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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: X(rXRP#  
  `~"'\Hw  
  一、实现方法 v?}0h5  
kE8s])Z,+  
  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: qu dY9_  
VmN7a6a  
#pragma data_seg("shareddata") m<kJH<!j  
HHOOK hHook =NULL; //钩子句柄 yXv@yn  
UINT nHookCount =0; //挂接的程序数目 ~J> ;l s1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,d&3IhYhD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 IYXN}M.=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @:#J^CsM+'  
static int KeyCount =0; )*{B_[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -)3+/4Q(  
#pragma data_seg() p@uHzu7  
T!>hPg  
  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。 A9u>bWIE7  
JtxVF !v  
  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: EzjK{v">  
'@h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jw {B8<@s  
cKey,UCHAR cMask) ->.9[|lIg  
{ q(^iT~}  
 BOOL bAdded=FALSE; _KxR~k^  
 for(int index=0;index<MAX_KEY;index++){ I"x|U[*B  
  if(hCallWnd[index]==0){ (_>Su QK  
   hCallWnd[index]=hWnd; > /Q^.hzd  
   HotKey[index]=cKey; Kg"eS`-  
   HotKeyMask[index]=cMask; c$L1aZo  
   bAdded=TRUE; gO "G/  
   KeyCount++; ^_DwuY  
   break; Zv=pS (9  
  } $x]/|u/9  
 } "VSx?74q  
 return bAdded; Ak('4j!*}^  
} YM'4=BlJHv  
//删除热键 CI$z+ zN  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3oH/34jj  
{ 9&.md,U'  
 BOOL bRemoved=FALSE; qQG? k~r  
 for(int index=0;index<MAX_KEY;index++){ ~u2f`67{  
  if(hCallWnd[index]==hWnd){ n*na6rV\k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ g<M!]0OK  
    hCallWnd[index]=NULL; HiU)q  
    HotKey[index]=0; j>:N0:  
    HotKeyMask[index]=0; nGYi mRYO  
    bRemoved=TRUE; TNA7(<"fV|  
    KeyCount--; qm:C1#<p   
    break; lqJ92vi6Q  
   } yt5<J-m  
  } eI2HTFyT  
 } kh2TDxa&  
 return bRemoved; PsXCpyY!s  
} J` GL_@$q  
$,U/,XA {E  
Tq?Ai_  
  DLL中的钩子函数如下: q Tdwi?j_  
{ AYW C6Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NFx%e  
{ -)')PV_+  
 BOOL bProcessed=FALSE; V@-Q&K#  
 if(HC_ACTION==nCode) Hv^Bw{"/R  
 { 6vE#$(n#a&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 DwGM+)!  
   switch(wParam) ./Ek+p*96H  
   {  6o3#<ap<  
    case VK_MENU: RO/(Ldh  
     MaskBits&=~ALTBIT; B>!mD{N  
     break; bEQ-? X%7  
    case VK_CONTROL: c!7WRHJE_a  
     MaskBits&=~CTRLBIT; 0+@:f^3]!  
     break; ZCc23UwI  
    case VK_SHIFT: 6?KUS}nRS  
     MaskBits&=~SHIFTBIT; zb!1o0, J  
     break; .IdbaH _a  
    default: //judge the key and send message 4* >j:1  
     break; K$/"I0YyI  
   } 'b}RFzEn  
   for(int index=0;index<MAX_KEY;index++){ /NCN wAj7  
    if(hCallWnd[index]==NULL) GP hhg  
     continue; ]k7%p>c=B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 37a1O>A  
    { z+6PVQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A-=hvJ5T  
     bProcessed=TRUE; GF% /q:9  
    } uK"FopUJ4i  
   } sRT H_]c  
  } `VO;\s$5j  
  else if((lParam&0xc000ffff)==1){ //有键按下 n9={D  
   switch(wParam) tm=,x~  
   { YARL/V  
    case VK_MENU: t^YtP3`?b  
     MaskBits|=ALTBIT; jmaw-Rx  
     break; Jk&!(YK&  
    case VK_CONTROL: z|%Pi J ,  
     MaskBits|=CTRLBIT; n~|?)EL  
     break; HB5-B XBU  
    case VK_SHIFT: 8uLS7\,$z  
     MaskBits|=SHIFTBIT; {fHor  
     break; r2.w4RMFua  
    default: //judge the key and send message klFS3G  
     break; sV{\IgH/x  
   } "D_:`@V(  
   for(int index=0;index<MAX_KEY;index++){ 59l9_yFJ  
    if(hCallWnd[index]==NULL) ^$lZ  
     continue; $u~ui@kB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2!B|w8ar  
    { Q}lCQK/g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P<vU!`x% q  
     bProcessed=TRUE; @- |G_BZ  
    } t7x<=rW7u  
   } a}FyJp  
  } 6#CswSpS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 #vyf*jPr  
   for(int index=0;index<MAX_KEY;index++){ cw 2!V@  
    if(hCallWnd[index]==NULL) 54>0Dv??H  
     continue; O]=jI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %?gG-R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hwXsfh |  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7A(4`D J  
   } T{+a48,;  
  } {*GBUv5  
 } ,Owk;MV@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); OH2IO  
} BX[ IWP\%  
PL$XXj>|:  
