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:
i?g5_HI
8'nVwb8I 一、实现方法
I3mGo lXiKY@R# 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:
P5nO78 ]?
g@jRs #pragma data_seg("shareddata")
?_vakJ
) HHOOK hHook =NULL; //钩子句柄
2Yn <2U/^R UINT nHookCount =0; //挂接的程序数目
DN~nk static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
u!X|A`o5i static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
DSk/q-'u static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
F,dx2ZPIs? static int KeyCount =0;
cy3B({PLy static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
S` ;?z #pragma data_seg()
X/2&!O }O^zl# 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。
F,MO@&ue" ^T$|J;I DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
ahOM CZF| ,Pjew% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*q".-u!D[ cKey,UCHAR cMask)
dEA6 {
O6/f5 BOOL bAdded=FALSE;
X{'q24\F for(int index=0;index<MAX_KEY;index++){
pd7NF-KD if(hCallWnd[index]==0){
-
'W++tH= hCallWnd[index]=hWnd;
?$^2Umt0 HotKey[index]=cKey;
xScLVt<\e HotKeyMask[index]=cMask;
(>GK\=:< bAdded=TRUE;
`[)YEgs KeyCount++;
%i-c0|,T4 break;
S=nzw-(I }
&[/w_|b }
)Es"LP] return bAdded;
$lIz{ySJv }
;\Y&ce //删除热键
T}P".kpbS BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
JSW}*HR {
X+}1 BOOL bRemoved=FALSE;
"4H
+!r} for(int index=0;index<MAX_KEY;index++){
;YX4:OBqr if(hCallWnd[index]==hWnd){
}'/`2!lY if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I'iGt~4$ hCallWnd[index]=NULL;
0_"fJ~Y^J HotKey[index]=0;
*c*0PdV HotKeyMask[index]=0;
Vq;A>
bRemoved=TRUE;
?yR&/a KeyCount--;
&n?^$LTPY break;
.0rh y2 }
"zFNg'; }
ur@Z|5 }
@8^[!F return bRemoved;
Mt5PaTjj }
*B{j.{
p( @reeO= C@W"yYt DLL中的钩子函数如下:
,o,I5>` h{p=WWK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>ByXB!Wi+ {
``e$AS BOOL bProcessed=FALSE;
*nsAgGKKM^ if(HC_ACTION==nCode)
]=";IN:SU {
GBFtr if((lParam&0xc0000000)==0xc0000000){// 有键松开
D]~MC switch(wParam)
_DNHc* {
j;3[KLmuK% case VK_MENU:
:WL'cJ9a MaskBits&=~ALTBIT;
#x3ujJ break;
mP P`xL?T case VK_CONTROL:
F[[TWf/ MaskBits&=~CTRLBIT;
ehG/zVgn break;
Ve!fU case VK_SHIFT:
D{d>5P?W MaskBits&=~SHIFTBIT;
HnCzbt@ break;
m"jV}@agX default: //judge the key and send message
)
^3avRsC break;
$Gv9m }
Bw64 for(int index=0;index<MAX_KEY;index++){
*9c!^$V if(hCallWnd[index]==NULL)
Fa_VKAq continue;
pL%r,Y_^\x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{=-\|(Bx {
uDSxTz{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
wqW0v\ bProcessed=TRUE;
*b}lF4O? }
L^4-5`gj }
| j a- }
i?:_:"^x else if((lParam&0xc000ffff)==1){ //有键按下
[[Y0 switch(wParam)
JPWOPB'H {
w MP case VK_MENU:
' dx1x6 MaskBits|=ALTBIT;
nn9wdt@.] break;
O
Wj@<N case VK_CONTROL:
k{$ ao MaskBits|=CTRLBIT;
(%o2jroQ# break;
0`A~HH} case VK_SHIFT:
0}xFD6{X MaskBits|=SHIFTBIT;
k`p74MWu break;
]t*[%4 default: //judge the key and send message
$aPfGZ<i break;
-x4X O`b }
0,Y5KE{ for(int index=0;index<MAX_KEY;index++){
01. &>Duw if(hCallWnd[index]==NULL)
a~!G%})'a continue;
-yg?V2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
VA%Un,5h {
CZt \JW+" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Z)xaJGbw bProcessed=TRUE;
ld7v3:M }
R
&4Z*?S }
+@K09ge }
]a3iEA2 ( if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
lP!;3iJ B for(int index=0;index<MAX_KEY;index++){
!\;FNu8_. if(hCallWnd[index]==NULL)
<P;}unq.kw continue;
( nab if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[wB9s{CX SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
LtKI3ou //lParam的意义可看MSDN中WM_KEYDOWN部分
FSbHn{@ }
pdEiqLhH }
_ _>.,gL7 }
