove mapping macros here. 8rZ!ia!  
// DO NOT EDIT what you see in these blocks of generated code! 7T``-:`[  
//}}AFX_MSG_MAP }/dRU${!  
END_MESSAGE_MAP() zo{/'BnU  
XKL3RMF9r  
CHookApp::CHookApp() P;ZU-G4@   
{ m .IU ;cR  
 // TODO: add construction code here, HysS_/t~  
 // Place all significant initialization in InitInstance <%}QDO8\i  
} )"(]Lf's  
h!@|RW&}qX  
CHookApp theApp; |LG4=j.l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V~DMtB7  
{ [sV"ws  
 BOOL bProcessed=FALSE; @tohNO>  
 if(HC_ACTION==nCode) M6 9 w-  
 { "eWk#/  
  if((lParam&0xc0000000)==0xc0000000){// Key up m~#!  
   switch(wParam) 8kE]_t  
   { ulT8lw='  
    case VK_MENU: _CBWb  
     MaskBits&=~ALTBIT; j| Wv7  
     break; C,V%B  
    case VK_CONTROL: [u@Jc,  
     MaskBits&=~CTRLBIT; v`J*ixZ7t  
     break; e:E0"<  
    case VK_SHIFT: "]'?a$\ky:  
     MaskBits&=~SHIFTBIT; #?MY&hdU9  
     break; v$~QCtc  
    default: //judge the key and send message 6%`&+Lq  
     break; +h^jC9,m~{  
   } mC&=X6Q]  
   for(int index=0;index<MAX_KEY;index++){ I +5)Jau^S  
    if(hCallWnd[index]==NULL) \}6;Kf}\  
     continue; i"zuil  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vt^3iX{!  
    { 5Dp#u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a8u 9aEB  
     bProcessed=TRUE; }7fZ[J3  
    } o)6pA^+  
   } )}Q(Tl\$  
  } 6-`|:[Q~  
  else if((lParam&0xc000ffff)==1){ //Key down V$0dtvGvH  
   switch(wParam) 5vo.[^ty  
   { *vgl*k?)  
    case VK_MENU: @3fn)YQ'  
     MaskBits|=ALTBIT; KKA~#iCk  
     break; iu**`WjI\  
    case VK_CONTROL: }'r[m5T  
     MaskBits|=CTRLBIT; ,Vd\m"K{  
     break; 8u[-'pV!  
    case VK_SHIFT: GdB.4s^  
     MaskBits|=SHIFTBIT; PcB_oG g  
     break; [{4 MR%--  
    default: //judge the key and send message |+  N5z  
     break; %h1N3\y9i(  
   } I%|>2}-_U  
   for(int index=0;index<MAX_KEY;index++) pEECHk  
   { =to=8H-  
    if(hCallWnd[index]==NULL) ?!qY,9lhH  
     continue; '` 'GK&)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~['Kgh_;  
    { zf3v5Hk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2Q;9G6p  
     bProcessed=TRUE; 2VW}9O  
    } |t$Ma'P  
   } +cb6??H  
  } TW !&p"Us+  
  if(!bProcessed){ FP[!BUOf"  
   for(int index=0;index<MAX_KEY;index++){ 6c0>gUQx-  
    if(hCallWnd[index]==NULL) T843":  
     continue; f#ri'&}c :  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $d?.2Kg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O25lLNmO  
   } Uye|9/w8 !  
  } S/;bU :  
 } oyo(1 >  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -i-?.:  
} \EseGgd21  
X.`~>`8  
BOOL InitHotkey() UGK*Gy  
{ #^+DL]*l  
 if(hHook!=NULL){ |>@W ]CX[  
  nHookCount++; 3Hf0MAt  
  return TRUE; A!^q J#  
 } {v3P9s(  
 else `~eUee3b.~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4Qn$9D+?  
  if(hHook!=NULL) ftH:r_"O#  
   nHookCount++; $1ndKB8)`J  
  return (hHook!=NULL); 7gRgOzWfV  
} 3_A *$  
BOOL UnInit() 4tY ss  
{ HaIM#R32T  
 if(nHookCount>1){ -W>'^1cR  
  nHookCount--; v+9 9 -.  
  return TRUE; g}]t[}s1]  
 } J4Dry<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [=~pe|8:  
 if(unhooked==TRUE){ nT2)E&U6%  
  nHookCount=0; .bio7c6  
  hHook=NULL; Yup3^E w&  
 } v0L\0&+  
 return unhooked; @IXsy  
} mc4i@<_?  
rx}r~0i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) + nF'a(  
{ H/}]FmjN  
 BOOL bAdded=FALSE;  W%\C_  
 for(int index=0;index<MAX_KEY;index++){ NIw\}[-Z0E  
  if(hCallWnd[index]==0){ ,i@X'<;y  
   hCallWnd[index]=hWnd; @V!r"Bkg.  
