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:
or#]
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4<tbZP3/6) 一、实现方法
s[a\m, FO>!T@0G 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:
n CwA8AG 0'f\>4B #pragma data_seg("shareddata")
S@!_{da HHOOK hHook =NULL; //钩子句柄
p2(ha3PW UINT nHookCount =0; //挂接的程序数目
yp4[EqME static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
g?|Z/eVJ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
,d*1|oUw static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
l?IeZisX static int KeyCount =0;
O13]H"O_ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8.jf6 #pragma data_seg()
Q}^Ip7T l
z"o( %D 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$2#TWW5 @i> r(X DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
[z\baL| 8ZbXGQ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
L'a+1O1q&i cKey,UCHAR cMask)
%m/lPL {
r[^.\&- BOOL bAdded=FALSE;
i,"Xw[H*s for(int index=0;index<MAX_KEY;index++){
>Vx_Xv`Jwb if(hCallWnd[index]==0){
2gklGDJD hCallWnd[index]=hWnd;
sZ&6g<8#y HotKey[index]=cKey;
qT$ IV\;_ HotKeyMask[index]=cMask;
KF(y`(8f bAdded=TRUE;
ceJ#>Rj KeyCount++;
Jlb{1B$7 break;
EKcPJ\7 }
b{-"GqMO }
!oXFDC3k return bAdded;
#J3}H }
irm4lb5 //删除热键
QjXJo$I6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
aaf}AIL. {
f*"T]AX0 BOOL bRemoved=FALSE;
M `q|GY
for(int index=0;index<MAX_KEY;index++){
Eo^m; p5 if(hCallWnd[index]==hWnd){
"(W;rl
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ha;fxM] hCallWnd[index]=NULL;
Dz$w6d HotKey[index]=0;
LKI\(%ba# HotKeyMask[index]=0;
K%L6UQ; bRemoved=TRUE;
^S;{;c+' KeyCount--;
T<>B5G~% break;
]!!?gnPd5 }
4Zu1G#(zP }
E0 VAhN3G\ }
u59l)8= return bRemoved;
FXY>o>K%h }
8<0P Ssx P 0+@,kM <]%6x[ DLL中的钩子函数如下:
%U}6(~
h#}w18l LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
x
~)~v?>T {
stfniV BOOL bProcessed=FALSE;
V&ETt.91Ft if(HC_ACTION==nCode)
@8`I!fZ {
G na%|tUz| if((lParam&0xc0000000)==0xc0000000){// 有键松开
V.$tq switch(wParam)
EUI*:JU- {
;*zLf 9i case VK_MENU:
5*A5Y E- MaskBits&=~ALTBIT;
^1c7\"{ break;
y2?9pVLa\y case VK_CONTROL:
1k:yU( MaskBits&=~CTRLBIT;
6~ y' break;
l,Y5VGiH# case VK_SHIFT:
Wk3-J&QbS MaskBits&=~SHIFTBIT;
*szs"mQ/ break;
SX'NFdY default: //judge the key and send message
h*JN0O<b break;
1 Vc_jYO@ }
ECM#J28D for(int index=0;index<MAX_KEY;index++){
=$bF[3D if(hCallWnd[index]==NULL)
-le^ 5M7 continue;
TlyBpG=p if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
F~E)w5?\O {
1Zp/EYWa{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
u SI@Cjp bProcessed=TRUE;
YR~e_cA: }
:ln|n6X }
%=2sz>M+ }
4<}@hk
Y else if((lParam&0xc000ffff)==1){ //有键按下
D9P,[:" switch(wParam)
:,v(lq {
v,Z]Vqk case VK_MENU:
MIkp4A MaskBits|=ALTBIT;
.eVX/6, break;
L.;x=w case VK_CONTROL:
?&,6Y'" MaskBits|=CTRLBIT;
SfPQ;s' break;
3k>#z%// case VK_SHIFT:
!wd
wo0 MaskBits|=SHIFTBIT;
'^WR5P<8c break;
(t5y$bc default: //judge the key and send message
}yrs6pQ break;
zb[kRo&a0W }
g%]<sRl:- for(int index=0;index<MAX_KEY;index++){
LzLJ6A>;R if(hCallWnd[index]==NULL)
]Z\ W%'q+ continue;
_nzq(m1@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,MJddbcg {
G6>sAOf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6A5.n?B{ bProcessed=TRUE;
A_ &IK;-go }
%YF
/=l }
{_.(,Z{ }
\6APU7S if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
B [YyA for(int index=0;index<MAX_KEY;index++){
FdnLxw if(hCallWnd[index]==NULL)
I+kL;YdS continue;
3l`"(5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
cy
mC?8< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
.Xf_U.h$*@ //lParam的意义可看MSDN中WM_KEYDOWN部分
)$f?v22 }
*UW 8|\; }
3I}AA.h'00 }
