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:
N=I5MQG
hChM hc 一、实现方法
[ z$J 3al5Vu2: 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
E"G._<3J8 Y" l!3^ #pragma data_seg("shareddata")
;?:,L HHOOK hHook =NULL; //钩子句柄
d'3'{C|kk UINT nHookCount =0; //挂接的程序数目
9q8
rf\& static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
h,p&/oU4U static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
" c static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
mmjB1L static int KeyCount =0;
c//W#V2Q static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
mMjVbeh[ #pragma data_seg()
PRah?|*0s ;q^YDZ' 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
G/ ^|oJ/G vCmh3TQ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
x)U; ~Igo
8ykl BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=& lYv cKey,UCHAR cMask)
2mT+@G {
~w*ojI BOOL bAdded=FALSE;
``z="oD for(int index=0;index<MAX_KEY;index++){
0,3 ':Df if(hCallWnd[index]==0){
dk]ro~ [ hCallWnd[index]=hWnd;
Lul?@>T HotKey[index]=cKey;
VN".NEL HotKeyMask[index]=cMask;
^}[
N4 bAdded=TRUE;
jXDo!a|4y KeyCount++;
{vH8X(m break;
iGlZFA }
Z)&HqqT3p }
e^an` </{ return bAdded;
r 1a{Y8? }
j,-7J*A~ //删除热键
F>Oh)VL,Ev BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~VGK#'X: {
Cwh;+3?C| BOOL bRemoved=FALSE;
[*<&]^ for(int index=0;index<MAX_KEY;index++){
VA%i_P, if(hCallWnd[index]==hWnd){
0q;] ;m if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
7U7 i2 4 hCallWnd[index]=NULL;
t8+93,*B HotKey[index]=0;
E,$uNw '] HotKeyMask[index]=0;
SYwNx">Bq bRemoved=TRUE;
g !8lW KeyCount--;
yLX#:
nm break;
.WPqK>79| }
Bx)&MYY}[[ }
4%7*tVG }
4>HGwk@+8 return bRemoved;
.0ZvCv:> }
=>J#_Pprn [P,nW/H {ULnQ6@ DLL中的钩子函数如下:
Fo=6A[J ]rm=F]W/n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
f$'D2o, O {
]]ZBG<# BOOL bProcessed=FALSE;
%G&v@R if(HC_ACTION==nCode)
c 1GP3 {
t*#&y:RG if((lParam&0xc0000000)==0xc0000000){// 有键松开
=R"tnjR switch(wParam)
rY= #^S {
}{y$$X<:
case VK_MENU:
`y#C%9# MaskBits&=~ALTBIT;
4\3t5n break;
2Qj)@&zKe# case VK_CONTROL:
PsnU5f)` MaskBits&=~CTRLBIT;
~-%A@Lt break;
:\OvVS/ case VK_SHIFT:
Y5CE#& MaskBits&=~SHIFTBIT;
J;`~
!g break;
H/&Q,9sU21 default: //judge the key and send message
?OyW|jL break;
QR'g*Bro }
bYc qscW for(int index=0;index<MAX_KEY;index++){
bg}77Y'^ if(hCallWnd[index]==NULL)
(^9M9+L[i continue;
m5X=P5U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$H} Mn"G {
zOdKB2_J7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Rp*t"HSaAW bProcessed=TRUE;
PEIr-qs%D }
%#a%Luq }
!.$P`wKr }
auW]rwY else if((lParam&0xc000ffff)==1){ //有键按下
>}*jsqaVU switch(wParam)
nj`qV {
s=
fKAxH case VK_MENU:
E | MaskBits|=ALTBIT;
*XOKH+_u break;
ie5ijkxZ( case VK_CONTROL:
;i:wY& MaskBits|=CTRLBIT;
vP?S0>gh break;
YO0x68 case VK_SHIFT:
Ue:T3jp3% MaskBits|=SHIFTBIT;
)`7+o9& break;
eb@Lh! default: //judge the key and send message
z{L;)U B^ break;
zEfD{I }
_ n4ma for(int index=0;index<MAX_KEY;index++){
F@bCm+z- if(hCallWnd[index]==NULL)
K<JP9t6Qd continue;
,{*fOpn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QvN
<uxm {
KB*=a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7=A9E]: bProcessed=TRUE;
{Y%=/ba W }
F|`B2Gr }
[#'_@zZz }
Qm x~_ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
^3o8F for(int index=0;index<MAX_KEY;index++){
[F[<2{FQF if(hCallWnd[index]==NULL)
}zxh:"#K continue;
5)NBM7h if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"mDrJTWa SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
t~K!["g //lParam的意义可看MSDN中WM_KEYDOWN部分
H)aC'M^ }
-xIhN?r) }
B^~Bv!tHWr }
