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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: DQhHU1  
  m@nGXl'!  
  一、实现方法  fp||<B  
RPa]VL1W  
  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: M}jl \{  
_$*-?*V&  
#pragma data_seg("shareddata") 'tTlBf7#  
HHOOK hHook =NULL; //钩子句柄 cV:Q(|QC  
UINT nHookCount =0; //挂接的程序数目 +PYR  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 p3fV w]N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x75;-q  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3=]/+{B  
static int KeyCount =0; <=uO*s>%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ruqE]Hx9(  
#pragma data_seg() e~QLzZ3  
j 1'H|4  
  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。 NHZMH!=4:n  
%/zHL?RqJ  
  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: z*nztvY@e  
;\"Nekd|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR yzpa\[^  
cKey,UCHAR cMask) 3>(~5  
{ N+SA$wG  
 BOOL bAdded=FALSE; [9?]|4  
 for(int index=0;index<MAX_KEY;index++){ !5+9~/;  
  if(hCallWnd[index]==0){ PvUY Q>Kw  
   hCallWnd[index]=hWnd; ,hK =x  
   HotKey[index]=cKey; w}}+8mk[  
   HotKeyMask[index]=cMask; IAd ^$9  
   bAdded=TRUE; .*k!Zl*  
   KeyCount++; MS SHMR  
   break; Qvny$sr2  
  } <\:*cET3  
 } ve#[LBOC8  
 return bAdded; dd=5`Bo9Yh  
} rGH7S!\AM  
//删除热键 3I?yRE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0wBr_b!  
{ ;Xidv9c  
 BOOL bRemoved=FALSE; JmF`5  
 for(int index=0;index<MAX_KEY;index++){ J!rZs kd  
  if(hCallWnd[index]==hWnd){ @TKQ_7BcB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7({.kD6  
    hCallWnd[index]=NULL; =L$RY2S"  
    HotKey[index]=0; ^(xVjsHp#  
    HotKeyMask[index]=0; 7.5\LTM>9e  
    bRemoved=TRUE; 17Q* <iCs  
    KeyCount--; W6B o\UK  
    break; !/&~Feb  
   } x2i`$iNhmP  
  } I |D]NY^  
 } a(o[ bH.|;  
 return bRemoved; 7Ph+Vs+h  
} `Geq,  
0@f7`D  
,Ur~DXY  
  DLL中的钩子函数如下: B7ys`eiB5C  
'\m\$ {  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GLl@ 6S>v  
{ ZG)C#I1;O  
 BOOL bProcessed=FALSE; -JF|770i  
 if(HC_ACTION==nCode) \No22Je6d  
 { A[d'*n[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ] )x z  
   switch(wParam) Iq": U  
   {  6a`_i  
    case VK_MENU: uP ?gGo  
     MaskBits&=~ALTBIT; [/t/694  
     break; qpc2;3*7  
    case VK_CONTROL: S4~;bsSx  
     MaskBits&=~CTRLBIT; tX *L_  
     break; CtDS lJ  
    case VK_SHIFT: PzTTL=G +  
     MaskBits&=~SHIFTBIT; dR /UXzrc  
     break; w_J`29uc  
    default: //judge the key and send message >BQF<  
     break; 4sK|l|W  
   } TA Yt:  
   for(int index=0;index<MAX_KEY;index++){ DPtyCgH  
    if(hCallWnd[index]==NULL) b_Ky@kp  
     continue; s?K4::@Fv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .Lu=16  
    { 5p{tt;9[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s: q15"  
     bProcessed=TRUE; $t </{]iX  
    } qXW2a'~  
   } B 9]sSx  
  } !r!Mq~X<=  
  else if((lParam&0xc000ffff)==1){ //有键按下 7!N5uR  
   switch(wParam) uJp}9B60_  
   { g9"_BG  
    case VK_MENU: <F.Ol/'h  
     MaskBits|=ALTBIT; 7#|NQ=yd  
     break; Sdt2D  
    case VK_CONTROL: &akMj@4;R  
     MaskBits|=CTRLBIT; s9:2aLZ {  
     break; f&cG;Y  
    case VK_SHIFT: 3yD5u  
     MaskBits|=SHIFTBIT; 2Nl("e^kJr  
     break; yb**|[By  
    default: //judge the key and send message d`nS0Tf'  
     break; r@<;  
   } +#H8d1^5  
   for(int index=0;index<MAX_KEY;index++){ B 9Mwj:)}  
    if(hCallWnd[index]==NULL) 3S2'JOTY  
     continue; i+cGw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +[ }]a3)  
    { /~tfP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zB]T5]  
     bProcessed=TRUE; ;<X3AhF  
