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
  • 5428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: 1rGi"kdf  
  q :-1ul  
  一、实现方法 ZP;WXB`  
ZDTp/5=?K/  
  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: ]B=2r^fn  
.$N8cYu0  
#pragma data_seg("shareddata") ]5sU =\  
HHOOK hHook =NULL; //钩子句柄 ]o2 Z 14  
UINT nHookCount =0; //挂接的程序数目 W $EAo+V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yR4++yk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _ a -At  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6'6,ySo]  
static int KeyCount =0; t# <(Q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yYn7y1B  
#pragma data_seg() ?i5=sK\  
h[}e5A]}  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 8s)(e9Sr  
t>%+[7?6  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: xay~fD  
Ae|bAyAK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j,CVkA*DY  
cKey,UCHAR cMask) K~Z$NS^W&  
{ ;b;Bl:%?  
 BOOL bAdded=FALSE; Zil<*(kv{  
 for(int index=0;index<MAX_KEY;index++){ vd#BT$d?  
  if(hCallWnd[index]==0){ #Pe|}!)u  
   hCallWnd[index]=hWnd; I.hy"y2&  
   HotKey[index]=cKey; B f"L;L  
   HotKeyMask[index]=cMask; S7f"\[Aw  
   bAdded=TRUE; ve@E.`  
   KeyCount++; Pe)SugCs  
   break; r>Cv@4/j  
  } . E? a  
 } Fd1jElt  
 return bAdded; L]#b =Y  
} 9MUg/  
//删除热键 p n(y4we  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4StoEgFS  
{ ]=?.LMjnH  
 BOOL bRemoved=FALSE; ^Q5advxuq  
 for(int index=0;index<MAX_KEY;index++){ 8 GW0w  
  if(hCallWnd[index]==hWnd){ #55_hY#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hL}AgY@  
    hCallWnd[index]=NULL; NZ:KJ8ea"  
    HotKey[index]=0; iNv"!'|  
    HotKeyMask[index]=0; *TC#|5  
    bRemoved=TRUE; h$$2(!G4  
    KeyCount--; R&FO-{S  
    break; `<IaQY  
   } 5"2pU{xmK  
  } '-M9v3itC  
 } &"mWi-Mpl  
 return bRemoved; ~R  C\  
} )bl^:C  
"eZ~]m}L0  
UB3hC`N\  
  DLL中的钩子函数如下: \CVrLn;}  
c%5Suu( J6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /[,0,B9!3  
{ p%ZAVd*|#V  
 BOOL bProcessed=FALSE; N.dcQQ_iS  
 if(HC_ACTION==nCode) ,FWsgqL{l  
 { !T RU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y[d>7fcf  
   switch(wParam) KkyZd9  
   {  'QQa :3<x  
    case VK_MENU: a|kEza,]  
     MaskBits&=~ALTBIT; uQO\vRh0  
     break; }Wz[ox9b  
    case VK_CONTROL: =H/ 5  
     MaskBits&=~CTRLBIT; Y?xc#'  
     break; UIK4]cYC'  
    case VK_SHIFT: iPdR;O'  
     MaskBits&=~SHIFTBIT; Z:.*fs5  
     break; Bnh*;J0  
    default: //judge the key and send message RKD$'UWX  
     break; mt}3/d  
   } d~z%kl 5:  
   for(int index=0;index<MAX_KEY;index++){ kadw1sYj  
    if(hCallWnd[index]==NULL) %z"n}|%!  
     continue; -I.BQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @H61^K<  
    { \JBPZ~N3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~%QI#s?|  
     bProcessed=TRUE; O[W/=j[  
    } [BuAJ930#5  
   } 5m9;'SF  
  } 3h**y %^  
  else if((lParam&0xc000ffff)==1){ //有键按下 KhZ\q|5  
   switch(wParam) YWhp4`m  
   { 'Oa(]Br[  
    case VK_MENU: UX@8  
     MaskBits|=ALTBIT; xew s~74L  
     break; 67]!xy  
    case VK_CONTROL: *_/n$& I%&  
     MaskBits|=CTRLBIT; x/uC)xm  
     break; O]80";Uv  
    case VK_SHIFT: $aDkZj  
     MaskBits|=SHIFTBIT; y4Lh:;  
     break; 2!? =I'uMA  
    default: //judge the key and send message ]+d> ;$O  
     break; 'pC51}[A{^  
   } C(&3L[  
   for(int index=0;index<MAX_KEY;index++){  wkKSL  
    if(hCallWnd[index]==NULL) 51Q~/  
     continue; vBYk"a6SD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BjV;/<bt  
    { uQiW{Kja2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R/jHH{T3  
     bProcessed=TRUE; pP^5y{  
    } Y3bZ&G)  
   } *&tv(+P  
  } T4h&ly5 f  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 oD=+  
   for(int index=0;index<MAX_KEY;index++){ hFMT@Gy  
    if(hCallWnd[index]==NULL) J Mm'JK?  
     continue; Ah_0o_Di  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C~R,,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cHX~-:KOr  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0`Y"xN`'i  
   } @o>3 Bv.  
