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用Visual C++实现屏幕抓图程序

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 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: x}_]A$nV  
  Ir {OheJ  
  一、实现方法 =T -&j60  
xAK6pDp  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: lt ^GvWg  
FoNSM$x  
#pragma data_seg("shareddata") [h^2Y&Au5  
HHOOK hHook =NULL; //钩子句柄 M^O2\G#B  
UINT nHookCount =0; //挂接的程序数目 *C5R}9O5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 isQ[ Gc!8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !B\R''J5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,VCyG:dw  
static int KeyCount =0; brW :C? }  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3?c3<`TW  
#pragma data_seg() ?\vh9  
'm4W}F  
  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。 )Hpa}FGT  
B P2=2)Q  
  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: Ka[t75~;  
xC{qV,   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR uehDIl0\[b  
cKey,UCHAR cMask) ,5|&A  
{ **$LR<L  
 BOOL bAdded=FALSE; )we}6sE"  
 for(int index=0;index<MAX_KEY;index++){ .}q&5v  
  if(hCallWnd[index]==0){ o<[#0T^K   
   hCallWnd[index]=hWnd; |_] Q$q[[%  
   HotKey[index]=cKey; H=g`hF]`  
   HotKeyMask[index]=cMask; G+%zn|  
   bAdded=TRUE; qT%FmX  
   KeyCount++; I$<<(VWH  
   break; d/ARm-D  
  } eZSNNgD<:  
 } &X|#R1\  
 return bAdded; e7m*rh%5>  
} -db_E#  
//删除热键 P+s !|7'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P* w9 ,  
{ }\%Fi/6Z{  
 BOOL bRemoved=FALSE; $ {O#  
 for(int index=0;index<MAX_KEY;index++){ Km(n7Ah"  
  if(hCallWnd[index]==hWnd){ LW[9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :[O 8  
    hCallWnd[index]=NULL; ()5[x.xK@  
    HotKey[index]=0; ,quoRan  
    HotKeyMask[index]=0; L;*ljZ^c  
    bRemoved=TRUE; gu0j.XS^  
    KeyCount--; ^su<uG<R  
    break; :+qF8t[L  
   } W8ouO+wK  
  } `-(|>5wWS  
 } =T(6#"  
 return bRemoved; Ove<mFI\  
} l|/ep:x8  
7s/u(~d)  
.@(6Y<dN  
  DLL中的钩子函数如下: cd(GvX'  
H,DM1Z9rz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V!lZ\)  
{ g]4(g<:O  
 BOOL bProcessed=FALSE; >Db;yC&  
 if(HC_ACTION==nCode) Ov-icDMm  
 { $6mX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~io szX  
   switch(wParam) 43mP]*=A  
   {  ^G4 P y<s  
    case VK_MENU: .!f$ \1l  
     MaskBits&=~ALTBIT; *v9 2  
     break; K('hC)1  
    case VK_CONTROL: 7J EbH?lEN  
     MaskBits&=~CTRLBIT; wgamshm"d  
     break; \#Pfj &*  
    case VK_SHIFT: )Xv ilCk1  
     MaskBits&=~SHIFTBIT; _a6[{_Pc  
     break; ~yH?=:>U  
    default: //judge the key and send message U*22h` S  
     break; t .7?  
   } QR%mj*@Wle  
   for(int index=0;index<MAX_KEY;index++){ $wo?!gt  
    if(hCallWnd[index]==NULL) }T&iewk  
     continue; NYrQ$N"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fA+ ,TEB~d  
    { v2B0q4*BS?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =<?+#-;p  
     bProcessed=TRUE; p-Kz-+A[  
    } / c AUl  
   } DNr@u/>vB  
  } M luVx'  
  else if((lParam&0xc000ffff)==1){ //有键按下 :cF[(i/k4  
   switch(wParam) /atW8 `&  
   { R)QC)U  
    case VK_MENU: V:VO[e<e  
     MaskBits|=ALTBIT; ~GL] wF2#  
     break; G LIi6  
    case VK_CONTROL: aqj@Cjk4Z  
     MaskBits|=CTRLBIT; ,.OERw  
     break; (NF~Ck$#q  
    case VK_SHIFT: @GdbTd  
     MaskBits|=SHIFTBIT; ";3zX k[#  
     break; vUohtS*  
    default: //judge the key and send message 2QJ{a46}  
     break; dwDcR,z?a  
   } 2E}*v5b,  
   for(int index=0;index<MAX_KEY;index++){ P_*" dza  
    if(hCallWnd[index]==NULL) <Bw^!.jAF  
     continue; X!9 B2w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KX'{[7}m'  
    { v7iuL6jl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &e#~<Wm82  
     bProcessed=TRUE; Jl#%uU/sx  
    } &6ZD136  
   } BYVY)<v/  
  } q,93nhs "  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 23RN}LUi  
   for(int index=0;index<MAX_KEY;index++){ Rm255z p  
    if(hCallWnd[index]==NULL) 59"UL\3  
     continue; 3|'>`!hb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #~C]ZrK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vgfcCcZ_iZ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 D-5VC9{  
   } #a'Ex=%rM  
  } mi,E-  
 } P<M?Qd 1.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e\!0<d  
} t!r A%*  
j4|N- :  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Kx;eaz:gx  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .J)I | '  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6W]9$n\"?  
