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:
p/xxoU
FHI`/ 一、实现方法
RI"A'/56 -lm\~VZT3 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:
0p_/eWww- nj~1y') #pragma data_seg("shareddata")
,\f!e#d HHOOK hHook =NULL; //钩子句柄
`Q*L!/K+ UINT nHookCount =0; //挂接的程序数目
nmVL%66K static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
;K0kQ<y-Y static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
W@1Nit-R static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?*a:f"vQ static int KeyCount =0;
@U(D&_H,K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
C-$S]6 #pragma data_seg()
1
{dhGX ajW[}/) 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。
_.OajE\T ^'~+ w3M@ 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:
}}v;V*_V _rK}~y=0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
b&Qj`j4]ZM cKey,UCHAR cMask)
jnX9] PkJ {
!~cTe!T BOOL bAdded=FALSE;
XFPWW , for(int index=0;index<MAX_KEY;index++){
DGTSk9iK( if(hCallWnd[index]==0){
Dg4?,{c9W hCallWnd[index]=hWnd;
rm NqS+t HotKey[index]=cKey;
pUWj,&t HotKeyMask[index]=cMask;
2`Xy}9N/Y bAdded=TRUE;
z)r)w?A KeyCount++;
HP2]b?C break;
#m6 eG&a }
#n7uw }
"EQ-`b=I4 return bAdded;
X 6/k `J }
"8aw=3A //删除热键
iNgHx[*? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[:
X {
*BT-@V.4 BOOL bRemoved=FALSE;
o jzO?z for(int index=0;index<MAX_KEY;index++){
2![.Kbqa% if(hCallWnd[index]==hWnd){
AW4N#gt8', if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
'c\zWmAZ hCallWnd[index]=NULL;
wGE:U` HotKey[index]=0;
Aq}]{gfQ1 HotKeyMask[index]=0;
_mKO4Atw bRemoved=TRUE;
n0kBLn KeyCount--;
-82Rz break;
zo&'2I }
[ottUS@ }
&)O X*y }
H3}{]&a return bRemoved;
](4V3w. }
HiEXw}Hkz |0ahvsrtW LZV DLL中的钩子函数如下:
X~GnK>R [>Kkj;* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
]FvN*@lG {
[nxjPx9- BOOL bProcessed=FALSE;
SEF/D0 if(HC_ACTION==nCode)
W\o(f W {
eP$0TDZ if((lParam&0xc0000000)==0xc0000000){// 有键松开
eXWiTi@ switch(wParam)
_) 2fXG! {
l=[<gPE case VK_MENU:
_=XzQZT!L MaskBits&=~ALTBIT;
h*{{_3, break;
0m6Vf
x case VK_CONTROL:
Ps(3X@ MaskBits&=~CTRLBIT;
a -,!K break;
!-%i" a case VK_SHIFT:
+Cl(:kfYB MaskBits&=~SHIFTBIT;
ZkkXITQkPM break;
@kn0f` default: //judge the key and send message
5zX;/n~ break;
/i$E |[ }
IY?[ 0S for(int index=0;index<MAX_KEY;index++){
gR"'|c if(hCallWnd[index]==NULL)
bWo-(
qxq continue;
a;D{P`%n if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~sshhuF {
Glcl7f"<^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&xMR{: bProcessed=TRUE;
={-\)j }
R3<>]/1p|P }
c 's=>-X }
~cVFCM else if((lParam&0xc000ffff)==1){ //有键按下
2j`x^ switch(wParam)
4:=']C {
h}i
/u case VK_MENU:
Pfu2=2Ra MaskBits|=ALTBIT;
}x`W+r break;
K?,eIZ{.S case VK_CONTROL:
g8
,V( ^ MaskBits|=CTRLBIT;
2?58=i%b break;
tzJdUZJ case VK_SHIFT:
Q\ TawRK8 MaskBits|=SHIFTBIT;
}BS.OK? break;
%*lOzC default: //judge the key and send message
t&^9o$ break;
]tL9 y< }
X"YH49? for(int index=0;index<MAX_KEY;index++){
R:P'QM if(hCallWnd[index]==NULL)
*x2+sgSf_0 continue;
kG/:fP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ifl`QZp_ {
\dTX%<5D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
lcHwKd bProcessed=TRUE;
FA<|V!a }
R<@s]xX_ }
N|Xx#/ }
k{(R.gLZG if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
os|8/[gT for(int index=0;index<MAX_KEY;index++){
"qjkwf)\ if(hCallWnd[index]==NULL)
at]=SA continue;
W'u6F-$2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
P%
_cIR SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:jB~rhZ~ //lParam的意义可看MSDN中WM_KEYDOWN部分
Ikql }
:oYu+cQ }
n~l9`4wJY }
