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
  • 8016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: {.ypZ8JU  
  '}IGV`c  
  一、实现方法 \>x1#Vr>#V  
RK=Pm7L:`y  
  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: oU se~  
Q]e]\J  
#pragma data_seg("shareddata") @km4qJZ  
HHOOK hHook =NULL; //钩子句柄 2_}oOt?qiM  
UINT nHookCount =0; //挂接的程序数目 LXaq  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >>|47ps3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @WNqD*)1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~tn$AtK  
static int KeyCount =0; 2MmHO2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 f3S 8~!  
#pragma data_seg() ubRhJ~XB  
(2UA,  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 }B_?7+  
>~_z#2PA  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: `@ny!S|1/  
+;4;~>Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR QAAuFZs  
cKey,UCHAR cMask) yzZzaYv "/  
{ hu.p;A3p;  
 BOOL bAdded=FALSE; g#`}HuPoE  
 for(int index=0;index<MAX_KEY;index++){ MJkusR/  
  if(hCallWnd[index]==0){ &XCP@@T  
   hCallWnd[index]=hWnd; g)=$zXWhP  
   HotKey[index]=cKey; bg|dV  
   HotKeyMask[index]=cMask; F{^\vFp  
   bAdded=TRUE; Y`d@4*FN$  
   KeyCount++; '#SZ|Rr6tX  
   break; JI  cm$  
  } Jg)( F|>o  
 } Y=?{TX=6<[  
 return bAdded; ]>1`Fa6_  
} ug.|ag'R  
//删除热键 | P`b"x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }Xfg~ %6  
{ ~f"3Wa*\B  
 BOOL bRemoved=FALSE; kR3wbA  
 for(int index=0;index<MAX_KEY;index++){ `Ns Q&G  
  if(hCallWnd[index]==hWnd){ !&:Cp_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  ? 8/r=  
    hCallWnd[index]=NULL; {~w(pAx  
    HotKey[index]=0; h(R7y@mp\0  
    HotKeyMask[index]=0; V'tR \b  
    bRemoved=TRUE; Zb2PFwcy  
    KeyCount--; % 8wBZ~1-  
    break; $-u c#57  
   } %|ClYr  
  } 'HJ+)[0X*  
 } v 2 p  
 return bRemoved; (P;TM1k  
} K^o{lyK;@~  
m.!LL]]  
<VSB!:ew  
  DLL中的钩子函数如下: TGU7o:2  
*rbgDaQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j Neb*dPoK  
{ M$Bb,s  
 BOOL bProcessed=FALSE; QmSMDWkh  
 if(HC_ACTION==nCode) 'n>44_7L  
 { %hN(79:g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,i|K} Y&  
   switch(wParam) E_I-.o|  
   {  pJs`/   
    case VK_MENU: g],]l'7H  
     MaskBits&=~ALTBIT; $STGH  
     break; V8nQ/9R;  
    case VK_CONTROL: $_;rqTk]g  
     MaskBits&=~CTRLBIT; {to(?`Y  
     break; qA\&%n^ j]  
    case VK_SHIFT: vH-|#x~  
     MaskBits&=~SHIFTBIT; B8?9L8M}  
     break; po\jhfn  
    default: //judge the key and send message :3XvHL0rx  
     break; _'1 7C /  
   } lZ)6d-vK  
   for(int index=0;index<MAX_KEY;index++){ xf/K+  
    if(hCallWnd[index]==NULL) . AOc$Nt  
     continue; mtkZF{3Jx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M$Ui=GGq  
    { "U"fsAc#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0^\H$An*k  
     bProcessed=TRUE; e$P^},0/  
    } TB?'<hD:  
   } 0Ze&GK'Hf  
  } &WLN   
  else if((lParam&0xc000ffff)==1){ //有键按下 R9^vAS4t[O  
   switch(wParam) H\n6t-l  
   { DTuco9yr[  
    case VK_MENU: EC0B6!C&7  
     MaskBits|=ALTBIT; )B +o F7  
     break; ZMZWO$"K1  
    case VK_CONTROL: r7>FH!=:  
     MaskBits|=CTRLBIT; 9M'"q7Kh  
     break; R-dv$z0  
    case VK_SHIFT: G7|d$!%  
     MaskBits|=SHIFTBIT; pbDr:kBL  
     break; 3UW`Jyd`k  
    default: //judge the key and send message rPBsr<k#5  
     break; TTl9xs,nO  
   } jD"nEp-  
   for(int index=0;index<MAX_KEY;index++){ p7Zeudmj  
    if(hCallWnd[index]==NULL) 1%vE7a>{  
     continue; _Dqi#0#40p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Gey-8  
    { _<jU! R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,mvFeo;@f  
     bProcessed=TRUE; H)E,([   
    } ~Q Q1ZP3  
   } ~PQR_?1  
  } 568M4xzi  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 XUh&an$  
   for(int index=0;index<MAX_KEY;index++){ ^H2TSaJ;  
    if(hCallWnd[index]==NULL) xu"-Uj1  
     continue; ,1B4FAR&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r}e(MT:R'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q?LzL(OioN  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K3h];F! ^  
   } {+cx}`  
  } U';)]vB$  
 } ^Ss <<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); PPrvVGP   
} ewN|">WXQ  
T"3LO[j+  
  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: bv(+$YR  
E&z^E2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FZ<6kk4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ) ?kbHm  
mZ? jpnd  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: PWvTC`?  