M%2+y5  
  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: ?0v-qj+  
y5 *Z 3"<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =a@j=  
{ -* WXMzr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DAcQz4T`  
 { = kJ,%\E`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :h\Q;?  
  SaveBmp(); Ji>o!  
  return FALSE; n%-R[vW  
 } W4pL ,(S  
 …… //其它处理及默认处理 Gd-'Z_b  
} <<+\X:,  
@mw5~+  
k <=//r  
  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。 ca7=V/i_a{  
k1{K*O$e  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 wt!nMQ  
lDYyqG4  
  二、编程步骤 VF?<{F  
Y }$/e  
  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"; ow_W%I=6  
=&ks)MH-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;<Ar=?  
Jk7|{W\OA  
  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; {`LU+  
M>~Drul  
  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; UNom-  
Tn*9lj4  
  5、 添加代码,编译运行程序。 pWK(z[D  
/& Jan:  
三、程序代码 x[h^[oF0  
8ZM&(Lz7u  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *K|W /'_&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nqI@Y)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ eg(6^:z?f  
#if _MSC_VER > 1000 FbS|~Rp~  
#pragma once + +M$#Er&  
#endif // _MSC_VER > 1000 'ig&$fzb  
#ifndef __AFXWIN_H__ ,z;cbsV-{  
#error include 'stdafx.h' before including this file for PCH Cs9.&Y  
#endif jcuB  
#include "resource.h" // main symbols ^l9N48]|?  
class CHookApp : public CWinApp 9 Vkb>yFX'  
{ Nl^;A> <u  
 public: mZSD(  
  CHookApp(); _jLL_GD  
  // Overrides L ^q""[  
  // ClassWizard generated virtual function overrides w80oXXs[#  
  //{{AFX_VIRTUAL(CHookApp) cq}EZ@ .  
 public: `Aw^H!  
  virtual BOOL InitInstance(); *5%d XixN  
  virtual int ExitInstance(); =Je[c,&j$?  
  //}}AFX_VIRTUAL +S>j0m<*  
  //{{AFX_MSG(CHookApp) Al}6q{E9+8  
  // NOTE - the ClassWizard will add and remove member functions here. cAY:AtD  
  // DO NOT EDIT what you see in these blocks of generated code ! _FpTFfB  
  //}}AFX_MSG AK'[c+2[  
  DECLARE_MESSAGE_MAP() Fq |Ni$  
}; B:'J `M"N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 41`n1:-]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZCmgs4W!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LAB=Vp1y3[  
BOOL InitHotkey(); ,?>s>bHV  
BOOL UnInit(); ii T"5`KY  
#endif >/l? g5{  
* @ 3Ag(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. w,#>G07D  
#include "stdafx.h" em,u(#)&  
#include "hook.h" )c8rz[i  
#include <windowsx.h> fmU {  
#ifdef _DEBUG 8(pp2rlR  
#define new DEBUG_NEW a1EOJ^}0  
#undef THIS_FILE &"yx<&c}  
static char THIS_FILE[] = __FILE__; t;W0"ci9  
#endif \.MR""@y`{  
#define MAX_KEY 100 `[f*Zv w  
#define CTRLBIT 0x04 39:bzUIF  
#define ALTBIT 0x02 ?9e_gV{&;  
#define SHIFTBIT 0x01 @.$|w>>T  
#pragma data_seg("shareddata") 1eS&&J5  
HHOOK hHook =NULL; ]Lf{Jboo  
UINT nHookCount =0; Zq+v6fk_Mn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >3p \m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT S\:P-&dC  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ZP@ $Q%up  
static int KeyCount =0; wPQH(~k:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift cG[l!Z  
#pragma data_seg() .~~nUu+M  
HINSTANCE hins; 8&GBV_`I  
void VerifyWindow(); tXNm$Cq.|  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !%CWZZ 6u  