9bq<GC'eX8 return CallNextHookEx( hHook, nCode, wParam, lParam );
eDZ8w }
0W()lQ `\6?WXk3T 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
rJInj>|{= eBO@7F$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z>06hBv(?Y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"AhTH.ZP u}|%@=xn 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:
>xn}N6Rj2~ ulJX1I=|p LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
n%\
/J {
2{.QjYw^ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
\S)2 {
yj(vkifEB //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^@_m "^C SaveBmp();
+/;*| return FALSE;
zn@N'R/ }
(x$9~;<S*d …… //其它处理及默认处理
|fY/i]
Ax }
KB!|B.ChN( zPKr/ e~T@~(fft 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
;u(Du-Os! OLj\-w^ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
nPgeLG"00 W Qc> 二、编程步骤
?P7]u>H <(e8sNe 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
|J~eLh[d CCGV~e+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ACK1@eF }V|{lvt. 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
ez9k4IO rqlc2m,<-p 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
^U8r0]9 ^:jN3@Q% 5、 添加代码,编译运行程序。
yRYWch R,
8s_jN 三、程序代码
l"zUv m%8qZzqk ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
DBs*Fx[ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
1]T`n /d V #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
2qO3XI #if _MSC_VER > 1000
{3Vk p5%l #pragma once
Jj^GWZRu #endif // _MSC_VER > 1000
w_iam qe, #ifndef __AFXWIN_H__
CC3v%^81l^ #error include 'stdafx.h' before including this file for PCH
l#wdpD a{ #endif
h
!(>7/Gi #include "resource.h" // main symbols
zK+52jhi class CHookApp : public CWinApp
TjBY
4 {
<[/%{sUNC public:
ozr9>b>M CHookApp();
2`=6 %s
// Overrides
:;!\vfZbU // ClassWizard generated virtual function overrides
'iLH `WE //{{AFX_VIRTUAL(CHookApp)
{hO`6mr&t public:
H2-28XGc virtual BOOL InitInstance();
@lUlY2 virtual int ExitInstance();
3v!~ cC~cI //}}AFX_VIRTUAL
(,xZGa //{{AFX_MSG(CHookApp)
mty1p'^KQ // NOTE - the ClassWizard will add and remove member functions here.
qUF1XJZ}z // DO NOT EDIT what you see in these blocks of generated code !
0X(]7b&~R //}}AFX_MSG
!z
zW2> DECLARE_MESSAGE_MAP()
qYp$fmj };
efuK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
kDz>r#% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wn11\j& BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2PSTGG8JV BOOL InitHotkey();
7>
Pgc BOOL UnInit();
hD<f3_k #endif
XL}<1-} L6i|:D32p //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
%E27.$E_ #include "stdafx.h"
~-F?Mc #include "hook.h"
6bZ[Kt #include <windowsx.h>
7=*VpX1 #ifdef _DEBUG
|H ;+1 #define new DEBUG_NEW
7XyOB+aQO #undef THIS_FILE
lg1PE7 static char THIS_FILE[] = __FILE__;
Jll-X\O`- #endif
O hR1Jaed #define MAX_KEY 100
G(1 K9{i$ #define CTRLBIT 0x04
396R$\q #define ALTBIT 0x02
5GAy "Xd #define SHIFTBIT 0x01
yD)"c. #pragma data_seg("shareddata")
$X+u={] HHOOK hHook =NULL;
u:`y] UINT nHookCount =0;
g3?U#7i static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
?4)v`* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
r[Zq3 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
q?~Rnv static int KeyCount =0;
ZcryAm:I static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
$~'Tf>e #pragma data_seg()
?Cci:Lin HINSTANCE hins;
<kD#SV%" void VerifyWindow();
y?N Nz0 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
LN!W(n( //{{AFX_MSG_MAP(CHookApp)
/b.oEGqZX // NOTE - the ClassWizard will add and remove mapping macros here.
Y&'8VdW // DO NOT EDIT what you see in these blocks of generated code!
