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:
n`;R pr&
i`OrMzL 一、实现方法
qU[O1bN }o9Aa0$*$ 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:
]9S`[c$ S C_|A9 #pragma data_seg("shareddata")
Ca $c; HHOOK hHook =NULL; //钩子句柄
RwTzz]
M UINT nHookCount =0; //挂接的程序数目
X^@[G8v% static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
qA/bg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
^i:\@VA: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
]R_G{% static int KeyCount =0;
ev>oC~>s static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
{sC=J hs- #pragma data_seg()
0d\~"4 R f3
] 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。
rvwy~hO" M>_ = "atI 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:
-0,4egj3 +EAS Aq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
mPVE?jnR^0 cKey,UCHAR cMask)
".2A9]_s {
?|t/mo|K? BOOL bAdded=FALSE;
-'C!"\% for(int index=0;index<MAX_KEY;index++){
9|!j4DS< if(hCallWnd[index]==0){
}&G]0hCT! hCallWnd[index]=hWnd;
IvW@o1Q HotKey[index]=cKey;
g<[rH%\6fg HotKeyMask[index]=cMask;
5 z]\$=TE bAdded=TRUE;
$ehg@WK}. KeyCount++;
v29G:YQe break;
Ud3""C5B }
GH3#E*t+[ }
Qp!Y.YnPd_ return bAdded;
*PM}"s }
H|+tC=]4IZ //删除热键
5iWe-xQ> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4-:7.I(hq {
=p\Xy* BOOL bRemoved=FALSE;
,sb1"^Wc for(int index=0;index<MAX_KEY;index++){
6d{j0?mM if(hCallWnd[index]==hWnd){
?TuI:dC if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
P&t;WPZ hCallWnd[index]=NULL;
GFR!n1Hv HotKey[index]=0;
u;n(+8sz HotKeyMask[index]=0;
qiNliJ>40E bRemoved=TRUE;
\mXqak,y KeyCount--;
}h~'AM break;
~5t?C<wo }
xtJAMo>g }
_IYY08&(r }
A'DVJ9%xB return bRemoved;
u3wL<$2[8 }
X7e/:._SAH sA_X<>vAKJ
kQ }s/* DLL中的钩子函数如下:
+?e}<#vd'? &LU'.jY LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
H%Y%fQ~^ {
dB`b9)Tk0z BOOL bProcessed=FALSE;
IH3FK!>6 if(HC_ACTION==nCode)
<-|SIF {
`)tK^[,<W if((lParam&0xc0000000)==0xc0000000){// 有键松开
<"I?jgo switch(wParam)
VC=6uB {
`$9L^Yg,4 case VK_MENU:
uJPH~mdW MaskBits&=~ALTBIT;
b|E/LKa break;
&"j@79Ym1~ case VK_CONTROL:
!P" ? MaskBits&=~CTRLBIT;
Gj`f--2GE break;
Ve14rn case VK_SHIFT:
MYTS3( MaskBits&=~SHIFTBIT;
`D)S-7BR break;
sfC@*Y2XT default: //judge the key and send message
p}8ratmN break;
WTu{,Q }
v>^jy8$ for(int index=0;index<MAX_KEY;index++){
B,0+HoP if(hCallWnd[index]==NULL)
.cw=*<zeg continue;
|Q u_E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
` Xqy {
l\U*sro< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
;qT5faKB3J bProcessed=TRUE;
`GkRmv* }
hgj0tIi/ }
T{~M iC6A }
<`mOU}0) else if((lParam&0xc000ffff)==1){ //有键按下
7z>+w switch(wParam)
L{K*~B -p {
*dVD case VK_MENU:
3YRBI|XO MaskBits|=ALTBIT;
;@'0T4Z&l break;
dMgbW<uAu case VK_CONTROL:
WH;xq^ MaskBits|=CTRLBIT;
h*l4Y!7 break;
g _x\T+= case VK_SHIFT:
XbXgU#% MaskBits|=SHIFTBIT;
*cy.*@d break;
.9I_NG default: //judge the key and send message
r1hD
%a break;
ZE ^u .>5 }
dAwS<5! for(int index=0;index<MAX_KEY;index++){
wL'C1Vr if(hCallWnd[index]==NULL)
Znq(R8BMW continue;
K*[0dza$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9T]va]w?# {
C[W5d~@;E SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
YRu%j4Tx bProcessed=TRUE;
\
>(zunL }
FP@A;/c }
@d
P~X }
Wb'*lT0= if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
1YFAr}M for(int index=0;index<MAX_KEY;index++){
DlS&qFs if(hCallWnd[index]==NULL)
Xi*SDy continue;
&{hc if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=*[, *A SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mC"7)&,F //lParam的意义可看MSDN中WM_KEYDOWN部分
9$EHK }
r)%4-XeV }
