社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 6207阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: ?F%,d{^  
  g"v-hTx  
  一、实现方法 AtlUxFX0S  
Rp"" &0  
  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: U{.yX7  
|NWo.j>4-  
#pragma data_seg("shareddata") RS[QZOoW}  
HHOOK hHook =NULL; //钩子句柄 lZ}H?n%  
UINT nHookCount =0; //挂接的程序数目 B}p{$g!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m:{IVvN_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 h-:te9p6>4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5F|oNI}$:  
static int KeyCount =0; _"c?[n  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 PeB7Q=d)K1  
#pragma data_seg() Zut"P3d=J  
U> 1voc  
  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。 @ **]o  
B"I^hrQ  
  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: QPpC_pZh  
 HO =\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 0=KyupwXC  
cKey,UCHAR cMask) t=(CCq_N,  
{ 5XA{<)$  
 BOOL bAdded=FALSE; z0-`D.D@\  
 for(int index=0;index<MAX_KEY;index++){ +/~;y{G..z  
  if(hCallWnd[index]==0){ ]PjJy/vkjj  
   hCallWnd[index]=hWnd; (\NZ)Ys  
   HotKey[index]=cKey; OAZ5I)D>  
   HotKeyMask[index]=cMask; <MBpV^Y}  
   bAdded=TRUE; -eoXaP{[  
   KeyCount++; a{7'qmN1  
   break; P>i[X0UnL  
  } YeCS`IXm  
 } :HQQ8uQfb  
 return bAdded; x.~AvJ  
} gCY%@?YyN  
//删除热键 Z |CL:)h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -mK;f$X  
{ EG[Rda  
 BOOL bRemoved=FALSE; +(3U_]Lu  
 for(int index=0;index<MAX_KEY;index++){ K.K=\ Y2  
  if(hCallWnd[index]==hWnd){ $4a;R I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DNl '}K1W  
    hCallWnd[index]=NULL; ;/g Bjp]H  
    HotKey[index]=0; e2l!L*[g  
    HotKeyMask[index]=0; h"DxgG  
    bRemoved=TRUE; 1x~dsM;q  
    KeyCount--; &;Jg2f%.  
    break; <^8&2wAkJ  
   } GY,HEe]2r  
  } &!5S'J %  
 } 9s'[p'[Z  
 return bRemoved; HTU?hbG(  
} ijR,%qg  
7awh__@  
V1Opp8  
  DLL中的钩子函数如下: )Cfk/OnRd  
TmIw?#q^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :N ~A7@  
{ `suEN @^  
 BOOL bProcessed=FALSE; $,9A?'  
 if(HC_ACTION==nCode) &;]KntxB  
 { R-V4Ju[:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 I8:A]  
   switch(wParam) yvp$s  
   {  U sS"WflB  
    case VK_MENU: HJeZm  
     MaskBits&=~ALTBIT; eQqx0+-0c  
     break; w[X/|O  
    case VK_CONTROL: qmx4hs8sh  
     MaskBits&=~CTRLBIT; ~dc~<hK  
     break; W2F*+M  
    case VK_SHIFT: R+y 9JE  
     MaskBits&=~SHIFTBIT; )D"E]  
     break; yO`HL'SMo  
    default: //judge the key and send message B LI 9(@  
     break; C=>IJ'G  
   } ,`O.0e4pn  
   for(int index=0;index<MAX_KEY;index++){ TKBW2  
    if(hCallWnd[index]==NULL) Q' qz(G0  
     continue; =AIeYUh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M6o"|\  
    { $vK(Qm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [DzZ:8  
     bProcessed=TRUE; BL^\"Xh$|  
    } |qFCzK9tD/  
   } }5qpiS"V9  
  } $zUHka   
  else if((lParam&0xc000ffff)==1){ //有键按下 Yg kd1uI.  
   switch(wParam) $]t3pAI[H0  
   { oDBv5  
    case VK_MENU: +zf[Im%E  
     MaskBits|=ALTBIT; GLE/ 1  
     break; 7`_`V&3s  
    case VK_CONTROL: :[C"}m R1  
     MaskBits|=CTRLBIT; o!-kwtw`l  
     break; cA8A^Iv:0  
    case VK_SHIFT: 6A23H7  
     MaskBits|=SHIFTBIT; Cl>{vS N  
     break; JULns#tx}  
    default: //judge the key and send message {\62c;.  
