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:
_]>1(8_N
'RK"/ZhqE 一、实现方法
x.?5-3|d$ ,JV0ib, 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:
RU:Rt' e /JQ #A #pragma data_seg("shareddata")
%x$U(I} HHOOK hHook =NULL; //钩子句柄
#]@HsVXh7 UINT nHookCount =0; //挂接的程序数目
~-BF7f6C static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Yv;s3>r
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
lrT2*$ w3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
i/ilG3m> static int KeyCount =0;
WKEb
'^ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
dq[h:kYm #pragma data_seg()
FLqN3D=yQ f
V. c6 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。
!.]JiT'o 7z{wYCw 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:
-1g:3'%
P 8-#%l~dr BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
$RPW/Lyiq cKey,UCHAR cMask)
}~XWtWbd- {
V0\[|E;F BOOL bAdded=FALSE;
HgF;[rq3Q for(int index=0;index<MAX_KEY;index++){
)\fY1WD if(hCallWnd[index]==0){
f&^(f1WO hCallWnd[index]=hWnd;
pIJXP$v3 HotKey[index]=cKey;
4]y)YNQ( HotKeyMask[index]=cMask;
pE4a ~: bAdded=TRUE;
fGo4&( U KeyCount++;
/8cRPB. break;
nVb@sI{{k }
BX@Iq }
Wy}I"q[~So return bAdded;
I &t~o }
ut{T:kT //删除热键
I{`7 0 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Lx^ eaP5 {
T #\ BOOL bRemoved=FALSE;
'ZfgCu)St for(int index=0;index<MAX_KEY;index++){
Y`|+sND if(hCallWnd[index]==hWnd){
&],uD3:5O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
XIeLu"TSL hCallWnd[index]=NULL;
!'7fOP-J] HotKey[index]=0;
k_al*iM>H HotKeyMask[index]=0;
@;Ttdwg#J bRemoved=TRUE;
Ifj&S'(): KeyCount--;
P3$eomX' break;
n_8[bkbi }
tZrc4$D- }
K2x[ApS# }
?Ec9rM\ze return bRemoved;
hvd}l8 }
R?2sbK4Cz w2)Ro:G BT$p~XB DLL中的钩子函数如下:
`2~>$Tr lo1Ui`V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
z*y!Ml1 {
Y Y:BwW: BOOL bProcessed=FALSE;
;SR ESW if(HC_ACTION==nCode)
FqKJids- {
THA9OXP if((lParam&0xc0000000)==0xc0000000){// 有键松开
v\0 G`&^1 switch(wParam)
Q M,!-~t {
|.IH4
K case VK_MENU:
I$Nh|eM MaskBits&=~ALTBIT;
{Z.6\G&q break;
^
k^y|\UtZ case VK_CONTROL:
da{]B5p\ MaskBits&=~CTRLBIT;
TQ
Vk;&A break;
bQll;U^A case VK_SHIFT:
T:|/ux3 MaskBits&=~SHIFTBIT;
W+XWS,( break;
l{3B}_, default: //judge the key and send message
9N]Xa break;
e5h*GKF }
N!A20Bv for(int index=0;index<MAX_KEY;index++){
Ycm)PU [" if(hCallWnd[index]==NULL)
QaX.Av continue;
WKf<%
E$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
."K>h3(&V {
'Pz%c}hJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
]wQ!ZG?)
bProcessed=TRUE;
idmU.` }
~m%[d.
