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
  • 5894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: ^Q>*f/.KN  
  `1@[uWl  
  一、实现方法 >G2-kL_  
D 8Rmxq!  
  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: 8 36m5/kH[  
RHVv}N0  
#pragma data_seg("shareddata") 0)5Sx /5'  
HHOOK hHook =NULL; //钩子句柄 Ba0D"2CgY  
UINT nHookCount =0; //挂接的程序数目 M[u3]dN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Mqp68%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (N|xDl &;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }dJ ~Iy  
static int KeyCount =0; ; ZV^e  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (H+[^(3d2  
#pragma data_seg() v6?\65w,|  
[!? ,TGM}^  
  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。 0t?<6-3`/  
Z(mn U;9{v  
  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: 5,BkwAr+6[  
dY@Tt&k8E  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR YwWTv  
cKey,UCHAR cMask) ' ,`4 U F  
{ NoZ4['NI\  
 BOOL bAdded=FALSE; FR^wDm$  
 for(int index=0;index<MAX_KEY;index++){ 9~'Ip7X,!  
  if(hCallWnd[index]==0){ OCO,-(  
   hCallWnd[index]=hWnd; YCBML!L  
   HotKey[index]=cKey; %GCd?cFF  
   HotKeyMask[index]=cMask; Qfu*F}  
   bAdded=TRUE; `Mn{bd  
   KeyCount++; w^E]N  
   break; {C0^D*U:  
  } u$,Wyi )L  
 } T.P Z}4  
 return bAdded; `[` *@O(y  
} F"f}vl  
//删除热键 Q0uO49sg  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h9w^7MbO  
{ V$-~%7@>;9  
 BOOL bRemoved=FALSE; 94p:|5@  
 for(int index=0;index<MAX_KEY;index++){ veX"CY`hn  
  if(hCallWnd[index]==hWnd){ e0~sUVYf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %eutfM-?6  
    hCallWnd[index]=NULL; wzDk{4U  
    HotKey[index]=0; :Er^"9'A2  
    HotKeyMask[index]=0; u6iU[5  
    bRemoved=TRUE; %EJ\|@N:  
    KeyCount--; Uxk[O  
    break; x!"SD3r=4>  
   } jsNH`"  
  } d4y9AE@k  
 } LL= Z$U $  
 return bRemoved;  /i-xX*  
} #hD}S~  
M1/M}~  
~|y^\U@  
  DLL中的钩子函数如下: ? fbgU  
ZR;8r Z](  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -y&v9OC2-  
{ b)on A|  
 BOOL bProcessed=FALSE; N|!MO{sB  
 if(HC_ACTION==nCode) Pl rkgS0J  
 { K0EY<Ltq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *#&k+{a^2  
   switch(wParam) d5@X#3Hd  
   {  +Dx1/I  
    case VK_MENU: Vs#"SpH{'  
     MaskBits&=~ALTBIT; fm(mO%  
     break; Vq3gceo'0A  
    case VK_CONTROL: sU) TXL'_!  
     MaskBits&=~CTRLBIT; ?S (im  
     break; ~7dM!g{W  
    case VK_SHIFT: A}t%;V2  
     MaskBits&=~SHIFTBIT; f4]N0  
     break; >5)<Uv$  
    default: //judge the key and send message Bk?8 zYp  
     break; a q3~!T;W  
   } ,Bisu:v6FW  
   for(int index=0;index<MAX_KEY;index++){  !M  
    if(hCallWnd[index]==NULL) T vrk^!  
     continue; ShQ|{P9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &&[zT/]P  
    { \7pipde  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 95=g Y  
     bProcessed=TRUE; +7,8w  
    } 1EVfowIl  
   } )uZoH 8?  
