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
  • 3444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: ,zoHmV1Wd+  
  s1 >8uW  
  一、实现方法 < c^'$  
 ImhkU%  
  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: 7He"IJ  
XS&Pc  
#pragma data_seg("shareddata") mw5>[  
HHOOK hHook =NULL; //钩子句柄 %Y ZC dS  
UINT nHookCount =0; //挂接的程序数目 ,'(|,f42  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 R@3HlGuRKw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 v)du]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u;t<rEC2  
static int KeyCount =0; 0cHcBxdF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ([q>.[WbH]  
#pragma data_seg() bra2xHK@  
<9pI~\@w  
  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。 %6cr4}Zm}  
h~#F2#.  
  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: bW W!,-|R  
j>JBZ#g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B1}i0pV,,  
cKey,UCHAR cMask) 7-B|B{]  
{ I'P|:XKI  
 BOOL bAdded=FALSE; VjWJx^ZL#  
 for(int index=0;index<MAX_KEY;index++){ .vKgiIC:  
  if(hCallWnd[index]==0){ [s^p P2  
   hCallWnd[index]=hWnd; eW8cI)wU  
   HotKey[index]=cKey; B@-\.m  
   HotKeyMask[index]=cMask; zRjbEL  
   bAdded=TRUE; = cxO@Fu  
   KeyCount++; hD5@PeLh  
   break; K;"H$0 !9  
  } R WY>`.su  
 } X]}ai5  
 return bAdded; <o()14  
} 85# 3|5n  
//删除热键 ph6/+[:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =~O3j:<6  
{ &;ddnxFI  
 BOOL bRemoved=FALSE; -btNwE6[.  
 for(int index=0;index<MAX_KEY;index++){ 15{^waR6  
  if(hCallWnd[index]==hWnd){ s&ox%L4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q)aoc.f!v  
    hCallWnd[index]=NULL; L?u {vX  
    HotKey[index]=0; &k)+]r  
    HotKeyMask[index]=0; Ia](CN*;6  
    bRemoved=TRUE; DH\Ox>b=  
    KeyCount--; %t_'rv  
    break; i-0 :Fs  
   } Q% aF~  
  } D?E VzG  
 } EO+Ix7w  
 return bRemoved; FiQ&g*=|  
} %GjG.11V,_  
E*)A!2rlK  
53uptQ{   
  DLL中的钩子函数如下: 9*iVv)jd  
MkVv5C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n2*Ua/J-8  
{ ^e "4@O"  
 BOOL bProcessed=FALSE; jR1^e$  
 if(HC_ACTION==nCode) 0D4 4  
 { wa[J\lW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {C`M<2W]  
   switch(wParam) u@D5SkT  
   {  ~jKIuO/  
    case VK_MENU: j*8Ze!^  
     MaskBits&=~ALTBIT; GAH<  
     break; OtL~NTY  
    case VK_CONTROL: <2j$P Y9  
     MaskBits&=~CTRLBIT; ZD50-w;  
     break; ? }^ y6  
    case VK_SHIFT: >*/ |t L  
     MaskBits&=~SHIFTBIT; xz@*V>QT  
     break; miBCq l@x  
    default: //judge the key and send message ~+ae68{p  
     break; c5f57Z  
   } fc:87ZR{K  
   for(int index=0;index<MAX_KEY;index++){ 6/QWzw.0c  
    if(hCallWnd[index]==NULL) jY9tq[~/  
     continue; i]zh8|">  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^38k xwh  
    { cJT_Qfxx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s!09cS  
     bProcessed=TRUE; 78T;b7!-C  
    } aG"  
   } kdA]gpdw  
  } mMZ=9 ?m  
  else if((lParam&0xc000ffff)==1){ //有键按下 S% ptG$Z  
   switch(wParam) [PrJf"Z "  
   { \8Ewl|"N:u  
    case VK_MENU: 31g1zdT!  
     MaskBits|=ALTBIT; VKXB)-'L  
     break; M9Z9s11{H  
    case VK_CONTROL: ][z!};  
     MaskBits|=CTRLBIT; <6N3()A)%1  
     break; ctb , w  
    case VK_SHIFT: |Qpo[E }a  
     MaskBits|=SHIFTBIT; w0>5#j q#r  
     break; $43CNnf3N  
    default: //judge the key and send message ciH TnC  
     break; K/(Z\lL  
   } MmfshnTN  
   for(int index=0;index<MAX_KEY;index++){ qqYQ/4Ajw  
    if(hCallWnd[index]==NULL) u8~5e  
     continue; Dxr4B<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C`oB [  
    {  Mv%B#J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~8Ef`zL  
     bProcessed=TRUE; g[{rX4~|  
    } F j"]C.6B.  
