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
  • 6141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: GY,HEe]2r  
  v46 5Z  
  一、实现方法 (7_}UT@w-  
3c.,T  
  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: aaODj>  
V1Opp8  
#pragma data_seg("shareddata") 0B?t:XU,  
HHOOK hHook =NULL; //钩子句柄 TmIw?#q^  
UINT nHookCount =0; //挂接的程序数目 B)}.%G*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `suEN @^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $,9A?'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &;]KntxB  
static int KeyCount =0; R-V4Ju[:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 I8:A]  
#pragma data_seg() yvp$s  
RO+N>Wkt  
  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。 HJeZm  
eQqx0+-0c  
  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: w[X/|O  
qmx4hs8sh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~dc~<hK  
cKey,UCHAR cMask) W2F*+M  
{ #XPY\n^k  
 BOOL bAdded=FALSE; )D"E]  
 for(int index=0;index<MAX_KEY;index++){ <UC_QPA\  
  if(hCallWnd[index]==0){ {WoS&eL  
   hCallWnd[index]=hWnd; 6_wj,7  
   HotKey[index]=cKey; K{WLo5HP  
   HotKeyMask[index]=cMask; I@/+=  
   bAdded=TRUE; Ri mz~}+  
   KeyCount++; TKBW2  
   break; Q' qz(G0  
  } =AIeYUh  
 } 6A9 r{'1  
 return bAdded; 7lH3)9G;  
} LaCVI  
//删除热键 EAPjQA-B?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'Wz`P#/  
{ 6=o'.03\f  
 BOOL bRemoved=FALSE; z t|DHVy  
 for(int index=0;index<MAX_KEY;index++){ nWz7$O  
  if(hCallWnd[index]==hWnd){ ;S.o` z1GI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |)}&: xA%  
    hCallWnd[index]=NULL; Ufr,6IX  
    HotKey[index]=0; zIT)Hs5  
    HotKeyMask[index]=0; ;*}tbh3;.  
    bRemoved=TRUE; |s$w i>7l  
    KeyCount--; Z_.xglq{  
    break; L.tW]43K  
   } rZSD)I  
  } 0c6Ea>S[  
 } GI _.[  
 return bRemoved; }s++^uX6  
} 6I!B>V#U+  
g/f^|:  
O-jpS?@  
  DLL中的钩子函数如下: 3JJEj1O  
@zGz8IF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) UHT2a9rG  
{ O=E?m=FR"  
 BOOL bProcessed=FALSE; #<*=)[  
 if(HC_ACTION==nCode) wFX>y^ 1  
 { V|W[>/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 DP5}q"l  
   switch(wParam) la}Xo0nq0+  
   {  BDiN*.w5  
    case VK_MENU: ^Ez`WP  
     MaskBits&=~ALTBIT; >Xv Fg  
     break; u]uZc~T  
    case VK_CONTROL: 0 F-db  
     MaskBits&=~CTRLBIT; xjK@Q1MJ  
     break; +ko-oZ7V  
    case VK_SHIFT: e WWtMnq  
     MaskBits&=~SHIFTBIT; *P0sl( &  
     break; sRK oM  
    default: //judge the key and send message e[l#r>NT  
     break; (R|Ftjs .  
   } >o,l/# z  
   for(int index=0;index<MAX_KEY;index++){ 1 ` ={* *  
    if(hCallWnd[index]==NULL) VteMsL/H  
     continue; '}BYMEd/m%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N,ysv/zq7  
    { -4!S?rHwd+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Nm4 h  
     bProcessed=TRUE; NPjNkpWm&=  
    } }$X/HK  
   } c>.=;'2  
  } `m+o^!SGe  
  else if((lParam&0xc000ffff)==1){ //有键按下 Bb9/nsbE  
   switch(wParam) #L`'<ge'g*  
   { %s* F~E  
    case VK_MENU: ZXH{9hxd  
     MaskBits|=ALTBIT; yp l`vJ]X  
     break; e.VR9O]G  
    case VK_CONTROL: q:ah%x[  
     MaskBits|=CTRLBIT; s)9d\{  
     break; O~DdMW  
    case VK_SHIFT: }>$3B5}  
     MaskBits|=SHIFTBIT; sX[k}=HCK  
     break; u%b.#!  
