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:
\|7Y"WEQ
\tfhF#' 一、实现方法
^ux"<? YR.f`-<Z 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:
YH3[Jvzf4 to#T+d.(v #pragma data_seg("shareddata")
S~ZRqL7ZO HHOOK hHook =NULL; //钩子句柄
nm`}Z'&) UINT nHookCount =0; //挂接的程序数目
KV|ywcGhT static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
lT+N{[kLt* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
xeSv+I-b static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
y*j8OA.S static int KeyCount =0;
GD<pqm`vVY static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8]&lUMaqVZ #pragma data_seg()
-hKtd3WbT pJ_>^i= 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。
An=Q`Uxt/ U/:x<Y$ tj 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:
h<FEe~ C-;}a%c" BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
hJGWa%` cKey,UCHAR cMask)
qD>D {
P"k,[ZQ BOOL bAdded=FALSE;
0zqTX< A for(int index=0;index<MAX_KEY;index++){
0@2pw2{Ru if(hCallWnd[index]==0){
vA#?\j2 hCallWnd[index]=hWnd;
~f[91m!+ HotKey[index]=cKey;
5h>t4 [~ HotKeyMask[index]=cMask;
G9jlpf5> bAdded=TRUE;
6 WEu(}= KeyCount++;
E']Gh break;
\:-N<[ }
ATf{;S} }
W'<cAg? return bAdded;
-O>*`
O>M }
2O)2#N //删除热键
ii]'XBSVd BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
l|K`'YS!<{ {
ZUUfn~ORc BOOL bRemoved=FALSE;
{bPcr hB for(int index=0;index<MAX_KEY;index++){
&Qq4xn+J if(hCallWnd[index]==hWnd){
dIDs~ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!FR1yO'd> hCallWnd[index]=NULL;
Yq%D/dU8 HotKey[index]=0;
P7p'j HotKeyMask[index]=0;
Nx"v|" bRemoved=TRUE;
JulxFjC KeyCount--;
_Rnq5y break;
Abf=b<bu }
-~ycr[}x }
g63?(+Fz }
N>_d {=P return bRemoved;
U-3uT&m*9. }
9TILrK kEs=N( *oz=k DLL中的钩子函数如下:
$;t#pN/`
Ss{
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@DYkWivLu {
#L,5;R{` BOOL bProcessed=FALSE;
YP vg(T if(HC_ACTION==nCode)
Y&_1U/}h {
blA]z!FU if((lParam&0xc0000000)==0xc0000000){// 有键松开
L8j#lu switch(wParam)
bNO/CD4 {
6Bfu89 case VK_MENU:
@X6|[r&Z MaskBits&=~ALTBIT;
>SZ9,K4Gs break;
#]5|Qhrr+ case VK_CONTROL:
WS)u{
or MaskBits&=~CTRLBIT;
yi/jZX break;
yD!V;?EnK case VK_SHIFT:
Q{Lsr, MaskBits&=~SHIFTBIT;
xj!_]XJ^w break;
dSBW&-p default: //judge the key and send message
|d1%N'Ll break;
?OPAf4h }
e/h7x\Z for(int index=0;index<MAX_KEY;index++){
_;+N=/l0 if(hCallWnd[index]==NULL)
U-EX)S^T[{ continue;
Epm=&6zf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^R4eW|H {
k6 f;A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
|79!exVMBp bProcessed=TRUE;
nNff~u)I }
xbA% 'p }
/Iu._2 }
'2%/h4jY else if((lParam&0xc000ffff)==1){ //有键按下
=}~hbPJM switch(wParam)
kM?p >V6 {
S,,3h0$X case VK_MENU:
RKP->@Gs MaskBits|=ALTBIT;
U;:,$]+ break;
+xlxhF case VK_CONTROL:
~4iIG}Y< MaskBits|=CTRLBIT;
`$\Y,9E}x break;
@.X}S"yr case VK_SHIFT:
b_ | MaskBits|=SHIFTBIT;
c#e_Fs break;
8EPV\M1% default: //judge the key and send message
0fPqO2 break;
%?EOD=e= }
41TB for(int index=0;index<MAX_KEY;index++){
e+F5FAMR68 if(hCallWnd[index]==NULL)
#={L!"3?e continue;
SS;QPWRZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FBcF {
Zh.fv-Ecp SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
n]@+<TA<uA bProcessed=TRUE;
<nj[=C4v }
v=|BqG` }
k852M^JP }
soZw""|v if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
p\8cl/~ for(int index=0;index<MAX_KEY;index++){
6Bp{FOj:Ss if(hCallWnd[index]==NULL)
zY|]bP[NEH continue;
8P!dk5,,O if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
BifA&o% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
L/GM~*Xp(O //lParam的意义可看MSDN中WM_KEYDOWN部分
?8(`tS(_? }
Co19^g* }
As (C8C< }