]u ~Fn2 return CallNextHookEx( hHook, nCode, wParam, lParam );
G0Tc}_o<Y }
0a6z"K} -f|^}j? 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:
+u:OAsR ^GaPpm BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
#n)W BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
DLVs>?Y gs8@b5 RSb 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:
'=G
Ce%A p<fgUVR LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
:fKz^@mY4 {
-JhjTA if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
eEGcio}_I9 {
+Z~!n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
_JIUds5 SaveBmp();
=,8Eo"~\ return FALSE;
(Cd{#j< }
!Fg4Au …… //其它处理及默认处理
xXxh3 k\ }
nC.2./OwMf Cm<j*Cnl
{%~4RZA 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。
[x p,& mS~ ]I$ 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。
:8-gm"awL5 rbuL@=S@* 二、编程步骤
ZWhmO=b! qM!f 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";
T\
}v$A03 LSu^#B 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
hB}h-i(u !+DJhw&c, 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;
i|]Va44 =Pb5b6Y@6 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;
5-WRv; [aM' 5、 添加代码,编译运行程序。
3AQ>>) T~ C| L^Ds0 三、程序代码
$7DcQ b9 $n#Bi.A
j ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
%::deV7 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
dbuJ~?D, #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6+B{4OY #if _MSC_VER > 1000
'tu@`7* #pragma once
/sT
^lf= #endif // _MSC_VER > 1000
cI%"Ynq"3 #ifndef __AFXWIN_H__
Q6!v3P/h #error include 'stdafx.h' before including this file for PCH
^*xHy` #endif
M |({
4C #include "resource.h" // main symbols
[&pW&>p3 class CHookApp : public CWinApp
9ze| s^ {
oS#'u1k public:
^L-w(r62< CHookApp();
MYw8wwX0kJ // Overrides
z'oiyXEE3 // ClassWizard generated virtual function overrides
){ //{{AFX_VIRTUAL(CHookApp)
}uI7\\S public:
#3Ej0"A@-B virtual BOOL InitInstance();
!H1tBg]5 virtual int ExitInstance();
rx6-~0!eI= //}}AFX_VIRTUAL
E R]sDV //{{AFX_MSG(CHookApp)
BF@5&>E // NOTE - the ClassWizard will add and remove member functions here.
f7Df %&d // DO NOT EDIT what you see in these blocks of generated code !
7{An@hNh //}}AFX_MSG
LZc$:<J<6 DECLARE_MESSAGE_MAP()
lTr*'fX };
M,t*nG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
C3\E.u? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
% nmY:}um BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[l':G ] BOOL InitHotkey();
y5/'!L)g BOOL UnInit();
`/w\2n #endif
R{)
Q1~H=q hY=w|b=Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Rj}o4s2x #include "stdafx.h"
4g7ja #include "hook.h"
ran^te^Ks( #include <windowsx.h>
WfRfx#MMt #ifdef _DEBUG
S~k*r{?H}) #define new DEBUG_NEW
6hM]% #undef THIS_FILE
sp=OT-Pfp static char THIS_FILE[] = __FILE__;
!0ce kSesr #endif
Y8%0;!T #define MAX_KEY 100
HUJ|-)"dw #define CTRLBIT 0x04
UK6xkra?# #define ALTBIT 0x02
{ eEC:[ #define SHIFTBIT 0x01
Oz&+{ c #pragma data_seg("shareddata")
p"[O#*p HHOOK hHook =NULL;
kYxl1nv UINT nHookCount =0;
rps(Jos_~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
yOWOU`y? static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
)_77>f% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
WgA`kT static int KeyCount =0;
^Ue0mC7m static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
H\fcY p6 #pragma data_seg()
Sk/#J!T8{ HINSTANCE hins;
(S
k#x void VerifyWindow();
]^:hyOK BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Re*|$r# //{{AFX_MSG_MAP(CHookApp)
,\o<y|+`S // NOTE - the ClassWizard will add and remove mapping macros here.