}e }
,N/@=As9$ }
E' 5*w6 else if((lParam&0xc000ffff)==1){ //有键按下
~PQ.l\C switch(wParam)
BT{;^Hp {
^-;S&= case VK_MENU:
;#B(L=/ MaskBits|=ALTBIT;
BEZ~<E&0H break;
Z1Qz
LvWs case VK_CONTROL:
;%|im? MaskBits|=CTRLBIT;
a"~o'W7 break;
!+xQ case VK_SHIFT:
Nk~}aj MaskBits|=SHIFTBIT;
V>$( N/1 break;
^df wWP default: //judge the key and send message
5'lVh/ break;
J )1 }
dzcF15H1 for(int index=0;index<MAX_KEY;index++){
;!yK~OBxt if(hCallWnd[index]==NULL)
2:+8]b 3i continue;
2 a<\4w' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
k(Yz2 {
xh6(~'$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
;[zZI~wh bProcessed=TRUE;
"%
i1zQo& }
<)cmI .J3 }
")boY/ P/w }
T5@t_D>8 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
cLp9|y0r for(int index=0;index<MAX_KEY;index++){
YC{7;=Pf if(hCallWnd[index]==NULL)
NFU=PS$ continue;
#.j:P# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X7aj/:fXe SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
M~sP|Ha"+ //lParam的意义可看MSDN中WM_KEYDOWN部分
6yaWxpW }
F7p`zf@O] }
(ds*$] }
/Wjf"dG} return CallNextHookEx( hHook, nCode, wParam, lParam );
-mZ{.\9 }
+w?1<Z ]sI{+$~:c 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:
{-IRX)m* zHj_q%A BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`O=LQ m` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&kOb#\11u U&tR1v' 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:
1 pzd V> eJ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
H%c{ }F {
k|^nrjStC if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Ks7kaX {
HPWjNwM //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
)&elr,b/y SaveBmp();
|B*`%7{+ return FALSE;
7W#9ki1 }
yIThzyS …… //其它处理及默认处理
(aH_K07 }
t#g6rh& w3IU'(|G T1b9Zqc)f 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。
ph1veD<ZZ 0 g(hY: 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。
whg?X&j\V tU7eW#"w 二、编程步骤
Ec]cCLB {z%%(,I 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";
\oGZM0j :U;ZBs3 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
m;LeaD}0 Hv>Hz*s_I 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;
t
UW'E VuW&CnZ 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;
WYE[H9x1? !$+J7\&7p 5、 添加代码,编译运行程序。
CLD*\)QD\ N1!|nS3w 三、程序代码
7<?v!vQ}- `}u~nu< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
sOW-GWSE< #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
$wVY)p9Q #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
lBTgI"n=eK #if _MSC_VER > 1000
B)"WG7W E #pragma once
*$_<|
g)9 #endif // _MSC_VER > 1000
aARm nV #ifndef __AFXWIN_H__
#,qikKjt2 #error include 'stdafx.h' before including this file for PCH
U07n7`2w #endif
^IM;D)X&: #include "resource.h" // main symbols
sM~|}|p class CHookApp : public CWinApp
4//Ww6W: {
A\.M/)Qo public:
s\Cl3 CHookApp();
:h3
Gk;u // Overrides
te'<xfG // ClassWizard generated virtual function overrides
+Mv0X%(N //{{AFX_VIRTUAL(CHookApp)
O`mW, public:
zYj8\iER virtual BOOL InitInstance();
B69 NL virtual int ExitInstance();
s6). ?oE //}}AFX_VIRTUAL
T.W/S0#j3 //{{AFX_MSG(CHookApp)
#,
vN // NOTE - the ClassWizard will add and remove member functions here.
F{f "xM // DO NOT EDIT what you see in these blocks of generated code !
)CXJRo`j0 //}}AFX_MSG
z/rN+ , DECLARE_MESSAGE_MAP()
o,Ew7~u };
sbNCviKP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
IEeh)aj[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
M6|Q~8$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
hlkf|H BOOL InitHotkey();
*+qXXCA BOOL UnInit();
haa[ob6T #endif
R`>E_SY OjeM#s#N! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
xb_35'$M #include "stdafx.h"
n&[U/`o #include "hook.h"
-\>Bphu,y #include <windowsx.h>
)X| uOg&| #ifdef _DEBUG
0V srAV0 #define new DEBUG_NEW
ybf`7KEP2A #undef THIS_FILE
/k}vm3 static char THIS_FILE[] = __FILE__;
<r3F*S= #endif
;U}lh~e11 #define MAX_KEY 100
UO<%|{W+ #define CTRLBIT 0x04
='OPU5(;O #define ALTBIT 0x02
T92k"fBY #define SHIFTBIT 0x01
"2 qp-'^[c #pragma data_seg("shareddata")
?exV:OKLb HHOOK hHook =NULL;
yZA}WTGe UINT nHookCount =0;
HK5\i@G+< static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
A*~zdZ p static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
M.!U;U<? static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
=?T'@C static int KeyCount =0;
)>$xbo")k static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
a{69JY5 #pragma data_seg()
9)T;.O HINSTANCE hins;
S1;#58 void VerifyWindow();
nY}Ep\g BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
%,-vmqr //{{AFX_MSG_MAP(CHookApp)
SH5GW3\h // NOTE - the ClassWizard will add and remove mapping macros here.
|ay W _5} // DO NOT EDIT what you see in these blocks of generated code!
