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
  • 5043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: >&&xJ5  
  =vc5,  
  一、实现方法 '/H(,TM  
AVr!e   
  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: jVINc=o  
K*Jtyy}r  
#pragma data_seg("shareddata") K|G $s  
HHOOK hHook =NULL; //钩子句柄 X4$e2f  
UINT nHookCount =0; //挂接的程序数目 -"e}YN/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &XsLp&Do2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x3s^u~C)(w  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Wn^^Q5U#  
static int KeyCount =0; L)}V [j#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %jxuH+L   
#pragma data_seg() >D/~|`=p  
#& wgsGV8C  
  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。 ?Qig$  
M: "ci;*$  
  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: rl%Kn^JJ~  
ElXe=5L\#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6 b}feEh$!  
cKey,UCHAR cMask) V@S/!h+  
{ !7)ID7d  
 BOOL bAdded=FALSE; }BJ1#<  
 for(int index=0;index<MAX_KEY;index++){ 5Mr;6 ]I<  
  if(hCallWnd[index]==0){ {_Qxe1^g  
   hCallWnd[index]=hWnd; / D ]B  
   HotKey[index]=cKey; 3@] a#>  
   HotKeyMask[index]=cMask; \=7=>x_  
   bAdded=TRUE; pU ]{Z(  
   KeyCount++; ? sW`**j  
   break; %5*#c*)R  
  } > bF!Y]H  
 } <S$21NtM87  
 return bAdded; {0e{!v  
} ~It+|X=Kx  
//删除热键 %h"< IA S.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ({KAh?  
{ z4641q5'm  
 BOOL bRemoved=FALSE; p^rX.?X  
 for(int index=0;index<MAX_KEY;index++){ d;SRK @  
  if(hCallWnd[index]==hWnd){ %-/:ps  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t4/eB<fP  
    hCallWnd[index]=NULL; 5"am>$rh  
    HotKey[index]=0;  -C  ON  
    HotKeyMask[index]=0; X-$td~r  
    bRemoved=TRUE; )6E*Qz  
    KeyCount--; q "D L6 >j  
    break;  sGls^J)  
   } :EwA$`/  
  } %_MR.J+m2  
 } / JeqoM"x  
 return bRemoved; W<91m*  
} &PuJV +y  
s|r7DdI  
THgzT\_zq  
  DLL中的钩子函数如下: y]]Vp~R:[  
+Nbk\%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !otq X-  
{ HoE.//b  
 BOOL bProcessed=FALSE; R9/xC7l@  
 if(HC_ACTION==nCode) j' KobyX<  
 { hS{ *l9v7  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 eBTedSM?t  
   switch(wParam) y/I ~x+ y  
   {  q;../h]Ne  
    case VK_MENU: J+ZdZa}Ob  
     MaskBits&=~ALTBIT; 'lsq3!d.  
     break; e'Us(]ZO  
    case VK_CONTROL: [y[v]'  
     MaskBits&=~CTRLBIT; 0nz@O^*g(  
     break; bC>>^?U1m  
    case VK_SHIFT: pt%~,M _  
     MaskBits&=~SHIFTBIT;  +wW  
     break; XjZao<?u  
    default: //judge the key and send message BMWeD  
     break; B"8JFf}"q  
   } %[\x%m)  
   for(int index=0;index<MAX_KEY;index++){ Z*(! `,.bB  
    if(hCallWnd[index]==NULL) z!C4>,  
     continue; *<1x:PR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `V):V4!j),  
    { JJ9e{~0 I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x]><}! \<&  
     bProcessed=TRUE; 0/P-> n~  
    } W|rFl]~a  
   } =R;1vUio  
  } {9.~]dI|L  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,cy/fW  
   switch(wParam) iC|6roO!jk  
   { Ed&,[rC  
    case VK_MENU: Na 9l#  
     MaskBits|=ALTBIT; ZYR,8y  
     break; HvgK_'  
    case VK_CONTROL: lDPRn~[#\  
     MaskBits|=CTRLBIT; hW !@$Ph  
     break; }Q r0T  
    case VK_SHIFT: _l!U[{l*d  
     MaskBits|=SHIFTBIT; )-?uX.E{  
     break; w4fJ`,  
    default: //judge the key and send message oj(A`[  
     break; /zG-\eU  
   } v(@+6#&  
   for(int index=0;index<MAX_KEY;index++){ F `pyhc>1;  
    if(hCallWnd[index]==NULL) -=Eq/s u%  
     continue; 95?5=T F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hXQg=Sj  
    { ?^48Zq6wM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3@TG.)N4  
     bProcessed=TRUE; C*y6~AYN#  
    } f-v ND'@  
   } @t; O"q'|  
  } ?9zoQ[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  sx(l  
   for(int index=0;index<MAX_KEY;index++){ z^!A/a[[!  
