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:
:~Z-K\ k+D"LA%J 一、实现方法
$gv3Up"U 7l~d_<h 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:
+[R,wsG &O:IRR7p #pragma data_seg("shareddata")
$k,wA8OZ- HHOOK hHook =NULL; //钩子句柄
8`{)1.d5[ UINT nHookCount =0; //挂接的程序数目
~g|Z6-?4Jj static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
5S
EyAhB static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
l
7XeZ} S static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
2.>WR~\ static int KeyCount =0;
$q
iY)RE static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
a^ __Z3g, #pragma data_seg()
;tZ;C(;< |K(2_Wp 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。
1[g -f, K|{IX^3)V 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:
iiw\ `u't BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
o^!_S5zKe. cKey,UCHAR cMask)
RZgklEU {
6VsgZ"Il BOOL bAdded=FALSE;
ye-EJDZN for(int index=0;index<MAX_KEY;index++){
A%[BCY_ if(hCallWnd[index]==0){
`Nnaw+<] hCallWnd[index]=hWnd;
4*D'zJsJ HotKey[index]=cKey;
L*QX21@wC HotKeyMask[index]=cMask;
0'3f^Ajf bAdded=TRUE;
~v$1@DQ} KeyCount++;
0{q>'dv break;
2:6W_[7l! }
s<XAH7?0 }
q9h3/uTv return bAdded;
S <RbC }
2&,jO+BqE@ //删除热键
2I@d=T{K BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Q:5^K {
mdtG W BOOL bRemoved=FALSE;
Xv&&U@7 for(int index=0;index<MAX_KEY;index++){
<l.l6okp if(hCallWnd[index]==hWnd){
[qL{w&R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kF@Z4MB}yr hCallWnd[index]=NULL;
Km)VOX[ZZ HotKey[index]=0;
cEK<CV HotKeyMask[index]=0;
mM $|cge" bRemoved=TRUE;
sP'U9l KeyCount--;
AbExJ~JV\g break;
\2c3Nsra }
7G\a5 }
E
xls_oSp }
28!
ke return bRemoved;
s?5vJ:M
Xr }
]J(BaX4 lZr}F.7 3-PqUJT$ DLL中的钩子函数如下:
z|$M,?r' m4r<=o LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Dx5X6 t9= {
M/mm2?4 BOOL bProcessed=FALSE;
`w_%HVw>" if(HC_ACTION==nCode)
zCe[+F {
\V_Tc` if((lParam&0xc0000000)==0xc0000000){// 有键松开
PU2^4h/[` switch(wParam)
o}p^q:T* {
gWu<5Y=C case VK_MENU:
Bc*FH>E MaskBits&=~ALTBIT;
QMhvyzkS break;
"OO)m](w case VK_CONTROL:
II'"Nkxd MaskBits&=~CTRLBIT;
fjd)/Gg break;
0 L$[w case VK_SHIFT:
S0'
ACt` MaskBits&=~SHIFTBIT;
Ntt*}|:QV< break;
FTQNS8 default: //judge the key and send message
M-8`zA2 break;
*6bO2LO" }
vk4Q2P for(int index=0;index<MAX_KEY;index++){
G`Df'Yy if(hCallWnd[index]==NULL)
'N3)>!Y:8 continue;
% aqP{mOO if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|JLXgwML {
q|g>;_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l86gs6> bProcessed=TRUE;
bs&>QsI?j }
Nl'@Y^8N }
we/sv9v}n }
`k6ZAOQtX else if((lParam&0xc000ffff)==1){ //有键按下
p/U{*i]t switch(wParam)
.>a
[ {
NZ"nG<;5 case VK_MENU:
P?ms^ MaskBits|=ALTBIT;
Rc vp@ break;
Am!OLGG4 case VK_CONTROL:
ka_(8 MaskBits|=CTRLBIT;
c;Gf$9?iC break;
GO)5R, case VK_SHIFT:
b]gVZ- MaskBits|=SHIFTBIT;
bE;c&g break;
TI|h default: //judge the key and send message
3yrb7Rn3 break;
SLW|)Q24 }
E)`:sSd9 for(int index=0;index<MAX_KEY;index++){
5P{[8PZxbV if(hCallWnd[index]==NULL)
?C`r3 continue;
`&9iC 4P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
v5\5:b{/ {
:8`~dj. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N%F4ug@i bProcessed=TRUE;
(6Ciqf8 }
DNr*|A2< }
"AP$)xM-: }
~F^tLi!5 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
e%lxRN"b for(int index=0;index<MAX_KEY;index++){
u].7+{
if(hCallWnd[index]==NULL)
fx-8mf3 continue;
S Rk%BJ? ~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
pm=m~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\zcR75 //lParam的意义可看MSDN中WM_KEYDOWN部分
*M)M!jTv }
{;N2 &S o }
