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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: @V>]95RX  
  :UT \L2 q=  
  一、实现方法 (J4( Ge  
OfrzmL<K  
  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: nYyKz Rz  
$<nD-4p  
#pragma data_seg("shareddata") O!>#q4&]  
HHOOK hHook =NULL; //钩子句柄 xVsI#`<a  
UINT nHookCount =0; //挂接的程序数目 mm_)=Ipj>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 XRV~yBIS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,fiV xnQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey oM1C/=8   
static int KeyCount =0; F&`%L#s|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 a{ke%W$*P  
#pragma data_seg() &W3srJo  
ADF<5#I  
  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。 Wlg1t~1=  
zvGncjMkC  
  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: 5222"yn"c  
7 2i&-`&4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '=G6$O2  
cKey,UCHAR cMask) L_ T+KaQCH  
{ aAP86MHO  
 BOOL bAdded=FALSE; s5v}S'uO{  
 for(int index=0;index<MAX_KEY;index++){ x [vb i  
  if(hCallWnd[index]==0){ n?c[ E+i;  
   hCallWnd[index]=hWnd; |L89yjhWBs  
   HotKey[index]=cKey; pFs/ipZX^*  
   HotKeyMask[index]=cMask; 43g1/,klm  
   bAdded=TRUE; 9b6U] z,  
   KeyCount++; 3u t<o-  
   break; ^f N/  
  } ^d# AU7V|  
 } Uo9@Y{<B  
 return bAdded; @ o<O I  
} QeT~s5 H  
//删除热键 <8~c7kT'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _9"ZMUZ{  
{ 4lCbUk[l  
 BOOL bRemoved=FALSE; ` >>]$ZJ  
 for(int index=0;index<MAX_KEY;index++){ S@[NKY  
  if(hCallWnd[index]==hWnd){ >mtwXmI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ P_H2[d&/>D  
    hCallWnd[index]=NULL; o+{7"Na8[  
    HotKey[index]=0; w_"-rGV  
    HotKeyMask[index]=0; uzb|yV'B  
    bRemoved=TRUE; } PL{i  
    KeyCount--; %<8?$-[  
    break; mYfHBW:  
   } +BM[@?"hrh  
  } b7+(g [O  
 } S.>fB7'(?=  
 return bRemoved; ^N^s|c'  
} )l(DtU!E  
NZG ^B/  
g`Q!5WK*  
  DLL中的钩子函数如下: nxEC6Vh'  
DD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3=?,Dv0P  
{ [uJS. `b  
 BOOL bProcessed=FALSE; )x?)v#k  
 if(HC_ACTION==nCode) =/xx:D/  
 { mm*nXJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 uwi.Sg11  
   switch(wParam) 4Q1R:Ra  
   {  , ExY.'%1  
    case VK_MENU: ,*9gy$  
     MaskBits&=~ALTBIT; kZ6:= l  
     break; iZ/iMDfC  
    case VK_CONTROL: |}8SjZcQW  
     MaskBits&=~CTRLBIT; UCj<FN `  
     break; YuHXm3[  
    case VK_SHIFT: `|&0j4(Pg  
     MaskBits&=~SHIFTBIT; @o1#J` rv  
     break; z[vu- f9  
    default: //judge the key and send message gw">xt5  
     break; M17+F?27M  
   } ;jQ^8 S  
   for(int index=0;index<MAX_KEY;index++){ 6~>h;wC  
    if(hCallWnd[index]==NULL) o*E32#l  
     continue; > Xij+tt{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hj1?c,mo4  
    { j%ZBAk)}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); eNH9`Aa  
     bProcessed=TRUE; I!(BwYd  
    } BaUuDo/ZO  
   } Q t>|TGz  
  } `PeC,bp  
  else if((lParam&0xc000ffff)==1){ //有键按下 g-u4E^,*|  
   switch(wParam) 6wbH{}\ll  
   { 4$mtc*tzT  
    case VK_MENU: .h/2-pQ>  
     MaskBits|=ALTBIT; lqO>Q1_{K  
     break; A@Zqh<,Ud  
    case VK_CONTROL: <Voct  
     MaskBits|=CTRLBIT; WuI$   
     break; A5\ Hq  
    case VK_SHIFT: B\aVE|~PB  
     MaskBits|=SHIFTBIT; P;K3T![  
     break; ={]POL\ A  
    default: //judge the key and send message F|'u0JQ)$  
     break; {,(iL8,^  
   } b>#=7;  
   for(int index=0;index<MAX_KEY;index++){ II=!E  
    if(hCallWnd[index]==NULL) X f;R'a,$  
     continue; iv],:|Mbd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2 p}I  
