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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: W3vi@kb]  
  pME{jD  
  一、实现方法 [S.ZJUns  
<PPNhf8  
  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: ^l^fD t  
-U<Upn)2  
#pragma data_seg("shareddata") >@WX>0`ht  
HHOOK hHook =NULL; //钩子句柄 [s9O0i" Y  
UINT nHookCount =0; //挂接的程序数目 6:U$w7P0 e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O\K_q7iO6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ze_{=Cv&Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,D\GGRw  
static int KeyCount =0; EF pIp4_Y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 hlu:=<B  
#pragma data_seg()  hjO*~  
bifS 2>c  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 #`GY}-hL!  
f<+ 4rHT  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: h8\  T  
QKN<+,h!z>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @ S<-d  
cKey,UCHAR cMask) :16P.z1L  
{ V{|}}b?w?  
 BOOL bAdded=FALSE; KXV[OF&J  
 for(int index=0;index<MAX_KEY;index++){ <Sz52Suh>  
  if(hCallWnd[index]==0){ ;"O&X<BX-  
   hCallWnd[index]=hWnd; 0-LpqX  
   HotKey[index]=cKey; Q'k\8'x  
   HotKeyMask[index]=cMask; >5R <;#8  
   bAdded=TRUE; {;2vmx9  
   KeyCount++; -XRn~=5   
   break; |QV!-LK  
  } 2F%W8Y 3  
 } /-6S{hl9Ne  
 return bAdded; 64-#}3zL  
} a[lY S{  
//删除热键 O]f/r,4@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H _Va"yTO6  
{ gyS+9)gY  
 BOOL bRemoved=FALSE; .I}:m%zv  
 for(int index=0;index<MAX_KEY;index++){ B2Xn?i3 l  
  if(hCallWnd[index]==hWnd){ 8q`$y$06Dk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1<ro7A4hK  
    hCallWnd[index]=NULL; i&8FBV-  
    HotKey[index]=0; 1 nvTce  
    HotKeyMask[index]=0; (Qgde6  
    bRemoved=TRUE; c*d 9'}E  
    KeyCount--; jlFk@:y4  
    break; IlX$YOf4  
   } \D>$aLO*?  
  } = 07Gy,=i  
 } ~x{.jn  
 return bRemoved; 7u\*_mrv  
} ?S?2 0  
,3I^?5  
eT'nl,e|  
  DLL中的钩子函数如下: pj?XLiM54%  
4/ X/>Y1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Lp5U"6y  
{ J8y0d1SG  
 BOOL bProcessed=FALSE; B= keBO](@  
 if(HC_ACTION==nCode) M8k"je7`s  
 { S' dV>m`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "l={)=R  
   switch(wParam) BQ^H? jo  
   {  s<x1>Q7X~  
    case VK_MENU: QrApxiw  
     MaskBits&=~ALTBIT; kF7(f|*  
     break; .^) UO  
    case VK_CONTROL: .I3?7  
     MaskBits&=~CTRLBIT; hVj NZ  
     break; = sAn,ri  
    case VK_SHIFT: %hlspI(J  
     MaskBits&=~SHIFTBIT; $ _8g8r}  
     break; K; FW  
    default: //judge the key and send message (2?G:+C 7  
     break; x*oWa,  
   } >-E<n8  
   for(int index=0;index<MAX_KEY;index++){ `"vZ);i <  
    if(hCallWnd[index]==NULL) dBO@6*N4c  
     continue; iE0ab,OF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sqx` ">R  
    { AvR2_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JT[*3 h  
     bProcessed=TRUE; 9Pd* z>s  
    } 4 !`bZ`_Bw  
   } H* !EP  
  } ^s\3/z>b4!  