  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: 8HBwcXYoHh  
I P#vfM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {q8|/{;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :+jg311}  
`&q+ f+z  
  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: N^[ F+y  
> VIFQ\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2ak]&ll+h  
{ k $^/$N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 95@u|#n  
 { q5e(~@(z<`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %+j/nA1%S  
  SaveBmp(); N)Q_z9b=  
  return FALSE; U3:|!CC)T  
 } F=e;[uK\  
 …… //其它处理及默认处理 m-Jy 4f#  
} +yfUB8Xw  
UG`~RO  
qF bj~ec  
  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。 :3Q:pKg  
>KrI}>!9r  
  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。 IW<rmP=R&  
&M?b 08  
  二、编程步骤 EEZ~Bs}d  
,S`n?.&& 7  
  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"; t`Z3*?UqI  
?B ,<gen  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; v0)Y,hW  
QlMLWi  
  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; iU 6,B  
&&C70+_po  
  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; G^dp9A  
Ij4q &i"  
  5、 添加代码,编译运行程序。 Posz|u<x  
>>KI_$V  
三、程序代码 )GG9[%H!  
xgIb6<qwY  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL aIa<,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) '1 2*'Q+{+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ RDDA^U7y#  
#if _MSC_VER > 1000 $)ka1L"N  
#pragma once d38o*+JCf  
#endif // _MSC_VER > 1000 AH'c:w]~  
#ifndef __AFXWIN_H__ !zOj`lx  
#error include 'stdafx.h' before including this file for PCH )HE{`yiLL  
#endif &K'*67h  
#include "resource.h" // main symbols lJFy(^KQG,  
class CHookApp : public CWinApp w>X@ ,  
{ i,;eW&  
 public: z-gMk@l  
  CHookApp(); d6tv4Cf  
  // Overrides )Hin{~h  
  // ClassWizard generated virtual function overrides rMIX{K)'f  
  //{{AFX_VIRTUAL(CHookApp) [UzacXt  
 public: Jb*QlsGd  
  virtual BOOL InitInstance(); %p)&mYK{  
  virtual int ExitInstance(); -( p%+`  
  //}}AFX_VIRTUAL HJg&fkHn1  
  //{{AFX_MSG(CHookApp) |^5"-3Q  
  // NOTE - the ClassWizard will add and remove member functions here. F5x*#/af  
  // DO NOT EDIT what you see in these blocks of generated code ! (kY  0<  
  //}}AFX_MSG S"G(_%  
  DECLARE_MESSAGE_MAP() P A ZjA0d  
}; g4,ldr"D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8=Oym~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "!vY{9,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n!Y_SPg   
BOOL InitHotkey(); v+{{j|x=  
BOOL UnInit(); g!_#$az3  
#endif cFq<x=S  
-DHzBq=H  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3\P*"65  
#include "stdafx.h" Gf#l ^yr   
#include "hook.h" diu"Nt  
#include <windowsx.h> pEcYfj3M  
#ifdef _DEBUG 2C:u)}R7D  
#define new DEBUG_NEW r{r~!=u  
#undef THIS_FILE xP>cQELot  
static char THIS_FILE[] = __FILE__; GNM>hQ)h:  
#endif zT)cg$8%fY  
#define MAX_KEY 100 .>TG{>sH  
#define CTRLBIT 0x04 T8g\_m  
#define ALTBIT 0x02 Ot47.z  
#define SHIFTBIT 0x01 #lqH/>`>  
#pragma data_seg("shareddata") IYq#|^)5+  
HHOOK hHook =NULL; =C,DR4xh  
UINT nHookCount =0; 0^V<,CAV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey U { 0~&  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT a"YVr'|  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9jf9 u0  
static int KeyCount =0; P,m+^,  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5L2j, ]  
#pragma data_seg() o>(<:^x9  
HINSTANCE hins; .^=I&X/P  
void VerifyWindow(); K:< Viz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =TEe:%mN  
//{{AFX_MSG_MAP(CHookApp) :35h0;8+  
// NOTE - the ClassWizard will add and remove mapping macros here. @a]cI  
// DO NOT EDIT what you see in these blocks of generated code! IxUj(l1Fm  
//}}AFX_MSG_MAP 9Cd/SlNV2  
END_MESSAGE_MAP() :^`j:B  
n6Uh%rO7S|  
CHookApp::CHookApp() c3l(,5DtH  
{ fgL"\d}  
 // TODO: add construction code here, ,sc#l<v  
 // Place all significant initialization in InitInstance xV+\R/)x  
} ?K pDEH~\  
46)[F0,$r  
CHookApp theApp; C TG^lms  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V2?{ebx`  
{ V*s\~h)  
 BOOL bProcessed=FALSE; nHbi{,3  
 if(HC_ACTION==nCode) 6P >Y2xV:  
 { (Q||5  
  if((lParam&0xc0000000)==0xc0000000){// Key up d!T,fz/-.  
