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;W-#gnY
&fWC-| 一、实现方法
5p}j{f _>;MQ)Km~ 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:
1 hFh F^ |ka/5o #pragma data_seg("shareddata")
1W\wIj. HHOOK hHook =NULL; //钩子句柄
^VG].6 UINT nHookCount =0; //挂接的程序数目
1P1h);*Z static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
EmrkaV-?k static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
LL
(TD& static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
.zt&HI.F static int KeyCount =0;
vk
X+{n static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0L8fpGJ #pragma data_seg()
k+?gWZ\ GiM-8y~ 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。
PX/{!_mM Z'2AsT 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:
$57Q
g1v -ZSN0Xk BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
N6u>V~i cKey,UCHAR cMask)
lN:;~;z_ {
3Og}_ BOOL bAdded=FALSE;
;n*|AL7( for(int index=0;index<MAX_KEY;index++){
sF[gjeIb if(hCallWnd[index]==0){
X])iQyN hCallWnd[index]=hWnd;
Pp8G2|bz HotKey[index]=cKey;
I;E?;i HotKeyMask[index]=cMask;
YG8C<g6E7 bAdded=TRUE;
KN657 |f KeyCount++;
{5X,xdzR break;
[?9 `x-Q }
%bF157X5An }
uF}dEDB|; return bAdded;
f
-F}~S }
uo2k //删除热键
/t7f5mA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.AO-S)wHR {
b=2:\F BOOL bRemoved=FALSE;
n~\; +U for(int index=0;index<MAX_KEY;index++){
V,Nu!$)J if(hCallWnd[index]==hWnd){
wL,
-" if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#>)z}a] hCallWnd[index]=NULL;
^W:a7cMw HotKey[index]=0;
: Bo HotKeyMask[index]=0;
xxl|j$m bRemoved=TRUE;
e/:? 9 KeyCount--;
L8h!%56s break;
)~R[aXkvY }
Cx/J_Ro# }
FI?J8a }
c;X,-Q9 return bRemoved;
(2>q }
<
B]qqqP &QfEDDJ ,'`yh|}G\ DLL中的钩子函数如下:
&uO-h 612,J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
F$
G)vskd {
'5$@I{z BOOL bProcessed=FALSE;
k]r4b`x` if(HC_ACTION==nCode)
.0xk}, {
cf,6";8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
l P=I0A- switch(wParam)
e<1Ewml(] {
?G',Qtz<K case VK_MENU:
tl!dRV92 MaskBits&=~ALTBIT;
P%l?C?L break;
PcT] case VK_CONTROL:
`f&::>5tD MaskBits&=~CTRLBIT;
a*X{hU9P break;
g3[-[G^5 case VK_SHIFT:
([rn.b] MaskBits&=~SHIFTBIT;
VPT?z break;
wS9V@ default: //judge the key and send message
rYdNn0mhk break;
"xTVu57Z[ }
TS+jDs for(int index=0;index<MAX_KEY;index++){
yBs-bp"- if(hCallWnd[index]==NULL)
WLj]EsA. continue;
[@VzpVhXz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G[ #R 1' {
@Z'i7Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d@{12hq bProcessed=TRUE;
^1Fzs(#. }
W&9qgbO] }
8[X"XThj }
9%NsW3| else if((lParam&0xc000ffff)==1){ //有键按下
yeta)@nH switch(wParam)
2%R.~9HtA {
+<p&Va# case VK_MENU:
6AY(/N8V MaskBits|=ALTBIT;
L7(FDv,? break;
e/+.^ '{ case VK_CONTROL:
GU/P%c/V MaskBits|=CTRLBIT;
q\i&ERr break;
1I69O6" case VK_SHIFT:
nF]R" MaskBits|=SHIFTBIT;
VvP: }yJ break;
A. tGr(r default: //judge the key and send message
}ixCbuD break;
U&R)a|
7R }
Pm2LB<qS for(int index=0;index<MAX_KEY;index++){
l\AdL$$Mb if(hCallWnd[index]==NULL)
r`Fs"n#^-4 continue;
z;9D[ME#1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3zKeN:w {
wt9f2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
C|Gk} bProcessed=TRUE;
VV$#<D<) }
j?o6>j }
&W<9#RPK' }
"DvZCf[} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
K7JZUS`C! for(int index=0;index<MAX_KEY;index++){
iVeH\a if(hCallWnd[index]==NULL)
%2I>-0]B continue;
af@a / if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
%Ul,9qG+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
JK!`uG+v //lParam的意义可看MSDN中WM_KEYDOWN部分
J?Y,3cc. }
fP4P'eI }
9fbbJ"I+ }
