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:
y]+i.8[
O-}{%)[ F 一、实现方法
Y(-4Agq Y!Wz7
C 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:
Mw*R~OX /mo4Q?^ #pragma data_seg("shareddata")
(9{)4[3MAG HHOOK hHook =NULL; //钩子句柄
&v'e;W UINT nHookCount =0; //挂接的程序数目
V)f/umT%g static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
+tES:3Pi static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
.@gv}`> static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[8(e`6xePb static int KeyCount =0;
~4`LOROC
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
-*M/,O #pragma data_seg()
A +e
={-* K
p~x 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。
p4*VE5[?_+ o}
YFDYi 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:
|!aMj8i2 Jp=ur)Dj BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
E,>/6AU cKey,UCHAR cMask)
O*`] ]w] {
XjuAVNY BOOL bAdded=FALSE;
[wj&.I{^s for(int index=0;index<MAX_KEY;index++){
5BN!uUkm+ if(hCallWnd[index]==0){
ggzg,~V hCallWnd[index]=hWnd;
hwSn?bkw HotKey[index]=cKey;
)apqL{u:= HotKeyMask[index]=cMask;
-;Y*;xe bAdded=TRUE;
c7[|x%~ KeyCount++;
C;-9_;& break;
,mx>)}l95 }
)k.;.7dXe }
b$l@Z&[] return bAdded;
+DY% Y
`0 }
%D)W~q-g //删除热键
Ze~^+ EE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Rjqeuyj:
{
jn&[=Y- BOOL bRemoved=FALSE;
'+hiCX-_ for(int index=0;index<MAX_KEY;index++){
qfd/t<?|D if(hCallWnd[index]==hWnd){
UpF,e>s if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
XkDjA#nx` hCallWnd[index]=NULL;
PxhB=i!'$ HotKey[index]=0;
kXFgvIpg< HotKeyMask[index]=0;
1
`hj]@.] bRemoved=TRUE;
/EZF5_`bT KeyCount--;
MN}@EQvW== break;
&}_E~jKK }
4onRO!G, }
w4\b^iJz }
f R$E*Jd return bRemoved;
/. k4Y }
d3v5^5kU \tc4DS C (L1 DLL中的钩子函数如下:
F.<sKQ&A l{[{pAm LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R4.$9_ui {
OlL
FuVR BOOL bProcessed=FALSE;
,B_Nz}\8 if(HC_ACTION==nCode)
hX#y7m {
(C
dx7v2Nh if((lParam&0xc0000000)==0xc0000000){// 有键松开
{*RyT.J switch(wParam)
.]SE>3 {
l}:&} case VK_MENU:
TRW{`b[ MaskBits&=~ALTBIT;
"CI#2tnL7 break;
j"{|* _6E_ case VK_CONTROL:
A.8{LY; MaskBits&=~CTRLBIT;
hsr,a{B%$ break;
LmE%`qNg case VK_SHIFT:
2Dgulx5kGZ MaskBits&=~SHIFTBIT;
o?BcpWp break;
:s`~m;Y9? default: //judge the key and send message
D[yOFJ~p) break;
j
qfxQ }
.Zv@iL5 for(int index=0;index<MAX_KEY;index++){
`dO)}}| y if(hCallWnd[index]==NULL)
Xxhzzm-B continue;
00X~/'! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Wnm?a!j5 {
a NhI<.v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9#Gz2u $ bProcessed=TRUE;
e"Kg/*Ji1 }
`a2%U/U }
SIQ 7oxS4 }
q$6fb)2I]e else if((lParam&0xc000ffff)==1){ //有键按下
"Qj;pqR switch(wParam)
r%QTUuRXC3 {
In<L?U?([D case VK_MENU:
sH(@X<{p MaskBits|=ALTBIT;
`"`/_al^ break;
xF![3~~3[ case VK_CONTROL:
\ <b-I MaskBits|=CTRLBIT;
}i0(^"SoXZ break;
!A!}j.s case VK_SHIFT:
f"My;K $l; MaskBits|=SHIFTBIT;
I<yd=#:n break;
`p0+j default: //judge the key and send message
++=t|ZS
U break;
]Y@Db5S$T }
Z3X/SQ'0 for(int index=0;index<MAX_KEY;index++){
y;aZMT.YI if(hCallWnd[index]==NULL)
,kS3Ioj continue;
M+4>l\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
M#ED49Dh> {
{6d)|';% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
vcm66J.14 bProcessed=TRUE;
Zt;3HY=y }
B'<k*9=Nv8 }
[\+"<;m$ }
GIG\bQSv2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
z !2-U for(int index=0;index<MAX_KEY;index++){
Y7{|iw(# if(hCallWnd[index]==NULL)
J=v"
HeVm continue;
H?A&P4nZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
hr9rI SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
qbcaiU`-^" //lParam的意义可看MSDN中WM_KEYDOWN部分
r: Ij\YQ }
2GB)K?1M }
/BeA-\B }
?5@!r>i=< return CallNextHookEx( hHook, nCode, wParam, lParam );
euO!vLd X }
4L<h%
'Zn =LLix .