%y3:SUOdx }
XNK
43fkB. return CallNextHookEx( hHook, nCode, wParam, lParam );
e)br`CD% }
Cea"qNq=k |H<|{{E 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
*\C}Ok= }RH lYN BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
dgm+U%E BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&F86SrsI % M+s{ l 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
pV_}Or_ \4C)~T:* LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
zAu}hVcW {
6WCmp,* if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
KdS
eCeddW {
8\P
JSr //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
i:R!T, SaveBmp();
"{mt? return FALSE;
oNrEIgaA(+ }
Ep,1}Dx …… //其它处理及默认处理
%pd5w~VP }
?#U0eb5u `$f\ % %d ZM9I0 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。
JPHUmv6 E#8J+7 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。
.!!79 6hS q^u6f?B 二、编程步骤
z{@=_5; A"`L~|& 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";
%~ ;nlDw kA1f[AL 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,7QBJ_-;QJ Xk
5oybDI 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;
@_G` Ok4 B<rPvM7a 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;
rrW! X q !Jh*a *I} 5、 添加代码,编译运行程序。
'et(:}i q`h7H][(A 三、程序代码
u;$I{b@M] #^"hqNwA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
DI L)7K4 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
D[+|^,^> #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
UU*0dSWr #if _MSC_VER > 1000
tbL1g{Dz, #pragma once
X9p+a, #endif // _MSC_VER > 1000
LqMe'z #ifndef __AFXWIN_H__
"[FCQ #error include 'stdafx.h' before including this file for PCH
5ENov!$H #endif
4+BrTGp #include "resource.h" // main symbols
C+}CU} class CHookApp : public CWinApp
9)1P+c-- {
B b$S^F(Xq public:
Y}85J:q] CHookApp();
W^-hMT]uD // Overrides
Rc;1Sm9\ // ClassWizard generated virtual function overrides
]v/t8` //{{AFX_VIRTUAL(CHookApp)
39'X$! public:
&3!i@2d;3f virtual BOOL InitInstance();
"4J?JR virtual int ExitInstance();
:d, >d //}}AFX_VIRTUAL
oiIt3<BX //{{AFX_MSG(CHookApp)
-i| /JH // NOTE - the ClassWizard will add and remove member functions here.
g-4gI\ // DO NOT EDIT what you see in these blocks of generated code !
ABd153oW" //}}AFX_MSG
l#mqV@?A~ DECLARE_MESSAGE_MAP()
JDIz28 Ww };
VGq{y{( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
$IZ*|>( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s0x@
u BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_Y}^%eFw BOOL InitHotkey();
?z*W8b]' BOOL UnInit();
j 8~Gv=(h #endif
}])GQ@ O~7p^i} //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
>$d d9|[ #include "stdafx.h"
,C5@P+A #include "hook.h"
eh8<?(eK #include <windowsx.h>
@B}&62T #ifdef _DEBUG
Yb,G^+; #define new DEBUG_NEW
W\d0 #undef THIS_FILE
^XjvJa static char THIS_FILE[] = __FILE__;
#JX|S'\x #endif
;,[EJR^CI #define MAX_KEY 100
%D%e:se #define CTRLBIT 0x04
ua6*zop #define ALTBIT 0x02
XRX7qo(0g #define SHIFTBIT 0x01
/v<e$0~s< #pragma data_seg("shareddata")
h8Dtq5t4 HHOOK hHook =NULL;
d!a2[2Us UINT nHookCount =0;
BxW||O|_N" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;jpw"-J` static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
r;@:S~ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
LIm$Wl1U static int KeyCount =0;
^hGZVGSv static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
LNsE7t #pragma data_seg()
D/NIn=>j HINSTANCE hins;
ur,V>J<5A void VerifyWindow();
gK] T} BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
'Q^G6'(SaK //{{AFX_MSG_MAP(CHookApp)
4AG&z,[ // NOTE - the ClassWizard will add and remove mapping macros here.
