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:
"p.MJxH
vmAMlgZ8{< 一、实现方法
y`:}~nUdT !cE>L~cza 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:
H:#b(&qw2 LT!B]y #pragma data_seg("shareddata")
YoGnk^$ HHOOK hHook =NULL; //钩子句柄
D^=_408\ UINT nHookCount =0; //挂接的程序数目
\MsAdYR
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
+
htTrHjt static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Mr<2I static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Wd~aSz9 static int KeyCount =0;
F)j-D(c4 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&zlwV"W #pragma data_seg()
}+#-\a2 5(1Zj`>' 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。
`Q1S8i$ qw&Wfk\} 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:
]G1{@r) <?&GBCe BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
j*x8K,fN cKey,UCHAR cMask)
"u Xl {
bWt>tEnf BOOL bAdded=FALSE;
yTz@q>6s- for(int index=0;index<MAX_KEY;index++){
<_uLf9ja if(hCallWnd[index]==0){
t] P[>{y hCallWnd[index]=hWnd;
?Vb=W)Es HotKey[index]=cKey;
'$ ~.x| HotKeyMask[index]=cMask;
Z}T<^
F bAdded=TRUE;
%Xh/16X${ KeyCount++;
Y]{<IF:
break;
xM9EO(u }
r7c(/P^$G }
=#&K\ return bAdded;
v$K`C; }
=<_xUh. //删除热键
L=iaL[zdJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
00Tm0rY {
:J@q
Xa BOOL bRemoved=FALSE;
muQH!Q for(int index=0;index<MAX_KEY;index++){
[VT& if(hCallWnd[index]==hWnd){
$R2T) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
e,={!P"f hCallWnd[index]=NULL;
K%Mm'$fTw HotKey[index]=0;
WiH%URFB HotKeyMask[index]=0;
m( C7Fa bRemoved=TRUE;
({yuwH?tH KeyCount--;
Cmm"K[>Rx break;
LU_@8i: }
ilw<Q-o4( }
KM g`O3_16 }
8Z4d<DIJ return bRemoved;
[y\ZnoB }
X1]&j2WR d;|e7$F' 8X!UtHml DLL中的钩子函数如下:
/wK5YN.em [`_&d7{-4b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
30*^ERO {
/,"Z^= BOOL bProcessed=FALSE;
$JypVA(CX if(HC_ACTION==nCode)
p^&' C_? {
$lOx
6rL if((lParam&0xc0000000)==0xc0000000){// 有键松开
f-y4V} switch(wParam)
-OB72!sKU {
}Jk.c~P) case VK_MENU:
7ks09Cy MaskBits&=~ALTBIT;
+uM1#-+h break;
ge`)sB, case VK_CONTROL:
95_?F7}9 MaskBits&=~CTRLBIT;
SIKy8?Fn break;
COOazXtW case VK_SHIFT:
VCiJ]$`M MaskBits&=~SHIFTBIT;
'X_iiR8n@p break;
@z EEX9U default: //judge the key and send message
DdJxb{y7 break;
z_*]joL }
?;0=>3p*0 for(int index=0;index<MAX_KEY;index++){
g:q+.6va" if(hCallWnd[index]==NULL)
n>Y3hY continue;
|b;}'
* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q
nDy mVF {
HW|c -\tS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!aeL*`; bProcessed=TRUE;
;wbQTp2 }
z tHGY }
ibl^A= }
}H?8~S= else if((lParam&0xc000ffff)==1){ //有键按下
O4@Ki4f3A% switch(wParam)
{ Y|h;@j$ {
NS#qein~i case VK_MENU:
%;!@\5$ MaskBits|=ALTBIT;
xp7,0'(; break;
doBfpQ2 case VK_CONTROL:
o$\{&:y MaskBits|=CTRLBIT;
y+(<Is0w break;
T$06DS case VK_SHIFT:
H:`W\CP7_ MaskBits|=SHIFTBIT;
D=mU!rjr1 break;
25l6@7q. default: //judge the key and send message
+>.plvZhu break;
fNFdZ[qOd }
H.7gSB 1 for(int index=0;index<MAX_KEY;index++){
?Gp~i] if(hCallWnd[index]==NULL)
L4zSro:Si continue;
ldM [8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3Ym5SrKK {
w^ui%9
&6H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K-)*S\<} bProcessed=TRUE;
5hB&]6n }
~{n_rKYV }
%+w>`k3(N }
m1gJ"k6
`j if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:)c >5 for(int index=0;index<MAX_KEY;index++){
YdV5\! if(hCallWnd[index]==NULL)
n8w|8[uV^ continue;
tRS^|?? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Ve2z= 6( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$9y]>R //lParam的意义可看MSDN中WM_KEYDOWN部分
'P)xY-15 }
n #p6i }
A%"XN k }
s Ce7ni return CallNextHookEx( hHook, nCode, wParam, lParam );
)"WImf:*
}
kNI m90,g 7t\kof 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
V{HZ/p_Y .Ap[C? mV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
c?}C{ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3! dD!'