  else if((lParam&0xc000ffff)==1){ //有键按下 - ~O'vLG  
   switch(wParam) u% 2<\:~j  
   { }4c o)B"  
    case VK_MENU: o/ [  
     MaskBits|=ALTBIT; ! BU)K'mj  
     break; @|bP+8oU  
    case VK_CONTROL: 33:DH}  
     MaskBits|=CTRLBIT; P+e KZo  
     break;  &O[s:  
    case VK_SHIFT: fYebB7Pv  
     MaskBits|=SHIFTBIT; 3L-^<'~-k;  
     break; 'f?.R&sCA  
    default: //judge the key and send message %R_{1GrL'c  
     break; 8F;>5i  
   } ~7quTp)  
   for(int index=0;index<MAX_KEY;index++){ B~r}c4R{7  
    if(hCallWnd[index]==NULL) #nyv+x;  
     continue; dOa!htx]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5,+\`!g  
    { )"@t6.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jy$@a%FD  
     bProcessed=TRUE; g%J./F=@3  
    } %j]ST D.E  
   } I{.HO<$7D}  
  } vX1uR]A[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 T@+ClZi  
   for(int index=0;index<MAX_KEY;index++){ o 5Zyh26  
    if(hCallWnd[index]==NULL) ?_4^le[;  
     continue; p]LnE `v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :uCdq`SaQl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /J%do]PDl  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4_Rdp`x#J  
   } 9{J?HFw*;  
  } U~is-+Uq  
 } 9 pKm*n&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); l)}t,!M6  
} 1t~({Pl<>  
`q?RF+  
  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: k&Jo"[i&WO  
T&}Ye\%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $4j^1U`~)K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P.4E{.)(  
jn=ug42d  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 19y 0$e_V  
lSCY5[?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E2:D(7(;l  
{ K+ehr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) z-Hkz  
 { &+;uZ-x  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _"f<Ol[!  
  SaveBmp(); ,VG9)K 1K  
  return FALSE; S:97B\ u`  
 } wixD\t59X  
 …… //其它处理及默认处理 Fzs>J&sY&  
} ,V2#iY.%}N  
:uR>UDlPX  
&t[|%c*D&  
  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。 ABiC9[Q0  
%Rn:G K  
  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。 {{zua- F  
/$*; >4=>f  
  二、编程步骤 /'`6 ; uRN  
#Y: ~UVV  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; yA0Y 14\*  
;_bq9x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z (#Xca  
EFNdiv$wF  
  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; ]TfeBX6ST  
Si[eAAd' :  
  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; 1l~.R#WG&  
z=%IcSx;  
  5、 添加代码,编译运行程序。 {Ot[WF  
m^Rd Iy)  
三、程序代码 h+ TB]  
FBbm4NB  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL J;"nm3[.q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \|Y{jG<cu  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "1CGO@AXS  
#if _MSC_VER > 1000 u4C1W|x  
#pragma once }o{!}g9  
#endif // _MSC_VER > 1000 JN)"2}SE  
#ifndef __AFXWIN_H__ B ;;cbY  
#error include 'stdafx.h' before including this file for PCH P$ F#,Cn  
#endif xz="|HD);  
#include "resource.h" // main symbols QZ:v  
class CHookApp : public CWinApp ;7)OSGR  
{ AV9:O{  
 public: )*+u\x_Hx  
  CHookApp(); XuA0.b%  
  // Overrides e ^-3etx  
  // ClassWizard generated virtual function overrides ul}4p{ m[  
  //{{AFX_VIRTUAL(CHookApp) vN' VDvVM  
 public: bQ i<0|S  
  virtual BOOL InitInstance(); ./2Z?,  
  virtual int ExitInstance(); US"2O!u  
  //}}AFX_VIRTUAL rg"TJ"Q-  
  //{{AFX_MSG(CHookApp) J~fuW?a]r  
  // NOTE - the ClassWizard will add and remove member functions here. 5=Zp%[ #  
  // DO NOT EDIT what you see in these blocks of generated code ! {W]bU{%.  
  //}}AFX_MSG v5P*<U Ax  
  DECLARE_MESSAGE_MAP() /1H9z`qV  
}; rn[$x(G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,WzG.3^m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +q$xw}+PK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _ Eszr(zJ  
BOOL InitHotkey(); j #4+-  
BOOL UnInit(); ,K`E&hS  
#endif <tGI]@Nwk  
sf<Q#ieTxY  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Ixyvn#ux )  
#include "stdafx.h" Bd/} %4V\@  
#include "hook.h" N,h1$)\B#  
#include <windowsx.h> ?hP<@L6K  
#ifdef _DEBUG i#Ne'q;T  
#define new DEBUG_NEW ll 6]W~[ZC  
#undef THIS_FILE EaJDz`T}  
static char THIS_FILE[] = __FILE__; (ej:_w1  
#endif M ,Zm|3L  
#define MAX_KEY 100 .ou!g&xu  
#define CTRLBIT 0x04 BGh8\2  
#define ALTBIT 0x02 hc p'+:  
#define SHIFTBIT 0x01 sVm'9k  
#pragma data_seg("shareddata") (EF$^FYPK  
HHOOK hHook =NULL; I;":O"ij\  
UINT nHookCount =0; |)P;%Fy9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^x1D]+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT x+)hL D[ n  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <4A(Z$ZX)  
static int KeyCount =0; gQ+_&'C  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j|$y)FBX  
#pragma data_seg() Lw2YP[CR  
HINSTANCE hins; E/ed0'|m  
void VerifyWindow(); XGrxzO|{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  C>K"ZJ  
//{{AFX_MSG_MAP(CHookApp) Z5^,!6  
// NOTE - the ClassWizard will add and remove mapping macros here. ?[>BssW  
// DO NOT EDIT what you see in these blocks of generated code! :#!F 7u  
//}}AFX_MSG_MAP $gD(MKR)~  
END_MESSAGE_MAP() ;Wrd=)Ka  
s)&R W#:X  
CHookApp::CHookApp() =ILo`Q~  
{ <812V8<!  
