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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: $8i t&/JP,  
  yMz@-B  
  一、实现方法 H`@x5RjS   
J)g(Nw,O  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: pm)A*][s  
TR)' I  
#pragma data_seg("shareddata") &]z2=\^e  
HHOOK hHook =NULL; //钩子句柄 wRie{Vk  
UINT nHookCount =0; //挂接的程序数目 Zqam Iq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 .WG@"2z|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?+Qbr$]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0W=IuPDU  
static int KeyCount =0; xOu cZ+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 * 5P/&*c|  
#pragma data_seg() e[e2X<&0RT  
'm/b+9?.  
  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。 .2Rh_ful  
1uy+'2[Z-D  
  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: NU 6P  
@69q// #B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR QCtG #/  
cKey,UCHAR cMask) Bq@G@Qi  
{ z1]RwbA?1  
 BOOL bAdded=FALSE; }:hdAZ+z  
 for(int index=0;index<MAX_KEY;index++){ F` ?pZ  
  if(hCallWnd[index]==0){ N$=<6eQm  
   hCallWnd[index]=hWnd; Z)?"pBv'  
   HotKey[index]=cKey; Pel3e ~?t  
   HotKeyMask[index]=cMask; #4" \\  
   bAdded=TRUE; \j K?R 6  
   KeyCount++; $!fz87-p>  
   break; x3M`l|  
  } a{u)~:/G  
 } E26ZVFg  
 return bAdded; p$"*U[%l  
} lv8tS-  
//删除热键 wPG3Ap8L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dB1bf2'b#  
{ Ajq<=y`NzV  
 BOOL bRemoved=FALSE; (oTx*GP>Y  
 for(int index=0;index<MAX_KEY;index++){ ]7br*t^zv  
  if(hCallWnd[index]==hWnd){ #~ >0Dr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?.~@lE  
    hCallWnd[index]=NULL; 3[Z?`X  
    HotKey[index]=0; fCF93,?$  
    HotKeyMask[index]=0; b8`O7@ar  
    bRemoved=TRUE; %F{@DN`  
    KeyCount--; f:BW{Cij;y  
    break; 2#py>rF(  
   } vwT?Bp  
  } rN>f"/J |  
 } CP={|]>+S  
 return bRemoved; n7Re@'N<  
} &Wn!W  
4ci @$nL1  
;,IGO7R  
  DLL中的钩子函数如下: o!j? )0d  
Z?^AX&F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b2:CFtH5  
{ 7, O_'T &  
 BOOL bProcessed=FALSE; ^LnCxA&QH  
 if(HC_ACTION==nCode)  /h   
 { #%E~I A%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vmk c]DC  
   switch(wParam) ^srx/6X  
   {  i*F^;-q)  
    case VK_MENU: 3tgct <"  
     MaskBits&=~ALTBIT; Qy9#(596  
     break; G:A` n;E0  
    case VK_CONTROL: O*c +TiTb  
     MaskBits&=~CTRLBIT; G `TO[p]q  
     break; L]9*^al  
    case VK_SHIFT: ! WQEv_G@  
     MaskBits&=~SHIFTBIT; /oh[ Nu1D  
     break; hL&z"_`  
    default: //judge the key and send message M(5lSu  
     break; =o9 %)  
   } jgukW7H  
   for(int index=0;index<MAX_KEY;index++){ 1k;X*r#  
    if(hCallWnd[index]==NULL) J/)Q{*`_  
     continue; %"{SGp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h( Iti&  
    { _%.atW7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Knn$<!>  
     bProcessed=TRUE; M<Eg<*  
    } cp]\<p('A  
   } edbzg #wy  
  } iao_w'tJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 0 5 `x$f  
   switch(wParam) ?L7z\b"_~  
   { B(E+2;!QF  
    case VK_MENU: DQwbr\xy\  
     MaskBits|=ALTBIT; Xo$(zGb  
     break; ^F_c'  
    case VK_CONTROL: 6$`8y,TMSt  
     MaskBits|=CTRLBIT; ^Z;5e@S  
     break; -k!UcMWP  
    case VK_SHIFT: 0urQA_JC  
     MaskBits|=SHIFTBIT; fF<~2MiKw  
     break; 4R}2H>VV%  
    default: //judge the key and send message z${DW@o3  
     break; $1/yc#w u  
   } |"\A5v|1  
   for(int index=0;index<MAX_KEY;index++){ 4fp}`U  
    if(hCallWnd[index]==NULL) 7!z0)Ai_>=  
     continue; !~PV\DQN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vr2tMD  
    { j#.Aiy:,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2gukK8R$  
