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
  • 7057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: v2dCkn /  
  |i"A!r W  
  一、实现方法 x-0IxWD%  
O/wl";-  
  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: aXyu%<@k  
q!k  F  
#pragma data_seg("shareddata") z[DUktZl  
HHOOK hHook =NULL; //钩子句柄 [IVT0 i  
UINT nHookCount =0; //挂接的程序数目 O~g _rcG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U A T46  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 \^kyC1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0Ng6Xg(QHc  
static int KeyCount =0; Bo?uwi  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 CJ_X:Frj)  
#pragma data_seg() OE-$P  
X6 ~y+ R  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ~ X8U@f  
Y;je::"  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: R0;c'W)  
a}a_&rf~Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR p#O#M N*  
cKey,UCHAR cMask) zh'TR$+\hO  
{   /I  
 BOOL bAdded=FALSE; Qw^nN(K!>  
 for(int index=0;index<MAX_KEY;index++){ pv TV*  
  if(hCallWnd[index]==0){ #lQbMuR  
   hCallWnd[index]=hWnd; xTX\% s|  
   HotKey[index]=cKey; * eL%[B  
   HotKeyMask[index]=cMask; $"T1W=;j9  
   bAdded=TRUE; p2PD';"  
   KeyCount++; [UquI "  
   break; j3VM !/  
  } Q;{yIa$ $  
 } !o*BRR*  
 return bAdded; 6)P~3 C'  
} fcb:LPk;  
//删除热键 U KF/v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qt}vM*0}V  
{ } 1w[G;$  
 BOOL bRemoved=FALSE; A6}M F  
 for(int index=0;index<MAX_KEY;index++){ *Xt#04_  
  if(hCallWnd[index]==hWnd){  r_]wa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \~Zj](#  
    hCallWnd[index]=NULL; ;C-5R U V  
    HotKey[index]=0; bslv_OxJ  
    HotKeyMask[index]=0; jHBn^Nly  
    bRemoved=TRUE; mwCNfwb:  
    KeyCount--; %96JH YcX  
    break; {$>*~.Wu  
   } OekcU% C  
  } Kwfrh?  
 } WUAjb,eo  
 return bRemoved; knpb$eX4  
} X#5dd.RR  
_< 69d  
"*#$$e53A  
  DLL中的钩子函数如下: ppVjFCv0<  
BgD;"GD*W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h|dVVCsN  
{ jgYUS@}  
 BOOL bProcessed=FALSE; p*W4^2(d  
 if(HC_ACTION==nCode) 5JDqSz{  
 { =ALy.^J=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JrseU6N  
   switch(wParam) |]DZc/  
   {  M9]O!{ sq  
    case VK_MENU: g GN[AqR  
     MaskBits&=~ALTBIT; WW@/q`h  
     break; jfl7L"2  
    case VK_CONTROL: XcaY'k#  
     MaskBits&=~CTRLBIT; ?AyG!F  
     break; J'Yj_  
    case VK_SHIFT: tQ'E"u1  
     MaskBits&=~SHIFTBIT; G=!Y~qg  
     break; q NU\XO`H  
    default: //judge the key and send message wsP3hE' ]  
     break; BkA>':bUr  
   } Uk-^n~y  
   for(int index=0;index<MAX_KEY;index++){ jN 5Hku[?  
    if(hCallWnd[index]==NULL) tHXt*tzq  
     continue; dI-=0v-|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w48T?  
    { q>r9ooN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B c*Rn3i@  
     bProcessed=TRUE; j)C%zzBu(  
    } <|Bh;;  
   } O9A.WSJ >}  
  } d4[M{LSl  
  else if((lParam&0xc000ffff)==1){ //有键按下 0Apdhwk~  
   switch(wParam) @pYAqX2  
   { +uKlg#wqc  
    case VK_MENU: :74^?  