s"XwO8yhM }
/xSFW7d1 return CallNextHookEx( hHook, nCode, wParam, lParam );
= N;5T }
K3Bw3j 9 d%UzQ*s 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:
+0?1"2 ez5J+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1F_$[iIX] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
S:XsO9:{ Gr 4v&Mz: 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:
):[}NDmC &)jq3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
L6ap|u {
ah%Ws#& if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
XF+4*), {
eyuyaSE //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
9a @rsyX SaveBmp();
5rmU9L return FALSE;
:}yT?LIyP }
$}AbR:z …… //其它处理及默认处理
1BEs> Sm }
IJ~j(.W !Sw=ns7 M!kSt1 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。
1+gF fKq sPG500=) 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。
r
^\(M
{ |Iw glb!k 二、编程步骤
LRg]'? t>AOF\ 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";
ZSs@9ej `KN>0R2k 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
3%bhW9H% $btu=_|f 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;
0QT:@v2R i!RfUod 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;
7FJ4;HLQ /y$ Fw9R; 5、 添加代码,编译运行程序。
2lO(f+ 641P) 三、程序代码
Av?R6 i%JJ+9N ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
aG83@ABx #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
.1q}mw #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
vc&v+5Y #if _MSC_VER > 1000
/OWwC%tM/ #pragma once
Scx!h. \5 #endif // _MSC_VER > 1000
p0WUF\" #ifndef __AFXWIN_H__
p<{P#?4 g #error include 'stdafx.h' before including this file for PCH
E]rXp~AZm #endif
5 ty2e`~K #include "resource.h" // main symbols
F3EAjO)ch class CHookApp : public CWinApp
@lF?+/=$ {
Q"ZpT public:
4~&3.1 CHookApp();
}%8ZN : // Overrides
vX\9#Hj // ClassWizard generated virtual function overrides
QM#Vl19>j( //{{AFX_VIRTUAL(CHookApp)
uE41"?GS public:
u\Ylo.)b virtual BOOL InitInstance();
9xO@_pkX virtual int ExitInstance();
@<{%r //}}AFX_VIRTUAL
Sz@z
0' //{{AFX_MSG(CHookApp)
Xg96I:r'p // NOTE - the ClassWizard will add and remove member functions here.
@t~y9UfF // DO NOT EDIT what you see in these blocks of generated code !
S)rr //}}AFX_MSG
Q{|%kU" DECLARE_MESSAGE_MAP()
W06#|8,{v };
X2@Ef2EkM LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
C[<}eD4bV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gns}%\, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
9gcW; BOOL InitHotkey();
xy7A^7Li BOOL UnInit();
)b #5rQ #endif
B`Z3e%g# Tc/^h4xH //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
JI[8n$pr] #include "stdafx.h"
!i) !|9e #include "hook.h"
1hY| XZ%qd #include <windowsx.h>
iR nj N #ifdef _DEBUG
qC> tni% #define new DEBUG_NEW
O hk\P;} #undef THIS_FILE
`P;r[j" static char THIS_FILE[] = __FILE__;
RJ'[m~yl5X #endif
#\w N2`" W #define MAX_KEY 100
@W>@6E #define CTRLBIT 0x04
(vO3vCYeQ #define ALTBIT 0x02
iHGVR #define SHIFTBIT 0x01
ng3ZK #pragma data_seg("shareddata")
"00j]e. HHOOK hHook =NULL;
<#h,_WP* UINT nHookCount =0;
;
R}>SS' static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
k_,7#:+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Xx{| [2` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^x\VMd3*w static int KeyCount =0;
}ouGxs+^[ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
f%,S::%Ea #pragma data_seg()
]
#@:VR HINSTANCE hins;
/e0B$UymFu void VerifyWindow();
E:x@O8F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
(p[#[CI9 //{{AFX_MSG_MAP(CHookApp)
n?fy@R // NOTE - the ClassWizard will add and remove mapping macros here.