[qc6Q: // DO NOT EDIT what you see in these blocks of generated code!
\!?
PhNv //}}AFX_MSG_MAP
dUBVp 9PB END_MESSAGE_MAP()
:$) aMEq q[We][Nrzb CHookApp::CHookApp()
2=/-d$ {
`UzCq06rJ1 // TODO: add construction code here,
M[&.kH // Place all significant initialization in InitInstance
HzFt }
ul]m>W $)WH^Ir~ CHookApp theApp;
1{Sx V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
d@`-!" {
g/J^K*3] BOOL bProcessed=FALSE;
<3J=;.\6 if(HC_ACTION==nCode)
d-_93 {
7ZR0M&pX if((lParam&0xc0000000)==0xc0000000){// Key up
rK0|9^i{ switch(wParam)
{#d`&] {
Jf8'N
ot case VK_MENU:
sIQMUC[! MaskBits&=~ALTBIT;
0Zp<=\!; break;
.*clY case VK_CONTROL:
42H#n]Y MaskBits&=~CTRLBIT;
-qr:c9\px break;
'p{Y{
$Q case VK_SHIFT:
E!oJ0*@ MaskBits&=~SHIFTBIT;
C$EFh4 break;
QjT#GvHY default: //judge the key and send message
bx'B;rZr break;
QRn:=J%W W }
0[3tW[j for(int index=0;index<MAX_KEY;index++){
Hr_x~n=w if(hCallWnd[index]==NULL)
*jqPKK/ continue;
'! 2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'j=PbA {
r]K0
]h@B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0v,`P4_k bProcessed=TRUE;
YH:W] }
`;8u9Ff }
!{|yAt9kP }
U7Sl@-#| else if((lParam&0xc000ffff)==1){ //Key down
%.r5E2' switch(wParam)
DrYoC7 {
kk>0XPk case VK_MENU:
".7KEnx MaskBits|=ALTBIT;
sC'A_ -' break;
,YuWz$aF{ case VK_CONTROL:
w{UKoU MaskBits|=CTRLBIT;
_{@}Fd?o break;
1OJD\wc case VK_SHIFT:
okW)s*7 MaskBits|=SHIFTBIT;
~wQ WWRk break;
bB[*\ default: //judge the key and send message
}j5@\c48 break;
I(r5\A= }
S4AB tKG for(int index=0;index<MAX_KEY;index++)
ZYp-dlEXq {
:/?R9JVI if(hCallWnd[index]==NULL)
.<|4PG continue;
Y$DgL
h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*1 eTf {
zz''FmedF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-V)5Tr= bProcessed=TRUE;
E EnTq }
(]#
JpQ }
s(DaPhL6Qm }
_J$p< if(!bProcessed){
6T
aT_29 for(int index=0;index<MAX_KEY;index++){
2QQYXJ^ if(hCallWnd[index]==NULL)
z 4OR
UQ continue;
-
G2M;]Cn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X<bj2 w SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;Z<*.f'^fc }
{b8 Y- }
QRc=-Wu_( }
w6%CBE2 return CallNextHookEx( hHook, nCode, wParam, lParam );
Ab|NjY: }
/Gu2@m[r )6S}O*
1 BOOL InitHotkey()
{;rpgc {
(VF4] if(hHook!=NULL){
jjlCi<9CQ^ nHookCount++;
C{Xk/Er5< return TRUE;
*d*;M> }
|"(3]f\ else
zAdVJ58H hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
J!gWRw5 if(hHook!=NULL)
-O q=J; nHookCount++;
29E@e]Y,` return (hHook!=NULL);
t~=@r9`S
}
IF21T BOOL UnInit()
oXOO 10 {
4OgGZ if(nHookCount>1){
in|7ucSlg nHookCount--;
fP4IOlHkE return TRUE;
a5g{.:NfO }
RwLdV+2\R` BOOL unhooked = UnhookWindowsHookEx(hHook);
?^A:~" ~ if(unhooked==TRUE){
,lG wW8$R nHookCount=0;
:a<TV9?H0 hHook=NULL;
%>}7$Y% }
Z["nY&.sI return unhooked;
>]N0w }
i!-sbwd7 {xx;zjt%}} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SNV+.xN {
9'r3L)[ BOOL bAdded=FALSE;
;DWp>jgy for(int index=0;index<MAX_KEY;index++){
PL2Q!i`[o if(hCallWnd[index]==0){
OX`GN#yl hCallWnd[index]=hWnd;
* =N6_ HotKey[index]=cKey;
xRZT HotKeyMask[index]=cMask;
tqk6m# @( bAdded=TRUE;
`v+O5 KeyCount++;
{Q3#]Vu break;
5m;wMW< }