n$XdSh/ // DO NOT EDIT what you see in these blocks of generated code!
y !<'rg //}}AFX_MSG_MAP
.!(,$'(@= END_MESSAGE_MAP()
Z&FkLww x"
'KW
( CHookApp::CHookApp()
[IX*sr {
wfxOx$]zK // TODO: add construction code here,
4l&"]9D // Place all significant initialization in InitInstance
gEv-> pc }
=n-z;/NL WY+(]Wkao CHookApp theApp;
LY-lTr@A^
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%5JW<9 {
9<|m4 BOOL bProcessed=FALSE;
U_}7d"<| ? if(HC_ACTION==nCode)
B(j02<- {
8F zHNG if((lParam&0xc0000000)==0xc0000000){// Key up
~->Hlxze'K switch(wParam)
_i3i HR? {
,0!uem}1i case VK_MENU:
l80bHp= MaskBits&=~ALTBIT;
LBiowd[ break;
m|pTn#*` case VK_CONTROL:
YC]PN5[1! MaskBits&=~CTRLBIT;
mEoA#U break;
b'velj3A case VK_SHIFT:
RT%x&j MaskBits&=~SHIFTBIT;
V:
^JC>6 break;
aje^Z=] default: //judge the key and send message
;rd6ko break;
\bhOPK>w }
9~@<-6jE3b for(int index=0;index<MAX_KEY;index++){
J &!B|TS if(hCallWnd[index]==NULL)
S|"Fgoj r continue;
fNkuX-om if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(/"thv5vT{ {
Bvz62? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Wk@
eV\H71 bProcessed=TRUE;
q0&Wk"X%rr }
<rNtY , }
ht?CHUu }
I-xwJi9?, else if((lParam&0xc000ffff)==1){ //Key down
: *ERRSL) switch(wParam)
D"L|"qJ {
cV-i*L4X case VK_MENU:
P7z:3o. MaskBits|=ALTBIT;
~32Pjk~ break;
6wPeb~{ case VK_CONTROL:
FbveI4 MaskBits|=CTRLBIT;
BBcj=]"_ break;
'/k^C9~m
r case VK_SHIFT:
Bg-VCJI< MaskBits|=SHIFTBIT;
#c-b}.R break;
D%-{q>F!gf default: //judge the key and send message
JwZ?hc break;
D9~}5 }
OCCEL9d for(int index=0;index<MAX_KEY;index++)
EYG"49
c {
TMK'(6dH if(hCallWnd[index]==NULL)
yI8 SQ$w0y continue;
=f>HiF if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B={/nC}G~ {
kl"
]Nw'C SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-Q#o)o
bProcessed=TRUE;
HOfF"QAR$ }
qNpu}\L }
N[pZIH5ho= }
5.wiTy if(!bProcessed){
lr WLN for(int index=0;index<MAX_KEY;index++){
34SA~5 if(hCallWnd[index]==NULL)
[g#s&bF continue;
sxo;/~.p if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+ 3h`UF SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
"%VbI P }
V]rhVMA }
;1v=||V }
hyfR9~ return CallNextHookEx( hHook, nCode, wParam, lParam );
wxj>W[V }
cf)J ) iNQ0p:<k BOOL InitHotkey()
22>;vM." {
m%pBXXfGYj if(hHook!=NULL){
3L>d!qD nHookCount++;
Ox^:)ii return TRUE;
3YW=||;|Yg }
ym\(PCa5` else
(3VGaUlx hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
[EgW/\35 if(hHook!=NULL)
g5y;?fqJ nHookCount++;
JkU1daTe return (hHook!=NULL);
r'p =`2= }
7:TO\0]2n BOOL UnInit()
B oqJ
{
bj}=8k0 if(nHookCount>1){
Vv8_\^g] nHookCount--;
/PXioiGcs return TRUE;
Ea4_Qmn }
If;R?j0;Q BOOL unhooked = UnhookWindowsHookEx(hHook);
4O(@'#LLz if(unhooked==TRUE){
r,4lqar;E nHookCount=0;
OEnDsIhq hHook=NULL;
W5.Va. }
L]I3P|y_ return unhooked;
cD2+hp|9 }
&Yf",KcL*I n_P3\Y| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
qaG# ; {
%H& ].47 BOOL bAdded=FALSE;
V@% for(int index=0;index<MAX_KEY;index++){
\gItZ}+c4} if(hCallWnd[index]==0){