  }  %BUEX  
  else if((lParam&0xc000ffff)==1){ //有键按下 >~_J q|KBB  
   switch(wParam) g>so R&*  
   { Q"40#RFA  
    case VK_MENU: >lrhHU  
     MaskBits|=ALTBIT; $@_{p*q  
     break; P?kx  
    case VK_CONTROL: /Rj#sxtdw  
     MaskBits|=CTRLBIT; XAe\s`  
     break; m6^ 5S  
    case VK_SHIFT: z v>Oh#  
     MaskBits|=SHIFTBIT; ~W<CE_/]k  
     break; 2 nv[1@M  
    default: //judge the key and send message tJNIr5o  
     break; h4_ b!E@  
   } YTK^ijmU6x  
   for(int index=0;index<MAX_KEY;index++){ owvS/"@  
    if(hCallWnd[index]==NULL) +Mk#9 r  
     continue; mzWP8Hlw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N2BI_,hI1  
    { 3X;{vO\a1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K/txD20 O|  
     bProcessed=TRUE; 4WC9US-k  
    } `5q ;ssu  
   } re^Hc(8M  
  } y` yZ R _  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 aBhV3Fd[B  
   for(int index=0;index<MAX_KEY;index++){ iib  
    if(hCallWnd[index]==NULL) T>A{ qu  
     continue; qi(*ty  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) iXFP5a>|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9'nH2,_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [ %}u=}@  
   } j?6X1cMq  
  } glE^t6)  
 } +H_MV=A^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~>Kq<]3~  
} G,XPT,:%  
!lTda<;]  
  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: eS'yGY0b  
kkS~4?- *  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); maNW{"1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -)jax  
+/rH(Ni  
  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: ~6aCfbu%V  
\K iwUz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nwA8ALhE  
{ x;LzG t:w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) g5Z#xszj+  
 { n6MM5h/#r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 T6#CK  
  SaveBmp(); w%y\dIeI'  
  return FALSE; y "w|g~x]c  
 } amWD-0V  
 …… //其它处理及默认处理 \.uc06  
} HYK!}&  
5fJ[}~  
|Ic`,>XM  
  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'YE9E  
&?,6~qm[  
  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。 ;CHi\+` 5  
k]A8% z  
  二、编程步骤 S4^N^lQ]  
&HW1mNF9  
  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"; S6d`ioi-  
69K{+|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; errH>D~  
DZS]AC*  
  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; a:, y Z  
`d]IX^;  
  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; H*^\h?s  
=sJ _yq0#R  
  5、 添加代码,编译运行程序。 -]uUYe c  
j@gMb iu  
三、程序代码 $~0Q@):  
RyJ 1mAC  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +  @9.$6N  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) j%u-dr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dy__e^qi  
#if _MSC_VER > 1000 [#Lc]$  
#pragma once )tHaB,  
#endif // _MSC_VER > 1000 2T@GA 1G  
#ifndef __AFXWIN_H__ im7nJQ^H$q  
#error include 'stdafx.h' before including this file for PCH 1n5(S<T  
#endif M->*{D@a  
#include "resource.h" // main symbols 1"7Sy3  
class CHookApp : public CWinApp Migd(uw'  
{ <ljI;xE  
 public: W7"{r)7  
  CHookApp(); =gfI!w  
  // Overrides v2r&('pV  
  // ClassWizard generated virtual function overrides VErv;GyV  
  //{{AFX_VIRTUAL(CHookApp) 7!,YNy%  
 public: t^]$!H  
  virtual BOOL InitInstance(); R[z`:1lo  
  virtual int ExitInstance(); b`yZ|j'ikd  
  //}}AFX_VIRTUAL Jd\apBIf  
  //{{AFX_MSG(CHookApp) _lzyMEdr  
  // NOTE - the ClassWizard will add and remove member functions here. SG}V[Glk  
  // DO NOT EDIT what you see in these blocks of generated code ! 5uq3\a  
  //}}AFX_MSG ~DRmON5 M  
  DECLARE_MESSAGE_MAP() |@,|F:h<M  
}; t?o ,RN:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ? J} r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CT0l!J~5m~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g  %K>  
BOOL InitHotkey(); J q{7R  
BOOL UnInit(); PB%-9C0  
#endif M/x>51<  
3lV^B[$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. izh<I0  
#include "stdafx.h" &g2 Eptx#  
#include "hook.h" [I4ege>  
#include <windowsx.h> {G <kA(Lm  
#ifdef _DEBUG LjL[V'JL  
#define new DEBUG_NEW go+Q~NV   
#undef THIS_FILE 2G$SpfeIu  
static char THIS_FILE[] = __FILE__; ZmOfEg|h\  
#endif .B#l5pfvP  
#define MAX_KEY 100 gP+fN$5'd  
#define CTRLBIT 0x04 iU6Gp-<M ,  
#define ALTBIT 0x02 VMoSLFp^R  
#define SHIFTBIT 0x01 ~|wbP6</:-  
#pragma data_seg("shareddata") hOhS)  
HHOOK hHook =NULL; ~Lc066bLeq  
UINT nHookCount =0; =^H4Yck/5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Bgmn2-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT R/"x}B1d  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey P0 `Mdk371  
static int KeyCount =0; Z|RY2P>E  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift iH^z:%dP  
#pragma data_seg() {'16:dTJ  
HINSTANCE hins; 1-.~7yC  
void VerifyWindow(); EyY.KxCB  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) fDx9iHGv  
//{{AFX_MSG_MAP(CHookApp) eT2*W$  
// NOTE - the ClassWizard will add and remove mapping macros here. 8w({\=  
// DO NOT EDIT what you see in these blocks of generated code! |yo\R{&6  
//}}AFX_MSG_MAP j5@:a  
END_MESSAGE_MAP() W2uOR{ '?  