     MaskBits|=ALTBIT; ( E&}SI~  
     break; '\l(.N  
    case VK_CONTROL: k  5xzC&  
     MaskBits|=CTRLBIT; 6"[`"~9'V  
     break; WUGPi'x  
    case VK_SHIFT: 0fXdE ;M3  
     MaskBits|=SHIFTBIT; kE,~NG9P  
     break; qUx!-DMY  
    default: //judge the key and send message ep3_G\m  
     break; N|z-s  
   } joAR;J  
   for(int index=0;index<MAX_KEY;index++){ wz9V)_V*  
    if(hCallWnd[index]==NULL) sJ7r9 O`x  
     continue; YQ 4;X8I`r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xRP#}i:m  
    { /t%IU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T WEmW&Q  
     bProcessed=TRUE; 5ts8o&|   
    } XkCbdb  
   } P00d#6hPJ  
  } +J]3)8 y+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7zVaj"N(  
   for(int index=0;index<MAX_KEY;index++){ . CLiv  
    if(hCallWnd[index]==NULL) C:_!zY'z  
     continue; %xyt4}-)m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) aoco'BR F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oA"t`,3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 st|$Fu  
   } u\ytiGO*  
  } _|wgw^.LJ]  
 } 6t *pV [  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -/B}XN W  
} E%3WJ%A  
lK9us  
  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: $[VKM|Zjw  
><TuL7+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c|:H/Y2n|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MH?|>6  
PD$ay^Y  
  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: :'f#0ox  
aa.EtKl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S$%T0~PR~  
{ hp%|n:.G  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4M6o+WV  
 { dU3UCD+2y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 XtNe) Ry  
  SaveBmp(); vXR-#MS`}  
  return FALSE; oS/<)>\Gv  
 } VZ}^1e  
 …… //其它处理及默认处理 T#|Qexz6 @  
} 8QE0J$d5  
sn+i[  
{uL<$;#i  
  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。 :7e2O!zH_  
 ;B^G<  
  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。 7cK#fh"hvg  
{Rc/Ten  
  二、编程步骤 &%>l9~F'~  
37v!:xF!  
  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"; z=N'evx~  
AVOzx00U  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Ii?<Lz  
(%oZgvM  
  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; ,`^B!U3m   
f:B+R  
  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; .*r ?zDV  
7F>5<Gv:-  
  5、 添加代码,编译运行程序。 }C}~)qaZv+  
xA`Q4"[I  
三、程序代码 (NFq/w%  
q<@f3[A  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6U @3 xU`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zKx?cEpE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ kmi[u8iXD_  
#if _MSC_VER > 1000 (VO) Q  
#pragma once w_ kHy_)  
#endif // _MSC_VER > 1000 IwZn%>1N  
#ifndef __AFXWIN_H__ {e/12q  
#error include 'stdafx.h' before including this file for PCH n (C*LK  
#endif ]-bA{@tP.  
#include "resource.h" // main symbols .LIEZ^@  
class CHookApp : public CWinApp 0 oEw1!cY  
{ Agl5[{]E  
 public: (WVN*OR?  
  CHookApp(); ]\v'1m"  
  // Overrides TF} <,aR  
  // ClassWizard generated virtual function overrides rG:IS=  
  //{{AFX_VIRTUAL(CHookApp) *%:p01&+  
 public: z. VuY3  
  virtual BOOL InitInstance(); YKJk)%;+w  
  virtual int ExitInstance(); <dV|N$WV  
  //}}AFX_VIRTUAL d0Py[37V  
  //{{AFX_MSG(CHookApp) 2L[/.|  
  // NOTE - the ClassWizard will add and remove member functions here. e=o<yf9>Q  
  // DO NOT EDIT what you see in these blocks of generated code ! \wCj$- ;Jt  
  //}}AFX_MSG >5% o9$|z  
  DECLARE_MESSAGE_MAP() e-ljwCD  
}; ua/A &XQx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ecA:y!N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g:dw%h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mv/'H^"[_  
BOOL InitHotkey(); `4'v)!?  
