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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: #<yKG\X?  
   8s>OO&  
  一、实现方法 %RXFgm!{f  
J pKCux  
  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: j\2q2_f  
Env_??xq  
#pragma data_seg("shareddata") yVH>Q-{  
HHOOK hHook =NULL; //钩子句柄 ~4M?[E&  
UINT nHookCount =0; //挂接的程序数目 lfte   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g>-u9%aa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Q&e*[l2M6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey y@\J7 h:  
static int KeyCount =0;  nw  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 :tX,`G  
#pragma data_seg() A'T: \Wl  
pt~b=+bBm  
  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。 #LfoG?k1K  
|%fM*F^7/  
  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: `<* tp@  
S3?U-R^`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :xsNn55b  
cKey,UCHAR cMask) ? 9;r|G  
{ }RZN3U=  
 BOOL bAdded=FALSE; bw OG|\  
 for(int index=0;index<MAX_KEY;index++){ u-HBmL  
  if(hCallWnd[index]==0){ U$j?2|v-x  
   hCallWnd[index]=hWnd; =yLJGNK[  
   HotKey[index]=cKey; ]c\d][R N  
   HotKeyMask[index]=cMask; (?lKedA>2  
   bAdded=TRUE; j xTYW)E   
   KeyCount++; !7jVKI80  
   break; xBg. QV  
  } ^Bu55q  
 } N=~aj7B%  
 return bAdded; 52#Ac;Y  
} B):hm  
//删除热键 DBk]2W|i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j/uu&\e  
{ 5;q{9wvqO  
 BOOL bRemoved=FALSE; #0'%51Jcl  
 for(int index=0;index<MAX_KEY;index++){ ;cp,d~mrf  
  if(hCallWnd[index]==hWnd){ H/N4t Wk"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %)p?&_  
    hCallWnd[index]=NULL; <zt124y-6  
    HotKey[index]=0; ;T*o RS  
    HotKeyMask[index]=0; B`wrr8"Rz  
    bRemoved=TRUE; %2^wyVkq:  
    KeyCount--;  95l)w  
    break; Sgq?r-Q.  
   } vfloha p  
  } YG J)_y  
 } u?I2|}#  
 return bRemoved; (qdvvu#E  
} osZ] R  
XN}^:j_2  
`/JuItL-  
  DLL中的钩子函数如下: V?&P).5)  
hD9b2KZv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MZ"|Jn  
{ +a0` ,Jc  
 BOOL bProcessed=FALSE; W.Z`kH *B  
 if(HC_ACTION==nCode) _kT{W]   
 { X}B ]0z>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 tQ(4UHqa~  
   switch(wParam)  4}F~h  
   {  qrufnu5cC  
    case VK_MENU: qB5.of[N!  
     MaskBits&=~ALTBIT; ]-cSTtO  
     break; +0g L!r  
    case VK_CONTROL: ' wni.E&  
     MaskBits&=~CTRLBIT; fi  [4F  
     break; #*X\pjZ  
    case VK_SHIFT: odWK\e  
     MaskBits&=~SHIFTBIT; y_r(06"z1  
     break; |H.ARLS  
    default: //judge the key and send message A\<W x/  
     break; IPf>9#L  
   } .I.B,wH8  
   for(int index=0;index<MAX_KEY;index++){ *" +u^  
    if(hCallWnd[index]==NULL) GQ2/3kt  
     continue; u6SQq-)d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '^M.;Giz  
    { ZlP+t>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XIn,nCY;  
     bProcessed=TRUE; -ARks_\  
    } 9_fbl:qk;\  
   } ;Vpp1mk|  
  } VS@e[,  
  else if((lParam&0xc000ffff)==1){ //有键按下 &%m%b5  
   switch(wParam) [Qcht,\^v  
   { Q89fXi0Ivb  
    case VK_MENU: 6ZfL-E{  
     MaskBits|=ALTBIT; )Z)Gb~G  
     break; Kc, i$FH  
    case VK_CONTROL: Whe-()pG{  
     MaskBits|=CTRLBIT; l=ZD&uK  
     break; KwU;+=_.  
    case VK_SHIFT: aa" 3 Io  
     MaskBits|=SHIFTBIT; :Iuc H%6V  
     break; E+lr{~  
    default: //judge the key and send message M.+h3<%^  
     break; <w`EU[y_  
   } U~USwUzgY  
   for(int index=0;index<MAX_KEY;index++){ uVTacN%X  
    if(hCallWnd[index]==NULL) hZlHY9[t?  
