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:
\-8aTF
&]pY~zVc 一、实现方法
sfk;c#K c$x>6&&L 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:
`eeA,K_ Z9eP(ip #pragma data_seg("shareddata")
9I(00t_ HHOOK hHook =NULL; //钩子句柄
Y]DC; , UINT nHookCount =0; //挂接的程序数目
mJYD"WgY static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
A_crK`3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
E] rBq_S static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
<==6fc>s static int KeyCount =0;
gBOF#"- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Hyi'z 1 #pragma data_seg()
odn3*{c{x g} pD% 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。
%e:[[yq)G <6+T&Ov6 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:
7"1]5\p^g $g),|[x+( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\2CEEs' cKey,UCHAR cMask)
Yr[&*>S {
R?M>uaxn BOOL bAdded=FALSE;
L_o/fTz4 for(int index=0;index<MAX_KEY;index++){
@M"(
r"ab if(hCallWnd[index]==0){
'$[%x hCallWnd[index]=hWnd;
=|dHD HotKey[index]=cKey;
k 7:Z\RGy HotKeyMask[index]=cMask;
U+zntB bAdded=TRUE;
R2JPLvs KeyCount++;
O=6[/oc
' break;
"28zLo3 }
w~yC^` }
3,n" d- return bAdded;
k n/xt }
<GF^VT|Ce //删除热键
!t}yoN
n| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z\cD98B# {
RFX{]bQp9 BOOL bRemoved=FALSE;
!(gSXe)* for(int index=0;index<MAX_KEY;index++){
=.w~qL if(hCallWnd[index]==hWnd){
$hMD6<e if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Cj$:TWYIh[ hCallWnd[index]=NULL;
Qe-PW9C HotKey[index]=0;
<W+9h0c HotKeyMask[index]=0;
AH_qZTv0{Q bRemoved=TRUE;
"BZ@m:I6hy KeyCount--;
3O;"{E=
< break;
Hg$7[um }
).AMfBQ=; }
"Q{l])N }
2$v8{Y& return bRemoved;
EWr7eH }
_3.rPS,s nLCaik_,m (4#iLs DLL中的钩子函数如下:
R:j
mn x2'pl
(^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4-I7"pW5 {
pC #LQ BOOL bProcessed=FALSE;
7O:g;UI# if(HC_ACTION==nCode)
N,l"9>CF {
SlwQ_F"4L if((lParam&0xc0000000)==0xc0000000){// 有键松开
JW)f'r_f switch(wParam)
/nn~&OU {
Y6Ux*vhK case VK_MENU:
Cy)N hgz MaskBits&=~ALTBIT;
{e q378d break;
9M5W4& case VK_CONTROL:
XMdCQ= MaskBits&=~CTRLBIT;
.rS.
>d^n break;
dMCoN8W case VK_SHIFT:
bwj{5-FU MaskBits&=~SHIFTBIT;
0a bQY break;
t=9f:,I$ default: //judge the key and send message
jsx&h
Y%( break;
{&UA60~6 }
57=d;Yg e for(int index=0;index<MAX_KEY;index++){
K:GEC- if(hCallWnd[index]==NULL)
WIuYSt)h continue;
g[bu9i if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:Zx|= {
`oH4"9&]k3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
SN]g4}K- bProcessed=TRUE;
Ln t 1 }
)(_NFpM }
-e_op'` }
(m6V)y else if((lParam&0xc000ffff)==1){ //有键按下
[cco/=c switch(wParam)
2pU'&8 {
DR,7rT{$ case VK_MENU:
'#h ORQB MaskBits|=ALTBIT;
Ow.DBL)x'> break;
r/HTkXs I case VK_CONTROL:
5+;Mc[V3- MaskBits|=CTRLBIT;
IvlfX`(" break;
|:.Uw\z5' case VK_SHIFT:
5[4nFa}R:5 MaskBits|=SHIFTBIT;
s]|tKQGl, break;
79D~Mau# default: //judge the key and send message
t
7o4 aBl" break;
1U/RMN3` }
)RT?/N W for(int index=0;index<MAX_KEY;index++){
([}08OW@ if(hCallWnd[index]==NULL)
x)GheM^ continue;
zBu@a:E%H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&0tW{-Hv" {
nj1o!+9>$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
YB<nz<;JR bProcessed=TRUE;
bX,#z, }
=J)<Nx.gA }
wDGb h= }
GZ,MC?W if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
=B5{ 7g\ for(int index=0;index<MAX_KEY;index++){
N5,LHO if(hCallWnd[index]==NULL)
mC$y*G continue;
y_w
<3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.xWaS8f SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
K3M.ZRh\;` //lParam的意义可看MSDN中WM_KEYDOWN部分
'^>}
=f }
8Znr1=1
}