    default: //judge the key and send message PSREQK@}E  
     break; gEISnMH  
   } Bm4fdf#A]  
   for(int index=0;index<MAX_KEY;index++){ ;5!M+nk  
    if(hCallWnd[index]==NULL) U#>K(  
     continue; tLSM]Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :TkR]bhm  
    { y^[?F>wB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); wzf%~ats  
     bProcessed=TRUE; y*H rv  
    } V_"UiN"o  
   } S2<evs1d  
  } BBDt^$  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !(nFq9~~Q  
   for(int index=0;index<MAX_KEY;index++){ A3eus  
    if(hCallWnd[index]==NULL) khe.+Qfgj  
     continue; 1 WUlBr/k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }!*CyO*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6BH P#B2j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @5tGI U;1  
   } /5N`E uw  
  } p,K!'\  
 } JDP/vNq  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D/&nEMp6  
} T0v{qQ  
J-5E# v  
  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: eJ+@<+vr;x  
QA=mD^A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }UX0 eI4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |f{(MMlj  
T%O2=h\} E  
  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: Bv{DZ?{s  
=.(~`ici~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;Q\MH t*  
{ " 3tk"#.#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;Z!x\{- L  
 { :R1F\FT*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J. $U_k  
  SaveBmp(); nxhn|v  
  return FALSE; ^?R8>97_?  
 } a?1Ml>R6P  
 …… //其它处理及默认处理 'bn$"A"{o  
} p-f"4vH  
'n/L1Fn  
`EWQ>m+  
  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。 BFvRU5&Sz  
%_. fEFy07  
  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。 @FaK/lKK  
s6(bTO.  
  二、编程步骤 `G "&IQ8.  
AQjf\i  
  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"; wu~?P`  
<~ }NxY\5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; t7 +U!  
H6Q!~o\"H  
  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; K+3+?oYKH  
K9QC$b9(  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; WPDi)U X  
;D|g5$OE&  
  5、 添加代码,编译运行程序。 Lq]t6o ]  
LO@o`JF  
三、程序代码 |31/*J!@z*  
UH`cWVLpr  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL m8<.TCIQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %`\=qSf*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Wa<SYJ  
#if _MSC_VER > 1000 cceh`s=cU  
#pragma once ,;)_$%bHc  
#endif // _MSC_VER > 1000 QC<O=<$Q[  
#ifndef __AFXWIN_H__ CXh >'K  
#error include 'stdafx.h' before including this file for PCH w`X0^<Fv  
#endif c1ptN  
#include "resource.h" // main symbols L "5;<  
class CHookApp : public CWinApp M,dp;  
{ qZYh^\  
 public: a\*_b2 ^n  
  CHookApp(); G'{*guYU  
  // Overrides x:iLBYf  
  // ClassWizard generated virtual function overrides o}e]W,  
  //{{AFX_VIRTUAL(CHookApp) {]Ec:6  
 public: MuF{STE>->  
  virtual BOOL InitInstance(); X86r`}  
  virtual int ExitInstance(); ZZrv l4h  
  //}}AFX_VIRTUAL zbAyYMtEk  
  //{{AFX_MSG(CHookApp) Mz: "p.  
  // NOTE - the ClassWizard will add and remove member functions here. v,Uu )Z  
  // DO NOT EDIT what you see in these blocks of generated code ! UTVqoCHA  
  //}}AFX_MSG )-^[;:B\k"  
  DECLARE_MESSAGE_MAP() W%@0Ym `7  
}; Xq%ijo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); k{J\)z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pcNpr`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >l^[73,]L  
BOOL InitHotkey(); NeR1}W  
BOOL UnInit(); "L+NN|  
#endif J[al4e^  
,qwVDYJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. kE854Ej  
#include "stdafx.h" [sZ ,nB/  
#include "hook.h" 1s-=zs  
#include <windowsx.h> Np@RK1}  
#ifdef _DEBUG ]ASTw(4  
#define new DEBUG_NEW  L0>7v  
#undef THIS_FILE WZ N0`Od  
static char THIS_FILE[] = __FILE__; Ntlbn&lc;D  
#endif i|!W;2KL5  
#define MAX_KEY 100 0?*":o30  
#define CTRLBIT 0x04 d@ef+-  
#define ALTBIT 0x02 OZ4%6/  
#define SHIFTBIT 0x01 `>u^Pm  