p[0Ws460 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
O!d^v9hM, x-nwo:OA LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
9'3bzhT$ {
&&ecq if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
|}es+<P {
9K#.0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
P;VR[d4e/ SaveBmp();
j~\\,fl= return FALSE;
[=Np.:Y% }
( {m["d …… //其它处理及默认处理
YJuaQxs }
K>RL GL@s~_;T6 0+/L?J3 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。
<z#r3J cK(}B_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。
IQGIU3O [dk|lkj@u\ 二、编程步骤
.W,<]L '
A{>]M@QC2 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";
<9"s&G@
3cT 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
>%qGK-_ Wfu%,=@, 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;
ZA2y IqfR`iAix 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;
cOOPNa>5_ ?b#/*T}ac 5、 添加代码,编译运行程序。
_L_SNjA_ &m'O :ZS2 三、程序代码
PX?tD:,[- YCh!D dy ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
9`{Mq9J #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
&VR<'^> #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
J0@m
Ol #if _MSC_VER > 1000
+O j28vR #pragma once
To}L%) #endif // _MSC_VER > 1000
U(3LeS;mr #ifndef __AFXWIN_H__
PgB=<#9 #error include 'stdafx.h' before including this file for PCH
5G(y #endif
MG8-1M #include "resource.h" // main symbols
bkmX@+Pe class CHookApp : public CWinApp
@`%.\_ {
#@2 `^1 public:
/iy2j8:z CHookApp();
/J/r 62 // Overrides
W;~^3Hz6 // ClassWizard generated virtual function overrides
K._1sOw'"Y //{{AFX_VIRTUAL(CHookApp)
,{J2i#g< public:
6C
r$R]5 virtual BOOL InitInstance();
/W:}p(>4a virtual int ExitInstance();
PM9HfQU? //}}AFX_VIRTUAL
)lB-D;3[_ //{{AFX_MSG(CHookApp)
zFP}=K:o) // NOTE - the ClassWizard will add and remove member functions here.
}9Y='+.%^ // DO NOT EDIT what you see in these blocks of generated code !
aR}NAL_`w //}}AFX_MSG
&Radpb2p6 DECLARE_MESSAGE_MAP()
at7/KuY!~ };
ai#EFo+# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
lCd^|E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ut3jIZ1] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0AR4/5. BOOL InitHotkey();
SkvKzV.R; BOOL UnInit();
(ter+rTv #endif
h2=zvD; y"t5%Iv //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
OX8jCW #include "stdafx.h"
%6Hn1'7+v #include "hook.h"
iW*0V3 #include <windowsx.h>
S:Yo9~ #ifdef _DEBUG
H#w?$?nIWu #define new DEBUG_NEW
=%2 E|/ #undef THIS_FILE
dr'6N1B@ static char THIS_FILE[] = __FILE__;
#GWQ]r? #endif
I62Yg
p$K #define MAX_KEY 100
>x!N[N@G #define CTRLBIT 0x04
yMo@ka=v #define ALTBIT 0x02
}f6.eqBX4 #define SHIFTBIT 0x01
"T~Ps$ #pragma data_seg("shareddata")
oL VtP HHOOK hHook =NULL;
laFkOQI UINT nHookCount =0;
YJ1P5u: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ef!I |.FW static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
?hfosBn&[ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
z,2m7C static int KeyCount =0;
JpSS[pOg static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
AiO,zjM = #pragma data_seg()
NiyAAw HINSTANCE hins;
W@UHqHr:\ void VerifyWindow();
oiFtPki BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
<D&75C# //{{AFX_MSG_MAP(CHookApp)
\u)s Zh // NOTE - the ClassWizard will add and remove mapping macros here.
