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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: yaR;  
  }Voh5*$E`  
  一、实现方法 <d5vVn  
I !<v$  
  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: Qy/bzO  
c_a$g  
#pragma data_seg("shareddata") +l/j6)O`(m  
HHOOK hHook =NULL; //钩子句柄 EH "g`r  
UINT nHookCount =0; //挂接的程序数目 M>J ADt_]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o%QQ7S3 P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d$,i?d,  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -pGt ;  
static int KeyCount =0; *(MvNN*  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 {n{}Y.  
#pragma data_seg() dGteYt_F  
3ElpS^ 2W  
  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。 l=]vC +mU  
XZ&v3ul  
  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: Yr=mLT|JN  
1;gSf.naG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 2!otVz! Mh  
cKey,UCHAR cMask) ,< icW &a  
{ uWInx6p  
 BOOL bAdded=FALSE; QPcB_wUqu  
 for(int index=0;index<MAX_KEY;index++){ >oNk(. %  
  if(hCallWnd[index]==0){ )IhY&?jk?  
   hCallWnd[index]=hWnd; GDB>!ukg  
   HotKey[index]=cKey; %UJ4wm  
   HotKeyMask[index]=cMask; )x7hhEk=^  
   bAdded=TRUE; #"{8Z&Z  
   KeyCount++; piFQ7B  
   break; y&Hh8|'mC  
  } OA=;9AcZ  
 } ?.4l1X6Ba  
 return bAdded; ibc/x v2  
} .am*d|&+G  
//删除热键 ~=mM/@HD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,h._iO)I^  
{ p,8Z{mLn  
 BOOL bRemoved=FALSE; MX0B$yc$  
 for(int index=0;index<MAX_KEY;index++){ j1kc&(  
  if(hCallWnd[index]==hWnd){ `x VA]GR4c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zNf5OItx  
    hCallWnd[index]=NULL; UIj/Id  
    HotKey[index]=0; %$x FnGb  
    HotKeyMask[index]=0; 6 {Z\cwP)c  
    bRemoved=TRUE; x+e _pb   
    KeyCount--; yMkd|1  
    break; s- V$N  
   } ,AM-cwwT:u  
  } eFI4(Y  
 } P.B'Gh#^  
 return bRemoved; ]c2| m}I{:  
} OJ 5 !+#>  
y21uvp'  
2AW{qwk7  
  DLL中的钩子函数如下: Sh6Cw4 R  
Vgn1I(Gj4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZRm\d3x4  
{ bVHi3=0{  
 BOOL bProcessed=FALSE; |pR$' HO  
 if(HC_ACTION==nCode) OP}p;(  
 { \AzcW;03g[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 AyO|9!F@A  
   switch(wParam) BD-=y  
   {  K:@=W1  
    case VK_MENU: OF/)-}!  
     MaskBits&=~ALTBIT; q)b?X ^  
     break; QZox3LM1&.  
    case VK_CONTROL: >NA7,Z2.  
     MaskBits&=~CTRLBIT; NF!1)  
     break; r![JPhei  
    case VK_SHIFT: n^02@Aw  
     MaskBits&=~SHIFTBIT; Ds_ "m,  
     break; Z|% 2495\  
    default: //judge the key and send message ?\M6P?tpo&  
     break; zpqNmxmF  
   } # :w2Hf6Q  
   for(int index=0;index<MAX_KEY;index++){ PZJ 4: h  
    if(hCallWnd[index]==NULL) F:S>\wG,  
     continue; ]Hy PJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]/Qy1,  
    { MwqT`;lb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); veg!mY2&  
     bProcessed=TRUE; /$,=>  
    } D#1~]d  
   } 1T,PC?vr{  
  } _l=  
  else if((lParam&0xc000ffff)==1){ //有键按下 UiZp -Y%ki  
   switch(wParam) C}'="g^=sl  
   { Ef!p:HBJ  
    case VK_MENU: gdE`UZ\  
     MaskBits|=ALTBIT; >1G*ya)  
     break; {taVAcb  
    case VK_CONTROL: 8G] m7Z  
     MaskBits|=CTRLBIT; h)^A3;2F  
     break; eI rmD  
    case VK_SHIFT: zN)\2  
     MaskBits|=SHIFTBIT; E2H<{Q   
     break; WcO,4:  
    default: //judge the key and send message ;OU>AnWr(&  
     break; ;;hyjFGq%  
   } {FY[|:Cp  
   for(int index=0;index<MAX_KEY;index++){ t`ceVS  
    if(hCallWnd[index]==NULL) A=d$ir K[  
     continue; 6H,=S`V]EK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )2Ru!l#  
    { YQdX>k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R 0HVLQI  
     bProcessed=TRUE; .]s( c!{y  
    } 2 RUR=%C  
   } EvQwGt1)P  
  } ##FNq#F  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 yPh2P5}H>  
   for(int index=0;index<MAX_KEY;index++){ S/<"RfVU#o  
    if(hCallWnd[index]==NULL) hdJwNmEA>  
     continue; [RPAkp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UW[{d/.wC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0/@ X!|X  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Jhy t)@7/,  
   } 6.h   
  } Df:7P>  
 } A a} o*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kefv=n*]l  