BOOL UnInit(); rqxoqcZ  
#endif mEa\0oPGB  
k_r12Bu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :2^%^3+V  
#include "stdafx.h" KqP! ={>"  
#include "hook.h" SuB;Nb7r`  
#include <windowsx.h> JX7_/P  
#ifdef _DEBUG |qH-^b.F  
#define new DEBUG_NEW 'VS!<  
#undef THIS_FILE W#P)v{K  
static char THIS_FILE[] = __FILE__; =<YG0K  
#endif o|>2X[T  
#define MAX_KEY 100 94=Wy-  
#define CTRLBIT 0x04 <ap%+(!I  
#define ALTBIT 0x02 "A~\$  
#define SHIFTBIT 0x01 awB1ryrOF  
#pragma data_seg("shareddata") 4'Z=T\:  
HHOOK hHook =NULL; DxdiXf[j  
UINT nHookCount =0; j5Vyo>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :7K cD\fCj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %`F6>J  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ()6(eRGJ  
static int KeyCount =0; {CG%$rh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift O]DZb+O"  
#pragma data_seg() #Q.A)5_  
HINSTANCE hins; "EQ`Q=8  
void VerifyWindow(); cgNK67"(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) v(W$\XH  
//{{AFX_MSG_MAP(CHookApp) s]#D;i8  
// NOTE - the ClassWizard will add and remove mapping macros here. hk3}}jc  
// DO NOT EDIT what you see in these blocks of generated code! 3BAls+<p o  
//}}AFX_MSG_MAP T6=,A }t-  
END_MESSAGE_MAP() 6{B$_Usg  
|a%&7-;   
CHookApp::CHookApp() \hai  
{ {f((x1{HZx  
 // TODO: add construction code here, gtHWd;1&f  
 // Place all significant initialization in InitInstance v#q7hw=  
} 4:.yE|@h[  
kO{A]LnAH  
CHookApp theApp; U$Z)v1&{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mHrt)0\_  
{ KhIg  
 BOOL bProcessed=FALSE; L9M0vkgri  
 if(HC_ACTION==nCode) ;{[&&qMwU  
 { wHq*)7#h#  
  if((lParam&0xc0000000)==0xc0000000){// Key up >B<jR$`6@  
   switch(wParam) L:nZ_O;  
   { pUutI|mt/  
    case VK_MENU: g VX  
     MaskBits&=~ALTBIT; bCHJLtDQ  
     break; -`sK?*[{J  
    case VK_CONTROL: % 3d59O  
     MaskBits&=~CTRLBIT; xa5^h]o   
     break; sgu#`@o  
    case VK_SHIFT: HJ?p,V q5_  
     MaskBits&=~SHIFTBIT; 9gVu:o 1/  
     break; v^1_'P AXu  
    default: //judge the key and send message k%YvJXL  
     break; ShbW[*5  
   } `qnSq(tNq  
   for(int index=0;index<MAX_KEY;index++){ Clr~:2g\  
    if(hCallWnd[index]==NULL) ?9'Ukw` g  
     continue; Xb6X'rY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =Y Je\745  
    { h}r.(MVt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U2 m86@E  
     bProcessed=TRUE; LfOXgn\  
    } B*!{LjXV  
   } ;)].Dj9  
  }  G`8i{3:  
  else if((lParam&0xc000ffff)==1){ //Key down m%hI@'  
   switch(wParam) nb::,  
   { ]awu7}C9Z  
    case VK_MENU:  =z`#n}v  
     MaskBits|=ALTBIT; M:K5r7Q!yv  
     break; mj:X'BVA  
    case VK_CONTROL: @px2/x  
     MaskBits|=CTRLBIT; K,(37Id'  
     break; Kq& b1x  
    case VK_SHIFT: 1(t{)Z<  
     MaskBits|=SHIFTBIT;  -i*{8t  
     break; RG[b+Qjn  
    default: //judge the key and send message =kFZ2/P2t(  
     break; u}Kc>/AF  
   }  #~QkS_  
   for(int index=0;index<MAX_KEY;index++) xc{$=>'G  
   { E>>@X^ =  
    if(hCallWnd[index]==NULL) LgFF+z  
     continue; qM%l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $fZVh%  
    { w6FtDl$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P(AcDG6K  
     bProcessed=TRUE; v d A 3  
    } U?BuV  
   } =E$Hq4I  
  } _voU^-  
  if(!bProcessed){ 1?+%*uoPX  
   for(int index=0;index<MAX_KEY;index++){ 7HfA{.|m  
    if(hCallWnd[index]==NULL) L *",4!  
     continue; bit@Kv1<C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Tk1U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 'PiQ|Nnb|  
   } bDK%vx!_  
  } 4'EC(NR7N  
 } <E/"v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wP:ab  
} ,F^Rz.  
