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:
Rs(CrB/M
X6"^:)&1M 一、实现方法
O+UV\ (w@MlMk 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:
eL$U M Kr}M>hF+| #pragma data_seg("shareddata")
c#4L*$ViF HHOOK hHook =NULL; //钩子句柄
PU/Br;2A UINT nHookCount =0; //挂接的程序数目
"3KSmb static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
^5'/ }iR2N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
R4rm>zisVX static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
O|7{%5h static int KeyCount =0;
Ns(L1'9= static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&4Iqm( #pragma data_seg()
p9] 7g% 2ZzD^:V[} 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。
+h vIJv ? "!_
4%z- 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:
^TCJh^4na j[=_1~u} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
re 1k] cKey,UCHAR cMask)
QGCdeE$K {
+]~w ?^h BOOL bAdded=FALSE;
UC
LjR<} for(int index=0;index<MAX_KEY;index++){
H*
L2gw if(hCallWnd[index]==0){
<[B[ hCallWnd[index]=hWnd;
=rO>b{,hs HotKey[index]=cKey;
o:Os_NaD HotKeyMask[index]=cMask;
{@F["YPxy bAdded=TRUE;
8iH;GFNJ7' KeyCount++;
L)nVpqm break;
BnnUUaE }
i11GW }
<W[8k-yOV` return bAdded;
sq6% =(q(? }
{'Qk>G
s //删除热键
(l!D=qy BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-O>mY) {
w5/X{ BOOL bRemoved=FALSE;
`zOAltfd for(int index=0;index<MAX_KEY;index++){
)PoI~km if(hCallWnd[index]==hWnd){
U.j\u>a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
,m'#>d&zO hCallWnd[index]=NULL;
/B?SaKh HotKey[index]=0;
!}Ou|r4_ HotKeyMask[index]=0;
}ok
nB bRemoved=TRUE;
G mUs U{ KeyCount--;
41Q break;
huD\dmQ:] }
]Q_G /e }
4bJ2<j }
#vZ]2Ud=2 return bRemoved;
<GmrKdM }
hz|z&vyP [tf^i:2 6l]?%0[* DLL中的钩子函数如下:
7LZb*+> qsRfG~Cg LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_M4v1Hr48 {
pz6-
hi7 BOOL bProcessed=FALSE;
=|&"/$+s if(HC_ACTION==nCode)
A_*Lo6uII {
`L[32B9 if((lParam&0xc0000000)==0xc0000000){// 有键松开
p1gX4t]%}a switch(wParam)
y!c7y]9__2 {
}b\q<sNE{ case VK_MENU:
IS*"_o<AR MaskBits&=~ALTBIT;
JOne&{h]J" break;
1YD.jU^;HD case VK_CONTROL:
b|@op>UZ MaskBits&=~CTRLBIT;
w,#W&>+& break;
j#>![km Mu case VK_SHIFT:
&EJ,k'7$ MaskBits&=~SHIFTBIT;
W9m[>-Ew break;
Ri6 br default: //judge the key and send message
=ZIFS break;
eV=sDx }
./*,Thc for(int index=0;index<MAX_KEY;index++){
jL).B& if(hCallWnd[index]==NULL)
T:~W.3
continue;
(mD:[|. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tsC|R~wW {
eKti+n. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2DqHqq9m bProcessed=TRUE;
SK}g(X7IWH }
%c2i.E/G }
"/-v 9 }
x[@3;_'K else if((lParam&0xc000ffff)==1){ //有键按下
QAnfxt6 switch(wParam)
R/xCS.yl} {
!4cdP2^P case VK_MENU:
uqeWdj*Y MaskBits|=ALTBIT;
[Et\~'2w8= break;
Z5a@fWU case VK_CONTROL:
CIvT5^} MaskBits|=CTRLBIT;
7Bd_/A($ break;
kL2sJX+ case VK_SHIFT:
nln[V$ MaskBits|=SHIFTBIT;
HZ4
^T7G break;
I[IQFka} default: //judge the key and send message
OiEaVPSI; break;
`rJ ~*7- }
ly5L-=Xb for(int index=0;index<MAX_KEY;index++){
M@[gT?mv1 if(hCallWnd[index]==NULL)
]@T `qR continue;
q8v!{Os+# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Guc^gq} {
cDyC&}:f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
SLA~F?t bProcessed=TRUE;
N!&VBx^z }
PH &ms }
8_$2aqr }
/ hdl if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
U.h PC3 for(int index=0;index<MAX_KEY;index++){
!7*/lG if(hCallWnd[index]==NULL)
Yaepy3F continue;
~'\u:Imuo if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
gy`qEY~B& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
HW,55#yG //lParam的意义可看MSDN中WM_KEYDOWN部分
JY8pV+q @= }
]h$TgX }
p5t#d) }