u>Kvub }
m<HjL return bAdded;
!ZcALtq }
H[yLlv M L_J<|,J BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;SP3nU)) {
-]MP,P% BOOL bRemoved=FALSE;
tm#y`1- for(int index=0;index<MAX_KEY;index++){
JS.'v7 if(hCallWnd[index]==hWnd){
0-O.*Q^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2xxwQwg8 hCallWnd[index]=NULL;
\O4=mJ HotKey[index]=0;
s,q!(\{Pv HotKeyMask[index]=0;
R^C;D2 bRemoved=TRUE;
K#yH\fn8 KeyCount--;
R')GQ.yYq break;
+*~3"ww< }
87*[o }
`Wt~6D
e }
Z
' 96d return bRemoved;
Q%h
o[KU }
/{}
]Hu _Dt TG<E void VerifyWindow()
[vT,zM
{
N8Q{4c for(int i=0;i<MAX_KEY;i++){
=!Cvu.~}, if(hCallWnd
!=NULL){ ]8z6gDp
if(!IsWindow(hCallWnd)){ ' vClZGQ1
hCallWnd=NULL; mTbPzZ4
HotKey=0; LKG|S<s
HotKeyMask=0; tH!z7VZ
KeyCount--; RH 0a\RC!G
} +N!{(R:"v}
} yXmp]9$
} %'<
qhGJ
} P Qay
sdb
+u.L6GcB
BOOL CHookApp::InitInstance() I[Y?f8gJ
{ ? +!?$h
AFX_MANAGE_STATE(AfxGetStaticModuleState()); T}On:*&
hins=AfxGetInstanceHandle(); 0w&1wee(
InitHotkey(); >U.uRq
return CWinApp::InitInstance(); 8# AXK{
} PUo&>
OOwJ3I >]>
int CHookApp::ExitInstance() q+Q)IVaU81
{ ,g.=vQm:?
VerifyWindow(); Q:=/d$*xd
UnInit(); k9?+9bExXA
return CWinApp::ExitInstance(); 40ZB;j$l
} sP8B?Tn1W
^ 9E(8DD
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !(o2K!v0
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) D/>5\da+y
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ a-=apD1RvG
#if _MSC_VER > 1000 w+D5a
VJ
#pragma once |U0@(H
#endif // _MSC_VER > 1000 4\RuJx
)QT+;P.
class CCaptureDlg : public CDialog r}bKVne
{ 6U]7V
// Construction l"#,O$x"#@
public: V&85<Y%Nl|
BOOL bTray; s*Ll\#
BOOL bRegistered; ],4LvIPD
BOOL RegisterHotkey(); s| oU$?eA
UCHAR cKey; Wn5]2D\vkT
UCHAR cMask; ["9$HL
void DeleteIcon(); ('oUcDOFTS
void AddIcon(); J ASn\z
UINT nCount; C I0^eaFs
void SaveBmp(); Czn7,KE8X
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4v$AM8/o
// Dialog Data i{0_}"B
//{{AFX_DATA(CCaptureDlg) #a:C=GV;4
enum { IDD = IDD_CAPTURE_DIALOG }; 'Mtu-\
CComboBox m_Key; f{oWd]eAhb
BOOL m_bControl; 9NAlgET
BOOL m_bAlt; =7>~u
BOOL m_bShift; $x*GvI1D
CString m_Path; rY.:}D
CString m_Number; ,j<"~"]
=
//}}AFX_DATA '@P[fSQ
// ClassWizard generated virtual function overrides Ckp=d
//{{AFX_VIRTUAL(CCaptureDlg) @YELqUb*
public: p
IToy;]
virtual BOOL PreTranslateMessage(MSG* pMsg); p,/^x~m3a
protected: bHM
.&4G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b iD7(AK
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f
;JSP
//}}AFX_VIRTUAL !NtY4O/
// Implementation m~A/.t%=
protected: g(^l>niF:
HICON m_hIcon; =\.|'
// Generated message map functions w8Yff[o
//{{AFX_MSG(CCaptureDlg) :h@:F7N _
virtual BOOL OnInitDialog(); ?9cy5z[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b :00w["
afx_msg void OnPaint(); JZ
[&:
afx_msg HCURSOR OnQueryDragIcon(); L`v,:#Y
virtual void OnCancel(); q)X&S*-<o~
afx_msg void OnAbout(); QkbN2mFv%
afx_msg void OnBrowse(); !/SFEL@_B
afx_msg void OnChange(); ;iVyJZI
//}}AFX_MSG Sz&`=x#
DECLARE_MESSAGE_MAP() cA kw5}P
}; P<~y$B
#endif ikC;N5Sw
&[uGfm+@
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file CDhk!O..