P(@Q[XQ2 return CallNextHookEx( hHook, nCode, wParam, lParam );
N&
F.hi$_ }
\ Qx%76 1@'I eywg 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:
{#?|&n< +(:Qf+: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(:E@kpK BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[75?cQD Yh!k uS#< 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:
dB#c$1 pO)EYla9 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
i; ]0>g4 {
cjGN=|`u if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
*u|1Z%XO {
5
Slz^@n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
x5\D u63 SaveBmp();
@.k^ 8hc return FALSE;
M'R
] '' }
~QUNR?h …… //其它处理及默认处理
l{^s4 }
L{IMZ+IB2| 6l4= ^b5+A6? 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。
Io
IhQ <uFj5. 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%}<z*~NE@ v8C( $<3% 二、编程步骤
/=za
m3kd K0v S 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
YhRy
C*b 7;TMxO=bra 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,37<FXX, ;q%z\gA 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
YSPUQ uUq= L 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
l-c:'n {)b 5、 添加代码,编译运行程序。
#d[Nm+~ko & uwOyb 三、程序代码
t~ I;IB St!0MdCH ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
K@[Hej6d #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#M!{D #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<{ v
%2 #if _MSC_VER > 1000
A+H8\ew2, #pragma once
7p!f+\kM #endif // _MSC_VER > 1000
C`qV+pV #ifndef __AFXWIN_H__
JURu>-i #error include 'stdafx.h' before including this file for PCH
r~QE}00@^ #endif
HWFTI /] #include "resource.h" // main symbols
*(vh | class CHookApp : public CWinApp
'/loJz 1 {
862rol public:
]i,o+xBKH CHookApp();
K9 }Brhe // Overrides
vAop#V // ClassWizard generated virtual function overrides
AH'3
5Kf) //{{AFX_VIRTUAL(CHookApp)
0x*|X@6\ public:
o>+ mw| { virtual BOOL InitInstance();
FY)]yz virtual int ExitInstance();
3]}RjOTU //}}AFX_VIRTUAL
M?('VOy) //{{AFX_MSG(CHookApp)
*a8 <cf // NOTE - the ClassWizard will add and remove member functions here.
4DL2
A;T // DO NOT EDIT what you see in these blocks of generated code !
/|&4&$ //}}AFX_MSG
>tMI%r DECLARE_MESSAGE_MAP()
4|Y1W}!0/ };
1Lje.%(E. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
dS Tyx#o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
|${ImP BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
jd5kkX8= BOOL InitHotkey();
sieC7raO BOOL UnInit();
E&t8nlTx #endif
:,$"Gk E^{!B]/oP //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*+6iXMwe #include "stdafx.h"
Zi\ex\ )5 #include "hook.h"
>y#qn9rV1 #include <windowsx.h>
pih 0ME}z #ifdef _DEBUG
r.Z g<T #define new DEBUG_NEW
:?ZrD,D #undef THIS_FILE
I!kR:Z static char THIS_FILE[] = __FILE__;
RZnmia #endif
Jwj=a1I 53 #define MAX_KEY 100
3gJZlH5IR #define CTRLBIT 0x04
bV'r9&[_6 #define ALTBIT 0x02
!RwhVaSh #define SHIFTBIT 0x01
y.8nzlkE{ #pragma data_seg("shareddata")
y#`;[! HHOOK hHook =NULL;
WH7UJCQ UINT nHookCount =0;
{LA?v& b' static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
q&6|uV])H static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
R@ Gll60 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
H!"TS-s` static int KeyCount =0;
qZV|}M>P) static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
g;[t1~oF #pragma data_seg()
ofz?L#:2 HINSTANCE hins;
'+iLW~ void VerifyWindow();
(IjM BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
km^ZF<. @ //{{AFX_MSG_MAP(CHookApp)
SS_6VE*sI // NOTE - the ClassWizard will add and remove mapping macros here.