$,r%@'= & return CallNextHookEx( hHook, nCode, wParam, lParam );
0)h.[O8@> }
{U3jJ#K \pK&gdw 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:
xo @|;Z>&F /{8Y,pZbu BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
@##}zku BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
H*0g*( +RpCh!KP 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:
zCA8}](C^ 3K~^H1l LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"N&ix*($ {
@|ZUyat if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
b|x B< {
x%@M*4:& //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
GadY#]}( SaveBmp();
/#:*hn return FALSE;
]x8Y]wAU&{ }
|SMigSu r` …… //其它处理及默认处理
#>_fYjT }
}2BNy9q@ hF^JSCDz l >zJk G9a 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。
yCkWuU9 O(0a l#Fvj 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。
BOvJEs!UX f`>\bdz 二、编程步骤
tQ'R(H` @pv:uON\ 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";
Qz{Vl>" g9g ]X 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
.uX(-8n ~ ny^uNIRPR 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;
]CS
N7Q+l Mx93D
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;
dXY}B=C 5B8/"G 5、 添加代码,编译运行程序。
*qL2=2 leizjL\P 三、程序代码
y<`:I|y $ <[r3 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
;*Y+. ?>a #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
5gx;Bp^_ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
*) \y52z #if _MSC_VER > 1000
5$Kv%U #pragma once
x3Fn'+ #endif // _MSC_VER > 1000
GP^^
K #ifndef __AFXWIN_H__
Eqny'44 #error include 'stdafx.h' before including this file for PCH
%(?;` #endif
vft7-|8T #include "resource.h" // main symbols
{ByKTx& class CHookApp : public CWinApp
#|:q"l9 {
#X!seQ7a public:
*}(B"FSO CHookApp();
r_']; // Overrides
!.@:t`w // ClassWizard generated virtual function overrides
4^Ks!S>K{8 //{{AFX_VIRTUAL(CHookApp)
BUh(pS: public:
G6Wa0Z virtual BOOL InitInstance();
g;o5m} virtual int ExitInstance();
k-s|gC4 //}}AFX_VIRTUAL
cqZlpm$c //{{AFX_MSG(CHookApp)
7I(QTc)* // NOTE - the ClassWizard will add and remove member functions here.
c(3idO*R) // DO NOT EDIT what you see in these blocks of generated code !
2"Unk\Y //}}AFX_MSG
jgpF+V-n$ DECLARE_MESSAGE_MAP()
V*%><r };
1)N# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
LG(" <CU BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
vPy."/[u BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
UAI'tRYN_ BOOL InitHotkey();
/k\)q BOOL UnInit();
eeBw\f0 #endif
6_9@s*=d> m9D*I1 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Dg
~k"Ice #include "stdafx.h"
65+2+p #include "hook.h"
"x_G6JE4tv #include <windowsx.h>
brCL"g|} #ifdef _DEBUG
nM8'="$ #define new DEBUG_NEW
@v/Ae_q! #undef THIS_FILE
0Y~5|OXJ static char THIS_FILE[] = __FILE__;
YO@~y*, #endif
J<cY'?D #define MAX_KEY 100
.k!2{A #define CTRLBIT 0x04
G [yI[7=d #define ALTBIT 0x02
sC :.}6 #define SHIFTBIT 0x01
Y{4nBu #pragma data_seg("shareddata")
`v/p4/ HHOOK hHook =NULL;
7Z}T!HFMr UINT nHookCount =0;
KlwBoC/{K static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
e<u~v0rDl static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Fb{HiU9<! static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
1[RI
07g7* static int KeyCount =0;
vBY?3p,0p static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kk
CoOTe& #pragma data_seg()
#N97 HINSTANCE hins;
_w5c-\-PUM void VerifyWindow();
;t.)A3 PL BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
te>Op 1R //{{AFX_MSG_MAP(CHookApp)
x+Ly,9nc$ // NOTE - the ClassWizard will add and remove mapping macros here.
q?0&0 // DO NOT EDIT what you see in these blocks of generated code!