     bProcessed=TRUE; >~2oQ[ n  
    } i. 6c;KU  
   } Wc#4%kT  
  } U%m,:b6V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0<nk>o  
   for(int index=0;index<MAX_KEY;index++){  iCa#OQ  
    if(hCallWnd[index]==NULL) jIg]?4bW[  
     continue; @ 2Z{en?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T[q2quXgk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qN[U|3k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 08cC rG  
   } ~xkcQ{  
  } -=@d2LY  
 } wNq#vn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g2BE-0,R  
} RQ!kVM@  
9K~X}]u  
  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: PA&Ev0`+  
1H{J T op  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Jf9a<[CcV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ={B%qq  
<V>]-bl/  
  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: 4Zo.c* BZ  
Wv8?G~>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y'mtMLfMc  
{ =g UOHH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) RGf&KV/  
 { Z<@0~t_:?p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J>TNyVaoQ  
  SaveBmp(); #;z;8q  
  return FALSE; ACctyGd  
 } O,x[6P54P  
 …… //其它处理及默认处理 e?,n>  
} xG/B$DLn  
`zw XfY,%  
r roI  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 e ^2n58  
[+ K jun_  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 _ VKBzOH  
C6Lc   
  二、编程步骤 "m4. _4U  
<Z5-?wgf9  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; j4k\5~yzS  
41Hv)}Yd  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; e#!%:M;4P  
3K!(/,`  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ^CO{86V  
c#( Hh{0  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; -n FKP&P  
9kHVWDf  
  5、 添加代码,编译运行程序。 k<Qhw)M8  
{bHUZen  
三、程序代码 !K*(# [  
ti'B}bH>'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Bs)'Gk`1  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0Un?[O  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 0$ JH5RC  
#if _MSC_VER > 1000 3>M%?d  
#pragma once B\S}*IE  
#endif // _MSC_VER > 1000 lonV_Xx  
#ifndef __AFXWIN_H__  |W_;L6)  
#error include 'stdafx.h' before including this file for PCH ORuC("  
#endif 2[j(C  
#include "resource.h" // main symbols UE8j8U'L  
class CHookApp : public CWinApp @GUlw[vi  
{ ZP{<f~;  
 public: 4Hy/K^Ci  
  CHookApp(); 7zM9K+3L  
  // Overrides HxSq &j*F  
  // ClassWizard generated virtual function overrides ~jC+6v  
  //{{AFX_VIRTUAL(CHookApp) xP4}LL9)  
 public: e[ yN  
  virtual BOOL InitInstance(); 1r$*8 |p  
  virtual int ExitInstance(); ja^_Lh9  
  //}}AFX_VIRTUAL .DNPL5[v  
  //{{AFX_MSG(CHookApp) !]5}N^X  
  // NOTE - the ClassWizard will add and remove member functions here. !7Eodq-0  
  // DO NOT EDIT what you see in these blocks of generated code ! ;/:Sx/#s  
  //}}AFX_MSG 5`Q j<   
  DECLARE_MESSAGE_MAP() t:MSV?  
}; wXjidOd $  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \?SvO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); e,N}z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); is }>+&_  
BOOL InitHotkey(); ]Hp>~Zvbb  
BOOL UnInit(); IjGPiC  
#endif pHT]2e#  
sYjhQN=Y*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3xT9/8*  
#include "stdafx.h" .G.WPVE  
#include "hook.h" '2GnAws^  
#include <windowsx.h> ^/_Yk.w  
#ifdef _DEBUG /~M H]Gh  
#define new DEBUG_NEW o^XDG^35`  
#undef THIS_FILE &rGB58  
static char THIS_FILE[] = __FILE__; KL9k9|!p  
#endif fIl;qGz85  
#define MAX_KEY 100 WQ{[q" O  
#define CTRLBIT 0x04 w A\5-C7 j  
#define ALTBIT 0x02 z/u^  
#define SHIFTBIT 0x01 8N%nG( 0  
#pragma data_seg("shareddata") W1 k]P.  
