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
  • 5193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: H0s,tTK8  
  C``%<)WC  
  一、实现方法 W&6P%0G/  
2Fce| Tn  
  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: uM0 z%z5b  
*IGgbg[0  
#pragma data_seg("shareddata") R/iw#.Yy  
HHOOK hHook =NULL; //钩子句柄 #uT-_L}s w  
UINT nHookCount =0; //挂接的程序数目 Ajhrsa\~a  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 R)#D{/#FW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 %u43Pj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 59p'Ega.  
static int KeyCount =0; 2ZB'WzH.X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 56AaviEC  
#pragma data_seg() V2'(}k  
2HMlh.R(C  
  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。 rBkf@  
lyx p:  
  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: V D.p"F(]  
8sg8gBt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR gNzQ"W=  
cKey,UCHAR cMask) :*6tbUp  
{ cu|#AW  
 BOOL bAdded=FALSE; >NW /0'/  
 for(int index=0;index<MAX_KEY;index++){ W9Bl'e  
  if(hCallWnd[index]==0){ >&aFSL,f  
   hCallWnd[index]=hWnd; -";'l @D=  
   HotKey[index]=cKey; ~c :e0}  
   HotKeyMask[index]=cMask; 6U7z8NV&[  
   bAdded=TRUE; MlsF?"H p  
   KeyCount++; =M 7FD  
   break; l@<^V N@  
  } W UdKj  
 } yK0Q,   
 return bAdded; Lz=nJn  
} }vxb, [#  
//删除热键 lyIstfRh15  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -^$CGRE6A  
{ McxJ C<  
 BOOL bRemoved=FALSE; @"kA&=0;|J  
 for(int index=0;index<MAX_KEY;index++){ ay'= M`uO_  
  if(hCallWnd[index]==hWnd){ & .+[~2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X!CLOHVA a  
    hCallWnd[index]=NULL; [t<^WmgtxL  
    HotKey[index]=0; "(/|[7D)  
    HotKeyMask[index]=0; R?>a UFM  
    bRemoved=TRUE; 8b(UqyV  
    KeyCount--; bI@+Or  
    break; -d %bc?  
   } 5cxA,T  
  } v.cB3/$ z  
 } I\Y/*u  
 return bRemoved; A T+|}B!  
} A,lcR:@w  
rd0BvQ9TK  
^P:9iu)+]~  
  DLL中的钩子函数如下: 5D-xm$8C  
{;Mcor3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E7^tU416  
{ qp  
 BOOL bProcessed=FALSE; 27t:-O  
 if(HC_ACTION==nCode) >efYpd#^  
 { z mrk`o~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X  LA  
   switch(wParam) e@Z(z^V  
   {  > g8;x#  
    case VK_MENU: 2y ~]Uo  
     MaskBits&=~ALTBIT; #R305  
     break; )f(#Fn  
    case VK_CONTROL: Qgo0uu M  
     MaskBits&=~CTRLBIT; wRnt$ 1  
     break; 8Th|'  
    case VK_SHIFT: H`),PY2  
     MaskBits&=~SHIFTBIT; @5acTY Q  
     break; #2_phm'  
    default: //judge the key and send message f*1.Vg0`-  
     break; a`q">T%q  
   } %OfaBv&  
   for(int index=0;index<MAX_KEY;index++){ [% |i  
    if(hCallWnd[index]==NULL) Rc0OEs%7P  
     continue; `Kpn@Xg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i)+@'!6  
    { Ct|iZLh`j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ysGK5kFz  
     bProcessed=TRUE; 8!b#ez   
    } mAk)9`f/  
   } HS="t3  
  } 5mnIQ~psR  
  else if((lParam&0xc000ffff)==1){ //有键按下 $MfHA~^  
   switch(wParam) \uQ(-ji  
   { %^2LTK(P  
    case VK_MENU: *S:^3{.m=  
     MaskBits|=ALTBIT; _j}|R(s*+V  
     break; vtCt6M  
    case VK_CONTROL: vbmi_[,U  
     MaskBits|=CTRLBIT; <^ @1wg  
     break; la</IpC  
    case VK_SHIFT: ,wlF n  
     MaskBits|=SHIFTBIT; XcR2]\  
     break; (O\5gAx  
    default: //judge the key and send message  zy  
     break; $FNj>1  
   } 8}XtVF;  
   for(int index=0;index<MAX_KEY;index++){ g9<*+fV 2$  
    if(hCallWnd[index]==NULL) U $# ?Lw  
     continue; TlQ#0_as[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xb?P'nD  
    { ?`u Y*+u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Eu l,1yR  
     bProcessed=TRUE; (6^v`SZ  
    } Al5E  
   } rs]%`"&=  
  } yS@c2I602  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 q$(aMO&J  
   for(int index=0;index<MAX_KEY;index++){ =n cu# T]  
    if(hCallWnd[index]==NULL) 8l~] }2LAs  
     continue; ltwX-   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) aiF7\^aw$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -ce N}Cb3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 r0+lH:G*q  
   } g`d5OHvO o  
  } ; "ux{ .  