:!zl^J;  
CHookApp::CHookApp() DWdW,xG  
{ !x'/9^i~v  
 // TODO: add construction code here, XD"_Iq!  
 // Place all significant initialization in InitInstance 02BuX]_0g  
} r,_?F7  
RmZ]" `  
CHookApp theApp; a1Qv@p^._b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 86 W0rS[5  
{ A<;SnXm  
 BOOL bProcessed=FALSE; +**!@uY  
 if(HC_ACTION==nCode) zSb PW 6U  
 { UwC=1g U  
  if((lParam&0xc0000000)==0xc0000000){// Key up }B~If}7  
   switch(wParam) iX3HtIBj'  
   { ws^4?O  
    case VK_MENU: i*CZV|t US  
     MaskBits&=~ALTBIT; Ie%EH  
     break; /rSH"$  
    case VK_CONTROL: 1{P'7IEj  
     MaskBits&=~CTRLBIT; ? R>h `  
     break; >ooZj9:'  
    case VK_SHIFT: VE8;sGaJ  
     MaskBits&=~SHIFTBIT; Zdn~`Q{  
     break; Y3O#Q)-j$  
    default: //judge the key and send message 4 {9B9={  
     break; %Z*sU/^  
   } ur$l Z0  
   for(int index=0;index<MAX_KEY;index++){ B-l'vVx  
    if(hCallWnd[index]==NULL) H<1WbM:w  
     continue; >|;aIa@9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @}kv-*  
    { (dv]=5""  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MMj9{ou  
     bProcessed=TRUE; tr7<]Hm:  
    } vv=VRhwF  
   } 1T[et-  
  } (64yg  
  else if((lParam&0xc000ffff)==1){ //Key down Zv#Ll@v  
   switch(wParam) }3?n~s\)6f  
   { t#2(j1  
    case VK_MENU: $1v&azM.  
     MaskBits|=ALTBIT; 6&/T@LQYrh  
     break; HbW0wuI  
    case VK_CONTROL: G\(|N9^:  
     MaskBits|=CTRLBIT; r\/+Oa'  
     break; %HJK;   
    case VK_SHIFT: :>=\.\  
     MaskBits|=SHIFTBIT; \eFR(gO+  
     break; 4t)/  
    default: //judge the key and send message H *)NLp  
     break; pxa(  
   } F >rH^F  
   for(int index=0;index<MAX_KEY;index++) _F`lq_C  
   { MNV % =G  
    if(hCallWnd[index]==NULL) YD7Oao4:o  
     continue; &#iTQD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^U!0-y  
    { 6AhM=C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); '  <=+;q  
     bProcessed=TRUE; r3PT1'P?L  
    } Nal9M[]c  
   } J Px~VnE%%  
  } tdu$pC6  
  if(!bProcessed){ ){b@}13cF  
   for(int index=0;index<MAX_KEY;index++){ %ALwz[~]  
    if(hCallWnd[index]==NULL) [)TRTxFb  
     continue; FIsyiSY<j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BSVxN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); - RU=z!{  
   } ^t#&@-'(d  
  } Uw7h=UQh  
 } IqoR7ajA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); uu>Pkfo  
} Qr{E[6  
<Pi|J-Y  
BOOL InitHotkey() #%h-[/  
{ H|HYo\@F#  
 if(hHook!=NULL){ |mw.qI|  
  nHookCount++; s|y "WDyx5  
  return TRUE; BNs@n"k  
 } jIyB  
 else #*UN >X  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @W"KVPd  
  if(hHook!=NULL) I<6P;  
   nHookCount++;  UWo]s.  
  return (hHook!=NULL); LF& z  
} B e0ND2oo  
BOOL UnInit()   t!_<~  
{ t,+nQ9  
 if(nHookCount>1){ MjC_ (cs  
  nHookCount--; ]z/8KL  
  return TRUE; 7Bd-!$j+  
 } /Y2}a<3&0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7E79-r&n  
 if(unhooked==TRUE){ Eu@huN*/  
  nHookCount=0; hFy;ffs.  