YCD|lL# // DO NOT EDIT what you see in these blocks of generated code!
?>h
~"D# //}}AFX_MSG_MAP
[t?tLUg|6 END_MESSAGE_MAP()
x
vs=T $Y|OGZH8E CHookApp::CHookApp()
_d@YLd78P {
tTy !o= // TODO: add construction code here,
T]De{nH u // Place all significant initialization in InitInstance
R'k`0 }
vTK%4=|1}! ~#sD2b`0 CHookApp theApp;
/aI@2] |~ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B-MS@<2 {
&u2;S?7m BOOL bProcessed=FALSE;
]eKuR"ob0 if(HC_ACTION==nCode)
uCDe>Q4@/ {
uvbVb"\"Yk if((lParam&0xc0000000)==0xc0000000){// Key up
r%.k,FzGZY switch(wParam)
['IH*gi {
7
~~ug case VK_MENU:
O`@Nl MaskBits&=~ALTBIT;
@ b!]Jw break;
]@#9B>v= case VK_CONTROL:
tP@NQCo MaskBits&=~CTRLBIT;
D.a>i?W break;
y0d= case VK_SHIFT:
#hxYB MaskBits&=~SHIFTBIT;
g{Hgs break;
kEDpF26! default: //judge the key and send message
_eKO:Y[e break;
*]]Zpa6 }
spV7\Gs.@ for(int index=0;index<MAX_KEY;index++){
j L|6i-?! if(hCallWnd[index]==NULL)
.g8*K " continue;
n5$#M if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z~J]I|R: {
hTtn
/j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ai_ve[A bProcessed=TRUE;
zKd@Ab }
FH=2,"A }
KW .4 9 }
aJ+V]WmA else if((lParam&0xc000ffff)==1){ //Key down
3YvKHn|V" switch(wParam)
v$]B;;[A {
O-(V`BZe case VK_MENU:
0nb%+],pX MaskBits|=ALTBIT;
nQiZ6[L break;
w5%Yi{ case VK_CONTROL:
D~C'1C&W MaskBits|=CTRLBIT;
ab6I*DbF break;
[J,.?'V case VK_SHIFT:
zS%XmS\ MaskBits|=SHIFTBIT;
<F7a!$zQ break;
\4N8-GwZQ default: //judge the key and send message
)pHtsd. eP break;
g6,D Bkv2 }
O&l4/RtQ\) for(int index=0;index<MAX_KEY;index++)
l!tR<$| {
M6g8+ sio if(hCallWnd[index]==NULL)
1@|+l!rYF continue;
A8m06 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pQiC#4b {
7X>IS#W] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
X!]v4ma` bProcessed=TRUE;
u}5CzV ` }
hP"2X"kz& }
&D<R;>iI }
;XN|dq if(!bProcessed){
Af _4Z]F
for(int index=0;index<MAX_KEY;index++){
QHNyH if(hCallWnd[index]==NULL)
Tc^
0W=h continue;
:F:1(FDP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?h}NL5a SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RDdnOzx }
GL
n M1 }
:c/54Ss~ }
|N&t return CallNextHookEx( hHook, nCode, wParam, lParam );
2z-Nw <bA }
:{%[6lE^G 4zyQ "?A~ BOOL InitHotkey()
B\Nbt!Ps {
_*o<<C\E if(hHook!=NULL){
>5FTBe[D nHookCount++;
'I$FOH return TRUE;
8US#SI'x }
njs: else
t%}<S~" hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
.iy4
(P4 if(hHook!=NULL)
H,(vTthd nHookCount++;
`Z;Z^c return (hHook!=NULL);
q A .9X4NQ }
NxHUOPAJc BOOL UnInit()
/yI4;:/ {
O*~,L6# } if(nHookCount>1){
=|?`5!A nHookCount--;
#^T`vTD- return TRUE;
wMVUTm }
zH]oAu=H BOOL unhooked = UnhookWindowsHookEx(hHook);
KfiSQ!{ if(unhooked==TRUE){
&>\;4E.O5 nHookCount=0;
pCE
GZV,d@ hHook=NULL;
`58% &3lp }
+?*;#=q return unhooked;
W![K#r5T }
E
f\|3D_ KqGb+N-@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h*fN]k6 {
*Ypn@YpSp BOOL bAdded=FALSE;
_KM?
