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:
3/rvSR!
paBGJ~{= 一、实现方法
L7Oytdc< /#G"'U/ 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:
{t/!a0\HS 9_>4~!x` #pragma data_seg("shareddata")
.`'SL''c HHOOK hHook =NULL; //钩子句柄
T4!]^_t^ UINT nHookCount =0; //挂接的程序数目
NuO>zAu static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
<uTsXv static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
C-Fp)Zs{0 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'*,4F' static int KeyCount =0;
8]?1gDS|9O static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
W=EO=}l# #pragma data_seg()
UiZ61lw Gm2rjpZeq 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。
UdI>x 4bI DpS6>$v8t DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
omjLQp[% ONjc},_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
O[L8(+Sn cKey,UCHAR cMask)
'6 'XBL? {
{hg$?4IyQ BOOL bAdded=FALSE;
c&Zm>Qo[
for(int index=0;index<MAX_KEY;index++){
g?$9~/h :; if(hCallWnd[index]==0){
}"&(sYQ*` hCallWnd[index]=hWnd;
Ro1' L1: HotKey[index]=cKey;
^,KR 0 HotKeyMask[index]=cMask;
FoG<$9 bAdded=TRUE;
5nj~RUK KeyCount++;
b<( W}$x break;
zBs7]z!eP }
W"-nzdAJ5 }
KncoIw return bAdded;
'j)eqoj }
D1Sl+NOV //删除热键
'j3'n0o BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
P~qVr#eU {
&"kx(B BOOL bRemoved=FALSE;
0 j.Sb2 for(int index=0;index<MAX_KEY;index++){
JZXc1R| 9 if(hCallWnd[index]==hWnd){
Ksp;bfe if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$Tur"_`I; hCallWnd[index]=NULL;
j d81E HotKey[index]=0;
W_
6Jl5] HotKeyMask[index]=0;
7}x-({bqy bRemoved=TRUE;
>@L
HJ61C KeyCount--;
h@DJ/&;u@ break;
|@g1|OWd| }
lhI;K4# }
sR9F: }
~/x42|t return bRemoved;
P&tK}Se^V }
"QF083$ ;dFe >`~ Ax^'unfQ: DLL中的钩子函数如下:
Ji!-G4.n" 1%@~J\qF LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Qm.kXlsDI {
0\#Q;Z2 BOOL bProcessed=FALSE;
% *G)*n if(HC_ACTION==nCode)
lewDR"0Kx {
'AAY!{> if((lParam&0xc0000000)==0xc0000000){// 有键松开
f5a](& switch(wParam)
Xp~]kRm9 {
;gMh]$|" case VK_MENU:
"P{&UwMmh MaskBits&=~ALTBIT;
u
.2sB6} break;
W$JA4O>b case VK_CONTROL:
'MUrszOO.e MaskBits&=~CTRLBIT;
qc6IH9i` break;
dc>y7$2 case VK_SHIFT:
itF+6wv~ MaskBits&=~SHIFTBIT;
?W
n(ciO break;
:65HMWy. default: //judge the key and send message
f$>orVm%. break;
m#nxw }
cBI)? for(int index=0;index<MAX_KEY;index++){
2 QmUg if(hCallWnd[index]==NULL)
]p!J]YV ]0 continue;
i4I0oRp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
MP,*W}@ {
2jW>uk4/i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{Pb^Lf > bProcessed=TRUE;
Flxo%g}; }
`0^i
# }
Ng"vBycy }
i-?zwVmn else if((lParam&0xc000ffff)==1){ //有键按下
@;6}xO2 switch(wParam)
cWc)sb {
$P(nh'\ case VK_MENU:
]CZLaID~
MaskBits|=ALTBIT;
S
|x)7NC break;
BB.TrQM.# case VK_CONTROL:
a+/|O*># MaskBits|=CTRLBIT;
X6.O; break;
:xPvEK[B7 case VK_SHIFT:
TyWy5J<
:+ MaskBits|=SHIFTBIT;
]uvbQ.l_t break;
r(i)9RI+( default: //judge the key and send message
4c=kT@=jX break;
(@E#O$' }
"Cc"y* P for(int index=0;index<MAX_KEY;index++){
S7a6ntei if(hCallWnd[index]==NULL)
C):d9OI? continue;
y^=oYL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*?D2gaCta {
3~</lAm; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%5*#c*)R bProcessed=TRUE;
> bF!Y]H }
<S$21NtM87 }
{0e{!v }
~It+|X=Kx if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
M:M>@|) for(int index=0;index<MAX_KEY;index++){
A{2$hKqHi if(hCallWnd[index]==NULL)
txo?k/w continue;
vB5iG|b} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+&,\ J9'B SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
PAwg&._K //lParam的意义可看MSDN中WM_KEYDOWN部分
[T]qm7
? }
MNqyEc"" }
g
u =fq\` }
