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
  • 7201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: %GHGd'KO&  
  7;s#QqG`I  
  一、实现方法 {_QdB;VwH  
1u 9hA~rj  
  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: '+`[)w  
c+ oi8G  
#pragma data_seg("shareddata") TmsIyDcD~  
HHOOK hHook =NULL; //钩子句柄 /|IPBU 5  
UINT nHookCount =0; //挂接的程序数目 vrkY7L3\  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X2z<cJG|d@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 rO'DT{Yt  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5~L]zE  
static int KeyCount =0; =]Vz= <  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |A%9c.DG.  
#pragma data_seg()  lN,?N{6s  
j]Jgz<  
  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。 BAf$ty h  
8]ZzO(=@{  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: .T| }rB<c  
0zaK&]oY0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A&Y5z[p  
cKey,UCHAR cMask) ;mkkaW,D*  
{ x HRSzYn$  
 BOOL bAdded=FALSE; bGPE0}b  
 for(int index=0;index<MAX_KEY;index++){ l/&.HF  
  if(hCallWnd[index]==0){ LQ jbEYp  
   hCallWnd[index]=hWnd; ={qcDgn~C  
   HotKey[index]=cKey; eU[g@Pq:Y  
   HotKeyMask[index]=cMask; o*S_"  
   bAdded=TRUE; \^x{NV@v42  
   KeyCount++; $ik*!om5  
   break; P {TJ$  
  } ,/42^|=Z6O  
 } /Mqhx_)>A  
 return bAdded; `(e :H  
} :D D<0  
//删除热键 Lo%n{*if  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WYw#mSp  
{ lW+mH=  
 BOOL bRemoved=FALSE; -(qRC0V  
 for(int index=0;index<MAX_KEY;index++){ NRi5 Vp2=  
  if(hCallWnd[index]==hWnd){ &Y{^yb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }LzBo\  
    hCallWnd[index]=NULL; JVZ-nHf(9  
    HotKey[index]=0;  I//=C6  
    HotKeyMask[index]=0;  {>]\<  
    bRemoved=TRUE; p3I"LY  
    KeyCount--; 3JCo!n0   
    break; ]&cnc8tC  
   } :xd;=;q5  
  } . %RM8  
 } 1Kg0y71"  
 return bRemoved; f7Gn$E|/r;  
} d1b] +AG4  
;cor\ R  
o NtFYY  
  DLL中的钩子函数如下:  : T*Q2  
BOs/:ZbK0W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Shm> r@C?  
{ / ^.|m3  
 BOOL bProcessed=FALSE; KZm&sk=QM-  
 if(HC_ACTION==nCode) _yg_?GH  
 { ^L[:DB{Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2jsbg{QS#_  
   switch(wParam) =BJe)!b  
   {  <W4F`6`x  
    case VK_MENU: $v^hzC  
     MaskBits&=~ALTBIT; -@orIwA&  
     break; %TB(E<p`  
    case VK_CONTROL: I6>J.6luF9  
     MaskBits&=~CTRLBIT; RK3y q$  
     break; $l7^-SK`E  
    case VK_SHIFT: 8Zv``t61  
     MaskBits&=~SHIFTBIT; uqMw-f/  
     break; $ [gN#QW%  
    default: //judge the key and send message Y'v[2s  
     break; ] lB zpD  
   } 5xQ-f  
   for(int index=0;index<MAX_KEY;index++){ >=~\b  
    if(hCallWnd[index]==NULL) $ghZ<Y2}9  
     continue; }3pM,.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @<.@ X*#I  
    { Gw M:f/eV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (3#PKfY+  
     bProcessed=TRUE; 5KCB^`|b>t  
    } nxLuzf4U5  
   } QV;o9j  
  } e+ xQ\LH  
  else if((lParam&0xc000ffff)==1){ //有键按下 Sj9fq*  
   switch(wParam) jr6_|(0 i6  
   { )vp0X\3q`  
    case VK_MENU: v+c>iI  
     MaskBits|=ALTBIT; 9&6juL  
     break; %uW  =kr  
    case VK_CONTROL: gP^2GnjHL8  
     MaskBits|=CTRLBIT; Dg&84,bv^  
     break; jL VJ+mu  
    case VK_SHIFT: 1W^hPY  
     MaskBits|=SHIFTBIT; 6{Wo5O{!\  
     break; f :c'j`  
    default: //judge the key and send message 8|u4xf<  
     break; Z;BS@e  
   } |P|B"I<?  
   for(int index=0;index<MAX_KEY;index++){ Bo 35L:r|  
    if(hCallWnd[index]==NULL) PwY/VGT  
     continue; 'ofj1%c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v^|U?  