q%%8oaEI return CallNextHookEx( hHook, nCode, wParam, lParam );
A(2_hl- }
0]?} kY i,1=5@rw5 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:
2W:R{dHE lxx)l(& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x7)j?2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<|[G=GA\S! 5drc8_fZ 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:
@H2c77% DW&%"$2 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
CRf !tsj@ {
A(G%9'T if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
hJ$o+sl {
!|;^ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
6MQ+![fN SaveBmp();
j h0``{ return FALSE;
l{ja2brX }
6&_"dg" …… //其它处理及默认处理
q&OF?z7H }
u+%Ca,6 EITA[Ba B` H6%QM}t 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。
b9Jah 8}z]B^?Fy 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。
yH5^EY7rQ ms2y[b 二、编程步骤
=&G<^7 e f8_w6i 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";
P,U$
X+ ([SrIG> X 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
\^a(B{ 07 [%RG 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;
i3#To}g5V idW= 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;
F5la:0fb !=%0 5、 添加代码,编译运行程序。
q)vdDdRe_ 4j^-n_T 三、程序代码
4.il4Qqy}i DT *'r; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
4Gz5Ju #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
?}|l ) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
7R9.g6j #if _MSC_VER > 1000
qNb|6/DG #pragma once
kHLpa/A #endif // _MSC_VER > 1000
vM )2F #ifndef __AFXWIN_H__
p|fSPSz #error include 'stdafx.h' before including this file for PCH
!lxs1!: #endif
8>^(-ca_ #include "resource.h" // main symbols
C><]o class CHookApp : public CWinApp
-(*<2Hy4 {
eS)2#= public:
{p3VHd# CHookApp();
0kC}qru' // Overrides
J|4q9$ // ClassWizard generated virtual function overrides
Sc!]M 5 //{{AFX_VIRTUAL(CHookApp)
]gHxvT\E public:
_
nFsC virtual BOOL InitInstance();
\i1>/`F virtual int ExitInstance();
}xhat,9 //}}AFX_VIRTUAL
5'iJN$7 //{{AFX_MSG(CHookApp)
E.~; // NOTE - the ClassWizard will add and remove member functions here.
a (Q4*XH4 // DO NOT EDIT what you see in these blocks of generated code !
=2+';Xk\ //}}AFX_MSG
)D_ZZPq_ DECLARE_MESSAGE_MAP()
1$S;#9PQ };
WOqAVd\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
~{69&T}9 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vn
oI.;H, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
dLA'cQId BOOL InitHotkey();
hv "
'DP BOOL UnInit();
2K >tI9); #endif
F:$Dz?F0v %1f, 8BM //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[t)omPy<c #include "stdafx.h"
W5'07N^ #include "hook.h"
iV+'p->/ #include <windowsx.h>
IX/FKSuq #ifdef _DEBUG
$BIQ#T>qK #define new DEBUG_NEW
D2hEI2S #undef THIS_FILE
<eWGvIEP[ static char THIS_FILE[] = __FILE__;
$xx5+A%, #endif
g~q+a- #define MAX_KEY 100
DGfhS` X #define CTRLBIT 0x04
*qx<bY@F #define ALTBIT 0x02
*Nfn6lVB #define SHIFTBIT 0x01
\Xy]z #pragma data_seg("shareddata")
z^(6>U
? HHOOK hHook =NULL;
?gZJ v UINT nHookCount =0;
}qf9ra static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Zmx[u_NG static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!: e0cV static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
dU!`aPL? static int KeyCount =0;
9`[#4'1Mik static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
,p(4OZz5, #pragma data_seg()
sU7>q}! HINSTANCE hins;
m>po+7"b void VerifyWindow();
9ICC2%j| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
#3uBq(-Z //{{AFX_MSG_MAP(CHookApp)
,!`94{Ggv // NOTE - the ClassWizard will add and remove mapping macros here.