1yc$b+TH //}}AFX_MSG_MAP
[A;0IjKam END_MESSAGE_MAP()
R&/"?&pfa =|
r%
lx CHookApp::CHookApp()
e&<=+\ul {
v+d`J55 // TODO: add construction code here,
1:I _;O_ // Place all significant initialization in InitInstance
j2hp*C'^ }
gb^'u `7V'A CHookApp theApp;
>(W t LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[/J(E\9 {
6* tky; BOOL bProcessed=FALSE;
8feLhWg'P if(HC_ACTION==nCode)
/)Weg1b {
9J}^{AA if((lParam&0xc0000000)==0xc0000000){// Key up
E,A9+OKxJ switch(wParam)
soB_j {
4)snt3k case VK_MENU:
catJC3 MaskBits&=~ALTBIT;
]6WP;.[ break;
jyRz53 case VK_CONTROL:
J@q!N;eh| MaskBits&=~CTRLBIT;
#\LYo{op/. break;
KM
oDcAjH case VK_SHIFT:
# *7ImEN MaskBits&=~SHIFTBIT;
zK: 2.4 break;
v +?'/Q% default: //judge the key and send message
GRgpy break;
=d
JRBl }
OK:YnSk " for(int index=0;index<MAX_KEY;index++){
t1o_x}z4. if(hCallWnd[index]==NULL)
]rO/IuB continue;
VQ2B|v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o~'UWU'# {
1L_(n
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
h7}P5z0F bProcessed=TRUE;
;'4Kg@/ }
}~ga86:n0 }
n=h!V$X }
-D_xA10 else if((lParam&0xc000ffff)==1){ //Key down
|f[:mO switch(wParam)
U;U19[] {
RXhT{Ho(> case VK_MENU:
d]^\qeG^p MaskBits|=ALTBIT;
!$,e)89 break;
4+N9Ylh case VK_CONTROL:
ENZYrWl
MaskBits|=CTRLBIT;
XpP}(A@G break;
F:G
Vysy case VK_SHIFT:
|OBZSk1jp MaskBits|=SHIFTBIT;
<d3a break;
"A}2iI default: //judge the key and send message
6[]O3Aa break;
\.`{nq }
o5w = for(int index=0;index<MAX_KEY;index++)
\r\wqz7 {
u< 5{H='6 if(hCallWnd[index]==NULL)
?Aky!43 continue;
n!?u/[@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
aN"dk-eK {
xcXnd"YYE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9P-I)ZqL bProcessed=TRUE;
kO8oH8Vt }
%uy?@ e }
fSm|anuKZe }
ia%U;M if(!bProcessed){
'# J/e0o@ for(int index=0;index<MAX_KEY;index++){
b5UIX Kim if(hCallWnd[index]==NULL)
g;</ |Z continue;
pIvr*UzY if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
I oC}0C7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_I#a`G }
iaQ3mk# }
2NWQiSz }
R-BN}ZS return CallNextHookEx( hHook, nCode, wParam, lParam );
m)xz_Plc }
!;&{Q^} l|
QQ BOOL InitHotkey()
PA${<wyBR_ {
zWq&HBs if(hHook!=NULL){
ID$%4jl nHookCount++;
\7tJ)[0aF return TRUE;
c8qwsp }
h1Q rFPQnu else
}LdeU:E4 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
gib;> nuBK if(hHook!=NULL)
ne'Y {n(8% nHookCount++;
Jnq}SUev return (hHook!=NULL);
.OvH<%g!. }
NAEAvXj BOOL UnInit()
-F';1D!l% {
bBXUD;$ if(nHookCount>1){
2@$`xPg
nHookCount--;
hkvymHaG return TRUE;
|6zx
YuX }
,gn**E BOOL unhooked = UnhookWindowsHookEx(hHook);
~5wT|d if(unhooked==TRUE){
@DCw(.k* nHookCount=0;
:3 By7BZgj hHook=NULL;
K}Rq<zW }
6kHb*L Je return unhooked;
#s|/5[i }
FDIOST ! Gbc2\A\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[|oOP$u {
JCZ 5q9b BOOL bAdded=FALSE;
kk7M$)>d for(int index=0;index<MAX_KEY;index++){
E'F87P ^> if(hCallWnd[index]==0){
H mVpxD+ hCallWnd[index]=hWnd;
s7na!A[ HotKey[index]=cKey;
oD7^9=# HotKeyMask[index]=cMask;
0^zp*u bAdded=TRUE;
Mp`i@pm+ KeyCount++;
sWX\/Iyy2p break;
D=!5l4 }
Wx F0LhM
}
)W$@phY(I return bAdded;
$|!@$A j }
9i/VvW _J33u3v BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[5s4Jp$+ {
C!S(!Z, BOOL bRemoved=FALSE;
XiN@$ for(int index=0;index<MAX_KEY;index++){
_6{XqvWqb if(hCallWnd[index]==hWnd){
{x/)S*:Z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=9cN{&qf hCallWnd[index]=NULL;
.