  hHook=NULL; %UERc{~o*,  
 } `ux{;4q  
 return unhooked; .7avpOfz  
} kr9*,E9cv  
aGtf z)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [`"ZjkR_J  
{ )9"_J9G  
 BOOL bAdded=FALSE; ]rH\`0  
 for(int index=0;index<MAX_KEY;index++){ 9Hb6nm  
  if(hCallWnd[index]==0){ gf &Pn  
   hCallWnd[index]=hWnd; b)qoh^  
   HotKey[index]=cKey; |Sy<@oq  
   HotKeyMask[index]=cMask; VyXhl;  
   bAdded=TRUE; ?kH8Lw~{5W  
   KeyCount++; AicBSqUke  
   break; pm 9"4z  
  } `tA" }1;ka  
 } <oT^A|JFj  
 return bAdded; vZaZc}AyL  
} =C8?M  
mpU$ +  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^cP!\E-^  
{ K}buH\yco  
 BOOL bRemoved=FALSE; p'*>vk  
 for(int index=0;index<MAX_KEY;index++){ Eg#K.5hJ  
  if(hCallWnd[index]==hWnd){ irFMmIb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZojI R\F^  
    hCallWnd[index]=NULL; fzb29 -  
    HotKey[index]=0; -pf}  
    HotKeyMask[index]=0; hKLCJ#T  
    bRemoved=TRUE; (:TjoXXiY  
    KeyCount--; RI 5yF  
    break; bLij7K 2H  
   } bMg(B-uF7  
  } !;Yg/'vD-  
 } cl[BF'.H  
 return bRemoved; AN8`7F1  
} lT(WD}OS  
zZPuha8  
void VerifyWindow() ]@j*/IP  
{ r3&G)g=u  
 for(int i=0;i<MAX_KEY;i++){ n'wU;!W9  
  if(hCallWnd!=NULL){ QdH\LL^8R4  
   if(!IsWindow(hCallWnd)){  Ch&a/S}  
    hCallWnd=NULL; :DrWq{4  
    HotKey=0; [R(`W#W  
    HotKeyMask=0; ]HKQDc'  
    KeyCount--; ,<n}W+3  
   } E4`N-3  
  } TyD4|| %  
 } >kj`7GA  
} Zd^rNHhA  
.zA^)qgL  
BOOL CHookApp::InitInstance() 0%9 q8 M;  
{ d A@]!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]fx"4qKM  
 hins=AfxGetInstanceHandle(); gn8R[5:!V  
 InitHotkey(); Q i,j+xBp  
 return CWinApp::InitInstance(); ZXqSH${Tp  
} 8p^bD}lN7  
tX9{hC^  
int CHookApp::ExitInstance() 5gH1.7i b  
{ \f]k CB  
 VerifyWindow(); 2#KJ asX  
 UnInit(); [pC$+NX  
 return CWinApp::ExitInstance(); 6Z>FTz_  
} m'Amli@[  
k$R~R-'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rXmn7;B}g  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 04LI]'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0[R L>;D:  
#if _MSC_VER > 1000 *rM^;4Zt  
#pragma once 1Ce@*XBU  
#endif // _MSC_VER > 1000 hv`~?n)D66  
iqC|G/  
class CCaptureDlg : public CDialog hEA<o67  
{ 14Xqn8uOW  
 // Construction Lz`E;k^  
 public: *"+=K,#D  
  BOOL bTray; 6.CbAi3Z  
  BOOL bRegistered; Pj#<K%Bz  
  BOOL RegisterHotkey(); :=}US}H$  
  UCHAR cKey; (n*^4@"2  
  UCHAR cMask; $yn];0$J  
  void DeleteIcon(); sT !~J4  
  void AddIcon(); KK1 gNC4R  
  UINT nCount; KX76UW   
  void SaveBmp(); @KWb+?_H{<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Q}1 R5@7  
  // Dialog Data whmdcVh.  