    { zK_P3r LsS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,_<|e\>~  
     bProcessed=TRUE; X(.[rC>  
    } r XBC M  
   } JrX. f  
  } ZzQLbCV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Nq6; z)$  
   for(int index=0;index<MAX_KEY;index++){ !&.-{ _$  
    if(hCallWnd[index]==NULL) P1^|r}  
     continue; 3xdJ<Lrq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q W c^}#!!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QUZ+#*:s  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \hEIQjfi  
   } z yp3 +|  
  } iweT @P`  
 } A>mk0P)~Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Akws I@@  
} >lyE@S sA  
-eD]gm  
  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: 8<ev5af  
SXE@\Afj  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8X278^ #  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q \fyp\z  
=[Z3]#h  
  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: \L}7.fkb8  
l,3,$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) darbL_1  
{ 5}! 36SO\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5'V-Ly)*%  
 { \Mdi eO*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Eht8~"fj  
  SaveBmp(); <9:~u]ixt  
  return FALSE; 9d( M%F  
 } C(z 'oi:f  
 …… //其它处理及默认处理 ?<\2}1  
} ( *K)D$y  
@[f$MRp\  
jaavh6h)  
  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。 \!w |  
zuFPG{^\#  
  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。 qzO5p=}  
suFk<^3  
  二、编程步骤 WIAukM8~  
jffNA^e  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0jPUDkH*  
^ZRZ0:rZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GZn=Hgv8  
K_:2sDCaN  
  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; |b^UPrz)VS  
$A/?evJi8R  
  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; d%nX;w,  
1A#/70Mo  
  5、 添加代码,编译运行程序。 .!i`YT*jF  
wa`c3PQGu  
三、程序代码 >p;&AaXkoG  
;KEie@Ry  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL k\dPF@~Hvl  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :qAX9T'{t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ % -+7=x  
#if _MSC_VER > 1000 xD~r Q$6sI  
#pragma once ( plT/0=^t  
#endif // _MSC_VER > 1000 O,v C:av  
#ifndef __AFXWIN_H__ WB<MU:.Vc  
#error include 'stdafx.h' before including this file for PCH gf9U<J#&C  
#endif S;D]ym  
#include "resource.h" // main symbols ro3%VA=V  
class CHookApp : public CWinApp -xN/H,xok  
{ nG{o$v_|  
 public: 5~im.XfiVx  
  CHookApp(); Q00v(6V46  
  // Overrides :(" @U,  
  // ClassWizard generated virtual function overrides oe3=QE  
  //{{AFX_VIRTUAL(CHookApp) 8|L@-F  
 public: Zg>]!^X8  
  virtual BOOL InitInstance(); ,w9| ?%S  
  virtual int ExitInstance(); 2dHsM'ze  
  //}}AFX_VIRTUAL x'OP0],#  
  //{{AFX_MSG(CHookApp) 3p?nQ O)L  
  // NOTE - the ClassWizard will add and remove member functions here. C+%eT&OO  
  // DO NOT EDIT what you see in these blocks of generated code ! fOdqr  
  //}}AFX_MSG }QQ 7jE  
  DECLARE_MESSAGE_MAP() $d4&H/u^  
}; ^K_FGE0ec  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /(u? k%Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VZ">vIRyi|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]l+<-  
BOOL InitHotkey(); n\<7`,  
BOOL UnInit(); @$;8k }  
#endif =VT\$ 5A  
Qnt9x,1m_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6U$e;cr6  
#include "stdafx.h" \Y8 sIs  
#include "hook.h" 7sWe32  
#include <windowsx.h> |-S+x]9  
#ifdef _DEBUG "O|.e`C%^  
#define new DEBUG_NEW | WTWj  
#undef THIS_FILE :=5X)10  
static char THIS_FILE[] = __FILE__; _' X  
#endif !y>up+cRjl  
#define MAX_KEY 100 4i }nk T  
#define CTRLBIT 0x04 B*Om\I  