> 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:
E$!0h_.( G?Fqm@J{XT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
$hv o^$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
gT3i{iU oTS/z\C"<u 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:
KA^r,Iw 'VVEd[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
;QZ}$8D 6Q {
E&js`24 & if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
zX=K2tH {
4R<bfZ43 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
y8~/EyY|^ SaveBmp();
(|Zah1k&] return FALSE;
!Miw.UmPm }
Y'n+,g …… //其它处理及默认处理
j'xk[bM }
F<R+]M:fa fSR+~Vy x$p_mWC 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。
M`m-@z DNYJR]> 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。
hzv4+1Wd[ uUy~$>V 二、编程步骤
,dyCuH!B
%4 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
{|:ro!& @ ={Hx$zL 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
\Z~|ry0v{d f&5'1tG 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;
cviPCjM kF,_o/Jc 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;
acG4u+[ ] CSu}_$wC# 5、 添加代码,编译运行程序。
Obj?, O =H8
LBM 三、程序代码
}fqz8'E9 3y9R1/! ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
I;u1mywd #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<.d^jgG(j #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
IZw>!KYG #if _MSC_VER > 1000
^}VAH#c #pragma once
p h5rS< #endif // _MSC_VER > 1000
CN(}0/ #ifndef __AFXWIN_H__
[9c|!w^F #error include 'stdafx.h' before including this file for PCH
c}$C=s5 h} #endif
l:'\3-2a #include "resource.h" // main symbols
a%FM)/oI|T class CHookApp : public CWinApp
0-VC$)S {
Y:;]qoF public:
]?1n-w.}r CHookApp();
L+GVB[@3Y // Overrides
PP1?UT=] // ClassWizard generated virtual function overrides
* |dz.Tr //{{AFX_VIRTUAL(CHookApp)
q`u ^ sc public:
-9f+O^x virtual BOOL InitInstance();
lPBWpHX virtual int ExitInstance();
#.KVT#%~{ //}}AFX_VIRTUAL
%qI.Qw$ //{{AFX_MSG(CHookApp)
sfo+B$4| // NOTE - the ClassWizard will add and remove member functions here.
N?Nu' // DO NOT EDIT what you see in these blocks of generated code !
;1gWz
//}}AFX_MSG
8?
U!PW DECLARE_MESSAGE_MAP()
4Y.o RB };
_{k-&I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
n^xB_DJ~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wr`+xYuuC= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kiP-^Wan BOOL InitHotkey();
,SVl>~! BOOL UnInit();
q$ZmR]p #endif
&N+i3l6` eI #b%h //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
|<2g^ZK) #include "stdafx.h"
:U{$G(
< #include "hook.h"
GJeP~ #include <windowsx.h>
<F%c"Rkh #ifdef _DEBUG
t5M"M{V #define new DEBUG_NEW
s+fjQo4 #undef THIS_FILE
Kn#CIFbBN static char THIS_FILE[] = __FILE__;
C2a2K={ #endif
Fk4T>8q2; #define MAX_KEY 100
_G62E$= #define CTRLBIT 0x04
9|{t%F=- #define ALTBIT 0x02
le*'GgU# #define SHIFTBIT 0x01
vB<2f*U #pragma data_seg("shareddata")
8hZYZ /T HHOOK hHook =NULL;
7A=*3 UINT nHookCount =0;
D\@)*" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
zn3]vU! static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
nD5+&M0 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
8aMmz!S static int KeyCount =0;
cxig <W static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
EjF2mkA* #pragma data_seg()
.0a,%o8n HINSTANCE hins;
6o
cTQ}= void VerifyWindow();
.Xm?tC< BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
K'@lXA: //{{AFX_MSG_MAP(CHookApp)
hN"cXz"/ // NOTE - the ClassWizard will add and remove mapping macros here.