i.y=8GxY hCallWnd[index]=hWnd;
.%'Z~|K4 HotKey[index]=cKey;
4PWAGuN^ HotKeyMask[index]=cMask;
7)^:8I( bAdded=TRUE;
i)8N(HN KeyCount++;
#f*g]p{ break;
>&WhQhZ3kg }
,."b3wR[w }
F\:(*1C return bAdded;
,3HcCuT }
', {7%G9
oq$w4D0Z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(e9fm|n!)| {
+?[BU<X6u BOOL bRemoved=FALSE;
f8'MP9Lv for(int index=0;index<MAX_KEY;index++){
.et ^4V3 if(hCallWnd[index]==hWnd){
ka/XK[/' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
02\JzBU hCallWnd[index]=NULL;
m!O;>D HotKey[index]=0;
Yp1bH+/u HotKeyMask[index]=0;
gcf6\f}\< bRemoved=TRUE;
RV+E^pkp$ KeyCount--;
u1Ek y/e- break;
.<#ATFmY }
7LCp7$Cp }
]6&$|2H?Ni }
mI7~c;~ return bRemoved;
[A9JshMo }
{q3:Z{#>7 ~e">_;k6 void VerifyWindow()
+th%enRB {
bA@P}M)X for(int i=0;i<MAX_KEY;i++){
(UYF%MA}" if(hCallWnd
!=NULL){ s+Q;pRZW{
if(!IsWindow(hCallWnd)){ " xR[mJ@U
hCallWnd=NULL; 1ibnx2^YB
HotKey=0; ECcZz.
HotKeyMask=0; l&W;b6L
KeyCount--; y3eHF^K+$
} >MG(qi
} 2(M6(xH>
} s-*._;
} 4woO;Gm
l!
v!hUb+
BOOL CHookApp::InitInstance() S~NM\[S
{ }]+xFj9[>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); yGj.)$1},@
hins=AfxGetInstanceHandle(); ;o-yQmdh
InitHotkey(); W^\d^)
return CWinApp::InitInstance(); `t(D!
} +fNvNbtA
'dJ/RJ~
int CHookApp::ExitInstance() G7@O`N8'
{ &:5\"b
VerifyWindow(); fuX'~$b.fA
UnInit(); bZ 443SG
return CWinApp::ExitInstance(); T$+-IAE
} _S@aGw
ZA(T
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :I1_X
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \or G63T:
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .*YD&(
#if _MSC_VER > 1000 ?okx<'"[
#pragma once a9U_ug58
#endif // _MSC_VER > 1000 )92r{%N
o[1ylzk}+
class CCaptureDlg : public CDialog 8K"+,s(%R
{ bKDA!R2
// Construction ][;G=oCT
public: Kw5Lhc1V
BOOL bTray; #1.YKo
BOOL bRegistered; )G1P^WV4
BOOL RegisterHotkey(); n_u1&a'
UCHAR cKey; 6oD\-H
UCHAR cMask; k`{7}zxS
void DeleteIcon(); ]; Wx
void AddIcon(); o<i,*y88
UINT nCount; fc_2D|
void SaveBmp(); z=7|{ G
CCaptureDlg(CWnd* pParent = NULL); // standard constructor fJAnKUF)
// Dialog Data \qh*E#j
//{{AFX_DATA(CCaptureDlg) ^aZAw%K
enum { IDD = IDD_CAPTURE_DIALOG }; >~nF=
CComboBox m_Key; 58tVx'1y
BOOL m_bControl; t*XN_=E$f
BOOL m_bAlt; w
ej[+y-
BOOL m_bShift; %A/_5;PZ/
CString m_Path; 1|r,dE2k9
CString m_Number; sTRJ:fR
//}}AFX_DATA O) atNE
// ClassWizard generated virtual function overrides ;]sYf
//{{AFX_VIRTUAL(CCaptureDlg) I=DxRgt
public: 7q=G&e7
virtual BOOL PreTranslateMessage(MSG* pMsg); @A<PkpNL
protected: tw=oH9c80
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lfZ04M{2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Zw1U@5}A
//}}AFX_VIRTUAL ^P'{U26
// Implementation 'x"08v$
protected: !h[VUg_8
HICON m_hIcon; &opd2
// Generated message map functions n(seNp%_
//{{AFX_MSG(CCaptureDlg) c]-*P7W
virtual BOOL OnInitDialog(); )!BsF'uVQ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); SQ*k =4*r
afx_msg void OnPaint(); 4LH[4Yj?`
afx_msg HCURSOR OnQueryDragIcon(); e4>"92hX
virtual void OnCancel(); *hLQ