#define ALTBIT 0x02 vW!O("\7K<  
#define SHIFTBIT 0x01 UugR  
#pragma data_seg("shareddata") K=}Eupn=  
HHOOK hHook =NULL; q bCU&G|)  
UINT nHookCount =0; f1elzANy  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey PlK3;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7zA+UWr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey mO(Y>|mm  
static int KeyCount =0; so/0f1R?~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift TA:uB[Ji  
#pragma data_seg() +{m+aHk  
HINSTANCE hins; fE&s 6w&  
void VerifyWindow(); nt-_)4Fm  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }aI>dHL  
//{{AFX_MSG_MAP(CHookApp) P/^@t+KC  
// NOTE - the ClassWizard will add and remove mapping macros here. HY?#r]Ryt  
// DO NOT EDIT what you see in these blocks of generated code! oOAkwc%)b  
//}}AFX_MSG_MAP v0=v1G*rvJ  
END_MESSAGE_MAP() c#1kg@q@  
~RwoktO  
CHookApp::CHookApp() ^8]7  
{ :F#^Q%-IS  
 // TODO: add construction code here, Q-#<{' (  
 // Place all significant initialization in InitInstance #h U4gX,  
} 3/uvw>$  
, /jHhKW  
CHookApp theApp; ?z6K/'?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }bdoJ5  
{ LpSF*xm  
 BOOL bProcessed=FALSE; }|N88PN  
 if(HC_ACTION==nCode) `kv7Rr}Q  
 { SDNRcSbOD6  
  if((lParam&0xc0000000)==0xc0000000){// Key up XP:fL NpQ  
   switch(wParam) _*8 6  
   { C!9mygI  
    case VK_MENU: dTu*%S1Z  
     MaskBits&=~ALTBIT; JKO*bbj  
     break; n9k  
    case VK_CONTROL: Nh/i'q/  
     MaskBits&=~CTRLBIT; *qAG0EM|  
     break; j!oX\Y-:&  
    case VK_SHIFT: /FpPf[  
     MaskBits&=~SHIFTBIT; O@W/s!&lFa  
     break; ZWzr8oY)  
    default: //judge the key and send message YWDgRb  
     break; j8bA"r1  
   } VAUd^6Xdwx  
   for(int index=0;index<MAX_KEY;index++){ I>vU;xV\m  
    if(hCallWnd[index]==NULL) 0dS(g&ZR  
     continue; ?m7i7Dz   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T /IX(b'<  
    { H"k\(SPVS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4g}r+!T  
     bProcessed=TRUE; `.3.n8V  
    } &y|PseH"  
   } nN@ Ch  
  } E_[a|N"D  
  else if((lParam&0xc000ffff)==1){ //Key down z8%qCq  
   switch(wParam) gzH;`,  
   { * a1q M?  
    case VK_MENU: }NG P!  
     MaskBits|=ALTBIT; hNkv lk'Ui  
     break; PVdN)tG5  
    case VK_CONTROL: "oFi+']*  
     MaskBits|=CTRLBIT; . .S3-(xW  
     break; UzIE,A  
    case VK_SHIFT: H.C*IL9  
     MaskBits|=SHIFTBIT; +Zr~mwM=x  
     break; gW4fwE^  
    default: //judge the key and send message nhC8Tq[m  
     break; f<nK;  
   } E4Ez)IaKyi  
   for(int index=0;index<MAX_KEY;index++) |;t{L^  
   { t0v >J9  
    if(hCallWnd[index]==NULL) 7r)]9_[(  
     continue; +/kOUz/]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B B'qbX3xK  
    { Ie=gI+2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3fXrwmBT8  
     bProcessed=TRUE; c+T`X?.j  
    } Q8QB{*4  
   } vdB2T2F  
  } $)PS#ND&  
  if(!bProcessed){ |r?0!;bN0  
   for(int index=0;index<MAX_KEY;index++){ ,O-_Pv  
    if(hCallWnd[index]==NULL) .m>Qlh  
     continue; gi5X ,:[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +F-Y^):  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *icaKy3  
   } n+Conp/  
  } QJiH^KY6  
 } x5pu+-h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F$1{w"&  
} c(FGW7L<  
-r_\=<(  
BOOL InitHotkey() :"Tkl$@,  
{ 1=sL[I7<  
 if(hHook!=NULL){ @|">j#0  
  nHookCount++; C"0 VOb  
  return TRUE; )D'# >!Y  
 } z[R dM#L  
 else ZU.E}Rn:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6-/W4L)?>  
  if(hHook!=NULL) qvGm JN0  
   nHookCount++; "cly99t  
  return (hHook!=NULL); ZF#n(Y?  