   } up3m um  
  } sYTToanA$?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]w8h#p  
   for(int index=0;index<MAX_KEY;index++){ Xp|$z~  
    if(hCallWnd[index]==NULL) 7z&^i-l.  
     continue; |Pse=_i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d D^?%,a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H,fVF837  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 uvD*]zX  
   } WdrMp  
  } <dY{@Cgw=  
 } B<!wh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6`'KM/   
} /P{'nI  
i;+<5_   
  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: 4,6?sTuX  
oW/H8q<wY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TsRbIq[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m`3gNox  
x A ZRl  
  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: IC.R4-  
MB5X$5it  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }Tk*?tYt  
{  YP}r15P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |VX0o2  
 { "CT`]:GGK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 i ;YRE&X  
  SaveBmp(); #mv~1tL  
  return FALSE; QtqE&j  
 } nqujT8  
 …… //其它处理及默认处理 t4,(W`  
} ]FO)U  
g>Kh? (  
k{C|{m  
  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。 _k5-Wd5Ypw  
oth=#hfU^  
  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。 oMZ|)(7C  
U[l{cRT   
  二、编程步骤 \E:l E/y  
$QuSmA<4lS  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; :sb+jk  
H Ff9^  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,Z]4`9c  
xXc3#n  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; X=b]Whuv  
K"ytE2:3  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; c:z<8#A}  
V_7QWIdiy>  
  5、 添加代码,编译运行程序。 QW"BGg~6c  
J|I&{  
三、程序代码 k;y5nXIlN  
?t];GNU`l  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c`G~.paY|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) aruT eJF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ oQ8If$a}  
#if _MSC_VER > 1000 i/WiSwh:  
#pragma once erZ%C <  
#endif // _MSC_VER > 1000 ~ f>km|Q{u  
#ifndef __AFXWIN_H__ H;eOrX {GT  
#error include 'stdafx.h' before including this file for PCH @8 GW?R  
#endif MDKiwT@#  
#include "resource.h" // main symbols 4wQ>HrS)(  
class CHookApp : public CWinApp '@+a]kCMev  
{ 8a4&}^|  
 public: o5eFLJ6  
  CHookApp(); e!~x-P5M`  
  // Overrides (|<.7K N  
  // ClassWizard generated virtual function overrides $3MYr5  
  //{{AFX_VIRTUAL(CHookApp) UKxeN[fv  
 public: VjVL/SO/  
  virtual BOOL InitInstance(); |F#L{=B  
  virtual int ExitInstance(); q+-Bl  
  //}}AFX_VIRTUAL b}#ay2AR  
  //{{AFX_MSG(CHookApp) (t)a u  
  // NOTE - the ClassWizard will add and remove member functions here. +'!vm6  
  // DO NOT EDIT what you see in these blocks of generated code ! R+O[,UM^I~  
  //}}AFX_MSG BWN[>H %S  
  DECLARE_MESSAGE_MAP() #<|q4a{8  
}; ()v{HB i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5 5T c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p94 w0_m@|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w oSI 2i  
BOOL InitHotkey();  $VCWc#  
BOOL UnInit(); x GHS  
#endif f#9\&-h e0  
#I.Wmfz  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 0vRug|}k#%  
#include "stdafx.h" #E( n  
#include "hook.h" M _z-~G  
#include <windowsx.h> +wwK#ocw  
#ifdef _DEBUG 7BhRt8FSD+  
#define new DEBUG_NEW }TCOm_Y/qL  
#undef THIS_FILE A[6$'IJ  
static char THIS_FILE[] = __FILE__; CdRgI^5  
#endif }~RH!Q1  
#define MAX_KEY 100 ~\z\f} w  
#define CTRLBIT 0x04 w<]Wg^dyQ  
#define ALTBIT 0x02 GUyc1{6  
#define SHIFTBIT 0x01 /# M|V6n  
#pragma data_seg("shareddata") z;_d?S <*m  
HHOOK hHook =NULL; *?`:=  