     break; ZGZ1Q/WH  
   } o/~Rf1  
   for(int index=0;index<MAX_KEY;index++){ 3yw`%$d5  
    if(hCallWnd[index]==NULL) t#BQB<GI  
     continue; UHT2a9rG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O=E?m=FR"  
    { ,z0~VS:g8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'YTSakNJ}  
     bProcessed=TRUE; mx3p/p  
    } ZD;1{  
   } x@*!MC #  
  } ?)V?6"fFP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mo()l8  
   for(int index=0;index<MAX_KEY;index++){ /fDXO;tN  
    if(hCallWnd[index]==NULL) f~?4  
     continue; ')#!M\1,HQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xh`4s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nc/F@HCB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 V krjs0  
   } gHmy?+)  
  } &cHA xker  
 } F+ Q(^Nk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UrJrv x  
} dp DPSI  
/k O <o&  
  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: 0n-S%e5  
=Hf`yH\#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &\>.j|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RoYwZX~  
rMEM$1vPU  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 5|_El/G  
3K{G=WE$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3EO:Uk5<   
{ "p\5:<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) tx_h1[qi  
 { w6&p4Jw/H?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 C=,O'U(ep  
  SaveBmp(); Or<OmxJg  
  return FALSE; oj%(@6L  
 } (F=q/lK$  
 …… //其它处理及默认处理 K$kI%eGZA  
} :xy4JRcF  
`*-rz<G  
mGP&NOR0^y  
  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。 >\4"k4d}  
Bh ,GQHJ  
  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。 X-k$6}D  
Mp,aQ0bNS  
  二、编程步骤 ag{cm'.  
caD)'FSES  
  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"; +Jw+rjnP  
$*q^7ME  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; S\<nCkE^  
UR<a7j"@2  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; AXT(D@sI=  
/w "h'u  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; o_R_  
ffI z>Of:  
  5、 添加代码,编译运行程序。 n}L Jt  
d8ck].m=  
三、程序代码 ni~1)"U.  
/ht-]Js$G  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *Eg[@5;QA  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _MxKfah'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4#Cm5xAt6  
#if _MSC_VER > 1000 JrNqS[c/  
#pragma once HIsB)W&%@  
#endif // _MSC_VER > 1000 oxZXY]$y  
#ifndef __AFXWIN_H__ XpIl-o&re  
#error include 'stdafx.h' before including this file for PCH x=YV*  
#endif Vqp 3'=No  
#include "resource.h" // main symbols O 4C}]E  
class CHookApp : public CWinApp n@_aTY  
{ [oD u3Qn  
 public: /7LAd_P6  
  CHookApp(); +[Bl@RHe^  
  // Overrides $iMbtA5a Q  
  // ClassWizard generated virtual function overrides EK2mJCC|  
  //{{AFX_VIRTUAL(CHookApp) Aq;WQyZ2  
 public: lcfX(~/m^  
  virtual BOOL InitInstance(); sg%Ptp  
  virtual int ExitInstance(); N:~CN1  
  //}}AFX_VIRTUAL ( 8Q*NZ  
  //{{AFX_MSG(CHookApp) `"h[Xb#A`b  
  // NOTE - the ClassWizard will add and remove member functions here. IutU ~%wv  
  // DO NOT EDIT what you see in these blocks of generated code ! /zg|I?$>Z4  
  //}}AFX_MSG L['g')g.  
