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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: HYD"#m'TkB  
  f. FYR|%tq  
  一、实现方法 M#~Cc~oT  
w:?oTuw  
  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: 'bo~%WA]n  
XLL/4)  
#pragma data_seg("shareddata") |!"2fI  
HHOOK hHook =NULL; //钩子句柄 L{(QpgHZ  
UINT nHookCount =0; //挂接的程序数目 #B:hPZM1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \ gLHi~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |b*? qf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^4,a8`  
static int KeyCount =0; )hk   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tI7:5Cm  
#pragma data_seg() G3rj`Sg^c  
hi0R.V&  
  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。 L+CyQq  
TZ2=O<Kj  
  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: :'*DPB-  
4dhvFGlW  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `67[O4$<  
cKey,UCHAR cMask) d)pV;6%[$q  
{ QF&W`c  
 BOOL bAdded=FALSE; !zPa_`P  
 for(int index=0;index<MAX_KEY;index++){ Db6om7N  
  if(hCallWnd[index]==0){ |\U5) ,m  
   hCallWnd[index]=hWnd; W2z*91$  
   HotKey[index]=cKey; Sp}tD<V  
   HotKeyMask[index]=cMask; N_pJk2E  
   bAdded=TRUE; 1qf!DMcdZ  
   KeyCount++; oiX+l5`pz  
   break; tl><"6AIP  
  } 7{I h_.#  
 } 1[jb)j1  
 return bAdded; |i ZfYi&^  
} t`+'r}=d  
//删除热键 h}]fn A  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K^ B%/T]d  
{ J,zO2572u  
 BOOL bRemoved=FALSE; Q",0F{'  
 for(int index=0;index<MAX_KEY;index++){ v76D3'8  
  if(hCallWnd[index]==hWnd){ e0J6Ae4V[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z,VD=Hnz  
    hCallWnd[index]=NULL; LrAT Sq@  
    HotKey[index]=0; Ma+$g1$  
    HotKeyMask[index]=0; QK+(g,)_86  
    bRemoved=TRUE; ed:@C?  
    KeyCount--; Z7RiPSdxp  
    break; +3&z N(  
   } qA!]E^0*Ke  
  } glDh([  
 } MW PvR|Q  
 return bRemoved; 2 ho>eRX  
} )=-0M9e.{  
KID,|K  
A0Zt8>w  
  DLL中的钩子函数如下: \#rIQOPl?  
Vo7dAHHL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %s&ChM?8F  
{ ;\[(- )f!=  
 BOOL bProcessed=FALSE; y| Ir._bt  
 if(HC_ACTION==nCode) 8,atX+tc  
 { r" K':O6y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k<cgO[m   
   switch(wParam) L*Me."*  
   {  # hlCs  
    case VK_MENU: ^k Cn*&  
     MaskBits&=~ALTBIT; |QMhMGjV  
     break; V=lfl1Ev0J  
    case VK_CONTROL: I8QjKI (  
     MaskBits&=~CTRLBIT; l983vKr  
     break; x ul]m*Z  
    case VK_SHIFT: IXb}AxB f  
     MaskBits&=~SHIFTBIT; r YF #^  
     break; i,|0@Vy  
    default: //judge the key and send message OQ,NOiNkap  
     break; ?_v{| YI=  
   } aDehqP6vf  
   for(int index=0;index<MAX_KEY;index++){ @c ~)W8  
    if(hCallWnd[index]==NULL)  y2+p1  
     continue; MSV2ip3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A.D{.a  
    { gd0Vp Xf'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |,aG%MTL  
     bProcessed=TRUE; 1]}#)-  
    } Y2O"]phi@  
   } 8HZs>l  
  } lhi_6&&[8  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;r6jx"i  
   switch(wParam) Nr0 (E   
   { 9{$'S 4  
    case VK_MENU: Vp<seO;7o  
     MaskBits|=ALTBIT; LC})ciWa  
     break;  ru`U'  
    case VK_CONTROL: 9W8]8sUeG  
     MaskBits|=CTRLBIT; %J8|zKT5t  
     break; gN>2xnh'm  
    case VK_SHIFT: r@{~ 5&L  
     MaskBits|=SHIFTBIT; ,&d@O>$E:  
     break; A"aV'~>  
    default: //judge the key and send message Dk='+\  
     break; Q0\0f  
   } jn: NYJv  
   for(int index=0;index<MAX_KEY;index++){ ;P;((2_X9  
    if(hCallWnd[index]==NULL) Hk7q{`:N  
     continue; {VP$J"\e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k64."*X  
    { TI !a)X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |TE}`?y[g  
     bProcessed=TRUE; ~h"/Tce  
    } 8`b`QtGf  
   } .7 asW(  
  } *c)uGz'cD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $46{<4.  