#include "stdafx.h" 5o*x?P!$
#include "Capture.h" %qMk&1
#include "CaptureDlg.h" iuEdm:pW
#include <windowsx.h> ns-x\B?^
#pragma comment(lib,"hook.lib") %k_JLddlW
#ifdef _DEBUG @B6[RZ R
#define new DEBUG_NEW [sBD|P;M
#undef THIS_FILE _=b[b]Ec$s
static char THIS_FILE[] = __FILE__; w# ['{GL
#endif DWG}}vN:&
#define IDM_SHELL WM_USER+1 hpU7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0ro+FJ r
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a/1{tDA
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X9J^Olq
class CAboutDlg : public CDialog 9TLP(
{ ;_!;D#:
public: $si2H8
CAboutDlg(); QXCI+Fcg
// Dialog Data SL*(ZEn"
//{{AFX_DATA(CAboutDlg) }PVB+i M
enum { IDD = IDD_ABOUTBOX }; P<1zXs.H
//}}AFX_DATA F`l1I=;
// ClassWizard generated virtual function overrides Nf1l{N
//{{AFX_VIRTUAL(CAboutDlg) {sLh=iK
protected: uB
BE!w_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZyG528O22
//}}AFX_VIRTUAL wC19
// Implementation 3c)LBM
protected: _z;N|Xe
//{{AFX_MSG(CAboutDlg) P;GUGG*W
//}}AFX_MSG .Kx5Kh{
DECLARE_MESSAGE_MAP() 0(n/hJ
}; Xs`/q}R
dFlx6H+R!0
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YeQX13C"Z
{ &^Io\
//{{AFX_DATA_INIT(CAboutDlg) PF~&!~S>W
//}}AFX_DATA_INIT 4D8q Gti
} fqi584
:Vg,[\I{
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +J2=\YO
{ I?=Q
*og
CDialog::DoDataExchange(pDX); @S{,g;8
//{{AFX_DATA_MAP(CAboutDlg) }.#C9<"}
//}}AFX_DATA_MAP rfk';ph
} QL3%L8
#/aWGx_
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j JW0a\0
//{{AFX_MSG_MAP(CAboutDlg) x|Dj
// No message handlers |cH\w"DcXw
//}}AFX_MSG_MAP TSOt$7-
END_MESSAGE_MAP() p8Pvctc
?@ O[$9y
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) z;-2xD0&U[
: CDialog(CCaptureDlg::IDD, pParent) b|EZ;,i
{ JSM{|HJxh
//{{AFX_DATA_INIT(CCaptureDlg) ^vzNs>eJ
m_bControl = FALSE; W!{uEH{%l
m_bAlt = FALSE; &{>~|^
m_bShift = FALSE; 9T\:ID=h
m_Path = _T("c:\\"); SpkD
m_Number = _T("0 picture captured."); D,2,4h!ka
nCount=0; "|hmiMdGB
bRegistered=FALSE; 2`;
0y M
bTray=FALSE; Y!KGJ^.mF
//}}AFX_DATA_INIT b[$>HB_Na
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E0YXgQa
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l)?c3
} {w2<;YXj!