IR%a+;Xs return CallNextHookEx( hHook, nCode, wParam, lParam );
"=<lPi }
G6eC.vU]j Prhq ~oI4 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:
2ezuP F @6$r|:]G- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
C)z[Blt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[ylGNuy NI(`o8fN 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:
=,[46 ;q H8K<.RY LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
}C7tlA8,7 {
^^?DYC
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
d!KX.K\NM, {
|-_5ouN. //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
&F'v_9 SaveBmp();
<\^X,,WtO return FALSE;
9'toj%XQ }
Op)0D:BmR …… //其它处理及默认处理
-t6d`p;dR }
k #*|-? f/;\/Q[Z7 fe37T@ 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。
?3}UO:B 2J4|7UwJ 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。
38q@4U=aiw fr#lH3 二、编程步骤
iY|YEi8 ~#a1]w 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";
&vMH
AZd jm-0]ugY&` 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
uAjGR }uHc7gTBF7 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;
)E7A,ZW, _kY5
6 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;
"DlCvjc !7xp<= 5、 添加代码,编译运行程序。
K%pmE?%,8 @6j*XF 三、程序代码
Oq[E\8Wn 3,vH:L4 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
3-mw-;. #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<;6]) #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
/5x`TT #if _MSC_VER > 1000
%C3cdy_c #pragma once
Q"Ec7C5eM #endif // _MSC_VER > 1000
BL8\p_U #ifndef __AFXWIN_H__
I
}/Oi]jA6 #error include 'stdafx.h' before including this file for PCH
_"sRL}-Z #endif
EkL\~^ #include "resource.h" // main symbols
*[SsvlFt class CHookApp : public CWinApp
/B!m|)h5~ {
1!f'nS public:
6fV)8,F3 CHookApp();
WD\{Sdx:r // Overrides
0&.lSwa // ClassWizard generated virtual function overrides
ob00(?;H //{{AFX_VIRTUAL(CHookApp)
4 P;O8KA5y public:
9#(QS+q~ virtual BOOL InitInstance();
[*vN`AfE virtual int ExitInstance();
1}BNG ,n //}}AFX_VIRTUAL
4jz]c"p- //{{AFX_MSG(CHookApp)
yQA[X} // NOTE - the ClassWizard will add and remove member functions here.
epbp9[` // DO NOT EDIT what you see in these blocks of generated code !
=a!6EkX
* //}}AFX_MSG
u.[JYZ
DECLARE_MESSAGE_MAP()
V1:3 };
]T51;j'48 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
|f:d72{Qr BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
q8h{-^" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Qwa"AY5pW BOOL InitHotkey();
?8, N4T0) BOOL UnInit();
+wUhB\F
* #endif
'sF563kE 84!4Vz^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*i{.@RX? #include "stdafx.h"
m6x. "jG #include "hook.h"
Ozv.;}SE #include <windowsx.h>
wY.g-3 #ifdef _DEBUG
:'dc=C #define new DEBUG_NEW
l1)pr{A #undef THIS_FILE
N 9&@,3 static char THIS_FILE[] = __FILE__;
>>bYg #endif
C%c `@="b #define MAX_KEY 100
J3x7i8 #define CTRLBIT 0x04
2jZ}VCzRG #define ALTBIT 0x02
tKeO+6 l #define SHIFTBIT 0x01
j_yFH#^W: #pragma data_seg("shareddata")
W{+0iAYnp HHOOK hHook =NULL;
vEe UINT nHookCount =0;
aTh%oBrtP static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
:UcS$M1LE static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
(bt]GAxb1 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
$JB:rozE static int KeyCount =0;
dO4#BDn"= static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b<(UmRxx3 #pragma data_seg()
ePpK+E[0Z HINSTANCE hins;
{}o>nenx\ void VerifyWindow();
')<FLCFwT BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
4D8y b|o //{{AFX_MSG_MAP(CHookApp)
eH!|MHe // NOTE - the ClassWizard will add and remove mapping macros here.