   for(int index=0;index<MAX_KEY;index++){ -!)xQvagD.  
    if(hCallWnd[index]==NULL) x)UwV  
     continue; &h~Xq^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :d8W +|1u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cv(PP-'\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {,cCEXag%  
   } k/03ZxC-  
  } jt@SZI`  
 } #eN{!Niy&U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,KJw|x4}\  
} @ a4/ELx  
e;GU T:  
  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: 2..,Sk  
~Xlrvb}LP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x'zBK0i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )XfzLF7  
HAYMX:%  
  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: Jjl%R[mI  
ms_ VM>l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `+#G+Vu5  
{ [Px'\ nVf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }P3tn  
 { O,<IGO  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 O'GG Ti]e  
  SaveBmp(); vfB2XVc  
  return FALSE; +f0~D(d!_  
 } +x]9+D&  
 …… //其它处理及默认处理 lc6i KFyG  
} h8 G5GRD  
u4"SH(  
Uu7dSU  
  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。 i-U4RZE  
za'6Y*CGgX  
  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。 1 ^g t1o  
|+U<S~  
  二、编程步骤 f(D_FTTO  
]MtFf6&  
  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"; gq"k<C0  
3u>8\|8wz  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; h7X_S4p/Mg  
$ \*` }Y  
  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; |xoF49  
Cv)/7vyB8  
  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; (]*H[)F/  
q4UA]+-*  
  5、 添加代码,编译运行程序。 NA$zd(  
j%V["?)  
三、程序代码 )c/Fasfg[P  
|KYEK|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "&Qctk`<P  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) L5IbExjV  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <As9>5|%  
#if _MSC_VER > 1000 g`k?AM\  
#pragma once )U:2z-X&e  
#endif // _MSC_VER > 1000 ]ALc;lb-}  
#ifndef __AFXWIN_H__ QFPfIb/  
#error include 'stdafx.h' before including this file for PCH O;HY%  
#endif L?Yoh<  
#include "resource.h" // main symbols N:VX!w  
class CHookApp : public CWinApp %b?$@H-Re  
{ ^")F7`PF  
 public: ]=73-ywn]  
  CHookApp(); d {2  
  // Overrides mgZf3?,)  
  // ClassWizard generated virtual function overrides 1x~U*vbhQ  
  //{{AFX_VIRTUAL(CHookApp) `A/j1UWJ  
 public: wzjU,Mw e  
  virtual BOOL InitInstance(); w> xV  
  virtual int ExitInstance(); ]+DI.%   
  //}}AFX_VIRTUAL V2|3i}V"  
  //{{AFX_MSG(CHookApp) 4*Z6}"  
  // NOTE - the ClassWizard will add and remove member functions here. _kFYBd  
  // DO NOT EDIT what you see in these blocks of generated code ! K:y^OAZfV  
  //}}AFX_MSG 7?"y{R>E  
  DECLARE_MESSAGE_MAP() 3}1ssU"T  
}; l]2r)!Q7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4y}"Hy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HjWq[[Nz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =wi*Nd7L  
BOOL InitHotkey(); t j Vh^  
BOOL UnInit(); Vy G4(X va  
#endif )<4_:  
\nrP$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q}A=jew  
#include "stdafx.h" aaWJ* >rJ  
#include "hook.h" UFn8kBk  
#include <windowsx.h> M~6@20$oW  
#ifdef _DEBUG O$ !* %TL  
#define new DEBUG_NEW (y4#.vZh:  
#undef THIS_FILE o=fgin/E\  
static char THIS_FILE[] = __FILE__; smAC,-6 ]~  
#endif ^a9 oKI9n  
#define MAX_KEY 100 _'x8M  