   HotKey[index]=cKey; g:EVhuK  
   HotKeyMask[index]=cMask; 08*v~(T  
   bAdded=TRUE; !F?XLekTi  
   KeyCount++; Pi|o`d  
   break; $q 2D+_  
  } Vx-7\NB  
 } 3 h<,  
 return bAdded; &iV{:)L  
} c/ uNM  
A~mum+[5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b".L_Ma1*  
{ TiH) 5  
 BOOL bRemoved=FALSE; n93=8;&  
 for(int index=0;index<MAX_KEY;index++){ p'om-  
  if(hCallWnd[index]==hWnd){ edPUG N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b6*!ACY  
    hCallWnd[index]=NULL; $cZUM}@  
    HotKey[index]=0; h;0S%ZC  
    HotKeyMask[index]=0; K^R,Iu/M  
    bRemoved=TRUE; "]G\9b)   
    KeyCount--; Sf r&p>{,  
    break; 1m.W<  
   } FJd]D[h  
  } ZIF49`Y4TF  
 } J4\qEO  
 return bRemoved; Q1z;/A$Al  
} Hik3wPnp  
}C|dyyr  
void VerifyWindow() \W`w` o  
{ 5+wAzVA  
 for(int i=0;i<MAX_KEY;i++){ 95V@X ^Ee  
  if(hCallWnd!=NULL){ &>Vfa  
   if(!IsWindow(hCallWnd)){ RH|XxH*  
    hCallWnd=NULL; ivz{L-  
    HotKey=0; & :7ZQ1  
    HotKeyMask=0; u#@Q:tnN_  
    KeyCount--; <=,6p>Eo[  
   } s@7H1)U  
  } O &-wxJ]S  
 } |.3DD"*  
} Xp}Yw"7  
@i*|s~15  
BOOL CHookApp::InitInstance() 6!(@@^7{*  
{ WH \)) y-  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); jNC4_q&  
 hins=AfxGetInstanceHandle(); QMpoa5ZQG  
 InitHotkey(); lO_UPC\@fw  
 return CWinApp::InitInstance(); Ho *AAg  
} N~xLu8,  
/n8B,-Z5s5  
int CHookApp::ExitInstance() Kc^;vT>3  
{ ih;]nJ]+-  
 VerifyWindow(); D N*t~Z3[  
 UnInit(); _zwUE  
 return CWinApp::ExitInstance(); ` 5C~  
} qC?:*CXH  
E\4 +_L_j  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file X7g1:L1Ys  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >:|q&|x-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fw RZ5`v<  
#if _MSC_VER > 1000 X.e7A/ClEo  
#pragma once xcf%KXJf6  
#endif // _MSC_VER > 1000 GHeVp/u  
 1OF& *  
class CCaptureDlg : public CDialog i?F >+  
{ 8UVmv=T  
 // Construction &sL&\+=<(  
 public: a0ObBe'  
  BOOL bTray; aWY gR  
  BOOL bRegistered; \9g+^vQg  
  BOOL RegisterHotkey(); w2'f/  
  UCHAR cKey; +qwjbA+  
  UCHAR cMask; TTTPxO,  
  void DeleteIcon(); qDfd.gL  
  void AddIcon(); B,=H@[Fj  
  UINT nCount; W!>.$4Q9  
  void SaveBmp(); uPl\I6k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2mGaD\?K  
  // Dialog Data &E=>Hj(dTG  
  //{{AFX_DATA(CCaptureDlg) $ . 9V&  
  enum { IDD = IDD_CAPTURE_DIALOG }; j_. 5r&w  
  CComboBox m_Key; 9^G/8<^^>  
  BOOL m_bControl;  D 'Zt  
  BOOL m_bAlt; Y1J=3Y  
  BOOL m_bShift; ?TKRjgW`@_  
  CString m_Path; l|k`YC x  
  CString m_Number; dKxyA"@  
  //}}AFX_DATA 7G>dTO  
  // ClassWizard generated virtual function overrides cbT7CG  
  //{{AFX_VIRTUAL(CCaptureDlg) n*{sTT  
 public: "pRtczxOgR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); d5gR"ja  
 protected: %YC_Se7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4QIX19{"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8;+B*+%@n  
  //}}AFX_VIRTUAL +yD`3` E  
  // Implementation $NZ-{dY{  
 protected: 8Y7Q+p|O  
  HICON m_hIcon; m~-K[+ya`D  
  // Generated message map functions &b fA.& `  
  //{{AFX_MSG(CCaptureDlg) vbC\?\_  
  virtual BOOL OnInitDialog(); u /\EtSH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); s pp f  
  afx_msg void OnPaint(); 9E>|=d|(d  
  afx_msg HCURSOR OnQueryDragIcon(); ne_TIwfw-  
