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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: 9a*}&fL[  
  ^<}eONa  
  一、实现方法 [*k25N  
Iw<: 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: dk^Uf84.Gr  
kCu"G  
#pragma data_seg("shareddata") }RvP*i  
HHOOK hHook =NULL; //钩子句柄 @l:o0(!W  
UINT nHookCount =0; //挂接的程序数目 JP t=~e(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $C;)Tlh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  0"VL6$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }sm PP*  
static int KeyCount =0; h8Bs=T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 i.e1?Zk1  
#pragma data_seg() ; =FSpZ@  
d/k70Ybk  
  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。 dt -=7mz#  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: f2JeXsOI  
&ZRriqsQg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  Nx8~Rn  
cKey,UCHAR cMask) ~P47:IZf  
{ i@C1}o-/  
 BOOL bAdded=FALSE; Oz[]]`C1  
 for(int index=0;index<MAX_KEY;index++){ SeC[,  
  if(hCallWnd[index]==0){ &z@~n  
   hCallWnd[index]=hWnd; =wEqI)Td  
   HotKey[index]=cKey;  6tPgFa#N  
   HotKeyMask[index]=cMask; XPhC*r  
   bAdded=TRUE; )r)3.|wJm  
   KeyCount++; H 40~i=.  
   break; 7( &\)qf=n  
  } 5VU 5kiCt  
 } E8Jy!8/X9T  
 return bAdded; ?J<V-,i  
} .FarKW  
//删除热键 l1&NU'WW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;w/|5 ;{A;  
{ 7$l!f  
 BOOL bRemoved=FALSE; ._uXK[c7P  
 for(int index=0;index<MAX_KEY;index++){ "lFS{7  
  if(hCallWnd[index]==hWnd){ ^11y8[[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6i6m*=h  
    hCallWnd[index]=NULL; 9Dq^x&z(  
    HotKey[index]=0; P,|%7'?Y  
    HotKeyMask[index]=0; ]>33sb S6  
    bRemoved=TRUE; JfJLJ(}  
    KeyCount--; I,*zZNv Ri  
    break; atW=xn  
   } UkE  fuH  
  } !&$uq|-  
 } (^:0g.~c  
 return bRemoved; ,[ UqUEO  
} eCDwY:t`  
GI~JIXHTQ  
5@YrtZI  
  DLL中的钩子函数如下: h&t/ L  
o1m+4.-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5cv&`h8uo_  
{ J-6l<%962%  
 BOOL bProcessed=FALSE; *?2aIz"  
 if(HC_ACTION==nCode) m zh8<w?ns  
 { m~[4eH,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i;u#<y{E  
   switch(wParam) *Vbf ;=Mb  
   {  VO (KQx  
    case VK_MENU: }=dUASL  
     MaskBits&=~ALTBIT; &%@b;)]J  
     break; B#>7;xy>  
    case VK_CONTROL: qHZ!~Kq,"'  
     MaskBits&=~CTRLBIT; ^ZxT0oaL  
     break; w)# Lu/  
    case VK_SHIFT: lo1<t<w`  
     MaskBits&=~SHIFTBIT; Z%Kkh2-uh  
     break; _ (U|Kpi  
    default: //judge the key and send message ^V1.Y  
     break; \iBEyr]  
   } K@JGGgrE`!  