#define CTRLBIT 0x04 ^b?2N/m@  
#define ALTBIT 0x02 > ^[z3T  
#define SHIFTBIT 0x01 PHM:W%g:  
#pragma data_seg("shareddata") IF k  
HHOOK hHook =NULL; t@bt6J .{  
UINT nHookCount =0; !$XHQLqF2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  ZC^C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }b["Jk\2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey qW^vz  
static int KeyCount =0; ?Ce#BwQ>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Vs 0 SXj  
#pragma data_seg() I12KT~z<r  
HINSTANCE hins; 7_KhV  
void VerifyWindow(); (d2@Mz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) q$ghLGz  
//{{AFX_MSG_MAP(CHookApp) \Mx JH[  
// NOTE - the ClassWizard will add and remove mapping macros here. r@)A k  
// DO NOT EDIT what you see in these blocks of generated code! @u4=e4eF`  
//}}AFX_MSG_MAP ? S=W&  
END_MESSAGE_MAP() ^gro=Bp(  
S9Y[4*//  
CHookApp::CHookApp() K3$` Kv>I  
{ _EYB 8e  
 // TODO: add construction code here, rE!1wc>L  
 // Place all significant initialization in InitInstance MXAEX2xmme  
} &w~Xa( uu  
0??Yr  
CHookApp theApp; 17UK1Jx,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R 4EEelSZu  
{ uf)Oy7FQ  
 BOOL bProcessed=FALSE; JSMPyj  
 if(HC_ACTION==nCode) p_terD:  
 { J0<p4%Cf  
  if((lParam&0xc0000000)==0xc0000000){// Key up W5DbFSgB  
   switch(wParam) CSn<]%GL  
   { .5tg4%l  
    case VK_MENU: ddpl Pzm#  
     MaskBits&=~ALTBIT; nf%4sIQ*x  
     break; 7$T8&Mh  
    case VK_CONTROL: ]gd/}m)1  
     MaskBits&=~CTRLBIT; )q?$p9  
     break; @] .VQ<X|0  
    case VK_SHIFT: ML!9:vz  
     MaskBits&=~SHIFTBIT; {/M\Q@j  
     break; r:.uBc&_  
    default: //judge the key and send message j64 4V|z  
     break; $@[)nvV\  
   } }~enEZ  
   for(int index=0;index<MAX_KEY;index++){ 5h_5Z~  
    if(hCallWnd[index]==NULL) Uxl(96  
     continue; pVokgUrC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $-pbw@7  
    { mc@M,2@D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nX x=1*X  
     bProcessed=TRUE; iK}v`xq  
    } .;Y x*]  
   } WVL#s?=g  
  } 2>y:N.  
  else if((lParam&0xc000ffff)==1){ //Key down @5Qoi~o  
   switch(wParam) B%b_/F]e  
   { fNhT;Bux  
    case VK_MENU: ,?b78_,2  
     MaskBits|=ALTBIT; V,4.$<e  
     break; 6Dzs?P  
    case VK_CONTROL: %O) Z  
     MaskBits|=CTRLBIT; af>3V(7  
     break; N~#D\X^t.  
    case VK_SHIFT: ,nE&Me&#J  
     MaskBits|=SHIFTBIT; j 2}v}  
     break; (wL3 +  
    default: //judge the key and send message Gp1EJ2d8  
     break; m6so]xr  
   } 1Ii| {vR  
   for(int index=0;index<MAX_KEY;index++) ph^4GBR   
   { 4]BJ0+|mT  
    if(hCallWnd[index]==NULL)  nP_=GI  
     continue; p?Sl}A@`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zc\S$+PM  
    { dq 8+m(7k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~/c5 hyTx  
     bProcessed=TRUE; ~zMKVM1Q.,  
    } mU]s7` %<>  
   } -Cj_B\  
  } z>:U{!5k  
  if(!bProcessed){ >(tO QeN  
   for(int index=0;index<MAX_KEY;index++){ b>=7B6 Aw  
    if(hCallWnd[index]==NULL) {})y^L  
     continue; IQ{?_'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) UX}*X`{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8eww7k^R  
   } =HPu {K$  
  } a/e\vwHLv  
 } Y +qus  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); TzY!D *%z  
} ,kE=TR.|  
Tf l;7w.(A  
BOOL InitHotkey() B!`\L!  