HHOOK hHook =NULL; )adV`V%=>  
UINT nHookCount =0; q`,%L1c4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey [Ur\^wS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y{D%v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~w a6S?  
static int KeyCount =0; Z:dp/M}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P#O2MiG  
#pragma data_seg() S=(<m%f  
HINSTANCE hins; gVrQAcJj  
void VerifyWindow(); 2]1u0-M5L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U.KQjBi  
//{{AFX_MSG_MAP(CHookApp) rUpe  ;c  
// NOTE - the ClassWizard will add and remove mapping macros here. baBBn %_V  
// DO NOT EDIT what you see in these blocks of generated code! >!6|yk`GJ  
//}}AFX_MSG_MAP U@M3.[jw  
END_MESSAGE_MAP() Hs*["zFc  
T]\c2U  
CHookApp::CHookApp() ;I&VpAPx  
{ I]^>>>p$  
 // TODO: add construction code here, L8 L1_  
 // Place all significant initialization in InitInstance wqhktgG  
} <q8@a0e@  
q pCI [[  
CHookApp theApp; _]-4d_&3(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C,An\lsT  
{ W7^[W.  
 BOOL bProcessed=FALSE; Xx"<^FS[zC  
 if(HC_ACTION==nCode) G@.MP| 2  
 { x2rAB5r6  
  if((lParam&0xc0000000)==0xc0000000){// Key up #L~i|(=U5  
   switch(wParam) &)Xc'RQ.C  
   { Lm TFvZ  
    case VK_MENU: X/yq<_ g  
     MaskBits&=~ALTBIT; &}r"Z?f)  
     break; lG}#K^q  
    case VK_CONTROL: -}#HaL#'K  
     MaskBits&=~CTRLBIT; Iko]c_W0  
     break; VG);om7`PD  
    case VK_SHIFT: g w" \pD  
     MaskBits&=~SHIFTBIT; N-gYamlQ  
     break; u.|Z3=?VG  
    default: //judge the key and send message F!]Sr'UA  
     break; M2O_kO eZ  
   } q.c)>=!.  
   for(int index=0;index<MAX_KEY;index++){  Y !?'[t  
    if(hCallWnd[index]==NULL) (k?H T'3)  
     continue; G3~`]qf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [ QiG0D_'=  
    { b6bs .  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); yOq@w!xz  
     bProcessed=TRUE; wT4@X[5$  
    } E5w;75,  
   } 9af.t  
  } {'5"i?>s0>  
  else if((lParam&0xc000ffff)==1){ //Key down O`B,mgT(  
   switch(wParam) CIjc5^Y2  
   { `ePC$Ovn  
    case VK_MENU: 0f^{Rp6  
     MaskBits|=ALTBIT; -QrC>3xZR  
     break; V)j[`,M:  
    case VK_CONTROL: ,%M[$S'  
     MaskBits|=CTRLBIT; A*EOn1hN  
     break; Rff F:,b  
    case VK_SHIFT: FTf#"'O  
     MaskBits|=SHIFTBIT; ilA45@  
     break; Xw-[Sf]p  
    default: //judge the key and send message v1 .3gzR  
     break; CkT(\6B-  
   } JE=t e(a  
   for(int index=0;index<MAX_KEY;index++) X\AH^I6S  
   { G0E5Y;YIN$  
    if(hCallWnd[index]==NULL) vADiW~^Q^  
     continue; *MP.YI:h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vw;Z0_C  
    { '<R>cN"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R4m {D  
     bProcessed=TRUE; ={qcDgn~C  
    } |A8@r&   
   } "& ,ov#  
  } O G`8::S  
  if(!bProcessed){ ,/42^|=Z6O  
   for(int index=0;index<MAX_KEY;index++){ /Mqhx_)>A  
    if(hCallWnd[index]==NULL) `(e :H  
     continue; /yOx=V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /wV|;D^ )  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3Q=^&o0fl  
   } Gv:~P_vBH[  
  } t|aV:x  
 } Nep4 J;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &X=7b@r  
} CXa[%{[n  
eb62(:=N6  
