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
  • 5907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: b'1/cY/!  
  *[XN.sb8E  
  一、实现方法 GapX$Jb,p  
Fh*q]1F  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: XHwZ+=v  
HV#?6,U}  
#pragma data_seg("shareddata") O>)n*OsS  
HHOOK hHook =NULL; //钩子句柄 ;m2"cL>{l  
UINT nHookCount =0; //挂接的程序数目 }I` ku.@5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zsR  wF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hX{g]KE>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ==PQ-Ia  
static int KeyCount =0; V{ 4i$'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 B}l}Aq8  
#pragma data_seg() S,d ngb{  
jQH5$  
  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。 =B3!jir  
FFD*e-i  
  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: ,qBnqi[  
j SUAU}u!M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR PHe~{"|d?  
cKey,UCHAR cMask) o O{|C&A  
{ LaEX kb*s  
 BOOL bAdded=FALSE; l^!0|/Vw  
 for(int index=0;index<MAX_KEY;index++){ 1FXzAc(c!  
  if(hCallWnd[index]==0){ z=- 8iks|  
   hCallWnd[index]=hWnd; [[.&,6  
   HotKey[index]=cKey; 1@1+4P0NF[  
   HotKeyMask[index]=cMask; U|y;b+n`  
   bAdded=TRUE; 3:02`;3  
   KeyCount++; b.w(x*a  
   break; '&_y*"/c  
  } oHc-0$eMKY  
 } ,=q7}5o Y  
 return bAdded; #XYLVee,  
} xv(xweV+d  
//删除热键 Kq@m?h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [Ls2k&)0  
{ )Rm 'YmO  
 BOOL bRemoved=FALSE; `E4!u=%  
 for(int index=0;index<MAX_KEY;index++){ g:uaI  
  if(hCallWnd[index]==hWnd){ ctwhfS|Y0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]HZa:aPY  
    hCallWnd[index]=NULL; '<{oYXZW3  
    HotKey[index]=0; f:JYG]E&  
    HotKeyMask[index]=0; 2F*Dkv  
    bRemoved=TRUE; g-{<v4NGI  
    KeyCount--; Aoy1<8WP%  
    break; .zSimEOF  
   } l1iF}>F2  
  } %BKR}  
 } N('S2yfDR  
 return bRemoved; )N%1%bg^-  
} FS]+s>  
H( DVVHx  
hK9t}NE.O  
  DLL中的钩子函数如下: F] dd>#  
?Uy*6YS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) dl3LDB  
{ /!&b'7y  
 BOOL bProcessed=FALSE; edImrm1f  
 if(HC_ACTION==nCode) 99+/W*C  
 { NdXy% Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X'3`Q S:!  
   switch(wParam) 4E>/*F!  
   {  2gC&R1 H  
    case VK_MENU: 0x9F*i_  
     MaskBits&=~ALTBIT; f@xfb ie !  
     break; k1LtqV  
    case VK_CONTROL: 4 L~;>]7  
     MaskBits&=~CTRLBIT; )2<B$p  
     break; ]%Q]C 8[C  
    case VK_SHIFT: 71n uTE%!  
     MaskBits&=~SHIFTBIT; w7*b}D@65\  
     break; BF1O|Q|d6  
    default: //judge the key and send message ~gLEhtW  
     break; w'zO(6 `  
   } )2^/?jK  
   for(int index=0;index<MAX_KEY;index++){ 8ZDqqz^C0  
    if(hCallWnd[index]==NULL) 0u&?Zy9&  
     continue; 6GrMcI@hS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }:c,S O!  