} I#E(r>KW*  
l()MYuLNV  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 2, "q_d'V  
o?mXxL)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N46$EsO!h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k7|z$=zY  
Gh[`q7B Q  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: (S)E|;f%C  
tWSvxGCzn%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .n& Cq+U;  
{ A9l})_~i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {_XrZ(y/  
 { v;]I^Kq  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BT#=Xh  
  SaveBmp(); k3>ur>aW  
  return FALSE; }#HTO:r  
 } +}1hU :qW  
 …… //其它处理及默认处理 AOlt,MNpQ  
} f./m7TZ  
omv6_DdZ  
hQ}7Z&O  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 C nSX  
Xvj=*wg\Y  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 f UF;SqT  
?(/j<,m^  
  二、编程步骤 mDF"&.(j  
seuN,jpt  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]a6O(]  
Ly)(_Tp@+  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; SQt|(r)  
wL-ydMIx  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; _m7U-;G  
od}EM_  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; vf'cx:m  
`!omzE*bk5  
  5、 添加代码,编译运行程序。 {nQ)4.e6  
S}w.#tyEn  
三、程序代码 0i*'N ch#i  
w~$c= JO#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ewAH'H]o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ~S^X"8(U  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ HLSfoQ&)v  
#if _MSC_VER > 1000 juCG?}di;  
#pragma once Dpdn%8+Z  
#endif // _MSC_VER > 1000 <cDKGd  
#ifndef __AFXWIN_H__ C](z#c~c  
#error include 'stdafx.h' before including this file for PCH fEj9R@u+h  
#endif g>!:U6K  
#include "resource.h" // main symbols v dH+>l  
class CHookApp : public CWinApp jKj=#O  
{ S0N2rU  
 public: (lN;xT`=  
  CHookApp(); oF;%^XFp  
  // Overrides HCJ8@nki  
  // ClassWizard generated virtual function overrides dgco*TIGO  
  //{{AFX_VIRTUAL(CHookApp) v;fJM5PA  
 public: s ~Lfi.  
  virtual BOOL InitInstance(); ~[zFQ)([  
  virtual int ExitInstance(); -OrY{^F  
  //}}AFX_VIRTUAL 0\cnc^Z  
  //{{AFX_MSG(CHookApp) ntj`+7mw  
  // NOTE - the ClassWizard will add and remove member functions here. =|E 09  
  // DO NOT EDIT what you see in these blocks of generated code ! B0)`wsb_  
  //}}AFX_MSG 8 _4l"v p  
  DECLARE_MESSAGE_MAP() oI_oz0nHk  
}; OB?SkR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); kRN|TDx(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); : F7k{~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b8N[."~:  
BOOL InitHotkey(); ).NcLJw_  
BOOL UnInit(); CJ9cCtA  
#endif %XJQ0CE<(  
w.J%qWJq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. +X:J]- 1)  
#include "stdafx.h" K,eqD<  
#include "hook.h" U#;51 _  
#include <windowsx.h> _/,SZ-C#L4  
#ifdef _DEBUG v)@,:u)  
#define new DEBUG_NEW oe(9mYWKa6  
#undef THIS_FILE t1e4H=d>  
static char THIS_FILE[] = __FILE__; 5c: '>  
#endif IjG5X[@  
#define MAX_KEY 100 c q*p9c  
#define CTRLBIT 0x04 _m9~*  
#define ALTBIT 0x02 `E3:;|  
#define SHIFTBIT 0x01  2Vp>"  
#pragma data_seg("shareddata") "_K}rI6(t  
HHOOK hHook =NULL; m<FF$pTT  
UINT nHookCount =0; Dq/3E-y5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8W~lU~-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 45x,|h[F{5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SkiJ pMN  
static int KeyCount =0; 7fTxGm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !uWxRpT,7  
#pragma data_seg() 5%<TF .;-J  
HINSTANCE hins;  d?:`n 9`  
void VerifyWindow(); V~OUE]]Q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }FPM-M3y  
//{{AFX_MSG_MAP(CHookApp) {UB%(E[Mr  
// NOTE - the ClassWizard will add and remove mapping macros here. HUj+-  
// DO NOT EDIT what you see in these blocks of generated code! [O^}rUqq  
//}}AFX_MSG_MAP N0=-7wMk(Z  
END_MESSAGE_MAP() CE~r4  
<fNGhmL  
CHookApp::CHookApp() r_Lu~y|  
{ luW <V>  
 // TODO: add construction code here, h ZoC _\  
 // Place all significant initialization in InitInstance (E!%v`_0  
} |/@0~O(6  
xME(B@j  
CHookApp theApp; mR"uhm}q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) It%T7 X#  
{ o;3j:# 3 |  
 BOOL bProcessed=FALSE; fO*)LPen.z  
 if(HC_ACTION==nCode) " Wp   
 { hIR@^\?  