   for(int index=0;index<MAX_KEY;index++){ kBh*@gf  
    if(hCallWnd[index]==NULL) ~HFqAOr  
     continue; Bb,l.w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eucacXiZ  
    { N(6Q`zs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >1}RiOd3  
     bProcessed=TRUE; 4"om;+\  
    } I%^Bl:M  
   } K1th>!JW'  
  } 6n|R<DO%\  
  else if((lParam&0xc000ffff)==1){ //有键按下 p;y\%i_  
   switch(wParam) Y#VtZTcT  
   { eWN[EJI<  
    case VK_MENU: GOKca%DT=  
     MaskBits|=ALTBIT; ,2|(UTv  
     break; Oc Gg'R7  
    case VK_CONTROL: mMNT.a  
     MaskBits|=CTRLBIT; ~t>i+{J KE  
     break; s=Cu-.~L  
    case VK_SHIFT: vKcZgIR  
     MaskBits|=SHIFTBIT; IL]Js W  
     break; #j+0jFu  
    default: //judge the key and send message qZV.~F+  
     break; 0^0Q0A  
   } U#qs^f7R  
   for(int index=0;index<MAX_KEY;index++){ TrYt(F{t  
    if(hCallWnd[index]==NULL) 0r=KY@D  
     continue; 'lsG?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !OCb^y  
    { \CY_nn|&g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lpy( un  
     bProcessed=TRUE; !`A]YcQ  
    } r1jsw j%7  
   } 6UK}?+r~  
  } ~7G@S&<PK(  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 33M10 1X{6  
   for(int index=0;index<MAX_KEY;index++){ SHAC(3o /e  
    if(hCallWnd[index]==NULL) Rk8oshS+2  
     continue; QY^v*+lr\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >" &&,~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mRECd Gst  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6EX_IDb  
   } ;8~tt I  
  } < Z>p1S  
 } nNEIwlj;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J7RO*.O&Iq  
} ![ce=9@t<  
[X\<C '<  
  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: ~+~^c|  
[ r<0[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C$<['D?8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1MPn{#Ff  
J"$Y`;  
  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: x1O]@Z{d\  
M[= #%U3*N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !eC]=PoY  
{ +kj d;u#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?a]1$>r  
 { OgOs9=cE{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 k-;A9!^h  
  SaveBmp(); f]*TIYicc  
  return FALSE; ~ Pm[Ud  
 } KE_GC ;bQ  
 …… //其它处理及默认处理 -Wt (t2  
} ?xT ^9  
C)RJjaOr  
 ds#om2)  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 9i?Q=Vuc~<  
U9/>}Ni%3G  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 H wu (}  
79bt%P  
  二、编程步骤 !8Mi+ZV  
8%,u~ELA  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; w(EUe4 w{  
Wu1">|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Lc?q0x^s  
kWKAtv5@w  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; K]Rb~+a<  
rQ:+LVfXjA  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Z{ AF8r  
"Xz[|Xl  
  5、 添加代码,编译运行程序。 b-"kclK  
mR1|8H!f  
三、程序代码 PX$_."WA  
V-N`R-FSr  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL VmbfwHRWb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) b;~?a#Z}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ m+LP5S  
#if _MSC_VER > 1000 +ak<yV1=  
#pragma once "/~KB~bB  
#endif // _MSC_VER > 1000 r/e} DYL&  
#ifndef __AFXWIN_H__ )C^@U&h&  
#error include 'stdafx.h' before including this file for PCH \:pd+8  
#endif zir?13N7  
#include "resource.h" // main symbols "P9SW?',  
class CHookApp : public CWinApp W02t6DW  
{ +DR,&;  
 public: _C&XwC Im  
  CHookApp(); r1R\cor  
  // Overrides tT`{xM  
  // ClassWizard generated virtual function overrides D3 .$Vl,.  
  //{{AFX_VIRTUAL(CHookApp) G1?m}{D)  
 public: Mf_urbp]  
  virtual BOOL InitInstance(); *vS)aRK  
  virtual int ExitInstance(); Tsc2;I  
  //}}AFX_VIRTUAL 5@/hqOiu  
  //{{AFX_MSG(CHookApp) 2$=I+8IL  
  // NOTE - the ClassWizard will add and remove member functions here. zAA3bgaa  
  // DO NOT EDIT what you see in these blocks of generated code ! i[r>^U8O  
  //}}AFX_MSG BHrNDpv  
  DECLARE_MESSAGE_MAP() &XF@Dvv  
}; e'MLLC [  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OY'6~w9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 37U$9]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .EXxNB]%Y&  
BOOL InitHotkey(); 8v12<ktR`  
BOOL UnInit(); $?M$^- (e  
#endif *3s,~<''%  
D@iE2-n&V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (V:)`A_-  
#include "stdafx.h" +h?Rb3=S  
#include "hook.h" 8;+dlWp  
#include <windowsx.h> _WB*ArR  
#ifdef _DEBUG CWx_9b zk  
#define new DEBUG_NEW 0m>?-/uDx  
#undef THIS_FILE o7^u@*"F  
static char THIS_FILE[] = __FILE__; Hr}pO"%  
#endif zLS=>iLD{  
#define MAX_KEY 100 rpn&.#KS  
#define CTRLBIT 0x04 -D^.I  
#define ALTBIT 0x02 +|c1G[Jh  
#define SHIFTBIT 0x01 eGE[4Z  
#pragma data_seg("shareddata") b 8~7C4  
HHOOK hHook =NULL; 'joE-{  
UINT nHookCount =0; {+  @M!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey /`H{ n$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -s,guW |  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &O;' ?/4 S  
static int KeyCount =0; %YV3-W8S0  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m14OPZ<3?-  
#pragma data_seg() %5-   
HINSTANCE hins; M?G4k]  
void VerifyWindow(); -xMM}r y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @mRda %qR  
//{{AFX_MSG_MAP(CHookApp) v#ERXIrf  
// NOTE - the ClassWizard will add and remove mapping macros here. I?#B_R#  
// DO NOT EDIT what you see in these blocks of generated code! VU ,tCTXz  
//}}AFX_MSG_MAP ("T8mt[w>  
END_MESSAGE_MAP() 6,j&u7  
Hr/3nq}.  