 // TODO: add construction code here, T?}=k{C]  
 // Place all significant initialization in InitInstance =L; n8~{@y  
} A`8}J4  
~zOU/8n ,F  
CHookApp theApp; o'}Z!@h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qI%9MI;BV  
{ QX~72X=(  
 BOOL bProcessed=FALSE; Hd@T8 D*A  
 if(HC_ACTION==nCode) cJE>;a  
 { Xk fUPbU  
  if((lParam&0xc0000000)==0xc0000000){// Key up f.xSr!  
   switch(wParam) RV@(&eM  
   {  D]>86&  
    case VK_MENU: T6?d`i i1  
     MaskBits&=~ALTBIT; 6V_5BpXt  
     break; Pc:'>,3!V3  
    case VK_CONTROL: ~(doy@0M  
     MaskBits&=~CTRLBIT; FU v)<rK  
     break; $YO]IK$  
    case VK_SHIFT: 6I.+c  
     MaskBits&=~SHIFTBIT; '~6CGqU*  
     break; 0PX@E-n  
    default: //judge the key and send message 1ZH8/1gWI  
     break; x:wq"X  
   } 1XKIK(l  
   for(int index=0;index<MAX_KEY;index++){ YwTtI ID%  
    if(hCallWnd[index]==NULL) UtW3KvJ#=  
     continue; _f2iz4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1~iBzPU2  
    { { dx yBDK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Hn2Q1lF-ip  
     bProcessed=TRUE; _xwfz]lb+  
    } <qj@waKw4  
   } KqIe8bi^G  
  } gRd1(S  
  else if((lParam&0xc000ffff)==1){ //Key down tp3N5I  
   switch(wParam) I Y-5/  
   { :95_W/l  
    case VK_MENU: -8J@r2\  
     MaskBits|=ALTBIT; mp$II?hZ*  
     break; Rn ^N+3o'M  
    case VK_CONTROL: Mh B=+S[@  
     MaskBits|=CTRLBIT; ?=o]Wx0(9  
     break; HOI`F3#XI  
    case VK_SHIFT: sN/Xofh  
     MaskBits|=SHIFTBIT; '$nGtB5  
     break; -kS5mR  
    default: //judge the key and send message T//+&Sk[  
     break; /]58:euR  
   } G!lykk]  
   for(int index=0;index<MAX_KEY;index++) /u1zRw  
   { GnHf9 JrR  
    if(hCallWnd[index]==NULL) W${sD|d-  
     continue; wx7>0[zE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KD<`-b)7<  
    { 8pKPbi;(2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !LSWg:Ev+  
     bProcessed=TRUE; #z5?Y2t7~^  
    } _5 -"<  
   } e/~<\  
  } wA+4:CF @  
  if(!bProcessed){ VFp)`+8  
   for(int index=0;index<MAX_KEY;index++){ RR {9  
    if(hCallWnd[index]==NULL) 2MrR|hLx  
     continue; "tbBbEj?d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \DdVMn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?4dd|n  
   } &%51jM<  
  } ^Q:`2C5  
 } H zK=UcD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \}(-9dr  
} obkv ]~  
a'.=.eDQ  
BOOL InitHotkey() \shoLp   
{ 5%$kAJZC-  
 if(hHook!=NULL){ <t2?Oii;  
  nHookCount++; D#(Pg  
  return TRUE; g5]DA.&(  
 } *\5H\s9<  
 else blS4AQ?b^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A}}t86T  
  if(hHook!=NULL) O$ oN1  
   nHookCount++; ;L{y3CWT  
  return (hHook!=NULL); ?AH<y/i<Y  
} Yhdt8[ 2  
BOOL UnInit() $ O>MV  
{ k.hSN8  
 if(nHookCount>1){ gKEvgXOj  
  nHookCount--; V3nv5/6  
  return TRUE; 7[,f;zG  
 } unB "dE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); XX+rf  