  if((lParam&0xc0000000)==0xc0000000){// Key up qh%i5Mu  
   switch(wParam) oG!6}5  
   { ~6p5H}'H1  
    case VK_MENU: 6 |QTS|!  
     MaskBits&=~ALTBIT; P,(9cyS{  
     break; ~\2;i]|  
    case VK_CONTROL: ucw`;<d8  
     MaskBits&=~CTRLBIT; mHKJ  
     break; t-_#Q bzE{  
    case VK_SHIFT: XmP;L(wa   
     MaskBits&=~SHIFTBIT; avlqDi1l  
     break; I$n+DwKcN  
    default: //judge the key and send message xXOR IlD  
     break; i wUv`>l&  
   } <BSSa`N`  
   for(int index=0;index<MAX_KEY;index++){ aZ$/<|y~:_  
    if(hCallWnd[index]==NULL) FIH@2zA  
     continue; C?,*U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M3ZOk<O<R  
    { Q\H_t)-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wY/bA}%  
     bProcessed=TRUE; JlUb0{8PE  
    } sTiYf  
   } Q*gnAi&.#  
  } oWI!u 5  
  else if((lParam&0xc000ffff)==1){ //Key down }@wVW))6$  
   switch(wParam) Ddb-@YD&+0  
   { ?fV?|ZGZI  
    case VK_MENU: v{r1E]rY  
     MaskBits|=ALTBIT; iecWa:('  
     break; /^Y[*5  
    case VK_CONTROL: +@e }mL\8  
     MaskBits|=CTRLBIT;  012Lwd  
     break; :i.t)ES  
    case VK_SHIFT:  m;c3Z-  
     MaskBits|=SHIFTBIT; Wj&nUp{  
     break; $|k%@Q>  
    default: //judge the key and send message 975 _d_U  
     break; xpAok]  
   } &Y+e=1a+  
   for(int index=0;index<MAX_KEY;index++) QCWf.@n  
   { wZQ)jo7*g  
    if(hCallWnd[index]==NULL) ^_sQG  
     continue; $(3uOsy   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [P{a_(  
    { )AI?x@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 40u7fojg2  
     bProcessed=TRUE; !~)90Z!  