CHookApp::CHookApp() AiOz1Er  
{ 68YJ@(iS  
 // TODO: add construction code here, y>iote~  
 // Place all significant initialization in InitInstance ^,,lo<d_L  
} _ H$^m#h  
y1*z," dx  
CHookApp theApp; GkYD:o=qx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `bMwt?[*  
{ S/H!a:_5r  
 BOOL bProcessed=FALSE; 3lo.YLP^  
 if(HC_ACTION==nCode) .p?kAf`  
 { )uxXG `,h  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8Ssk>M*  
   switch(wParam) @$] CC1Y  
   { r}~|,O3bc'  
    case VK_MENU: d_w^u|(K  
     MaskBits&=~ALTBIT; `@#,5S$ E  
     break; q+)csgN  
    case VK_CONTROL: UukHz}(E  
     MaskBits&=~CTRLBIT; !PuW6  
     break; \r^*4P,,  
    case VK_SHIFT: C$#X6Q!,  
     MaskBits&=~SHIFTBIT; [>xGynU0  
     break; 3E`poE  
    default: //judge the key and send message ptvM>zw'~g  
     break; BzyzOtBp3L  
   } 0$e]?]X6  
   for(int index=0;index<MAX_KEY;index++){ y+K21(z.  
    if(hCallWnd[index]==NULL)  EWn\ ]f|  
     continue; <h<4R Rj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -Ka0B={Z  
    { dd|/I1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); T*i rCe  
     bProcessed=TRUE; w$)E#|i  
    } 6z>Zm1h  
   } "F8A:tR  
  } 8"2X 8C8  
  else if((lParam&0xc000ffff)==1){ //Key down Ey**j  
   switch(wParam) qw mZOR#  
   { o])2_e5  
    case VK_MENU: F2k)hG*|{  
     MaskBits|=ALTBIT; +'fdAc:5',  
     break; 3G9AS#-C  
    case VK_CONTROL: 7.DAwx.HYK  
     MaskBits|=CTRLBIT; ~n $e  
     break; f[$9k}.  
    case VK_SHIFT: dab[x@#r>  
     MaskBits|=SHIFTBIT; ({l!'>?  
     break; c N^,-~U  
    default: //judge the key and send message +5C*i@v  
     break; )Og,VXEB  
   } KtY_m`DY4R  
   for(int index=0;index<MAX_KEY;index++) oP( Hkp,'  
   { ee5QZ,  
    if(hCallWnd[index]==NULL) 8`j;v>2  
     continue; DGllJ_/Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w+Cs=!  
    { J;S@Q/s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a}]zwV&  
     bProcessed=TRUE; $Y Cy,Ew   
    } |=CV.Su  
   } Tr@}  
  } SpG^kI #  
  if(!bProcessed){ )s';m$  
   for(int index=0;index<MAX_KEY;index++){ 9azk(OL6  
    if(hCallWnd[index]==NULL) #7~i.8L  
     continue; |[]"{Eo"}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2n`OcXCh/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5 LZ+~!2+  
   } '5vgpmn  
  } 4lqowg0  
 } sG~5O\,E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bWAVBF  
} qp@:Zqz8  
wt@q+9:  
BOOL InitHotkey() K[( h2&  
{ R0v5mD$:G  
 if(hHook!=NULL){ z9#iU>@  
  nHookCount++; 1*!`G5c,}  
  return TRUE; {Noa4i  
 } ua -cX3E  
 else (8*& 42W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y"U -Rc  
  if(hHook!=NULL) i C nWb  
   nHookCount++; k_c8\::p#  
  return (hHook!=NULL); 2Hp#~cE+.  