UINT nHookCount =0; >aZ$x/U+Iw  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey huau(s0um  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT f}'E|:Z 7k  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey q)uq?sZe  
static int KeyCount =0; =kspHP<k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift uz1t uX_  
#pragma data_seg() &r;4$7  
HINSTANCE hins; WlnI`!)d  
void VerifyWindow(); V}>0r+NL<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  R9->.eE  
//{{AFX_MSG_MAP(CHookApp) gn? ~y`  
// NOTE - the ClassWizard will add and remove mapping macros here. Q b5AQf30  
// DO NOT EDIT what you see in these blocks of generated code! *}\!&Zk"  
//}}AFX_MSG_MAP @,-xaZ[  
END_MESSAGE_MAP() Cp_YIcnEJ  
(,E.1j]ji  
CHookApp::CHookApp() GJA3  
{ ^zv28Wq>  
 // TODO: add construction code here, (l.`g@(L  
 // Place all significant initialization in InitInstance or u.a   
} m#'2 3  
> @ulvHL  
CHookApp theApp; 'W~O ?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xcz1(R  
{ *fq=["O  
 BOOL bProcessed=FALSE; 1(Kd/%]{  
 if(HC_ACTION==nCode) -, ~n|ceI  
 { DiAPs_@  
  if((lParam&0xc0000000)==0xc0000000){// Key up 6M"]p  
   switch(wParam) {O6f1LuH  
   { :Q\b$=,:  
    case VK_MENU: &Q^M[X  
     MaskBits&=~ALTBIT; N"b>]Ab] ;  
     break; bgd1j,PWbW  
    case VK_CONTROL: 67Ai.3dR  
     MaskBits&=~CTRLBIT; V&DS+'P  
     break; }0T1* .Cz  
    case VK_SHIFT: v.+-)RLQg  
     MaskBits&=~SHIFTBIT; f;6a4<bz  
     break; A8OV3h6]  
    default: //judge the key and send message S5'BXE,  
     break; }`yIO"{8n  
   } 2Ni$ (`"  
   for(int index=0;index<MAX_KEY;index++){ Z-b^{uP  
    if(hCallWnd[index]==NULL) +"a . ,-f!  
     continue; +GWeu0b(~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @7%nMTZ@&v  
    { ocy fU=}X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kzGD *  
     bProcessed=TRUE; VuFH >8n  
    } i7}) VDsZ  
   } (?&X<=|"  
  } v\t$. _at  
  else if((lParam&0xc000ffff)==1){ //Key down Tc@r#!.m  
   switch(wParam) @Q3aJ98)2  
   { X#(?V[F]  
    case VK_MENU: k oC2bX  
     MaskBits|=ALTBIT; KLs%{'[7:  
     break; {y'c*NS  
    case VK_CONTROL: cp2e,%o  
     MaskBits|=CTRLBIT; u|=_!$8  
     break; Q5iuK#/  
    case VK_SHIFT: rU5gQq;  
     MaskBits|=SHIFTBIT; B[Uvj~g  
     break; F`U%xn,  
    default: //judge the key and send message ^l ~i>:V  
     break; R1X9  
   } f>5{SoM  
   for(int index=0;index<MAX_KEY;index++) w:& m_z#M  
   { +is;$ 1rq  
    if(hCallWnd[index]==NULL) U=p,drF,A  
     continue; ./)A6O*#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6.2_UN^<  
    { ld4QhZia  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gec<5Ewg  
     bProcessed=TRUE; 8MM#q+8  
    } A--Hg-N|  
   } Dq Kk9s;6_  
  }  s6 w</  
  if(!bProcessed){ $TL~SVHj;{  
   for(int index=0;index<MAX_KEY;index++){ "Sc_E}q |e  
    if(hCallWnd[index]==NULL) *\I?gDON  
     continue; !SD?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Tl%#N"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ZyT9y  
   } Io{)@H"f  
  } 3.?PdK&C  
 } ^:\|6`{n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KDuM;  
} "Nn/vid;  
D(s[=$zua  
BOOL InitHotkey() [(5;jUmF@  
{ 'd^U!l  
 if(hHook!=NULL){ 6?Rm>+2>v  
  nHookCount++; (+38z)f  
  return TRUE; y1(smZU  
 } Xp{+){Iu  
 else b"t!nfgo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j{IAZs#@>  
  if(hHook!=NULL) hJ>{`Tw  
   nHookCount++; ngcXS2S_  
  return (hHook!=NULL); _LFZ0  
} /fWVgyW> 6  
BOOL UnInit() =E8lpN'  
{ c</d1xT  
 if(nHookCount>1){ pV(b>O  
  nHookCount--; ]YQlCx`  