    { ,:_c-d#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h$cm:uks  
     bProcessed=TRUE; R4?>C-;  
    } 7|rH9Bc{U  
   } tne_]+  
  } sZ;|NAx)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D6 B-#u!M  
   for(int index=0;index<MAX_KEY;index++){ @^{Hq6_`  
    if(hCallWnd[index]==NULL) 2 $>DX\h  
     continue; Q7%4`_$!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b 2gng}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h Yu6PWK  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z;0~f<e%  
   } X{9^$/XsJ  
  } q z)2a2C  
 } a#oROb-*~  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  Fr%#  
} r pNb.  
.`or^`X3  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: [ks_wvY:'  
y^. 66BH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *}[\%u$ T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }Zhe%M=}G  
RLF&-[mr3  
  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: GES}o9?#  
 rxY|&!f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }@DCcf$<  
{ ) SV.|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `lf_wB+I  
 { kA :Y^2X'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !_W:%t)g  
  SaveBmp(); blO4)7m  
  return FALSE; 2q f|+[X  
 } @gUp9ZwtH  
 …… //其它处理及默认处理 Na\ZV|;*tu  
} j3-YZKpg  
`Sod]bO +U  
b3(* /KgK  
  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。 Y&|Z*s+ +}  
m5Bf<E,c  
  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。 b R\7j+*&  
XS<>0YM  
  二、编程步骤 $vn6%M[  
3JazQU  
  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"; #3uv^m LGa  
(vXr2Z<l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Sp `l>BL  
FO{=^I5YA  
  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; ycA<l"  
PKm|?kn{0(  
  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; $l.*;h*  
qwTz7r  
  5、 添加代码,编译运行程序。 r]B8\5|<d  
8}/DD^M  
三、程序代码 0G%9 @^B  
s!6lZ mPM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL n#_B4UqW%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) u{1R=ML  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "ra$x2|=}  
#if _MSC_VER > 1000 9QZaa(vN  
#pragma once lu utyK!  
#endif // _MSC_VER > 1000 qF)J#$4;6  
#ifndef __AFXWIN_H__ u?').c4  
#error include 'stdafx.h' before including this file for PCH awLvLkQb{  
#endif pEyZH!W  
#include "resource.h" // main symbols I&PJ[U#~a  
class CHookApp : public CWinApp )f8>kz(  
{ h]7_ N,  
 public: y\Wn:RR1[  
  CHookApp(); 2+]5}'M  
  // Overrides ,EqQU|  
  // ClassWizard generated virtual function overrides *v<f#hB"  
  //{{AFX_VIRTUAL(CHookApp) HU0.)tD  
 public: #G9 W65f  
  virtual BOOL InitInstance(); sz7*x{E  
  virtual int ExitInstance(); kc'$4 J4Tw  
  //}}AFX_VIRTUAL %VHy?!/  
  //{{AFX_MSG(CHookApp) DP_b9o \5  
  // NOTE - the ClassWizard will add and remove member functions here. Iix,}kzss  
  // DO NOT EDIT what you see in these blocks of generated code ! r&=ulg  
  //}}AFX_MSG ,BdObx  
  DECLARE_MESSAGE_MAP() jkeerU6  
}; X$};K \I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W'G|sk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d_[H|H9i6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1(' wg!  