~N| aCi-X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bA Yp }  
{ NX(IX6^y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) SeS ZMv  
 { *c/|/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 %rnRy<9  
  SaveBmp(); YqXN|&  
  return FALSE; }j1;0kb?  
 } W7~_XI  
 …… //其它处理及默认处理 >YXb"g@.  
} P8=J0&5  
y]obO|AH  
?P9VdS1-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 )v+&l9D  
oNl-! W   
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 5>CeFy  
,K6ODtw.  
  二、编程步骤 k5bv57@  
g(s}R ?  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; {Fyw<0 [@  
s2QgR37s>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \8a014  
Wt!;Y,1 s  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; imwn)]LR  
kn HrMD;  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; XAF]B,h=  
H&F2[j$T  
  5、 添加代码,编译运行程序。 xDekC~ Zq  
@q]!C5  
三、程序代码 'cQ`jWZQ  
oz:J.<j24Z  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d3?gh[$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :mCGY9d4L  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +JD^5J,-NJ  
#if _MSC_VER > 1000 >2}*L"YC  
#pragma once &.z-itiV  
#endif // _MSC_VER > 1000 *"F*6+}w"  
#ifndef __AFXWIN_H__ h<?I?ZR0$  
#error include 'stdafx.h' before including this file for PCH cMy?&  
#endif F{7 BY~d  
#include "resource.h" // main symbols L7(.dO0C  
class CHookApp : public CWinApp F3Da-6T@  
{ _3f/lG?&-  
 public: ;9=4]YZt  
  CHookApp(); G+C{_o#3  
  // Overrides s%> u[-9U  
  // ClassWizard generated virtual function overrides kaEu\@%n  
  //{{AFX_VIRTUAL(CHookApp) 5qqU8I  
 public: z=jzr=lP  
  virtual BOOL InitInstance(); j `3IizN2  
  virtual int ExitInstance(); ?W?n l:F  
  //}}AFX_VIRTUAL B@\0b|  
  //{{AFX_MSG(CHookApp) q4"^G:  
  // NOTE - the ClassWizard will add and remove member functions here. aG@GJ@w  
  // DO NOT EDIT what you see in these blocks of generated code ! >/@Q7V99{  
  //}}AFX_MSG ^H<VH  
  DECLARE_MESSAGE_MAP() A"+t[0$.  
}; 436SIh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )F'hn+(B|G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7A<}JaE!,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )0;O<G] d  
BOOL InitHotkey(); {EU]\Mp0j  
BOOL UnInit(); I] m&h!  
#endif /dX,]OFm  
|?' gT" #  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vl%Pg !l  
#include "stdafx.h" 7#*O|t/'  
#include "hook.h" aM8z_j!!u  
#include <windowsx.h> &|zV Wl  
#ifdef _DEBUG 5KYR"-jY  
#define new DEBUG_NEW a,M/i&.e`  
#undef THIS_FILE mn{R>  
static char THIS_FILE[] = __FILE__; o1]1I9  
#endif -M[BC~!0;  
#define MAX_KEY 100 S|@ Y !  