     continue; i%[+C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `]^W#6l  
    { L9-Jwy2(>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); IqiU  
     bProcessed=TRUE; qsQ{`E0  
    } @dx 8{oQ  
   } %z=:P{0UQ  
  } ` FOCX;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 *V4%&&{  
   for(int index=0;index<MAX_KEY;index++){ `!$6F:d_l  
    if(hCallWnd[index]==NULL) Lq;T\m_de  
     continue; zXD/hM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M\-[C!h,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); eL~3CAV{  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (Ldvx_  
   } uVKe?~RC  
  } ="v`W'Pd  
 } (Gw*x sn1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Np%Q-T\  
} 7e\Jg/FU  
DP0@x+`k  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ~M8|r!_  
IT{c:jo1{`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @_?2iN?4Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hi$R"O (  
L9N }lH  
  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: ;mT}Q;F#  
g$^-WmX\m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A]TEs)#*7)  
{ !y B4;f$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KE ?NQMU  
 { pS |K[:5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )obgEJ7Y`l  
  SaveBmp(); '(rD8 pc  
  return FALSE; `FQ]ad Fz  
 } f}"eN/T  
 …… //其它处理及默认处理 g4b#U\D@)/  
} 4>i\r  
|Q%P4S"B?  
/'aqQ K<  
  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。 '~Cn+xf4]  
+Wg/ O -  
  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。 C1e@{>  
|Z94@uB  
  二、编程步骤 51b%uz  
cz1+ XpU  
  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"; '(FC  
Qv5 fK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g i6s+2  
8T9 s:/%  
  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; mjWU0.  
s{R ,- \_  
  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; 6ICW>#fI`  
!5(DU~S*@S  
  5、 添加代码,编译运行程序。 Hp04apM:  
J)Y`G4l2@  
三、程序代码 R%RxF=@  
V%s7*`U  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (87| :{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) PVp>L*|BZ;  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I2WP/  
#if _MSC_VER > 1000 6T'UWh0S  
#pragma once 'k[qx}  
#endif // _MSC_VER > 1000 pQBn8H|Y  
#ifndef __AFXWIN_H__ =Q40]>bpx  
#error include 'stdafx.h' before including this file for PCH qWheoyAB  
#endif 0|Fx Sc  
#include "resource.h" // main symbols =yZq]g6Q  
class CHookApp : public CWinApp IZj`*M%3  
{ V^ n6~O  
 public: N'VTdf?  
  CHookApp(); P.XT1)qo*  
  // Overrides L? DlR hu  
  // ClassWizard generated virtual function overrides Cjr]l!  
  //{{AFX_VIRTUAL(CHookApp) H]R/=OYBUh  
 public: 0fXMY-$I  
  virtual BOOL InitInstance(); i`2SebDj'w  
  virtual int ExitInstance(); `^SRg_rH=`  
  //}}AFX_VIRTUAL !vAmjjB  
  //{{AFX_MSG(CHookApp) HK/WO jr  
  // NOTE - the ClassWizard will add and remove member functions here. "jum*<QZz  
  // DO NOT EDIT what you see in these blocks of generated code ! y|ZL< L  
  //}}AFX_MSG Fn@`Bi?#q  
  DECLARE_MESSAGE_MAP() =|z:wlOs  
}; ~Mn3ADIb=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q k^FyZ<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6XWNJb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +_7a/3kh  
BOOL InitHotkey(); h5'hP>b#  
BOOL UnInit(); adP  :{j  
#endif !{.CGpS ]  
/>S^`KSTM  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7?=^0?a  
#include "stdafx.h" tRdf:F\X  
#include "hook.h" JLE&nbKS  
#include <windowsx.h> WT ;2aS:  
#ifdef _DEBUG %LMpErZO  
#define new DEBUG_NEW "V>}-G&  
#undef THIS_FILE =tP9n;D  
static char THIS_FILE[] = __FILE__; 6#+&/ "*  
#endif K|Sq_/#+U  
#define MAX_KEY 100 M4C8K{}  
#define CTRLBIT 0x04 (lM,'  
#define ALTBIT 0x02 D!o[Sm}JO[  
#define SHIFTBIT 0x01 5)%ahmY  
#pragma data_seg("shareddata") *2X~NJCt  
