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:
ZJBb%d1;
<5z!0m-G 一、实现方法
xE?KJ zs#-E_^%M 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:
e3;D1@ W$zRUG- #pragma data_seg("shareddata")
xo'!$a}I2 HHOOK hHook =NULL; //钩子句柄
|@JTSz*Or UINT nHookCount =0; //挂接的程序数目
{ %X2K static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
lF!PiL static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
vNs%e/~vj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
"V]*ov&[ static int KeyCount =0;
z fSE7i0 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
WC~;t4 #pragma data_seg()
OmWEa l6HtZ( 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。
ekyCZ8iai 3i!a\N4 K 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:
(cLK hn@ &]n }fq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
t(*n[7e cKey,UCHAR cMask)
6Oy:5Ps8a {
(X"5x]7] BOOL bAdded=FALSE;
%(eQ1ir + for(int index=0;index<MAX_KEY;index++){
=figat if(hCallWnd[index]==0){
G`0O5G:1 hCallWnd[index]=hWnd;
q\o#<'F1J HotKey[index]=cKey;
/OztkThx= HotKeyMask[index]=cMask;
S#C-j D bAdded=TRUE;
E72N=7v" KeyCount++;
~+4lmslR break;
]ouoRlb/ }
"t4z)j; }
qK%N{ro[{? return bAdded;
xQvI$vP }
_j, Tc*T //删除热键
;
D<k BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
n?r8ZDJ' {
(v/L BOOL bRemoved=FALSE;
,Lp"Ia for(int index=0;index<MAX_KEY;index++){
}VJ>}i* if(hCallWnd[index]==hWnd){
,g7O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
hTLf$_|P hCallWnd[index]=NULL;
yg}O9!M J HotKey[index]=0;
z]8Mv(eL HotKeyMask[index]=0;
s|<n7 =J bRemoved=TRUE;
Q;3`T7 KeyCount--;
fW2NYQP$: break;
> "F-1{ }
]gPx%c }
-&2Z/qM&! }
#1J,!seJ return bRemoved;
wL),/i&< }
@
,X/Wf ZzE( S O6y:e#0z DLL中的钩子函数如下:
j67a?0<C2U 9y6u&!PZ\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L D[\eJ_ {
_)5E= BOOL bProcessed=FALSE;
45.ks. if(HC_ACTION==nCode)
)b1hF {
QHO n?e
if((lParam&0xc0000000)==0xc0000000){// 有键松开
cN&Ebn switch(wParam)
-rcEG! {
q&@s/k case VK_MENU:
-M=BD-_.h MaskBits&=~ALTBIT;
xFp$JN break;
4utwcXL case VK_CONTROL:
m=9b/Nr4 MaskBits&=~CTRLBIT;
p4z4[=-: break;
*]yrN` case VK_SHIFT:
}>@SyE'Q MaskBits&=~SHIFTBIT;
4Y59^ break;
$5 G(_ default: //judge the key and send message
Iz+%wAZ|B6 break;
O/#3QK }
_=I1 for(int index=0;index<MAX_KEY;index++){
'hr_g* i if(hCallWnd[index]==NULL)
n)5t! continue;
apm%\dN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m^L !_~ {
72~L ? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ZskX!{ bProcessed=TRUE;
}b54O\, }
OlyW/hd }
Q9OCf"n $ }
B`eK_'7t else if((lParam&0xc000ffff)==1){ //有键按下
cL#-vW<s3 switch(wParam)
*RS/`a;, {
Fya*[)HBo case VK_MENU:
}'wZ)N@ MaskBits|=ALTBIT;
$Be hU break;
A!!!7tj case VK_CONTROL:
xT&~{,9 MaskBits|=CTRLBIT;
.\$A7DD+A break;
O1o>eDE5A case VK_SHIFT:
Zm*d)</> MaskBits|=SHIFTBIT;
CJN~p]\ break;
bh5D}w default: //judge the key and send message
_}p[(sTV break;
>+7{PF+sB }
]
hK}ASC for(int index=0;index<MAX_KEY;index++){
%7mGMa/ if(hCallWnd[index]==NULL)
n32"cFPpT continue;
_s@PL59, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'-A;B.GV% {
8zeeC
eI U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>6Uc|D bProcessed=TRUE;
L,A+" }
-'qVnu }
J(}PvkA }
\VhG'd3k if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|qe;+)0>K for(int index=0;index<MAX_KEY;index++){
_(g0$vRP~ if(hCallWnd[index]==NULL)
~-vCY continue;
AmIW$(Ce if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
E'4Psx9: = SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4#>Z.sf //lParam的意义可看MSDN中WM_KEYDOWN部分
eef&ZL6g }
t!3s@ }
O#;sY`fy_M }