} c%+9uu3  
BOOL UnInit() fy`e)?46  
{ ,.ln  
 if(nHookCount>1){ Y :0SrB!\  
  nHookCount--; z7H[\4A!>  
  return TRUE; b6k'`vLA  
 } j+c<0,Kj  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h6dVT9  
 if(unhooked==TRUE){ ^BruRgc+  
  nHookCount=0; ~X/1%  
  hHook=NULL; `<C/-Au  
 } B0^0d*8t|@  
 return unhooked; B0KZdBRx}  
} mt+IB4`  
wER>a (  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) '14 G0<;yL  
{ yBPaGZ{f  
 BOOL bAdded=FALSE; `.FvuwP  
 for(int index=0;index<MAX_KEY;index++){ P"<HxT?  
  if(hCallWnd[index]==0){ bw8~p%l?  
   hCallWnd[index]=hWnd; ,\|W,N}~  
   HotKey[index]=cKey; 9W{=6D86e  
   HotKeyMask[index]=cMask; }lk_Oe1  
   bAdded=TRUE; 8W]6/st?]  
   KeyCount++; pOCLyM9c  
   break;  wv2  
  } XZv(B^  
 } ~7W?W<  
 return bAdded; IQS:tL/  
} Ew=8"V`C  
*:q3<\y{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q`qHzb~%  
{ O6^>L0'  
 BOOL bRemoved=FALSE; i '5Q.uX  
 for(int index=0;index<MAX_KEY;index++){ _U.D*f<3)  
  if(hCallWnd[index]==hWnd){ n+M:0{Y|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .O{2]e$  
    hCallWnd[index]=NULL; dooS|Mq  
    HotKey[index]=0; Ocq.<#||H  
    HotKeyMask[index]=0; g3%Xh0007{  
    bRemoved=TRUE; 99@uU[&IJ  
    KeyCount--; n# %mL<  
    break; u6A ReL 'f  
   } IRemF@  
  } <|NP!eMsw8  
 } 4ey m$UWw  
 return bRemoved; Uj)~>V'  
} t%e}'?#^  
2<Tbd"x?  
void VerifyWindow() coHzbD~#H  
{ )v-sde\  
 for(int i=0;i<MAX_KEY;i++){ +-=w`  
  if(hCallWnd!=NULL){ +zQ a"Ep*  
   if(!IsWindow(hCallWnd)){ X ?/C9  
    hCallWnd=NULL; h&+dIk\[3  
    HotKey=0; Ji_3*(  
    HotKeyMask=0; 3[E3]]OVa  
    KeyCount--; u=h:d+rq@  
   } $ZD1_sJ.  
  } nk,X6o9%  
 } 6.},y<E  
} ErK5iTSD  
-aDGXQM{~  
BOOL CHookApp::InitInstance()  u%<Je  
{ ty|E[Ez1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Ll%CeP  
 hins=AfxGetInstanceHandle(); ;Ft_ Xiq  
 InitHotkey(); LMf_wsp  
 return CWinApp::InitInstance(); }1P>^I"[Y  
} |*W`}i  
JzJS?ZF  
int CHookApp::ExitInstance() a$p?r3y  
{ wK+%[i&,  
 VerifyWindow(); N/QTf1$  
 UnInit(); Z~o6%_xe  
 return CWinApp::ExitInstance(); _-$"F>  
} lC Bb0k2  
cF9bSY_Eh  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Xm./XC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P08=?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +1R?R9^Fw  
#if _MSC_VER > 1000 n 0_q-8r  
#pragma once V(mz||'*  
#endif // _MSC_VER > 1000 (+d7cln  
5o 4\Jwt  
class CCaptureDlg : public CDialog D<5;4Mb  
{ FUic7>  
 // Construction =T'N6x5@  
 public: Vp*#,(_G:  
  BOOL bTray; i>YD_#w  
  BOOL bRegistered; fr$E'+l)  
  BOOL RegisterHotkey(); }{Ab:+aNd  
  UCHAR cKey; #Hl0>"k ,  
  UCHAR cMask; T u>5H`  
  void DeleteIcon(); DT`TA#O  
  void AddIcon(); 5qzFH,  
  UINT nCount; .}n%gc~A  
  void SaveBmp(); 0b%"=J2/p.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {.=089`{  
  // Dialog Data #~l(t_m{  
  //{{AFX_DATA(CCaptureDlg) ~Ts^z(v~D2  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4}@J]_]Z  