Q6kkMLh //}}AFX_MSG_MAP
07# ~cVI END_MESSAGE_MAP()
SAc}5. HDA!;&NRS CHookApp::CHookApp()
;VYL7Xu]( {
{&"rv<p // TODO: add construction code here,
ezCsbV;. [ // Place all significant initialization in InitInstance
z9YC9m)jK }
q9yY% avykg( CHookApp theApp;
z';p275 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
KE&Y~y8O\ {
#:w/vk BOOL bProcessed=FALSE;
%{5mkO&,2 if(HC_ACTION==nCode)
^zO%O653 {
I(bH.{1n7 if((lParam&0xc0000000)==0xc0000000){// Key up
$^y6>@~ switch(wParam)
H)G ^ Y1 {
@T|mHfQ8 case VK_MENU:
o-_0 MaskBits&=~ALTBIT;
[&j!g break;
Bk?3lwCT case VK_CONTROL:
/
\!hW-+]W MaskBits&=~CTRLBIT;
%=S~[&8C break;
<hkg~4EKc case VK_SHIFT:
RN]4 Is: MaskBits&=~SHIFTBIT;
mH}/QfUlq break;
G5 Y 8]N default: //judge the key and send message
(SfP3 break;
NELQo#kjZ }
pe Y( 4# for(int index=0;index<MAX_KEY;index++){
%XMrSlSOp if(hCallWnd[index]==NULL)
2d >kc2=* continue;
8tK 8|t5+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-z-58FLlO {
&-470Z%/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
E#URTt:&> bProcessed=TRUE;
MP-A^QT }
$C##S@ }
<bDjAVq }
'sn%+oN else if((lParam&0xc000ffff)==1){ //Key down
Hz`rw\\Xq switch(wParam)
jW}n6w5 {
qN1(mxa.? case VK_MENU:
\( LKLlam MaskBits|=ALTBIT;
p^Kp= z break;
cYFR.~p case VK_CONTROL:
8 *;G\$+ MaskBits|=CTRLBIT;
f\!*%xS; break;
? }|;ai case VK_SHIFT:
2^Tj7@ MaskBits|=SHIFTBIT;
?"$W=*P\o break;
zU:zzT}|TZ default: //judge the key and send message
4tz8^z[Kw break;
xAMj 16ZF }
i,NN" for(int index=0;index<MAX_KEY;index++)
;_R;P;< {
?D/r1%Z if(hCallWnd[index]==NULL)
X's-i! continue;
z%Ywjfn' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z~F% K~( {
m0t5oO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7uFM)b@.P bProcessed=TRUE;
*,-)4)7d }
v1?P$f*g }
W1f]A#t< }
v_J\yW'K if(!bProcessed){
M@UkXA} for(int index=0;index<MAX_KEY;index++){
|j&u2DM~#m if(hCallWnd[index]==NULL)
CsS0(n(x continue;
E B)j&y_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
O66\s q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Zk$AAjC& }
6C9KT;6 }
.Ej `! }
,GS8Gu return CallNextHookEx( hHook, nCode, wParam, lParam );
YU*u! }
{=Z xF H>zX8qP+ BOOL InitHotkey()
. 5cL+G1k# {
U%<E9G594 if(hHook!=NULL){
jyLE nHookCount++;
xE.yh#?.k return TRUE;
sxP1.= W }
J*!_kg)>J else
Rhfx hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
<~d3L4h*< if(hHook!=NULL)
5.IX nHookCount++;
ekR/X return (hHook!=NULL);