  DECLARE_MESSAGE_MAP() V(wANvH  
}; 'dJ(x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hQ\W~3S55  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1w}D fI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T )!k J;vc  
BOOL InitHotkey();  LOi/+;>  
BOOL UnInit(); ,t@B]ll  
#endif cxz\1Vphd  
 RxO !h8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QE4TvnhK  
#include "stdafx.h" )QAS7w#k  
#include "hook.h" 6rBP,\m  
#include <windowsx.h> 1<F6{?,z  
#ifdef _DEBUG ypLt6(1j%  
#define new DEBUG_NEW ZW%;"5uVm)  
#undef THIS_FILE |"aop|  
static char THIS_FILE[] = __FILE__; BI6]{ZC"  
#endif "@(Sw>*o  
#define MAX_KEY 100 2g HRfTF  
#define CTRLBIT 0x04 -(JBgM"  
#define ALTBIT 0x02 g27)$0&0  
#define SHIFTBIT 0x01 Ci$?Hm9n  
#pragma data_seg("shareddata") bsv!z\}  
HHOOK hHook =NULL; a/TeBx#yG  
UINT nHookCount =0; 8iUYZF  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,w%hD*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2bAH)=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey W *~[KdgC  
static int KeyCount =0; :wY(</H  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift v{;^>"5o  
#pragma data_seg() P2 fiK  
HINSTANCE hins; -9; XNp  
void VerifyWindow(); bBY7^k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) se*!OiOt  
//{{AFX_MSG_MAP(CHookApp) 2Dw}o;1'  
// NOTE - the ClassWizard will add and remove mapping macros here. X}ft7;Jpy  
// DO NOT EDIT what you see in these blocks of generated code! (w1$m8`=  
//}}AFX_MSG_MAP 1 Sz v4  
END_MESSAGE_MAP() &f-x+y  
vVf%wei^#  
CHookApp::CHookApp() ZZrv l4h  
{ ~S~4pK  
 // TODO: add construction code here, h ;1D T  
 // Place all significant initialization in InitInstance S!8q>d,%L  
} !SdP<{[  
UO4z~  
CHookApp theApp; #n.XOet<\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ",pd 9  
{ M a^}7D /  
 BOOL bProcessed=FALSE; 5%]O'h  
 if(HC_ACTION==nCode) ^\g?uH6k U  
 { |*B9{/;4  
  if((lParam&0xc0000000)==0xc0000000){// Key up WSqo\]  
   switch(wParam) .f9&.H#  
   { j5!pS xOC  
    case VK_MENU: `%_(_%K  
     MaskBits&=~ALTBIT; h~5gHx/ a  
     break; r1[#_A`Yn  
    case VK_CONTROL: Odr<fvV,>  
     MaskBits&=~CTRLBIT; 8+Abw)]s  
     break; gB])@O%/  
    case VK_SHIFT: qo7jrY5G  
     MaskBits&=~SHIFTBIT; .TO#\!KBv  
     break; -cgMf\YF  
    default: //judge the key and send message nG~^-c+  
     break; n K6(0?/  
   } jIjW +D`  
   for(int index=0;index<MAX_KEY;index++){ +[7 DRT:  
    if(hCallWnd[index]==NULL) D-Q54"^3  
     continue; G2w0r,[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zp+orc7  
    { .5!Q(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `<(o;*&Gd  
     bProcessed=TRUE; ."j=s#OC(  
    } ]SUW"5L-  
   } AZva  
  } ^K0oJg.E  
  else if((lParam&0xc000ffff)==1){ //Key down OjsMT]  
   switch(wParam) _-z;  
   { o'=i$Eb  
    case VK_MENU: C ett*jm_  
     MaskBits|=ALTBIT; og`g]Z<I  
     break; J<MuWgx&  
    case VK_CONTROL: KJW^pAj$B  
     MaskBits|=CTRLBIT; jdd3[  
     break; $|VD+[jSV  
    case VK_SHIFT: '5\?l:z  
     MaskBits|=SHIFTBIT; =\g K<Xh  
     break; ^C~t)U  
    default: //judge the key and send message mw*KLMo42  
     break; ?i$MinK  
   } JfzfxfM  
   for(int index=0;index<MAX_KEY;index++) $KPf[JvQ  
   { +r$VrNVs  
    if(hCallWnd[index]==NULL) VLC=>w\,  
     continue; 22R ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #YK=e&da  
    { Rts.jm>[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p~z\&&0U0  
     bProcessed=TRUE; naM=oSB(  
    } D<lVWP  
   } :oytJhxU  
  } &:#"APX  
  if(!bProcessed){ )JOo|pr-K  
   for(int index=0;index<MAX_KEY;index++){ WD|pG;Gq  
    if(hCallWnd[index]==NULL) *~^M_wej  
     continue; wp<f{^ et  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _ uZVlu@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {cmV{ 4Yx  
   } \Wb3JQ)  
  } `gdk,L]  
 } v,c;dlg_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Vkl]&mYRz  
} n!L}4Nmp  
/ gP"X1.  
BOOL InitHotkey() UVD*GsBk  
{ yH(%*-S  
 if(hHook!=NULL){ KNSMx<GP  
  nHookCount++; $u, ~183  
  return TRUE; < ;fI*km  
 } 8r.3t\o)X  
 else Yq%r\[%*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ur(<  ]  
  if(hHook!=NULL) RpzW-  
   nHookCount++; 6A-nhvDP  
  return (hHook!=NULL); e|4U2\&3y  
} i}~U/.P   
BOOL UnInit() M<xF4L3]  
{ L DdgI  
 if(nHookCount>1){ ?zK\!r{  
  nHookCount--; Z@bKYfGM  
  return TRUE; `86})xz{  
 } A[H"(E#k  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @VnK/5opS  
 if(unhooked==TRUE){ rhC x&L  
  nHookCount=0; z`!f'I--!  