  virtual void OnCancel(); n4R(.N00  
  afx_msg void OnAbout(); :6 Lx@  
  afx_msg void OnBrowse(); h_+dT  
  afx_msg void OnChange(); [Q/TlOt5  
 //}}AFX_MSG 5a|w+HO,  
 DECLARE_MESSAGE_MAP() 7KAO+\)H^Y  
}; <?riU\-]y  
#endif +oovx2r&  
K|hjEQRv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yEhTNBa*h{  
#include "stdafx.h" 8L:ji,"  
#include "Capture.h" ZL&g_jC  
#include "CaptureDlg.h" 4;0lvDD  
#include <windowsx.h> @ W[f1  
#pragma comment(lib,"hook.lib") zGA q-<  
#ifdef _DEBUG +~mA}psr  
#define new DEBUG_NEW IJ(  
#undef THIS_FILE 9NQlI1W z4  
static char THIS_FILE[] = __FILE__; Pa V@aM~3  
#endif 06c>$1-?  
#define IDM_SHELL WM_USER+1 x:7b/ j-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &h^9}>rVjV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1+jAz`nA:T  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 34%RZG_o'  
class CAboutDlg : public CDialog l0PZ`m+;j  
{ N`L0Vd  
 public: FtfKe"qw  
  CAboutDlg(); B"TAjB& *  
  // Dialog Data V@ cM|(  
  //{{AFX_DATA(CAboutDlg) 4{rZppm  
  enum { IDD = IDD_ABOUTBOX }; Q;43[1&3w  
  //}}AFX_DATA }%'?p<^M  
  // ClassWizard generated virtual function overrides #xQr<p$L6  
  //{{AFX_VIRTUAL(CAboutDlg) YkniiB[/  
 protected: V-Sd[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support clL2k8VS  
  //}}AFX_VIRTUAL bzuEfFaL  
  // Implementation |Lf"6^@yh  
 protected: CF&6J$ZBgJ  
  //{{AFX_MSG(CAboutDlg) k@f g(}6  
  //}}AFX_MSG [<g?WPCcC  
  DECLARE_MESSAGE_MAP() TgmnG/Z  
}; El[)?+;D  
pb ~u E  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :(!` /#6H  
{ Sa?ksD2IaB  
 //{{AFX_DATA_INIT(CAboutDlg) #h8Sq~0  
 //}}AFX_DATA_INIT kb{]>3Y"  
} (e!0]Io@  
vq^f}id  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aT)BR?OYSJ  
{ z(_Ss@ $  
 CDialog::DoDataExchange(pDX); U(Nu%  
 //{{AFX_DATA_MAP(CAboutDlg) w)kNkD  
 //}}AFX_DATA_MAP H:t$'kb`  
} KxYwJ  
2ORNi,_I  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }XV+gyG=@  
 //{{AFX_MSG_MAP(CAboutDlg) )}D'<^=#T  
 // No message handlers \W1,F6&j  
 //}}AFX_MSG_MAP R?~Yp?B^  
END_MESSAGE_MAP() tyXuG<  
CFzNwgv]z  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <>s`\ %  
: CDialog(CCaptureDlg::IDD, pParent) h]+C.Eqnt#  
{ Ox&P}P0f  
 //{{AFX_DATA_INIT(CCaptureDlg) v 1z  
  m_bControl = FALSE; 4wa`<H&S5  
  m_bAlt = FALSE; DoJ\ q+  
  m_bShift = FALSE; Vr6@> @SC  
  m_Path = _T("c:\\"); zLD0RBj7p  
  m_Number = _T("0 picture captured."); # {w9s 0:  
  nCount=0; S M0~fAtE  
  bRegistered=FALSE; 96 q_ K84K  
  bTray=FALSE; gVq;m>\|F  
 //}}AFX_DATA_INIT 4]G?G]lS>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hd>aZ"nm1  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q1O}ly}JS  
} SB1upTn  
Z*y`R XE  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ROg(U8 N  
{ T]t+E'sQ  
 CDialog::DoDataExchange(pDX); ]h>_\9qO  
 //{{AFX_DATA_MAP(CCaptureDlg) co~Pyj  
  DDX_Control(pDX, IDC_KEY, m_Key); &Sl[ lXE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qfL~Wp2E;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wfU7G[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9K5pwC\$%  
  DDX_Text(pDX, IDC_PATH, m_Path); 6l5:1|8b,!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); CN#+U,NZV  
 //}}AFX_DATA_MAP bSfpbo4(  