BOOL InitHotkey(); %-hSa~20  
BOOL UnInit(); uWS]l[Ga  
#endif )Q2Ap&  
[@$ SLl^Y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]:%DDlRb  
#include "stdafx.h" ?G{0{ c2  
#include "hook.h" >t+ ENYb  
#include <windowsx.h> &61U1"&$R  
#ifdef _DEBUG <^S\&v1C_  
#define new DEBUG_NEW Bc>j5^)8w  
#undef THIS_FILE m\teE]8x  
static char THIS_FILE[] = __FILE__; "O$bq::(]e  
#endif G?4@[m  
#define MAX_KEY 100 O]:9va  
#define CTRLBIT 0x04 t FU4%c7V  
#define ALTBIT 0x02 k@xinK%O{  
#define SHIFTBIT 0x01 EKc<|e,F  
#pragma data_seg("shareddata") _|~Dj)z  
HHOOK hHook =NULL; =<\22d5L  
UINT nHookCount =0; R~<N*En~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :>-zT[Lcn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XQ1]F{?/H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 18$d-[hX  
static int KeyCount =0; H3wJ5-q(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift q@.>eB'92P  
#pragma data_seg() IIk_!VzT  
HINSTANCE hins; jN6V`Wh_  
void VerifyWindow(); Lf_Y4a#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) n%Oi~7>  
//{{AFX_MSG_MAP(CHookApp) pl8b&bLzi  
// NOTE - the ClassWizard will add and remove mapping macros here. ~cU1 /CW8  
// DO NOT EDIT what you see in these blocks of generated code! d+n2 c`i  
//}}AFX_MSG_MAP {lK2yi  
END_MESSAGE_MAP() <ZT C^=3  
t{;2$z 0  
CHookApp::CHookApp() h!tpi`8\z  
{ WZa6*pF  
 // TODO: add construction code here, -TD\?Q  
 // Place all significant initialization in InitInstance ]*dYX=6  
} s|IBX0^@  
OvH:3 "Sdy  
CHookApp theApp; EBhdP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) # epP~J_f  
{ wv~:^v'  
 BOOL bProcessed=FALSE; @Y0ZW't  
 if(HC_ACTION==nCode) 9nY`rF8@  
 {  \? /'  
  if((lParam&0xc0000000)==0xc0000000){// Key up Whd >  
   switch(wParam) X5owAc6  
   { $Sc_E:`]  
    case VK_MENU: j"Jf|Hq $  
     MaskBits&=~ALTBIT; Z+B*V )a=  
     break; %9YY \a {  
    case VK_CONTROL: "#)|WVa=BM  
     MaskBits&=~CTRLBIT; /xX7:U b  
     break; f@}> :x  
    case VK_SHIFT: f y2vAwl  
     MaskBits&=~SHIFTBIT; w|dfl *  
     break; +~n:*\  
    default: //judge the key and send message 9]Jv >_W*  
     break; e&sH<hWR  
   } <F^9ML+'  
   for(int index=0;index<MAX_KEY;index++){ \Zf=A[  
    if(hCallWnd[index]==NULL) Byq VNz0L  
     continue; QC'Ru'8S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =A!oLe$%  
    { /? %V% n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I`{3I-E  
     bProcessed=TRUE; xLed];2G  
    } %P}H3;2  
   } P!-RZEt$  
  } b5MBzFw  
  else if((lParam&0xc000ffff)==1){ //Key down bo<P%$(D  
   switch(wParam) HMVP71  
   { yjT>bu]  
    case VK_MENU: -1Tr!I:1  
     MaskBits|=ALTBIT; AL":j6!OQ  
     break; 20I`F>-*  
    case VK_CONTROL: 2]kGDeSr  
     MaskBits|=CTRLBIT; k"#gSCW$  
     break; 4?Y7. :x  
    case VK_SHIFT: /<_!Gz.@uG  
     MaskBits|=SHIFTBIT; WIU]>_$.  
     break; !<TkX/O  
    default: //judge the key and send message zgY VB}  
     break; nlpEkq  
   } VL)<u"d4  
   for(int index=0;index<MAX_KEY;index++) H!*ypJ  
   { #E+ybwA  
    if(hCallWnd[index]==NULL) \MEBQ  
     continue; et5lfj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .I_atv  
    { bci]"uzB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <M\&zHv  
     bProcessed=TRUE; he(K   
    } E5i5gE"\  
   } N]F RL\K  
  } yF\yxdUX#  
  if(!bProcessed){  Gd A!8  
   for(int index=0;index<MAX_KEY;index++){ WVD48}HF-  
    if(hCallWnd[index]==NULL) yKhI&  
     continue; z~2{`pET  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W=HvMD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XaCvBQ  
   } u xyj6(  
  } 7c"Csq/]I  
 } R'sNMWM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .@): Uh  
} J4ZHE\  
j7)mC4o:%  
BOOL InitHotkey() N!ihj:,  
{ LEM%B??&5z  
 if(hHook!=NULL){ ?98!2:'{9  
  nHookCount++;  2d*bF.  