8HoP(+? //}}AFX_MSG_MAP
qvLDfN END_MESSAGE_MAP()
C 7nKk/r !g0cC.' CHookApp::CHookApp()
XSB8z
{
?(im+2 // TODO: add construction code here,
iY.eJlfH // Place all significant initialization in InitInstance
KC&`x| }
+|C[-W7Sw :J(sXKr[C CHookApp theApp;
@PcCiGZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
nJVp.*S {
{(vOt ' BOOL bProcessed=FALSE;
zd`=Ih2Wx if(HC_ACTION==nCode)
GzdgL"M[ {
.T3=Eq&"W if((lParam&0xc0000000)==0xc0000000){// Key up
Z%v6xP. switch(wParam)
jFj~]]j {
vg5NY =O case VK_MENU:
[{PqV):p MaskBits&=~ALTBIT;
E5B8 Z?$a break;
H(\V+@~>AD case VK_CONTROL:
i@$-0%, MaskBits&=~CTRLBIT;
*e<_; Kr? break;
_F8T\f| case VK_SHIFT:
LC'2q*:' MaskBits&=~SHIFTBIT;
Gm&2R4 )EP break;
U4_"aT>My default: //judge the key and send message
gGKKs&n7 break;
: z~!p~ }
w4:<fnOM for(int index=0;index<MAX_KEY;index++){
\X@IkL$r if(hCallWnd[index]==NULL)
56s*A*z$
; continue;
-fux2?8M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
YIDg'a+z {
cjg=nTsBA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
dp^N_9$cdO bProcessed=TRUE;
v"k4ATWP }
AA7#c7 }
aii'}c }
BQ#jwu0e else if((lParam&0xc000ffff)==1){ //Key down
<"I?jgo switch(wParam)
VC=6uB {
8!j=vCv case VK_MENU:
uJPH~mdW MaskBits|=ALTBIT;
b|E/LKa break;
uiK:*[ case VK_CONTROL:
!Y%D
9 MaskBits|=CTRLBIT;
>0T3'/k<H break;
#^\}xn"[ case VK_SHIFT:
$j
!8? MaskBits|=SHIFTBIT;
h[l{ 5Z* break;
U,3d) ]Zy& default: //judge the key and send message
.S|-4}G(6 break;
3LrsWAz' }
j_pw^I$C for(int index=0;index<MAX_KEY;index++)
&HxT41pku {
WLy7'3@ if(hCallWnd[index]==NULL)
^I./L)0=} continue;
X RRJ)}P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>q &L/N5 {
fm6]CU1^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l\U*sro< bProcessed=TRUE;
;qT5faKB3J }
`GkRmv* }
M+UMR+K }
kh&_#, if(!bProcessed){
<`mOU}0) for(int index=0;index<MAX_KEY;index++){
S&|VkZR) if(hCallWnd[index]==NULL)
td/5Bmj continue;
nCB[4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
36i_D6 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]n1D1 }
7xR|_+%~K }
Fc{((x s }
auA.6DQ return CallNextHookEx( hHook, nCode, wParam, lParam );
t;XS;b% }
J/gQQ.s 1Q_ ``.M BOOL InitHotkey()
7NUenCdc {
WFpl1O73 if(hHook!=NULL){
6)+9G_ nHookCount++;
&"O_wd[+: return TRUE;
4I1K vN<A }
WnO DDr
else
+cw{aI`a8 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
U;>B7X;`E4 if(hHook!=NULL)
>";%2u1 nHookCount++;
"DzGBu\ return (hHook!=NULL);
&}|0CR.( }
\y,;Cfl< BOOL UnInit()
i/M+t~ {
"9u-lcQ\
if(nHookCount>1){
67,3i~ nHookCount--;
I`#EhH return TRUE;
p1uN]T7> }
=jBL'|k5 BOOL unhooked = UnhookWindowsHookEx(hHook);
~W/}:;
if(unhooked==TRUE){
Bx%=EN5. nHookCount=0;
eAU"fu6d hHook=NULL;
<M`-`v6H }
"j
+v,js return unhooked;
Q+/R
JM?3@ }
=G[H,;W 1S^'C2/b BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,^M]yr*~ {
