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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: 3Ur_?PM+C  
  "Vl4=W)u  
  一、实现方法 :Sd`4"AA  
sz/^Ie-~  
  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: pJ1\@G  
/+`%u&<  
#pragma data_seg("shareddata") .)bNi*&  
HHOOK hHook =NULL; //钩子句柄 _4nm h0q4  
UINT nHookCount =0; //挂接的程序数目 $'eY-U8q  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 -w"lW7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :r "G Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;-"q;&1e  
static int KeyCount =0; [lSQMoi3  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 P{n*X  
#pragma data_seg()  W{Z 7=  
W?kJ+1"(  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 m`$Q/SyvG  
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  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: q=`n3+N_H~  
&\cS{35  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /joY? T  
cKey,UCHAR cMask) nnT#S  
{ +%klS `_  
 BOOL bAdded=FALSE; ,g0t&jITo  
 for(int index=0;index<MAX_KEY;index++){ Np$&8v+en  
  if(hCallWnd[index]==0){ o-l-Z|)7  
   hCallWnd[index]=hWnd; FZ]+(Q"]:  
   HotKey[index]=cKey; YXqYIG.G  
   HotKeyMask[index]=cMask; 88S:E7 $  
   bAdded=TRUE; i0+e3!QU  
   KeyCount++; I#;dS!W"'  
   break; [ "3s  
  } .Oc j|A6  
 } (.Ak*  
 return bAdded;  CDuA2e  
} *pnaj\  
//删除热键 |`o1B;lc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w8UUeF  
{ t18j2P>`  
 BOOL bRemoved=FALSE; EVaHb;  
 for(int index=0;index<MAX_KEY;index++){ K*,,j\Q.  
  if(hCallWnd[index]==hWnd){ Q}<QE:-&E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yVGf[ ~X  
    hCallWnd[index]=NULL; @Y.r ,q  
    HotKey[index]=0; FAM:; F30  
    HotKeyMask[index]=0; E11C@%  
    bRemoved=TRUE; (5th   
    KeyCount--; $- %um  
    break; 5cU:wc  
   } tk h *su  
  } < Mu`,Kv*  
 } gdqBT]j  
 return bRemoved; kFmtE dhsc  
} )wD/<7;  
4J(-~  
L1g0Dd\Ox  
  DLL中的钩子函数如下: emrA!<w!W  
a.?U $F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T KAs@X,t  
{ , u%V%  
 BOOL bProcessed=FALSE; 8c9<kGm$E  
 if(HC_ACTION==nCode) @^ -Y&N!b=  
 { aTeW#:m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 <`; {gX1  
   switch(wParam) X9FO"(J  
   {  4L{]!dox  
    case VK_MENU: MY c&  
     MaskBits&=~ALTBIT; p19@to5l  
     break; F?H=2mzKbz  
    case VK_CONTROL: PO6yE r  
     MaskBits&=~CTRLBIT; {}Is&^3Z  
     break; \>lA2^E f  
    case VK_SHIFT: |_8l9rB5ip  
     MaskBits&=~SHIFTBIT; 0}`-vOLd-  
     break; ;A7JX:*?y=  
    default: //judge the key and send message ;i?2^xe^~c  
     break; } -;)G~h/"  
   } u SQ#Y^V_  
   for(int index=0;index<MAX_KEY;index++){ wik<# ke  
    if(hCallWnd[index]==NULL) 5n}<V-yJ*m  
     continue; )mBYW}} T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h\3-8m  
    { x`@`y7(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $HQ4o\~  
     bProcessed=TRUE; 2=8PA/  
    } UdnRsp9S  
   } 2/s42 FoG  
  } GCO: !,1  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?H@<8Ra=3  
   switch(wParam) GxG~J4  
   { R"P-+T=7M  
    case VK_MENU: QdQ1+*/+U  
     MaskBits|=ALTBIT; Z/?{{}H+  
     break; 0\ (:y^X  
    case VK_CONTROL: 4E=v)C'  
     MaskBits|=CTRLBIT; BYM6cp+S  
     break; {en'8kS  
    case VK_SHIFT: !Pnjr T  