#define CTRLBIT 0x04 ;Oqbfl#%  
#define ALTBIT 0x02 1 EV0Y]T1  
#define SHIFTBIT 0x01 =E~SaT  
#pragma data_seg("shareddata") <sGioMr  
HHOOK hHook =NULL; >6;RTN/P2  
UINT nHookCount =0; ;]/cCi  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JvW!w)$pY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT wYHyVY2tj2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )GC[xo4bg  
static int KeyCount =0; aO\@5i_r  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift FW<YN;  
#pragma data_seg() Gh'{O/F4*  
HINSTANCE hins; 5M3)7  
void VerifyWindow(); O,I7M?dRf  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hM(Hq4ed,  
//{{AFX_MSG_MAP(CHookApp) *O Kve  
// NOTE - the ClassWizard will add and remove mapping macros here. )7rMevF(xJ  
// DO NOT EDIT what you see in these blocks of generated code! VN@ZYSs  
//}}AFX_MSG_MAP 5hiuBf<  
END_MESSAGE_MAP() T5 BoOVgO  
VK4"  
CHookApp::CHookApp() %o0.8qVJi  
{ JlH5 <:#PN  
 // TODO: add construction code here, OPKmYzf@b  
 // Place all significant initialization in InitInstance {+QQ<)l^tJ  
} 1g|6,J  
MP8s}  
CHookApp theApp; ;wr]_@<~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lCK:5$ z0  
{ (]<G)+*  
 BOOL bProcessed=FALSE; q]*:RI?wGT  
 if(HC_ACTION==nCode) f6HDfJmE  
 { sE(mK<{pk  
  if((lParam&0xc0000000)==0xc0000000){// Key up pQ+4++7ID  
   switch(wParam) j%*<W> O  
   { |:`gjl_Nf  
    case VK_MENU: P$;_YLr  
     MaskBits&=~ALTBIT; vnz}Pr! c  
     break; jCt[I5"+z  
    case VK_CONTROL: 9n".Q-V;k  
     MaskBits&=~CTRLBIT; ;|K(6)  
     break; Aa%ks+1  
    case VK_SHIFT: |G-o&m"  
     MaskBits&=~SHIFTBIT; 'P-FeN^  
     break; RK=YFE 0  
    default: //judge the key and send message s0'Xihsw6  
     break; <QE/p0.  
   } \hZ9in`YlR  
   for(int index=0;index<MAX_KEY;index++){ IAn/?3a~  
    if(hCallWnd[index]==NULL) en gh3TZC  
     continue; 3^AS8%qG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;0++):30V  
    { ;,LlOR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V6 ,59  
     bProcessed=TRUE; )'?@raB!  
    } .J|" bs9  
   } ^`!EpO>k9  
  } iW <B1'dp  
  else if((lParam&0xc000ffff)==1){ //Key down YPav5<{a  
   switch(wParam) P}Ule|&LK  
   { = P {]3K  
    case VK_MENU: R:DW>LB  
     MaskBits|=ALTBIT; [k6 5i  
     break; })r[q sv  
    case VK_CONTROL: "PPn^{bYm  
     MaskBits|=CTRLBIT; E)l@uPA'1  
     break; nbz?D_  
    case VK_SHIFT: ;tLu  
     MaskBits|=SHIFTBIT; {mV,bg,}~  
     break; *YY:JLe  
    default: //judge the key and send message -n$fh::^  
     break; +2]{% =  
   } w-MnJ(r  
   for(int index=0;index<MAX_KEY;index++) %!1:BQ,p,i  
   { Y3I+TI>x  
    if(hCallWnd[index]==NULL) I"+;L4o`  
     continue; c=HL 6v<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f_Q_qckB%x  
    { WAcQRa~C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); MA:8g D  
     bProcessed=TRUE; Z$5@r2d)  
    } 9Q%Fel.  