_
1{5~
// DO NOT EDIT what you see in these blocks of generated code!
M y"!j,Up //}}AFX_MSG_MAP
:ZfUjqRE END_MESSAGE_MAP()
+R#`j r" :5K~/=6x CHookApp::CHookApp()
3d'ikkXK {
01c/;B // TODO: add construction code here,
eAYW%a // Place all significant initialization in InitInstance
_Q}RElA }
.(dmuV9 T{H#]BF<E CHookApp theApp;
(bFWT_CChz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
vx5o
k1UY {
]6%%X+$7 BOOL bProcessed=FALSE;
~:}XVt0%8 if(HC_ACTION==nCode)
'Tf#S@o {
YNJpQAuSn) if((lParam&0xc0000000)==0xc0000000){// Key up
~R?dDL switch(wParam)
v8vh~^X%P {
T3t~=b>&L case VK_MENU:
LB*# MaskBits&=~ALTBIT;
~2A$R'x b break;
KpbZnW}g case VK_CONTROL:
FSwgPIO> MaskBits&=~CTRLBIT;
aBVEk2 p break;
3@ F+ E\k case VK_SHIFT:
.xz,pn} MaskBits&=~SHIFTBIT;
+z jzO]8 break;
>_0 i=.\ default: //judge the key and send message
M`C~6Mf+ break;
#:vDBP05.m }
zUEfa!#? for(int index=0;index<MAX_KEY;index++){
4=F]`Lql if(hCallWnd[index]==NULL)
`\|3
~_v continue;
KB,~u*~! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@Uj_+c
q {
]k`Fl," SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4'{hI;&a& bProcessed=TRUE;
3^A/`8R7K }
jRdhLs,M9 }
i9@;,4f }
;+ Co!L else if((lParam&0xc000ffff)==1){ //Key down
q:-]d0B+ switch(wParam)
}Uwkef.Q {
V:F+HMBk case VK_MENU:
Wq{d8|)1 MaskBits|=ALTBIT;
csFJ5 break;
R%)2(\ case VK_CONTROL:
@O<@f8- MaskBits|=CTRLBIT;
2iR:*}5 break;
zh{@?k case VK_SHIFT:
YM`:L MaskBits|=SHIFTBIT;
fNAo$O4cm break;
rAlh&
?X default: //judge the key and send message
){:q;E]^fB break;
XAQ\OX# }
s}[A4`EWH for(int index=0;index<MAX_KEY;index++)
<w UD {
<*A|pns if(hCallWnd[index]==NULL)
yBPt%EF continue;
5D]30 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~}7$uW0ol {
q:2aPfo& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
SLQ\Y%F bProcessed=TRUE;
^)9MzD^_nV }
rR,+G%[(=4 }
L@1,7@
}
wO2V%v^bp if(!bProcessed){
gqP-E for(int index=0;index<MAX_KEY;index++){
_C< 6349w if(hCallWnd[index]==NULL)
( Lok continue;
S+) l[0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z`emKFbv SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;NiArcAS! }
fV.A=*1l# }
b(PHZCy# }
P3>..fhoW return CallNextHookEx( hHook, nCode, wParam, lParam );
Q vv\+Jp^ }
3W7;f! TIcd
_>TW BOOL InitHotkey()
M>*0r<qn {
~-XOvKJb if(hHook!=NULL){
YMc8Q\*B nHookCount++;
X+]L-o6I2 return TRUE;
~q0I7M }
[,OJX
N-4s else
Od0S2hHO hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
y-w2O] if(hHook!=NULL)
Ujce |>Wn nHookCount++;
G0_&gx` return (hHook!=NULL);
,{.zh&=4 }
U0NOU# BOOL UnInit()
:V&N\>Wo {
[D*J[?yt if(nHookCount>1){
uL2"StW nHookCount--;
1*C:hg@ return TRUE;
Zu\p;!e }
Q0pC4WJ` BOOL unhooked = UnhookWindowsHookEx(hHook);
?TvQ"Y}k if(unhooked==TRUE){
w{k1Y+1 nHookCount=0;
1a7!4)\ hHook=NULL;
u]
F70C^~ }
Ni+3b return unhooked;
DJmoW }
Um]p&phVL %xf)m[JU= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cU7rq j_ {
Yta1` BOOL bAdded=FALSE;
5;X {.2 for(int index=0;index<MAX_KEY;index++){
c u\ls^ if(hCallWnd[index]==0){