     MaskBits|=SHIFTBIT; ; xp-MK  
     break; ^4"AWps  
    default: //judge the key and send message Q]N&^ E  
     break; =|IlORf<  
   } [{u3g4`}  
   for(int index=0;index<MAX_KEY;index++){ v7./u4S|V  
    if(hCallWnd[index]==NULL) LFHJj-nk  
     continue; =_ |G q|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ml1%C%  
    { |M5#jVXj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [yQ%g;m  
     bProcessed=TRUE; lbIPtu  
    } XJ3sqcS  
   } .|R4E  
  } N\|z{vn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ] T]{VB  
   for(int index=0;index<MAX_KEY;index++){ ^&1O:G*"  
    if(hCallWnd[index]==NULL) |H_WY#  
     continue; !vRZh('R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b-  t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eU%49 A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `DgK$QM  
   } X]@"ZV[  
  } R`a~8QVh&5  
 } Fl=H5HR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h^tCF=S  
} *1`X}  
TMPk)N1Ka  
  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: wT" :  
vFR *3$ R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |3,WiK='  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b}0h ()v  
jj]\]6@+P  
  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: UcQ]n0J=Z  
= N*Jis  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qD>^aEd@4  
{ ,k4pW&A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) >{Hg+/  
 { [ZSC]w^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 L>sLb(2\i  
  SaveBmp(); TxG@#" ^g}  
  return FALSE; sS}:Od  
 } zs#-E_^%M  
 …… //其它处理及默认处理 U; oXX  
} ]}rNxT4<  
raPOF6-_rH  
)x/#sW%)  
  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。 AtCT  
l6HtZ(  
  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。 08nh y[  
jC>ZMy8U)4  
  二、编程步骤 bOr11?  
 1}=D  
  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"; I8J>>H'#A  
-@w,tbc$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;`7~Q  
h76j|1gI  
  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; 9t\14tVwx  
u$aK19K/  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q ][kD2  
n&;JW6VQS  
  5、 添加代码,编译运行程序。 G=17]>U  
; D<k  
三、程序代码 cDz@3So.b  
n?r8ZDJ'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pwfQqPC#_  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }5vKQf   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4%r?(C0x  
#if _MSC_VER > 1000 vm+3!s:u  
#pragma once ' /HShS!d  
#endif // _MSC_VER > 1000 L1RD`qXu.  
#ifndef __AFXWIN_H__ WS n>P7sY  
#error include 'stdafx.h' before including this file for PCH 1i z =i^}  
#endif _9lMa 7i  
#include "resource.h" // main symbols ^\gb|LEnK  
class CHookApp : public CWinApp Cu#n5SF*  
{ ?{TWsuP7  
 public: \2y/:  
  CHookApp(); PM84Z@Y  
  // Overrides Jl\xE`-7  
  // ClassWizard generated virtual function overrides X2A k  
  //{{AFX_VIRTUAL(CHookApp) Fw&ImRMk  
 public: PdO"e  
  virtual BOOL InitInstance(); qA7,txQ:  
  virtual int ExitInstance(); L%v@|COQ3  
  //}}AFX_VIRTUAL GW>F:<p  
  //{{AFX_MSG(CHookApp) &qXobJRM  
  // NOTE - the ClassWizard will add and remove member functions here. O oA!N-Q  
  // DO NOT EDIT what you see in these blocks of generated code ! t!rrYBSCr  
  //}}AFX_MSG R&W%E%uj  
  DECLARE_MESSAGE_MAP() ZUHW*U.  