    if(hCallWnd[index]==NULL) fyg~KF}  
     continue; &pMlt7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) snTJe[^d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H&yFSz}6a  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~b$z\|Y  
   } wO_pcNYZ8  
  } W:{PBb"x8  
 } 1_j<%1{sZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AYPf)K;%  
} @[>+Dzn[6  
x)#<.DX  
  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: <7FP"YU  
$;)noYo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M~z (a3@[V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3<)@ll  
$E`i qRB  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: !skb=B#  
^E<~zO=Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )0 n29  
{ {b-0_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) # McK46B z  
 { X$uz=)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Mdltzy=)L  
  SaveBmp(); w*6!?=jP  
  return FALSE; ,p*ntj{  
 } rtYb"-&  
 …… //其它处理及默认处理 TM/|K|_  
} iB}LnC:  
S4k^&$;  
qrM{b=  
  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。 Ft"&NtXeZZ  
MgH1d&R  
  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。 zqvRkMWcM  
vSYun I  
  二、编程步骤 @wEKCn|}o  
s;-78ejj7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; l?@MUsg+  
" g0-u(Y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; qUEd E`B  
"u Of~e"  
  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; JI+KS  
eHR&N.2  
  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; j h1bn  
x  tYV"  
  5、 添加代码,编译运行程序。 $K6?(x_  
$/<"Si&(  
三、程序代码 5I)~4.U|,m  
x^M5D+o  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0gv3v@QO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) j'#jnP*P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \'s$ZN$k  
#if _MSC_VER > 1000 X ]pR,\B  
#pragma once nCffBc  
#endif // _MSC_VER > 1000  e8XM=$@  
#ifndef __AFXWIN_H__ VW{aUgajO  
#error include 'stdafx.h' before including this file for PCH <4l.s  
#endif 'B:Z=0{>N  
#include "resource.h" // main symbols $ ,; ;u:-  
class CHookApp : public CWinApp ~{1/*&P  
{ NK  
 public: $tDCS  
  CHookApp(); koncWyW  
  // Overrides v2M"b?Q  
  // ClassWizard generated virtual function overrides =2.tu*!C  
  //{{AFX_VIRTUAL(CHookApp) zJnL<Q  
 public: )d770Xg+  
  virtual BOOL InitInstance(); 1EC-e|M.  
  virtual int ExitInstance(); `uIx/.L  
  //}}AFX_VIRTUAL pPiYPfs  
  //{{AFX_MSG(CHookApp) TZ&4  
  // NOTE - the ClassWizard will add and remove member functions here. ^MWEfPt  
  // DO NOT EDIT what you see in these blocks of generated code ! g{g`YvLu^  
  //}}AFX_MSG gZ`32fB%  
  DECLARE_MESSAGE_MAP() Gsds!z$  
}; BB2_J=wA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); * 1 |YLy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >zPO>.?h7T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K;<NBnH  
BOOL InitHotkey(); >u9id>+  
BOOL UnInit(); Ax5mP8S  
#endif ?r -\%_J_(  
N5q}::Odc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #Acon7R p  
#include "stdafx.h" ysSjc  
#include "hook.h" qy7hkq.uX  
#include <windowsx.h> fbh6Ls/  
#ifdef _DEBUG + >T7Q`64  
#define new DEBUG_NEW vh9kwJyT  
#undef THIS_FILE H$NP1^5!  