    { Z+h7 0,|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ja,L)b:  
     bProcessed=TRUE; uX5 --o=C  
    } PE6u8ZAb"  
   } b1 ['uJF  
  } Ow .)h(y/  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ppo^qb  
   switch(wParam) ,ov v  
   { Zy+QA>d|  
    case VK_MENU: g]PLW3  
     MaskBits|=ALTBIT; ,h(f\h(9  
     break; JXy667_  
    case VK_CONTROL: #3:'lGBIK  
     MaskBits|=CTRLBIT; v BeU  
     break; C$re$9U  
    case VK_SHIFT: yM#trqv5  
     MaskBits|=SHIFTBIT; f29HQhXqS  
     break; @!O&b%8X%  
    default: //judge the key and send message y\f8Ird  
     break; 51;%\@=  
   }  [k&s!Qp  
   for(int index=0;index<MAX_KEY;index++){ rEpKX  
    if(hCallWnd[index]==NULL) vdFQf ^l  
     continue; .T$9Q Ar5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !y2h`ZAZ  
    { YQ8x6AJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (!&O4C5  
     bProcessed=TRUE; XX5(/#  
    } YT%SCaU  
   } \$\(9!=  
  } l<MCmKuYp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZD] '$  
   for(int index=0;index<MAX_KEY;index++){ q$2taG}  
    if(hCallWnd[index]==NULL) *,*:6^t  
     continue; H1ui#5n2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d# ?* 62  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /wRK[i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &#b>AAx$2Y  
   } <~8f0+"  
  } PG~m-W+  
 } #uw*8&%0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fdEj#Ux<H  
} g:e8i~  
t T/*ZzMq#  
  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: 6;c{~$s~[  
YU\t+/b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +7vh__  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xg1r 3  
ve]95w9J  
  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: w.F3o4YP  
u'n%BVt   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xXh]z |  
{ Bma|!p{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4hr+GO@o(  
 { g8 *|" {  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `3s-%>  
  SaveBmp(); *x` l1o  
  return FALSE; =Q 0 )t_z_  
 } *oJ>4S  
 …… //其它处理及默认处理 5lA 8e  
} ^@w1Z{:  
8lb `   
::b;4Q L  
  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。 /<Nt$n  
$gtT5{"PN(  
  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。 KUn5S&eB  
7Sv5fLu2  
  二、编程步骤 l:C0:m%  
!-o||rt  
  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"; &CsBG?@Z|  
R =c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #^ [N4uV  
6h*bcb#C  
  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; J3JRWy@?P  
iQR})=Q  
  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; jQlK-U=oi  
rG%_O$_dO  
  5、 添加代码,编译运行程序。 SmEd'YD!J  
p q5H{  
三、程序代码 C xN@g'  
rpI7W?hh  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2Yf;b9-k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %+JTQy  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ EHM 7=|#  
#if _MSC_VER > 1000 cmLu T/oV  
#pragma once AhZ  
#endif // _MSC_VER > 1000 c oz}VMp  
#ifndef __AFXWIN_H__ ]OUOL/J  
#error include 'stdafx.h' before including this file for PCH 0#nXxkw  
#endif I8>1RXz  
#include "resource.h" // main symbols `\uv+^x{  
class CHookApp : public CWinApp W@}5e-q)O  
{ H;te)km}  
 public: Gjh7cm>  
  CHookApp(); `^h##WaXap  
  // Overrides @G{DOxE*  
  // ClassWizard generated virtual function overrides |#kf.kN  
  //{{AFX_VIRTUAL(CHookApp) AiI# "  
 public: ~Q\ZDMTK  
  virtual BOOL InitInstance(); +~AI(h  
  virtual int ExitInstance(); 'bO? =+c  
  //}}AFX_VIRTUAL 8LKZ3Y|  
  //{{AFX_MSG(CHookApp) lL f01sa4  
  // NOTE - the ClassWizard will add and remove member functions here. ]/naH#8G  
  // DO NOT EDIT what you see in these blocks of generated code ! J}u1\Id%  
  //}}AFX_MSG \ku{-^7  
  DECLARE_MESSAGE_MAP() AlhiF\+ C  
}; a2FIFWvW  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3"%44'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xeh|u"5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TzXl ?N  
BOOL InitHotkey(); vwD(J.;  
BOOL UnInit(); DKCy h`  
#endif h--!pE+  
 ?wY.B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. gJv^v`X  
#include "stdafx.h" )ciHY6  
#include "hook.h" pLcng[  
#include <windowsx.h> _n gMC]-T  
#ifdef _DEBUG nuA!Jln_  
#define new DEBUG_NEW GlZDuU  
#undef THIS_FILE Kf5p* AI  
static char THIS_FILE[] = __FILE__; _kLoDju%  
#endif C#0Wo  