   switch(wParam) %K3U`6kHcd  
   { XQ[\K6X5  
    case VK_MENU: ] H;E(1iU  
     MaskBits&=~ALTBIT; J&'*N :d  
     break; d_$0  
    case VK_CONTROL: 7Z:HwZ  
     MaskBits&=~CTRLBIT; ~b#<HG\,,  
     break; t*Ro2QZ  
    case VK_SHIFT: 1WqCezI  
     MaskBits&=~SHIFTBIT; -a_qZ7  
     break; }*9F`=%F  
    default: //judge the key and send message ]7k:3"wH  
     break; ~u1~%  
   } t1iz5%`p}  
   for(int index=0;index<MAX_KEY;index++){ |7,$.MK-@  
    if(hCallWnd[index]==NULL) uZ_?x~V/  
     continue; <HJLs+C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ']2d^'TH  
    { ) C~#W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z)xcxSo  
     bProcessed=TRUE; : ^}!"4{  
    } Y{e,I-"{  
   } & ;5f/  
  } :I";&7C  
  else if((lParam&0xc000ffff)==1){ //Key down mp sX4  
   switch(wParam) 2l V`UIa  
   { ,V]FAIJ  
    case VK_MENU: r*mYtS  
     MaskBits|=ALTBIT; 2Q(ZW@0  
     break; :n~Mg{j3  
    case VK_CONTROL: l<=k#d  
     MaskBits|=CTRLBIT; N4VZl[7?  
     break; X(d:!-_m *  
    case VK_SHIFT: emJZ+:%  
     MaskBits|=SHIFTBIT; "dndhoMq  
     break; !X"nN9k  
    default: //judge the key and send message aDz% %%:r  
     break; ]5*H/8Ke7  
   } -ys/I,}<  
   for(int index=0;index<MAX_KEY;index++) #gWok'ZcR  
   { R$}Hv  
    if(hCallWnd[index]==NULL) D8w.r"ne  
     continue; ?\4kV*/Cqz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $Nvox<d0  
    { RjP]8tH&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z<A8S=s6n  
     bProcessed=TRUE; D.7cWR`Wp  
    } EqD@o  
   } h8.(Q`tli  
  } 8TH;6-RT  
  if(!bProcessed){ dQH8s  
   for(int index=0;index<MAX_KEY;index++){ {s*1QBM$\Z  
    if(hCallWnd[index]==NULL) ~a7@O^q 4  
     continue; \hlS?uD\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jZ5ac=D&I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0#yH<h$   
   } SI6?b1;-:F  
  } `{w|2 [C3  
 } \[]BB5)8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jsV1~1:83  
} K-*ZS8  
(mi=I3A(  
BOOL InitHotkey() lv.h?"Ml  
{ p|0SA=?k"  
 if(hHook!=NULL){ %ByqkY{5F  
  nHookCount++; DD7D&@As  
  return TRUE; AxJqLSfyb,  
 } HWou&<EK  
 else s;Zi   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  56C'<#  
  if(hHook!=NULL) Gyi0SM6v5&  
   nHookCount++; &kWT<*;J)  
  return (hHook!=NULL); M9VAs~&S  
} FDBNKQV  
BOOL UnInit() .gRb'  
{ 9XS>;<"2  
 if(nHookCount>1){ z:O:g?A  
  nHookCount--; b4KNIP7E  
  return TRUE; 0lqh;/  
 } /NPx9cLW^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ZW;Re5?DJ  
 if(unhooked==TRUE){ 7S= ]@*  
  nHookCount=0; [ryII hQ  
  hHook=NULL; Q}lY1LT`  
 } %AT/g&M&1#  
 return unhooked; ,HE{&p2y  
} DeN2P  
~:C`e4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Frx_aGLH1  