static char THIS_FILE[] = __FILE__; rmY,v  
#endif XysFwi  
#define MAX_KEY 100 bDciZ7[b  
#define CTRLBIT 0x04 2gQY8h8  
#define ALTBIT 0x02 V;>9&'Z3  
#define SHIFTBIT 0x01 JwN}Jm  
#pragma data_seg("shareddata") #d }0}7ue  
HHOOK hHook =NULL; nuf@}W>y  
UINT nHookCount =0; ^?$D.^g  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey & cM u/}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l 8O"w&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey E/"YId `A  
static int KeyCount =0; ~pHJ0g:t  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ez zTJ>  
#pragma data_seg() O{lIs_1.Z  
HINSTANCE hins; 8fJR{jD(s  
void VerifyWindow(); ~/^y.SsWM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /[\6oa  
//{{AFX_MSG_MAP(CHookApp) r+imn&FK8  
// NOTE - the ClassWizard will add and remove mapping macros here. g8%MOhg  
// DO NOT EDIT what you see in these blocks of generated code! 4mEzcwo'  
//}}AFX_MSG_MAP >X;xIyRL  
END_MESSAGE_MAP() 8q_1(& O  
(\Rwf}gyR  
CHookApp::CHookApp() R(M}0JRm  
{ IV)^;i  
 // TODO: add construction code here, bin6i2b  
 // Place all significant initialization in InitInstance ]*bAF^8i  
} GwgFi@itN  
k-{yu8*';  
CHookApp theApp; 2-B6IPeI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ShC_hi  
{ J y]FrSm^  
 BOOL bProcessed=FALSE; :~\LOKf  
 if(HC_ACTION==nCode) n?y'c^  
 { ^c/mj9M#C  
  if((lParam&0xc0000000)==0xc0000000){// Key up F{TC#J}I%'  
   switch(wParam) y<O@rD8iA  
   { WuBmdjZ  
    case VK_MENU: * <B)Z  
     MaskBits&=~ALTBIT; yr FZ~r@-  
     break; xCR; K]!  
    case VK_CONTROL: ]XmQ]Yit  
     MaskBits&=~CTRLBIT; VYL@RL'  
     break; 6P0y-%[Gk  
    case VK_SHIFT: Bj;\mUsk  
     MaskBits&=~SHIFTBIT; 2~vo+ng  
     break; Lf5%M|o.)  
    default: //judge the key and send message nVz5V%a!\q  
     break; uQeqnGp  
   } m,\i  
   for(int index=0;index<MAX_KEY;index++){ Zw2jezP@t  
    if(hCallWnd[index]==NULL) fp9rO}##  
     continue; IM@"AD52a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W;^Rx.W  
    { U5|B9%:&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G1kDM.L  
     bProcessed=TRUE; 9OPK4-  
    } &foD&  
   } K|`+C1!  
  } J2rvJ2l=t  
  else if((lParam&0xc000ffff)==1){ //Key down j%#?m2J}  
   switch(wParam) [m~b[ZwES  
   { uZ@-e|qto  
    case VK_MENU: ksTzXG8  
     MaskBits|=ALTBIT; {d| |q<.-  
     break; 7raSf&{&6b  
    case VK_CONTROL: E|Q{]&$;Z"  
     MaskBits|=CTRLBIT; ||R0U@F,  
     break; /rqqC(1  
    case VK_SHIFT: 3 t/ R2M  
     MaskBits|=SHIFTBIT; xC<R:"Mn  
     break; |a%B|CX  
    default: //judge the key and send message wHA/b.jH  
     break; tJff+n>  
   } 'P+f|d[  
   for(int index=0;index<MAX_KEY;index++) I4rV5;f H4  
   { =.DTR5(_h  
    if(hCallWnd[index]==NULL) l+t #"3  
     continue; JRD8Lz]Q3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ud$Q0m&  
    { ])eOa%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DG3[^B  
     bProcessed=TRUE; cvhlRI%6  
    } ^)|&|  
   } A_@I_V$  
  } 3 sl=>;-  
  if(!bProcessed){ >J.Qm0TY(  
   for(int index=0;index<MAX_KEY;index++){ |Mt&p#y  
    if(hCallWnd[index]==NULL) \xF;{}v  
     continue; :=y0'f V(@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kzMa+(fu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YbzM6u2  
   } j+$ M?Z^  
  } "<qEXX  
 } b9`iZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o\&~CW~@~  