  } V?-SvQIk1  
 } cXbQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z9JZV`dNgz  
} _[,7DA.qc  
xP $\ }  
  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: 1ZO/R%[  
RuWu#tk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V-x/lo]Co  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x,UP7=6  
V=)' CCi{  
  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: /A93mY[  
&VTO9d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ue(\-b\)  
{ #Q$+AdY|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) rT';7>{g  
 { {ZKXT8'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c|Fu6LF a  
  SaveBmp(); Le*gdoW.  
  return FALSE; LTcZdQd$  
 } Vr hd\  
 …… //其它处理及默认处理 lS/l iI'Y  
} h I7ur  
?xw0kXK4  
v)<|@TD)  
  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。 tf6 Zz[  
=6gi4!hE  
  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~2M/&rM\  
f7I!o, /  
  二、编程步骤 -;iCe7|Twf  
s=hao4v7z  
  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"; qqSFy>`P  
Aaz2._:/-m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; KN".0WU  
Bb.U4#  
  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; liPaT  
AtNF&=Op  
  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; <ToRPx&E  
;&$f~P Q  
  5、 添加代码,编译运行程序。 3`Gb ;D  
uA~?z :~=  
三、程序代码  =h|xlT  
jbp?6GW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL gm =LM=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) bVOJp% *s  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |f2 bb  
#if _MSC_VER > 1000 LL+PAvMg  
#pragma once UeU`U  
#endif // _MSC_VER > 1000 f47dB_{5f.  
#ifndef __AFXWIN_H__ Ch73=V  
#error include 'stdafx.h' before including this file for PCH g9gi7.'0  
#endif remRm Y?  
#include "resource.h" // main symbols T+41,  
class CHookApp : public CWinApp $Z<x r  
{ Sh\Jm*5  
 public: >J/8lS{#  
  CHookApp(); ]|_+lik#  
  // Overrides 0A')zKik  
  // ClassWizard generated virtual function overrides 7' Gk ip  
  //{{AFX_VIRTUAL(CHookApp) }70A>JBw  
 public: O3tw@ &k  
  virtual BOOL InitInstance(); id [caP=`  
  virtual int ExitInstance(); '3fN2[(  
  //}}AFX_VIRTUAL ~nb1c:F  
  //{{AFX_MSG(CHookApp) ;lf$)3%[  
  // NOTE - the ClassWizard will add and remove member functions here. lPw`KW  
  // DO NOT EDIT what you see in these blocks of generated code ! k(M(]y_  
  //}}AFX_MSG @4=Az1W*  
  DECLARE_MESSAGE_MAP() {!^0j{T  
}; 2b&Fu\2Dmv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); HNd? '  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;e$YM;;d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Yb4%W-5  
BOOL InitHotkey(); vr } -u  
BOOL UnInit(); t"P:}ps{?  
#endif #@J{ )  
$'3'[Nr(;t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. v(p<88.!m  
#include "stdafx.h" A~H@0>1  
#include "hook.h" }!N/?A5  
#include <windowsx.h> C4)m4r%  
#ifdef _DEBUG ;*cCaB0u  
#define new DEBUG_NEW FT\%=>{  
#undef THIS_FILE #]r'?GN  
static char THIS_FILE[] = __FILE__; U\-=|gQ'  
#endif D+y?KihE  
#define MAX_KEY 100 J@+b_e*  
#define CTRLBIT 0x04 +mC?.B2D  
#define ALTBIT 0x02 DA>TT~L  
#define SHIFTBIT 0x01 avW33owb@  
#pragma data_seg("shareddata") CI=M0  
HHOOK hHook =NULL; ^.c<b_(=h  
UINT nHookCount =0; *gOUpbtXa  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey NRazI_Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (Ta(Y=!uq  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Wpc8T="q  
static int KeyCount =0; %:Z_~7ZR  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift yw >Frb5p  
#pragma data_seg() i5SDy(?r  
HINSTANCE hins; _pxurq{  
void VerifyWindow(); l OiZ2_2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r?/!VO-*N  
//{{AFX_MSG_MAP(CHookApp) KBa0  
// NOTE - the ClassWizard will add and remove mapping macros here. d ;i@9+  
// DO NOT EDIT what you see in these blocks of generated code! & l0LW,Bx  
//}}AFX_MSG_MAP $hy0U_}6  
END_MESSAGE_MAP() b8!   
