怎样更改EXE的主图标

function ChangeExeIcon(IcoFile, ExeFile: string): Boolean;
var
stID: ICONDIR;
stGID: GRPICONDIR;

pGrpIcon: PBYTE;
pIcon: PBYTE;
hUpdate: DWORD;
nSize, nGSize: DWORD;
hFile: THandle;
dwReserved: DWORD;
ret: Boolean;
begin
Result := False;

hFile := CreateFile(PChar(IcoFile), GENERIC_READ, 0, nil, OPEN_EXISTING,
                      FILE_ATTRIBUTE_NORMAL, 0);
if hFile = INVALID_HANDLE_VALUE then
    Exit;
try                     
    ReadFile(hFile, stID, Sizeof(ICONDIR), dwReserved, nil);
    nSize := stID.idEntries.dwBytesInRes;
    GetMem(pIcon, nSize);
    SetFilePointer(hFile, stID.idEntries.dwImageOffset, nil, FILE_BEGIN);
    ReadFile(hFile, pIcon^, nSize, dwReserved, nil);
    stGID.idType := 1;
    stGID.idCount := stID.idCount;
    stGID.idReserved := 0;
    CopyMemory(@stGID.idEntries.bWidth, @stID.idEntries.bWidth, 12);
    stGID.idEntries.nID := 0;
    nGSize := Sizeof(GRPICONDIR);
    GetMem(pGrpIcon, nGSize);
    CopyMemory(pGrpIcon, @stGID, nGSize);
    hUpdate := BeginUpdateResource(PChar(ExeFile), False);
    try
      ret := UpdateResource(hUpdate, RT_GROUP_ICON, MAKEINTRESOURCE(1), 0, pGrpIcon, nGSize);
      ret := UpdateResource(hUpdate, RT_ICON, MAKEINTRESOURCE(1), 0, pIcon, nSize);
    finally
      EndUpdateResource(hUpdate, False);
    end;
finally
    CloseHandle(hFile);
end;
Result := ret;
end;

记得type

PICONDIRENTRY = ^ICONDIRENTRY;
ICONDIRENTRY = packed record
    bWidth: Byte;
    bHeight: Byte;
    bColorCount: Byte;
    bReserved: Byte;
    wPlanes: Word;
    wBitCount: Word;
    dwBytesInRes: DWORD;
    dwImageOffset: DWORD;
end;

PICONDIR = ^ICONDIR;
ICONDIR = packed record
    idReserved: Word;
    idType: Word;
    idCount: Word;
    idEntries: ICONDIRENTRY;
end;

PGRPICONDIRENTRY = ^GRPICONDIRENTRY;
GRPICONDIRENTRY = packed record
    bWidth: Byte;
    bHeight: Byte;
    bColorCount: Byte;
    bReserved: Byte;
    wPlanes: Word;
    wBitCount: Word;
    dwBytesInRes: DWORD;
    nID: Word;
end;
PGRPICONDIR = ^GRPICONDIR;
GRPICONDIR = packed record
    idReserved: Word;
    idType: Word;
    idCount: Word;
    idEntries: GRPICONDIRENTRY;
end;

使用
ChangeExeIcon(ExtractFilePath(Paramstr(0))+'temp.ico',ExtractFilePath(Paramstr(0))+'test.exe') ;

我自己在用的。。不失真。。