{ +!$dO'0nt,  
 if(hHook!=NULL){ :@e\'~7sH  
  nHookCount++; GN%<"I.  
  return TRUE; MgnE-6_c  
 } 0^iJlR2  
 else 44Qk;8*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OX)BP.h#  
  if(hHook!=NULL) "yri[X  
   nHookCount++; TolrEcI  
  return (hHook!=NULL); +E#PJ_H=F8  
} Vj7Hgc-,  
BOOL UnInit() nt`<y0ta  
{ 9RcM$[~  
 if(nHookCount>1){ ;&`:|Hf*  
  nHookCount--; `(T!>QVW+g  
  return TRUE; &<{}8/x8(  
 } YAMfP8S  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Xoi9d1fO  
 if(unhooked==TRUE){ vTcZ8|3e  
  nHookCount=0; &?}1AQAYg  
  hHook=NULL; @YNGxg~*g  
 } W^|J/Y48  
 return unhooked; #XL`S  
} - #Jj-t_Fe  
]c,l5u}A$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s<#N]mp'   
{ r$?Vx_f`Q  
 BOOL bAdded=FALSE; M/)B" q  
 for(int index=0;index<MAX_KEY;index++){ *s36O F!  
  if(hCallWnd[index]==0){ J;HkTT   
   hCallWnd[index]=hWnd; S ]b xQa+  
   HotKey[index]=cKey; F#^L9  
   HotKeyMask[index]=cMask; M)tv;!eQ  
   bAdded=TRUE; UC;=)  
   KeyCount++; x {vIT- f  
   break; -PXoMZx%  
  } 7A[Ogro  
 } jRwa0Px(  
 return bAdded; mOSCkp{<e  
}  mc~`  
6.UKB<sV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1::LN(`<  
{ K /8qB~J*  
 BOOL bRemoved=FALSE; 6*V8k%H  
 for(int index=0;index<MAX_KEY;index++){ }2mI*"%)\u  
  if(hCallWnd[index]==hWnd){ lkN'uZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ E7gL~4I  
    hCallWnd[index]=NULL; *CT.G'bQX  
    HotKey[index]=0; Bj+wayMi  
    HotKeyMask[index]=0; PgTDjEo  
    bRemoved=TRUE; YkVRl [  
    KeyCount--; @7]\y7D  
    break; p&m ^IWD  
   } _Z0\`kba+  
  } `+Xe'ey  
 } c-|kv[\a  
 return bRemoved; \E~Q1eAJT  
} |thad!?  
CJ:uYXJJ:z  
void VerifyWindow() 8eN%sm  
{ rF'<r~Lw  
 for(int i=0;i<MAX_KEY;i++){ >waN;&>/  
  if(hCallWnd!=NULL){ k5g@myb-  
   if(!IsWindow(hCallWnd)){ "TUPYFK9  
    hCallWnd=NULL; |C|:i@c H  
    HotKey=0; +{'lZa  
    HotKeyMask=0; R^|!^[WE  
    KeyCount--; 9Dy)nm^  
   } {DSyV:   
  } ` -yhl3si  
 } cJ2y)`  
} %5`r-F  
+fkP+RVY  
BOOL CHookApp::InitInstance() QT7_x`#J~o  
{ \y@ eBW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8KZ$ F>T]>  
 hins=AfxGetInstanceHandle(); Pb3EnNqYbM  
 InitHotkey();  w}"!l G  
 return CWinApp::InitInstance(); |E? ,xWN  
} |c=d;+  
J/L)3y   
int CHookApp::ExitInstance() +&(J n  
{ g&q^.7c}  
 VerifyWindow(); 8b{U tT  
 UnInit(); yg`E22  
 return CWinApp::ExitInstance(); /%-o.hT  
} FzA{U O  
bd.j,4^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q})t<l+L  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3g^IXm:K$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ PVZEB  
#if _MSC_VER > 1000 9x4wk*z  
#pragma once +BU0 6lLD  
#endif // _MSC_VER > 1000 B*32D8t`u  
j-j'phK  
class CCaptureDlg : public CDialog RFhU#  
{ <` #,AVH  
 // Construction f(^33k  
 public: ^NY+wR5Sn  
  BOOL bTray; 7xz#D4[  
  BOOL bRegistered; |}:e+?{o  
  BOOL RegisterHotkey(); Zp^)_ 0  
  UCHAR cKey; 1V#0\1sj  
  UCHAR cMask; 8rla0d@  
  void DeleteIcon(); +}&pVe\t  
  void AddIcon(); t;h+Cf4  
  UINT nCount; r$94J'_  
  void SaveBmp(); }{P&idkv  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <.;@ksCPW{  
  // Dialog Data vM5k4%D  
  //{{AFX_DATA(CCaptureDlg) (H'_KPK  
  enum { IDD = IDD_CAPTURE_DIALOG }; G[ ,,L  
  CComboBox m_Key; ?Ozk^#H[  
  BOOL m_bControl; i:MlD5 F  
  BOOL m_bAlt; 1hF2eNh  
  BOOL m_bShift; \o0z@Ntq  
  CString m_Path; |}l@w +N3  
  CString m_Number; M0Lon/%  
  //}}AFX_DATA b(g_.1[  
  // ClassWizard generated virtual function overrides 6'S5sRA  
  //{{AFX_VIRTUAL(CCaptureDlg) YCtIeq%  
 public: ": mCZUt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]kyle3#-~  
 protected: pHq{S;R2G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .WxFm@]/\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  s$K@X `  
  //}}AFX_VIRTUAL z?8zFP  
  // Implementation J,CJPUf&  
 protected: /+Wb6{lY  
  HICON m_hIcon; S~]8K8"sT  
  // Generated message map functions n P0Ziu'{  
  //{{AFX_MSG(CCaptureDlg) C~3@M<X  
  virtual BOOL OnInitDialog(); a.5zdoH_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b>G qNf!  