   } eJ!a8   
  } D8Vb@5MW  
  if(!bProcessed){ T|[ o  
   for(int index=0;index<MAX_KEY;index++){ "n@=.x  
    if(hCallWnd[index]==NULL) iPJZ%  
     continue; 8[;U|SR"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -xf=dzm)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G%K<YyAP  
   } (UTt_ry g  
  } TNC,{sM  
 } XA:v:JFS  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fXYg %  
} <%Re!y@OL  
TNV#   
BOOL InitHotkey() aOj5b>>  
{ X"{s"Mc0G  
 if(hHook!=NULL){ l4d2 i;4BK  
  nHookCount++; u37@9  
  return TRUE; =jmn  
 } ghiFI<)VY  
 else wLC|mByq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A`Bg"k:D  
  if(hHook!=NULL) .HG0%Vp  
   nHookCount++; l$Y7CIH  
  return (hHook!=NULL); %-:6#b z  
} 8P'>%G<m  
BOOL UnInit() vf(\?Js ,  
{ T{j&w%(z  
 if(nHookCount>1){ _>*$%R  
  nHookCount--; A_@#V)D2  
  return TRUE; LE!3'^Zq  
 } E-i rB/0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @hWt.qO3s  
 if(unhooked==TRUE){ {j E}mzi  
  nHookCount=0; Y0U<l1(|  
  hHook=NULL; ^YKEc0"w(  
 } }45&s9m=  
 return unhooked; Ydu=J g5u7  
} Qp${/  
J%_ :A"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'on, YEp  
{ @&d/}Mx"t  
 BOOL bAdded=FALSE; OY6l t.t  
 for(int index=0;index<MAX_KEY;index++){ *Oo2rk nQ  
  if(hCallWnd[index]==0){ C=AX{sn  
   hCallWnd[index]=hWnd; [N925?--S  
   HotKey[index]=cKey; 6kKIDEX  
   HotKeyMask[index]=cMask; X4Eq/q"  
   bAdded=TRUE; r>`65o  
   KeyCount++; /W/ =OPe  
   break; e ?H`p"l  
  } w.Ft-RXA W  
 } aC$hg+U$G  
 return bAdded; mg*[,_3q33  
} z.pP~he  
W04-D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bY;ah;<  
{ oO>mGl36H  
 BOOL bRemoved=FALSE; `hL16S  
 for(int index=0;index<MAX_KEY;index++){ 5>JrTO 5  
  if(hCallWnd[index]==hWnd){ dH zo_VV  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t8 #&bU X  
    hCallWnd[index]=NULL; X'WbS  
    HotKey[index]=0; 'zZN]P  
    HotKeyMask[index]=0; m4|9p{E  
    bRemoved=TRUE; A3bE3Fk$  
    KeyCount--; !["WnF{5eC  
    break; H{`S/>)[   
   } m> ?OjA!  
  } 2bfKD'!aH  
 } 4?,N;Q  
 return bRemoved; _w=si?q  
} 'cT R<LVo  
3ePG=^K^  
void VerifyWindow() L*1C2EL/q  
{ `(EY/EsY  
 for(int i=0;i<MAX_KEY;i++){ =\?KC)F*e  
  if(hCallWnd!=NULL){ ~k4S~!(U0  
   if(!IsWindow(hCallWnd)){ ,)nO   
    hCallWnd=NULL; PygaW&9Z|d  
    HotKey=0; gz-}nCSi  
    HotKeyMask=0; ,Rk;*MEMJ  
    KeyCount--; ">lu8F  
   } r+;op_  
  } c Q|nL  
 } /A4zR  
} 4E}/{1  
9#iu#?*B  
BOOL CHookApp::InitInstance() |28z4.  
{  =h\,-8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;dNKe.`Dg  
 hins=AfxGetInstanceHandle(); cRK1JxU  
 InitHotkey(); 7g cr$&+e  
 return CWinApp::InitInstance(); JV Fn=Mw  
} _1 f!9ghT\  
\SS1-UbL  
int CHookApp::ExitInstance() <|~X,g;f  
{ <l(LQmM;  
 VerifyWindow(); U`D/~KJ{Y  
 UnInit(); q<yp6Q3^  
 return CWinApp::ExitInstance(); 8/x@|rjW  
} #7+oM8b  
34Q l7LQp[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AF>J8V  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) fn(KmuNA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |[;9$Vn  
#if _MSC_VER > 1000 +HQX]t:Y  
#pragma once Ua)ARi %  
#endif // _MSC_VER > 1000 B)O{+avu  
(hS j4Cp  
class CCaptureDlg : public CDialog ds,NNN<HW  
{ iVLfAN @  
 // Construction N2vSJ\u  
 public: kqYWa`eE  
  BOOL bTray; BYFvf(>  
  BOOL bRegistered; oQ1>*[e<u  
  BOOL RegisterHotkey(); KyK%2:  