Cw
1 9y hCallWnd[index]=hWnd;
~R :<Bw HotKey[index]=cKey;
Ihdu1]~R{ HotKeyMask[index]=cMask;
Gs+\D0o! bAdded=TRUE;
ANckv|&'v KeyCount++;
VLf
g[*k break;
`@h:_d }
m_c O<LB }
U{7 3Xax return bAdded;
Up<~0 }
HH"$#T^- "Kyifw? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/nc~T3j {
{*N^C@ BOOL bRemoved=FALSE;
.4wTjbO6 for(int index=0;index<MAX_KEY;index++){
fJX\'Rc\ if(hCallWnd[index]==hWnd){
+IG1IF if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}KK2WJp#M hCallWnd[index]=NULL;
?3`q+[: HotKey[index]=0;
3>i>@n_ HotKeyMask[index]=0;
;4!=DFbU bRemoved=TRUE;
}c}
( 5 KeyCount--;
fs&,w break;
]\OWZ{T'j }
W@l+ciZ_ }
3@&bxYXm }
o>2e!7 return bRemoved;
c\M#5+ 1j }
6G'<[gL
j 'g]hmE void VerifyWindow()
IQT cYl {
3=Z<wD s for(int i=0;i<MAX_KEY;i++){
;P3>>DZ if(hCallWnd
!=NULL){ 2-~a
P
if(!IsWindow(hCallWnd)){ PfyRZ[3)c
hCallWnd=NULL; lY.B
HotKey=0; B]1HS`*7
HotKeyMask=0; x"vwWJNQ
KeyCount--; z+jh;!i
} tG/1pW
} wa" uFW
} NUMi])HkN
} 3@G;'|z
WE")xhV6
BOOL CHookApp::InitInstance() )%s +?
{ B#]_8svO
AFX_MANAGE_STATE(AfxGetStaticModuleState()); rnu
e(t
hins=AfxGetInstanceHandle(); k_!+V`Ro#
InitHotkey(); ~wTX>qV
return CWinApp::InitInstance(); X:Q$gO?[4
} gA_krK,Z
_vL<h$vD
int CHookApp::ExitInstance() &Cq{
_M
{ .!i0_Rv5x
VerifyWindow(); ;+
G9-
UnInit(); ^|aNG`|O
return CWinApp::ExitInstance(); @44P4?;
} +jtA&1cf
VpSEVd:n
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CN/IH
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4YLs^1'TG0
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >Dne? 8r
#if _MSC_VER > 1000 +e'X;
#pragma once 7IW> >RBF
#endif // _MSC_VER > 1000 Y;,Hzmbs6w
l)Zs-V!M^\
class CCaptureDlg : public CDialog NY@"&p'Q
{ %w7m\nw@
// Construction ZW*n /#GUC
public: JvkL37^n:
BOOL bTray; ^n9a" qz
BOOL bRegistered; ,-@5NY1q
BOOL RegisterHotkey(); 7UKYmJk.
UCHAR cKey; *zy'#`>
UCHAR cMask; RlsVC_H\
void DeleteIcon(); 6
mO"
void AddIcon(); |) Pi6Y
UINT nCount; t8&q9$
void SaveBmp(); Jf)3< ~G
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [Uli>/%JB
// Dialog Data TFy7HX\Oq
//{{AFX_DATA(CCaptureDlg) F6W}mMZH/N
enum { IDD = IDD_CAPTURE_DIALOG }; Gy!P,a)z
CComboBox m_Key; &x0C4Kh
BOOL m_bControl; f7J,&<<5w
BOOL m_bAlt; iITp**l
BOOL m_bShift; C0fmmI0z~
CString m_Path; Qw?+!-7TN
CString m_Number; w(BH247`
//}}AFX_DATA A62<]R)n
// ClassWizard generated virtual function overrides JRO$<
//{{AFX_VIRTUAL(CCaptureDlg) pUCK-rL
public: (KTnJZ
virtual BOOL PreTranslateMessage(MSG* pMsg); ioV_oR9I
protected: <C<`J{X0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iq6a|XGi
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); xMI+5b8
//}}AFX_VIRTUAL 0Q~@F3N-\>
// Implementation O"*`'D|hK
protected: ni6r{eSQ
HICON m_hIcon; 2yKz-"E
// Generated message map functions $%PVJs
//{{AFX_MSG(CCaptureDlg) D|_V<'
virtual BOOL OnInitDialog(); R#(G%66
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4DLq}v
afx_msg void OnPaint(); zX kx7d8
afx_msg HCURSOR OnQueryDragIcon(); Sdd9Dv?!