@6R6.i5d // DO NOT EDIT what you see in these blocks of generated code!
p9\*n5{ //}}AFX_MSG_MAP
IW@phKz END_MESSAGE_MAP()
{w"Cr0F, }$uwAevP{y CHookApp::CHookApp()
`0_
Y| 4KB {
G[_Z|Xi1 // TODO: add construction code here,
OfA+|xT& // Place all significant initialization in InitInstance
VhMVoW }
#
&5. ~d\V> CHookApp theApp;
1BEc" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
C+`V?rp=s {
Ets6tM` BOOL bProcessed=FALSE;
't*]6^ if(HC_ACTION==nCode)
?-9uf\2_ {
ku}`PS0UGd if((lParam&0xc0000000)==0xc0000000){// Key up
o>yXEg switch(wParam)
MwQt/Qv= {
fiU#\%uJg case VK_MENU:
*D[yA MaskBits&=~ALTBIT;
%`lJA W[ break;
b"trg {e case VK_CONTROL:
&{qKoI] MaskBits&=~CTRLBIT;
>RJ&b break;
1#+|RL4o case VK_SHIFT:
f4d-eXGwx` MaskBits&=~SHIFTBIT;
eMV8`&c' break;
"j8=%J{ default: //judge the key and send message
l1L8a I,8 break;
`e3$jy@ }
JwWxM3(%t for(int index=0;index<MAX_KEY;index++){
T9kc(i' if(hCallWnd[index]==NULL)
SH8zkAA7u} continue;
B#5[PX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FK-q-PKO#. {
$XkO\6kh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gyh8 bProcessed=TRUE;
V=1zk-XC }
|:2B )X }
E&@#*~ }
<_=O0 t|6 else if((lParam&0xc000ffff)==1){ //Key down
c1y+kvv switch(wParam)
x7i<dg& {
WMWMb3 case VK_MENU:
QSM3qke MaskBits|=ALTBIT;
R(P(G;#j break;
0sme0"Sl case VK_CONTROL:
#QSSpsF@ MaskBits|=CTRLBIT;
yn<J>e break;
j]R[;8g case VK_SHIFT:
TVSCjI MaskBits|=SHIFTBIT;
Ux= B*m1@{ break;
0mmHN`< default: //judge the key and send message
gnxD'1_ break;
r[GH#vF;7 }
:kwDa
a for(int index=0;index<MAX_KEY;index++)
.J+F
HG' {
kFyp;=d:K if(hCallWnd[index]==NULL)
Lg#(?tMp,' continue;
{7%HK2=' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\\Q){\S {
3=Rk(%:; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5e7\tBab bProcessed=TRUE;
=43NSY }
L8NZU*" }
FDGG$z?>m }
n^5Q
f\ o if(!bProcessed){
-F3~X R for(int index=0;index<MAX_KEY;index++){
5gC>j( if(hCallWnd[index]==NULL)
5e0d;Rd
continue;
),j6tq[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Q0x?OL] A SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
dIhfp7| }
xpwy%uo }
E m +&I }
Rxlv: return CallNextHookEx( hHook, nCode, wParam, lParam );
V U5</si+ }
zx.SRs$ "sY}@Q7 BOOL InitHotkey()
y>gw@+ {
r{SDJa if(hHook!=NULL){
87!m l nHookCount++;
l7 @cov return TRUE;
8]1,E E< }
IJDbm}:/e else
+KNd%AJ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
EdSUBoWF} if(hHook!=NULL)
zM<L_l& nHookCount++;
+qT+iHa|n return (hHook!=NULL);
8$ #z> }
m!P<#
|V BOOL UnInit()
@'?gan#( {
a69e^;,>q if(nHookCount>1){
$MfRw nHookCount--;
?<8c return TRUE;
\ n^[!e"` }