} ^* J2'X38I  
jT8#C=a7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lJu;O/  
//{{AFX_MSG_MAP(CCaptureDlg) "} q@Y=  
 ON_WM_SYSCOMMAND() $nb[G$  
 ON_WM_PAINT() ?&|5=>u2}$  
 ON_WM_QUERYDRAGICON() b%<9Sn   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ::ajlRZG  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7![,Q~Fy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Fs{x(_LOr  
//}}AFX_MSG_MAP MS\>DW  
END_MESSAGE_MAP() }\HN&@  
^aH \7J@Y  
BOOL CCaptureDlg::OnInitDialog() tNGp\~  
{ `8^TTQ  
 CDialog::OnInitDialog(); Pa{%\dsv  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DE%KW:Hug  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^.1c{0Y^0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); B$b +Ymu  
 if (pSysMenu != NULL) &d"G/6  
 { AD1=[I3  
  CString strAboutMenu; o Z%9_$Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ny`#%Vs  
  if (!strAboutMenu.IsEmpty()) ]}U*_rM:  
  { n^z]q;IN2.  
   pSysMenu->AppendMenu(MF_SEPARATOR); *^f<W6xc  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -7S g62THS  
  } KVD8YfF  
 } Z?%zgqTXb  
 SetIcon(m_hIcon, TRUE); // Set big icon  .Nw=[  
 SetIcon(m_hIcon, FALSE); // Set small icon f>W -  
 m_Key.SetCurSel(0); S-k8jm  
 RegisterHotkey(); A<1hOSCz\  
 CMenu* pMenu=GetSystemMenu(FALSE); lEhk'/~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,wIONDnLZ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); sC='_h  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i(iXD  
 return TRUE; // return TRUE unless you set the focus to a control }HY-uQ%@g  
}  OU8Lldt  
qMLD)rL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %@.v2 cT  
{ j#+!\ft5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z/t+8;TMR,  
 { Vl:^>jTki  
  CAboutDlg dlgAbout; *q()f\  
  dlgAbout.DoModal(); ,6om\9.E@  
 } NdzSz]q}  
 else  CCL   
 { 8=gjY\Dp  
  CDialog::OnSysCommand(nID, lParam); I~ok4L?VB  
 } CE/Xfh'44  
} ]=>F.GE  
>AcrG]  
void CCaptureDlg::OnPaint() LUqB&,a}  
{ wM2*#  
 if (IsIconic()) }Q=!Y>Tc  
 { BK,{N0  
  CPaintDC dc(this); // device context for painting 1+}{8D_F  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zmSUw}-4 N  
  // Center icon in client rectangle Q$="_y2cTA  
  int cxIcon = GetSystemMetrics(SM_CXICON); k +H3Bq  
  int cyIcon = GetSystemMetrics(SM_CYICON); QWzB6H]  
  CRect rect; no< ^f]33  
  GetClientRect(&rect); Yy)tmq  
  int x = (rect.Width() - cxIcon + 1) / 2; oxz OA  
  int y = (rect.Height() - cyIcon + 1) / 2; @wE5S6! B\  
  // Draw the icon d` jjGEj  
  dc.DrawIcon(x, y, m_hIcon); %F-ZN^R  
 } 1 D<_N  
 else L IZRoG8  
 { cm&I* 0\  
  CDialog::OnPaint(); `bZ/haU}A  
 } L5 veX}  
} aC%m-m  
:=wT vz  
HCURSOR CCaptureDlg::OnQueryDragIcon() vK _?<>  
{ HN&Z2v   
 return (HCURSOR) m_hIcon; "CUty"R 8  
} }>VG~u8  
}^/9G17  
void CCaptureDlg::OnCancel() :9$F'd\  
{ E}40oID  
 if(bTray) YN!>}  
  DeleteIcon(); ^(|vsFzn  
  CDialog::OnCancel(); <xgTS[k  
} iy14mh\ ~  
;K!]4tfJ  
void CCaptureDlg::OnAbout() m6',SY9T  
{ Bh=u|8yxc  
 CAboutDlg dlg; 34d3g  
 dlg.DoModal(); ZE2$I^DY-  
} q.2ykL  
O'W0q;rT  
void CCaptureDlg::OnBrowse() K)\M5id]  
{ mw='dFt  
 CString str; IuNiEtKx  
 BROWSEINFO bi; [$ejp>'Ud  
 char name[MAX_PATH]; t=-SH^$SR  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /Rg*~Ers *  