  CComboBox m_Key; w Q /IT}-  
  BOOL m_bControl; 'thWo wE  
  BOOL m_bAlt; ?AC flU_k  
  BOOL m_bShift; +eSNwR=  
  CString m_Path; % UDz4?zx  
  CString m_Number; o2  
  //}}AFX_DATA XKD0n^L[  
  // ClassWizard generated virtual function overrides h.PVRAwk  
  //{{AFX_VIRTUAL(CCaptureDlg) `)Z"||8K  
 public: n qSjP5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ME"B1 Se\  
 protected: c5x2FM z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1p&e:v  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]hNio6CVm  
  //}}AFX_VIRTUAL (}ObX!,  
  // Implementation Y5nj _xQJL  
 protected: Y 3W_Z  
  HICON m_hIcon; LpwjP4vWJ  
  // Generated message map functions ZbVo<p5* ]  
  //{{AFX_MSG(CCaptureDlg) [=k$Q (.3  
  virtual BOOL OnInitDialog(); f]Jn\7j4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H9}z0VI  
  afx_msg void OnPaint(); ;}v#hKC~  
  afx_msg HCURSOR OnQueryDragIcon(); "M#A `b  
  virtual void OnCancel(); dm8N;r/w  
  afx_msg void OnAbout(); 86pujXjc'  
  afx_msg void OnBrowse(); m)l<2 `CM  
  afx_msg void OnChange(); B:Y"X:Y  
 //}}AFX_MSG iNj*G j  
 DECLARE_MESSAGE_MAP() g\_J  
}; DFDlp  
#endif oYOR%'0*m+  
T1,Nb>gBq^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m)"gj**|y  
#include "stdafx.h" Jbv66)0M  
#include "Capture.h" ^3re*u4b=  
#include "CaptureDlg.h" M)sM G C  
#include <windowsx.h> $*N^ bj  
#pragma comment(lib,"hook.lib") *AK{GfP_  
#ifdef _DEBUG ]fxYS m  
#define new DEBUG_NEW !1G6ZC:z  
#undef THIS_FILE KrVP#|9%"  
static char THIS_FILE[] = __FILE__; og0su  
#endif \ZNUt$\  
#define IDM_SHELL WM_USER+1 yW3!V-iA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ruy qB>[o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'W'['TV  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9)P-<  
class CAboutDlg : public CDialog :wWPEhK  
{ u={A4A#  
 public: \! `k:lusa  
  CAboutDlg(); =CBY_  
  // Dialog Data MZJ@qIg[Y  
  //{{AFX_DATA(CAboutDlg) v_U+wga  
  enum { IDD = IDD_ABOUTBOX }; i 'bviD  
  //}}AFX_DATA 'uy\vR&Pz  
  // ClassWizard generated virtual function overrides ?2d! ^!9  
  //{{AFX_VIRTUAL(CAboutDlg) 7 ) Q>R  
 protected: :Vdo.uUa  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support % YgGw:wZ  
  //}}AFX_VIRTUAL :$k] ;  
  // Implementation l!S}gbM  
 protected: |q+3X)Y  
  //{{AFX_MSG(CAboutDlg) hIBW$  
  //}}AFX_MSG 8d|/^U.w~V  
  DECLARE_MESSAGE_MAP() 4~8!3JH39  
}; Dk ^,iY(u  
su2|x  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {&u`d.Lk2p  
{ 2!@ER i  
 //{{AFX_DATA_INIT(CAboutDlg) hYvWD.c}  
 //}}AFX_DATA_INIT ZMp5d4y5  
} g>gVO@"b2  
py-5 :g}d  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }N^3P0XjYq  
{ 76IjM4&a  
 CDialog::DoDataExchange(pDX); C!,|Wi2&  
 //{{AFX_DATA_MAP(CAboutDlg) )By #({O  
 //}}AFX_DATA_MAP !+R_Z#gB  
} r<)>k.] !  
][D/=-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V^S` d8?  
 //{{AFX_MSG_MAP(CAboutDlg) (~k{aO  
 // No message handlers |$^a"Yd`9  
 //}}AFX_MSG_MAP BYuoeN!  