  //{{AFX_DATA(CCaptureDlg) h hG4-HD  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8e*,jH3  
  CComboBox m_Key; 2"0es40;0  
  BOOL m_bControl; Keuf9u  
  BOOL m_bAlt; TlXI|3Ip  
  BOOL m_bShift; 88VZR&v   
  CString m_Path; VeGL)  
  CString m_Number; {%<OD8>p  
  //}}AFX_DATA w:%o?pKet1  
  // ClassWizard generated virtual function overrides O;z,qo X  
  //{{AFX_VIRTUAL(CCaptureDlg) o}$XH,-9&  
 public: {\S+#W\  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ozw;(fDaU  
 protected: I, -hf=-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @E^~$-J5j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Qt iDTr  
  //}}AFX_VIRTUAL 3[\iQ*d }B  
  // Implementation AuUd e$l_  
 protected: u\E?Y[1  
  HICON m_hIcon; )'Oh `$M  
  // Generated message map functions Fw/6?:C}O6  
  //{{AFX_MSG(CCaptureDlg) m`IC6*  
  virtual BOOL OnInitDialog(); ~Fe${2   
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~res V  
  afx_msg void OnPaint(); @x9a?L.48  
  afx_msg HCURSOR OnQueryDragIcon(); c;%_EN%  
  virtual void OnCancel(); K\>tA)IPSV  
  afx_msg void OnAbout(); {s)+R[?m<o  
  afx_msg void OnBrowse(); sSOOXdnGG  
  afx_msg void OnChange(); stG~AC  
 //}}AFX_MSG #,S0HDDHn  
 DECLARE_MESSAGE_MAP() * "R|4"uy  
}; Mx6@$tQ%  
#endif /d0K7F  
t2EHrji~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I'\kFjc  
#include "stdafx.h" s4G|_==  
#include "Capture.h" wQv'8A_}  
#include "CaptureDlg.h" 4A@NxihH  
#include <windowsx.h> x N=i]~  
#pragma comment(lib,"hook.lib") zw+B9PYqX  
#ifdef _DEBUG flk=>h|  
#define new DEBUG_NEW H]Cy=Zi"  
#undef THIS_FILE D Gr> 2  
static char THIS_FILE[] = __FILE__; CJ(NgYC h  
#endif vK 7^*qr;j  
#define IDM_SHELL WM_USER+1 [!!o-9b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O>SLOWgha  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aF)1Nm[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )_1zRT|9  
class CAboutDlg : public CDialog \x)n>{3C  
{ W^fuScG)c  
 public: Q&MZN);.  
  CAboutDlg(); +hvO^?4j  
  // Dialog Data pV.Av  
  //{{AFX_DATA(CAboutDlg) #rxVd 7f  
  enum { IDD = IDD_ABOUTBOX }; *j]9vktH  
  //}}AFX_DATA 6^uq?  
  // ClassWizard generated virtual function overrides 8'~[pMn`  
  //{{AFX_VIRTUAL(CAboutDlg) K|Ld,bq  
 protected: g$HwxA9Gp/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xm%Um\Pb7  
  //}}AFX_VIRTUAL 6;C3RU]  
  // Implementation 1v,Us5s<"6  
 protected: /<E5"Mm%  
  //{{AFX_MSG(CAboutDlg) :{qv~&+C  
  //}}AFX_MSG (EK"V';   
  DECLARE_MESSAGE_MAP() iOwx0GD.n  
}; ` jzTmt  
W- i&sUgy  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) t>1Z\lE\"  
{ ~7Ts_:E-  
 //{{AFX_DATA_INIT(CAboutDlg) s >e=?W  
 //}}AFX_DATA_INIT rrQQZ5fhb  
} K#*reJ}K  
CF+_/s#j^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) io,M{Ib  
{ Of{/t1o?  