afx_msg void OnAbout(); nC1zzFFJ
afx_msg void OnBrowse(); Y?J"wdWJNB
afx_msg void OnChange(); /4\wn?f
//}}AFX_MSG 7R4z}2F2
DECLARE_MESSAGE_MAP() 7nq3S
}; 4QOEw-~w&s
#endif An*~-u9m
`Z"Q^
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~@ jY[_
#include "stdafx.h" \b=Pj!^gwb
#include "Capture.h" $Xm6N@
#include "CaptureDlg.h" q$(5Vd:
#include <windowsx.h> %V9ZyQg%*
#pragma comment(lib,"hook.lib") j^tW
Iz
#ifdef _DEBUG gKz(=
#define new DEBUG_NEW $d S@y+
#undef THIS_FILE zq+o+o>xo
static char THIS_FILE[] = __FILE__; u9+kLepOT
#endif uDw.|B2ui
#define IDM_SHELL WM_USER+1 yXI >I
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'H8(=9O1d
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ",aTWQgN
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; tVrY3)c
class CAboutDlg : public CDialog 'H5M|c$s
{ WY^W.1X
public: (;Y8pKl1e
CAboutDlg(); ;5-r_D;9
// Dialog Data "tFxhKf
//{{AFX_DATA(CAboutDlg) P 3MhU;
enum { IDD = IDD_ABOUTBOX }; ~lNsa".c
//}}AFX_DATA 0:0NXVYs&
// ClassWizard generated virtual function overrides ui q^|5Z
//{{AFX_VIRTUAL(CAboutDlg) qyC=(v
protected: 'r1LSht'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !`1'2BC
//}}AFX_VIRTUAL 8r"+bhGx~
// Implementation e:H26 SW
protected: bXUy9-L
//{{AFX_MSG(CAboutDlg) pG1WXbqW
//}}AFX_MSG m,C1J%{^
DECLARE_MESSAGE_MAP() lif&@of
}; FR2=
las"z
\^I>Q_LU
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q9w~A-Oh`1
{ RrUBpqA
//{{AFX_DATA_INIT(CAboutDlg) bVP"(H]
//}}AFX_DATA_INIT
rc&%m
} _@S`5;4x
xGTP;NT_H
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ljl^ GFo
{ @36u8pE
CDialog::DoDataExchange(pDX); z[`@}}Q
//{{AFX_DATA_MAP(CAboutDlg) Zo1,1O
//}}AFX_DATA_MAP ;XM{o:1Y[
} F}Vr:~
2'=T[<nNB
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ctE\ q
//{{AFX_MSG_MAP(CAboutDlg) uqz]J$
// No message handlers SBA?^T
//}}AFX_MSG_MAP g&/T*L
END_MESSAGE_MAP() iq(
)8nxi
`al<(FwGE
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) rZ8`sIWQt
: CDialog(CCaptureDlg::IDD, pParent) *m?/O}R
{ bfo["
//{{AFX_DATA_INIT(CCaptureDlg) lHgs;>U$
m_bControl = FALSE; Xpzfm7CB/
m_bAlt = FALSE; cGjPxG;
m_bShift = FALSE; \&U>LwZd?
m_Path = _T("c:\\"); Ft}@1w5
m_Number = _T("0 picture captured."); 9tF9T\jW
nCount=0; H"A7Zo
bRegistered=FALSE; %|s+jeUDn|
bTray=FALSE; (vT+IZEI
//}}AFX_DATA_INIT
%iV^S!e
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 boDt`2=
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %^RN#_ro(3
} ]_N|L|]M
ER,1(1]N
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vWAL^?HUP
{ d!eYqM7-G
CDialog::DoDataExchange(pDX); "DYJ21Ut4
//{{AFX_DATA_MAP(CCaptureDlg) U&O:
_>~
DDX_Control(pDX, IDC_KEY, m_Key); N-lkYL-%\j
DDX_Check(pDX, IDC_CONTROL, m_bControl); sr8cYLm5R
DDX_Check(pDX, IDC_ALT, m_bAlt); ]U"94S U:)
DDX_Check(pDX, IDC_SHIFT, m_bShift); 8OgLn?"P
DDX_Text(pDX, IDC_PATH, m_Path); H;RwO@v
DDX_Text(pDX, IDC_NUMBER, m_Number); N7e"@Ic
//}}AFX_DATA_MAP 03C0L&
} ]+X@
7
x.-+[l[1
!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) / m=HG^!