Q{`@
G"' BOOL bAdded=FALSE;
]uJM6QuQ for(int index=0;index<MAX_KEY;index++){
mf#fA2[ if(hCallWnd[index]==0){
f!^)!~ hCallWnd[index]=hWnd;
MXh^dOWR HotKey[index]=cKey;
=>.DD<g" HotKeyMask[index]=cMask;
j@_nI~7f} bAdded=TRUE;
I@+lFG KeyCount++;
,$o-C&nC break;
_4~k3%w\`l }
gnYnL8l`J }
e=-YP8l
return bAdded;
\S'cWB }
oNrEIgaA(+ Ep,1}Dx BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Za34/ro/T {
-wBnwn- BOOL bRemoved=FALSE;
Y<de9Z@ for(int index=0;index<MAX_KEY;index++){
IZ|c<#r6 if(hCallWnd[index]==hWnd){
Mn-<5 1.% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_y|[Z; hCallWnd[index]=NULL;
AK%=DVkM HotKey[index]=0;
R+k=Ea&x HotKeyMask[index]=0;
x ru(Le}E bRemoved=TRUE;
F: f2s:< KeyCount--;
?UU5hek+m break;
{kT#o3,>w6 }
pFS
F[9?e> }
$/MY,:*e }
T27:"LVw return bRemoved;
K@y-)I2] }
J,MT^ B gjO
*h3` void VerifyWindow()
(tgEa{rPAP {
WvIK=fdZ$ for(int i=0;i<MAX_KEY;i++){
x0y%\ if(hCallWnd
!=NULL){ cvn-*Sj
if(!IsWindow(hCallWnd)){ =H
L9Z
hCallWnd=NULL; iM4mkCdOO
HotKey=0; `6dy
U_f
HotKeyMask=0; #!(Zn:[
KeyCount--; A!n~8zcmp}
} X9p+a,
} LqMe'z
} 7 _X&5ni
} #tCIuQ,
eOO!jrT:
BOOL CHookApp::InitInstance() YmdsI+DbIu
{ 2K5}3<KD/
AFX_MANAGE_STATE(AfxGetStaticModuleState()); cq-e
c7
hins=AfxGetInstanceHandle(); *G8'Fjin'T
InitHotkey(); (D:KqGqoT
return CWinApp::InitInstance(); tzx:*
} Rs`Vr_?Hk
+>n.T
int CHookApp::ExitInstance() k*A4;Bm
{ k?!TjBKm
VerifyWindow(); kO
/~i
UnInit(); H0 {Mlu9
return CWinApp::ExitInstance(); bWhJ^LD
} Fmy1nZ
2l]C55p)s
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :-W$PIBe
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^xBb$
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ F Bd+=bx,Z
#if _MSC_VER > 1000 FjK Ke7
#pragma once ju
@%A@s
#endif // _MSC_VER > 1000 H@VBP
Q}Q
Y j,9V],
class CCaptureDlg : public CDialog &Z;Eu'ia
{ 5%vP~vy_}
// Construction sE(X:[Am
public: .D>A'r8U
BOOL bTray; \ x>NB
BOOL bRegistered; }xpe
BOOL RegisterHotkey(); g)2m$#T&s
UCHAR cKey; G7Edi;y/{
UCHAR cMask; Z&2
&wD
void DeleteIcon(); PQr#G JG7
void AddIcon(); #JX|S'\x
UINT nCount; ;,[EJR^CI
void SaveBmp(); 1q;I7_{ 2
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 853]CK<
// Dialog Data Udb0&Y1^
//{{AFX_DATA(CCaptureDlg) 7lnM|nD
enum { IDD = IDD_CAPTURE_DIALOG }; o.v,n1Nm
CComboBox m_Key; Q*TQ*J7".X
BOOL m_bControl; ]~4}(\u
BOOL m_bAlt; 0TuNA\Ug+
BOOL m_bShift; $~;6 hnrm
CString m_Path; _R>s5|_
CString m_Number; ?STI8AdO
//}}AFX_DATA RXCygPT
// ClassWizard generated virtual function overrides <"j"h=tm}
//{{AFX_VIRTUAL(CCaptureDlg) _dH[STT
public: |\yDgs%EGy
virtual BOOL PreTranslateMessage(MSG* pMsg); 7z0;FW3>9
protected: \`p |,j
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X"]mR7k
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dUBVp 9PB
//}}AFX_VIRTUAL :$) aMEq