pFwJ: BOOL unhooked = UnhookWindowsHookEx(hHook);
0]=Bqyg if(unhooked==TRUE){
g)|vS>^~ nHookCount=0;
k"/Rjd(; hHook=NULL;
"*W# z }
[fo#){3K return unhooked;
A^LS^!Jz }
5IFzbL#q#f ib!TXWq BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:$PrlE {
(pd~ 2!;C BOOL bAdded=FALSE;
&%qDi_UD for(int index=0;index<MAX_KEY;index++){
Tm7LaM if(hCallWnd[index]==0){
+*Uv+oC| hCallWnd[index]=hWnd;
KU+\fwYpnk HotKey[index]=cKey;
9$C?)XKXB HotKeyMask[index]=cMask;
~%f$}{ bAdded=TRUE;
k#8`996P KeyCount++;
bw7g L\* break;
Fr;
's(^ }
ZW0\_1 }
V7p
hD3Y return bAdded;
IXR'JZ?fH }
'RzO`-dr u=vBjaN2_w BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|3Oyg ?2 {
t imY0fx# BOOL bRemoved=FALSE;
yx:+Xy*N for(int index=0;index<MAX_KEY;index++){
Y5;afU=' if(hCallWnd[index]==hWnd){
}&2,!;"">3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
v9S=$Aj hCallWnd[index]=NULL;
#Er"i HotKey[index]=0;
(uhE'IQ{( HotKeyMask[index]=0;
X7`-dSVE bRemoved=TRUE;
niW"o-} KeyCount--;
;$gV$KB:xA break;
|_-w{2K }
Ht\2 IP }
"Jg.)1Jw }
H270)Cwn+ return bRemoved;
n~}[/ly }
k)X\z@I' $N;J) void VerifyWindow()
d%epM5 {
cs9h\]ZA for(int i=0;i<MAX_KEY;i++){
#d/T7c# if(hCallWnd
!=NULL){ ~UNha/nt
if(!IsWindow(hCallWnd)){ l(}L-:@A
hCallWnd=NULL; 8"-=+w.CZ
HotKey=0; HIvSpO
HotKeyMask=0; 'gg<)Bd
KeyCount--; g`fMHU7
} i^ |G
} 3/yt
} g0}jE%)
} {x_cgsn
',t*:GBZCf
BOOL CHookApp::InitInstance() ZZTf/s*
{ ]FIIs58IM
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~K<h~TNP
hins=AfxGetInstanceHandle(); -zqpjxU:
InitHotkey(); \0_jmX]p
return CWinApp::InitInstance(); ;Oqf{em];
} ']+!i a
J[hmY= ,
int CHookApp::ExitInstance() 'g'RXC}D>
{ .s!0S-RkC
VerifyWindow(); '-[hy>t
UnInit(); Z~8%bfpe
return CWinApp::ExitInstance(); m6$&yKQ-=h
} DLqH*U
Vwh;QJxb
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file bR~(Ry`
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G e]NA]<
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g}gGm[1SUo
#if _MSC_VER > 1000 r=vY-p
#pragma once 5$HG#2"Kb#
#endif // _MSC_VER > 1000 R9#ar{
~_N,zw{x
class CCaptureDlg : public CDialog z>,M@@
{
^RT_Lky
// Construction Y&U-d{"
public: Haekr*1%
BOOL bTray; 2rf8)8':
BOOL bRegistered; n8_X<jIp3
BOOL RegisterHotkey(); =N{?ll6x7g
UCHAR cKey; :l!sKT?:d!
UCHAR cMask; /#(IV_Eol
void DeleteIcon(); k}&wy
void AddIcon(); Ka-o$o[^u`
UINT nCount; JehanF[
void SaveBmp(); F~
\ONO5
CCaptureDlg(CWnd* pParent = NULL); // standard constructor hif;atO
// Dialog Data YlGUd~$`"+
//{{AFX_DATA(CCaptureDlg) yUpN`;
enum { IDD = IDD_CAPTURE_DIALOG }; YI"!&a'yj
CComboBox m_Key; X';qcn_^
BOOL m_bControl; V6HZvuXV!