6u lx0$[ }
K@{0]6 return CallNextHookEx( hHook, nCode, wParam, lParam );
$#p5BQQ| }
6<$.Z-, oBo*<6 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:
{it}\[3 tx~,7TMS/ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s1[&WDedM BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
NjpWK;L u[Kz^ga< 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:
vdC0tax [l3\0e6-/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
F8"J<VJ7 {
K) fKL
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
@j_o CDS {
{+=hYB|& //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
P.C?/7$7Z+ SaveBmp();
R54ae:8 return FALSE;
I;%1xdPt }
l nHY?y7{ …… //其它处理及默认处理
peBHZJ``RX }
>Zs! ;Vs2e pu]U_Ll@ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
`bfUP s wjwCs` 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
&:&l+ ]vvA]e 二、编程步骤
Sx'oa$J Eu'E;*-f 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";
"Zh,;)hS L"vrX 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
wbAwmOiZ Gd_0FF . 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;
,v
K%e>e& 19qHWU^0V 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;
Pz{MYw z$R&u=J 5、 添加代码,编译运行程序。
;mQ|+|F6X Rw{'
O]Q* 三、程序代码
-Pp{aFe bE.<vF& ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
4@3 \Ihv #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
c-(RjQ~M5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
N,-C+r5}<4 #if _MSC_VER > 1000
#p>&|I #pragma once
K~,!IU_QG #endif // _MSC_VER > 1000
J<"K`|F #ifndef __AFXWIN_H__
l`zhKj #error include 'stdafx.h' before including this file for PCH
d{JI]
! #endif
4X]/8%]V #include "resource.h" // main symbols
Ja:4EU$Lu class CHookApp : public CWinApp
Os-Z_zSl6 {
JX&]>#6|E public:
m;l[flQ~ CHookApp();
rIPfO'T? // Overrides
+;lDU}$ // ClassWizard generated virtual function overrides
7HH@7vpJ^ //{{AFX_VIRTUAL(CHookApp)
E> GmFw public:
<b,WxR` virtual BOOL InitInstance();
XXum2eA virtual int ExitInstance();
4"kc(J`c //}}AFX_VIRTUAL
mc%.
8i //{{AFX_MSG(CHookApp)
nUpj+F# // NOTE - the ClassWizard will add and remove member functions here.
s 0Uid&qE // DO NOT EDIT what you see in these blocks of generated code !
e}yF2|0FD //}}AFX_MSG
k-
9i DECLARE_MESSAGE_MAP()
>^Wpc };
LF!KP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
\O"H#gt BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
m`-:j"]b$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
jyW={%& BOOL InitHotkey();
/)J]ItJlz BOOL UnInit();
W7WHDL^ #endif
OU7OX]h ]NTQF/ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
!AE;s}v)0{ #include "stdafx.h"
Yc]k<tQ #include "hook.h"
9nc_$H{ #include <windowsx.h>
.:}<4;Qz94 #ifdef _DEBUG
#;a+)~3*O #define new DEBUG_NEW
hzr,
%r #undef THIS_FILE
wi7Br&bGi static char THIS_FILE[] = __FILE__;
'yX\y
6I #endif
;X+tCkzF #define MAX_KEY 100
xbhHP2F| #define CTRLBIT 0x04
=@M9S #define ALTBIT 0x02
b'+Wf#.]f0 #define SHIFTBIT 0x01
Yv]vl6< #pragma data_seg("shareddata")
VVch% HHOOK hHook =NULL;
i4D]> UINT nHookCount =0;
^UKY1Q. static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
C;HEvq7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
6
:3Id static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}C_g;7* static int KeyCount =0;
f\cTd/?Ju static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
1$03:ve1 #pragma data_seg()
J' P:SC1 HINSTANCE hins;
^2$b8]q void VerifyWindow();
)yb~ kbe BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
mvT/sC7I //{{AFX_MSG_MAP(CHookApp)
!Z2h?..O // NOTE - the ClassWizard will add and remove mapping macros here.