BOOL InitHotkey() ?=VvFfv%  
{ (_T{Z>C/J  
 if(hHook!=NULL){ 6 ':iW~iI  
  nHookCount++; o ).deP s-  
  return TRUE; B5b:znW2@  
 } %6UF%dbYH`  
 else h>-P/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h051Ol\v*  
  if(hHook!=NULL) I;(3)^QH#  
   nHookCount++; at: li  
  return (hHook!=NULL); 3S^0%"fY  
} #z\ub5um  
BOOL UnInit() D|]BFu)F  
{ H_+n_r*  
 if(nHookCount>1){ dftBD  
  nHookCount--; s]arNaaA  
  return TRUE; bSB%hFp=Cp  
 } SmRlZ!%e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4,9$udiGY  
 if(unhooked==TRUE){ 6Sr]<I +:  
  nHookCount=0; fab'\|Y   
  hHook=NULL; ,X4e?$7g  
 } d2rs+-  
 return unhooked; d9N[f>  
} ,YYEn^:>  
GG} %  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nhV"V`|d  
{ RBX<>*  
 BOOL bAdded=FALSE; IGlR,tw_/  
 for(int index=0;index<MAX_KEY;index++){ nM,:f)z  
  if(hCallWnd[index]==0){ ']_2@<XW)  
   hCallWnd[index]=hWnd; 5/meH[R\M  
   HotKey[index]=cKey; f6Qr0Op  
   HotKeyMask[index]=cMask; ZN[<=w&(cB  
   bAdded=TRUE; \br!77  
   KeyCount++; Ey6R/M)?:y  
   break; !l:GrT8J  
  } ;nY#/%f  
 } =2Y;)wrF  
 return bAdded;  bGRt  
} qQ@| Cj  
9U8M|W|d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S,Y|;p<+^  
{ c}(WniR-"  
 BOOL bRemoved=FALSE; *@U{[J  
 for(int index=0;index<MAX_KEY;index++){ Dg&84,bv^  
  if(hCallWnd[index]==hWnd){ jL VJ+mu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1W^hPY  
    hCallWnd[index]=NULL; y<)TYr  
    HotKey[index]=0; j8Z,:op  
    HotKeyMask[index]=0; U1RU2M]v  
    bRemoved=TRUE; Q$jEmmm%V[  
    KeyCount--; Dk1& <} I  
    break; 5!-TLwl`j\  
   } g: i5%1  
  } G7Nw}cVJ)  
 } / 3A6xPOg  
 return bRemoved; *Gsj pNr-  
} +y7z>Fwl  
%@$UIO,(  
void VerifyWindow() 0I}e>]:I  
{ 'B@`gA  
 for(int i=0;i<MAX_KEY;i++){ m[hL GD'Fi  
  if(hCallWnd!=NULL){ %!aU{E|@_  
   if(!IsWindow(hCallWnd)){ gI+8J.AG=  
    hCallWnd=NULL; FG?Mc'r&  
    HotKey=0; G\.~/<Mg+  
    HotKeyMask=0; Xn7G2Yp  
    KeyCount--; U& ?hG>  
   } SI(f&T(  
  } | ,8z" g  
 } .;#T<S "  
} q=1 N&#R G  
uuzV,q  
BOOL CHookApp::InitInstance() .*O*@)}Ud  
{ L/3A g* ]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Q eeV<  
 hins=AfxGetInstanceHandle(); "wUIsuG/p  
 InitHotkey(); pYr"3BwG  
 return CWinApp::InitInstance(); m[DQ;`Y  
} rhv~H"qzW  
3Ax'v|&Hg  
int CHookApp::ExitInstance() ((y|?Z$  
{ %X}ZX|{O  
 VerifyWindow(); 8K%N7RL|  
 UnInit(); #-{<d% qk  
 return CWinApp::ExitInstance(); ,_z79tC{s  
} [KDxB>R<{  
`L1,JE` q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file P_bB{~$4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b R\7j+*&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ XS<>0YM  
#if _MSC_VER > 1000 $vn6%M[  
#pragma once 3JazQU  
#endif // _MSC_VER > 1000 #3uv^m LGa  
(vXr2Z<l  
class CCaptureDlg : public CDialog WBe0^=x  
{ 4GYi'  
 // Construction lExQp2E  
 public: WQ|:TLQ  
  BOOL bTray; J^!;$Hkd  
  BOOL bRegistered; ;vx5 =^7P  
  BOOL RegisterHotkey(); @"w4R6l+*  
  UCHAR cKey; CH++3i2&  
  UCHAR cMask; ep>!jMhJa  
  void DeleteIcon(); hp dI5  
  void AddIcon(); *k?:k78L  
  UINT nCount; E)b$;'  
  void SaveBmp(); #2Rz=QI  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `/| *u  
  // Dialog Data }F08o,`?  