    } R +JI ?/H  
   } x?<5=,  
  } j1iC1=`ZM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Q6W)rJ[|  
   for(int index=0;index<MAX_KEY;index++){ D3lYy>~d5;  
    if(hCallWnd[index]==NULL) 80]TKf>  
     continue; ];2eIe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rqh,BkQ0t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QBn>@jq  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 &{=~)>h  
   } Tk2kis(n  
  } m[7:p{  
 } Zz&i0 r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &s;%(c04A  
} mVL,J=2  
< 5_Ys  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 9FLn7Y  
uN(~JPAw5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v!U#C[a^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |8`;55G  
TgB;R5  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: r;T/  
QF;<%QF:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NU(/Yit  
{ Y-c~"#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )Z%+~n3o'  
 { xA5$!Oq7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hCvn(f  
  SaveBmp(); W=\dsdnu*  
  return FALSE; _TXV{<E6  
 } .M{[J]H`t  
 …… //其它处理及默认处理 .XB] X  
} l=]vC +mU  
udZ: OU<  
hw'2q9J|  
  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。 E$>e< T  
{G0)mp,  
  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。 bgK(l d`  
rpT<cCem1  
  二、编程步骤 >oNk(. %  
Z%{f[|h9}  
  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"; '> Q$5R1  
U44H/5/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; +=k|(8Js#  
*vO'Z &  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; oX4uRc7wR  
e,*[5xQ  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ;2|H6IN"  
19u? ^w  
  5、 添加代码,编译运行程序。 Aii[=x8  
Xh/av[Q  
三、程序代码 ,6S 8s  
feW9 >f;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL E\S&} K,s  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `j![  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ r?I(me,  
#if _MSC_VER > 1000 nu<!/O  
#pragma once tp^'W7E  
#endif // _MSC_VER > 1000 U}0/V c26  
#ifndef __AFXWIN_H__ a&hM:n4P  
#error include 'stdafx.h' before including this file for PCH JrAc]=  
#endif @#tSx  
#include "resource.h" // main symbols 9.=#4OH/  
class CHookApp : public CWinApp 8W>l(w9M  
{ (B-9M)  
 public: 5w1[KO#K|  
  CHookApp(); X8x>oV;8  
  // Overrides ~\G3 l,4  
  // ClassWizard generated virtual function overrides sD3|Qj;  
  //{{AFX_VIRTUAL(CHookApp) 8!SiTOzR?  
 public: __iyBaX  
  virtual BOOL InitInstance(); pb Ie)nK  
  virtual int ExitInstance(); o?FUVK  
  //}}AFX_VIRTUAL @GtZK  
  //{{AFX_MSG(CHookApp) (d#Z-w-  
  // NOTE - the ClassWizard will add and remove member functions here. vNSf:5H$  
  // DO NOT EDIT what you see in these blocks of generated code ! TMCA?r%Y\  
  //}}AFX_MSG w0Y%}7  
  DECLARE_MESSAGE_MAP() RWo B7{G  
}; !S-U8KI|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [ d7]&i}*|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <pUou  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c7IR06E  
BOOL InitHotkey(); |u;PU`^-z  
BOOL UnInit(); }2,#[m M  
#endif 6S[D"Q94  
PWu2;JF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *KH@u  
#include "stdafx.h" eBIR *TZ):  
#include "hook.h" "%t`I)  
#include <windowsx.h> r_E)HL/A  
#ifdef _DEBUG Q$L(fH kw  
#define new DEBUG_NEW 8Jj0-4]  
#undef THIS_FILE np^<HfYV  
static char THIS_FILE[] = __FILE__; p'k+0=  
#endif  7~nCK  
#define MAX_KEY 100 ONiI:Z>%  
#define CTRLBIT 0x04 z44~5J]  
#define ALTBIT 0x02 o~&!M_ED  
#define SHIFTBIT 0x01 3&fFIab9  
#pragma data_seg("shareddata") Jk`)`94 I  
HHOOK hHook =NULL; ok2~B._+;  