A4@z+ebb l // DO NOT EDIT what you see in these blocks of generated code!
zqdkt ` //}}AFX_MSG_MAP
/c=8$y\%@ END_MESSAGE_MAP()
& n@hD7=( <}~
/. Cx CHookApp::CHookApp()
Tdh.U{Nz {
>l)x~Bkf$j // TODO: add construction code here,
;~:Z~8+{c // Place all significant initialization in InitInstance
,^c-}`!K }
-{OJM|W+ ,0h{RZKw CHookApp theApp;
)
6QJZ$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
jW8ad{ {
8/R$}b>< BOOL bProcessed=FALSE;
N*Q*>q if(HC_ACTION==nCode)
B">Ko3 {
npkT>dB+ if((lParam&0xc0000000)==0xc0000000){// Key up
<Nrtkf4-O switch(wParam)
Pzzzv^+ {
>Um(gbG case VK_MENU:
)fXw ~ MaskBits&=~ALTBIT;
F~eYPaEKy! break;
z. hq2v case VK_CONTROL:
U9`Co&Z2 MaskBits&=~CTRLBIT;
n-M6~ break;
>qy62:co case VK_SHIFT:
`$1A;wg< MaskBits&=~SHIFTBIT;
TxQsi"0c break;
SHPDbBS default: //judge the key and send message
d1g7:s9$0 break;
(G+)v[f }
a] c03$f K for(int index=0;index<MAX_KEY;index++){
,/p+#|>C= if(hCallWnd[index]==NULL)
Ou4hAm91s continue;
$> QJ%v9+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{wSz >, {
.R`_"7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/!Ag/SmS!9 bProcessed=TRUE;
P|ibUxSA~, }
j07A>G-= }
Cd^1E]O0{ }
q/*veL else if((lParam&0xc000ffff)==1){ //Key down
k}g4? switch(wParam)
qmnl {
aOinD case VK_MENU:
r\fkx> MaskBits|=ALTBIT;
F7C+uGTs break;
4Hf'/%kW case VK_CONTROL:
XLiwE$:t% MaskBits|=CTRLBIT;
5#f_1
V break;
fGeie m case VK_SHIFT:
1
Lg {l MaskBits|=SHIFTBIT;
&k*oG:J3 break;
ImB5F'HI$ default: //judge the key and send message
)g8Kicox5 break;
$HOe){G }
b (HJ| for(int index=0;index<MAX_KEY;index++)
wGs'qL"z {
e@O]c" if(hCallWnd[index]==NULL)
5.\|*+E~ continue;
"\+\,C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-XnIDXM {
&$T7eOiZ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
p<D@l2vt bProcessed=TRUE;
%=K [C }
"+O/OKfR0 }
_Ad63.Uq)) }
[C-FJ>=S if(!bProcessed){
GK6~~ga= for(int index=0;index<MAX_KEY;index++){
-8"K|ev if(hCallWnd[index]==NULL)
N@X6Z!EO continue;
It2:2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
UnVa`@P^:G SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
ib> ~3s; }
TT;ls<(Lg }
R9- mq;u+ }
p {.6 return CallNextHookEx( hHook, nCode, wParam, lParam );
fbdpDVmpU }
N8x&<H .P5'\ BOOL InitHotkey()
MR4k#{:w {
Y>c+j if(hHook!=NULL){
<M5fk?n,| nHookCount++;
@v&P;=lU return TRUE;
w?*79 u }
4k{xo~+%, else
_XT; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2Gj)fMK38 if(hHook!=NULL)
_@)-#7 nHookCount++;
^u90N>Dvq return (hHook!=NULL);
q3v5gz^t }
;c|_z 9+ BOOL UnInit()
^XYK
}J {
c*<BU6y if(nHookCount>1){
"ig)7X+Wz| nHookCount--;
M;AvOk|& return TRUE;
pIpdVKen }
M|@@
LJ' BOOL unhooked = UnhookWindowsHookEx(hHook);
m%;LJ~R if(unhooked==TRUE){