//{{AFX_MSG_MAP(CHookApp) g;pcZ9o  
// NOTE - the ClassWizard will add and remove mapping macros here. s'!Cp=xQF"  
// DO NOT EDIT what you see in these blocks of generated code! d' !]ZWe  
//}}AFX_MSG_MAP RIlwdt  
END_MESSAGE_MAP() ns9U/ :L  
/rK}?U  
CHookApp::CHookApp() uaT!(Y6  
{ Q_"]+i]s@  
 // TODO: add construction code here, SF7\<'4\N  
 // Place all significant initialization in InitInstance 3O,+=?VK  
} dq(uVW^&ae  
a zCf  
CHookApp theApp; \y97W&AN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gH12[Us'`  
{ Z InpMp  
 BOOL bProcessed=FALSE; cS5Pl  
 if(HC_ACTION==nCode) NCiW^#b  
 { *Fy2BZH%Q  
  if((lParam&0xc0000000)==0xc0000000){// Key up VEWi_;=J1  
   switch(wParam) \:b3~%Fz  
   { >")Tf6zw&  
    case VK_MENU: >"^ O"E  
     MaskBits&=~ALTBIT; Nv#t:J9f  
     break; Oxm>c[R  
    case VK_CONTROL: LhA*F[6$M  
     MaskBits&=~CTRLBIT; qX/y5F`  
     break; v[ . cd*b  
    case VK_SHIFT: MLXNZd   
     MaskBits&=~SHIFTBIT; N-G1h?e4  
     break; fT;s-v[`k  
    default: //judge the key and send message joFm]3$;  
     break; ,f~J`3(&  
   } "sS}N%!  
   for(int index=0;index<MAX_KEY;index++){ 1Ir21un  
    if(hCallWnd[index]==NULL) I3a NFa}  
     continue; 6/5YjO|a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nr95YSH  
    { n`#tKwWHYx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2<i!{;u$qL  
     bProcessed=TRUE; '=39+*6?  
    } PY{ G [  
   } d(\%Os   
  } sZjQ3*<-r  
  else if((lParam&0xc000ffff)==1){ //Key down G? ])o5  
   switch(wParam) <`.X$r*  
   { o)h_H;  
    case VK_MENU: P@Hs`=  
     MaskBits|=ALTBIT; "i nd$Z`c  
     break; V[RF </2T  
    case VK_CONTROL: U_Vs.M.p  
     MaskBits|=CTRLBIT; `tB gH_$M  
     break; . k#U]M  
    case VK_SHIFT: >=qf/K +#  
     MaskBits|=SHIFTBIT; }u\])I3  
     break; $:8x(&+/@  
    default: //judge the key and send message m}C>ti`VD  
     break; ap.K=-H  
   } rA3$3GLQ-  
   for(int index=0;index<MAX_KEY;index++) Jb0`42  
   { 5y d MMb  
    if(hCallWnd[index]==NULL) lNz7u:U3  
     continue; 'H3^e}   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @ju@WY45$^  
    { ;ic3).H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |LRedD7n  
     bProcessed=TRUE; 6^V=?~a&z  
    } eX?OYDDC0j  
   } |nc@"OJ  
  } HguT"%iv  
  if(!bProcessed){ ,$@bE  
   for(int index=0;index<MAX_KEY;index++){ _G[g;$ <  
    if(hCallWnd[index]==NULL) sQ=]NF)\  
     continue; sGi"rg#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S ^"y4- 2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )SaGH3~*C  
   } ?ME6+Z\  
  } hcgMZT!<5  
 } 9%k2'iV7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?8I?'\F;  
} zkt+7,vI  
<->{  
BOOL InitHotkey() R] vV*  
{ KxI&G%z  
 if(hHook!=NULL){ Tre]"2l  
  nHookCount++; /'Ass(=6  
  return TRUE; *U^6u/iH  
 } $~~Jw]   
 else Za/-i"U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /@wg>&L]  
  if(hHook!=NULL) bENdMH";  
   nHookCount++; bZ?v-fn\D,  
  return (hHook!=NULL); q2/pNV#  
} rxVanDb=W  
BOOL UnInit() FTH|9OP  
{ 1A?W:'N  
 if(nHookCount>1){ mf A{3  
  nHookCount--; TcyNIx  
  return TRUE; #9B)Xx!g  
 } J; 3{3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); qt"G[9;  
 if(unhooked==TRUE){ k|v3.< -  
  nHookCount=0; Rvkedb  
  hHook=NULL; ^T( .k=  
 } T%x}Y#U'`  
 return unhooked; AhCW'.  