  afx_msg void OnPaint(); >^M!@=/?J  
  afx_msg HCURSOR OnQueryDragIcon(); mABwM$_  
  virtual void OnCancel(); ?FkQe~FN{  
  afx_msg void OnAbout(); at_dmU2[7  
  afx_msg void OnBrowse(); JrY"J]/  
  afx_msg void OnChange(); 9{au leu R  
 //}}AFX_MSG BiVd ka  
 DECLARE_MESSAGE_MAP() 8#[%?}tK  
}; AT2NC6{M  
#endif 8 /:X& &  
mBYS"[S(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {s9y@c*15.  
#include "stdafx.h" : OS mr  
#include "Capture.h" Dx9$H++6$X  
#include "CaptureDlg.h" | 7t=\  
#include <windowsx.h> )Mm;9UA  
#pragma comment(lib,"hook.lib") w*|=k~z  
#ifdef _DEBUG Sn{aHH  
#define new DEBUG_NEW l4R<`b\Jt  
#undef THIS_FILE eH"qI2A  
static char THIS_FILE[] = __FILE__; 5$ (b3]  
#endif 'fp<FeTg  
#define IDM_SHELL WM_USER+1 NgDZ4&L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  eLe,=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 75QXkJu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [| c@Yw  
class CAboutDlg : public CDialog j]cXLY  
{ A8A:@-e8A  
 public: KT]J,b  
  CAboutDlg(); H| eD/6K  
  // Dialog Data N]O{T_5-0  
  //{{AFX_DATA(CAboutDlg) GN~[xXJU  
  enum { IDD = IDD_ABOUTBOX }; E@\d<c.  
  //}}AFX_DATA Q"l"p:n%n  
  // ClassWizard generated virtual function overrides I_jM-/3b  
  //{{AFX_VIRTUAL(CAboutDlg) RE(=! 8lGR  
 protected: f4A4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $?CBX27AV  
  //}}AFX_VIRTUAL qr<-eJf  
  // Implementation UH1S_:6  
 protected: ;r0|_mnf  
  //{{AFX_MSG(CAboutDlg) 0|K/=dh5+  
  //}}AFX_MSG 4EaS g#  
  DECLARE_MESSAGE_MAP() .O@q5G  
}; !#_h2a  
o|p;6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KV) Hywl`  
{ mTI\,x%<OC  
 //{{AFX_DATA_INIT(CAboutDlg) $)kBz*C[  
 //}}AFX_DATA_INIT } Y7W1$he  
} =:v><  
VDb,$i.Z0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8VAYIxRv  
{ 6B!j(R  
 CDialog::DoDataExchange(pDX); E9Qd>o  
 //{{AFX_DATA_MAP(CAboutDlg) D:RBq\8  
 //}}AFX_DATA_MAP u+I r:k  
} /w}B07.  
[EW$7 se~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )$Dcrrj  
 //{{AFX_MSG_MAP(CAboutDlg) N c&i) qh  
 // No message handlers .5#tB*H  
 //}}AFX_MSG_MAP |R &3/bEr  
END_MESSAGE_MAP() uZ=UBir  
g~$GE},,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @FnI?Rx  
: CDialog(CCaptureDlg::IDD, pParent) 7am/X.  