#define MAX_KEY 100 ]<= t  
#define CTRLBIT 0x04 sVnu Sm  
#define ALTBIT 0x02 #nhAW  
#define SHIFTBIT 0x01 ^;_b!7*  
#pragma data_seg("shareddata") o%5Ao?z~  
HHOOK hHook =NULL; <K'gvMG[  
UINT nHookCount =0; ( #Aq*2Z.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bV,R*C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @/iLC6QF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ti% e.p0[  
static int KeyCount =0; Uij$ eBN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K`<P^XJr  
#pragma data_seg() GUX X|W[6  
HINSTANCE hins; xFnMXh t  
void VerifyWindow(); Yl=  |P`  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) y}`%I&]n  
//{{AFX_MSG_MAP(CHookApp) !7DS  
// NOTE - the ClassWizard will add and remove mapping macros here. nQ6'yd"  
// DO NOT EDIT what you see in these blocks of generated code! }@4*0_g"Aw  
//}}AFX_MSG_MAP 4v .6_ebL  
END_MESSAGE_MAP() 5gEK$7Vp  
vX%gcs/@  
CHookApp::CHookApp() ZQ/5]]}3y  
{ eL!6}y}W  
 // TODO: add construction code here, df\>-Hl  
 // Place all significant initialization in InitInstance 9tQk/niMM5  
} jL1UPN  
eu;^h3u;b  
CHookApp theApp; Q4*cL5j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G_]mNh  
{ p(>'4#|qy  
 BOOL bProcessed=FALSE; ^j7pF.j  
 if(HC_ACTION==nCode) {BU,kjv1g  
 { D bJ(N h  
  if((lParam&0xc0000000)==0xc0000000){// Key up z{x -Vfd  
   switch(wParam) mt'#j"mU  
   { "k/@tX1:R  
    case VK_MENU: VxoMK7'O=/  
     MaskBits&=~ALTBIT; +\Q@7Lj  
     break; f*Bc`+G  
    case VK_CONTROL: Ek0.r)Nw  
     MaskBits&=~CTRLBIT; {n'}S(  
     break; bE"CSK#  
    case VK_SHIFT: uzD{ewR/.y  
     MaskBits&=~SHIFTBIT; Mt`.|N;y!  
     break; b"b!&u  
    default: //judge the key and send message <s >SnOD  
     break; ;7hr8?M|  
   } $Izk]o;X~  
   for(int index=0;index<MAX_KEY;index++){ %h rR'*nG  
    if(hCallWnd[index]==NULL) }Of^Y@{q.  
     continue; = '[@UVH(Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5KzU&!Zh9  
    { kE}?"<l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x uF_^  
     bProcessed=TRUE; %LyB~X  
    } V ALYA=w/  
   } [<hiOB  
  } ^M"g5+ q  
  else if((lParam&0xc000ffff)==1){ //Key down RP$A"<goP  
   switch(wParam) ,*30Q  
   { H2}i .  
    case VK_MENU: f?QD##~;  
     MaskBits|=ALTBIT; !Fi)-o  
     break; {Bx\Z0+'&  
    case VK_CONTROL: hSmM OS{  
     MaskBits|=CTRLBIT; A6VkVJZx  
     break; >e%Po,Fg$  
    case VK_SHIFT: <V{BRRx  
     MaskBits|=SHIFTBIT; QHK$  
     break; aUV>O`|_  
    default: //judge the key and send message \JchcQ  
     break; n$QFj'  
   } ,bJx| K  
   for(int index=0;index<MAX_KEY;index++) &* iiQ3  
   { tp7fmn*  
    if(hCallWnd[index]==NULL) )XFMlSx)  
     continue; <Bwu N,}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +7w>ujeeJA  
    { tH(Z9\L7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); O?_'6T  
     bProcessed=TRUE; qyto`n7  
    } FB""^IC?W  
   } G>j/d7  
  } u|E,Wy1  
  if(!bProcessed){ d hy=x  
   for(int index=0;index<MAX_KEY;index++){ +;T%7j"wz  
    if(hCallWnd[index]==NULL) Z:}^fZP  
     continue; 4(NI-|q0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?d 4_'y   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YA jk'  
   } PNq#o%q  
  }  f!<mI8H  
 } Kmtr.]Nj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ts ] +W!:  
} 1EN5ZN,  
W!g ,  
BOOL InitHotkey() !**q20-aP  
{ tB[K4GNSQ  
 if(hHook!=NULL){ R)v`ZF,/b  
  nHookCount++; 8cHZBM7'  
  return TRUE; V+Z22  
 } ;8!D8o(+  
 else +=O:z *O  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;iEqa"gO  
  if(hHook!=NULL) E_? M&  
   nHookCount++; P VPwYmte  
  return (hHook!=NULL); ;Zw28!#Rt  
} u^uW<.#z  
BOOL UnInit() |R4](  
{ x/ez=yd*l  
 if(nHookCount>1){ xucV$[f  
  nHookCount--; 5HB4B <2  
  return TRUE; aaBBI S  
 } S"dQ@r9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $8s&=OW  
 if(unhooked==TRUE){ oq|K:<l  
  nHookCount=0; -Bc.<pFqp  
  hHook=NULL; *oF{ R^  
 } rpvm].4  
 return unhooked; L:31toGK  
} _T1e##Sq,  
y Le5,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  :sf;Fq  
{ ixp%aRRP  
 BOOL bAdded=FALSE; ;J4_8N-  
 for(int index=0;index<MAX_KEY;index++){ `f (!i mN  
  if(hCallWnd[index]==0){ ,Vogo5~X  
   hCallWnd[index]=hWnd; R75sK(oS  
   HotKey[index]=cKey; 54k Dez  
   HotKeyMask[index]=cMask; >+1bTt/-F  
   bAdded=TRUE; TnC'<zm9 !  