'KL!)}B$h  
BOOL InitHotkey() vu7F>{D  
{ .$&_fUY  
 if(hHook!=NULL){ )/uu~9SFd  
  nHookCount++; o}QtKf)W  
  return TRUE; U4PnQ K,  
 } -hv<8bC~4  
 else sUl/9VKl  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3jx5Lou)&  
  if(hHook!=NULL) Z'/sZ3Q}  
   nHookCount++; RC{|:@]8  
  return (hHook!=NULL); y*K]z  
} .zDm{_'  
BOOL UnInit() |Iq#Q3w  
{  3"B$M  
 if(nHookCount>1){ ]CL t Km  
  nHookCount--; &4]~s:F  
  return TRUE; #i6ZY^+ee  
 } Iq/V[v  
 BOOL unhooked = UnhookWindowsHookEx(hHook); M{)7C,'  
 if(unhooked==TRUE){ AE?G+:B  
  nHookCount=0; ?-.Qv1hs6p  
  hHook=NULL; bSbUf%LKt  
 } a[).'$S}'  
 return unhooked; aJ;6!WFW  
} 1uz7E  
EGD&/%aC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tZ4Zj`x|^  
{ Wbra*LNU  
 BOOL bAdded=FALSE; bIs@CDB  
 for(int index=0;index<MAX_KEY;index++){ y*6-?@  
  if(hCallWnd[index]==0){ s}m.r5  
   hCallWnd[index]=hWnd; 1 UyQ``v/  
   HotKey[index]=cKey; QVEGd"WvvO  
   HotKeyMask[index]=cMask; (}^Qo^Vr  
   bAdded=TRUE; @-d0 ~.S  
   KeyCount++; )$Tcip`  
   break; XHX$Ur9  
  } y&F0IJ|`@M  
 } (bT3 r_  
 return bAdded; iRwlK5(&  
} F@C^nX9  
A]x'!qa@=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4|yZA*Q^  
{ @20~R/vh  
 BOOL bRemoved=FALSE; &i/QFO7y}  
 for(int index=0;index<MAX_KEY;index++){ m`3Mev  
  if(hCallWnd[index]==hWnd){ dF (m!P/R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Lc0yLm  
    hCallWnd[index]=NULL; <Oyxzs  
    HotKey[index]=0; ?A]@$  
    HotKeyMask[index]=0; >R&=mo~  
    bRemoved=TRUE; N7}Y\1-8  
    KeyCount--; Z3jtq-y  
    break; 3B+ F'k&#  
   } Tw)"#Y!T  
  } BkO)hze  
 } C{"uz_Gh  
 return bRemoved; ?:8wDV  
} "M`ehgCBr  
0SJ7QRo|K  
void VerifyWindow() VlLc[eVV  
{ !"dn!X  
 for(int i=0;i<MAX_KEY;i++){ 9[L@*7A`m  
  if(hCallWnd!=NULL){ ?M02|8-  
   if(!IsWindow(hCallWnd)){ UN,y /V  
    hCallWnd=NULL; fxR}a,a  
    HotKey=0; $ 2/T]  
    HotKeyMask=0; BAQ;.N4  
    KeyCount--; 4t Z. T9d  
   } Wd0$t    
  } #!h +K"wX  
 } [+j39d.Q  
} pbM"tr_A{  
P0/B!8x  
BOOL CHookApp::InitInstance() *, Mg  
{ Xy;!Q`h(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z T5p  
 hins=AfxGetInstanceHandle(); rwRb _eIj  
 InitHotkey(); ~582'-=+  
 return CWinApp::InitInstance(); pPezy:  
} I,0]> kx  
&R'%OFi  
int CHookApp::ExitInstance() TLkJZ4}?Q  
{ /p&)bL  
 VerifyWindow(); @|2}*_3\  
 UnInit(); (ex^=fv  
 return CWinApp::ExitInstance(); guD?~-Q  
} lQ}e"#<  
&dC #nw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @3 UVl^T  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =XT'D@q~W  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wu2AhMGmw  
#if _MSC_VER > 1000 h/CF^0m"!  