#pragma data_seg("shareddata") o[aIQ|G  
HHOOK hHook =NULL; ?0?+~0sI  
UINT nHookCount =0; .#LvvAeh  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey JZ)w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d,E2l~s  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #D^( dz*  
static int KeyCount =0; #{5h6IC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o!zo%#0;#)  
#pragma data_seg() AZva  
HINSTANCE hins; [/U5M>#n  
void VerifyWindow(); OjsMT]  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) y*T@_on5  
//{{AFX_MSG_MAP(CHookApp) o'=i$Eb  
// NOTE - the ClassWizard will add and remove mapping macros here. nZ4@g@e2  
// DO NOT EDIT what you see in these blocks of generated code! O'S9y  
//}}AFX_MSG_MAP T/ P   
END_MESSAGE_MAP() bA07zI2  
jdd3[  
CHookApp::CHookApp() A'suZpL  
{ '5\?l:z  
 // TODO: add construction code here, eA-$TSWh  
 // Place all significant initialization in InitInstance ^C~t)U  
} ;aDYw [  
?i$MinK  
CHookApp theApp; @=qWwt4~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K~A@>~vFb  
{ +r$VrNVs  
 BOOL bProcessed=FALSE; /2Bf6  
 if(HC_ACTION==nCode) 22R ,  
 { >'v{o{k|C  
  if((lParam&0xc0000000)==0xc0000000){// Key up Rts.jm>[  
   switch(wParam) p~z\&&0U0  
   { naM=oSB(  
    case VK_MENU: &/$3>MD2`  
     MaskBits&=~ALTBIT; P.3kcZ   
     break; $?y\3GX  
    case VK_CONTROL: uo3o[ H&#  
     MaskBits&=~CTRLBIT; V Ku|=m2vB  
     break; <*z9:jz Q  
    case VK_SHIFT: e7n` fEpO  
     MaskBits&=~SHIFTBIT; &XB1=b5  
     break; {CQI*\O  
    default: //judge the key and send message lh-zE5;  
     break; nQ;M@k&9eV  
   } ZmS ]4WM<  
   for(int index=0;index<MAX_KEY;index++){ R:U!HE8j   
    if(hCallWnd[index]==NULL) U /jCM?~  
     continue; JnS@}m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {; 3a^K  
    { ; Z2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !-tVt D  
     bProcessed=TRUE; !=]cASPGD  
    } CJt(c,!z  
   } E+P-)bRa  
  } ^]9.$$GU\A  
  else if((lParam&0xc000ffff)==1){ //Key down 95*=& d  
   switch(wParam) 7upN:7D-  
   { |M|>/U 8  
    case VK_MENU: bf/z T0  
     MaskBits|=ALTBIT; Xbc:Vr  
     break; =W"9a\m  
    case VK_CONTROL: Oe&gTXo  
     MaskBits|=CTRLBIT; qjH/E6GGg  
     break; HJ!P]X_J1  
    case VK_SHIFT: .x_F4#Ka  
     MaskBits|=SHIFTBIT; ?-=<7 ~$  
     break; %)=c#H1  
    default: //judge the key and send message KA elq*  
     break; VujIKc#4  
   } RC^k#+  
   for(int index=0;index<MAX_KEY;index++) yK w.69.  
   { _FzAf5DO  
    if(hCallWnd[index]==NULL) \1oN't.  
     continue; O[ug7\cl+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B1o*phM g  
    { W"H(HA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ( c +M"s  
     bProcessed=TRUE; F+/#ugI  
    } )@6iQ  
   } w5q'M  
  } PDpDkcy|QM  
  if(!bProcessed){ _.5AB E  
   for(int index=0;index<MAX_KEY;index++){ {=,+;/0  
    if(hCallWnd[index]==NULL) ^@;P-0Sy  
     continue; R?8/qGSVqJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^TAf+C^Ry  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3e1^r_YI  
   } B dxV [SF  
  } DS=Dg@y  
 } B1 xlWdm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?'^yw C`  
} dyt.( 2  
)pw53,7>aN  
BOOL InitHotkey() ,Ofou8C6  
{ !$#8Z".{v{  
 if(hHook!=NULL){ Cg]S`R-  
  nHookCount++; v(^;%  
  return TRUE; &W N R{  
 } 4GexYDk'#  
 else `Lr|KuFN  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); #./8inbG  
  if(hHook!=NULL) }M &hcw<  
   nHookCount++; 1  Lz  
  return (hHook!=NULL); b#Vm;6BHD1  
} $Fv|w9  
BOOL UnInit() uk)D2.eS,  
{ a t%qowt  
 if(nHookCount>1){ h`:B8+k  
  nHookCount--; c4M]q4]F  
  return TRUE; Ee'wsL  
 } iM"L%6*I^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); W=2#Q2)  
 if(unhooked==TRUE){ v+ "9&  
  nHookCount=0; +uMK_ds~  
  hHook=NULL; }PzHtA,V  
 } 'Xg9MS&  
 return unhooked; EkEQFd 5g  
} \/?&W[TF  
`,Y/!(:;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q=#Wk$1.  