UINT nHookCount =0; 2] G$6H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m@u`$rOh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT E_1I|$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A]%t0>EL<  
static int KeyCount =0; arKmc@"X  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift S)@vl^3ec  
#pragma data_seg() >o#wP  
HINSTANCE hins; 'a^tL[rLP1  
void VerifyWindow(); >wO$Vu `t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]G PJ(+5  
//{{AFX_MSG_MAP(CHookApp) otD?J= B  
// NOTE - the ClassWizard will add and remove mapping macros here. *yq]  
// DO NOT EDIT what you see in these blocks of generated code! zn1Rou]6  
//}}AFX_MSG_MAP ~C7<a48x  
END_MESSAGE_MAP() ;OU>AnWr(&  
UH-uU~  
CHookApp::CHookApp() {FY[|:Cp  
{ t`ceVS  
 // TODO: add construction code here, "ak9LZQ9z  
 // Place all significant initialization in InitInstance 5qkuK F  
} lV6[d8P  
R 0HVLQI  
CHookApp theApp; X/K)kIi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'Sy *'&  
{ -Dxhq& }Y  
 BOOL bProcessed=FALSE; I''R\B p  
 if(HC_ACTION==nCode) A{x 7  
 { 2qMsa>~  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z WRRh^  
   switch(wParam) bH&)rn  
   { bTQa'y`3  
    case VK_MENU: g+ 1=5g  
     MaskBits&=~ALTBIT; /:{_|P\  
     break; ~uR6z//%  
    case VK_CONTROL: n,a5LR  
     MaskBits&=~CTRLBIT; EvqAi/(g  
     break; |EV\a[  
    case VK_SHIFT: !FO^:V<|5  
     MaskBits&=~SHIFTBIT; #lshN,CPm  
     break; 6mpg&'>  
    default: //judge the key and send message oXlxPN39  
     break; _ c ]3nzIr  
   } fCf#zV[  
   for(int index=0;index<MAX_KEY;index++){ (S)E|;f%C  
    if(hCallWnd[index]==NULL) A :bPIXb  
     continue; .n& Cq+U;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A9l})_~i  
    { ~/jxB)t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v;]I^Kq  
     bProcessed=TRUE;  /E{dM2  
    } 4[,B;7  
   } 3R%UPT0>  
  } "G9'm  
  else if((lParam&0xc000ffff)==1){ //Key down ) Zb`~w  
   switch(wParam) `o8{qU,*]N  
   { =6Sj}/   
    case VK_MENU: n~)HfY  
     MaskBits|=ALTBIT; rH&r6Xv[  
     break; cP@F #!2  
    case VK_CONTROL: PL9eUy  
     MaskBits|=CTRLBIT; >[H&k8\7n  
     break; n^pZXb;Y  
    case VK_SHIFT: u2-@?yt  
     MaskBits|=SHIFTBIT; nz(q)"A  
     break; leES YSY:  
    default: //judge the key and send message ke9QT#~p!-  
     break; ;j>Vt?:Pw  
   } v=.z|QD^1  
   for(int index=0;index<MAX_KEY;index++) grCO-S|j^  
   { (!VMnLlXRK  
    if(hCallWnd[index]==NULL) _@/C~  
     continue; _h1 HuL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O/Y\ps3r  
    { C?60`^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +eBMn(7Cgv  
     bProcessed=TRUE; YF! &*6m  
    } JU'WiR bcb  
   } lQdnL.w$.4  
  } :Dk@?o@2;C  
  if(!bProcessed){ r!.+XrYg  
   for(int index=0;index<MAX_KEY;index++){ i,'Ka[6   
    if(hCallWnd[index]==NULL) OS"{"P  
     continue; ^s2m\Q(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _[TH@fO6:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z[k#AgC)  
   } [EmOA.6  
  } j(%gMVu  
 } 'z-;*!A}j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lP@)   
} (~ ]g,*+  
xA&  
BOOL InitHotkey() pG!(6V-x<E  
{ nrTv=*tDj  
 if(hHook!=NULL){ h eE'S/  
  nHookCount++; WjY{rM,K  
  return TRUE; MjQ[^%lfL  
 } N4a`8dS|  
 else Z#4JA/c!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r*6"'W>c6  
  if(hHook!=NULL) % QPWw~}:  
   nHookCount++; BEXQTM3])I  
  return (hHook!=NULL); `!nJS|  
} 9U|<q  
BOOL UnInit() y8w0eq94  
{ Bn~\HW\Lh  
 if(nHookCount>1){  's>#8;X  
  nHookCount--; DHm[8 Qp  
  return TRUE; YgfSC}a  
 } ~*7O(8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -yC:?  