   KeyCount++; x@/ !H<y  
   break; S +He  
  } tIg_cY_y  
 } 3TJNlS  
 return bAdded; ^t| %!r G  
} cD 1p5U  
$HaM, Oh;i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  z\ \MLyS  
{ b_B4  
 BOOL bRemoved=FALSE; Aam2Y,B  
 for(int index=0;index<MAX_KEY;index++){ v>,XJ7P  
  if(hCallWnd[index]==hWnd){ G#csN&|,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !l}es4~.a  
    hCallWnd[index]=NULL; @E}4LTB  
    HotKey[index]=0; V Bg\)r[  
    HotKeyMask[index]=0; p4/D%*G^`  
    bRemoved=TRUE; ;2U`?"  
    KeyCount--; 2JbCYCTC  
    break; ej0q*TH.  
   } O)hNHIF  
  } iM\W"OUl[  
 } RW3&]l=  
 return bRemoved; s}5;)>3~@  
} B${Q Y)t  
?&[`=ZVn  
void VerifyWindow() rT x]%{  
{ >OQ<wO6  
 for(int i=0;i<MAX_KEY;i++){ ETmfy}V8  
  if(hCallWnd!=NULL){ DCHU=r  
   if(!IsWindow(hCallWnd)){ bk V_ ^8  
    hCallWnd=NULL; z 6p.{M  
    HotKey=0; Eg ;r]?|6  
    HotKeyMask=0; VlK WWQj  
    KeyCount--; O)&V}hU*  
   } Z/%>/  
  } m~2PpO  
 } T8v>J4@t  
} 1>n@`M8}  
IF<jq\M  
BOOL CHookApp::InitInstance() z+;+c$X  
{ XXO   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); huO_ARwK'  
 hins=AfxGetInstanceHandle(); -(Yq$5Zc&  
 InitHotkey(); aC;OFINK  
 return CWinApp::InitInstance(); `}18A.K  
} emTqbO  
Qv#]T,  
int CHookApp::ExitInstance() L9@nx7D  
{ B lD  
 VerifyWindow(); p2\@E} z  
 UnInit(); aCQAh[T  
 return CWinApp::ExitInstance(); "I u3&mc  
} V4_ZBeWA  
E-CZk_K9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wPyfne?~,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) caS5>wk`R  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oPl^tzO  
#if _MSC_VER > 1000 U4Il1| M&  
#pragma once :Oxrw5`=  
#endif // _MSC_VER > 1000 dtJ?J<m}  
{"-uaH>,  
class CCaptureDlg : public CDialog 3b~k)t4R  
{ J#MUtpPdQ  
 // Construction l7\Bq+Q  
 public: H|5\c=  
  BOOL bTray; Gq?JMq#  
  BOOL bRegistered; VTS8IXz  
  BOOL RegisterHotkey(); x:GuqE  
  UCHAR cKey; FK<1SOE  
  UCHAR cMask; %A%^;3@  
  void DeleteIcon(); T-0fVTeN  
  void AddIcon(); ~~z} yCl  
  UINT nCount;  `i;f  
  void SaveBmp(); <8~bb- U$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M/T ll]\|  
  // Dialog Data  BVU>M*k  
  //{{AFX_DATA(CCaptureDlg) eqV;4dhm  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y$ ZZ0m  
  CComboBox m_Key; 4~4D1  
  BOOL m_bControl; bs/Vn'CE  
  BOOL m_bAlt; 8!sl) R  
  BOOL m_bShift; JZB7?@h%  
  CString m_Path; CKCot  
  CString m_Number; 4"7/+6Z  
  //}}AFX_DATA w6aq/m"'  
  // ClassWizard generated virtual function overrides G?*)0`~W  
  //{{AFX_VIRTUAL(CCaptureDlg) OF-$*  
 public: 0F/o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >We4F2?  