{ @"0n8y  
 BOOL bAdded=FALSE; D "X`qF6U7  
 for(int index=0;index<MAX_KEY;index++){ e.]k4K  
  if(hCallWnd[index]==0){ |L~RC  
   hCallWnd[index]=hWnd; =8E GB\P  
   HotKey[index]=cKey; .gA4gI1kH  
   HotKeyMask[index]=cMask; j\2q2_f  
   bAdded=TRUE; 9Nu:{_YoP  
   KeyCount++; >RXDuCVi  
   break; 'V} 4_3#q  
  } 9tIE+RD  
 } WP4 "$W  
 return bAdded; ,pa=OF  
} I1!m;5-c9k  
HQV#8G#B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E*8).'S%k  
{ [+b&)jN*2  
 BOOL bRemoved=FALSE; P;ovPyoO  
 for(int index=0;index<MAX_KEY;index++){ }N@+bNh~  
  if(hCallWnd[index]==hWnd){ 8C<%Y7)/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [\.@,Y0j  
    hCallWnd[index]=NULL; 7z3YzQ=Kg  
    HotKey[index]=0; G/&Wc2k  
    HotKeyMask[index]=0; 6Wc.iomx8  
    bRemoved=TRUE; pt~b=+bBm  
    KeyCount--; gU@BEn}  
    break; N|asr,  
   } Hw~?%g:<S  
  } ;a`I8Fj  
 } ]SNcL[U  
 return bRemoved; m]/s R3yF  
} =xM:8 hm  
n4/Jx*  
void VerifyWindow() hmJa1fw=  
{ _yc &'Wq  
 for(int i=0;i<MAX_KEY;i++){ ? 9;r|G  
  if(hCallWnd!=NULL){ _[ S<Cb*1  
   if(!IsWindow(hCallWnd)){ AI2@VvB  
    hCallWnd=NULL; 2~QN#u|UC3  
    HotKey=0; P yN{  
    HotKeyMask=0; zE]h]$oi  
    KeyCount--; =Y-mc#{8  
   } b!z kQ?h  
  } >e QFY^d5  
 } HI{IC!6  
} nmUMg  
o7v,:e:  
BOOL CHookApp::InitInstance() B-[qS;PY%  
{ P30|TU+B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Vnnl~|Xx  
 hins=AfxGetInstanceHandle(); O 718s\#  
 InitHotkey(); w>6 cc#>q  
 return CWinApp::InitInstance(); q 1+{MPJ  
} e%JH q  
[,ZHn$\  
int CHookApp::ExitInstance() 5VGr<i&A  
{ `_>44!M  
 VerifyWindow(); OLyl.#J  
 UnInit(); 3ULn ]jA  
 return CWinApp::ExitInstance(); Ogp@!  
} VU \{<j{  
X&cm)o%5Fe  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g)^g_4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4i(?5p>f  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #\gx.2W7  
#if _MSC_VER > 1000 t? [8k&Z  
#pragma once Y]H,rO  
#endif // _MSC_VER > 1000 H]Vo XJ\*  
0R}F( tjw  
class CCaptureDlg : public CDialog nBGcf(BE.$  
{ R9O1#s^  
 // Construction Un\ T} c  
 public: Q ;$NDYV1  
  BOOL bTray; obSLy Ed  
  BOOL bRegistered; GJn ~x  
  BOOL RegisterHotkey(); ?TY/'-M5  
  UCHAR cKey; tz/NR/[  
  UCHAR cMask; /%i:(Ny  
  void DeleteIcon(); #iP5@:!Wm~  
  void AddIcon(); KU (g Zy  
  UINT nCount; 5DnX8t+d  
  void SaveBmp();  4,?ZNyl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3nX={72<b  
  // Dialog Data -)p| i~j^A  
  //{{AFX_DATA(CCaptureDlg) ]rc =oP;  
  enum { IDD = IDD_CAPTURE_DIALOG }; Hjc *W Tu  
  CComboBox m_Key; cUc:^wvLS  
  BOOL m_bControl; QZamf lk  
  BOOL m_bAlt; .?*TU~S  
  BOOL m_bShift; s?_H<u  
  CString m_Path; ZMmf!cKY:'  
  CString m_Number; d@>1m:p  
  //}}AFX_DATA 0'~Iv\s  
  // ClassWizard generated virtual function overrides d^^EfWU  
  //{{AFX_VIRTUAL(CCaptureDlg) Z'o'd_g>I+  
 public: e~NF}9#A  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]TIBy "3  
 protected: jt6,id)&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +<w\K*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T{zz3@2?  