?& for(int index=0;index<MAX_KEY;index++){
]d1'5F][H if(hCallWnd[index]==0){
Ih.+-!w hCallWnd[index]=hWnd;
0"R>:f} HotKey[index]=cKey;
B'yjMY![
HotKeyMask[index]=cMask;
M{jXo%C bAdded=TRUE;
M_E,pg=rWI KeyCount++;
H,%bKl# break;
(%B{=w}8 }
_pTcSp3 }
Jw]!x1rF~ return bAdded;
!,`'VQw$ }
T1d@=&0" )V1xL_hx/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)k(K/m {
F+hV'{|w` BOOL bRemoved=FALSE;
6\7c: for(int index=0;index<MAX_KEY;index++){
FsED9+/m if(hCallWnd[index]==hWnd){
PLz{EQ[cV if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
hQ|mow@Zmz hCallWnd[index]=NULL;
}+!"mJx@ HotKey[index]=0;
IH`Q=Pj HotKeyMask[index]=0;
Cu+p!hV bRemoved=TRUE;
@6"MhF KeyCount--;
Ge2Klyi break;
TDo)8+.2z }
ZH
Q?{" }
)Eozo4~ }
0T`Qoo>u return bRemoved;
-YQh
F;/ }
T~xVHk1 2'fd4rE5 void VerifyWindow()
+^BThrB {
8w:ay,= for(int i=0;i<MAX_KEY;i++){
~<_#%R! if(hCallWnd
!=NULL){ cP?GRMX@}
if(!IsWindow(hCallWnd)){ @}q, ';H7
hCallWnd=NULL; Pl B3"{}0Q
HotKey=0; ZjxF@`H
HotKeyMask=0;
LgF?1?
KeyCount--; Nw. )O
} &4OJJ9S
} b:S$oE
} T:Cq}4k<
} p7YYAh@x\
.!4'Y}
BOOL CHookApp::InitInstance() 2Z{?3mAb;
{ `<tRfl}qs
AFX_MANAGE_STATE(AfxGetStaticModuleState()); h{)m}"n<R
hins=AfxGetInstanceHandle(); zLl-{Kk
InitHotkey(); ]|3hK/
return CWinApp::InitInstance(); U
'{PpZ
} o+|>D&CW%
[k
7HLn)
int CHookApp::ExitInstance() sK%b16#
{ Vs"b
VerifyWindow(); HB )+.e
UnInit(); ]C^ #)7
return CWinApp::ExitInstance(); XuP%/\
} 4S42h_9
=Z.0-C>W
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {mU%.5
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W7!Rf7TK
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Py*WHHO
#if _MSC_VER > 1000 eztK`_n
#pragma once 2(d
#endif // _MSC_VER > 1000 T}!9T!(HdF
q&:7R
.Ci
class CCaptureDlg : public CDialog BZ\="N#f
{ ZW?h\0Hh
// Construction d>Tv?'o`q
public: q!W,2xqZoq
BOOL bTray; \Hb!<mrp
BOOL bRegistered; :NLY;B`
BOOL RegisterHotkey(); .J -k^+-
UCHAR cKey; N%Bl+7,q
UCHAR cMask; NzZ(Nz5
void DeleteIcon(); ,xU#uyB
void AddIcon(); -|'@:cIZ
UINT nCount; :'r*
5EX
void SaveBmp(); &7'=t6
CCaptureDlg(CWnd* pParent = NULL); // standard constructor i@:^b_
// Dialog Data JX'}+.\
//{{AFX_DATA(CCaptureDlg) J-+mdA
enum { IDD = IDD_CAPTURE_DIALOG }; X#T|.mCdC
CComboBox m_Key; Jm ,:6T
BOOL m_bControl; 1a9' *[
BOOL m_bAlt; -)%\$z
BOOL m_bShift; Sck!w 3
CString m_Path; 6Zpa[,gm
CString m_Number; W.4R+kF<
//}}AFX_DATA P_b5`e0O
// ClassWizard generated virtual function overrides iAe"oXK|
//{{AFX_VIRTUAL(CCaptureDlg) y
a$yRsd`
public: \@PMj"p|:
virtual BOOL PreTranslateMessage(MSG* pMsg); JAHmmNlW
protected: ]+G\1SN~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nGGw(6c%>
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); P[aE3Felk
//}}AFX_VIRTUAL )*%uG{h
// Implementation 4r;le5@
protected: iOm&(2/
HICON m_hIcon; \u.5_
g
// Generated message map functions 8]&Fu3M^
//{{AFX_MSG(CCaptureDlg) b w1s?_P