 protected: D5^wT>3>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _e:c 22T'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gAD,  
  //}}AFX_VIRTUAL &]tZ6  
  // Implementation 0w)Gb}o$  
 protected: ' >4 H#tu  
  HICON m_hIcon; WS6'R    
  // Generated message map functions V^apDV\AV  
  //{{AFX_MSG(CCaptureDlg) /6QwV->  
  virtual BOOL OnInitDialog(); E+)3n[G  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n 'gU  
  afx_msg void OnPaint(); ir !/{IQx  
  afx_msg HCURSOR OnQueryDragIcon(); p?PK8GL  
  virtual void OnCancel(); vnc- W3N  
  afx_msg void OnAbout(); b1\.hi  
  afx_msg void OnBrowse(); F!ZE4S_  
  afx_msg void OnChange(); ^ZuwUuuf  
 //}}AFX_MSG ebfT%_N  
 DECLARE_MESSAGE_MAP() 05hjC  
}; LD/NMb  
#endif lub_2Cb|j  
Q #IlUo  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x4v@o?zW  
#include "stdafx.h" 4j_\_:$w<  
#include "Capture.h" %\$~B?At  
#include "CaptureDlg.h" n` M!K:Pq  
#include <windowsx.h> UB^OMB-W.m  
#pragma comment(lib,"hook.lib") K,j'!VQA4g  
#ifdef _DEBUG eCFMWFhC  
#define new DEBUG_NEW ma TQ 0GX  
#undef THIS_FILE >\[/e{Q"  
static char THIS_FILE[] = __FILE__; ;S0Kf{DN2  
#endif JCFiKt9n  
#define IDM_SHELL WM_USER+1 Dk%+|c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }l"pxp1K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bY&!d.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8n??/VDRl  
class CAboutDlg : public CDialog X)Zc*9XA  
{ |r['"6  
 public: XCvL`  
  CAboutDlg(); Cg_9V4h.C  
  // Dialog Data u'`eCrKT*  
  //{{AFX_DATA(CAboutDlg) ;|U !\Xp  
  enum { IDD = IDD_ABOUTBOX }; !:baG]Y  
  //}}AFX_DATA *{DpNV8"  
  // ClassWizard generated virtual function overrides duQ ,6  
  //{{AFX_VIRTUAL(CAboutDlg) TAB'oLNp  
 protected: 1 K(0tG:5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0#Ae<  
  //}}AFX_VIRTUAL QlE]OAdB42  
  // Implementation WIKSz {"=/  
 protected: L _D#  
  //{{AFX_MSG(CAboutDlg) z=/&tRe W  
  //}}AFX_MSG YC[c QX  
  DECLARE_MESSAGE_MAP() fb+_]{7g  
}; Ua%;hI)j$  
-kzp >=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) }i._&x`):  
{ _$+BYK@  
 //{{AFX_DATA_INIT(CAboutDlg)  gx9=L&=d  
 //}}AFX_DATA_INIT g286 P_a`*  
} `:.a5  
t#d{hEr  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;"B@QPX  
{ []:&WA 9N  
 CDialog::DoDataExchange(pDX); (h"-#q8$  
 //{{AFX_DATA_MAP(CAboutDlg) PCx:  
 //}}AFX_DATA_MAP HjCe/J ;  
} eHb@qKnf  
twMDEw#VL  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u+ b `aB  
 //{{AFX_MSG_MAP(CAboutDlg) Z\r?>2  
 // No message handlers vN&(__3((  
 //}}AFX_MSG_MAP ;oCSKY4  
END_MESSAGE_MAP() |_njN  
S ^]mF>xX8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1 HY K& ',  
: CDialog(CCaptureDlg::IDD, pParent) 9+#BU$*v  
{ :Z%-&) F  
 //{{AFX_DATA_INIT(CCaptureDlg) xL [3R   
  m_bControl = FALSE; mor[AJ  
  m_bAlt = FALSE; p(>D5uN_}5  
  m_bShift = FALSE; s}qtM.^W  
  m_Path = _T("c:\\"); TXT!Ae  
  m_Number = _T("0 picture captured."); dWTc3@xd  
  nCount=0; xc}kDpF=g  
  bRegistered=FALSE; f|6 Y  
  bTray=FALSE; `*WzHDv5p  
 //}}AFX_DATA_INIT IY hwFw 5O  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hx!:F"#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);  oP~%7Jt  
} /Z~5bb(  
6<fcG  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \1sWmN6  
{ n"w>Y)C(X)  
 CDialog::DoDataExchange(pDX); '""s%C+  
 //{{AFX_DATA_MAP(CCaptureDlg) .B?fG)'WsF  
  DDX_Control(pDX, IDC_KEY, m_Key); cHC1l  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); GXi)3I%  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _MW W  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7jw5'`;)"  
  DDX_Text(pDX, IDC_PATH, m_Path); !i_~<6Wa7  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  {b|V;/  
 //}}AFX_DATA_MAP Q[c:A@oW  
} .Zc:$"gDu  
D@%!|:  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5(t hDZ!  