I#dR* HotKey[index]=0;
dpI! {'"M HotKeyMask[index]=0;
SW*Yu{ bRemoved=TRUE;
}Jk=ZBVjT7 KeyCount--;
Bq#B+JwX break;
>r5s>A[YC }
B/ACU }
E3,Nc`'m9 }
Xmaj7*f>p return bRemoved;
\tZZn~ex }
E|hW{ oX3 WeRX ~ void VerifyWindow()
gC\^"m {
h(3ko
An for(int i=0;i<MAX_KEY;i++){
D;WQNlTU if(hCallWnd
!=NULL){ \ q=Bbfzv
if(!IsWindow(hCallWnd)){ G7d)X^q!xS
hCallWnd=NULL; KPMId`kf
HotKey=0; cuo'V*nWQ
HotKeyMask=0; u(Y?2R
KeyCount--; Y SD|#0
} 4WZ"8
} O2C&XeB:4
} $jgEB+
} \N"=qw^ t
FW--|X]8
BOOL CHookApp::InitInstance() qQx5n
{ :x/L.Bz
AFX_MANAGE_STATE(AfxGetStaticModuleState()); n6s[q-td
hins=AfxGetInstanceHandle(); = s$UU15
InitHotkey(); k1Thjt
return CWinApp::InitInstance(); yUp"%_t0
} S
0L"5B@
0dKi25J
int CHookApp::ExitInstance() f<v:Tg.[
{ KJ;NcUq
VerifyWindow(); !Au 9C
UnInit(); \rY<DxtOq
return CWinApp::ExitInstance(); $3Srr*
} qJf=f3
:Vl2\H=P
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;Alw`'
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) m03]SF(#3
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7z^\}&
#if _MSC_VER > 1000 t~@~XI5
#pragma once w*7BiZ{s<
#endif // _MSC_VER > 1000 0)T`&u3!
Ed=]RR4R
class CCaptureDlg : public CDialog 25CO_
{ F9 q9BH
// Construction F1UTj"<e
public: #>@~3kGg
BOOL bTray; &['cZ/bM
BOOL bRegistered; @Ap~Wok
BOOL RegisterHotkey(); [
bB
UCHAR cKey; Dhy@!EOS
UCHAR cMask; vgvJ6$#
void DeleteIcon(); K\a=bA}DG
void AddIcon(); 8KhE`C9z
UINT nCount; `oUuAL
void SaveBmp(); mhZ60 RW
CCaptureDlg(CWnd* pParent = NULL); // standard constructor iF1E 5{dH
// Dialog Data "<5su5]
//{{AFX_DATA(CCaptureDlg) 60r4%>d
enum { IDD = IDD_CAPTURE_DIALOG }; =&
.KKr
CComboBox m_Key; [$[1|r
*Q
BOOL m_bControl; ^jxV
BOOL m_bAlt; p!]$!qHO(
BOOL m_bShift; u#uT|a.