-~J5aG[@~> nHookCount=0;
3 TV4|&W; hHook=NULL;
* _usVg }
x<w-j[{k_K return unhooked;
6e.l#
c!1} }
7z\#"~(. h{\S '8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
hfc~HKLC {
>^,?0HP BOOL bAdded=FALSE;
gCRPaF6 for(int index=0;index<MAX_KEY;index++){
;2?fz@KZ if(hCallWnd[index]==0){
u+6L>7t88I hCallWnd[index]=hWnd;
D^s#pOZS HotKey[index]=cKey;
&>Z;>6J, HotKeyMask[index]=cMask;
[\fwnS_1 bAdded=TRUE;
E}0g KeyCount++;
1jBIi break;
~-sG&u> }
e*I92 }
iW9 return bAdded;
6h&t%T }
\v{HjqVkC QAl4w)F BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}2c&ARQ.m> {
mL#$8wUdt{ BOOL bRemoved=FALSE;
/c!^(5K
fT for(int index=0;index<MAX_KEY;index++){
<dXeP/1w` if(hCallWnd[index]==hWnd){
I+3=|Vef if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fX\y/C hCallWnd[index]=NULL;
qv:DpK HotKey[index]=0;
|RXXj [z HotKeyMask[index]=0;
o1{3[=G bRemoved=TRUE;
2zv:j7 KeyCount--;
|h/{qpsu break;
heWQPM|s }
Ix(,gDN }
Ne3YhCC> }
tK# /S+l return bRemoved;
?-0, x|ul }
E 8$S0u;` y5^OD63s void VerifyWindow()
&b%2Jx[+ {
{C8IYBm for(int i=0;i<MAX_KEY;i++){
pP"j| if(hCallWnd
!=NULL){ 8aM\B%NGWi
if(!IsWindow(hCallWnd)){ -V"W
hCallWnd=NULL; sC2NFb-+&
HotKey=0; Pv)^L
HotKeyMask=0; 3-Xd9ou
KeyCount--; BT3yrq9
} nLANWQk9
} f4f)9n
} t-}IKrbv
} z7P~SM
Qk|+Gj
BOOL CHookApp::InitInstance() J5<16}*
{ KCp9P2kv.
AFX_MANAGE_STATE(AfxGetStaticModuleState()); x",ktE>9
hins=AfxGetInstanceHandle(); rmWsob
InitHotkey(); CQ{{J{pU"
return CWinApp::InitInstance(); Vvfd?G"
} zyP/'X_~:
_sL;E<)y(
int CHookApp::ExitInstance() 7@k3-?q
{ G-:7,9
VerifyWindow(); 7>0/$i#'Vl
UnInit(); x]R0zol
return CWinApp::ExitInstance(); r%$\Na''
} 0$=U\[og
]HXHz(?;F
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Oc.8d<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \;Q!}_ K
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6rCUq
#if _MSC_VER > 1000 *]Cyc<
#pragma once Rz&}e@stl
#endif // _MSC_VER > 1000 -Oz! GX
>'WTVj `
class CCaptureDlg : public CDialog xwHE,ykE
{ c7WOcy@M
// Construction ZnuRy:
public: '*@=SM
BOOL bTray; #i*PwgC%_
BOOL bRegistered; \O,yWyU4
BOOL RegisterHotkey(); T#I}w\XlhP
UCHAR cKey; 4 +p1`
UCHAR cMask; ^q%f~m,O<
void DeleteIcon(); nYvkeT
void AddIcon(); Lm1JiPs d
UINT nCount; _)YB*z5
void SaveBmp(); U 17=/E
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Dk2Zl
// Dialog Data ~,8#\]xR
//{{AFX_DATA(CCaptureDlg) q @wX=
enum { IDD = IDD_CAPTURE_DIALOG }; L`9.Gf
CComboBox m_Key; E7w^A
BOOL m_bControl; . _Jypk8
BOOL m_bAlt; cbzS7q<)
BOOL m_bShift; C}L2'l,
CString m_Path; *&+zI$u(
CString m_Number; yOP$~L#TWs
//}}AFX_DATA 0&\71txrzg
// ClassWizard generated virtual function overrides a^[s[j#^,
//{{AFX_VIRTUAL(CCaptureDlg) h\~!!F
public: ^4Se=Hr