} g9m-TkNk  
4qphA9i1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h(<,fg1  
{ 3YeG$^y"  
 BOOL bAdded=FALSE; P!$Zx)T  
 for(int index=0;index<MAX_KEY;index++){  H_B4  
  if(hCallWnd[index]==0){ qPWP&k  
   hCallWnd[index]=hWnd; gcii9vz `  
   HotKey[index]=cKey; q VjdOY:z  
   HotKeyMask[index]=cMask; e2L0VXbb  
   bAdded=TRUE; 6}Vf\j~  
   KeyCount++; aFc1|.Nm  
   break; .4_o>D  
  } A|CmlAW~^  
 } \(J8#V  
 return bAdded; %OtFHhb  
} Bp*K]3_  
6~0$Z-);(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z_PNI#h*  
{ Rh3eLt~|(  
 BOOL bRemoved=FALSE; HpR]q05d  
 for(int index=0;index<MAX_KEY;index++){ a[v0%W ]u  
  if(hCallWnd[index]==hWnd){ 5uGqX"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]O Z5 fd  
    hCallWnd[index]=NULL; t#yk ->,  
    HotKey[index]=0; O1rvaOlr  
    HotKeyMask[index]=0; NWP5If|'X  
    bRemoved=TRUE; LnFdhrB@x  
    KeyCount--; 7WZrSC  
    break; ,ZKr .`B  
   } LZ\q3 7UV  
  } }xKP~h'F  
 } ,368d9,rDz  
 return bRemoved; PvR6 z0  
} < z+t,<3D  
7.-V-?i  
void VerifyWindow() anuL1f XO  
{ BoA/6FRi[  
 for(int i=0;i<MAX_KEY;i++){ 68bQ;Dv  
  if(hCallWnd!=NULL){ k=2Lo  
   if(!IsWindow(hCallWnd)){ =31"fS@  
    hCallWnd=NULL; { .n"Z  
    HotKey=0; +~St !QV%  
    HotKeyMask=0; 2:*w~|6>}5  
    KeyCount--; [l:x'_y  
   } i}b${n o  
  } r~[Ia!U?  
 } m9)p-1y@5  
} 6f;fx}y  
3yANv?$a  
BOOL CHookApp::InitInstance() -1Jg?cPz k  
{ '#! gh?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); {Z{75}  
 hins=AfxGetInstanceHandle(); TH)"wNa  
 InitHotkey(); hrmut*<|  
 return CWinApp::InitInstance(); .=U#eHBdAQ  
} Pnw]Tm}g  
zh4# A <e  
int CHookApp::ExitInstance() o-;E>N7t  
{ ~Xr=4V:a+  
 VerifyWindow(); W"724fwu&  
 UnInit(); 5&xB6|k  
 return CWinApp::ExitInstance(); =6xrfDbN8  
} O[# 27_dH  
c~6>1w7SZ4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file sPd Gw~{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) so^lb?g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ TP VVck-T8  
#if _MSC_VER > 1000 tv>>l%  
#pragma once U -Y03  
#endif // _MSC_VER > 1000 85lCj-cs  
:WQ^j!9'  
class CCaptureDlg : public CDialog 2*rH?dz8E  
{ V=)_yIS  
 // Construction ^F>cp ,x  
 public: k- Q%.o  
  BOOL bTray; ot @|!V  
  BOOL bRegistered; hZ[E7=NTQ^  
  BOOL RegisterHotkey(); Yv hA_v  
  UCHAR cKey; "b?v?V0%C  
  UCHAR cMask; e}mD]O}  
  void DeleteIcon(); K )[]fm  
  void AddIcon(); nJbtS#`G4  
  UINT nCount; _4TH4~cY  
  void SaveBmp(); qd+h$ "p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor W>!_|[a  
  // Dialog Data ekI2icD  
  //{{AFX_DATA(CCaptureDlg) A2^\q>_#  
  enum { IDD = IDD_CAPTURE_DIALOG }; jATI&oX  
  CComboBox m_Key; og4UhP^UET  
  BOOL m_bControl; yPM3a7-Bm  
  BOOL m_bAlt; ;V^ 112|C  
  BOOL m_bShift; BLN^ <X/  
  CString m_Path; ilK-?@u+  
  CString m_Number; ~+bv6qxg]\  
  //}}AFX_DATA {zQS$VhXr  
  // ClassWizard generated virtual function overrides 7:A x(El  
  //{{AFX_VIRTUAL(CCaptureDlg) )q 0.0<f  
 public: M@h|bN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); CQwL|$)]Y  
 protected: G,TM-l_uw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FSUttg"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qs|mj}?  
