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
  • 6813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: P& 1$SWNyW  
  !8 @yi"n  
  一、实现方法 nlv,j&  
S}C[  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: i#:To |\u  
75\ZD-{T:  
#pragma data_seg("shareddata") y [McdlH m  
HHOOK hHook =NULL; //钩子句柄 p[4 +`8  
UINT nHookCount =0; //挂接的程序数目 2$JZ(qnN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 19fa7E<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 EZ!! V~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey X;LYGJ{Xk  
static int KeyCount =0; =z}PR1X!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 GgxPpS<ne  
#pragma data_seg() Z=% j|xE_  
~~yng-3)1  
  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。 s9C^Cy^su  
L@Rgiq|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: +s#%\:Y M  
P(PBOB97  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR x(c+~4:_M  
cKey,UCHAR cMask) SGKAx<U  
{ &YIL As^8A  
 BOOL bAdded=FALSE; M~zI;:0O  
 for(int index=0;index<MAX_KEY;index++){ O/eZ1YAC  
  if(hCallWnd[index]==0){ ?;tPqOs&  
   hCallWnd[index]=hWnd; z$&B7?  
   HotKey[index]=cKey; |5flvkid  
   HotKeyMask[index]=cMask; >33=0<  
   bAdded=TRUE; _`gF%$]b  
   KeyCount++; Mmz; uy_  
   break; T#*,ME7|m  
  } K+Him] b  
 } yl$Ko  
 return bAdded; 1ZF KLI`V  
} !w7/G  
//删除热键 -aT-<+?s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) inW7t2p<s  
{ RZW=z}T+H  
 BOOL bRemoved=FALSE; J@>|`9T9$  
 for(int index=0;index<MAX_KEY;index++){ YI0l&'7  
  if(hCallWnd[index]==hWnd){ NLZ5 5yo$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _4oAk @A  
    hCallWnd[index]=NULL; ^mC~<p P(  
    HotKey[index]=0; :uYZ1O  
    HotKeyMask[index]=0; .5 E)dU  
    bRemoved=TRUE; ue8 @=}  
    KeyCount--; )Q1aAS3  
    break; 1tbA-+  
   } q&=z^Ln!G  
  } pCkMm)2g!  
 } 4$^mLD$>  
 return bRemoved; U_VP\ 03  
} F,vkk{Z>  
@*rMMy 4  
0^*,E/}P&  
  DLL中的钩子函数如下: ;[o:VuTs  
K2*rqg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) IWYQ67Yj   
{ k*_Gg  
 BOOL bProcessed=FALSE; 'n h^;  
 if(HC_ACTION==nCode) `NhG|g  
 { tHzgZo Bz  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0$Tb5+H5  
   switch(wParam) QP~["%}T  
   {  bEF2- FO  
    case VK_MENU: Qw_uwQZ)  
     MaskBits&=~ALTBIT; n\;;T1rM  
     break; i7)J|(N2.  
    case VK_CONTROL: Zf>:h   
     MaskBits&=~CTRLBIT; r!b>!  
     break; "PMJh3q  
    case VK_SHIFT: 'LoWp} f9  
     MaskBits&=~SHIFTBIT; $j,$O>V  
     break; $mK;{9Z  
    default: //judge the key and send message j f4<LmR  
     break; >}wFePl  
   } iUz?mt;k  
   for(int index=0;index<MAX_KEY;index++){ nHF66,7t  
    if(hCallWnd[index]==NULL) {_tq6ja-<  
     continue; TgJ+:^+0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pIR_2Eq  
    { (J4( Ge  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'WHI.*=  
     bProcessed=TRUE; }\m.~$|[  
    } CH `Kpt  
   } /w?zO,!  
  } sI6*.nR  
  else if((lParam&0xc000ffff)==1){ //有键按下 .0,G4k/yv  
   switch(wParam) a{ke%W$*P  
   { &W3srJo  
    case VK_MENU: MMO/vJC  
     MaskBits|=ALTBIT; '-(Z.e~e  
     break; E4=D$hfq`  
    case VK_CONTROL: ("(wap~<nD  
     MaskBits|=CTRLBIT; '=G6$O2  
     break; L_ T+KaQCH  
    case VK_SHIFT: |;:Kn*0/]  
     MaskBits|=SHIFTBIT; s5v}S'uO{  
     break; E<D^j^T  
    default: //judge the key and send message N[-$*F,:_  
     break; uo?R;fX26  
   } KCpq<A%  
   for(int index=0;index<MAX_KEY;index++){ qsEFf(9G  
    if(hCallWnd[index]==NULL) I] +OYWp  
     continue; Zk~Pq%u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6W:]'L4!  