4^IqHx;bj // DO NOT EDIT what you see in these blocks of generated code!
J=`2{
'l //}}AFX_MSG_MAP
Rk$ END_MESSAGE_MAP()
CTP!{<ii tbm/gOBw CHookApp::CHookApp()
YLU.]UC {
. l>. // TODO: add construction code here,
%p}xW V . // Place all significant initialization in InitInstance
|!?lwBs4 }
/hv2=A .[Nr2w:> CHookApp theApp;
O,_k.EH LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oa"_5kn, {
\&,{N_G#L. BOOL bProcessed=FALSE;
V/@7XAt if(HC_ACTION==nCode)
N2Qb+ {
:RG=3T[ if((lParam&0xc0000000)==0xc0000000){// Key up
']__V[ switch(wParam)
:<
*x G& {
8iwH^+h~ case VK_MENU:
n5z";:p MaskBits&=~ALTBIT;
b.#0{*/G break;
=c34MY(#X case VK_CONTROL:
}7+`[g MaskBits&=~CTRLBIT;
zEMZz$Y break;
tm|YUat$]r case VK_SHIFT:
:={rPj-nU MaskBits&=~SHIFTBIT;
#!>QXiyR break;
?#obNQ"u] default: //judge the key and send message
fpA%:V break;
.*~t2 : }
ai$s for(int index=0;index<MAX_KEY;index++){
pm>$'z!.): if(hCallWnd[index]==NULL)
dml,|k= continue;
dhCrcYn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@;b @O
_ {
9lR- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
A2p]BW& bProcessed=TRUE;
?C`&*+ }
E06)&tF }
UPGS/Xs]1 }
R\Of , else if((lParam&0xc000ffff)==1){ //Key down
r-'CB switch(wParam)
Xwz'h;Ks_ {
/1z3Q_M case VK_MENU:
r=cm(AHF MaskBits|=ALTBIT;
9?Q0O\&uP break;
E(miQ case VK_CONTROL:
#8CeTR23cw MaskBits|=CTRLBIT;
d]I3zSIC break;
i~i
?M) case VK_SHIFT:
>mUSRf4 MaskBits|=SHIFTBIT;
lDVw2J'p break;
}Q-%ij2 default: //judge the key and send message
^tRy6zG break;
l",X }
16|miK[@ for(int index=0;index<MAX_KEY;index++)
iL8:I)z {
n h&[e if(hCallWnd[index]==NULL)
CSVL,(Uw continue;
Mq Q'Kjo if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NhRKP"<CO {
bS&XlgnKi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
G@8wv J bProcessed=TRUE;
3,dIW*<** }
Rxl/)H[Lc" }
6vr8rJ- }
nPg,(8Tt if(!bProcessed){
YtFH@M for(int index=0;index<MAX_KEY;index++){
()ZP=\L if(hCallWnd[index]==NULL)
K0^Tg+U($p continue;
?!;i/h*{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/?B%,$~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|gwGCa+ }
>)8<d3m }
=
6.i.(L_S }
WJBwo%J return CallNextHookEx( hHook, nCode, wParam, lParam );
dCO7"/IHW }
>7(7 ['DYP-1J BOOL InitHotkey()
fIii {
N/8_0]Gf if(hHook!=NULL){
txFcV nHookCount++;
aFd87'^ return TRUE;
Zd~Q@+sH }
E, ;'n else
5$%CRm hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
q?=_{oH9 if(hHook!=NULL)
a'|/=$
nHookCount++;
n|Gw?@CU7 return (hHook!=NULL);
&]jCoBj+_ }
w|(
ix;pK BOOL UnInit()
.,&6 x. {
(&oT6Ji if(nHookCount>1){
Hq0O!Zv nHookCount--;
TLT6z[ return TRUE;
Np>0c-S }
v])R6-T- BOOL unhooked = UnhookWindowsHookEx(hHook);
JVq`v#8 if(unhooked==TRUE){
@jT=SFf nHookCount=0;
hO..j hHook=NULL;
tvR|!N } }
rPkPQn: return unhooked;
^.u
J]k0 }
5@yBUwMSj >e^8fpgSo BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
x>[f+Tc {
C3-I5q(V] BOOL bAdded=FALSE;
tr$d? for(int index=0;index<MAX_KEY;index++){
O_^
uLp if(hCallWnd[index]==0){
naiy] oY" hCallWnd[index]=hWnd;
uE^5o\To HotKey[index]=cKey;