 } =;l .<{<VH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A Ns.`S  
} 4fT,/[k?  
JLT10c3  
  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: =$X5O&E3'  
Z[)t34EY"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $k,Z)2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ckj2$c~  
g1@zk $  
  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: Q]S~H+eRy  
l<ag\ d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2RFYnDN  
{ ylUxK{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Y}&//S A  
 { )M<"YI)g  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 3=RVJb  
  SaveBmp(); Q })x4  
  return FALSE; e=<knKc Q  
 } <4ccTl  
 …… //其它处理及默认处理 FIL?nkYEO  
} oM G8?p  
'Ybd'|t{}  
?3D|{  
  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。 ;PCnEs  
V7U&8UPb  
  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。 k |k  
A'vQtlvKA  
  二、编程步骤 2&MIt(\-  
5%BexIk  
  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"; sD H^l)4h  
\3JZ =/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HY0q!.qog  
ajC'C!"^Ty  
  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; mFfw*,M  
Ydm 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; ` Fnl<C<  
H=Scrvfx  
  5、 添加代码,编译运行程序。 _1Iy/T@1  
\UA\0p  
三、程序代码 Cuu yG8  
2l]*><q|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL PP)iw@9j  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #hG0{_d7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ R % [ZQ K  
#if _MSC_VER > 1000 eRU0gvgLu"  
#pragma once 2;Vss<hR4A  
#endif // _MSC_VER > 1000 8=QOp[w   
#ifndef __AFXWIN_H__ 'D`O4TsP>  
#error include 'stdafx.h' before including this file for PCH P 4Vi~zMX  
#endif `EKmp|B_p_  
#include "resource.h" // main symbols B7 PkCS&X  
class CHookApp : public CWinApp gZA[Sq  
{ NwAvxN<R(f  
 public: Dl=9<:6FW  
  CHookApp(); W>f q 9  
  // Overrides H#H@AY3Y  
  // ClassWizard generated virtual function overrides ~o{GQ>  
  //{{AFX_VIRTUAL(CHookApp) paKur%2u  
 public: kw)( "SQ  
  virtual BOOL InitInstance();  N>ncv  
  virtual int ExitInstance(); mj{B_3b5  
  //}}AFX_VIRTUAL `HVS}}{a  
  //{{AFX_MSG(CHookApp) w O H{L  
  // NOTE - the ClassWizard will add and remove member functions here. -R %T Dx  
  // DO NOT EDIT what you see in these blocks of generated code ! d}D%%noIu  
  //}}AFX_MSG o\/&05rp]  
  DECLARE_MESSAGE_MAP() .8o?`  
}; l5h+:^#M5c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Fl0(n #L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rA+UftC:p6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vn&{yCm3  
BOOL InitHotkey(); cp1-eR_&  
BOOL UnInit(); /80H.|8O  
#endif ]MD,{T9l\>  
zM+4<k_dH]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. LZ#=Ks  
#include "stdafx.h" 1O#]qZS}]  
#include "hook.h" 7gWT[  
#include <windowsx.h> j1zrjhXI  
#ifdef _DEBUG jY;T:C-T  
#define new DEBUG_NEW Wd`*<+t]  
#undef THIS_FILE cNbH:r"Ay  
static char THIS_FILE[] = __FILE__; oW}nr<G{<  
#endif } 6 ,m2u  
#define MAX_KEY 100 n[S-bzU^t  
#define CTRLBIT 0x04 \;XDPC j  
#define ALTBIT 0x02 VSx9aVPkC  
#define SHIFTBIT 0x01 5!QT }Um  
#pragma data_seg("shareddata") fe!eZiE  
HHOOK hHook =NULL; '/OcJVSR  
UINT nHookCount =0; @h&:xA56  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey rn$G.SMgz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Cn"_x  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y^!>'cdV  
static int KeyCount =0; YD3jP}Ym  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift yj$$k~@  
#pragma data_seg() "Jahc.I  
HINSTANCE hins; 2LfiaHO  
void VerifyWindow(); z`"*60b  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) oACbZ#/@n  
//{{AFX_MSG_MAP(CHookApp) 6|mHu2qXm  
// NOTE - the ClassWizard will add and remove mapping macros here. sL Kk1A  
// DO NOT EDIT what you see in these blocks of generated code! ,`Keqfx  
//}}AFX_MSG_MAP e{EC# %x_  
END_MESSAGE_MAP() kzE<Y  
V` T l$EF  
CHookApp::CHookApp() LC1WVK/  
{ ]OSq}ul  
 // TODO: add construction code here, >jU25"XI[  
 // Place all significant initialization in InitInstance 0g 2?  