HHOOK hHook =NULL; @-)?uYw:r  
UINT nHookCount =0; !vgY3S0?rq  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [;z\bV<S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Z0L($  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 27D*FItc  
static int KeyCount =0; U.<j2K um  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %VO+\L8Fs  
#pragma data_seg() "#O9ij  
HINSTANCE hins; Nbpn"*L,  
void VerifyWindow(); $t;:"i>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #%;Uh  
//{{AFX_MSG_MAP(CHookApp) #BLHHK/[  
// NOTE - the ClassWizard will add and remove mapping macros here. ;l*%IMB  
// DO NOT EDIT what you see in these blocks of generated code! ST?{H SCz  
//}}AFX_MSG_MAP RK!9(^Ja  
END_MESSAGE_MAP() dS6 $  
|0i{z(B  
CHookApp::CHookApp() s>J5.Z7"'j  
{ z{W C w  
 // TODO: add construction code here, yI: ;+K  
 // Place all significant initialization in InitInstance h< r(:.%!}  
} WA (x]""  
;A,X,f  
CHookApp theApp; n2mO-ZXud  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Gm B&TD m  
{ b  Ssg`  
 BOOL bProcessed=FALSE; x:FZEyalG  
 if(HC_ACTION==nCode) * 1;4&/93o  
 { oy8jc];SO  
  if((lParam&0xc0000000)==0xc0000000){// Key up Q6HJ+H-Ub  
   switch(wParam) ,H{9`a#+:  
   { kGV:=h  
    case VK_MENU: R&Lqaek&W  
     MaskBits&=~ALTBIT; # sw4)*v  
     break; 5pJe`}O4  
    case VK_CONTROL: $+Ze"E  
     MaskBits&=~CTRLBIT; @}4aF|  
     break; WLl8oE< X  
    case VK_SHIFT: SZKYq8ZA)V  
     MaskBits&=~SHIFTBIT; =cEsv&i  
     break; 9f! M1  
    default: //judge the key and send message F}}!e.>c  
     break; e\V -L_  
   } a$=~1@  
   for(int index=0;index<MAX_KEY;index++){ hW#^H5?  
    if(hCallWnd[index]==NULL) u!K1K3T6k  
     continue; NBPP?\1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /JS_gr@DK  
    { u#Ig!7iUu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U823q-x  
     bProcessed=TRUE;  8oJl ]  
    } ,ucRQ&P  
   } E]' f&0s  
  } "9_$7.q<y  
  else if((lParam&0xc000ffff)==1){ //Key down I!L J&>  
   switch(wParam) ?0; 2ct  
   { IAQ<|3Q  
    case VK_MENU: -Rpra0o. C  
     MaskBits|=ALTBIT; /wLBmh1"  
     break; ]Kt@F0U<o  
    case VK_CONTROL: NA0nF8ek  
     MaskBits|=CTRLBIT; PZ|I3z  
     break; |*c1S -#  
    case VK_SHIFT: bny5e:= d  
     MaskBits|=SHIFTBIT; pWxk^qhe/  
     break; z6R|1L 1  
    default: //judge the key and send message jC'h54 ,Mr  
     break; {IgH0+z  
   } 'V?FeWp  
   for(int index=0;index<MAX_KEY;index++) UfX~GC;B  
   { -zFJ)!/?  
    if(hCallWnd[index]==NULL) DKj iooD  
     continue; %C/p+Tg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I(*3n"  
    { Q'n+K5&p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gkd4)\9  
     bProcessed=TRUE; %'1iT!g8  
    } Tow=B  
   } Q` &#u#  
  } 3Z" ;a  
  if(!bProcessed){ &<;T$Y  
   for(int index=0;index<MAX_KEY;index++){ )Jjp^U3Ub  
    if(hCallWnd[index]==NULL) B/;> v  
     continue; tBGLEeL/.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 84WD R?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v^ ^Ibv  
   } sbmtx/%U  
  } 486\a  
 } YIRe__7-NU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vcFR Td  
} c K\   
L ?/AKg  
BOOL InitHotkey() 6-|?ya  
{ >pp/4Ia!  
 if(hHook!=NULL){ kf'(u..G  
  nHookCount++; {N}az"T4f  
  return TRUE; g8.z?Ia#5Z  
 } SEM?vQ 0"}  
 else 08xo_Oysq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]R""L<K%HF  
  if(hHook!=NULL) w(V%EEk  
   nHookCount++; )vO"S  
  return (hHook!=NULL); ,y]-z8J  
} 2"G9?)d9  
BOOL UnInit() R%szN.cI  
{ NWn*_@7;  
 if(nHookCount>1){ b@CjnAZ  
  nHookCount--; :"Xnu%1  
  return TRUE; f!kZyD7  
 } nx%As  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "BT M,CB  
 if(unhooked==TRUE){ = z mxki  
  nHookCount=0; x[lIib1s  
  hHook=NULL; rY(7IX  
 } Q &W>h/  
 return unhooked; M ]047W  
} /!0&b?  