  return TRUE; g8cBb5(L  
 } MWme3u)D  
 else dnomnY(*<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *%/O (ohs@  
  if(hHook!=NULL) zG$5g^J  
   nHookCount++; D\G.p |9=  
  return (hHook!=NULL); /a*){JQ5j  
} F.U@8lr  
BOOL UnInit() Gtaa^mnxD  
{ j4,y+ 9U  
 if(nHookCount>1){ T1qbb*  
  nHookCount--; .1TuHC\mC  
  return TRUE; 46]BRL2 G  
 } Iuz_u2"C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~*bfS}F8I  
 if(unhooked==TRUE){ /[dMw *SRz  
  nHookCount=0; p _[,P7  
  hHook=NULL; FzEs1hpl  
 } 9287&+,0r  
 return unhooked; ^vMlRt;  
} M 6&=-  
0U~$u  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +YZo-tE  
{ sJKr%2nVV  
 BOOL bAdded=FALSE; F%<*a,m6g  
 for(int index=0;index<MAX_KEY;index++){ !`%j#bv  
  if(hCallWnd[index]==0){ XA<h,ONE?  
   hCallWnd[index]=hWnd; oi|N8a2R  
   HotKey[index]=cKey; y5F+~z }{  
   HotKeyMask[index]=cMask; KANR=G   
   bAdded=TRUE; hlL$3.]  
   KeyCount++;  FkrXM!mJ  
   break; h,FU5iK|  
  } +rU{-`dy9'  
 } IDn<5#  
 return bAdded; ;4!H- qZ  
} MlYm\x8{M  
(1|wM+)"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^+Nd\tp  
{ \t)va:y  
 BOOL bRemoved=FALSE; )YgntI@  
 for(int index=0;index<MAX_KEY;index++){ 3}FZg w .  
  if(hCallWnd[index]==hWnd){ >=97~a+.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;&<N1  
    hCallWnd[index]=NULL; la<.B^  
    HotKey[index]=0; _^Q!cB'~/`  
    HotKeyMask[index]=0; S[!6Lw  
    bRemoved=TRUE; Dx1(}D  
    KeyCount--; x)=l4A\  
    break; Eo2`Vr9g  
   } )M dddz4  
  } #1U>  
 } ]fzXrN_  
 return bRemoved; UstUPO  
} S>I` y]qlR  
K-:y  
void VerifyWindow() - (WH+  
{ h#Z[ "BG  
 for(int i=0;i<MAX_KEY;i++){ {Vj&i.2,  
  if(hCallWnd!=NULL){ w[d8#U   
   if(!IsWindow(hCallWnd)){ =V|jd'iwx  
    hCallWnd=NULL; <&Xl b0  
    HotKey=0; jUM'f24  
    HotKeyMask=0; l,hOnpm9  
    KeyCount--; Mq<ob+  
   } ;Tnid7:S  
  } `$Rgn3  
 } Hghd Ts  
} jz_Y|"{`v  
X PyDZk/m  
BOOL CHookApp::InitInstance() Qu[QcB{ro-  
{ m[xl) /e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ZN#b5I2Pf  
 hins=AfxGetInstanceHandle(); vN^.MR+<  
 InitHotkey(); V3ht:>c9qs  
 return CWinApp::InitInstance(); 1v|-+p42  
} VA[EY`8  
Hc'Pp{| X  
int CHookApp::ExitInstance() @U8u6JNK'  
{ JWd[zJ[  
 VerifyWindow(); mq[=,,#  
 UnInit(); 0Q a 0  
 return CWinApp::ExitInstance(); Y]L4,V  
} avq$aq(3&  
`sqr>QD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0#OyT'~V%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <~5O-.G]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tgKr*8t{  
#if _MSC_VER > 1000 pM@8T25=  
#pragma once GqxnB k1  
#endif // _MSC_VER > 1000 dvjj"F'Bf  
UgAp9$=z  
class CCaptureDlg : public CDialog 0]bt}rh  
{ fY9+m}$S$  
 // Construction exJc[G&t(  
 public: ^%,{R},s  
  BOOL bTray; YA$YT8iMe  
  BOOL bRegistered; ,5v'hG  
  BOOL RegisterHotkey(); =xm7i#1  
  UCHAR cKey; }qM^J;uy  
  UCHAR cMask; 6=]Gom&S  
  void DeleteIcon(); Q~nVbj?c2v  
  void AddIcon(); zEFS\nP}E  
  UINT nCount; ,e43m=KhK  
  void SaveBmp(); 'Wnh1|z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor $ 6mShp9(  
  // Dialog Data QUW`Yc  
  //{{AFX_DATA(CCaptureDlg) boEQI=!j\+  
  enum { IDD = IDD_CAPTURE_DIALOG }; S?b&4\:  
  CComboBox m_Key; N_K9H1 r  
  BOOL m_bControl; uQvTir*e  
  BOOL m_bAlt; .4\I?  