} !;[cJbqnh  
BOOL UnInit() |JWYsqJ0U  
{ m?Cb^WgcF  
 if(nHookCount>1){ Oj_F1. r  
  nHookCount--; )^4Ljb1  
  return TRUE; pr4y*!|Y$  
 } v3t<rv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KU0Ad);e  
 if(unhooked==TRUE){ BI*0JKQu  
  nHookCount=0; b2[U3)|oO  
  hHook=NULL; OkISR j'!U  
 } \pTC[Ry1  
 return unhooked; |*h{GX.(  
} fz|_c*&64  
7P*\|Sxk%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t98S[Z(-%+  
{ )t7MD(  
 BOOL bAdded=FALSE; GVn'p Wg  
 for(int index=0;index<MAX_KEY;index++){ 7 <]YK`a2d  
  if(hCallWnd[index]==0){ "zTy_0[;  
   hCallWnd[index]=hWnd; h&d"|<  
   HotKey[index]=cKey; gp$Rf9\  
   HotKeyMask[index]=cMask; xt "-Jmox  
   bAdded=TRUE; v.TgB)  
   KeyCount++; -JPkC(V7]  
   break; c>3? T^=  
  } ~OxFgKn23&  
 } ZPq.|6&  
 return bAdded; gV\Y>y4v  
} p8YOow7)  
Ik5V?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ohJDu{V  
{ M}CxCEdDB]  
 BOOL bRemoved=FALSE; ,C 0y3pL  
 for(int index=0;index<MAX_KEY;index++){ 6w m-uu  
  if(hCallWnd[index]==hWnd){ D/4]r@M2c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I!1+#0SG  
    hCallWnd[index]=NULL; iT O Y  
    HotKey[index]=0; 5P\A++2 2Y  
    HotKeyMask[index]=0; FU .%td=:  
    bRemoved=TRUE; ,2^A<IwR  
    KeyCount--; JTBt=u{6^  
    break; /z`tI  
   } \{~CO{II  
  } dvZlkMm   
 } k2,`W2] ^E  
 return bRemoved; eK*oV}U-k  
} K4]ZVMm/*  
5|Z8UzL  
void VerifyWindow() UhkL=+PD  
{ O#O"]A  
 for(int i=0;i<MAX_KEY;i++){ $ #GuV'  
  if(hCallWnd!=NULL){ yuJ>xsM  
   if(!IsWindow(hCallWnd)){ ' ;nG4+K  
    hCallWnd=NULL; o.Y6(o  
    HotKey=0; CH| cK8q  
    HotKeyMask=0; 5M5vxJ)Lh  
    KeyCount--; 8+".r2*_iO  
   } fB,eeT1v?h  
  } $ywROa]  
 } 9b,0_IMHH  
} J:ka@2>|  
/7p(%vr  
BOOL CHookApp::InitInstance() 41+WIa L  
{ l`:u5\ rM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1ZYo-a;)  
 hins=AfxGetInstanceHandle(); T:2f*!r  
 InitHotkey(); 3k(tv U+eC  
 return CWinApp::InitInstance(); ?K2}<H-  
} cTRtMk%^  
>b5 ;I1o=y  
int CHookApp::ExitInstance() g"Ueo'd*  
{ c$BH`" <*  
 VerifyWindow(); HJym|G>%?  
 UnInit(); Pi9?l>  
 return CWinApp::ExitInstance(); XD0a :T)  
} 6Uq;]@k%  
Zz/p'3?#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *fv BB9raq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Fo;:GX,b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,RY;dX-#  
#if _MSC_VER > 1000 S+- $Ih`[  
#pragma once =h|cs{eT\2  
#endif // _MSC_VER > 1000 Zby3.=.e  
CQa8I2VF (  
class CCaptureDlg : public CDialog cjO %X  
{ .sM,U  
 // Construction oqh J2  
 public: xJU]py~o  
  BOOL bTray; *_#2|96)  
  BOOL bRegistered; S&XlMu  
  BOOL RegisterHotkey(); 6\I1J= C  
  UCHAR cKey; 6J}Yr5oD  
  UCHAR cMask; 6vps`k$,~  
  void DeleteIcon(); nHq4f&(H  
  void AddIcon(); +,$pcf<[V  
  UINT nCount; XK@&$~iA3  
  void SaveBmp(); YX)Rs Vf  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r@vt.t0#  
  // Dialog Data XOI"BLd  
  //{{AFX_DATA(CCaptureDlg) ^?sP[;8S!  