virtual void OnCancel(); 3]U]?h
afx_msg void OnAbout(); by86zX
afx_msg void OnBrowse(); 1$ML #5+,
afx_msg void OnChange(); mJC3@V
s
//}}AFX_MSG PJgp+u<
DECLARE_MESSAGE_MAP() #U=;T]!'$
}; \t3qS
eWc/
#endif *
OsU Y=;
o>c^aRZ{
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #SkX@sl@
#include "stdafx.h" M3pjXc<O
#include "Capture.h" f vLC_'M
#include "CaptureDlg.h" +a|/l
#include <windowsx.h> }Qrab#v
#pragma comment(lib,"hook.lib") WM,i:P)b
#ifdef _DEBUG 4/*H.Fl
#define new DEBUG_NEW ~p*1:ij
#undef THIS_FILE Pxhz@":[
static char THIS_FILE[] = __FILE__; z^W$%G
#endif Lw*]EG|?
#define IDM_SHELL WM_USER+1 )%Ru#}1X6
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a<m-V&4x
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GBP-V66
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ._CP%
R
class CAboutDlg : public CDialog <7n]Ai@Y
{ 1H{jy^sP 7
public: R$m`Z+/@
CAboutDlg(); iOqk*EL_r\
// Dialog Data 7Kf}O6nE
//{{AFX_DATA(CAboutDlg) (~s|=Hxq|-
enum { IDD = IDD_ABOUTBOX }; &ZJgQ-Pc(m
//}}AFX_DATA ^#e~g/
// ClassWizard generated virtual function overrides Veji^-0E
//{{AFX_VIRTUAL(CAboutDlg) rt4Z;
protected: O~@fXMthh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pOga6'aB)
//}}AFX_VIRTUAL H4<Nnd\
// Implementation C!%:o/
protected: ;sPzOS9
//{{AFX_MSG(CAboutDlg) #[ -\lU|
//}}AFX_MSG @5<CXTdF9c
DECLARE_MESSAGE_MAP() N/~N7MwJj
}; Zk?
=
QH@>icAb
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .px:e)iW
{ onte&Ed\
//{{AFX_DATA_INIT(CAboutDlg) )`HA::
//}}AFX_DATA_INIT Vhg1/EgUr
} Hl7:*]l7b
0ys~2Y!eH
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1 W'F3
{ oq;'eM1,.
CDialog::DoDataExchange(pDX); YaY8 `M{
//{{AFX_DATA_MAP(CAboutDlg) {CUk1+
//}}AFX_DATA_MAP l1+[
} 4]&<?"LSK
P7GRSjG
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -_8*41
//{{AFX_MSG_MAP(CAboutDlg) ZR3nK0
// No message handlers 7}B
//}}AFX_MSG_MAP .36^[Jsz":
END_MESSAGE_MAP() &ak6zM
gPEqjj
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y,m2(V
: CDialog(CCaptureDlg::IDD, pParent) &35|16z%@
{ 8SmjZpQ?
//{{AFX_DATA_INIT(CCaptureDlg) '2^
Yw
m_bControl = FALSE; w+AuMc
m_bAlt = FALSE; #a9_~\s
m_bShift = FALSE; 61K"(r~
m_Path = _T("c:\\"); ..KwTf
m_Number = _T("0 picture captured."); k#)Ad*t
nCount=0; Q9>U1]\
bRegistered=FALSE; (f1M'w/OD
bTray=FALSE; q<{NO/Mm
//}}AFX_DATA_INIT [}o~PN:sT(
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k%Vv?{g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g-)mav
} jqcz\n d
GJQc!cqk
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (ku5WWJ
{ ;vp\YIeX1
CDialog::DoDataExchange(pDX); \t.}-u<7{
//{{AFX_DATA_MAP(CCaptureDlg) TEVI'%F
DDX_Control(pDX, IDC_KEY, m_Key); XutF"9u
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]~c+'E`
DDX_Check(pDX, IDC_ALT, m_bAlt); Ruaur]
DDX_Check(pDX, IDC_SHIFT, m_bShift); 8{I"q[GZ
DDX_Text(pDX, IDC_PATH, m_Path); rT7^-B*
DDX_Text(pDX, IDC_NUMBER, m_Number); =@r--E
//}}AFX_DATA_MAP qfL-r,XS`F
} "mIgs9l$
BBL485`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Hi,t@!!