END_MESSAGE_MAP() ^RIDC/B=V6  
,ma4bqRMc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !tuN_  
: CDialog(CCaptureDlg::IDD, pParent)  b79z<D  
{ g$?kL  
 //{{AFX_DATA_INIT(CCaptureDlg) wC&+nS1  
  m_bControl = FALSE; v % c-El%  
  m_bAlt = FALSE; xZE%Gf_U  
  m_bShift = FALSE; aG*Mj;J  
  m_Path = _T("c:\\"); +uqP:z  
  m_Number = _T("0 picture captured."); F/ si =%  
  nCount=0; pw, <0UhV  
  bRegistered=FALSE; i3dV2^O  
  bTray=FALSE; a_V.mu6h6p  
 //}}AFX_DATA_INIT !C6[m1F  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^X\{MW'>4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V#Pz `D  
} (_ TKDx_  
qA;!Pql`  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y+aL5$x6  
{ U L3++bt  
 CDialog::DoDataExchange(pDX); c{(4s6D  
 //{{AFX_DATA_MAP(CCaptureDlg) B k yW  
  DDX_Control(pDX, IDC_KEY, m_Key); K lbUs\E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _N1UL?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #cCR\$-~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L"x9O'U  
  DDX_Text(pDX, IDC_PATH, m_Path); TBU.%3dEyI  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1RU+d.&D  
 //}}AFX_DATA_MAP znq/ %7  
} i_' u:P<t  
KQu lz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  \LP?,<  
//{{AFX_MSG_MAP(CCaptureDlg) 4*9WxhJ ]0  
 ON_WM_SYSCOMMAND() 6 _n~E e  
 ON_WM_PAINT() 1cdX0[sN  
 ON_WM_QUERYDRAGICON() oMV^W^<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -<Oy5N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?ISv|QpC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %CaF-m=Pq  
//}}AFX_MSG_MAP x6iT"\MO  
END_MESSAGE_MAP() K /A1g.$  
kf -/rC)>  
BOOL CCaptureDlg::OnInitDialog() j"Y5j B`  
{ d{FD.eI 0  
 CDialog::OnInitDialog(); >XU93 )CX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @\)a&p]a  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y(97},  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;)rs#T;$  
 if (pSysMenu != NULL) g@s'-8}X^  
 { ,/1[(^e  
  CString strAboutMenu; ".|?A9m_  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  XKEbK\  
  if (!strAboutMenu.IsEmpty()) @7z_f!'u  
  { EG oe<.  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6i=Nk"d  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /OsTZ"*.2/  
  }  1k39KO@  
 } ]/TqPOi:  
 SetIcon(m_hIcon, TRUE); // Set big icon  $hgsWa  
 SetIcon(m_hIcon, FALSE); // Set small icon y0b FzR9  
 m_Key.SetCurSel(0); <pp<%~_Z  
 RegisterHotkey(); X)^&5;\`  
 CMenu* pMenu=GetSystemMenu(FALSE); \CKf/:"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a";xG,U  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); !<AY0fpY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); g| M@/D l  
 return TRUE; // return TRUE unless you set the focus to a control ^hIKDc!.m  
} 67b[T~92o  
!vwx0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f%ynod8  
{ 5;yVA  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y:3\z?oV[  
 { FZJyqqA$_  
  CAboutDlg dlgAbout; 38HnW  
  dlgAbout.DoModal(); 6JZ$; x{j  
 } 6~y7A<[^  
 else w@Gk#  
 { :d`8:gv?  
  CDialog::OnSysCommand(nID, lParam); 6H:'_|G  
 } Xw<5VIAHm;  
} bR&<vrMmrA  
FK!UUy;  
void CCaptureDlg::OnPaint() )WR*8659e  
{ dq U.2~9  
 if (IsIconic()) *JmU",X  
 { <Q%:c4N  
  CPaintDC dc(this); // device context for painting ?[~)D}] j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x}*Y =Xh  
  // Center icon in client rectangle vo3[)BDbT  
  int cxIcon = GetSystemMetrics(SM_CXICON); -7\6j#;l  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;DN:AgXP  
  CRect rect; OK1f Y`$z  
  GetClientRect(&rect); /&Vgo ~.J  
  int x = (rect.Width() - cxIcon + 1) / 2; a"|\n_  
  int y = (rect.Height() - cyIcon + 1) / 2; u*C"d1v=  
  // Draw the icon C~([aH@-I  
  dc.DrawIcon(x, y, m_hIcon); ab-MEN`5  
 } sXmo.{Ayb  
 else y |0I3n]e  
 { /@~&zx&_  
  CDialog::OnPaint(); Xy'qgK?  