&c ~)z\$ return CallNextHookEx( hHook, nCode, wParam, lParam );
X^^ D[U }
TL:RB)- < SP1oBR"3 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|L5Ru ,IATJs$E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
hd%F7D5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)`7h,w
J[1 5R
G5uH/-< 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
dj**,*s ]>T/Gl1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
(2)9TpE; {
)
hB*Hjh if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
<L#r6y~H {
[6N39G$ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
VO?NrKyeW SaveBmp();
:?W:'% (`[ return FALSE;
8[IifF1M=& }
&"n9,$ …… //其它处理及默认处理
SVz.d/3Y }
}CqIKoX. lI<8)42yq kO"aE~ 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。
\
.s".aA 4;{CR. D 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。
f#b[KB^Z,2 GdY^}TJrh 二、编程步骤
XL9lB#v^ a8$pc>2E 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
JwVv+9hh th|Q NG 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
aX:$Q
}S e|y~q0Q$ 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;
w Vmy`OV/ nzDY!Y 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;
.JjuY'-Q ^[akB|#\9 5、 添加代码,编译运行程序。
NebZGD2K >X)G`N@! 三、程序代码
H>9$L~ bc-}Qn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
z8MYgn7 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
_?<Fc8F #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
an~Kc!Oki #if _MSC_VER > 1000
KguFU #pragma once
<{uIB;P #endif // _MSC_VER > 1000
YdaJ& #ifndef __AFXWIN_H__
Vtri"G8 aB #error include 'stdafx.h' before including this file for PCH
c?S402M} #endif
d a9 *>+[ #include "resource.h" // main symbols
H;E{Fnarv class CHookApp : public CWinApp
fsu"Lc {
5~QB.m,> public:
R?I3xb CHookApp();
7]bqs"t // Overrides
0T;WN$W| // ClassWizard generated virtual function overrides
=h{2!Ah7
X //{{AFX_VIRTUAL(CHookApp)
dI|/Xm> public:
d0az#Yg! virtual BOOL InitInstance();
$i
Tgv?.Q virtual int ExitInstance();
s<]l[Y> //}}AFX_VIRTUAL
"'(4l 2. //{{AFX_MSG(CHookApp)
P]GGnT(! // NOTE - the ClassWizard will add and remove member functions here.
]f?LQCTq<b // DO NOT EDIT what you see in these blocks of generated code !
0g\&3EvD //}}AFX_MSG
.EQFHStr DECLARE_MESSAGE_MAP()
ln7.>.F };
/2 N%Z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
eKOTxv{ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mH"`46 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kEh# 0 BOOL InitHotkey();
H++rwVwj#h BOOL UnInit();
!5-[kG& #endif
V>Cf
8>m =|/b[Gd( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
K9=_}lS@' #include "stdafx.h"
Ygb#U'| #include "hook.h"
l?~h_8&fT #include <windowsx.h>
Hn)=:lI #ifdef _DEBUG
LtBH4A #define new DEBUG_NEW
HS7!O #undef THIS_FILE
EC0auB7G static char THIS_FILE[] = __FILE__;
r{_'2Z_i #endif
Kkm7L- #define MAX_KEY 100
Khl7Ez #define CTRLBIT 0x04
';%g^!lM
a #define ALTBIT 0x02
WjB[e> #define SHIFTBIT 0x01
qMkP/BjV #pragma data_seg("shareddata")
+nuQC{^> HHOOK hHook =NULL;
$n W>]S\| UINT nHookCount =0;
A
3l1$t#w static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
4w,}1uNEf static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
"yumc5kt static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
!p$V7pFu6 static int KeyCount =0;
Yu=^`I static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
jQhf)B #pragma data_seg()
03PVbDq- HINSTANCE hins;
Z:Wix|,ONS void VerifyWindow();
TH-^tw BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
M<729M //{{AFX_MSG_MAP(CHookApp)
IP3-lru // NOTE - the ClassWizard will add and remove mapping macros here.
yY+2;`CH // DO NOT EDIT what you see in these blocks of generated code!