bz@4obRqf
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?O.&=im_
{ -" DI,o
CDialog::DoDataExchange(pDX); #JVcl $0Y
//{{AFX_DATA_MAP(CCaptureDlg) j0Q;OKu
DDX_Control(pDX, IDC_KEY, m_Key); yd2ouCUV
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8g<3J-7Mm
DDX_Check(pDX, IDC_ALT, m_bAlt); Es?~Dd
DDX_Check(pDX, IDC_SHIFT, m_bShift); $]O\Ryf6
DDX_Text(pDX, IDC_PATH, m_Path); :g Ze>
DDX_Text(pDX, IDC_NUMBER, m_Number); Ih.o;8PpK
//}}AFX_DATA_MAP Ji=E 1R
} VBOq~>V6(v
[Ga9^e$Zv
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _9<Ko.GVq
//{{AFX_MSG_MAP(CCaptureDlg) 3]wV`mD
ON_WM_SYSCOMMAND() c1c0b|B!U
ON_WM_PAINT() x.'O_7c0:
ON_WM_QUERYDRAGICON() oYu5]ry
ON_BN_CLICKED(ID_ABOUT, OnAbout) JMoWA0f
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /0 zk &g
ON_BN_CLICKED(ID_CHANGE, OnChange) ^K3{6}]
//}}AFX_MSG_MAP Q?vGg{>
END_MESSAGE_MAP() ifuVV Fov
8Y:bvs.j
BOOL CCaptureDlg::OnInitDialog() C6GYhG]
{ SwQb"
CDialog::OnInitDialog(); TK'(\[E
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t&ngOF
ASSERT(IDM_ABOUTBOX < 0xF000); E_FseR6
CMenu* pSysMenu = GetSystemMenu(FALSE); TN&1C8xr
if (pSysMenu != NULL) *NDzU%X8
{ U|,VH-#
CString strAboutMenu; )5hS;u&b
strAboutMenu.LoadString(IDS_ABOUTBOX); @}#$<6|
if (!strAboutMenu.IsEmpty()) m|'TPy
{
D9JT)a
pSysMenu->AppendMenu(MF_SEPARATOR); S53[K/dZo
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Nhs]U`s(g
} # *\PU
} r3#H]c
SetIcon(m_hIcon, TRUE); // Set big icon VaH#~!
SetIcon(m_hIcon, FALSE); // Set small icon Fe:0nr9;
m_Key.SetCurSel(0); ,rQznE1e
RegisterHotkey(); \ ddbqg?`
CMenu* pMenu=GetSystemMenu(FALSE); *&LVn)@[`
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Up`zVN59.
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (ZDRjBth[
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xZBmQ:s',S
return TRUE; // return TRUE unless you set the focus to a control PZQ}G*p3
} Krz[ f
NFsMc0{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <jfi"SJu
{ 2Ui)'0
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {4UlJ,Z.n
{ x2;92I{5C,
CAboutDlg dlgAbout; IS"UBJ6p
dlgAbout.DoModal(); Yk[yG;W
} 9;kWuP>k4u
else 'R= r9_%
{ -]HO8}-Rjs
CDialog::OnSysCommand(nID, lParam); <Cm:4)~
} )t0t*xu#
} jRzR`>5
.BZw7
YV
void CCaptureDlg::OnPaint() l1a=r:WhH
{ ~,.Agx
if (IsIconic()) TR|G4l?
{ %
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CPaintDC dc(this); // device context for painting BT>8
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z3=t"
// Center icon in client rectangle Es1Yx\/:
int cxIcon = GetSystemMetrics(SM_CXICON); }wz )"
int cyIcon = GetSystemMetrics(SM_CYICON); zS]Yd9;X1
CRect rect; B$aboL2
GetClientRect(&rect);
!1;DRF
int x = (rect.Width() - cxIcon + 1) / 2; J %URg=r
int y = (rect.Height() - cyIcon + 1) / 2; u
JGYXlLE
// Draw the icon }Z"<KF
dc.DrawIcon(x, y, m_hIcon); ^2XoYgv
} &H<-joZ)Z\
else `
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{ !ZHPR:k|
CDialog::OnPaint(); FX 0^I 0
}
n~k;9`
} uG~%/7Qt{
'Q?nU^:F#
HCURSOR CCaptureDlg::OnQueryDragIcon() IKH#[jW'IB
{ 5Tkh6 s
return (HCURSOR) m_hIcon; d'J))-*#UO
} qVx0VR1:
0~Z2$`(
void CCaptureDlg::OnCancel() =#SKN\4
{ YB.r-c"Y
if(bTray) ZmU S}
DeleteIcon(); 9-I;'
CDialog::OnCancel(); P*Uu)mG)G
} |&o%c/
{])F%Q_#cD
void CCaptureDlg::OnAbout() >?'cZTNk]
{ tNoo3&
CAboutDlg dlg; AS'a'x>8>,
dlg.DoModal(); +UB+. 5P
} +(QGlRd
-%NT)o
void CCaptureDlg::OnBrowse() ma?$@]`k
{ r. =_=V/t
CString str; lmgMR|v
BROWSEINFO bi; T[*=7jnJQ
char name[MAX_PATH]; X2/`EN\
ZeroMemory(&bi,sizeof(BROWSEINFO)); IX,/ZOZ|
bi.hwndOwner=GetSafeHwnd(); <$K%u?