  //}}AFX_VIRTUAL . 7zK@6i  
  // Implementation |M8WyW  
 protected: A"`foI$0  
  HICON m_hIcon; %cCs?ic  
  // Generated message map functions =PUt&`1.a  
  //{{AFX_MSG(CCaptureDlg) j lp:lX  
  virtual BOOL OnInitDialog(); u4m,'XR  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3:5 &Aa!  
  afx_msg void OnPaint(); <Gav5R c  
  afx_msg HCURSOR OnQueryDragIcon(); (*1v\Q  
  virtual void OnCancel(); |nbf'  
  afx_msg void OnAbout(); sBu=e7  
  afx_msg void OnBrowse(); N+zKr/  
  afx_msg void OnChange(); : q ti  
 //}}AFX_MSG Ib|Rf;J~-  
 DECLARE_MESSAGE_MAP() CL)lq)1(  
}; DKfE.p)  
#endif *"WDb|PBb  
J\J?yo 6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7uT:b!^f[  
#include "stdafx.h" a UxGzMZ  
#include "Capture.h" Kh(ZU^{n  
#include "CaptureDlg.h" cHcmgW\4  
#include <windowsx.h> I96C i2)m  
#pragma comment(lib,"hook.lib") !h(|\" }  
#ifdef _DEBUG \(VTt|}By$  
#define new DEBUG_NEW bfA=3S"0  
#undef THIS_FILE _FXZm50\g{  
static char THIS_FILE[] = __FILE__;  ]E_h  
#endif <WjF*x p  
#define IDM_SHELL WM_USER+1 Vm5c+;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qd=^S^}(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V?Z.\~  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; OS4q5;1#  
class CAboutDlg : public CDialog ?I/qE='*  
{ z>jUR,!GT  
 public: 48jVRo  
  CAboutDlg(); ikSF)r;*t  
  // Dialog Data $B kubWM  
  //{{AFX_DATA(CAboutDlg) WJNl5^  
  enum { IDD = IDD_ABOUTBOX }; 3 N7[.I>A  
  //}}AFX_DATA M~WijDj  
  // ClassWizard generated virtual function overrides LUH"  
  //{{AFX_VIRTUAL(CAboutDlg) RG3l.jL  
 protected: 3<k`+,'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u\LiSGePN  
  //}}AFX_VIRTUAL fLDg~;3  
  // Implementation 90|7ArM_[  
 protected: 6lk l7zm  
  //{{AFX_MSG(CAboutDlg) .fN"@l  
  //}}AFX_MSG &j?#3Qt'_  
  DECLARE_MESSAGE_MAP() zrR`ecC(b  
}; w^Lta  
gzBy?r> r  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |u0( t,T  
{ AtU v71D:  
 //{{AFX_DATA_INIT(CAboutDlg) o }3uo6GIB  
 //}}AFX_DATA_INIT 2H/Z_+\  
} .Q@S #d  
{88gW\GL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6el;Erp  
{ t<T[h2Wd  
 CDialog::DoDataExchange(pDX); ( {1e%  
 //{{AFX_DATA_MAP(CAboutDlg) &FH2fMLQ  
 //}}AFX_DATA_MAP 9R;/*$  
} }"|"Q7H  
psnTFe  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K`/`|1  
 //{{AFX_MSG_MAP(CAboutDlg) $&$w Y/F  
 // No message handlers |} {B1A  
 //}}AFX_MSG_MAP D\@m6=L  
END_MESSAGE_MAP() VR+<v   
l IUuA  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) GuGOePV  
: CDialog(CCaptureDlg::IDD, pParent) @HRC \OG  
{ ,ldI2 ]  
 //{{AFX_DATA_INIT(CCaptureDlg) [,K.*ZQi  
  m_bControl = FALSE; CT KG9 T  
  m_bAlt = FALSE; 0{[m%eSK'  
  m_bShift = FALSE; %1.]c6U  
  m_Path = _T("c:\\"); nSF``pp+  
  m_Number = _T("0 picture captured."); {fha`i  
  nCount=0; UA4J>1 i  
  bRegistered=FALSE; -+7uy.@cS  
  bTray=FALSE; ?lbH02P{v  
 //}}AFX_DATA_INIT ;<$H)`*  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !/^-;o7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Sr&515  
} ,g7.rEA  
a-"k/P#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "V>R9dO{"!  