  hHook=NULL; 0>yu Bgh  
 } w%~Mg3|  
 return unhooked; -NUA  
} wcL|{rUXba  
DYTC2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bl[2VM7P  
{ _@O.EksY3r  
 BOOL bAdded=FALSE; 90">l^HX=  
 for(int index=0;index<MAX_KEY;index++){ \'+P5,  
  if(hCallWnd[index]==0){ uM2 .?>`X  
   hCallWnd[index]=hWnd; Q$x 3uH\@  
   HotKey[index]=cKey; Nx<fj=VJ  
   HotKeyMask[index]=cMask; 43Ua@KNi  
   bAdded=TRUE; PDpDkcy|QM  
   KeyCount++; _.5AB E  
   break;  dQI6.$?  
  } ^@;P-0Sy  
 } R?8/qGSVqJ  
 return bAdded; nQd~i0`vB  
} 3e1^r_YI  
T *rz#O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S{UEV7d:n0  
{ M+WN\.2pX  
 BOOL bRemoved=FALSE; U\6Ee-1#_  
 for(int index=0;index<MAX_KEY;index++){ 8YO` TgW  
  if(hCallWnd[index]==hWnd){ `}#n#C)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v(^;%  
    hCallWnd[index]=NULL; &W N R{  
    HotKey[index]=0; iM~qSRb#mJ  
    HotKeyMask[index]=0; #yOn /  
    bRemoved=TRUE; f&? 8fB8{  
    KeyCount--; Gy!bPVe  
    break; h/7_IuD  
   } a4eE/1  
  } ) -@Dh6F  
 } #g]eDU-[  
 return bRemoved; hv)d  
} wcW}Sv[r  
] jycg@=B  
void VerifyWindow() vzZ"TSP  
{ 6IKi*}  
 for(int i=0;i<MAX_KEY;i++){ I~25}(IDZ"  
  if(hCallWnd!=NULL){ ]GXE2A_i;  
   if(!IsWindow(hCallWnd)){ PGA `R  
    hCallWnd=NULL; +g% Ah  
    HotKey=0; #fxdZm,  
    HotKeyMask=0; i"#zb&~nF  
    KeyCount--; ]%[.>mR  
   } JjQ9AJ?-V  
  } (w?W=guHu  
 } zI'c'X1,  
} D "X`qF6U7  
[[KIuW~ot  
BOOL CHookApp::InitInstance() |L~RC  
{ =8E GB\P  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .p-T >  
 hins=AfxGetInstanceHandle(); [W=6NAd  
 InitHotkey(); >/y+;<MZ  
 return CWinApp::InitInstance(); ig4mj47wJ  
} /086qB|  
yVH>Q-{  
int CHookApp::ExitInstance() Zmy:Etqi  
{ L!^^3vn  
 VerifyWindow(); "\"sM{x  
 UnInit(); 3'[ g2JR  
 return CWinApp::ExitInstance(); .%_=(C< E  
} rG{,8*  
pR3K~bx^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;%4N@Z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) DaqpveKa  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F,JqHa9  
#if _MSC_VER > 1000 t8t+wi!  
#pragma once "^5%g%  
#endif // _MSC_VER > 1000 idNg&'   
Ui }%T]  
class CCaptureDlg : public CDialog YBQ{/"v%|  
{ ?$%2\"wX~7  
 // Construction ~s>Ud<l%r  
 public: _+. )8   
  BOOL bTray; AmBLZ<f;  
  BOOL bRegistered; "K#zY~>L  
  BOOL RegisterHotkey(); F"t.ND  
  UCHAR cKey; k4YW;6<C+  
  UCHAR cMask; -qJO6OM  
  void DeleteIcon(); Il$Jj-)  
  void AddIcon(); 8Oo16LPD  
  UINT nCount; nH|7XY9"  
  void SaveBmp(); %Q|Hvjk=E  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor a<&GsDw  
  // Dialog Data "SU O2-Gj  
  //{{AFX_DATA(CCaptureDlg) W_h!Puj_  
  enum { IDD = IDD_CAPTURE_DIALOG }; VHx:3G  
  CComboBox m_Key; yQqu Gu  
  BOOL m_bControl; >?GCH(eW%  
  BOOL m_bAlt; L+NrU+:=C  
  BOOL m_bShift; m]'P3^<{P  
  CString m_Path; n!%'%%o2v  
  CString m_Number; X!f` !tZ:{  
  //}}AFX_DATA 9oxn-)6JC  
  // ClassWizard generated virtual function overrides qp2&Z8S\D  
  //{{AFX_VIRTUAL(CCaptureDlg) Vnnl~|Xx  
 public: CF/8d6}Vf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); z460a[Wl  
 protected: Mtq^6`JJ'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2Z*^)ZQB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); a VIh|v  
  //}}AFX_VIRTUAL S"Drg m.  