`oNJ=,p return CallNextHookEx( hHook, nCode, wParam, lParam );
2LN6pu }
X7-*`NI^ sDNWB_~ 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:
\;MP|:{pU [ S BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}.045 Wuu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
AH n!>w, (y;
6H 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:
stK}K-=` 0'6ai=W LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
v@ QnS {
MuMq%uDA" if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
&G_#=t& {
o#6QwbU25 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
|HT7m5tu4 SaveBmp();
QBXEM= return FALSE;
m2^vH+wD }
>x*[izr/K …… //其它处理及默认处理
9soEHG=P }
*7H
*epUa roc DO8f C~4SPCU 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。
E0RqY3 {Ni]S$7 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
Ojz'p5d`> 3m75mny 二、编程步骤
Nzgi)xX0HX ?xv."I% 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
uz+WVmb 2iM}YCV 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
v\dQjQu8m Tk[]l7R~ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
eb`3'&zV&) &c!6e<o[p 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
%ZD]qaU0 W7A!QS 5、 添加代码,编译运行程序。
Ox#vW6;) G7CkP 三、程序代码
U&6A)SW,k (${:5W ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?7wcv$K5 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
k^|z.$+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]@Y!,bw& #if _MSC_VER > 1000
IrZ\;!NK #pragma once
&4evh<z #endif // _MSC_VER > 1000
>3D1:0Sg #ifndef __AFXWIN_H__
67&IaDts #error include 'stdafx.h' before including this file for PCH
I)1ih #endif
Mj1f;$ #include "resource.h" // main symbols
:(ql=+vDb4 class CHookApp : public CWinApp
D$4GNeB+# {
'z,kxra|n public:
\5&Mg81 CHookApp();
]cP%d-x} // Overrides
zAM9%W2v_ // ClassWizard generated virtual function overrides
@~s5 {4 //{{AFX_VIRTUAL(CHookApp)
dakHH@Q public:
;UgwV/d virtual BOOL InitInstance();
@k;65'"Q virtual int ExitInstance();
VD&wO'U //}}AFX_VIRTUAL
@yb'h`f] //{{AFX_MSG(CHookApp)
M2ex
3m // NOTE - the ClassWizard will add and remove member functions here.
f_O| // DO NOT EDIT what you see in these blocks of generated code !
8D`+3 //}}AFX_MSG
Xj+_"0
# DECLARE_MESSAGE_MAP()
I2HV{1(i };
|~%RSS~b* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Epp>L.?r BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.S|T{DMQ[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
j;uUM6 BOOL InitHotkey();
>
"rM\ Q BOOL UnInit();
%[KnpJ{\ #endif
f=V`Nn<=A p}sM"}Ul //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*LhwIY #include "stdafx.h"
1Q
FsT #include "hook.h"
'Up75eT #include <windowsx.h>
RQWUO^&e^ #ifdef _DEBUG
O,),0zcYF #define new DEBUG_NEW
Z*w({k7] #undef THIS_FILE
Zs/-/C| static char THIS_FILE[] = __FILE__;
6_" n #endif
]t!v`TH #define MAX_KEY 100
<2@t~9 #define CTRLBIT 0x04
6R^F^<< #define ALTBIT 0x02
l-W)?d #define SHIFTBIT 0x01
:I7qw0? #pragma data_seg("shareddata")
[r>hKZU2 HHOOK hHook =NULL;
Ht+ro Y UINT nHookCount =0;
gzi=+oJ|4 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
?;](;n#lU static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)|v du static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
G3|23G.~)( static int KeyCount =0;
En7+fQ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
0^Ldw)C" #pragma data_seg()
**__&Xp1 HINSTANCE hins;
bj0HAgY@ void VerifyWindow();
32+N?[9
* BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
fhZwYx&t //{{AFX_MSG_MAP(CHookApp)
::02? // NOTE - the ClassWizard will add and remove mapping macros here.