}; 2K>1,[C'Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Y[7prjd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _\+]/rY9o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g$GGo[_0  
BOOL InitHotkey(); ^oPFLez56  
BOOL UnInit(); h623)C;  
#endif 7(o`>7x*  
FA-cTF[,(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t jThQ  
#include "stdafx.h" *.nSv@F  
#include "hook.h" F?2UHcs  
#include <windowsx.h> *RS/`a;,  
#ifdef _DEBUG kB@gy}  
#define new DEBUG_NEW n[DRX5OxR'  
#undef THIS_FILE 6inAnC@I  
static char THIS_FILE[] = __FILE__; ?QffSSj[s  
#endif @* vVc`;  
#define MAX_KEY 100 4$VDJ  
#define CTRLBIT 0x04 9cB+ x`+Lu  
#define ALTBIT 0x02 vai w*?jV  
#define SHIFTBIT 0x01 (Nc~l ^a  
#pragma data_seg("shareddata") >6Uc|D  
HHOOK hHook =NULL; Ci-Ze j  
UINT nHookCount =0; 9+9g(6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7Q|<6210  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v*Gd=\88  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey E'4Psx9: =  
static int KeyCount =0; -B-G$ii  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^=^\=9" b  
#pragma data_seg() `oNJ=,p  
HINSTANCE hins; G 3U[)("  
void VerifyWindow(); O'(Us!aq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $)NS]wJ]3  
//{{AFX_MSG_MAP(CHookApp) !D['}%  
// NOTE - the ClassWizard will add and remove mapping macros here. 'A5T$JV.r4  
// DO NOT EDIT what you see in these blocks of generated code! d`rZgY  
//}}AFX_MSG_MAP }&/>v' G  
END_MESSAGE_MAP() nxhlTf>3  
:y7K3:d3  
CHookApp::CHookApp() P9 HKev?y  
{ M7?ktK9`ma  
 // TODO: add construction code here, mWZP.w^-  
 // Place all significant initialization in InitInstance 'i$. _Tx  
} BAXu\a-C_  
(/$-2.@  
CHookApp theApp; P^"RH&ZQJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '|=Pw  
{ ?WXftzdf6u  
 BOOL bProcessed=FALSE; )rP,+B?W  
 if(HC_ACTION==nCode) \azMF}mb  
 { D)x^?!  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^k7I+A  
   switch(wParam) h(yFr/  
   { hK)'dG*  
    case VK_MENU: BA1H)%  
     MaskBits&=~ALTBIT; L }{3_/t  
     break; pW.WJ`Rk  
    case VK_CONTROL: octQ[QXo#  
     MaskBits&=~CTRLBIT; W8bp3JX"  
     break; F8<G9#%s\  
    case VK_SHIFT: VsSAb%  
     MaskBits&=~SHIFTBIT; v#{Nh8n  
     break; U - OD  
    default: //judge the key and send message -V;Y4,:c  
     break; ox`Zs2-a  
   } ppn  8  
   for(int index=0;index<MAX_KEY;index++){ <QvVPE}z   
    if(hCallWnd[index]==NULL) RuYIG?J=/  
     continue; 67&IaDts  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I)1ih  
    { 6bUP]^d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D$4GNeB+#  
     bProcessed=TRUE; D~ 3@v+d  
    } 3 .#L  
   } *w0|`[P+h  
  } 5ZkR3/h e  
  else if((lParam&0xc000ffff)==1){ //Key down mZB:j]T  
   switch(wParam) i[9gcL"  
   {  m-4#s  
    case VK_MENU: )jl@ hnA  
     MaskBits|=ALTBIT; mD7NQ2:wA  
     break; C zw]5  
    case VK_CONTROL: .S|T{DMQ[  
     MaskBits|=CTRLBIT; ;taZixOH  
     break; nI?*[y}  
    case VK_SHIFT: 8K 9HFT@yV  
     MaskBits|=SHIFTBIT; r4[=pfe25  
     break; *:d ``L  
    default: //judge the key and send message BMO,eQcB  
     break; ):hz /vZ  
   } VtzZ1/J E  
   for(int index=0;index<MAX_KEY;index++) tH;9"z# ~  
   { 5P<1I7d  
    if(hCallWnd[index]==NULL) l-W)? d  
     continue; pSC{0Y$g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gi-pi=#&cs  
    { p*jU)@a0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2|\mBP`ok  
     bProcessed=TRUE; JdI*@b2k[  
    } !NNPg?Y  
   } Tx&H1  
  } YIW9z{rrs  
  if(!bProcessed){ <H] PP6_g:  
   for(int index=0;index<MAX_KEY;index++){ ha|2u(4  
    if(hCallWnd[index]==NULL) X~m57 b j  
     continue; :CM-I_6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9$v\D3<Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *-]k([wV  
   } i| cA)  
  } = .S2gO >  
 } 2u_=i$xW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gYbvCs8O!  