  // Implementation <CGJ:% AY  
 protected: N3?hu}  
  HICON m_hIcon; #~6au6LMC  
  // Generated message map functions 5U<;6s  
  //{{AFX_MSG(CCaptureDlg) \mDBOC0eK  
  virtual BOOL OnInitDialog(); }vt>}%%  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~3qt<"  
  afx_msg void OnPaint(); br4 %(w(d  
  afx_msg HCURSOR OnQueryDragIcon(); T7j,%ay9  
  virtual void OnCancel(); |]j2T 8_=  
  afx_msg void OnAbout(); CG[04y  
  afx_msg void OnBrowse(); T&s}~S=m  
  afx_msg void OnChange(); _#T bO fu  
 //}}AFX_MSG d2Ox:| <)  
 DECLARE_MESSAGE_MAP() Q ;$NDYV1  
}; obSLy Ed  
#endif &v<Am%!N  
/@+[D{_Fw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file tz/NR/[  
#include "stdafx.h" /%i:(Ny  
#include "Capture.h" #iP5@:!Wm~  
#include "CaptureDlg.h" ')1p  
#include <windowsx.h> yo_;j@BGR  
#pragma comment(lib,"hook.lib")  4,?ZNyl  
#ifdef _DEBUG 3nX={72<b  
#define new DEBUG_NEW -)p| i~j^A  
#undef THIS_FILE ]rc =oP;  
static char THIS_FILE[] = __FILE__; Hjc *W Tu  
#endif cUc:^wvLS  
#define IDM_SHELL WM_USER+1 QZamf lk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .?*TU~S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s?_H<u  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z,5B(Xj  
class CAboutDlg : public CDialog Jn)DZv8?  
{ 6G]hs gro  
 public: Kp%:\s,lO  
  CAboutDlg(); Pze{5!  
  // Dialog Data `E-cf7%  
  //{{AFX_DATA(CAboutDlg) R6-Z]H u  
  enum { IDD = IDD_ABOUTBOX }; FmC [u  
  //}}AFX_DATA \Ea(f**2B  
  // ClassWizard generated virtual function overrides T/ TMi&:?.  
  //{{AFX_VIRTUAL(CAboutDlg) _A,mY6 *  
 protected: {qL}:ha?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i=X B0-  
  //}}AFX_VIRTUAL ::2(pgH  
  // Implementation \wxLt}T-Q  
 protected: -9^A,vX  
  //{{AFX_MSG(CAboutDlg) @V qI+5TA  
  //}}AFX_MSG $gysy!2}.  
  DECLARE_MESSAGE_MAP() ]%Z7wF</  
}; pX]"^f1?O  
w~}.c:B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) CC.ri3+.  
{ j2Uu8.8d  
 //{{AFX_DATA_INIT(CAboutDlg) 41NVF_R6J  
 //}}AFX_DATA_INIT %mMPALN]{  
} w}r~Wk^dLI  
B),Z*lpC  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {x<yDDIv_  
{ 0:q R,NW^#  
 CDialog::DoDataExchange(pDX); xoyH5ZK@  
 //{{AFX_DATA_MAP(CAboutDlg) *{s 3.=P.  
 //}}AFX_DATA_MAP zE1=*zO`  
} ZA.i\ ;2  
>!%F$$  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2~RG\JWTA  
 //{{AFX_MSG_MAP(CAboutDlg) .Fm@OQr  
 // No message handlers !TeI Jm/l  
 //}}AFX_MSG_MAP R&9Q#n-  
END_MESSAGE_MAP() |}naI_Qudv  
!\/J|~XZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  Or,W2  
: CDialog(CCaptureDlg::IDD, pParent) p5JRG2zt  
{ w^8i!jCy  
 //{{AFX_DATA_INIT(CCaptureDlg) $W0O  
  m_bControl = FALSE; l&oc/$&|[  
  m_bAlt = FALSE; m+9~f_}  
  m_bShift = FALSE; Pj{Y  
  m_Path = _T("c:\\"); =uD^#AX  
  m_Number = _T("0 picture captured."); mk]8}+^.  