 if(unhooked==TRUE){ 'Pn`V{a  
  nHookCount=0; 1%{(?uz9  
  hHook=NULL; F.w#AV  
 } ,*#M%Pv1t  
 return unhooked; z(a:fL{/XG  
} g7ROA8xu  
P,], N)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /FXfu  
{ &Vm[5XW  
 BOOL bAdded=FALSE; .5zJ bZ9  
 for(int index=0;index<MAX_KEY;index++){ ;]e"bX  
  if(hCallWnd[index]==0){ V)@scB|>,  
   hCallWnd[index]=hWnd; N($]))~3&  
   HotKey[index]=cKey; =sJHnWL[  
   HotKeyMask[index]=cMask; [C#pMLp,~  
   bAdded=TRUE; =1uI >[aN  
   KeyCount++; Np)!23 "  
   break; B)iJH  
  } -4a&R=%p  
 } YRXe j  
 return bAdded; l#:Q V:  
} r#}%sof  
 ,1kV9_x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9tgkAU`  
{ ZaV@}=Rd8  
 BOOL bRemoved=FALSE; w|ei*L  
 for(int index=0;index<MAX_KEY;index++){ [!$>:_Vq/  
  if(hCallWnd[index]==hWnd){ \/G Y0s  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ld6@&34  
    hCallWnd[index]=NULL; W6>uLMUa  
    HotKey[index]=0; l\GNd6)H  
    HotKeyMask[index]=0; r3)t5P*_  
    bRemoved=TRUE; %dQX d ]  
    KeyCount--; w,$17+]3  
    break; @ vudeaup  
   } [Hf FC3U  
  } G)`MoVH1  
 } #v<+G=r*O  
 return bRemoved; gr7_oJ:R  
} &0TheY;srf  
_69\#YvCG  
void VerifyWindow() "+60B0>sc  
{ ^u74WN  
 for(int i=0;i<MAX_KEY;i++){ =+WFx3/  
  if(hCallWnd!=NULL){ 'r0gqtB  
   if(!IsWindow(hCallWnd)){ `w }"0+V  
    hCallWnd=NULL; >?V->7QLP  
    HotKey=0; _!D$Aj  
    HotKeyMask=0; Ky|0IKE8Z  
    KeyCount--; |szfup~5es  
   } VN;M;fMs  
  } u,q#-d0g;  
 } ZvJx01F{  
} jTIn@Q  
x(~l[hT  
BOOL CHookApp::InitInstance() G[ea@u$?  
{ /cn_|DwN5  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k[m-"I%ZFX  
 hins=AfxGetInstanceHandle(); b/`' ?| C  
 InitHotkey(); j|9 2 g  
 return CWinApp::InitInstance(); I1jF`xQ&0  
} Q[^d{e*l  
bx> D  
int CHookApp::ExitInstance() "M]]H^r5  
{ zrM|8Cu  
 VerifyWindow(); im"v75 tc  
 UnInit(); U# gmk0>t{  
 return CWinApp::ExitInstance(); Zuf&maa S  
} 4a~_hkY]  
+{Ttv7l_2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,q1RJiR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FE.:h'^h  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K9iR>put  
#if _MSC_VER > 1000 (A_9;uL^_  
#pragma once 5q[@N  J  
#endif // _MSC_VER > 1000 N 2\,6<  
1^mO"nX  
class CCaptureDlg : public CDialog l0f6Lxfz  
{ $I%]jAh6  
 // Construction .*{LPfD|  
 public: C;|Ru*  
  BOOL bTray; [o6d]i!  
  BOOL bRegistered; ~}fpe>M:  
  BOOL RegisterHotkey(); q.4DwY5 L  
  UCHAR cKey; b%6 _LK[  
  UCHAR cMask; ,==lgM2V>  
  void DeleteIcon(); <Z Ls+|1  
  void AddIcon(); BH^q.p_#>X  
  UINT nCount; V Puzu|  
  void SaveBmp(); \} 5\^&}_  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor |ONOF  
  // Dialog Data }N NyUwFa  
  //{{AFX_DATA(CCaptureDlg) tQ"PCm  
  enum { IDD = IDD_CAPTURE_DIALOG }; Sk xaSJ"  
  CComboBox m_Key; #+$z`C`  
  BOOL m_bControl; W-MQMHQ  
  BOOL m_bAlt; !Iqyt. .  