z2
virtual BOOL PreTranslateMessage(MSG* pMsg); qa8?bNd'f
protected: fgF@ x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /V]i3ac
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p=i6~
//}}AFX_VIRTUAL gnb+i`
// Implementation _,e4?grP#
protected:
Z}SqiT
HICON m_hIcon; o,0
Z^"|
// Generated message map functions _oefp*iWS
//{{AFX_MSG(CCaptureDlg) fI=p^k:
virtual BOOL OnInitDialog(); *UG?I|l|I
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $kkL)O*"]
afx_msg void OnPaint(); NH=@[t)P,
afx_msg HCURSOR OnQueryDragIcon(); iex]J@=e
virtual void OnCancel(); =n@\m<
afx_msg void OnAbout(); W,!7_nl"u
afx_msg void OnBrowse(); i!(5y>I_
afx_msg void OnChange(); x~D8XN{
//}}AFX_MSG 2<'ol65/c
DECLARE_MESSAGE_MAP() 28-z
}; I,]q;lEMt
#endif :RBeq,QaO
>Af0S;S
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file OKu~Nb*
#include "stdafx.h" t9lf=+%s
#include "Capture.h" <1_3`t
#include "CaptureDlg.h" )?LZg<<
#include <windowsx.h> wCj)@3F
#pragma comment(lib,"hook.lib") hwi_=-SL
#ifdef _DEBUG pm[i#V<v
#define new DEBUG_NEW 66_=bd(9
#undef THIS_FILE |X6R2I
static char THIS_FILE[] = __FILE__; Rz*GRe
#endif 6 lEv<)cC
#define IDM_SHELL WM_USER+1 %ca` v;].
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _?I*::
I
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7lwFxP5QT
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ) <w`:wD
class CAboutDlg : public CDialog U5?QneK
{ t23W=U
public: ^L.'At
CAboutDlg(); cveQ6
-`K
// Dialog Data *Aug7
HlS
//{{AFX_DATA(CAboutDlg) :}gEt?TUhs
enum { IDD = IDD_ABOUTBOX };
ZcTjOy?
//}}AFX_DATA Ahr
// ClassWizard generated virtual function overrides hb}Qt Q
//{{AFX_VIRTUAL(CAboutDlg) - _%~b
protected: 'jye*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :<5jlpV(
//}}AFX_VIRTUAL <HpUP!q8v
// Implementation Ufor>
protected: t"MrrK>T
//{{AFX_MSG(CAboutDlg) P1Iy>%3
//}}AFX_MSG r-]%R:U*
DECLARE_MESSAGE_MAP() w:=:D=xH2
}; 6
Pdao{P
q{f (T\
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5as5{"l
{ 'cc{sjG
//{{AFX_DATA_INIT(CAboutDlg) Np$ue
}yr
//}}AFX_DATA_INIT l2Rnyb<;;
} it-2]Nw
E!L_"GW
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -q?,
{ ]4K4Nh~
CDialog::DoDataExchange(pDX); X7tBpyi
//{{AFX_DATA_MAP(CAboutDlg) tv:
mjS
//}}AFX_DATA_MAP 3hA5"G+7
} #n|eq{fkK
h$%h w+"4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) n +2>jY
//{{AFX_MSG_MAP(CAboutDlg) 'tX}6wurf
// No message handlers mSk";UCn
//}}AFX_MSG_MAP 8-@HzS%
END_MESSAGE_MAP() QDKY7"H
xNLgcb@v>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) q:vGG K^
: CDialog(CCaptureDlg::IDD, pParent) wZKmU
{ .4<lw
//{{AFX_DATA_INIT(CCaptureDlg)
f<'D?d)L^
m_bControl = FALSE; W"A3$/nq^
m_bAlt = FALSE; _|;{{8*?