  return TRUE; (01M0b#  
 } [P]zdw w#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +iir]"8  
 if(unhooked==TRUE){ `B"=\0  
  nHookCount=0; zJOjc/\  
  hHook=NULL; >o>r@;  
 } '%yWz)P  
 return unhooked; }>=k!l{  
} YW}q@AY7  
0R >M_|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3aQWzEnh  
{ -]~&Pi|  
 BOOL bAdded=FALSE; 29 L~SMf  
 for(int index=0;index<MAX_KEY;index++){ j#"?Oe{_1  
  if(hCallWnd[index]==0){ t;T MD\BU  
   hCallWnd[index]=hWnd; B t-o:)pa  
   HotKey[index]=cKey; RRqHo~*0  
   HotKeyMask[index]=cMask; n|Iy  
   bAdded=TRUE; DmM<Kkg.J  
   KeyCount++; DKAqQ?fS  
   break; v9( ->X'  
  } 'xm_oGWE  
 } #Sr_PEo _  
 return bAdded; z/)HJo2#  
} "GEJ9_a[  
U,yU-8z/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3XYCtp8  
{  `@b+'L  
 BOOL bRemoved=FALSE; bX:Y5o49  
 for(int index=0;index<MAX_KEY;index++){ +N: K V}K  
  if(hCallWnd[index]==hWnd){ yjaX\Wb[z[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !s06uh  
    hCallWnd[index]=NULL; tI|?k(D  
    HotKey[index]=0; &*B=5W;6^u  
    HotKeyMask[index]=0; hn#i,XnY  
    bRemoved=TRUE; dkt'~  
    KeyCount--; )Ge.1B$8h  
    break; $-[V)]h  
   } 8bLA6qmM\  
  } !Low%rP  
 } (|I:d!>:U  
 return bRemoved; \/g.`Pe  
} , \ |S BS  
<UOx>=h  
void VerifyWindow() U8KB @E  
{ NK2Kw{c"iI  
 for(int i=0;i<MAX_KEY;i++){ M>VT$!Lx  
  if(hCallWnd!=NULL){ ,4zwd@&O  
   if(!IsWindow(hCallWnd)){ tT'*Uu5  
    hCallWnd=NULL; U:ggZ`.  
    HotKey=0; 2F[smUL  
    HotKeyMask=0; uo;aC$US  
    KeyCount--; zV_U/]y  
   } T&c0j(  
  } {L5!_] 6  
 } D::$YR ~R  
} _fx0-S*$  
\Y&*sfQ  
BOOL CHookApp::InitInstance() u[q1]]   
{ ;UTT>j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1OJD!juL$  
 hins=AfxGetInstanceHandle(); ||a 5)D  
 InitHotkey(); :Fz;nG-G  
 return CWinApp::InitInstance(); v!n\A}^:  
} y|f`sBMM  
7pMQ1- (  
int CHookApp::ExitInstance() w DswK "T  
{ eL3HX _2(  
 VerifyWindow(); S*-n%D0q5  
 UnInit(); -Zx hh  
 return CWinApp::ExitInstance(); /` 891( f,  
} <`,pyvR Kv  
DFKFsu8s  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Dnn$-W|NC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9v>BP`Mg  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fmyyQ|]O"  
#if _MSC_VER > 1000 {j i;~9'Q  
#pragma once ~CiVLS H=  
#endif // _MSC_VER > 1000 D%GB2-j R  
qI;"yG-x-  
class CCaptureDlg : public CDialog 7hwl[knyB  
{ 7OY<*ny  
 // Construction ^HYmi\`  
 public: Tap=K|b ]  
  BOOL bTray; 5[l9`Cn&A  
  BOOL bRegistered; /+2;".  
  BOOL RegisterHotkey(); sf )ojq6s  
  UCHAR cKey; 7 zo)t1H1  
  UCHAR cMask; dzJ\+ @4  
  void DeleteIcon(); y3l3XLI*b  
  void AddIcon(); 9s\(yC8h  
  UINT nCount; 1-[~}  
  void SaveBmp(); ?&$??r^i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H%N !;Jz=  
  // Dialog Data L".Qf|b*  
  //{{AFX_DATA(CCaptureDlg) i(R&Q;{E^  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9l) .L L  
  CComboBox m_Key; *#+e_)d  
  BOOL m_bControl; (qd$wv^ h  
  BOOL m_bAlt; .2?tx OKh  
  BOOL m_bShift; BzBij^h  
  CString m_Path; #U45H.Rz  
  CString m_Number; Q- ( [3%  
  //}}AFX_DATA *V+6409m  
  // ClassWizard generated virtual function overrides HDqPqrWm  
  //{{AFX_VIRTUAL(CCaptureDlg) Q79& Q04XN  
 public: #?%akQ+w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U:6 J~  
 protected: RDU,yTHq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _~!*|<A_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6&/H XqP  
  //}}AFX_VIRTUAL BDoL)}bRE  
  // Implementation Z#7T!/28  
 protected: &atT7m  
  HICON m_hIcon; =f'MiU!p6  
  // Generated message map functions <hlH@[7!  