;p*L(8<YI // DO NOT EDIT what you see in these blocks of generated code!
@=w)a //}}AFX_MSG_MAP
{(-923|, END_MESSAGE_MAP()
z^gz kXx7 j,].88H CHookApp::CHookApp()
%LC)sSq{H {
4N=,9 // TODO: add construction code here,
wT+60X' // Place all significant initialization in InitInstance
hb~d4J=S }
=CFg~8W *g}==o` CHookApp theApp;
OO/>}? ob LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
zx"EAF{ {
Bi fI.2| BOOL bProcessed=FALSE;
]b}3f< if(HC_ACTION==nCode)
< q(i(% {
yD3vq}U! if((lParam&0xc0000000)==0xc0000000){// Key up
}mp`!7?>O switch(wParam)
P JKY$s. {
*vBhd2HO case VK_MENU:
o|n;{zT" MaskBits&=~ALTBIT;
Kc
r)W break;
h\#4[/ case VK_CONTROL:
C`Vuw|Xl MaskBits&=~CTRLBIT;
1G`5FU break;
o+OX^F0 case VK_SHIFT:
*tZ3?X[b MaskBits&=~SHIFTBIT;
|U1u:=[ break;
5C*Zb3VG4 default: //judge the key and send message
p({|=+bl break;
NY?iuWa*g }
/Tl ybSC1 for(int index=0;index<MAX_KEY;index++){
o>]w76A^( if(hCallWnd[index]==NULL)
]igCV continue;
"e\73?P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O+XQP!T {
oKSW:A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
$(J)F-DB i bProcessed=TRUE;
wAR:GO'n }
)I<VH+6 }
|'i ?o }
Jnt
r"a-4 else if((lParam&0xc000ffff)==1){ //Key down
tMf5TiWu@ switch(wParam)
K'e!BZm6Q {
')F@em case VK_MENU:
-, =)O MaskBits|=ALTBIT;
Np9Pae' break;
\iEJ9V case VK_CONTROL:
ZKI` ; MaskBits|=CTRLBIT;
Ca"i<[8 break;
D0f7I:i1 case VK_SHIFT:
S#+ _HFUK{ MaskBits|=SHIFTBIT;
.*EP$pc break;
K24y;968 default: //judge the key and send message
Q4ii25]* break;
IP !zg|c, }
/Jk.b/t.*S for(int index=0;index<MAX_KEY;index++)
%iV\nFal> {
Y=pRenV' if(hCallWnd[index]==NULL)
qy\SOAh continue;
E.VEW;= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,,9vk \ {
%u|Qh/?7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QIN# \ bProcessed=TRUE;
)Knsy }
8v;T_VN }
/e*<-a }
z9#jXC#OdN if(!bProcessed){
f}FJR6VO for(int index=0;index<MAX_KEY;index++){
Ej VB\6, if(hCallWnd[index]==NULL)
y;9K continue;
NVC$8imip if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=g@hh)3wP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
@izS_I, }
yCg>]6B }
H<b4B$/ }
4f0dc\$ return CallNextHookEx( hHook, nCode, wParam, lParam );
>273V+dy }
SLd9-N}T MT&q~jx* BOOL InitHotkey()
t^9q>[/d` {
6d 8n1_ if(hHook!=NULL){
N)z]
F9Kg nHookCount++;
Q([g1?F9* return TRUE;
v#IZSBvuQK }
oU 8o;zk0 else
HoM8V"8B hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
VxAR,a1+n if(hHook!=NULL)
JY>I nHookCount++;
DNM~/Oo return (hHook!=NULL);
uoBPi[nK }
b;|^62 BOOL UnInit()
eP3 itrH( {
~Uz|sQ*G if(nHookCount>1){
:TWHmxch nHookCount--;
tX}Fb0y return TRUE;
`+@%l*TQ }
m7mC