m_bShift = FALSE; z 8#{=e
m_Path = _T("c:\\"); nFn}
m_Number = _T("0 picture captured."); 2 ksbDl}
nCount=0; )/2TU]//
bRegistered=FALSE; j}fSz)`i
bTray=FALSE; rQ&XHG>Q*
//}}AFX_DATA_INIT W?[
C
au-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 l?L s=J*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E, oR.B
} ,V zbKx,
Zv8_<>e
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?H_>?,^
{ \pP1k.~UnC
CDialog::DoDataExchange(pDX); 4Bt)t#0
//{{AFX_DATA_MAP(CCaptureDlg) T!^v^m@>y
DDX_Control(pDX, IDC_KEY, m_Key); \+x#aN\
DDX_Check(pDX, IDC_CONTROL, m_bControl); 6X!jNh$oF
DDX_Check(pDX, IDC_ALT, m_bAlt); ]c6h'}
DDX_Check(pDX, IDC_SHIFT, m_bShift); 10N0?K"
DDX_Text(pDX, IDC_PATH, m_Path); O&VA79\UO
DDX_Text(pDX, IDC_NUMBER, m_Number); {Wfwf
//}}AFX_DATA_MAP z2#k/3%o=
} -*kZ2grLt
@,LU!#y(
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <5G 4|l
//{{AFX_MSG_MAP(CCaptureDlg) ]x%sX|Rj
ON_WM_SYSCOMMAND() jc,Qg2
ON_WM_PAINT() -av=5hm
ON_WM_QUERYDRAGICON() <KE%|6oER
ON_BN_CLICKED(ID_ABOUT, OnAbout) K;>9K'n
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jBd=!4n
ON_BN_CLICKED(ID_CHANGE, OnChange) J2Qt! -
//}}AFX_MSG_MAP k$kxw_N5d
END_MESSAGE_MAP() 5Z=GFKf|
Il#ST
BOOL CCaptureDlg::OnInitDialog() _c(h{dn
{ iI &z5Q2
CDialog::OnInitDialog(); XdnpL$0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E*s _Y
ASSERT(IDM_ABOUTBOX < 0xF000); Zt9ld=T
CMenu* pSysMenu = GetSystemMenu(FALSE); _!w69>Nj
if (pSysMenu != NULL) 9Q7342
{ u}rJqZ
CString strAboutMenu; NH*"AE;
strAboutMenu.LoadString(IDS_ABOUTBOX); UVW4KUxR
if (!strAboutMenu.IsEmpty()) vjA!+_I6
{ a^Q
?K\c4N
pSysMenu->AppendMenu(MF_SEPARATOR); .*z$vl
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \c!e_rZ
} #CW{y?=
} #<#-B v
SetIcon(m_hIcon, TRUE); // Set big icon w?Cho</Xu
SetIcon(m_hIcon, FALSE); // Set small icon l j+p}dt
m_Key.SetCurSel(0); m9\~dD
RegisterHotkey(); @CoUFdbz
CMenu* pMenu=GetSystemMenu(FALSE); vZ^U]h V
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7 ;2>kgf~
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); j8^zE,Z
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m8+
EMBl
return TRUE; // return TRUE unless you set the focus to a control }?HWUAL\
} A-rj: k!
,-DU)&dF
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^
q3H
{ *nv^s
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5'<mfY'B
{ lAGntYv
CAboutDlg dlgAbout; +x~p&,w?
dlgAbout.DoModal(); 0oqOX
} JgV4-B0
else 9hJ
a K
{ ZkNet>9
CDialog::OnSysCommand(nID, lParam); =-qYp0sVP
} $if(n||
} k?1e+ \
y'z9Ya
void CCaptureDlg::OnPaint() _94R8?\_V7
{ w$""])o,
if (IsIconic()) o"kL,&
{ _lC0XDZ
CPaintDC dc(this); // device context for painting "{c@}~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); CioS}K
// Center icon in client rectangle \6pQ&an
int cxIcon = GetSystemMetrics(SM_CXICON); Gh<#wa['}
int cyIcon = GetSystemMetrics(SM_CYICON); #F6M<V'
CRect rect; [jGE{<Je
GetClientRect(&rect); @4Q/J$
int x = (rect.Width() - cxIcon + 1) / 2; F;Q'R|HQ
int y = (rect.Height() - cyIcon + 1) / 2; u(PUbxJ
V
// Draw the icon (nYGN$qC9
dc.DrawIcon(x, y, m_hIcon); kjt(OFh'Y+
} l% qh^0
else by$mD_sr
{ rqKK89fD'
CDialog::OnPaint(); M-e|$'4u
} Z4m+GFY
} =c%gV]>G
#RKd>ig%
HCURSOR CCaptureDlg::OnQueryDragIcon() Ds{DVdqA$c
{ o
WAy[
return (HCURSOR) m_hIcon; FtDF}
} 2tQ?=V(Di
_{GD\Ai_W
void CCaptureDlg::OnCancel() 8v=t-GJW
{ +WguWLO"
if(bTray) QT|\TplJt
DeleteIcon(); m';4`Y5-
CDialog::OnCancel(); *Xn6yL9
} H|'n|\{lt
Y^XZ.R
void CCaptureDlg::OnAbout() M<SV H_
{ e+?;Dc-SJ\
CAboutDlg dlg; f>m! }F:
dlg.DoModal(); sHOBT,B
} "s@q(J
;{0%Vp{
void CCaptureDlg::OnBrowse() 8?w#=@ s
{ ~3|)[R=+p1
CString str; N{6-a
BROWSEINFO bi; Q<yvpT(
char name[MAX_PATH]; JZJb&q){
ZeroMemory(&bi,sizeof(BROWSEINFO)); BHU=TK@GR
bi.hwndOwner=GetSafeHwnd(); '<O.J(N~4!