oRQ(l I> HotKeyMask[index]=cMask;
m:5x"o7)ln bAdded=TRUE;
TykY> cl
KeyCount++;
KYC<*1k break;
3Ss)i7 }
gjc[\"0a5h }
=fcRH:B: return bAdded;
1pZ[rM'} }
qd@Fb* Bt(U,nFB BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(/gMtIw {
)g[7XB/w BOOL bRemoved=FALSE;
NY\-p=3c7= for(int index=0;index<MAX_KEY;index++){
[WBU_ if(hCallWnd[index]==hWnd){
L]3gHq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#p/'5lA&j hCallWnd[index]=NULL;
%40+si3c HotKey[index]=0;
(&xIBF_6 HotKeyMask[index]=0;
tN-B`d1 bRemoved=TRUE;
7-2,|(Xg KeyCount--;
<-N7Skkk! break;
?RU_SCp- }
,Laz515 }
2hFOwI }
C0-,<X return bRemoved;
;;<[_gp,E }
2/RW( U !Tu4V\^~A void VerifyWindow()
'OvyQ/T
{
Jk,}3Cr/ for(int i=0;i<MAX_KEY;i++){
Hg`2-
Nl if(hCallWnd
!=NULL){ V2BsvR`
if(!IsWindow(hCallWnd)){ 2X|nPhNi
hCallWnd=NULL; RxXiSc`^z
HotKey=0; }`D-]/T8.
HotKeyMask=0; gtJCvVj>g
KeyCount--; Ahrtl6@AS
} 7!('+x(>
} )d7U3i
} "j% L* J)
} aKk0kC
"-A@d&5.
BOOL CHookApp::InitInstance() `!7QegJa"
{ oxJ#NGD
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Rv@(
[rn+
hins=AfxGetInstanceHandle(); A=l1_8,`h
InitHotkey(); SS"Z>talw
return CWinApp::InitInstance(); h f9yK6
} QIu!o,B
%tZ[wwt
int CHookApp::ExitInstance() nWsR;~pK
{ Vho^a:Z9}W
VerifyWindow(); ^9 {r2d&c
UnInit(); ZY-mUg
return CWinApp::ExitInstance(); V(<(k,8=
} 0]MI*s>&
y>|AX/n
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 06fs,!Q@
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HFTDea +#
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ TDY =!
#if _MSC_VER > 1000 T[]kun
#pragma once m_,j)A%
#endif // _MSC_VER > 1000 9<6Hs3|.!
A:YWXcg
class CCaptureDlg : public CDialog <PTi>C8;r
{ cvO;xR
// Construction <G#z;]N
public: V|G[j\]E<
BOOL bTray; un(fr7NW
BOOL bRegistered; q($fl7}Y
BOOL RegisterHotkey(); eW zyydl
UCHAR cKey; r!HB""w
UCHAR cMask; Uiu9o]n
void DeleteIcon(); V SUz+W
void AddIcon(); >TddKR@C
UINT nCount; FaA7m
void SaveBmp(); GN
?1dwI
CCaptureDlg(CWnd* pParent = NULL); // standard constructor qwDoYyyu
// Dialog Data 62{[)jt{
//{{AFX_DATA(CCaptureDlg) ?%RR+(2m
enum { IDD = IDD_CAPTURE_DIALOG }; 4&'_~ qU
CComboBox m_Key; k
ks
?S',
BOOL m_bControl; :j(D&?ao
BOOL m_bAlt; Z=CY6Zu7
BOOL m_bShift; C;.+ kE
CString m_Path; S[L2vM)
CString m_Number; ybgAyJ{J<
//}}AFX_DATA SM8m\c
// ClassWizard generated virtual function overrides TCS^nBEE
//{{AFX_VIRTUAL(CCaptureDlg) /S\y-M9
public: 8WRxM%gsH
virtual BOOL PreTranslateMessage(MSG* pMsg); NzuH&o][
protected: :h)A/k_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }Q%fY(bp
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8I|2yvhP
//}}AFX_VIRTUAL |q*s)8
// Implementation )uIHonXU
protected: c0W4<(
HICON m_hIcon; N~@VZbS(6
// Generated message map functions fE&wtw{gi
//{{AFX_MSG(CCaptureDlg) 8GFA}_(^R
virtual BOOL OnInitDialog(); ZeYkZzN
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sKuPV
afx_msg void OnPaint(); 7{:g|dX
afx_msg HCURSOR OnQueryDragIcon(); Lmw{ `R
virtual void OnCancel(); HRZ3}8Qj
afx_msg void OnAbout(); I\peO/w
afx_msg void OnBrowse(); |?