} Iuyq!R4:7  
ZUyS+60  
CHookApp theApp; m?< ^b_a}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~8 B]  
{ vjL +fH<0:  
 BOOL bProcessed=FALSE; !>:SPt l  
 if(HC_ACTION==nCode) _<E.?K$gbU  
 { T_)g/,5>  
  if((lParam&0xc0000000)==0xc0000000){// Key up /Nc)bF%gX  
   switch(wParam) h;+{0a  
   { iQJa6QF&:  
    case VK_MENU: #a`D6;  
     MaskBits&=~ALTBIT; M7[GwA[Z +  
     break; (*M*muk  
    case VK_CONTROL: .5"s[(S  
     MaskBits&=~CTRLBIT; .FN;3HU  
     break; &SG5 f[  
    case VK_SHIFT: >'lvZt  
     MaskBits&=~SHIFTBIT; xfF;u9$;  
     break; tj? %{L  
    default: //judge the key and send message r|63T%q!  
     break; "ejsz&n  
   } )3 I~6ar  
   for(int index=0;index<MAX_KEY;index++){ O#<F"e;$  
    if(hCallWnd[index]==NULL) A`--*$8\  
     continue; +CVB[r#hu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M }! qH.W  
    { n^q%_60H   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qyBC1an5,  
     bProcessed=TRUE; 'fs tfk  
    } PNz]L  
   }  >akC  
  } ur:8`+" (  
  else if((lParam&0xc000ffff)==1){ //Key down ?f$U8A4lp  
   switch(wParam) -Qn l)JB  
   { 4VHWoN"U  
    case VK_MENU: VFrp7;z43  
     MaskBits|=ALTBIT; v8YF+N  
     break; }4g$ aTc  
    case VK_CONTROL: k|czQ"vaI  
     MaskBits|=CTRLBIT; zcC:b4  
     break;  Y(  
    case VK_SHIFT: =P9Tc"2PN  
     MaskBits|=SHIFTBIT; zs(P2$  
     break; e-Oz`qW~  
    default: //judge the key and send message xHCdtloi?I  
     break; K'}I?H~P_  
   } !4a#);`G  
   for(int index=0;index<MAX_KEY;index++) S"VO@)d  
   { G|*&owJ  
    if(hCallWnd[index]==NULL) TI}a$I*  
     continue; dVPY07P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K.=5p/^a  
    { =van<l4b#n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); (q0vql  
     bProcessed=TRUE; \11+~  
    } f|=u{6  
   } QE8 `nMf  
  } m2H?VY .^K  
  if(!bProcessed){ aNn4j_V(  
   for(int index=0;index<MAX_KEY;index++){ 2FW"uYA;6  
    if(hCallWnd[index]==NULL) d-C%R9  
     continue; _s+G02/q1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :L{*B$c  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g${JdxR:  
   } ]bAVOKm-  
  } r7sA;Y\  
 } .hM t:BMf*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); t 9t '9  
} ?(U a+*b  
q'/o=De  
BOOL InitHotkey() |g >Q3E  
{ fJP *RVz  
 if(hHook!=NULL){ +0 }_X  
  nHookCount++; C(9"59>{]y  
  return TRUE; W mbIz[un  
 } '=O1n H<  
 else 8{]nS8i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @ze2'56F}  
  if(hHook!=NULL) Q lA?dXQ  
   nHookCount++; QFnpp\K  
  return (hHook!=NULL); +*w}H 0Z  
} &]Uo>Gb3!q  
BOOL UnInit() MD*dq  
{ m?; ?I]`  
 if(nHookCount>1){ sYo&@~T  
  nHookCount--; 7AS_Aw1L  
  return TRUE; 1hlU 6 =Y  
 } MRw4?HqB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?:M4GY" gV  
 if(unhooked==TRUE){ [KFCc_:  
  nHookCount=0; q2r$j\L%  
  hHook=NULL; o ^ \+Ua  
 } .P`QCH;Ih  
 return unhooked; $}r.fji,c  
} jV9oTH-  
qp)Wt6 k?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BVj(Q}f8  
{ liG|#ny{  
 BOOL bAdded=FALSE;  sa&`CEa  
 for(int index=0;index<MAX_KEY;index++){ O_ZYm{T[7  
  if(hCallWnd[index]==0){ p!8phS#iP  
   hCallWnd[index]=hWnd; K,JK9)T  
   HotKey[index]=cKey; ZjMnGRP  
   HotKeyMask[index]=cMask; u#rbc"  
   bAdded=TRUE; a|= ^   
   KeyCount++; vG.KSA  
   break;  BdiV  
  } _yUYEq<`  
 } S6_:\Q  
 return bAdded; a$h^<D ^  
} <YtjE!2  
F~qZIggD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ll-QhcC$  
{ y3o3G  
 BOOL bRemoved=FALSE; }#u #m.  