\hW73a! return CallNextHookEx( hHook, nCode, wParam, lParam );
eH955[fVd4 }
Sqf.#}u<= KN:dm!A 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:
:EwA$`/ %_MR.J+m2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
oRThJ B BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[7 `Dgnmq tgtoK|. 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:
FRt/{(jro ,?<h] !aQ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
m]d6@"Z. {
^Cn]+0G#C8 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ff1B)e {
HoE.//b //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
R9/xC7l@ SaveBmp();
j' KobyX< return FALSE;
hS{
*l9v7 }
eBTedSM?t …… //其它处理及默认处理
7(8 }
%C6zXiO" J+ZdZa}Ob $lAb6e$n 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。
Q(5:~**I xO<-<sRA 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。
0nz@O^*g( bC>>^?U1m 二、编程步骤
V1nZ M $ t# ,'M 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";
XjZao<?u BMWeD 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jnp6qpY{ %[\x%m) 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;
Z*(!`,.bB _K}_h\e. 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;
5m USh3 ^xw [d}0S 5、 添加代码,编译运行程序。
+.#S[G `J#xyDL6? 三、程序代码
l[ ": tG a]Da`$T ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
uM)9b*Vbo #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
K:
o|kd #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
1X"H6j[w #if _MSC_VER > 1000
ICCCCG*[ #pragma once
QGv:h[b_ #endif // _MSC_VER > 1000
~q?"w:@;x #ifndef __AFXWIN_H__
G'?f!fz; #error include 'stdafx.h' before including this file for PCH
7cmr
*y #endif
]7S7CVDk4 #include "resource.h" // main symbols
sJI- class CHookApp : public CWinApp
ym*#ZE`B! {
Y0X94k.u public:
W[X!P)=w] CHookApp();
5?{ >9j5 // Overrides
_l!U[{l*d // ClassWizard generated virtual function overrides
*o e0= //{{AFX_VIRTUAL(CHookApp)
w4fJ`, public:
&PBWJ?@O)r virtual BOOL InitInstance();
a.}:d30 virtual int ExitInstance();
wdcryejCkr //}}AFX_VIRTUAL
h/0-Mrk;e //{{AFX_MSG(CHookApp)
z@l!\m- // NOTE - the ClassWizard will add and remove member functions here.
qe6C|W~n // DO NOT EDIT what you see in these blocks of generated code !
OwiWnS< //}}AFX_MSG
gvc'
$9% DECLARE_MESSAGE_MAP()
v>y8s&/ };
@t;O"q'| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
?9zoQ[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
sx( l BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z^!A/a[[! BOOL InitHotkey();
j&[3Be'pQ BOOL UnInit();
J'&B:PZObB #endif
!/Bw,y ri< Avv //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=Mu'+,dT #include "stdafx.h"
~0[G/A$] #include "hook.h"
\/'#=q1 #include <windowsx.h>
X\p`pw$ #ifdef _DEBUG
3
!> L? #define new DEBUG_NEW
0(U3~k6 #undef THIS_FILE
V>>) 7E:Q static char THIS_FILE[] = __FILE__;
]IHD:!Z-= #endif
kJ#[UCqzM #define MAX_KEY 100
fJn3"D' #define CTRLBIT 0x04
7\0|`{|R@ #define ALTBIT 0x02
;!0.Kk
4 #define SHIFTBIT 0x01
g=oeS%>E #pragma data_seg("shareddata")
76IALJ00V HHOOK hHook =NULL;
q0b`HD UINT nHookCount =0;
!|Xl 8lV` static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
:L [YmZ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)kL`&+#> static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Bgk~R.l static int KeyCount =0;
9-a2L JI static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
im4e!gRE #pragma data_seg()
gB{]yA"(' HINSTANCE hins;
^Z-.[Y void VerifyWindow();
$ gr6 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
B'KXQa-$O //{{AFX_MSG_MAP(CHookApp)
9o_ g_q // NOTE - the ClassWizard will add and remove mapping macros here.
qrM{b= // DO NOT EDIT what you see in these blocks of generated code!