7x BOOL unhooked = UnhookWindowsHookEx(hHook);
}KkH7XksF if(unhooked==TRUE){
]gj@r[ nHookCount=0;
.^1=*j(; hHook=NULL;
6Ue6b$xE }
]7"mt2Q=3 return unhooked;
Nb{oH +$b }
qm}7w3I^ 1-gX=8]] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C{S6Ri {
ln!KL'T] BOOL bAdded=FALSE;
4'; [' for(int index=0;index<MAX_KEY;index++){
X}bgRzj if(hCallWnd[index]==0){
DFjkp;`1 hCallWnd[index]=hWnd;
tv|=`~Y HotKey[index]=cKey;
)Zm E" HotKeyMask[index]=cMask;
+V\NMW4d bAdded=TRUE;
)'<zC KeyCount++;
bm7$D Kp# break;
r*3XM{bZ/@ }
QnOa?0HL/ }
p|bpE F=U return bAdded;
~E`A, }
AAl`bhx'n qx? lCz a" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
en~(XE1 {
eZJOI1wNp BOOL bRemoved=FALSE;
i|d41u;@ for(int index=0;index<MAX_KEY;index++){
X:g5>is| if(hCallWnd[index]==hWnd){
y.oJzU[p% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
MDCf(LhEH hCallWnd[index]=NULL;
a+BA~|u^ HotKey[index]=0;
Em.? HotKeyMask[index]=0;
W]*wxzf!5z bRemoved=TRUE;
&
='uAw KeyCount--;
wYawG$@_ break;
p9sxA|O=y
}
4-n.4j| }
I5"=b}V5 }
u})JQ<| return bRemoved;
\)"qN^we }
?%0i,p@< QY fS- void VerifyWindow()
"7
4 L {
]V]o%onW for(int i=0;i<MAX_KEY;i++){
XF$C)id2p if(hCallWnd
!=NULL){ nW%c95E
if(!IsWindow(hCallWnd)){ +1623E
hCallWnd=NULL; &]c9}Ic
HotKey=0; dCyQC A[
HotKeyMask=0; *:_hOOT+[
KeyCount--; f3h9CV
} tE>:kx0*3
} QtzHr
} K^vMIo h
} z'I0UB#
NV;tsuA|
BOOL CHookApp::InitInstance() \^:f4ZT
{ Te13Af~
AFX_MANAGE_STATE(AfxGetStaticModuleState()); TPzoU"
qh
hins=AfxGetInstanceHandle(); /kq~*s
InitHotkey(); }R'oAE}$
return CWinApp::InitInstance(); yI;Qb7|^
} )G|UB8]
MLb\:Ihy
int CHookApp::ExitInstance() G j:|
{ u@3w$"Pv1
VerifyWindow(); [)=FZF6kG
UnInit(); x"d*[m
return CWinApp::ExitInstance(); 7> Qt O
} DQ}]'*@?
iB`m!g6$
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oAx0$]+%V)
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) WQ]pg
"
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ] ge-b\
#if _MSC_VER > 1000 `F@yZ4L3S
#pragma once M/qiA.C@W
#endif // _MSC_VER > 1000 N@>S>U8C
EIfrZg7R
class CCaptureDlg : public CDialog IR&u55#I6
{ PTh
Ya
// Construction s5dh]vNN
public: Lsz`nD5
BOOL bTray; WveFB%@`;
BOOL bRegistered; 1,J.
BOOL RegisterHotkey(); x@ O:
UCHAR cKey; wtKh8^:YD
UCHAR cMask; (qrT0D6
void DeleteIcon(); 9+']`=a:
void AddIcon(); 5W48z%MN
UINT nCount; fYi!Z/Ck2
void SaveBmp(); )qIK7;
CCaptureDlg(CWnd* pParent = NULL); // standard constructor hd B[H8Q
// Dialog Data #Grm-W9E
//{{AFX_DATA(CCaptureDlg) ]gW J,
enum { IDD = IDD_CAPTURE_DIALOG }; S7vE[VF5
CComboBox m_Key; one>vi`=
BOOL m_bControl; GwULtRa/
BOOL m_bAlt; yiq#p"Hs
BOOL m_bShift; :KLD~k7yA(
CString m_Path; IY&a!