+v< \l=  
CHookApp::CHookApp() Z=oGyA  
{ vbfQy2q  
 // TODO: add construction code here, Z1{>"o:@  
 // Place all significant initialization in InitInstance 5YYBX\MV  
} `%*`rtZ+H.  
a|z@5r%  
CHookApp theApp; 51xf.iB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |)S*RQb\  
{ .R)uk  
 BOOL bProcessed=FALSE; xtut S  
 if(HC_ACTION==nCode) a\}` f=T  
 { *Tr9pq%m  
  if((lParam&0xc0000000)==0xc0000000){// Key up B +MnT{  
   switch(wParam) -_= m j  
   { <u/(7H  
    case VK_MENU: Cv [1HO<  
     MaskBits&=~ALTBIT; nPk&/H%5hn  
     break; +'wO:E1( w  
    case VK_CONTROL: `><E J'h  
     MaskBits&=~CTRLBIT; &0]5zQ  
     break; Kl<NAv%j  
    case VK_SHIFT: )KOIf{  
     MaskBits&=~SHIFTBIT; }i J$&CJ  
     break; LCW}1H:Q  
    default: //judge the key and send message hii#kB2  
     break; ;vy<!@Y;8  
   } J,\e@  
   for(int index=0;index<MAX_KEY;index++){ M0$E_*  
    if(hCallWnd[index]==NULL) je%D&ci$  
     continue; b@O{eQB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H4$f+  
    { NryOdt tI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #Hy\l J  
     bProcessed=TRUE; <h~=d("j  
    } :6]qr86  
   } Hp@Q  
  } u<4bOJn({  
  else if((lParam&0xc000ffff)==1){ //Key down T3I{D@+0  
   switch(wParam) BN~ndWRK  
   { RFX{]bQp9  
    case VK_MENU: Hbn78,~ .  
     MaskBits|=ALTBIT; k5Su&e4]]  
     break; 'V &Tlw|  
    case VK_CONTROL: d{"@<0i?  
     MaskBits|=CTRLBIT; zO@>)@~  
     break; Jt0U`_  
    case VK_SHIFT: ~/XDA:nfL:  
     MaskBits|=SHIFTBIT; XlnSh<e  
     break; ]B$J8.{q0  
    default: //judge the key and send message a ,"   
     break; G#M0 C>n  
   } }F"98s W  
   for(int index=0;index<MAX_KEY;index++) 8H|ac[hXK2  
   { `YqXF=-  
    if(hCallWnd[index]==NULL) `jVRabZ0  
     continue; ( 4# iLs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R:j mn  
    { )sNPWn8<Uy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =3!o _  
     bProcessed=TRUE; p$uPj*  
    } *f_A :`:  
   } 7iyx_gyo  
  } VJ?>o  
  if(!bProcessed){ +bT[lJ2O>G  
   for(int index=0;index<MAX_KEY;index++){ X?XB!D7[  
    if(hCallWnd[index]==NULL) Cc;8+Z=a?G  
     continue; XyiaRW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E^Q J50  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q^?a|l  
   } Qqx!'fft  
  } Cy *.pzCi  
 } [P6m8%Y|s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kdp^{zW}  
} #Ge_3^'  
i,S1|R  
BOOL InitHotkey() xaVn.&Wl  
{ r?!:%L  
 if(hHook!=NULL){ 1z4_QZZ.NG  
  nHookCount++; -y{(h% 6  
  return TRUE; pb)kN%  
 } gS8+S\2  
 else *,IK4F6>:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); - Ry+WS=  
  if(hHook!=NULL) w`=O '0d  
   nHookCount++; r)OiiD"  
  return (hHook!=NULL); -/V(Z+dj  
} E AZX  
BOOL UnInit() e<*qaUI  
{ jU* D  
 if(nHookCount>1){ ?5/7 @V  
  nHookCount--; iJZNSRQJ}r  
  return TRUE; EW1,&H  