CString m_Path; F1aI4H<(T
CString m_Number; sGdlS&08(
//}}AFX_DATA Az"(I>VfD
// ClassWizard generated virtual function overrides -p\uW0XA
//{{AFX_VIRTUAL(CCaptureDlg) EA+}Rf6}
public: )r^)e4UI
virtual BOOL PreTranslateMessage(MSG* pMsg); bQFMg41*w7
protected: mzkv/
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r p^Gk
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /9..hEq^
//}}AFX_VIRTUAL NiCB.a
// Implementation !?u{2D
protected: ~gAp`Q
HICON m_hIcon; q!+&|F
// Generated message map functions L 2k?Pl
//{{AFX_MSG(CCaptureDlg) <5wk~|@t
virtual BOOL OnInitDialog();
<B%s9Zy
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V<%eWT)x7C
afx_msg void OnPaint(); 9;*-y$@
afx_msg HCURSOR OnQueryDragIcon(); &>]c"?C*
virtual void OnCancel(); ;5(ptXX1W
afx_msg void OnAbout(); FhkS"y
afx_msg void OnBrowse(); 2y0J~P! I
afx_msg void OnChange(); ,m)k;co^
//}}AFX_MSG [hl8LP+~
DECLARE_MESSAGE_MAP() sKK*{+,kh;
}; =T0;F0@#4
#endif ]s))O6^f
l,n
V*Z
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 6~@S,i1
#include "stdafx.h" fi.[a8w:W
#include "Capture.h" QSxR@hC
#include "CaptureDlg.h" 3w-0IP]<
#include <windowsx.h> $V0G[!4
#pragma comment(lib,"hook.lib") Bl"BmUn
#ifdef _DEBUG =KctAR;
#define new DEBUG_NEW 5RysN=czA
#undef THIS_FILE 7\?0d!
static char THIS_FILE[] = __FILE__; IW<nfg
#endif BlrZ<\-/
#define IDM_SHELL WM_USER+1 (ndTEnpp
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6|-V{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hhU:
nw
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s.p4+KJ
class CAboutDlg : public CDialog qQ%RnD9
{ D%+cf
public: i6@c@n
CAboutDlg(); x #Um`
// Dialog Data 5UgxuuP4
//{{AFX_DATA(CAboutDlg) 8o SNnT
enum { IDD = IDD_ABOUTBOX }; \(db1zmS~
//}}AFX_DATA xR`W9Z5
// ClassWizard generated virtual function overrides vTdJe
//{{AFX_VIRTUAL(CAboutDlg) hN3*]s;/6z
protected: X'
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virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e2X\ll
//}}AFX_VIRTUAL CC8)yO
// Implementation _3'FX#xc
protected: LW$(;-rY
//{{AFX_MSG(CAboutDlg) T|o ]8z
//}}AFX_MSG v,VCbmc
DECLARE_MESSAGE_MAP() $xK2M
}; 'fGB#uBt
$gv3Up"U
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7`c\~_Df_
{ y|7sh
//{{AFX_DATA_INIT(CAboutDlg) ~.*G%TW &V
//}}AFX_DATA_INIT .a0]1IkatV
} $k,wA8OZ-
&P@dx=6d
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q,f~7IVX
{ b-+~D9U<
CDialog::DoDataExchange(pDX); 0S%xm'|N
//{{AFX_DATA_MAP(CAboutDlg) l
7XeZ} S
//}}AFX_DATA_MAP nN]GO}
} 1j!LK-
w I7iE4\vz
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1_of;=9V
//{{AFX_MSG_MAP(CAboutDlg) KS3>c7
// No message handlers \Xr
Sn_p-
//}}AFX_MSG_MAP I+4#LR3;
END_MESSAGE_MAP() =G9 9U/
U_8 Z&
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fVXZfq6
: CDialog(CCaptureDlg::IDD, pParent) 6`
8H k;
{ VPh0{(O^=
//{{AFX_DATA_INIT(CCaptureDlg) ;Eer
m_bControl = FALSE; j^Vr!y
m_bAlt = FALSE; @X?7a]+;8
m_bShift = FALSE; OABMIgX
m_Path = _T("c:\\"); ?DwI>< W
m_Number = _T("0 picture captured."); 4Ucs9w3[
nCount=0; 4*D'zJsJ
bRegistered=FALSE; r+D ?_Lk