    { `_.:O,^n^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tSni[,4Kq  
     bProcessed=TRUE; [c;0eFSi2  
    } 63'% +  
   } cjtcEW  
  } 1Z?uT[kR  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oNYFbZw  
   for(int index=0;index<MAX_KEY;index++){ Vo[.^0  
    if(hCallWnd[index]==NULL) cSv;HN:  
     continue; E3{kH 7_'\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vug[q=i  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'I}wN5`  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 H`k YDp  
   } 14l6|a  
  }  ngJ{az  
 } ]):>9q$C  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ' Hj([N  
} fg ,vTpBk  
*'?V>q,  
  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: 1}Guhayy  
GB Vqc!d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 QXsr<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @:Ft+*2  
A:4&XRYZY  
  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: ?ecR9X k  
~("bpS#ZgD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -ert42fN  
{ ,+Ocb-*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3=?,Dv0P  
 { 7k%!D"6_R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;FuST  
  SaveBmp(); (QojIdHt  
  return FALSE; 9Y:.v@:}0  
 }  6shN%  
 …… //其它处理及默认处理 ;P}007;  
} } gwfe H  
JoG(Nk]  
E: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。 !]fSS)\H  
XR<g~&h  
  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。 ,dosF Q  
xY.?OHgG/  
  二、编程步骤 *>:<  
yK"HHdYTV  
  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"; "9X!Ewm"P  
vqVwo\oEdU  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Kv:.bHN}  
pI.8Ip_r  
  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; u^i3@JuX  
. qf~t/o  
  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; 4\ElMb[]  
.=yv m  
  5、 添加代码,编译运行程序。 n``9H 91  
#RyTa /L  
三、程序代码 )Pc>+} D  
=j20A6gND  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {~#PM>f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hpbi!g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WAtv4  
#if _MSC_VER > 1000 3A =\Mb  
#pragma once .h/2-pQ>  
#endif // _MSC_VER > 1000 S !lrnH  
#ifndef __AFXWIN_H__ 0ap'6  
#error include 'stdafx.h' before including this file for PCH 1fM`n5?"  
#endif eHIcfp@&  
#include "resource.h" // main symbols 8N |K   
class CHookApp : public CWinApp )lz)h*%#  
{ *c%{b3T_  
 public: >[nR$8_J-l  
  CHookApp(); g-ZXj4Ph!  
  // Overrides  V_e  
  // ClassWizard generated virtual function overrides RU/SJ1wM"  
  //{{AFX_VIRTUAL(CHookApp) I#]pk!  
 public: 6f t6;*,  
  virtual BOOL InitInstance(); >Y\?v-^~;  
  virtual int ExitInstance(); QX&Y6CC`]  
  //}}AFX_VIRTUAL @KHY8y7  
  //{{AFX_MSG(CHookApp) o!&+ _BKw  
  // NOTE - the ClassWizard will add and remove member functions here. Vo.~1^  
  // DO NOT EDIT what you see in these blocks of generated code ! fo~*Bp()-E  
  //}}AFX_MSG WCk. K  
  DECLARE_MESSAGE_MAP() C1l'<  
}; \"L0d1DK)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +T4}wm  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q`;eI a6U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OZz!8-|wE  
BOOL InitHotkey(); ^B}q@/KV  
BOOL UnInit(); %<p/s;eu  
#endif 5eyB\>k,  
QUZ+#*:s  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \hEIQjfi  
#include "stdafx.h" qu'D"0  
#include "hook.h" iweT @P`  
#include <windowsx.h> XWNo)#_3  
#ifdef _DEBUG 2AMb-&po&f  
#define new DEBUG_NEW QctzIC#;k  
#undef THIS_FILE 8\C][ y  
static char THIS_FILE[] = __FILE__; _ShWCU-~Z  
#endif <c<!|<x  
#define MAX_KEY 100 fz8 41 <Y  
#define CTRLBIT 0x04 B~@Gfb>`'  
#define ALTBIT 0x02 .A_R6~::  
#define SHIFTBIT 0x01 @SaxM4  
#pragma data_seg("shareddata") ;n|%W,b-  
HHOOK hHook =NULL; &m\Uc  
UINT nHookCount =0; =&Tuh}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey "(dI/}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 4pelIoj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^K4?uABc  