bi.pszDisplayName=name; zH.DyD5T;
bi.lpszTitle="Select folder"; SzMh}xDh2
bi.ulFlags=BIF_RETURNONLYFSDIRS; H@.j@l
LPITEMIDLIST idl=SHBrowseForFolder(&bi); !Yz~HO,u+
if(idl==NULL) 'cu(
Sd}
return; Gmf.lHr$%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y/'2WO[
str.ReleaseBuffer(); It!PP1$
m_Path=str; >x eKO2o
if(str.GetAt(str.GetLength()-1)!='\\') &1{RuV&t
m_Path+="\\"; :I1)=8lO
UpdateData(FALSE); ?S36)oZzg
} oOnk,U
bBb$0HOF
void CCaptureDlg::SaveBmp() O
sbY}*S
{ 25NZIal<
CDC dc; h)~KD%
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Yy@;U]R
CBitmap bm; a{mtG{Wc
int Width=GetSystemMetrics(SM_CXSCREEN); VX2KE@
int Height=GetSystemMetrics(SM_CYSCREEN); %F` cNw]
bm.CreateCompatibleBitmap(&dc,Width,Height); k^:$ETW2
D
CDC tdc; ;lB%N
t<,
tdc.CreateCompatibleDC(&dc); t:9}~%~
CBitmap*pOld=tdc.SelectObject(&bm); g~S>_~WL
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eo24I0`N
tdc.SelectObject(pOld); k*\WzBTd
BITMAP btm; != _:*U)-'
bm.GetBitmap(&btm); @{:E&K1f
DWORD size=btm.bmWidthBytes*btm.bmHeight; *1$rg?yGf
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )0
.gW
BITMAPINFOHEADER bih; 6Y>MW 4q
bih.biBitCount=btm.bmBitsPixel; &&\ h%-Jc
bih.biClrImportant=0; DvKM[z3j
bih.biClrUsed=0; dw5.vXL`
bih.biCompression=0; |K YON Q
bih.biHeight=btm.bmHeight; ) ^'Q@W
bih.biPlanes=1; !;x
bih.biSize=sizeof(BITMAPINFOHEADER); T2AyQ~5~
bih.biSizeImage=size; $pyM<:*L&<
bih.biWidth=btm.bmWidth; <!v^Df
bih.biXPelsPerMeter=0; y+)][Wa0
bih.biYPelsPerMeter=0; 5hUYxF20h8
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $6Lgaz
static int filecount=0; &.y:QVR,!