bTray=FALSE; 0'3f^Ajf
//}}AFX_DATA_INIT KmYSYNr@,
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +}.~"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); vR)f'+_Nz
} wi gs1
jv4O
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) QH d^?H*
{ F+m%PVW:
CDialog::DoDataExchange(pDX); 2YbI."ob
//{{AFX_DATA_MAP(CCaptureDlg) D"z3SLFW{
DDX_Control(pDX, IDC_KEY, m_Key); O)jpnNz
DDX_Check(pDX, IDC_CONTROL, m_bControl); R[#vFQ
DDX_Check(pDX, IDC_ALT, m_bAlt); X9-WU\?UC
DDX_Check(pDX, IDC_SHIFT, m_bShift); nqFJNK]a
DDX_Text(pDX, IDC_PATH, m_Path); ){I0
DDX_Text(pDX, IDC_NUMBER, m_Number); 7'~Oai~r
//}}AFX_DATA_MAP ;J>upI
} ^7Hwpn7E
C$+z1z.!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) IW{}l=D/
//{{AFX_MSG_MAP(CCaptureDlg) Mjon++>Z
ON_WM_SYSCOMMAND() wwuM!Z+
ON_WM_PAINT() k Xg&}n7
ON_WM_QUERYDRAGICON() sP'U9l
ON_BN_CLICKED(ID_ABOUT, OnAbout) Sk6B>O <:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zJ
$&`=
ON_BN_CLICKED(ID_CHANGE, OnChange) '-l.2IUyT
//}}AFX_MSG_MAP q^ w@l
END_MESSAGE_MAP() E
xls_oSp
}mYxI^n
BOOL CCaptureDlg::OnInitDialog() 7K 'uNPC
{ z8@[]6cW
CDialog::OnInitDialog(); K7-z.WTUR
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8)o%0#;0B
ASSERT(IDM_ABOUTBOX < 0xF000); hE;|VSdo
CMenu* pSysMenu = GetSystemMenu(FALSE); [KMNMg
if (pSysMenu != NULL) z%Eok
{ +7KRoF |
CString strAboutMenu; 7@1GSO: Yf
strAboutMenu.LoadString(IDS_ABOUTBOX); !\}X?Gf
if (!strAboutMenu.IsEmpty()) B" 0a5-pkr
{ N*`qsv0
pSysMenu->AppendMenu(MF_SEPARATOR); H,3WdSL`K
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K0usBA
} )4e8LO
} cFZcBiw
SetIcon(m_hIcon, TRUE); // Set big icon 'nT#c[x[0
SetIcon(m_hIcon, FALSE); // Set small icon }1#prQ0F
m_Key.SetCurSel(0); YZk.{#^ c
RegisterHotkey(); XkhGU?={
CMenu* pMenu=GetSystemMenu(FALSE); 67g"8R#.V
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FX1H2N(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a_3w/9L4r
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (uVL!%61k
return TRUE; // return TRUE unless you set the focus to a control W8_$]}G8E
} sxn{uRF
!kS/Ei
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |pG%]?A
{ Q@
Ze+IhK`
if ((nID & 0xFFF0) == IDM_ABOUTBOX) X5tx(}j
{ srQGqE~
CAboutDlg dlgAbout; %xv*#.<Vj
dlgAbout.DoModal(); eev-";c
} 3`TD>6rs
else )kT.3
Q
{ {ldt/dl~
CDialog::OnSysCommand(nID, lParam); bP Q=88*
} RuGG3"|
} fgoLN\
ictV7)
void CCaptureDlg::OnPaint() WS ^,@>A
{ f.Y [2b
if (IsIconic()) T jE'X2/
{ ,rS?^"h9
CPaintDC dc(this); // device context for painting I<rT\':9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )~ 0TGy|
// Center icon in client rectangle mKBO<l{S
int cxIcon = GetSystemMetrics(SM_CXICON); b+CJRB1
int cyIcon = GetSystemMetrics(SM_CYICON); VTa%
CRect rect; 5HaI$>h6
GetClientRect(&rect); c;Gf$9?iC
int x = (rect.Width() - cxIcon + 1) / 2; c`@";+|r
int y = (rect.Height() - cyIcon + 1) / 2; PbnAY{J
// Draw the icon L++qMRk9
dc.DrawIcon(x, y, m_hIcon); D&{CC
} ek"Uq RY
else L|L;<
{ aka)#0l .
CDialog::OnPaint(); FP'-=zgc
} #U(kK(uO
} `&9iC 4P
63i&<
HCURSOR CCaptureDlg::OnQueryDragIcon() 9:P\)'y?