CString m_Number; ;z>YwRV
//}}AFX_DATA
"gz;Q
// ClassWizard generated virtual function overrides ;~J~g#
//{{AFX_VIRTUAL(CCaptureDlg) _<7FR:oBZ
public: #u$z-M !
virtual BOOL PreTranslateMessage(MSG* pMsg); `vSsgG
protected: K/-D 5U
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support As`^Ku&
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K36B9<F
//}}AFX_VIRTUAL g]#Wve
// Implementation _;{-w%Vf
protected: qg/5m;U
HICON m_hIcon; I .ty-X]
// Generated message map functions z"#.o^5
//{{AFX_MSG(CCaptureDlg) !)=o,sVA
virtual BOOL OnInitDialog(); [}p.*U_nw
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @gc"-V*-/
afx_msg void OnPaint(); EoeEg,'~F
afx_msg HCURSOR OnQueryDragIcon(); EiUV?Gvz
virtual void OnCancel(); P$Q&xN<#)
afx_msg void OnAbout(); @El<"\
afx_msg void OnBrowse(); *@nUas2"
afx_msg void OnChange(); ?s]`G'=>V`
//}}AFX_MSG `,Gk1~Wv
DECLARE_MESSAGE_MAP() [
UJj*n
}; )QD}R36Ic
#endif `9l\~t(M
$ Zr,-
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9_3M}|V$^e
#include "stdafx.h" &?6w2[}
#include "Capture.h" rE:>G]j6
#include "CaptureDlg.h" {)qP34rM
#include <windowsx.h> Cj+=9Dc
#pragma comment(lib,"hook.lib") E6k&r}
#ifdef _DEBUG YC<I|&"
#define new DEBUG_NEW K7c8_g*>4=
#undef THIS_FILE f,>i%.
static char THIS_FILE[] = __FILE__; ex458^N_
#endif N}G(pq}
#define IDM_SHELL WM_USER+1 1`{ib
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8B/9{8
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/GUuu
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "S:N-Tf%U
class CAboutDlg : public CDialog 8A .7=C' z
{ }HorR2(`N
public: :\_MA^<
CAboutDlg(); AtDrQ<>y'
// Dialog Data $lA,{Q
//{{AFX_DATA(CAboutDlg) 59J9V3na
enum { IDD = IDD_ABOUTBOX }; UAZ&*{MM^
//}}AFX_DATA hJsC
\ C,^
// ClassWizard generated virtual function overrides 4
G[hU4L
//{{AFX_VIRTUAL(CAboutDlg) Y;Gm,
protected: 0)V-|v`
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S45>f(!
//}}AFX_VIRTUAL j:3Hm0W3
// Implementation Ai18]QD-
protected: u$8MVP
//{{AFX_MSG(CAboutDlg) v!A|n3B]p
//}}AFX_MSG q&T'x> /
DECLARE_MESSAGE_MAP() f*}E\,V"&
}; Q0\5j<'e
RJ4mlW
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?
M_SNv
{ ZS]f+}0/}
//{{AFX_DATA_INIT(CAboutDlg) 0f/!|c
//}}AFX_DATA_INIT {PtTPz
} 8 {%9%{
Ky$G$H
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7,UFIHq
{ 4CT9-2UC
CDialog::DoDataExchange(pDX); z,YUguc|
//{{AFX_DATA_MAP(CAboutDlg) S=SncMO nE
//}}AFX_DATA_MAP
hP8&n9o
} $4JX#lkt
}tO<_f))
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) PM!t"[@&
//{{AFX_MSG_MAP(CAboutDlg) yuDd%
1k
// No message handlers q.Z#7~6`3
//}}AFX_MSG_MAP v=1S
END_MESSAGE_MAP() AiK4t-
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) | V,jd
: CDialog(CCaptureDlg::IDD, pParent) B-'BJ|*4I
{ 8k?L{hF|nW
//{{AFX_DATA_INIT(CCaptureDlg) }AZx/[k
|z
m_bControl = FALSE; *[:CbFE0y
m_bAlt = FALSE; Yka&Kkw
m_bShift = FALSE; kTc5KHJ7
m_Path = _T("c:\\"); F{~r7y;0
m_Number = _T("0 picture captured."); @ ]wem
nCount=0; e7qMt[.
bRegistered=FALSE; M;V#Gm
bTray=FALSE; s^'#"`!v=
//}}AFX_DATA_INIT M`pTT5r
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .t[ZXrd|0
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); .+L_!A
} l!V| T?