l6S
afx_msg void OnChange(); n*U+jc
//}}AFX_MSG 6
&)fZt
DECLARE_MESSAGE_MAP() ."\&;:ZNv
}; =*?2+ ;
#endif sT"h)I)]*
{ei,>5K
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file w=S7zzL)
#include "stdafx.h" /]*#+;;%
#include "Capture.h" W mT(>JBO
#include "CaptureDlg.h" Z,bv D'u
#include <windowsx.h> \qh
-fW; #
#pragma comment(lib,"hook.lib")
.4-I^W"1
#ifdef _DEBUG p$A` qx<M_
#define new DEBUG_NEW 95CCje{o_
#undef THIS_FILE smt6).o
static char THIS_FILE[] = __FILE__; J((.zLvz
#endif 8{Id+Q>Vo,
#define IDM_SHELL WM_USER+1 Sk 10"D B/
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z/@%MEU[zl
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `nDgwp:b"
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1*Ui=M4
class CAboutDlg : public CDialog >{]mN5
{ qg;fh]j%
public: _Ak?i\
CAboutDlg(); X[
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// Dialog Data "x$RTuWA9
//{{AFX_DATA(CAboutDlg) KGI0|Z]n~
enum { IDD = IDD_ABOUTBOX }; 7VwLyy
//}}AFX_DATA P"WnU'+
// ClassWizard generated virtual function overrides h.W;Dmf6]
//{{AFX_VIRTUAL(CAboutDlg) I=3e@aTZ,
protected: uY;2tZldf=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {%;KkC8=R
//}}AFX_VIRTUAL zu
Jl #3YP
// Implementation `+(|$?C u
protected: GL_a`.=@
//{{AFX_MSG(CAboutDlg) .h8%zB#|i
//}}AFX_MSG uoe5@j2
DECLARE_MESSAGE_MAP() JyX7I,0
}; >r"~t70C~]
kFG>Km(y}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hp E?
{ "A_WU|
//{{AFX_DATA_INIT(CAboutDlg) 6QOdd6_d
//}}AFX_DATA_INIT {A2SG#}
} =e)[?{H
M7(vI4V
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0Up@+R2
{ G/Xa`4"_
CDialog::DoDataExchange(pDX); \
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//{{AFX_DATA_MAP(CAboutDlg) %#Vn?zr|~
//}}AFX_DATA_MAP Zbp ByRyN
} aO]0|<2
j
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) '`Smg3T!~S
//{{AFX_MSG_MAP(CAboutDlg) {t$
vsR
// No message handlers Odr@9MJ
//}}AFX_MSG_MAP Upr:sB
END_MESSAGE_MAP() nuB@Fkr
F`ifHO
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) o2 5kFD
: CDialog(CCaptureDlg::IDD, pParent) x hFQjV?V
{ *My? l75
//{{AFX_DATA_INIT(CCaptureDlg) 3d.JV'C'c
m_bControl = FALSE; @awaN
m_bAlt = FALSE; ,0#5kc*X
m_bShift = FALSE; 26E"Ui5q
m_Path = _T("c:\\"); .d5|Fs~B
m_Number = _T("0 picture captured."); gno V>ON0
nCount=0; W.ud<OKP90
bRegistered=FALSE; )T:{(v7 d`
bTray=FALSE; ]rDf3_!m(
//}}AFX_DATA_INIT h@72eav3+
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G^F4c{3c~
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); FhZ&^.:
} W9?Yzl
<4y1[/S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -0Q:0wU
{ 1WPDMLuN
CDialog::DoDataExchange(pDX); }`$:3mb&f
//{{AFX_DATA_MAP(CCaptureDlg) aho;HM$hjP
DDX_Control(pDX, IDC_KEY, m_Key); C9/?B:
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8kih81tx"U
DDX_Check(pDX, IDC_ALT, m_bAlt); \K)"@gdW
DDX_Check(pDX, IDC_SHIFT, m_bShift); Ho?+?YJ#P
DDX_Text(pDX, IDC_PATH, m_Path); W Io^=?%
DDX_Text(pDX, IDC_NUMBER, m_Number); 1{% EQhNd
//}}AFX_DATA_MAP aI|<t^X
} J!