Ft"&NtXeZZ //}}AFX_MSG_MAP
MgH1d&R END_MESSAGE_MAP()
zqvRkMWc M vSYunI CHookApp::CHookApp()
@wEKCn|}o {
_
r^90 // TODO: add construction code here,
n&YW".iG // Place all significant initialization in InitInstance
0$f_or9T }
J/]o WC`u y?Hj%, CHookApp theApp;
j:v~MrQ7| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
BYr_Lz|T
{
'XP>} m BOOL bProcessed=FALSE;
"5o;z@(
if(HC_ACTION==nCode)
Pghva*& {
cYq']$] if((lParam&0xc0000000)==0xc0000000){// Key up
M\\e e3Ih switch(wParam)
"UhK]i*@l {
=qV4Sje|q case VK_MENU:
Wk\mgGn+ MaskBits&=~ALTBIT;
`Ct'/h{
break;
%?]{U($? case VK_CONTROL:
[Hv*\rb MaskBits&=~CTRLBIT;
[D<RV3x9 break;
'B:Z=0{>N case VK_SHIFT:
$,; ;u:- MaskBits&=~SHIFTBIT;
~{1/* &P break;
NK default: //judge the key and send message
Rm,[D)D^0N break;
koncWyW }
v2M"b?Q for(int index=0;index<MAX_KEY;index++){
u_}`y1Xu# if(hCallWnd[index]==NULL)
S.Wh4kMUe continue;
HQ|o%9~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1qm/{>a- {
l5ZADK4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
097Fvt=# bProcessed=TRUE;
"4Lg8qm }
JAGi""3HG }
1AV1d%F }
g{g`YvLu^ else if((lParam&0xc000ffff)==1){ //Key down
p|FlWR'mA switch(wParam)
A6?qIy {
T@K7DkP@ case VK_MENU:
g:3d<CS MaskBits|=ALTBIT;
>u9id>+ break;
$'A4RVVT case VK_CONTROL:
iX8h2l MaskBits|=CTRLBIT;
a'
IX yj break;
71k!k&Im case VK_SHIFT:
)CC?vV MaskBits|=SHIFTBIT;
b lRY7 break;
!p]T6_t]Q default: //judge the key and send message
%|: ;Ti break;
;=5@h!@R }
Qa,NGP. for(int index=0;index<MAX_KEY;index++)
Mv/IMO0rR
{
GN:Ru|n if(hCallWnd[index]==NULL)
s
jL*I continue;
763E 6,7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NqiB8hZ~ {
JwN}Jm SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
#d}0}7ue bProcessed=TRUE;
4o1Q7 }
:0
W6uFNOU }
>:w?qEaE }
jgk{'_ j if(!bProcessed){
`FZ(#GDF for(int index=0;index<MAX_KEY;index++){
K)<Wm,tON if(hCallWnd[index]==NULL)
b\SXZN)Be continue;
dIoF ~8V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
l?3vNa FeR SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/M0l
p }
3[MdUj1y[ }
:`:xP }
RpHpMtvNo/ return CallNextHookEx( hHook, nCode, wParam, lParam );
<MPeh&_3# }
f|-
m ^/y /HB+ami, BOOL InitHotkey()
(\Rwf}gyR {
R(M}0JRm if(hHook!=NULL){
IV)^;i nHookCount++;
pY^pTWs( return TRUE;
AC9{*K[ }
ggerh# else
7[ZkM+z! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Jn@Z8%B@Z if(hHook!=NULL)
.yZK.[x4 nHookCount++;
l\K% return (hHook!=NULL);
Cr'
!"F }
kR<xtHW BOOL UnInit()
+:Lk^Ny {
T$: >* if(nHookCount>1){
?cqicN.+6 nHookCount--;
gJ]Cq/gC return TRUE;
DBQOxryP>o }
5."5IjZu BOOL unhooked = UnhookWindowsHookEx(hHook);
{F;,7Kn+l if(unhooked==TRUE){
X}3P1.n: nHookCount=0;
]WTf< W< hHook=NULL;
]O6KKz }
x7vq?fP0n return unhooked;
XxmJP5 }
/yLzDCKn aXRv}WO$>k BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+n@f'a"> {