 bi.hwndOwner=GetSafeHwnd(); _c, '>aH=  
 bi.pszDisplayName=name; ,ztI,1"k  
 bi.lpszTitle="Select folder"; s;64N'HH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; H Ge0hl[n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \U[ {z&]~  
 if(idl==NULL) %5A+V0D0'  
  return; 4Rvf  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lhw ,J]0*  
 str.ReleaseBuffer(); US%^#D q  
 m_Path=str; tPGJ<30  
 if(str.GetAt(str.GetLength()-1)!='\\') t$A%*JBKm  
  m_Path+="\\"; uvV;Mlo]  
 UpdateData(FALSE); k5C@>J  
} k31I ysh  
mGGsB5#w>  
void CCaptureDlg::SaveBmp() TH$N5w%  
{ Xa[?^P  
 CDC dc; bf!M#QOk?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cg*)0U-_(  
 CBitmap bm; &bp=`=*  
 int Width=GetSystemMetrics(SM_CXSCREEN); CJXg@\\/  
 int Height=GetSystemMetrics(SM_CYSCREEN); {FG|\nPw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZG du|  
 CDC tdc; K%X^n>O7C  
 tdc.CreateCompatibleDC(&dc); Jte#ZnP  
 CBitmap*pOld=tdc.SelectObject(&bm); EB_NK  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); LJ(1RK GCz  
 tdc.SelectObject(pOld); C,pJ`:P  
 BITMAP btm; T7d9ChU\#.  
 bm.GetBitmap(&btm); i6 (a@KRY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _!?Hu/zo  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); GKFq+]W  
 BITMAPINFOHEADER bih; BZXUwqEh  
 bih.biBitCount=btm.bmBitsPixel; \0H's{uek  
 bih.biClrImportant=0; k!KDWb  
 bih.biClrUsed=0; 8-Hsgf.*  
 bih.biCompression=0; o)[2@fRC(  
 bih.biHeight=btm.bmHeight; nYt/U\n!  
 bih.biPlanes=1; ryc& n5  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5n ^TRB  
 bih.biSizeImage=size; ,s_T pq  
 bih.biWidth=btm.bmWidth; ]+m/;&0  
 bih.biXPelsPerMeter=0; a<A+4uXyD  
 bih.biYPelsPerMeter=0; v,\R, {0  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vUnRi=:|  
 static int filecount=0; b77>$[xB  
 CString name; ]Bm>-*@0N  
 name.Format("pict%04d.bmp",filecount++); W(Uu@^  
 name=m_Path+name; I6s3+x;O  
 BITMAPFILEHEADER bfh; f5GdZ_  
 bfh.bfReserved1=bfh.bfReserved2=0; ) 9oH,gZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e[Jem5C  
 bfh.bfSize=54+size; fI7j):h;  
 bfh.bfOffBits=54; wV)}a5+  
 CFile bf; j}AFE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vi)%$~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R i 'L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,= &B28Qe)  
  bf.WriteHuge(lpData,size); I Nc^L  
  bf.Close(); Hku!bJ  
  nCount++; n3`&zY  
 } 2PR^:h2  
 GlobalFreePtr(lpData); cf7v[ZZ}  
 if(nCount==1) :Yj) CGl$  
  m_Number.Format("%d picture captured.",nCount); \@;\t7~  
 else kpI{KISQu  
  m_Number.Format("%d pictures captured.",nCount); 1H,g=Y4f%  
  UpdateData(FALSE); _NcY I  
} )*5G">))p  
IjfxR mV  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) TbehR:B5g  
{ lI/0:|l  
 if(pMsg -> message == WM_KEYDOWN) nCKbgM'"  
 { 9F^;!  
  if(pMsg -> wParam == VK_ESCAPE) sIl33kmv  
   return TRUE; f):~8_0b  
  if(pMsg -> wParam == VK_RETURN) ZCg`z  
   return TRUE; 3},Zlu  
 }  pAu72O?  
 return CDialog::PreTranslateMessage(pMsg); jb /8?7  
} 0~& "  
S }>n1F_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'lS `s(  
{ w18RA#Zo/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z\/53Sy<  
  SaveBmp(); = zl= SLe  
  return FALSE; I@l>w._.  