R'E8>ee;^ // DO NOT EDIT what you see in these blocks of generated code!
"|1MJuY_6 //}}AFX_MSG_MAP
$D,m o2I END_MESSAGE_MAP()
9&'I?D&8 zs +[Aco) CHookApp::CHookApp()
apW0(&\ {
6r"PtHr // TODO: add construction code here,
rWN#QL()* // Place all significant initialization in InitInstance
A<6V$e$:2 }
H>AzxhX[n 8ad!. CHookApp theApp;
dhW; | LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FV[6">;g {
Dl862$_Q BOOL bProcessed=FALSE;
nMU#g])y) if(HC_ACTION==nCode)
WY@x2bBi {
9"yBO` if((lParam&0xc0000000)==0xc0000000){// Key up
=k4yWC5- switch(wParam)
C,C=W]G {
DdI7%?hK case VK_MENU:
Z_%}pe39B MaskBits&=~ALTBIT;
DSwF
} break;
?FRR"; case VK_CONTROL:
tVx.J'"Y MaskBits&=~CTRLBIT;
T7;)HFGeW break;
M
mg#Vy~ case VK_SHIFT:
D\Y)E#%, MaskBits&=~SHIFTBIT;
!$q1m@K1 break;
?Y"bt^4j default: //judge the key and send message
d}f| HOFq break;
]{9oB-;, }
`Tzqvnn for(int index=0;index<MAX_KEY;index++){
vOYcS$,^X% if(hCallWnd[index]==NULL)
B0c} 5V continue;
Ow\9vf6H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>l$vu-k)~4 {
@4:cn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
p71%-nV bProcessed=TRUE;
?o0#h }
dRZor gar }
< %Qw
dEO }
> qA5 else if((lParam&0xc000ffff)==1){ //Key down
da@y*TO#i switch(wParam)
1{ #Xa= {
!2x"'o case VK_MENU:
|-7<?aw" MaskBits|=ALTBIT;
GS{:7%=j break;
6RZ[X[R[} case VK_CONTROL:
x7e MaskBits|=CTRLBIT;
D} 0>x~ break;
^v3+w"2 case VK_SHIFT:
Y51XpcXQ MaskBits|=SHIFTBIT;
f5a%/1? break;
0:G@a&Lr default: //judge the key and send message
1at$_\{.( break;
gb:Cc,F,% }
Fga9 for(int index=0;index<MAX_KEY;index++)
@{_PO{=\C {
yZ:|wxVY if(hCallWnd[index]==NULL)
w8%yX$< continue;
F *;
+-e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'$)Wp_ {
|xzqYu?o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
+!POKr bProcessed=TRUE;
$2BRi@ }
EpGe'S }
[[D}vL8d }
ZNB*Azi if(!bProcessed){
9BANCW" for(int index=0;index<MAX_KEY;index++){
HkvCQ H if(hCallWnd[index]==NULL)
c7\bA7. continue;
!U`T;\,v5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p)ZlQ.d#Y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?l,i(I }
+bm2vIh$ }
hZlajky }
^
+{ ~
^y7 return CallNextHookEx( hHook, nCode, wParam, lParam );
7\ff=L-b }
}VR&*UJE M
_U$I7 BOOL InitHotkey()
-lL*WA` {
dab>@z4 if(hHook!=NULL){
QBto$!}) nHookCount++;
3|:uIoR{
return TRUE;
Op3 IL/ }
|ry;'[* else
|0f\>X I hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
qw87B!D if(hHook!=NULL)
O8u"Y0$*w nHookCount++;
s*k"-5 return (hHook!=NULL);
\g4\a?i }
k9 *0xukJ BOOL UnInit()
|r-<t {
=X&h5;x' if(nHookCount>1){
`?JrC3 nHookCount--;
#<'/sqL return TRUE;
N83RsL "}_ }
N#.IpY'7Ze BOOL unhooked = UnhookWindowsHookEx(hHook);
`ss]\46> if(unhooked==TRUE){
NkO$
M nHookCount=0;
s*9tWSd hHook=NULL;
<i`EP/x }
c<&+[{| return unhooked;
f `Wfw3 }
/HzhgMV3 nBiSc* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0^ (.(: {
3SIB #"9 BOOL bAdded=FALSE;
q=?"0i&V for(int index=0;index<MAX_KEY;index++){
6C]!>i}U if(hCallWnd[index]==0){
Zl,K# hCallWnd[index]=hWnd;
OD1ns HotKey[index]=cKey;
r)j#Skh]. HotKeyMask[index]=cMask;
qE,%$0g bAdded=TRUE;
O1#rCFC|y KeyCount++;
hChM hc break;
;
wHuL\ }
[ z$J }
La9@h" return bAdded;
3al5Vu2: }
*fd` .} E"G._<3J8 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?tA-`\E {
r kD4}jV BOOL bRemoved=FALSE;
u|:VQzPd- for(int index=0;index<MAX_KEY;index++){
#kb(2Td if(hCallWnd[index]==hWnd){
!-MG"\#Wq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SbI,9< hCallWnd[index]=NULL;
S?3{G@!