uG\ @e'pr }
3QD+&9{D BOOL UnInit()
Ad:}i9-x {
-'jPue2\ if(nHookCount>1){
R:}u(N nHookCount--;
}G50?"^u return TRUE;
:(o6^%x }
u^{6U(% BOOL unhooked = UnhookWindowsHookEx(hHook);
C"=^(HU if(unhooked==TRUE){
pHpHvSI nHookCount=0;
*wOuw@09 hHook=NULL;
OalBr?^ }
eJm7}\/6` return unhooked;
"BAH=ul5E }
A7SE>e> 7KzMa%= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ju= +!nGUa {
:?}U Z# BOOL bAdded=FALSE;
V&>\U?q: for(int index=0;index<MAX_KEY;index++){
J"TM[4^\Y if(hCallWnd[index]==0){
6uAo0+-k hCallWnd[index]=hWnd;
cx(W{O"Jb HotKey[index]=cKey;
mGK-&|gq HotKeyMask[index]=cMask;
cIIt ;q[ bAdded=TRUE;
lv*fK KeyCount++;
5r$X break;
G\U'_G> }
clwJ+kku@ }
Y^(Sc4 W return bAdded;
W?B(Jsv }
BIr24N K[XFJ 9 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\\WIu? {
p`i_s(u BOOL bRemoved=FALSE;
N {$'-[ for(int index=0;index<MAX_KEY;index++){
g+-=/Ge if(hCallWnd[index]==hWnd){
,VM)ZK=Tr if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
c&o|I4|Y, hCallWnd[index]=NULL;
3N] HotKey[index]=0;
%!>~2=Q2* HotKeyMask[index]=0;
_Wjd`* bRemoved=TRUE;
p
FkqDU KeyCount--;
RNJUA^{ break;
nv9kl Q@ }
)/hb9+S }
SgOn:xg;3L }
Pc*+QtQ
return bRemoved;
Z{|U!tn }
H9^DlIv(' e (^\0 =u< void VerifyWindow()
+P&;cCV`S3 {
Ikkv <uY for(int i=0;i<MAX_KEY;i++){
:PrQ]ss@C5 if(hCallWnd
!=NULL){ W|PKcZ ]Uc
if(!IsWindow(hCallWnd)){ 3KF[ v{
hCallWnd=NULL; r] +V:l3
HotKey=0; r`Qzn" H
HotKeyMask=0; mkCv
f
KeyCount--; ?T\m
V}
} 39W6"^q"o
} >?$+hZz<
} 8%UI<I,
} 7DU"QeLeb
?Afx{H7
BOOL CHookApp::InitInstance() FZM9aA
{ H-Uy~Ry*T
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ccW z,[
hins=AfxGetInstanceHandle(); [8k7-}[
InitHotkey(); >qJRpO
return CWinApp::InitInstance(); uLw$`ihw
} 5N:THvh6o
u/5I;7cb
int CHookApp::ExitInstance() JNzNK.E!m-
{ *q8L$D
VerifyWindow(); vG'JMzAm
UnInit(); #L-3eW=f
return CWinApp::ExitInstance(); (ia(y(=C
} eZ]4,,m
OT_w<te
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 54kd>)|"ag
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nn@"68]g
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %@Nuzdp
#if _MSC_VER > 1000 zof>S>5>R7
#pragma once g?ID}E~<
#endif // _MSC_VER > 1000 #c V_p
L;=<d
class CCaptureDlg : public CDialog Gw6*0&3')
{ u4L&8@
// Construction K9FtFd
public: Vcg$H8m
BOOL bTray; gqaENU>
BOOL bRegistered; P`HE3?r
BOOL RegisterHotkey(); ~_P,z?
UCHAR cKey; 7FMg6z8~
UCHAR cMask; '&5A*X]d
void DeleteIcon(); qb y!