JzHqNUn*M BOOL bAdded=FALSE;
Z1VC5*K for(int index=0;index<MAX_KEY;index++){
Gh2#-~|cB if(hCallWnd[index]==0){
%GM>u2baw hCallWnd[index]=hWnd;
^$e0t;W= HotKey[index]=cKey;
/m97CC#+ HotKeyMask[index]=cMask;
`-~`<#E[ bAdded=TRUE;
x}v1X`6b KeyCount++;
&J\B\` break;
\eEds:Hg }
WLE%d]'%M }
5i^ `vmK return bAdded;
\M+MDT& }
gdOe)il\ pNP_f:A| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{d| |q<.- {
7raSf&{&6b BOOL bRemoved=FALSE;
LEWa6'0rq for(int index=0;index<MAX_KEY;index++){
r])Z9bbi if(hCallWnd[index]==hWnd){
nHrP>zN if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:_>\DJ'> hCallWnd[index]=NULL;
L_E^}^1! HotKey[index]=0;
xcHen/4X HotKeyMask[index]=0;
D0f*eSXE{ bRemoved=TRUE;
Y
[4vRzc KeyCount--;
4S'[\ZJO break;
E3y6c)< }
U?^OD }
-&@]M>r@ }
Tj Mb>w9 return bRemoved;
DG3[^B }
D`en%Lf!m +e U`H[iu void VerifyWindow()
?2/uSG| {
*nLIXnm for(int i=0;i<MAX_KEY;i++){
<} &7 a s if(hCallWnd
!=NULL){ y7>iz6N
if(!IsWindow(hCallWnd)){ 3Hs$]nQ_X
hCallWnd=NULL; kzMa+(fu
HotKey=0; YbzM6u2
HotKeyMask=0; R_7
6W&
KeyCount--; S)+CTVVE
} tL1P<1j_
} vuXS/ d
} HF]EU!OT
} p7s@%scp
tzPC/?
BOOL CHookApp::InitInstance() )Ea8{m!
{ Hc M~
AFX_MANAGE_STATE(AfxGetStaticModuleState()); J6DnPaw-G
hins=AfxGetInstanceHandle(); 9MT? .q
InitHotkey(); JfbKf~g
return CWinApp::InitInstance(); L1rwIOgq^
} &&&9
z*RSMfRW
int CHookApp::ExitInstance() >jv\Qh
{ $.wA?`1aSk
VerifyWindow(); o/WC@!wg K
UnInit(); !Ri
r&gF
return CWinApp::ExitInstance(); 8[oYZrg
} bQ<b[
3&$Nd
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file n3'dLJH|
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) lw s(/a*c
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {$0&R$v3
#if _MSC_VER > 1000 !Qcir&]C>
#pragma once ]Dh1~k.Kp
#endif // _MSC_VER > 1000 te)n{K",
8`*`nQhWa
class CCaptureDlg : public CDialog ALfiR(!
{ 3^XVQS***
// Construction t=Jm|wJnUA
public: 3|zgDA
BOOL bTray; ,7<DGI_y
BOOL bRegistered; 5Q|sta!
BOOL RegisterHotkey(); c8<xFvYG
UCHAR cKey; *!Y-!
UCHAR cMask; b_|u<
void DeleteIcon(); F;pQ \Y
void AddIcon(); zFywC-my@
UINT nCount; , |l@j%
void SaveBmp(); wYjQV?,
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~H u"yAR
// Dialog Data 0Qp[\ia
//{{AFX_DATA(CCaptureDlg) |0kXCq
enum { IDD = IDD_CAPTURE_DIALOG }; Y87XLvig}
CComboBox m_Key; +TF8WZZF.d
BOOL m_bControl; PS$k >_=t
BOOL m_bAlt; }a ^|L"
BOOL m_bShift; 9#Bx]wy
CString m_Path; ;gUXvx~~r
CString m_Number; x/xb1"
//}}AFX_DATA srK53vKMHW
// ClassWizard generated virtual function overrides ` 5#hjLe
//{{AFX_VIRTUAL(CCaptureDlg) ~p\n&{P0
public: rGQ5l1</
virtual BOOL PreTranslateMessage(MSG* pMsg); @; ;G88=
protected: )&,K94
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support doM?8C#`
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \Tyf *:_F>
//}}AFX_VIRTUAL 1Cv#nhmp
// Implementation 84^[/d;!