  BOOL m_bShift; LdL< 5Q[  
  CString m_Path; /}wGmX! -!  
  CString m_Number; ygHNAQG~  
  //}}AFX_DATA dJk.J9Z  
  // ClassWizard generated virtual function overrides hk(^?Fp  
  //{{AFX_VIRTUAL(CCaptureDlg) HDYoM  
 public: 6k-]2,\#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); n:{yri+  
 protected: gg=z.`}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 98l#+4 +  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '` n\YO.N  
  //}}AFX_VIRTUAL ufmFeeg  
  // Implementation y9 "!ys  
 protected: zPn8>J<.0Q  
  HICON m_hIcon; |dvcDx0|K  
  // Generated message map functions "dIoIW  
  //{{AFX_MSG(CCaptureDlg) (q utgnW  
  virtual BOOL OnInitDialog(); ),86Y:^4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Mw< 1  
  afx_msg void OnPaint(); ~dv C$   
  afx_msg HCURSOR OnQueryDragIcon(); IaW8  
  virtual void OnCancel(); ?AR6+`0  
  afx_msg void OnAbout(); 4&tY5m>  
  afx_msg void OnBrowse(); )<+Z,6  
  afx_msg void OnChange(); ) E5ax~  
 //}}AFX_MSG Xa36O5$4]9  
 DECLARE_MESSAGE_MAP() j&F&wRD%r  
}; umc!KOkL  
#endif 4JucNGv  
/%~`B[4F  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FYzl-7!Y  
#include "stdafx.h" GerZA#  
#include "Capture.h" 0=~Ji_5mB  
#include "CaptureDlg.h" Zu!3RN[lp?  
#include <windowsx.h> R6ywc "xE  
#pragma comment(lib,"hook.lib") M C>{I3  
#ifdef _DEBUG Zscmc;G  
#define new DEBUG_NEW W /IyF){  
#undef THIS_FILE 8<xJmcTEwO  
static char THIS_FILE[] = __FILE__; 3+IS7ATn  
#endif ~{xY{qL  
#define IDM_SHELL WM_USER+1 C0e< _6p=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &#~yci2{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); | r2'B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O *CKyW_$t  
class CAboutDlg : public CDialog [qc90)^Q,  
{ wEk9(|  
 public: /#blXI  
  CAboutDlg(); p< XjiRq  
  // Dialog Data dz?:)5>I  
  //{{AFX_DATA(CAboutDlg) zg]9~i8  
  enum { IDD = IDD_ABOUTBOX }; 'EXp[*  
  //}}AFX_DATA I\":L  
  // ClassWizard generated virtual function overrides Ltc>@  
  //{{AFX_VIRTUAL(CAboutDlg) o|*,<5t  
 protected: ${ e{#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ? ;\YiOTda  
  //}}AFX_VIRTUAL z`{x1*w_  
  // Implementation yQ\c<z^e  
 protected: rN OwB2e  
  //{{AFX_MSG(CAboutDlg) V<1dA\I"  
  //}}AFX_MSG LqW~QEU(  
  DECLARE_MESSAGE_MAP() \SyfEcSf2v  
}; nlh%O@,  
?'^xO:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,w c|YI)E  
{ ! @|"84  
 //{{AFX_DATA_INIT(CAboutDlg) K@+&5\y]  
 //}}AFX_DATA_INIT (Ys 0|I3  
} ^,,|ED\M{m  
&6h,'U  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uV{cvq$jy  
{ &r jMGk"&  
 CDialog::DoDataExchange(pDX); .#CTL|x  
 //{{AFX_DATA_MAP(CAboutDlg) s %/3X\_  
 //}}AFX_DATA_MAP 5E4np`J  
} IpHGit28  
(tys7og$'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _K'YaZTa;~  
 //{{AFX_MSG_MAP(CAboutDlg) <.#i3!  