//{{AFX_MSG_MAP(CCaptureDlg) -'6Dg
ON_WM_SYSCOMMAND() yPq'( PV
ON_WM_PAINT() AK@9?_D
ON_WM_QUERYDRAGICON() /Rl6g9}
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3Z1CWzq(
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
O({2ivX
ON_BN_CLICKED(ID_CHANGE, OnChange) ` V##Y
//}}AFX_MSG_MAP .V,@k7U,V
END_MESSAGE_MAP() FSND>\>
ob8qe,_'
BOOL CCaptureDlg::OnInitDialog() !KUi\yQ1
{ #\=F O>
CDialog::OnInitDialog(); % >=!p
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B
{>7-0
ASSERT(IDM_ABOUTBOX < 0xF000); ZHa"isl$e
CMenu* pSysMenu = GetSystemMenu(FALSE); wb0L.'jyR)
if (pSysMenu != NULL) _*f`iu:`
{ (!:,+*YY
CString strAboutMenu; =i[\-
strAboutMenu.LoadString(IDS_ABOUTBOX); q.;u?,|E/
if (!strAboutMenu.IsEmpty()) 79;<_(Y
{ %^jMj2
pSysMenu->AppendMenu(MF_SEPARATOR);
PUUwv_
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B6={&7U2
} 'dn]rV0(C
} !z>6Uf!{
SetIcon(m_hIcon, TRUE); // Set big icon 2'w?\{}D
SetIcon(m_hIcon, FALSE); // Set small icon \.-bZ$
m_Key.SetCurSel(0); gw!vlwC&T
RegisterHotkey(); w(L4A0K[
CMenu* pMenu=GetSystemMenu(FALSE); x7Yu I
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V-BiF>+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m^zUmrj[
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6e|*E`I
return TRUE; // return TRUE unless you set the focus to a control HAa;hb
} *}*FX+px)
Fe4(4
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) p>huRp^w
{ h'{ C[d
if ((nID & 0xFFF0) == IDM_ABOUTBOX) x<ZJb
{ Te[n,\Nb
CAboutDlg dlgAbout; XuFYYx~ ^3
dlgAbout.DoModal(); )P
sY($ &
} Bx<
<~[Ws}
else lNYt`xp
{ %#kg#@z_`e
CDialog::OnSysCommand(nID, lParam); %lGl,me H
} 9w7n1k.
} r97pOs#5:
2fL;-\!y(
void CCaptureDlg::OnPaint() 'DCTc&J['
{ %iQD /iT5
if (IsIconic()) 8)_XJ"9)G
{ JxM]9<a=4
CPaintDC dc(this); // device context for painting MDn ua
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =c\>(2D
// Center icon in client rectangle (,0(
int cxIcon = GetSystemMetrics(SM_CXICON); GBPo8L"9
int cyIcon = GetSystemMetrics(SM_CYICON); rD3v$B
CRect rect; <eWf<
GetClientRect(&rect); ^'PWI{ O
int x = (rect.Width() - cxIcon + 1) / 2; vbZ}Z3f_
int y = (rect.Height() - cyIcon + 1) / 2; b0Ps5G\ u
// Draw the icon W_"sM0
w
dc.DrawIcon(x, y, m_hIcon); ,s"^kFl
} N2;B-U F
7
else
f6&iy$@
{ 0Qf,@^zL*
CDialog::OnPaint(); },{$*f[
} [M=7M}f;
} QTk}h_<u
!$gR{XH$]
HCURSOR CCaptureDlg::OnQueryDragIcon() )"7iJb<E
{ AP 2_MV4W
return (HCURSOR) m_hIcon; Pd_U7&w,5
} !Dn,^
-lY6|79bF
void CCaptureDlg::OnCancel() <Zmg#
{ 1~NT.tY
if(bTray) qm/22:&v5
DeleteIcon(); V_ .5b&@
CDialog::OnCancel(); Q+{xZ'o"Z
} A P?R"%
&w_j/nW^'
void CCaptureDlg::OnAbout() YJT&{jYi
{ ~:s>aQ`!