static int KeyCount =0; >vYb'%02  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C(8!("tU  
#pragma data_seg() 1;B&R89}  
HINSTANCE hins; m],.w M8  
void VerifyWindow(); kkMChe};5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) m6}_kzFz  
//{{AFX_MSG_MAP(CHookApp) {.;qz4d`  
// NOTE - the ClassWizard will add and remove mapping macros here. hM>.xr  
// DO NOT EDIT what you see in these blocks of generated code! 8TU(5:xJo  
//}}AFX_MSG_MAP K:Z(jF!j  
END_MESSAGE_MAP() =FiO{Aw`N  
^j10 f$B  
CHookApp::CHookApp() PY3bn).uR  
{ jffNA^e  
 // TODO: add construction code here, 0jPUDkH*  
 // Place all significant initialization in InitInstance ^ZRZ0:rZ  
} GZn=Hgv8  
K_:2sDCaN  
CHookApp theApp; |b^UPrz)VS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $A/?evJi8R  
{ d%nX;w,  
 BOOL bProcessed=FALSE; 1A#/70Mo  
 if(HC_ACTION==nCode) OQKc_z'"  
 { ,q7FK z{  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zu>-y#Bw  
   switch(wParam) u86@zlzd  
   { 28c6~*Te #  
    case VK_MENU: e{XzUY6  
     MaskBits&=~ALTBIT; Rh$+9w  
     break; y7rT[f/J  
    case VK_CONTROL: s aHY9{)  
     MaskBits&=~CTRLBIT; BgDWl{pm  
     break; x%[NK[^&  
    case VK_SHIFT: EgbH{)u  
     MaskBits&=~SHIFTBIT; FgrVXb_q  
     break; Je2&7uR0  
    default: //judge the key and send message !#*#jixo  
     break; BpX`49  
   } fBz|-I:k +  
   for(int index=0;index<MAX_KEY;index++){ @0C[o9  
    if(hCallWnd[index]==NULL) CPeu="[  
     continue; NpKyrXDJv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dD~H ft  
    { f5{|_]q]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c5 AaUza  
     bProcessed=TRUE; Q"c/]Sk)  
    } \i}-Y[Dg  
   } ~t$ng l$  
  } {{>,c}O /  
  else if((lParam&0xc000ffff)==1){ //Key down /eXiWasQ  
   switch(wParam) WSv%Rxr8L  
   { $;~YgOVZ5  
    case VK_MENU: P|p X F~  
     MaskBits|=ALTBIT; =K|#5p`  
     break; ]l+<-  
    case VK_CONTROL: n\<7`,  
     MaskBits|=CTRLBIT; ,S<) )  
     break; s16, *;Z  
    case VK_SHIFT: H8HVmfM  
     MaskBits|=SHIFTBIT; ?U O aqcL  
     break; {cO8q }L  
    default: //judge the key and send message ' u;Zw%O(J  
     break; qdmAkYUC  
   } :*DWL!a  
   for(int index=0;index<MAX_KEY;index++) FZZO-,xa  
   { ~3Zz.!F  
    if(hCallWnd[index]==NULL) nD]Mg T  
     continue; ("}C& 6)cB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9k6/D.Dz  
    { uqa pj("  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BIew\N  
     bProcessed=TRUE; YK$[)x\S  
    } iVf7;M8O  
   } t.VVE:A^%  
  } FKL@,>!<e  
  if(!bProcessed){ wPu.hVz  
   for(int index=0;index<MAX_KEY;index++){ v;Q*0%~  
    if(hCallWnd[index]==NULL) ;(;~yB|NZ5  
     continue; TA:uB[Ji  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +{m+aHk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); A=Hv}lv  
   } zxH<~2  
  } 0 z]H=  
 } J P5en  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UIg?3J}R  
} KsK]y,^Z  
;3xi.^=B  
BOOL InitHotkey() gy~2LY!}  
{ 11Qi _T\  
 if(hHook!=NULL){ pzUr9  
  nHookCount++; .X"&k O>G  
  return TRUE; I&gd"F _v}  
 } b!Nr  
 else a~LdcUYs  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  ST~YO  
  if(hHook!=NULL) pFZ$z?lI  
   nHookCount++; TX@ed  
  return (hHook!=NULL); 9^`cVjD5  
} & ,:!gYN  
BOOL UnInit() >&R@L KP  
{ *//z$la  
 if(nHookCount>1){ `kv7Rr}Q  
  nHookCount--; SDNRcSbOD6  
  return TRUE; XP:fL NpQ  
 } 55UPd#E'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); K :+q9;g  
 if(unhooked==TRUE){ Bt5 P][<  
  nHookCount=0; WPlf8* -fQ  
  hHook=NULL; /vi Ic %=  
 } ~Cw7.NA{3  
 return unhooked; Kng=v~)N'  
} o"z;k3(i$7  
S')DAx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hA1B C3  
{ + @|u8+  
 BOOL bAdded=FALSE; W/WP }QM  
 for(int index=0;index<MAX_KEY;index++){ e6tU8`z  
  if(hCallWnd[index]==0){ (: k n)  
   hCallWnd[index]=hWnd; Iw)m9h  
   HotKey[index]=cKey; T5e#Ll/  
   HotKeyMask[index]=cMask; rz-61A) _  
   bAdded=TRUE; K`uPPyv  
   KeyCount++; 4g}r+!T  
   break; 92.Rjz;=9?  