{ :%fnJg(  
 BOOL bAdded=FALSE; /^~)iTwH  
 for(int index=0;index<MAX_KEY;index++){ y(C',Xn  
  if(hCallWnd[index]==0){ 44^jE{,9  
   hCallWnd[index]=hWnd; ] :](xW%  
   HotKey[index]=cKey; qw|B-lT{:  
   HotKeyMask[index]=cMask; n%vmo f  
   bAdded=TRUE; "0>AefFd#  
   KeyCount++; 6lr<{k7Nw  
   break; 6: R1jF*eG  
  } r5lPO*?Df  
 } u8x#XESR7  
 return bAdded; l~1l~Gx_&n  
} =jG."o  
)ZZ6 (O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K[V#Pj9  
{ @9]TjZd  
 BOOL bRemoved=FALSE; -Y"2c,~pH  
 for(int index=0;index<MAX_KEY;index++){ *L<<S=g$2  
  if(hCallWnd[index]==hWnd){ FYg{IKg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 77]Fp(uI  
    hCallWnd[index]=NULL; 6%c]{eTd9  
    HotKey[index]=0; a}k5[)et  
    HotKeyMask[index]=0; `- 9p)@'8k  
    bRemoved=TRUE; 3P'Wk|j  
    KeyCount--; zb!RfQ,  
    break; HErG%v]nw  
   } d(D|rf,av  
  } |t58n{V.O  
 } 5S! !@P!,  
 return bRemoved; (x[z=_I%`  
} p@YbIn  
]*rK;  
void VerifyWindow() &x4|!" G  
{ 9PR?'X;4  
 for(int i=0;i<MAX_KEY;i++){ py/#h$eY  
  if(hCallWnd!=NULL){ N71%l  
   if(!IsWindow(hCallWnd)){ k <LFH(  
    hCallWnd=NULL; 7X/B9Hee  
    HotKey=0; x)kp*^/  
    HotKeyMask=0; YO.+ 06X  
    KeyCount--; 99Nm?$ g  
   } *APTgXYR  
  } SQG9m2  
 } qHYoQ.ke  
} 7*Gg#XQ>(  
hus9Zv4  
BOOL CHookApp::InitInstance() Hq <!&  
{ l8DZ2cw]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); R36A_  
 hins=AfxGetInstanceHandle(); }SW>ysw'm  
 InitHotkey(); [-=y*lx %g  
 return CWinApp::InitInstance(); Jj+Hj[(@  
} u>03l(X6f  
=kW7|c5Z  
int CHookApp::ExitInstance() #/>OW2Ny  
{ 2J6(TrQ  
 VerifyWindow(); s%l^zA(  
 UnInit(); 6l(HD([_p  
 return CWinApp::ExitInstance(); 0ol*!@?  
} _/}/1/y$Y  
io$fL_R=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $viZ[Lu!m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) yzL6oU-{&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u5P2*  
#if _MSC_VER > 1000 f5t/=/6>F  
#pragma once j@jUuYuDgl  
#endif // _MSC_VER > 1000 0 SDyE  
@ql S #(  
class CCaptureDlg : public CDialog T^nOv2@,  
{ Up1e4mNL  
 // Construction /V>yF&p  
 public: 6PRP&|.#  
  BOOL bTray; AUm5$;o,/  
  BOOL bRegistered; y?xFF9W@H  
  BOOL RegisterHotkey(); |#O>DdKHT  
  UCHAR cKey; ALp|fZ\vp  
  UCHAR cMask; )#025>$z  
  void DeleteIcon(); U{&gV~  
  void AddIcon(); 3c[TPD_:  
  UINT nCount; 3ZL<6`YF  
  void SaveBmp(); 8]% e[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ob h@d|  
  // Dialog Data /V E|FTs  
  //{{AFX_DATA(CCaptureDlg) 89%#;C  
  enum { IDD = IDD_CAPTURE_DIALOG }; p y%RR*4#  
  CComboBox m_Key; &jE@i#  
  BOOL m_bControl; y-a3  
  BOOL m_bAlt; Zopi;O J  
  BOOL m_bShift; #J*hZ(Pq  
  CString m_Path; p) m0\  
  CString m_Number; Uizg.<.  