%j^QK>%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A@>/PB6n  
{ +A8q.-N G  
 BOOL bAdded=FALSE; t)j$lmQn  
 for(int index=0;index<MAX_KEY;index++){ 4}DFCF%B  
  if(hCallWnd[index]==0){ A4,%l\di<  
   hCallWnd[index]=hWnd; #~'d Y\&  
   HotKey[index]=cKey; d(|?gN^  
   HotKeyMask[index]=cMask; wKi#5k2  
   bAdded=TRUE; 2n3&uvf'TL  
   KeyCount++; SLEOc OAmD  
   break; Tl yyJ{~  
  } L|WrdT D;  
 } Y\WQ0'y  
 return bAdded; K9ia|2f  
} Q>4NUq  
EeMKo  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jywS<9c@  
{ k}:;`ST  
 BOOL bRemoved=FALSE; Rw `ezC#  
 for(int index=0;index<MAX_KEY;index++){ "y~*1kBu  
  if(hCallWnd[index]==hWnd){ i tNuY<"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ gw"SKp!]  
    hCallWnd[index]=NULL; 0V-jOc  
    HotKey[index]=0; 1|8Bv0-b  
    HotKeyMask[index]=0; kttJTP77t  
    bRemoved=TRUE;  \xp0n  
    KeyCount--; e 1XKlgl  
    break; I`oJOLV  
   } =c \(]xX  
  } %Qz<Lk">.  
 } y@v)kN)Y9\  
 return bRemoved; @+t|Aa^g  
} Fc[vs52  
517"x@6Q  
void VerifyWindow() '^m'r+B"  
{ FVkl# Qy~  
 for(int i=0;i<MAX_KEY;i++){ ?@PSD\  
  if(hCallWnd!=NULL){ |pZ7k#%  
   if(!IsWindow(hCallWnd)){ <w}^Z}fpk&  
    hCallWnd=NULL; UH0l8ixc  
    HotKey=0; j5R0e}/r  
    HotKeyMask=0; B.4e4%BBS  
    KeyCount--; [xY-=-T*4  
   } 7]Qxt%7/>  
  } (KN",u6F  
 } l"[.Q>d  
} K:-jn}i?/  
_)<5c!  
BOOL CHookApp::InitInstance() p=UW ^95  
{ BZhf/{h[@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /,uxj5_cT  
 hins=AfxGetInstanceHandle(); b=BNbmX  
 InitHotkey(); WFc4(Kl  
 return CWinApp::InitInstance(); H0tu3Pqk  
} CR.d3!&28  
^L.I9a#]  
int CHookApp::ExitInstance() O[$X36z  
{ }@6yROy.  
 VerifyWindow(); |1 qrU(  
 UnInit(); y|B HSc3  
 return CWinApp::ExitInstance(); 9$U>St  
} J ?aJa  
Zjn1,\(t~u  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Cp!9 "J:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  *`qI<]!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X ]&`"Z]  
#if _MSC_VER > 1000 n%\\1  
#pragma once f%_$RdU  
#endif // _MSC_VER > 1000 XFs7kTY  
B!`.,3  
class CCaptureDlg : public CDialog 'HfI~wN  
{ ER-Xd9R  
 // Construction  w<!&%  
 public: GCQOjqiR  
  BOOL bTray; jJYCGK$=  
  BOOL bRegistered; 1$# r)S[*  
  BOOL RegisterHotkey(); ;j;U9-oh  
  UCHAR cKey; Z>w@3$\z  
  UCHAR cMask; $B>L_~cS  
  void DeleteIcon(); HW_2!t_R  
  void AddIcon(); sX>|Y3S\U  
  UINT nCount; Q$'\_zV  
  void SaveBmp(); ;>>:7rdYt  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M{u7Ef  
  // Dialog Data u-n$%yDS  
  //{{AFX_DATA(CCaptureDlg) R(y`dQy<K  
  enum { IDD = IDD_CAPTURE_DIALOG }; nf _(_O=  
  CComboBox m_Key; s#0m  
  BOOL m_bControl; |C+ 5  
  BOOL m_bAlt; -"^"& )  
  BOOL m_bShift; #/`MYh=!W  
  CString m_Path; b0%#=KMi  
  CString m_Number; WV|9d}5  
  //}}AFX_DATA 9p02K@wkD  
  // ClassWizard generated virtual function overrides _fj@40i M  
  //{{AFX_VIRTUAL(CCaptureDlg) [daR)C  
 public: aeLIs SEx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {[H#lX 4  
 protected: TxkvHiq2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }?GeU Xhy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UU =,Brb  