6dh PqL //}}AFX_MSG_MAP
Velmq'n END_MESSAGE_MAP()
-#r_9HQ,w 1 /`>Eh CHookApp::CHookApp()
Dcf`+?3 {
Cnolka" // TODO: add construction code here,
cD\Qt9EI // Place all significant initialization in InitInstance
h;6@-\6 }
BI
s! :Z)s'd. CHookApp theApp;
T-\,r LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
gM8 eO-d {
-:QyWw/d BOOL bProcessed=FALSE;
`#V"@Go if(HC_ACTION==nCode)
?cJ$= {
jL# ak V if((lParam&0xc0000000)==0xc0000000){// Key up
fITml6mbE switch(wParam)
Vswi /( {
_:z~P<%s case VK_MENU:
>Et?7@
MaskBits&=~ALTBIT;
U6Qeode break;
=cQwR:): case VK_CONTROL:
ATU@5,9 MaskBits&=~CTRLBIT;
qrdI" break;
;dnn
2)m case VK_SHIFT:
#[8gH>7 MaskBits&=~SHIFTBIT;
z(xvt> break;
8P 8"dN[ default: //judge the key and send message
$#!~K2$ break;
#SdaTMLFf }
86Rit!ih for(int index=0;index<MAX_KEY;index++){
OKP?^%kD if(hCallWnd[index]==NULL)
&+
IXDU continue;
~?p
> L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ms$o,[ {
8|l
Yf%n>j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
h\5
7t@A bProcessed=TRUE;
\@xnC$dd/ }
O
Rfl v+ }
-'nx7wnj2 }
)D^P~2 else if((lParam&0xc000ffff)==1){ //Key down
HOw hl switch(wParam)
_eF*8 /z {
Rm
RV8 WJ6 case VK_MENU:
;ry{cq MaskBits|=ALTBIT;
l*eA
?Qz break;
+SJ aE] $ case VK_CONTROL:
%[0"[ <1a MaskBits|=CTRLBIT;
#yqcUbJY0R break;
%tMfOW case VK_SHIFT:
Hq~ 2,#Ue MaskBits|=SHIFTBIT;
L*_xu _F break;
FR <wp default: //judge the key and send message
&`9lIVB,K break;
wK3}K }
B5cTzY.h- for(int index=0;index<MAX_KEY;index++)
oH;Y} h {
eD}Ga4 if(hCallWnd[index]==NULL)
{hl_/
aG continue;
~$@I <=L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6B 8!2 {
A;g[G >J SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
H$;\TG@, bProcessed=TRUE;
q"Xls( }
~2qFA2 }
Ze~\=X" " }
X[|>r@Aa! if(!bProcessed){
/v8qT'$^ for(int index=0;index<MAX_KEY;index++){
;R67a
V, if(hCallWnd[index]==NULL)
":Q70*xSm continue;
wjl?@K
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ED6H SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[AU1JO`\" }
>8,BC }
u66w('2 }
!87ebo return CallNextHookEx( hHook, nCode, wParam, lParam );
"}!vYr }
c" l~=1Dr BYGLYT;Z BOOL InitHotkey()
Wc)^@f[~< {
0+L5k!1D if(hHook!=NULL){
(d ( whlF nHookCount++;
GY!&H"% return TRUE;
Ywni2-)< }
"ZH1W9A else
[-%oO hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3"B|w^6'2 if(hHook!=NULL)
(R0 nHookCount++;
A(C3kISM return (hHook!=NULL);
Ah"RxA }
!ine|NM BOOL UnInit()
)S`A+M K] {
&38Fj'l if(nHookCount>1){
lmod8B nHookCount--;
3:C *'@ return TRUE;
J/mLB7^R }
IXH;QwR: BOOL unhooked = UnhookWindowsHookEx(hHook);
:O{ :;X) if(unhooked==TRUE){
SVR AkP- nHookCount=0;
~r{Nc j hHook=NULL;
gh~C.>W}q+ }