 if(unhooked==TRUE){ ?{ B[^  
  nHookCount=0; |jahpji6  
  hHook=NULL; Xr?>uqY!M  
 } ='dLsh4P2N  
 return unhooked; 3:[!t%Yb  
} cxXbo a  
(px*R~}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sc&)~h}YF  
{ 1z~k1usRK  
 BOOL bAdded=FALSE; =5y`(0 I`U  
 for(int index=0;index<MAX_KEY;index++){ jDlA<1  
  if(hCallWnd[index]==0){ G;(onJz  
   hCallWnd[index]=hWnd; y$IaXr5L  
   HotKey[index]=cKey; (O8,zqP9l  
   HotKeyMask[index]=cMask; 3yTQ  
   bAdded=TRUE; @72x`&|I?u  
   KeyCount++; 6IEUJ-M Z  
   break; ycgfZ 3K  
  } ug^om{e-  
 } `OKo=e~,  
 return bAdded; ==]Z \jk  
} wVgi+P  
?. zu2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bK3B3r#$  
{  9t{|_G  
 BOOL bRemoved=FALSE; 0jR){G9+  
 for(int index=0;index<MAX_KEY;index++){ T>#TDMU#Fm  
  if(hCallWnd[index]==hWnd){ Y 3o^Euou  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +w "XNl  
    hCallWnd[index]=NULL; {]&R8?%  
    HotKey[index]=0; 2Sge  
    HotKeyMask[index]=0; pO"m~mpA  
    bRemoved=TRUE; R{*_1cyW  
    KeyCount--; DVObrL)znL  
    break; [J~aAB  
   } z*6$&sS\>  
  } KHvIN}V5?3  
 } "@.Z#d|Y  
 return bRemoved; MWM +hk1fs  
} qE>i,|rP`  
|vv]Z(_  
void VerifyWindow() 6 -]>]Hr-  
{ B ,V( LTE  
 for(int i=0;i<MAX_KEY;i++){ +.w[6  
  if(hCallWnd!=NULL){ @. "q  
   if(!IsWindow(hCallWnd)){ gf+o1\5t@  
    hCallWnd=NULL; __ 8&Jv\  
    HotKey=0; KzV.+f  
    HotKeyMask=0; FyCBN tCv  
    KeyCount--; ('=Z }~  
   } X$/E>I  
  } I$n+DwKcN  
 } ^>-+@+( r  
} qtO1hZ  
PmHd9^C  
BOOL CHookApp::InitInstance() ]de\i=?|  
{ Ujf,6=M  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WPIZi[hBs  
 hins=AfxGetInstanceHandle(); cI5N"U@yN  
 InitHotkey(); Tj=gRQ2v  
 return CWinApp::InitInstance(); UL&} s_  
} > 84e`aGE  
4 bn t=5]  
int CHookApp::ExitInstance() *t^eNUA  
{ NN^QUB  
 VerifyWindow(); \UOm]z  
 UnInit(); j(sLK &  
 return CWinApp::ExitInstance(); W;qP=DK2  
} C?/r;  
J2m"1gq,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 22z1g(; @  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) DacN {r"3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >E, Q  
#if _MSC_VER > 1000 yX`#s]M  
#pragma once 1DUb [W8  
#endif // _MSC_VER > 1000 q]K'p,'  
"rsSW 3_  
class CCaptureDlg : public CDialog n!ZMTcK8  
{ mB~~_]M N  
 // Construction ^ESUMXb  
 public: `g--QR  
  BOOL bTray; \6{LR&  
  BOOL bRegistered; +s ULo  
  BOOL RegisterHotkey(); $%=G[/i'  
  UCHAR cKey; / $_M@>  
  UCHAR cMask; "mR*7o$|  
  void DeleteIcon(); 6(Vhtr2( *  
  void AddIcon(); J smB^  
  UINT nCount; ;`+`#h3-V  
  void SaveBmp(); m^Glc?g<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ls1B \Aw_  
  // Dialog Data _B3zRO  
  //{{AFX_DATA(CCaptureDlg) TKo<~?  