// Implementation o
=jX
protected: 5VY%o8xXa
HICON m_hIcon; -NI@xJO4(;
// Generated message map functions &**.naSo
//{{AFX_MSG(CCaptureDlg) i&AXPq>`
virtual BOOL OnInitDialog(); jb6ZAT<8
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 06j)P6Iju
afx_msg void OnPaint(); dqK
afx_msg HCURSOR OnQueryDragIcon(); \Ho#[k=y*/
virtual void OnCancel(); .1l[l5$
afx_msg void OnAbout(); *(_ON$+3
afx_msg void OnBrowse(); -h.3M0
afx_msg void OnChange(); t 's5~
//}}AFX_MSG /eI,]CB'z
DECLARE_MESSAGE_MAP() ]J0Y^dM
}; ^O,6(@>
#endif xq#]n^
)2*|WHO
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0(.R?1*:Rf
#include "stdafx.h" 42H#n]Y
#include "Capture.h" -qr:c9\px
#include "CaptureDlg.h" 'p{Y{
$Q
#include <windowsx.h> E!oJ0*@
#pragma comment(lib,"hook.lib") C$EFh4
#ifdef _DEBUG QjT#GvHY
#define new DEBUG_NEW Xl
'\krz
#undef THIS_FILE iI/'!85
static char THIS_FILE[] = __FILE__; +q>C}9s3
#endif & t @
#define IDM_SHELL WM_USER+1 rUJSzLy
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ygu?w7
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '~!l(&X
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +&@l{x(,
class CAboutDlg : public CDialog r]K0
]h@B
{ 0v,`P4_k
public: YH:W]
CAboutDlg(); r>D[5B
// Dialog Data ]mDsUZf<
//{{AFX_DATA(CAboutDlg) #|2g{7g*
enum { IDD = IDD_ABOUTBOX }; qoyGs}/I8
//}}AFX_DATA g^|_X1{
// ClassWizard generated virtual function overrides SJY"]7
//{{AFX_VIRTUAL(CAboutDlg) T<_1|eH
protected: e^K=8IW
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Yc( )'6
//}}AFX_VIRTUAL A?<"^<A^
// Implementation bN~'cs8 e
protected: Q'V,?#
//{{AFX_MSG(CAboutDlg) I$sm5oL
//}}AFX_MSG ::h02,y;1%
DECLARE_MESSAGE_MAP() =,1zl}PR
}; }j5@\c48
I(r5\A=
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) p>hCh5
{ :X'U`jE
//{{AFX_DATA_INIT(CAboutDlg) )SO1P6
//}}AFX_DATA_INIT V3Rnr8
} ]q\=
'$&(+>)z`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) h;h,dx
{ iH -x
CDialog::DoDataExchange(pDX); Q(eQZx{
//{{AFX_DATA_MAP(CAboutDlg) 5;uX"zG
//}}AFX_DATA_MAP ^[,1+WS%
} E`LIENm
"}Sid+)<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) f0s<Y
//{{AFX_MSG_MAP(CAboutDlg) ^IegR>
// No message handlers [!|d[
//}}AFX_MSG_MAP !t
[%'!v
END_MESSAGE_MAP() BsG[#4KM:
KARQKFp!C>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LZ<(:S
: CDialog(CCaptureDlg::IDD, pParent) Ab|NjY:
{ bTYP{x~ y
//{{AFX_DATA_INIT(CCaptureDlg) 0GLB3I >
m_bControl = FALSE; b`%e{99\
m_bAlt = FALSE; za 4B+&JJ
m_bShift = FALSE; 7QRvl6cv
m_Path = _T("c:\\"); 4Fht(B|
m_Number = _T("0 picture captured."); !wufoK
nCount=0; hdWp
bRegistered=FALSE; g 0_r
bTray=FALSE; \<+47+
//}}AFX_DATA_INIT pHbguoH,
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3lEU$)QA3
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x)Om[jZE
} 5~TA(cb5