 // No message handlers fi`*r\  
 //}}AFX_MSG_MAP C4ge_u#  
END_MESSAGE_MAP() ``U>9S"p)  
MK,#"Ty}zK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U",kAQY  
: CDialog(CCaptureDlg::IDD, pParent) {o AJL  
{ o[aRG7C  
 //{{AFX_DATA_INIT(CCaptureDlg) fE,\1LK4  
  m_bControl = FALSE; c.r]w  
  m_bAlt = FALSE; z" 4$mh  
  m_bShift = FALSE; [WuN?H  
  m_Path = _T("c:\\"); 1ih|b8)Dn  
  m_Number = _T("0 picture captured."); 7iT#dpF/A  
  nCount=0; RWK|?FD\<  
  bRegistered=FALSE;  9/`T]s"  
  bTray=FALSE; W A-\2  
 //}}AFX_DATA_INIT 'jqkDPn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6ID@0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ZE#A?5lb  
} /a Nlr>^  
sZA7)Z`7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fn;`Vit#  
{ F{v>   
 CDialog::DoDataExchange(pDX); G,3.'S,7  
 //{{AFX_DATA_MAP(CCaptureDlg) $zKf>[K  
  DDX_Control(pDX, IDC_KEY, m_Key); ^O6* e]C$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4TRG.$2[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); SEF6B45}1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -5>NE35Cto  
  DDX_Text(pDX, IDC_PATH, m_Path); =AOWeLk*G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Xl%0/ o  
 //}}AFX_DATA_MAP Cg!^S(U4  
} or_+2aG  
c3xl9S,5  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) lDc;__}Ws  
//{{AFX_MSG_MAP(CCaptureDlg) . (`3JQ2s  
 ON_WM_SYSCOMMAND() lCb+{OB  
 ON_WM_PAINT() gPEqjj  
 ON_WM_QUERYDRAGICON() y,m2(V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H{fM%*w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6)*xU|fU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $=aI "(3&  
//}}AFX_MSG_MAP j9y3hQ+q  
END_MESSAGE_MAP() ?IYY'fS"  
$L}aQlA1JM  
BOOL CCaptureDlg::OnInitDialog() &ITuyGmF  
{ vRhnX  
 CDialog::OnInitDialog(); Hs?zq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c^.l 2Q!  
 ASSERT(IDM_ABOUTBOX < 0xF000); =-jD~rN4;P  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N$alUx*  
 if (pSysMenu != NULL) &M"ouy Zo9  
 { wH6u5*$p  
  CString strAboutMenu; ]=&L_(34  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z,f=}t[.Y  
  if (!strAboutMenu.IsEmpty()) &__DJ''+  
  { /"#4T^7&  
   pSysMenu->AppendMenu(MF_SEPARATOR); (ku5WWJ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I6w~H?ul@*  
  } B)=~8wsI:Z  
 } ($!KzxF3  
 SetIcon(m_hIcon, TRUE); // Set big icon rVryt<2:@r  
 SetIcon(m_hIcon, FALSE); // Set small icon :FQ1[X1 xm  
 m_Key.SetCurSel(0); rT7^-B*  
 RegisterHotkey(); |V&G81sM  
 CMenu* pMenu=GetSystemMenu(FALSE); @Hjea1@t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8X7{vN_3K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #hxyOq,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); WeT* C  
 return TRUE; // return TRUE unless you set the focus to a control M}F~_S0h  
} }ot"Sx\.  
5cfA;(H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,4@|1z{bfm  
{ +m$5a YX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #V_GOy1-  
 { m J  
  CAboutDlg dlgAbout; 2WCLS{@'  
  dlgAbout.DoModal(); :Jxh2  
 } $\\lx_)  
 else j, u#K)7{T  
 { )pgrl  
  CDialog::OnSysCommand(nID, lParam); `y!/F?o+!  
 } >-cfZ9{!  
} -l*g~7|j  
grcbH  
void CCaptureDlg::OnPaint() \cySWP[  
{ 'fW#7W  
 if (IsIconic()) Ka-p& Uv1<  
 { `~F5 wh~  
  CPaintDC dc(this); // device context for painting lF4u{B9DM  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  i g71/'D  
  // Center icon in client rectangle X>l*v\F9  
  int cxIcon = GetSystemMetrics(SM_CXICON); G*n2Ii  
  int cyIcon = GetSystemMetrics(SM_CYICON); j$@tK0P  
  CRect rect; `rFAZcEj%  
  GetClientRect(&rect); mP}#Ccji?  
  int x = (rect.Width() - cxIcon + 1) / 2; 9y]J/1#  
  int y = (rect.Height() - cyIcon + 1) / 2; 9'KonW  
  // Draw the icon (H#M<N  
  dc.DrawIcon(x, y, m_hIcon); &=q! Wdw~  
 } _a -]?R  
 else {BV4h%P]:  
 { XB\zkf_}Xc  
  CDialog::OnPaint(); 6Z! y  
 } 'ZHdV,dd  
} ; st\I  
u?0d[mC  
HCURSOR CCaptureDlg::OnQueryDragIcon() k*$3i  
{ Z[L5 ;  
 return (HCURSOR) m_hIcon; H5xzD9K;/C  
} x0+glQrNN  
LI W*4r!  