BOOL m_bAlt; ,Ww}xmq1H
BOOL m_bShift; "5
~{
CString m_Path; sCzpNJ"8
CString m_Number; Zy;jp*Q
//}}AFX_DATA F+Qnf'at1
// ClassWizard generated virtual function overrides e7{6<[k3+$
//{{AFX_VIRTUAL(CCaptureDlg) 3C%|src
public: b|DU
virtual BOOL PreTranslateMessage(MSG* pMsg); Sk!' 2y*@&
protected: T&>65`L
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r"h09suZBW
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Z$KyK.FUU
//}}AFX_VIRTUAL ]GY8f3~|{
// Implementation @-\=`#C**
protected: xZ;eV76
HICON m_hIcon; <Z 3C&BM
// Generated message map functions ~K3Lbd|
r
//{{AFX_MSG(CCaptureDlg) /}>8|#U3y
virtual BOOL OnInitDialog(); ^\Q,ACkZb
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2)|=+DN;
afx_msg void OnPaint(); GQY"
+xa8]
afx_msg HCURSOR OnQueryDragIcon(); jLI1Ed
virtual void OnCancel(); fx(8 o+
afx_msg void OnAbout(); #<9'{i3
afx_msg void OnBrowse(); % R25, V
afx_msg void OnChange(); $p0D9mF
//}}AFX_MSG r/a@ x9
DECLARE_MESSAGE_MAP() gL&w:_
}; Tc||96%2^
#endif vnQFq
f~a
7E;y
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e.DN,rhqI
#include "stdafx.h" #I0FWZ>W
#include "Capture.h" 3?"gfw W
#include "CaptureDlg.h" iBbaHU*V
#include <windowsx.h> :'C?uk ?
#pragma comment(lib,"hook.lib") -p)`o b-
#ifdef _DEBUG bF_0',W
#define new DEBUG_NEW ]J!#"m-]
#undef THIS_FILE 2ns,q0I
A
static char THIS_FILE[] = __FILE__; ?;`GCE
#endif ?zutU w/m
#define IDM_SHELL WM_USER+1 *v K~t|z
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a B MV6'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S$fS|N3]%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?#: ']q
class CAboutDlg : public CDialog *f;$5B#^
{ dO1m
public: PDA9.b<q0
CAboutDlg(); UsU
Ri
// Dialog Data 9(S=0<
//{{AFX_DATA(CAboutDlg) ';Nc;9
enum { IDD = IDD_ABOUTBOX }; H@wjZ;R
//}}AFX_DATA yy8BkG(
// ClassWizard generated virtual function overrides K\xM%O?
//{{AFX_VIRTUAL(CAboutDlg) y|MhV/P04
protected: 4To$!=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e\[q3J
//}}AFX_VIRTUAL "'Fvt-<^S7
// Implementation Wc+(xk
protected: :KX*j$5U
//{{AFX_MSG(CAboutDlg) &(,&mE
//}}AFX_MSG lg$aRqI29
DECLARE_MESSAGE_MAP() `V V>AA5
}; iz/CC V L
|&MoQxw@
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) TK'
5NM+4
{ `^8mGR>OpI
//{{AFX_DATA_INIT(CAboutDlg) a1I-d=]
//}}AFX_DATA_INIT ~Uv#)
} y4p"LD5%^
44P [P{y
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PP'5ANK
{ ,=Wj*S)~
CDialog::DoDataExchange(pDX); H'YK j'
//{{AFX_DATA_MAP(CAboutDlg) dZ(Z]`L,B
//}}AFX_DATA_MAP )hO%W|
} k}<H
{{P 3Z[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]6`K
//{{AFX_MSG_MAP(CAboutDlg) JC~sz^>p\
// No message handlers !]uB4
//}}AFX_MSG_MAP CStNCBZ|\
END_MESSAGE_MAP() CckfoJ 9
Sft
vN-
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |-\anby<
: CDialog(CCaptureDlg::IDD, pParent) 2RNee@!JJP
{ p2b~k[
//{{AFX_DATA_INIT(CCaptureDlg) <#M1I!R
m_bControl = FALSE; Y&=DjKoVh
m_bAlt = FALSE; ['\R4H!x
m_bShift = FALSE; 6q>iPK Jt
m_Path = _T("c:\\"); K*Ba;"Ugeg
m_Number = _T("0 picture captured."); !*&5O~dfN
nCount=0; {4vWSb
bRegistered=FALSE; |#cqxr "
bTray=FALSE; GOA
dhh-
//}}AFX_DATA_INIT {N{eOa<HA
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (oy@j{G)c6
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ojBdUG\
} _$IWr)8f
zB+e;x f |
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) C,>n
{ h+H+>,N8`
CDialog::DoDataExchange(pDX); 6%6dzZ
//{{AFX_DATA_MAP(CCaptureDlg) X!z-J>
DDX_Control(pDX, IDC_KEY, m_Key); ~1*37 w~
DDX_Check(pDX, IDC_CONTROL, m_bControl); 3)=ix. wW
DDX_Check(pDX, IDC_ALT, m_bAlt); RF2I_4
DDX_Check(pDX, IDC_SHIFT, m_bShift); m2(}$z3e
DDX_Text(pDX, IDC_PATH, m_Path); Ucy=I$"
DDX_Text(pDX, IDC_NUMBER, m_Number); Q
Rr9|p{
//}}AFX_DATA_MAP -b?M5P*:
} ]-#/wC[$l=
_,K[kVn
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ofoh4BL'1@
//{{AFX_MSG_MAP(CCaptureDlg) R>:D&$[RD
ON_WM_SYSCOMMAND() r 56~s5A
ON_WM_PAINT() kkHK~(>G
ON_WM_QUERYDRAGICON() [vb#W!M&|
ON_BN_CLICKED(ID_ABOUT, OnAbout) &${| o@
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R|qNyNXo[
ON_BN_CLICKED(ID_CHANGE, OnChange) z@19gD#8
//}}AFX_MSG_MAP \oxf_4X
END_MESSAGE_MAP() 5 8;OTDR!