  nCount=0; > ,;<Bz|X  
  bRegistered=FALSE; ^~K[bFbW  
  bTray=FALSE; j-9Zzgr  
 //}}AFX_DATA_INIT %)p?&_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SCo;Ek  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (.N!(;G  
} EiCEB;*z|d  
K| '`w.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W+u-M>Cj6  
{ Y[Eq;a132  
 CDialog::DoDataExchange(pDX); +S ],){  
 //{{AFX_DATA_MAP(CCaptureDlg) >m# bj^F\  
  DDX_Control(pDX, IDC_KEY, m_Key); 9#b/D&pX5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ^b^}6L'Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dBEm7.nh  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !?5YXI,  
  DDX_Text(pDX, IDC_PATH, m_Path); MeW?z|x`'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); G*%:"qleT$  
 //}}AFX_DATA_MAP /[+%<5s  
} y{Vh?Z<E  
SmVL?wf  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) B<oBo&uA  
//{{AFX_MSG_MAP(CCaptureDlg) 'e:(61_  
 ON_WM_SYSCOMMAND() LZ<^b6Dxk  
 ON_WM_PAINT() ]oxi~TwY^  
 ON_WM_QUERYDRAGICON() 4rrR;V"}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]..7t|^b&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'mO>hD`V  
 ON_BN_CLICKED(ID_CHANGE, OnChange) =SV b k  
//}}AFX_MSG_MAP ,v_NrX=f?  
END_MESSAGE_MAP() )>I-j$%=2  
W.Z`kH *B  
BOOL CCaptureDlg::OnInitDialog() njckPpyb@  
{ ED^0t  
 CDialog::OnInitDialog(); aDda&RM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uS7kkzt-x  
 ASSERT(IDM_ABOUTBOX < 0xF000); _(F8}s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ubUVxYD?  
 if (pSysMenu != NULL) ]8CgHT[^7  
 { qrufnu5cC  
  CString strAboutMenu; VMH^jCFp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 20cEE>  
  if (!strAboutMenu.IsEmpty()) .JX9(#Uk  
  { D hD^w;f]  
   pSysMenu->AppendMenu(MF_SEPARATOR); do:IkjU~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?}"39n  
  } ' wni.E&  
 } h&2l0 |8k  
 SetIcon(m_hIcon, TRUE); // Set big icon fs0EbVDF  
 SetIcon(m_hIcon, FALSE); // Set small icon vX|5*T`(  
 m_Key.SetCurSel(0); \gR%PN  
 RegisterHotkey(); v"-K-AQjB  
 CMenu* pMenu=GetSystemMenu(FALSE); <h%I-e6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0t7vg#v|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z7p!YTA  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 8\Bb7*  
 return TRUE; // return TRUE unless you set the focus to a control K/M2L&C  
} A\<W x/  
I &;9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .?kq\.rQ  
{ OJ r~iUr  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Go(Td++HS  
 { ]i\;#pj}  
  CAboutDlg dlgAbout; n&3}F?   
  dlgAbout.DoModal(); z]R%'LGu  
 } Y`rli  
 else nt8& Mf  
 { w|c200Is}e  
  CDialog::OnSysCommand(nID, lParam); iF Zqoz  
 } Oi<yT"7  
} 5i+cjT2  
XIn,nCY;  
void CCaptureDlg::OnPaint() %Ni"*\  
{ 5GbC}y>  
 if (IsIconic()) xJ9aFpTC  
 { LkXho>y  
  CPaintDC dc(this); // device context for painting ;Vpp1mk|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  "3/&<0k  
  // Center icon in client rectangle wKKQAM6P1  
  int cxIcon = GetSystemMetrics(SM_CXICON); P1ak>T *#2  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5bBCI\&sam  
  CRect rect; wSi$.C2  
  GetClientRect(&rect); |Wr$5r  
  int x = (rect.Width() - cxIcon + 1) / 2; )+|Y;zC9  
  int y = (rect.Height() - cyIcon + 1) / 2; QD%!a{I  
  // Draw the icon q _Z+H4  
  dc.DrawIcon(x, y, m_hIcon); </2 aQn  
 } O L 9(~p  
 else ["[v  
 { )]kxLf#  
  CDialog::OnPaint(); Whe-()pG{  
 } 9g]%}+D  
} _@W1?;yD  
FLX n%/  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~LQzt@G4  
{ +lxjuEiae  
 return (HCURSOR) m_hIcon; *wx95?H0Z  
} ERia5HnoD,  
Zz"8  
void CCaptureDlg::OnCancel() EjMVlZC>  
{ m`}mbm^  
 if(bTray) 5Dzf[V^]`  
  DeleteIcon(); $ ^@fV=e  
  CDialog::OnCancel(); 3 &mpn,  
} <cU%yA710  
hZlHY9[t?  