#pragma once $_.m<  
#endif // _MSC_VER > 1000 CCX!>k]  
bnWKfz5  
class CCaptureDlg : public CDialog e$wbYByW  
{ X> *o\   
 // Construction F! |?S:X  
 public: 4't@i1Ll(  
  BOOL bTray; yL&_>cV  
  BOOL bRegistered; u D.E>.B  
  BOOL RegisterHotkey(); MKuy?mri~  
  UCHAR cKey; GW(-'V/  
  UCHAR cMask; Q)l]TgvSe  
  void DeleteIcon(); ^z[-pTY  
  void AddIcon(); LX %8a^?;  
  UINT nCount; MI!JZI$z5  
  void SaveBmp(); FZ)Y<r8|s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7{vnhl(Z  
  // Dialog Data ~YuRi#CTD:  
  //{{AFX_DATA(CCaptureDlg) |sw&sfH[FD  
  enum { IDD = IDD_CAPTURE_DIALOG }; AR}M*sSh  
  CComboBox m_Key; `P`n qn  
  BOOL m_bControl; VH{SE7  
  BOOL m_bAlt; y %k`  
  BOOL m_bShift; '(/ZJ88JP  
  CString m_Path; ,H3C\.%w\  
  CString m_Number; .2xp.i{  
  //}}AFX_DATA !n`ogzOh  
  // ClassWizard generated virtual function overrides jH*+\:UP-  
  //{{AFX_VIRTUAL(CCaptureDlg) mX8A XWIa  
 public: vWJhSpC[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5T[9|zJs  
 protected: 328(W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !d1}IU-h  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D&WXa|EOK  
  //}}AFX_VIRTUAL Z?%j5G=4w  
  // Implementation nI4xK  
 protected: `9Qr kkG+  
  HICON m_hIcon; FjUp+5  
  // Generated message map functions 3I_"vk  
  //{{AFX_MSG(CCaptureDlg) g~L1e5C]z  
  virtual BOOL OnInitDialog(); zXB]Bf3TH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?80@+y]  
  afx_msg void OnPaint(); + R)x5  
  afx_msg HCURSOR OnQueryDragIcon(); }*n(RnCn  
  virtual void OnCancel(); lQ%]](a6  
  afx_msg void OnAbout(); 's{-1aW  
  afx_msg void OnBrowse(); h(;qnV'c  
  afx_msg void OnChange(); o8P 5C4y  
 //}}AFX_MSG hfY Ieb#91  
 DECLARE_MESSAGE_MAP() ? OBe!NDf  
}; Rk PY@>  
#endif s0Ii;7fA{  
&)vX7*j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (8s]2\/Ar  
#include "stdafx.h" r\Wp\LfY&{  
#include "Capture.h" j$*]'s&_hZ  
#include "CaptureDlg.h" -Uz xs5Zl  
#include <windowsx.h> +a&-'`7g  
#pragma comment(lib,"hook.lib") h^P>pI~  
#ifdef _DEBUG %PG::b  
#define new DEBUG_NEW y(:hN)  
#undef THIS_FILE sBIqee'T  
static char THIS_FILE[] = __FILE__; 0EM`,?i .Q  
#endif <69/ZI),Y{  
#define IDM_SHELL WM_USER+1 /KEPPp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Tk-PCra  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?lb1K'(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; do{#y*B/g!  
class CAboutDlg : public CDialog nzDS  
{ I~S`'()J  
 public: `n:IXD5'  
  CAboutDlg(); "b*.>QuZ  
  // Dialog Data $ 8w eh3p  
  //{{AFX_DATA(CAboutDlg) =JyYU*G4  
  enum { IDD = IDD_ABOUTBOX }; )2oWoZ vi9  
  //}}AFX_DATA   [E(DGt  
  // ClassWizard generated virtual function overrides -p>KFHj6  
  //{{AFX_VIRTUAL(CAboutDlg) ewgcpV|spn  
 protected: @2 dp5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u+s#Fee I  
  //}}AFX_VIRTUAL L6j 5pI  
  // Implementation $*%Ml+H-  
 protected: uL b- NxQ-  
  //{{AFX_MSG(CAboutDlg) dUn8Xqj1  
  //}}AFX_MSG o})4Jt1vj  
  DECLARE_MESSAGE_MAP() kq:,}fc;B  
}; 9B'l+nP  
i~z:Fe{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >"F~%D<.  
{ >qx~m>2|8]  
 //{{AFX_DATA_INIT(CAboutDlg) Ts;W,pgP  
 //}}AFX_DATA_INIT Wuosr3P  
} .c"UlOZ&w^  
2 < &-  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eEn_aX  
{ |Xd[%W)  
 CDialog::DoDataExchange(pDX); z$-/yT"M  
 //{{AFX_DATA_MAP(CAboutDlg) ,I=Cl mR  
 //}}AFX_DATA_MAP $X9Ban]  
} (k M\R|  
ckt^D/c2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CBSJY&:K  
 //{{AFX_MSG_MAP(CAboutDlg) !{s $V2_  
 // No message handlers ue/6DwUv  
 //}}AFX_MSG_MAP ,-c(D-&  
END_MESSAGE_MAP() OP2!lEs  
da!N0\.1T  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ru(Xeojv#  
: CDialog(CCaptureDlg::IDD, pParent) 6kT l(+  
{ xbo-~{  
 //{{AFX_DATA_INIT(CCaptureDlg) {<~XwJ.  