void CCaptureDlg::OnCancel() iS: #o>  
{ P%>?[9!Nt  
 if(bTray) NoDZ5Z  
  DeleteIcon(); 0!#; j{JQ  
  CDialog::OnCancel(); hx!7w}[A  
} (4+1lOd  
P:!)9/.2  
void CCaptureDlg::OnAbout() C7qYiSv  
{ S*t%RZ~a  
 CAboutDlg dlg; ujzW|HW^v  
 dlg.DoModal(); ;#QhQx  
} cf;Ht^M\  
AtHS@p  
void CCaptureDlg::OnBrowse() uofLhy!  
{ f(Hu {c5yV  
 CString str; +=fKT,-*G!  
 BROWSEINFO bi; eBcJm  
 char name[MAX_PATH]; l5O=VqCj  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); o /p-!  
 bi.hwndOwner=GetSafeHwnd(); F[E? A95W  
 bi.pszDisplayName=name; 5cTY;@@  
 bi.lpszTitle="Select folder"; ^R_e  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @.9I3E-=  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `E>vG-9  
 if(idl==NULL) fE25(wCz7  
  return; Z9 w:&oa@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r0\f;q  
 str.ReleaseBuffer(); 5 2Hqu>  
 m_Path=str; TQ'E5^  
 if(str.GetAt(str.GetLength()-1)!='\\') Xr_pgW|  
  m_Path+="\\"; p@I9< ^"  
 UpdateData(FALSE); `wO}Hz  
} OyVm(%Z   
\ P/W8{  
void CCaptureDlg::SaveBmp() JP=ZUu  
{ g(m_yXIx  
 CDC dc; x)viY5vjH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); I:;+n^N?  
 CBitmap bm; ]b1Li}  
 int Width=GetSystemMetrics(SM_CXSCREEN); .Q\\dESn"  
 int Height=GetSystemMetrics(SM_CYSCREEN); DeQDH5X"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 3% vis\~^  
 CDC tdc; 4rp6 C/i  
 tdc.CreateCompatibleDC(&dc); ]VjLKFb~U  
 CBitmap*pOld=tdc.SelectObject(&bm); _z"o1`{w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <GZhH:  
 tdc.SelectObject(pOld); b! tludb  
 BITMAP btm;  WL-0(  
 bm.GetBitmap(&btm); 8(lCi$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;Bs^iL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "tR}j,=S:D  
 BITMAPINFOHEADER bih; 9k>uRV6  
 bih.biBitCount=btm.bmBitsPixel; )I9aC~eAD  
 bih.biClrImportant=0; {;n0/   
 bih.biClrUsed=0; uiMIz?+  
 bih.biCompression=0; p;->hn~D'5  
 bih.biHeight=btm.bmHeight; 5gK~('9'?1  
 bih.biPlanes=1; nCaLdj?  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5*j:K&R-.K  
 bih.biSizeImage=size; NMXM[Ukb  
 bih.biWidth=btm.bmWidth; {ymb\$f  
 bih.biXPelsPerMeter=0; r{ @ `o@q  
 bih.biYPelsPerMeter=0; (%DRt4u <H  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =K'L|QKF  
 static int filecount=0; s[V `e2O  
 CString name; l,y^HTc}7/  
 name.Format("pict%04d.bmp",filecount++); x0G>ktWq<  
 name=m_Path+name; 6>B \|  
 BITMAPFILEHEADER bfh; fPz=KoN  
 bfh.bfReserved1=bfh.bfReserved2=0; `:5,e/5,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !: |nI77|  
 bfh.bfSize=54+size; 8+(c1  
 bfh.bfOffBits=54; uUS)#qM |  
 CFile bf; :ICr\FY$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l1RlYl5  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `|,tCM&-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yJJ8 "s~i  
  bf.WriteHuge(lpData,size); X_?%A54z?  
  bf.Close(); az bUc4M  
  nCount++; Z;J`5=TS  
 } /v$]X4 S`  
 GlobalFreePtr(lpData); vKkf2 7  
 if(nCount==1) RKk"  
  m_Number.Format("%d picture captured.",nCount); &kx\W)  
 else .tp=T  
  m_Number.Format("%d pictures captured.",nCount); 7}07Pit  
  UpdateData(FALSE); 8S=c^_PJ  
} e7|d=W  
sZm^&h;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W-XN4:,qI  
{ 8A_TIyh?  