  //}}AFX_VIRTUAL yf2$HF  
  // Implementation p+; La  
 protected: QW_W5|_  
  HICON m_hIcon; #wfb-`,5&9  
  // Generated message map functions {=<m^ 5b9  
  //{{AFX_MSG(CCaptureDlg) "wj-Qgz  
  virtual BOOL OnInitDialog(); W,ik ;P\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9\KMU@Ne  
  afx_msg void OnPaint(); _X]S`e1F  
  afx_msg HCURSOR OnQueryDragIcon(); |ZJ<N\\h-  
  virtual void OnCancel(); ?qR11A};tG  
  afx_msg void OnAbout(); 'uU{.bq  
  afx_msg void OnBrowse(); _ e94  
  afx_msg void OnChange(); `rZS\A  
 //}}AFX_MSG 1$1P9x@H  
 DECLARE_MESSAGE_MAP() :V^|}C#  
}; B),Z*lpC  
#endif nbdjk1E`~  
6$LQO),,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Z$:iq  
#include "stdafx.h" % n~ 'UA  
#include "Capture.h" )_\q)t"=  
#include "CaptureDlg.h" vDcYz,  
#include <windowsx.h> (?lKedA>2  
#pragma comment(lib,"hook.lib") zb& 3{,  
#ifdef _DEBUG |7%#z~rT  
#define new DEBUG_NEW {q|Om?@  
#undef THIS_FILE J:oAzBFpA  
static char THIS_FILE[] = __FILE__; a474[?  
#endif ,'>O#kD  
#define IDM_SHELL WM_USER+1 M*7:-Tb]C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HAc1w]{(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Bd>a"3fA  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p5JRG2zt  
class CAboutDlg : public CDialog od RtJ[   
{ =Bw2{]w  
 public: zt/N)5\V  
  CAboutDlg(); T7~Vk2o%(  
  // Dialog Data DBk]2W|i  
  //{{AFX_DATA(CAboutDlg) POt 8G  
  enum { IDD = IDD_ABOUTBOX }; vbSycZ2M7  
  //}}AFX_DATA o2W^!#]=  
  // ClassWizard generated virtual function overrides ! ,&{1p  
  //{{AFX_VIRTUAL(CAboutDlg) =uD^#AX  
 protected: 6uKS!\EY|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;cp,d~mrf  
  //}}AFX_VIRTUAL XG}9) fT  
  // Implementation R;`C;Rbf  
 protected: wi@Qf6(mn  
  //{{AFX_MSG(CAboutDlg) 'rDai [  
  //}}AFX_MSG p-JGDjR0G  
  DECLARE_MESSAGE_MAP() 6"<q{K  
}; tl+ 9SBl  
f&NXWo/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 9q_c`  
{ Ji7<UJ30x  
 //{{AFX_DATA_INIT(CAboutDlg) D'<'"kUd  
 //}}AFX_DATA_INIT MyaJhA6c  
} V3c7F4\  
OS sYmF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) s0*@zn>h  
{ eq,`T;  
 CDialog::DoDataExchange(pDX); #gSLFM{p  
 //{{AFX_DATA_MAP(CAboutDlg) <Xl/U^B  
 //}}AFX_DATA_MAP qUKSo9  
} QZv}\C-c  
~NG+DyGa=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^j]_MiA4  
 //{{AFX_MSG_MAP(CAboutDlg) 9s&Tv&%VN  
 // No message handlers 5Sx.'o$  
 //}}AFX_MSG_MAP l' 2C/#8F  
END_MESSAGE_MAP() tzrvIVD  
ki'CW4x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !8OgaMngzF  
: CDialog(CCaptureDlg::IDD, pParent) }) Zcw1g  
{ &AP`k  
 //{{AFX_DATA_INIT(CCaptureDlg) *I9O+/,  
  m_bControl = FALSE; dq^vK  
  m_bAlt = FALSE; 6 U_P  
  m_bShift = FALSE; M3Oqto<8"  
  m_Path = _T("c:\\"); *=(vIm[KL  
  m_Number = _T("0 picture captured."); ,yH\nqEz  
  nCount=0; 6o<(,\ad [  
  bRegistered=FALSE; |(3"_  
  bTray=FALSE; z#^;'nnw  
 //}}AFX_DATA_INIT Nx=rw h  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 D-4{9[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OZ, Xu&N  
} AA<QI'6  
JasA w7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]-cSTtO  
{ DIF-%X5  
 CDialog::DoDataExchange(pDX); !!d?o  
 //{{AFX_DATA_MAP(CCaptureDlg) DTvCx6:!  