  enum { IDD = IDD_CAPTURE_DIALOG }; #ra*f~G  
  CComboBox m_Key; L!,d"wuD  
  BOOL m_bControl; 2 L:$aZ  
  BOOL m_bAlt; W2hA-1  
  BOOL m_bShift; )&:L'N  
  CString m_Path; Jld\8=  
  CString m_Number; BKay*!'PX  
  //}}AFX_DATA h/HH Kn  
  // ClassWizard generated virtual function overrides >k;p.Pay%  
  //{{AFX_VIRTUAL(CCaptureDlg) \%TyrY+`K  
 public: \^0!|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =G4u#t)  
 protected: *1$    
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P_&p=${  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nM8[  
  //}}AFX_VIRTUAL *GJ:+U&m[  
  // Implementation e\D| o?v  
 protected: U7h(-dV   
  HICON m_hIcon; a~opE!|m  
  // Generated message map functions w^Ag]HZN  
  //{{AFX_MSG(CCaptureDlg) 6Hk="$6K  
  virtual BOOL OnInitDialog(); 8eN7VT eb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \x(^]/@  
  afx_msg void OnPaint(); f}iU& 3S  
  afx_msg HCURSOR OnQueryDragIcon(); dw9T f^V  
  virtual void OnCancel(); hO3 {  
  afx_msg void OnAbout(); Wo!;K|~P  
  afx_msg void OnBrowse(); u h )o  
  afx_msg void OnChange(); {n&Uf{  
 //}}AFX_MSG k3>YBf`fC  
 DECLARE_MESSAGE_MAP() W:vr@e6  
}; FY4T(4#  
#endif F?BS717qS%  
<( EyXV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wt?o 7R2  
#include "stdafx.h" UFw](%=&M  
#include "Capture.h" bq NP#C  
#include "CaptureDlg.h" ,EI:gLH  
#include <windowsx.h> YG`? o  
#pragma comment(lib,"hook.lib") kAo.C Nj7  
#ifdef _DEBUG o_$&XNC_  
#define new DEBUG_NEW ($8t%jVWJJ  
#undef THIS_FILE I]9 C_  
static char THIS_FILE[] = __FILE__; \f%.n]>  
#endif 8EI:(NE*J  
#define IDM_SHELL WM_USER+1 "%@v++4y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X{\jK]O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ),` 8eQC  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ix&'0IrX*  
class CAboutDlg : public CDialog lP3h<j  
{ orqJ[!u)`  
 public: y' [LNp V  
  CAboutDlg(); Z9[+'ZWt  
  // Dialog Data ||Y<f *  
  //{{AFX_DATA(CAboutDlg) ~=cmM  
  enum { IDD = IDD_ABOUTBOX }; z_&P?+"Df  
  //}}AFX_DATA S-c ^eLzQ  
  // ClassWizard generated virtual function overrides }`_(<H  
  //{{AFX_VIRTUAL(CAboutDlg) 2hq\n<  
 protected: cP rwW 6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IZrk1fh  
  //}}AFX_VIRTUAL t,<UohL|z  
  // Implementation (>7>3  
 protected: >bIF>9T  
  //{{AFX_MSG(CAboutDlg) :FHA]oec1  
  //}}AFX_MSG Ej"u1F14J  
  DECLARE_MESSAGE_MAP() !YE zFU`L  
}; # yN*',I&  
|`0n"x7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pW|u P8#  
{ tTuX\;G  
 //{{AFX_DATA_INIT(CAboutDlg) |]sx+NlNc  
 //}}AFX_DATA_INIT {dzoEM[ 1s  
} =;ICa~`C;  
L'E^c,-x~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) fYX<d%?7  
{ eV2mMSY  
 CDialog::DoDataExchange(pDX); =w%Oa<  
 //{{AFX_DATA_MAP(CAboutDlg) .zkP~xQ~  
 //}}AFX_DATA_MAP Md&WJ };L  
} eB]R3j{  
 rLv;Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7lA:)a_!]  