} `(3SfQ-  
q1STRYb   
BOOL InitHotkey() <]~ZPk[  
{ Og=[4?Kpk  
 if(hHook!=NULL){ ;xhOj<:  
  nHookCount++; `ovgWv  
  return TRUE; \N?7WQ  
 } 5qC:yI  
 else JfbKf~g  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); L1rwIOgq^  
  if(hHook!=NULL) `{DG;J03[  
   nHookCount++; 6nc0=~='$  
  return (hHook!=NULL); ^/k ,  
} z9 O~W5-U  
BOOL UnInit() NaF(\j  
{ {H+?z<BF<  
 if(nHookCount>1){ #Gd7M3  
  nHookCount--; B=r0?%DX"1  
  return TRUE; n3'dLJH|  
 } lw s(/a*c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); {$0&R$v3  
 if(unhooked==TRUE){ sllzno2bU  
  nHookCount=0; ]dq5hkjpU  
  hHook=NULL; 8-ZUS|7B  
 } @^'$r&M  
 return unhooked; wDMjk2 YN  
} 2yvVeo&3  
#\LZ;&T'N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Nl { 7  
{ U~wjR"='  
 BOOL bAdded=FALSE; x )3~il5  
 for(int index=0;index<MAX_KEY;index++){ j AQU~Ol_  
  if(hCallWnd[index]==0){ C-Ig_Nc  
   hCallWnd[index]=hWnd; 7u::5W-q  
   HotKey[index]=cKey; eHUg-\dy  
   HotKeyMask[index]=cMask; 4#_$@ r  
   bAdded=TRUE; R5~gH6K|  
   KeyCount++; '#A:.P  
   break;  #I;D  
  } qcYNtEs*c  
 } y+A{Y  
 return bAdded; Rjq a_hxrS  
} %J _ymJ'pd  
i|S: s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p0Gk j-  
{ +RS$5NLH  
 BOOL bRemoved=FALSE; 5KJ%]B(H2  
 for(int index=0;index<MAX_KEY;index++){ e=7W 7^"_  
  if(hCallWnd[index]==hWnd){  &+G; R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t7bqk!6hM\  
    hCallWnd[index]=NULL; SRItE\"Xe  
    HotKey[index]=0; ei|cD[ NY  
    HotKeyMask[index]=0; TY~Vi OC  
    bRemoved=TRUE; 3b@VY'P  
    KeyCount--; };r|}v !~_  
    break; 7TpRCq#  
   } (N0sE"_~I5  
  } O:e#!C8^  
 } [x5mPjgw  
 return bRemoved; w4,]2Ccn.  
} /&(1JqzlB  
e #M iaX  
void VerifyWindow() J(e7{aRJ9  
{ iDw.i"b  
 for(int i=0;i<MAX_KEY;i++){ &\^rQi/tf  
  if(hCallWnd!=NULL){ U-g9C.  
   if(!IsWindow(hCallWnd)){ yUe+":7k.  
    hCallWnd=NULL; =Dk7RKoHF  
    HotKey=0; @\jQoaLT$_  
    HotKeyMask=0; _=EZ `!%  
    KeyCount--; h>klTPM>  
   } @VK6JjIq  
  } Vo M6  
 } "r..  
} OJpj}R  
'E-FO_N  
BOOL CHookApp::InitInstance() ^C7C$TZS  
{ G6Nb{m  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \ha-"Aqze3  
 hins=AfxGetInstanceHandle(); )7Ixz1I9g  
 InitHotkey(); W5Zqgsy($F  
 return CWinApp::InitInstance(); Xa,\EEmQ  
} Kam]Mn'  
Q'K$L9q  
int CHookApp::ExitInstance() Ly>OLI0x_  
{ j5^-.sEEw  
 VerifyWindow(); b#a@ rh  
 UnInit(); ,r`UBQ}?  
 return CWinApp::ExitInstance(); X;VQEDMPU  
} OH6n^WKY  
.6m_>Y6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file f{ ^:3"i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  iSiDSeW8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rwgsXS8W6  
#if _MSC_VER > 1000 ,Sg33N ?  
#pragma once opD-vDa h  
#endif // _MSC_VER > 1000 bX2"89{  
L/i(KF{  
class CCaptureDlg : public CDialog ARWZ; GX  
{ * t!r@k  
 // Construction vv+J0f^  
 public: wf9z"B  
  BOOL bTray; +EkW>$  
  BOOL bRegistered; sV2iITF p  
  BOOL RegisterHotkey();  ;:OsSq&  
  UCHAR cKey; FN?3XNp.  
  UCHAR cMask; `R+,1"5=  
  void DeleteIcon(); [@G`Afaf  
  void AddIcon(); " U8S81'  
  UINT nCount; ^npJUa  
  void SaveBmp(); }C,O   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;Z9IZ~  
  // Dialog Data B4Lx{u no  
  //{{AFX_DATA(CCaptureDlg) C-w5KW  
  enum { IDD = IDD_CAPTURE_DIALOG }; mQr0sI,o]  
  CComboBox m_Key; 8\# ^k#X  
  BOOL m_bControl; 2d`c!  