void AddIcon(); N(v<*jn
UINT nCount; U:eahK
void SaveBmp(); ?d1H]f<M
CCaptureDlg(CWnd* pParent = NULL); // standard constructor v\#69J5.>)
// Dialog Data >dol
//{{AFX_DATA(CCaptureDlg) 8$3G c"=
enum { IDD = IDD_CAPTURE_DIALOG }; m'$]lf;*
CComboBox m_Key; %|[+\py$Q
BOOL m_bControl; 7WG"_A~V
BOOL m_bAlt; RsS?ibozl
BOOL m_bShift; SrfDl*
CString m_Path; !o2lB^e8
CString m_Number; 9g#L"T=
//}}AFX_DATA )p7WU?&I
// ClassWizard generated virtual function overrides _dY6Ip%
//{{AFX_VIRTUAL(CCaptureDlg) ~Rx[~a
public: w%Tcx^:
virtual BOOL PreTranslateMessage(MSG* pMsg); Wyf+xr'Ky
protected: v;X'4/M
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 87zsV/
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q9w6 6R
//}}AFX_VIRTUAL k#TonT
// Implementation S,LW/:,
protected: ,~t{Q*#_h
HICON m_hIcon; yZbO{PMr
// Generated message map functions <U=:N~L
//{{AFX_MSG(CCaptureDlg) N=&~3k
virtual BOOL OnInitDialog(); Dh0`t@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |s
:b9sfA
afx_msg void OnPaint(); m M!H}|
afx_msg HCURSOR OnQueryDragIcon(); ba^cw}5
virtual void OnCancel(); [G^ir
afx_msg void OnAbout(); $VYMAk&\
afx_msg void OnBrowse(); /GNLZm^
afx_msg void OnChange(); zFh
JLH*C
//}}AFX_MSG lL~T@+J~
DECLARE_MESSAGE_MAP() 0t<]Uf
}; {w.rcObIw+
#endif iCCY222:
+5Yc/Qp
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2~+_T
#include "stdafx.h" K'~wlO@O
#include "Capture.h" _>B0q|]j4'
#include "CaptureDlg.h" =CEQYk-y1
#include <windowsx.h> 3Xaw
#pragma comment(lib,"hook.lib") RuDn1h#u{
#ifdef _DEBUG s8.O L_e
#define new DEBUG_NEW LbDhPG`u
#undef THIS_FILE @a)
x^d
static char THIS_FILE[] = __FILE__; zlIXia5
#endif dL'hC#!h
#define IDM_SHELL WM_USER+1 VL"!.^'c
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "; tl>Ot
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TOV531
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {~ ZSqd
class CAboutDlg : public CDialog FLJdnL
{ u1O?`
public: E~]8>U?V
CAboutDlg(); %B`MO-
// Dialog Data TjGe8L:
//{{AFX_DATA(CAboutDlg) DoAK]zyJA
enum { IDD = IDD_ABOUTBOX }; $;Lb|~
//}}AFX_DATA Lz2 AWqR
// ClassWizard generated virtual function overrides &*RJh'o|N(
//{{AFX_VIRTUAL(CAboutDlg) - XIjol(
protected: @yPa9Ug(V
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K~OfC
//}}AFX_VIRTUAL v:(_-8:F
// Implementation x(h(a#,r
protected: D+d\<":
//{{AFX_MSG(CAboutDlg) +Ck F#H ~
//}}AFX_MSG Qfr%BQV
DECLARE_MESSAGE_MAP() rxjMCMF
}; ~M`QFF
Q^4j
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !r$?66q/
{ Z{7lyEzBg
//{{AFX_DATA_INIT(CAboutDlg) 'h_PJ%
//}}AFX_DATA_INIT !1K<iz_8
} #bgW{&_y
vULlAQG
void CAboutDlg::DoDataExchange(CDataExchange* pDX) IwhZzw
w
{ S',i
CDialog::DoDataExchange(pDX); kxp$Nnk
//{{AFX_DATA_MAP(CAboutDlg) 'CsD[<
//}}AFX_DATA_MAP E6|!G
} >tXn9'S
Fy5xIRyI\F
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?I&ha-."
//{{AFX_MSG_MAP(CAboutDlg) |3W\^4>,
// No message handlers .j:[R.
//}}AFX_MSG_MAP +ia F$
END_MESSAGE_MAP() '$*d:1
1BUdl=o>S
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {ecmOxKP}
: CDialog(CCaptureDlg::IDD, pParent) 0{g @j{Lbz
{ od!"?F
//{{AFX_DATA_INIT(CCaptureDlg) |\"vHt?@G
m_bControl = FALSE; _;",7bT80
m_bAlt = FALSE; zd AqGQfc
m_bShift = FALSE; F;Ms6 "K
m_Path = _T("c:\\"); =cE:,z;g
m_Number = _T("0 picture captured."); R4GmUCKB=
nCount=0; 2j8^Z
bRegistered=FALSE; 5OP$n]|(
bTray=FALSE; ?#idmb}(
//}}AFX_DATA_INIT 6rP[*0[
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #k5WTcE
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `X]TIMc:Ad
} ) \Mwv&k1
IE!fNuR4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Yf
>SV #
{ Bt4
X
CDialog::DoDataExchange(pDX); w#g0nV"X6
//{{AFX_DATA_MAP(CCaptureDlg) [?VYxX@
DDX_Control(pDX, IDC_KEY, m_Key); ;xaOve;9
DDX_Check(pDX, IDC_CONTROL, m_bControl); [vb>5EhL!