  BOOL m_bShift; Y M:9m)  
  CString m_Path; 9k ~8n9  
  CString m_Number; nDdY~f.B  
  //}}AFX_DATA ~'lT8 n_  
  // ClassWizard generated virtual function overrides IOZw[9](+  
  //{{AFX_VIRTUAL(CCaptureDlg)  q6F1Rt  
 public: < 8' b  
  virtual BOOL PreTranslateMessage(MSG* pMsg); r1< 'l  
 protected: yF(9=z"?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support A#cFO)"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); i'li;xUhZ  
  //}}AFX_VIRTUAL B za<.E=  
  // Implementation > pb}@\;:  
 protected: y!gPBkG&3n  
  HICON m_hIcon; xR0*w7YE  
  // Generated message map functions e-y$&[  
  //{{AFX_MSG(CCaptureDlg) &zF>5@fM  
  virtual BOOL OnInitDialog(); UDr 1t n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vU,7Y|t`  
  afx_msg void OnPaint(); V\zcv@  
  afx_msg HCURSOR OnQueryDragIcon(); (.P}>$M9  
  virtual void OnCancel(); `15}jTi  
  afx_msg void OnAbout(); +8zACs{p  
  afx_msg void OnBrowse(); U\lbh;9G  
  afx_msg void OnChange(); N62;@Z\7  
 //}}AFX_MSG ]|g2V a~-  
 DECLARE_MESSAGE_MAP() n{!{,s  
}; 39 }e }W"  
#endif ,;}   
w{DU<e:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "'[M~Js  
#include "stdafx.h" s`=| D'G(=  
#include "Capture.h" 9f0`HvHC  
#include "CaptureDlg.h" y[$UeE"0  
#include <windowsx.h> Bbs1U  
#pragma comment(lib,"hook.lib") 0]7jb_n1  
#ifdef _DEBUG 6Sd:5eTEQ  
#define new DEBUG_NEW M,JwoKyg  
#undef THIS_FILE }PK4 KRn  
static char THIS_FILE[] = __FILE__; P1[.[q/-e  
#endif DGGySO6=$e  
#define IDM_SHELL WM_USER+1 ivgX o'=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;xiN<f4B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )8oyo~4?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .t\J @?Z  
class CAboutDlg : public CDialog L;opQ~g  
{ ra*|HcLD  
 public: 6<W^T9}v@/  
  CAboutDlg(); h>!h|Ma  
  // Dialog Data :epBd3f  
  //{{AFX_DATA(CAboutDlg) A x8>  
  enum { IDD = IDD_ABOUTBOX }; >I@&"&d  
  //}}AFX_DATA tZ[9qms^_  
  // ClassWizard generated virtual function overrides d [l8qaD  
  //{{AFX_VIRTUAL(CAboutDlg) B bmw[Qf\  
 protected: @@\qso  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DL V ny]  
  //}}AFX_VIRTUAL ppIXS(  
  // Implementation 'Grej8  
 protected: .) tQ&2  
  //{{AFX_MSG(CAboutDlg) xMk>r1Ud  
  //}}AFX_MSG c\ZI 5&4jT  
  DECLARE_MESSAGE_MAP() X[?fU&  
}; }Y7P2W+4?  
_qPKdGoM  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]zj#X\  
{ 7fypUQ:y  
 //{{AFX_DATA_INIT(CAboutDlg) IrYj#,xJ  
 //}}AFX_DATA_INIT &I-:=ir  
} q0%QMut%  
Pxf>=kY  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >6Pe~J5,:  
{ EgG3XhfS  
 CDialog::DoDataExchange(pDX); 00;SK!+$  
 //{{AFX_DATA_MAP(CAboutDlg) ef*Z;HI0  
 //}}AFX_DATA_MAP Y`22DFO  
} ;v]C8}L^  
t"Du  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [O\ )R[J  
 //{{AFX_MSG_MAP(CAboutDlg) tLKf]5}f  
 // No message handlers 2gK]w$H7!  