*YtITyDS3> // DO NOT EDIT what you see in these blocks of generated code!
Y61E|:fV! //}}AFX_MSG_MAP
P!]DV$o END_MESSAGE_MAP()
mtTJm4 q=[0`--cd CHookApp::CHookApp()
WX?|iw
I~ {
wHIS}OONz // TODO: add construction code here,
bgEUG // Place all significant initialization in InitInstance
M4DRG%21 }
T.K$a\/{, ,u\M7,a^ CHookApp theApp;
Ex<-<tY LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
kB :")$ {
fE^rTUtn BOOL bProcessed=FALSE;
){ wE)NN if(HC_ACTION==nCode)
RrRCT.+E {
$ cK9E:v if((lParam&0xc0000000)==0xc0000000){// Key up
zL7+HY*3o switch(wParam)
nR
,j1IUF {
^KlMBKWyB case VK_MENU:
=v8#@$ MaskBits&=~ALTBIT;
wk-ziw break;
H"n"Q:Yp case VK_CONTROL:
Llg[YBJ7> MaskBits&=~CTRLBIT;
/5wvXk|@ break;
7H./o Vl case VK_SHIFT:
hd^?svID MaskBits&=~SHIFTBIT;
'zpj_QM break;
5HJ6[.HO default: //judge the key and send message
f+F /`P% break;
`Th!bk }
98V9AOgk for(int index=0;index<MAX_KEY;index++){
~rKo5#D if(hCallWnd[index]==NULL)
|yqx
] continue;
fx=aT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rZzto;NDS {
o"5R^a@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IJ=~hBI bProcessed=TRUE;
FC)aR[ }
VT-&"Jn }
KDCq::P< }
ybB/sShGM else if((lParam&0xc000ffff)==1){ //Key down
n:; 2Z switch(wParam)
~+4OG 0 {
r5r K> case VK_MENU:
bup;4~g MaskBits|=ALTBIT;
Ig S.U break;
c%v%U & case VK_CONTROL:
/Nxy?g|, MaskBits|=CTRLBIT;
sV{[~U,| break;
;O.U-s case VK_SHIFT:
``zg |h MaskBits|=SHIFTBIT;
,.F,]m= break;
Gn&)*qCO default: //judge the key and send message
<0Q`:'\.> break;
UT>\u }
\1|T for(int index=0;index<MAX_KEY;index++)
&@{Ba~S {
=f{r+'[;^ if(hCallWnd[index]==NULL)
2MJ0[9 continue;
J *^|ojX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yyBfLPXZ {
18|H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
\O\onvEa bProcessed=TRUE;
r@iGMJx$ }
6Zkus20 }
I`FH^= }
L5PN]<~T if(!bProcessed){
P 7gS
M for(int index=0;index<MAX_KEY;index++){
JYKaF6bx8 if(hCallWnd[index]==NULL)
h-#Glse< continue;
^oPf>\),C if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
gLu#M:4N SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
g.&&=T }
|J~;yO SD }
jh}[7M }
8[xb+_ return CallNextHookEx( hHook, nCode, wParam, lParam );
8m-ryr) }
+
PGfQN J]Uki*s BOOL InitHotkey()
'{Iv?gh" {
g+)T\_#u if(hHook!=NULL){
']4sx_)S nHookCount++;
{TlS)i` return TRUE;
qhiQ!fMQ }
V#5BZU- else
~Kt.%K5lgt hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
\e ( h6,@ if(hHook!=NULL)
<7u*OYjA nHookCount++;
_
@ \ return (hHook!=NULL);
.Ml}cE$L }
]cFqKs BOOL UnInit()
eWcS>N {
e7 5*84 if(nHookCount>1){
HJoPk'p% nHookCount--;
{ \r{$<s return TRUE;
])T*T$u }
lvk(q\-f BOOL unhooked = UnhookWindowsHookEx(hHook);
+loD{
if(unhooked==TRUE){
IO|">a6 nHookCount=0;
4,TS1H hHook=NULL;
/GfC/)1_ }
TzerAX^ return unhooked;
uFG]8pj2V1 }
l}Jf;C*j1z kS3wa3bT BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Bd)Qz(>rw {
S}ZM;M BOOL bAdded=FALSE;
cfpP? for(int index=0;index<MAX_KEY;index++){