lr|-_snx2 return unhooked;
F'"-4YV>& }
bkY7]'.bz& z*R"917 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?=\h/C {
0/%zXp&m BOOL bAdded=FALSE;
Sy8Og] a
for(int index=0;index<MAX_KEY;index++){
#3qkG) if(hCallWnd[index]==0){
{u!,TDt* hCallWnd[index]=hWnd;
g'I S8@ HotKey[index]=cKey;
*"E]^wCn HotKeyMask[index]=cMask;
is6JS^Q bAdded=TRUE;
ZJx:?*0a KeyCount++;
aB$Y5 break;
2.|Y }
DF-og*V }
Fa;CWyt return bAdded;
\h"s[G zq }
10a=[\ Q F6fm{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M+ H$Jjcs {
$1w8GI\J BOOL bRemoved=FALSE;
'SuYNA) for(int index=0;index<MAX_KEY;index++){
,CCIg9Pt if(hCallWnd[index]==hWnd){
QN0Ik 2L if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SQEXC*08 hCallWnd[index]=NULL;
> sUk6Z~ HotKey[index]=0;
mxXQBmW HotKeyMask[index]=0;
\tQRyj\| bRemoved=TRUE;
&^z~wJ,] KeyCount--;
k1]?d7g$w break;
$H5Xa[ }
]A_)&`"Cb }
+pDuRr }
QK;A>] return bRemoved;
2Qn%p[#n }
V{(ve#y7`{ $biCm$a void VerifyWindow()
1tD4I {
D
F0~A for(int i=0;i<MAX_KEY;i++){
ql],Wplg if(hCallWnd
!=NULL){ K}Aaflq
if(!IsWindow(hCallWnd)){ 'a4xi0**I
hCallWnd=NULL; ^D\#*pIO
HotKey=0; g6nBu
HotKeyMask=0; FzW(An&x2
KeyCount--; '!Q[+@$
} m!v`nw ]
} `m3C\\9;
} cA_v*`YL
} YKj7~yK?
6n<:ph,h;
BOOL CHookApp::InitInstance() PF4Cs3m/
{ ;@Ls"+g
AFX_MANAGE_STATE(AfxGetStaticModuleState()); R$v{ p[
hins=AfxGetInstanceHandle(); y|c]r!A
InitHotkey(); )=8X[<^i
return CWinApp::InitInstance(); Ib]{rmaP
} <Y9ps`{}:
y%iN9 -t
int CHookApp::ExitInstance() ?e yo2:-$
{ tZ4W]od
VerifyWindow(); @|r*yi
UnInit(); ~,dj)x
3M
return CWinApp::ExitInstance(); \9<aCJxN
} ck-wMd
eBG7]u,Q
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file <+C]^*j
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,HR~oT^
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c7S<ex,
#if _MSC_VER > 1000 oE)tK1>;H
#pragma once |f.=Y~aY
#endif // _MSC_VER > 1000 8!E$0^)c|
hE+6z%A8
class CCaptureDlg : public CDialog i3N _wv{
{ 8la.N*
// Construction s+^YGB
public: Cd]d[{NJ;
BOOL bTray; Hz!+g'R!Gs
BOOL bRegistered; J7_'@zU
BOOL RegisterHotkey(); |$^,e%bE
UCHAR cKey; CQQX7Y\
UCHAR cMask; ?}lgwKBHl;
void DeleteIcon(); PUF"^9v
void AddIcon(); @C7#xGD
UINT nCount; -Z)$].~|t
void SaveBmp(); 1KAA(W;nq
CCaptureDlg(CWnd* pParent = NULL); // standard constructor hekAics6S
// Dialog Data 9kWyO:a_(
//{{AFX_DATA(CCaptureDlg) "pQM$3n(
enum { IDD = IDD_CAPTURE_DIALOG }; ey@y?X=
CComboBox m_Key; XBdC/DM[
BOOL m_bControl; :/K 'P`JaL
BOOL m_bAlt; )
^!oM
BOOL m_bShift; L*Xn!d%
CString m_Path; u7<B*d:
CString m_Number; :$j!e#?=
//}}AFX_DATA 0q>f x
// ClassWizard generated virtual function overrides (SU*fD!t
//{{AFX_VIRTUAL(CCaptureDlg) ?7YX@x
public: O"nY4