    } \0nlPXk?G  
   } h(nj,X+  
  } >zQOK-  
  if(!bProcessed){ RpYcD  
   for(int index=0;index<MAX_KEY;index++){ T<P0T<  
    if(hCallWnd[index]==NULL) ]w!0u2K<Q\  
     continue; fH[Wkif  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G{+2x N a(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); FNC[59   
   } 1eHe~p ,  
  } +Juh:1H  
 } 6|5H=*)DH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `^x9(i/NE  
} )&:L'N  
Jld\8=  
BOOL InitHotkey() 1 DqX:WM6  
{ h/HH Kn  
 if(hHook!=NULL){ 3 <9{v  
  nHookCount++; ~g7m3  
  return TRUE; hCAZ{+`z  
 } KzNm^^#/$A  
 else J'e]x[Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Z|I-BPyn  
  if(hHook!=NULL) LL.x11 o3  
   nHookCount++; pw\P<9e=  
  return (hHook!=NULL); oR#Ob#&  
} }RIU8=P  
BOOL UnInit() <UT>PCNG  
{ N'QqJe7Z  
 if(nHookCount>1){ JaI Kjn  
  nHookCount--; aBxiK[[`  
  return TRUE; 7 \X$7  
 } {~_ Y _-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Bd&`Xfebj  
 if(unhooked==TRUE){ WI&lj<*  
  nHookCount=0; gw+eM,Yp  
  hHook=NULL; &iBNO,v  
 } !zR)D|w&  
 return unhooked; 1'Rmg\(  
} Xh}&uZ`A  
9 I{/zKq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y^R4I_* z  
{ ezUQ> e  
 BOOL bAdded=FALSE; RYy,wVh}  
 for(int index=0;index<MAX_KEY;index++){ D:9 2\l  
  if(hCallWnd[index]==0){ Q+'nw9:;T  
   hCallWnd[index]=hWnd; UV@0gdy[  
   HotKey[index]=cKey; G?xJv`"9iC  
   HotKeyMask[index]=cMask; Bd# TUy  
   bAdded=TRUE; O,'#C\   
   KeyCount++; E7`qmn  
   break; 64umul  
  } +rc SL8C  
 } Q|c|2byb  
 return bAdded; $gvr -~  
} ?:uNN  
VD [pZ2;4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "VTF}#Uo  
{ )R &,'`\  
 BOOL bRemoved=FALSE; DpvrMI~I_  
 for(int index=0;index<MAX_KEY;index++){ <#*.}w~  
  if(hCallWnd[index]==hWnd){ ^~1<f1(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wd+K`I/v7h  
    hCallWnd[index]=NULL; I 8z G~L%"  
    HotKey[index]=0; d:rGyA]  
    HotKeyMask[index]=0; $FX,zC<=  
    bRemoved=TRUE; g`[$Xi R  
    KeyCount--; IPtvuEju\  
    break; (s&&>M]r_  
   } ?\y%]1  
  } |<c WllN  
 } "HK/u(z)  
 return bRemoved; E ]f)Os$  
} D(\$i.,b2  
Bm/YgQi  
void VerifyWindow() r,;\/^u*  
{ =J/FJb  
 for(int i=0;i<MAX_KEY;i++){ ,b|-rU\  
  if(hCallWnd!=NULL){ Ch5+N6c^  
   if(!IsWindow(hCallWnd)){ :NE/Ddgc'  
    hCallWnd=NULL; # {PmNx%M  
    HotKey=0; ppN} k)m  
    HotKeyMask=0; H=~9CJ+tc  
    KeyCount--; bRsTBp;R`I  
   } _A'{la~k  
  } {/ 2E*|W~I  
 } Mu&x_&|  
} fk{0d  
m4m<nnM  
BOOL CHookApp::InitInstance() DQ80B)<O  
{ N+g@8Q2s;5  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); goZ V.,w  
 hins=AfxGetInstanceHandle(); <Ef[c@3  
 InitHotkey(); PJ\0JR7a  
 return CWinApp::InitInstance(); {_>em*Vb  
} 5o 0Ch  
kbI/4IRW  
int CHookApp::ExitInstance() NX,-;v  
{ qLK?%?.N<  
 VerifyWindow(); Adx`8}N8  
 UnInit(); $/Ov2z  
 return CWinApp::ExitInstance(); VW<0Lt3  
} (.23rVvnT@  
j.|U=)E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,D=fFpn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) caq} &A]C  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ tef^ShF]  
#if _MSC_VER > 1000 46No%cSiG  
#pragma once ^%<pJMgdF  
#endif // _MSC_VER > 1000 K7(MD1tk  
r>t1 _b+nu  
class CCaptureDlg : public CDialog ,wj"! o#  
{ jndGiMA  
 // Construction ?Bx./t><  
 public: vHKlLl>*2  
  BOOL bTray; <02m%rhuW  
  BOOL bRegistered; qJv[MBjk3B  
  BOOL RegisterHotkey(); r'4:)~]s  
  UCHAR cKey; eJ@~o{,?>  
  UCHAR cMask; GbZ;#^S  
  void DeleteIcon(); K=\O5#F?3  
  void AddIcon();  jNyoN1M  
  UINT nCount; #&8rcu;/  
  void SaveBmp(); 7Y( 5]A9=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P'$ `'J]j  
  // Dialog Data u8L$]vOg  
  //{{AFX_DATA(CCaptureDlg) I;MD>%[W,  
  enum { IDD = IDD_CAPTURE_DIALOG }; fiDl8=~@  
  CComboBox m_Key; V5mTu)tp5  
  BOOL m_bControl; (6gK4__}]  
  BOOL m_bAlt; )"<8K}%!  