CString name; BuCU_/H
name.Format("pict%04d.bmp",filecount++); MMqkNe
name=m_Path+name; ZT5t~5W
BITMAPFILEHEADER bfh; V7G?i\>
bfh.bfReserved1=bfh.bfReserved2=0; :z_D?UQ
bfh.bfType=((WORD)('M'<< 8)|'B'); EW%%W6O6
bfh.bfSize=54+size; s/Fc7V!;
bfh.bfOffBits=54; Z,M?!vK
CFile bf; ;cH|9m:Y
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W/<]mm~95
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); dE7 kd=.o
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [rC-3sGar
bf.WriteHuge(lpData,size); B;r U
bf.Close(); vvU;55-
nCount++; 8 P.t
} 17I{_C
GlobalFreePtr(lpData); @Y 1iEL%\y
if(nCount==1) R
rs?I,NV
m_Number.Format("%d picture captured.",nCount); cKEf- &~
else B.-5$4*s
m_Number.Format("%d pictures captured.",nCount); ,B(UkPGT
UpdateData(FALSE); f ?_YdVZ
} LYhgBG,
W$O^IC
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %*wJODtB|
{ H$>D_WeJ
if(pMsg -> message == WM_KEYDOWN) hZ Gr/5f
{ 6;60}y
if(pMsg -> wParam == VK_ESCAPE) <W2}^q7F^
return TRUE; }L^Yoq]
if(pMsg -> wParam == VK_RETURN) IsxPm9P2<
return TRUE; (cAv :EKpo
} +Pd&YfU9
return CDialog::PreTranslateMessage(pMsg); _A|1_^[G(
} z6#N f,
tSV}BM,
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7h?PVobe
{ 7(rTGd0
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =uQCm#
SaveBmp(); gdT3,8`#[
return FALSE; Y5&Jgn.l
} 1_%jDMYH
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .;ml[DXH
CMenu pop; "aHY]E{
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); nud,ag
CMenu*pMenu=pop.GetSubMenu(0); :0$(umW@I"
pMenu->SetDefaultItem(ID_EXITICON); Z#BwJHh
CPoint pt; _v{,vLH
GetCursorPos(&pt); 6^F"np{w
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0N$tSTo.-<
if(id==ID_EXITICON) &Y%Kr`.h
DeleteIcon(); "%dWBvuO
else if(id==ID_EXIT) \j !JRD+j
OnCancel(); %Rj:r!XB:
return FALSE; SL" ;\[uI
} -|B?pR
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gRIRc4p
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) izsAn"v
AddIcon(); lBqu}88q0
return res; \~UyfVPRT
} Ck8`$x&t
^crk8O@Fw
void CCaptureDlg::AddIcon() M,"4r^%k
{ 9a 9<I
NOTIFYICONDATA data; eUPG){"
data.cbSize=sizeof(NOTIFYICONDATA); '31pb9@fH
CString tip; EgM.wQHR]
tip.LoadString(IDS_ICONTIP); +Gqh
data.hIcon=GetIcon(0); yx"xbCc#
data.hWnd=GetSafeHwnd(); )28Jz6.I
strcpy(data.szTip,tip); osyY+)G'sV
data.uCallbackMessage=IDM_SHELL; kD
dY
i7g>
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1,=U^W.G
data.uID=98; 7D\#1h
Shell_NotifyIcon(NIM_ADD,&data); Rcs7 'q5
ShowWindow(SW_HIDE); m663%b(5>
bTray=TRUE; u`dWU}m)
} y K)7%j!
3GUO
void CCaptureDlg::DeleteIcon() 7GY[l3arxv
{ v^2K=f[nE
NOTIFYICONDATA data; A<2_V1
data.cbSize=sizeof(NOTIFYICONDATA); `An|a~G1
data.hWnd=GetSafeHwnd(); !yU!ta Q
data.uID=98; <use+C2
Shell_NotifyIcon(NIM_DELETE,&data); ke_Dd?
ShowWindow(SW_SHOW); 8.HqQ:?&2t
SetForegroundWindow(); c) Zid1
ShowWindow(SW_SHOWNORMAL); &?YbAo_K
bTray=FALSE; _?#}@?
} /f~V(DK
| V Ps5
void CCaptureDlg::OnChange() '<5Gf1 @|
{ YdX#`
RegisterHotkey(); 34_:.QK-
} <\!+J\YTA
J7W]Str
BOOL CCaptureDlg::RegisterHotkey() +C1/02ZJ
{ eyBLgJt8P
UpdateData(); +Wh0Of
UCHAR mask=0; vS%o>"P
UCHAR key=0; (.4mX
t
if(m_bControl) w G[X*/v
mask|=4; 5jD2%"YUV
if(m_bAlt) 9$8B)x
mask|=2; +:pjQ1LsJ
if(m_bShift) ~f0Bu:A)
mask|=1; o#gb+[
key=Key_Table[m_Key.GetCurSel()]; tNg}:a|J
if(bRegistered){ 5VdF^.:u
DeleteHotkey(GetSafeHwnd(),cKey,cMask); :\9E%/aAD
bRegistered=FALSE; iIji[>qz
} Tn,'*D@l
cMask=mask; 0FD#9r
cKey=key; 4CVtXi_Y
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1.U5gW/3L
return bRegistered; $Q*h+)g<
} K.4t*-<`[
+pp|Qgr 3
四、小结 =UYZ){rt9E
?ORG<11a
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。