  //{{AFX_MSG(CCaptureDlg) iC-WQkQY  
  virtual BOOL OnInitDialog(); $nN`K*%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }p-<+sFo  
  afx_msg void OnPaint(); |jB]5ciT  
  afx_msg HCURSOR OnQueryDragIcon(); 0CXh|AU  
  virtual void OnCancel(); VB6EM|bphl  
  afx_msg void OnAbout(); VsS. \1  
  afx_msg void OnBrowse(); 9>~UqP9  
  afx_msg void OnChange(); g7*cwu  
 //}}AFX_MSG v_Om3i9$E  
 DECLARE_MESSAGE_MAP() >C""T`5]  
}; TAz #e  
#endif i8R.Wl$l  
x`N _tWZ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =hE5 ?}EP+  
#include "stdafx.h" _r!''@B  
#include "Capture.h" zrfE'C8O  
#include "CaptureDlg.h" WK7=z3mu  
#include <windowsx.h> WBTdQG Q6  
#pragma comment(lib,"hook.lib") 4^H(p  
#ifdef _DEBUG @91Q=S  
#define new DEBUG_NEW GCx1lm  
#undef THIS_FILE ;{b 1'  
static char THIS_FILE[] = __FILE__; m~s.al(G91  
#endif {XYv &K  
#define IDM_SHELL WM_USER+1 LF+#PnK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bkg/A;H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a<+Qw'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _%WJ7~>  
class CAboutDlg : public CDialog I}oxwc  
{ @}@`lv65}  
 public: #"|Y"#@k  
  CAboutDlg(); gE8=#%1<  
  // Dialog Data >o{(f  
  //{{AFX_DATA(CAboutDlg) 12)~PIaF  
  enum { IDD = IDD_ABOUTBOX }; ,ry2J,IT7  
  //}}AFX_DATA =IBdnEz:M  
  // ClassWizard generated virtual function overrides ?_9cFo59:  
  //{{AFX_VIRTUAL(CAboutDlg) }N; c  
 protected: r1:S8RT;H5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G hH0-g{-  
  //}}AFX_VIRTUAL `o(PcX3/}  
  // Implementation \ B 0xL,o<  
 protected: ,sPsL9]$  
  //{{AFX_MSG(CAboutDlg) i|u3Qt5  
  //}}AFX_MSG (bH*i\W  
  DECLARE_MESSAGE_MAP() k1y&' 3%  
}; [.tqgU  
Zcd!y9]#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hNXP-s  
{ GCul6,w  
 //{{AFX_DATA_INIT(CAboutDlg) T 1m097  
 //}}AFX_DATA_INIT eN]0]9JO  
} $x;wnXXXM  
_$/(l4\T[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yI\  
{ k^I4z^O=-;  
 CDialog::DoDataExchange(pDX); xy`aR< L  
 //{{AFX_DATA_MAP(CAboutDlg) (1\!6  
 //}}AFX_DATA_MAP cw#p!mOi~  
} Mj5=t:MI  
-)@DH;[tb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) w#_xV =  
 //{{AFX_MSG_MAP(CAboutDlg) Gad! }dz  
 // No message handlers ?b, eZ+t  
 //}}AFX_MSG_MAP :pQZ)bF  
END_MESSAGE_MAP() Uxx=$&#  
K' N`rx.7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Nb\4Mv`  
: CDialog(CCaptureDlg::IDD, pParent) Q%~b(4E^7P  
{ 0}$",M!p  
 //{{AFX_DATA_INIT(CCaptureDlg) /Kb7#uq  
  m_bControl = FALSE; 04NI.Jv  
  m_bAlt = FALSE; sAS\-c'6  
  m_bShift = FALSE; s5FyP "V  
  m_Path = _T("c:\\"); 4VLrl8$K  
  m_Number = _T("0 picture captured."); R^P~iAO  
  nCount=0; <jU[&~p  
  bRegistered=FALSE; m *8[I  
  bTray=FALSE; ,eD@)K_:  
 //}}AFX_DATA_INIT 7~TE=t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q(gu ";&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); f5zxy!dhKS  
} LKY4rY!|@d  
q{Hk27kt  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -fVeE<[  
{ ?,NZ /n  
 CDialog::DoDataExchange(pDX); C/%umazP9  
 //{{AFX_DATA_MAP(CCaptureDlg) 6 grJoim|  
  DDX_Control(pDX, IDC_KEY, m_Key); A:[La#h|p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a_'W1ek-@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "v4;m\g&:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ON _uu]=  