  UCHAR cKey; K>Dn#"{Y  
  UCHAR cMask; 9o"k 7$  
  void DeleteIcon(); $a>,sL&;  
  void AddIcon(); +*]"Yo~]}  
  UINT nCount; D.9qxM"Z>  
  void SaveBmp(); *Fb]lM7D  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor k*d0ws#<l  
  // Dialog Data @k>}h\w  
  //{{AFX_DATA(CCaptureDlg) %{WS7(si  
  enum { IDD = IDD_CAPTURE_DIALOG }; Tz[ck 'k  
  CComboBox m_Key; OZ3iH%  
  BOOL m_bControl; -/Pg[Lx7Pb  
  BOOL m_bAlt; c"Ddw'?e  
  BOOL m_bShift; $n\{6Rwb  
  CString m_Path; 1%68Pnqk  
  CString m_Number; ABw:SQ6=Q  
  //}}AFX_DATA U}<5%"!;  
  // ClassWizard generated virtual function overrides E*'sk  
  //{{AFX_VIRTUAL(CCaptureDlg) kAA1+rG  
 public: :*Lr(-N-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7)tkqfb]  
 protected: ~v"4;A 6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @&p:J0hbp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); awkPFA*c'  
  //}}AFX_VIRTUAL :jlKj}4A  
  // Implementation 3oc p4x`[  
 protected: E1IT>_  
  HICON m_hIcon; Fcz7   
  // Generated message map functions 4u- mE  
  //{{AFX_MSG(CCaptureDlg) #m=TK7*v  
  virtual BOOL OnInitDialog(); vVQwuV  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \!M6-kmi  
  afx_msg void OnPaint(); S-l<+O1fy  
  afx_msg HCURSOR OnQueryDragIcon(); q#B=PZ'NA  
  virtual void OnCancel(); Ut.%=o;&[  
  afx_msg void OnAbout(); m/@ ;N,K  
  afx_msg void OnBrowse(); !Hq$7j_  
  afx_msg void OnChange(); 2o2jDQ|7  
 //}}AFX_MSG OGW,[k= 2{  
 DECLARE_MESSAGE_MAP() A!B: vJ  
}; /9T.]H ~  
#endif _)-t#Ve  
fUj[E0yOF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C+o1.#]JM  
#include "stdafx.h" n-zAkKM  
#include "Capture.h" T%74JRQ  
#include "CaptureDlg.h" ~(i#A>   
#include <windowsx.h> >-U'mkIH  
#pragma comment(lib,"hook.lib") }huj%Pnk )  
#ifdef _DEBUG 3-x ;_  
#define new DEBUG_NEW *\Z9=8yK  
#undef THIS_FILE 9U~fc U6  
static char THIS_FILE[] = __FILE__; U )kl !  
#endif >T84NFdz+  
#define IDM_SHELL WM_USER+1 Buc{dcL/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NULew]:5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U'~M(9uv:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; J5dwd,FQ  
class CAboutDlg : public CDialog s krdL.5  
{ by07l5  
 public: uCkXzb9_z  
  CAboutDlg(); S 7pf QF  
  // Dialog Data AXnRA W  
  //{{AFX_DATA(CAboutDlg) CjR!dh1w_  
  enum { IDD = IDD_ABOUTBOX }; eX)'C>4W  
  //}}AFX_DATA u}I-#j)wap  
  // ClassWizard generated virtual function overrides {A^3<=|  
  //{{AFX_VIRTUAL(CAboutDlg) wwh1aV *  
 protected: NM FgCL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uuHg=8(  
  //}}AFX_VIRTUAL EzII!0 F  
  // Implementation 2<$pai"yl  
 protected: 'q>2WP|UY9  
  //{{AFX_MSG(CAboutDlg) 7R5m|h`M  
  //}}AFX_MSG a]H&k$!c  
  DECLARE_MESSAGE_MAP() ^IQtXae6M  
}; _[)f<`!g_V  
Hk&op P9)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^wass_8  
{ qwhDv+o  
 //{{AFX_DATA_INIT(CAboutDlg) >EE}P|=-  
 //}}AFX_DATA_INIT M./1.k&@  
} z)%Ke~)<\@  
U:r^4,Mz*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p : {,~ 1  
{ :m]KVcF.  
 CDialog::DoDataExchange(pDX); %f)%FN . S  
 //{{AFX_DATA_MAP(CAboutDlg) 79&=MTM  
 //}}AFX_DATA_MAP C#qF&n  
} i.Rxx, *?  
pyUzHF0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Fs$mLa  
 //{{AFX_MSG_MAP(CAboutDlg) B:)PUBb  
 // No message handlers P5Bva  
 //}}AFX_MSG_MAP G*s5GG@Z.  