DDX_Check(pDX, IDC_ALT, m_bAlt); rRyBGEj
DDX_Check(pDX, IDC_SHIFT, m_bShift); d)`XG cx{=
DDX_Text(pDX, IDC_PATH, m_Path); "H\'4'hg
DDX_Text(pDX, IDC_NUMBER, m_Number); Bi2be$nV
//}}AFX_DATA_MAP ;%P$q9*C
} N8|=K_;&
hM\<1D
CKG
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) CLU !/J$!
//{{AFX_MSG_MAP(CCaptureDlg) 'jWd7w~(
ON_WM_SYSCOMMAND() D"_~Njf
ON_WM_PAINT() I9P<!#q>
ON_WM_QUERYDRAGICON() 6r"uDV #0
ON_BN_CLICKED(ID_ABOUT, OnAbout) r1&b#r>
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -]c5**O}
ON_BN_CLICKED(ID_CHANGE, OnChange) 5&q@;vR
//}}AFX_MSG_MAP {bnNY
END_MESSAGE_MAP() bG=CIa&@
s.+2[R1HF
BOOL CCaptureDlg::OnInitDialog() N+)4]ir>
{ {Buoo~
CDialog::OnInitDialog(); V_jVVy30Ji
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J&UFP{)
ASSERT(IDM_ABOUTBOX < 0xF000); <y1V2Np
CMenu* pSysMenu = GetSystemMenu(FALSE); > ^fY`x,
if (pSysMenu != NULL) 9'F-D
{ ?P4@U9i
CString strAboutMenu; Dt?O_Bdv[
strAboutMenu.LoadString(IDS_ABOUTBOX); c7T9kV8hS
if (!strAboutMenu.IsEmpty()) QA7SQcd,
{ f2Frb
pSysMenu->AppendMenu(MF_SEPARATOR); 9frP`4<)
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "8|y
} Kd^{~Wlz&z
} H6?ZE
SetIcon(m_hIcon, TRUE); // Set big icon wJ-G7V,)
SetIcon(m_hIcon, FALSE); // Set small icon j eF1{ %
m_Key.SetCurSel(0);
@>f]0,"(
RegisterHotkey(); iJ_`ZM.w
CMenu* pMenu=GetSystemMenu(FALSE); 9i@AOU
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CBdSgHA3>
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |gEA.}
pY
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -a(f-
return TRUE; // return TRUE unless you set the focus to a control [Z6]$$!#2
} <K!5N&vh
AH`D&V
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Q(h,P+
{ .CFaBwj
if ((nID & 0xFFF0) == IDM_ABOUTBOX) )3v0ex@Jl
{ X&DuX %x0
CAboutDlg dlgAbout; *9e T#dH
dlgAbout.DoModal(); EB jiSQw
} tVQfR*=
else )l*H$8
{ \V`O-wcJ]S
CDialog::OnSysCommand(nID, lParam); @OAX#iQl
} )%%RI_JT
} cAC2Xq
eU_|.2
void CCaptureDlg::OnPaint() ?cdSZ'49[
{ ep<A d
if (IsIconic()) vai.",b=n6
{ 7t`<`BY^
CPaintDC dc(this); // device context for painting x-+[gNc
6
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;>[).fX>/
// Center icon in client rectangle g6EdCG.V
int cxIcon = GetSystemMetrics(SM_CXICON); xG0IA 7
int cyIcon = GetSystemMetrics(SM_CYICON); w=\Lw+X
CRect rect; !OM9aITv[
GetClientRect(&rect); \lHi=}0
int x = (rect.Width() - cxIcon + 1) / 2; ="
K;3a`GI
int y = (rect.Height() - cyIcon + 1) / 2; Pa2HFy2
// Draw the icon ~jAOGo/&6
dc.DrawIcon(x, y, m_hIcon); =BY)>0?z
} B5Rm z&
else )xCpQ=nS
{ ,S;?3? a
CDialog::OnPaint(); 'dM &~LSQ
} -yfyd$5j
} #C|:]moe
Ou/@!Y1
HCURSOR CCaptureDlg::OnQueryDragIcon() 8
W8ahG}
{ 6HpSZa
return (HCURSOR) m_hIcon; I^/Ugu
} Gdnk1_D>
#/sKb2eQ
void CCaptureDlg::OnCancel() u,[Yaw"L
{ |GE3.g
if(bTray) o*97Nbjn
DeleteIcon(); h*)spwF-
CDialog::OnCancel(); ?