  DDX_Text(pDX, IDC_PATH, m_Path); yyxGVfr  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1eI >Yy>}  
 //}}AFX_DATA_MAP ^Qz8`1`;Z  
} @5Q}o3.zA-  
VcIsAK".4[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `ysPEwA|  
//{{AFX_MSG_MAP(CCaptureDlg) K97lP~Hu  
 ON_WM_SYSCOMMAND() *ghkw9/  
 ON_WM_PAINT() -cNh5~p=  
 ON_WM_QUERYDRAGICON() #wbaRx@rc  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sLzcTGa2:z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wlBdA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2fTkHBhn&  
//}}AFX_MSG_MAP ~ C6< 75  
END_MESSAGE_MAP() wA) NB  
qO[6?q=c:  
BOOL CCaptureDlg::OnInitDialog() dz &| 3o  
{ yAR''>  
 CDialog::OnInitDialog(); U*, 8 ,C  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); cH'*J/  
 ASSERT(IDM_ABOUTBOX < 0xF000); :h0as!2@dp  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  IPa08/  
 if (pSysMenu != NULL) enlk)_btp  
 { V=k!&xN~  
  CString strAboutMenu; $4'I 3{$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z,}1K!  
  if (!strAboutMenu.IsEmpty()) DSYtj} >  
  { (qlI QC  
   pSysMenu->AppendMenu(MF_SEPARATOR); e{U`^ao`F8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *RUB`tEL  
  } z|F>+6l"Y7  
 } b* qkox;j  
 SetIcon(m_hIcon, TRUE); // Set big icon )-|A|1Uo  
 SetIcon(m_hIcon, FALSE); // Set small icon Fp+^`;j  
 m_Key.SetCurSel(0); v<_}Br2I[  
 RegisterHotkey(); UP 1Y3  
 CMenu* pMenu=GetSystemMenu(FALSE); &D[dDUdHs  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a+szA};  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yEtI5Qk  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?cCh?> h  
 return TRUE; // return TRUE unless you set the focus to a control ,W5pe#n  
} t*zve,?}  
gWqmK/.U.0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jpZX5_o  
{ aoz+g,1 //  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) HnUM:-6  
 { kf_s.Dedw  
  CAboutDlg dlgAbout; \% !]qv  
  dlgAbout.DoModal(); f'TjR#w  
 } kI]i,v#F  
 else 0aSN 8  
 { f'\I52;FB  
  CDialog::OnSysCommand(nID, lParam); }fZT$'*;  
 } h eZJ(mR  
} oiJa1X  
5|NM]8^^0[  
void CCaptureDlg::OnPaint() 6#7f^uIK  
{ $%`OJf*k  
 if (IsIconic()) Dd<gYPC  
 { <tuh%k  
  CPaintDC dc(this); // device context for painting pnca+d  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); IpGq_TU  
  // Center icon in client rectangle \r^=W=  
  int cxIcon = GetSystemMetrics(SM_CXICON); - 4'yp  
  int cyIcon = GetSystemMetrics(SM_CYICON); hUSr1jlA  
  CRect rect; #p&iH9c_  
  GetClientRect(&rect); %bZ3^ ub}t  
  int x = (rect.Width() - cxIcon + 1) / 2; l6Ze6X I  
  int y = (rect.Height() - cyIcon + 1) / 2; })T}e7>T  
  // Draw the icon ($7>\"+Tl  
  dc.DrawIcon(x, y, m_hIcon); )M#~/~^f+  
 } aWm0*W"(@  
 else k`Ab*M$@Xs  
 { hZY+dHa]  
  CDialog::OnPaint(); '|':W6m,  
 } Ko\m8\3?fK  
} Ooc,R(  
yC =5/wy`  
HCURSOR CCaptureDlg::OnQueryDragIcon() ScQJsFE6  
{ ]n${j/x  
 return (HCURSOR) m_hIcon; 8*=N\'m],  
} rVzj LkN^  
)_ NQ*m  
void CCaptureDlg::OnCancel() L:%ek3SOz  
{ _jy*`$"q (  
 if(bTray) 3lM mSKN  
  DeleteIcon(); _:+W0YS  
  CDialog::OnCancel(); ^TVica  
} Yt++  ?  