{ dmWCNeja.
return (HCURSOR) m_hIcon; T#<Q[h=
} (6Ciqf8
!nsx!M
void CCaptureDlg::OnCancel() %:v<&^oDlm
{ ?>Ngsp>-P
if(bTray) 2?{'(iay
DeleteIcon(); 9:*[Q"v
CDialog::OnCancel(); 6>]w1
H
} ;0U*N &
f
HbRvU}C1
void CCaptureDlg::OnAbout() iB|htH'T
{ nV`U{}x
CAboutDlg dlg; DL<;qhte
dlg.DoModal(); {- &`@V
} Eq%f`Qg+1E
K3Bw3j 9
void CCaptureDlg::OnBrowse() n@L@pgo%~
{ %Zp|1J'"
CString str; fD lo L
BROWSEINFO bi; ('{aOiSH
char name[MAX_PATH]; _, E/HAX
ZeroMemory(&bi,sizeof(BROWSEINFO)); Cs(sar:7
bi.hwndOwner=GetSafeHwnd(); >(-A"jf
bi.pszDisplayName=name; *4e?y
bi.lpszTitle="Select folder"; \1SC:gN*#
bi.ulFlags=BIF_RETURNONLYFSDIRS; ]}kw'&
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ap8q`a{j^
if(idl==NULL) 4l7
Ny\J
return; zn>+\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); wBvVY3VQ^
str.ReleaseBuffer(); =P%&]5ts
m_Path=str; Q:|W/RD~
if(str.GetAt(str.GetLength()-1)!='\\') L9<\vJ
m_Path+="\\"; ?;_*8Doq-a
UpdateData(FALSE); 1BEs> Sm
} '$c9 S[
r6nnRN/S=
void CCaptureDlg::SaveBmp() :w-:B^VB
{ KIcIYCBz
CDC dc; Z+u.LXc|c
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 51`&%V{daL
CBitmap bm; }h=PW'M{
int Width=GetSystemMetrics(SM_CXSCREEN); 1yZA_x15:
int Height=GetSystemMetrics(SM_CYSCREEN); L$i:~6
bm.CreateCompatibleBitmap(&dc,Width,Height); *:Rs\QH
CDC tdc; [}M!ez
tdc.CreateCompatibleDC(&dc); q-+:1E
CBitmap*pOld=tdc.SelectObject(&bm); F}7sb#G
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5.*,IedY
tdc.SelectObject(pOld); ? 3OfiGX?
BITMAP btm; X i1|%
bm.GetBitmap(&btm); `IEA
DWORD size=btm.bmWidthBytes*btm.bmHeight; haY]gmC
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _-lE$
O
BITMAPINFOHEADER bih; |g.CS$'#Nt
bih.biBitCount=btm.bmBitsPixel; 33EF/k3vW
bih.biClrImportant=0; Av?R6
bih.biClrUsed=0; BM/o7%]n
bih.biCompression=0; l=b!O
bih.biHeight=btm.bmHeight; !\<a2>4$T
bih.biPlanes=1; <gFa@at
bih.biSize=sizeof(BITMAPINFOHEADER); vc&v+5Y
bih.biSizeImage=size; pY@QR?F\
bih.biWidth=btm.bmWidth; swxX3GR
bih.biXPelsPerMeter=0; Pmo<t6
bih.biYPelsPerMeter=0; :dh; @kp
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &92/qRh7
static int filecount=0; +]nIr'V
CString name; MqB@}!
name.Format("pict%04d.bmp",filecount++); +C8O"
name=m_Path+name; eb}P/
BITMAPFILEHEADER bfh; n."n?C'{
bfh.bfReserved1=bfh.bfReserved2=0; 0F@ ~[W|2
bfh.bfType=((WORD)('M'<< 8)|'B'); a_V\[V{R=
bfh.bfSize=54+size; _FYA? d}
bfh.bfOffBits=54; Hf@4p'
CFile bf; mf3,V|>[\
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &hO-6(^I
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;aV3j/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g{Al:}u>
bf.WriteHuge(lpData,size); (^35cj{s
bf.Close(); AU3Rz&~
nCount++; [B#XA}w
} 9zb1t1[W
GlobalFreePtr(lpData); mmbe.$73
if(nCount==1) )\#*~73
m_Number.Format("%d picture captured.",nCount); h@Ea5x
else mpug#i6q
m_Number.Format("%d pictures captured.",nCount); NX,m6u
UpdateData(FALSE); v>#Njgo
} `VKFA<T
b9RHsr]V
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) )gEE7Ex?