  } eT5IL(mH  
 } H\E%.QIx  
 return bAdded; ?"<m{,yQI  
} *zDDi(@vtK  
@qjN>PH~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bi+g=cS  
{ "rEfhzmyF  
 BOOL bRemoved=FALSE; jq8TfJ|   
 for(int index=0;index<MAX_KEY;index++){ 8fBhX,1  
  if(hCallWnd[index]==hWnd){ <exyd6iI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >SziRm>Y7  
    hCallWnd[index]=NULL; 9=/4}!.  
    HotKey[index]=0; =OV5DmVmQ  
    HotKeyMask[index]=0; .0gfP4{1{  
    bRemoved=TRUE; *=v%($~PK6  
    KeyCount--; w^ofH-R/  
    break; uTPAf^|  
   } :pz@'J  
  } nnE'zk<"  
 } V=5*)i/  
 return bRemoved; 7r)]9_[(  
} !O}e)t  
9%3+\[s1  
void VerifyWindow() r|\{!;7  
{ -e_TJA  
 for(int i=0;i<MAX_KEY;i++){ k$8Zg*)  
  if(hCallWnd!=NULL){ NG:4Q.G1g  
   if(!IsWindow(hCallWnd)){ @OUBo;/  
    hCallWnd=NULL; JdUdl_D z  
    HotKey=0; TgDT  
    HotKeyMask=0; Xo[cpcV  
    KeyCount--; )p>p3b g  
   } u>agVB4\F  
  } 8\:>;XG6f  
 } 7t}s5}Z 4  
} k{b|w')  
uysTyzx  
BOOL CHookApp::InitInstance() F$1{w"&  
{ a_{'I6a*,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); C!+PBk[9  
 hins=AfxGetInstanceHandle(); tX1`/}``  
 InitHotkey(); )\2KDXc  
 return CWinApp::InitInstance(); AFvv+ ss  
} 5rCJIl.  
f? GoBh<  
int CHookApp::ExitInstance() $ve$Sq  
{ i[FYR;C  
 VerifyWindow(); tSoF!@6  
 UnInit(); _LfbEv<,T  
 return CWinApp::ExitInstance(); 3$:F/H  
} }aXSMxCd  
,WnZ^R/n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file '/9MN;_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wxj}k7_(`A  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0c!^=(  
#if _MSC_VER > 1000 KD+&5=Y  
#pragma once Bj><0 cNF  
#endif // _MSC_VER > 1000 0raFb,6l  
BI*0JKQu  
class CCaptureDlg : public CDialog 9kqR-T|Q  
{ fZsw+PSy  
 // Construction vSoG] :1  
 public: N=T}  
  BOOL bTray; )8}k.t>'s  
  BOOL bRegistered; WJa7  
  BOOL RegisterHotkey(); F:jtzy"  
  UCHAR cKey; 9xw"NcL  
  UCHAR cMask; dBovcc  
  void DeleteIcon(); 7^M$u\a)U  
  void AddIcon(); L ed{#+  
  UINT nCount; `/N={  
  void SaveBmp(); t:P]bp^#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .H qJ)OH  
  // Dialog Data <ME>#,  
  //{{AFX_DATA(CCaptureDlg) &sBD0R(a  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0L#i c61U  
  CComboBox m_Key; i1KjQ1\a+  
  BOOL m_bControl; S# baOO  
  BOOL m_bAlt; i`];xNR'  
  BOOL m_bShift; O<,\ tZ'N  
  CString m_Path; ed_+bCNy  
  CString m_Number; l7VTuVGUJ  
  //}}AFX_DATA q{b-2k  
  // ClassWizard generated virtual function overrides Lr6C@pI  
  //{{AFX_VIRTUAL(CCaptureDlg) c{?SFwgd  
 public: ,C 0y3pL  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6w m-uu  
 protected: D/4]r@M2c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3b_/QT5!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0CXXCa7!  