 } GdY@$&z{i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Q J-|zS.W  
 if(unhooked==TRUE){ ^9 ]iUx  
  nHookCount=0; U^7bj  
  hHook=NULL; <i]0EE}%  
 } s]|tKQGl,  
 return unhooked; 79D~Mau#  
} t 7o4 aBl"  
1U/RMN3`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )RT?/NW  
{ ([}08OW@  
 BOOL bAdded=FALSE; 9[;da  
 for(int index=0;index<MAX_KEY;index++){ zBu@a:E%H  
  if(hCallWnd[index]==0){ 9t6c*|60#n  
   hCallWnd[index]=hWnd; 9x|`XAB  
   HotKey[index]=cKey; C#^y{q  
   HotKeyMask[index]=cMask; jT}={[9b  
   bAdded=TRUE; MtaGv#mJ  
   KeyCount++; ^m&I^ \  
   break; :8hI3]9  
  } Rb.vyQ  
 } 6>oc,=MV/  
 return bAdded; MIn_?r  
} vSC1n8 /  
\"))P1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ; +(VO  
{ q6w)zTpJGJ  
 BOOL bRemoved=FALSE; ~J&-~<%P}  
 for(int index=0;index<MAX_KEY;index++){ ;{L[1OP%e  
  if(hCallWnd[index]==hWnd){ `:*2TLxIk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4(LLRzzW  
    hCallWnd[index]=NULL; dH PvVe/  
    HotKey[index]=0; nc\`y,>l8  
    HotKeyMask[index]=0; q?dd5JzZy,  
    bRemoved=TRUE; x\(#  
    KeyCount--; p:5NMo  
    break; s1[&WDedM  
   } NjpWK ;L  
  } u[Kz^ga<  
 } vdC0tax  
 return bRemoved; ..X_nF  
} -Dx3*ZhP  
Yj/ o17  
void VerifyWindow() 6]~/`6Dub  
{ \Ta5c31S+  
 for(int i=0;i<MAX_KEY;i++){ PJ0~ymE1~G  
  if(hCallWnd!=NULL){ ]%HxzJ  
   if(!IsWindow(hCallWnd)){ 1n[)({OQ  
    hCallWnd=NULL; 8.n#@%  
    HotKey=0; T3@2e0u )  
    HotKeyMask=0; >Zs!  
    KeyCount--; ;Vs2 e  
   } pu]U_Ll@  
  } t(6]j#5   
 } }DS%?6}Sy  
} GIH{tr1:<  
wT\BA'VQ  
BOOL CHookApp::InitInstance() l<GN<[/.+  
{ nJ]7vj,rB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4 ZnQpKg  
 hins=AfxGetInstanceHandle(); WA~[) S0  
 InitHotkey(); $wp>2  
 return CWinApp::InitInstance(); )9_W"'V  
} xc 1d[dCdp  
_<#92v !F  
int CHookApp::ExitInstance() 3*~`z9-z  
{ SsTBjIX  
 VerifyWindow(); 6qFzo1LO  
 UnInit(); uX3yq<lK"  
 return CWinApp::ExitInstance(); vJ}WNvncVF  
} qnboXGaFu  
4KtD  k  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oI/_WY[t  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) j8p<HE51  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k>mXh{ (  
#if _MSC_VER > 1000 (ct1i>g  
#pragma once os"R'GYmf  
#endif // _MSC_VER > 1000 Qe>_\-f  
Ig}hap]G  
class CCaptureDlg : public CDialog 5=I({=/>  
{ e'A_4;~@s  
 // Construction BInSS*L  
 public: Lv['/!DJ|  
  BOOL bTray; dN3^PK  
  BOOL bRegistered; RU7+$Z0K  
  BOOL RegisterHotkey(); q"<=^vi  
  UCHAR cKey; t3Gy *B  
  UCHAR cMask; Os-Z_zSl6  
  void DeleteIcon(); JX&]>#6|E  
  void AddIcon(); m;l[flQ~  
  UINT nCount; @9| jY1  
  void SaveBmp(); npltsK):  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~*/ >8R(Y  
  // Dialog Data @i!+Z  
  //{{AFX_DATA(CCaptureDlg) <Y7j'n  
  enum { IDD = IDD_CAPTURE_DIALOG }; /~u^@@.  