HotKey[index]=0;
k6Tpaf^ HotKeyMask[index]=0;
!m(6/*PAl bRemoved=TRUE;
q6G([h7 KeyCount--;
4x C0Aw break;
*E.
2R{ }
e@,L~\ }
Fk9(FOFg }
Mvcl9 return bRemoved;
F 1zc4l6 }
9MYt4 (/KF;J^M void VerifyWindow()
&0C!P=-p {
i{e<kKh for(int i=0;i<MAX_KEY;i++){
(Iq\+@xE= if(hCallWnd
!=NULL){ 33;|52$
if(!IsWindow(hCallWnd)){ 1b!l+ 8!
hCallWnd=NULL; sIy$}_
HotKey=0; {
o;0Fx
HotKeyMask=0; ih;TQ!c+b
KeyCount--; x)U;
} (CV=0{]
} R;.WOies4
} -"nYCF
} G7=8*@q>:
a #0{tZd
BOOL CHookApp::InitInstance() h n]6he
{ '{u#:TTj
AFX_MANAGE_STATE(AfxGetStaticModuleState()); kg@J.
hins=AfxGetInstanceHandle(); :|A db\b
InitHotkey(); e.kt]l
return CWinApp::InitInstance(); jXDo!a|4y
} 2bC%P})m
PJ.jgN(r
int CHookApp::ExitInstance() pxC5a i
{ a|53E<5X
VerifyWindow(); r 1a{Y8?
UnInit(); j,-7J*A~
return CWinApp::ExitInstance(); F>Oh)VL,Ev
} e/3hb)#;
$.cGRz
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |S}*M<0
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gjWH
}(K
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a[!d)Y:zx
#if _MSC_VER > 1000 ;7A,'y4f
#pragma once "O
'I
#endif // _MSC_VER > 1000 ;C<A}
n)H0;25L
class CCaptureDlg : public CDialog )K6{_~Kc\
{ '[E_7$d
// Construction xr2:bu
public: M*HG4(n0
BOOL bTray; !Ch ya
BOOL bRegistered; e_;6UZ+
BOOL RegisterHotkey(); igL^k`&5^"
UCHAR cKey; Lgfr"{C
UCHAR cMask; srkOad
void DeleteIcon(); <KA@A}
void AddIcon(); Qw-qcG
UINT nCount; Dw[Q,SE
void SaveBmp(); qTGy\i
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ZSSgc0u^?