 //{{AFX_MSG_MAP(CAboutDlg)  f^b K=#  
 // No message handlers N`$!p9r  
 //}}AFX_MSG_MAP 3WUH~l{UJ  
END_MESSAGE_MAP() #*^+F?o,(  
5-vo0:hk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "pvH0"Q*  
: CDialog(CCaptureDlg::IDD, pParent) #g9ZX16}  
{ xDjV `E]  
 //{{AFX_DATA_INIT(CCaptureDlg) T?wzwGp-[  
  m_bControl = FALSE; |"Z{I3Umg  
  m_bAlt = FALSE; <+tD z(  
  m_bShift = FALSE; Jp~zX lu  
  m_Path = _T("c:\\"); X.V[0$.;  
  m_Number = _T("0 picture captured."); L:R<e#kgS  
  nCount=0; \#Up|u:  
  bRegistered=FALSE; DL8x":;  
  bTray=FALSE; 8Vn4.R[vE  
 //}}AFX_DATA_INIT 7o]HQ[xO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 )jDJMi_[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6Q Zp@  
} j-b*C2l  
&c%Y<1e`%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0XU}B\'<  
{ r>t1 _b+nu  
 CDialog::DoDataExchange(pDX); ,wj"! o#  
 //{{AFX_DATA_MAP(CCaptureDlg) jndGiMA  
  DDX_Control(pDX, IDC_KEY, m_Key); ?Bx./t><  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); EgM*d)X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); JL^2l$up  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ',=g;  
  DDX_Text(pDX, IDC_PATH, m_Path); 5V5w:U>_z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~ 'Vxg}  
 //}}AFX_DATA_MAP C9~~O~7x  
} #Dy?GB08  
h~} .G{"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) l#qv 5f  
//{{AFX_MSG_MAP(CCaptureDlg) ^@6q  
 ON_WM_SYSCOMMAND() 7E7dSq  
 ON_WM_PAINT() Xm!-~n@-m7  
 ON_WM_QUERYDRAGICON() .~D>5 JnEk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !8RwO%c(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I4c!m_sr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) <L0#O(L  
//}}AFX_MSG_MAP r4XH =  
END_MESSAGE_MAP() G| m4m.  
5iX! lAFJ  
BOOL CCaptureDlg::OnInitDialog() ~)]} 91p  
{ 1vevEa$  
 CDialog::OnInitDialog(); ULqoCd%bK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^{yk[tHpS  
 ASSERT(IDM_ABOUTBOX < 0xF000); {2KFD\i\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %D=]ZV](  
 if (pSysMenu != NULL)  zGlZ!t:  
 { L}k/9F.5  
  CString strAboutMenu; K_&MoyJJ9f  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9S7A!AKE  
  if (!strAboutMenu.IsEmpty()) 3Ofc\  
  { qUJ aeQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); p( LZ)7/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E-2 eOT  
  } Y] g?2N=E  
 } G4-z3e,crr  
 SetIcon(m_hIcon, TRUE); // Set big icon vqdX^m^PY  
 SetIcon(m_hIcon, FALSE); // Set small icon I PCGt{B~  
 m_Key.SetCurSel(0); \XzM^K3  
 RegisterHotkey(); _^ |2}t  
 CMenu* pMenu=GetSystemMenu(FALSE); R9o-`Wz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,<Kx{+ [h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i@P}{   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); jLVl4h&  
 return TRUE; // return TRUE unless you set the focus to a control W;_E4  
} l.=p8-/$'7  
g=8un`]7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !q"cpL'4  
{ 42C<1@>zO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) !cX[-}Q  
 { ~N0 sJ%  
  CAboutDlg dlgAbout; V!/:53  
  dlgAbout.DoModal(); z8_XX$Mnt  
 } Ctu?o+^;z  
 else ~qP[eWe  
 { >{zk qvsQ&  
  CDialog::OnSysCommand(nID, lParam); x!< yT?A  
 } nHXX\i  
} \IM4Z|NN"  
45 >XKr.%  
void CCaptureDlg::OnPaint() ?h8{xa5b  
{ L"+$Wc[|  
 if (IsIconic()) }j {!-&  
 { X[$++p .  
  CPaintDC dc(this); // device context for painting t#E}NR  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eVh - _  
  // Center icon in client rectangle Sus;(3EX  
  int cxIcon = GetSystemMetrics(SM_CXICON); bZwnaM4"F  
  int cyIcon = GetSystemMetrics(SM_CYICON); qL /7^) (  
  CRect rect; z?]G3$i(  
  GetClientRect(&rect); -0uV z)  
  int x = (rect.Width() - cxIcon + 1) / 2; 2 @j";+  
  int y = (rect.Height() - cyIcon + 1) / 2; 7Ke&0eAw  
  // Draw the icon rRFAD{5)  
  dc.DrawIcon(x, y, m_hIcon); olux6RP[B  
 } }?8uH/+ZA  
 else Fj p.T;  
 { :$3oFN*g  
  CDialog::OnPaint(); WgQBGch,!  