  //{{AFX_DATA(CCaptureDlg) 4pmeu:26  
  enum { IDD = IDD_CAPTURE_DIALOG }; =lacfPS  
  CComboBox m_Key; U,GSWMI/K  
  BOOL m_bControl; yD[d%w  
  BOOL m_bAlt; Cq5.gkS<  
  BOOL m_bShift; Mf5j'n  
  CString m_Path; kHM Jh~  
  CString m_Number; ]m1fo'  
  //}}AFX_DATA UpoSC  
  // ClassWizard generated virtual function overrides #G9 W65f  
  //{{AFX_VIRTUAL(CCaptureDlg) sz7*x{E  
 public: kc'$4 J4Tw  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %VHy?!/  
 protected: (leX` SN0u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @N'n>8Wn  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [9E~=A#  
  //}}AFX_VIRTUAL \PX4>/d@y  
  // Implementation }D1x%L  
 protected: G?Et$r7:R  
  HICON m_hIcon; `kKssU<  
  // Generated message map functions 8}%F`=Y0  
  //{{AFX_MSG(CCaptureDlg) =vThtl/azD  
  virtual BOOL OnInitDialog(); c[@_t.%)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {X,%GI  
  afx_msg void OnPaint(); sG g458  
  afx_msg HCURSOR OnQueryDragIcon(); lg^'/8^f  
  virtual void OnCancel(); r[9m-#)>  
  afx_msg void OnAbout(); X4!93  
  afx_msg void OnBrowse(); UB~K/r`.|  
  afx_msg void OnChange(); e02Hf{eOfw  
 //}}AFX_MSG Ae5A@4  
 DECLARE_MESSAGE_MAP() 4KPn V+h"b  
}; O>`k@X@9/  
#endif kUBE+a6#  
?<Qbp;WBo  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m:BzIcW<\  
#include "stdafx.h" ]2zM~  
#include "Capture.h" Jv~R/qaaD  
#include "CaptureDlg.h" +%5L2/n7  
#include <windowsx.h> <H64L*,5'7  
#pragma comment(lib,"hook.lib") :8S;34Y;  
#ifdef _DEBUG 74e=zW?  
#define new DEBUG_NEW b42%^E  
#undef THIS_FILE ;@+ |]I  
static char THIS_FILE[] = __FILE__; FgdnX2s J  
#endif cXXZ'y>FP  
#define IDM_SHELL WM_USER+1 -"-.Z&#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,fjY|ip  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \zd[A~!  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; u%-]-:c  
class CAboutDlg : public CDialog pl8b&bLzi  
{ ~cU1 /CW8  
 public: d+n2 c`i  
  CAboutDlg(); ;<~f-D,  
  // Dialog Data gUiO66#x  
  //{{AFX_DATA(CAboutDlg) 082}=Tsx   
  enum { IDD = IDD_ABOUTBOX }; Xj, %t}  
  //}}AFX_DATA We6eAP/Z  
  // ClassWizard generated virtual function overrides ED0cnr\yG  
  //{{AFX_VIRTUAL(CAboutDlg) S5>s&  
 protected: !~ o%KQt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [$3+5K#  
  //}}AFX_VIRTUAL 2V~E <K-  
  // Implementation Om.%K>V  
 protected: /gAT@Vx  
  //{{AFX_MSG(CAboutDlg) ^f[6NYS?  
  //}}AFX_MSG P9!awLM-  
  DECLARE_MESSAGE_MAP() he|Q (?  
}; "{<X! ^u>  
qrMED_(D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~+.=  
{ z ]f(lwo{  
 //{{AFX_DATA_INIT(CAboutDlg) #-|fdcb  
 //}}AFX_DATA_INIT 1dvP2E  
} o Mz{j:  
Ry95a%&/s  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XPhP1 ^>\  
{ Dgz, Uad8f  
 CDialog::DoDataExchange(pDX); n bxY'`8F  
 //{{AFX_DATA_MAP(CAboutDlg) 81nD:]7  
 //}}AFX_DATA_MAP )\])?q61  
} y;o - @]  
^%!{qAp}Z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [%k8l~ 6  
 //{{AFX_MSG_MAP(CAboutDlg) R*GBxJaw  
 // No message handlers H*]Vs=1  
 //}}AFX_MSG_MAP 5V 2ZAYV  
END_MESSAGE_MAP() T]wC?gQG  
'VV U-)(8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9!Av sC9  
: CDialog(CCaptureDlg::IDD, pParent) G]h_z|$K  
{ >5O~SF.  