0lr4d Y
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) aw%vu
{ )"jn{%/t
CDialog::DoDataExchange(pDX); ]{+M>i[
//{{AFX_DATA_MAP(CCaptureDlg) K |} ]<
DDX_Control(pDX, IDC_KEY, m_Key); JD`;,Md
DDX_Check(pDX, IDC_CONTROL, m_bControl); ?V:]u3
DDX_Check(pDX, IDC_ALT, m_bAlt); `+Z#*lj|@
DDX_Check(pDX, IDC_SHIFT, m_bShift); bK$D lBZ
DDX_Text(pDX, IDC_PATH, m_Path); rRrW
DDX_Text(pDX, IDC_NUMBER, m_Number); mW0&uSMD
//}}AFX_DATA_MAP ieRBD6_
} G:C6`uiy`
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <ZC^H
//{{AFX_MSG_MAP(CCaptureDlg) s1 ^mk]
ON_WM_SYSCOMMAND() ! vVjZ
ON_WM_PAINT() p2DNbY\]
ON_WM_QUERYDRAGICON() q=%
C (
ON_BN_CLICKED(ID_ABOUT, OnAbout) Y1aF._Z
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `=$jc4@J
ON_BN_CLICKED(ID_CHANGE, OnChange) hIo S#]
//}}AFX_MSG_MAP ^npS==Y]!.
END_MESSAGE_MAP() :F
w"u4WI
fZ~kw*0*
BOOL CCaptureDlg::OnInitDialog() .P:f
{ EJ;0ypbG
CDialog::OnInitDialog(); n.6
0$kR`
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); r2F
ASSERT(IDM_ABOUTBOX < 0xF000); FoD/Q
CMenu* pSysMenu = GetSystemMenu(FALSE); V& j.>Y
if (pSysMenu != NULL) C\^<v&
{ A.C278^O8
CString strAboutMenu; imCl{vt(kj
strAboutMenu.LoadString(IDS_ABOUTBOX); xnuv4Z}]t
if (!strAboutMenu.IsEmpty()) lJ] \
{ 4OZ5hH
h
pSysMenu->AppendMenu(MF_SEPARATOR); mx(%tz^t
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O-!fOdX8_k
} Nw>T$RzS
} Nk7e iQ
SetIcon(m_hIcon, TRUE); // Set big icon VO;UV$$
SetIcon(m_hIcon, FALSE); // Set small icon | ]!Ky[P
m_Key.SetCurSel(0); $x_52 j\j
RegisterHotkey(); LVFsd6:h
CMenu* pMenu=GetSystemMenu(FALSE); E<#4G9O<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9H, &nET
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .Lr)~
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G<^]0`"+)t
return TRUE; // return TRUE unless you set the focus to a control :UDn^(#
} cYWy\+
OQL09u
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam)
b~Pxgfu"
{ Y^ZBA\D2,k
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ['4\O43yv
{ *v
nxP9<
CAboutDlg dlgAbout; Rp`_Grcd
dlgAbout.DoModal(); +`s&i%{1>
} h6T/0YhWLP
else ,[}yf#8@J
{ c<h!QnJ
CDialog::OnSysCommand(nID, lParam); Gz[ymj)5
} e=n{f*KG`
} 7fW=5wc
)Rhf f$
void CCaptureDlg::OnPaint() \abAPo
{ |CZnq-,C
if (IsIconic()) X!#i@V
{ ss0'GfP
CPaintDC dc(this); // device context for painting Vyt~OTI\
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +/!=Ub[:U
// Center icon in client rectangle A{8K#@!
int cxIcon = GetSystemMetrics(SM_CXICON); 0nD=|W\@{
int cyIcon = GetSystemMetrics(SM_CYICON); DYT -#Ht
CRect rect; aa0`y
GetClientRect(&rect); `l gjw=
int x = (rect.Width() - cxIcon + 1) / 2; )_c=mT
int y = (rect.Height() - cyIcon + 1) / 2; 3gI[]4lRH
// Draw the icon Z?~d']XD
dc.DrawIcon(x, y, m_hIcon); e:GgA
} Id.Z[owC`Y
else rxy{a
{ lR@i`)'?U
CDialog::OnPaint(); $nfBvf
} ^L8Wn6s'
} io9xI3{
# +QWi0B
HCURSOR CCaptureDlg::OnQueryDragIcon()
InPy:}
{ ~[uV
return (HCURSOR) m_hIcon; >Z2,^5P{
} Rgfc29(8
pe!dm}!h[
void CCaptureDlg::OnCancel() 3u?`q%Y-e
{ y3KcM#[
if(bTray) ra9cD"/J &
DeleteIcon(); =##s;zj(%
CDialog::OnCancel(); i (%tHa37
} mP)3cc5T
{KU.