  enum { IDD = IDD_CAPTURE_DIALOG }; $0un`&W  
  CComboBox m_Key; 8Lx1XbwK  
  BOOL m_bControl; =_ N[mR^  
  BOOL m_bAlt; qnWM  %k  
  BOOL m_bShift; (y&sUc9  
  CString m_Path; B9$f y).Gp  
  CString m_Number; |>'N^   
  //}}AFX_DATA M eep  
  // ClassWizard generated virtual function overrides *l"CIG'  
  //{{AFX_VIRTUAL(CCaptureDlg) zn&ZXFgN  
 public: w%X@os}E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); GbZ~e I`,2  
 protected: WcY_w`*L  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 42 lw>gzr!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  zy"k b  
  //}}AFX_VIRTUAL L]!![v.VY  
  // Implementation #ley3rJW]  
 protected: ~I;x_0iY4  
  HICON m_hIcon; -Q JPJ.  
  // Generated message map functions v7KBYN  
  //{{AFX_MSG(CCaptureDlg) =H;'.!77Hx  
  virtual BOOL OnInitDialog(); *) T"-}F  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v@q&B|0  
  afx_msg void OnPaint(); .|hsn6i/-  
  afx_msg HCURSOR OnQueryDragIcon(); |3T2}ohrr  
  virtual void OnCancel(); [+R_3'aK  
  afx_msg void OnAbout(); X;UEq]kcmn  
  afx_msg void OnBrowse();  8 zlvzp  
  afx_msg void OnChange(); G7v<Q,s  
 //}}AFX_MSG iDl#foXa`  
 DECLARE_MESSAGE_MAP() oPni4^g i  
}; B&B:P  
#endif DQP!e6Of  
W SxoGly  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file srAWet  
#include "stdafx.h" ~TS!5Wiv  
#include "Capture.h" 8]b;l; W5  
#include "CaptureDlg.h" kV T |(Y  
#include <windowsx.h> Sa[lYMuB  
#pragma comment(lib,"hook.lib") y?O-h1"3,  
#ifdef _DEBUG DbFe;3  
#define new DEBUG_NEW 6jgP/~hP>N  
#undef THIS_FILE NQZ /E )f  
static char THIS_FILE[] = __FILE__; Ert={"Q  
#endif !uIY,  
#define IDM_SHELL WM_USER+1 vWM&4|Q1~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a@|H6:|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ,Zb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A[7H-1-  
class CAboutDlg : public CDialog -C~zvP; a  
{ PlS)Zv3  
 public: -qaO$M^Q  
  CAboutDlg(); 0#8, (6  
  // Dialog Data EsX(<bx  
  //{{AFX_DATA(CAboutDlg) \#) YS  
  enum { IDD = IDD_ABOUTBOX }; =p=/@FN  
  //}}AFX_DATA :A @f[Y'9  
  // ClassWizard generated virtual function overrides )[ZXPD  
  //{{AFX_VIRTUAL(CAboutDlg) |nnFjGC`~  
 protected: V V}"zc^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f+s)A(?3  
  //}}AFX_VIRTUAL #V]8FW  
  // Implementation fjy\Q  
 protected: ]u$tKC  
  //{{AFX_MSG(CAboutDlg) W'"?5} (  
  //}}AFX_MSG h4 9q(085V  
  DECLARE_MESSAGE_MAP() eWex/ m  
}; fiA8W  
Xxd D)I  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wEX<[#a-  
{ o -)[{o\  
 //{{AFX_DATA_INIT(CAboutDlg) %$Py@g  
 //}}AFX_DATA_INIT G!I5Er0pdy  
} G7+{O7  
z;?jKE p  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =>3,]hnep  
{ O-W[^r2e  
 CDialog::DoDataExchange(pDX); Q%?%zuU  
 //{{AFX_DATA_MAP(CAboutDlg) p!=8Pq.  