 for(int index=0;index<MAX_KEY;index++){ rjiHP;-t1  
  if(hCallWnd[index]==hWnd){ jDqG9]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8!cHRtqK  
    hCallWnd[index]=NULL; W;cY g.W2  
    HotKey[index]=0; tk*-Cx?_  
    HotKeyMask[index]=0; +t%2V?  
    bRemoved=TRUE; ."=p\:^j*  
    KeyCount--; },#7  
    break; JB].ht  
   } @{q<"hT  
  } !zx8I7e4  
 } *!JB^5(H  
 return bRemoved; L@/IyQ[H1  
} {:("oK6w  
QRK\74'uY  
void VerifyWindow() oQ,<Yx%E3  
{ v*qbzW`  
 for(int i=0;i<MAX_KEY;i++){ -aVC`  
  if(hCallWnd!=NULL){ ZZZ9C#hK^9  
   if(!IsWindow(hCallWnd)){ b=xn(HE8|  
    hCallWnd=NULL; $ ,]U~7S  
    HotKey=0; ~Gz9pBv1  
    HotKeyMask=0; e3W~6P  
    KeyCount--; ZAU#^bEQB  
   } KK3iui  
  } GF8wKx#J  
 } Uavl%Q  
} PU,$YPrZ  
'sH_^{V2  
BOOL CHookApp::InitInstance() S4 Uu/EX6S  
{ Dol{y=(3e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); DBB&6~;?  
 hins=AfxGetInstanceHandle(); !OY}`a(z  
 InitHotkey(); LtX53c  
 return CWinApp::InitInstance(); R'zi#FeP  
} .?Y"o3  
<=&$+3r  
int CHookApp::ExitInstance() bKGX> %-  
{ !rr,(!Ip?O  
 VerifyWindow(); hL6;n*S=  
 UnInit(); ~gff{Nzk  
 return CWinApp::ExitInstance(); ;h+~xxu=X  
} [RN]?,  
=t)qy5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file eh<mJL%T  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :&TM0O  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ YfB)TK\W9/  
#if _MSC_VER > 1000 85H \v_[  
#pragma once 9QLG:(~;  
#endif // _MSC_VER > 1000 d[p2? ]  
W"_<SYVJ  
class CCaptureDlg : public CDialog [bP^RY:  
{ eBnx$  
 // Construction tx>7?e8E  
 public: .4[3r[  
  BOOL bTray; T\bP8D  
  BOOL bRegistered; ]q{_i   
  BOOL RegisterHotkey(); uf#h~;B  
  UCHAR cKey; t~j 6wsx;  
  UCHAR cMask; A2:}bb~H  
  void DeleteIcon(); r>peKo[X(  
  void AddIcon();  jK]1X8  
  UINT nCount; S\N1qux{  
  void SaveBmp(); X1`3KqK<9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +71<B>L   
  // Dialog Data yiC7)=  
  //{{AFX_DATA(CCaptureDlg) q0VAkVHw4  
  enum { IDD = IDD_CAPTURE_DIALOG }; >x;\H(g  
  CComboBox m_Key; 4BCe;Q^6  
  BOOL m_bControl; Oa~ThbX7  
  BOOL m_bAlt; 7GsKD=bl]  
  BOOL m_bShift; .waw=C  
  CString m_Path; Vn sV&cx  
  CString m_Number; \Dq'~ d  
  //}}AFX_DATA !9_(y~g{N  
  // ClassWizard generated virtual function overrides s{'Sl{-Eu  
  //{{AFX_VIRTUAL(CCaptureDlg) 8.B'O>\T  
 public: F6[F~^9D  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +:;ddV  
 protected: #Z2 'Y[@.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H)D|lt5xy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -9t"$)&  
  //}}AFX_VIRTUAL %}9tU>?F#  
  // Implementation R#4l"  
 protected: OA3J(4!"W  
  HICON m_hIcon; ]E<Z5G1HD  
  // Generated message map functions W34xrm  