protected: E M Q4yK
HICON m_hIcon; dMV=jJ%Y
// Generated message map functions bK4&=#Zh
//{{AFX_MSG(CCaptureDlg) x,\!DLq:p
virtual BOOL OnInitDialog(); R*bmu
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B)6#Lp3
afx_msg void OnPaint(); t.)AggXj#
afx_msg HCURSOR OnQueryDragIcon(); 3fp> 4;ym'
virtual void OnCancel(); m2 O&2[g
afx_msg void OnAbout(); W$'0Dc
afx_msg void OnBrowse(); 8+>\3j
afx_msg void OnChange(); Bc<n2 C0
//}}AFX_MSG TF\sP8>V
DECLARE_MESSAGE_MAP() 4mJFvDZV`
}; 88 l,&2q
#endif CW-A e
_*E!gPO
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file
Jq)U</
#include "stdafx.h" /H)Br~ l
#include "Capture.h" {cR=N~_EO
#include "CaptureDlg.h" Rh<N);Sl7
#include <windowsx.h> +c) TDH
#pragma comment(lib,"hook.lib") #9:2s$O[x
#ifdef _DEBUG bi$VAYn.^
#define new DEBUG_NEW =|,A%ZGF$
#undef THIS_FILE H\#:,s {1
static char THIS_FILE[] = __FILE__; 0x ~`5h
#endif e:E# b~{
#define IDM_SHELL WM_USER+1 ah+j!e
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DP*@dFU"
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O%g\B8;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [zh"x#AyI
class CAboutDlg : public CDialog
%w5[*V
{ J +q|$K6
public: YeyGN
CAboutDlg(); bX2"89{
// Dialog Data 74f9|~%
//{{AFX_DATA(CAboutDlg) LT_iS^&1
enum { IDD = IDD_ABOUTBOX }; *_"u)<J
//}}AFX_DATA J(s;$PG
// ClassWizard generated virtual function overrides 6I>^Pf'ND
//{{AFX_VIRTUAL(CAboutDlg) /g76Hw>H
protected: !` 26\@1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y@;%Uv&
//}}AFX_VIRTUAL O('Nn]wo~9
// Implementation
10O$'`
protected: p3yU:q#A
//{{AFX_MSG(CAboutDlg) URw5U1
//}}AFX_MSG K9|7dvzC:
DECLARE_MESSAGE_MAP() af'@h:
}; *aRX \TnN
<
kP+eD
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d#>y }H9
{ &z@~B&O
//{{AFX_DATA_INIT(CAboutDlg) nIBFk?)6
//}}AFX_DATA_INIT >qh?L#Fk
} F8=nhn
c!wtf,F
void CAboutDlg::DoDataExchange(CDataExchange* pDX) FjFwvO_.
{ Fo}7hab
CDialog::DoDataExchange(pDX); _Y!sVJ){,c
//{{AFX_DATA_MAP(CAboutDlg) KDTDJ8
//}}AFX_DATA_MAP
q3S+Y9L
} ST;t,
D:
&&7r+.Y
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Oy_c
//{{AFX_MSG_MAP(CAboutDlg) > 0.W`j(s
// No message handlers dR+1aY;
//}}AFX_MSG_MAP 4!%F\c46
END_MESSAGE_MAP() B42sb_
zwr\:Hu4
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "b,%8
: CDialog(CCaptureDlg::IDD, pParent) +iA=y=;blH
{ NXU`wnVJ
//{{AFX_DATA_INIT(CCaptureDlg) aE/D*.0NI
m_bControl = FALSE; lddp^ #f
m_bAlt = FALSE; XvKFPr0~
m_bShift = FALSE; GwLFL.Ke
m_Path = _T("c:\\"); o#D.9K(
m_Number = _T("0 picture captured."); GoE
'L
nCount=0; ^Z}Ob= .G
bRegistered=FALSE; fn}UBzED\
bTray=FALSE; DtF}QvA
//}}AFX_DATA_INIT LFu%v7L`
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `i fiL
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ao$.6X8fQ
} L
CSeOR
YnTB&GPxl
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /:[2'_Xl
{ {{!Y]\2S
CDialog::DoDataExchange(pDX); rU2iy"L