 //}}AFX_MSG_MAP  Me z&@{  
END_MESSAGE_MAP() UBW,Q+Q  
y$fMMAN7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) W3/] 2"0  
: CDialog(CCaptureDlg::IDD, pParent) ]+,L/P  
{ R(0[bMr3Q  
 //{{AFX_DATA_INIT(CCaptureDlg) *P\lzM  
  m_bControl = FALSE; Zq33R`  
  m_bAlt = FALSE; a:*N0  
  m_bShift = FALSE; yH:p*|%:  
  m_Path = _T("c:\\"); ih)\P0wed  
  m_Number = _T("0 picture captured."); >{Ayzz>v  
  nCount=0; }~LGq.H  
  bRegistered=FALSE; On O_7'4 t  
  bTray=FALSE; >.UEs 8QV  
 //}}AFX_DATA_INIT DW,ERQ^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {w3<dfJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J;XO1}9  
} kJB:=iq/x$  
.7 j#F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ABoB=0.l  
{ nt_Cb*K<  
 CDialog::DoDataExchange(pDX); K+ /wJ9^B  
 //{{AFX_DATA_MAP(CCaptureDlg) fCu;n%   
  DDX_Control(pDX, IDC_KEY, m_Key); T0fm6 J  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Hj`'4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9?sY!gXc  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); J0k!&d8  
  DDX_Text(pDX, IDC_PATH, m_Path); Tr>_R%bK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9E5*%Hu_  
 //}}AFX_DATA_MAP yT<"?S>D  
} n'vdA !R  
? .B t.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T*B`8P  
//{{AFX_MSG_MAP(CCaptureDlg) 'S}3lsIE  
 ON_WM_SYSCOMMAND() hB<(~L? A]  
 ON_WM_PAINT() !_+FuF"@  
 ON_WM_QUERYDRAGICON() U7U&^s6`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 1h`F*:nva  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fif'ptK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a'HHUii=  
//}}AFX_MSG_MAP <~ay4JY  
END_MESSAGE_MAP() U43U2/^  
t^B s3;E^  
BOOL CCaptureDlg::OnInitDialog() roriNr/ e  
{ 1k"t[^  
 CDialog::OnInitDialog(); ,b^jAzow  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 30w(uF  
 ASSERT(IDM_ABOUTBOX < 0xF000); -h|[8UG^b  
 CMenu* pSysMenu = GetSystemMenu(FALSE); A+Un(tU2(  
 if (pSysMenu != NULL) p:tp |/  
 { "}0QxogYE  
  CString strAboutMenu; j-aTpN  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JI-.SR  
  if (!strAboutMenu.IsEmpty()) Qg1kF^=  
  { k=d _{2 ~  
   pSysMenu->AppendMenu(MF_SEPARATOR); n|.eL8lX.<  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zvnd@y{[  
  } , DuyPBAms  
 } mV}8s]29  
 SetIcon(m_hIcon, TRUE); // Set big icon LD WYFOGQ  
 SetIcon(m_hIcon, FALSE); // Set small icon V@z/%=PJ  
 m_Key.SetCurSel(0); w=nS*Qy 2  
 RegisterHotkey(); |w~*p N0  
 CMenu* pMenu=GetSystemMenu(FALSE); (G{:O   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); b:O_PS5h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'SE5sB  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;)f,A)(Z  
 return TRUE; // return TRUE unless you set the focus to a control =mwAbh)[7n  
} Sd I>  
{O=_c|u{N  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) BUL<FTg  
{ tG"EbWi  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c.-dwz  
 { lUnC+w#[  
  CAboutDlg dlgAbout; J8@bPS27q  
  dlgAbout.DoModal(); #K-O<:s=y  
 } )ARV>(  
 else MnY}U",   
 { N- <,wUxf  
  CDialog::OnSysCommand(nID, lParam); 04X/(74  
 } ?$\sMkn  
} R6GlQ G  
:Ef$[_S>  
void CCaptureDlg::OnPaint() N4yQ,tG>aa  
{ HZ{DlH;&  
 if (IsIconic()) 5C-n"8&C&  
 { >Zm|R|{BE  
  CPaintDC dc(this); // device context for painting vHymSU/J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <&1hJ)O  
  // Center icon in client rectangle V22Br#+  
  int cxIcon = GetSystemMetrics(SM_CXICON); f0{ tBD!%  
  int cyIcon = GetSystemMetrics(SM_CYICON); sU^K5oo  
  CRect rect; `9f7H  
  GetClientRect(&rect); Y$hLsM\%  
  int x = (rect.Width() - cxIcon + 1) / 2; ~ ^~+p  
  int y = (rect.Height() - cyIcon + 1) / 2; '<C#"2  
  // Draw the icon WH+S d  
  dc.DrawIcon(x, y, m_hIcon); (H|^Ow5  
 } eg"!.ol  
 else J<iiA:&J  
 { `LTD|0;  
  CDialog::OnPaint(); 2F,?}jJ.K  
 } unN*L  
} kkT=g^D9j  
|JUAR{  
HCURSOR CCaptureDlg::OnQueryDragIcon() $L]E< gWrP  
{ 1[Jv9S*f/  
 return (HCURSOR) m_hIcon; _>{"vY  
} hZO=$Mm4p  
}f] ~{^  
void CCaptureDlg::OnCancel() cbx( L8  
{ \xk8+=/A  
 if(bTray) }Mc&yjhMrg  
  DeleteIcon(); \T`iq[+6  
  CDialog::OnCancel(); 3)dtl!VMW[  
} hya $Vp  
PtKrks|y  
void CCaptureDlg::OnAbout() EhIa31>X  
{ sGbk4g  
 CAboutDlg dlg; 7/c9azmC  
 dlg.DoModal(); .t%` "C  
} q9m-d-!)  