  DDX_Control(pDX, IDC_KEY, m_Key); #eIFRNRb)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9nS fFGu  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bk:mk[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); KvXF zx|A  
  DDX_Text(pDX, IDC_PATH, m_Path); -;*lcY*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +F+M[ef<ws  
 //}}AFX_DATA_MAP ,-[z?dvO  
} hGJANA  
% O u'+A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;Q,, i  
//{{AFX_MSG_MAP(CCaptureDlg) a!B"WNb+  
 ON_WM_SYSCOMMAND() CN:z *g  
 ON_WM_PAINT() ;@xlrj+  
 ON_WM_QUERYDRAGICON() '8=/v*j>?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) W_lXY Z<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N5.B"l  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sW@_' Lw  
//}}AFX_MSG_MAP `G`y A%  
END_MESSAGE_MAP() bX>R9i$  
$[\\{XJ.  
BOOL CCaptureDlg::OnInitDialog() nXw98;  
{ ||4T*B06  
 CDialog::OnInitDialog(); v?_L_{x;W  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (D0\uld9  
 ASSERT(IDM_ABOUTBOX < 0xF000); tE,& G-jU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); EYA=fU  
 if (pSysMenu != NULL) Q2[; H!"  
 { yt<h!k$ _P  
  CString strAboutMenu; +`tk LvM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Q)im2o@z  
  if (!strAboutMenu.IsEmpty()) |enb5b78  
  { bE?X?[K  
   pSysMenu->AppendMenu(MF_SEPARATOR); =Y Y 7V!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -\n%K  
  } .F G%QFF~  
 } us+z8Mz  
 SetIcon(m_hIcon, TRUE); // Set big icon H*Tzw,f~ v  
 SetIcon(m_hIcon, FALSE); // Set small icon Rqr>B(|  
 m_Key.SetCurSel(0); rFaG-R  
 RegisterHotkey(); ty'/i!/\  
 CMenu* pMenu=GetSystemMenu(FALSE); 2'u%  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \rd%$hci  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e~7FK_y#0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r1:CHIwK  
 return TRUE; // return TRUE unless you set the focus to a control j4I ~  
} rn/~W[  
.3&( Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &f2:aT)  
{ 54=*vokX_  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %j.n^7i]^:  
 { I-#7Oq:Np  
  CAboutDlg dlgAbout; )D ~ 5  
  dlgAbout.DoModal(); K&eT*JW>  
 } OX%#8Lx  
 else U7Oa 13Qz  
 { 2T(7V[C%9  
  CDialog::OnSysCommand(nID, lParam); fbD,\ rjT  
 } )qe rA  
} y%?'<j  
'q?Y5@s  
void CCaptureDlg::OnPaint() `x_}mdR  
{ uVTacN%X  
 if (IsIconic()) #nw+U+qL  
 { zwz_K!229  
  CPaintDC dc(this); // device context for painting e;g7Ek3n  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @S:T8 *~}  
  // Center icon in client rectangle FbRGfHL[  
  int cxIcon = GetSystemMetrics(SM_CXICON); X9ZHYlr+Q  
  int cyIcon = GetSystemMetrics(SM_CYICON); tQas_K5  
  CRect rect; `QtkC>[  
  GetClientRect(&rect); +P8CC fPu  
  int x = (rect.Width() - cxIcon + 1) / 2; )ZI#F]  
  int y = (rect.Height() - cyIcon + 1) / 2; -K3d u&j  
  // Draw the icon "$pbK:  
  dc.DrawIcon(x, y, m_hIcon); u`D _  
 } 4}s'xMT!  