// Dialog Data ?yb{DZ46
//{{AFX_DATA(CCaptureDlg) 5`DH\VD.j
enum { IDD = IDD_CAPTURE_DIALOG }; zK92:+^C
CComboBox m_Key; BkeP?X
BOOL m_bControl; F"C Yrt
BOOL m_bAlt; B;Z^.3
BOOL m_bShift; f5-={lUlIS
CString m_Path; 7EXmmB~>,
CString m_Number; (Vv]:Y]
//}}AFX_DATA Ei<:=6EX?8
// ClassWizard generated virtual function overrides *S4P'JSY
//{{AFX_VIRTUAL(CCaptureDlg) &$Lm95
public: iT"Itz-^#
virtual BOOL PreTranslateMessage(MSG* pMsg); *)1z-rH`
protected: Qa%SvA@R
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (jG$M= q-
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J_@4J7
//}}AFX_VIRTUAL M2S|$6t:
// Implementation yw<xv-Q=i
protected: D=vq<X'
HICON m_hIcon; MO/N*4U2
// Generated message map functions n}?G!ySg
//{{AFX_MSG(CCaptureDlg) 7A6sSfPUy
virtual BOOL OnInitDialog(); -*2X YTe
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); LNE[c
afx_msg void OnPaint(); ||HIp9(3
afx_msg HCURSOR OnQueryDragIcon(); (I.`bR
virtual void OnCancel(); >>Di
afx_msg void OnAbout(); mK-:laIL"
afx_msg void OnBrowse(); Hv\*F51p=
afx_msg void OnChange(); Y ckbc6F
//}}AFX_MSG <k6xScy$}
DECLARE_MESSAGE_MAP() ]IV;>94[
}; O :^[4$~
#endif &/F[kAy
R2`g?5v
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (^9M9+L[i
#include "stdafx.h" ;I'/.gW;{
#include "Capture.h" nL!@#{z
#include "CaptureDlg.h" Q^rW^d
#include <windowsx.h> }C1wfZ~F~
#pragma comment(lib,"hook.lib") 88j
;7
#ifdef _DEBUG CK</2 w+
#define new DEBUG_NEW 2A|6o*s"
#undef THIS_FILE uyj*v]AE'
static char THIS_FILE[] = __FILE__; }0RFo96)v
#endif rg}kxvu
#define IDM_SHELL WM_USER+1 a6E"
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
qS|VUy4
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gj^]}6-P
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; NN'<-0~
class CAboutDlg : public CDialog auW]rwY
{ O$/swwB!
public: I+t38un%
CAboutDlg(); z:5ROlk0
// Dialog Data G{~p.?f:
//{{AFX_DATA(CAboutDlg) ooSd6;'
enum { IDD = IDD_ABOUTBOX }; Dt.Wb&V_w
//}}AFX_DATA /nFw
// ClassWizard generated virtual function overrides %
cdP*
//{{AFX_VIRTUAL(CAboutDlg) VH6|(=8
protected: <1BK5%?
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o7XRa]O
//}}AFX_VIRTUAL #UD
// Implementation DG?\6Zh
protected: vP?S0>gh
//{{AFX_MSG(CAboutDlg) YO0x68
//}}AFX_MSG Ue:T3jp3%
DECLARE_MESSAGE_MAP() )`7+o9&
}; eb@Lh!
z{L;)U B^
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zEfD{I
{ m0\}Cc
//{{AFX_DATA_INIT(CAboutDlg) F@bCm+z-
//}}AFX_DATA_INIT K<JP9t6Qd
} |qDfFGYf
QvN
<uxm
void CAboutDlg::DoDataExchange(CDataExchange* pDX) L0 2~FT
{ 7=A9E]:
CDialog::DoDataExchange(pDX); {Y%=/ba W
//{{AFX_DATA_MAP(CAboutDlg) c[lob{,
//}}AFX_DATA_MAP Ki6.'#%7
} NV4W2thYo
>%dAqYi $
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'a?.X _t
//{{AFX_MSG_MAP(CAboutDlg) $ow`)?sh
// No message handlers F)kLlsp
//}}AFX_MSG_MAP <9tG_
END_MESSAGE_MAP() vXQmEIm
'TsZuZW]
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H)aC'M^
: CDialog(CCaptureDlg::IDD, pParent) @zF:{=+]+
{ u!k<sd_8B
//{{AFX_DATA_INIT(CCaptureDlg) uN3J)@;_
m_bControl = FALSE; `1<3Hu_
m_bAlt = FALSE; ,ri--<
m_bShift = FALSE; -L?%
o_
m_Path = _T("c:\\"); %P,^}h7
m_Number = _T("0 picture captured."); 4$GRCq5N;
nCount=0; [<a%\:c m4
bRegistered=FALSE; >/kG5]zxY
bTray=FALSE; 59BHGvaF
//}}AFX_DATA_INIT .r%|RWs6W
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :gaeb8`t
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); '/gwC7*-&
} hcc-J)=m
Yf)|ws?!