  //}}AFX_VIRTUAL /oM&29 jy  
  // Implementation W89J]#v)k  
 protected: 7V\M)r{q7  
  HICON m_hIcon; b$Bq#vdg:  
  // Generated message map functions 5= MM^$QG  
  //{{AFX_MSG(CCaptureDlg) %s%e5hU  
  virtual BOOL OnInitDialog(); ).C>>1ZC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7x |Pgu(  
  afx_msg void OnPaint(); !G ~\9  
  afx_msg HCURSOR OnQueryDragIcon(); <l9qhqHv&  
  virtual void OnCancel(); IP 1{gMG  
  afx_msg void OnAbout(); 8=sMmpB 7u  
  afx_msg void OnBrowse(); i6h0_q8 >  
  afx_msg void OnChange(); zgpv I~Ck  
 //}}AFX_MSG c*> SZ'T\  
 DECLARE_MESSAGE_MAP() }W]k1Bsx  
}; 3o__tU)B  
#endif v[ y|E;B  
^yF2xJ)9-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file '-X913eG!  
#include "stdafx.h" g!;Hv  
#include "Capture.h" ;%i.@@:IQ  
#include "CaptureDlg.h" b9Ix*!Y  
#include <windowsx.h> +@oo8io  
#pragma comment(lib,"hook.lib") Uefw  
#ifdef _DEBUG 0l%|2}a  
#define new DEBUG_NEW F a'2i<  
#undef THIS_FILE /`VtW$9-  
static char THIS_FILE[] = __FILE__; .l&<-l;UQ  
#endif !g-19at  
#define IDM_SHELL WM_USER+1 W>7o ec  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fL1EQ)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J $<g" z3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xSHeP`P^X  
class CAboutDlg : public CDialog F{aM6I  
{ AfW9;{j&I  
 public: ?l<u%o  
  CAboutDlg();  hG!"e4  
  // Dialog Data vN4g#,<  
  //{{AFX_DATA(CAboutDlg) 7[ra#>e8'  
  enum { IDD = IDD_ABOUTBOX }; @=[ SsS  
  //}}AFX_DATA FPPGf!Eq  
  // ClassWizard generated virtual function overrides wMB<^zZmv  
  //{{AFX_VIRTUAL(CAboutDlg) *m sW4|=^2  
 protected: ~FV Z0%+,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vb.`rj6  
  //}}AFX_VIRTUAL Gv}h/zu-  
  // Implementation DNaU mz  
 protected: pJ#R :#P  
  //{{AFX_MSG(CAboutDlg) ^25[%aJI  
  //}}AFX_MSG B6b {hsO  
  DECLARE_MESSAGE_MAP() `QlChxd  
}; $u9y H Z  
{ O*maE"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) vF K&.J  
{ ZIx,?E+eJ  
 //{{AFX_DATA_INIT(CAboutDlg) (k..ll p~  
 //}}AFX_DATA_INIT +'x`rk  
} &4yI]  
)*iSN*T8q  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;o#R(m@Lx  
{ zRJopcE<  
 CDialog::DoDataExchange(pDX); iCIu]6  
 //{{AFX_DATA_MAP(CAboutDlg) @&]j[if (s  
 //}}AFX_DATA_MAP j%KLp4J/e  
} 16YJQ ue  
@W^A%6"j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) y@G5I>v  
 //{{AFX_MSG_MAP(CAboutDlg) D;|4ZjM-  
 // No message handlers -C5Qh&~W  
 //}}AFX_MSG_MAP w8(qiU  
END_MESSAGE_MAP() Kl$!_$  
c|Nv^V*2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;#!`c gAh  
: CDialog(CCaptureDlg::IDD, pParent) +aV>$Y  
{ 3e:"tus~  
 //{{AFX_DATA_INIT(CCaptureDlg) 5_nkN`x  
  m_bControl = FALSE; [Qv%  
  m_bAlt = FALSE; LeY\{w  
  m_bShift = FALSE; Sg0 _l(  
  m_Path = _T("c:\\"); }$;T.[ ~  
  m_Number = _T("0 picture captured."); ^c^9kK'  
  nCount=0; -rlxxLT+  
  bRegistered=FALSE; !o&Mw:d  
  bTray=FALSE; ~^IS{1  
 //}}AFX_DATA_INIT j+J)S1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 C 9,p-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w=3@IW  
} >OwVNG  