 } ukH?O)0O  
} *iW$>Yjb  
M!E#T-)  
HCURSOR CCaptureDlg::OnQueryDragIcon() |Je+y;P7  
{ M_monj}Z  
 return (HCURSOR) m_hIcon; eOI#T'5  
}  cojbuo  
my(yN|  
void CCaptureDlg::OnCancel() 9b}AZ]$  
{ xB&6f")  
 if(bTray) .wv!;  
  DeleteIcon(); va_TC!{;  
  CDialog::OnCancel(); W2 ([vRT  
} ok+-#~VTn  
. 7EZB  
void CCaptureDlg::OnAbout() &ivPY  
{ }bxx]rDl  
 CAboutDlg dlg; fpK`  
 dlg.DoModal(); =P"Sm r  
} Z" !+p{u  
68v59)0U  
void CCaptureDlg::OnBrowse() c6NCy s  
{ >|e>=  
 CString str; 9v2(cpZ  
 BROWSEINFO bi; [Y^1}E*  
 char name[MAX_PATH]; <fLk\ =  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); I$7TnMug  
 bi.hwndOwner=GetSafeHwnd(); 6qgII~F'  
 bi.pszDisplayName=name; D;l)&"|r?  
 bi.lpszTitle="Select folder"; LN?b6s75U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^M Zdht   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9+sOSz~ P  
 if(idl==NULL) k-M-=VvA  
  return; b[I;6HW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2r]!$ hto  
 str.ReleaseBuffer(); rLm:qu(F1  
 m_Path=str; dGb]`*E  
 if(str.GetAt(str.GetLength()-1)!='\\') c*"TmDY  
  m_Path+="\\"; s3LR6Z7;i  
 UpdateData(FALSE); &_!g|-  
} fDa$TbhjI  
Cq0S8Or0  
void CCaptureDlg::SaveBmp() \I4*|6kA  
{ ;_^ "}  
 CDC dc; (n~ e2tZ/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7 i |_PP_  
 CBitmap bm; ;7]Q'N  
 int Width=GetSystemMetrics(SM_CXSCREEN); u/h!i@_w[  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2 #+g4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); VK)K#!O8  
 CDC tdc; 5_mb+A n,  
 tdc.CreateCompatibleDC(&dc); 1Jx|0YmO  
 CBitmap*pOld=tdc.SelectObject(&bm); Kb#}f/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3GSoHsNk  
 tdc.SelectObject(pOld); Ye8&cZ*.  
 BITMAP btm; vkXdKL(q  
 bm.GetBitmap(&btm); Va1 eG]jQ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L/.$0@$bv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); mmVx',k  
 BITMAPINFOHEADER bih; z <"7vR  
 bih.biBitCount=btm.bmBitsPixel; h4GR:`  
 bih.biClrImportant=0; 2Q,8@2w;  
 bih.biClrUsed=0; :K3nJ1G&  
 bih.biCompression=0; oR=^NEJv  
 bih.biHeight=btm.bmHeight; Q1Jkt  
 bih.biPlanes=1; 3}H"(5dL}z  
 bih.biSize=sizeof(BITMAPINFOHEADER); ve #cz2Z  
 bih.biSizeImage=size; kd9GHN;7  
 bih.biWidth=btm.bmWidth; Ge|& H]W  
 bih.biXPelsPerMeter=0; RPvOup  
 bih.biYPelsPerMeter=0; !@_( W   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jG3}V3|.  
 static int filecount=0; S"iQQV{)Z  
 CString name; "=unDpq]  
 name.Format("pict%04d.bmp",filecount++); I54O9Aoy  
 name=m_Path+name; FRicHs n  
 BITMAPFILEHEADER bfh; fWR]L47n  
 bfh.bfReserved1=bfh.bfReserved2=0; O/IW.t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qO<'_7TN[  
 bfh.bfSize=54+size; xy% lp{  
 bfh.bfOffBits=54; =#i#IF42?  
 CFile bf; j${:Y$VmE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _[SP*" ]H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); eo4<RDe<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); d0b--v/  
  bf.WriteHuge(lpData,size); 62}bs/%  
  bf.Close(); &Z+a (  
  nCount++; JlF0L%Rc  
 } %<e\s6|P:  
 GlobalFreePtr(lpData); Q~4o{"3.'  