END_MESSAGE_MAP() SI`ems{1>c  
H 0( .p'eN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^O0trM>h-  
: CDialog(CCaptureDlg::IDD, pParent) @`mr|-Rp@  
{ J]W? V vv  
 //{{AFX_DATA_INIT(CCaptureDlg) xe"A;6H  
  m_bControl = FALSE; !LR9}Xon  
  m_bAlt = FALSE; ]ZR}Pm/CA  
  m_bShift = FALSE; dzk1!yy  
  m_Path = _T("c:\\"); /07iQcT(  
  m_Number = _T("0 picture captured."); mX2X.ww(4  
  nCount=0; jXPf}{^  
  bRegistered=FALSE;  "tT68  
  bTray=FALSE; cqYMzS t  
 //}}AFX_DATA_INIT ^O.` P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4Sz2 9\X  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /9b+I/xY"  
} _|r/* (hh  
"]T1DG"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a#D \8;  
{ + L [a  
 CDialog::DoDataExchange(pDX); ?`= <*{_o  
 //{{AFX_DATA_MAP(CCaptureDlg) ~%eZQgqA*  
  DDX_Control(pDX, IDC_KEY, m_Key); =Q,D3F -+f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bV$g]->4e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \J(kevX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _TwE ym.V  
  DDX_Text(pDX, IDC_PATH, m_Path); / z m+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); w-];!;%  
 //}}AFX_DATA_MAP btOx\y}  
} [jz@d\k$_  
HQZJK82  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wZ5k|5KtW  
//{{AFX_MSG_MAP(CCaptureDlg) HCKocL/]h  
 ON_WM_SYSCOMMAND() _BEDQb{"|  
 ON_WM_PAINT() EG8%X"p  
 ON_WM_QUERYDRAGICON() ZU$QwI8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ep6V2R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6&"*{E  
 ON_BN_CLICKED(ID_CHANGE, OnChange) i"0*)$ h W  
//}}AFX_MSG_MAP lSfPOx;*  
END_MESSAGE_MAP() 9=J 3T66U  
nt%fJ k  
BOOL CCaptureDlg::OnInitDialog() /2Z7  
{ a|5<L  
 CDialog::OnInitDialog(); O]XgA0]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T |&u?  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^V~^[Yp  
 CMenu* pSysMenu = GetSystemMenu(FALSE); R5 i xG9  
 if (pSysMenu != NULL) _'|C-j`u$  
 { )gx*;z@  
  CString strAboutMenu; $a|>>?8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5g`J}@"k  
  if (!strAboutMenu.IsEmpty()) #Vhr 1;j  
  { IL,iu  
   pSysMenu->AppendMenu(MF_SEPARATOR); 33ZHrZ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jt:)(&-t   
  } >E7s}bL"  
 } 4j}.=u*X7  
 SetIcon(m_hIcon, TRUE); // Set big icon @X2zIFm  
 SetIcon(m_hIcon, FALSE); // Set small icon ?AVnv(_  
 m_Key.SetCurSel(0); bN&DotG  
 RegisterHotkey(); :*vSC:q  
 CMenu* pMenu=GetSystemMenu(FALSE); _}gfec4o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e#vGrLs.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }Ui)xi:8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \maj5VlJ  
 return TRUE; // return TRUE unless you set the focus to a control x6Tpt^N}  
} HqI[]T@  
Y=i_2R2e2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KGf@d*ZOMz  
{ k$.l^H u  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {z9,CwJan?  
 { I* P xQ  
  CAboutDlg dlgAbout; Zbr1e5?  
  dlgAbout.DoModal(); sC ?e%B  
 } =eR#]d  
 else ~<}?pDA}~  
 { o{' J O3  
  CDialog::OnSysCommand(nID, lParam); /eBcPu"[Vb  
 } ? <w[ZWytm  
} 'JO}6 ;W  
t]{, 7.S  
void CCaptureDlg::OnPaint() y#P _ }Kfo  
{ E*yot[kj  
 if (IsIconic()) k!T-X2L=  
 { [,Y;#;   
  CPaintDC dc(this); // device context for painting 7CCSG{k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a *bc#!e  
  // Center icon in client rectangle @7t*X-P.;-  
  int cxIcon = GetSystemMetrics(SM_CXICON); |}: D_TX  
  int cyIcon = GetSystemMetrics(SM_CYICON); [fJxbr"  
  CRect rect; + jN)$Y3Ya  
  GetClientRect(&rect); Bnz}:te}  
  int x = (rect.Width() - cxIcon + 1) / 2; gF]IAZCi  
  int y = (rect.Height() - cyIcon + 1) / 2; P@<K&S+f  
  // Draw the icon KfSbm?  
  dc.DrawIcon(x, y, m_hIcon); PWV+ M@  
 } iA4VT,  
 else .B! L+M< [  
 { 3!Mb<W.3  
  CDialog::OnPaint(); - v=ndJ.  