tfU3 6PR
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /3HWP`<x
{ +c2=*IA/
CDialog::DoDataExchange(pDX); Woy[V
//{{AFX_DATA_MAP(CCaptureDlg) ##\ZuJ^-
DDX_Control(pDX, IDC_KEY, m_Key); +_K;Pj]x
DDX_Check(pDX, IDC_CONTROL, m_bControl); dg@/HLZ
DDX_Check(pDX, IDC_ALT, m_bAlt); :a<TV9?H0
DDX_Check(pDX, IDC_SHIFT, m_bShift); =kkA
DDX_Text(pDX, IDC_PATH, m_Path); 0BZOr-i
DDX_Text(pDX, IDC_NUMBER, m_Number); #~qp8
w
//}}AFX_DATA_MAP U@ QU8
} 4BL,/(W]
x
wOl-iN=
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) SYhspB
//{{AFX_MSG_MAP(CCaptureDlg) %3B>1h9N
ON_WM_SYSCOMMAND() .0/Z'.c8
ON_WM_PAINT() E;e2{@SX2K
ON_WM_QUERYDRAGICON() iPL'JVPZ
ON_BN_CLICKED(ID_ABOUT, OnAbout) YQd&rkr
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bI0+J)
ON_BN_CLICKED(ID_CHANGE, OnChange) ~Am
%%$
//}}AFX_MSG_MAP 17i@GnbNb
END_MESSAGE_MAP() .j@n6RyN
@ dU3d\!}
BOOL CCaptureDlg::OnInitDialog() 4'e8VI0
{ JA2}
CDialog::OnInitDialog(); ^bw~$*"j#
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
vX )Y%I
ASSERT(IDM_ABOUTBOX < 0xF000); ap_+C~%+
CMenu* pSysMenu = GetSystemMenu(FALSE); ?B4QTx9B
if (pSysMenu != NULL) /9^0YC;Y*
{ xqZ%c/I3q
CString strAboutMenu; |?b"my$g$
strAboutMenu.LoadString(IDS_ABOUTBOX); s+t eYL#Zi
if (!strAboutMenu.IsEmpty()) F4l6PGxF&\
{ QU;C*}0Zl
pSysMenu->AppendMenu(MF_SEPARATOR); K&oO+ G^f
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K%@SS8!oy
} f3&//h8
} `SbX`a0p2
SetIcon(m_hIcon, TRUE); // Set big icon T$B4DQ
SetIcon(m_hIcon, FALSE); // Set small icon ~x\Q\Cxp
m_Key.SetCurSel(0); @WE$%dr
RegisterHotkey(); mM%BO(X{=
CMenu* pMenu=GetSystemMenu(FALSE); mT$tAwzTC{
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "N"k8,LH
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _Dt TG<E
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [vT,zM
return TRUE; // return TRUE unless you set the focus to a control #>oO[uaY
} ]8z6gDp
4vJIO{m
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +Uk.|@b=-V
{ U7'oI;C$e
if ((nID & 0xFFF0) == IDM_ABOUTBOX) wBGxJ\+M
{ u _^=]K;
CAboutDlg dlgAbout; bhT]zsBK
dlgAbout.DoModal(); 2UJ0%k
} : \`MrI^
else =l_"M
{ 1Tkdr2
CDialog::OnSysCommand(nID, lParam); {.)D)8`<d
} jC7XdYp
} 2}#PDhn
X28WQdP,7
void CCaptureDlg::OnPaint() 6u8fF|s
{ a
OHAG
if (IsIconic()) Darkj>$\
{
8eLL
CPaintDC dc(this); // device context for painting Y'R1\Go-
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5jk4k c
// Center icon in client rectangle .U
{JI\
int cxIcon = GetSystemMetrics(SM_CXICON); S-dV
int cyIcon = GetSystemMetrics(SM_CYICON); <H#K `|Ag
CRect rect; j3F=P
GetClientRect(&rect); *mtv[
int x = (rect.Width() - cxIcon + 1) / 2; r4zS, J;,
int y = (rect.Height() - cyIcon + 1) / 2; JC3)G/m(03
// Draw the icon (q7mzZY
dc.DrawIcon(x, y, m_hIcon); 9)X<}*(qo
} 4\RuJx
else )QT+;P.