{
C3{hf
if(pMsg -> message == WM_KEYDOWN) ?a3wBy
{ +7}^Y}(
if(pMsg -> wParam == VK_ESCAPE) rP3tFvOH
return TRUE; &U7v=a
if(pMsg -> wParam == VK_RETURN) 88~Nrl=co
return TRUE; ;ND$4$
} X7huc*
return CDialog::PreTranslateMessage(pMsg); 2+rT .GFc
} }[;ZZm?
?E"192,z@
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D[/fs`XES
{ 'EiCTl
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L@{'J
SaveBmp(); s|e.mZk/
return FALSE; ud r\\5
} U-9Aq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h(HpeN%`#
CMenu pop; x*7A33@i
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "-$}GUK?Z
CMenu*pMenu=pop.GetSubMenu(0); .Qx5,)@9
pMenu->SetDefaultItem(ID_EXITICON); M5ZH6X@5
CPoint pt; x.*^dM@V
GetCursorPos(&pt); Q38+`EhLA
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ng3ZK
if(id==ID_EXITICON) /=S@3?cQAB
DeleteIcon(); ~^1y(-cw
else if(id==ID_EXIT) UHZ&7jfl
OnCancel(); \{ @m
return FALSE; k_,7#:+
} QQS*r}>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); YWK0.F,8a
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `/PBZnj
AddIcon(); ;[}OZt
return res; %xlpOR4
}
]
#@:VR
*'-4%7C`1
void CCaptureDlg::AddIcon() <=">2WP{
{ b!]O]dk#
NOTIFYICONDATA data; (p[#[CI9
data.cbSize=sizeof(NOTIFYICONDATA); ,Q-,#C"
CString tip; l&ueD&*4&
tip.LoadString(IDS_ICONTIP); N.JR($N$
data.hIcon=GetIcon(0); ?>h
~"D#
data.hWnd=GetSafeHwnd(); ChTq !W
strcpy(data.szTip,tip); CW+kKN
data.uCallbackMessage=IDM_SHELL; Vc(4d-d5
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .D
4G;=Q
data.uID=98; x"Ky_P~
Shell_NotifyIcon(NIM_ADD,&data); 8M*+
|
ShowWindow(SW_HIDE); ~a([e\~
bTray=TRUE; ed,A'S=d
} zWC| Qe
L;RE5YrH%6
void CCaptureDlg::DeleteIcon() lg aSIXDK
{ EfEgY|V0
NOTIFYICONDATA data; eP @#I^_
data.cbSize=sizeof(NOTIFYICONDATA); [=>=5'-
data.hWnd=GetSafeHwnd(); _ p\L,No
data.uID=98; [[ie
Shell_NotifyIcon(NIM_DELETE,&data); 4u:SE
ShowWindow(SW_SHOW); }gkLO
TJ/,
SetForegroundWindow(); tn5%zJ#+
ShowWindow(SW_SHOWNORMAL); $xWwI(SaB
bTray=FALSE; ]3O&8,
} /*qRbN
t(#9.b`W)
void CCaptureDlg::OnChange() +-j-)WU?,
{ =wh[D$n$~
RegisterHotkey(); irAXXg
} 0F |t@?S
Kyh>O)"G^%
BOOL CCaptureDlg::RegisterHotkey() =\O#F88ui
{ GOc
UpdateData(); MT-Tt
UCHAR mask=0; Zk=,`sBC
UCHAR key=0; iwK.*07+
if(m_bControl) <gF]9%2E
mask|=4; k_7m[o
if(m_bAlt) *]]Zpa6
mask|=2; E{orezP
if(m_bShift) 'dKfXYY1`N
mask|=1; wb$uq/|
key=Key_Table[m_Key.GetCurSel()]; .g8*K "
if(bRegistered){ u"HGT=Nl
DeleteHotkey(GetSafeHwnd(),cKey,cMask); b(0<,r8
bRegistered=FALSE; .$&^yp
} G,)zn9X
cMask=mask; Z=]SAK`
cKey=key; zKd@Ab
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XDY]LAV
return bRegistered; 3(WijtH
} +HS]kF H
eN=jWUoCh
四、小结 3YvKHn|V"
i1B!oZ3q
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。