 } uZP( -}  
} Qqd+=mgc  
#UnGU,J  
HCURSOR CCaptureDlg::OnQueryDragIcon() QZ5%nJme_  
{ FC4hvO(/m  
 return (HCURSOR) m_hIcon; qvs[Gkaa@  
} 9?|m ^  
.4!wp&  
void CCaptureDlg::OnCancel() ^fU,9  
{ 618bbftx{  
 if(bTray) :io~{a#.2\  
  DeleteIcon(); t&C0V|s79$  
  CDialog::OnCancel(); m xy=3cUi  
} G[ q<P  
'<wZe.Q!  
void CCaptureDlg::OnAbout() kqCUr|M.P  
{ m.U&O=]5  
 CAboutDlg dlg; >BjZ{7?Ok  
 dlg.DoModal(); cMfnc.P\K  
} 3ZAzv en  
`)H| &!wT  
void CCaptureDlg::OnBrowse() o6X<FE#8  
{ .Pa6HA !  
 CString str;  rjHW  
 BROWSEINFO bi; Tt{ft?H71  
 char name[MAX_PATH]; ab5i7@Ed  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .Zx7+`i  
 bi.hwndOwner=GetSafeHwnd(); 7': <I- Fm  
 bi.pszDisplayName=name; <*opVy^  
 bi.lpszTitle="Select folder"; %%Wn:c>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 1k)`C<l  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O.?q8T)n82  
 if(idl==NULL) (k %0|%eR  
  return; L ~$&+g  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P1ynCe  
 str.ReleaseBuffer(); w.Kp[  
 m_Path=str; w'Jo).OW~  
 if(str.GetAt(str.GetLength()-1)!='\\') 6o GF6C  
  m_Path+="\\"; g1q%b%8T  
 UpdateData(FALSE); rgu7g  
} n{E + r  
1gH>B5`  
void CCaptureDlg::SaveBmp() Byns6k  
{ p{JE@TM  
 CDC dc; 3UGdXufw  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3 J\&t4q  
 CBitmap bm; 1c $iW>0K  
 int Width=GetSystemMetrics(SM_CXSCREEN); -PH qD  
 int Height=GetSystemMetrics(SM_CYSCREEN); gjy:o5{vA*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); q%FXox~b  
 CDC tdc; 7=4V1FS6i  
 tdc.CreateCompatibleDC(&dc); ld'Aaxl&  
 CBitmap*pOld=tdc.SelectObject(&bm); c6HH%|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jhE3@c@pT  
 tdc.SelectObject(pOld); v?4MndR  
 BITMAP btm; j`"cU$NRM  
 bm.GetBitmap(&btm); _MGhG{p7t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; D?cE$P  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |R>I#NO5  
 BITMAPINFOHEADER bih; bhT:MW!  
 bih.biBitCount=btm.bmBitsPixel; #]Q.B\\  
 bih.biClrImportant=0; K-7i4 ~  
 bih.biClrUsed=0; G;bE_O  
 bih.biCompression=0; Y.8mgy>   
 bih.biHeight=btm.bmHeight; mr`EcO0  
 bih.biPlanes=1; zC$(/nZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); a~;`&Uj  
 bih.biSizeImage=size; xwrleB  
 bih.biWidth=btm.bmWidth; ON$-g_s>)  
 bih.biXPelsPerMeter=0; Z65]|  
 bih.biYPelsPerMeter=0; &M+fb4:_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); e@L7p,  
 static int filecount=0; +DP{_x)t  
 CString name; Z+x`q#ZQr  
 name.Format("pict%04d.bmp",filecount++); .Ue1}'v*,  
 name=m_Path+name; J+8T Ie  
 BITMAPFILEHEADER bfh; Gw Z(3  
 bfh.bfReserved1=bfh.bfReserved2=0; btU:=6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); X6: c-  
 bfh.bfSize=54+size; U*Pi%J  
 bfh.bfOffBits=54; r1X\$&  
 CFile bf; m_1BB$lyP2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 38O_PK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (:T\<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W RVm^  
  bf.WriteHuge(lpData,size); ( cqVCys  
  bf.Close(); "4qv yVOE  
  nCount++; 6}e"$Ee}9  
 } m-!Uy$yM  
 GlobalFreePtr(lpData); @C6.~OiP  
 if(nCount==1) :w 4Sba3  
  m_Number.Format("%d picture captured.",nCount); NX:i]t  
 else s:#\U!>0`  