//{{AFX_DATA_MAP(CCaptureDlg) kWW w<cA
DDX_Control(pDX, IDC_KEY, m_Key); Vrp[r *V@E
DDX_Check(pDX, IDC_CONTROL, m_bControl); 'C>U=cE7
DDX_Check(pDX, IDC_ALT, m_bAlt); ^p=L\SJ
DDX_Check(pDX, IDC_SHIFT, m_bShift); KQ`=t
DDX_Text(pDX, IDC_PATH, m_Path); ||eAE)
DDX_Text(pDX, IDC_NUMBER, m_Number); M+xdHBg
//}}AFX_DATA_MAP R_kQPP
} Q@QFV~
s;1h-Oq(
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :&w{\-0{
//{{AFX_MSG_MAP(CCaptureDlg) jbte
*Ae
ON_WM_SYSCOMMAND() kQv*eZ~
ON_WM_PAINT() \%A%s*1
ON_WM_QUERYDRAGICON() olYsT**'
ON_BN_CLICKED(ID_ABOUT, OnAbout) @aG&n(.!u*
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -yx/7B5@
ON_BN_CLICKED(ID_CHANGE, OnChange) nU
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//}}AFX_MSG_MAP NgZUnh3{
END_MESSAGE_MAP() z1V#'$_5-
6Y384
BOOL CCaptureDlg::OnInitDialog() 6oL1_)
{ Mi7y&~,
CDialog::OnInitDialog(); (ywo
a
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); #-#NqX:
ASSERT(IDM_ABOUTBOX < 0xF000); Qx`~g,wk8
CMenu* pSysMenu = GetSystemMenu(FALSE); !|G(Yg7C
if (pSysMenu != NULL) (lH,JX`$a
{ USPTpjt8R
CString strAboutMenu; B]iP't\~
strAboutMenu.LoadString(IDS_ABOUTBOX); 0E/:|k
if (!strAboutMenu.IsEmpty()) _|{aC1Y!V
{ !?FK We
pSysMenu->AppendMenu(MF_SEPARATOR); 2#5,MP~r
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); nCxAQ|P?
} "$^0%-
} }
:?.>#
SetIcon(m_hIcon, TRUE); // Set big icon " Ar*QJ0]
SetIcon(m_hIcon, FALSE); // Set small icon !K0JV|-?t
m_Key.SetCurSel(0); <vc`^Q&4B
RegisterHotkey(); 3I=kr
CMenu* pMenu=GetSystemMenu(FALSE); XhW %,/<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); HAB#pd9
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $#NQ<3
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); F}
DUEDND*
return TRUE; // return TRUE unless you set the focus to a control eiMH['X5
} 6[dur'x
,^s
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )R)a@op
{ 40P) 4w
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4FMF|U
{ 6`H.%zM
CAboutDlg dlgAbout; xi'>m IT
dlgAbout.DoModal(); ^4$'KIq
} cPF<D$B
else ;[0&G6g
{ C2F0tr|
CDialog::OnSysCommand(nID, lParam); ~oD8Rnf
} SW?p?<
} `$RA< 3
rAqxTdF
void CCaptureDlg::OnPaint() {I1~-8
{ ]]iPEm"@
if (IsIconic()) WQePSU
{ mxG ]kqi
CPaintDC dc(this); // device context for painting /!xF?OmVd
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6vy7l(%
// Center icon in client rectangle z01>'
int cxIcon = GetSystemMetrics(SM_CXICON); (!K_Fy@
int cyIcon = GetSystemMetrics(SM_CYICON); Oe]&(
CRect rect; I4_d[O9
GetClientRect(&rect); lX!`zy{3k
int x = (rect.Width() - cxIcon + 1) / 2; 6j9)/ HP
int y = (rect.Height() - cyIcon + 1) / 2; vA% ^`5
// Draw the icon \F6LZZ2Lv
dc.DrawIcon(x, y, m_hIcon); j|_E$L A\
} l}g;'9ZB
else OEgI_=B
{ v> z@
CDialog::OnPaint(); P&A|PY,P
} pxINw>\Qv
} 2 YxT MT
JiS5um=(.
HCURSOR CCaptureDlg::OnQueryDragIcon() 5F $V`kYT
{ =P77"Dd
return (HCURSOR) m_hIcon; TYgQJW?