 } rS XzBi{  
} kAYb!h[`  
B 9dt=j3j2  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1 jb/o5n;  
{ F\JUx L@8  
 return (HCURSOR) m_hIcon; K95;rd  
} MjL)IgT  
} ?@5W,  
void CCaptureDlg::OnCancel() e&<yX  
{ 0ezYdS~o  
 if(bTray) , \)a_@@k  
  DeleteIcon(); +>f<EPGn  
  CDialog::OnCancel(); Q 9F)  
} W&Y"K)`  
mu]as: ~  
void CCaptureDlg::OnAbout() (=x"Y{%  
{ D@ek9ARAq  
 CAboutDlg dlg; )u:Q) %$t  
 dlg.DoModal(); 32)tJ|m  
} QCOo  
^rNUAj9Z  
void CCaptureDlg::OnBrowse() p*QKK@C  
{ <[ Xw)/#  
 CString str; ?X$, fQ#F|  
 BROWSEINFO bi; giY80!GX  
 char name[MAX_PATH]; 3INI?y}t   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xl9aV\W  
 bi.hwndOwner=GetSafeHwnd(); D=f7NVc>Q  
 bi.pszDisplayName=name; : esg(  
 bi.lpszTitle="Select folder"; Y$>-%KcKeI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bzpFbfb  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )eeN1G`rDE  
 if(idl==NULL) 3 fj  
  return; p/6zEZ*  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p zw8T  
 str.ReleaseBuffer(); c7uG9  
 m_Path=str; ~"x5U{K48S  
 if(str.GetAt(str.GetLength()-1)!='\\') <!d"E@%v@  
  m_Path+="\\"; "8f?h%t  
 UpdateData(FALSE); j V3)2C}  
} h!@,8y[B  
E$s/]wnr[  
void CCaptureDlg::SaveBmp() kh$_!BT  
{ g\fhp{gWB  
 CDC dc; PG%0yv%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); R{YzH56M  
 CBitmap bm; a dfR!&J  
 int Width=GetSystemMetrics(SM_CXSCREEN); +FG$x/\*0  
 int Height=GetSystemMetrics(SM_CYSCREEN); C]u',9,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9' 1B/{  
 CDC tdc; ff? t[GS  
 tdc.CreateCompatibleDC(&dc); Rg&- 0b  
 CBitmap*pOld=tdc.SelectObject(&bm); )}v 3q6?_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); R9vT[{!i  
 tdc.SelectObject(pOld); $"JpFT  
 BITMAP btm; +!t}  
 bm.GetBitmap(&btm); }CL"S_>1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &jA\hg#9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *hhmTc#  
 BITMAPINFOHEADER bih; l(W[_ D  
 bih.biBitCount=btm.bmBitsPixel; 4Aes#{R3v  
 bih.biClrImportant=0; ,Dmc2D  
 bih.biClrUsed=0; ]:]H:U]p  
 bih.biCompression=0; +]xFoH  
 bih.biHeight=btm.bmHeight; %hS|68pN6  
 bih.biPlanes=1; e'*HS7g  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5i6 hp;=  
 bih.biSizeImage=size; >B -q@D  
 bih.biWidth=btm.bmWidth; AIl4]F5I  
 bih.biXPelsPerMeter=0; S:Q! "U  
 bih.biYPelsPerMeter=0; : 9!%ZD  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "bQ[CD  
 static int filecount=0; jF"YTr6  
 CString name; >cMd\%^t  
 name.Format("pict%04d.bmp",filecount++);  P\m7 -  
 name=m_Path+name; le)DgIT>=  
 BITMAPFILEHEADER bfh; 8ip7^  
 bfh.bfReserved1=bfh.bfReserved2=0; .Ce8L&cU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nt1CTWKM8^  
 bfh.bfSize=54+size;  v9RW5  
 bfh.bfOffBits=54; *V^ #ga#A  
 CFile bf; &[R8Q|1 j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8^^[XbH  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MhEw _{?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !eR3@%4  
  bf.WriteHuge(lpData,size); S0/usC[r  
  bf.Close(); $P o}  
  nCount++; 'm=*u SJK  
 } 8OhDjWVJ  
 GlobalFreePtr(lpData); 4DWwbO  
 if(nCount==1) [dX`K`k  
  m_Number.Format("%d picture captured.",nCount); n| O [a6G  
 else yqOuX>m1c  
  m_Number.Format("%d pictures captured.",nCount); e&q?}Ho  
  UpdateData(FALSE);  l]!9$  
} '(+<UpG_Q}  
Tpp&  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?^#lWx q  
{ 's x\P[a  
 if(pMsg -> message == WM_KEYDOWN) qOV[TP,  
 { 34|a\b}  
  if(pMsg -> wParam == VK_ESCAPE) T$4P_*  
   return TRUE;  4-Z()F  
  if(pMsg -> wParam == VK_RETURN) HjNxqaljt  
   return TRUE; Btt]R  
 } Yepe=s+9  
 return CDialog::PreTranslateMessage(pMsg); er.L7  
} al9.}  
QrG`&QN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gIEl.  