 //{{AFX_DATA_INIT(CCaptureDlg) SM~~:  
  m_bControl = FALSE; gk%01&_>4  
  m_bAlt = FALSE; V u")%(ix  
  m_bShift = FALSE; B}[CU='P*  
  m_Path = _T("c:\\"); =!-}q  
  m_Number = _T("0 picture captured."); ge`GQ>  
  nCount=0; 'p5M|h\:T  
  bRegistered=FALSE; &~2m@X(o  
  bTray=FALSE; NL]_;\ h  
 //}}AFX_DATA_INIT K/9Jx(I,qL  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Cl '$*h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]QlW{J  
} *I :c@iCNJ  
pZ8J\4+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) G:*vV#K  
{ OROvy  
 CDialog::DoDataExchange(pDX); $e1.y b%  
 //{{AFX_DATA_MAP(CCaptureDlg) 9(t(sP_  
  DDX_Control(pDX, IDC_KEY, m_Key); 7R:j^"I@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ezw*Lo!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); LqYyIbsvf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Tdh(J",d  
  DDX_Text(pDX, IDC_PATH, m_Path); {|>'(iqH"w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fTXip)n!r  
 //}}AFX_DATA_MAP P;"moluE;  
} @Ommd{0M  
# fqrZ9:@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8XJi}YPQ  
//{{AFX_MSG_MAP(CCaptureDlg) 1j<uFhi>  
 ON_WM_SYSCOMMAND() J2}poNmm  
 ON_WM_PAINT()  kNK0KL  
 ON_WM_QUERYDRAGICON() =F|9 ac9X  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j-d&4,a:c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \^6[^\@[  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7;+G)44  
//}}AFX_MSG_MAP Hc\C0V<  
END_MESSAGE_MAP() UYxn? W.g  
SY|K9$M^  
BOOL CCaptureDlg::OnInitDialog() z&QfZs  
{ o/3.U=px~  
 CDialog::OnInitDialog(); \ Bj{.jL  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); e1g3a1tnWl  
 ASSERT(IDM_ABOUTBOX < 0xF000); /4O))}TX  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WowT!0$  
 if (pSysMenu != NULL) $y6 <2w%b  
 { U;/2\Ii  
  CString strAboutMenu; QM8Ic,QFvo  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _<RTes  
  if (!strAboutMenu.IsEmpty()) PR5N:Bw  
  { |Uics:cQC  
   pSysMenu->AppendMenu(MF_SEPARATOR); {C&U q#V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1UK= t  
  } f I=G>[  
 }  dwk%!%  
 SetIcon(m_hIcon, TRUE); // Set big icon tC|?Kl7  
 SetIcon(m_hIcon, FALSE); // Set small icon i.'"`pn_  
 m_Key.SetCurSel(0); (o*YGYC  
 RegisterHotkey(); 7d R?70Sz  
 CMenu* pMenu=GetSystemMenu(FALSE); #f"eZAQ {  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Nl[&rZ-&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S3/%;=|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1J0gjO)AZ  
 return TRUE; // return TRUE unless you set the focus to a control /?r A|  
} l<XYDb~op  
ntLEk fK{  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8\68NG6o  
{ <oJ?J^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?fH1?Z\'K  
 { %SB4_ r*<  
  CAboutDlg dlgAbout; /pjl6dJ t  
  dlgAbout.DoModal(); "LTw;& y  
 } A:ts_*  
 else =s!0EwDH3  
 { Mv%Qze,\V^  
  CDialog::OnSysCommand(nID, lParam); 27 XM&ZrZ  
 } hYpxkco"4'  
} I'*,<BPG  
k Nc- @B  
void CCaptureDlg::OnPaint() p/ xlR[  
{ W+ ;=8S  
 if (IsIconic()) (=uT*Cb  
 { C*ep8{B  
  CPaintDC dc(this); // device context for painting ewd eC  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mH\zSk  
  // Center icon in client rectangle i#>t<g`l  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^85Eveu  
  int cyIcon = GetSystemMetrics(SM_CYICON); Awa| (]  
  CRect rect;  nBp6uNK[  
  GetClientRect(&rect); rwJ U;wy  
  int x = (rect.Width() - cxIcon + 1) / 2; l,lqhq\  
  int y = (rect.Height() - cyIcon + 1) / 2; \{`^Q+<  
  // Draw the icon qK7:[\T|?T  
  dc.DrawIcon(x, y, m_hIcon); (Ff}Y.4  
 } g,]o+nT  
 else ViiJDYT>E<  
 { ('J@GTe@xj  
  CDialog::OnPaint(); aC`>~uX##V  
 } k*?T^<c3  
} D& pn@6bB  
@Pk<3.S0  
HCURSOR CCaptureDlg::OnQueryDragIcon() B>c$AS\5y  
{ {,JO}Dmu5  
 return (HCURSOR) m_hIcon; Mq<ob+  
} ;Tnid7:S  
`$Rgn3  
void CCaptureDlg::OnCancel() Hghd Ts  
{ jz_Y|"{`v  
 if(bTray) ^P@:CBO  
  DeleteIcon(); 'UhHcMh:  
  CDialog::OnCancel(); Fn .J tIu  
} ;+XrCy!.)L  
J@:Q(  
void CCaptureDlg::OnAbout() pWKE`x^  
{ WfaMu| L  
 CAboutDlg dlg; 1W'Ai"DLw  
 dlg.DoModal(); SbGdcCB  
} yn}Dj9(q  
H;4QuB'^  
void CCaptureDlg::OnBrowse() ,B'=$PO%  
{ y:98}gW`n  
 CString str; nfF$h}<o+  
 BROWSEINFO bi; \4wMv[;7  
 char name[MAX_PATH]; #dae^UjM  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); uKAI->"  
 bi.hwndOwner=GetSafeHwnd(); ;iuwIdo6c  
 bi.pszDisplayName=name; tgKr*8t{  
 bi.lpszTitle="Select folder"; pM@8T25=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; GqxnB k1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dvjj"F'Bf  
 if(idl==NULL) f2x!cL|Kx?  