  //}}AFX_VIRTUAL `r3 klL,W'  
  // Implementation bXXX-Xc  
 protected: gYk5}E-  
  HICON m_hIcon; %0}}Qt  
  // Generated message map functions 2DJg__("  
  //{{AFX_MSG(CCaptureDlg) L;{{P7  
  virtual BOOL OnInitDialog(); d=uGB"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C|w<mryx  
  afx_msg void OnPaint(); H`URJ8k$Q  
  afx_msg HCURSOR OnQueryDragIcon(); 3#]IIj`\  
  virtual void OnCancel(); >m <T+{`  
  afx_msg void OnAbout(); E?KPez  
  afx_msg void OnBrowse(); B <qsa QG  
  afx_msg void OnChange(); ]$^HGmP  
 //}}AFX_MSG ME]89 T &  
 DECLARE_MESSAGE_MAP() mQ`2c:Rn&7  
}; =ePX^J*M'  
#endif lVd-{m)  
; 2V$`k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \*b  .f  
#include "stdafx.h" YN<vOv  
#include "Capture.h" D Y4!RjJ47  
#include "CaptureDlg.h" Gx}`_[-  
#include <windowsx.h> r#& JfAo  
#pragma comment(lib,"hook.lib") &V+KM"Ow  
#ifdef _DEBUG X%(NI(+x,  
#define new DEBUG_NEW T:2f*!r  
#undef THIS_FILE 3k(tv U+eC  
static char THIS_FILE[] = __FILE__; ?K2}<H-  
#endif cTRtMk%^  
#define IDM_SHELL WM_USER+1 ONy\/lu|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E.ji;5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &N6[*7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /]-yZ0hX0O  
class CAboutDlg : public CDialog XIZN9/;  
{ *o:J 4'  
 public: vZ57 S13  
  CAboutDlg();  iD])E/  
  // Dialog Data N'aq4okoL  
  //{{AFX_DATA(CAboutDlg) ]vs}-go  
  enum { IDD = IDD_ABOUTBOX }; B>=D$*_  
  //}}AFX_DATA =2NrmwWZs  
  // ClassWizard generated virtual function overrides W+U0Y,N6  
  //{{AFX_VIRTUAL(CAboutDlg) AJ& j|/  
 protected: f8N* [by  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4pQf*l8e  
  //}}AFX_VIRTUAL j|&D(]W/  
  // Implementation  zy"k b  
 protected: L]!![v.VY  
  //{{AFX_MSG(CAboutDlg) #ley3rJW]  
  //}}AFX_MSG !!V1#?0jw  
  DECLARE_MESSAGE_MAP() 8Q)|8xpYS  
}; w $-q&  
bolG3Tf|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9\WtcLx  
{ 8HJ,6Lr;  
 //{{AFX_DATA_INIT(CAboutDlg) U.I w/T-5  
 //}}AFX_DATA_INIT vyJ8" #]qY  
} \O;/wf0Hg  
: #?_4D!r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~"J1 @<  
{ e`LkCy[_  
 CDialog::DoDataExchange(pDX); vxC];nCC#  
 //{{AFX_DATA_MAP(CAboutDlg) 4Otq3s34FT  
 //}}AFX_DATA_MAP t^zE^:06  
} :3 Hz!iZM  
2PRiiL@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >JsVIfAF  
 //{{AFX_MSG_MAP(CAboutDlg) Z}\,rex  
 // No message handlers 6_u!{  
 //}}AFX_MSG_MAP Q3&D A1b`  
END_MESSAGE_MAP() #Y=b7|l  
z~~pH9=c2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &p_iAMn:9  
: CDialog(CCaptureDlg::IDD, pParent) )`'a1y|  
{ 8M,@Mb n  
 //{{AFX_DATA_INIT(CCaptureDlg) {,h_T0D^j  
  m_bControl = FALSE;  ,Zb  
  m_bAlt = FALSE; A[7H-1-  
  m_bShift = FALSE; -C~zvP; a  
  m_Path = _T("c:\\"); PlS)Zv3  
  m_Number = _T("0 picture captured."); -qaO$M^Q  
  nCount=0; 0#8, (6  
  bRegistered=FALSE; ;]m;p,$  
  bTray=FALSE; 32SkxcfrCK  
 //}}AFX_DATA_INIT =p=/@FN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :A @f[Y'9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )[ZXPD  
} T$R#d&t  
`L7^f!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *n&Sd~Mg  
{ PI`Y%!P  
 CDialog::DoDataExchange(pDX); 9@q!~ur  
 //{{AFX_DATA_MAP(CCaptureDlg) _b-g^#L%  
  DDX_Control(pDX, IDC_KEY, m_Key); Qb>("j~Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); c_+fA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6fI2y4yEz  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L?j<KW  
  DDX_Text(pDX, IDC_PATH, m_Path); <\Y(+?+uZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 41Q)w=hoN  
 //}}AFX_DATA_MAP Et(H6O 8  
} j n SZ@u  
H' /V<%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /j$pV  
//{{AFX_MSG_MAP(CCaptureDlg) @sZ7Ka  
 ON_WM_SYSCOMMAND() X@tA+   
 ON_WM_PAINT() I(7iD. ^:  
 ON_WM_QUERYDRAGICON() ocK4Nxs  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]S@T|08b  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -=8f*K[W  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \ctzv``/n  
//}}AFX_MSG_MAP $!9/s S?  