  CComboBox m_Key; +bLP+]7oZ  
  BOOL m_bControl; =o~+R\1ux+  
  BOOL m_bAlt; yO7y`;Q(sF  
  BOOL m_bShift; DdI%TU K,  
  CString m_Path; W9Azp8)p]  
  CString m_Number; lf>d{zd5  
  //}}AFX_DATA 9e K~g0m  
  // ClassWizard generated virtual function overrides aOGoJCt C  
  //{{AFX_VIRTUAL(CCaptureDlg) p-{ 4 $W  
 public: d9:I.SA)E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dY&v(~&;]  
 protected: #~nXAs]Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y/Y}C.IWp)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \Hrcf+`  
  //}}AFX_VIRTUAL Y GOkqI  
  // Implementation -%MXt  
 protected: S8dfe~|7:  
  HICON m_hIcon; r4/b~n+*  
  // Generated message map functions aC2Vz9e  
  //{{AFX_MSG(CCaptureDlg) 01-rBto$  
  virtual BOOL OnInitDialog(); h<3b+*wYJC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Nm z5:Rq  
  afx_msg void OnPaint(); j% 7Gje[  
  afx_msg HCURSOR OnQueryDragIcon(); lqOpADLS3  
  virtual void OnCancel(); E/oLE^yL  
  afx_msg void OnAbout(); -c?x5/@3  
  afx_msg void OnBrowse(); N.q~\sF^  
  afx_msg void OnChange(); #)7`}7N  
 //}}AFX_MSG =@M9S  
 DECLARE_MESSAGE_MAP() b'+Wf#.]f0  
}; C] mp <  
#endif i=#\`"/  
- @>]iBl  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XLpn3sX$  
#include "stdafx.h" 6AJ`)8HX  
#include "Capture.h" wE.jf.q  
#include "CaptureDlg.h" 1gK^x^l*f  
#include <windowsx.h> 8Pa*d/5Y(  
#pragma comment(lib,"hook.lib") '+/mt_re=  
#ifdef _DEBUG 9ns( F:  
#define new DEBUG_NEW wsB-( 0-  
#undef THIS_FILE {l$)X  
static char THIS_FILE[] = __FILE__; rBmW%Gv  
#endif zqdkt `  
#define IDM_SHELL WM_USER+1 drjNK!XL@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6O{QmB0KK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >oJab R  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c Q-#]  
class CAboutDlg : public CDialog )J@[8 x`  
{ J[?oV;O  
 public: jRC{8^98  
  CAboutDlg(); qpe9?`vVX  
  // Dialog Data oQ]FyV  
  //{{AFX_DATA(CAboutDlg) Ry X11XU  
  enum { IDD = IDD_ABOUTBOX }; q!0HsF  
  //}}AFX_DATA ;hq_}.  
  // ClassWizard generated virtual function overrides ? 3fnt"  
  //{{AFX_VIRTUAL(CAboutDlg) Zj]tiN f\"  
 protected: 2*w`l|Sx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >x6\A7  
  //}}AFX_VIRTUAL t=Rl`1 =(K  
  // Implementation 3Y)z{o>P  
 protected: hk5!$#^  
  //{{AFX_MSG(CAboutDlg) >ph=?M KD  
  //}}AFX_MSG E]~ #EFc  
  DECLARE_MESSAGE_MAP() | ;a$ l(~<  
}; t'$_3ml  
n-M6~   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >qy62:co  
{ `$1A;wg<  
 //{{AFX_DATA_INIT(CAboutDlg) TxQsi"0c  
 //}}AFX_DATA_INIT SHPDbBS  
} d1g7:s9$0  
a] c03$fK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,/p+#|>C=  
{ Ou4hAm91s  
 CDialog::DoDataExchange(pDX); Hfj.8$   
 //{{AFX_DATA_MAP(CAboutDlg) nt>3i! l  
 //}}AFX_DATA_MAP /!Ag/SmS!9  
} P|ibUxSA~,  
J3aom,$o  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Cd^1E]O0{  
 //{{AFX_MSG_MAP(CAboutDlg) !U4YA1>>  
 // No message handlers g/$RuT2U  
 //}}AFX_MSG_MAP G L0P&$h  
END_MESSAGE_MAP() \bF<f02P  