CfrO1i F
BOOL CCaptureDlg::OnInitDialog() & }j;SK5
{ (HeSL),1
CDialog::OnInitDialog(); Pr%KcR ;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E,?IIRg&
ASSERT(IDM_ABOUTBOX < 0xF000); zpf<!x^
CMenu* pSysMenu = GetSystemMenu(FALSE); Wy6a4oY
if (pSysMenu != NULL) 4`oKvL9
{ =(TMcu$4`
CString strAboutMenu; 7vPGb:y
strAboutMenu.LoadString(IDS_ABOUTBOX); @Q ~;@M
if (!strAboutMenu.IsEmpty()) yG~Vvpv
{ X[<#B5
pSysMenu->AppendMenu(MF_SEPARATOR); J#@+1 Nt
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e&ZTRgYdi
} \A\?7#9\
} 2,I]H'}^
SetIcon(m_hIcon, TRUE); // Set big icon GK11fZpO:i
SetIcon(m_hIcon, FALSE); // Set small icon s-SFu
m_Key.SetCurSel(0); Z)(#D($-
RegisterHotkey(); jYAm}_?No
CMenu* pMenu=GetSystemMenu(FALSE); ZWuNl!l>
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); INk|NEX
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 17l?li
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xp3^,x;\X
return TRUE; // return TRUE unless you set the focus to a control NzhWGr_x'
} U_aI!`WXd
G1zP^ogk
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) e9:pS WA-n
{ Q8l vwip
if ((nID & 0xFFF0) == IDM_ABOUTBOX) gxI/MD~!>
{ c(8>oeKyD
CAboutDlg dlgAbout; k:j?8o3
dlgAbout.DoModal(); `]19}GK~xo
} M!gu`@@}F
else CUC]-]8
{ #]Do_Z
CDialog::OnSysCommand(nID, lParam); ;cL+=!
} nHXPEbq-g
} /:\27n
4UW)XLu6T7
void CCaptureDlg::OnPaint() 6=Q6J
{ Ax@7RJ||
if (IsIconic()) c-.F{~
{ "[z/\l8O
CPaintDC dc(this); // device context for painting Q-G8Fo%#,E
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~tW<]l7
// Center icon in client rectangle 3_
E}XQd
int cxIcon = GetSystemMetrics(SM_CXICON); Z5wQhhH
int cyIcon = GetSystemMetrics(SM_CYICON); ~pI`_3
CRect rect; wLO"[,
GetClientRect(&rect); D"fjk1
int x = (rect.Width() - cxIcon + 1) / 2; k{Y\YG%b
int y = (rect.Height() - cyIcon + 1) / 2; $OGMw+$C^
// Draw the icon w*@9:+
dc.DrawIcon(x, y, m_hIcon); I~"l9Jc!"
} 1UrkDz?X
else 91a);d
{ f<<$!]\
CDialog::OnPaint(); p ~+sk1[.