} x>~p;z#VX  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ b8f+,2Tk  
 CMenu pop; M3zDtN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lr2 rQo >  
 CMenu*pMenu=pop.GetSubMenu(0); s^T+5 E&}  
 pMenu->SetDefaultItem(ID_EXITICON); E:nt)Ef,  
 CPoint pt; 2>\\@ 1  
 GetCursorPos(&pt); nVD Xj  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y@wF_WX2  
 if(id==ID_EXITICON) jLcHY-P0V  
  DeleteIcon(); RH~3M0'0  
 else if(id==ID_EXIT) \Z/k;=Sla  
  OnCancel(); o7+>G~i  
 return FALSE; 1'G8o=~  
} Vj; vo`T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ewo*yY>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (RXS~8  
 AddIcon(); 4(vyp.f  
 return res; ;T ZGC).6  
} &14W vAU  
ad!(z[F'Y  
void CCaptureDlg::AddIcon() P ,K\  
{ LNQSb4  
 NOTIFYICONDATA data; FoPginZ]J  
 data.cbSize=sizeof(NOTIFYICONDATA); !;>(i e\  
 CString tip; Xz;b,C&*t  
 tip.LoadString(IDS_ICONTIP); )Mzt3u  
 data.hIcon=GetIcon(0); .V%*{eHLL  
 data.hWnd=GetSafeHwnd(); r3I,11B  
 strcpy(data.szTip,tip); z^s ST  
 data.uCallbackMessage=IDM_SHELL; 4FA|[An  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; nR8]@cC  
 data.uID=98; L)-*,$#<oW  
 Shell_NotifyIcon(NIM_ADD,&data); M@?"t_e1  
 ShowWindow(SW_HIDE); /~}_hO$S  
 bTray=TRUE; @~jxG%y86  
} b?kPN:U#N/  
CKTrZxR"  
void CCaptureDlg::DeleteIcon() 2 X<nn  
{ 9y"TDo  
 NOTIFYICONDATA data; eX<K5K.B  
 data.cbSize=sizeof(NOTIFYICONDATA); DY><qk  
 data.hWnd=GetSafeHwnd(); k]I*:'178  
 data.uID=98; ItK  
 Shell_NotifyIcon(NIM_DELETE,&data); K[ ?R[  
 ShowWindow(SW_SHOW); B5Va%?Wg?H  
 SetForegroundWindow(); NyJnOw(  
 ShowWindow(SW_SHOWNORMAL); |vy]8?Ak  
 bTray=FALSE; 7b.U!Ju  
} 3.)_uo0;o  
PN\V[#nS  
void CCaptureDlg::OnChange() _hoAW8i  
{ w67x l  
 RegisterHotkey(); md6*c./Z  
} Tcs3>lJ}   
9kd.j@C  
BOOL CCaptureDlg::RegisterHotkey() 0^>E`/  
{ }'jV/  
 UpdateData(); %)IrXz>Zh  
 UCHAR mask=0; eH=c|m]!P  
 UCHAR key=0;  3Vu8F"  
 if(m_bControl) $f(agG]  
  mask|=4; &^ceOV0+  
 if(m_bAlt) "4[<]pq  
  mask|=2; Ao!=um5D J  
 if(m_bShift) ~\bHfiIDy  
  mask|=1; kt<@H11  
  key=Key_Table[m_Key.GetCurSel()]; j@g!R!7)  
 if(bRegistered){ l-=e62I{=|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /a%KS3>V*  
  bRegistered=FALSE; Lnx2xoNk  
 } ;7 "Y?*{  
 cMask=mask; Fs9W>*(  
 cKey=key; ^HoJ.oC/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c V(H<"I  
 return bRegistered; n@o  
} C!kbZTO[p"  
&u4Ve8#  
  四、小结 4i96UvkZ  
`L">"V`$Bj  
  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:
10+5=?,请输入中文答案:十五