R$u1\r1I  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F7C+uG Ts  
: CDialog(CCaptureDlg::IDD, pParent) 4Hf'/%kW  
{ XLiwE$:t%  
 //{{AFX_DATA_INIT(CCaptureDlg) 5#f_1 V  
  m_bControl = FALSE; fGe ie m  
  m_bAlt = FALSE; s~(`~Y4  
  m_bShift = FALSE; = =pQ V[  
  m_Path = _T("c:\\"); )g8Kicox5  
  m_Number = _T("0 picture captured."); $HOe){G  
  nCount=0; Q$p3cepsK  
  bRegistered=FALSE; ;8MQ'#  
  bTray=FALSE; )Dhx6xM[a  
 //}}AFX_DATA_INIT ~FAk4z=Ed  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 = YO<.(Lu  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Zp{K_ec{  
} x76;wQ  
nvQX)Xf  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R!"`Po  
{ I+Yq",{%  
 CDialog::DoDataExchange(pDX); c]k+ Sx&}  
 //{{AFX_DATA_MAP(CCaptureDlg) HI:1Voy  
  DDX_Control(pDX, IDC_KEY, m_Key); N6BOUU]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); WS4DzuZZ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *7*cWO=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *=O3kUoL  
  DDX_Text(pDX, IDC_PATH, m_Path); UnVa`@P^:G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ib> ~3s;  
 //}}AFX_DATA_MAP TT;ls<(Lg  
} 9k9}57m.i  
'HV@i)h0%V  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x5g&?2[  
//{{AFX_MSG_MAP(CCaptureDlg) 8]#J_|A6Z  
 ON_WM_SYSCOMMAND() =s.0 f:(  
 ON_WM_PAINT() #$U/*~m $  
 ON_WM_QUERYDRAGICON() <M5fk?n,|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ryz NM3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) iSOyp\E|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _XT;   
//}}AFX_MSG_MAP 2Gj)fMK38  
END_MESSAGE_MAP() 4,YL15.  
R$dNdd9m  
BOOL CCaptureDlg::OnInitDialog() q3v5gz^t  
{ ntPX?/  
 CDialog::OnInitDialog(); N2j^fZd_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); WCqa[=v)t  
 ASSERT(IDM_ABOUTBOX < 0xF000); yoieWnL}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <7Yh<(R e^  
 if (pSysMenu != NULL) keQRS+9  
 { t<}N>%ZO  
  CString strAboutMenu; @!ja/Y^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !YO'u'4<aK  
  if (!strAboutMenu.IsEmpty()) Mg}/gO% o  
  { gE*7[*2?t  
   pSysMenu->AppendMenu(MF_SEPARATOR); zFYzus`>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'O2/PU2_  
  } f#I#24)RH  
 } T#Bj5H  
 SetIcon(m_hIcon, TRUE); // Set big icon G"L`9E<0V  
 SetIcon(m_hIcon, FALSE); // Set small icon 3,hu3"@k  
 m_Key.SetCurSel(0); Hd-g|'^K  
 RegisterHotkey(); 805oV(-  
 CMenu* pMenu=GetSystemMenu(FALSE); P%R9\iajH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;ioF'ov  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Zf??/+[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fpO2bD%$8  
 return TRUE; // return TRUE unless you set the focus to a control l  LBzY`j  
} G|t0no\f  
!"hzGgOOX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vq3:N'  
{ 5L7 nEia'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;1_3E2E$  
 { I 5ZDP|  
  CAboutDlg dlgAbout; &oZU=CN  
  dlgAbout.DoModal(); 77+3CME{'  
 } 9@Cu5U]  
 else eQ[}ALIq  
 { ;jPiD`Kyv  
  CDialog::OnSysCommand(nID, lParam); f }.t  
 } H|`D3z.c  
} ^e\$g2).  