  //}}AFX_DATA j:'8yFi_  
  // ClassWizard generated virtual function overrides 43BqNQ0  
  //{{AFX_VIRTUAL(CCaptureDlg) t$ 3/ZTx  
 public: GNI:k{H@"?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ou2p^:C(  
 protected: 6fw2 ;$x"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F+m;y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CdNb&Nyz  
  //}}AFX_VIRTUAL )8JM.:,  
  // Implementation oYrg;]H  
 protected: %bgUU|CdA  
  HICON m_hIcon; ECvTmU'=  
  // Generated message map functions 8@d@T V!n&  
  //{{AFX_MSG(CCaptureDlg) tE;c>=>t  
  virtual BOOL OnInitDialog(); ?!$:I8T  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1HBXD\!  
  afx_msg void OnPaint(); G9r~O#=gy  
  afx_msg HCURSOR OnQueryDragIcon(); 4)E$. F^   
  virtual void OnCancel(); %HcCe[d5l  
  afx_msg void OnAbout(); 'Em633  
  afx_msg void OnBrowse(); CjUYwAy$k  
  afx_msg void OnChange(); o6)U\z  
 //}}AFX_MSG >AUzsQ  
 DECLARE_MESSAGE_MAP() =nE^zY2m%  
}; BKd?%V8:Q  
#endif `]wk)50BVp  
T3h1eU  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^.@F1k  
#include "stdafx.h" M.fA5rJ^  
#include "Capture.h" z?'z{+HY  
#include "CaptureDlg.h" Q4F&#^02y  
#include <windowsx.h> ..UA*#%1  
#pragma comment(lib,"hook.lib") oR'u&\mB  
#ifdef _DEBUG C,VvbB  
#define new DEBUG_NEW P$*9Z@  
#undef THIS_FILE :HkX sZ  
static char THIS_FILE[] = __FILE__; -qdt$jIM  
#endif cng166}1A  
#define IDM_SHELL WM_USER+1 Nyl)B7/w  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cSYMnB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :*WiswMFm  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G]O5irsV  
class CAboutDlg : public CDialog V$3`y=8  
{ [Lq9lw&   
 public: ;={3H_{3  
  CAboutDlg(); ].Xh=7&2{  
  // Dialog Data 1EA#c>I$  
  //{{AFX_DATA(CAboutDlg) !AN;  
  enum { IDD = IDD_ABOUTBOX }; #N;McF;W  
  //}}AFX_DATA R0YWe  
  // ClassWizard generated virtual function overrides K#xL-   
  //{{AFX_VIRTUAL(CAboutDlg) /-Z}=  
 protected: e$o]f"(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `j!XWh*$  
  //}}AFX_VIRTUAL CO`?M,x>  
  // Implementation [Z;ei1l  
 protected: @z>DJ>htN  
  //{{AFX_MSG(CAboutDlg) #O^%u,mJj  
  //}}AFX_MSG t:*1* ;  
  DECLARE_MESSAGE_MAP() -mLS\TFS  
}; #M@~8dAH}M  
5Kw?#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) i7%`}t  
{ B0D  
 //{{AFX_DATA_INIT(CAboutDlg) %BF,;(P  
 //}}AFX_DATA_INIT qIvnPaYW  
} [G' +s  
j%=X ps  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $+$4W\-=X  
{ vL8Rg} Jh4  
 CDialog::DoDataExchange(pDX); iAZbh"I  
 //{{AFX_DATA_MAP(CAboutDlg) sq?js#C5  
 //}}AFX_DATA_MAP S ^$!n,  
} %a']TX  
yf/i)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) U< <XeSp  
 //{{AFX_MSG_MAP(CAboutDlg) D.gD4g_O/  
 // No message handlers {%c&T S@s  
 //}}AFX_MSG_MAP -quJX;~  
END_MESSAGE_MAP() 2@Oz_?O=  
J;'H],w}f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5}Z>N,4  
: CDialog(CCaptureDlg::IDD, pParent) Z{x)v5yh2V  
{ U7HfDDh  
 //{{AFX_DATA_INIT(CCaptureDlg) +QP(ATdM  
  m_bControl = FALSE; oSIP{lfp2Q  
  m_bAlt = FALSE; EVP{7}K1  
  m_bShift = FALSE; "r1 !hfIYf  
  m_Path = _T("c:\\"); 2}15FXgN  
  m_Number = _T("0 picture captured."); '3?-o|v@D  
  nCount=0; nf1O8FwRb  
  bRegistered=FALSE; WjOP2CVv|  
  bTray=FALSE; $$i Gs6az  
 //}}AFX_DATA_INIT #n]K$k>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oxL)Jx\c9A  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [}yPy))A  
} }46Zfg\T6n  
oX7_v_:J\R  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nDyA][  
{ 6j95>}@  
 CDialog::DoDataExchange(pDX); '}IGV`c  
 //{{AFX_DATA_MAP(CCaptureDlg) 6-FM<@H{  
  DDX_Control(pDX, IDC_KEY, m_Key); RK=Pm7L:`y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Iw?*y.z|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q]e]\J  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); @km4qJZ  
  DDX_Text(pDX, IDC_PATH, m_Path); e$/y ~!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); kU,g=+ 2J  
 //}}AFX_DATA_MAP >>|47ps3  
} kW0ctGFYlf  
YQb503W"d~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r dCs  
//{{AFX_MSG_MAP(CCaptureDlg) >Y(JC#M;  
 ON_WM_SYSCOMMAND() 6|IJwP^Q_  
 ON_WM_PAINT() EP^qj j@M  
 ON_WM_QUERYDRAGICON() -[}Aka,f!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) d0R;|p''Z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (,KzyR=*'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) e?FQ6?  