^;Ap-2Ww if(hCallWnd[index]==0){
;o"}7'4*R% hCallWnd[index]=hWnd;
O_(/uLH HotKey[index]=cKey;
[ @& HotKeyMask[index]=cMask;
JdFMSmZ@ bAdded=TRUE;
~Ui<y=d KeyCount++;
wD}[XE?S break;
}.MJVB3 }
o= N= W }
~kw[Aw3?D\ return bAdded;
-=O9D-x= }
`'.u$IBW )!){4c/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sf7'8+wj> {
)\'U$ BOOL bRemoved=FALSE;
[ gx<7}[ for(int index=0;index<MAX_KEY;index++){
>*{\N^:z if(hCallWnd[index]==hWnd){
U!^\DocAY if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Kh'/Ne? hCallWnd[index]=NULL;
jsfyNl?6 HotKey[index]=0;
w/E4wp HotKeyMask[index]=0;
J{\S+O2,* bRemoved=TRUE;
DRj\i6-v KeyCount--;
Xn9TQ"[4 break;
C] \r~f }
h+}`mi }
%Mz(G-I.\ }
`A$yF38! return bRemoved;
mEr*n }
ub0]nov buG0#: void VerifyWindow()
"JKrbgN@;L {
T&X*[kP for(int i=0;i<MAX_KEY;i++){
M($dh9 A_ if(hCallWnd
!=NULL){ v8Bi 1,g
if(!IsWindow(hCallWnd)){ D8C@x`
hCallWnd=NULL;
lrU}_`
HotKey=0; tWdj"n%
HotKeyMask=0; UYD(++
KeyCount--; Z?O aY4
} lmo>z'<
} Xc"S"a^\%
} TY5<hPU=
} 2?nK71c"
U}_l]gNn
BOOL CHookApp::InitInstance() +#A>[,U
{ j'#W)dp(
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9)3ok#pQ/
hins=AfxGetInstanceHandle(); MjQKcL4%7
InitHotkey(); Vq -!1.v3
return CWinApp::InitInstance(); rwv_
RN
} 2.Th29]
tB8XnO_c
int CHookApp::ExitInstance() K q: +{'
{ H&6lQ30/)
VerifyWindow(); _t'Kj\
UnInit(); 6 80i?=z
return CWinApp::ExitInstance(); `6?r.;wj
} >-c ;
v|<Dc8i+
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 71mdU6Kq
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1 nIb/nY
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ BO5F6lyQ0P
#if _MSC_VER > 1000 =YR/X@&
#pragma once 3)Wi?
-
#endif // _MSC_VER > 1000 7-nwfp&|$
593D/^}D
class CCaptureDlg : public CDialog %o.{h
{ GL(R9Y
// Construction c{ +Y$
public: xoA\^AA
BOOL bTray; 4Fgy<^94`
BOOL bRegistered; xbxU`2/
BOOL RegisterHotkey(); q]`XUGC
UCHAR cKey; 3^xTZ*G
UCHAR cMask; Xd!=1::
void DeleteIcon(); Azxy!gDT"
void AddIcon(); ^
RU"v>
UINT nCount; "|gNNmr
void SaveBmp(); bT@3fuL4
CCaptureDlg(CWnd* pParent = NULL); // standard constructor P"cc$lB~ I
// Dialog Data hS OAjS
//{{AFX_DATA(CCaptureDlg) #O7|&DqF{
enum { IDD = IDD_CAPTURE_DIALOG }; &|LZ%W0Fb
CComboBox m_Key; cP`o?:
BOOL m_bControl; U(dT t
BOOL m_bAlt; aF;QSI
BOOL m_bShift; -^Baxkq(YM
CString m_Path; \=?f4*4|/
CString m_Number; Klzsr,
//}}AFX_DATA @f-0OX$*
// ClassWizard generated virtual function overrides o6P)IZ1
//{{AFX_VIRTUAL(CCaptureDlg) M@[{j
public: hug8Hhf_&
virtual BOOL PreTranslateMessage(MSG* pMsg); HWi0m/J
protected: SuMK=^>%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I@08F
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]6v6&YV
//}}AFX_VIRTUAL N5Eb.a9S
// Implementation 9?:SxI;v
protected: =P!SN]nFeP
HICON m_hIcon; wv|:-8V
// Generated message map functions l'fUa
//{{AFX_MSG(CCaptureDlg) S^]i
virtual BOOL OnInitDialog(); Vf`n>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); FZ
DC?