9R-2\D]  
void CCaptureDlg::OnPaint() "8a ?K Q  
{ ~`$P-^u88X  
 if (IsIconic()) G~_D'o<r  
 { ,5T1QWn^f  
  CPaintDC dc(this); // device context for painting Y}C|4"V  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @S5HMJ2=  
  // Center icon in client rectangle *].qm g%  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8aM\B%NGWi  
  int cyIcon = GetSystemMetrics(SM_CYICON); p*1 B *R  
  CRect rect; R S>qP;V*-  
  GetClientRect(&rect); sC2NFb-+&  
  int x = (rect.Width() - cxIcon + 1) / 2; O^ &m  
  int y = (rect.Height() - cyIcon + 1) / 2; N<Ym&$xR  
  // Draw the icon L0{ [L  
  dc.DrawIcon(x, y, m_hIcon); )3 f\H  
 } q^ &r<i  
 else z/WGL  
 { X -=M>H^  
  CDialog::OnPaint(); u35"oLV6}#  
 } DV>;sCMJ %  
} LU@1Gol  
f+)LVT8p  
HCURSOR CCaptureDlg::OnQueryDragIcon() nq+6ipx  
{ =E(ed,gH8  
 return (HCURSOR) m_hIcon; CQ{{J{pU"  
} Vvfd?G"  
zyP/'X_~:  
void CCaptureDlg::OnCancel() 7.)_H   
{ 3'0Jn6(  
 if(bTray) tef>Py  
  DeleteIcon(); D=.Ob<m`Z  
  CDialog::OnCancel(); zITxJx  
} /Ah'KN|EN  
%z.d;[Hs  
void CCaptureDlg::OnAbout() DqmKD U  
{ /+ais 3  
 CAboutDlg dlg; NMC0y|G  
 dlg.DoModal(); \PG_i'R  
} hOFvM&$  
>r}?v3QW  
void CCaptureDlg::OnBrowse() .*W7Z8!e  
{ :v$)Z~  
 CString str; tehWGqx)  
 BROWSEINFO bi; Fo~q35uB  
 char name[MAX_PATH]; $S2 /*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tWaGCxaE  
 bi.hwndOwner=GetSafeHwnd(); 7A$mZPKh  
 bi.pszDisplayName=name; O@dK^o  
 bi.lpszTitle="Select folder"; v:9'k~4)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; LN5q_ZvR  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~6QV?j  
 if(idl==NULL) J*:_3Wsy  
  return; 497l2}0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qwn EVjf  
 str.ReleaseBuffer(); pu ?CO A  
 m_Path=str; }w >UNGUMh  
 if(str.GetAt(str.GetLength()-1)!='\\') $ )2zz>4  
  m_Path+="\\"; L`9.Gf  
 UpdateData(FALSE); E7w^A  
} . _Jypk8  
cbzS7q<)  
void CCaptureDlg::SaveBmp() 8|L5nQ  
{ & \"cV0  
 CDC dc; WYcZD_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %@ q2  
 CBitmap bm; vkG%w;  
 int Width=GetSystemMetrics(SM_CXSCREEN); yWT1CID  
 int Height=GetSystemMetrics(SM_CYSCREEN); CC$rt2\e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )!G 10  
 CDC tdc; z?UEn#E2  
 tdc.CreateCompatibleDC(&dc); nhZ/^`Y<  
 CBitmap*pOld=tdc.SelectObject(&bm); PTXS8e4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /_8nZVu  
 tdc.SelectObject(pOld); G<`(d@g  
 BITMAP btm; rH\oFCzC  
 bm.GetBitmap(&btm); _oefp*iWS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7,uD7R_  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [;:ocy  
 BITMAPINFOHEADER bih; CkV -L4Jq  
 bih.biBitCount=btm.bmBitsPixel; r5$!41   
 bih.biClrImportant=0; VOg'_#I  
 bih.biClrUsed=0; -?IF'5z  
 bih.biCompression=0; ``{GU}n  
 bih.biHeight=btm.bmHeight; #P!M"_z  
 bih.biPlanes=1; xsS;<uCD  
 bih.biSize=sizeof(BITMAPINFOHEADER); Of9 gS-m  
 bih.biSizeImage=size; K05T`+N,  
 bih.biWidth=btm.bmWidth; q$ j  
 bih.biXPelsPerMeter=0; A\E ))b9+  
 bih.biYPelsPerMeter=0; #~w~k+E4  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g~9b_PY9  
 static int filecount=0; $d.Dk4.ed  
 CString name; V<PH5'^$j  
 name.Format("pict%04d.bmp",filecount++); j*GS')Cm  
 name=m_Path+name; |}X[Yg=FG  
 BITMAPFILEHEADER bfh; ;.R) uCd{=  
 bfh.bfReserved1=bfh.bfReserved2=0; ?T|0"|\"'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 66_=bd(9  
 bfh.bfSize=54+size; E4_,EeC#  
 bfh.bfOffBits=54; y T&#k1  