{ >TQBRA;'  
 //{{AFX_DATA_INIT(CCaptureDlg) GP7) m  
  m_bControl = FALSE; >TY5ZRB  
  m_bAlt = FALSE; fW4cHB 9|  
  m_bShift = FALSE; [iO$ c]!H  
  m_Path = _T("c:\\"); ,;+91lR3  
  m_Number = _T("0 picture captured."); P(YG@  
  nCount=0; NP<F==,  
  bRegistered=FALSE; HIWmh4o/.  
  bTray=FALSE; zw%n!wc_\  
 //}}AFX_DATA_INIT Aa\=7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $ <>EwW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bVAgul=__  
} %t5BB$y  
bCaPJ!ZO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4 HJZ^bq9|  
{ +DbWMm  
 CDialog::DoDataExchange(pDX); "o5gQTwb  
 //{{AFX_DATA_MAP(CCaptureDlg) mC[U)` ey  
  DDX_Control(pDX, IDC_KEY, m_Key); 9Qs"X7iH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yV+ E;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nTlv'_Y(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &T|&D[@  
  DDX_Text(pDX, IDC_PATH, m_Path); u8k{N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5{d9,$%8&  
 //}}AFX_DATA_MAP ,Dii?P  
} [K4+G]6  
0Z) ;.l^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h,WY2Hr  
//{{AFX_MSG_MAP(CCaptureDlg) +GPT:\*q6  
 ON_WM_SYSCOMMAND() ,;=( )-  
 ON_WM_PAINT() ;MRC~F=  
 ON_WM_QUERYDRAGICON() ;~gd<KK  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) cf[u%{ 6Y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $ DZQdhv  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1N$gE  
//}}AFX_MSG_MAP ]Re~V{uh  
END_MESSAGE_MAP() sG1]A:_<C  
ap$ tu3j  
BOOL CCaptureDlg::OnInitDialog() (HrkUkw  
{ N5rG.6K  
 CDialog::OnInitDialog(); i\Q"a B"r  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c] >&6-;rf  
 ASSERT(IDM_ABOUTBOX < 0xF000); >2Qqa;nx|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); PVkN3J  
 if (pSysMenu != NULL) (P>eWw\0  
 { o"ah\"#el  
  CString strAboutMenu; ~ Dp:j*H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #G , *j  
  if (!strAboutMenu.IsEmpty()) Pdm6u73  
  { L..X)-D2 n  
   pSysMenu->AppendMenu(MF_SEPARATOR); `2(R}zUHN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D "] [&m  
  } 9M7(_E;)B  
 } t{S{!SF4  
 SetIcon(m_hIcon, TRUE); // Set big icon $Z%aGc*  
 SetIcon(m_hIcon, FALSE); // Set small icon M}oFn}-T9a  
 m_Key.SetCurSel(0); gM5p1?E  
 RegisterHotkey(); X,Q=n2X?3  
 CMenu* pMenu=GetSystemMenu(FALSE); tId !C  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IL6f~!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "k1Tsd-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =@jMx^A"  
 return TRUE; // return TRUE unless you set the focus to a control %`\_l  
} mv%:[+!  
4@mXtA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) } @fu~V/  
{ M+R)P +  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) j.'"CU  
 { \`p~b(  
  CAboutDlg dlgAbout; FvNSu"O~K1  
  dlgAbout.DoModal(); v.LUK  
 } wAOVH].  
 else V&+$V q  
 { eeJt4DV8v  
  CDialog::OnSysCommand(nID, lParam); B%g:Z  
 } :k )<1ua  
} eZod}~J8  
ocuVDC  
void CCaptureDlg::OnPaint() |o=\9:wV  
{ !>2\OSp!  
 if (IsIconic()) v{{2<,l  
 { hYUV9k:  
  CPaintDC dc(this); // device context for painting 73z|'0.  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vwH7/+  
  // Center icon in client rectangle .q9|XDqQc  
  int cxIcon = GetSystemMetrics(SM_CXICON); $E,DxDT  
  int cyIcon = GetSystemMetrics(SM_CYICON); HJ1\FO9\  
  CRect rect; +$QL0|RL  
  GetClientRect(&rect); '/Cz{<,  
  int x = (rect.Width() - cxIcon + 1) / 2; Ce'2lo  
  int y = (rect.Height() - cyIcon + 1) / 2; .nF  
  // Draw the icon k q.h\[  
  dc.DrawIcon(x, y, m_hIcon); AW&s-b%P  
 } l 75{JxZX  
 else O-lh\9{'R  
 { OZ14-}Lr5  
  CDialog::OnPaint(); U>-#('  
 } |Sv#f2`  
} 2[&-y[1  
$~@096`QL<  
HCURSOR CCaptureDlg::OnQueryDragIcon() PW//8lsR  
{ >Wit"p  
 return (HCURSOR) m_hIcon; ZFuJ2 :  
} @$yYljP  
cTa D{!zm5  
void CCaptureDlg::OnCancel() ?| LB:8  
{ hGo|2@sc  
 if(bTray) f uN XY-;  
  DeleteIcon(); 34^Cfh  
  CDialog::OnCancel(); 9c % Tv  
} cA SHgm  
+M]8_kE=+l  
void CCaptureDlg::OnAbout() S=amjcC  
{ |j}F$*SE[  
 CAboutDlg dlg; ,Y8X"~{A  
 dlg.DoModal(); 10 H!  