//{{AFX_MSG_MAP(CCaptureDlg) ff cLuXa
ON_WM_SYSCOMMAND() h)x_zZ%>o
ON_WM_PAINT() RA/EpD:H
ON_WM_QUERYDRAGICON() d@kc[WLD^
ON_BN_CLICKED(ID_ABOUT, OnAbout) FJS'G^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G=d(*+&
B
ON_BN_CLICKED(ID_CHANGE, OnChange) 5nLDj:C~
//}}AFX_MSG_MAP
,=%nw]:
END_MESSAGE_MAP() UpUp8%fCU
iI?{"}BZ
BOOL CCaptureDlg::OnInitDialog() clDHTj=~
{ :nGMtF
CDialog::OnInitDialog(); M] EsS^/X
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lrEj/"M
ASSERT(IDM_ABOUTBOX < 0xF000); `y!/F?o+!
CMenu* pSysMenu = GetSystemMenu(FALSE); >-cfZ9 {!
if (pSysMenu != NULL) OkH\^
{ grcbH
CString strAboutMenu; >SI<rR[~%
strAboutMenu.LoadString(IDS_ABOUTBOX); B5=($?5^6%
if (!strAboutMenu.IsEmpty()) TMj4w,g4
{ fEnQE EU~P
pSysMenu->AppendMenu(MF_SEPARATOR); nkY@_N
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !,&yyx.
} EESN\_{~.
} dbF M,"^
SetIcon(m_hIcon, TRUE); // Set big icon j$@tK0P
SetIcon(m_hIcon, FALSE); // Set small icon {]/8skov5]
m_Key.SetCurSel(0); Zz"}Cz:bX
RegisterHotkey(); l I-p_K
CMenu* pMenu=GetSystemMenu(FALSE); =xl~][
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zICI_*~
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tJD]
(F
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *i%quMv
return TRUE; // return TRUE unless you set the focus to a control ]n
v( aM?d
} tS?lB05TOR
! -tz4vjw
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) T0e<Slo~C
{ ST',4Oph5
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Fwfo2
{ *y7 $xa4
CAboutDlg dlgAbout; Y94MI1O5$
dlgAbout.DoModal(); H5xzD9K;/C
} x0+glQrNN
else LI
W*4r!
{ !`wW_W
CDialog::OnSysCommand(nID, lParam); Faac]5u:*
} r/r:oXK
} S%6U~@hig
*"9<TSU%m
void CCaptureDlg::OnPaint() _%pAlo_6
{ ]T<^{jG
if (IsIconic()) Dn;p4T@
{ hu@7?f_"L/
CPaintDC dc(this); // device context for painting %'ZN`XftG
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); < o I8-f
// Center icon in client rectangle :)c80`-E
int cxIcon = GetSystemMetrics(SM_CXICON); 1/iE`Si
int cyIcon = GetSystemMetrics(SM_CYICON); zVaCXNcbo
CRect rect; 2@i;_3sv
GetClientRect(&rect); cyF4iG'M,y
int x = (rect.Width() - cxIcon + 1) / 2; 3Sh+u>w
int y = (rect.Height() - cyIcon + 1) / 2; _<Dt
z
// Draw the icon 2CLB1
dc.DrawIcon(x, y, m_hIcon); GjQfi'vCk
} %}qbkkZ
else 8l)
{ j6>tH"i
CDialog::OnPaint(); %_f;G+fK\p
} .9M.|
} U[8{_h<#
fE25(wCz7
HCURSOR CCaptureDlg::OnQueryDragIcon() CZ=0mWfF
{ Z9
w:&oa@
return (HCURSOR) m_hIcon; Pl
} b1^cD6sT+
RU_L<Lpi
void CCaptureDlg::OnCancel() ME+em1ZH
{ "JhimgwvY
if(bTray) F!g;A"?V
DeleteIcon(); w~@[r4W
CDialog::OnCancel(); s>[{}7ca
} p@I9<^"
h)dRR_
void CCaptureDlg::OnAbout() P_Uutn~
{ b9("DZW;
CAboutDlg dlg; L.)yXuo4
dlg.DoModal(); ElR)Gd_ 8
} I:;+n^N?