} |$lwkC)O
\+PIe7f_
void CCaptureDlg::OnCancel() 90N`CXas
{ @1RP/y%
if(bTray) j
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DeleteIcon(); KpiF0K
CDialog::OnCancel(); 9h,u6e
} IO$z%r7
b`mj_b
void CCaptureDlg::OnAbout() *JCQu0
{ *wbZ;rfF
CAboutDlg dlg; 8cg`7(a
dlg.DoModal(); b3qc_
} X=X\F@V:u
$ItF])Bj5N
void CCaptureDlg::OnBrowse() HL{$ ^l#v
{ r4 dOK] 0
CString str; I*[tMzE
BROWSEINFO bi; V9 }t0$LN
char name[MAX_PATH]; |1=
!;.#
ZeroMemory(&bi,sizeof(BROWSEINFO)); rp34?/Nz
bi.hwndOwner=GetSafeHwnd(); &lc8G
bi.pszDisplayName=name; L):qu
bi.lpszTitle="Select folder"; LxN*)[ Wb
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4/>Our 5
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2s ,8R
if(idl==NULL) P* #8ZMA<
return; J]/}ojW3
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <&!]K?Q9i
str.ReleaseBuffer(); lT8\}hNI+
m_Path=str; 4N?v
if(str.GetAt(str.GetLength()-1)!='\\') I?!rOU=0
m_Path+="\\"; - 0HkT Y
UpdateData(FALSE); uV6g[J
} yl]FP@N(
2YwVU.*>
void CCaptureDlg::SaveBmp() y>VcgLIB
{ F_;tT%ywfx
CDC dc; :K.4 n
dc.CreateDC("DISPLAY",NULL,NULL,NULL); P1zK2sL_
CBitmap bm; !E\[SjY@J
int Width=GetSystemMetrics(SM_CXSCREEN); "kW!{n
int Height=GetSystemMetrics(SM_CYSCREEN); wzcai
0y*
bm.CreateCompatibleBitmap(&dc,Width,Height); WT3gNNx|
CDC tdc; ),^eA
tdc.CreateCompatibleDC(&dc); 6iezLG5
CBitmap*pOld=tdc.SelectObject(&bm); PFSLyV*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W=}Okq)x9I
tdc.SelectObject(pOld); /!FWuRe^
BITMAP btm; *=F(KZ
bm.GetBitmap(&btm); .5HQ
DWORD size=btm.bmWidthBytes*btm.bmHeight; <!^
[~`
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cSP*f0n,eo
BITMAPINFOHEADER bih; y7u^zH6wj
bih.biBitCount=btm.bmBitsPixel; >R^@Ww;|q
bih.biClrImportant=0; MLVB^<qkeH
bih.biClrUsed=0; j#A%q"]8
bih.biCompression=0; US&B!Q:v
bih.biHeight=btm.bmHeight; 5CYo7mJ6+
bih.biPlanes=1; 43:t
\
bih.biSize=sizeof(BITMAPINFOHEADER); V-O(U*]
bih.biSizeImage=size; CX/(o]
bih.biWidth=btm.bmWidth; D}mL7d1
bih.biXPelsPerMeter=0; 0`#(Toe{B
bih.biYPelsPerMeter=0; =odkz}bU
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KlxN~/gyik
static int filecount=0; "`tXA
CString name; eBW=^B"y+
name.Format("pict%04d.bmp",filecount++); Jcf"#u-Q/
name=m_Path+name; P8yIegPY
BITMAPFILEHEADER bfh; 8}p8r|d!ls
bfh.bfReserved1=bfh.bfReserved2=0; <EX7WA
bfh.bfType=((WORD)('M'<< 8)|'B'); czWw~'."