{ q}/WQ]p} <  
 CDialog::DoDataExchange(pDX); uKz,SqX  
 //{{AFX_DATA_MAP(CCaptureDlg) i `s|,"0o  
  DDX_Control(pDX, IDC_KEY, m_Key); H;U)b{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); c&X{dJWD   
  DDX_Check(pDX, IDC_ALT, m_bAlt); o\88t){/kB  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  *[r!  
  DDX_Text(pDX, IDC_PATH, m_Path); L lw&& K  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %/c+`Wd/l$  
 //}}AFX_DATA_MAP b+6"#/s  
} oEx\j+}@n  
?Zc"C  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Rx*BwZ  
//{{AFX_MSG_MAP(CCaptureDlg) `%E8-]{uS  
 ON_WM_SYSCOMMAND() X=6y_^  
 ON_WM_PAINT() P+!"wX0*N  
 ON_WM_QUERYDRAGICON() i]=&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) EyI}{6~F  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ti2Ls5H}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `} m Q  
//}}AFX_MSG_MAP v?0r`<Mn  
END_MESSAGE_MAP() &-czStQ  
[U@ *1  
BOOL CCaptureDlg::OnInitDialog() nI/kw%<  
{ 3#vinz  
 CDialog::OnInitDialog(); "F3]X)}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~%/Wupf  
 ASSERT(IDM_ABOUTBOX < 0xF000); mCs#.%dU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &X|<@'933  
 if (pSysMenu != NULL) {TOmv  
 { h'i{&mS_b  
  CString strAboutMenu; SFb{o <0 =  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nLwiCf e  
  if (!strAboutMenu.IsEmpty()) zW}[+el }  
  { Io|X#\K  
   pSysMenu->AppendMenu(MF_SEPARATOR); 'S<%Xm  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L>!8YUz7p$  
  } TDg@Tg0  
 } ^pS+/ZSi^  
 SetIcon(m_hIcon, TRUE); // Set big icon !PMU O\y  
 SetIcon(m_hIcon, FALSE); // Set small icon & SAH2xR  
 m_Key.SetCurSel(0); c(U  
 RegisterHotkey(); [w0/\]o  
 CMenu* pMenu=GetSystemMenu(FALSE); Z2Zq'3*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); LuR,f"%2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )jCo%P/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d'*]ns  
 return TRUE; // return TRUE unless you set the focus to a control =(EI~N  
} E"%2)  
aYn8 ^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4J|t?]ij|E  
{ YC=S5;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T# lP!c  
 { WKpA|  
  CAboutDlg dlgAbout; B_ja&) !s1  
  dlgAbout.DoModal(); .}k(L4T|=  
 } nx:KoB"ny  
 else FP#FB$eP  
 { .lBgp=!  
  CDialog::OnSysCommand(nID, lParam); 1[E#vdbT  
 } 4Hb $0l  
} aup6?'G;  
_ 1*7Z=|  
void CCaptureDlg::OnPaint() 1`LXz3uBe  
{ 0G <hn8>  
 if (IsIconic()) Kzb`$CGK  
 { R0;ef D  
  CPaintDC dc(this); // device context for painting )9B:wc"  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G~wFnl%  
  // Center icon in client rectangle HPQ/~0$  
  int cxIcon = GetSystemMetrics(SM_CXICON); %d m-?`  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1|ZhPsD.}g  
  CRect rect; ++}\v9Er  
  GetClientRect(&rect); [pg}S#A  
  int x = (rect.Width() - cxIcon + 1) / 2; |!H?+Jj:  
  int y = (rect.Height() - cyIcon + 1) / 2; C#i UP|7hh  
  // Draw the icon {%.Lk'#9  
  dc.DrawIcon(x, y, m_hIcon); 4KI [D{  
 } sM\lO  
 else (X+s-4%  
 { h(B,d,q"  
  CDialog::OnPaint(); TFR( 4W  
 } r]P,9  
} b[@V Ya  
|<`.fOxJP  
HCURSOR CCaptureDlg::OnQueryDragIcon() Aaw(Ed  
{ bm}6{28R  
 return (HCURSOR) m_hIcon; `7+j0kV)  