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <?7,`P:h[
{ V^/^OR4k
CDialog::DoDataExchange(pDX); gJ8 c]2c
//{{AFX_DATA_MAP(CCaptureDlg) D)7$M]d%
DDX_Control(pDX, IDC_KEY, m_Key); 0QH3,Ps1C
DDX_Check(pDX, IDC_CONTROL, m_bControl); MXJ9,U{<C'
DDX_Check(pDX, IDC_ALT, m_bAlt); P^m 6di
DDX_Check(pDX, IDC_SHIFT, m_bShift); )r,R!8
DDX_Text(pDX, IDC_PATH, m_Path); &~A*(+S
DDX_Text(pDX, IDC_NUMBER, m_Number);
C|;Mhe'r=
//}}AFX_DATA_MAP FDs^S)B
} jTUf4&b-
$RNUr
\9A
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a{Hb7&
//{{AFX_MSG_MAP(CCaptureDlg) IetGg{h.
ON_WM_SYSCOMMAND() %R*vSRG/U
ON_WM_PAINT() 9Y@?xn.\
ON_WM_QUERYDRAGICON() lF"(|n"R
ON_BN_CLICKED(ID_ABOUT, OnAbout) ~nc([%!=
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )'dH}3Ba
ON_BN_CLICKED(ID_CHANGE, OnChange)
R{KIkv
//}}AFX_MSG_MAP )^>XZ*eK
END_MESSAGE_MAP() 9f%y)[ \
O0(Q0Ko
BOOL CCaptureDlg::OnInitDialog() F@'rP++4
{
{%~4RZA
CDialog::OnInitDialog(); C
3XZD4.2
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #Q7x:,f
ASSERT(IDM_ABOUTBOX < 0xF000); "~2#!bK7
CMenu* pSysMenu = GetSystemMenu(FALSE); 5~%,u2
if (pSysMenu != NULL) A1t~&?
{ p vQK6r
CString strAboutMenu; >g"M.gW
strAboutMenu.LoadString(IDS_ABOUTBOX); [gns8F#H\
if (!strAboutMenu.IsEmpty()) Y0fO.k#C^
{ $gl<{{
pSysMenu->AppendMenu(MF_SEPARATOR); $#ju?B~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); SP?U@w%}
} chMc(.cN0
} fDEu%fUYZ
SetIcon(m_hIcon, TRUE); // Set big icon }Wche/g`
SetIcon(m_hIcon, FALSE); // Set small icon 3)c
K*8#
m_Key.SetCurSel(0); PWN'.HQ
RegisterHotkey(); ;,vL
CMenu* pMenu=GetSystemMenu(FALSE); P9TBQW2G{
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^0tf1pV2
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L8]{B
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1H,tP|s
return TRUE; // return TRUE unless you set the focus to a control TFYT vUn
} G!VF*yW8
u!3]RGJ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) K7xWE,y
{ 6^IqSNn-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'Ywpdzz[
{ {29S`-|P
CAboutDlg dlgAbout; #DK3p0d
dlgAbout.DoModal(); waWKpk1Wo
} ^g-t#O lD?
else zIm_7\e
{
c(V=.+J
CDialog::OnSysCommand(nID, lParam); y-\A@jJC5
} <k\H`P
} c6Aut`dK
"ryk\}*<
void CCaptureDlg::OnPaint() ^L-w(r62<
{ r2GK_$vd
if (IsIconic()) r -q3+c^+
{ iA3>X-x
CPaintDC dc(this); // device context for painting d=Df.H+3
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jWK@NXMH
// Center icon in client rectangle ?cs]#6^
int cxIcon = GetSystemMetrics(SM_CXICON); +fd@K
int cyIcon = GetSystemMetrics(SM_CYICON); K%(XgXb(</
CRect rect;
GKyG
#Fl
GetClientRect(&rect); T~o{woq}g
int x = (rect.Width() - cxIcon + 1) / 2; qQxA@kdd
int y = (rect.Height() - cyIcon + 1) / 2; V@_-H
gg
// Draw the icon (e8G
(
dc.DrawIcon(x, y, m_hIcon); ]Q4PbW
} WfDX"rA
else M,t*nG
{ C3\E.u?