virtual BOOL OnInitDialog(); bBINjs8C_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o?O ZsA
afx_msg void OnPaint(); #}.{|'L
afx_msg HCURSOR OnQueryDragIcon(); .\H-?6R^
virtual void OnCancel(); 8r}tf3xMCM
afx_msg void OnAbout(); &pl)E$Y
afx_msg void OnBrowse(); ]l }v
afx_msg void OnChange(); ;xq;c\N
//}}AFX_MSG 0Runex[
DECLARE_MESSAGE_MAP() MuO(%.H
}; B_#M)d
O
#endif qKXg'1#E)
Y<^Or
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l
#include "stdafx.h" ?b d&Av
#include "Capture.h" 4Tuh]5
#include "CaptureDlg.h" ?`vGpi~
#include <windowsx.h> D0\*WK$
#pragma comment(lib,"hook.lib") [)}`w;#
#ifdef _DEBUG :V"e+I
#define new DEBUG_NEW W SvhC
#undef THIS_FILE "pX|?ap
static char THIS_FILE[] = __FILE__; ci%$So2#
#endif -=
c&K&
#define IDM_SHELL WM_USER+1 NWwKp?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %b
pQ=
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hj-n
'XZ
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PtPx(R3
class CAboutDlg : public CDialog !*^+7M
{ aa]|
public: Lz9|"F"V
CAboutDlg(); &iuMB0rbu
// Dialog Data -iy17$
//{{AFX_DATA(CAboutDlg) !
.Pbbs%
enum { IDD = IDD_ABOUTBOX }; *` -
//}}AFX_DATA Yh,,(V6
// ClassWizard generated virtual function overrides &6GW9pl[
//{{AFX_VIRTUAL(CAboutDlg) m{*_%tjN0
protected: iMYJVB=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )fuAdG
//}}AFX_VIRTUAL abe5 As r
// Implementation ^~B#r#
protected: A;xH{vo{
//{{AFX_MSG(CAboutDlg) ;[C_ho
//}}AFX_MSG BN`tiPNEp
DECLARE_MESSAGE_MAP() G #$r)S
}; N+UBXhh
n Fwg pT
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) w$qdV,s 7
{ Fyz1LOH[X
//{{AFX_DATA_INIT(CAboutDlg) HlxgJw~<
//}}AFX_DATA_INIT !{r@ H+Kf
} it j&L <e
H8Ra !FW@
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rb.:(d)T
{ fn//j7 j
CDialog::DoDataExchange(pDX); #cl|5jm+m#
//{{AFX_DATA_MAP(CAboutDlg) :2t?0YR
//}}AFX_DATA_MAP 1OFrxSg
} R,hwn2@B
K?S5C8
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RLh%Y>w
//{{AFX_MSG_MAP(CAboutDlg) b5
AP{
#
// No message handlers :Mu]*N
//}}AFX_MSG_MAP !&G&
~*.x
END_MESSAGE_MAP() )P W Zc?M
P#KTlH
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) St3/mDtH
: CDialog(CCaptureDlg::IDD, pParent) pr\OjpvD
{ G7#<Jo<8
//{{AFX_DATA_INIT(CCaptureDlg) mj& 4FQ#O*
m_bControl = FALSE; ,Igd<A=
m_bAlt = FALSE; !M7727
m_bShift = FALSE; 2reQd47
m_Path = _T("c:\\"); FPAj}as
m_Number = _T("0 picture captured."); DoEN`K\U
nCount=0; GZiN&}5e
bRegistered=FALSE; >
8!9
bTray=FALSE; Qv;^nj{\qV
//}}AFX_DATA_INIT dr=h;[Q'
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ' '|R$9\@
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /n9,XD&)
} 4:s!mHcz
4^w`]m
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 78zwu<ET
{ mk`#\=GE
CDialog::DoDataExchange(pDX); $gcC}tX
//{{AFX_DATA_MAP(CCaptureDlg) Hc-68]T
DDX_Control(pDX, IDC_KEY, m_Key); fXx !_Z
DDX_Check(pDX, IDC_CONTROL, m_bControl); G8CM
DDX_Check(pDX, IDC_ALT, m_bAlt); Q[% +y.