HH2*12e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W9Bl'e  
{ ;vF8V`f   
 CDialog::DoDataExchange(pDX); }O@S ;[v S  
 //{{AFX_DATA_MAP(CCaptureDlg) lb&tAl"D  
  DDX_Control(pDX, IDC_KEY, m_Key); W==HV0n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); FcsEv {#U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); kte Dh7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @ MNL  
  DDX_Text(pDX, IDC_PATH, m_Path); g^ ^%4Y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); b2H!{a"  
 //}}AFX_DATA_MAP Y+V*$73`  
} 1?)<*[  
<k5FlvE2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hn.9j"  
//{{AFX_MSG_MAP(CCaptureDlg) ,u{d@U^)3@  
 ON_WM_SYSCOMMAND() rc*&K#? B  
 ON_WM_PAINT() '9*wr*  
 ON_WM_QUERYDRAGICON() \h :Rw|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Xe*@`&nv@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L1Fn;nR  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e&7GW9FSg  
//}}AFX_MSG_MAP LZM[Wg#  
END_MESSAGE_MAP() o]MQ)\ r  
phbdV8$L  
BOOL CCaptureDlg::OnInitDialog() hof$0Fg  
{ 5 & -fX:/  
 CDialog::OnInitDialog(); A,lcR:@w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); gO4J[_  
 ASSERT(IDM_ABOUTBOX < 0xF000); \?GUGs  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .-`7Av+7  
 if (pSysMenu != NULL) W8yr06{]  
 { 8 8pz<$  
  CString strAboutMenu; cpFw]w%]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &>@nW!n u  
  if (!strAboutMenu.IsEmpty()) //Hn[wEOh  
  { mmTc.x h  
   pSysMenu->AppendMenu(MF_SEPARATOR); TxN#3m?G  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); > g8;x#  
  } Si6%6rAhj  
 } 5U3="L  
 SetIcon(m_hIcon, TRUE); // Set big icon }3lM+]pf  
 SetIcon(m_hIcon, FALSE); // Set small icon n9t8RcJS:  
 m_Key.SetCurSel(0); "] kaaF$U%  
 RegisterHotkey(); sUfH1w)0  
 CMenu* pMenu=GetSystemMenu(FALSE); A37Z;/H~k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); O#Xq0o  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T9RR. ng  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); jf*M}Q1jHE  
 return TRUE; // return TRUE unless you set the focus to a control G5"UhnOD'  
} w;}P<K  
.9lx@6]+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9d#-;qV  
{ u{ JAC!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Xy_+L_h^  
 { wcsUb 9(  
  CAboutDlg dlgAbout; ysGK5kFz  
  dlgAbout.DoModal(); O6Xu/X]  
 } mAk)9`f/  
 else e DX{}Dq(  
 { ^Ml)g=Fq  
  CDialog::OnSysCommand(nID, lParam); tP"C >#LO  
 } p r(:99~3  
} (/v(.t  
5``/exG>  
void CCaptureDlg::OnPaint() w/~,mzM"  
{ -PB m@}*  
 if (IsIconic()) \gDf&I  
 { ,wlF n  
  CPaintDC dc(this); // device context for painting c,!Ijn\;(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X4Q ?]{  
  // Center icon in client rectangle pu0IhDMn  
  int cxIcon = GetSystemMetrics(SM_CXICON); x: `oqbd  
  int cyIcon = GetSystemMetrics(SM_CYICON); ] RN&s  
  CRect rect; Cc$!TZq=  
  GetClientRect(&rect); fp.,MIS  
  int x = (rect.Width() - cxIcon + 1) / 2; Owo2DsT t  
  int y = (rect.Height() - cyIcon + 1) / 2; eL0U5>#  
  // Draw the icon k9~NIvnB`  
  dc.DrawIcon(x, y, m_hIcon); W[AX?  