void CCaptureDlg::OnAbout() r{q}f)
{ Q9yGQu
CAboutDlg dlg; _Vo)<--+I
dlg.DoModal(); oxMUW<gYd
} }#ep}h
PHRGhKJW})
void CCaptureDlg::OnBrowse() 9b" 9m*gC
{ `s>UU- 9
CString str; 4{*tn"y
BROWSEINFO bi; |ilv|U V
char name[MAX_PATH]; L8bI0a]r"*
ZeroMemory(&bi,sizeof(BROWSEINFO)); B|Fl,55
bi.hwndOwner=GetSafeHwnd(); uO
?Od
bi.pszDisplayName=name; ]<8B-D?Z
bi.lpszTitle="Select folder"; 8NaL{j1`
bi.ulFlags=BIF_RETURNONLYFSDIRS; @ kJ0K
LPITEMIDLIST idl=SHBrowseForFolder(&bi); w*<Y$hnBzF
if(idl==NULL) [:nx);\
return; >k&8el6h
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q$|^~
str.ReleaseBuffer(); R,x> $n
m_Path=str; GP[6nw_'^
if(str.GetAt(str.GetLength()-1)!='\\') <DeKs?v
m_Path+="\\"; Ue{vg$5||
UpdateData(FALSE); X!7VyE+n
} ] Wx>)LT
IP30y>\
void CCaptureDlg::SaveBmp() mFqSD
{ " K 8&{=
CDC dc; ySwYV
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Cdp]Nv6
CBitmap bm; 4?>18%7&
int Width=GetSystemMetrics(SM_CXSCREEN); $N}/1R^?r
int Height=GetSystemMetrics(SM_CYSCREEN); tjZ \h=
bm.CreateCompatibleBitmap(&dc,Width,Height); i\=z'
CDC tdc; x7P([^i
tdc.CreateCompatibleDC(&dc); =y<">-
CBitmap*pOld=tdc.SelectObject(&bm); ET,Q3X\Oe
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y:[BP4H ?y
tdc.SelectObject(pOld); <#+oQ>5s
BITMAP btm; %s$rP
bm.GetBitmap(&btm); w~kHQ%A
DWORD size=btm.bmWidthBytes*btm.bmHeight; ioC@n8_[G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~Na=+}.q_
BITMAPINFOHEADER bih; XYqpI/s
bih.biBitCount=btm.bmBitsPixel; XJx,9trH
bih.biClrImportant=0; $nB-ADRu@
bih.biClrUsed=0; )p$\gwr=2
bih.biCompression=0; M11"<3]D
bih.biHeight=btm.bmHeight; 4meidKw]
bih.biPlanes=1; u(pdP"
bih.biSize=sizeof(BITMAPINFOHEADER); \C]i|]tl
bih.biSizeImage=size; H+4=|mkQ
bih.biWidth=btm.bmWidth; {8^Gs^c
c
bih.biXPelsPerMeter=0; <u/a`E?
bih.biYPelsPerMeter=0; _4P;+Y
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q7,EY /
static int filecount=0; xn(+G$m
CString name; b!i`o%Vb
name.Format("pict%04d.bmp",filecount++); u.Mqj"o\
name=m_Path+name; c%|vUAq*
BITMAPFILEHEADER bfh; cI*KRCU
bfh.bfReserved1=bfh.bfReserved2=0; )Vwj9WD
bfh.bfType=((WORD)('M'<< 8)|'B'); S5i+vUI8C
bfh.bfSize=54+size; nK+lE0
bfh.bfOffBits=54; %&^Q(f
CFile bf; R<f#r0 3@|
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1&"-*)
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); j~M#Ss-H8
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OSp?okV
bf.WriteHuge(lpData,size); 9pWi.J
bf.Close(); #F_'}?09%
nCount++; Dn~Z SrJ
} f>.4-a?
GlobalFreePtr(lpData); `WH[DQ
if(nCount==1) F\>oxttS1
m_Number.Format("%d picture captured.",nCount); ZlthYuJ
else j((hqJr
m_Number.Format("%d pictures captured.",nCount); Y)$52m5rM
UpdateData(FALSE); QJx9I_
} DdBxqkh
n!GWqle
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mJ)tHv"7
{ TE3*ktB{N
if(pMsg -> message == WM_KEYDOWN) (# JMB)
{ @Z?7E8(
if(pMsg -> wParam == VK_ESCAPE) h^}_YaT\
return TRUE; l iw,O 6
if(pMsg -> wParam == VK_RETURN) Pj'62[5z
return TRUE; `vudS?