Ldw\
} mU:C{<Z
tp$NT.z
void CCaptureDlg::OnAbout() >#dNXH]9
{ R6dw#;6{I
CAboutDlg dlg; 0*VRFd4
dlg.DoModal(); z;1tJ
} {>OuxVl??k
7M}T^LC
void CCaptureDlg::OnBrowse() (rFY8oHD
{ CU6rw+Vax
CString str;
hbR;zV|US
BROWSEINFO bi; NI=t)[\F
char name[MAX_PATH]; ZA>hN3fE'
ZeroMemory(&bi,sizeof(BROWSEINFO)); N-jFA8n
bi.hwndOwner=GetSafeHwnd(); !Qrlb>1z-
bi.pszDisplayName=name; ?PiJ7|
bi.lpszTitle="Select folder"; VZYdCZ&l7
bi.ulFlags=BIF_RETURNONLYFSDIRS; E5 H6&XU
LPITEMIDLIST idl=SHBrowseForFolder(&bi); -"Lia!Q]M
if(idl==NULL) n?@3R#4D3
return; '1ff| c!x9
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fMwJwMT8
str.ReleaseBuffer(); 2f`u?T
m_Path=str; gm8L5c
V
if(str.GetAt(str.GetLength()-1)!='\\') BMU~1[r
m_Path+="\\"; IvetQ+
UpdateData(FALSE); gd.P%KC!g
} @z$V(}(O^
)!3XM
void CCaptureDlg::SaveBmp() Cst\_j
{ Bcrd}'no
CDC dc; zF<*h~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7u,56V?X
CBitmap bm; 3nd02:GF
int Width=GetSystemMetrics(SM_CXSCREEN); {#uX
int Height=GetSystemMetrics(SM_CYSCREEN); TuwH?{
FzK
bm.CreateCompatibleBitmap(&dc,Width,Height); HoymGU`w
CDC tdc; Nol',^)
tdc.CreateCompatibleDC(&dc); $rs7D}VNc
CBitmap*pOld=tdc.SelectObject(&bm); T{]Tb=
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); p}uL%:Vr
tdc.SelectObject(pOld); t ?28s/?
BITMAP btm; !OPK?7
bm.GetBitmap(&btm); PmvTCfsg
DWORD size=btm.bmWidthBytes*btm.bmHeight; ho#]?Z#
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B^U5=L[:p
BITMAPINFOHEADER bih; HYLU]9aH8
bih.biBitCount=btm.bmBitsPixel; ?F*gFW_k
bih.biClrImportant=0; ^o !K0t*
bih.biClrUsed=0; f|?i6.N>f
bih.biCompression=0; V;=SncUb
bih.biHeight=btm.bmHeight; g Gg8O? Z
bih.biPlanes=1; %&Z!-k(
bih.biSize=sizeof(BITMAPINFOHEADER); !rb)Y;WQt
bih.biSizeImage=size; J\_tigd
bih.biWidth=btm.bmWidth; (o{QSk\
bih.biXPelsPerMeter=0; *ky5SM(NR
bih.biYPelsPerMeter=0; E~2}rK+#)
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rv;w`f
static int filecount=0; 0Z2![n
CString name; PQ@(p%
name.Format("pict%04d.bmp",filecount++); [rU8%
name=m_Path+name;
?.|qRzWL
BITMAPFILEHEADER bfh; vrGRZa
bfh.bfReserved1=bfh.bfReserved2=0; @s2z/h0H
bfh.bfType=((WORD)('M'<< 8)|'B'); y M , hF
bfh.bfSize=54+size; @`$8rck`
bfh.bfOffBits=54; ~8`r.1aUO
CFile bf; ;*wZgl
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p:k>!8.Qho
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zjM+F{P8
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); LEc%BQx
bf.WriteHuge(lpData,size); Jnb>u*7,
bf.Close(); Z?G-~3]e
nCount++; <bXfjj6YJ@
} *<xEM-
GlobalFreePtr(lpData); PS`v3|d}}}
if(nCount==1) }c|Xr^
m_Number.Format("%d picture captured.",nCount); vov"60K
else vxZvK0b620
m_Number.Format("%d pictures captured.",nCount); /=lrdp!a
UpdateData(FALSE); ^&h|HO-5
} tE9%;8;H
i~n>dc YW
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /tJJ2 =%l
{ 7od!:<v/
if(pMsg -> message == WM_KEYDOWN) <{3VK
{ jToA"udW/
if(pMsg -> wParam == VK_ESCAPE) u(\b1h n
return TRUE; $a(wM1S4
if(pMsg -> wParam == VK_RETURN) 1;4TA}'H
return TRUE; .B"h6WMz
} F4e<=R
return CDialog::PreTranslateMessage(pMsg); ts{Tk5+
} Sl
*'QD!Tc
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `Q,moz
{ (YGJw?]