 CFile bf; %ca`v;].  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :n%&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A#i[Us|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g$/7km{TP  
  bf.WriteHuge(lpData,size); fy&u[Jd{  
  bf.Close(); 2l:cP2fa  
  nCount++; !g#y$  
 } K(TejW#  
 GlobalFreePtr(lpData); =xSf-\F  
 if(nCount==1) q$K}Fm1C  
  m_Number.Format("%d picture captured.",nCount); h b}QtQ  
 else >S{8sN  
  m_Number.Format("%d pictures captured.",nCount); "Rtt~["%  
  UpdateData(FALSE); =&FaMR2  
} {/48n83n  
[O]rf+NZ(5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G6JP3dOT  
{ oMoco tQ;$  
 if(pMsg -> message == WM_KEYDOWN) S&J5QZjC  
 { 3Lv5>[MnN  
  if(pMsg -> wParam == VK_ESCAPE) rA8{Q.L  
   return TRUE; tv: mjS  
  if(pMsg -> wParam == VK_RETURN) Z=a~0&G  
   return TRUE; kcMg`pJ4<  
 } dqFp"Xe"%  
 return CDialog::PreTranslateMessage(pMsg); g+?2@L$L  
} "2 :zWh7|  
s={IKU&m[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /^X)>1)j  
{ WB `h)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "/3YV%to-#  
  SaveBmp(); t=jG$A  
  return FALSE; K@:t6  
} 3l$D%y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lW4 6S  
 CMenu pop; i4M%{]G3Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ies` !W^  
 CMenu*pMenu=pop.GetSubMenu(0); \}YAQ'T  
 pMenu->SetDefaultItem(ID_EXITICON); m5, &;~  
 CPoint pt; "QBl "<<s  
 GetCursorPos(&pt); Zv8_<>e  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  ?H_>?,^  
 if(id==ID_EXITICON) \pP1k.~UnC  
  DeleteIcon(); 5Ux=5a  
 else if(id==ID_EXIT) <@0S]jy  
  OnCancel(); Q6N?cQtOT  
 return FALSE; pA_e{P/  
} rdAy '38g  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2~V"[26t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \zOsq5}  
 AddIcon(); !lM.1gTTC  
 return res; [Ov/&jD"  
} aO bp"  
g*w}m>O  
void CCaptureDlg::AddIcon() JLg/fB3%  
{  OAgZeK$  
 NOTIFYICONDATA data; )XoMOz  
 data.cbSize=sizeof(NOTIFYICONDATA); k3]qpWKj  
 CString tip; Q"3gvIyc  
 tip.LoadString(IDS_ICONTIP); HLL=.: P  
 data.hIcon=GetIcon(0); pkTVQdtRG  
 data.hWnd=GetSafeHwnd(); b%d,X-3  
 strcpy(data.szTip,tip); `v'yGsIV  
 data.uCallbackMessage=IDM_SHELL; lc]cs D  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @iBmOt>3  
 data.uID=98; g(G$*#}o8A  
 Shell_NotifyIcon(NIM_ADD,&data); SN[ar&I  
 ShowWindow(SW_HIDE); P5GV9SA  
 bTray=TRUE; Rh)%;  
} RRl`;w?  
XQtV$Lw  
void CCaptureDlg::DeleteIcon() 6:?mz;oP  
{ j*d+WZm8-g  
 NOTIFYICONDATA data; LX=cx$K  
 data.cbSize=sizeof(NOTIFYICONDATA); %Z-xh< &  
 data.hWnd=GetSafeHwnd(); {Eqx'j  
 data.uID=98; r-Y7wM`TZ  
 Shell_NotifyIcon(NIM_DELETE,&data); +k/=L9#e  
 ShowWindow(SW_SHOW); wbg ?IvY[  
 SetForegroundWindow(); K1&t>2=%  
 ShowWindow(SW_SHOWNORMAL); _3#_6>=M  
 bTray=FALSE; $)KNpdXh  
} SA%)xGRW  
rMw$T=Oi  
void CCaptureDlg::OnChange() k"m+i  
{ t%@u)bp  
 RegisterHotkey(); Zb'a+8[  
} H;ujB \+  
j8^zE,Z  
BOOL CCaptureDlg::RegisterHotkey() m8+ EMBl  
{ }?HWUAL\  
 UpdateData(); A-rj: k!  
 UCHAR mask=0; ,-DU)&dF  
 UCHAR key=0; $FZcvo3@*S  
 if(m_bControl) %MCS_'N J  
  mask|=4; NSq29#  
 if(m_bAlt) |qU~({=b  
  mask|=2; 43~v1pf{!  
 if(m_bShift) H.o3d/8:  
  mask|=1; Ag&K@%|*  
  key=Key_Table[m_Key.GetCurSel()]; /_yAd,^-+  
 if(bRegistered){ h<n2pz}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kUr/*an  
  bRegistered=FALSE; R38 \&F  
 } Yjl:i*u/  
 cMask=mask; 8A u W>7_  
 cKey=key; |;I"Oc.w^R  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7f<@+&  
 return bRegistered; `(6cRT`Wp  
} ~B7<Yg  
VZ7E#z+nM#  
  四、小结 *?>52 -&b  
ih |&q  
  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