")GrQv a  
void CCaptureDlg::OnBrowse() c6F8z75U  
{ >Q# !.lH$W  
 CString str; 0p \,}t\E  
 BROWSEINFO bi; 5sF?0P;ln  
 char name[MAX_PATH]; TSYe ~)I  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); E1rxuV|9  
 bi.hwndOwner=GetSafeHwnd(); pH!8vnoA  
 bi.pszDisplayName=name; I/w=!Ih  
 bi.lpszTitle="Select folder"; xcu:'7'K[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7{DSLKtN  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F5EsaF'e4  
 if(idl==NULL) zF=E5TL-,4  
  return; 5Og=`T  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 75#&hi/~  
 str.ReleaseBuffer(); ' +[fJ>Le  
 m_Path=str; !T8h+3 I  
 if(str.GetAt(str.GetLength()-1)!='\\') hj-#pL-t  
  m_Path+="\\"; %'i`Chc^!;  
 UpdateData(FALSE); w 7 j hS  
} 6):^m{RH^  
x*z$4)RP  
void CCaptureDlg::SaveBmp() El`f>o+EJ  
{ C Ejf&n  
 CDC dc; h"+|)'*n  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _^pg!j[Fy}  
 CBitmap bm; =M+enSu  
 int Width=GetSystemMetrics(SM_CXSCREEN); zkRL'-  
 int Height=GetSystemMetrics(SM_CYSCREEN); `$, \B  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d|(@#*{T]  
 CDC tdc; -& \?Q_6  
 tdc.CreateCompatibleDC(&dc); a8!/V@a  
 CBitmap*pOld=tdc.SelectObject(&bm); N=P+b%%:Z  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F`\7&'I  
 tdc.SelectObject(pOld); ZI'Mr:z4  
 BITMAP btm; A#B6]j)  
 bm.GetBitmap(&btm); Yhkn(k2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^l"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {:r8X  
 BITMAPINFOHEADER bih; c'r7sI%Yi  
 bih.biBitCount=btm.bmBitsPixel; qdeS*r p\  
 bih.biClrImportant=0; -P>f2It  
 bih.biClrUsed=0; ;F!wyTF>}  
 bih.biCompression=0; 4TW>BA  
 bih.biHeight=btm.bmHeight; d;10[8:5=  
 bih.biPlanes=1; R@)L@M)u;  
 bih.biSize=sizeof(BITMAPINFOHEADER); Vr=c06a2  
 bih.biSizeImage=size; U[ $A=e?\Y  
 bih.biWidth=btm.bmWidth; N [iv.B  
 bih.biXPelsPerMeter=0; ,5L[M&5  
 bih.biYPelsPerMeter=0; qhiO( !jK  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z#lZn!EbK  
 static int filecount=0; 4-:TQp(  
 CString name; GGR hM1II  
 name.Format("pict%04d.bmp",filecount++); ' cx&:s  
 name=m_Path+name; zT5@wm  
 BITMAPFILEHEADER bfh; ,TAzJ  
 bfh.bfReserved1=bfh.bfReserved2=0; z"C+r'39d=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^SouA[  
 bfh.bfSize=54+size; #D-L>7,jA  
 bfh.bfOffBits=54; $`&uu  
 CFile bf; >=_Z\ wA  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bQ" w%!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ux Yb[Nbc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l}$Pv?T,2  
  bf.WriteHuge(lpData,size); Ox` +Z0)a  
  bf.Close(); ? }2]G'7?  
  nCount++; KF"&9nB  
 } )NwIEk>Tf  
 GlobalFreePtr(lpData); 2Rp5 E^s  
 if(nCount==1) "c6(=FFq  
  m_Number.Format("%d picture captured.",nCount); EfR3$sp  
 else Q`dzn=  
  m_Number.Format("%d pictures captured.",nCount); *jps}uk<  
  UpdateData(FALSE); R~$W  
} :n:Gr?  