  //{{AFX_MSG(CCaptureDlg) 49QsT5b)  
  virtual BOOL OnInitDialog(); 1 6zxPSTr}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -|m3=#  
  afx_msg void OnPaint(); !\7`I}:  
  afx_msg HCURSOR OnQueryDragIcon(); B~Kx Up  
  virtual void OnCancel(); W`G bo uxd  
  afx_msg void OnAbout(); XY'8oU`]{  
  afx_msg void OnBrowse(); FFcCoPX_  
  afx_msg void OnChange(); xOe1v9<  
 //}}AFX_MSG "i;.>  
 DECLARE_MESSAGE_MAP() /@ @F nQ++  
}; |})s0TU  
#endif nd8<*ru$  
N^rpPq  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kzRvLs4xM  
#include "stdafx.h" 4@-tT;$  
#include "Capture.h" rc8HZ  
#include "CaptureDlg.h" ZxnPSA@%  
#include <windowsx.h> 'lZlfS:Z8  
#pragma comment(lib,"hook.lib") ES+ CAwqf  
#ifdef _DEBUG pKc!sd C  
#define new DEBUG_NEW  _'!?fA  
#undef THIS_FILE kuH%aM<R  
static char THIS_FILE[] = __FILE__; ML12&E>  
#endif |KYl'"5\  
#define IDM_SHELL WM_USER+1 %[p*6&V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `}),wBq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zVS{X=u  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g9pKoi|\E  
class CAboutDlg : public CDialog <\^o  
{ =Q_1Mr4O  
 public: CqnHh@]nu  
  CAboutDlg(); {zcG%b WJ  
  // Dialog Data Ep;uz5 ^8  
  //{{AFX_DATA(CAboutDlg) l[T-Ak  
  enum { IDD = IDD_ABOUTBOX }; )4ek!G]Rb  
  //}}AFX_DATA J -z.  
  // ClassWizard generated virtual function overrides d%P2V>P  
  //{{AFX_VIRTUAL(CAboutDlg) C|&tdh :g  
 protected: qB$-H' j:;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'r!!W0-K  
  //}}AFX_VIRTUAL W/2y; @  
  // Implementation ]vQa~}  
 protected: _R\FB|_  
  //{{AFX_MSG(CAboutDlg) ?C2(q6X+s  
  //}}AFX_MSG ,"`20.Lv  
  DECLARE_MESSAGE_MAP() ED>7  
}; 5<(* +mP`  
`Vw G]2 I  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :g|.x  
{ F-3=eKZ  
 //{{AFX_DATA_INIT(CAboutDlg) *1dZs~_  
 //}}AFX_DATA_INIT W8g13oAu"  
} }'P|A  
uBww  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4~Cf_`X}]  
{ Jq` Dvz  
 CDialog::DoDataExchange(pDX); Gky*EY  
 //{{AFX_DATA_MAP(CAboutDlg) { }/  
 //}}AFX_DATA_MAP #-B<u-  
} %6cr4}Zm}  
`C>h]H(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) pqO3(2F9  
 //{{AFX_MSG_MAP(CAboutDlg) bDvGFSAH  
 // No message handlers j>JBZ#g  
 //}}AFX_MSG_MAP d8: $ll  
END_MESSAGE_MAP() AJ/Hw>>$?m  
4xW~@m eNB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2`]c&k;]  
: CDialog(CCaptureDlg::IDD, pParent) 3J"`mQ  
{ uN<=v&]q  
 //{{AFX_DATA_INIT(CCaptureDlg) [s^p P2  
  m_bControl = FALSE; /1LN\Eu  
  m_bAlt = FALSE; ]  & ]G  
  m_bShift = FALSE; l5w^rj  
  m_Path = _T("c:\\"); tQzbYzGb7  
  m_Number = _T("0 picture captured."); @M\JzV4 A[  
  nCount=0; C,W@C  
  bRegistered=FALSE; J0IKI,X.  