  BOOL m_bAlt; @;Y~frT  
  BOOL m_bShift; Hg+ F^2<y  
  CString m_Path; /S~m)$vu  
  CString m_Number; %Q~CB7ILK  
  //}}AFX_DATA j O8k6<l  
  // ClassWizard generated virtual function overrides Lgi[u"Du  
  //{{AFX_VIRTUAL(CCaptureDlg) _~M^ uW^l  
 public: +S9PML){h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8omC%a}9m  
 protected: A 5nO=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wa:0X)KC?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Nfn(Xn*J-  
  //}}AFX_VIRTUAL Ik~1:D]f  
  // Implementation Fn+ ?u  
 protected: v}[dnG  
  HICON m_hIcon; &leK}je [  
  // Generated message map functions ,}J_:\j  
  //{{AFX_MSG(CCaptureDlg) euQ.ArF  
  virtual BOOL OnInitDialog(); e:-8k_0|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q SD9Pue  
  afx_msg void OnPaint(); =k{`oO~:9+  
  afx_msg HCURSOR OnQueryDragIcon(); &y\sL"YL!  
  virtual void OnCancel(); s'u(B]E  
  afx_msg void OnAbout(); E\th%q,mG  
  afx_msg void OnBrowse(); s 3r=mp{  
  afx_msg void OnChange(); 4c159wsnQ  
 //}}AFX_MSG RU&_j* U  
 DECLARE_MESSAGE_MAP() T ):SGW  
}; Uyx&E?SlEq  
#endif zp4W'8  
*b)Q5dw@1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x0Z5zV9  
#include "stdafx.h" *#&*`iJ(  
#include "Capture.h" YZE.@Rz  
#include "CaptureDlg.h" ~?U*6P)o  
#include <windowsx.h> %*W<vu>H  
#pragma comment(lib,"hook.lib") 50~K,Jx6B  
#ifdef _DEBUG ^gYD*K!*  
#define new DEBUG_NEW CxF-Z7 '  
#undef THIS_FILE gEJi[E@  
static char THIS_FILE[] = __FILE__; _[K#O,D,  
#endif z`U Ukl}T  
#define IDM_SHELL WM_USER+1 c`G&KCw)d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '2nqHX D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i8PuC^]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; N1x@-/xa|  
class CAboutDlg : public CDialog d,cN(  
{ '&yeQ   
 public: %XTA;lrz  
  CAboutDlg(); <@uOCRb V  
  // Dialog Data la^ DjHA$  
  //{{AFX_DATA(CAboutDlg) vkcRm`.  
  enum { IDD = IDD_ABOUTBOX }; #A<P6zJXR  
  //}}AFX_DATA 0q6I;$H  
  // ClassWizard generated virtual function overrides Ee2c5C!|C  
  //{{AFX_VIRTUAL(CAboutDlg) RBGX_v?  
 protected: Of[;Qn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tE"Si<[]H$  
  //}}AFX_VIRTUAL .$rC0<G[K  
  // Implementation ra6o>lI(,  
 protected: Vpp&|n9^  
  //{{AFX_MSG(CAboutDlg) Y+-xvx :  
  //}}AFX_MSG SO?8%s(   
  DECLARE_MESSAGE_MAP() m{%t?w$Au  
}; ;4#D,zlO^  
LE=k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |m G7XL,  
{ 0ejdKdYN  
 //{{AFX_DATA_INIT(CAboutDlg) 0 P|&Pq&IH  
 //}}AFX_DATA_INIT buMq F-j  
} Q^_/By@  
C"w {\ &R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ru\_dr2yI}  
{ kQv*eZ~  
 CDialog::DoDataExchange(pDX); U 4,2br>  
 //{{AFX_DATA_MAP(CAboutDlg) TMVryb  
 //}}AFX_DATA_MAP = +Xc4a  
} KEr\nKT1  
$u9]yiY.{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) s0W2?!>)  
 //{{AFX_MSG_MAP(CAboutDlg) O#kq^C}  
 // No message handlers =VP=|g  
 //}}AFX_MSG_MAP adO&_NR  
END_MESSAGE_MAP() 4)1;0,tlG  
/^7iZ|>:M:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jE/oA<^  
: CDialog(CCaptureDlg::IDD, pParent) f [o%hCS  
{ *r,b=8|  
 //{{AFX_DATA_INIT(CCaptureDlg) \f Lvw  
  m_bControl = FALSE; r/:%}(7;  
  m_bAlt = FALSE; +cB&Mi5  
  m_bShift = FALSE; >cR)?P/o  
  m_Path = _T("c:\\"); 3OqX/z,  
  m_Number = _T("0 picture captured."); PX,rWkOce  
  nCount=0; LM l~yqM  
  bRegistered=FALSE; =y]$0nh  
  bTray=FALSE; SZ!=`a]  
 //}}AFX_DATA_INIT g!J0L7 i|  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /Z%>ArAx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I!: z,t<  
} NCS!:d:Ry  
)j&"%[2F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "^CXY3v  
{ bE\,}DTy  
 CDialog::DoDataExchange(pDX); +: Ge_-  
 //{{AFX_DATA_MAP(CCaptureDlg) lE#m]D  
  DDX_Control(pDX, IDC_KEY, m_Key); T1Ta?b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *~VxC{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 40P) 4w  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4FMF|U  
  DDX_Text(pDX, IDC_PATH, m_Path); 6`H.%zM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xi'>mIT  
 //}}AFX_DATA_MAP ^4$ 'KIq  
} 6XV<? 9q  
W?RE'QV8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >yK0iK{  
//{{AFX_MSG_MAP(CCaptureDlg) =tdSq"jh  
 ON_WM_SYSCOMMAND() m}Y0xV9  
 ON_WM_PAINT() ` $5UHa2/  
 ON_WM_QUERYDRAGICON() \FzM4-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 15H6:_+=0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :14i?4F d  
 ON_BN_CLICKED(ID_CHANGE, OnChange) L2z2}U=<  
//}}AFX_MSG_MAP -V<t-}h.  