& oZI. Qeo  
void CCaptureDlg::OnAbout() W!4GL>9m}A  
{ +I/7eIG?|  
 CAboutDlg dlg; Y gQ_P4B;  
 dlg.DoModal(); 92]>"  
} bnWIB+%_  
 .r[DqC  
void CCaptureDlg::OnBrowse()  P%xk   
{ }=^YLu=  
 CString str; j1v fp"J1  
 BROWSEINFO bi; [`=|^2n?  
 char name[MAX_PATH]; ORs<<H.d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /_xwHiA  
 bi.hwndOwner=GetSafeHwnd();  &e7yX  
 bi.pszDisplayName=name; r|fJ~0z  
 bi.lpszTitle="Select folder"; pJ6bX4QnDX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1oFU4+{ 4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); QVL92"  
 if(idl==NULL) 1jh^-d5  
  return; nrUrMnlg  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9TO  
 str.ReleaseBuffer(); `dMOBYV  
 m_Path=str; \x(J v Dt  
 if(str.GetAt(str.GetLength()-1)!='\\') 0jrcXN~  
  m_Path+="\\"; ',z'.t  
 UpdateData(FALSE); isj<lnQ  
} .P# c/SQp  
JZD27[b  
void CCaptureDlg::SaveBmp() $T^O38$  
{ %~4R)bsJ'  
 CDC dc; NJz8ANpro$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); uB 6`e!Q  
 CBitmap bm; M86v  
 int Width=GetSystemMetrics(SM_CXSCREEN); ZJP.-`U  
 int Height=GetSystemMetrics(SM_CYSCREEN); GTYGm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); RA+Y./*h  
 CDC tdc; j Z3N+_J1  
 tdc.CreateCompatibleDC(&dc); xRv1zHZ  
 CBitmap*pOld=tdc.SelectObject(&bm); xHJ+!   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k>K23(X  
 tdc.SelectObject(pOld); jXGr{n  
 BITMAP btm; )qn =  
 bm.GetBitmap(&btm); 67}y/C]<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Fng":28o  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I:]s/r7  
 BITMAPINFOHEADER bih; Zr;.`(>  
 bih.biBitCount=btm.bmBitsPixel; }Da8S|)H  
 bih.biClrImportant=0; _&XT =SW}  
 bih.biClrUsed=0; 2OAh7'8<  
 bih.biCompression=0; _:c8YJEG{  
 bih.biHeight=btm.bmHeight; _66zXfM<  
 bih.biPlanes=1; M_T$\z;,  
 bih.biSize=sizeof(BITMAPINFOHEADER); |B)e! #  
 bih.biSizeImage=size; fhLdM  
 bih.biWidth=btm.bmWidth; }f^K}*sK$5  
 bih.biXPelsPerMeter=0; [9z<*@$-  
 bih.biYPelsPerMeter=0; hAfRHd  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S%Pk@n`z]  
 static int filecount=0; |I^\|5  
 CString name; dB<BEe\$g.  