 //}}AFX_DATA_MAP er-0i L@  
} [hg9 0Q6  
Kg>B$fBx)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YlG#sBzl  
 //{{AFX_MSG_MAP(CAboutDlg) L xIKH G  
 // No message handlers 2}/r>]9^-  
 //}}AFX_MSG_MAP - ry  
END_MESSAGE_MAP() Yu_ eCq5/  
0n`Temb/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) VBDb K|  
: CDialog(CCaptureDlg::IDD, pParent) uuF~+=.|  
{ ',WJ'g  
 //{{AFX_DATA_INIT(CCaptureDlg) c U(z5th  
  m_bControl = FALSE; &K9RV4M5  
  m_bAlt = FALSE; @}!?}QU  
  m_bShift = FALSE; {v=[~H>bt  
  m_Path = _T("c:\\"); dnwzf=+>e  
  m_Number = _T("0 picture captured."); I{U|'a  
  nCount=0; ts@$*  
  bRegistered=FALSE; G9QvIXRi  
  bTray=FALSE; H*3u]Ebh  
 //}}AFX_DATA_INIT Q#ksf h!D  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DA>nYj-s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); piIz ff  
} >d]-X]  
-#/DK   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a`^$xOK,  
{ n[K%Xs)  
 CDialog::DoDataExchange(pDX); Q{uO/6  
 //{{AFX_DATA_MAP(CCaptureDlg) -]u>kjiIT  
  DDX_Control(pDX, IDC_KEY, m_Key); is^R8a  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); K3tW Y 4-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -@#],s7  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); xy!E_CuC$  
  DDX_Text(pDX, IDC_PATH, m_Path); t5K#nRd Z:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _:tS-Mx@5  
 //}}AFX_DATA_MAP |4j6}g\  
} 9IG<9uj  
(0LA.aBIf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'sa)_?Hy  
//{{AFX_MSG_MAP(CCaptureDlg) #Y-_kQV*  
 ON_WM_SYSCOMMAND() 4Y1^ U{A+  
 ON_WM_PAINT() Vb JE zl  
 ON_WM_QUERYDRAGICON() { 6qxg_{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) S["r @<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ip{ b*@K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) XfMUodV-OZ  
//}}AFX_MSG_MAP <'sm($.2  
END_MESSAGE_MAP() /@&o%I3h  
4[;}/-  
BOOL CCaptureDlg::OnInitDialog() upk_;ae  
{ z~p!7q&g  
 CDialog::OnInitDialog(); 7^! zT  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); udr|6EjD.  
 ASSERT(IDM_ABOUTBOX < 0xF000); s/11 TgJ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); w?nSQBz$  
 if (pSysMenu != NULL) w;AbJCv2  
 { $qZ6i  
  CString strAboutMenu; |HY{Q1%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 30Qp:_D  
  if (!strAboutMenu.IsEmpty()) $qg2@X.  
  { pMViq0  
   pSysMenu->AppendMenu(MF_SEPARATOR); ;WYz U`<g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #sjGju"#_  
  } $kmY[FWu?  
 } l"X,[  
 SetIcon(m_hIcon, TRUE); // Set big icon &c&TQkx  
 SetIcon(m_hIcon, FALSE); // Set small icon 1?8M31  
 m_Key.SetCurSel(0); T9r6,yY  
 RegisterHotkey(); \?8q&o1=]  
 CMenu* pMenu=GetSystemMenu(FALSE); &;JeLL1J  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p^ROt'eQ<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !~'D;Jh  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5{1=BZftZ  
 return TRUE; // return TRUE unless you set the focus to a control Zn)o@'{}{  
} -}oH],C  
J n2QvUAZ&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \' A- Lp  
{ j%]sym  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) R!X+-  
 { gC kR$.-E  
  CAboutDlg dlgAbout; ZDI?"dt{  
  dlgAbout.DoModal(); O6b+eS  
 } ?LU>2!jN  
 else V7gL*,3>=  
 { UEYJd&n0CB  
  CDialog::OnSysCommand(nID, lParam); C;U4`0=8  
 } awz.~c++  
} 7) RvBcM  
OuWRLcJ!  
void CCaptureDlg::OnPaint() "66#F  
{ J[S!<\_!  
 if (IsIconic()) r #w7qEtD  
 { Z]k@pR !  
  CPaintDC dc(this); // device context for painting $1zWQJd[-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !SGRK01  
  // Center icon in client rectangle x=x%F;  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7aPA+gA/  
  int cyIcon = GetSystemMetrics(SM_CYICON); >nvK{6xR:  
  CRect rect; > MRuoJ  
  GetClientRect(&rect); r_tt~|s,>  
  int x = (rect.Width() - cxIcon + 1) / 2; 4sH?85=j  
  int y = (rect.Height() - cyIcon + 1) / 2; <KCyXU*  
  // Draw the icon ubVZEsoW?  
  dc.DrawIcon(x, y, m_hIcon); K g.O2F77  
 } `0q=Z],  
 else P;'ZdZ(SLu  
 { u:l<NWF^  
  CDialog::OnPaint(); RwrRN+&s\  
 } z?|bs?HKS  
} 8+Gwv SDU  
>T0`( #Lm  
HCURSOR CCaptureDlg::OnQueryDragIcon() #(+V&< K  
{ -*J!Ws(9  
 return (HCURSOR) m_hIcon; e?O$`lf  
} TA:#K  
-3b_}by  
void CCaptureDlg::OnCancel() j:2 F97  
{ >/%XP_q%`e  
 if(bTray) dShGIH?  