 if(nCount==1) !}()mrIlP  
  m_Number.Format("%d picture captured.",nCount); Z;@F.r  
 else t Ib?23K0  
  m_Number.Format("%d pictures captured.",nCount); T[=XGAJ  
  UpdateData(FALSE); <G59>H5  
} a$MMp=p  
 ]D7z&h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xXK7i\ny  
{ HnVUG4yZTD  
 if(pMsg -> message == WM_KEYDOWN) }Kq5!XJV9C  
 { :&dY1.<N+  
  if(pMsg -> wParam == VK_ESCAPE) j>M 'nQ,;d  
   return TRUE; _tQ=ASe0  
  if(pMsg -> wParam == VK_RETURN) /n7F]Ok'*  
   return TRUE; *?gn@4Ly  
 } /D_8uTS>d[  
 return CDialog::PreTranslateMessage(pMsg); #UC4l]Ru A  
} fp9ksxb@m  
Z{/C4" F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `^s(r>2  
{ ?x@BZe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M6!kn~  
  SaveBmp(); gtz!T2%  
  return FALSE; 5/mW:G,&  
} "HVwm>qEi  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B[-%A!3 F  
 CMenu pop; )F<<M+q=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g?(Z+w4A 3  
 CMenu*pMenu=pop.GetSubMenu(0); 5JI+42S \  
 pMenu->SetDefaultItem(ID_EXITICON); BoP%f '0N  
 CPoint pt; j2#Vdw|j  
 GetCursorPos(&pt); qo.~5   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6(oGU4  
 if(id==ID_EXITICON) -nO('(t  
  DeleteIcon(); uavts9v<  
 else if(id==ID_EXIT) 7(~^6Ql!  
  OnCancel(); 96vv85g  
 return FALSE; 3OFv_<6  
} p7!q#o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G4s!q1H  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `S<uh9/  
 AddIcon(); (H+'sf^h  
 return res; 5Zn3s()  
} vsoj] R$C  
[_qBp:_j?s  
void CCaptureDlg::AddIcon() I~"-  
{ \,JRNL&   
 NOTIFYICONDATA data; /Os)4yH\  
 data.cbSize=sizeof(NOTIFYICONDATA); s Xl7  
 CString tip; 8pDJz_F!{  
 tip.LoadString(IDS_ICONTIP); .Rc&EO  
 data.hIcon=GetIcon(0); "S[VtuxPCU  
 data.hWnd=GetSafeHwnd(); "SyyOD )WA  
 strcpy(data.szTip,tip); nH% /  
 data.uCallbackMessage=IDM_SHELL; y~1UU3k5  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ft`#]=IS  
 data.uID=98; yN~=3b>  
 Shell_NotifyIcon(NIM_ADD,&data); "6pjkEt4  
 ShowWindow(SW_HIDE); ;pb~Zk/[,w  
 bTray=TRUE; 8.jd'yp*J  
} V* fDvr0  
&66G  
void CCaptureDlg::DeleteIcon() uz Z|w+3O  
{ GWA_,/jS%  
 NOTIFYICONDATA data; fylW)W4C  
 data.cbSize=sizeof(NOTIFYICONDATA); fdd3H[  
 data.hWnd=GetSafeHwnd(); ]$nJn+85@b  
 data.uID=98; s&y  
 Shell_NotifyIcon(NIM_DELETE,&data); 4_t aCK  
 ShowWindow(SW_SHOW); =q[3/'2V$?  
 SetForegroundWindow(); zK:/ 1  
 ShowWindow(SW_SHOWNORMAL); |ki#MtCp  
 bTray=FALSE; gNLjk4H,S[  
} X^9_'T9  
pPh_p @3I  
void CCaptureDlg::OnChange()  IO>Cyo  
{ R) @ k|  
 RegisterHotkey(); d-N<VVcy\  
} ])~*)I~Y  
Q6%m}R  
BOOL CCaptureDlg::RegisterHotkey() K]kL?-A#'  
{ %F&j B  
 UpdateData(); fb`VYD9[^  
 UCHAR mask=0; qI;k2sQR  
 UCHAR key=0; "VcGr#zW  
 if(m_bControl) hUA3(!0)  
  mask|=4; C _[jQTr  
 if(m_bAlt) Q1&: +7 %  
  mask|=2; Q:-H U bB  
 if(m_bShift) >PySd"u  
  mask|=1; |.(o4<nx.  
  key=Key_Table[m_Key.GetCurSel()]; |nD2k,S<?  
 if(bRegistered){ {,s:vPoiA  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 'Q(A5zfN]Y  
  bRegistered=FALSE; Fl*@@jQ8cV  
 } !k<+-Lf:2  
 cMask=mask; X dB#+"[  
 cKey=key; KD Qux  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <hy>NM@$  
 return bRegistered; HSK^vd?_l  
} p2&KGt X'  
gdCU1D\  
  四、小结 {_[l,tdZ  
3\mFK$#sr  
  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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