virtual BOOL PreTranslateMessage(MSG* pMsg); t? yMuK
protected: o#4Wn'E
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ko>SnE|w#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u,*$n'l]
//}}AFX_VIRTUAL `LVXK|m+ $
// Implementation :~{XL >:S
protected: *Iyv${
HICON m_hIcon; #sq -V,8
// Generated message map functions )|q,RAn
//{{AFX_MSG(CCaptureDlg) gXE'3
virtual BOOL OnInitDialog(); #}^ZxEU
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tlA4oVII
afx_msg void OnPaint(); 6oL-Atf
afx_msg HCURSOR OnQueryDragIcon(); kS8srT
/H
virtual void OnCancel(); U"<Z^)
afx_msg void OnAbout(); ^-f5;B`\i
afx_msg void OnBrowse(); [yf2_{*0T
afx_msg void OnChange(); 4Q,HhqV'
//}}AFX_MSG d]}
7]
DECLARE_MESSAGE_MAP() f)vD2_E
}; _+T;4U'p
#endif }$Q+x'
I,l%6oPa
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <YUc?NF
#include "stdafx.h" ~i=/@;wRp
#include "Capture.h" &YmOXKf7
#include "CaptureDlg.h" Wu2#r\
#include <windowsx.h> !3-mPG<
]
#pragma comment(lib,"hook.lib") J3}^\k=p"
#ifdef _DEBUG ^>72<1U%
#define new DEBUG_NEW mO?G[?*\
#undef THIS_FILE i/,G=yA
static char THIS_FILE[] = __FILE__; ?MPM@9
#endif yaa+j8s]
#define IDM_SHELL WM_USER+1 ;^=eiurv
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tV[?WA[xt
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IhJ _Yed
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aL-V 9y
class CAboutDlg : public CDialog +)qPUKb?
{ i6h:%n]Io
public: W7O%.xP
CAboutDlg(); Fu^^Jex
// Dialog Data
i/y+kL
//{{AFX_DATA(CAboutDlg) C.C\(2- Rr
enum { IDD = IDD_ABOUTBOX }; UY+~,a
//}}AFX_DATA YM1tP'4j@
// ClassWizard generated virtual function overrides nx
$?wxIm
//{{AFX_VIRTUAL(CAboutDlg) H)
m!)=\'
protected: bqS*WgMY-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tJ&S&[}
//}}AFX_VIRTUAL `Rm2G
// Implementation <*3wnpj_
protected: 8Nd +
//{{AFX_MSG(CAboutDlg) Ud*.[GRD~
//}}AFX_MSG 4T Gg`$e;
DECLARE_MESSAGE_MAP() Rdwr?:y(]
}; -+'{C=
oMkB!s
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1&i!92:E
{ :uu\q7@'
//{{AFX_DATA_INIT(CAboutDlg) -XPGl
//}}AFX_DATA_INIT ?N,a {#w
} V tZ
f|m.v
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) P7 (&*=V
{ .: 87B=
CDialog::DoDataExchange(pDX); b1\z&IdC
//{{AFX_DATA_MAP(CAboutDlg) |b'tf:l
//}}AFX_DATA_MAP q.K >v'
} h:a5FK@
G\*`EM4
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) pZlBpGQf
//{{AFX_MSG_MAP(CAboutDlg) RLw=y{%p
// No message handlers ?9Fv0-g&n
//}}AFX_MSG_MAP b?B"u^b!
END_MESSAGE_MAP() MGN*i9CE
6X7r=w
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'gI58#v
: CDialog(CCaptureDlg::IDD, pParent) NO`LSF
{ C/<fR:`c
//{{AFX_DATA_INIT(CCaptureDlg) lY?TF
m_bControl = FALSE; ;Zw!