  DeleteIcon(); 10m|?  
  CDialog::OnCancel(); ;AL:V U  
} @g" vuaG}  
{/aHZ<I&^h  
void CCaptureDlg::OnAbout() `Nz`5}8.?  
{ .XkVdaX  
 CAboutDlg dlg; "d}ey=$h4  
 dlg.DoModal(); @" umY-1f  
} ,69547#o  
Q+QD ,  
void CCaptureDlg::OnBrowse() @*UV|$~(Q  
{ 4)'U!jSb  
 CString str; x1E;dbOZ  
 BROWSEINFO bi; 0XqxW\8_l  
 char name[MAX_PATH]; pNmWBp|ER  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y Ztd IG  
 bi.hwndOwner=GetSafeHwnd(); M&Ln'BC  
 bi.pszDisplayName=name; n:1Ijh 1  
 bi.lpszTitle="Select folder";  H ="I=}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; inK;n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); tAY{+N]f  
 if(idl==NULL) WlGT&m&2  
  return; d 792#Dc  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C 'Y2kb  
 str.ReleaseBuffer(); <Kl$ek8  
 m_Path=str; JB.U&  
 if(str.GetAt(str.GetLength()-1)!='\\') uq54+zC  
  m_Path+="\\"; ]0|A\bE\S  
 UpdateData(FALSE); 1_Av_X  
} t&EY$'c  
N qz6_!  
void CCaptureDlg::SaveBmp() 0bIgOLP  
{ Mk+G(4p  
 CDC dc; +#<Z/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); M1*bT@ 6  
 CBitmap bm; M,bs`amz  
 int Width=GetSystemMetrics(SM_CXSCREEN); vEGI  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9zIqSjos"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )1 HWD]>4  
 CDC tdc; WNQ<XB qAw  
 tdc.CreateCompatibleDC(&dc); CHD.b%_|  
 CBitmap*pOld=tdc.SelectObject(&bm); A&WC})H5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `c-omNu  
 tdc.SelectObject(pOld); a1_o  
 BITMAP btm; 6Q_A-X3hk  
 bm.GetBitmap(&btm); Sw5-^2x0'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /5j5\F:33  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); R*S:/s  
 BITMAPINFOHEADER bih; Y#=MN~##t  
 bih.biBitCount=btm.bmBitsPixel; T5.^ w  
 bih.biClrImportant=0; m&'!^{av  
 bih.biClrUsed=0; ,j.bdlI#  
 bih.biCompression=0; jcBZ#|B7;  
 bih.biHeight=btm.bmHeight; n5IQKYr g  
 bih.biPlanes=1; /m 7~-~$V  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z{yH:{Vk  
 bih.biSizeImage=size; 0\@oqw]6hv  
 bih.biWidth=btm.bmWidth; ?N!kYTR%}  
 bih.biXPelsPerMeter=0; ~#}T|  
 bih.biYPelsPerMeter=0; b`=g#B|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6qT-  
 static int filecount=0; rK:cUW0]X  
 CString name; -%^'x&e  
 name.Format("pict%04d.bmp",filecount++); "h7Dye  
 name=m_Path+name; ;ny9q  
 BITMAPFILEHEADER bfh; 0'YP9-C3  
 bfh.bfReserved1=bfh.bfReserved2=0; g]`YI5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); wEJzLFCn  
 bfh.bfSize=54+size; v=cQ`nou  
 bfh.bfOffBits=54; 3T4HX|rC  
 CFile bf; p?4[nS-,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tAI v+L  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M'|p<SO]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4i^WE;|s  
  bf.WriteHuge(lpData,size); K{"hf:k  
  bf.Close(); u |.7w 2  
  nCount++; u*,>$(-u  
 } )58 ~2vR  
 GlobalFreePtr(lpData); o; U!{G(X  
 if(nCount==1) N3@[95  
  m_Number.Format("%d picture captured.",nCount); g-"GZi  
 else L/] (pXEp  
  m_Number.Format("%d pictures captured.",nCount); X ,^([$  
  UpdateData(FALSE); P t/]Z<VL  
} lI.oyR'  
Q[K)Yd  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K :~tZ  
{ mZPvG  
 if(pMsg -> message == WM_KEYDOWN) 1+XM1(|c`  
 { cGdYfi  
  if(pMsg -> wParam == VK_ESCAPE) (}.MB3`#C  
   return TRUE; nbf/WOCk  
  if(pMsg -> wParam == VK_RETURN) ]t`SCsoo  
   return TRUE; gTU5r4xm~  
 } ;B[(~LCyT  
 return CDialog::PreTranslateMessage(pMsg); ; D/6e6  
} dl6U]v=  
dt+r P%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hh*('n>[  
{ %9Z0\ a)[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ kw]?/s`  
  SaveBmp(); Z[ (d7  
  return FALSE; 6yMZ2%  
} _*Z3,*~"X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e6J^J&`|4  
 CMenu pop; 7Zd g314  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !jSgpIp  
 CMenu*pMenu=pop.GetSubMenu(0); ()O&O+R|)  
 pMenu->SetDefaultItem(ID_EXITICON); \]5I atli  
 CPoint pt; /sT?p=[.  