 } |b QKymS  
 else u+&BR1)C  
 { )%-FnW  
  CDialog::OnPaint(); K;k_MA310  
 } E<:XHjm  
} Q0#oR [(  
V\W?@V9g-  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?S~HnIn  
{ I+ rHb< P%  
 return (HCURSOR) m_hIcon; P%8 Gaa=  
} P6u9Ngay  
='`z  
void CCaptureDlg::OnCancel() ZNuz%VO  
{ xdFm-_\-  
 if(bTray) yH|[K=?S[  
  DeleteIcon();  "_eHK#)  
  CDialog::OnCancel(); ^HgQ"dD <  
} f*,jhJ_I  
oM G8?p  
void CCaptureDlg::OnAbout() |L}zB,  
{ ~Z9Eb|B  
 CAboutDlg dlg; 4zkn~oy  
 dlg.DoModal(); i ?&t@"'  
} ![h+ R@_(  
5%BexIk  
void CCaptureDlg::OnBrowse() cXU8}>qY7  
{ O-J;iX}  
 CString str; 3=5K7 F  
 BROWSEINFO bi; DDxbIkt  
 char name[MAX_PATH]; '3TwrY?-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); F/pq9  
 bi.hwndOwner=GetSafeHwnd(); z<_&4)2{  
 bi.pszDisplayName=name; )6+Z99w  
 bi.lpszTitle="Select folder"; ~[8n+p+&X  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; UY>[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); pbCj ^  
 if(idl==NULL) mJxr"cwHl  
  return; ;X_bDiG$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); m:}PVJ-"  
 str.ReleaseBuffer(); )Ehi 8  
 m_Path=str; (Q5rOrA"  
 if(str.GetAt(str.GetLength()-1)!='\\') fe!eZiE  
  m_Path+="\\"; ~];r{IU  
 UpdateData(FALSE); m+UWvUB)  
} jz,K>   
A<h^.{  
void CCaptureDlg::SaveBmp() 18^#:=Z  
{ O]4v\~@-j  
 CDC dc; D`|8Og  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kzE<Y  
 CBitmap bm; NX[-Y]t  
 int Width=GetSystemMetrics(SM_CXSCREEN); U[0x\~[$K  
 int Height=GetSystemMetrics(SM_CYSCREEN); -Oi8]Xw^@y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~dO+kD  
 CDC tdc; lRk_<A  
 tdc.CreateCompatibleDC(&dc); 3"BSP3/ [l  
 CBitmap*pOld=tdc.SelectObject(&bm); MzFFWk  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YpOcLxFL  
 tdc.SelectObject(pOld); 9 NGKh3V  
 BITMAP btm; $:?Dyu(Il  
 bm.GetBitmap(&btm); KuRJo]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; eMV{rFmT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >'lvZt  
 BITMAPINFOHEADER bih; L6?~<#-m\M  
 bih.biBitCount=btm.bmBitsPixel; T@Bu Fr`]<  
 bih.biClrImportant=0; f,|g|&C  
 bih.biClrUsed=0; <{+U- ^rzR  
 bih.biCompression=0; M }! qH.W  
 bih.biHeight=btm.bmHeight; CnpQdI  
 bih.biPlanes=1; 1{ H=The  
 bih.biSize=sizeof(BITMAPINFOHEADER); zviTGhA  
 bih.biSizeImage=size; `;=-71Gn~  
 bih.biWidth=btm.bmWidth; fikDpR  
 bih.biXPelsPerMeter=0; ;reBJk  
 bih.biYPelsPerMeter=0; ddS3;Rk2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); SiYH@Wma  
 static int filecount=0; =H`yzGt  
 CString name; abAw#XQ8  
 name.Format("pict%04d.bmp",filecount++); nC%<BatQ  
 name=m_Path+name; gyQPQ;"H$2  
 BITMAPFILEHEADER bfh; <PFF\NE9  
 bfh.bfReserved1=bfh.bfReserved2=0; Q #X'.](1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); MgP&9  
 bfh.bfSize=54+size; Gshy$'_e  
 bfh.bfOffBits=54; !{4'=+  
 CFile bf; P5H_iH  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1:iB1TclP  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NBXhcfF  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9[`c"Pd  
  bf.WriteHuge(lpData,size); K_AdMXF9  
  bf.Close(); \#PZZH%  
  nCount++; {{Qbu }/@  
 } g${JdxR:  
 GlobalFreePtr(lpData); ]61Si~Z  
 if(nCount==1) h56Kmxxk  
  m_Number.Format("%d picture captured.",nCount); 8f<y~L_(`  