DDX_Check(pDX, IDC_SHIFT, m_bShift); FHyyZ{"
DDX_Text(pDX, IDC_PATH, m_Path); m@c\<-P
DDX_Text(pDX, IDC_NUMBER, m_Number); Cbr>\;sc2Z
//}}AFX_DATA_MAP *46hw(L
} K1|xatx1V
68a
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7,D6RP(b
//{{AFX_MSG_MAP(CCaptureDlg) FJ
V!B&
ON_WM_SYSCOMMAND() .5YW>P V
ON_WM_PAINT() 8CGjI?j
ON_WM_QUERYDRAGICON() v?#W/].C+
ON_BN_CLICKED(ID_ABOUT, OnAbout) ~i9'9PHX@
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) /-C6I:
ON_BN_CLICKED(ID_CHANGE, OnChange)
5wy3C
//}}AFX_MSG_MAP +J(@.
END_MESSAGE_MAP() L=-v>YL+
#BwkbOgr
BOOL CCaptureDlg::OnInitDialog() {-e|x&-
{ ~g|z7o
CDialog::OnInitDialog(); ^@AIXBe
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U=\!`_f':
ASSERT(IDM_ABOUTBOX < 0xF000); <(dg^;
CMenu* pSysMenu = GetSystemMenu(FALSE); LRmH@-qP
if (pSysMenu != NULL) Jhr3[A
{ f-l(H="e
CString strAboutMenu; z+qrsT/?L
strAboutMenu.LoadString(IDS_ABOUTBOX); ~{gV`nm=J
if (!strAboutMenu.IsEmpty()) D eM/B5qw
{ .l ufE
pSysMenu->AppendMenu(MF_SEPARATOR); )Uu! x6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Pa\"l'!>^
} Ld:U~M-
} _';oT*#
SetIcon(m_hIcon, TRUE); // Set big icon Tn 3<cO7v
SetIcon(m_hIcon, FALSE); // Set small icon B|6_4ry0U
m_Key.SetCurSel(0); -jQMh
RegisterHotkey(); U8R*i7
CMenu* pMenu=GetSystemMenu(FALSE); 3YOYlb %j
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )l"py9STF
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t7qY!S (
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4n,>EA85
return TRUE; // return TRUE unless you set the focus to a control ubQZTA x
} {S5HH"
*B1%-
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7c
aV-8:
{ x72T5.
if ((nID & 0xFFF0) == IDM_ABOUTBOX) M7g6m
{ %[H|3
CAboutDlg dlgAbout; kB $?A8Olu
dlgAbout.DoModal(); UbSAyf
} )r.4`5Rc
else Ht=h9}x"g
{ LP-_i}Kq
CDialog::OnSysCommand(nID, lParam); /#xx,?~xx0
} 55#s/`gd)^
} wwD?i.3
-"MB(`
void CCaptureDlg::OnPaint() x|`o7.
{ Rt2<F-gY
if (IsIconic()) ;@l5kdZx`
{ On4tK\l@
CPaintDC dc(this); // device context for painting >,)tRQS
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N9=1<{Z
// Center icon in client rectangle i"J`$u
int cxIcon = GetSystemMetrics(SM_CXICON); 1a>TJdoa
int cyIcon = GetSystemMetrics(SM_CYICON); X|Z2"*;b`
CRect rect; p`2w\P3;)
GetClientRect(&rect); ^L"ENsOs
int x = (rect.Width() - cxIcon + 1) / 2; "-aCF
int y = (rect.Height() - cyIcon + 1) / 2; <9jN4hV
// Draw the icon B #zU'G*Y
dc.DrawIcon(x, y, m_hIcon); sbV
{RSl
} $PE{}`#g
else sxFkpf_h
{ \:@yfI@
CDialog::OnPaint(); 4fa2_
} :#&Y
} 0$A7"^]
<Gkmk?x`A
HCURSOR CCaptureDlg::OnQueryDragIcon() 1NQstmd{
{ ~|5B
return (HCURSOR) m_hIcon; S@[B?sNj
} deVbNg8gs
s%l`XW;v
void CCaptureDlg::OnCancel() }Z Nyd
{ (Ceq@eAlT
if(bTray) t0-)\kXcA
DeleteIcon(); QdtGFY4f,
CDialog::OnCancel(); Os>^z@x
} L92vb zP
a15kFun
void CCaptureDlg::OnAbout() =LHz[dSL
{ q6a7o=BP]
CAboutDlg dlg; h<I C
d'!
dlg.DoModal(); .R5(k'g?