]b1Li}
void CCaptureDlg::OnBrowse() .Q\\dESn"
{ '2v f|CX
CString str; !v>ew9
BROWSEINFO bi; dgc&[
char name[MAX_PATH]; T 33|';k
ZeroMemory(&bi,sizeof(BROWSEINFO)); u''BP.Y S
bi.hwndOwner=GetSafeHwnd(); -2*>`,Uu
bi.pszDisplayName=name; ;z>p8N
bi.lpszTitle="Select folder";
WL-0(
bi.ulFlags=BIF_RETURNONLYFSDIRS; uxDLDA$;
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a$}6:E
if(idl==NULL) X;EJ&g/
return; |]ucHV
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )f*Iomp]@
str.ReleaseBuffer(); }76.6=~
m_Path=str; kk_zVrQ<
if(str.GetAt(str.GetLength()-1)!='\\') ,wK 1=7
m_Path+="\\"; Y!n'" *J>
UpdateData(FALSE); !J^tg2M8:
} *cNk>y
fusPMf *[
void CCaptureDlg::SaveBmp() W"qL-KW
{ O
E|+R4M
CDC dc; B,y3]
g6u
dc.CreateDC("DISPLAY",NULL,NULL,NULL); -!R
l(if
CBitmap bm; VS`Z_Xn
int Width=GetSystemMetrics(SM_CXSCREEN); gCV rC
int Height=GetSystemMetrics(SM_CYSCREEN); 0wvU?z%WK
bm.CreateCompatibleBitmap(&dc,Width,Height); JDhwN<0R
CDC tdc; 9d\N[[Vu]R
tdc.CreateCompatibleDC(&dc); L82NP)St
CBitmap*pOld=tdc.SelectObject(&bm); x#
8IZ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h48 bb.p2
tdc.SelectObject(pOld); E .;io*0
BITMAP btm; F#1kZ@nq
bm.GetBitmap(&btm); {B^pnLc
DWORD size=btm.bmWidthBytes*btm.bmHeight; kI+b <$:D
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Qp+lJAY
BITMAPINFOHEADER bih; q/'MS[C
bih.biBitCount=btm.bmBitsPixel; Au=kSSB
bih.biClrImportant=0; aBlbg3 q
bih.biClrUsed=0; d*9j77C ]
bih.biCompression=0; az
bUc4M
bih.biHeight=btm.bmHeight; Z;J`5=TS
bih.biPlanes=1; /v$]X4 S`
bih.biSize=sizeof(BITMAPINFOHEADER); vKkf2 7
bih.biSizeImage=size; :?#cDyW)
bih.biWidth=btm.bmWidth; =t.F2'<[Z
bih.biXPelsPerMeter=0; `7_n}8NVC
bih.biYPelsPerMeter=0; sT1jF3
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "m>};.lj
static int filecount=0; `~E<Sf<M
CString name; *a4
b
name.Format("pict%04d.bmp",filecount++); C->[$HcRa
name=m_Path+name; v>k b^38
BITMAPFILEHEADER bfh; .~,^u
bfh.bfReserved1=bfh.bfReserved2=0; V=9Bto00
bfh.bfType=((WORD)('M'<< 8)|'B'); }wL3mVz
bfh.bfSize=54+size; 4Q&mC"
bfh.bfOffBits=54; opnkmM&[
CFile bf; MM*-i=
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,O9`X6rh'
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); u]#8$M2
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O3}P07
bf.WriteHuge(lpData,size); 9/H^t*5t
bf.Close(); x`3.Wu\
nCount++; .-%oDuB5zF
} ]>*I) H)
GlobalFreePtr(lpData); d#Wn[h$"
if(nCount==1) ;]u1~
m_Number.Format("%d picture captured.",nCount); 9BurjG1k?