  bTray=FALSE; _W(xO |,M  
 //}}AFX_DATA_INIT 1^$hbRq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )2).kL>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <o()14  
} X{#^O/  
q,fp DNo  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _(f@b1O~  
{ PNAvT$0LaZ  
 CDialog::DoDataExchange(pDX); rmw}Ui"  
 //{{AFX_DATA_MAP(CCaptureDlg) -J63'bb7oi  
  DDX_Control(pDX, IDC_KEY, m_Key); xCL)<8[R,}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); b$H bo;_   
  DDX_Check(pDX, IDC_ALT, m_bAlt); i%133in  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ? /!Fv/  
  DDX_Text(pDX, IDC_PATH, m_Path); |h $Gs2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *=@8t^fa86  
 //}}AFX_DATA_MAP l atm_\  
}  $Z &6  
%t_'rv  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G:b6Wf  
//{{AFX_MSG_MAP(CCaptureDlg) x%X3FbF]  
 ON_WM_SYSCOMMAND() &H# l*  
 ON_WM_PAINT() ~W>{Dd(J_  
 ON_WM_QUERYDRAGICON() ~*EipxhstJ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a)2l9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %rs2{Q2k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) uvl91~&G  
//}}AFX_MSG_MAP fAStM:  
END_MESSAGE_MAP() S3x^#83  
_~Od G  
BOOL CCaptureDlg::OnInitDialog() aEdMZ+P.  
{ MkVv5C  
 CDialog::OnInitDialog(); ^'Lp<YJs6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6 p;Pf9 f  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;0_T\{H"nR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fQ~~%#z1  
 if (pSysMenu != NULL) 5%(  
 { fX9b1x  
  CString strAboutMenu; ("A45\5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {!( htg;  
  if (!strAboutMenu.IsEmpty()) w:B&8I(n}w  
  { dh]Hf,OLF  
   pSysMenu->AppendMenu(MF_SEPARATOR); <8%+-[(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vH6(p(l  
  } >7a ENKOg:  
 } fPN/Mxu  
 SetIcon(m_hIcon, TRUE); // Set big icon 5Zc  
 SetIcon(m_hIcon, FALSE); // Set small icon 8Ie0L3d-  
 m_Key.SetCurSel(0); |qpm  
 RegisterHotkey(); @I Y<i5(  
 CMenu* pMenu=GetSystemMenu(FALSE); Flpl,|n a  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ST#)Fl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,^4"e (  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b?=r%D->w  
 return TRUE; // return TRUE unless you set the focus to a control xz@*V>QT  
} ly!3~W  
*W2] Kxx*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Pi[]k]XA\  
{ q:vN3#=^qf  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) D3 +|Os)  
 { e+Mm!\ ;`  
  CAboutDlg dlgAbout; SN[yC  
  dlgAbout.DoModal(); $hJ 4=F  
 } .nr%c*JUp  
 else g0~m[[  
 { ([JFX@  
  CDialog::OnSysCommand(nID, lParam); 3mE8tTA$R  
 } s!09cS  
} ,EH-Sf2Cb  
Mf"(P.GIS  
void CCaptureDlg::OnPaint() =S^vIo)  
{ kdA]gpdw  
 if (IsIconic()) Z^F>sUMR  
 { x6T$HN/2  
  CPaintDC dc(this); // device context for painting Y edF%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); LfnQcI$kO  
  // Center icon in client rectangle /;TD n>lq  
  int cxIcon = GetSystemMetrics(SM_CXICON); T}p|_)&y  
  int cyIcon = GetSystemMetrics(SM_CYICON); Rp zuSh  
  CRect rect; 6EWCJ%_  
  GetClientRect(&rect); "}uu-5]3  
  int x = (rect.Width() - cxIcon + 1) / 2; T?n[1%K  
  int y = (rect.Height() - cyIcon + 1) / 2; P'5Lu  
  // Draw the icon C>l (4*S  
  dc.DrawIcon(x, y, m_hIcon); ]w)uo4<^J  
 } M(^IRI-  
 else qsN}KgTjg  
 { $43CNnf3N  
  CDialog::OnPaint(); >&Ye(3w&  
 } |%Y=]@f  
} ('_S1?y  
^s8JW"H  
HCURSOR CCaptureDlg::OnQueryDragIcon() Hb!A\;>  
{ Q Na*Y@i  
 return (HCURSOR) m_hIcon; }sZy|dd  
} bnp:J|(ld  
C`oB [  
void CCaptureDlg::OnCancel() }D~m%%,  
{ &@&^k$du8q  
 if(bTray) ='/#G0W  
  DeleteIcon(); } F*=+n  
  CDialog::OnCancel(); IxlPpS9Wx  
} huin?,eGz  
p{V(! v|  
void CCaptureDlg::OnAbout() sYTToanA$?  