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)}?'1ciHI
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^6 +P&MxM
//{{AFX_MSG_MAP(CCaptureDlg) MjG=6.J|`
ON_WM_SYSCOMMAND() f{lg{gA(
ON_WM_PAINT() LS?hb)7
ON_WM_QUERYDRAGICON() :x97^.eW~
ON_BN_CLICKED(ID_ABOUT, OnAbout) bG>pm|/
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0K,*FdA
ON_BN_CLICKED(ID_CHANGE, OnChange) 0z."6r
//}}AFX_MSG_MAP JW&/l
END_MESSAGE_MAP() >.PLD} zE_
Q/iaxY#
BOOL CCaptureDlg::OnInitDialog() mqk~Pno|<
{ /MSz{ %v
CDialog::OnInitDialog(); {t[j>_MYw
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?N#mD
ASSERT(IDM_ABOUTBOX < 0xF000); @4h .?
CMenu* pSysMenu = GetSystemMenu(FALSE); IBU(Hm1,
if (pSysMenu != NULL) /Z>#lMg\.
{ :9c
QK]O6
CString strAboutMenu; Mno4z/4{A
strAboutMenu.LoadString(IDS_ABOUTBOX); xrO:Y!C?
if (!strAboutMenu.IsEmpty()) c\.4I4uy
{ [dsH0 D&T
pSysMenu->AppendMenu(MF_SEPARATOR); qSMSTmnQ
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); El0|.dW
} Og%qv
Bj 6
} K|Std)6
SetIcon(m_hIcon, TRUE); // Set big icon /wI$}X5o~
SetIcon(m_hIcon, FALSE); // Set small icon p0uQ>[NV0
m_Key.SetCurSel(0); 0<Px2/
RegisterHotkey(); E$f.&<>T
CMenu* pMenu=GetSystemMenu(FALSE); %\[LM$f{z
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R|8)iW^
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .0#?u1gXsX
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B4GgR,P@S
return TRUE; // return TRUE unless you set the focus to a control ~tDV{ml
} T eG5|`t],
6{}]QvR
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $t-HJ<!
{ .BlGV 2@^#
if ((nID & 0xFFF0) == IDM_ABOUTBOX) T\b
e(@r
{ tp_*U,
CAboutDlg dlgAbout; %`HAg MgP
dlgAbout.DoModal(); }9>W41
} 9pStArF?F0
else =4/lJm``
{ j*g5f
CDialog::OnSysCommand(nID, lParam); WU{G_Fqaz
} sBq @W4
} qJVW :$1q
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void CCaptureDlg::OnPaint() F^&_O*"
{ .!,T>:R
if (IsIconic()) e0+N1kY
{ (<(8(}x
CPaintDC dc(this); // device context for painting 2>.B*P
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +Ld4e]
// Center icon in client rectangle zhKb|SV
int cxIcon = GetSystemMetrics(SM_CXICON); [st4FaQ36
int cyIcon = GetSystemMetrics(SM_CYICON); (m=-oQ&Ro
CRect rect; : UD<1fh
GetClientRect(&rect); sk$MJSE
~
int x = (rect.Width() - cxIcon + 1) / 2; O@'/B" &
int y = (rect.Height() - cyIcon + 1) / 2; P$N\o @
// Draw the icon XJC|6"n
dc.DrawIcon(x, y, m_hIcon); PR{?l
} d"Hh9O}6
else U8?QyG
2A
{ %gJf&A
CDialog::OnPaint(); zm9>"(H
} |9jeOV}/
} :|M0n%-X
YT}m
8Y
HCURSOR CCaptureDlg::OnQueryDragIcon() y0M^oLx
{
b(I-0<
return (HCURSOR) m_hIcon; ( m\PcF
} eFp4MD8?