} +'-rTi\
return CDialog::PreTranslateMessage(pMsg); bfFmTI$,
} 31WZJm^
|2z}Xm5\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {tPnj_|n<
{ KwS`3 6:
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [}z?1Gj;W(
SaveBmp(); 2=>*O
return FALSE; e#tIk;9Xz
} nz^nptw
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XJe/tR
CMenu pop; X]qCS0GD'
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); GGH;Z WSe
CMenu*pMenu=pop.GetSubMenu(0); #C4|@7w%
pMenu->SetDefaultItem(ID_EXITICON); :]'q#$!
CPoint pt; d!o.ASL{
GetCursorPos(&pt); t) LU\!
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q/p(#/y#b
if(id==ID_EXITICON) IWQ&6SDW$z
DeleteIcon(); 1Yud~[c
else if(id==ID_EXIT) cn$5:%IK
OnCancel(); ji}#MBac
return FALSE; C1 W>/?XC
} d7E7f
LRESULT res= CDialog::WindowProc(message, wParam, lParam); djUihcqA`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lqF>=15
AddIcon(); ^%;" [r
return res; [q'eENG
} v{o? #Sk1
g^jJ8k,7(
void CCaptureDlg::AddIcon() >;,gGH
{ ei@3,{~5
NOTIFYICONDATA data; D}MoNE[r
data.cbSize=sizeof(NOTIFYICONDATA); 5:c;RRn
CString tip; ' PELf
P8
tip.LoadString(IDS_ICONTIP); L_^`k4ct
data.hIcon=GetIcon(0); cv= \g Z
data.hWnd=GetSafeHwnd(); Jz0K}^Dj[
strcpy(data.szTip,tip); "=qv#mZ#9
data.uCallbackMessage=IDM_SHELL; z=qWJQ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mmHJh\2v
data.uID=98; V~85oUc\-
Shell_NotifyIcon(NIM_ADD,&data); ZPlPN;J^1
ShowWindow(SW_HIDE); Twx{' S
bTray=TRUE; H<,bq*@
} Uj,g]e8e
okz]Qc>G
void CCaptureDlg::DeleteIcon() EY~7oNfc`R
{ !
tGiTzzp
NOTIFYICONDATA data; UxeL
cUP
data.cbSize=sizeof(NOTIFYICONDATA); ABcBEv3
data.hWnd=GetSafeHwnd(); [m\,+lG?)j
data.uID=98; 8'KMxR
Shell_NotifyIcon(NIM_DELETE,&data); iX{H,-C
ShowWindow(SW_SHOW); fWj@e"G
SetForegroundWindow(); zrrz<dW
ShowWindow(SW_SHOWNORMAL); :9`qogF>
bTray=FALSE; MI\]IQU
} Ir/:d]N*
\#++s&06
void CCaptureDlg::OnChange() 3w6&&R9
{ (xL
:;
RegisterHotkey(); *Rq`*D>:U}
} 3T1P$E" m
dMJ!>l>2
BOOL CCaptureDlg::RegisterHotkey() RyuEHpN}
{ t@)my[ !
UpdateData(); 8"i/wMP]
UCHAR mask=0; M6_-f ;.
UCHAR key=0; r{S=Z~J
if(m_bControl) =U NT.]
mask|=4; )pS8{c)E
if(m_bAlt) Jn*Nao_)
mask|=2; 9:-T@u
if(m_bShift) 0R|K0XH#$
mask|=1; Z(HZB
key=Key_Table[m_Key.GetCurSel()]; $T),DUYO
if(bRegistered){ p.C1 nh
DeleteHotkey(GetSafeHwnd(),cKey,cMask); cz#_<8'N
bRegistered=FALSE; Fj^AWv^/
} &hI>L
cMask=mask; 333u]
cKey=key;
%}h`+L
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "y$ qrN-
return bRegistered; 9 #Y2`pT
} zmb@*/fK
p![&8i@ym
四、小结 vU}: U)S
s`c?:
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。