CDialog::OnPaint(); % nmY:}um
} [l':G ]
} y5/'!L)g
^6aS]t
HCURSOR CCaptureDlg::OnQueryDragIcon() *K,hrpYR
{
$' (QTEM
return (HCURSOR) m_hIcon; ) Kc%8hBv
} 'cAc{\)
.;HIEj zq
void CCaptureDlg::OnCancel() Cl6m$YUt
{ B+Y5b5+wOQ
if(bTray) Z%+BWS3YqY
DeleteIcon(); C1T=O
CDialog::OnCancel(); a4T~\\,dZ>
} ?AnjD8i
BeI;#m0
void CCaptureDlg::OnAbout() N~):c2Kp<9
{ ss`P QN
CAboutDlg dlg; \6lh `U
dlg.DoModal(); xEVLE,*?>
} JvfQib
oe!:|ck<
void CCaptureDlg::OnBrowse() {4:
-0itG
{ fimb]C I|x
CString str; 4O`6h)!NQ
BROWSEINFO bi; l801`~*gO
char name[MAX_PATH]; cGE=.
ZeroMemory(&bi,sizeof(BROWSEINFO)); Z6Nj<2u2
bi.hwndOwner=GetSafeHwnd();
(A29ZH
bi.pszDisplayName=name; -!J2x8Ri
bi.lpszTitle="Select folder"; W}XYmF*_?
bi.ulFlags=BIF_RETURNONLYFSDIRS; Bf5&}2u
LPITEMIDLIST idl=SHBrowseForFolder(&bi); b4Cfd?'
if(idl==NULL) d/B'[Ur
return; _)KY
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); dh^+l;!L
str.ReleaseBuffer(); IV{FH&t^T"
m_Path=str; [dj5$l|
if(str.GetAt(str.GetLength()-1)!='\\') u R\m`
m_Path+="\\"; PMgQxM*h
UpdateData(FALSE); IS[Vap:
} Mlv<r=E
)?w&oIj5
void CCaptureDlg::SaveBmp() g.x=pt
{ 2yN%~C?$
CDC dc; 2wx!Lpr<i_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); P</s)"@
CBitmap bm; _+twqi
int Width=GetSystemMetrics(SM_CXSCREEN); 60GFVF]'2
int Height=GetSystemMetrics(SM_CYSCREEN); {~"7vkc+
bm.CreateCompatibleBitmap(&dc,Width,Height); G HD^%)T5^
CDC tdc; d/XlV]#2x\
tdc.CreateCompatibleDC(&dc); A7k'K4
CBitmap*pOld=tdc.SelectObject(&bm); r^$\t0h(U8
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6hkkNXqkf
tdc.SelectObject(pOld); [N)#/6j
BITMAP btm; oi2J:Y4
bm.GetBitmap(&btm); 2Co@+I[,4&
DWORD size=btm.bmWidthBytes*btm.bmHeight; j2|XDOf
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E:
9o;JU
BITMAPINFOHEADER bih; %
f2<U;ff
bih.biBitCount=btm.bmBitsPixel; iQt!PMF.
bih.biClrImportant=0; b5AGk
bih.biClrUsed=0; F:%^&%\
bih.biCompression=0; M
h`CP
bih.biHeight=btm.bmHeight; k$C"xg2
bih.biPlanes=1; - $U@By<SJ
bih.biSize=sizeof(BITMAPINFOHEADER); u]HS(B,ht
bih.biSizeImage=size; mZwi7s&u
bih.biWidth=btm.bmWidth; W*k`
bih.biXPelsPerMeter=0; Ko#4z%Yq
bih.biYPelsPerMeter=0; z!fdx|PUX
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u(W^Nou/+
static int filecount=0; c~P)4(udT
CString name; W_^>MLq
name.Format("pict%04d.bmp",filecount++); ajW[eyX
name=m_Path+name; nV'3sUvR#
BITMAPFILEHEADER bfh; [#p&D~Du&
bfh.bfReserved1=bfh.bfReserved2=0; Bi]D{m9
bfh.bfType=((WORD)('M'<< 8)|'B'); ~}BJ0P(VMc
bfh.bfSize=54+size; _=ugxL #eB
bfh.bfOffBits=54; UL+E,=
CFile bf; Bwjg#1 E
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $^t<9"t
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,Ij=b
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #wF1
bf.WriteHuge(lpData,size);
n
]w7Zj
bf.Close(); )S^z+3p
nCount++; Q6=MS>JW]w
} Y2<dM/b/
GlobalFreePtr(lpData); 3[VWTq)D=
if(nCount==1) [*<.?9n)or
m_Number.Format("%d picture captured.",nCount); (vKI1^,
else ! ,@ZQS
m_Number.Format("%d pictures captured.",nCount); UxyY<H~Wx
UpdateData(FALSE); dY8(nQG
} _R)&k%i}
Z|
We9%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =yo{[&Jz
{ MSl&?}Bj
if(pMsg -> message == WM_KEYDOWN) `\!X}xiWd
{ [OzzL\)3l
if(pMsg -> wParam == VK_ESCAPE) 9qpU@V!