 name.Format("pict%04d.bmp",filecount++); cP$b>3O  
 name=m_Path+name; 6b-d#H/1Y  
 BITMAPFILEHEADER bfh; \&2GLBKpe  
 bfh.bfReserved1=bfh.bfReserved2=0; 5|r3i \  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "o<:[c9/  
 bfh.bfSize=54+size; 3y r{B Xn  
 bfh.bfOffBits=54; L;,Nh  
 CFile bf; V F6OC4 K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &ad9VB7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R@=ve %a-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); qoB   
  bf.WriteHuge(lpData,size); '}P)iS2  
  bf.Close(); 67 7p9{:  
  nCount++; ]o6yU#zn~e  
 } u 6 la  
 GlobalFreePtr(lpData); 5>KAVtYvc  
 if(nCount==1) mrqCW]#u  
  m_Number.Format("%d picture captured.",nCount); 6xk"bIp  
 else miZ{V%  
  m_Number.Format("%d pictures captured.",nCount); -66|Y  
  UpdateData(FALSE); aZ*b"3  
} (66X  
&^ =t%A%#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dvyE._/v  
{ V,|l&-  
 if(pMsg -> message == WM_KEYDOWN) o7/_a/  
 { [ ]3xb`<&  
  if(pMsg -> wParam == VK_ESCAPE) q,aWF5m@  
   return TRUE; Arir=q^2  
  if(pMsg -> wParam == VK_RETURN) qAR~js`5  
   return TRUE; "Z &qOQg%3  
 } x:xKlPGd  
 return CDialog::PreTranslateMessage(pMsg); q{yz]H,  
} kzJNdYtdH  
M`BD]{tN}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0m7J'gm{  
{  t Z\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ BxG0vJN|  
  SaveBmp(); D G7FG--  
  return FALSE; *: e^yi  
} }= s@y"["  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C([;JO 11[  
 CMenu pop; .X_k[l9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3c@Cb`w@  
 CMenu*pMenu=pop.GetSubMenu(0); D*vrQ9&# 8  
 pMenu->SetDefaultItem(ID_EXITICON); {(D$ Xb  
 CPoint pt; Tud[VS?99  
 GetCursorPos(&pt); m`nv4i#o  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )uwpeq$j7l  
 if(id==ID_EXITICON) YOGw Q  
  DeleteIcon(); +wD--24!(  
 else if(id==ID_EXIT) \ts:'  
  OnCancel(); K JPB-  
 return FALSE; d";+8S  
} ghbxRnU}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #OJ^[Zi<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +Y)rv6}m  
 AddIcon(); LNXhzW   
 return res; vB/MnEKR  
} J^n(WnM*F  
[m3G%PO@Da  
void CCaptureDlg::AddIcon() jl3RE|M\<  
{ w^G<]S {l  
 NOTIFYICONDATA data; lsJ'dS  
 data.cbSize=sizeof(NOTIFYICONDATA); 1@CI7j  
 CString tip; !rTh+F*  
 tip.LoadString(IDS_ICONTIP); cQ*:U@  
 data.hIcon=GetIcon(0); L)8;96  
 data.hWnd=GetSafeHwnd(); Wf0ui1@  
 strcpy(data.szTip,tip); o \b8lwA,  
 data.uCallbackMessage=IDM_SHELL; 6dC!&leNi  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^tc@bsUF  
 data.uID=98; OR1XQij  
 Shell_NotifyIcon(NIM_ADD,&data);  PovPO  
 ShowWindow(SW_HIDE); 8* >6+"w  
 bTray=TRUE; ,6i67!lb  
} A-ir   
e3) rF5pp  
void CCaptureDlg::DeleteIcon() r A0[y  
{ 9zi/z_G  
 NOTIFYICONDATA data; r'{pTgm#  
 data.cbSize=sizeof(NOTIFYICONDATA); y'2K7\>E  
 data.hWnd=GetSafeHwnd(); 1swh7  
 data.uID=98; P0' ;65  
 Shell_NotifyIcon(NIM_DELETE,&data); ]~3wq[O  
 ShowWindow(SW_SHOW); 5T8X2fS:  
 SetForegroundWindow(); @_1$ <8  
 ShowWindow(SW_SHOWNORMAL); ;\4}Hcg  
 bTray=FALSE; CM9+h;Zm  
} LeQ2,/7l:  
c)iQ3_&=  
void CCaptureDlg::OnChange() N5%~~JRO  
{ t!D=oBCro  
 RegisterHotkey(); 4?jhZLBU  
} YDs/BF Z  
.Zf#L'Rf  
BOOL CCaptureDlg::RegisterHotkey() *=^_K`y  
{ AGK+~EjL@  
 UpdateData(); wqA5GK>m2  
 UCHAR mask=0; \m5:~,p=  
 UCHAR key=0; aOWbIS[8  
 if(m_bControl) YA{Kgc^  
  mask|=4; jqb,^T|j;m  
 if(m_bAlt) <(3Uu()   
  mask|=2; x9-K}s]%  
 if(m_bShift) U:_T9!fG  
  mask|=1; "9kEqz4a  
  key=Key_Table[m_Key.GetCurSel()]; KGP2,U6  
 if(bRegistered){ Yk?ux Z4)H  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); asPD>jc  
  bRegistered=FALSE; d 'x;]#S  
 } "pMXTRb  
 cMask=mask; 8Q#&=]W$  
 cKey=key; uZ<Bfrc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >tib21*  
 return bRegistered; eA{,=, v)  
} m_\CK5T_  
YJ rK oK}  
  四、小结 <XCH{Te1  
MW'z*r|,  
  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