} _5n2'\] H`  
FEhBhv|m  
BOOL InitHotkey() rMWvW(@@D  
{ o/,%rA4  
 if(hHook!=NULL){ 74 ptd,  
  nHookCount++; ,e$RvFB  
  return TRUE; < hy!B4  
 } 8bMw.u=F  
 else m8L %!6o  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \4$Nx/@Q}  
  if(hHook!=NULL) ?~.9: 93  
   nHookCount++; l]DRJ  
  return (hHook!=NULL); oIOeX1$V  
} B> i^w1  
BOOL UnInit() N%:uOX8{  
{ 7.NL>:lu  
 if(nHookCount>1){ JYjc^m  
  nHookCount--; 1*9Yy~w  
  return TRUE; `4@` G:6BL  
 } :, H_ e! X  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .Sw4{m[g  
 if(unhooked==TRUE){ </<z7V,{  
  nHookCount=0; n@@tO#!\  
  hHook=NULL; tZ=|1lM  
 } ^{yb4yQ 0  
 return unhooked; P/~dY  
} 5r8 [ "  
G2[2y-Rv  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0j;|IU\  
{ HWoMzp5="3  
 BOOL bAdded=FALSE; &flcJ`  
 for(int index=0;index<MAX_KEY;index++){ ~O./A-l  
  if(hCallWnd[index]==0){ M[b~5L+S  
   hCallWnd[index]=hWnd; $aXYtHI  
   HotKey[index]=cKey; .Z QXY%g  
   HotKeyMask[index]=cMask; FhH*lO&  
   bAdded=TRUE; cQh{z8Bf?<  
   KeyCount++; 3H"F~_H  
   break; p(4Ek"  
  } G@ybx[_[@  
 } +A,cdi9z  
 return bAdded; z&GGa`T"  
} mNe908Yw  
BI#(L={5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?b^<Tny  
{ 2 (ux  
 BOOL bRemoved=FALSE; )CL/%I,^  
 for(int index=0;index<MAX_KEY;index++){ 35-FD{  
  if(hCallWnd[index]==hWnd){ *Z"Kvj;>u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /Jk.b/t.*S  
    hCallWnd[index]=NULL; %iV\nFal>  
    HotKey[index]=0; $\4Or  
    HotKeyMask[index]=0; c$A}mL_  
    bRemoved=TRUE; ,,9vk\  
    KeyCount--; ,aWfGh#$  
    break; nYRD>S?uz  
   } <N 80MU L|  
  } g5Hsz,x  
 } I GcR5/3  
 return bRemoved; S9/\L6Rmf  
} DML0paOm5  
S!}pL8OE  
void VerifyWindow() T?__  
{ ~;I{d7z,;  
 for(int i=0;i<MAX_KEY;i++){ mOjl0n[To]  
  if(hCallWnd!=NULL){ i3Nt?FSN  
   if(!IsWindow(hCallWnd)){ +xmZK<{<  
    hCallWnd=NULL; t.O4-+$ig  
    HotKey=0; /s:akLBaD  
    HotKeyMask=0; >273V+dy  
    KeyCount--; g ]}] /\  
   } 1^;&?E  
  } 8{Svax(  
 } I#p-P)Q%S  
} )./'RE+(k  
A,ao2)  
BOOL CHookApp::InitInstance() Q([g1?F9*  
{ v#IZSBvuQK  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |4Q><6"G  
 hins=AfxGetInstanceHandle(); ',RR*{I  
 InitHotkey(); +n`^W(  
 return CWinApp::InitInstance(); yFP#z5G  
} 'Uo:b<  
P#Ikj& l   
int CHookApp::ExitInstance() s3T 6"%S`  
{ \@n/L{}(@  
 VerifyWindow(); |@)ij c4i  
 UnInit(); bL7mlh  
 return CWinApp::ExitInstance(); !C0= h  
} b}q,cm  
]zK} X!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file aR;Q^YJ+a  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?at~il$z'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PsD]gN5"  
#if _MSC_VER > 1000 sAc)X!}  
#pragma once X]CaWxM  
#endif // _MSC_VER > 1000 d}415 XA  
 *JOv  
class CCaptureDlg : public CDialog q`;URkjk  
{ 4]8PF  
 // Construction z#*GPA8Em:  
 public: kQBVx8Uq]  
  BOOL bTray; <~8W>Y\m  
  BOOL bRegistered; tv|=`~Y  
  BOOL RegisterHotkey(); )ZmE"  
  UCHAR cKey; +V\NMW4d  
  UCHAR cMask; )'<zC  
  void DeleteIcon(); bm7$DKp#  
  void AddIcon(); r*3XM{bZ/@  
  UINT nCount; 'XQv>J  
  void SaveBmp(); A><%"9pZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +Q_Gm3^  
  // Dialog Data  L_Ai/'  
  //{{AFX_DATA(CCaptureDlg) Ri-wbYFaP  
  enum { IDD = IDD_CAPTURE_DIALOG }; aA yFu_  
  CComboBox m_Key; ->#7_W  
  BOOL m_bControl; @o^sp|k !  
  BOOL m_bAlt; Vgm{=$  
  BOOL m_bShift; B'0Il"g'  
  CString m_Path; ,>jm|BTD {  
  CString m_Number; (}qLxZ/U  
  //}}AFX_DATA q{JD]A:  
  // ClassWizard generated virtual function overrides ZyWC_r!  