CAboutDlg dlg; iP ->S\
dlg.DoModal(); mn"G_I
} 8e1UmM[
0ypNUG}
void CCaptureDlg::OnBrowse() ymhtX6]
{ kTOzSiq
CString str; lZ]ZDb?P
BROWSEINFO bi; V^bwXr4f
char name[MAX_PATH]; I-]?"Q7Jz
ZeroMemory(&bi,sizeof(BROWSEINFO)); .ypL=~Rp
bi.hwndOwner=GetSafeHwnd(); $9_xGfx}
bi.pszDisplayName=name; $r@zs'N
bi.lpszTitle="Select folder"; E Nhl&J
bi.ulFlags=BIF_RETURNONLYFSDIRS; "jKY1*?
LPITEMIDLIST idl=SHBrowseForFolder(&bi); -b9\=U[
if(idl==NULL) @=}0`bE
return; l<58A7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [}E='m}u9+
str.ReleaseBuffer(); `EA\u]PwQ
m_Path=str; 61C7.EZZ;
if(str.GetAt(str.GetLength()-1)!='\\') Bu~]ey1
m_Path+="\\"; P~ >OS5^
UpdateData(FALSE); H)kwQRfu
} #wwH m3
P64PPbP
void CCaptureDlg::SaveBmp() _Xe>V0
{ un mJbY;t
CDC dc; O:;w3u7;u
dc.CreateDC("DISPLAY",NULL,NULL,NULL); c_$=-Khk
CBitmap bm; -P$PAg5"2
int Width=GetSystemMetrics(SM_CXSCREEN); %rL.|q9
int Height=GetSystemMetrics(SM_CYSCREEN); NX*Q F+
bm.CreateCompatibleBitmap(&dc,Width,Height); O`IQ(,yef
CDC tdc; ZB=
E}]v6
tdc.CreateCompatibleDC(&dc); [Kg+^N%+
CBitmap*pOld=tdc.SelectObject(&bm); %}SrL*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >
PRFWO
tdc.SelectObject(pOld); /=nJRC3.
BITMAP btm; 24 ' J
bm.GetBitmap(&btm); t6"%3#s
DWORD size=btm.bmWidthBytes*btm.bmHeight; _YhES-Ff
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?Jm^<
BITMAPINFOHEADER bih; v!~fs)cdE|
bih.biBitCount=btm.bmBitsPixel; !Iy_UfW
bih.biClrImportant=0; 'x#~'v*
bih.biClrUsed=0; f643#1
bih.biCompression=0; {I%cxQ#y
bih.biHeight=btm.bmHeight; ?=Z?6fw
bih.biPlanes=1; UmP/h@8
bih.biSize=sizeof(BITMAPINFOHEADER); @1roe
G
bih.biSizeImage=size; ,wb:dj-
bih.biWidth=btm.bmWidth; C2kPMB=Xo
bih.biXPelsPerMeter=0; G5BfNU
bih.biYPelsPerMeter=0; S6DKREO
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ko<:Z)PS
static int filecount=0; U)o-8OEZ9
CString name; O m|_{
name.Format("pict%04d.bmp",filecount++); I3L<[-ZE
name=m_Path+name; zFfr.g;L
BITMAPFILEHEADER bfh; 8b&/k8i:
bfh.bfReserved1=bfh.bfReserved2=0; _`j7clEz
bfh.bfType=((WORD)('M'<< 8)|'B'); BA:VPTZq
bfh.bfSize=54+size; e8a+2.!&\
bfh.bfOffBits=54; Hk3sI-XkA
CFile bf; Woym/[i
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ reu*53r]
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q~
w|#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0
1rK8jX
bf.WriteHuge(lpData,size); W' VslZG
bf.Close(); tCH!my_
nCount++; L
ca}J&x]^
} /hR&8 `\\
GlobalFreePtr(lpData); -=Q*Ml#I
if(nCount==1) ~!d\^Z^i
m_Number.Format("%d picture captured.",nCount); 9s
q
else )D7m,Wi+
m_Number.Format("%d pictures captured.",nCount); D%pF;XY
UpdateData(FALSE); `4J$Et%S
} K\Wkoi5
iOghb*aW
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p?OoC
{ Dw.J2>uj
if(pMsg -> message == WM_KEYDOWN) k1~&x$G
{ e#8Q L
if(pMsg -> wParam == VK_ESCAPE) H/
HMm{4
return TRUE; C ;W"wBz9
if(pMsg -> wParam == VK_RETURN) <)H9V-5aZ
return TRUE; ~qKY) "gG
} 0v?"tOT!
return CDialog::PreTranslateMessage(pMsg); %J?xRv!