//}}AFX_MSG_MAP oW^>J-  
END_MESSAGE_MAP() X *EseC  
*,t/IA|  
BOOL CCaptureDlg::OnInitDialog() AN3oh1xe:  
{ [5ncBY*A7  
 CDialog::OnInitDialog(); Kj)sL0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 41P0)o  
 ASSERT(IDM_ABOUTBOX < 0xF000); TU': Rt  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {{?MO{Mh*  
 if (pSysMenu != NULL) |=07n K2  
 { bR,Es~n  
  CString strAboutMenu; \iaZV.#f  
  strAboutMenu.LoadString(IDS_ABOUTBOX); (<rE1w2s:  
  if (!strAboutMenu.IsEmpty()) <v/aquLN  
  { :,fT^izew  
   pSysMenu->AppendMenu(MF_SEPARATOR); Zu2`IzrG#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); JY@bD:  
  } vG7Mk8mIr  
 } 1rs.  
 SetIcon(m_hIcon, TRUE); // Set big icon :!hO9ho  
 SetIcon(m_hIcon, FALSE); // Set small icon <B>hvuCoH  
 m_Key.SetCurSel(0); p3Ozfk  
 RegisterHotkey(); -<9Qez)y  
 CMenu* pMenu=GetSystemMenu(FALSE); {~w(pAx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $2+s3)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fDqDU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); HEAW](s  
 return TRUE; // return TRUE unless you set the focus to a control % 8wBZ~1-  
} $-u c#57  
%|ClYr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 'HJ+)[0X*  
{ v 2 p  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) p(nO~I2E  
 { TspX7<6r  
  CAboutDlg dlgAbout;  Na@;F{  
  dlgAbout.DoModal(); \o=9WKc  
 } *JfGGI_E  
 else L>mM6$l  
 { v9FR  
  CDialog::OnSysCommand(nID, lParam); _>n)HG  
 } 'n>44_7L  
} O2?yI8|Jn  
FPkk\[EU  
void CCaptureDlg::OnPaint() S=lCzL;j"  
{ wVFa51a)yy  
 if (IsIconic()) ZZZ`@pXm;  
 { ~5h4 Gy)  
  CPaintDC dc(this); // device context for painting M$.bC0}T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q'a]DJ`  
  // Center icon in client rectangle ju3@F8AI  
  int cxIcon = GetSystemMetrics(SM_CXICON); :*BN>*1^\r  
  int cyIcon = GetSystemMetrics(SM_CYICON); Ph%ylS/T{  
  CRect rect; VcXr!4 M  
  GetClientRect(&rect); ^*4#ZvpG2  
  int x = (rect.Width() - cxIcon + 1) / 2; j`q>YPp  
  int y = (rect.Height() - cyIcon + 1) / 2; mdyl;e{0  
  // Draw the icon n1 GX` K  
  dc.DrawIcon(x, y, m_hIcon); Dt>tTU 6  
 }  :\'1x  
 else 5z9hcQAS  
 { p`rjWpH  
  CDialog::OnPaint(); U, 7  
 } jnbR}a=fJ  
} &bfM`h'  
qo 7<g*kf~  
HCURSOR CCaptureDlg::OnQueryDragIcon() Mpyza%zj  
{ !/tV}.*  
 return (HCURSOR) m_hIcon; g!' x5#]n  
} y9]7LETv\M  
8{!|` b'f  
void CCaptureDlg::OnCancel() H^5,];  
{ lP)n$?u  
 if(bTray) 5+!yXkE^e  
  DeleteIcon(); Pv,PS.,-  
  CDialog::OnCancel(); j>?nL~{  
} :RukW.MR  
lK7:qo  
void CCaptureDlg::OnAbout() }~=<7|N.  