afx_msg void OnPaint(); g<-x"$(C&
afx_msg HCURSOR OnQueryDragIcon(); 'Q Ff 7A
virtual void OnCancel(); ,9^wKS!7$
afx_msg void OnAbout(); Y .Na9&-(
afx_msg void OnBrowse(); n{J<7I e"*
afx_msg void OnChange(); o}mD1q0yE
//}}AFX_MSG
"<SK=W
DECLARE_MESSAGE_MAP() H1N_
}; Xhe2 5
#endif MR=>DcR
zHw[`"[
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]xBQ7Xqf|
#include "stdafx.h" ^EdY:6NJ=A
#include "Capture.h" pP;GDW4
#include "CaptureDlg.h" D:sQHJ.y
#include <windowsx.h> v4kk4}lE
#pragma comment(lib,"hook.lib") r3<yG"J86
#ifdef _DEBUG *IJctYJaX
#define new DEBUG_NEW 7Q7z6p/\v
#undef THIS_FILE ZY-W~p1:G
static char THIS_FILE[] = __FILE__; ,~w)~fMb8
#endif x3xBl_t
#define IDM_SHELL WM_USER+1 s
de|t
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9]r6V
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ymT&[+V
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &ok2Xw
class CAboutDlg : public CDialog a*o#,T5A
{ }@_F( B
public: Ouc=4'$-
CAboutDlg(); |Tuk9d4]
// Dialog Data \b?z\bC56
//{{AFX_DATA(CAboutDlg) "yxIaTZu
enum { IDD = IDD_ABOUTBOX }; @jAuSBy
//}}AFX_DATA @x3x/gU
// ClassWizard generated virtual function overrides J)D/w[w
//{{AFX_VIRTUAL(CAboutDlg) pPem;i^~
protected: WBLfxr
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D|}
y{~
//}}AFX_VIRTUAL by,"Orpwq;
// Implementation 23BzD^2a
protected: f8'D{OP"G
//{{AFX_MSG(CAboutDlg) hVo]fD|W
//}}AFX_MSG ^$c+r%9k
DECLARE_MESSAGE_MAP() )"s <hR,
}; eL[BH8l
h lD0^8S
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @6w\q?.s
{ w?|gJ*B"
//{{AFX_DATA_INIT(CAboutDlg) WDNuR#J?
//}}AFX_DATA_INIT =t\HtAXn[
} @2cGx/1#
w0(A7L:L
void CAboutDlg::DoDataExchange(CDataExchange* pDX) xH#R_
{ 9IZ}}x
CDialog::DoDataExchange(pDX); UmZ#Cm
//{{AFX_DATA_MAP(CAboutDlg) ig3HPlC
//}}AFX_DATA_MAP Vi[* a
} PB*mD7"
/co^swz
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CKeT%3
//{{AFX_MSG_MAP(CAboutDlg) '+LC.l M
// No message handlers tYK
5?d
//}}AFX_MSG_MAP ZG+8kt!w
END_MESSAGE_MAP() }t#uSz^
FWcE\;%yVg
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >/k[6r5
: CDialog(CCaptureDlg::IDD, pParent) c,-3+b
{ o Mk6ZzZ,>
//{{AFX_DATA_INIT(CCaptureDlg) :t+XW`eQR:
m_bControl = FALSE; MgyV{`
m_bAlt = FALSE; ZE863M@.