END_MESSAGE_MAP() Z]TQ+9t  
Y%eW6Y#  
BOOL CCaptureDlg::OnInitDialog() ':_gYA  
{ X o9vE3  
 CDialog::OnInitDialog(); j?]+~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SSE,G!@  
 ASSERT(IDM_ABOUTBOX < 0xF000); a*D<J}xe  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U; <{P  
 if (pSysMenu != NULL) uuF~+=.|  
 { W% Lrp{  
  CString strAboutMenu; =EA @  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {Ke IYjE  
  if (!strAboutMenu.IsEmpty()) 2 YWO'PL  
  { qM26:kB{  
   pSysMenu->AppendMenu(MF_SEPARATOR); Pp69|lxV=k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .*oL@iX  
  } 1D8S}=5&  
 } CPcUB4a%#  
 SetIcon(m_hIcon, TRUE); // Set big icon %@)q=*=y  
 SetIcon(m_hIcon, FALSE); // Set small icon ONcLhwH  
 m_Key.SetCurSel(0); }b}jw.2Wu  
 RegisterHotkey(); \_R<Q?D+  
 CMenu* pMenu=GetSystemMenu(FALSE); aBY&]6^-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k{F6WQ7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0Qvr g+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); DO*6gzW  
 return TRUE; // return TRUE unless you set the focus to a control ^ /%Y]d$  
} W|rAn2H  
7]5~ml3:  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) w%)RX<h dI  
{ PyHL`PZZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V/"RCqY4  
 { ;Wk3>\nT-  
  CAboutDlg dlgAbout; 6 ]<yR> '  
  dlgAbout.DoModal(); +`Nu0y!rj  
 } <[}zw!z  
 else #<m2Xo?d]  
 { h;r^9g  
  CDialog::OnSysCommand(nID, lParam); G,Eh8 HboK  
 } F^!O\8PFd  
} l?J[K  
g +gcH  
void CCaptureDlg::OnPaint() OiZ-y7;k^  
{ '@#(jY0_  
 if (IsIconic()) ~-lUS0duh  
 { )c9Xp:  
  CPaintDC dc(this); // device context for painting !J<0.nO/:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); = B;qy7?  