} Q(?#'<.#
1.GQau~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O,f?YJ9S
{ `*R:gE=
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Ee! 4xg
SaveBmp(); {%H'z$|{
return FALSE; BX7kO0j
} D/&o&G96
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T.BW H2gRP
CMenu pop; zTSTEOP}%Y
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XNkn|q2
CMenu*pMenu=pop.GetSubMenu(0); UB@+ck
pMenu->SetDefaultItem(ID_EXITICON); pz*3N
CPoint pt; F^;ez/Gl
GetCursorPos(&pt); gR;i(81U
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r`d4e,(
if(id==ID_EXITICON) \ ~$#1D1f
DeleteIcon(); :4/3q|cn
else if(id==ID_EXIT) &j"?\f?
OnCancel(); g}cq K
return FALSE; oD.Cs'
} #q=Efn'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +a+Om73B2
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^hM4j{|&M
AddIcon(); dUZ
,m9u
return res; ;4|15S
} <\^8fn
}Zn}
void CCaptureDlg::AddIcon() aX'*pK/-
{ sDlO#
NOTIFYICONDATA data; S2&4g/
data.cbSize=sizeof(NOTIFYICONDATA); +=</&Tm
CString tip; pl?`8@dI
tip.LoadString(IDS_ICONTIP); ?CPahU
data.hIcon=GetIcon(0); bROLOf4S
data.hWnd=GetSafeHwnd(); 9W2Vo [(
strcpy(data.szTip,tip); on`3&0,.
data.uCallbackMessage=IDM_SHELL; 6LIJQ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; HIZe0%WPw
data.uID=98; Kn1a>fLaJ_
Shell_NotifyIcon(NIM_ADD,&data); E ~<JC"]
ShowWindow(SW_HIDE); ] (8[}CeL
bTray=TRUE; '5$b-x6 F
} >|UOz&
j A%u 5V
void CCaptureDlg::DeleteIcon() /*mI<[xb
{ BRiE&GzrF
NOTIFYICONDATA data; '~=SzO
data.cbSize=sizeof(NOTIFYICONDATA); /a4{?? #e
data.hWnd=GetSafeHwnd(); )+DmOsH
data.uID=98; 8{sGNCvU
Shell_NotifyIcon(NIM_DELETE,&data); x7[BK_SY
ShowWindow(SW_SHOW); 0\P1; ak%
SetForegroundWindow(); Ad_hKO
ShowWindow(SW_SHOWNORMAL); M8(t'jN
bTray=FALSE; 4H&+dRI"
} eng'X-x
+23xev
void CCaptureDlg::OnChange() U>N1Od4vTO
{ N<}5A%
RegisterHotkey(); wbl&
} t%=tik2|7
/gP+N2o+}
BOOL CCaptureDlg::RegisterHotkey() S<Xf>-8w
{ 4^:=xL
UpdateData(); "4{r6[dn
UCHAR mask=0; g}c~ :p
UCHAR key=0; aPL+=5 8r
if(m_bControl) KbeC"mi
mask|=4; Qvhl4-XjZa
if(m_bAlt) H/M@t\$Dc
mask|=2; 3.y vvPFEM
if(m_bShift) }qD\0+`qi
mask|=1; 5=ryDrx
key=Key_Table[m_Key.GetCurSel()]; 7qS)c}Q\
if(bRegistered){ Y}wyw8g/
DeleteHotkey(GetSafeHwnd(),cKey,cMask); G4"F+%.
bRegistered=FALSE; 5r^(P
} Cw&KVw*
cMask=mask; G"A#Q"
cKey=key; WH^%:4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a\*yZlXKs
return bRegistered; 5nx1i
} w``U=sfmV
>^3i|PB
四、小结 Qo|\-y-#
PCtzl)
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。