return TRUE; !#?8BwnaZ
if(pMsg -> wParam == VK_RETURN) O}QFq14<+
return TRUE; 6*Zj]is
} ! a o6e
return CDialog::PreTranslateMessage(pMsg); ~ FGe~
} D}w<84qX
n12UBvc}%
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a5a1'IVq
{ 7,*%[#-HE
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >V(zJ
SaveBmp(); |Ab{H%
return FALSE; ibXe"X/_
} j eq:
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ RX'-99M
CMenu pop; ~b Rd)1
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [(|^O>k8c
CMenu*pMenu=pop.GetSubMenu(0); qIh #~
pMenu->SetDefaultItem(ID_EXITICON); GB>aT-G7q
CPoint pt; Gg|M+M?+
GetCursorPos(&pt); lyyX<=E{)
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^_68]l=
if(id==ID_EXITICON) O+_N!/
DeleteIcon(); ZHCr2^w6
else if(id==ID_EXIT) Q[uAIyv0
OnCancel(); Ea4_Qmn
return FALSE; If;R?j0;Q
} 4O(@'#LLz
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r,4lqar;E
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) OEnDsIhq
AddIcon(); W5.Va.
return res; dAL3. %
} cD2+hp|9
&Yf",KcL*I
void CCaptureDlg::AddIcon() n_P3\Y|
{ qaG# ;
NOTIFYICONDATA data;
%H& ].47
data.cbSize=sizeof(NOTIFYICONDATA); V@%
CString tip; \gItZ}+c4}
tip.LoadString(IDS_ICONTIP); E"#Xc@
data.hIcon=GetIcon(0); .%'Z~|K4
data.hWnd=GetSafeHwnd(); 4PWAGuN^
strcpy(data.szTip,tip); @A{m5h
data.uCallbackMessage=IDM_SHELL; j)Y[4 ^k^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gRAC d&)
data.uID=98; ` H
XEZ|
Shell_NotifyIcon(NIM_ADD,&data); e3v5,.
ShowWindow(SW_HIDE); vc8?I."?
bTray=TRUE; ong""K4H
} 3?.1nGu
s]H^wrg&
void CCaptureDlg::DeleteIcon() xx }GOY.J
{ G 4qy*.
NOTIFYICONDATA data; fxgU~'
data.cbSize=sizeof(NOTIFYICONDATA); \G>ZkgU
data.hWnd=GetSafeHwnd(); iY~rne"l
data.uID=98; O4L#jBa+
Shell_NotifyIcon(NIM_DELETE,&data); {U"^UuU]
ShowWindow(SW_SHOW); ]Bnwk
o
SetForegroundWindow(); ,a0pAj
ShowWindow(SW_SHOWNORMAL); ;Lo&}U3F,!
bTray=FALSE; HI`q1m.
} dlD ki.
ufrqsv]=
void CCaptureDlg::OnChange() Bu3T/m
{ KKEN'-3
RegisterHotkey(); ^aF8wbuZ
} \?Mf _
[h&BAR/ 2
BOOL CCaptureDlg::RegisterHotkey() c*;7yh&%
{ c0ez/q1S
UpdateData(); v+=k-;-
UCHAR mask=0; <&<,l58[c
UCHAR key=0; [ohBPQO
if(m_bControl) \.#p_U5In
mask|=4; A&,,9G<
if(m_bAlt) ]|U-y645
mask|=2; ECcZz.
if(m_bShift) l&W;b6L
mask|=1; bk<FL6z
z
key=Key_Table[m_Key.GetCurSel()]; KrcgIB8X
if(bRegistered){ A6{b?aQ
DeleteHotkey(GetSafeHwnd(),cKey,cMask); B= X,7
bRegistered=FALSE; V&ot3- Rf
} C$9z
cMask=mask; fD4ICO @
cKey=key; !kL> ,O>/
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); * R d#{Io7
return bRegistered; 2p!"p`b~
} zhblLBpeE\
JObMZA$
四、小结 }BJX/, H,
X!tf#tl
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。