else KM@`YV_"g
m_Number.Format("%d pictures captured.",nCount); yh$ ~*UV
UpdateData(FALSE); ?a8nz, zb
} |nfH-JytV
Nc:U4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 04[)qPPS
{ dcR6KG 8
if(pMsg -> message == WM_KEYDOWN) y|LXDq4Wj
{ 6d(b'S^
if(pMsg -> wParam == VK_ESCAPE) Y?e3B x7*b
return TRUE; bZnDd
if(pMsg -> wParam == VK_RETURN) C64eDX^
return TRUE; -%N}A3m!5
} rZ 6@b
return CDialog::PreTranslateMessage(pMsg); jaNH](V
} '[xut1{
{cX7<7N
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B8>FCF&}E
{ 2nYiG)tg
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ roL]v\tr
SaveBmp(); G dL4|xv
return FALSE; 3XBp6`
} GMt)}Hz
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7TR'zW2W
CMenu pop; ZS|Z98
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); eKS:7:X
CMenu*pMenu=pop.GetSubMenu(0); f`bIQ 9R
pMenu->SetDefaultItem(ID_EXITICON); )/
n29]
CPoint pt; 0-lPhnrp
GetCursorPos(&pt); n*Q4G}p
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); W>VAbm
if(id==ID_EXITICON) >02i8:Tp5K
DeleteIcon(); t2m ^
else if(id==ID_EXIT) s+Cl
OnCancel(); n9w j[t1/
return FALSE; FBE @pd
} B0NN>)h
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dUUPhk0
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |)*m[_1
AddIcon(); YD dLDE
return res; JO]`LF]
} ByC1I.B`
WJBW: 2=;
void CCaptureDlg::AddIcon() (#CBq
{ m|(I} |kT3
NOTIFYICONDATA data; vl>_e
data.cbSize=sizeof(NOTIFYICONDATA); B44]NsYks~
CString tip; m]
EDuW
tip.LoadString(IDS_ICONTIP); {lTR/
data.hIcon=GetIcon(0); H,/~=d:
^
data.hWnd=GetSafeHwnd(); /{49I,
strcpy(data.szTip,tip); e=YO.HT
data.uCallbackMessage=IDM_SHELL; 60(}_%
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F9ZOSL
8Q
data.uID=98; P]{B^,E
Shell_NotifyIcon(NIM_ADD,&data); z[_R"+
ShowWindow(SW_HIDE); Y+}OClS
bTray=TRUE; !#l0@3
} XtnIK
K7n;Zb:BR
void CCaptureDlg::DeleteIcon() q^Q|.&_k /
{ q\-xg*'
NOTIFYICONDATA data; WX+< 4j
data.cbSize=sizeof(NOTIFYICONDATA); FA<Z37:
data.hWnd=GetSafeHwnd(); Z5{*? 2
data.uID=98; |F8;+nAVF#
Shell_NotifyIcon(NIM_DELETE,&data); 1"*Nb5s
ShowWindow(SW_SHOW); U1OLI]P
SetForegroundWindow(); O1l4gduN|i
ShowWindow(SW_SHOWNORMAL); Q'>_59
bTray=FALSE; D>,$c
} Oct\He\.
}7f 1(#{7
void CCaptureDlg::OnChange() S"I#>^
{ H@ 1[SKBl
RegisterHotkey(); kG_&-b
} KE&InTM/j
tr#)iZ\
BOOL CCaptureDlg::RegisterHotkey() ?Xy w<fMQ
{ oxxE'cx{g
UpdateData(); :*^(OnIe
UCHAR mask=0; i2`.#YJ&v
UCHAR key=0; R.^Bxi-UG:
if(m_bControl) ;+aDjO2(
mask|=4; \xa36~hh40
if(m_bAlt) ,.1&Ff)S
mask|=2; YA1{-7'Q
if(m_bShift) ]JhDRJ\
mask|=1; 7%~VOB
key=Key_Table[m_Key.GetCurSel()]; Bh.6:9{
if(bRegistered){ '_Hb}'sFI
DeleteHotkey(GetSafeHwnd(),cKey,cMask);
b{9HooQ{
bRegistered=FALSE; $j$\ccG
} !>"INmz
cMask=mask; f@,hO5h(_|
cKey=key; >TH-Q[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c +"O\j'
return bRegistered; PW~cqo B71
} .q~,.yI&j
#b<lt'gC
四、小结 T-<> )N5y
XACEt~y
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。