m_bAlt = FALSE; ENA8o}n
m_bShift = FALSE; ##}a0\x|
m_Path = _T("c:\\"); ` *$^rQS
m_Number = _T("0 picture captured."); E+JGqk
nCount=0; hy
W4=
bRegistered=FALSE; qf4|!UR{
bTray=FALSE; u'yePJTE
//}}AFX_DATA_INIT S8.nM}x
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kYPowM
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e%wbUr]c2
} ;9,Ll%Lk<
&y3_>!L
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) XL EA|#
{ 0:v7X)St
CDialog::DoDataExchange(pDX); `S;pn+5
//{{AFX_DATA_MAP(CCaptureDlg) .zBSjh_=H
DDX_Control(pDX, IDC_KEY, m_Key); */O6cF7
DDX_Check(pDX, IDC_CONTROL, m_bControl); k(u W( 6
DDX_Check(pDX, IDC_ALT, m_bAlt); _$MoMg{uJH
DDX_Check(pDX, IDC_SHIFT, m_bShift); D dt9`j
DDX_Text(pDX, IDC_PATH, m_Path); ?#J~X\5
DDX_Text(pDX, IDC_NUMBER, m_Number); GrVvOJr
//}}AFX_DATA_MAP gl2~6"dc
} J\m7U
dH#o11[
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) rf1-E5 7#
//{{AFX_MSG_MAP(CCaptureDlg) V9B $_j4
ON_WM_SYSCOMMAND() p1J%=
ON_WM_PAINT() A3C<9wXx
ON_WM_QUERYDRAGICON()
UCvMW*gs
ON_BN_CLICKED(ID_ABOUT, OnAbout) w`F}3zm
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Qnr' KbK
ON_BN_CLICKED(ID_CHANGE, OnChange) 8$?a?7,>|
//}}AFX_MSG_MAP u^!-Z)W
END_MESSAGE_MAP() { F.Ihw
pg4M$;ED
BOOL CCaptureDlg::OnInitDialog() TQID-I
{ Xa9G;J$
CDialog::OnInitDialog(); xQWZk`6~L
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ={#r/x
ASSERT(IDM_ABOUTBOX < 0xF000); ,h8)5Mj/J
CMenu* pSysMenu = GetSystemMenu(FALSE); |Vd)7/LN
if (pSysMenu != NULL) 5x=tOR/h
{ A4%0
CString strAboutMenu; Bk?M F6
strAboutMenu.LoadString(IDS_ABOUTBOX); ',J3^h!b
if (!strAboutMenu.IsEmpty()) DC[-<:B
{ :t\PYDp1
pSysMenu->AppendMenu(MF_SEPARATOR); MFE~bU(h
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A3Ltk 2<
} 7v%~^l7:x
} `(*5yX C
SetIcon(m_hIcon, TRUE); // Set big icon ]9;WM.
SetIcon(m_hIcon, FALSE); // Set small icon 3<'SnP3mY
m_Key.SetCurSel(0); l#]Z?zW.
RegisterHotkey(); "}Ya.
CMenu* pMenu=GetSystemMenu(FALSE); |`:Uww+3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~3/>;[!
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); H^'*F->BA
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .i[Tp6'%,
return TRUE; // return TRUE unless you set the focus to a control L7a+ #mGE
} s{$c 8
!C#q
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -kQ{~">w
{ X}
8rrC=
if ((nID & 0xFFF0) == IDM_ABOUTBOX) V1#/+~
{ dIIsO{Zqv
CAboutDlg dlgAbout; mIl^
dlgAbout.DoModal(); O6k[1C
} j_p.KF'[?
else <t]i'D(K
{ r&Za*TD^
CDialog::OnSysCommand(nID, lParam); "qQU ^FW
} -pa.-@
} ed>_=i
NWX~@Rg
void CCaptureDlg::OnPaint() d3^LalAp
{ ~mmI]
pC
if (IsIconic()) !Y`nKC(=z
{ {l_R0
CPaintDC dc(this); // device context for painting B\Rq0N]' M
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |Q.?<T:wt=
// Center icon in client rectangle :jB(!XH
int cxIcon = GetSystemMetrics(SM_CXICON); ,ulTZV
int cyIcon = GetSystemMetrics(SM_CYICON); 1`B5pcuI
CRect rect; *A
c~
GetClientRect(&rect); bF?EuL
int x = (rect.Width() - cxIcon + 1) / 2; ~>s^/`|?
int y = (rect.Height() - cyIcon + 1) / 2; 6Y\9h)1Jo
// Draw the icon ^>[DG]g
dc.DrawIcon(x, y, m_hIcon); v8-F;>H
} \!z=x#!O$
else w#XE!8`
{ P#rwYPww\
CDialog::OnPaint(); 8m-jU
5u
} +z("'Cv
} b\]"r x
(
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HCURSOR CCaptureDlg::OnQueryDragIcon() OXA_E/F
{ cGOE $nL
return (HCURSOR) m_hIcon; YN"102CK
} gh i!4
G}D?+MWY
void CCaptureDlg::OnCancel() dpE\eXoa,
{ >G/>:wwSP.