  // Center icon in client rectangle P~:^bU^F7  
  int cxIcon = GetSystemMetrics(SM_CXICON); )t-P o'RW  
  int cyIcon = GetSystemMetrics(SM_CYICON); _1$Y\Y  
  CRect rect; yW7>5r  
  GetClientRect(&rect); rZ-< Ryg  
  int x = (rect.Width() - cxIcon + 1) / 2; 1)ij*L8k  
  int y = (rect.Height() - cyIcon + 1) / 2; tlvZy+Blv  
  // Draw the icon E2cZk6~m{  
  dc.DrawIcon(x, y, m_hIcon); ZK'WKC  
 } 4s_5>r4  
 else ]K>bSK^TX  
 { z%+rI  
  CDialog::OnPaint(); [U^Cz{G  
 }  ;ud"1wH  
} b|kL*{;  
`uusUw-Gf  
HCURSOR CCaptureDlg::OnQueryDragIcon() z+wegF  
{ c>/7E-T  
 return (HCURSOR) m_hIcon; '3Fb[md54  
} N:+EGmp  
a x;<idC}  
void CCaptureDlg::OnCancel() T5T[$%]6  
{ T<Zi67QC@  
 if(bTray) 5i'?oXL  
  DeleteIcon(); L5KcI  
  CDialog::OnCancel(); KY%qzq,n  
} 9X33{  
Tl-%;X<X  
void CCaptureDlg::OnAbout() ?g@X+!RB  
{ =<aFkBX-  
 CAboutDlg dlg; 7!Im|7Ty  
 dlg.DoModal(); ttlMZLX{TJ  
} Y@MxKKuj  
UM21Cfqex  
void CCaptureDlg::OnBrowse() kqo4 v;r  
{ :2vuc!Pu  
 CString str; i7YUyU  
 BROWSEINFO bi; OR|Jc+LT  
 char name[MAX_PATH]; b~)2`l  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); E|_8#xvb  
 bi.hwndOwner=GetSafeHwnd(); c`lL&*]  
 bi.pszDisplayName=name; /FPO'} 6i  
 bi.lpszTitle="Select folder"; [GI2%uA0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; sVmqx^-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *u,&?fCl  
 if(idl==NULL) I7Abf7>*Q  
  return; 5t_Dt<lIz  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Rm$(X5x>o  
 str.ReleaseBuffer(); >nvK{6xR:  
 m_Path=str; JHZjf7g$k  
 if(str.GetAt(str.GetLength()-1)!='\\') Sz1J4$5  
  m_Path+="\\"; q?]KZ_a  
 UpdateData(FALSE); aAn p7\7  
} MMD=4;X  
\xC#Zs[<  
void CCaptureDlg::SaveBmp() .Xe_Gp"x  
{ `0q=Z],  
 CDC dc; 7z/O#Fbs  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4:b'VHW.  
 CBitmap bm; RwrRN+&s\  
 int Width=GetSystemMetrics(SM_CXSCREEN); z?|bs?HKS  
 int Height=GetSystemMetrics(SM_CYSCREEN); _;S~nn  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .i|nn[H &  
 CDC tdc; #(+V&< K  
 tdc.CreateCompatibleDC(&dc); -*J!Ws(9  
 CBitmap*pOld=tdc.SelectObject(&bm); e?O$`lf  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %i?v)EW  
 tdc.SelectObject(pOld); gCVOm-*:  
 BITMAP btm; $cm 9xW&  
 bm.GetBitmap(&btm); >/%XP_q%`e  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }rs>B,=*k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); RVs=s}|>*  
 BITMAPINFOHEADER bih; psz0q|  
 bih.biBitCount=btm.bmBitsPixel; :+ 1Wmg  
 bih.biClrImportant=0; $ZB`4!JxG  
 bih.biClrUsed=0; W* v3B.  
 bih.biCompression=0; ZU z7h^3@  
 bih.biHeight=btm.bmHeight; C,LosAd  
 bih.biPlanes=1; NB.'>Sar  
 bih.biSize=sizeof(BITMAPINFOHEADER); #67 7,dn  
 bih.biSizeImage=size; ;7H^;+P  
 bih.biWidth=btm.bmWidth; %AWc`D  
 bih.biXPelsPerMeter=0; mZM7 4!4X  
 bih.biYPelsPerMeter=0; ]TcQGW@'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [io|qLr}\  
 static int filecount=0; :B7U),T  
 CString name; #!#s7^%K&  
 name.Format("pict%04d.bmp",filecount++); m] -cRf)9  
 name=m_Path+name; p_EM/jI,  
 BITMAPFILEHEADER bfh; a <F2]H=J  
 bfh.bfReserved1=bfh.bfReserved2=0; 0B}2~}#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 0O]v|  
 bfh.bfSize=54+size; ;, \!&o6  
 bfh.bfOffBits=54; "oF)u1_?  
 CFile bf; =1 S%E  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Wa&!1' @  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 88?O4)c  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )24M?R@r  
  bf.WriteHuge(lpData,size); !gfd!R  
  bf.Close(); aS\$@41"  
  nCount++; tB(~:"|8  
 } %p&y/^=0I  
 GlobalFreePtr(lpData); zf^|H% ~^  
 if(nCount==1) /Ah&d@b  
  m_Number.Format("%d picture captured.",nCount); ^kz(/c/?  
 else L$kB(Brw  
  m_Number.Format("%d pictures captured.",nCount); ?gjx7TQ?  