  BOOL m_bShift; s8mr''  
  CString m_Path; 0L-!! c3  
  CString m_Number; 5iX! lAFJ  
  //}}AFX_DATA ~)]} 91p  
  // ClassWizard generated virtual function overrides 1vevEa$  
  //{{AFX_VIRTUAL(CCaptureDlg) ULqoCd%bK  
 public: =xN= #  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -:Rp'SJ  
 protected: EL{vFP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nt :N!suP3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T)iW`vZg8  
  //}}AFX_VIRTUAL S4o$t -9l  
  // Implementation tkKJh !Q7  
 protected: {6Au3gt/  
  HICON m_hIcon; !CY&{LEYn0  
  // Generated message map functions [iS$JG-  
  //{{AFX_MSG(CCaptureDlg) iCQ>@P]nE  
  virtual BOOL OnInitDialog(); 7jG(<!,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ROb\Rx m  
  afx_msg void OnPaint(); 19U]2D/z  
  afx_msg HCURSOR OnQueryDragIcon(); !{%:qQiA  
  virtual void OnCancel(); $jzFc!rs  
  afx_msg void OnAbout(); hZ$t$3  
  afx_msg void OnBrowse(); dp5cDF}l  
  afx_msg void OnChange(); ku&k'V  
 //}}AFX_MSG `` K#}3  
 DECLARE_MESSAGE_MAP() 5K%W a]W  
}; ~Ci{3j :]  
#endif {S.>BXX  
R^&q-M=O[  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8Cx^0  
#include "stdafx.h" 1Y j~fb(  
#include "Capture.h" 7<\C ?`q"  
#include "CaptureDlg.h" C(?blv-vM0  
#include <windowsx.h> V-yUJ#f8[  
#pragma comment(lib,"hook.lib") tT%/r,  
#ifdef _DEBUG Ri7((x]H"  
#define new DEBUG_NEW t67Cv/r~  
#undef THIS_FILE L:&k(YOBA  
static char THIS_FILE[] = __FILE__; E8[T   
#endif v3[@1FQ"  
#define IDM_SHELL WM_USER+1 TLa]O1=Bf.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o*S"KX $  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X[$++p .  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t#E}NR  
class CAboutDlg : public CDialog I/J7rkf  
{ sy5 Fn~\R  
 public: ?}P5p^6  
  CAboutDlg(); ^"8wUsP  
  // Dialog Data Hf gz02Z$  
  //{{AFX_DATA(CAboutDlg) b7:0#l$  
  enum { IDD = IDD_ABOUTBOX }; s][24)99  
  //}}AFX_DATA [U{UW4  
  // ClassWizard generated virtual function overrides &:#h$`4  
  //{{AFX_VIRTUAL(CAboutDlg) =6nD sibf  
 protected: 5jcte< 5I_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S=|@L<O  
  //}}AFX_VIRTUAL L@Nu/(pB=  
  // Implementation LRb, VD:/Y  
 protected: 4_?7&G0(  
  //{{AFX_MSG(CAboutDlg) 'fd1Pj9~$  
  //}}AFX_MSG $14:(<  
  DECLARE_MESSAGE_MAP() W6c]-pc  
}; B2=\2<  
pJIv+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a}yXC<}$  
{ g=@_Z"  
 //{{AFX_DATA_INIT(CAboutDlg) !RvRGRSyF  
 //}}AFX_DATA_INIT lEjwgk {  
} Pt,ebL~  
%r{3wH# D@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L:nXWz  
{ wucV_p.E  
 CDialog::DoDataExchange(pDX); *Nb#W!  
 //{{AFX_DATA_MAP(CAboutDlg) [tT8_}v$LN  
 //}}AFX_DATA_MAP LaFZ?7@|}  
} ] ,etZ%z&  
C)-^<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l: |D,q  
 //{{AFX_MSG_MAP(CAboutDlg) 1%[_`J;>Z  
 // No message handlers X@N$Z{  
 //}}AFX_MSG_MAP jyS=!ydn+  
END_MESSAGE_MAP() fK}h"iH+K  
-Yi,_#3{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) )Q;978:  
: CDialog(CCaptureDlg::IDD, pParent) M)-6T{[IT  
{ {2d_"lHBt  
 //{{AFX_DATA_INIT(CCaptureDlg) $RX'(/  
  m_bControl = FALSE; &n2e  
  m_bAlt = FALSE; "Y: /= Gx  
  m_bShift = FALSE; l~:v (R5  
  m_Path = _T("c:\\"); :fcM:w&  
  m_Number = _T("0 picture captured."); c,EBF\r8*  
  nCount=0; \/`?  