} l%
%c U"
} 7:$dl#
4RQ38%> >j
HCURSOR CCaptureDlg::OnQueryDragIcon() 3|3ad'
{ B<@a&QBTg
return (HCURSOR) m_hIcon; MScUrW!TA
} R[vX+d!7
T
I
ZkN6
void CCaptureDlg::OnCancel() ` -W4/7
{ NFur+zwv
if(bTray) V j)"?|V
DeleteIcon(); <A\g*ld
CDialog::OnCancel(); [5b[ztN%
} K6~')9Q
Skux&'N:
void CCaptureDlg::OnAbout() QqeF
{ %hBw)3;l
CAboutDlg dlg; $x+ P)5)
dlg.DoModal(); b4ke'gx
} ZiH4s|
h=NXU9n%'
void CCaptureDlg::OnBrowse() \naG
{ >Ij#+=
CString str; l,b_'
m@
BROWSEINFO bi; qX[C%
char name[MAX_PATH]; +$^[r
ZeroMemory(&bi,sizeof(BROWSEINFO)); [R~@#I P!
bi.hwndOwner=GetSafeHwnd(); M&/e*Ta5
bi.pszDisplayName=name; hNp.%XnnZ
bi.lpszTitle="Select folder"; IeIv k55
bi.ulFlags=BIF_RETURNONLYFSDIRS; lrMkp@f.
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `soQp2h-
if(idl==NULL) *Hh*!ePp
return; hH?ke(&=f
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ) I.uqG
str.ReleaseBuffer(); -fK_F6_\]
m_Path=str; $7Lcn9?G
if(str.GetAt(str.GetLength()-1)!='\\') B,4GxoX`
m_Path+="\\"; FQMA0"(G$
UpdateData(FALSE); lcoJ1+`C
} "KY]2v.
bG)6p05Oa
void CCaptureDlg::SaveBmp() <(~geN
{ bXHtw}n
CDC dc; :{xu_"nYr
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1<M~#
CBitmap bm; ]b^bc2:
int Width=GetSystemMetrics(SM_CXSCREEN); %NL7XU[~
int Height=GetSystemMetrics(SM_CYSCREEN); P\
2Bx *e
bm.CreateCompatibleBitmap(&dc,Width,Height); f5nAD
CDC tdc; &v r0{]V^
tdc.CreateCompatibleDC(&dc); rN {5^+w
CBitmap*pOld=tdc.SelectObject(&bm); `zcpaE.@
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :\1vy5 _
tdc.SelectObject(pOld); W5RZsS]
BITMAP btm; -dUXd<=ue
bm.GetBitmap(&btm); }-WuHh#
DWORD size=btm.bmWidthBytes*btm.bmHeight; wmX * n'l
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Pv8AWQQJ
BITMAPINFOHEADER bih; ^DR`!.ttr
bih.biBitCount=btm.bmBitsPixel; /Dk`?
bih.biClrImportant=0; LkXF~
bih.biClrUsed=0; ??P>HVx
bih.biCompression=0; +$GP(Uu,
bih.biHeight=btm.bmHeight; %vrUk;<35
bih.biPlanes=1; maQOU1
bih.biSize=sizeof(BITMAPINFOHEADER); 8 A #\V
bih.biSizeImage=size; 072`i46
bih.biWidth=btm.bmWidth; !AL?bW
bih.biXPelsPerMeter=0; _3_o/I
bih.biYPelsPerMeter=0; (Z>vbi%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Qhn>aeW,
static int filecount=0; MXY!N/
CString name; 'p'nAB''!
name.Format("pict%04d.bmp",filecount++); 2FTJxSC
name=m_Path+name; $D#eD.
BITMAPFILEHEADER bfh; )$FwB6^
bfh.bfReserved1=bfh.bfReserved2=0; gO!:WD
bfh.bfType=((WORD)('M'<< 8)|'B'); *wz6 2p
bfh.bfSize=54+size; #!M;4~Sfx
bfh.bfOffBits=54; HG})VPBa
CFile bf; mz .uK2l{
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){
ob=IaZ@?