m_bShift = FALSE; T+7-6y+ d
m_Path = _T("c:\\"); 4Ynv=G Qz
m_Number = _T("0 picture captured."); `3m7b!0k
nCount=0; \tH^w@j47
bRegistered=FALSE; b"n0Yk1
bTray=FALSE; H`|8x4
//}}AFX_DATA_INIT kBg,U 8|S
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pLi_)(#z_
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #e:cB' f
} ?_*X\En*3
77?/e^K\S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) xsn2Qn/P
{ {?yZdL:m)
CDialog::DoDataExchange(pDX); ZT;$aNy
//{{AFX_DATA_MAP(CCaptureDlg) p(o"K@I
DDX_Control(pDX, IDC_KEY, m_Key); ?o307r
DDX_Check(pDX, IDC_CONTROL, m_bControl); _{0'3tI7
DDX_Check(pDX, IDC_ALT, m_bAlt); 5jAiqJq~y:
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6V)P4ao
DDX_Text(pDX, IDC_PATH, m_Path); J3`a}LyDf
DDX_Text(pDX, IDC_NUMBER, m_Number); }wZ9#Ll
//}}AFX_DATA_MAP I(!i"b9
} n?'I&0>M
1 ~fD:
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y}Ji( q~
//{{AFX_MSG_MAP(CCaptureDlg) ahQdBoj
ON_WM_SYSCOMMAND() IJ >qs8
ON_WM_PAINT() nKpXRuFn\
ON_WM_QUERYDRAGICON() foO/Yc
ON_BN_CLICKED(ID_ABOUT, OnAbout) %i[G6+-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) x{y}pH "H
ON_BN_CLICKED(ID_CHANGE, OnChange) }Fs;sfH
//}}AFX_MSG_MAP *9Eep~ 6
END_MESSAGE_MAP()
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2H+!78
BOOL CCaptureDlg::OnInitDialog() &/o4R:i
{ fg"]4&`j-
CDialog::OnInitDialog(); +P YX.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mcbvB5U
ASSERT(IDM_ABOUTBOX < 0xF000); =GH>-*qp
CMenu* pSysMenu = GetSystemMenu(FALSE); SStaS<q'
if (pSysMenu != NULL) 2:b3+{\f
{ 2ZUI~:U Z
CString strAboutMenu; jD]Ci#|W
strAboutMenu.LoadString(IDS_ABOUTBOX); 3Wv-olv
if (!strAboutMenu.IsEmpty()) (S MnYh4
{ zM:&`6;e
pSysMenu->AppendMenu(MF_SEPARATOR); ]34fG3D|
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <!@*2/Q]J]
} I_ O8 9Sgn
} ^\o 3V<
SetIcon(m_hIcon, TRUE); // Set big icon {"f4oK{w
SetIcon(m_hIcon, FALSE); // Set small icon qaE>])
m_Key.SetCurSel(0); (@wgNA-P
RegisterHotkey(); EyU 5r$G
CMenu* pMenu=GetSystemMenu(FALSE); I'W`XN
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l;F\s&^
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m/M=.\]
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Gs`[\<;LI
return TRUE; // return TRUE unless you set the focus to a control ",&^ f
} d'p]F~a
Z9S5rPHEL
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) e'"2yA8dh"
{ N>a. dYXr
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ?xkw~3Yfi
{ X8m@xFW}
CAboutDlg dlgAbout; mV~aZM0'
dlgAbout.DoModal(); } J_"/bB
} 4th*=ku
else .5?e)o)
{ R*S9[fqC[
CDialog::OnSysCommand(nID, lParam); "INIP?
} 5B:%##Ug5
} *yX5g,52-|
VPC7Dh%.
void CCaptureDlg::OnPaint() TPE1}8p17
{ ?LxBH-o(
if (IsIconic()) %X|fp{C
{ kh7RQbNY<I
CPaintDC dc(this); // device context for painting ([g[\c,H
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kJP`C\4}f
// Center icon in client rectangle E}qW'
int cxIcon = GetSystemMetrics(SM_CXICON); d1[;~)
int cyIcon = GetSystemMetrics(SM_CYICON); 3rdrNc
CRect rect; C0O$iWs=
GetClientRect(&rect); )s-[d_g
int x = (rect.Width() - cxIcon + 1) / 2; Qk5pRoL_
int y = (rect.Height() - cyIcon + 1) / 2; 'sII/sq`(
// Draw the icon :}B=Bk/q
dc.DrawIcon(x, y, m_hIcon); +mu.W
r
} | XGj97#M
else W%&gvZre.
{ NUN~T (
CDialog::OnPaint(); 5I`_SOa!