{ zzGYiF ?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I8Vb-YeS  
  SaveBmp(); \kam cA  
  return FALSE; )U<Y0bZA!  
} )u ?' ;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O%!5<8Xrb  
 CMenu pop; u'A#%}3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~3h-jK?  
 CMenu*pMenu=pop.GetSubMenu(0); pY8q=Kl  
 pMenu->SetDefaultItem(ID_EXITICON); KGHq rc  
 CPoint pt; V:NI4dv/R  
 GetCursorPos(&pt); XJ0 {  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FE7)E.U  
 if(id==ID_EXITICON) rEZ8eeB[3  
  DeleteIcon(); hv$yV%.`  
 else if(id==ID_EXIT) m#H3:-h,  
  OnCancel(); Ei>m0 ~<\  
 return FALSE; -|yb[~3  
} AF,BwLN  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HG >j5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Br>Fpe$q4  
 AddIcon(); u~zs* qp  
 return res; lb' Cl3H  
} `'_m\uo  
7\ SUr9[  
void CCaptureDlg::AddIcon() BZK`O/  
{ 4pz|1Hw7  
 NOTIFYICONDATA data; }A$WO {2  
 data.cbSize=sizeof(NOTIFYICONDATA); }f>H\iJe  
 CString tip; + bhym+  
 tip.LoadString(IDS_ICONTIP); vdoZ&Tu  
 data.hIcon=GetIcon(0); )wXuwdc[  
 data.hWnd=GetSafeHwnd(); >"3>s%  
 strcpy(data.szTip,tip); #S g\q8(O  
 data.uCallbackMessage=IDM_SHELL; L?&'xzt B  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ni&*E~a  
 data.uID=98; 6X g]/FD  
 Shell_NotifyIcon(NIM_ADD,&data); }*U[>Z-eO  
 ShowWindow(SW_HIDE); 2Nc>6  
 bTray=TRUE; -5G)?J/*  
} 96Wp!]*  
=;~I_)Pg1  
void CCaptureDlg::DeleteIcon() 1{"llD  
{ ?z-}>$I;  
 NOTIFYICONDATA data; ^>4o$}  
 data.cbSize=sizeof(NOTIFYICONDATA); OvL\u{(<F  
 data.hWnd=GetSafeHwnd(); 72oWhX=M%  
 data.uID=98; s0UFym 8  
 Shell_NotifyIcon(NIM_DELETE,&data); qd@&59zSh  
 ShowWindow(SW_SHOW); )4Q?aMm  
 SetForegroundWindow(); .] 4W!])9  
 ShowWindow(SW_SHOWNORMAL); hm$X]H`uMX  
 bTray=FALSE; jZfx Jm  
} 3M*Bwt;F_  
U4?(A@z9^  
void CCaptureDlg::OnChange() m@Ev~~;  
{ $9 p!Y}  
 RegisterHotkey(); &(rWwOo6  
} _,h@:Xij  
=(AtfW^H  
BOOL CCaptureDlg::RegisterHotkey() n_K~ vD  
{ T>>YNaUL  
 UpdateData(); ;a"q'5+Ne  
 UCHAR mask=0; 2+8#H.  
 UCHAR key=0; y9Y1PH7G  
 if(m_bControl) ]bCq=6ZKR  
  mask|=4; d~tuk4F  
 if(m_bAlt) l":c  
  mask|=2; )bOBQbj  
 if(m_bShift) 5R MS(  
  mask|=1; $e%2t^ i.g  
  key=Key_Table[m_Key.GetCurSel()]; 2R-A@UE2  
 if(bRegistered){ $.6K!x{(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ihL/n  
  bRegistered=FALSE; @* 1U{`  
 } TrVWv  
 cMask=mask; ~IVd vm7  
 cKey=key; <T?oKOD ]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OqhD7 +  
 return bRegistered; 6V9doP]i  
} &`|:L(+  
~K_Uq*dCE  
  四、小结 <{(/E0~V/<  
^o?SM^  
  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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