  bRegistered=FALSE; =JLh?Wx  
  bTray=FALSE; 2.uA|~qH  
 //}}AFX_DATA_INIT 1 k8x%5p  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Pz_Oe,{.I  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /lhz],w  
} }Nj97 R  
j1$8#/r;c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RF}X ER  
{ j-@kW'K  
 CDialog::DoDataExchange(pDX); +>^7vq-\'  
 //{{AFX_DATA_MAP(CCaptureDlg) ]w).8=I  
  DDX_Control(pDX, IDC_KEY, m_Key); vYmSKS  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -F/st  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BcWcdr+}9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `bI)<B  
  DDX_Text(pDX, IDC_PATH, m_Path); `1` f*d v  
  DDX_Text(pDX, IDC_NUMBER, m_Number); F4#g?R ::U  
 //}}AFX_DATA_MAP YB))S!;Ok  
} ^WYQ]@rh3  
QWnndI_4p  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R@ Y=o].2  
//{{AFX_MSG_MAP(CCaptureDlg) >u +q1j.  
 ON_WM_SYSCOMMAND() ZM#=`k9  
 ON_WM_PAINT() _m E^rT  
 ON_WM_QUERYDRAGICON() P@}Pk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2/P"7A=<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Et2JxbD  
 ON_BN_CLICKED(ID_CHANGE, OnChange) kTIYD o  
//}}AFX_MSG_MAP +%>:0mT  
END_MESSAGE_MAP() n^(A=G  
km5~Gc}  
BOOL CCaptureDlg::OnInitDialog() bKVj[r8D~  
{ %y[1H5)3<  
 CDialog::OnInitDialog(); A?!I/|E^;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7Ey#u4Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); j`*N,*ha  
 CMenu* pSysMenu = GetSystemMenu(FALSE); r{Rg920  
 if (pSysMenu != NULL) yTM3^R(  
 { {QaNAR=)  
  CString strAboutMenu; P,pnga3Wu  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <lxD}DH=  
  if (!strAboutMenu.IsEmpty()) sRHA."A!8  
  { n| O [a6G  
   pSysMenu->AppendMenu(MF_SEPARATOR); yqOuX>m1c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7^TV~E#  
  } Iry  
 } 4NR@u\S  
 SetIcon(m_hIcon, TRUE); // Set big icon G\gMC <3  
 SetIcon(m_hIcon, FALSE); // Set small icon /?-7Fg+,  
 m_Key.SetCurSel(0); 6R UrF  
 RegisterHotkey(); 34|a\b}  
 CMenu* pMenu=GetSystemMenu(FALSE); Gi6T["  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XkmQBV"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HjNxqaljt  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H4-qB Z'  
 return TRUE; // return TRUE unless you set the focus to a control Yd cK&{  
} er.L7  
al9.}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x<i}_@Sn_+  
{ {U!St@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z{NC9  
 { VObrlOkp  
  CAboutDlg dlgAbout; I8Vb-YeS  
  dlgAbout.DoModal(); <3X7T6_:@  
 } 9Mm!%Hu  
 else O%!5<8Xrb  
 { u'A#%}3  
  CDialog::OnSysCommand(nID, lParam); 9a$56GnW1  
 } {NM+Oj,~'  
} KGHq rc  
`em9T oJV  
void CCaptureDlg::OnPaint() SF ]@|  
{ 1M3% fW  
 if (IsIconic()) rEZ8eeB[3  
 { 5 LP?Ij  
  CPaintDC dc(this); // device context for painting [e e%c Xo  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cp Ear  
  // Center icon in client rectangle qAkx<u  
  int cxIcon = GetSystemMetrics(SM_CXICON); HG >j5  
  int cyIcon = GetSystemMetrics(SM_CYICON); wmr-}Y!9u%  
  CRect rect; u~zs* qp  
  GetClientRect(&rect); lb' Cl3H  
  int x = (rect.Width() - cxIcon + 1) / 2; F9q8SA#"  
  int y = (rect.Height() - cyIcon + 1) / 2; 7\ SUr9[  
  // Draw the icon DrW#v-d  
  dc.DrawIcon(x, y, m_hIcon); [|`U6 8}u  
 } 8 (jUe  
 else 4B+9z^oQ  
 { CDy^UQb  
  CDialog::OnPaint(); $WQq? 1.9  
 } !{^\1QK  
} oSb, :^Wl  
>n5:1.g  
HCURSOR CCaptureDlg::OnQueryDragIcon() xh@-g|+g  
{ eBN)g^  
 return (HCURSOR) m_hIcon; g\oSG)  
} 3#kitmV  
"v*8_El  
void CCaptureDlg::OnCancel() L}{`h  
{ \Xrw"\")j  
 if(bTray) k5d\ w@G"~  
  DeleteIcon(); J<n+\F-s  
  CDialog::OnCancel(); ;+"f  
} LS>G4 ]  
wgeNs9L  
void CCaptureDlg::OnAbout() pj|pcv^  
{ >:sUL<p  
 CAboutDlg dlg; s'P( ,!f  
 dlg.DoModal(); X+8B!F  
} |tMn={  
T".]m7!  