%w=*4!NWb
void CCaptureDlg::OnCancel() O]~ cv^
{ VW I{ wC
if(bTray) =\ iV=1iB
DeleteIcon(); pz6fL=Xd
CDialog::OnCancel(); My76]\Psh
} n87B[R
x;99[C!$
void CCaptureDlg::OnAbout() +S5"4<
{ \d2Ku10v[
CAboutDlg dlg; S
j)&!
dlg.DoModal(); ,mhO\P96ik
} 6OF&Q`*4
sikG}p0mx<
void CCaptureDlg::OnBrowse() t`o-HWfS.
{ PR|F-/o
CString str; fDNiU"
BROWSEINFO bi; vtK Qv Q
char name[MAX_PATH]; `-"2(Gp
ZeroMemory(&bi,sizeof(BROWSEINFO)); "Up3W%]SB
bi.hwndOwner=GetSafeHwnd(); e]'ui<`
bi.pszDisplayName=name; 6x^#|;e>lI
bi.lpszTitle="Select folder"; y-)|u:~h
bi.ulFlags=BIF_RETURNONLYFSDIRS; !0CC &8C`
LPITEMIDLIST idl=SHBrowseForFolder(&bi); HbX>::J8
if(idl==NULL) ^J< I
Ia4
return; WOrz7x
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .EM0R\q
str.ReleaseBuffer(); 0WaC.C+2i
m_Path=str; B?`Gs^Y{z
if(str.GetAt(str.GetLength()-1)!='\\') O[U^{~iM
m_Path+="\\"; |`1lCyV\tE
UpdateData(FALSE); D kl4^}
}
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[ma'11?G
void CCaptureDlg::SaveBmp() WolkW:(Cg
{ :Gsh
CDC dc; [KLs}
~H
dc.CreateDC("DISPLAY",NULL,NULL,NULL); `|Pfa
CBitmap bm; 5f(yF
int Width=GetSystemMetrics(SM_CXSCREEN); SpU+y|\[0
int Height=GetSystemMetrics(SM_CYSCREEN); uPr'by
bm.CreateCompatibleBitmap(&dc,Width,Height); 2w>WS#
CDC tdc; PTWP7A[
tdc.CreateCompatibleDC(&dc); [fiB!G]?
CBitmap*pOld=tdc.SelectObject(&bm); D>|m8-@]
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lE=(6Q
tdc.SelectObject(pOld); yl/-!
BITMAP btm;
s!X@ l
bm.GetBitmap(&btm); 0?8O9i
DWORD size=btm.bmWidthBytes*btm.bmHeight; <^c?M[j
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); J]yUjnQ[h
BITMAPINFOHEADER bih; ?`bi8 Ck
bih.biBitCount=btm.bmBitsPixel; N DZ :`D
bih.biClrImportant=0; 1@rI4U@D
bih.biClrUsed=0; 0+L:+S
bih.biCompression=0; FNL[6.!PV
bih.biHeight=btm.bmHeight; 8/F}vfKEN
bih.biPlanes=1; +!h~T5Ck
bih.biSize=sizeof(BITMAPINFOHEADER); {+%|nOWV
bih.biSizeImage=size; l2vIKc
bih.biWidth=btm.bmWidth; dmI~$*
bih.biXPelsPerMeter=0; mSF>~D1_
bih.biYPelsPerMeter=0; VW: WB.K$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q>Voa&tYn
static int filecount=0; n}/?nP\%
CString name; M3P\1
name.Format("pict%04d.bmp",filecount++); yB0xa%
name=m_Path+name; }K':tX?
BITMAPFILEHEADER bfh; Q#w mS&$f
bfh.bfReserved1=bfh.bfReserved2=0; &YC Z
L
bfh.bfType=((WORD)('M'<< 8)|'B'); }N[|2nR'
bfh.bfSize=54+size; r@b M3V_o
bfh.bfOffBits=54;
mo+zq~,M
CFile bf; v|fA)Ww
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;,2i1m0"
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v;m`d{(i2
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o81RD#>E)
bf.WriteHuge(lpData,size); fy]z<SPhVJ
bf.Close(); hEUS&`K
nCount++; Z>hS&B
} ZeM~13[
GlobalFreePtr(lpData); [d
30mVM
if(nCount==1) Sggha~E2s
m_Number.Format("%d picture captured.",nCount); KZrg4TEVi
else a,mG5bQ!