 else OTl9MwW  
 { .>z1BP:(  
  CDialog::OnPaint(); YgdQC(ib  
 } ?5J>]: +ZZ  
} "YaT1` Kr  
t<ZBp0  
HCURSOR CCaptureDlg::OnQueryDragIcon() ==Xy'n9'  
{ lX.-qCV"B  
 return (HCURSOR) m_hIcon; ,J,Rup">h  
} NGJst_  
(T%?@'\  
void CCaptureDlg::OnCancel() eL~3CAV{  
{ )[oP `Z  
 if(bTray) %}e['d h  
  DeleteIcon(); r8?p6E  
  CDialog::OnCancel(); 1wFW&|>1  
} S~)`{ \  
6VVxpDAi:  
void CCaptureDlg::OnAbout() (Gw*x sn1  
{ c@Br_ -  
 CAboutDlg dlg; .$7RF!p  
 dlg.DoModal(); ptrwZ8'  
} 4wkv#vi7!-  
^RO<r}B u  
void CCaptureDlg::OnBrowse() } C:i0Q  
{ _GFh+eS}  
 CString str; 1Iy1xiP  
 BROWSEINFO bi; mt$rjk=  
 char name[MAX_PATH]; '%wSs,HD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); v? OUd^  
 bi.hwndOwner=GetSafeHwnd();  %S%IW  
 bi.pszDisplayName=name; <b .p/uA  
 bi.lpszTitle="Select folder"; QkC*om'/!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v0VQ4>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @&Z^WN,x  
 if(idl==NULL) tH4 q*\U  
  return; _ xTpW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qZ'2M.;  
 str.ReleaseBuffer(); qxDMDMN  
 m_Path=str; wN58uV '  
 if(str.GetAt(str.GetLength()-1)!='\\') Hy1$Kvub  
  m_Path+="\\"; }Nd1'BVf  
 UpdateData(FALSE); >}\s-/  
} >$TvCw  
"[!b5f3!I  
void CCaptureDlg::SaveBmp() ' tY(&&  
{ +<.o,3  
 CDC dc; LRts W(A/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !^&VZh  
 CBitmap bm; #>("(euXMF  
 int Width=GetSystemMetrics(SM_CXSCREEN); f}"eN/T  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3>^]r jFw  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2|=hF9  
 CDC tdc; 8toOdh  
 tdc.CreateCompatibleDC(&dc); V:'F_/&X?  
 CBitmap*pOld=tdc.SelectObject(&bm); LXh }U>a9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); sYBmL]Hr  
 tdc.SelectObject(pOld); n@xQ-v  
 BITMAP btm; nq HpYb6I0  
 bm.GetBitmap(&btm); `YC7+`q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !u@P\8M}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |T$?vIG[  
 BITMAPINFOHEADER bih; g(9*!g  
 bih.biBitCount=btm.bmBitsPixel; uxB)dS  
 bih.biClrImportant=0; ~abyjM  
 bih.biClrUsed=0; X!K>.r_Dg  
 bih.biCompression=0; `(h^z>%  
 bih.biHeight=btm.bmHeight; nAWb9Yk  
 bih.biPlanes=1; n0T|U  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1P(=0\ P>&  
 bih.biSizeImage=size; @B (oq1i@  
 bih.biWidth=btm.bmWidth; 8T9 s:/%  
 bih.biXPelsPerMeter=0; .Y{x!Q"  
 bih.biYPelsPerMeter=0; @, GL&$Y:W  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \Q(a`6U  
 static int filecount=0; Lv]%P.=[G  
 CString name; "A"YgD#t  
 name.Format("pict%04d.bmp",filecount++); 7)V"E-6h  
 name=m_Path+name; 'I&0$<  
 BITMAPFILEHEADER bfh; F5RL+rU(h  
 bfh.bfReserved1=bfh.bfReserved2=0; T>'O[=UWh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d}zh.O5P!  