  //{{AFX_VIRTUAL(CCaptureDlg) O 1X !  
 public: ZmHl~MR@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |$0/:*  
 protected: SI(8.$1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )*JTxMQ  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;~q)^.K3  
  //}}AFX_VIRTUAL ?x/ L"h&Kp  
  // Implementation ]ogy`O>  
 protected: F^~#D, \  
  HICON m_hIcon; E|Lh$9XONA  
  // Generated message map functions n*xNMw1x"T  
  //{{AFX_MSG(CCaptureDlg) aY+>85?g  
  virtual BOOL OnInitDialog(); LtvyWc`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &]c9}Ic  
  afx_msg void OnPaint(); dCyQCA[  
  afx_msg HCURSOR OnQueryDragIcon(); *:_hOOT+[  
  virtual void OnCancel(); }w@nZG ^&  
  afx_msg void OnAbout(); nb!m>0*/  
  afx_msg void OnBrowse(); CUd'*Ewu  
  afx_msg void OnChange(); 5LK>n-  
 //}}AFX_MSG K^vMIoh  
 DECLARE_MESSAGE_MAP() z'I0UB#  
}; NV;tsuA|  
#endif \^:f4ZT  
Te13Af~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gy[uq m_ T  
#include "stdafx.h" \ a<Ye T  
#include "Capture.h" ?d%}K76V<  
#include "CaptureDlg.h" ixkg,  
#include <windowsx.h> 0nd<6S+fs  
#pragma comment(lib,"hook.lib") MLb\:Ihy  
#ifdef _DEBUG G j:|  
#define new DEBUG_NEW u@3w$"Pv1  
#undef THIS_FILE [6tQv<}^  
static char THIS_FILE[] = __FILE__; @'y"D  
#endif $7*Ml)H!9  
#define IDM_SHELL WM_USER+1 vtT:c.~d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); & Gt9a-ne  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +Snjb0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :4Vt  
class CAboutDlg : public CDialog g<-cHF  
{ }A;Xd/,'r  
 public: 33 4*nQ  
  CAboutDlg(); /L 4WWQ5  
  // Dialog Data "8X+F%  
  //{{AFX_DATA(CAboutDlg) ij),DbWd  
  enum { IDD = IDD_ABOUTBOX }; G#*;3X$  
  //}}AFX_DATA 6bn-NY:i  
  // ClassWizard generated virtual function overrides b +_E)4  
  //{{AFX_VIRTUAL(CAboutDlg) }1P  
 protected: yC5|"+ A$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4c yv 8  
  //}}AFX_VIRTUAL *%e#)sn*  
  // Implementation Bk F[nL*|  
 protected: G~Sfpf  
  //{{AFX_MSG(CAboutDlg) re*/JkDq3K  
  //}}AFX_MSG V]2z5u_q  
  DECLARE_MESSAGE_MAP() A!~o?ej  
}; ^pP 14y*go  
gs3}rW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) A.FI] K@  
{ o5R\7}]GE  
 //{{AFX_DATA_INIT(CAboutDlg) 6M9rC[h\  
 //}}AFX_DATA_INIT H6eGLg={  
} #Grm-W9E  
 ]gW J,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S7vE[VF5  
{ one>vi`=  
 CDialog::DoDataExchange(pDX); GwULtRa/  
 //{{AFX_DATA_MAP(CAboutDlg) -iHhpD9"X  
 //}}AFX_DATA_MAP T_-MSXhA  
} KPhqD5, (  
*GhRU5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) BTyVfq sx  
 //{{AFX_MSG_MAP(CAboutDlg) `<n:D`{dZ  
 // No message handlers `dZ|}4[1  
 //}}AFX_MSG_MAP DPOPRi~  
END_MESSAGE_MAP() Ah`dt8t  
4@I]PG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EUkNh>U?  
: CDialog(CCaptureDlg::IDD, pParent) =)8Ct  
{ 68*{Lo?U  
 //{{AFX_DATA_INIT(CCaptureDlg) |*5nr5c_L  
  m_bControl = FALSE; 4#w^PM8}  
  m_bAlt = FALSE; qu%s 7+  
  m_bShift = FALSE; / ["T#`  
  m_Path = _T("c:\\"); ^d*>P|n*@e  
  m_Number = _T("0 picture captured."); a5M>1&j/eC  
  nCount=0; <GN?J.B  
  bRegistered=FALSE; De_</1Au!2  
  bTray=FALSE; as4NvZ@+r  
 //}}AFX_DATA_INIT F?kVW[h?q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @El<"\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *@nUas 2"  
} ?s]`G'=>V`  
JPG!cX%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4/?Zp4g  
{ fna>>  
 CDialog::DoDataExchange(pDX); ]Yex#K   
 //{{AFX_DATA_MAP(CCaptureDlg) ihrrmlN?  