  m_bControl = FALSE; z.Y7u3K.8  
  m_bAlt = FALSE; HcHfwLin0  
  m_bShift = FALSE; %8$JL=c  
  m_Path = _T("c:\\"); ^i-%FY_i5}  
  m_Number = _T("0 picture captured."); p/lMv\`5  
  nCount=0; GQ|kcY=  
  bRegistered=FALSE; -5v c0"?E  
  bTray=FALSE; z}C#+VhQ`  
 //}}AFX_DATA_INIT 35RH|ci&  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R_vZh|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ) 0AE*S  
} 'QT(TF>  
=JO|m5z8>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4g\a$7 r  
{  e^&YQl  
 CDialog::DoDataExchange(pDX); um#;S;  
 //{{AFX_DATA_MAP(CCaptureDlg) 92Ar0j]  
  DDX_Control(pDX, IDC_KEY, m_Key); M|d[iaM,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 8)"KPr63M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); YhLtf(r  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); /gy;~eB01  
  DDX_Text(pDX, IDC_PATH, m_Path); (:+IS W  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h,140pW  
 //}}AFX_DATA_MAP 1V+1i)+  
} !kASEjFz|f  
.&@|)u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >w j7Y`  
//{{AFX_MSG_MAP(CCaptureDlg) jI;bVG  
 ON_WM_SYSCOMMAND() q3NS?t!  
 ON_WM_PAINT() tx5_e [  
 ON_WM_QUERYDRAGICON() 308w0eP  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) :1Fm~'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) B"KsYB79t  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *$# r%  
//}}AFX_MSG_MAP 9d[0i#`:q  
END_MESSAGE_MAP() Bf'jXM{-  
}%k"qW<Y  
BOOL CCaptureDlg::OnInitDialog() 82J0t}:U  
{ '12|:t&7  
 CDialog::OnInitDialog(); wmo'Pl  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  QV .A.DK  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3<mv9U(  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \|62E):i1  
 if (pSysMenu != NULL) 87<y_P@{  
 { mnmwO(.  
  CString strAboutMenu; oN `tZ;a  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K7f-g]Ibdn  
  if (!strAboutMenu.IsEmpty()) |!!E5osXq  
  { $d8A_CUU  
   pSysMenu->AppendMenu(MF_SEPARATOR); -'}iK6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G~B V^  
  } lf|^^2'*2<  
 } uhc0,V;S  
 SetIcon(m_hIcon, TRUE); // Set big icon G=nFs)z  
 SetIcon(m_hIcon, FALSE); // Set small icon :!}zdeRJ  
 m_Key.SetCurSel(0); lC_zSmT  
 RegisterHotkey(); Cg{$$&_(Hj  
 CMenu* pMenu=GetSystemMenu(FALSE); FJU)AjS~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^ w&TTo(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lZ)u4_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z,4=<;PF  
 return TRUE; // return TRUE unless you set the focus to a control t91CxZQ^s  
} f2yv7t T   
=]zPUzr,|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) --^D)n  
{ rXm!3E6JL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A\# ? rK  
 { <BU|?T6~  
  CAboutDlg dlgAbout; 'h= >ej*  
  dlgAbout.DoModal(); q!ZmF1sU  
 } ]#:xl}'LS  
 else w x,;  
 { 1|. 0]~0  
  CDialog::OnSysCommand(nID, lParam); r?X^*o9  
 } /Hx0=I  
} w`7l ;7[  
c=b\9!hr_E  
void CCaptureDlg::OnPaint() ^_=0.:QaW  
{ GUp51*#XR  
 if (IsIconic()) ;XtDz  
 { ]cA~%$c89s  
  CPaintDC dc(this); // device context for painting I9Sh~vTm=u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h{JVq72R  
  // Center icon in client rectangle ^|K*lI/  
  int cxIcon = GetSystemMetrics(SM_CXICON); S}< <jI-z  
  int cyIcon = GetSystemMetrics(SM_CYICON); #TSM#Uqe  
  CRect rect; a<o0B{7{BM  
  GetClientRect(&rect); y]CJOC)/K  
  int x = (rect.Width() - cxIcon + 1) / 2; M^[ jA](a  
  int y = (rect.Height() - cyIcon + 1) / 2; qt:->yiq+  
  // Draw the icon Wey\GQ`"8  
  dc.DrawIcon(x, y, m_hIcon); 'P Yl%2  
 } 3)-#yOr  
 else CTP%  
 { cq=R  
  CDialog::OnPaint(); }>1E,3A:%G  
 } eS.]@ E-T  
} Qdn:4yk  
-qEr-[z  
HCURSOR CCaptureDlg::OnQueryDragIcon() W ,U'hk%  
{ NkJ^ecn%)  
 return (HCURSOR) m_hIcon; y(S0 2v>l  
} Z0:BXtW  
2kgm)-z  
void CCaptureDlg::OnCancel() 0jzA\$oD  
{ ]e3nnS1*.  
 if(bTray) |kd^]! _  
  DeleteIcon(); <qy+@t  
  CDialog::OnCancel(); .iS]aJJ  
} xD#/@E1'Y  
.iYgRW=T  
void CCaptureDlg::OnAbout() @t^ 2/H ?O  
{ $-0u`=!  