 bfh.bfSize=54+size; ^n0;Q$\  
 bfh.bfOffBits=54; <O 0Q]`i  
 CFile bf; Rlk3AWl2u  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V%s7*`U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )f|`mM4DW!  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +1YEOOfVY  
  bf.WriteHuge(lpData,size); ioD8-  
  bf.Close(); Lo1ySLo$G  
  nCount++; ;W|NG3_y  
 } 05R"/r*  
 GlobalFreePtr(lpData); myR{ }G  
 if(nCount==1) H" `'d  
  m_Number.Format("%d picture captured.",nCount); 0S$k;q  
 else dh7`eAMY   
  m_Number.Format("%d pictures captured.",nCount); +4_,, I  
  UpdateData(FALSE); =Q40]>bpx  
} \/YRhQ  
q+\<%$:u  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2I [zV7 @t  
{ ` = O  
 if(pMsg -> message == WM_KEYDOWN) `6)Qi*Z  
 { %S;AM\o4  
  if(pMsg -> wParam == VK_ESCAPE) < ,0D|O ,Y  
   return TRUE;  x)Bbo9J  
  if(pMsg -> wParam == VK_RETURN) V^ n6~O  
   return TRUE; 2P^|juc)sU  
 } s{Qae=$Q  
 return CDialog::PreTranslateMessage(pMsg); kEnGr6e  
} up'`)s'  
m%`YAD@2z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jeWv~JA%L|  
{ f(w>(1&/B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?'6@m86d  
  SaveBmp(); I?}jf?!oM  
  return FALSE; IU"  
} MGm*({%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bpwA|H%{M  
 CMenu pop; O|,9EOrP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bh1$ A  
 CMenu*pMenu=pop.GetSubMenu(0); W+#Q>^Q>  
 pMenu->SetDefaultItem(ID_EXITICON); MSQ^ovph  
 CPoint pt; XqmB%g(  
 GetCursorPos(&pt); !vAmjjB  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  Fb(@i  
 if(id==ID_EXITICON) bPxL+ +  
  DeleteIcon(); g77M5(ME  
 else if(id==ID_EXIT) 49Jnp>h  
  OnCancel(); = 0d|F 8  
 return FALSE; 8l5>t  
} 9y*] {IY  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); XeI2 <=@%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) L T$U z  
 AddIcon(); uL/wV~g  
 return res; cDY)QUmi  
} H9(?yI@Zr#  
s) ]j X  
void CCaptureDlg::AddIcon() qX-ptsQ  
{ tJ6@Ot  
 NOTIFYICONDATA data; J;>epM ;*  
 data.cbSize=sizeof(NOTIFYICONDATA); .@,t}:lD  
 CString tip; d#0:U Y%~  
 tip.LoadString(IDS_ICONTIP); /%&  d:  
 data.hIcon=GetIcon(0); dR]-R/1|  
 data.hWnd=GetSafeHwnd(); m}wn+R  
 strcpy(data.szTip,tip); T06(Q[)  
 data.uCallbackMessage=IDM_SHELL; -_ I)5*N  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D8wf`RUt  
 data.uID=98; C12UZE;  
 Shell_NotifyIcon(NIM_ADD,&data); ae sk.  
 ShowWindow(SW_HIDE); "TJu<O"2  
 bTray=TRUE; G^ W0!u,@  
} .U0Gm_c0  
X!Z)V)@J8  
void CCaptureDlg::DeleteIcon() tdH[e0x B  
{ }CBQdH&g;  
 NOTIFYICONDATA data; ?z9!=A%<V~  
 data.cbSize=sizeof(NOTIFYICONDATA); :Ph>\aG  
 data.hWnd=GetSafeHwnd(); "V>}-G&  
 data.uID=98; !#)t<9]fv  
 Shell_NotifyIcon(NIM_DELETE,&data); ]!/U9"_e"B  
 ShowWindow(SW_SHOW); 6]?%1HSi  
 SetForegroundWindow(); ~-zTY&c_  
 ShowWindow(SW_SHOWNORMAL); k\#;  
 bTray=FALSE; cuQ!"iH  
} &!CVF  
754MQK|g  
void CCaptureDlg::OnChange() WY!\^| ,  
{ g{yw&q[B=  
 RegisterHotkey(); 5)%ahmY  
} U*r54AyP  
7{F\b  
BOOL CCaptureDlg::RegisterHotkey() R!j#  
{ OZxJDg  
 UpdateData(); >)ekb7  
 UCHAR mask=0; q~R8<G%YK  
 UCHAR key=0; V8M()7uJ  
 if(m_bControl) Qfm$q~`D^W  
  mask|=4; !l $d^y345  
 if(m_bAlt) w{W+WJ  
  mask|=2; ,- AF8BP  
 if(m_bShift) Czjb.c:a.Y  
  mask|=1; s=n4'`y1  
  key=Key_Table[m_Key.GetCurSel()]; @JbxGi  
 if(bRegistered){ [ey# ,&T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); epiviCYC  
  bRegistered=FALSE; B"&-) (  
 } n= <c_a)Nb  
 cMask=mask; K<J,n!zc  
 cKey=key; U80=f2  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,j*9)  
 return bRegistered; 1VgGF^cYR  
} +\T8`iCFB  
3<^Up1CaZ  
  四、小结 r W`7<3  
'. "_TEIF  
  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