} Yo-$Z-ud
} PH1jN?OEwZ
]?un'$%e
HCURSOR CCaptureDlg::OnQueryDragIcon() >IT19(J;A
{ UR{OrNg*
return (HCURSOR) m_hIcon; 6x*$/1'M3;
} >Tf <8r,
+hZ{/
void CCaptureDlg::OnCancel() ByU&fx2Z
{ Kb$6a'u7
if(bTray) L>3- z>u,
DeleteIcon(); ;#/Uo8
CDialog::OnCancel(); /l%+l@
} w/49O;r V
m=K46i+NE
void CCaptureDlg::OnAbout() vB?(|
{ v?@=WG
CAboutDlg dlg; Zws[C
dlg.DoModal(); ;t xW\iy%Z
} y$,j'B:;4m
=".sCV9"N
void CCaptureDlg::OnBrowse() Dug{)h_2
{ AqZ()p*z
CString str; )x<oRHx]
BROWSEINFO bi; )k~{p;Ke
char name[MAX_PATH]; n/ CP2A
ZeroMemory(&bi,sizeof(BROWSEINFO)); SHA6;y+U/~
bi.hwndOwner=GetSafeHwnd(); 6uu49x_^L4
bi.pszDisplayName=name; ^1\[hyZ!
bi.lpszTitle="Select folder"; hpBn_
bi.ulFlags=BIF_RETURNONLYFSDIRS; -)pVgf
LPITEMIDLIST idl=SHBrowseForFolder(&bi); G<m6Sf
if(idl==NULL) ~a ]R7X7
return; hfL8]d-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Qd"R@+i
str.ReleaseBuffer(); ^ZD0rp(l
m_Path=str; 8mnzxtk
if(str.GetAt(str.GetLength()-1)!='\\') 9O{b8=\}
m_Path+="\\"; V9\y*6#Y,
UpdateData(FALSE); D/`b~Yl
} P3_&(
@-% .+
void CCaptureDlg::SaveBmp() |h 3`z
{ :c3'U_H^
CDC dc; p5V.O20
dc.CreateDC("DISPLAY",NULL,NULL,NULL); [+3~wpU(p
CBitmap bm; 3d;w\#?L;
int Width=GetSystemMetrics(SM_CXSCREEN); /4Sul*{hc
int Height=GetSystemMetrics(SM_CYSCREEN); 08W^
bm.CreateCompatibleBitmap(&dc,Width,Height); 5uAUi=XA>S
CDC tdc; ^@-qnU lH
tdc.CreateCompatibleDC(&dc); 1
F+$\fLr
CBitmap*pOld=tdc.SelectObject(&bm); aUyJi
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #W2#'J:l
tdc.SelectObject(pOld); =rzhaU'A'
BITMAP btm; >U#j\2!Sg
bm.GetBitmap(&btm); +9NI=s6
DWORD size=btm.bmWidthBytes*btm.bmHeight; !4"<:tSO
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 52v@zDY
BITMAPINFOHEADER bih; A5 <T7~U
bih.biBitCount=btm.bmBitsPixel; nK>D& S_!
bih.biClrImportant=0; s g6e%
5
bih.biClrUsed=0; o#frNT}
bih.biCompression=0; omZ
bn
bih.biHeight=btm.bmHeight; Uv|^k8(
bih.biPlanes=1; E>L_$J -A-
bih.biSize=sizeof(BITMAPINFOHEADER); pcO{%]?p
bih.biSizeImage=size; MngfXm
bih.biWidth=btm.bmWidth; r.10b]b
bih.biXPelsPerMeter=0; [W--%=Ou
bih.biYPelsPerMeter=0; w@ $_2t
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x)prI6YMv\
static int filecount=0; yoVN|5
CString name; 'U{6LSaCb
name.Format("pict%04d.bmp",filecount++); `\Hs{t]
name=m_Path+name; x-Fl|kwX.5
BITMAPFILEHEADER bfh; QV*W#K\7q
bfh.bfReserved1=bfh.bfReserved2=0; *OR(8;
bfh.bfType=((WORD)('M'<< 8)|'B'); e=4k|8 G
bfh.bfSize=54+size; MtXd}/
bfh.bfOffBits=54; 39Zs
CFile bf; />[~2d
kb
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BDc "0XH
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); c
6$n:
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); kOLS<>.
bf.WriteHuge(lpData,size); qp`G5bw
bf.Close(); .9u,54t
nCount++; Sp~gY]:
} 2\L}Ka|v
GlobalFreePtr(lpData); hZDv5]V:0
if(nCount==1) O/{W:hJjd
m_Number.Format("%d picture captured.",nCount); ~\~XD+jy"
else G{{Or
m_Number.Format("%d pictures captured.",nCount); pNzpT!}H>
UpdateData(FALSE); Nbm=;FHB`
} c[E>2P2-_
MnT+p[.