} 9 L?;FY)_  
%8)W0WMe  
void CCaptureDlg::OnCancel() Qn:kz*:  
{ 0_yP\m  
 if(bTray) XM|%^ry  
  DeleteIcon(); i3mAfDF  
  CDialog::OnCancel(); b-@\R\T  
} 7S$&S;  
PT9v*3Bq~  
void CCaptureDlg::OnAbout() R4e&^tI@*  
{ Zg:gY"^  
 CAboutDlg dlg; (LJ@S eM;  
 dlg.DoModal(); ~V)?>)T  
} 0{^H]Y  
x.$1<w64t  
void CCaptureDlg::OnBrowse() 7ODaX.t->  
{ -DO&_`kn  
 CString str; wH"kk4^  
 BROWSEINFO bi; kII7z;<^`  
 char name[MAX_PATH]; RbQ <m!A  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); LH]CUfUrUE  
 bi.hwndOwner=GetSafeHwnd(); ad n|N  
 bi.pszDisplayName=name; \&}G]  
 bi.lpszTitle="Select folder"; :a3LS|W  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )%Y IGV;&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Di=9mHC  
 if(idl==NULL) beZ(o?uK  
  return; dl l%4Sd  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); noNm^hFL  
 str.ReleaseBuffer(); q]<xMg#nu  
 m_Path=str; , fb( WY  
 if(str.GetAt(str.GetLength()-1)!='\\') */OI *{Q  
  m_Path+="\\"; %85Icg  
 UpdateData(FALSE); W7UtA.2LT  
} L>Jd7; =  
rOl6lQW  
void CCaptureDlg::SaveBmp() FfMnul  
{ V!|e#}1 /  
 CDC dc; SFjU0*B$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]UNZd/hIL  
 CBitmap bm; Fa3gJ[ZAqf  
 int Width=GetSystemMetrics(SM_CXSCREEN); S|R|]J|  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3@5p"X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8&}~'4[b[$  
 CDC tdc; xRDiRj  
 tdc.CreateCompatibleDC(&dc); &K:' #[3V  
 CBitmap*pOld=tdc.SelectObject(&bm); #iis/6"  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); fk5XvL  
 tdc.SelectObject(pOld); A%ywj'|z  
 BITMAP btm; *,#q'!Hq  
 bm.GetBitmap(&btm); IftxSaP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0^_MN~s(X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); C|z%P}u#p  
 BITMAPINFOHEADER bih; #i@h{ R01  
 bih.biBitCount=btm.bmBitsPixel; %!.M~5mCd  
 bih.biClrImportant=0; t 6u-G+}  
 bih.biClrUsed=0; 4/wwn6I}G  
 bih.biCompression=0; {^&@g kYY  
 bih.biHeight=btm.bmHeight; aIvBY78o  
 bih.biPlanes=1; \~"#ld(x7  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6w#nkF  
 bih.biSizeImage=size; DBbc|I/[l  
 bih.biWidth=btm.bmWidth; ,5-Zb3\  
 bih.biXPelsPerMeter=0; ?ow'^X-  
 bih.biYPelsPerMeter=0; PM~*|(fA  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); aIGn9:\  
 static int filecount=0; _J"mR]I+  
 CString name; &?a.mh/8[[  
 name.Format("pict%04d.bmp",filecount++); QjukK6#W  
 name=m_Path+name; mf*Nr0L;J  
 BITMAPFILEHEADER bfh; R40W'N 1%q  
 bfh.bfReserved1=bfh.bfReserved2=0; F +j O*F2h  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fuSq ={]  
 bfh.bfSize=54+size;  t.3 \/  
 bfh.bfOffBits=54; 0K3Hf^>m  
 CFile bf; jmW^`%;7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !Q[}s #g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Oje|bxQ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I]sqi#h$2W  
  bf.WriteHuge(lpData,size); 7,_-XV2  
  bf.Close(); \j:gr>4  
  nCount++; E\e]K !  
 } d)*(KhYie@  
 GlobalFreePtr(lpData); _'*DT=H'U  
 if(nCount==1) wr@GN8e`  
  m_Number.Format("%d picture captured.",nCount); u 2lX d'  
 else +#v4B?NR  
  m_Number.Format("%d pictures captured.",nCount); |[wyc!nY).  