//{{AFX_MSG_MAP(CCaptureDlg) QtA@p  
 ON_WM_SYSCOMMAND() MxOIe|=&  
 ON_WM_PAINT() &z05h<]  
 ON_WM_QUERYDRAGICON() N :OLN[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  Q!5W x  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) uuQsK. S  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _ h/:r1  
//}}AFX_MSG_MAP xb2j |KY7  
END_MESSAGE_MAP() *B)10R  
NIAji3  
BOOL CCaptureDlg::OnInitDialog() G\R6=K:f7  
{ v}\Fbe  
 CDialog::OnInitDialog(); d ATAH}r&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [HhaBy9  
 ASSERT(IDM_ABOUTBOX < 0xF000); u"MfxW`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #y'p4Xf  
 if (pSysMenu != NULL) 7^;-[? l  
 { $9h^tP'CV  
  CString strAboutMenu; Pv|sPIIB7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ymn@1BA8J  
  if (!strAboutMenu.IsEmpty()) Yfx?3  
  { &14xYpD<  
   pSysMenu->AppendMenu(MF_SEPARATOR); )-m/(-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,#bT  
  } O>>/2V9  
 } !D!"ftOm  
 SetIcon(m_hIcon, TRUE); // Set big icon mA#;6?6  
 SetIcon(m_hIcon, FALSE); // Set small icon MP_/eC ;  
 m_Key.SetCurSel(0); XZ2 ji_D  
 RegisterHotkey(); w\M"9T  
 CMenu* pMenu=GetSystemMenu(FALSE); fZ(k"*\MZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); K#Xl)h}y7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O;$}j:;KF  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p0D@O_ :5  
 return TRUE; // return TRUE unless you set the focus to a control 8@ S@^C*F  
} ,Iru_=Wk~  
~Rx`:kQ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^A=2#j~H\  
{ '!`| H 3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) - _~\d+>w  
 {  /i   
  CAboutDlg dlgAbout; OKAmw >{  
  dlgAbout.DoModal(); 21my9Ui]  
 } wb%4f6i  
 else *uSlp_;kB  
 { ZENblh8fs  
  CDialog::OnSysCommand(nID, lParam); OnyAM{$g  
 } T+PERz(  
} ~>Y^?l  
Q3'P<"u  
void CCaptureDlg::OnPaint() q;#bFPh  
{ 8K@e8p( y  
 if (IsIconic()) Md0`/F:+2  
 { 3[@:I^q  
  CPaintDC dc(this); // device context for painting 2Sk hBb=d  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |"[;0)dw^  
  // Center icon in client rectangle #=72 /[  
  int cxIcon = GetSystemMetrics(SM_CXICON); cYvt!M\ed  
  int cyIcon = GetSystemMetrics(SM_CYICON); r?|(t?  
  CRect rect; g-H,*^g+  
  GetClientRect(&rect); W)^%/lAh  
  int x = (rect.Width() - cxIcon + 1) / 2; ^)o]hE|  
  int y = (rect.Height() - cyIcon + 1) / 2; {{)pb>E  
  // Draw the icon [+ : zlA  
  dc.DrawIcon(x, y, m_hIcon); t. HwX9  
 } HdyE`FY\  
 else  C~^T=IP  
 { 2Ima15^+F  
  CDialog::OnPaint(); nGsFt.  
 } JE#H&]  
} ^F- 2tc  
'@zMZc!  