END_MESSAGE_MAP() "4xfrlOc  
P9Q2gVGAO{  
BOOL CCaptureDlg::OnInitDialog() U8QX46Br  
{ V6a``i]  
 CDialog::OnInitDialog(); Q5+_u/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <,%:   
 ASSERT(IDM_ABOUTBOX < 0xF000); `iG,H[t+j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); VM=+afY5M  
 if (pSysMenu != NULL) oR#:Nt X@  
 { K`KLC.j  
  CString strAboutMenu; _7)F ?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %b!-~ Y.  
  if (!strAboutMenu.IsEmpty()) 2z0n<`  
  { udqS'g&  
   pSysMenu->AppendMenu(MF_SEPARATOR); Q=cQLf;/'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L\aBc}  
  } v:_B kHN'  
 } l:(Rb-Wy  
 SetIcon(m_hIcon, TRUE); // Set big icon iZ,YxN<R  
 SetIcon(m_hIcon, FALSE); // Set small icon 6tjcAsV  
 m_Key.SetCurSel(0); :os z  
 RegisterHotkey(); !dcwq;Ea  
 CMenu* pMenu=GetSystemMenu(FALSE); j ) vlM+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u:gtOjk2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e]>ori 8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h5zVGr  
 return TRUE; // return TRUE unless you set the focus to a control t!;/Z6\Pb  
} R MYP"  
-e@!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $ChK]v 6C  
{ }-<zWI {p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >`T5]_a  
 { ]> !<G8 =N  
  CAboutDlg dlgAbout; h1"zV6U  
  dlgAbout.DoModal(); J{"kw1Lu  
 } b!>\2DlyJ  
 else .w? .ib(  
 { s4= "kT]  
  CDialog::OnSysCommand(nID, lParam); \k8rxW  
 } keAcKhj  
} =H5\$&xj4.  
alFjc.~}  
void CCaptureDlg::OnPaint() gQWd&)'muf  
{ D%/8{b:  
 if (IsIconic()) +SXIZ`  
 { \>/M .2  
  CPaintDC dc(this); // device context for painting HRa@  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); rp34?/Nz  
  // Center icon in client rectangle &lc8G  
  int cxIcon = GetSystemMetrics(SM_CXICON); L):qu  
  int cyIcon = GetSystemMetrics(SM_CYICON); LxN*)[Wb  
  CRect rect; 4/> Our 5  
  GetClientRect(&rect); 2s ,8R  
  int x = (rect.Width() - cxIcon + 1) / 2; $So%d9k  
  int y = (rect.Height() - cyIcon + 1) / 2; +{`yeZ9S  
  // Draw the icon w=b(X q+:  
  dc.DrawIcon(x, y, m_hIcon); XAOak$(j  
 } @Cq? :o<  
 else L):U"M>]=  
 { =v6*|  
  CDialog::OnPaint(); Lm)\Z P+W  
 } 5MxL*DB=b  
} @$@mqHI}  
%,*$D} H  
HCURSOR CCaptureDlg::OnQueryDragIcon() {==pZpyyh  
{ =(r* 5vd  
 return (HCURSOR) m_hIcon; $6f\uuTU2"  
} D$k8^Vs  
vFmJ;J  
void CCaptureDlg::OnCancel() vxlOh.a|/L  
{ wzcai 0y*  
 if(bTray) USML~]G z  
  DeleteIcon(); v[k5.\No  
  CDialog::OnCancel(); ph:3|d  
} Mio>{%/  
g9h(sLSF  
void CCaptureDlg::OnAbout() 25{ uz  
{ **_&i!dtL  
 CAboutDlg dlg; }2>"<)  
 dlg.DoModal(); (g8*d^u#PO  
} 2h~-  
]5CNk+`'  
void CCaptureDlg::OnBrowse() @ CsV]97`  
{ ,lN5,zI=S  
 CString str; EYS>0Y  
 BROWSEINFO bi; ]L_w$ev'  