 CDialog::DoDataExchange(pDX); ObLly%|i  
 //{{AFX_DATA_MAP(CAboutDlg) .jS~By|r  
 //}}AFX_DATA_MAP s_x:T<]  
} T?:glp[4I  
M%1}/!J3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j{Hao\F8  
 //{{AFX_MSG_MAP(CAboutDlg) AK\$i$@6  
 // No message handlers ?47@ o1  
 //}}AFX_MSG_MAP =Vy`J)z9  
END_MESSAGE_MAP() ^&bRX4pYo  
b8LoIY*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) b7!Qn}  
: CDialog(CCaptureDlg::IDD, pParent) r) $+   
{ 2R=DB`3  
 //{{AFX_DATA_INIT(CCaptureDlg) /I)yU>o  
  m_bControl = FALSE; IB# @yH  
  m_bAlt = FALSE; hF@Gn/  
  m_bShift = FALSE; x%+aKZ(m)  
  m_Path = _T("c:\\"); $-#Yl&?z9  
  m_Number = _T("0 picture captured."); } b=}uiR#  
  nCount=0; "*LD 3  
  bRegistered=FALSE; tj Gd )  
  bTray=FALSE; )Psb>'X  
 //}}AFX_DATA_INIT WcHgBbNe  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 T/^Hz4uA7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .pfP7weQ  
} 6)vSG7Ise  
cU{e`<xjA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?T>'j mmV=  
{ ~><^'j[  
 CDialog::DoDataExchange(pDX); :4MB]v[K  
 //{{AFX_DATA_MAP(CCaptureDlg) F)s{PCl  
  DDX_Control(pDX, IDC_KEY, m_Key); UlAzJO6"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9cEv&3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); YqPQ%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); C8 vOE`U,J  
  DDX_Text(pDX, IDC_PATH, m_Path); KN t t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); x9x E&  
 //}}AFX_DATA_MAP @+9<O0  
} a@\D$#2r  
%]I ZLJ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &v"3*.org@  
//{{AFX_MSG_MAP(CCaptureDlg) &Y 4F!Rb  
 ON_WM_SYSCOMMAND() z I+\Oll#Q  
 ON_WM_PAINT() hSFn8mpXT  
 ON_WM_QUERYDRAGICON() ;5tazBy&:C  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) M/):e$S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Tszp3,]f  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *^RmjW1I  
//}}AFX_MSG_MAP n>A98NQ  
END_MESSAGE_MAP() ~v'3"k6  
#]#sGmW/L  
BOOL CCaptureDlg::OnInitDialog() H"C[&r  
{ =egW  
 CDialog::OnInitDialog(); {X[ HCfJd  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *P 3V  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?V}j`r8|\4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -s|}Rh?Y  
 if (pSysMenu != NULL) T"&)&"W*U  
 { Q>R>R*1.j  
  CString strAboutMenu; TYlbU<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Yr w$  
  if (!strAboutMenu.IsEmpty()) qwK2WE%T  
  { CBDG./  
   pSysMenu->AppendMenu(MF_SEPARATOR); mk3_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); m! W3Cwz\&  
  } *J+_|_0nlW  
 } lj{VL}R  
 SetIcon(m_hIcon, TRUE); // Set big icon 0b/WpP  
 SetIcon(m_hIcon, FALSE); // Set small icon -AhwI  
 m_Key.SetCurSel(0); ?x+Z)`w_  
 RegisterHotkey(); f8SL3+v  
 CMenu* pMenu=GetSystemMenu(FALSE); f+|$&p%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8E8N6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hzI|A~MFB  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); q~@]W=  
 return TRUE; // return TRUE unless you set the focus to a control S.Z9$k%   
} P i Fm|  
`Pw*_2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `xz<>g9e  
{ 4*aZ>R2hO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $2<d<Um~z  
 { #/NS&_Ge0s  
  CAboutDlg dlgAbout; ->h6j  
  dlgAbout.DoModal(); })w*m  
 } A>[|g`;t  
 else 3:{yJdpg  
 { k"g._|G  
  CDialog::OnSysCommand(nID, lParam); Yk42(!  
 } p-%|P ]&  
} :K ~  
\}~s2Y5j  
void CCaptureDlg::OnPaint() 0<PR+Iv*i  
{ i5>+}$1  
 if (IsIconic()) n!6Z]\8~$  
 { T~fmk f$  
  CPaintDC dc(this); // device context for painting DI`%zLDcY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a=XW[TY1  
  // Center icon in client rectangle Sa"9^_.2#  
  int cxIcon = GetSystemMetrics(SM_CXICON); ~2d:Q6  
  int cyIcon = GetSystemMetrics(SM_CYICON); g~BoFc.V2~  
  CRect rect; cEe? *\G  
  GetClientRect(&rect); U$H @ jJ*  
  int x = (rect.Width() - cxIcon + 1) / 2; ^ FZ^6*  