j#TtY|Po  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /=zzym~<>  
{ ]8|cV GMa  
 if(pMsg -> message == WM_KEYDOWN) EPQ~V  
 { d85\GEF9i  
  if(pMsg -> wParam == VK_ESCAPE) 8\BCC1K  
   return TRUE; G &'eP  
  if(pMsg -> wParam == VK_RETURN) Xi]WDH \  
   return TRUE; Mb6 #97  
 } yB&+2  
 return CDialog::PreTranslateMessage(pMsg); mr+J#  
} ydCVG,"  
R0R Xw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KB$s7S"=  
{ GT[,[l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !H`Q^Xf}  
  SaveBmp(); BTXS+mvl  
  return FALSE; [/}y!;3iXM  
} %E95R8SL  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :GU6v4u  
 CMenu pop; edh?I1/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?NZKu6  
 CMenu*pMenu=pop.GetSubMenu(0); }*{@-v|_R  
 pMenu->SetDefaultItem(ID_EXITICON); }nDKSC/[V!  
 CPoint pt; -uDB#?q:W  
 GetCursorPos(&pt); E$-u:Z<-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2 0Xqs,  
 if(id==ID_EXITICON) e Ir|%  
  DeleteIcon(); }s_'q~R  
 else if(id==ID_EXIT) mJ=3faM  
  OnCancel(); y9?~^pTx  
 return FALSE; ?=:wIMV  
} SMr ]Gf.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -9XB.)\#  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D"WqJcDt  
 AddIcon(); z z@;UbD"  
 return res; &TqY\l  
} 6&o9mc\I  
uqy b  
void CCaptureDlg::AddIcon() cTO\Vhg  
{ @V/Lqia  
 NOTIFYICONDATA data; z~TG~_s  
 data.cbSize=sizeof(NOTIFYICONDATA); h)[{{JSf  
 CString tip; sd;J(<Ofh  
 tip.LoadString(IDS_ICONTIP); ecK{+Z'G  
 data.hIcon=GetIcon(0);  (f DA  
 data.hWnd=GetSafeHwnd(); G.2ij%Zz  
 strcpy(data.szTip,tip); ?@U7tNI  
 data.uCallbackMessage=IDM_SHELL; U$[C>~r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q2* G86  
 data.uID=98; jseyT#2  
 Shell_NotifyIcon(NIM_ADD,&data); :DP%>H|  
 ShowWindow(SW_HIDE); nJJ9>#<g$  
 bTray=TRUE; %vjLw`  
} zGrUl|j  
/ ,3,l^kZ  
void CCaptureDlg::DeleteIcon() G=lcKtMdg  
{ Hl"qLrb4  
 NOTIFYICONDATA data; dmHpF\P5f  
 data.cbSize=sizeof(NOTIFYICONDATA); |oq27*ix~m  
 data.hWnd=GetSafeHwnd(); 4q"x|}a  
 data.uID=98; ^h+,Kn0@  
 Shell_NotifyIcon(NIM_DELETE,&data); Yqs N#E3pf  
 ShowWindow(SW_SHOW); G[4TT#  
 SetForegroundWindow(); S Rs~p  
 ShowWindow(SW_SHOWNORMAL); X {,OP/  
 bTray=FALSE; PI>PEge!&  
} ?CB*MWjd  
TrxZS_  
void CCaptureDlg::OnChange() j4wcxZYY~  
{ ,?Pn-aC +  
 RegisterHotkey(); d,}fp)  
} q\Cg2[nn2  
a []Iz8*6e  
BOOL CCaptureDlg::RegisterHotkey() v)|[=  
{ & 2MI(9v  
 UpdateData(); csg:# -gE  
 UCHAR mask=0; K31G>k@  
 UCHAR key=0; t^0^He$Ot  
 if(m_bControl) L,*KgLG  
  mask|=4; %liu[6_  
 if(m_bAlt) +Hz});ix<  
  mask|=2; Mq-QWx"P  
 if(m_bShift) (lwrk(  
  mask|=1; <rUH\z5cP  
  key=Key_Table[m_Key.GetCurSel()]; QUL^]6$  
 if(bRegistered){ @OOnO+g  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7n*,L5%?]4  
  bRegistered=FALSE; 9-;ujl?{  
 } R<VNbm;  
 cMask=mask; [%(}e1T(  
 cKey=key; ]M AB  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,-PzUR4_Kj  
 return bRegistered; gakmg#ki  
} qms+s~oA  
70,V>=aJ  
  四、小结 Ov1$7 r@  
/0Q=}:d  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八