{ @%2crJnkS  
 CAboutDlg dlg; )m3emMO2  
 dlg.DoModal(); #<B?+gzFM{  
} <*z'sUh+}  
A^6z.MdYZ  
void CCaptureDlg::OnBrowse() wBg?-ji3<  
{ {d'B._#i  
 CString str; ?lgE9I]  
 BROWSEINFO bi; r>|S4O  
 char name[MAX_PATH]; X_nbNql  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); H7P}=YW".  
 bi.hwndOwner=GetSafeHwnd(); )quQI)Ym  
 bi.pszDisplayName=name; HJJ)DE7;  
 bi.lpszTitle="Select folder"; G~.VW48{n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x=a#|]ngG  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); y7CXE6Y  
 if(idl==NULL) 9z{}DBA  
  return; M,p0wsj;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #y7MB6-  
 str.ReleaseBuffer(); rA8NE>  
 m_Path=str; -c1-vGW/  
 if(str.GetAt(str.GetLength()-1)!='\\') qGR1$\]  
  m_Path+="\\"; m*HUT V  
 UpdateData(FALSE); @ N'P?i  
} a6ryyt 5  
T,a{mi.hNR  
void CCaptureDlg::SaveBmp() 0S;Ipg  
{ t4d/%b~{:U  
 CDC dc; YGM7?o  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p=eSJ*  
 CBitmap bm; roAHkI  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2B6u) 95  
 int Height=GetSystemMetrics(SM_CYSCREEN); *^7^g!=z2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |}e"6e%  
 CDC tdc; uEr.LCAS  
 tdc.CreateCompatibleDC(&dc); R\n@q_!`X  
 CBitmap*pOld=tdc.SelectObject(&bm);  PBW_9&d  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6tP!(  
 tdc.SelectObject(pOld); n} !')r  
 BITMAP btm; /Us+>vg!  
 bm.GetBitmap(&btm);  -L2 +4  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (QqeMG,Y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^/Yk*Ny  
 BITMAPINFOHEADER bih; -{JReplc  
 bih.biBitCount=btm.bmBitsPixel; y c<%f  
 bih.biClrImportant=0; ^-s7>F`jx  
 bih.biClrUsed=0; sA: /!9  
 bih.biCompression=0; ~Ni-}p  
 bih.biHeight=btm.bmHeight; J32{#\By  
 bih.biPlanes=1; S\sy^Kt~4:  
 bih.biSize=sizeof(BITMAPINFOHEADER); @q]!C5  
 bih.biSizeImage=size; #z.\pd  
 bih.biWidth=btm.bmWidth; rk ,64(  
 bih.biXPelsPerMeter=0; 1 rbc}e  
 bih.biYPelsPerMeter=0; 1yU!rEH  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); RiZ}cd  
 static int filecount=0; "FGgem%9  
 CString name; wT;;B=u}G  
 name.Format("pict%04d.bmp",filecount++); =8p[ (<F=  
 name=m_Path+name; i ^N}avO  
 BITMAPFILEHEADER bfh; B}p.fE  
 bfh.bfReserved1=bfh.bfReserved2=0; $1)NYsSH/H  
 bfh.bfType=((WORD)('M'<< 8)|'B'); "4smW>f:%  
 bfh.bfSize=54+size; PiR`4Tu  
 bfh.bfOffBits=54; MfLus40;n  
 CFile bf; p"cY/2w:j  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ WYCDEoqU2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _ J"J[$  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cY~lDLyB  
  bf.WriteHuge(lpData,size); j.c4  
  bf.Close(); Cd p_niF  
  nCount++; !g>mjD  
 } 5=8_Le  
 GlobalFreePtr(lpData); hiR+cPSF  
 if(nCount==1) l>HB0o  
  m_Number.Format("%d picture captured.",nCount); X/Fip 0i  
 else ={190=\9  
  m_Number.Format("%d pictures captured.",nCount); ;lTgihW-  
  UpdateData(FALSE); <_bGV  
} =*y{y)B^g  
!a5e{QG0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }_Sgor83n  
{ i~HS"n  