  DDX_Control(pDX, IDC_KEY, m_Key); B(LV22#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); val<N293L>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (T01hR&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j+hoj2(  
  DDX_Text(pDX, IDC_PATH, m_Path); b*KZe[#M1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); W\7*T1TDj  
 //}}AFX_DATA_MAP v_0!uT5~NE  
} ay4xOwcR  
k Dt)S$N4n  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {@Ac L:Eit  
//{{AFX_MSG_MAP(CCaptureDlg) o=QF>\ \  
 ON_WM_SYSCOMMAND() *lAdS]I  
 ON_WM_PAINT() <*(R+to^d  
 ON_WM_QUERYDRAGICON() @ `D6F;R  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [B`P]}gL:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;G]'}$`/q  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :\_MA^<  
//}}AFX_MSG_MAP F.D1;,x  
END_MESSAGE_MAP() c^IEj1@}'?  
(qN(#~  
BOOL CCaptureDlg::OnInitDialog() GcW}<g}  
{ bf/loMtD  
 CDialog::OnInitDialog(); !++62Lf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8zWPb  
 ASSERT(IDM_ABOUTBOX < 0xF000); [Gy'0P(EQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); V?BVk8D};  
 if (pSysMenu != NULL) ^;Q pE  
 { H~]o]uAi"  
  CString strAboutMenu; qhtAtP>i"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {W<-f?  
  if (!strAboutMenu.IsEmpty()) _ZBR<{  
  { D:tZiS=0  
   pSysMenu->AppendMenu(MF_SEPARATOR); o q)"1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); V&v~kzLr+  
  } T(^8ki  
 } gq3OCA!cX  
 SetIcon(m_hIcon, TRUE); // Set big icon GuvF   
 SetIcon(m_hIcon, FALSE); // Set small icon >:&p(eu)L0  
 m_Key.SetCurSel(0); e622{dfVS  
 RegisterHotkey(); v^fOT5\  
 CMenu* pMenu=GetSystemMenu(FALSE); lG>e6[Wc  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^\jX5)2{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b] ?;R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4CT9-2UC  
 return TRUE; // return TRUE unless you set the focus to a control z,YUguc|  
} S=SncMO nE  
Cpv%s 1M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $4JX#lkt  
{ }tO<_f))  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) PM!t"[@&  
 { $i~`vu*  
  CAboutDlg dlgAbout; y/hvH"f  
  dlgAbout.DoModal(); :~R Fy?xRa  
 } i!x5T%x_  
 else @|%ICG c  
 { eh4"_t  
  CDialog::OnSysCommand(nID, lParam); S@NhEc  
 } 3MJWCo-[  
} 9= $,]M  
O \8G~V 5"  
void CCaptureDlg::OnPaint() Ia:puks=  
{ mIEaWE;E"  
 if (IsIconic()) 9R"N#w.U]  
 { ik0Q^^1?Y  
  CPaintDC dc(this); // device context for painting n4T2'e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p+UHJ&  
  // Center icon in client rectangle <JM%Kn )  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^Jl!WH=20}  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4~YQ\4h=  
  CRect rect; Prz +kPP  
  GetClientRect(&rect); :k(t/*Nl3  
  int x = (rect.Width() - cxIcon + 1) / 2; E/$@ud|l"  
  int y = (rect.Height() - cyIcon + 1) / 2; LE80`t>M#  
  // Draw the icon *1S.9L  
  dc.DrawIcon(x, y, m_hIcon); *N e2l`!1m  
 } }SN44 di(  
 else Z)T@`B6  
 { ?V:]u 3  
  CDialog::OnPaint(); `+Z#*lj|@  
 } bK$D lBZ  
} rRrW   
mW0&uSM D  
HCURSOR CCaptureDlg::OnQueryDragIcon() ieRBD6_  
{ G:C6`uiy`  
 return (HCURSOR) m_hIcon; 8kM0  