{ r}bKVne
CDialog::OnPaint(); "+_0idpF
} tx-bzLo\
} osI(g'Xb
)2hoO_l:
HCURSOR CCaptureDlg::OnQueryDragIcon() wkw/AZ{27
{ tam/FzVw
return (HCURSOR) m_hIcon; 7Kjq1zl;
} 8tk`1E8!j
HDxw2nz*R
void CCaptureDlg::OnCancel() &*SnDuc
{ !ZdUW]
if(bTray) p:))ne:7
DeleteIcon(); |+''d
CDialog::OnCancel(); 06
1=pV$CJ
} QI<3N
WDR!e2G
void CCaptureDlg::OnAbout() "f+2_8%s+
{ \x}UjHYIc&
CAboutDlg dlg; GC2<K
dlg.DoModal(); 5#PhaVc
} =uTV\)
?i"FdpW
void CCaptureDlg::OnBrowse() pj6Cvq4bD
{ ~E~J*R Ze
CString str; ^DOcw@Z6HC
BROWSEINFO bi; FW,D\51pTP
char name[MAX_PATH]; Y@eUvz
ZeroMemory(&bi,sizeof(BROWSEINFO)); L&%iY7sC`
bi.hwndOwner=GetSafeHwnd(); HVpaVM
bi.pszDisplayName=name; 6h%(0=^
bi.lpszTitle="Select folder"; 4 vphLAm
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4{pa`o3
LPITEMIDLIST idl=SHBrowseForFolder(&bi); wr(?L7
$+
if(idl==NULL) |Rc#Q<Vh|
return; 0XNb@ogo
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &2J|v#$F
str.ReleaseBuffer(); 5[k35c{
m_Path=str; \;<Y/sg
if(str.GetAt(str.GetLength()-1)!='\\') DSp@
m_Path+="\\"; >%,tyJ~
UpdateData(FALSE); W#Z]mt B
} tK*f8X+q
^=j$~*(LmX
void CCaptureDlg::SaveBmp() lVHJ}(<'p
{ @Ia ~9yOY
CDC dc; 2_C.-;!
dc.CreateDC("DISPLAY",NULL,NULL,NULL); +Gko[<
CBitmap bm; 4(]k=c1<
int Width=GetSystemMetrics(SM_CXSCREEN); @U5o;X!qU
int Height=GetSystemMetrics(SM_CYSCREEN); fx},.P=:*
bm.CreateCompatibleBitmap(&dc,Width,Height); o\N}?Z,Kk
CDC tdc; Uan;}X7@
tdc.CreateCompatibleDC(&dc); (ydeZx
CBitmap*pOld=tdc.SelectObject(&bm); 4m:E:zVn
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YuZnuI@m9
tdc.SelectObject(pOld); @B6[RZ R
BITMAP btm; [sBD|P;M
bm.GetBitmap(&btm); _=b[b]Ec$s
DWORD size=btm.bmWidthBytes*btm.bmHeight; w# ['{GL
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); AF
!_!qc;
BITMAPINFOHEADER bih; sXTO`W/
bih.biBitCount=btm.bmBitsPixel; H{8\<E:V+}
bih.biClrImportant=0; smggr{-
bih.biClrUsed=0; tP9}:gu
bih.biCompression=0; ?a%
u=G
bih.biHeight=btm.bmHeight; ?(z3/"g]
bih.biPlanes=1; _kSus
bih.biSize=sizeof(BITMAPINFOHEADER); OA;L^d
bih.biSizeImage=size; =0Mmxd&o=M
bih.biWidth=btm.bmWidth; %Vq@WF
bih.biXPelsPerMeter=0; :BS`Q/<w
bih.biYPelsPerMeter=0; 7@\iBmr6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,aeFEsi
static int filecount=0; 4{TUoI6ii
CString name; rlq8J/0/+
name.Format("pict%04d.bmp",filecount++); .dV!d u
name=m_Path+name; 6O}r4*
BITMAPFILEHEADER bfh; c72/e7gV
bfh.bfReserved1=bfh.bfReserved2=0; c!c!;(
bfh.bfType=((WORD)('M'<< 8)|'B'); 3HD=)k
bfh.bfSize=54+size; s$Mj4_p3l
bfh.bfOffBits=54; 4s~o
CFile bf; 01J.XfCd6
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ H:`r!5&Qb5
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); V>hy5hDpH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F9hCT)
bf.WriteHuge(lpData,size); [ 6M8a8C
bf.Close(); L(L;z'3y
nCount++; /CP1mn6H
} :\ S3[(FV
GlobalFreePtr(lpData); iH2|w
if(nCount==1) {pqm&PB04
m_Number.Format("%d picture captured.",nCount); ^>>Naid
else ?Gb
18m
m_Number.Format("%d pictures captured.",nCount); li'#< "R?'