{ 78mJ3/?rC  
 CAboutDlg dlg; 0"@p|nAa  
 dlg.DoModal(); >vfLlYx  
} )/v`k>E  
,l)AYu!q4F  
void CCaptureDlg::OnBrowse() k"`^vV[{F  
{ (yeN> x}_  
 CString str; { 6*UtG  
 BROWSEINFO bi; n*=Tm KQ  
 char name[MAX_PATH]; RCGpZyl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); j]9,yi  
 bi.hwndOwner=GetSafeHwnd(); Bm^8"SSN  
 bi.pszDisplayName=name; Gm\jboef]  
 bi.lpszTitle="Select folder"; /P{'nI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0pe*DbYP5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zy9W{{:P(1  
 if(idl==NULL) GsWf$/iC:  
  return; BI6`@}%7>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); na/,1iI<  
 str.ReleaseBuffer(); 'Ya-;5Y]  
 m_Path=str; KU0;}GSNX}  
 if(str.GetAt(str.GetLength()-1)!='\\') PurY_  
  m_Path+="\\"; cmLI!"RLe  
 UpdateData(FALSE); 28,HZaXhc  
} 5sMyH[5zY  
u7u1lx>S  
void CCaptureDlg::SaveBmp() L: _pJP  
{ H,1I z@W1  
 CDC dc; #fe zUU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); u z>V  
 CBitmap bm; 1w?DSHe  
 int Width=GetSystemMetrics(SM_CXSCREEN); i ;YRE&X  
 int Height=GetSystemMetrics(SM_CYSCREEN); Fc"+L+h@W  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  O6!:Qd  
 CDC tdc; EO.}{1m=hx  
 tdc.CreateCompatibleDC(&dc); x8h=3e$  
 CBitmap*pOld=tdc.SelectObject(&bm); FiNB$A  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cy_zEJjbD  
 tdc.SelectObject(pOld); ^t)alNGos  
 BITMAP btm; O$& 4{h`  
 bm.GetBitmap(&btm); Il s^t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _k5-Wd5Ypw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }D#[yE,=\  
 BITMAPINFOHEADER bih; q}7(w$&  
 bih.biBitCount=btm.bmBitsPixel; ML_[Z_Q<z  
 bih.biClrImportant=0; Bdf]?s[]  
 bih.biClrUsed=0; o,y {fv:ki  
 bih.biCompression=0; /\uW[mt  
 bih.biHeight=btm.bmHeight; >:U{o!N`#_  
 bih.biPlanes=1; Nxt z1  
 bih.biSize=sizeof(BITMAPINFOHEADER); WG*S:_?  
 bih.biSizeImage=size; Q92hI"  
 bih.biWidth=btm.bmWidth; NIOWjhi[Jn  
 bih.biXPelsPerMeter=0; 4}=Z+tDu>  
 bih.biYPelsPerMeter=0; Q\v^3u2;m`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e/u (Re  
 static int filecount=0; N%+C5e<  
 CString name; [kg*BaG:  
 name.Format("pict%04d.bmp",filecount++); [ U?a %$G>  
 name=m_Path+name; 0Z~G:$O/i  
 BITMAPFILEHEADER bfh; y <21~g=  
 bfh.bfReserved1=bfh.bfReserved2=0; EY 9N{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,1-#Z"~c  
 bfh.bfSize=54+size; SSI('6Z/  
 bfh.bfOffBits=54; #kDJ>r |&-  
 CFile bf; |zSoA=7?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <DM:YWNa  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i/WiSwh:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8Ow0A  
  bf.WriteHuge(lpData,size); XB-l[4?  