 else <$@I*xk[  
  m_Number.Format("%d pictures captured.",nCount); lX-i<0`  
  UpdateData(FALSE); c5|sda{  
} }VRl L>HAC  
+?W4ac1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) : h(Z\D_  
{ n!.=05OtX  
 if(pMsg -> message == WM_KEYDOWN) qco uZO  
 { }OhSCH'o6  
  if(pMsg -> wParam == VK_ESCAPE) 7x=4P|(\}  
   return TRUE; z(8G=C  
  if(pMsg -> wParam == VK_RETURN) aNs8T`  
   return TRUE; #?k</~s6M`  
 } sYo&@~T  
 return CDialog::PreTranslateMessage(pMsg); E]8uj8K3]  
} k$ T  
:h |]j[2p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |AacV  
{ *7-rm  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ).IyjHY  
  SaveBmp();  }JWkV1  
  return FALSE; *`|xa@1v`  
} 1<fW .Q)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5~/EAK`  
 CMenu pop; -%]1q#C>@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _;U%`/T b  
 CMenu*pMenu=pop.GetSubMenu(0); 6D[]Jf,9  
 pMenu->SetDefaultItem(ID_EXITICON); zH Z;Y^{+  
 CPoint pt; ~ +>e hU  
 GetCursorPos(&pt); f1v4h[)-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wPm  
 if(id==ID_EXITICON) Ll-QhcC$  
  DeleteIcon(); #AB5}rPEI  
 else if(id==ID_EXIT) ;gZ/i93:Q  
  OnCancel(); 8!cHRtqK  
 return FALSE; b- e  
} |0oaEd^*}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i9De+3VqKK  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^e <E/j{~  
 AddIcon(); \o/eF&  
 return res; <K<#)mcv  
} AoOA.t6RVo  
oQ,<Yx%E3  
void CCaptureDlg::AddIcon() p/RT*?<   
{ :{ZwzJ  
 NOTIFYICONDATA data; +0z7}u\x  
 data.cbSize=sizeof(NOTIFYICONDATA); Eyjsbj8  
 CString tip; G`kz 0Vk  
 tip.LoadString(IDS_ICONTIP); }mK,Bi?bj  
 data.hIcon=GetIcon(0); T]Ai{@i  
 data.hWnd=GetSafeHwnd(); CYQ)'v  
 strcpy(data.szTip,tip); d)bsyZ;U  
 data.uCallbackMessage=IDM_SHELL; !OY}`a(z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pc0{  
 data.uID=98; A]'jsv!+  
 Shell_NotifyIcon(NIM_ADD,&data); /z4c>)fV  
 ShowWindow(SW_HIDE); ZK'46lh  
 bTray=TRUE; q)Nw$dW<  
} (g/A uL  
ltDohm?  
void CCaptureDlg::DeleteIcon() ^}p##7t [  
{ [8IO0lul+  
 NOTIFYICONDATA data; RU4X#gP4Vh  
 data.cbSize=sizeof(NOTIFYICONDATA); [bP^RY:  
 data.hWnd=GetSafeHwnd(); tx>7?e8E  
 data.uID=98; 6Q [  
 Shell_NotifyIcon(NIM_DELETE,&data); >~rlnRX  
 ShowWindow(SW_SHOW); o}114X4q;  
 SetForegroundWindow(); Vi-Ph;6[  
 ShowWindow(SW_SHOWNORMAL); {~&Q"8 }G  
 bTray=FALSE; "4H@&:-(p  
} [UZ r|F  
;[R6rVHe{  
void CCaptureDlg::OnChange() o>,r<  
{ Fy Ih\  
 RegisterHotkey(); czD" mI!  
} *YeQC t-l  
mLZ1u\ 7W  
BOOL CCaptureDlg::RegisterHotkey() pN5kcvQ  
{ N=<`|I  
 UpdateData(); |*NZ^6`@  
 UCHAR mask=0; v f{{z%3T  
 UCHAR key=0; VZWo.Br'W  
 if(m_bControl) [5?Dov^j 3  
  mask|=4; b~,e(D9DG  
 if(m_bAlt) uW!XzX['  
  mask|=2; ^BA%]pe$I  
 if(m_bShift) Dc-K08c  
  mask|=1; .A<Hk1(-)  
  key=Key_Table[m_Key.GetCurSel()]; H575W"53  
 if(bRegistered){ [cd1Mf:[Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6Bjo9,L  
  bRegistered=FALSE; Ia#!T"]@W6  
 } ,7&\jET5^0  
 cMask=mask; vw2E$ya  
 cKey=key; SKH}!Id}n  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fasW b&~z  
 return bRegistered; IHO*%3mA/  
} wg?}c ;  
/\/^= j  
  四、小结 [Xu8~c X  
0AQ4:KV(Y  
  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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