} <ZC^H  
'# IuY  
void CCaptureDlg::OnCancel() !XA%[u  
{ !2U7gVt"*  
 if(bTray) as |c`4r\O  
  DeleteIcon(); ;6 6_G Sjz  
  CDialog::OnCancel(); }rA+W-7  
} mYOdBd  
)LrCoI =|  
void CCaptureDlg::OnAbout() ( WtE`f;Q  
{ +\[![r^P  
 CAboutDlg dlg; S]%U]  
 dlg.DoModal(); sa(M66KkU  
} -WBz]GW4r  
o7a6 )2JK  
void CCaptureDlg::OnBrowse() +IO1ipc4cE  
{ <Dj$0g  
 CString str; +6M+hO]  
 BROWSEINFO bi; 0H&U=9'YT  
 char name[MAX_PATH]; ji)4WG/1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2DC cGKa"  
 bi.hwndOwner=GetSafeHwnd(); o- QG& ]  
 bi.pszDisplayName=name; K!D!b'|bb  
 bi.lpszTitle="Select folder"; Pzm!`F^r}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K9O,7h:x  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); FDd>(!>  
 if(idl==NULL) E<#4G9O<  
  return; ZR-s{2sl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); CBnouKc:  
 str.ReleaseBuffer(); .Lr)~  
 m_Path=str; ~eV!!38 J  
 if(str.GetAt(str.GetLength()-1)!='\\') CNRU"I+jU  
  m_Path+="\\"; cYWy\+  
 UpdateData(FALSE); OQL09u  
} b~Pxgfu"  
Y^ZBA\D2,k  
void CCaptureDlg::SaveBmp() ['4\O43yv  
{ fzFvfMAU  
 CDC dc; R4~zL!7;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); HMS9y%zl/  
 CBitmap bm; Z(k\J|&9C  
 int Width=GetSystemMetrics(SM_CXSCREEN); jle%|8m&@  
 int Height=GetSystemMetrics(SM_CYSCREEN); E4v_2Q -w  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #u<o EDQ  
 CDC tdc; 51ajE2+X&  
 tdc.CreateCompatibleDC(&dc); HLoQ}oK|K  
 CBitmap*pOld=tdc.SelectObject(&bm); l@Eq|y,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q(;B)  
 tdc.SelectObject(pOld); Oz#EGjz  
 BITMAP btm; 78a-3){  
 bm.GetBitmap(&btm); VmOFX:j!,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; bDFCZH-:'O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (&P0la 1  
 BITMAPINFOHEADER bih; gR-Qj  
 bih.biBitCount=btm.bmBitsPixel; qv0 DrL,3  
 bih.biClrImportant=0; 'Elj"Iiu  
 bih.biClrUsed=0; o ,Tr^e$  
 bih.biCompression=0; )_c=mT  
 bih.biHeight=btm.bmHeight; EB29vHAt~  
 bih.biPlanes=1; dp[w?AMhM9  
 bih.biSize=sizeof(BITMAPINFOHEADER); B/sBYVU  
 bih.biSizeImage=size; [*?_  
 bih.biWidth=btm.bmWidth; }@:QYTBi }  
 bih.biXPelsPerMeter=0; O{B e )E~  
 bih.biYPelsPerMeter=0; H ?`)[#  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +F7<5YW&(  
 static int filecount=0; 3?*M{Y|  
 CString name; s*)41\V0  
 name.Format("pict%04d.bmp",filecount++); xf^<ec  
 name=m_Path+name; )p!*c,  
 BITMAPFILEHEADER bfh; \Sw+]pr~  
 bfh.bfReserved1=bfh.bfReserved2=0; yK&* ,J |  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ANFg]g.Az  
 bfh.bfSize=54+size; .?i-rTF:  
 bfh.bfOffBits=54; {n'qKur xY  
 CFile bf; n(Q\' ,C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sR>`QIi(a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m,@1LwBH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F[7Kw"~J  
  bf.WriteHuge(lpData,size); d@D;'2}Yc  
  bf.Close(); X@yr$3vC  
  nCount++; ;X$q#qzN#  
 } o/dMm:TF  
 GlobalFreePtr(lpData); W) 33;E/}  
 if(nCount==1) K{ zCp6  
  m_Number.Format("%d picture captured.",nCount); |YE,) kiF  
 else ,XeyE;||  
  m_Number.Format("%d pictures captured.",nCount); U50s!Z t45  