bi.pszDisplayName=name; 162Dj$
bi.lpszTitle="Select folder"; &G?w*w_n
bi.ulFlags=BIF_RETURNONLYFSDIRS; ~
cI`$kJ
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `X B$t?xi
if(idl==NULL) /4upw`35]
return; c @KNyBy2
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >GmO8dK
str.ReleaseBuffer(); &4*f28 s
m_Path=str; <y#@v G
if(str.GetAt(str.GetLength()-1)!='\\') <X?xr f
m_Path+="\\"; #E#@6ZomT
UpdateData(FALSE); 48{B} j%oU
} X9C:AGbp
y!|4]/G]?t
void CCaptureDlg::SaveBmp() +=*ND<$n/E
{ //bQD>NBO
CDC dc; ET%F+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); R''2o_F6
CBitmap bm; )r(e\_n
int Width=GetSystemMetrics(SM_CXSCREEN); s~c cx"HH
int Height=GetSystemMetrics(SM_CYSCREEN); KbH|'/w
bm.CreateCompatibleBitmap(&dc,Width,Height); 8k_hX^
CDC tdc; Un&rP70
tdc.CreateCompatibleDC(&dc); Dw,LB>Eq,
CBitmap*pOld=tdc.SelectObject(&bm); n>)h9q S
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v7f[$s$m
tdc.SelectObject(pOld); hb>uHUb&
BITMAP btm; m]}EVa_I`/
bm.GetBitmap(&btm); 8<J3Xe
DWORD size=btm.bmWidthBytes*btm.bmHeight; {J/+KK
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7'ws: #pC
BITMAPINFOHEADER bih; OUN"'p%%
bih.biBitCount=btm.bmBitsPixel; yvnvI y
bih.biClrImportant=0; !P6?nS
bih.biClrUsed=0; ;Q[E>j?w=
bih.biCompression=0; q3|SZoN
bih.biHeight=btm.bmHeight; BG6Lky/omz
bih.biPlanes=1; xFA`sAucr
bih.biSize=sizeof(BITMAPINFOHEADER); l .m #
bih.biSizeImage=size; V=Z%y$1Bc
bih.biWidth=btm.bmWidth; EH'eyC-B<
bih.biXPelsPerMeter=0; H)rJ>L
bih.biYPelsPerMeter=0; :]LW,Eql
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;)ERxMun
static int filecount=0; E_{P^7Z|Jg
CString name; g O8~$Aj
name.Format("pict%04d.bmp",filecount++); #(Yd'qKo
name=m_Path+name; 'Hu+8,xA
BITMAPFILEHEADER bfh; %Siw>
bfh.bfReserved1=bfh.bfReserved2=0; MYVb !
bfh.bfType=((WORD)('M'<< 8)|'B'); OK
z5;#S=
bfh.bfSize=54+size; WY26Iq@C
bfh.bfOffBits=54; SzG?m]
CFile bf; 2\F'So
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sBNqg~HwB?