void CCaptureDlg::OnAbout() B<i(Y1n[  
{ zK&1ti@wln  
 CAboutDlg dlg; 4:-x!lt  
 dlg.DoModal(); o (4gh1b%  
} /l_u $"  
-K3d u&j  
void CCaptureDlg::OnBrowse() "$pbK:  
{ u`D _  
 CString str; 4}s'xMT!  
 BROWSEINFO bi; OTl9MwW  
 char name[MAX_PATH]; .>z1BP:(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); YgdQC(ib  
 bi.hwndOwner=GetSafeHwnd(); "blq)qo)  
 bi.pszDisplayName=name; lV$CBS  
 bi.lpszTitle="Select folder"; )K$YL='kX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;dPaWS1D  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q-rG~O9-  
 if(idl==NULL) g9fYt&  
  return; U8J9 #+:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); lrj&60R`w  
 str.ReleaseBuffer(); @Pf9;7,TV  
 m_Path=str; {* P[dyu  
 if(str.GetAt(str.GetLength()-1)!='\\') (Ldvx_  
  m_Path+="\\"; 7F2 RH 8)  
 UpdateData(FALSE); ` Nf  
} I=:"Fqj'N  
dr c-5{M  
void CCaptureDlg::SaveBmp() TW!OE"B  
{ tGU~G&  
 CDC dc; 6 Ia HaV+P  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Np%Q-T\  
 CBitmap bm; K_~kL0=4  
 int Width=GetSystemMetrics(SM_CXSCREEN); a"X h  
 int Height=GetSystemMetrics(SM_CYSCREEN); r-go921  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6<T:B[a-  
 CDC tdc; Il Qk W<  
 tdc.CreateCompatibleDC(&dc); ;S \s&.u  
 CBitmap*pOld=tdc.SelectObject(&bm); /_})7I52  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0KTO )K  
 tdc.SelectObject(pOld); @_?2iN?4Z  
 BITMAP btm; ar#73f  
 bm.GetBitmap(&btm); <b .p/uA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; QkC*om'/!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v0VQ4>  
 BITMAPINFOHEADER bih; *hru);OJr  
 bih.biBitCount=btm.bmBitsPixel; g$^-WmX\m  
 bih.biClrImportant=0; ~TsRUT  
 bih.biClrUsed=0; /# ]eVD  
 bih.biCompression=0; "T{WOGU+  
 bih.biHeight=btm.bmHeight; AH:uG#  
 bih.biPlanes=1; e4 ,SR(O>  
 bih.biSize=sizeof(BITMAPINFOHEADER); f;Oh"Yt  
 bih.biSizeImage=size; "[!b5f3!I  
 bih.biWidth=btm.bmWidth; ' tY(&&  
 bih.biXPelsPerMeter=0; +<.o,3  
 bih.biYPelsPerMeter=0; EQ ee5}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qB (Pqv  
 static int filecount=0; #>("(euXMF  
 CString name; f}"eN/T  
 name.Format("pict%04d.bmp",filecount++); 3>^]r jFw  
 name=m_Path+name; 2|=hF9  
 BITMAPFILEHEADER bfh; PPH;'!>s"  
 bfh.bfReserved1=bfh.bfReserved2=0; ch :rAx  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &3Yj2 Fw  
 bfh.bfSize=54+size; 7P<f(@0h$E  
 bfh.bfOffBits=54; /'aqQ K<  
 CFile bf; (Hj[9[=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2.I|8d[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }oA>0Nw$K  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )WbWp4  
  bf.WriteHuge(lpData,size); C1e@{>  
  bf.Close(); U 7.kYu  
  nCount++; r dSL  
 } Y(bB7tR  
 GlobalFreePtr(lpData); r'j88)^  
 if(nCount==1) 2H}y1bkW  
  m_Number.Format("%d picture captured.",nCount); nAWb9Yk  
 else n0T|U  
  m_Number.Format("%d pictures captured.",nCount); S4`X^a}pY  
  UpdateData(FALSE); @B (oq1i@  
} 8T9 s:/%  
.Y{x!Q"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @, GL&$Y:W  
{ \Q(a`6U  
 if(pMsg -> message == WM_KEYDOWN) Lv]%P.=[G  
 { lYCvYe  
  if(pMsg -> wParam == VK_ESCAPE) 7)V"E-6h  
   return TRUE; 'I&0$<  
  if(pMsg -> wParam == VK_RETURN) 4pf@.ra,  
   return TRUE; ,AweHUEn  
 } d}zh.O5P!  