  bf.Close(); _:,U$W  
  nCount++; H;eOrX {GT  
 } VYN1^Tp  
 GlobalFreePtr(lpData); e$@azi1  
 if(nCount==1) t12 xPtN1  
  m_Number.Format("%d picture captured.",nCount); o.H(&ex|  
 else oT27BK26?h  
  m_Number.Format("%d pictures captured.",nCount); p=U5qM.O  
  UpdateData(FALSE); :Qra9; Y  
} `]:&h'  
vErlh:~e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |#!P!p}  
{ ? v2JuhRe  
 if(pMsg -> message == WM_KEYDOWN) T8rf+B/.L  
 { g{06d~Y  
  if(pMsg -> wParam == VK_ESCAPE) cH%#qE3  
   return TRUE; b:}+l;e5 2  
  if(pMsg -> wParam == VK_RETURN) \a\ApD  
   return TRUE; q+-Bl  
 } Syj7K*,%bZ  
 return CDialog::PreTranslateMessage(pMsg); O(QJiS  
} ^iq$zHbc0u  
+'!vm6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V|8`]QW@  
{ {$mj9?n=v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i.`RQZ$,/  
  SaveBmp(); SLG3u;Ab  
  return FALSE; F[S Ys/M  
} HJu;4O($  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wm r8[n&c  
 CMenu pop; oUwu:&<Orm  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0Bpix|mq  
 CMenu*pMenu=pop.GetSubMenu(0); 6+[7UH~pm^  
 pMenu->SetDefaultItem(ID_EXITICON); f}>S"fFI  
 CPoint pt; kdry a  
 GetCursorPos(&pt); M%8:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h0fbc;l  
 if(id==ID_EXITICON) e:  
  DeleteIcon(); 4^O'K;$leD  
 else if(id==ID_EXIT) Mz sDDP+h  
  OnCancel(); hVcV_  
 return FALSE; u*$ 1e  
} C}{$'#DV2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :2fz4n0{/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) M(2c{TT  
 AddIcon(); }Myi0I<  
 return res; fXHN m$"n  
} A[6$'IJ  
3%W R  
void CCaptureDlg::AddIcon() L>mv\D;o.  
{ pPdOw K#  
 NOTIFYICONDATA data; V0h  
 data.cbSize=sizeof(NOTIFYICONDATA); w<]Wg^dyQ  
 CString tip; 8HyK;+ZkVd  
 tip.LoadString(IDS_ICONTIP); ei8OLcw:x  
 data.hIcon=GetIcon(0); 85fBKpEe  
 data.hWnd=GetSafeHwnd(); z;_d?S <*m  
 strcpy(data.szTip,tip); 0#mu[O  
 data.uCallbackMessage=IDM_SHELL; &\0`\#R  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u&>o1!c*P  
 data.uID=98; 2Xm\;7  
 Shell_NotifyIcon(NIM_ADD,&data); 3'WS6B+  
 ShowWindow(SW_HIDE); e_BOzN~c  
 bTray=TRUE; >#RXYDd  
} [yF4_UoF  
e ga< {t  
void CCaptureDlg::DeleteIcon() :hp=>^$Y  
{ /L1qdkG  
 NOTIFYICONDATA data; .hCOi<wB  
 data.cbSize=sizeof(NOTIFYICONDATA); :B<lDcFKJ  
 data.hWnd=GetSafeHwnd(); 5"[Qs|VjA6  
 data.uID=98; &zF1&J58z  
 Shell_NotifyIcon(NIM_DELETE,&data); 46dh@&U  
 ShowWindow(SW_SHOW); av1*i3  
 SetForegroundWindow(); @,-xaZ[  
 ShowWindow(SW_SHOWNORMAL); TY,w3E_  
 bTray=FALSE; hNV" {V3`{  
} he/UvMu  
PT|W{RlNl  
void CCaptureDlg::OnChange() or u.a   
{ !5}Ibb  
 RegisterHotkey(); I hvL2 zB  
} rBP!RSl1  
Ywf.,V  
BOOL CCaptureDlg::RegisterHotkey() -, ~n|ceI  
{ qPpC)6-Q  
 UpdateData(); 6|05-x|  
 UCHAR mask=0; :Q\b$=,:  
 UCHAR key=0; $+sNjwv^F  
 if(m_bControl) ,2)LH 'Xx  
  mask|=4; d;ElqRC&  
 if(m_bAlt) tWi@_Rlx;  
  mask|=2; 6ZVJ2xs[%  
 if(m_bShift) laqW {sX^5  
  mask|=1; 3_IuK 6K2  
  key=Key_Table[m_Key.GetCurSel()]; D a)[mxJ  
 if(bRegistered){ nVoPTr  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); u|\Lb2Kb:  
  bRegistered=FALSE; {vAq08  
 } #zXkg[J6d  
 cMask=mask; S"w$#"EJA  
 cKey=key; I`2hxLwh+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5>7ECe*  
 return bRegistered; R{3f5**0  
} v\t$. _at  
lC.Yu$O5  
  四、小结 bzmT.!  
q[l},nw  
  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