 GetCursorPos(&pt); ubOXEkZ8N  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2{vAs  
 if(id==ID_EXITICON) [Z#Sj=z  
  DeleteIcon(); 5\#I4\  
 else if(id==ID_EXIT) ~QxW^DGa7]  
  OnCancel(); B%MdJ D>  
 return FALSE; pq&[cA_w  
} c1jR j=\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); g,]m8%GHE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _N^w5EBC]  
 AddIcon(); -C3[:g  
 return res; 6l;2kztGp  
} DF4CB#  
%!(C?k!\  
void CCaptureDlg::AddIcon() PM#3N2?|E  
{ /WE\0bf  
 NOTIFYICONDATA data; *vuI'EbM  
 data.cbSize=sizeof(NOTIFYICONDATA); 4"(rZWv  
 CString tip; Dd pcov  
 tip.LoadString(IDS_ICONTIP); ,p#B5Dif/  
 data.hIcon=GetIcon(0); ,I x>.^|  
 data.hWnd=GetSafeHwnd(); *q k7e[IP  
 strcpy(data.szTip,tip); liH#=C8l*%  
 data.uCallbackMessage=IDM_SHELL; S)j( %g  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; :-JryiI  
 data.uID=98; /W BmR R  
 Shell_NotifyIcon(NIM_ADD,&data); n-l_PhPQ`  
 ShowWindow(SW_HIDE); CW?Z\  
 bTray=TRUE; h@G~' \8t  
} LSJ.pBl\X  
cGgfCF^`  
void CCaptureDlg::DeleteIcon() c$7~EP  
{ gK({InOP  
 NOTIFYICONDATA data; Z_m<x!  
 data.cbSize=sizeof(NOTIFYICONDATA); YI,t{Wy  
 data.hWnd=GetSafeHwnd(); 62zu;p9m  
 data.uID=98; m} s.a.x  
 Shell_NotifyIcon(NIM_DELETE,&data); 5:f!EMb  
 ShowWindow(SW_SHOW); L6{gwoZf3  
 SetForegroundWindow(); F=1 #qo<?  
 ShowWindow(SW_SHOWNORMAL); yxp,)os:  
 bTray=FALSE; C)EP;5k'!\  
} A`Y^qXFb`  
Hcu!bOQ  
void CCaptureDlg::OnChange() xn503,5G*7  
{ prz COw  
 RegisterHotkey(); :ZIa   
} pa+'0Y]71  
-kMw[Y  
BOOL CCaptureDlg::RegisterHotkey() ?{B5gaU9F  
{ p8%qU>~+4  
 UpdateData(); n-" (~  
 UCHAR mask=0; ka\{?:r,8  
 UCHAR key=0; 0 h!Du|?  
 if(m_bControl) !uW*~u  
  mask|=4; *S:~U  
 if(m_bAlt) 89(qU  
  mask|=2; pQ:^ ziwa3  
 if(m_bShift) J*$%d1  
  mask|=1; $$1t4=Pz  
  key=Key_Table[m_Key.GetCurSel()]; "}*D,[C5e  
 if(bRegistered){ wb?k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gI;"PkN  
  bRegistered=FALSE; `7: uc@  
 } eQu(3sYb  
 cMask=mask; j0; ~2W#G*  
 cKey=key; {Fw"y %a^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Si?s69  
 return bRegistered; /#M1J:SV  
} CMW4Zqau*  
P7XZ|Td4*  
  四、小结 49&i];:%7%  
+?o!"SJ  
  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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