} qq_,"~  
^`MDP`M;  
void CCaptureDlg::OnBrowse() ~d `4W<1a  
{ ;GT)sI   
 CString str; Jb.u^3R@  
 BROWSEINFO bi; UYrzsUjg&  
 char name[MAX_PATH]; yi;t  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &FF. Ddt{  
 bi.hwndOwner=GetSafeHwnd(); ?[B[ F  
 bi.pszDisplayName=name; 2\tjeg  
 bi.lpszTitle="Select folder"; htrj3$q(4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M>gZVB,eP>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T<?BIQz(}  
 if(idl==NULL) +* {5ORq=  
  return; <slq1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KmOa^vY1.T  
 str.ReleaseBuffer(); >D4Ez  
 m_Path=str; 6jo&i  
 if(str.GetAt(str.GetLength()-1)!='\\') B]F7t4Y!  
  m_Path+="\\"; "I FGW4FnL  
 UpdateData(FALSE); $cU/Im`  
} R,+(JgJ  
Byj~\QMD|  
void CCaptureDlg::SaveBmp() r K)  
{ pP,bW~rk  
 CDC dc; HYmUxheN2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Hll}8d6[  
 CBitmap bm; Ht^2)~e~:  
 int Width=GetSystemMetrics(SM_CXSCREEN); Py]ci`27  
 int Height=GetSystemMetrics(SM_CYSCREEN); c!^}!32j)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =T4 w:  
 CDC tdc; s;WCz  
 tdc.CreateCompatibleDC(&dc); ucPMT0k  
 CBitmap*pOld=tdc.SelectObject(&bm); N`6|Y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,6Q-k4_  
 tdc.SelectObject(pOld); l*H"]6cXRL  
 BITMAP btm; n1(X%%2  
 bm.GetBitmap(&btm); &)jZ|Q~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K)\gbQ|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); m9c T}x&j  
 BITMAPINFOHEADER bih; r['C.S6  
 bih.biBitCount=btm.bmBitsPixel; 6|cl`}g_j  
 bih.biClrImportant=0; t3g! 5  
 bih.biClrUsed=0; i4rF~'h@  
 bih.biCompression=0; lB~'7r`  
 bih.biHeight=btm.bmHeight; $i>VI  
 bih.biPlanes=1; M?zAkHNS$  
 bih.biSize=sizeof(BITMAPINFOHEADER); P$Ru NF  
 bih.biSizeImage=size; a\_,_psK  
 bih.biWidth=btm.bmWidth; |raQ]b@t&  
 bih.biXPelsPerMeter=0; beZ| i 1:  
 bih.biYPelsPerMeter=0; n`Iy7X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3*2pacHpE  
 static int filecount=0; (r\h dLX  
 CString name; MXV4bgltT  
 name.Format("pict%04d.bmp",filecount++); 3~xOO*`o  
 name=m_Path+name; nn%xN\~<  
 BITMAPFILEHEADER bfh; D~&e.y/gHN  
 bfh.bfReserved1=bfh.bfReserved2=0; &~f_1<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )1 j2  
 bfh.bfSize=54+size; !OgoV22  
 bfh.bfOffBits=54; [`\Qte%UH  
 CFile bf; 'FFc"lqj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :K:gyVrC  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .Kwl8xRg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]_8 \g`"u  
  bf.WriteHuge(lpData,size); 3y,?>-  
  bf.Close(); 7'uc;5:  
  nCount++; !I_4GE,  
 } @{lnfOESl  
 GlobalFreePtr(lpData); uZI a-b  
 if(nCount==1) N&`ay{&`:  
  m_Number.Format("%d picture captured.",nCount); UOOme)\>  
 else :XZ pnjj  
  m_Number.Format("%d pictures captured.",nCount); 1Di&vpn0u  
  UpdateData(FALSE); uK5x[m  
} Mwc3@  
{2@96o2}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jMbK7 1K%  
{ g>zL{[e!  