 return CDialog::PreTranslateMessage(pMsg); ^n0;Q$\  
} \.}T_,I  
XQ9W y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V%s7*`U  
{ )f|`mM4DW!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j!>P7 8  
  SaveBmp(); OyVP_Yx,V  
  return FALSE; Lo1ySLo$G  
} ;W|NG3_y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 05R"/r*  
 CMenu pop; myR{ }G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H" `'d  
 CMenu*pMenu=pop.GetSubMenu(0); 'k[qx}  
 pMenu->SetDefaultItem(ID_EXITICON); 38p"lT  
 CPoint pt; G9^`cTvv'8  
 GetCursorPos(&pt); Z! O4hA4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~q}L13^k  
 if(id==ID_EXITICON) G |KA!q  
  DeleteIcon(); !i~(h&z  
 else if(id==ID_EXIT) *lvADW5e  
  OnCancel(); x C&IR*  
 return FALSE; BYXc 'K  
} :vb5J33U  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wDh]vH[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B6 (\1  
 AddIcon(); 9GH5  
 return res; 8#yu.\N.xt  
} yiQ?p:DM  
d<7b<f"~  
void CCaptureDlg::AddIcon() yy8-t2V  
{ P.XT1)qo*  
 NOTIFYICONDATA data; T,/rC{  
 data.cbSize=sizeof(NOTIFYICONDATA); f(w>(1&/B  
 CString tip; rZ `1G  
 tip.LoadString(IDS_ICONTIP); ih".y3  
 data.hIcon=GetIcon(0); ;,[0bmL  
 data.hWnd=GetSafeHwnd(); v#qdq!64  
 strcpy(data.szTip,tip); 7-K8u  
 data.uCallbackMessage=IDM_SHELL; mG\QF0h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'Gl~P><e  
 data.uID=98; z1Bi#/i  
 Shell_NotifyIcon(NIM_ADD,&data); `^SRg_rH=`  
 ShowWindow(SW_HIDE); P-Y_$Nv0g  
 bTray=TRUE;  C7ivA h  
} ]5"k%v|  
?d-w#<AiV  
void CCaptureDlg::DeleteIcon() BA: x*(%~  
{ 'c7nh{F  
 NOTIFYICONDATA data; x^[,0?y2  
 data.cbSize=sizeof(NOTIFYICONDATA); 6]b"n'G  
 data.hWnd=GetSafeHwnd(); aNEah  
 data.uID=98; z qq  
 Shell_NotifyIcon(NIM_DELETE,&data); FSA%,b; U  
 ShowWindow(SW_SHOW); \uOM,98xS  
 SetForegroundWindow(); '_G\_h}5  
 ShowWindow(SW_SHOWNORMAL); q k^FyZ<  
 bTray=FALSE; I;t@wbY,  
} tJ6@Ot  
'-%1ILK$3r  
void CCaptureDlg::OnChange() .@,t}:lD  
{ d#0:U Y%~  
 RegisterHotkey(); z9ADF(J?0'  
} dR]-R/1|  
kP%hgZ  
BOOL CCaptureDlg::RegisterHotkey() UA8hYWRP  
{ losqc *|  
 UpdateData(); (p%|F`  
 UCHAR mask=0; pz /[ ${X  
 UCHAR key=0; 7?=^0?a  
 if(m_bControl) xc#t8`  
  mask|=4; v;<gCzqQh  
 if(m_bAlt) {oqbV#/&  
  mask|=2; r& a[ ?  
 if(m_bShift) G(a5@9F  
  mask|=1; RhE~Rwbx  
  key=Key_Table[m_Key.GetCurSel()]; tr<f ii 3<  
 if(bRegistered){ `HRL .uX  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e%JIqKS  
  bRegistered=FALSE; eT".psRiC  
 } ~JXz  
 cMask=mask; 2xLtJR4L  
 cKey=key; 1X2j%q I&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U9:)qvMXe  
 return bRegistered; 4[$:KGh3  
} _U^[h!  
~9+01UU^  
  四、小结 d^}p#7mB\  
H]/ ~ #a  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八