HCURSOR CCaptureDlg::OnQueryDragIcon() <tm=  
{ >;#rK@*&  
 return (HCURSOR) m_hIcon; Y5P9z{X=  
} ERIF#EY  
Js.G hTs  
void CCaptureDlg::OnCancel() +HjSU2  
{ Zad>i w}  
 if(bTray) S_^;#=_c  
  DeleteIcon(); =iB$4d2  
  CDialog::OnCancel(); ;Zc0imYL  
} qxcTY|&  
N8,g~?r^  
void CCaptureDlg::OnAbout() "Z~@"JLb%  
{ t3*.Bm:^  
 CAboutDlg dlg; wa!z:}]  
 dlg.DoModal(); m|;gl|dTB  
} `=Rxnl,<U  
=`2jnvx  
void CCaptureDlg::OnBrowse() A'"J'q*t  
{ ~Q]/=HK  
 CString str; mE'HRv  
 BROWSEINFO bi; H_ NoW  
 char name[MAX_PATH]; D( y c  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #TV #*  
 bi.hwndOwner=GetSafeHwnd(); o=PW)37>  
 bi.pszDisplayName=name; AG#Mj(az!  
 bi.lpszTitle="Select folder"; 7UqDPEXU]`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4QYStDFe  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vbtjPse  
 if(idl==NULL) eT?vZH[N  
  return; sQ&<cBs2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C0khG9,BL  
 str.ReleaseBuffer(); 7W+{U0 2O  
 m_Path=str; '}OAl  
 if(str.GetAt(str.GetLength()-1)!='\\') e&K7n@  
  m_Path+="\\"; r1z+yx  
 UpdateData(FALSE); m:k;?p:x  
} *g9VI;X  
p9!jM\(  
void CCaptureDlg::SaveBmp() ')iyD5/4  
{ `=kiqF2P}  
 CDC dc; I]cZcx,<q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2Ky|+s[`[  
 CBitmap bm; {bC(>k|CQ  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5A%Uv*  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]vw%J ^7:a  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (Zej\lEN  
 CDC tdc; -zZb]8\E  
 tdc.CreateCompatibleDC(&dc); 5 o[E8c 8  
 CBitmap*pOld=tdc.SelectObject(&bm); Zeq^dV5y77  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \Hq=_}]F  
 tdc.SelectObject(pOld); ^* CKx  
 BITMAP btm; p  S|  
 bm.GetBitmap(&btm); Xi~I<&  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; w}M)]kY  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k9&W0$I#  
 BITMAPINFOHEADER bih; Gs4t6+Al  
 bih.biBitCount=btm.bmBitsPixel; i&<@}:,  
 bih.biClrImportant=0; ] pv!Ll  
 bih.biClrUsed=0; Q91mCP~$  
 bih.biCompression=0; IU"n`HS  
 bih.biHeight=btm.bmHeight; f1B t6|W%  
 bih.biPlanes=1; dIA1\;@  
 bih.biSize=sizeof(BITMAPINFOHEADER); o*[[nK*fL  
 bih.biSizeImage=size; NFG~PZ`6R  
 bih.biWidth=btm.bmWidth; YpG6p0 nd  
 bih.biXPelsPerMeter=0; q9\(<<f|  
 bih.biYPelsPerMeter=0; :3b\pEO9\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]w]:9w  
 static int filecount=0; YllW2g:  
 CString name; !G<gp4Js+N  
 name.Format("pict%04d.bmp",filecount++); H1 i+j;RN  
 name=m_Path+name; 6I|9@~!y[  
 BITMAPFILEHEADER bfh; f %P#.  