if(bTray) )k29mqa`
DeleteIcon(); P{QRmEE
CDialog::OnCancel(); gjyg`%
} $@8\9Y
{
}[ux4cd8Y
void CCaptureDlg::OnAbout() +=u*!6S
{ ?uQ|?rk
CAboutDlg dlg; bis/Nfr]
dlg.DoModal(); 3S'V>:
} #Yj0'bgK
~3f#cEP>d}
void CCaptureDlg::OnBrowse() Er{[83
{ jnH44
CString str; h/-7;Csv
BROWSEINFO bi; 3^1)W!n/
char name[MAX_PATH]; \EB]J\x<
ZeroMemory(&bi,sizeof(BROWSEINFO)); fp12-Hk ~
bi.hwndOwner=GetSafeHwnd(); Arfq
bi.pszDisplayName=name; ] ^
bi.lpszTitle="Select folder"; >2$Ehw:K^
bi.ulFlags=BIF_RETURNONLYFSDIRS; `Rj
i=k>
LPITEMIDLIST idl=SHBrowseForFolder(&bi); P]dDTh~e~
if(idl==NULL) 7^|3TTK
return; r]0 o
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q. BqOa:
str.ReleaseBuffer(); \hNMTj#O
m_Path=str; o#0NIn"GS/
if(str.GetAt(str.GetLength()-1)!='\\') :MJBbrV
,
m_Path+="\\"; 1{";u"q
UpdateData(FALSE); /xsa-F
} nW|[poQK
1Rp|*>
void CCaptureDlg::SaveBmp() @&EE/j^
{ X8;03EW;
CDC dc; j#!J
hi
dc.CreateDC("DISPLAY",NULL,NULL,NULL); WYaDN:kZf
CBitmap bm; ZMx_J
int Width=GetSystemMetrics(SM_CXSCREEN); ;y5cs;s
int Height=GetSystemMetrics(SM_CYSCREEN); rM>&!?y+
bm.CreateCompatibleBitmap(&dc,Width,Height); 8|7Tk[X1j
CDC tdc; "#e2"=3*
tdc.CreateCompatibleDC(&dc);
-U*XA
CBitmap*pOld=tdc.SelectObject(&bm); xn}'!S2-b
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4eIu@
";!
tdc.SelectObject(pOld); u c7Y8iO
BITMAP btm; o5Qlp5`:u
bm.GetBitmap(&btm); Aoa0czC~
DWORD size=btm.bmWidthBytes*btm.bmHeight; Eda
sGCo
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T<! `~#kM
BITMAPINFOHEADER bih; Zjo9c{\
bih.biBitCount=btm.bmBitsPixel; 70KXBu<6
bih.biClrImportant=0; T6phD8#
bih.biClrUsed=0; Pv0OoN*eJ{
bih.biCompression=0; xR1g
bih.biHeight=btm.bmHeight; d5zzQ]|L
bih.biPlanes=1; #UXmTrZ.
bih.biSize=sizeof(BITMAPINFOHEADER); 7c;59$2(
bih.biSizeImage=size; Y{p *$
bih.biWidth=btm.bmWidth; < W&~tVv
bih.biXPelsPerMeter=0; [N7[%iQ%
bih.biYPelsPerMeter=0; >Zmpsa+
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;=uHK'{
static int filecount=0; -@J;FjrXmP
CString name; eMh:T@SN
name.Format("pict%04d.bmp",filecount++); j j$'DZk
name=m_Path+name; ?58pkg J
BITMAPFILEHEADER bfh; v3]q2*`G#
bfh.bfReserved1=bfh.bfReserved2=0; ]L_HnmD6
bfh.bfType=((WORD)('M'<< 8)|'B'); EB> RY+\
bfh.bfSize=54+size; possM'vC
bfh.bfOffBits=54; pr;L~$JW
CFile bf; C($`'~b
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ EkTen:{G
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); H_*]Vg
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4|:{apH
bf.WriteHuge(lpData,size); =#+Z KD
bf.Close(); %F}`;>C3
nCount++; ~$Mp >ZB2W
} PDpIU.=!0
GlobalFreePtr(lpData); ;
9'*w=V
if(nCount==1) 5T8!5EcS*
m_Number.Format("%d picture captured.",nCount); hw1ZTD:Y
else ec]ksw6T+
m_Number.Format("%d pictures captured.",nCount); o[cKh7&+
UpdateData(FALSE); 7q67_u?@
} a.]