void CCaptureDlg::OnBrowse() DLPUqKL]  
{ +';>=hha  
 CString str; "L"150Ih  
 BROWSEINFO bi; Z5G!ct:W  
 char name[MAX_PATH]; kQdt}o])  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); wz8PtfZ  
 bi.hwndOwner=GetSafeHwnd(); }$su4A@0  
 bi.pszDisplayName=name; y k161\  
 bi.lpszTitle="Select folder"; vy@rQC %9  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %n0;[sD0A  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #>;FUZuJr  
 if(idl==NULL) ]J1S#Q5'  
  return; ig"uXs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d=.2@Ry  
 str.ReleaseBuffer(); 8am`6;O:!  
 m_Path=str; e>'H IO  
 if(str.GetAt(str.GetLength()-1)!='\\') ^u)z{.z'H/  
  m_Path+="\\"; qf'm=efRyu  
 UpdateData(FALSE); 5@osnf?  
} {WN(&eax  
[ANuBNF  
void CCaptureDlg::SaveBmp() 46jh-4) <  
{ RH)EB<PV  
 CDC dc; s3s4OAY  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); hi =XYC,  
 CBitmap bm; }SyxPXs  
 int Width=GetSystemMetrics(SM_CXSCREEN); fCAiLkT,C[  
 int Height=GetSystemMetrics(SM_CYSCREEN); }H:F< z*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z|R,&~:  
 CDC tdc; S|AM9*k9  
 tdc.CreateCompatibleDC(&dc); "pxzntY|  
 CBitmap*pOld=tdc.SelectObject(&bm); &YP#M |  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); USJ- e  
 tdc.SelectObject(pOld); D bX{#4lx  
 BITMAP btm; l kIn%=Z  
 bm.GetBitmap(&btm); z5\;OLJS,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `XTh1Z\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Upl6:xYrG  
 BITMAPINFOHEADER bih;  /RZR}  
 bih.biBitCount=btm.bmBitsPixel; fr6^nDY  
 bih.biClrImportant=0; _Yb _D/  
 bih.biClrUsed=0; ~0"p*?^  
 bih.biCompression=0; iItcN;;7  
 bih.biHeight=btm.bmHeight; q*jNH\|  
 bih.biPlanes=1; c{ZY,C&<  
 bih.biSize=sizeof(BITMAPINFOHEADER); #PvB/3  
 bih.biSizeImage=size; Q3W#`6jpF  
 bih.biWidth=btm.bmWidth; aAvsb$  
 bih.biXPelsPerMeter=0; 4wzlJ19E(  
 bih.biYPelsPerMeter=0; ;E2>Ovv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); YEu1#N  
 static int filecount=0; [t\B6XxT  
 CString name; }n,Zl>T9  
 name.Format("pict%04d.bmp",filecount++); :!&;p  
 name=m_Path+name; qMBR *f  
 BITMAPFILEHEADER bfh; l|`9:H  
 bfh.bfReserved1=bfh.bfReserved2=0; XK(`mEi  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +KGZ HO!  
 bfh.bfSize=54+size; =]R3& ]#n  
 bfh.bfOffBits=54; 0X2@CPIFf  
 CFile bf; MWk:sBCqr  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;#GoGb4AM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); jd`},X/  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); tL SN`6[:  
  bf.WriteHuge(lpData,size); X8eJ4%  
  bf.Close(); A?Qa 4i  
  nCount++; 3q[WHwmm  
 } W|k0R4K]]  
 GlobalFreePtr(lpData); ajl 2I/D  
 if(nCount==1) ChryJRuwv5  
  m_Number.Format("%d picture captured.",nCount); hlZ@Dq%f  
 else _;A $C(  
  m_Number.Format("%d pictures captured.",nCount); ?eV(1 Fr@  
  UpdateData(FALSE); _STB$cZ  
} [ //R~i?  