 bfh.bfReserved1=bfh.bfReserved2=0; w;kiH+&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >#`{(^  
 bfh.bfSize=54+size; z)R\WFBW  
 bfh.bfOffBits=54; RF~c/en  
 CFile bf; #8%~u+"N  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 82 1 6_Qm  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); P` Gb }]rW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0OnqKgf  
  bf.WriteHuge(lpData,size); }_Y\6fcd  
  bf.Close(); ' R= OeH  
  nCount++; M{=p0?X  
 } &$h#9  
 GlobalFreePtr(lpData); dd@ D s  
 if(nCount==1) vtzbF1?O  
  m_Number.Format("%d picture captured.",nCount); 3=0b  
 else UY)Iu|~0b  
  m_Number.Format("%d pictures captured.",nCount); :Z6l)R+V  
  UpdateData(FALSE); }!WuJz"  
} (%fSJCBl[P  
Re1}aLd  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5X9*K  
{ ?9~|K/`l  
 if(pMsg -> message == WM_KEYDOWN) #qEUGD`  
 { S@ItgG?X  
  if(pMsg -> wParam == VK_ESCAPE) TUQe.oAi  
   return TRUE; jz I,B  
  if(pMsg -> wParam == VK_RETURN) 1NAtg*`  
   return TRUE; `R-VJR 2"  
 } c =Zurqj  
 return CDialog::PreTranslateMessage(pMsg); m'2EiYX$}\  
} )-i(%;,*e  
FX~pjM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R?:(~ X\  
{ 99[v/L>F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ jtwe9  
  SaveBmp(); =[)2DJC  
  return FALSE; <}%gZ:Z6g  
} vfh\X1Ui}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ '=UsN_@  
 CMenu pop; n,p \~Tu,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); U.ew6`'Te  
 CMenu*pMenu=pop.GetSubMenu(0); C-(O*hK  
 pMenu->SetDefaultItem(ID_EXITICON); xz}=C:s  
 CPoint pt; kP&Ekjt@  
 GetCursorPos(&pt); Ft@ZK!'@  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); yq`  ,)  
 if(id==ID_EXITICON) * [b~2  
  DeleteIcon(); \obM}caT  
 else if(id==ID_EXIT) 4@@gC&:Y  
  OnCancel(); zH *7!)8  
 return FALSE; *{=q:E$  
} Emv9l~mIu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]/Cu,mX  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2'?C  
 AddIcon(); `yM9XjEl>  
 return res; TEbE-h0)]  
} hNF,sA  
sv#/78~|  
void CCaptureDlg::AddIcon() v2 >Dn=V  
{ gv,%5r0YOw  
 NOTIFYICONDATA data; 2K2*UC`f  
 data.cbSize=sizeof(NOTIFYICONDATA); s~I#K[[5  
 CString tip; VWMr\]g  
 tip.LoadString(IDS_ICONTIP); VS+5{w:t  
 data.hIcon=GetIcon(0); *C(q{|f  
 data.hWnd=GetSafeHwnd(); N&W7g#F  
 strcpy(data.szTip,tip); "I3&a1*  
 data.uCallbackMessage=IDM_SHELL; _D1)_?`a@-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; oXGP6#  
 data.uID=98; oN(F$Nvk  
 Shell_NotifyIcon(NIM_ADD,&data); / KKA/  
 ShowWindow(SW_HIDE); A$]#f  
 bTray=TRUE; ^>h2.A J  
} 21~~=+)X  
.1[pO_  
void CCaptureDlg::DeleteIcon() I! ~3xZ  
{ QaAMiCZFR  
 NOTIFYICONDATA data; ^K!R4Y4t  
 data.cbSize=sizeof(NOTIFYICONDATA); ;Y$d !an0  
 data.hWnd=GetSafeHwnd(); )GJlQ1x  
 data.uID=98; z_:r&UP`"  
 Shell_NotifyIcon(NIM_DELETE,&data); s1zkkLw`*  
 ShowWindow(SW_SHOW); :LD+B1$y  
 SetForegroundWindow(); ^bXCYkx  
 ShowWindow(SW_SHOWNORMAL); R-\"^BV#Z  
 bTray=FALSE; SXmh@a"*\  
} K(}<L-cv  
_;k))K^  
void CCaptureDlg::OnChange() iBqIV  
{ / gE9 W  
 RegisterHotkey();  w1t0X{  
} !)uXCg9U  
D o!]t7Y$  
BOOL CCaptureDlg::RegisterHotkey() Q8bn|#`  
{ 6hqqZ  
 UpdateData(); T!Uf PfEI  
 UCHAR mask=0; jHc/ EZB  
 UCHAR key=0; oX[I4i%G  
 if(m_bControl) (9!kKMQW'  
  mask|=4; :$oiP  
 if(m_bAlt) s *<T5Z  
  mask|=2; O9)k)A]`O  
 if(m_bShift) * 9}~?#b  
  mask|=1; Ky'\t7p u  
  key=Key_Table[m_Key.GetCurSel()]; 1)!]zV  
 if(bRegistered){ GoG_4:^#h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $I90KQB\_  
  bRegistered=FALSE; A|P `\_  
 } f2{qj5 K  
 cMask=mask; #pX+~ {  
 cKey=key; 'Ie!%k^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); - o sxKT:  
 return bRegistered; .t{?doOT  
} .n)0@X!  
8?k.4{?  
  四、小结 B4;P)\ 2  
5>M@ F0  
  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