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9KZLlEk5O
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g*:f#u5
bf.WriteHuge(lpData,size); e&="5.ik
bf.Close(); /57)y_ \
nCount++; q?Mmkh)g
} If. hA}
GlobalFreePtr(lpData); cz*Z/5XH
if(nCount==1) 7ZpU -':
m_Number.Format("%d picture captured.",nCount); e p\a
else {UEZ:a
m_Number.Format("%d pictures captured.",nCount); as@I0e((
UpdateData(FALSE); ?s{Pp
} 5A"OL6ty
~FZ=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) '\Hh
{ U_Va'7
if(pMsg -> message == WM_KEYDOWN) sZ7BBJX2K
{ v!?>90a
if(pMsg -> wParam == VK_ESCAPE) jQ?6I1o
return TRUE; I =yy
I
if(pMsg -> wParam == VK_RETURN) z4c{W~}`
return TRUE; nrI-F,1
} vC!}%sxVw_
return CDialog::PreTranslateMessage(pMsg); 'd=B{7k@
} ]1n
=O"vE
w#`E;fN'
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _n_|skG
{ OX)[?1m8
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?Dk&5d^d
SaveBmp(); MHkTN
return FALSE; Kr'5iFK7
} $&iw (BIq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -%^KDyZ<&
CMenu pop; %) 8 UyZG
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bjEm=4FI;
CMenu*pMenu=pop.GetSubMenu(0); &]Q\@;]Aq
pMenu->SetDefaultItem(ID_EXITICON); StJ&YYdD
CPoint pt; YYUWBnf30G
GetCursorPos(&pt); V8.o}BWY
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 8(c,b
if(id==ID_EXITICON) Mm+kG'Z!S
DeleteIcon(); 8 P=z"y
else if(id==ID_EXIT) N
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OnCancel(); qkN{l88
return FALSE; oO8V0VE\
} m#a0HH
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )a%kAUNj
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 'XHKhpm<
AddIcon(); &k4)&LQJ
return res; #4e Taik
} ?tLBEoUmKT
Gn_rf"
void CCaptureDlg::AddIcon() -_RMiGM?T
{ jKI0d+U
NOTIFYICONDATA data; ],HF)21
data.cbSize=sizeof(NOTIFYICONDATA); 5g3D}F>OJ
CString tip; 3;6Criq}
tip.LoadString(IDS_ICONTIP); 2#bpWk 9
data.hIcon=GetIcon(0); -~-BQ!!(
data.hWnd=GetSafeHwnd(); rmOcA
strcpy(data.szTip,tip); CHqRCQR.
data.uCallbackMessage=IDM_SHELL; -kVt_
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l|c#
data.uID=98; M/X&zr
Shell_NotifyIcon(NIM_ADD,&data); *uq;O*s
ShowWindow(SW_HIDE); O%.c%)4Xo
bTray=TRUE; "[ 091 <
} D/1f>sl
nmn 8Y
V1
void CCaptureDlg::DeleteIcon() IO x9".
{ `$*cW1
NOTIFYICONDATA data; oyS43/."
data.cbSize=sizeof(NOTIFYICONDATA); G/:;Qig
data.hWnd=GetSafeHwnd(); A[F tPk{k
data.uID=98; VgHVj)ir
Shell_NotifyIcon(NIM_DELETE,&data); V9tG2mLf>
ShowWindow(SW_SHOW); Jf-4Q!
SetForegroundWindow(); 9K\A4F}
ShowWindow(SW_SHOWNORMAL); SW
^F
bTray=FALSE; #R<ErX)F
} 4]F:QS%
x
y()7m/
void CCaptureDlg::OnChange() D)ZGTq`(
{ H +O7+=&
RegisterHotkey(); DRC2U%[
} jW^@lH
EU
]\y:AkxhJ
BOOL CCaptureDlg::RegisterHotkey() ^x8yWbrE
{ }6;v`1Hr
UpdateData(); Z9MT,
"
UCHAR mask=0; f,ajo
UCHAR key=0; 6^M!p4$hF
if(m_bControl) 2cy: l03
mask|=4; s%K9;(RWI
if(m_bAlt) }i7Gv K<[:
mask|=2; Hp2ysU
if(m_bShift) "Cz8nG
mask|=1; ~@=*JzP?
key=Key_Table[m_Key.GetCurSel()]; G(2(-x"+
if(bRegistered){ vKv!{>,v9Z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); DM3W99PWA
bRegistered=FALSE; Z Sj[GI
} OaeGukhX&
cMask=mask; ]chfa
cKey=key; 8cV3VapF
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8{@0p"re@
return bRegistered; =.Tc
l"O[
} %jgB;Y
}0&@J'<
四、小结 fO+$`r>9
1Y2]jz4
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。