  int y = (rect.Height() - cyIcon + 1) / 2; eUl/o1~mXa  
  // Draw the icon #{9G sD  
  dc.DrawIcon(x, y, m_hIcon); =pA IvU  
 } QQe;1O  
 else uY< H#k  
 { )2DQ>cm  
  CDialog::OnPaint(); CSV;+,Vv  
 } {B*W\[ns  
} Qp2I[Ioz3  
]NhS=3*i+  
HCURSOR CCaptureDlg::OnQueryDragIcon() ^). )  
{ H0a/(4/xg  
 return (HCURSOR) m_hIcon; {F N;'Uc  
} :Vg}V"QR  
'!Gs>T+  
void CCaptureDlg::OnCancel() F8e<}v&7R  
{ ^MD;"A<  
 if(bTray) uhV0J97  
  DeleteIcon(); bXYA5wG  
  CDialog::OnCancel(); 44\>gI<  
} Gjz[1d  
xjdw'v+qZo  
void CCaptureDlg::OnAbout() 1\dn 1Hh  
{ iRG?# "  
 CAboutDlg dlg; ^*R(!P^  
 dlg.DoModal(); ql5x2n  
} <-UOISyf  
n,P5o_^:  
void CCaptureDlg::OnBrowse() o@lWBfB*%e  
{ p4VqV6LwD  
 CString str; |0bc$ZY:  
 BROWSEINFO bi; ,/&Zw01dGN  
 char name[MAX_PATH]; %up}p/?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); V'Qn sI  
 bi.hwndOwner=GetSafeHwnd(); ID};<[  
 bi.pszDisplayName=name; ,D80/2U^  
 bi.lpszTitle="Select folder"; XeUC0K[D  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Q |i9aE  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); RE46k`44  
 if(idl==NULL) Z& !!]"I  
  return; sCH)gr@gJ^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Zu<]bv  
 str.ReleaseBuffer(); XOb}<y)r~  
 m_Path=str; #P2;K dDO  
 if(str.GetAt(str.GetLength()-1)!='\\') f1{z~i9@$  
  m_Path+="\\"; #j@OLvXh  
 UpdateData(FALSE); qFR dg V>8  
} h:qHR] 8dZ  
}4c/YP"a'E  
void CCaptureDlg::SaveBmp() p{;i& HNdp  
{ oJ;rc{n-  
 CDC dc; whc[@Tyx  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); V+B71\x<  
 CBitmap bm; )c tr"&-  
 int Width=GetSystemMetrics(SM_CXSCREEN); Wr|G:(kw\!  
 int Height=GetSystemMetrics(SM_CYSCREEN); ZykrQ\q9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 18!VO4u\I  
 CDC tdc; 2wh#$zGy  
 tdc.CreateCompatibleDC(&dc); NCt~9xS.  
 CBitmap*pOld=tdc.SelectObject(&bm); ZCiY,;c  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Pern*x9$  
 tdc.SelectObject(pOld); a1x7~)z>zi  
 BITMAP btm; T)\NkM&  
 bm.GetBitmap(&btm); 9&jPp4qG  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >BiRk%x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 70iH0j)  
 BITMAPINFOHEADER bih; TgaYt\"i[  
 bih.biBitCount=btm.bmBitsPixel; X8 qIia  
 bih.biClrImportant=0; .hz2&9Ow  
 bih.biClrUsed=0; 6v47 QW|'  
 bih.biCompression=0; {\We72!  
 bih.biHeight=btm.bmHeight; @ ^. *$E5  
 bih.biPlanes=1; i>GdRG&q  
 bih.biSize=sizeof(BITMAPINFOHEADER); b(T@~P/  
 bih.biSizeImage=size; do' ORcZ  
 bih.biWidth=btm.bmWidth; P4%>k6X  
 bih.biXPelsPerMeter=0; .Ty,_3+{#p  
 bih.biYPelsPerMeter=0; &va*IR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _t.FL@3e  
 static int filecount=0; 8-A|C< "  
 CString name; gM, &Spn  
 name.Format("pict%04d.bmp",filecount++); &z ksRX  
 name=m_Path+name; plku-O;]  
 BITMAPFILEHEADER bfh; 3j&B(aLy  
 bfh.bfReserved1=bfh.bfReserved2=0; YN^jm  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qy9i9$8  
 bfh.bfSize=54+size; #JS`e_3Rr  
 bfh.bfOffBits=54; ADBpX>  
 CFile bf; PW^ 8;[\QP  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ewQe/Fq  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #~e9h9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (6-y+ LG  
  bf.WriteHuge(lpData,size); ,aO@.<"  
  bf.Close(); Bm<^rhJ9  
  nCount++; 'a_s%{BJXg  
 } %yhI;M^  
 GlobalFreePtr(lpData); ^2JPyyZa  
 if(nCount==1) J";=d4Sd  
  m_Number.Format("%d picture captured.",nCount); Q 3X  
 else V0T<eH<  
  m_Number.Format("%d pictures captured.",nCount); o'^phlX  
  UpdateData(FALSE); MA"#rOcP  
} jMqx   
oVEAlBm^v  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $owb3g(%4  
{ 3FY_A(+  
 if(pMsg -> message == WM_KEYDOWN) 19w_tSg  
 { DUo0w f#D^  
  if(pMsg -> wParam == VK_ESCAPE) OaNc9c"  
   return TRUE; \gP. \  
  if(pMsg -> wParam == VK_RETURN) )^(P@D.L  
   return TRUE; A`Q >h{  
 } \Nyr=<c  
 return CDialog::PreTranslateMessage(pMsg); , | <jjq)  
} !c."   