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) jY8u1z
{ h|
]BA}D
if(pMsg -> message == WM_KEYDOWN) +{/*P5
{ SPY4l*kX
if(pMsg -> wParam == VK_ESCAPE) f')3~)"
return TRUE; iT"H%{+~
if(pMsg -> wParam == VK_RETURN) @V5'+^O
return TRUE; '<KzWxuC
} K)n0?Q_>
return CDialog::PreTranslateMessage(pMsg); pgU4>tyD
} 9KLhAYaq
}dSxrT
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bcy(
?(
{ j,CMcP7A -
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Mb[4G>-v=
SaveBmp(); PdD|3B&
return FALSE; ^"\.,Y
} H=k`7YN
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $[-{Mm
CMenu pop; C%+>uzVIw
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `Ao;xOJ
CMenu*pMenu=pop.GetSubMenu(0); "yV)&4)
pMenu->SetDefaultItem(ID_EXITICON); $N`uM
CPoint pt; ?FRQ!R
GetCursorPos(&pt); fl18x;^I
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R@H}n3,
if(id==ID_EXITICON) BlvNBB1^
DeleteIcon(); !WReThq
else if(id==ID_EXIT) ^Wz3 q-^
OnCancel(); [j`-R
0Np
return FALSE; _ Oe|ZQ
} gDJ@s
LRESULT res= CDialog::WindowProc(message, wParam, lParam); p; ZEz<M
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -?Aa RwZ,
AddIcon(); *cn#W]AE
return res; 7OOod1
} tHo0q<.oX
5`3f"(ay/
void CCaptureDlg::AddIcon() .5m^)hi
{ ^. i;,
NOTIFYICONDATA data; MB,P#7|
data.cbSize=sizeof(NOTIFYICONDATA); f3]u-e'b
CString tip; PX1Scvi
tip.LoadString(IDS_ICONTIP); dLek4q
`l
data.hIcon=GetIcon(0); 6uH1dsD
data.hWnd=GetSafeHwnd(); 7J%v""\1!
strcpy(data.szTip,tip); 8E!I9z
data.uCallbackMessage=IDM_SHELL; FE/2.!]&o
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8Bnw//_pT
data.uID=98; ^D0BGC&&
Shell_NotifyIcon(NIM_ADD,&data); "@[xo7T
ShowWindow(SW_HIDE); .W+ F<]r
bTray=TRUE; WPM<Qv L
} XU#nqvS` .
^(0tNX/XD
void CCaptureDlg::DeleteIcon() OWK)4[HY(
{ Z0 e+CEzq
NOTIFYICONDATA data; HG%H@uK
data.cbSize=sizeof(NOTIFYICONDATA); IJn r^S8
data.hWnd=GetSafeHwnd(); J}.y+b>8\
data.uID=98; fV.43E
Shell_NotifyIcon(NIM_DELETE,&data); 6)eU &5z1?
ShowWindow(SW_SHOW); }PY?
ZG
SetForegroundWindow(); aUy=D:\
ShowWindow(SW_SHOWNORMAL); rS
4'@a
bTray=FALSE;
ka&-tGg
} uXNf)?MpA
VM3H&$d(h
void CCaptureDlg::OnChange() NOa.K)^k
{ oLn| UWe_
RegisterHotkey(); | We @p
} 'ga1SbA]
*X;g
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BOOL CCaptureDlg::RegisterHotkey() nWK"i\2#G
{ FZ^byIS[
UpdateData(); ?mt$c6-
UCHAR mask=0; Ffm Q$>S
UCHAR key=0; | ~G;M*q
if(m_bControl) LE Y Y{G?
mask|=4; j$]t`6gG
if(m_bAlt) NCvwg
mask|=2; Ac.z6]p
if(m_bShift) EVj48
mask|=1; uBks#Y*3$
key=Key_Table[m_Key.GetCurSel()]; ^tuJM:
if(bRegistered){ ZH%[wQ~4
DeleteHotkey(GetSafeHwnd(),cKey,cMask); V]PTAhc
bRegistered=FALSE; $XI5fa4Tt
} pKMf#)qm
cMask=mask; 7@vcQv
kC
cKey=key; *k'9 %'<
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j86s[Dty
return bRegistered; @/JGC%!
} $}k"wI[
AX1'.
四、小结 7Hpsmfm
){>;eky
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。