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'X<R)E
SaveBmp(); elJLTG
return FALSE; [wjA8d.
} Xi6XV3G
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [L{q
CMenu pop; Qg%B<3 <
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L
V?- g
CMenu*pMenu=pop.GetSubMenu(0); ES(b#BlrP/
pMenu->SetDefaultItem(ID_EXITICON); W-<C%9O!
CPoint pt; u0A.I_
GetCursorPos(&pt); E-MEMran4
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eXc`"T,C.
if(id==ID_EXITICON) "/S-+Ufn
DeleteIcon(); 0AZ Vc
else if(id==ID_EXIT) ,l_"%xYx
OnCancel(); h&{9 &D1t
return FALSE; y['$^T?oP
} "S,,Bj L
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z0`Bn5
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)
qdx(wGG
AddIcon(); &
VJ+X|Z
return res; P bj &l0C
} ,j:`yB]4,
q3z<v:=1y
void CCaptureDlg::AddIcon()
D8m1:kU
{ 9G[!"eZ}
NOTIFYICONDATA data; dAh&Z:86\
data.cbSize=sizeof(NOTIFYICONDATA); "iMuA
CString tip; pV9$Vg?-H
tip.LoadString(IDS_ICONTIP); /vYuwaWG=
data.hIcon=GetIcon(0); jL8.*pfv
data.hWnd=GetSafeHwnd(); *?zmo@-
strcpy(data.szTip,tip); w<!F& kQB
data.uCallbackMessage=IDM_SHELL; \uQ yp*P1s
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e4fh<0gX
data.uID=98; 2-s ,PQno^
Shell_NotifyIcon(NIM_ADD,&data); DI{VJ&n66
ShowWindow(SW_HIDE); E z?O
gE{
bTray=TRUE; Iq]+O Q
} -y|>#`T/
)"/.2S;
void CCaptureDlg::DeleteIcon() v-B{7
~=#Z
{ ><V<}&:y$(
NOTIFYICONDATA data; $M5iU@A
data.cbSize=sizeof(NOTIFYICONDATA); M+j V`J!
data.hWnd=GetSafeHwnd(); J$F
1sy
data.uID=98; { 0RwjPYp
Shell_NotifyIcon(NIM_DELETE,&data); CBN,~wzP*
ShowWindow(SW_SHOW); ,bzE`6
SetForegroundWindow(); <j,ZAA&5%Y
ShowWindow(SW_SHOWNORMAL); _C2iP[YwQ{
bTray=FALSE; 2w_[c.
} !'8.qs
R}_B\# Q
void CCaptureDlg::OnChange() 97l<9^$
{ Gf_Je
RegisterHotkey(); ?41bZ$j
} #Z#rOh
C jISU$O
BOOL CCaptureDlg::RegisterHotkey() $9YAq/#Q
{ NX%"_W/W
UpdateData(); NOM6},rp
UCHAR mask=0; akATwSrU
UCHAR key=0; i=T!4'Zu
if(m_bControl) :d}I`)&
mask|=4; \e+h">`WgX
if(m_bAlt) /*Iq,"kGz
mask|=2; c|RTP
if(m_bShift) Of0(.-Q w
mask|=1; x7J8z\b"O
key=Key_Table[m_Key.GetCurSel()]; ##!idcC
if(bRegistered){ 2T 3tKX
DeleteHotkey(GetSafeHwnd(),cKey,cMask); pse$ S=
bRegistered=FALSE; 0Lb:N]5m8
} o|(Ivt7jk
cMask=mask; Vl'Gi44)3"
cKey=key; H c,e&R
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Gf71udaa
return bRegistered; #djby}hi
} n x4:n@J
nl<TM96
四、小结 |?A:[C#X
X!,huB^i
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。