 if(pMsg -> message == WM_KEYDOWN) llqDT-cp  
 { Tw}z7U"  
  if(pMsg -> wParam == VK_ESCAPE) q]l\`/R%u  
   return TRUE; 0 r3N^_}  
  if(pMsg -> wParam == VK_RETURN) 8;.` {'r  
   return TRUE; 9OZ>y0)K~  
 } )$F6  
 return CDialog::PreTranslateMessage(pMsg); 1gAc,s2  
} z1qUz7  
05g?jV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) my=~"bw4  
{ -faw:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~ i'C/[P  
  SaveBmp(); R\ e#$"a5  
  return FALSE; 4ioN A/E  
} T ~|PU{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2dyxKK!\a  
 CMenu pop; _<Vg[ -:1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b)y<.pS\  
 CMenu*pMenu=pop.GetSubMenu(0); {4)5]62>u  
 pMenu->SetDefaultItem(ID_EXITICON); :z124Zf  
 CPoint pt; WiwwCKjSa  
 GetCursorPos(&pt); SmvwhX  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); x"!#_0TT}  
 if(id==ID_EXITICON) GiFf0c 9  
  DeleteIcon(); J ZNyC!u  
 else if(id==ID_EXIT) dr>]+H=3E  
  OnCancel(); cWc$ yE'  
 return FALSE; t5A[o7BS  
} /gF]s_  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); BDnBBbBrz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) EyPy*_A  
 AddIcon(); i&5!9m`Cw  
 return res; 9Mut p4#  
} 14;Av{Xt  
<WgG=Kf)N  
void CCaptureDlg::AddIcon() 6yi/&#YM  
{ :e52hK1[T  
 NOTIFYICONDATA data; -ca]Q|m8  
 data.cbSize=sizeof(NOTIFYICONDATA); 81cv:|"  
 CString tip; L1:}bH\y  
 tip.LoadString(IDS_ICONTIP); 5 u"nxT   
 data.hIcon=GetIcon(0); v.]'%+::#  
 data.hWnd=GetSafeHwnd(); iiQ||P}5  
 strcpy(data.szTip,tip); ^$6bs64FSm  
 data.uCallbackMessage=IDM_SHELL; =b|)Wnt2f  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; BD?F`%-x  
 data.uID=98; J$<:/^t  
 Shell_NotifyIcon(NIM_ADD,&data); ,at-ci\'  
 ShowWindow(SW_HIDE); <"{+  
 bTray=TRUE; 5auL<Pq   
} }]Qmt5'NI  
}% FDm@+  
void CCaptureDlg::DeleteIcon() bmSpbX\  
{ <w%Yq?^  
 NOTIFYICONDATA data; sCL/pb]  
 data.cbSize=sizeof(NOTIFYICONDATA); FC~|&  
 data.hWnd=GetSafeHwnd(); 18J.vcP  
 data.uID=98; JJ*0M(GG  
 Shell_NotifyIcon(NIM_DELETE,&data); XC 57];-  
 ShowWindow(SW_SHOW); 1h& )I%`?  
 SetForegroundWindow(); P=}H1 #  
 ShowWindow(SW_SHOWNORMAL); zl,bMtQ  
 bTray=FALSE; M55e=  
} %y!   
U3(L.8(sA  
void CCaptureDlg::OnChange() 8rnb  
{ )sMAhk|  
 RegisterHotkey(); AW]("pt  
} IZzhJK M1V  
EgkZ$ah  
BOOL CCaptureDlg::RegisterHotkey() Y^T-A}?`  
{ k?z [hZg0  
 UpdateData(); B6^w{eXN  
 UCHAR mask=0; %kaTQ"PB  
 UCHAR key=0; aEV|>K=6Y'  
 if(m_bControl) p]X!g  
  mask|=4; 4Q &Xb <  
 if(m_bAlt) ^p'D<!6sK  
  mask|=2; F%Ro98?{  
 if(m_bShift) _ +0uju?o}  
  mask|=1; fbi H   
  key=Key_Table[m_Key.GetCurSel()]; ".Tf< F  
 if(bRegistered){ )^V5*#69D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E5v|SFD  
  bRegistered=FALSE; j&o/X7I=  
 } l;"ub^AH  
 cMask=mask; pIM*c6  
 cKey=key; Oct\He\.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4Xa.r6T_N=  
 return bRegistered; ksxO<Y  
} 'Hcd&3a  
 oaH+c9v  
  四、小结 !W(/Y9g#  
e2,<,~_K6  
  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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