  UpdateData(FALSE); <kc]L x  
} <;KRj85"j  
u[`v&e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i wz` x  
{ @aB9%An1  
 if(pMsg -> message == WM_KEYDOWN) }=pOiILvD  
 { QV)}3pW  
  if(pMsg -> wParam == VK_ESCAPE) Gm@iV,F%R  
   return TRUE; FuMq|S  
  if(pMsg -> wParam == VK_RETURN) r } 7:#XQ  
   return TRUE; ib Ue*Z["1  
 } e 2*F;.)  
 return CDialog::PreTranslateMessage(pMsg); LV=^jsQ5  
} ^?Vq L\V5  
DB Xm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M7U:g}  
{ -RCv7U`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !d|8'^gc  
  SaveBmp(); x[}06k'  
  return FALSE; E8;TLk4\  
} El1:?4;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zPE#[\O21B  
 CMenu pop; %Ht ^yemQ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;siJ~|6)  
 CMenu*pMenu=pop.GetSubMenu(0); b7f0#*(?  
 pMenu->SetDefaultItem(ID_EXITICON); 0Q*-g}wXfS  
 CPoint pt; %g-0O#8}  
 GetCursorPos(&pt); LI:?Y_r  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;x RjQR  
 if(id==ID_EXITICON) y"Ihr5S\  
  DeleteIcon(); 9C1b^^Kb  
 else if(id==ID_EXIT) 45r|1<Ro  
  OnCancel(); 8v$ g  
 return FALSE; X o_] v  
} =u[rOU{X"W  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1bDJ}M~]z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \SzGzCJ  
 AddIcon(); t_Z _!Qy  
 return res; >~>{;Wq(p+  
} dWIZ37w+D  
Ku&*`dME  
void CCaptureDlg::AddIcon() {SHqW5VX  
{ /9TL&_A-T  
 NOTIFYICONDATA data; iZu:uMoc  
 data.cbSize=sizeof(NOTIFYICONDATA); lSs^A@s  
 CString tip; 8q{1E];:q  
 tip.LoadString(IDS_ICONTIP); ${CYDD"mdy  
 data.hIcon=GetIcon(0); %,Q;<axzi  
 data.hWnd=GetSafeHwnd(); Yg|l?d"  
 strcpy(data.szTip,tip); $KH@,;Xz  
 data.uCallbackMessage=IDM_SHELL; kYTOldfY2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E.U0qK],  
 data.uID=98; sMN>wbHwh[  
 Shell_NotifyIcon(NIM_ADD,&data); ^h"n03VFA  
 ShowWindow(SW_HIDE); t3Qm-J}wSB  
 bTray=TRUE; 7rJ9 }/<I  
} B[Ix?V4yy  
kYmo7  
void CCaptureDlg::DeleteIcon() vsw7|  
{ lbG}noqb  
 NOTIFYICONDATA data; s?~8O|Mu'  
 data.cbSize=sizeof(NOTIFYICONDATA); B5 tx f.  
 data.hWnd=GetSafeHwnd(); a5>)?m  
 data.uID=98; \&# p1K(H  
 Shell_NotifyIcon(NIM_DELETE,&data); {4o\S  
 ShowWindow(SW_SHOW); g8rp|MOH  
 SetForegroundWindow(); _u`B3iG  
 ShowWindow(SW_SHOWNORMAL); 6S2r  
 bTray=FALSE; lJ("6aT?  
} rS=tcB O  
c-ttds  
void CCaptureDlg::OnChange() sio)_8tp  
{ } =xI3;7  
 RegisterHotkey(); /bu'6/!`  
} KuU3DTS85Z  
.wM:YX'[G  
BOOL CCaptureDlg::RegisterHotkey() 65;|cmjv  
{ 4LJ]l:m  
 UpdateData(); zuU Q."#i  
 UCHAR mask=0; Q*,6X*W!~  
 UCHAR key=0; [}jj<!9A_;  
 if(m_bControl) ?'TA!MR  
  mask|=4; 3"f)*w7d  
 if(m_bAlt) DBLA% {05  
  mask|=2; -MQZiq7H4  
 if(m_bShift) B-B?Ff>  
  mask|=1; g"TPII$  
  key=Key_Table[m_Key.GetCurSel()]; :QxL 9&"  
 if(bRegistered){ +p8qsT#7  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); T-hU+(+hg  
  bRegistered=FALSE; 9*7Hoi4Ji  
 } M" xZz  
 cMask=mask; JTSq{NN  
 cKey=key; v&k>0lV, ^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l7!U),x%/U  
 return bRegistered; )PsN_ 42~  
} XKpL4]{&q4  
m]{<Ux  
  四、小结 )RpqZe/h4  
y|FBYcn#F  
  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。
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