 if(pMsg -> message == WM_KEYDOWN) mUb2U&6(  
 { [vdC$9z,  
  if(pMsg -> wParam == VK_ESCAPE) =E~SaT  
   return TRUE; <sGioMr  
  if(pMsg -> wParam == VK_RETURN) >6;RTN/P2  
   return TRUE; cetlr  
 } JvW!w)$pY  
 return CDialog::PreTranslateMessage(pMsg); ,Qe`(vU*s  
}  :KRe==/  
63i&e/pv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9B3}LVg\  
{ *(*XNd||  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5M3)7  
  SaveBmp(); oX/#Mct{s  
  return FALSE; .M\0+,%/  
} DB] ]6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VD=F{|^  
 CMenu pop; zjx'nK{eI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3_ =:^Z  
 CMenu*pMenu=pop.GetSubMenu(0); y=}a55:qE  
 pMenu->SetDefaultItem(ID_EXITICON); 90$`AMR  
 CPoint pt; Rmh,P>  
 GetCursorPos(&pt); !{oP'8Ax$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ou&7v<)x4  
 if(id==ID_EXITICON) n 8e}8.Bu  
  DeleteIcon(); YH!` uU(Lh  
 else if(id==ID_EXIT) C1~Ro9si  
  OnCancel(); jZ69sDhE  
 return FALSE; /lvH p  
} =G<S!qW  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W&a<Q)o*I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |fm"{$u  
 AddIcon(); AyZBH &}RZ  
 return res; 4T#Z[B[  
} }EHmVPe  
uwb>q"M  
void CCaptureDlg::AddIcon() wsfn>w?!V  
{ 7Y'.yn  
 NOTIFYICONDATA data; Ucok&)7-  
 data.cbSize=sizeof(NOTIFYICONDATA); $;+`sVG  
 CString tip; })r[q sv  
 tip.LoadString(IDS_ICONTIP); ^ )/oDyO  
 data.hIcon=GetIcon(0); uH!;4@ uI  
 data.hWnd=GetSafeHwnd(); C{):jH,Rf  
 strcpy(data.szTip,tip); .:s**UiDR  
 data.uCallbackMessage=IDM_SHELL; w-MnJ(r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rru `% ~'O  
 data.uID=98; c=HL 6v<  
 Shell_NotifyIcon(NIM_ADD,&data); =Wk!mGc  
 ShowWindow(SW_HIDE); e c`3Qw  
 bTray=TRUE; qu/59D  
} /ZKO\q  
T|[ o  
void CCaptureDlg::DeleteIcon() e[8p/hId  
{ /CN^">|_  
 NOTIFYICONDATA data; G%K<YyAP  
 data.cbSize=sizeof(NOTIFYICONDATA); } Pc6_#  
 data.hWnd=GetSafeHwnd(); &wZ:$lK#o  
 data.uID=98; XA:v:JFS  
 Shell_NotifyIcon(NIM_DELETE,&data);  G l*C"V  
 ShowWindow(SW_SHOW); "I]% aK0  
 SetForegroundWindow(); yeNC-U<  
 ShowWindow(SW_SHOWNORMAL); Si]8*>}-B  
 bTray=FALSE; Fu(I<o+T-  
} asI:J/%+2  
4o2 C=?@(  
void CCaptureDlg::OnChange() &sQtS  
{ `W[oLQ  
 RegisterHotkey(); ]7^YPFc+  
} ef!V EtEOv  
BY$%gIB6>  
BOOL CCaptureDlg::RegisterHotkey() PTvP;  
{ 8P'>%G<m  
 UpdateData(); CtA0W\9w5a  
 UCHAR mask=0; rf8`|9h"7  
 UCHAR key=0; "sRR:wzQu  
 if(m_bControl) .yF7{/  
  mask|=4; #.%;U' #O  
 if(m_bAlt) i5*sG^<$H  
  mask|=2; @hWt.qO3s  
 if(m_bShift) {j E}mzi  
  mask|=1; B;':Eaa@  
  key=Key_Table[m_Key.GetCurSel()]; ^YKEc0"w(  
 if(bRegistered){ }45&s9m=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]ba O{pJi  
  bRegistered=FALSE; u<\/T&S  
 } #x&1kHu<  
 cMask=mask; F 3}cVO2bY  
 cKey=key; P{)eZINlE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pUr.<yc&u  
 return bRegistered; TP oP%Yj"  
} 70m}+R(`  
y_8 8I:O  
  四、小结 -q\1Tlc]3  
BaTE59W  
  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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