 CAboutDlg dlg; %51pfuL  
 dlg.DoModal(); &p%ctg  
} 'oEmbk8Hg  
WE"'3u^k  
void CCaptureDlg::OnBrowse() ie ,{C  
{ 950b9Vn&  
 CString str; `^}9= Q'r  
 BROWSEINFO bi; tp]|/cx4  
 char name[MAX_PATH]; M@K[i*e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); a&[nVu+  
 bi.hwndOwner=GetSafeHwnd(); BY d3rI  
 bi.pszDisplayName=name; ={Hbx> p  
 bi.lpszTitle="Select folder"; yh)q96m-V=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; o&O!Ur  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `2oi~^.  
 if(idl==NULL) `WT7w']NT  
  return; i*tj@5MY-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); QM]^@2rK2  
 str.ReleaseBuffer(); ^v'Lu!\f  
 m_Path=str; {8MF!CG]  
 if(str.GetAt(str.GetLength()-1)!='\\') 9e5UTJ  
  m_Path+="\\"; PA/6l"-`3  
 UpdateData(FALSE); D5p22WY  
} UGMdWq  
o (zg_!P  
void CCaptureDlg::SaveBmp() r__M1 !3  
{ %Fv)$ :b  
 CDC dc; E*l"uV  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <*+ MBF  
 CBitmap bm; ivq4/Y] -X  
 int Width=GetSystemMetrics(SM_CXSCREEN); hMQ aT-v  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0>`69&;g|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); smU+:~  
 CDC tdc; z)B=<4r  
 tdc.CreateCompatibleDC(&dc); >gE_?%a[  
 CBitmap*pOld=tdc.SelectObject(&bm); R[c_L=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;gyE5n-{  
 tdc.SelectObject(pOld); 34=0.{qn  
 BITMAP btm; D4|_?O3 |m  
 bm.GetBitmap(&btm); WKf~K4BL>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -UVWs2W'$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;'p'8lts  
 BITMAPINFOHEADER bih; h]#)41y<  
 bih.biBitCount=btm.bmBitsPixel; * y B-N;I  
 bih.biClrImportant=0; K0\WN"ua;  
 bih.biClrUsed=0; y)}aySQK^  
 bih.biCompression=0; :]s] =q&]  
 bih.biHeight=btm.bmHeight; M@\'Y$)Y{  
 bih.biPlanes=1; 'w2;oO  
 bih.biSize=sizeof(BITMAPINFOHEADER); kWd'gftQ  
 bih.biSizeImage=size; (AYD @  
 bih.biWidth=btm.bmWidth; 4=Ey\Px  
 bih.biXPelsPerMeter=0; 1|VJND  
 bih.biYPelsPerMeter=0; NP8TF*5V  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /HRaX!|E#  
 static int filecount=0; x _K%  
 CString name; ?MH4<7?"  
 name.Format("pict%04d.bmp",filecount++); ) YFs  
 name=m_Path+name; 1%,Z&@^j  
 BITMAPFILEHEADER bfh; l_ c?q"X  
 bfh.bfReserved1=bfh.bfReserved2=0; lu_Gr=#O  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5o/rV.I  
 bfh.bfSize=54+size; Jy_'(hG  
 bfh.bfOffBits=54; m"R(_E5  
 CFile bf; g8Z14'Ke  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Eg*3**gTO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z-@}~#E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !UTJ) &  
  bf.WriteHuge(lpData,size); >$DqG$D  
  bf.Close(); `cpcO  
  nCount++; ZAZCvN@5  
 } +$t%L  
 GlobalFreePtr(lpData); eXK`%'  
 if(nCount==1) 9K|lU:,  
  m_Number.Format("%d picture captured.",nCount); }U9jsm  
 else N6;Z\\&0^q  
  m_Number.Format("%d pictures captured.",nCount); 7&4,',0VL  
  UpdateData(FALSE); L|LTsRIq  
} arZIe+KW  
<Xx\F56zp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I8?[@kg5b'  
{ @nu/0+8h{  
 if(pMsg -> message == WM_KEYDOWN) TXcKuo=  
 { l'QR2r7&.  
  if(pMsg -> wParam == VK_ESCAPE) TeJ `sJ  
   return TRUE;  iC]lO  
  if(pMsg -> wParam == VK_RETURN) UD{/L"GG  
   return TRUE; OX4D'  
 } )*ckJK  
 return CDialog::PreTranslateMessage(pMsg); =]e^8;e9  
} +pvJ?"J  
Br5Io=/wg  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !Yu-a!  