V+-$ jOh  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) < |O^>s;  
{ PALl sGlf  
 if(pMsg -> message == WM_KEYDOWN) gQSNU_o Z  
 { Vpfp}pL  
  if(pMsg -> wParam == VK_ESCAPE) #BK9 k>i  
   return TRUE; _?7#MWe&  
  if(pMsg -> wParam == VK_RETURN) C9n}6Er=,  
   return TRUE; jt~Qu-  
 } 5pNY)>]t=  
 return CDialog::PreTranslateMessage(pMsg); "bg'@:4F  
} g3@Rl2yQJ  
3b'tx!tFN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M_ 0zC1  
{ 1xNVdI   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :R6bq!  
  SaveBmp(); ^_I} x)i*@  
  return FALSE; bok.j  
} <BWkUZz\P|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pZZgIw}aS  
 CMenu pop; L gmvKW|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z9 u$~  
 CMenu*pMenu=pop.GetSubMenu(0); qVjWV$j  
 pMenu->SetDefaultItem(ID_EXITICON); sH,kW|D  
 CPoint pt; /z7VNkD  
 GetCursorPos(&pt); m4k Bj*6c{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gV1[3dW  
 if(id==ID_EXITICON) ^da44Qqu  
  DeleteIcon(); &Wp8u#4L  
 else if(id==ID_EXIT) +^aFs S  
  OnCancel(); $VG*q  
 return FALSE; B(k=oXDF  
} wmNHT _  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Yw3oJf&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |9xI_(+{kP  
 AddIcon(); `i ,_aFB|  
 return res; )|j[uh6w o  
} v4Zb? Yb  
mN `YuR~  
void CCaptureDlg::AddIcon() P47V:E%  
{ @ufo$?D  
 NOTIFYICONDATA data; [@ <sFP;g  
 data.cbSize=sizeof(NOTIFYICONDATA); TjWE_Bq]g  
 CString tip; DVZdClAL  
 tip.LoadString(IDS_ICONTIP); >!e<}84b  
 data.hIcon=GetIcon(0); c97{Pu  
 data.hWnd=GetSafeHwnd(); 148V2H)  
 strcpy(data.szTip,tip); ?[TfpAtQ`  
 data.uCallbackMessage=IDM_SHELL; dCYCHHHF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9A,Z|q/z5  
 data.uID=98; dBsX*}C  
 Shell_NotifyIcon(NIM_ADD,&data); h[KvhbD3   
 ShowWindow(SW_HIDE); uy_wp^  
 bTray=TRUE; cxeghy:;U  
} 3:/'t{ ^B  
oq/G`{`\  
void CCaptureDlg::DeleteIcon() gC%G;-gm  
{ Agh`]XQ2  
 NOTIFYICONDATA data; 4nfu6Dq  
 data.cbSize=sizeof(NOTIFYICONDATA); h<<>3A  
 data.hWnd=GetSafeHwnd(); # m R4fst  
 data.uID=98; Mk<Vydds  
 Shell_NotifyIcon(NIM_DELETE,&data); lLq<xf  
 ShowWindow(SW_SHOW); dhg~$CVO  
 SetForegroundWindow(); #TK~eHi  
 ShowWindow(SW_SHOWNORMAL); BC>=B@H0  
 bTray=FALSE; i=a-<A5x  
} {yAL+}  
wCs^J48=  
void CCaptureDlg::OnChange() Th[f9H%  
{ Bm$"WbOq*R  
 RegisterHotkey(); 5  *}R$  
} &ad I (s~  
d9*hBm  
BOOL CCaptureDlg::RegisterHotkey() <>eOC9;VY  
{ KT|RF  
 UpdateData(); mpC`Yk  
 UCHAR mask=0; }uHrto3M  
 UCHAR key=0; iF5'ygR-Z  
 if(m_bControl) c:S] R"  
  mask|=4; W+wA_s2&D  
 if(m_bAlt) 5V[oE\B  
  mask|=2; 2=0DCF;Bv  
 if(m_bShift) +[@z(N-h  
  mask|=1; j| Wv7  
  key=Key_Table[m_Key.GetCurSel()]; @53k8  
 if(bRegistered){ [u@Jc,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z 2}ah  
  bRegistered=FALSE; <tpmUA[]  
 } 'crlA~&#/  
 cMask=mask; c5q9 LQ/  
 cKey=key; 5wB =>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [L`ZE*z  
 return bRegistered; 0C<[9Dl.G8  
} M}:=zcZ l  
+;BAV  
  四、小结 exh/CK4;  
_LP/!D  
  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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