bfh.bfSize=54+size; &vUq}r%P
bfh.bfOffBits=54; 'JmBh@A
CFile bf; qojXrSb"y
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w; TkkDH
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NC23Z0y
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '%iPVHK7
bf.WriteHuge(lpData,size); )6oGF>o>
bf.Close(); 5a`%)K
nCount++; |WQ9a' '
} O_,O,1
GlobalFreePtr(lpData); U..<iNQE5
if(nCount==1) [IX+M#mf
m_Number.Format("%d picture captured.",nCount); `H%G3M0a
else EYzg%\HH
m_Number.Format("%d pictures captured.",nCount); t=wXTK5"
UpdateData(FALSE); @uleyB
} Rs;15@t@
8QgA@y"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I+?hG6NM
{ fjz) Gp
if(pMsg -> message == WM_KEYDOWN) 5>0.NiXGf'
{ Un=a
fX?j
if(pMsg -> wParam == VK_ESCAPE) a' FN 3
return TRUE; Zc5
:]]
if(pMsg -> wParam == VK_RETURN)
!rL<5L
return TRUE; 1i|.h
} '&yg{n
return CDialog::PreTranslateMessage(pMsg); lJ
} |Ur"za;%@
85Y|CN] vQ
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) **;p(CI
{ M?&zY
"c
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HMQI&Lh=U
SaveBmp(); _9If/RD
return FALSE; +++pI.>(*Q
} 0{rx.C7|
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d"<F!?8
CMenu pop; p]|LV)R n
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7XAvd-
CMenu*pMenu=pop.GetSubMenu(0); !p.^ITM3S
pMenu->SetDefaultItem(ID_EXITICON); M@7Xp)S"
CPoint pt; GrI&?=S^
GetCursorPos(&pt); [/9(NUf
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6SEltm(
if(id==ID_EXITICON) H#(<-)j0_
DeleteIcon(); ;Rnhe_A.
else if(id==ID_EXIT) BSUPS+@+
OnCancel(); 'p}`i/
return FALSE; {w5Z7s0
} KFhG (
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `lCuU~~ag
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) knHv?#
AddIcon(); lgD]{\O$ip
return res; 8I#D`yVKc
} +<(a}6dt
&^QPkX@p
void CCaptureDlg::AddIcon() AlX3Wv}
{ :=!Mh}i
NOTIFYICONDATA data; A" !n1P
data.cbSize=sizeof(NOTIFYICONDATA); W
kkxU.xXE
CString tip; 78Y@OL_$
tip.LoadString(IDS_ICONTIP); h8v>zNf'
data.hIcon=GetIcon(0); rG6\ynBX%
data.hWnd=GetSafeHwnd(); Jq1 n0O
strcpy(data.szTip,tip); VWa|Y@Dc]
data.uCallbackMessage=IDM_SHELL; \ lr/;-zP
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; __\P`S_
data.uID=98; h7W}OF_=y
Shell_NotifyIcon(NIM_ADD,&data); 3E|;r
_;
8
ShowWindow(SW_HIDE); Wc4vCVw
bTray=TRUE; 3N%{B
}
tbG8MXX
sBjXE>_#)
void CCaptureDlg::DeleteIcon() 0X"\ a'M_
{ uw_?O[ZA[
NOTIFYICONDATA data; %KV2<t?
data.cbSize=sizeof(NOTIFYICONDATA); L#j/0IHD
data.hWnd=GetSafeHwnd(); iJnh$jo
data.uID=98; h|W%4|]R)
Shell_NotifyIcon(NIM_DELETE,&data); TVkcDS
ShowWindow(SW_SHOW); zO.6WJ
SetForegroundWindow(); Rc9<^g`
ShowWindow(SW_SHOWNORMAL); mK\aI
bTray=FALSE; ;'1Apy
} ,U=E[X=H
*x,HnHT
void CCaptureDlg::OnChange() >>V&yJ_
{ > V%Q O>C
RegisterHotkey(); h6QWH
} &oN/_7y
'lQYJ0
BOOL CCaptureDlg::RegisterHotkey() L8P36]>
{ l9Pu&M?5
UpdateData(); ,}7_[b)&V
UCHAR mask=0; .TN2s\:]jw
UCHAR key=0; l2/@<0P
if(m_bControl) jgRCs.6
mask|=4; o;;,iHu*
if(m_bAlt) (,tHL
mask|=2; chLeq
if(m_bShift) yQ-hnlzn~
mask|=1; Wo3'd|Y~i
key=Key_Table[m_Key.GetCurSel()]; n~%}Z[5D
if(bRegistered){ <%?uYCD
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Bbs 0v6&,
bRegistered=FALSE; [4gjC
} z93nYY$`Y
cMask=mask; ;&mxqY8`'
cKey=key; 6ZgNHARS
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p#<nK+6.8
return bRegistered; Q\WXi
} ZKQo#!}
yBe(^ n
四、小结 ZR
mPP
?!m ma\W
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。