UpdateData(FALSE); =8]'/b
} +#O?sI#
ppxu\a
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I<$lpU_H
{ B}vI<?c
if(pMsg -> message == WM_KEYDOWN) q8U]Hyp(`
{ 5%9&
7
if(pMsg -> wParam == VK_ESCAPE) 'uh6?2)wG
return TRUE; iVD9MHT4
if(pMsg -> wParam == VK_RETURN) 5i0<BZDTef
return TRUE; fgNEq
} oD.f/hi0|
return CDialog::PreTranslateMessage(pMsg); wi!Ml4Sb
} 1\1o65en
TR#5V@e.m
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wFh{\
{ "*UHit;"+{
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t{$t3>p-t
SaveBmp(); j0Q;OKu
return FALSE; aw(P@9]
} T^"d%au
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ X{)M}WO+r
CMenu pop; aFLm,
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )%*uMuF
CMenu*pMenu=pop.GetSubMenu(0); #CM2FN:W
pMenu->SetDefaultItem(ID_EXITICON); `A#r6+
CPoint pt; e%8K
A#DX
GetCursorPos(&pt); rXA7<_V g
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u+hzCCwtR
if(id==ID_EXITICON) gbF.Q7?$u
DeleteIcon(); ,#<"VU2 bC
else if(id==ID_EXIT) MLUq"f~ N
OnCancel(); srUpG&Bcx
return FALSE; KnlVZn[3t
} WFtxEIrl3j
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )
~X\W\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) FX\ -Y$K
AddIcon(); Ehg5u'cj
return res; "xw2@jGpG
} -BR&b2
I9_tD@s"(
void CCaptureDlg::AddIcon() 0LxA+
{ -8g ;t3z
NOTIFYICONDATA data; *Bc=gl$
data.cbSize=sizeof(NOTIFYICONDATA); \07
s'W U
CString tip; NFsMc0{
tip.LoadString(IDS_ICONTIP); U1B5gjN
data.hIcon=GetIcon(0); a Z
^SK|E
data.hWnd=GetSafeHwnd(); QO0T<V
strcpy(data.szTip,tip); 9;kWuP>k4u
data.uCallbackMessage=IDM_SHELL; BB9Z?}
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ju+r@/y%
data.uID=98; JeuW/:Wv
Shell_NotifyIcon(NIM_ADD,&data); t[%9z6t
ShowWindow(SW_HIDE); wC;N*0Th
bTray=TRUE; Es1Yx\/:
} C^]bXIb
mq>Ag
void CCaptureDlg::DeleteIcon() 8&B{bS
{ -_v[oqf$
NOTIFYICONDATA data; ,:j^EDCsaJ
data.cbSize=sizeof(NOTIFYICONDATA); !ZHPR:k|
data.hWnd=GetSafeHwnd(); yin"+&<T
data.uID=98; -&y{8<bu4H
Shell_NotifyIcon(NIM_DELETE,&data); xqX~nV#TB
ShowWindow(SW_SHOW); @zW'!Ol
SetForegroundWindow(); *[k7KG2_U
ShowWindow(SW_SHOWNORMAL); yD$rls:v<
bTray=FALSE; USfOc
} r)q6^|~47
Xb5n;=)
void CCaptureDlg::OnChange() mq do@
{ tNoo3&
RegisterHotkey(); /EA4-#uw
} =&< s*-l[
&CG3_s<2
BOOL CCaptureDlg::RegisterHotkey() %BC*h}KGH
{ GjfY
UpdateData(); ?&j[Rj0pH
UCHAR mask=0;
JstX# z
UCHAR key=0; 6uOR0L
if(m_bControl) 0'% R@|
mask|=4; [_#9PH33
if(m_bAlt) O\-cLI<h2
mask|=2; _\1wLcFj
if(m_bShift) \&n]W\
mask|=1; <$K%u?
key=Key_Table[m_Key.GetCurSel()]; ;a*i*{\Rm
if(bRegistered){ T1LtO O
DeleteHotkey(GetSafeHwnd(),cKey,cMask); @I_A\ U{
bRegistered=FALSE; J#!:Z8b
} eOE7A'X
cMask=mask; P
BpjE}[Q
cKey=key; `[2nxP>w`
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0,{Dw9W:
return bRegistered; j"7 z
} L Lm{:T7
w%g@X6
四、小结 Q_x/e|sd
OXK?R\ E+
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。