  UpdateData(FALSE); iBKb/Oi6  
} 0E?s>-b  
62MRI    
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WG8iTVwx  
{ y7M:b Uh  
 if(pMsg -> message == WM_KEYDOWN) ?y>Y$-v/C  
 { @3 -,=x  
  if(pMsg -> wParam == VK_ESCAPE) a)_rka1(  
   return TRUE; $*AC>i\  
  if(pMsg -> wParam == VK_RETURN) ,W1a<dl  
   return TRUE; {*?sVAvj  
 } y^mWG1"O  
 return CDialog::PreTranslateMessage(pMsg); b(}Gm@#  
} N ;Z`%&  
*?^Z)C>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Sg.+`xww3  
{ }x kLD!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?~aZ#%*i8  
  SaveBmp(); $Wr\ [P:  
  return FALSE; tLD~  
} *t#s$Ga  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A$%Q4jC}  
 CMenu pop; >Lw}KO`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); UTDcX  
 CMenu*pMenu=pop.GetSubMenu(0); 5!'R'x5e  
 pMenu->SetDefaultItem(ID_EXITICON); HDF!`  
 CPoint pt; o%Be0~n'  
 GetCursorPos(&pt); AezvBY0'`z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); J+)'-OFt0  
 if(id==ID_EXITICON) MvFM ,  
  DeleteIcon(); J$#h( D%  
 else if(id==ID_EXIT) &jV9*  
  OnCancel(); ?~"`^|d  
 return FALSE; ^w:OS5%R  
} 0W T#6D  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5:Yck<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) c Ndw9?Z  
 AddIcon(); .7 (DxN  
 return res; V&Xi> X8  
} y4xT:G/M  
E /fw?7eQ  
void CCaptureDlg::AddIcon() DR k]{^C~  
{ -A/ds1=;  
 NOTIFYICONDATA data; K<@[_W+  
 data.cbSize=sizeof(NOTIFYICONDATA); zVM4BT(  
 CString tip; le7 `uz!%  
 tip.LoadString(IDS_ICONTIP); ?xtt7*'D  
 data.hIcon=GetIcon(0); a'@-"qk  
 data.hWnd=GetSafeHwnd(); $uEJn&n7}  
 strcpy(data.szTip,tip); Xw7{R  
 data.uCallbackMessage=IDM_SHELL; PUbaS{J7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ''#p47$8<d  
 data.uID=98; ?mH@`c,fM  
 Shell_NotifyIcon(NIM_ADD,&data); ],;D2]<s  
 ShowWindow(SW_HIDE); 5/& 1Oxo  
 bTray=TRUE; `%-4>jI9-  
} X^zYQ6t  
g3|BE2?  
void CCaptureDlg::DeleteIcon() v~ ^ks{  
{ 33Ssylno  
 NOTIFYICONDATA data; #/ OUGeJ  
 data.cbSize=sizeof(NOTIFYICONDATA); |h5kg<Zgo  
 data.hWnd=GetSafeHwnd(); I3Lg?bZ  
 data.uID=98; %mY|  
 Shell_NotifyIcon(NIM_DELETE,&data); CJzm}'NY  
 ShowWindow(SW_SHOW); s~S?D{!  
 SetForegroundWindow(); NTqo`VWe  
 ShowWindow(SW_SHOWNORMAL); [f<"p[  
 bTray=FALSE; q1YLq(e  
} oi7 3YOB  
c]A Y  
void CCaptureDlg::OnChange() M'yO+bu  
{ blJIto '  
 RegisterHotkey(); MV%Xhfk  
} )-=2w-ZX  
mJ)tHv"7  
BOOL CCaptureDlg::RegisterHotkey() TE3*ktB{N  
{ }qer   
 UpdateData(); rmOQ{2}  
 UCHAR mask=0; h^}_YaT\  
 UCHAR key=0; l iw,O 6  
 if(m_bControl) Pj'62[5z  
  mask|=4; 's)fO#  
 if(m_bAlt) +'-rTi\  
  mask|=2; bfFmTI$,  
 if(m_bShift) 31WZJm^  
  mask|=1; $Axng J c  
  key=Key_Table[m_Key.GetCurSel()]; {tPnj_|n<  
 if(bRegistered){ m"n.Dz/S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \CcmePTN#x  
  bRegistered=FALSE; (nGkZ}p  
 } F[5S(7M 7  
 cMask=mask; HtxLMzgz<<  
 cKey=key; br b[})}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ya:sW5fk  
 return bRegistered; YU&4yk lE  
} f2NA=%\  
vCj4;P g  
  四、小结 aSUsyOe  
4<u;a46Z#M  
  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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