  return; '27$x&6>S  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xx!8cvD4?  
 str.ReleaseBuffer(); SPE)db3  
 m_Path=str; v^@)&,  
 if(str.GetAt(str.GetLength()-1)!='\\') D<69xT,  
  m_Path+="\\"; _l9fNf!@  
 UpdateData(FALSE); |\Jnr3)  
} ,:PMS8pS  
@ &N  
void CCaptureDlg::SaveBmp() A]!0Z:{h%  
{ 9oJM?&i  
 CDC dc; s0dP3tz>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,Tr&`2w  
 CBitmap bm; k!x|oC0  
 int Width=GetSystemMetrics(SM_CXSCREEN); =KHb0d |.  
 int Height=GetSystemMetrics(SM_CYSCREEN); @CzFzVmF"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]S4"JcM  
 CDC tdc; I :<,9.   
 tdc.CreateCompatibleDC(&dc); xg/(  
 CBitmap*pOld=tdc.SelectObject(&bm); uQvTir*e  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .4\I?  
 tdc.SelectObject(pOld); Y M:9m)  
 BITMAP btm; 9k ~8n9  
 bm.GetBitmap(&btm); 'r7[9[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :@i+yN cV  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~'%d]s+q  
 BITMAPINFOHEADER bih; G/p\MzDko  
 bih.biBitCount=btm.bmBitsPixel; G^t)^iI"'  
 bih.biClrImportant=0; )iw-l~y;  
 bih.biClrUsed=0; FDD=I\Ic  
 bih.biCompression=0; ~\JB)ca.  
 bih.biHeight=btm.bmHeight; Zb=NcEPGy  
 bih.biPlanes=1; Y:;_R=M  
 bih.biSize=sizeof(BITMAPINFOHEADER); 9SsVJ<9,R  
 bih.biSizeImage=size; QIMd`c  
 bih.biWidth=btm.bmWidth; YCiG~y/~  
 bih.biXPelsPerMeter=0; T;(,9>Qsu  
 bih.biYPelsPerMeter=0; 76rv$z{g^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); X1(ds*'Kv  
 static int filecount=0; Gt#r$.]W?o  
 CString name; y\^zxG*]'  
 name.Format("pict%04d.bmp",filecount++); bK%F_v3'  
 name=m_Path+name; [<f2h-V$  
 BITMAPFILEHEADER bfh; *fc8M(]&d  
 bfh.bfReserved1=bfh.bfReserved2=0; 6d]4 %QT  
 bfh.bfType=((WORD)('M'<< 8)|'B'); a%Q`R;W  
 bfh.bfSize=54+size; c qCNk  
 bfh.bfOffBits=54; ):PN0.H8  
 CFile bf; xF!IT"5D  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wA$7SWC  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Eh8GqFEM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }&=l)\e  
  bf.WriteHuge(lpData,size); 5 NYS@76o7  
  bf.Close(); }PK4 KRn  
  nCount++; P1[.[q/-e  
 } DGGySO6=$e  
 GlobalFreePtr(lpData); 5go)D+6s  
 if(nCount==1) I[&x-}w  
  m_Number.Format("%d picture captured.",nCount); 8(4!x$,Z5  
 else .5; JnJI  
  m_Number.Format("%d pictures captured.",nCount); Pr} l y  
  UpdateData(FALSE); [8za=B/  
} kEq~M10  
)q_,V"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dY}5Kmt  
{ HE+'fQ!R  
 if(pMsg -> message == WM_KEYDOWN) U>*@VOgB  
 { >bV3~m$a+  
  if(pMsg -> wParam == VK_ESCAPE) ?<t?G  
   return TRUE; OE(y$+L3_I  
  if(pMsg -> wParam == VK_RETURN) ]~]TZb  
   return TRUE; y/S3ZJY  
 } #9TL5-1y  
 return CDialog::PreTranslateMessage(pMsg); T%%EWa<a  
}  P s>Y]  
[xM&Jdf8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,M`1 k  
{ #9(+)~irz`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {D8opepO)  
  SaveBmp(); +ZjDTTk  
  return FALSE; 25Z} .))  