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }T53y6J#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <d{>[R)
bf.WriteHuge(lpData,size); 8sq0 BH
bf.Close(); 8SCXA9}
nCount++; aaI5x
} 8 v da"
GlobalFreePtr(lpData); aLwEz}-
if(nCount==1) EWWCh0
{
m_Number.Format("%d picture captured.",nCount); Iomx"y]9
else oMNBK/X_
m_Number.Format("%d pictures captured.",nCount); {<cgeH
UpdateData(FALSE); KSUhB
}
af/0e}-
A>*#Nw5L
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u_*y~1^0
{ JQW7y!Z
if(pMsg -> message == WM_KEYDOWN) D"{%[;J
{ zJOyr"B'8
if(pMsg -> wParam == VK_ESCAPE) 9|K:\!7
return TRUE; drp< f1`l8
if(pMsg -> wParam == VK_RETURN) Tq8U5#NF
return TRUE; uTy00`1
} C @P$RVS
return CDialog::PreTranslateMessage(pMsg); F#RtU :R
}
1b@]^Ue
[5GzY`/m
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dX-j3lM:#
{ FQ/z,it_i
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i{r[zA]$
SaveBmp(); Z,>owoP4
return FALSE; dSS Ai
|}
} nr&9\lG]G
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W^eQ}A+Z
CMenu pop; UAC"jy1D
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I1p{(fJ
CMenu*pMenu=pop.GetSubMenu(0); raM{!T:
pMenu->SetDefaultItem(ID_EXITICON); UUvR>5@n
CPoint pt; k7 Ne(4P
GetCursorPos(&pt); xzf/W+.>.
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~e5E%bXxC
if(id==ID_EXITICON) O1oh,~W
DeleteIcon(); 5K=>x<
else if(id==ID_EXIT) S4!B;,?AxN
OnCancel(); }3-`e3
return FALSE; WHRBYq_
} 02^Nf7DMR
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;rXZ?"
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) uzS;&-nA
AddIcon(); _iu^VK,}
return res; k?Njge6@
} u\f QaQV
k40`,;}9
void CCaptureDlg::AddIcon() 6-\M }xq?
{ 6dRvx;d
NOTIFYICONDATA data; OZe`>Q6
data.cbSize=sizeof(NOTIFYICONDATA); - P4X@s_;
CString tip; 5 &]a8p{
tip.LoadString(IDS_ICONTIP); >ffQ264g=i
data.hIcon=GetIcon(0); UxnZA5Lk*
data.hWnd=GetSafeHwnd(); pO2XQYhrY
strcpy(data.szTip,tip); z%$M
IC
data.uCallbackMessage=IDM_SHELL; S AKIFNE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 98CS|NEe
data.uID=98; c3O&sa
V!
Shell_NotifyIcon(NIM_ADD,&data); G6X5`eLQ
ShowWindow(SW_HIDE); i,l$1g-i
bTray=TRUE; :=K+~?
} gbu)bqu2x
mqiCn]8G
void CCaptureDlg::DeleteIcon() =ibKdPtTh^
{ L;
<Pod
NOTIFYICONDATA data; IkQ,#Bsb[
data.cbSize=sizeof(NOTIFYICONDATA); bFJ>+ {#
data.hWnd=GetSafeHwnd(); ?%b#FXA
data.uID=98; +rKV*XX@
Shell_NotifyIcon(NIM_DELETE,&data); zOis}$GR
ShowWindow(SW_SHOW); Z
jXn,W]~
SetForegroundWindow(); 35fj-J$8
ShowWindow(SW_SHOWNORMAL); 2>xEE
bTray=FALSE; H$6;{IUz~
} I8\R7s3
ZD4:'m`T/
void CCaptureDlg::OnChange() sTxbh2
{ mwF{z.t"
RegisterHotkey(); !"
@<!
} S]gV! Q4%
<
WQ
~X<1D
BOOL CCaptureDlg::RegisterHotkey() <Q_E3lQy/
{ 48.4GwL7
UpdateData(); D+Z2y1
UCHAR mask=0;
$qiM_06
UCHAR key=0; *^ua2s.
if(m_bControl) 2
yRUw
mask|=4; ixB"6O
if(m_bAlt) 'lOpoWDL
mask|=2; c']m5q39'
if(m_bShift) ZUl-&P_X
mask|=1; <#)Q.P
key=Key_Table[m_Key.GetCurSel()]; g!`^!Q/($
if(bRegistered){ sLc,Dx"+
DeleteHotkey(GetSafeHwnd(),cKey,cMask); $IJ"fs
bRegistered=FALSE; v
`;Hd8
} yxi* 4R
cMask=mask; { ^R>H|~
cKey=key; Dt'bbX'edw
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t* =i8`8
return bRegistered; L^Fb;sJYI
} <}}u'5;^?x
*d-JAE
四、小结 C-^8;xd
r(g#3i4Q
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。