} M:QM*?+)
K! I]0!:
void CCaptureDlg::OnBrowse() ,ctm;T1H+
{ 5KI lU78
CString str; Cr#Z.
BROWSEINFO bi; Kp)H>~cL
char name[MAX_PATH]; .Qz412
ZeroMemory(&bi,sizeof(BROWSEINFO)); |fhYft
bi.hwndOwner=GetSafeHwnd(); fNnX{Wq
bi.pszDisplayName=name; V4>qR{5
bi.lpszTitle="Select folder"; W&`{3L
bi.ulFlags=BIF_RETURNONLYFSDIRS; k^C^.[?
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ll8Zo+-[
if(idl==NULL) (dgBI}Za
return; F\IJim-Rh
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (`me}8
str.ReleaseBuffer(); 09L"~:rg
m_Path=str; yZcnky
if(str.GetAt(str.GetLength()-1)!='\\') bji^b@us_
m_Path+="\\"; Wi%e9r{hU
UpdateData(FALSE); 6#za\[
} tTcff9ee
q88;{?T1
void CCaptureDlg::SaveBmp() SL ) ope
{ ;VW->ia6
CDC dc; <7R+p;y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8LH\a.>
CBitmap bm; Cyu= c1D ;
int Width=GetSystemMetrics(SM_CXSCREEN); N6UPD11}6
int Height=GetSystemMetrics(SM_CYSCREEN); >pRC$'Usx
bm.CreateCompatibleBitmap(&dc,Width,Height); jhF&
CDC tdc; &@rXt!
tdc.CreateCompatibleDC(&dc); B57MzIZi]
CBitmap*pOld=tdc.SelectObject(&bm); xixdv{M<FF
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2.PZtl
tdc.SelectObject(pOld); _6!@>`u~
BITMAP btm; ScCA8JgY
bm.GetBitmap(&btm); <TQ,7M4X
DWORD size=btm.bmWidthBytes*btm.bmHeight; c%x9.s<+1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,6AnuA
BITMAPINFOHEADER bih; @/f'i9?oM`
bih.biBitCount=btm.bmBitsPixel; /{71JqFis
bih.biClrImportant=0; -XNawpl`
bih.biClrUsed=0; _-c1" Kl
bih.biCompression=0; MR3\7D+9y
bih.biHeight=btm.bmHeight; 7GG:1:2+>
bih.biPlanes=1; +L
U.QI'
bih.biSize=sizeof(BITMAPINFOHEADER); YHQvx_0yP
bih.biSizeImage=size; >_'0 s
bih.biWidth=btm.bmWidth; /C\tJs
bih.biXPelsPerMeter=0; ~`c(7
bih.biYPelsPerMeter=0; ?(R!BB
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =V>inH
static int filecount=0; )1, U~+JFU
CString name; wT>~7$=L{
name.Format("pict%04d.bmp",filecount++); ec3zoKtV
name=m_Path+name; `W9~u: F
BITMAPFILEHEADER bfh; f(UB$^4
bfh.bfReserved1=bfh.bfReserved2=0; HnsPXF'8g
bfh.bfType=((WORD)('M'<< 8)|'B'); "[
#.