  m_Number.Format("%d pictures captured.",nCount); /CN`U7:E  
  UpdateData(FALSE); [P746b_\e  
} )k|_ CW~  
n6 a=(T  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) / L/hR4  
{ 69u"/7X  
 if(pMsg -> message == WM_KEYDOWN) &\GB_UA  
 { \LpR7D  
  if(pMsg -> wParam == VK_ESCAPE) 7q[a8rUdh  
   return TRUE; '`Iuf\  
  if(pMsg -> wParam == VK_RETURN) 7{e*isV  
   return TRUE; @s;qmBX4  
 } 4q\bnt  
 return CDialog::PreTranslateMessage(pMsg); l>O~^41[  
} r+%}XS%;h  
X,8 ]g.<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :;]iUjiC8  
{ cfd7)(6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P>3 ;M'KsO  
  SaveBmp(); /a!M6:,pX  
  return FALSE; i>68gfx  
} .0>2j(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ aM|^t:  
 CMenu pop; &I$MV5)u  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ("B[P/  
 CMenu*pMenu=pop.GetSubMenu(0); h|j $Jy  
 pMenu->SetDefaultItem(ID_EXITICON); 5u-jjUO  
 CPoint pt; oMV<Yn_<  
 GetCursorPos(&pt); /&#Gh?z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); / `Glf|  
 if(id==ID_EXITICON) Th6xwMq  
  DeleteIcon(); t\$P*_  
 else if(id==ID_EXIT) %Z=%E!*  
  OnCancel(); {FU,om9  
 return FALSE; 8=U0\<wT  
} TZk.?@s5  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6eh\-+=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Bqd'2HQd  
 AddIcon(); :_FnQhzg  
 return res; ^%?*u;uU%  
} OF)G 2>t  
'-7rHx  
void CCaptureDlg::AddIcon() Ej]:j8^W  
{ "ebm3t@C  
 NOTIFYICONDATA data; Nf<mgOAT1  
 data.cbSize=sizeof(NOTIFYICONDATA); ?(4E le  
 CString tip; /RzL,~]  
 tip.LoadString(IDS_ICONTIP); xQ=sZv^M  
 data.hIcon=GetIcon(0); |99/?T-QW  
 data.hWnd=GetSafeHwnd(); eZMDtB  
 strcpy(data.szTip,tip); V6C*d:  
 data.uCallbackMessage=IDM_SHELL; =x/Ap1  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O:Ixy?b;Z  
 data.uID=98; OJGEX}3'  
 Shell_NotifyIcon(NIM_ADD,&data); `"/s,"c:D  
 ShowWindow(SW_HIDE); "Vg1'd}f  
 bTray=TRUE; N%k6*FBp~  
} M(a lc9tn  
1sqBBd"=PY  
void CCaptureDlg::DeleteIcon() j[Y$)HF  
{ '518S"T @  
 NOTIFYICONDATA data; axSJ:j8  
 data.cbSize=sizeof(NOTIFYICONDATA);  M[^  
 data.hWnd=GetSafeHwnd(); ueyz@{On~  
 data.uID=98; +; P8QZK6  
 Shell_NotifyIcon(NIM_DELETE,&data); /Jjub3>Q  
 ShowWindow(SW_SHOW); ;|.^_Xs  
 SetForegroundWindow(); J .r^"K\  
 ShowWindow(SW_SHOWNORMAL); -r6cK,WVU  
 bTray=FALSE; wMB. p2  
} ?9E shw2  
<GbF4\ue  
void CCaptureDlg::OnChange() S~9K'\vO  
{ _qq> 43  
 RegisterHotkey(); CHeU?NtFps  
} Stkyz:,(  
Ca&5"aki  
BOOL CCaptureDlg::RegisterHotkey() iz&$q]P8  
{ avmuI^LLs  
 UpdateData(); S4m??B  
 UCHAR mask=0; ,F,\bp}  
 UCHAR key=0; ' DZYN {}  
 if(m_bControl) K/,y"DUN&  
  mask|=4; s\k4<d5  
 if(m_bAlt) H6Mqy}4W  
  mask|=2; E,S[3+  
 if(m_bShift) 6V"|  
  mask|=1; QgZwU$`p0  
  key=Key_Table[m_Key.GetCurSel()]; o"te7nBI  
 if(bRegistered){ "%o,P/<X  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :ub 4p4h*  
  bRegistered=FALSE; OD*\<Sc  
 } 7*9a`p3w  
 cMask=mask; lTe7n'y^^  
 cKey=key; KxZO.>,  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `K,{Y_  
 return bRegistered; L9|55z  
} Ho}"8YEXNV  
Rr'#OxF  
  四、小结 b) k\?'j  
UE-<  
  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 或 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