!
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^ePSI|EW
{ 4Y)3<=kDG
if(pMsg -> message == WM_KEYDOWN) ipbVQ7
{ 5`z{A
if(pMsg -> wParam == VK_ESCAPE) }RoM N$r
return TRUE; OI`Lb\8pP
if(pMsg -> wParam == VK_RETURN) 2{#quXN9
return TRUE; PGw"\-F
} L50`,,WF
return CDialog::PreTranslateMessage(pMsg); Z-vzq;
} x?j&Jn_@w
_6(zG.Fg
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f0^s*V+
{ ,-{j.
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ T+~~w'v0
SaveBmp(); 3~ZtAgih%
return FALSE; {{
wVM:1
} p@Qzg
/X
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d[o =
CMenu pop; \Xkx`C
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [S<DdTY9hZ
CMenu*pMenu=pop.GetSubMenu(0); \dfq&oyU\
pMenu->SetDefaultItem(ID_EXITICON); @*c+`5)_
CPoint pt; gB0)ec 0
GetCursorPos(&pt); Aa1 |{^$:L
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); klx4Mvq+/@
if(id==ID_EXITICON) Mv9s
DeleteIcon();
Cw+ (,1
else if(id==ID_EXIT) "`3H0il;<
OnCancel(); \XpPb{:>
return FALSE; j$L<9(DoR
} I5bi^!i
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d?S<h`{x
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B@s\>QMm
AddIcon(); U5"F1CaW~
return res; rVN|OLh
} NuP@eeF>,
g`Rs;
void CCaptureDlg::AddIcon() !~mN"+u&
{ lRO8}XSI
NOTIFYICONDATA data; w6cPd'
data.cbSize=sizeof(NOTIFYICONDATA); >*_?^F_
CString tip; L@2H>Lh35
tip.LoadString(IDS_ICONTIP); leD?yyjw7
data.hIcon=GetIcon(0); r@!~l1$s`
data.hWnd=GetSafeHwnd(); =9)ypI-2
strcpy(data.szTip,tip); 4,aBNuxWd
data.uCallbackMessage=IDM_SHELL; B"EMir'
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S9L3/P]
data.uID=98; Ti'O 2k
Shell_NotifyIcon(NIM_ADD,&data); od|pI5St
ShowWindow(SW_HIDE); zO+nEsf^O
bTray=TRUE; U}5uy9A
} \u)(+t{
-S|L+">=Z
void CCaptureDlg::DeleteIcon() ;N
j5N B7
{ l,/5$JGnk
NOTIFYICONDATA data; ?Rwn1.Z
data.cbSize=sizeof(NOTIFYICONDATA); r*3;gyG.,#
data.hWnd=GetSafeHwnd(); 6-JnT_
data.uID=98; \(z)]D
Shell_NotifyIcon(NIM_DELETE,&data); e@q[Dv'mu
ShowWindow(SW_SHOW); *|jqRfa"
SetForegroundWindow(); 77
`/YE#M
ShowWindow(SW_SHOWNORMAL); <bid 6Q0|
bTray=FALSE; -p)HH@6a
} )V>FU=
! [: K/
void CCaptureDlg::OnChange() Cr[#D$::`
{ #uH1!UQb
RegisterHotkey(); =]^*-f}J9
} 7 yi >G
{66vdAu&h<
BOOL CCaptureDlg::RegisterHotkey() Z$pR_dazU
{ 0\mM^+fO
UpdateData(); p1&d@PF&&
UCHAR mask=0; ())|x[>JS+
UCHAR key=0; _&:o"""Wf
if(m_bControl) r|P4|_No
mask|=4; &?9.Y,
if(m_bAlt) ZWr\v!4
mask|=2; cg$~.ytPK
if(m_bShift) Y6CadC
mask|=1; /TB_4{
key=Key_Table[m_Key.GetCurSel()]; PEBQ|k8g&
if(bRegistered){ f{+8]VA
DeleteHotkey(GetSafeHwnd(),cKey,cMask); z1L.
bRegistered=FALSE; %d=-<EQ|&
} ^@)+P/&
cMask=mask; w
S;(u[W
cKey=key; KL|B| u
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <n#JOjHV
return bRegistered; .f6_[cS;g
} M35}5+
PffwNj/l
四、小结 R8?A%yxf
gNO$WY^
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。