 char name[MAX_PATH]; pR o s{Uq"  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `|e!Kq?#Q  
 bi.hwndOwner=GetSafeHwnd(); IfdI|ya  
 bi.pszDisplayName=name; d 4{FDqto  
 bi.lpszTitle="Select folder"; BuQ|~V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M7}Q=q\9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); |!z2oO  
 if(idl==NULL) cL7g}$W $  
  return; aC=['a>)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~Vh=5J~  
 str.ReleaseBuffer(); my\&hCE  
 m_Path=str; Xh3;   
 if(str.GetAt(str.GetLength()-1)!='\\') .#6MQJ]OH  
  m_Path+="\\"; RNJ FSD.  
 UpdateData(FALSE); Va<H U:<  
} jRZ%}KX  
)6oGF>o>  
void CCaptureDlg::SaveBmp() 5a`%)K  
{ |WQ9a' '  
 CDC dc; O_,O,1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &]p}+{ (>  
 CBitmap bm; ".2K9j7$  
 int Width=GetSystemMetrics(SM_CXSCREEN); f_mhD dq  
 int Height=GetSystemMetrics(SM_CYSCREEN); .QWhK|(.!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j.?:Gaab?#  
 CDC tdc; w_-+o^  
 tdc.CreateCompatibleDC(&dc); 1TJ0D_,  
 CBitmap*pOld=tdc.SelectObject(&bm); s&PM,BFf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |w&~g9   
 tdc.SelectObject(pOld); cSD{$B:  
 BITMAP btm; 93%{scrm  
 bm.GetBitmap(&btm); :KE/!]z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; C*~aSl7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); HD`>-E#  
 BITMAPINFOHEADER bih; 5mB]N%rfW%  
 bih.biBitCount=btm.bmBitsPixel; j+ ::y) $  
 bih.biClrImportant=0; M].8HwC+  
 bih.biClrUsed=0; }<m{~32M  
 bih.biCompression=0; ~hX-u8Ul'N  
 bih.biHeight=btm.bmHeight; ; 2`sN   
 bih.biPlanes=1; }7/e8 O2  
 bih.biSize=sizeof(BITMAPINFOHEADER); UGKaOol.  
 bih.biSizeImage=size; ?bX  
 bih.biWidth=btm.bmWidth; }6m?d!m  
 bih.biXPelsPerMeter=0; m\0cE1fir  
 bih.biYPelsPerMeter=0;  mw$Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .J.vC1 4gi  
 static int filecount=0; b[^{)$(  
 CString name; 6 vs3O  
 name.Format("pict%04d.bmp",filecount++); Utl t<  
 name=m_Path+name; loOOmHhJ&  
 BITMAPFILEHEADER bfh; P_4DGW  
 bfh.bfReserved1=bfh.bfReserved2=0; L ubrn"128  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cnNOZ$)  
 bfh.bfSize=54+size; UPh=+s #Q  
 bfh.bfOffBits=54; 4iX-(ir,  
 CFile bf; je%M AgW`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ P~7.sM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); H[&@}v,L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j~av\SCU*  
  bf.WriteHuge(lpData,size); VV3}]GjC  
  bf.Close(); QTJu7^ O9  
  nCount++; JJk#,AP  
 } `u'dh{,gE  
 GlobalFreePtr(lpData); D_D,t8_Y  
 if(nCount==1) /XpSe<3  
  m_Number.Format("%d picture captured.",nCount); C3;[e0.1b  
 else UZxmh sv  
  m_Number.Format("%d pictures captured.",nCount); GrI&?=S^  
  UpdateData(FALSE); ocA]M=3~k  
} "~+.Af  
)C]x?R([m  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V0i9DK|!  