m_Number.Format("%d pictures captured.",nCount);
r&
UpdateData(FALSE); e.-+zkQ8EI
} cjK\(b3
[PG#5.jwQ
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zwJB.4@
{ }
DQ<YF+
if(pMsg -> message == WM_KEYDOWN) dpG l
{ >=Bl/0YH
if(pMsg -> wParam == VK_ESCAPE) lw+Y_;
return TRUE; ASGV3r(
if(pMsg -> wParam == VK_RETURN) {zzc/!|
return TRUE; SB~HHx09
} DBTeV-G9~R
return CDialog::PreTranslateMessage(pMsg); OM,Dy&Y
} h0**[LDH
*rKj%Me
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <"/b 5kc
{ QguRU|y
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >A&D/kMO
SaveBmp(); @}9*rWJIE
return FALSE; 3DjlX*
} WxPu{N
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *^[m?3"W
CMenu pop; @yV.Yx"p_
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +"J2k9E
CMenu*pMenu=pop.GetSubMenu(0); E>LZw>^YJ
pMenu->SetDefaultItem(ID_EXITICON); ;c tPe[5
CPoint pt; *<HA])D,
GetCursorPos(&pt); eBT+|
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CgT5sk}
if(id==ID_EXITICON) m[aBHA^g
DeleteIcon(); iA.:{^_)09
else if(id==ID_EXIT) YQ? "~[mL
OnCancel(); ycD.X"
return FALSE; 9 +1}8"~
} #*;G8yV
LRESULT res= CDialog::WindowProc(message, wParam, lParam); EBQ,Ypv
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) aI. 5w9
AddIcon(); Z7]["
return res; M=rH*w{^
} <n4?wo
OQnb^fabY
void CCaptureDlg::AddIcon() uuaoBf
{ Cx~,wk;=
NOTIFYICONDATA data; ZNfQM&<d
data.cbSize=sizeof(NOTIFYICONDATA); eewlK]
CString tip; 'kuLkM,
tip.LoadString(IDS_ICONTIP); o?,c#g
data.hIcon=GetIcon(0); k2-+3zx
data.hWnd=GetSafeHwnd(); P~}Yj@2
strcpy(data.szTip,tip); ZuLW%z.
data.uCallbackMessage=IDM_SHELL; ol3].0Vc]
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =w !>/#U
data.uID=98; 9 AWFjoXl"
Shell_NotifyIcon(NIM_ADD,&data); zrDcO~w
ShowWindow(SW_HIDE); $I0&I[_LzK
bTray=TRUE;
M4H~]Ftn
} r;n^\[Ov0,
:<p3L!?8y
void CCaptureDlg::DeleteIcon() 1S{AGgls5
{ 62.)fCQ^
NOTIFYICONDATA data; J;DTh ]z?:
data.cbSize=sizeof(NOTIFYICONDATA); bVxbQ$
data.hWnd=GetSafeHwnd(); !kW~s_gUb*
data.uID=98; ;$.^
Shell_NotifyIcon(NIM_DELETE,&data); F[q)ME+`)
ShowWindow(SW_SHOW); N({0" 7
SetForegroundWindow(); BbIg]E/G
ShowWindow(SW_SHOWNORMAL); `;
+UWdAR
bTray=FALSE; "?AJ(>wP
} sq rY<@%
MV.&GUez{
void CCaptureDlg::OnChange() R$m?aIN
{ |S6L[Uo
RegisterHotkey(); :pJKZ2B,
} @@W-]SR
`g+Kv&546
BOOL CCaptureDlg::RegisterHotkey() rtxG-a56Q
{ \yhj {QS.k
UpdateData(); 1xTNrLW
UCHAR mask=0; FZBdQhYF
UCHAR key=0; % `\}#
if(m_bControl) pqF!1
mask|=4; P=<>H9p:o
if(m_bAlt) <SKzCp\
mask|=2; 6DuA
if(m_bShift) 'z9}I
#
mask|=1; dKpUw9C#/
key=Key_Table[m_Key.GetCurSel()]; xLShMv}
if(bRegistered){ GMKY1{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); dbG902dR
bRegistered=FALSE; G2
0
} ]?*'[
cMask=mask; wh2Ljskda8
cKey=key; wiP )"g.t
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "'3QKeM1
return bRegistered; ' e:rL.
} $!goM~pZ
,a34=,
四、小结 "1wjh=@z
.b|!FWHNS
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。