H}a)^90_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3FuCW  
{ q /:T1a7!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >F~ITk5`Oo  
  SaveBmp(); +/(|?7i@  
  return FALSE; _ flg Q  
} )*Vj3Jx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^+URv  
 CMenu pop; 9D%qXU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pOX$4$VR<  
 CMenu*pMenu=pop.GetSubMenu(0);  I}rGx  
 pMenu->SetDefaultItem(ID_EXITICON); Vv2{^ !aZ  
 CPoint pt; U-1VnX9m  
 GetCursorPos(&pt); '%);%y@v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {dZ!I  
 if(id==ID_EXITICON) (;C$gnr.C  
  DeleteIcon(); E`(5UF*>  
 else if(id==ID_EXIT) "2%y~jrDN  
  OnCancel(); x<Iy<v7-  
 return FALSE; 87+.pM|t%  
} :ao^/&HZ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4bPqmEE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $1b]xQ  
 AddIcon(); loR,XW7z  
 return res; KUlB2Fqi  
} :a=ro2NH  
?U}sQ;c$  
void CCaptureDlg::AddIcon() H]VsOr  
{ AL(n *,  
 NOTIFYICONDATA data; U.Pa7tn  
 data.cbSize=sizeof(NOTIFYICONDATA); =kwb` Z/a  
 CString tip; (_s;aK  
 tip.LoadString(IDS_ICONTIP); ! Zno[R  
 data.hIcon=GetIcon(0); F19;RaP+  
 data.hWnd=GetSafeHwnd(); =VCi8jDkP  
 strcpy(data.szTip,tip); |GJBwrL^0  
 data.uCallbackMessage=IDM_SHELL; gkSGRshf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q -M rH   
 data.uID=98; "9)1K!tH  
 Shell_NotifyIcon(NIM_ADD,&data); 37J\i ]  
 ShowWindow(SW_HIDE); MP6 \r  
 bTray=TRUE; x&QNP  
} 5JO[+>  
M|1eqR%x-?  
void CCaptureDlg::DeleteIcon() jB*9 !xrd,  
{ RmcYa j^=  
 NOTIFYICONDATA data; m]bL)]Z  
 data.cbSize=sizeof(NOTIFYICONDATA); N;e;4,_ n  
 data.hWnd=GetSafeHwnd(); ]R97n|s_  
 data.uID=98; 3FGbQ_  
 Shell_NotifyIcon(NIM_DELETE,&data); '=KuJ0`nE9  
 ShowWindow(SW_SHOW); ; :v]NZtc  
 SetForegroundWindow(); j:3A;r\  
 ShowWindow(SW_SHOWNORMAL); R1]v}f_I"  
 bTray=FALSE; V`WI"HO+  
} N{?Tm`""  
\9dz&H  
void CCaptureDlg::OnChange() ~Da >{zHt  
{ m~Lf^gbG?  
 RegisterHotkey(); rU/-Wq`B  
} v1`bDS?*Q  
aL_;`@4  
BOOL CCaptureDlg::RegisterHotkey() BsoFQw4$9  
{ >WGX|"!"  
 UpdateData(); 44Seq  
 UCHAR mask=0; Vvxc8v:  
 UCHAR key=0; |[lxV&SD .  
 if(m_bControl) nOA ,x  
  mask|=4; fJSV)\e0  
 if(m_bAlt) ?^e*UJNM  
  mask|=2; 17MN8SfQ  
 if(m_bShift) .#:@cP~v  
  mask|=1; R47I\{  
  key=Key_Table[m_Key.GetCurSel()]; mvW^P`nB  
 if(bRegistered){ *g/I&'^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]5qjK~,4b  
  bRegistered=FALSE; cG~_EX$  
 } baO&n  
 cMask=mask; !VJT"Ds_  
 cKey=key; ;DT"S{"7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f4@#pnJ3po  
 return bRegistered; jS5t?0  
} MRxo|A{  
T8M[eSbZ  
  四、小结 Bt`r6v;\  
=:0IHyB#0  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

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