} W]Xwt'ABz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %R4 \[e  
 CMenu pop; DtBvfYO8)>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @Pc7$qD%  
 CMenu*pMenu=pop.GetSubMenu(0); OiA uL:D  
 pMenu->SetDefaultItem(ID_EXITICON); !q$VnqFk  
 CPoint pt; &w^9#L  
 GetCursorPos(&pt); vGsAM* vw6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); vh.8m $,  
 if(id==ID_EXITICON) Os[z >H?  
  DeleteIcon(); m<j;f  
 else if(id==ID_EXIT) n#"G)+h3#  
  OnCancel(); oX^N>w0F  
 return FALSE; CP9Q|'oJ  
} 6P@K]jy& n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cu1!WD  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8zMGpY#  
 AddIcon(); rEp\ld  
 return res; C"n!mr{srt  
} O\Y*s  
3. dSS  
void CCaptureDlg::AddIcon() w|G7h=  
{ fPTLPcPP  
 NOTIFYICONDATA data; TqN@l\  
 data.cbSize=sizeof(NOTIFYICONDATA); v @M6D}  
 CString tip; 92Gfxld\  
 tip.LoadString(IDS_ICONTIP); uy2~<)  
 data.hIcon=GetIcon(0); -,*m\Fe}  
 data.hWnd=GetSafeHwnd(); a=ZVKb  
 strcpy(data.szTip,tip); =k d-rIBc  
 data.uCallbackMessage=IDM_SHELL; pFd{Tdh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 91R7Rrne  
 data.uID=98; vxf09v{-  
 Shell_NotifyIcon(NIM_ADD,&data); ABoB=0.l  
 ShowWindow(SW_HIDE); en|~`]HF  
 bTray=TRUE; yD \Kn{  
} e%:vLE 9  
Il\{m?Y  
void CCaptureDlg::DeleteIcon() |a])o  
{ O=}  
 NOTIFYICONDATA data; p5rq>&"  
 data.cbSize=sizeof(NOTIFYICONDATA); 93Gj#Mk  
 data.hWnd=GetSafeHwnd(); IIMf\JdM  
 data.uID=98; T*B`8P  
 Shell_NotifyIcon(NIM_DELETE,&data); 'S}3lsIE  
 ShowWindow(SW_SHOW); hB<(~L? A]  
 SetForegroundWindow(); ghW`xm87  
 ShowWindow(SW_SHOWNORMAL); _)pOkS  
 bTray=FALSE; +Goh`!$Rj9  
} |#t^D.j  
!ckluj  
void CCaptureDlg::OnChange() IX 6 jb"  
{ }Uj-R3]}K  
 RegisterHotkey(); HrLws95'  
} _~1O#*|4  
eCJtNPd  
BOOL CCaptureDlg::RegisterHotkey() <}&J|()  
{ !b0A %1W;  
 UpdateData(); yo_zc<  
 UCHAR mask=0; J s33S)  
 UCHAR key=0; n=DmdQ}  
 if(m_bControl) #(}{*d R  
  mask|=4; FDF DB  
 if(m_bAlt) x/]G"?Uix  
  mask|=2; 6E ^m*la%  
 if(m_bShift) c'?EI EP  
  mask|=1; "<egm^Yq  
  key=Key_Table[m_Key.GetCurSel()]; RI'}C`%v  
 if(bRegistered){ Z8h;3Ek  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); MsIaMW_  
  bRegistered=FALSE; bly `m p8#  
 } 3LQ u+EsS  
 cMask=mask; ?^:5`  
 cKey=key; :Id8N~g  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [KGj70|~  
 return bRegistered; \{*`-P v  
} g|^U?|;p  
mV}8s]29  
  四、小结 ;x_T*} CH  
to_dNJbv  
  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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