  UpdateData(FALSE); v#X#F9C  
} 8B(v6(h  
Z`ww[Tbv~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k{UeY[,jb  
{ b&LAk-}[  
 if(pMsg -> message == WM_KEYDOWN) O(D2F$VlL  
 { BIe:7cR%  
  if(pMsg -> wParam == VK_ESCAPE) 39F e#u  
   return TRUE; =1,1}OucP  
  if(pMsg -> wParam == VK_RETURN) ]bpgsW:Xu  
   return TRUE; yq^Ma  
 } n%4/@M  
 return CDialog::PreTranslateMessage(pMsg); (-&d0a9N  
} hv\Dz*XTs0  
Y| ch ;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <l5m\A  
{ jcBZ#|B7;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n5IQKYr g  
  SaveBmp(); /m 7~-~$V  
  return FALSE; qE]e+S?57a  
} $z 5kA9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;_E|I=%'E  
 CMenu pop; %:;g|PC  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P*VZ$bUe5@  
 CMenu*pMenu=pop.GetSubMenu(0); zZ<*  
 pMenu->SetDefaultItem(ID_EXITICON); ~vM99hW  
 CPoint pt; }@tgc?C D  
 GetCursorPos(&pt); > '. : Acn  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rzLW @k  
 if(id==ID_EXITICON) zEukEA^9`  
  DeleteIcon(); {s*2d P)  
 else if(id==ID_EXIT) !=a]Awr\  
  OnCancel(); 8?YeaMIBB  
 return FALSE; q(~|roKA(  
}  jIH^  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); jiLJiYMg  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "dvo@n|  
 AddIcon(); ;YW@ 3F-h  
 return res; VYO1qj  
} lCl5#L9  
w&Gc#-B  
void CCaptureDlg::AddIcon() V{A`?Jl6{  
{ Qf}.=(  
 NOTIFYICONDATA data; 8Gnf_lkI  
 data.cbSize=sizeof(NOTIFYICONDATA); \[^! ys  
 CString tip; X;l/D},.  
 tip.LoadString(IDS_ICONTIP); kLU-4W5t  
 data.hIcon=GetIcon(0); ;DR5?N/a  
 data.hWnd=GetSafeHwnd(); af9KtX+  
 strcpy(data.szTip,tip); JEMc_ngR!  
 data.uCallbackMessage=IDM_SHELL; )c'E9ZuZ>d  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m]8*k=v  
 data.uID=98; W\;|mEEu  
 Shell_NotifyIcon(NIM_ADD,&data); ACZK]~Y'N*  
 ShowWindow(SW_HIDE); VY+P c/b  
 bTray=TRUE; (}.MB3`#C  
} p3{Ff5FZ  
DZ\K7-  
void CCaptureDlg::DeleteIcon() N@}h  
{ ?2dI8bG  
 NOTIFYICONDATA data; YhS_ ,3E  
 data.cbSize=sizeof(NOTIFYICONDATA); ^m&P0  
 data.hWnd=GetSafeHwnd(); u#Jr_ze  
 data.uID=98; 32%Fdz1S  
 Shell_NotifyIcon(NIM_DELETE,&data); *h3iAcM8  
 ShowWindow(SW_SHOW); K5 BL4N  
 SetForegroundWindow(); kV4Oq.E  
 ShowWindow(SW_SHOWNORMAL); $uyx  
 bTray=FALSE; 7Zd g314  
} -57~7 <N  
9:-7.^`P  
void CCaptureDlg::OnChange() }f?[m&<  
{ E]GbLU;TH  
 RegisterHotkey(); A~<!@`NjB  
} [(5.?  
`&OX|mL^w  
BOOL CCaptureDlg::RegisterHotkey() } e+`Kxy  
{ 0`-b57lF&  
 UpdateData(); DZnqCu"J  
 UCHAR mask=0; %DXBl:!Y`  
 UCHAR key=0; A8Fe@$<#8  
 if(m_bControl) Vd  d  
  mask|=4; HK~SD:d  
 if(m_bAlt) W{tZX^|  
  mask|=2; #u8#< ,w  
 if(m_bShift) 9q_{_%G%  
  mask|=1; =W:=}ODD  
  key=Key_Table[m_Key.GetCurSel()]; ?6`B;_m  
 if(bRegistered){ kROIVO1|`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); cy;i1#1rO  
  bRegistered=FALSE; s8>y&b.  
 } $D!/v)3  
 cMask=mask; 2b^Fz0 w4  
 cKey=key; rqqd} kA  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *q k7e[IP  
 return bRegistered; liH#=C8l*%  
} 'Kbrz  
wL="p) TO.  
  四、小结 /W BmR R  
QDJ "X  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八