{ G?)vWM`j  
 if(pMsg -> message == WM_KEYDOWN) .Ao0;:;(2-  
 { K b(9)Re  
  if(pMsg -> wParam == VK_ESCAPE) ';YgG<u  
   return TRUE; <4X?EYaTq  
  if(pMsg -> wParam == VK_RETURN) .XH8YT42  
   return TRUE; G2Qjoe`Uc  
 } DZ`k[Z.VZ  
 return CDialog::PreTranslateMessage(pMsg); =Viy^ieN$  
} F8mC?fbK9  
Yv\!vW7I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TUTe9;)  
{ |r =DBd3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )2j:z#'>  
  SaveBmp(); bKz{wm%  
  return FALSE; S7sb7c'4 k  
} \9m*(_Qf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9%,;XQ  
 CMenu pop; &9B_/m3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @)0 Y~A )  
 CMenu*pMenu=pop.GetSubMenu(0); @6MAX"  
 pMenu->SetDefaultItem(ID_EXITICON); %v=!'?VT  
 CPoint pt; #+jUhxq  
 GetCursorPos(&pt);  H!eh J$[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -Zy)5NB-tZ  
 if(id==ID_EXITICON) kK[duW =6  
  DeleteIcon(); S!dHNA:iU  
 else if(id==ID_EXIT) "kSwa16O  
  OnCancel(); d<T%`:s<  
 return FALSE; \lr/;-zP  
} __\P`S_  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rw u3Nb  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *o4%ul\3Y|  
 AddIcon(); J_"3UZ~&  
 return res; {BOLP E-  
} 3wt  
(2txM"Dja  
void CCaptureDlg::AddIcon() rK=6]j(K  
{ Ye |G44z  
 NOTIFYICONDATA data; Q<=Y  
 data.cbSize=sizeof(NOTIFYICONDATA); O% $O(l  
 CString tip; :JV\){P  
 tip.LoadString(IDS_ICONTIP); KTmaglgp  
 data.hIcon=GetIcon(0); CT"Fk'B'  
 data.hWnd=GetSafeHwnd(); WYO\'W  
 strcpy(data.szTip,tip); OgMI  
 data.uCallbackMessage=IDM_SHELL; i?>Hr|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Yn<)k_kp  
 data.uID=98; qei$<j'b  
 Shell_NotifyIcon(NIM_ADD,&data); }98-5'u.X  
 ShowWindow(SW_HIDE); SMO*({/  
 bTray=TRUE; $ KQ,}I  
} Auac>')&Q  
xqWj|jA  
void CCaptureDlg::DeleteIcon() i^/54  
{ sR79 K1*j  
 NOTIFYICONDATA data; 6VR[)T%  
 data.cbSize=sizeof(NOTIFYICONDATA); fM":f| G  
 data.hWnd=GetSafeHwnd(); P|}\/}{`  
 data.uID=98; iZTa>@   
 Shell_NotifyIcon(NIM_DELETE,&data); yYX :huw  
 ShowWindow(SW_SHOW); jT^!J+?6K+  
 SetForegroundWindow(); 0xP:9rm  
 ShowWindow(SW_SHOWNORMAL); fN[n>%)VO<  
 bTray=FALSE; {j@+h%sF>+  
} 9ECS,r*B  
jsm0kz  
void CCaptureDlg::OnChange() P9yw&A  
{ V/-MIH7SF  
 RegisterHotkey(); -1mvhR~  
} d}% (jJ(I  
`o-*Tr  
BOOL CCaptureDlg::RegisterHotkey() lU$X4JBzS  
{ ^x3EotQ\  
 UpdateData(); IwRQL%  
 UCHAR mask=0; 1v]t!}W:6  
 UCHAR key=0; NbDda/7ki  
 if(m_bControl) yWuIu>VJ  
  mask|=4; 6Ct0hk4  
 if(m_bAlt) G"Pj6QUva  
  mask|=2; u}CG>^0C  
 if(m_bShift) :uvc\|:s  
  mask|=1; <Kp+&(l,l  
  key=Key_Table[m_Key.GetCurSel()]; ~XQ$aRl&  
 if(bRegistered){ N cM3P G  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LUul7y'"  
  bRegistered=FALSE; Fwv\pJ}$  
 } y:9?P~  
 cMask=mask; nKu(XgFv  
 cKey=key; %8<2>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }200g_^  
 return bRegistered; #M:B3C!ouY  
} 1^sbT[%R  
/j %_t  
  四、小结 d+1x*`U|  
Hdna{@~  
  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
如果您在写长篇帖子又不马上发表,建议存为草稿
认证码:
验证问题:
10+5=?,请输入中文答案:十五