bfh.bfSize=54+size; $eiW2@
bfh.bfOffBits=54; !=bGU= ^
CFile bf; u?7^+z
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =)YDjd_=z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VKMgcfbHr/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1EAQ ~S!2
bf.WriteHuge(lpData,size); 8Ao-m38
bf.Close(); 7xh91EU:4
nCount++; <IO@Qj1*
} FxdWJ|rN9D
GlobalFreePtr(lpData); 9 .18E(-
if(nCount==1) 51gSbkVX
m_Number.Format("%d picture captured.",nCount); rd1EA|T
else Hj97&C{Q^
m_Number.Format("%d pictures captured.",nCount); \N[2-;[3
UpdateData(FALSE); K,5_{pj
} ?*L{xNC#
Plj >+XRO
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) XImX1GH
{ j.kv!;Rj=
if(pMsg -> message == WM_KEYDOWN) p1!-|Sqq
{ D%~"]WnZ\Q
if(pMsg -> wParam == VK_ESCAPE) sv)4e)1
return TRUE; LZ}m;
if(pMsg -> wParam == VK_RETURN) h!J|4Qa
return TRUE; 7* R
%zJ
} tSVU,m
return CDialog::PreTranslateMessage(pMsg); {HbSty
} IC:>60A,]
G#YBfPmr
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ia j`u
{ h{ T{3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oq9gFJG(
SaveBmp();
N<~LgH
return FALSE; =wznkqyhi
} B|ctauJ
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p]rV\,Yss
CMenu pop; 3?Fe(!@
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); -,q
qQf
CMenu*pMenu=pop.GetSubMenu(0); sL)7MtNwy
pMenu->SetDefaultItem(ID_EXITICON); }CM#jN?(
CPoint pt; %$'Z"njO&
GetCursorPos(&pt); @k9n 0Qe|F
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KEjMxOv1
if(id==ID_EXITICON) 8Om4G]*|,
DeleteIcon(); PIHKSAnq
else if(id==ID_EXIT) [&pMU)
OnCancel(); _'Rg7zHTp-
return FALSE; } 8[
} M^{=&
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xg;vQKS6
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /h 4rW>8D2
AddIcon(); yp]z@SYA@
return res; LcTTfb+<
} ]JQ}9"p=5
=g |5VXW5
void CCaptureDlg::AddIcon() {hoe^07XK
{ 5a|{ytP
NOTIFYICONDATA data; @$1jp4c
data.cbSize=sizeof(NOTIFYICONDATA); V ;"Rp-`^
CString tip; {g 4`>^;
tip.LoadString(IDS_ICONTIP); pP%9MSCi
data.hIcon=GetIcon(0); nd"$gi
data.hWnd=GetSafeHwnd(); w\a6ga!xt"
strcpy(data.szTip,tip); =w7+Yt
data.uCallbackMessage=IDM_SHELL; vr4{|5M
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xAr&sGMA
data.uID=98; NInZ~4:
Shell_NotifyIcon(NIM_ADD,&data); p\Fxt1Y@X
ShowWindow(SW_HIDE); _k#!^AJ}x
bTray=TRUE; S8O,{
} Ec&_&
B &
]GGy
void CCaptureDlg::DeleteIcon() 0nZQ"{x
{ ,I
H~
NOTIFYICONDATA data; k\Y*tY#2
data.cbSize=sizeof(NOTIFYICONDATA); : . PRM+
data.hWnd=GetSafeHwnd(); XB]>Z)
data.uID=98; ,z#S=I
Shell_NotifyIcon(NIM_DELETE,&data); Cx&l0ZXHEX
ShowWindow(SW_SHOW); yIg^iZD
SetForegroundWindow(); h-\Ov{~
ShowWindow(SW_SHOWNORMAL); 7bQST0 ?
bTray=FALSE; qL5~Wr m-W
} `A<2wd;
,[<$X{9
void CCaptureDlg::OnChange() zm3$)*p1
{ S
R s
RegisterHotkey(); vy-q<6T}:p
} rdsZ[ii
i:Gyi([C
BOOL CCaptureDlg::RegisterHotkey() BS%pS(
{ LtPaTe
UpdateData(); Rh%@N.Z*
UCHAR mask=0; ^fE8|/]nG9
UCHAR key=0; @}pcj2K#
if(m_bControl) ;]k\F
mask|=4; $4Dr +Z
H
if(m_bAlt) Jp=
)L
mask|=2; Vi>P =i
if(m_bShift) 4'td6F
mask|=1; 53>(2 _/[r
key=Key_Table[m_Key.GetCurSel()]; *BvdL:t
if(bRegistered){ {^k7}`7,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5s@xpWVot
bRegistered=FALSE; RKp9[^/?
}
WJ,? 5#
cMask=mask; p)VMYu
cKey=key; O:ACp<@
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); O*lE0~rJ
return bRegistered; v]rbm}uU9
} (M<l}pl)
cj[x%eK>
四、小结 y6Ez.$M
dKhS;!K9p
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。