{ $4 Uy3C+6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !\1W*6U8;  
  SaveBmp(); Oq6n.:8g"  
  return FALSE; .h,xBT`}Ji  
} KU,w9<~i(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rzDJH:W{2  
 CMenu pop; 4&e@>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?LI9F7n  
 CMenu*pMenu=pop.GetSubMenu(0); p8l#=]\ ;  
 pMenu->SetDefaultItem(ID_EXITICON); L?x?+HPY.  
 CPoint pt; p;$9W+H0  
 GetCursorPos(&pt); : !3y>bP)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Nl`ry2"<  
 if(id==ID_EXITICON) C4]%pi  
  DeleteIcon(); 2< Bv=B  
 else if(id==ID_EXIT) @88i/ Z_  
  OnCancel(); vv/,Rgv  
 return FALSE; ^z^e*<{WEl  
} ,<b|@1\k  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); CDj Dhs  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S7{.liHf  
 AddIcon(); % VpBB  
 return res; nM-SDVFM  
} 8"mW!M  
D^55:\4(  
void CCaptureDlg::AddIcon() W"(`n4hi3  
{ pm~;:#z7  
 NOTIFYICONDATA data; N+qLxk  
 data.cbSize=sizeof(NOTIFYICONDATA); Aq%^>YAp  
 CString tip; @T1+b"TC  
 tip.LoadString(IDS_ICONTIP); Z&jb,eh2  
 data.hIcon=GetIcon(0); '-33iG  
 data.hWnd=GetSafeHwnd(); ?i2Wst  
 strcpy(data.szTip,tip); wg<|@z5  
 data.uCallbackMessage=IDM_SHELL; m,C,<I|'d  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E5G"QnxR>N  
 data.uID=98; vUe *  
 Shell_NotifyIcon(NIM_ADD,&data); FK# E7 K  
 ShowWindow(SW_HIDE); H~ n~5 sF"  
 bTray=TRUE; D1~x  
} %aBJ+V F  
:gscW& k  
void CCaptureDlg::DeleteIcon() KTjlWxD  
{ ,,%:vK+V  
 NOTIFYICONDATA data; VHr7GAmU  
 data.cbSize=sizeof(NOTIFYICONDATA); cuaNAJ  
 data.hWnd=GetSafeHwnd(); ,Bw)n,  
 data.uID=98; W#I:j: p  
 Shell_NotifyIcon(NIM_DELETE,&data); S?\hbM]V-o  
 ShowWindow(SW_SHOW); Y{vwOs  
 SetForegroundWindow(); QM_X2Ho  
 ShowWindow(SW_SHOWNORMAL); r/hyW6e_  
 bTray=FALSE; cO+Xzd;838  
} V< ApHb  
-{U>} Y)  
void CCaptureDlg::OnChange() <W59mweW#5  
{ ~+ s*\~  
 RegisterHotkey(); l@r wf$-  
} ~vSAnjeR  
zX [ r  
BOOL CCaptureDlg::RegisterHotkey() $n Sh[ {  
{ 92]ZiL?k  
 UpdateData(); _T|H69 J  
 UCHAR mask=0; {lTxB'W@d  
 UCHAR key=0; $>"e\L4Kp  
 if(m_bControl) %M#?cmt  
  mask|=4; C]yQ "b  
 if(m_bAlt) h^+C)6(58n  
  mask|=2; k\sM;bCv7  
 if(m_bShift) Nv?-*&L  
  mask|=1; U5CPkH1  
  key=Key_Table[m_Key.GetCurSel()]; Ldhk^/+  
 if(bRegistered){ 1Uemsx%'k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); q7f;ZK=f  
  bRegistered=FALSE; +O$:  
 } N1N{Ol'  
 cMask=mask; 'K`Rbhy  
 cKey=key; )HX:U0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ? x"HX|n  
 return bRegistered; !@<@QG-  
} [Z5[~gP3  
p&sK\   
  四、小结 VkDS&g~Ws  
(y~laW!  
  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:
10+5=?,请输入中文答案:十五