 if(pMsg -> message == WM_KEYDOWN) LWV`xCr8R  
 { -;"l 5oX  
  if(pMsg -> wParam == VK_ESCAPE) J[wXG6M  
   return TRUE; 1_lL?S3,a@  
  if(pMsg -> wParam == VK_RETURN) -1JHhRr]  
   return TRUE; u`|fmVI  
 } \]%U?`A  
 return CDialog::PreTranslateMessage(pMsg); B4aZ3.&W  
} 3/FB>w gt  
oD\+ 5[x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O_^h 7   
{ >O~5s.1u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nVzo=+Yp  
  SaveBmp(); '7s!N F2  
  return FALSE; 54w-yY  
} a"0~_=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Shz;)0To  
 CMenu pop; m@~x*+Iz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));  U2$T}/@  
 CMenu*pMenu=pop.GetSubMenu(0); I r~X#$Upc  
 pMenu->SetDefaultItem(ID_EXITICON); d*L'`BBsp  
 CPoint pt; sXu+F2O  
 GetCursorPos(&pt); dZmq  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y>8?RX8  
 if(id==ID_EXITICON) q3`t0eLZ  
  DeleteIcon(); o:<3n,T  
 else if(id==ID_EXIT) ^dv>n]?  
  OnCancel(); jq{Ix  
 return FALSE; 2wQ CQ"  
} >qA&;M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]mA?TwD  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Uw"   
 AddIcon(); Xk'.t|  
 return res; `l#g`~L  
} 8t%1x|!  
a0.XJR{T"  
void CCaptureDlg::AddIcon() G\%hT5^  
{ za7wNe(s  
 NOTIFYICONDATA data; _wCSL.  
 data.cbSize=sizeof(NOTIFYICONDATA); t/|^Nt@XT  
 CString tip; Di*>PE@  
 tip.LoadString(IDS_ICONTIP); if>] )g2lr  
 data.hIcon=GetIcon(0); v*3:8Y,  
 data.hWnd=GetSafeHwnd(); uE(w$2Wi  
 strcpy(data.szTip,tip); 1CbC|q  
 data.uCallbackMessage=IDM_SHELL; ~_%[j8o&l  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u:ISwAp  
 data.uID=98; :%{7Q$Xv<  
 Shell_NotifyIcon(NIM_ADD,&data); Kl?1)u3^4  
 ShowWindow(SW_HIDE); {NR~>=~K-  
 bTray=TRUE; rNc>1}DDS  
} *F0N'*  
iQF93:#  
void CCaptureDlg::DeleteIcon() B|v fkX2f  
{ d@hJ=-4  
 NOTIFYICONDATA data; 16vfIUtb  
 data.cbSize=sizeof(NOTIFYICONDATA); #x21e }Li  
 data.hWnd=GetSafeHwnd(); K-ebAaiC  
 data.uID=98; z61 o6mb  
 Shell_NotifyIcon(NIM_DELETE,&data); $G3P3y: [  
 ShowWindow(SW_SHOW); -|mABHjx*  
 SetForegroundWindow(); *?{)i~  
 ShowWindow(SW_SHOWNORMAL); Wm 61  
 bTray=FALSE; s/V[tEC*z  
} t&_lpffv  
#LiC@>  
void CCaptureDlg::OnChange() RMXP)[  
{ \B)<<[ $  
 RegisterHotkey();  UWI5 /R  
} =E}/Z  
GfDA5v[  
BOOL CCaptureDlg::RegisterHotkey() @ 55Y2  
{ ',f[y:v;  
 UpdateData(); U|=y&a2Rb  
 UCHAR mask=0; *"@P2F&  
 UCHAR key=0; I,D=ixK  
 if(m_bControl) eC?N>wHH  
  mask|=4; /1*\*<cs  
 if(m_bAlt) Go4l#6  
  mask|=2; 5zU$_M  
 if(m_bShift) o%:eYl  
  mask|=1; g:HIiGN0Ic  
  key=Key_Table[m_Key.GetCurSel()]; 2sngi@\  
 if(bRegistered){ P+[R0QS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8MIHp[vm%  
  bRegistered=FALSE; Ne%X:h  
 } T~la,>p|}  
 cMask=mask; c}A^0,"z>  
 cKey=key; AOpfByw  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fOfp.`n  
 return bRegistered; YpJzRm{Ra  
} Hogr#Sn2  
|c) #zSv  
  四、小结 ec|IT0;  
%Xn)$Ti ~<  
  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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